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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
#41 of 94 ↓6
Mid Quartile
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Days of continuous operation since the last outage ended. Clean run (no forced outages since last refueling).
43
Current Run
days ✔
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Longest recorded period of continuous operation between outages (2020-04-01 to 2022-03-07).
705
Record Run
days
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Breaker-to-Breaker runs — continuous operation exceeding the cycle-adjusted threshold (621 days for this 24-month cycle unit) with no trips to 0% power.
1
B2B Runs
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Lifetime capacity factor: average power level across all recorded days (100% = always at full power).
91.9%
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.
4
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.
99.0%
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
51/100
Mid Quartile · #41/94
5-year window
Nine Mile Point 2 ranks #41 of 94 active US units on NukeWorker's Operational Excellence Score over the 5-year window. Strongest area: B2B Avg Streak (89th percentile). Weakest: Scrams (5-year) (16th percentile).
Reliability
63
Capacity factor + Forced outages + B2B streaks
Efficiency
54
Fuel utilization + Refuel duration
Discipline
36
Startup duration + Scram count
Cohort Rankings
apples-to-apples comparison within each peer group
Reactor type:
#13 of 31
BWR
Containment:
#5 of 8
Mark II (BWR)
Cycle length:
#19 of 40
24-month cycle
Fleet rank above (41 of 94) compares all active US units; cohort ranks compare only against units sharing this property.
Per-dimension breakdown (7 metrics)
Capacity Factor
58th
92.3% (higher better, Reliability)
Forced Outage Days/yr
42th
4.8d (lower better, Reliability)
B2B Avg Streak
89th
704d (higher better, Reliability)
Fuel Utilization
26th
96.9% (higher better, Efficiency)
Refuel Duration
83th
22d (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:
↓ -2.1 pts vs 2025
Compare Nine Mile Point 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 2, 2026
94.4% remaining
41 / 706 days
1.7 FPD margin
Avg refuel: 4.7%
Avg refuel (3yr): 1.0%
Deepest burn: 0.3% (2008-04 → 2010-04)
Most margin: 12.9% (2012-06 → 2014-03)
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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 |
|---|---|---|---|---|---|---|
|
Scheduled
|
2026-03-09 | 2026-04-01 | 24 | 528d | 2026-03-07 | +2d |
|
Scram
# 57334
|
2024-09-24 | 2024-09-27 | 4 | 182d | - | - |
|
Scheduled
|
2024-03-04 | 2024-03-26 | 23 | 180d | 2024-03-03 | +1d |
|
Scram
# 56710
|
2023-09-03 | 2023-09-06 | 4 | 355d | - | - |
|
Unscheduled
|
2022-09-05 | 2022-09-13 | 9 | 150d | - | - |
|
Scram
# 55821
|
2022-04-05 | 2022-04-08 | 4 | 10d | - | - |
|
Scheduled
|
2022-03-07 | 2022-03-26 | 20 | 705d | 2022-03-07 | 0d |
|
Scheduled
|
2020-03-05 | 2020-04-01 | 28 | 555d | 2020-03-09 | -4d |
|
Scram
# 53565
|
2018-08-27 | 2018-08-28 | 2 | 107d | - | - |
|
Scheduled
|
2018-04-16 | 2018-05-12 | 27 | 252d | 2018-04-16 | 0d |
|
Scram
# 52889
|
2017-08-06 | 2017-08-07 | 2 | 246d | - | - |
|
Unscheduled
|
2016-11-25 | 2016-12-03 | 9 | 204d | - | - |
|
Scheduled
|
2016-04-11 | 2016-05-05 | 25 | 414d | 2016-04-11 | 0d |
|
Scram
# 50830
|
2015-02-19 | 2015-02-22 | 4 | 298d | - | - |
|
Scheduled
|
2014-03-24 | 2014-04-27 | 35 | 13d | 2014-03-23 | +1d |
|
Scram
# 49888
|
2014-03-11 | 2014-03-11 | 1 | 5d | - | - |
|
Scram
# 49868
|
2014-03-04 | 2014-03-06 | 3 | 87d | - | - |
|
Scram
# 49593
|
2013-12-03 | 2013-12-07 | 5 | 380d | - | - |
|
Unscheduled
|
2012-11-15 | 2012-11-18 | 4 | 124d | - | - |
|
Scram
# 48097
|
2012-07-12 | 2012-07-14 | 3 | 38d | - | - |
|
Scheduled
|
2012-04-09 | 2012-06-04 | 57 | 116d | 2012-04-08 | +1d |
|
Unscheduled
|
2011-12-10 | 2011-12-15 | 6 | 121d | - | - |
|
Unscheduled
|
2011-08-07 | 2011-08-11 | 5 | 462d | - | - |
|
Scheduled
|
2010-04-03 | 2010-05-02 | 30 | 84d | 2010-04-03 | 0d |
|
Unscheduled
|
2010-01-07 | 2010-01-09 | 3 | 418d | - | - |
|
Unscheduled
|
2008-11-13 | 2008-11-15 | 3 | 211d | - | - |
|
Scheduled
|
2008-03-22 | 2008-04-16 | 26 | 128d | 2008-03-18 | +4d |
|
Unscheduled
|
2007-11-04 | 2007-11-15 | 12 | 235d | - | - |
|
Unscheduled
|
2007-03-09 | 2007-03-14 | 6 | 331d | - | - |
|
Scheduled
|
2006-03-20 | 2006-04-12 | 24 | 10d | 2006-03-19 | +1d |
|
Unscheduled
|
2006-03-10 | 2006-03-10 | 1 | 685d | - | - |
|
Scheduled
|
2004-03-16 | 2004-04-24 | 40 | 212d | 2004-03-15 | +1d |
|
Unscheduled
|
2003-08-15 | 2003-08-17 | 3 | 13d | - | - |
|
Unscheduled
|
2003-07-25 | 2003-08-02 | 9 | 212d | - | - |
|
Unscheduled
|
2002-12-21 | 2002-12-25 | 5 | 3d | - | - |
|
Unscheduled
|
2002-12-17 | 2002-12-18 | 2 | 24d | - | - |
|
Unscheduled
|
2002-11-12 | 2002-11-23 | 12 | 211d | - | - |
|
Scheduled
|
2002-03-16 | 2002-04-15 | 31 | 89d | 2002-03-16 | 0d |
|
Unscheduled
|
2001-12-16 | 2001-12-17 | 2 | 11d | - | - |
|
Unscheduled
|
2001-12-03 | 2001-12-05 | 3 | 46d | - | - |
|
Unscheduled
|
2001-10-16 | 2001-10-18 | 3 | 80d | - | - |
|
Unscheduled
|
2001-07-22 | 2001-07-28 | 7 | 65d | - | - |
|
Unscheduled
|
2001-05-17 | 2001-05-18 | 2 | 7d | - | - |
|
Unscheduled
|
2001-05-05 | 2001-05-10 | 6 | 64d | - | - |
|
Unscheduled
|
2001-02-26 | 2001-03-02 | 5 | 114d | - | - |
|
Unscheduled
|
2000-10-30 | 2000-11-04 | 6 | 41d | - | - |
|
Unscheduled
|
2000-09-18 | 2000-09-19 | 2 | 3d | - | - |
|
Unscheduled
|
2000-09-10 | 2000-09-15 | 6 | 145d | - | - |
|
Scheduled
|
2000-03-04 | 2000-04-18 | 46 | 226d | 2000-03-04 | 0d |
|
Unscheduled
|
1999-07-03 | 1999-07-22 | 20 | 3d | - | - |
|
Unscheduled
|
1999-06-25 | 1999-06-30 | 6 | 54d | - | - |
|
Unscheduled
|
1999-04-24 | 1999-05-02 | 9 | - | - | - |
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