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CORALUS: An Integrated In Situ Corrosion Test on α-Active HLW Glass

Published online by Cambridge University Press:  21 March 2011

Elie Valcke ,
Steven Smets ,
Serge Labat ,
Karel Lemmens ,
Pierre Van Iseghem ,
Peter Thomas ,
Nicole Godon ,
Patrick Jollivet ,
Géraldine Parisot  and
Jean-Pierre Mestre
...Show all authors
Elie Valcke
Affiliation:
SCK•CEN, Boeretang 200, 2400 Mol, Belgium
Steven Smets
Affiliation:
SCK•CEN, Boeretang 200, 2400 Mol, Belgium
Serge Labat
Affiliation:
SCK•CEN, Boeretang 200, 2400 Mol, Belgium
Karel Lemmens
Affiliation:
SCK•CEN, Boeretang 200, 2400 Mol, Belgium
Pierre Van Iseghem
Affiliation:
SCK•CEN, Boeretang 200, 2400 Mol, Belgium
Peter Thomas
Affiliation:
SCK•CEN, Boeretang 200, 2400 Mol, Belgium
Nicole Godon
Affiliation:
CEA-Valrhô, B.P. 17171, 30207 Bagnols-sur-Cèze, France
Patrick Jollivet
Affiliation:
CEA-Valrhô, B.P. 17171, 30207 Bagnols-sur-Cèze, France
Géraldine Parisot
Affiliation:
CEA-Valrhô, B.P. 17171, 30207 Bagnols-sur-Cèze, France
Jean-Pierre Mestre
Affiliation:
CEA-Valrhô, B.P. 17171, 30207 Bagnols-sur-Cèze, France
Norbert Jockwer
Affiliation:
GRS-Braunschweig, Theodor Heuss Strasse 4, 38122 Braunschweig, Germany
Klaus Wieczorek
Affiliation:
GRS-Braunschweig, Theodor Heuss Strasse 4, 38122 Braunschweig, Germany
Claudine Pozo
Affiliation:
CEA-Cadarache, 13108 St. Paul lez Durance, France
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Abstract

Integrated in situ corrosion tests with α-doped SON68 glass samples have been and are still being performed in the HADES underground laboratory in Mol, Belgium. Two test tubes have been dismantled, and the glass and clay samples have been analysed (mass loss, SEM, EDS, SIMS,…). The results on glass corrosion largely respond to the expectations and agree very well with results from surface laboratory tests and modelling predictions. The glass alteration is about two orders of magnitude higher at 90 °C than at 30 °C. The addition of powdered glass frit to a Ca-bentonite backfill reduces the glass alteration by two orders of magnitude in comparison with another backfill, dried Boom Clay. The α-doped glass samples were shown to have slightly thicker alteration layers. The thickness seemed to increase with increasing αβγ-activity. Because of the lack of sufficient data on mass loss, we cannot conclude that also the degree of alteration is higher for these samples. Under the thermal gradient in the test tubes, the reaction of Cabentonite with the glass samples and the powdered glass frit dispersed within the bentonite results in the neo-formation of non-swelling 7 Å minerals.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 932: Symposium – Scientific Basis for Nuclear Waste Management XXIX , 2006 , 118.1
Copyright
Copyright © Materials Research Society 2006

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