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Failure Analysis and Strategy Investigation of the Rupture on the Gland Seal Steam Drain Pipeline of the Reheat Stop Valve

[+] Author Affiliations
Liang Zhao, Jianqun Hu, Weidong Zhao, Mingjun Chen

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

Guangfu Li

Shanghai Research Institute of Materials, Shanghai, China

Paper No. ICONE21-15916, pp. V001T01A025; 3 pages
doi:10.1115/ICONE21-15916
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

Macroscopical inspection and analysis of the pipe component, microstructure, fracture and corrosion product were conducted on the pipe parent metal, heat affected zone and the weld zone of the ruptured reheat stop valve shaft seal steam pipe of Qinshan III. The main failure cause could be concluded that oxidation corrosion on the pipe inner surface near the valve with high temperature steam cause the wall thickness largely reduced, and corrosion fatigue due to pipeline vibration eventually lead to fracture. The thinning rate of the failure pipe is assessed. There are total 32 similar pipelines in the two units of Qinshan III. The preventive repair strategies for this kind of pipelines are investigated. Wall thickness measurement and evaluation should be conducted in the outage sixth years after the pipeline replacement. The inspection location is 30mm∼150mm extent downstream of reheat stop valve outlet nozzle. The pipe section should be replaced in accordingly outage when the minimum measured wall thickness is less than 2mm.

Copyright © 2013 by ASME

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