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

  • YU Huajie ,
  • LI Lu ,
  • TANG Qionghui ,
  • PENG Yue ,
  • LI Yinshi
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  • 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

网络出版日期: 2023-11-30

基金资助

This work was supported by the Open Project of State Key Laboratory of Nuclear Power Safety Monitoring Technology and Equipment (K-A2019.424).

版权

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2022

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

  • YU Huajie ,
  • LI Lu ,
  • TANG Qionghui ,
  • PENG Yue ,
  • LI Yinshi
Expand
  • 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

Online published: 2023-11-30

Supported by

This work was supported by the Open Project of State Key Laboratory of Nuclear Power Safety Monitoring Technology and Equipment (K-A2019.424).

Copyright

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2022

摘要

在压水堆核电站中,波动管在连接稳压器和主回路方面起着重要作用。实际系统中各种扰动因素导致波动管内存在复杂的瞬态过程,如典型的热分层现象、热工水力不稳定状态等直接给波动管的热结构完整性带来严重挑战。为此,本文建立了一个流动-传热-热弹性多物理场全耦合分析模型,用于研究压水堆稳压器瞬态运行模式下波动管内的瞬态行为和热结构问题。为了综合评价热分层流动的均匀性问题,研究中引入了分层程度的指标参数ζ。研究发现,稳压器波出流动过程中,温度扰动量增加时会使壁面温度梯度变大,对应的波动管热变形更为严重。在温度为正波动的情况下,高温变化也会导致较高的分层度 ζ,反之亦然;波动质量流量与分层程度呈负相关关系。在温度变化达50K时,局部最大变形可达到 1.802 cm,不同位置的变形量也都有所不同。瞬态热工水力特性的研究表明,波动管热工运行状态与管体变形直接相关,应当重视必要的调控调节。

本文引用格式

YU Huajie , LI Lu , TANG Qionghui , PENG Yue , LI Yinshi . Transient Behaviors of Thermo-Hydraulic and Thermal Stratification in the Pressurizer Surgeline for the Nuclear Power Plant[J]. 热科学学报, 2022 , 31(2) : 344 -358 . DOI: 10.1007/s11630-022-1536-6

Abstract

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 indicator ζ is 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 degree ζ, and vice versa. The mass flow rate   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.

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