BURLINGTON, Kan. (AP) — Authorities say an eastern Kansas nuclear power plant has reopened after a fire.

A Wolf Creek Nuclear Operating Corporation spokesman says the fire broke out Monday in one of two emergency diesel generator rooms. Employees extinguished the flames before the Coffey County Fire Department arrived. The plant was evacuated for about two hours.

It’s unclear what started the fire or what was damaged.

The spokesman says no injuries were reported and no radiation was released. He says federal law requires that the generator is operational within 72 hours or the plant will have to be taken offline.