The invention discloses a
fuel storage tank for dry type storage of spent fuel of a
nuclear power plant, which aims at solving the technical problem of higher difficulty in the
top cap covering process under water in the existing
fuel storage tank structure. The
fuel storage tank comprises an opening container, a
top cap and a sealing ring, wherein the
top cap comprises a shielding cap and an air intake
assembly, the shielding cap is matched with an opening of the container, and the air intake
assembly is arranged on the shielding cap; a water drainage notch and an annular groove are dug in the shielding cover, and the annular groove is used for placing the sealing ring; the container comprises a bottom plate, a cylinder body, a water drainage
assembly, a support structure and hanging lugs, one end part of the cylinder body is in sealed
welding with the bottom plate, the water drainage assembly is arranged at the inside wall of the cylinder body, the support structure is used for supporting a fuel basket, and the hanging lugs are used for supporting the shielding cap; when the shielding cap is hung at and covers the other end part of the cylinder body, the air intake assembly is used for providing an air intake passage for the cylinder body, and the water drainage assembly is butted with the water drainage notch, and is used for draining the liquid out of the container. The fuel
storage tank has the advantages that the operation difficulty in covering the top cap under water is decreased, and the spent fuel assembly can be reliably loaded and stored.