The Naval Reactors Facility (NRF) is located 52 miles northwest of Idaho Falls, Idaho. The NRF is a United States Department of Energy-Naval Reactors facility where three nuclear propulsion prototypes A1W, S1W and S5G were located. It is contractor-operated for the government by (FMP), which also operates Bettis Atomic Power Laboratory and Knolls Atomic Power Laboratory. The only remaining active facility at NRF is the Expended Core Facility / Dry Storage Facility, which provides for storage of spent fuel from U.S. Naval reactors. NRF is part of the Idaho National Laboratory.