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 –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. | Progress in Nuclear Energy 124 2020 103338 Contents lists available at ScienceDirect Progress in Nuclear Energy journal homepage http locate pnucene Modeling filtered building effluent stack sampling points for qualification criteria J. Matthew Barnett Xiao-Ying Yu Sarah R. Suffield Kurtis P. Recknagle Pacific Northwest National Laboratory . Box 999 Richland WA USA A R T I C L E I N F O A B S T R A C T Keywords Proposed construction of or changes to a radiological effluent stack must meet the mixing criteria at the sampled CFD stack location required by the standards ANSI HPS 2011 and ISO 2889. For more than a decade three- Standards dimensional computational fluid dynamics CFD models of such stacks have been used to assist in characterizing Modeling the sample location suitability. When inadequate mixing in the stack at the sampling location has been identified Radioactive air additional modeling was used. Testing results have confirmed the CFD model predictions with similar values in both scale model and full-scale stack tests. Simulations of a stack scheduled for modifications can evaluate mixing at the limits of operation recommend modifications and indicate if the retrofitted stack passes criteria for baseline operating conditions. This work demonstrates CFD modeling is an effective design tool and should be considered to facilitate qualification of a stack sampling location to meet standards. 1. Introduction 2010 is the international version of ANSI HPS . Testing must be performed on all new and retrofitted stacks to The . Department of Energy has a number of research and demonstrate system compliance. Testing options are provided in the development facilities throughout the United States one of which is ANSI HPS 2011 standard. One of three approaches may be Pacific Northwest National Laboratory PNNL located in southeastern taken 1 perform a full test series on the actual exhaust system 2 Washington State. For .
