A Study on Precipitation Behavior of Plutonium and Other Transuranium Elements with N-Cyclohexyl-2-pyrrolidone for Development of a Simple Reprocessing Process
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概要
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Precipitation behavior of Pu and other transuranium elements with a combustible organic reagent N-cyclohexyl-2-pyrrolidone (NCP) has been examined to develop a simple reprocessing process of spent nuclear fuel based only on precipitation method. Experiments on the precipitation behavior of Pu in HNO3 solution containing only Pu showed that both Pu(VI) and Pu(IV) were precipitated with NCP, but they required more NCP than in the U(VI) precipitation. Selective U(VI) precipitation from HNO3 solution containing U(VI) and Pu(IV) (U(VI)-Pu(IV) solution) was achieved by stirring the solution for sufficient time after addition of NCP with ratio of [NCP]/[U] = 1.4. Addition of an enough amount of NCP to U(VI)-Pu(VI) or U(VI)-Pu(IV) solutions gave a quantitative precipitation of both U and Pu. From a viewpoint of the physical property of the precipitate, Pu(VI) was found to be favorable for the U-Pu precipitation. Hence, we have studied the oxidation of Pu(IV) to Pu(VI). As a result, heating of the solution was found to be a promising method for the present process. Furthermore, it was clarified that neither Am(III) nor Np(V) was precipitated in the selective U precipitation and the simultaneous U-Pu precipitation. These results demonstrate the feasibility of the reprocessing by precipitation with NCP.
- 社団法人 日本原子力学会の論文
- 2007-03-25
著者
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CHIKAZAWA Takahiro
Mitsubishi Materials Corporation
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KIKUCHI Toshiaki
Mitsubishi Materials Corporation
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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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KAWATA Yoshihisa
Japan Atomic Energy Agency
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IKEDA Yasuhisa
Research Laboratory for Nuclear Reactors, Tokyo Institute of Technology
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KAWATA Yoshihisa
Mitsubishi Materials Corporation
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MINEO Hideaki
Japan Atomic Energy Agency
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KOSHINO Nobuyoshi
Research Laboratory for Nuclear Reactors, Tokyo Institute of Technology
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ASANUMA Noriko
Research Laboratory for Nuclear Reactors, Tokyo Institute of Technology
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YAMASAKI Kazuhiko
Mitsubishi Materials Corporation
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TAMAKI Yoshihisa
Mitsubishi Materials Corporation
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ASANUMA Noriko
Department of Energy Science and Engineering, Tokai University
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Asanuma Noriko
Department Of Energy Science And Engineering Tokai University
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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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Kikuchi Toshiaki
Energy Project And Technology Center Mitsubishi Materials Corporation
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CHIKAZAWA Takahiro
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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Koshino Nobuyoshi
Research Laboratory For Nuclear Reactors Tokyo Institute Of Technology
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Asanuma Noriko
Research Laboratory For Nuclear Reactors Tokyo Institute Of Technology
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