The San Onofre Nuclear Generating Station under construction in San Diego County, California

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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. It had a spherical containment of concrete and steel the smallest wall was 6 feet (1.8 m) thick. It generated 456 MWe gross, and 436 MWe net, when operating at 100% capacity.