Evaluation of cracking in steam generator feedwater piping in pressurized water reactor plants

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Cracking in feedwater piping was detected near the inlet to steam generators in 15 pressurized water reactor plants. Sections with cracks from nine plants are examined with the objective of identifying the cracking mechanism and assessing various factors that might contribute to this cracking. Using transmission electron microscopy, fatigue striations are observed on replicas of cleaned crack surfaces. Calculations based on the observed striation spacings gave a cyclic stress value of 150 MPa (22 ksi) for one of the major cracks. The direction of crack propagation was invariably related to the piping surface and not to the piping axis. These ... continued below

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Pages: 32

Creation Information

Goldberg, A. & Streit, R.D. May 1, 1981.

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Description

Cracking in feedwater piping was detected near the inlet to steam generators in 15 pressurized water reactor plants. Sections with cracks from nine plants are examined with the objective of identifying the cracking mechanism and assessing various factors that might contribute to this cracking. Using transmission electron microscopy, fatigue striations are observed on replicas of cleaned crack surfaces. Calculations based on the observed striation spacings gave a cyclic stress value of 150 MPa (22 ksi) for one of the major cracks. The direction of crack propagation was invariably related to the piping surface and not to the piping axis. These two factors are consistent with the proposed concept of thermally induced, cyclic, tensile surface stresses and it is concluded that the overriding factor in the cracking problem was the presence of such undocumented cyclic loads.

Physical Description

Pages: 32

Notes

NTIS, PC A03/MF A01.

Source

  • 7. inter-american conference on materials technology, Mexico City, Mexico, Oct 1981

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  • Other: DE81021834
  • Report No.: UCRL-84168
  • Report No.: CONF-811011-1
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 6275006
  • Archival Resource Key: ark:/67531/metadc1111513

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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Creation Date

  • May 1, 1981

Added to The UNT Digital Library

  • Feb. 22, 2018, 7:45 p.m.

Description Last Updated

  • April 26, 2018, 3:38 p.m.

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Goldberg, A. & Streit, R.D. Evaluation of cracking in steam generator feedwater piping in pressurized water reactor plants, article, May 1, 1981; [Livermore,] California. (digital.library.unt.edu/ark:/67531/metadc1111513/: accessed December 10, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.