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In page Nuclear salt-water rocket:

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For example, Zubrin argues that if diluted nuclear fuel flows into the chamber at speed similar to diffusion speed of thermal neutrons, then the nuclear reaction is confined in the chamber and does not damage the rest of the system (the nuclear analog of a gas burner). A possible problem in that line of thinking is that neutrons do not all diffuse at the same velocity, but have a broad distribution over several orders of magnitude. It is possible that tails of this velocity distribution would be sufficient to generate enough heat in fuel feeding system (by scattering and fission) to destroy the system.[citation needed] This question can be perhaps answered by detailed Monte Carlo simulations of neutron transport.