Calculation of combustible waste fraction (CWF) estimates used in organics safety issue screening

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This report describes how in-tank measurements of moisture (H{sub 2}O) and total organic carbon (TOC) are used to calculate combustible waste fractions (CWF) for 138 of the 149 Hanford single shell tanks. The combustible waste fraction of a tank is defined as that proportion of waste that is capable of burning when exposed to an ignition source. These CWF estimates are used to screen tanks for the organics complexant safety issue. Tanks with a suitably low fraction of combustible waste are classified as safe. The calculations in this report determine the combustible waste fractions in tanks under two different moisture ... continued below

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492 p.

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Heasler, P.G.; Gao, F. & Toth, J.J. August 1, 1998.

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Description

This report describes how in-tank measurements of moisture (H{sub 2}O) and total organic carbon (TOC) are used to calculate combustible waste fractions (CWF) for 138 of the 149 Hanford single shell tanks. The combustible waste fraction of a tank is defined as that proportion of waste that is capable of burning when exposed to an ignition source. These CWF estimates are used to screen tanks for the organics complexant safety issue. Tanks with a suitably low fraction of combustible waste are classified as safe. The calculations in this report determine the combustible waste fractions in tanks under two different moisture conditions: under current moisture conditions, and after complete dry out. The first fraction is called the wet combustible waste fraction (wet CWF) and the second is called the dry combustible waste fraction (dry CWF). These two fractions are used to screen tanks into three categories: if the wet CWF is too high (above 5%), the tank is categorized as unsafe; if the wet CWF is low but the dry CWF is too high (again, above 5%), the tank is categorized as conditionally safe; finally, if both the wet and dry CWF are low, the tank is categorized as safe. Section 2 describes the data that was required for these calculations. Sections 3 and 4 describe the statistical model and resulting fit for dry combustible waste fractions. Sections 5 and 6 present the statistical model used to estimate wet CWF and the resulting fit. Section 7 describes two tests that were performed on the dry combustible waste fraction ANOVA model to validate it. Finally, Section 8 presents concluding remarks. Two Appendices present results on a tank-by-tank basis.

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492 p.

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INIS; OSTI as DE98058233

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  • Other Information: PBD: Aug 1998

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  • Other: DE98058233
  • Report No.: PNNL--11930
  • Grant Number: AC06-76RL01830
  • DOI: 10.2172/290896 | External Link
  • Office of Scientific & Technical Information Report Number: 290896
  • Archival Resource Key: ark:/67531/metadc676755

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Office of Scientific & Technical Information Technical Reports

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  • August 1, 1998

Added to The UNT Digital Library

  • July 25, 2015, 2:20 a.m.

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  • June 14, 2016, 6:45 p.m.

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Heasler, P.G.; Gao, F. & Toth, J.J. Calculation of combustible waste fraction (CWF) estimates used in organics safety issue screening, report, August 1, 1998; Richland, Washington. (digital.library.unt.edu/ark:/67531/metadc676755/: accessed December 14, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.