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

Abstract

The utility model relates to a reactor core fuel assembly transfer device of a nuclear reactor and a transfer track thereof, the transfer device comprises a transfer track, the transfer track comprises a KX side transfer track, a KX side straight track and a KX side turnover track, the KX side straight track is located in a spent fuel pool of a fuel plant; the KX side overturning track is arranged above the KX side straight track so as to realize overturning of the loader; the RX side transfer track comprises an RX side straight track and an RX side turnover track, and the RX side straight track is located in a refueling pool of a reactor building; the RX side overturning track is arranged above the RX side straight track so as to realize overturning of the loader; the transfer channel is installed in a containment wall between the fuel plant and the reactor plant in a penetrating mode, an inner rail is installed in the transfer channel, and the two ends of the inner rail are arranged corresponding to the KX side straight rail and the RX side straight rail respectively; and the rail transfer mechanism is mounted at the bottom of the RX side straight rail corresponding to the RX side turnover rail, and is matched with the transfer trolley to realize high-low switching of the inlet position of the RX side turnover rail.

Description

Technical Field

[0001] This utility model relates to nuclear power plant core fuel assembly refueling technology, and in particular to a core fuel assembly transfer device and its transfer track 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 fuel assembly transfer devices with one drive mechanism on the reactor building side and one on the fuel building side. The gears on the two drive mechanisms relay the rack on the transport trolley to complete the task of transporting fuel assemblies from the reactor building to the fuel building via the transfer channel. There is one tilting frame on the reactor building and one on the fuel building, respectively bolted to the RX side rail and the KX side rail. When the carrier in the trolley moves into place with the transport trolley, the tilting frame tilts the carrier to complete the transfer of fuel assemblies. The transfer of fuel assemblies between the reactor building (RX side) and the fuel building (KX side) is achieved by using gears on two sets of drive mechanisms installed in the reactor building and the fuel building to relay the rack on the transport trolley. This transmission method requires high precision in the machining and assembly of the guide rails and racks, resulting in high cost of the transfer device, complex control program, risk of the transport trolley jamming, and low reliability. In addition, two sets of tilting frames need to be installed in the reactor building and the fuel building respectively, equipped with corresponding motors and transmission mechanisms to drive steel cables to complete the tilting operation of the carrier, which leads to high cost of the transfer device. Furthermore, due to the need for coordination of multiple control units, the control program is complex, and the system is difficult to maintain and operate. Utility Model Content

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

[0006] To achieve the above objectives, this utility model provides a transfer track for the core fuel assembly of a nuclear reactor, comprising:

[0007] The KX-side transfer track includes a KX-side straight track and a KX-side tilting track. The KX-side straight track is located inside the spent fuel pool of the fuel plant. The KX-side tilting track is located above the KX-side straight track.

[0008] The RX-side transfer track includes an RX-side straight track and an RX-side tilting track. The RX-side straight track is located in the refueling pool of the reactor building. The RX-side tilting track is located above the RX-side straight track and close to the fuel building.

[0009] A transfer channel runs through the containment wall between the fuel building and the reactor building. An inner track is installed within the transfer channel, with its two ends corresponding to the KX-side straight track and the RX-side straight track, respectively.

[0010] The track-changing mechanism is installed at the bottom of the RX-side straight track, corresponding to the RX-side flip track, and works with the transfer trolley to switch the height of the RX-side flip track entrance position.

[0011] The aforementioned transfer track for the core fuel assembly of the nuclear reactor includes, respectively, the KX-side straight track and the RX-side straight track comprising: a straight rail, multiple supports, and adjusting feet for adjusting the height and level of the straight rail. The straight rail is mounted and supported on the multiple supports, and the adjusting feet are respectively provided at the bottom end of each support.

[0012] The aforementioned transfer track for the core fuel assembly of the nuclear reactor includes a limit baffle at the end of the straight track on the KX side and a connecting plate at the end of the straight track on the RX side.

[0013] The aforementioned transfer track for the core fuel assembly of a nuclear reactor includes a straight track and an inner track, both of which have a bottom surface, a side surface, and an open top surface. The bottom surface is provided with a rigid chain guide groove. The bottom surface is a shared support surface for the transfer trolley and the rigid chain. The side surface is a guide surface for the transfer trolley. The top surface prevents the transfer trolley from accidentally derailing.

[0014] The aforementioned transfer track for the core fuel assembly of the nuclear reactor includes a KX-side flipping track comprising a KX-side fixed frame and a KX-side arc-shaped rail. The KX-side fixed frame is symmetrically installed on both sides of the KX-side straight rail via adjustable feet. The KX-side arc-shaped rails on both sides are respectively connected to the KX-side fixed frame on the same side. The spacing of the KX-side arc-shaped rails is adapted to the carrier. The guide wheels on both sides of the carrier run along the tracks of the KX-side arc-shaped rails, thereby realizing the flipping of the carrier in vertical and horizontal positions.

[0015] The aforementioned transfer track for the core fuel assembly of the nuclear reactor includes KX-side arc-shaped rails connected to corresponding KX-side fixing frames via connecting columns; the KX-side arc-shaped rails are symmetrically arranged and connected at the top via connecting beams.

[0016] The aforementioned transfer track for the reactor core fuel assembly of a nuclear reactor includes an RX-side flipping track comprising an RX-side fixed frame and an RX-side arc-shaped rail. The RX-side fixed frame is symmetrically installed on both sides of the RX-side straight rail via adjustable feet. The spacing of the RX-side arc-shaped rail is adapted to the carrier. The RX-side arc-shaped rail comprises a fixed rail and a swing rail. The fixed rail is installed on the RX-side fixed frame. The end of the fixed rail is connected to the top of the swing rail. A support positioning block is installed at the bottom of the end of the swing rail. A support positioning part is provided on the RX-side straight rail corresponding to the support positioning block. The track-changing mechanism is installed at the bottom of the RX-side straight rail corresponding to the support positioning block. The track-changing mechanism drives and controls the swing rail to switch between a descending position and a rising position via the transfer trolley. When the swing rail is in the descending position, the guide wheels on both sides of the carrier run along the track of the RX-side arc-shaped rail through the guide openings of the swing rail, realizing the flipping of the carrier between the vertical and horizontal positions.

[0017] The aforementioned transfer track for the core fuel assembly of the nuclear reactor includes an upper limit beam and / or a lower limit beam on the side of the RX-side fixture closest to the KX-side building. The two ends of the upper limit beam and the lower limit beam are respectively connected to the corresponding RX-side fixture.

[0018] The aforementioned transfer track for the core fuel assembly of the nuclear reactor includes a fixed track connected to a corresponding RX-side mounting bracket via an RX-side connecting column; the fixed tracks are symmetrically arranged and connected at the top via RX-side connecting beams.

[0019] To better achieve the above objectives, this utility model also provides a reactor core fuel assembly transfer device, which includes the aforementioned transfer track.

[0020] The technical advantages of this utility model are as follows:

[0021] This utility model's transfer track, through the setup of a KX-side transfer track (including a KX-side straight track and a KX-side tilting track), a transfer channel, an RX-side transfer track (including an RX-side straight track and an RX-side tilting track), and a track-changing mechanism, requires only one drive mechanism to rotate the transfer trolley in conjunction with the carrier to complete the tilting of the carrier, thereby realizing the transfer of fuel assemblies. It eliminates the need to install two separate tilting frames in the reactor building and fuel building, simplifying the corresponding motors and transmission mechanisms, and reducing the machining accuracy, assembly accuracy, and maintenance costs of the guide rails. Furthermore, the tilting control is achieved through a mechanical structure, which is simple and reliable. The transport trolley operates on this transfer track without the risk of jamming, ensuring high reliability. Simultaneously, it effectively reduces the manufacturing and maintenance costs and control difficulty of transfer devices using this transfer track, making operation simple, safe, and reliable.

[0022] 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

[0023] Figure 1 This is a schematic diagram of the structure of a fuel assembly transfer device according to an embodiment of the present invention;

[0024] Figure 2 This is a schematic diagram of the KX side straight track structure according to an embodiment of the present invention;

[0025] Figure 3 This is a side view of the KX side straight track according to an embodiment of the present invention;

[0026] Figure 4 This is a schematic diagram of the RX side straight track structure according to an embodiment of the present invention;

[0027] Figure 5 This is a schematic diagram of the KX side-flipping track structure according to an embodiment of the present invention;

[0028] Figure 6 This is a schematic diagram of the RX-side flip track structure according to an embodiment of the present invention;

[0029] Figure 7A This is a schematic diagram of the installation position of the track-changing mechanism according to an embodiment of the present invention;

[0030] Figure 7B for Figure 7A A magnified view of a portion of the image.

[0031] Among them, the attached reference numerals

[0032] 1 transfer cart

[0033] 2 carriers

[0034] 3 Push-pull drive mechanism

[0035] 4 transfer tracks

[0036] 41KX side transfer track

[0037] 411KX Side Straight Rail

[0038] 4111KX Side Straight Rail

[0039] 41111 Bottom

[0040] 41112 Side View

[0041] 41113 Top surface

[0042] 41114 Rigid Chain Guide Groove

[0043] 4112KX Side Bracket

[0044] 4113KX Side Adjustable Feet

[0045] 4114 Limiting baffle

[0046] 412KX Side-Tilting Track

[0047] 4121KX Side Curved Rail

[0048] 4122 Fixture

[0049] 4123 connecting column

[0050] 4124 reinforced leg

[0051] 4125 connecting beam

[0052] 4126KX Side-tilt Adjustable Feet

[0053] 42 transfer channels

[0054] 421 Inner Track

[0055] 43RX side transfer track

[0056] 431RX Side Straight Rail

[0057] 4311RX Side Straight Rail

[0058] 4312 connecting board

[0059] 4313 Support Positioning Unit

[0060] 4314RX Side Adjustable Feet

[0061] 4315RX Side Bracket

[0062] 432RX Side-flipping Rail

[0063] 4321RX Side Curved Rail

[0064] 43211 Fixed Rail

[0065] 43212 Swing Rail

[0066] 4322 Support Positioning Block

[0067] 4323RX Side Mount

[0068] 43231 Upper limit beam

[0069] 43232 Lower limit beam

[0070] 4324RX Side-flipping feet

[0071] 4325RX side connecting column

[0072] 4326RX Side Reinforced Legs

[0073] 4327RX side connecting beam

[0074] 44 Track Changing Mechanism

[0075] 5 blind flange

[0076] 6 manual gate valves Detailed Implementation

[0077] The structural and working principles of this utility model will be described in detail below with reference to the accompanying drawings:

[0078] See Figure 1 , Figure 1This is a schematic diagram of a fuel assembly transfer device according to an embodiment of the present invention. The fuel assembly transfer device of the present invention is suitable for fuel assembly transfer in pressurized water reactor nuclear power plants, and includes a transfer trolley 1, a carrier 2, a push-pull drive mechanism 3, a KX-side transfer track 41 (including a KX-side straight track 411 and a KX-side flip track 412), a transfer channel 42, and an inner track 421, an RX-side transfer track 43 (including an RX-side straight track 431 and an RX-side flip track 432), and a track-changing mechanism 44. The push-pull drive mechanism 3, the KX-side straight track 411, and the KX-side tilting track 412 are installed in the spent fuel pool of the fuel building, while the RX-side straight track 431 and the RX-side tilting track 432 are installed in the refueling pool of the reactor building. The transfer channel 42 is installed through the containment wall between the fuel building and the reactor building. The inner track 421 is installed inside the transfer channel 42. In this embodiment, the cross-sectional structure of the inner track 421 is consistent with that of the KX-side straight track 411, and both ends are provided with easily guided flared openings to prevent the transfer trolley 1 from getting stuck when crossing tracks. (Track changing...) Mechanism 44 is installed at the bottom of the RX side straight track 431; the transfer trolley 1 travels back and forth on the KX side straight track 411, the RX side straight track 431 and the inner track 421 to complete the transfer of fuel assemblies; the push-pull drive mechanism 3 provides power to the transfer trolley 1; the carrier 2 is hinged to the transfer trolley 1 and can rotate around the hinge axis; the KX side flip track 412 enables the carrier 2 to rotate between horizontal and vertical states in the fuel building; the RX side flip track 432 enables the carrier 2 to rotate between horizontal and vertical states in the reactor building.

[0079] This embodiment may also include a blind flange 5 and a manual gate valve 6. The blind flange 5 is installed at the port of the transfer channel 42 on the reactor building refueling pool side, and the manual gate valve 6 is installed at the other port of the transfer channel 42 on the spent fuel pool side. After the core fuel assembly replacement is completed, the manual gate valve 6 is closed to drain the water from the reactor building refueling pool, and the blind flange 5 is installed to seal the transfer channel 42.

[0080] In this embodiment, the transfer track 4 includes: a KX-side transfer track 41, comprising a KX-side straight track 411 and a KX-side flipping track 412, wherein the KX-side straight track 411 is located in the spent fuel pool of the fuel building; the KX-side flipping track 412 is disposed above the KX-side straight track 411 and is used to cooperate with the transfer trolley 1 to achieve the vertical and horizontal flipping of the carrier 2; an RX-side transfer track 43, comprising an RX-side straight track 431 and an RX-side flipping track 432, wherein the RX-side straight track 431 is located in the refueling pool of the reactor building; the RX-side flipping track 432 is disposed above the RX-side straight track 431 and is used to cooperate with the transfer trolley 1 to achieve the vertical and horizontal flipping of the carrier 2; and a transfer channel 42, which is installed through the containment wall between the fuel building and the reactor building, wherein an inner track 421 is installed inside the transfer channel 42, and the two ends of the inner track 421 correspond to the KX-side straight track 411 and the KX-side flipping track 412, respectively. Track 411 and RX-side straight track 431 are provided to enable the transfer trolley 1 to move smoothly across the tracks; and a track-changing mechanism 44 is installed at the bottom of the RX-side flip track 432 corresponding to the bottom of the RX-side straight track 431, which is used to cooperate with the transfer trolley 1 to switch the height of the entrance position of the RX-side flip track 432; the bottom of the transfer trolley 1 is provided with a contact block for driving the track-changing mechanism 44; wherein, the driving mechanism is a push-pull driving mechanism 3, which is connected to the transfer trolley 1 and drives the transfer trolley 1 to move along the KX-side straight track 411, the inner track 421 and the RX-side straight track 431; one end of the carrier 2 is hinged to the transfer trolley 1 and rotates with the hinge axis as the center. The transfer trolley 1 drives the carrier 2 to switch between horizontal and vertical positions in the fuel plant and the reactor plant respectively through the KX-side flip track 412 and the RX-side flip track 432 to complete the transfer of fuel assemblies.

[0081] See Figures 2-5 , Figure 2 This is a schematic diagram of the KX side straight track 411 structure according to an embodiment of the present invention. Figure 3 This is a side view of the KX side straight track 411 according to an embodiment of the present invention. Figure 4 This is a schematic diagram of the RX side straight track 431 structure according to an embodiment of the present invention. Figure 5This is a schematic diagram of the RX side straight track 431 from a bottom view according to an embodiment of the present invention. The KX side straight track 411 of the present invention is located in the spent fuel pool of the fuel building and is used for the storage and movement guidance of the transfer trolley 1; the RX side straight track 431 is located in the refueling pool of the reactor building and is used to support the transfer trolley 1 and serve as the running track of the transfer trolley 1. The KX-side straight track 411 and RX-side straight track 431 in this embodiment each include: a straight track, multiple supports (including KX-side support 4112 and RX-side support 4315), and adjustable feet (including KX-side adjustable feet 4113 and RX-side adjustable feet 4314). The straight track is mounted and supported on the multiple supports to ensure the stability and load-bearing capacity of the track. The adjustable feet are symmetrically arranged at the bottom of each support. The adjustable feet are welded and fixed to the stainless steel bottom surface of the spent fuel water tank. The adjustable feet are used to adjust the height and level of the straight track. By adjusting the adjustable feet, the KX-side straight track 411 and the inner track 421 are kept within a specified height deviation range, so that the transfer trolley 1 can travel smoothly across the two tracks, that is, to ensure that the transfer trolley 1 can travel smoothly across the KX-side straight track 411, the inner track 421, and the RX-side straight track 431. The connection between the straight rail and the inner rail 421 is provided with a flared guide opening to effectively prevent the transfer trolley 1 from getting stuck when it crosses the rail; the end of the straight rail 4111 on the KX side is provided with a limit baffle 4114, and the end of the straight rail 4311 on the RX side is provided with a connecting plate 4312 to prevent the transfer trolley 1 from accidentally leaving the rail.

[0082] The RX-side straight track 431 in this embodiment is similar in structure to the KX-side straight track 411. The difference is that one end of the RX-side straight track 431 is a funnel shape that is easy to guide, and the other end is connected by a connecting plate 4312. The connecting plate 4312 can prevent the transfer trolley 1 from accidentally leaving the track. The RX-side adjusting foot 4314 is welded and fixed to the stainless steel bottom surface of the reactor building refueling pool.

[0083] The straight rail has the same structure as the inner rail. Taking the KX side straight rail 4111 as an example, it includes a bottom surface 41111, a side surface 41112, and an open top surface 41113. The bottom surface 41111 has a rigid chain guide groove 41114 along its length for auxiliary guidance of the rigid chain 322. The bottom surface 41111 is a shared support surface for the transfer trolley 1 and the rigid chain 322. The side surface 41112 is a guide surface for the transfer trolley 1. The top surface 41113 is used to prevent the transfer trolley 1 from derailing accidentally. The KX side straight rail 4111 achieves a shared rail for the transfer trolley 1 and the rigid chain 322, simplifying the rail structure and reducing manufacturing costs.

[0084] See Figure 5 , Figure 5This is a schematic diagram of the KX-side flip track 412 according to an embodiment of the present invention. In this embodiment, the KX-side flip track 412 includes a KX-side fixing frame 4122 and a KX-side arc-shaped rail 4121. The KX-side fixing frame 4122 is symmetrically installed on both sides of the KX-side straight rail 411 by adjusting feet. The KX-side arc-shaped rails 4121 on both sides are respectively connected to the KX-side fixing frame 4122 on the same side. The two symmetrically arranged KX-side arc-shaped rails 4121 are connected to each other by connecting beams 4125 to enhance the overall rigidity of the KX-side flip track 4122. The spacing between the KX-side arc-shaped rails 4121 on both sides is adapted to the carrier 2. The traveling guide wheels 1323 on both sides of the carrier 2 run along the tracks of the KX-side arc-shaped rails 4121 to realize the flipping of the carrier 2 in the vertical and horizontal positions. A flared guide structure is provided at one end of the KX-side curved rail 4121 adjacent to the KX-side straight rail 411 to guide the guide wheel of the carrier 2 to smoothly switch between the KX-side curved rail 4121 and the KX-side straight rail 411. The KX-side fixing frame 4122 can be a triangular fixing frame, a rectangular fixing frame, an L-shaped fixing frame, or a groove-shaped fixing frame, preferably a triangular fixing frame, which can be adjusted according to actual needs to adapt to different working environments. The KX-side curved rail 4121 is connected to the two KX-side fixing frames 4122 through the connecting column 4123, increasing the distance between the two KX-side fixing frames 4122 and providing sufficient space for the offset loading of the fuel assembly. The KX side mounting bracket 4122 is connected to the side wall of the spent fuel water tank using reinforcing legs 4124. The reinforcing legs 4124 are welded and fixed to the stainless steel side wall of the spent fuel water tank. The reinforcing legs 4124 have an adjustable length, allowing them to be adjusted to suit different installation requirements. The KX side mounting bracket 4122 is connected to the bottom surface of the spent fuel water tank using KX side tilting adjustable feet 4126. The KX side tilting adjustable feet 4126 are welded and fixed to the stainless steel bottom surface of the spent fuel water tank. The KX side tilting adjustable feet 4126 have a height adjustable function, allowing the height of the KX side tilting track 412 to be adjusted.

[0085] See Figures 6-7B , Figure 6 This is a schematic diagram of the RX-side flip track 432 structure according to an embodiment of the present invention. Figure 7A This is a schematic diagram showing the installation position of the track-changing mechanism 44 according to an embodiment of the present invention. Figure 7B for Figure 7AA partial enlarged view. The RX-side flip track 432 is located on the reactor building side. The RX-side flip track 432 is structurally similar to the KX-side flip track 412. The difference is that the RX-side arc track 4321 can swing. A contact block is set at the bottom of the transfer trolley 1 to trigger the track changing mechanism 44 to make the swing track 43212 of the RX-side arc track 4321 rise or fall, thereby changing the height position of the opening end of the swing track 43212 in the RX-side arc track 4321. The RX-side tilting track 432 in this embodiment includes an RX-side fixing frame 4323 and an RX-side arc-shaped rail 4321. The RX-side fixing frame 4323 is symmetrically installed on both sides of the RX-side straight rail 431 via RX-side tilting feet 4324. The spacing between the two sides of the RX-side arc-shaped rails 4321 is adapted to the carrier 2. An upper limit beam 43231 and a lower limit beam 43232 are provided on the side of the RX-side fixing frame 4323 closest to the KX-side factory building to achieve mechanical positioning of the carrier in the vertical state of the RX-side factory building. The two ends of the upper limit beam 43231 and the lower limit beam 43232 are respectively connected to the corresponding side of the RX-side fixing frame 4323, and can be arranged parallel to the lower part of the RX-side fixing frame 4323, spanning the RX-side straight rail 431 and located above the RX-side straight rail 431. In this embodiment, the RX-side fixing bracket 4323 is preferably a right-angled triangular bracket structure. The upper limit beam 43231 and the lower limit beam 43232 are arranged parallel to each other on the lower part of one side of the vertical right-angle side of the triangular bracket. Alternatively, only the upper limit beam 43231 or the lower limit beam 43232 can be provided, and they are located above the RX-side straight track 431. The RX-side arc-shaped track 4321 includes a fixed track 43211 and a swing track 43212. The fixed track 43211 is installed on the RX-side fixing bracket 4323. The two symmetrically arranged fixed tracks 43211 are connected to each other by the RX-side connecting beam 4327 to enhance the overall rigidity of the RX-side flip track 4322. The fixed track 43211 of the RX-side arc-shaped track 4321 is connected to the two RX-side fixing brackets 4323 by the RX-side connecting column 4325, which increases the distance between the two RX-side fixing brackets 4323 and provides sufficient space for the offset loading of the fuel assembly. The RX-side fixing bracket 4323 is connected to the side wall of the refill tank using RX-side reinforcing legs 4326. The RX-side reinforcing legs 4326 are welded and fixed to the stainless steel side wall of the refill tank. The RX-side reinforcing legs 4326 have an adjustable length, allowing them to be adjusted to suit different installation requirements. The RX-side fixing bracket 4323 is connected to the bottom surface of the refill tank using RX-side tilting feet 4324. The RX-side tilting feet 4324 are welded and fixed to the stainless steel bottom surface of the refill tank. The RX-side tilting feet 4324 have an adjustable height, allowing the height of the RX-side tilting track 432 to be adjusted.The end of the fixed rail 43211 is hinged to the upper end of the swing rail 43212, and the swing rail 43212 can swing around the hinge axis. The interface between the fixed rail 43211 and the swing rail 43212 is far from the position where the guide wheel bears the maximum pressure during the flipping of the carrier 2. A support positioning block 4322 is installed at the bottom of the end of the swing rail 43212, and a support positioning part 4316 is provided on the RX side straight rail 4311 corresponding to the support positioning block 4322. The track changing mechanism 44 is installed at the bottom of the RX side straight rail 4311 corresponding to the support positioning block 4322, and the swing rail 43212 can be raised and lowered through the track changing mechanism 44. The lower end of the swing rail 43212 is a funnel shape that is easy to guide, so that the guide wheel on the carrier 2 can pass smoothly.

[0086] The track-changing mechanism 44 is installed at the bottom of the straight track 431 on the RX side and is mainly used for switching the height of the swing track 43212. The track-changing mechanism 44 is preferably a purely mechanical structure, without an independent power source and control system, eliminating the possibility of incorrect positioning of the swing track 43212. It has fewer potential failure points, higher reliability, and lower cost, and also produces no pollutants, eliminating the risk of contaminating the reactor pool. The track-changing mechanism 44 is driven by the transfer trolley 1 to switch the swing track 43212 between the lowering and raising positions. When the swing track 43212 is in the lowering position, the guide wheels on both sides of the carrier 2 run along the track of the arc-shaped track 4321 on the RX side through the guide openings of the swing track 43212, thereby achieving the flipping of the carrier 2 between the vertical and horizontal positions. When the swing track 43212 is in the raising position, the transfer trolley 1 can carry the carrier 2 under the swing track 43212. When the swing rail 43212 is in the descending position, the support positioning block 4322 at the bottom of the swing rail 43212 is inserted into the groove of the support positioning part 4316, which can effectively prevent the swing rail 43212 from swinging left and right and improve the left and right rigidity of the swing rail 43212. The bottom surface of the swing rail 43212 contacts the top surface of the support positioning part 4316, and the guide wheel of the carrier 2 can enter the RX side arc rail 4321. When the carrier 2 passes the swing rail 43212, part of its weight is transferred to the RX side straight rail 431 through the support positioning part 4316, and is not borne by the track changing mechanism 44. The track-changing mechanism 44 can adopt various structures to adjust the swing rail 43212, as long as it can switch between the lowering position and the raising position. When the track-changing mechanism 44 is a purely mechanical structure, it can be triggered by setting a corresponding component on the transfer trolley 1 or by setting a corresponding component on the carrier 2. The track-changing mechanism 44 can also be an electromagnetic or electric structure. Its specific structure and corresponding triggering method can adopt relatively mature existing technologies. This invention does not limit its structure or the triggering component adapted to its structure.

[0087] The RX-side tilting track 432 is structurally similar to the KX-side tilting track 412, but the RX-side arc-shaped track 4321 can swing, and the height of the flared end of the RX-side arc-shaped track 4321 can be changed by the track-changing mechanism 44. The swing of the RX-side arc-shaped track 4321 can be achieved through the hinge point or by relying on the elastic deformation of the arc-shaped track itself. The hinge point can be located at the upper or lower part of the RX-side arc-shaped track 4321.

[0088] The transfer trolley 1 of this invention can travel on the transfer track 4 (including the KX side straight track 411, the RX side straight track 431, and the inner track 421) to complete the transfer task of fuel components. In this embodiment, the transfer track 4 includes a bottom surface, side surfaces, and an open top surface. The traveling wheels 12 are supported on the bottom surface, providing support for the transfer trolley 1 and enabling the transfer trolley 1 to travel on the transfer track 4 (including the KX side straight track 411, the RX side straight track 431, and the inner track 421). The traveling guide wheels 13 contact the side surfaces and roll along them, providing left and right guidance for the transfer trolley 1. The transfer trolley 1 is engaged within the top surface to prevent accidental derailment. The push-pull drive mechanism 3, such as a rigid chain, provides power to the transfer trolley 1. The push-pull drive structure has low requirements for track machining and debugging accuracy, thereby effectively reducing manufacturing costs, assembly and debugging costs, and maintenance costs. Furthermore, the entire push-pull drive process is free of power alternation, eliminating the risk of jamming and power failure.

[0089] During operation, the KX-side tilting track 412 enables the carrier 2 to switch between horizontal and vertical positions within the fuel building. The RX-side tilting track 432 enables the carrier 2 to switch between horizontal and vertical positions within the reactor building. When the carrier 2 tilts to the vertical position, it comes into contact with the RX-side upper limit beam 43231 and the RX-side lower limit beam 43232, thus mechanically stopping the transfer trolley 1. The transfer trolley 1 is mechanically stopped, sensorless, low-cost, and highly reliable, effectively preventing the risk of the transfer trolley 1 exceeding its limits and damaging the fuel assembly. The carrier 2 tilting mechanism is a simply supported structure with strong constraints, making it more reliable than a single-axis tilting structure, and preventing the fuel assembly from falling.

[0090] During unloading, fuel assemblies are transported from the RX side to the KX side. The transfer trolley 1 and the carrier 2 are stored in the fuel building, with the carrier 2 in a vertical position. As the transfer trolley 1 moves towards the reactor building, the guide wheels of the carrier 2 move downwards along the arc-shaped rail 4121 on the KX side. The carrier 2 rotates around its hinge axis until it reaches a horizontal position, at which point the guide wheels of the carrier 2 disengage from the arc-shaped rail 4121 on the KX side. The transfer trolley 1 then carries the carrier 2 through the transfer channel 42 to the reactor building. The track-changing mechanism 44 is triggered, and the swing rail 43212 of the RX side tilting track 432 descends, stopping the transfer trolley 1 in place.

[0091] The transfer trolley 1 carries the carrier 2 towards the fuel plant. The guide wheels of the carrier 2 enter the RX-side arc-shaped rail 4321 and move upward along the arc-shaped rail. The carrier 2 rotates around the hinge axis until it reaches a vertical position. At the same time, the carrier 2 comes into contact with the RX-side upper limit beam 43231 and the RX-side lower limit beam 43232 and stops. Simultaneously, the transfer trolley 1 stops moving in place.

[0092] The loading and unloading machine loads fuel assemblies into carrier 2. The transfer trolley 1 moves towards the reactor building, and the guide wheels of carrier 2 move downwards along the RX-side arc-shaped rail 4321. Carrier 2 rotates around its hinge axis until it reaches a horizontal position, at which point the guide wheels disengage from the RX-side arc-shaped rail 4321. The track-changing mechanism 44 is triggered, and the swing rail 43212 of the RX-side tilting track 432 rises. The transfer trolley 1 stops after reaching its position.

[0093] The transfer trolley 1, carrying the carrier 2 and fuel assemblies, moves towards the fuel plant, passing through the transfer channel 42 to reach the fuel plant. The guide wheels of the carrier 2 enter the KX-side arc-shaped rail 4121 and move upward along the KX-side arc-shaped rail 4121. The carrier 2 rotates around the hinge axis until it reaches a vertical position, at which point the transfer trolley 1 contacts the limit baffle 4114, and the transfer trolley 1 stops moving. The spent fuel pool manipulator removes the fuel assemblies from the carrier 2 and hoists them to the storage compartment of the spent fuel pool for storage.

[0094] During the loading process, fuel assemblies are transported from the KX side to the RX side. After the unloading process is completed, the carrier 2 is in a vertical position. The spent pool manipulator loads the fuel assemblies into the carrier 2. The transfer trolley 1 moves towards the reactor building, and the guide wheels of the carrier 2 move downwards along the arc-shaped rail 4121 on the KX side. The carrier 2 rotates around the hinge axis until it is reversed to a horizontal position, at which point the guide wheels of the carrier 2 disengage from the arc-shaped rail 4121 on the KX side. Subsequently, the transfer trolley 1, carrying the carrier 2, continues to rotate through the transfer channel 42 to reach the reactor building. The track-changing mechanism 44 is triggered, and the swing rail 43212 of the RX side tilting track 432 descends. The transfer trolley 1 stops after reaching its position.

[0095] The transfer trolley 1 carries the carrier 2 towards the fuel plant. The guide wheels of the carrier 2 enter the RX-side arc-shaped rail 4321 and move upward along the RX-side arc-shaped rail 4321. The carrier 2 rotates around the hinge axis until it reaches a vertical position. At the same time, the carrier 2 comes into contact with the RX-side upper limit beam 43231 and the RX-side lower limit beam 43232 and stops. The transfer trolley 1 then stops moving.

[0096] The loading and unloading machine removes the fuel assembly to be loaded from the carrier 2 and hoists it to the pressure vessel. The transfer trolley 1 moves towards the reactor building, the guide wheel of the carrier 2 moves downward along the RX side arc rail 4321, the carrier 2 rotates around the hinge axis until it rotates to a horizontal state, the guide wheel of the carrier 2 disengages from the RX side arc rail 4321, the track changing mechanism 44 is triggered, the swing rail 43212 of the RX side flipping track 432 rises, and the transfer trolley 1 stops after it reaches its position.

[0097] The transfer trolley 1, carrying the carrier 2, moves towards the fuel plant, passing through the transfer channel 42 to reach the fuel plant. The guide wheels of the carrier 2 enter the KX-side arc-shaped rail 4121 and move upward along the KX-side arc-shaped rail 4121. The carrier 2 rotates around the hinge axis until it reaches a vertical position, at which point the transfer trolley 1 contacts the limit baffle 4114, and the transfer trolley 1 stops moving.

[0098] This utility model's transfer track, through the setup of a KX-side transfer track (including a KX-side straight track and a KX-side tilting track), a transfer channel, an RX-side transfer track (including an RX-side straight track and an RX-side tilting track), and a track-changing mechanism, requires only one drive mechanism to rotate the transfer trolley in conjunction with the carrier to complete the tilting of the carrier, thereby realizing the transfer of fuel assemblies. It eliminates the need to install two separate tilting frames in the reactor building and fuel building, simplifying the corresponding motors and transmission mechanisms, and reducing the machining accuracy, assembly accuracy, and maintenance costs of the guide rails. Furthermore, the tilting control is achieved through a mechanical structure, which is simple and reliable. The transport trolley operates on this transfer track without the risk of jamming, ensuring high reliability. Simultaneously, it effectively reduces the manufacturing and maintenance costs and control difficulty of transfer devices using this transfer track, making operation simple, safe, and reliable.

[0099] 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 transfer rail for core fuel assemblies of a nuclear reactor, characterized in that, include: The KX-side transfer track includes a KX-side straight track and a KX-side tilting track. The KX-side straight track is located inside the spent fuel pool of the fuel plant. The KX-side tilting track is located above the KX-side straight track. The RX-side transfer track includes an RX-side straight track and an RX-side tilting track. The RX-side straight track is located in the refueling pool of the reactor building. The RX-side tilting track is located above the RX-side straight track and close to the fuel building. A transfer channel runs through the containment wall between the fuel building and the reactor building. An inner track is installed within the transfer channel, with its two ends corresponding to the KX-side straight track and the RX-side straight track, respectively. The track-changing mechanism is installed at the bottom of the RX-side straight track, corresponding to the RX-side flip track, and works with the transfer trolley to switch the height of the RX-side flip track entrance position.

2. The core fuel assembly transfer rack of a nuclear reactor of claim 1, wherein, The KX side straight track and the RX side straight track each include: a straight track, multiple brackets, and adjustable feet for adjusting the height and level of the straight track. The straight track is mounted and supported on the multiple brackets, and the adjustable feet are respectively provided at the bottom of each bracket.

3. The core fuel assembly transfer rack of a nuclear reactor of claim 2, wherein, A limit baffle is provided at the end of the straight track on the KX side, and a connecting plate is provided at the end of the straight track on the RX side.

4. The transfer track for the core fuel assembly of the nuclear reactor as described in claim 2, characterized in that, Both the straight rail and the inner rail include a bottom surface, a side surface, and an open top surface. The bottom surface is provided with a rigid chain guide groove. The bottom surface is a common support surface for the transfer trolley and the rigid chain. The side surface is a guide surface for the transfer trolley. The top surface prevents the transfer trolley from accidentally derailing.

5. The transfer track for the core fuel assembly of the nuclear reactor as described in claim 2, characterized in that, The KX-side flipping track includes a KX-side fixed frame and a KX-side arc-shaped rail. The KX-side fixed frame is symmetrically installed on both sides of the KX-side straight rail by adjusting the feet. The KX-side arc-shaped rails on both sides are respectively connected to the KX-side fixed frame on the same side. The spacing of the KX-side arc-shaped rails is adapted to the carrier of the transfer trolley. The guide wheels on both sides of the carrier run along the track of the KX-side arc-shaped rail, realizing the flipping of the carrier in the vertical and horizontal positions.

6. The transfer track for the core fuel assembly of the nuclear reactor as described in claim 5, characterized in that, The KX-side arc-shaped rails are connected to the corresponding KX-side fixing frames via connecting columns; the KX-side arc-shaped rails are symmetrically arranged and connected at the top via connecting beams.

7. The transfer track for the core fuel assembly of the nuclear reactor as described in claim 1, characterized in that, The RX-side flipping track includes an RX-side fixed frame and an RX-side arc-shaped rail. The RX-side fixed frame is symmetrically installed on both sides of the RX-side straight rail by adjusting the feet. The spacing of the RX-side arc-shaped rail is adapted to the carrier of the transfer trolley. The RX-side arc-shaped rail includes a fixed rail and a swing rail. The fixed rail is installed on the RX-side fixed frame. The end of the fixed rail is connected to the top of the swing rail. A support positioning block is installed at the bottom of the end of the swing rail. A support positioning part is provided on the RX-side straight rail corresponding to the support positioning block. The track-changing mechanism is installed at the bottom of the RX-side straight rail corresponding to the support positioning block. The track-changing mechanism controls the swing rail to switch between a descending position and a rising position through the transfer trolley. When the swing rail is in the descending position, the guide wheels on both sides of the carrier run along the track of the RX-side arc-shaped rail through the guide opening of the swing rail, realizing the flipping of the carrier in the vertical and horizontal positions.

8. The transfer track for the core fuel assembly of the nuclear reactor as described in claim 7, characterized in that, The RX-side fixing frame is provided with an upper limit beam and / or a lower limit beam on the side of the factory building near the KX side. The two ends of the upper limit beam and the lower limit beam are respectively connected to the RX-side fixing frame on the corresponding side.

9. The transfer track for the core fuel assembly of the nuclear reactor as described in claim 7, characterized in that, The fixed rail is connected to the corresponding RX-side fixing frame via an RX-side connecting column; the fixed rails are symmetrically arranged and connected at the top via an RX-side connecting beam.

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

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