Method, apparatus and computer device for determining linear power density of fuel assembly

Abstract

The present application relates to a method, device, computer equipment, storage medium, and computer program product for determining the linear power density of a fuel assembly. The method includes: obtaining status signals of neutron detectors at a preset height in each finger thimble of a first finger thimble group corresponding to a fuel assembly to be measured; taking the fuel assembly to be measured as the center, there are multiple corresponding finger thimble groups around the fuel assembly to be measured, and each finger thimble group includes multiple finger thimbles; when it is determined according to the status signals that the neutron detectors at the preset height in each finger thimble of the first finger thimble group are all abnormal, determining a second finger thimble group corresponding to the fuel assembly to be measured; selecting at least one effective finger thimble from the second finger thimble group as a target finger thimble; and determining the linear power density of the fuel assembly to be measured based on the data detected by the neutron detectors at the preset height in the target finger thimble. Using this method can improve the accuracy of the linear power density.

Description

Technical Field

[0001] This application relates to the field of nuclear energy technology, and particularly to a method, device, computer equipment, storage medium, and computer program product for determining the linear power density of a fuel assembly. Background Art

[0002] With the development of nuclear engineering technology, in order to ensure the safety of the reactor, it is necessary to continuously monitor the distribution of power in the reactor along three spatial dimensions.

[0003] In traditional methods, common core power reconstruction methods include thin plate spline function fitting method, polynomial expansion method, and ordinary Kriging method, etc. Taking the polynomial expansion method as an example, measurement data in the reactor can be collected, and then the geometry of the reactor is divided into multiple grids. The three-dimensional power distribution of the core is represented by a polynomial within each grid. According to the principle of polynomial expansion, through an optimization algorithm, the optimal polynomial coefficients are solved and substituted into a preset polynomial function to obtain an estimated result of the power distribution of the core.

[0004] However, in the case of neutron detector failure, the data of a certain grid in the polynomial expansion method will be missing or incorrect, resulting in a decrease in data continuity and a reduction in the accuracy of the linear power density of the fuel assembly. Summary of the Invention

[0005] Based on this, it is necessary to provide a method, device, computer equipment, computer-readable storage medium, and computer program product for determining the linear power density of a fuel assembly that can improve the accuracy of the linear power density in view of the above technical problems.

[0006] In a first aspect, this application provides a method for determining the linear power density of a fuel assembly. The method includes: obtaining the status signals of the neutron detectors at a preset height of each finger tube in the first finger tube group corresponding to the fuel assembly to be measured; taking the fuel assembly to be measured as the center, there are multiple corresponding finger tube groups around the fuel assembly to be measured, and each finger tube group includes multiple finger tubes; when it is determined according to the status signals that the neutron detectors at the preset height in each finger tube in the first finger tube group are all abnormal, determining the second finger tube group corresponding to the fuel assembly to be measured; the distance between each finger tube in the second finger tube group and the fuel assembly to be measured is greater than the distance between each finger tube in the first finger tube group and the fuel assembly to be measured; selecting at least one effective finger tube from the second finger tube group as the target finger tube; the neutron detector at the preset height in the effective finger tube is in a normal state; determining the linear power density of the fuel assembly to be measured based on the data detected by the neutron detectors at the preset height in the target finger tube.

[0007] Second aspect, the present application also provides a device for determining the linear power density of a fuel assembly. The device includes: a signal acquisition module, configured to acquire the status signals of the neutron detectors at a preset height in each finger tube of the first finger tube group corresponding to the fuel assembly to be measured; with the fuel assembly to be measured as the center, there are multiple corresponding finger tube groups around the fuel assembly to be measured, and each of the finger tube groups includes multiple finger tubes; a first selection module, configured to determine a second finger tube group corresponding to the fuel assembly to be measured when it is determined according to the status signals that the neutron detectors at the preset height in each finger tube of the first finger tube group are all abnormal; the distance between each finger tube in the second finger tube group and the fuel assembly to be measured is greater than the distance between each finger tube in the first finger tube group and the fuel assembly to be measured; a second selection module, configured to select at least one effective finger tube from the second finger tube group as the target finger tube; the neutron detector at the preset height in the effective finger tube is in a normal state; a linear power density determination module, configured to determine the linear power density of the fuel assembly to be measured based on the data detected by the neutron detectors at the preset height in the target finger tubes.

[0008] In some embodiments, the linear power density determination module is further configured to, for each selected target finger tube, obtain the axial linear power determined at the preset height of the target finger tube based on the data detected by the neutron detector at the preset height of the target finger tube; and determine the linear power density of the fuel assembly to be measured based on the axial linear powers respectively determined at the preset height of each selected target finger tube.

[0009] In some embodiments, the linear power density determination module is further configured to determine the weight corresponding to each selected target finger tube; and perform weighting on the axial linear powers respectively determined at the preset height of each selected target finger tube based on the weights corresponding to each selected target finger tube to obtain the linear power density of the fuel assembly to be measured.

[0010] In some embodiments, the linear power density determination module is further configured to, for each selected target finger tube, determine the weight corresponding to the target finger tube according to the distance between the target finger tube and the fuel assembly to be measured; wherein, the distance between the target finger tube and the fuel assembly to be measured is negatively correlated with the weight corresponding to the target finger tube.

[0011] In some embodiments, the linear power density determination module is further configured to, when it is determined according to each of the state signals that the neutron detectors at a preset height in at least one finger thimble in the first finger thimble group are in a normal state, select at least one of the effective finger thimbles from the first finger thimble group as a standard finger thimble; and determine the linear power density of the fuel assembly to be measured based on the axial linear power respectively determined at the preset height of the standard finger thimble.

[0012] In some embodiments, the linear power density determination module is further configured to, when there are multiple effective finger thimbles in the first finger thimble group, select a first number of the effective finger thimbles from the multiple effective finger thimbles in the first finger thimble group as the standard finger thimbles; wherein the first number is less than or equal to a second number, and the second number is the number of finger thimbles in the nearest finger thimble group corresponding to the fuel assembly to be measured; the distance between each finger thimble in the nearest finger thimble group and the fuel assembly to be measured is less than the distance between each finger thimble in other finger thimble groups corresponding to the fuel assembly to be measured.

[0013] In a third aspect, the present application further provides a computer device. The computer device includes a memory and a processor, the memory stores a computer program, and when the processor executes the computer program, the steps in the above fuel assembly linear power density determination method are implemented.

[0014] In a fourth aspect, the present application further provides a computer-readable storage medium. On the computer-readable storage medium, a computer program is stored, and when the computer program is executed by a processor, the steps in the above fuel assembly linear power density determination method are implemented.

[0015] In a fifth aspect, the present application further provides a computer program product. The computer program product includes a computer program, and when the computer program is executed by a processor, the steps in the above fuel assembly linear power density determination method are implemented.

[0016] The above method, device, computer device, storage medium, and computer program product for determining the linear power density of a fuel assembly obtain the status signals of the neutron detectors at a preset height in each finger tube of the first finger tube group corresponding to the fuel assembly to be measured. With the fuel assembly to be measured as the center, there are multiple corresponding finger tube groups around the fuel assembly to be measured, and each finger tube group includes multiple finger tubes. When it is determined according to the status signals that the neutron detectors at the preset height in each finger tube of the first finger tube group are all abnormal, the second finger tube group corresponding to the fuel assembly to be measured is determined. The distance between each finger tube in the second finger tube group and the fuel assembly to be measured is greater than the distance between each finger tube in the first finger tube group and the fuel assembly to be measured. At least one effective finger tube is selected from the second finger tube group as the target finger tube. Based on the data detected by the neutron detectors at the preset height in the target finger tube, the linear power density of the fuel assembly to be measured is determined. When the neutron detectors with a relatively short distance around each fuel assembly are all abnormal, by using the data obtained by the neutron detectors with a relatively long distance around each fuel assembly, the calculation error of the linear power density of each fuel assembly can be reduced, thereby improving the accuracy of the linear power density. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the following will briefly introduce the drawings required for use in the description of the embodiments or related technologies. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0018] Figure 1 It is an application environment diagram of the method for determining the linear power density of a fuel assembly in an embodiment;

[0019] Figure 2 It is a flowchart of the method for determining the linear power density of a fuel assembly in an embodiment;

[0020] Figure 3 It is a flowchart of the steps for determining the linear power density in an embodiment;

[0021] Figure 4 It is a distribution diagram of the fuel assembly to be measured and the finger tubes in an embodiment;

[0022] Figure 5 It is a structural block diagram of the device for determining the linear power density of a fuel assembly in an embodiment;

[0023] Figure 6 It is an internal structure diagram of a computer device in an embodiment;

[0024] Figure 7It is the internal structure diagram of a computer device in another embodiment. Detailed implementation manners

[0025] In order to make the objectives, technical solutions and advantages of the present application more clear and understandable, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0026] The method for determining the linear power density of a fuel assembly provided by an embodiment of the present application can be applied to, for example, Figure 1 the application environment shown. Among them, the computer device 102 collects relevant information of the fuel assembly to be measured, and the data storage system can store the data that the computer device 102 needs to process. The data storage system can be integrated on the computer device 102, or placed in the cloud or other network servers.

[0027] Specifically, the computer device 102 obtains the status signals of the neutron detectors at a preset height of each finger tube in the first finger tube group corresponding to the fuel assembly 104 to be measured. With the fuel assembly 104 to be measured as the center, there are multiple finger tube groups around the fuel assembly to be measured, and each finger tube group includes multiple corresponding finger tubes. When the computer device 102 determines, according to each status signal, that the neutron detectors at the preset height in each finger tube in the first finger tube group are all abnormal, it determines the second finger tube group corresponding to the fuel assembly 104 to be measured. The distance between each finger tube in the second finger tube group and the fuel assembly 104 to be measured is greater than the distance between each finger tube in the first finger tube group and the fuel assembly 104 to be measured. The computer device 102 selects at least one effective finger tube from the second finger tube group as the target finger tube. The computer device 102 can determine the linear power density of the fuel assembly 104 to be measured based on the data detected by the neutron detectors at the preset height in the target finger tube.

[0028] Among them, the computer device 102 can be a terminal or a server. The terminal can be, but is not limited to, various measurement devices, various personal computers, laptop computers, smart phones, tablet computers, Internet of Things devices, and portable wearable devices. The Internet of Things devices can be smart speakers, smart TVs, smart air conditioners, smart in-vehicle devices, etc. The portable wearable devices can be smart watches, smart bracelets, head-mounted devices, etc. The server can be implemented by an independent server or a server cluster composed of multiple servers.

[0029] In an exemplary embodiment, as Figure 2 shown, a method for determining the linear power density of a fuel assembly is provided. Taking the method applied to the Figure 1 computer device 102 as an example, the method includes the following steps 202 to 208. Among them:

[0030] Step 202: Obtain the status signals of the neutron detectors at a preset height in each finger tube of the first finger tube group corresponding to the fuel assembly to be measured. With the fuel assembly to be measured as the center, there are multiple corresponding finger tube groups around the fuel assembly to be measured, and each finger tube group includes multiple finger tubes.

[0031] Among them, the fuel assembly is a structure for placing and storing nuclear fuel. The fuel assembly is the basic unit that constitutes the reactor core, and multiple fuel assemblies are arranged in the reactor core to form a specific geometric structure. The fuel assembly to be measured is the fuel assembly for which the linear power density is to be determined. The reactor core is the core area of the reactor, and the reactor also includes components such as a reactor vessel, a coolant system, and a control system. The finger tube is a neutron flux tube in the reactor core, used to measure and monitor the neutron flux distribution in the nuclear reactor. The finger tube group is a set composed of multiple finger tubes around the fuel assembly to be measured. The status signal is a signal reflecting the operating state of the neutron detector. Multiple means at least two. The neutron detector is a device for detecting the presence and characteristics of neutrons, including various types such as self-powered neutron detectors (SPND, Self-Powered Neutron Detector).

[0032] The fuel assembly to be measured can be any shape such as columnar, rod-shaped, tubular, plate-shaped, and spherical, etc., which is not limited here. In the embodiments of the present application, a columnar fuel assembly is used. The reactor contains multiple fuel assemblies and multiple finger tubes. With the fuel assembly for which the linear power density is to be determined (i.e., the fuel assembly to be measured hereinafter) as the center, the multiple finger tubes can be divided into multiple corresponding finger tube groups. It should be noted that in some embodiments, the reactor may include multiple categories of finger tubes, and the finger tubes of the same category are connected to the same device, such as a cabinet. Among the multiple finger tube groups corresponding to the fuel assembly to be measured, at least two finger tubes in the same finger tube group belong to different categories, that is, they are connected to at least two different devices. If all the finger tubes in the same finger tube group are connected to the same device, when the device fails, all the detectors in the finger tube group connected to it will fail. However, in this embodiment, since at least two finger tubes in the same finger tube group belong to different categories, that is, they are connected to at least two different devices, this can avoid the failure of all neutron detectors in the entire finger tube group due to a failure of a certain device.

[0033] A plurality of finger tube groups around the fuel assembly to be measured can determine the levels of each finger tube group according to the distance between the finger tube group and the fuel assembly to be measured. The farther the distance, the higher the level. The distance between the finger tube group and the fuel assembly to be measured refers to the distance between the finger tubes in the finger tube group and the fuel assembly to be measured. In some embodiments, any one of the plurality of finger tube groups can be selected as the first finger tube group corresponding to the fuel assembly to be measured. For example, the finger tube group closest to the fuel assembly to be measured is used as the first finger tube group. Each finger tube group includes at least one finger tube. Among them, in some embodiments, the distances from all the finger tubes in the same finger tube group to the fuel assembly to be measured are the same.

[0034] For each finger tube, a plurality of neutron detectors are arranged on the finger tube, and the height of each neutron detector on the finger tube is predetermined. The preset height can be any preset height, and each finger tube is respectively provided with a neutron detector at the preset height. For example, n different preset heights are preset, which are z1, z2, …, z n . Among them, z i is the i-th preset height, where 1 ≤ i ≤ n.

[0035] There are a plurality of neutron detectors at the preset heights in the axial direction of all the finger tubes around each fuel assembly. The neutron detectors are used to detect the neutron flux density at the corresponding preset heights in the axial direction, and the probe structure inside the neutron detector is used to judge the operating state of the neutron detector itself.

[0036] The operating state of the neutron detector can be represented by a status signal. The status signal is divided into two cases: a normal signal and an abnormal signal. When the status signal is a normal signal, it means that the neutron detector can work normally. When the status signal is an abnormal signal, it means that the neutron detector cannot work normally. The status signal of the neutron detector at the i-th preset height of the j-th finger tube can be expressed as s(a j , i), where a j refers to the j-th finger tube in the finger tube group, and i refers to the i-th preset height. When the status signal is the first preset value, it means that the neutron detector is normal. When the status signal is the second preset value, it means that the neutron detector is abnormal. The first preset value is different from the second preset value. For example, the first preset value is 1 and the second preset value is 0, or the first preset value is 0 and the second preset value is 1.

[0037] Specifically, in some embodiments, the status of the neutron detector can also be determined according to the data detected by the neutron detector. For example, when the neutron detector detects abnormal data, such as detecting the data 0, it can be considered that the neutron detector is in an abnormal state at this time.

[0038] In some embodiments, the computer device selects a first finger sleeve group around the fuel assembly to be measured and obtains the status signals of the neutron detectors corresponding to each finger sleeve in the first finger sleeve group at a preset height in the axial direction.

[0039] Step 204, when it is determined according to the status signals that the neutron detectors at the preset height in each finger sleeve of the first finger sleeve group are all abnormal, determine a second finger sleeve group corresponding to the fuel assembly to be measured; the distance between each finger sleeve in the second finger sleeve group and the fuel assembly to be measured is greater than the distance between each finger sleeve in the first finger sleeve group and the fuel assembly to be measured.

[0040] Among them, the second finger sleeve group is one of the multiple finger sleeve groups around the fuel assembly to be measured, but is not the same as the first finger sleeve group. The distance between each finger sleeve in the second finger sleeve group and the fuel assembly to be measured is greater than the distance between each finger sleeve in the first finger sleeve group and the fuel assembly to be measured. Exemplarily, in some embodiments, each finger sleeve group around the fuel assembly to be measured may correspond to a level, and the level is determined according to the distance between the finger sleeve group and the fuel assembly to be measured. The greater the distance, the higher the level. Therefore, it is necessary to determine the second finger sleeve group from the finger sleeve groups with levels higher than that of the first finger sleeve group. For example, if the first finger sleeve group corresponds to level 1 and there are a total of 5 levels of finger sleeve groups around the fuel assembly to be measured, the second finger sleeve group can be selected from the finger sleeve groups corresponding to levels 2 to 5.

[0041] Specifically, the computer device uses the probe structure inside the neutron detector to judge the operating state of the neutron detector. When the probe structure inside the neutron detector detects that the neutron detectors of all the finger sleeves in the first finger sleeve group are abnormal at the preset height in the axial direction, the computer device can select the second finger sleeve group. The computer device selects another finger sleeve group other than the first finger sleeve group around the fuel assembly to be measured as the second finger sleeve group. For example, assume that the fuel assembly to be measured is numbered k and the preset height is z i , when the status signals of the neutron detectors of all the finger sleeves in the first finger sleeve group at the preset height z i are all abnormal signals, select the second finger sleeve group around the fuel assembly k. The distance from each finger sleeve in the second finger sleeve group selected by the computer device to the fuel assembly to be measured is also the same, and the distance from each finger sleeve in the second finger sleeve group to the fuel assembly to be measured is greater than the distance from each finger sleeve in the first finger sleeve group to the fuel assembly to be measured.

[0042] Further, in some embodiments, the second finger sleeve group may be the nearest effective finger sleeve group to the first finger sleeve group among the effective finger sleeve groups around the fuel assembly to be measured, and the effective finger sleeve group is a finger sleeve group in which at least one effective finger sleeve exists.

[0043] If the neutron detector at the preset height in a certain finger sleeve is in a normal state, then this finger sleeve can be considered as an effective finger sleeve. Similarly, when there is at least one effective finger sleeve in a certain set of finger sleeves, that is, there is at least one finger sleeve in which the neutron detector at the preset height is in a normal state, then this set of finger sleeves can be considered as an effective set of finger sleeves. In the case where the neutron detectors at the preset height in each finger sleeve of the first set of finger sleeves are all abnormal, that is, there is no effective finger sleeve in the first set of finger sleeves, the first set of finger sleeves is not an effective set of finger sleeves. At this time, the second set of finger sleeves can be the effective set of finger sleeves closest to the first set of finger sleeves among the effective sets of finger sleeves around the fuel assembly to be measured.

[0044] Specifically, in some embodiments, in the case where the neutron detectors at the preset height in each finger sleeve of the first set of finger sleeves are all abnormal, all the sets of finger sleeves with a distance from the fuel assembly to be measured greater than the distance between the first set of finger sleeves and the fuel assembly to be measured can be selected first. Subsequently, among the selected multiple sets of finger sleeves, the set of finger sleeves closest to the first set of finger sleeves is selected, and it is determined whether the selected set of finger sleeves is an effective set of finger sleeves. If so, this set of finger sleeves is used as the second set of finger sleeves; otherwise, the set of finger sleeves second closest to the first set of finger sleeves is selected among the selected multiple sets of finger sleeves, and the above determination step is repeated.

[0045] For example, in some embodiments, each set of finger sleeves around the fuel assembly to be measured can correspond to a level, and the level is determined according to the distance between the set of finger sleeves and the fuel assembly to be measured. The greater the distance, the higher the level. At this time, the second set of finger sleeves can be determined from the sets of finger sleeves other than the first set of finger sleeves in the order from the lowest level to the highest level. Specifically, an iterative method can be used to determine the second set of finger sleeves. The level corresponding to the first set of finger sleeves is determined as the initial level, and the level adjacent to and higher than the initial level is determined as the candidate level. For example, if the level of the first set of finger sleeves is 1, the candidate level is 2. The set of finger sleeves corresponding to the candidate level is obtained to get the candidate set of finger sleeves. If the neutron detectors at the preset height in each finger sleeve of the candidate finger sleeves are all in an abnormal state, that is, it can be considered that this candidate set of finger sleeves is not an effective set of finger sleeves, then the level adjacent to and higher than the candidate level is determined as the next-round candidate level, and the step of obtaining the set of finger sleeves corresponding to the candidate level to get the candidate set of finger sleeves is returned to find a new candidate set of finger sleeves. If there is a finger sleeve in the candidate set of finger sleeves in which the neutron detector at the preset height is in a normal state, that is, it can be considered that this candidate set of finger sleeves is an effective set of finger sleeves, then this candidate set of finger sleeves is determined as the second set of finger sleeves.

[0046] Of course, in some embodiments, it is also possible to first select all the effective finger thimble groups whose distance from the fuel assembly to be measured is greater than the distance between the first finger thimble group and the fuel assembly to be measured, and then select the effective finger thimble group closest to the first finger thimble group as the second finger thimble, which is not limited herein.

[0047] In this embodiment, since the second finger thimble group is the effective finger thimble group closest to the first finger thimble group, the error caused by the increase in the distance between the finger thimble group and the fuel assembly can be reduced, thereby improving the accuracy of the linear power density.

[0048] Step 206: Select at least one effective finger thimble from the second finger thimble group as the target finger thimble; the neutron detector at the preset height in the effective finger thimble is in a normal state.

[0049] Among them, the neutron detector at the preset height in the effective finger thimble is in a normal state, and the effective finger thimble mentioned hereinafter is also interpreted in this way and will not be elaborated. The target finger thimble belongs to the second finger thimble group, and the neutron detector at the preset height in the target finger thimble is in a normal state.

[0050] Specifically, the computer device selects at least one effective finger thimble from the second finger thimble group as the target finger thimble. For example, the computer device can select one effective finger thimble from the second finger thimble group as the target finger thimble. Or, the computer device can select all the effective finger thimbles from the second finger thimble group as the target finger thimble.

[0051] It should be noted that in some embodiments, in order to obtain a more accurate linear power density of the fuel assembly to be measured, calculations need to be performed based on the data detected by a preset number of neutron detectors. If the number of neutron detectors at the preset height in each finger thimble in the second finger thimble group that are in a normal state is greater than the preset number, that is, the number of effective finger thimbles in the second finger thimble group is greater than the preset number, then select a preset number of effective finger thimbles from the second finger thimble group as the target finger thimbles. If the number of neutron detectors at the preset height in each finger thimble in the second finger thimble group that are in a normal state is less than the preset number, that is, the number of effective finger thimbles in the second finger thimble group is less than the preset number, then all the effective finger thimbles in the second finger thimble group can be used as the target finger thimbles.

[0052] Step 208: Determine the linear power density of the fuel assembly to be measured based on the data detected by the neutron detector at the preset height in the target finger thimble.

[0053] Among them, the linear power density is the power output per unit length of the fuel assembly to be measured. The data detected by the neutron detector includes neutron intensity, neutron flux density, neutron energy spectrum, etc.

[0054] Specifically, the computer device analyzes and calculates based on the data detected by the neutron detector at a preset height of the target finger sleeve selected from the second finger sleeve group, and obtains the linear power density of the fuel assembly to be measured.

[0055] In some embodiments, the neutron detector can detect the neutron flux density at a preset height. The computer device can calculate the axial linear power of the finger sleeve at the preset height in the axial direction according to the neutron flux density, and calculate the linear power density of the fuel assembly to be measured according to each axial linear power.

[0056] In the above method for determining the linear power density of the fuel assembly, the status signals of the neutron detectors of each finger sleeve at a preset height in the first finger sleeve group corresponding to the fuel assembly to be measured are obtained. Taking the fuel assembly to be measured as the center, there are multiple corresponding finger sleeve groups around the fuel assembly to be measured. Each finger sleeve group includes multiple finger sleeves. When it is determined according to each status signal that the neutron detectors at the preset height in each finger sleeve in the first finger sleeve group are all abnormal, the second finger sleeve group corresponding to the fuel assembly to be measured is determined. The distance between each finger sleeve in the second finger sleeve group and the fuel assembly to be measured is greater than the distance between each finger sleeve in the first finger sleeve group and the fuel assembly to be measured. At least one effective finger sleeve is selected from the second finger sleeve group as the target finger sleeve, and the linear power density of the fuel assembly to be measured is determined based on the data detected by the neutron detector located at the preset height in the target finger sleeve. When the neutron detectors with relatively close distances around each fuel assembly are all abnormal, by using the data obtained by the neutron detectors with relatively far distances around each fuel assembly, the calculation error of the linear power density of each fuel assembly can be reduced, thereby improving the accuracy of the linear power density.

[0057] In an exemplary embodiment, as Figure 3 shown, step 208 includes steps 302 to 304. Among them:

[0058] Step 302, for each selected target finger sleeve, based on the data detected by the neutron detector at the preset height in the target finger sleeve, obtain the axial linear power determined by the target finger sleeve at the preset height.

[0059] Among them, the axial linear power is the power transmitted by the finger sleeve at the preset height along the preset axial direction.

[0060] Specifically, the computer device calculates the axial linear power of the target finger sleeve selected from the second finger sleeve group at the preset height according to the detected data. The detected data comes from the neutron detector set at the preset height in the target finger sleeve selected from the second finger sleeve group.

[0061] In some embodiments, the neutron detector can detect the neutron flux density of the target finger sleeve at a preset height. Based on the correlation between the neutron flux density and the corresponding current data, the current corresponding to the target finger sleeve at the preset height can be obtained. Based on the positive correlation between the current corresponding to the target finger sleeve at the preset height and the axial linear power of the target finger sleeve at the preset height, the axial linear power of the target finger sleeve at the preset height can be calculated.

[0062] Step 304: Based on the axial linear powers respectively determined for each selected target finger sleeve at the preset height, determine the linear power density of the fuel assembly to be measured.

[0063] Among them, the axial linear power corresponds one-to-one with the target finger sleeve, and the axial linear power also corresponds one-to-one with different heights of the target finger sleeve in the preset axis.

[0064] Specifically, the computer device analyzes and calculates the axial linear powers of the target finger sleeves selected from the second finger sleeve group at the preset height, and obtains the linear power density of the fuel assembly to be measured corresponding to the target finger sleeve.

[0065] In this embodiment, through the data detected by the neutron detector, the linear power density of the fuel assembly to be measured can be calculated, improving the accuracy of the linear power density of the fuel assembly to be measured.

[0066] In some embodiments, determining the linear power density of the fuel assembly to be measured based on the axial linear powers respectively determined for each selected target finger sleeve at the preset height includes: determining the weight corresponding to each selected target finger sleeve; based on the weight corresponding to each selected target finger sleeve, weighting the axial linear powers respectively determined for each selected target finger sleeve at the preset height to obtain the linear power density of the fuel assembly to be measured.

[0067] Specifically, the computer device determines the weight of each finger sleeve around the fuel assembly to be measured. According to the weights corresponding to different finger sleeves, the axial linear powers respectively obtained for each selected target finger sleeve from the second finger sleeve group at the preset height are weighted and calculated, and the linear power density of the fuel assembly to be measured can be obtained.

[0068] In some embodiments, there are multiple finger sleeve groups around the fuel assembly to be measured, and all finger sleeves in each finger sleeve group have the same weight, while the weights of finger sleeves in different finger sleeve groups are different.

[0069] In this embodiment, by determining the weight corresponding to the target finger sleeve, the axial linear power of the target finger sleeve can be calculated based on the determined weight of the target finger sleeve, making the linear power density of the fuel assembly to be measured more accurate.

[0070] In some embodiments, determining the weight corresponding to each selected target finger sleeve includes: for each selected target finger sleeve, determining the weight corresponding to the target finger sleeve according to the distance between the target finger sleeve and the fuel assembly to be measured; wherein, the distance between the target finger sleeve and the fuel assembly to be measured is negatively correlated with the weight corresponding to the target finger sleeve.

[0071] Specifically, the computer device measures the distance between each target finger sleeve and the fuel assembly to be measured. Based on the negative correlation between the distance between the target finger sleeve and the fuel assembly to be measured and the weight corresponding to the target finger sleeve, the weight corresponding to each target finger sleeve can be obtained.

[0072] In this embodiment, by measuring the distance between the target finger sleeve and the fuel assembly to be measured, the weight corresponding to each target finger sleeve can be obtained, making the calculation result of the linear power density of the fuel assembly to be measured more accurate.

[0073] In some embodiments, the method for determining the linear power density of a fuel assembly further includes: when it is determined according to each status signal (where each status signal refers to the status signal of the neutron detector at a preset height of each finger sleeve in the first finger sleeve group obtained above) that at least one neutron detector at the preset height in the first finger sleeve group is in a normal state; selecting at least one effective finger sleeve from the first finger sleeve group as a standard finger sleeve; and determining the linear power density of the fuel assembly to be measured based on the axial linear power determined at the preset height of the standard finger sleeve.

[0074] Among them, the standard finger sleeve belongs to the first finger sleeve group, and the neutron detector at the preset height in the standard finger sleeve is in a normal state.

[0075] Specifically, the computer device uses the probe structure inside the neutron detector to obtain the status signal of the neutron detector, thereby judging the operating status of the neutron detector at the preset height in the first finger sleeve group. When it is determined that there is at least one finger sleeve in the first finger sleeve group where the neutron detector at the preset height is operating normally, multiple finger sleeves are selected from the first finger sleeve group, and the axial linear power corresponding to the selected multiple finger sleeves at the preset height is calculated respectively. And based on the axial linear power corresponding to these selected finger sleeves, the linear power density of the fuel assembly to be measured at the preset height is determined. Among the multiple finger sleeves selected from the first finger sleeve group, at least one finger sleeve has a neutron detector at the preset height operating normally.

[0076] In this embodiment, by judging the status of each finger sleeve in the first finger sleeve group, the linear power density of the fuel assembly to be measured can be obtained based on the data of the first finger sleeve group, improving the calculation efficiency of the linear power density of the fuel assembly to be measured.

[0077] In some embodiments, selecting at least one effective finger sleeve from the first set of finger sleeves as a standard finger sleeve includes: when there are multiple effective finger sleeves in the first set of finger sleeves, selecting a first number of effective finger sleeves from the multiple effective finger sleeves in the first set of finger sleeves as the standard finger sleeve; wherein, the first number is less than or equal to the second number, and the second number is the number of finger sleeves in the nearest set of finger sleeves corresponding to the fuel assembly to be measured; the distance between each finger sleeve in the nearest set of finger sleeves and the fuel assembly to be measured is less than the distance between each finger sleeve in other sets of finger sleeves corresponding to the fuel assembly to be measured and the fuel assembly to be measured.

[0078] Wherein, the first number is the number of finger sleeves selected from the first set of finger sleeves for subsequent linear power density calculation. The second number is the number of finger sleeves in the nearest set of finger sleeves around the fuel assembly to be measured. The nearest set of finger sleeves is the set of finger sleeves with the shortest distance from the finger sleeves included therein to the fuel assembly to be measured among all sets of finger sleeves around the fuel assembly to be measured.

[0079] Specifically, when the computer device determines that there is at least one finger sleeve in the first set of finger sleeves with a neutron detector operating normally at a preset height, it selects a first number of finger sleeves from the finger sleeves operating normally in the first set of finger sleeves.

[0080] In some embodiments, assuming that there are a total of 6 finger sleeves in the nearest set of finger sleeves, that is, the second number is 6, then during the process of calculating the linear power density of the fuel assembly to be measured, 6 finger sleeves can be selected from the first set of finger sleeves, and the data of the 6 finger sleeves in the first set of finger sleeves are used for calculation. The total number of all finger sleeves included in the first set of finger sleeves is greater than 6, and only 6 finger sleeves are selected from the first set of finger sleeves. Among the 6 finger sleeves selected in the first set of finger sleeves, the neutron detectors at the preset height do not necessarily all operate normally, that is, among the 6 finger sleeves selected in the first set of finger sleeves, the number of finger sleeves with neutron detectors operating normally at the preset height is the first number.

[0081] In this embodiment, by selecting a preset number of finger sleeves from the first set of finger sleeves, the linear power density can be calculated using the data of the selected finger sleeves, thereby ensuring the accuracy of the linear power density calculation of the fuel assembly to be measured.

[0082] In some embodiments, such as Figure 4As shown, a partial schematic diagram of the fuel assembly to be measured and the finger sleeves around it is presented from a top-down perspective. The numbers 1 - 7 in the figure represent different rows respectively, and the letters R, P, N, M, L, K, J, H represent different columns respectively. The letters A, B, C, and D represent a type of finger sleeve respectively, and the same letter among A, B, C, and D represents the same type of finger sleeve. The shaded part at the 4th row and the Lth column in the figure represents the fuel assembly to be measured. The finger sleeve A at the 3rd row and the Mth column, the finger sleeve B at the 3rd row and the Kth column, the finger sleeve C at the 5th row and the Mth column, and the finger sleeve D at the 5th row and the Kth column form the finger sleeve group of the first level. The finger sleeve group of the first level refers to the finger sleeve group closest to the fuel assembly to be measured. The finger sleeve A at the 1st row and the Kth column, the finger sleeve D at the 5th row and the Pth column, the finger sleeve A at the 5th row and the Hth column, the finger sleeve B at the 7th row and the Mth column, the finger sleeve C at the 7th row and the Kth column, and the finger sleeve B at the 3rd row and the Hth column form the finger sleeve group of the second level. The finger sleeve group of the second level refers to the finger sleeve group that is the second closest to the fuel assembly to be measured except for the finger sleeve group of the first level. When at least one of the neutron detectors at the preset height of the finger sleeves A, B, C, and D in the finger sleeve group of the first level is normal, the linear power density of the fuel assembly to be measured can be obtained by weighted averaging the finger sleeves A, B, C, and D in the finger sleeve group of the first level through the weight coefficient method. When all the neutron detectors at the preset height of the finger sleeves A, B, C, and D in the finger sleeve group of the first level are abnormal, it can be considered to obtain the value by weighted averaging the finger sleeves A, B, C, and D in the finger sleeve group of the second level through the weight coefficient method.

[0083] Assume that the number of the fuel assembly to be measured is k, and there are m finger sleeves in the innermost circle around the fuel assembly to be measured. The numbers of the finger sleeves are set as a1, a2, …, a m Each of the finger sleeves in the innermost circle is arranged with n neutron detectors in the axial height direction, and the corresponding positions of the neutron detectors in the axial height direction are z1, z2, …, z n In the case where the preset height is z i , when the status signals of all the neutron detectors of all the finger sleeves in the innermost circle at the axial height z i are abnormal signals, select the finger sleeves in the second innermost circle around the fuel assembly k to be measured. The second innermost circle includes r (r ≥ m) finger sleeves, and the numbers of the finger sleeves are set as b1, b2, …, b m , …, b r . Select the finger sleeve b j (1 ≤ j ≤ r) from the second finger sleeve group. Assume that the linear power density of the fuel assembly k to be measured at the axial height z i is P k (i), and the reconstructed axial linear power of the finger sleeve b j at the height z i is P k(b j , i), represented by ω(k, b j ) to denote the weight of the thimble tube b j in the calculation of the linear power density of the fuel assembly k to be measured. Define the status signal of the neutron detector at the axial height z j (1 ≤ i ≤ n) of the thimble tube b i as s(b j , i). Therefore, the linear power density of the fuel assembly k to be measured at the preset height z i can be expressed as:

[0084]

[0085] It should be understood that although the steps in the flowcharts involved in the above-described embodiments are shown in sequence according to the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless otherwise clearly stated in this article, there is no strict order restriction for the execution of these steps, and these steps can be executed in other orders. Moreover, at least a part of the steps in the flowcharts involved in the above-described embodiments may include multiple steps or multiple stages. 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 sequential, but can be executed alternately or alternately with at least a part of other steps or steps or stages in other steps.

[0086] Based on the same inventive concept, an embodiment of the present application also provides a fuel assembly linear power density determination device for implementing the fuel assembly linear power density determination method described above. The solution provided by this device to solve the problem is similar to the solution described in the above method. Therefore, the specific limitations in one or more embodiments of the fuel assembly linear power density determination device provided below can refer to the limitations on the fuel assembly linear power density determination method in the above text, and will not be repeated here.

[0087] In an exemplary embodiment, as Figure 5 shown, a fuel assembly linear power density determination device is provided, including: a signal acquisition module 502, a first selection module 504, a second selection module 506, and a linear power density determination module 508, where:

[0088] The signal acquisition module 502 is configured to acquire the status signals of the neutron detectors of each thimble tube in the first thimble tube group corresponding to the fuel assembly to be measured at the preset height; centered on the fuel assembly to be measured, there are multiple thimble tube groups corresponding to it around the fuel assembly to be measured, and each thimble tube group includes multiple thimble tubes;

[0089] The first selection module 504 is configured to determine a second finger sleeve group corresponding to the fuel assembly to be measured when it is determined according to each status signal that the neutron detectors at a preset height in each finger sleeve of the first finger sleeve group are all abnormal; the distance between each finger sleeve in the second finger sleeve group and the fuel assembly to be measured is greater than the distance between each finger sleeve in the first finger sleeve group and the fuel assembly to be measured;

[0090] The second selection module 506 is configured to select at least one effective finger sleeve from the second finger sleeve group as the target finger sleeve; the neutron detector at the preset height in the effective finger sleeve is in a normal state;

[0091] The linear power density determination module 508 is configured to determine the linear power density of the fuel assembly to be measured based on the data detected by the neutron detector at the preset height in the target finger sleeve.

[0092] In some embodiments, the linear power density determination module is further configured to, for each selected target finger sleeve, obtain the axial linear power determined at the preset height of the target finger sleeve based on the data detected by the neutron detector at the preset height in the target finger sleeve; and determine the linear power density of the fuel assembly to be measured based on the axial linear powers respectively determined at the preset height of the selected target finger sleeves.

[0093] In some embodiments, the linear power density determination module is further configured to determine the weight corresponding to each selected target finger sleeve; and weight the axial linear powers respectively determined at the preset height of the selected target finger sleeves based on the weights corresponding to the selected target finger sleeves respectively, to obtain the linear power density of the fuel assembly to be measured.

[0094] In some embodiments, the linear power density determination module is further configured to, for each selected target finger sleeve, determine the weight corresponding to the target finger sleeve according to the distance between the target finger sleeve and the fuel assembly to be measured; wherein, the distance between the target finger sleeve and the fuel assembly to be measured is negatively correlated with the weight corresponding to the target finger sleeve.

[0095] In some embodiments, the apparatus further includes a linear power density determination module, configured to, when it is determined according to each status signal that the neutron detector at the preset height in at least one finger sleeve of the first finger sleeve group is in a normal state, select at least one effective finger sleeve from the first finger sleeve group as the standard finger sleeve; and determine the linear power density of the fuel assembly to be measured based on the axial linear power determined at the preset height of the characteristic finger sleeve.

[0096] In some embodiments, the linear power density determination module is further configured to, when there are multiple effective finger sleeves in the first set of finger sleeves, select a first number of effective finger sleeves from the multiple effective finger sleeves in the first set of finger sleeves as standard finger sleeves; wherein the first number is less than or equal to the second number, and the second number is the number of finger sleeves in the nearest set of finger sleeves corresponding to the fuel assembly to be measured; the distance between each finger sleeve in the nearest set of finger sleeves and the fuel assembly to be measured is less than the distance between each finger sleeve in other sets of finger sleeves corresponding to the fuel assembly to be measured and the fuel assembly to be measured.

[0097] Each module in the above fuel assembly linear power density determination device can be implemented in whole or in part by software, hardware, and their combination. Each of the above modules can be embedded in the processor of the computer device in hardware form or be independent of it, or can be stored in the memory of the computer device in software form, so that the processor can call and execute the operations corresponding to each of the above modules.

[0098] In an exemplary embodiment, a computer device is provided. The computer device can be a server, and its internal structure diagram can be as Figure 6 shown. The computer device includes a processor, a memory, an input / output interface (Input / Output, abbreviated as I / O), and a communication interface. Among them, the processor, the memory, and the input / output interface are connected through a system bus, and the communication interface is connected to the system bus through the input / output interface. Among them, the processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an 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 operation of the operating system and the computer program in the non-volatile storage medium. The database of the computer device is used to store session data. The input / output 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 an external terminal through a network connection. When the computer program is executed by the processor, it implements a method for determining the linear power density of a fuel assembly.

[0099] In an exemplary embodiment, a computer device is provided. The computer device can be a terminal, and its internal structure diagram can be as Figure 7As shown. The computer device includes a processor, a memory, an input / output interface, a communication interface, a display unit, and an input device. Among them, the processor, the memory, and the input / output interface are connected through a system bus, and the communication interface, the display unit, and the input device are connected to the system bus through the input / output interface. Among them, the processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and computer programs. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage medium. The input / output 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 in a wired or wireless manner, and the wireless manner can be achieved through WIFI, a mobile cellular network, NFC (Near Field Communication), or other technologies. When the computer program is executed by the processor, it implements a method for determining the linear power density of a fuel assembly. The display unit of the computer device is used to form a visually visible picture, which can be a display screen, a projection device, or a virtual reality imaging device. The display screen can be a liquid crystal display screen or an electronic ink display screen. The input device of the computer device can be a touch layer covering the display screen, or a button, a trackball, or a touchpad provided on the housing of the computer device, or an external keyboard, touchpad, or mouse, etc.

[0100] Those skilled in the art can understand that Figure 6 and Figure 7 the structure shown in is only a block diagram of some structures related to the solution of this application, and does not constitute a limitation on the computer device to which the solution of this application is applied. The specific computer device may include more or fewer components than those shown in the figure, or combine some components, or have different component arrangements.

[0101] In an exemplary embodiment, a computer device is provided, including a memory and a processor. A computer program is stored in the memory, and when the processor executes the computer program, the steps in the above method embodiments are implemented.

[0102] In an exemplary embodiment, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by the processor, the steps in the above method embodiments are implemented.

[0103] In an exemplary embodiment, a computer program product is provided, including a computer program. When the computer program is executed by the processor, the steps in the above method embodiments are implemented.

[0104] Those of ordinary skill in the art can understand that all or part of the processes in the methods of the above embodiments can be completed by instructing relevant hardware through a computer program. 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 methods. Among them, any reference to a memory, database, or other medium used in the embodiments provided in the present application can include at least one of non-volatile and volatile memories. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetoresistive random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can 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), etc. The databases involved in the embodiments provided in the present application can include at least one of relational databases and non-relational databases. Non-relational databases can include distributed databases based on blockchain, etc., and are not limited thereto. The processors involved in the embodiments provided in the present application can be general-purpose processors, central processing units, graphics processing units, digital signal processors, programmable logic devices, data processing logics based on quantum computing, etc., and are not limited thereto.

[0105] The technical features of the above embodiments can be combined arbitrarily. For the sake of concise description, 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, it should be considered as the scope described in this specification.

[0106] The above-described embodiments merely represent several implementation manners of the present application. Their descriptions are relatively specific and detailed, but they should not be construed as limiting the patent scope of the present application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the appended claims.

Claims

1. A method for determining the linear power density of a fuel assembly, characterized in that The method includes: Obtaining the status signals of the neutron detectors at a preset height of each finger tube in the first finger tube group corresponding to the fuel assembly to be measured; with the fuel assembly to be measured as the center, there are multiple corresponding finger tube groups around the fuel assembly to be measured, and each finger tube group includes multiple finger tubes; When it is determined according to each of the status signals that the neutron detectors at the preset height in each finger tube in the first finger tube group are all abnormal, determining a second finger tube group corresponding to the fuel assembly to be measured; the distance between each finger tube in the second finger tube group and the fuel assembly to be measured is greater than the distance between each finger tube in the first finger tube group and the fuel assembly to be measured; Selecting at least one effective finger tube from the second finger tube group as the target finger tube; the neutron detector at the preset height in the effective finger tube is in a normal state; Determining the linear power density of the fuel assembly to be measured based on the data detected by the neutron detectors at the preset height in the target finger tube; Wherein, the determining the linear power density of the fuel assembly to be measured based on the data detected by the neutron detectors at the preset height in the target finger tube includes: For each selected target finger tube, obtaining the axial linear power determined at the preset height of the target finger tube based on the data detected by the neutron detector at the preset height in the target finger tube; Determining the linear power density of the fuel assembly to be measured based on the axial linear powers respectively determined at the preset height of each selected target finger tube; Wherein, the obtaining the axial linear power determined at the preset height of the target finger tube based on the data detected by the neutron detector at the preset height in the selected target finger tube includes: detecting the neutron flux density of the target finger tube at the preset height by the neutron detector, obtaining the current corresponding to the target finger tube at the preset height according to the correlation between the neutron flux density and the corresponding current data; calculating the axial linear power of the target finger tube at the preset height based on the positive correlation between the current corresponding to the target finger tube at the preset height and the axial linear power of the target finger tube at the preset height; Among them, determining the linear power density of the fuel assembly to be measured based on the axial linear powers respectively determined at the preset height for each of the selected target finger sleeves includes: determining the weight corresponding to each of the selected target finger sleeves; based on the weights corresponding to each of the selected target finger sleeves, weighting the axial linear powers respectively determined at the preset height for each of the selected target finger sleeves to obtain the linear power density of the fuel assembly to be measured; determining the weight corresponding to each of the selected target finger sleeves includes: for each of the selected target finger sleeves, determining the weight corresponding to the target finger sleeve according to the distance between the target finger sleeve and the fuel assembly to be measured; wherein, the distance between the target finger sleeve and the fuel assembly to be measured is negatively correlated with the weight corresponding to the target finger sleeve.

2. The method according to claim 1, wherein The method further includes: When it is determined according to each of the status signals that the neutron detectors at the preset height in at least one finger sleeve in the first finger sleeve group are in a normal state, selecting at least one of the effective finger sleeves in the first finger sleeve group as a standard finger sleeve; Based on the axial linear power determined at the preset height for the standard finger sleeve, determining the linear power density of the fuel assembly to be measured.

3. The method according to claim 2, wherein The selecting at least one of the effective finger sleeves in the first finger sleeve group as a standard finger sleeve includes: In the case where there are multiple effective finger sleeves in the first finger sleeve group, selecting a first number of the effective finger sleeves from the multiple effective finger sleeves in the first finger sleeve group as the standard finger sleeve; Wherein, the first number is less than or equal to a second number, and the second number is the number of finger sleeves in the nearest finger sleeve group corresponding to the fuel assembly to be measured; the distance between each finger sleeve in the nearest finger sleeve group and the fuel assembly to be measured is less than the distance between each finger sleeve in other finger sleeve groups corresponding to the fuel assembly to be measured.

4. The method according to claim 1, wherein The second finger sleeve group is the nearest effective finger sleeve group to the first finger sleeve group among the effective finger sleeve groups around the fuel assembly to be measured, and the effective finger sleeve group refers to a finger sleeve group in which there is at least one effective finger sleeve.

5. A device for determining the linear power density of a fuel assembly, characterized in that, The device includes: A signal acquisition module, configured to acquire the status signals of the neutron detectors at the preset height for each finger sleeve in the first finger sleeve group corresponding to the fuel assembly to be measured; with the fuel assembly to be measured as the center, there are multiple finger sleeve groups corresponding to it around the fuel assembly to be measured, and each finger sleeve group includes multiple finger sleeves; A first selection module, configured to determine the second finger sleeve group corresponding to the fuel assembly to be measured when it is determined according to each of the status signals that the neutron detectors at the preset height in each finger sleeve in the first finger sleeve group are all abnormal; the distance between each finger sleeve in the second finger sleeve group and the fuel assembly to be measured is greater than the distance between each finger sleeve in the first finger sleeve group and the fuel assembly to be measured; A second selection module, configured to select at least one effective finger sleeve from the second finger sleeve group as a target finger sleeve; the neutron detector at the preset height in the effective finger sleeve is in a normal state; A linear power density determination module, configured to determine the linear power density of the fuel assembly to be measured based on the data detected by the neutron detector at the preset height in the target finger sleeve; Wherein, the linear power density determination module is specifically configured to: for each selected target finger sleeve, obtain the axial linear power determined at the preset height of the target finger sleeve based on the data detected by the neutron detector at the preset height in the target finger sleeve; determine the linear power density of the fuel assembly to be measured based on the axial linear powers respectively determined at the preset height of each selected target finger sleeve; Wherein, when the linear power density determination module executes the operation of obtaining the axial linear power determined at the preset height of the target finger sleeve based on the data detected by the neutron detector at the preset height in the target finger sleeve for each selected target finger sleeve, it is specifically configured to: detect the neutron flux density at the preset height of the target finger sleeve through the neutron detector, and obtain the current corresponding to the target finger sleeve at the preset height according to the correlation between the neutron flux density and the corresponding current data; calculate the axial linear power of the target finger sleeve at the preset height based on the positive correlation between the current corresponding to the target finger sleeve at the preset height and the axial linear power of the target finger sleeve at the preset height; Wherein, when the linear power density determination module executes the operation of determining the linear power density of the fuel assembly to be measured based on the axial linear powers respectively determined at the preset height of each selected target finger sleeve, it is specifically configured to: determine the weight corresponding to each selected target finger sleeve; based on the weights corresponding to each selected target finger sleeve, weight the axial linear powers respectively determined at the preset height of each selected target finger sleeve to obtain the linear power density of the fuel assembly to be measured; when the linear power density determination module executes the operation of determining the weight corresponding to each selected target finger sleeve, it is specifically configured to: for each selected target finger sleeve, determine the weight corresponding to the target finger sleeve according to the distance between the target finger sleeve and the fuel assembly to be measured; wherein, the distance between the target finger sleeve and the fuel assembly to be measured is negatively correlated with the weight corresponding to the target finger sleeve.

6. The device according to claim 5, characterized in that The linear power density determination module is further configured to: when it is determined according to each status signal that the neutron detector at the preset height in at least one finger sleeve in the first finger sleeve group is in a normal state, select at least one effective finger sleeve from the first finger sleeve group as a standard finger sleeve; determine the linear power density of the fuel assembly to be measured based on the axial linear power determined at the preset height of the characteristic finger sleeve.

7. The device according to claim 5, characterized in that The line power density determination module is further configured to: when there are multiple effective finger guide tubes in the first finger guide tube group, select a first number of effective finger guide tubes from the multiple effective finger guide tubes in the first finger guide tube group as standard finger guide tubes; wherein, the first number is less than or equal to the second number, and the second number is the number of finger guide tubes in the nearest finger guide tube group corresponding to the fuel assembly to be measured; the distance between each finger guide tube in the nearest finger guide tube group and the fuel assembly to be measured is less than the distance between each finger guide tube in other finger guide tube groups corresponding to the fuel assembly to be measured and the fuel assembly to be measured.

8. A computer device, comprising a memory and a processor, the memory storing a computer program, characterized in that, When the processor executes the computer program, it implements the steps of the method according to any one of claims 1 to 4.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the steps of the method according to any one of claims 1 to 4.

10. A computer program product comprising a computer program, characterized in that, When the computer program is executed by the processor, it implements the steps of the method according to any one of claims 1 to 4.

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