A nuclear reactor detector assembly retrieval system and method

Abstract

The application relates to a nuclear reactor detector assembly recovery system and a recovery method, which comprises a shielding transfer device used for pulling out the detector from the nuclear reactor and transferring the detector to a preset position; a coiling device arranged on a guide rail assembly and moved under the liquid surface of a component pool through a lifting assembly, the coiling device being used for coiling part of the detector; and a dismantling platform arranged at the pool opening of the component pool, the dismantling platform being used for bearing a hanger assembly, a shearing assembly and a clamping assembly. The operation process of the shielding transfer device and the coiling device in the application can be independently carried out, so that the shielding transfer device can continuously operate, thereby increasing the recovery work efficiency of the detector and the recovery convenience; moreover, the pulling out, releasing and coiling of the detector are all carried out under the liquid surface, and shielding is carried out through the shielding transfer device in the transferring process, so that the problem of high radioactivity of the lower section of the detector is effectively solved, and the safety of the on-site construction environment is improved.

Description

A nuclear reactor detector assembly recovery system and method Technical Field

[0001] This application relates to the field of reactor equipment dismantling technology, and in particular to a nuclear reactor detector assembly recovery system and method. Background Technology

[0002] The reactor core measurement system includes core temperature measurement, core neutron injection rate measurement, and pressure vessel water level measurement, directly providing information on the coolant outlet temperature of the reactor fuel assemblies, the core neutron injection rate distribution, and the pressure vessel water level. Currently, reactor core measurement systems in related technologies adopt an integrated component form, integrating the detectors into one unit. That is, the detector assembly is inserted from above the reactor pressure vessel top cover and sent into the fuel assembly to achieve the measurement function.

[0003] During reactor operation, the integrated core measurement system (IPS) assembly remains within the pressure vessel, with its bottom constantly exposed to the fuel assemblies, resulting in prolonged and significant exposure to radiation. Due to the short design life of the IPS, it cannot be guaranteed to remain in place throughout the entire lifecycle of the nuclear power plant. Therefore, during refueling, it is necessary to remove and replace IPS assemblies nearing the end of their service life.

[0004] Based on the design of the guide tube for the core measurement system in the upper reactor internals and the depth limitations of the component pool, the integrated detector assembly will inevitably be exposed above the water surface during the complete removal process. The used integrated detector assembly is a highly radioactive object, with uneven distribution of radioactive dose at different locations; the dose within the fuel assembly during operation is extremely high, and radiation protection must be carefully considered for this part during dismantling.

[0005] In related technologies, methods for recovering detector components include using dismantling equipment with a trolley-like structure, shielded by a boric acid water layer, to extract the detector component to a certain height above the upper internal components, and then coil it up in situ. However, this recovery method has the following problems: the entire operation is carried out in a semi-enclosed cavity, making it inconvenient to repair when the equipment malfunctions. Summary of the Invention

[0006] Therefore, it is necessary to provide a nuclear reactor detector component recovery system and method to address the problem that the recovery process of related technologies is carried out in a semi-enclosed cavity, which makes it inconvenient to repair when the equipment fails.

[0007] This application first provides a nuclear reactor detector assembly recovery system, the nuclear reactor detector assembly recovery system comprising:

[0008] Shielded transport equipment is used to remove the detector from the nuclear reactor and transport it to a predetermined location;

[0009] A coiling device is installed on the guide rail assembly and is moved below the liquid surface of the component pool by a lifting assembly. The coiling device is used to coil up part of the detector.

[0010] A dismantling platform is set at the opening of the component pool. The dismantling platform is used to support the hanging frame assembly, the cutting assembly, and the clamping assembly. The hanging frame assembly is used to temporarily store the detectors released by the shielding transfer equipment. The cutting assembly is used to cut the detectors located at the preset positions. The clamping assembly is used to clamp the cut portion of the detectors and move them to the reeling equipment.

[0011] In one embodiment, the nuclear reactor detector assembly recovery system further includes:

[0012] A high-temperature container is positioned below the winding equipment and below the liquid surface of the component pool, for receiving a portion of the detector after it has been wound by the winding equipment.

[0013] In one embodiment, the shielded transfer device includes:

[0014] A shielding tube having a cavity for accommodating the detector;

[0015] A transfer mechanism is used to move the shielding tube.

[0016] In one embodiment, the shielded transfer device further includes:

[0017] A pull-out assembly is disposed within the cavity, and the lower end of the pull-out assembly is used to connect to the detector;

[0018] A winch assembly is disposed outside the shielding tube, and the winch assembly is connected to the pull-out assembly via a transmission bar.

[0019] A guide assembly, disposed at the upper end of the cavity, is used to wind the transmission bar so that the transmission bar enters the cavity from the hoisting assembly.

[0020] In one embodiment, the hoisting assembly includes a motor, the drive bar includes a rope, and the motor is used to wind up or release the rope.

[0021] In one embodiment, the guide rail assembly includes a support platform and a rail structure, the support platform being fixed to the edge of the component pool;

[0022] The upper end of the track structure is connected to the support platform, and the lower end of the track structure abuts against the bottom of the component pool;

[0023] The lifting component is mounted on the support platform and is connected to the winding equipment via a tension bar to drive the winding equipment to move up and down.

[0024] In one embodiment, the reeling device includes:

[0025] The fixing plate is slidably connected to the guide rail assembly;

[0026] The movable plate is mounted on the fixed plate via a first slide rail.

[0027] A first driving unit is disposed between the movable plate and the fixed plate, and is used to drive the movable plate to move along a first direction;

[0028] A reel, the reel being used to wind up a portion of the detector;

[0029] A second drive unit is disposed on the movable plate and connected to the end of the drum. The second drive unit is used to drive the drum to rotate.

[0030] In one embodiment, the reeling apparatus further includes:

[0031] The first baffle is mounted on the fixed plate via the second slide rail, and the first baffle is located at the end of the drum;

[0032] A third driving unit is disposed on the fixed plate and connected to the first baffle. The third driving unit is used to drive the first baffle to move along the first direction so that the first baffle abuts against the end of the drum or moves away from the end of the drum.

[0033] In one embodiment, the reeling apparatus further includes:

[0034] The second baffle is fixed to the fixed plate. The second baffle and the first baffle are spaced apart along the first direction. The second baffle is used to be sleeved on the roll so that when the roll moves away from the first baffle along with the moving plate, the part of the detector wound on the roll is disengaged from the roll.

[0035] In one embodiment, the reeling apparatus further includes:

[0036] A sliding plate is mounted on the fixed plate via a third slide rail;

[0037] A fourth driving unit is disposed on the fixed plate and connected to the sliding plate, for driving the sliding plate to reciprocate along the first direction;

[0038] A clamping assembly is disposed on the fixing plate, the clamping assembly being used to clamp a portion of the detector.

[0039] In one embodiment, the clamping assembly includes a first clamping roller, a second clamping roller, and a fifth driving unit. The first clamping roller is fixed to the sliding plate, and the fifth driving unit is disposed on the sliding plate. The output end of the fifth driving unit is connected to the second clamping roller. The fifth driving unit is used to drive the second clamping roller to move along a first direction to move closer to or further away from the first clamping roller.

[0040] In one embodiment, the reeling apparatus further includes:

[0041] A support frame is mounted on the fixed plate via a fourth slide rail. The support frame, the movable plate, and the sliding plate are arranged sequentially along a second direction, which intersects with the first direction.

[0042] The sixth driving unit is disposed between the fixed plate and the support frame, and is used to drive the support frame to move along the first direction;

[0043] A guide cylinder, mounted on the support frame via a fifth slide rail, has an inlet and is capable of moving along the second direction under the drive of a seventh drive unit to receive a portion of the detector falling from the second baffle.

[0044] In one embodiment, the guide tube extends along the second direction, the guide tube further includes an outlet, and a buffer plate is disposed between the inlet and the outlet, the buffer plate being used to switch between an open state and a closed state. In the open state, the inlet is connected to the outlet, and in the closed state, the buffer plate is used to buffer a portion of the detector entering from the inlet.

[0045] In one embodiment, the demolition platform includes:

[0046] A bridge component is provided at the opening of the component pool;

[0047] Multiple maintenance platforms are connected to the inner side of the bridge components in the circumferential direction and located above the component pool, for shielding the maintenance and operation of the transfer equipment and lifting components;

[0048] Multiple cage assemblies are connected to the inner side of the bridge assembly in the circumferential direction and are located above the component pool for disassembling the detector; the multiple cage assemblies and the multiple maintenance platforms are arranged sequentially at intervals around the circumference of the bridge assembly;

[0049] The shearing component and the hanging bracket component are disposed on the bridge component.

[0050] In one embodiment, the upper reactor component of the nuclear reactor is provided with a plurality of guide rods evenly arranged around the circumference of the component pool;

[0051] The dismantling platform also includes multiple stabilizing platforms and multiple stabilizing components that correspond one-to-one with the multiple guide rods;

[0052] The stabilizing platform is connected to the inner side of the bridge component in the circumferential direction and is located above the component pool. The stabilizing component is disposed on the corresponding stabilizing platform, and one end of the stabilizing component extending into the component pool is connected to one of the guide rods.

[0053] This application also provides a method for recovering a detector assembly, applied to the nuclear reactor detector assembly recovery system described in the above embodiments, the recovery method comprising:

[0054] Install the shielded transfer equipment, guide rail assembly, lifting assembly, coiling equipment, dismantling platform, hanging rack assembly, shearing assembly and clamping assembly at the corresponding positions in the component pool;

[0055] The shielding transfer device is controlled to extend below the liquid surface of the component pool, and the detector is pulled out and lifted into the shielding tube;

[0056] Control the shielding transfer device to move out of the liquid surface of the component pool, move it to the hanging assembly of the dismantling platform, and then extend it back into the liquid surface of the component pool while releasing the detector;

[0057] The detector is suspended on the bracket assembly and then cut to separate it into an upper detector segment and a lower detector segment.

[0058] The lower section detector is wound up using a winding device, and the high-frequency amplification container is controlled to receive the wound lower section detector.

[0059] In one embodiment, the step of installing the dismantling platform at the component pool includes:

[0060] The bridge assembly is placed around the opening of the component pool, and multiple maintenance platforms and multiple cage assemblies are connected to the bridge assembly.

[0061] The multiple stabilization components on the dismantling platform are connected one by one to the multiple guide rods on the upper reactor structure of the nuclear reactor.

[0062] In one embodiment, the steps of controlling the shielded transfer device to extend below the liquid surface of the component pool and to pull out and lift the detector into the shielded tube include:

[0063] Remove the protective shell from the top of the detector and install the clamp;

[0064] The shielding tube is moved above the detector to be pulled out by the transfer mechanism, and the extraction component is reinforced and connected to the clamp.

[0065] The shielding tube is driven into the liquid below the surface, and the winch assembly is activated to drive the transmission bar to lift the extraction assembly until the detector is completely inside the shielding tube.

[0066] In one embodiment, the step of controlling the shielding transfer device to move out of the liquid surface of the component pool, move it to the bracket assembly of the dismantling platform, and then submerge it again under the liquid surface of the component pool while releasing the detector includes:

[0067] The transfer mechanism moves the shielding tube out of the water and onto the hanger assembly;

[0068] The shielded transfer device is driven to re-enter the liquid surface, and the winch assembly is activated to release the transmission bar, so that the detector is detached from the shielded tube.

[0069] Drive the shielding transfer device to rise, remove the extraction assembly and the clamp, and suspend the clamp on the hanger assembly.

[0070] In one embodiment, the step of using a winding device to wind up the lower section detector includes:

[0071] The cut-off lower detector segment is transferred to the clamping assembly by the clamping assembly, and the end of the lower detector segment is inserted between the first baffle and the drum. The first baffle is driven to approach the drum by the third drive unit to clamp the lower detector segment.

[0072] The second drive unit is activated to rotate the drum, thereby winding the lower detector onto the drum. After winding a preset number of turns, the winding device is controlled to move downwards by a preset distance.

[0073] After the drum, in conjunction with the clamping assembly, has coiled the lower section of the detector, the clamping assembly moves to avoid obstruction.

[0074] Driven by the seventh drive unit, the guide cylinder is positioned between the first baffle and the second baffle, controlling the drum to move away from the second baffle. The guide cylinder receives the lower section detector that falls off from the drum and transports the lower section detector into the high-powered amplification container.

[0075] The aforementioned nuclear reactor detector assembly recovery system and method utilizes a shielded transfer device to extract and transport the detector to a preset location, and can temporarily store it in a mounting frame assembly. A coiling device coils the lower section of the sheared detector to reduce its volume. The shielded transfer device and the coiling device can operate independently, allowing the shielded transfer device to operate continuously, thereby increasing the efficiency and convenience of detector recovery. Furthermore, since the extraction, release, and coiling of the detector are all performed underwater, and shielding is provided during transfer, the issue of high radioactivity in the lower section of the detector is effectively addressed, improving the safety of the on-site construction environment. In addition, by establishing a dismantling platform on the component pool, manual debugging and emergency maintenance of the shielded transfer device and coiling device are facilitated, making the installation and commissioning of the entire recovery system more convenient and efficient. Attached Figure Description

[0076] Figure 1 is a schematic diagram of the overall structure of a nuclear reactor detector assembly recovery system provided according to some embodiments of this application.

[0077] Figure 2 is a schematic diagram of the overall structure of a shielded transfer device provided according to some embodiments of this application.

[0078] Figure 3 is a partial cross-sectional view of a shielded transport device provided according to some embodiments of this application.

[0079] Figure 4 is a structural schematic diagram of a hoisting assembly provided according to some embodiments of this application.

[0080] Figure 5 is a schematic diagram of the structure of a guide component provided according to some embodiments of this application.

[0081] Figure 6 is a schematic diagram of the structure of a guide rail assembly provided according to some embodiments of this application.

[0082] Figure 7 is a schematic diagram of the structure of a support platform provided according to some embodiments of this application.

[0083] Figure 8 is a schematic diagram of the structure between the guide rail assembly, winding equipment, lifting assembly and high-pressure container provided according to some embodiments of this application.

[0084] Figure 9 is a structural diagram of the guide rail assembly, winding equipment and lifting assembly provided according to some embodiments of this application.

[0085] Figure 10 is a schematic diagram of the structure of a lifting component provided according to some embodiments of this application.

[0086] Figure 11 is a schematic diagram of the overall structure of a coiling device provided according to some embodiments of this application.

[0087] Figure 12 is a front view structural schematic diagram of a reeling device provided according to some embodiments of this application.

[0088] Figure 13 is one of the partial structural schematic diagrams of a coiling device provided according to some embodiments of this application.

[0089] Figure 14 is a second partial structural schematic diagram of a coiling device provided according to some embodiments of this application.

[0090] Figure 15 is a partial structural schematic diagram of a coiling device provided according to some embodiments of this application.

[0091] Figure 16 is a fourth partial structural schematic diagram of a coiling device provided according to some embodiments of this application.

[0092] Figure 17 is a schematic diagram of the rear structure of a coiling device provided according to some embodiments of this application.

[0093] Figure 18 is a schematic diagram of the overall structure of the demolition platform provided according to some embodiments of this application.

[0094] Figure 19 is a structural schematic diagram of a dismantling platform from another perspective, according to some embodiments of this application.

[0095] Figure 20 is a flowchart illustrating a method for recovering a detector component according to some embodiments of this application.

[0096] Icon labels:

[0097] 100. Shielded transfer equipment; 110. Shielded tube body; 111. Tube cavity; 120. Pull-out assembly; 130. Hoisting assembly; 140. Guide assembly;

[0098] 200. Guide rail assembly; 210. Support platform; 220. Rail structure;

[0099] 300. Coiling equipment; 310. Fixed plate; 311. Guide wheel; 320. Moving plate; 325. First slide rail; 326. First drive unit; 321. Drum; 322. Second drive unit; 331. First baffle; 334. Second slide rail; 332. Third drive unit; 333. Second baffle; 340. Sliding plate; 343. Third slide rail; 341. Fourth drive unit; 342. Clamping assembly; 3421. First clamping roller; 3422. Second clamping roller; 3423. Fifth drive unit; 350. Support frame; 353. Fourth slide rail; 351. Sixth drive unit; 352. Guide cylinder; 3521. Inlet; 3522. Outlet; 356. Seventh drive unit; 354. Buffer plate;

[0100] 400. Dismantling platform; 410. Bridge component; 420. Maintenance platform; 430. Cage component; 440. Stabilizing platform; 441. Stabilizing component;

[0101] 500. Component upgrade;

[0102] 600. Upper stacking components; 610. Guide rod;

[0103] 700, Component Pool;

[0104] 800, high-temperature container. Detailed Implementation

[0105] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0106] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0107] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0108] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0109] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0110] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0111] Referring to Figure 1, which is a schematic diagram of the overall structure of a nuclear reactor detector assembly recovery system provided according to some embodiments of this application, the nuclear reactor detector assembly recovery system provided in one embodiment of this application may include a shielded transfer device 100, a coiling device 300, and a dismantling platform 400.

[0112] The shielded transfer device 100 is used to pull the detector out of the nuclear reactor and transfer it to a preset position; the coiling device 300 is set on the guide rail assembly 200 and is driven by the lifting assembly 500 to move below the liquid surface of the component pool 700. The coiling device 300 is used to coil up part of the detector; the removal platform 400 is set at the pool opening of the component pool 700. The removal platform 400 is used to carry the hanging assembly, the shearing assembly and the clamping assembly. The hanging assembly is used to temporarily store the detector released by the shielded transfer device 100. The shearing assembly is used to shear the detector located at the preset position. The clamping assembly is used to clamp the sheared part of the detector and move it to the coiling device 300.

[0113] Understandably, when the detector is operational, its lower section is inserted into the nuclear reactor fuel assembly. The upper section of the detector is farther from the fuel assembly than the lower section. Because the reactor pressure vessel is radioactive, the detector will become contaminated and thus also radioactive. Furthermore, since the upper section is farther from the fuel assembly, the lower section of the detector is more radioactive than the upper section. Therefore, when recovering the detector, the lower and upper sections are generally retrieved separately.

[0114] The upper section of the detector, due to its lower radioactivity, can be stored elsewhere for recovery. The lower section of the detector, after being reeled in 300 coils to reduce its volume, will then be recovered.

[0115] To facilitate manual movement and operation, the dismantling platform 400 is positioned above the component pool 700, with a designated area in the middle of the platform corresponding to the detector below, allowing the shielded transfer device 100 to extract the detector from this area. The shielded transfer device 100 can move omnidirectionally above the component pool 700 using a hoisting device (ring crane). After the shielded transfer device 100 enters the liquid surface of the component pool 700 and extracts the detector from the nuclear reactor, i.e., after the detector is completely placed inside the shielded transfer device 100, the device 100 detaches from the liquid surface and passes over the dismantling platform 400 to reach the location of the mounting bracket assembly. To facilitate the winding of the detector by the winding device 300, the mounting bracket assembly is typically positioned on one side of the winding device 300.

[0116] Next, the shielded transfer device 100 enters the liquid surface. While releasing the detector, the shielded transfer device 100 is lifted upward until the top of the detector is exposed above the water surface. The detector can be suspended on the hanger assembly by manual or robotic arm operation to facilitate subsequent cutting and coiling operations on the detector.

[0117] During the aforementioned transfer of the detector, due to contamination and radioactivity, the removal and deployment processes were conducted underwater. The detector was isolated from the external environment by a shielding enclosure. Because the lower section of the detector was located within the fuel assembly during operation, it experienced the most severe contamination and thus had the highest radioactivity. The upper section of the detector was farther from the reactor core; therefore, the closer to the top of the detector, the lower the radioactivity. Due to the detector's sufficient length, the end furthest from the reactor core had low radioactivity, allowing the upper part of the detector to extend above the water surface for easier operation by personnel.

[0118] The coiling device 300 is usually installed on the side wall of the component pool 700. To facilitate the up and down movement of the coiling device 300, a guide rail assembly 200 is provided on the side of the component pool 700. A lifting assembly 500 is also provided at the upper end of the guide rail assembly 200, i.e., on the side of the pool. The lifting assembly 500 is connected to the coiling device 300 and can drive the coiling device 300 to rise or fall along the guide rail assembly 200.

[0119] The detector placed on the mounting assembly can be cut by the shearing assembly into an upper and lower detector section. Understandably, the detector sections have different diameters, with the lower section having a smaller diameter than the upper section. The lower section's diameter is typically 7.5mm. Therefore, the shearing assembly can cut at the junction of the different detector diameters. The cut lower section can then be clamped by a clamping assembly for easy movement to the coiling device 300 for coiling. Due to the higher radioactivity of the lower section, the coiling device 300 is also positioned below the liquid surface, where the lower section is coiled.

[0120] This example allows the shielded transport device 100 and the reeling device 300 to work independently by temporarily storing the transported detector at the mounting assembly, thereby increasing the efficiency and convenience of detector retrieval.

[0121] It should be noted that the detectors transferred by the shielded transfer equipment 100 can be directly transported to the reeling equipment 300 after being cut and clamped, that is, without going through the hanging frame assembly. In addition, the above-mentioned operations on the cutting and clamping components can be carried out automatically by the equipment or manually by personnel standing on the dismantling platform 400, and no specific restrictions are made here.

[0122] In this application, the shielded transfer device 100 is used to pull out and transfer the detector to a preset position, and can temporarily store it in the hanging frame assembly. The coiling device 300 coils the lower section of the sheared detector to reduce its volume. The operation processes of the shielded transfer device 100 and the coiling device 300 can be carried out independently, allowing the shielded transfer device 100 to operate continuously, thereby increasing the efficiency and convenience of detector recovery. Moreover, since the pulling out, release, and coiling of the detector are all carried out underwater, and the shielding is provided by the shielded transfer device 100 during the transfer process, the problem of high radioactivity in the lower section of the detector is effectively solved, improving the safety of the on-site construction environment. In addition, by building a dismantling platform 400 on the component pool 700, it is convenient for manual debugging and emergency maintenance of the shielded transfer device 100, coiling device 300, etc., making the installation and debugging of the entire recovery system more convenient and faster.

[0123] The specific structure of the nuclear reactor detector assembly recovery system provided in the embodiments of this application will now be described with reference to Figures 1-19.

[0124] Figure 8 is a schematic diagram of the structure between the guide rail assembly, the reeling device, the lifting assembly, and the high-level radioactive container according to some embodiments of this application. Referring to Figure 8, in some embodiments, the nuclear reactor detector assembly recovery system further includes a high-level radioactive container 800, disposed below the reeling device 300 and below the liquid surface of the component pool 700, for receiving a portion of the detector after it has been reeled by the reeling device 300.

[0125] Specifically, the high-level radioactive container 800 is located below the liquid surface, which can also be understood as being placed at the bottom of the component pool 700 or at a safe underwater depth. The high-level radioactive container 800 is used to store the lower section detector after it has been coiled. The whole can be made of stainless steel and is mainly composed of an upper tube seat, a cylinder, a lower tube seat and a high-level radioactive container cover. The high-level radioactive container cover is provided with multiple pin holes, so that the high-level radioactive container 800 can be opened or closed by using an external long rod assembly in conjunction with the pin holes.

[0126] A grid can be set at the guide rail assembly 200 to place and stabilize the high-voltage container 800. Multiple high-voltage containers 800 can be set below the reeling equipment 300 so that after one high-voltage container 800 is filled with the lower-segment detector, the lower-segment detector can be placed into another high-voltage container 800, thereby maintaining the working continuity of the reeling equipment 300 and improving the working efficiency of the entire recycling system.

[0127] Referring to Figures 2 to 5, Figure 2 is a schematic diagram of the overall structure of a shielded transfer device according to some embodiments of this application. Figure 3 is a partial cross-sectional schematic diagram of a shielded transfer device according to some embodiments of this application. Figure 4 is a schematic diagram of the structure of a hoisting assembly according to some embodiments of this application. Figure 5 is a schematic diagram of the structure of a guiding assembly according to some embodiments of this application. In some embodiments, the shielded transfer device 100 may include a shielded tube 110 and a transfer mechanism. The shielded tube 110 has a cavity 111 for accommodating a detector; the transfer mechanism is used to move the shielded tube 110.

[0128] Specifically, the transfer mechanism can be understood as a hoisting device, such as a ring hoist, to move and transfer the shielded transfer device 100 above the component pool 700.

[0129] The shielding tube 110 comprises an upper half and a lower half, which are fixedly connected and have the same inner diameter. The outer diameter of the lower half of the shielding tube 110 is larger than that of the upper half, resulting in a greater wall thickness for the lower half than for the upper half. As can be seen from the above, the lower section of the detector has stronger radioactivity than the upper section. During detector transport, the lower section of the detector is located in the lower half of the shielding tube 110, and the upper section is located in the upper half. Therefore, the greater wall thickness of the lower half of the shielding tube 110 compared to the upper half allows for more reliable shielding of the lower section's radioactivity, making it safer and more reliable.

[0130] As shown in Figure 3, in some embodiments, the shielded transfer device 100 may further include a pull-out assembly 120, a winch assembly 130, and a guide assembly 140. The pull-out assembly 120 is disposed inside the cavity 111, and its lower end is used to connect to the detector; the winch assembly 130 is disposed outside the shielded tube 110, and is connected to the pull-out assembly 120 via a transmission bar; the guide assembly 140 is disposed at the upper end of the cavity 111, and is used to wind the transmission bar so that the transmission bar enters the cavity 111 from the winch assembly 130.

[0131] Specifically, the extraction assembly 120 includes a counterweight and a lifting ring embedded in the cavity 111 of the shielding tube 110, the lifting ring being used to connect with the detector. The winch assembly 130 is located at the connection between the upper and lower halves of the shielding tube 110, and includes a winch. One end of a transmission bar is wound around the drum of the winch, and the other end of the transmission bar is wound around the guide assembly 140 and then connected to the end of the counterweight.

[0132] During use, the drive bar is released by the winch, and under the weight of the counterweight, the lifting ring protrudes from the lower end of the shielding tube 110, allowing the detector to be installed on or removed from the lifting ring manually or by a robotic arm. As the winch retracts, the drive bar pulls the counterweight upwards, facilitating the lifting of the detector into the shielding tube 110.

[0133] In one example, the hoisting assembly 130 includes a motor, and the drive bar includes a rope. The motor is used to wind up or release the rope. Specifically, the drive bar can be a steel wire or a chain, and the aforementioned guide assembly 140 can be a fixed pulley.

[0134] Referring to Figures 6, 7, and 9, Figure 6 is a structural schematic diagram of a guide rail assembly provided according to some embodiments of this application. Figure 7 is a structural schematic diagram of a support platform provided according to some embodiments of this application. Figure 9 is a structural schematic diagram of the guide rail assembly, winding device, and lifting assembly provided according to some embodiments of this application. In some embodiments, the guide rail assembly 200 includes a support platform 210 and a track structure 220. The support platform 210 is fixed to the edge of the component pool 700; the upper end of the track structure 220 is connected to the support platform 210, and the lower end of the track structure 220 abuts against the bottom of the component pool 700; the lifting assembly 500 is disposed on the support platform 210, and the lifting assembly 500 is connected to the winding device 300 through a tension bar to drive the winding device 300 to move up and down.

[0135] Specifically, the support platform 210 is located at the edge of the component pool 700 and has a bearing surface for supporting the track structure 220. The track structure 220 can be disassembled into multiple sections for installation, but there are no specific restrictions. The support platform 210 facilitates not only the connection of the track structure 220 but also the installation of the lifting assembly 500. Of course, the lifting assembly 500 can also be located above the support platform 210, but it is fixedly connected to the edge of the component pool 700. The lifting assembly 500 can also be understood as a winch, which is connected to the winding equipment 300 through a pull bar (such as steel wire, chain, etc.) to realize the raising or lowering of the winding equipment 300 on the track structure 220.

[0136] Figure 11 is a schematic diagram of the overall structure of a coiling device according to some embodiments of this application. Figure 12 is a front view of a coiling device according to some embodiments of this application. Figure 13 is one of the partial structural schematic diagrams of a coiling device according to some embodiments of this application. Figure 14 is another partial structural schematic diagram of a coiling device according to some embodiments of this application. Figure 15 is a third partial structural schematic diagram of a coiling device according to some embodiments of this application. Figure 16 is a fourth partial structural schematic diagram of a coiling device according to some embodiments of this application. Figure 17 is a rear structural schematic diagram of a coiling device according to some embodiments of this application.

[0137] As shown in Figures 11 and 13, in some embodiments, the winding device 300 may include a fixed plate 310, a movable plate 320, a first drive unit 326, a drum 321, and a second drive unit 322. The fixed plate 310 is slidably connected to the guide rail assembly 200; the movable plate 320 is disposed on the fixed plate 310 via a first slide rail 325; the first drive unit 326 is disposed between the movable plate 320 and the fixed plate 310 and is used to drive the movable plate 320 to move along a first direction; the drum 321 is used as a detector for the winding portion; the second drive unit 322 is disposed on the movable plate 320 and is connected to the end of the drum 321, and is used to drive the drum 321 to rotate.

[0138] Specifically, the back of the fixing plate 310 is provided with multiple guide wheels 311 to contact the track structure 220, thereby facilitating the up-and-down movement of the fixing plate 310 along the track structure 220 under the drive of the traction bar. The front of the fixing plate 310 can be composed of four main parts. The first main part can be the part that allows the lower detector to bend. The first drive unit 326 can include a telescopic motor, thereby driving the moving plate 320 to move relative to the fixing plate 310 in a first direction (horizontal direction); the second drive unit 322 includes a motor and a reducer. The output end of the reducer is connected to a drum 321, that is, the axis of the drum 321 is along the first direction. The rotation of the drum 321 can coil (spring-like) around the lower detector, thereby reducing the volume of the detector to facilitate the recovery of the high-explosive container 800.

[0139] The second part may be, as shown in Figure 14, in some embodiments, the winding device 300 further includes a first baffle 331, which is disposed on the fixed plate 310 via a second slide rail 334, and the first baffle 331 is located at the end of the drum 321; a third drive unit 332 is disposed on the fixed plate 310 and connected to the first baffle 331, and the third drive unit 332 is used to drive the first baffle 331 to move along a first direction so that the first baffle 331 abuts against the end of the drum 321, or moves away from the end of the drum 321.

[0140] Specifically, the end of the drum 321 facing the first baffle 331 may have a notch for the end of the lower detector to enter. Before the lower detector is wound around the drum 321, the third drive unit 332 drives the first baffle 331 to move away from the drum 321, thereby facilitating the entry of the end of the lower detector into the notch of the drum 321. Then, the third drive unit 332 drives the first baffle 331 to move closer to the drum 321, thereby cooperating with the drum 321 to clamp the end of the lower detector. When the drum 321 rotates, the remaining part of the lower detector can rotate along with it on the drum 321.

[0141] The second part mentioned above may also include, in some embodiments, the winding device 300 further includes a second baffle 333, fixed to the fixing plate 310, the second baffle 333 and the first baffle 331 being spaced apart along a first direction, the second baffle 333 being used to sleeve on the drum 321 so that when the drum 321 moves away from the first baffle 331 with the moving plate 320, a portion of the detectors wound on the drum 321 are disengaged from the drum 321.

[0142] Specifically, the second baffle 333 is mainly set up so that the lower section detector after winding is pushed out from the drum 321. The specific process can be that the first drive unit 326 drives the drum 321 on the moving plate 320 to move away from the first baffle 331. During the movement, the drum 321 can pass through the through hole on the second baffle 333, while the lower section detector after winding is blocked by the second baffle 333. That is, the lower section detector after winding is detached from the drum 321 so that it can fall into the high-temperature container 800 below.

[0143] The third part may be, as shown in Figure 15, in some embodiments, the coiling device 300 further includes a sliding plate 340, a fourth drive unit 341, and a clamping assembly 342. The sliding plate 340 is disposed on the fixed plate 310 via a third slide rail 343; the fourth drive unit 341 is disposed on the fixed plate 310 and connected to the sliding plate 340, and is used to drive the sliding plate 340 to reciprocate along a first direction; the clamping assembly 342 is disposed on the fixed plate 310 and is used to clamp part of the detector.

[0144] Specifically, the clamping assembly 342 applies a constraint force to the lower detector section. On the one hand, it serves as a guide, facilitating the winding of the lower detector section onto the drum 321. On the other hand, the constraint force applied by the clamping assembly 342, in conjunction with the winding of the drum 321, ensures that the lower detector section is neatly wound onto the drum 321, improving the dimensional accuracy of the winding of the lower detector section and facilitating subsequent storage in the high-density container 800. The fourth drive unit 341 not only drives the clamping assembly 342 to move along with the winding process of the drum 321, i.e., ensuring that the clamped lower detector section corresponds to the winding position of the drum 321; but also drives the sliding plate 340 and its clamping assembly 342 to avoid obstacles, i.e., ensuring the accurate drop of the lower detector section after winding from above.

[0145] The specific structure of the clamping assembly 342 can be as shown in Figures 13 and 15. In some embodiments, the clamping assembly 342 includes a first clamping roller 3421, a second clamping roller 3422, and a fifth driving part 3423. The first clamping roller 3421 is fixed to the sliding plate 340, and the fifth driving part 3423 is disposed on the sliding plate 340. The output end of the fifth driving part 3423 is connected to the second clamping roller 3422. The fifth driving part 3423 is used to drive the second clamping roller 3422 to move along the first direction to get closer to or away from the first clamping roller 3421.

[0146] Specifically, the first clamping roller 3421 and the second clamping roller 3422 are provided with multiple guide grooves. By clamping the lower section detector with the first clamping roller 3421 and the second clamping roller 3422, the movement of the lower section detector can be limited. In the initial state, the first clamping roller 3421 and the second clamping roller 3422 are set separately. After the clamping assembly carries the lower section detector between the first clamping roller 3421 and the second clamping roller 3422, the fifth driving unit 3423 drives the second clamping roller 3422 to move until the second clamping roller 3422 cooperates with the first clamping roller 3421 to effectively clamp the lower section detector.

[0147] It should be noted that the clamping force of the first clamping roller 3421 and the second clamping roller 3422 on the lower detector is only to apply a certain constraint force. It is also necessary to ensure that the lower detector can move between the first clamping roller 3421 and the second clamping roller 3422 so that the upper drum 321 can wind the lower detector.

[0148] The fourth part may be, as shown in Figure 16, in some embodiments, the coiling device 300 further includes a support frame 350, a sixth drive unit 351, and a guide cylinder 352. The support frame 350 is mounted on the fixed plate 310 via a fourth slide rail 353. The support frame 350, the moving plate 320, and the sliding plate 340 are arranged sequentially along a second direction, which intersects with the first direction. The sixth drive unit 351 is disposed between the fixed plate 310 and the support frame 350, and is used to drive the support frame 350 to move along the first direction. The guide cylinder 352 is mounted on the support frame 350 via a fifth slide rail. The guide cylinder 352 has an inlet 3521 and can move along the second direction under the drive of the seventh drive unit 356 to receive a portion of the detector falling from the second baffle 333.

[0149] Specifically, since the positions of the high-frequency amplifier containers 800 are relatively fixed and there are many of them, not all of the high-frequency amplifier containers 800 are located at the drop-off position of the lower detector after coiling. Based on this, a guide cylinder 352 is provided below the drop-off position. The guide cylinder 352 can move along the second direction (vertical direction) under the drive of the seventh drive unit 356. After the lower detector is coiled and the clamping assembly 342 above has cleared the way, the guide cylinder 352 is driven by the seventh drive unit 356 to a position close to the drop-off position of the lower detector (close to the space between the first baffle 331 and the second baffle 333) to receive the coiled lower detector.

[0150] In some embodiments, the guide tube 352 extends along a second direction, and the guide tube 352 further includes an outlet 3522, and a buffer plate 354 is disposed between the inlet 3521 and the outlet 3522. The buffer plate 354 is used to switch between an open state and a closed state. In the open state, the inlet 3521 communicates with the outlet 3522. In the closed state, the buffer plate 354 is used to buffer a portion of the detector entering from the inlet 3521.

[0151] Specifically, the guide cylinder 352 needs to transport the received reel-up detector to the corresponding high-frequency amplifier container 800. That is, the guide cylinder 352 is moved downward and horizontally by controlling the seventh drive unit 356 and the sixth drive unit 351. During this process, the guide cylinder 352 needs to carry the detector. Therefore, a buffer plate 354 needs to be set inside the guide cylinder 352. During the movement of the guide cylinder 352, the buffer plate 354 is in a closed state, which allows the detector to remain inside the guide cylinder 352. When the guide cylinder 352 moves into position, that is, after it is aligned with the high-frequency amplifier container 800, the motor connected to the buffer plate 354 can be controlled to drive the buffer plate 354 to open, so that the detector located at the buffer plate 354 slides out from the outlet 3522 of the guide cylinder 352 and falls into the high-frequency amplifier container 800.

[0152] At this point, the basic structure of the winding device 300 has been introduced. It should be noted that when the winding device 300 starts winding the lower section of the detector, after winding a preset number of turns, the winding device 300 can be driven to move downwards to a safe underwater depth position. This ensures safe winding while also avoiding interference between the bottom of the longer lower section of the detector and the bottom of the pool.

[0153] Referring to Figures 18 and 19, Figure 18 is a schematic diagram of the overall structure of a demolition platform provided according to some embodiments of this application. Figure 19 is a schematic diagram of the demolition platform from another perspective according to some embodiments of this application. In some embodiments, the demolition platform 400 includes a bridge assembly 410, a plurality of maintenance platforms 420, and a plurality of cage assemblies 430. The bridge assembly 410 surrounds the opening of the component pool 700; the plurality of maintenance platforms 420 are connected to the inner side of the bridge assembly 410 in the circumferential direction and are located above the component pool 700 for shielding the maintenance and operation of the transfer equipment 100 and the lifting assembly 500; the plurality of cage assemblies 430 are connected to the inner side of the bridge assembly 410 in the circumferential direction and are located above the component pool 700 for disassembling the detector; the plurality of cage assemblies 430 and the plurality of maintenance platforms 420 are arranged sequentially at intervals around the circumference of the bridge assembly 410; wherein, the shearing assembly and the hanging frame assembly are disposed on the bridge assembly 410.

[0154] Understandably, when performing corresponding operations via the dismantling platform 400, the dismantling platform 400 is installed at the opening of the component pool 700. Workers then reach the maintenance platform 420 via the bridge assembly 410. Since the maintenance platform 420 is circumferentially connected to the inner side of the bridge assembly 410 and located above the component pool 700, workers can stand on the maintenance platform 420 to perform emergency maintenance and operations on the aforementioned shielding transfer equipment 100, lifting assembly 500, and coiling equipment 300. Subsequently, they reach the cage assembly 430 via the beam-bridge assembly. Since the cage assembly 430 is circumferentially connected to the inner side of the bridge assembly 410 and located above the component pool 700, workers can stand on the cage assembly 430 to approach the detector. This allows them to connect the upper end (clamp) of the detector to the lifting ring in the shielding transfer equipment 100, and release the detector from the shielding transfer equipment 100. The detector is then cut using the shearing assembly, facilitating various operations by workers on the corresponding positions of the internal components of the upper reactor. Multiple workers can also stand in turn at their respective work positions on the demolition platform 400 to carry out synchronous operations, thereby improving work efficiency.

[0155] In some embodiments, the upper reactor component 600 of the nuclear reactor is provided with a plurality of guide rods 610 evenly arranged around the component pool 700 in the circumferential direction; the dismantling platform 400 also includes a plurality of stabilizing platforms 440 and a plurality of stabilizing components 441 corresponding one-to-one with the plurality of guide rods 610; the stabilizing platform 440 is connected to the inner side of the bridge component 410 in the circumferential direction and is located above the component pool 700, and the stabilizing component 441 is disposed on the corresponding stabilizing platform 440, with one end of the stabilizing component 441 extending into the component pool 700 and connected to the corresponding guide rod 610.

[0156] Specifically, four of each of the following components can be provided: guide rod 610, stabilizing component 441, stabilizing platform 440, cage assembly 430, and maintenance platform 420. The stabilizing component 441 is positioned above the component pool 700 via the stabilizing platform 440. Alternatively, the stabilizing component 441 can be placed directly outside the stabilizing platform 440, or a through hole can be opened at the bottom of the stabilizing platform 440. The stabilizing component 441 is connected to the stabilizing platform 440 and extends into the component pool 700 through the through hole, connecting to the guide rod 610. By connecting multiple guide rods 610 with multiple stabilizing components 441, the components inside the upper stack can remain stable and will not tip over. This makes emergency maintenance and operation of the shielded transfer equipment 100, as well as operations such as disassembly and shearing of detectors, more stable.

[0157] Specifically, the bridge component 410 has a connecting platform extending horizontally toward the axis of the component pool 700. The connecting platform has a connecting slot along the direction of the bridge component 410. The connecting slot extends along the direction of the corresponding beam. The stabilizing platform 440 has a hanging protrusion near the connecting platform. The hanging protrusion is inserted into the connecting slot, so that the stabilizing platform 440 and the bridge component 410 form a cantilever beam structure, thereby realizing the detachable connection between the stabilizing platform 440 and the bridge component 410.

[0158] Specifically, the maintenance platform 420 includes: a ladder, a protective cage, an upper platform, multiple legs, and multiple reinforcing beams. The multiple legs are connected to the bridge assembly 410. The two ends of the reinforcing beams are connected to two adjacent legs respectively. The upper platform is connected to the multiple legs. The protective cage is connected to the upper platform. One end of the ladder is connected to the bridge assembly 410, and the other end is connected to the protective cage, so that workers can climb from the bridge assembly 410 to the protective cage. The top of the cage assembly 430 is connected to the bridge assembly 410.

[0159] This application also provides a method for recovering a detector assembly, applied to the nuclear reactor detector assembly recovery system in the above embodiments. Figure 20 is a flowchart illustrating a method for recovering a detector assembly according to some embodiments of this application. As shown in Figure 20, the recovery method may include:

[0160] Step S101: Install the shielded transfer device 100, guide rail assembly 200, lifting assembly 500, coiling device 300, dismantling platform 400, hanging bracket assembly, shearing assembly and clamping assembly at the corresponding positions in the component pool 700.

[0161] Step S102: Control the shielding transfer device 100 to extend below the liquid surface of the component pool 700, and pull out and lift the detector into the shielding tube 110;

[0162] Step S103: Control the shielded transfer device 100 to move out of the liquid surface of the component pool 700, move it to the bracket assembly of the dismantling platform 400, and then extend it back into the liquid surface of the component pool 700 while releasing the detector.

[0163] Step S104: Suspend the detector on the bracket assembly and cut the detector to split it into an upper detector section and a lower detector section.

[0164] Step S105: The lower section detector is wound up using the winding device 300, and the high-frequency amplification container 800 is controlled to receive the wound lower section detector.

[0165] It is understood that in step S101, the installation of the shielded transfer device 100, guide rail assembly 200, lifting assembly 500, coiling device 300, hanging frame assembly, shearing assembly, and clamping assembly can be understood with reference to the above embodiments, and will not be repeated here. Regarding the installation of the dismantling platform 400, step S101 also includes: step S1011, surrounding the opening of the component pool 700 with the bridge assembly 410, and connecting the multiple maintenance platforms 420 and multiple cage assemblies 430 to the bridge assembly 410; step S1012, connecting the multiple stabilizing assemblies 441 on the dismantling platform 400 to the multiple guide rods 610 on the upper reactor component 600 of the nuclear reactor one by one. Specifically,

[0166] Specifically, the dismantling platform 400 can be accessed through the equipment hatch by a transport vehicle. Four maintenance platforms 420 are installed in front of the equipment hatch and hoisted above the component pool 700. After the dismantling platform 400 is fixedly installed, four stabilizing components 441 (lifting sleeves) are connected to the four guide rods 610 of the upper reactor component 600. In this example, the bridge assembly 410, multiple maintenance platforms 420, multiple cage assemblies 430, and the bridge assembly 410 are positioned at the pool opening to facilitate the installation and connection of the detector clamps. The mounting brackets facilitate the temporary storage of the detectors, as well as the cutting and clamping of the detectors. Long-pole tool racks are also included to enable the opening and closing of the high-level radioactive container 800 and its hoisting, as well as other emergency operations.

[0167] In some embodiments, step S102 includes: step S1021, removing the protective shell on the top of the detector and installing the clamp; step S1022, using a transfer mechanism to move the shielding tube 110 above the detector to be pulled out, and reinforcing the pull-out assembly 120 with the clamp; step S1023, driving the shielding tube 110 below the liquid surface, and starting the hoisting assembly 130 to drive the transmission bar to lift the pull-out assembly 120 until the detector is completely inside the shielding tube 110.

[0168] Specifically, the shielding transfer equipment 100 is introduced through the equipment hatch and transported by a transport vehicle to the nuclear island plant. The lower cylinder can be flipped to a vertical position using specialized lifting equipment and hoisted to a support base. The upper cylinder can then be flipped to a vertical position, and the connection between the upper and lower cylinders can be completed using scaffolding and other means.

[0169] The dismantling process for the detectors can be as follows: Workers on the dismantling platform 400 remove the protective shell from each detector and install clamps on each detector; the shielding transport assembly is hoisted above the detector to be removed; the winch assembly 130 lowers the extraction assembly 120 outside the shielding tube 110, and manual operation secures the extraction assembly 120 to the clamps; the shielding tube 110 is lowered to cover the detector and continues to descend until it is at a predetermined distance below the water surface, while the extraction assembly 120 is raised. During this process, the operators need to evacuate the dismantling platform 400. When the winch assembly 130 raises the extraction assembly 120 to its initial position, the detector is pulled out; the hoisting ring is raised to a safe hoisting height above the water surface by lifting the shielding tube 110, at which point the detector is completely removed.

[0170] In some embodiments, step S103 includes: step S1031, moving the shield tube 110 out of the water surface by the transfer mechanism and moving it to the hanger assembly; step S1032, driving the shield transfer device 100 to re-enter the liquid surface, and simultaneously activating the winch assembly 130 to release the transmission bar so that the detector is detached from the shield tube 110; step S1033, driving the shield transfer device 100 to rise, removing the extraction assembly 120 and the clamp, and suspending the clamp on the hanger assembly.

[0171] Specifically, the shielded transport device 100 is moved to the vicinity of the hanger assembly, the shielded tube 110 is lowered to below the water surface, for example, 1.5 meters, the pull-out assembly 120 is lowered to its lower travel limit, and simultaneously the shielded tube 110 is raised until the detector's clamp is exposed above the water surface. The operator separates the clamp from the pull-out assembly 120 and hangs the detector on the hanger assembly. This process is repeated until all detectors are removed.

[0172] In some embodiments, step S105 includes: step S1051, transferring the cut lower segment detector to the clamping assembly 342 via the clamping assembly, extending the end of the lower segment detector between the first baffle 331 and the drum 321, and driving the first baffle 331 closer to the drum 321 via the third driving unit 332 to clamp the lower segment detector; step S1052, activating the second driving unit 322 to drive the drum 321 to rotate, thereby winding the lower segment detector onto the drum 321, and winding a preset number of turns. After a certain number of steps, the control coiling device 300 moves down a preset distance; in step S1053, after the drum 321 and clamping assembly 342 have finished coiling the lower section detector, the clamping assembly 342 moves to avoid it; in step S1054, the guide cylinder 352 is positioned between the first baffle 331 and the second baffle 333 under the drive of the seventh drive unit 356, and the control drum 321 moves away from the second baffle 333. The guide cylinder 352 receives the lower section detector that falls off from the drum 321 and transports the lower section detector into the high-temperature container 800.

[0173] Specifically, the specific structure of the coiling equipment 300 can be understood by referring to the above example, and will not be repeated here. The coiling equipment is introduced from the equipment hatch and transported to the nuclear island plant by a transport vehicle; the support platform 210 is hoisted to the side of the component pool 700 for fixed installation, and the track structure 220 is connected to the support platform 210; the coiling equipment 300 is hoisted onto the support platform 210 to complete the installation and is then debugged.

[0174] The operator clamps the lower section of the detector onto the clamping tool on the dismantling platform 400. Using the shearing assembly on the dismantling platform 400, the detector is cut at the point where its diameter changes. The cut lower section is then transferred to the clamping assembly 342 of the underwater winding device 300, and the end of the lower section is inserted into the reel 321. The reel 321 begins winding the detector. During winding, the winding device 300 descends to a depth of 2 meters. Once winding of a single detector is complete, the winding device 300 descends to a depth of 7 meters. The reel 321 moves relative to the second baffle 333, causing the wound detector to fall into the guide cylinder 352. The guide cylinder 352 moves above the high-altitude release container 800. After the temporary storage plate is opened, the detector falls into the high-altitude release container 800. The winding device 300 is then raised to the surface. The above operations are repeated until the detector winding is complete.

[0175] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0176] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A nuclear reactor detector assembly recovery system, characterized in that, The nuclear reactor detector assembly recovery system includes: a shielded transfer device for removing the detector from the nuclear reactor and transferring it to a preset location; a coiling device, mounted on a guide rail assembly and moved below the liquid surface of the component pool by a lifting assembly, the coiling device being used to coil up part of the detector; and a dismantling platform, located at the opening of the component pool, the dismantling platform supporting a hanging frame assembly, a shearing assembly, and a clamping assembly. The hanging frame assembly is located on one side of the coiling device and is used to temporarily store the detector released by the shielded transfer device. The shearing assembly is used to shear the detector suspended from the hanging frame assembly and located at the preset location. The detector, the clamping assembly for clamping the cut portion of the detector and moving it to the coiling device; the dismantling platform includes: a bridge assembly surrounding the opening of the component pool; wherein, the shearing assembly and the hanging frame assembly are disposed on the bridge assembly; the detector is configured to be moved out of the liquid surface of the component pool by the shielded transfer device, moved to the hanging frame assembly of the dismantling platform, and then submerged again below the liquid surface of the component pool, while releasing the detector; and the detector is suspended on the hanging frame assembly and sheared to split the detector into an upper detector segment and a lower detector segment.

2. The nuclear reactor detector assembly recovery system according to claim 1, characterized in that, The nuclear reactor detector assembly recovery system further includes: a high-temperature container, located below the reeling equipment and below the liquid surface of the component pool, for receiving a portion of the detector after it has been reeled by the reeling equipment.

3. The nuclear reactor detector assembly recovery system according to claim 2, characterized in that, The shielded transfer device includes: a shielded tube body having a cavity for accommodating the detector; and a transfer mechanism for moving the shielded tube body.

4. The nuclear reactor detector assembly recovery system according to claim 3, characterized in that, The shielded transfer device further includes: a pull-out assembly disposed within the cavity, the lower end of which is used to connect to the detector; a winch assembly disposed outside the shielded tube, which is connected to the pull-out assembly via a transmission bar; and a guide assembly disposed at the upper end of the cavity, used to wind around the transmission bar so that the transmission bar enters the cavity from the winch assembly.

5. The nuclear reactor detector assembly recovery system according to claim 4, characterized in that, The hoisting assembly includes a motor, the drive bar includes a rope, and the motor is used to wind up or release the rope.

6. The nuclear reactor detector assembly recovery system according to any one of claims 1-5, characterized in that, The guide rail assembly includes a support platform and a track structure. The support platform is fixed to the edge of the component pool. The upper end of the track structure is connected to the support platform, and the lower end of the track structure abuts against the bottom of the component pool. The lifting assembly is disposed on the support platform and is connected to the winding equipment through a pull bar to drive the winding equipment to move up and down.

7. The nuclear reactor detector assembly recovery system according to any one of claims 1-5, characterized in that, The winding device includes: a fixed plate slidably connected to the guide rail assembly; a movable plate disposed on the fixed plate via a first slide rail; a first driving unit disposed between the movable plate and the fixed plate for driving the movable plate to move along a first direction; a drum for winding a portion of the detector; and a second driving unit disposed on the movable plate, connected to the end of the drum, for driving the drum to rotate.

8. The nuclear reactor detector assembly recovery system according to claim 7, characterized in that, The winding device further includes: a first baffle, which is disposed on the fixed plate via a second slide rail, and the first baffle is located at the end of the drum; and a third driving unit, which is disposed on the fixed plate and connected to the first baffle, the third driving unit being used to drive the first baffle to move along the first direction so as to abut the first baffle against the end of the drum or away from the end of the drum.

9. The nuclear reactor detector assembly recovery system according to claim 8, characterized in that, The winding device further includes: a second baffle fixed to the fixed plate, the second baffle and the first baffle being spaced apart along the first direction, the second baffle being sleeved on the drum so that when the drum moves away from the first baffle along with the moving plate, the portion of the detector wound on the drum is disengaged from the drum.

10. The nuclear reactor detector assembly recovery system according to claim 9, characterized in that, The winding device further includes: a sliding plate, which is mounted on the fixed plate via a third slide rail; a fourth driving unit, which is mounted on the fixed plate and connected to the sliding plate, for driving the sliding plate to reciprocate along a first direction; and a clamping assembly, which is mounted on the fixed plate and is used to clamp part of the detector.

11. The nuclear reactor detector assembly recovery system according to claim 10, characterized in that, The clamping assembly includes a first clamping roller, a second clamping roller, and a fifth driving unit. The first clamping roller is fixed to the sliding plate, and the fifth driving unit is disposed on the sliding plate. The output end of the fifth driving unit is connected to the second clamping roller. The fifth driving unit is used to drive the second clamping roller to move along a first direction to move closer to or further away from the first clamping roller.

12. The nuclear reactor detector assembly recovery system according to claim 11, characterized in that, The winding device further includes: a support frame, which is mounted on the fixed plate via a fourth slide rail; the support frame, the moving plate, and the sliding plate are arranged sequentially along a second direction, which intersects with the first direction; a sixth driving unit, disposed between the fixed plate and the support frame, for driving the support frame to move along the first direction; and a guide cylinder, which is mounted on the support frame via a fifth slide rail, has an inlet, and can move along the second direction under the drive of the seventh driving unit to receive a portion of the detector falling from the second baffle.

13. The nuclear reactor detector assembly recovery system according to claim 12, characterized in that, The guide tube extends along the second direction, and the guide tube also includes an outlet. A buffer plate is provided between the inlet and the outlet. The buffer plate is used to switch between an open state and a closed state. In the open state, the inlet is connected to the outlet. In the closed state, the buffer plate is used to buffer a portion of the detector entering from the inlet.

14. The nuclear reactor detector assembly recovery system according to any one of claims 1-5 and 8-13, characterized in that, The dismantling platform includes: multiple maintenance platforms connected to the inner side of the bridge component in the circumferential direction and located above the component pool, used for the maintenance and operation of the shielding transfer equipment and lifting components; multiple cage assemblies connected to the inner side of the bridge component in the circumferential direction and located above the component pool, used for disassembling the detector; the multiple cage assemblies and the multiple maintenance platforms are arranged sequentially at intervals around the circumference of the bridge component.

15. The nuclear reactor detector assembly recovery system according to claim 14, characterized in that, The upper reactor component of the nuclear reactor is provided with a plurality of guide rods evenly arranged around the circumference of the component pool; the dismantling platform also includes a plurality of stabilizing platforms and a plurality of stabilizing components corresponding one-to-one with the plurality of guide rods; the stabilizing platform is connected to the inner side of the bridge component in the circumference and is located above the component pool, the stabilizing component is disposed on the corresponding stabilizing platform, and one end of the stabilizing component extending into the component pool is connected to the corresponding guide rod.

16. A method for recovering a detector assembly, applied to the nuclear reactor detector assembly recovery system according to any one of claims 1-15, characterized in that, The recovery method includes: installing the shielded transfer device, guide rail assembly, lifting assembly, coiling device, dismantling platform, hanging bracket assembly, shearing assembly, and clamping assembly at corresponding positions in the component pool; controlling the shielded transfer device to extend below the liquid surface of the component pool and pull out and lift the detector into the shielding tube; controlling the shielded transfer device to move out of the liquid surface of the component pool, move to the hanging bracket assembly of the dismantling platform, and extend below the liquid surface of the component pool again, while releasing the detector; suspending the detector on the hanging bracket assembly and shearing the detector to split the detector into an upper detector segment and a lower detector segment; using the coiling device to coil the lower detector segment, and controlling the high-temperature discharge container to receive the coiled lower detector segment.

17. The method for recovering the detector assembly according to claim 16, characterized in that, The step of installing the dismantling platform at the component pool includes: surrounding the pool opening with a bridge assembly and connecting multiple maintenance platforms and multiple cage assemblies to the bridge assembly; and connecting multiple stabilization components on the dismantling platform to multiple guide rods on the upper reactor components of the nuclear reactor one by one.

18. The method for recovering the detector assembly according to claim 17, characterized in that, The steps of controlling the shielding transfer device to extend below the liquid surface of the component pool and to pull out and lift the detector into the shielding tube include: removing the protective shell on the top of the detector and installing a clamp; using a transfer mechanism to move the shielding tube above the detector to be pulled out and to securely connect the extraction assembly to the clamp; driving the shielding tube below the liquid surface and activating the winch assembly to drive the transmission bar to lift the extraction assembly until the detector is completely inside the shielding tube.

19. The method for recovering the detector assembly according to claim 18, characterized in that, The steps of controlling the shielding transfer device to move out of the liquid surface of the component pool, move to the hanging assembly of the dismantling platform, and then extend back into the liquid surface of the component pool while releasing the detector include: using the transfer mechanism to move the shielding tube out of the water surface and to the hanging assembly; driving the shielding transfer device back into the liquid surface while simultaneously activating the winch assembly to release the transmission bar, so that the detector is detached from the shielding tube; driving the shielding transfer device to rise, removing the extraction assembly and the clamp, and suspending the clamp on the hanging assembly.

20. The method for recovering the detector assembly according to claim 19, characterized in that, The steps of using a coiling device to coil the lower detector segment include: transferring the cut lower detector segment to the clamping assembly via a clamping component, extending the end of the lower detector segment between the first baffle and the drum, and driving the first baffle to approach the drum via a third drive unit to clamp the lower detector segment; activating the second drive unit to rotate the drum, thereby winding the lower detector segment onto the drum, and after winding a preset number of turns, controlling the coiling device to move downwards a preset distance; after the drum, in conjunction with the clamping assembly, has coiled the lower detector segment, the clamping assembly moves to avoid it, and the guide cylinder, driven by the seventh drive unit, is positioned between the first baffle and the second baffle, controlling the drum to move away from the second baffle; the guide cylinder receives the lower detector segment that has fallen off the drum and transports the lower detector segment into the high-exposure container.

Images