Indirect failure probability of Type 304 stainless steel piping

The NRC has developed criteria for establishing leak-before-break conditions in high energy piping. The Savannah River Plant production reactors operate at relatively low temperature and pressure, making them moderate energy systems. While these reactors are not under NRC jurisdiction, the NRC criteria of NUREG-1061 provide a useful and complete framework for demonstrating leak-before-break (LBB). These criteria include demonstrating a low failure probability of piping form indirect cause (resulting from the failure of surrounding equipment and structures). This paper presents an evaluation of the seismic indirect failure probability for the primary coolant piping at Savannah River Plant