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Pilgrim 1 - Status & History

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

Decommissioned

Permanently shut down on 2019-05-31. Outage statistics below reflect only the operating period. The final shutdown is not counted as an outage.
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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
2019-06-01 Decommissioned 1 (D&D) 11d 2019-04-11 +51d
Scram # 54071
2019-05-18 2019-05-21 4 219d - -
Scram # 53648
2018-10-06 2018-10-11 6 157d - -
Unscheduled
2018-04-28 2018-05-02 5 11d - -
Unscheduled
2018-03-07 2018-04-17 42 56d - -
Scram # 53147
2018-01-05 2018-01-10 6 229d - -
Unscheduled
2017-05-20 2017-05-21 2 2d - -
Scheduled
2017-04-10 2017-05-18 39 58d 2017-04-19 -9d
Unscheduled
2017-02-10 2017-02-11 2 50d - -
Unscheduled
2016-12-17 2016-12-22 6 92d - -
Unscheduled
2016-09-14 2016-09-16 3 2d - -
Scram # 52223
2016-09-07 2016-09-12 6 14d - -
Unscheduled
2016-08-22 2016-08-24 3 194d - -
Unscheduled
2016-02-09 2016-02-10 2 169d - -
Scram # 51338
2015-08-23 2015-08-24 2 92d - -
Scram # 51087
2015-05-23 2015-05-23 1 2d - -
Scheduled
2015-04-20 2015-05-21 32 62d 2015-04-12 +8d
Unscheduled
2015-02-15 2015-02-17 3 8d - -
Scram # 50769
2015-01-27 2015-02-07 12 254d - -
Unscheduled
2014-05-14 2014-05-18 5 159d - -
Unscheduled
2013-12-05 2013-12-06 2 46d - -
Scram # 49441
2013-10-15 2013-10-20 6 31d - -
Unscheduled
2013-09-09 2013-09-14 6 15d - -
Scram # 49296
2013-08-23 2013-08-25 3 87d - -
Unscheduled
2013-05-25 2013-05-28 4 3d - -
Scheduled
2013-04-15 2013-05-22 38 59d 2013-04-14 +1d
Scram # 48736
2013-02-09 2013-02-15 7 18d - -
Unscheduled
2013-01-22 2013-01-22 1 7d - -
Scram # 48664
2013-01-11 2013-01-15 5 232d - -
Scram # 47945
2012-05-23 2012-05-24 2 146d - -
Unscheduled
2011-12-27 2011-12-29 3 33d - -
Unscheduled
2011-11-18 2011-11-24 7 184d - -
Unscheduled
2011-05-15 2011-05-18 4 4d - -
Scheduled
2011-04-18 2011-05-11 24 55d 2011-04-17 +1d
Unscheduled
2011-02-21 2011-02-22 2 644d - -
Scheduled
2009-04-18 2009-05-18 31 118d 2009-04-15 +3d
Unscheduled
2008-12-20 2008-12-21 2 258d - -
Unscheduled
2008-04-06 2008-04-06 1 116d - -
Unscheduled
2007-12-11 2007-12-12 2 152d - -
Unscheduled
2007-07-11 2007-07-12 2 63d - -
Scheduled
2007-04-07 2007-05-09 33 19d 2007-04-06 +1d
Unscheduled
2007-03-18 2007-03-19 2 368d - -
Unscheduled
2006-03-14 2006-03-15 2 307d - -
Scheduled
2005-04-19 2005-05-11 23 391d 2005-04-18 +1d
Unscheduled
2004-03-23 2004-03-24 2 165d - -
Unscheduled
2003-09-30 2003-10-10 11 120d - -
Unscheduled
2003-06-01 2003-06-02 2 14d - -
Unscheduled
2003-05-17 2003-05-18 2 5d - -
Scheduled
2003-04-19 2003-05-12 24 49d 2003-04-19 0d
Unscheduled
2003-02-22 2003-03-01 8 419d - -
Unscheduled
2001-12-28 2001-12-30 3 133d - -
Unscheduled
2001-08-14 2001-08-17 4 89d - -
Scheduled
2001-04-22 2001-05-17 26 200d 2001-04-22 0d
Unscheduled
2000-10-02 2000-10-04 3 38d - -
Unscheduled
2000-08-22 2000-08-25 4 339d - -
Unscheduled
1999-09-14 1999-09-18 5 38d - -
Unscheduled
1999-08-06 1999-08-07 2 37d - -
Scheduled
1999-05-09 1999-06-30 53 - 1999-05-09 0d
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