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Rosemead, Calif., Oct. 19, 2012 — Southern California Edison (SCE) has begun required equipment testing using a temporary boiler to produce steam required in the non-nuclear portions of the San Onofre Nuclear Generating Station. This testing is not part of a plant restart.

The current testing is required for Unit 2 upgrades completed this past January, which included installing a new reactor vessel head. During this testing, steam might be visible on the west side of the plant. The temporary boiler is being run on diesel fuel.

The testing is anticipated to last about seven days. During this period, the reactor cooling water system will pump water through its normal flow path. The pumping energy will heat up and pressurize the reactor water to normal levels.

These conditions are necessary to conduct the planned testing of the new equipment. In accordance with the requirements of the Nuclear Regulatory Commission’s (NRC) Confirmatory Action Letter, the reactor will remain shut down and the steam generators will not be producing steam to run the power plant.

Both units of the San Onofre plant are currently safely shut down. Unit 2 was taken out of service Jan. 9 for a planned outage. Unit 3 was safely taken offline Jan. 31 after station operators detected a leak in a steam generator tube.

SCE submitted its response to the NRC’s Confirmatory Action Letter on Oct. 4, along with its restart plan for Unit 2. Unit 2 cannot be restarted until all plans have been approved by the NRC and will remain shut down until the NRC is satisfied that it is safe to operate. Unit 3 remains safely shut down for continued inspections, analysis and testing.

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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.


Southern California Edison Conducts Required Testing of Equipment