ATHENS, AL. (Times Free Press) -- TVA has garnered another safety flag from the Nuclear Regulatory Agency -- the fourth in just over a year.

The newest -- a "white" finding -- comes at Browns Ferry Nuclear Plant near Athens, Ala., which already has been under a "red" safety finding since May 2011.

An NRC letter to TVA dated June 22 says the reactor operators at Browns Ferry do not understand and know how to implement 5-month-old NRC and TVA procedures for responding to a plant fire.

And their TVA trainers didn't know how, either. "Other staff members, including those responsible for training and oversight of operators, also displayed a lack of knowledge," states the letter from NRC's Richard Croteau, director of the division of reactor projects. The trainers "were providing negative training to operators," the letter states.

Read more on the story from our news partners at the Chattanooga Times Free Press.