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Final Disposal in Crystalline Rocks: Feasibility study for the development of a safety demonstration methodology (Project CHRISTA)

The aim of R&D project CHRISTA was to analyse whether the concept of final disposal in deep geologic formations with high containment capacity as stipulated in the Safety Re-quirements, which applies to salt and clay formations, can be transferred to crystalline rock. Furthermore, it was analysed to what extent the concept for final disposal in Scandinavian crystalline rock developed in Sweden and Finland, which is already ready for licensing, can be transferred to German settings. This so-called KBS-3 concept is mainly based on the con-tainment capacity of containers with copper shell. The results of the project show that if crystalline rock is to be considered as an option for repository siting while at the same time, the concept of a containment providing rock zone (CRZ) as stipulated in the German Safety Requirements is to be upheld, there are two prom-ising options. One is to find a crystalline formation that is covered with rock layers that have a high containment capacity (type "superposed CRZ"). The other is to find a crystalline for-mation that contains several smaller areas with high containment capacity (type "multiple CRZs"). The integrity criteria stipulated in the Safety Requirements can in principle be applied to both CRZ types. An assessment, which of these two possible options could be considered in Germany, can currently not be made as the necessary information about the geologic conditions is not yet available. The results of the project show that a direct transfer of the Swedish/Finnish KBS-3 concept to German conditions without further modification and adaptation is not possible. The final report of the project is available for download on our website in the media section under FuE-Berichte.

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