According to an NRC report, a fire broke out Wednesday evening in the main condenser of the Entergy-owned Grand Gulf Nuclear Power Plant.
A fire brigade was dispatched and the area was quickly evacuated. The flames were put out in 40 minutes.
The unit has been planning a refueling outage since Feb. 20th.
Operators declared an "unusual event" after the fire was discovered early in the evening at the Mississippi plant. The cause of the fire is still under investigation.