Method for installing main coolant pump of reactor

Abstract

The reactor main coolant pump installation method comprises the following steps that lifting devices are arranged on the two sides of a lower annular piece forming a reactor plant equipment gate; a transport vehicle set is used for loading the main pump and a transport support for supporting the main pump, and meanwhile a balance weight module is placed on the transport vehicle set; the transport vehicle set is in contact with the lifting device, penetrates through the gate and runs to a parking point below the hoisting opening; and hoisting the main pump by using the hoisting component, and relying on the performance of the transport vehicle set until the main pump is hoisted. The overturning method for the main coolant pump of the reactor can remarkably improve the transfer efficiency of the main pump.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of building construction, in particular to the field of main pump installation method. BACKGROUND

[0002] The reactor coolant pump, also known as the main pump, is a main equipment of the pressurized water reactor nuclear power plant which needs to be introduced into the nuclear island through the equipment gate, and needs to be used in the ring hoist to be turned over and erected on the temporary bridge, and finally hoisted into the chamber through the narrow hoisting opening to complete the installation.

[0003] Gou Rui et al. in "AP1000 Reactor Coolant Pump Plant Inner Transport Process Research" (China Nuclear Society. China Nuclear Science and Technology Progress Report (Volume 5) - China Nuclear Society 2017 Academic Year Conference Proceedings Volume 3 (Nuclear Power Subvolume), 2017: 139-144.) recorded three ways of rolling lever transport process, sliding transport process and hydraulic flat car transport process. In the hydraulic flat car transport process, two main pump transportation tracks are laid on the hydraulic flat car, the hydraulic flat car carries the main pump from the wharf to the plant parking position, travels along the docking center line, adjusts the position while traveling, adjusts the position for several times, ensures that the track on the hydraulic flat car is aligned with the temporary passage, and then moves the main pump to the turning position to prepare for turning and hoisting.

[0004] Chinese patent CN106816194A discloses a non-active advanced pressurized water reactor coolant pump installation process, which first provides a main pump temporary passage, which is assembled by H-shaped steel and steel plate, and is a special passage for introducing the main pump into the reactor plant (also known as the nuclear island plant); before the main pump is introduced into the reactor plant, the docking work of the flat car and the main pump temporary passage is completed to meet the corresponding gap requirements. After the docking is completed, the main pump and the transportation drag frame assembly are introduced into the nuclear island plant by using the traction rope, and then the main pump is turned over and erected.

[0005] However, the inventors found that the above-mentioned turning methods all need to install a temporary bridge in the equipment gate hoisting passage, use a Nicholas car group to cooperate with a tank and a traction device, and perform a turning construction by pulling and turning under the ring hoist, which completes the turning and erecting of the main pump at the equipment gate. This turning method not only often relies on the modification of the site environment, but also occupies the closed main passage, which seriously restricts the site construction. SUMMARY

[0006] An object of the present application is to provide a reactor coolant pump installation method which can significantly improve the main pump transport efficiency.

[0007] To achieve the above-mentioned purpose, the reactor coolant pump installation method comprises the following steps: Lifting devices are arranged on both sides of the lower ring-shaped part forming the reactor plant gate; The main pump and the transport frame supporting the main pump are loaded using a transport vehicle group, and a counterweight module is placed on the transport vehicle group. Make the transport vehicle group contact the lifting device, pass through the gate, and drive to the parking point below the hoisting port; The main pump is hoisted using hoisting equipment.

[0008] In one or more embodiments, after the transport vehicle group arrives at the parking point, jacks are used for auxiliary support under the vehicle group supporting the main pump.

[0009] In one or more embodiments, the transport vehicle is driven by its own drive unit to reverse-drive to the parking point.

[0010] In one or more embodiments, the hoisting component is connected to the main pump via a lifting device.

[0011] In one or more embodiments, the main pump and the spreader are connected as a whole and then loaded together on the transport vehicle.

[0012] In one or more embodiments, the main pump is fixed to the spreader on a transport bracket located at the rear end of the transport vehicle.

[0013] In one or more embodiments, the main pump and the lifting device extend beyond the tail end to form a suspended area.

[0014] In one or more embodiments, the position and weight of the counterweight module are adjusted in real time to keep the transport vehicle group balanced.

[0015] In one or more embodiments, the lifting speed of the hoisting component is controlled to be less than 0.5 m / min during the process of the main pump being tilted and erected.

[0016] In one or more embodiments, the position of the transport vehicle group is adjusted during the process of the main pump being tilted and erected, so that the transport vehicle group moves to the next parking point.

[0017] The above installation method eliminates the need for laying channels. The lifting device allows the transport vehicle to directly deliver the main pump into the nuclear island plant. During the tilting and hoisting of the main pump, the adjustment of the counterweight module on the vehicle ensures stable support for the main pump. This eliminates the need for traditional docking methods, optimizes the construction logic, and significantly shortens the construction period. Attached Figure Description

[0018] The above and other features, properties and advantages of the present invention will become more apparent from the following description taken in conjunction with the accompanying drawings and embodiments, wherein: Figure 1 This is a schematic diagram of the traditional main pump transportation process; Figure 2 This is an overhead view of the nuclear island plant. Figure 3 It is a top view of the transport vehicles passing through the gate; Figure 4 This is a schematic diagram of the lifting device at the gate; Figure 5 This is an overhead view of the transport crew entering the nuclear island plant; Figure 6 This is a schematic diagram of the main pump after it has been flipped. Figure 7 This is a schematic diagram of one embodiment of the lifting device; Figure 8 This is a schematic diagram of the transport vehicle assembly, main pump, and transport support frame; Figure 9 This is a front view of the transport vehicle assembly with the main pump mounted. Figure 10 This is a top view of the transport vehicle assembly with the main pump mounted on it. Figure 11 This is a flowchart of the reactor main coolant pump installation method. Detailed Implementation

[0019] The present invention will be further described below with reference to specific embodiments and accompanying drawings. More details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention can obviously be implemented in many other ways different from those described herein. Those skilled in the art can make similar extensions and derivations based on actual application situations without departing from the spirit of the present invention. Therefore, the scope of protection of the present invention should not be limited by the content of this specific embodiment.

[0020] It should be noted that these and other accompanying drawings are merely examples and are not drawn to scale, and should not be construed as limiting the scope of protection of the present invention.

[0021] Figure 1 The diagram illustrates the construction process of a conventional main pump 10. The main pump 10 needs to be introduced into the nuclear island building 12 through a gate 11, which is defined by an upper ring 111 and a lower ring 112. A flatbed truck 15 carries the transport support 16 and the main pump 10, and connects to the cable tray 13 laid inside the nuclear island building 12. A traction rope 14 is used to introduce the main pump into the nuclear island building 12. After the main pump 10 is lifted to an upright position using a hoisting component 17, it is pulled into the hoisting port 18.

[0022] Due to the small overall installation area, the process of connecting the main pump 10 with the temporary cable tray 13 and transferring it is easily restricted.

[0023] For example, the entrance gate 11 of the nuclear island plant 12 has a very limited height, only a few meters; the width of the hoisting opening 18 is also limited, the hoisting range is narrow, and the height difference between the hoisting opening 18 and the ground inside the nuclear island plant 12 is not large. The temporary cable trays further raise the ground, making the turning space of the main pump very limited. The nuclear island plant 12 also contains obstacles 19 such as columns. Figure 2 The top view shown limits the installation range of the cable tray 13, further restricting the operating range of the main pump 10. In this configuration, installing the main pump takes a very long time.

[0024] One reason why cable trays 13 are generally installed in factory buildings is that the gate 11 cannot withstand large forces. Figure 1 The upper ring 111 and lower ring 112 at the gate cannot directly withstand excessive force. Since the main pump is heavy, weighing tens to hundreds of tons, it would affect the gate if it directly contacts the gate 11 when passing through. Therefore, the cable tray can be raised by using structures such as H-beams 130 to create a gap between the lower ring 112 and the surface of the cable tray 13, thus preventing the main pump 10 from directly pressing down on the lower ring when passing through the gate.

[0025] However, the current method of using cable trays to transfer the main pump has delayed the construction progress. For example, during the installation of the main pump, the temporary cable trays were installed on site for up to 4 months, which restricted the gate and limited the time for hoisting and introducing steel structures and bulk materials. The prefabrication and installation of the cable trays need to be modified according to the site environment, and the ground conditions are also highly demanding, requiring the treatment of the ground elevation, which consumes a lot of manpower and material resources.

[0026] Based on this, this application provides a new method for installing the reactor main coolant pump, eliminating the need for traditional cable tray design.

[0027] The method includes the following steps: S1. Lifting devices 30 are installed on both sides of the lower annular component 112 that forms the reactor building gate; S2. The main pump 10 and the transport bracket 16 supporting the main pump are loaded using the transport vehicle 20, and a counterweight module 22 is placed on the transport vehicle 20. S3. Make the transport vehicle group contact the lifting device, pass through the gate, and drive to the parking point directly below the hoisting port. This parking point is the first parking point. S4. Use lifting components to lift the main pump, while adjusting the counterweight module to keep the transport vehicle group balanced until the main pump is lifted.

[0028] Step S1 (refer to) Figure 4As shown, the lifting device 30 includes support columns 31 located on the left and right sides of the lower ring member 112. The height of the support columns can be a floating structure. The top of the support column 31 is higher than the top of the lower ring member 112. When the transport vehicle group 20 passes through, it is lifted by the support column 31, keeping the universal wheels 21 of the vehicle group from contacting the lower ring member 112 and maintaining a gap, thereby avoiding the application of force to the gate.

[0029] It should be noted that, because the gap is small, approximately 10mm, therefore... Figure 4 and 6 The gap cannot be directly shown due to the limited scale.

[0030] This method eliminates the need for laying cable trays, significantly reducing the overall height of the transport vehicle 20 when carrying the main pump 10 through the gate. This reduces the probability of the main pump colliding with the gate, improves construction safety, and also reduces the time required to adjust the main pump's posture as it passes through.

[0031] To address the issue of limited space at the equipment gate, the height of the transport vehicle is adjustable, for example, within a range of 1200mm ± 200mm, to ensure smooth passage through the equipment gate while meeting the needs of transporting and tipping the main pump.

[0032] In some embodiments, the length of the transport vehicle group 20 is ≤12.5m, the width is ≤3.0m, the height of the flatbed 25 on the vehicle group is about 1.2m, and the flatbed 25 can be lowered to 0.9m. The length of the axle vehicle flatbed is ≥7.5m, and a rotating axle is set every 1.5m from the front of the vehicle in the forward direction, with a rotation angle ≥±20°. All wheels are swivel wheels, allowing the vehicle group to travel at any angle.

[0033] The transport vehicle group 20 has its own power supply 23 at the rear, and the power supply 23 does not need to pass through the gate.

[0034] If the main pump 10 is directly flipped on the flatbed truck, the movement of the main pump during the flipping process will cause a large fluctuation in weight, resulting in the center of gravity and height of the flatbed truck constantly changing and becoming unstable.

[0035] To address this issue, in step S2, sufficient space is provided on the transport vehicle group for placing the counterweight module 22. In some embodiments, the weight range of the counterweight module 22 is 20t to 50t, and the placement location can be at the front of the transport vehicle group or at other locations. By adjusting the position and weight of the counterweight module in real time, the weight changes of the transport vehicle group are balanced, thereby keeping the transport vehicle group in balance.

[0036] The span of the counterweight module 22 can exceed the width of the transport vehicle group to meet the balance requirements.

[0037] Subsequently, steps S3-S4 are performed to bring the transport vehicle group into contact with the lifting device, pass through the gate, and drive to the parking point below the hoisting port. The main pump 10 is hoisted using the hoisting component 17, while the counterweight module 22 is adjusted to keep the transport vehicle group balanced until the main pump is hoisted.

[0038] Specifically, the hoisting component 17 passes through Figure 7 The lifting device 50 shown is connected to the main pump 10. The lifting device 50 includes a pad 51, a universal rotating lug 52, a cross-shaped lifting beam 53, four lifting columns 54, and a connecting rod 55. After the end of the main pump 10 is connected to the lifting device 50, it engages with the main hook 170 of the lifting component 17, as shown. Figure 6 As shown.

[0039] During the process of rotating and erecting the main pump 10, the lifting speed of the hoisting components should be controlled to be less than 0.5 m / min.

[0040] During the process of the main pump 10 being tilted and erected, the position of the transport vehicle can be adjusted, and the parking point can be slightly moved to make it easier for the main pump 10 to be inserted into the hoisting port 18.

[0041] The construction process will be explained in detail below through a specific embodiment.

[0042] Firstly, as Figure 3 As shown, information such as the main pump tilting center point, the outer contour line of the transport vehicle, the main pump tilting center line A1, the hoisting port position A2, and the coordinate point of the hoisting port are measured. At the same time, the distance between the main pump transport vehicle and the steel structure is verified based on the data, and the placement position of the main pump 10 on the transport vehicle group 20 is determined.

[0043] In addition, based on the layout location, any interfering objects, such as scaffolding pipes and fire pipes, should be cleared in advance to ensure unobstructed passage and sufficient space for transportation and turnover.

[0044] Following this, an inspection process is conducted. During the storage of the main pump, a control area is established, and the fixed gantry, extension section, and hydraulic component covers are removed in advance using a warehouse crane. The equipment itself is then inspected, including main pump cleanliness checks, polarization index checks, main pump electrical tests, upper sealing ring measurements, surface inspections of the main pump heat shield, diffuser, upper sealing ring, stator shut-off ring, and main pump appearance inspection.

[0045] After the inspection is completed and the pump passes inspection, the lifting device 50 and the main pump 10 are pre-installed using a warehouse crane before the main pump is transported. After the lifting device is assembled, the diagonal of the flange bolt assembly is measured and compared with the actual position of the main pump bolt holes to ensure smooth installation of the lifting device.

[0046] In one specific embodiment, the transport vehicle group is selected from Wanshan vehicles, with 2 longitudinal columns and 6 axles. The crew members assemble, inspect, and test-run the vehicles to ensure they are in good working order and can operate normally. A 20t-50t counterweight module 22 is placed at the front end of the transport vehicle group 20 using a crane, adjusted according to the actual site conditions.

[0047] There must be no issue of the transport vehicle group being overloaded. Overloading specifically refers to a situation where the pressure is less than 280MPa.

[0048] After sealing the vehicle, the transport vehicle 20 travels to a position directly beneath the main pump 10 and carefully places the main pump, along with the lifting equipment, onto the transport support 16 on the transport vehicle. Figure 9 and Figure 10 As shown. After loading, the main pump and the end of the lifting device extend beyond the rear platform of the transport vehicle, with an overhang area A of approximately 154mm, which can be adjusted based on on-site measurements. Due to the excessive obstacles inside the factory, the main pump is positioned as deep within the factory as possible to allow for greater adjustment margins during hoisting in narrow openings.

[0049] According to the predetermined transportation route, the main pump was transported as a whole to location 12 of the nuclear island plant. Figure 3 and Figure 4 As shown, it is aligned with the lifting component 17 at the lifting port 18, namely the main hook 170 of the ring crane, so that the transport vehicle group can be parked for the first time.

[0050] The first parking point can be approximately 1005mm from the inner side of the lifting port 18 along the tilting line, with a vehicle height of 1100mm~1300mm. Simultaneously, tilting lifting slings are sequentially attached between the main hook 170 of the ring crane and the equipment body, and the connections are then inspected and completed.

[0051] Finally, the main pump was tilted and hoisted.

[0052] Lift the main hook 170 of the hoist to slightly raise the main pump 10 by about 100mm and hold it under static load for about 10 minutes. During this process, observe the hoist, slings, and equipment for any abnormalities. If any abnormalities are found, immediately report to the hoisting supervisor and stop the hoisting work.

[0053] After the trial lift, the main hook of the ring crane was slowly raised, and the transport vehicle moved forward approximately 4173mm along the tilting line to the next parking point, such as the second parking point. This achieved the effect of tilting and moving simultaneously, ensuring good coordination of the main pump during the lifting process. During the process, the height of the transport vehicle was slowly lowered by approximately 1100mm. Through the coordinated movement of the transport vehicle and the lifting of the main pump by the ring crane, the main pump simulator was successfully tilted and erected.

[0054] Preferably, during the journey, four sleepers are prepared and moved every 200mm along the route. That is, two sleepers are placed for the front wheels of the transport vehicle and two sleepers are placed for the rear wheels. The rear wheels need to be moved constantly to keep close to the rear wheels of the vehicle group.

[0055] To prevent the main pump from shifting position, after the transport vehicle arrives at the parking point, 50t screw jacks can be used to support the rear of the transport vehicle on both sides. Alternatively, wedge shims or sleepers can be used to secure the front and rear wheels of the transport vehicle.

[0056] The above method has the following advantages: (1) The main pump is directly delivered into the factory by the transport vehicle group and flipped directly on the transport vehicle group. It can also achieve the effect of the main pump flipping while the transport vehicle group is moving. The traditional special channel is eliminated and a lifting device is used to avoid direct contact between the vehicle group and the lower ring under the gate, ensuring that the gate does not bear the weight. This greatly improves the time required for the installation of the main pump and shortens the construction period. (2) Using counterweight modules in conjunction with the suspended area makes the main pump easy to lift while ensuring the stability of the transport vehicle group during the lifting process.

[0057] Compared to traditional methods, this direct flipping process can effectively reduce the input of manpower and materials during construction, reduce the prefabrication, installation and dismantling of temporary cable trays, not only reduce labor intensity, but also significantly shorten the construction cycle, and has strong flexibility and practicality.

[0058] It should be noted that the use of terms such as "first" and "second" to define the components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this application.

[0059] Furthermore, this application uses specific terms to describe embodiments of the application. For example, "an embodiment," "one embodiment," and / or "some embodiments" refer to a particular feature, structure, or characteristic related to at least one embodiment of the application. Therefore, it should be emphasized and noted that "an embodiment," "one embodiment," or "an alternative embodiment" mentioned twice or more in different locations in this specification do not necessarily refer to the same embodiment. In addition, certain features, structures, or characteristics in one or more embodiments of the application can be appropriately combined.

[0060] While the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the invention. Any variations and modifications can be made by those skilled in the art without departing from the spirit and scope of the invention. Therefore, any modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention, without departing from the scope of the invention, fall within the protection scope defined by the claims of the present invention.

Claims

1. A method for installing a reactor main coolant pump, characterized in that, Includes the following steps: Lifting devices are installed on both sides of the lower annular component that forms the reactor building gate; The main pump and the transport frame supporting the main pump are loaded using a transport vehicle group, and a counterweight module is placed on the transport vehicle group. Make the transport vehicle group contact the lifting device, pass through the gate, and drive to the parking point below the hoisting port; The main pump is hoisted using hoisting equipment.

2. The installation method as described in claim 1, characterized in that, After the transport vehicle group arrives at the parking point, jacks are used to provide auxiliary support under the vehicle group supporting the main pump.

3. The installation method as described in claim 1, characterized in that, The transport vehicle is driven by its own drive unit to reverse and move to the parking point.

4. The installation method as described in claim 1, characterized in that, The hoisting component is connected to the main pump via a lifting device.

5. The installation method as described in claim 4, characterized in that, After the main pump and the lifting device are connected as a whole, they are loaded together on the transport vehicle.

6. The installation method as described in claim 5, characterized in that, The main pump and the lifting device are fixed on the transport bracket, which is located at the rear end of the transport vehicle group.

7. The installation method as described in claim 6, characterized in that, The main pump and the lifting device are extended beyond the tail end to form a suspended area.

8. The installation method as described in claim 1, characterized in that, The position and weight of the counterweight module are adjusted in real time to keep the transport vehicle group balanced.

9. The installation method as described in claim 1, characterized in that, During the process of the main pump being tilted and erected, the lifting speed of the hoisting component is controlled to be less than 0.5 m / min.

10. The installation method as described in claim 1, characterized in that, During the process of the main pump being tilted and erected, the position of the transport vehicle group is adjusted so that the transport vehicle group can move to the next parking point.

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