Browns Ferry 1
Refueling Outage · Day 28Tennessee Valley Authority·Athens, AL·BWR·1,256 MWe
Reactor Status Timeline
Refueling Outage · Day 28 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.OnlineReduced PowerCoastdownPower AscensionRefueling OutageForced 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.
Excellence
Rank locked · 93 units
Subscribers
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Days of continuous operation since the last outage ended (Started 2026-10-09). Has forced outage(s) since last refueling.
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Current Run
offline
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Longest recorded period of continuous operation between outages (2018-11-20 to 2020-07-22).
610
Record Run
days
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Breaker-to-Breaker runs — continuous operation exceeding the cycle-adjusted threshold set for this 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).
63.2%
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.
30.98 TWh
Net Generation
EIA-923 · 12 mo to 2026-07 · plant total
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Total number of scheduled refueling outages detected in the historical data.
10
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.
15.3
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.
100.0%
Fuel Utilization
3yr avg
Reactor Status
Capacity Factor (365-Day)
0%
Current
89.9%
365-Day Avg
#46
of 94 plants
Min: 0%
Max: 100%
40 days <80%
Outage Days by Year
?Total days spent in outage each year, split by scheduled refueling (blue) and forced/unplanned (red). Lower totals indicate better reliability and outage execution. Hover for details.
Across its recorded history, Browns Ferry 1 has spent 322 days in scheduled refueling outages and 157 days in forced or unplanned outages. Taller bars mark the years with the most downtime.
Performance Trends
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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
Browns Ferry 1 has 38 outages plotted here, averaging 13 days each. The most recent, in Sep 2026, was a scheduled refueling outage lasting 28 days.
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Scheduled refueling outage durations over time. Green bars are at or below this unit's average, amber up to 30% above it, red beyond that. The dashed line is the average. Shorter outages mean better execution.
Refueling Duration Trend
Browns Ferry 1 has completed 10 scheduled refueling outages on record, averaging 32 days each. The most recent, in Sep 2026, ran 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, Browns Ferry 1 takes about 5 days to climb from first power back to full power. That average is drawn from 9 startups on record, and the most recent took 5 days.
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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, Browns Ferry 1 has run at about 63.2% of its rated capacity. Across the last 12 reported months it averaged 83.9%. On the chart, green stretches near the top are full-power running, amber marks reduced power (50 to 89%), and red drops toward zero are outages.
Outage History & Daily Power Log
This table logs every recorded outage for Browns Ferry 1, 39 in all since 1999. Of those, 10 were scheduled refueling outages, 1 was planned maintenance and 28 were unplanned or forced. The typical outage lasted about 91 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
U1R16
|
2026-09-12 | In Outage | 28+ | 142d | 2026-09-11 | +1d |
|
Unscheduled
|
2026-04-18 | 2026-04-23 | 6 | 258d | - | - |
| 2025-08-02 | 2025-08-03 | 2 | 72d | - | - | |
|
Unscheduled
|
2025-05-20 | 2025-05-22 | 3 | 235d | - | - |
|
Scheduled
U1R15
|
2024-08-31 | 2024-09-27 | 28 | 117d | 2024-08-30 | +1d |
| 2024-04-25 | 2024-05-06 | 12 | 86d | - | - | |
|
Unscheduled
|
2024-01-26 | 2024-01-30 | 5 | 249d | - | - |
| 2023-05-20 | 2023-05-22 | 3 | 108d | - | - | |
|
Unscheduled
|
2023-01-31 | 2023-02-01 | 2 | 97d | - | - |
|
Scheduled
U1R14
|
2022-10-01 | 2022-10-26 | 26 | 251d | 2022-10-01 | 0d |
|
Unscheduled
|
2022-01-15 | 2022-01-23 | 9 | 435d | - | - |
| 2020-11-06 | 2020-11-06 | 1 | 2d | - | - | |
|
Scheduled
U1R13
|
2020-10-03 | 2020-11-04 | 33 | 66d | 2020-10-03 | 0d |
| 2020-07-22 | 2020-07-29 | 8 | 610d | - | - | |
|
Scheduled
U1R12
|
2018-10-14 | 2018-11-20 | 38 | 207d | 2018-10-13 | +1d |
| 2018-03-19 | 2018-03-21 | 3 | 501d | - | - | |
|
Scheduled
U1R11
|
2016-10-01 | 2016-11-03 | 34 | 61d | 2016-10-01 | 0d |
|
Unscheduled
|
2016-07-27 | 2016-08-01 | 6 | 250d | - | - |
|
Unscheduled
|
2015-11-16 | 2015-11-20 | 5 | 199d | - | - |
| 2015-04-30 | 2015-05-01 | 2 | 183d | - | - | |
|
Scheduled
U1R10
|
2014-10-04 | 2014-10-29 | 26 | 35d | 2014-10-04 | 0d |
| 2014-08-27 | 2014-08-30 | 4 | 518d | - | - | |
| 2013-03-20 | 2013-03-27 | 8 | 110d | - | - | |
|
Scheduled
U1R9
|
2012-10-20 | 2012-11-30 | 42 | 312d | 2012-10-22 | -2d |
|
Unscheduled
|
2011-12-10 | 2011-12-13 | 4 | 205d | - | - |
| 2011-04-28 | 2011-05-19 | 22 | 156d | - | - | |
|
Scheduled
U1R8
|
2010-10-24 | 2010-11-23 | 31 | 590d | 2010-10-25 | -1d |
|
Unscheduled
|
2009-02-26 | 2009-03-13 | 16 | 2d | - | - |
|
Unscheduled
|
2009-02-19 | 2009-02-24 | 6 | 81d | - | - |
|
Scheduled
U1R7
|
2008-10-26 | 2008-11-30 | 36 | 74d | 2008-10-24 | +2d |
|
Unscheduled
|
2008-08-09 | 2008-08-13 | 5 | 271d | - | - |
|
Unscheduled
|
2007-11-04 | 2007-11-12 | 9 | 19d | - | - |
|
Unscheduled
|
2007-10-13 | 2007-10-16 | 4 | 40d | - | - |
|
Unscheduled
|
2007-09-03 | 2007-09-03 | 1 | 21d | - | - |
|
Unscheduled
|
2007-08-12 | 2007-08-13 | 2 | 47d | - | - |
|
Unscheduled
|
2007-06-24 | 2007-06-26 | 3 | 12d | - | - |
|
Unscheduled
|
2007-06-10 | 2007-06-12 | 3 | 15d | - | - |
|
Unscheduled
|
2007-05-24 | 2007-05-26 | 3 | 2d | - | - |
| 1999-01-01 | 2007-05-22 | 3064 | - | - | - |
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