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U.S. Nuclear Reactors

San Onofre Unit 3

San Clemente, California
Local population: 105,010 (10-mile radius)


Pressurized Water Reactor


Licensed to operate from 09/16/83-11/15/22


Southern California Edison Company

Safety Issues:

Fire Protection Problems, Groundwater Leaks Reported, Near Misses, Year Plus Outages

San Onofre nuclear power plant
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Related Links & Documents

11/13/2012   Fission Stories #118 addressed the flawed computer studies that contributed to the steam generator tube degradation problems and which may still impair remediation efforts.

05/15/2012   Fission Stories #92 covered the site topping the list of safety allegations received by the NRC from plant workers in 2009, 2010, 2011, and 2012.

01/31/2012   An All Things Nuclear blog post explained how a broken tube inside a steam generator forced workers to shut down the reactor and many more damaged tubes prevented it from immediately restarting.

05/03/2006   UCS commended Southern California Edison for responding to a recent safety culture survey reporting very good results as an opportunity for improvement rather than as evidence for no further attention required.
Download the pdf

07/14/1991   Fission Stories #55 describes a mistake made to prepare for a maintenance task resulted in the spent fuel pool being overfilled with water and an adjacent building being flooded with slightly radioactive water.