Pluto Reactor Fast Spectrum Plutonium Criticality Experiment

under testing

Oklo Inc. conducted a multi-day plutonium fast reactor critical test suite with Los Alamos National Laboratory at the National Criticality Experiments Research Center. The experiment involved low-power tests on the Flattop fast-spectrum critical assembly to capture reactivity feedback and power response measurements, demonstrating safety features of a plutonium-fueled fast-spectrum system. This campaign supports the development and qualification of surplus plutonium as fuel for commercial advanced reactors and contributes to the design and safety basis of Oklo's Pluto fast test reactor.