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再処理施設の高レベル廃液蒸発乾固事故における気相へのRu移行速度の導出

Development of Ru transfer rate correlation to vapor phase in accident of evaporation to dryness by boiling of reprocessed high-level liquid waste

吉田 一雄 ; 田代 信介 ; 天野 祐希 ; 山根 祐一 ; 内山 軍蔵 ; 阿部 仁 

Yoshida, Kazuo; Tashiro, Shinsuke; Amano, Yuki; Yamane, Yuichi; Uchiyama, Gunzo; Abe, Hitoshi

再処理施設でのシビアアクシデントの一つとして、冷却機能喪失により高レベル廃液の沸騰し、蒸発乾固する事故が想定される。この事故では、大量のRuが気化し、貯槽内気相部に移行し環境中に放出される可能性がある。そのため、Ruの放出量評価が事故影響評価の重要な課題の一つである。これを解決するために、模擬廃液を用いた加速試験で得られたデータを基に廃液温度,廃液硝酸モル分率および硝酸活量をパラメータとするRuの移行速度実験式を導出した。実廃液を用いた長時間実験でのRu放出量を実験式を基に計算し、実測値との良好な一致を示すことができた。

An accident of evaporation to dryness by boiling of high level liquid waste (HLLW) is postulated as one of the severe accidents to occur caused by the loss of cooling function at a fuel reprocessing plant. In this case, a large amount of ruthenium (Ru) will be volatilized and transfer to the vapor phase in the tank, and could be released to the environment. Therefore, the quantitative estimation of released Ru is one of the key issues in the assessment of the accident consequence. To resolve this issue, an empirical correlation for Ru transfer rate to vapor phase with the temperature, nitric acid mol fraction and activity of HLLW has been developed based on the data obtained from the accelerated experiments using simulated HLLW. A simulation study with the developed correlation demonstrated that amount of Ru transfer to vapor phase was in a good agreement with the long term experiment using actual HLLW.

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