Study on Flow Distribution Characteristics of Reactor Passive Residual Heat Removal System

3rd International Symposium on Resource Exploration and Environmental Science

生态环境科学

Yuan, Tianhong^1 ; Cai, Qi^1 ; Yu, Lei^1

College of Nuclear Science and Technology, Naval University of Engineering, Wuhan, China^1

关键词: Flow area;    Flow distribution;    Flow resistance;    N-S equations;    No more than 5;    Parallel line;    Passive residual heat removal system;    Theoretical modeling;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/300/4/042118/pdf
DOI  :  10.1088/1755-1315/300/4/042118

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

During the passive residual heat removal system at the reactor primary loop (PRHRS) operation, the parallel pipeline is formed between the channels of PRHRS heat exchanger (HX) and steam generator (SG), and the later flow is large, which has a bypass effect on the former flow. Based on one-dimensional N-S equation, a theoretical model is established to describe the flow distribution characteristics of this parallel pipeline. To verify the model, the AP1000 PRHRS is taken as an example, and the results calculated by the model are compared with that of RELAP5 numerical simulation, the error of which is no more than 5%. Based on the model, the flow distribution characteristics of the parallel line are analyzed. The results show that, due to the large flow area and small flow resistance, the SG channel flow is much bigger than the HX channel flow after PRHRS is activated. Because this phenomenon has a great effect on the capacity of PRHRS, it's necessary to be further analyzed.