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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
#79 of 94 ↓16
Bottom Quartile
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Days of continuous operation since the last outage ended. Clean run (no forced outages since last refueling).
68
Current Run
days ✔
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Longest recorded period of continuous operation between outages (2016-11-09 to 2018-04-13).
520
Record Run
days
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Breaker-to-Breaker runs — continuous operation exceeding the cycle-adjusted threshold (455 days for this 18-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).
88.7%
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.
5.7
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.
97.7%
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
32/100
Bottom Quartile · #79/94
5-year window
Hope Creek 1 ranks #79 of 94 active US units on NukeWorker's Operational Excellence Score over the 5-year window. Strongest area: Scrams (5-year) (48th percentile). Weakest: Forced Outage Days/yr (17th percentile).
Reliability
31
Capacity factor + Forced outages + B2B streaks
Efficiency
26
Fuel utilization + Refuel duration
Discipline
38
Startup duration + Scram count
Cohort Rankings
apples-to-apples comparison within each peer group
Reactor type:
#24 of 31
BWR
Containment:
#16 of 19
Mark I (BWR)
Cycle length:
#46 of 54
18-month cycle
Fleet rank above (79 of 94) compares all active US units; cohort ranks compare only against units sharing this property.
Per-dimension breakdown (7 metrics)
Capacity Factor
29th
88.4% (higher better, Reliability)
Forced Outage Days/yr
17th
9.0d (lower better, Reliability)
B2B Avg Streak
46th
513d (higher better, Reliability)
Fuel Utilization
18th
95.8% (higher better, Efficiency)
Refuel Duration
35th
35d (lower better, Efficiency)
Startup Duration
29th
5.7d (lower better, Discipline)
Scrams (5-year)
48th
0.4/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:
↓ -9.2 pts vs 2025
Compare Hope Creek 1 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 Nov 3, 2025
65.3% remaining
190 / 501 days
16.1 FPD margin
Avg refuel: 3.6%
Avg refuel (3yr): 2.3%
Deepest burn: 0.0% (2006-05 → 2007-10)
Most margin: 21.9% (2005-01 → 2006-04)
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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
# 58168
|
2026-02-23 | 2026-03-07 | 13 | 115d | - | - |
|
Scheduled
|
2025-09-26 | 2025-10-31 | 36 | 503d | 2025-10-02 | -6d |
|
Scheduled
|
2024-04-04 | 2024-05-11 | 38 | 84d | 2024-04-05 | -1d |
|
Unscheduled
|
2024-01-10 | 2024-01-11 | 2 | 14d | - | - |
|
Unscheduled
|
2023-12-27 | 2023-12-27 | 1 | 11d | - | - |
|
Scram
# 56889
|
2023-12-15 | 2023-12-16 | 2 | 52d | - | - |
|
Unscheduled
|
2023-10-22 | 2023-10-24 | 3 | 170d | - | - |
|
Unscheduled
|
2023-05-01 | 2023-05-05 | 5 | 183d | - | - |
|
Scheduled
|
2022-09-29 | 2022-10-30 | 32 | 107d | 2022-09-28 | +1d |
|
Unscheduled
|
2022-06-10 | 2022-06-14 | 5 | 322d | - | - |
|
Unscheduled
|
2021-07-22 | 2021-07-23 | 2 | 22d | - | - |
|
Unscheduled
|
2021-06-27 | 2021-06-30 | 4 | 31d | - | - |
|
Unscheduled
|
2021-05-25 | 2021-05-27 | 3 | 11d | - | - |
|
Scheduled
|
2021-04-22 | 2021-05-14 | 23 | 519d | 2021-04-08 | +14d |
|
Scheduled
|
2019-10-17 | 2019-11-20 | 35 | 73d | 2019-10-05 | +12d |
|
Scram
# 54198
|
2019-08-04 | 2019-08-05 | 2 | 126d | - | - |
|
Unscheduled
|
2019-03-29 | 2019-03-31 | 3 | 324d | - | - |
|
Scheduled
|
2018-04-13 | 2018-05-09 | 27 | 520d | 2018-04-15 | -2d |
|
Scheduled
|
2016-10-15 | 2016-11-09 | 26 | 381d | 2016-10-14 | +1d |
|
Scram
# 51430
|
2015-09-29 | 2015-09-30 | 2 | 143d | - | - |
|
Scheduled
|
2015-04-11 | 2015-05-09 | 29 | 213d | 2015-04-10 | +1d |
|
Unscheduled
|
2014-09-06 | 2014-09-10 | 5 | 272d | - | - |
|
Scram
# 49608
|
2013-12-05 | 2013-12-08 | 4 | 2d | - | - |
|
Scram
# 49608
|
2013-12-02 | 2013-12-03 | 2 | 24d | - | - |
|
Scheduled
|
2013-10-12 | 2013-11-08 | 28 | 117d | 2013-10-11 | +1d |
|
Scram
# 49108
|
2013-06-13 | 2013-06-17 | 5 | 401d | - | - |
|
Scheduled
|
2012-04-14 | 2012-05-08 | 25 | 391d | 2012-04-22 | -8d |
|
Unscheduled
|
2011-03-19 | 2011-03-20 | 2 | 130d | - | - |
|
Scheduled
|
2010-10-16 | 2010-11-09 | 25 | 271d | 2010-10-05 | +11d |
|
Unscheduled
|
2010-01-16 | 2010-01-18 | 3 | 243d | - | - |
|
Unscheduled
|
2009-05-17 | 2009-05-18 | 2 | 15d | - | - |
|
Scheduled
|
2009-04-11 | 2009-05-02 | 22 | 83d | 2009-04-10 | +1d |
|
Unscheduled
|
2009-01-18 | 2009-01-18 | 1 | 436d | - | - |
|
Scheduled
|
2007-10-14 | 2007-11-09 | 27 | 137d | 2007-10-12 | +2d |
|
Unscheduled
|
2007-05-30 | 2007-05-30 | 1 | 120d | - | - |
|
Unscheduled
|
2007-01-27 | 2007-01-30 | 4 | 270d | - | - |
|
Scheduled
|
2006-04-07 | 2006-05-02 | 26 | 215d | 2006-04-06 | +1d |
|
Unscheduled
|
2005-09-03 | 2005-09-04 | 2 | 2d | - | - |
|
Unscheduled
|
2005-08-29 | 2005-09-01 | 4 | 75d | - | - |
|
Unscheduled
|
2005-06-15 | 2005-06-15 | 1 | 2d | - | - |
|
Unscheduled
|
2005-06-08 | 2005-06-13 | 6 | 61d | - | - |
|
Unscheduled
|
2005-03-28 | 2005-04-08 | 12 | 69d | - | - |
|
Scheduled
SGR/Major
|
2004-10-11 | 2005-01-18 | 100 | 186d | 2004-10-10 | +1d |
|
Unscheduled
|
2004-03-21 | 2004-04-08 | 19 | 66d | - | - |
|
Unscheduled
|
2004-01-12 | 2004-01-15 | 4 | 27d | - | - |
|
Unscheduled
|
2003-12-06 | 2003-12-16 | 11 | 60d | - | - |
|
Unscheduled
|
2003-10-05 | 2003-10-07 | 3 | 8d | - | - |
|
Unscheduled
|
2003-09-20 | 2003-09-27 | 8 | 131d | - | - |
|
Scheduled
|
2003-04-16 | 2003-05-12 | 27 | 27d | 2003-04-16 | 0d |
|
Unscheduled
|
2003-03-19 | 2003-03-20 | 2 | 6d | - | - |
|
Unscheduled
|
2003-03-08 | 2003-03-13 | 6 | 256d | - | - |
|
Unscheduled
|
2002-06-23 | 2002-06-25 | 3 | 195d | - | - |
|
Unscheduled
|
2001-12-07 | 2001-12-10 | 4 | 34d | - | - |
|
Scheduled
|
2001-10-10 | 2001-11-03 | 25 | 148d | 2001-10-10 | 0d |
|
Unscheduled
|
2001-05-09 | 2001-05-15 | 7 | 327d | - | - |
|
Unscheduled
|
2000-06-02 | 2000-06-16 | 15 | 11d | - | - |
|
Scheduled
|
2000-04-22 | 2000-05-22 | 31 | 235d | 2000-06-02 | -41d |
|
Unscheduled
|
1999-08-28 | 1999-08-31 | 4 | 151d | - | - |
|
Unscheduled
|
1999-02-13 | 1999-03-30 | 46 | - | - | - |
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