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軽水炉シビアアクシデント時の炉内高温領域におけるFP化学挙動評価,2; 高温におけるホウ素蒸気種とステンレス鋼の反応生成物の分析

FP chemistry in a high temperature region of LWR under a severe accident, 2; Analysis of reaction product between Boron vapor species and stainless steel at high temperature

高瀬 学; 鈴木 恵理子   ; 井元 純平 ; 中島 邦久  ; 三輪 周平  ; 小河 浩晃  ; 逢坂 正彦  

Takase, Gaku; Suzuki, Eriko; Imoto, Jumpei; Nakajima, Kunihisa; Miwa, Shuhei; Ogawa, Hiroaki; Osaka, Masahiko

軽水炉シビアアクシデント時の原子炉冷却系におけるBWR制御材ホウ素の蒸気種とステンレス鋼の高温化学反応実験を実施し、反応生成物を分析した。940Kよりも高温においてホウ素はステンレス鋼の表面で鉄と化学反応を生じ、Fe-B-O化合物を生成することで、固着する可能性があることが分かった。

A chemical reaction experiment between boron vapor, which is from BWR control material, and stainless steel at high temperature was conducted under the condition in nuclear reactor cooling system during LWR severe accident. It was found from the analysis of reaction products that boron may chemically react with iron at the surface of stainless steel and adhere as Fe-B-O compounds over 940 K.

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