Before revision: Concept In a traditional power-generating nuclear reactor, the nuclear fuel is arranged in such a way that the two or three neutrons released from a fission event will lead to one other atom in the fuel also undergoing fission.
After revision: Concept In a traditional power-generating nuclear reactor, the nuclear fuel is arranged in such a way that the two or three neutrons released from a fission event will induce one other atom in the fuel to fission.