Methods Used for Qualification of Sampling Location on a Nuclear
Jeremy Hawk, Idaho State University
Emissions from exhaust stacks at nuclear facilities are required to be monitored
for radionuclides. American National Standard Institute and Health Physics
Society standard N13.1-1999 gives the criteria for selection of the sampling
location. The criteria includes requirements for degree of cyclonic
flow, velocity profile, gas distribution and aerosol particle distribution
within the stack. ANSI/HPS N13.1-1999 references 40 CFR 60 Appendix
A, Method 1 for methodologies to be used during sampling location qualification.
The degree of cyclonic flow and velocity profile are determined using an s-type
Pitot tube. Distributions of gas and aerosol particles are tested by
removing samples from the stack using simple probes. Samples are processed
in the laboratory. Gas concentration is determined with mass spectroscopy.
Aerosol particle concentration is determined through the use of cascade impactors.