ISSN Online: 2377-424X
International Heat Transfer Conference 12
Post-calculations of fuel rod bundles reflood experiments with three-dimensional multi-fluid porous media based approach
摘要
The reflooding phenomena are investigated experimentally and numerically in the vertical 4x4-rod
test bundle with one non-heated corner rod. The numerical simulation is performed with the three-dimensional
multi-fluid model based on the porous media approach. Porosity and hydraulic resistance are defined with the
rods' and spacers' positions and dimensions. The stagnant water is boiled-off in the bundle until the high clad
temperature is reached. Than, the water flow is introduced at the bottom of the bundle. Obtained numerical
results show the quenching front propagation along the bundle, transient void distribution, swell level
propagation during the reflood phase, and two-phase mixture flow rates. Numerical results are compared with
the measured data. The quenching front follows the two-phase mixture swell level propagations.