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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.
50
Excellence
#46 of 94 ↑18
Mid Quartile
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Days of continuous operation since the last outage ended. Clean run (no forced outages since last refueling).
--
Current Run
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Longest recorded period of continuous operation between outages (2018-04-07 to 2020-03-30).
723
Record Run
days
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Breaker-to-Breaker runs — continuous operation exceeding the cycle-adjusted threshold (626 days for this 24-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).
92%
Capacity Factor
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Total number of scheduled refueling outages detected in the historical data.
14
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.
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.
100.0%
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
50/100
Mid Quartile · #46/94
5-year window
Quad Cities 2 ranks #46 of 94 active US units on NukeWorker's Operational Excellence Score over the 5-year window. Strongest area: B2B Avg Streak (83th percentile). Weakest: Scrams (5-year) (16th percentile).
Reliability
59
Capacity factor + Forced outages + B2B streaks
Efficiency
55
Fuel utilization + Refuel duration
Discipline
36
Startup duration + Scram count
Cohort Rankings
apples-to-apples comparison within each peer group
Reactor type:
#14 of 31
BWR
Containment:
#9 of 19
Mark I (BWR)
Cycle length:
#20 of 40
24-month cycle
Fleet rank above (46 of 94) compares all active US units; cohort ranks compare only against units sharing this property.
Per-dimension breakdown (7 metrics)
Capacity Factor
50th
91.0% (higher better, Reliability)
Forced Outage Days/yr
44th
4.6d (lower better, Reliability)
B2B Avg Streak
83th
696d (higher better, Reliability)
Fuel Utilization
31th
97.2% (higher better, Efficiency)
Refuel Duration
79th
24d (lower better, Efficiency)
Startup Duration
56th
4.1d (lower better, Discipline)
Scrams (5-year)
16th
0.8/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:
↑ +6.9 pts vs 2025
Compare Quad Cities 2 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 25, 2026
98.3% remaining
18 / 703 days
5.8 FPD margin
Avg refuel: 3.7%
Avg refuel (3yr): 0.0%
Deepest burn: 0.0% (2018-04 → 2020-03)
Most margin: 11.5% (2004-03 → 2006-03)
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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 |
|---|---|---|---|---|---|---|
|
Unscheduled
|
2026-05-09 | In Outage | 5+ | 16d | - | - |
|
Scheduled
|
2026-03-30 | 2026-04-23 | 25 | 674d | 2026-03-30 | 0d |
|
Scram
# 57141
|
2024-05-24 | 2024-05-25 | 2 | 44d | - | - |
|
Scheduled
|
2024-03-18 | 2024-04-10 | 24 | 218d | 2024-03-17 | +1d |
|
Scram
# 56676
|
2023-08-12 | 2023-08-13 | 2 | 88d | - | - |
|
Unscheduled
|
2023-05-10 | 2023-05-16 | 7 | 185d | - | - |
|
Scram
# 56210
|
2022-11-05 | 2022-11-06 | 2 | 123d | - | - |
|
Scram
# 55975
|
2022-07-04 | 2022-07-05 | 2 | 72d | - | - |
|
Scheduled
|
2022-03-21 | 2022-04-23 | 34 | 707d | 2022-03-21 | 0d |
|
Scheduled
|
2020-03-30 | 2020-04-13 | 15 | 723d | 2020-03-30 | 0d |
|
Scheduled
|
2018-03-19 | 2018-04-07 | 20 | 220d | 2018-03-19 | 0d |
|
Unscheduled
|
2017-08-06 | 2017-08-11 | 6 | 486d | - | - |
|
Scheduled
|
2016-03-21 | 2016-04-07 | 18 | 685d | 2016-03-21 | 0d |
|
Scheduled
|
2014-04-01 | 2014-05-06 | 36 | 429d | 2014-04-07 | -6d |
|
Unscheduled
|
2013-01-27 | 2013-01-27 | 1 | 282d | - | - |
|
Scram
# 47847
|
2012-04-19 | 2012-04-20 | 2 | 3d | - | - |
|
Scheduled
|
2012-03-19 | 2012-04-16 | 29 | 577d | 2012-03-19 | 0d |
|
Unscheduled
|
2010-08-18 | 2010-08-20 | 3 | 122d | - | - |
|
Unscheduled
|
2010-04-16 | 2010-04-18 | 3 | 2d | - | - |
|
Scheduled
|
2010-03-15 | 2010-04-14 | 31 | 450d | 2010-03-15 | 0d |
|
Unscheduled
|
2008-12-13 | 2008-12-20 | 8 | 6d | - | - |
|
Unscheduled
|
2008-12-06 | 2008-12-07 | 2 | 252d | - | - |
|
Scheduled
|
2008-03-03 | 2008-03-29 | 27 | 368d | 2008-03-03 | 0d |
|
Unscheduled
|
2007-02-28 | 2007-03-01 | 2 | 316d | - | - |
|
Scheduled
|
2006-03-25 | 2006-04-18 | 25 | 66d | 2006-03-24 | +1d |
|
Unscheduled
|
2006-01-14 | 2006-01-18 | 5 | 13d | - | - |
|
Unscheduled
|
2005-12-31 | 2006-01-01 | 2 | 229d | - | - |
|
Unscheduled
|
2005-05-09 | 2005-05-16 | 8 | 408d | - | - |
|
Scheduled
|
2004-02-24 | 2004-03-27 | 33 | 241d | 2004-02-24 | 0d |
|
Unscheduled
|
2003-06-11 | 2003-06-28 | 18 | 32d | - | - |
|
Unscheduled
|
2003-05-09 | 2003-05-10 | 2 | 19d | - | - |
|
Unscheduled
|
2003-04-17 | 2003-04-20 | 4 | 270d | - | - |
|
Unscheduled
|
2002-07-12 | 2002-07-21 | 10 | 97d | - | - |
|
Unscheduled
|
2002-04-06 | 2002-04-06 | 1 | 5d | - | - |
|
Unscheduled
|
2002-03-30 | 2002-04-01 | 3 | 26d | - | - |
|
Scheduled
|
2002-02-12 | 2002-03-04 | 21 | 170d | 2002-02-12 | 0d |
|
Unscheduled
|
2001-08-03 | 2001-08-26 | 24 | 138d | - | - |
|
Unscheduled
|
2001-03-17 | 2001-03-18 | 2 | 241d | - | - |
|
Unscheduled
|
2000-07-19 | 2000-07-19 | 1 | 56d | - | - |
|
Unscheduled
|
2000-05-23 | 2000-05-24 | 2 | 17d | - | - |
|
Unscheduled
|
2000-05-06 | 2000-05-06 | 1 | 86d | - | - |
|
Scheduled
|
2000-01-22 | 2000-02-10 | 20 | 328d | 2000-01-22 | 0d |
|
Unscheduled
|
1999-02-20 | 1999-02-28 | 9 | - | - | - |
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