May 19, 2010
Quad Cities Operators Declare, Terminate Unusual Event
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.
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.
Exelon Corporation is one of the nation’s largest electric utilities with approximately $17 billion in annual revenues. The company has one of the industry’s largest portfolios of electricity generation capacity, with a nationwide reach and strong positions in the Midwest and Mid-Atlantic. Exelon distributes electricity to approximately 5.4 million customers in northern Illinois and southeastern Pennsylvania and natural gas to approximately 486,000 customers in the Philadelphia area. Exelon is headquartered in Chicago and trades on the NYSE under the ticker EXC.