Abstract
In order to improve predictability of detailed void distributions in BWR fuel bundles, the Lahey's void settlement model has been modified by implementing the anisotropic void diffusion coefficient that is determined based on the detailed velocity reconstruction model. Through CFD analyses and existent velocity measurements in rod bundles, the wall law was applied as the basic physical mechanism of this reconstruction model. The improved void settlement model was verified based on the past partial bundle void distribution database, GE3x3 and ISPRA4x4.
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