SEFOR is a deactivated experimental fast breeder reactor located in Cove Creek Township

Cove Creek Township, Washington County, Arkansas

Township of Cove Creek is one of thirty-seven townships in Washington County, Arkansas, USA. As of the 2000 census, its total population was 683. Part of Devil's Den State Park is located in Cove Creek Township.-Geography:...

, Washington County

Washington County, Arkansas

Washington County is a county located in the northwest part of the U.S. state of Arkansas. As of 2010, the population was 203,065. The county seat is Fayetteville. Washington County is Arkansas's 17th county, formed on October 17, 1828, and named for George Washington, the first President of the...

, near West Fork

West Fork, Arkansas

West Fork is a city in Washington County, Arkansas, United States. The population is 2,317 at the 2010 census. It is part of the Fayetteville–Springdale–Rogers, AR-MO Metropolitan Statistical Area.-Geography:...

, in northwest Arkansas

Arkansas

Arkansas is a state located in the southern region of the United States. Its name is an Algonquian name of the Quapaw Indians. Arkansas shares borders with six states , and its eastern border is largely defined by the Mississippi River...

 (twenty miles sw of Fayetteville, Arkansas

Fayetteville, Arkansas

Fayetteville is the county seat of Washington County, and the third largest city in Arkansas. The city is centrally located within the county and is home to the University of Arkansas. Fayetteville is also deep in the Boston Mountains, a subset of The Ozarks...

). 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.