SEFOR was an experimental fast breeder reactor located in Cove Creek Township, Washington County, near Strickler, in northwest Arkansas. The site consisted of a 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 in 1975, but it never happened. The University maintained the decommissioned site until finally receiving federal funds to dismantle the facility in 2016, which completed in 2019.