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Development of advanced reprocessing system using high selective and controllable precipitants, 1; Examination of optimal conditions for the precipitation using compounds with low donicity and hydrophobicity

Harada, Masayuki*; Ikeda, Yasuhisa*; Asakura, Toshihide; Morita, Yasuji  ; Nogami, Masanobu*; Nishimura, Kenji*

Precipitation behavior of U(VI), Pu(IV) and Pu(VI) with pyrrolidone derivatives of N-butyl-2-pyrrolidone (NBP) and N-propyl-2-pyrrolidone (NProP) was examined to develop a simple and economical reprocessing process of spent nuclear fuel based only on precipitation method. These precipitants have lower donicity and hydrophobicity than N-cyclohexyl-2-pyrrolidone (NCP) which has already been examined for U(VI) precipitation. The addition of twice amount of the precipitant with molar ratio to U(VI) gave 70% precipitation of U(VI) from nitric acid solution of 2M U. Experiments on Pu precipitation behavior revealed that both NBP and NProP have lower ability to make precipitates of Pu(IV) and Pu(VI), which would contribute to the development of the efficient precipitation step only for U(VI).

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