中小型压水堆在核电发展初期在掌握技术、积累经验方面曾起过重要作用,在核发供电方面至今仍在发挥作用。与第二代大型机组相比,早期中小型压水堆设计裕度留得较多,安全性略优于大型堆,而且建造周期短,运行负荷因子高,总的经济性与大堆相 Small and medium-sized pressurized water reactors played an important role in mastering technology and gaining experience in the early stage of nuclear power development and still play a role in the issuance of power supply. Compared with the second-generation large-scale unit, the design margin of the early small and medium-sized PWRs remains more, the safety is slightly better than that of the large-sized reactor, and the construction period is short and the operating load factor is high. The total economy and large-