Multi-maze type fuel transfer channel shielding structure

A channel shielding and labyrinth technology, which is applied in the field of multiple labyrinth fuel transfer channel shielding structures, can solve the problem of affecting the anti-seismic performance of the fuel transfer channel shield, maintenance and replacement, restrictions on the flow of people and logistics, and threats to the integrity of the fuel transfer channel shield and other problems, to achieve the effect of reducing the workload of maintenance and repair inspection, high-level shielding and protection effect, and good inherent safety

CN108417285APending Publication Date: 2018-08-17CHINA NUCLEAR POWER ENG CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2018-08-17

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Abstract

The invention belongs to the technical field of a radiation shielding design of a nuclear island power plant of a nuclear power station, and particularly relates to a multi-maze type fuel transfer channel shielding structure. The structure is used for radiation shielding of a fuel transfer pipe running through a gap between a safety shell and an outer wall of a fuel plant, rays generated by a irradiated fuel assembly transported through the fuel transfer pipe are prevented from leaking out of the gap, the structure includes a plurality of shields disposed on the safety shell and the outer wallof the fuel plant and surrounding the fuel transfer pipe, and the shields are nested with one another to form a seismic telescopic seam of a maze structure. The structure has the advantages of high safety, low cost, less maintenance and good shock resistance.
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Description

technical field

[0001] The invention belongs to the technical field of radiation shielding design for nuclear island powerhouses of nuclear power plants, and in particular relates to a shielding structure for multiple labyrinth fuel transfer channels. Background technique

[0002] Since the third-generation nuclear power plants have increased the limit safety earthquake (not less than 0.3g), a certain distance of seismic expansion joints needs to be left between the fuel transfer channel shields of different plants, which is the focus of radiation protection and shielding design.

[0003] The fuel transfer channel is the channel connecting the reactor refueling pool and the spent fuel storage pool of the fuel plant. It is mainly composed of the fuel transfer tube and the shielding body of the fuel transfer channel. The two ends of the fuel transfer tube are respectively connected with the reactor refueling pool and the spent fuel storage pool. . It is mainly used for equipm...

Examples

Embodiment Construction

[0029] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0030] Such as figure 1 , figure 2 As shown, the present invention provides a multiple labyrinth fuel transfer channel shielding structure, the first-level shielding body 1 , the second-level shielding body 2 , and the third-level shielding body 3 . The multiple labyrinth fuel transfer channel shielding structure is arranged in the gap 9 between the containment vessel 5 and the outer wall 6 of the fuel plant, and is used for transferring the fuel passing through the gap 9 between the containment vessel 5 and the outer wall 6 of the fuel plant The tube 4 performs radiation shielding to prevent the rays generated when the spent fuel assembly 8 is transferred through the section of the fuel transfer tube 4 from leaking out of the gap 9 .

[0031] Among them, the first-level shielding body 1, the second-level shielding body 2, and the third-level shieldi...