This paper describes a new safety concept for the Japanese geological disposal program, which is a development of the conventional multi-barrier system concept. The Japanese government established the ‘Nuclear Waste Management Organization of Japan’ (NUMO) as an implementation body in 2000 based on the “Final disposal act” following the publication of the “H-12 Report”, which confirmed the scientific and engineering feasibility of HLW geological disposal in Japan. Since then, NUMO has undertaken further technical developments aimed at achieving safe and efficient implementation of final disposal. The safety concept developed in the “H-12 Report” provides sufficient safety on the basis of site-generic considerations. However, it is considered to be over-conservative and therefore does not represent the most probable performance of the engineered or natural barriers. Recently, concrete measures have been proposed requiring the safety case to be presented in terms of a realistic assessment of the most probable performance. This approach takes into account the safety functions of both engineered and natural barriers as well as the long-term static geochemical equilibrium. In particular, the evolution of the safety performance of engineered and natural barriers can be efficiently augmented by the realistic long-term geochemical equilibrium.
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ASME 2009 12th International Conference on Environmental Remediation and Radioactive Waste Management
October 11–15, 2009
Liverpool, UK
Conference Sponsors:
- Nuclear Engineering Division and Environmental Engineering Division
ISBN:
978-0-7918-4407-6
PROCEEDINGS PAPER
New Safety Concept for Geological Disposal in Japan
Kazumi Kitayama
Kazumi Kitayama
Nuclear Waste Management Organization of Japan (NUMO), Tokyo, Japan
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Kazumi Kitayama
Nuclear Waste Management Organization of Japan (NUMO), Tokyo, Japan
Paper No:
ICEM2009-16339, pp. 677-679; 3 pages
Published Online:
December 12, 2010
Citation
Kitayama, K. "New Safety Concept for Geological Disposal in Japan." Proceedings of the ASME 2009 12th International Conference on Environmental Remediation and Radioactive Waste Management. ASME 2009 12th International Conference on Environmental Remediation and Radioactive Waste Management, Volume 1. Liverpool, UK. October 11–15, 2009. pp. 677-679. ASME. https://doi.org/10.1115/ICEM2009-16339
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