Large hatch cover of spent fuel transport ship

Abstract

The invention provides a large hatch cover of a spent fuel transport ship, and belongs to the technical field of ships. According to the large hatch cover of the spent fuel transport ship, each hatch cover is divided into at least two split hatch covers, two anti-radiation shielding layers are arranged inside and at the bottom of each split hatch cover, and two shielding layers need to be arranged at the joint of every two split hatch covers besides conventional weather tightness. Compared with the prior art, the cabin cover has the beneficial effects that as the anti-radiation shielding layer is arranged on the large cabin cover, on the premise that the weather tightness of the cabin cover is not reduced, the cabin cover also has good shielding performance so as to prevent radiation generated by radiation substances in the cabin from penetrating through the cabin cover to threaten external sailors, and the cabin cover is safer, more reliable, simple in structure and convenient to use. The manufacture and installation are convenient, and the purpose of the invention is effectively achieved.

Description

technical field [0001] The invention relates to a shielding structure of a spent fuel transport ship, in particular to a large hatch cover of a spent fuel transport ship, and the invention belongs to the technical field of ships. Background technique [0002] A spent fuel transport ship refers to a transport ship dedicated to transporting spent fuel. Spent fuel is a by-product of nuclear energy utilization, and refers to nuclear fuel that has been burned in a reactor and cannot be used in the reactor. Spent fuel is a highly radioactive item, containing a large amount of radionuclides, including unirradiated proliferative materials, fission nuclides and transuranium nuclides produced by irradiation, which have strong radiation, high calorific value, high toxicity, nuclear The long half-life of the element and the existence of nuclear criticality risks have brought complex issues such as containment, shielding, heat dissipation, and nuclear criticality prevention to its transp...

AI Technical Summary

Problems solved by technology

[0006] Since the deck can be formed after the large cargo hatch cover is closed, it also needs to be watertight, so that the existing large cargo hatch cover has no radiation shielding function, so that the partial shielding penetration of the large cargo hatch cover will be weakened, which will lead to the middle of the cargo hold. Radioactive particles such as radiation particles and γ-rays pass through the large hatch cover of the cargo hold to form radiation leakage beams, which reach the outside of the cargo hold, and further reach the upper deck area through the cargo hold passage, resulting in radiation hot spots in local areas, thereby limiting staff access and area management.

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