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

硝酸ウラニル六水和物結晶の分離システムにおける硝酸セシウムプルトニウム(IV)の生成特性

中原 将海; 矢野 公彦 ; 柴田 淳広  ; 竹内 正行 ; 岡野 正紀 ; 久野 剛彦 

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

Uの冷却晶析法において生成するCs$$_{2}$$Pu(NO$$_{3}$$)$$_{6}$$を除去するため、Cs$$_{2}$$Pu(NO$$_{3}$$)$$_{6}$$の硝酸ウラニル溶液に対する溶解度測定試験と照射済高速中性子炉燃料溶解液を用いた晶析試験を実施した。温度が低下するに従い、Cs$$_{2}$$Pu(NO$$_{3}$$)$$_{6}$$の溶解度は減少した。晶析試験では、原料液のCs濃度が高いほどCs$$_{2}$$Pu(NO$$_{3}$$)$$_{6}$$の生成が促進し、Cs及びPuの除染係数が低下する傾向を示した。晶析工程におけるCs$$_{2}$$Pu(NO$$_{3}$$)$$_{6}$$の生成挙動について基礎データを取得した。

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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パーセンタイル:56.78

分野:Chemistry, Analytical

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