Improved Algorithm Based on Equivalent Enthalpy Drop Method of Pressurized Water Reactor Nuclear Steam Turbine

Because it is difficulty to accurately determine the extraction steam turbine enthalpy and the exhaust enthalpy,the calculated result from the conventional equivalent enthalpy drop method of PWR nuclear steam turbine is not accurate.This paper presents the improved algorithm on the equivalent enthalpy drop method of PWR nuclear steam turbine to solve this problem and takes the secondary circuit thermal system calculation of 1000MW PWR as an example.The results show that,comparing with the design value,the error of actual thermal efficiency of the steam turbine cycle obtained by the improved algorithm is within the allowable range.Since the improved method is based on the is entropic expansion process,the extraction steam turbine enthalpy and the exhaust enthalpy can be determined accurately,which is more reasonable and accurate compared to the traditional equivalent enthalpy drop method.