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Report No.

H12: Project to establish the scientific and technical basis for HLW disposal in Japan, Supporting report 3: Safety assessment of the geological disposal system

not registered; not registered; Shimizu, Kazuhiko; Miyahara, Kaname  ; not registered ; Hasegawa, Hiroshi; Makino, Hitoshi 

It was demonstrated in Supporting Report 1, based on extensive investigations and literature surveys, that stable geological environments exist in Japan that are suitable for geological disposal of HLW. The characteristics of these geological environments have been summarized to provide a basis for the H12 design study and safety assessment. Examples of repository designs have been developed and presented in Supporting Report 2. In this Supporting Report, a robust safety assessment methodology has been developed, focusing on the barrier functions of the engineered barrier system (EBS) and the near-field host rock within tens of meters of the repository. Moreover, this methodology has been applied to assess the safety of the geological disposal system defined in Supporting Reports 1 and 2. This Supporting Report consists of the following nine Chapters. Chapter I presents the objectives of H12 safety assessment, Chapter II summarized the AEC Guidelines and safety assessment procedures, I



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