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Seabrook 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

Scram # 57432
2024-11-20 2024-11-20 1 11d - -
Scheduled
2024-10-05 2024-11-09 36 428d 2024-10-05 0d
Scram # 56645
2023-07-31 2023-08-04 5 84d - -
Scheduled
2023-04-01 2023-05-08 38 513d 2023-04-01 0d
Scheduled
2021-10-02 2021-11-04 34 479d 2021-10-01 +1d
Scram # 54740
2020-06-07 2020-06-10 4 7d - -
Scram # 54731
2020-05-29 2020-05-31 3 32d - -
Scheduled
2020-04-01 2020-04-27 27 522d 2020-04-01 0d
Scheduled
2018-10-01 2018-10-27 27 519d 2018-10-01 0d
Scheduled
2017-04-01 2017-04-30 30 391d 2017-04-01 0d
Scram # 51762
2016-03-02 2016-03-06 5 110d - -
Scheduled
2015-10-01 2015-11-13 44 526d 2015-10-01 0d
Scheduled
2014-04-01 2014-04-23 23 519d 2014-04-01 0d
Scheduled
2012-09-15 2012-10-29 45 324d 2012-09-17 -2d
Unscheduled
2011-10-20 2011-10-27 8 3d - -
Scram # 47327
2011-10-07 2011-10-17 11 138d - -
Scheduled
2011-04-01 2011-05-22 52 471d 2011-04-01 0d
Unscheduled
2009-12-07 2009-12-16 10 28d - -
Scheduled
2009-10-01 2009-11-09 40 512d 2009-10-01 0d
Scheduled
2008-04-01 2008-05-07 37 62d 2008-04-01 0d
Unscheduled
2008-01-20 2008-01-30 11 440d - -
Scheduled
2006-10-01 2006-11-06 37 28d 2006-09-30 +1d
Unscheduled
2006-09-01 2006-09-03 3 489d - -
Scheduled
2005-04-01 2005-04-30 30 9d 2005-03-31 +1d
Unscheduled
2005-03-23 2005-03-23 1 508d - -
Unscheduled
2003-11-01 2003-11-01 1 7d - -
Scheduled
2003-10-04 2003-10-25 22 492d 2003-10-04 0d
Scheduled
2002-05-04 2002-05-30 27 197d 2002-05-04 0d
Unscheduled
2001-10-16 2001-10-19 4 216d - -
Unscheduled
2001-03-06 2001-03-14 9 38d - -
Scheduled
2000-10-21 2001-01-27 99 114d 2000-10-21 0d
Unscheduled
2000-06-27 2000-06-29 3 169d - -
Unscheduled
2000-01-10 2000-01-10 1 243d - -
Scheduled
1999-03-27 1999-05-12 47 - 1999-03-27 0d
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