Tome Architecture and management of a geological repository - Andra

6 – C waste repository zoneFigure 6.6.8Closure of a handling drift• Closure of a repository moduleAs in the case of closure of a handling drift, the closure of the connecting drifts of a module comprisesremoving the equipment from the structure, scraping the concrete roadway and emplacing compactedlow permeability backfill. Seals incorporating a swelling clay core are built at the edge of the modulein each connecting drift (chapter 6.1.4). These seals are installed in the host block away from waterconductingfractures that define their limits.• Closure of a repository zone levelConnecting secondary and main infrastructure closure essentially consists of removing the equipmentand backfilling the drifts and constructing concrete plugs, which enables the process to be phased.To maintain an observed hydraulic compartmentalisation in the granite host massif, seals associatedwith low permeability backfill may be implemented.6.7 Functions of the repository components over timeThe previous sections have described the various components of a C waste repository. The followingtable summarises how these various components contribute to the main functions of a repository (cf.section 2.1) during its various phasesDossier 2005 granite - ARCHITECTURE AND MANAGEMENT OF A GEOLOGICAL REPOSITORY190/228