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ナトリウム冷却高速炉を対象とした森林火災に伴う影響要因の分析とフラジリティ簡易評価手法の開発

Study on forest fire related challenges and development of simplified fragility evaluation method for sodium-cooled fast reactor

岡野 靖; 山野 秀将

Okano, Yasushi; Yamano, Hidemasa

ナトリウム冷却高速炉(SFR)は事故時における崩壊熱の最終除熱源を大気としており、森林火災等の空気冷却系に影響を及ぼす外的要因によるリスク評価が重要となる。本報では、確率論的リスク評価における事象進展評価への適用を念頭に、森林火災に伴う諸現象とそれに伴うSFRに対する潜在的な影響要因について分析を行い、さらに崩壊熱除去機能の維持に関連する構造物等に対するフラジリティの簡易的評価手法の提案を行う。

A sodium-cooled fast reactor uses ambient air as an ultimate heat sink under accident conditions. Risk assessment of external hazards such as a forest fire that affect air cooling system is therefore important for safety. This paper describes analyses of forest fire related phenomena and influential factors, and associated potential risks on air cooling system in order to apply to a methodology development of an event progress as a part of a probabilistic risk assessment. A simplified assessment method for fragility of relevant structure and component to maintain decay heat removal function are proposed.

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