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GIF risk and safety working group; Application of the ISAM methodology to Gen-IV nuclear systems

第4世代原子炉に関わる国際協力リスク安全ワーキンググループ; ISAM手法の第4世代原子炉システムへの適用

岡野 靖; Ammirabile, L.*; Sofu, T.*

Okano, Yasushi; Ammirabile, L.*; Sofu, T.*

第4世代原子炉システムに関する国際フォーラムのISAM(Integrated Safety Assessment Methodology)手法は5つの評価ツール(QSR, PIRT, OPT, DPA, PSA)を総合的に用いるもので、各ツールにより安全に関する様々なレベルの問題に対応すると同時に、全体としては、評価対象や設計進展度合いに応じた柔軟な評価を原子炉システムに対し行えるものである。5つのツールは各出力が別の入力に用いられるなど、設計プロセス全体にわたり総合的に活用される。論文では、これらISAM各ツールの内容と評価の進め方、活用事例について報告を行う。

GIF ISAM (Integrated Safety Assessment Methodology) includes five analytical tools (i.e. QSR, PIRT, OPT, DPA, PSA) and it is intended that each tool be used to answer specific safety-related questions with different levels of detail during various design stages and the ISAM as a whole offers flexibility and a graded approach to analyse technical issues of complex system architectures. Although each tool can be selected for individual and exclusive use, the full value of the integrated methodology is derived from using all tools, in an iterative fashion and in combination with the others, throughout the design process. The paper describes what is ISAM and pilot examples of individual use of QSR, PIRT and OPT and also combination application of DPA-PSA.

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