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1000 MW非能动先进压水堆AP1000小破口自动降压系统(ADS)喷放阶段,ADS-4阀门开启,直接向安全壳喷放。当热段内的蒸汽流速达到临界值时,热段内的液相以液滴的形式通过ADS-4夹带至安全壳。本文采用美国俄勒冈州立大学ATLATS试验装置获得的液滴夹带关系式对RELAP5程序的源代码进行修改,进而采用修改版的RELAP5程序针对AP1000 5.08 cm冷段小破口失水事故过程ADS-4的液滴夹带特性进行研究。计算结果表明,RELAP5现有的液滴夹带模型对通过ADS-4的液滴夹带量预测偏低,这将导致不保守的安全分析结果。
1000 MW Passive Advanced PWR AP1000 Small Break Automatic Pressure Reducing System (ADS) During the discharge phase, the ADS-4 valve opens and injects directly into the containment. When the vapor velocity in the hot section reaches a critical value, the liquid phase in the hot section is entrained in the form of droplets through the ADS-4 to the containment. In this paper, we use the entrainment relation of droplet obtained by ATLATS experimental device of Oregon State University to modify the source code of RELAP5 program, and then use the modified version of RELAP5 program to deal with the solution of ADS-4 in AP1000 5.08 cm Droplet entrainment characteristics were studied. The calculated results show that the existing droplet entrainment model of RELAP5 predicts a low droplet entrainment rate through the ADS-4, which leads to an unconservative safety analysis result.