SCE upgrades San Onofre nuclear plant

Rosemead, Calif., January 10, 2012 — Southern California Edison temporarily removed from service one of the two large generating units at its San Onofre Nuclear Generating Station — Unit 2 — for a scheduled refueling and maintenance outage.

During the outage SCE will continue its practice of upgrading plant hardware and systems when it is possible to enhance the safety, reliability or customer cost-effectiveness of the plant.

Since the last Unit 2 outage concluded April 11, 2010, the 1,100-MW generator has provided utility customers with power 24/7, with the exception of a precautionary three-day shutdown in September 2011 a grid disturbance caused.

During this latest 21-month run the unit has contributed more than 16 billion kWh to customer electricity needs. Nineteen percent of all power Edison customers use comes from nuclear generation.

Plans for the outage, and a similar Unit 3 outage scheduled for this fall, include replacing the reactor heads of both units and retrofitting the high-pressure turbines with new rotating and static components.

The new high-pressure turbine components SONGS plans to install during 2012 will increase the plant’s efficiency and generating capacity. The design and construction of the new reactor heads, including the use of single forge manufacturing that features fewer welds, will be even safer, while reducing customer costs by shortening maintenance outages.

The planned upgrades will cost about $280 million, and will have a net positive economic benefit for customers during the current license period. The cost impact on customers will be roughly 0.5 percent of total current rates.

Each of the 2012 outages will create about 1,700 temporary jobs.

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