?
This unit is permanently shut down (shutdown date: 2020-08-10).
Shut Down
2020-08-10
?
Longest recorded period of continuous operation between outages (2014-11-24 to 2016-10-04).
680
Record Run
days
?
Breaker-to-Breaker runs — continuous operation exceeding the cycle-adjusted threshold (617 days for this 24-month cycle unit) with no trips to 0% power.
3
B2B Runs
?
Lifetime capacity factor: average power level across all recorded days (100% = always at full power).
86.7%
Capacity Factor
?
Total number of scheduled refueling outages detected in the historical data. D&D shutdown period excluded.
11
Outages
since 1999
?
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)
?
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
?
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.
?
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
Between refueling outages, Duane Arnold runs about 689 days, or roughly 23 months, per cycle. That average comes from 10 completed cycles, the most recent lasting 701 days.
?
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.
?
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, flat stretches near the top are full-power running and drops to zero are outages.
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 |
|---|---|---|---|---|---|---|
| 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 |
| 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 | - | - |
| 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
Startup Hold
|
2009-03-03 | 2009-03-03 | 1 | 3d | - | - |
|
Scheduled
|
2009-02-02 | 2009-02-28 | 27 | 670d | 2009-02-01 | +1d |
| 2007-04-03 | 2007-04-04 | 2 | 14d | - | - | |
| 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
Startup Hold
|
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 | - | - |
| 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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