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....nuclear powered submarines are cool, they are slow and in the ocean...what's gonna happen, they sink to the bottom or something,
The first operating nuclear-powered jet engine was a General Electric modified J-47 turbojet. The first test of the design was a ground test of an assembly called the Heat Transfer Reactor Experiment no. 1. Later, a two-engine assembly was also successfully tested on the ground. The reactor was placed in a horizontal configuration and operated for more than 120 hours, including 65 continuous hours. [Source: Nuclear News, "Jet Engine Runs on Atomic Power", Oct-Nov 1960
They have produced and tested nuclear powered planes. The only problem was sheilding the crew from radiation!