Ultrasonic-based methods, devices, storage media, and electronic equipment for measuring fuel assembly deformation.

Abstract

This invention relates to an ultrasonic-based method, apparatus, storage medium, and electronic device for measuring fuel assembly deformation, comprising the following steps: acquiring ultrasonic detection signals of each grid layer of the fuel assembly under test; calculating the relative torsional angle of each grid layer based on the ultrasonic detection signals of each grid layer, combined with the cross-sectional dimensions of the fuel assembly under test and ultrasonic probe information; calculating the deflection angle between two adjacent grid layers of the fuel assembly under test to obtain the relative deflection angle of each grid layer; and measuring the deformation of the fuel assembly under test based on the relative torsional angle and relative deflection angle of each grid layer. This invention employs ultrasonic measurement technology, utilizing the tip scattering principle of ultrasonic waves. It can measure the deformation of the fuel assembly based on the transmit and receive signals of each ultrasonic probe, while also reducing the number of ultrasonic probes in the hardware, significantly improving detection efficiency.

Description

Technical Field

[0001] This invention relates to the field of nuclear power fuel assembly testing technology, and more specifically, to an ultrasonic-based method, apparatus, storage medium, and electronic device for measuring fuel assembly deformation. Background Technology

[0002] Fuel assemblies are the core components of a nuclear power plant reactor, and their performance directly affects the safety and efficiency of the plant. During operation, fuel assemblies gradually fatigue and deform under the high temperature, high pressure, and high radiation environment. Common deformations include external and internal deformations. External deformations include changes in the size and position of the assembly, while internal deformations may involve changes in the arrangement of fuel pellets. If these deformations are not detected and assessed in a timely manner, they may lead to serious safety problems. Therefore, the measurement and assessment of fuel assembly deformation is crucial.

[0003] Currently, the main methods for measuring fuel assembly deformation include contact measurement and non-contact measurement.

[0004] Contact measurement mainly uses probe-based measurement. The specific method involves contacting the object being measured with a probe and reflecting the shape and size information of the target object based on the displacement of the probe. This method carries a certain risk of damaging fuel assemblies, and the types of parameters that can be detected are limited. The equipment is also prone to activation, and due to the physical limitations of contact equipment, it is difficult to achieve high-frequency real-time measurement under extreme dynamic conditions.

[0005] Non-contact measurement primarily utilizes visual, laser, and ultrasonic methods. The disadvantages of visual measurement methods include the large size, weight, and poor radiation resistance of current visual imaging fuel rod assembly inspection devices. Laser measurement methods are sensitive to environmental conditions; roughness and unevenness of the surface can lead to measurement errors. Existing ultrasonic testing technologies for fuel assemblies typically require a large number of ultrasonic probes (usually more than four, generally at least six or eight) per layer to ensure accurate measurement of deformation at a specific level, resulting in low inspection efficiency and the inability to measure the torsional angle of the fuel assembly. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide an ultrasonic-based method, device, storage medium and electronic device for measuring the deformation of fuel assemblies, addressing the problems existing in the prior art.

[0007] The technical solution adopted by this invention to solve its technical problem is: constructing an ultrasonic-based method for measuring fuel assembly deformation, comprising the following steps:

[0008] Acquire ultrasonic detection signals for each grid layer of the fuel assembly under test;

[0009] Based on the ultrasonic detection signals of each grid layer, and combined with the cross-sectional dimensions of the fuel assembly under test and the ultrasonic probe information, the relative torsional angle of each grid layer of the fuel assembly under test is calculated.

[0010] The deflection angle between two adjacent grid layers of the fuel assembly under test is calculated to obtain the relative deflection angle of each grid layer of the fuel assembly under test.

[0011] The deformation of the fuel assembly under test is measured based on the relative torsion angle and relative deflection angle of each grid layer of the fuel assembly under test.

[0012] In the ultrasonic-based fuel assembly deformation measurement method of the present invention, the ultrasonic detection signal includes: detection time; the detection time is the time from emitting ultrasonic waves to receiving the reflected signal from the tip; the ultrasonic probe information includes: the propagation speed of ultrasonic waves in the medium and the dimensions of the ultrasonic probe mounting bracket; the detection time includes: the first tip propagation time and the second tip propagation time.

[0013] The calculation of the relative torsional angle of each grid layer of the fuel assembly under test, based on the ultrasonic detection signal of each grid layer and combined with the cross-sectional dimensions of the fuel assembly under test and the ultrasonic probe information, includes:

[0014] The first detection distance is obtained by calculating based on the propagation time of the first tip and the propagation speed;

[0015] The second detection distance is obtained by calculating based on the propagation time of the second tip and the propagation speed.

[0016] The endpoint coordinates are calculated based on the first detection distance, the second detection distance, and the dimensions of the ultrasonic probe mounting bracket.

[0017] The relative torsional angle of each grid layer of the fuel assembly under test is calculated based on the endpoint coordinates and the cross-sectional dimensions of the fuel assembly under test.

[0018] In the ultrasonic-based fuel assembly deformation measurement method of the present invention, the first tip propagation time includes: a first propagation time and a second propagation time; the first detection distance includes: a first distance and a second distance;

[0019] The calculation of the first detection distance based on the propagation time of the first tip and the propagation speed includes:

[0020] The first distance is obtained by calculating based on the first propagation time and propagation speed;

[0021] The second distance is obtained by calculating based on the second propagation time and propagation speed.

[0022] In the ultrasonic-based fuel assembly deformation measurement method of the present invention, the endpoint coordinates include: the coordinates of the first tip;

[0023] The endpoint coordinates are calculated based on the first detection distance, the second detection distance, and the dimensions of the ultrasonic probe mounting bracket, including:

[0024] The first included angle is calculated based on the first distance, the second distance, and the dimensions of the ultrasonic probe mounting bracket;

[0025] The coordinates of the first tip are obtained by calculating based on the first included angle and the first distance.

[0026] In the ultrasonic-based fuel assembly deformation measurement method of the present invention, the endpoint coordinates include: the second tip coordinates;

[0027] The second tip propagation time includes: the third propagation time and the fourth propagation time; the second detection range includes: the third range and the fourth range;

[0028] The calculation of the second detection distance based on the second tip propagation time and the propagation speed includes:

[0029] The second included angle is calculated based on the third distance, the fourth distance, and the dimensions of the ultrasonic probe mounting bracket.

[0030] The coordinates of the second tip are obtained by calculating based on the second included angle and the third distance.

[0031] In the ultrasonic-based fuel assembly deformation measurement method of the present invention, the calculation of the relative torsional angle of each layer of the fuel assembly under test based on the endpoint coordinates and the cross-sectional dimensions of the fuel assembly under test includes:

[0032] Based on the coordinates of the first tip and the second tip, and combined with the cross-sectional dimensions of the fuel assembly under test, the relative torsional angle of each grid layer of the fuel assembly under test is calculated.

[0033] In the ultrasonic-based fuel assembly deformation measurement method of the present invention, the step of measuring the deformation of the fuel assembly under test based on the relative torsional angle and relative deflection angle of each grid layer of the fuel assembly under test includes:

[0034] The relative torsion angle and relative deflection angle of each grid layer of the fuel assembly under test are integrated, and the graphic of the part is drawn to obtain the drawing graphic.

[0035] The deformation of the fuel assembly under test is obtained by comparing and analyzing the drawn graphic with the graphic of the reference fuel assembly.

[0036] The present invention also provides an ultrasonic-based fuel assembly deformation measurement device, comprising:

[0037] The signal acquisition unit is used to acquire the ultrasonic detection signals of each grid layer of the fuel assembly under test;

[0038] The torsion angle calculation unit is used to calculate the relative torsion angle of each layer of the fuel assembly under test based on the ultrasonic detection signal of each layer of the grid, combined with the cross-sectional dimensions of the fuel assembly under test and the ultrasonic probe information.

[0039] The deflection angle calculation unit is used to calculate the deflection angle between two adjacent grid layers of the fuel assembly under test, and to obtain the relative deflection angle of each grid layer of the fuel assembly under test.

[0040] The deformation measurement unit is used to measure the deformation of the fuel assembly under test based on the relative torsion angle and relative deflection angle of each grid layer of the fuel assembly under test.

[0041] The present invention also provides a storage medium storing a computer program adapted for loading by a processor to perform the steps of the ultrasonic-based fuel assembly deformation measurement method as described above.

[0042] The present invention also provides an electronic device, including a memory and a processor, wherein the memory stores a computer program, and the processor executes the steps of the ultrasonic-based fuel assembly deformation measurement method as described above by calling the computer program stored in the memory.

[0043] The ultrasonic-based fuel assembly deformation measurement method, apparatus, storage medium, and electronic device of this invention have the following beneficial effects: The method includes the following steps: acquiring ultrasonic detection signals for each layer of the fuel assembly under test; calculating the relative torsional angle of each layer of the fuel assembly under test based on the ultrasonic detection signals of each layer, combined with the cross-sectional dimensions of the fuel assembly under test and ultrasonic probe information; calculating the deflection angle between two adjacent layers of the fuel assembly under test to obtain the relative deflection angle of each layer of the fuel assembly under test; and measuring the deformation of the fuel assembly under test based on the relative torsional angle and relative deflection angle of each layer of the fuel assembly under test. This invention employs ultrasonic measurement technology, utilizing the principle of ultrasonic tip scattering. It can measure the deformation of the fuel assembly based on the transmitted and received signals of each ultrasonic probe, while also reducing the number of ultrasonic probes in the hardware, significantly improving detection efficiency. Attached Figure Description

[0044] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the accompanying drawings:

[0045] Figure 1 This is a flowchart illustrating the ultrasonic-based fuel assembly deformation measurement method provided by the present invention.

[0046] Figure 2 This is a flowchart of the ultrasonic-based fuel assembly deformation measurement method provided by the present invention.

[0047] Figure 3 This is a schematic diagram showing the distribution of the i-th layer grid and the ultrasonic probe provided by the present invention;

[0048] Figure 4 This is a schematic diagram of the distribution of adjacent grids provided by the present invention;

[0049] Figure 5 This is the distribution pattern of the ultrasonic probes in the fuel assembly provided by the present invention;

[0050] Figure 6 This invention provides the tip scattering effect of ultrasonic waves;

[0051] Figure 7 This refers to the transmission and reception information of the ultrasonic probe signal provided by this invention;

[0052] Figure 8 This is a schematic diagram of the ultrasonic-based fuel assembly deformation measurement device provided by the present invention. Detailed Implementation

[0053] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0054] Specifically, in an ideal fuel assembly, the corresponding points on each horizontal cross-section are perfectly aligned horizontally. When the fuel assembly deforms, these corresponding points on each cross-section will shift and misalign. Therefore, by measuring and analyzing the coordinates of the corresponding points on the horizontal cross-sections of the upper and lower tube supports and each grid, the deformation of the fuel assembly can be analyzed. Based on this principle, this invention employs ultrasonic measurement technology. Utilizing the principle of ultrasonic tip scattering, the number of ultrasonic probes can be reduced. Simultaneously, based on the signals received and transmitted by each ultrasonic probe, the coordinate values ​​in the coordinate system of the horizontal cross-section endpoints (i.e., the tips of the fuel assembly) of the upper and lower tube supports and each grid are measured. By analyzing the difference between the measured coordinate positions and the ideal coordinate positions, the deformation of the fuel assembly can be determined.

[0055] The principle of tip scattering of ultrasound is as follows: Tip scattering refers to the phenomenon that ultrasound waves are scattered when they encounter the edge or tip of a sharp object. Due to the geometric characteristics of the tip, the propagation direction of the ultrasound waves will change, forming a specific scattering pattern. Based on this principle, it can be ensured that multiple ultrasound probes can receive the scattered signal emitted from the same tip.

[0056] The principle of ultrasonic ranging is based on the reflection of ultrasonic waves. Since the speed of ultrasonic wave propagation in a medium is known, and considering the time it takes for the ultrasonic probe to collect the reflected signal, the distance *s* between the probe and the reflection point at the tip of the component can be calculated.

[0057] s=(c×t) / 2 (1);

[0058] (1) In the formula, c is the speed of ultrasonic wave propagation in the medium, and t is the time from the ultrasonic probe to the acquisition of the reflected signal.

[0059] Based on the above principles, this invention provides an ultrasonic-based method for measuring fuel assembly deformation. In this method, only four ultrasonic probes are needed for each layer of the fuel assembly to measure the torsional and deflection angles of each layer, thus achieving deformation measurement of the fuel assembly. The simulation information regarding ultrasonic tip scattering and ultrasonic probe signal reception is as follows: Figure 5 , Figure 6 and Figure 7 As shown, the tip scattering effect of ultrasound combined with ultrasound reflection can be used to determine the coordinate position of the component's endpoints, thereby analyzing the deformation of the fuel assembly.

[0060] Specifically, such as Figure 1 As shown, the ultrasonic-based fuel assembly deformation measurement method includes the following steps:

[0061] Step S101: Obtain the ultrasonic detection signal of each grid layer of the fuel assembly under test.

[0062] In this embodiment of the invention, the ultrasonic detection signal includes: detection time; the detection time is the time from the emission of ultrasonic waves to the receipt of the reflected signal from the tip. It should be noted that the transceiver signals of the ultrasonic probe also need to be acquired during signal acquisition.

[0063] Step S102: Based on the ultrasonic detection signal of each grid layer, and combined with the cross-sectional dimensions of the fuel assembly under test and the ultrasonic probe information, calculate to obtain the relative torsional angle of each grid layer of the fuel assembly under test.

[0064] In this embodiment of the invention, the ultrasonic probe information includes: the propagation speed of ultrasonic waves in the medium and the dimensions of the ultrasonic probe mounting bracket; the detection time includes: the propagation time of the first tip and the propagation time of the second tip.

[0065] In this embodiment of the invention, the relative torsional angle of each layer of the fuel assembly under test is calculated based on the ultrasonic detection signal of each layer of the grid, combined with the cross-sectional dimensions of the fuel assembly under test and the ultrasonic probe information. This includes: calculating a first detection distance based on the propagation time and speed of the first tip; calculating a second detection distance based on the propagation time and speed of the second tip; calculating the endpoint coordinates based on the first detection distance, the second detection distance and the dimensions of the ultrasonic probe mounting bracket; and calculating the relative torsional angle of each layer of the fuel assembly under test based on the endpoint coordinates and the cross-sectional dimensions of the fuel assembly under test.

[0066] In this embodiment of the invention, the first tip propagation time includes: a first propagation time and a second propagation time; the first detection distance includes: a first distance and a second distance. Specifically, calculating the first detection distance based on the first tip propagation time and propagation speed includes: calculating the first distance based on the first propagation time and propagation speed; and calculating the second distance based on the second propagation time and propagation speed.

[0067] In this embodiment of the invention, the endpoint coordinates include: first tip coordinates. Specifically, obtaining the endpoint coordinates by calculating based on the first detection distance, the second detection distance, and the dimensions of the ultrasonic probe mounting bracket includes: calculating a first included angle based on the first distance, the second distance, and the dimensions of the ultrasonic probe mounting bracket; and calculating the first tip coordinates based on the first included angle and the first distance.

[0068] In this embodiment of the invention, the endpoint coordinates include: the second tip coordinates.

[0069] The second tip propagation time includes: the third propagation time and the fourth propagation time; the second detection distance includes: the third distance and the fourth distance; the second detection distance is calculated based on the second tip propagation time and propagation speed, including: calculating the second included angle based on the third distance, the fourth distance and the size of the ultrasonic probe mounting bracket; and calculating the second tip coordinates based on the second included angle and the third distance.

[0070] In this embodiment of the invention, the calculation of the relative torsion angle of each grid layer of the fuel assembly under test based on the endpoint coordinates and the cross-sectional dimensions of the fuel assembly under test includes: calculating the relative torsion angle of each grid layer of the fuel assembly under test based on the first tip coordinates and the second tip coordinates, combined with the cross-sectional dimensions of the fuel assembly under test.

[0071] Step S103: Calculate the deflection angle between two adjacent grid layers of the fuel assembly under test to obtain the relative deflection angle of each grid layer of the fuel assembly under test.

[0072] Step S104: Measure the deformation of the fuel assembly under test based on the relative torsion angle and relative deflection angle of each grid layer of the fuel assembly under test.

[0073] In this embodiment of the invention, measuring the deformation of the fuel assembly under test based on the relative torsion angle and relative deflection angle of each grid layer of the fuel assembly under test includes: integrating the relative torsion angle and relative deflection angle of each grid layer of the fuel assembly under test, and drawing the part to obtain the drawn drawing; comparing and analyzing the drawn drawing with the drawing of a reference fuel assembly to obtain the deformation of the fuel assembly under test.

[0074] like Figure 2 The diagram shown is a flowchart of the ultrasonic-based fuel assembly deformation measurement method provided by the present invention.

[0075] Specifically, the fuel assembly under test includes an upper tube rack, a lower tube rack, and an intermediate multi-layer grid, totaling N layers. For ease of calculation, the lower tube rack and lower pipes are also defined as "grids". The layers from the lower tube rack to the upper tube rack are numbered sequentially as 1, 2, ..., N.

[0076] The relative torsion angle is calculated using the i-th layer of the grid as an example. The distribution of the i-th layer of the grid and the ultrasound probe is as follows: Figure 3 As shown. i1, i2, i3, and i3 are four ultrasonic probes on the i-th layer of the grid, which are installed diagonally.

[0077] Let the dimensions of the ultrasonic probe mounting bracket be L×L, and the cross-sectional dimensions of the fuel assembly be l×l. Establish a coordinate system with the ultrasonic probe i1 as the origin. The arrangement of the ultrasonic probes is shown in the figure. The central axis of each probe forms a 45° angle with the coordinate axis. Establish a coordinate system with the center of the ultrasonic probe i1 as the coordinate origin O.

[0078] When the fuel assembly under test undergoes torsion, the relative torsion angle θ i (Considering practical application scenarios, the torsion angle range of the experiment is set to within ±5°), and the specific calculation method is as follows:

[0079] First, the speed of ultrasonic wave propagation in the medium is c. The ultrasonic probe i1 is a self-emitting and self-receiving probe. When the probe emits ultrasonic waves, assuming the time from the emission of the ultrasonic wave to the reception of the reflected signal from the tip D is t1 (i.e., the first propagation time), according to formula (1), the distance l between the probe i1 and the tip is... OD (i.e., the first distance):

[0080] l OD = (c×t1) / 2 (2);

[0081] Due to the tip scattering effect of ultrasound, the ultrasonic probe i4 can receive the scattered signal from the tip D. Assuming the time for receiving the signal is t2 (i.e., the second propagation time), then the distance l between the probe i4 and the tip D is... CD (i.e., the second distance):

[0082] l CD = (c×t2) / 2 (3);

[0083] Given the dimensions of the ultrasonic probe mounting bracket and ∠HOD = α, by the Law of Cosines:

[0084]

[0085] Among them l OC Let L be the distance between OC.

[0086] Let the coordinates of point D be (x D, y D (i.e., the coordinates of the first apex), we have:

[0087] x D =l OD ×cosα (5);

[0088] y D =l OD ×sinα (6);

[0089] Similarly, the third and fourth distances can be calculated using the above method, and thus the coordinates of point G can be obtained as (x G ,y G(i.e., the coordinates of the second tip), then the torsion angle θ of the fuel assembly relative to the ideal grid (where θ is the relative torsion angle of the i-th layer of the grid). Wherein,

[0090]

[0091] It should be noted that the above Figure 1 In this calculation, the relative torsion angle of the i-th layer of the lattice is obtained by calculating the coordinate values ​​of the tips D and G. This is just one method for calculating the i-th layer of the lattice. Similarly, it can also be calculated by calculating the coordinate values ​​of the tips E and F. In this case, it is necessary to collect the ultrasonic detection signals from ultrasonic probes i2 and i3 for relevant calculations. Alternatively, the relative torsion angle can be calculated from the ultrasonic detection signals of the four ultrasonic probes, and then the average value can be taken to obtain the final relative torsion angle.

[0092] After obtaining the relative torsion angle of the i-th layer of the lattice, the relative torsion angles of other layers of the lattice are calculated, recorded, and stored in sequence. The relative torsion angles of all layers of the fuel assembly under test are organized and compared with the parameters of the fuel assembly under test (i.e., the reference fuel assembly), thereby realizing the analysis and measurement of the torsional deformation of the fuel assembly under test. That is, the amount of torsional deformation or torsional deformation data of the fuel assembly under test can be obtained by comparison.

[0093] For the calculation of the relative deflection angle:

[0094] The calculation of fuel assembly deflection angle using the (i-1)th layer grid (ideal case) and the ith layer grid is explained below. The distribution of the (i-1)th layer grid and the ith layer grid is as follows. Figure 4 As shown:

[0095] Based on the aforementioned measurement principle, to calculate the spatial coordinates of each point on the i-th layer (establishing a spatial coordinate system with the first probe of the first layer as the origin), we have D(x D ,y D ,z D ), E(x) E ,y E ,z E ), F(x) F ,y F ,z F ), G(x) G, y G ,z G If the center point I(x) is... I, y I ,z I )have:

[0096]

[0097] z I =zD =z E =z F =z G =i×h (10);

[0098] Where i is the number of lattice layers and h is the height between lattice layers.

[0099] The center coordinates of the (i-1)th ideal fuel assembly are known: I'(x) I' ,y I' ,z I' );

[0100] z I =i×(h-1) (11);

[0101] Then the distance L of II' II' :

[0102]

[0103] J is the projection point of I' in the i-th layer, and its coordinates are: J(x I' ,y I' ,z I If the distance L between I and J is given, then... IJ :

[0104]

[0105] The distance between JI' is the distance between the lattice frames, with a value of h, therefore the deflection angle θ' is:

[0106]

[0107] In (14), the deflection angle θ' is the relative deflection angle between the i-th layer and the (i-1)-th layer. Thus, the deformation measurement of the i-th layer of the fuel assembly under test is completed.

[0108] After calculating the relative deflection angle of each layer sequentially using the above method, the data is recorded and stored. The relative deflection angles of all layers of the fuel assembly under test are then organized and compared with the parameters of the reference fuel assembly. This allows for the analysis and measurement of the deflection deformation of the fuel assembly under test; that is, the amount of deflection deformation or deflection deformation data of the fuel assembly under test can be obtained through comparison. In other words, by sequentially recording and integrating the deflection angles between adjacent layers and comparing them with the reference fuel assembly (three-dimensional geometry), the deflection deformation of the fuel assembly under test can be obtained.

[0109] Finally, the relative torsion angles and relative deflection angles of all layers of the fuel assembly under test are used to draw the part, and the drawn drawing is compared with the ideal fuel assembly. Based on the comparison results, the overall deformation amount or deformation data of the fuel assembly under test is obtained, thus completing the deformation measurement and analysis of the fuel assembly under test.

[0110] Specifically, the fuel assembly is a slender structure that requires multiple layers of ultrasonic sensors (i.e., ultrasonic probes) to be arranged along its length, with four ultrasonic sensors in each layer to perform torsional measurements on each layer separately. For example, taking a 12-layer assembly as an example, the torsion of the first layer is measured first. As the assembly is placed into the grid, the torsional angles of layers 1 through 12 are obtained sequentially, for a total of 12 torsional angles. After obtaining the torsional angles of each layer, the overall torsional deformation of the fuel assembly under test is evaluated using an ideal fuel assembly as a reference.

[0111] Similarly, for the fuel assembly under test, the measurement results of the upper and lower layers are needed to obtain the deflection angle. Taking layers 1 to 12 as an example, with layer 1 as the reference, layers 2 to 12 can be obtained, for a total of 11 deflection angles. These 11 deflection angles are then used to evaluate the overall deflection deformation of the fuel assembly under test.

[0112] Finally, by integrating the aforementioned torsion angle and deflection angle and comparing them with the understood fuel assembly, the overall deformation of the fuel assembly under test is obtained.

[0113] The ultrasonic-based fuel assembly deformation measurement method of the present invention can detect the deformation and bending of the assembly with a small number of probes; it has high sensitivity and can detect minute deformations of the assembly; it is a non-destructive testing method that will not damage the material; it is suitable for testing in high-radiation and high-temperature environments; and it improves testing efficiency and accuracy.

[0114] This invention enables the analysis of fuel assembly deformation in high-radiation, high-temperature environments without damaging materials and while ensuring accurate detection and analysis. It utilizes the tip scattering effect of ultrasound to achieve this analysis with a smaller number of probes combined with ultrasonic measurement technology. This invention can be applied to in-service inspection of nuclear power plant fuel assemblies, monitoring their deformation during operation to ensure the safety and efficiency of the nuclear power plant.

[0115] This invention can improve the efficiency and accuracy of fuel assembly inspection, reduce inspection time, promptly detect fuel assembly deformation problems, avoid potential safety hazards, extend the service life of fuel assemblies through non-destructive testing methods, optimize fuel assembly maintenance strategies, reduce unnecessary downtime, and improve the overall operational safety and economy of nuclear power plants.

[0116] refer to Figure 8 , Figure 8The schematic diagram of the ultrasonic-based fuel assembly deformation measurement device provided by the present invention.

[0117] Specifically, such as Figure 8 As shown, the ultrasound-based fuel assembly deformation measurement device includes:

[0118] The signal acquisition unit 801 is used to acquire the ultrasonic detection signals of each grid layer of the fuel assembly under test.

[0119] The torsion angle calculation unit 802 is used to calculate the relative torsion angle of each layer of the fuel assembly under test based on the ultrasonic detection signal of each layer of the grid, combined with the cross-sectional dimensions of the fuel assembly under test and the ultrasonic probe information.

[0120] The deflection angle calculation unit 803 is used to calculate the deflection angle between two adjacent grid layers of the fuel assembly under test, and to obtain the relative deflection angle of each grid layer of the fuel assembly under test.

[0121] The deformation measurement unit 804 is used to measure the deformation of the fuel assembly under test based on the relative torsion angle and relative deflection angle of each grid layer of the fuel assembly under test.

[0122] Specifically, the specific operational process of the various units in the ultrasonic-based fuel assembly deformation measurement device can be referred to the ultrasonic-based fuel assembly deformation measurement method described above, and will not be repeated here.

[0123] Furthermore, an electronic device according to the present invention includes a memory and a processor; the memory is used to store a computer program; the processor is used to execute the computer program to implement the ultrasonic-based fuel assembly deformation measurement method as described above. Specifically, according to embodiments of the present invention, the processes described above with reference to the flowchart can be implemented as computer software programs. For example, embodiments of the present invention include a computer program product comprising a computer program carried on a computer-readable medium, the computer program containing program code for performing the methods shown in the flowchart. In such embodiments, when the computer program is downloaded, installed, and executed by an electronic device, it performs the functions defined above in the methods of the embodiments of the present invention. The electronic device in the present invention can be a terminal such as a laptop, desktop computer, tablet computer, or smartphone, or it can be a server.

[0124] Furthermore, one type of storage medium of the present invention stores a computer program thereon, which, when executed by a processor, implements the ultrasonic-based fuel assembly deformation measurement method described above. Specifically, it should be noted that the storage medium described above in the present invention can be a computer-readable signal medium or a computer-readable storage medium, or any combination thereof. A computer-readable storage medium can be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination thereof. More specific examples of a computer-readable storage medium may include, but are not limited to: an electrical connection having one or more wires, a portable computer disk, a hard disk, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), optical storage device, magnetic storage device, or any suitable combination thereof. In the present invention, a computer-readable storage medium can be any tangible medium containing or storing a program that can be used by or in conjunction with an instruction execution system, apparatus, or device. In the present invention, a computer-readable signal medium can include a data signal propagated in baseband or as part of a carrier wave, wherein computer-readable program code is carried. The transmitted data signal can take various forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination thereof. The computer-readable signal medium can also be any computer-readable medium other than a computer-readable storage medium, which can send, propagate, or transmit a program for use by or in connection with an instruction execution system, apparatus, or device. The program code contained on the computer-readable medium can be transmitted using any suitable medium, including but not limited to: wires, optical fibers, RF (radio frequency), etc., or any suitable combination thereof.

[0125] The aforementioned computer-readable medium may be included in the aforementioned electronic device; or it may exist independently and not assembled into the electronic device.

[0126] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.

[0127] Those skilled in the art will further recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of both. To clearly illustrate the interchangeability of hardware and software, the components and steps of the various examples have been generally described in terms of functionality in the foregoing description. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementations should not be considered beyond the scope of this invention.

[0128] The steps of the methods or algorithms described in conjunction with the embodiments disclosed herein can be implemented directly by hardware, a software module executed by a processor, or a combination of both. The software module can be located in random access memory (RAM), main memory, read-only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, removable disk, CD-ROM, or any other form of storage medium known in the art.

[0129] The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly. They do not limit the scope of protection of the present invention. All equivalent changes and modifications made within the scope of the claims of the present invention should fall within the scope of the claims of the present invention.

Claims

1. A method for measuring the deformation of a fuel assembly based on ultrasound, characterized in that, Includes the following steps: Acquire ultrasonic detection signals for each grid layer of the fuel assembly under test; The ultrasonic detection signal includes: detection time; the detection time is the time from emitting ultrasonic waves to receiving the reflected signal from the tip; Based on the ultrasonic detection signals of each grid layer, and combined with the cross-sectional dimensions of the fuel assembly under test and the ultrasonic probe information, the relative torsional angle of each grid layer of the fuel assembly under test is calculated; the ultrasonic probe information includes: the propagation speed of ultrasonic waves in the medium and the dimensions of the ultrasonic probe mounting bracket; the detection time includes: the propagation time of the first tip and the propagation time of the second tip. The calculation of the relative torsion angle of each grid layer of the fuel assembly under test, based on the ultrasonic detection signal of each grid layer and combined with the cross-sectional dimensions of the fuel assembly under test and the ultrasonic probe information, includes: calculating a first detection distance based on the first tip propagation time and the propagation speed; calculating a second detection distance based on the second tip propagation time and the propagation speed; calculating the endpoint coordinates based on the first detection distance, the second detection distance, and the dimensions of the ultrasonic probe mounting bracket; and calculating the relative torsion angle of each grid layer of the fuel assembly under test based on the endpoint coordinates and the cross-sectional dimensions of the fuel assembly under test. The deflection angle between two adjacent grid layers of the fuel assembly under test is calculated to obtain the relative deflection angle of each grid layer of the fuel assembly under test. The deformation of the fuel assembly under test is measured based on the relative torsion angle and relative deflection angle of each grid layer of the fuel assembly under test.

2. The method for measuring fuel assembly deformation based on ultrasound according to claim 1, characterized in that, The first tip propagation time includes: a first propagation time and a second propagation time; the first detection distance includes: a first distance and a second distance; The calculation of the first detection distance based on the propagation time of the first tip and the propagation speed includes: The first distance is obtained by calculating based on the first propagation time and propagation speed; The second distance is obtained by calculating based on the second propagation time and propagation speed.

3. The method for measuring fuel assembly deformation based on ultrasound according to claim 2, characterized in that, The endpoint coordinates include: the coordinates of the first tip; The endpoint coordinates are calculated based on the first detection distance, the second detection distance, and the dimensions of the ultrasonic probe mounting bracket, including: The first included angle is calculated based on the first distance, the second distance, and the dimensions of the ultrasonic probe mounting bracket; The coordinates of the first tip are obtained by calculating based on the first included angle and the first distance.

4. The method for measuring fuel assembly deformation based on ultrasound according to claim 3, characterized in that, The endpoint coordinates include: the coordinates of the second tip; The second tip propagation time includes: the third propagation time and the fourth propagation time; the second detection range includes: the third range and the fourth range; The calculation of the second detection distance based on the second tip propagation time and the propagation speed includes: The second included angle is calculated based on the third distance, the fourth distance, and the dimensions of the ultrasonic probe mounting bracket; The coordinates of the second tip are obtained by calculating based on the second included angle and the third distance.

5. The method for measuring fuel assembly deformation based on ultrasound according to claim 4, characterized in that, The calculation based on the endpoint coordinates and the cross-sectional dimensions of the fuel assembly under test to obtain the relative torsional angle of each grid layer of the fuel assembly under test includes: Based on the coordinates of the first tip and the second tip, and combined with the cross-sectional dimensions of the fuel assembly under test, the relative torsional angle of each grid layer of the fuel assembly under test is calculated.

6. The method for measuring fuel assembly deformation based on ultrasound according to claim 1, characterized in that, The measurement of the deformation of the fuel assembly under test based on the relative torsional angle and relative deflection angle of each grid layer of the fuel assembly under test includes: The relative torsion angle and relative deflection angle of each grid layer of the fuel assembly under test are integrated, and the graphic of the part is drawn to obtain the drawing graphic. The deformation of the fuel assembly under test is obtained by comparing and analyzing the drawn graphic with the graphic of the reference fuel assembly.

7. An ultrasonic-based fuel assembly deformation measurement device, characterized in that, include: The signal acquisition unit is used to acquire the ultrasonic detection signals of each grid layer of the fuel assembly under test; The ultrasonic detection signal includes: detection time; the detection time is the time from emitting ultrasonic waves to receiving the reflected signal from the tip; the detection time includes: the first tip propagation time and the second tip propagation time; A torsion angle calculation unit is used to calculate the relative torsion angle of each layer of the fuel assembly under test based on the ultrasonic detection signal of each layer, combined with the cross-sectional dimensions of the fuel assembly under test and the ultrasonic probe information. The ultrasonic probe information includes the propagation speed of ultrasonic waves in the medium and the dimensions of the ultrasonic probe mounting bracket. The calculation of the relative torsion angle of each layer of the fuel assembly under test based on the ultrasonic detection signal of each layer, combined with the cross-sectional dimensions of the fuel assembly under test and the ultrasonic probe information, includes: calculating a first detection distance based on the propagation time of the first tip and the propagation speed; calculating a second detection distance based on the propagation time of the second tip and the propagation speed; calculating endpoint coordinates based on the first detection distance, the second detection distance, and the dimensions of the ultrasonic probe mounting bracket; and calculating the relative torsion angle of each layer of the fuel assembly under test based on the endpoint coordinates and the cross-sectional dimensions of the fuel assembly under test. The deflection angle calculation unit is used to calculate the deflection angle between two adjacent grid layers of the fuel assembly under test, and to obtain the relative deflection angle of each grid layer of the fuel assembly under test. The deformation measurement unit is used to measure the deformation of the fuel assembly under test based on the relative torsion angle and relative deflection angle of each grid layer of the fuel assembly under test.

8. A storage medium, characterized in that, The storage medium stores a computer program adapted for loading by a processor to perform the steps of the ultrasonic-based fuel assembly deformation measurement method as described in any one of claims 1 to 6.

9. An electronic device, characterized in that, It includes a memory and a processor, wherein the memory stores a computer program, and the processor executes the steps of the ultrasonic-based fuel assembly deformation measurement method as described in any one of claims 1 to 6 by calling the computer program stored in the memory.

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