Transient Behaviors of Thermo-Hydraulic and Thermal Stratification in the Pressurizer Surgeline for the Nuclear Power Plant  

作　　者：YU Huajie LI Lu TANG Qionghui PENG Yue LI Yinshi 

机构地区：[1]State Key Laboratory of Nuclear Power Safety Monitoring Technology and Equipment,Shenzhen 518172,China [2]Key Laboratory of Thermo-Fluid Science and Engineering of Ministry of Education,School of Energy and Power Engineering,Xi’an Jiaotong University,Xi’an 710049,China [3]School of Mechanics and Safety Engineering,Zhengzhou University,Zhengzhou 450001,China

出　　处：《Journal of Thermal Science》2022年第2期344-358,共15页热科学学报（英文版）

基　　金：supported by the Open Project of State Key Laboratory of Nuclear Power Safety Monitoring Technology and Equipment(K-A2019.424)。

摘　　要：In pressurized water reactor(PWR)system,the surgeline plays an important role in bonding the pressurizer and the primary circle.Some considerable problems,including the thermo-hydraulics,the thermal stratification and the accompanying thermal stress under transient conditions,pose risks to the surgeline integrity.Herein,a fully-coupled flow-heat-thermo-elasticity model was developed to investigate the transient behavior of thermo-hydraulic parameters and the thermal stratification phenomenon in PWR.To evaluate the nonuniformity of the stratified flow,a stratification degree indicatorζis introduced.It is found that during the outsurge flow,the increase of temperature variation will enlarge the temperature gradient on the wall,corresponding to a more serious deformation.In the cases of positive temperature variation,the higher temperature variation causes higher stratification degreeζ,and vice versa.The mass flow rate m and the stratification degree are in negative correlation.The local deformation can reach 1.802 cm under a 50 K temperature variation,while its location varies from case to case.More attention should be paid to the regulation between the highest deformation location and the surgeline thermo-hydraulic parameters.

关 键 词：pressurized water reactor surgeline transient thermo-hydraulic thermal stratification thermal stress-strain 

分 类 号：TM623[电气工程—电力系统及自动化]