Chemotoxic constituents in a repository for high-active waste

In a final disposal facility for highly radioactive and heat-generating radioactive wastes also chemically toxic constituents are included. These constituents are included in the disposed wastes, their package materials, the materials used to backfill shafts and mine openings and the infrastructural devices that remain in the mine. It has to be proved within the permitting process for a final disposal facility that these toxic constituents do not contaminate groundwater or cause a harmful change to its quality. In an associated research project Öko-Institut e.V., DBE TECHNOLOGY GmbH and GRS mbH devellopped a systematic algorithm for verifying the protection of groundwater against these toxic constituents. In a stepwise form it is shown for all credible future evolution of a repository in clay or salt how this proof can be performed. As far as quantitative analysis is required, the necessary tools are applied, their performance is evaluated and demonstrated in examples. Remaining unresolved issues are identified.