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Transport Theory and Statistical Physics Volume 33, 2004 - Issue 3-4: Special Issue Comprised of Refereed Papers Based on Presentations at the Eighteenth International Conference on Transport Theory—Part I
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Original Articles

Effect of Nonuniform 3‐D Void Distribution Within BWR Fuel Assemblies on Neutronic Characteristics

Toshikazu Takeda Department of Nuclear Engineering, Osaka University, Yamadaoka 2‐1 Suita, Osaka, JapanCorrespondence[email protected]
,
Hideaki Hyoudou Department of Nuclear Engineering, Osaka University, Yamadaoka 2‐1 Suita, Osaka, Japan
,
Takanori Kitada Department of Nuclear Engineering, Osaka University, Yamadaoka 2‐1 Suita, Osaka, Japan
,
Shinya Kosaka Tepco Systems Corporation, Shimbashi Minato‐ku, Tokyo, Japan
&
Hideaki Ikeda Tepco Systems Corporation, Shimbashi Minato‐ku, Tokyo, Japan
Pages 299-310 | Published online: 15 Aug 2006
 
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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.

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