nonfissionable

/nɑnˈfɪʃənəbəl/
adjective
  1. Not able to be split by nuclear fission; not suitable for use in a nuclear chain reaction.
    • The nonfissionable waste was stored in a secure underground facility.
    • Scientists identified the element as nonfissionable under normal reactor conditions.
    • The safety manual listed which isotopes are nonfissionable and require special handling.
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