A total of 208 kilograms of heavy water leaked from the Wolsong-4 reactor in Gyeongju. No radiation issues were detected.
Korea Hydro & Nuclear Power reported the incident to the Nuclear Safety and Security Commission at 2:26 p.m. on Wednesday.
The reactor has been shut down for regular inspection since July. The leaked water did not escape outside the facility.
Officials plan to send experts for an on-site inspection. No irregularities in external radiation levels were detected.
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Hanwha Aerospace has partially suspended operations at its Daejeon plant following a deadly explosion that killed five workers and injured two others.
Hong Kong authorities said an operational glitch at the Ling Ao Nuclear Power Station in Shenzhen last week posed no risk to public health or the environment. The event occurred during a scheduled refuelling overhaul and was rated Level 0 on the International Nuclear and Radiological Event Scale.
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Tokyo Electric Power Company Holdings Inc halted the release of treated radioactive water from the Fukushima Daiichi plant on Saturday after a low-flow alarm triggered an automatic shutdown.
South Korea postponed the planned launch of its Mir solid-fuel space rocket on Tuesday due to safety issues detected during final preparations, the defense ministry said.
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One turbine at reactor 4 of the Ringhals nuclear power plant has been taken out of service since Saturday evening. The reactor is now operating at half capacity, according to Vattenfall.