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※ 半角英数字
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Development of risk assessment methodology of decay heat removal function against external hazards for sodium-cooled fast reactors, 3; Numerical simulations of forest fire spread and smoke transport as an external hazard assessment methodology development

ナトリウム冷却高速炉を対象とした外部ハザードに対する崩壊熱除去機能に関するリスク評価手法の開発,3; 外部ハザード評価手法開発のための森林火災延焼及び煤煙移行挙動の数値シミュレーション

岡野 靖; 山野 秀将

Okano, Yasushi; Yamano, Hidemasa

森林火災の延焼及び煤煙移行の数値シミュレーションを行い、天候条件に対する感度、及び、ナトリウム冷却高速炉の空気冷却器エアフィルターにおける煤煙積算量を評価した。森林火災延焼シミュレーションはFAR SITEを用い、時間進展に伴う火災エリアの拡大と反応強度、火線強度を導出した。煤煙移行挙動はALOFT-FTを用い、PM2.5/10粒子の空間濃度分布を導出した。エアフィルターにおける煤煙積算量は単位面積あたり数百グラム程度と見積もられ、これは運転上の制限である15kgを大きく下回ることが分かった。

Numerical simulations of forest fire propagation and smoke transport were performed with sensibility studies to weather conditions, and the effect by the smoke on the air filter was quantitatively evaluated. Forest fire propagation simulations were performed using FARSITE code. A temporal increase of a forest fire spread area, a position of the frontal fireline, "reaction intensity" and "frontal fireline intensity" are obtained and used for the smoke transport simulations by ALOFT-FT where spatial distribution of PM2.5 and PM10 are evaluated. The total amount of particle matter at the air filter at the nuclear power plant is around several hundred grams per m$$^{2}$$ which is well below the operational limit of the air filter of 15 kg/m$$^{2}$$.

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