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Development of failure probability evaluation methodology of passive safety function in level-1 PSA for sodium-cooled fast reactors; Identification of important uncertainty parameters

ナトリウム冷却高速炉のレベル1PSAにおける受動安全機能喪失確率評価手法の開発; 重要な不確実さパラメータの同定

山野 秀将   ; 堺 公明; 栗坂 健一 

Yamano, Hidemasa; Sakai, Takaaki; Kurisaka, Kenichi

本研究は、受動安全機能の喪失確率評価手法の開発を目的とする。本研究に続いて行われる重要な不確実さパラメータの感度解析に向けて、本開発の第一歩として、受動炉停止及び崩壊熱除去システムすなわち受動安全機能の喪失原因の同定が行われる。本研究は故障原因,ランク表,重要な不確定パラメータの同定を説明する。

This study is aimed to develop a methodology of failure probability evaluation for the passive safety features. In this paper, the first step of this development is reported for both the passive shutdown and the decay heat removal systems, namely identification of failure causes on the passive safety features as well as identification of important uncertainty parameters for sensitivity analyses that will be performed in the subsequent step of this study. This paper describes the failure causes, ranking table, and identified important uncertain parameters.

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