Main control room can reside area boundary into a bundle of cable sealing performance test device

Abstract

This invention relates to a testing device for the sealing performance of bundled cables at the boundary of the habitable area in a main control room. The device comprises a testing component, a detection component, a pressurizing component, a connecting component, and a sealing component. Cables are threaded through the testing component. The detection component is mounted on the testing component to detect the pressure within it. The pressurizing component is connected to the test chamber via the connecting component to pressurize the testing component. The sealing component is disposed within the testing component to seal the gaps where the cables pass through it. Therefore, this device can detect deficiencies in current cable sealing processes in nuclear power plants and identify potential leakage points. Furthermore, by using the device of this embodiment, multiple comparative tests can be conducted to determine the appropriate type of sealing material to be used to seal the gaps where cables pass through the holes.

Description

Technical Field

[0001] This invention relates to the fields of sealing cable holes in nuclear island areas and pressure gradient testing of ventilation systems, and particularly to a device for testing the sealing performance of bundled cables at the boundary of the habitable area of ​​the main control room. Background Technology

[0002] During the negative / positive pressure gradient tests of the nuclear island building, it was discovered that leaks of varying degrees occurred in the sealed openings, affecting the establishment of positive / negative pressure in the building. The most severe leaks generally occurred in electrical and instrumentation openings where bundles of cables passed through. These openings are commonly found in areas with numerous control and power cables passing through, such as the containment corridor, safety building, nuclear auxiliary building, fuel building, and main control room. Because these openings cannot be pressure tested independently, troubleshooting them requires a significant investment of time, manpower, and resources.

[0003] In order to ensure the sealing of such holes during the construction of the plant boundary, and to reduce the difficulty of leak detection during the later pressure gradient test of the nuclear island plant and the leak test of the main control room, it is necessary to conduct quantitative tests on the existing process of sealing bundled cables before sealing the holes on site. This will verify whether the leakage rate of the holes sealed by the current sealing process meets the requirements of the pressure gradient test, and optimize the points where leaks may occur in advance.

[0004] Currently, the effectiveness of sealing bundled cable holes in nuclear power plants is mainly assessed through overall plant pressure tests, such as the CTT (Containment Performance Test) of the reactor building, the OCTT (Organic Circular Test) of the reactor annulus, and pressure gradient tests of various nuclear auxiliary and safety buildings. These tests apply high pressure to the existing sealed boundary to identify leaks, which are then addressed one by one. However, for buildings or areas where overall pressure testing is not feasible, such as the main control room area and surrounding buildings, the effectiveness of boundary sealing cannot be verified using this type of pressure test.

[0005] Furthermore, regarding the verification methods for the sealing performance of plugging materials for bundled cables, plugging material manufacturers mainly use the water displacement bubble method for airtightness testing on single pipes, solely to verify the sealing performance of the sealing material itself. However, for bundled cables that penetrate various sizes and types of cables, quantitative assessment of leakage is not possible.

[0006] To ensure that the boundary sealing performance meets the design requirements, it is necessary to evaluate the sealing performance of the sealing method for holes through which many cables pass. Summary of the Invention

[0007] The technical problem to be solved by the present invention is to provide a test device for the sealing performance of bundled cables at the boundary of the habitable area of ​​the main control room.

[0008] The technical solution adopted by the present invention to solve its technical problem is: a test device for sealing performance of bundled cables at the boundary of the habitable area of ​​the main control room, comprising a test component, a detection component, a pressurization component, a connection component and a sealing component, wherein the cable is threaded through the test component;

[0009] The detection component is mounted on the test component to detect the pressure inside the test component;

[0010] The pressurizing component is connected to the experimental chamber via the connecting component to pressurize the experimental component;

[0011] The sealing component is disposed within the test assembly to seal the gaps in the holes through which the cable passes through the test assembly.

[0012] In some embodiments, the test assembly includes a blocking area and an inflation area, the blocking area being disposed on both sides of the inflation area, and a blocking assembly being provided between the blocking area and the inflation area.

[0013] In some embodiments, the inflation zone is provided with an inflation port for the connection assembly to connect to, so that the pressurizing assembly pressurizes the inflation zone.

[0014] In some embodiments, the detection component includes a pressure gauge connected to the inflation zone to detect the pressure in the inflation zone.

[0015] In some embodiments, the pressurization assembly includes an air compressor to pressurize the test assembly.

[0016] In some embodiments, the pressure gauge is electrically connected to the air compressor to control the air compressor to stop operating when the pressure gauge detects that a set pressure value has been reached in the inflation zone.

[0017] In some embodiments, the connection assembly includes a hose for connecting the pressurization assembly and the test assembly.

[0018] In some embodiments, the connection assembly further includes an isolation valve disposed on the hose.

[0019] In some embodiments, the air compressor is electrically connected to the isolation valve to control the isolation valve to close when the pressure gauge detects that a set pressure value has been reached in the inflation zone.

[0020] In some embodiments, the sealing assembly includes a sealing grid disposed between the inflation zone and the sealing zone to separate the inflation zone and the sealing zone.

[0021] In some embodiments, the sealing assembly further includes a sealing material that fills the gaps in which the cable passes through the test assembly to seal the test assembly.

[0022] The implementation of this invention has the following beneficial effects: the device of this embodiment can detect the deficiencies in the current process of sealing the holes of bundled cables in nuclear power plants and the leakage points that are prone to occur. At the same time, by using the device of this embodiment, multiple tests can be conducted to determine the type of sealing material to be used to seal the gaps when the cable passes through the hole.

[0023] Based on the results of multiple sealing performance tests using silicones of different densities, it was concluded that to meet the airtightness requirements for hole sealing, sealing materials of equal to or higher density than medium-density silicone must be used. Furthermore, the test results provided solutions for improving the sealing material's ability to enclose cables. For example, for cable tray holes containing bundled cables, once the location of a leak in the tray is identified, that leak point can be treated with sealing material, and the sealing effect can be re-verified according to the aforementioned test method to ensure the final leakage rate meets requirements. Therefore, the optimized sealing process derived from the test apparatus of this invention is widely used throughout the nuclear island area, especially in locations with high leakage rate requirements.

[0024] By conducting a pressure decay test on the test device of the present invention, the overall leakage curve of the bundled cable holes under medium-density silicone sealing was obtained, and the maximum leakage of a single hole was calculated, providing data support for subsequent leakage test evaluation of the leakage in the main control room.

[0025] Based on the current boundary sealing effect, the sealing effect of the bundled cable holes optimized by this test device is quite ideal, and positive pressure is relatively easy to establish within the boundary of the main control room. Attached Figure Description

[0026] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the accompanying drawings:

[0027] Figure 1 This is a schematic diagram of the structure of the test device for sealing performance of bundled cables at the boundary of the habitable area of ​​the main control room in an embodiment of the present invention. Detailed Implementation

[0028] To provide a clearer understanding of the technical features, objectives, and effects of the present invention, specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0029] Figure 1 This invention illustrates a test apparatus for sealing performance of bundled cables at the boundary of the habitable area of ​​the main control room, according to some embodiments of the present invention. This apparatus can be used to verify the integrity and sealing performance of the nuclear island pressure boundary. It may include a test component 1, a detection component 2, a pressurization component 3, a connection component 4, and a sealing component 5. Cables are threaded through the test component 1. Because for buildings or areas where overall pressure testing is not possible, such as the main control room area and surrounding buildings, the sealing effect of the boundary cannot be verified using overall pressure testing. Simultaneously, it is necessary to quantitatively assess the gas leakage rate of the bundled cables, which penetrate various sizes and types of cables, and to optimize existing hole sealing processes based on the test results, so that the leakage rate of the sealed bundled cable holes can meet the design sealing performance requirements. The test apparatus of the present invention can meet this requirement.

[0030] The detection component 2 is installed on the test component 1 to detect the pressure inside the test component 1. By detecting the change in the pressure value inside the test component 1 over a period of time, and then calculating the amount of gas leakage during this period based on the volume of the test component 1, the sealing performance of the test component 1 can be analyzed. If the leakage is greater within the same time and volume, the sealing performance is worse. The pressurization component 3 is connected to the test component 1 through the connecting component 4. The pressurization component 3 is used to pressurize the test component 1, and the connecting component 4 is used to transport the gas generated by the pressurization component 3 into the test component 1.

[0031] Specifically, the pressurizing component 3 increases the pressure inside the test component 1 by inflating it with air. The sealing performance of the test component 1 is verified by the change in pressure inside the test component 1 over a period of time. The connecting component 4 is used to transfer the gas generated by the pressurizing component 3 to the test component 1. At this time, one end of the connecting component 4 is connected to the pressurizing component 3 and the other end is connected to the test component 1. The pressurizing component 3 starts to inflate during operation, and the gas flows into the test component 1 through the connecting component 4, gradually increasing the pressure inside the test component 1.

[0032] When the pressure inside the test assembly 1 reaches the requirement for a sealing test, the pressurizing assembly 3 stops pressurizing the test assembly 1. The sealing assembly 5 is installed inside the test assembly 1 to seal the gaps that occur on the test assembly 1 when the cable passes through the test chamber. When the cable passes through the test assembly 1, the cable and the hole on the test assembly 1 for the cable to pass through are not completely fitted together, and there is a certain gap. Therefore, the sealing assembly 5 is needed to seal it to ensure the sealing performance of the test assembly 1. At the same time, the sealing effect of the sealing assembly 5 can also be evaluated. The better the sealing effect of the sealing assembly 5, the better the sealing performance of the test assembly 1.

[0033] Therefore, the device in this embodiment can detect the deficiencies in the current process of sealing the holes of bundled cables in nuclear power plants and the leakage points that are prone to occur. At the same time, it can also conduct multiple tests and comparisons using the device in this embodiment to determine the type of sealing material to be used to seal the gaps when the cable passes through the hole.

[0034] In some embodiments, test assembly 1 includes a blocking area 11 and an inflation area 12, meaning that the test assembly is divided into a blocking area 11 and an inflation area 12. The blocking area 11 is located on both sides of the inflation area 12, and a blocking assembly 5 is provided between the blocking area 11 and the inflation area 12. Specifically, the blocking assembly 5 includes a sealing grid 51 and a sealing material. The sealing grid 51 is located between the blocking area 11 and the inflation area 12 to separate the blocking area 11 and the inflation area 12, ensuring the smooth progress of the blocking and sealing performance test.

[0035] Meanwhile, the cable passes through the first sealing area 11, the inflation area 12 and the second sealing area 11 in sequence, and through the boundary between the sealing area 11 and the outside world and the sealing grid 51 between the sealing area 11 and the inflation area 12. The holes on the boundary and the sealing grid 51 for the cable to pass through are not completely fitted with the cable, and there are gaps between them. Therefore, sealing material is needed to seal these gaps to ensure the airtightness of the test component 1.

[0036] Furthermore, in this embodiment, the sealing material is silicone, which is divided into low-density silicone and medium-density silicone. These two types of silicone are used to seal the gap between the hole and the cable to verify the sealing effect of the two types of silicone. In addition, in order to accurately determine the specific location of the gas leak point, the sealing area 11 is also filled with liquid. During the sealing performance test, if there is a place that is not completely sealed, i.e., a possible gas leak point, the liquid will flow to the leak point under pressure and then seep out of the test component 1. At this time, the specific seepage of the liquid can be used to determine whether there is a leak in the test component. At the same time, the specific leak point that causes the pressure drop in the test component 1 can be found. Subsequently, the sealing of the leak point can be strengthened to improve the sealing performance of the test component 1, reduce the amount of gas leakage, and finally achieve the overall leakage effect of no leakage under 30Pa pressure, i.e., the pressure value in the test component is stable at 30Pa.

[0037] Furthermore, in some embodiments, the inflation zone 12 is provided with an inflation port 121, which is used for connection of the connecting component 4. When the connecting component 4 is connected to both the inflation port 121 and the pressurizing component 3, the gas generated by the pressurizing component 3 can enter the inflation zone 12 through the connecting component 4 and the inflation port 121, thereby increasing the pressure in the inflation zone 12. In this embodiment, the pressure in the inflation zone 12 needs to be increased to 950 Pa. Under this pressure condition, the sealing performance test is carried out. Therefore, the pressurizing component 3 needs to continuously pressurize the inflation zone 12 to make the pressure in the inflation zone 12 reach 950 Pa before the sealing performance test is carried out.

[0038] In some embodiments, the detection component 2 includes a pressure gauge 21 connected to the inflation zone 12 for detecting the pressure in the inflation zone 12. By detecting the pressure change over a period of time, the amount of leaked gas is calculated to determine the sealing performance of the test component 1. The less the amount of leaked gas, the better the sealing performance of the test component 1. In this embodiment, the pressure gauge 21 is a high-precision digital pressure gauge 21 to more accurately measure the pressure change value in the inflation zone 12.

[0039] Specifically, based on the relationship between gas volume and pressure under standard conditions, the amount of gas leaking through the seal per unit time can be calculated by measuring the pressure drop within the inflation zone 12 over a certain period of time. The specific calculation process is shown in the following formula:

[0040] Q = Ve × (ΔP / 1.013 × 10) 5 )×(60 / T)

[0041] Q - Leakage rate per unit time (mL / (min*Pa))

[0042] Ve - Compressed air inflation zone 12 mL

[0043] ΔP - Change in unit applied internal pressure (Pa)

[0044] T-detection time (min)

[0045] In some embodiments, the pressurization assembly 3 includes an air compressor 31 for pressurizing the test assembly 1 and increasing the pressure within the test assembly 1. Specifically, the air compressor 31 is connected to the inflation zone 12 via a connecting assembly 4. The air compressor 31 then operates and generates gas, which flows through the connecting assembly 4 and the inflation port 121 and into the inflation zone 12. This inflates the inflation zone 12. In this embodiment, when the pressure gauge 21 detects a pressure value of 950 Pa in the inflation zone 12, the air compressor 31 stops operating, at which point the inflation of the inflation zone 12 is complete.

[0046] Furthermore, pressure gauge 21 is electrically connected to air compressor 31. When pressure gauge 21 detects that the set pressure value has been reached in the inflation zone 12, pressure gauge 21 sends a signal to air compressor 31 to control air compressor 31 to stop operating, so that the inflation zone 12 reaches a stable pressure value, thereby ensuring the accuracy of the sealing performance test and ensuring that the sealing performance of two silicones with different densities can be accurately judged.

[0047] In some embodiments, the connecting component 4 includes a hose 41 for connecting the pressurizing component 3 and the test component 1. Specifically, one end of the hose 41 is connected to the inflation port 121, and the other end is connected to the air compressor 31, so that gas can flow from the air compressor 31 to the inflation zone 12, increasing the pressure in the inflation zone 12 for sealing performance testing. At the same time, using the hose 41 to connect the inflation zone 12 and the air compressor 31 also allows for more flexible adjustment of the placement of the air compressor 31. Due to the material properties of the hose 41, it can be bent, compressed, and extended to a certain extent. There is no need to worry about whether the placement of the air compressor 31 will affect the hose 41, thus making the test more convenient and eliminating concerns about equipment placement.

[0048] Furthermore, in some embodiments, the connecting component 4 also includes an isolation valve 42, which is disposed on the hose 41 to separate the inflation zone 12 from the air compressor 31. That is, when the air compressor 31 finishes inflation and the pressure value of the inflation zone 12 reaches the experimental requirements, the air compressor 31 stops operating. If the inflation zone 12 and the air compressor 31 are not separated, the gas in the inflation zone 12 may flow back into the air compressor 31, causing the pressure in the inflation zone 12 to drop and affecting the accuracy of the sealing performance test.

[0049] Therefore, in order to prevent the gas in the inflation zone 12 from flowing back and causing a drop in pressure in the inflation zone 12, an isolation valve 42 is installed on the hose 41 connecting the inflation zone 12 and the air compressor 31. When inflation is performed, the isolation valve 42 is opened to allow gas to flow from the air compressor 31 to the inflation zone 12. After inflation is completed, the isolation valve 42 is closed to prevent the gas in the inflation zone 12 from flowing back into the air compressor 31.

[0050] At the same time, the air compressor 31 is electrically connected to the isolation valve 42 so that when the pressure gauge 21 detects that the set pressure value has been reached in the inflation zone 12, the pressure gauge 21 sends a signal to the isolation valve 42 to control the isolation valve 42 to close, so as to prevent the gas in the inflation zone 12 from flowing back to the air compressor 31.

[0051] When using this device to conduct a sealing performance test, first use low-density silicone to seal the gap formed when the cable passes through the test chamber. Then, turn on the air compressor 31 and open the isolation valve 42 to allow the air compressor 31 to inflate the inflation zone 12. When the pressure gauge 21 detects a pressure value of 950 Pa in the inflation zone 12, the air compressor 31 stops operating. At this time, close the isolation valve 42, wait for a period of time, and then read the value of the pressure gauge 21 again to calculate the amount of leaked air.

[0052] Then, medium-density silicone was used to seal the gap formed when the cable passed through test component 1. The subsequent steps were repeated to obtain the amount of air leaked. The values ​​of the amount of air leaked in the two tests were compared to determine the sealing performance of the two sealing materials.

[0053] Understandably, the above-mentioned technical features can be used in any combination without restriction.

[0054] The above are merely embodiments of the present invention and do not limit the scope of the patent. Any equivalent structural or procedural transformations made based on the description and drawings of the present invention, or direct or indirect applications in other related technical fields, are similarly included within the scope of patent protection of the present invention.

Claims

1. A test device for the sealing performance of bundled cables at the boundary of the habitable area in a main control room, characterized in that, It includes a test assembly (1), a detection assembly (2), a pressurization assembly (3), a connection assembly (4) and a sealing assembly (5), with the cable passing through the test assembly (1); The test component (1) includes a blocking area (11) and an inflation area (12). The blocking area (11) is located on both sides of the inflation area (12), and the blocking component (5) is provided between the blocking area (11) and the inflation area (12). The detection component (2) is installed on the test component (1) to detect the pressure inside the test component (1); wherein, by detecting the change in the pressure value inside the test component (1) over a period of time, the amount of gas leakage during this period is calculated based on the volume of the test component (1), thereby analyzing the sealing performance of the test component (1); The pressurizing component (3) is connected to the test component (1) via the connecting component (4) to pressurize the test component (1); The sealing component (5) is disposed within the test component (1) to seal the gaps in the holes through which the cable passes through the test component (1); the sealing component (5) includes a sealing grid (51) and a sealing material, the sealing grid (51) being disposed between the inflation zone (12) and the sealing zone (11) to separate the inflation zone (12) and the sealing zone (11), and the sealing material filling the gaps in which the cable passes through the test component (1) to seal the test component (1).

2. The test device for sealing performance of bundled cables at the boundary of the habitable area of ​​the main control room according to claim 1, characterized in that, The inflation zone (12) is provided with an inflation port (121) for the connection component (4) to be connected, so that the pressurizing component (3) pressurizes the inflation zone (12).

3. The test device for sealing performance of bundled cables at the boundary of the habitable area of ​​the main control room according to claim 1, characterized in that, The detection component (2) includes a pressure gauge (21) connected to the inflation zone (12) to detect the pressure of the inflation zone (12).

4. The test device for sealing performance of bundled cables at the boundary of the habitable area of ​​the main control room according to claim 3, characterized in that, The pressurization assembly (3) includes an air compressor (31) for pressurizing the test assembly (1).

5. The test device for sealing performance of bundled cables at the boundary of the habitable area of ​​the main control room according to claim 4, characterized in that, The pressure gauge (21) is electrically connected to the air compressor (31) so that when the pressure gauge (21) detects that the set pressure value has been reached in the inflation zone (12), the air compressor (31) is controlled to stop operating.

6. The test device for sealing performance of bundled cables at the boundary of the habitable area of ​​the main control room according to claim 4, characterized in that, The connection assembly (4) includes a hose (41) for connecting the pressurization assembly (3) and the test assembly (1).

7. The test device for sealing performance of bundled cables at the boundary of the habitable area of ​​the main control room according to claim 6, characterized in that, The connection assembly (4) also includes an isolation valve (42) disposed on the hose (41).

8. The test device for sealing performance of bundled cables at the boundary of the habitable area of ​​the main control room according to claim 7, characterized in that, The air compressor (31) is electrically connected to the isolation valve (42) so as to control the isolation valve (42) to close when the pressure gauge (21) detects that the set pressure value has been reached in the inflation zone (12).

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