Thermodynamic system analyse and evaluate for steam turbine of unclear power plant

In the process of turbine bid assessment for steam turbine of nuclear projects, there were problems with the scheme of thermal system provided by suppliers due to mistakes or commercial interests, such as unreasonable preferences and incorrect calculation methods, etc. A kind of calculation method for steam enthalpy values of stages with partly drains and completely drains was presented in this paper, and power was chosed to evaluate efficiencies which was more precise and closer to the truth compared with enthalpy drop, also performance indicators such as ideal power, equivalent flow and ideal enthalpy drop were gived and applied for analysis and evaluation of the scheme, which made the errors revealed promptly and looked after owner's interests. The method was also applied for calculating and analysis of thermal system of steam turbine for in-service nuclear power station, and revealed some problems and gived the solutions. (authors)