Fuel storage tank for nuclear power plant spent fuel dry-type storage

Abstract

The invention discloses a fuel storage tank for nuclear power plant spent fuel dry-type storage. The fuel storage tank comprises a storage tank body and a storage tank support structure fixed at the periphery of the storage tank body. The storage tank body comprises a cylinder, an outer top cover, an inner top cover, a flange and a base plate. The base plate is fixedly connected at the bottom of the cylinder. The flange is fixedly connected at the top of the cylinder. The top of the flange is equipped with a step sealing surface. The inner top cover and the outer top cover are connected with different steps of the step sealing surface of the flange through bolts. Compared with the prior art, the fuel storage tank employs a flange-type top cover structure, thus the fuel storage tank top cover sealing performance is ensured, and the sealing operation difficulty is lowered. A spent fuel assembly can be loaded and taken out and recycle of the fuel storage tank can be achieved.

Description

technical field [0001] The invention relates to the field of nuclear power plant spent fuel dry storage, and more specifically, the invention relates to a fuel storage tank for spent fuel dry storage. Background technique [0002] At present, the mainstream dry storage scheme for spent fuel in the world is the concrete silo storage scheme, and its basic container includes two fuel storage tanks and concrete silos. Among them, the fuel storage tank is used to load spent fuel components and contain radioactivity. It is generally a steel sealed container filled with a certain pressure of inert gas to provide an inert storage environment for spent fuel components; concrete silos are used to store fuel storage tanks , provide the function of shielding and physical isolation, and conduct the heat release inside the fuel storage tank in a passive way. [0003] The main functions of the fuel storage tank are: 1) providing a seal to contain radioactive substances; 2) providing struc...

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Problems solved by technology

[0004] Although sealing the fuel storage tank by welding can achieve good sealing performance, there are still the following three major problems: 1) After the fuel storage tank is loaded with spent fuel assemblies, the top cover 54 and the barrel 55 need to be welded, and personnel The radiation dose received when welding the top cover 54 is relatively large; 2) After the fuel storage tank is stored in the concrete silo for a certain number of years, it is necessary to reprocess the spent fuel assembly. At this time, it is necessary to use a special cutting tool to clean the fuel storage tank The spent fuel assembly can only be retrieved after the top cover 54 is removed, and the cutting operation will also cause the operator to bear a large radiation dose; 3) After the fuel storage tank is cut, due to the local structure of the welding part At the same time, it has a certain degree of radioactivity, so that it is difficult to reprocess the welding groove, so the fuel storage tank cannot be reused, and it can only be treated as radioactive waste after it is used once.

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