Architecture and management of a geological repository - Andra

11 – Operational SafetyTable 11.5.3Temperatures estimated at the transfer transfer cask, the disposal package andthe primary package C obtained by digital simulations under fire conditionsMaximumtemperaturereached (°C)Time to reach Tmax fromthe outbreak of the fireExternal surface 1410 ~ 1 hTransfer transferPlaster polyethylene boron 1347 ~ 1 hcaskInternal surface 71 ~ 4 hDisposal package According to the surface 70 ~ 23 hPrimary packageContainer body 71 to 83 from 23 h to 27 hWastes 92 ~ 30 hConsidering the fire’s temperatures, the transfer cask may be affected by steel creep phenomena andPPB adhesion defects. This would necessitate checking the radiological protection level beforeperforming any transfer cask recovery operation.11.5.1.5 Results related to a fire on the transfer transfer cask, the disposal package and theassemblies of spent fuels (CU1)The results related to the fire on a vehicle transporting a transfer cask of spent fuel lead to the samecomments as in the case of C waste packages.The thermal stresses would not induce any mechanical consequences on the spent fuel assemblies.There would not be any risk of damage because they would only be subject to a rise of about15 degrees with respect to their initial temperature.As previously, the results obtained refute the assumption of a deterioration of the spent fuel packagesprovoking radiological consequences.Table 11.5.4Transfer transfercaskDisposal packageAssembly of spentfuelsTemperatures estimated at the tranfer transfer cask, the disposal package andthe spent fuel (CU1) obtained by numerical simulations under fire conditionsMaximumtemperaturereached (°C)Time to reach Tmax fromthe outbreak of the fireExternal surface 1280 ~ 1 hPlaster polyethylene boron 1250 ~1 hInternal surface 271 ~2 hContainer 98 ~4 hInsert 69 ~8 hCladding 67 ~9 hAssembly centre 100 -DOSSIER 2005 ARGILE -ARCHITECTURE AND MANAGEMENT OF A GEOLOGICAL DISPOSAL SYSTEM468/495