The Application of an Advanced Ion Exchange Process to Reprocessing Spent Nuclear Fuels, (I). Separation Behavior of Fission Products from Uranium.

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  • WEI Yuezhou
    Nuclear Chemistry and Chemical Engineering Center, Institute of Research and Innovation
  • KUMAGAI Mikio
    Nuclear Chemistry and Chemical Engineering Center, Institute of Research and Innovation
  • TAKASHIMA Yoichi
    Nuclear Chemistry and Chemical Engineering Center, Institute of Research and Innovation
  • ASOU Masami
    Nuclear Power R&D Center, The Tokyo Electric Power Co., Inc.
  • NAMBA Takashi
    Nuclear Power R&D Center, The Tokyo Electric Power Co., Inc.
  • SUZUKI Kazuhiro
    Nuclear Power R&D Center, The Tokyo Electric Power Co., Inc.
  • MAEKAWA Akira
    Nuclear Fuel Planning Section, The Kansai Electric Power Co., Inc.
  • OHE Shinobu
    Nuclear Fuel Planning Section, The Kansai Electric Power Co., Inc.

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Other Title
  • The Application of an Advanced Ion Exchange Process to Reprocessing Spent Nuclear Fuels,(1)Separation Behavior of Fission Products from Uranium
  • The Application of an Advanced Ion Exch
  • Separation Behavior of Fission Products from Uranium

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Abstract

In order to develop an advanced ion exchange process for the reprocessing of spent nuclear fuels, a novel anion exchanger, AR-01 with the resin embedded in porous silica beads and benzimidazoles as functional groups has been manufactured. Adsorption behavior of various fission product elements (FPs) and uranium in nitric acid medium were investigated experimentally using this anion exchanger. Separation performance of FPs from U(VI) in simulated spent fuel solutions was demonstrated by column chromatography utilizing dilute HNO3 and thiourea as eluents.<BR>Most FPs such as Cs(I), Sr(II), Mo(VI), Rh(III) and trivalent rare earths showed negligibly slight adsorption and could be separated from U(VI) satisfactorily. Cerium(IV) was strongly adsorbed, but was gradually reduced to non-adsorptive Ce(III) by the anion exchanger. Zirconium(IV) presented weak adsorption and its a part mixed with U(VI) in the column experiments. Ruthenium(III) exhibited quite strong adsorption in a broad HNO3 concentration range as the form of anionic nitrosylnitrato-complexes, its most amount mixed with U(VI). Palladium(II) showed significantly strong adsorption probably due to complexes formation with the anion exchanger. The adsorbed Pd(II) was effectively eluted out by thiourea and separated from U(VI) and other FPs completely.

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