Modeling filtered building effluent stack sampling points for qualification criteria

Proposed construction of or changes to a radiological effluent stack must meet the mixing criteria at the sampled stack location required by the standards ANSI/HPS N13.1–2011 and ISO 2889. For more than a decade, threedimensional computational fluid dynamics (CFD) models of such stacks have been used to assist in characterizing the sample location suitability.