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The variation of particle gas-borne concentration with time in a gas cooled reactor

Abstract

If volatile fission products are released from fuel during a reactor fault, a significant fraction could become attached to small particles also present in the coolant. In such circumstances the retention of those particles by the reactor circuit will limit the level of gas-borne particle concentration and hence be important in reducing the potential release of fission product activity to the atmosphere. Clearly the retention of particles will be influenced by both the deposition and resuspension of particles from surfaces exposed to the coolant flow. In this paper we consider deposition and resuspension but pay particular attention to the role of resuspension, which in the past has been given little consideration. A recently developed model for the resuspension of small particles by a turbulent flow is outlined. Traditionally, resuspension has been interpreted as a force balance between the aerodynamic removal forces and the surface adhesive forces. In contrast, this new approach embodies an energy balance criterion for particle resuspension. Furthermore, the stochastic nature of this new model has shown that resuspension can be sub-divided into two regimes: (i) initial resuspension (resuspension occurring in times less than a second) which reduces the net deposition of particles to a surface; and (ii)  More>>
Authors:
Reed, J; Hall, D; Reeks, M W [1] 
  1. Central Electricity Generating Board, Berkeley Nuclear Laboratories (United Kingdom)
Publication Date:
Jul 01, 1985
Product Type:
Conference
Report Number:
IWGGCR-13
Reference Number:
EDB-01:001739
Resource Relation:
Conference: Specialists' meeting on fission product release and transport in gas-cooled reactors, Berkeley (United Kingdom), 22-25 Oct 1985; Other Information: 23 refs, 7 figs, 1 tab; PBD: 1985; Related Information: In: Specialists' meeting on fission product release and transport in gas-cooled reactors. Summary report, 429 pages.
Subject:
21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS; CONTAMINATION; COOLANT LOOPS; DEPOSITION; FISSION PRODUCT RELEASE; GAS COOLED REACTORS; GAS FLOW; INTEGRO-DIFFERENTIAL EQUATIONS; PARTICLE DECAY; PARTICLE RESUSPENSION; TURBULENT FLOW
OSTI ID:
20113009
Research Organizations:
International Atomic Energy Agency, International Working Group on Gas-Cooled Reactors, Vienna (Austria)
Country of Origin:
IAEA
Language:
English
Other Identifying Numbers:
TRN: XA0056026057127
Availability:
Available from INIS in electronic form
Submitting Site:
INIS
Size:
page(s) 275-298
Announcement Date:

Citation Formats

Reed, J, Hall, D, and Reeks, M W. The variation of particle gas-borne concentration with time in a gas cooled reactor. IAEA: N. p., 1985. Web.
Reed, J, Hall, D, & Reeks, M W. The variation of particle gas-borne concentration with time in a gas cooled reactor. IAEA.
Reed, J, Hall, D, and Reeks, M W. 1985. "The variation of particle gas-borne concentration with time in a gas cooled reactor." IAEA.
@misc{etde_20113009,
title = {The variation of particle gas-borne concentration with time in a gas cooled reactor}
author = {Reed, J, Hall, D, and Reeks, M W}
abstractNote = {If volatile fission products are released from fuel during a reactor fault, a significant fraction could become attached to small particles also present in the coolant. In such circumstances the retention of those particles by the reactor circuit will limit the level of gas-borne particle concentration and hence be important in reducing the potential release of fission product activity to the atmosphere. Clearly the retention of particles will be influenced by both the deposition and resuspension of particles from surfaces exposed to the coolant flow. In this paper we consider deposition and resuspension but pay particular attention to the role of resuspension, which in the past has been given little consideration. A recently developed model for the resuspension of small particles by a turbulent flow is outlined. Traditionally, resuspension has been interpreted as a force balance between the aerodynamic removal forces and the surface adhesive forces. In contrast, this new approach embodies an energy balance criterion for particle resuspension. Furthermore, the stochastic nature of this new model has shown that resuspension can be sub-divided into two regimes: (i) initial resuspension (resuspension occurring in times less than a second) which reduces the net deposition of particles to a surface; and (ii) longer term resuspension (resuspension after 1 second) which determines the asymptotic decay of particle gas-borne concentration. It is seen that the asymptotic decay varies almost inversely as the decay time. Force balance models are unsuccessful in accounting for the experimentally observed longer term resuspension. We show that a Volterra integro-differential equation best describes the variation of particle gas-borne concentration with time in a recirculating gas flow such as a gas cooled reactor. It is seen that the longer term resuspension has a major influence in the final decay of particle concentration. (author)}
place = {IAEA}
year = {1985}
month = {Jul}
}