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Second progress report on research and development for TRU waste disposal in Japan; Repository design, safety assessment and means of implementation in the generic phase

TRU廃棄物処分技術検討書; 第2次TRU廃棄物処分研究開発取りまとめ(英語版)

日本原子力研究開発機構; 電気事業連合会*

Japan Atomic Energy Agency; Federation of Electric Power Companies of Japan*

TRU廃棄物処分の事業並びに制度化に資するため、電気事業者等と核燃料サイクル開発機構(現日本原子力研究開発機構)が協力し、2005年9月に「TRU廃棄物処分技術検討書(第2次TRUレポート)」を公表した。本報告書は、第2次TRUレポートの内容を広く海外の研究者や技術者に普及するために、英語版として取りまとめたものである。我が国における核燃料サイクルから発生するTRU廃棄物の特性及び廃棄物の処分概念について示すとともに、地層処分概念について具体的な処分施設の設計及び安全評価を行い、諸外国の安全基準と比較することにより、その安全性を示した。また、幅広い地質環境や安全裕度を高めるための代替技術や地層処分以外の処分概念の安全評価も実施した。さらに、高レベル放射性廃棄物との併置処分等による処分の合理化について検討を行い、併置処分の具体的なレイアウト評価を行った。これらの評価結果をもとにTRU廃棄物処分の実施に向けた展望及び今後の研究開発課題について示した。

In order to promote the establishment of a regulatory framework and the implementation of TRU waste disposal, the Federation of Electric Power Companies of Japan (FEPC) and the Japan Nuclear Cycle Development Institute (now JAEA) collaborated and published a progress report in Japanese (hereafter TRU-2) in September 2005. The report here is an English version of TRU-2 and has been published to widely inform overseas researchers and engineers of the contents of TRU-2. In this report, the characteristics of TRU waste generated from the nuclear fuel cycle in Japan and its disposal concept are shown. The design of the TRU waste disposal facility was evaluated and safety assessments were carried out to show that safety could be validated by comparing with regulatory guidelines in overseas performance assessment reports. Alternative technologies were developed to deal with various geological environments and to improve safety margins in addition to evaluating other disposal concepts. Furthermore, optimisation through co-location disposal of TRU waste and high level radioactive waste was investigated, and an example layout of a co-location disposal concept was evaluated. Based on these evaluation results, future issues and outstanding items on research and development for TRU waste disposal are summarised.

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