NTP ideally should be tested here on Earth before going into space. The propellant in that "P" is, then, wasted. For salvaging that at the lab, and reusing it: here is a Penn State simulation.
The Nittany Lions are looking at hydrogen at 1475 K. I don't know why the press-release is going Fahrenheit. I also don't know why not ammonia. Although, yes, 1475 K is low-temperature compared to some, so a HALEU option. Ultra Safe's option no less...
Hydrogen has proven not to bunch itself up in the "test loop" - so the testers did get to reuse their propellant. I get the feeling that nuclear-heated propellants aren't as dangerous as chemically-detonated propellants.
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