Nuclear Techniques ›› 2019, Vol. 42 ›› Issue (12): 120602-120602.doi: 10.11889/j.0253-3219.2019.hjs.42.120602

• NUCLEAR ENERGY SCIENCE AND ENGINEERING • Previous Articles    

Research on data analysis of added strain gagues of containment building under the pressure test of nuclear power unit during the overhaul period

Jianbo LI1,Zhaorui LIANG2,Yongjun SONG2(),Xunqiang YIN1,Yanlin SONG2,Bin JIANG2   

  1. 1. Earthquake Engineering Research Division, Dalian University of Technology, Dalian 116024, China
    2. Liaoning Hongyanhe Nuclear Power Co. , Ltd, Dalian 116001, China
  • Received:2019-07-11 Revised:2019-10-13 Online:2019-12-10 Published:2019-12-18
  • Contact: Yongjun SONG E-mail:lc-tm2008@163.com
  • About author:LI Jianbo, male, born in 1977, graduated from Dalian University of Technology in 2005, focusing on numerical simulation analysis of earthquake damage of concrete structures
  • Supported by:
    National Major Scientific Research Program of China(2016YFB0201003)

Abstract: Background

Online monitoring of containment deformation is an important method to evaluate the safety status of nuclear power plant during operation. Additional strain gauges are required to be installed on the outer wall of the shell when the embedded parts failed.

Purpose

This study aims to verify whether the monitoring data of the additional strain gauges can reasonably reflect the law of internal deformation.

Methods

First of all, based on the ANSYS software, a three-dimensional refined calculation model for the containment structure of a nuclear power unit CPR1000 was established. Among them, the solid reinforcement method and cooling method were used to simulate the prestressed tendons and the application of pretension. Then, the interactions between steel liner and concrete in the integral model were realized by considering the nodes coupling and the influence of ordinary rebars in concrete. Furthermore, the reasonable reliability of the established calculation model was verified by using ANSYS, and the monitoring data of the embedded monitoring strain gauges under the pressure test of nuclear power unit during the overhaul period. At the same time, the material parameters of the model were modified by sensitivity analysis of the parameters of concrete and prestress. Finally, the relationship between the internal deformation and external deformation of the containment structure and its variation rule was discussed under typical load.

Results

The calculated results demonstrate that the calculated strain values of the modified model are in good agreement with the field monitoring results, and the wall thickness away from equipment hatch are linearly distributed when the value of elastic modulus of concrete is 45 GPa and other parameters are taken as the initial values.

Conclusions

The monitoring results of added strain gagues on the outer wall of containment building can well reflect the internal deformation law and the alternative is feasible.

Key words: Nuclear power unit, CPR1000, Added strain meter, Refinement simulation, ANSYS

CLC Number: 

  • TL363