![]() It generated 456 MWe gross, and 436 MWe net, when operating at 100% capacity. It had a spherical containment of concrete and steel the smallest wall was 6 feet (1.8 m) thick. Unit 1, a first-generation Westinghouse pressurized water reactor that operated for 25 years, closed permanently in 1992 it has been dismantled and is used as a storage site for spent fuel. Reactors Unit 1 in 1975 Units 2 and 3 in 2012 Actual decommissioning will take many years until completion." Controversy continues over Edison's plans for on-site dry cask storage of the considerable amount of nuclear waste created during the facility's decades of operation. The company stated that "Full retirement of the units prior to decommissioning will take some years in accordance with customary practices. In June 2013, Southern California Edison announced the permanent retirement of Unit 2 and Unit 3, citing "continuing uncertainty about when or if SONGS might return to service" and noting that ongoing regulatory and "administrative processes and appeals" would likely cause any tentative restart plans to be delayed for "more than a year". In May 2013, Senator Barbara Boxer, the then-chairman of the Senate Environment and Public Works Committee, said the modifications had proved to be "unsafe and posed a danger to the eight million people living within 50 miles of the plant," and she called for a criminal investigation. The Nuclear Regulatory Commission investigated the events that led to the closure. Upgrades designed to last 20 years were made to the reactor units in 20 however, both reactors were shut down in January 2012 after premature wear was found on more than 3,000 tubes in replacement steam generators that had been installed in 20. Unit 2 was started in 1983 and Unit 3 started in 1984. The plant's first unit, Unit 1, operated from 1968 to 1992. Located between the ocean and Interstate 5, the station is a prominent landmark because of its twin hemispherical containment buildings, which were designed to contain any fission products in the event of an incident. When fully functional, it employed over 2,200 people. Edison International, parent of SCE, holds 78.2% ownership in the plant San Diego Gas & Electric Company, 20% and the City of Riverside Utilities Department, 1.8%. The plant is owned by Southern California Edison. The 2.2 GW of electricity supply lost when the plant shut down was replaced with 1.8 GW of new natural-gas fired power plants and 250 MW of energy storage projects. ![]() The plant was shut down in 2013 after defects were found in replacement steam generators it is currently in the process of decommissioning. The San Onofre Nuclear Generating Station ( SONGS) is a permanently closed nuclear power plant located south of San Clemente, California, on the Pacific coast, in Nuclear Regulatory Commission Region IV.
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