The Exelon (NYSE:EXC) Calvert Cliffs Unit 2 shut down automatically at 10:24 p.m. on Dec. 3 due to 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 will repair and fully test the system before returning the unit to service. Unit 1 remains at full power, Exelon said in a news release. The Unit 2 shut down will not affect electrical service to Exelon customers.
Calvert Cliffs is located 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 MW combined. Units 1 and 2 began commercial operation in 1975 and 1977, respectively.
The two-unit nuclear station had a capacity factor of 91.4% during 2015, according to GenerationHub data.