b'P ROVING THE P RINCIPLEReactorLast Day of Name Acronym S t a r tup Operation 24. Heat Transfer Experiment No. 3 HTRE-3 1958 December After substantial testing and experimentation, this new experiment arranged the reactor, engine,1960shielding, and heat transfer systems in a horizontal configuration anticipating final design in an airframe.President John F. Kennedy canceled the ANPprogram on March 28, 1961. Work on the project came to an abrupt and permanent end on that date. The two HTRE experiments were moved to the site of EBR-I, where they are on display at the visitors center.(See Heat Transfer Experiment No. 1)25. High Temperature Marine Propulsion Reactor 630-A 1962 1964The 630-Areactor, a low-power critical experiment, was operated at TAN to explore the feasibility of an air-cooled, water-moderated system for nuclear-powered merchant ships. Further development was discontinued in December 1964 when decisions were made to lower the priority of the entire nuclear power merchant ship program.26. Hot Critical Experiment HOTCE 1958 3-28-61HOTCE was an elevated-temperature critical experiment designed to obtain information on temperature(End of ANPcoefficients of solid-moderated reactors, to develop a theory consistent with this information, and to developprogram)measurement techniques for high-temperature reactors. A part of the ANPprogram, it operated in the Critical Experiment cell of the Low Power Test Facility at TAN. HOTCE was one of three low-power reactors supporting the ANPprogram, along with the Shield Test Pool Facility Reactor (see below) and the Critical Experiment Tank (CET). The ANPprogram ended in 1961.27. Large Ship Reactor A A1W-A 10-21-58 1-26-9428. Large Ship Reactor B A1W-B July 1959 1987The A1W(aircraft carrier, first prototype, Westinghouse) plant consisted of a pair of prototype reactors for USS Enterprise, a U.S. Navy nuclear-powered aircraft carrier. Located at the Naval Reactors Facility,the two pressurized-water reactors (designated Aand B) were built within a portion of a steel hull. The plantsimulated Enterprisesengine room. All components could withstand seagoing use.The A1Wplant was the first in which two reactors powered one ship propeller shaft through a single-geared turbine propulsion unit. As the Navy program evolved, new reactor cores and equipment replaced many of the original components. The Navy trained naval personnel at the A1Wplant and continued a test program to improve and further develop operating flexibility.29. Lost of Fluid Test FacilityLOFT 1973 7-9-85The LOFTreactor, located at TAN within a containment building, was a centerpiece in the safety testing program for commercial power reactors. The reactor was a scale-model version of a commercial pressurized-water power plant built chiefly to explore the effects of loss-of-coolant accidents (LOCAs).Thirty-eight nuclear power tests were conducted on various accident scenarios, including the real accident at Three Mile Island, between 1978 and 1985. Among other goals, the program investigated the capability of e m e rgency core cooling systems to prevent core damage during a LOCA. Experiments at LOFT simulated small-,medium-, and large-break LOCAs, sometimes complicated with other events such as loss of offsite power.LOFT was inactivated in 1986, following completion of the LP-FP-2 experiment, the most significant severe-fuel-damage test ever conducted in a nuclear reactor.This test, which involved the heating and melting of a 100-rod experimental fuel bundle, provided information on the release and transport of fission products that could occur during an actual commercial reactor accident where core damage occurs.30. Materials Test Reactor MTR 3-31-52 4-23-70The MTR was the original reactor at the Test Reactor Area and the second reactor operated at the NRTS. Fueled with enriched uranium fuel, water-cooled and -moderated, the reactor was a key part of the Atomic Energy Commissions post-war reactor development program. It supplied a high neutron flux in support of a reactor development program subjecting potential reactor fuels and structural materials to irradiation. In 264'