Fuel assembly

A fuel assembly comprising:

• a fuel rod having an upper end plug disposed at an upper end portion of the fuel rod;
• and
• a tie plate that supports at least an upper portion of the upper end plug, wherein
• the upper end plug includes a plurality of support protrusions on a surface of the upper end plug, and a closed-loop spring having a portion that is inserted through upper and lower opening portions formed in the upper end plug and is stored in a single space formed in the upper end plug that communicates between the upper and lower opening portions, and a remaining portion protruding to the outside of the upper end plug, and
• the upper end plug is supported by the plurality of support protrusions and the closed-loop spring in a state in which the plurality of support protrusions and the closed-loop spring are in contact with an inner wall of an insertion hole formed in the tie plate.