MARSEILLES —Exelon Generation’s La Salle County Generating Station declared an Unusual Event at 3:11 p.m. today, after both units automatically shut down when power from the switchyard into the site was interrupted during a severe thunderstorm.
The plant responded as expected, safely and without incident. The station’s multiple layers of safety and protection systems are designed to ensure safe shutdown of the plant in cases of electrical disturbances.
Technical experts are working to restore power to the switchyard. The switchyard is a large substation that carries electricity to and from the plant. When power from it was interrupted, the station’s locomotive-sized backup diesel generators immediately started up and continue to provide electricity to the site.
The shutdown will not impact electrical service to consumers, as other power plants in the area can provide enough electricity to meet the area’s needs.
An Unusual Event is the lowest of four emergency classifications established by the U.S. Nuclear Regulatory Commission.
LaSalle Generating Station is located about 75 miles southwest of Chicago near Marseilles, Ill. At full power, the facility’s two generating units produce more than 2,200 megawatts around the clock, enough electricity for 2.3 million typical homes.