Doryokuro Kakunenryo Kaihatsu Jigyodan

Yoshitsugu Mishima

Kiyozumi Hayashi

Kazushige Domoto

Naoaki Takahashi

A spacer for supporting a plurality of fuel rods forming a nuclear fuel assembly. The spacer comprises a peripheral band surrounding a bundle of the fuel rods and a plurality of spacer framework units, each holding therein one fuel rod. The spacer framework units are welded or brazed to the peripheral band so as to be arranged inside the peripheral band. Spring members are integrally formed on each of the spacer framework units. The spacer framework units, the spring members and the peripheral band are made of a zirconium alloy containing 5-25% by weight niobium and 0.1-1% by weight chromium and/or iron.

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Tokyo, Japan

Yoshitsugu Mishima