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先進湿式法再処理の晶析工程におけるCs挙動把握のための模擬溶解液を用いた基礎試験

Experimental study on behavior of Cs in uranium crystallization of advanced aqueous reprocessing system with simulated dissolver solution

柴田 淳広; 矢野 公彦; 紙谷 正仁; 中村 和仁; 鷲谷 忠博; 近沢 孝弘*; 菊池 俊明*

Shibata, Atsuhiro; Yano, Kimihiko; Kamiya, Masayoshi; Nakamura, Kazuhito; Washiya, Tadahiro; Chikazawa, Takahiro*; Kikuchi, Toshiaki*

U晶析工程におけるCsの挙動を調べるため、模擬溶解液を用いたU晶析バッチ試験及びU(IV)溶液を用いたCs複塩生成基礎試験を実施した。使用済燃料の溶解液中のCs濃度では、先進湿式法再処理のU晶析工程の条件においてCsNO$$_{3}$$やCs$$_{2}$$UO$$_{2}$$(NO$$_{3}$$)$$_{4}$$は生成せず、他のFP元素との相互作用によるCs塩も生成する可能性は小さいことを確認した。また、U(IV)溶液を用いたCs複塩生成基礎試験の結果から、酸濃度が5mol/dm$$^{3}$$以上の場合にはCsとPu(IV)の複塩が生成する可能性が示唆された。

Behavior of Cs in U crystallization process of advanced aqueous reprocessing system was investigated with simulated dissolver solution. Beaker-scale U crystallization experiments were carried out with some simulated dissolver solutions. The results show that possibility of generation of CsNO$$_{3}$$,Cs$$_{2}$$UO$$_{2}$$ (NO$$_{3}$$)$$_{4}$$ or Cs-FP complex salt is small. Precipitation experiments of Cs-U(IV) complex salts were also carried out with nitrate solution of U(IV) and Cs. It was found that Cs-U(IV) complex salt was precipitated in higher acidity than 5 mol/dm$$^{-3}$$. It is suggested that Cs-Pu(IV) precipitates can be generated in the U crystallization process, under specific solution condition.

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