Evaluation of geotechnical concepts to demonstrate long term safety of a salt repository in the decommissioning and post-decommissioning phase

The basic conditions to demonstrate the long term safety of a salt repository have been reviewed by the GRS in the frame of the project SR 2296. In particular, the comprehensiveness of the geotechnical safety analyses have been examinated. The measures to cope with the relevant geotechnical processes, which occur in the post decommissioning phase of a repository in salt rock, have been evaluated. German and US-requirements for decomissioning of repositories in salt rock have been listed and assessed with regard to compliance of geotechnical requirements. Recommendations on type and scope of geotechnical safety concepts for salt repositories have been formulated. (orig.)