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LaSalle 1 - Plant Information & Status

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

Ratings 33 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
90.2%
365-Day Avg
#85
of 94 plants
Min: 0% Max: 100% 36 days <80%

Scram History 6 events since 2011

6
Total
5
Automatic
1
Manual
1.8
Avg Recovery (days)
Recent Events
2025-12-27 Manual MANUAL REACTOR SCRAM DUE TO RCS LEAK The following informati...
2025-11-01 Auto AUTOMATIC REACTOR SCRAM The following information was provid...
2017-02-16 Auto AUTOMATIC REACTOR SCRAM RESULTING FROM FEEDWATER REGULATING ...
2017-02-12 Auto UNIT 1 AUTOMATIC REACTOR SCRAM DUE TO MAIN GENERATOR TRIP ON...
2013-04-16 Auto NOTIFICATION OF UNUSUAL EVENT DECLARED DUE TO LOSS OF OFFSIT...
2011-01-31 Auto REACTOR SCRAM AFTER A MAIN TRANSFORMER TRIP "At 1918 CST on ...

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: 42.3 Yrs
Build Time: 10.3 Yrs
Lic. Remaining: 16 Yrs
Production & Power
Lifetime CF: 94.1%
Efficiency: 31.9%
Generated: 254.1 TWh
Reliability & Outages
Record Run: 740 Days
Refuelings: 13

Ownership & Construction

Owner/Operator: Constellation Energy
Architect Engineer: S&L
Constructor: CWE

Technical Specs

Reactor Type: BWR
Containment: BWR-MARK 2
NSS Supplier: GE 5
Thermal Power: 3546 MWt
Net Capacity: 1131 MWe
Efficiency: 31.9%
Status: Operating

Licensing

Docket #: 05000373
License #: NPF-11
License Type: OL-FP
Const. Permit: 1973-09-10
Operating Lic: 1982-04-17
Commercial Op: 1984-01-01
License Renewed: 2016-10-19
License Exp: 2042-04-17

Facility Map

41.2455, -88.6688

Location & Contact

Address:
2601 North 21st Road
Marseilles, IL 61341, USA
Get Directions
Phone: (815) 357-6761

Breaker-to-Breaker Runs 5 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.
738
Best Run (days)
2004-02-13 → 2006-02-20
666
Avg Run (days)
All Runs
2022-03-19 2024-02-19 702 days
2020-02-29 2022-02-21 723 days
2014-10-21 2016-02-15 482 days
2006-03-19 2008-02-04 687 days
2004-02-13 2006-02-20 738 days