The leaching of Se, Sn, Zr, Pd from vitrified high-level waste in clay slurries

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Abstract

79Se, 126Sn, 93Zr, and 107Pd are amongst the most critical radionuclides for the long-term safety of geological disposal of vitrified high-level waste or spent fuel in the Boom Clay candidate formation in Belgium. We therefore investigated the leaching behaviour of their inactive isotopes from reference HLW glass SON68, and we determined in particular the steady-state concentrations in near-field conditions of these elements. Some of the most important conclusions of this study are: - release of the radioactive Se, Sn, Pd, Zr from HLW glass does not seem to increase their respective element concentration in the pore solution of a natural Boom Clay environment - the Se (VI) release is not solubility limited, whereas Sn, Pd, Zr are solubility limited

Details

Original languageEnglish
Title of host publicationMobile Fission and Activation Products in Nuclear Waste Disposal. Workshop Proceedings
Place of PublicationIssy-les-Moulineaux, France
Pages247-257
Publication statusPublished - Aug 2009
EventMobile Fission and Activation Products in Nuclear Waste Disposal - OECD/NEA, La Baule, France
Duration: 16 Jan 200719 Jan 2007

Conference

ConferenceMobile Fission and Activation Products in Nuclear Waste Disposal
Country/TerritoryFrance
CityLa Baule
Period2007-01-162007-01-19

Keywords

  • high-level waste glass, 79Se, 126Sn, 93Zr, 107Pd, Boom Clay, leaching, solubility, speciation

ID: 182627