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Bundle-like control rod structure

A technology of control rods and beams, which is applied in the field of nuclear reactor technology research, can solve the problems of reducing reactor economy and safety, and the small increase in neutron absorption capacity, so as to weaken the space self-shielding effect, reduce the contact area, and improve the reaction. The effect of sexual control

Active Publication Date: 2017-01-04
NUCLEAR POWER INSTITUTE OF CHINA
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Problems solved by technology

[0006] The invention provides a beam control rod structure, which solves the problem that the existing control rods and combustible poison rods have a small increase in neutron absorption capacity, which easily causes relatively large reactivity penalties, and reduces the economy and safety of the reactor. The technical effect of improving the reactivity control ability, reducing the reactivity penalty of burnable poison rods at the end of life, and improving the economy and safety of small reactors

Method used

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Embodiment 1

[0029] In Example 1, please refer to Figure 1-Figure 3 , This application provides a beam-shaped control rod structure for use in a small reactor, the control rod structure includes:

[0030] The bundled control rod 5 is composed of a plurality of sub-control rods 4, and a plurality of binding rings 3 are sleeved on the bundled control rod to fix the sub-control rods.

[0031] In such figure 1 In the layout diagram of a single control rod 2 (combustible poison rod) assembly of a small and medium-sized reactor shown in the prior art, the outer diameter of the fuel rod is 9.5 mm, the grid pitch is 12.7 mm, and the fuel rods are arranged in a 16×16 grid. Each guide tube 1 occupies 4 grids, and a total of 9 guide tubes are arranged with an outer diameter of 26.0 mm and an inner diameter of 24.0 mm. The outer diameter of the control rod (flammable poison rod) is 21.0mm, and the outer surface area of ​​the control rod (flammable poison rod) per unit height is about 66.0mm2.

[0032] In ...

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Abstract

The invention discloses a bundle-like control rod structure applied to a small reactor. The bundle-like control rod structure comprises a bundle-like control rod consisting of multiple sub control rods, the bundle-like control rod is sleeved with multiple binding rings for fixing the sub control rods, and technical effects that the reactivity control capacity is improved, reactivity punishment of burnable poison rods at the end of the service life is reduced and the economy and safety of the small reactor are improved are realized.

Description

Technical field [0001] The invention relates to the technical research field of nuclear reactors, in particular to a beam-shaped control rod structure. Background technique [0002] Small reactors have a wide range of uses, such as power supply in remote areas and islands, seawater desalination or cogeneration of hydropower. In order to simplify the system, achieve compact layout, and reduce construction costs, small reactors usually use solid control rods and combustible poison rods for back-up reactivity control to achieve fast and flexible power regulation, instead of using the soluble boron control system commonly used in nuclear power plants. However, the number of guide tubes for inserting control rods and combustible poison rods in the core layout is extremely limited. The core design must also meet the stringent requirements of the "sticking rod criterion" (that is, when the core is When outside the reactor, the remaining control rods are all inserted into the bottom of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G21C7/04G21C7/117G21C3/328
CPCG21C3/328G21C7/04G21C7/117Y02E30/30
Inventor 夏榜样甯忠豪
Owner NUCLEAR POWER INSTITUTE OF CHINA
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