Initial charging detector mounting and positioning structure in reactor pool, monitoring system and working method

Abstract

The embodiment of the invention discloses an installation and positioning structure, a monitoring system and a working method for a detector for primary charging in a reactor pool, the structure comprises a detector installation and positioning assembly, the detector installation and positioning assembly is used for measuring the height position of the detector assembly in a reactor core, and the detector assembly is used for detecting the height position of the detector assembly; adjusting equipment or personnel can adjust the detector assembly to the position where the detection active area covers the neutron source according to the height position. By implementing the detector mounting and positioning structure provided by the embodiment of the invention, the problem that the measurement result is affected due to the inaccurate mounting position of the detector in the mounting process of the detector in the primary charging monitoring system in the reactor pool can be solved.

Description

Technical Field

[0001] The present invention relates to the field of radiation detection technology, and in particular to an installation and positioning structure, a monitoring system and a working method of a primary charging detector in a reactor pool. Background Art

[0002] The first fuel loading is to place the nuclear fuel assembly safely and accurately at the predetermined position of the reactor according to the design requirements and the approved loading procedure to form the reactor core and mark the start of the operation of the nuclear power plant. In view of the high safety requirements of the first loading process, in addition to relying on the fixed off-core nuclear instrument system to monitor the neutron count rate, the initial loading monitoring system must be installed for additional monitoring; the main function of this monitoring system is to monitor the neutron injection rate and its changes in the core in real time during the first loading process of the reactor, so as to realize the supervision of the subcritical state of the reactor and ensure that no critical or supercritical accidents will occur during the loading process, so as to ensure the nuclear safety of the fuel loading process. The system consists of a signal processing cabinet and multiple detectors, and the detectors are connected to the cabinet by cables.

[0003] Since the core neutron flux level is low during the loading process, in order to more accurately reflect the core status, the initial loading monitoring system needs to receive as many neutrons as possible. Therefore, the sensitive section of the detector assembly needs to be aligned with the neutron source to obtain the best detection efficiency. At present, the installation and positioning of the initial loading detector mainly rely on the estimation of the core geometry and the cable lowering length, and lacks relevant auxiliary technology or equipment for precise positioning. This installation is highly dependent on manual calculation and estimation, which may lead to measurement and installation deviations. Since the cable will inevitably bend, systematic deviations are also difficult to avoid. In addition, there is currently no tool that displays the height position information in real time to guide the test personnel to fine-tune the detector position. In the case of excessive position deviation, the sensitive section of the detector cannot be aligned with the neutron source, resulting in a low measured neutron count rate, affecting the accuracy of the measurement.

[0004] Therefore, it is necessary to design a new structure to solve the problem that the measurement results are affected by inaccurate detector installation positions during the installation of the detectors in the initial fuel loading monitoring system in the reactor pool. Summary of the invention

[0005] The purpose of the present invention is to overcome the defects of the prior art and provide an installation and positioning structure, a monitoring system and a working method for a primary charging detector in a reactor pool.

[0006] To solve the above technical problems, the objective of the present invention is achieved through the following technical solutions: providing a detector installation and positioning structure for initial loading in a reactor water pool, comprising: a detector installation and positioning assembly, the detector installation and positioning assembly being used to measure the height position of the detector assembly in the core, so that the adjustment equipment or personnel can adjust the detector assembly according to the height position to the position where the detection active area covers the neutron source.

[0007] Its further technical solution is: the detector installation and positioning assembly is installed on the edge of the pressure vessel of the core; the detector installation and positioning assembly includes a bracket, a rangefinder and a moving assembly, and the moving assembly is connected to the rangefinder; the moving assembly is connected to the bracket.

[0008] Its further technical solution is: the moving component includes a transverse moving component and a longitudinal moving component, both ends of the transverse moving component are respectively connected to the longitudinal moving component, the longitudinal moving component is connected to the bracket, and the rangefinder is connected to the transverse moving component.

[0009] A further technical solution is as follows: the lateral movement assembly comprises a first slider, a lateral guide rail and a first power source, the first power source is connected to the lateral guide rail, and the rangefinder is connected to the lateral guide rail via the first slider.

[0010] Its further technical solution is: the longitudinal moving component includes two longitudinal guide rails, a second power source and two second sliders, the second power source is respectively connected to the two longitudinal guide rails; the two ends of the transverse guide rail are respectively connected to the two longitudinal guide rails through the second sliders.

[0011] A further technical solution is as follows: the detector installation and positioning assembly also includes a control junction box; the first power source, the second power source and the rangefinder are respectively connected to the control junction box.

[0012] A further technical solution is as follows: the detector installation and positioning assembly also includes a display controller, and the display controller is connected to the control junction box.

[0013] A further technical solution is: an end of the longitudinal guide rail away from the second power source extends to above the reactor pool, and an end of the longitudinal guide rail away from the second power source is 2 meters away from the side wall of the reactor pool.

[0014] In addition, in order to overcome the defects of the prior art, the present invention also provides a monitoring system, including: a detector assembly, a cabinet and the above-mentioned detector installation and positioning assembly, the detector assembly is used to measure the neutron count rate in the pile, and the detector assembly is installed in the core; the cabinet is connected to the detector assembly; the detector assembly is a detector containing an integrated cable.

[0015] In addition, in order to overcome the defects of the prior art, the present invention also provides a working method performed by the above-mentioned initial charging detector installation and positioning structure in the reactor water pool, comprising:

[0016] The detector installation and positioning assembly measures the height position of the detector assembly in the core, so that the adjustment equipment or personnel adjust the detector assembly to a position where the detection active area covers the neutron source according to the height position.

[0017] Compared with the prior art, the present invention has the following beneficial effects: the present invention uses a detector installation positioning assembly to accurately measure the height position of the detector in the core. The assembly realizes flexible adjustment of the detector height through the combination of a bracket, a rangefinder and a moving assembly, thereby ensuring that it covers the neutron source in the active area. The structure of the lateral and longitudinal moving assembly is further adopted to enhance the accuracy and stability of the adjustment. The automatic monitoring and adjustment of the system is realized by controlling the junction box and the display controller, which improves the accuracy of the measurement results and comprehensively solves the problem of the measurement results being affected by the inaccurate installation position of the detector during the installation of the detector in the initial loading monitoring system in the reactor pool.

[0018] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying any creative work.

[0020] Figure 1 A schematic diagram of the three-dimensional structure of a detector installation and positioning assembly provided in an embodiment of the present invention;

[0021] Figure 2 A schematic diagram of the three-dimensional structure of a monitoring system provided by an embodiment of the present invention;

[0022] Description of the symbols in the figure:

[0023] 10. Detector installation and positioning assembly; 101. First power source; 102. Longitudinal guide rail; 103. Rangefinder; 104. Bracket; 105. Control junction box; 106. Display controller; 107. Second power source; 108. First slider; 20. Detector assembly; 30. Cabinet. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions 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. 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.

[0025] It should be understood that when used in this specification and the appended claims, the terms "include" and "comprises" indicate the presence of described features, integers, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or combinations thereof.

[0026] It should also be understood that the terms used in this specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the specification of the present invention and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0027] It should be further understood that the term "and / or" used in the present description and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0028] The detector assembly 20 of the existing initial loading monitoring system in the reactor pool relies on manual measurement of the cable length in advance for positioning during installation. However, due to the bending, slanting and stress deformation of the cable, the actual installation position is often not accurate enough. In the case of excessive position deviation, the sensitivity section of the detector cannot be aligned with the neutron source, resulting in a low measured neutron count rate, affecting the measurement accuracy.

[0029] To this end, an embodiment of the present invention provides an installation and positioning structure for the initial charging detector in the reactor pool, which improves the installation accuracy of the detector by real-time measurement and display of the detector position information, and ensures that the detector can be aligned with the neutron source to obtain the best measurement effect.

[0030] Specifically, the initial loading detector installation and positioning structure in the reactor pool is composed of a detector installation and positioning assembly 10, which is intended to measure the height position of the detector assembly 20 in the core so as to adjust the equipment or personnel for accurate positioning. The assembly includes a bracket 104, a rangefinder 103 and a moving assembly. The moving assembly has lateral and longitudinal movement functions. The lateral moving assembly includes a slider, a guide rail and a power source, and the longitudinal moving assembly is composed of a guide rail and a slider to ensure the flexible adjustment of the detector in the pool. It is also equipped with a control junction box 105 and a display controller 106 to achieve more effective operation and monitoring.

[0031] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0032] See also Figure 1 , Figure 1 A schematic diagram of the three-dimensional structure of a detector installation and positioning assembly 10 provided in an embodiment of the present invention; a detector installation and positioning structure for initial loading in a reactor water pool, comprising: a detector installation and positioning assembly 10, the detector installation and positioning assembly 10 is used to measure the height position of the detector assembly 20 in the core, so that the adjustment equipment or personnel can adjust the detector assembly 20 to the position where the detection active area covers the neutron source according to the height position.

[0033] The detector installation and positioning assembly 10 is used to emit laser to detect the signal fed back by the detector assembly 20 in real time, so as to position the detector assembly 20 and display the height position, so as to facilitate the adjustment of equipment or personnel to adjust the detector assembly 20 in real time to the position where the detection active area covers the neutron source.

[0034] In one embodiment, see Figure 1 The above-mentioned detector installation and positioning assembly 10 is installed on the edge of the pressure vessel of the core; the detector installation and positioning assembly 10 includes a bracket 104, a rangefinder 103 and a moving assembly, and the moving assembly is connected to the rangefinder 103; the moving assembly is connected to the bracket 104.

[0035] In this embodiment, by installing the detector installation and positioning assembly 10 on the edge of the pressure vessel of the core, the height position of the detector assembly 20 in the core can be effectively monitored to ensure that its sensitive section is accurately aligned with the neutron source, thereby improving the accuracy and effect of the measurement. Secondly, the structure adopts a simple structure, which is convenient for quick installation and removal, saving time and labor costs.

[0036] In one embodiment, see Figure 1 The above-mentioned moving assembly includes a transverse moving assembly and a longitudinal moving assembly. The two ends of the transverse moving assembly are respectively connected to the longitudinal moving assembly. The longitudinal moving assembly is connected to the bracket 104. The rangefinder 103 is connected to the transverse moving assembly.

[0037] In one embodiment, see Figure 1 The above-mentioned lateral movement assembly includes a first slider 108, a lateral guide rail and a first power source 101. The first power source 101 is connected to the lateral guide rail, and the rangefinder 103 is connected to the lateral guide rail through the first slider 108.

[0038] In one embodiment, see Figure 1 The above-mentioned longitudinal moving assembly includes two longitudinal guide rails 102, a second power source 107 and two second sliders. The second power source 107 is respectively connected to the two longitudinal guide rails 102; the two ends of the transverse guide rail are respectively connected to the two longitudinal guide rails 102 through the second sliders.

[0039] The moving assembly is composed of a transverse and longitudinal moving assembly, providing a full range of adjustment capabilities. The transverse moving assembly is connected to the transverse guide rail through the first slider 108, and is driven by the first power source 101, so that the rangefinder 103 can move freely in the horizontal direction; the longitudinal moving assembly is composed of two longitudinal guide rails 102, a second power source 107 and two second sliders. The second power source 107 is responsible for driving the longitudinal guide rails 102, so that the transverse guide rails can adjust their positions in the vertical direction; the rangefinder 103 is fixed on the transverse guide rail through the first slider 108, and can accurately measure the height as the transverse moving assembly moves. Through this combination, the rangefinder 103 can be accurately positioned in three-dimensional space; the design allows the rangefinder 103 to move freely in different directions, ensuring that the height position of the detector in the core can be accurately measured, thereby improving the accuracy and reliability of the measurement; the combination of lateral and longitudinal moving components makes the system very flexible, able to adapt to different operational requirements and environmental changes, and convenient for practical application; the structure is simple, easy to install and dismantle, and the operation process is relatively intuitive, reducing labor costs and time consumption; real-time monitoring can be easily carried out to ensure that data can be recorded in a timely manner during the fuel loading process, thereby enhancing nuclear safety and traceability of operations.

[0040] This structure not only improves the efficiency and accuracy of measurement, but also ensures the safety and reliability during reactor fuel loading.

[0041] In one embodiment, the distance meter 103 includes a laser distance meter 103; the laser distance meter 103 performs continuous measurement at a frequency of 1 Hz, and displays and records distance information in real time. This frequency can ensure timely update of data, so that operators can obtain measurement results at any time, which is convenient for real-time monitoring and data analysis.

[0042] In one embodiment, the first power source 101 and the second power source 107 are both stepper motors; the transverse guide rail and the longitudinal guide rail 102 are driven by stepper motors respectively, providing high-precision position control. The use of stepper motors allows the laser rangefinder 103 to move stably on a set path, thereby ensuring the accuracy and repeatability of the measurement. This precise control is particularly important for measurements in complex environments such as nuclear power plants, and can effectively avoid errors caused by position deviations.

[0043] The guide rail is fixed to the bracket 104 by hand screws, so that the system can be quickly installed and disassembled. This design greatly facilitates the operation of the on-site staff, saves installation time, and improves work efficiency. When the equipment needs to be adjusted or rearranged, the change can be completed quickly.

[0044] The guide rails are made of lightweight aluminum alloy, which has excellent strength and good durability. The lightweight design not only reduces the overall weight of the system, making it easier to transport and install, but also ensures flexible operation in a small space. In addition, the use of aluminum alloy enhances the corrosion resistance of the system and adapts to the special requirements of the nuclear power site environment.

[0045] In one embodiment, see Figure 1 The detector installation and positioning assembly 10 further includes a control junction box 105 ; the first power source 101 , the second power source 107 and the rangefinder 103 are respectively connected to the control junction box 105 .

[0046] In one embodiment, see Figure 1 The detector installation and positioning assembly 10 further includes a display controller 106 , and the display controller 106 is connected to the control junction box 105 .

[0047] The structure is equipped with a display controller 106, allowing the operator to control the movement of the laser rangefinder 103 at a long distance. This remote control function is particularly suitable for complex and restricted field environments, ensuring the safety and flexibility of operation. Through the controller, the user can easily adjust the position of the rangefinder 103 to adapt to different measurement needs.

[0048] The overall design is designed to meet the needs of the complex and narrow environment of nuclear power sites, ensuring smooth operation under various conditions. The lightweight structure makes the equipment easy to carry and deploy, suitable for use in changing working environments.

[0049] The structure of this embodiment not only improves the measurement efficiency of the laser rangefinder 103, but also ensures the convenience and safety of operation, and is suitable for application in specific fields such as nuclear power.

[0050] In one embodiment, the control junction box 105 is built with a laser ranging system, a position control system and a power drive system. The laser ranging system is connected to the rangefinder 103, the first power source 101 and the second power source 107 are respectively connected to the power drive system, and the position control system is connected to the display controller 106. The first power source 101, the second power source 107, and the rangefinder 103 are respectively provided with power and signal control by the box. The control junction box 105 is responsible for integrating the laser ranging system, the position control system and the power drive system to ensure that each device works in coordination.

[0051] In one embodiment, one end of the longitudinal guide rail 102 away from the second power source 107 extends to above the reactor pool, and the end of the longitudinal guide rail 102 away from the second power source 107 is 2 meters away from the side wall of the reactor pool.

[0052] One end of the longitudinal guide rail 102 extends about 2 meters out of the pool and is driven by the second power source 107. The second power source 107 controls the longitudinal guide rail 102 to ensure that the laser rangefinder 103 can move smoothly along the longitudinal guide rail 102 so that it is accurately positioned directly above the initial charging detector. This design ensures the accuracy and repeatability of the measurement.

[0053] After being correctly positioned, the rangefinder 103 can measure and display the vertical height information of the detector assembly 20 in real time by emitting a laser beam to hit the reflective surface of the detector assembly 20. This measurement method avoids direct contact and ensures the safety of operation.

[0054] The display controller 106 is connected to the control junction box 105, allowing the operator to remotely monitor and control the distance meter 103 at a long distance. The control panel on the display controller 106 allows the user to easily command the laser distance meter 103 on the guide rail to move to locate and measure the position of the initial charging detector and its installation depth.

[0055] Except for the display controller 106, all other devices are fixed on the bracket 104. This fixing design not only improves the stability of the device and reduces the measurement error caused by vibration or other external factors, but also ensures the reliable operation of the device in a complex environment.

[0056] The operator inputs the measurement instruction through the interface on the display controller 106; the first power source 101 and the second power source 107 are started to control the transverse guide rail and the longitudinal guide rail 102, the laser rangefinder 103 emits laser, continuously detects the reflected signal, determines that the rangefinder 103 moves to directly above the detector, and detects the signal reflected by the detector, and the rangefinder 103 calculates the vertical height information of the detector in real time and displays it on the display controller 106.

[0057] Of course, considering that the reflected signal may be from other objects, there will not be a large position error when installing the detector assembly 20, that is, the calculated distance of the reflected signal is not much different from the position of the detector assembly 20, so as to distinguish whether the reflected signal is generated by the detector assembly 20 or other objects. The structure of this embodiment is mainly used for fine position adjustment after the installation of the detector assembly 20, so as to further accurately adjust the position of the detector assembly 20.

[0058] Through the above system components and their collaboration, the system achieves efficient and accurate measurement of the initial loading detectors in the reactor fuel pool, greatly improving work efficiency and safety.

[0059] The above-mentioned initial charging detector installation and positioning structure in the reactor water pool uses the detector installation and positioning component 10 to accurately measure the height position of the detector in the core. The component realizes flexible adjustment of the detector height through the combination of the bracket 104, the rangefinder 103 and the moving component, thereby ensuring that it covers the neutron source in the active area. The structure of the lateral and longitudinal moving components is further adopted to enhance the accuracy and stability of the adjustment. The automatic monitoring and adjustment of the system is realized by controlling the junction box 105 and the display controller 106, which improves the accuracy of the measurement results and comprehensively solves the problem that the measurement results are affected by the inaccurate installation position of the detector during the installation of the detector in the initial charging monitoring system in the reactor water pool.

[0060] In one embodiment, see Figure 2 , a monitoring system is also provided, including: a detector assembly 20, a cabinet 30 and the above-mentioned detector installation and positioning assembly 10, the detector assembly 20 is used to measure the neutron count rate in the reactor, and the detector assembly 20 is installed in the core; the cabinet 30 is connected to the detector assembly 20; the detector assembly 20 is a detector with an integrated cable.

[0061] The cabinet 30 mainly realizes the functions of power supply, measurement signal processing, display and alarm of the detector assembly 20. The detector assembly 20 is used to measure the neutron counting rate in the pile.

[0062] The cabinet 30 provides the necessary working power supply for the detector, receives its measurement signals, and calculates the counting rate of the core neutron flux level by processing these signals. The cabinet 30 has display and alarm functions inside, which can provide the loading operator with key information such as core parameters and status warnings. The detector assembly 20 usually uses a proportional counter, such as a 3He proportional counter tube or a boron-coated proportional counter tube, as a neutron detector, and is equipped with an integrated cable to achieve connection with the cabinet 30. The detector installation and positioning assembly 10 is used to measure and monitor the height position of the detector assembly 20 in the core, so that its detection active area covers the neutron source position, ensures the measurement effect and accuracy, and ensures the nuclear safety of the fuel loading process.

[0063] In one embodiment, a working method performed by the above-mentioned initial charging detector installation and positioning structure in the reactor water pool is also provided, comprising:

[0064] The detector installation and positioning assembly 10 measures the height position of the detector assembly 20 in the core, so that the adjusting equipment or personnel adjust the detector assembly 20 to a position where the detection active area covers the neutron source according to the height position.

[0065] The detector assembly 20 in the monitoring system of this embodiment can accurately measure the neutron counting rate in the core, ensure real-time monitoring of the neutron flux level, and improve the accuracy of the data; the close connection between the cabinet 30 and the detector assembly 20 integrates the power supply, signal processing, display and alarm functions, simplifies the system operation and improves efficiency; the height measurement of the detector installation positioning assembly 10 ensures that the active area of ​​the detector covers the neutron source, which helps to improve the accuracy of the measurement and thus ensure nuclear safety during the fuel loading process; the display and alarm functions inside the cabinet 30 provide operators with real-time core parameter and status warnings, help to promptly discover and deal with potential problems, and further improve operational safety; a proportional counter is used as the detector assembly 20, which has strong sensitivity and responsiveness and can adapt to different working environments and needs; the integrated cable design reduces the complexity of the connection, makes installation and maintenance more convenient, and reduces the workload of operators.

[0066] Overall, the design of the monitoring system not only improves the measurement accuracy and system safety, but also improves the convenience and efficiency of operation.

[0067] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the present invention, and these modifications or replacements should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A first-time charging detector installation and positioning structure in a reactor pool, characterized in that: include: The detector installation and positioning assembly is used to measure the height position of the detector assembly in the core, so that the adjustment equipment or personnel can adjust the detector assembly to the position where the detection active area covers the neutron source according to the height position.

2. The installation and positioning structure of the initial charging detector in the reactor pool according to claim 1, characterized in that: The detector installation and positioning assembly is installed at the edge of the pressure vessel of the core; the detector installation and positioning assembly includes a bracket, a rangefinder and a moving assembly, and the moving assembly is connected to the rangefinder; the moving assembly is connected to the bracket.

3. The installation and positioning structure of the initial charging detector in the reactor pool according to claim 2, characterized in that: The moving assembly comprises a transverse moving assembly and a longitudinal moving assembly, two ends of the transverse moving assembly are respectively connected to the longitudinal moving assembly, the longitudinal moving assembly is connected to the bracket, and the rangefinder is connected to the transverse moving assembly.

4. The installation and positioning structure of the initial charging detector in the reactor pool according to claim 3, characterized in that: The lateral movement assembly comprises a first slider, a lateral guide rail and a first power source, wherein the first power source is connected to the lateral guide rail, and the rangefinder is connected to the lateral guide rail via the first slider.

5. The installation and positioning structure of the initial charging detector in the reactor pool according to claim 4, characterized in that: The longitudinal moving assembly includes two longitudinal guide rails, a second power source and two second sliders, wherein the second power source is respectively connected to the two longitudinal guide rails; and the two ends of the transverse guide rail are respectively connected to the two longitudinal guide rails through the second sliders.

6. The installation and positioning structure for the initial charging detector in the reactor pool according to claim 5, characterized in that: The detector installation and positioning assembly also includes a control junction box; the first power source, the second power source and the rangefinder are respectively connected to the control junction box.

7. The installation and positioning structure for the initial charging detector in the reactor pool according to claim 6, characterized in that: The detector installation and positioning assembly also includes a display controller, and the display controller is connected to the control junction box.

8. The installation and positioning structure for the initial charging detector in the reactor pool according to claim 5, characterized in that: One end of the longitudinal guide rail away from the second power source extends to above the reactor water pool, and the end of the longitudinal guide rail away from the second power source is 2 meters away from the side wall of the reactor water pool.

9. A monitoring system, characterized in that: include: A detector assembly, a cabinet, and a detector installation and positioning assembly as described in any one of claims 1 to 8, wherein the detector assembly is used to measure the neutron count rate in the reactor and the detector assembly is installed in the core; the cabinet is connected to the detector assembly; the detector assembly is a detector containing an integrated cable.

10. A working method performed by the installation and positioning structure for the initial charging detector in the reactor water pool according to any one of claims 1 to 8, characterized in that: include: The detector installation and positioning assembly measures the height position of the detector assembly in the core, so that the adjustment equipment or personnel adjust the detector assembly to a position where the detection active area covers the neutron source according to the height position.

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