subcritical
adjective
sub·crit·i·cal
ˌsəb-ˈkri-ti-kəl
1
: less or lower than critical in respect to a specified factor
2
a
: of insufficient size to sustain a chain reaction
a subcritical mass of fissionable material
b
: designed for use with fissionable material of subcritical mass
a subcritical reactor
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Merriam-Webster unabridged
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