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Title: Modifications to HGSYSTEM to account for UF{sub 6} chemistry and thermodynamics

Abstract

Uranium hexafluoride (UF{sub 6}) flashes to a mixture of vapor and solid particles when accidentally released to the atmosphere after storage as a liquid at elevated pressure and temperature. The particles evaporate, cooling the mixture. The UF{sub 6} gas, which is very dense, reacts with water vapor to form HF and UO{sub 2}F{sub 2}, heating the plume. The HF continues to react with water vapor, further releasing heat within the plume. The resulting three-phase plume can alternate from negative to positive buoyancy. Because the HGSYSTEM model accounts for a wide variety of source types (instantaneous, transient, or continuous jets, pools, or volume sources) and includes HF chemistry and thermodynamics, it was chosen as a platform for modeling UF{sub 6}. The physical and chemical characteristics of the UF{sub 6} plume are derived in a series of modules, which are incorporated in HGSYSTEM. The method of solution of the full set of time-variable equations (chemistry, thermodynamics, and entrainment) is shown. The modeling system is described, and the results of comparisons with independent solutions are presented.

Authors:
; ;  [1]
  1. EARTH/TECH/Sigma Research Corp., Concord, MA (United States)
Publication Date:
OSTI Identifier:
287567
Report Number(s):
CONF-950927-
ISBN 0-8169-0660-2; TRN: 96:022900
Resource Type:
Conference
Resource Relation:
Conference: International conference and workshop on modeling and mitigating the consequences of accidental releases of hazardous materials, New Orleans, LA (United States), 26-29 Sep 1995; Other Information: PBD: 1995; Related Information: Is Part Of International conference and workshop on modeling and mitigating the consequences of accidental releases of hazardous materials; PB: 1044 p.
Country of Publication:
United States
Language:
English
Subject:
05 NUCLEAR FUELS; URANIUM HEXAFLUORIDE; ENVIRONMENTAL TRANSPORT; HYDROFLUORIC ACID; H CODES; ATMOSPHERIC CHEMISTRY; ACCIDENTS; SAFETY; PLUMES

Citation Formats

Hanna, S R, Chang, J, and Zhang, X. Modifications to HGSYSTEM to account for UF{sub 6} chemistry and thermodynamics. United States: N. p., 1995. Web.
Hanna, S R, Chang, J, & Zhang, X. Modifications to HGSYSTEM to account for UF{sub 6} chemistry and thermodynamics. United States.
Hanna, S R, Chang, J, and Zhang, X. Sun . "Modifications to HGSYSTEM to account for UF{sub 6} chemistry and thermodynamics". United States.
@article{osti_287567,
title = {Modifications to HGSYSTEM to account for UF{sub 6} chemistry and thermodynamics},
author = {Hanna, S R and Chang, J and Zhang, X},
abstractNote = {Uranium hexafluoride (UF{sub 6}) flashes to a mixture of vapor and solid particles when accidentally released to the atmosphere after storage as a liquid at elevated pressure and temperature. The particles evaporate, cooling the mixture. The UF{sub 6} gas, which is very dense, reacts with water vapor to form HF and UO{sub 2}F{sub 2}, heating the plume. The HF continues to react with water vapor, further releasing heat within the plume. The resulting three-phase plume can alternate from negative to positive buoyancy. Because the HGSYSTEM model accounts for a wide variety of source types (instantaneous, transient, or continuous jets, pools, or volume sources) and includes HF chemistry and thermodynamics, it was chosen as a platform for modeling UF{sub 6}. The physical and chemical characteristics of the UF{sub 6} plume are derived in a series of modules, which are incorporated in HGSYSTEM. The method of solution of the full set of time-variable equations (chemistry, thermodynamics, and entrainment) is shown. The modeling system is described, and the results of comparisons with independent solutions are presented.},
doi = {},
url = {https://www.osti.gov/biblio/287567}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1995},
month = {12}
}

Conference:
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