Development of Advanced Reprocessing System Based on Precipitation Method Using Pyrrolidone Derivatives as Precipitants : Precipitation Behavior of U(VI), Pu(IV), and Pu(VI) by Pyrrolidone Derivatives with Low Hydrophobicity
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概要
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An advanced reprocessing system for spent FBR fuels based on two precipitation processes has been proposed. In the first process, only U(VI) species is precipitated using a pyrrolidone derivative (NRP) with lower hydrophobicity and donicity, which should yield a lower precipitation ability. In the second process, residual U(VI) and Pu(IV, VI) are precipitated simultaneously using an NRP with higher hydrophobicity and donicity, which should yield a higher precipitation ability. In order to select the precipitants for the first precipitation process, we have examined the precipitation behavior of U(VI), Pu(IV), and Pu(VI) species in HNO3 using N-n-propyl-2-pyrrolidone (NProP), N-n-butyl-2-pyrrolidone (NBP), and N-iso-butyl-2-pyrrolidone (NiBP) with lower hydrophobicity and donicity than N-cyclohexyl-2-pyrrolidone (NCP) previously proposed as the precipitant. It was found that NRPs could precipitate U(VI) nearly stoichiometrically and that the decontamination factors for simulated fission products were higher than those in NCP systems. Furthermore, as seen in NCP, it was found that in the U(VI)-Pu(IV) mixtures, a small amount of Pu(IV) was temporarily coprecipitated with U(VI) by NRPs in spite of their lower precipitation ability and then the coprecipitated Pu(IV) component was redissolved with continuous stirring. From these results, NRPs can be proposed as candidate precipitants for the first precipitation process. In particular, NBP is considered to be the most promising precipitant, because of the relatively high solubility of the NProP precipitant, the increases in viscosity of NiBP slurry with stirring, and the relatively fast sedimentation rate of NBP precipitates.
- 社団法人 日本原子力学会の論文
- 2009-12-01
著者
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Kim Seong-yun
Japan Atomic Energy Agency
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Ikeda Yujiro
Japan Atomic Energy Research Institue
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Kikuchi Toshiaki
Energy Project And Technol. Center Mitsubishi Materials Corp.
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MORITA Yasuji
Japan Atomic Energy Agency
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Harada M
Department Of Energy Conversion Engineering Kyushu University
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TAKAO Koichiro
Research Laboratory for Nuclear Reactors, Tokyo Institute of Technology
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KAWATA Yoshihisa
Japan Atomic Energy Agency
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HARADA Masayuki
Research Laboratory for Nuclear Reactors, Tokyo Institute of Technology
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NOGAMI Masanobu
Research Laboratory for Nuclear Reactors, Tokyo Institute of Technology
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NISHIMURA Kenji
Mitsubishi Materials Corporation
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IKEDA Yasuhisa
Research Laboratory for Nuclear Reactors, Tokyo Institute of Technology
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HATTA Masahisa
Ishikawajima-Harima Heavy Industries Co., Ltd.
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Ikeda Y
Research Laboratory For Nuclear Reactors Tokyo Institute Of Technology
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Ikeda Yasuhisa
Research Laboratory For Nuclear Reactors Tokyo Institute Of Technology
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Takao Koichiro
Research Laboratory For Nuclear Reactors Tokyo Institute Of Technology
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Kikuchi Toshiaki
Energy Project And Technology Center Mitsubishi Materials Corporation
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Ikeda Yasuhisa
Res. Lab. For Nuclear Reactors Tokyo Inst. Of Technol.
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Hatta Masahisa
Ishikawajima-harima Heavy Industries Co. Ltd.
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Nogami M
Research Laboratory For Nuclear Reactor Tokyo Institute Of Technology
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Nogami Masanobu
Research Laboratory For Nuclear Reactors Tokyo Institute Of Technology
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Harada Masayuki
Research Laboratory For Nuclear Reactors Tokyo Institute Of Technology
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Nishimura Kenji
Mitsubishi Material Co.
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Harada Masayuki
Research Laboratory For Nuclear Reactor Tokyo Institute Of Technology
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Takao Koichiro
Research Laboratory for Nuclear Reactor, Tokyo Institute of Technology
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Nogami Masanobu
Research Laboratory for Nuclear Reactor, Tokyo Institute of Technology
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