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U.S. Nuclear Reactors

Calvert Cliffs Unit 1

Lusby, Maryland
Local population: 54,464 (10-mile radius)


Pressurized Water Reactor


Licensed to operate from 07/31/74-07/31/34



Safety Issues:

Fire Protection Problems, Groundwater Leaks Reported, Near Misses, Year Plus Outages

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Related Links & Documents

02/18/2010  A roof known for years to leak when it rained allowed rainwater to short out electrical equipment. One reactor automatically shut down. A worn-out protective device that workers had not replaced because of cost-cutting efforts allowed the electrical problem to trigger an automatic shutdown of a second reactor.

09/18/2006   UCS documented the factors leading to the year-plus reactor outage that began in May 1989 in this case study for our Walking a Nuclear Tightrope report.  See details | Download the pdf

07/07/2006  Fission Stories #27 described how jellyfish compelled the operators to reduce the reactor’s power level.