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Résumé

A laboratory predetermination of retention mechanisms of radionuclides migrating outside the primary waste containers in repository surroundings was started up. Backfillings materials (clay and sand) as well as granite and its weathering products are concerned here. A method allowing the evaluation of the sorption and desorption of radionuclides of the surfaces of fractures by measuring surface retention coefficients, had initially been started up as well as a laboratory device developed for experiments in a reducing environment. The experiments have consisted of studying the sorbing properties of granite minerals of Auriat and its weathering products and of determining the retention of Np, Pu, AM, CS and Sr on the surface fractures of this granite. The influence of a reducing environment on the behaviour of activities has been studied. Complementary percolation tests have also been carried out on clays, at raised temperature and under irradiation. These experiments have enabled a deeper knowledge of retention mechanisms, the taking of parametric sensitivity measurements and the preparation of elaborating more performing experimental devices which included the parameters needed for a realistic simulation of transfer phenomena.

Informations supplémentaires

Auteurs: RANON D, CEA, FONTENAY-AUX-ROSES (FRANCE);MIARA P, CEA, FONTENAY-AUX-ROSES (FRANCE);VINSON J M, CEA, FONTENAY-AUX-ROSES (FRANCE);PETRONIN J C, CEA, FONTENAY-AUX-ROSES (FRANCE);DOZOL J F CEA, FONTENAY-AUX-ROSES (FRANCE), CEA, FONTENAY-AUX-ROSES (FRANCE)
Références bibliographiques: EUR 10490 FR (1986) MF, 133 P., BFR 300, BLOW-UP COPY BFR 675, EUROFFICE, LUXEMBOURG, POB 1003
Disponibilité: Can be ordered online