Reactor core fuel assembly transfer device of nuclear reactor and transfer trolley of reactor core fuel assembly transfer device

Abstract

The reactor core fuel assembly transfer device comprises the reactor core fuel assembly transfer trolley, the reactor core fuel assembly transfer trolley comprises a trolley body, walking wheels and guide wheels, the walking wheels and the guide wheels are arranged on the trolley body, and the trolley body comprises a bottom plate, a rear side wall, a front side wall, a left side wall and a right side wall. The vehicle body is connected with a driving mechanism, and one end, far away from the driving mechanism, of the bottom plate is provided with a hole for a loader to turn over and pass through; the travelling wheels and the guide wheels are respectively mounted on the left side wall and the right side wall; the reactor core fuel assembly transfer trolley realizes cross-rail travelling along the transfer rail through the travelling wheels and the guide wheels; the left side wall and the right side wall of the vehicle body are concentrically provided with hinge holes used for being connected with a loader respectively. No power alternation, no clamping stagnation and no power failure risk exist in the whole working process, and the transfer efficiency and safety are improved.

Description

Technical Field

[0001] This invention relates to nuclear power plant core fuel assembly refueling technology, and in particular to a core fuel assembly transfer device and its transfer trolley suitable for pressurized water reactor nuclear power plants. Background Technology

[0002] Nuclear power generation, as a clean energy source that does not produce greenhouse gases, is receiving increasing attention. Pressurized water reactor nuclear power plants, as a typical representative of nuclear power generation technology, have high power generation efficiency and fuel utilization rate, reducing energy waste, and are therefore widely used.

[0003] During the operation of a pressurized water reactor (PWR) nuclear power plant, the fuel assemblies in the reactor core continuously burn and are converted into spent fuel assemblies. To ensure the normal operation of the nuclear power plant, it is necessary to periodically shut down the reactor and replace the fuel assemblies. The reactor core is located in the reactor building (RX side), while the fuel assemblies to be installed and the spent fuel assemblies removed from the core are stored in the fuel building (KX side). The reactor building and the fuel building are isolated by a thick containment wall. The fuel assembly transfer device, as a key piece of equipment for replacing fuel assemblies during nuclear power plant shutdowns, is mainly used to transfer fuel assemblies between the reactor building and the fuel building, playing a vital role in the refueling process of a PWR nuclear power plant.

[0004] Currently, most pressurized water reactor nuclear power plants use transport trolleys that run on the RX-side track, KX-side track, and transfer channel. A drive mechanism is installed on both the reactor building side and the fuel building side. Gears on these two drive mechanisms relay the rack on the transport trolley, completing the task of transporting fuel assemblies from the reactor building to the fuel building via the transfer channel. There is one tilting frame on each side, one on the reactor building and one on the fuel building, respectively bolted to the RX-side track and the KX-side track. Once the carrier is in place with the transport trolley, the tilting frame tilts the carrier. The carrier tilts to a vertical position, and the fuel assembly is vertically loaded into the carrier from the top. However, the fuel assembly transfer device uses gears on two sets of drive mechanisms installed in the reactor building and the fuel building to drive the rack on the transport trolley, thus completing the transfer of fuel assemblies between the reactor building (RX side) and the fuel building (KX side). This transmission method has high requirements for the machining and assembly accuracy of the guide rails and racks, resulting in high cost of the transfer device, complex control program, risk of jamming of the transport trolley, and low reliability. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a reactor core fuel assembly transfer device and its transfer trolley, which addresses the above-mentioned deficiencies of the prior art.

[0006] To achieve the above objectives, this utility model provides a core fuel assembly transfer trolley for a nuclear reactor, comprising a vehicle body and traveling wheels and guide wheels mounted on the vehicle body. The vehicle body includes a base plate, a rear side wall, a front side wall, a left side wall, and a right side wall. The vehicle body is connected to a drive mechanism. The end of the base plate away from the drive mechanism has a hole for the carrier to flip and pass through. The traveling wheels and guide wheels are respectively mounted on the left side wall and the right side wall, and the vehicle body travels across the transfer track via the traveling wheels and guide wheels. The left side wall and the right side wall of the vehicle body are respectively provided with concentric hinge holes for connecting the carrier.

[0007] The aforementioned nuclear reactor core fuel assembly transfer trolley includes a transfer track comprising a bottom surface, a side surface, and an open top surface. The traveling wheels are supported on the bottom surface, the guide wheels contact the side surface and roll along the side surface for guidance, and the core fuel assembly transfer trolley is engaged within the top surface to prevent accidental derailment.

[0008] In the aforementioned nuclear reactor core fuel assembly transfer trolley, the bottom surface is a shared support surface for the core fuel assembly transfer trolley and the rigid chain, and the bottom surface is provided with a rigid chain guide groove along its length for auxiliary guidance of the rigid chain.

[0009] The aforementioned nuclear reactor core fuel assembly transfer trolley, wherein the hinge hole corresponds to the hole located at the front of the trolley body.

[0010] The aforementioned nuclear reactor core fuel assembly transfer trolley, wherein the drive mechanism is a rigid pusher structure, including a drive component and a transmission component. The drive component includes a motor, a reducer, and a first drive shaft. The reducer is connected to both the motor and the first drive shaft. The motor and reducer are located at the edge of the spent fuel pool. The transmission component is installed on the side wall of the spent fuel pool via a quick-installation mechanism and is connected to the trolley body.

[0011] The aforementioned nuclear reactor core fuel assembly transfer trolley includes a transmission component comprising a chain magazine, a rigid chain, and a second drive shaft. The rigid chain is installed within the chain magazine. One end of the second drive shaft is connected to the first drive shaft via a quick connector, and the other end of the second drive shaft is connected to the rigid chain via a steering gear. The rigid chain is connected to the vehicle body.

[0012] The aforementioned nuclear reactor core fuel assembly transfer trolley, wherein the rigid chain in the chain library is a single chain with a structure in the middle or a double chain with a structure on both sides.

[0013] The aforementioned nuclear reactor core fuel assembly transfer trolley, wherein the rigid chain is connected to the trolley body via a quick-connect structure, and long-pole tools are used to achieve long-distance assembly and disassembly.

[0014] The aforementioned nuclear reactor core fuel assembly transfer trolley, wherein the drive component further includes an emergency handwheel connected to the first drive shaft.

[0015] To better achieve the above objectives, this utility model also provides a core fuel assembly transfer device for a nuclear reactor, which includes the aforementioned core fuel assembly transfer trolley.

[0016] The beneficial effects of this utility model are as follows:

[0017] This invention relates to a reactor core fuel assembly transfer trolley capable of traveling on transfer tracks (including KX-side straight tracks, RX-side straight tracks, and an inner track), cooperating with the carrier to complete the transfer of fuel assemblies. The trolley is driven by a rigid push-pull structure, such as a rigid chain. This drive structure has lower requirements for track machining and debugging precision, effectively reducing manufacturing, assembly, debugging, and maintenance costs. Furthermore, the trolley operates without power alternation, eliminating the risk of jamming or power failure, thus improving transfer efficiency and safety.

[0018] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments, but this is not intended to limit the present invention. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of a reactor core fuel assembly transfer device according to an embodiment of the present invention;

[0020] Figure 2 This is a schematic diagram of the core fuel assembly transfer trolley structure according to an embodiment of the present invention;

[0021] Figure 3 for Figure 2 Top view;

[0022] Figure 4 This is a schematic diagram of the mounting carrier installed on the reactor core fuel assembly transfer trolley according to an embodiment of the present invention;

[0023] Figure 5 This is a side view of the KX side straight track according to an embodiment of the present invention;

[0024] Figure 6 This is a schematic diagram of the drive mechanism structure according to an embodiment of the present invention.

[0025] Among them, the attached reference numerals

[0026] 1. Core fuel assembly transfer trolley

[0027] 11. Vehicle body

[0028] 111 base plate

[0029] 1111 holes

[0030] 112 Rear sidewall

[0031] 113 Anterior sidewall

[0032] 114 Left side wall

[0033] 115 Right side wall

[0034] 12 walking wheels

[0035] 13 guide wheels

[0036] 14 Hinge holes

[0037] 2. Carrier

[0038] 3. Drive mechanism

[0039] 31 Drive components

[0040] 311 motor

[0041] 312 speed reducer

[0042] 313 First drive shaft

[0043] 314 Emergency Handwheel

[0044] 32 Transmission components

[0045] 321 Chain Library

[0046] 322 Rigid Chain

[0047] 323 Second drive shaft

[0048] 33 Quick Connectors

[0049] 34 Quick Installation Mechanism

[0050] 4 KX side transfer track

[0051] 41 KX Side Straight Track

[0052] 411 Bottom

[0053] 412 Side View

[0054] 413 Top surface

[0055] 414 Rigid Chain Guide Groove

[0056] 42 KX Side-Tilting Track

[0057] 5. Transfer Channel

[0058] 51 Inner Track

[0059] 6 RX side transfer track

[0060] 61 RX Side Straight Rail

[0061] 62 RX Side-flip track

[0062] 7 Blind flange

[0063] 8. Manual gate valve Detailed Implementation

[0064] The structural and working principles of the present invention will be described in detail below with reference to the accompanying drawings:

[0065] See Figure 1 , Figure 1This is a schematic diagram of a core fuel assembly transfer device according to an embodiment of the present invention. The core fuel assembly transfer device of the present invention is suitable for the transfer of core fuel assemblies in pressurized water reactor nuclear power plants. It includes a core fuel assembly transfer trolley 1, a carrier 2, a drive mechanism 3, a KX-side transfer track 4 (including a KX-side straight track 41 and a KX-side flip track 42), and a transfer channel 5. The transfer channel 5 is provided with an inner track 51 and an RX-side transfer track 6 (including an RX-side straight track 61 and an RX-side flip track 62). The drive mechanism 3, the KX-side straight track 41, and the KX-side tilting track 42 are installed in the spent fuel pool of the fuel building, while the RX-side straight track 61 and the RX-side tilting track 62 are installed in the refueling pool of the reactor building. The transfer channel 5 runs through the containment wall between the fuel building and the reactor building, and the inner track 51 is installed inside the transfer channel 5. The core fuel assembly transfer trolley 1 can travel on the KX-side straight track 41, the RX-side straight track 61, and the inner track 51 to complete the transfer of fuel assemblies. The drive mechanism 3 provides power to the core fuel assembly transfer trolley 1. The carrier 2 is hinged to the core fuel assembly transfer trolley 1 and can be tilted around the hinge axis. The KX-side tilting track 42 enables the carrier 2 to tilt in both horizontal and vertical positions within the fuel building. The RX-side tilting track 62 enables the carrier 2 to tilt in both horizontal and vertical positions within the reactor building. It may also include a blind flange 7 and a manual gate valve 8. The blind flange 7 is installed at the port of the transfer channel 5 on the refueling pool side of the reactor building, and the manual gate valve 8 is installed at the other port of the transfer channel 5 on the spent fuel pool side. After the core fuel assembly replacement is completed, the manual gate valve 8 is closed to drain the water from the refueling pool in the reactor building, and the blind flange 7 is installed to seal the transfer channel 5. The composition, structure, relative positions, connection relationships, and functions of other parts of this core fuel assembly transfer device can all adopt relatively mature existing technologies, so they will not be described in detail here. The following only describes the core fuel assembly transfer trolley 1 of this utility model in detail.

[0066] See Figures 2-4 , Figure 2 This is a schematic diagram of the core fuel assembly transfer trolley 1 according to an embodiment of the present invention. Figure 3 for Figure 2 Top view, Figure 4This is a schematic diagram of the installation of a carrier 2 on a core fuel assembly transfer trolley 1 according to an embodiment of the present invention. The core fuel assembly transfer trolley 1 of the present invention includes a body 11 and running wheels 12 and guide wheels 13 mounted on the body 11. The body 11 is a rectangular cavity structure with an open upper section, including a bottom plate 111, a rear side wall 112, a front side wall 113, a left side wall 114, and a right side wall 115. One end of the body 11 is connected to a drive mechanism 3. The end of the bottom plate 111 away from the drive mechanism 3 has a hole 1111 for the carrier to rotate and pass through. Multiple running wheels 12 and guide wheels 13 are respectively mounted on... On the left side wall 114 and right side wall 115, the core fuel assembly transfer trolley 1 travels across discontinuous transfer tracks via the traveling wheels 12 and guide wheels 13. The number of traveling wheels 12 and guide wheels 13 installed on the left side wall 114 and right side wall 115 can be adjusted according to actual needs to adapt to different working environments and track configurations. The left side wall 114 and right side wall 115 of the trolley body 11 are respectively concentrically provided with hinge holes 14 for connecting the carrier 2. The hinge shaft of the carrier 2 passes through the hinge holes 14, such as... Figure 4 As shown, the carrier 2 can rotate around the hinge axis. The hinge hole 14 corresponds to the hole 1111 located at the front of the vehicle body 11.

[0067] See Figure 5 , Figure 5 This is a side view of a KX-side straight track according to an embodiment of the present invention. Taking the KX-side straight track as an example, the transfer track in this embodiment includes a bottom surface 411, a side surface 412, and an open top surface 413. The traveling wheels 12 are supported on the bottom surface 411, providing support for the core fuel assembly transfer trolley 1 and enabling the core fuel assembly transfer trolley 1 to travel on the transfer track (including the KX-side straight track 41, the RX-side straight track 61, and the inner track 51). The guide wheels 13 contact the side surface 412 and roll along the side surface 412, providing left and right guidance for the core fuel assembly transfer trolley 1. The core fuel assembly transfer trolley 1 is engaged within the top surface 413 to prevent accidental derailment. The bottom surface 411 is a shared support surface for the core fuel assembly transfer trolley 1 and the rigid chain 322. The bottom surface 411 is provided with a rigid chain guide groove 414 along its length for auxiliary guidance of the rigid chain 322. This transfer track enables the core fuel assembly transfer trolley 1 and rigid chain 322 to share a common track, simplifying the track structure and reducing manufacturing costs.

[0068] See Figure 6 , Figure 6This is a schematic diagram of the drive mechanism 3 according to an embodiment of the present invention. The drive mechanism 33 in this embodiment can be a rigid pusher chain structure, a steel cable structure, or a gear and rack structure, etc., as long as it can realize the pushing and pulling action of the core fuel assembly transfer trolley 1. Its specific form is not limited. Preferably, it is a rigid pusher chain structure, which can be installed and fixed on the side wall of the spent fuel pool to provide power for the core fuel assembly transfer trolley 1. It adopts a modular structure, including a drive component 31 and a transmission component 32, which are divided into upper and lower parts. After the upper and lower parts are separated, they can be lifted out of the spent fuel pool as a whole, which is convenient for maintenance. The upper drive component 31 includes a motor 311, a reducer 312, and a first drive shaft 313. The reducer 312 is connected to both the motor 311 and the first drive shaft 313. The motor 311 and the reducer 312 are bolted together and installed on the side of the spent fuel pool. The lower transmission component 32 is installed on the side wall of the spent fuel pool via a quick-installation mechanism 34. The transmission component 32 includes a chain magazine 321, a rigid chain 322, and a second drive shaft 323. The rigid chain 322 is installed inside the chain magazine 321. One end of the second drive shaft 323 is connected to the first drive shaft 313 via a quick connector 33, and the other end of the second drive shaft 323 is connected to the rigid chain 322 via a steering mechanism. The rigid chain 322 inside the chain magazine 321 can be a single chain with a central arrangement or a double chain arrangement with both sides. A single chain arrangement in the middle is preferred due to its simplicity and avoidance of cumulative error issues associated with double chains. The rigid chain 322 is connected to the core fuel assembly transfer trolley 1 via a quick-connect structure and can be disassembled and assembled remotely using a long-handled tool. The drive component 31 may also include an emergency handwheel 314 connected to the first drive shaft 313. In the event of a failure in the motor 311 or control system, the emergency handwheel 314 can be used to pull the core fuel assembly transfer trolley 1 back to the spent fuel pool for reset. The drive component 31 is installed above the water surface of the spent fuel pool, while the underwater component 32 is a purely mechanical transmission component, ensuring high reliability.

[0069] The reactor core fuel assembly transfer trolley 1 of this invention can travel on transfer tracks (including the KX-side straight track 41, the RX-side straight track 61, and the inner track 51) and cooperate with the carrier to complete the transfer task of the fuel assembly. The drive of the reactor core fuel assembly transfer trolley 1 is realized by a rigid push-pull structure such as a rigid chain. This drive structure has low requirements for the processing and debugging accuracy of the track, thereby effectively reducing the processing and manufacturing cost, assembly and debugging cost, and operation and maintenance cost. Moreover, there is no power alternation in the entire working process of the reactor core fuel assembly transfer trolley 1, eliminating the risk of jamming and power failure, thus improving the transfer efficiency and safety.

[0070] Of course, there may be other embodiments of this utility model. Without departing from the spirit and essence of this utility model, those skilled in the art can make various corresponding changes and modifications based on this utility model, but these corresponding changes and modifications should all fall within the protection scope of the appended claims of this utility model.

Claims

1. A core fuel assembly transfer trolley for a nuclear reactor, characterized in that, The vehicle includes a body and traveling wheels and guide wheels mounted on the body. The body includes a base plate, a rear side wall, a front side wall, a left side wall, and a right side wall. The body is connected to a drive mechanism. The end of the base plate away from the drive mechanism has a hole for the carrier to flip and pass through. The traveling wheels and guide wheels are respectively mounted on the left side wall and the right side wall. The body travels across the transfer track via the traveling wheels and guide wheels. The left side wall and the right side wall of the body are respectively provided with concentric hinge holes for connecting the carrier.

2. The reactor core fuel assembly transfer trolley as described in claim 1, characterized in that, The transfer track includes a bottom surface, a side surface, and an open top surface. The traveling wheels are supported on the bottom surface, the guide wheels contact the side surface and roll along the side surface to provide guidance, and the core fuel assembly transfer trolley is engaged in the top surface to prevent accidental derailment.

3. The reactor core fuel assembly transfer trolley as described in claim 2, characterized in that, The bottom surface is a shared support surface for the core fuel assembly transfer trolley and the rigid chain, and the bottom surface is provided with a rigid chain guide groove along the length direction for auxiliary guidance of the rigid chain.

4. The reactor core fuel assembly transfer trolley as described in claim 1, characterized in that, The hinge hole corresponds to the hole located at the front of the vehicle body.

5. The reactor core fuel assembly transfer trolley as described in claim 1, characterized in that, The drive mechanism is a rigid push chain structure, including a drive component and a transmission component. The drive component includes a motor, a reducer, and a first drive shaft. The reducer is connected to both the motor and the first drive shaft. The motor and reducer are located beside the spent fuel water tank. The transmission component is installed on the side wall of the spent fuel water tank via a quick-installation mechanism and is connected to the vehicle body.

6. The reactor core fuel assembly transfer trolley as described in claim 5, characterized in that, The transmission component includes a chain magazine, a rigid chain, and a second drive shaft. The rigid chain is installed in the chain magazine. One end of the second drive shaft is connected to the first drive shaft via a quick connector, and the other end of the second drive shaft is connected to the rigid chain via a steering gear. The rigid chain is connected to the vehicle body.

7. The reactor core fuel assembly transfer trolley as described in claim 6, characterized in that, The rigid chain in the chain library is either a single chain with a structure in the middle or a double chain with a structure on both sides.

8. The reactor core fuel assembly transfer trolley as described in claim 6, characterized in that, The rigid chain is connected to the vehicle body via a quick-release structure and can be disassembled and assembled remotely using a long-handled tool.

9. The reactor core fuel assembly transfer trolley as described in claim 6, characterized in that, The drive component also includes an emergency handwheel, which is connected to the first drive shaft.

10. A reactor core fuel assembly transfer device, characterized in that, Includes the reactor core fuel assembly transfer trolley as described in any one of claims 1-9.

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