The Nuclear Safety and Security Commission said it completed its investigation into the research reactor "HANARO" at the Korea Atomic Energy Research Institute (KAERI) in Yuseong District, Daejeon, which automatically shut down on Oct. 28 last year, and approved its restart on the 26th.
According to the Nuclear Safety and Security Commission, the motor of the hydraulic pump that drives HANARO's shutdown rod overheated in October last year, stopping the pump, which caused one shutdown rod to drop and triggered an automatic shutdown.
The Korea Atomic Energy Research Institute (KAERI) replaced the hydraulic pump with new equipment, improved the cooling environment to prevent motor overheating, and established measures to strengthen monitoring of equipment temperature, among other steps to prevent recurrence.
The Nuclear Safety and Security Commission confirmed these measures were carried out appropriately and plans to continue checking the Korea Atomic Energy Research Institute (KAERI)'s implementation of its recurrence prevention measures after HANARO restarts.