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Development of advanced reprocessing system using high selective and controllable precipitants, 6; Investigation on thermal decomposition behaviors of uranium-pyrrolidone compounds and fuel production steps

Shibahara, Takahiro*; Chikazawa, Takahiro*; Kikuchi, Toshiaki*; Nishimura, Kenji*; Morita, Yasuji; Ikeda, Yasuhisa*

Thermal decomposition of precipitants of U(VI) with pyrrolidone derivatives was investigated for the development of an advanced reprocessing system for spent FBR fuels based only on precipitation method using the pyrrolidone derivatives. We have examined N-cyclohexyl-2-pyrrolidone (NCP), N-n-butyl-2-pyrrolidone (NBP) and N-propyl-2-pyrrolidone (NProP) as the precipitants. It was found that U(VI) precipitates with those precipitants were decomposed at higher than 450 $$^{circ}$$C and such thermal treatment produced U oxides with low impurities.

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