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Abstract

The purpose of this study is to assess the modification of the flow pattern inside a granitic rock mass due to the thermal loading created by a radioactive waste repository. Data collected on the French site of Auriat are used for simulations with the numerical code METIS. The natural medium is represented by a vertical cross section covering several kilometers and integrating major inlets and outlets. The model describes the coupled flow and heat movement. Three possible geometries of the repository are envisioned, corresponding to a more or less compact arrangement of the canisters and to different durations of preliminary storage. For the reference values of the parameters as well as for realistic variations, the heat transfer is shown to be independent of the flow, which in turn is feebly modified by the temperature rise. The thermal phase extends on a period of 10000 years approximately, with a maximum temperature increase of about 120 degrees. The behaviour of a source diluted in the total volume containing the repository is compared with a refined local model. The discrepancy between the two models vanishes after 100 years. An optimum discretization of the repository zone is defined by comparison to analytical solutions. Finally the continuous medium model is compared to a double medium model describing the role of the fractures. The continuous model is shown to be satisfactory for the range of parameters characteristic of the Auriat site.

Additional information

Authors: GOBLET P ECOLE DES MINES - CIG, FONTAINEBLEAU (FRANCE), ECOLE DES MINES - CIG, FONTAINEBLEAU (FRANCE)
Bibliographic Reference: EUR 10509 FR (1986) MF, VOL. II,121 P., BFR 300, BLOW-UP COPY BFR 625, EUROFFICE, LUXEMBOURG, POB 1003
Availability: Can be ordered online
Record Number: 1989126031501 / Last updated on: 1989-01-01
Category: PUBLICATION
Available languages: fr