Liquid level detection method, device, computer equipment and storage medium

Abstract

The present application is about a liquid level detection method, device, computer equipment and storage medium. The liquid level detection method includes: dividing the reactor pressure vessel into multiple detection areas; using two position detectors to respectively record the incident information and the emission information of multiple muons; calculating the detection area and the scattering angle where the muons are scattered according to the incident information and the emission information of the muons; calculating the root mean square value of the scattering angle of the scattering occurring in each detection area; comparing the root mean square value of the scattering angle with the data corresponding to the detection area in the reference sequence to obtain the material properties of the detection area; according to the material properties of the multiple detection areas, the liquid level in the reactor pressure vessel is obtained. Using the liquid level detection method of the present application, the liquid level in the reactor pressure vessel can be non-destructively and non-invasively detected, and the maximum service life, inspection, maintenance and adjustment of the position detector are less affected by the reactor refueling cycle.

Description

Technical Field

[0001] The present application relates to the field of liquid level detection, and in particular to a liquid level detection method, device, computer equipment and storage medium. Background Art

[0002] As a process parameter, the liquid level can reflect the operating status of the nuclear power system. For example, the liquid level in the reactor pressure vessel, the liquid level in the pressurizer, and the liquid level in the steam generator directly reflect the operating status of the nuclear power system. In order to avoid nuclear accidents, all commercial pressurized water reactor nuclear power plants must be equipped with a complete reactor pressure vessel liquid level detection device to detect the liquid level in the reactor pressure vessel in a full range, so as to monitor the flooding of the reactor core in real time under normal operating conditions and loss of coolant accident conditions.

[0003] Installing a liquid level detection device in a nuclear power plant to accurately detect and display the liquid level in the reactor pressure vessel is an important guarantee for reactor operators to control the unit parameters of the nuclear power system under accident conditions and is a necessary measure to ensure the safe production of nuclear power plants.

[0004] At present, the differential pressure method or radar liquid level observation method is usually used to detect the liquid level. However, the use of the differential pressure method to detect the liquid level in the reactor pressure vessel has the following problems: it is necessary to open a hole at the bottom of the reactor pressure vessel to take the pressure, which does not meet the current design concept requirements for pressurized water reactors; it is easily affected by the operating state of the pump and the changes in the reactor plant environment, resulting in a large uncertainty in detection; it is necessary to set up three types of transmitters, wide range, narrow range and reference range, which are complicated to arrange, the pressure-taking pipeline is long, the transmitter structure is complex, and there are many electronic components. It is easily affected by radiation and temperature under accident conditions, and it is difficult to meet the detection needs under severe accident conditions. The use of the radar liquid level observation method has the problem that the special radioactive environment in the reactor affects the radar and cannot work normally. Summary of the invention

[0005] In order to overcome the problems existing in the related art, the present application provides a liquid level detection method, device, computer equipment and storage medium.

[0006] According to a first aspect of an embodiment of the present application, a liquid level detection method is provided, which is used to detect the liquid level in a reactor pressure vessel of a nuclear power plant, wherein the reactor pressure vessel is arranged between a first position detector and a second position detector, the first position detector and the second position detector are plate-shaped, and the first position detector and the second position detector are arranged opposite to each other, and the liquid level detection method comprises:

[0007] Dividing the reactor pressure vessel into a plurality of detection areas, wherein the plurality of detection areas have the same size in a first direction, the first direction being an arrangement direction of the first position detector, the reactor pressure vessel and the second position detector;

[0008] Using the first position detector to record the incident information of a plurality of muons, and using the second position detector to record the exit information of the plurality of muons, wherein each muon of the plurality of muons sequentially passes through the first position detector, the reactor pressure vessel, and the second position detector, the incident information of the muon is the incident position and the incident direction of the muon into the reactor pressure vessel, and the exit information of the muon is the exit position and the exit direction of the muon from the reactor pressure vessel;

[0009] According to the incident information of the muon and the emission information of the muon, a detection area where the muon is scattered and a scattering angle at which the muon is scattered are obtained;

[0010] calculating a root mean square value of a scattering angle of scattering occurring in each of the plurality of detection areas;

[0011] Comparing the root mean square value of the scattering angle with data corresponding to the detection area in a reference sequence to obtain material properties of the detection area, wherein the reference sequence includes reference root mean square values ​​of scattering angles of muons scattered at different positions in different material scenarios;

[0012] The liquid level is derived according to the material properties of the plurality of detection areas.

[0013] In some exemplary embodiments of the present application, the liquid level detection method further includes:

[0014] The reference sequence is established.

[0015] In some exemplary embodiments of the present application, establishing the reference sequence comprises:

[0016] Establishing a plurality of sample models, wherein the material scenes of the plurality of sample models are different and the sizes of the plurality of sample models are the same as the size of the reactor pressure vessel;

[0017] Divide each of the plurality of sample models into a plurality of layers along the first direction, wherein each layer has the same size as the detection area along the first direction;

[0018] Simulating a process in which a plurality of muons pass through the sample model, and calculating a root mean square value of a reference scattering angle of each layer;

[0019] A set of reference scattering angle root mean square values ​​of multiple layers of the multiple sample models is used as the reference sequence.

[0020] In some exemplary embodiments of the present application, the material scenarios of the multiple sample models include three material scenarios: steel, steel and water, and steel and uranium dioxide.

[0021] In some exemplary embodiments of the present application, comparing the root mean square value of the scattering angle with data corresponding to the detection area in a reference sequence to obtain the material property of the detection area includes:

[0022] Calculate the grey correlation degree of the root mean square value of the scattering angle and the root mean square values ​​of multiple reference scattering angles in the reference sequence corresponding to the layer where the detection area is located;

[0023] The material of the layer where the detection area is located in the sample model corresponding to the reference scattering angle root mean square value with the largest grey correlation degree is used as the material attribute.

[0024] In some exemplary embodiments of the present application, the step of obtaining the detection area where the muon is scattered and the scattering angle at which the muon is scattered according to the incident information of the muon and the emission information of the muon includes:

[0025] Determining the incident path of the muon according to the incident position and the incident direction;

[0026] Determining the emission path of the muon according to the emission position and the emission direction;

[0027] The midpoint of the line connecting the two closest points on the incident path and the outgoing path is taken as an ideal scattering point, and the detection area where the ideal scattering point is located is taken as the detection area where the muon scattering occurs;

[0028] The included angle between the incident path and the outgoing path is taken as the scattering angle.

[0029] In some exemplary embodiments of the present application, the step of obtaining the liquid level according to the material properties of the plurality of detection areas includes:

[0030] Determining material distribution in the reactor pressure vessel according to material properties of the multiple detection areas;

[0031] The liquid level is obtained according to the material distribution.

[0032] According to a second aspect of an embodiment of the present application, a liquid level detection device is provided, which is used to detect the liquid level in a reactor pressure vessel of a nuclear power plant, wherein the reactor pressure vessel is arranged between a first position detector and a second position detector, the first position detector and the second position detector are plate-shaped, and the first position detector and the second position detector are arranged opposite to each other, and the liquid level detection device comprises:

[0033] a detection area division module, configured to divide the reactor pressure vessel into a plurality of detection areas, wherein the plurality of detection areas have the same size in a first direction, the first direction being an arrangement direction of the first position detector, the reactor pressure vessel and the second position detector;

[0034] an incident information and an exit information recording module, configured to use the first position detector to record the incident information of a plurality of muons, and use the second position detector to record the exit information of the plurality of muons, wherein each muon of the plurality of muons sequentially passes through the first position detector, the reactor pressure vessel and the second position detector, the incident information of the muon is the incident position and the incident direction of the muon incident on the reactor pressure vessel, and the exit information of the muon is the exit position and the exit direction of the muon emitted from the reactor pressure vessel;

[0035] A first calculation module is configured to obtain a detection area where the muon is scattered and a scattering angle at which the muon is scattered according to the incident information of the muon and the emission information of the muon;

[0036] A second calculation module is configured to calculate a root mean square value of a scattering angle of scattering occurring in each of the plurality of detection areas;

[0037] A third calculation module is configured to compare the root mean square value of the scattering angle with data corresponding to the detection area in a reference sequence to obtain a material property of the detection area, wherein the reference sequence includes reference root mean square values ​​of scattering angles of muons scattered at different positions in different material scenarios;

[0038] The liquid level determination module is configured to obtain the liquid level according to the material properties of the multiple detection areas.

[0039] In some exemplary embodiments of the present application, the liquid level detection device further includes:

[0040] The reference sequence establishing module is configured to establish the reference sequence.

[0041] In some exemplary embodiments of the present application, the reference sequence establishing module is further configured to:

[0042] Establishing a plurality of sample models, wherein the material scenes of the plurality of sample models are different and the sizes of the plurality of sample models are the same as the size of the reactor pressure vessel;

[0043] Divide each of the plurality of sample models into a plurality of layers along the first direction, wherein each layer has the same size as the detection area along the first direction;

[0044] Simulating a process in which a plurality of muons pass through the sample model, and calculating a root mean square value of a reference scattering angle of each layer;

[0045] A set of reference scattering angle root mean square values ​​of multiple layers of the multiple sample models is used as the reference sequence.

[0046] In some exemplary embodiments of the present application, the material scenarios of the multiple sample models include three material scenarios: steel, steel and water, and steel and uranium dioxide.

[0047] In some exemplary embodiments of the present application, the third calculation module is further configured to:

[0048] Calculate the grey correlation degree of the root mean square value of the scattering angle and the root mean square values ​​of multiple reference scattering angles in the reference sequence corresponding to the layer where the detection area is located;

[0049] The material of the layer where the detection area is located in the sample model corresponding to the reference scattering angle root mean square value with the largest grey correlation degree is used as the material attribute.

[0050] In some exemplary embodiments of the present application, the first computing module is further configured to:

[0051] Determining the incident path of the muon according to the incident position and the incident direction;

[0052] Determining the emission path of the muon according to the emission position and the emission direction;

[0053] The midpoint of the line connecting the two closest points on the incident path and the outgoing path is taken as an ideal scattering point, and the detection area where the ideal scattering point is located is taken as the detection area where the muon scattering occurs;

[0054] The included angle between the incident path and the outgoing path is taken as the scattering angle.

[0055] In some exemplary embodiments of the present application, the liquid level determination module is further configured to:

[0056] Determining material distribution in the reactor pressure vessel according to material properties of the multiple detection areas;

[0057] The liquid level is obtained according to the material distribution.

[0058] According to a third aspect of an embodiment of the present application, a computer device is provided, including a memory and a processor, wherein the memory stores a computer program, and when the processor executes the computer program, the steps of the method described in the first aspect are implemented.

[0059] According to a fourth aspect of an embodiment of the present application, a non-temporary computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the steps of the method described in the first aspect are implemented.

[0060] The technical solution provided by the embodiments of the present application may include the following beneficial effects: using the liquid level detection method of the present application, the liquid level in the reactor pressure vessel can be non-destructively and non-invasively detected, and the first position detector and the second position detector are installed outside the reactor pressure vessel, so that the maximum service life, inspection, maintenance and adjustment of the position detectors are less affected by the reactor refueling cycle.

[0061] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0062] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0063] Figure 1 It is a schematic diagram of a first position detector, a reactor pressure vessel and a second position detector arranged in a horizontal direction.

[0064] Figure 2 It is a schematic diagram showing that a first position detector, a reactor pressure vessel and a second position detector are arranged in a vertical direction.

[0065] Figure 3 It is a flow chart of a liquid level detection method shown according to an exemplary embodiment of the present application.

[0066] Figure 4 According to the exemplary embodiment of the present application Figure 3 Flowchart of step S303 in FIG.

[0067] Figure 5 According to the exemplary embodiment of the present application Figure 3 Flowchart of step S306 in FIG.

[0068] Figure 6It is a flow chart of a liquid level detection method shown according to an exemplary embodiment of the present application.

[0069] Figure 7 According to the exemplary embodiment of the present application Figure 3 Flowchart of step S305 in FIG.

[0070] Figure 8 It is a flow chart of a liquid level detection method shown according to an exemplary embodiment of the present application.

[0071] Fig. 9 It is a block diagram of a liquid level detection device shown according to an exemplary embodiment of the present application.

[0072] Fig.10 It is a block diagram of a computer device according to an exemplary embodiment of the present application. DETAILED DESCRIPTION

[0073] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Instead, they are merely examples of devices and methods consistent with some aspects of the present invention as detailed in the appended claims.

[0074] Installing a liquid level detection device in a reactor pressure vessel in a nuclear power plant to accurately detect and display the liquid level in the reactor pressure vessel is an important guarantee for the reactor operator to control the unit parameters of the nuclear power system under accident conditions, and is a necessary measure to ensure the safe production of nuclear power plants. At present, the differential pressure method or radar liquid level observation method is usually used to detect the liquid level. However, the use of the differential pressure method to detect the liquid level in the reactor pressure vessel has the following problems: it is necessary to open a hole at the bottom of the reactor pressure vessel to take the pressure, which does not meet the current design concept requirements for pressurized water reactors; it is easily affected by the operating state of the pump and the changes in the reactor plant environment, resulting in a large uncertainty in detection; it is necessary to set up three types of transmitters with a wide range, a narrow range, and a reference range, which are complicated to arrange, the pressure-taking pipeline is long, the transmitter structure is complex, and there are many electronic components. It is easily affected by radiation and temperature under accident conditions, and it is difficult to meet the detection needs under severe accident conditions. The use of the radar liquid level observation method has the problem that the radar is affected by the special radioactive environment in the reactor and cannot work normally.

[0075] In order to solve the above technical problems, the present application provides a liquid level detection method, device, computer equipment and storage medium. The reactor pressure vessel is arranged between a first position detector and a second position detector, the first position detector and the second position detector are plate-shaped, and the first position detector and the second position detector are arranged opposite to each other. The reactor pressure vessel is divided into a plurality of detection areas, wherein the plurality of detection areas have the same size in the first direction, and the first direction is the arrangement direction of the first position detector, the reactor pressure vessel and the second position detector. The first position detector is used to record the incident information of a plurality of muons, and the second position detector is used to record the emission information of a plurality of muons, wherein each muon of the plurality of muons passes through the first position detector, the reactor pressure vessel and the second position detector in sequence, the incident information of the muon is the incident position and the incident direction of the muon incident on the reactor pressure vessel, and the emission information of the muon is the emission position and the emission direction of the muon emitted from the reactor pressure vessel. According to the incident information of the muon and the emission information of the muon, the detection area where the muon scatters and the scattering angle of the muon scattering are obtained. The root mean square value of the scattering angle of the scattering occurring in each detection area in the plurality of detection areas is calculated. The root mean square value of the scattering angle is compared with the data corresponding to the detection area in the reference sequence to obtain the material properties of the detection area, wherein the reference sequence includes the reference root mean square value of the scattering angle of muons scattered at different positions in different material scenarios. According to the material properties of multiple detection areas, the liquid level in the reactor pressure vessel of the nuclear power plant is obtained. Non-destructive and non-invasive detection of the liquid level in the reactor pressure vessel is achieved, and the first position detector and the second position detector are installed outside the reactor pressure vessel, so that the maximum service life, inspection, maintenance and adjustment of the position detectors are less affected by the reactor refueling cycle.

[0076] The exemplary embodiment of the present application provides a liquid level detection method for detecting the liquid level in a reactor pressure vessel of a nuclear power plant, wherein the reactor pressure vessel is arranged between a first position detector and a second position detector, the first position detector and the second position detector are plate-shaped, and the first position detector and the second position detector are arranged opposite to each other. Figure 1 As shown in the figure, the first position detector, the reactor pressure vessel and the second position detector are arranged in the horizontal direction, and the reactor pressure vessel is located between the first position detector and the second position detector. Taking the orientation shown in the figure as a reference, the muon is incident from the left side, passes through the first position detector, the reactor pressure vessel and the second position detector in sequence, and then is emitted from the right side. Figure 2As shown, the first position detector, the reactor pressure vessel and the second position detector are arranged in the vertical direction, the reactor pressure vessel is located between the first position detector and the second position detector, and with the orientation shown in the figure as a reference, the muon is incident from above, passes through the first position detector, the reactor pressure vessel and the second position detector in sequence, and then is emitted from below. Of course, it can be understood that the plate-shaped first position detector and the second position detector can also be arranged tilted relative to the reactor pressure vessel, as long as the first position detector and the second position detector are arranged relative to each other.

[0077] by Figure 1 and Figure 2 Taking the two arrangements shown in FIG. 1 as an example, the liquid level detection method in this application is described. Figure 3 As shown, the liquid level detection method shown in this exemplary embodiment includes:

[0078] S301. Divide the reactor pressure vessel into a plurality of detection areas, wherein the plurality of detection areas have the same size in a first direction, and the first direction is an arrangement direction of the first position detector, the reactor pressure vessel, and the second position detector.

[0079] The reactor pressure vessel is a closed container that houses a nuclear reactor and withstands its huge operating pressure. In step S301, the reactor pressure vessel to be inspected is divided into multiple inspection areas, and the multiple inspection areas have the same size in the arrangement direction of the first position detector, the reactor pressure vessel, and the second position detector. For example, Figure 1 As shown, the first position detector, the reactor pressure vessel, and the second position detector are arranged in the horizontal direction, and the reactor pressure vessel to be detected is divided into a plurality of detection areas with the same size in the horizontal direction. The reactor pressure vessel can be first divided into a plurality of layers with the same size in the horizontal direction, and then each layer is divided into a plurality of detection areas with the same size as the layer in the horizontal direction. For another example, Figure 2 As shown, the first position detector, the reactor pressure vessel and the second position detector are arranged in the vertical direction, and the reactor pressure vessel to be inspected is divided into a plurality of inspection areas of the same size in the vertical direction. The reactor pressure vessel can be first divided into a plurality of layers of the same size in the vertical direction, and then each layer can be divided into a plurality of inspection areas of the same size as the layer in the vertical direction.

[0080] S302. Use a first position detector to record the incident information of multiple muons, and use a second position detector to record the exit information of multiple muons, wherein each muon of the multiple muons passes through the first position detector, the reactor pressure vessel, and the second position detector in sequence, the incident information of the muon is the incident position and incident direction of the muon into the reactor pressure vessel, and the exit information of the muon is the exit position and exit direction of the muon from the reactor pressure vessel.

[0081] Muons are one of the fundamental particles in nature, mainly derived from cosmic rays. They have extremely strong penetrating power and can achieve non-contact, deep penetration and non-destructive imaging of large targets. Using muons in nature to detect the liquid level in the reactor pressure vessel does not require the installation of an additional muon generator, and no additional radiation will be generated due to the installation of a generator. The detection method is more stable and reliable, and can save costs. It only needs to ensure a certain detection time to obtain relatively accurate detection results.

[0082] The first position detector and the second position detector may be position detectors based on plastic scintillators. Plastic scintillators are solid solutions of organic scintillating materials in plastics, usually composed of matrix scintillating materials and wave shifters, and can be used to detect α, β, γ, fast neutrons, protons, cosmic rays, fission fragments, etc. The first position detector and the second position detector may also be any other position detectors that can be used to detect muons.

[0083] In step S302, multiple muons in nature pass through the first position detector, the reactor pressure vessel and the second position detector in sequence. The first position detector is used to record the incident position and incident direction of each muon into the reactor pressure vessel, and the second position detector is used to record the exit position and exit direction of each muon emitted from the reactor pressure vessel for use in subsequent steps.

[0084] S303, obtaining a detection area where the muon scattering occurs and a scattering angle at which the muon scatters according to the incident information of the muon and the emission information of the muon.

[0085] Muon scattering means that when a muon passes through matter, it collides with the atomic nuclei in the matter, causing the direction of the muon's movement to deviate from its original direction of movement.

[0086] In step S303, the detection area to which the position where the muon is scattered belongs and the scattering angle are calculated according to the incident information and the emission information of the muon.

[0087] In the exemplary embodiment of the present application, Figure 4 As shown, step S303 specifically includes:

[0088] S303-1. Determine the incident path of the muon based on the incident position and incident direction.

[0089] S303-2. Determine the emission path of the muon based on the emission position and emission direction.

[0090] S303-3. The midpoint of the line connecting the two closest points on the incident path and the outgoing path is taken as the ideal scattering point, and the detection area where the ideal scattering point is located is taken as the detection area where the muon scattering occurs.

[0091] S303-4. The angle between the incident path and the outgoing path is taken as the scattering angle.

[0092] In steps S303-1 to S303-4, the incident path of the muon is obtained according to the incident position and the incident direction of the muon recorded by the first position detector, and the exit path of the muon is obtained according to the exit position and the exit direction of the muon recorded by the second position detector. The two closest points (i.e., two positions) on the incident path and the exit path are found, and the midpoint of the line connecting the two points is taken as the ideal scattering point where scattering occurs, the detection area where the ideal scattering point is located is taken as the detection area where the scattering occurs, and the angle between the incident path and the exit path is taken as the scattering angle.

[0093] The POCA (Point of Closest Approach) algorithm is an algorithm used to calculate particle trajectories. For example, the POCA algorithm can be used to simulate the incident path of a muon based on the incident position and incident direction of the muon, and to simulate the exit path of a muon based on the exit position and exit direction of the muon, find the two closest points on the incident path and the exit path, and use the midpoint of the line connecting the two points as the ideal scattering point for this scattering, and at the same time solve the angle between the incident path and the exit path as the scattering angle for this scattering.

[0094] Any other feasible method may also be used to calculate the incident path, the outgoing path, the ideal scattering point and the angle between the incident path and the outgoing path of the muon.

[0095] S304, calculating the root mean square value of the scattering angle of scattering occurring in each of the multiple detection areas.

[0096] The RMS value of the scattering angle is a statistic used to measure the dispersion of the scattering angle distribution. It is calculated by summing the squares of each scattering angle and then taking the square root of the average. In fields such as physics, material science, and optics, the RMS value of the scattering angle is often used to characterize the scattering behavior of particles, light, or waves in a medium.

[0097] The detection area and scattering angle of the ideal scattering point where each muon is scattered can be recorded. After observing multiple muons, the squares of the scattering angles that occur in the same detection area of ​​the reactor pressure vessel are summed, and then the square root of the average value is taken to obtain the root mean square value of the scattering angle corresponding to this detection area. Using the same method, the root mean square value of a scattering angle corresponding to each detection area is obtained.

[0098] S305. Compare the root mean square value of the scattering angle with the data corresponding to the detection area in the reference sequence to obtain the material properties of the detection area, wherein the reference sequence includes the root mean square values ​​of the reference scattering angles of muons scattered at different positions in different material scenarios.

[0099] The reference sequence may be a set of reference scattering angle root mean square values ​​of muons scattered at different positions under different material scenarios. The material scenarios may include three material scenarios: steel, steel and water, and steel and uranium dioxide, wherein steel is the material of the reactor pressure vessel wall, water is the material of the coolant, and uranium dioxide is the material of the reactor core.

[0100] The root mean square value of the scattering angle of the detection area obtained by the actual detection method is compared with the corresponding multiple reference root mean square values ​​of the scattering angle in the reference sequence, wherein each reference root mean square value of the scattering angle is the reference root mean square value of the scattering angle of the layer in the detection area stored in the reference sequence in a material scene. By comparing the root mean square value of the scattering angle of the detection area obtained by the actual detection with the corresponding multiple reference root mean square values ​​of the scattering angle, the material of the layer in the detection area in the material scene corresponding to the reference root mean square value of the scattering angle of the detection area obtained by the actual detection method is used as the material property of the detection area. Using the same method, the material property of each detection area is obtained.

[0101] For example, in the reference sequence, for the position corresponding to a detection area, there are three reference scattering angle root mean square values ​​corresponding to three material scenarios: steel, steel and water, and steel and uranium dioxide. The root mean square value of the scattering angle of this detection area is compared with the three reference scattering angle root mean square values ​​in the reference sequence, and it is found that the reference scattering angle root mean square value corresponding to the steel and uranium dioxide material scenario is closest to the root mean square value of the scattering angle of this detection area. Steel is the material of the reactor pressure vessel wall. The steel and uranium dioxide material scenario refers to the reactor pressure vessel wall made of steel being filled with uranium dioxide. In the steel and uranium dioxide material scenario, the material of the layer where this detection area is located is uranium dioxide, so it is concluded that the material property of this detection area is uranium dioxide.

[0102] S306: Determine the liquid level according to the material properties of the multiple detection areas.

[0103] In the exemplary embodiment of the present application, Figure 5 As shown, step S306 specifically includes:

[0104] S306-1. Determine the material distribution in the reactor pressure vessel based on the material properties of the multiple detection areas.

[0105] The material distribution in the reactor pressure vessel refers to the material properties of each position in the reactor pressure vessel. In step S301, the reactor pressure vessel is divided into a plurality of small detection areas, each of which can represent a position in the reactor pressure vessel. By determining the material properties of each detection area, the material properties of each position in the reactor pressure vessel can be obtained. Therefore, the material distribution in the reactor pressure vessel can be obtained based on the material properties of all the detection areas in the plurality of detection areas.

[0106] For example, among the multiple detection areas in each layer, if the material property of some detection areas is water, then it can be concluded that the material property of the location of the detection area in the reactor pressure vessel is water, and if the material property of some detection areas is uranium dioxide, then it can be concluded that the material property of the location of the detection area in the reactor pressure vessel is uranium dioxide. Based on the material properties of all detection areas, it can be concluded which locations in the reactor pressure vessel have the material property of water and which locations have the material property of uranium dioxide.

[0107] S306-2. Determine the liquid level based on the material distribution.

[0108] According to the material properties of each position in the reactor pressure vessel, the highest position where the material properties are liquid can be obtained, and this highest position is taken as the liquid level in the reactor pressure vessel.

[0109] For example, the liquid is water, which is used as a coolant in the reactor pressure vessel to remove the heat released during the reaction of the reactor core, and the fuel is solid uranium dioxide. In the reactor pressure vessel, the material properties of some locations are water, and the material properties of some locations are uranium dioxide. According to the material properties of each location in the reactor pressure vessel, it can be concluded that the highest location with the material property of water is used, and this highest location is used as the liquid level in the reactor pressure vessel.

[0110] In this exemplary embodiment, the root mean square value of the scattering angle of the muons in each detection area in the reactor pressure vessel is observed and calculated, and compared with a reference sequence to obtain the liquid level in the reactor pressure vessel, thereby achieving non-destructive and non-invasive detection of the liquid level in the reactor pressure vessel, and the first position detector and the second position detector are installed outside the reactor pressure vessel, so that the maximum service life, inspection, maintenance and adjustment of the position detectors are less affected by the reactor refueling cycle.

[0111] The exemplary embodiment of the present application provides a method for detecting a liquid level, the method comprising: Figure 3 The method shown in the figure also includes: establishing a reference sequence. Figure 6 As shown, establish a reference sequence, specifically including:

[0112] S601. Establish multiple sample models, wherein the material scenarios of the multiple sample models are different, and the sizes of the multiple sample models are the same as the size of the reactor pressure vessel.

[0113] In step S601, a plurality of sample models having the same size as that of the reactor pressure vessel but different material scenarios are established.

[0114] For example, the multiple sample models include three sample models, the sizes of the three sample models are the same as the size of the reactor pressure vessel, and the material scenarios of the multiple sample models include three material scenarios: steel, steel and water, and steel and uranium dioxide. Among them, steel is the material of the reactor pressure vessel wall, water is the material of the coolant, and uranium dioxide is the material of the reactor core. The three sample models established represent the scenarios of the reactor pressure vessel wall, the reactor pressure vessel wall and the reactor pressure vessel wall filled with coolant, and the reactor pressure vessel wall and the reactor pressure vessel wall filled with the reactor core.

[0115] S602 . Divide each sample model of the multiple sample models into multiple layers along a first direction, wherein each layer has the same size as the detection area along the first direction.

[0116] The degree of scattering is related to the density and thickness of the material that the muon passes through. Therefore, in addition to setting different material scenarios, different thicknesses need to be considered. In step S602, each sample model is divided into multiple layers along the arrangement direction of the first position detector, the reactor pressure vessel, and the second position detector. In order to make the reference sequence finally established be used for comparison with the root mean square value of the scattering angle, the size of each layer in the arrangement direction of the first position detector, the reactor pressure vessel, and the second position detector is the same as the size of the detection area in this arrangement direction.

[0117] S603, simulating the process of multiple muons passing through the sample model, and calculating the root mean square value of the reference scattering angle of each layer.

[0118] In step S603, for each sample model, the process of a muon passing through the sample model is simulated, and the layer and scattering angle at which the muon is scattered are obtained according to the incident path and the outgoing path of the muon. After simulating the process of multiple muons passing through the sample model, the root mean square value of the scattering angles scattered in each layer is calculated, and the calculated root mean square value of the scattering angle of the layer is used as the reference root mean square value of the scattering angle of the layer in the sample model.

[0119] S604: Take a set of reference scattering angle root mean square values ​​of multiple layers of multiple sample models as a reference sequence.

[0120] In step S604, the set of reference scattering angle root mean square values ​​of all layers in all sample models is used as a reference sequence. For example, three sample models are established, each sample model is divided into 50 layers, and the reference sequence includes 150 reference scattering angle root mean square values.

[0121] The above steps S601 to S604 of establishing the reference sequence may be performed by a geometry and tracking method (Geometry And Tracking), or may be performed by other methods, which are not limited here.

[0122] In this exemplary embodiment, Figure 7 As shown, step S305 specifically includes:

[0123] S305-1. Calculate the grey correlation degree of the root mean square value of the scattering angle and the root mean square values ​​of multiple reference scattering angles corresponding to the layer where the same detection area is located in the reference sequence.

[0124] In step S305 - 1 , the gray correlation degree can be calculated by using the following formula to calculate the root mean square value of the scattering angle and multiple reference root mean square values ​​of the scattering angles corresponding to the layer where the same detection area is located in the reference sequence.

[0125]

[0126]

[0127]

[0128] in, is the RMS value of the scattering angle, is the reference scattering angle RMS value, where is the serial number of the sample model, is the number of sample models, is the absolute value of the difference between the RMS value of the scattering angle and the RMS value of the reference scattering angle, is the maximum absolute value of the difference between the root mean square value of the scattering angle and the root mean square value of the reference scattering angle, is the minimum value of the absolute value of the difference between the root mean square value of the scattering angle and the root mean square value of the reference scattering angle, is the discrimination coefficient, It is the grey correlation between the root mean square value of the scattering angle and the root mean square value of the reference scattering angle.

[0129] Typically this can be set to 0.5.

[0130] S305-2. The material of the layer where the detection area is located in the sample model corresponding to the reference scattering angle root mean square value with the largest grey correlation degree is taken as the material attribute.

[0131] In step S305-2, a sample model corresponding to the reference scattering angle RMS value having the largest grey correlation with the RMS value of the scattering angle is found, and the material of the layer where the detection area is located is searched in the sample model, and the material is used as the material property of the detection area.

[0132] For example, through the grey correlation calculation, it is found that the grey correlation between the root mean square value of the scattering angle of the detection area and the root mean square value of the reference scattering angle corresponding to the sample model with the material scene of steel and water is the largest. In the sample model with the material scene of steel and water, if the material of the layer where the detection area is located is water, the material attribute of the detection area is determined to be water, and if the material of the layer where the detection area is located is steel, the material attribute of the detection area is determined to be steel.

[0133] In this exemplary embodiment, sample models with different material scenarios are established, and each sample model is divided into multiple layers with the same size as the detection area along the arrangement direction of the first position detector, the reactor pressure vessel, and the second position detector. By simulating the process of muons passing through the sample model, the reference scattering angle root mean square value of each layer of each sample model is calculated to establish a reference sequence. By observing and calculating the root mean square value of the scattering angle of the muons in each detection area in the reactor pressure vessel, the gray correlation degree is calculated for multiple reference scattering angle root mean square values ​​of the layer where the detection area is located in the reference sequence, and the sample model corresponding to the reference scattering angle root mean square value with the largest gray correlation degree is used to obtain the material properties of the detection area, and then the liquid level in the reactor pressure vessel is obtained, thereby realizing non-destructive and non-invasive detection of the liquid level in the reactor pressure vessel.

[0134] The exemplary embodiment of the present application provides a liquid level detection method for detecting the liquid level in a reactor pressure vessel of a nuclear power plant, wherein the reactor pressure vessel is arranged between a first position detector and a second position detector, the first position detector and the second position detector are plate-shaped, and the first position detector and the second position detector are arranged opposite to each other. Figure 8 As shown, the liquid level detection method shown in this exemplary embodiment includes:

[0135] S801. Divide the reactor pressure vessel into a plurality of detection areas, wherein the plurality of detection areas have the same size in a first direction, and the first direction is an arrangement direction of the first position detector, the reactor pressure vessel, and the second position detector.

[0136] S802. Use a first position detector to record the incident information of multiple muons, and use a second position detector to record the exit information of multiple muons, wherein each muon of the multiple muons passes through the first position detector, the reactor pressure vessel, and the second position detector in sequence, the incident information of the muon is the incident position and incident direction of the muon into the reactor pressure vessel, and the exit information of the muon is the exit position and exit direction of the muon from the reactor pressure vessel.

[0137] S803. Determine the incident path of the muon based on the incident position and incident direction.

[0138] S804. Determine the emission path of the muon based on the emission position and emission direction.

[0139] S805, taking the midpoint of the line connecting the two closest points on the incident path and the outgoing path as the ideal scattering point, and taking the detection area where the ideal scattering point is located as the detection area where the muon scattering occurs.

[0140] S806: taking the angle between the incident path and the outgoing path as the scattering angle.

[0141] S807: Calculate the root mean square value of the scattering angle of scattering occurring in each of the multiple detection areas.

[0142] S808. Establish multiple sample models, wherein the material scenarios of the multiple sample models are different, and the sizes of the multiple sample models are the same as the size of the reactor pressure vessel.

[0143] The material scenarios of the multiple sample models may include three material scenarios of steel, steel and water, and steel and uranium dioxide.

[0144] S809 . Divide each sample model of the multiple sample models into multiple layers along the first direction, wherein each layer has the same size as the detection area along the first direction.

[0145] S810, simulating a process in which multiple muons pass through a sample model, and calculating a root mean square value of a reference scattering angle of each layer.

[0146] S811. Use a set of reference scattering angle root mean square values ​​of multiple layers of multiple sample models as a reference sequence.

[0147] S812, performing grey correlation calculation on the root mean square value of the scattering angle and the root mean square values ​​of multiple reference scattering angles corresponding to the layer where the same detection area is located in the reference sequence.

[0148] S813. The material of the layer where the detection area is located in the sample model corresponding to the reference scattering angle root mean square value with the largest grey correlation degree is taken as the material attribute.

[0149] S814. Determine the material distribution in the reactor pressure vessel based on the material properties of the multiple detection areas.

[0150] S815. Determine the liquid level based on the material distribution.

[0151] In this exemplary embodiment, sample models with different material scenarios are established, and each sample model is divided into multiple layers with the same size as the detection area along the arrangement direction of the first position detector, the reactor pressure vessel, and the second position detector. By simulating the process of muons passing through the sample model, the reference scattering angle root mean square value of each layer of each sample model is calculated to establish a reference sequence. By observing and calculating the root mean square value of the scattering angle of muons in each detection area in the reactor pressure vessel, the gray correlation degree is calculated for multiple reference scattering angle root mean square values ​​of the layer where the detection area is located in the reference sequence, and the sample model corresponding to the reference scattering angle root mean square value with the largest gray correlation degree is used to obtain the material properties of the detection area, and then the liquid level in the reactor pressure vessel is obtained, so that non-destructive and non-invasive detection of the liquid level in the reactor pressure vessel is achieved, and the first position detector and the second position detector are installed outside the reactor pressure vessel, so that the maximum service life, inspection, maintenance and adjustment of the position detectors are less affected by the reactor refueling cycle.

[0152] The exemplary embodiment of the present application provides a liquid level detection device for detecting the liquid level in a reactor pressure vessel of a nuclear power plant, wherein the reactor pressure vessel is arranged between a first position detector and a second position detector, the first position detector and the second position detector are plate-shaped, and the first position detector and the second position detector are arranged opposite to each other. Fig. 9 As shown, the liquid level detection device includes a detection area division module 91, an incident information and an exit information recording module 92, a first calculation module 93, a second calculation module 94, a third calculation module 95 and a liquid level determination module 96.

[0153] The detection area division module 91 is configured to divide the reactor pressure vessel into a plurality of detection areas, wherein the plurality of detection areas have the same size in a first direction, and the first direction is an arrangement direction of the first position detector, the reactor pressure vessel, and the second position detector.

[0154] The incident information and exit information recording module 92 is configured to use a first position detector to record the incident information of multiple muons, and use a second position detector to record the exit information of multiple muons, wherein each muon of the multiple muons passes through the first position detector, the reactor pressure vessel and the second position detector in sequence, the incident information of the muon is the incident position and incident direction of the muon into the reactor pressure vessel, and the exit information of the muon is the exit position and exit direction of the muon emitted from the reactor pressure vessel.

[0155] The first calculation module 93 is configured to obtain the detection area where the muon scattering occurs and the scattering angle of the muon scattering according to the incident information of the muon and the emission information of the muon.

[0156] The second calculation module 94 is configured to calculate a root mean square value of a scattering angle of scattering occurring in each of the plurality of detection areas.

[0157] The third calculation module 95 is configured to compare the root mean square value of the scattering angle with the data corresponding to the detection area in the reference sequence to obtain the material properties of the detection area, wherein the reference sequence includes the reference root mean square value of the scattering angle of muons scattered at different positions in different material scenarios.

[0158] The liquid level determination module 96 is configured to obtain the liquid level according to the material properties of the plurality of detection areas.

[0159] In this exemplary embodiment, the root mean square value of the scattering angle of the muons in each detection area in the reactor pressure vessel is observed and calculated, and compared with a reference sequence to obtain the liquid level in the reactor pressure vessel, thereby achieving non-destructive and non-invasive detection of the liquid level in the reactor pressure vessel, and the first position detector and the second position detector are installed outside the reactor pressure vessel, so that the maximum service life, inspection, maintenance and adjustment of the position detectors are less affected by the reactor refueling cycle.

[0160] In an exemplary embodiment of the present application, the liquid level detection device further includes: a reference sequence establishing module configured to establish a reference sequence.

[0161] In an exemplary embodiment of the present application, the reference sequence establishment module is further configured to:

[0162] Establishing a plurality of sample models, wherein the material scenarios of the plurality of sample models are different, and the sizes of the plurality of sample models are the same as the size of the reactor pressure vessel;

[0163] Divide each sample model of the plurality of sample models into a plurality of layers along a first direction, wherein each layer has the same size as the detection area along the first direction;

[0164] Simulate the process of multiple muons passing through the sample model and calculate the RMS value of the reference scattering angle of each layer;

[0165] A set of reference scattering angle root mean square values ​​of multiple layers of multiple sample models is used as a reference sequence.

[0166] In an exemplary embodiment of the present application, the material scenarios of the multiple sample models include three material scenarios: steel, steel and water, and steel and uranium dioxide.

[0167] In the exemplary embodiment of the present application, the third calculation module 95 is further configured to:

[0168] The gray correlation degree is calculated by using the root mean square value of the scattering angle and the root mean square values ​​of multiple reference scattering angles corresponding to the layer where the detection area is located in the reference sequence;

[0169] The material of the layer where the detection area is located in the sample model corresponding to the reference scattering angle root mean square value with the largest grey correlation degree is taken as the material attribute.

[0170] In the exemplary embodiment of the present application, the first calculation module 93 is further configured to:

[0171] The incident path of the muon is obtained based on the incident position and incident direction;

[0172] The emission path of the muon is obtained based on the emission position and emission direction;

[0173] The midpoint of the line connecting the two closest points on the incident path and the outgoing path is taken as the ideal scattering point, and the detection area where the ideal scattering point is located is taken as the detection area where the muon scattering occurs;

[0174] The angle between the incident path and the outgoing path is taken as the scattering angle.

[0175] In the exemplary embodiment of the present application, the liquid level determination module 96 is further configured to:

[0176] The material distribution in the reactor pressure vessel is obtained based on the material properties of multiple detection areas;

[0177] Based on the material distribution, the liquid level is obtained.

[0178] Each module in the above-mentioned liquid level detection device can be implemented in whole or in part by software, hardware or a combination thereof. Each module can be embedded in or independent of a processor in a computer device in the form of hardware, or can be stored in a memory in a computer device in the form of software, so that the processor can call and execute the operations corresponding to each module.

[0179] In an exemplary embodiment, a computer device is provided, including a processor and a memory, wherein the memory stores a computer program, and when the processor executes the computer program, the steps of any of the above-mentioned liquid level detection methods are implemented.

[0180] In an exemplary embodiment, a non-transitory computer-readable storage medium is provided, on which a computer program is stored, and when the computer program is executed by a processor, the steps of any of the above-mentioned liquid level detection methods are implemented. The computer-readable storage medium can be a ROM, a random access memory (RAM), a CD-ROM, a magnetic tape, a floppy disk, an optical data storage device, etc.

[0181] In an exemplary embodiment, a computer program product is provided, including a computer program, and when the computer program is executed by a processor, the steps of any of the above-mentioned liquid level detection methods are implemented.

[0182] refer to Fig.10 , a block diagram of a computer device that can be used as the present application will now be described, the computer device includes a computing unit 1001, which can perform various appropriate actions and processes according to a computer program stored in a read-only memory (ROM) 1002 or a computer program loaded from a storage unit 1008 to a random access memory (RAM) 1003. In the RAM 1003, various programs and data required for the operation of the computer device 1000 can also be stored. The computing unit 1001, the ROM 1002, and the RAM 1003 are connected to each other via a bus 1004. An input / output (I / O) interface 1005 is also connected to the bus 1004.

[0183] A plurality of components in the computer device 1000 are connected to the I / O interface 1005, including: an input unit 1006, an output unit 1007, a storage unit 1008, and a communication unit 1009. The input unit 1006 may be any type of device capable of inputting information to the computer device 1000, the input unit 1006 may receive input digital or character information, and generate key signal input related to user settings and / or function control of the computer device 1000, and may include but is not limited to a mouse, a keyboard, a touch screen, a track pad, a track ball, a joystick, a microphone, and / or a remote controller. The output unit 1007 may be any type of device capable of presenting information, and may include but is not limited to a display, a speaker, a video / audio output terminal, a vibrator, and / or a printer. The storage unit 1008 may include but is not limited to a disk and an optical disk. The communication unit 1009 allows the computer device 1000 to exchange information / data with other devices through a computer network such as the Internet and / or various telecommunication networks, and may include but is not limited to a modem, a network card, an infrared communication device, a wireless communication transceiver and / or a chipset, such as a Bluetooth™ device, a WiFi device, a WiMax device, a cellular communication device and / or the like.

[0184] The computing unit 1001 may be a variety of general and / or special processing components with processing and computing capabilities. Some examples of the computing unit 1001 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various dedicated artificial intelligence (AI) computing chips, various computing units running machine learning model algorithms, digital signal processors (DSPs), and any appropriate processors, controllers, microcontrollers, etc. The computing unit 1001 performs the various methods and processes described above, such as the detection method of the liquid level. For example, in some embodiments, the detection method of the liquid level may be implemented as a computer software program, which is tangibly included in a machine-readable medium, such as a storage unit 1008. In some embodiments, part or all of the computer program may be loaded and / or installed on the computer device 1000 via the ROM 1002 and / or the communication unit 1009. When the computer program is loaded into the RAM 1003 and executed by the computing unit 1001, one or more steps of the detection method of the liquid level described above may be performed. Alternatively, in other embodiments, the computing unit 1001 may be configured to execute the liquid level detection method in any other appropriate manner (for example, by means of firmware).

[0185] The computer device 1000 can be implemented by one or more application-specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs), controllers, microcontrollers, microprocessors or other electronic components to execute the above-mentioned liquid level detection method.

[0186] Those skilled in the art will readily appreciate other embodiments of the present invention after considering the specification and practicing the invention disclosed herein. This application is intended to cover any modification, use or adaptation of the present invention, which follows the general principles of the present invention and includes common knowledge or customary techniques in the art that are not disclosed in this application. The specification and examples are to be considered as exemplary only, and the true scope and spirit of the present invention are indicated by the appended claims.

[0187] It should be understood that the present invention is not limited to the exact construction that has been described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

Claims

1. A method for detecting a liquid level, characterized in that: Used to detect the liquid level in a reactor pressure vessel of a nuclear power plant, the reactor pressure vessel is arranged between a first position detector and a second position detector, the first position detector and the second position detector are plate-shaped, the first position detector and the second position detector are arranged opposite to each other, and the liquid level detection method includes: Dividing the reactor pressure vessel into a plurality of detection areas, wherein the plurality of detection areas have the same size in a first direction, the first direction being an arrangement direction of the first position detector, the reactor pressure vessel and the second position detector; Using the first position detector to record the incident information of a plurality of muons, and using the second position detector to record the exit information of the plurality of muons, wherein each muon of the plurality of muons sequentially passes through the first position detector, the reactor pressure vessel, and the second position detector, the incident information of the muon is the incident position and the incident direction of the muon into the reactor pressure vessel, and the exit information of the muon is the exit position and the exit direction of the muon from the reactor pressure vessel; According to the incident information of the muon and the emission information of the muon, a detection area where the muon is scattered and a scattering angle at which the muon is scattered are obtained; calculating a root mean square value of a scattering angle of scattering occurring in each of the plurality of detection areas; Comparing the root mean square value of the scattering angle with data of a position corresponding to the detection area in a reference sequence to obtain material properties of the detection area, wherein the reference sequence includes reference root mean square values ​​of scattering angles of muons scattered at different positions in different material scenarios; Determining the liquid level according to the material properties of the multiple detection areas; The method of obtaining the detection area where the muon is scattered and the scattering angle at which the muon is scattered according to the incident information of the muon and the emission information of the muon includes: Determining the incident path of the muon according to the incident position and the incident direction; Determining the emission path of the muon according to the emission position and the emission direction; The midpoint of the line connecting the two closest points on the incident path and the outgoing path is taken as an ideal scattering point, and the detection area where the ideal scattering point is located is taken as the detection area where the muon scattering occurs; The angle between the incident path and the outgoing path is taken as the scattering angle.

2. The method for detecting a liquid level according to claim 1, characterized in that: The liquid level detection method further comprises: The reference sequence is established.

3. The method for detecting a liquid level according to claim 2, characterized in that: The establishing of the reference sequence comprises: Establishing a plurality of sample models, wherein the material scenes of the plurality of sample models are different and the sizes of the plurality of sample models are the same as the size of the reactor pressure vessel; Divide each of the plurality of sample models into a plurality of layers along the first direction, wherein each layer has the same size as the detection area along the first direction; Simulating a process in which a plurality of muons pass through the sample model, and calculating a root mean square value of a reference scattering angle of each layer; A set of reference scattering angle root mean square values ​​of multiple layers of the multiple sample models is used as the reference sequence.

4. The method for detecting a liquid level according to claim 3, characterized in that: The material scenarios of the multiple sample models include three material scenarios: steel, steel and water, and steel and uranium dioxide.

5. The method for detecting liquid level according to claim 3, characterized in that: The step of comparing the root mean square value of the scattering angle with data of a position corresponding to the detection area in a reference sequence to obtain a material property of the detection area includes: Calculate the grey correlation degree of the root mean square value of the scattering angle and the root mean square values ​​of multiple reference scattering angles in the reference sequence corresponding to the layer where the detection area is located; The material of the layer where the detection area is located in the sample model corresponding to the reference scattering angle root mean square value with the largest grey correlation degree is used as the material attribute.

6. The method for detecting a liquid level according to any one of claims 1 to 5, characterized in that: Determining the liquid level according to the material properties of the multiple detection areas includes: Determining material distribution in the reactor pressure vessel according to material properties of the multiple detection areas; The liquid level is obtained according to the material distribution.

7. A liquid level detection device, characterized in that: Used to detect the liquid level in a reactor pressure vessel of a nuclear power plant, the reactor pressure vessel is arranged between a first position detector and a second position detector, the first position detector and the second position detector are plate-shaped, the first position detector and the second position detector are arranged opposite to each other, and the liquid level detection device comprises: a detection area division module, configured to divide the reactor pressure vessel into a plurality of detection areas, wherein the plurality of detection areas have the same size in a first direction, the first direction being an arrangement direction of the first position detector, the reactor pressure vessel and the second position detector; an incident information and an exit information recording module, configured to use the first position detector to record the incident information of a plurality of muons, and use the second position detector to record the exit information of the plurality of muons, wherein each muon of the plurality of muons sequentially passes through the first position detector, the reactor pressure vessel and the second position detector, the incident information of the muon is the incident position and the incident direction of the muon incident on the reactor pressure vessel, and the exit information of the muon is the exit position and the exit direction of the muon emitted from the reactor pressure vessel; A first calculation module is configured to obtain a detection area where the muon is scattered and a scattering angle at which the muon is scattered according to the incident information of the muon and the emission information of the muon; A second calculation module is configured to calculate a root mean square value of a scattering angle of scattering occurring in each of the plurality of detection areas; A third calculation module is configured to compare the root mean square value of the scattering angle with data of a position corresponding to the detection area in a reference sequence to obtain a material property of the detection area, wherein the reference sequence includes reference root mean square values ​​of scattering angles of muons scattered at different positions in different material scenarios; a liquid level determination module, configured to obtain the liquid level according to the material properties of the plurality of detection areas; The first computing module is further configured to: Determining the incident path of the muon according to the incident position and the incident direction; Determining the emission path of the muon according to the emission position and the emission direction; The midpoint of the line connecting the two closest points on the incident path and the outgoing path is taken as an ideal scattering point, and the detection area where the ideal scattering point is located is taken as the detection area where the muon scattering occurs; The angle between the incident path and the outgoing path is taken as the scattering angle.

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 liquid level detection method according to any one of claims 1 to 6 are implemented.

9. A non-transitory 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 liquid level detection method according to any one of claims 1 to 6 are implemented.

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