CN115527695A

CN115527695A - Safety shell

Info

Publication number: CN115527695A
Application number: CN202110709586.9A
Authority: CN
Inventors: 杨小林; 郑之寿
Original assignee: Hualong International Nuclear Power Technology Co Ltd
Current assignee: Hualong International Nuclear Power Technology Co Ltd
Priority date: 2021-06-25
Filing date: 2021-06-25
Publication date: 2022-12-27

Abstract

An embodiment of the present invention provides a containment vessel, including: a containment body and a water tank; a support platform is arranged on the outer wall of the containment body, and the water tank is arranged on the support platform; the containment body comprises a second outlet, and the second outlet is communicated with the inlet. Through the arrangement of the structure, the stability of the containment is improved.

Description

Safety shell

Technical Field

The invention relates to the technical field of nuclear power plant safety, in particular to a containment vessel.

Background

When a large-break reactor coolant loss accident, a main steam pipeline fracture accident and other accident conditions of releasing a large amount of mass and energy to a containment vessel occur in a nuclear power plant, the large amount of mass and energy enter the containment vessel, so that the temperature and the pressure of the containment vessel are rapidly increased, and the containment vessel has the risk of overpressure failure.

In order to ensure the integrity of the containment, a cooling water tank is usually arranged outside the containment, and high-temperature gas to be cooled in the containment passes through the cooling water tank to conduct heat exchange, so that heat in the containment is conducted out. The existing cooling water tank is arranged at the upper part of the containment, and the water tank is easy to damage under the condition that the containment is deformed, so that the system stability is low.

Disclosure of Invention

The embodiment of the invention provides a containment, which can solve the problem of low stability of the containment due to the fact that a water tank is damaged.

In order to solve the technical problem, the present application is implemented as follows:

an embodiment of the present invention provides a containment vessel, including: a containment body and a water tank;

a support platform is arranged on the outer wall of the containment body, and the water tank is arranged on the support platform;

the containment body comprises a second outlet, and the second outlet is communicated with the inlet.

Therefore, the supporting platform is arranged on the outer wall of the containment body, and the water tank is arranged on the supporting platform, so that the stability of the containment is improved.

Drawings

FIG. 1 is a schematic structural diagram of a containment vessel according to an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of a water tank and a supporting plane according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of a ring structure provided by an embodiment of the present invention;

FIG. 4 is a schematic structural diagram of a ring structure and a panel according to an embodiment of the present invention;

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.

Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. The use of "first," "second," and the like, herein does not denote any order, quantity, or importance, but rather the terms "first," "second," and the like are used to distinguish one element from another. Also, the use of the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used only to indicate relative positional relationships, and when the absolute position of the object to be described is changed, the relative positional relationships are changed accordingly.

Referring to fig. 1 and fig. 2, there are shown schematic structural diagrams of a containment vessel according to an embodiment of the present invention, where the containment vessel includes: containment body 10 and water tank 20;

a support platform 30 is arranged on the outer wall of the containment body 10, and the water tank 20 is arranged on the support platform 30;

the water tank 20 is provided with an inlet 21 and a first outlet 22, and the containment body 10 includes a second outlet which is communicated with the inlet 21.

The containment vessel is a nuclear reactor containment vessel, a large amount of radioactive substances can be released when a nuclear reactor of a nuclear power station is in an accident, and the containment vessel is used as a last nuclear safety barrier and can prevent the radioactive substances from diffusing to pollute the surrounding environment. After the nuclear power plant has an accident, a large amount of high-temperature and high-pressure fluid enters the containment vessel in a short time to cause the temperature and the pressure in the containment vessel to rise rapidly, so that the temperature and the pressure in the containment vessel are limited to rise, the situation that the containment vessel fails due to overpressure and the heat in the containment vessel needs to be continuously led out is avoided, and the radioactive substances of the nuclear power plant are prevented from being uncontrollably released to the external environment under the accident condition.

The containment vessel body 10 may have a single-layer structure or a double-layer structure, which is not limited in this embodiment. The supporting platform 30 is arranged on the upper portion of the outer wall of the containment vessel body 10, the water tank 20 is arranged on the supporting platform 30, in order to achieve a cooling effect, generally, the available water content in the water tank 20 is required to be greater than 3000 cubic meters, the design volume is about 3400 cubic meters, and the supporting strength of the supporting platform 30 arranged on the outer wall of the containment vessel body 10 is calculated by an expert. The gas to be cooled in the containment body 10 is released from the second outlet, enters the water tank 20 through the inlet 21, is liquefied after heat is conducted out to the water tank 20, and flows back to the containment body 10 from the first outlet 22, so that the stability of the containment is improved by continuously conducting out the heat.

In this way, the support platform 30 is disposed on the outer wall of the containment body 10, and the water tank 20 is disposed on the support platform 30, thereby improving the stability of the containment.

Alternatively, the water tank 20 includes a first tank 23 and a second tank 24 communicating with each other;

the support platform 30 is a support surface extending from the outer wall of the containment body 10 in a direction away from the containment body 10, the second box 24 is disposed on the support surface, and the first box 23 is disposed on the second box 24.

The support platform 30 may be a planar structure that is additionally disposed on the outer wall of the containment body 10 in the later stage, or may be a planar structure that is integrally formed with the containment body 10, which is not limited in this embodiment. The plane of the second water tank 20 contacting the support platform 30 is a support surface, and the bottom of the second water tank 20 should be completely located in the support surface, and in addition, the support surface and the exterior of the containment body 10 should be arranged at an angle less than or equal to 90 degrees, so as to improve the stability of the second water tank 20 on the support surface.

Optionally, the supporting surface is wound on the outer wall of the containment vessel body 10, the supporting surface is perpendicular to the containment vessel body 10, the supporting surface includes a first supporting surface 31 and a second supporting surface 32, and the second supporting surface 32 is sunk toward the bottom of the containment vessel body 10 by a preset distance;

the first casing 23 is disposed on the first supporting surface 31, and the second casing 24 is disposed on the second supporting surface 32.

In this embodiment, the second supporting surface 32 is set to sink toward the bottom of the containment native, and the second box 24 communicated with the first box 23 is set on the second supporting surface 32, so as to limit the displacement of the first box 23 on the first supporting surface 31 and improve the stability of the box on the supporting surface. In addition, the settling distance may coincide with the vertical height of the first casing 23 on the first supporting surface 31, so that the first casing 23 coincides with the vertical height of the second casing 24.

Optionally, the second box 24 includes a plurality of sub-boxes communicated with the first box 23, and the plurality of sub-boxes are uniformly disposed on the first box 23.

In this embodiment, the second box 24 includes a plurality of sub-boxes, and each sub-box is communicated with the first box 23, so that the stability of the box on the supporting surface is improved. In addition, the plurality of sub-boxes uniformly arranged on the first box 23 further satisfy the structural requirements.

Optionally, each of the sub-tanks is provided with an inlet 21 and a first outlet 22, and each of the inlets 21 is communicated with the second outlet.

Each sub-tank is provided with an inlet 21 and a first outlet 22, and the inlet 21 on each sub-tank is communicated with a second outlet on the containment body 10, wherein the number of the second outlets may be one or the same as that of the sub-tanks, which is not limited in this embodiment. The high-temperature gas released from the second outlet of the containment body 10 enters each sub-tank body from the inlet 21 of each sub-tank body, is liquefied after being cooled, and is discharged from the first outlet 22 of each sub-tank body, thereby improving the cooling efficiency.

Optionally, the containment vessel further includes a condenser 40 disposed within the sub-tank.

The condenser 40 is also a heat exchanger, which can condense the gas or vapor to be cooled into liquid to achieve the effect of refrigeration, and the operation process of the condenser 40 is a heat releasing process, so that the temperature of the condenser 40 is high. In this embodiment, the condenser 40 is disposed in each sub-tank, two ends of the condenser 40 are respectively communicated with the inlet 21 and the first outlet 22, and the gas to be cooled leads out heat of the condenser 40 through cooling water in the water tank 20, so as to achieve the purpose of rapid heat dissipation.

Optionally, the water tank 20 is made of steel.

In this embodiment, since the water tank 20 has a large volume, the water tank 20 using the steel material support has a light weight compared to the civil external water tank 20. In addition, the steel structure water tank 20 can be prefabricated in a segmented mode in a factory and assembled and installed on site, and construction period can be shortened. In addition, the steel structure external hanging water tank 20 can solve the problem that the deformation of the containment vessel generated by prestress and pressing tests influences the water tank 20.

Optionally, the supporting platform 30 is made of steel material and concrete material.

Specifically, the supporting platform 30 may be a steel structure, a reinforced concrete structure, or a prestressed concrete structure, and the supporting platforms 30 of the three structures all have better strength and can provide supporting force for the water tank 20, which is not limited in this embodiment.

As shown in fig. 3 and 4, the water tank 20 may alternatively include a ring-shaped bracket 25 formed by splicing a plurality of frame units, and a panel 26 covering the ring-shaped bracket 25.

In this embodiment, the annular bracket 25 may be spliced on site according to the shape and size of the containment body 10, so that flexibility is improved and economy is also improved. The frame unit constituting the ring holder 25 may have a square frame structure, a rectangular frame structure, or the like, but is not limited to this embodiment. The panel 26 covering the ring-shaped bracket 25 may be spliced, and waterproof materials may be provided on the inner and outer sides of the panel 26 to improve the sealing property of the water tank 20.

Optionally, the frame unit includes a plurality of frame faces and pole setting subassembly that mutual parallel arrangement, the pole setting subassembly includes a plurality of parallel arrangement's pole setting, each frame face is connected through a plurality of pole settings in a plurality of frame faces, pole setting and the perpendicular setting of frame face.

In this embodiment, through setting up a plurality of frame faces, a plurality of pole setting, and every frame face all is connected with a plurality of pole settings are perpendicular to improve frame cell's intensity, improve water tank 20's compressive strength.

While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. A containment vessel, comprising: a containment body and a water tank;

2. The containment vessel of claim 1 wherein the water tank comprises a first tank and a second tank in communication with each other;

the support platform is a support surface extending from the outer wall of the containment body along the direction far away from the containment body, the second box body is arranged on the support surface, and the first box body is arranged on the second box body.

3. The containment vessel of claim 2 wherein the support surface is disposed around an outer wall of the containment vessel body, the support surface being perpendicular to the containment vessel body, the support surface comprising a first support surface and a second support surface, the second support surface being recessed a predetermined distance toward a bottom of the containment vessel body;

the first box body is arranged on the first supporting surface, and the second box body is arranged on the second supporting surface.

4. The containment vessel of claim 2 wherein the second tank includes a plurality of sub-tanks in communication with the first tank, the plurality of sub-tanks being evenly disposed on the first tank.

5. The containment vessel of claim 4 wherein each of the sub-tanks is provided with an inlet and a first outlet, and each of the inlets is in communication with the second outlet.

6. The containment vessel of claim 4 further comprising a condenser disposed within the sub-tank.

7. The containment vessel of claim 1 wherein the tank is fabricated from a steel material.

8. The containment vessel of claim 1 wherein the support platform is fabricated from a steel material or a concrete material.

9. The containment vessel of claim 1 wherein the water tank comprises a ring-shaped bracket formed by splicing a plurality of frame units, and a panel overlying the ring-shaped bracket.

10. The containment vessel of claim 9 wherein the frame unit comprises a plurality of frame faces arranged parallel to each other and a riser assembly comprising a plurality of parallel arranged risers, each frame face of the plurality of frame faces connected by a plurality of risers arranged perpendicular to the frame face.