Tome Architecture and management of a geological repository - Andra

4 - General architecture of the repository in a granite medium• General organisation- The connecting drifts linking the shaft zone infrastructures with the various repository zones areorganised in clusters (or bundles) and enable exploration, construction, operation and possibleclosure activities to be carried out simultaneously in each repository zone. The number of driftsper cluster varies from five to three, depending on the distance from the shared infrastructures andthroughput convergence in this cluster. At the current stage of the studies, one drift is dedicated tothe movement of package transfer vehicles. Exhaust air also has its own dedicated drift. This drifthouses the smoke extraction ducts. When far from the shaft zone infrastructure, and wouldventilation requirements be minor, this drift is not anymore necessary and can be eliminated; thenexhaust air extraction is performed by the ducts installed in a construction drift. The other drifts(two to three drifts, depending on the distance from the zone served) are dedicated to constructionwork or repository module closure. In the portions with large throughput, construction drifts arepreferentially designed with one-way circulation along two tracks;- The secondary connecting drifts serve a set of two to four neighbouring modules within a singlerepository zone. They are in turn served by the main connecting infrastructure. The cluster ofsecondary connecting drifts comprises two to three drifts, whose specialised function lasts onlyduring the active performance period for this given activity (as construction, operation or closure).The drifts are re-equipped between each period and modified for the purposes of the followingactivity.Figure 4.2.6Diagram of the organisation and circulation in the connecting infrastructuresDossier 2005 Granite - ARCHITECTURE AND MANAGEMENT OF A GEOLOGICAL REPOSITORY69/228