Development of Waste Package Evolution Scenarios

Quintessa has assisted Nirex in developing waste package evolution scenarios for the geological disposal of low-level and intermediate-level wastes, as input to investigating the importance of time-dependency and heterogeneity effects on post-closure repository performance.

In addition to a base scenario, seven variant scenario classes have been defined representing combinations of enhanced water flux, altered water chemistry and physical disruption, and scenarios were presented as combined storyboards and timelines.