How can the performance assessment account for long time periods, such as one million years, the estimated peak dose timeframe?
The performance assessment is a systematic analysis that identifies the features, events, and processes (i.e., specific conditions or attributes of the geology, biosphere (including climate), degradation, deterioration, or alteration processes of engineered barriers, and interactions between the natural and engineered barriers) that may affect the performance of the disposal facility. The applicable features, events, and processes that need to be considered for evaluation depend on the time period of analysis. Different features, events and processes may need to be included for a performance assessment for 1,000; 10,000, and 1,000,000 years. As the period of analysis is extended through time, the uncertainty in the analysis grows. At longer time periods, analyses may need to rely on stylized scenarios, based on current scientific knowledge and assumptions about features, events and processes, such as major global climatic cycles including warming cycles and ice ages, rather than discre
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