Foreign matter prevention blocking plate suitable for primary side of nuclear power station steam generator

Abstract

The utility model provides an anti-foreign-matter blocking plate suitable for the primary side of a steam generator in a nuclear power station, which comprises a first side panel, a first main panel, a second main panel and a second side panel which are sequentially connected into a circle, the first side panel is connected with the first main panel through a hinge, the first main panel is connected with the second main panel through a hinge, and the second main panel is connected with the second side panel through a hinge; the back face of the first main panel and the back face of the second main panel are each provided with a positioning block, and the back face of the first side panel and the back face of the second side panel are each provided with a positioning arc. After being folded, the device can integrally enter a steam generator water chamber through a primary side manhole of the steam generator, a single person can easily and integrally open the device in the water chamber, the device can be directly placed to a pipe opening of a main pipeline to complete installation, jamming is avoided during installation, adjustment is not needed, and large-amplitude shaking is avoided after installation.

Description

Technical Field

[0001] The utility model relates to the technical field of nuclear power plant maintenance, in particular to a foreign matter blocking prevention plate suitable for the primary side of a steam generator of a nuclear power plant. Background Art

[0002] During the shutdown and overhaul of a nuclear power plant, the steam generator needs to be overhauled. The maintenance items related to the primary side of the steam generator must be carried out in the water chamber of the steam generator. In order to prevent personnel or equipment from falling into the main pipeline during maintenance work inside the steam generator and to prevent accidents from happening, the primary side of the steam generator must be used to block the primary circuit pipeline holes of the steam generator with a foreign body blocking plate.

[0003] The installation and disassembly of the anti-foreign matter plugging plate on the primary side of the steam generator is one of the tasks with the highest radiation dose during the overhaul. At present, the split-type products of the foreign manufacturer SCIENTECH are used. The plugging personnel need to complete the assembly of three independent plugging plates in the water chamber of the steam generator and tighten the fixing bolts. The radiation dose in the water chamber is high, and the implementation personnel need to wear gas suits to operate. At the same time, the inner surface is hemispherical and slippery, which is not conducive to standing and operating. The personnel must complete the disassembly and assembly within the required time for radiation protection. During the operation, if the implementation personnel's work limit time has expired and the work has not been completed, the personnel must be replaced immediately to complete the subsequent work. The total time for the disassembly and assembly of the anti-foreign matter plugging plates on the cold end and hot end of the primary side of a steam generator is about 3 to 5 minutes, and the total dose is 600-1000μmSA / unit. Utility Model Content

[0004] The utility model aims to provide an anti-foreign matter blocking plate suitable for the primary side of a steam generator in a nuclear power plant, which solves the problems of heavy weight, difficult operation, long time consumption and high risk of the anti-foreign matter blocking plate on the primary side of an old type of steam generator.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A foreign body blocking prevention plate suitable for the primary side of a steam generator in a nuclear power plant comprises a first side panel, a first main panel, a second main panel and a second side panel which are sequentially connected into a circle, wherein the first side panel and the first main panel, the first main panel and the second main panel, and the second main panel and the second side panel are all connected via hinges; positioning blocks are provided on the backs of the first main panel and the second main panel, and positioning arcs are provided on the backs of the first side panel and the second side panel.

[0007] As an implementable manner, the first side panel and the second side panel are symmetrically arranged and have the same structure, and the first main panel and the second main panel are symmetrically arranged and have the same structure.

[0008] As an implementable manner, both the first main panel and the second main panel are provided with handles.

[0009] As an implementable manner, the two handles have the same structure and are symmetrically arranged.

[0010] As an implementable manner, two positioning blocks are provided on the first main panel and are respectively arranged on the outer sides of the first main panel.

[0011] As an implementable manner, two positioning blocks are provided on the second main panel and are respectively arranged on the outer sides of the second main panel.

[0012] As an implementable manner, the two positioning arcs are arranged symmetrically.

[0013] As an implementable manner, the positioning block is fixed by a second hexagon socket head screw, and the positioning arc is fixed by a first hexagon socket head screw.

[0014] As an implementable manner, the anti-foreign object rope is arranged on the second main panel.

[0015] As an implementable manner, the material used for the anti-foreign matter blocking plate is aluminum alloy.

[0016] Compared with the prior art, the foreign body blocking plate for the primary side of a steam generator in a nuclear power plant provided by the utility model has the following beneficial effects:

[0017] The utility model realizes that the new type of anti-foreign object blocking plate can be folded and entered into the steam generator water chamber as a whole through the manhole on the primary side of the steam generator. A single person can easily open it as a whole in the water chamber and directly put it on the main pipe mouth to complete the installation. There is no jamming and no adjustment during installation. There is no large shaking after installation. It can also be disassembled by a single person. It can be easily folded by picking it up from the main pipe mouth, and there is no jamming during disassembly.

[0018] The utility model achieves the technical effect of reducing the installation time of a single set of plugging plates to ≤40S and the disassembly time to ≤40S by redesigning the technical means of the plugging plate installation process, shortening the working time of personnel in the water chamber by 50% to 60%, greatly reducing the radiation dose, and greatly reducing the risk of falling during the installation of the anti-foreign object plugging plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solution of the present utility model, the drawings required for the technical description are briefly introduced below.

[0020] Figure 1 A front view of a foreign body blocking plate for the primary side of a steam generator in a nuclear power plant provided by the utility model;

[0021] Figure 2 for Figure 1 Sectional view along section AA;

[0022] Figure 3 for Figure 2 The enlarged view of point B in the middle;

[0023] Figure 4 A schematic diagram of the back side of the foreign matter blocking plate for preventing foreign matter from blocking the primary side of a steam generator in a nuclear power plant provided by the utility model;

[0024] Figure 5 The utility model is a schematic diagram of a folding anti-foreign matter blocking plate on the primary side of a nuclear power plant steam generator.

[0025] Description of reference numerals:

[0026] 1. Handle; 2. Hexagon socket countersunk screw; 3. Hinge; 4. Side panel; 5. Main panel; 6. Positioning block; 7. Positioning arc; 8. First hexagon socket cylindrical head screw; 9. Second hexagon socket cylindrical head screw; 10. Anti-foreign object rope. DETAILED DESCRIPTION

[0027] The following is further explained in detail through specific implementation methods.

[0028] like Figures 1 to 4 As shown, the utility model provides an anti-foreign matter blocking plate suitable for the primary side of a steam generator in a nuclear power plant, comprising a first side panel 4, a first main panel 5, a second main panel 51, and a second side panel 41 connected in sequence to form a circle, the anti-foreign matter blocking plate is circular as a whole and bilaterally symmetrical, the first side panel 4 and the second side panel 41 are symmetrically arranged and have the same structure, the first main panel 5 and the second main panel 51 are symmetrically arranged and have the same structure. The first side panel 4 and the first main panel 5 are connected by a hinge 3, the first main panel 5 and the second main panel 51 are connected by a hinge 3, and the second main panel 51 and the second side panel 41 are connected by a hinge 3.

[0029] The first main panel 5 and the second main panel 51 are both provided with handles 1, and the two handles 1 are symmetrically arranged. The hinge 3 connecting the first main panel 5 and the second main panel 51 is fixedly mounted on the first main panel 5 and the second main panel 51 by means of hexagon socket countersunk screws 2.

[0030] The back of the first main panel 5 and the second main panel 51 are both provided with positioning blocks 6, and the function of the positioning blocks 6 is to prevent the anti-foreign object blocking plate from sliding after installation. Two positioning blocks 6 are provided on each main panel, and the two positioning blocks 6 are respectively arranged on the outside of the main panel. The back of the first side panel 4 and the second side panel 41 are both provided with positioning arcs 7, and the function of the positioning arcs 7 is to prevent the anti-foreign object blocking plate from sliding after installation. The two positioning arcs 7 are arranged symmetrically, and the positioning arcs 7 are arranged near the outer circle of the anti-foreign object blocking plate. The two positioning blocks 6 and the two positioning arcs 7 are arranged on the circular ring on the back of the anti-foreign object blocking plate.

[0031] The positioning block 6 is fixed by a second hexagon socket head screw 9 , and the positioning arc 7 is fixed by a first hexagon socket head screw 8 .

[0032] Preferably, the anti-foreign-object rope 10 is arranged on the handle 1 of the second main panel 51, and can be disassembled and replaced on other panel handles according to needs. Its function is to prevent the anti-foreign-object blocking plate from falling.

[0033] The foreign body blocking plate adopts an integral folding structure. The operator folds the foreign body blocking plate and then enters the steam generator water chamber through the primary side manhole of the steam generator (such as Figure 5 As shown), then unfold the anti-foreign matter plugging plate and place it above the steam generator main pipeline sealing ring seat pipe opening according to the required placement direction, and finally stably cover the steam generator main pipeline sealing ring seat pipe opening. Similarly, the reverse operation can realize the removal of the plugging plate. At the same time, the plugging plate must meet the requirements of impact resistance and load-bearing performance.

[0034] The anti-foreign-object plugging plate is of integral folding type and can seal the primary-loop pipe holes of the steam generator, thus providing prerequisites for the commissioning and inspection of the steam generator.

[0035] The anti-foreign-object plug adopts a foldable structure. The folding panel is connected by a precise hinge mechanism. It can be easily unfolded and folded, and meets the requirements of miniaturization and lightweight design. The operation is simple and light, and the operator does not need to perform splicing operations. At the same time, a handle, a ring seat pipe mouth positioning guide device, etc. are set. The plug meets the requirements of impact resistance and load-bearing performance: no damage occurs when the falling object has a drop height of 1.5m and a weight of 18kg; no damage occurs when it bears a static load of 100kg. The surface of the plug is smooth and easy to clean, and there are no sharp parts on each edge, which will not cause mechanical damage to the operator. When the plug falls on the main pipeline liner ring seat, the guide positioning arc under the panel enables the plug to effectively cover the liner ring seat, avoiding dislocation and sliding along the inclined surface, causing the plug to cover ineffectively and preventing sliding and detachment.

[0036] Furthermore, the material of the anti-foreign matter blocking plate is selected from materials with high strength and rigidity, good toughness, mature, safe and reliable materials. The appropriate material is finally selected through structural modeling and simulation analysis of Mg-Al alloy, ZK series magnesium alloy, aluminum alloy materials, etc. After analysis, aluminum alloy (honeycomb sandwich aluminum plate) is used.

[0037] The foreign body blocking plate adopts simulation analysis: professional geometric modeling tool software is used to establish a parametric three-dimensional geometric solid model of the main components of the blocking plate, and the object and model analysis is performed on the structural prototype of the blocking plate. At the same time, finite element analysis software is used to perform mechanical analysis calculation and simulation to verify that its key technical indicators such as bearing capacity meet the requirements.

[0038] The impact resistance of the anti-foreign object plugging plate is verified: the impact resistance of the anti-foreign object plugging plate on the primary side of the steam generator is verified through experiments, and the plugging plate is required to meet the following requirements for impact resistance: when the falling object has a drop height of 1.5m and a weight of 18kg, no damage will occur and only slight deformation will occur.

[0039] Simulation drill on anti-foreign object blocking plate: Disassembly and assembly drill is carried out on the steam generator simulation body, and it is confirmed that one person can easily open the whole plate in the water chamber, and the installation can be completed by directly placing it on the main pipe mouth. There is no jamming and no adjustment during installation, and there is no large shaking after installation. The operation can also be completed by one person during disassembly. It can be easily folded by picking it up from the main pipe mouth. There is no jamming during disassembly. The installation time of a single set of blocking plates is ≤40S, and the disassembly time is ≤40S.

[0040] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the utility model should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model shall be based on the protection scope of the claims.

Claims

1. A foreign body blocking plate suitable for the primary side of a steam generator in a nuclear power plant. It is characterized in that The invention comprises a first side panel (4), a first main panel (5), a second main panel (51), and a second side panel (41) which are sequentially connected to form a circle; the first side panel (4) and the first main panel (5), the first main panel (5) and the second main panel (51), and the second main panel (51) and the second side panel (41) are all connected via hinges (3); the backs of the first main panel (5) and the second main panel (51) are both provided with positioning blocks (6), and the backs of the first side panel (4) and the second side panel (41) are both provided with positioning arcs (7).

2. The foreign body blocking plate for the primary side of a steam generator in a nuclear power plant according to claim 1, It is characterized in that The first side panel (4) and the second side panel (41) are symmetrically arranged and have the same structure, and the first main panel (5) and the second main panel (51) are symmetrically arranged and have the same structure.

3. The foreign body blocking prevention plate for the primary side of a steam generator in a nuclear power plant according to claim 1, It is characterized in that The first main panel (5) and the second main panel (51) are both provided with handles (1).

4. The foreign body blocking prevention plate for the primary side of a steam generator in a nuclear power plant according to claim 3, It is characterized in that The two handles (1) have the same structure and are symmetrically arranged.

5. The foreign body blocking prevention plate for the primary side of a steam generator in a nuclear power plant according to claim 1, It is characterized in that The first main panel (5) is provided with two positioning blocks (6), which are respectively arranged on the outer sides of the first main panel (5).

6. The foreign body blocking plate for the primary side of a steam generator in a nuclear power plant according to claim 1, It is characterized in that The second main panel (51) is provided with two positioning blocks (6), which are respectively arranged on the outer sides of the second main panel (51).

7. The foreign body blocking prevention plate for the primary side of a steam generator in a nuclear power plant according to claim 1, It is characterized in that The two positioning arcs (7) are arranged symmetrically.

8. The foreign body blocking prevention plate for the primary side of a steam generator in a nuclear power plant according to claim 1, It is characterized in that The positioning block (6) is fixed by a second hexagon socket head screw (9), and the positioning arc (7) is fixed by a first hexagon socket head screw (8).

9. The foreign matter blocking prevention plate for the primary side of a steam generator in a nuclear power plant according to claim 1, It is characterized in that The foreign body prevention rope (10) is arranged on the second main panel (51).

10. The foreign matter blocking prevention plate for the primary side of a steam generator in a nuclear power plant according to claim 1, It is characterized in that The material adopted by the anti-foreign matter blocking plate is aluminum alloy.

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