Korea Hydro and Nuclear Power announced that Shin-Wolsong Unit 2, a PWR with 1000 MW capacity, stopped operating at 9.44pm on 6 September. This was the result of a main water supply pump stopping during a reactor test, causing a decrease in the steam generator water level.
The reactor had been put back into operation at 8.45am on 6 September, following a planned preventative maintenance. However, the pump stopped at an output level of 30 per cent, and the reactor had to be taken offline again while the cause of the pump’s failure was investigated.
Korea Hydro and Nuclear Power said in a statement: “The reactor is currently stable, and the environmental radiation of the stoppage is zero. Necessary measures will be taken based on the Nuclear Safety and Security Commission’s inspections.”