Spent fuel storage unit and stacking type spent fuel storage device

Abstract

The invention discloses a spent fuel storage unit and a stacking type spent fuel storage device. The spent fuel storage unit comprises a storage module and a plurality of corner columns embedded in a plurality of corner angles of the storage module. An accommodating cavity is formed in the storage module; the storage module has opposite front and back surfaces; the plurality of corner columns comprise first corner columns corresponding to the front surface of the storage module and second corner columns corresponding to the back surface of the storage module; the first corner column is provided with an air inlet hole communicated with the accommodating cavity, the back face of the storage module is provided with an emptying hole communicated with the accommodating cavity, and the air inlet hole, the accommodating cavity and the emptying hole are communicated in sequence to form a heat dissipation channel allowing air to pass through and bringing out decay heat of the spent fuel assembly. Through the improved design of the spent fuel storage unit, the spent fuel storage units can be used as basic units to be stacked, meanwhile, all the storage units can achieve distributed independent air inlet and concentrated air exhaust, and multi-layer stacking combination and intensive storage of high-heat-load spent fuel are achieved.

Description

technical field [0001] The invention relates to the technical field of spent fuel storage, in particular to a spent fuel storage unit and a stacked spent fuel storage device. Background technique [0002] Concrete modules (horizontal and vertical) for spent fuel dry storage are used to store and protect fuel storage tanks that seal spent fuel assemblies. As an important item for nuclear safety, the horizontal concrete storage module unit performs nuclear safety functions during long-term storage, including: providing structural protection and radiation shielding for spent fuel storage tanks, and providing air convection channels to fully cool spent fuel storage tanks. [0003] At present, the spent fuel storage units that are widely and maturely used in the world are all internal hollow cuboid reinforced concrete structures, which can be divided into top seats, concrete hoardings, internal support guide rails and door opening covers. Gas and exhaust passages to continuously...

AI Technical Summary

Problems solved by technology

[0004] According to the structural characteristics of the existing spent fuel storage units in the world, the main defects are: only single-layer storage can be adopted, the spent fuel storage facilities occupy a large area, and have high requirements for the social and economic development planning, population centers and traffic roads around the site. The outstanding problems of the spent fuel dry storage have seriously affected the site adaptability and public acceptability of spent fuel dry storage

[0005] Chinese patent CN110534218A discloses a nuclear power plant spent fuel horizontal storage module, which can adopt a double-layer intensive storage design, but the storage capacity is only two layers, and the overall storage capacity is still limited

In addition, the upper module is affected by the heat transfer of the lower module, and it is difficult for the upper module to store spent fuel assemblies with high burnup, high enrichment and high heat load

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