Comparisons of HELIOS Calculated Isotope Concentrations to Measured Values for Several Reactor Systems

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Heavy metal and fission product noble gas concentrations in spent fuel from two different PWR'S were calculated using HELIOS and compared to measured results from the literature. It was found that for the U-235/U-238 and Pu-240/Pu-239 isotopic ratios, the HELIOS calculation agreed to within the experimental uncertainty. For the Xe-131/Xe-134 isotopic ratios, HELIOS tended to overestimate the result by up to 4%. Conversely for the Xe-132/Xe-134 ratios, HELIOS underestimated the result by a slight amount ({approximately}1%). This suggests that either the fission product yields for Xe-131 and Xe-132 should be slightly altered or that the absorption cross-section for Xe-131 should ... continued below

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9 p.

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Charlton, W.S.; Perry, R.T.; Fearey, B.L. & Parish, T.A. October 21, 1998.

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Heavy metal and fission product noble gas concentrations in spent fuel from two different PWR'S were calculated using HELIOS and compared to measured results from the literature. It was found that for the U-235/U-238 and Pu-240/Pu-239 isotopic ratios, the HELIOS calculation agreed to within the experimental uncertainty. For the Xe-131/Xe-134 isotopic ratios, HELIOS tended to overestimate the result by up to 4%. Conversely for the Xe-132/Xe-134 ratios, HELIOS underestimated the result by a slight amount ({approximately}1%). This suggests that either the fission product yields for Xe-131 and Xe-132 should be slightly altered or that the absorption cross-section for Xe-131 should be slightly increased. More analysis is necessary to determine which of these two alternatives is more appropriate. This work has shown that the accuracy of HELIOS (within 2% for heavy metals and within 4% for fission noble gases) is sufficient for most analyses.

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9 p.

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INIS; OSTI as DE00759247

Medium: P; Size: 9 pages

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  • 16th Fuel Management Systems User Group Meeting, Madrid (ES), 10/21/1998--10/23/1998

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  • Report No.: LA-UR-98-4400
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 759247
  • Archival Resource Key: ark:/67531/metadc709622

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  • October 21, 1998

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  • Sept. 12, 2015, 6:31 a.m.

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  • April 11, 2017, 7:31 p.m.

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Charlton, W.S.; Perry, R.T.; Fearey, B.L. & Parish, T.A. Comparisons of HELIOS Calculated Isotope Concentrations to Measured Values for Several Reactor Systems, article, October 21, 1998; New Mexico. (digital.library.unt.edu/ark:/67531/metadc709622/: accessed September 22, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.