Architecture and management of a geological repository - Andra

2 – General DescriptionIn the repository zone for vitrified C waste (or spent fuel), a module consists of several dozen disposalcells. The cells are served by access drifts, oriented at right-angles to the cells. The space between thecells, essentially resulting from the consideration of thermal phenomena, is designed to ensureadequate heat dissipation.Figure 2.4.11C waste (or spent fuel) repository module2.5 The role of the various components of a repositoryThis section summarises the relationships between the components of a repository and the functionsdescribed in section 2.1, for the operation and observation of a repository, then in the long term.Through these functions, the needs fulfilled by each of the components or manufactured meansdescribed in chapters 4 to 10 are introduced. These needs will be detailed in the correspondingchapters.In addition to the waste disposal packages and major architectural components (repository modules,connecting drifts, shafts, multiple seals and surface installations), operational means used to constructnew modules, emplace the packages and manage the installations in a reversible manner are covered.2.5.1 Role of components for the reversible emplacement of waste packagesCertain components are justified solely by the industrial operations of waste package emplacement.For instance, surface installations and equipment used for the construction, operation and reversiblemanagement of the installations have no long-term safety function. Surface installations should bedismantled or reused for other purposes following closure, with the possible exception of the brokenrock disposal. The equipment used for the construction, operation and management of the installationswill be removed where necessary on closure, so as not to affect long-term safety.Similarly, the shafts and connecting drifts are only necessary for the construction and reversibleoperation of a repository. However, these components will remain after closure. If the decision istaken to close the repository, these shafts and drifts will be sealed and backfilled. Their design musttherefore take account of long-term safety functions, identified in the next paragraph.DOSSIER 2005 ARGILE -ARCHITECTURE AND MANAGEMENT OF A GEOLOGICAL DISPOSAL SYSTEM67/495