CORALUS: an integrated in situ test on the corrosion of α-active (SON68) HLW glass

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Abstract

Integrated in situ corrosion tests with α-doped SON68 (R7T7) glass samples have been performed in the HADES underground research facility in Mol, Belgium. The results on glass corrosion (effect of temperature, effect of addition of powdered glass frit, glass alteration mechanism) relate well to the expectations. Taking into account the loss of part of the alteration layer of the in situ corroded samples and the fact that the hypotheses in the model are not fully valid, the results agree also well with results from surface laboratory tests and modelling predictions with LIXIVER2. The α-doped glass samples showed slightly thicker alteration layers, and thickness seemed to increase with increasing αβγ-activity of the sample. In combination with the decreased glass alteration, the addition of powdered glass frit to a Ca-bentonite decreased the leaching of Np, Pu, and Am. In many cases, the migration profiles of these radionuclides showed a contribution of colloidal transport. Under the thermal gradient in the test tubes, the reaction of Ca-bentonite with the powdered glass frit resulted in the neo-formation of non-swelling 7Å minerals. The relevance of the results for the performance of a final repository for HLW glass is discussed.

Details

Original languageEnglish
Title of host publicationRadioactive waste disposal in geological formations. Proceedings
Place of PublicationBraunschweig, Germany
Pages187-198
Volume1
Publication statusPublished - Nov 2008
EventREPOSAFE 2007. International conference on radioactive waste disposal in geological formations - Budesamt für Strahlenschutz (BfS) and Gesellshaft für Anlagen- und Reaktorsicherheit (GRS), Braunschweig, Germany
Duration: 5 Nov 20079 Nov 2007

Conference

ConferenceREPOSAFE 2007. International conference on radioactive waste disposal in geological formations
CountryGermany
CityBraunschweig
Period2007-11-052007-11-09

Keywords

  • in situ tests, HLW, glass corrosion, leaching, migration, diffusion, Boom clay, waste disposal

ID: 74509