Core Viewpoint - A heavy water leak incident occurred at the Wolseong Nuclear Power Plant in South Korea, with approximately 265 kilograms of heavy water leaked, but no radiation anomalies were detected [1]. Group 1: Incident Details - The leak was reported on the 19th of the month at the No. 2 unit of the Wolseong Nuclear Power Plant located in Gyeongju, North Gyeongsang Province [1]. - The leak was contained within the facility, and the surrounding radiation levels were reported as normal [1]. - The incident took place during a routine maintenance shutdown of the unit, and the operator, Korea Hydro & Nuclear Power, immediately shut down the relevant nuclear pump upon detection of the leak [1]. Group 2: Previous Incidents - This is the second leak incident reported at the Wolseong Nuclear Power Plant in 2023, with the first incident occurring on January 12, when approximately 29 tons of untested nuclear waste liquid were discharged into the sea [1].