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Recruitment for Postdoctoral Fellow 2027 (Fixed-term researcher)
Recruitment Field for Postdoctoral Fellow of JAEA

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No.	1
Theme	R&D on Advanced Integrated Visualization Infrastructure for Large-Scale 3D Point Cloud Data and Numerical Simulations
Department	Center for Computational Science and e-Systems (CCSE)
Section	HPC/DX Research and Development Office
Location	Kashiwa, Chiba
ContactPerson *Replace [at] with @	Takuma Kawamura Tel : +81-70-1379-4960 E-mail : kawamura.takuma[at]jaea.go.jp
Summary	CCSE has been promoting the development of visualization technologies for large-scale numerical simulations and has achieved high-precision visualization of large-scale data using the Particle-Based Volume Rendering (PBVR) method. In recent years, 3D point cloud data acquired at JAEA sites have grown in scale, and there is an increasing need to integrate point cloud data ranging from several gigabytes to several terabytes with simulation results in a unified visualization. This research will implement, within PBVR, technologies for efficiently managing and rendering large-scale point cloud data using hierarchical tree structures, etc., and will advance a visualization platform capable of jointly displaying numerical simulation results together with photo-realistic 3D point cloud data. The selected researcher will work on algorithm design, implementation, and performance evaluation toward establishing large-scale integrated visualization technologies usable across diverse fields.
Radiation Worker/ Non-RadiationWorker	Non-Radiation Worker
Field (for reference）	Measurements and Instruments Computer and Information Other

No.	2
Theme	R&D on Ensemble Computing and Visualization Environment Using AI Agents
Department	Center for Computational Science and e-Systems (CCSE)
Section	HPC/DX Research and Development Office
Location	Kashiwa, Chiba
ContactPerson *Replace [at] with @	Takuma Kawamura Tel : +81-70-1379-4960 E-mail : kawamura.takuma[at]jaea.go.jp
Summary	CCSE has been advancing CFD data assimilation research using the Ensemble Kalman Filter, where uncertainty quantification and statistical analysis derived from large-scale ensemble simulations are key challenges. Ensemble PBVR, an extension of the Particle-Based Volume Rendering method, enables statistical computation and visualization using compressed particle data without retaining the full original dataset, thereby improving computational-resource efficiency. This research will use machine learning to automate parameter setting for feature extraction and statistical visualization of ensemble data, and will develop methods that use AI agents to integrally support ensemble simulation and visualization workflows. The selected researcher will work on algorithm design, implementation, and validation toward establishing a next-generation ensemble analysis platform that integrates analysis, AI, and visualization.
Radiation Worker/ Non-RadiationWorker	Non-Radiation Worker
Field (for reference）	Computer and Information Other

No.	3
Theme	R&D on Gas-Liquid Two-Phase Flow Analysis
Department	Center for Computational Science and e-Systems (CCSE)
Section	HPC/DX Research and Development Office
Location	Kashiwa, Chiba
ContactPerson *Replace [at] with @	Kenta Sugihara Tel : +81-80-9183-8174 E-mail : sugihara.kenta[at]jaea.go.jp
Summary	CCSE has been developing an interface-capturing gas-liquid two-phase flow analysis code and conducting research on thermal-hydraulic phenomena related to safety evaluation of light-water reactors and design of fast reactors. The above analyses require high-resolution simulations leveraging state-of-the-art GPU supercomputers, and advanced modeling that incorporates both the physical models of gas-liquid interfaces and turbulence phenomena and the computer-science knowledge of cutting-edge GPUs is essential. The selected researcher will engage in R&D on this theme and advance gas-liquid two-phase flow analysis.
Radiation Worker/ Non-RadiationWorker	Non-Radiation Worker
Field (for reference）	Physics Mechanics Applied Physics Computer and Information

No.	4
Theme	R&D conserning Fukushima environmental remediation utilizing techniques such as sparse-modeling and air-dose simulation
Department	Center for Computational Science and e-Systems (CCSE)
Section	AI/DX Research and Development Office
Location	Kashiwa, Chiba
ContactPerson *Replace [at] with @	Mitsuhiro Itakura Tel : +81-80-9668-6997 E-mail : itakura.mitsuhiro[at]jaea.go.jp
Summary	CCSE is conducting R&D of Fukushima environmental remediation issues, using sparse modeling and Bayesian optimization to estimate radiation source distributions from air-dose distribution, and air-dose calculation utilizing detailed model of terrain and buildings. Applicant will conduct research on estimation of radiation source distribution inside Fukushima Daiichi NPP, and detailed estimation of air-dose distribution around and inside buildings in Fukushima area. Applicant is also supposed to communicate with researchers (especially experimentalists ) of JAEA and other institutes closely to share research problems and issues.
Radiation Worker/ Non-RadiationWorker	Non-Radiation Worker
Field (for reference）	Computer and Information Geo and Environemtal Sciences Biology Radiation Physics

No.	5
Theme	R&D of techniques for matelials simulation utilizing first-principles calculation and machine learning
Department	Center for Computational Science and e-Systems (CCSE)
Section	AI/DX Research and Development Office
Location	Kashiwa, Chiba
ContactPerson *Replace [at] with @	Mitsuhiro Itakura Tel : +81-80-9668-6997 E-mail : itakura.mitsuhiro[at]jaea.go.jp
Summary	CCSE is conducting R&D aimed at achieving an advanced understanding of the properties of nuclear fuels and structural materials in the nuclear field. This work utilizes first-principles calculations and machine-learning-based molecular dynamics simulations. In particular, CCSE is developing an analysis framework based on quantum mechanical calculations and large-scale simulations to enable high-accuracy prediction of phenomena such as defect generation and diffusion induced by radiation irradiation, as well as high-temperature thermophysical properties of fuel materials. Applicant will engage in research and development on high-precision evaluation of fuel and material properties using first-principles calculations, large-scale molecular dynamics simulations employing machine-learning potentials, and the advancement of integrated methodologies for predicting the behavior of nuclear fuels and materials.
Radiation Worker/ Non-RadiationWorker	Non-Radiation Worker
Field (for reference）	Computer and Information Physics Material Geo and Environemtal Sciences Mechanics

No.	6
Theme	Research and development of nuclear material detection and measurement for nuclear non-proliferation and nuclear security
Department	Integrated Support Center for Nuclear Nonproliferation, Security and Human Resource Development (ISCN)
Section	Technology Development Promotion Office
Location	Nuclear Science Research Institute
ContactPerson *Replace [at] with @	Name: Tomita Yutaka Tel : +81-80-9716-3767 E-mail : tomita.yutaka[at]jaea.go.jp
Summary	Aiming to realize a world free from the threat of nuclear weapons and nuclear terrorism, ISCN collaborates with international partners to develop technologies in the fields of nuclear non-proliferation (IAEA safeguards) and nuclear security. As part of our contribution to advancing future technologies in these areas, we are working to strengthen nuclear non-proliferation systems through the development of active neutron measurement technology, a non-destructive technique that enables the detection and quantification of nuclear materials, even in the presence of fission products. We are also contributing to the prevention of nuclear terrorism through the development of gamma-ray and neutron imaging technologies, which support effective response in the event of a nuclear terrorism incident involving the dispersal of nuclear materials. This position involves conducting surveys on the latest research related to neutron sources, gamma-ray detectors, and other relevant technologies, as well as performing simulations, data analysis, and equipment development.
Radiation Worker/ Non-RadiationWorker	Radiation Worker
Field (for reference）	Applied Physics Applied Chemistry Radiation Measurements and Instruments Computer and Information Robotics Other

No.	7
Theme	Research and development in nuclear forensics for nuclear non-proliferation and nuclear security
Department	Integrated Support Center for Nuclear Nonproliferation, Security and Human Resource Development (ISCN)
Section	Technology Development Promotion Office
Location	Nuclear Science Research Institute
ContactPerson *Replace [at] with @	Name: Tomita Yutaka Tel : +81-80-9716-3767 E-mail : tomita.yutaka[at]jaea.go.jp
Summary	Aiming to realize a world free from the threat of nuclear weapons and nuclear terrorism, ISCN collaborates with international partners to develop technologies in the fields of nuclear non-proliferation (IAEA safeguards) and nuclear security. Nuclear forensics involves the analysis of the physical and chemical characteristics of nuclear materials (such as uranium and plutonium) and radioactive materials that have been lost, smuggled, stolen, or seized—such as from the scene of a terrorist act—in order to determine their origin, history, intended use, and to support law enforcement and investigative activities. As a member of the nuclear forensics team, the successful candidate will be responsible for one or more of the following tasks: isotope analysis; chemical analysis, including radiometric dating to determine when the material was refined; radiation measurement; morphological analysis using electron microscopy; data analysis; and the development of analytical equipment. The position also offers opportunities to participate in collaborative research with domestic institutions, international partners, and the IAEA, as well as in table-top exercises based on nuclear terrorism scenarios.
Radiation Worker/ Non-RadiationWorker	Radiation Worker
Field (for reference）	Applied Physics Applied Chemistry Geo and Environemtal Sciences Radiation Measurements and Instruments Computer and Information Other

No.	8
Theme	Policy research in the fields of nuclear non-proliferation and nuclear security
Department	Integrated Support Center for Nuclear Nonproliferation, Security and Human Resource Development (ISCN)
Section	Strategy and Coordination Office
Location	Head Office
ContactPerson *Replace [at] with @	Taro　Takashi Kimura Tel : +81-70-1393-6049 E-mail : kimura.takashi91[at]jaea.go.jp
Summary	ISCN aims to realize a world free of nuclear weapons and nuclear terrorism. We work collaboratively as a team to engage in technology development and cooperation, capacity-building support, and policy research, in partnership with international organizations in the fields of nuclear non-proliferation (IAEA safeguards), nuclear security, and nuclear disarmament. The selected candidate will contribute to policy development through research on nuclear non-proliferation and nuclear security ,combining technical knowledge with insights from international law and the social sciences. The role also involves supporting the JAEA's international strategy by identifying needs for human resource development and technical assistance in Asian region. This includes conducting policy research and analysis, giving presentations to promote broader understanding, and working together with think tanks and related institutions throughout Asia.
Radiation Worker/ Non-RadiationWorker	Non-Radiation Worker
Field (for reference）	Geo and Environemtal Sciences Radiation Computer and Information Applied Physics Applied Chemistry Other

No.	9
Theme	Research on Evaluation Methods for Aerosols and Microparticles toward the Decommissioning of the Fukushima Daiichi Nuclear Power Station
Department	Collaborative Laboratories for Advanced Decommissioning Science (CLADS)
Section	Decommissioning Evaluation Group
Location	Tokai (NSRI)
ContactPerson *Replace [at] with @	Toru Kitagaki Tel : +81-29-282-6810 E-mail : kitagaki.toru[at]jaea.go.jp
Summary	This position involves R&D to advance evaluation methods for radioactive aerosols and microparticles, essential for full-scale fuel debris retrieval at the Fukushima Daiichi Nuclear Power Station (1F). To assess complex particle behavior, the scope spans from multiphysics aerosol measurements (characterizing size-specific radioactivity and composition) to developing on-site evaluation instruments. This includes designing and prototyping fluid dynamics-based classification devices and their integrated performance evaluation with measurement systems. These activities align with national projects and international discussions (e.g., OECD/NEA). Through this role, the researcher will acquire comprehensive expertise from fundamental particle science to applied decommissioning technologies, cultivating the international perspective and project management skills needed to lead future R&D in this field.
Radiation Worker/ Non-RadiationWorker	Radiation Worker
Field (for reference）	Mechanics Geo and Environemtal Sciences Measurements and Instruments Biology Electricity and Electronics Computer and Information Radiation

No.	10
Theme	Study on fuel behavior during accidents
Department	Nuclear Safety Research Center
Section	Fuel Safety Research Group
Location	Tokai
ContactPerson *Replace [at] with @	Kazuo Kakiuchi Tel : +81-29-282-6230 E-mail : kakiuchi.kazuo[at]jaea.go.jp
Summary	Currently, research and development of Accident Trelance Fuels/Advanced Technology Fuels (ATFs), which are expected to improve the safety of light water reactors by delaying high-temperature oxidation reactions and core melting during accidents, is actively being conducted. Understanding phenomena such as fuel failure behavior and fuel debris properties during severe accidents is crucial for their development. Therefore, this study aims to support fuel safety evaluations of such as ATFs through experimental and analytical studies on fuel behavior during accidents in light water reactors, as described below. ・Accidental behavior of ATFs/existing fuels (cladding swelling/rupture, relocatoin within fuel rod, acquisition of basic physical properties under high temperatures, fission gas release, source term, etc.) • Advancement of analytical technology (development of probabilistic fuel behavior analysis models, integration of fuel behavior analysis codes/thermohydraulic codes/severe accident analysis codes, etc.) • Evaluation of fuel and core cooling performance during and after accidents
Radiation Worker/ Non-RadiationWorker	Non-Radiation Worker
Field (for reference）	Physics Chemistry Applied Physics Applied Chemistry Measurements and Instruments Material Mechanics

No.	11
Theme	Study on improvement of severe accident evaluation techniques
Department	Nuclear Safety Research Center
Section	Severe Accident Research Group
Location	Tokai
ContactPerson *Replace [at] with @	Yutaka Udagawa Tel : +81-29-282-5253 E-mail : udagawa.yutaka[at]jaea.go.jp
Summary	The research and development will be performed to evaluate the plant response, accident progression, and migration/release behavior of radionuclides during severe accidents, including the effects of countermeasures by accident management. Specifically, the R&D is related to the followings, - Probability Risk Assessment (PRA): the research on Level 1 PRA using thermal-hydraulic system code, Level 2 PRA including source term evaluation using integrated severe accident analysis code, and advanced PRA method (e.g. DPRA) across Level 2/3 and their uncertainty evaluation. - Development of integrated severe accident analysis code (SA code): support the development of SA code to evaluate the accident progression and source term. It includes the overall design of the code, design and programming of analysis modules, investigation of existing SA code, and documentation.
Radiation Worker/ Non-RadiationWorker	Non-Radiation Worker
Field (for reference）	Physics Chemistry Mechanics Geo and Environemtal Sciences Computer and Information Other

No.	12
Theme	Study on methodology of accident consequence analysis and its application to the protection of people living in affected areas after a Nuclear Accident
Department	Nuclear Safety Research Cener
Section	Risk Analysis Research Group
Location	Tokai
ContactPerson *Replace [at] with @	Kentaro Manabe Tel : +81-29-282-6149 E-mail : manabe.kentaro[at]jaea.go.jp
Summary	The aim of this study is to develop the assessment methods of consequences due to a Nuclear Accident, and also application to the protection of people living in affected areas after the accident. To achieve this aim, one of the following tasks or other related tasks will be made： ①Development of accident consequence assessement methods including radiation dose assessement and social-econical impacts analysis; ②Development of calculation codes which are implemented latest methods related to consequence assessments, and of a level 3 PRA code OSCAAR; ③Optimization of nuclear emergency preparedness by using a level 3PRA code OSCAAR; ④Research on public understanding and behavior, and public communication in nuclear emergency preparedness.
Radiation Worker/ Non-RadiationWorker	Non-Radiation Worker
Field (for reference）	Physics Geo and Environemtal Sciences Chemistry Mathematics Radiation Other

No.	13
Theme	Study on Materials Degradation Evaluation and Structural Integrity Assessment for Nuclear Rector Components
Department	Nuclear Safety Research Center
Section	Ageing Management Research Group
Location	Tokai
ContactPerson *Replace [at] with @	Takeshi Toyama Tel : +81-29-282-5044 E-mail : toyama.takeshi[at]jaea.go.jp
Summary	The long-term operation of existing light water reactors is required from the perspective of enhancing domestic energy security and supporting the economic foundation. To ensure the integrity of safety-critical components during the long-term operation, it is essential to improve the accuracy of degradation predictions for the materials that make up these components. This study focuses primarily on primary pressure boundary components, such as reactor pressure vessels and piping, which are critical for safety. By conducting experimental research—such as microstructural analysis and fracture toughness evaluation of materials, evaluation of stress corrosion cracking initiation and propagation, and non-destructive testing—and analytical studies such as numerical simulations, the research investigates the effects of reactor-specific environments. Furthermore, efforts will be made to develop and improve evaluation methods for material degradation and structural integrity. Non-destructive testing research such as ultrasonic testing will also be involved.
Radiation Worker/ Non-RadiationWorker	Radiation Worker
Field (for reference）	Mechanics Material Measurements and Instruments Computer and Information Physics Applied Physics

No.	14
Theme	Study on the methodology of seismic safety, structural integrity assessment and probabilistic seismic hazard analysis for nuclear buildings and components
Department	Nuclear Safety Research Center
Section	Seismic Safety and Structural Integrity Research Group
Location	Tokai
ContactPerson *Replace [at] with @	Tatsuya Itoi Tel : +81-29-282-5324 E-mail : itoi.tatsuya[at]jaea.go.jp
Summary	Based on the occurrence of major earthquakes beyond the conventional designed seismic ground motion in recent years, and the regulations for the impact assessment of projectiles collisions under the new regulatory standards, etc., developing the methodologies of seismic safety and structural integrity assessments for the building, reactor components and piping is of great importance. In this theme, one of the following related researches will be conducted. - Advanced seismic safety assessment research including development of three-dimensional evaluation models of nuclear facility buildings, components and piping systems, and numerical simulation considering nonlinear mechanical properties, and fragility evaluation method for seismic risk assessment, - Research and development on impact assessment methods for buildings and internal components due to projectile collision. - Research and development on probabilistic seismic hazard analysis and probabilistic seismic risk assessment
Radiation Worker/ Non-RadiationWorker	Non-Radiation Worker
Field (for reference）	Mechanics Architectural and CivilEngineering Material Physics Applied Physics Measurements and Instruments Computer and Information

No.	15
Theme	Study on release and transport behavior of radioactive materials in reprocessing plant under severe accident conditions
Department	Nuclear Safety Research Center
Section	Severe Accident Research Group
Location	Tokai
ContactPerson *Replace [at] with @	Yutaka Udagawa Tel : +81-29-282-5253 E-mail : udagawa.yutaka[at]jaea.go.jp
Summary	At fuel reprocessing plant, there are concerns about the occurrence of serious accidents such as boiling and exsiccation of highly-active liquid waste in concentrators as well as fire accidents in cell, and establishment of method for evaluating their effect on the public dose and effectiveness of countermeasures for the accidents become an urgent issue. Purposes of this study are 1) acquiring data about release, transport and confinement of radioactive materials under the accident conditions and 2) establishing a simulation code to evaluate the accident evolution with high applicability.
Radiation Worker/ Non-RadiationWorker	Non-Radiation Worker
Field (for reference）	Chemistry Chemical Engineering Computer and Information

No.	16
Theme	Research on the optimization of evaluation methods for nuclear criticality safety reference values (estimated lower limit multiplication factor and upper subcriticality level)
Department	Nuclear Safety Research Center
Section	Criticality Safety Research Group
Location	Tokai
ContactPerson *Replace [at] with @	Satoshi　Gunji Tel : +81-29-282-6634 E-mail : gunji.satoshi74[at]jaea.go.jp
Summary	Regarding the evaluation method for nuclear criticality safety standards in Japan (estimated lower limit multiplication factor and upper subcriticality level), the Criticality Safety Handbook adopts a statistical evaluation method based on the calculation results of criticality experiment benchmarks. In the approximately 20 years since then, there has been little research or effort regarding the development of evaluation methods. On the other hand, there are many ocerseas research on this evaluation methods such as methods that take into account various uncertainties in nuclear data that serve as computation inputs, and evaluation of the representativity factor based on the analysis of correlation coefficient. Therefore, the applicant will extensively investigate and analyze the evaluation methods currently being proposed in Japan and overseas, and clarify the advantages and disadvantages of the representative methods according to the applicable targets and conditions in this study. The goal of this study is to consider robust evaluation methods that be widely applyed.
Radiation Worker/ Non-RadiationWorker	Radiation Worker
Field (for reference）	Physics Computer and Information Applied Physics Mechanics Measurements and Instruments Other

No.	17
Theme	Research on radiation measurement technology that contributes to criticality safety management of fuel debris
Department	Nuclear Safety Research Center
Section	Criticality Safety Research Group
Location	Tokai
ContactPerson *Replace [at] with @	Satoshi　Gunji Tel : +81-29-282-6634 E-mail : gunji.satoshi74[at]jaea.go.jp
Summary	In the event of a reactor core meltdown caused by a severe accident, using radiation measurement techniques, such as neutron measurements, to confirm the location, properties, and subcritical state of the molten fuel (fuel debris) during processing and retrieval would help reduce the risk of worker exposure and environmental impact during these operations. On the other hand, the radiation measurement environment and conditions inside the broken pressure vessel and containment vessel are expected to be extremely severe. Therefore, we will explore the development of measurement conditions and signal processing methods to estimate the location, properties, and subcritical state of the molten fuel by utilizing experiments conducted in a criticality experimental apparatus that simulates the measurement environment. *We do not intend to develop hardware related to experimental measurements.
Radiation Worker/ Non-RadiationWorker
Field (for reference）	Radiation Measurements and Instruments Computer and Information Physics Electricity and Electronics Applied Physics Other

No.	18
Theme	Study on safeguards analytical techniques for individual particles containing nuclear materials in environmental samples
Department	Nuclear Safety Research Center
Section	Safeguards Analytical Chemistry Research Group
Location	Tokai
ContactPerson *Replace [at] with @	Kenichiro YASUDA Tel : +81-29-284-3668 E-mail : yasuda.kenichiro[at]jaea.go.jp
Summary	Analysis of nuclear materials of ultra-trace amouts in environmental samples taken at nuclear facilities in the world is performed to reveal nuclear activities, which is important technique for nuclear safeguards. In this study, ultra-trace analysis for measuring isotopic composition and/or chemical states of nuclear materials in a nuclear particle are developed using several mass spectrometer (ICP-MS, TIMS and SIMS) and micro-Raman spectrometer.
Radiation Worker/ Non-RadiationWorker	Radiation Worker
Field (for reference）	Applied Physics Applied Chemistry Measurements and Instruments

No.	19
Theme	Development and Application of Functional Materials Based on Soil Clay Minerals for Sustainable Resource Utilization
Department	Honda's Lab for Development of Future Clay Materials Research
Section
Location	Tokai(NSRI)
ContactPerson *Replace [at] with @	Mitsunori Honda Tel : +81-29-282-5832 E-mail : honda.mitsunori[at]jaea.go.jp
Summary	We are exploring the potential of environmentally friendly soil clay minerals to achieve energy self-sufficiency and carbon neutrality that modern society faces. In this research theme, we will develop new functional materials utilizing soil clay minerals by making full use of our original molten salt method. Specifically, we will research and develop thermoelectric conversion materials, thermoelectric modules, and humidity sensor materials using soil clay minerals as raw materials. In this process, we will synthesize a variety of crystals using the molten salt method and perform detailed analysis of the crystalline materials obtained by the following methods: X-ray fluorescence analysis, X-ray diffraction analysis, synchrotron radiation X-ray analysis and infrared absorption spectrum analysis, and density analysis. In addition, we characterize the obtained materials and promote the following research and development Thermoelectric property evaluation and fabrication and evaluation of thermoelectric modules, and correlation analysis between structure and properties through evaluation of specific surface area and pore distribution. Through these studies, we aim to establish fundamental technologies to reduce the environmental impact and contribute to the construction of a sustainable society.
Radiation Worker/ Non-RadiationWorker	Radiation Worker
Field (for reference）	Material Applied Physics Chemistry Geo and Environemtal Sciences

No.	20
Theme	Research on the creation of novel electronics technologies based on condensed matter physics
Department	Nuclear Science Research InstitutePioneer Laboratory
Section	Kikkawa's Lab for Development of Novel Electronic Functionalities
Location	Tokai (Nuclear Science Research Institute)
ContactPerson *Replace [at] with @	Takashi　Kikkawa Tel : +81-29-284-3527 E-mail : kikkawa.takashi[at]jaea.go.jp
Summary	We aim to create novel electronics technologies by integrating phenomena in solid-state physics—primarily the magnetic and dielectric properties of materials—with electrical-circuit and measurement technologies. From both scientific and engineering perspectives, we will actively pursue not only the publication of research results and presentations at academic conferences, but also the filing of patents for practical applications. This year, the core focus will be on the research and development of magnetic and dielectric passive devices based on new principles. However, the research topics will be determined in consultation with the successful candidate. While prior experience in research and development related to the above keywords is desirable, we welcome motivated early-career researchers who can work proactively, regardless of their previous background or area of specialization. Regarding the past research of the PI of this project, please refer to the URL (https://researchmap.jp/TakashiKikkawa/?lang=en). Inquiries are also welcome.
Radiation Worker/ Non-RadiationWorker	Non-Radiation Worker
Field (for reference）	Physics Applied Physics Material Electricity and Electronics Measurements and Instruments

No.	21
Theme	Research on exotic heavy-element nuclear science
Department	Nuclear Science Research Institute, Advanced Science Reserch Center
Section	Research Group for Exotic Heavy-element Nuclear Science
Location	Nuclear Science Research Institute
ContactPerson *Replace [at] with @	Dr. Katsuhisa Nishio Tel : +81-29-282-5454 E-mail : nishio.katsuhisa[at]jaea.go.jp
Summary	Experimental and theoretical studies of nuclear physics in the region of heavy and superheavy elements will be promoted. The subjects include nucler structure, nuclear reaction, and nuclear fission for nuclei far from the stable isotopes to find out new phenomena and new principle in exotic nuclei. These subjects are also studied theoretically by taking advantage of the JAEA supercomputer. In the experimental programs, JAEA facilities and/or other external facilities will be used to produce exotic nuclei. ( https://asrc.jaea.go.jp/soshiki/gr/HENS-gr/index_e.html )
Radiation Worker/ Non-RadiationWorker	Radiation Worker
Field (for reference）	Physics Chemistry Electricity and Electronics Applied Physics Measurements and Instruments Computer and Information Other

No.	22
Theme	Experimental research for hadron and nuclear physics at J-PARC
Department	Nuclear Science Research Institute, Advanced Science Reserch Center
Section	Research Group for Hadron Nuclear Physics
Location	Nuclear Science Research Institute
ContactPerson *Replace [at] with @	Hiroyuki Sako Tel : +81-29-284-3828 E-mail : sako.hiroyuki[at]jaea.go.jp
Summary	The successful candidates will work on hadron nuclear experimental research either at J-PARC Hadron Experimental Facility, J-PARC Heavy-Ion Project (J-PARC-HI), RHIC, or Belle (II), which are promoted by our group.
Radiation Worker/ Non-RadiationWorker	Radiation Worker
Field (for reference）	Physics

No.	23
Theme	Research on Quantum Physics of Strongly Correlated Electron Systems
Department	Nuclear Science Research Institute, Advanced Science Reserch Center
Section	Research Group for Strongly Correlated Actinide Science
Location	Nuclear Science Research Institute
ContactPerson *Replace [at] with @	Yo Tokunaga Tel : +81-29-284-3525 E-mail : tokunaga.yo[at]jaea.go.jp
Summary	We conduct research on novel quantum phenomena in strongly correlated electron systems, including spin-triplet superconductivity and nonreciprocal transport. Our experimental approach involves the complementary use of various techniques based on specific research themes, such as material synthesis, magnetic and transport property measurements, nuclear magnetic resonance (NMR), neutron scattering, muon spin relaxation (μSR), and resonant X-ray diffraction. Furthermore, we utilize advanced microfabrication via focused ion beam (FIB) technology. We also actively promote international collaborations.
Radiation Worker/ Non-RadiationWorker	Radiation Worker
Field (for reference）	Physics Material Applied Physics Chemistry

No.	24
Theme	Study of spin-related physics in condensed matter systems
Department	Nuclear Science Research Institute, Advanced Science Reserch Center
Section	Research Group for Spin-energy Science
Location	Tokai (Nuclear Science Reserch Institute)
ContactPerson *Replace [at] with @	Jun'ichi Ieda Tel : +81-29-284-3449 E-mail : ieda.junichi[at]jaea.go.jp
Summary	Our group studies spintronics, magnonics, gyromagnetic effect, strong correlation effect, topological properties, and other physical properties stemming from spin in condensed matter systems both experimentally and theoretically. We welcome a wide range of candidates who are interested in fields related to magnetism and spintronics and who are willing to pursue the physics of spin. For specific research themes, please refer to the publication list (https://asrc.jaea.go.jp/soshiki/gr/spinenergy/publications.html), and inquiries are accepted at any time.
Radiation Worker/ Non-RadiationWorker	Non-Radiation Worker
Field (for reference）	Physics Applied Physics Material Computer and Information

No.	25
Theme	Study of condensed matter science and energy science
Department	Nuclear Science Research Institute, Advanced Science Reserch Center
Section	Research Group for Spin-energy ScienceResearch Team for Advanced Energy Materials
Location	Tokai (Nuclear Science Reserch Institute)
ContactPerson *Replace [at] with @	Takashi　Kikkawa Tel : +81-29-284-3527 E-mail : kikkawa.takashi[at]jaea.go.jp
Summary	We conduct research related to condensed matter physics and energy science, aiming to pioneer new technologies for energy conversion, storage, and control. We value the candidate’s originality and approach, and welcome applications that bring new perspectives. The research topics will be determined in consultation with the successful candidate. Motivated early-career researchers who can work proactively are encouraged to apply, regardless of their prior experience or area of specialization (applicants without a background in solid-state or condensed matter physics are also welcome). Regarding the past research of the PI of this project, please refer to the URL (https://researchmap.jp/TakashiKikkawa/?lang=en). Inquiries are also welcome.
Radiation Worker/ Non-RadiationWorker	Non-Radiation Worker
Field (for reference）	Physics Applied Physics Material Electricity and Electronics

No.	26
Theme	Study on Surface/Interface and Low-Dimensional Materials
Department	Nuclear Science Research Institute, Advanced Science Reserch Center
Section	Research Group for Surface and Interface Science
Location	Nuclear Science Research Institute
ContactPerson *Replace [at] with @	Yuki Fukaya Tel : +81-29-282-6582 E-mail : fukaya.yuki99[at]jaea.go.jp
Summary	The research theme is focused on low-dimensional materials such as surface/interface structures and two-dimensional materials. By using surface and/or solid/liquid interface analysis techniques, atomic arrangements and electronic states of low-dimensional materials are investigated towards the development of new functional materials such as electrode catalysts for fuel cells and carbon recycling and hydrogen functional materials. Molecular beam epitaxy (MBE), chemical vapor deposition (CVD), atomic force microscopy (AFM), scanning tunneling microscopy (STM), Raman spectroscopy, electrochemical analysis, reflection high-energy electron diffraction (RHEED), positron diffraction, photoelectron spectroscopy, and first-principles calculations are available.
Radiation Worker/ Non-RadiationWorker	Radiation Worker
Field (for reference）	Physics Chemistry Material Applied Physics Applied Chemistry Measurements and Instruments

No.	27
Theme	Research of Materials Science by using Muon
Department	Nuclear Science Research Institute, Advanced Science Reserch Center
Section	Research Group for Surface and Interface Science
Location	Nuclear Science Research Institute
ContactPerson *Replace [at] with @	Wataru　Higemoto Tel : +81-29-284-3873 E-mail : higemoto.wataru[at]jaea.go.jp
Summary	We recruit researchers who promote research on materials science by using muons, produced by accelerators. Muons, one of the elementary particles, are widely used in materials research, such as to investigate the local magnetic field inside matter with ultra-high sensitivity, or the state and dynamics of hydrogen. In this research subject, by using advanced muon or other beam, applicants investigate properties of materials, such as elucidating the local spin and electronic state, or hydrogen state of materials. An experience of muon or other beam experiment does not be required.
Radiation Worker/ Non-RadiationWorker	Radiation Worker
Field (for reference）	Physics Material Chemistry Applied Physics Applied Chemistry Measurements and Instruments

No.	28
Theme	Development of highly durable functional materials
Department	Nuclear Science Research Institute, Advanced Science Reserch Center
Section	Research Group for Sustainable Functional Materials Sciences
Location	Nuclear Science Research Institute
ContactPerson *Replace [at] with @	Kazuya Tanaka Tel : +81-29-284-3518 E-mail : tanaka.kazuya[at]jaea.go.jp
Summary	This theme intends to perform basic and applied reserch on the development of functional (e.g. magnetic, optical, mechanical, and/or electrochemical) materials with high durability/resistivity against harsh conditions (e.g. radiation, heat, corrosion, etc.). Energy storage materials with high environmental-durability is also a potential scope of this theme.
Radiation Worker/ Non-RadiationWorker	Radiation Worker
Field (for reference）	Material Applied Physics Applied Chemistry

No.	29
Theme	Theoretical study of many-body quantum systems
Department	Nuclear Science Research Institute, Advanced Science Reserch Center
Section
Location	Nuclear Science Research Institute
ContactPerson *Replace [at] with @	Yutaka Utsuno Tel : +81-29-282-6901 E-mail : utsuno.yutaka[at]jaea.go.jp
Summary	The candidates will promote theoretical researches on nuclear (including hadron) sciences and/or materials (or condensed-matter) sciences that are conducted in the Advanced Science Research Center (ASRC). The Theoretical Research Cluster, a virtual organization comprised of theoretical members in ASRC, aims at exploring novel directions of theoretical physics by exchanging ideas of nuclear and materials fields. We expect applications of researchers who will drive theoretical studies along with this concept. The candidates will be affiliated with one of the six groups in ASRC, if adopted, based on compatibility.
Radiation Worker/ Non-RadiationWorker	Non-Radiation Worker
Field (for reference）	Physics

No.	30
Theme	Development of next-generation radiation instrumentation and its practical deployment
Department	Nuclear Science and Engineering Center
Section	Research Group for Nuclear Sensing
Location	Nuclear Science Research Institute
ContactPerson *Replace [at] with @	Yosuke Toh Tel : +81-29-282-6211 E-mail : toh.yosuke[at]jaea.go.jp
Summary	This research theme focuses on the development of radiation measurement technologies for gamma rays, neutrons, and other particles. It covers a wide range of applications, including decommissioning, nuclear security, radiation medicine, and natural sciences. We highly value the candidate's creative ideas and flexible approaches, welcoming challenges from fresh perspectives. We encourage applications from motivated young researchers who are eager to take initiative and work proactively on this theme. Prior experience or a specific background in this field is not a prerequisite, provided the candidate demonstrates strong enthusiasm and a commitment to research excellence.
Radiation Worker/ Non-RadiationWorker	Radiation Worker
Field (for reference）	Radiation Measurements and Instruments Physics Chemistry Applied Physics Applied Chemistry Other

No.	31
Theme	Improvement of the Particle and Heavy Ion Transport code System PHITS and its applications to life, material, medical, and space sciences
Department	Nuclear Science and Engineering Center
Section	Research Group for Radiation Transport Analysis
Location	Nuclear Science Research Institute
ContactPerson *Replace [at] with @	Tatsuhiko Sato Tel : +81-29-282-5803 E-mail : sato.tatsuhiko[at]jaea.go.jp
Summary	Particle and Heavy Ion Transport code System (PHITS) is a multi-purpose Monte Carlo particle transport simulation code developed in JAEA. This study is dedicated to improving PHITS and extending its application fields to various research areas such as life, material, medical, and space sciences. We look forward to innovative proposals from young researchers.
Radiation Worker/ Non-RadiationWorker	Non-Radiation Worker
Field (for reference）	Applied Physics Computer and Information Radiation Biology Physics Chemistry

No.	32
Theme	Research on material transfer in the land-surface environment
Department	Nuclear Science and Engineering Center
Section	Research Group for Environmental Science
Location	Nuclear Science Research Institute
ContactPerson *Replace [at] with @	Masakazu Ota Tel : +81-29-5570 E-mail : ohta.masakazu[at]jaea.go.jp
Summary	Our group is developing numerical simulation models to calculate the transfer of radionuclides or other substances in the various environments, including the atmosphere, land, and sea. The goal of this research theme is deriving new scienctific insights on land-surface processes, by using the SOLVEG model, which calculates the transfer of substances on the land surface, to perform simulations of the transfer of radioactive materials (cesium-137, iodine-129, tritium, carbon-14, etc.) and general environmental substances (carbon) between the atmosphere, vegetation, and soil. When selecting a specific theme, the candidate's preferences and expertise will be considered.
Radiation Worker/ Non-RadiationWorker	Non-Radiation Worker
Field (for reference）	Geo and Environemtal Sciences

No.	33
Theme	Comprehensive experimental and theoretical fundamentals, as well as chemical engineering application studies, on solvent extraction processes considering interfacial phenomena
Department	Nuclear Science and Engineering Center
Section	Research Group for Nuclear Chemistry
Location	Nuclear Science Research Institute
ContactPerson *Replace [at] with @	Ryoji Kusaka Tel : +81-29-282-5788 E-mail : kusaka.ryoji[at]jaea.go.jp
Summary	Although the oil–water interface in solvent extraction plays a crucial role—such as enabling the transport of metal ions—the chemical reactions occurring there remain insufficiently understood, and optimization of processes that properly account for interfacial reactions has not yet been achieved. This study aims to advance solvent extraction by integrating interfacial experimental and theoretical approaches, including vibrational sum frequency generation (VSFG) spectroscopy and molecular dynamics (MD) simulations to elucidate molecular-scale interfacial chemical states, with batch tests for evaluating extraction efficiency and separation factors, bulk phase analyses, organic synthesis of extractants, and machine learning–based prediction of optimal reagents; the primary target metals are lanthanides and actinides, and the work further extends to chemical engineering studies using a small-scale mixer–settler system.
Radiation Worker/ Non-RadiationWorker	Radiation Worker
Field (for reference）	Chemistry Physics Radiation Measurements and Instruments Chemical Engineering

No.	34
Theme	Research and Development on Nuclear Data
Department	Research Center for LWR Engineering
Section	Research Group for Nuclear and Reactor Engineering
Location	Nuclear Science Research Institute
ContactPerson *Replace [at] with @	Atsuchi Kimura Tel : +81-29-282-5796 E-mail : kimura.atsushi04[at]jaea.go.jp
Summary	To contribute to the development of nuclear energy and various applications of radiation toward a sustainable society, our group conducts research on nuclear data related to nuclear reactions and nuclear decay. We are engaged in the development of the Japanese Evaluated Nuclear Data Library (JENDL), which provides fundamental data for nuclear energy utilization, radiation applications, medical uses, space development, and radiation protection. For the development of the nuclear data library JENDL, applicants can select research topics of (1) study on nuclear data measurement using facilities in J-PARC and others, (2) theoretical study on nuclear reaction and structure, (3) study on nuclear data evaluation for the nuclear data library development. (Work on radiation or non-radiation, depending on the selected topic.) （https://wwwndc.jaea.go.jp/jendl/jendl.html）
Radiation Worker/ Non-RadiationWorker	Radiation Worker
Field (for reference）	Physics Radiation Measurements and Instruments

No.	35
Theme	Research and Development on Advanced Neutronics/Thermal-Hydraulics Coupled Analysis
Department	Research Center for LWR Engineering
Section	Research Group for Nuclear and Reactor Engineering
Location	Nuclear Science Research Institute
ContactPerson *Replace [at] with @	Kenichi Tada Tel : +81-29-284-3952 E-mail : tada.kenichi[at]jaea.go.jp
Summary	Our research group is developing JAMPAN, a multiphysics platform that couples the continuous-energy Monte Carlo neutron transport code MVP with the CFD codes JUPITER and ACE-3D, aiming to achieve high-accuracy reactor design. Using JAMPAN, we have successfully performed full-core nuclear–thermal coupled analyses for BWRs and PWRs, as well as detailed nuclear–thermal coupled analyses of a single BWR fuel assembly, in which boiling phenomena within the assembly are explicitly treated. These analyses represent highly detailed multiphysics simulations that were not achievable with conventional analysis methods, and the outcomes of this research have attracted significant international attention. However, in order to perform high-fidelity multiphysics analyses capable of serving as an alternative to mockup experiments, further improvements are essential, including enhancements in the accuracy of neutronics and thermal–hydraulics calculations, the addition of new modeling capabilities, computational acceleration, and overall refinement of the JAMPAN platform. In this research project, we will address these challenges with the goal of realizing advanced, high-resolution multiphysics analyses. (https://rpg.jaea.go.jp/main/en/program_jampan/)
Radiation Worker/ Non-RadiationWorker	Non-Radiation Worker
Field (for reference）	Physics Mathematics Radiation Mechanics Computer and Information

No.	36
Theme	Research and Development on Advancing Numerical Methods for High‑Accuracy Analysis of Gas–Liquid Two‑Phase Flows and Experimental Validation of Interfacial Behavior
Department	Research Center for LWR Engineering
Section	Research Group for Nuclear and Reactor Engineering
Location	Nuclear Science Research Institute
ContactPerson *Replace [at] with @	Shinichiro Uesawa Tel : +81-29-282-6078 E-mail : uesawa.shinichiro[at]jaea.go.jp
Summary	In this study, to address multidimensional gas–liquid two phase flows observed in systems such as pressure vessels, we aim to advance both ACE 3D, which is based on the two fluid model, and JUPITER, which employs the Volume of Fluid (VOF) method capable of directly resolving interfacial geometries. These phenomena are critically important for safety assessments, and the establishment of advanced two phase flow analysis techniques is strongly required. For performance evaluation and parameter calibration of the two fluid model, analysis results obtained with JUPITER—capable of capturing detailed interfacial behavior—are used as reference solutions, enabling refinement of models such as bubble size distributions and phase change models. Furthermore, to validate JUPITER, small scale experiments focusing on bubble growth and detachment as well as interfacial deformation are conducted, and the consistency between numerical simulations and experimental results is evaluated. Through this research, improvements in the reliability of multidimensional two phase flow analyses are pursued. (https://nsec.jaea.go.jp/ndre/ndre2/tfg/en/l)
Radiation Worker/ Non-RadiationWorker	Non-Radiation Worker
Field (for reference）	Physics Mathematics Mechanics Measurements and Instruments Computer and Information

No.	37
Theme	Research and Development on Corrosion Phenomena of Nuclear System Materials under Radiation Environments
Department	Research Center for LWR Engineering
Section	Research Group for Nuclear Fuels and Materials
Location	Nuclear Science Research Institute
ContactPerson *Replace [at] with @	Takahiro Igarashi Tel : +81-029-282-5752 E-mail : igarashi.takahiro[at]jaea.go.jp
Summary	Our Group conducts research aimed at ensuring material integrity by electrochemically elucidating corrosion phenomena in metallic materials used in nuclear facilities and related systems. In this research theme, systematic investigations will be carried out to clarify the effects of radiolysis reactions induced by irradiation and solution environments in which multiple metal ions originating from spent nuclear fuel coexist on the corrosion behavior of nuclear system materials. In particular, this study focuses on radiolysis products generated by irradiation and aims to elucidate irradiation-specific mechanisms of corrosion acceleration and inhibition through a combination of corrosion experiments under irradiation and computational analyses. Through this approach, the project seeks to advance methodologies for quantitatively evaluating corrosion damage in nuclear system materials.
Radiation Worker/ Non-RadiationWorker	Radiation Worker
Field (for reference）	Material Chemistry Radiation Measurements and Instruments Computer and Information

No.	38
Theme	Mitigation Strategies for Post-Irradiation Ductility Loss in FeCrAl-ODS Alloys
Department	Research Center for LWR Engineering
Section	Research Group for Nuclear Fuels and Materials
Location	Nuclear Science Research Institute
ContactPerson *Replace [at] with @	Yosuke Abe Tel : +81-29-282-6085 E-mail : abe.yosuke[at]jaea.go.jp
Summary	The research group is engaged in materials development aimed at overcoming post-irradiation ductility loss in FeCrAl-ODS alloys — a leading candidate cladding material for accident-tolerant fuel (ATF) — through ion-irradiation experiments at the TIARA facility. In this project, nanoindentation, transmission electron microscopy (TEM), and atom probe tomography (APT) are performed on pre- and post-irradiation specimens to elucidate how Cr-rich α′ precipitates and irradiation-induced defect clusters govern the mechanical response, thereby establishing design guidelines for optimized alloy compositions and defect-sink microstructures. The work will be carried out in close collaboration with group members, and the specific experimental scope can be tailored to the applicant's research interests and expertise.
Radiation Worker/ Non-RadiationWorker	Non-Radiation Worker
Field (for reference）	Material Measurements and Instruments Radiation Computer and Information

No.	39
Theme	Research on the behavior of fuel cladding materials to contribute to enhanced accident tolerance.
Department	Research Center for LWR Engineering
Section	Research Group for Nuclear Fuels and Materials
Location	Nuclear Science Research Institute
ContactPerson *Replace [at] with @	Yoshiyuki Nemoto Tel : +81-29-282-5306 E-mail : nemoto.yoshiyuki[at]jaea.go.jp
Summary	Japan Atomic Energy Agency (JAEA) is conducting research on the development of accident-tolerant fuel (ATF) that exhibits low oxidation and hydrogen generation even under high temperatures during accidents such as a loss-of-coolant accident (LOCA), ensuring enhanced safety. Specifically, we are performing various experiments and analyses to evaluate the behavior of fuel cladding materials during high-temperature conditions in accidents, including oxidation, hydrogen absorption, deformation, and rupture. This research theme involves conducting these various experiments and analyses. The specific content of the research can be adjusted according to the applicant's preferences. （https://nsec.jaea.go.jp/ATFWS/l）
Radiation Worker/ Non-RadiationWorker	Radiation Worker
Field (for reference）	Material Measurements and Instruments Radiation Mathematics Mechanics Computer and Information

No.	40
Theme	Fundamental Research on Behavior Evaluation of Advanced Technology Fuels for Enhanced Safety and Operational Advancement
Department	Research Center for LWR Engineering
Section	Research Group for Nuclear Fuels and Materials
Location	Nuclear Science Research Institute
ContactPerson *Replace [at] with @	Shuhei Miwa Tel : +81-29-282-5379 E-mail : miwa.shuhei[at]jaea.go.jp
Summary	This research group conducts fundamental studies aimed at improving the safety and advancing the operation of light water reactors and related systems. The focus is on acquiring data, elucidating mechanisms, and developing models for the physical properties and behavior of advanced technology nuclear fuels, as well as the behavior of fission products under accident conditions. Through these efforts, the group builds data and knowledge that contribute to the enhancement of fuel performance analysis codes.In this study, research will be carried out on one of the following topics: the properties and irradiation behavior (using simulated irradiated fuels) of advanced technology fuels aimed at achieving higher burnup (e.g., doped UO2 fuels), or the behavior of fission products under accident conditions. The work includes obtaining experimental data using uranium and simulated fission products, developing computational science methods, and conducting modeling to clarify underlying mechanisms. This research will be conducted in collaboration with group researchers. The specific fuel types and research focus can be adjusted according to the applicant’s preferences.
Radiation Worker/ Non-RadiationWorker	Radiation Worker
Field (for reference）	Physics Chemistry Material Computer and Information

No.	41
Theme	Neutron Scattering Studies of Functional Materials
Department	Materials Sciences Research Center, Nuclear Science Research Institute
Section	Strongly Correlated Materials Research Group
Location	Tokai (Nuclear Science Research Institute)
ContactPerson *Replace [at] with @	Koji　Kaneko Tel : +81-29-284-3808 E-mail : kaneko.koji[at]jaea.go.jp
Summary	The Materials Science Research Center promotes advanced materials science using neutrons and synchrotron radiation, together with the development of state-of-the-art research instruments, at large-scale facilities such as the research reactor JRR-3, the Japan Proton Accelerator Research Complex (J-PARC), and the synchrotron radiation facility SPring-8. In this research theme, the successful candidate will explore functional materials, particulary strongly correlated electron systems, using neutron scattering techniques. Additionally, collaborative work will be performed for development/upgrade of neutron scattering instruments and sample environment, together with data analysis software. Experience in this research field is desirable; however, applications are welcome from motivated early-career researchers who are willing to proactively engage in this research topic, regardless of their prior experience or specific field of expertise. Publication list : （https://msrc.jaea.go.jp/en/result/）
Radiation Worker/ Non-RadiationWorker	Radiation Worker
Field (for reference）	Physics Applied Physics Chemistry Measurements and Instruments Radiation Biology Computer and Information

No.	42
Theme	Research contributing to the advancement of separation technology using neutron scattering techniques
Department	Materials Sciences Research Center, Nuclear Science Research Institute, JAEA
Section	Hierarchical Structure Research Group
Location	Tokai (Nuclear Science Research Institute)
ContactPerson *Replace [at] with @	Yuki Ueda Tel : +81-29-284-3960 E-mail : ueda.yuki[at]jaea.go.jp
Summary	The Materials Science Research Center promotes advanced materials science using neutrons and synchrotron radiation, together with the development of state-of-the-art research instruments, at large-scale facilities such as the research reactor JRR-3, the Japan Proton Accelerator Research Complex (J-PARC), and the synchrotron radiation facility SPring-8.In this research theme, we aim to contribute to the advancement of separation technologies for the recycling of metal resources and the treatment and recycling of radioactive waste by fully exploiting the unique characteristics of the neutron beams available at JRR-3. In addition, this research includes R&D efforts toward further advancement of neutron scattering technologies. While prior research experience in separation and recycling technologies is desirable, it is not mandatory. Motivated young researchers who are willing to tackle this research theme with enthusiasm and initiative are strongly encouraged to apply. Publication list : （https://msrc.jaea.go.jp/en/result/） Beam experimental instruments：（https://msrc.jaea.go.jp/jp/device/l） Beam line：（https://msrc.jaea.go.jp/jp/device/sans-j_pno/l）
Radiation Worker/ Non-RadiationWorker	Radiation Worker
Field (for reference）	Chemistry Physics Applied Chemistry Measurements and Instruments Material Chemical Engineering

No.	43
Theme	Development and applied research of analytical methods using neutrons
Department	Materials Sciences Research Center, Nuclear Science Research Institute, JAEA
Section	Hierarchical Structure Research Group
Location	Tokai (Nuclear Science Research Institute)
ContactPerson *Replace [at] with @	Takahito　Osawa Tel : +81-29-282-6756 E-mail : osawa.takahito[at]jaea.go.jp
Summary	The Materials Science Research Center promotes advanced materials science using neutrons and synchrotron radiation, together with the development of state-of-the-art research instruments, at large-scale facilities such as the research reactor JRR-3, the Japan Proton Accelerator Research Complex (J-PARC), and the synchrotron radiation facility SPring-8. In this research theme, we will focus on neutron-based elemental analysis techniques, specifically neutron activation analysis, prompt gamma-ray analysis, and neutron depth profiling (NDP). The experimental facilities to be used are the irradiation facility and prompt gamma-ray analyzer (PGA) at JRR-3, which are widely used by researchers both inside and outside the organization as a platform for interdisciplinary synergy. Furthermore, as practical examples demonstrating the ubiquitous nature of nuclear energy utilization, the social implementation of laboratory automation technology, born from the automation of analytical instruments, and the development of prompt gamma-ray imaging technology aimed at medical applications in boron neutron capture therapy (BNCT) are being carried out. In addition, as a contribution to a sustainable society, operando visualization of lithium-ion dynamics in all-solid-state batteries using NDP is being conducted. As such, the scope of the research being conducted is broad, but the researchers being recruited will be engaged in one of the following research and development activities: 1. Advancement and applied research of the activation analysis facility at JRR-3. 2. Advancement of PGA, or applied research utilizing PGA. 3. Development of NDP equipment, or applied research utilizing it. Advancement of equipment may include not only methodological improvements but also the development of analysis software. Furthermore, there are no restrictions on the field of applied research. In addition, we do not require prior experience or expertise from young researchers who are enthusiastic and proactive in tackling this theme. Publication list : （https://msrc.jaea.go.jp/en/result/） Beam line：（https://msrc.jaea.go.jp/jp/device/pga/l）
Radiation Worker/ Non-RadiationWorker	Radiation Worker
Field (for reference）	Measurements and Instruments Chemistry Geo and Environemtal Sciences Radiation Robotics Computer and Information Other

No.	44
Theme	Material science research by synchrotron radiation
Department	Materials Sciences Research Center, Nuclear Science Research Institute
Section	Synchrotron Radiation Research Group
Location	Harima, Hyogo
ContactPerson *Replace [at] with @	Shin-ichi Fujimori Tel : +81-70-1493-2188 E-mail : fujimori.shinichi[at]jaea.go.jp
Summary	The Materials Science Research Center promotes advanced materials science using neutrons and synchrotron radiation, together with the development of state-of-the-art research instruments, at large-scale facilities such as the research reactor JRR-3, the Japan Proton Accelerator Research Complex (J-PARC), and the synchrotron radiation facility SPring-8. In this research theme, advanced materials science studies will be carried out primarily using instruments installed at BL23SU, including the soft X-ray angle-resolved photoelectron spectroscopy (ARPES) system and the scanning transmission X-ray microscopy (STXM) system. The successful candidate will also be responsible for the development, maintenance, and operation of these instruments, as well as providing user support for researchers utilizing the synchrotron radiation facility. Due to the SPring-8-II upgrade, BL22XU and BL23SU will be unavailable from August 2026 to August 2028. During this period, research activities will also be conducted at other synchrotron radiation facilities in Japan and abroad. Experience in this research field is desirable; however, applications are welcome from motivated early-career researchers who are willing to proactively engage in this research topic, regardless of their prior experience or specific field of expertise. Publication list : （https://msrc.jaea.go.jp/en/result/） Device：（https://arim.jaea.go.jp/eng/device.html） Beam line：（https://arim.jaea.go.jp/eng/beamline.html
Radiation Worker/ Non-RadiationWorker	Radiation Worker
Field (for reference）	Physics Applied Physics Measurements and Instruments Material

No.	45
Theme	X-ray absorption spectroscopy study on the reaction mechanism of energy conversion materials
Department	Materials Sciences Research Center, Nuclear Science Research Institute
Section	Synchrotron Radiation Research Group
Location	Harima, Hyogo
ContactPerson *Replace [at] with @	Daiju Matsumura Tel : +81-70-1435-6393 E-mail : matsumura.daiju[at]jaea.go.jp
Summary	The Materials Science Research Center promotes advanced materials science using neutrons and synchrotron radiation, together with the development of state-of-the-art research instruments, at large-scale facilities such as the research reactor JRR-3, the Japan Proton Accelerator Research Complex (J-PARC), and the synchrotron radiation facility SPring-8. In this research theme, using X-ray absorption spectroscopy measurement system at SPring-8, we will advance research about energy conversion materials such as fuel cell electrode catalysts, methanol synthesis catalysts, solar cells, and radiation power generation elements. Based on the structural and electronic information of the materials during the reactions, we will clarify the energy conversion mechamism and determine the key structural factors which are the origin of the properties of materials, and feed them back to the production of optimal materials. We encourage an enthusiastic young researcher to submit an application regardless of the previous speciallity. Publication list : （https://msrc.jaea.go.jp/en/result/） Device：（https://arim.jaea.go.jp/eng/device.html） Beam line：（https://arim.jaea.go.jp/eng/beamline.html）
Radiation Worker/ Non-RadiationWorker	Radiation Worker
Field (for reference）	Physics Chemistry Material Applied Chemistry Measurements and Instruments

No.	46
Theme	Development of scintillator-based or gas-based neutron detectors
Department	J-PARC Center
Section	Instrumentation Technology Development Section, Materials and Life Science Division
Location	J-PARC
ContactPerson *Replace [at] with @	Tatsuya Nakamura Tel : +81-29-282-5344 E-mail : nakamura.tatsuya[at]jaea.go.jp
Summary	The successful candidates will be participating in the development of scintillator or gas based neutron detectors for the world-leading pulsed neutron scattering instruments in the J-PARC MLF. The candidates will be involved in the project to improve detector performances such as detection efficiency, spatial resolution, count rate capability. You will have varied and wide ranging duties througout the detector system that will include the development of new detection materials, electronic cirucuit, signal processing and detection method.
Radiation Worker/ Non-RadiationWorker	Radiation Worker
Field (for reference）	Radiation Measurements and Instruments Electricity and Electronics Material

No.	47
Theme	Development and application of a He-3 spin filter for neutron scattering experiments
Department	J-PARC Center
Section	Instrumentation Technology Development Section, Materials and Life Science Division
Location	J-PARC
ContactPerson *Replace [at] with @	Ryuji Maruyama Tel : +81-29-284-3811 E-mail : ryuji.maruyama[at]j-parc.jp
Summary	We will improve He-3 spin filters based on a spin-exchanged optical pumping method and apply them to pulsed neutron beam experiments at J-PARC MLF. Moreover, we will also develop sample environment for the He-3 spin filters to diversify the applicable experiments
Radiation Worker/ Non-RadiationWorker	Radiation Worker
Field (for reference）	Material Physics Chemistry Applied Physics

No.	48
Theme	Research on performance improvement of linac in J-PARC accelerators
Department	J-PARC Center
Section	Accelerator Section I,Accelerator Division
Location	J-PARC
ContactPerson *Replace [at] with @	Takatoshi Morishita Tel : +81-29-284-3142 E-mail : takatoshi.morishita[at]j-parc.jp
Summary	The J-PARC accelerator is being upgraded to stably accelerate 1 MW high-intensity proton beams, and the linac, located at the upstream of the J-PARC accelerator, generates negative hydrogen ion beams and accelerates them up to 400 MeV energy. In this theme, we will study the improvement of beam quality mainly in the linac by using actual machines, test benches, and computer simulations to increase beam power and reduce beam loss. In addition, R&D for upgrading the beam source, accelerating cavity, RF source, magnets, and beam diagnostic equipment will be carried out to achieve stable and high availability operation.
Radiation Worker/ Non-RadiationWorker	Radiation Worker
Field (for reference）	Physics Radiation Electricity and Electronics Applied Physics Measurements and Instruments Computer and Information

No.	49
Theme	Research on high performance beam diagnostic system, control system and vacuum technology of J-PARC accelerator
Department	J-PARC Center
Section	Accelerator Section Ⅲ,Accelerator division
Location	J-PARC
ContactPerson *Replace [at] with @	Junichiro Kamiya Tel : +81-29-284-3164 E-mail : kamiya.junichiro[at]jaea.go.jp
Summary	Since J-PARC is a multi-purpose accelerator, simultaneous operation of different user facilities requires optimization of the operating conditions for each exparimental facility using a beam diagnostics system. In addition, input timing and output data to the beam diagnostics system, etc., must be strictly controlled for each operation mode, which makes it necessary to upgrade the system, including the control system. Furthermore, basic studies on the physics and chemistry of surfaces and materials are necessary to understand vacuum phenomena such as the interaction between ions and walls during high-intensity beam output. In this theme, research and development of elemental technologies for upgrading not only the beam diagnostic system but also various diagnostic, control, and vacuum systems including other components will be conducted. Through this, we aim to contribute to the realization of a facility that provides highly stable operation of accelerators and high-quality beams to all users. More specifically, the postdoctoral researcher will develop a beam diagnostic system that can be used even at high intensity, develop a timing and data acquisition system that can be distinguished for each supplier, develop a system for recording and predicting when equipment malfunctions and their signs, and develop equipment for an ultra-high vacuum system. Postdoctoral fellows may work on one or more of these topics.
Radiation Worker/ Non-RadiationWorker	Radiation Worker
Field (for reference）	Physics Mechanics Applied Physics Material Electricity and Electronics Measurements and Instruments Radiation

No.	50
Theme	R&D on liquid lead-bismuth target technology and proton beam technology for accelerator-driven nuclear transmutation systems (ADS)
Department	J-PARC Center
Section	Proton Beam Application Section, Quantum Beam Technology Division
Location	J-PARC
ContactPerson *Replace [at] with @	Fujio MAEKAWA Tel : +81-29-284-3315 E-mail : maekawa.fujio[at]jaea.go.jp
Summary	At the J-PARC Center, research and development (R&D) is being conducted for accelerator-driven nuclear transmutation systems (ADS) as part of efforts to solve the radioactive waste problem. The efforts are necessary to maximize the use of nuclear energy to realize a decarbonized society. In the R&D on liquid lead-bismuth targets for ADS, thermal-fluidic experiments and material corrosion tests are being conducted using liquid lead-bismuth test loops, and sensors to measure the flow rate and oxygen concentration specific to liquid lead-bismuth are being developed. In the R&D on proton beam technology, nuclear reaction cross-section measurements are being conducted using J-PARC's GeV energy proton beam, and superconducting accelerators for ADS are being developed. In this theme, R&D will be conducted on items from these R&D items that are relevant to the applicant's expertise. (https://j-parc.jp/c/OPEN_HOUSE/2021/others/transmutation.html, in Japanese)
Radiation Worker/ Non-RadiationWorker	Radiation Worker
Field (for reference）	Radiation Applied Physics Physics Chemistry Mechanics Material

No.	51
Theme	Research on materials science under high pressure using neutron diffraction
Department	J-PARC center
Section	Neutron Science Section, Materials and Life Science Division
Location	J-PARC
ContactPerson *Replace [at] with @	Asami Sano Tel : +81-29-284-3283 E-mail : sanoasa[at]post.j-parc.jp
Summary	High-pressure experiments are widely used across various research fields to simulate planetary interiors, synthesize new materials, and provide a controllable external parameter for exploring novel physical properties. In this research project, the successful candidate will investigate the diverse structural changes that materials undergo at high-pressure using a high-pressure neutron diffractometer PLANET in MLF, J-PARC, with the aim of advancing applications in condensed matter physics, materials science, and planetary science. In addition, efforts will be made to develop high-pressure experimental techniques to further enhance the capabilities of the neutron scattering. (https://mlfinfo.jp/en/bl11/)
Radiation Worker/ Non-RadiationWorker	Radiation Worker
Field (for reference）	Physics Chemistry Geo and Environemtal Sciences Material

No.	52
Theme	Research on dynamics in condensed matter using inelastic neutron scattering instruments and related technological developments
Department	J-PARC center
Section	Neutron Science Section, Materials and Life Science Division
Location	J-PARC
ContactPerson *Replace [at] with @	Ryoichi　Kajimoto Tel : +81-29-284-3197 E-mail : ryoichi.kajimoto[at]j-parc.jp
Summary	The inelastic neutron scattering instrument 4SEASONS installed in the Materials and Life Science Experimental Facility at J-PARC can measure spin, lattice, and atomic dynamics in the energy range from a few meV to several hundred meV, and is widely used by domestic and international users to study superconductors, quantum magnets, dielectrics, thermoelectric materials, structural materials, and more. In this theme, the successful candidate will conduct research on dynamics in condensed matter using neutron scattering instruments including 4SEASONS, and develop technologies related to the instrument and data analysis methods to ensure that the instrument remains at the forefront of its class. (https://mlfinfo.jp/en/bl01/)
Radiation Worker/ Non-RadiationWorker	Radiation Worker
Field (for reference）	Physics Chemistry Material Applied Physics Measurements and Instruments

No.	53
Theme	Study on the structure and dynamics of soft matter using isotopic labeling methods
Department	J-PARC Center
Section	Instrumentation Technology Development Section, Materials and Life Science Division
Location	J-PARC
ContactPerson *Replace [at] with @	Takashi Oda Tel : +81-29-287-9618 E-mail : takashi.oda[at]j-parc.jp
Summary	Soft matter, including polymers and biomolecules such as proteins and lipids, possesses extensive internal degrees of freedom, which allow them to exhibit diverse and sophisticated functions. Due to these high degrees of freedom, the structure and mobility of soft matter are inherently complex. To understand these systems, isotopic labeling—which enables the selective observation of specific parts of a sample—is an extremely powerful tool. The objective of this research is to elucidate the structure and dynamics of soft matter through neutron scattering and other experimental techniques by utilizing advanced deuteration technologies for samples.
Radiation Worker/ Non-RadiationWorker	Radiation Worker
Field (for reference）	Biology Material Applied Chemistry

No.	54
Theme	Research and development for improving a beam performance in J-PARC 3 GeV Synchrotron
Department	J-PARC Center
Section	Accelerator Section II,Accelerator division
Location	J-PARC
ContactPerson *Replace [at] with @	Masanobu Yamamoto Tel : +81-29-284-3175 E-mail : masanobu.yamamoto[at]j-parc.jp
Summary	J-PARC accelerator delivers 1 MW proton beam for the experimental users. The reduction of the beam loss and prolonging the life time of the accelerator components are important for the stable accelerator operation. In this research program, (1) the evaluation and experimental verification of the effect by the beam loss on the accelerator components, (2) the evaluation of the beam dynamics and beam diagnostics, (3) the development of the magnet power suplly and rf acceleration system, (4) consolidation of the vacuum system and the development of the charge exchange stripping foil are investigated on J-PARC 3 GeV rapid cycling synchrotron.
Radiation Worker/ Non-RadiationWorker	Radiation Worker
Field (for reference）	Physics Radiation Electricity and Electronics Applied Physics Measurements and Instruments Computer and Information

No.	55
Theme	R&D on the multilayer optics for polarized neutrons
Department	J-PARC Center
Section	Instrumentation Technology Development Section, Materials and Life Science Division
Location	J-PARC
ContactPerson *Replace [at] with @	Ryuji Maruyama Tel : +81-29-284-3811 E-mail : ryuji.maruyama[at]j-parc.jp
Summary	The core component of this role is to join our R&D in the field of the multilayer optics for polarized neutrons which enhances the capability of the polarized neutron scattering technique and meets a veriety of research demands in J-PARC MLF. This will involve elements such as a research of the magnetism of layered systems which are not seen in the bulk and development of the software and technique to analyze the in-plane/out-of-plane magnetic structure of the multilayers using the polarized neutron scattering with considerable flexibility depending on your particular skills and interests. As part of this role you will develop your own scientific research program in the field related to the ones mentioned above in collaboration with the staff in MLF.
Radiation Worker/ Non-RadiationWorker	Radiation Worker
Field (for reference）	Physics Applied Physics

No.	56
Theme	Study on the irradiation behaivor of candidate structural materials at high-intensity spallation neutron source
Department	J-PARC Center
Section	Neutron Source Section, Materials and Life Science Division
Location	J-PARC
ContactPerson *Replace [at] with @	Masahide Harada Tel : +81-29-282-6424 E-mail : harada.masahide[at]jaea.go.jp
Summary	Study on the irradiation properties of the materials that constitute the key components of the currently operating high intensity spallation neutron source at J PARC, with the aim of extending their service life, will be conducted. The J PARC high intensity spallation neutron source is one of the world’s leading facilities, generating intense neutron pulses by a 3 GeV and 1 MW proton beam. Its primary components, such as the mercury target vessel, moderator vessel, reflector vessel, and proton beam window, are exposed to extremely high radiation fields. As a result, these components must be periodically replaced due to irradiation damage. If the irradiation characteristics of these key structural materials can be fully understood, significant improvements in component lifetime can be expected, leading to reduced operational costs and lower environmental impact. This study aims to clarify the irradiation properties of the materials used in these major components by utilizing irradiation tests that have been completed or are planned both inside and outside the facility. We welcome motivated individuals, even if their background differs slightly.
Radiation Worker/ Non-RadiationWorker	Radiation Worker
Field (for reference）	Physics Chemistry Radiation Material Applied Physics

No.	57
Theme	Nano-structure and dynamics of soft matter interfaces studied by neutron techniques
Department	J-PARC center
Section	Neutron Science Section, Materials and Life Science Division
Location	J-PARC
ContactPerson *Replace [at] with @	Hiroyuki Aoki Tel : +81-29-284-3333 E-mail : hiroyuki.aoki[at]j-parc.jp
Summary	The various properties at the surface and interface of softmatters such as polymer materials are different from those in the bulk state. This research project investigate the origin of the surface/interface-specific properties of softmatters by neutron techniques. The strucutre and dynamics at the surface and interfaces is examined by neutron scattering/reflectometry methods in MLF, J-PARC. (https://mlfinfo.jp/en/bl17/)
Radiation Worker/ Non-RadiationWorker	Radiation Worker
Field (for reference）	Material Applied Physics Applied Chemistry

No.	58
Theme	Advancement of Energy-Resolved Neutron Imaging Technology and Its Applications
Department	J-PARC center
Section	Neutron Science Section, Materials and Life Science Division
Location	J-PARC
ContactPerson *Replace [at] with @	Tetsuya Kai Tel : +81-29 284 3208 E-mail : tetsuya.kai[at]j-parc.jp
Summary	The energy-resolved neutron imaging instrument RADEN is equipped with advanced capabilities that extend beyond conventional neutron radiography and tomography. These include visualization of the spatial distributions of crystallographic information of materials (Bragg-edge imaging), elemental information (neutron resonance absorption imaging), magnetic information (polarized neutron imaging), and microstructural information (phase imaging). Owing to these multifunctional imaging techniques, RADEN has been widely utilized in research and development across diverse scientific and engineering fields. This project aims to further advance the associated analysis and visualization methodologies and to explore new application-oriented studies by exploiting their complementary and synergistic use. (https://mlfinfo.jp/en/bl22/)
Radiation Worker/ Non-RadiationWorker	Radiation Worker
Field (for reference）	Physics Geo and Environemtal Sciences Biology Mechanics Material Electricity and Electronics Measurements and Instruments

No.	59
Theme	Deformation mechanisms of high-strength magnesium alloys across a wide temperature range
Department	J-PARC center
Section	Neutron Science Section, Materials and Life Science Division
Location	J-PARC
ContactPerson *Replace [at] with @	Wu Gong Tel : +81-29-284-3268 E-mail : wu.gong[at]j-parc.jp
Summary	This research theme aims to investigate the deformation mechanisms of high-strength magnesium alloys across a wide temperature range. In situ neutron diffraction experiments will be conducted from 77 K to 200 °C using the engineering materials diffractometer “TAKUMI” at J-PARC MLF to quantify the evolution of lattice strain, texture, and phase-specific stress during deformation. These measurements will be complemented by acoustic emission monitoring to correlate discrete deformation events with underlying microstructural changes. The combined approach enables real-time, spatiotemporal characterization of deformation behavior that are not accessible by conventional techniques. The outcomes will advance experimental methodologies and provide fundamental insights into temperature-dependent deformation behavior, guiding the design of high-performance magnesium alloys. (https://mlfinfo.jp/en/bl19/)
Radiation Worker/ Non-RadiationWorker	Radiation Worker
Field (for reference）	Material Physics Mechanics

No.	60
Theme	Study on the release behaivor of radioactive materials at high-intensity spallation neutron source
Department	J-PARC Center
Section	Neutron Source Section, Materials and Life Science Division
Location	J-PARC
ContactPerson *Replace [at] with @	Masahide Harada Tel : +81-29-282-6424 E-mail : harada.masahide[at]jaea.go.jp
Summary	Study on the release behavior of radioactive materials, particularly tritium, from the currently operating high‑intensity spallation neutron source at J‑PARC will be conducted, with the aim of ensuring safe and stable operation. The J‑PARC high‑intensity spallation neutron source is one of the world’s leading facilities, generating intense neutron pulses by a 3‑GeV and 1‑MW proton beam. Because large amounts of radioactive materials are produced in this facility, clarifying their release behavior is essential for maintaining safe and stable operation. To this end, studies are being carried out using cold test facilities and through collaborative research with universities. This project aims to elucidate the behavior of radioactive materials released from the high‑intensity spallation neutron source by utilizing experimental equipment both inside and outside the facility. We welcome motivated individuals, even if their specialty differs slightly.
Radiation Worker/ Non-RadiationWorker	Radiation Worker
Field (for reference）	Physics Chemistry Radiation Material Applied Physics

No.	61
Theme	Leading research on the advanced use of pulsed polarized neutrons
Department	J-PARC Center
Section	Instrumentation Technology Development Section, Materials and Life Science Division
Location	J-PARC
ContactPerson *Replace [at] with @	Ryuji Maruyama Tel : +81-29-284-3811 E-mail : ryuji.maruyama[at]j-parc.jp
Summary	At the Materials and Life Science Experimental Facility (MLF), a ³He gas-based neutron polarization device has been developed, enabling the polarization of neutrons with a high degree of polarization over a wide energy range, including the epithermal region, which had previously been inaccessible. This research aims to promote the generalization and broader application of this technology, as well as to develop and enhance sample environment equipment compatible with the polarization device. Through these efforts, the project will pursue pioneering studies utilizing polarized neutrons in energy regions that have not been explored before.
Radiation Worker/ Non-RadiationWorker	Radiation Worker
Field (for reference）	Material Physics Chemistry Applied Physics

No.	62
Theme	Research and Development of Probabilistic Risk Assessment Method for Sodium Cooled Fast Reactor
Department	Fast Reactor Research and Development Department
Section	Fast Reactor Safety Design Group
Location	Oarai Nuclear Engineering Institute
ContactPerson *Replace [at] with @	Nishino Hiroyuki Tel : +81-29-267-1919 (Ext.6772) E-mail : nishino.hiroyuki[at]jaea.go.jp
Summary	JAEA has been developing level 1 to 3 Probabilistic Risk Assessment (PRA) methods for internal and external events in SFRs through international cooperation, toward application to demonstration reactor of sodium-cooled fast reactor (SFR) in Japan. This study aims to construct PRA models to quantify frequency of core damage induced by internal or external events (e.g., internal fire, earthquakes), and to obtain risk information for safety design of the demonstration reactor. To achieve this objective, a variety of topics are considered as follows; (i) development of evaluation methods for occurrence probabilities of headings (i.e., phenomenological events in the reactor vessel after core damage) defined in event trees of level 2 PRA, (ii) development of fragility evaluation methods for important components for decay heat removal against seismic events, (iii) development of PRA methods against internal fire for SFRs. Applicants may discuss the topics with the contact person according to their interests.
Radiation Worker/ Non-RadiationWorker	Non-Radiation Worker
Field (for reference）	Physics Mathematics Radiation Mechanics

No.	63
Theme	Experimental study on core melt relocation behavior during a severe accident in sodium-cooled fast reactors
Department	Fast Reactor Research and Development Department
Section	Fast Reactor Safety Engineering Group
Location	Oarai Nuclear Engineerign Institute
ContactPerson *Replace [at] with @	Kenichi Matsuba Tel : +81-29-267-1919 (Ext.6452) E-mail : matsuba.kennichi[at]jaea.go.jp
Summary	During a severe accident in sodium-cooled fast reactors, the core melt relocates in the reactor vessel. In order to evaluate the relocation behavior of the core melt, JAEA is conducting severe accident experiments such as the joint program with the National Nuclear Center of Republic of Kazakhstan (NNC RK) and is developing simulation technologies such as the fast reactor safety analysis code SIMMER. In this study, we will examine the implementation of severe accident experiments including pre-evaluation and post data analysis, analysis using SIMMER code, and improvement and validation of analysis models. (https://www.jaea.go.jp/04/sefard/randd/development/arcadia/comprehensive/safety/analysis/)
Radiation Worker/ Non-RadiationWorker	Non-Radiation Worker
Field (for reference）	Physics Mechanics Computer and Information

No.	64
Theme	Research and development on fabrication technology for fast reactor fuels such as metal fuel
Department	Fuels and Materials Department
Section	Fuel Monitoring Section
Location	Oarai Nuclear Engineering Institute
ContactPerson *Replace [at] with @	Yoshihiro Sekio Tel : +81-29-267-1919 (Ext.5511) E-mail : sekio.yoshihiro[at]jaea.go.jp
Summary	In Fuel Monitoring Facility (FMF), a research on the performance evaluation of fast reactor fuels has been carried out in order to develop a demonstration fast reactor. This research focuses on developing fabrication technology of fuel samples such as metal fuel using radioisotope handling equipment (glove boxes) and various devices, as well as analytical and evaluation methods for the fabricated samples. Mainly, technology development and optimization of fuel fabrication process (electric reduction of MOX pellets in molten salts, fabrication of metal fuel slugs by an injection casting method, etc.), experimental study on eutectic reaction between fuels and a stainless steel, and analyses of fuel samples (electrochemical measurements, thermal analyses, etc.) will be carried out.
Radiation Worker/ Non-RadiationWorker	Radiation Worker
Field (for reference）	Physics Chemistry Radiation Material Measurements and Instruments

No.	65
Theme	Research and development on source term analysis technology for fast reactor fuels
Department	Fuels and Materials Department
Section	Fuel Monitoring Section
Location	Oarai Nuclear Engineering Institute
ContactPerson *Replace [at] with @	Yoshihiro Sekio Tel : +81-29-267-1919 (Ext.5511) E-mail : sekio.yoshihiro[at]jaea.go.jp
Summary	In Fuel Monitoring Facility (FMF), a research on the performance evaluation of fast reactor fuels has been carried out in order to develop a demonstration fast reactor. This research focuses on evaluating the behavior of fission products (FP) originating from nuclear fuels using radioisotope handling equipment (hot cells and glove boxes) and a source term testing device which designed to heat samples and analyze volatile FP gases. Mainly, development and optimization of a sample preparation method for source term experiments, source term experiments of fuel samples such as metal fuel including simulated FP elements, will be carried out.
Radiation Worker/ Non-RadiationWorker	Radiation Worker
Field (for reference）	Physics Chemistry Radiation Material Measurements and Instruments

No.	66
Theme	Research and development on high-precission isotopic analysis technology for liquid samples of 1F fuel debris etc.
Department	Fuels and Materials Department
Section	Fuel Monitoring Section
Location	Oarai Nuclear Engineering Institute
ContactPerson *Replace [at] with @	Yoshihiro Sekio Tel : +81-29-267-1919 (Ext.5511) E-mail : sekio.yoshihiro[at]jaea.go.jp
Summary	Based on handling technology of nuclear fuel including fast reactor fuel, a research on the chemical analysis for supporting the decomissioning of Fukushima daiichi nuclear power satation (1F) has been carried in Fuel Monitoring Facility (FMF). By using thermal ionization mass spectrometer (TIMS) which can analyze isotope with high precision, this research focuses on the analysis and evaluation of isotopic composition of actinides nuclides in the 1F fuel debris and solid radioactive waste. Mainly, development and optimization of a sample dissolution method, nuclides separation method and sample preparation method for TIMS, validation of analysis data and evalution of generation process of 1F fuel debris through the analysis of 1F fuel debris, will be carried out.
Radiation Worker/ Non-RadiationWorker	Radiation Worker
Field (for reference）	Chemistry Measurements and Instruments Material Radiation Physics

No.	67
Theme	Research and development on high-precission elemental analysis technology for solid samples of 1F fuel debris etc.
Department	Fuels and Materials Department
Section	Fuel Monitoring Section
Location	Oarai Nuclear Engineering Institute
ContactPerson *Replace [at] with @	Yoshihiro Sekio Tel : +81-29-267-1919 (Ext.5511) E-mail : sekio.yoshihiro[at]jaea.go.jp
Summary	Based on handling technology of nuclear fuel including fast reactor fuel, a research on the elemental analysis for supporting the decomissioning of Fukushima daiichi nuclear power satation (1F) has been carried in Fuel Monitoring Facility (FMF). By using electron probe micro analyzer (EPMA) which can analyze elemental composion in the local area with high precision, this research focuses on the analysis and evaluation of elemental composion (sort and quantitiy) in the 1F fuel debris and solid radioactive waste. Mainly, using 1F fuel debris or simulated fuel debris, development and optimization of a sample preparation method, the multiple analyses by EPMA and the data analysis will be carried out. Then, the reliability and representativeness evaluation of the analysis data will be carried out.
Radiation Worker/ Non-RadiationWorker	Radiation Worker
Field (for reference）	Physics Measurements and Instruments Material Radiation Chemistry

No.	68
Theme	Research and development on irradiation target preparation technology for Ac-225 production using "Joyo"
Department	Fuels and Materials Department
Section	Fuel Monitoring Section
Location	Oarai Nuclear Engineering Institute
ContactPerson *Replace [at] with @	Yoshihiro Sekio Tel : +81-29-267-1919 (Ext.5511) E-mail : sekio.yoshihiro[at]jaea.go.jp
Summary	In Fuel Monitoring Facility (FMF), a research and development on the production of Ac-225 for a medical radioisotope (RI) has been carried in collaboration with the experimental fast reactor "Joyo". This research focuses on research and development into the preparation technology of Ra-226 irradiation targets and their analysis and evaluation, using radioisotope handling equipment (hot cells and glove boxes) and various devices, in order to produce Ac-225 by the nuclear transmutation reaction of Ra-226 in "Joyo". Mainly, development and optimization of the preparation (molding, heat treatment, etc.) of Ra-226 irradiation targets and the pre-analysis sample preparation method, as well as various analyses (composition, crystal structure, etc.) and data analysis to evaluate the physicochemical properties of the prepared irradiation targets and evaluation of their feasibility as irradiation targets will be carried out.
Radiation Worker/ Non-RadiationWorker	Radiation Worker
Field (for reference）	Physics Material Radiation Chemistry Measurements and Instruments

No.	69
Theme	Research and development on chemical separation and extraction technology for Ac-225 production using "Joyo"
Department	Fuels and Materials Department
Section	Fuel Monitoring Section
Location	Oarai Nuclear Engineering Institute
ContactPerson *Replace [at] with @	Yoshihiro Sekio Tel : +81-29-267-1919 (Ext.5511) E-mail : sekio.yoshihiro[at]jaea.go.jp
Summary	In Fuel Monitoring Facility (FMF), a research and development on the production of Ac-225 for a medical radioisotope (RI) has been carried in collaboration with the experimental fast reactor "Joyo". This research focuses on research and development of chemical separation and extraction technology of Ac-225 (with multiple nuclides in irradiated targets) produced by "Joyo" using radioisotope handling equipment (hot cells and glove boxes) and various devices. Mainly, development and optimization of a chemical separation and extraction methods of Ac-225 from irradiated targets and pre-analytical sample preparation methods, and various analyses (radioactivity, purity, etc.) and data analysis of the extracted Ac-225 solution to evaluate the collection rate of Ac-225 and the validity of the separation and extraction technology will be carried out.
Radiation Worker/ Non-RadiationWorker	Radiation Worker
Field (for reference）	Chemistry Other Measurements and Instruments Material Radiation Physics

No.	70
Theme	R&Ds on applied laser technologies for decommissioning
Department	Tsuruga Comprehensive Research and Development Center
Section	Advanced Technology Development
Location	Tsuruga Head Office
ContactPerson *Replace [at] with @	Hiroaki　Mori Tel : +81-80-4433-6349 E-mail : mori.hiroaki[at]jaea.go.jp
Summary	Our main mission is the research and development of laser processing technologies, such as laser cutting and laser decontamination, that can be applied to the decommissioning of nuclear reactor facilities. In addition to experiments, we are also developing numerical analysis techniques for laser processing. By combining experiments and analysis, we are able to understand various physical phenomena, including the plasma generated on the surface of laser irradiated objects, and we are also conducting research to deside appropriate laser irradiation conditions for various laser processing of various materials. On the other hand, laser processing is a widely used technology in industrial fields, and in order to enable our developed technologies to be used in various fields, we are conducting research into its application not only to the cutting and decontamination, but also to heat treatment, rust removal and rust prevention treatment, welding and joining technology, etc. (https://www.jaea.go.jp/04/tsk/english/kenkyu/kenkyu-1.html)
Radiation Worker/ Non-RadiationWorker	Non-Radiation Worker
Field (for reference）	Material Mechanics Computer and Information Electricity and Electronics Applied Physics Measurements and Instruments

No.	71
Theme	R&D of Remote Maintenance Robotics for Nuclear Fuel Cycle Technology Development
Department	Nuclear Backend Technology Development DepartmentNuclear Fuel Cycle Engineering Laboratories
Section	Engineering Development Section
Location	Tokai-mura, Ibaraki (Nuclear Fuel Cycle Engineering Laboratories)
ContactPerson *Replace [at] with @	Sou　Watanabe Tel : +81-29-282-1133 (Ext.66801) E-mail : watanabe.sou[at]jaea.go.jp
Summary	Research and development will be conducted on the design, prototyping, and testing of a next-generation master–slave robotic manipulator. The objective is to apply this system to spent fuel reprocessing processes in nuclear power generation using advanced reactors, where it must be capable of operating under severe conditions, such as high-radiation environments. This study aims to develop a general-purpose system adaptable to diverse tasks. Deployment challenges will be investigated and addressed through iterative hardware and software improvements. A prototype will be fabricated and tested to evaluate performance and reliability. In addition to the robotic system itself, this research also includes the design and optimization of the operation interface. An interest in this field is therefore desirable. Candidates are also expected to be able to engage in testing activities at demonstration sites where safety equipment must be worn.
Radiation Worker/ Non-RadiationWorker	Non-Radiation Worker
Field (for reference）	Mechanics Robotics Radiation

No.	72
Theme	R&D of Fuel Dissolution Behavior Related for Nuclear Fuel Cycle Technology Development
Department	Nuclear Backend Technology Development DepartmentNuclear Fuel Cycle Engineering Laboratories
Section	Engineering Development Section
Location	Tokai-mura, Ibaraki (Nuclear Fuel Cycle Engineering Laboratories)
ContactPerson *Replace [at] with @	Sou　Watanabe Tel : +81-29-282-1133 (Ext.66801) E-mail : watanabe.sou[at]jaea.go.jp
Summary	Research and development will be conducted on nitric acid dissolution testing of nuclear fuel, as well as on the design, fabrication, and testing of a dissolver for plant-scale implementation. The objective is to apply these technologies to spent fuel reprocessing processes in nuclear power generation using advanced reactors. This study will investigate the behavior of nitrous acid, which contributes to the dissolution rate during nitric acid dissolution of fuel, and examine its applicability to engineering-scale test systems for actual deployment. Dissolution behavior, including the effects of nitrous acid, will be studied through component testing. In addition, this research includes engineering-scale experiments using uranium in controlled areas. An interest in this field is therefore desirable.a strong interest in this field is expected.
Radiation Worker/ Non-RadiationWorker	Radiation Worker
Field (for reference）	Chemistry Chemical Engineering Radiation