Architecture and management of a geological repository - Andra

2 – General DescriptionTable 2.5.2Long-term safety functions and repository componentsMain manufactured componentsFunctionsProtect man and the environment against the dissemination ofradioactive substancesby taking account of probable natural events and hypotheticalsituations,by protecting the environment from other impacts (chemical)PeriodDisposal packagesRepository modulesShafts and connectingdriftsCell sealsShaft and connecting driftsealsBackfillSurface installationsConstruction, operation,management equipmentGeological mediumPrimary packagesIsolate waste from surface erosion phenomena and ordinary humanactivitiesOppose water circulationLimit water flows and circulation velocityLimit the release of toxic elements and immobilise them in therepositoryB wasteProtect metallic waste from corrosionC waste(vitrified)Spent fuelProtect embedding bitumen (bituminised waste):temperature, deformation, pHPrevent inflow of water onto glass duringthermal periodLimit aqueous alteration of glass, transport ofdissolved species to vicinity, pHPrevent inflow of water onto assembliesLimit aqueous alteration of ceramic, transport ofdissolved species to vicinityLimit the dissolution of toxic elements, ensure reducing chemicalconditionsFilter the colloidsDelay and attenuate the migration of toxic elements to theenvironmentMonitor migration by diffusion, retention and dispersion into thehost formationDelay the migration of toxic elements into the engineeredcomponentsPreserve the capacity of natural dispersion into surroundinggeological formationsAfterclosureAfterclosureAllThermalperiodAfterclosureThermalperiodAfterclosureAfterclosureAllAfterclosureXXX♦♦♦♦Preserve the beneficial properties of the geological mediumLimit mechanical deformation in the Callovo-Oxfordian argillitesXDissipate heat (essentially vitrified C waste and spent fuel)Protect disposal modules from chemical disturbance caused by thealteration of certain packagesRemain sub-critical (spent fuel, vitrified C waste type C4, B wastetypes B3/4/5)AllSeparate the repository modulesKey:Contribution of a manufactured component to a function♦Function harnessing a beneficial property of the geologicalmediumXMain function of a componentFunctionwhere the study takes account of the characteristics ofthe geological medium or the primary packagesDOSSIER 2005 ARGILE -ARCHITECTURE AND MANAGEMENT OF A GEOLOGICAL DISPOSAL SYSTEM71/495