Fort Calhoun - Status & History

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

Plant Info Outage History Daily Power Log Get alerts

Decommissioned

Permanently shut down on 2016-10-24. 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: 2016-10-24).
Shut Down
2016-10-24
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Longest recorded period of continuous operation between outages (2011-02-05 to 2014-01-10).
1,070
Record Run
days
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Breaker-to-Breaker runs — continuous operation exceeding the cycle-adjusted threshold (436 days for this 18-month cycle unit) with no trips to 0% power.
2
B2B Runs
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Lifetime capacity factor: average power level across all recorded days (100% = always at full power).
73.5%
Capacity Factor
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Total number of scheduled refueling outages detected in the historical data. D&D shutdown period excluded.
8
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.
7.3
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.
97.5%
Fuel Utilization
lifetime avg
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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

Fort Calhoun has 23 outages plotted here, averaging 25 days each. The most recent, in Jun 2016, was a unplanned outage lasting 1 day.
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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

Between refueling outages, Fort Calhoun runs about 756 days, or roughly 25 months, per cycle. That average comes from 7 completed cycles, the most recent lasting 1988 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, Fort Calhoun takes about 6 days to climb from first power back to full power. That average is drawn from 9 startups on record, and the most recent took 4 days.
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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, Fort Calhoun has run at about 73.5% of its rated capacity. Across the last 12 reported months it averaged 79.1%. 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 Fort Calhoun, 25 in all since 1999. Of those, 10 were scheduled refueling outages and 15 were unplanned or forced. The typical outage lasted about 65 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
2016-10-25 Decommissioned 1 (D&D) 124d 2016-10-01 +24d
Scram # 52033
2016-06-23 2016-06-23 1 330d - -
Unscheduled
2015-07-21 2015-07-29 9 43d - -
Scheduled
2015-04-12 2015-06-08 58 113d 2015-04-13 -1d
Scram # 50688
2014-12-18 2014-12-20 3 274d - -
Scram # 49926
2014-03-18 2014-03-19 2 65d - -
Scram # 49717
2014-01-10 2014-01-12 3 23d - -
Scheduled Ext. Shutdown
2011-04-10 2013-12-18 984 64d 2011-04-10 0d
Unscheduled
2011-02-05 2011-02-05 1 42d - -
Unscheduled
2010-12-24 2010-12-25 2 256d - -
Unscheduled
2010-04-09 2010-04-12 4 112d - -
Scheduled
2009-11-01 2009-12-18 48 503d 2009-10-11 +21d
Scheduled
2008-04-20 2008-06-16 58 29d 2008-04-19 +1d
Unscheduled
2008-03-16 2008-03-22 7 469d - -
Scheduled
2006-09-10 2006-12-03 85 127d 2006-09-09 +1d
Unscheduled
2006-04-30 2006-05-06 7 322d - -
Unscheduled
2005-06-05 2005-06-12 8 6d - -
Scheduled
2005-02-27 2005-05-30 93 327d 2005-02-26 +1d
Unscheduled
2004-03-27 2004-04-06 11 150d - -
Scheduled
2003-09-13 2003-10-29 47 469d 2003-09-13 0d
Scheduled
2002-05-04 2002-06-01 29 371d 2002-05-04 0d
Unscheduled
2001-03-16 2001-04-28 44 131d - -
Scheduled
2000-10-14 2000-11-05 23 195d 2000-10-14 0d
Unscheduled
2000-04-01 2000-04-02 2 143d - -
Unscheduled
1999-10-02 1999-11-10 40 - - -
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