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

Technical Report · Sat Dec 31 04:00:00 EST 1994

DOI:https://doi.org/10.2172/28289· OSTI ID:28289

Rodgers, J C; Fairchild, C I; Wood, G O ^[1]; Ortiz, C A; Muyshondt, A ^[2]; McFarland, A R ^[3]

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1. Los Alamos National Lab., NM (United States)
2. Texas A and M Univ., College Station, TX (United States)
3. Los Alamos National Lab., NM (United States). Health Physics Measurement Group

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.

• Research Organization: Los Alamos National Lab., NM (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States); Nuclear Regulatory Commission, Washington, DC (United States)
• DOE Contract Number: W-7405-ENG-36
• OSTI ID: 28289
• Report Number(s): CONF-940738--10; ON: DE95007767; CNN: Grant 04-89-353; Grant 04-90-115; Grant 04-92-080
• Country of Publication: United States
• Language: English

Related Subjects

05 NUCLEAR FUELS
AEROSOL MONITORING
AIR POLLUTION
AIR SAMPLERS
COMPILED DATA
LANL
PARTICLE SIZE
PERFORMANCE TESTING
RADIOACTIVE AEROSOLS
STACK DISPOSAL