Experimental Breeder Reactor 1, or EBR-1, was the first of 52 nuclear reactors built at the National Reactor Testing Station, now the Idaho National Laboratory. It was the first reactor in the world to generate a usable quantity of electricity in 1951. In 1966, two years after it was replaced by a larger, more advanced version, EBR-1 was
dedicated as a Registered National Historic Landmark.Also on display at EBR-1 is a small physics testing reactor, as well as two reactors built in the 1950's as possible power sources for a nuclear airplane.