Progress report on return to nucleate boiling in electrically heated rod bundles under simulated PWR blowdown conditions

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The present results on return to nucleate boiling were obtained with a 7 x 7 full length, electrically heated fuel rod simulator bundle (THTF) designed for separate effects tests in the ORNL-PWR-BDHT Program. RNB was observed to occur frequently during the first 1 to 5 seconds of the transient when the system pressure was still greater than the 1000 psia. Other blowdown tests with a single BDHT-FRS in annular geometry in which RNB was induced at approx. one bar by spray cooling, showed that the BDHT-FRS and their surface conditions were typical of those in previous studies. The present results ... continued below

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Pages: 4

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Thomas, D.G. January 1, 1978.

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The present results on return to nucleate boiling were obtained with a 7 x 7 full length, electrically heated fuel rod simulator bundle (THTF) designed for separate effects tests in the ORNL-PWR-BDHT Program. RNB was observed to occur frequently during the first 1 to 5 seconds of the transient when the system pressure was still greater than the 1000 psia. Other blowdown tests with a single BDHT-FRS in annular geometry in which RNB was induced at approx. one bar by spray cooling, showed that the BDHT-FRS and their surface conditions were typical of those in previous studies. The present results are based on surface temperatures calculated using ORINC, a thermomechanical model of the BDHT-FRS which utilizes in-situ calibration to characterize gap thickness and internal thermal characteristics of the BDHT-FRS utilizing data from the sheath and center thermocouples.

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Pages: 4

Notes

Dep. NTIS, PC A02/MF A01.

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  • 6. water reactor safety research meeting, Germantown, MD, USA, 6 Nov 1978

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  • Report No.: CONF-781146-2
  • Grant Number: W-7405-ENG-26
  • Office of Scientific & Technical Information Report Number: 6517674
  • Archival Resource Key: ark:/67531/metadc1213037

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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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  • January 1, 1978

Added to The UNT Digital Library

  • July 5, 2018, 11:11 p.m.

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  • Oct. 23, 2018, 3:03 p.m.

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Thomas, D.G. Progress report on return to nucleate boiling in electrically heated rod bundles under simulated PWR blowdown conditions, article, January 1, 1978; United States. (digital.library.unt.edu/ark:/67531/metadc1213037/: accessed December 14, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.