San Onofre 3

Decommissioned

Southern California Edison·San Clemente, CA·PWR·1,080 MWe

Data refreshed 7.8h ago Rx Status: Jul 24, 2013 (M-F)

Outage History Daily Power Log Get alerts

Decommissioned

Permanently shut down on 2012-01-31. 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: 2012-01-31).
Shut Down
2012-01-31
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Longest recorded period of continuous operation between outages (2008-12-17 to 2010-10-10).
662
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.
2
B2B Runs
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Lifetime capacity factor: average power level across all recorded days (100% = always at full power).
74.8%
Capacity Factor
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Total number of scheduled refueling outages detected in the historical data. D&D shutdown period excluded.
4
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.
11
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.
91.2%
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, San Onofre 3 has spent 340 days in scheduled refueling outages and 359 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

San Onofre 3 has 19 outages plotted here, averaging 37 days each. The most recent, in Sep 2011, was a unplanned outage lasting 3 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

San Onofre 3 has completed 4 scheduled refueling outages on record, averaging 85 days each. The most recent, in Oct 2010, ran 130 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, San Onofre 3 takes about 16 days to climb from first power back to full power. That average is drawn from 4 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

2 of 4 refuelings 22 days median 79% power at shutdown 0.8% per day
San Onofre 3 coasted down for a week or longer before 2 of its 4 refuelings on record. Those coastdowns ran a median of 22 days and ended near 79% power. The most recent refueling, in Oct 2010, followed a 18-day coastdown from 96% to 82%.
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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, San Onofre 3 has run at about 74.8% of its rated capacity. Across the last 12 reported months it averaged 0.0%. 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 San Onofre 3, 20 in all since 1999. Of those, 4 were scheduled refueling outages and 16 were unplanned or forced. The typical outage lasted about 62 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
Scram # 47628 Manual Ext. Shutdown
2012-02-01 Decommissioned 1 (D&D) 143d - -
Scram # 47252 Auto
2011-09-09 2011-09-11 3 205d - -
Scheduled 3R16
2010-10-10 2011-02-16 130 662d 2010-09-26 +14d
Scheduled 3R15
2008-10-13 2008-12-17 66 32d 2008-10-15 -2d
Unscheduled
2008-09-02 2008-09-11 10 113d - -
Unscheduled
2008-04-17 2008-05-12 26 160d - -
Unscheduled
2007-10-10 2007-11-09 31 301d - -
Unscheduled
2006-12-13 2006-12-13 1 3d - -
Scheduled 3R14
2006-10-17 2006-12-10 55 162d 2006-10-16 +1d
Unscheduled
2006-03-30 2006-05-08 40 324d - -
Unscheduled
2005-05-05 2005-05-10 6 131d - -
Scheduled 3R13
2004-09-28 2004-12-25 89 114d 2004-09-27 +1d
Unscheduled
2004-06-05 2004-06-06 2 126d - -
Unscheduled
2004-01-25 2004-01-31 7 343d - -
Unscheduled
2003-01-07 2003-02-16 41 310d - -
Unscheduled
2002-02-28 2002-03-03 4 274d - -
Unscheduled
2001-02-04 2001-05-30 116 4d - -
Unscheduled
2001-01-03 2001-01-31 29 598d - -
Unscheduled
1999-05-14 1999-05-16 3 8d - -
Unscheduled
1999-03-28 1999-05-06 40 - - -
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