Presentation #5 — Piping Base Case Evalution II By Dave Harris

Vugraph #3 is a summary of revised results since July 2003.

Could use VC Summer Hot Leg/RPV nozzle weld crack as benchmark, but need to be careful to consider all aspects such as differences in weld residual stresses due to repairs.

VG12 shows an order magnitude difference in LOCA frequency for a difference of 2 ksi (14 MPa) in normal operating stress; this was thought to be pretty sensitive result.

Dave assumed a linear residual stress field through the thickness due to the weld overlay repair.

The solid line in VG13 is PRAISE result while prior and post symbols come from Bengt’s results.