Burnup measurement and positioning device for use in pebble-bed high-temperature reactors.

Abstract

To solve such a problem that fuel balls are blocked when a fuel element runs in a dust and chipping environment is not fully considered.SOLUTION: A pressure-bearing unit comprises a pressure-bearing box body and an end flange, an allocation space is formed in the pressure-bearing box body, and the end flange is connected to the opening side of the pressure-bearing box body; a rotor unit comprises a rotating shaft, a material taking disc and a material distributing disc, and the material taking disc and the material distributing disc are connected to the rotating shaft in a sleeving mode and installed in the allocation space; a bush unit comprises a first bush and a second bush, and the first bush and the second bush are connected to the material taking disc and the material distributing disc in a sleeving mode. A non-return unit is sleeved on the rotating shaft and is connected with the end flange; the bearing assembly comprises a first bearing and a second bearing, and the first bearing and the second bearing are arranged in the end flange and the pressure bearing box body; a driving unit comprises a servo motor, a speed reducer, a coupler and a magnetic synchronizer which are connected in sequence.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to the technical field of nuclear reactor construction, and more particularly to a burnup measurement and positioning device applied to a pebble bed type high temperature reactor. [Background technology]

[0002] The inherent characteristics of HTGRs, such as high safety, high-quality process heat source and high-parameter steam, compact and modular design and construction, high power generation efficiency, and environmental friendliness, are fundamental advantages of HTGRs over other reactor types, and they are one of the advanced reactor types with the internationally recognized characteristics of fourth-generation nuclear power generation.As the online refueling system of HTGRs, the fuel loading / unloading system is a key system for ensuring the long-term safe and stable operation of HTGRs, so the continuous operating capability of the fuel loading / unloading system directly determines the safe operation level of the HTGR. Summary of the Invention [Problem to be solved by the invention]

[0003] During normal operation, the fuel loading and unloading system must perform the functions of burnup measurement and positioning of spherical fuel elements, directional distribution, and gas isolation. Currently, mainstream pebble bed high-temperature reactors at home and abroad all use multiple devices to perform these functions, and require sufficient installation and maintenance space for the system configuration. This results in redundant fuel transport routes, and the devices designed for these reactor types do not fully consider the problem of fuel ball clogging when the fuel elements operate in a helium gas, dust, and debris environment, posing major challenges to system operation and equipment maintenance in a highly radioactive environment. Therefore, the development of an integrated design for key devices in the fuel loading and unloading system is necessary to further simplify the system, which is not only beneficial to reducing the investment cost of high-temperature reactors, but also to improving the long-term safe and stable operation of the reactor. [Means for solving the problem]

[0004] The present invention has been proposed in view of the problems of fuel ball clogging that have been encountered in the fuel loading and unloading systems of the conventional pebble bed high temperature reactors described above, including the low level of equipment integration, the redundant fuel transport paths, and the fuel elements operating in an environment of helium gas, dust, and debris.

[0005] Therefore, the present invention aims to provide a burnup measurement and positioning device applicable to pebble bed type high temperature reactors, which overcomes a series of problems in the prior art, such as the large number of devices in the fuel loading and unloading system, the complicated layout, and the low efficiency of fuel transportation, and provides a burnup measurement and positioning device that can achieve high integration and high reliability of the functions of material separation and single transportation, burnup measurement and positioning, fuel directional distribution, and gas shut-off.

[0006] In order to solve the above-mentioned technical problems, the present invention provides the following solution: A burnup measurement positioning device applicable to a pebble bed type high temperature reactor, comprising: a pressure-receiving unit, a rotor unit, a bushing unit, a check unit, a bearing assembly, and a drive unit, the pressure-receiving unit comprising a pressure-receiving box and an end flange, the pressure-receiving box is open on one side and has an arrangement space therein, the end flange is connected to the open side of the pressure-receiving box, the rotor unit comprises a rotating shaft, a removal plate and a distribution plate, the removal plate and the distribution plate are both fitted onto the rotating shaft and can be both arranged in the arrangement space, the bushing unit comprises a first bushing and a second bushing. the first bushing and the second bushing are fitted onto the take-out plate and the distribution plate, respectively; the check unit is fitted onto the rotating shaft and connected to the end flange; the bearing assembly includes a first bearing and a second bearing, the first bearing is provided in the end flange, and the second bearing is provided in the pressure-receiving box and connected to the take-out plate; the drive unit includes a servo motor, a reducer, a coupling, and a magnetic synchronizer, both ends of the magnetic synchronizer are connected to the coupling and the end flange, respectively, and its output shaft is connected to the rotating shaft; and both ends of the reducer are connected to the output shaft of the servo motor and the coupling.

[0007] In a preferred solution described in the burnup measurement positioning device applicable to the pebble bed type high temperature reactor of the present invention, the arrangement space includes a static space and a distribution space, the static space and the distribution space are opened coaxially, and the static space is located at the opening of the pressure-receiving box body, the second bearing is installed in the static space, a first ball inlet hole, a first purge hole and a collimating hole are opened respectively in the three side walls adjacent to the opening end of the pressure-receiving box body, the first ball inlet hole and the collimating hole are positioned opposite each other, and a first ball outlet hole is opened symmetrically at the closed end of the pressure-receiving box body.

[0008] As a preferred solution described in the burnup measurement positioning device applied to the pebble bed type high temperature reactor of the present invention, the removal plate is fixed to and fitted on the rotating shaft and has a ball receiving groove opened at an angle in its side wall, and the distribution plate is fixedly attached to the rotating shaft and has an eccentric removal hole opened in the distribution plate, the position of which corresponds to the ball receiving groove.

[0009] A preferred solution described in the burnup measurement positioning device applicable to the pebble bed type high temperature reactor of the present invention is that a transport space is opened in the first bush, and a dust collection cavity is further opened in the first bush, and an inclined wall separates and connects the transport space and the dust collection cavity, and the transport space communicates with the dust collection cavity.

[0010] As a preferred solution described in the burnup measurement positioning device applicable to the pebble bed type high temperature reactor of the present invention, a second ball inlet hole is opened in the side wall of the first bush, the second ball inlet hole is connected to the transport space, the position of the second ball inlet hole corresponds to the position of the first ball inlet hole, and the removal plate can be fitted and positioned within the transport space.

[0011] As a preferred solution described in the burnup measurement positioning device applied to the pebble bed type high temperature reactor of the present invention, a second purge hole is further opened in the side wall of the dust collection cavity, the second purge hole corresponds to the position of the first purge hole, a first rotation hole is opened in the center of the closed end of the first bush, the rotation shaft can rotate and pass through the first rotation hole, and a second ball exit hole is further opened in the inner wall of the first bush on one side of the first rotation hole.

[0012] In a preferred solution described in the burnup measurement positioning device applied to the pebble bed type high temperature reactor according to the present invention, the second bushing has an open end, and the open end is fixedly connected to the end of the first bushing. Third ball exit holes are symmetrically opened at the closed end of the second bushing. A detection hole is opened in the side wall of the second bushing, and the detection hole corresponds to the position of the collimation hole.

[0013] As a preferred solution described in the burnup measurement positioning device applied to the pebble bed type high temperature reactor of the present invention, the second bearing includes a fixed base and a bearing fitting member, the bearing fitting member is rotatably fitted into the fixed base, the rotating shaft is fixedly inserted into the bearing fitting member, the fixed base is fixedly connected to the inner wall of the stationary space, and the structure of the first bearing is the same as the structure of the second bearing.

[0014] As a preferred solution described in the burnup measurement positioning device applicable to the pebble bed type high temperature reactor of the present invention, the end flange includes a first end and a second end, the first end is fixedly connected to one side of the second end, a stabilizing hole and a third rotation hole are coaxially opened in the first end and the second end, respectively, the stabilizing hole includes a rotation shaft hole and a check hole, and the first bearing and the check hole are fitted into and fixedly connected to the rotation shaft hole and the check hole, respectively.

[0015] In a preferred solution described in the burnup measurement positioning device applied to the pebble bed type high-temperature reactor according to the present invention, the non-return unit includes a pole base, a pole, a pole fixing pin, and a ratchet, the ratchet is fixedly fitted onto the rotating shaft and has an arc-shaped locking member fixedly connected to its outer wall, the pole base is fixedly connected coaxially to the non-return hole, a rebound groove is opened on the inner wall of the pole base, both ends of the pole fixing pin are rotatably connected to the rebound groove, and its axis is parallel to the axis of the pole base, the pole is fixedly connected to the outer wall of the pole fixing pin and can be fitted into the rebound groove, a torsion spring is further fixedly fitted onto the pole fixing pin, and the other end of the torsion spring is fixedly connected to the inner wall of the pole base. [Effects of the Invention]

[0016] The beneficial effects of the present invention are as follows: The present invention uses the pressure box and end flanges to fit together, sealing the take-out plate and distribution plate within the pressure box, ensuring that the fuel balls are not affected by external interference during transportation and forming a stable reaction area. The drive unit drives the rotation shaft to rotate, ensuring the transportation accuracy of the fuel balls and improving the reaction efficiency.

[0017] The first bushing encases the removal disc for transportation, and at the same time cleans the graphite dust and debris accumulated in the dust collection cavity to prevent clogging. The third ball exit hole symmetrically opened in the second bushing can improve the transportation efficiency of the fuel balls. [Brief explanation of the drawings]

[0018] In order to more clearly explain the solutions of the embodiments of the present invention, the following will briefly describe the drawings necessary for describing the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention, and those skilled in the art can obtain other drawings based on these drawings without any creative efforts. [Figure 1] 1 is a schematic diagram of the overall configuration of a burnup measurement and positioning device applied to a pebble bed type high temperature reactor according to the present invention. [Figure 2] 1 is a schematic diagram showing the configuration of a pressure box of a burnup measurement positioning device applied to a pebble bed type high temperature reactor according to the present invention. [Figure 3] 1 is a schematic diagram illustrating the configuration of a rotor unit of a burnup measurement positioning device applied to a pebble bed high-temperature reactor according to the present invention. [Figure 4] 1 is a schematic diagram showing the configuration of a first bush of a burnup measurement positioning device applied to a pebble bed high-temperature reactor according to the present invention. [Figure 5] 1 is a schematic diagram showing the configuration of a second bush of a burnup measurement positioning device applied to a pebble bed type high temperature reactor according to the present invention. [Figure 6] 10 is a schematic diagram showing another configuration of a distribution board of a burnup measurement and positioning device applied to a pebble bed type high temperature reactor according to the present invention. FIG. [Figure 7] 10 is a schematic diagram showing another configuration of the first bush and the second bush of the burnup measurement positioning device applied to the pebble bed type high temperature reactor according to the present invention. FIG. [Figure 8] 1 is a schematic diagram showing the configuration of an end flange of a burnup measurement positioning device applied to a pebble bed type high temperature reactor according to the present invention. FIG. [Figure 9] 1 is a schematic diagram illustrating the configuration of a check unit of a burnup measurement positioning device applied to a pebble bed type high temperature reactor according to the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0019] In order to make the above objects, features and advantages of the present invention more comprehensible, specific embodiments of the present invention will be described in detail below with reference to the drawings in the specification.

[0020] In the following description, numerous specific details are set forth to provide a thorough understanding of the present invention; however, the present invention may be embodied in other forms different from those described herein, and those skilled in the art may make similar extensions without departing from the scope of the present invention, and therefore the present invention is not limited to the specific embodiments disclosed below.

[0021] Next, the term "one embodiment" or "embodiment" as referred to herein refers to a particular feature, structure, or characteristic that may be included in at least one embodiment of the present invention. The appearances of "in one embodiment" in different places in this specification do not all refer to the same embodiment, nor are they mutually exclusive of other embodiments, either singly or in the alternative.

[0022] The present invention will now be described in detail with reference to schematic drawings, and when describing the embodiments of the present invention in detail, for ease of explanation, cross-sectional views showing device structures are not drawn to scale, and the schematic drawings are merely illustrative, which does not limit the scope of protection of the present invention, and should include three-dimensional spatial dimensions of length, width, and depth in actual manufacturing.

[0023] Example 1 Referring to Figure 1, this is a first embodiment of the present invention, which provides a burnup measurement positioning device applicable to a pebble bed type high temperature reactor, the device includes a pressure receiving unit 100, the pressure receiving unit 100 includes a pressure receiving box 101 and an end flange 102, the pressure receiving box 101 is open on one side and has an arrangement space A opened inside, and the end flange 102 is connected to the open side of the pressure receiving box 101.

[0024] In addition, the pressure-receiving box body 101 is the maximum pressure-receiving boundary of this device and is mainly used to attach the bush unit 300 and the rotor unit 200. The arrangement space A has a cylindrical countersink structure, and an M8 bottle hole is provided inside the pressure-receiving box body 101, which is used to tighten the angular bearing assembly of the second bearing 502. Twenty-four M24 bottle holes are provided on the top of the box, which are used to connect to the end flange 102.

[0025] The end flange 102 is attached to the top of the pressure-receiving box body 101 and is one of the pressure-receiving boundaries of the device. A through hole with an inner diameter of 110 mm is drilled in the center of the end flange, and multiple countersunk holes are drilled on both ends. The check unit 400 and the first bearing 501 are attached inside the end flange 102, and the end flange 102 is connected to the pressure-receiving box body 101 by stud bolts of the same length. A bolt hole is drilled in the top of the end flange 102 and is used to connect to the housing of the magnetic force synchronization device 604.

[0026] The rotor unit 200 includes a rotating shaft 201, a take-out plate 202, and a distribution plate 203, both of which are fitted onto the rotating shaft 201, and both of which can be arranged in the arrangement space A.

[0027] The rotor unit 200 is an execution component, and its functions are to transport the spherical elements as a single unit, measure burnup and position the fuel, and distribute the fuel in a directional manner. The rotating shaft 201 and the removal plate 202 are manufactured by integrally processing the forged parts. The removal plate 202 is located in the lower middle part of the rotating shaft 201. The interior of the removal plate has been treated to reduce its weight. The rotating shaft 201 is made of TC4 titanium alloy, and the removal plate 202 has been locally nitrided.

[0028] The distribution plate 203 is located below the take-out plate 202 and is connected to the rotating shaft 201 via a key. It is fixed by a hexagonal bottle with a blocking cover at the end and a hole in the head. The hexagonal bottle is locked with a wire rope. The distribution plate 203 is made of TC4 titanium alloy and has been locally nitrided.

[0029] The rotor unit 200 is constrained in the axial and radial directions of the shaft system by a pair of back-to-back angular contact ball bearings and a pair of deep groove ball bearings.

[0030] The bush unit 300 includes a first bush 301 and a second bush 302, which are fitted onto the outside of the removal plate 202 and the distribution plate 203, respectively, and the first bush 301 and the second bush 302 are coaxially mounted inside the pressure-receiving box body 101.

[0031] The check unit 400 is fitted onto the rotating shaft 201 and connected to the end flange 102. The check unit 400 realizes the functions of operation in one direction and check in the reverse direction, i.e., allows the rotating shaft 201 to operate along one direction and transport the fuel elements, and when the rotating shaft 201 rotates in the reverse direction, it can cooperate with the check unit 400 to realize the positioning function of the rotor unit 200.

[0032] The bearing assembly 500 includes a first bearing 501 and a second bearing 502, the first bearing 501 being provided in the end flange 102, and the second bearing 502 being provided in the pressure box 101 and connected to the removal platen 202.

[0033] The drive unit 600 includes a servo motor 601, a reducer 602, a coupling 603, and a magnetic synchronizer 604. Both ends of the magnetic synchronizer 604 are connected to the coupling 603 and the end flange 102, respectively, and its output shaft is connected to the rotating shaft 201. Both ends of the reducer 602 are connected to the output shaft of the servo motor 601 and the coupling 603.

[0034] In addition, the drive unit 600 is sealed and connected to the end flange 102, which is connected to the pressure-receiving box body 101, and the drive unit 600 is connected to the rotating shaft 201 of the rotor unit 200 by a form such as a straight key or a spline, so that the drive unit 600 can drive the rotor unit 200 to rotate.

[0035] Example 2 Referring to Figures 1 to 9, these are the second embodiment of the present invention, and this embodiment differs from the first embodiment in that the arrangement space A includes a static space A1 and a distribution space A2, the static space A1 and the distribution space A2 are opened coaxially, the static space A1 is located at the opening of the pressure-receiving box body 101, and the second bearing 502 is arranged in the static space A1.

[0036] A first ball entrance hole 101a, a first purge hole 101b, and a collimator hole 101c are opened in each of the three side walls adjacent to the open end of the pressure-receiving box body 101, and the first ball entrance hole 101a and the collimator hole 101c are positioned opposite each other, and a first ball exit hole 101d is opened symmetrically at the closed end of the pressure-receiving box body 101.

[0037] Furthermore, arrangement space A has a cylindrical counterbore structure, and a ball inlet pipe is connected to first ball inlet hole 101a opened on the side of pressure-receiving box body 101, with its axis forming an included angle of 15° with the horizontal plane. Ball outlet pipes are further connected to two first ball outlet holes 101d opened on the bottom of pressure-receiving box body 101, with the axes of the two first ball outlet holes 101d being parallel to the axis of arrangement space A.

[0038] Furthermore, the inner diameters of the first ball entrance hole 101a and the first ball exit hole 101d are preferably 65 mm, and the plane on which the first purge hole 101b, which is opened on the side of the pressure box 101, is located forms an included angle of 90° with the plane on which the first ball entrance hole 101a is located. The first purge hole 101b is used to periodically purge and remove graphite dust and debris accumulated in the dust collection cavity of the bushing, and the collimating hole 101c is used to meet the needs of burnup measurement positioning. During use, an external measuring device irradiates the fuel ball passing through the collimating hole 101c through the collimating hole 101c to complete the measurement.

[0039] The take-out plate 202 is fixedly fitted onto the rotating shaft 201 and has a ball receiving groove 202a opened at an angle in its side wall, and the distribution plate 203 is fixedly attached to the rotating shaft 201 and has a take-out hole 203a opened eccentrically in the distribution plate 203, the position of which corresponds to the ball receiving groove 202a.

[0040] The distributor 203 is located at the bottom of the take-out plate and is connected to the rotating shaft via a key. It is fixed by a hexagonal bottle with a blocking cover and a hole in the head, and the hexagonal bottle is locked with a wire rope. The distributor has a take-out hole 203a with a diameter of 65 mm. The distributor is made of TC4 titanium alloy and is locally nitrided.

[0041] Referring to Figures 3 to 7, a transport space B is opened within the first bushing 301, and a dust collection cavity 301a is further opened within the first bushing 301, and an inclined wall 301b separates and connects the transport space B and the dust collection cavity 301a, and the transport space B communicates with the dust collection cavity 301a.

[0042] A second ball entrance hole 301c is opened in the side wall of the first bushing 301, and the second ball entrance hole 301c is connected to the transport space B, and its position corresponds to the first ball entrance hole 101a, so that the take-out plate 202 can be fitted and positioned within the transport space B.

[0043] A second purge hole 301a-1 is further opened in the side wall of the dust collecting cavity 301a, and the second purge hole 301a-1 corresponds to the position of the first purge hole 101b. A first rotation hole 301d is opened in the center of the closed end of the first bushing 301, and the rotation shaft 201 can rotate and pass through the first rotation hole 301d. A second ball exit hole 301e is further opened in the inner wall of the first bushing 301 on one side of the first rotation hole 301d. The second ball exit hole 301e may be opened perpendicular to the groove bottom of the transport space B or may be opened in the inner wall of the transport space B, and finally communicates with the second bushing 302.

[0044] The second bushing 302 has an open end, which is fixedly connected to an end of the first bushing 301. Third ball exit holes 302a are symmetrically opened at the closed end of the second bushing 302. The inner diameter of the two third ball exit holes 302a is 65 mm, and the ball exit openings are coaxial with the ball exit holes of the box body. A detection hole 302b is opened in the side wall of the second bushing 302, and the detection hole 302b corresponds to the position of the collimation hole 101c.

[0045] The second bearing 502 includes a fixed base 502a and a bearing fitting member 502b, the bearing fitting member 502b is rotatably fitted into the fixed base 502a, the rotating shaft 201 is fixedly inserted into the bearing fitting member 502b, and the fixed base 502a is fixedly connected to the inner wall of the stationary space A1, and the structure of the first bearing 501 is the same as the structure of the second bearing 502.

[0046] In addition, a gate-shaped ball receiving groove 202a is formed on the circumferential surface of the take-out plate 202, and each ball receiving groove 202a can accommodate only one fuel ball. The bottom of the ball receiving groove 202a has an all-pass structure, and when the take-out plate 202 is positioned at the ball receiving position, the fuel ball enters the ball receiving groove 202a and is supported by the inclined surface at the bottom of the first bushing 301. The graphite dust and fragments that enter the ball receiving groove 202a along with the fuel ball fall into the dust collecting cavity 301a of the bushing due to gravity, thereby reducing the weight inside the take-out plate 202.

[0047] The second ball entrance hole 301c opened in the side of the first bushing 301 is coaxial with the first ball entrance hole 101a of the pressure-receiving box body 101 and has an inner diameter of 65 mm. The dust collection cavity 301a opened in the bottom has a meniscus-shaped countersink structure and is used to collect graphite dust and fragments that enter through the ball receiving groove 202a. The second purge hole 301a-1 opened in the side of the first bushing 301 is semicircular, coaxial with the first purge hole 101b, and communicates with the dust collection cavity 301a. The first bushing 301 is tightened and its position is limited by the fixing base 502a of the second bearing 502. A bottle hole is opened in the bottom of the first bushing 301 and is connected to the second bushing 302 by a tightening member.

[0048] The other structures are the same as those in the first embodiment.

[0049] Example 3 1 to 9, this is a third embodiment of the present invention, and this embodiment differs from the second embodiment in that the end flange 102 includes a first end 102a and a second end 102b, the first end 102a is fixedly connected to one side of the second end 102b, a stabilizing hole 102a-1 and a third rotating hole 102b-1 are coaxially opened in the first end 102a and the second end 102b, respectively, the stabilizing hole 102a-1 includes a rotating shaft hole 102a-1a and a check hole 102a-1b, and the first bearing 501 and the check unit 400 are fitted into and fixedly connected to the rotating shaft hole 102a-1a and the check hole 102a-1b, respectively.

[0050] The check unit 400 includes a pole base 401, a pole 402, a pole fixing pin 403, and a ratchet 404. The ratchet 404 is fixedly fitted onto the rotating shaft 201, and an arc-shaped locking member 404a is fixedly connected to its outer wall. The pole base 401 is fixedly connected coaxially to the check hole 102a-1b. A rebound groove 401a is formed on the inner wall of the pole base 401. Both ends of the pole fixing pin 403 are rotatably connected to the rebound groove 401a, and its axis is parallel to the axis of the pole base 401. The pole 402 is fixedly connected to the outer wall of the pole fixing pin 403 and can be fitted into the rebound groove 401a. A torsion spring 403a is fixedly fitted onto the pole fixing pin 403, and the other end of the torsion spring 403a is fixedly connected to the inner wall of the pole base 401.

[0051] The pole base 401 has a hollow cylindrical structure, and the pole fixing pin 403 is attached from the bottom up and is crimped by the pole base 401 and the end flange 102 .

[0052] The other structures are the same as those in the second embodiment.

[0053] It should be noted that the above embodiments are intended to illustrate but not limit the technical solutions of the present invention. Although the present invention has been described in detail with reference to preferred embodiments, it is understood by those skilled in the art that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them are included in the scope of the claims of the present invention.

Claims

1. A burnup measurement and positioning device applied to a pebble bed type high temperature reactor, The apparatus includes a pressure-receiving unit (100), a rotor unit (200), a bushing unit (300), a check unit (400), a bearing assembly (500), and a drive unit (600), The pressure-receiving unit (100) includes a pressure-receiving box (101) and an end flange (102), the pressure-receiving box (101) is open on one side and has an arrangement space (A) therein, and the end flange (102) is connected to the open side of the pressure-receiving box (101); The rotor unit (200) includes a rotating shaft (201), a take-out plate (202) and a distribution plate (203), the take-out plate (202) and the distribution plate (203) are both fitted onto the rotating shaft (201), and the take-out plate (202) and the distribution plate (203) can be both arranged in an arrangement space (A); The bush unit (300) includes a first bush (301) and a second bush (302), and the first bush (301) and the second bush (302) are fitted onto the take-out plate (202) and the distribution plate (203), respectively; The check unit (400) is fitted onto the rotating shaft (201) and connected to the end flange (102); The bearing assembly (500) includes a first bearing (501) and a second bearing (502), the first bearing (501) being provided in the end flange (102), and the second bearing (502) being provided in the pressure box (101) and connected to the take-out platen (202); The drive unit (600) includes a servo motor (601), a reducer (602), a coupling (603), and a magnetic synchronizer (604), both ends of the magnetic synchronizer (604) are connected to the coupling (603) and the end flange (102), respectively, and its output shaft is connected to the rotating shaft (201), and both ends of the reducer (602) are connected to the output shaft of the servo motor (601) and the coupling (603), When the take-out plate (202) is located at a fuel ball receiving position, the fuel ball enters through the first ball entrance hole (101 a) of the pressure-receiving box body (101), passes through the second ball entrance hole (301 c) of the first bush (301), and is stored in the ball receiving groove (202 a) of the take-out plate (202), 1. A burnup measurement positioning device applicable to a pebble bed type high temperature reactor, wherein the first ball entrance hole (101a) and the second ball entrance hole (301c) are coaxial.

2. The arrangement space (A) includes a static space (A1) and a distribution space (A2), the static space (A1) and the distribution space (A2) are coaxially opened, and the static space (A1) is located at the opening of the pressure-receiving box body (101), and the second bearing (502) is installed in the static space (A1); The first ball entrance hole (101a), the first purge hole (101b), and the collimator hole (101c) are opened in the three side walls of the pressure-receiving box body (101) adjacent to the open end thereof, and the first ball entrance hole (101a) and the collimator hole (101c) are positioned opposite each other, 2. The burnup measurement positioning device for use in a pebble bed type high temperature reactor according to claim 1, wherein first ball exit holes (101d) are symmetrically opened at the closed end of the pressure box (101).

3. The take-out plate (202) is fixedly fitted onto the rotating shaft (201), and the ball receiving groove (202a) is opened at an angle on the side wall of the take-out plate (202).

3. The burnup measurement positioning device for use in a pebble bed high-temperature reactor according to claim 2, wherein the distribution plate (203) is fixedly attached to a rotating shaft (201), an extraction hole (203a) is eccentrically opened in the distribution plate (203), and the position of the extraction hole (203a) corresponds to the ball receiving groove (202a).

4. 4. The burnup measurement positioning device for use in a pebble bed type high-temperature reactor according to claim 3, wherein a transport space (B) is opened in the first bush (301), and a dust collection cavity (301a) is further opened in the first bush (301), and a sloping wall (301b) separates and connects the transport space (B) and the dust collection cavity (301a), and the transport space (B) communicates with the dust collection cavity (301a).

5. 5. The burnup measurement positioning device for use in a pebble bed high-temperature reactor according to claim 4, wherein the second ball entrance hole (301c) is opened in a side wall of the first bush (301), the second ball entrance hole (301c) is connected to a transport space (B), the position of the second ball entrance hole (301c) corresponds to the position of the first ball entrance hole (101a), and the removal plate (202) can be fitted and positioned within the transport space (B).

6. 6. The burnup measurement positioning device according to claim 5, wherein a second purge hole (301a-1) is further formed in a side wall of the dust collection cavity (301a), the second purge hole (301a-1) corresponding to the position of the first purge hole (101b), a first rotation hole (301d) is formed in a center of the closed end of the first bush (301), the rotation shaft (201) can rotate and pass through the first rotation hole (301d), and a second ball exit hole (301e) is further formed in an inner wall of the first bush (301) on one side of the first rotation hole (301d).

7. 7. The burnup measurement positioning device for a pebble bed high-temperature reactor according to claim 6, wherein the second bushing (302) has an open end, the open end being fixedly connected to an end of the first bushing (301), third ball exit holes (302a) are symmetrically opened at a closed end of the second bushing (302), and a detection hole (302b) is opened in a side wall of the second bushing (302), and the detection hole (302b) corresponds to the position of the collimation hole (101c).

8. The second bearing (502) includes a fixed base (502a) and a bearing fitting member (502b), the bearing fitting member (502b) is rotatably fitted in the fixed base (502a), the rotating shaft (201) is fixedly inserted into the bearing fitting member (502b), and the fixed base (502a) is fixedly connected to the inner wall of the stationary space (A1); The burnup measurement positioning device applied to a pebble bed type high temperature reactor according to claim 7, wherein the structure of the first bearing (501) is the same as the structure of the second bearing (502).

9. The end flange (102) includes a first end (102a) and a second end (102b), the first end (102a) is fixedly connected to one side of the second end (102b), and a stabilizing hole (102a-1) and a third rotation hole (102b-1) are coaxially formed in the first end (102a) and the second end (102b), respectively; 9. The burnup measurement positioning device applicable to a pebble bed type high-temperature reactor according to claim 8, wherein the stabilization hole (102a-1) includes a rotation shaft hole (102a-1a) and a check hole (102a-1b), and the first bearing (501) and the check unit (400) are fitted into and fixedly connected to the rotation shaft hole (102a-1a) and the check hole (102a-1b), respectively.

10. The check unit (400) includes a pole base (401), a pole (402), a pole fixing pin (403), and a ratchet (404). The ratchet (404) is fixedly fitted onto the rotating shaft (201), and an arc-shaped locking member (404a) is fixedly connected to its outer wall. The pole base (401) is fixedly connected coaxially within the check hole (102a-1b). A rebound groove (401a) is opened on the inner wall of the pole base (401). Both ends of the pole fixing pin (403) are rotatably connected to the rebound groove (401a), and its axis is parallel to the axis of the pole base (401).

10. The burnup measurement positioning device applicable to a pebble bed type high temperature reactor as claimed in claim 9, wherein the pole (402) is fixedly connected to the outer wall of the pole fixing pin (403) and can be fitted and positioned within the rebound groove (401 a), a torsion spring (403 a) is further fixedly fitted onto the pole fixing pin (403), and the other end of the torsion spring (403 a) is fixedly connected to the inner wall of the pole base (401).

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