Analysis of the Excavation Deviations Impact on Geological Radioactive Waste Repository Performance |
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| Authors: | Alain Genty Christophe Le Potier Stéphane Gounand |
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| Institution: | 1.Commissariat à l’énergie Atomique et aux énergies Alternatives,Gif sur Yvette Cedex,France |
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| Abstract: | Numerical simulations of the transport of radionuclide from high-level radioactive waste stored in geological repositories
often do not take into account construction defects in the repository. The potential impact of drilling and excavation deviation
from the engineer planned design is a priori considered negligible. We conducted computations on repository geometries that
contain deviations from horizontal of a few degrees. The analysis of the results shows that the impact of deviation defects
varies from 9 to 16%. A perfect control of the galleries and waste repository cell orientations is then of concern for radioactive
waste repository construction, failing which numerical simulations must be conducted on the worst geometric configuration
or margin errors added. On the other hand, if the orientation control is precise enough, a modification of the repository
design including controlled deviations from the horizontal may be of interest. |
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