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Development of failure probability evaluation methodology of natural circulation heat removal function in level-1 PSA for sodium-cooled fast reactors

ナトリウム冷却高速炉のレベル1PSAにおける自然循環冷却失敗確率評価手法の開発

山野 秀将  ; 堺 公明; 栗坂 健一 

Yamano, Hidemasa; Sakai, Takaaki; Kurisaka, Kenichi

本研究は、自然循環除熱の受動安全機能の破損確率評価手法開発を目的として行われた。現象同定ランキングテーブルを用いた失敗要因同定に続き、本論文は1次系原子炉補助冷却系喪失を想定し1冷却の直接炉心補助冷却系のみが作動した場合の自然循環冷却機能の失敗確率を算定する。失敗確率は冷却材バウンダリ温度の安全性の判断基準を上回るものとして求めた。代表ケースの失敗確率は非常に低く自然循環による崩壊熱除去機能が非常に信頼性の高いことを示した。

This study is aimed to develop a methodology of failure probability evaluation for the passive safety features on natural circulation heat removal. Following the identification process on failure causes using the phenomena identification and ranking table, this paper provides a failure probability of the natural circulation heat removal function that is expected to actuate only one direct reactor auxiliary cooling system assuming the loss of two primary reactor auxiliary cooling systems. The failure probability was determined above a safety criterion of the coolant boundary temperature. The failure probability of the reference case was very low, indicating a high reliability of the natural circulation decay heat removal function.

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