Leaching and migration of Np, Pu, and Am from α-doped SON68 HLW glass in contact with dense clay

Elie Valcke, Mireille Gysemans, Hugo Moors, Pierre Van Iseghem, Nicole Godon, Patrick Jollivet

    Research outputpeer-review

    Abstract

    In the frame of an integrated in situ test on the alteration of the SON68 reference glass in realistic disposal conditions, the leaching of Np, Pu, and Am from α-doped SON68 glass samples and their migration in three clay-based backfill materials at high density was measured. The addition of powdered glass frit to a Ca-bentonite decreased the glass alteration by two orders of magnitude, and resulted in a concomitant decrease of the radionuclide leaching in comparison with dried Boom Clay, which is the more agressive backfill. All actinides were selectively retained in the alteration layer, but the retention degree was lower for Np than for Pu and Am. All backfill materials proved to be efficient barriers against radionuclide migration. For nearly all radionuclides and backfill materials, the migration profile showed a contribution of colloidal transport.

    Original languageEnglish
    Title of host publication29th International Symposium on the Scientific Basis for Nuclear Waste Management XXIX
    Place of PublicationWarrendale, United States
    PublisherMRS - Materials Research Society
    Pages999-1006
    Number of pages8
    ISBN (Print)1558998896, 9781558998896
    DOIs
    StatePublished - 2006
    Event2005 - MRS : 29th International Symposium on the Scientific Basis for Nuclear Waste Management - Gent
    Duration: 12 Sep 200516 Sep 2005

    Publication series

    NameMaterials Research Society Symposium Proceedings
    Volume932
    ISSN (Print)0272-9172

    Conference

    Conference2005 - MRS
    Abbreviated titleMRS2005
    Country/TerritoryBelgium
    CityGent
    Period2005-09-122005-09-16

    ASJC Scopus subject areas

    • General Materials Science
    • Condensed Matter Physics
    • Mechanics of Materials
    • Mechanical Engineering

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