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受動的安全特性によるFBRの安全性の強化(I) 受動的安全方策の評価・研究開発計画の提案-

Improvement of the level of safety for future FBR by means of passive safety features; 1:Assessment of passive safety measures and proposal of their R&D programs

家田 芳明 ; 丹羽 元; 宇都 成昭  ; 山口 彰; 上出 英樹 ; 大島 宏之; 林 謙二

not registered; not registered; Uto, Nariaki; Yamaguchi, Akira; Kamide, Hideki; Ohshima, Hiroyuki; Hayashi, Kenji

この報告書では、将来の大型高速増殖炉を対象として、炉心崩壊事故(CDA)の発生防止あるいは影響緩和の目的で導入される可能性のある受動的な安全方策について議論する。 まず、受動的な安全方策を評価するための方法論を提案する。また、将来から提案されている受動的な安全方策をレビューするとともに、CDAの発生防止及び(または)影響緩和に有効な革新的な受動的安全方策を提案する。これらの受動的安全方策を、提案した方法論で評価した後、推奨される受動的な安全方策の組み合わせ例を提示する。さらに、受動的な安全方策の有効性を実証するために必要な研究開発計画を、新たな炉内試験計画を含めて提示する。

In this report passive prevention and mitigation measures with regard to core disruptive accident in future large scale liquid metal cooled fast breeder reactors are discussed and assessed. First the criteria for the assessment of passive safety measures are proposed, and the commonly proposed passive prevention and mitigation measures are briefly reviewed. Then innovative prevention and mitigation measures are newly proposed to provide additional mechanisms to limit the core damage or to prevent a recriticality event during the core disruption process. After assessing these passive measures based on the proposed criteria, appropriate combinations of the measures are recommended. Further, required R&D programs to confirm their effectiveness are described including necessity of a new in-pile experimental program.

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