摘要
在压水堆发生 LOCA 事故时,需要依靠回流流动来进行堆芯的冷却,而存在着回流流动极限(Counter-Current Flow Limiting,CCFL),即冷却剂受重力作用向下流动时,会受到向上流动的蒸汽或其他气体阻挠,出现部分或全部冷却剂被气相带走的现象,导致冷却剂流速不能再增大,从而限制了传热效果。使用 RELAP5 对 LOCA 事故时弯头肘部的 CCFL 现象进行分析,分别研究管长 L、管径 D 以及倾斜角θ对 CCFL 的影响,研究表明管长 L 越小,管径 D 越大,CCFL 的安全裕度越高,而倾斜角θ对该条件下 CCFL 现象的影响不明显。
During the LOCA accident,Counter-Current Flow is needed for core cooling,but Counter-current flow is limited(Counter-Current Flow Limiting,CCFL),that is,when coolant flows downward by gravity,it is obstructed by the upward steam flow or other gases,and the phenomenon is that some or all of the coolant is taken away by vapor phase,leading to the result that the coolant flow rate can not increases,and the heat transfer is also limited. In this paper, RELAP5 is used to analyze the CCFL at elbow part during LOCA accident. The effects of tube length L、pipe diameter D and inclination angle θ are discussed respectively. The result shows that the smaller the pipe length L、the greater the diameter D、result in the higher safety margin of CCFL,and there is no obvious relationship with the inclination angle θ under such situation.
作者
江灼威
蔡杰进
JIANG Zhuowei;CAI Jiejin(School of Electric Power,South China University of Technology,Guangzhou of Guangdong Prov. 510640,China)
出处
《核科学与工程》
CAS
CSCD
北大核心
2019年第3期414-422,共9页
Nuclear Science and Engineering
基金
国家自然科学基金资助项目(11675057)
