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Obviously there's the problem of testing such an engine. You'd be ejecting uranium fission products into the environment, making it extremely dangerous for any people nearby and doing significant damage to any wildlife present. But are there any other factors that would make making a nuclear salt-water rocket difficult?

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    $\begingroup$ I feel that your question is probably best inverted. "What are the easy bits of building nuclear salt water rockets?", which leads to simple and straightforward answers like "we've given it a name already" and "we know how to manufacture the fuel" because literally everything else is hideously difficult. I mean, seriously. Steady state exploding nuclear fluid flow? $\endgroup$ Aug 2 at 8:04
  • $\begingroup$ I am skeptical as to whether the principle of the nuclear salt water rocket has actually been thought out very well, and many descriptions of it seem like "toy models". For the higher performance versions (i.e. performance substantially in excess of well-studied and plausible GCNR designs) one wonders if the heat dissipation issue can actually be resolved at all. $\endgroup$
    – ikrase
    Aug 2 at 9:43
  • $\begingroup$ Why do you need other factors? $\endgroup$
    – gerrit
    Aug 2 at 12:07

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