Architecture and management of a geological repository - Andra

3 – High Level Long-Lived WasteThe conditioning hypothesis considered in the study 19 is compaction of the waste placed in holders 20 ,then transfer to small sizes stainless steel containers known as "Standard Compacted WasteContainers" (CSD-C) (see Figure 3.2.2).Figure 3.2.2Standard compacted waste containers (CSD-C)The conditioning hypothesis assumes a weight of 400 kilograms of waste per package, made up of amixture of different types of activated waste in the following proportions: 5% neutronic poison rods,78% control rods and 17% various metal wastes. The weight of the finished package is around510 kilograms.It should be noted that these pakages contain no organic materials and are not liable to produce gas(hydrogen) by radiolysis.3.2.1.2 Bituminised liquid effluent treatment sludgesThe second group of B wastes comes from radioactive liquid effluents resulting from the operation offuel reprocessing facilities. The effluents considered here are generated at various stages of fuelreprocessing and during work carried out on equipment and facilities (decontamination, flushing).These effluents are collected in treatment stations where they are decontaminated by chemicalprocesses before discharge. The residual waste is then recovered in the form of sludges.In the STEL effluent treatment station at Marcoule and STE3 at La Hague, opened in 1966 and 1989respectively, this sludge has been conditioned by embedding in bitumen, which is then put in carbonsteel drums. On the other hand, sludges from effluents produced and chemically treated at La HagueSTE2 (Effluent Treatment Station No. 2) from 1966 to 1990 have been gradually stored in tanks andsilos at the plant, awaiting conditioning. The planned conditioning method for these sludges is alsoembedding in a bitumen matrix.1920An alternative conditioning mode, not dealt with here, is being studied at EDFLarge rods and CIS thimbles are cut into sections before being placed in compaction holdersDOSSIER 2005 ARGILE -ARCHITECTURE AND MANAGEMENT OF A GEOLOGICAL DISPOSAL SYSTEM78/495