A simulation test platform for tightening the flange nuts of the upper assembly of a nuclear reactor

Abstract

The present invention belongs to the technical field of nuclear power plant reactor maintenance, and specifically relates to a nuclear reactor upper component pipe flange nut tightening simulation test platform, which is provided with an upper component upper plate simulation part and an upper component pipe simulation flange, and can enable tightening equipment to perform tightening debugging, testing, calibration, training and other functions on the simulation test platform, thereby ensuring that the functional parameters of the tightening equipment and the operating skills of the personnel meet the use requirements before the reactor overhaul.

Description

Technical Field

[0001] The present application belongs to the technical field of nuclear power plant reactor maintenance, and in particular relates to a simulation test platform for tightening nuts on a take-over flange of an upper assembly of a nuclear reactor. Background Art

[0002] The upper reactor assembly of a nuclear power unit has a total of 139 flanges, including 121 control rod drive mechanism pressure hull flanges and 18 neutron temperature measurement channel flanges. Each flange joint has 6 bolts and nuts for connecting and sealing the pressure hull and neutron temperature measurement channel flanges. When reinstalling the pressure hull, the vertical adjustment of 103 pressure hulls needs to be considered simultaneously.

[0003] At present, during all the reactor overhauls of a certain nuclear power plant unit, manual tightening and adjustment of the pressure shell are carried out. The removal of the pressure shell nuts and the adjustment of the torque and verticality when reinstalling them require high skills and physical strength of the personnel. In addition, if the verticality of the pressure shell does not meet the requirements, the pressure shell needs to be removed and resealed. According to statistics, the average time for removing the pressure shell nuts of a single unit during the overhaul is 14 hours, and the average collective dose is 4.655mSv. The average time for adjusting the torque and verticality of the pressure shell when reinstalling it is 66.5 hours, and the average collective dose is 22.112mSv. In addition, special manual tools are required to remove the nuts and operate the torque. The labor intensity of the maintenance staff is high, the construction period is relatively long, and the proportion of the collective dose is also large.

[0004] In addition, the main line refueling work and in-service inspection schedule are being continuously optimized, which also poses a severe challenge to the overall maintenance schedule of the reactor upper components. The total maintenance schedule of the reactor upper components must be continuously shortened to avoid the secondary critical path currently occupied by the upper component maintenance from being transformed into the main line critical path of the overhaul.

[0005] Therefore, according to the maintenance needs of the upper group components of the reactor, the nuclear power plant currently uses tightening equipment to tighten the flange nuts of the pipe. After using this tightening equipment, the average time for adjusting the torque and verticality of the pressure hull reinstallation is expected to be 13.7 hours, and the average collective dose is 2.6mSv. It can also reduce the operating errors caused by the overhaul workers when adjusting the verticality of the pressure hull, and avoid the probability of rework, damage to the pressure hull, and damage to the flange of the top cover pipe due to unqualified verticality adjustment of the pressure hull.

[0006] In order to ensure that the tightening equipment can perform its functions normally during the overhaul of the nuclear power plant reactor, sufficient simulation training should be carried out for the equipment operators. It is necessary to maintain, debug, calibrate and test the equipment before the overhaul begins. Summary of the invention

[0007] The purpose of the present application is to provide a nuclear reactor upper component pipe flange nut tightening simulation test platform to solve the problem that the tightening equipment must be fully simulated and trained for equipment operators so that it can normally perform its functions during the overhaul of the nuclear power plant reactor.

[0008] Technical solution to achieve the purpose of this application:

[0009] The embodiment of the present application provides a nuclear reactor upper assembly pipe flange nut tightening simulation test platform, the simulation test platform comprising: a platform bracket, an upper assembly upper plate simulation part and an upper assembly bottom simulation part;

[0010] The upper assembly upper plate simulation member and the upper assembly bottom simulation member are fixed to the upper end and the lower end of the platform bracket respectively;

[0011] The upper plate simulation member of the upper assembly is provided with a first mounting hole for mounting a tightening device;

[0012] An upper component pipe simulation flange is fixed on the upper component bottom simulation part, and the upper component pipe simulation flange is concentrically aligned with the first mounting hole so that the tightening device can perform tightening operations using the upper component pipe simulation flange.

[0013] Optional,

[0014] A temporary storage device is fixed on the bottom simulation part of the upper assembly, which is used to temporarily store the tightening equipment or the pressure-resistant shell;

[0015] A storage hole is also provided on the upper plate simulation member of the upper component, and the storage hole is concentrically aligned with the temporary storage device.

[0016] Optionally, the temporary storage device comprises: a temporary fixing device for the pressure hull and a temporary fixing device for the tightening equipment;

[0017] The pressure hull temporary fixing device is fixed on the bottom simulation part of the upper assembly and is used for temporarily storing the pressure hull;

[0018] The temporary fixing device for tightening equipment is sleeved on the temporary fixing device for the pressure-resistant shell and is used for temporary storage of the tightening equipment.

[0019] Optionally, the upper assembly bottom simulation part includes: a bottom plate and a flange fixing plate;

[0020] One side of the bottom plate is fixed to the platform bracket, and the other side of the bottom plate is fixed to one side of the flange fixing plate;

[0021] The upper component pipe simulation flange and the temporary storage device are fixed to the other side of the flange fixing plate.

[0022] Optional,

[0023] One side of the bottom plate is connected to the platform bracket via a bow-shaped pressure plate.

[0024] Optional,

[0025] A level is installed on the bottom simulation part of the upper component.

[0026] Optional,

[0027] The upper assembly upper plate simulation part is also provided with a second mounting hole for mounting an auxiliary insert of the tightening device.

[0028] Optionally, the platform support includes four columns and an equipment inspection operating table arranged on the top of the four columns;

[0029] The upper plate simulation part of the upper assembly is fixed on the equipment verification platform;

[0030] The bottoms of the four columns are provided with adjustable legs and universal wheels.

[0031] Optionally, the column is provided with an anti-tilt bracket extending out of the column.

[0032] Optional,

[0033] The equipment verification platform is paved with anti-skid steel plates.

[0034] Optionally, the platform support further includes a ladder for personnel to climb onto the equipment inspection platform;

[0035] A detachable guard cage is arranged on the upper part of the ladder.

[0036] Optional,

[0037] An equipment storage box fixing device is arranged on two adjacent columns, and is used for fixing an equipment storage box for storing the tightening equipment.

[0038] Optional,

[0039] The periphery of the equipment inspection operating table is provided with a detachable fence.

[0040] The beneficial technical effects of this application are:

[0041] (1) The embodiment of the present application provides a nuclear reactor upper assembly pipe flange nut tightening simulation test platform, the equipment storage box can be fixed on the simulation test platform, and has anti-tilt measures. The equipment storage box is fixed on the simulation test platform, which effectively solves the problem of having nowhere to store the equipment storage box;

[0042] (2) The embodiment of the present application provides a nuclear reactor upper assembly pipe flange nut tightening simulation test platform, which is provided with an upper assembly upper plate simulation part and an upper assembly pipe simulation flange, so that the tightening equipment can perform tightening debugging, testing, calibration, training and other functions on the simulation test platform, ensuring that the functional parameters of the tightening equipment and the operating skills of the personnel meet the use requirements before the reactor overhaul;

[0043] (3) A nuclear reactor upper assembly flange nut tightening simulation test platform provided in an embodiment of the present application has a temporary storage position for a pressure vessel and tightening equipment on the simulation test platform, which is used for temporarily storing the tightening equipment and the pressure vessel on the test platform. One position has multiple uses, which effectively saves the platform space and improves the efficiency of tightening debugging and testing.

[0044] (4) The embodiment of the present application provides a nuclear reactor upper assembly pipe flange nut tightening simulation test platform, in which adjustable legs and a level are provided on the platform support, and the levelness of the platform support can be judged according to the state of the level, and adjusted through the adjustable legs, thereby realizing the adjustable levelness function of the platform support, and the on-site use effect is good;

[0045] (5) The embodiment of the present application provides a nuclear reactor upper assembly flange nut tightening simulation test platform, which integrates the functions of equipment box storage, tightening equipment simulation test, calibration, and temporary equipment storage, thereby reducing the workload of cranes and lifting personnel and improving on-site work efficiency;

[0046] (6) The embodiment of the present application provides a nuclear reactor upper component flange nut tightening simulation test platform, which is provided with a removable guard cage, guardrail and universal wheels. When the platform is idle, the upper fence and guard cage can be removed, the bottom legs can be loosened, and the platform can be pushed into a height-restricted factory building for storage using the universal wheels. The on-site use effect is good, and the test platform can be moved at any time on the same plane as needed. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 A schematic diagram of the structure of a nuclear reactor upper assembly flange nut tightening simulation test platform provided in an embodiment of the present application;

[0048] Figure 2 A top view of an upper assembly upper plate simulation part in a nuclear reactor upper assembly pipe flange nut tightening simulation test platform provided in an embodiment of the present application;

[0049] Figure 3 A top view of a simulation part of the bottom of an upper assembly in a simulation test platform for tightening a flange nut of an upper assembly of a nuclear reactor provided in an embodiment of the present application;

[0050] Figure 4 A cross-sectional view of a simulation part at the bottom of an upper assembly in a simulation test platform for tightening a nut on a flange of an upper assembly of a nuclear reactor provided in an embodiment of the present application;

[0051] Figure 5 A schematic structural diagram of a platform bracket in a nuclear reactor upper assembly flange nut tightening simulation test platform provided in an embodiment of the present application.

[0052] In the figure:

[0053] 1- platform support; 11- column; 12- equipment inspection operation table; 13- adjustable legs; 14- universal wheels; 15- anti-tilt support; 16- ladder; 17- cage; 18- equipment storage box fixing device;

[0054] 19- Fence;

[0055] 2-upper assembly upper plate simulation part; 21-first mounting hole; 22-storage hole; 23-second mounting hole;

[0056] 3- Upper component bottom simulation part; 31- Upper component pipe simulation flange; 32- Temporary storage device;

[0057] 33-temporary fixing device for pressure hull; 34-temporary fixing device for tightening equipment; 35-bottom plate; 36-flange fixing plate; 37-level gauge;

[0058] 4- Tighten the equipment;

[0059] 5- Equipment storage box. DETAILED DESCRIPTION

[0060] 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.

[0061] At present, the inventors of this application have found in their research that in order to ensure that the tightening equipment can normally perform its functions during the overhaul of the nuclear power plant reactor, the equipment operators are fully trained in simulation. The main problems are as follows:

[0062] (1) When using the equipment, the equipment storage box must be placed in a vertical position first, and then the tightening equipment must be lifted out of the storage box for use. The equipment storage box is up to 6 meters long, and there is no suitable place to fix it after it is placed vertically;

[0063] (2) There is no simulation test bench in the power station that matches the equipment, and the temporary test bench cannot meet the requirements of storing the pressure hull and tightening equipment at the same time;

[0064] (3) The plant space in the power station is limited and there is no suitable fixed location for the test bench to be purchased;

[0065] (4) The tightening equipment has high requirements on the rigidity and levelness of the test bench. The temporary platform structure is not strong enough and cannot meet the requirements.

[0066] In response to the above problems, an embodiment of the present application provides a nuclear reactor upper component flange nut tightening simulation test platform, which successfully solves the problem that the power station cannot carry out equipment debugging, inspection, testing, and training work due to the lack of a test bench, and ensures that the various functions and parameters of the equipment meet the use requirements before the overhaul begins.

[0067] Based on the above content, in order to clearly and in detail illustrate the above advantages of the present application, the specific implementation methods of the present application will be described below in conjunction with the accompanying drawings.

[0068] See also Figure 1 , which is a structural schematic diagram of a nuclear reactor upper component flange nut tightening simulation test platform provided in an embodiment of the present application.

[0069] The embodiment of the present application provides a nuclear reactor upper assembly pipe flange nut tightening simulation test platform, comprising: a platform bracket 1, an upper assembly upper plate simulation part 2 and an upper assembly bottom simulation part 3;

[0070] The upper assembly upper plate simulation member 2 and the upper assembly bottom simulation member 3 are fixed to the upper end and the lower end of the platform bracket 1 respectively;

[0071] A first mounting hole 21 is provided on the upper assembly upper plate simulation member 2 for mounting a tightening device 4, such as Figure 2 As shown;

[0072] like Figure 3 and Figure 4 As shown, an upper component pipe simulation flange 31 is fixed on the upper component bottom simulation part 3, and the upper component pipe simulation flange 31 is concentrically aligned with the first mounting hole 21, so that the tightening device 4 uses the upper component pipe simulation flange 31 to perform tightening operations.

[0073] In some possible implementations of the present application, such as Figure 3 and Figure 4 As shown, a temporary storage device 32 is fixed on the bottom simulation member 3 of the upper assembly, which is used to temporarily store the tightening device 4 or the pressure-resistant shell;

[0074] like Figure 2As shown, a storage hole 22 is also provided on the upper plate simulation member 2 of the upper assembly, and the storage hole 22 is concentrically aligned with the temporary storage device 32 .

[0075] In some possible implementations of the present application, such as Figure 3 and Figure 4 As shown, the temporary storage device 32 includes: a temporary fixing device 33 for the pressure hull and a temporary fixing device 34 for the tightening equipment;

[0076] The pressure hull temporary fixing device 33 is fixed on the upper assembly bottom simulation member 32 and is used for temporarily storing the pressure hull;

[0077] The tightening equipment temporary fixing device 34 is sleeved on the pressure-resistant shell temporary fixing device 33 and is used for temporary storage of the tightening equipment 4 .

[0078] In some possible implementations of the present application, such as Figure 4 As shown, the upper assembly bottom simulation part 3 includes: a bottom plate 35 and a flange fixing plate 36;

[0079] One side of the bottom plate 35 is fixed to the platform bracket 1, and the other side of the bottom plate 35 is fixed to one side of the flange fixing plate 36;

[0080] The upper component pipe dummy flange 31 and the temporary storage device 32 are fixed to the other side of the flange fixing plate 36 .

[0081] In practical applications, one side of the bottom plate 36 can be connected to the platform bracket 1 through an arch-shaped pressure plate. When it is necessary to adjust the concentric alignment of the upper component pipe simulation flange 31 and the first mounting hole 21 of the upper component upper plate simulation part 2, the arch-shaped pressure plate can be loosened for adjustment. The flange fixing plate 36 and the bottom plate 35 are connected by bolts.

[0082] In some possible implementations of the present application, such as Figure 3 and Figure 4 As shown, a level 37 is installed on the upper assembly bottom simulation member 3, which is used to observe the level of the platform support 1 when leveling. In practical applications, the level 37 can be embedded on the flange fixing plate 36.

[0083] In some possible implementations of the present application, such as Figure 2 As shown, a second mounting hole 23 is also provided on the upper assembly upper plate simulation part 2 for mounting an auxiliary insert of the tightening device 4 .

[0084] See also Figure 5 , which is a structural schematic diagram of a platform bracket in a nuclear reactor upper component flange nut tightening simulation test platform provided in an embodiment of the present application.

[0085] In some possible implementations of the embodiments of the present application, the platform support 1 may specifically include four columns 11 and an equipment inspection operation table 12 disposed on the top of the four columns 11;

[0086] The upper assembly upper plate simulation part 2 is fixed on the equipment verification platform 12 to facilitate the operation of the operator;

[0087] The bottom of the four columns 11 is provided with adjustable legs 13 and universal wheels 14, and the level of the simulation test platform for tightening the flange nuts of the upper assembly of a nuclear reactor provided in the embodiment of the present application can be adjusted by the adjustable legs 13. Specifically, the simulation test platform can be supported by the adjustable legs 13 in the working state, and the level of the entire simulation test platform can be adjusted by adjusting the height of the legs 13; the simulation test platform can be supported by the universal wheels 14 in the transport state, so that the simulation test platform can be moved horizontally on the ground.

[0088] In the specific implementation, the platform bracket 1 can be specifically composed of welded channel steels, and diagonal braces are added between the crossbeams and columns of the platform bracket 1, which can effectively prevent the deformation of the platform bracket 1 from affecting the verticality of the pressure hull when the tightening equipment 4 is working. The overall strength of the platform bracket 1 can meet the requirements of 10 people working on the platform at the same time.

[0089] In practical applications, the upper assembly upper plate simulation part 2 and the equipment verification platform 12 can be positioned by positioning pins and connected using bolts.

[0090] In one example, the equipment inspection platform 12 is paved with anti-skid steel plates to effectively prevent workers from falling. In another example, a detachable fence 19 is provided around the equipment inspection operating table 12 .

[0091] In a specific implementation, the fence 19 can be connected to the equipment verification operating table 12 by bolts, and the fence 19 can be removed when the simulation test platform is hoisted or stored idle.

[0092] In some possible implementations of the embodiments of the present application, the platform support 1 further includes a ladder 16 for personnel to climb onto the equipment inspection platform;

[0093] A detachable guard cage 17 is provided on the upper portion of the ladder 16 .

[0094] In a specific implementation, the ladder 16 and the platform bracket 1 can be connected by bolts.

[0095] It is understandable that when the simulation test platform is idle, the fence 19 and the cage 17 can be removed, the adjustable legs 13 at the bottom can be loosened, and the simulation test platform can be pushed into a factory building with limited height for storage using the universal wheels 14, which can effectively save space in the production plant.

[0096] In some possible implementations of the embodiments of the present application, an equipment storage box fixing device 18 is provided on two adjacent columns 11 for fixing the equipment storage box 5 for storing the tightening equipment 4, thereby effectively solving the problem of having nowhere to store the equipment storage box 5.

[0097] In some possible implementations of the embodiments of the present application, an anti-tilt bracket 15 extending out of the column 11 is provided on the column 11 , which can effectively prevent the equipment storage box 5 from tipping over when it is fixed on the platform bracket 1 .

[0098] The following is a detailed description of a method for using a nuclear reactor upper assembly flange nut tightening simulation test platform provided in an embodiment of the present application, with reference to a specific example.

[0099] The method for using a nuclear reactor upper assembly flange nut tightening simulation test platform provided in an embodiment of the present application can be specifically as follows:

[0100] Step 1: hoist or push the simulation test platform to a work site with a flat ground, and install the upper fence 19;

[0101] Step 2: By observing the level 37, adjust the adjustable legs 13 so that all the universal wheels 14 leave the ground, and adjust the level until the test requirements are met, and open all the anti-tilt brackets 15;

[0102] Step 3: Adjust the upper component pipe simulation flange 31 and the first mounting hole 21 on the upper component upper plate simulation part 2 to be concentrically aligned by adjusting the bottom plate 35;

[0103] Step 4: Flip the equipment storage box 5 from a horizontal state to a vertical state, and fix it using the equipment storage box fixing device 18 on the platform bracket 1;

[0104] Step 5: Install the pressure shell flange and its fastening nut on the upper component pipe simulation flange 31 and prepare for tightening;

[0105] Step 6: The operator uses the equipment verification operation table 12 to verify the tightening device 4 in the equipment storage box 5. After the verification is qualified, the tightening device 4 is lifted out of the equipment storage box 5, installed in the first installation hole 21 on the upper assembly upper plate simulation part 2, and connected with the pressure shell flange nut installed on the upper assembly pipe simulation flange 31;

[0106] Step 7: The operator stands on the equipment verification operation table 12 to perform tightening simulation tests, training, etc.;

[0107] Step 8: After the test is completed, use a crane to lift the tightening device 4 out of the first mounting hole 21 on the upper assembly upper plate simulation member 2 and place it in the storage hole 22 for temporary storage; or lift the tightening device 4 into the equipment storage box 5 for storage, remove the tightening device temporary fixing device 34, and lift the pressure hull into the storage hole 22 for temporary storage;

[0108] Step 9: After all the tests and training work is completed, the tightening equipment 4 is hoisted into the equipment storage box 5 for storage, and the equipment storage box 5 is hoisted to a fixed storage location; the upper fence 19 and the cage 17 of the ladder 16 are removed, and the anti-tilt bracket 15 is retracted. Finally, the simulation test platform is hoisted or pushed to a fixed storage location.

[0109] A nuclear reactor upper component pipe flange nut tightening simulation test platform provided in an embodiment of the present application integrates multiple functions such as testing, verification, debugging, and training, and fully considers the convenience and safety of use, greatly improves the efficiency of the upper component pipe flange nut tightening simulation test, saves space in the production plant, can be promoted and applied in test-related work of similar equipment, and can be extended to related work in power plants or other similar industries. It also has good reference significance for simulation tests of similar equipment in the same industry and other industries.

[0110] 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 nuclear reactor upper assembly flange nut tightening simulation test platform, characterized in that: The simulation test platform comprises: a platform support, an upper component upper plate simulation part and an upper component bottom simulation part; The upper assembly upper plate simulation member and the upper assembly bottom simulation member are fixed to the upper end and the lower end of the platform bracket respectively; The upper plate simulation member of the upper assembly is provided with a first mounting hole for mounting a tightening device; An upper component pipe simulation flange is fixed on the upper component bottom simulation part, and the upper component pipe simulation flange is concentrically aligned with the first mounting hole, so that the tightening device uses the upper component pipe simulation flange to perform a tightening operation; A temporary storage device is fixed on the bottom simulation part of the upper assembly, which is used to temporarily store the tightening equipment or the pressure-resistant shell; The upper plate simulation member of the upper assembly is also provided with a storage hole, and the storage hole is concentrically aligned with the temporary storage device; The platform support comprises four columns and an equipment inspection operating table arranged on the upper parts of the four columns; The upper plate simulation part of the upper assembly is fixed on the equipment verification operating table; The bottoms of the four columns are provided with adjustable legs and universal wheels; An equipment storage box fixing device is arranged on two adjacent columns, and is used for fixing an equipment storage box for storing the tightening equipment.

2. The nuclear reactor upper assembly flange nut tightening simulation test platform according to claim 1, characterized in that: The temporary storage device comprises: a temporary fixing device for the pressure hull and a temporary fixing device for the tightening equipment; The pressure hull temporary fixing device is fixed on the bottom simulation part of the upper assembly and is used for temporarily storing the pressure hull; The temporary fixing device for tightening equipment is sleeved on the temporary fixing device for the pressure-resistant shell and is used for temporary storage of the tightening equipment.

3. The nuclear reactor upper assembly flange nut tightening simulation test platform according to claim 1, characterized in that: The upper assembly bottom simulation part includes: a bottom plate and a flange fixing plate; One side of the bottom plate is fixed to the platform bracket, and the other side of the bottom plate is fixed to one side of the flange fixing plate; The upper component pipe simulation flange and the temporary storage device are fixed to the other side of the flange fixing plate.

4. The nuclear reactor upper assembly flange nut tightening simulation test platform according to claim 3, characterized in that: One side of the bottom plate is connected to the platform bracket via a bow-shaped pressure plate.

5. The nuclear reactor upper assembly flange nut tightening simulation test platform according to claim 1, characterized in that: A level is installed on the bottom simulation part of the upper component.

6. The nuclear reactor upper assembly flange nut tightening simulation test platform according to claim 1, characterized in that: The upper assembly upper plate simulation part is also provided with a second mounting hole for mounting an auxiliary insert of the tightening device.

7. The nuclear reactor upper assembly flange nut tightening simulation test platform according to claim 1, characterized in that: The column is provided with an anti-tilt bracket extending out of the column.

8. The nuclear reactor upper assembly flange nut tightening simulation test platform according to claim 1, characterized in that: The equipment inspection operating table is paved with anti-skid steel plates.

9. The nuclear reactor upper assembly flange nut tightening simulation test platform according to claim 1, characterized in that: The platform support also includes a ladder for personnel to climb onto the equipment inspection operating platform; A detachable guard cage is arranged on the upper part of the ladder.

10. The nuclear reactor upper assembly flange nut tightening simulation test platform according to claim 1, characterized in that: A detachable fence is arranged on the periphery of the equipment inspection operating table.

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