Abstract
Under the accident condition, the loss of the continuous flow of coolant through the channel and the associated oxidative clad-steam chemical reaction causes an increase in the temperature of the fuel assemblies. If the moderator subcooling margin is insufficient, the channel may overheat to the point where the bundle assembly is jeopardized, and the fuel elements collapse onto the bottom of the Pressure Tube (PT). The present study aims to perform the numerical modeling of a severely degraded channel under steam flow condition from the thermal point of view. The configuration and the parameters employed in the study have been taken from the experiment. The energy equation incorporates all types of heat transfer, as well as secondary heat generated during the clad-steam oxidation reaction. The axial and circumferential temperature distribution has been obtained for the cladding, PT and Calandria Tube (CT), and compared with the experimental data. The predicted results are found to be in line with the experimental results, with the exception of the temperature excursion in the Fuel Bundle simulator (FBS) downstream of the coolant.
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