How ORNL's Molten Salt Reactor Experiment shaped modern advanced reactors

Feb 19, 2026

ORNL guests traced the laboratory's role from the 1943 graphite reactor through the Molten Salt Reactor Experiment (MSRE), noting MSRE criticality in 1965, uranium-233 operation later in the 1960s, and the experiment's influence on current molten salt and advanced-reactor work.

The full story

On its Sound of Science podcast, Oak Ridge National Laboratory staff and guests recounted the laboratory's early reactor research and the legacy of the Molten Salt Reactor Experiment (MSRE), which they said helped define advanced-reactor research in the United States.

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