Hitachi, Ltd.

Hiroko Haraguchi

Junichi Koyama

Katsumasa Haikawa

Akihiro Yamanaka

Mitsunari Nakamura

Toshiro Yoshioka

Yoshihiri Iwashita

In an initial core constituted by various kinds of fuel assemblies having a different average enrichment of uranium 235 four fuel assemblies having the lowest average enrichment constitute a square shaped cell. Three fuel assemblies having the highest average enrichment constitute an L-shaped cell, and the L-shaped cell is arranged at corners of the square shaped cells, whereby each assembly of the L-shaped cell adjoins a square shaped cell. The ratio of the number of assemblies of the L-shaped cell to the total number of fuel assemblies in the core is 10% or more.

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Hitachi, Japan

Hiroko Haraguchi