Abstract
In risk analysis of power reactors the leakage or failure of piping structures has to be taken into account as a possible cause of loss of coolant. As part of the SMiRT post conference seminar on “PRA of NPP for External Events” the present practice of selecting pipe failure rates as initiating or related events for PRA's has been discussed. For pipe failures as initiating events an approach has been developed in the framework of the risk study for German PWR's. As compared to NUREG-1150 some significant differences are identified. For external events the effect of seismic induced loads on pipe failure has been a subject of considerable efforts in research. Several studies have demonstrated that for moderate siting conditions the effect of seismic induced loads on pipe failure rates of large diameter high pressure piping does not lead to significant contributions to the overall risk. The main subject for future research on pipe failure mechanisms is the detailed assessment of the influence of the water chemistry conditions.
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