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Chemical Durability of Yttria-Stabilized Zirconia for Highly Concentrated TRU Wastes

Published online by Cambridge University Press:  10 February 2011

Hajime Kinoshita
Affiliation:
Department of Nuclear Engineering, Osaka University, Yamada-oka 2-1, Suita, Osaka 565-0871 JAPAN, khaji@nucl.eng.osaka-u.ac.jp
Ken-ichi Kuramoto
Affiliation:
Department of Nuclear Energy System, Japan Atomic Energy Research Institute, Ibaraki 319-1195 JAPAN
Masayoshi Uno
Affiliation:
Department of Nuclear Engineering, Osaka University, Yamada-oka 2-1, Suita, Osaka 565-0871 JAPAN, khaji@nucl.eng.osaka-u.ac.jp
Shinsuke Yamanaka
Affiliation:
Department of Nuclear Engineering, Osaka University, Yamada-oka 2-1, Suita, Osaka 565-0871 JAPAN, khaji@nucl.eng.osaka-u.ac.jp
Hisayoshi Mitamura
Affiliation:
Department of Environmental Sciences, Japan Atomic Energy Research Institute, Ibaraki 319-1195 JAPAN
Tsunetaka Banba
Affiliation:
Department of Environmental Sciences, Japan Atomic Energy Research Institute, Ibaraki 319-1195 JAPAN
Corresponding
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Abstract

Neptunium has an extremely long half-life and will be the main toxic element in the later stage of disposal. Yttria-Stabilized Zirconia (YSZ), with a fluorite structure, samples doped with Np-237 in high concentration (20, 30, 40 mol %) were fabricated (sintered in Air or Ar, at 1773 K, for 80 hours), and their leaching test (in deionized water, at 423 K, for 84 days) was carried out. The results indicated that the obtained leaching rates were much smaller than those of the Synroc and glass waste form, and that the increase in Np content did not cause any drastic changes in the leaching rates of Zr, Y, or Np. They were also compared to the results of YSZ doped with Ce or Nd used as surrogates for actinides. The work showed that YSZ doped with Np in high concentration has an excellent chemical durability

Type
Research Article
Copyright
Copyright © Materials Research Society 2000

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