South Korea's Wolsong No.1 nuclear power reactor shut down on Friday after its safety system detected a technical problem, the country's nuclear reactor operator said. That puts the number of South Korean reactors offline at five out of a total of 25, including the Shin Kori No.3 reactor, which is in a test run, a spokeswoman at the Korea Hydro and Nuclear Power Co Ltd (KHNP) said, Reuters reported. "We are looking into the exact cause of the shutdown," the spokeswoman said, adding it was not clear when the 679-megawatt Wolsong No.1 reactor would be restarted. An official at power market operator Korea Power Exchange said the shutdown of the Wolsong No.1 reactor would not have an impact on the country's power supply. Nuclear power provides about a third of South Korea's electricity. The KHNP spokeswoman said there has been no radiation leak at Wolsong and the reactor's power generating station is in a stable condition. The Wolsong reactor is located in the city of Gyeongju, over 300 kilometers, southeast of the capital, Seoul.
