Radionuclide solubility and speciation studies for the Yucca Mountain site characterization project

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Yucca Mountain, Nevada, USA, is being investigated for its suitability as a potential site for a geologic nuclear waste repository. As part of the site characterization studies, actinide solubilities and speciations were studied at pH 6, 7, and 8.5 at 25{degrees}C in two different groundwaters from the vicinity of Yucca Mountain. The groundwaters differ substantially in total dissolved carbonate concentration, and to a lesser extent in ionic strength. In the waters with higher carbonate content, the solubilities of neptunium(V) decreased, whereas those americium(III) increased at 25{degrees}KC and decreased at 60{degrees}C. The solids formed were sodium neptunium carbonates and americium hydroxycarbonates. ... continued below

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7 p.

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Nitsche, H.; Roberts, K.; Prussin, T.; Keeney, D.; Carpenter, S.A.; Becraft, K. et al. December 1, 1992.

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Description

Yucca Mountain, Nevada, USA, is being investigated for its suitability as a potential site for a geologic nuclear waste repository. As part of the site characterization studies, actinide solubilities and speciations were studied at pH 6, 7, and 8.5 at 25{degrees}C in two different groundwaters from the vicinity of Yucca Mountain. The groundwaters differ substantially in total dissolved carbonate concentration, and to a lesser extent in ionic strength. In the waters with higher carbonate content, the solubilities of neptunium(V) decreased, whereas those americium(III) increased at 25{degrees}KC and decreased at 60{degrees}C. The solids formed were sodium neptunium carbonates and americium hydroxycarbonates. Plutonium solubilities did not significantly change with changing water composition because the solubility-controlling solids were mostly amorphous Pu(IV) polymers that contained only small amounts of carbonate.

Physical Description

7 p.

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INIS; OSTI as DE93010444

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  • 10. international high-level radioactive waste management conference, Las Vegas, NV (United States), 25-29 Apr 1993

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  • Other: DE93010444
  • Report No.: LBL--32874
  • Report No.: CONF-930408--53
  • Grant Number: AC03-76SF00098
  • Office of Scientific & Technical Information Report Number: 138743
  • Archival Resource Key: ark:/67531/metadc624520

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  • December 1, 1992

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  • June 16, 2015, 7:43 a.m.

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  • April 5, 2016, 12:06 p.m.

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Nitsche, H.; Roberts, K.; Prussin, T.; Keeney, D.; Carpenter, S.A.; Becraft, K. et al. Radionuclide solubility and speciation studies for the Yucca Mountain site characterization project, article, December 1, 1992; California. (digital.library.unt.edu/ark:/67531/metadc624520/: accessed September 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.