Airtightness test method for door closing device

Abstract

To provide an on-site test method capable of confirming airtightness performance when a door body closing device to be installed at a nuclear power facility is installed.SOLUTION: An airtightness test method of a door body closing device 100 is executed on the door body closing device 100 for sealing an opening part 200 of a nuclear reactor building, which is revealed when an existing blowout panel 3 sealing the opening part 200 is opened. A door body 4 is closed at the start of an airtightness test of the door body closing device 100 installed at the nuclear reactor building, and a space 5 is formed by the door body 4, a seal part 12 provided at the opening part 200 and its periphery, and the existing blowout panel 3 so that air in the space 5 provided on the side of the nuclear reactor building in the door body closing device 100 is discharged. Thus, the airtightness is confirmed without making a change to surrounding installations.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a confirmation test method capable of confirming the airtight performance of a door closing device installed at a nuclear facility on-site. [Background technology]

[0002] In nuclear power plants and other nuclear facilities, openings are provided in the walls of the reactor building and turbine building beforehand and are sealed with blowout panels (BOPs: bursting disc safety devices). Airtightness is maintained even if steam containing radioactive materials leaks from the reactor containment vessel, but if the pressure inside the building increases suddenly, the blowout panels are opened to release the pressure and prevent the entire building from exploding.

[0003] The blowout panel falls to the outside of the building when the members that secure it to the building deform due to the increase in pressure inside the building. An invention for a blowout panel opening device that can open the blowout panel remotely even in a total power loss state and can be installed from outside the building has also been disclosed.

[0004] After the new regulations come into effect, nuclear facilities will be required to install door closing devices to close openings that are opened to release pressure that builds up inside the building due to some kind of accident. The door closing devices are required to ensure the airtightness of the reactor building while they are closing the openings. Therefore, the door closing devices themselves are required to be airtight.

[0005] Patent document 1 discloses that a blocking door with an area larger than the opening of the building and its sliding mechanism are provided on the outside of the building near the blowout panel, and the blocking door slides closed when the blowout panel is removed. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Patent No. 6430055 Summary of the Invention [Problem to be solved by the invention]

[0007] The gate closing device is subjected to an airtightness confirmation test at the time of shipment from the factory, and its airtightness is confirmed before it is installed in the reactor building, but its airtightness must also be confirmed after it is installed on-site. However, because it is a large-scale facility, there is an issue in that it is difficult to provide a test device to confirm the closing function after it is installed in the reactor building.

[0008] In addition, the reactor building in which it will be installed will itself be airtight, and when checking the closure function, it will be necessary to ensure that it does not affect surrounding equipment.

[0009] The present invention has been made to solve the above-mentioned problems, and has an object to provide a test method that can confirm the airtightness performance on-site when installing a door closing device to be installed in a nuclear facility. [Means for solving the problem]

[0010] In order to achieve the above object, the method for testing airtightness of a door closing device of the present invention is a method for testing airtightness of a door closing device that closes an opening that is generated when a blowout panel that closes the opening in a reactor building is opened, and is characterized in that at the start of an airtight test of the door closing device installed in the reactor building, the door is closed, a space is formed by the door, the opening and a seal part provided around it, and the blowout panel, and the air is exhausted from the space provided on the reactor building side of the door closing device, thereby checking the airtightness without making any changes to the surrounding equipment. Other aspects of the present invention will be described in the embodiments described later. Effect of the Invention

[0011] According to the present invention, even after the door closing device is installed in the reactor building, the airtight performance of the door closing device can be confirmed without affecting surrounding equipment and without setting up large-scale testing equipment. [Brief description of the drawings]

[0012] [Figure 1] FIG. 1 is a schematic side view showing an embodiment of the present invention in which airtightness of a sliding door closing device is confirmed by creating a negative pressure inside a reactor building without using a test jig or the like. [Diagram 2] This is a schematic side view of the present invention, in which a simple, portable test jig that does not affect surrounding equipment is installed and connected outside a building to check the airtightness of a sliding door closing device. [Diagram 3] FIG. 1 is a schematic side view of the present invention, in which a simple, portable test jig that does not affect surrounding equipment is installed and connected inside a building to check the airtightness of a sliding door closing device. [Figure 4] FIG. 1 is an explanatory diagram of the present invention for carrying out an airtightness check of a side-opening door closing device by creating a negative pressure inside a reactor building without using a test jig or the like, where (a) is a schematic side view and (b) is an AA cross-sectional view. [Diagram 5] FIG. 1 is an explanatory diagram of the present invention for carrying out confirmation of airtightness of a side-opening door closing device by installing and connecting a simple and portable test jig that does not affect surrounding equipment to the reactor building side, (a) being a schematic side view, and (b) being an AA cross-sectional view. [Figure 6] FIG. 1 is an explanatory diagram of the present invention for confirming the airtightness of a side-opening door closing device by installing and connecting a simple and portable test jig that does not affect surrounding equipment to the turbine building, where (a) is a schematic side view and (b) is an AA cross-sectional view. [Figure 7] 1 is a perspective view showing a state in which a door of a sliding door closing device according to the present embodiment is open. FIG. [Figure 8] 1 is a perspective view showing a state in which a door of a sliding door closing device according to the present embodiment is closed. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment for carrying out the present invention will be described in detail with reference to the accompanying drawings. Fig. 1 is a schematic side view of the present invention, in which the airtightness of a sliding door closing device 100 is confirmed by creating a negative pressure inside the reactor building without using a test jig or the like. Here, the left side of the page shows the inside of the reactor building and the right side shows the outside of the reactor building with respect to the existing blowout panel 3. Here, an overview of the sliding door closing device 100 will be described with reference to Figs. 7 and 8.

[0014] Fig. 7 is a perspective view showing a state in which the door of the sliding door closing device 100 according to this embodiment is open. Fig. 8 is a perspective view showing a state in which the door of the sliding door closing device 100 according to this embodiment is closed.

[0015] The door body closing device 100 of this embodiment is a device that closes an opening 200 in a building (see Figure 7) that occurs when an existing blowout panel 3 (see Figure 1) that closes the opening 200 in a building is opened.

[0016] As shown in FIG. 7, the door body closing device 100 comprises a door body 4 that closes an opening 200 in the building, an open position holding mechanism 21 that holds the door body 4 in an open position where it does not overlap the opening 200 in the building when the blowout panel is in a sealed state, a closed position holding mechanism 22 that holds the door body 4 in a closed position that closes the opening 200 in the building when the blowout panel is in an open state, a hanger rail 23 that suspends the door body 4 from the open position to the closed position, a guide mechanism that assists the linear motion of the door body 4 as it slides, and a drive unit 24 for opening and closing the door body 4.

[0017] 1, the door body 4 is a metal plate or the like that is slightly larger than the building opening 200. The door body 4 can be slid (for example, moved in the left-right direction) by a drive device 24 along the reactor building wall 1 in a range from an open position (see FIG. 7) where it does not completely overlap with the building opening 200 to a closed position (see FIG. 8) where it completely overlaps with the building opening 200.

[0018] The building opening 200 has a seal portion 12 that maintains airtightness at the contact portion between the building opening 200 and the door body 4 when the door body 4 reaches the closed position. The seal portion 12 is attached to the surface of the reactor building wall 1 so as to surround the building opening 200, and contacts the peripheral portion of the back surface of the door body 4 when the door body 4 reaches the closed position. If the seal portion 12 is attached to the back surface of the door body 4, it is difficult to perform maintenance on the seal portion 12 without removing the door body 4 (especially when it is located at a high place or is heavy), but if it is around the building opening 200, it is easy to maintain the seal portion 12 in the open position.

[0019] Returning to FIG. 1, when an airtightness test of the door closing device 100 installed in the reactor building begins, the door 4 is closed to form a space 5 surrounded by the door 4, the opening 200 and the seal portion 12 provided around it, and the existing blowout panel 3.

[0020] An openable and closable hole is provided in advance in the existing blowout panel 3 as a test penetration hole 2 (inspection port), and after the space 5 is formed, the test penetration hole 2 is opened. After that, the inside of the reactor building is made negative pressure by the SGTS (Stand-By Gas Treatment System). Assuming that the reactor building and the stand on which the door closing device 100 is attached do not have a path leading to the outside of the reactor building, if the door closing device 100 is airtight, the inside of the reactor building will be kept at negative pressure. In this way, the airtight performance of the door closing device 100 can be confirmed even after it is installed in the reactor building.

[0021] In addition, the SGTS is a system that, in the event of an accident, considers the release of radioactive materials into the reactor building, and filters and adsorbs the air inside the building using high-efficiency particle filters, charcoal filters, etc., before releasing the air from the exhaust stack. Also, the test penetration hole 2 is normally closed, and is opened during inspection.

[0022] Fig. 2 is a schematic side view of the present invention, in which a simple and portable test jig that does not affect surrounding facilities is installed and connected outside a building to check the airtightness of a sliding door closing device 100. Referring to Fig. 2, an example of performing an airtight test by connecting a portable test jig to the door closing device 100 is shown.

[0023] First, at the start of an airtightness test of the door closing device 100 installed in the reactor building, the door 4 is closed to form a space 5 surrounded by the door 4, the opening 200 and the seal portion 12 provided around it, and the existing blowout panel 3. An openable and closable test through hole 2 (inspection port) is provided in advance in the door closing device 100, and a test jig is installed here.

[0024] Incidentally, the jig generally refers to a "work tool having a structure for positioning and fixing parts to perform work" (mounting tool, etc.), but the jig here refers to an inspection tool, etc. That is, the test jig here is a simple one that can be carried around, such as a differential pressure gauge 6, a vacuum pipe 7, a valve 8, and a vacuum pump 9. After connecting these test jigs to the test penetration hole 2 (inspection port), the vacuum pump 9 is started to exhaust the air in the space 5 surrounded by the existing blowout panel 3 and the door body 4 of the door body closing device 100, etc. Assuming that the frame on which the existing blowout panel 3 and the door body closing device 100 are attached does not have a path leading to the inside of the reactor building, this space 5 can be made negative pressure if the door body closing device 100 is airtight. The pressure in this space 5 can be measured with the differential pressure gauge 6 to confirm the airtightness of the door body closing device 100.

[0025] FIG. 3 is a schematic side view of the present invention in which a simple and portable test jig that does not affect surrounding equipment is installed and connected inside a building to check the airtightness of a sliding door closing device 100.

[0026] After connecting the test jig to the test through hole 2 (inspection port), the vacuum pump 9 is started to exhaust the air from the space 5 surrounded by the existing blowout panel 3 and the door 4 of the door closing device 100. Assuming that the frame on which the existing blowout panel 3 and the door closing device 100 are mounted does not have a path leading to the outside of the reactor building, this space 5 can be made negative pressure if the door closing device 100 is airtight. The pressure in this space 5 is measured with a differential pressure gauge 6, and the airtightness of the door closing device 100 can be confirmed.

[0027] 1 to 3 show an example of a sliding type door closing device 100, but the present invention is not limited to this. An example of a side-opening type door closing device 100 will be described with reference to Figs. 4 to 6. Figs. 4 to 6 show an example of a side-opening type door closing device 100A provided on the MS tunnel room wall 10.

[0028] A nuclear power plant consists of a reactor building that houses the reactor pressure vessel, a turbine building that houses the turbine that rotates with steam pumped from the reactor pressure vessel, and an MS tunnel room that connects the reactor building and the turbine building. The MS tunnel room is also called the main steam line tunnel room (MSIV room). The MS tunnel room wall 10 is provided with a blowout panel and the like that is pushed out to the outside of the reactor building and detached to release the internal pressure when the internal pressure increases abnormally.

[0029] Fig. 4 is an explanatory diagram of the present invention for checking the airtightness of a side-opening door closing device by creating a negative pressure inside the reactor building without using a test jig or the like, (a) is a schematic side view, and (b) is an AA cross-sectional view. In Fig. 4, R / B is an abbreviation for Reactor Building.

[0030] The side-opening door closing device 100A is a closing device that supports the door body 4 rotatably relative to a support body by a shaft extending in the vertical direction, and allows the door body 4 to open sideways (like a double door).

[0031] When an airtight test of the door body closing device 100A installed on the MS tunnel chamber wall 10 begins, the door body 4 is closed, forming a space 5 surrounded by the door body 4, the airtight frame 11 on which it is mounted, the seal portion 12 provided around the airtight frame 11, and the existing blowout panel 3.

[0032] An openable and closable hole is provided in the existing blowout panel 3 as a test penetration hole 2 (inspection port), and the test penetration hole 2 is opened after the space 5 is formed. The inside of the reactor building is then made negative pressure by the SGTS (Stand-By Gas Treatment System). Assuming that the reactor building and the rack on which the door closing device 100A is mounted do not have a path leading to the turbine building, the inside of the reactor building will be kept at negative pressure if the door closing device 100A is airtight. In this way, the airtight performance of the door closing device 100A can be confirmed even after it is installed in the reactor building.

[0033] FIG. 5 is an explanatory diagram showing how a simple and portable test jig that does not affect surrounding equipment is installed and connected to the reactor building to check the airtightness of a side-opening door closing device, (a) being a schematic side view and (b) being an AA cross-sectional view.

[0034] After connecting the test jig to the test through hole 2 (inspection port), the vacuum pump 9 is started to exhaust the air from the space 5 surrounded by the existing blowout panel 3 and the door 4 of the door closing device 100A. Assuming that the airtight frame 11 on which the existing blowout panel 3 and the door closing device 100A are mounted does not have a path leading to the turbine building, this space 5 can be made negative pressure if the door closing device 100A is airtight. The pressure in this space 5 is measured with a differential pressure gauge 6, and the airtightness of the door closing device 100 can be confirmed.

[0035] FIG. 6 is an explanatory diagram showing how a simple and portable test jig that does not affect surrounding equipment is installed and connected to the turbine building to check the airtightness of a side-opening door closing device, (a) being a schematic side view and (b) being an AA cross-sectional view.

[0036] After connecting these test jigs to the test penetration hole 2 (inspection port), the vacuum pump 9 is started to exhaust the air from the space 5 surrounded by the existing blowout panel 3 and the door 4 of the door closing device 100A. Assuming that the airtight frame 11 on which the existing blowout panel 3 and the door closing device 100A are mounted does not have a path leading to the inside of the reactor building, this space 5 can be made negative pressure if the door closing device 100A is airtight. The pressure in this space 5 is measured with a differential pressure gauge 6, and the airtightness of the door closing device 100 can be confirmed.

[0037] The method for testing the airtightness of the door closing device 100 of this embodiment involves forming a space 5 between the door closing device 100 and the existing blowout panel 3 using a stand or the like on which it is mounted, and exhausting the air from the space 5 provided on the reactor building side of the door closing device 100 to check the airtightness of that space.

[0038] In addition, in the airtightness confirmation test, an openable and closable hole (e.g., test through hole 2) is installed in the existing blowout panel 3, the inside of the reactor building is made negative pressure, and the air in the space 5 formed on the reactor building side of the door closing device 100 is exhausted, thereby confirming the airtightness of the door closing device 100.

[0039] Furthermore, an airtightness test can be performed by connecting a portable test tool such as a vacuum pump 9 or a differential pressure gauge 6 to the existing blowout panel 3 or the door closing device 100 and exhausting the air from the space enclosed by the door closing device 100 and the existing blowout panel 3. [Explanation of symbols]

[0040] 1. Reactor building wall 2 Test hole 3 Blowout Panel 4 Door body 5 Space 6. Differential pressure gauge 7 Vacuum piping 8 Valve 9. Vacuum Pump 10 MS Tunnel Room Wall 11 Airtight stand 12 Seal part 21 Open position holding mechanism 22 Closed position holding mechanism 23 Clothes rail 24 Drive unit 100,100A Door Closing Device 200 Opening

Claims

1. A method for testing airtightness of a door closing device that closes an opening in a reactor building, the method comprising the steps of: When an airtight test of the door closing device installed in the reactor building is started, the door is closed, and a space is formed with the door, the opening and the seal portion installed around it, and the blowout panel, and the air in the space installed on the reactor building side of the door closing device is exhausted, thereby confirming airtightness without making any changes to the surrounding facilities. A method for testing an airtightness of a door closing device.

2. The method for testing an airtightness of a door closing device according to claim 1, A negative pressure is created inside the reactor building through the hole of the blowout panel, which has an openable hole communicating with the space. A method for testing an airtightness of a door closing device.

3. The method for testing an airtightness of a door closing device according to claim 1, The door closing device is provided with an openable and closable hole communicating with the space. A method for testing an airtightness of a door closing device.

4. The method for testing an airtightness of a door closing device according to any one of claims 1 to 3, Connect a portable test facility that does not affect other facilities to the space and exhaust the air. A method for testing an airtightness of a door closing device, comprising:

Images