He describe the containment failure mode and release cc;egory assumptions used in the seismic risk study of the Zion jclear pouer plant, which was performed by the Seismic Safety. irgins Research Program (SSMRP). We then, for the dominant accident sequences, reassign containment failure modes and release categories based upon current thinking. We recalculate the seismic risk from the Zion facility using the new assumptions. Lastly, we discuss the impact of the new assumptions on the results and the relevance of the assumptions to value/impact analrses.

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