Naval Reactors Facility (NRF) is located 52 miles northwest of Idaho Falls. 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 Bechtel Marine Propulsion Corporation (BMPC), 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.