Leakage in coolant deuteration/deuteration system Preventive maintenance since July of last year... The Wolseong Nuclear Power Plant in Gyeongju, Gyeongbuk, in a state of standstill. Yonhap News An accident occurred in which heavy water leaked from Unit 4 of the Wolseong Nuclear Power Plant in Gyeongju, Gyeongbuk. The Nuclear Safety and Security Commission stated that there were no unusual issues related to external radiation. At approximately 2:26 p.m. on the 1st, the Nuclear Safety and Security Commission received a report from Korea Hydro & Nuclear Power that heavy water had leaked from the coolant deuteration and dehydration system of Wolseong Nuclear Power Plant Unit 4...