Vogtle 3 - Status & History

Comprehensive reactor performance metrics, cycle analysis, and historical outage data.
Data refreshed 37 min ago Rx Status: Aug 4, 2026 at 5:21 AM (M-F)

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Reactor Status Timeline

Online NRC data, Mon to Fri ? Actual daily reactor status from NRC reports (Mon to Fri) and the current state. What is coming -- the utility's published Scheduled outage and NukeWorker's model Projection -- is part of a subscription. Colored by status. How far ahead you can see depends on your plan.
Sep2025OctNovDecJan2026FebMarAprMayJunJulAugOnline: Aug 4, 2025 to Apr 18, 2026Refueling Outage (3R02): Apr 19, 2026 to May 16, 2026Power Ascension: May 17, 2026 to May 22, 2026Online: May 23, 2026Power Ascension: May 24, 2026Online: May 25, 2026 to Jun 30, 2026Reduced Power: Jul 1, 2026Online: Jul 2, 2026 to Aug 4, 2026Today
OnlineReduced PowerPower AscensionRefueling Outage
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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.
6
Excellence
#93 of 93
Bottom Quartile
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Days of continuous operation since the last outage ended (Started 2026-05-16). Clean run (no forced outages since last refueling).
80
Current Run
days ✔
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Longest recorded period of continuous operation between outages (2025-05-30 to 2026-04-19).
324
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.
0
B2B Runs
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Lifetime capacity factor: average power level across all recorded days (100% = always at full power).
73.4%
Capacity Factor
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Net electricity actually generated over the most recent 12 months reported by the U.S. EIA (Form EIA-923), summed across every unit at this plant. Authoritative actuals, not an estimate.
36.87 TWh
Net Generation
EIA-923 · 12 mo to 2026-04 · plant total
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Total number of scheduled refueling outages detected in the historical data.
2
Outages
since 2022
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Average time from first power generation (>0%) to sustained full power (≥95% for 2+ days) across the last 2 scheduled outages. Click to compare against the fleet on the Operator Efficiency Leaderboard.
6
Avg Startup
days (last 2)
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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.
97.9%
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
6/100
Bottom Quartile · #93/93
5-year window

Vogtle 3 ranks #93 of 93 active US units on NukeWorker's Operational Excellence Score over the 5-year window. Strongest area: Refuel Duration (12th percentile). Weakest: Forced Outage Days/yr (1th percentile).

Reliability
4
Capacity factor + Forced outages + B2B streaks
Efficiency
12
Fuel utilization + Refuel duration
Discipline
1
Startup duration + Scram count
Cohort Rankings apples-to-apples comparison within each peer group
Reactor type: #1 of 1 AP1000
Containment: #47 of 47 Dry Ambient (PWR)
Cycle length: #53 of 53 18-month cycle
Fleet rank above (93 of 93) compares all active US units; cohort ranks compare only against units sharing this property.
Per-dimension breakdown (7 metrics)
Capacity Factor 7th
62.9% (higher better, Reliability)
Forced Outage Days/yr 1th
49.2d (lower better, Reliability)
Refuel Duration 12th
43d (lower better, Efficiency)
Scrams (5-year) 1th
1.4/yr (lower better, Discipline)

Each dimension's percentile is computed across the active US fleet (93 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 93 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: 2024: 7/100 (#93/93)2025: 5/100 (#93/93)2026: 25/100 (#86/93)
Compare Vogtle 3 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

Vogtle 3 has 15 outages plotted here, averaging 21 days each. The most recent, in Apr 2026, was a scheduled refueling outage lasting 28 days.
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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

After a refueling outage, Vogtle 3 takes about 6 days to climb from first power back to full power. That average is drawn from 2 startups on record, and the most recent took 8 days.
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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 May 18, 2026

85.0% remaining 78 / 507 days 2.0 FPD margin
Vogtle 3 is 78 days into its current fuel cycle with an estimated 85.0% of its fuel left. This cycle is set up to run about 507 days. Across its last 1 cycle, it has refueled with an average of 2.1% remaining.
Avg refuel: 2.1% Avg refuel (3yr): 2.1% Deepest burn: 2.1% (2024-11 → 2026-04) Most margin: 2.1% (2024-11 → 2026-04)
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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

Over its operating life, Vogtle 3 has run at about 73.4% of its rated capacity. Across the last 12 reported months it averaged 91.4%. On the chart, flat stretches near the top are full-power running and drops to zero are outages.
This table logs every recorded outage for Vogtle 3, 15 in all since 2022. Of those, 2 were scheduled refueling outages and 13 were unplanned or forced. The typical outage lasted about 21 days. Where the Scheduled column shows (Model), the date is a NukeWorker projection because the utility had not published one.
Type ⇅ Actual Start ⇅ Actual End ⇅ Duration ⇅ Days Online ⇅ Scheduled Delta
Scheduled 3R02
2026-04-19 2026-05-16 28 324d 2026-04-19 0d
Unscheduled
2025-05-23 2025-05-30 8 179d - -
Scheduled 3R01
2024-10-13 2024-11-25 44 17d 2024-10-13 0d
Scram # 57326
2024-09-17 2024-09-26 10 63d - -
Scram # 57215
2024-07-09 2024-07-16 8 159d - -
Unscheduled
2024-01-28 2024-02-01 5 187d - -
Scram # 56632
2023-07-22 2023-07-25 4 4d - -
Unscheduled
2023-07-16 2023-07-18 3 2d - -
Scram # 56614
2023-07-10 2023-07-14 5 4d - -
Unscheduled
2023-06-11 2023-07-06 26 4d - -
Unscheduled
2023-06-07 2023-06-07 1 22d - -
Scram # 56497
2023-05-02 2023-05-16 15 17d - -
Scram # 56460
2023-04-09 2023-04-15 7 20d - -
Scram # 56414
2023-03-16 2023-03-20 5 8d - -
Unscheduled
2022-10-13 2023-03-08 147 - - -
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