UPDATE 1-South Korea approves restart of nuclear reactor; 6 still offline
* Restart due to begin on Thursday - official
* Still six offline, winter power shortage risk remains (Adds number still offline, detail)
SEOUL Dec 5 (Reuters) - South Korea's nuclear regulator approved on Thursday the restart of a reactor after a week-long shutdown due to technical glitch, though six out of the country's 23 reactors remain shut ahead of peak winter demand season.
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 the reactor's operator, Korea Hydro and Nuclear Power Co Ltd, 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 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 Dec. 12. (Reporting by Meeyoung Cho; Editing by Ed Davies)
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