Recruitment for Postdoctoral Fellow
(Fixed-term researcher)

1. Physics	Chemistry	Mathematics	Geo and Environemtal Sciences	Biology	Radiation
   Mechanics	Material	Electricity and Electronics	Architectural and Civil Engineering	Applied Physics	Applied Chemistry
   Chemical Engineering	Measurements and Instruments	Computer and Information	Robotics	Other	All

2. No	Theme
   	Department	Section	Location	Contact Person	Radiation Worker/ Non-Radiation Worker	Field (for reference）
   	Summary
   J3	Study on feasibility and effectiveness evaluation for severe accident countermeasures
   	Nuclear Safety Research Center	Severe Accident Analysis Research Group	Tokai Research and Development Center Nuclear Science Research Institute	Tomoyuki Sugiyama Tel:+81-29-282-5253 E-mail: sugiyama.tomoyuki@jaea.go.jp	Non-Radiation Worker	Physics Chemistry Mechanics Material Applied Physics Computer and Information Other
   	This research aims at development of analysis models and tools to improve evaluation techniques of severe accident countermeasures. One of the following tasks or that related to the tasks is carried out. - Source term analysis of Fukushima daiichi NPS accident using the SA analysis code THALES2/KICHE. - Analysis of fluid dynamic behaviors of core melt in containment vessel using the mechanistic FCI code JASMINE. - Analysis of thermal-hydraulic and deflagration/detonation behaviors of hydrogen in containment vessel or reactor building using the open CFD code OpenFOAM.
   J4	Study on the methodology of the structural integrity assessment for nuclear reactor components
   	Nuclear Safety Research Center	Structural Integrity Research Group	Tokai Research and Development Center Nuclear Science Research Institute	Yinsheng Li Tel:+81-29-282-6457 E-mail: li.yinsheng@jaea.go.jp	Non-Radiation Worker	Mechanics Material Applied Physics Physics Architectural and Civil Engineering Computer and Information
   	Because of the ageing degradation due to long term operation for Japanese nuclear power plants, developing the methodologies of structural integrity assessments for the reactor components concerning neutron irradiation, stress corrosion cracking and so on is of great importance. In this theme, researches on the deterministic approaches such as weld residual stress evaluation, crack propagation evaluation under large scale yielding condition, fracture evaluation concerning the crack or thinning for nuclear components are conducted on the basis of numerical simulation, material testing, and fracture testing and so on. In addition, probabilistic fracture mechanics analysis codes concerning ageing degradation of nuclear components are developed on the basis of the knowledge obtained from simulation and testing.
   J9	Study on analytical techniques for individual particles containing nuclear materials in environmentl samples
   	Nuclear Safety Research Center	Research Group for Safeguards Analytical Chemisty	Tokai Research and Development Center Nuclear Science Research Institute	Fumitaka Esaka Tel:+81-29-282-6165 E-mail: esaka.fumitaka@jaea.go.jp	Radiation Worker	Chemistry Physics
   	Analysis of trace amounts of nuclear materials in environmental samples taken at nuclear facilities in the world is performed to reveal nuclear activities, which is important for nuclear non-proliferation. In this study, analytical techniques for such samples are developed. For example, in order to clarify elemental composition, chemical states and isotopic composition, individual micron-sized particles containing uranium and/or plutonium are measured by using scanning electron microscopy, total-reflection X-ray analysis, micro-Raman spectroscopy and secondary ion mass spectrometry.
   J10	Study on a Level 3 Probabilistic Risk Analysis of nuclear power plants
   	Nuclear Safety Research Center	Radiation Risk Analysis Research Group	Tokai Research and Development Center Nuclear Science Research Institute	Masanori Kimura Tel:+81-29-282-5459 E-mail: kimura.masanori@jaea.go.jp	Non-Radiation Worker	Physics Chemistry Mathematics Geo and Environemtal Sciences Radiation Architectural and Civil Engineering Computer and Information
   	A level 3 probabilistic risk assessment (PRA) is an offsite consequence analysis for a severe accident and estimates the frequency and severity of the consequences to the public. Probabilistic accident consequence assessment models and computer codes are an integral part of level 3 PRA of nuclear power plants. Our research group has developed a level 3 PRA code, OSCAAR. In this theme, researches on the probabilistic accident consequence assessment for health effects and economic consequence are conducted considering site-dependent on metrological, population, agricultural and economic data by using OSCAAR.
   J11	Study on release and transport behavior of radioactive materials in reprocessing plant under severe accident conditions
   	Nuclear Safety Research Center	Fuel Cycle Safety Research Group	Tokai Research and Development Center Nuclear Science Research Institute	Hitoshi Abe Tel:+81-29-282-6672 E-mail: abe.hitoshi@jaea.go.jp	Non-Radiation Worker	Chemistry Physics
   	Newly defined as 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. Therefore, 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.
   J12	Study on the volcanic activity evaluation in a geological radioactive waste disposal
   	Nuclear Safety Research Center	Environmental Safety Research Group	Tokai Research and Development Center Nuclear Science Research Institute	Seiji Takeda Tel:+81-29-282-6170 E-mail: takeda.seiji@jaea.go.jp	Non-Radiation Worker	Applied Chemistry Physics Geo and Environemtal Sciences Measurements and Instruments
   	In a safety assessment of geological radioactive waste disposal, it is necessary to estimate the environmental impact at the site due to occurrence of natural phenomenon such as a volcanic activity, an earthquake and fault activity. In this theme, the research on the volcanic activity evaluation characterized by magma residence time, accumulated volume and temporal distribution of magma is conducted, in order to estimate the thermal and/or geochemical effects of a disposal site by a volcanic activity.
   J13	Research on Criticality Safety/Management of Damaged- or Molten-Fuel formed by Severe Accidents
   	Nuclear Safety Research Center	Criticality Safety Research Group	Tokai Research and Development Center Nuclear Science Research Institute	Kotaro Tonoike Tel:+81-29-284-3762 E-mail: tonoike.kotaro@jaea.go.jp	Radiation Worker	Physics Computer and Information Applied Physics Other
   	It is important to establish both the cooling and the criticality control of fuel debris after the severe accident, such as the Fukushima Daiichi accident, where large amount of fuel is damaged and melts. It is difficult, however, to control the situation of fuel debris and the coolant flow path, which leads the difficulty in securing the subcritical condition. Thus, the evaluation of re-criticality risk is necessary. In this research, critical mass, kinetic parameters, etc. of fuel debris will be obtained by computation; and critical experiments to validate the computation will be studied as well.
   J14	Nuclear reaction and structure study for exotic nuclei
   	Sector of Nuclear Science Research Advanced Science Research Center	Research Group for Heavy Element Nuclear Science	Tokai Research and Development Center Nuclear Science Research Institute	Katsuhisa Nishio Tel:+81-29-282-5454 E-mail: nishio.katsuhisa@jaea.go.jp	Radiation Worker	Physics Applied Physics Mathematics Measurements and Instruments Other
   	Experimental nuclear physics programs dedicated to exotic nuclei such as neutron-rich, proton-rich and super-heavy nuclei will be promoted. Challenge to find a new phenomenon in nuclear structure, nuclear reaction and fission processes will be highly encouraged. Experiments will be carrieod out using JAEA facility and also other facilities inside and outside Japan to produce exotic nuclei and unique states in nuclei. (http://asrc.jaea.go.jp/soshiki/gr/HENS-gr/index_e.html)
   J15	Chemical properties of superheavy elements
   	Sector of Nuclear Science Research Advanced Science Research Center	Research Group for Heavy Element Nuclear Science	Tokai Research and Development Center Nuclear Science Research Institute	Kazuaki Tsukada Tel:+81-29-282-5491 E-mail: tsukada.kazuaki@jaea.go.jp	Radiation Worker	Chemistry Physics Measurements and Instruments
   	The main objective is to understand chemical properties of superheavy elements (SHEs) placed at the uppermost end of the Periodic Table. This theme will focus on the valence electronic structure of SHEs that is experimentally evaluated from their redox potentials, ionic radii, and compound formations as well as the development of chemical analysis methods for SHEs on an "atom-at-a-time" basis. （http://asrc.jaea.go.jp/soshiki/gr/HENS-gr/nc/index-e.htm）
   J16	Physics and chemistry studies for superheavy elements by using slow superheavy-element beams
   	Sector of Nuclear Science Research Advanced Science Research Center	Research Group for Heavy Element Nuclear Science	Tokai Research and Development Center Nuclear Science Research Institute	Masato Asai Tel:+81-29-282-5490 E-mail: asai.masato@jaea.go.jp	Radiation Worker	Physics Chemistry Radiation Measurements and Instruments
   	Nuclear physics, nuclear chemistry, and atomic and molecular physics of superheavy elements are studied through developments of new methods utilizing slow superheavy-element beams. The research subjects are as follows: developments of superheavy-element-beam production and ion-guide techniques; ionization-energy measurements; nuclear-structure and fission studies using an on-line isotope separator; nuclear mass measurements; surface adsorption and molecular formation studies for superheavy elements. These developments and experiments are mainly performed at the JAEA Tandem Accelerator Facility.
   J18	Hadron and Nuclear Physics at J-PARC
   	Sector of Nuclear Science Research Advanced Science Research Center	Research Group for Hadron and Nuclear Physics	Tokai Research and Development Center Nuclear Science Research Institute	Hiroyuki Sako Tel:+81-29-284-3113 E-mail: sako.hiroyuki@jaea.go.jp	Radiation Worker	Physics
   	The successful candidate will work on either experimental or theoretical research of hadron and nuclear physics at J-PARC. The experimental research includes R&D of a fast DAQ system for J-PARC Heavy-Ion Program and experimental studies with the kaon beamlines or the high momentum beamline at J-PARC. The theoretical research includes hadron and nuclear physics related to J-PARC, and promotion of international theoretical research activities.
   J19	Electronic property of heavy element systems
   	Sector of Nuclear Science Research Advanced Science Research Center	Research Group for Materials Physics for Heavy Element Systems	Tokai Research and Development Center Nuclear Science Research Institute	Shinsaku Kambe Tel:+81-29-284-3525 E-mail: kambe.shinsaku@jaea.go.jp	Radiation Worker	Physics Applied Physics Material
   	Condensed matter physics in heavy element systems. Particularly magnetism and superconductivity in f-electron compounds.
   J20	Theoretical study on spin-energy transformation materials
   	Sector of Nuclear Science Research Advanced Science Research Center	Research Group for Spin-energy Transformation Science	Tokai Research and Development Center Nuclear Science Research Institute	Michiyasu Mori Tel:+81-29-284-3508 E-mail: mori.michiyasu@jaea.go.jp	Non-Radiation Worker	Physics Mathematics Material
   	A successful candidate will theoretically study spin- and thermal-transport properties using some numerical techniques such as density functional theory, density matrix renormalization group method, quantum Monte Carlo method and so on. Thermoelectric materials, primarily related to spin Seebeck effect, and radiation-proof devices will be also important subjects of candidate.
   J21	Materials science research by using a muon beam
   	Sector of Nuclear Science Research Advanced Science Research Center	Research Group for Nanoscale Structure and Function of Advanced Materials	Tokai Research and Development Center Nuclear Science Research Institute	Wataru Higemoto Tel:+81-29-284-3873 E-mail: higemoto.wataru@jaea.go.jp	Radiation Worker	Physics Chemistry Material Applied Physics Applied Chemistry Measurements and Instruments
   	The applicant will be involved in materials science research by using accelerator-produced muons, which are implanted into a material and used as a sensitive local probe. In our group, the applicant will be able to use advanced muon beams, such as an ultra-slow muon beam in J-PARC, to investigate various functional materials. Instrumentation is also encouraged for the purpose. (http://asrc.jaea.go.jp/soshiki/gr/Nanoscale-gr/index.html)
   J23	Study on Accurate Neutron Cross Section Measurement
   	Nuclear Science and Engineering Center	Nuclear Data Center, Nuclear Data and Reactor Engineering Division	Tokai Research and Development Center Nuclear Science Research Institute	Atsushi Kimura Tel:+81-29-282-5796 E-mail: kimura.atsushi04@jaea.go.jp	Radiation Worker	Physics Measurements and Instruments
   	Accurate nuclear data for minor actinides (MAs) and long-lived fission products (LLFPs) are required for the development of nuclear transmutation systems, since present uncertainties are large. In order to decrease the uncertainties of the cross sections, we have been carrying out neutron-TOF experiments using ANNRI installed at BL04/MLF/J-PARC and other facilities. The assigned post-doc fellow is requested to perform one or more topics from; 1) Capture, fission and total cross-section measurements with neutron-TOF method, 2) Calculation of the detector weighting function in ANNRI, 3) Resonance analysis of the obtained cross sections.
   J25	Evaluation of correlation between changes in microstructure and mechanical properties in irradiated materials (metal, steel, and ceramics)
   	Nuclear Science and Engineering Center	Research Group for Radiation Materials Engineering, Fuels and Amterials Engineerign Division	Tokai Research and Development Center Nuclear Science Research Institute	Shinichiro Yamashita Tel:+81-29-282-5391 E-mail: yamashita.shinichiro@jaea.go.jp	Radiation Worker	Radiation Material Physics Mechanics
   	In order to increase safety and integrity in existing and future nuclear power plants, micrstructural observation and a wide variety of mechanical strength tests (tensile, hardness measurement, and toughness etc) of nuclear reactor component materials such as structural material and simulated fuel-like oxide irradiated at various environmental conditions will be performed. Based on the experimental data acquired, a correlation between changes in microstructure and mechanical properties in the materials will be evaluated. In addition to that, it is possible to conduct fundamental study on radiation damage for the materials. Through these works, it is expected that synergistic function among environmental factors (irradiation, thermal load, stress, atmosphere etc) influencing on correlation evaluation for those materials will be clarified, contributing increment of safety and integrity in the existing/future nuclear power plants.
   J27	Research and development of non-destructive analysis for nuclear materials.
   	Nuclear Science and Engineering Center	Research Group for Nuclear Sensing, Nuclear Data and Reactor Engineering Division	Tokai Research and Development Center Nuclear Science Research Institute	Yosuke Toh Tel:+81-29-282-6211 E-mail: toh.yosuke@jaea.go.jp	Radiation Worker	Measurements and Instruments Physics Radiation Applied Physics
   	Non-destructive analysis of nuclear materials is required in many fields, namely nuclear non-proliferation and nuclear security, nuclear decommissioning, nuclear transmutation and nuclear industry. In this research, non-destructive techniques of nuclear materials and long-lived radioisotopes, which are difficult to quantify by conventional methods, are developed by combining several method, such as neutron and gamma-ray detection and imaging techniques.
   J28	Research and Development of Evaluation Method for Core Degradation and Release of Radioactive Materials at LWR Accident
   	Nuclear Science and Engineering Center	Develppment Group for Thermal-Hydraulics Technology, LWR Key Technology Development Division	Tokai Research and Development Center Nuclear Science Research Institute	Hiroyuki Yoshida Tel:+81-29-282-5275 E-mail: yoshida.hiroyuki@jaea.go.jp	Radiation Worker	Physics Chemistry Material Mechanics
   	A coupled analysis method of thermal-hydraulics and chemical reaction is developed to evaluate core degradation and release of radioactive materials in Light Water Reactor (LWR) accidents in this study. In detail, numerical methods and models simulating thermal-hydraulic behavior with chemical reactions are developed to solve melting of nuclear fuel and metals, release of radioactive materials and relocation of molten and released materials. In addition, new thermal-hydraulic and chemical reactions experiments are performed to validate developed methods and models. By developing this method, basic knowledge to understand multi-physics phenomena at LWR accidents is obtained, and numerical models for severe accident analysis codes are improved.
   J30	Study of Performance Improvement for the J-PARC Accelerators
   	Sector of Nuclear Science Research, J-PARC Center	Accelerator Division	J-PARC	Michikazu Kinsho Tel:81-29-284-3172 E-mail: kinsho.michikazu@jaea.go.jp	Radiation Worker	Physics Applied Physics Radiation Electricity and Electronics Measurements and Instruments
   	The goal of the J-PARC proton accelerators is to achieve stable beam operation at 1 MW. Beam loss reduction is crucial to increase beam power and to achieve stable operation. And also, long-lasting components are important for reliable operation. The subject of this theme is to study beam loss reduction for the J-PARC linac and/or 3 GeV Synchrotron (RCS). He/she will perform a study of beam diagnostics, beam loss handling and component development for stabler operation.
   J33	Development of lead-bismuth spallation target
   	Sector of Nuclear Science Research, J-PARC Center	Nuclear Transmutation Division Target Technology Development Section	J-PARC	Toshinobu Sasa Tel:+81-29-282-5364 E-mail: sasa.toshinobu@jaea.go.jp	Non-Radiation Worker	Physics Material Measurements and Instruments Robotics Computer and Information
   	JAEA plans to build Transmutation Experimental Facility (TEF) to realize innvative accelerator-driven systen (ADS) for transmutation of long-lived radioactive nuclides. R&Ds to install a 250kW lead-bismuth spallation target in TEF for material irradiation, such as simulation of neutronic- and thermal-hydraulic performance, development of target components and instruments, and remote handling systems, will be performed.
   J34	Development and application of spin-contrast variation technique on structual study of complex materials using polarized neutron and polarized protons
   	Materials Sciences Research Center	Hierarchical Structure Research Group	Tokai Research and Development Center Nuclear Science Research Institute	Takayuki Kumada Tel:+81-29-284-3834 E-mail: kumada.takayuki@jaea.go.jp	Radiation Worker	Measurements and Instruments Physics Electricity and Electronics Mathematics Chemistry
   	Scattering power of protons against neutrons remarkably depends on relative direction of spins of the protons and neutrons. We have developed a dyanamic nuclear polarization system for the proton polarization of composite materials, and then carried out polarized neutron scattering study to determine detailed structure of the materials. We will extend this technique named spin contrast variation to deterimine nano-scale bulk and surface structures using small-angle scattering diffractometers and reflectrometers at the neutron facilities, JRR-3 and J-PARC.
   F1	Computational study on the chemical form of radionuclides in environment and their transport
   	Center for Computational Science & e-Systems	Simulation technology R&D Office	178-4-4 Wakashiba, Kashiwa, Chiba, 277-0871, Japan	Masahiko Machida Tel:+81-04-7135-2349 E-mail: machida.masahiko@jaea.go.jp	Non-Radiation Worker	Physics Geo and Environmental Sciences Computer and Information Chemistry
   	The transport of radioactive Cesium and other radionuclides in the environment (including soil, rivers, coastal area and other environment) widely varies depending on the surroundings. These variation mainly originates from changes in the chemical and physical form of substances which absorb the radionuclides, such as soil particles and organic polymers of biological origin. Thus comprehensive evaluation of the transport of radionuclides in various environment requires development of transport model that incorporates the effects of different circumstances, based on the bottom-up modeling framework from the atomistic and molecular level up to the mesoscopic and macroscopic scales. The applicant is supposed to develop the modeling framework and simulation codes for the evaluation of transport of radionuclides that incorporates the change of physical and chemical form of radionuclides in various circumstances, to clarify the overall transport of Cesium and other radionuclides in Fukushima environment.
   F2	Development of evaluation method of dose rate distribution in primary containment vessel of the Fukushima Daiichi Nuclear Power Station
   	Collaborative Laboratories for Advanced Decommissioning Science (CLADS), Sector of Fukushima Research and Development	Dose Evaluation and Nuclear Material Accountancy Group Fuel Debris Handling and Analysis Division	Tokai Research and Development Center (Nuclear Science Research Institute)	Keisuke Okumura Tel:+81-(0)29-282-5840 E-mail: okumura.keisuke@jaea.go.jp	Non-Radiation Worker	Physics Geo and Environemtal Sciences Measurements and Instruments
   	In order to contribute to planning of fuel debris retrieval, we develop the evaluation method of the most possible dose rate distribution in the primary containment vessel (PCV) by using information obtained from irradiation calculations of fuels and structural materials, severe accident analyses, local dose rate measurement in PCV with robots, and so on.
   F3	Research on severe accident progression behavior of the Fukushima Daiichi NPP accident
   	Collaborative Laboratories for Advanced Decommissioning Science (CLADS), Sector of Fukushima Research and Development	Molten Core Behavior Analysis Group Severe Accident Propagation Behavior Evaluation Division	Tokai Research and Development Center (Nuclear Science Research Institute)	Toshio Nakagiri Tel:+81-(0)29-267-1919, Ex.5802 E-mail: nakagiri.toshio@jaea.go.jp	Non-Radiation Worker	Physics Chemistry Radiation Mechanics Material Measurements and Instruments Computer and Information
   	Analytical evaluation using SA codes (SCDAP, MELCOR, etc.) and 1F plant data are peroformed to enhance understanding on accident progression behavior in the Fukushima Daiichi NPP. In this theme, evaluation of 1F plant data with SA code analysis will be conducted and possibility of model improvement will be considered where appropriate.
   F4	Research on the degradation behavior of fuel assemblies in Fukushima Daiichi NPP accident condition
   	Collaborative Laboratories for Advanced Decommissioning Science (CLADS), Sector of Fukushima Research and Development	Molten Core Behavior Analysis Group Severe Accident Propagation Behavior Evaluation Division	Tokai Research and Development Center (Nuclear Science Research Institute)	Toshio Nakagiri Tel:+81-(0)29-267-1919, Ex.5802 E-mail: nakagiri.toshio@jaea.go.jp	Non-Radiation Worker	Physics Chemistry Mechanics Material Measurements and Instruments
   	Present knowledge on reaction behavior of the fuel assembly materials (control blade, fuel rod, channel box) is insufficient to understand degradation behavior of fuel asseblies in the Fukushima Daiichi NPP accident. In this theme, laboratory scale experiments on reaction behavior of fuel assembly materials, large scale experiments on the degradation behavior of fuel assemblies and development of individual reaction models will be performed.
   F6	R&Ds on Radiation Imaging Technologies under High-dose Environments
   	Collaborative Laboratories for Advanced Decommissioning Science (CLADS), Sector of Fukushima Research and Development	Radiation Imaging and Instrument Group Remote System and Sensing Technology Division	Tokai Research and Development Center (Nuclear Science Research Institute) or Tomioka International Collaborative Research Building (now under constructing)	Jun Saegusa Tel:+81-(0)29-282-6144 E-mail: saegusa.jun@jaea.go.jp	Radiation Worker	Physics Radiation Computer and Information Electricity and Electronics Applied Physics Measurements and Instruments
   	For the decommissioning of TEPCO Fukushima Daiichi Nuclear Power Plants, gamma-ray detectors that can estimate the position, shape and nuclide distributions of residual debris are to be developed. In particular, a prototype detection system consisting of two-dimensional-gamma-imaging units and compact scintillator crystals is developed for the application to fuel debris measurements, and response characteristics of each element to gamma-rays are evaluated. In addition, a compact/lightweight gamma-camera is to be manufactured for the evaluation of its detection capability to radioactive materials and of durability against radiations. An unmanned remote radiation measurement system for the imaging of the radioactivity distribution in the Fukushima reactor building are also to be developed.
   F7	R&Ds on Image Processing Technologies for Radiation Measurement Data on Reactor Decommissioning
   	Collaborative Laboratories for Advanced Decommissioning Science (CLADS), Sector of Fukushima Research and Development	Radiation Imaging and Instrument Group Remote System and Sensing Technology Division	Tokai Research and Development Center (Nuclear Science Research Institute) or Tomioka International Collaborative Research Building (now under constructing)	Jun Saegusa Tel:+81-(0)29-282-6144 E-mail: saegusa.jun@jaea.go.jp	Non-Radiation Worker	Computer and Information Radiation Physics Mathematics Applied Physics Measurements and Instruments
   	Towards the planned removal of fuel debris from the TEPCO Fukushima Daiichi Nuclear Power Plants in 2021, reduction of radiation doses to workers and countermeasures against the spreading of radioactive contaminations are essential. For the purpose, three-dimensional visualization (mapping) of dose rates and radionuclide distributions are required as well as the real time monitoring of dose rates in the reactor building. So far, developments on radiation measurement techniques in the Fukushima Daiichi NPPs are in progress, and results obtained from these developments are to be visualized by the proposed R&Ds. Especially, developments of the algorithm for the three-dimensional image reconstruction is to be performed.
   F8	Research on alteration and leaching of molten fuel
   	Collaborative Laboratories for Advanced Decommissioning Science (CLADS), Sector of Fukushima Research and Development	Fuel Debris Characterization and Conditioning Technology Development Group Fuel Debris Handling and Analysis Division	Tokai Research and Development Center (Nuclear Fuel Cycle Engineering Laboratories)	Hideki Ogino Tel:+81-29-282-1126 E-mail: ogino.hideki@jaea.go.jp	Non-Radiation Worker	Physics Material Chemical Engineering Chemistry Geo and Environemtal Sciences Radiation Computer and Information
   	The work on fuel debris removal from the damaged reactors at Fukushima Daiichi NPP requires a considerably long time. Considering long-term removal work and the subsequent processes such as storage, treatment and disposal, alteration of fuel debris should be evaluated . Although it is anticipated that alteration of fuel debris can be developed by external environments such as air, water and radiation (e.g., the conversion of debris surfaces into powder form and elution into the water), there is little knowledge about alteration. In this research, the alteration and leaching behavior of fuel debris will be evaluated and their models will also be developed based on the knowledge about the alteration of Chernobyl LFCM and the disposal technologies of spent fuel and vitrified waste, etc.
   F9	Research for 3D visualization of environmental radiation distribution
   	Sector of Fukushima Research and Development, Fukushima Environmental Safety center	Fukushima Radiation measurement Group,	Minami-soma(Environmental Radiation Monitoring Centre)	Yukihisa Sanada Tel:+81-244-25-2072 E-mail: sanada.yukihisa@jaea.go.jp	Non-Radiation Worker	Physics Geo and Environemtal Sciences Measurements and Instruments
   	In FukushimaEnvironmental radiation monitoring centre, radiation monitoring system using unmanned vehicle was developed for environmental radiation monitoring. We recruit a postdoctoral fellow who can demonstrate his/her ability for development of 3D tecqnique of visualization results of environmental radiation monitoring based on image reconstruction tecqnique using PET. So, it is desirable that applicants have knowledge of a radiation and the computer language.
   F12	High-energy gamma-rays accompanied by fission
   	Sector of Nuclear Science Research Advanced Science Research Center	Research Group for Heavy Element Nuclear Science	Tokai Research and Development Center Nuclear Science Rsearch Institute	Dr. Katsuhisa Nishio Tel:+81-29-282-5454 E-mail: nishio.katsuhisa@jaea.go.jp	Radiation Worker	Physics Radiation Measurements and Instruments Applied Physics Computer and Information
   	Measurement of high-energy gamma-rays accompanied by fission will be carried out, and the mechanism of this radiation will be investigated. The main goal is to use this radiactivity to monitor the criticality of nuclear fuel debris of damaged Fukushima atomic power plants, which is necessary in the process of decommissioning. An experiment will be carried out using neutron beam supplied by a research reactor. Fission study is also the scope of this program using heavy-ion beams and and photons.
   F15	Investigation of the characteritics of radioactive material in a severe accident condition
   	Nuclear Science and Engineering Center	Research Group for LWR Advanced Technology LWR Key Technology Development Division	Tokai Research and Development Cente (Nuclear Science Research Institute)	Masahiko Osaka Tel:+81-29-267-4141 E-mail: ohsaka.masahiko@jaea.go.jp	Radiation Worker	Physics Chemistry Material Mechanics
   	In order to acquire fundamental knowledge on fission product (FP) behavior and dose evaluation for the decommissioning of Fukushima Daiich Nuclear Power Station, we are investigating the behavior of radioactive material in the Primary Containment Vessel (PCV) under severe accident conditions. The post-doctoral fellow will investigate the characteristics of such radioactive material and aerosols (chemical form, size distribution, etc) by conducting simulation tests. These tests will simulate FP transport from core to PCV. The aerosols analyses on size distribution will be conducted in the different transport stages, and will be coupled with post characterizations of the deposits (microstructure and chemical state). The post-doctoral fellow will be also involved in the evaluation of the radioactive material behavior and aerosol formation mechanism, by performing analytical studies on the chemical reaction kinetics and by comparing the simulation tests with the analysis of environmental samples.
   F16	Clarification of Cs desorption mechanism on Cs free mineralization of clay minerals
   	Materials Sciences Research Center	Analytical Sciences Development Research Group	Tokai Research and Development Center (Nuclear Science Research Institute)	Iwao Shimoyama Tel:+81-29-284-3929 E-mail: shimoyama.iwao@jaea.go.jp	Radiation Worker	Chemistry Physics Geo and Environemtal Sciences Material
   	We study Cs desorption mechanism from clay minerals to develop Cs-free meneralization for volume reduction and reuse of radioactive contaminated soil in Fukushima. Weathered biotite (WB) in Fukushima is adopted as a model soil and sorbed with non-radioactive Cs. WB is heated with some alkaline salt reagents in ambient atomosphere condition or low-pressure conditions and products formed after the heating treatment are analyzed using X-ray diffraction and X-ray flulrescence analysis. Especially, we focus on the dependences of reagents and pressure on Cs desorption ratio and structural change of WB in this study.