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Long-term behavior of R7T7-type nuclear glass: Current state of knowledge and outlook

Published online by Cambridge University Press:  17 March 2011

S. Gin ,
N. Godon ,
I. Ribet ,
P. Jollivet ,
Y. Minet ,
P. Frugier ,
E. Vernaz ,
J.M. Cavedon ,
B. Bonin  and
R. Do Quang
S. Gin
Affiliation:
CEA Valrhô, DEN/DTCD, BP 17171, 30207 Bagnols sur Cèze Cedex, France
N. Godon
Affiliation:
CEA Valrhô, DEN/DTCD, BP 17171, 30207 Bagnols sur Cèze Cedex, France
I. Ribet
Affiliation:
CEA Valrhô, DEN/DTCD, BP 17171, 30207 Bagnols sur Cèze Cedex, France
P. Jollivet
Affiliation:
CEA Valrhô, DEN/DTCD, BP 17171, 30207 Bagnols sur Cèze Cedex, France
Y. Minet
Affiliation:
CEA Valrhô, DEN/DTCD, BP 17171, 30207 Bagnols sur Cèze Cedex, France
P. Frugier
Affiliation:
CEA Valrhô, DEN/DTCD, BP 17171, 30207 Bagnols sur Cèze Cedex, France
E. Vernaz
Affiliation:
CEA Valrhô, DEN/DTCD, BP 17171, 30207 Bagnols sur Cèze Cedex, France
J.M. Cavedon
Affiliation:
CEA Saclay, DDIN/HAVL, 91191 Gif sur Yvette Cedex, France
B. Bonin
Affiliation:
COGEMA, COGEMA, BP 4, 78141 Vélizy Cedex, France Now at: CEA SACLAY DEN/DS, 91191 Gif sur Yvette Cedex, France
R. Do Quang
Affiliation:
COGEMA, COGEMA, BP 4, 78141 Vélizy Cedex, France
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Abstract

This article reviews current knowledge of the long-term behavior of R7T7-type glass during the thermal phase and in geological repository conditions (aqueous alteration). In interim storage R7T7 glass can be considered to conserve its integrity over time. In geological repository conditions, the mechanisms of glass alteration by water have been identified and parameter values have been assigned to the reaction kinetics for wide variations of the influential factors (temperature, pH, flow rate, S/V ratio, etc.). CEA has developed an operational model to obtain robust and reasonably conservative predictions of the glass quantities altered after disposal. Examples of applications of the operational model are discussed, future research topics are also proposed to consolidate this approach.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 824: Symposium CC – Scientific Basis for Nuclear Waste Management XXVIII , 2004 , CC5.7
Copyright
Copyright © Materials Research Society 2004

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