Calculated Hydrogeologic Pressures and Temperatures Resulting from Radioactive Waste in the Eleana Argillite
The SHAFT 78 code (multi-dimensional, two fluid phases, porous medium) has been used to begin assessment of the consequences of nuclear waste burial in a 1000 acre repository emplaced in argillite. The repository is assumed to contain spent fuel [SF (UO2)] at a loading of 150 kW/acre and to be located at a depth of 600 m. It was found that with perfect backfill, permeability = 1.0×10−7 darcys, a maximum fluid pressure in the repository of 770 bars existed at a time of 55 years after burial. Holding all other input variables constant, the maximum fluid pressure in the underground workings never exceeded the local lithostatic pressure when the permeability of the backfill material was increased to 1.0×10−1 darcys. The calculated temperature profiles are essentially independent of backfill permeability and porosity indicating that the heat flow is conduction dominated.
KeywordsClay Permeability Porosity Shale Assure
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