SEFOR (Southwest Experimental Fast Oxide Reactor) is a deactivated experimental fast breeder reactor located in Cove Creek Township, Washington County, near West Fork, in northwest Arkansas (twenty miles sw of Fayetteville, Arkansas). The site consists of a deactivated 20-Megawatt (thermal), Sodium-Cooled Test Reactor, a Shop Building, an Operations Building, a Maintenance Shed, and an Electrical Transformer yard. It operated from 1969 to 1972 when the program ended. It was then acquired by the University of Arkansas, in hopes that it could be used as a research facility. However that never happened and the university has been paying $50,000 in maintenance fees yearly since.