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Development of advanced reprocessing system based on precipitation method using high performance pyrrolidone derivatives, 3; Performance evaluation of pyrrolidone derivatives as UO$$_{2}$$$$^{2+}$$ -precipitant from a viewpoint of crystallography

Takao, Koichiro*; Noda, Kyoko*; Nogami, Masanobu*; Sugiyama, Yuichi*; Harada, Masayuki*; Ikeda, Yasuhisa*; Morita, Yasuji  ; Nishimura, Kenji*

We have been developing an advanced reprocessing system for spent FBR fuels based on precipitation method using pyrrolidone derivatives. Structural analyses of UO$$_{2}$$(NO$$_{3}$$)$$_{2}$$L$$_{2}$$ (L=11 kinds of pyrrolidone derivatives) have been carried out using X-ray diffraction method to obtain some useful data for the selection of the optimum precipitant. It was found that the U(VI) complex with N-iso-butyl-2-pyrrolidone makes the most compact crystal.

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