1887

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.

English

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Repository Siting and Design and the Levels of Protection Required in Regulation

Nuclear Energy Agency

The safety of geological repositories, and in particular the possibility to show that adequate levels of isolation and containment are provided over the timeframes addressed by safety cases, requires that these systems are robust with respect to the perturbing phenomena and uncertainties that may arise over these time frames. Thus, as far as reasonably possible, events and processes that could be detrimental to isolation and containment, as well as sources of uncertainty that would hamper the evaluation of how the systems evolve over time, are avoided or reduced in magnitude, likelihood or impact. 

English

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