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外部ハザードに対する崩壊熱除去機能のマージン評価手法の研究開発,9; 森林火災ハザード評価手法

Research and development of margin assessment methodology of decay heat removal function against external hazards, 9; Forest fire hazard assessment methodology

岡野 靖; 山野 秀将   

Okano, Yasushi; Yamano, Hidemasa

事故時の最終除熱源を大気とするナトリウム冷却高速炉を対象に森林火災ハザードに対するレベル1PRA手法開発を行っている。本報では、ロジックツリーに基づく森林火災ハザード曲線の評価手法の概念を構築するとともに、森林火災シミュレーションによりハザード評価で重要な気象条件の感度を評価した。

There has been an increased concern in the safety of NPP for external hazards, one of which is a forest fire. Conventional forest fire assessments have been performed with deterministic and conservative manner, using so-called envelope initial and boundary conditions on forest fire analyses. In this study, the forest fire hazard assessment methodology, which is subject to an external-hazard probabilistic risk assessment (PRA), is being developed in order to quantitatively evaluate frequency and consequence of the forest fire that has a potential impact on a NPP and then to obtain the Core Damage Frequency. The new methodology based on a logic tree is developed in this study, as well as the sensibility analyses on weather conditions.

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