1963 Waste Calcining Facility The firstWaste Calcining Facility and the adjacent Calcined Solids Storage Facility began operations, revolutionizing the management of liquid radioactive waste. 1967 AdvancedTest Reactor ATR first reached criticality on July 2, 1967, and reached its full 250-megawatt power level in August 1969, becoming the largest test reactor in the world. 1966 EBR-I Becomes National Historic Landmark EBR-I was dedicated as a National Historic Landmark on Aug. 26, 1966. 1966 Reactor Excursion and Leak Analysis Program Idaho scientists began developing reactor safety analysis software to model reactor coolant and core behavior in a pressurized water reactor. 1972 Power Burst Facility Reactor The PBF was part of reactor safety testing that started with the SPERT program. 1975 Hot Fuel Examination Facility The flagship facility for conducting post-irradiation examination of fuels and materials began operations. 1986 Integral Fast Reactor Demonstration IFRfuelwassuccessfullytestedinEBR-II. Whenoperatorssimulatedfailuresthatcaused meltdownsatChernobylandThreeMileIsland, thereactorshutitselfdownsafely. 1968 Semiscale‘Blowdown’Tests “Blowdown”tests and computer analysis of the simulated accidents led to the formulation of computer codes that could predict the performance of backup cooling systems during a loss-of-coolant accident. 1969 Zero Power Physics Reactor The ZPPR was a low-power physics reactor that provided physics data for any type of fast neutron spectrum reactor. 1973 Loss of FluidTest Facility The LOFT reactor was a critical resource in the safety testing program for commercial power reactors.