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Research Papers: Nuclear Power

Material Properties’ Influence in Fuel-Coolant Interaction Codes

[+] Author and Article Information
Mitja Uršič, Matjaž Leskovar, Borut Mavko

 Jožef Stefan Institute, Jamova cesta 39, 1001 Ljubljana, Slovenia

J. Eng. Gas Turbines Power 132(7), 072901 (Apr 26, 2010) (7 pages) doi:10.1115/1.4000339 History: Received July 20, 2009; Revised September 03, 2009; Published April 26, 2010; Online April 26, 2010

The melt droplets’ crust formation modeling, which is used in current fuel coolant interaction (FCI) codes, is rather basic. In the paper the development of the melt droplet heat transfer model, which enables the treatment of the material properties’ influence on the steam explosion, is presented. The model is complex enough to adequately predict the crust development during the melt droplets’ cooling in the premixing phase. At the same time the model is simple enough that it can be practically implemented into FCI codes and is thus being an optimal model for FCI applications. Fragmentation criteria are derived in order to take into account the influence of the formed crust on the steam explosion process. The derived criteria are based on experimental results and the thin plate approximation. To enable the use of the model and the fragmentation criteria in FCI codes with Eulerian formulation, adequate transport equations for model parameters are given.

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Copyright © 2010 by American Society of Mechanical Engineers
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Figures

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Figure 1

Promoting (left) and inhibiting (right) influence of material properties on the steam explosion (5,7)

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Figure 3

Temperature profiles for corium (a) and alumina (b) at different times

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Figure 4

Crust layer thickness time evolution for corium (a) and alumina (b)

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Figure 5

Map of melt droplet fragmentation phenomena for various water velocities depending on crust thickness (11)

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Figure 6

Schematic view of droplets’ solid layer fragmentation mechanisms

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Figure 7

Deformation (a) and shear (b) fragmentation criteria used for crust thicknesses smaller (a) and larger (b) than the critical crust thickness

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