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Abstract

The evaluation of the radiological consequences associated with the migration of radionuclides released by a nuclear waste repository in a geological medium should take into account the evolution of the geosphere and consider internal phenomena associated with the presence of the wastes. In this study an assessment is made of groundwater flow modifications and their consequences on the radionuclide migration connected with the heat generation from vitrified high level wastes. It considers a crystalline site, with isotropic properties, modelled as an equivalent porous medium. The study shows that a first generation of models can take into account coupled phenomena, and that, using the chosen assumptions of the parameter values, the consequences on radionuclide migration in the framework of a normal evolution scenario are very slight. This can be explained by the behaviour of the radionuclides, which do not reach the zones where the flow is perturbed before the end of the thermal phase, when the initial flow is recovered. This study has to be validated. If the results are confirmed, it should allow phenomena associated with thermal effects to be disregarded when considering the migration of radionuclides in the geosphere related to the normal evolution scenario in crystalline rock.

Additional information

Authors: BENGAOUER A, CEA, Département des Etudes Mechaniques et Thermiques, Fontenay-aux-Roses (FR);ASTRUC R, CEA, Département des Etudes Mechaniques et Thermiques, Fontenay-aux-Roses (FR);STIETEL A, CEA, Département des Etudes Mechaniques et Thermiques, Fontenay-aux-Roses (FR);DURIN M, CEA, Département des Etudes Mechaniques et Thermiques, Fontenay-aux-Roses (FR)
Bibliographic Reference: EUR 13523 FR (1991) 165 pp., FS, ECU 13.75
Availability: (2)
ISBN: ISBN 92-826-2887-6
Record Number: 199111269 / Last updated on: 1994-12-02
Category: PUBLICATION
Original language: fr
Available languages: fr