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Calvert Cliffs Unit 2 shut down automatically Monday night because of a leak of hydraulic fluid in the system that opens and closes turbine steam valves on the non-nuclear side of the plant.

All systems responded as designed. Technicians at the Lusby, MD-based facility will repair and fully test the system before returning the unit to service. Unit 1 remains at full power.

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The Unit 2 shut down will not impact electrical service to Exelon customers.

Calvert Cliffs is on the western shore of the Chesapeake Bay in Calvert County and is Maryland’s only nuclear energy facility. The station is home to two pressurized water reactors capable of generating 1,756 megawatts combined.

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Units 1 and 2 began commercial operation in 1975 and 1977, respectively.

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