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Fukushima Environmental Safety Center, Headquarters of Fukushima Partnership Operations; Ningyo-toge Environmental Engineering Center; Fuel Cycle Safety Research Unit, Nuclear Safety Research Center; Geological Isolation Research Unit, Geological Isolation Research and Development Directorate; Nuclear Cycle Backend Directorate
JAEA-Research 2012-019, 125 Pages, 2012/08
JAEA-Research-2012-019.pdf:12.81MB
Measures against environmental contamination by radioactive materials originated from the Fukushima nuclear accident (May, 2011), are being conducted in Fukushima and surrounding prefectures. Regarding to the measures, a phytoremediation experiment with several types of lawn grasses in a field scale have been carried out. Lawn grasses are generally characterized by shallow rizosphere, high density and root mat formation. Decontamination effectiveness of radioactive cesium by plant uptake and by sod removing was investigated. As a result, the range of decontamination factors by plant uptake was below than 1% because of low transfer rate form soil to plant. On the other hand, maximum decontamination factor by sod removing reached about 100%. Decontamination activities with various methods will be implemented according to the national decontamination policy and related plans in each municipality. The phytoremediation method with lawn grass would be applicable in limited circumstances.
Geological Isolation Research and Development Directorate
JAEA-Evaluation 2010-001, 29 Pages, 2010/08
JAEA-Evaluation-2010-001.pdf:47.54MB
JAEA-Evaluation-2010-001-appendix(CD-ROM).zip:87.6MB
Japan Atomic Energy Agency (JAEA) consulted an assessment committee, "Evaluation Committee of Research and Development (R&D) Activities for Geological Disposal of High-Level Radioactive Waste", for interim assessment of R&D on high-level radioactive waste disposal in accordance with "General Guideline for Evaluation of Government R&D Activities" by Cabinet Office, Government of Japan, "Guideline for Evaluation of R&D in Ministry of Education, Culture, Sports, Science and Technology" and "Regulation on Conduct for Evaluation of R&D Activities" by Japan. In response to JAEA's request, the Committee assessed mainly the progress of the R&D project according to guidelines, which addressed the rationale behind the R&D project, the relevance of the project outcome and the efficiency of the project implementation during the period of the first midterm plan. As a result, the Committee concluded that the progress of the R&D project is satisfactory. In addition, the Committee provided a couple of issues and suggestions to be addressed in the implementation of the project during the period of the second midterm.
Tono Geoscientific Research Unit, Geological Isolation Research and Development Directorate
JAEA-Review 2010-016, 37 Pages, 2010/06
JAEA-Review-2010-016.pdf:5.8MB
The Japan Atomic Energy Agency is implementing scientific studies of the deep geological environment and development of technologies to enhance the reliability of geological disposal technology ('geoscientific research') at Mizunami Underground Research Laboratory (MIU). The aims of the MIU Project are to establish techniques for investigation, analysis and assessment of the deep geological environment, and to develop a range of engineering techniques for deep underground application, with main focus on the crystalline rock with fresh ground-water condition. The master plan of the MIU project has been revised several times since 1996, reflecting the revision of "Long-term plan for Research, Development and Utilization of Nuclear Energy" and relocation of the research site. In 2009, revisions of the basic policy about fundamental strategy for geological disposal have resulted in the extension of the time range to reach the milestone on the establishment of methodologies for the detailed investigation. On the other hand, increasing role of the underground research facility as a platform for achieving the public acceptance of the geological disposal has been recognized. Thus JAEA has intended to construct an additional research gallery at a depth of 300m of the MIU and to revise the master plan therein. In this revision, major results of the Phase I(surface-based investigation) have highlighted and investigations for the Phase II (construction) and Phase III (operation) are restructured from the view point of their relative importance to the implementation of the geological disposal programme.
Geological Isolation Research and Development Directorate; Advanced Waste System Research Project, Radioactive Waste Management Funding and Research Center*
JAEA-Research 2008-060, 72 Pages, 2008/06
JAEA-Research-2008-060.pdf:20.38MB
JAEA and RWMC have carried out a joint research program on advanced technologies that could be used to support performance assessment and monitoring of geological disposal concepts for high-level radioactive waste. The 5 items regarding to performance assessment and 1 item for monitoring were considered in the program. The items were discussed in the context of technological experiences gained by JAEA and RWMC in previous repository-related studies. According to the results of these discussions, development strategies for each of the technology areas identified above were efficiently formulated by appropriate task allocations. Specific technical subjects requiring further investigation were identified using this approach, and a priority of subject was also discussed.
Geological Isolation Research and Development Directorate; Advanced Waste System Research Project, Radioactive Waste Management Funding and Research Center*
JAEA-Research 2006-091, 140 Pages, 2006/12
JAEA-Research-2006-091.pdf:9.66MB
Research on advanced technology of performance assessment for geological disposal of high-level redioactive waste has been performed by a joint research program between JAEA and RWMC using their own technology and know-how. The following 5 items have been considered in the program. (1)Planning of basic strategy for development of analysis technology on nuclides migration for various scales, (2)Development of analysis technology for a scale of vitrified waste, (3)Development of analysis technology for a scale of disposal facility, (4)Development of integration technology for geochemical information, (5)Development of understanding promotion technology for logic to explain safety Based on the overall plan defined in this year, it would be important to continue the concrete research and development to resolve the subjects in the future.