a fuel assembly is charged in a reactor core of a nuclear reactor using a liquid metal as a coolant , and includes a wrapper tube storing a plurality of fuel pins and including an entrance nozzle for introducing the coolant and an operation handling head , grids disposed in the wrapper tube to support the fuel pins in the radial direction of the wrapper tube , liner tubes inserted in the wrapper tube to fixedly hold the respective grids in the axial direction of the wrapper tube , and a fixing device for fixing the grids and the liner tubes in the radial direction of the wrapper tube .