TVA says an unusual event at the Watts Bar nuclear plant forced its evacuation this morning.
Spokesman Mike Bradley says an ammonia-water leak developed in a secondary water system at the turbine building at the plant.
That happened just before 9:00am.
Between two and three hundred employees were evacuated as a result.
The leak was fixed and the event was declared over just before 1:30pm this afternoon.
Bradley says the leak did not disrupt the reactor.
There were no injuries and there was no risk to the general public.