About: Zero Power Physics Reactor

The Zero Power Physics Reactor or ZPPR (originally named Zero Power Plutonium Reactor) was a split-table-type critical facility located at the Idaho National Laboratory, Idaho, USA. It was designed for the study of the physics of power breeder systems and was capable of simulating fast reactor core compositions characteristic of 300-500 MWe demonstration plants and 1000 MWe commercial plants. ZPPR ran only at extremely low power, for testing nuclear reactor designs. ZPPR was operated as a critical facility from April 18, 1969 until 1990.