Rancho Seco Nuclear Generating Station was located in Herald, California approximately 25 miles southeast of Sacramento. The Babcock & Wilcox PWR was owned by Sacramento Municipal Power District. The plant was shutdown in June 1989. Decommissioning activities began in early 1997 and have been completed with the exception of Class B and C low-level radioactive waste that is being stored in an Onsite Storage Building until a suitable disposal facility becomes available and the SNF being stored at the ISFSI. The cooling towers have been abandoned in place and remain on site today.
The SNF from Rancho Seco was transferred to the on-site ISFSI beginning in June 2000 and completed in August 2001 pursuant to a site specific license. The ISFSI consists of a single concrete pad (about 130 feet by 200 feet) approximately 900 feet west of the cooling towers and enclosed by two security fences. There are 493 SNF assemblies (228 metric tons) stored in 21 dry casks. The casks are manufactured by Transnuclear – the NUHOMS cask system and the 24PT canister type. Additional information regarding Rancho Seco is available at the following website: