A nuclear propulsion unit was a form of sublight propulsion technology employed aboard Elasian ships during the mid-23rd century.

When the Elasians toured engineering section aboard the USS Enterprise in 2268, Chief Engineer Scott stated "our impulse engines must seem fast compared to your nuclear propulsion units," while attempting to evade why the ship was not utilizing its warp drive. (TOS: "Elaan of Troyius")

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