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Byron 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
2026-03-02 2026-04-01 31 519d 2026-03-02 0d
Scheduled
2024-09-09 2024-09-29 21 535d 2024-09-09 0d
Scheduled
2023-03-06 2023-03-24 19 522d 2023-03-06 0d
Scheduled
2021-09-13 2021-09-30 18 536d 2021-09-03 +10d
Scheduled
2020-03-09 2020-03-26 18 532d 2020-03-09 0d
Scheduled
2018-09-10 2018-09-24 15 533d 2018-09-10 0d
Scheduled
2017-02-27 2017-03-26 28 514d 2017-02-27 0d
Scheduled
2015-09-14 2015-10-02 19 190d 2015-09-07 +7d
Scram # 50859
2015-03-04 2015-03-08 5 342d - -
Scheduled
2014-03-10 2014-03-27 18 519d 2014-03-10 0d
Scheduled
2012-09-10 2012-10-07 28 179d 2012-09-09 +1d
Unscheduled
2012-03-12 2012-03-15 4 324d - -
Scheduled
2011-03-14 2011-04-23 41 522d 2011-03-14 0d
Scheduled
2009-09-14 2009-10-08 25 518d 2009-09-14 0d
Scheduled
2008-03-24 2008-04-14 22 146d 2008-03-24 0d
Unscheduled
2007-10-20 2007-10-30 11 370d - -
Scheduled
2006-09-11 2006-10-15 35 535d 2006-09-10 +1d
Scheduled
2005-02-28 2005-03-25 26 504d 2005-02-27 +1d
Scheduled
2003-09-23 2003-10-13 21 319d 2003-09-23 0d
Unscheduled
2002-11-08 2002-11-08 1 23d - -
Unscheduled
2002-10-16 2002-10-16 1 201d - -
Scheduled
2002-03-12 2002-03-29 18 518d 2002-03-12 0d
Scheduled
2000-09-23 2000-10-10 18 495d 2000-09-23 0d
Unscheduled
1999-05-14 1999-05-17 4 20d - -
Scheduled
1999-03-27 1999-04-24 29 - 1999-03-27 0d
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