Fuel assembly linear power density measurement method and apparatus, computer device and medium

Abstract

The present application relates to a fuel assembly linear power density measurement method and apparatus, a computer device and a medium. The method comprises: when a target fuel assembly in a reactor core is not provided with an in-reactor detection device at a target height position, detecting whether in-reactor detection devices provided at target height positions of a preset number of candidate fuel assemblies that are adjacent to the target fuel assembly in the reactor core are damaged; if the in-reactor detection devices arranged at the target height positions of the candidate fuel assemblies are all damaged, acquiring measured linear power densities corresponding to other positions except the target height position of the target fuel assembly; and, on the basis of each measured linear power density, determining the target linear power density at the target height position of the target fuel assembly. Using the method can acquire the linear power density of the target fuel assembly which is not provided with a reactor core detection device, thus improving the accuracy of acquiring the linear power density of the target fuel assembly.

Description

Fuel assembly linear power density measurement method, device, computer equipment and medium

[0001] This application claims priority to Chinese patent application number CN202311627027.9, filed on November 29, 2023, entitled “Method, device, computer equipment and medium for measuring linear power density of fuel assemblies,” the entire text of which is hereby incorporated by reference. Technical Field

[0002] The present application relates to the field of nuclear power technology, and in particular to a method, device, computer equipment and medium for measuring the linear power density of a fuel assembly. Background Art

[0003] With the development of computer equipment and detection technology, people can use in-pile detection equipment (such as self-powered neutron detectors, SPND) to collect the linear power density at each axial height in each fuel assembly and complete the three-dimensional power reconstruction of the reactor core.

[0004] In the prior art, in-pile detection equipment is installed on some fuel assemblies, and the linear power density of the fuel assembly is directly obtained through the in-pile detection equipment. For fuel assemblies without in-pile detection equipment, the linear power density of the fuel assembly without in-pile detection equipment can be obtained through weighted calculation based on the linear power densities of a preset number of fuel assemblies with in-pile detection equipment around it.

[0005] Although this method can determine the linear power density of a fuel assembly without in-pile detection equipment, when the in-pile detection equipment of a preset number of fuel assemblies with in-pile detection equipment around it are damaged, the weighted calculation cannot continue, and the linear power density of the fuel assembly without in-pile detection equipment cannot be accurately obtained.

[0006] Summary of the Invention

[0007] Based on this, it is necessary to provide a fuel assembly linear power density measurement method, device, computer equipment and medium that can accurately obtain the linear power density of fuel rods without detection equipment to address the above technical problems.

[0008] In a first aspect, the present application provides a method for measuring the linear power density of a fuel assembly, comprising:

[0009] If no in-pile detection device is installed at a target height position of a target fuel assembly in the reactor core, detecting whether in-pile detection devices installed at target height positions in a preset number of candidate fuel assemblies adjacent to the target fuel assembly in the reactor core are damaged; the candidate fuel assemblies are installed with in-pile detection devices;

[0010] If the in-pile detection devices installed at the target height position of each candidate fuel assembly are all damaged, then obtain the measurement line power density corresponding to other positions of the target fuel assembly except the target height position, and the in-pile detection devices installed at the other positions of each candidate fuel assembly are not damaged;

[0011] The target linear power density at the target height position in the target fuel assembly is determined based on the measured linear power densities.

[0012] In one embodiment, determining a target linear power density at a target height position in a target fuel assembly based on each measured linear power density includes:

[0013] Performing polynomial interpolation processing on each measured linear power density to determine the median linear power density at the target height position in the target fuel assembly;

[0014] The target line power density is determined based on the positive or negative value of the intermediate line power density.

[0015] In one embodiment, determining the target line power density based on the positive or negative condition of the intermediate line power density includes:

[0016] If the intermediate linear power density is negative, the target linear power density is determined based on the target height position in the target fuel assembly;

[0017] If the middle line power density is non-negative, the middle line power density is used as the target line power density.

[0018] In one embodiment, determining a target linear power density based on a target height position in a target fuel assembly includes:

[0019] If the target height position is the fore-aft height position, the measured linear power density corresponding to the position adjacent to the target height position in the target fuel assembly is used as the target linear power density;

[0020] If the target height position is an intermediate height position, linear interpolation processing is performed on the measured linear power densities corresponding to two adjacent positions of the target height position in the target fuel assembly to obtain the target linear power density.

[0021] In one embodiment, the method further comprises:

[0022] If at least one in-pile detection device is not damaged at the target height position in each candidate fuel assembly, obtaining the measured linear power density at the target height position in each candidate fuel assembly;

[0023] The target linear power density is determined based on the measured linear power density at the target height position in each candidate fuel assembly, the measurement weight corresponding to each candidate fuel assembly, and the signal status of the in-pile detection equipment set at the target height position in each candidate fuel assembly.

[0024] In one embodiment, the method further comprises:

[0025] determining the distance between the target fuel assembly and the candidate fuel assembly;

[0026] The measurement weight corresponding to the candidate fuel assembly is determined based on the preset weight corresponding to the distance interval to which the distance belongs.

[0027] In a second aspect, the present application further provides a fuel assembly linear power density measurement device, comprising:

[0028] a damage detection module, configured to detect whether the in-core detection devices installed at the target height positions of a preset number of candidate fuel assemblies adjacent to the target fuel assembly in the reactor core are damaged, if no in-core detection device is installed at the target height position of the target fuel assembly in the reactor core;

[0029] a density acquisition module configured to acquire the measurement line power density corresponding to positions other than the target height position in the target fuel assembly if the in-pile detection devices installed at the target height position in each candidate fuel assembly are all damaged, and the in-pile detection devices installed in each candidate fuel assembly at the other positions are not damaged;

[0030] The density determination module is used to determine the target linear power density at the target height position in the target fuel assembly based on the measured linear power densities.

[0031] In a third aspect, the present application further provides a computer device comprising a memory and a processor, wherein the memory stores a computer program, and when the processor executes the computer program, the following steps are implemented:

[0032] If no in-core detection device is installed at the target height position of the target fuel assembly in the reactor core, detecting whether the in-core detection devices installed at the target height positions in a preset number of candidate fuel assemblies adjacent to the target fuel assembly in the reactor core are damaged;

[0033] If the in-pile detection devices installed at the target height position of each candidate fuel assembly are all damaged, then obtain the measurement line power density corresponding to other positions of the target fuel assembly except the target height position, and the in-pile detection devices installed at the other positions of each candidate fuel assembly are not damaged;

[0034] The target linear power density at the target height position in the target fuel assembly is determined based on the measured linear power densities.

[0035] In a fourth aspect, the present application further provides a computer-readable storage medium having a computer program stored thereon, wherein when the computer program is executed by a processor, the following steps are implemented:

[0036] If no in-core detection device is installed at the target height position of the target fuel assembly in the reactor core, detecting whether the in-core detection devices installed at the target height positions in a preset number of candidate fuel assemblies adjacent to the target fuel assembly in the reactor core are damaged;

[0037] If the in-pile detection devices installed at the target height position of each candidate fuel assembly are all damaged, then obtain the measurement line power density corresponding to other positions of the target fuel assembly except the target height position, and the in-pile detection devices installed at the other positions of each candidate fuel assembly are not damaged;

[0038] The target linear power density at the target height position in the target fuel assembly is determined based on the measured linear power densities.

[0039] In a fifth aspect, the present application further provides a computer program product, comprising a computer program, which, when executed by a processor, implements the following steps:

[0040] If no in-core detection device is installed at the target height position of the target fuel assembly in the reactor core, detecting whether the in-core detection devices installed at the target height positions in a preset number of candidate fuel assemblies adjacent to the target fuel assembly in the reactor core are damaged;

[0041] If the in-pile detection devices installed at the target height position of each candidate fuel assembly are all damaged, then obtain the measurement line power density corresponding to other positions of the target fuel assembly except the target height position, and the in-pile detection devices installed at the other positions of each candidate fuel assembly are not damaged;

[0042] The target linear power density at the target height position in the target fuel assembly is determined based on the measured linear power densities.

[0043] The above-mentioned fuel assembly linear power density measurement method, device, computer equipment and medium, when no in-pile detection equipment is installed at the target height position of the target fuel assembly in the core, detects whether the in-pile detection equipment installed at the target height position of a preset number of candidate fuel assemblies adjacent to the target fuel assembly in the core is damaged; if the in-pile detection equipment installed at the target height position of each candidate fuel assembly is damaged, then obtains the measured linear power densities corresponding to other positions of the target fuel assembly except the target height position, and the in-pile detection equipment installed in each candidate fuel assembly at other positions is not damaged; and determines the target linear power density at the target height position of the target fuel assembly based on each measured linear power density. This method determines the target linear power density of the target fuel assembly by measuring the linear power densities corresponding to other positions of the target fuel assembly except the target height position, thereby avoiding the problem of being unable to accurately obtain the linear power density of the target fuel assembly without the in-pile detection equipment when the in-pile detection equipment is not installed at the target height position of the target fuel assembly in the core, and further improves the accuracy of obtaining the linear power density of the target fuel assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] FIG1 is a diagram showing an application environment of a method for measuring linear power density of a fuel assembly provided by this embodiment;

[0045] FIG2 is a schematic flow chart of a first method for measuring linear power density of a fuel assembly provided in this embodiment;

[0046] FIG3 is a schematic structural diagram of a core and fuel assembly provided in this embodiment;

[0047] FIG4 is a schematic diagram of a process for determining a target linear power density according to this embodiment;

[0048] FIG5 is a schematic flow chart of a second method for measuring linear power density of a fuel assembly provided in this embodiment;

[0049] FIG6 is a structural block diagram of a first fuel assembly linear power density measurement device provided in this embodiment;

[0050] FIG7 is a structural block diagram of a second fuel assembly linear power density measurement device provided in this embodiment;

[0051] FIG8 is a structural block diagram of a third fuel assembly linear power density measurement device provided in this embodiment;

[0052] FIG9 is a diagram showing the internal structure of a computer device provided in this embodiment. DETAILED DESCRIPTION

[0053] In order to make the purpose, technical solutions and advantages of this application more clear, the following further describes this application in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0054] The fuel assembly linear power density measurement method provided in an embodiment of the present application can be applied in the application environment shown in Figure 1. In particular, the in-pile detection device 102 communicates with the server 104 via a network. A data storage system can store data that the server 104 needs to process. The data storage system can be integrated on the server 104, or placed on a cloud or other network server. In the event that the in-pile detection device 102 is not installed at the target height position of the target fuel assembly in the core, the in-pile detection devices 102 installed at the target height position in a preset number of candidate fuel assemblies adjacent to the target fuel assembly in the fuel assembly core are detected to determine whether they are damaged; if the in-pile detection devices 102 installed at the target height position in each candidate fuel assembly are damaged, the measured linear power densities corresponding to other positions in the target fuel assembly other than the target height position are obtained, and the in-pile detection devices 102 installed in each candidate fuel assembly at other positions are not damaged; based on each measured linear power density, the target linear power density at the target height position in the target fuel assembly is determined. In particular, the server 104 can be implemented as an independent server or a server cluster consisting of multiple servers.

[0055] In an exemplary embodiment, as shown in FIG2 , a method for measuring the linear power density of a fuel assembly is provided. The method is described by taking the server 104 in FIG1 as an example, and includes the following steps S201 to S203 . In particular:

[0056] S201: When no in-core detection equipment is installed at the target height position of the target fuel assembly in the core, detect whether the in-core detection equipment installed at the target height position in a preset number of candidate fuel assemblies adjacent to the target fuel assembly in the core is damaged.

[0057] The core may be an assembly in a reactor consisting of at least one fuel assembly. The target height position may be any position in the fuel assembly corresponding to an axial height at which an in-core detection device is installed. The in-core detection device may be a device for detecting the linear power density at each axial height of the fuel assembly, such as a self-powered neutron detector (SPND). The fuel assembly may be an assembly for detecting linear power density. The fuel assembly is generally vertically arranged in the core and may have multiple axial heights, each of which may be equipped with an in-core detection device. It should be noted that a fuel assembly equipped with an in-core detection device is equipped with an in-core detection device at each axial height. If an in-core detection device is not present in a fuel assembly, it indicates that the fuel assembly is not equipped with an in-core detection device at each axial height. Therefore, a fuel assembly does not have only a portion of the in-core detection devices installed. The target fuel assembly may be the fuel assembly whose linear power density is to be measured. The candidate fuel assembly may be a fuel assembly adjacent to the target fuel assembly within a preset distance and equipped with an in-core detection device. The linear power density may be the density of the fuel assembly's output power as detected by the in-core detection device.

[0058] Optionally, when no in-pile detection equipment is installed at the target height position of the target fuel assembly in the core, the server can select a preset number of fuel assemblies adjacent to the target fuel assembly, and determine the setting of each in-pile detection equipment in each fuel assembly, select the fuel assembly with the in-pile detection equipment as the candidate fuel assembly, and further determine whether the in-pile detection equipment installed at the target height position of the candidate fuel assembly is damaged.

[0059] For example, as shown in Figure 3, the core and fuel assembly structure is schematically illustrated. The left figure shows the core structure, with each square representing a fuel assembly. In-core detection devices (i.e., SPNDs) are installed at each axial height in fuel assemblies A, B, C, and D. The right figure shows the structure of fuel assembly X in the core. Fuel assembly X is provided with five axial heights, namely, axial heights Z1-Z5, and no in-core detection devices are installed at any of these axial heights. Taking the detection of the target linear power density at axial height Z3 in fuel assembly X as an example, since no in-core detection device is installed at target height Z3 of target fuel assembly X in the core, the in-core detection devices installed at target height Z3 in a predetermined number of candidate fuel assemblies A, B, C, and D adjacent to target fuel assembly X in the core are inspected for damage.

[0060] S202: If the in-pile detection devices provided at the target height position in each candidate fuel assembly are all damaged, then the measured linear power densities corresponding to positions other than the target height position in the target fuel assembly are obtained.

[0061] Among them, the in-pile detection equipment installed in the candidate fuel assemblies at other locations was not damaged.

[0062] Optionally, if the in-pile detection equipment installed at the target height position of each candidate fuel assembly is damaged, the server can determine other axial heights (i.e., other positions) in the target fuel assembly except the target height position, and further obtain the measured line power density corresponding to all other positions.

[0063] For example, as shown in FIG3 , taking the detection of the target linear power density at the axial height Z3 in the fuel assembly X as an example, if the in-pile detection devices set at the target height position Z3 in each candidate fuel assembly are damaged, the measured linear power densities corresponding to the other positions (i.e., axial height Z1, axial height Z2, axial height Z4, and axial height Z5) in the target fuel assembly X except the target height position Z3 are obtained.

[0064] S203 determines the target linear power density at the target height position in the target fuel assembly based on the measured linear power densities.

[0065] The target linear power density may be a linear power density determined by measuring the linear power densities corresponding to all other positions in the target fuel assembly.

[0066] Optionally, the measured linear power densities corresponding to all other positions in the target fuel assembly are obtained, polynomial interpolation calculation processing is performed on each measured linear power density, and the linear power density obtained by the polynomial interpolation calculation processing is used as the target linear power density of the target fuel assembly.

[0067] The above-mentioned fuel assembly linear power density measurement method, when no in-pile detection equipment is installed at the target height position of the target fuel assembly in the core, detects whether the in-pile detection equipment installed at the target height position in a preset number of candidate fuel assemblies adjacent to the target fuel assembly in the core is damaged; if the in-pile detection equipment installed at the target height position in each candidate fuel assembly is damaged, obtains the measured linear power densities corresponding to other positions in the target fuel assembly except the target height position, and the in-pile detection equipment installed in each candidate fuel assembly at other positions is not damaged; and determines the target linear power density at the target height position in the target fuel assembly based on each measured linear power density. This method determines the target linear power density of the target fuel assembly by measuring the linear power densities corresponding to other positions in the target fuel assembly except the target height position, thereby avoiding the problem of being unable to accurately obtain the linear power density of the target fuel assembly without the in-pile detection equipment when the in-pile detection equipment is not installed at the target height position of the target fuel assembly in the core, and further improves the accuracy of obtaining the linear power density of the target fuel assembly.

[0068] It should be noted that when in-core detection devices are installed at each axial height of the target fuel assembly in the core, the server can directly obtain the target linear power density at each axial height of the target fuel assembly through the in-core detection devices installed at each axial height; however, for target fuel assemblies that are not equipped with in-core detection devices at each axial height, there may be a situation where the in-core detection devices installed in some candidate fuel rods adjacent to the target fuel assembly at a certain axial height are damaged. In this case, the present implementation may further include: if at least one in-core detection device at the target height position in each candidate fuel assembly is not damaged, obtaining the measured linear power density at the target height position in each candidate fuel assembly; determining the target linear power density based on the measured linear power density at the target height position in each candidate fuel assembly, the measurement weight corresponding to each candidate fuel assembly, and the signal status of the in-core detection devices installed at the target height position in each candidate fuel assembly. The signal status can be used to represent the operating status of the in-core detection device. For example, when the signal status value is 1, it indicates that the in-core detection device is operating normally, and when the signal status value is 0, it indicates that the in-core detection device has stopped operating. Optionally, if at least one in-pile detection device is intact at the target height position in each candidate fuel assembly, the server obtains the measured linear power density at the target height position for each candidate fuel assembly with an intact in-pile detection device through the in-pile detection device installed at the target height position in each candidate fuel assembly. Based on the measured linear power density of each candidate fuel assembly, the measurement weight corresponding to each candidate fuel assembly, and the signal state of the in-pile detection device installed at the target height position for each candidate fuel assembly, the server determines the target linear power density using the following formula (1-1). This method can accurately determine the target linear power density at the target height position for the target fuel assembly equipped with the in-pile detection device.

[0069] Among them, P_(a,z_i) is the target linear power density of target fuel assembly a at position zi, P_(a_k,z_i) is the measured linear power density of candidate fuel assembly ak at position zi, ω_(a_k) is the measurement weight corresponding to candidate fuel assembly ak, s_(a_k,z_i) is the signal status of the detection equipment set at position zi for candidate fuel assembly ak, and m is the preset number of candidate fuel assemblies.

[0070] Exemplarily, as shown in FIG3 , the target linear power density at the axial height Z3 in the fuel assembly X is detected as an example for explanation. If, at the target height position Z3 in each candidate fuel assembly (i.e., candidate fuel assembly A, candidate fuel assembly B, candidate fuel assembly C, and candidate fuel assembly D), only the in-pile detection equipment of candidate fuel assembly C and candidate fuel assembly D is not damaged, then the measured linear power density detected at the target height position Z3 in each candidate fuel assembly C and candidate fuel assembly D is obtained, and the target linear power density is determined based on the measured linear power density C detected at the target height position Z3 of candidate fuel assembly C, the measured linear power density D detected at the target height position Z3 of candidate fuel assembly D, the measurement weight C corresponding to candidate fuel assembly C, the measurement weight D corresponding to candidate fuel assembly D, the signal state C of the in-pile detection equipment set at the target height position Z3 in candidate fuel assembly C, and the signal state D of the in-pile detection equipment set at the target height position Z3 in candidate fuel assembly D.

[0071] It should be noted that the measurement weight in this embodiment can be determined based on the distance between the target fuel assembly and the candidate fuel assembly. Alternatively, the distance between the target fuel assembly and the candidate fuel assembly can be determined; and the measurement weight corresponding to the candidate fuel assembly can be determined based on the preset weight corresponding to the distance interval to which the distance belongs. Specifically, the server can determine the distance between the target fuel assembly and the candidate fuel assembly, further determine the preset weight corresponding to the distance interval for the distance, and use the preset weight as the measurement weight corresponding to the candidate fuel assembly.

[0072] Figure 4 is a schematic diagram of a process for determining the target line power density in one embodiment. To ensure the accuracy of the target line power density, this embodiment provides an optional method for determining the target line power density, including the following steps:

[0073] S401 performs polynomial interpolation processing on each measured linear power density to determine the intermediate linear power density at the target height position in the target fuel assembly.

[0074] Optionally, the server performs polynomial interpolation processing on each measured linear power density obtained by using a preset interpolation function to obtain the linear power density of the target fuel assembly, and uses the linear power density as the intermediate linear power density.

[0075] S402 determines the target line power density according to the positive or negative condition of the intermediate line power density.

[0076] Alternatively, since the fuel assembly will generate power during operation, the linear power density of the fuel assembly must not be negative. Therefore, the calculated intermediate linear power density needs to be further judged to avoid erroneous linear power density values. That is, if the intermediate linear power density is negative, the target linear power density is determined based on the target height position; if the intermediate linear power density is non-negative, the intermediate linear power density is used as the target linear power density. Specifically, when the intermediate linear power density is non-negative, the intermediate linear power density can be directly used as the target linear power density. However, when the intermediate linear power density is negative, the target linear power density needs to be further determined based on the actual position of the target height position in the target fuel assembly.

[0077] Optionally, an optional method for determining the target linear power density based on the target height position may be that, if the target height position is the head and tail height positions, the measured linear power density corresponding to the position adjacent to the target height position in the target fuel assembly is used as the target linear power density; if the target height position is the middle height position, the measured linear power densities corresponding to the two positions adjacent to the target height position in the target fuel assembly are linearly interpolated to obtain the target linear power density.

[0078] Specifically, if the target height position is the head and tail height positions in the target fuel assembly, the measured linear power density corresponding to the position adjacent to the head and tail height positions in the target fuel assembly can be used as the target linear power density; if the position of the middle linear power density is the middle height position, the measured linear power densities corresponding to the two positions adjacent to the target height position in the target fuel assembly are obtained, and the target linear power density of the target fuel assembly is determined by performing linear difference processing or mean processing on these two measured linear power densities.

[0079] For example, as shown in FIG3 , if the target height position is the axial height Z1 (i.e., the head height position) in the target fuel assembly X, the measured linear power density corresponding to the axial height Z2 is used as the target linear power density of the axial height Z1; if the target height position is the axial height Z5 (i.e., the tail height position) in the target fuel assembly X, the measured linear power density corresponding to the axial height Z4 is used as the target linear power density of the axial height Z5; if the target height position is the axial height Z3 (i.e., the middle height position) in the target fuel assembly X, the measured linear power density corresponding to the axial height Z2 and the measured linear power density corresponding to the axial height Z4 are linearly interpolated, and the result of the linear interpolation is used as the target linear power density of the axial height Z3.

[0080] The above-mentioned method for determining the target linear power density performs polynomial interpolation processing on each measured linear power density to determine the intermediate linear power density at the target height position in the target fuel assembly. The target linear power density is determined based on the positive or negative condition of the intermediate linear power density. This method determines the intermediate linear power density by performing polynomial interpolation processing on each measured linear power density, and further adjusts the intermediate linear power density to obtain the target linear power density, thereby ensuring that the determined target linear power density is more accurate.

[0081] In one embodiment, this embodiment provides an optional method for measuring line power density, and uses the method applied to a server as an example for illustration. As shown in FIG5 , the method includes the following steps:

[0082] S501 determines the setting of the in-pile detection equipment at the target height position of the target fuel assembly.

[0083] In the case where no in-core detection equipment is installed at the target height position of the target fuel assembly in the core, S502 detects whether the in-core detection equipment installed at the target height position in a preset number of candidate fuel assemblies adjacent to the target fuel assembly in the core is damaged. If damaged, execute step S503; if not damaged, execute step S508.

[0084] In step S503 , if the in-pile detection devices provided at the target height position in each candidate fuel assembly are all damaged, then the measured linear power densities corresponding to positions other than the target height position in the target fuel assembly are obtained.

[0085] Among them, the in-pile detection equipment installed in the candidate fuel assemblies at other locations was not damaged.

[0086] S504 performs polynomial interpolation processing on each measured linear power density to determine the intermediate linear power density at the target height position in the target fuel assembly.

[0087] S505 determines whether the intermediate line power density is a negative number. If so, execute step S506; if not, execute step S507.

[0088] If the intermediate linear power density is a negative number, the target linear power density is determined according to the target height position in the target fuel assembly at step S506.

[0089] Optionally, if the target height position is the head and tail height positions, the measured line power density corresponding to the position adjacent to the target height position in the target fuel assembly is used as the target line power density; if the target height position is the middle height position, the measured line power densities corresponding to the two positions adjacent to the target height position in the target fuel assembly are linearly interpolated to obtain the target line power density.

[0090] In step S507 , if the middle line power density is non-negative, the middle line power density is used as the target line power density.

[0091] S508: If at least one in-pile detection device is not damaged at the target height position in each candidate fuel assembly, the measured linear power density at the target height position in each candidate fuel assembly is obtained.

[0092] S509 determines the target linear power density based on the measured linear power density at the target height position in each candidate fuel assembly, the measurement weight corresponding to each candidate fuel assembly, and the signal status of the in-pile detection equipment set at the target height position in each candidate fuel assembly.

[0093] It should be noted that the measurement weight may be determined by determining the distance between the target fuel assembly and the candidate fuel assembly; and determining the measurement weight corresponding to the candidate fuel assembly based on the preset weight corresponding to the distance interval to which the distance belongs.

[0094] For example, as shown in FIG3 , the left figure shows the core structure, with each square representing a fuel assembly. In-core detection devices (i.e., SPNDs) are installed at each axial height (i.e., height position) of fuel assemblies A, B, C, and D. The right figure shows the structure of fuel assembly X in the core. Fuel assembly X is provided at five axial heights, i.e., Z1-Z5, and no SPNDs are installed at any of these heights. Taking the detection of the target linear power density at axial height Z3 of fuel assembly X as an example, since no SPND is installed at target height Z3 of target fuel assembly X in the core, assuming that the SPNDs installed at target height Z3 of a predetermined number of candidate fuel assemblies A, B, C, and D adjacent to target fuel assembly X in the core are all damaged, then in order to determine the target linear power density corresponding to target height Z3, it is necessary to first determine the measured linear power densities at other heights, Z1, Z2, Z4, and Z5. Here, taking the calculation of the measured linear power density corresponding to other height positions Z1 as an example, the linear power density of each candidate fuel assembly is obtained through the in-pile detectors installed at height position Z1 in candidate fuel assemblies A, B, C, and D. Based on each linear power density, the measurement weight corresponding to each candidate fuel assembly, and the signal status of the in-pile detection equipment installed at the target height position Z1 in each candidate fuel assembly, the measured linear power density at other height positions Z1 of the target fuel assembly X is determined. Based on the above method, the measured linear power density at other height positions Z2, Z4, and Z5 of the target fuel assembly X is determined. Based on the measured linear power density at other height positions Z1, Z2, Z4, and Z5 of the target fuel assembly X, linear interpolation is performed to calculate the target linear power density at the target height position Z3.

[0095] It should be understood that, although the various steps in the flowcharts involved in the various embodiments described above are shown in sequence as indicated by the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless otherwise specified herein, there is no strict order restriction on the execution of these steps, and these steps can be executed in other orders. Moreover, at least a portion of the steps in the flowcharts involved in the various embodiments described above may include multiple steps or multiple stages, and these steps or stages are not necessarily executed at the same time, but can be executed at different times. The execution order of these steps or stages is not necessarily to be carried out in sequence, but can be executed in turn or alternately with other steps or at least a portion of steps or stages in other steps.

[0096] Based on the same inventive concept, embodiments of the present application also provide a fuel assembly linear power density measurement device for implementing the aforementioned fuel assembly linear power density measurement method. The solution provided by this device is similar to the solution described in the aforementioned method. Therefore, the specific limitations of one or more of the following embodiments of the fuel assembly linear power density measurement device can be found in the aforementioned limitations of the fuel assembly linear power density measurement method and are not further elaborated here.

[0097] In an exemplary embodiment, as shown in FIG6 , a fuel assembly linear power density measurement device 1 is provided, comprising: a damage detection module 10 , a density acquisition module 11 , and a density determination module 12 , wherein:

[0098] The damage detection module 10 is configured to detect whether the in-pile detection devices installed at the target height positions of a predetermined number of candidate fuel assemblies adjacent to the target fuel assembly in the reactor core are damaged if no in-pile detection device is installed at the target height position of the target fuel assembly in the reactor core; the candidate fuel assemblies are installed with in-pile detection devices;

[0099] The density acquisition module 11 is configured to acquire the measurement line power density corresponding to positions other than the target height position in the target fuel assembly if the in-pile detection devices installed at the target height position in each candidate fuel assembly are all damaged, and the in-pile detection devices installed at the other positions in each candidate fuel assembly are not damaged;

[0100] The density determination module 12 determines a target linear power density at a target height position in a target fuel assembly based on each measured linear power density.

[0101] In one embodiment, as shown in FIG7 , the density determination module 12 in FIG6 includes:

[0102] The intermediate density determination unit 120 is configured to perform polynomial interpolation processing on each measured linear power density to determine the intermediate linear power density at the target height position in the target fuel assembly;

[0103] The target density determining unit 121 is configured to determine the target line power density according to the positive or negative condition of the intermediate line power density.

[0104] In one embodiment, the target density determination unit 121 in FIG7 includes:

[0105] a negative number subunit, for determining a target linear power density based on a target height position in a target fuel assembly if the intermediate linear power density is a negative number;

[0106] The non-negative subunit is used to take the intermediate line power density as the target line power density if the intermediate line power density is non-negative.

[0107] In one embodiment, the negative number subunit is also used for: if the target height position is the head and tail height positions, then the measured line power density corresponding to the position adjacent to the target height position in the target fuel assembly is used as the target line power density; if the target height position is the middle height position, then the measured line power densities corresponding to the two positions adjacent to the target height position in the target fuel assembly are linearly interpolated to obtain the target line power density.

[0108] In one embodiment, as shown in FIG8 , the fuel assembly linear power density measuring device 1 in FIG5 includes:

[0109] The intact equipment module 13 is configured to obtain the measured linear power density at the target height position of each candidate fuel assembly if at least one intact in-pile detection device exists at the target height position of each candidate fuel assembly; and determine the target linear power density based on the measured linear power density at the target height position of each candidate fuel assembly, the measurement weight corresponding to each candidate fuel assembly, and the signal status of the in-pile detection device set at the target height position of each candidate fuel assembly.

[0110] In one embodiment, the device in FIG8 does not damage the module 13, further comprising:

[0111] a distance determination unit 130 for determining the distance between the target fuel assembly and the candidate fuel assembly;

[0112] The weight determination unit 131 is configured to determine the measurement weight corresponding to the candidate fuel assembly according to the preset weight corresponding to the distance interval to which the distance belongs.

[0113] Each module in the aforementioned fuel assembly linear power density measurement device can be implemented in whole or in part through software, hardware, or a combination thereof. Each module can be embedded in or independent of a processor within a computer device in hardware form, or stored in a computer device memory in software form, allowing the processor to call and execute the corresponding operations of each module.

[0114] In an exemplary embodiment, a computer device is provided, which may be a server. Its internal structure diagram may be as shown in FIG9 . The computer device includes a processor, memory, an input / output (I / O) interface, and a communication interface. The processor, memory, and I / O interface are connected via a system bus, and the communication interface is connected to the system bus via the I / O interface. The processor of the computer device provides computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and internal memory. The non-volatile storage medium stores an operating system, a computer program, and a database. The internal memory provides an environment for the operating system and computer program in the non-volatile storage medium. The database of the computer device stores linear power density data. The I / O interface of the computer device is used to exchange information between the processor and external devices. The communication interface of the computer device is used to communicate with external terminals via a network connection. When executed by the processor, the computer program implements a method for measuring the linear power density of a fuel assembly.

[0115] Those skilled in the art will understand that the structure shown in Figure 9 is merely a block diagram of a portion of the structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than shown in the figure, or combine certain components, or have a different component arrangement.

[0116] In an exemplary embodiment, a computer device is provided, including a memory and a processor, wherein a computer program is stored in the memory, and when the processor executes the computer program, the following steps are implemented:

[0117] If no in-pile detection device is installed at a target height position of a target fuel assembly in the reactor core, detecting whether in-pile detection devices installed at target height positions in a preset number of candidate fuel assemblies adjacent to the target fuel assembly in the reactor core are damaged; the candidate fuel assemblies are installed with in-pile detection devices;

[0118] If the in-pile detection devices installed at the target height position of each candidate fuel assembly are all damaged, then obtain the measurement line power density corresponding to other positions of the target fuel assembly except the target height position, and the in-pile detection devices installed at the other positions of each candidate fuel assembly are not damaged;

[0119] The target linear power density at the target height position in the target fuel assembly is determined based on the measured linear power densities.

[0120] In one embodiment, when the processor executes the computer program, the processor further implements the following steps:

[0121] Performing polynomial interpolation processing on each measured linear power density to determine the median linear power density at the target height position in the target fuel assembly;

[0122] The target line power density is determined based on the positive or negative value of the intermediate line power density.

[0123] In one embodiment, when the processor executes the computer program, the processor further implements the following steps:

[0124] If the intermediate linear power density is negative, the target linear power density is determined based on the target height position in the target fuel assembly;

[0125] If the middle line power density is non-negative, the middle line power density is used as the target line power density.

[0126] In one embodiment, when the processor executes the computer program, the processor further implements the following steps:

[0127] If the target height position is the fore-aft height position, the measured linear power density corresponding to the position adjacent to the target height position in the target fuel assembly is used as the target linear power density;

[0128] If the target height position is an intermediate height position, linear interpolation processing is performed on the measured linear power densities corresponding to two adjacent positions of the target height position in the target fuel assembly to obtain the target linear power density.

[0129] In one embodiment, when the processor executes the computer program, the processor further implements the following steps:

[0130] If at least one in-pile detection device is not damaged at the target height position in each candidate fuel assembly, obtaining the measured linear power density at the target height position in each candidate fuel assembly;

[0131] The target linear power density is determined based on the measured linear power density at the target height position in each candidate fuel assembly, the measurement weight corresponding to each candidate fuel assembly, and the signal status of the in-pile detection equipment set at the target height position in each candidate fuel assembly.

[0132] In one embodiment, when the processor executes the computer program, the processor further implements the following steps:

[0133] determining the distance between the target fuel assembly and the candidate fuel assembly;

[0134] The measurement weight corresponding to the candidate fuel assembly is determined based on the preset weight corresponding to the distance interval to which the distance belongs.

[0135] In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the following steps are implemented:

[0136] If no in-pile detection device is installed at a target height position of a target fuel assembly in the reactor core, detecting whether in-pile detection devices installed at target height positions in a preset number of candidate fuel assemblies adjacent to the target fuel assembly in the reactor core are damaged; the candidate fuel assemblies are installed with in-pile detection devices;

[0137] If the in-pile detection devices installed at the target height position of each candidate fuel assembly are all damaged, then obtain the measurement line power density corresponding to other positions of the target fuel assembly except the target height position, and the in-pile detection devices installed at the other positions of each candidate fuel assembly are not damaged;

[0138] The target linear power density at the target height position in the target fuel assembly is determined based on the measured linear power densities.

[0139] In one embodiment, when the computer program is executed by a processor, the following steps are further implemented:

[0140] Performing polynomial interpolation processing on each measured linear power density to determine the median linear power density at the target height position in the target fuel assembly;

[0141] The target line power density is determined based on the positive or negative value of the intermediate line power density.

[0142] In one embodiment, when the computer program is executed by a processor, the following steps are further implemented:

[0143] If the intermediate linear power density is negative, the target linear power density is determined based on the target height position in the target fuel assembly;

[0144] If the middle line power density is non-negative, the middle line power density is used as the target line power density.

[0145] In one embodiment, when the computer program is executed by a processor, the following steps are further implemented:

[0146] If the target height position is the fore-aft height position, the measured linear power density corresponding to the position adjacent to the target height position in the target fuel assembly is used as the target linear power density;

[0147] If the target height position is an intermediate height position, linear interpolation processing is performed on the measured linear power densities corresponding to two adjacent positions of the target height position in the target fuel assembly to obtain the target linear power density.

[0148] In one embodiment, when the computer program is executed by a processor, the following steps are further implemented:

[0149] If at least one in-pile detection device is not damaged at the target height position in each candidate fuel assembly, obtaining the measured linear power density at the target height position in each candidate fuel assembly;

[0150] The target linear power density is determined based on the measured linear power density at the target height position in each candidate fuel assembly, the measurement weight corresponding to each candidate fuel assembly, and the signal status of the in-pile detection equipment set at the target height position in each candidate fuel assembly.

[0151] In one embodiment, when the computer program is executed by a processor, the following steps are further implemented:

[0152] determining the distance between the target fuel assembly and the candidate fuel assembly;

[0153] The measurement weight corresponding to the candidate fuel assembly is determined based on the preset weight corresponding to the distance interval to which the distance belongs.

[0154] In one embodiment, a computer program product is provided, comprising a computer program, which, when executed by a processor, implements the following steps:

[0155] If no in-pile detection device is installed at a target height position of a target fuel assembly in the reactor core, detecting whether in-pile detection devices installed at target height positions in a preset number of candidate fuel assemblies adjacent to the target fuel assembly in the reactor core are damaged; the candidate fuel assemblies are installed with in-pile detection devices;

[0156] If the in-pile detection devices installed at the target height position of each candidate fuel assembly are all damaged, then obtain the measurement line power density corresponding to other positions of the target fuel assembly except the target height position, and the in-pile detection devices installed at the other positions of each candidate fuel assembly are not damaged;

[0157] The target linear power density at the target height position in the target fuel assembly is determined based on the measured linear power densities.

[0158] In one embodiment, when the computer program is executed by a processor, the following steps are further implemented:

[0159] Performing polynomial interpolation processing on each measured linear power density to determine the median linear power density at the target height position in the target fuel assembly;

[0160] The target line power density is determined based on the positive or negative value of the intermediate line power density.

[0161] In one embodiment, when the computer program is executed by a processor, the following steps are further implemented:

[0162] If the intermediate linear power density is negative, the target linear power density is determined based on the target height position in the target fuel assembly;

[0163] If the middle line power density is non-negative, the middle line power density is used as the target line power density.

[0164] In one embodiment, when the computer program is executed by a processor, the following steps are further implemented:

[0165] If the target height position is the fore-aft height position, the measured linear power density corresponding to the position adjacent to the target height position in the target fuel assembly is used as the target linear power density;

[0166] If the target height position is an intermediate height position, linear interpolation processing is performed on the measured linear power densities corresponding to two adjacent positions of the target height position in the target fuel assembly to obtain the target linear power density.

[0167] In one embodiment, when the computer program is executed by a processor, the following steps are further implemented:

[0168] If at least one in-pile detection device is not damaged at the target height position in each candidate fuel assembly, obtaining the measured linear power density at the target height position in each candidate fuel assembly;

[0169] The target linear power density is determined based on the measured linear power density at the target height position in each candidate fuel assembly, the measurement weight corresponding to each candidate fuel assembly, and the signal status of the in-pile detection equipment set at the target height position in each candidate fuel assembly.

[0170] In one embodiment, when the computer program is executed by a processor, the following steps are further implemented:

[0171] determining the distance between the target fuel assembly and the candidate fuel assembly;

[0172] The measurement weight corresponding to the candidate fuel assembly is determined based on the preset weight corresponding to the distance interval to which the distance belongs.

[0173] It should be noted that the data involved in this application (including but not limited to data used for analysis, stored data, displayed data, etc.) are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of relevant data must comply with relevant regulations.

[0174] Those skilled in the art will appreciate that all or part of the processes in the above-mentioned embodiment methods can be implemented by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to memory, database or other media used in the embodiments provided in this application may include at least one of non-volatile and volatile memory. Non-volatile memory may include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory may include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM). The database involved in the various embodiments provided herein may include at least one of a relational database and a non-relational database. Non-relational databases may include, but are not limited to, distributed databases based on blockchains. The processor involved in the various embodiments provided herein may be, but are not limited to, a general-purpose processor, a central processing unit, a graphics processing unit, a digital signal processor, a programmable logic unit, a data processing logic unit based on quantum computing, and the like.

[0175] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0176] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present application shall be determined by the appended claims.

Claims

1. A method for measuring the linear power density of a fuel assembly, characterized in that: The method comprises: In the case where no in-pile detection device is provided at a target height position of a target fuel assembly in a core, detecting whether in-pile detection devices provided at the target height positions in a preset number of candidate fuel assemblies adjacent to the target fuel assembly in the core are damaged; the candidate fuel assemblies are provided with in-pile detection devices; If the in-pile detection devices arranged at the target height position in each of the candidate fuel assemblies are damaged, obtaining the measurement line power density corresponding to other positions of the target fuel assembly except the target height position, and the in-pile detection devices arranged at other positions in each of the candidate fuel assemblies are not damaged; A target linear power density at the target height position in the target fuel assembly is determined based on each of the measured linear power densities.

2. The method according to claim 1, characterized in that: Determining the target linear power density at the target height position in the target fuel assembly according to each of the measured linear power densities includes: Performing polynomial interpolation processing on each of the measured line power densities to determine the intermediate line power density at the target height position in the target fuel assembly; The target line power density is determined according to the positive or negative condition of the intermediate line power density.

3. The method according to claim 2, characterized in that The step of determining the target line power density according to the positive or negative condition of the intermediate line power density includes: If the intermediate linear power density is a negative number, determining the target linear power density according to the target height position in the target fuel assembly; If the intermediate line power density is non-negative, the intermediate line power density is used as the target line power density.

4. The method according to claim 3, characterized in that Determining the target linear power density according to the target height position in the target fuel assembly includes: If the target height position is the head and tail height position, the measured linear power density corresponding to the height position adjacent to the target height position in the target fuel assembly is used as the target linear power density; If the target height position is an intermediate height position, linear interpolation processing is performed on the measured linear power densities corresponding to two height positions adjacent to the target height position in the target fuel assembly to obtain the target linear power density.

5. The method according to claim 1, characterized in that The method further comprises: If at least one in-pile detection device is not damaged at the target height position in each candidate fuel assembly, obtaining a measurement line power density at the target height position in each candidate fuel assembly; The target linear power density is determined based on the measured linear power density at the target height position in each of the candidate fuel assemblies, the measurement weight corresponding to each of the candidate fuel assemblies, and the signal state of the in-pile detection equipment set at the target height position in each of the candidate fuel assemblies.

6. The method according to claim 5, characterized in that The method further comprises: determining a distance between the target fuel assembly and the candidate fuel assembly; The measurement weight corresponding to the candidate fuel assembly is determined according to a preset weight corresponding to the distance interval to which the distance belongs.

7. A fuel assembly linear power density measuring device, characterized in that: The device comprises: a damage detection module, for detecting whether the in-pile detection devices arranged at the target height position of the target fuel assembly in the core are damaged when no in-pile detection device is arranged at the target height position of the target fuel assembly in the core; A density acquisition module, configured to acquire the measurement line power density corresponding to other positions of the target fuel assembly except the target height position if the in-pile detection devices arranged at the target height position of each candidate fuel assembly are damaged, and the in-pile detection devices arranged in each candidate fuel assembly at the other positions are not damaged; The density determination module is used to determine the target linear power density at the target height position in the target fuel assembly according to each of the measured linear power densities.

8. A computer device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 6 are implemented.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 6 are implemented.

10. A computer program product, comprising a computer program, characterized in that When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 6 are implemented.

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