// Long-term Safety Studies, Site Investigation and Assessment

ANSICHT-II

Update of the safety and verification methodology for high-level radioactive waste disposal in claystone in Germany

In the context of the previous research project ANSICHT, a draft methodology for the safety-oriented assessment of repository systems in claystone formations in Germany was developed. To review and further develop the methodology, the Project Management Agency Karlsruhe (PTKA), on behalf of the Federal Ministry for Economic Affairs and Climate Action (BMWi, now BMWK), commissioned BGE TECHNOLOGY GmbH, the Federal Institute for Geosciences and Natural Resources (BGR), and the Gesellschaft für Anlagen- und Reaktorsicherheit (GRS) with the collaborative project ANSICHT-II. Taking into account the Endlagersicherheitsanforderungsverordnung (Repository Safety Requirements Regulation), individual assessments were developed and presented, thereby testing the nature of the safety assessment.

This synthesis report summarizes the results obtained on the approach to a safety-oriented assessment of a repository in a clay formation. Further details can be found in the individual reports focusing on:

Analyses on the integrity of the geological barrier (Maßmann et al. 2022),
Safety assessment of the technical and geotechnical barrier system (Wunderlich et al. 2022), and
Analyses on the radiological long-term statement (Rübel & Gehrke 2022).

Due to the generic nature of the ANSICHT-II project, no specific site investigations for a repository are included. Both the depicted geological overall situations and the rock and fluid properties used for numerical simulations are merely exemplary.