Vermont Yankee

Decommissioned

NorthStar Group Services·Vernon, VT·BWR·506 MWe

Data refreshed 1.1h ago Rx Status: Jan 13, 2015 (M-F)

Outage History Daily Power Log Get alerts

Decommissioned

Permanently shut down on 2014-12-29. 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: 2014-12-29).
Shut Down
2014-12-29
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Longest recorded period of continuous operation between outages (2005-11-11 to 2007-05-14).
549
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.
4
B2B Runs
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Lifetime capacity factor: average power level across all recorded days (100% = always at full power).
92.2%
Capacity Factor
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Total number of scheduled refueling outages detected in the historical data. D&D shutdown period excluded.
10
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.
6
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.
97.6%
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, Vermont Yankee has spent 247 days in scheduled refueling outages and 59 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

Vermont Yankee has 20 outages plotted here, averaging 15 days each. The most recent, in Mar 2013, was a scheduled refueling outage lasting 26 days.
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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

Vermont Yankee has completed 10 scheduled refueling outages on record, averaging 25 days each. The most recent, in Mar 2013, ran 26 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, Vermont Yankee takes about 4 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

7 of 10 refuelings 19 days median 92% power at shutdown 0.2% per day
Vermont Yankee coasted down for a week or longer before 7 of its 10 refuelings on record. Those coastdowns ran a median of 19 days and ended near 92% power. The most recent refueling, in Mar 2013, followed a 21-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, Vermont Yankee has run at about 92.2% of its rated capacity. Across the last 12 reported months it averaged 86.4%. 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 Vermont Yankee, 21 in all since 1999. Of those, 10 were scheduled refueling outages and 11 were unplanned or forced. The typical outage lasted about 15 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
Unscheduled
2014-12-30 Decommissioned 1 (D&D) 635d - -
Scheduled RFO 30
2013-03-10 2013-04-04 26 494d 2013-03-09 +1d
Scheduled RFO 29
2011-10-09 2011-11-02 25 333d 2011-10-16 -7d
Unscheduled
2010-11-08 2010-11-10 3 164d - -
Unscheduled
2010-05-27 2010-05-28 2 5d - -
Scheduled RFO 28
2010-04-25 2010-05-22 28 532d 2010-04-24 +1d
Scheduled RFO 27
2008-10-19 2008-11-09 22 415d 2008-10-12 +7d
Unscheduled
2007-08-31 2007-08-31 1 87d - -
Scheduled RFO 26
2007-05-14 2007-06-05 23 549d 2007-05-13 +1d
Scheduled RFO 25
2005-10-23 2005-11-11 20 88d 2005-10-22 +1d
Unscheduled
2005-07-26 2005-07-27 2 385d - -
Unscheduled
2004-06-19 2004-07-06 18 47d - -
Scheduled RFO 24
2004-04-05 2004-05-03 29 186d 2004-04-03 +2d
Unscheduled
2003-09-30 2003-10-02 3 2d - -
Unscheduled
2003-09-28 2003-09-28 1 338d - -
Scheduled RFO 23
2002-10-07 2002-10-25 19 138d 2002-10-07 0d
Unscheduled
2002-05-12 2002-05-22 11 358d - -
Scheduled RFO 22
2001-04-28 2001-05-19 22 38d 2001-04-28 0d
Unscheduled
2001-03-20 2001-03-21 2 187d - -
Unscheduled
2000-09-14 2000-09-14 1 288d - -
Scheduled RFO 21
1999-10-30 1999-12-01 33 - 1999-10-30 0d
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