Shielding device and recovery system of nuclear reactor detector assembly

Abstract

The utility model relates to a shielding device and recovery system for a nuclear reactor detector assembly, and the shielding device comprises a shielding pipe body which is provided with a pipe cavity, and the pipe cavity is used for accommodating a high-level radioactive detector; the driving assembly is arranged outside the shielding pipe body; the pulling assembly is arranged in the tube cavity, one end of the pulling assembly is connected with the driving assembly through a traction strip, and the other end of the pulling assembly is used for being connected with a high-level radiometric detector; the pulling assembly is driven by the driving assembly to move in the axial direction of the shielding tube body so that the high-level detector can be contained in the tube cavity or the high-level detector can be discharged out of the tube cavity. The structure design is ingenious, safe transfer of the high-level radioactive detector is achieved, radiation can be effectively shielded through the shielding pipe body, and operators and the surrounding environment are protected.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of reactor equipment dismantling, in particular to a shielding device and a recovery system for a nuclear reactor probe assembly. BACKGROUND

[0002] The core measurement system includes core temperature measurement, core neutron injection rate measurement and water level measurement in the pressure vessel, and directly provides the reactor fuel assembly coolant outlet temperature information, the core neutron injection rate distribution information and the water level information in the pressure vessel. At present, the reactor core measurement system in the related art adopts an integrated assembly form, integrates the probe into one, that is, the probe assembly is inserted from above the reactor pressure vessel cover, is sent into the fuel assembly, and the measurement function is realized.

[0003] During the operation of the reactor, the integrated assembly of the core measurement system is always located in the pressure vessel, and the bottom is always in the fuel assembly, which is greatly affected by radiation for a long time. Since the design service life of the core measurement system is short, it cannot be guaranteed that the nuclear power plant will not be replaced throughout the life cycle, so the probe integrated assembly near the service life needs to be removed and replaced during refueling.

[0004] According to the design of the guide cylinder of the core measurement system in the upper internal structure and the depth limitation of the component pool, the probe integrated assembly will inevitably be exposed to the water surface when it is pulled out and removed. The used probe integrated assembly is a high-level radioactive object, and the radioactive dose distribution is uneven at different positions; the dose of the part located in the fuel assembly during operation is very high, and this part needs to be considered for radiation protection during the removal process.

[0005] At present, there is little research on special equipment for high-level probe water transport, therefore, it is urgent to design a transfer equipment to realize the pulling out, safe transport and other operations of the high-level probe. Practical new type content

[0006] Based on this, the embodiment of the present application provides a shielding device and a nuclear reactor probe assembly recovery system for a nuclear reactor probe assembly, which realizes the safe transport of the high-level probe, and the shielding pipe body can effectively shield radiation and protect the operating personnel and the surrounding environment.

[0007] The first aspect of the embodiment of the present application provides a shielding device for a nuclear reactor probe assembly of a high-level probe, which is used for transport operation of the high-level probe, and the shielding device comprises:

[0008] A shielding pipe body, the shielding pipe body has a lumen, and the lumen is used for accommodating the high-level probe; the shielding pipe body comprises a first cylinder body and a second cylinder body connected to each other, and the thickness of the cylinder wall of the second cylinder body is greater than that of the first cylinder body;

[0009] The second cylinder is provided with a cylinder opening at one end away from the first cylinder, and the cylinder opening is used for the high-level detector to pass through to enter the lumen;

[0010] A driving assembly is arranged outside the shielding pipe body;

[0011] A pulling assembly is arranged in the lumen, one end of the pulling assembly is connected with the driving assembly through a pulling strip, and the other end is used for connecting the high-level detector;

[0012] The pulling assembly is driven by the driving assembly to move along the axial direction of the shielding pipe body to accommodate the high-level detector into the lumen or release the high-level detector from the lumen.

[0013] In one of the embodiments, a bearing platform is arranged on the outer wall surface of the first cylinder close to the second cylinder, and the driving assembly is fixed on the bearing platform.

[0014] In one of the embodiments, the shielding device further comprises a guide assembly arranged at the top of the shielding pipe body, and the guide assembly is used for winding the pulling strip to enter the lumen from the driving assembly.

[0015] In one of the embodiments, the guide assembly comprises a bracket and a guide wheel, the guide wheel is rotatably arranged on the bracket, and the pulling strip is wound on the guide wheel.

[0016] In one of the embodiments, the guide assembly further comprises a weighing sensor arranged on the bracket, and the weighing sensor is used for acquiring the force value of the pulling strip in real time.

[0017] In one of the embodiments, the driving assembly comprises a winch, and the pulling strip comprises a rope, and the winch is used for winding or releasing the rope.

[0018] In one of the embodiments, the pulling assembly comprises a counterweight, and the counterweight is adapted to be embedded in the lumen;

[0019] One end of the counterweight away from the pulling strip is provided with a connecting piece, and the connecting piece is used for detachably connecting the high-level detector.

[0020] In one of the embodiments, the connecting piece comprises a lifting ring, one end of the lifting ring is fixedly connected with the counterweight, and the other end is used for connecting with a counterpart connected with the high-level detector.

[0021] The second aspect of the embodiment of the application provides a nuclear reactor detector assembly recovery system, which comprises the shielding device of the nuclear reactor detector assembly in the above-mentioned embodiments.

[0022] A ring lifting device is detachably connected with the shielding device;

[0023] A control device is in communication connection with the ring lifting device and the driving assembly respectively, so as to control the ring lifting device to drive the shielding device to move, and control the driving assembly to drive the pulling strip to drive the pulling assembly to receive the high-level probe into the lumen or to release the high-level probe from the lumen.

[0024] The shielding device of the nuclear reactor probe assembly and the nuclear reactor probe assembly recovery system provided by the present application provide a shielding space for the high-level probe by constructing a through lumen in the shielding pipe body, so as to reduce the radiation influence; and the driving assembly is installed outside the shielding pipe body, and the pulling assembly is located in the lumen, both of which are connected through the pulling strip, when the driving assembly operates, the pulling strip can be pulled, and then the pulling assembly is driven to move along the axial direction in the shielding pipe body; after the pulling assembly is connected with the high-level probe, the high-level probe can be pulled into the lumen to be received, and vice versa, the high-level probe can be released from the lumen to complete the transfer operation. The shielding device has a clever structure design, realizes the safe transfer of the high-level probe, the shielding pipe body can effectively shield the radiation, and the operating personnel and the surrounding environment are protected; in addition, the cooperative operation of the driving assembly and the pulling assembly makes the transfer operation of the high-level probe more convenient and efficient. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 Part of the structure schematic diagram of the nuclear reactor probe assembly recovery system provided according to some embodiments of the present application.

[0026] Figure 2 Part of the structure schematic diagram of the nuclear reactor probe assembly recovery system (including the control device) provided according to some embodiments of the present application.

[0027] Figure 3 The connection structure schematic diagram of the ring lifting device and the shielding device of the nuclear reactor probe assembly provided according to some embodiments of the present application.

[0028] Figure 4 The overall structure schematic diagram of the shielding device of the nuclear reactor probe assembly provided according to some embodiments of the present application.

[0029] Figure 5 The cross-sectional structure schematic diagram of the shielding device of the nuclear reactor probe assembly provided according to some embodiments of the present application.

[0030] Figure 6 The local cross-sectional structure schematic diagram of the pulling assembly and the shielding pipe body provided according to some embodiments of the present application.

[0031] Figure 7 An enlarged structural schematic view of a driving assembly according to some embodiments of the present application.

[0032] Figure 8 An enlarged structural schematic view of a guiding assembly according to some embodiments of the present application.

[0033] Reference Signs:

[0034] 10, ring lifting device; 11, lifting hook; 12, lifting belt; 20, butt joint; 30, instrument shelf; 40, control device; 50, high-level detector; 60, dismantling platform;

[0035] 100, shielding tube body; 101, tube cavity; 110, first cylinder; 120, second cylinder; 121, cylinder mouth;

[0036] 200, driving assembly;

[0037] 300, pulling assembly;

[0038] 500, pulling strip;

[0039] 400, guiding assembly; 410, support; 420, guiding wheel;

[0040] 600, connecting piece;

[0041] 700, lifting frame. DETAILED DESCRIPTION

[0042] In order to make the above objectives, features and advantages of the present application more apparent, specific embodiments of the present application are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be practiced in a number of ways other than those specifically described herein, and the present application is not limited to the specific embodiments described below. It is to be understood that other embodiments can be employed and that structural and functional modifications can be made without departing from the scope of the present application.

[0043] In the description of the present application, it should be understood that if there are terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0044] In addition, if there are these terms "first", "second", these terms are only used for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second" can be explicitly or implicitly included at least one of the features. In the description of the present application, if there are the terms "a plurality of", the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise explicitly specified and limited.

[0045] In the present application, unless otherwise explicitly specified and limited, if there are the terms "mounting", "connecting", "connecting", "fixing" and the like, these terms should be understood in a broad sense. For example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0046] In the present application, unless otherwise explicitly specified and limited, if there are the terms "first" and "second" and the like, the meaning can be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature "above", "above" and "above" of the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" of the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0047] It should be noted that if an element is referred to as "fixed to" or "provided to" another element, it can be directly on another element or there can be a middle element. If an element is considered to be "connected" to another element, it can be directly connected to another element or there can be a middle element. If there is, the terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used in the present application are only for the purpose of description, and do not represent the only implementation.

[0048] In the related art, as shown in Figure 1 and Figure 2 , the Figure 1 is a partial structural schematic diagram of a nuclear reaction detector assembly recovery system provided according to some embodiments of the present application. Figure 2Figure 1 is a schematic diagram of a part of a nuclear reactor assembly recovery system (including a control device) according to some embodiments of the present application. Instrument rack 30 is a part of the upper internals of the reactor, and its main function is to support 46 high level detectors 50. High level detectors 50 are circumferentially distributed on 12 positions on high level detector 50, with 4 or 2 high level detectors 50 at each position. To remove high level detectors 50 at a position, a ring crane is used to transport the shielding device of the nuclear reactor assembly to the corresponding position.

[0049] Referring to Figure 4 and Figure 5 , Figure 4 Figure 2 is a schematic diagram of the overall structure of a shielding device of a nuclear reactor assembly according to some embodiments of the present application. Figure 5 Figure 3 is a schematic diagram of a cross-sectional structure of a shielding device of a nuclear reactor assembly according to some embodiments of the present application. The shielding device of the nuclear reactor assembly for the high level detector 50 provided by an embodiment of the present application is used for the transfer operation of the high level detector 50, and can include a shielding tube body 100, a driving assembly 200, and a pulling assembly 300.

[0050] The shielding tube body 100 has a tube cavity 101 for accommodating the high level detector 50; the driving assembly 200 is arranged outside the shielding tube body 100; the pulling assembly 300 is arranged inside the tube cavity 101, one end of the pulling assembly 300 is connected to the driving assembly 200 through a pulling strip 500, and the other end is used to connect the high level detector 50; wherein the pulling assembly 300 moves along the axial direction of the shielding tube body 100 under the driving of the driving assembly 200, so as to accommodate the high level detector 50 into the tube cavity 101, or to release the high level detector 50 from the tube cavity 101.

[0051] It can be understood that when the high level detector 50 is working, the lower section of the high level detector 50 is inserted into the nuclear reactor fuel assembly. The upper section of the high level detector 50 is farther away from the fuel assembly than the lower section of the high level detector 50. Since the reactor pressure vessel is radioactive, the high level detector 50 will be contaminated and also radioactive. Since the upper section of the high level detector 50 is farther away from the fuel assembly, the radioactivity of the lower section of the high level detector 50 is higher than that of the upper section of the high level detector 50, so generally the lower section of the high level detector 50 and the upper section of the high level detector 50 are recovered separately when the high level detector 50 is recovered.

[0052] Among them, the upper section of the high level detector 50 has less radioactivity and can be stored for recovery elsewhere. The lower section of the high level detector 50 is rolled up to reduce the volume and then recovered. The structure of the rolling device and the recovery method can be understood according to related technologies, and will not be described here.

[0053] For the convenience of walking and operation, a dismantling platform 60 is arranged above the component pool, and a region corresponding to the high-level probe 50 below is left in the middle of the dismantling platform 60, so that the shielding device provided in the example can pull out the high-level probe 50 from the region. The shielding device can be moved in all directions above the component pool through hoisting equipment (ring hoist), and after the shielding tube body 100 enters the water surface below the nuclear reactor to pull out the high-level probe 50, that is, the high-level probe 50 is completely placed in the lumen 101 of the shielding tube body 100, the shielding tube body 100 is separated from the water surface, and then reaches the position of the hanger assembly after passing through the dismantling platform 60. Of course, in order to facilitate the coiling of the high-level probe 50 by the coiling device, the hanger assembly is usually arranged on one side of the coiling device.

[0054] Then, the shielding tube body 100 enters the water surface below, and the shielding tube body 100 is lifted upwards while releasing the high-level probe 50, until the top of the high-level probe 50 is exposed to the water surface. The high-level probe 50 can be hung on the hanger assembly through manual or mechanical arm operation, so as to facilitate subsequent shearing, coiling and other operations of the high-level probe 50.

[0055] In the above process of transporting the high-level probe 50, since the high-level probe 50 is contaminated and radioactive, the pulling-out process and the release process of the high-level probe 50 are carried out underwater, and the high-level probe 50 can be isolated from the external environment by the shielding tube body 100 during the transportation process. Since the lower segment of the high-level probe 50 is located in the fuel assembly during operation, the lower segment of the high-level probe 50 is most contaminated and has the highest radioactivity. The upper segment of the high-level probe 50 is far away from the core, so the closer to the upper end of the high-level probe 50, the smaller the radioactivity. Since the high-level probe 50 is long enough, the end of the high-level probe 50 far away from the core has low radioactivity, and thus the upper end of the high-level probe 50 can be exposed to the water surface, which is convenient for the operator to operate.

[0056] Since the lower segment of the high-level probe 50 has high radioactivity, the lower half of the shielding tube body 100 can be specially treated. For example, high-density materials such as lead, tungsten, depleted uranium, etc. can be used to manufacture the lower half of the shielding tube body 100, or the lower half of the shielding tube body 100 can be designed as a multi-layer structure to improve the radiation protection of the shielding tube body 100 during the water-out transportation process, and to avoid the risk of radiation leakage.

[0057] The shielding tube body 100 provided in the example can be designed as a cylindrical structure, and a lumen 101 is arranged through the inside. The length of the lumen 101 can be greater than the length of the high-level probe 50, so that the bottom of the high-level probe 50 can be completely placed in the shielding tube body 100, and the radiation leakage of the bottom of the high-level probe 50 can be reduced or avoided.

[0058] During the transfer of the high-frequency detector 50, firstly, the pull bar 500 is released by the drive assembly 200. Under the gravity of the pull assembly 300, the pull assembly 300 moves to the lower end of the shielding tube 100 and is exposed, so that the top of the high-frequency detector 50 can be installed on the pull assembly 300 manually or by a robotic arm. Secondly, the pull bar 500 is wound up under the drive of the drive assembly 200. The pull bar 500 can pull the pull assembly 300 up until the high-frequency detector 50 is completely lifted into the cavity 101 of the shielding tube 100. Of course, the high-frequency detector 50 can be lifted up further until the bottom of the high-frequency detector 50 is at a preset distance from the bottom of the shielding tube 100. Subsequently, the shielding tube 100 is moved to a preset position by controlling the hoisting equipment; finally, the drive assembly 200 is controlled to release the pull bar 500 until the top of the high-frequency detector 50 is exposed above the shielding tube 100. The high-frequency detector 50 is then removed from the extraction assembly 300 by manual or robotic arm operation to facilitate subsequent recovery work.

[0059] In this application, a through-cavity 101 is constructed within the shielding tube 100 to provide a shielding space for the high-level radiation detector 50, thereby reducing radiation impact. A drive assembly 200 is installed outside the shielding tube 100, and a pull-out assembly 300 is located inside the cavity 101. The two are connected by a pull bar 500. When the drive assembly 200 operates, it pulls the pull bar 500, thereby causing the pull-out assembly 300 to move axially within the shielding tube 100. After connecting the high-level radiation detector 50, the pull-out assembly 300 can pull it into the cavity 101 for storage; conversely, it can also release the high-level radiation detector 50 from the cavity 101, completing the transfer operation. This shielding device has an ingenious structural design, enabling the safe transfer of the high-level radiation detector 50. The shielding tube 100 effectively shields radiation, protecting operators and the surrounding environment. Furthermore, the coordinated operation of the drive assembly 200 and the pull-out assembly 300 makes the transfer operation of the high-level radiation detector 50 more convenient and efficient.

[0060] Below, we will combine the appendix Figure 1 -Appendix Figure 8 The structure of the shielding device for the nuclear reactor detector assembly of the high-level radioactive detector 50 provided in this application embodiment will be described in detail.

[0061] like Figure 4 and Figure 5 As shown, in some embodiments, the shielding tube 100 includes a first cylinder 110 and a second cylinder 120 connected to each other. The wall thickness of the second cylinder 120 is greater than the wall thickness of the first cylinder 110. The second cylinder 120 has an opening 121 at one end away from the first cylinder 110. The opening 121 is used for the high-frequency detector 50 to pass through and enter the cavity 101.

[0062] Specifically, as described in the above example, the lower section of the high-frequency radioactive detector 50 has stronger radioactivity than the upper section. During the transport of the high-frequency radioactive detector 50, the lower section is located in the lower half of the shielding tube 100, and the upper section is located in the upper half of the shielding tube 100. Therefore, the wall thickness of the lower half of the shielding tube 100, i.e., the second cylinder 120, is greater than the wall thickness of the upper half of the shielding tube 100, i.e., the first cylinder 110. This allows for more reliable shielding of the radioactivity of the lower section of the high-frequency radioactive detector 50, making it safer and more reliable. Meanwhile, the first cylinder 110, while ensuring a certain shielding effect, can reduce the overall weight and cost.

[0063] In addition, the end opening 121 of the second cylinder 120 away from the first cylinder 110 can be understood as the low point of the entire shielding device. During the transfer process, the opening 121 of the second cylinder 120 first contacts the high-frequency detector 50, that is, the high-frequency detector 50 enters the cavity 101 through the opening 121.

[0064] It should be noted that although the wall thicknesses of the first cylinder 110 and the second cylinder 120 are different, their inner diameters are the same. In addition, the first cylinder 110 and / or the second cylinder 120 may be composed of one or more cylinder segments, which is not limited here.

[0065] like Figure 7 As shown, Figure 7 This is an enlarged structural schematic diagram of a drive assembly provided according to some embodiments of this application. In some embodiments, a support platform is provided on the outer wall surface of the first cylinder 110 near the second cylinder 120, and the drive assembly 200 is fixed on the support platform.

[0066] Specifically, the support platform provides a stable installation position for the drive assembly 200, enabling the drive assembly 200 to be firmly installed on the shielding tube 100, ensuring the stability of the drive assembly 200 during operation, and avoiding the impact of shaking or other factors on the operation of the pull-out assembly 300 on the high-frequency detector 50.

[0067] In this example, the configuration of the carrying platform enhances the stability of the connection between the drive component 200 and the shielding tube 100, thereby improving the reliability of the entire shielding device and ensuring the smooth operation of the transfer.

[0068] like Figure 8 As shown, Figure 8 This is an enlarged structural schematic diagram of a guide assembly provided according to some embodiments of this application. In some embodiments, the shielding device further includes a guide assembly 400, which is disposed on the top of the shielding tube 100. The guide assembly 400 is used to wind around the tension strip 500 so that the tension strip 500 enters the cavity 101 from the drive assembly 200.

[0069] Specifically, the top end of the shielding tube body 100 also has an opening for pulling the strip 500 into connection with the pulling assembly 300. A guide assembly 400 is arranged at the top end of the shielding tube body 100 to guide the strip 500 to smoothly enter the lumen 101 from the driving assembly 200. Through the guiding effect of the guide assembly 400 on the strip 500, the movement direction of the strip 500 can be changed, so that the force transmission from the driving assembly 200 to the pulling assembly 300 is more accurate, and problems such as deviation and winding of the strip 500 during movement are avoided.

[0070] The arrangement of the guide assembly 400 in this example improves the accuracy and stability of the movement of the strip 500, ensures the effective transmission of force between the driving assembly 200 and the pulling assembly 300, and enables the pulling assembly 300 to operate the high-level detector 50 more accurately.

[0071] As shown in Figure 8 In some embodiments, the guide assembly 400 includes a bracket 410 and a guide wheel 420, and the guide wheel 420 is rotationally arranged on the bracket 410, and the strip 500 is arranged around the guide wheel 420.

[0072] Specifically, the guide wheel 420 can be understood as a fixed pulley. When the driving assembly 200 pulls the strip 500, the guide wheel 420 rotates, reducing the friction between the strip 500 and the guide assembly 400, and making the movement of the strip 500 more smooth. Not only improves the service life of the strip 500, but also makes the movement of the pulling assembly 300 more stable and efficient.

[0073] In some embodiments, the guide assembly 400 further includes a load cell (not shown in the figure) arranged on the bracket 410, which is used to obtain the force value of the strip 500 in real time.

[0074] Specifically, the load cell is partially fixed on the bracket 410, and the other part needs to be in contact with the strip 500. When the strip 500 is under stress, the force will be transmitted to the sensor component in contact or connected with the strip 500, such as the elastic element of the sensor. The elastic element will deform slightly under the action of force, and the resistance inside the sensor will change, and then output a voltage signal to calculate the force value of the strip 500. The specific principle can be understood according to related technologies, and will not be described here.

[0075] The arrangement of the load cell in this example provides real-time monitoring function for the transfer process, which is convenient for the operator to discover abnormal conditions in time and take corresponding measures to ensure the safety and stability of the transfer of the high-level detector 50.

[0076] As shown in Figure 7As shown, in some embodiments, the driving assembly 200 comprises a winch, and the pulling bar 500 comprises a rope, and the winch is used to wind up or release the rope.

[0077] Specifically, the winch has the advantages of compact structure, convenient operation, and large traction force, and can meet the power demand of pulling the high activity detector 50. The present example provides a reliable power source for the pulling assembly 300 through the combination of the winch and the rope, and the operation is simple and convenient, and the movement speed and force of the pulling assembly 300 can be flexibly controlled to adapt to the transfer demand of the high activity detector 50 under different conditions.

[0078] It should be noted that, in order to obtain the specific position of the high activity detector 50 in the shielding pipe body 100 in real time, the specific position of the pulling assembly 300 in the shielding pipe body 100 needs to be calculated, and the implementation can be that an encoder such as an incremental encoder is arranged on the motor shaft or the winding drum shaft of the winch to ensure that the encoder rotates synchronously with the shaft, and the encoder can transmit data to the control device 40 described below in real time for data processing.

[0079] Of course, during the equipment installation and debugging stage, when the pulling assembly 300 is in the initial position, that is, the starting position for preparing to start lifting or lowering the high activity detector 50, the control device 40 is used to initialize the encoder, and the output signal of the encoder at this time is set as the initial zero position. When the motor of the winch is started to drive the winding drum to wind up or release the rope, and then drive the pulling assembly 300 to move, the encoder will generate a pulse signal with the rotation of the winding drum shaft. The encoder will output a fixed number of pulses every time a certain angle is rotated. The control device 40 collects the number of pulses output by the encoder in real time, and according to the resolution of the encoder (i.e. the number of pulses output per rotation) and the diameter of the winding drum and other parameters, the lifting or lowering distance of the pulling assembly 300 is calculated through a specific calculation formula. The control device 40 feeds back the lifting and lowering distance information of the pulling assembly 300 calculated in real time to the operator, and the operator can intuitively see the position state of the pulling assembly 300 on the control interface, that is, intuitively see the position state of the high activity detector 50.

[0080] As shown, Figure 6 As shown, Figure 6 The present application provides a partial cross-sectional structure schematic diagram of the pulling assembly and the shielding pipe body. In some embodiments, the pulling assembly 300 comprises a counterweight, and the counterweight is embedded in the lumen 101; the end of the counterweight away from the pulling bar 500 is provided with a connecting piece 600, and the connecting piece 600 is used for detachably connecting the high activity detector 50.

[0081] Specifically, the arrangement of the counterweight facilitates the lowering of the pulling assembly 300 to the barrel mouth 121 of the second barrel body 120 to be connected with the high-level probe 50, and the arrangement of the counterweight can make it more stable when moving in the lumen 101, and at the same time, the gravity of the counterweight can assist the pulling assembly 300 in operating the high-level probe 50.

[0082] As shown in Figure 5 and Figure 6 In some embodiments, the connecting piece 600 includes a pull ring, one end of the pull ring is fixedly connected with the counterweight, and the other end is used to be connected with the docking piece 20 connected with the high-level probe 50.

[0083] Specifically, in use, the pull strip 500 is released by the winch, and under the gravity of the counterweight, the pull ring is exposed from the lower end of the shielding tube body 100 (at the barrel mouth 121 of the second barrel body 120) to facilitate manual or mechanical arm installation of the probe on the pull ring or disassembly of the probe from the pull ring. Under the winding of the winch, the pull strip 500 can pull the counterweight to rise, so as to facilitate the lifting of the probe into the shielding tube body 100. The pull ring as the connecting piece 600 simplifies the connection mode of the counterweight and the high-level probe 50, improves the convenience of the transfer operation, and is conducive to quickly completing the transfer work of the high-level probe 50.

[0084] It should be noted that the docking piece 20 is used to directly connect the annular groove end of the high-level probe 50, and the pull ring is used to directly connect with the docking piece 20, so as to realize the pulling of the high-level probe 50.

[0085] The operation process of the shielding device provided in the present application can be: the ring crane hoists the shielding device to the upper side of the high-level probe 50, then the operator stands on the erected operation platform to connect the pull ring with the high-level probe 50, controls the ring crane to lower the height of the shielding device, so that the shielding section of the shielding device enters about 1.5 meters below the water surface. The pulling assembly 300 of the shielding device is controlled to start pulling the high-level probe 50.

[0086] When the high-level probe 50 is completely pulled into the shielding barrel, the ring crane hoists the shielding device to the storage position of the high-level probe 50 at the edge of the component pool, and the shielding section enters about 1.5 meters below the water surface. After the pulling assembly 300 of the shielding device is controlled to descend for 10 meters, the ring crane is controlled to lift the shielding device. After the shielding device completely leaves the water surface, the high-level probe 50 has also completely come out, and at this time, the pull ring of the shielding device also exposes the shielding barrel. The operator stands on the erected operation platform to disconnect the pull ring from the high-level probe 50, and hangs the high-level probe 50 at the designated position.

[0087] The shielding device is continuously hoisted to the upper side of the next high-level probe 50 to start the repeated pulling process.

[0088] As Figure 1 and Figure 2 shown, the embodiment of the present application also provides a nuclear reactor detector assembly recovery system, comprising the shielding device of the nuclear reactor detector assembly in the above embodiment, the ring lifting device 10 and the control device 40.

[0089] The ring lifting device 10 is detachably connected with the shielding device; the control device 40 is used for being communicatively connected with the ring lifting device 10 and the driving assembly respectively, so as to control the ring lifting device 10 to drive the shielding device to move, and control the driving assembly to drive the pulling strip 500 to drive the pulling assembly 300 to store the high-level detector 50 into the lumen 101 or release the high-level detector 50 from the lumen 101.

[0090] It can be understood that, in actual operation, as Figure 3 shown, Figure 3 is a connection structure diagram of the ring lifting device and the shielding device provided according to some embodiments of the present application. The ring lifting device 10 comprises a lifting hook 11 and a lifting belt 12, and the top of the shielding tube body 100 is provided with a lifting frame 700. The connection of the lifting belt 12 and the lifting frame 700 realizes the connection of the ring lifting device 10 and the shielding tube body 100.

[0091] The control device 40 in the present example can be composed of a controller, an industrial computer, a running system, a main operation panel and a remote operation box. The main operation panel has automatic and manual control functions, the running system provides a man-machine interactive interface, is responsible for data display, storage, backup and automatic control instruction sending, and exchanges data with the PLC in the control cabinet through industrial Ethernet, so as to realize the coordination of all devices in the system and control all mechanical devices in the system respectively. The remote operation box can be extended to the vicinity of the mechanical device for operation. In an emergency, the pressing of the emergency stop button of the main operation panel and the remote operation box can make the system stop as soon as possible, reduce the risk of equipment damage and avoid personnel casualties.

[0092] The specific operation process is that the control device 40 controls the ring lifting device 10 to drive the shielding device to move to the position of the high-level detector 50, and then controls the driving assembly to drive the pulling strip 500 to drive the pulling assembly 300 to store the high-level detector 50 into the lumen 101 of the shielding tube body 100, so as to complete the recovery; when the detector needs to be released, the operation of the related components is realized through the control device 40.

[0093] The recovery system integrates various devices, realizes the automatic recovery operation of the high-level detector 50, and improves the recovery efficiency and safety. The setting of the control device 40 makes the whole recovery process more accurate and controllable, and reduces the risk brought by human operation.

[0094] Any combination of the technical features in the above-described embodiments can be made, and for the sake of brevity, not all possible combinations are described, however, it is to be understood that the application embraces all such possible combinations.

[0095] The above-described embodiments only express several implementation manners of the present application, and the description is relatively specific and detailed, but it should not be understood as a limitation on the patent scope of the application. It should be pointed out that for ordinary skilled persons in the art, some modifications and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the patent protection scope of the present application should be subject to the appended claims.

Claims

1. A shielding device for a nuclear reactor detector assembly, characterized by, The shielding device is used for transferring operation of a high-level detector, and the shielding device comprises: a shielding tube body having a tube cavity for accommodating the high-level detector; the shielding tube body comprises a first cylinder and a second cylinder connected to each other, a cylinder wall thickness of the second cylinder is greater than a cylinder wall thickness of the first cylinder; the second cylinder is provided with a cylinder opening at an end away from the first cylinder, and the cylinder opening is used for the high-level detector to pass through to enter the tube cavity; a driving assembly arranged outside the shielding tube body; a pulling assembly arranged in the tube cavity, one end of the pulling assembly is connected with the driving assembly through a pulling strip, and the other end is used for connecting the high-level detector; wherein the pulling assembly moves along an axial direction of the shielding tube body under the driving of the driving assembly to accommodate the high-level detector into the tube cavity or release the high-level detector from the tube cavity.

2. The shielding arrangement for a nuclear reactor detector assembly of claim 1, wherein, A bearing platform is arranged on an outer wall surface of the first cylinder close to the second cylinder, and the driving assembly is fixed on the bearing platform.

3. The shielding arrangement for a nuclear reactor detector assembly of claim 1, wherein, The shielding device further comprises a guide assembly arranged at a top of the shielding tube body, and the guide assembly is used for winding the pulling strip to enter the tube cavity from the driving assembly.

4. The shielding arrangement for a nuclear reactor detector assembly of claim 3, wherein, The guide assembly comprises a bracket and a guide wheel rotatably arranged on the bracket, and the pulling strip is wound on the guide wheel.

5. The shielding arrangement for a nuclear reactor detector assembly of claim 4, wherein, The guide assembly further comprises a weighing sensor arranged on the bracket, and the weighing sensor is used for acquiring a force value of the pulling strip in real time.

6. The shielding arrangement for a nuclear reactor detector assembly of any one of claims 1-5, wherein, The driving assembly comprises a winch, and the pulling strip comprises a rope, and the winch is used for winding or releasing the rope.

7. The nuclear reactor probe assembly shielding device of any of claims 1-5, wherein, The pulling assembly comprises a counterweight block, and the counterweight block is adapted to be embedded in the tube cavity; an end of the counterweight block away from the pulling strip is provided with a connecting piece, and the connecting piece is used for detachably connecting the high-level detector.

8. The shielding arrangement for a nuclear reactor detector assembly of claim 7, wherein, The connecting piece comprises a lifting ring, one end of the lifting ring is fixedly connected with the counterweight block, and the other end is used for connecting a counterpart connected with the high-level detector.

9. A nuclear reactor detector assembly retrieval system characterized by, The shielding device comprises the nuclear reactor detector assembly according to any one of claims 1-8; and a ring lifting device detachably connected with the shielding device; a control device used for being communicatively connected with the ring lifting device and the driving assembly respectively to control the ring lifting device to drive the shielding device to move and control the driving assembly to drive the pulling assembly to accommodate the high-level detector into the tube cavity or release the high-level detector from the tube cavity through the pulling strip.

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