Exelon (NYSE:EXC) reported late May 31 that its Calvert Cliffs 1 nuclear unit in Maryland had shut down automatically at 4:26 p.m. due to an electrical component failure on the non-nuclear side of the plant.
All systems responded as designed and Unit 2 remains at full power, Exelon said in a news release. Unit 1 remained offline as of early June 1, according to Nuclear Regulatory Commission (NRC) data.
The electrical component detects moisture in steam. Moisture in the steam can affect the operation of the unit’s turbine. Technicians will determine the cause of the malfunction and replace and fully test the module before returning the unit to service.
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.
Exelon completed its most recent refueling outage at Unit 1 in March.