초록 ▼

Disclosed are a cladding tube for a nuclear fuel and a nuclear fuel element incorporating the cladding tube. The cladding tube consists of an inner zirconium liner layer and an outer zirconium alloy layer. The cladding tube has at least one of the following features: (I) the ratio a/b of the oxygen

Disclosed are a cladding tube for a nuclear fuel and a nuclear fuel element incorporating the cladding tube. The cladding tube consists of an inner zirconium liner layer and an outer zirconium alloy layer. The cladding tube has at least one of the following features: (I) the ratio a/b of the oxygen content a to iron content b in the zirconium liner layer is greater than 1.0, (II) the zirconium liner layer is made of a zirconium into the matrix of which impurities are dissolved, and (III) the second phase particles having microscopic sizes and dispersed in the inner surface of the zirconium liner layer and/or the outer surface of the zirconium alloy layer have been removed substantially. Owing to these features, undesirable stress corrosion cracking and local corrosion are remarkably suppressed in the cladding tube and the nuclear fuel element of the invention.

대표청구항 ▼

A cladding tube for nuclear fuel comprising an inner zirconium liner layer and an outer zirconium alloy layer, characterized in that said inner zirconium liner layer contains iron and oxygen as impurities, and that the ratio a/b of the oxygen content a to the iron content b in said zirconium liner l

A cladding tube for nuclear fuel comprising an inner zirconium liner layer and an outer zirconium alloy layer, characterized in that said inner zirconium liner layer contains iron and oxygen as impurities, and that the ratio a/b of the oxygen content a to the iron content b in said zirconium liner layer is greater that 1.0 so as to provide a liner layer having both decreased stress corrosion cracking susceptibility and increased mechanical strength as compared to liner layer of zirconium in which said ratio is not greater that 1.0.