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一体化压水堆的设计是将蒸汽发生器及稳压器等一回路所有部件都放入压力容器内，以提高安全性。采用可以精确模拟直流蒸汽发生器二次侧水的饱和点、蒸干点位置等重要参数随时间变化的可移动边界差分法，选用适合各种换热工况的一整套换热关系式，建立了可以模拟一体化压水堆直流蒸汽发生器的稳态及瞬态热工水力特性的物理及数学模型，并编制了计算程序。经对Ｂａｂｃｏｃｋ和Ｗｉｌｃｏｘ公司１９管直流蒸汽发生器实验装置进行的计算表明：本程序的计算结果与相应的实验数值及其它计算程序的计算结果相比较，符合很好。
Integrated pressurized water reactor is designed to steam generator and voltage regulator, such as a loop all the components are placed in the pressure vessel, in order to improve safety. Adopting the movable boundary difference method which can exactly simulate the time-varying of the important parameters such as the saturation point and the position of the desiccation point of the secondary water of the direct-flow steam generator, a set of heat exchange relations suitable for various heat exchange conditions is selected to establish The physical and mathematical models that can simulate the steady-state and transient thermal-hydraulic characteristics of an integrated PWR DC steam generator were developed and a calculation program was developed. The calculation of the experimental device of 19-tube DC steam generator manufactured by Babcock and Wilcox Company shows that the calculation results of this program are in good agreement with the corresponding experimental values and the calculation results of other calculation programs.