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Composite Operational Excellence Score (0-100) — average percentile rank across 7 dimensions in three sub-scores: Reliability (capacity factor, forced outage days, B2B avg streak), Efficiency (fuel utilization, refuel duration), and Discipline (startup duration, scram count). 5-year window. Higher = more operationally excellent. Click to see the full breakdown.
32
Excellence
#77 of 94 ↓4
Bottom Quartile
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Days of continuous operation since the last outage ended. Has forced outage(s) since last refueling.
3
Current Run
days
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Longest recorded period of continuous operation between outages (2021-11-19 to 2023-04-08).
505
Record Run
days
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Breaker-to-Breaker runs — continuous operation exceeding the cycle-adjusted threshold (403 days for this 18-month cycle unit) with no trips to 0% power.
4
B2B Runs
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Lifetime capacity factor: average power level across all recorded days (100% = always at full power).
87.5%
Capacity Factor
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Total number of scheduled refueling outages detected in the historical data.
18
Outages
since 1999
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Average time from first power generation (>0%) to sustained full power (≥95% for 2+ days) across the last 3 scheduled outages. Click to compare against the fleet on the Operator Efficiency Leaderboard.
5.3
Avg Startup
days (last 3)
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Average fuel utilization — percent of the designed fuel cycle that this unit consumes before refueling, derived from the historical burn-down trajectory. Higher = more efficient operator (refuels with less margin remaining; closer to coastdown). Computed as 100% minus the unit's average refuel-point fuel %, using the last 3 years where available, otherwise lifetime average. Click to compare against the fleet on the Operator Efficiency Leaderboard.
93.6%
Fuel Utilization
3yr avg
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NukeWorker's Operational Excellence Score is a composite 0–100 ranking of every active US nuclear unit across 7 publicly observable performance metrics, grouped into three sub-scores:
• Reliability — capacity factor, forced outage days, B2B avg streak
• Efficiency — fuel utilization, refuel duration
• Discipline — startup duration, scram count
Each unit's metric is converted to a percentile across the active fleet. Sub-score = average of its components; composite = average of the three sub-scores. Use the time-window toggle below to switch between 3yr / 5yr / lifetime.
• Reliability — capacity factor, forced outage days, B2B avg streak
• Efficiency — fuel utilization, refuel duration
• Discipline — startup duration, scram count
Each unit's metric is converted to a percentile across the active fleet. Sub-score = average of its components; composite = average of the three sub-scores. Use the time-window toggle below to switch between 3yr / 5yr / lifetime.
Time window
— change how far back we look
NukeWorker's
Operational
Excellence Score
Operational
Excellence Score
32/100
Bottom Quartile · #77/94
5-year window
Turkey Point 3 ranks #77 of 94 active US units on NukeWorker's Operational Excellence Score over the 5-year window. Strongest area: Forced Outage Days/yr (59th percentile). Weakest: B2B Avg Streak (4th percentile).
Reliability
24
Capacity factor + Forced outages + B2B streaks
Efficiency
53
Fuel utilization + Refuel duration
Discipline
19
Startup duration + Scram count
Cohort Rankings
apples-to-apples comparison within each peer group
Reactor type:
#53 of 61
PWR
Containment:
#43 of 48
Dry Ambient (PWR)
Cycle length:
#44 of 54
18-month cycle
Fleet rank above (77 of 94) compares all active US units; cohort ranks compare only against units sharing this property.
Per-dimension breakdown (7 metrics)
Capacity Factor
11th
81.3% (higher better, Reliability)
Forced Outage Days/yr
59th
2.8d (lower better, Reliability)
B2B Avg Streak
4th
481d (higher better, Reliability)
Fuel Utilization
53th
98.1% (higher better, Efficiency)
Refuel Duration
53th
32d (lower better, Efficiency)
Startup Duration
32th
5.5d (lower better, Discipline)
Scrams (5-year)
7th
1.0/yr (lower better, Discipline)
Each dimension's percentile is computed across the active US fleet (94 units with sufficient history). Sub-score = average of its component percentiles. Composite = average of the three sub-scores. 5-year window. View full leaderboard →
Methodology
NukeWorker's Operational Excellence Score is a composite ranking that combines 7 publicly observable performance metrics into a single 0-100 number per US nuclear unit.
How it's computed: Each unit's raw value is converted to a percentile (0-100) within the 94 active US units that have at least 2 completed refueling cycles. The 7 percentiles are averaged into 3 sub-scores (Reliability, Efficiency, Discipline), and those are averaged into the final composite.
Active window — 5-year:
- Reliability — Capacity factor (5yr), forced outage days/yr (5yr), B2B avg streak (lifetime)
- Efficiency — in-cycle fuel utilization (3yr), median refuel duration (5yr)
- Discipline — robust mean startup duration, scrams/yr (5yr, annualised)
Cohort rankings: alongside the fleet rank, each unit gets ranked within its reactor type (PWR/BWR), containment design (Ice Condenser, Mark I, etc.), and cycle length (12/18/24-month). Useful for apples-to-apples comparisons.
What's excluded: subjective community ratings, confidential INPO ratings, financial metrics. We only use publicly available NRC + cycle data.
Why three windows? 5yr (default) is the industry standard. 3yr captures recent operational changes and post-pandemic recovery. Lifetime gives newer units a fair comparison and reveals long-term consistency.
Edge cases: units with fewer than 2 cycles (e.g., Vogtle 4) show "Provisional". Decommissioned units excluded.
Refresh cadence: recomputed daily. Each window cached separately.
A data-derived proxy for operational performance; not affiliated with INPO. INPO ratings are confidential and qualitative — ours is public and quantitative.
5-yr trend:
↓ -3.0 pts vs 2025
Compare Turkey Point 3 head-to-head with up to 3 other units.
Compare now
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Duration of each outage in days, shown chronologically. Green bars are scheduled refueling outages, red bars are forced/unscheduled. The orange dashed line marks the average duration. Extended outages (>180 days) and D&D periods are excluded.
Outage Duration Trend
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Days between consecutive scheduled refueling outage starts, showing operating cycle regularity. The purple dashed line marks the average cycle length. Most U.S. reactors operate on 18-month (547 day) or 24-month (730 day) cycles.
Cycle Length History
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Time in days from first power generation (>0%) to sustained full power (≥95% for 2+ consecutive days) after each scheduled refueling outage. The dashed line marks the average. Includes startup testing holds and power dips.
Startup Duration Trend
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Monthly capacity factor with outage events overlaid as red bands. Green bars show average power level per month. Toggle to Daily view for raw daily data.
Power History
| Type ⇅ | Actual Start ⇅ | Actual End ⇅ | Duration ⇅ | Days Online ⇅ | Scheduled | Delta |
|---|---|---|---|---|---|---|
| 2026-02-04 | 2026-05-11 | 97 | 177d | 2026-03-07 | -31d | |
|
Scram
# 57857
|
2025-08-10 | 2025-08-11 | 2 | 247d | - | - |
|
Scram
# 57453
|
2024-12-05 | 2024-12-06 | 2 | 21d | - | - |
|
Scheduled
|
2024-10-13 | 2024-11-14 | 33 | 354d | 2024-10-19 | -6d |
|
Scram
# 56813
|
2023-10-25 | 2023-10-25 | 1 | 32d | - | - |
|
Scram
# 56755
|
2023-09-23 | 2023-09-23 | 1 | 49d | - | - |
|
Scram
# 56658
|
2023-08-05 | 2023-08-05 | 1 | 92d | - | - |
|
Scheduled
|
2023-04-08 | 2023-05-05 | 28 | 505d | 2023-03-16 | +23d |
|
Scheduled
|
2021-10-09 | 2021-11-19 | 42 | 54d | 2021-10-04 | +5d |
|
Unscheduled
|
2021-08-14 | 2021-08-16 | 3 | 163d | - | - |
|
Scram
# 55117
|
2021-03-02 | 2021-03-04 | 3 | 190d | - | - |
|
Scram
# 54847
|
2020-08-18 | 2020-08-24 | 7 | 116d | - | - |
|
Unscheduled
Startup Hold
|
2020-04-24 | 2020-04-24 | 1 | 2d | - | - |
|
Scheduled
|
2020-03-30 | 2020-04-22 | 24 | 316d | 2020-03-30 | 0d |
|
Scram
# 54072
|
2019-05-19 | 2019-05-19 | 1 | 193d | - | - |
|
Scheduled
|
2018-10-01 | 2018-11-07 | 38 | 308d | 2018-10-01 | 0d |
|
Unscheduled
|
2017-11-21 | 2017-11-27 | 7 | 70d | - | - |
|
Unscheduled
|
2017-09-09 | 2017-09-12 | 4 | 136d | - | - |
|
Scheduled
|
2017-03-19 | 2017-04-26 | 39 | 230d | 2017-03-27 | -8d |
|
Scram
# 52136
|
2016-07-30 | 2016-08-01 | 3 | 241d | - | - |
|
Scheduled
|
2015-10-19 | 2015-12-02 | 45 | 169d | 2015-10-18 | +1d |
|
Unscheduled
|
2015-04-30 | 2015-05-03 | 4 | 260d | - | - |
|
Scram
# 50354
|
2014-08-12 | 2014-08-13 | 2 | 110d | - | - |
|
Scheduled
|
2014-03-17 | 2014-04-24 | 39 | 305d | 2014-03-17 | 0d |
|
Scram
# 49021
|
2013-05-11 | 2013-05-16 | 6 | 59d | - | - |
|
Scram
# 48817
|
2013-03-13 | 2013-03-13 | 1 | 3d | - | - |
|
Scram
# 48764
|
2013-02-18 | 2013-03-10 | 21 | 4d | - | - |
|
Scram
# 48744
|
2013-02-12 | 2013-02-14 | 3 | 166d | - | - |
|
Unscheduled
|
2012-08-26 | 2012-08-30 | 5 | 6d | - | - |
|
Unscheduled
|
2012-08-19 | 2012-08-20 | 2 | 4d | - | - |
|
Scheduled
SGR/Major
|
2012-02-26 | 2012-08-15 | 172 | 134d | 2012-01-30 | +27d |
|
Unscheduled
|
2011-10-04 | 2011-10-15 | 12 | 206d | - | - |
|
Scram
# 46660
|
2011-03-07 | 2011-03-12 | 6 | 111d | - | - |
|
Unscheduled
|
2010-11-16 | 2010-11-16 | 1 | 9d | - | - |
|
Scheduled
|
2010-09-24 | 2010-11-07 | 45 | 504d | 2010-09-27 | -3d |
|
Scheduled
|
2009-03-16 | 2009-05-08 | 54 | 378d | 2009-03-01 | +15d |
|
Unscheduled
|
2008-02-27 | 2008-03-03 | 6 | 138d | - | - |
|
Scheduled
|
2007-09-03 | 2007-10-12 | 40 | 74d | 2007-09-10 | -7d |
|
Unscheduled
|
2007-06-19 | 2007-06-21 | 3 | 2d | - | - |
|
Unscheduled
|
2007-06-07 | 2007-06-17 | 11 | 425d | - | - |
|
Scheduled
|
2006-03-06 | 2006-04-08 | 34 | 65d | 2006-03-06 | 0d |
|
Unscheduled
|
2005-12-30 | 2005-12-31 | 2 | 64d | - | - |
|
Unscheduled
|
2005-10-25 | 2005-10-27 | 3 | 7d | - | - |
|
Unscheduled
|
2005-10-16 | 2005-10-18 | 3 | 283d | - | - |
|
Unscheduled
|
2005-01-04 | 2005-01-06 | 3 | 3d | - | - |
|
Unscheduled
|
2004-12-29 | 2005-01-01 | 4 | 11d | - | - |
|
Unscheduled
|
2004-12-15 | 2004-12-18 | 4 | 15d | - | - |
|
Scheduled
|
2004-09-27 | 2004-11-30 | 65 | 495d | 2004-09-26 | +1d |
|
Unscheduled
|
2003-05-21 | 2003-05-21 | 1 | 20d | - | - |
|
Unscheduled
|
2003-04-29 | 2003-05-01 | 3 | 32d | - | - |
|
Scheduled
|
2003-03-01 | 2003-03-28 | 28 | 31d | 2003-03-01 | 0d |
|
Unscheduled
|
2003-01-28 | 2003-01-29 | 2 | 459d | - | - |
|
Scheduled
|
2001-09-30 | 2001-10-26 | 27 | 44d | 2001-09-30 | 0d |
|
Unscheduled
|
2001-08-15 | 2001-08-17 | 3 | 4d | - | - |
|
Unscheduled
|
2001-08-11 | 2001-08-11 | 1 | 504d | - | - |
|
Scheduled
|
2000-02-28 | 2000-03-25 | 27 | 103d | 2000-02-28 | 0d |
|
Unscheduled
|
1999-11-17 | 1999-11-17 | 1 | 146d | - | - |
|
Unscheduled
|
1999-06-24 | 1999-06-24 | 1 | - | - | - |
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