The objective of this paper is to provide a RELAP5 model of the heater drain system of a BWR. Most water driven turbine power plants have comparable systems. The purpose of the RELAP5 model is to simulate and evaluate operational transients in the heater drain system so evaluations of the system can be performed. Other possible uses of this model are for reactor simulator support, for support to operations in determining what if scenarios during operation and for supporting plant engineering in changing and modifying the system for optimum operation.

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