The reactor was a Westinghouse Electric Corporation-built naval reactor power plant, installed in the Naval Reactors Facility in the desert at the Idaho National Engineering Laboratory near Arco, Idaho. It first operated in October 1958. This reactor plant consisted of two reactors, A1W-A and A1W-B, operated in tandem so that the steam produced by both reactors was used to power one turbine connected to a drive shaft. Since the purpose of A1W prototype was to simulate the USS Enterprise at sea it was also possible to divert the steam to two 'Dump Condensers' that simulated launching aircraft. Also, the electricity generated by the Main Engine was dissipated by immersing three electrodes in a pool of water. This was done to simulate load. In the early 70's the A1W-B core was replaced with 1/4 of the USS Nimitz core for testing.