"The shutdown of the Kori No. 1 reactor last Thursday was due to damage of a transformer cable connection", the Nuclear Safety and Security Commission said in a statement.
The regulator said that the reactor's operator, Korea Hydro and Nuclear Power Co Ltd (KRHYDR.UL) had replaced the cables at the 587-megawatt reactor, southeast of Seoul, and operations were due to resume on Thursday.
Asia's fourth-largest economy is striving to ensure stable power supply ahead of peak demand in January in the wake of cuts in nuclear power supply following a nuclear safety scandal.
Nuclear power accounts for about a third of South Korea's electrical supply. Three reactors have been shut since late May due to control cables supplied with fake safety certificates.
A fourth reactor is awaiting an extension of its licence after its 30-year life span expired in November of last year; a fifth is under extended maintenance through mid-January; and a sixth was shut on Wednesday for technical glitch. KHNP will shut a seventh for scheduled maintenance on December 12.
South Korea Uses Sniffer Dog To Search For Bedbugs After Paris Olympics South Korean YouTuber Makes Late-Term Abortion Video, Faces Police Probe North Korea Is Launching More Trash-Filled Balloons Southward: South Korea Who Is Jasveen Sangha, "Ketamine Queen" Charged With Matthew Perry's Death "Don't Expect Anything From Me": Kolkata Hospital's New Principal Loses Cool Nurse Raped, Killed On Way Home, Body Found 9 Days Later In UP CSAB 2024 Supernumerary Round Counselling Registration Begins Today Telangana Women's Commission Orders Probe Into KTR's Remarks What Is The Dinosaur-Killing Asteroid's Origin? Scientists Have An Answer Track Latest News Live on NDTV.com and get news updates from India and around the world.