Tome Architecture and management of a geological repository - Andra

6 – C waste repository zoneTable 6.7.1COMPONENTPart of the graniterock where a disposalcell is installedGranite "block"where the repositorymodule is installedThe repository hostpart of the granitemassifFunctions of the repository components over timesPERIODDuringoperation andreversiblerepositorymanagementAfter closureAfter closureAfter closureMAIN REPOSITORYFUNCTIONS1. GEOLOGICAL MEDIUM: GRANITEEmplacing (and being able toretrieve) the packages in thecellsProtecting the disposal cellsfrom water circulationDelaying and reducingradionuclides migration to theenvironmentDelaying and reducingradionuclides migration to theenvironmentProtecting the disposal cellsfrom water circulationIsolating the waste fromhuman activitiesProtecting the disposal cellsfrom water circulationDelaying and reducingradionuclides migration to theenvironmentPROPERTIES HARNESSEDMechanical strengthVery low permeabilityChemical properties of the granitewater that tend to delayradionuclide migration (reducingenvironment, etc.)Low permeability (at a distancefrom the significant waterconductingfractures)Low in-depth hydraulic gradientsChemical properties of the granitewater that tend to delayradionuclide migration (reducingenvironment, etc.)Underground installation of therepository (500 m taken asreference)Low permeability (at a distancefrom the major faults, the mainvectors of water in the massif)Low underground hydraulicgradientsChemical properties of the granitewater that tend to delayradionuclide migration (reducingenvironment, etc.)Geo-dynamic context that ensuresfavourable repository conditionsare maintained in the long term,particularly erosion phenomenaDossier 2005 granite - ARCHITECTURE AND MANAGEMENT OF A GEOLOGICAL REPOSITORY191/228