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The purpose of this study was to test a methodology of representation of a radioactive waste repository, based on the data collected on the granite Auriat site and on the modelling tools developped around the METIS code. A critical review of the available data is done to assess their utility in a modelling exercise. A two dimensional model of a vertical cross-section covering several kilometers was built, integrating major regional inlets and outlets. Various representations of the results are proposed: piezometric head maps, vertical velocity profiles, flow lines, residence time maps. 3 situations of the rock mass were simulated: - Hydraulic state before the drilling of the galleries: the influence of boundary conditions, as well as of the conductivity field, is studied: the effect of major regional fault zones of high conductivity is examined. A very low correlation is shown between the water flux at repository level and the surface hydrology. - Transient situation due to the opening of the galleries: this phase is shown to be probably long compared to the active period of the storage. No unwatering is to be expected in the rock mass. - Transient phase after the closure of the site, without the influence of the heat production due to the waste. This exercise allowed us to test the behaviour of the numerical model in situations characterized by a high heterogeneity, and to propose various improvements. New ways of visualizing the results (e.g. flow lines, residence, time maps) were developped.

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Bibliographic Reference: EUR 10509 FR (1986), VOL. I, 123 P., BFR 300, BLOW-UP COPY BFR 625, EUROFFICE, LUXEMBOURG, POB 1003
Availability: Can be ordered online
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