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All
PWR
BWR
Operating
+ D&D
Scheduled refueling outages only. Extended forced outages (>180 days) and decommissioned plant periods are excluded by default.
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Number of scheduled refueling outages that started in the current calendar year (filtered).
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Outages This Year
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Fleet-wide average duration of scheduled refueling outages in days. When a plant is selected, shows quartile rank vs fleet (shorter = better).
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Avg Duration
Days
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Spring (Jan-Jun) vs Fall (Jul-Dec) outage counts with percentages.
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Spring / Fall
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The single busiest outage season on record — the most outages started in one half of a year.
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Record Season
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Total number of unique scheduled refueling outages tracked since 2000 (filtered).
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Total Outages
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Average number of scheduled outages per year across the filtered time range.
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Avg Per Year
NukeWorker has tracked 1,564 scheduled refueling outages across the US fleet from 2000 to today, averaging 37 days each and about 57.9 a year. Refueling splits between spring and fall, 902 in spring and 662 in fall. The busiest single season on record was Spring 2011 with 43 outages.
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Stacked bar chart showing scheduled refueling outages by season (Spring: Jan-Jun, Fall: Jul-Dec) for each year. Use filters above to narrow by plant, region, type, or owner.
Outages by Season
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Overall breakdown of outages between Spring (Jan-Jun) and Fall (Jul-Dec) seasons for the filtered dataset.
Seasonal Split
Refueling splits roughly 58% spring and 42% fall. Utilities cluster outages into these shoulder seasons to keep reactors running through peak summer and winter demand.
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Average outage duration in days by year, split by season. Shows how refueling outage execution times have trended over the fleet's history.
Average Outage Duration by Year
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Top 15 plants ranked by total outage count. Toggle between most and fewest outages, normalize per GW of capacity, or aggregate by utility owner. Click a bar to view that plant's detail page.
Fewest Outages — Top 15
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Distribution of outage durations in 30-day buckets. Shows how many outages complete quickly (0-30 days) vs extend into long durations (120+ days).
Duration Distribution
Most refueling outages land in the 30 to 60 day range, 838 of the 1,564 on record.
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Top 15 plants ranked by average outage duration in days. Toggle to see longest or shortest performers, or aggregate by owner. Click a bar to view that plant's detail page.
Longest Avg Duration — Top 15
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Fleet-wide average outage duration per year with a linear trend line. Shows whether the industry is getting better or worse at outage execution over time. The dashed line indicates the overall direction.
Fleet Duration Trend — Year over Year
Outage execution has held steady over the years: scheduled outages averaged about 37 days in the early part of the record and 36 days in recent years.
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Grouped bar chart comparing spring vs fall outage counts per plant. Identifies plants that consistently schedule more outages in one season. Click a bar to view that plant's detail page.
Spring vs Fall by Plant — Top 15
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Top 15 plants ranked by how many days have elapsed since their most recent outage started. Longer streaks indicate plants on extended fuel cycles or those that haven't had a recent refueling.
Longest Active Streak
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Average months between successive outages for each plant. Plants on 18-month fuel cycles will show ~18, while 24-month cycle plants show ~24. Helps identify refueling cycle patterns.
Avg Months Between Outages
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Detailed yearly breakdown of outage counts and average durations by season. Heatmap coloring indicates relative activity. Click any row to view that year's full outage schedule.
Detailed History
This table breaks every year from 2000 to 2026 down by season, with outage counts and average durations. Click a year to open its full schedule, or export the set.
| Year | Spring | Avg Days | Fall | Avg Days | Total | Activity |
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