?
Current reactor power level from the most recent NRC daily report.
Shut Down
?
Days of continuous operation since the last outage ended. Ranked against all operating units.
4,743
Current Run
days
?
Longest recorded period of continuous operation between outages.
4,743
Record Run
days
?
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
?
Lifetime capacity factor: average power level across all recorded days (100% = always at full power). Ranked against all NRC-tracked units.
74.8%
Capacity Factor
?
Community rating score (Bayesian-adjusted). Based on 92 votes. Ranked against all rated facilities.
47.8
Rating
92 votes
#73 of 97
Mid Quartile
?
Total NRC-reported scram events (emergency reactor shutdowns). Ranked fleet-wide — fewer scrams = better rank.
2
Scrams
?
Years since commercial operation began.
27.8
Operating Age
years
Breaker-to-Breaker Runs 2 runs
Breaker-to-breaker runs measure continuous operation between refueling outages using a cycle-adjusted threshold (90% of cycle length minus RFO duration). An active streak means the unit has been running continuously since the last refueling with no trips to 0% power.
San Onofre 3 has logged 2 breaker-to-breaker runs, continuous stretches from one refueling to the next with no trip to zero power. Its longest ran 661 days, and its runs average 629 days.
661
Best Run (days)
2008-12-18 → 2010-10-10
629
Avg Run (days)
All Runs
| 2008-12-18 | 2010-10-10 | 661 days |
| 1999-05-17 | 2001-01-03 | 597 days |
Scram History 2 events since 2011
Automatic and manual reactor scram (emergency shutdown) events reported to the NRC since 2011. Includes event dates, trip type, and average recovery time. Click the title to view the full fleet scram dashboard.
San Onofre 3 has recorded 2 reactor scrams, or emergency shutdowns, since 2011 (1 automatic, 1 manual). On average the unit was back to full power about 5 days after each trip.
Outage Duration Trend
?Scheduled refueling outage durations over time. Green bars are below average, yellow near average, red above. Dashed line shows the plant's historical average. Shorter outages mean better execution.
San Onofre 3 has completed 4 scheduled refueling outages on record, averaging 85 days each. The most recent, in Oct 2010, ran 130 days.
Outage Days by Year
?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.
Facility Statistics
Key performance and lifecycle metrics calculated from NRC operational data. Includes operating age, construction timeline, capacity factor, efficiency, generation totals, and reliability records.
San Onofre 3 has operated for about 27.8 years and averaged a 74.8% lifetime capacity factor, generating roughly 102.9 TWh of electricity. Its longest unbroken run reached 4,743 days.
Lifecycle & Tenure
Operating Age: 27.8 Yrs
Build Time: 10.5 Yrs
Lic. Remaining: N/A Yrs
Production & Power
Lifetime CF: 74.8%
Efficiency: 31.9%
Generated: 102.9 TWh
Reliability & Outages
Record Run: 4,743 Days
Refuelings: 4
Avg Startup: 12.8 Days
NukeWorker Member Ratings 92 votes
Community ratings from NukeWorker members. Vote to share your experience working at this facility. Score uses a Bayesian average that accounts for vote count — facilities with few votes are pulled toward the fleet average, so rankings reflect confidence, not just raw percentages.
Above Average
27 (29%)
Average
31 (33%)
Below Average
34 (36%)
Facility Map
Interactive satellite map showing the facility's geographic location. Marker color indicates current status: green for online, red for offline, orange for reduced power. Click the header to open in Google Maps satellite view.
33.3691, -117.555
Location & Contact
Physical address, phone number, and website for this facility. Use the directions link to get driving directions via Google Maps.
Phone:
(714) 302-1212
Website:
http://www.sce.com
Per Diem Rates FY 2026
Per diem covers lodging and meals & incidental expenses (M&IE) for government and contractor travel near this facility. Rates are from GSA for FY 2026.
$191
Lodging/Night
$86
M&IE/Day
$277
Total/Day
Los Angeles, Los Angeles / Orange / Ventura / Edwards AFB less the city of Santa Monica County, CA
Unemployment Benefits CA
Maximum state unemployment insurance benefits for CA. Actual benefits depend on your earnings history and may be lower than the maximum. Data as of Jan 2026.
$450
Max Weekly
26
Max Weeks
$11,700
Max Total
7-day waiting period before benefits begin
Jobs in CA 4 active
Active nuclear industry job listings in CA from the NukeWorker job board. Click a job title for full details, or click the header to search all jobs in this state.
Photos
Photos of this facility from the NukeWorker photo gallery. Click the header or any photo to browse the full album.
Ownership & Construction
The utility or company that owns and operates the facility, the architect-engineer responsible for plant design, and the primary construction contractor. Click names to view all facilities by that entity on the map.
Technical Specs
Reactor design specifications including type (PWR/BWR), containment design, nuclear steam supply system manufacturer, thermal and electrical power ratings, and current operational status.
Reactor Type:
PWR
Containment:
PWR-DRYAMB
NSS Supplier:
COMB CE
Thermal Power:
3390 MWt
Net Capacity:
1080 MWe
Efficiency:
31.9%
Status:
Decommissioned
Licensing
NRC licensing history including docket number, license type and number, construction permit date, operating license issuance, commercial operation date, license renewal, and expiration date.
Docket #:
05000362
License #:
NPF-15
License Type:
OL-FP
Const. Permit:
1973-10-18
Operating Lic:
1983-09-16
Commercial Op:
1984-04-01
License Exp:
2013-10-18