Method for analyzing cold and hot state deviations of spnd probe measurement point positions, processing device and reactor core measurement system

Abstract

The present application relates to a SPND probe measuring point position cold-hot state deviation analysis method, a processing device and a reactor core measurement system, the method comprising: obtaining the length and expansion coefficient of N expansion regions divided in advance; obtaining a hot state temperature distribution map, a required position of a target SPND probe, a measuring point position and an expansion coefficient; calculating a cold state position deviation of the target SPND probe according to the length of each expansion region and the required position and measuring point position of the target SPND probe; and calculating a hot state position deviation of the target SPND probe according to the hot state temperature distribution map, the length and expansion coefficient of each expansion region, and the required position, measuring point position and expansion coefficient of the target SPND probe. The present application can accurately calculate the cold state position deviation and hot state position deviation of the SPND probe, and help the reactor core measurement system to correct the measuring point position of the SPND probe.

Description

Technical Field

[0001] This invention relates to the field of SPND detector measurement point position manipulation technology, and in particular to a method, processing equipment and core measurement system for analyzing the cold and hot state deviation of SPND detector measurement point positions. Background Technology

[0002] The Reactor Core Measurement System (RIC system) uses an integrated measurement module (SPND measurement module) inserted into the reactor core to measure the neutron flux level, providing a three-dimensional full flux distribution map of the core. This allows for real-time monitoring of core operating conditions and provides relevant core state parameter information for reactor fuel loading checks, fuel assembly burnup monitoring, external nuclear instrument calibration, and providing operational support functions. However, the SPND measurement module (each SPND measurement module includes seven SPND detectors arranged at different heights) is installed in an instrument guide tube. The instrument guide tube, SPND measurement module, and fuel assemblies experience varying degrees and directions of expansion at different temperature plateaus, causing changes in the corresponding positions of the SPND detectors and fuel assemblies. These changes introduce measurement deviations, affecting the calculation of core state parameter uncertainties. Excessive deviations can lead to excessive core state parameter uncertainties, failing to meet measurement requirements and impacting the normal operation of the nuclear power plant. Currently, nuclear power plants urgently need a solution to determine the cold and hot state position deviations of the SPND detectors. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a method, processing equipment and core measurement system for analyzing the cold and hot state deviation of SPND detector measurement point positions.

[0004] The technical solution adopted by this invention to solve its technical problem is: to construct a method for analyzing the cold and hot state deviation of the measurement point position of an SPND detector, including:

[0005] Obtain the length and expansion coefficient of the pre-divided N expansion zones; wherein, the N expansion zones are set as multiple expansion zones with different expansion coefficients obtained by dividing the pressure vessel, and N is a natural number greater than 1;

[0006] Obtain the thermal temperature distribution map, the required location of the target SPND detector, the location of the measuring point, and the coefficient of thermal expansion;

[0007] The cold position deviation of the target SPND detector is calculated based on the length of each expansion zone and the required position and measurement point position of the target SPND detector.

[0008] The thermal position deviation of the target SPND detector is calculated based on the thermal temperature distribution map, the length and expansion coefficient of each expansion zone, and the required position, measurement point position and expansion coefficient of the target SPND detector.

[0009] Preferably, the position coordinate is the length from the center position of the target SPND detector to the upper surface of the lower core plate of the pressure vessel.

[0010] Preferably, in the step of calculating the cold-state position deviation of the target SPND detector based on the length of each expansion zone and the required position and measurement point position of the target SPND detector, the expression for the cold-state position deviation is:

[0011] Pc = H - (L1 + L2 + ... + LN - Lm), where Pc represents the cold-state position deviation, H represents the measurement point position of the target SPND detector, Lm represents the required position of the target SPND detector, L1 represents the length of the first expansion zone, L2 represents the length of the second expansion zone, and LN represents the length of the Nth expansion zone.

[0012] Preferably, the step of calculating the thermal position deviation of the target SPND detector based on the thermal temperature distribution map, the length and expansion coefficient of each expansion zone, and the required position, measurement point position, and expansion coefficient of the target SPND detector includes:

[0013] The expanded length of each expansion zone is calculated based on the thermal temperature distribution diagram and the length and expansion coefficient of each expansion zone.

[0014] Based on the thermal temperature distribution map and the required location, measurement point location, and expansion coefficient of the target SPND detector, the expanded measurement point location and the expanded required location of the target SPND detector are calculated.

[0015] The thermal position deviation of the target SPND detector is calculated based on the expanded length of each expansion zone, the expanded measurement point position of the target SPND detector, and the required expanded position.

[0016] The expression for the hot position deviation is:

[0017] Ph = H' - (L1' + L2' + ... + LN' - Lm'), where Ph represents the thermal position deviation, H' represents the expanded measurement point position of the target SPND detector, Lm' represents the expanded required position of the target SPND detector, L1' represents the expanded length of the first expanded region, L2' represents the expanded length of the second expanded region, and LN' represents the expanded length of the Nth expanded region.

[0018] Preferably, the expression for the expanded length of the expanded target is:

[0019] Lbx = Lx + Lx × Kx × (T - tx);

[0020] Lbx represents the expanded length of the target, which is the expanded region or the SPND detector. Lx represents the length of the target, Kx represents the expansion coefficient of the target, T represents the thermal temperature of the target, and tx represents the reference temperature corresponding to the expansion coefficient.

[0021] Preferably, the method for calculating the thermal temperature corresponding to the expansion target includes:

[0022] Extract the distribution map region corresponding to the expansion target from the thermal temperature distribution map; divide the distribution map region into multiple area units; calculate the average of the minimum and maximum temperatures in each area unit to obtain the average temperature of each area unit; calculate the average of the average temperatures of all area units to obtain the thermal temperature corresponding to the expansion target.

[0023] Preferably, the SPND detector measuring point position cold and hot state deviation analysis method further includes:

[0024] Obtain the theoretical and actual lengths of the measurement channels of each SPND measurement component in the measurement guide rod corresponding to the target SPND detector in both cold and hot states;

[0025] The shortest and longest measurement channel deviations of the measuring guide rod in the cold and hot states are determined based on the theoretical and actual lengths of each measurement channel in the cold and hot states, respectively.

[0026] Determine whether the shortest and longest measurement channel deviations of the measuring guide rod in both the cold and hot states are within the set deviation range;

[0027] When the shortest or longest measurement channel deviation of the measuring guide rod in the cold state is not within the set deviation range, the measurement point position of the target SPND detector is corrected for deviation before determining the cold state position deviation.

[0028] When the shortest or longest measurement channel deviation of the measuring guide rod is not within the set deviation range under hot conditions, the measurement point position of the target SPND detector is corrected for deviation before determining the hot position deviation.

[0029] Preferably, the step of determining the shortest and longest measurement channel deviations of the measuring guide rod in the cold and hot states, respectively, based on the theoretical and actual lengths of each measurement channel in the cold and hot states, includes:

[0030] For each of the measurement channels, the theoretical length and actual length in the cold state are calculated by subtracting the theoretical length from the actual length to obtain the cold state measurement channel deviation of the measurement channel.

[0031] The smallest absolute value among the cold-state measurement channel deviations of each measurement channel is set as the shortest measurement channel deviation of the measurement guide rod in the cold state, and the largest absolute value among the cold-state measurement channel deviations of each measurement channel is set as the longest measurement channel deviation of the measurement guide rod in the cold state.

[0032] For each measurement channel, the theoretical length and actual length under hot conditions are calculated by subtracting the theoretical length from the actual length to obtain the hot-state measurement channel deviation of the measurement channel.

[0033] The shortest measurement channel deviation of the measuring guide rod in the hot state is set as the smallest absolute value among the hot measurement channel deviations of each of the measuring channels, and the longest measurement channel deviation of the measuring guide rod in the hot state is set as the largest absolute value among the hot measurement channel deviations of each of the measuring channels.

[0034] Preferably, the set deviation range is ±15mm.

[0035] Preferably, N equals 2, and the steps for dividing the N expansion regions include:

[0036] The portion of the SPND measurement assembly in the pressure vessel that is fixed to the top nut and extends to the lower surface of the upper core plate of the pressure vessel is defined as the first expansion zone.

[0037] The portion from the lower surface of the upper core plate to the upper surface of the lower core plate in the pressure vessel is defined as the second expansion zone.

[0038] Preferably, the step of calculating the expanded length of each expansion zone based on the thermal temperature distribution diagram and the length and expansion coefficient of each expansion zone further includes:

[0039] The first expansion region is divided into multiple sub-expansion regions based on the temperature distribution, and the length of each sub-expansion region is determined.

[0040] The expanded length of each sub-expansion region is calculated based on the length and expansion coefficient of each sub-expansion region in the thermal temperature distribution diagram.

[0041] The sum of the expanded lengths of each of the sub-expansion regions is calculated to obtain the expanded length of the first expansion region.

[0042] Preferably, there are two sub-expansion zones, wherein the portion from the top fixing nut of the SPND measurement component in the pressure vessel to the top of the instrument column of the pressure vessel is defined as the first sub-expansion zone, and the portion from the top of the instrument column in the pressure vessel to the lower surface of the upper plate of the core is defined as the second sub-expansion zone.

[0043] Furthermore, the present invention also constructs a processing device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the steps of the above-described SPND detector measuring point position cold and hot state deviation analysis method.

[0044] In addition, the present invention also constructs a core measurement system, including the processing equipment described above.

[0045] The present invention provides the following beneficial effects: it provides a method for analyzing the cold and hot state deviation of the SPND detector measurement point position, which can accurately calculate the cold and hot state position deviation of the SPND detector, help the core measurement system correct the measurement point position of the SPND detector, effectively improve the position accuracy of the SPND detector under cold and hot conditions, avoid excessive uncertainty in the measurement of core state parameters, and play a positive role in improving the safety and reliability of nuclear power plants. Attached Figure Description

[0046] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the accompanying drawings:

[0047] Figure 1 This is a flowchart of the method for analyzing the cold and hot state deviation of the SPND detector measuring point position in some embodiments of the present invention;

[0048] Figure 2 These are schematic diagrams of the pressure vessel structure in some embodiments of the present invention;

[0049] Figure 3 This is a schematic diagram of the thermal temperature distribution in some embodiments of the present invention;

[0050] Figure 4 This is a flowchart of step S4 in some embodiments of the present invention;

[0051] Figure 5 This is a circuit structure block diagram of the processing device in some embodiments of the present invention. Detailed Implementation

[0052] To provide a clearer understanding of the technical features, objectives, and effects of the present invention, specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0053] It should be noted that the flowcharts shown in the accompanying drawings are merely illustrative and do not necessarily include all content and operations / steps, nor do they necessarily have to be performed in the described order. For example, some operations / steps can be broken down, while others can be combined or partially combined; therefore, the actual execution order may change depending on the specific circumstances.

[0054] The block diagrams shown in the accompanying drawings are merely functional entities and do not necessarily correspond to physically independent entities. That is, these functional entities can be implemented in software, in one or more hardware modules or integrated circuits, or in different network and / or processor devices and / or microcontroller devices.

[0055] Figure 1 This is a flowchart illustrating the cold and hot state deviation analysis method for the SPND detector measuring point position in some embodiments of the present invention. This analysis method can calculate the positional deviation of the SPND detector measuring point under cold and hot operating conditions, assisting personnel in correcting the SPND detector measuring point position and playing a positive role in improving the safety and reliability of nuclear power plants.

[0056] like Figure 1 As shown, the SPND detector measurement point position cold and hot state deviation analysis method may include steps S1, S2, S3 and S4.

[0057] Step S1 includes: obtaining the length and expansion coefficient of the pre-divided N expansion zones; wherein, the N expansion zones are set as multiple expansion zones with different expansion coefficients obtained by dividing the pressure vessel, and N is a natural number greater than 1.

[0058] Please see Figure 2 Since the expansion below the core lower plate 44 theoretically has no effect on the positional offset of the SPND detector, in order to simplify the calculation process of the cold and hot state positional deviation, in some embodiments, the length from the center position of the target SPND detector to the upper surface of the core lower plate 44 of the pressure vessel is used as the position coordinate of the target SPND detector, which is equivalent to Figure 2 The length of L3 in the diagram. That is, the required location or measurement point location of the target SPND detector is measured using the coordinates of this location as the standard.

[0059] Please see Figure 2Since the nuclear reaction mainly occurs between the lower core plate 44 and the upper core plate 43, the structure of this part differs from that of the part above the upper core plate 43. Therefore, different regions have different expansion coefficients. Thus, in some embodiments, N can be equal to 2. Accordingly, the division of N expansion zones may include: defining the portion from the top fixing nut 41 of the measuring guide rod 45 where the SPND measuring assembly is located in the pressure vessel to the lower surface of the upper core plate 43 of the pressure vessel as the first expansion zone A; and defining the portion from the lower surface of the upper core plate 43 to the upper surface of the lower core plate 44 of the pressure vessel as the second expansion zone B.

[0060] Step S2 includes: obtaining the thermal temperature distribution map, the required location of the target SPND detector, the location of the measuring point, and the expansion coefficient.

[0061] The hot temperature distribution map is used to represent the temperature at various locations within the pressure vessel of the reactor core under operating conditions. For details, please refer to [reference needed]. Figure 3 In addition, the hot-state temperature distribution map can be determined by using CFD 3D modeling software to generate the map based on the 3D structure of the pressure vessel, the temperature of the heat source, and the flow rate. It should be noted that drawing hot-state temperature distribution maps is a mature technology for nuclear power plants; the specific drawing process can be found in existing technologies and will not be elaborated upon here.

[0062] SPND measurement assemblies typically include multiple SPND detectors at different heights. The target SPND detector refers to any one of the SPND detectors in the SPND measurement assembly; the specific SPND detector is set by the operator based on the neutron flux detection requirements. The required position refers to the target location where the target SPND detector needs to be set, while the measurement point position refers to the current position of the target SPND detector. Both the required position and the measurement point position refer to the height of the center position of the target SPND detector relative to the upper surface of the lower core plate 44.

[0063] Step S3 includes: calculating the cold position deviation of the target SPND detector based on the length of each expansion zone and the required position and measurement point position of the target SPND detector.

[0064] Cold state typically refers to the reactor shutdown state, where the temperature is low and the effect of thermal expansion can be ignored. Therefore, the room temperature dimensions of the pressure vessel and SPND detector can be considered as the dimensions under cold state conditions. Accordingly, in some embodiments, the cold state position deviation can be calculated using a first set expression. The first set expression can be expressed as: Pc = H - (L1 + L2 + ... + LN - Lm), where Pc represents the cold state position deviation, H represents the measurement point position of the target SPND detector, Lm represents the required position of the target SPND detector, L1 represents the length of the first expansion zone, L2 represents the length of the second expansion zone, and LN represents the length of the Nth expansion zone.

[0065] Step S4 includes: calculating the thermal position deviation of the target SPND detector based on the thermal temperature distribution map, the length and expansion coefficient of each expansion zone, and the required position, measurement point position and expansion coefficient of the target SPND detector.

[0066] In some embodiments, it can be achieved by executing Figure 4 Steps S41 to S43 shown calculate the thermal position deviation of the target SPND detector.

[0067] Step S41 includes: calculating the expanded length of each expansion zone based on the thermal temperature distribution diagram and the length and expansion coefficient of each expansion zone.

[0068] Step S42 includes: calculating the expanded measurement point position and the expanded required position of the target SPND detector based on the thermal temperature distribution map, the required position of the target SPND detector, the measurement point position, and the expansion coefficient.

[0069] In some embodiments, the expanded length of each expansion zone, the expanded measurement point position of the target SPND detector, and the required expanded position can be calculated using a second setting expression. The second setting expression can be expressed as: Lbx = Lx + Lx × Kx × (T - tx).

[0070] Lbx represents the expanded length of the target, which is either the expanded region or the SPND detector. The second setting expression is applicable to the calculation of the expanded length of each expanded region, the expanded measurement point position of the target SPND detector, and the required expanded position.

[0071] Lx represents the length of the expanding target. When the expanding target is an expanding region, the length of the expanding target corresponds to the length of the expanding region (i.e., the length at room temperature). When the expanding target is a target SPND detector, the length of the expanding target corresponds to the measurement point position or required position of the target SPND detector. When the length of the expanding target is the length of the expanding region, the length of the expanding target corresponds to the expanded length of the expanding region; when the length of the expanding target is the measurement point position of the target SPND detector, the length of the expanding target corresponds to the expanded measurement point position of the target SPND detector; when the length of the expanding target is the required position of the target SPND detector, the length of the expanding target corresponds to the expanded required position of the target SPND detector.

[0072] Kx represents the expansion coefficient of the expanding target. Since the materials used to manufacture the pressure vessel and SPND detector are known, the expansion coefficients of each expansion zone and the SPND detector are also temperature-dependent; please refer to [link to relevant documentation]. Figure 2The pressure vessel's main body is made of austenitic stainless steel. The first expansion zone A, outside the austenitic stainless steel shell, also houses necessary components, resulting in different expansion coefficients for the first and second expansion zones B. The second expansion zone B is primarily surrounded by the austenitic stainless steel shell; therefore, its expansion coefficient can be determined by consulting a list of thermal expansion coefficients for austenitic stainless steel. For example, in some embodiments, the temperature in a nuclear power plant's hot-state temperature distribution map is 350°C, while the expansion coefficient of austenitic stainless steel at a reference temperature of 20°C is 17.9. The thermal expansion coefficients of the first expansion zone A and the SPND detector can be determined using existing thermal expansion coefficient measurement methods or devices, which are not limited here.

[0073] T represents the thermal temperature corresponding to the expansion target. Please refer to [link / reference]. Figure 3 The thermal temperature distribution map contains temperature information at different locations within the pressure vessel. When the expansion target is the first expansion zone, the average thermal temperature of the first expansion zone can be determined as the thermal temperature of the first expansion zone. When the expansion target is the second expansion zone, the average thermal temperature of the second expansion zone can be determined as the thermal temperature of the second expansion zone. Since the SPND detector is located within the second expansion zone, the average thermal temperature of the second expansion zone can be determined as the thermal temperature of the SPND detector.

[0074] Furthermore, in some embodiments, the hot-state temperature of the expansion target can be calculated as follows: extract the distribution map region corresponding to the expansion target from the hot-state temperature distribution map; divide the distribution map region into multiple area units; calculate the average of the minimum and maximum temperatures in each area unit to obtain the average temperature of each area unit; calculate the average of the average temperatures of all area units to obtain the hot-state temperature corresponding to the expansion target. Specifically, taking the second expansion zone as an example, in the hot-state temperature distribution map, the distribution map of the portion from the lower surface of the upper core plate 43 to the upper surface of the lower core plate 44 in the pressure vessel can be extracted to obtain the distribution map region corresponding to the second expansion zone. The smaller the area of ​​the area unit, the higher the accuracy of the hot-state temperature calculation, but the greater the computational load. Therefore, operators can customize the area unit according to their needs using the human-computer interaction module. The area unit can be rectangular. tx represents the reference temperature corresponding to the expansion coefficient of the expansion target. The reference temperature can be 20℃.

[0075] Step S43 includes: calculating the thermal position deviation of the target SPND detector based on the expanded length of each expansion zone, the expanded measurement point position of the target SPND detector, and the required expanded position.

[0076] In some embodiments, the thermal position deviation can be calculated using a third setting expression. The third setting expression can be: Ph = H' - (L1' + L2' + ... + LN' - Lm'), where Ph represents the thermal position deviation, H' represents the expanded measurement point position of the target SPND detector, Lm' represents the expanded required position of the target SPND detector, L1' represents the expanded length of the first expansion zone, L2' represents the expanded length of the second expansion zone, and LN' represents the expanded length of the Nth expansion zone.

[0077] Please see Figure 3 In the first expansion zone A, there are temperature differences between different regions. Since temperature is one of the important influencing factors of expansion, in order to improve the accuracy of the calculation of the thermal position deviation, in some embodiments, step S41 may further include: dividing the first expansion zone A into multiple sub-expansion zones based on the temperature distribution and determining the length of each sub-expansion zone; calculating the expanded length of each sub-expansion zone according to the length of each sub-expansion zone and the expansion coefficient in the thermal temperature distribution map; and calculating the sum of the expanded lengths of each sub-expansion zone to obtain the expanded length of the first expansion zone A.

[0078] Specifically, the temperature decreases with increasing distance from the core temperature. The top 42 of the instrument column in the pressure vessel is equipped with a baffle plate, which provides some insulation. Figure 3 As shown, there can be two sub-expansion zones. The first sub-expansion zone A1 can be the part from the top fixing nut 41 of the measuring guide rod 45 where the SPND measuring component is located in the pressure vessel to the top of the instrument column 42 of the pressure vessel. The second sub-expansion zone A2 can be the part from the top of the instrument column 42 of the pressure vessel to the lower surface of the core upper plate 43.

[0079] Furthermore, the second predefined expression is also applicable to calculating the expanded length of the sub-expansion region, using the length of the sub-expansion region as the length of the expansion target, and the expansion coefficient of the sub-expansion region as the expansion coefficient of the expansion target. The method for calculating the hot temperature of the expansion target is also applicable to the sub-expansion region.

[0080] It should be noted that the cold-state position deviation and the hot-state position deviation can be applied in the core calculation software of the core measurement system to correct the measurement point position of the SPND detector.

[0081] It should be noted that pressure vessels are equipped with, for example Figure 2The diagram shows multiple measuring guide rods 45, each of which can simultaneously connect to multiple sets of SPND measuring components 47 (typically 3 to 4 sets). The measuring guide rods 45 are connected one-to-one to each SPND measuring component 47 via multiple measuring channels 46. Due to engineering errors in the manufacturing of pressure vessels according to design drawings, the actual length of each measuring channel 46 may differ from the design length. Furthermore, each measuring channel 46 will experience thermal expansion, potentially leading to significant deviations in the position of the SPND detector. To address these shortcomings, in some embodiments, the SPND detector measuring point position cold-hot state deviation analysis method may further include steps S51 to S53.

[0082] Step S51 includes: obtaining the theoretical and actual lengths of the measurement channels 46 of each SPND measurement component 47 in the measurement guide rod 45 corresponding to the target SPND detector in both cold and hot states. Specifically, the theoretical length of each measurement channel 46 in the cold state can be obtained from the design drawings, and then the theoretical length of each measurement channel 46 in the hot state can be calculated based on the expansion coefficient of the measurement channel 46 and the theoretical length in the cold state (refer to the method described above). The actual length of the measurement channel 46 in the cold state is the actual length of the measurement channel 46 during the manufacturing of the pressure vessel, while the actual length in the hot state can be calculated based on the expansion coefficient of the measurement channel 46 and the theoretical length in the hot state.

[0083] To improve efficiency, in some embodiments, the theoretical and actual lengths of all measurement channels 46 in the pressure vessel in both cold and hot states can be pre-stored in memory for quick retrieval when needed.

[0084] Step S52 includes: determining the shortest and longest measurement channel deviations of the measuring guide rod 45 in the cold and hot states, respectively, based on the theoretical and actual lengths of each measuring channel 46 in the cold and hot states.

[0085] In some embodiments, the shortest and longest measurement channel deviations of the measuring guide rod 45 in cold and hot states can be determined by performing the following steps: For each measuring channel 46 in the cold state, both the theoretical and actual lengths are calculated as follows: the difference between the theoretical and actual lengths is used to obtain the cold-state measurement channel deviation of the measuring channel 46; the smallest absolute value among the cold-state measurement channel deviations of each measuring channel 46 is set as the shortest measurement channel deviation of the measuring guide rod 45 in the cold state, and the largest absolute value among the cold-state measurement channel deviations of each measuring channel 46 is set as the longest measurement channel deviation of the measuring guide rod 45 in the cold state; For each measuring channel 46 in the hot state, both the theoretical and actual lengths are calculated as follows: the difference between the theoretical and actual lengths is used to obtain the hot-state measurement channel deviation of the measuring channel 46; the smallest absolute value among the hot-state measurement channel deviations of each measuring channel 46 is set as the shortest measurement channel deviation of the measuring guide rod 45 in the hot state, and the largest absolute value among the hot-state measurement channel deviations of each measuring channel 46 is set as the longest measurement channel deviation of the measuring guide rod 45 in the hot state.

[0086] Step S53 includes: determining whether the shortest measurement channel deviation and the longest measurement channel deviation of the measuring guide rod 45 in the cold and hot states are both within the set deviation range.

[0087] Step S54 includes: when the shortest or longest measurement channel deviation of the measuring guide rod 45 in the cold state is not within the set deviation range, the measurement point position of the target SPND detector is corrected for deviation before determining the cold state position deviation. When both the shortest and longest measurement channel deviations of the measuring guide rod 45 in the cold state are within the set deviation range, it is not necessary to correct the measurement point position of the target SPND detector for deviation before determining the cold state position deviation.

[0088] Step S55 includes: when the shortest or longest measurement channel deviation of the measuring guide rod 45 under hot conditions is not within the set deviation range, the measurement point position of the target SPND detector is corrected for deviation before determining the hot position deviation. When both the shortest and longest measurement channel deviations of the measuring guide rod 45 under hot conditions are within the set deviation range, it is not necessary to correct the measurement point position of the target SPND detector before determining the hot position deviation.

[0089] In some embodiments, the deviation of the measurement point position of the target SPND detector can be corrected by: measuring the actual position coordinates of the connection between the target SPND detector and the measurement channel 46 in a cold or hot state, and correcting the deviation of the measurement point position of the target SPND detector in the corresponding state based on the actual position coordinates of the corresponding state; or correcting the deviation of the measurement channel of the target SPND detector in the corresponding state based on the cold or hot state of the target SPND detector. Specific methods for position deviation correction can be found in existing technologies and will not be elaborated here.

[0090] In some embodiments, the deviation range is set to ±15mm.

[0091] The present invention also provides a computer storage medium storing a computer program, which, when executed, implements the steps of the SPND detector measuring point position cold and hot state deviation analysis method provided in the embodiments of the present invention.

[0092] like Figure 5 As shown, the present invention also provides a processing device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the steps of the SPND detector measuring point position cold and hot state deviation analysis method provided in the embodiments of the present invention.

[0093] In addition, the present invention also provides a core measurement system, including the processing equipment provided in the embodiments of the present invention.

[0094] Understandably, the technical solution of the present invention can accurately calculate the cold and hot position deviations of the SPND detector, helping the core measurement system to correct the measurement point position of the SPND detector, effectively improving the position accuracy of the SPND detector under cold and hot conditions, avoiding excessive uncertainty in the measurement of core state parameters, and playing a positive role in improving the safety and reliability of nuclear power plants.

[0095] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to in the method section.

[0096] Those skilled in the art will further recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of both. To clearly illustrate the interchangeability of hardware and software, the components and steps of the various examples have been generally described in terms of functionality in the foregoing description. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementations should not be considered beyond the scope of this invention.

[0097] The steps of the methods or algorithms described in conjunction with the embodiments disclosed herein can be implemented directly by hardware, a software module executed by a processor, or a combination of both. The software module can be located in random access memory (RAM), main memory, read-only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, removable disk, CD-ROM, or any other form of storage medium known in the art.

[0098] It is understood that the above embodiments only illustrate preferred embodiments of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can freely combine the above technical features without departing from the concept of the present invention, and can also make several modifications and improvements, all of which fall within the protection scope of the present invention. Therefore, all equivalent transformations and modifications made with respect to the scope of the claims of the present invention should fall within the scope of the claims of the present invention.

Claims

1. A method for analyzing cold and hot state deviations of a SPND probe measurement point position, characterized in that, include: Obtain the length and expansion coefficient of the pre-divided N expansion zones; wherein, the N expansion zones are set as multiple expansion zones with different expansion coefficients obtained by dividing the pressure vessel, and N is a natural number greater than 1; Obtain the thermal temperature distribution map, the required location of the target SPND detector, the location of the measuring point, and the coefficient of thermal expansion; The cold position deviation of the target SPND detector is calculated based on the length of each expansion zone and the required position and measurement point position of the target SPND detector. The thermal position deviation of the target SPND detector is calculated based on the thermal temperature distribution map, the length and expansion coefficient of each expansion zone, and the required position, measurement point position and expansion coefficient of the target SPND detector. The length from the center position of the target SPND detector to the upper surface of the lower core plate of the pressure vessel is used as the position coordinate; In the step of calculating the cold-state position deviation of the target SPND detector based on the length of each expansion zone and the required position and measurement point position of the target SPND detector, the expression for the cold-state position deviation is: Pc=H-(L1+L2+…+LN-Lm), where Pc represents the cold-state position deviation, H represents the measurement point position of the target SPND detector, Lm represents the required position of the target SPND detector, L1 represents the length of the first expansion zone, L2 represents the length of the second expansion zone, and LN represents the length of the Nth expansion zone; The step of calculating the thermal position deviation of the target SPND detector based on the thermal temperature distribution map, the length and expansion coefficient of each expansion zone, and the required position, measurement point position, and expansion coefficient of the target SPND detector includes: calculating the expanded length of each expansion zone based on the thermal temperature distribution map and the length and expansion coefficient of each expansion zone; calculating the expanded measurement point position and the expanded required position of the target SPND detector based on the thermal temperature distribution map and the required position, measurement point position, and expansion coefficient of the target SPND detector; and calculating the thermal position deviation of the target SPND detector based on the expanded length of each expansion zone, the expanded measurement point position, and the expanded required position of the target SPND detector. The expression for the hot position deviation is: Ph = H' - (L1' + L2' + ... + LN' - Lm'), where Ph represents the thermal position deviation, H' represents the expanded measurement point position of the target SPND detector, Lm' represents the expanded required position of the target SPND detector, L1' represents the expanded length of the first expanded region, L2' represents the expanded length of the second expanded region, and LN' represents the expanded length of the Nth expanded region.

2. The SPND probe site position cold-hot bias analysis method of claim 1, wherein, The expression for the expanded length of the expanded target is: Lbx= Lx +Lx×Kx×(T-tx); Lbx represents the expanded length of the target, which is the expanded region or the SPND detector. Lx represents the length of the target, Kx represents the expansion coefficient of the target, T represents the thermal temperature of the target, and tx represents the reference temperature corresponding to the expansion coefficient.

3. The SPND probe site position cold-hot bias analysis method of claim 2, wherein, The method for calculating the thermal temperature corresponding to the expansion target includes: Extract the distribution map region corresponding to the expansion target from the thermal temperature distribution map; divide the distribution map region into multiple area units; calculate the average of the minimum and maximum temperatures in each area unit to obtain the average temperature of each area unit; calculate the average of the average temperatures of all area units to obtain the thermal temperature corresponding to the expansion target.

4. The method for analyzing the cold and hot state deviation of the SPND detector measuring point position according to claim 1, characterized in that, Also includes: Obtain the theoretical and actual lengths of the measurement channels of each SPND measurement component in the measurement guide rod corresponding to the target SPND detector in both cold and hot states; Based on the theoretical and actual lengths of each measurement channel in cold and hot states, determine the shortest and longest measurement channel deviations of the measurement guide rod in cold and hot states, respectively; Determine whether the shortest and longest measurement channel deviations of the measuring guide rod in both the cold and hot states are within the set deviation range; When the shortest or longest measurement channel deviation of the measuring guide rod in the cold state is not within the set deviation range, the measurement point position of the target SPND detector is corrected for deviation before determining the cold state position deviation. When the shortest or longest measurement channel deviation of the measuring guide rod is not within the set deviation range under hot conditions, the measurement point position of the target SPND detector is corrected for deviation before determining the hot position deviation.

5. The method for analyzing the cold and hot state deviation of the SPND detector measuring point position according to claim 4, characterized in that, The step of determining the shortest and longest measurement channel deviations of the measuring guide rod in cold and hot states, respectively, based on the theoretical and actual lengths of each measurement channel in cold and hot states, includes: For each of the measurement channels, the theoretical length and actual length in the cold state are calculated by subtracting the theoretical length from the actual length to obtain the cold state measurement channel deviation of the measurement channel. The smallest absolute value among the cold-state measurement channel deviations of each measurement channel is set as the shortest measurement channel deviation of the measurement guide rod in the cold state, and the largest absolute value among the cold-state measurement channel deviations of each measurement channel is set as the longest measurement channel deviation of the measurement guide rod in the cold state. For each measurement channel, the theoretical length and actual length under hot conditions are calculated by subtracting the theoretical length from the actual length to obtain the hot-state measurement channel deviation of the measurement channel. The shortest measurement channel deviation of the measuring guide rod in the hot state is set as the smallest absolute value among the hot measurement channel deviations of each of the measuring channels, and the longest measurement channel deviation of the measuring guide rod in the hot state is set as the largest absolute value among the hot measurement channel deviations of each of the measuring channels.

6. The method for analyzing the cold and hot state deviation of the SPND detector measuring point position according to claim 5, characterized in that, The set deviation range is ±15mm.

7. The method for analyzing the cold and hot state deviation of the SPND detector measuring point position according to any one of claims 1 to 6, characterized in that, When N equals 2, the steps for dividing the N expansion regions include: The portion of the SPND measurement assembly in the pressure vessel that is fixed to the top nut and extends to the lower surface of the upper core plate of the pressure vessel is defined as the first expansion zone. The portion from the lower surface of the upper core plate to the upper surface of the lower core plate in the pressure vessel is defined as the second expansion zone.

8. The method for analyzing the cold and hot state deviation of the SPND detector measuring point position according to claim 7, characterized in that, The step of calculating the expanded length of each expansion zone based on the thermal temperature distribution diagram and the length and expansion coefficient of each expansion zone further includes: The first expansion region is divided into multiple sub-expansion regions based on the temperature distribution, and the length of each sub-expansion region is determined. The expanded length of each sub-expansion region is calculated based on the length and expansion coefficient of each sub-expansion region in the thermal temperature distribution diagram. The sum of the expanded lengths of each of the sub-expansion regions is calculated to obtain the expanded length of the first expansion region.

9. The method for analyzing the cold and hot state deviation of the SPND detector measuring point position according to claim 8, characterized in that, The number of sub-expansion zones is two. The portion from the top fixing nut of the SPND measurement component in the pressure vessel to the top of the instrument column of the pressure vessel is defined as the first sub-expansion zone, and the portion from the top of the instrument column in the pressure vessel to the lower surface of the upper plate of the core is defined as the second sub-expansion zone.

10. A processing apparatus comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the steps of the SPND detector measuring point position cold and hot state deviation analysis method according to any one of claims 1 to 9.

11. A reactor core measurement system, characterized in that, Includes the processing apparatus as described in claim 10.

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