All
PWR
BWR
All
Auto
Manual
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Total confirmed reactor scrams (automatic + manual trips) reported to the NRC so far this calendar year. When a plant is selected, shows quartile rank vs fleet (fewer = better).
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Scrams This Year
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Average number of days for a reactor to return to 95% power after a scram event. When a plant is selected, shows quartile rank vs fleet (shorter = better).
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Avg Recovery
days to 95% power
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Year-end projection based on the current scram rate. Calculated as: (YTD scrams / days elapsed) × 365.
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Projected This Year
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Rolling count of scram events in the last 365 days, regardless of calendar year boundaries.
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Last 365 Days
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Automatic: Reactor Protection System triggered the trip automatically.
Manual: Operator initiated the trip manually (e.g., via manual scram switch).
Manual: Operator initiated the trip manually (e.g., via manual scram switch).
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Auto / Manual
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PWR (Pressurized Water Reactor): Uses pressurized water as coolant; ~65% of U.S. fleet.
BWR (Boiling Water Reactor): Water boils directly in the core; ~35% of fleet.
BWR (Boiling Water Reactor): Water boils directly in the core; ~35% of fleet.
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PWR / BWR
NukeWorker has logged 770 reactor scrams across the US fleet since 2011, including 10 so far in 2026. Of those, 459 were automatic trips and 311 were operator-initiated. Over the last five years, units have taken about 6 days on average to return to full power afterward.
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Interactive map showing the geographic location of each scram event. Marker color indicates recency; border glow indicates automatic (green) vs manual (red) trip.
Scram Events by Location
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Month-by-month comparison of scram counts for the current year and two prior years. Helps identify seasonal patterns and year-over-year trends.
Monthly Scram Trend — Last 3 Years
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Total scram events per calendar year across the U.S. fleet. The dashed red line shows the 5-year rolling average.
Annual Scram Totals
Fleet scrams peaked at 69 in 2013. Over the last five full years the fleet has averaged 41 scrams a year, and 2026 has 10 so far.
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Average scram count by calendar month across all years. Reveals whether certain months historically experience more scram events.
Seasonal Pattern (All Years)
Across the full record, scrams have been most frequent in May and least frequent in December.
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Stacked comparison of scram events by reactor type each year. PWR (~65% of fleet) vs BWR (~35%).
PWR vs BWR by Year
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Stacked comparison of automatic vs manual scram trips each year. Automatic = Reactor Protection System; manual = operator-initiated.
Auto vs Manual by Year
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Ranking of reactor units by total scram count. Toggle to show most/fewest scrams, normalize per GW of capacity, or aggregate by owner/operator.
Fewest Scrams — Top 15
These scram events span 103 reactor units. The most at any single unit over this period was 29; the default view highlights the units with the fewest.
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States ranked by total scram events. States with more reactors appear higher; compare with the per-GW plant view for size-normalized rankings.
Scrams by State — Top 15
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Average days for each plant to return to 95% power after a scram. Based on last 5 years. Shorter = faster post-trip restart capability.
Average Recovery Time by Plant (last 5 years)
Across the last five years, plants have returned to 95% power about 6 days after a scram, on average.
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Distribution of reactor power levels at the moment of each scram. Most occur at high power (90–100%); low-power trips may indicate different root causes.
Power Level at Time of Scram
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Searchable, sortable table of all scram events matching current filters. Includes date, plant, type, trip, power level, recovery time, and NRC event links.
Scram Event Log
| Date | Plant | Type | Trip | Power% | Recovery | Description | NRC |
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