Definition of "nonfissionable" [nonfissionable]

• Not fissionable (adjective)

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• "Ninety-five percent of a spent fuel rod is plain old U-238, the nonfissionable variety that exists in granite tabletops, stone buildings and the coal burned in coal plants to generate electricity."
• "In 1940 Urey was put in charge of separating out fissionable uranium-235 from nonfissionable uranium-238."
• "The pile feeds on slugs of Uranium-238, which is nonfissionable."