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簡素化溶媒抽出法によるU, Pu及びNp共回収(高酸濃度スクラブ条件化におけるNpの抽出挙動)

Uranium, plutonium and neptunium co-recovery by single cycle extraction process (Neptunium extraction behaviour on high concentration acid condition)

宮地 茂彦; 中原 将海; 佐野 雄一; 野村 和則; 北嶋 卓史; 小泉 務

Miyachi, Shigehiko; Nakahara, Masaumi; Sano, Yuichi; Nomura, Kazunori; Kitajima, Takafumi; Koizumi, Tsutomu

U,Pu及びNpの共回収については、これまでの高レベル放射性物質研究施設(CPF)でのホット試験において、フィード溶液の高酸濃度化によるNp(V)からNp(VI)への酸化の促進が有効であることを確認している。本報告ではフィード溶液の酸濃度を変更せずにスクラブ液を高酸濃度化することによっても、安定した運転が行えることを確認した。

The hot experiments on solvent extraction conducted in the Chemical Processing Facility (CPF) has demonstrated that the oxidation of Np in the feed solution from Np(V) to Np(VI) by making the acidity higher than conventional condition is effective in the co-recovery of U, Pu and Np so far. Furthermore, it was confirmed that Np was quantitatively recovered with U and Pu by applying of highly acidic scrubbing solution under the conventional condition of the acidity of the feed solution. The main results obtained are presented in this report.

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