A neutron detector sensitivity calibration device and calibration method

Abstract

The present invention provides a calibration device and method for the sensitivity of a neutron detector, the calibration device comprising: a support assembly disposed in the core active area, provided with a second channel and a first channel; a transmission system for connecting the detector to be tested; a signal acquisition device for connecting a standard detector and the detector to be tested; wherein the second channel is used to accommodate the standard detector; the transmission system is used to transfer the detector to be tested to the first channel; the signal acquisition device is used to obtain the current value of the standard detector in the second channel, and the current value of the detector to be tested in the first channel. The calibration device of the present application is a self-powered type and does not require external power supply. At the same time, during the calibration test process of the present application, there is no need to start and stop the reactor, and the calibration test can be completed without affecting other operating tasks of the reactor. The calibration process does not require waiting, thereby significantly reducing the test cost.

Description

Technical Field

[0001] The invention relates to the field of nuclear reactor core parameter measurement, and in particular to a neutron detector sensitivity calibration device and a calibration method. Background Art

[0002] Neutron detectors are devices that detect neutrons by using charged particles generated by interaction with boron or uranium to ionize gases or by activating the material itself after neutron irradiation. Neutrons are widely used in nuclear power measurement or core neutron flux rate distribution measurement.

[0003] Neutron detector sensitivity is a key nuclear performance indicator for factory acceptance of neutron detectors. It reflects the ratio of the detector response current to the neutron flux density at the detector position. The consistency of neutron detector sensitivity closely affects the uncertainty of reactor core power distribution measurement. Therefore, it is usually necessary to conduct on-reactor tests with the help of research experimental reactors to calibrate the sensitivity of neutron detectors to ensure that the consistency of neutron detector sensitivity meets the design requirements.

[0004] In the related art, the sensitivity calibration of neutron detectors usually involves installing several detectors to be tested and several standard detectors on a detector bracket, placing the detector assembly into the test channel during reactor shutdown, and then waiting for the reactor power to reach a predetermined power before calibration can be carried out. After the calibration is completed, the reactor needs to be shut down and wait for a period of time, and the detector assembly can only be taken out after the reflective dose level of the detector decays to a certain extent. During this period, the reactor needs to stop performing other tasks, so the test efficiency is low and the test cost is very high. Summary of the invention

[0005] The present invention is made to solve the above technical problems, and its purpose is to provide a calibration device and a calibration method for the sensitivity of a neutron detector, which can improve the test efficiency and reduce the test cost.

[0006] In a first aspect, the present application discloses a neutron detector sensitivity calibration device, comprising:

[0007] A support assembly disposed in the core active area is provided with a second hole channel and a first hole channel;

[0008] A transmission system for connecting the detector to be tested;

[0009] A signal acquisition device, used for connecting a standard detector and a detector to be tested;

[0010] Among them, the second channel is used to accommodate a standard detector; the transmission system is used to transfer the detector to be tested to the first channel; the signal acquisition device is used to obtain the current value of the standard detector in the second channel and the current value of the detector to be tested in the first channel.

[0011] Optionally, the support assembly includes a mounting sleeve and a support body, the mounting sleeve is used to be arranged in the core active area, the support body is arranged in the inner cavity of the mounting sleeve, and the second channel and the first channel are both arranged in the support body.

[0012] Optionally, the first channel includes a receiving hole section and a guide hole section, the guide hole section and the receiving hole section are arranged in sequence in a direction away from the first channel opening, and the diameter of the guide hole section increases in a direction away from the receiving hole section.

[0013] Optionally, the transmission system is used to lower the detector to be tested into the first channel, and the descending direction of the detector to be tested is the direction of gravity; the calibration device also includes a guide block, and the detector to be tested and the guide block are arranged in sequence along the direction of gravity.

[0014] Optionally, the diameter of the second hole, the diameter of the guide block, and the diameter of the first hole increase gradually.

[0015] Optionally, the calibration device is provided with a disassembly and assembly station, and the transmission system includes a transmission device and a picking device, and the picking device is located at the disassembly and assembly station; the signal acquisition device is used to be detachably connected to the detector to be tested at the disassembly and assembly station; the picking device is used to detachably connect the detector to be tested at the disassembly and assembly station and the transmission device, and to transport the detector to be tested at the disassembly and assembly station; the transmission device is used to transport the detector to be tested between the disassembly and assembly station and the first channel.

[0016] Optionally, one first hole is provided and is located at the center of the support assembly.

[0017] In a second aspect, the present application discloses a method for calibrating the sensitivity of a neutron detector, which is used for calibrating a device. The calibration method comprises:

[0018] The support assembly is arranged in the core active area;

[0019] Fixing the standard detector in the second hole and connecting it to a signal acquisition device to obtain the current value generated by the standard detector;

[0020] Connect the detector to be tested to the transmission system and the signal acquisition device respectively;

[0021] Controlling the detector to be tested to enter the first channel;

[0022] Obtain the current value generated by the detector under test;

[0023] The neutron sensitivity of the detector to be tested is obtained based on the current value generated by the standard detector and the current value generated by the detector to be tested.

[0024] Optionally, the calibration device is provided with a disassembly and assembly station, and the transmission system includes a transmission device and a picking device;

[0025] Connecting the detector to be tested to the transmission system and the signal acquisition device respectively includes:

[0026] Connect the detector to be tested at the disassembly and assembly station with the transmission device;

[0027] Connect the detector to be tested at the disassembly and assembly station with the signal acquisition device;

[0028] Controlling the detector to be tested to enter the first channel includes:

[0029] Place the detector to be tested from the disassembly and assembly station into the first channel.

[0030] Optionally, after obtaining the neutron sensitivity of the detector to be tested based on the current value generated by the standard detector and the current value generated by the detector to be tested, the method further includes:

[0031] Lift the detector to be tested from the first channel to the disassembly and assembly station;

[0032] Separate the detector to be tested and the transmission device at the disassembly and assembly station;

[0033] Disconnect the detector to be tested and the signal acquisition device at the disassembly and assembly station;

[0034] Transfer the detector to be tested which is at the disassembly and assembly station.

[0035] Optionally, controlling the detector to be tested to enter the first channel includes:

[0036] Bundle multiple detectors to be tested into one;

[0037] Control a plurality of detectors to be tested that are bundled together to enter the first channel.

[0038] Optionally, obtaining the current value generated by the detector to be tested includes:

[0039] (a) The detector to be tested stays in the first channel until the current value measured by the detector to be tested stabilizes;

[0040] (b) obtaining the current value measured by the detector to be tested;

[0041] (c) rotating the support assembly according to a preset unit angle;

[0042] (d) returning to step (a) until the rotation reaches a preset number of times;

[0043] (e) Obtain the current value of each detector to be tested, the formula is:

[0044] ;

[0045] n is the number of rotations, is the measured current value of the detector under test after each rotation, is the measured current value obtained by the detector under test for the first time, is the current value of the detector to be tested.

[0046] The beneficial effects of the present invention are as follows:

[0047] The present application discloses a calibration device for the sensitivity of a neutron detector, comprising: a support assembly arranged in the active area of ​​a core, provided with a second channel and a first channel; a transmission system for connecting the detector to be tested; a signal acquisition device for connecting a standard detector and the detector to be tested; wherein the second channel is used to accommodate the standard detector; the transmission system is used to transfer the detector to be tested to the first channel; the signal acquisition device is used to obtain the current value of the standard detector in the second channel, and the current value of the detector to be tested in the first channel.

[0048] Thus, on the first aspect, the calibration device of the present application is of a self-powered type. Specifically, the detector to be tested and the standard detector can generate a current proportional to the neutron flux level in a neutron irradiation environment without the need for external power supply. On the second aspect, during the calibration test process of the present application, there is no need to start and stop the reactor, and the calibration test can be completed without affecting other operating tasks of the reactor. There is no need to wait during the calibration process, thereby significantly reducing the test cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] The above features and advantages of the present invention can be better understood after reading the detailed description of the embodiments of the present disclosure in conjunction with the following drawings. In the drawings, the components are not necessarily drawn to scale, and components with similar related properties or features may have the same or similar reference numerals.

[0050] Figure 1 It is a lifting diagram of the detector to be tested in the calibration device of the present invention;

[0051] Figure 2 It is a diagram of the reduction of the detector to be tested in the calibration device of the present invention;

[0052] Figure 3 is a structural diagram of the detector to be tested of the present invention;

[0053] Figure 4 It is a structural diagram of the support body of the present invention;

[0054] Figure 5 It is a schematic diagram of the transmission system of the present invention connected to the detector to be tested.

[0055] Description of reference numerals:

[0056] 1-input station, 2-disassembly station, 3-storage station,

[0057] 10- Reactor core active area,

[0058] 20-Support assembly,

[0059] 21- support body,

[0060] 211-First channel,

[0061] 2111-accommodating hole section, 2112-guide hole section,

[0062] 212- Second channel,

[0063] 22-Installation sleeve,

[0064] 31-Detector to be tested,

[0065] 311- the main body of the detector to be tested, 312- the cable of the detector to be tested,

[0066] 32-Standard detectors,

[0067] 321-Standard detector body, 322-Standard detector cable,

[0068] 40-Transmission system,

[0069] 41-Transmission device,

[0070] 411-reel, 4111-annular groove,

[0071] 412-Motor,

[0072] 413-Rope,

[0073] 42- Pickup device,

[0074] 50-Signal acquisition device,

[0075] 60-Guide block. DETAILED DESCRIPTION

[0076] The present invention is further described below in conjunction with specific embodiments and drawings. More details are set forth in the following description to facilitate a full understanding of the present invention. However, the present invention can obviously be implemented in a variety of other ways different from the description herein. Those skilled in the art can make similar generalizations and deductions based on actual application situations without violating the connotation of the present invention. Therefore, the protection scope of the present invention should not be limited by the content of this specific embodiment.

[0077] It should be noted that these and other subsequent drawings are only examples and are not drawn to scale, and should not be used to limit the actual protection scope of the present invention.

[0078] In the related art, the calibration of neutron detector sensitivity requires a period of time after the reactor is shut down and the detector assembly can be taken out only after the reflective dose level of the detector decays to a certain extent. During this period, the reactor needs to stop performing other tasks. Such a long waiting time will reduce the test efficiency and increase the test cost. Therefore, in order to solve such problems, the technical solution of this application is produced. Figure 1 to Figure 5 To elaborate:

[0079] like Figure 1 to Figure 3 As shown, the present application discloses a calibration device for the sensitivity of a neutron detector, including a support assembly 20, a transmission system 40 and a signal acquisition device 50. The present application uses a standard detector 32 as a reference to measure the neutron sensitivity of a detector to be tested 31, wherein the standard detector 32 is a detector whose neutron sensitivity has been calibrated. The standard detector 32 and the detector to be tested 31 have the same structure, and both include a main body and a cable; wherein the main body is a slender metal wire-like structure, and the main body is an emitter, an insulator and a collector which are sequentially sheathed from the inside to the outside, and the main body part is about 40-80cm long and has an outer diameter of about 2-4mm; the cable mainly includes a signal core wire, an insulator and a signal wire shell which are sequentially sheathed from the inside to the outside, and the outer diameter of the cable is about 1-2mm, and the length can reach 10-20m. The calibration process of the detector to be tested 31 is introduced below in combination with the specific structure of the calibration device of the present application:

[0080] As can be seen from the above, the standard detector 32 includes a main body 321 of the standard detector and a cable 322 of the standard detector connected to each other, and the detector to be tested 31 includes a main body 311 of the detector to be tested and a cable 312 of the detector to be tested connected to each other.

[0081] The support assembly 20 is as follows Figure 1 As shown, the support assembly 20 is inserted into the core active area 10 of the nuclear reactor, and the bottom of the support assembly 20 is kept at the same height as the bottom of the water pool in the core active area 10, and the support assembly 20 is provided with Figure 4 The second hole 212 and the first hole 211 are shown, wherein the second hole 212 is used to accommodate the main body 321 of the standard detector, and the first hole 211 is used to accommodate the main body 311 of the detector to be tested.

[0082] like Figure 1 and Figure 5 As shown, the signal acquisition device 50 is used to connect the cable 322 of the standard detector and the cable 312 of the detector to be tested. The transmission system 40 is used to connect the main body 311 of the detector to be tested to transfer the main body 311 of the detector to be tested to the first channel 211. For example, the transmission system 40 is a lifting device such as a winch to hoist the main body 311 of the detector to be tested from a high place away from the support assembly 20 into the first channel 211.

[0083] The main body 321 of the standard detector in the second channel 212 and the main body 311 of the detector to be tested in the first channel 211 are both located in the radiation environment of the core active area 10, so that the main body 321 of the standard detector and the main body 311 of the detector to be tested can generate a current proportional to the neutron flux level in the neutron irradiation environment, and transmit their respective current signals to the signal acquisition device 50 through the cable 322 of the standard detector and the cable 312 of the detector to be tested; the signal acquisition device 50 collects, processes and analyzes the received current signals, thereby respectively obtaining the current value of the standard detector 32 in the second channel 212 and the current value of the detector to be tested 31 in the first channel 211.

[0084] After obtaining the current value of the standard detector 32 and the current value of the detector to be tested 31, the neutron sensitivity of the detector to be tested 31 can be obtained according to the following formula:

[0085] ;

[0086] in, is the number of standard detectors 32; is the neutron sensitivity of the detector 31 to be tested; is the neutron sensitivity of the i-th standard detector 32; is the measured current value of the detector 31 to be tested; is the measured current value of the i-th standard detector 32.

[0087] In the calibration device, only one standard detector 32 can be set, that is, m=1, and at this time only one second channel 212 is set; of course, in order to improve the measurement accuracy, multiple second channels 212 can also be set, such as 2 or 4, and the multiple second channels 212 are evenly distributed around the first channel 211, and a standard detector 32 is set in each second channel 212, that is, m>1.

[0088] Thus, in the first aspect, the calibration device of the present application is of a self-powered type. Specifically, the detector to be tested 31 and the standard detector 32 can generate a current proportional to the neutron flux level in a neutron irradiation environment without the need for external power supply. In the second aspect, during the calibration test of the present application, there is no need to start and stop the reactor, and the calibration test can be completed without affecting other operating tasks of the reactor. There is no need to wait during the calibration process, thereby significantly reducing the test cost.

[0089] Optionally, a plurality of first holes 211 may be provided, and the plurality of first holes 211 are evenly distributed around the axial direction of the support assembly 20, and a detector 31 to be tested is placed in each first hole 211, so that the plurality of detectors 31 to be tested can be calibrated in batches, but since the positions of the detectors 31 to be tested are different when they are installed on the support assembly 20, the neutron flux levels at the positions of the detectors 31 to be tested are also different. In order to eliminate the influence of the difference in neutron flux levels at different positions on the calibration, a driving motor may be provided at the bottom of the support assembly 20, and the support assembly 20 is driven by the driving motor to rotate more than 10 times in the calibration test, for example, 7 times, each time by 45 degrees, and after each rotation, it is necessary to stop for 20-30 minutes to wait for the detector current to stabilize, and the initial measured current value and the measured current value after each rotation are recorded respectively, and the sum of the initial measured current value and the measured current value after each rotation is averaged to be the current value of the detector 31 to be tested.

[0090] Optionally, only one first hole 211 may be provided and located at the center of the support assembly 20. During each calibration, a single detector 31 to be tested may be placed in the first hole 211 for calibration, or multiple detectors 31 to be tested may be bundled together and placed in the first hole 211 for batch calibration. In this way, the detectors 31 to be tested are located at the same position on the detector bracket during each calibration, and there is no difference in neutron flux levels, so the support assembly 20 does not need to be rotated.

[0091] Alternatively, if Figure 1 As shown, the support assembly 20 includes a mounting sleeve 22 and a support body 21, both of which are made of aluminum. A hoisting structure can be set on the top of the mounting sleeve 22, and the mounting sleeve 22 is placed in the test channel reserved in the core active area 10 by a crane. A driving motor can be installed at the bottom of the mounting sleeve 22, and the driving motor drives the mounting sleeve 22 to rotate. The support body 21 is arranged in the inner cavity of the mounting sleeve 22. The second channel 212 and the first channel 211 are as shown in FIG. Figure 4 As shown, they are all arranged on the support body 21. One of the mounting sleeve 22 and the support body 21 is provided with a limit groove, and the other is provided with a limit stopper, which is accommodated in the limit groove so that the support body 21 and the mounting sleeve 22 rotate synchronously to prevent the support body 21 from rotating abnormally relative to the mounting sleeve 22.

[0092] In this way, on the one hand, the installation sleeve 22 can be preset to be retained in the core to provide a dry test environment, so that the support body 21 does not directly contact the core, and the maintenance and replacement of the support body 21 are convenient; on the second hand, the support body 21 is arranged at the bottom of the installation sleeve 22, and there is a hollow area between the support body 21 and the cavity of the installation sleeve 22. The detector 31 to be tested is lowered into the first channel 211 through the hollow area, thereby ensuring that the detector 31 to be tested can be lowered to a certain depth in the core, while reducing the processing length of the first channel 211; on the third hand, the detector 31 to be tested can descend rapidly at a first preset speed in the hollow area, and after entering the first channel 211, it can slowly descend at a second preset speed, so that the test rate can be increased while ensuring the alignment of the hole positions; it can be known that the first preset speed is greater than the second preset speed.

[0093] Optionally, the support body 21 can be further processed to form a hollow structure by grooving, drilling, etc., while retaining the second hole 212 and the first hole 211, so as to optimize the heat transfer performance of the support body 21, and avoid the detector 31 to be tested and the standard detector 32 from heating up and causing the local temperature to be too high, which affects the detector performance. Furthermore, a cooling flow channel for passing a cooling medium such as helium is provided in the support body 21 to improve the local temperature rise caused by the heating of the detector.

[0094] Optionally, the first channel 211 includes a accommodating hole section 2111 and a guide hole section 2112, and the guide hole section 2112 and the accommodating hole section 2111 are arranged in sequence in the direction away from the opening of the first channel 211, and the diameter of the guide hole section 2112 increases in the direction away from the accommodating hole section 2111 to form a funnel-shaped guiding structure.

[0095] The receiving hole section 2111 is used to receive the detector 31 to be tested, while the guide hole section 2112 is used to guide the detector 31 to be tested. Specifically, when the transmission system 40 is transferring the detector 31 to be tested to the first hole 211, the detector 31 to be tested will first enter the guide hole section 2112. Ideally, the detector 31 to be tested can directly enter the receiving hole section 2111 for calibration without contacting the guide hole section 2112. However, in actual operation, if the detector 31 to be tested is offset or skewed, it will contact the guide hole section 2112 and slide into the receiving hole section 2111 along the hole surface of the guide hole section 2112, so as to smoothly guide the detector 31 to be tested into the receiving hole section 2111.

[0096] Optionally, as described above, the transmission system 40 is used to lower the main body 311 of the detector to be tested into the first channel 211, and the descending direction of the main body 311 of the detector to be tested is the gravity direction. The calibration device also includes a guide block 60, which can be an aluminum sphere. The guide block 60 is used to connect the bottom of the main body 311 of the detector to be tested, and the main body 311 of the detector to be tested and the guide block 60 are arranged in sequence along the gravity direction.

[0097] The main body 311 of the detector to be tested usually has a certain toughness and may bend due to its storage method. In order to make it easier for the main body 311 of the detector to be tested to be placed in the first channel 211, the main body 311 of the detector to be tested should be kept vertical and the outer surface should be smooth as much as possible to reduce the resistance when the main body 311 of the detector to be tested is placed in the first channel 211. Therefore, the gravity of the guide block 60 can be relied on to straighten the main body 311 of the detector to be tested. In this way, with the assistance of the guide block 60, the main body 311 of the detector to be tested is not easy to be laterally offset or flipped, and can maintain a relatively stable posture and fall into the first channel 211 smoothly.

[0098] Optionally, the diameters of the second hole 212, the guide block 60, and the first hole 211 are increased in sequence. This can prevent the guide block 60 from mistakenly guiding the body 311 of the detector to be tested into the second hole 212, and ensure that the body 311 of the detector to be tested falls into the first hole 211 smoothly.

[0099] Alternatively, if Figure 5 As shown, the calibration device is provided with an input station 1, a disassembly station 2 and a storage station 3. The transmission system 40 includes a controller, a transmission device 41 and a picking device 42. The picking device 42 is located at the disassembly station 2. The controller is remotely connected to the transmission device 41 and the picking device 42. The transportation process of the detector 31 to be tested in the calibration device is as follows:

[0100] The detector 31 to be tested at the input station 1 can be transported to the disassembly station 2 by manual transport or picking up by the picking device 42;

[0101] The signal acquisition device 50 is used to be detachably connected to the detector 31 to be tested at the disassembly and assembly station 2. Specifically, when the detector 31 to be tested is at the disassembly and assembly station 2, the cable 312 of the detector to be tested can be manually connected to the signal acquisition device 50;

[0102] The picking device 42 can be a device for transferring such as a manipulator, and is used to detachably connect the main body 311 of the detector to be tested at the disassembly station 2 to the guide block 60 and the transmission device 41, respectively. Figure 1 and Figure 5 As shown;

[0103] The transmission device 41 is used to transfer the main body 311 of the detector to be tested from the disassembly and assembly station 2 to the first channel 211 to measure the current value of the detector to be tested 31 in the core active area 10, as shown in FIG. Figure 2 and Figure 5 As shown;

[0104] After measuring the current value of the detector 31 to be tested, the transmission device 41 transfers the main body 311 of the detector to be tested from the first channel 211 to the disassembly station 2, as shown in the following figure. Figure 1 and Figure 5 As shown;

[0105] The picking device 42 separates the main body 311 of the detector to be tested at the disassembly station 2 from the transmission device 41 and the guide block 60, and manually separates the cable 312 of the detector to be tested and the signal acquisition device 50;

[0106] The picking device 42 transfers the detector 31 to be tested at the disassembly station 2 to the storage station 3 for storage.

[0107] During calibration, the detector 31 to be tested will be activated by neutron irradiation from the core active area 10, generating a high radioactivity. Through the above-mentioned setting, the operator can remotely control the actions of the transmission device 41 and the pickup device 42 through the controller, thereby completing the calibration and transportation of the detector 31 to be tested, such as controlling the descending speed, ascending speed and residence time of the transmission device 41, and realizing the connection and disassembly between the guide block 60 and the transmission device 41 of the main body 311 of the detector to be tested through the pickup device 42, thereby preventing the operator from being irradiated by the core active area 10 and the detector 31 to be tested. As mentioned above, the cable 312 of the detector to be tested can be 20 meters in length, so when manually operating the cable 312 of the detector to be tested and the signal acquisition device 50 to be disassembled, the operator can also stay away from the main body 311 of the detector to be tested to avoid being irradiated.

[0108] Optionally, the transmission device 41 may be a hoisting mechanism and includes a drum 411, a motor 412 connected to the drum 411, a rope 413 wound around the drum 411, and a hook disposed at the end of the rope 413. The pickup device 42 is used to release or lock the main body 311 of the detector to be tested at the disassembly and assembly station 2 with the hook; the motor 412 can drive the drum 411 to rotate, so as to drive the main body 311 of the detector to be tested to be lifted and lowered between the disassembly and assembly station 2 and the first channel 211 through the rope 413 and the hook.

[0109] Optionally, the drum 411 is provided with an annular groove 4111, and the cable 312 of the detector to be tested is connected to the signal acquisition device 50 via the annular groove 4111. In this way, the direction of the cable 312 of the detector to be tested can be changed, the routing path of the cable 312 of the detector to be tested can be controlled, and the abnormalities such as crossing and entanglement between the cable 322 of the standard detector and the cable 312 of the detector to be tested, and between the cable 312 of the detector to be tested and the rope 413 can be avoided.

[0110] Combination Figure 1 to Figure 5 As shown, the present application also discloses a method for calibrating the sensitivity of a neutron detector, which is used for the above-mentioned calibration device. The calibration method includes:

[0111] Step S100: arranging the support assembly 20 in the core active region 10, including:

[0112] Step S110: presetting a test channel in the core active area 10;

[0113] Step S120: hoisting the device installation sleeve 22 into the test channel by a crane or the like, so that the bottom of the installation sleeve 22 and the bottom of the water pool of the core active area 10 are at the same height;

[0114] Step S130: Install the support body 21 into the installation sleeve 22;

[0115] Step S200: fix the main bodies 321 of the plurality of standard detectors in the plurality of second channels 212 one by one, and connect the cables 322 of the standard detectors to the signal acquisition device 50 to obtain the current value of the main body 321 of the standard detector; specifically, the main body 321 of the standard detector generates a current signal in the core active region 10, and the current signal is sent to the signal acquisition device 50 via the cables 322 of the standard detector, and then the current value is obtained by acquisition and analysis by the signal acquisition device 50;

[0116] Step S300: Figure 1 and Figure 5 As shown, the detector 31 to be tested is connected to the transmission system 40 and the signal acquisition device 50 respectively, including:

[0117] Step S310: The detector 31 to be tested is transferred from the input station 1 to the disassembly station 2 by manual transfer or picking up by the picking device 42;

[0118] Step S320: The picking device 42 connects the main body 311 of the detector to be tested at the disassembly and assembly station 2 to the guide block 60 and the transmission device 41 respectively, specifically, the top of the main body 311 of the detector to be tested is connected to the transmission device 41, and the bottom of the main body 311 of the detector to be tested is connected to the guide block 60;

[0119] Step S330: connecting the main body 311 of the detector to be tested at the disassembly and assembly station 2 to the signal acquisition device 50 through the cable 312 of the detector to be tested;

[0120] Step S400: Control the detector to be tested 31 to enter the first channel 211; specifically, the controller controls the motor 412 to drive the reel 411 to rotate, and then controls the guide block 60 and the main body 311 of the detector to be tested to be successively lowered from the disassembly and assembly station 2 to the accommodating hole section 2111, so that the main body 311 of the detector to be tested and the main body 321 of the standard detector are at the same height, as shown in FIG. Figure 2 and Figure 5 During this process, if the main body 311 of the detector to be tested is offset, the guide block 60 will contact the guide hole section 2112 and slide along the surface of the guide hole section 2112 to be guided into the receiving hole section 2111 by the guide hole section 2112;

[0121] Step S500: measuring the current value of the detector to be tested 31, including: keeping the detector to be tested 31 in the first channel 211 for a preset time until the measured current value of the detector to be tested 31 is stable, and obtaining the current value generated by the detector to be tested 31 after the current value is stable; specifically, the main body 311 of the detector to be tested generates a current signal in the core active area 10, and the current signal is sent to the signal acquisition device 50 through the cable 312 of the detector to be tested, and then the current value is obtained by the signal acquisition device 50 through collection and analysis;

[0122] Step S600: Based on the current value generated by the standard detector 32 and the current value generated by the detector 31 to be tested, the neutron sensitivity of the detector to be tested 31 is obtained, and the formula is:

[0123] ;

[0124] in, is the number of standard detectors 32; is the neutron sensitivity of the detector 31 to be tested; is the neutron sensitivity of the i-th standard detector 32; is the measured current value of the detector 31 to be tested; is the measured current value of the i-th standard detector 32.

[0125] Step S700: separating the calibrated detector 31 from related components, including:

[0126] Step S710: The transmission device 41 lifts the main body 311 and the guide block 60 of the detector to be tested from the first channel 211 to the disassembly station 2;

[0127] Step S720: the picking device 42 separates the main body 311 of the detector to be tested at the disassembly station 2 from the transmission device 41 and the guide block 60 respectively;

[0128] Step S730: manually disconnecting the cable 312 of the detector to be tested connected to the main body 311 of the detector to be tested at the disassembly and assembly station 2 and the signal acquisition device 50;

[0129] Step S800: the picking device 42 transfers the detector 31 to be tested at the disassembly station 2 to the storage station 3 for storage.

[0130] At this point, the calibration of the current detector 31 to be tested is completed, and then the process returns to step S300 to prepare for the calibration of the next detector 31 to be tested, until the calibration of all the detectors 31 to be tested is completed.

[0131] Optionally, only one first channel 211 may be provided and located at the center of the support assembly 20. During calibration, the detectors 31 to be tested may be placed into the first channel 211 one by one for calibration. To speed up the calibration efficiency, the detectors 31 to be tested may also be placed into the first channel 211 for calibration in batches. Then, step S400 includes:

[0132] Step S410: bundling the main bodies 311 of the multiple detectors to be tested into one;

[0133] Step S420: Control the main bodies 311 of the plurality of detectors to be tested that are bundled together to enter the first channel 211, so that the influence of the difference in neutron flux levels at different positions on the calibration of the detectors to be tested 31 can be eliminated;

[0134] After the calibration is completed, step S800 is: the picking device 42 transfers the multiple detectors 31 to be tested bundled together at the disassembly and assembly station 2 to the storage station 3 for storage.

[0135] Optionally, a plurality of first channels 211 may be provided to implement batch calibration of a plurality of detectors 31 to be tested, and the current value of each detector 31 to be tested may be measured as follows, that is, step S500 includes:

[0136] Step S510: The detector 31 to be tested stays in the first channel 211 for a preset time until the current value measured by the detector 31 to be tested is stable; the preset time is 20-30 minutes;

[0137] Step S520: obtaining the current value measured by the detector 31 to be tested;

[0138] Step S530: rotating the support assembly 20 according to a preset unit angle;

[0139] Step S540: Return to step S510 until the rotation reaches a preset number of times; for example, the preset number of times is 7 times, and the preset unit angle is 45°;

[0140] Step S550: Obtain the current value of the detector 31 to be tested, the formula is:

[0141] ;

[0142] n is the number of rotations, is the measured current value of the detector 31 after the jth rotation, is the initial measured current value of the detector 31 to be tested, in the formula is the average current value of the sum of the current values ​​of the detector 31 to be tested for multiple times. As the current value measured by the detector 31 under test in step S600 , substitute into the formula

[0143] ;

[0144] To calculate the neutron sensitivity of the detector 31 to be tested Each detector 31 to be tested calculates its own neutron sensitivity according to steps S510 to S550. In this way, the impact of the difference in neutron flux levels at different positions on the calibration can be eliminated while batch calibration is achieved for each detector 31 to be tested.

[0145] Although the present invention is disclosed as above with preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art may make possible changes and modifications without departing from the spirit and scope of the present invention. Therefore, any modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention shall fall within the protection scope defined by the claims of the present invention.

Claims

1. A neutron detector sensitivity calibration device, characterized in that: include: A support assembly (20) disposed in a core active region (10) is provided with a second hole channel (212) and a first hole channel (211); A transmission system (40) for connecting to the detector to be tested (31); A signal acquisition device (50) used to connect the standard detector (32) and the detector to be tested (31); The second hole (212) is used to accommodate a standard detector (32); the transmission system (40) is used to transfer the detector to be tested (31) to the first hole (211); and the signal acquisition device (50) is used to obtain the current value of the standard detector (32) in the second hole (212) and the current value of the detector to be tested (31) in the first hole (211); The first hole channel (211) comprises a receiving hole section (2111) and a guide hole section (2112), the guide hole section (2112) and the receiving hole section (2111) being arranged in sequence in a direction away from the hole opening of the first hole channel (211), and the diameter of the guide hole section (2112) increases in a direction away from the receiving hole section (2111); The transmission system (40) is used to lower the detector to be tested (31) into the first hole (211), and the descending direction of the detector to be tested (31) is the direction of gravity; The calibration device further comprises a guide block (60), wherein the detector to be tested (31) and the guide block (60) are arranged in sequence along the direction of gravity; The diameter of the second hole (212), the diameter of the guide block (60), and the diameter of the first hole (211) increase gradually.

2. The calibration device according to claim 1, characterized in that: The support assembly (20) comprises a mounting sleeve (22) and a support body (21); the mounting sleeve (22) is used to be arranged in the core active area (10); the support body (21) is arranged in the inner cavity of the mounting sleeve (22); and the second hole (212) and the first hole (211) are both arranged in the support body (21).

3. The calibration device according to claim 1, characterized in that: The calibration device is provided with a disassembly and assembly station (2), the transmission system (40) comprises a transmission device (41) and a picking device (42), and the picking device (42) is located at the disassembly and assembly station (2); The signal collection device (50) is used to be detachably connected to the detector to be tested (31) located at the disassembly and assembly station (2); The picking device (42) is used to detachably connect the detector to be tested (31) located at the disassembly and assembly station (2) and the transmission device (41), and to transport the detector to be tested (31) located at the disassembly and assembly station (2); The transmission device (41) is used to transfer the detector to be tested (31) between the disassembly and assembly station (2) and the first channel (211).

4. The calibration device according to claim 1, wherein one first channel (211) is provided and is located at a central position of the support assembly (20).

5. A method for calibrating the sensitivity of a neutron detector, used in the calibration device according to claim 1, characterized in that: Calibration methods include: The support assembly (20) is arranged in the core active area (10); Fixing a standard detector (32) in the second hole (212) and connecting the signal acquisition device (50) to obtain the current value generated by the standard detector (32); Connecting the detector to be tested (31) to the transmission system (40) and the signal acquisition device (50) respectively; Controlling the detector to be tested (31) to enter the first hole (211); Obtaining a current value generated by the detector to be tested (31); Based on the current value generated by the standard detector (32) and the current value generated by the detector (31) to be tested, the neutron sensitivity of the detector to be tested (31) is obtained.

6. The calibration method according to claim 5, characterized in that: The calibration device is provided with a disassembly and assembly station (2), and the transmission system (40) comprises a transmission device (41) and a picking device (42); The step of connecting the detector to be tested (31) to the transmission system (40) and the signal acquisition device (50) respectively comprises: Connecting the detector to be tested (31) located at the disassembly and assembly station (2) and the transmission device (41); Connecting the detector to be tested (31) located at the disassembly and assembly station (2) to the signal acquisition device (50); The step of controlling the detector to be tested (31) to enter the first hole (211) comprises: The detector to be tested (31) is introduced into the first channel (211) from the disassembly and assembly station (2).

7. The calibration method according to claim 6, characterized in that: After obtaining the neutron sensitivity of the detector to be tested (31) based on the current value generated by the standard detector (32) and the current value generated by the detector to be tested (31), the method further comprises: Lifting the detector to be tested (31) from the first hole (211) to the disassembly and assembly station (2); Separating the detector to be tested (31) and the transmission device (41) located at the disassembly and assembly station (2); Disconnecting the detector to be tested (31) and the signal collection device (50) located at the disassembly and assembly station (2); The detector to be tested (31) at the disassembly and assembly station (2) is transferred.

8. The calibration method according to claim 5, characterized in that: Controlling the detector to be tested (31) to enter the first hole (211) comprises: Bundling a plurality of the detectors (31) to be tested into one body; The plurality of detectors to be tested (31) bundled together are controlled to enter the first hole (211).

9. The calibration method according to claim 5, characterized in that: The step of obtaining the current value generated by the detector to be tested (31) comprises: (a) keeping the detector (31) to be tested in the first hole (211) until the current value measured by the detector (31) to be tested is stable; (b) obtaining a current value measured by the detector to be tested (31); (c) rotating the support assembly (20) according to a preset unit angle; (d) returning to step (a) until the rotation reaches a preset number of times; (e) Obtaining the current value of each of the detectors (31) to be tested, the formula is: ； n is the number of rotations, is the measured current value of the detector (31) to be tested after each rotation, is the measured current value initially obtained by the detector (31) to be tested, is the current value of the detector (31) to be tested.

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