Effects of fill gas composition and pellet eccentricity: comparison between instrumented fuel assemblies IFA-431 and IFA-432

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Two 6-rod, instrumented test assemblies, designated IFA-431 and IFA-432, were designed to study the effects of fabricated fuel - cladding gap size, fuel density and stability, fill gas composition, linear heat rate, and burnup. Rod 4 of each assembly was designed to study the effects of fuel - cladding geometry and minimum gas thermal conductivity upon heat transfer across the gap between the fuel and cladding. To accomplish this, mechanical restraint was used to form a concentric fuel - cladding geometry in the upper end of the rod, and an eccentric geometry in the lower end of the rod; the ... continued below

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Cunningham, M.E.; Williford, R.E. & Hann, C.R. April 1, 1979.

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  • Pacific Northwest Laboratory
    Publisher Info: Battelle Pacific Northwest Labs., Richland, WA (USA)
    Place of Publication: Richland, Washington

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Description

Two 6-rod, instrumented test assemblies, designated IFA-431 and IFA-432, were designed to study the effects of fabricated fuel - cladding gap size, fuel density and stability, fill gas composition, linear heat rate, and burnup. Rod 4 of each assembly was designed to study the effects of fuel - cladding geometry and minimum gas thermal conductivity upon heat transfer across the gap between the fuel and cladding. To accomplish this, mechanical restraint was used to form a concentric fuel - cladding geometry in the upper end of the rod, and an eccentric geometry in the lower end of the rod; the rod was then backfilled with xenon gas. The eccentric fuel region of the xenon rod was observed to have lower fuel temperatures, for equal power, than the concentric fuel region. It is concluded that fuel - cladding eccentricity enhances the azimuthal average gap conductance, thus reducing the fuel centerline temperature. The xenon-filled rods were compared to rods backfilled with helium. As expected, the xenon rods had higher fuel temperatures than the helium-filled rods in the assemblies, although not as high as was initially predicted. It is concluded that the reduced temperatures (relative to the predicted temperatures) were the result of a greater decrease in fuel - cladding gap size than is predicted to occur from thermal expansion alone. The ratio of the gap conductances for a xenon rod and a helium rod with equal operating thermal radial gaps, is equal to the ratio of the gas thermal conductivities for the two rods.

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Dep. NTIS, PC A04/MF A01.

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  • Report No.: NUREG/CR-0331
  • Report No.: PNL-2729
  • Grant Number: EY-76-C-06-1830
  • DOI: 10.2172/6112850 | External Link
  • Office of Scientific & Technical Information Report Number: 6112850
  • Archival Resource Key: ark:/67531/metadc1112809

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Creation Date

  • April 1, 1979

Added to The UNT Digital Library

  • Feb. 22, 2018, 7:45 p.m.

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  • April 19, 2018, 6:56 p.m.

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Cunningham, M.E.; Williford, R.E. & Hann, C.R. Effects of fill gas composition and pellet eccentricity: comparison between instrumented fuel assemblies IFA-431 and IFA-432, report, April 1, 1979; Richland, Washington. (digital.library.unt.edu/ark:/67531/metadc1112809/: accessed November 15, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.