Sequoyah 2

Refueling Outage · Day 21

Tennessee Valley Authority·Soddy-Daisy, TN·PWR·1,126 MWe

Data refreshed 11.2h ago Rx Status: Oct 23, 2026 at 5:36 AM (M-F)

Outage History Daily Power Log Get alerts

Reactor Status Timeline

Refueling Outage · Day 21 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.
Nov2025DecJan2026FebMarAprMayJunJulAugSepOctNovOnline: Oct 23, 2025 to Nov 1, 2025Forced Outage: Nov 2, 2025 to Nov 8, 2025Power Ascension: Nov 9, 2025Online: Nov 10, 2025 to Sep 30, 2026Coastdown: Oct 1, 2026 to Oct 2, 2026Refueling Outage (U2R27): Oct 3, 2026 to Oct 23, 2026U2R27Today
OnlineCoastdownPower 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 2026-10-23). 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 (2000-11-14 to 2002-04-15).
517
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.
4
B2B Runs
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Lifetime capacity factor: average power level across all recorded days (100% = always at full power).
88.3%
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.
17.88 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.
18
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.
17
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.
93.0%
Fuel Utilization
3yr avg

Reactor Status

Current Reactor Status Oct 23, 2026

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Current power output from NRC daily reactor status reports, updated Monday through Friday, except federal holidays. The gauge shows power level as a percentage of rated capacity. The sparkline shows the last 14 days of power history. Click to view the full unit dashboard.
Sequoyah 2 is OFFLINE (14 Days) at 0% of rated power as of Oct 23, 2026. This outage is RFO U2R27. Over the last 14 reported days it has run between 0% and 0% power.
Sequoyah 2 is OFFLINE (14 Days) Get alerts
0
PERCENT
0 200 400 600 800 1000 1,126 RATED CAPACITY (1,126 MWe) 0 MWe
Current:
0 MWe
Powering 0 homes
Rated Capacity:
1,126 MWe
900,800 homes
14-Day Power History
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Oct 10 Oct 23

Capacity Factor (365-Day)

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0%
Current
92.1%
365-Day Avg
#12
of 94 plants
Min: 0% Max: 100% 29 days <80%

Outage Days by Year

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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, Sequoyah 2 has spent 587 days in scheduled refueling outages and 138 days in forced or unplanned outages. Taller bars mark the years with the most downtime.
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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

Sequoyah 2 has 49 outages plotted here, averaging 15 days each. The most recent, in Oct 2026, was a scheduled refueling outage lasting 21 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

Sequoyah 2 has completed 18 scheduled refueling outages on record, averaging 33 days each. The most recent, in Oct 2026, ran 21 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, Sequoyah 2 takes about 5 days to climb from first power back to full power. That average is drawn from 18 startups on record, and the most recent took 43 days.
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Daily reactor power over the 120 days before each scheduled refueling outage, one line per refueling, lined up on the day the outage began. A coastdown is the slow decline as the fuel runs out near the end of a cycle. The highlighted line is the most recent refueling and fainter lines are older. Counts and medians cover coastdowns of a week or longer. A shutdown straight from full power, with no decline ahead of it, is what a forced outage looks like.

Coastdown Before Refueling

13 of 19 refuelings 25 days median 80% power at shutdown 0.7% per day
Sequoyah 2 coasted down for a week or longer before 13 of its 19 refuelings on record. Those coastdowns ran a median of 25 days and ended near 80% power. The most recent refueling, in Oct 2026, began with no extended coastdown.
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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, Sequoyah 2 has run at about 88.3% of its rated capacity. Across the last 12 reported months it averaged 90.2%. 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 Sequoyah 2, 50 in all since 1999. Of those, 19 were scheduled refueling outages and 31 were unplanned or forced. The typical outage lasted about 20 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 U2R27
2026-10-03 In Outage 21+ 329d 2026-10-02 +1d
Unscheduled
2025-11-02 2025-11-08 7 128d - -
Scram # 57779 Manual
2025-06-24 2025-06-27 4 5d - -
Unscheduled
2025-05-30 2025-06-19 21 6d - -
Unscheduled
2025-05-20 2025-05-24 5 3d - -
Scheduled # 57253 Auto U2R26SGR/Major
2024-07-31 2025-05-17 291 4d 2024-08-07 -7d
Unscheduled
2024-07-21 2024-07-27 7 465d - -
Scheduled U2R25
2023-03-18 2023-04-13 27 496d 2023-03-18 0d
Scheduled U2R24
2021-10-02 2021-11-07 37 516d 2021-10-21 -19d
Scheduled U2R23
2020-04-11 2020-05-04 24 120d 2020-04-18 -7d
Scram # 54438 Manual
2019-12-13 2019-12-13 1 371d - -
Scheduled U2R22
2018-11-03 2018-12-07 35 516d 2018-09-29 +35d
Unscheduled
2017-06-05 2017-06-05 1 2d - -
Unscheduled
2017-06-03 2017-06-03 1 4d - -
Scheduled U2R21
2017-04-28 2017-05-30 33 355d 2017-04-22 +6d
Unscheduled
2016-05-07 2016-05-08 2 146d - -
Scheduled U2R20
2015-11-14 2015-12-13 30 253d 2015-11-16 -2d
Scram # 50856 Auto
2015-03-03 2015-03-06 4 263d - -
Scheduled U2R19
2014-05-12 2014-06-13 33 440d 2014-05-12 0d
Scram # 48778 Manual
2013-02-25 2013-02-26 2 54d - -
Scheduled U2R18SGR/Major
2012-10-15 2013-01-02 80 58d 2012-10-15 0d
Scram # 48198 Auto
2012-08-17 2012-08-18 2 422d - -
Scheduled U2R17
2011-05-23 2011-06-22 31 352d 2011-04-24 +29d
Unscheduled
2010-05-29 2010-06-05 8 184d - -
Unscheduled
2009-11-26 2009-11-26 1 2d - -
Scheduled U2R16
2009-10-26 2009-11-24 30 149d 2009-10-25 +1d
Unscheduled
2009-05-28 2009-05-30 3 61d - -
Unscheduled
2009-03-27 2009-03-28 2 135d - -
Unscheduled
2008-11-04 2008-11-12 9 64d - -
Unscheduled
2008-09-01 2008-09-01 1 89d - -
Scheduled U2R15
2008-05-05 2008-06-04 31 418d 2008-04-27 +8d
Unscheduled
2007-03-14 2007-03-14 1 49d - -
Unscheduled
2007-01-24 2007-01-24 1 30d - -
Scheduled U2R14
2006-11-27 2006-12-25 29 247d 2006-11-26 +1d
Unscheduled
2006-03-23 2006-03-25 3 300d - -
Scheduled U2R13
2005-04-25 2005-05-27 33 59d 2005-04-24 +1d
Unscheduled
2005-02-24 2005-02-25 2 396d - -
Unscheduled
2004-01-16 2004-01-25 10 9d - -
Unscheduled
2003-12-28 2004-01-07 11 18d - -
Scheduled U2R12
2003-11-10 2003-12-10 31 211d 2003-11-10 0d
Unscheduled
2003-04-13 2003-04-13 1 15d - -
Unscheduled
2003-03-25 2003-03-29 5 9d - -
Unscheduled
2003-03-11 2003-03-16 6 64d - -
Unscheduled
2002-12-27 2003-01-06 11 166d - -
Unscheduled
2002-07-13 2002-07-14 2 42d - -
Unscheduled
2002-05-31 2002-06-01 2 11d - -
Scheduled U2R11
2002-04-15 2002-05-20 36 517d 2002-04-15 0d
Scheduled U2R10
2000-10-23 2000-11-14 23 277d 2000-10-23 0d
Unscheduled
2000-01-19 2000-01-20 2 254d - -
Scheduled U2R9
1999-04-18 1999-05-10 23 - 1999-04-18 0d
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