Kori 1 SBO and maintenance rule in Korea

On February 9, 2012, during the 29th refueling outage of Kori 1 nuclear power plant, a station blackout (SBO) occurred and the event was not reported for a long time. By reviewing the Kori 1 SBO event, we are trying to find a necessary system or process to prevent the similar event in this paper. One of reason of the SBO event is the lack of a configuration control including a safer outage work scheduling. It is discussed here why the configuration control is not working even though it is known that the maintenance rule (MRule) is adopted in KHNP. After the SBO event, two main actions were taken by KHNP and NSSC(Nuclear Safety and Security Commission); 1) extended overhaul period and 2) evaluation of outage work schedule by regulatory body. It is also discussed in this paper how these two actions can be performed