Representation of aleatory uncertainty associated with the seismic ground motion scenario class in the 2008 performance assessment for the proposed high-level radioactive waste repository at Yucca Mountain, Nevada

•Results: Occurrence rates for waste package (WP) damage.•Results: Conditional distributions for peak ground velocity.•Results: Conditional distributions for damaged area on WPs.•Results: Distribution of rock fall volume.•Results: Probability of WP rupture.

The representation of aleatory uncertainty associated with the seismic ground motion scenario class in the 2008 performance assessment for the proposed high-level radioactive waste repository at Yucca Mountain, Nevada, is described. The following topics are considered: (i) occurrence rates for waste package (WP) damage, (ii) conditional distributions for peak ground velocity, (iii) conditional distributions for damaged area on WPs, (iv) distribution of rock fall volume, and (v) probability of WP rupture. Separate results are obtained for commercial spent nuclear fuel and codisposed spent nuclear fuel WPs.