(ATR) is the world’s premier nuclear test reactor. It provides unmatched, national priority nuclear fuel and materials testing capabilities for military, federal, university and industry partners and customers.

INL’s nuclear research capabilities rely heavily on ATR, located at the ATR Complex on the INL Site, 47 miles west of Idaho Falls.

As the national laboratory for the U.S. Department of Energy’s Office of Nuclear Energy (DOE-NE), INL serves a key role in U.S. nuclear energy research initiatives and programs, such as the National Reactor Innovation Center.