A dynamic model of a U-tube steam generator for the DSNP simulation language

A U-tube steam generator (UTSG) model, developed for the Dynamic Simulator for Nuclear Power Plants (DSNP) simulation language package is described. The model is intended to predict the behavior of UTSG variables during transients that are as severe as those which may be anticipated during normal power plant operation, while maintaining those features which make DSNP an attractive simulation tool; namely economy in computer execution time and man-hour investment per simulation. The UTSG theoretical modeling and the solution method are discussed in detail. Example simulation results are presented, and comparisons with an independently developed UTSG model are made. The simulations performed to date indicate that the developed UTSG model adequately predicts the dynamic behavior of important UTSG variables during transients within the scope of currently available DSNP component models. The model represents a UTSG both realistically and economically in a spectrum of transient simulations