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炉心膨張過程における非凝縮性ガスの影響

Effect of non-condensable gas in the post-disassembly expansion phase

山野 秀将  ; 飛田 吉春; 佐藤 一憲 ; 守田 幸路*; 松元 達也*; 福田 研二*

Yamano, Hidemasa; Tobita, Yoshiharu; Sato, Ikken; Morita, Koji*; Matsumoto, Tatsuya*; Fukuda, Kenji*

拡散律速による蒸発/凝縮挙動及び大気泡界面を扱うモデルを導入したSIMMER-IIIコードを既存の炉心安全性試験及び実機解析に適用し、安全評価上のモデルの特性を把握した。また、実機条件のように急速に蒸気泡が成長する状況では、非凝縮性ガスによる凝縮抑制効果は著しい影響を与えないことが示された。

The SIMMER-III code which introduced the models treating a diffusion-limited vaporization/condensation behavior and a large-bubble interface has been applied to the analyses of existing reactor safety test and reactor case, so that the characteristics of their models in evaluating reactor safety analysis were grasped. This study also revealed that the effect of non-condensable gas is not so significant in the situation of bubble expansion as rapid as reactor condition.

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