Long-term Safety of Final Repositories: Experiences concerning the Rôle of Uncertainty and Risk in Assessments and Regulations
The concept of disposal of long-lived radioactive waste in deep geological repositories is an essentially passive and permanent management option which has the potential to isolate the waste for extremely long periods of time. Decisions to be made during repository development need to be supported by a post-closure Safety Case (a synthesis of evidence, analyses and arguments that quantify and substantiate a claim that the repository will be safe after closure). In the frame of Safety Assessments, which stand at the core of the Safety Case, potential long-term evolutions of the repository system called scenarios are constructed. For these scenarios, the behaviour of the system components (engineered, geotechnical and natural barriers) are described using model calculations with regard to the potential migration of radionuclides and to hazards for man or the environment.
KeywordsRadioactive Waste Safety Assessment Safety Criterion Scenario Uncertainty Deep Geological Repository
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