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Characteristics of dicesium plutonium(IV) nitrate formation in separation system of uranyl nitrate hexahydrate crystal

Nakahara, Masaumi; Yano, Kimihiko ; Shibata, Atsuhiro ; Takeuchi, Masayuki ; Okano, Masanori ; Kuno, Takehiko 

For decontamination of Cs and Pu compound, Cs$$_{2}$$Pu(NO$$_{3}$$)$$_{6}$$, precipitated in the U cooling crystallization method, solubility measurement of Cs$$_{2}$$Pu(NO$$_{3}$$)$$_{6}$$ in a uranyl nitrate solution and a U crystallization experiments were carried out with the dissolver solution derived from irradiated fast neutron reactor core fuel. The solubility of Cs$$_{2}$$Pu(NO$$_{3}$$)$$_{6}$$ in the uranyl nitrate solution decreased with decreasing temperature. In the crystallization experiments, the decontamination factors of Cs and Pu for uranyl nitrate hexahydrate crystal decrease with increasing the Cs concentration in the feed solution because Cs$$_{2}$$Pu(NO$$_{3}$$)$$_{6}$$ formed in the course of U crystallization. Basic data were obtained for the formation behavior of Cs$$_{2}$$Pu(NO$$_{3}$$)$$_{6}$$ in the U crystallization process.

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