Device for verifying sealing performance of containment spray device

Abstract

The utility model relates to a device for verifying the sealing performance of a containment spray device. The device comprises a first verification unit and a second verification unit. The first verification unit is connected to the water pipe between the first valve and the second valve, and the second verification unit is connected to the water pipe between the second valve and the water injection device. The working principle of the device is that when the first verification unit is opened, whether liquid flows out or not can be observed so as to judge whether the first valve is tightly closed or not. The second verification unit comprises a hose, so that when the water injection pipeline between the first valve and the second valve is filled with non-radioactive liquid and the second verification unit is opened, whether non-radioactive water flows out of the second verification unit or not can be observed, and the sealing performance of the second valve is verified. According to the method, the safety of the test is improved, the cleaning and treatment work after the test is simplified, and the generation of extra radioactive wastewater is reduced.

Description

Technical Field

[0001] The utility model relates to the field of nuclear power, in particular to a device for verifying the sealing performance of a containment shell spray device. Background Art

[0002] During the CPR1000 unit overhaul, the T*EAS002 and T*RIS005 tests verified the operability of two manual isolation valves (valve 1 and valve 2) for the temporary primary spray and temporary primary water injection functions associated with the PF improvement project. Each test cycle lasted 1C (one cycle). Because the isolation valves being verified were connected downstream to the PTR001BA (refueling water tank), the original test method allowed radioactive boron water to enter between the two isolation valves during valve opening and closing, often leading to radioactive hotspot accumulation after the tests. The injection pipeline was connected to the refueling water tank, with the first and second valves installed on the injection pipeline. After a T4EAS002 test, the exposure dose rate in the pipeline containing isolation valve 4EAS950VB (valve 2) exceeded the standard, resulting in an internal operational event. This required the establishment of a temporary control area during the test, and multiple, time-consuming flushing operations were required after the test to reduce the exposure dose rate in the pipeline. The flushing water, after passing through the isolation valves outside the control area, required special collection, generating additional radioactive wastewater. Utility Model Content

[0003] The utility model provides a device for verifying the sealing performance of a containment shell spray device, which solves the problem of verifying the sealing performance between a first valve and a second valve.

[0004] In order to solve the above technical problems, the utility model provides a device for verifying the sealing performance of a containment spray device, wherein the spray device comprises a refueling water tank 10, a water injection pipe 11, a first valve 12, a second valve 13 and a water injection device 14;

[0005] The water injection pipe 11 passes through the wall 15 and is connected to the refueling water tank 10 and the water injection device 14 respectively. The first valve 12 is provided on the water injection pipe 11 between the wall 15 and the refueling water tank 10. The second valve 13 is provided on the water injection pipe 11 between the wall 15 and the water injection device 14. The device for verifying the sealing performance of the containment spray device includes a first verification unit 16 and a second verification unit 17.

[0006] The first verification unit 16 is connected to the water injection pipe 11 between the first valve 12 and the second valve 13 , and the second verification unit 17 is connected to the water injection pipe 11 between the second valve 13 and the water injection device 14 ;

[0007] Open the first verification unit 16 and observe whether liquid flows out of the first verification unit 16 to verify the sealing of the first valve 12;

[0008] The first verification unit includes a hose 161. When the water injection pipe 11 between the first valve 12 and the second valve 13 is filled with non-radioactive water through the hose 161, the second verification unit 17 is opened to observe whether radioactive water flows out of the second verification unit 17 to verify the sealing of the second valve 13.

[0009] In one embodiment, the first verification unit 16 further includes a first verification valve 162 and a first pipeline 163;

[0010] One end of the first pipe 163 is connected to the water injection pipe 11 between the first valve 12 and the second valve 13 , and the other end is connected to the hose 161 . The first verification valve 162 is provided on the first pipe 163 .

[0011] Opening the first verification unit 16 and observing whether liquid flows out of the first verification unit 16 to verify the sealing performance of the first valve 12 includes:

[0012] The sealing performance of the first valve 12 is verified by opening the first verification valve 162 and observing whether liquid flows out of the first pipe 163 .

[0013] In one embodiment, the second verification unit 17 includes a second verification valve 171 and a second pipeline 172;

[0014] The second pipe 172 is connected to the water injection pipe 11 between the second valve 13 and the water injection device 14 , and the second verification valve 171 is provided on the second pipe 172 ;

[0015] Opening the second verification unit 17 and observing whether radioactive water flows out of the second verification unit 17 to verify the sealing performance of the second valve 13 includes:

[0016] The second verification valve 171 is opened to observe whether radioactive water flows out of the second pipe 172 to verify the sealing performance of the second valve 13 .

[0017] In one embodiment, the device for verifying the sealing performance of the spray device further comprises an exhaust unit 18;

[0018] The exhaust unit 18 is connected to the water injection pipe 11 between the wall 15 and the first verification unit 16;

[0019] The exhaust unit 18 makes the water injection pipe 11 between the first valve 12 and the second valve 13 free of gas and filled with non-radioactive water.

[0020] In one embodiment, the exhaust unit 18 includes an exhaust valve 181 and a third pipe 182;

[0021] The third pipe 182 is connected to the water injection pipe 11 between the wall 15 and the first verification unit 16 , and the exhaust valve 181 is provided on the third pipe 182 ;

[0022] The water injection pipe 11 between the first valve 12 and the second valve 13 is made gas-free and filled with non-radioactive water by the exhaust unit 18 , which includes:

[0023] The exhaust valve 181 allows the water injection pipe 11 between the first valve 12 and the second valve 13 to be free of gas and filled with non-radioactive water.

[0024] In one embodiment, the device for verifying the sealing performance of the spray device further includes a drainage unit 19;

[0025] The drainage unit 19 is connected to the water injection pipe 11 between the wall 15 and the second valve 13;

[0026] After verifying the sealing of the second valve 13 , the gas in the water injection pipe 11 between the first valve 12 and the second valve 13 is discharged through the exhaust valve 181 , and the radioactive-free water in the water injection pipe 11 between the first valve 12 and the second valve 13 is discharged through the drainage unit 19 .

[0027] In one embodiment, the drainage unit 19 includes a drainage valve 191 and a fourth pipe 192;

[0028] The fourth pipe 192 is connected to the water injection pipe 11 between the wall 15 and the second valve 13;

[0029] The step of draining the non-radioactive water in the water injection pipe 11 between the first valve 12 and the second valve 13 through the drainage unit 19 includes:

[0030] The non-radioactive water in the water injection pipe 11 between the first valve 12 and the second valve 13 is then discharged through the drainage valve 191 .

[0031] In one embodiment, the diameter of the fourth pipe 192 is smaller than the diameter of the first pipe 163 .

[0032] In one embodiment, the device for sealing the spray device further comprises a backup spray device;

[0033] The standby spray device includes a standby water injection pipeline 21, a standby first valve 22, a standby second valve 23 and a standby water injection device 24;

[0034] The backup water injection pipe 21 passes through the wall 15 and is respectively connected to the refueling water tank 10 and the backup water injection device 24. The backup first valve 22 is set on the backup water injection pipe 21 between the wall 15 and the refueling water tank 10, and the backup second valve 23 is set on the wall 15 and the backup water injection device 24.

[0035] In one embodiment, the device for verifying the sealing performance of the containment spray device further comprises a backup device for verifying the sealing performance of the containment spray device;

[0036] The standby verification spray device sealing device includes a standby first verification unit 25 and a standby second verification unit 26; the standby first verification unit 25 is connected to the water injection pipe 21 between the standby first valve 22 and the standby second valve 23, and the standby second verification unit 26 is connected to the standby water injection pipe 21 between the standby second valve 23 and the standby water injection device 24;

[0037] Open the spare first verification unit 25 and observe whether liquid flows out of the spare first verification unit 25 to verify the sealing performance of the spare first valve 22;

[0038] The backup first verification unit 25 includes a backup hose 251. When the backup water injection pipe 21 between the backup first valve 22 and the backup second valve 23 is filled with non-radioactive water through the backup hose 251, the backup second verification unit 26 is opened to observe whether radioactive water flows out of the backup second verification unit 26 to verify the sealing of the backup second valve 23.

[0039] The implementation of this utility model has the following beneficial effects: the device for verifying the sealing of the containment spray system includes a first verification unit 16 and a second verification unit 17. The first verification unit 16 is connected to the water pipe 11 between the first valve 12 and the second valve 13, and the second verification unit 17 is connected to the water pipe 11 between the second valve 13 and the water injection equipment 14. When the first verification unit is opened, liquid outflow can be observed to determine whether the first valve is tightly closed. The flexible hose allows the second verification unit to be opened when the water injection pipe between the first and second valves is filled with non-radioactive liquid, and the second verification unit is opened to observe whether radioactive water flows out of the second verification unit to verify the sealing of the second valve. This method not only improves the safety of the test, but also simplifies post-test cleaning and disposal, reducing the generation of additional radioactive wastewater. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0041] Figure 1 It is a structural diagram of the first verification unit and the second verification unit of the utility model;

[0042] Figure 2 This is a schematic diagram of the overall structure of the device for verifying the sealing performance of the containment spray device of the utility model;

[0043] Figure 3 It is a schematic diagram of experimental results obtained by using the device for verifying the sealing performance of the containment spray device of the present invention.

[0044] 10-Refueling water tank, 11-Water injection pipe, 12-First valve, 13-Second valve, 14-Water injection device, 15-Wall, 16-First verification unit, 161-Hose, 162-First verification valve, 163-First pipeline, 17-Second verification unit, 171-Second verification valve, 172-Second pipeline, 18-Exhaust unit, 181-Exhaust valve, 182-Third pipeline, 19-Drainage unit, 191-Drainage valve, 192-Fourth pipeline

[0045] 21-spare water injection pipeline, 22-spare first valve, 23-spare second valve, 24-spare water injection device, 25-spare first verification unit, 251-spare hose, 26-spare second verification unit. DETAILED DESCRIPTION

[0046] In order to provide a clearer understanding of the technical features, objectives, and effects of the present invention, a specific embodiment of the present invention is now described in detail with reference to the accompanying drawings. In the following description, it should be understood that the orientations or positional relationships indicated by "top," "bottom," "inside," "outside," etc. are based on the orientations or positional relationships shown in the accompanying drawings and are constructed and operated in specific orientations. These are merely for the purpose of facilitating the description of the present technical solution and do not indicate that the modules or components referred to must have specific orientations. Therefore, they should not be construed as limitations on the present invention.

[0047] It should also be noted that, unless otherwise expressly specified or limited, terms such as "connected," "fixed," and "disposed" should be understood broadly. For example, they can refer to fixed connections, detachable connections, or integration; they can refer to mechanical connections or connections; they can refer to direct connections or indirect connections through an intermediate medium; they can refer to internal connectivity between two elements or interactions between two elements. When an element is referred to as being "on" or "under" another element, the element can be "directly" or "indirectly" located above the other element, or one or more intervening elements may be present. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0048] In the following description, specific details such as specific system structures and techniques are provided for purposes of illustration, not limitation, to facilitate a thorough understanding of the embodiments of the present invention. However, it will be apparent to those skilled in the art that the present invention may be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, modules, circuits, and methods are omitted to avoid obscuring the description of the present invention with unnecessary detail.

[0049] It should be noted that the present invention can be applied to a containment spray device or a containment injection device.

[0050] like Figure 1 As shown, the device for verifying the sealing performance of the containment spray device in this embodiment includes a refueling water tank 10, a water injection pipeline 11, a first valve 12, a second valve 13 and a water injection device 14;

[0051] The water injection pipe 11 passes through the wall 15 and is connected to the refueling water tank 10 and the water injection device 14 respectively. The first valve 12 is set on the water injection pipe 11 between the wall 15 and the refueling water tank 10, and the second valve 13 is set on the water injection pipe 11 between the wall 15 and the water injection device 14. The device for verifying the sealing performance of the containment spray device includes a first verification unit 16 and a second verification unit 17;

[0052] The first verification unit 16 is connected to the water injection pipe 11 between the first valve 12 and the second valve 13 , and the second verification unit 17 is connected to the water injection pipe 11 between the second valve 13 and the water injection device 14 ;

[0053] Open the first verification unit 16 and observe whether liquid flows out of the first verification unit 16 to verify the sealing of the first valve 12;

[0054] The first verification unit includes a hose 161. When the water injection pipe 11 between the first valve 12 and the second valve 13 is filled with non-radioactive water through the hose 161, the second verification unit 17 is opened to observe whether radioactive water flows out of the second verification unit 17 to verify the sealing of the second valve 13.

[0055] It should be noted that the non-reflective water may be one of pure water, deionized water and salt water.

[0056] Specifically, first, the first verification unit 16 is opened and observed to see if any liquid flows out, thereby preliminarily verifying the sealing of the first valve 12. Next, to more accurately verify the sealing of the second valve 13, a hose 161 is used to effectively verify the valve's sealing without directly introducing a radioactive working medium, such as boric acid, thereby significantly improving the safety and operability of the test. During the verification process, non-radioactive water, such as purified or deionized water, is injected into the water injection pipe 11 between the first and second valves 12, 13 through the hose 161 until the pipe section is completely filled. This step ensures that no residual substances that could affect the verification results remain in the pipe during the subsequent sealing verification. Subsequently, only the outlet of the second verification unit 16 is opened and checked for liquid outflow. If the second valve 12 is properly sealed, no liquid will flow out of the second verification unit 16 due to its tight sealing. In addition, the hose 161 and its related connectors should be designed to ensure that they can withstand the pressure during the test and are easy to install and remove so that they can be thoroughly cleaned, maintained and dismantled after the test, thereby avoiding any possible radioactive contamination.

[0057] like Figure 2 Furthermore, the first verification unit 16 also includes a first verification valve 162 and a first pipe 163; one end of the first pipe 163 is connected to the water injection pipe 11 between the first valve 12 and the second valve 13, and the other end thereof is connected to the hose 161, and the first verification valve 162 is arranged on the first pipe 163; by opening the first verification unit 16, observing whether liquid flows out of the first verification unit 16 to verify the sealing of the first valve 12 includes: by opening the first verification valve 162, observing whether liquid flows out of the first pipe 163 to verify the sealing of the first valve 12.

[0058] It should be noted that the sealing of first valve 12 can be effectively verified by opening first verification valve 162 and observing whether liquid flows out of first pipe 163. If first valve 12 is tightly closed, no liquid should flow out of first pipe 163 even after opening first verification valve 162. Conversely, if liquid flows out of first pipe 163, first valve 12 may be leaking and requires further inspection or replacement.

[0059] Furthermore, the second verification unit 17 includes a second verification valve 171 and a second pipeline 172;

[0060] The second pipe 172 is connected to the water injection pipe 11 between the second valve 13 and the water injection device 14, and the second verification valve 171 is set on the second pipe 172; opening the second verification unit 17 and observing whether radioactive water flows out of the second verification unit 17 to verify the sealing of the second valve 13 includes: opening the second verification valve 171 and observing whether radioactive water flows out of the second pipe 172 to verify the sealing of the second valve 13.

[0061] It should be noted that the sealing of second valve 13 can be accurately verified by opening second verification valve 171 and carefully observing whether radioactive water flows out of second pipe 172. If second valve 13 is tightly closed, then after hose 161 is filled with non-radioactive water and the pressure is maintained for a period of time to ensure stable pressure, no liquid should flow out of second pipe 172 even after second verification valve 171 is opened. Conversely, if radioactive water is observed to flow out of second pipe 172, it indicates that second valve 13 may be leaking and requires further inspection or replacement.

[0062] Furthermore, the device for verifying the sealing of the spray device further includes an exhaust unit 18; the exhaust unit 18 is connected to the water injection pipe 11 between the wall 15 and the first verification unit 16; the exhaust unit 18 ensures that the water injection pipe 11 between the first valve 12 and the second valve 13 is free of gas and filled with non-radioactive water;

[0063] It should be noted that during the water filling process, the exhaust unit must be continuously observed until water flows out steadily and then closed. This serves as a sign that the air has been completely discharged. The outlet of the exhaust unit is directly connected to the atmospheric environment.

[0064] Furthermore, the exhaust unit 18 includes an exhaust valve 181 and a third pipe 182; the third pipe 182 is connected to the water injection pipe 11 between the wall 15 and the first verification unit 16, and the exhaust valve 181 is provided on the third pipe 182; the exhaust unit 18 is used to render the water injection pipe 11 between the first valve 12 and the second valve 13 gas-free and filled with non-radioactive water, including: the exhaust valve 181 is used to render the water injection pipe 11 between the first valve 12 and the second valve 13 gas-free and filled with non-radioactive water.

[0065] Furthermore, the device for verifying the sealing of the spray device also includes a drainage unit 19; the drainage unit 19 is connected to the water injection pipe 11 between the wall 15 and the second valve 13; after verifying the sealing of the second valve 13, the gas in the water injection pipe 11 between the first valve 12 and the second valve 13 is removed through the exhaust valve 181, and the non-radioactive water in the water injection pipe 11 between the first valve 12 and the second valve 13 is then removed through the drainage unit 19.

[0066] It should be noted that after verifying the sealing of second valve 13, the gas in water injection pipe 11 between first valve 12 and second valve 13 is first removed through exhaust valve 181. Subsequently, the non-radioactive water in this pipe section is drained through drainage unit 19. This drainage process can also be accomplished by both the second verification unit and the drainage unit.

[0067] Furthermore, the drainage unit 19 includes a drainage valve 191 and a fourth pipe 192; the fourth pipe 192 is connected to the water injection pipe 11 between the wall 15 and the second valve 13; and draining the non-radioactive water in the water injection pipe 11 between the first valve 12 and the second valve 13 through the drainage unit 19 includes draining the non-radioactive water in the water injection pipe 11 between the first valve 12 and the second valve 13 through the drainage valve 191.

[0068] Furthermore, the diameter of the fourth pipe 192 is smaller than the diameter of the first pipe 163 .

[0069] It should be noted that the drainage action is flexible and can be completed by the drainage unit 19, that is, the fourth pipe 192 alone, or by the second verification unit and the drainage unit 19 in collaboration. Since the diameter of the fourth pipe 192 is smaller than the diameter of the first pipe 163, the drainage method can be flexibly decided according to the situation. If rapid drainage is required, the valves of the first verification unit 16 and the drainage unit 19 can be opened at the same time, and the large diameter of the first pipe 163 can be used to accelerate drainage. However, if the drainage speed needs to be precisely controlled to avoid impact on the equipment, it is more appropriate to use the fourth pipe 192 with a smaller diameter alone. This flexibility improves drainage efficiency and protects the safe operation of the spraying device and related equipment.

[0070] Furthermore, the sealing device of the spray device also includes a spare spray device; the spare spray device includes a spare water injection pipe 21, a spare first valve 22, a spare second valve 23 and a spare water injection device 24; the spare water injection pipe 21 passes through the wall 15 and is respectively connected to the refueling water tank 10 and the spare water injection device 24, the spare first valve 22 is arranged on the spare water injection pipe 21 between the wall 15 and the refueling water tank 10, and the spare second valve 23 is arranged on the wall 15 and the spare water injection device 24.

[0071] Furthermore, the device for verifying the sealing of the containment spray device also includes a spare device for verifying the sealing of the containment spray device; the spare device for verifying the sealing of the spray device includes a spare first verification unit 25 and a spare second verification unit 26; the spare first verification unit 25 is connected to the water injection pipeline 21 between the spare first valve 22 and the spare second valve 23, and the spare second verification unit 26 is connected to the spare water injection pipeline 21 between the spare second valve 23 and the spare water injection device 24; by opening the spare first verification unit 25, observing whether liquid flows out of the spare first verification unit 25 to verify the sealing of the spare first valve 22; the spare first verification unit 25 includes a spare hose 251, and when the spare water injection pipeline 21 between the spare first valve 22 and the spare second valve 23 is filled with non-radioactive water through the spare hose 251, by opening the spare second verification unit 26, observing whether radioactive water flows out of the spare second verification unit 26 to verify the sealing of the spare second valve 23.

[0072] It should be noted that the backup spray system and its corresponding backup spray system seal verification device are designed to enable rapid switching to the backup system in the event of a failure or maintenance requirement, ensuring the safe operation of the nuclear facility. The backup spray system includes a complete water injection system, and the backup spray system seal verification device also has the ability to verify the backup spray system's seal.

[0073] like Figure 3 As shown, 4EAS950VB is the second valve 13 of the present invention, 4EAS951VB is the backup second valve 23, 4EAS952VB is the first valve 12, and 4EAS953VB is the backup first valve 22. Before this experiment, it was speculated that the liquid level in the PTR001BA refueling water tank might drop due to water being used for core cooling or change due to the injection of fresh water. In an accident, it is crucial that the water in the PTR001BA refueling water tank is used for core cooling. After testing, using the device described in this invention, the liquid level in the PTR001BA refueling water tank remained unchanged throughout the entire process, and no radioactive material was detected. Figure 3The experimental results obtained using the device are presented.

[0074] This test has the following advantages:

[0075] 1. The hose is filled with non-radioactive water, which will not cause radioactive hot spots in the first valve, second valve, spare first valve, and spare second valve during the test, and there is no secondary risk.

[0076] 2. The hose connection path during the test is relatively simple.

[0077] 3. There is no need to establish a temporary control zone in the relevant area before the test.

[0078] 4. Completely solved the problem of high exposure dose rate after previous tests.

[0079] 5. Effectively reduce the generation of radioactive wastewater and lower the collective dose during overhaul.

[0080] It can be understood that the above embodiments only express the preferred implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the patent scope of the present invention. It should be pointed out that for ordinary technicians in this field, without departing from the concept of the present invention, the above technical features can be freely combined, and several deformations and improvements can be made, all of which fall within the scope of protection of the present invention. Therefore, all equivalent changes and modifications made to the scope of the claims of the present invention should fall within the scope of coverage of the claims of the present invention.

Claims

1. A device for verifying the sealing performance of a containment spray device, the spray device comprising a refueling water tank (10), a water injection pipe (11), a first valve (12), a second valve (13) and a water injection device (14); The water injection pipe (11) passes through the wall (15) and is connected to the refueling water tank (10) and the water injection device (14) respectively. The first valve (12) is arranged on the water injection pipe (11) between the wall (15) and the refueling water tank (10), and the second valve (13) is arranged on the water injection pipe (11) between the wall (15) and the water injection device (14). The invention is characterized in that: The device for verifying the sealing performance of the containment spray device comprises a first verification unit (16) and a second verification unit (17); The first verification unit (16) is connected to the water injection pipe (11) between the first valve (12) and the second valve (13), and the second verification unit (17) is connected to the water injection pipe (11) between the second valve (13) and the water injection device (14); Opening the first verification unit (16) and observing whether liquid flows out of the first verification unit (16) to verify the sealing performance of the first valve (12); The first verification unit comprises a hose (161), and when the water injection pipe (11) between the first valve (12) and the second valve (13) is filled with non-radioactive water through the hose (161), the second verification unit (17) is opened to observe whether non-radioactive water flows out of the second verification unit (17) to verify the sealing performance of the second valve (13).

2. The device for verifying the sealing performance of the containment spray device according to claim 1, characterized in that: The first verification unit (16) further includes a first verification valve (162) and a first pipeline (163); One end of the first pipe (163) is connected to the water injection pipe (11) between the first valve (12) and the second valve (13), and the other end is connected to the hose (161). The first verification valve (162) is provided on the first pipe (163); Opening the first verification unit (16) and observing whether liquid flows out of the first verification unit (16) to verify the sealing performance of the first valve (12) includes: The sealing performance of the first valve (12) is verified by opening the first verification valve (162) and observing whether liquid flows out of the first pipe (163).

3. The device for verifying the sealing performance of the containment spray device according to claim 2, characterized in that: The second verification unit (17) includes a second verification valve (171) and a second pipeline (172); The second pipe (172) is connected to the water injection pipe (11) between the second valve (13) and the water injection device (14), and the second verification valve (171) is arranged on the second pipe (172); Opening the second verification unit (17) and observing whether radioactive water flows out of the second verification unit (17) to verify the sealing performance of the second valve (13) includes: The second verification valve (171) is opened to observe whether radioactive water flows out of the second pipe (172) to verify the sealing performance of the second valve (13).

4. The device for verifying the sealing performance of the containment spray device according to claim 3, characterized in that: The device for verifying the sealing performance of the containment spray device further comprises an exhaust unit (18); The exhaust unit (18) is connected to the water injection pipe (11) between the wall (15) and the first verification unit (16); The exhaust unit (18) enables the water injection pipeline (11) between the first valve (12) and the second valve (13) to be free of gas and filled with non-radioactive water.

5. The device for verifying the sealing performance of the containment spray device according to claim 4, characterized in that: The exhaust unit (18) includes an exhaust valve (181) and a third pipe (182); The third pipe (182) is connected to the water injection pipe (11) between the wall (15) and the first verification unit (16), and the exhaust valve (181) is provided on the third pipe (182); The process of making the water injection pipe (11) between the first valve (12) and the second valve (13) free of gas and filled with non-radioactive water by the exhaust unit (18) includes: The exhaust valve (181) enables the water injection pipe (11) between the first valve (12) and the second valve (13) to be free of gas and filled with non-radioactive water.

6. The device for verifying the sealing performance of the containment spray device according to claim 5, characterized in that: The device for verifying the sealing performance of the containment spray device further comprises a drainage unit (19); The drainage unit (19) is connected to the water injection pipe (11) between the wall (15) and the second valve (13); After verifying the sealing performance of the second valve (13), the gas in the water injection pipe (11) between the first valve (12) and the second valve (13) is discharged through the exhaust valve (181), and the radioactive-free water in the water injection pipe (11) between the first valve (12) and the second valve (13) is discharged through the drainage unit (19).

7. The device for verifying the sealing performance of the containment spray device according to claim 6, characterized in that: The drainage unit (19) includes a drainage valve (191) and a fourth pipe (192); The fourth pipe (192) is connected to the water injection pipe (11) between the wall (15) and the second valve (13); The step of draining the non-radioactive water in the water injection pipe (11) between the first valve (12) and the second valve (13) through the drainage unit (19) comprises: The non-radioactive water in the water injection pipe (11) between the first valve (12) and the second valve (13) is then discharged through the drainage valve (191).

8. The device for verifying the sealing performance of the containment spray device according to claim 7, characterized in that: The diameter of the fourth pipeline (192) is smaller than the diameter of the first pipeline (163).

9. The device for verifying the sealing performance of the containment spray device according to claim 1, characterized in that: The device for sealing the spray device also includes a spare spray device; The standby spray device comprises a standby water injection pipeline (21), a standby first valve (22), a standby second valve (23) and a standby water injection device (24); The standby water injection pipe (21) passes through the wall (15) and is respectively connected to the refueling water tank (10) and the standby water injection device (24); the standby first valve (22) is arranged on the standby water injection pipe (21) between the wall (15) and the refueling water tank (10); and the standby second valve (23) is arranged on the wall (15) and the standby water injection device (24).

10. The device for verifying the sealing performance of the containment spray device according to claim 9, characterized in that: The device for verifying the sealing performance of the containment spray device also includes a standby device for verifying the sealing performance of the containment spray device; The standby device for verifying the sealing performance of the containment spray device comprises a standby first verification unit (25) and a standby second verification unit (26); the standby first verification unit (25) is connected to the standby water injection pipeline (21) between the standby first valve (22) and the standby second valve (23); the standby second verification unit (26) is connected to the standby water injection pipeline (21) between the standby second valve (23) and the standby water injection device (24); Opening the spare first verification unit (25) and observing whether liquid flows out of the spare first verification unit (25) to verify the sealing performance of the spare first valve (22); The standby first verification unit (25) includes a standby hose (251). When the standby water injection pipe (21) between the standby first valve (22) and the standby second valve (23) is filled with non-radioactive water through the standby hose (251), the standby second verification unit (26) is opened to observe whether radioactive water flows out of the standby second verification unit (26) to verify the sealing performance of the standby second valve (23).

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