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Calvert Cliffs 1 - Plant Information & Status

Technical specifications, contact data, ratings, and licensing history for the Calvert Cliffs facility.

Ratings 70 votes

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Community ratings from NukeWorker members. Vote to share your experience working at this facility. Results show the breakdown of Above Average, Average, and Below Average ratings.

Capacity Factor (365-Day)

100%
Current
88.4%
365-Day Avg
#59
of 94 plants
Min: 0% Max: 100% 42 days <80%

Scram History 6 events since 2011

6
Total
5
Automatic
1
Manual
1.3
Avg Recovery (days)
Recent Events
2016-05-30 Auto CALVERT CLIFFS LOSS OF LOAD TURBINE/REACTOR TRIP FROM 100 PE...
2016-01-24 Manual MANUAL REACTOR TRIP DUE TO ELEVATED CONDENSER SODIUM LEVELS ...
2015-04-06 Auto DUAL UNIT AUTOMATIC REACTOR TRIPS DUE TO A VOLTAGE TRANSIENT...
2014-04-30 Auto AUTOMATIC REACTOR TRIP "At 1016 [EDT] CCNPP [Calvert Cliffs ...
2014-01-20 Auto DUAL UNIT TRIP ON THE LOSS OF THE "21" 13KV BUS "Dual Unit T...
2011-08-26 Auto UNUSUAL EVENT - TRANSFORMER EXPLOSION NEAR TURBINE BUILDING ...

Performance Charts

Outage Duration Trend

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Scheduled refueling outage durations over time. Green bars are below average, yellow near average, red above. Dashed line shows the plant's historical average. Shorter outages mean better execution.

Power History (12-Month)

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Daily power output as a percentage of rated capacity over the past 365 days. Green segments indicate full power (90%+), yellow shows reduced output, and red indicates significant power reductions or shutdowns.

Outage Timeline

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Visual timeline of all recorded outages. Blue bars are scheduled refueling outages, red bars are forced/unplanned outages. Width represents outage duration. Hover for details.

Facility Statistics

Lifecycle & Tenure
Operating Age: 50.9 Yrs
Build Time: 5.8 Yrs
Lic. Remaining: 8.3 Yrs
Production & Power
Lifetime CF: 93%
Efficiency: 31.6%
Generated: 192.3 TWh
Reliability & Outages
Record Run: 716 Days
Refuelings: 14

Ownership & Construction

Owner/Operator: Constellation Energy
Architect Engineer: BECH
Constructor: BECH

Technical Specs

Reactor Type: PWR
Containment: PWR-DRYAMB
NSS Supplier: COMB CE
Thermal Power: 2737 MWt
Net Capacity: 866 MWe
Efficiency: 31.6%
Status: Operating

Licensing

Docket #: 05000317
License #: DPR-53
License Type: OL-FP
Const. Permit: 1969-07-07
Operating Lic: 1974-07-31
Commercial Op: 1975-05-08
License Renewed: 2000-03-23
License Exp: 2034-07-31

Facility Map

38.4335, -76.4427

Location & Contact

Address:
1650 Calvert Cliffs Parkway
Lusby, MD 20657, USA
Get Directions
Phone: (410) 495-4600

Breaker-to-Breaker Runs 4 runs

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Breaker-to-breaker runs measure continuous operation between refueling outages (470+ days). An active streak means the unit has been running continuously since the last refueling. Longer runs indicate better reliability.
714
Best Run (days)
2022-02-28 → 2024-02-12
685
Avg Run (days)
All Runs
2022-02-28 2024-02-12 714 days
2020-03-13 2022-02-07 696 days
2018-03-18 2020-02-17 701 days
2016-06-02 2018-02-19 627 days