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Metal oxide aerosol dry deposition in laminar pipe flow at high thermal gradients and comparison with SOPHAEROS module of ASTEC reactor accident analysis code

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Title Metal oxide aerosol dry deposition in laminar pipe flow at high thermal gradients and comparison with SOPHAEROS module of ASTEC reactor accident analysis code
 
Creator MODI, R
KHAN, A
JOSHI, M
GANJU, S
SINGH, AK
SRIVASTAVA, A
SAPRA, BK
MAYYA, YS
 
Subject Aerosol
Deposition
Laminar flow
Thermophoresis
SOPHAEROS
ASTEC
FISSION-PRODUCT TRANSPORT
CESIUM IODIDE
 
Description During a severe nuclear reactor accident involving core melt down conditions, the deposition of fission product aerosols inside the reactor coolant system affects the final source term available to the containment and subsequently to the environment. Towards quantifying the aerosol deposition under varying flow conditions and thermal gradients, as may be encountered in the heat transport systems, experiments were performed to investigate the dry deposition behavior of metal oxide aerosols in a 3.6 m long stainless steel piping test assembly. This assembly consisted of divergent and convergent sections, horizontal and vertical sections and right angle bends. Tin oxide aerosols, generated by a plasma torch aerosol generator, were transported into the test assembly using argon carrier gas. Temperature sensors coupled to data loggers were used to record the pipe inner wall and carrier gas temperatures. The experimental deposition results were found to be within 8% of those estimated by the SOPHAEROS module of the accident analysis code ASTEC (Accident Source Term Evaluation Code). Code results for experimental input parameters showed that for sections at higher temperature gradients the dominant deposition mechanism was thermophoresis, while in sections for low thermal gradients, gravitational settling dominated. The micrographs obtained using Transmission Electron Microscopy (TEM) showed that the deposited Tin oxide particles were mostly spherical and bimodal in nature. The X-ray diffraction (XRD) analysis showed that plasma torch generated aerosols exhibit tetragonal SnO and SnO2 phases. (C) 2013 Elsevier Ltd. All rights reserved.
 
Publisher PERGAMON-ELSEVIER SCIENCE LTD
 
Date 2014-12-29T05:02:28Z
2014-12-29T05:02:28Z
2014
 
Type Article
 
Identifier ANNALS OF NUCLEAR ENERGY, 64107-113
0306-4549
http://dx.doi.org/10.1016/j.anucene.2013.09.032
http://dspace.library.iitb.ac.in/jspui/handle/100/17143
 
Language English