BRACEVILLE, Ill. - Operators at the Braidwood Generating Station declared and terminated an unusual event this morning when power to a plant control room alarm system was temporarily interrupted. The Unusual Event was declared at 10:18 a.m. and terminated at 10:47 a.m.
The Nuclear Regulatory Commission (NRC) policies require a station to declare an Unusual Event when there is an interruption to this system for greater than 15 minutes.
Plant operators are investigating the cause of power interruption to the alarm system.
Both Braidwood units continued to operate at full power during the event. Plant instrumentation for control room operator monitoring was always available to plant personnel. There was no impact to plant safety or security.
Exelon Nuclear personnel notified all appropriate federal, state and local government officials of the Unusual Event, the lowest of four emergency classifications as defined by the Nuclear Regulatory Commission.
Braidwood Generating Station is approximately 60 miles southwest of Chicago. The station's two nuclear energy units can produce a total of more than 2,300 megawatts net at full power - enough electricity to power more than 2 million homes.