A device for preventing the impact of a fragment jet in a containment vessel of a nuclear power plant

Abstract

The utility model discloses a kind of nuclear power plant safety shell inner anti-fragment jet impact wire slot devices, it is related to nuclear power plant safety system technical field.The utility model includes: protective shell, protective shell surface is connected with fixed component, inside is equipped with wire slot, and buffer component is connected between wire slot and protective shell inner wall;Buffer component includes stabilizing layer, absorption layer and buffer layer, and it is from inside to outside distribution, stabilizing layer inside fills memory alloy grid, absorption layer inside fills the elastic capsule of nanometer ceramic particle.The utility model is by setting protective shell and other structures, the concertina structure of protective shell, honeycomb pit and gradient composite steel material synergistic effect, from changing impact direction, dispersing energy to directly resisting and absorbing impact, form efficient first line of defense, the three-layer structure of buffer component is clear in division of labor, buffer layer, absorption layer, stabilizing layer weaken impact energy in turn and maintain structural stability, multi-dimension improves the ability of device to resist high-speed fragment jet impact.

Description

Technical Field

[0001] This utility model belongs to the technical field of nuclear power plant safety systems, specifically, it relates to a device for preventing debris jet impact inside the containment vessel of a nuclear power plant. Background Technology

[0002] In the safe operation system of a nuclear power plant, the containment vessel is the crucial last line of defense, preventing the leakage of radioactive materials in the event of an accident.

[0003] The cable trays inside the containment vessel carry various cables, which form the nerve network of control and monitoring systems during normal operation and accident conditions of the nuclear power plant. However, in extreme accidents such as core meltdown, high-speed debris jets may be generated, causing severe impacts on the cable trays inside the containment vessel. Once the cable trays are damaged, the cables will fail, seriously affecting the safe operation of the nuclear power plant and accident handling.

[0004] In view of this, this utility model is hereby proposed. Utility Model Content

[0005] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a device for preventing debris jet impact inside the containment of a nuclear power plant, thus solving the problems mentioned in the background art.

[0006] To solve the above-mentioned technical problems, the basic concept of the technical solution adopted by this utility model is as follows:

[0007] A device for preventing debris jet impact inside a nuclear power plant containment vessel includes: a protective shell, a fixing component connected to the surface of the protective shell, a cable groove inside the shell, and a buffer component connected between the cable groove and the inner wall of the protective shell; the buffer component includes a stabilizing layer, an absorbing layer, and a buffer layer, distributed from the inside out; the stabilizing layer is filled with a shape memory alloy mesh, the absorbing layer is filled with an elastic capsule of nano-sized ceramic particles, and the buffer layer has multiple layers of interwoven basalt fiber cloth impregnated with high-temperature resistant silicone, with each layer connected by elastic fibers.

[0008] Optionally, the fixing component includes a fixing frame connected to the surface of the protective shell, with grooves at both the upper and lower ends of the fixing frame, and retractable anchor bolts connected in the grooves.

[0009] Optionally, the retractable anchor bolt consists of two sleeves, an inner sleeve with an elastic protrusion and an outer sleeve with a through hole corresponding to the elastic protrusion.

[0010] Optionally, the protective shell is made of gradient composite steel, with an outer layer of ultra-high strength alloy steel and an inner layer of lower carbon alloy steel with greater toughness.

[0011] Optionally, the protective housing has a multi-segmented zigzag structure and a honeycomb-shaped pit on its surface.

[0012] Optionally, the buffer assembly is connected to the protective housing and the wire groove using a tenon-and-mortise snap-fit ​​structure.

[0013] By adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art. Of course, any product implementing the present invention does not necessarily need to achieve all of the following advantages at the same time:

[0014] 1. By setting up structures such as protective shells, the zigzag structure, honeycomb pits and gradient composite steel of the protective shells work together to change the impact direction, disperse energy and directly resist and absorb impact, forming an efficient first line of defense. The three-layer structure of the buffer component has a clear division of labor. The buffer layer, absorption layer and stabilizing layer weaken the impact energy and maintain structural stability in turn, which improves the device's ability to resist the impact of high-speed fragment jets in multiple dimensions.

[0015] 2. By setting up structures such as fixed components, the telescopic anchor bolts of the fixed components can be flexibly adjusted in length to adapt to different thicknesses of the installation surface. The installation is convenient and the connection is firm. The buffer components adopt a tenon and mortise snap-fit ​​structure, which does not require additional fastening parts. The installation and disassembly are convenient, which greatly saves installation time and maintenance costs and facilitates the later inspection or replacement of the buffer components.

[0016] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings. Attached Figure Description

[0017] The accompanying drawings described below are merely some embodiments. Those skilled in the art can obtain other drawings based on these drawings without any creative effort. In the drawings:

[0018] Figure 1 This is a schematic diagram of the overall structure;

[0019] Figure 2 This is a schematic diagram of the overall structure from another perspective;

[0020] Figure 3 This is a schematic diagram of a partial structure of the inner and outer sleeves;

[0021] Figure 4 A schematic diagram of the cross-sectional structure of the protective shell.

[0022] The attached diagram lists the components represented by each number as follows:

[0023] 1. Protective shell; 2. Fixing bracket; 3. Groove; 4. Inner sleeve; 5. Outer sleeve; 6. Through hole; 7. Elastic protrusion; 8. Cable groove; 9. Stabilizing layer; 10. Absorbing layer; 11. Buffer layer.

[0024] It should be noted that these accompanying drawings and textual descriptions are not intended to limit the scope of the present invention in any way, but rather to illustrate the concept of the present invention to those skilled in the art by referring to specific embodiments. Detailed Implementation

[0025] The present invention will now be described in further detail with reference to the accompanying drawings.

[0026] Please see Figure 1-4 As shown, this embodiment provides a device for a debris jet impact protection trough 8 inside the containment vessel of a nuclear power plant, including: a protective shell 1, a fixing component connected to the surface of the protective shell 1, a trough 8 inside, and a buffer component connected between the trough 8 and the inner wall of the protective shell 1; the buffer component includes a stabilizing layer 9, an absorbing layer 10 and a buffer layer 11, which are distributed from the inside to the outside. The stabilizing layer 9 is filled with a shape memory alloy mesh, the absorbing layer 10 is filled with an elastic capsule of nano-sized ceramic particles, and the buffer layer 11 is provided with multiple layers of interwoven basalt fiber cloth impregnated with high-temperature resistant silicone, and the layers are connected by elastic fibers.

[0027] The protective housing 1 is connected to a fixing component, which allows for convenient and stable installation of the entire device within the containment vessel at a designated location, ensuring stability under various operating conditions. Internally, it features cable trays 8 to accommodate various cables from the nuclear power plant, providing an orderly space for their placement. The buffer assembly includes a stabilizing layer 9, an absorbing layer 10, and a buffer layer 11, arranged from the inside out. The stabilizing layer 9 is filled with a shape memory alloy mesh. Shape memory alloys have a unique shape memory effect; after deformation from impact by fragment jets, they can recover their original shape under certain conditions, continuously providing stable support for the internal structure and ensuring the relative position of the cable trays 8 and cables remains stable, preventing cable damage due to excessive displacement. The absorbing layer 10 is filled with elastic capsules of nano-sized ceramic particles. These nano-sized ceramic particles have high hardness and good toughness. The elastic capsule endows the absorption layer 10 with good deformation capability. When the fragment jet impacts, the nano-sized ceramic particles can effectively disperse the impact energy. The elastic capsule undergoes elastic deformation to absorb part of the energy, greatly reducing the impact on the interior. The buffer layer 11 has multiple layers of interwoven basalt fiber cloth impregnated with high-temperature resistant silicone. The layers are connected by elastic fibers. The basalt fiber cloth itself has high strength, high modulus and excellent high-temperature resistance. The multi-layer interwoven weaving further enhances the structural strength and impact resistance. The impregnated high-temperature resistant silicone can maintain good flexibility in high-temperature environments, enhancing the buffering effect. The elastic fibers connect the layers, so that the buffer layer 11 can deform together when impacted. Through the relative displacement between the layers and the stretching and rebound of the elastic fibers, the impact energy is converted into heat energy and other forms of energy and dissipated, thereby achieving efficient buffering.

[0028] In this embodiment, the fixing component includes a fixing frame 2 connected to the surface of the protective shell 1. The fixing frame 2 has grooves 3 at both the upper and lower ends. A telescopic anchor bolt is connected in the groove 3. The telescopic anchor bolt consists of two sleeves, an inner sleeve 4 and an outer sleeve 5. The inner sleeve 4 has an elastic protrusion 7 and the outer sleeve 5 has a through hole 6 corresponding to the elastic protrusion 7.

[0029] In use, the telescopic anchor bolt consists of two sleeves, an inner sleeve 4 and an outer sleeve 5. The inner sleeve 4 has an elastic protrusion 7, and the outer sleeve 5 has a through hole 6 that matches the elastic protrusion 7. This allows the anchor bolt to be flexibly adjusted in length according to installation requirements. When the elastic protrusion 7 is engaged in the through hole 6 at different positions, the length of the anchor bolt can be fixed. This ensures both the convenience of installation and the stability of the connection between the device and the containment vessel. It can also adapt to installation surfaces of different thicknesses.

[0030] The protective shell 1 is made of gradient composite steel, with an outer layer of ultra-high strength alloy steel and an inner layer of more resilient low-carbon alloy steel. The protective shell 1 has a multi-segment folded structure and honeycomb-shaped pits on its surface. The buffer component is connected to the protective shell 1 and the wire groove 8 by a tenon and mortise snap-fit ​​structure.

[0031] In use, the protective shell 1 is made of gradient composite steel. The outer layer is made of ultra-high strength alloy steel, which can withstand external impacts with its extremely high strength, providing the first line of defense for the device. The inner layer is made of low-carbon alloy steel with greater toughness. When impacted, it can absorb some energy through its own deformation, reducing the impact on the internal cable trays 8 and cables. The complementary properties of the inner and outer layers greatly improve the overall protective performance of the protective shell 1. At the same time, the protective shell 1 has a multi-segment zigzag structure. This structure can change the impact direction of the fragment jet and disperse the impact energy. Compared with a flat structure, it can more effectively reduce the impact force. The honeycomb-shaped pits distributed on the surface further enhance the absorption and buffering of impact energy. The honeycomb structure itself has good impact resistance and shock absorption performance, which can disperse the concentrated impact energy into multiple pit units, thereby weakening the damage of the impact to the shell.

[0032] The buffer assembly is connected to the protective housing 1 and the cable tray 8 using a tenon and mortise snap-fit ​​structure. The tenon and mortise structure has the characteristics of tight connection and high stability, which can ensure that the buffer assembly will not loosen or detach from the protective housing 1 or the cable tray 8 when subjected to impact, thus ensuring the effective performance of the buffering effect. At the same time, this connection method does not require additional fastening parts, and the installation and disassembly are relatively convenient, which facilitates later maintenance and replacement. It saves installation time and cost, and allows for quick inspection or replacement of the buffer assembly when needed.

[0033] Working principle:

[0034] When an extreme accident occurs at a nuclear power plant and a high-speed debris jet is generated, the various parts of the shock-resistant trough 8 device will function sequentially to form multiple protective barriers. First, the debris jet will come into contact with the protective shell 1. The protective shell 1 has a multi-segmented zigzag structure, which can change the impact direction of the debris jet and disperse the impact energy. The honeycomb-shaped pits on its surface will further absorb and buffer some of the impact energy, dispersing the concentrated energy into multiple pit units. At the same time, the gradient composite steel used in the protective shell 1 has an outer layer of ultra-high strength alloy steel that resists external impact with its extremely high strength, while the inner layer of low-carbon alloy steel with stronger toughness absorbs some energy through its own deformation, initially weakening the impact force.

[0035] If there is still residual impact energy transmitted to the buffer assembly, the buffer layer 11 will take effect first. The buffer layer 11 contains multiple layers of basalt fiber cloth interwoven and impregnated with high-temperature silicone. Under impact, each layer deforms in concert through the connection of elastic fibers. The relative displacement between layers and the stretching and rebound of the elastic fibers dissipate some of the impact energy as heat. Next, the nano-sized ceramic particle elastic capsule filled in the absorption layer 10 will use the nano-sized ceramic particles to disperse the remaining impact energy. The elastic capsule undergoes elastic deformation to further absorb energy, greatly reducing the impact on the interior. Finally, the shape memory alloy mesh in the stabilizing layer 9 will restore its original shape after slight deformation, continuously providing stable support for the cable tray 8 and the internal cables, ensuring their relative position is stable.

[0036] Throughout the process, the fixing components securely fix the device inside the containment shell using retractable anchor bolts. The elastic protrusion 7 engages with the through hole 6 of the outer sleeve 5 to fix the length, ensuring that the device will not shift under impact. The buffer components are connected to the protective shell 1 and the cable tray 8 with tenon and mortise snaps to ensure that the buffer components do not loosen or detach, and to ensure that each buffer link functions in an orderly manner.

[0037] This utility model is not limited to the above-described embodiments. Anyone should know that structural changes made under the guidance of this utility model, and any technical solutions that are the same as or similar to this utility model, fall within the protection scope of this utility model. Technical aspects, shapes, and structures not described in detail in this utility model are all publicly known technologies.

Claims

1. A device for preventing debris jet impact within the containment vessel of a nuclear power plant (8), characterized in that, include: A protective housing (1) has a fixing component connected to its surface and a wire groove (8) inside. A buffer component is connected between the wire groove (8) and the inner wall of the protective housing (1). The buffer assembly includes a stabilizing layer (9), an absorbing layer (10), and a buffer layer (11), which are distributed from the inside to the outside. The stabilizing layer (9) is filled with a memory alloy mesh, the absorbing layer (10) is filled with an elastic capsule of nano-sized ceramic particles, and the buffer layer (11) is provided with multiple layers of basalt fiber cloth that are interwoven and impregnated with high-temperature resistant silicone. The layers are connected by elastic fibers.

2. The device for preventing debris jet impact inside the containment vessel of a nuclear power plant (8) according to claim 1, characterized in that: The fixing component includes a fixing frame (2) connected to the surface of the protective shell (1). The fixing frame (2) has grooves (3) at both the upper and lower ends, and a retractable anchor bolt is connected in the groove (3).

3. A containment inner fragment jet impact channel (8) device for a nuclear power plant according to claim 2, characterized in that: The retractable anchor bolt consists of two sleeves, an inner sleeve (4) with an elastic protrusion (7) and an outer sleeve (5) with a through hole (6) corresponding to the elastic protrusion (7).

4. A containment inner fragment jet impact channel (8) device for a nuclear power plant according to claim 1, characterized in that: The protective shell (1) is made of gradient composite steel, with the outer layer being ultra-high strength alloy steel and the inner layer being low-carbon alloy steel with stronger toughness.

5. A containment inner fragment jet impact channel (8) device for a nuclear power plant according to claim 1, characterized in that: The protective shell (1) has a multi-segmented zigzag structure and honeycomb-shaped pits on its surface.

6. A containment inner fragment jet impact channel (8) device for a nuclear power plant according to claim 1, characterized in that: The buffer assembly is connected to the protective shell (1) and the wire groove (8) by a tenon and mortise snap-fit ​​structure.

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