Media Contact: Gil Alexander, (626) 302-2255

ROSEMEAD, Calif., Jan. 31, 2012 – Southern California Edison (SCE), operator of the San Onofre Nuclear Generating Station, has begun a precautionary shutdown of Unit 3 because sensors installed for this purpose detected a possible leak in one of the unit’s steam generator tubes.

The potential leak poses no imminent danger to the public or plant workers. There has been no release to the atmosphere. San Onofre personnel will evaluate the cause of the leak and the steps required to repair it and resume operations.

Unit 2 is currently offline for a planned maintenance, refueling and technology upgrade outage. Southern California Edison has ample reserve power to meet customer needs while Unit 3 is offline.

The Nuclear Regulatory Commission was immediately informed of this development.

About Southern California Edison
An Edison International (NYSE:EIX) company, Southern California Edison is one of the nation’s largest electric utilities, serving a population of nearly 14 million via 4.9 million customer accounts in a 50,000-square-mile service area within Central, Coastal and Southern California.


San Onofre Nuclear Generating Station Operators Perform Precautionary Shutdown of Reactor Unit