Abstract:By calculating the thermal resistance of the primary loop,the secondaryloop，the tube wall,the fouling resistance,the heat transfer coefficient ofsteam generators for AP1000,the Daya Bay Nuclear Power Plant and Qinshan Nuclear Power Plantare calculatedand the results are analyzed by comparing with each other.The data shows thatthe heat transfer coefficient of the AP1000 steam generator is 8978W/(m2·℃), which is slightly larger than that of the Daya Bay’s and Qinshan’s.Meanwhile，the secondary loop of AP1000 SG has the minimum thermal resistance of the three,but the thermal resistance of the primary loop,fouling resistance and thermal resistance values of the wall tube are
basically equal to those of Daya Bay,and both are superior to the corresponding values of Qinshan.The heat resistance of the tube wall account for more than 50% of the general heat resistance.Overall,the designs of each part of AP1000 steam generator are more reasonable，compared to the second generation of the steam generator，which improves its heat transfer characteristics.
