Architecture and management of a geological repository - Andra

4 – Waste disposal PackagesFigure 4.3.9Placement in cell of a large diameter package using an air cushionThis procedure does not require any special technical measures for disposal packages.However, for small diameter disposal packages (CU2 and CU3), the principle of disposal cell transferadopted is similar to that of C waste packages (with nearly the same diameter), namely slidingpackages in the cell sleeve using a pusher robot.In the same way as for C packages, the sliding movement is carried out through ceramic sliding runnerfriction on the metal sleeve.• Taking into account on eventual retrievalIn the same way as for C waste packages, maximum load applicable to the handling groove wasdetermined for removal of packages from disposal cells, taking into account corrosion thickness (2 m).The calculation provides a maximum applicable load, corresponding to the yield strength limit ofabout 800 kN for large diameter packages and 500 kN for small diameter packages. Rupture stresscorresponds to a traction load of twice that amount.4.3.4 Disposal package manufacture techniqueThis section presents disposal package manufacture techniques for spent fuel of CU1 and CU2 types 54These techniques have been full size tested within the framework of demonstrators 55 . Thesecorrespond to disposal packages containing 4 assemblies of UOX 1 300 MWe type in its twomanagement variants (bare assemblies and assemblies in cladding) as presented in Figure 4.3.10.5455For SF3 type fuel, the topic is covered in section 4.2.4This programme was implemented in 2004 and 2005 together with the CEA and EDFDOSSIER 2005 ARGILE -ARCHITECTURE AND MANAGEMENT OF A GEOLOGICAL DISPOSAL SYSTEM153/495