Characterization of an enriched uranyl fluoride deposit in a valve and pipe intersection using time-of-flight transmission measurements with {sup 252}Cf

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A method was developed and successfully applied to characterize large uranyl fluoride (UO{sub 2}F{sub 2}) deposits at the former Oak Ridge Gaseous Diffusion Plant. These deposits were formed by a wet air in-leakage into the UF{sub 6} process gas lines over a period of years. The resulting UO{sub 2}F{sub 2} is hygroscopic, readily absorbing moisture from the air to form hydrates as UO{sub 2}F{sub 2}-nH{sub 2}O. The ratio of hydrogen to uranium can vary from 0--16, and has significant nuclear criticality safety impacts for large deposits. In order to properly formulate the required course of action, a non-intrusive characterization of ... continued below

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7 p.

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Wyatt, M.S.; Uckan, T.; Mihalczo, J.T.; Valentine, T.E. & Hannon, T.F. June 1, 1998.

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Description

A method was developed and successfully applied to characterize large uranyl fluoride (UO{sub 2}F{sub 2}) deposits at the former Oak Ridge Gaseous Diffusion Plant. These deposits were formed by a wet air in-leakage into the UF{sub 6} process gas lines over a period of years. The resulting UO{sub 2}F{sub 2} is hygroscopic, readily absorbing moisture from the air to form hydrates as UO{sub 2}F{sub 2}-nH{sub 2}O. The ratio of hydrogen to uranium can vary from 0--16, and has significant nuclear criticality safety impacts for large deposits. In order to properly formulate the required course of action, a non-intrusive characterization of the distribution of the fissile material within the pipe, its total mass, and amount of hydration was necessary. The Nuclear Weapons Identification System (NWIS) previously developed at the Oak Ridge Y-12 Plant for identification of uranium weapons components in storage containers was used to successfully characterize these deposits.

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7 p.

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INIS; OSTI as DE98003518

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  • 39. Institute of Nuclear Materials Management (INMM) annual meeting, Naples, FL (United States), 26-30 Jul 1998

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  • Other: DE98003518
  • Report No.: ORNL/CP--97759
  • Report No.: CONF-980733--
  • Grant Number: AC05-96OR22464
  • DOI: 10.2172/661435 | External Link
  • Office of Scientific & Technical Information Report Number: 661435
  • Archival Resource Key: ark:/67531/metadc711951

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  • June 1, 1998

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  • Sept. 12, 2015, 6:31 a.m.

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  • May 20, 2016, 2:32 p.m.

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Wyatt, M.S.; Uckan, T.; Mihalczo, J.T.; Valentine, T.E. & Hannon, T.F. Characterization of an enriched uranyl fluoride deposit in a valve and pipe intersection using time-of-flight transmission measurements with {sup 252}Cf, report, June 1, 1998; Tennessee. (digital.library.unt.edu/ark:/67531/metadc711951/: accessed November 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.