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Determination of ISI requirements on the basis of system based code concept

システム化規格概念に基づくISI要求の決定

高屋 茂; 神島 吉郎*; 町田 秀夫*; 渡辺 大剛*; 浅山 泰

Takaya, Shigeru; Kamishima, Yoshio*; Machida, Hideo*; Watanabe, Daigo*; Asayama, Tai

システム化規格概念に基づく新しい供用期間中検査要求の決定手順を提案した。提案手順では、構造健全性に着目した評価とプラントの安全性に着目した評価の二つを行うことを要求している。本研究では、高速増殖原型炉「もんじゅ」の原子炉容器ガードベッセルおよび炉心支持構造に同手順を適用した。提案手順により、プラントの特徴を考慮した合理的な供用期間中検査が実現できると期待される。

In our previous study, a new process for determination of in-service inspection (ISI) requirements was proposed on the basis of the System Based Code concept. The proposed process consists of two complementary evaluations, one focusing on structural integrity and the other on plant safety. In this study, ISI requirements for a reactor guard vessel and a core support structure of the prototype sodium-cooled fast breeder reactor in Japan, Monju, were investigated according to the proposed process. The proposed process is expected to contribute to realize effective and rational ISI by properly taking into account plant-specific features.

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