Comment Re:"ALI" of it? (Score 1) 54
Say your reactor has a neutron injector on a rotor. The fission fuel has started vibrating, creating a feedback loop that could cause the reaction to become unstable. Running the rotor in reverse would change the pattern of incident neutrons just enough to stop the vibration. And the way you make a rotor go the other way is by reversing the polarity of its drive current.
That's the best that I could ground this technobabble off the top of my head.