Correlation of waterside corrosion and cladding microstructure in high-burnup fuel and gadolinia rods

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Waterside corrosion of the Zircaloy cladding has been examined in high-burnup fuel rods from several BWRs and PWRs, as well as in 3 wt % gadolinia burnable poison rods obtained from a BWR. The corrosion behavior of the high-burnup rods was then correlated with results from a microstructural characterization of the cladding by optical, scanning-electron, and transmission-electron microscopy (OM, SEM, and TEM). OM and SEM examination of the BWR fuel cladding showed both uniform and nodular oxide layers 2 to 45 {mu}m in thickness after burnups of 11 to 30 MWd/kgU. For one of the BWRs, which was operated at ... continued below

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Chung, H.M. (Argonne National Lab., IL (USA)) September 1, 1989.

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Waterside corrosion of the Zircaloy cladding has been examined in high-burnup fuel rods from several BWRs and PWRs, as well as in 3 wt % gadolinia burnable poison rods obtained from a BWR. The corrosion behavior of the high-burnup rods was then correlated with results from a microstructural characterization of the cladding by optical, scanning-electron, and transmission-electron microscopy (OM, SEM, and TEM). OM and SEM examination of the BWR fuel cladding showed both uniform and nodular oxide layers 2 to 45 {mu}m in thickness after burnups of 11 to 30 MWd/kgU. For one of the BWRs, which was operated at 307{degree}C rather than the normal 288{degree}C, a relatively thick (50 to 70 {mu}m) uniform oxide, rather than nodular oxides, was observed after a burnup of 27 to 30 MWd/kgU. TEM characterization revealed a number of microstructural features that occurred in association with the intermetallic precipitates in the cladding metal, apparently as a result of irradiation-induced or -enhanced processes. The BWR rods that exhibited white nodular oxides contained large precipitates (300 to 700 nm in size) that were partially amorphized during service, indicating that a distribution of the large intermetallic precipitates is conductive to nodular oxidation. 23 refs., 9 figs.

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Pages: (22 p)

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NTIS, PC A03/MF A01; OSTI; INIS; GPO Dep.

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  • Technical committee meeting on fundamental aspects of corrosion of zirconium-based alloys in water reactor environments, Portland, OR (USA), 11-15 Sep 1989

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  • Other: DE90001439
  • Report No.: CONF-8909235-2
  • Grant Number: W-31109-ENG-38
  • Office of Scientific & Technical Information Report Number: 5656448
  • Archival Resource Key: ark:/67531/metadc1093973

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  • September 1, 1989

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  • Feb. 10, 2018, 10:06 p.m.

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  • April 19, 2018, 4:04 p.m.

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Chung, H.M. (Argonne National Lab., IL (USA)). Correlation of waterside corrosion and cladding microstructure in high-burnup fuel and gadolinia rods, article, September 1, 1989; Illinois. (digital.library.unt.edu/ark:/67531/metadc1093973/: accessed November 12, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.