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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