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          NRC Library  Document Collections  NUREG-Series Publications  Publications Prepared by NRC ContractorsFull-Scale Measurements of Smoke Transport and Deposition in Ventilation System Ductwork (NUREG/CR-4321,LA-10478-MS)

On this page: Publication Information AbstractDownload complete document NUREG/CR-4321 (PDF - 1.61 MB)Publication Information **Manuscript Completed:**June 1985**Date Published:**July 1985 **Prepared by:** R.A. Martin Los Alamos National Laboratory Los Alamos, New Mexico 87545 D.L. Fenton Mechanical Engineering Department  New Mexico State University Las Cruces, NM 88003 **Prepared for:** Division of Risk Analysis  Office of Nuclear Regulatory Research U.S. Nuclear Regulatory Commission  Washington, DC 20555-0001 NRC FIN A-7029 Availability Notice 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 deposition, 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. 
      
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