Experiment on Local Power Peaking in BWR Type Fuel Assembly

Iwao KOBAYASHI; Harumichi TSURUTA; Shojiro MATSUURA

doi:10.3327/jnst.12.650

Iwao KOBAYASHI, Harumichi TSURUTA, Shojiro MATSUURA

著者情報

キーワード: local power peaking, BWR type reactors, fuel assembly, gamma scanning, critical assembly TCA, uranium dioxide, fuel rods, enrichment, enriched uranium, power depression effect, power flatness, mock-up, JPDR, core

ジャーナルフリー

1975 年 12 巻 10 号 p. 650-657

DOI https://doi.org/10.3327/jnst.12.650

詳細

抄録

Local power peaking was measured by γ-scanning in BWR type fuel assemblies under cold clean conditions using the zero-power critical facility TCA. The horizontal power distribution in an assembly was examined on several loading patterns made up of 1.9, 2.1, 2.3 and 2.6% ²³⁵U enriched UO₂ fuel rods. The power depression was correlated with the lowered value of ²³⁵U enrichment in a fuel rod loaded in the assembly to replace one of normal enrichment. The results show that the local power peaking factor can easily be depressed down to 1.3 by suitable arrangement of depleted fuel rods in the assembly, while more elaborate manipulation is required to reduce it below 1.2.

責任著者(Corresponding author)

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