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Effects of MgO on the Short- and Long-Term Stability of R7T7 and M7 Nuclear Waste Glass in Aqueous Media

Published online by Cambridge University Press:  01 January 1992

T. Advocat ,
J.L. Crovisier ,
J.L. Dussossoy  and
E. Vernaz
T. Advocat
Affiliation:
CEA CEN-VALRHO, Marcoule, BP 171, F-30207 Bagnols-sur-Cèze, France
J.L. Crovisier
Affiliation:
CGS-CNRS, 1 rue Blessig, F-67000 Strasbourg, France
J.L. Dussossoy
Affiliation:
CEA CEN-VALRHO, Marcoule, BP 171, F-30207 Bagnols-sur-Cèze, France
E. Vernaz
Affiliation:
CEA CEN-VALRHO, Marcoule, BP 171, F-30207 Bagnols-sur-Cèze, France
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Abstract

Experiments were conducted in initially pure water at 90°C and 100°C with glass specimens enriched in MgO and in alkali metals relative to the standard light water R7T7 reference glass. Three experimental protocols were implemented: Soxhlet testing with leachant renewal, static leaching according to a modified MCC-1 method with an SA/V ratio of 50 m−1, and static leaching with glass powder for an SA/V ratio of 8000 m−1 The results clearly show that the short and, especially, the long term dissolution rates depend on the initial glass composition. Higher MgO, Na2O, Li2O and B2O3 concentrations reduce the glass resistance to aqueous corrosion, as already indicated by the calculated hydration energy values. These experiments illustrate the importance of the glass composition in insuring long-term material integrity.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 294: Symposium V – Scientific Basis for Nuclear Waste Management XVI , 1992 , 177
Copyright
Copyright © Materials Research Society 1993

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References

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