Ex-Reactor Determination of Thermal Gap Conductance Between Uranium Dioxide and Zircaloy-4

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An ex-reactor study of the thermal gap conductance between Uranium Dioxide (UO{sub 2}) and Zircaloy-4 (Zr4) was performed under varying conditions of gas pressure (0.1 to 7 MPa); temperature (283 to 673 K); gas composition (He (100); Ar (100); He:Ar (51.79:48.21); and He:Xe (89.4:10.6)); and, average mean-plane separation distance D{sub mp} = 5.9 {micro}m (light contact); and, D{sub mp} = 23.1 {micro}m). In this report a description of the high pressure autoclave, specimen holder and associated apparatus is given together with experimental results. In conjunction with the experimental apparatus an assessment of determinant and indeterminant errors is made. In this ... continued below

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Garnier, J. & Begej, S. July 1980.

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An ex-reactor study of the thermal gap conductance between Uranium Dioxide (UO{sub 2}) and Zircaloy-4 (Zr4) was performed under varying conditions of gas pressure (0.1 to 7 MPa); temperature (283 to 673 K); gas composition (He (100); Ar (100); He:Ar (51.79:48.21); and He:Xe (89.4:10.6)); and, average mean-plane separation distance D{sub mp} = 5.9 {micro}m (light contact); and, D{sub mp} = 23.1 {micro}m). In this report a description of the high pressure autoclave, specimen holder and associated apparatus is given together with experimental results. In conjunction with the experimental apparatus an assessment of determinant and indeterminant errors is made. In this report the predicted gap conductance based on the "ideal" expression for the gap conductance, H{sub g} = K{sub gas}/(d + g{sub 1} + g{sub 2}) and assuming D{sub m}p = d and g{sub 1} = g{sub 2}, is compared to the H{sub g} results and found not to be in agreement. Use of the ideal gap conductance expression under these conditions is seen to under-estimate the value of H{sub g} results. A discussion of possible reasons for the differences between the observed and predicted behavior is made. In addition to experimental errors resulting from gaseous convection, a detailed examination of the ideal gap conductance expression reveals that the basic assumptions (upon which the ideal gap conductance expression is derived) are not valid for real surfaces in close proximity and/or contact.

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  • Report No.: PNL-3232 V2
  • Grant Number: DE-AC06-76RL01830
  • DOI: 10.2172/1076471 | External Link
  • Office of Scientific & Technical Information Report Number: 1076471
  • Archival Resource Key: ark:/67531/metadc839991

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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.

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  • July 1980

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  • May 19, 2016, 9:45 a.m.

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  • Nov. 28, 2016, 1:52 p.m.

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Garnier, J. & Begej, S. Ex-Reactor Determination of Thermal Gap Conductance Between Uranium Dioxide and Zircaloy-4, report, July 1980; Richland, Washington. (digital.library.unt.edu/ark:/67531/metadc839991/: accessed December 17, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.