Project Opalinus Clay (Entsorgungsnachweis) - Illustrating the Safety and Robustness of the Proposed Disposal System for
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3URMHFW2SDOLQXV&OD\ (QWVRUJXQJVQDFKZHLV ,OOXVWUDWLQJWKH6DIHW\DQG5REXVWQHVVRI WKH3URSRVHG'LVSRVDO6\VWHPIRU6)+/:DQG/RQJOLYHG,/: L.H. Johnson1, J.W. Schneider1 and Piet Zuidema1, P. Gribi2 , G. Mayer3, P.A. Smith4 1 Nagra, Switzerland 2 Vibro-Consult AG, Switzerland 3 Colenco Power Engineering AG, Switzerland 4 Safety Assessment Management Ltd., UK $%675$&7 Nagra (the Swiss National Cooperative for the Disposal of Radioactive Waste) has completed a study to determine the suitability of Opalinus Clay as a host rock for a repository for spent fuel (SF), high-level waste from reprocessing (HLW) and long-lived intermediate-level waste (ILW). The proposed siting area is in the Zürcher Weinland region of Northern Switzerland. A repository at this site is shown to provide sufficient safety for a spectrum of assessment cases that is broad enough to cover all reasonable possibilities for the evolution of the system. Furthermore, the system is robust; i.e. remaining uncertainties do not put safety in question. ,1752'8&7,21 Nagra has been developing the concept of a repository for spent fuel (SF), high-level waste from reprocessing (HLW) and long-lived intermediate-level waste (ILW) in the Opalinus Clay for over ten years. A fully integrated study incorporating three main aspects (i) geological understanding [1], (ii) repository design [2] and (iii) long-term safety assessment [3], has now been completed. The study provides a demonstration of siting feasibility for the selected host rock in the region of the Zürcher Weinland, where detailed site investigations have been performed. Additional research on the Opalinus Clay has been performed at the Mont Terri Underground Laboratory. The results of calculations of radiological consequences, which constitute one of several lines of argument making up the safety case for the selected disposal system, indicate that disposal is feasible from a safety point of view. In particular, the results demonstrate sufficient safety to satisfy regulatory criteria for all reasonably conceivable possibilities for the evolution of the disposal system. 7+(',6326$/6
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