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Duane Arnold - Status & History

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

Decommissioned

Permanently shut down on 2020-08-10. 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
2020-08-11 Decommissioned 1 (D&D) 478d 2020-09-03 -23d
Scram # 54012
2019-04-21 2019-04-21 1 182d - -
Scram # 53676
2018-10-20 2018-10-21 2 29d - -
Scheduled
2018-09-05 2018-09-21 17 315d 2018-09-04 +1d
Unscheduled
2017-10-23 2017-10-25 3 358d - -
Scheduled
2016-10-04 2016-10-30 27 680d 2016-10-08 -4d
Scheduled
2014-10-04 2014-11-24 52 666d 2014-10-04 0d
Unscheduled
2012-12-02 2012-12-07 6 6d - -
Scheduled
2012-10-06 2012-11-26 52 417d 2012-10-06 0d
Unscheduled
2011-08-12 2011-08-16 5 250d - -
Unscheduled
2010-12-04 2010-12-05 2 2d - -
Scheduled
2010-10-24 2010-12-02 40 176d 2010-10-23 +1d
Unscheduled
2010-04-26 2010-05-01 6 198d - -
Unscheduled
2009-10-09 2009-10-10 2 188d - -
Unscheduled
2009-04-03 2009-04-04 2 31d - -
Unscheduled
2009-03-03 2009-03-03 1 3d - -
Scheduled
2009-02-02 2009-02-28 27 670d 2009-02-01 +1d
Unscheduled
2007-04-03 2007-04-04 2 14d - -
Unscheduled
2007-03-19 2007-03-20 2 3d - -
Scheduled
2007-02-05 2007-03-16 40 88d 2007-02-04 +1d
Unscheduled
2006-11-06 2006-11-09 4 553d - -
Scheduled
2005-03-29 2005-05-02 35 152d 2005-03-28 +1d
Unscheduled
2004-10-26 2004-10-28 3 187d - -
Unscheduled
2004-04-19 2004-04-22 4 137d - -
Unscheduled
2003-11-30 2003-12-04 5 3d - -
Unscheduled
2003-11-26 2003-11-27 2 2d - -
Unscheduled
2003-11-19 2003-11-24 6 11d - -
Unscheduled
2003-11-07 2003-11-08 2 2d - -
Unscheduled
2003-11-04 2003-11-05 2 199d - -
Unscheduled
2003-04-19 2003-04-19 1 2d - -
Scheduled
2003-03-24 2003-04-17 25 38d 2003-03-24 0d
Unscheduled
2003-02-01 2003-02-14 14 146d - -
Unscheduled
2002-09-03 2002-09-08 6 2d - -
Unscheduled
2002-08-31 2002-09-01 2 20d - -
Unscheduled
2002-08-07 2002-08-11 5 77d - -
Unscheduled
2002-05-20 2002-05-22 3 73d - -
Unscheduled
2002-03-04 2002-03-08 5 133d - -
Unscheduled
2001-10-18 2001-10-22 5 65d - -
Unscheduled
2001-08-13 2001-08-14 2 80d - -
Scheduled
2001-04-13 2001-05-25 43 292d 2001-04-13 0d
Unscheduled
2000-06-24 2000-06-25 2 167d - -
Unscheduled
2000-01-06 2000-01-09 4 38d - -
Unscheduled
1999-11-29 1999-11-29 1 2d - -
Scheduled
1999-10-23 1999-11-27 36 131d 1999-10-23 0d
Unscheduled
1999-06-07 1999-06-14 8 39d - -
Unscheduled
1999-04-18 1999-04-29 12 - - -
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