San Onofre 2 - Status & History

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

Plant Info Outage History Daily Power Log

Decommissioned

Permanently shut down on 2012-01-09. 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: 2012-01-09).
Shut Down
2012-01-09
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Longest recorded period of continuous operation between outages (2009-09-16 to 2011-09-09).
723
Record Run
days
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Breaker-to-Breaker runs — continuous operation exceeding the cycle-adjusted threshold (400 days for this 24-month cycle unit) with no trips to 0% power.
1
B2B Runs
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Lifetime capacity factor: average power level across all recorded days (100% = always at full power).
75.5%
Capacity Factor
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Total number of scheduled refueling outages detected in the historical data. D&D shutdown period excluded.
3
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.
91.4%
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

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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

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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

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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

Type ⇅ Actual Start ⇅ Actual End ⇅ Duration ⇅ Days Online ⇅ Scheduled Delta
Scheduled Ext. Shutdown
2012-01-10 Decommissioned 1 (D&D) 122d 2012-01-10 0d
Scram # 47252
2011-09-09 2011-09-10 2 518d - -
Scram # 47252
2011-09-09 2011-09-10 2 1d - -
Scheduled SGR/Major
2009-09-27 2010-04-09 195 11d 2009-09-27 0d
Unscheduled
2009-09-14 2009-09-16 3 208d - -
Unscheduled
2008-12-28 2009-02-18 53 202d - -
Unscheduled
2008-06-06 2008-06-09 4 4d - -
Unscheduled
2008-06-02 2008-06-02 1 136d - -
Scheduled
2007-11-27 2008-01-18 53 32d 2007-11-26 +1d
Unscheduled
2007-10-22 2007-10-26 5 116d - -
Unscheduled
2007-06-21 2007-06-28 8 4d - -
Unscheduled
2007-06-16 2007-06-17 2 428d - -
Scheduled
2006-01-04 2006-04-14 101 261d 2006-01-03 +1d
Unscheduled
2005-04-18 2005-04-18 1 42d - -
Unscheduled
2005-02-16 2005-03-07 20 10d - -
Unscheduled
2005-02-04 2005-02-06 3 76d - -
Unscheduled
2004-11-20 2004-11-20 1 223d - -
Unscheduled
2004-04-11 2004-04-11 1 8d - -
Scheduled
2004-02-10 2004-04-03 54 232d 2004-02-09 +1d
Unscheduled
2003-06-22 2003-06-23 2 140d - -
Unscheduled
2003-02-02 2003-02-02 1 88d - -
Unscheduled
2002-11-03 2002-11-06 4 125d - -
Unscheduled
2002-07-01 2002-07-01 1 2d - -
Unscheduled
2002-05-21 2002-06-29 40 211d - -
Unscheduled
2001-10-14 2001-10-22 9 332d - -
Unscheduled
2000-10-08 2000-11-16 40 591d - -
Unscheduled
1999-01-03 1999-02-25 54 - - -
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