核电机组蒸汽发生器和汽轮机裕度匹配研究

国内新投产的部分压水堆核电机组陆续出现了主蒸汽调节阀急剧晃动、新蒸汽压力缓慢降低等问题，对机组的安全性和经济性造成一定影响。本研究通过设计参数和试验数据对比，并利用换热计算模型分析发现，55/19B蒸汽发生器设计裕度较同类型的60F稍偏低，低于通常的1.6×105 Pa的蒸汽压力裕度要求。蒸汽发生器新蒸汽压力、主蒸汽调节阀和汽轮机调节级通流面积在设计之初应进行综合匹配，尤其是要选用在超过70%的开度范围内都具有线性的调节特性的阀门，才能保证核电机组在整个寿期内的可靠性和经济性。 

Research of Margin Matching between Steam Generator and Steam Turbine in Nuclear Power Plant

Some of the nuclear power units of PWR newly put into operation in China have suffered from sharp shaking of the main steam control valve, slow pressure drop of new steam and other problems, which have certain impacts on the safety and economy of the unit. Through the comparison of the design parameters and the test data, and using the heat transfer calculation model to analyze, this study found that the design margin of 55/19B steam generator was lower than the similar 60F steam generator, and was also lower than the usual steam pressure margin of 1.6×105 Pa. The new steam pressure of the steam generator, the main steam control valve and the flow area of the steam turbine governing stage shall be comprehensively matched at the beginning of the design, especially the valves with linear regulation characteristics in the opening range of more than 70% shall be selected, so as to ensure the reliability and economy of the nuclear power unit throughout its lifetime.