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
   J8	Experimental Research on Safety Assessment of Storage and Disposal of Radioactive Waste
   	Nuclear Safety Research Center	Waste Safety Research Group	Tokai Research and Development Center Nuclear Science Research Institute	Tetsuji Yamaguchi Tel:+81-29-282-6001 E-mail: yamaguchi.tetsuji@jaea.go.jp	Radiation Worker	Chemistry Geo and Environemtal Sciences Material Chemical Engineering
   	Safety assessments of storage and disposal of radioactive wastes require quantitative analysis of long-term alteration of barrier materials used in storage and disposal systems. This study investigates long-term alteration behavior such as corrosion, dissolution and alteration of glass, metals, clays, concretes and polyethlene focusing on primary factors such as adjacent barrier materials, groundwater composition, geology, colloids, microbes and radiolysis. The goal is to obtain scientific basis for models evaluating changes in the barrier functions and for systematical establishment of datasets.
   J17	Development of metal recognition reagents and high efficient chemical separation systems
   	Sector of Nuclear Science Research Advanced Science Research Center	Research Group for Interfacial Reaction-Field Chemistry	Tokai Research and Development Center Nuclear Science Research Institute	Hirochika Naganawa Tel:+81-29-282-6615 E-mail: naganawa.hirochika@jaea.go.jp	Radiation Worker	Chemistry Applied Chemistry Chemical Engineering
   	The purpose of this research is to develop new chemical separation and sensing technologies having high efficiency and sensitivity for radioactive materials in environmental samples and valuable metals in industrial wastes. Specifically, separation systems for actinides, rare(minor) metals, precious metals, and heavy metals will be developed by using new extractants, adsorbents, and biomaterials that have high selectivity and binding ability for the metal ions. In this theme, fundamental and practical studies go together by applying "emulsion flow extractor" of a new-type extracting device.
   J22	Research and development of minor actinide separation process from high level liquid waste
   	Nuclear Science and Engineering Center	Research Croup for Partitioning, Partitioning and Transmutation Technology Division	Tokai Research and Development Center Nuclear Science Research Institute	Tatsuro Matsumura Tel:+81-29-282-6673 E-mail: matsumura.tatsuro@jaea.go.jp	Radiation Worker	Chemistry Applied Chemistry Chemical Engineering
   	In order to reduce the burden of the geological disposal of high level waste (HLW), partitioning and transmutation technology has been investigated. Since minor actinides have high radiotoxity and long half lives, the separation from HLW is very important. The subject of this theme is development of recovery and separation process of minor actinides with novel extractant from HLW for partitioning and transmutation technology. In this study, the novel extractants which has high selectivity of americium and curium from high level liquid waste will be studied and evaluated applicability for practical separation process. The experiments using minor actinides and high level liquid waste in glove boxes and hot cells will be carried out.
   J24	Research on high-performance oxygen sensor for liquid lead-bismuth eutectic
   	Nuclear Science and Engineering Center	Research Group for Corrosion Resistant Materials, Fuels and Materials Engineering Division	Tokai Research and Development Center Nuclear Science Research Institute	Fumiyoshi Ueno Tel:+81-29-284-3581 E-mail: ueno.fumiyoshi@jaea.go.jp	Non-Radiation Worker	Material Chemical Engineering
   	In JAEA, for the purpose of reducing the radioactive waste, Accelerator Driven System (ADS) for transmuting radioactive materials is developing. ADS is used lead-bismuth eutectic (LBE) liquid metal in the coolant and spallation target. Corrosion behavior of metallic material such as stainless steel changes by the oxygen concentration in the high temperature LBE, it is necessary to develop a high-performance sensor for measuring the oxygen concentration in the LBE. Therefore, in this theme, as fundamental research for measuring the oxygen concentration in the LBE with high accuracy, we will assemble a prototype oxygen sensor to perform measurement test. The effect of the impurities in LBE on measurement accuracy of the sensor will be investigated by analysis of surface deposits, thermodynamic analysis and electrochemical analysis.
   J36	Study of geological environment during construction, operation and closure of underground facility.
   	Tono Geoscience Center	Crystalline environment research group	Tono Geoscience Center	Teruki Iwatsuki E-mail: iwatsuki.teruki@jaea.go.jp	Non-Radiation Worker	Geo and Environemtal Sciences Chemistry Biology Chemical Engineering Measurements and Instruments Material
   	The construction, operation and closure of large underground facility changes hydraulic and hydrochemical condition around the facility. Such disturbance process and the recovery mechanism are still unclear. It is required to develop the observation and simulation methods for understanding of the phenomenon. Postdoctoral fellow studies the hydraulic and hydrogeochemical evolution (artificial disturbance and the recovery) process, impact of burial materials such as cement, clay in deep underground around Mizunami Underground Research Laboratory (MIU) during facility construction and after the closure by analyzing the rock, groundwater and burial materials, and previous data.
   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.