Exelon reports that Calvert Cliffs 1 goes offline after component failure

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.

About Wayne Barber 4201 Articles
Wayne Barber, Chief Analyst for the GenerationHub, has been covering power generation, energy and natural resources issues at national publications for more than 20 years. Prior to joining PennWell he was editor of Generation Markets Week at SNL Financial for nine years. He has also worked as a business journalist at both McGraw-Hill and Financial Times Energy. Wayne also worked as a newspaper reporter for several years. During his career has visited nuclear reactors and coal mines as well as coal and natural gas power plants. Wayne can be reached at wayneb@pennwell.com.