Cycle Thermal Efficiency Analysis Model And Application Research Of Nuclear Power Unit Under Disturbances

At present, the thermal economic analysis methods for secondary-circuitthermodynamic system of PWR nuclear power plant exit some shortages such as largecalculation quantities and poor generality. Based on the foundation of MSR been regardedas a special heater, the paper constructs the generalized matrix model for secondary-circuitthermodynamic system analysis of PWR nuclear power plant, it considers the steam-waterdistribution of secondary-circuit thermodynamic system comprehensively. It summarizesthe rules for filling out the matrix, and each matrix has an explicit physical sense. Thismethod is applied for a secondary-circuit thermodynamic system of Daya Bay NuclearPower Station and a thermodynamic system of the200MW unit. The results indicate thatthis method is as correct as the traditional heat balance method. It is versatile, intelligentand suitable for computerization, and also provides a simple and effective method tocalculate the thermal economy of nuclear power plant.Based on the general model of thermal economic analysis for secondary-circuitthermodynamic system of PWR nuclear power plant and the aid of differential theory, thepaper constructs a calculation model about the influence of five disturbances on thermaleconomy, including auxiliary steam-water flux, heater terminal temperature difference,extraction steam pressure loss, heat loss and condensate super-cooling. Meanwhile， acalculation model about heater terminal temperature difference and extraction steampressure loss change in the same time is established. This model is based upon deviationfactor matrix. This method is applied for a secondary-circuit thermodynamic system ofDaya Bay Nuclear Power Station a thermodynamic system of the200MW unit. The resultsindicate that the relative error between this method and the traditional heat balance methodis minimal. It provides a simple and effective method to calculate the influence ofdisturbances on thermal economy of nuclear power plant.