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Byron 1 - Plant Information & Status

Detailed technical specifications, licensing info, and upcoming refueling outage schedules for the Byron 1 nuclear power facility.

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Byron 1 Lifecycle: Commissioned Reactor: OFFLINE

Constellation Energy Corporation · Byron
Byron Workers B2RO9
Byron Workers B2RO9

Contact Information

Address: 4450 North German Church Road
Byron, IL 61010
Phone: (815) 234-5441

Technical Specifications

Reactor Type: PWR ( PWR-DRYAMB)
Net Output: 1164 MWe
Thermal Power: 3645 MWt
Efficiency: 31.93%

Licensing & Regulatory Details

Docket #: 05000454
License #: NPF-37 ( OL-FP)
Construction Permit: 1975-12-31
Operating License: 1985-02-14
License Renewed: 2015-11-19
Commercial Ops: 1985-09-16
Expiration Date: 2044-10-31

Site History & Construction

NSS Supplier: WEST 4LP
Constructor: CWE
Architect Engineer: S&L

Current Reactor Status (NRC Data)

0%
OFFLINE
Report Date:
March 20, 2026
Lifecycle: Commissioned | Reactor: OFFLINE
Recent Power History
Date Power Level Visual
Mar 20 0%
Mar 19 0%
Mar 18 0%
Mar 17 0%
Mar 16 0%
Mar 13 0%
Mar 12 0%
Mar 11 0%
Mar 10 0%
Mar 9 0%
Mar 6 0%
Mar 5 0%
Mar 4 0%
Mar 3 0%

Facility Statistics

Lifecycle & Tenure
Op. Age: 40.5 Yrs
Build Time: 9.7 Yrs
Lic. Remain: 18.6 Yrs
Production & Power
Lifetime CF: 94.3%
Efficiency: 31.9%
Generated: 261.7 TWh
Reliability & Outages
Record Run: 543 Days
Refuelings (Since '99): 19
Prediction Acc: 100%