Duane Arnold

Decommissioned

NextEra Energy·Palo, IA·BWR·562 MWe

Data refreshed 4h ago Rx Status: Mar 22, 2021 (M-F)

Outage History Daily Power Log Get alerts

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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This unit is permanently shut down (shutdown date: 2020-08-10).
Shut Down
2020-08-10
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Longest recorded period of continuous operation between outages (2014-11-24 to 2016-10-04).
680
Record Run
days
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Breaker-to-Breaker runs — continuous operation exceeding the cycle-adjusted threshold set for this unit with no trips to 0% power.
3
B2B Runs
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Lifetime capacity factor: average power level across all recorded days (100% = always at full power).
86.7%
Capacity Factor
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Total number of scheduled refueling outages detected in the historical data. D&D shutdown period excluded.
11
Outages
since 1999
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Average time from first power generation (>0%) to sustained full power (≥95% for 2+ days) across the last 3 scheduled outages. Click to compare against the fleet on the Operator Efficiency Leaderboard.
18.3
Avg Startup
days (last 3)
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Average fuel utilization — percent of the designed fuel cycle that this unit consumes before refueling, derived from the historical burn-down trajectory. Higher = more efficient operator (refuels with less margin remaining; closer to coastdown). Computed as 100% minus the unit's average refuel-point fuel %, using the last 3 years where available, otherwise lifetime average. Click to compare against the fleet on the Operator Efficiency Leaderboard.
90.5%
Fuel Utilization
lifetime avg

Outage Record

Outage Days by Year

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Total days spent in outage each year, split by scheduled refueling (blue) and forced/unplanned (red). Lower totals indicate better reliability and outage execution. Hover for details.
Across its recorded history, Duane Arnold has spent 394 days in scheduled refueling outages and 132 days in forced or unplanned outages. Taller bars mark the years with the most downtime.
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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

Duane Arnold has 45 outages plotted here, averaging 12 days each. The most recent, in Apr 2019, was a unplanned outage lasting 1 day.
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Scheduled refueling outage durations over time. Green bars are at or below this unit's average, amber up to 30% above it, red beyond that. The dashed line is the average. Shorter outages mean better execution.

Refueling Duration Trend

Duane Arnold has completed 11 scheduled refueling outages on record, averaging 36 days each. The most recent, in Sep 2018, ran 17 days.
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Time in days from first power generation (>0%) to sustained full power (≥95% for 2+ consecutive days) after each scheduled refueling outage. The dashed line marks the average. Includes startup testing holds and power dips.

Startup Duration Trend

After a refueling outage, Duane Arnold takes about 10 days to climb from first power back to full power. That average is drawn from 10 startups on record, and the most recent took 5 days.
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Daily reactor power over the 120 days before each scheduled refueling outage, one line per refueling, lined up on the day the outage began. A coastdown is the slow decline as the fuel runs out near the end of a cycle. The highlighted line is the most recent refueling and fainter lines are older. Counts and medians cover coastdowns of a week or longer. A shutdown straight from full power, with no decline ahead of it, is what a forced outage looks like.

Coastdown Before Refueling

9 of 11 refuelings 36 days median 90% power at shutdown 0.2% per day
Duane Arnold coasted down for a week or longer before 9 of its 11 refuelings on record. Those coastdowns ran a median of 36 days and ended near 90% power. The most recent refueling, in Sep 2018, followed a 51-day coastdown from 97% to 90%.
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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

Over its operating life, Duane Arnold has run at about 86.7% of its rated capacity. Across the last 12 reported months it averaged 30.2%. On the chart, green stretches near the top are full-power running, amber marks reduced power (50 to 89%), and red drops toward zero are outages.

Outage History & Daily Power Log

This table logs every recorded outage for Duane Arnold, 46 in all since 1999. Of those, 12 were scheduled refueling outages and 34 were unplanned or forced. The typical outage lasted about 16 days. Where the Scheduled column shows (Model), the date is a NukeWorker projection because the utility had not published one.
Type ⇅ Actual Start ⇅ Actual End ⇅ Duration ⇅ Days Online ⇅ Scheduled Delta
Scheduled # 54826 Auto RFO 27SGR/Major
2020-08-11 Decommissioned 1 (D&D) 478d 2020-09-03 -23d
Scram # 54012 Manual
2019-04-21 2019-04-21 1 182d - -
Scram # 53676 Auto
2018-10-20 2018-10-21 2 29d - -
Scheduled RFO 26
2018-09-05 2018-09-21 17 315d 2018-09-04 +1d
Unscheduled
2017-10-23 2017-10-25 3 358d - -
Scheduled RFO 25
2016-10-04 2016-10-30 27 680d 2016-10-08 -4d
Scheduled RFO 24
2014-10-04 2014-11-24 52 666d 2014-10-04 0d
Unscheduled
2012-12-02 2012-12-07 6 6d - -
Scheduled RFO 23
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 RFO 22
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 Startup Hold
2009-03-03 2009-03-03 1 3d - -
Scheduled RFO 21
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 RFO 20
2007-02-05 2007-03-16 40 88d 2007-02-04 +1d
Unscheduled
2006-11-06 2006-11-09 4 553d - -
Scheduled RFO 19
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 Startup Hold
2003-04-19 2003-04-19 1 2d - -
Scheduled RFO 18
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 RFO 17
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 RFO 16
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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