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Considering Timescales in the Post-closure Safety of Geological Disposal of Radioactive Waste

image of Considering Timescales in the Post-closure Safety of Geological Disposal of Radioactive Waste

A key challenge in the development of safety cases for the deep geological disposal of radioactive waste is handling the long time frame over which the radioactive waste remains hazardous. The intrinsic hazard of the waste decreases with time, but some hazard remains for extremely long periods. This report reviews the current status and ongoing discussions of this issue, addressing such issues as ethical principles, the evolution of the hazard over time, uncertainties in the evolution of the disposal system (and how these uncertainties themselves evolve), the stability and predictability of the geological environment, repository planning and implementation including regulatory requirements, siting decisions, repository design, the development and presentation of safety cases and the planning of pre- and post-closure institutional controls such as monitoring requirements.

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Developing and Presenting a Safety Case

Nuclear Energy Agency

Events and processes varying widely in their rates, timing, likelihood of occurrence and impact affect the evolution of a repository and its environment. The identification of relevant events and processes is generally regarded as tasks for the implementer, although regulators may specify certain, sometimes site- or concept-specific events and processes that should, as a minimum, be considered for inclusion in a safety case, based on their own understanding and possibly as a result of dialogue with implementers (Appendix 4, observations from responses to Question 6.2a).

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