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  • A Critical Evaluation of the Dissolution Mechanisms of High-level Waste Glasses in Conditions of Relevance for Geological Disposal (GLAMOR), EUR 23097
FP5

A Critical Evaluation of the Dissolution Mechanisms of High-level Waste Glasses in Conditions of Relevance for Geological Disposal (GLAMOR), EUR 23097

Project ID: FIKW-CT-2001-20140
Funded under: FP5-EAECTP C

Abstract

Different theories have been proposed worldwide in the past for interpreting the results from experimental programmes on the dissolution of nuclear waste glasses. The common and important trend is that the dissolution rate of nuclear waste glass decreases with increasing time of exposure to the contacting solution under static conditions. The interpretations are diverging in that the decrease may be attributed to saturation effects in the solution, to protecting effects of the reaction layer formed on the glass surface, or to ion exchange processes between solution and glass. Currently these different interpretations relate to either a thermodynamically (affinity) or with kinetically controlled dissolution behaviour.
The first objective of the GLAMOR project was to achieve a common understanding amongst the participants on the interpretation of the decrease in dissolution rate of nuclear waste glasses as observed in most experimental programmes and referring to geological disposal conditions. The project started from a selection of existing experimental data and existing analytical models as the basis of its work. A group of acknowledged international experts identified the experimental data to be used in the project and applied the models to the data. The experimental data were produced by various laboratories and under various experimental conditions (i.e. different glass compositions, pure solutions, solutions loaded with solids referring to disposal concepts). The second objective of the project was to better define and quantify the uncertainties associated with the calculations performed in modelling, for instance the uncertainty of the parameters used in the models. This modelling was done so that laboratory data would be properly interpreted and correctly extrapolated beyond the laboratory time scale of several years.

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Record Number: 8782 / Last updated on: 2007-11-29
Category: PROJ