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ACE-3D code analyses of multi-dimensional boiling flow in horizontal PCCS water pool

横型PCCS水プール内多次元沸騰流のACE-3Dコードによる解析

大貫 晃; 中村 秀夫 ; 安濃田 良成; 小幡 宏幸*; 最首 貞典*

Onuki, Akira; Nakamura, Hideo; Anoda, Yoshinari; Obata, Hiroyuki*; Saishu, Sadanori*

BWRの静的格納容器冷却系(PCCS)として横型熱交換器を用いることが検討されている。横型PCCSの除熱性能を規定するものの一つに2次側水プール内での熱伝達特性がある。熱流束の高い領域では沸騰と凝縮が混在し、二相自然循環による流量の増加や流れの変動による熱伝達の増大が想定できる反面、伝熱管のある領域が蒸気のみで覆われ、熱流束が低下する蒸気ブランケット効果の懸念もある。本報では、多次元二流体モデルコードACE-3Dにより2次側水プール内の熱流動特性を評価した。解析の結果、定常的に蒸気で覆われる領域はなく、核沸騰の効果や局所流量の増加により熱伝達は増大することがわかった。

A passive containment cooling system (PCCS) is under planning to use in a next-generation-type BWR for long-term cooling by condensing steam using horizontal heat exchangers. Heat transfer behavior in a secondary water pool is one of important phenomena governing heat removal performance of the PCCS. Boiling and condensation can be supposed under high heat flux regions and the two-phase natural circulation might enhance the heat transfer due to an increase of flow rate and a flow agitation. However, some heat transfer tubes might be covered only by steam and the heat transfer is degraded in such region (Steam-blanket effect). This study evaluated the characteristics of the heat transfer behavior in the secondary water pool by multi-dimensional two-fluid model code ACE-3D. It was found from the analyses that no any heat transfer tubes are covered only by steam and the heat transfer is enhanced due to the nucleate boiling and the increase of local liquid flow rate.

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