Assembly device and method of linear neutron source for neutron sensitivity calibration of out-of-pile detectors

Abstract

The present invention relates to the technical field of neutron sensitivity calibration for off-core detectors, and provides an assembly device and method for a linear neutron source for neutron sensitivity calibration of off-core detectors. The device comprises a shielding body having a transverse through hole, a first vertical hole being provided on the upper side of one end of the transverse through hole, a second vertical hole being provided on the lower side of the other end, and a third vertical hole being provided on the upper side corresponding to the second vertical hole; a multi-porous positioning member having accommodation holes spaced apart along its length, wherein after the multi-porous positioning member is placed in the transverse through hole, a neutron source can be placed into the accommodation hole from the first vertical hole; a linear neutron source housing for receiving the neutron source in the accommodation hole, comprising a shell and a shell cover, the shell cover being threadedly connected to the shell, and a clamping block for transmitting torque being provided on the top of the shell cover; a fixing component for fixing or loosening the linear neutron source housing; an operating handle capable of being placed in the third vertical hole, and a clamping slot at the bottom thereof being provided for cooperating with the clamping block. The present invention can improve assembly efficiency and reduce the radiation dose received by workers during the neutron source transportation process.

Description

Technical Field

[0001] The present invention relates to the technical field of neutron sensitivity calibration of an ex-pile detector, and in particular to an assembly device and method of a linear neutron source for neutron sensitivity calibration of an ex-pile detector. Background Art

[0002] In nuclear reactor design, external detectors are placed at various locations outside the core to monitor the core neutron fluence rate. This is a common method for online measurement of the core neutron fluence rate. The accuracy of external detector measurements can significantly impact the safe operation of the reactor, so the neutron sensitivity of the detectors must be calibrated.

[0003] When calibrating the neutron sensitivity of an ex-pile detector, a calibration device uses multiple neutron sources to form a linear neutron source to simulate the working environment of the ex-pile detector within the ex-pile detector channel. Due to the large number of neutron sources (approximately twenty), the presence of fillers in between to position the neutron sources, and the high neutron radiation dose of the assembled linear neutron source, there is currently no dedicated assembly device for linear neutron sources. This results in low assembly efficiency and high radiation doses for workers. Therefore, designing a dedicated assembly device to reduce the workload during the assembly process and lower the radiation dose to workers during neutron source transportation remains an urgent challenge in this field. Summary of the Invention

[0004] The object of the present invention is to provide an assembly device and method for a linear neutron source for neutron sensitivity calibration of an off-core detector, so as to reduce the workload of the assembly process and lower the dose received by workers during the transportation of the neutron source.

[0005] The present invention is achieved through the following technical solutions:

[0006] The linear neutron source assembly device for neutron sensitivity calibration of the ex-pile detector includes:

[0007] The shielding body is provided with a transverse through hole, a first vertical hole is provided on the upper side of one end of the transverse through hole and is connected to the first vertical hole, a second vertical hole is provided on the lower side of the other end of the transverse through hole and is connected to the second vertical hole, and a third vertical hole is provided on the upper side of the transverse through hole corresponding to the second vertical hole;

[0008] A porous positioning member is provided with a plurality of accommodating holes for accommodating neutron sources at intervals along its length. After the porous positioning member is placed in the transverse through hole, the neutron source can be placed into the accommodating holes through the first vertical hole;

[0009] The linear neutron source cladding, after being placed in the second vertical hole, can receive the neutron source in the accommodating hole; the linear neutron source cladding comprises a shell and a shell cover, the shell cover is connected to the shell by threads, and a clamping block for transmitting torque is provided on the top of the shell cover;

[0010] a fixing component connected to the shielding body and used for fixing or releasing the cladding of the linear neutron source;

[0011] The operating handle can be placed in the third vertical hole, and the bottom is provided with a card slot that can cooperate with the card block.

[0012] Optionally, the fixing component is a screw, and a transverse threaded hole communicating with the second vertical hole is provided on one side of the shielding body. The fixing component is connected to the transverse threaded hole and can press against the linear neutron source cladding placed in the second vertical hole.

[0013] Optionally, a drawstring is connected to the top of the shell cover, and a rope hole for passing the drawstring is provided in the center of the operating handle, so that the shell cover and the operating handle are relatively fixed.

[0014] Optionally, the cross section of the block perpendicular to the axis of the shell cover is a polygonal structure.

[0015] Optionally, the cross section of the block perpendicular to the axis of the shell cover is a rectangular structure.

[0016] Optionally, the cross-section of the porous positioning member perpendicular to the length direction is a polygonal structure.

[0017] Optionally, the cross-section of the porous positioning member perpendicular to the length direction is a rectangular structure.

[0018] Optionally, the accommodating hole is a tapered hole that is larger at the top and smaller at the bottom.

[0019] Optionally, the top ends of the first vertical hole, the second vertical hole and the third vertical hole are all provided with tapered guide portions.

[0020] The present invention also provides a method for assembling a linear neutron source for neutron sensitivity calibration of an ex-pile detector, using the assembly device described in the third item above, comprising the following steps:

[0021] S1. Insert the porous positioning member into the transverse through hole, and place the neutron sources sequentially into the first vertical hole while moving the porous positioning member so that the neutron sources sequentially fall into the respective receiving holes of the porous positioning member;

[0022] S2. After the neutron source is placed, the entire device is transported to the location of the neutron sensitivity calibration device for the ex-core detector. The second vertical hole is aligned with the hole of the neutron source on the placement line of the neutron sensitivity calibration device for the ex-core detector, and the entire device is fixed.

[0023] S3. Connect the shell cover to the housing, pass the drawstring connected to the top of the shell cover through the rope hole of the operating handle, and tighten the drawstring to make the card slot of the operating handle fit with the card block of the shell cover;

[0024] S4. Insert the fixed linear neutron source cladding and operating handle from the third vertical hole. After the linear neutron source cladding enters the second vertical hole, fix it with a fixing member. Rotate and lift the operating handle to separate the shell cover from the shell body, and then remove the shell cover.

[0025] S5. Move the porous positioning member to allow the neutron sources in the accommodating holes to fall into the shell in sequence, and place the filler through the third vertical hole so that it falls into the cladding of the linear neutron source. Then, use the operating handle to tighten the shell cover onto the shell.

[0026] S6. Loosen the pull rope passed through the rope hole of the operating handle to separate the operating handle from the linear neutron source cladding, release the fixing component from the linear neutron source cladding, and place the linear neutron source cladding into the channel of the neutron sensitivity calibration device of the off-core detector by controlling the pull rope. Remove the pull rope and move the assembly device away.

[0027] The technical solution of the present invention has at least the following advantages and beneficial effects: In the present invention, the porous positioning member is provided with a plurality of accommodating holes for accommodating neutron sources. After the neutron sources are placed in the transverse through holes of the shielding body, the neutron sources or fillers can be placed into the accommodating holes through the first vertical holes, so that the neutron sources and fillers are temporarily stored in the shielding body through the porous positioning member. The shielding body shields the neutron sources. During subsequent transportation, the neutron sources are all inside the shielding body, thereby reducing the radiation dose received by workers during the transportation of the neutron sources.

[0028] After the assembly device is transported to the laboratory where the neutron sensitivity calibration device for the extra-core detector is located, it is aligned with the channel of the extra-core detector neutron sensitivity calibration device where the linear neutron source is placed. Then, by moving the porous positioning parts, the linear neutron source and the filler can be dropped into the shell of the linear neutron source cladding. Then, the filler is loaded, and after tightening the shell cover, the linear neutron source cladding can be installed into the channel of the extra-core detector neutron sensitivity calibration device where the linear neutron source is placed. The entire assembly process is simple and quick, thereby improving assembly efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0030] Figure 1 A schematic structural diagram of a linear neutron source assembly device for neutron sensitivity calibration of an out-of-pile detector provided by the present invention;

[0031] Figure 2 Schematic diagram of the structure of the shielding body;

[0032] Figure 3 Schematic diagram of the structure of the porous positioning member;

[0033] Figure 4 It is a structural diagram of the operating handle;

[0034] Figure 5 Schematic diagram of the structure of the cladding of the linear neutron source;

[0035] Icon: 1-shielding body, 101-transverse through hole, 102-first vertical hole, 103-second vertical hole, 104-third vertical hole, 105-transverse threaded hole, 2-porous positioning piece, 201-accommodation hole, 3-line neutron source cladding, 301-shell cover, 3011-block, 302-shell, 4-fixing part, 5-operating handle, 501-slot, 502-rope hole, 6-pull rope. DETAILED DESCRIPTION

[0036] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0037] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort shall fall within the scope of protection of the present invention.

[0038] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0039] In the description of the present invention, it should be noted that if the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings, or is the orientation or position relationship in which the product of the application is usually placed when in use. It is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0040] It should also be noted that, in the description of the present invention, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention in specific contexts.

[0041] Example 1

[0042] refer to Figure 1 This embodiment provides a linear neutron source assembly device for neutron sensitivity calibration of an ex-core detector, including a shielding body 1, a porous positioning member 2, a linear neutron source cladding 3, a fixing component 4 and an operating handle 5.

[0043] The shielding body 1 is used to shield the neutron source and is made of a material that can shield radiation. The specific material is not limited. For example, in this embodiment, the shielding body 1 is made of polyethylene material to reduce its weight. Figure 2 The shielding body 1 is provided with a transverse through hole 101, and a first vertical hole 102 is provided on the upper side of one end of the transverse through hole 101 to be connected thereto. The first vertical hole 102 is used to place the neutron source into the channel, and a second vertical hole 103 is provided on the lower side of the other end of the transverse through hole 101 to be connected thereto. The second vertical hole 103 is used to place the linear neutron source cladding 3, and a third vertical hole 104 is provided on the upper side of the transverse through hole 101 corresponding to the second vertical hole. The third vertical hole 104 is used to place the operating handle 5.

[0044] As an option, in this embodiment, the top ends of the first vertical hole 102 , the second vertical hole 103 and the third vertical hole 104 are all provided with tapered guide portions to facilitate guiding the inserted components.

[0045] refer to Figure 3 The porous positioning member 2 is provided with a plurality of accommodating holes 201 for accommodating neutron sources at intervals along its length. The accommodating holes 201 are tapered holes that are larger at the top and smaller at the bottom, facilitating the neutron sources to fall into them. It is easy to understand that the number of accommodating holes 201 is equal to or greater than the total number of neutron sources to be installed, ensuring that all neutron sources can be temporarily stored in the porous positioning member 2. During use, the porous positioning member 2 is placed into the transverse through-hole 101, and the neutron source is placed through the first vertical hole 102. The porous positioning member 2 is then moved simultaneously, so that the neutron source can be placed into each accommodating hole 201 in sequence, while the porous positioning member 2 is shielded by the shielding body 1.

[0046] As an option, the cross-section of the porous positioning member 2 perpendicular to the length direction is a polygonal structure. It is easy to understand that the shape of the transverse through hole 101 on the shielding body 1 should match that of the porous positioning member 2, that is, the cross-section of the transverse through hole 101 perpendicular to the length direction is also polygonal. This configuration prevents the porous positioning member 2 from rotating arbitrarily after being placed in the transverse through hole 101, which would prevent the neutron source from falling from the first vertical hole 102 into the accommodating hole 201. Furthermore, the cross-section of the porous positioning member 2 perpendicular to the length direction is a rectangular structure. It is easy to understand that in other embodiments, the cross-section of the porous positioning member 2 perpendicular to the length direction can of course also be other polygonal structures, as long as the porous positioning member 2 is prevented from rotating.

[0047] After the linear neutron source cladding 3 is placed into the second vertical hole 103, it is fixed by the fixing member 4 for receiving the neutron source in the accommodating hole 201. The fixing member 4 is connected to the shielding body 1. As an option, in this embodiment, the fixing member 4 is a screw. A transverse threaded hole 105 is provided on one side of the shielding body 1 and communicates with the second vertical hole 103. The fixing member 4 is connected to the transverse threaded hole 105 and pressed against the linear neutron source cladding 3 placed in the second vertical hole 103 to fix the linear neutron source cladding 3 in the second vertical hole 103. The screw can be released by moving away from the linear neutron source cladding 3. It is easy to understand that in other embodiments, the fixing member 4 can also adopt other structures. For example, the fixing member 4 can be a pair of clamping blocks disposed at the bottom of the second vertical hole 103. The pair of clamping blocks can move closer to or further away from each other. When they move closer to each other, they clamp the linear neutron source cladding 3. When they move away from each other, they release the linear neutron source cladding 3.

[0048] refer to Figure 4 and Figure 5 The linear neutron source cladding 3 includes a shell 302 and a shell cover 301. The shell cover 301 is connected to the shell 302 by threads. A clamping block 301 for transmitting torque is provided on the top of the shell cover 301. The operating handle 5 can be placed in the third vertical hole 104. The bottom of the operating handle 5 is provided with a clamping groove 501 that can cooperate with the clamping block 3011. When in use, after the clamping groove 501 at the bottom of the operating handle 5 is matched with the clamping block 3011 on the top of the shell cover 301, the shell cover 301 can be tightened or loosened by twisting the operating handle 5.

[0049] As an option, the cross-section of the block 3011 perpendicular to the axis of the shell cover 301 is a polygonal structure. On this basis, the cross-section of the slot 501 perpendicular to the axis of the shell cover 301 is also a polygonal structure, so that the operating handle 5 and the shell cover 301 cannot rotate relative to each other, thereby achieving the purpose of transmitting torque. Further, the cross-section of the block 3011 perpendicular to the axis of the shell cover 301 is a rectangular structure. Of course, in other embodiments, the cross-section of the block 3011 perpendicular to the axis of the shell cover 301 can also be other polygonal structures, as long as it can limit the relative rotation of the operating handle 5 and the shell cover 301. In addition, in other embodiments, the block 3011 and the slot 501 can cooperate to achieve torque transmission. Of course, other structures can also be used to achieve this, for example, the block 3011 is provided with teeth on its periphery, and the slot 501 sidewalls are provided with teeth that engage with them.

[0050] In this embodiment, a drawstring 6 is connected to the top of the housing 301 in a detachable manner, such as by tying a knot. A rope hole 502 is provided in the center of the operating handle 5 for inserting the drawstring 6. The housing 301 and the operating handle 5 are fixed relative to each other by inserting the drawstring 6 through the rope hole 502 and tightening it. As an option, the drawstring 6 is made of steel wire rope. In other embodiments, ropes of other materials may also be used.

[0051] As can be seen from the above, in the present invention, after the porous positioning member 2 is placed in the transverse through hole 101 of the shielding body 1, the neutron source or filler can be placed into the accommodating hole 201 of the porous positioning member 2 from the first vertical hole 102, so that the neutron source and the filler are temporarily stored in the shielding body 1 through the porous positioning member 2. The shielding body 1 shields the neutron source. During the subsequent transportation process, the neutron source is all inside it, thereby reducing the radiation dose received by the staff during the transportation of the neutron source.

[0052] After the assembly device is transported to the laboratory where the neutron sensitivity calibration device for the off-core detector is located, it is aligned with the channel of the off-core detector neutron sensitivity calibration device where the line neutron source is placed. Then, by moving the porous positioning piece 2, the line neutron source and the filler can be dropped into the shell 302 of the line neutron source cladding 3. Then, the filler is loaded, and after tightening the shell cover 301, the line neutron source cladding 3 can be installed into the channel of the off-core detector neutron sensitivity calibration device where the line neutron source is placed. The entire assembly process is simple and quick, thereby improving assembly efficiency.

[0053] Example 2

[0054] This embodiment provides a method for assembling a linear neutron source for neutron sensitivity calibration of an ex-pile detector, using the assembly device provided in the first embodiment, and specifically comprising the following steps:

[0055] S1. Insert the porous positioning member 2 into the transverse through hole 101, and place the neutron source in sequence from the first vertical hole 102. At the same time, move the porous positioning member 2 so that it falls into each accommodating hole 201 of the porous positioning member 2 in sequence. That is, the neutron source is temporarily stored in the shielding body 1 through the porous positioning member 2, thereby reducing the radiation dose received by subsequent personnel during the transportation of the neutron source.

[0056] S2. After the neutron source is placed, the entire device is transported to the location of the neutron sensitivity calibration device for the ex-core detector. The second vertical hole is aligned with the hole of the neutron source on the placement line of the neutron sensitivity calibration device for the ex-core detector, and the entire device is fixed.

[0057] S3. Connect the shell cover 301 to the housing 302, and pass the drawstring 6 connected to the top of the shell cover 301 through the rope hole 502 of the operating handle 5. Tighten the drawstring 6 so that the slot 501 of the operating handle 5 fits with the block 3011 of the shell cover 301, thereby fixing the shell cover 301 and the housing 302 relative to each other and temporarily forming a whole.

[0058] S4. Insert the fixed linear neutron source cladding 3 and operating handle 5 from the third vertical hole 104. After the linear neutron source cladding 3 enters the second vertical hole 103, it is fixed by the fixing member 4. Rotate and lift the operating handle 5 to separate the shell cover 301 from the housing 302, and remove the shell cover 301.

[0059] S5. Move the porous positioning member 2 to allow the neutron sources in the accommodating holes 201 to fall into the shell 302 in sequence. Add fillers through the third vertical holes 104 and allow them to fall into the neutron source cladding 3. Then, use the operating handle 5 to tighten the shell cover 301 onto the shell 302.

[0060] S6. Loosen the pull rope 6 passed through the rope hole 502 of the operating handle 5 to separate the operating handle 5 from the linear neutron source cladding 3, release the fixation of the linear neutron source cladding 3 by the fixing component 4, and place the linear neutron source cladding 3 into the channel for placing the linear neutron source in the neutron sensitivity calibration device of the off-core detector by controlling the pull rope 6. Remove the pull rope 6 and move the assembly device to complete the assembly of the linear neutron source.

[0061] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A linear neutron source assembly device for neutron sensitivity calibration of an out-of-pile detector, characterized in that: include: The shielding body is provided with a transverse through hole, a first vertical hole is provided on the upper side of one end of the transverse through hole and is connected to the first vertical hole, a second vertical hole is provided on the lower side of the other end of the transverse through hole and is connected to the second vertical hole, and a third vertical hole is provided on the upper side of the transverse through hole corresponding to the second vertical hole; A porous positioning member is provided with a plurality of accommodating holes for accommodating neutron sources at intervals along its length. After the porous positioning member is placed in the transverse through hole, the neutron source can be placed into the accommodating holes through the first vertical hole; The linear neutron source cladding, after being placed in the second vertical hole, can receive the neutron source in the accommodating hole; the linear neutron source cladding comprises a shell and a shell cover, the shell cover is connected to the shell by threads, and a clamping block for transmitting torque is provided on the top of the shell cover; a fixing component connected to the shielding body and used for fixing or releasing the cladding of the linear neutron source; The operating handle can be placed in the third vertical hole, and the bottom is provided with a card slot that can cooperate with the card block.

2. The linear neutron source assembly device for neutron sensitivity calibration of an out-of-pile detector according to claim 1, characterized in that: The fixing component is a screw, and a transverse threaded hole communicating with the second vertical hole is provided on one side of the shielding body. The fixing component is connected to the transverse threaded hole and can press against the linear neutron source cladding placed in the second vertical hole.

3. The linear neutron source assembly device for neutron sensitivity calibration of an out-of-pile detector according to claim 1, characterized in that: A drawstring is connected to the top of the shell cover, and a rope hole for passing the drawstring is provided in the center of the operating handle, so that the shell cover and the operating handle are relatively fixed.

4. The linear neutron source assembly device for neutron sensitivity calibration of an out-of-core detector according to any one of claims 1 to 3, characterized in that: The cross section of the clamping block perpendicular to the axis of the shell cover is a polygonal structure.

5. The linear neutron source assembly device for neutron sensitivity calibration of an out-of-core detector according to claim 4, characterized in that: The cross section of the clamping block perpendicular to the axis of the shell cover is a rectangular structure.

6. The linear neutron source assembly device for neutron sensitivity calibration of an out-of-core detector according to any one of claims 1 to 3, characterized in that: The cross section of the porous positioning piece perpendicular to the length direction is a polygonal structure.

7. The linear neutron source assembly device for neutron sensitivity calibration of an out-of-pile detector according to claim 6, characterized in that: The cross section of the porous positioning piece perpendicular to the length direction is a rectangular structure.

8. The linear neutron source assembly device for neutron sensitivity calibration of an out-of-core detector according to any one of claims 1 to 3, characterized in that: The accommodating hole is a tapered hole that is larger at the top and smaller at the bottom.

9. The linear neutron source assembly device for neutron sensitivity calibration of an out-of-core detector according to any one of claims 1 to 3, characterized in that: The top ends of the first vertical hole, the second vertical hole and the third vertical hole are all provided with tapered guide portions.

10. A method for assembling a linear neutron source for neutron sensitivity calibration of an out-of-pile detector, using the assembly device according to claim 3, characterized in that: The following steps are involved: S1. Insert the porous positioning member into the transverse through hole, and place the neutron sources sequentially into the first vertical hole while moving the porous positioning member so that the neutron sources sequentially fall into the respective receiving holes of the porous positioning member; S2. After the neutron source is placed, the entire device is transported to the location of the neutron sensitivity calibration device for the ex-core detector. The second vertical hole is aligned with the hole of the neutron source on the placement line of the neutron sensitivity calibration device for the ex-core detector, and the entire device is fixed. S3. Connect the shell cover to the housing, pass the drawstring connected to the top of the shell cover through the rope hole of the operating handle, and tighten the drawstring to make the card slot of the operating handle fit with the card block of the shell cover; S4. Insert the fixed linear neutron source cladding and operating handle from the third vertical hole. After the linear neutron source cladding enters the second vertical hole, fix it with a fixing member. Rotate and lift the operating handle to separate the shell cover from the shell body, and then remove the shell cover. S5. Move the porous positioning member to allow the neutron sources in the accommodating holes to fall into the shell in sequence, and place the filler through the third vertical hole so that it falls into the cladding of the linear neutron source. Then, use the operating handle to tighten the shell cover onto the shell. S6. Loosen the pull rope passed through the rope hole of the operating handle to separate the operating handle from the linear neutron source cladding, release the fixing component from the linear neutron source cladding, and place the linear neutron source cladding into the channel of the neutron sensitivity calibration device of the off-core detector by controlling the pull rope. Remove the pull rope and move the assembly device away.

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