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Sequoyah 1 - Status & History

Comprehensive reactor performance metrics, cycle analysis, and historical outage data.

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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

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Days between consecutive scheduled refueling outage starts, showing operating cycle regularity. The purple dashed line marks the average cycle length. Most U.S. reactors operate on 18-month (547 day) or 24-month (730 day) cycles.

Cycle Length History

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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

Scheduled
2025-10-04 2025-12-01 59 100d 2025-10-03 +1d
Scram # 57778
2025-06-24 2025-06-26 3 248d - -
Scram # 57351
2024-09-30 2024-10-19 20 30d - -
Scram # 57285
2024-08-24 2024-08-31 8 116d - -
Scheduled
2024-03-23 2024-04-30 39 486d 2024-03-29 -6d
Scheduled
2022-10-22 2022-11-23 33 440d 2022-10-22 0d
Unscheduled
2021-08-06 2021-08-08 3 69d - -
Scram # 55272
2021-05-25 2021-05-29 5 15d - -
Scheduled
2021-04-10 2021-05-10 31 331d 2021-04-10 0d
Scram # 54708
2020-05-13 2020-05-14 2 169d - -
Scheduled
2019-10-12 2019-11-26 46 45d 2019-09-29 +13d
Scram # 54242
2019-08-27 2019-08-28 2 133d - -
Scram # 53999
2019-04-14 2019-04-16 3 122d - -
Unscheduled
2018-12-10 2018-12-13 4 218d - -
Scheduled
2018-04-07 2018-05-06 30 180d 2018-04-07 0d
Unscheduled
2017-10-02 2017-10-09 8 275d - -
Scheduled
2016-11-26 2016-12-31 36 286d 2016-11-05 +21d
Unscheduled
2015-12-27 2016-02-14 50 33d - -
Scram # 51559
2015-11-24 2015-11-24 1 66d - -
Scram # 51392
2015-09-14 2015-09-19 6 31d - -
Unscheduled
2015-08-09 2015-08-14 6 9d - -
Unscheduled
2015-07-31 2015-07-31 1 2d - -
Scram # 51265
2015-07-28 2015-07-29 2 2d - -
Scram # 51265
2015-07-25 2015-07-26 2 71d - -
Scheduled
2015-04-11 2015-05-15 35 28d 2015-04-13 -2d
Scram # 50878
2015-03-12 2015-03-14 3 477d - -
Scheduled
2013-10-14 2013-11-20 38 563d 2013-10-14 0d
Scheduled
2012-02-27 2012-03-30 33 191d 2012-02-27 0d
Scram # 47169
2011-08-19 2011-08-20 2 29d - -
Scram # 47081
2011-07-21 2011-07-21 1 24d - -
Scram # 46991
2011-06-27 2011-06-27 1 186d - -
Unscheduled
2010-12-20 2010-12-23 4 33d - -
Unscheduled
2010-11-17 2010-11-17 1 2d - -
Scheduled
2010-10-02 2010-11-15 45 512d 2010-10-01 +1d
Unscheduled
2009-05-07 2009-05-08 2 7d - -
Unscheduled
2009-04-29 2009-04-30 2 2d - -
Scheduled
2009-03-27 2009-04-27 32 434d 2009-03-29 -2d
Unscheduled
2008-01-17 2008-01-18 2 63d - -
Scheduled
2007-10-04 2007-11-15 43 508d 2007-09-30 +4d
Scheduled
2006-04-10 2006-05-14 35 364d 2006-04-09 +1d
Unscheduled
2005-04-10 2005-04-11 2 142d - -
Scheduled
2004-10-25 2004-11-19 26 220d 2004-10-25 0d
Unscheduled
2004-03-15 2004-03-19 5 197d - -
Unscheduled
2003-08-29 2003-08-31 3 76d - -
Scheduled
2003-03-17 2003-06-14 90 481d 2003-03-17 0d
Scheduled
2001-10-22 2001-11-21 31 343d 2001-10-22 0d
Unscheduled
2000-10-07 2000-11-13 38 2d - -
Unscheduled
2000-09-26 2000-10-05 10 189d - -
Unscheduled
2000-03-21 2000-03-21 1 4d - -
Scheduled
2000-02-23 2000-03-17 24 - 2000-02-23 0d
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