Tome Architecture and management of a geological repository - Andra

5 – B waste repository zoneFigure 5.6.8Temperature fields of primary packages of bituminised waste (B2.1) in the eventof a fire in the disposal cell 34The risk of direct combustion of the waste would appear to be ruled out in view of the protectionprovided by the concrete envelope of the disposal package. Likewise, spontaneous combustion of theembedding bitumen, which takes place at about 350°C, could not occur. These results lead us to ruleout the hypothesis of radioactive material release as a result of a fire on a handling vehicle.5.6.4.2 Consequences of a disposal package fallingThe drop scenario applied is based on the hypothesis that a disposal package tilts and turns over,followed by a 6-metre drop on to the rim of the lid (cf. Figure 5.6.9) for different types of B 35 wastepackages (B2, B5). This dropping configuration is more severe than "flat drop" or “edge drop"scenarios.The simulations set out firstly to estimate the mechanical consequences of the drop for the primarypackage before assessing its potential radiological consequences. Their results are due to be validatedby full-scale disposal package drop tests during 2005.Of all the drop scenarios examined, a B2 disposal package drop is the one that leads to the greatestdeformations for the primary packages contained, with deformation factor values that may peak at20% for the primary package closest to the point of impact (cf. Figure 5.6.10). The primary packagedeformation factors for B5 disposal packages are below 10%.3435The ignition source is placed laterally to the left of the packages and the concrete envelope of the disposal package is not illustrated.The B2 disposal package is a standard container in the simulations, while the B5 disposal package is a container with greater retentioncapacity (cf. section 5.3).Dossier 2005 Granite - ARCHITECTURE AND MANAGEMENT OF A GEOLOGICAL REPOSITORY149/228