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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.