[D]ocuments the [Tennessee Valley Authority] is required to submit to the Nuclear Regulatory Commission show reactor operators became distracted while manually operating cooling water flow to the Unit 1 reactor and water began boiling off faster than it was being replaced. [...]

Browns Ferry ran on diesel generators’ power for five days after the shutdown. [...]

When one of the generators failed at Browns Ferry, there was a temporary loss of shutdown cooling for one reactor for about 47 minutes, but the water level in the reactor never got near the boiling point, officials said. [...]

The water in the reactor boiled low enough to trigger another shutdown alarm in the control room, but [TVA nuclear spokesman Ray Golden] said boiling water still covered the reactor fuel.

[link to timesfreepress.com]