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Dissolution Rates of DWPF Glasses from Long-TermPCT

Published online by Cambridge University Press:  03 September 2012

W. L. Ebert  and
S.-W. Tam
W. L. Ebert
Affiliation:
Chemical Technology Division, Argonne National Laboratory, Argonne, IL 60439
S.-W. Tam
Affiliation:
Chemical Technology Division, Argonne National Laboratory, Argonne, IL 60439
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Abstract

We have characterized the corrosion behavior of several Defense WasteProcessing Facility (DWPF) reference waste glasses by conducting staticdissolution tests with crushed glasses. Glass dissolution rates werecalculated from measured B concentrations in tests conducted for up to fiveyears. The dissolution rates of all glasses increased significantly aftercertain alteration phases precipitated. Calculation of the dissolution rateswas complicated by the decrease in the available surface area as the glassdissolves. We took the loss of surface area into account by modeling theparticles to be spheres, then extracting from the short-term test resultsthe dissolution rate corresponding to a linear decrease in the radius ofspherical particles. The measured extent of dissolution in tests conductedfor longer times was less than predicted with this linear dissolution model.This indicates that advanced stages of corrosion are affected by anotherprocess besides dissolution, which we believe to be associated with adecrease in the precipitation rate of the alteration phases. These resultsshow that the dissolution rate measured soon after the formation of certainalteration phases provides an upper limit for the long-term dissolutionrate, and can be used to determine a bounding value for the source term forradionuclide release from waste glasses. The long-term dissolution ratesmeasured in tests at 20,000 m−1 at 90°C in tuff groundwater at pHvalues near 12 are about 0.2,0.07, and 0.04 g/(m2•d) for theEnvironmental Assessment glass and glasses made with SRL 131 and SRL 202frits, respectively.

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Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 465: Symposium II – Scienfific Basis for Nuclear Waste Management XX , 1996 , 149
Copyright
Copyright © Materials Research Society 1997

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References

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