Testing and analysis of structural integrity of electrosleeved tubes under severe accident transients

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The structural integrity of flawed steam generator tubing with Electrosleeves{trademark} under simulated severe accident transients was analyzed by analytical models that used available material properties data and results from high-temperature tests conducted on Electrosleeved tubes. The Electrosleeve material is almost pure Ni and derives its strength and other useful properties from its nanocrystalline microstructure, which is stable at reactor operating temperatures. However, it undergoes rapid grain growth, at the high temperatures expected during severe accidents, resulting in a loss of strength and a corresponding decrease in flow stress. The magnitude of this decrease depends on the time-temperature history during the ... continued below

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15 p.

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Majumdar, S. December 10, 1999.

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Description

The structural integrity of flawed steam generator tubing with Electrosleeves{trademark} under simulated severe accident transients was analyzed by analytical models that used available material properties data and results from high-temperature tests conducted on Electrosleeved tubes. The Electrosleeve material is almost pure Ni and derives its strength and other useful properties from its nanocrystalline microstructure, which is stable at reactor operating temperatures. However, it undergoes rapid grain growth, at the high temperatures expected during severe accidents, resulting in a loss of strength and a corresponding decrease in flow stress. The magnitude of this decrease depends on the time-temperature history during the accident. Failure tests were conducted at ANL and FTI on internally pressurized Electrosleeved tubes with 80% and 100% throughwall machined axial notches in tie parent tubes that were subjected to simulated severe accident temperature transients. The test results, together with the analytical model, were used to estimate the unaged flow stress curve of the Electrosleeved material at high temperatures. Failure temperatures for Electrosleeved tubes with throughwall and part-throughwall axial cracks of various lengths in the parent tubes were calculated for a postulated severe accident transient.

Physical Description

15 p.

Notes

INIS; OSTI as DE00751863

Medium: P; Size: 15 pages

Source

  • 8th International Conference on Nuclear Engineering, Baltimore, MD (US), 04/02/2000--04/06/2000

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  • Report No.: ANL/ET/CP-100683
  • Grant Number: W-31109-ENG-38
  • Office of Scientific & Technical Information Report Number: 751863
  • Archival Resource Key: ark:/67531/metadc704434

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  • December 10, 1999

Added to The UNT Digital Library

  • Sept. 12, 2015, 6:31 a.m.

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  • April 7, 2017, 3:11 p.m.

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Majumdar, S. Testing and analysis of structural integrity of electrosleeved tubes under severe accident transients, article, December 10, 1999; Illinois. (digital.library.unt.edu/ark:/67531/metadc704434/: accessed September 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.