Resolution of USQ regarding source term in the 232-Z Waste Incinerator Building

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The 232-Z Waste Incinerator at the Hanford Plutonium Finishing Plant (PFP) was used to incinerate plutonium-bearing combustible materials generated during normal plant operations. Nondestructive (NDA) measurements performed after the incinerator ceased operations indicated high plutonium loadings in exhaust ductwork near the incinerator glovebox, while the incinerator was found to have only low quantities. Measurements, following a campaign to remove some of the ductwork, resulted in markedly higher assay value for the incinerator glovebox itself. Subsequent assays confirmed the most recent results and pointed to a potential further underestimation of the holdup, in part because of attenuation due to fire brick, ... continued below

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30 p.

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Westsik, G.A. September 1, 1995.

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  • Westinghouse Hanford Company
    Publisher Info: Westinghouse Hanford Co., Richland, WA (United States)
    Place of Publication: Richland, Washington

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Description

The 232-Z Waste Incinerator at the Hanford Plutonium Finishing Plant (PFP) was used to incinerate plutonium-bearing combustible materials generated during normal plant operations. Nondestructive (NDA) measurements performed after the incinerator ceased operations indicated high plutonium loadings in exhaust ductwork near the incinerator glovebox, while the incinerator was found to have only low quantities. Measurements, following a campaign to remove some of the ductwork, resulted in markedly higher assay value for the incinerator glovebox itself. Subsequent assays confirmed the most recent results and pointed to a potential further underestimation of the holdup, in part because of attenuation due to fire brick, which could not be seen easily and which had been reported to not be present. NaI detector based measurements were used to map the deposits. Extended count times, using high resolution Ge detectors helped estimate the isotopic composition of the plutonium and quantify the deposits. Experiments were performed using a Ge detector to obtain adequate corrections for the high attenuation of the incinerator glovebox. Several neutron detectors and detector configurations were employed to understand and quantify the neutron flux. Due to the disparity that was anticipated to occur between the gamma ray and neutron assay results, radiation modeling was used to try to reconcile the divergent results. This was a third aspect of the team`s effort, utilizing computer modeling to resolve discrepancies between measurement methods.

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30 p.

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INIS; OSTI as DE96001599

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  • 5. international conference on facility-safeguards interface, Jackson Hole, WY (United States), 24-30 Sep 1995

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  • Other: DE96001599
  • Report No.: WHC-SA--2807-FP
  • Report No.: CONF-950923--15
  • Grant Number: AC06-87RL10930
  • Office of Scientific & Technical Information Report Number: 119873
  • Archival Resource Key: ark:/67531/metadc623210

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  • September 1, 1995

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  • June 16, 2015, 7:43 a.m.

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  • Feb. 8, 2016, 9:29 p.m.

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Westsik, G.A. Resolution of USQ regarding source term in the 232-Z Waste Incinerator Building, article, September 1, 1995; Richland, Washington. (digital.library.unt.edu/ark:/67531/metadc623210/: accessed September 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.