Tome Architecture and management of a geological repository - Andra

5 – B waste repository zoneThe application of light rock support (bolts and shotcrete) may be envisaged to ensure that safeconditions are provided on the construction site and for the operating activities.Filling the clearance space between the packages and the granite roof may require the installation ofsuitably shaped concrete elements.The slab is cut out with a slight slope towards the centre of the disposal tunnel to facilitate cleaningoperations prior to the construction of the final concrete slab.Lateral spacing between the columns of stacked packages is 10 cm. The clearance between cell wallsand packages is 10-20 cm. The space between each row of packages in the longitudinal plane isminimised.The assessed accumulated length of the disposal chambers produces the following data for each wastegrouping and per inventory model scenario:Linéaire de chambres de stockage- Déchets B non thermiques -B6.1; B6.2; B6.3; B6.5; B7.3; B8.3B3.3.2; B8.1; B4112120B3.1.1; B3.1.3; B3.2.2; B7.1B3.3.3; B6.45148B3.3.4; B8.2B3.1.2B2.1160141190276B2.2627B3.2.1610 100 200 300 400 500 600 700linéaire (m)Scénario S1 a Scénarios S1 b et c Scénario S2Figure 5.4.5Assessment of the length in metres of the disposal chambers for non-exothermicB waste5.4.2.3 Dimensioning and description of slightly-exothermic waste tunnelsIn the slightly exothermic B waste disposal tunnels (types B1 and B5), the packages must be arrangedso as is not to exceed the temperature criterion of 70°C in the concrete (cf. 5.2.2.3) in order to controlthe behaviour of the packaging concrete and radionuclides inside the cell.Dimensioning calculations [42] have been made to analyse the sensitivity of the potentialarrangements to the variability of thermal characteristics presented by French granites[7] (Table 5.4.1).Dossier 2005 Granite - ARCHITECTURE AND MANAGEMENT OF A GEOLOGICAL REPOSITORY133/228