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Fracture Mechanics Evaluation Considering Thermal Aging Embrittlement

[+] Author Affiliations
Yoon-Suk Chang, Tae-Eun Jin

Korea Power Engineering Company, Yongin, Korea

Paper No. PVP2002-1359, pp. 119-124; 6 pages
doi:10.1115/PVP2002-1359
From:
  • ASME 2002 Pressure Vessels and Piping Conference
  • Fatigue, Fracture and Damage Analysis, Volume 2
  • Vancouver, BC, Canada, August 5–9, 2002
  • Conference Sponsors: Pressure Vessels and Piping Division
  • ISBN: 0-7918-4654-7
  • Copyright © 2002 by ASME

abstract

Various cast austenitic stainless steels composed of austenite and ferrite phases are used for primary pressure boundary components such as main coolant loop piping, pump casings and so on in old PWRs. However, these components have been known to experience a loss of fracture toughness caused by thermal aging embrittlement, when exposed to reactor operating temperatures over a long period, that may lead to failure. The purpose of this paper is to introduce the major component status, thermal aging embrittlement susceptibility, material property change determination, flaw evaluation methods, case studies considering the thermal aging embrittlement phenomenon and future plan of Korean industry. The tentative results showed that the thermal aging embrittlement is a plausible age-related degradation mechanism, thereby its effects should be managed adequately in order to sustain the integrity of the corresponding components.

Copyright © 2002 by ASME

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