UO2 Pellet Thermal Conductivity From Irradiations With Central Melting

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Abstract: Continued irradiation experience under the AEC - Euratom, UO2 High Performance Program provided five separate and distinct sets of data on UO2 thermal conductivity. Four of these results are expressed in terms of the value of the thermal conductivity. The first two of these measurements were applicable -- strictly -- to poly crystalline UO2. Recently, three additional sets of measurements have been obtained -- all pertinent to UO2 after the formation of large columnar grains. The extent of melting in the experiments on which the results are based ranges from slight, to greater than 70 percent of the fuel … continued below

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iv, 31 pages ; illustrations

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Lyons, M. F.; Coplin, D. H.; Pashos, T. J. & Weidenbaum, B. July 1964.

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Abstract: Continued irradiation experience under the AEC - Euratom, UO2 High Performance Program provided five separate and distinct sets of data on UO2 thermal conductivity. Four of these results are expressed in terms of the value of the thermal conductivity. The first two of these measurements were applicable -- strictly -- to poly crystalline UO2. Recently, three additional sets of measurements have been obtained -- all pertinent to UO2 after the formation of large columnar grains. The extent of melting in the experiments on which the results are based ranges from slight, to greater than 70 percent of the fuel cross section. The conclusions from all of these thermal conductivity measurements considered together are: (1) The true value of the UO2 conductivity integral form 0 degrees C to melting (2805 - 15 degrees C) lies in the range from 90 to 96 W/cm. The most probable value is closer to 90 W/cm. To ensure no central melting and the associated clad swelling the maximum thermal performance level for solid pellet, UO2 fuel rods should not exceed 90 W/cm. (2) Any improvement in thermal conductivity due to the formation of large, columnar UO2 grains is small and not detectable within the experimental accuracy of the measurement, i.e., 3 to 4 W/cm.

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iv, 31 pages ; illustrations

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Digitized from microopaque cards.

Prepared under U.S. Atomic Energy Commission Contract AT(04-3)-189 Project Agreement 17 for Joint U.S.-Euratom Research and Development Program.

Includes bibliographic references (pages 29-30).

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  • Report No.: GEAP-4624
  • Grant Number: AT(04-3)-189 PA 17
  • SuDoc Number: Y 3.At 7:22/GEAP-4624
  • Accession or Local Control No: metadc1201440
  • Archival Resource Key: ark:/67531/metadc1201440

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Technical Report Archive and Image Library

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  • July 1964

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  • Aug. 15, 2019, 10:26 p.m.

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  • Sept. 15, 2023, 1:16 a.m.

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Lyons, M. F.; Coplin, D. H.; Pashos, T. J. & Weidenbaum, B. UO2 Pellet Thermal Conductivity From Irradiations With Central Melting, report, July 1964; San Jose, California. (https://digital.library.unt.edu/ark:/67531/metadc1201440/: accessed February 17, 2026), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.

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