Maine Yankee Atomic Power Plant is located in Wiscasset, Maine. The Combustion Engineering PWR was operated by Maine Yankee Atomic Power Company until August 1997 when it was shutdown. Decommissioning began immediately and was completed in the spring of 2005. Maine Yankee Atomic Power Company is owned by 9 different utilities: Central Maine Power Co. (38%); New England Power Co. (24%); Connecticut Light & Power Co. (12%); Bangor Hydro-electric (7%); Public Service Co. of New Hampshire (5%); Maine Public Service Co. (5%); NStar Electric Co. (4%); Western Massachusetts Electric Co. (3%); and Central Vermont Public Service Corp. (2%).
The ISFSI for Maine Yankee is a 12-acre facility containing 16 concrete storage pads and an adjacent security and operations building. Transfer of the SNF from the fuel pool to the ISFSI began in August 2002 and was completed in February 2004. There are 1,434 SNF assemblies stored in 60 dry casks. In addition, there are 4 dry casks used for the storage of greater-than-class-c waste (mainly irradiated steel from the plant’s reactor vessel). The casks are manufactured by NAC International — the NAC-UMS cask system and the UMS-24 canister type. There are 542 metric tons of SNF stored at the ISFSI for Maine Yankee.