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Abstract
The effect of nonuniform distribution of void fractions within fuel assemblies of BWR cores on the neutronic characteristics has been evaluated by coupling the thermal hydraulic and neutronic calculations. It is found that the effect is large for assemblies with Gd rods because of the small void fraction in subchannels near Gd rods. The axially averaged k ∞ is decreased by about 0.1–0.3% Δ k/k compared with the case with uniform void distribution. The power peaking is decreased by 0.6–1.3%. The reason of these changes is discussed.