Reactor upper assembly leveling device and method

Abstract

The present application belongs to the technical field of nuclear power plant reactor maintenance, and specifically relates to a device and method for leveling the upper assembly of a reactor; the device comprises: a track, a leveling trolley and a remote control box; the track is fixed on the upper assembly crossbeam in a circular shape; wheels are installed at the lower part of the leveling trolley, and the wheels move on the track; a counterweight is fixed inside the leveling trolley; the leveling trolley is also provided with a brake for fixing the position of the leveling trolley on the track; the remote control box is used to control the movement of the leveling trolley along the track and the opening and closing of the brake. The present application only needs to be lifted once in the initial state to complete the leveling, and there is no need to lift and lower the upper assembly multiple times, and the risk of damaging the upper assembly and the surrounding valves is greatly reduced.

Description

Technical Field

[0001] The present application belongs to the technical field of nuclear power plant reactor maintenance, and specifically relates to a reactor upper component leveling device and method. Background Art

[0002] As a core component of the reactor, the reactor upper assembly is used to seal the main sealing surface of the reactor to form a dense internal space of the reactor; fix the control rod drive mechanism and its electrical equipment, fix the core instrument sensor line terminals and seals; and establish a certain pressure to prevent the fuel assembly, protection tube assembly and core basket from floating up.

[0003] During the overhaul of the unit, the upper components need to be hoisted. Before hoisting, the upper components need to be leveled. In the existing technology, the hoist ring alignment is generally used. When leveling, the leveling of the upper components and similar equipment takes about 6 hours of the overhaul critical path time; the environmental dose rate of the upper component inspection well is high, and the collective dose of radiation to the operators is about 1.2 man·mSv. Based on the high requirements for earthquake resistance, the gap between the bottom of the upper component and the upper component inspection well support is extremely small, and there are valves of other equipment 10cm around the upper component inspection well support, which has extremely high requirements for the hoist ring alignment. The risk of damaging the upper component and the surrounding valves due to multiple lifting and lowering of the upper component is high; this operation requires the consumption of a total of about 30 sets of paper clothes, all of which are radioactive solid waste, which puts a certain amount of pressure on the environment; when measuring the level, personnel need to stand under the upper component with a ruler in hand, and a high-risk operation plan needs to be prepared before the operation can be carried out; the digital level has the risk of contamination, but the digital level is a measuring instrument and needs to be sent out for calibration. Once contaminated, it cannot be sent out for calibration. Summary of the invention

[0004] The purpose of the present application is to provide a reactor upper assembly leveling device and method, so as to solve the problem in the prior art that the upper assembly leveling adopts a ring hoist with extremely high requirements, and the upper assembly is lifted and lowered many times, resulting in a high risk of damaging the upper assembly and surrounding valves.

[0005] Technical solution to achieve the purpose of this application:

[0006] In a first aspect, the present application provides a reactor upper assembly leveling device, the device comprising: a track, a leveling trolley and a remote control box;

[0007] The track is fixed on the upper assembly crossbeam in a circular shape;

[0008] The lower part of the leveling trolley is equipped with wheels, and the trolley moves on the track through the wheels; a counterweight is fixed inside the leveling trolley; the leveling trolley is also provided with a brake for fixing the position of the leveling trolley on the track;

[0009] The remote control box is used to control the movement of the leveling trolley along the track and the opening and closing of the brake.

[0010] Optionally, the device further comprises: two inclinometers;

[0011] The two inclinometers are horizontally fixed on the upper component crossbeam, and the angle between the two inclinometers and the center line of the upper component crossbeam is 90 degrees.

[0012] Optional,

[0013] A magnetic base is fixed at the lower ends of the two inclinometers and adsorbed on the crossbeam of the upper component.

[0014] Optional,

[0015] The remote control box is also used to display the horizontal data of the two inclinometers.

[0016] Optionally, the device further comprises: a manual turning device;

[0017] The manual turning device is arranged on the leveling trolley and is used for manually driving the leveling trolley to move on the track.

[0018] Optionally, there are two tracks, and the two tracks are fixed on the crossbeam of the upper component in a concentric circle structure, and the centers of the two tracks coincide with the center of the upper component;

[0019] The distance between the two rails matches the distance between the two wheels of the leveling trolley.

[0020] The second aspect of the present application provides a method for leveling a reactor upper assembly, which is applied to any one of the reactor upper assembly leveling devices provided in the first aspect of the present application; the method comprises:

[0021] When leveling the upper assembly of the reactor, the remote control box opens the brake and controls the leveling trolley to move along the track;

[0022] When the horizontality of the reactor upper assembly meets the preset requirements, the remote control box controls the brake to close to fix the position of the leveling trolley.

[0023] The beneficial technical effects of this application are:

[0024] 1) The application of a reactor upper assembly leveling device and method provided in the embodiment of the present application can save about 5 hours of critical path time for a single overhaul. Converted into power generation, a single overhaul of a single unit can generate about 2 million yuan in revenue, and 4 units can generate a total of about 200 million yuan in revenue during the unit life; a single overhaul reduces the collective radiation dose of operators by about 1 man·mSv;

[0025] 2) The application of a reactor upper assembly leveling device and method provided in the embodiment of the present application only requires lifting once in the initial state to complete the leveling, and does not require lifting and lowering the upper assembly multiple times. The risk of damaging the upper assembly and surrounding valves is greatly reduced, the number of operators and the operation time are reduced, and about 20 sets of paper clothes can be saved, reducing environmental pressure;

[0026] 3) The application of a reactor upper component leveling device and method provided in an embodiment of the present application eliminates the use of a digital level and a ruler. Personnel do not need to stand under the upper component, and there is no need to prepare high-risk operation plans. Lifting operations are more standardized. The elimination of the digital level avoids contamination of the digital level. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A schematic structural diagram of a reactor upper assembly leveling device provided in an embodiment of the present application;

[0028] Figure 2 A schematic flow chart of a method for leveling an upper reactor assembly provided in an embodiment of the present application.

[0029] In the figure:

[0030] 1- Track;

[0031] 2-leveling trolley; 21-wheel; 22-counterweight; 23-brake; 24-manual turning device;

[0032] 3-Remote control box;

[0033] 4- upper assembly crossbeam;

[0034] 5- Inclinometer. DETAILED DESCRIPTION

[0035] In order to make those skilled in the art better understand the present application, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the embodiments described below are only a part of the embodiments of the present application, not all. Based on the embodiments recorded in the present application, all other embodiments obtained by those skilled in the art without paying creative work are within the scope of protection of the present application.

[0036] See also Figure 1 , which is a structural schematic diagram of a reactor upper component leveling device provided in an embodiment of the present application.

[0037] A reactor upper assembly leveling device provided in an embodiment of the present application comprises: a track 1, a leveling trolley 2 and a remote control box 3;

[0038] The track 1 is fixed in a circular shape on the upper assembly crossbeam 4;

[0039] The leveling trolley 2 is provided with wheels 21 at the bottom thereof, and moves on the track 1 through the wheels 21; a counterweight 22 is fixed inside the leveling trolley 2; the leveling trolley 2 is also provided with a brake 23 for fixing the position of the leveling trolley 2 on the track 1;

[0040] The remote control box 3 is used to control the movement of the leveling trolley 2 along the track 1 and the opening and closing of the brake 23.

[0041] In the embodiment of the present application, when leveling, it is only necessary to lift it once in the initial state, and then the remote control box 3 can be used to control the leveling trolley 2 to move along the track 1, and the position of the leveling trolley 2 on the track 1 can be locked by the brake 23 to complete the leveling. There is no need to lift and lower the upper components many times, and the risk of damaging the upper components and surrounding valves is greatly reduced, which reduces the number of operators and the operating time, can save about 20 sets of paper clothes, and reduce environmental pressure.

[0042] In some possible implementations of the embodiments of the present application, the device may further include: two inclinometers 5;

[0043] The two inclinometers 5 are horizontally fixed on the upper component cross beam 4 , and the angle between the two inclinometers 5 and the center line of the upper component cross beam 4 is 90 degrees.

[0044] It can be understood that the two inclinometers 5 can realize the function of fast, accurate and long-distance reading of horizontal data, eliminating the use of digital levels and rulers. Personnel do not need to stand under the upper components, do not need to prepare high-risk operation plans, and the lifting operation is more standardized; the cancellation of the digital level avoids contamination of the digital level.

[0045] As an example, the lower ends of the two inclinometers 5 are fixed with magnetic seats adsorbed on the upper component crossbeam 4.

[0046] In one example, the remote control box 3 is also used to display the horizontal data of the two inclinometers 5. The personnel can judge the horizontality of the upper component through the horizontal data displayed on the remote control box 3. The personnel do not need to stand under the upper component, do not need to prepare high-risk operation plans, and the lifting operation is more standardized.

[0047] In some possible implementations of the embodiments of the present application, the device may further include: a manual turning device 24;

[0048] The manual turning device 24 is arranged on the leveling trolley 2 and is used for manually driving the leveling trolley 2 to move on the track 1 .

[0049] It is understandable that the manual turning device 24 can manually drive the leveling trolley 2 to move on the track 1 when the automatic control of the remote control box 3 fails.

[0050] In one example, there are two rails 1, and the two rails 1 are fixed on the upper component crossbeam 4 in a concentric circle structure, and the centers of the two rails 1 coincide with the center of the upper component 4;

[0051] The distance between the two rails 1 matches the distance between the two wheels 21 of the leveling trolley 2 .

[0052] The specific operation method of a reactor upper assembly leveling device provided in an embodiment of the present application is described in detail below with reference to a specific example.

[0053] When using the device, the leveling method of the upper component is as follows: install the upper component crossbeam 4 to the upper component and connect it to the ring crane; lift the upper component to a height of about 300mm from the support surface of the upper component inspection well, and start leveling after it is stable and still; the leveling personnel holds the remote control box 3, stands in the low-dose area, and checks the reading of the inclinometer 5 through the display screen on the remote control box 3 to determine whether the horizontality in the four axes exceeds 2mm; if the reading of the inclinometer 5 exceeds 2mm, open the brake 23 of the leveling trolley 2 through the remote control box 3, so that the leveling trolley 2 can achieve 360 ​​degrees on the track 1 The leveling personnel holds the remote control box 3, presses the forward button on the remote control box 3, drives the leveling trolley 2 to move to the position where the reading of the inclinometer 5 is larger, so as to level the upper component; checks the reading of the inclinometer 5 through the display screen on the remote control box 3 again, and determines whether the horizontality in the four axes exceeds 2mm; if the horizontality still does not meet the requirement, fine-tune the position of the leveling trolley 2 forward and backward until the horizontality meets the 2mm requirement; after the horizontality meets the 2mm requirement, close the brake 23 of the leveling trolley 2 through the remote control box 3 to fix the position of the leveling trolley 2; the leveling is completed, and the hoisting of the upper component begins. If the remote control box 3 fails, use the alternative method: the leveling personnel stands on the upper component crossbeam 4, turns the manual turning device 24 on the leveling trolley 2 to realize the movement of the trolley, and visually observes the reading of the inclinometer 5 until the horizontality meets the 2mm requirement.

[0054] Based on the reactor upper component leveling device provided in the above embodiment, the embodiment of the present application further provides a reactor upper component leveling method, which is applied to the reactor upper component leveling device provided in the above embodiment.

[0055] See also Figure 2 , which is a schematic flow chart of a method for leveling an upper reactor assembly provided in an embodiment of the present application.

[0056] An embodiment of the present application provides a method for leveling a reactor upper assembly, comprising:

[0057] S201: When leveling the upper assembly of the reactor, the remote control box opens the brake and controls the leveling trolley to move along the track;

[0058] S202: When the horizontality of the upper assembly of the reactor meets the preset requirements, the remote control box controls the brake to close to fix the position of the leveling trolley.

[0059] The present application is described in detail above in conjunction with the accompanying drawings and embodiments, but the present application is not limited to the above embodiments, and various changes can be made within the knowledge of ordinary technicians in the field without departing from the purpose of the present application. Any content not described in detail in the present application can adopt the existing technology.

Claims

1. A reactor upper assembly leveling device, characterized in that: The device comprises: a track, a leveling trolley and a remote control box; The track is fixed on the upper assembly crossbeam in a circular shape; The lower part of the leveling trolley is equipped with wheels, and the trolley moves on the track through the wheels; a counterweight is fixed inside the leveling trolley; the leveling trolley is also provided with a brake for fixing the position of the leveling trolley on the track; The remote control box is used to control the movement of the leveling trolley along the track and the opening and closing of the brake; The device further comprises: two inclinometers; The two inclinometers are horizontally fixed on the upper component crossbeam, and the angle between the two inclinometers and the center line of the upper component crossbeam is 90 degrees.

2. The reactor upper assembly leveling device according to claim 1, characterized in that: A magnetic base is fixed at the lower ends of the two inclinometers and adsorbed on the crossbeam of the upper component.

3. The reactor upper assembly leveling device according to claim 1, characterized in that: The remote control box is also used to display the horizontal data of the two inclinometers.

4. The reactor upper assembly leveling device according to claim 1, characterized in that: The device further comprises: a manual turning device; The manual turning device is arranged on the leveling trolley and is used for manually driving the leveling trolley to move on the track.

5. The reactor upper assembly leveling device according to any one of claims 1 to 4, characterized in that: There are two tracks, and the two tracks are fixed on the crossbeam of the upper component in a concentric circle structure, and the centers of the two tracks coincide with the center of the upper component; The distance between the two rails matches the distance between the two wheels of the leveling trolley.

6. A method for leveling a reactor upper assembly, characterized in that: The reactor upper assembly leveling device according to any one of claims 1 to 5; the method comprising: When leveling the upper assembly of the reactor, the remote control box opens the brake and controls the leveling trolley to move along the track; When the horizontality of the reactor upper assembly meets the preset requirements, the remote control box controls the brake to close to fix the position of the leveling trolley.

Images