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Millstone 3 - 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

Unscheduled
2025-10-17 2025-10-26 10 75d - -
Unscheduled
2025-08-01 2025-08-03 3 76d - -
Scheduled
2025-04-11 2025-05-17 37 207d 2025-04-13 -2d
Unscheduled
2024-09-04 2024-09-16 13 231d - -
Unscheduled
2024-01-09 2024-01-17 9 32d - -
Unscheduled
2023-12-03 2023-12-08 6 3d - -
Scheduled
2023-10-20 2023-11-30 42 114d 2023-10-14 +6d
Scram # 56544
2023-05-31 2023-06-28 29 363d - -
Scheduled
2022-04-08 2022-06-02 56 295d 2022-04-07 +1d
Unscheduled
2021-06-11 2021-06-17 7 159d - -
Unscheduled
2020-12-31 2021-01-03 4 50d - -
Scheduled
2020-10-02 2020-11-11 41 171d 2020-10-19 -17d
Scram # 54663
2020-04-14 2020-04-14 1 4d - -
Scram # 54631
2020-04-02 2020-04-10 9 102d - -
Unscheduled
2019-12-18 2019-12-22 5 218d - -
Scheduled
2019-04-12 2019-05-14 33 515d 2019-04-13 -1d
Scheduled
2017-10-13 2017-11-13 32 477d 2017-10-08 +5d
Scram # 52000
2016-06-13 2016-06-23 11 27d - -
Scram # 51929
2016-05-16 2016-05-17 2 4d - -
Scheduled
2016-04-10 2016-05-12 33 73d 2016-04-10 0d
Scram # 51682
2016-01-25 2016-01-28 4 435d - -
Scheduled
2014-10-12 2014-11-16 36 132d 2014-10-12 0d
Scram # 50141
2014-05-26 2014-06-02 8 286d - -
Scram # 49260
2013-08-10 2013-08-13 4 85d - -
Scheduled
2013-04-14 2013-05-17 34 509d 2013-04-14 0d
Scheduled
2011-10-09 2011-11-22 45 419d 2011-10-09 0d
Unscheduled
2010-08-15 2010-08-16 2 89d - -
Unscheduled
2010-05-18 2010-05-18 1 2d - -
Scheduled
2010-04-11 2010-05-16 36 96d 2010-04-04 +7d
Unscheduled
2009-12-20 2010-01-05 17 392d - -
Scheduled
2008-10-12 2008-11-23 43 513d 2008-10-12 0d
Scheduled
2007-04-07 2007-05-18 42 68d 2007-04-07 0d
Unscheduled
2007-01-29 2007-01-29 1 421d - -
Unscheduled
2005-12-02 2005-12-04 3 36d - -
Scheduled
2005-09-30 2005-10-27 28 153d 2005-09-29 +1d
Unscheduled
2005-04-18 2005-04-30 13 347d - -
Scheduled
2004-04-03 2004-05-06 34 461d 2004-04-02 +1d
Unscheduled
2002-12-23 2002-12-29 7 80d - -
Scheduled
2002-09-07 2002-10-04 28 527d 2002-09-07 0d
Scheduled
2001-02-03 2001-03-29 55 587d 2001-02-03 0d
Unscheduled
1999-05-02 1999-06-27 57 - - -
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