Binding Energy is the Energy released or used when an Atom is formed or broken respectively Difference in Binding Energy = 0.9 Mev 235 nucleons in 1 atom of Uranium235 x 0.9 Mev = 211.5 MeV per Event 210 MW is 210 x 106 Joules per second Converting MeV to Joules ( multiply by 1.6 x 10-13 ) = 3.384 x 10-11 Joules Energy per second divided by Energy per event gives the number of event required per second to produced this energy, which is 6.2 x 1018