Two nuclear reactors in South Korea were shut down after experiencing malfunctions, raising doubts over safety standards, AFP reports.

State-run Korea Hydro and Nuclear Power said two 1,000 megawatt reactors in separate plants malfunctioned and were shut down. No apparent danger of a radiation leak was detected from the “unrelated” incidents. The Shingori reactor was shut down for the first time after the reactor’s control rod broke down while a malfunctioning water pump was blamed for the shut down of the Yeonggwang reactor, a KHNP spokesman told AFP.

South Korea operates 23 nuclear power plants and generates more than 35% of the country’s electricity. The South Korean government said it would continue operations of nuclear reactors despite fears on nuclear safety in the wake of the Fukushima nuclear crisis in Japan.