Rancho Seco Nuclear Generating Station

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Rancho Seco PWR reactor hall and one of two cooling towers
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Rancho Seco PWR reactor hall and one of two cooling towers

Rancho Seco Nuclear Generating Station is a decommissioned nuclear power plant in Clay Station, California. It was built by the Sacramento Municipal Utility District. This 2772 MWt Babcock and Wilcox pressurized water reactor (913 MWe) achieved initial criticality on September 16, 1976, and entered commercial operation on April 17, 1977.

Rancho Seco operated from April 1975 to June 1989 but it had a lifetime capacity average of only 39%. It was closed by public vote on June 6, 1989 after multiple referendums and the promise of ten years of subsidized power from the Diablo Canyon power plant. Decommissioning activities are underway as of 2005. The cooling ponds and grounds are now being used as a public park, managed by the California Department of Water Resources.

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