McGuire 2 - 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.
54
Excellence
#36 of 94 ↓7
Mid Quartile
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Days of continuous operation since the last outage ended. Clean run (no forced outages since last refueling).
26
Current Run
days ✔
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Longest recorded period of continuous operation between outages (2011-04-04 to 2012-09-16).
531
Record Run
days
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Breaker-to-Breaker runs — continuous operation exceeding the cycle-adjusted threshold (460 days for this 18-month cycle unit) with no trips to 0% power.
12
B2B Runs
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Lifetime capacity factor: average power level across all recorded days (100% = always at full power).
91.6%
Capacity Factor
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Total number of scheduled refueling outages detected in the historical data.
19
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.
6
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.
99.6%
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.
Time window — change how far back we look
NukeWorker's
Operational
Excellence Score
54/100
Mid Quartile · #36/94
5-year window

McGuire 2 ranks #36 of 94 active US units on NukeWorker's Operational Excellence Score over the 5-year window. Strongest area: Fuel Utilization (66th percentile). Weakest: B2B Avg Streak (37th percentile).

Reliability
46
Capacity factor + Forced outages + B2B streaks
Efficiency
65
Fuel utilization + Refuel duration
Discipline
52
Startup duration + Scram count
Cohort Rankings apples-to-apples comparison within each peer group
Reactor type: #24 of 61 PWR
Containment: #4 of 10 Ice Condenser
Cycle length: #19 of 54 18-month cycle
Fleet rank above (36 of 94) compares all active US units; cohort ranks compare only against units sharing this property.
Per-dimension breakdown (7 metrics)
Capacity Factor 44th
90.3% (higher better, Reliability)
Forced Outage Days/yr 59th
2.8d (lower better, Reliability)
B2B Avg Streak 37th
508d (higher better, Reliability)
Fuel Utilization 66th
98.3% (higher better, Efficiency)
Refuel Duration 63th
29d (lower better, Efficiency)
Startup Duration 56th
4.1d (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: 69/100 (#23/93)2022: 67/100 (#24/92)2023: 64/100 (#26/92)2024: 63/100 (#23/93)2025: 55/100 (#29/94)2026: 53/100 (#36/94) ↓ -2.5 pts vs 2025
Compare McGuire 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 20, 2026

96.1% remaining 23 / 515 days 3.0 FPD margin
Avg refuel: 2.8% Avg refuel (3yr): 0.4% Deepest burn: 0.0% (2002-03 → 2003-09) Most margin: 8.8% (2012-11 → 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
2026-03-22 2026-04-18 28 157d 2026-03-21 +1d
Scram # 57977
2025-10-10 2025-10-16 7 384d - -
Scheduled
2024-09-01 2024-09-21 21 517d 2024-09-01 0d
Scheduled
2023-02-18 2023-04-03 45 362d 2023-02-18 0d
Scram # 55748
2022-02-19 2022-02-21 3 132d - -
Scheduled
2021-09-11 2021-10-10 30 516d 2021-09-11 0d
Scheduled
2020-03-21 2020-04-13 24 526d 2020-03-14 +7d
Scheduled
2018-09-15 2018-10-12 28 511d 2018-09-15 0d
Scheduled
2017-03-30 2017-04-22 24 22d 2017-03-30 0d
Unscheduled
2017-02-24 2017-03-08 13 504d - -
Scheduled
2015-09-13 2015-10-09 27 508d 2015-09-12 +1d
Scheduled
2014-03-22 2014-04-23 33 477d 2014-03-22 0d
Unscheduled
2012-11-28 2012-11-30 3 6d - -
Scheduled SGR/Major
2012-09-16 2012-11-22 68 531d 2012-09-15 +1d
Scheduled
2011-02-27 2011-04-04 37 33d 2011-03-05 -6d
Unscheduled
2011-01-21 2011-01-25 5 468d - -
Scheduled
2009-09-06 2009-10-10 35 508d 2009-09-05 +1d
Unscheduled
2008-04-14 2008-04-16 3 2d - -
Scheduled
2008-03-02 2008-04-12 42 479d 2008-03-01 +1d
Scheduled
2006-09-17 2006-11-09 54 515d 2006-09-16 +1d
Unscheduled
2005-04-18 2005-04-20 3 2d - -
Unscheduled
2005-04-15 2005-04-16 2 2d - -
Scheduled
2005-03-02 2005-04-13 43 514d 2005-03-01 +1d
Scheduled
2003-09-06 2003-10-05 30 378d 2003-09-06 0d
Unscheduled
2002-08-23 2002-08-24 2 150d - -
Scheduled
2002-02-23 2002-03-26 32 220d 2002-02-23 0d
Unscheduled
2001-07-17 2001-07-18 2 243d - -
Unscheduled
2000-11-16 2000-11-16 1 35d - -
Scheduled
2000-09-02 2000-10-12 41 414d 2000-09-02 0d
Unscheduled
1999-07-16 1999-07-16 1 93d - -
Scheduled
1999-03-13 1999-04-14 33 - 1999-03-13 0d
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