Storage grillage for spent fuel assembly

A technology for storing grids and spent fuel, which is applied in the field of nuclear engineering equipment, can solve the problems of lowering the Keff value and not satisfying the storage requirements, and achieves the effect of lowering the Keff value and better positioning the storage tube.

Active Publication Date: 2019-01-18
NUCLEAR POWER INSTITUTE OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at one of the above-mentioned problems, the present invention provides a spent fuel assembly storage grid. Aiming at the problem that the existing spent fuel assemblies cannot be stored satisfactorily, the storage tube for storing spent fuel assemblies and the storage unit of the hexagonal storage tube are set as It is arranged in an equilateral triangle to maximize the use of the space of the storage grid. Boron carbide neutron absorbers are added to the hexagonal storage tubes to reduce the Keff value of the entire system and realize high-density storage of spent fuel assemblies, thus solving the problem of clear fuel Component Storage Issues

Method used

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  • Storage grillage for spent fuel assembly
  • Storage grillage for spent fuel assembly
  • Storage grillage for spent fuel assembly

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Such as figure 1 — Figure 4 As shown, a spent fuel assembly storage grid includes an upper supporting plate 3 and a lower supporting plate 5, and the upper supporting plate 3 and the lower supporting plate 5 are distributed in parallel up and down; the upper supporting plate 3 is provided with a storage tube 2, a hexagonal Shaped storage tube 9, one end of storage tube 2, hexagonal storage tube 9 is connected with supporting plate 3, and the other end of storage tube 2, hexagonal storage tube 9 is all connected with lower supporting plate 5; Storage tube 2, The hexagonal storage tubes 9 are all hollow tubes and are used to store spent fuel assemblies. The number of storage tubes 2 is greater than that of the hexagonal storage tubes 9, and the storage tubes 2 are evenly distributed around the hexagonal storage tube 9. Around, reduce the subcriticality of the whole storage system.

[0027] Wherein, the storage units formed by the storage tubes 2 and the hexagonal stora...

Embodiment 2

[0034] This embodiment is further limited on the basis of Embodiment 1. The upper supporting plate 3 and the lower supporting plate 5 have the same structure, the upper supporting plate 3 is a support plate structure with a quadrilateral cross section, and the four corners of the upper supporting plate 3 are provided with Lug 1. The effect of lifting lug 1 is to be convenient to hoisting the installed storage grid into underwater storage.

Embodiment 3

[0036] The difference between this embodiment and the above embodiment is that: the four legs of the lower supporting plate 5 are provided with adjustable legs 6 , and the non-adjustable legs 7 are arranged between the two adjustable legs 6 . The weight of the whole storage grid will all act on the supporting legs, so the position of the maximum load-bearing of the supporting legs, in order to keep the fuel storage grid leveling in the storage pool, wherein, the four feet of the lower supporting plate 5 can The legs 6 are adjusted, and the two non-adjustable legs 7 between the two adjustable legs 6 are used as fulcrums. By adjusting the length of the adjustable legs 6, the purpose of adjusting the balance of the storage grid is finally achieved.

[0037] Wherein, the adjustment structure of the adjustable leg is composed of a strut nut and a stud, and the strut nut and the stud are threaded to form a spiral pair, and the rotation of the stud drives the up and down movement of t...

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Abstract

The invention discloses a storage grillage for a spent fuel assembly. The storage grillage comprises an upper support plate and a lower support plate; the upper support plate and the lower support plate are distributed in parallel along vertical direction; storage pipes and hexagon storage pipes are arranged on the upper support plate; one ends of the storage pipes and one ends of the hexagon storage pipes are all connected with the upper support plate; the other ends of the storage pipes and the other ends of the hexagon storage pipes are all connected with the lower support plate; the storage pipes and the hexagon storage pipes are all arranged as hollow pipes and are all used for storing the spent fuel assembly; the quantity of the storage pipes is more than the quantity of the hexagonstorage pipes; the storage pipes are uniformly distributed on the periphery of the hexagon storage pipes around the hexagon storage pipes. According to the technical scheme, a storage unit formed by the storage pipes and the hexagon storage pipes is arranged in the form of regular triangle; the effective space of the storage grillage is maximally utilized; the storage pipes are uniformly distributed around the hexagon storage pipes; boron carbide neutron absorber materials in the hexagon storage pipes can reduce the Keff value of the whole system, so that the high-density storage of spent fuelassembly can be realized.

Description

technical field [0001] The invention relates to the technical field of nuclear engineering equipment, in particular to a storage rack for spent fuel assemblies. Background technique [0002] The spent fuel assembly storage rack is an essential equipment for storing spent fuel assemblies in the reactor. At present, the storage grids for storing spent fuel assemblies in nuclear power plants are all designed for bundle-shaped square fuel assemblies, and the storage units are mostly arranged in rectangular arrays, which are not suitable for the storage requirements of research reactor spent fuel assemblies. Therefore, the present invention aims at a research reactor spent fuel assembly, and invents a reliable and effective storage grid, so as to satisfy the safe and reliable storage of the research reactor spent fuel assembly. [0003] Based on this, a storage rack for spent fuel assemblies is researched and developed. Contents of the invention [0004] Aiming at one of the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G21C19/07
CPCG21C19/07Y02E30/30
Inventor 吴瑞李成业王万金宋宏伟廖佳涛吴伟偶建磊王立德邓鹏宇郑海川陈广平杨军季晓林
Owner NUCLEAR POWER INSTITUTE OF CHINA
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