一、前言发展核电站是开发能源的重大措施之一。纵观世界各国,特别是工业发达的国家,早将核能发电作为发展电力的重要途径。到七十年代末,世界上已建成约250座核电站,其中大部分为压水堆型。蒸汽发生器是压水堆核电站的核心组件之一。据统计,平均每年近40%的堆需要停堆检修,其主要原因就是蒸汽发生器的传热管因应力腐蚀破裂、酸性磷酸盐的腐蚀等事故而需要堵 I. Preface The development of nuclear power plants is one of the major measures for energy development. Throughout the world, especially in developed countries, nuclear power generation as early as an important way to develop electricity. By the end of the 1970s, about 250 nuclear power plants have been built in the world, most of which are of the pressurized water reactor type. Steam generator is one of the core components of PWR nuclear power plant. According to statistics, an average of nearly 40% of the heap need to be shut down for maintenance each year, the main reason is that the steam generator heat pipe due to stress corrosion cracking, acid phosphate corrosion and other accidents need blocking