Modeling Film Boiling and Quenching: Modeling Film Boiling and Quenching on the Outer Surface of a Calandria Tube Following a Critical Break LOCA in a CANDU - Couverture souple

Jiang, Jian Tao; Luxat, John C.

 
9783846598504: Modeling Film Boiling and Quenching: Modeling Film Boiling and Quenching on the Outer Surface of a Calandria Tube Following a Critical Break LOCA in a CANDU
Couverture souple
ISBN 10 : 384659850X ISBN 13 : 9783846598504
Editeur : LAP LAMBERT Academic Publishing, 2011

Synopsis

In a postulated critical break LOCA in a CANDU reactor it is possible that heatup of a pressure tube (PT) causes ballooning contact with the calandria tube (CT). Stored heat can cause dryout of the CT and establishment of pool film boiling on the outer surface. The safety concern is that if the temperature of CT experiencing film boiling gets sufficiently high then failure of the fuel channel may occur. However, quench can limit the extent and duration of film boiling as has been experimentally observed. Current estimates of quench temperatures during pool film boiling are based primarily on experimental correlations. In this dissertation a novel mechanistic model of pool film boiling on the outside of CT has been developed. The model is based in part upon characterizing the vapor film thickness under buoyancy driven natural convection flows around a tube located horizontally in a large liquid pool. A transient equation is developed which quantifies the vapor film thickness and other governing parameters. This mechanistic model can be employed in safety analysis to demarcate the conditions under which fuel channel failure will not occur in a postulated critical break LOCA.

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Présentation de l'éditeur

In a postulated critical break LOCA in a CANDU reactor it is possible that heatup of a pressure tube (PT) causes ballooning contact with the calandria tube (CT). Stored heat can cause dryout of the CT and establishment of pool film boiling on the outer surface. The safety concern is that if the temperature of CT experiencing film boiling gets sufficiently high then failure of the fuel channel may occur. However, quench can limit the extent and duration of film boiling as has been experimentally observed. Current estimates of quench temperatures during pool film boiling are based primarily on experimental correlations. In this dissertation a novel mechanistic model of pool film boiling on the outside of CT has been developed. The model is based in part upon characterizing the vapor film thickness under buoyancy driven natural convection flows around a tube located horizontally in a large liquid pool. A transient equation is developed which quantifies the vapor film thickness and other governing parameters. This mechanistic model can be employed in safety analysis to demarcate the conditions under which fuel channel failure will not occur in a postulated critical break LOCA.

Biographie de l'auteur

Mr. Jian Tao Jiang: M.A.Sc, PMP. Worked for AMEC NSS as a safety analyst in Thermal-hydraulic Department from 2007 to 2009. Currently working at Simulator Support Section in Bruce Power.Dr. John C. Luxat: Professor at McMaster University, NSERC/UNENE Industrial Research Chair in Nuclear Safety Analysis, and Board of Directors of AECL.

Les informations fournies dans la section « A propos du livre » peuvent faire référence à une autre édition de ce titre.

Éditeur
LAP LAMBERT Academic Publishing
Date d'édition
2011
Langue
anglais
ISBN 10 
384659850X
ISBN 13 
9783846598504
Reliure
Broché
Nombre de pages
116
Coordonnées du fabricant
non disponible
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