WBussard ramjet
WDirect Fusion Drive
WFusion rocket
WHelios (propulsion system)
WProject Longshot
WNERVA
WNuclear lightbulb
WNuclear power in space
WNuclear pulse propulsion
WNuclear thermal rocket
WProject Orion (nuclear propulsion)
WProject Daedalus
WProject Prometheus
WPulsed nuclear thermal rocket
WProject Rover
WTEM (nuclear propulsion)