Oconee Nuclear Station Units 1, 2 and 3 are located in Seneca, South Carolina approximately 30 miles west of Greenville, South Carolina.  The Babcock & Wilcox PWRs are operated by Duke Power and owned by Duke Energy Corp.  Unit 1 is licensed to operate until February 6, 2033.  Unit 2 is licensed to operate until October 6, 2033.  Unit 3 is licensed to operate until July 19, 2034.

The ISFSI for Oconee began accepting SNF from all three units in 1990 pursuant to a site-specific license.  The site-specific license authorizes a total of 88 storage modules; however, only 40 modules in two 2 x 10 arrays were built (shown in the back left of the photo).  There are 960 SNF assemblies stored in 40 dry casks under the site-specific license.  In 1997 Oconee obtained a general license ISFSI and has been using it since for storage.  As of February 2012, there are 1,992 SNF assemblies stored in 83 dry casks under the general license (shown in the front left and back right of the photo).  All the casks are manufactured by Transnuclear — the NUHOMS cask system and the 24P canister type.

The entire ISFSI is located inside the Oconee security perimeter, approximately 1000 feet southwest of the Unit 2 reactor building and approximately 100 feet west of the condenser cooling water intake structure.  It is the largest commercial ISFSI in the United States.  As of February 2012, there were 2,952 SNF assemblies stored in 123 dry casks.  As of the end of 2010, there was 3,900 metric tons of SNF stored at the three nuclear power plant sites located in the State of South Carolina — Catawba, Oconee, Robinson and Summer.