Architecture and management of a geological repository - Andra

5 – Repository ModulesFigure 5.1.16B cell airlock5.1.3.3 Description of the access driftThe cell access drift is the area where the cell is to be sealed. Accordingly, the design of this drift isvery similar to that of a drift section to be sealed such as that described in Chapter 7 (section on“Closure of Underground Installations”). The only special feature of the access drift lies in adaptingits useful diameter to the size of the packages to be disposed of. The useful diameter is thus between5 and 6 m along the cells, according to the packages that will be placed in them.Figure 5.1.17Cross-section through the B cell and the access drift after sealing5.1.3.4 Thermal Behaviour of disposal cellsB waste is non- or only slightly exothermic. Some disposal packages (B5.1 and B5.2) have a lowresidual heat rating, of the order of 50 W for a disposal package containing four primary ten-year-oldpackages (cf. Figure 3.2.13, Chapter 3).DOSSIER 2005 ARGILE -ARCHITECTURE AND MANAGEMENT OF A GEOLOGICAL DISPOSAL SYSTEM176/495