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Dissolution of a Multiphase Waste Form

Published online by Cambridge University Press:  11 February 2011

Michele A. Lewis ,
Nancy L. Dietz  and
Thomas H. Fanning
Michele A. Lewis
Affiliation:
Argonne National Laboratory 9700 S. Cass Avenue Argonne, IL 60439
Nancy L. Dietz
Affiliation:
Argonne National Laboratory 9700 S. Cass Avenue Argonne, IL 60439
Thomas H. Fanning
Affiliation:
Argonne National Laboratory 9700 S. Cass Avenue Argonne, IL 60439
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Abstract

The dissolution behavior of the ceramic waste form (CWF) is being investigated to support its qualification for disposal in the proposed repository at Yucca Mountain. The CWF consists of sodalite and glass phases and has been consolidated either by hot isostatic pressuring (HIP) or by pressureless consolidation (PC). In this paper we compare the dissolution behavior of the two materials using in MCC-1 type tests at 90°C in a simulated silicate groundwater. The test solutions were periodically exchanged limit feedback effects. The solid surface area to volume ratio was 10 m-1. Five types of samples were tested: (1) HIP CWF, (2) binder glass vitrified by HIP, (3) PC CWF, (4) binder glass vitrified by PC, and HIP sodalite. Boron releases were used to monitor glass dissolution; these were similar in tests with HIP CWF, HIP glass, and PC CWF, but about 3X higher in tests with PC glass. At the end of the tests, the surfaces of the reacted materials were examined with scanning electron microscopy for signs of preferential dissolution. Differences in the dissolution behaviors of the materials are described and the implications of the test results regarding the performance of the CWF in the disposal system are discussed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 757: Symposium II – Scientific Basis for Nuclear Waste Management XXVI , 2002 , II6.7
Copyright
Copyright © Materials Research Society 2003

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References

REFERENCES

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