DEVENIR A LONG TERME DES STOCKAGES DE DECHETS RADIOACTIFS EN FORMATION GEOLOGIQUE - ANALOGIE AVEC L'ALTERATION DES GISEMENTS MINERAUX
This document is the final report of the program "Long-term evolution of radio-active waste storage in geological formations: analogy with the weathering of mineral deposits", which was the subject of a contract (no 357.83.7) at shared cost, between the BRGM and the EEC concerning the MIRAGE project. In theory, the storage of radioactive waste in geological formations can be compared to natural "storage" of mineral substances such as mineral deposits, in the geosphere. The aim of this study was to select examples of mineral deposits and their weathering environment, showing the long-term behaviour, in geological time, measuring (area, volume) some constituent elements of radioactive waste storage subject to the hazards of hydrogeochemical weathering. Initially, a feasibility study was made to collate data available within the BRGM (mining group and public service) and from literature dealing with weathering of deposits. It was thus descovered that the analogy between radioactive waste storage and mineral deposits could be approached in two different yet complementary ways: - One approach is to observe the behaviour of a mineral deposit in relation to the country rocks. For this a bibliographic metallogenic study was made which is given in chapter 2. - The other approach is to observe the behaviour of chemical elements during deposition of a mineral deposit whose genesis is similar to the spatial and thermal environment of a deposit of radio-active waste in a geological formation. For this two sites were selected corresponding to hydrothermal systems showing strong analogies to those expected in the neighbourhood of the storage sites. These two sites, Langenberg in the Vosges and La Telhaie in Brittany, were the subject of complementary analytical work which is given in chapter 3.
Bibliographic Reference: EUR 10839 FR (1987) MF, 306 P., BFR 600, BLOW-UP COPY BFR 1580, EUROFFICE, LUXEMBOURG, POB 1003
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Record Number: 1989126031401 / Last updated on: 1989-01-01
Available languages: fr