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Modelling of Waste Form Performance and System Release

Published online by Cambridge University Press:  26 February 2011

Aaron Barkatt ,
Pedro B. Macedo ,
Barbara C. Gibson  and
Charles J. Montrose
Aaron Barkatt
Affiliation:
Vitreous State LaboratoryThe Catholic University of AmericaWashington, D.C. 20064
Pedro B. Macedo
Affiliation:
Vitreous State LaboratoryThe Catholic University of AmericaWashington, D.C. 20064
Barbara C. Gibson
Affiliation:
Vitreous State LaboratoryThe Catholic University of AmericaWashington, D.C. 20064
Charles J. Montrose
Affiliation:
Vitreous State LaboratoryThe Catholic University of AmericaWashington, D.C. 20064
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Abstract

Kinetic and thermodynamic approaches to the derivation of long-term release rates of species from defense waste glass are reviewed. It is concluded that at high flow rates kinetic factors are pre-dominant, while at low flow rates saturation of the aqueous medium with respect to major matrix elements, particularly with respect to silica present in the glass and in its alteration products, becomes a controlling factor. Quantitative calculations indicate that under likely repository conditions the release rates can be expected, in general, to fall below the NRC criterion of 10−5 yr−1.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 44: Symposium N – Scientific Basis for Nuclear Waste Management VIII , 1984 , 3
Copyright
Copyright © Materials Research Society 1985

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