inner surface of a cladding and a manufacturing method thereof the nuclear fuel rod for fast reactors which includes the oxide coating layer formed on the inner surface of the cladding can increase the maximum permissible burnup and maximum permissible temperature of the metallic fuel slug for fast reactors so as to prolong the its lifecycle in the fast reactors thus increasing economic efficiency also the fuel rod is manufactured in a simpler manner compared to the existing method in which a metal liner is formed and the disclosed method enables the cladding of the fuel rod to be manufactured in an easy and cost effective way application_number US 11077508 A description the present invention provides a nuclear fuel rod for fast reactors which includes an oxide coating layer formed on the inner surface of cladding the cladding of a nuclear fuel rod for typical fast reactors may generally be made of high chromium stainless steel having a chromium content of 8 12 wt on the inner surface of the high chromium stainless steel cladding tube the oxide coating layer according to the present invention is easily formed the oxide coating layer consists of chromium oxide cr 2 o 3 vanadium oxide v 2 o 3 or zirconium oxide zro 2 which have low reactivity with the constitutional elements of the high chromium stainless steel cladding tube and the constitutional elements of the metallic fuel slug furthermore the oxides have a.