Linear neutron source assembling device and method for calibrating neutron sensitivity of out-of-pile detector

Abstract

The invention relates to the technical field of neutron sensitivity calibration of out-of-pile detectors, and provides a linear neutron source assembly device and method for neutron sensitivity calibration of an out-of-pile detector. A first vertical hole is formed in the upper side of one end of the transverse through hole, a second vertical hole is formed in the lower side of the other end, and a third vertical hole is formed in the upper side corresponding to the second vertical hole; the porous positioning piece is provided with accommodating holes at intervals along the length direction, and after the porous positioning piece is placed into the transverse through hole, the neutron source can be placed into the accommodating holes from the first vertical hole; the linear neutron source cladding is used for receiving the neutron source in the accommodating hole and comprises a shell and a shell cover, the shell cover is in threaded connection with the shell, and a clamping block used for transmitting torque is arranged at the top of the shell cover; the fixing component is used for fixing or loosening the linear neutron source cladding; the operating handle can be placed in the third vertical hole, and a clamping groove matched with the clamping block is formed in the bottom of the operating handle. According to the invention, the assembly efficiency can be improved, and the radiation dose of workers in the neutron source transfer process can be reduced.

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 a linear neutron source assembly device and method for neutron sensitivity calibration of an ex-pile detector. Background Art

[0002] In the design of nuclear reactors, the method of arranging external core detectors at different positions outside the core is used to monitor the state of the core neutron injection rate. This is also a commonly used method for online measurement of the core neutron injection rate level. The accuracy of the external core detector measurement will have a very significant impact on the safe operation of the reactor, so the neutron sensitivity of the detector must be calibrated.

[0003] When calibrating the neutron sensitivity of the ex-pile detector, it is necessary to use multiple neutron sources to form a linear neutron source on the calibration device to simulate the working environment of the ex-pile detector in the ex-pile detector channel. Since there are a large number of neutron sources (about twenty), there are fillers in the middle to determine the position of the neutron source, and the neutron radiation dose of the assembled linear neutron source is high, there is currently no assembly device specifically for linear neutron sources, the assembly efficiency of the workers is low, and the radiation dose is high. Therefore, how to design a special assembly device to reduce the workload of the assembly process and reduce the dose received by the workers during the neutron source reversal process is a problem that needs to be solved urgently in this field. Summary of the invention

[0004] The object of the present invention is to provide a linear neutron source assembly device and method for calibrating the neutron sensitivity of an out-of-core detector, so as to reduce the workload of the assembly process and reduce the dose received by the 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 out-of-core 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 to communicate with the first vertical hole, a second vertical hole is provided on the lower side of the other end of the transverse through hole to communicate with 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, which is provided with a plurality of accommodating holes for accommodating neutron sources at intervals along the length direction. After the porous positioning member is placed in the transverse through hole, the neutron source can be placed in the accommodating hole from the first vertical hole;

[0009] The neutron source shell is placed in the second vertical hole to receive the neutron source in the accommodating hole. The shell includes a shell and a shell cover. The shell cover is connected to the shell by threads. A block for transmitting torque is provided on the top of the shell cover.

[0010] A fixing component, which is connected to the shielding body and is used to fix or loosen 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, 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 direction of the shell cover is a polygonal structure.

[0015] Optionally, the cross section of the block perpendicular to the axis direction 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 a tapered guide portion.

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

[0021] S1, inserting the porous positioning member into the transverse through hole, and placing the neutron sources in sequence from the first vertical hole, while moving the porous positioning member so that the neutron sources fall into the respective receiving holes of the porous positioning member in sequence;

[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 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 match the card block of the shell cover;

[0024] S4, inserting the fixed wire neutron source shell and the operating handle from the third vertical hole, fixing the wire neutron source shell by the fixing component after entering the second vertical hole, rotating and lifting the operating handle, separating the shell cover from the shell body, and taking out the shell cover;

[0025] S5, move the porous positioning member to make the neutron sources in the accommodating holes fall into the shell in sequence, and put the filler into the third vertical hole to make it fall into the cladding of the linear neutron source, and then tighten the shell cover on the shell using the operating handle;

[0026] S6. Loosen the pull rope passed through the rope hole of the operating handle to separate the operating handle from the cladding of the linear neutron source, release the fixing of the linear neutron source cladding by the fixing components, put the cladding of the linear neutron source into the channel of the neutron sensitivity calibration device of the off-core detector where the linear neutron source is placed 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 the neutron source, and after the neutron source is placed in the transverse through hole of the shielding body, the neutron source or the filler can be placed in the accommodating hole from the first vertical hole, so that the neutron source and the filler are temporarily stored in the shielding body through the porous positioning member, and the shielding body shields the neutron source. In the subsequent transportation process, the neutron source is inside the neutron source, thereby reducing the radiation dose received by the staff during the transportation of the neutron source;

[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 neutron sensitivity calibration device for the extra-core detector where the linear neutron source is placed, and then by moving the porous positioning parts, the linear neutron source and the filler can be made to fall into the shell of the linear neutron source cladding, and then the filler is loaded. After tightening the shell cover, the linear neutron source cladding can be installed into the channel of the neutron sensitivity calibration device for the external detector where the linear neutron source is placed. The whole assembly process is simple and quick, which improves the 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 drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without 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 It is a schematic diagram of the structure of the shielding body;

[0032] Figure 3 is a schematic diagram of the structure of a porous positioning member;

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

[0034] Figure 5 is a schematic diagram of the structure of the cladding of the line 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-accommodating 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] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are 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 here 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 claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are 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, further definition and explanation thereof is not required 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 used. 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] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" 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 it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0041] Example 1

[0042] refer to Figure 1 This embodiment provides a linear neutron source assembly device for neutron sensitivity calibration of an out-of-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 communicating with the transverse through hole 101 is provided on the upper side of one end thereof, and the first vertical hole 102 is used for placing the neutron source into the channel, and a second vertical hole 103 communicating with the transverse through hole 101 is provided on the lower side of the other end thereof, and the second vertical hole 103 is used for placing 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, and the third vertical hole 104 is used for placing 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 the length direction. The accommodating holes 201 are tapered holes that are larger at the top and smaller at the bottom, so that the neutron sources can fall into them easily. It is easy to understand that the number of accommodating holes 201 is equal to or greater than the total number of all neutron sources to be installed, so as to ensure that all neutron sources can be temporarily stored in the porous positioning member 2. When in use, the porous positioning member 2 is placed in the transverse through hole 101, and the neutron source is placed in the first vertical hole 102. At the same time, the porous positioning member 2 is moved, so that the neutron source can be placed in each accommodating hole 201 in turn, and 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 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 arrangement prevents the porous positioning member 2 from rotating arbitrarily after being placed in the transverse through hole 101, resulting in the neutron source being unable to fall from the first vertical hole 102 into the receiving hole 201. Further, 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 wire neutron source cladding 3 is placed in the second vertical hole 103, it is fixed by the fixing component 4 for receiving the neutron source in the accommodating hole 201. The fixing component 4 is connected to the shielding body 1. As an option, the fixing component 4 in this embodiment is a screw. One side of the shielding body 1 is provided with a transverse threaded hole 105 connected to the second vertical hole 103. The fixing component 4 is connected to the transverse threaded hole 105 and pressed against the wire neutron source cladding 3 placed in the second vertical hole 103 to fix the wire neutron source cladding 3 in the second vertical hole 103. The screw can be loosened when it is away from the wire neutron source cladding 3. It is easy to understand that in other embodiments, the fixing component 4 can also adopt other structures. For example, the fixing component 4 is a pair of clamping blocks arranged at the bottom of the second vertical hole 103. The pair of clamping blocks can approach or move away from each other. When they approach each other, they clamp the wire neutron source cladding 3, and when they move away from each other, they loosen the wire neutron source cladding 3.

[0048] refer to Figure 4 and Figure 5 The 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 3011 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 at 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 axial direction of the shell cover 301 is a polygonal structure. On this basis, the cross section of the slot 501 perpendicular to the axial direction 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 axial direction of the shell cover 301 is a rectangular structure. Of course, in other embodiments, the cross section of the block 3011 perpendicular to the axial direction 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 cooperate to achieve the transmission of torque, of course, other structures can also be used to achieve it, for example, the block 3011 is provided with teeth around it, and the side wall of the slot 501 is provided with teeth grooves that engage with it.

[0050] In this embodiment, a drawstring 6 is connected to the top of the shell cover 301, and the connection method is detachable, such as tying a knot. The center of the operating handle 5 is provided with a rope hole 502 for passing the drawstring 6. The shell cover 301 and the operating handle 5 can be relatively fixed by passing the drawstring 6 through the rope hole 502 and tightening it. As an option, the drawstring 6 is a steel wire rope. In other embodiments, ropes of other materials can also be selected.

[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 receiving 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 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 extra-core detector is located, it is aligned with the channel of the extra-core detector neutron sensitivity calibration device for placing the linear neutron source, and then by moving the porous positioning piece 2, the linear neutron source and the filler can be made to fall into the shell 302 of the linear neutron source cladding 3, and then the filler is loaded. After tightening the shell cover 301, the linear neutron source cladding 3 can be installed into the channel of the extra-core detector neutron sensitivity calibration device for placing the linear neutron source. The whole assembly process is simple and fast, which improves the assembly efficiency.

[0053] Example 2

[0054] This embodiment provides a method for assembling a linear neutron source for neutron sensitivity calibration of an out-of-core 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 put the neutron source into the first vertical hole 102 in sequence, and move the porous positioning member 2 at the same time to make it fall into each receiving 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, so as to reduce the radiation dose received by subsequent staff 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 of the neutron sensitivity calibration device for the ex-core detector, and the entire device is fixed;

[0057] S3, connect the shell cover 301 with 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 to make the card slot 501 of the operating handle 5 match the card block 3011 of the shell cover 301, that is, the shell cover 301 and the housing 302 are relatively fixed and temporarily form a whole;

[0058] S4, insert the fixed wire neutron source cladding 3 and the operating handle 5 from the third vertical hole 104, fix the wire neutron source cladding 3 through the fixing component 4 after entering the second vertical hole 103, rotate and lift the operating handle 5, separate the shell cover 301 from the shell body 302, and take out the shell cover 301;

[0059] S5, move the porous positioning member 2 to make the neutron sources in the accommodating holes 201 fall into the shell 302 in sequence, and put the filler into the third vertical hole 104 to make it fall into the neutron source cladding 3, and then use the operating handle 5 to tighten the shell cover 301 on the shell 302;

[0060] S6. Loosen the pull rope 6 inserted into the rope hole 502 of the operating handle 5 to separate the operating handle 5 from the wire neutron source cladding 3, release the fixation of the wire neutron source cladding 3 by the fixing component 4, and put the wire neutron source cladding 3 into the channel of the neutron sensitivity calibration device of the off-core detector where the wire neutron source is placed by controlling the pull rope 6. Remove the pull rope 6 and move the assembly device away to complete the assembly of the wire neutron source.

[0061] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope 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 to communicate with the first vertical hole, a second vertical hole is provided on the lower side of the other end of the transverse through hole to communicate with 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, which is provided with a plurality of accommodating holes for accommodating neutron sources at intervals along the length direction. After the porous positioning member is placed in the transverse through hole, the neutron source can be placed in the accommodating hole from the first vertical hole; The neutron source shell is placed in the second vertical hole to receive the neutron source in the accommodating hole. The shell includes a shell and a shell cover. The shell cover is connected to the shell by threads. A block for transmitting torque is provided on the top of the shell cover. A fixing component, which is connected to the shielding body and is used to fix or loosen 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 rod, 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 cladding of the linear neutron source 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 at 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 block perpendicular to the axis direction 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 block perpendicular to the axis direction 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 a tapered guide portion.

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, inserting the porous positioning member into the transverse through hole, and placing the neutron sources in sequence from the first vertical hole, while moving the porous positioning member so that the neutron sources fall into the respective receiving holes of the porous positioning member in sequence; 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 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 match the card block of the shell cover; S4, inserting the fixed wire neutron source shell and the operating handle from the third vertical hole, fixing the wire neutron source shell by the fixing component after entering the second vertical hole, rotating and lifting the operating handle, separating the shell cover from the shell body, and taking out the shell cover; S5, move the porous positioning member to make the neutron sources in the accommodating holes fall into the shell in sequence, and put the filler into the third vertical hole to make it fall into the cladding of the linear neutron source, and then tighten the shell cover on the shell using the operating handle; S6. Loosen the pull rope passed through the rope hole of the operating handle to separate the operating handle from the cladding of the linear neutron source, release the fixing of the linear neutron source cladding by the fixing components, put the cladding of the linear neutron source into the channel of the neutron sensitivity calibration device of the off-core detector where the linear neutron source is placed by controlling the pull rope, remove the pull rope and move the assembly device away.

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