Burnup measurement calibration positioner for pebble bed high temperature reactor

Abstract

The present invention relates to the technical field of reactor supporting equipment, and provides a fuel consumption measurement calibration positioner for a pebble bed high temperature reactor, comprising a box body, a flange, a calibration ball and a shielding sleeve, the side wall of the box body is formed with a countersink and an alignment hole, the central axis of the countersink is orthogonal to the central axis of the alignment hole, and a first shielding layer is formed between the bottom of the alignment hole and the countersink; the distance from the bottom of the countersink to the orthogonal point is equal to the radius of the calibration ball; the shielding sleeve is arranged in the alignment hole, and the shielding sleeve includes a second shielding layer, and the first shielding layer and the second shielding layer are used to simulate two shielding structures on the alignment path of the fuel consumption measurement positioning distributor. After the calibration ball is placed in the working chamber, the center position of the calibration ball corresponds to the position of the orthogonal point, and then the calibration ball is detected and calibrated using a high activity gamma spectrometer. The position of the calibration ball is accurate, and the calibration accuracy is high, which is helpful to accurately obtain the fuel consumption of the spherical element in the fuel consumption measurement positioning distributor, and is beneficial to improve the utilization rate of the spherical element.

Description

Technical Field

[0001] The invention relates to the technical field of reactor supporting equipment, and in particular to a burnup measurement calibration positioner for a pebble bed high temperature reactor. Background Art

[0002] The pebble bed high temperature gas-cooled reactor uses spherical fuel elements to pass through the core multiple times to achieve continuous operation without stopping the reactor. The operation of the fuel loading and unloading system will directly affect the reactivity changes of the reactor. The online burnup measurement device measures the burnup of the fuel elements unloaded from the core. Elements that do not reach the target burnup are sent back to the core, and spent fuel that has reached the target burnup depth is exported for storage.

[0003] A device for accurately positioning the spherical element is set at the fuel consumption measurement point of the fuel loading and unloading system, and matched with the collimator of the fuel consumption measurement device, so that the high-activity gamma spectrometer can be used to measure the fuel consumption online. The "a spherical element detection and positioning device" disclosed in the Chinese invention patent CN109785985B is a fuel consumption measurement positioning distributor that performs the positioning function. The device works in a high-temperature, high-pressure, dust-containing, and highly radioactive helium atmosphere connected to a circuit, and operates smoothly. The average number of times the spherical element is operated to cooperate with the gamma spectrometer for fuel consumption measurement reaches 3,000 times per day. After long-term operation, the moving parts and positioning positions of the equipment may deviate, and fuel consumption measurement calibration is required. Since the fuel consumption measurement positioning distributor has harsh operating conditions and cannot be used for fuel consumption measurement calibration, it is necessary to set up a fuel consumption measurement calibration positioner that can be easily operated on site to cooperate with the fuel consumption measurement system for calibration. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems existing in the related art. To this end, the present invention proposes a burnup measurement calibration positioner for a pebble bed high temperature reactor, which can avoid interference from the operating environment and is used to calibrate the burnup measurement system.

[0005] A burnup measurement calibration positioner for a pebble bed high temperature reactor according to an embodiment of the present invention includes:

[0006] A box body, wherein a countersink and an alignment hole are formed on the side wall of the box body, the central axis of the countersink is orthogonal to the central axis of the alignment hole, and a first shielding layer is formed between the bottom of the alignment hole and the countersink;

[0007] A flange is detachably connected to the side wall of the box body, the flange is used to close the opening of the countersunk hole, and a working chamber is formed between the flange and the countersunk hole;

[0008] A calibration ball is arranged in the working chamber, and the distance from the bottom of the counterbore to the orthogonal point is equal to the radius of the calibration ball;

[0009] A shielding sleeve is arranged in the collimation hole, and the shielding sleeve includes a second shielding layer parallel to the first shielding layer. The first shielding layer and the second shielding layer are used to simulate two shielding structures on the collimation path of the fuel consumption measurement positioning distributor.

[0010] According to one embodiment of the present invention, a seat hole is formed on a side of the shielding sleeve away from the counterbore, and the bottom of the seat hole forms the second shielding layer;

[0011] A flanging flange is formed on one end of the shielding sleeve away from the countersunk hole, and the flanging flange is connected to the box body;

[0012] A shielding plug is arranged in the seat hole.

[0013] According to one embodiment of the present invention, the shielding plug and the shielding sleeve, as well as the shielding sleeve and the collimating hole are both interference fitted;

[0014] The shielding sleeve is provided with a first group of vent holes connected to the alignment hole and the seat hole, and the shielding plug is provided with a second group of vent holes connected to the seat hole and the outside.

[0015] According to an embodiment of the present invention, a pressure plate is provided on a side of the shielding sleeve facing away from the countersunk hole, and the pressure plate is detachably connected to the box body, and the pressure plate is used to limit the position of the shielding plug.

[0016] According to one embodiment of the present invention, a positioning component is provided between the cavity wall of the working chamber and the calibration sphere, and the positioning component is used to make the center of the calibration sphere correspond to the orthogonal point.

[0017] According to one embodiment of the present invention, the calibration ball is provided with a positioning hole, the flange is provided with a center hole, and the positioning assembly includes a positioning rod connected to the positioning hole and the center hole.

[0018] According to one embodiment of the present invention, the central hole passes through the flange, and the central hole includes an upper hole and a lower hole that are interconnected, and a detachably connected hole plug is provided in the upper hole;

[0019] A guide hole is provided at one end of the positioning rod facing the hole plug, and the guide hole is used to connect the guide rod.

[0020] According to an embodiment of the present invention, a truncated cone structure is provided on the positioning rod toward the hole plug, and a cross-sectional area of ​​the truncated cone structure gradually decreases along the insertion direction of the positioning rod.

[0021] According to one embodiment of the present invention, the opening of the lower hole facing the calibration ball is formed with an annular chamfer.

[0022] According to one embodiment of the present invention, a handle is provided on a side of the shielding plug facing away from the counterbore.

[0023] The above one or more technical solutions in the present invention have at least one of the following technical effects:

[0024] According to an embodiment of the present invention, a fuel consumption measurement calibration positioner for a pebble bed high temperature reactor includes a box, a flange, a calibration ball and a shielding sleeve. The side wall of the box is formed with a countersink and an alignment hole. The central axis of the countersink is orthogonal to the central axis of the alignment hole, and a first shielding layer is formed between the bottom of the alignment hole and the countersink; the flange is detachably connected to the side wall of the box, and the flange is used to close the opening of the countersink, and a working chamber is formed between the flange and the countersink; the calibration ball is arranged in the working chamber, and the distance from the bottom of the countersink to the orthogonal point is equal to the radius of the calibration ball; the shielding sleeve is arranged in the collimating hole, and the shielding sleeve includes a second shielding layer parallel to the first shielding layer, and the first shielding layer and the second shielding layer are used to simulate two shielding structures on the collimation path of the fuel consumption measurement positioning distributor. After the calibration ball is placed in the working chamber, the center position of the calibration ball corresponds to the position of the orthogonal point, and then the calibration ball is detected and calibrated using a high-activity gamma spectrometer. Since the first shielding layer and the second shielding layer can simulate the two shielding structures on the collimation path of the burnup measurement positioning distributor, after calibration, the burnup of the spherical element in the burnup measurement positioning distributor can be accurately obtained, which is conducive to improving the utilization rate of the spherical element, and the spherical element that reaches the target burnup depth can be discharged in time to ensure the stable and efficient operation of the reactor. The burnup measurement calibration positioner can provide accurate positioning for offline calibration of the online burnup measurement system, and is easy to disassemble, safe and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or related technologies, the drawings required for use in the embodiments or related technical descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 A cross-sectional view of a burnup measurement calibration positioner for a pebble bed high temperature reactor provided by an embodiment of the present invention;

[0027] Figure 2 A three-dimensional cross-sectional schematic diagram of a burnup measurement calibration positioner for a pebble bed high temperature reactor provided by an embodiment of the present invention;

[0028] Figure 3 A three-dimensional cross-sectional schematic diagram of a box body of a burnup measurement calibration positioner for a pebble bed high temperature reactor provided by an embodiment of the present invention;

[0029] Figure 4A three-dimensional cross-sectional view of a flange of a burnup measurement calibration positioner for a pebble bed high temperature reactor provided by an embodiment of the present invention;

[0030] Figure 5 A three-dimensional cross-sectional view of a shielding sleeve of a burnup measurement calibration positioner for a pebble bed high temperature reactor provided by an embodiment of the present invention;

[0031] Figure 6 A three-dimensional cross-sectional view of a shielding plug of a burnup measurement calibration locator for a pebble bed high temperature reactor provided in an embodiment of the present invention.

[0032] Reference numerals:

[0033] 1. Box body; 2. Flange; 3. Countersunk hole; 4. Alignment hole; 5. Central axis of countersunk hole; 6. Central axis of alignment hole; 7. Orthogonal point; 8. Boss; 9. Center hole; 9a. Lower hole; 9b. Upper hole; 9c. Chamfer; 10. Hole plug; 11. Calibration ball; 12. Calibration source; 13. Positioning hole; 14. Positioning rod; 15. Cone structure; 16. Guide hole; 17. Guide rod; 18. First shielding layer; 19. Shielding plug; 20. Shielding sleeve; 21. Seat hole; 22. Second shielding layer; 23. Flanged flange; 24. Press plate; 25. First set of vent holes; 26. Second set of vent holes; 27. Handle. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solution and advantages of the invention clearer, the technical solution in the invention will be clearly described below in conjunction with the drawings in the invention. Obviously, the described embodiments are part of the embodiments of the invention, not all of the embodiments. Based on the embodiments in the invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the invention.

[0035] In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limitations on the embodiments of the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0036] In the description of the embodiments of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0037] In the embodiments of the present invention, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0038] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiment of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0039] According to the embodiment of the present invention, the burnup measurement calibration positioner for the pebble bed high temperature reactor is provided. Figures 1 to 6 , including a box body 1, a flange 2, a calibration ball 11 and a shielding sleeve 20.

[0040] like Figure 1 As shown, the side wall of the box body 1 is formed with a countersink 3 and a collimating hole 4, and both the countersink 3 and the collimating hole 4 are formed with openings at the side wall of the box body 1, and the central axis 5 of the countersink and the central axis 6 of the collimating hole are orthogonal to the orthogonal point 7. The collimating hole 4 is arranged corresponding to the side wall of the countersink 3, and a first shielding layer 18 is formed between the bottom of the collimating hole 4 and the hole wall of the countersink 3.

[0041] The flange 2 is connected to the box body 1 through fasteners. The flange 2 is used to close the opening of the countersunk hole 3. The area between the flange 2 and the countersunk hole 3 forms a working chamber, and the working chamber is used to place the calibration ball 11 and the like.

[0042] In order to improve the tightness of the connection between the flange 2 and the countersunk hole 3, a boss 8 is formed on the side of the flange 2 facing the countersunk hole 3. When the flange 2 is connected to the box body 1, the boss 8 is inserted into the opening of the countersunk hole 3, and the connection between the box body 1 and the flange 2 is more stable and has better sealing, so as to protect the operator from excessive γ-ray exposure.

[0043] The center of the calibration ball 11 is the calibration source 12, which is arranged in the working chamber, the diameter of the counterbore 3 is slightly larger than the diameter of the calibration ball 11, and the distance from the bottom of the counterbore 3 to the orthogonal point 7 is equal to the radius of the calibration ball 11. When the calibration ball 11 is placed in the counterbore 3, the center of the calibration source 12 is in the horizontal alignment plane of the central axis 6 of the alignment hole.

[0044] In some embodiments, the diameter of the counterbore 3 and the diameter of the calibration sphere 11 have a first difference, and the diameter of the counterbore 3 and the diameter of the alignment hole 4 have a second difference.

[0045] It can be understood that the structural features, positional relationship and numerical range of the counterbore 3, the alignment hole 4 and the calibration ball 11 are consistent with those of the online fuel consumption measurement positioning distributor.

[0046] In some embodiments, the diameter of the calibration sphere 11 is 60 mm, the diameter of the countersunk hole 3 is 62 mm to 63 mm, which is slightly larger than the diameter of the calibration sphere 11, the distance from the bottom of the countersunk hole 3 to the orthogonal point 7 is 30 mm, which is equal to the radius of the calibration sphere 11, and the diameter of the collimation hole 4 is 50 mm.

[0047] After the calibration ball 11 is placed in the working chamber, the center of the calibration source 12 is in the horizontal collimation plane of the central axis 6 of the collimation hole, and the position deviation relative to the orthogonal point 7 is 0.5mm to 1mm, which can simulate the actual working environment of the calibration ball 11 and accurately obtain the fuel consumption of the spherical element in the fuel consumption measurement and positioning distributor, which is beneficial to improve the utilization rate of the spherical element.

[0048] The shielding sleeve 20 is arranged in the collimation hole 4, and the shielding sleeve 20 includes a second shielding layer 22, and the second shielding layer 22 is arranged parallel to the first shielding layer 18. The first shielding layer 18 and the second shielding layer 22 are used to simulate two shielding structures on the collimation path of the fuel consumption measurement positioning distributor.

[0049] In the fuel consumption measurement and positioning distributor, please refer to Chinese invention patent CN109785985B. The spherical element is located in the ball passage, and there are two shields between the spherical element and the high-activity gamma spectrometer, namely, the thinning groove and the bottom thickness of the collimated countersunk hole. The thickness and position relationship of the first shielding layer 18 and the second shielding layer 22 are consistent with the two shielding structures, which are used to simulate the actual working environment of the spherical element, which is conducive to improving the detection accuracy of the online high-activity gamma spectrometer, and can accurately obtain the fuel consumption of the spherical element in the fuel consumption measurement and positioning distributor, which is conducive to improving the utilization rate of the spherical element, and can also timely discharge the spherical element that reaches the target fuel consumption depth to ensure stable and efficient operation of the reactor.

[0050] In some embodiments, there is a first shielding layer 18 between the countersunk hole 3 and the collimation hole 4 of the housing 1. The thickness of the first shielding layer 18 is minimum at the center axis 6 of the collimation hole, where the thickness is 3 mm, corresponding to the minimum thickness point outside the rotor through hole of the fuel consumption measurement positioning distributor. The thickness at this point has the greatest impact on the calibration accuracy.

[0051] In some embodiments, a seat hole 21 is formed on the side of the shielding sleeve 20 away from the countersunk hole 3, a second shielding layer 22 is formed on the bottom of the seat hole 21, and a flanged flange 23 is formed on the end of the shielding sleeve 20 away from the countersunk hole 3, and the flanged flange 23 is connected to the box body 1 through fasteners.

[0052] The thickness of the second blocking layer 22 corresponds to the bottom edge thickness of the collimating countersunk hole of the fuel consumption measurement positioning distributor. The second blocking layer 22 and the first blocking layer 18 simulate the two shields on the collimating path of the fuel consumption measurement positioning distributor, and the gap between the second blocking layer 22 and the first blocking layer 18 in the collimating hole 4 is also consistent with the gap between the two shields on the collimating path of the fuel consumption measurement positioning distributor, thereby ensuring the accuracy of calibration.

[0053] The burnup measurement calibration positioner for the pebble bed high temperature reactor provided by the present invention is installed at the site of the burnup measurement positioning distributor. Different from the strong radioactivity of the spherical element, the radioactivity of the calibration ball is very weak, but if it is not shielded, it will also irradiate the on-site maintenance personnel, so a shielding plug 19 is installed in the seat hole 21. When the burnup measurement calibration is required, the shielding plug 19 is taken out. At this time, on the collimation path, only the second shielding layer 22 and the first shielding layer 18 shield the radiation of the calibration source 12, ensuring the validity of the calibration data.

[0054] In some embodiments, a pressure plate 24 is provided on the side of the shielding sleeve 20 away from the counterbore 3 . The pressure plate 24 is detachably connected to the box body 1 to limit the position of the shielding plug 19 and prevent the shielding plug 19 from detaching from the shielding sleeve 20 .

[0055] It can be understood that the pressing plate 24 can be connected to the box body 1 through a fastener or a snap-fit ​​structure, and the number of the pressing plate 24 can be one or more.

[0056] In some embodiments, the shielding plug 19 and the shielding sleeve 20 as well as the shielding sleeve 20 and the collimating hole 4 are all fitted with interference fit to reduce the irradiation of personnel by the gamma rays of the calibration source 12 through the aperture effect.

[0057] At the same time, since there is air in the collimating hole 4 and the seat hole 21 during installation, the compressed air will hinder the installation of the shielding sleeve 20 and the shielding plug 19, so the first group of air holes 25 and the second group of air holes 26 are respectively provided on the shielding sleeve 20 and the shielding plug 19. The first group of air holes 25 are connected to the collimating hole 4 and the seat hole 21, and the second group of air holes 26 are connected to the seat hole 21 and the outside, so as to facilitate the escape of compressed air during the installation process and ensure smooth assembly.

[0058] Since the shielding plug 19 is heavy, a handle 27 is provided on the side of the shielding plug 19 away from the countersunk hole 3 to facilitate the disassembly and assembly of the shielding plug 19 .

[0059] According to the fuel consumption measurement calibration positioner for a pebble bed high temperature reactor provided by an embodiment of the present invention, the structural features, positional relationship and numerical range of the countersunk hole 3, the alignment hole 4 and the calibration ball 11 are consistent with those of an online fuel consumption measurement positioning distributor, and can simulate the actual working environment of the calibration ball 11, and can accurately obtain the fuel consumption of the spherical elements in the fuel consumption measurement positioning distributor, which is beneficial to improving the utilization rate of the spherical elements.

[0060] In some embodiments, a positioning component is provided between the cavity wall of the working chamber and the calibration sphere 11 , and the positioning component is used to make the center of the calibration sphere 11 correspond to the orthogonal point 7 .

[0061] It is understandable that when the center of the calibration sphere 11 corresponds to the orthogonal point 7, the calibration source 12 corresponds to the position of the orthogonal point 7, which is conducive to obtaining the rays of the calibration source 12. The positioning component can be arranged on the wall of the working chamber, and can also be arranged on the flange 2.

[0062] In some embodiments, a positioning hole 13 is provided on the calibration ball 11 , a center hole 9 is provided on the flange 2 , and the positioning assembly includes a positioning rod 14 connected to the positioning hole 13 and the center hole 9 .

[0063] It can be understood that one end of the positioning rod 14 is connected to the center hole 9 and the other end is connected to the positioning hole 13. The positioning rod 14 can prevent the calibration ball 11 from lateral movement, thereby making the center position of the calibration ball 11 correspond to the orthogonal point 7.

[0064] In some embodiments, the center hole 9 passes through the flange 2, and the center hole 9 includes an upper hole 9b and a lower hole 9a that are interconnected. The diameter of the upper hole 9b is larger than that of the lower hole 9a. A detachable hole plug 10 is provided in the upper hole 9b, and the lower hole 9a is used to connect the positioning rod 14. In addition to closing the center hole 9, the hole plug 10 also serves as a shield for the center hole 9 to protect the operator from excessive gamma ray exposure. A guide hole 16 is provided at one end of the positioning rod 14 facing the hole plug 10, and the guide hole 16 is used to connect the guide rod 17.

[0065] In some embodiments, a truncated cone structure 15 is provided on the positioning rod 14 facing the hole plug 10 , and the truncated cone structure 15 facilitates the positioning rod 14 to be inserted into the lower hole 9 a .

[0066] It can be understood that along the insertion direction of the positioning rod 14, the cross-sectional area of ​​the truncated cone structure 15 gradually decreases, so the end size of the positioning rod 14 is smaller, which is conducive to the insertion of the positioning rod 14 into the lower hole 9a.

[0067] In some embodiments, the opening of the lower hole 9a facing the calibration ball 11 is formed with an annular chamfer 9c, and the chamfer 9c is arranged in an annular shape to form a trumpet-shaped opening, which is conducive to inserting the positioning rod 14 into the central hole 9.

[0068] According to the burnup measurement calibration positioner for a pebble bed high temperature reactor provided by an embodiment of the present invention, the process of placing the calibration ball 11 in the countersunk hole 3 is as follows:

[0069] First, insert one end of the positioning rod 14 into the positioning hole 13 of the calibration ball 11;

[0070] Then, the guide rod 17 is inserted into the guide hole 16 of the positioning rod 14;

[0071] Next, place the calibration ball 11 into the countersunk hole 3;

[0072] Next, open the hole plug 10 of the flange 2, and put the center hole 9 of the flange 2 on the outside of the guide rod 17. When the flange 2 is close to the positioning rod 14, use the truncated cone structure 15 of the positioning rod 14 to guide the positioning rod 14 into the center hole 9 of the flange 2.

[0073] Again, the flange 2 is fastened to the box body 1 by fasteners;

[0074] Finally, the guide rod 17 is pulled out, the hole plug 10 is covered, and the placement of the calibration ball 11 is completed.

[0075] It can be understood that due to the cooperation between the positioning rod 14, the flange 2 and the center hole 9, the calibration ball 11 can be stably placed on the central axis of the countersunk hole of the box body 1, which can ensure that the calibration source 12 of the calibration ball 11 is located at the orthogonal point 7, thereby ensuring the precise positioning of the calibration ball 11.

[0076] In summary, the fuel consumption measurement calibration positioner for a pebble bed high temperature reactor provided according to an embodiment of the present invention includes a housing 1, a flange 2, a calibration ball 11 and a shielding sleeve 20. The side wall of the housing 1 is formed with a countersunk hole 3 and an alignment hole 4. The central axis 5 of the countersunk hole is orthogonal to the central axis 6 of the alignment hole, and a first shielding layer 18 is formed between the bottom of the alignment hole 4 and the countersunk hole 3; the flange 2 is detachably connected to the side wall of the housing 1, and the flange 2 is used to close the opening of the countersunk hole 3, and a working chamber is formed between the flange 2 and the countersunk hole 3; the calibration ball 11 is arranged in the working chamber, and the distance from the bottom of the countersunk hole 3 to the orthogonal point 7 is equal to the radius of the calibration ball 11; the shielding sleeve 20 is arranged in the alignment hole 4, and the shielding sleeve 20 includes a second shielding layer 22 parallel to the first shielding layer 18, and the first shielding layer 18 and the second shielding layer 22 are used to simulate two shielding structures on the alignment path of the fuel consumption measurement and positioning distributor. After the calibration ball 11 is placed in the working chamber, the center position of the calibration ball 11 corresponds to the position of the orthogonal point 7, and then the calibration ball 11 is detected and calibrated using a high-activity gamma spectrometer. Since the first shielding layer 18 and the second shielding layer 22 can simulate the two shielding structures on the collimation path of the fuel consumption measurement and positioning distributor, after calibration, the fuel consumption of the spherical element in the fuel consumption measurement and positioning distributor can be accurately obtained, which is conducive to improving the utilization rate of the spherical element, and the spherical element that reaches the target fuel consumption depth can be discharged in time to ensure stable and efficient operation of the reactor.

[0077] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A burnup measurement calibration positioner for a pebble bed high temperature reactor, characterized in that: include: A box body, wherein a countersink and an alignment hole are formed on the side wall of the box body, the central axis of the countersink is orthogonal to the central axis of the alignment hole, and a first shielding layer is formed between the bottom of the alignment hole and the countersink; A flange is detachably connected to the side wall of the box body, the flange is used to close the opening of the countersunk hole, and a working chamber is formed between the flange and the countersunk hole; A calibration ball is arranged in the working chamber, and the distance from the bottom of the counterbore to the orthogonal point is equal to the radius of the calibration ball; A shielding sleeve is disposed in the collimation hole, the shielding sleeve includes a second shielding layer parallel to the first shielding layer, the first shielding layer and the second shielding layer are used to simulate two shielding structures on the collimation path of the burnup measurement positioning distributor; A seat hole is formed on a side of the shielding sleeve away from the counterbore, and the bottom of the seat hole forms the second shielding layer; A flanging flange is formed on one end of the shielding sleeve away from the countersunk hole, and the flanging flange is connected to the box body; A shielding plug is arranged in the seat hole.

2. The burnup measurement calibration positioner for a pebble bed high temperature reactor according to claim 1, characterized in that: The shielding plug and the shielding sleeve, as well as the shielding sleeve and the alignment hole are all interference fitted; The shielding sleeve is provided with a first group of vent holes connected to the alignment hole and the seat hole, and the shielding plug is provided with a second group of vent holes connected to the seat hole and the outside.

3. The burnup measurement calibration positioner for a pebble bed high temperature reactor according to claim 1, characterized in that: A pressing plate is provided on one side of the shielding sleeve away from the countersunk hole. The pressing plate is detachably connected to the box body and is used to limit the position of the shielding plug.

4. The burnup measurement calibration positioner for a pebble bed high temperature reactor according to any one of claims 1 to 3, characterized in that: A positioning component is provided between the cavity wall of the working chamber and the calibration sphere, and the positioning component is used to make the center of the calibration sphere correspond to the orthogonal point.

5. The burnup measurement calibration positioner for a pebble bed high temperature reactor according to claim 4, characterized in that: The calibration ball is provided with a positioning hole, the flange is provided with a center hole, and the positioning assembly includes a positioning rod connected to the positioning hole and the center hole.

6. The burnup measurement calibration positioner for a pebble bed high temperature reactor according to claim 5, characterized in that: The central hole passes through the flange, and the central hole includes an upper hole and a lower hole that are interconnected, and a detachably connected hole plug is provided in the upper hole; A guide hole is provided at one end of the positioning rod facing the hole plug, and the guide hole is used to connect the guide rod.

7. The burnup measurement calibration positioner for a pebble bed high temperature reactor according to claim 6, characterized in that: The positioning rod is provided with a truncated cone structure toward the hole plug, and the cross-sectional area of ​​the truncated cone structure gradually decreases along the insertion direction of the positioning rod.

8. The burnup measurement calibration positioner for a pebble bed high temperature reactor according to claim 6, characterized in that: The opening of the lower hole toward the calibration ball is formed with an annular chamfer.

9. The burnup measurement calibration positioner for a pebble bed high temperature reactor according to any one of claims 1 to 3, characterized in that: A handle is provided on a side of the shielding plug away from the countersunk hole.

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