Architecture and management of a geological repository - Andra

6 – Overall underground architecture6.6.5 Sensitivity of the footprint of the repository to the pre-disposal storage duration.The footprint of the B waste and C0 waste repository zones does not depend on the pre-disposalstorage duration. For highly exothermal packages, the total footprint of the repository zones resultsfrom that of the repository modules, sensitive to the pre-disposal storage duration, and the distancesbetween these modules. The C waste repository zone for the scenario S1a has an footprint ofapproximately 500 hectares for a previous surface storage from 60 years (for the reference packagesC1/C2) to 70 years (for the reference packages C3/C4). Above a certain storage duration, thesensitivity of this footprint is attenuated: it becomes 300 hectares for a surface storage duration of150 years (Figure 6.6.5) and is reduced by half for a duration of 200 years. Under the assumption of arepository with spent fuels (scenario S2), a similar sensitivity is observed for the footprint to the predisposalsurface storage duration (Figure 6.6.6). This sensitivity varies with the speeds of thermaldecrease of the different types of packages.B zone100 haB zone100 haC0 zone 8 haC0 zone 8 haC zone500 haC zone300 haPre-disposal storage duration60 years for C1 and C2 wastes70 years for C3 and C4 wastesPre-disposal storage duration150 years for C wastesScenario S1aFigure 6.6.5Sensitivity of the footprint of a repository to the previous surface storageduration of highly exothermal packages - scenario S1aDOSSIER 2005 ARGILE -ARCHITECTURE AND MANAGEMENT OF A GEOLOGICAL DISPOSAL SYSTEM286/495