Radiological Assessment for the Removal of Legacy BPA Power Lines that Cross the Hanford Site

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This paper discusses some radiological field monitoring and assessment methods used to assess the components of an old electrical power transmission line that ran across the Hanford Site between the production reactors area (100 Area) and the chemical processing area (200 Area). This task was complicated by the presence of radon daughters�both beta and alpha emitters�residing on the surfaces, particularly on the surfaces of weathered metals and metals that had been electrically-charged. In many cases, these activities were high compared to the DOE Surface Contamination Guidelines, which were used as guides for the assessment. These methods included the use of ... continued below

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Millsap, William J. & Brush, Daniel J. November 13, 2013.

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This article is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided by UNT Libraries Government Documents Department to Digital Library, a digital repository hosted by the UNT Libraries. More information about this article can be viewed below.

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  • Hanford Site (Wash.)
    Publisher Info: HNF (Hanford Site (HNF), Richland, WA (United States))
    Place of Publication: Richland, Washington

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Description

This paper discusses some radiological field monitoring and assessment methods used to assess the components of an old electrical power transmission line that ran across the Hanford Site between the production reactors area (100 Area) and the chemical processing area (200 Area). This task was complicated by the presence of radon daughters�both beta and alpha emitters�residing on the surfaces, particularly on the surfaces of weathered metals and metals that had been electrically-charged. In many cases, these activities were high compared to the DOE Surface Contamination Guidelines, which were used as guides for the assessment. These methods included the use of the Toulmin model of argument�represented using Toulmin diagrams-- to represent the combined force of several strands of evidences, rather than a single measurement of activity, to demonstrate beyond a reasonable doubt that no or very little Hanford activity was present and mixed with the natural activity. A number of forms of evidence were used: the overall chance of Hanford contamination; measurements of removable activity, beta and alpha; 1-minute scaler counts of total surface activity, beta and alpha, using �background makers�; the beta activity to alpha activity ratios; measured contamination on nearby components; NaI gamma spectral measurements to compare uncontaminated and potentially-contaminated spectra, as well as measurements for the sentinel radionuclides, Am- 241 and Cs-137 on conducting wire; comparative statistical analyses; and in-situ measurements of alpha spectra on conducting wire showing that the alpha activity was natural Po-210, as well as to compare uncontaminated and potentially-contaminated spectra.

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  • WM2014 Waste Management Symposia, Phoenix, AZ, 03/02/2014 - 03/06/2014

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  • Report No.: HNF-56300-FP Rev 0 Draft
  • Grant Number: DE-AC06-09RL14728
  • Office of Scientific & Technical Information Report Number: 1105959
  • Archival Resource Key: ark:/67531/metadc871756

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  • November 13, 2013

Added to The UNT Digital Library

  • Sept. 16, 2016, 12:32 a.m.

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  • Nov. 1, 2016, 11:19 a.m.

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Millsap, William J. & Brush, Daniel J. Radiological Assessment for the Removal of Legacy BPA Power Lines that Cross the Hanford Site, article, November 13, 2013; Richland, Washington. (digital.library.unt.edu/ark:/67531/metadc871756/: accessed August 16, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.