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Temperature Dependence of R7T7 Nuclear Waste Glass Alteration Mechanisms

Published online by Cambridge University Press:  28 February 2011

E. Y. Vernaz ,
J L. Dussossoy  and
S. Fillet
E. Y. Vernaz
Affiliation:
CEA. CEN/VALRHO, DRDD/SDHA, BP. 171, 30205 Bagnols sur Cèze Cedex, France
J L. Dussossoy
Affiliation:
CEA. CEN/VALRHO, DRDD/SDHA, BP. 171, 30205 Bagnols sur Cèze Cedex, France
S. Fillet
Affiliation:
CEA. CEN/VALRHO, DRDD/SDHA, BP. 171, 30205 Bagnols sur Cèze Cedex, France
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Abstract

The French LWR reference glass R7T7 was leached at temperatures between 100°C and 300°C at a pressure of 10 MPa.

An activation energy of 25 kJ/mole was found between 100°C and 250°C which is different from the 60 kJ/mole previously found between 25°C and 70°C. It is suggested that a potential glass hydration mechanism becomes predominant when dissolution is significantly slowed by high concentrations of silica in solution. At 300°C, a complete change in the corrosion mechanisms is found as the glass undergoes a rapid hydrothermal alteration

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 112: Symposium P – Scientific Basis for Nuclear Waste Management XI , 1987 , 555
Copyright
Copyright © Materials Research Society 1988

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References

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