They have completed designs using low enriched Uranium. They're not quite as elegant or as small, but they should work fine. https://fas.org/nuke/space/leu-re

They have completed designs using low enriched Uranium. They're not quite as elegant or as small, but they should work fine. https://fas.org/nuke/space/leu-reactor.pdf https://fas.org/nuke/space/leu-reactor.pdf