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Recruitment for Postdoctoral Fellow 2026 (Fixed-term researcher)
Recruitment Field for Postdoctoral Fellow of JAEA

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No.	1
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 @	Tomoki Yamaguchi Tel : +81-80-9665-9130 E-mail : yamaguchi.tomoki[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 Chemistry Radiation Measurements and Instruments Computer and Information Robotics Other

No.	2
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 @	Tomoki Yamaguchi Tel : +81-80-9665-9130 E-mail : yamaguchi.tomoki[at]jaea.go.jp
Summary	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 Chemistry Radiation Measurements and Instruments Computer and Information Robotics Other

No.	3
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	Policy Research Office
Location	Head Office
ContactPerson *Replace [at] with @	Taro　Tomoki Yamaguchi Tel : +81-80-9665-9130 E-mail : yamaguchi.tomoki[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.	4
Theme	R&D on establishment of mid-and-long-term behavior estimation method for a cementitious solidified product
Department	Nuclear Backend Technology Development DepartmentNuclear Fuel Cycle Engineering Laboratories
Section	Waste Treatment Technology Section
Location	Tokai-mura, Ibaraki(Nuclear Fuel Cycle Engineering Laboratories)
ContactPerson *Replace [at] with @	OSUGI Takeshi Tel : +81-29-282-1133 (ext. 65700) E-mail : ncl-saiyo[at]jaea.go.jp
Summary	This R&D attempts to verify and establish estimation methods on analysis of a mid-and-long-term behavior and to construct analytical model for revealing the deterioration mechanisms, and will contribute to selection of methods for management of radioactive wastes arising from decommissioning operations. A wide variety of radioactive wastes have arisen from decommissioning of the Fukushima Daiichi Nuclear Power Station. These wastes need to be managed (storage, processing, disposal) for a certain period. It is almost impossible to obtain each data on the soundness and deterioration of a waste solidified product for all wastes, since characteristics of a waste solidified product changes according to properties of the wastes.
Radiation Worker/ Non-RadiationWorker	Non-Radiation Worker
Field (for reference）	Material Geo and Environmental Sciences Architectural and Civil Engineering Chemical Engineering Applied Physics Computer and Information

No.	5
Theme	R&D on Robot Technology for Radioactive Waste Processing
Department	Nuclear Backend Technology Development DepartmentNuclear Fuel Cycle Engineering Laboratories
Section	Waste Treatment Technology Section
Location	Tokai-mura, Ibaraki(Nuclear Fuel Cycle Engineering Laboratories)
ContactPerson *Replace [at] with @	OSUGI Takeshi Tel : +81-29-282-1133 (ext. 65700) E-mail : ncl-saiyo[at]jaea.go.jp
Summary	The separation and disassembly of radioactive waste at nuclear facilities are primarily manual processes, with reducing exposure and improving efficiency as ongoing challenges. This R&D project attempts to apply robotic technology to radioactive waste treatment to improve safety and reduce costs. The plan includes testing cutting, disassembling, and moving simulated wastes, such as exhaust filters, using industrial robots (manipulators/control devices), collaborative robots, and cameras. These tasks will be managed through master-slave remote control and enhanced by semi-autonomous control using deep learning models.
Radiation Worker/ Non-RadiationWorker	Non-Radiation Worker
Field (for reference）	Mechanics Material Electricity and Electronics Architectural and Civil Engineering Applied Physics Computer and Information Robotics

No.	6
Theme	R&D on Analytical Techniques for Radioactive Waste Inventory Assessment
Department	Nuclear Backend Technology Development DepartmentNuclear Fuel Cycle Engineering Laboratories
Section	Waste Treatment Technology Section
Location	Tokai-mura, Ibaraki(Nuclear Fuel Cycle Engineering Laboratories)
ContactPerson *Replace [at] with @	OSUGI Takeshi Tel : +81-29-282-1133 (ext. 65700) E-mail : ncl-saiyo[at]jaea.go.jp
Summary	Radioactive wastes are generated by a variety of nuclear facilities. To ensure their safe treatment and disposal, it is essential to accurately evaluate their radioactive inventory. Therefore, R&D of efficient and rational novel methods for radioactive inventory assessment is required. This research aims to support the selection of appropriate waste immobilization technologies, the establishment of disposal facility standards, and the implementation of safety assessments by developing and validating methods for estimating radioactive inventories through analytical techniques.
Radiation Worker/ Non-RadiationWorker	Non-Radiation Worker
Field (for reference）	Mathematics Geo and Environmental Sciences Radiation Material Electricity and Electronics Measurements and Instruments Computer and Information

No.	7
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 surface and interface properties of softmatters, such as polymer materials, are different from those in the bulk state. This research project investigates the origin of the surface/interface specific properties of softmatters using neutron techniques. The structure and dynamics at the surface and interfaces will be studied by neutron scattering/reflectometry methods using labelled samples prepared in the deuteration laboratory at MLF, J-PARC. (https://mlfinfo.jp/en/bl17/)
Radiation Worker/ Non-RadiationWorker	Radiation Worker
Field (for reference）	Material Applied Physics Applied Chemistry

No.	8
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 Chemistry Applied Physics Material Radiation Electricity and Electronics Measurements and Instruments

No.	9
Theme	Structure and dynamics of soft matters studied by isotope labeling methods
Department	J-PARC Center
Section	Technology Development , 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	Unique functions of soft matter, such as proteins, lipids and polymer materials, originate from the large degree of freedom of a consisting molecule. Neutron scattering techniques with isotope-labeled samples are powerful tools to elucidate the structure and dynamics of soft matters because it enables the selective measurement of a specific site in a molecule. This research topic aims at the elucidation of structure and dynamics of soft matters by neutron scattering methods using deuterated samples.
Radiation Worker/ Non-RadiationWorker	Radiation Worker
Field (for reference）	Biology Material Applied Chemistry

No.	10
Theme	Study on performance improvement of power supply for J-PARC accelerator
Department	J-PARC Center
Section	Accelerator Section Ⅳ, Accelerator Division
Location	J-PARC
ContactPerson *Replace [at] with @	Tel : +81-29-284-3262 E-mail : tomohiro.takayanagi[at]j-parc.jp
Summary	We have been promoting the upgrading of accelerator power supplies to achieve stable operation at a maximum output of 1 MW based on the facility's mid- to long-term plan at J-PARC. In this theme, we will conduct research and development of new power supplies using SiC power devices, one of the next-generation power semiconductors, which are smaller, consume less power, and have higher efficiency compared to power supplies using conventional Si power devices.
Radiation Worker/ Non-RadiationWorker	Radiation Worker
Field (for reference）	Physics Radiation Measurements and Instruments Material Measurements and Instruments Computer and Information

No.	11
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.	12
Theme	Application of advanced computational / information science on neutron scattering measurements and analyses at a pulsed neutron source facility
Department	J-PARC Center
Section	Technology Development , Materials and Life Science Division
Location	J-PARC
ContactPerson *Replace [at] with @	Kazuyoshi　Tatsumi Tel : +81-29-284-3169 E-mail : tatsumi.kazuyoshi[at]jaea.go.jp
Summary	We have tried to apply computational/infomration sciences toward neutron scattering measurements and analyses in J-PARC MLF so as to utilize the measurements more effectively in materials and life science. The postdoctoral fellow shall develop such analyses methods as combining the experimental neutron scattering data and computations based on machine learning atomic potentials so as to analyze the atomistic static or dynamic information or utilizing aritificial neural netowork to denoise the experimental spectra by preparing the adequate training data sets. The postdoctoral fellow shall willingly discuss on the targeted method with staffs in tecnology development section and related beam line staffs. We hope a powerful person who can construct the atomistic models which explain the experimental data by means of the computational materials science methods or who can apply the state-of-the-art machine learning methods to the experimental neutron scattering data.
Radiation Worker/ Non-RadiationWorker	Radiation Worker
Field (for reference）	Computer and Information Measurements and Instruments Mathematics Material

No.	13
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 Electricityand Electronics Applied Physics Measurements and Instruments Computer and Information

No.	14
Theme	Development of scintillator-based or gas-based neutron detectors
Department	J-PARC Center
Section	Neutron Instrumentation 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 Electricityand Electronics Material

No.	15
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	Increasing a beam power toward a 1 MW in progress at J-PARC accelerators. 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 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 Electricityand Electronics Applied Physics Measurements and Instruments Computer and Information

No.	16
Theme	Mechanical properties evaluation of irradated materials for the structural materials of the high-power spallation target
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	Mechanical properies data for the post irradiation materials for utilize the target in high-energy accelerator facilies are insufficient. In this resarch, in order to clarify the mechanical peoperties change of the structural materials for the mercury target vessel (SS316L) and the proton beam window (Alminum alloy) accomapny by the beam operation with a 3 GeV pulsed proton beams, mechaical property mesurament including fatigue test for the development of post irradiation examination technique will be conducted.
Radiation Worker/ Non-RadiationWorker	Radiation Worker
Field (for reference）	Physics Chemistry Radiation Material Applied Physics

No.	17
Theme	R&D on J-PARC Proton Beam Irradiation Facility
Department	J-PARC Center
Section	Nuclear Transmutation 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 Japan Proton Accelerator Research Complex (J-PARC), we are currently designing the "Proton Beam Irradiation Facility" that will utilize a J-PARC's proton beam in a variety of applications for contributing to the new future that JAEA aims for with "nuclear x renewable." Specific application areas include contributions to space development and advanced information society through soft error testing of semiconductor devices by proton/neutron irradiation, medical RI production using nuclear reactions, and development of technology to reduce high-level radioactive waste using accelerators. In this theme, we will develop technology to control the energy, intensity, and profile of the proton beam to suit these applications, and will design the beam irradiation devices and the target by making full use of nuclear reaction simulations and thermal analysis. (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.	18
Theme	Materials science research using the single-crystal neutron diffractometer at J-PARC.
Department	J-PARC Center
Section	Neutron Science Section, Materials and Life Science Division
Location	J-PARC
ContactPerson *Replace [at] with @	Takashi Ohhara Tel : +81-29-284-3092 E-mail : takashi.ohhara[at]j-parc.jp
Summary	We are looking for a post-doctoral researcher to join the instrument group of a single-crystal neutron diffractometer SENJU at J-PARC MLF. The researcher will be expected to conduct research on the correlation between the behavior of protons and magnetic spins in crystals and the properties of materials by using SENJU and other instruments or to conduct research and development on measurement and analysis methods to expand the use of single-crystal neutron diffractometers. This will expand the potential of the single-crystal neutron diffraction technique and also diversify the technologies offered by JAEA. (https://mlfinfo.jp/en/bl18/)
Radiation Worker/ Non-RadiationWorker	Radiation Worker
Field (for reference）	Physics Chemistry Mathematics Measurements and Instruments

No.	19
Theme	R&D on the multilayer optics for polarized neutrons
Department	J-PARC Center
Section	Neutron Instrumentation 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.	20
Theme	Development and application of a He-3 spin filter for neutron scattering experiments
Department	J-PARC Center
Section	Technology Development , Materials and Life Science Division
Location	J-PARC
ContactPerson *Replace [at] with @	Takayuki Oku Tel : +81-29-284-3196 E-mail : takayuki.oku[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.	21
Theme	Research and development on the structure and function of engineering materials under extreme conditions using in-situ neutron diffraction
Department	J-PARC Center
Section	Neutron Science Section, Materials and Life Science Division
Location	J-PARC
ContactPerson *Replace [at] with @	Stefanus Harjo Tel : +81-29-284-3266 E-mail : stefanus.harjo[at]j-parc.jp
Summary	This theme involves research on the mechanisms of mechanical and functional properties manifestation of engineering materials (including steel, light metals such as aluminum alloys and magnesium alloys, ceramics, composite materials, etc.) under extreme conditions such as high temperatures, ultra-low temperatures, hydrogen environments, and repeated loads. Additionally, it includes the development of hybrid material evaluation methods combining in-situ neutron diffraction with acoustic emission methods and non-contact displacement measurement methods, as well as the development of measurement methods and equipment for sample environment devices necessary for material research under extreme conditions. (https://mlfinfo.jp/en/bl19/)
Radiation Worker/ Non-RadiationWorker	Radiation Worker
Field (for reference）	Material Mechanics Applied Physics

No.	22
Theme	Study on the behavior of nuclides produced in a liquid mercury spallation target
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	In the spallation neutron source at J-PARC, a 3 GeV and 1MW proton beam is injected into a mercury target, producing various nuclides. Among them, tritium is adsorbed onto the SUS316L stainless steel container including mercury, and it is a important issue to understand the behavior of tritium in the mercury and SUS316L. In this study, experiments using test instruments and modeling studies of adsorption and desorption in metal materials will be conducted to understand the behavior of tritium.
Radiation Worker/ Non-RadiationWorker	Radiation Worker
Field (for reference）	Physics Chemistry Radiation Material Applied Physics

No.	23
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 @	Yasuteru Sibamoto Tel : +81-29-282-5263 E-mail : sibamoto.yasuteru[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.	24
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 @	Shogo Takahara Tel : +81-29-282-6139 E-mail : takahara.shogo[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.	25
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.
Radiation Worker/ Non-RadiationWorker	Radiation Worker
Field (for reference）	Mechanics Material Measurements and Instruments Computer and Information Physics Applied Physics

No.	26
Theme	Study on the methodology of seismic safety and structural integrity assessment for nuclear buildings and components
Department	Nuclear Safety Research Center
Section	Seismic Safety and Structural Integrity Research Group
Location	Tokai
ContactPerson *Replace [at] with @	Akemi Nishida Tel : +81-29-282-5324 E-mail : nishida.akemi[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.
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.	27
Theme	Study on release and transport behavior of radioactive materials in reprocessing plant under severe accident conditions
Department	Nuclear Safety Research Center
Section	Fuel Cycle Safety Research Group
Location	Tokai
ContactPerson *Replace [at] with @	Seiji Takeda Tel : +81-29-282-6170 E-mail : takeda.seiji[at]jaea.go.jp
Summary	Newly defined as severe accidents in fuel reprocessing plant are organic solvent fire in cell as well as boiling and exsiccation of highly-active liquid waste in concentrators, 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.	28
Theme	Study on safety assessment of decommissioning of nuclear facilities
Department	Nuclear Safety Research Center
Section	Waste and Environmental Safety Research Group
Location	Tokai
ContactPerson *Replace [at] with @	Taro Shimada Tel : +81-29-284-3714 E-mail : shimada.taro[at]jaea.go.jp
Summary	In the decommissioning of nuclear facilities, it is required to evaluate the exposure doses of the public and workers at each stage of planning and completion, the doses should be comfirmed to be compliance with dose criteria. In addition, the IAEA recommendation mentions minimizing the amount of radioactive waste arising during decommissioning. Furthermore, it is also necessary to appropriately manage temporal and spatial changes of risk depending on the progress of dismantling works and fuel debris retrieval in Fukushima Daiichi Nuclear Power Station (1F). Therefore, this study focuses on the sophistication of methods for evaluating the validity of the planning and implementation of decommissioning work for nuclear installations and the completion of decommissioning as follows. - Development of modeling and evaluation methods for optimizing indicators such as the amount of radioactive waste generated, reduction of exposure dose of workers, and cost - Research on evaluation of exposure risks changing according to the progress of dismantling works of the facilities and fuel debris retrieval in 1F
Radiation Worker/ Non-RadiationWorker	Non-Radiation Worker
Field (for reference）	Physics Radiation Computer and Information

No.	29
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	Fuel Cycle Safety Research Division, 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.	30
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.	31
Theme	Development of a rechargeable battery using uranium as an active material
Department	Nuclear Science Research InstituteNXR Development Center
Section	Special Team for Battery Energy Storage
Location	Tokai
ContactPerson *Replace [at] with @	Kazuki Ouchi Tel : +81-029-282-5912 E-mail : ouchi.kazuki[at]jaea.go.jp
Summary	Approximately 16,000 tons of depleted uranium is currently stored in Japan, and effective utilization methods are needed. The NXR Development Center's Special Team for Battery Energy Storage is studying and developing a rechargeable battery that uses the electrode reaction of uranium as one method of utilization.This theme aims to develop new rechargeable batteries by exploring the electrode reaction of uranium, developing materials for rechargeable batteries, and designing manufacturing processes. Although experience in the relevant field is desirable, young researchers who can work on this theme with enthusiasm and initiative are not required to have any previous experience or expertise in the field.
Radiation Worker/ Non-RadiationWorker	Radiation Worker
Field (for reference）	Chemistry Chemical Engineering Material Electricityand Electronics Measurements and Instruments

No.	32
Theme	Innovation in Hydrogen and Deuterium Production Technologies Aimed at Achieving Both Carbon Neutrality and the Generation of High-Value Resources
Department	Nuclear Science Research InstitutePioneer Laboratory
Section	Yasuda's Lab for Development of Deuterium Separation Technology
Location	Tokai(Nuclear Science Research Institute)
ContactPerson *Replace [at] with @	Satoshi Yasuda Tel : +81-29-282-6081 E-mail : yasuda.satoshi[at]jaea.go.jp
Summary	Aiming to realize a sustainable society through carbon neutrality, our research explores innovative technologies for material separation and energy conversion by leveraging electrochemistry, catalytic materials chemistry, and materials design. One key focus is the development of cost-effective methods for simultaneous hydrogen production and deuterium separation—an energy carrier and a high-value isotope.　This approach will lay the foundation for domestic production of deuterium, which is currently expensive and imported, despite being essential for semiconductors, pharmaceuticals, chemical synthesis, and nuclear fusion fuel. We are currently engaged in the following key research areas: ・Development of innovative technologies enabling simultaneous hydrogen and deuterium production via water electrolysis ・Advancement of efficient deuterium enrichment techniques and novel catalysts ・Synthesis of deuterium-substituted compounds with potential for industrial applications Our lab is characterized by its interdisciplinary approach, integrating knowledge and techniques from chemistry, physics, and engineering to advance a wide range of research, from the fundamental science of material separation and energy conversion to practical social implementation through industry-academia collaboration.
Radiation Worker/ Non-RadiationWorker	Non-Radiation Worker
Field (for reference）	Physics Chemistry Material Applied Physics Applied Chemistry Chemical Engineering Measurements and Instruments

No.	33
Theme	Development of Biomass-Based Functional Materials for Seawater Resource Extraction and Carbon Dioxide Conversion toward a Sustainable Future
Department	Pioneer Laboratory
Section	Laboratory for Development of Bioresource Technology
Location	Nuclear Science Research Institute
ContactPerson *Replace [at] with @	Yurina　Sekine Tel : +81-29-284-3864 E-mail : sekine.yurina[at]jaea.go.jp
Summary	At our laboratory, we are developing novel technologies that contribute to the realization of a sustainable society through the design and fabrication of porous and functional materials based on biomass resources and waste-derived materials. In particular, we utilize natural polymer-based porous structures with high surface area and hydrophilicity, created via techniques such as freeze-crosslinking, to address the following complex social and environmental challenges: ・Recovery of rare metals such as uranium from seawater to promote the utilization of untapped resources and ensure stable energy supply ・O₂ capture and conversion to contribute to a carbon-neutral society ・Recycling of spent adsorbents and the development of circular material systems This research theme integrates interdisciplinary knowledge in materials chemistry, surface/interface science, analytical chemistry, environmental engineering, and catalysis. Participants will gain hands-on experience across a wide range of research phases—from laboratory-scale material synthesis and performance evaluation to the design of systems aimed at real-world implementation. Furthermore, the laboratory provides ample opportunities to engage in cross-disciplinary collaborations and joint projects with academia, industry, and government sectors, offering a rich environment for aspiring researchers to grow toward independent research careers.
Radiation Worker/ Non-RadiationWorker	Radiation Worker
Field (for reference）	Chemistry Material Applied Chemistry Applied Physics

No.	34
Theme	Development and Application of Functional Materials Based on Soil Clay Minerals for Sustainable Resource Utilization
Department	Nuclear Science Research Institute 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. https://msrc.jaea.go.jp/jp/result/publications/actinoid/ https://arim.jaea.go.jp/jp/device.html
Radiation Worker/ Non-RadiationWorker	Radiation Worker
Field (for reference）	Material Geo and Environemtal Sciences Applied Physics Measurements and Instruments Physics Chemistry

No.	35
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 and/or nuclear chemistry in the region of heavy and superheavy elements will be promoted. In nuclear physics, experimental 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 nuclear chemistry, to investigate unique electronic structure and chemical bonding in superheavy elements, experiments on aquaus chemistry and gas-phase chemistry, and reaction studies and ionization-energy measurements using ion source, low-energy ion beam, and ion trap will be performed. 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 Radiation Applied Physics Measurements and Instruments Computer and Information Other

No.	36
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.	37
Theme	Research on physical properties of strongly correlated actinide 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, such as spin-triplet superconductivity and nonreciprocal transport. In experimental studies, we advance our research by complementarily utilizing various techniques according to each specific theme, including material synthesis, magnetic and transport property measurements, nuclear magnetic resonance, neutron scattering, muon spin relaxation, and resonant X-ray diffraction. Furthermore, we also have access to advanced microfabrication techniques using the focused ion beam. We actively promote international collaborative research as well.
Radiation Worker/ Non-RadiationWorker	Radiation Worker
Field (for reference）	Physics Material Applied Physics Chemistry

No.	38
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	Nuclear Science Research 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/publist_idx.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.	39
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.	40
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.	41
Theme	Theoretical study of many-body quantun systems
Department	Nuclear Science Research Institute, Advanced Science Reserch Center
Section	Research Group for Advanced Theoretical Physics
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	We invite candidates who will conduct theoretical researches of many-body quantum physics in quark, hadron, or nuclear physics, and the related areas beyond energy scale. The candidates are encouraged to strengthen links to experimental studies in JAEA, and to carry out interdisciplinary researches in terms of the role of basic science in JAEA.
Radiation Worker/ Non-RadiationWorker	Non-Radiation Worker
Field (for reference）	Physics

No.	42
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.	43
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 Research InstituteNuclear Science and Engineering Center
Section	Research Group for Radiation Transport Analysis
Location	Tokai(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.	44
Theme	Research and development on nuclear data
Department	Nuclear Science and Engineering Center, Nuclear Science Research Institute
Section	Nuclear Data Center
Location	Nuclear Science Research Institute
ContactPerson *Replace [at] with @	Osamu Iwamoto Tel : +81-29-282-5480 E-mail : iwamoto.osamu[at]jaea.go.jp
Summary	In order to contribute to research and development of nuclear energy and various uses of radiation toward the realization of a sustainable society, we conduct research on nuclear data related to nuclear reactions and decay, which form the basis of these. For development of 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. (Works on radiation or non-radiation depend on the selected topics.)
Radiation Worker/ Non-RadiationWorker	Radiation Worker
Field (for reference）	Physics Radiation Applied Physics Measurements and Instruments Computer and Information

No.	45
Theme	Development of next-generation radiation measurement technologies and their applications
Department	Nuclear Science Research InstituteNuclear 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 encompasses not only the advancement of radiation measurement technologies, including gamma-ray and neutron detection, but also the application of these technologies across a wide range of fields such as decommissioning, nuclear security, radiation medicine, and the natural sciences. The program places a strong emphasis on fostering originality and flexibility, and encourages endeavors that pursue novel perspectives. Prior experience or specific expertise in the relevant fields is not a prerequisite; rather, applications are invited from early-career researchers who demonstrate a high level of motivation and the ability to work independently and take ownership of their research within this theme.
Radiation Worker/ Non-RadiationWorker	Radiation Worker
Field (for reference）	Radiation Measurements and Instruments Physics Applied Physics Geo and Environemtal Sciences Other

No.	46
Theme	Study on Grain Boundary Oxidation Behavior of Stainless Steel in High-Temperature, High-Pressure Water under Low Oxygen Potential
Department	Nuclear Science and Engineering Center
Section	Research Group for Corrosion Resitant Materials
Location	Nuclear Science Research Institute
ContactPerson *Replace [at] with @	Yasutaka Soma Tel : +81-29-282-6482 E-mail : soma.yasutaka[at]jaea.go.jp
Summary	Since the 2020s, numerous cases of stress corrosion cracking (SCC) of stainless steels in high-temperature, high-pressure water with low oxygen potential have been reported in operating nuclear power plants. Understanding the cracking mechanism has become a key issue for aging management. This study aims to clarify the oxidation behavior at grain boundaries, which is critical for assessing material degradation due to SCC, through corrosion and oxidation tests of stainless steels under simulated plant conditions.
Radiation Worker/ Non-RadiationWorker	Non-Radiation Worker
Field (for reference）	Chemistry Geo and Environemtal Sciences Material Mechanics

No.	47
Theme	Evaluation of nuclear fuel and fission products behaviors toward the enhancement of nuclear safety
Department	Nuclear Science and Engineering Center
Section	Research Group for High Temperature Science on Fuel 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	Our group conducts fundamental research aimed at enhancing the safety and performance of light water reactors, by acquiring basic data, elucidating mechanisms, and modeling the thermophysical properties and behavior of nuclear fuels as well as the behavior of fission products (FPs) during accidents. We are also constructing a database that contributes to the improvement of analysis codes. In this research, the applicant will engage in one of the following topics: the study of the thermophysical properties and irradiation behavior (using simulated irradiated fuel) of new types of high burnup fuel (e.g. doped UO2 fuel), or the study of FP behavior under accident conditions. The applicant will acquire experimental data using uranium and simulated fission products, and develop computational methods to elucidate the relevant mechanisms. This study will be carried out in collaboration with researchers in our group. The specific focus, such as the type of fuel to be studied, can be adjusted based on the applicant’s expertise and interests.
Radiation Worker/ Non-RadiationWorker	Radiation Worker
Field (for reference）	Physics Chemistry Material Computer and Information

No.	48
Theme	Chemical reactions at the solvent extraction interface studied using vibrational sum frequency generation spectroscopy and theoretical chemical calculations
Department	Nuclear Science Research InstituteNucelar Science and Engineering Center
Section	Reserch 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	Despite its crucial role in metal ion transport, our understanding of the chemical reactions occurring at the oil–water interface during solvent extraction remains limited. This research aims to advance our knowledge of these interfacial reactions through two complementary approaches: (1) the development of a vibrational sum frequency generation (VSFG) spectroscopy technique capable of probing the ~1 nm-thick molecular interfacial layer, and (2) the application of theoretical chemical calculations. By elucidating the chemical states present at the interface, we seek to enhance the efficiency and performance of solvent extraction processes.
Radiation Worker/ Non-RadiationWorker	Radiation Worker
Field (for reference）	Chemistry Physics Radiation Measurements and Instruments

No.	49
Theme	Development of a high-sensitivity spectroscopic method for liquid samples of small amount and low-concentration, and its application to analysis of radioactive nuclides.
Department	Nuclear Science Research InstituteNucelar Science and Engineering Center
Section	Reserch Group for Nuclear Chemistry
Location	Nuclear Science Research Institute
ContactPerson *Replace [at] with @	Yuta Kumagai, Tel : +81-29-282-5268 E-mail : kumagai.yuta[at]jaea.go.jp Syuhei Urashima, Tel : +81-29-282-6386 E-mail : urashima.shuhei[at]jaea.go.jp
Summary	High-level radioactive waste, such as spent nuclear fuel, contains diverse elements. To separate and reuse these elements, it is crucial to analyze their chemical states in solution. While absorption spectroscopy plays a vital role in this analysis, conventional absorbance measurements often face a trade-off between sample amount and sensitivity. This limitation makes it challenging to apply these methods to high-level radioactive waste, where trace amounts of individual chemical species are present. This research project aims to develop a novel method capable of sensitively obtaining absorption spectra from nanoliter-scale samples. Furthermore, we will utilize this developed technique to analyze the chemical states of heavy ions within radioactive solutions.
Radiation Worker/ Non-RadiationWorker	Radiation Worker
Field (for reference）	Measurements and Instruments Chemistry

No.	50
Theme	Study on greenhouse gas dynamics and climate change prediction, using radioactive and stable carbon isotope analyses
Department	Nuclear Science and Engineering Center
Section	Research Group for Environmental Science
Location	Nuclear Science Research Institute
ContactPerson *Replace [at] with @	Jun　Koarashi Tel : +81-29-282-5903 E-mail : koarashi.jun[at]jaea.go.jp
Summary	Climate change is one of the greatest threats to human well-being. Global warmig is the main driver of a range of climate change-related phenomena and the main cause of the global warming is the increase in greenhouse gases (GHGs) such as carbon dioxide (CO2) and methane in the atmosphere. Soils are a huge source of CO2 emission and also can play a role as a source and a sink of other GHGs. Therefore, understanding the exchange of GHGs via soils and its response to global warming is essential for predicting Earth's climate in the future. This study aims to reveal mechanisms contolling the GHGs dynamics via soils using radioactive (14C) and stable carbon isotope analyses and to evaluate the climate change-carbon cycle feedback in terrestrial ecosystems using modelling approaches. (https://nsec.jaea.go.jp/ers/environment/envs/index.html)
Radiation Worker/ Non-RadiationWorker	Non-Radiation Worker
Field (for reference）	Geo and Environemtal Sciences Biology Chemistry Measurements and Instruments Computer and Information

No.	51
Theme	Study on the behavior and characteristics of microplastics in the environment
Department	Nuclear Science and Engineering Center
Section	Research Group for Environmental Science
Location	Nuclear Science Research Institute
ContactPerson *Replace [at] with @	Jun　Koarashi Tel : +81-29-282-5903 E-mail : koarashi.jun[at]jaea.go.jp
Summary	Plastic debris is one of the well-known emerging concerns in the global environment. In particular, microplastics (MPs) in the environment have received growing attention because of their harmful effects on the ecosystems. Understanding the behavior and characteristics of MPs in the environment is essential. In this study, we will utilize various analytical techniques owned by JAEA, including isotope analysis, to reveal the interactions of MPs with environmental substances (organic matter, microorganisms, chemical substances, radionuclides, etc.) and their mechanisms. Furthermore, we will incorporate the obtained knowledge into a simulation model to elucidate the migration of MPs from land to the ocean and the true impact of MPs on the ecosystems. (https://nsec.jaea.go.jp/ers/environment/envs/index.html)
Radiation Worker/ Non-RadiationWorker	Non-Radiation Worker
Field (for reference）	Geo and Environemtal Sciences Biology Chemistry Physics Measurements and Instruments Computer and Information

No.	52
Theme	Research and development of smart irradiation technology
Department	Nuclear Science and Engineering Center
Section	Research Group for Radiation Materials Engineering
Location	Nuclear Science Research Institute
ContactPerson *Replace [at] with @	Nariaki Okubo Tel : +81-29-282-6212 E-mail : okubo.nariaki[at]jaea.go.jp
Summary	Materials research for innovative nuclear power systems will be conducted to elucidate the effects of irradiation in the reactor environment on the material properties of fuel claddings used in light water reactor fuel claddings (ATF) and target window materials used in accelerator driven systems (ADS). Microstructural observation, various mechanical tests (tensile, fatigue, creep, etc.), development of micro specimen test technology, etc. will be conducted on materials irradiated under various environmental conditions to evaluate the correlation between microstructural changes and strength property changes, irradiation damage behavior, etc. The superposition effects of environmental factors (thermal load, stress, atmosphere, etc.) and irradiation conditions will be investigated and modeled, and the development of smart irradiation technology that can handle reactor-irradiated materials rationally will be conducted in cooperation with the modeling team in our group.
Radiation Worker/ Non-RadiationWorker	Radiation Worker
Field (for reference）	Material Measurements and Instruments Radiation Mechanics Computer and Information

No.	53
Theme	Research on the behavior of fuel cladding materials to contribute to enhanced accident tolerance.
Department	Nuclear Science and Engineering Center
Section	Research Group for Radiation Materials Engineering
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/index.html)
Radiation Worker/ Non-RadiationWorker	Radiation Worker
Field (for reference）	Material Measurements and Instruments Radiation Mathematics Mechanics Computer and Information

No.	54
Theme	Study on exotic phenomena in strongly correlated electron systems by complementary use of neutrons and synchrotron radiation
Department	Materials Sciences Research Center, Nuclear Science Research Institute, Sector of Nuclear Science Reseach
Section	Strongly Correlated Materials Research Group
Location	Tokai(NSRI)
ContactPerson *Replace [at] with @	Katsuaki　Kodama Tel : +81-29-282-6474 E-mail : kodama.katsuaki[at]jaea.go.jp
Summary	At Materials Sciences Research Center (MSRC), research using neutrons and synchrotron radiation (X-rays) is being conducted in advanced facilities such as the JRR-3 research reactor, the J-PARC high-intensity proton accelerator facility, and the SPring-8 large synchrotron radiation facility, in addition to upgrading research equipment. A successful candidate will study the development of advanced materials based on the elucidation of the correlation between structure and function, especially for novel properties of strongly correlated electron materials, by using these facilities in a complementary manner, with a focus on neutrons. Further, he/she can also develop the neutron scattering technique and data analysis for triple-axis spectrometer, high-resolution powder diffractometer and reflectometer which are owned by our group. We welcome young researchers who are willing to work on such research theme with high motivation, regardless of previous experience and expertise. Publication list : (https://msrc.jaea.go.jp/jp/result/publications/kyousou/) Beam experimental instruments : (https://msrc.jaea.go.jp/jp/device/) Project JAEA "Towards the restarting of the Japan Research Reactor No.3 (JRR-3)" : (https://www.jaea.go.jp/atomic_portal/jaea_channel/40/)
Radiation Worker/ Non-RadiationWorker	Radiation Worker
Field (for reference）	Physics Applied Physics Material Measurements and Instruments

No.	55
Theme	Research contributing to the advancement of engineering materials and related technologies using neutron beams
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 @	Takahisa Shobu Tel : +81-80 4904-2775 E-mail : shobu.takahisa[at]jaea.go.jp
Summary	Various advanced application studies are being conducted at the Materials Sciences Research Center using neutrons and synchrotron radiation (X-rays) as well as technical upgrading of large-scale advanced instruments at the Japan Research Reactor No.3 (JRR-3), the Japan Proton Accelerator Research Complex (J-PARC), and the Synchrotron Radiation Facilities (SPring-8). In this theme, we will engage in various application studies contributing to the advancement of materials and related technologies related to the optimization control of engineering material processes, the preservation of food materials and pharmaceuticals, and the radioactive waste disposal and recycling by maximizing the scientific merits of the neutron beam from JRR-3, and also contribute to the broadening of neutron application fields through R&D activities on improved intensity and time efficiency of neutron measurement technology. Young researchers who can work with enthusiasm and initiative are welcome to apply, regardless of their previous experience or expertise. Publication list: (https://msrc.jaea.go.jp/jp/result/publications/kaiso/) Beam experimental instruments : (https://msrc.jaea.go.jp/jp/device/) Project JAEA "Towards the restarting of the Japan Research Reactor No.3 (JRR-3)" : (https://www.jaea.go.jp/atomic_portal/jaea_channel/40/)
Radiation Worker/ Non-RadiationWorker	Radiation Worker
Field (for reference）	Mechanics Material Applied Physics Measurements and Instruments Chemistry Radiation Architectural and CivilEngineering

No.	56
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	Synchrotron Radiation Facilities (SPring-8). In this research theme, we will engage in research that contributes to the advancement of separation technology for recycling metal resources and recycling radioactive waste by maximizing the characteristics of the neutron beam from JRR-3, as well as R&D related to the advancement of neutron scattering technology. It is preferable that the applicant has previous research experience in separation and recycling, but experience and expertise are not required as long as the applicant is a young researcher who can work on this theme with enthusiasm and initiative. Publication list: (https://msrc.jaea.go.jp/en/research/kaiso/) Beam experimental instruments：(https://msrc.jaea.go.jp/jp/device/index.html) Beam line：(https://msrc.jaea.go.jp/jp/device/sans-j_pno/index.html)
Radiation Worker/ Non-RadiationWorker	Radiation Worker
Field (for reference）	Chemistry Physics Applied Chemistry Measurements and Instruments Material Chemical Engineering

No.	57
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[at]spring8.or.jp
Summary	Materials Sciences Research Center focuses on developing experimental techniques utilizing JAEA's beamlines, BL22XU and BL23SU, at SPring-8. These efforts are aimed at advancing materials science research conducted with these beamlines. Our research encompasses the use of cutting-edge techniques, including soft X-ray angle-resolved photoemission spectroscopy (ARPES), scanning transmission X-ray microscopy (STXM), and providing support for synchrotron radiation users. This position entails upgrading and maintaining the aforementioned equipment, as well as assisting users of synchrotron radiation facilities. While prior experience in this field is preferred, we welcome young researchers who are eager to embrace new challenges. https://msrc.jaea.go.jp/en/result/publications/actinoid/ https://arim.jaea.go.jp/eng/device.html 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.	58
Theme	Valence state analysis of debris and environmental samples from Fukushima Daiichi Nuclear Power Plant using a high-energy x-ray microbeam
Department	Materials Sciences Research Center, Nuclear Science Research Institute
Section	Synchrotron Radiation Research Group
Location	Harima, Hyogo
ContactPerson *Replace [at] with @	Hajime Tanida Tel : +81-80-4903-5984 E-mail : tanida.hajime[at]jaea.go.jp
Summary	Materials Sciences Research Center focuses on developing experimental techniques utilizing JAEA's beamlines, BL22XU and BL23SU, at SPring-8. These efforts are aimed at advancing materials science research conducted with these beamlines. A wide variety of elements contained in environmental samples such as radioactive particulates and nuclear fuel debris originated from the Fukushima Daiichi Nuclear Power Plant, and vitrified materials have been measured using high-energy X-ray microbeam focusing mirrors installed at the JAEA's beamline BL22XU at SPring-8 to perform elemental mapping and valence mapping measurements in the same field of view over a wide energy range from the Ca K edge to the Ce K edge without changing the focusing beam setting. The development and study of methods to analyse the chemical state of heterogeneous samples is performed in order to elucidate the origin of their formation and stability. Any enthusiastic young researcher is welcome to join this project, regardless of previous experience or expertise. https://msrc.jaea.go.jp/en/result/publications/actinoid/ https://arim.jaea.go.jp/eng/device.html https://arim.jaea.go.jp/eng/beamline.html
Radiation Worker/ Non-RadiationWorker	Radiation Worker
Field (for reference）	Geo and Environemtal Sciences Measurements and Instruments Chemistry Radiation Physics

No.	59
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 : daiju[at]spring8.or.jp
Summary	Materials Sciences Research Center focuses on developing experimental techniques utilizing JAEA's beamlines, BL22XU and BL23SU, at SPring-8. These efforts are aimed at advancing materials science research conducted with these beamlines. In this research theme, using X-ray absorption spectroscopy measurement system at large synchrotron radiation facility SPring-8, we will advance research about energy conversion materials such as fuel cell electrode catalysts, automobile exhost catalysts, solar cells, and radiation power generation elements. Based on the structural and electronic information of the materials during the reaction of materials, 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. https://msrc.jaea.go.jp/en/result/publications/energy/ https://arim.jaea.go.jp/eng/device.html 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.	60
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	To implement safety assessment for demonstration reactor of sodium-cooled fast reactor (SFR) in Japan, JAEA has developed level 1 to 3 Probabilistic Risk Assessment (PRA) methods of internal and external events for SFRs by utilizing international cooperation. The purpose of this theme is to construct PRA models to quantify frequency of core damage induced by the internal or external events (e.g., internal fire, earthquakes), and is to obtain risk information for safety design of the demonstration reactor by quantification of the PRA models. To carry out the purpose, there are a variety of topics as follows; (i) development of evaluation methods for occurrence probabilities of headings (i.e., phenomenalistic events in reactor vessel after core damage) defined in event trees of level 2 PRA, (ii) development of fragility evaluation methods of important components for decay heat removal against seismic event, (iii) development of PRA method against internal fire, etc. for SFRs. Applicants for this theme can discuss the topics with contact person and select the interested topics.
Radiation Worker/ Non-RadiationWorker	Non-Radiation Worker
Field (for reference）	Physics Mathematics Radiation Mechanics

No.	61
Theme	R&D on Numerical Analysis Methodology of Core Material Relocation Behavior during Severe Accidents of Fast Reactors
Department	Fast Reactor Research and Development Department
Section	Fast Reactor Safety Engineering Group
Location	Oarai Nuclear Engineering Institute
ContactPerson *Replace [at] with @	Kenichi MATSUBA Tel : +81-29-267-4141 (ext.6452) E-mail : matsuba.kennichi[at]jaea.go.jp
Summary	In this theme, a numerical simulation code, such as the SIMMER code (a multi-dimensional, multi-velocity field, multiphase, multicomponent, Eulerian, fluid dynamics code coupled with a space and energy dependent neutron kinetics module and a structure model) is utilized. In this simulation, analyses of experimental data on core material relocation behavior during severe accidents of fast reactors are performed to validate and improve analytical models implemented in the code.
Radiation Worker/ Non-RadiationWorker	Non-Radiation Worker
Field (for reference）	Physics Mechanics Computer and Information

No.	62
Theme	R&D on Numerical Analysis Methodology of Mechanical Source Term for Fast Reactor Systems
Department	Fast Reactor Research and Development Department
Section	Fast Reactor Safety Engineering Group
Location	Oarai Nuclear Engineering Institute
ContactPerson *Replace [at] with @	Yasushi OKANO Tel : +81-29-267-4141 (ext.6700) E-mail : okano.yasushi[at]jaea.go.jp
Summary	In this theme, a numerical simulation code related to the mechanical source term is utilized for fast reactor systems. In this simulation, physical, chemical, and transport phenomena of radioactive materials in the reactor coolant system and the reactor vessel are performed by developing numerical modeling of such phenomena through benchmark analysis. It is highly expected for the applicant to have knowledge of physics, chemistry, mechanics, and/or numerical analysis.
Radiation Worker/ Non-RadiationWorker	Non-Radiation Worker
Field (for reference）	Physics Chemistry Mechanics Computer and Information

No.	63
Theme	R&D on Dynamic PRA for Fast Reactor Systems
Department	Fast Reactor Research and Development Department
Section	Fast Reactor Safety Engineering Group
Location	Oarai Nuclear Engineering Institute
ContactPerson *Replace [at] with @	Yasushi OKANO Tel : +81-29-267-4141 (ext.6700) E-mail : okano.yasushi[at]jaea.go.jp
Summary	In this theme, R&D on dynamic PRA (Probabilistic Risk Assessment) is performed. Reactor plant dynamics is simulated as a part of PRA, where numerical modeling of fast reactor systems and statistical analysis is performed. It is highly expected for the applicant those have knowledge of thermal-hydraulics, mechanics, and/or numerical 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&D on sophistication of radiometric dating methods for natural phenomena
Department	Tono Geoscience Center
Section	Geochronology Research Group
Location	Tono
ContactPerson *Replace [at] with @	Takahiro Hanamuro Tel : +81-572-0211 E-mail : hanamuro.takahiro[at]jaea.go.jp
Summary	We will develop radiometric dating methods for geological samples, which are essential for research on the long-term stability of the geological environment within the research and development of geological disposal technology. Research on the long-term stability of the geological environment requires accurate understanding of the timing of past fault movements and volcanic activity, trends and rates of uplift and erosion. This research and development will focus on enhancing radiometric dating methods, chemical analysis techniques, and physical measurement technologies applied to geological samples related to these natural phenomena. (If necessary, radiation worker registration will be conducted to proceed with the research.)
Radiation Worker/ Non-RadiationWorker	Radiation Worker
Field (for reference）	Measurements and Instruments Geo and Environemtal Sciences Chemistry Physics