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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.
51
Excellence
#44 of 94 ↑5
Mid Quartile
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Days of continuous operation since the last outage ended. Clean run (no forced outages since last refueling).
323
Current Run
days ✔
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Longest recorded period of continuous operation between outages (2002-04-07 to 2003-10-06).
547
Record Run
days
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Breaker-to-Breaker runs — continuous operation exceeding the cycle-adjusted threshold (456 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).
89.6%
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.
7.3
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.
98.7%
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
51/100
Mid Quartile · #44/94
5-year window
Turkey Point 4 ranks #44 of 94 active US units on NukeWorker's Operational Excellence Score over the 5-year window. Strongest area: Capacity Factor (79th percentile). Weakest: B2B Avg Streak (19th percentile).
Reliability
52
Capacity factor + Forced outages + B2B streaks
Efficiency
54
Fuel utilization + Refuel duration
Discipline
46
Startup duration + Scram count
Cohort Rankings
apples-to-apples comparison within each peer group
Reactor type:
#31 of 61
PWR
Containment:
#26 of 48
Dry Ambient (PWR)
Cycle length:
#25 of 54
18-month cycle
Fleet rank above (44 of 94) compares all active US units; cohort ranks compare only against units sharing this property.
Per-dimension breakdown (7 metrics)
Capacity Factor
79th
94.3% (higher better, Reliability)
Forced Outage Days/yr
59th
2.8d (lower better, Reliability)
B2B Avg Streak
19th
500d (higher better, Reliability)
Fuel Utilization
60th
98.2% (higher better, Efficiency)
Refuel Duration
47th
33d (lower better, Efficiency)
Startup Duration
23th
6.1d (lower better, Discipline)
Scrams (5-year)
70th
0.2/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:
↑ +4.2 pts vs 2025
Compare Turkey Point 4 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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Estimated fuel remaining in the current cycle, expressed as a percentage of the unit's typical cycle. Starts at 100% when the unit returns to power post-refuel and drops as full-power-days are burned. Days at reduced power burn fuel proportionally — so a unit with significant downtime (high burn deficit) drops slower and ends up with MORE fuel left than its calendar position would suggest. Coastdown threshold around 15%. Toggle to overlay past cycles on a normalized "days into cycle" axis to see how aggressively this unit historically burns down before refuel.
Fuel Burn Down Cycle since Apr 4, 2025
16.8% remaining
404 / 478 days
6.3 FPD margin
Avg refuel: 1.0%
Avg refuel (3yr): 1.3%
Deepest burn: 0.0% (1999-04 → 2000-09)
Most margin: 5.6% (2009-12 → 2011-03)
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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 |
|---|---|---|---|---|---|---|
|
Scram
# 57773
|
2025-06-22 | 2025-06-25 | 4 | 80d | - | - |
|
Scheduled
|
2025-03-01 | 2025-04-03 | 34 | 477d | 2025-03-15 | -14d |
|
Unscheduled
|
2023-11-05 | 2023-11-10 | 6 | 2d | - | - |
|
Scheduled
|
2023-09-30 | 2023-11-03 | 35 | 297d | 2023-09-30 | 0d |
|
Unscheduled
|
2022-12-07 | 2022-12-07 | 1 | 241d | - | - |
|
Scheduled
|
2022-03-12 | 2022-04-10 | 30 | 483d | 2022-03-14 | -2d |
|
Scheduled
|
2020-10-03 | 2020-11-14 | 43 | 75d | 2020-10-05 | -2d |
|
Scram
# 54762
|
2020-07-06 | 2020-07-20 | 15 | 454d | - | - |
|
Scheduled
|
2019-03-11 | 2019-04-09 | 30 | 497d | 2019-03-11 | 0d |
|
Scheduled
|
2017-10-04 | 2017-10-30 | 27 | 18d | 2017-10-02 | +2d |
|
Scram
# 52960
|
2017-09-11 | 2017-09-16 | 6 | 502d | - | - |
|
Scheduled
|
2016-03-29 | 2016-04-27 | 30 | 321d | 2016-03-28 | +1d |
|
Scram
# 51065
|
2015-05-12 | 2015-05-13 | 2 | 2d | - | - |
|
Unscheduled
|
2015-05-08 | 2015-05-10 | 3 | 155d | - | - |
|
Unscheduled
|
2014-12-04 | 2014-12-04 | 1 | 2d | - | - |
|
Unscheduled
|
2014-12-01 | 2014-12-02 | 2 | 41d | - | - |
|
Scheduled
|
2014-09-22 | 2014-10-21 | 30 | 117d | 2014-09-22 | 0d |
|
Scram
# 50140
|
2014-05-26 | 2014-05-28 | 3 | 401d | - | - |
|
Scram
# 48948
|
2013-04-20 | 2013-04-20 | 1 | 14d | - | - |
|
Scheduled
SGR/Major
|
2012-11-05 | 2013-04-06 | 153 | 339d | 2012-11-05 | 0d |
|
Unscheduled
|
2011-11-25 | 2011-12-02 | 8 | 194d | - | - |
|
Unscheduled
|
2011-05-06 | 2011-05-15 | 10 | 6d | - | - |
|
Scheduled
|
2011-03-21 | 2011-04-30 | 41 | 95d | 2011-03-19 | +2d |
|
Unscheduled
|
2010-12-10 | 2010-12-16 | 7 | 77d | - | - |
|
Unscheduled
|
2010-09-22 | 2010-09-24 | 3 | 13d | - | - |
|
Unscheduled
|
2010-09-09 | 2010-09-09 | 1 | 239d | - | - |
|
Unscheduled
|
2010-01-12 | 2010-01-13 | 2 | 41d | - | - |
|
Scheduled
|
2009-10-26 | 2009-12-02 | 38 | 378d | 2009-10-25 | +1d |
|
Unscheduled
|
2008-10-11 | 2008-10-13 | 3 | 49d | - | - |
|
Unscheduled
|
2008-08-16 | 2008-08-23 | 8 | 99d | - | - |
|
Scheduled
|
2008-03-31 | 2008-05-09 | 40 | 30d | 2008-03-30 | +1d |
|
Unscheduled
|
2008-02-27 | 2008-03-01 | 4 | 215d | - | - |
|
Unscheduled
|
2007-07-23 | 2007-07-27 | 5 | 164d | - | - |
|
Unscheduled
|
2007-02-08 | 2007-02-09 | 2 | 61d | - | - |
|
Scheduled
|
2006-10-30 | 2006-12-09 | 41 | 162d | 2006-10-30 | 0d |
|
Unscheduled
|
2006-05-19 | 2006-05-21 | 3 | 88d | - | - |
|
Unscheduled
|
2006-02-20 | 2006-02-20 | 1 | 101d | - | - |
|
Unscheduled
|
2005-10-25 | 2005-11-11 | 18 | 101d | - | - |
|
Unscheduled
|
2005-07-16 | 2005-07-16 | 1 | 4d | - | - |
|
Unscheduled
|
2005-06-27 | 2005-07-12 | 16 | 15d | - | - |
|
Scheduled
|
2005-04-11 | 2005-06-12 | 63 | 18d | 2005-04-10 | +1d |
|
Unscheduled
|
2005-03-22 | 2005-03-24 | 3 | 86d | - | - |
|
Unscheduled
|
2004-12-26 | 2004-12-26 | 1 | 223d | - | - |
|
Unscheduled
|
2004-05-15 | 2004-05-17 | 3 | 193d | - | - |
|
Scheduled
|
2003-10-06 | 2003-11-04 | 30 | 547d | 2003-10-06 | 0d |
|
Scheduled
|
2002-03-23 | 2002-04-07 | 16 | 416d | 2002-03-23 | 0d |
|
Unscheduled
|
2001-01-26 | 2001-01-31 | 6 | 96d | - | - |
|
Scheduled
|
2000-09-25 | 2000-10-22 | 28 | 243d | 2000-09-25 | 0d |
|
Unscheduled
|
2000-01-25 | 2000-01-26 | 2 | 293d | - | - |
|
Scheduled
|
1999-03-15 | 1999-04-07 | 24 | - | 1999-03-15 | 0d |
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