Vogtle reports 'unusual event' after fire alarm sounds

A fire alarm at Plant Vogtle prompted Southern Nuclear to declare an “unusual event” Friday to the U.S. Nuclear Regulatory Commission, although inspectors quickly determined there was no fire.

The unusual event is the lowest of four nuclear plant emergency classifications used by federal regulators.

Company officials said the alarm activated in an auxiliary building access tunnel about 3 p.m. Friday, but responders who reached the area within five minutes found no evidence of a fire.

The cause of the alarm remains under investigation. Plant operations were not affected.