Analysis of information sources in references of the Wikipedia article "Nuclear thermal rocket" in English language version.
Preliminary designs had been selected but no prototype components had been tested before the program was canceled. No system was ever launched.
Past NERVA research found that graphite composite fueled engines exhibited unwanted erosion and cracking
Preliminary designs had been selected but no prototype components had been tested before the program was canceled. No system was ever launched.
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: CS1 maint: multiple names: authors list (link)The first tests of nuclear rockets started in 1955 with Project Rover at the Los Alamos Scientific Laboratory. The key development was miniaturizing the reactors enough to be able to put them on a rocket. Over the next few years, engineers built and tested more than a dozen reactors of different sizes and power outputs.
Preliminary designs had been selected but no prototype components had been tested before the program was canceled. No system was ever launched.