Low Enriched Uranium Nuclear Thermal Propulsion – Beyond NERVA

NASA is currently exploring new options for nuclear thermal propulsion, moving away from the highly enriched uranium graphite composite fuel used in the NERVA program. See what NASA is doing with new materials and designs for crewed missions to Mars! Where We've Been Before CERMET Fuel: The Means to Reduce Enrichment NASA's New NTP Spacecraft!

Beyond NERVA – Nuclear Power for Solar System Exploration

Nuclear Thermal Propulsion: Old Technology, Renewed Purpose

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Potential Testing and Space Applications of Nuclear Thermal Rockets

Innovative concept for an ultra-small nuclear thermal rocket utilizing a new moderated reactor - ScienceDirect

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Innovative concept for an ultra-small nuclear thermal rocket utilizing a new moderated reactor - ScienceDirect

Elon replies to a KSP post about nuclear thermal engines : r/SpaceXLounge

Nuclear Thermal Propulsion – Beyond NERVA

NASA Is FINALLY Building A Nuclear Engine

LEU NTP, NASA's New Nuclear Rocket – Part 1: Where We've Been Before – Beyond NERVA

PPT - GOING TO MARS WITH NUCLEAR THERMAL PROPULSION PowerPoint Presentation - ID:164409

PDF) Numerical investigation of heat transfer characteristics of moderator assembly employed in a low-enriched uranium nuclear thermal propulsion reactor

NERVA - Wikipedia