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Full-Scale Measurements of Smoke Transport and Deposition in Ventilation System Ductwork (NUREG/CR-4321)

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Publication Information
Abstract

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NUREG/CR-4321 (PDF - 1.61 MB)

Publication Information

R. A. Martin D. L. Fenton

Manuscript submitted: June 1985
Date published: July 1985

Prepared for
Division of Risk Analysis
Office of Nuclear Regulatory Research
US Nuclear Regulatory Commission
Washington, DC 20555
NRC FIN No. A7029

Consultant at Los Alamos
New Mexico State University,
Las Cruces, NM 88003.

Los Alamos National Laboratory
Los Alamos,
New Mexico 87545

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Abstract

This study is part of an effort to obtain experimental data in support of the fire accident analysis computer code FIRAC, which was developed at the Los Alamos National Laboratory. FIRAC can predict the transient movement of aerosolized or gaseous material throughout the complex ventilation systems-of-nuclear fuel cycle facilities. We conducted a preliminary set of full-scale material depletion/modification experiments to help assess the accuracy of the code's aerosol depletion model. Such tests were performed under realistic conditions using real combustion products in full-sized ducts at typical airflow rates. To produce a combustion aerosol, we burned both polystyrene and polymethyl methacrylate, the most and least smoky fuels typically found in fuel cycle plants, under varied ventilation (oxygen-lean and oxygen-rich) conditions. Aerosol mass depos.ition, size,,and concentration measurements were performed. We found that as much as -25% of polystyrene smoke mass and as little as 2% of the polymethyl methacrylate generated at the entrance to a 15.2-m duct is deposited on the duct walls. We also compared our experimental results with.theoretical equations currently used in FIRAC.