Tome Architecture and management of a geological repository - Andra
Tome Architecture and management of a geological repository - Andra
Tome Architecture and management of a geological repository - Andra
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7 - Spent fuel <strong>repository</strong> zoneCOMPONENTPERIODMAIN REPOSITORYFUNCTIONSPROPERTIES HARNESSEDConnecting driftsbetween accessstructures from thesurface <strong>and</strong><strong>repository</strong> modulesDrifts in the modules(cell access drifts <strong>and</strong>exploratorystructures)Backfill <strong>and</strong> seals <strong>of</strong>the disposal moduledriftsCell:disposal cavitySpent fuel:small verticalborreholeBefore <strong>and</strong>during<strong>repository</strong>operationDuring thereversibilityphaseBefore <strong>and</strong>during<strong>repository</strong>operationDuring thereversibilityphaseAfter closureDuringoperation<strong>and</strong> thereversibilityphaseAfter closure2. ENGINEERED COMPONENTSEmplacing (<strong>and</strong> being able toretrieve) the packages in thegraniteEmplacing (<strong>and</strong> being able toretrieve) the packages in thegraniteProtecting the disposalmodules from watercirculationDelaying <strong>and</strong> reducingradionuclides migration to theenvironmentEmplacing (<strong>and</strong> being able toretrieve) the packages in thegraniteRestricting radionuclidesrelease by primary packages<strong>and</strong> immobilising themDimensions adjusted to packagethroughputDrift equipment that ensures safeoperationSuitable dimensions for packagethroughputDrift equipment that ensures safeoperationLow permeabilitySwelling capacityRadionuclide retentionDimensions adapted to the granitefracturing <strong>and</strong> h<strong>and</strong>ling technologiesProperties <strong>of</strong> the variouscomponents: packages, engineeredbarriers, backfillSpent fuel containersin copperDuringoperation<strong>and</strong> thereversibilityphaseAfter closureEmplacing (<strong>and</strong> being able toretrieve) the packages in thegranite (with sleeve <strong>and</strong>operating plug)Preventing radionuclidesrelease by fuel assemblies <strong>and</strong>immobilising the radionuclidesMechanical strengthSuitable dimensions for h<strong>and</strong>lingthemWater-tightness <strong>of</strong> the canisters (overseveral hundreds <strong>of</strong> millennia)Low permeabilityClay engineeredbarriers <strong>of</strong> the spentfuel <strong>repository</strong>boreholesAfter closureProtecting the disposal cellsfrom convective watercirculationDelaying <strong>and</strong> reducingradionuclides migration to theenvironmentSwelling capacity <strong>and</strong> plasticity(providing the long-term mechanicalstability <strong>of</strong> the cell)Chemical buffer to interactionsbetween the granite water <strong>and</strong> thecomponent alteration productsRadionuclides retentionDossier 2005 granite - ARCHITECTURE AND MANAGEMENT OF A GEOLOGICAL REPOSITORY219/228
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