SCE&G's nuclear plant at Jenkinsville was taken offline Friday for a scheduled refueling outage.
The outage follows an 18-month operating cycle at the 966-megawatt V.C. Summer Nuclear Station, which began commercial operation in 1984.
The plant operated for a record 475 consecutive days, said Jeff Archie, senior vice president of SCE&G Nuclear Operations.
SCE&G said its other generating plants will provide power to its 654,000 electric customers during the shutdown, which usually lasts for about six to eight weeks.
During refueling every 18 months, about one-third of the reactor unit's 157 uranium fuel assemblies are replaced , the company said.
The refueling shutdown happened less than two weeks after the plant experienced an automatic shutdown caused by a faulty breaker on the non-nuclear side of the plant.
The breaker, which promoted the Oct. 2 shutdown, ties the plant to the power grid that delivers electricity to customers.
Repairs were completed and the plant resumed operation Oct. 12.
"Timing has been unique with this unanticipated maintenance outage happening so closely with our scheduled refueling outage," Archie said.