Pilgrim 1

Decommissioned

Holtec International·Plymouth, MA·BWR·685 MWe

Outage History Daily Power Log Get alerts

Decommissioned

Permanently shut down on 2019-05-31. 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: 2019-05-31).
Shut Down
2019-05-31
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Longest recorded period of continuous operation between outages (2009-05-18 to 2011-02-21).
644
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.
0
B2B Runs
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Lifetime capacity factor: average power level across all recorded days (100% = always at full power).
88.9%
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.
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.
95.7%
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, Pilgrim 1 has spent 410 days in scheduled refueling outages and 219 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

Pilgrim 1 has 57 outages plotted here, averaging 10 days each. The most recent, in May 2019, was a unplanned outage lasting 4 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

Pilgrim 1 has completed 10 scheduled refueling outages on record, averaging 32 days each. The most recent, in Apr 2017, ran 39 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, Pilgrim 1 takes about 7 days to climb from first power back to full power. That average is drawn from 10 startups on record, and the most recent took 7 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

5 of 10 refuelings 33 days median 86% power at shutdown 0.3% per day
Pilgrim 1 coasted down for a week or longer before 5 of its 10 refuelings on record. Those coastdowns ran a median of 33 days and ended near 86% power. The most recent refueling, in Apr 2017, began with no extended coastdown.
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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, Pilgrim 1 has run at about 88.9% of its rated capacity. Across the last 12 reported months it averaged 65.6%. 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 Pilgrim 1, 58 in all since 1999. Of those, 11 were scheduled refueling outages, 1 was planned maintenance and 46 were unplanned or forced. The typical outage lasted about 11 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 RFO 22SGR/Major
2019-06-01 Decommissioned 1 (D&D) 11d 2019-04-11 +51d
Scram # 54071 Manual
2019-05-18 2019-05-21 4 219d - -
Scram # 53648 Auto
2018-10-06 2018-10-11 6 157d - -
Unscheduled
2018-04-28 2018-05-02 5 11d - -
Unscheduled
2018-03-07 2018-04-17 42 56d - -
Scram # 53147 Manual
2018-01-05 2018-01-10 6 229d - -
Unscheduled
2017-05-20 2017-05-21 2 2d - -
Scheduled RFO 21
2017-04-10 2017-05-18 39 58d 2017-04-19 -9d
Unscheduled
2017-02-10 2017-02-11 2 50d - -
Unscheduled
2016-12-17 2016-12-22 6 92d - -
Unscheduled
2016-09-14 2016-09-16 3 2d - -
Scram # 52223 Manual
2016-09-07 2016-09-12 6 14d - -
Unscheduled
2016-08-22 2016-08-24 3 194d - -
Unscheduled
2016-02-09 2016-02-10 2 169d - -
Scram # 51338 Auto
2015-08-23 2015-08-24 2 92d - -
Scram # 51087 Manual
2015-05-23 2015-05-23 1 2d - -
Scheduled RFO 20
2015-04-20 2015-05-21 32 62d 2015-04-12 +8d
Unscheduled
2015-02-15 2015-02-17 3 8d - -
Scram # 50769 Auto
2015-01-27 2015-02-07 12 254d - -
Unscheduled
2014-05-14 2014-05-18 5 159d - -
Unscheduled
2013-12-05 2013-12-06 2 46d - -
Scram # 49441 Auto
2013-10-15 2013-10-20 6 31d - -
Unscheduled
2013-09-09 2013-09-14 6 15d - -
Scram # 49296 Manual
2013-08-23 2013-08-25 3 87d - -
Unscheduled
2013-05-25 2013-05-28 4 3d - -
Scheduled RFO 19
2013-04-15 2013-05-22 38 59d 2013-04-14 +1d
Scram # 48736 Auto
2013-02-09 2013-02-15 7 18d - -
Unscheduled
2013-01-22 2013-01-22 1 7d - -
Scram # 48664 Manual
2013-01-11 2013-01-15 5 232d - -
Scram # 47945 Manual
2012-05-23 2012-05-24 2 146d - -
Unscheduled
2011-12-27 2011-12-29 3 33d - -
Unscheduled
2011-11-18 2011-11-24 7 184d - -
Unscheduled Startup Hold
2011-05-15 2011-05-18 4 4d - -
Scheduled RFO 18
2011-04-18 2011-05-11 24 55d 2011-04-17 +1d
Unscheduled
2011-02-21 2011-02-22 2 644d - -
Scheduled RFO 17
2009-04-18 2009-05-18 31 118d 2009-04-15 +3d
Unscheduled
2008-12-20 2008-12-21 2 258d - -
Unscheduled
2008-04-06 2008-04-06 1 116d - -
Planned Mid-Cycle Planned
2007-12-11 2007-12-12 2 152d - -
Unscheduled
2007-07-11 2007-07-12 2 63d - -
Scheduled RFO 16
2007-04-07 2007-05-09 33 19d 2007-04-06 +1d
Unscheduled
2007-03-18 2007-03-19 2 368d - -
Unscheduled
2006-03-14 2006-03-15 2 307d - -
Scheduled RFO 15
2005-04-19 2005-05-11 23 391d 2005-04-18 +1d
Unscheduled
2004-03-23 2004-03-24 2 165d - -
Unscheduled
2003-09-30 2003-10-10 11 120d - -
Unscheduled
2003-06-01 2003-06-02 2 14d - -
Unscheduled Startup Hold
2003-05-17 2003-05-18 2 5d - -
Scheduled RFO 14
2003-04-19 2003-05-12 24 49d 2003-04-19 0d
Unscheduled
2003-02-22 2003-03-01 8 419d - -
Unscheduled
2001-12-28 2001-12-30 3 133d - -
Unscheduled
2001-08-14 2001-08-17 4 89d - -
Scheduled RFO 13
2001-04-22 2001-05-17 26 200d 2001-04-22 0d
Unscheduled
2000-10-02 2000-10-04 3 38d - -
Unscheduled
2000-08-22 2000-08-25 4 339d - -
Unscheduled
1999-09-14 1999-09-18 5 38d - -
Unscheduled
1999-08-06 1999-08-07 2 37d - -
Scheduled RFO 12
1999-05-09 1999-06-30 53 - 1999-05-09 0d
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