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Outline of research and development of spent fuel direct disposal in Japan

日本における使用済燃料直接処分の研究開発の概要

畑中 耕一郎

Hatanaka, Koichiro

原子力機構は、平成25年度から使用済燃料の直接処分に関する研究開発に着手した。これまでの研究開発においては、わが国の地質環境特性と使用済燃料特性を考慮し、使用済燃料の地層処分システムについての予備的な設計と安全評価を実施することを通して、設計と安全評価のアプローチを構築するとともに、多重バリアシステムを基本とした処分概念と安全確保の考え方や現状の技術レベルを示すことができた。また、次段階の研究開発に向けて取り組むべき設計と安全評価に関する課題を抽出し、分類・整理した。今後は、分類・整理した課題への対応を行うことにより直接処分の技術的信頼性を例示していく。

JAEA has initiated research and development of spent fuel direct disposal in FY 2013. In the research and development so far, we were able to construct approaches for design and safety assessment and to present the disposal concept based on multi barrier system as well as the technical level of the direct disposal, through carrying out the preliminary design and safety assessment, by taking characteristics of geological environment in Japan and the spent fuels into consideration. In addition, challenges/issues related to the design and safety assessment to be addressed towards the research and development in the next stage, were identified, classified and organized. In the future, we are going to present the technical reliability of the direct disposal by resolving the challenges/issues.

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