NukeWorker Menu

South Texas 1 - Plant Information & Status

Technical specifications, contact data, ratings, and licensing history for the South Texas Project (STP) facility.

Current Reactor Status

?
Current power output from NRC daily reactor status reports. Shows the most recent power level as a percentage of rated capacity, along with a 14-day power history.

Ratings 40 votes

?
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)

0%
Current
95.7%
365-Day Avg
#29
of 94 plants
Min: 0% Max: 100% 16 days <80%

Scram History 5 events since 2011

5
Total
3
Automatic
2
Manual
2.4
Avg Recovery (days)
Recent Events
2024-07-23 Auto EN Revision Imported Date: 7/30/2024 EN Revision Text: NOTIF...
2021-02-14 Auto EN Revision Imported Date: 2/17/2021 EN Revision Text: AUTOM...
2016-04-30 Auto AUTOMATIC REACTOR TRIP DUE TO GENERATOR LOCKOUT "At 2021 [CD...
2016-01-25 Manual MANUAL REACTOR TRIP DUE TO LOSS OF FEEDWATER TO A SINGLE STE...
2015-12-20 Manual MANUAL REACTOR TRIP DUE TO FEEDWATER ISOLATION "At 1519 [CST...

Performance Charts

Outage Duration Trend

?
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)

?
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

?
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: 37.6 Yrs
Build Time: 12.7 Yrs
Lic. Remaining: 21.4 Yrs
Production & Power
Lifetime CF: 89.8%
Efficiency: 33.2%
Generated: 274.5 TWh
Reliability & Outages
Record Run: 580 Days
Refuelings: 18

Ownership & Construction

Owner/Operator: STP Nuclear Operating
Architect Engineer: BECH
Constructor: EBSO

Technical Specs

Reactor Type: PWR
Containment: PWR-DRYAMB
NSS Supplier: WEST 4LP
Thermal Power: 3853 MWt
Net Capacity: 1280 MWe
Efficiency: 33.2%
Status: Operating

Licensing

Docket #: 05000498
License #: NPF-76
License Type: OL-FP
Const. Permit: 1975-12-22
Operating Lic: 1988-03-22
Commercial Op: 1988-08-25
License Renewed: 2017-09-28
License Exp: 2047-08-20

Facility Map

28.7961, -96.0562

Location & Contact

Address:
8 miles west of Wadsworth on Farm Road 521
Palacious, TX 77465, USA
Get Directions
Phone: (512) 972-3611

Breaker-to-Breaker Runs 9 runs

?
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.
532
Best Run (days)
2005-04-17 → 2006-10-01
511
Avg Run (days)
All Runs
2024-11-11 2026-03-21 495 days
2021-11-08 2023-03-18 495 days
2018-11-12 2020-03-14 488 days
2017-04-30 2018-10-06 524 days
2014-06-02 2015-10-18 503 days
2011-05-09 2012-10-21 531 days
2008-04-27 2009-10-01 522 days
2006-11-04 2008-03-30 512 days
2005-04-17 2006-10-01 532 days