to start the chain reaction, all we need is one neutral. i think you can see what is going to happen. watc watch. >> my first introduction to nuclear power was quite nice. it was a disney movie called "our friend the atom." the atom was going to bring about a wonderful revolution in the way we got our energy. and i was in a nuclear power submarine and us kids were enthusiastic about that and then when i was in myerly teens, i heard a speech and my dad knew i was interested in science, so he took he. >> watch the control rods come out as the control rods come out, the reactor starts.