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Report No.

Influence of nitric acid and plutonium concentrations in dissolver solution of mixed oxide fuel on decontamination factors for uranyl nitrate hexahydrate crystal

Nakahara, Masaumi; Nomura, Kazunori  ; Washiya, Tadahiro ; Chikazawa, Takahiro*; Hirasawa, Izumi*

In order to examine the decontamination behavior of the Pu and fission products in the U crystallization process, experiments were carried out using mixed oxide fuel dissolver solution. It is confirmed that Eu was decontaminated by washing the uranyl nitrate hexahydrate crystals. However, the decontamination factors of Ba and Cs were low because they precipitated as Ba(NO$$_{3}$$)$$_{2}$$ and Cs$$_{2}$$Pu(NO$$_{3}$$)$$_{6}$$ after the U crystallization, respectively. The decontamination factor of Cs tends to decrease with increasing HNO$$_{3}$$ and Pu concentrations in the mother liquor because of the generation of Cs$$_{2}$$Pu(NO$$_{3}$$)$$_{6}$$.



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Category:Chemistry, Inorganic & Nuclear



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