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Solubility Constraint: An Important Consideration in Safety Assessment of Nuclear Waste Disposal

Published online by Cambridge University Press:  25 February 2011

Dhanpat Rai  and
Jack L. Ryan
Dhanpat Rai
Affiliation:
Pacific Northwest Laboratory, Richland, Washington 99352
Jack L. Ryan
Affiliation:
Pacific Northwest Laboratory, Richland, Washington 99352
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Abstract

Solubilities of key solid compounds that are either present in the waste form or can readily precipitate from waste package leachates under repository conditions can be used to set maximum limits on radionuclide concentrations expected in groundwater. This is because the solubility limited concentrations are independent of the release scenarios, hydrologic transport characteristics, and adsorption/desorption reactions. Some of the important factors that control solubilities are pH, pe, type of solid phase, and nature of complexing ligands in the ground waters. Most of the above factors are affected by radiolysis due to the inherent radiation field of the waste form. Experimental results pertaining to the solubilities of selected Am, U, Np, and Pu compounds and the effects of radiolysis are discussed. These results show that: 1) at expected repository pH and reducing conditions, solubility controlled concentrations of several actinides are low and near acceptable limits, 2) the redox conditions at the waste form-water interface may be very oxidizing due to radiolyticeffects, despite the fact that normal repository conditions are assumed to be reducing, 3) additional data on solubility limits and key thermodynamic parameters are needed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 26: Symposium D – Scientific Basis for Nuclear Waste Management VII , 1983 , 805
Copyright
Copyright © Materials Research Society 1984

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