Skip to content
nuclear•chain

San Onofre nuclear power plant 1

Retired United States
Gross capacity
456MW

San Onofre nuclear power plant 1 is a pressurised water reactor unit at San Onofre nuclear power plant in United States rated at 456 MW gross. It is retired. Commercial operation began 1 Jan 1968.

Specification
Reactor type Pressurised water reactor (PWR)
Modelnot disclosed
Size classLarge
CoolantLight water
ModeratorLight water
Gross capacity456MW
Net capacity (reference)436MW
Net capacity (design)436MW
Thermal output1,347MWt
Typical enrichment3–5% U-235
Ownership & location
SiteSan Onofre nuclear power plant
Unit1
CountryUnited States
OwnerSouthern California Edison Co100%
OperatorSouthern California Edison
Coordinates 33.3689, -117.5548
Fuel chain for this unit
Fuel form
Uranium dioxide pellets in zirconium-alloy cladding
Enrichment
3–5% U-235
Who makes this assembly
Upstream

Enriched fuel means this unit sits downstream of five conversion plants and four enrichment operators holding 88% of world capacity between the top three.

RosatomUrencoCNNCOrano
Conversion
CamecoCNNCConverDynOranoRosatom
Fabricator capability is recorded against reactor type and model line, not against named units — utilities do not publish fuel contracts. See the fuel chain.

Timeline

  1. 1 May 1964Construction start
  2. 14 Jun 1967First criticality
  3. 16 Jul 1967Grid connection
  4. 1 Jan 1968Commercial operation
  5. 30 Nov 1992Permanent shutdown

Other units at San Onofre nuclear power plant

UnitStatusGross MW
San Onofre nuclear power plant 2 Retired 1,127
San Onofre nuclear power plant 3 Retired 1,127

Sources