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遠心抽出器を用いた酸分配法によるプルトニウムの分配挙動

Partitioning behavior of plutonium by acid split method using centrifugal contactors

中原 将海; 駒 義和  ; 中島 靖雄  

Nakahara, Masaumi; Koma, Yoshikazu; Nakajima, Yasuo

U及びPu共回収を目的としたPu還元剤を用いない酸分配法のフローシートを検討し、遠心抽出器を用いて向流多段抽出試験を実施した。低温、低HNO$$_{3}$$濃度においてPu分配が有利であることを利用し、抽出計算コードを用いてフローシートを構築した。U再抽出部を削除し、0.15mol/dm$$^{3}$$ HNO$$_{3}$$によりPuの逆抽出を行い、U/Pu製品中のPu富化度をフィード溶液に対して約2.3倍に高めた。

Acid split flow sheet without a Pu reductant for U and Pu co-recovery was investigated, and a countercurrent experiment using centrifugal contactors was carried out with a dissolver solution of irradiated fast reactor fuel. Partitioning of Pu has advantage under the conditions of low temperature and low HNO$$_{3}$$ concentration solution, and acid split flow sheet was evaluated by extraction calculation code. In the flow sheet, U scrubbing section was deleted, and Pu was stripped with 0.15 mol/dm$$^{3}$$ HNO$$_{3}$$. Then, the Pu content of the U/Pu product increased to approximately 2.3 times that of the feed solution.

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