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Failure Analysis of the Branch Connection Leakage on Primary Pipeline of the Primary Heat Transport System and the Maintenance Strategy Investigation for the Similar Connections

[+] Author Affiliations
Liang Zhao, Jianqun Hu, Xin Wang

CNNC Nuclear Power Operations Management Co., Ltd., Haiyan, Zhejiang, China

Ting Zhao

Chinese Academy of Sciences, Jiaxing, Zhejiang, China

Fengmin Chu

China Institute of Atomic Energy, Beijing, China

Paper No. ICONE21-16235, pp. V001T01A032; 4 pages
doi:10.1115/ICONE21-16235
From:
  • 2013 21st International Conference on Nuclear Engineering
  • Volume 1: Plant Operations, Maintenance, Engineering, Modifications, Life Cycle and Balance of Plant; Nuclear Fuel and Materials; Radiation Protection and Nuclear Technology Applications
  • Chengdu, China, July 29–August 2, 2013
  • Conference Sponsors: Nuclear Engineering Division
  • ISBN: 978-0-7918-5578-2
  • Copyright © 2013 by ASME

abstract

An primary pipeline branch connection of the primary heat transport system leaked in Dec, 2007. Physical and chemical testing are conducted on the leakage location of the branch connection. The primary failure cause was concluded that transgranular stress corrosion cracking (SCC) on stainless steel side of the branch connection dissimilar metal weld lead to the leakage. There are total 8 similar pipelines in each unit of Qinshan III. The preventive repair strategies for this kind of pipelines are investigated. The similar defects could be detected with ultrasonic testing in the planned shutdown outage. The corresponding precaution condition establishing methods for the similar branch connections with 3 typical positions are investigated and defined. A maintenance strategy to repair the dissimilar weld on the branch connection was developed.

Copyright © 2013 by ASME

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