Calvert Cliffs Nuclear Power Plant

The Calvert Cliffs Nuclear Power Plant is a nuclear power plant located on the western shore of the Chesapeake Bay near Lusby, Calvert County, Maryland in the Mid-Atlantic United States.OverviewThe plant, owned and operated by CENG, a joint venture between Exelon and Électricité de France, has two 2737 megawatt thermal (MWth) Combustion Engineering Generation II two-loop pressurized water reactors. Each generating plant (CCNPP 1&2) produces approximately 850 megawatt electrical (MWe) net or 900 MWe gross. Each plant's electrical load consumes approximately 50 MWe. These are saturated steam plants (non-superheated) and are approximately 33% efficient (ratio of 900 MWe gross/2700 MWth core). Only the exhaust of the single high-pressure main turbine is slightly superheated by a two-stage reheater before delivering the superheated steam in parallel to the three low-pressure turbines. Unit 1 uses a General Electric–designed main turbine and generator, while Unit 2 uses a Westinghouse–designed main turbine and generator. The heat produced by the reactor is returned to the bay, which operates as a cooling heat-sink for the plant.Unit 1 went into commercial service in 1975 and Unit 2 in 1977. The total cost of the two units was approximately 766 million USD.Unit 1 had its two steam generators replaced in 2002 and its reactor vessel closure head replaced in 2006, while unit 2 had its two steam generators replaced in 2003, and its vessel closure head replaced in 2007.