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

Abstract

The invention 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 used for realizing high-low switching of the inlet position of the RX side turnover rail.

Description

Technical Field

[0001] The present invention relates to the technology of refueling the core fuel assembly of a nuclear power plant, in particular to a transfer device for the core fuel assembly of a nuclear reactor applicable to a pressurized water reactor nuclear power plant and its transfer track. Background Art

[0002] As a clean energy source that does not produce greenhouse gases, nuclear power generation has been increasingly valued. As a typical representative of nuclear power generation technology, pressurized water reactor nuclear power plants have high power generation efficiency and fuel utilization rate, reducing energy waste, and thus are widely used.

[0003] During the operation of a pressurized water reactor nuclear power plant, the fuel assemblies in the core are continuously burned and converted into spent fuel assemblies. To ensure the normal operation of the nuclear power plant, it is necessary to regularly shut down the reactor to replace the fuel assemblies in the core. The core of the nuclear power plant is located in the reactor building (RX side), and the fresh fuel assemblies to be loaded and the spent fuel assemblies disassembled 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. As a key device for replacing fuel assemblies during the shutdown of a nuclear power plant, the fuel assembly transfer device is mainly used to transfer fuel assemblies between the reactor building and the fuel building, and plays an important role in the shutdown refueling process of a pressurized water reactor nuclear power plant.

[0004] At present, most of the fuel assembly transfer devices used in pressurized water reactor nuclear power plants are each provided with a set of driving mechanisms on the reactor building side and the fuel building side. The racks on the transport carts are driven by gears on the two sets of driving mechanisms in a relay manner to complete the task of transporting fuel assemblies from the reactor building via the transfer channel to the fuel building; there is one tilting frame in each of the reactor building and the fuel building, which are respectively bolted to the RX side track and the KX side track. When the carrier in the cart moves into place along with the transport cart, the tilting frame drives the carrier to complete the flipping, realizing the transfer of the fuel assembly. By driving the racks on the transport cart by gears on the two sets of driving mechanisms installed in the reactor building and the fuel building, the transfer of the fuel assembly between the reactor building (RX side) and the fuel building (KX side) is completed. This transmission method has high requirements for the machining accuracy and assembly accuracy of the guide rails and racks, resulting in a high cost of the transfer device, a complex control program, a risk of the transport cart getting stuck, and low reliability; and it is necessary to install two sets of tilting frames in the reactor building and the fuel building respectively, and be equipped with corresponding motors and transmission mechanisms to drive the steel cables to complete the flipping operation of the carrier, resulting in a high cost of the transfer device, and due to the need for the coordinated work of multiple control units, the control program is complex, and the maintenance and operation of the system are difficult. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a transfer device for the core fuel assembly of a nuclear reactor and its transfer track in view of the above-mentioned defects of the prior art.

[0006] To achieve the above object, the present invention provides a transfer track for a core fuel assembly of a nuclear reactor, which includes:

[0007] The KX-side transfer track includes a KX-side straight track and a KX-side flipping track. The KX-side straight track is located in the spent fuel pool of the fuel building and is used for the storage and walking guidance of the transfer cart; the KX-side flipping track is arranged above the KX-side straight track and is used to realize the flipping of the carrier between the vertical position and the horizontal position.

[0008] The RX-side transfer track includes an RX-side straight track and an RX-side flipping track. The RX-side straight track is located in the refueling pool of the reactor building and is used to support and run the transfer cart; the RX-side flipping track is arranged above the RX-side straight track and close to the fuel building side and is used to realize the flipping of the carrier between the vertical position and the horizontal position.

[0009] The transfer channel is installed through the containment wall between the fuel building and the reactor building. An inner track is installed in the transfer channel, and the two ends of the inner track are respectively arranged corresponding to the KX-side straight track and the RX-side straight track to realize the smooth cross-track walking of the transfer cart; and

[0010] The rail-changing mechanism is installed at the bottom of the RX-side straight track corresponding to the RX-side flipping track and is used to realize the height switching of the entrance position of the RX-side flipping track.

[0011] For the above-mentioned transfer track of the core fuel assembly of the nuclear reactor, the KX-side straight track and the RX-side straight track respectively include: a straight rail, a plurality of brackets and adjusting feet. The straight rail is installed and supported on the plurality of brackets, and the adjusting feet are respectively arranged at the bottom ends of each bracket. The adjusting feet are used to adjust the height and levelness of the straight rail to ensure the smooth cross-track walking of the transfer cart between the KX-side straight track, the inner track and the RX-side straight track.

[0012] For the above-mentioned transfer track of the core fuel assembly of the nuclear reactor, guiding ports are arranged at the joints of the straight rail and the inner track.

[0013] For the above-mentioned transfer track of the core fuel assembly of the nuclear reactor, a limit baffle is arranged at the end of the KX-side straight track, and a connecting plate is arranged at the end of the RX-side straight track to prevent the transfer cart from accidentally getting off the track.

[0014] The transfer track of the core fuel assembly of the nuclear reactor described above, wherein both the straight track and the inner track include a bottom surface, a side surface, and an open top surface. The bottom surface is provided with a rigid chain guiding groove for the auxiliary guiding of the rigid chain. The bottom surface is a common supporting surface for the transfer trolley and the rigid chain, the side surface is a guiding surface for the transfer trolley, and the top surface is used to prevent the transfer trolley from derailing accidentally.

[0015] The transfer track of the core fuel assembly of the nuclear reactor described above, wherein the KX-side flipping track includes a KX-side fixed frame and a KX-side arc track. The KX-side fixed frame is symmetrically installed on both sides of the KX-side straight track through adjusting floor bolts. The two KX-side arc tracks on both sides are respectively connected to the KX-side fixed frame on the same side. The spacing of the KX-side arc tracks is adapted to the carrier. The guiding wheels on both sides of the carrier respectively run along the tracks of the KX-side arc tracks to realize the flipping of the carrier between the vertical position and the horizontal position.

[0016] The transfer track of the core fuel assembly of the nuclear reactor described above, wherein the KX-side arc tracks are respectively connected to the corresponding KX-side fixed frames through connecting columns. The KX-side arc tracks are symmetrically arranged and connected at the top through a connecting beam.

[0017] The transfer track of the core fuel assembly of the nuclear reactor described above, wherein the RX-side flipping track includes an RX-side fixed frame and an RX-side arc track. The RX-side fixed frame is symmetrically installed on both sides of the RX-side straight track through adjusting floor bolts. The spacing of the RX-side arc tracks is adapted to the carrier. The RX-side arc track includes a fixed track and a swinging track. The fixed track is installed on the RX-side fixed frame. The end of the fixed track is connected to the top end of the swinging track. A support positioning block is installed at the bottom of the end of the swinging track. A support positioning part is provided on the RX-side straight track corresponding to the support positioning block. The track-changing mechanism is installed at the bottom of the RX-side straight track corresponding to the support positioning block. The track-changing mechanism adjusts the swinging track to switch between the descending position and the rising position. When the swinging track is in the descending position, the guiding wheels on both sides of the carrier run along the tracks of the RX-side arc track through the guiding openings of the swinging track to realize the flipping of the carrier between the vertical position and the horizontal position.

[0018] The transfer track of the core fuel assembly of the nuclear reactor described above, wherein an upper limit beam and / or a lower limit beam are provided on the side of the RX-side fixed frame close to the KX-side plant. The two ends of the upper limit beam and the lower limit beam are respectively connected to the RX-side fixed frame on the corresponding side.

[0019] The transfer track of the core fuel assembly of the nuclear reactor described above, wherein the fixed track is connected to the corresponding RX-side fixed frame through an RX-side connecting column. The fixed tracks are symmetrically arranged and connected at the top through an RX-side connecting beam.

[0020] To better achieve the above object, the present invention also provides a transfer device for the core fuel assembly of a nuclear reactor, which includes the above-mentioned transfer track.

[0021] The technical effect of the present invention is as follows:

[0022] Through the setting of the KX-side transfer track (including the KX-side straight track and the KX-side flipping track), the transfer channel, the RX-side transfer track (including the RX-side straight track and the RX-side flipping track), and the rail change mechanism, the transfer track of the present invention only requires one driving mechanism to drive the transfer trolley to cooperate with the carrier to complete the flipping of the carrier, realizing the transfer of the fuel assembly. There is no need to install two sets of tipping frames in the reactor building and the fuel building respectively, which simplifies the corresponding motors and transmission mechanisms, reduces the machining accuracy, assembly accuracy and maintenance cost of the guide rails; and the flipping control is realized by mechanical structures, which are simple and reliable. The transport trolley runs on this transfer track without the risk of jamming, and has high reliability; at the same time, it effectively reduces the manufacturing and maintenance costs and control difficulty of the transfer device using this transfer track, is easy to operate, and is safe and reliable.

[0023] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments, but it is not intended to limit the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 Schematic structural diagram of the fuel assembly transfer device according to an embodiment of the present invention;

[0025] Figure 2 Schematic structural diagram of the KX-side straight track according to an embodiment of the present invention;

[0026] Figure 3 Side view of the KX-side straight track according to an embodiment of the present invention;

[0027] Figure 4 Schematic structural diagram of the RX-side straight track according to an embodiment of the present invention;

[0028] Figure 5 Schematic structural diagram of the KX-side flipping track according to an embodiment of the present invention;

[0029] Figure 6 Schematic structural diagram of the RX-side flipping track according to an embodiment of the present invention;

[0030] Figure 7A Schematic installation position diagram of the rail change mechanism according to an embodiment of the present invention;

[0031] Figure 7B For Figure 7A partial enlarged view of.

[0032] Wherein, the reference numerals

[0033] 1 Transfer Trolley

[0034] 2 Carrier

[0035] 3 Push - Pull Driving Mechanism

[0036] 4 Transfer Track

[0037] 41 KX - side Transfer Track

[0038] 411 KX - side Straight Track

[0039] 4111 KX - side Straight Rail

[0040] 41111 Bottom Surface

[0041] 41112 Side Surface

[0042] 41113 Top Surface

[0043] 41114 Rigid Chain Guide Groove

[0044] 4112 KX - side Bracket

[0045] 4113 KX - side Adjusting Floor Anchor

[0046] 4114 Limit Baffle

[0047] 412 KX - side Flipping Track

[0048] 4121 KX - side Arc Track

[0049] 4122 Fixed Frame

[0050] 4123 Connecting Column

[0051] 4124 Reinforcing Leg

[0052] 4125 Connecting Beam

[0053] 4126 KX - side Flipping Adjusting Floor Anchor

[0054] 42 Transfer Passage

[0055] 421 Inner Track

[0056] 43 RX - side Transfer Track

[0057] 431 RX - side Straight Track

[0058] 4311 RX - side Straight Rail

[0059] 4312 Connecting Plate

[0060] 4313 Support Positioning Part

[0061] 4314 RX - side Adjusting Floor Anchor

[0062] 4315 RX Side Bracket

[0063] 432 RX Side Tipping Track

[0064] 4321 RX Side Curved Rail

[0065] 43211 Fixed Rail

[0066] 43212 Swing Rail

[0067] 4322 Support and Positioning Block

[0068] 4323 RX Side Fixed Frame

[0069] 43231 Upper Limit Beam

[0070] 43232 Lower Limit Beam

[0071] 4324 RX Side Tipping Anchor

[0072] 4325 RX Side Connecting Column

[0073] 4326 RX Side Reinforcing Leg

[0074] 4327 RX Side Connecting Beam

[0075] 44 Rail Change Mechanism

[0076] 5 Blind Flange

[0077] 6 Manual Gate Valve Detailed Embodiment

[0078] The structural principle and working principle of the present invention will be specifically described below with reference to the accompanying drawings:

[0079] See Figure 1 , Figure 1Schematic structural 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 applicable to the transfer of fuel assemblies in a pressurized water reactor nuclear power plant, 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 turning track 412), and a transfer channel 42. An inner track 421, an RX-side transfer track 43 (including an RX-side straight track 431 and an RX-side turning track 432), and a rail-changing mechanism 44 are arranged in the transfer channel 42. The push-pull drive mechanism 3, the KX-side straight track 411, and the KX-side turning track 412 are installed in the spent fuel pool of the fuel building. The RX-side straight track 431 and the RX-side turning 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 in the transfer channel 42. The cross-sectional structure of the inner track 421 in this embodiment is the same as that of the KX-side straight track 411, and bell mouths for easy guiding are arranged at both ends to prevent the transfer trolley 1 from getting stuck when crossing the tracks. The rail-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 work of the fuel assembly. The push-pull drive mechanism 3 provides power for the transfer trolley 1. The carrier 2 is hinged to the transfer trolley 1 and can be turned around the hinge axis. The KX-side turning track 412 can enable the carrier 2 to be turned between a horizontal state and a vertical state in the fuel building. The RX-side turning track 432 can enable the carrier 2 to be turned between a horizontal state and a vertical state in the reactor building.

[0080] This embodiment may further 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 refueling pool side of the reactor building, 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 replacement of the core fuel assembly is completed, the manual gate valve 6 is closed, the water in the refueling pool of the reactor building is drained, and the blind flange 5 is installed to seal the transfer channel 42.

[0081] In this embodiment, the transfer track 4 includes: a KX-side transfer track 41, which includes a KX-side straight track 411 and a KX-side turning track 412. The KX-side straight track 411 is located in the spent fuel pool of the fuel building; the KX-side turning track 412 is arranged above the KX-side straight track 411 and is used to cooperate with the transfer trolley 1 to realize the turning of the vertical position and the horizontal position of the carrier 2; an RX-side transfer track 43, which includes an RX-side straight track 431 and an RX-side turning track 432. The RX-side straight track 431 is located in the refueling pool of the reactor building; the RX-side turning track 432 is arranged above the RX-side straight track 431 and is used to cooperate with the transfer trolley 1 to realize the turning of the vertical position and the horizontal position of the carrier 2; a transfer channel 42, which is installed through the containment wall between the fuel building and the reactor building. An inner track 421 is installed in the transfer channel 42, and the two ends of the inner track 421 are respectively arranged corresponding to the KX-side straight track 411 and the RX-side straight track 431 to realize the stable cross-track walking of the transfer trolley 1; and a track-changing mechanism 44, which is installed at the bottom of the RX-side straight track 431 corresponding to the RX-side turning track 432 and is used to cooperate with the transfer trolley 1 or the carrier 2 to realize the height switching of the entrance position of the RX-side turning track 432; a touch block for driving the track-changing mechanism 44 is arranged at the bottom of the transfer trolley 1; wherein, the driving mechanism is a push-pull driving mechanism 3, the push-pull driving mechanism 3 is connected with the transfer trolley 1 and drives the transfer trolley 1 to travel 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 turns around the hinge axis. The transfer trolley 1 drives the carrier 2 to realize the switching between the horizontal position and the vertical position through the KX-side turning track 412 and the RX-side turning track 432 in the fuel building and the reactor building respectively, and completes the transfer of the fuel assembly.

[0082] See Figures 2 - 5 , Figure 2 is a schematic structural diagram of the KX-side straight track 411 according to an embodiment of the present invention, Figure 3 is a side view of the KX-side straight track 411 according to an embodiment of the present invention, Figure 4 is a schematic structural diagram of the RX-side straight track 431 according to an embodiment of the present invention, Figure 5Schematic diagram of the upward view structure of the RX-side straight track 431 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 walking guidance of the transfer cart 1; the RX-side straight track 431 is located in the refueling pool of the reactor building and is used to support the transfer cart 1 and serve as the running track of the transfer cart 1. The KX-side straight track 411 and the RX-side straight track 431 of this embodiment respectively include: a straight rail, a plurality of brackets (including the KX-side bracket 4112 and the RX-side bracket 4315), and adjusting feet (including the KX-side adjusting feet 4113 and the RX-side adjusting feet 4314). The straight rail is installed and supported on the plurality of brackets to ensure the stability and load-bearing capacity of the track. The adjusting feet are symmetrically arranged at the bottom end of each bracket, and the adjusting feet are welded and fixed to the stainless steel bottom surface of the spent fuel pool. The adjusting feet are used to adjust the height and levelness of the straight rail. By adjusting the adjusting feet, the KX-side straight track 411 is kept within a specified height deviation range from the inner track 421, so as to realize the smooth cross-track walking of the transfer cart 1 between the two tracks, that is, to ensure the smooth cross-track walking of the transfer cart 1 between the KX-side straight track 411, the inner track 421, and the RX-side straight track 431. A flared guiding port is provided at the connection between the straight rail and the inner track 421 to effectively avoid jamming when the transfer cart 1 walks across the track; a limiting baffle 4114 is provided at the end of the KX-side straight rail 4111, and a connecting plate 4312 is provided at the end of the RX-side straight rail 4311 to prevent the transfer cart 1 from accidentally disengaging from the track.

[0083] The RX-side straight track 431 of 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 in the shape of a flared mouth for easy guiding, and one end is connected by a connecting plate 4312. The connecting plate 4312 can prevent the transfer cart 1 from accidentally disengaging from the track; the RX-side adjusting feet 4314 are welded and fixed to the stainless steel bottom surface of the refueling pool of the reactor building.

[0084] The straight rail has the same structure as the inner track. 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. A rigid chain guiding groove 41114 is provided along the length direction of the bottom surface 41111 for the auxiliary guiding of the rigid chain 322; the bottom surface 41111 is the common supporting surface for the transfer cart 1 and the rigid chain 322, the side surface 41112 is the guiding surface for the transfer cart 1, and the top surface 41113 is used to prevent the transfer cart 1 from accidentally derailing. The KX-side straight track 411 realizes the co-track of the transfer cart 1 and the rigid chain 322, simplifies the track structure, and reduces the manufacturing cost.

[0085] See Figure 5 , Figure 5Schematic diagram of the KX-side flipping track 412 according to an embodiment of the present invention. In this embodiment, the KX-side flipping track 412 includes a KX-side fixing frame 4122 and a KX-side arc track 4121. The KX-side fixing frame 4122 is symmetrically installed on both sides of the KX-side straight track 411 through adjusting anchor bolts. The two KX-side arc tracks 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 tracks 4121 are connected to each other through a connecting beam 4125 to enhance the overall rigidity of the KX-side flipping track 412. The distance between the two KX-side arc tracks 4121 on both sides is adapted to the carrier 2. The traveling guide wheels 1323 on both sides of the carrier 2 respectively run along the tracks of the KX-side arc tracks 4121 to realize the flipping of the carrier 2 between the vertical position and the horizontal position. A guiding structure in the shape of a flared opening is provided at one end of the KX-side arc track 4121 adjacent to the KX-side straight track 411 to guide the guide wheels of the carrier 2 to smoothly switch between the KX-side arc track 4121 and the KX-side straight track 411. The KX-side fixing frame 4122 can be a triangular fixing frame, a rectangular fixing frame, an L-shaped fixing frame or a channel-shaped fixing frame. Preferably, a triangular fixing frame is adopted, which can be adjusted according to actual needs to adapt to different working environments. The KX-side arc track 4121 is connected to the two KX-side fixing frames 4122 through connecting columns 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 fixing frame 4122 is connected to the side wall of the spent fuel pool using a reinforcing leg 4124. The reinforcing leg 4124 is welded and fixed on the stainless steel side wall of the spent fuel pool. The reinforcing leg 4124 has a length adjustment function and can adjust its length according to actual needs to adapt to the installation requirements at different positions. The KX-side fixing frame 4122 is connected to the bottom surface of the spent fuel pool using a KX-side flipping adjustment anchor bolt 4126. The KX-side flipping adjustment anchor bolt 4126 is welded and fixed on the stainless steel bottom surface of the spent fuel pool. The KX-side flipping adjustment anchor bolt 4126 has a height adjustment function, and the height of the KX-side flipping track 412 can be adjusted through the KX-side flipping adjustment anchor bolt 4126.

[0086] See Figures 6 - 7B , Figure 6 Schematic diagram of the RX-side flipping track 432 according to an embodiment of the present invention, Figure 7A Schematic diagram of the installation position of the rail-changing mechanism 44 according to an embodiment of the present invention, Figure 7B is Figure 7APartial enlarged view. The RX-side flipping track 432 is located on the reactor building side. The RX-side flipping track 432 is similar in structure to the KX-side flipping track 412. The difference is that the RX-side arc track 4321 can swing. A touch block can be arranged at the bottom of the transfer trolley 1 to trigger the track-changing mechanism 44 to realize the rising or falling of the swing track 43212 of the RX-side arc track 4321, so as to change the height position of the open end of the swing track 43212 in the RX-side arc track 4321. The RX-side flipping track 432 of this embodiment includes an RX-side fixed frame 4323 and an RX-side arc track 4321. The RX-side fixed frame 4323 is symmetrically installed on both sides of the RX-side straight track 431 through RX-side flipping floor bolts 4324. The distance between the two RX-side arc tracks 4321 on both sides is adapted to the carrier 2; on the side of the RX-side fixed frame 4323 close to the KX-side building, an upper limit beam 43231 and a lower limit beam 43232 are arranged to realize the mechanical limit of the carrier in the vertical state of the RX-side building. The two ends of the upper limit beam 43231 and the lower limit beam 43232 are respectively connected to the corresponding RX-side fixed frame 4323, and can be arranged in parallel at the lower part of the RX-side fixed frame 4323, spanning the RX-side straight track 431 and located above the RX-side straight track 431. The RX-side fixed frame 4323 of this embodiment is preferably a right-angled triangular bracket structure. The upper limit beam 43231 and the lower limit beam 43232 are arranged in parallel at the lower part of one side of the vertical right-angled side of the triangular bracket. It is also possible to only arrange the upper limit beam 43231 or the lower limit beam 43232 and be located above the RX-side straight track 431. The RX-side arc track 4321 includes a fixed track 43211 and a swing track 43212. The fixed track 43211 is installed on the RX-side fixed frame 4323. Two symmetrically arranged fixed tracks 43211 are connected to each other through an RX-side connecting beam 4327 to enhance the overall rigidity of the RX-side flipping track 432; the fixed track 43211 of the RX-side arc track 4321 is connected to the two RX-side fixed frames 4323 through RX-side connecting columns 4325, increasing the distance between the two RX-side fixed frames 4323 and providing enough space for the offset loading of the fuel assembly. The RX-side fixed frame 4323 is connected to the side wall of the refueling pool using an RX-side reinforcing leg 4326. The RX-side reinforcing leg 4326 is welded and fixed on the stainless steel side wall of the refueling pool. The RX-side reinforcing leg 4326 has a length adjustment function and can adjust its length according to actual needs to adapt to the installation requirements of different positions; the RX-side fixed frame 4323 is connected to the bottom surface of the refueling pool using an RX-side flipping floor bolt 4324. The RX-side flipping floor bolt 4324 is welded and fixed on the stainless steel bottom surface of the refueling pool. The RX-side flipping floor bolt 4324 has a height adjustment function, and the height of the RX-side flipping track 432 can be adjusted through the RX-side flipping floor bolt 4324.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 away from the position where the guide wheel bears the maximum pressure during the flipping process 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 portion 4316 is provided on the RX side straight rail 4311 corresponding to the support positioning block 4322; the rail 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 lifted and lowered through the rail changing mechanism 44. The lower port of the swing rail 43212 is in the shape of a flared mouth that is easy to guide, so that the guide wheels on the carrier 2 can pass smoothly.

[0087] The rail changing mechanism 44 is installed at the bottom of the RX side straight track 431, and is mainly used for switching the high and low positions of the swing rail 43212. The rail changing mechanism 44 is preferably a pure mechanical structure, without an autonomous power source and a control system, there is no possibility of incorrect position of the swing rail 43212, there are fewer fault points, higher reliability and lower cost, and at the same time there are no pollutants and no risk of polluting the reactor pool. The rail changing mechanism 44 drives and controls the swing rail 43212 to switch between the lowered position and the raised position through the transfer trolley 1. When the swing rail 43212 is in the lowered position, the guide wheels on both sides of the carrier 2 run along the track of the RX side arc rail 4321 through the guide opening of the swing rail 43212, so as to realize the flipping of the carrier 2 between the vertical position and the horizontal position. When the swing rail 43212 is in the raised position, the transfer trolley 1 can carry the carrier 2 to pass under the swing rail 43212. When the swing rail 43212 is in the lowered position, the support positioning block 4322 at the lower part of the swing rail 43212 is inserted into the groove of the support positioning portion 4316, which can effectively prevent the left and right swing of the swing rail 43212 and improve the left and right rigidity of the swing rail 43212; the lower bottom surface of the swing rail 43212 contacts the upper top surface of the support positioning portion 4316, and the guide wheels of the carrier 2 can enter the RX side arc rail 4321. When the carrier 2 passes through the swing rail 43212, part of its gravity is transmitted to the RX side straight track 431 through the support positioning portion 4316 and is not borne by the rail changing mechanism 44. The rail changing mechanism 44 can adopt various structures to adjust the swing rail 43212, as long as the swing rail 43212 can be switched between the lowered position and the raised position. When the rail changing mechanism 44 is a pure mechanical structure, it can be triggered by setting corresponding components on the transfer trolley 1 or by setting corresponding components on the carrier 2; the rail changing mechanism 44 can also be an electromagnetic or electric structure, and its specific structure and corresponding triggering method can both adopt relatively mature existing technologies. The present invention does not limit its structure and the triggering components adapted to its structure.

[0088] The RX-side flipping track 432 is similar in structure to the KX-side flipping track 412. The difference is that the RX-side arc track 4321 can swing, and the height position of the bell mouth of the RX-side arc track 4321 can be changed through the track-changing mechanism 44. The swing of the RX-side arc track 4321 can be achieved by swinging at the hinge point or relying on the elastic deformation of the arc track itself. The hinge point can be set at the upper or lower part of the RX-side arc track 4321.

[0089] The transfer trolley 1 of the present 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 the fuel assembly. The transfer track 4 of this embodiment includes a bottom surface, a side surface, and an open top surface. The traveling wheels 12 are supported on the bottom surface to provide support for the transfer trolley 1 and enable 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 are in contact with the side surface and roll along the side surface to provide guidance for the transfer trolley 1 in the left-right direction, and the transfer trolley 1 is clamped in the top surface to prevent accidental derailment. The push-pull drive mechanism 3, such as a rigid chain, provides power for the transfer trolley 1. The push-pull drive structure has lower requirements for the machining accuracy and debugging accuracy of the track, thus effectively reducing the machining and manufacturing costs, assembly and debugging costs, and operation and maintenance costs. Moreover, there is no power alternation throughout the working process of the push-pull drive, and there is no risk of jamming and power failure.

[0090] During operation, the KX-side flipping track 412 enables the carrier 2 to realize the flipping and switching between the horizontal position and the vertical position in the fuel building. The RX-side flipping track 432 enables the carrier 2 to realize the flipping and switching between the horizontal position and the vertical position in the reactor building. When the carrier 2 is flipped to the vertical state, the carrier 2 contacts and stops with the RX-side upper limit beam 43231 and the RX-side lower limit beam 43232, realizing the mechanical limit stop of the transfer trolley 1. The transfer trolley 1 has mechanical limit, no sensors, low cost, and high reliability. At the same time, it can effectively avoid the risk of the transfer trolley 1 damaging the fuel assembly due to over-limitation. The carrier 2 is a simply supported structure when flipped, with strong constraints and more reliable flipping than the single-axis structure. The fuel assembly can avoid the risk of falling.

[0091] During the unloading process, the fuel assembly is transported from the RX side to the KX side. The transfer trolley 1 and the carrier 2 are stored in the fuel building, and the carrier 2 is in the vertical state. When the transfer trolley 1 moves towards the reactor building, the guide wheels of the carrier 2 move downward along the KX-side arc track 4121, and the carrier 2 flips with the hinge shaft as the center until it flips to the horizontal state. At this time, the guide wheels of the carrier 2 disengage from the KX-side arc track 4121. Subsequently, the transfer trolley 1 carries the carrier 2 and continues to pass through the transfer channel 42 to reach the reactor building. The track-changing mechanism 44 is triggered, and the swinging track 43212 of the RX-side flipping track 432 descends, and the transfer trolley 1 stops after reaching the position.

[0092] The transfer cart 1 carries the carrier 2 and moves towards the fuel building. The guide wheels of the carrier 2 enter the RX-side arc track 4321 and move upward along the arc track. The carrier 2 rotates around the hinge axis until it rotates to the vertical state. At the same time, the carrier 2 contacts and stops with the RX-side upper limit beam 43231 and the RX-side lower limit beam 43232. At the same time, the transfer cart 1 arrives at the position and stops moving.

[0093] The refueling machine loads the fuel assembly into the carrier 2. The transfer cart 1 moves towards the reactor building. The guide wheels of the carrier 2 move downward along the RX-side arc track 4321. The carrier 2 rotates around the hinge axis until it rotates to the horizontal state. The guide wheels of the carrier 2 disengage from the RX-side arc track 4321. The rail change mechanism 44 is triggered, and the swing track 43212 of the RX-side turning track 432 rises. After the transfer cart 1 arrives at the position, it stops.

[0094] The transfer cart 1 carries the carrier 2 and the fuel assembly and moves towards the fuel building, passing through the transfer channel 42 to reach the fuel building. The guide wheels of the carrier 2 enter the KX-side arc track 4121 and move upward along the KX-side arc track 4121. The carrier 2 rotates around the hinge axis until it rotates to the vertical state. At the same time, the transfer cart 1 contacts the limit baffle 4114, and the transfer cart 1 stops moving. The spent fuel pool manipulator takes out the fuel assembly in the carrier 2 and hoists it to the storage grid of the spent fuel pool for storage.

[0095] During the refueling process, the fuel assembly is transported from the KX side to the RX side. After the refueling process is completed, the carrier 2 is in the vertical state. The spent fuel pool manipulator loads the fuel assembly to be loaded into the carrier 2. The transfer cart 1 moves towards the reactor building. The guide wheels of the carrier 2 move downward along the KX-side arc track 4121. The carrier 2 rotates around the hinge axis until it rotates back to the horizontal state. The guide wheels of the carrier 2 disengage from the KX-side arc track 4121. Subsequently, the transfer cart 1 carries the carrier 2 and continues to turn through the transfer channel 42 to reach the reactor building. The rail change mechanism 44 is triggered, and the swing track 43212 of the RX-side turning track 432 descends. After the transfer cart 1 arrives at the position, it stops.

[0096] The transfer cart 1 carries the carrier 2 and moves towards the fuel building. The guide wheels of the carrier 2 enter the RX-side arc track 4321 and move upward along the RX-side arc track 4321. The carrier 2 rotates around the hinge axis until it rotates to the vertical state. At the same time, the carrier 2 contacts and stops with the RX-side upper limit beam 43231 and the RX-side lower limit beam 43232. At the same time, the transfer cart 1 arrives at the position and stops moving.

[0097] The charging and discharging machine takes out 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 wheels of the carrier 2 move downward along the RX-side arc rail 4321. The carrier 2 rotates around the hinge axis until it reaches the horizontal state. The guide wheels of the carrier 2 disengage from the RX-side arc rail 4321, and the rail change mechanism 44 is triggered. The swing rail 43212 of the RX-side turning rail 432 rises. After the transfer trolley 1 arrives at the position, it stops.

[0098] The transfer trolley 1 carries the carrier 2 and moves towards the fuel building, passing through the transfer channel 42 to reach the fuel building. The guide wheels of the carrier 2 enter the KX-side arc rail 4121 and move upward along the KX-side arc rail 4121. The carrier 2 rotates around the hinge axis until it reaches the vertical state. At the same time, the transfer trolley 1 contacts the limit baffle 4114, and the transfer trolley 1 stops moving.

[0099] Through the setting of the transfer rail of the present invention, including the KX-side transfer rail (including the KX-side straight rail and the KX-side turning rail), the transfer channel, the RX-side transfer rail (including the RX-side straight rail and the RX-side turning rail), and the rail change mechanism, only one driving mechanism is needed to drive the transfer trolley to cooperate with the carrier to complete the turning of the carrier, realizing the transfer of the fuel assembly. There is no need to install two sets of tipping frames in the reactor building and the fuel building respectively, which simplifies the corresponding motors and transmission mechanisms, reduces the machining accuracy, assembly accuracy and maintenance cost of the guide rails; and the turning control is realized by mechanical structures, with simple and reliable structures. There is no risk of jamming when the transport trolley runs on this transfer rail, and the reliability is high; at the same time, it effectively reduces the manufacturing and maintenance costs and control difficulty of the transfer device using this transfer rail, with simple operation, safety and reliability.

[0100] Certainly, the present invention can also have many other embodiments. Without departing from the spirit and essence of the present invention, those skilled in the art can make various corresponding changes and deformations according to the present invention. However, these corresponding changes and deformations should all fall within the protection scope of the appended claims of the present invention.

Claims

1. A transfer track for a core fuel assembly of a nuclear reactor, characterized in that, Comprising: The KX-side transfer track, including a KX-side straight track and a KX-side flipping track. The KX-side straight track is located in the spent fuel pool of the fuel building and is used for the storage and walking guidance of the transfer trolley. The KX-side flipping track is arranged above the KX-side straight track and is used to realize the flipping between the vertical position and the horizontal position of the carrier. The RX-side transfer track, including an RX-side straight track and an RX-side flipping track. The RX-side straight track is located in the refueling pool of the reactor building and is used to support and run the transfer trolley. The RX-side flipping track is arranged above the RX-side straight track and close to the fuel building side, and is used to realize the flipping between the vertical position and the horizontal position of the carrier. The transfer channel is installed through the containment wall between the fuel building and the reactor building. An inner track is installed in the transfer channel, and the two ends of the inner track are respectively arranged corresponding to the KX-side straight track and the RX-side straight track to realize the smooth cross-track walking of the transfer trolley; and The track-changing mechanism is installed at the bottom of the RX-side straight track corresponding to the RX-side flipping track and is used to realize the height switching of the entrance position of the RX-side flipping track.

2. The transfer track of the core fuel assembly of the nuclear reactor according to claim 1, characterized in that, The KX-side straight track and the RX-side straight track respectively include: a straight rail, a plurality of brackets and adjusting floor feet. The straight rail is installed and supported on the plurality of brackets, and the adjusting floor feet are respectively arranged at the bottom ends of each bracket. The adjusting floor feet are used to adjust the height and levelness of the straight rail to ensure the smooth cross-track walking of the transfer trolley between the KX-side straight track, the inner track and the RX-side straight track.

3. The transfer track of the core fuel assembly of the nuclear reactor according to claim 2, characterized in that A limit baffle is arranged at the end of the KX-side straight track, and a connecting plate is arranged at the end of the RX-side straight track to prevent the transfer trolley from accidentally getting out of the track.

4. The transfer track of the core fuel assembly of the nuclear reactor according to claim 2, characterized in that, Both the straight rail and the inner track include a bottom surface, a side surface and an open top surface. The bottom surface is provided with a rigid chain guiding groove for the auxiliary guiding of the rigid chain. The bottom surface is the common supporting surface for the transfer trolley and the rigid chain, the side surface is the guiding surface for the transfer trolley, and the top surface is used to prevent the transfer trolley from accidentally derailing.

5. The transfer track of the core fuel assembly of the nuclear reactor according to claim 2, characterized in that The KX-side flipping track includes a KX-side fixed frame and a KX-side arc track. The KX-side fixed frame is symmetrically installed on both sides of the KX-side straight track through adjusting floor feet. The two KX-side arc tracks on both sides are respectively connected to the KX-side fixed frame on the same side. The distance between the KX-side arc tracks is adapted to the carrier. The guiding wheels on both sides of the carrier respectively run along the tracks of the KX-side arc tracks to realize the flipping between the vertical position and the horizontal position of the carrier.

6. The transfer track of the core fuel assembly of the nuclear reactor according to claim 5, characterized in that, The KX-side arc tracks are respectively connected to the corresponding KX-side fixed frames through connecting columns; the KX-side arc tracks are symmetrically arranged and are connected by a connecting beam at the top.

7. The transfer track of the core fuel assembly of the nuclear reactor according to claim 1, characterized in that, The RX-side flipping track includes an RX-side fixed frame and an RX-side arc track. The RX-side fixed frame is symmetrically installed on both sides of the RX-side straight track through adjusting anchor bolts. The spacing of the RX-side arc track is adapted to the carrier. The RX-side arc track includes a fixed track and a swing track. The fixed track is installed on the RX-side fixed frame. The end of the fixed track is connected to the top end of the swing track. A support positioning block is installed at the bottom of the end of the swing track. A support positioning portion is provided on the RX-side straight track corresponding to the support positioning block. The track-changing mechanism is installed at the bottom of the RX-side straight track corresponding to the support positioning block. The track-changing mechanism adjusts the swing track to switch between a lowered position and a raised position. When the swing track is in the lowered position, the guide wheels on both sides of the carrier run along the track of the RX-side arc track through the guide openings of the swing track, so as to realize the flipping of the carrier between a vertical position and a horizontal position.

8. The transfer track of the core fuel assembly of the nuclear reactor according to claim 7, characterized in that, An upper limit beam and / or a lower limit beam are provided on one side of the RX-side fixed frame close to the KX-side workshop. The two ends of the upper limit beam and the lower limit beam are respectively connected to the corresponding RX-side fixed frame.

9. The transfer track of the core fuel assembly of the nuclear reactor according to claim 7, characterized in that, The fixed track is connected to the corresponding RX-side fixed frame through an RX-side connecting column. The fixed tracks are symmetrically arranged and connected at the top through an RX-side connecting beam.

10. A transfer device for the core fuel assembly of a nuclear reactor, characterized in that, It includes the transfer track according to any one of claims 1-9.

Images