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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.
42
Excellence
#62 of 94 →
Mid Quartile
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Days of continuous operation since the last outage ended. Clean run (no forced outages since last refueling).
197
Current Run
days ✔
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Longest recorded period of continuous operation between outages (2019-10-16 to 2021-09-27).
712
Record Run
days
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Breaker-to-Breaker runs — continuous operation exceeding the cycle-adjusted threshold (623 days for this 24-month cycle unit) with no trips to 0% power.
3
B2B Runs
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Lifetime capacity factor: average power level across all recorded days (100% = always at full power).
89.1%
Capacity Factor
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Total number of scheduled refueling outages detected in the historical data.
16
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.
8.7
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.
98.8%
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
42/100
Mid Quartile · #62/94
5-year window
Clinton ranks #62 of 94 active US units on NukeWorker's Operational Excellence Score over the 5-year window. Strongest area: B2B Avg Streak (77th percentile). Weakest: Startup Duration (17th percentile).
Reliability
58
Capacity factor + Forced outages + B2B streaks
Efficiency
46
Fuel utilization + Refuel duration
Discipline
23
Startup duration + Scram count
Cohort Rankings
apples-to-apples comparison within each peer group
Reactor type:
#18 of 31
BWR
Containment:
#1 of 4
Mark III (BWR)
Cycle length:
#26 of 40
24-month cycle
Fleet rank above (62 of 94) compares all active US units; cohort ranks compare only against units sharing this property.
Per-dimension breakdown (7 metrics)
Capacity Factor
64th
92.8% (higher better, Reliability)
Forced Outage Days/yr
33th
6.0d (lower better, Reliability)
B2B Avg Streak
77th
691d (higher better, Reliability)
Fuel Utilization
22th
96.4% (higher better, Efficiency)
Refuel Duration
69th
27d (lower better, Efficiency)
Startup Duration
17th
7.0d (lower better, Discipline)
Scrams (5-year)
30th
0.6/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:
Stable vs 2025
Compare Clinton 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 Oct 5, 2025
70.5% remaining
220 / 697 days
14.6 FPD margin
Avg refuel: 17.0%
Avg refuel (3yr): 1.2%
Deepest burn: 0.7% (2019-10 → 2021-09)
Most margin: 55.4% (2017-06 → 2018-04)
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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
# 58002
|
2025-10-23 | 2025-10-29 | 7 | 16d | - | - |
|
Scram
# 57967
|
2025-10-07 | 2025-10-07 | 1 | 4d | - | - |
|
Scheduled
|
2025-09-08 | 2025-10-03 | 26 | 701d | 2025-09-08 | 0d |
|
Scheduled
|
2023-09-11 | 2023-10-08 | 28 | 106d | 2023-09-11 | 0d |
|
Unscheduled
|
2023-05-28 | 2023-05-28 | 1 | 5d | - | - |
|
Unscheduled
|
2023-05-13 | 2023-05-23 | 11 | 99d | - | - |
|
Scram
# 56328
|
2023-02-01 | 2023-02-03 | 3 | 379d | - | - |
|
Unscheduled
|
2022-01-16 | 2022-01-18 | 3 | 79d | - | - |
|
Unscheduled
|
2021-10-29 | 2021-10-29 | 1 | 4d | - | - |
|
Scheduled
|
2021-09-27 | 2021-10-25 | 29 | 712d | 2021-09-27 | 0d |
|
Scheduled
|
2019-09-17 | 2019-10-16 | 30 | 43d | 2019-09-16 | +1d |
|
Scram
# 54197
|
2019-08-03 | 2019-08-05 | 3 | 272d | - | - |
|
Scram
# 53698
|
2018-10-29 | 2018-11-04 | 7 | 162d | - | - |
|
Scheduled
|
2018-04-30 | 2018-05-20 | 21 | 136d | 2018-04-30 | 0d |
|
Scram
# 53110
|
2017-12-10 | 2017-12-15 | 6 | 182d | - | - |
|
Scram
# 52800
|
2017-06-11 | 2017-06-11 | 1 | 9d | - | - |
|
Scram
# 52777
|
2017-05-31 | 2017-06-02 | 3 | 3d | - | - |
|
Scheduled
|
2017-05-09 | 2017-05-28 | 20 | 348d | 2017-05-08 | +1d |
|
Unscheduled
|
2016-05-17 | 2016-05-26 | 10 | 367d | - | - |
|
Scheduled
|
2015-04-28 | 2015-05-16 | 19 | 94d | 2015-04-27 | +1d |
|
Unscheduled
|
2015-01-22 | 2015-01-24 | 3 | 302d | - | - |
|
Scram
# 49958
|
2014-03-26 | 2014-03-26 | 1 | 3d | - | - |
|
Unscheduled
|
2014-03-21 | 2014-03-23 | 3 | 97d | - | - |
|
Scram
# 49632
|
2013-12-14 | 2013-12-14 | 1 | 2d | - | - |
|
Scram
# 49617
|
2013-12-09 | 2013-12-12 | 4 | 42d | - | - |
|
Scheduled
|
2013-10-08 | 2013-10-28 | 21 | 164d | 2013-10-07 | +1d |
|
Scram
# 48974
|
2013-04-27 | 2013-04-27 | 1 | 50d | - | - |
|
Scram
# 48812
|
2013-03-08 | 2013-03-08 | 1 | 444d | - | - |
|
Scheduled
|
2011-11-30 | 2011-12-20 | 21 | 664d | 2011-11-30 | 0d |
|
Scheduled
|
2010-01-11 | 2010-02-04 | 25 | 79d | 2010-01-11 | 0d |
|
Unscheduled
|
2009-10-16 | 2009-10-24 | 9 | 14d | - | - |
|
Unscheduled
|
2009-09-30 | 2009-10-02 | 3 | 597d | - | - |
|
Unscheduled
Startup Hold
|
2008-02-11 | 2008-02-11 | 1 | 7d | - | - |
|
Scheduled
|
2008-01-12 | 2008-02-04 | 24 | 206d | 2008-01-14 | -2d |
|
Unscheduled
|
2007-06-20 | 2007-06-20 | 1 | 295d | - | - |
|
Unscheduled
|
2006-08-28 | 2006-08-29 | 2 | 160d | - | - |
|
Unscheduled
|
2006-03-21 | 2006-03-21 | 1 | 24d | - | - |
|
Scheduled
|
2006-01-31 | 2006-02-25 | 26 | 324d | 2006-01-30 | +1d |
|
Unscheduled
|
2005-03-12 | 2005-03-13 | 2 | 10d | - | - |
|
Unscheduled
|
2005-02-23 | 2005-03-02 | 8 | 221d | - | - |
|
Unscheduled
|
2004-07-14 | 2004-07-17 | 4 | 112d | - | - |
|
Unscheduled
|
2004-03-23 | 2004-03-24 | 2 | 28d | - | - |
|
Scheduled
|
2004-02-03 | 2004-02-24 | 22 | 61d | 2004-02-03 | 0d |
|
Unscheduled
|
2003-12-03 | 2003-12-04 | 2 | 235d | - | - |
|
Unscheduled
|
2003-04-11 | 2003-04-12 | 2 | 281d | - | - |
|
Unscheduled
|
2002-07-04 | 2002-07-04 | 1 | 52d | - | - |
|
Unscheduled
|
2002-05-13 | 2002-05-13 | 1 | 9d | - | - |
|
Scheduled
|
2002-04-02 | 2002-05-04 | 33 | 107d | 2002-04-02 | 0d |
|
Unscheduled
|
2001-12-16 | 2001-12-16 | 1 | 145d | - | - |
|
Unscheduled
|
2001-07-24 | 2001-07-24 | 1 | 58d | - | - |
|
Unscheduled
|
2001-05-26 | 2001-05-27 | 2 | 110d | - | - |
|
Unscheduled
|
2001-02-04 | 2001-02-05 | 2 | 45d | - | - |
|
Unscheduled
|
2000-12-19 | 2000-12-21 | 3 | 39d | - | - |
|
Scheduled
|
2000-10-15 | 2000-11-10 | 27 | 67d | 2000-10-15 | 0d |
|
Unscheduled
|
2000-08-02 | 2000-08-09 | 8 | 58d | - | - |
|
Unscheduled
|
2000-06-03 | 2000-06-05 | 3 | 12d | - | - |
|
Unscheduled
|
2000-05-18 | 2000-05-22 | 5 | 362d | - | - |
|
Unscheduled
|
1999-05-20 | 1999-05-22 | 3 | 2d | - | - |
|
Unscheduled
|
1999-05-15 | 1999-05-18 | 4 | 9d | - | - |
|
Scheduled
SGR/Major
|
1999-01-01 | 1999-05-06 | 126 | - | 1999-01-01 | 0d |
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