FitzPatrick - Status & History

Comprehensive reactor performance metrics, cycle analysis, and historical outage data.

Plant Info Outage History Daily Power Log
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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.
71
Excellence
#18 of 94 →
Top Quartile
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Days of continuous operation since the last outage ended. Clean run (no forced outages since last refueling).
597
Current Run
days ✔
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Longest recorded period of continuous operation between outages (2020-10-04 to 2022-09-26).
722
Record Run
days
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Breaker-to-Breaker runs — continuous operation exceeding the cycle-adjusted threshold (628 days for this 24-month cycle unit) with no trips to 0% power.
4
B2B Runs
94% toward B2B (589/628d)
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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.
13
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.
2
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.
93.7%
Fuel Utilization
lifetime 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.
Time window — change how far back we look
NukeWorker's
Operational
Excellence Score
71/100
Top Quartile · #18/94
5-year window

FitzPatrick ranks #18 of 94 active US units on NukeWorker's Operational Excellence Score over the 5-year window. Strongest area: Capacity Factor (98th percentile). Weakest: Fuel Utilization (40th percentile).

Reliability
94
Capacity factor + Forced outages + B2B streaks
Efficiency
64
Fuel utilization + Refuel duration
Discipline
56
Startup duration + Scram count
Cohort Rankings apples-to-apples comparison within each peer group
Reactor type: #9 of 31 BWR
Containment: #5 of 19 Mark I (BWR)
Cycle length: #12 of 40 24-month cycle
Fleet rank above (18 of 94) compares all active US units; cohort ranks compare only against units sharing this property.
Per-dimension breakdown (7 metrics)
Capacity Factor 98th
97.0% (higher better, Reliability)
Forced Outage Days/yr 95th
0.6d (lower better, Reliability)
B2B Avg Streak 88th
703d (higher better, Reliability)
Fuel Utilization 40th
97.6% (higher better, Efficiency)
Refuel Duration 88th
20d (lower better, Efficiency)
Startup Duration 63th
3.9d (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: 2021: 68/100 (#24/93)2022: 68/100 (#21/92)2023: 72/100 (#16/92)2024: 66/100 (#20/93)2025: 76/100 (#16/94)2026: 77/100 (#15/94) Stable vs 2025
Compare FitzPatrick 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 Sep 18, 2024

15.2% remaining 602 / 706 days 3.2 FPD margin
Avg refuel: 6.3% Deepest burn: 0.0% (2014-10 → 2017-01) Most margin: 23.5% (2017-02 → 2018-09)
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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 # 57333
2024-09-24 2024-09-24 1 7d - -
Scheduled
2024-09-04 2024-09-17 14 689d 2024-09-05 -1d
Scheduled
2022-09-26 2022-10-16 21 722d 2022-09-26 0d
Scheduled
2020-09-14 2020-10-04 21 220d 2020-09-14 0d
Scram # 54503
2020-02-01 2020-02-07 7 482d - -
Scheduled
2018-09-11 2018-10-07 27 565d 2018-09-10 +1d
Scheduled
2017-01-15 2017-02-23 40 193d 2017-01-14 +1d
Scram # 52042
2016-06-25 2016-07-06 12 148d - -
Scram # 51680
2016-01-24 2016-01-29 6 474d - -
Scheduled
2014-08-25 2014-10-07 44 83d 2014-09-14 -20d
Unscheduled
2014-06-02 2014-06-03 2 453d - -
Unscheduled
2013-03-04 2013-03-06 3 100d - -
Scram # 48501
2012-11-11 2012-11-24 14 5d - -
Unscheduled
2012-11-05 2012-11-06 2 19d - -
Scheduled
2012-09-17 2012-10-17 31 702d 2012-09-16 +1d
Unscheduled
2010-10-15 2010-10-16 2 2d - -
Scheduled
2010-09-13 2010-10-13 31 704d 2010-09-12 +1d
Scheduled
2008-09-15 2008-10-09 25 162d 2008-09-13 +2d
Unscheduled
2008-04-06 2008-04-06 1 148d - -
Unscheduled
2007-11-06 2007-11-10 5 5d - -
Unscheduled
2007-10-28 2007-11-01 5 13d - -
Unscheduled
2007-10-15 2007-10-15 1 31d - -
Unscheduled
2007-09-13 2007-09-14 2 22d - -
Unscheduled
2007-08-21 2007-08-22 2 291d - -
Scheduled
2006-10-09 2006-11-03 26 389d 2006-10-08 +1d
Unscheduled
2005-09-14 2005-09-15 2 63d - -
Unscheduled
2005-07-01 2005-07-13 13 251d - -
Scheduled
2004-09-25 2004-10-23 29 51d 2004-09-24 +1d
Unscheduled
2004-08-05 2004-08-05 1 354d - -
Unscheduled
2003-08-15 2003-08-17 3 142d - -
Unscheduled
2003-03-26 2003-03-26 1 2d - -
Unscheduled
2003-03-20 2003-03-24 5 141d - -
Scheduled
2002-10-08 2002-10-30 23 104d 2002-10-08 0d
Unscheduled
2002-06-25 2002-06-26 2 452d - -
Unscheduled
2001-03-27 2001-03-30 4 135d - -
Scheduled
2000-10-08 2000-11-12 36 39d 2000-10-08 0d
Unscheduled
2000-08-28 2000-08-30 3 144d - -
Unscheduled
2000-04-02 2000-04-06 5 143d - -
Unscheduled
1999-11-06 1999-11-11 6 15d - -
Unscheduled
1999-10-15 1999-10-22 8 90d - -
Unscheduled
1999-07-15 1999-07-17 3 - - -
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