San Onofre 3 - Status & History

Comprehensive reactor performance metrics, cycle analysis, and historical outage data.
Data refreshed 10.2h ago Rx Status: Jul 24, 2013 (M-F)

Plant Info 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 (532 days for this 24-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).
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
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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 20 outages plotted here, averaging 35 days each. The most recent, in Sep 2011, was a unplanned outage lasting 3 days.
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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, San Onofre 3 runs about 734 days, or roughly 24 months, per cycle. That average comes from 3 completed cycles, the most recent lasting 727 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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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, flat stretches near the top are full-power running and drops to zero are outages.
This table logs every recorded outage for San Onofre 3, 21 in all since 1999. Of those, 4 were scheduled refueling outages and 17 were unplanned or forced. The typical outage lasted about 59 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 Ext. Shutdown
2012-02-01 Decommissioned 1 (D&D) 143d - -
Scram # 47252
2011-09-09 2011-09-11 3 205d - -
Scram # 47252
2011-09-09 2011-09-11 3 2d - -
Scheduled
2010-10-10 2011-02-16 130 662d 2010-09-26 +14d
Scheduled
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
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
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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