CORDOVA, Ill. - Quad Cities Generating Station today declared, then terminated an "unusual event" about an hour later after personnel in the station's access facility identified a freon leak coming from the facility's ventilation system.
The leak was caused when a valve on the building's air conditioning unit malfunctioned. The leak has been stopped, there was no impact to employees, and repair plans will be put in place. Freon is a compound commonly used as a refrigerant.
The station's main access facility, which is located a few hundred feet from the plant, is where employees enter and leave the site. Station security personnel took precautionary measures and closed the affected building during the event. The main access facility has since been reopened. The safety and security of the plant was never compromised.
The emergency classification is the lowest of four under Nuclear Regulatory Commission regulations.
Operators declared the unusual event at 1:30 p.m. CT, in accordance with station procedures, which require the declaration when a gas has the potential to impact personnel or operations. The unusual event terminated at 2:38 p.m. CT.
Both units continued to operate normally during the event.
Exelon Nuclear notified all appropriate federal, state and local government officials of the event. Quad Cities has two boiling water reactors, which jointly produce 1,793 net megawatts.