Single point aerosol sampling: Evaluation of mixing and probe performance in a nuclear stack

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Description

Alternative Reference Methodologies (ARMS) have been developed for sampling of radionuclide; from stacks and ducts that differ from the methods required by the US EPA. The EPA methods are prescriptive in selection of sampling locations and in design of sampling probes whereas the alternative methods are performance driven. Tests were conducted in a stack at Los Alamos National Laboratory to demonstrate the efficacy of the ARMS. Coefficients of variation of the velocity tracer gas, and aerosol particle profiles were determined at three sampling locations. Results showed numerical criteria placed upon the coefficients of variation by the ARMs were met at ... continued below

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15 p.

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Rodgers, J. C.; Fairchild, C. I.; Wood, G. O.; Ortiz, C. A.; Muyshondt, A. & McFarland, A. R. December 31, 1994.

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Description

Alternative Reference Methodologies (ARMS) have been developed for sampling of radionuclide; from stacks and ducts that differ from the methods required by the US EPA. The EPA methods are prescriptive in selection of sampling locations and in design of sampling probes whereas the alternative methods are performance driven. Tests were conducted in a stack at Los Alamos National Laboratory to demonstrate the efficacy of the ARMS. Coefficients of variation of the velocity tracer gas, and aerosol particle profiles were determined at three sampling locations. Results showed numerical criteria placed upon the coefficients of variation by the ARMs were met at sampling stations located 9 and 14 stack diameters from flow entrance, but not at a location that is 1.5 diameters downstream from the inlet. Experiments were conducted to characterize the transmission of 10 {mu}m aerodynamic equivalent diameter liquid aerosol particles through three types of sampling probes. The transmission ratio (ratio of aerosol concentration at the probe exit plane to the concentration in the free stream) was 107% for a 113 L/min (4-cfm) an isokinetic shrouded probe, but only 20% for an isokinetic probe that follows the EPA requirements. A specially designed isokinetic probe showed a transmission ratio of 63%. The shrouded probe performance would conform to the ARM criteria; however, the isokinetic probes would not.

Physical Description

15 p.

Notes

INIS; OSTI as DE95007767

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  • 23. DOE/NRC nuclear air cleaning and treatment conference, Buffalo, NY (United States), 25-28 Jul 1994

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  • Other: DE95007767
  • Report No.: CONF-940738--10
  • Grant Number: W-7405-ENG-36
  • DOI: 10.2172/28289 | External Link
  • Office of Scientific & Technical Information Report Number: 28289
  • Archival Resource Key: ark:/67531/metadc673335

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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Creation Date

  • December 31, 1994

Added to The UNT Digital Library

  • June 29, 2015, 9:42 p.m.

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  • Oct. 3, 2017, 4:29 p.m.

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Rodgers, J. C.; Fairchild, C. I.; Wood, G. O.; Ortiz, C. A.; Muyshondt, A. & McFarland, A. R. Single point aerosol sampling: Evaluation of mixing and probe performance in a nuclear stack, report, December 31, 1994; New Mexico. (digital.library.unt.edu/ark:/67531/metadc673335/: accessed September 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.