Nuclear Engineering and Technology

  • 제55권9호
  • /
  • Pages.3342-3351
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  • 2023
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  • 1738-5733(pISSN)
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  • 2234-358X(eISSN)
한국원자력학회 (Korean Nuclear Society)
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Evaluation of the seismic performance of butt-fusion joint in large diameter polyethylene pipelines by full-scale shaking table test

  • Jianfeng Shi (Institute of Process Equipment, College of Energy Engineering, Zhejiang University) ;
  • Ying Feng (Institute of Process Equipment, College of Energy Engineering, Zhejiang University) ;
  • Yangji Tao (Zhejiang Academy of Special Equipment Science) ;
  • Weican Guo (Zhejiang Academy of Special Equipment Science) ;
  • Riwu Yao (College of Mechanical Engineering, Zhejiang University) ;
  • Jinyang Zheng (Institute of Process Equipment, College of Energy Engineering, Zhejiang University)
  • 투고 : 2022.11.25
  • 심사 : 2023.06.07
  • 발행 : 2023.09.25
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초록

High-density polyethylene (HDPE) pipelines in nuclear power plants (NPPs) have to meet high requirements for seismic performance. HDPE pipes have been proved to have good seismic performance, but joints are the weak links in the pipelines, and pipeline failures usually initiate from the defects inside the joints. Limited data are available on the seismic performance of butt-fusion joints of HDPE pipelines in NPPs, especially in terms of defects changes inside the joints after earthquakes. In this paper, full-scale shaking table tests were performed on a test section of suspended HDPE pipelines in an NPP, which included straight pipes, elbows, and 10 butt-fusion joints. During the tests, the seismic load-induced strain of the joints was analyzed by strain gauges, and it was much smaller than the internal pressure and self-weight-induced strain. Before and after the shaking table tests, phased array ultrasonic testing (PA-UT) was conducted to detect defects inside the joints. The locations, numbers, and dimensions of the defects were analyzed. It was found that defects were more likely to occur in elbows joints. No new defect was observed after the shaking table tests, and the defects showed no significant growth, indicating the satisfactory seismic performance of the butt-fusion joints.

키워드

과제정보

This work was supported by the National Natural Science Foundation of China (Grant No. 52175150), and the Key R&D Program of Shandong Province (Grant No. 2021CXGC010303).

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