A study of adopting maintenance rule in the Korean NPP

In Korea, as risk informed applications and regulation become active, the necessity of Maintenance Rule (MR) has increased. Also, as Periodic Safety Assessment (PSR) and Reliability Centered Maintenance (RCM) are introduced, the MR should be integrated and coordinated with them. If PSR is already adopted, then it is not necessary to apply MR for the broader scope of SSC as currently adopted in USA. Instead, a stepwise approach would be more cost-effective for setting the MR scope SSCs. The first step would be to apply MR only for the SSCs whose risk related characters are changed by risk-informed applications. The relationships between RCM and MR, and between PSR and MR are discussed. An integrated plant maintenance model coordinating MR, RCM, PSR, and PM is introduced