Nuclear Engineering and Technology

  • 제55권4호
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  • Pages.1300-1309
  • /
  • 2023
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  • 1738-5733(pISSN)
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  • 2234-358X(eISSN)
한국원자력학회 (Korean Nuclear Society)
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Phase analysis of simulated nuclear fuel debris synthesized using UO2, Zr, and stainless steel and leaching behavior of the fission products and matrix elements

  • Ryutaro Tonna (Department of Nuclear Engineering, Kyoto University) ;
  • Takayuki Sasaki (Department of Nuclear Engineering, Kyoto University) ;
  • Yuji Kodama (Department of Nuclear Engineering, Kyoto University) ;
  • Taishi Kobayashi (Department of Nuclear Engineering, Kyoto University) ;
  • Daisuke Akiyama (Institute of Multidisciplinary Research for Advanced Materials (IMRAM), Tohoku University) ;
  • Akira Kirishima (Institute of Multidisciplinary Research for Advanced Materials (IMRAM), Tohoku University) ;
  • Nobuaki Sato (Institute of Multidisciplinary Research for Advanced Materials (IMRAM), Tohoku University) ;
  • Yuta Kumagai (Nuclear Science and Engineering Center, Japan Atomic Energy Agency (JAEA)) ;
  • Ryoji Kusaka (Nuclear Science and Engineering Center, Japan Atomic Energy Agency (JAEA)) ;
  • Masayuki Watanabe (Nuclear Science and Engineering Center, Japan Atomic Energy Agency (JAEA))
  • 투고 : 2022.07.30
  • 심사 : 2022.12.14
  • 발행 : 2023.04.25
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초록

Simulated debris was synthesized using UO2, Zr, and stainless steel and a heat treatment method under inert or oxidizing conditions. The primary U solid phase of the debris synthesized at 1473 K under inert conditions was UO2, whereas a (U, Zr)O2 solid solution formed at 1873 K. Under oxidizing conditions, a mixture of U3O8 and (Fe, Cr)UO4 phases formed at 1473 K, whereas a (U, Zr)O2+x solid solution formed at 1873 K. The leaching behavior of the fission products from the simulated debris was evaluated using two methods: the irradiation method, for which fission products were produced via neutron irradiation, and the doping method, for which trace amounts of non-radioactive elements were doped into the debris. The dissolution behavior of U depended on the properties of the debris and aqueous solution for immersion. Cs, Sr, and Ba leached out regardless of the primary solid phases. The leaching of high-valence Eu and Ru ions was suppressed, possibly owing to their solid-solution reaction with or incorporation into the uranium compounds of the simulated debris.

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과제정보

This work was supported by the JAEA Nuclear Energy S&T and Human Resource Development Project through concentrated wisdom, grant number JPJA18P18071886. The authors would like to acknowledge Dr. Shun Sekimoto and the staff at the Institute for Integrated Radiation and Nuclear Science, Kyoto University (KURNS), for their significant contributions to the experiments. The authors would also like to express their gratitude to the members of the research reactor group at KURNS for their help with the neutron irradiation experiments and for allowing us to use the KUR supported by Kyoto University.

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