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
   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.
   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.
   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.
   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.
   J32	Development of Neutron Detectors at Materials and Life Science Facility of J-PARC
   	Sector of Nuclear Science Research, J-PARC Center	Materials and Life Science Division Neutron Instrumentation Section	J-PARC	Kaoru Sakasai Tel:+81-29-284-3519 E-mail: sakasai.kaoru@jaea.go.jp	Radiation Worker	Radiation Measurements and Instruments Electricity and Electronics
   	The work of neutron instrumentation section focuses on development of various neutron detectors and neutron optical devices for Materials and Life Science Facility (MLF) of J-PARC. Construction of a new neutron diffractometer for analysis of large protein-crystals is now under planning at the MLF. The neutron detectors for the diffractometer are required to have high performances such as large sensitive area and high spatial resolution. The successful applicant will participate in the development of such detectors using scintillators.
   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.
   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.
   F11	Development of analytical method for small amount radionuclides in environment
   	Sector of Fukushima Research and Development Fukushima Environmental Safety Center	Fukushima Safety Administration and Radiation Measurement Group	Fukushima(Miharu)	Yasuhiro UEZU Tel:+81-247-61-2911 E-mail: uezu.yasuhiro@jaea.go.jp	Non-Radiation Worker	Chemistry Geo and Environemtal Sciences Radiation
   	The transfer factor of Sr-90 and H-3(OBT) are not same of Cs-137 in environment . Therefore, our group would like to develop simple and rapid analytical methods for Sr-90 and OBT in environmental samples. The study points of Sr-90 analytical method by using Q-ICP-MS are reduction of isobar interference and increasing of sensitivity. The study points of OBT are aqueous yield from samples. http://fukushima.jaea.go.jp/initiatives/cat01/pdf1511/2-2_takeishi.pdf
   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.