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Transient extraction behavior analysis of plutonium in reprocessing

再処理施設におけるプルトニウムの過渡抽出挙動解析

内山 軍蔵; 阿部 仁

Uchiyama, Gunzo; Abe, Hitoshi

再処理分離工程の抽出廃液貯槽における臨界事故の発生シナリオkの検討に資するため解析研究及び実験研究を行った。解析研究では、抽出解析コードESSCARを用いてPuの過渡抽出挙動と還元液の流量などのプロセスパラメーターとの関係を調べた。Pu洗浄工程の有機相及び水相中のPu濃度は還元液の流量の異常減少とともに上昇することがわかった。実験研究では、Pu抽出挙動に影響を及ぼす亜硝酸及びDBPの抽出挙動を$$gamma$$線照射条件下のミキサセトラ型抽出器を用いて測定した。実験の結果、亜硝酸の有機相及び水相の各濃度は それぞれ1$$times$$10$$^{-4}$$M, 2$$times$$10$$^{-5}$$Mであった。また、DBPの有機相及び水相の各濃度は それぞれ5$$times$$10$$^{-4}$$M, 8$$times$$10$$^{-5}$$Mであった。

A simulation study and an experimental study were conducted for the consideration of a scenario of criticality accident at raffinate solution tanks in separation cycle in reprocessing plants. In a simulation study, transient extraction behavior of Pu has been studied with the solvent extraction simulation code, ESSCAR to understand the effect of process parameters in separation cycle. In the experimental study, extraction behaviors of nitrous acid and dibutyl phosphate (DBP) which influence the extraction behavior of Pu in separation cycles were investigated by using a mixer-settler under a $$gamma$$-ray irradiation condition. It was found that the concentrations of nitrous acid in both organic and aqueous phases were 1 $$times$$ 10$$^{-4}$$ M and 2 $$times$$ 10$$^{-5}$$ M, respectively. The concentrations of DBP in both organic and aqueous phases were 5 $$times$$ 10$$^{-4}$$ M and 8 $$times$$ 10$$^{-5}$$ M, respectively.

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