Tome Architecture and management of a geological repository - Andra

5 – B waste repository zoneDesign measures have been retained to ensure that the body-lid coupling is good: limiting the cast liddiameter, reducing shrinkage that might generate microfissuring, circular shape to avoid singularzones, interface profile chosen on the basis of feedback on existing disposal packages (low- andintermediate-level waste packages disposed of at the CSFMA Centre).A testing programme is currently being run to check that this coupling is not a weak zone.This container is illustrated below (Figure 5.3.2). Its dimensions are roughly 1.50 metres wide andlong by 2 metres high. Its total mass (full container) is about 12 tonnes.Figure 5.3.2Example of a disposal package with reinforced retention capacityOther design options may be envisaged to obtain the performance levels sought for durableconfinement. By way of illustration, the Japanese agency RWMC has examined a solution in whichthe primary packages are embedded in a “single-cast” monolithic concrete matrix and then hassuccessfully carried out with a ¼-scale demonstrator. The concrete used is Ductal® high-performance,fibre-reinforced concrete.Dossier 2005 Granite - ARCHITECTURE AND MANAGEMENT OF A GEOLOGICAL REPOSITORY123/228