October 14, 2010
Dresden Unit 3 Returns to Service
Unit back in service after short outage
MORRIS, Ill. (Oct. 14, 2010) –Dresden Station Unit 3 returned to service at 2:19 a.m. Thursday, Oct. 14, when operators connected the plant’s generator to the regional power grid.
The unit automatically shut down Monday morning, Oct. 11, due to a failure of an instrument power supply during scheduled testing activities.
“Nuclear power plants are designed so that a reactor can safely shut itself down automatically when the system detects an anomaly, which is what occurred Monday,” said Tim Hanley, Dresden site vice president. “Our plant responded as expected with no safety concerns or other issues.”
Workers at the plant replaced the faulty power supply prior to restarting the unit.
The shutdown did not impact electrical service to Exelon customers.
Dresden Generating Station is approximately 60 miles southwest of Chicago. The station’s two operating units can produce more than 1,700 megawatts net of electricity. Dresden Unit 1, which began commercial operation in 1960 and was retired in 1978, has been designated a Nuclear Historic Landmark by the American Nuclear Society.
Exelon Corporation is one of the nation’s largest electric utilities with more than $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.