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This paper describes the problem of simulating nuclear reactor start-up with an electronic analog computer. The reactor kinetic equations are discussed and the range that their solution must cover is defined. Source range simulation and alternate methods of simulating the intermediate range are presented. The use of reactor period signal in the intermediate range is described. In the power range, which includes a representation of the heating and temperature effects, the inherent advantages of a pressurized water reactor are outlined. The portion of the start-up simulation which applies to nuclear reactors in general is summarized. The areas of modification necessary for the simulation of other than pressurized water reactors is outlined.