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核分裂生成物化学挙動の解明に向けた基礎研究,5; 軽水炉シビアアクシデント時のストロンチウム放出移行挙動の検討

Fundamental research on fission product chemistry, 5; On the release and transportation behavior of strontium under an LWR severe accident

三輪 周平  ; 宮原 直哉; 鈴木 恵理子   ; 中島 邦久  ; 逢坂 正彦  

Miwa, Shuhei; Miyahara, Naoya; Suzuki, Eriko; Nakajima, Kunihisa; Osaka, Masahiko

雰囲気の影響を考慮可能な放出モデルと化学平衡計算により軽水炉シビアアクシデント(SA)時のストロンチウム(Sr)の放出移行挙動に与える雰囲気の影響を検討した。水蒸気欠乏雰囲気では、水蒸気雰囲気で放出移行量の小さいSrが有意量燃料から放出される一方で、格納容器等への移行量は低くなる可能性があることが分かった。

The effects of atmosphere on the release and transport behavior of strontium (Sr) in the light water reactor severe accident (SA) was discussed based on the results calculated by release model which can evaluate the influence of atmosphere and the chemical equilibrium calculation. Under the steam starvation atmosphere condition, there is possibility that non-volatile Sr in the steam atmosphere is significantly released from fuel, while the amount of transport into the primary containment vessel is suppressed.

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