摘要
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。
In the ADS blowdown phase during SBLOCAs in AP1000, ADS-4 valves open and vent directly to the containment. If a critical vapor velocity is reached in the two hot legs, the liquid phase can be entrained to the containment through the ADS-4 in the form of liquid droplet. In the present study, the RELAP5 code is modified with the entrainment correlations obtained from the ATLATS test facility which was constructed at OSU in USA. Furthermore, the characteristics of liquid entrainment through ADS-4 during a 5.08cm （2 inch） cold leg SBLOCAs in AP1000 was investigated. Results showed that the current liquid entrainment model in RELAP5 underestimated the liquid entrainment quantity through ADS-4 and resulted in a non-conservative safety analysis results.
出处
《核动力工程》
EI
CAS
CSCD
北大核心
2015年第5期178-183,共6页
Nuclear Power Engineering
基金
国家重大科技专项经费资助(2011ZX06004-024-07-02-00)
