초록

A nuclear fuel element comprising a fuel body formed of nuclear fuel material and a clad for covering the fuel body. The clad is formed of an austenitic stainless steel containing silicon, titanium and carbon, respectively, in a controlled quantity.

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A nuclear fuel element comprising a fuel body formed of nuclear fuel material and a clad covering the fuel body, the clad being formed of an austenitic stainless steel consisting essentially of nickel, chromium, silicon in an amount of more than 0 to less than 0.7% by weight, carbon and titanium in

A nuclear fuel element comprising a fuel body formed of nuclear fuel material and a clad covering the fuel body, the clad being formed of an austenitic stainless steel consisting essentially of nickel, chromium, silicon in an amount of more than 0 to less than 0.7% by weight, carbon and titanium in amounts satisfying the relationship: 17[C]+27[Ti]≥2.1 where [C]represents the carbon content in % by weight and [Ti]the titanium content in % by weight, with the carbon content falling within the range 0.01 to 0.1% by weight and the titanium content falling within the range 0.03 to 0.5% by weight, and the balance of iron, wherein said austenitic stainless steel is subjected to a final heat treatment at a temperature enough to permit the carbon and titanium to be formed substantially completely into a solid solution.