The fuel assembly includes a base material formed of a zirconium alloy and a coating layer, and the coating layer includes a chromium layer formed of chromium or a chromium alloy and a corrosion-resistant layer formed of zirconium alloy or a titanium alloy. The method for producing a fuel assembly includes a step of preparing the base material, a step of forming the chromium layer on a surface of the base material that would otherwise be in contact with cooling water, a step of forming the corrosion-resistant layer on a surface of the chromium layer, and a step of assembling the fuel assembly using the base material. The chromium layer and the corrosion-resistant layer are formed according to a thin plate cladding method, a physical vapor deposition method, a thermal spraying method, a cold spraying method, or a plating method before the assembling using the base material.

The fuel assembly includes a base material formed of a zirconium alloy and a coating layer, and the coating layer includes a chromium layer formed of chromium or a chromium alloy and a corrosion-resistant layer formed of zirconium alloy or a titanium alloy. The method for producing a fuel assembly includes a step of preparing the base material, a step of forming the chromium layer on a surface of the base material that would otherwise be in contact with cooling water, a step of forming the corrosion-resistant layer on a surface of the chromium layer, and a step of assembling the fuel assembly using the base material. The chromium layer and the corrosion-resistant layer are formed according to a thin plate cladding method, a physical vapor deposition method, a thermal spraying method, a cold spraying method, or a plating method before the assembling using the base material.