The unit was shut down on 22 August due to a problem with its feedwater pumps.
Entergy spokesperson Carol Wightman said the source of fault was identified by technicians who replaced a breaker and corrected a ground fault linked with the feedwater cooling system.
"We also took advantage of the plant being offline to perform other maintenance that cannot be done while the plant is operating," Wightman added.
The US Nuclear Regulatory Commission said that there was no threat to public safety during the plant’s shut down.
Entergy said backup pumps were automatically activated and plant systems performed as designed.
