PSA Lessons Learned from Maintenance Rule

According to the recommendation for introducing the Maintenance Rule (MR) to nuclear power plants from Nuclear Safety Committee in December 2002, KHNP and KEPRI are developing maintenance rule implementation program for pilot plant, Ulchin 3 and 4, planned to complete at September 2006. In the process for establishment of Maintenance Rule program, the risk information from Probabilistic Safety Assessment (PSA) is an important roles in determination of risk significance and performance criteria. On the other hand, MR program gives the chance to review the PSA model more realistically. That is to say, MR program and PSA are cooperative program each other. PSA information makes MR to be risk-informed and MR program makes the PSA more realistic. In this study, the roles of PSA in MR implementation were investigated and PSA issues found during establishment of MR program were discussed