Abstract
The migration area, multiplication factor, and axial as well as radial reflector savings of a light water moderated critical assembly fueled with UO2 (enriched to 2.596 w/o in 235U) have been obtained through water height experiment applying the one group diffusion model. The water height was varied from 1,226 mm to 710 mm, while the core radius was changed from 183.3 mm to 196.8 mm in order to maintain the criticality. The linear relation obtained between the water height h and (∂p/∂h)-1/3 as well as between the radial buckling Br and the axial buckling B 2 γ indicate that the one group diffusion model is a good approximation for this core.
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