LUPO - A PROGRAM FOR PREDICTION OF STEADY-STATEnTEMPERATURE, FLOW RATE AND PRESSURE DROPS IN A CLOSEDnPRESSURIZED WATER LOOP WITH OR WITHOUT BOILING

摘要

A method is described for predicting steady-state bulk fluid tempe¬rature, void fraction, pressure drops and mass flow rate in a closed pressurized water loop, operating at forced or natural circulation. The model treats the one-dimensional transfer of mass, momentum and energy through¬out the whole liquid, subcooled boiling and bulk boiling regions of the coolant using semiempirical heat transfer and pressure drop correlations developed by other investigators. A representation of subcooled boiling, based upon the model proposed by Bowring in HPR-10. is used.nVariations in heat transfer and hydraulic characteristics of the coolant due to changes in temperature and state are handled by conti¬nuously calculating local values of thermodynamic and physical properties (specific heat, density, quality, viscosity, thermal conductivity, etc.).