Abstract
Abstract The effects of hydrothermal alteration of a granite due to the emplacement of a disposal facility for high-level radioactive waste has been evaluated, integrating the results of a study of a natural analogue, laboratory experiments and reaction-path modelling. The alteration, whose extent was related to the thermal energy emitted by the wastes, corresponded to a phase dissolution of primary minerals, followed by a phase of precipitation. Two aspects of alteration were favourable to the isolation of wastes: a decrease in porosity of the rock and an increase in sorption potential. It was possible to predict the rock volume involved in alteration around the disposal site, as well as the nature and the volume of alteration minerals. Thereby, it was possible to evaluate the sorption potential of the rock as a function of alteration. From these calculations, it appears, for instance, that any Cs, U and actinides released by the waste packages could be fixed inside the granite occurring in the near-field.
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