Hybrid pellets: an improved concept for fabrication of nuclear fuel

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Description

The feasibility of fabricating fuel pellets using gel-derived microspheres as press feed was evaluated. By using gel-derived microspheres as press feed, the potential exists for eliminating dusty operations like milling, slugging, and granulation, from the pelleting process. The free-flowing character of the spheres should also result in limited dust generation during powder transport and pressing operations. The results of this study clearly demonstrate that fuel pellets can be successfully fabricated on a laboratory scale using UO/sub 2/ gel microspheres as press feed. Under moderate sintering conditions, 1,500/sup 0/C for 4 h in Ar-4% H/sub 2/, UO/sub 2/ pellets with densities ... continued below

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Pages: 56

Creation Information

Matthews, R.B. & Hart, P.E. September 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

The feasibility of fabricating fuel pellets using gel-derived microspheres as press feed was evaluated. By using gel-derived microspheres as press feed, the potential exists for eliminating dusty operations like milling, slugging, and granulation, from the pelleting process. The free-flowing character of the spheres should also result in limited dust generation during powder transport and pressing operations. The results of this study clearly demonstrate that fuel pellets can be successfully fabricated on a laboratory scale using UO/sub 2/ gel microspheres as press feed. Under moderate sintering conditions, 1,500/sup 0/C for 4 h in Ar-4% H/sub 2/, UO/sub 2/ pellets with densities up to 96% TD were fabricated. A range of pellet microstructures and densities were achieved depending on sphere forming and calcining conditions. Based on these results, a set of necessary sphere properties are suggested: O/U less than 2.20, crystallite size less than 500 A, specific surface area greater than 8 m/sup 2//g, and sphere size 200 and 400 ..mu..m. Preliminary attempts to fabricate ThO/sub 2/ and ThO/sub 2/-UO/sub 2/ pellets using microspheres were unsuccessful because the requisite sphere properties were not achieved. Areas requiring additional development include: demonstration of the process on scaled-up equipment suitable for use in a remote fuel fabrication facility and evaluation of the irradiation performance of pellet fuels from gel-spheres.

Physical Description

Pages: 56

Notes

Dep. NTIS, PC A04/MF A01.

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  • Report No.: PNL-3134
  • Grant Number: EY-76-C-06-1830
  • DOI: 10.2172/5768095 | External Link
  • Office of Scientific & Technical Information Report Number: 5768095
  • Archival Resource Key: ark:/67531/metadc1099236

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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

  • September 1, 1979

Added to The UNT Digital Library

  • Feb. 18, 2018, 3:59 p.m.

Description Last Updated

  • April 19, 2018, 7:14 p.m.

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Matthews, R.B. & Hart, P.E. Hybrid pellets: an improved concept for fabrication of nuclear fuel, report, September 1, 1979; Richland, Washington. (digital.library.unt.edu/ark:/67531/metadc1099236/: accessed November 13, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.