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. The on-going research project „Identification and evaluation of processes that can arise by disposing of both high level radioactive waste (HAW) and low to intermediate level radioactive waste (LAW/MAW) at the same site“ (GemEnd, FKZ 4719F10401), commissioned by theFederal Office for the Safety of Nuclear Waste Management (BASE), isconcerned with the question which thermal, hydraulic, mechanical, chemicaland biological (THMCB) processes could be of importance for the long-termsafety of the geological repository for high level radioactive waste. The focus of the project is on mutual influences between the HAW and LAW/MAW repositories, which should be constructed separately according to the Safety Regulations (Federal Ministry for the Environment, Nature Conservation and Nuclear Safety, BMU, 2020). A second point of emphasis is on processes that could result from the disposal of small amounts of LAW/MAW within the HAW repository. The analyses carried out for each of the potential host rocks clay rock,rock salt and crystalline rock as well as for a combination of clay rockabove crystalline rock at a generic site are divided into a qualitative anda quantitative part. As for the qualitative analyses, all potentiallyrelevant processes are identified and evaluated as to whether they arenegligible or principally relevant for the exemplary repositoryconfigurations considered and according to the current state of knowledge. With regard to the quantitative analyses, the possible extent of potentially safety-relevant processes is illustrated by means of coupled numerical simulations. Of special interest are the effects of particularly sensitive model approaches and/or parameters and notably of the distances between the HAW and LAW/MAW repositories in the different exemplary repository configurations considered. From the results of the quantitative and qualitative analyses, knowledgegaps will be identified and the possibility of their reduction by researchand development activities will be discussed. Furthermore, aspects of thetransferability of the results to the German site selection procedure willbe illuminated. At the interdisciplinary research symposium safeND selected preliminaryresults of both the qualitative and quantitative analyses will be presented.

Identification and evaluation of processes for joint disposal of high level radioactive waste and low to intermediate level radioactive waste