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Reactor pressure vessel integral top cover with inner platform

A technology for pressure vessels and reactors, applied in reactors, greenhouse gas reduction, nuclear power generation, etc., can solve problems such as out-of-tolerance verticality of tube sockets, achieve weld seam elimination, good shielding effect, and control tube socket position and verticality Effect

Inactive Publication Date: 2018-12-21
NUCLEAR POWER INSTITUTE OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the problem of out-of-tolerance verticality of the pipe seat caused by traditional asymmetric welds on the basis of low-cost integrated forging

Method used

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  • Reactor pressure vessel integral top cover with inner platform
  • Reactor pressure vessel integral top cover with inner platform
  • Reactor pressure vessel integral top cover with inner platform

Examples

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Effect test

Embodiment 1

[0033] The implementation structure of the present invention is:

[0034] An integral top cover of a reactor pressure vessel with an inner platform, including an integrated flange 1 and a spherical head 2, and a platform structure 3 is integrally forged on the concave spherical surface of the spherical head, so that the spherical head 2 The concave spherical surface gradually changes from a continuously changing arc surface to a plane and then gradually changes to a continuously changing arc surface. The platform structure 3 is a solid body enclosed by a spherical surface and a circular plane. The spherical surface of the platform structure 3 and the spherical surface The concave spherical surface of the head is integrally matched and connected, and the circular plane of the platform structure 3 is set horizontally, and the height of the circular plane in the vertical direction is higher than the height of the upper end surface of the flange in the vertical direction, and also ...

Embodiment 2

[0046] In this embodiment, on the basis of Example 1, the thickness of the weld seam of the pipe seat is selected to be 2 to 5 mm, the diameter of the weld seam of the pipe seat is 2-5 mm, and the diameter size is the outer diameter size and the inner diameter size Difference. With this size, the welding stress of the weld seam is small, so it can well solve the problem that the position and verticality of the pipe seat after welding are easy to be out of tolerance. And as figure 1 , figure 2 The size of the special-shaped asymmetric weld is generally more than 10mm in diameter, and the depth (thickness of the weld) is more than 20mm. The welding stress of this weld is very large, and it is very difficult to weld. It is easy to be out of tolerance.

Embodiment 3

[0048] Although a platform structure is formed, the continuous gradual arc of the spherical head is not continuously gradual, which will cause a discontinuous inflection point platform structure of the material, that is, the difference between the circular plane and the remaining continuous arc surfaces of the spherical head The junction will form a discontinuous inflection point of the material, which will affect the compressive performance of the entire structure to a certain extent. However, the present invention effectively reduces the weld seam of the pipe seat through the above-mentioned platform structure, and at the same time improves the verticality of the pipe seat. In this case, when the tube base is under pressure, the force from all directions is uniform, so it will promote the uniform pressure of the entire top cover, so it can make up for the above-mentioned compression resistance. In order to reduce the impact caused by the discontinuous inflection point of the a...

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Abstract

The invention discloses a reactor pressure vessel integral top cover with an inner platform, comprising an integrated flange and a spherical head. A platform structure is integrally forged on the concave spherical surface of the spherical head, so that the concave spherical surface of the spherical head is gradually changed from a continuously gradual curved surface to a flat surface and then gradually changed to a continuous gradual curved surface. The platform structure is a solid body defined by a spherical surface and a circular plane, wherein the spherical surface of the platform structure and the concave spherical surface of the spherical head are integrally matched and connected, the circular plane of the platform structure is horizontally arranged, and the height of the circular plane in the vertical direction is higher than the height of the upper end surface of a flange in the vertical direction. The reactor pressure vessel integral top cover also comprises a tube socket mounting through hole penetrating through the spherical head and the platform structure, a tube socket inserted into the tube socket mounting through hole, and a circular tube socket weld, wherein the tube socket weld is arranged on the platform structure and covers the tube socket. The problem that vertical deviation of the tube socket caused by the traditional asymmetric weld is out of tolerance issolved.

Description

technical field [0001] The invention relates to the field of reactor pressure vessels, in particular to the reactor pressure vessel top cover technology. Background technique [0002] The top cover assembly is an important part of the reactor pressure vessel. For a long time, because the reactor pressure vessel needs to bear huge pressure, the guiding ideology in this field is that when a shell needs to bear huge pressure, generally a spherical head is used, and the material of the spherical head is required to be continuous. , The inner concave surface gradually changes to form an inner concave arc surface, which can meet the high performance and high pressure requirements. Therefore, whether it is a split top cover assembly or an integrated top cover assembly, it has a spherical head, and the inner concave surface of the spherical head is a continuous and gradually changing inner concave arc surface. Such a design makes it possible to form a special-shaped weld seam stru...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G21C13/02G21C13/028
CPCG21C13/02G21C13/0285Y02E30/30
Inventor 彭航尹祁伟陈海波宋小明罗英杜华王小彬张亚斌李玉光付强谢细明邱阳杨志海王昫心
Owner NUCLEAR POWER INSTITUTE OF CHINA
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