Study on maintenance rule scoping method using classified quality class if SSCs in domestic NPPs

Maintenance Rule(MR), which was effective July 1996 in U.S.A, was officially adopted in all of the U.S.A nuclear power plants. In Korea, progress in reliability centered maintenance (RCM) analysis for optimizing the maintenance program. Maintenance rule is a tool for monitoring the effectiveness of maintenance at nuclear power plants. RCM is a tool for optimizing the existing preventive maintenance program. For RCM analysis, we should select critical components that are functional important. For implementation of MR, we should select the structures, systems, and components(SSCs) within the scope of MR. In this paper, reviewed relationship between RCM and MR and proposed maintenance rule scoping method using quality classification of SSCs in domestic nuclear power plants that is used in RCM analysis for Yonggwang units 1 and 2