A vibration and abrasion coupled fuel rod damage test device and test method

Abstract

The application provides a vibration and abrasion coupled fuel rod damage test device and test method, relates to the technical field of nuclear energy equipment safety evaluation and wear test, and comprises a vibration test assembly, the vibration test assembly is used for mounting a fuel rod to be tested and driving vibration of the fuel rod to be tested; and an abrasion test assembly, the abrasion test assembly is arranged in the vibration test assembly and is used for cooperating with the vibration test assembly to synchronously perform vibration abrasion test and abrasion scouring test on the fuel rod to be tested. Through coupling of environment simulation and motion simulation, the vibration abrasion test and the abrasion scouring test are synchronously performed, the problem of insufficient coupling field simulation of a traditional test device is effectively solved, the real operation working condition of a nuclear fuel rod is closer, and therefore the damage condition of the fuel rod is more accurately obtained.

Description

Technical Field

[0001] This invention relates to the field of nuclear energy equipment safety assessment and wear testing technology, and in particular to a test device and method for testing fuel rod damage coupled with vibration and erosion. Background Technology

[0002] Nuclear fuel assemblies are the core components of a nuclear reactor, and their structural integrity and long-term reliability directly affect the reactor's safe operation and economic efficiency. During reactor operation, fuel assemblies are subjected to harsh environments of high temperature, high pressure, strong radiation, and high-flow-rate coolant. Vibrations caused by coolant flow, earthquakes, and other factors can lead to wear between the fuel assemblies and structural components such as the positioning grids. This wear is one of the main causes of fuel rod cladding erosion and even failure, potentially leading to radioactive material leaks and seriously threatening nuclear safety.

[0003] For a long time, assessing and predicting fuel rod wear has relied primarily on limited operational experience, numerical simulations, and simplified bench tests. Currently, nuclear fuel assembly wear testing equipment falls into two main categories: environmental simulation and motion simulation. Environmental simulation test chambers aim to reproduce the aquatic environment of the reactor loop, typically integrating an autoclave and circulating water loop to investigate the degradation behavior of materials under the combined effects of wear and corrosion. Motion simulation test chambers focus on reproducing the micro-motion modes (such as sliding and impact) caused by fluid vibrations between the fuel rods and the positioning grid. They achieve independent control of displacement, frequency, and trajectory through high-precision actuators. Both types of equipment simplify the actual motion conditions of the fuel rods, making it difficult to recreate the actual environment in which fuel rods are subjected to abrasion and erosion.

[0004] Therefore, there is an urgent need for a fuel rod damage testing device that can simultaneously reproduce the vibration and abrasion environment of fuel rods in order to simulate the actual motion conditions of fuel rods in the reactor and thus obtain more accurate information about the damage to fuel rods. Summary of the Invention

[0005] The purpose of this invention is to address the above problems by providing a test apparatus and method for testing fuel rod damage coupled with vibration and erosion.

[0006] In a first aspect, the present invention provides a fuel rod damage testing apparatus coupled with vibration and erosion, comprising: A vibration testing assembly, which is used to mount the fuel rod to be tested and drive it to vibrate; An abrasion testing component is disposed inside the vibration testing component and is used to cooperate with the vibration testing component to simultaneously perform vibration abrasion testing and abrasion erosion testing on the fuel rod to be tested.

[0007] According to certain embodiments of the present invention, the vibration testing assembly includes a support frame, and The mounting frame is disposed inside the support frame, and multiple positioning grids are arranged sequentially at intervals along a first direction inside the mounting frame; A clamping drive assembly is disposed on the top surface of the support frame and is used to clamp the fuel rod to be tested, so that it passes through the mounting holes coaxially corresponding to the positioning grid in sequence and vibrates within the mounting holes.

[0008] According to the technical solutions provided in certain embodiments of the present invention, the abrasion testing assembly includes: The filter housing is provided with a test space between the filter housing and the mounting bracket. The test space contains abrasive particles, and at least one of the positioning grids is disposed inside the test space. The filter housing is used to filter and block the abrasive particles inside the test space. A pumping component, the output end of which is connected to the interior of the receiving filter element, is used to pump liquid into the receiving filter element to drive the abrasive particles to dynamically scour the fuel rod under test within the test space.

[0009] According to certain embodiments of the present invention, the filter element includes: The receiving portion has an open top and a closed bottom, and the output end of the pumping element is located inside the receiving portion; A filter section is provided circumferentially along the top opening of the receiving section and is fixedly connected to the inner wall of the mounting bracket. The filter section has multiple filter holes and at least one guide hole. The diameter of the filter holes is smaller than the diameter of the abrasive particles, and the diameter of the guide hole is larger than the diameter of the fuel rod to be tested, for through-mounting the fuel rod to be tested.

[0010] According to the technical solutions provided in some embodiments of the present invention, the vibration testing assembly further includes: A guide drive is disposed between the support frame and the mounting bracket, and is used to drive the mounting bracket to slide along a second direction on the support frame to adjust the radial relative distance between the fuel rod to be tested and the inner wall of the mounting hole of the positioning grid; the second direction is perpendicular to the first direction, and the diameter of the mounting hole is larger than the diameter of the fuel rod to be tested.

[0011] According to certain embodiments of the present invention, the vibration testing assembly further includes an adjustment mechanism, the adjustment mechanism comprising: Two guide members extend along a first direction and are respectively arranged parallel to each other on two opposite side walls of the mounting frame, and are slidably connected to at least one of the positioning grids; At least one adjustment drive is provided on the mounting bracket and is pulsatorically connected to at least one of the positioning grids, for driving the positioning grids to move along a first direction on the guide to adjust the spacing between adjacent positioning grids.

[0012] According to the technical solutions provided in some embodiments of the present invention, the clamping drive assembly includes: A first-direction clamping drive assembly is used to clamp and drive the fuel rod to be tested to move along a first direction. The second direction vibration drive assembly is slidably disposed on the top surface of the support frame along the second direction and slidably connected to the first direction clamping drive assembly along the third direction, for driving the first direction clamping drive assembly to move along the second direction and providing vibration drive force along the second direction. The third-direction vibration drive assembly is slidably disposed on the top surface of the support frame along the third direction and slidably connected to the first-direction clamping drive assembly along the second direction. It is used to drive the first-direction clamping drive assembly to move along the third direction and to provide vibration drive force along the third direction. The third direction is perpendicular to the plane containing the first direction and the second direction.

[0013] According to the technical solutions provided in certain embodiments of the present invention, both the second-direction vibration driving component and the third-direction vibration driving component include: A vibration assembly includes a sliding limiting plate and a vibrating element fixedly connected to each other, the vibrating element being slidably connected to the support frame; a first-direction clamping drive assembly is slidably connected to the sliding limiting plate, the sliding limiting plate having a through sliding limiting groove, the sliding limiting groove of the second-direction vibration drive assembly and the sliding limiting groove of the third-direction vibration drive assembly being perpendicular to each other and having an overlapping area, the first-direction clamping drive assembly being disposed through the overlapping area, and the vibrating element transmitting the vibration driving force to the first-direction clamping drive assembly through the sliding limiting plate; A movable component is fixedly mounted on the support frame, and the output end of the movable component is connected to the vibrating component to drive the vibrating component to move.

[0014] Secondly, the present invention provides a method for testing fuel rod damage coupled with vibration and erosion, comprising: S1: Obtain test vibration load parameters, test abrasion load parameters, and test boundary constraint load parameters; S2: Place abrasive particles of the target size and concentration into the containment according to the test abrasive load parameters; S3: Control the second-direction vibration drive assembly, the third-direction vibration drive assembly, the first-direction clamping drive assembly, the guide drive component, and the adjustment drive component according to the test boundary constraint load parameters to adjust the fuel rod to be tested to the test installation position; S4: Control the second-direction vibration drive component and the third-direction vibration drive component to drive the fuel rod under test to vibrate along the preset motion trajectory according to the test vibration load parameters and test boundary constraint load parameters to form a vibration test field; Simultaneously, start the pumping component according to the test abrasion load parameters to pump liquid into the housing at the target water flow scouring speed, and drive the abrasive particles to scour the fuel rod under test to form an abrasive erosion field. S5: Record the abrasion parameters of the fuel rod under test under the synchronous action of the vibration test field and the abrasive erosion field.

[0015] According to the technical solutions provided in certain embodiments of the present invention, the test vibration load parameters, test abrasion load parameters, and test boundary constraint load parameters are obtained by decomposing the load spectrum of the test condition. Accordingly, the method further includes: Monitor the actual vibration load parameters, actual abrasion load parameters, and actual boundary constraint load parameters of the fuel rod under test in the vibration test field and abrasive erosion field; Based on the test vibration load parameters, test abrasion load parameters, test boundary constraint load parameters, and actual vibration load parameters, actual abrasion load parameters, and actual boundary constraint load parameters, calculate the vibration deviation, abrasion deviation, and boundary constraint condition deviation. The test vibration load parameters, test abrasion load parameters, and test boundary constraint load parameters are dynamically adjusted based on the vibration deviation, abrasion deviation, and boundary constraint condition deviation.

[0016] In summary, this invention provides a fuel rod damage testing device coupled with vibration and erosion, comprising a vibration testing component for mounting the fuel rod to be tested and driving its vibration; and an erosion testing component disposed inside the vibration testing component for cooperating with the vibration testing component to simultaneously perform vibration erosion testing and erosion scouring testing on the fuel rod to be tested. By coupling environmental simulation with motion simulation and simultaneously performing vibration erosion testing and erosion scouring testing, the problem of insufficient coupled field simulation in traditional testing devices is effectively solved, more closely resembling the actual operating conditions of nuclear fuel rods, thereby obtaining a more accurate assessment of the fuel rod damage.

[0017] It should be understood that the descriptions of technical features, technical solutions, beneficial effects, or similar language in this invention do not imply that all features and advantages can be achieved in any single embodiment. Rather, it is understood that the description of a feature or beneficial effect means that a specific technical feature, technical solution, or beneficial effect is included in at least one embodiment. Therefore, the descriptions of technical features, technical solutions, or beneficial effects in this specification do not necessarily refer to the same embodiment. Furthermore, the technical features, technical solutions, and beneficial effects described in this embodiment can be combined in any suitable manner. Those skilled in the art will understand that embodiments can be implemented without one or more specific technical features, technical solutions, or beneficial effects of a particular embodiment. In other embodiments, additional technical features and beneficial effects may be identified in specific embodiments that do not embody all embodiments. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 A schematic diagram of a fuel rod damage testing device coupled with vibration and erosion provided in an embodiment of the present invention; Figure 2 A cross-sectional schematic diagram of a fuel rod damage testing device coupled with vibration and erosion provided in an embodiment of the present invention; Figure 3 This is a schematic diagram of the abrasion testing assembly provided in an embodiment of the present invention; Figure 4 This is a schematic diagram of the structure of the guide drive component provided in an embodiment of the present invention; Figure 5 This is a schematic diagram of the structure of the adjustment drive provided in an embodiment of the present invention; Figure 6 This is a schematic diagram of the clamping drive assembly provided in an embodiment of the present invention; Figure 7 This is a schematic diagram of the structure of the second-direction vibration driving assembly provided in an embodiment of the present invention; Figure 8 This is a schematic diagram of the structure of the first-direction clamping drive assembly provided in an embodiment of the present invention; Figure 9 This is a schematic diagram of the clamping part provided in an embodiment of the present invention; Figure 10 This is a schematic flowchart of a vibration-erosion coupled fuel rod damage test method provided in an embodiment of the present invention.

[0020] The text labels in the image represent: 1. Vibration testing assembly; 11. Mounting bracket; 111. Viewing window; 12. Positioning grid; 13. Clamping drive assembly; 131. First direction clamping drive assembly; 1311. Clamping component; 1312. Drive component; 1313. Connecting plate; 1314. Anti-loosening nut; 13111. Sliding frame; 13112. Limiting component; 132. Second direction vibration drive assembly; 133. Third direction vibration drive assembly; 14. Guide drive component; 141. Guide drive part; 142. Sliding part; 143. Locking part; 15. Adjustment mechanism; 151. Guide component; 152. Adjustment drive component; 1523. Adjustment drive unit; 1524. Drive gear; 1525. Transmission shaft; 1526. Driven gear; 1527. Ball screw assembly; 1528. Transition gear; 16. Support frame; 2. Abrasion test assembly; 21. Filter housing; 211. Housing; 212. Filter unit; 22. Pumping component; 3. Controller; 4. Eye bolt; a. Vibration assembly; a1. Sliding limit plate; a2. Vibration component; b. Moving component. Detailed Implementation

[0021] To enable those skilled in the art to better understand the technical solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. This description is merely illustrative and explanatory, and should not be construed as limiting the scope of protection of the present invention in any way. Specifically, the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort should fall within the scope of protection of the present invention.

[0022] It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such process, method, product, or apparatus.

[0023] As mentioned in the background section, in view of the problems in the prior art, this embodiment provides a fuel rod damage testing device coupled with vibration and erosion, comprising: Vibration test assembly 1 is used to install the fuel rod to be tested and drive its vibration. Abrasion test component 2 is located inside vibration test component 1 and is used in conjunction with vibration test component 1 to synchronously perform vibration abrasion test and abrasion erosion test on the fuel rod under test.

[0024] For details, please refer to Figure 1 , Figure 2 and Figure 3 The vibration-erosion coupled fuel rod damage testing device includes a vibration testing component 1 and an erosion testing component 2. Vibration testing component 1 is used to mount the fuel rod to be tested and drive it to vibrate for vibration-erosion testing. The erosion testing component 2 is located inside vibration testing component 1 and works in conjunction with it to simultaneously perform erosion-scouring tests on the fuel rod under test while vibration-erosion testing is being conducted on vibration testing component 1. In addition, the testing device includes a controller 3, which is electrically connected to vibration testing component 1 and is used to control the magnitude and direction of the driving force output by vibration testing component 1.

[0025] This invention combines a vibration testing component with an abrasion testing component to simultaneously perform vibration abrasion testing and abrasion erosion testing on the fuel rod under test. This enables the reproduction of the coupled test conditions of vibration and abrasive erosion, solving the problem of insufficient simulation of the coupled field in traditional test devices. It is closer to the actual operating conditions of nuclear fuel rods, thus obtaining more accurate nuclear fuel damage information.

[0026] In a preferred embodiment, the vibration testing assembly 1 includes a support frame 16, and Mounting bracket 11 is disposed inside the support frame 16, and multiple positioning grids 12 are arranged sequentially at intervals along the first direction inside the mounting bracket 11; The clamping drive assembly 13 is disposed on the top surface of the support frame 16 and is used to clamp the fuel rod to be tested, so that it passes through the mounting holes coaxially corresponding to the multiple positioning grids 12 in sequence and vibrates within the mounting holes.

[0027] Specifically, such as Figure 1 and Figure 2As shown, the vibration testing assembly 1 includes a support frame 16, a mounting frame 11, positioning grids 12, and a clamping drive assembly 13. The support frame 16 is a rectangular frame structure, used to provide a mounting base for other components of the vibration-erosion coupled fuel rod damage testing device. Furthermore, the support frame 16 has reinforcing ribs on its sides to enhance structural rigidity, reduce the risk of damage to the testing device during testing, and improve the stability and reliability of the testing device. Additionally, the top of the support frame 16 is equipped with lifting eye bolts 4, facilitating the overall lifting and transportation of the vibration-erosion coupled fuel rod damage testing device. The mounting frame 11 is located inside the support frame 16. Multiple positioning grids 12 are sequentially spaced along a first direction inside the mounting frame 11, and each positioning grid 12 has mounting holes. The first direction is... Figure 2 The Z-axis direction. In this embodiment, there are three positioning grids 12, but the number of positioning grids 12 can be adjusted according to the test requirements, and no specific limitation is made here. The clamping drive assembly 13 is disposed on the top surface of the support frame 16 and is used to clamp the fuel rod to be tested, so that it passes through the mounting holes corresponding to each other on the multiple positioning grids 12 in sequence and vibrates within the mounting holes to perform vibration abrasion test. In addition, for the convenience of operation and observation, a viewing window 111 is embedded in the mounting frame 11 to facilitate observation of the test process.

[0028] In a preferred embodiment, the abrasion test assembly 2 includes: The filter element 21 is accommodated, and a test space is formed between the filter element 21 and the mounting frame 11. Abrasive particles are disposed inside the test space, and at least one positioning grid 12 is disposed inside the test space. The filter element 21 is used to filter and block the abrasive particles inside the test space. The pumping component 22 has its output end connected to the interior of the receiving filter element 21, and is used to pump liquid into the receiving filter element 21 to drive abrasive particles to dynamically scour the fuel rod under test within the test space.

[0029] Specifically, such as Figure 2 and Figure 3As shown, the abrasion test assembly 2 includes a receiving filter element 21 and a pump element 22. A test space is formed between the receiving filter element 21 and the mounting frame 11, and abrasive particles are disposed within the test space. At least one positioning grid 12 is disposed within the test space to ensure that vibration abrasion testing and abrasion erosion testing can be performed simultaneously within the test space. The receiving filter element 21 filters and isolates abrasive particles within the test space to ensure the stability of the test conditions within the test space. The output end of the pump element 22 is connected to the interior of the receiving filter element 21, and the input end of the pump element 22 is below the output end and penetrates through the outer wall of the mounting frame to connect to the interior of the mounting frame. During use, liquid enters the receiving filter element 21 from the input end of the pump element 22 through the output end, driving the abrasive particles to dynamically scour the fuel rod under test within the test space. In this embodiment, the pump element 22 is a water pump, and the liquid is water.

[0030] In a preferred embodiment, the filter housing 21 includes: The receiving part 211 has an open top and a closed bottom, and the output end of the pumping member 22 is located inside the receiving part 211. The filter section 212 is arranged circumferentially along the top opening of the receiving section 211 and is fixedly connected to the inner wall of the mounting bracket 11. The filter section 212 has multiple filter holes and at least one guide hole. The diameter of the filter holes is smaller than the diameter of the abrasive particles, and the diameter of the guide hole is larger than the diameter of the fuel rod to be tested, for through-installation of the fuel rod to be tested.

[0031] Specifically, such as Figure 3 As shown, the receiving filter element 21 includes a receiving portion 211 and a filtering portion 212. The receiving portion 211 is open at the top and closed at the bottom, with the output end of the pumping element 22 located inside the receiving portion 211. The filtering portion 212 is circumferentially arranged along the top opening of the receiving portion 211 and is fixedly connected to the inner wall of the mounting bracket 11. The filtering portion 212 has multiple filter holes and at least one guide hole (not shown in the figure). The diameter of the filter holes is smaller than the diameter of the abrasive particles to prevent the abrasive particles from leaking from the test space. The diameter of the guide hole is larger than the diameter of the fuel rod to be tested and is used to install the fuel rod to be tested through it. It should be noted that since the diameter of the guide hole is larger than that of the fuel rod to be tested and the abrasive particles, there is a possibility that the abrasive particles may leak from the guide hole. However, since the number of guide holes is small, the leakage of abrasive particles is also relatively small, and the pumping element 22 will continuously pump water and leaked particles into the test space, so the change in the number of abrasive particles is very small and will not affect the stability of the test conditions. In this embodiment, the receiving part 211 is a conical sealed-bottom funnel, and the filtering part 212 is a 304 stainless steel mesh. Before the test begins, the sealed-bottom funnel is used to contain abrasive particles.

[0032] In a preferred embodiment, the vibration testing assembly 1 further includes: The guide drive 14 is disposed between the support frame 16 and the mounting frame 11, and is used to drive the mounting frame 11 to slide along the second direction on the support frame 16, and to adjust the radial relative distance between the fuel rod to be tested and the inner wall of the mounting hole of the positioning grid 12; the second direction is perpendicular to the first direction, and the diameter of the mounting hole is larger than the diameter of the fuel rod to be tested.

[0033] Specifically, such as Figure 2 and Figure 4 As shown, the vibration testing assembly 1 also includes a guide drive component 14, which includes a guide drive part 141, a sliding part 142 extending along a second direction, and a locking part 143. The sliding part 142 is fixedly disposed on the bottom surface of the support frame 16 and slidably connected to the bottom surface of the mounting frame 11. The guide drive part 141 is disposed on the bottom surface of the support frame 16, and its output end is connected to the bottom surface of the mounting frame 11. It is used to drive the mounting frame 11 to slide along the second direction on the sliding part 142 to adjust the radial relative distance between the fuel rod to be tested and the inner wall of the mounting hole of the positioning grid 12, thereby changing the initial boundary conditions between the fuel rod and the positioning grid 12 (such as a non-contact state or a pre-compression state). The diameter of the mounting hole is larger than the diameter of the fuel rod to be tested, providing sufficient space for the adjustment of the radial relative distance between the two, ensuring smooth implementation of the adjustment function. The second direction is perpendicular to the first direction, providing... Figure 2 The X-axis direction is shown. Locking parts 143 are located on both sides of the sliding part 142, used to fix the relative position of the mounting bracket 11 and the support frame 16. In this embodiment, the sliding part 142 is a slide rail. The guide drive part 141 is a servo motor. The locking component is a hinged bolt-ring nut locking mechanism; other locking mechanisms with equivalent fixing effects, such as bolt tightening or snap-locking, can also be used, and no specific limitation is made here.

[0034] In a preferred embodiment, the vibration testing assembly 1 further includes an adjustment mechanism 15, which includes: Two guide members 151 extend along a first direction and are respectively arranged parallel to each other on two opposite side walls of the mounting frame 11, and are slidably connected to at least one positioning grid frame 12. At least one adjustment drive 152 is disposed on the mounting bracket 11 and is connected to at least one positioning grid 12 for driving the positioning grid 12 to move along a first direction on the guide 151 to adjust the spacing between adjacent positioning grids 12.

[0035] Specifically, such as Figure 2As shown, the vibration testing assembly 1 also includes an adjustment mechanism 15. The adjustment mechanism 15 includes two guide members 151 and at least one adjustment drive member 152. The two guide members 151 extend along a first direction and are respectively arranged parallel to each other on two opposite side walls of the mounting frame 11, and are slidably connected to at least one positioning grid 12. The adjustment drive member 152 is disposed on the mounting frame 11 and is drively connected to at least one positioning grid 12, used to drive the positioning grid 12 to move along the first direction on the guide members 151, thereby adjusting the spacing between adjacent positioning grids 12 to accommodate fuel rods of different lengths to be tested, and simultaneously simulating the spacing conditions of different levels of support in actual operation of nuclear fuel assemblies. In this embodiment, the guide member 151 is a slide rail. There are two adjustment drive members 152, each connected to one of the two positioning grids 12. Specifically, as... Figure 5 As shown, the adjustment drive component 152 includes: an adjustment drive part 1523, which is disposed on the outer wall of the mounting bracket 11, and a drive gear 1524 is disposed on its output shaft; a transmission shaft 1525, which is rotatably disposed on the inner wall of the mounting bracket 11 and extends along a first direction, and a driven gear 1526 is sleeved on one end of the transmission shaft 1525 away from the bottom surface of the mounting bracket 11; and a ball screw assembly 1527, which is rotatably disposed on the inner wall of the mounting bracket 11 and coaxially fixedly connected to the end of the transmission shaft 1525 away from the driven gear 1526, and the ball screw assembly is connected to the positioning grid 12. A transition gear 1528 is disposed between the drive gear 1524 and the driven gear 1526, and meshes synchronously with both gears to transmit the driving force of the adjustment drive unit 1523 to the positioning grid 12. In this embodiment, the adjustment drive unit 1523 is a servo motor.

[0036] In a preferred embodiment, the clamping drive assembly 13 includes: The first direction clamping drive assembly 131 is used to clamp and drive the fuel rod to be tested to move along the first direction. The second-direction vibration drive assembly 132 is slidably disposed on the top surface of the support frame 16 along the second direction and slidably connected to the first-direction clamping drive assembly 131 along the third direction. It is used to drive the first-direction clamping drive assembly 131 to move along the second direction and to provide vibration drive force along the second direction. The third-direction vibration drive assembly 133 is slidably disposed on the top surface of the support frame 16 along the third direction and slidably connected to the first-direction clamping drive assembly 131 along the second direction. It is used to drive the first-direction clamping drive assembly 131 to move along the third direction and to provide vibration driving force along the third direction. The third direction is perpendicular to the plane containing the first direction and the second direction.

[0037] Specifically, such as Figure 2 and Figure 6 As shown, the clamping drive assembly 13 includes a first-direction clamping drive assembly 131, a second-direction vibration drive assembly 132, and a third-direction vibration drive assembly 133. The first-direction clamping drive assembly 131 clamps and drives the fuel rod to be tested to move along the first direction. The second-direction vibration drive assembly 132 is slidably disposed on the top surface of the support frame 16 via a slide rail extending along the second direction, and is slidably connected to the first-direction clamping drive assembly 131 via a slide rail extending along the third direction, for driving the first-direction clamping drive assembly 131 to move along the second direction and providing vibration driving force along the second direction. The third-direction vibration drive assembly 133 is slidably disposed on the top surface of the support frame 16 via a slide rail extending along the third direction, and is slidably connected to the first-direction clamping drive assembly 131 via a slide rail extending along the second direction, for driving the first-direction clamping drive assembly 131 to move along the third direction and providing vibration driving force along the third direction; the third direction is perpendicular to the plane containing the first and second directions. The first-direction clamping drive assembly 131, the second-direction vibration drive assembly 132, and the third-direction vibration drive assembly 133 work together to position the fuel rod to be tested at the test installation position. The second-direction vibration drive assembly 132 and the third-direction vibration drive assembly 133 output vibration driving force, causing the fuel rod to vibrate in the XY plane. The third direction is... Figure 2 In the Y-axis direction.

[0038] In a preferred embodiment, both the second-direction vibration driving component 132 and the third-direction vibration driving component 133 include: Vibration component a includes a sliding limiting plate a1 and a vibrating element a2 that are fixedly connected to each other. The vibrating element a2 is slidably connected to the support frame 16. A first-direction clamping drive component 131 is slidably connected to the sliding limiting plate a1. A sliding limiting groove is provided through the sliding limiting plate a1. The sliding limiting groove of the second-direction vibration drive component 132 and the sliding limiting groove of the third-direction vibration drive component 133 are perpendicular to each other and have an overlapping area. The first-direction clamping drive component 131 is provided through the overlapping area. The vibrating element a2 transmits vibration driving force to the first-direction clamping drive component through the sliding limiting plate a1. The movable component b is fixedly mounted on the support frame 16. The output end of the movable component b is connected to the vibrating component a2 and is used to drive the vibrating component a2 to move.

[0039] Specifically, such as Figure 7 As shown, both the second-direction vibration drive assembly 132 and the third-direction vibration drive assembly 133 are composed of a vibration assembly a and a moving component b. The vibration assembly a includes a sliding limiting plate a1 and a vibrating component a2, which are fixedly connected to each other. The vibrating component a2 is slidably connected to the support frame 16, and the first-direction clamping drive assembly 131 is slidably connected to the sliding limiting plate a1. A sliding limiting groove is provided through the sliding limiting plate a1, and the sliding limiting grooves of the second-direction vibration drive assembly 132 and the third-direction vibration drive assembly 133 are perpendicular to each other and have an overlapping area. The first-direction clamping drive assembly 131 is disposed through this overlapping area. The vibrating component a2 can transmit vibration driving force to the first-direction clamping drive assembly 131 through the sliding limiting plate a1, while the orthogonally distributed sliding limiting grooves ensure that the vibrations in the two directions do not interfere with each other. The movable component b is fixedly mounted on the support frame 16, and its output end is connected to the vibrating component a2. It is used to drive the vibrating component a2 to move the entire vibration assembly a, thereby realizing the position adjustment of the first-direction clamping drive assembly 131 in the second or third direction. Among them, the movable component b is a servo motor, and the vibrating component a2 is a TMEC cylindrical voice coil motor.

[0040] In addition, such as Figure 7 , Figure 8 and Figure 9As shown, the first-direction clamping drive assembly 131 includes a clamping member 1311 and a drive member 1312. The drive member 1312 is slidably connected to the sliding limit plate a1 of the second-direction vibration drive assembly 132 via a connecting plate 1313, and is also slidably connected to the sliding limit plate a1 of the third-direction vibration drive assembly 133 via the connecting plate 1313. The output end of the drive member 1312 is connected to the clamping member 1311 and is used to drive the clamping member 1311 to move along the first direction. This allows it to cooperate with the second-direction vibration drive assembly 132 and the third-direction vibration drive assembly 133, enabling the fuel rod to be tested to pass through the coaxial mounting holes of each positioning grid 12. It can also move the clamping member 1311 according to the test requirements to adjust the position of the fuel rod to be tested in the first direction. The clamping member 1311 includes a clamping part and a sliding part. The clamping part is cylindrical and has a clamping hole inside that matches the outer diameter of the fuel rod to be tested, allowing it to fit tightly against the outer wall of the fuel rod to achieve a stable clamping. The clamping part is equipped with an anti-loosening nut 1314. Tightening the anti-loosening nut 1314 can further lock the fuel rod under test, preventing it from loosening or shifting during vibration and abrasion tests and ensuring the positional stability of the fuel rod under test during the test. The sliding part is a rectangular frame structure, with one end fixedly connected to the clamping part and the other end slidably connected to the driving component 1312. The sliding part includes a sliding frame 13111 and a limiting component 13112. Slide rails are provided on both side walls of the sliding frame 13111. The limiting component 13112 is slidably connected to the slide rails and engages with the connecting plate 1313, limiting the deflection of the sliding frame 13111 during movement, thereby preventing the fuel rod under test from shifting.

[0041] This embodiment also provides a method for testing fuel rod damage coupled with vibration and erosion, such as... Figure 10 As shown, it includes: S1: Obtain test vibration load parameters, test abrasion load parameters, and test boundary constraint load parameters; Specifically, the test vibration load parameters, test abrasion load parameters, and test boundary constraint load parameters can be set independently to investigate their influence and patterns on fuel rod damage. Alternatively, a load spectrum of the actual operating conditions can be input into the device, which then decomposes this spectrum into the test vibration load parameters, test abrasion load parameters, and test boundary constraint load parameters. The test vibration load parameters include vibration direction and vibration mode. The test abrasion load parameters include the particle size of abrasive particles, the concentration of abrasive particles, and the water flow erosion velocity. The test boundary constraint load parameters include radial relative distance and support span.

[0042] S2: Place abrasive particles of the target particle size and concentration into the containment 211 according to the test abrasive load parameters; Specifically, abrasive particles of the target size and concentration are placed in the containment section 211 to simulate the environment in which solid particles carried in the reactor coolant scour the fuel rods under test. By selecting abrasive particles of different sizes (such as micron-sized oxide particles) and concentrations, the actual operating conditions of different reactor types and different operating stages can be matched. Therefore, the specific particle size and concentration can be determined according to the test requirements (the actual operating conditions to be simulated), and are not specifically limited here.

[0043] S3: Control the second-direction vibration drive assembly 132, the third-direction vibration drive assembly 133, the first-direction clamping drive assembly 131, the guide drive component 14, and the adjustment drive component 152 according to the test boundary constraint load parameters to adjust the fuel rod to be tested to reach the test installation position. Specifically, by controlling the second-direction vibration drive assembly 132, the third-direction vibration drive assembly 133, and the first-direction clamping drive assembly 131, the fuel rod to be tested is moved in the X and Y planes and raised and lowered in the Z direction, so that the fuel rod to be tested is aligned with the coaxial mounting holes on the multiple positioning grids 12. The guide drive 14 drives the mounting frame 11 to slide in the second direction (X-axis direction), adjusting the radial relative distance between the fuel rod to be tested and the inner wall of the mounting hole of the positioning grid 12 to the target radial relative distance. By adjusting the drive 152, the positioning grid 12 is moved in the first direction (Z-axis direction), adjusting the spacing between adjacent positioning grids 12 to match the target support span, at which point the fuel rod to be tested reaches the test installation position.

[0044] S4: Based on the test vibration load parameters and the test boundary constraint load parameters, control the second direction vibration drive component 132 and the third direction vibration drive component 133 to drive the fuel rod under test to vibrate along the preset motion trajectory to form a vibration test field; Simultaneously, based on the test abrasion load parameters, start the pumping component 22 to pump liquid into the housing 211 at the target water flow scouring speed, drive the abrasive particles to scour the fuel rod under test, and form an abrasive erosion field; Specifically, the second-direction vibration drive component 132 and the third-direction vibration drive component 133 are controlled to drive the fuel rods to vibrate along a preset motion trajectory, forming a vibration test field simulating the micro-motion of reactor fuel rods. The preset trajectory can be a sinusoidal frequency sweep, narrowband random, or a time-domain reproducible signal based on the measured core vibration spectrum, etc., and can be selected according to the test requirements; no specific limitation is made here. Simultaneously, the pumping component 22 is activated to pump liquid into the containment section 211 at a target water flow scouring speed. The water flow causes abrasive particles to float and form an abrasive particle region of a specific concentration. The water flow carries the abrasive particles to scour the fuel rods under test, thereby simulating the abrasive erosion field of coolant flow erosion. The water flow scouring speed can be adjusted according to the test requirements; no specific limitation is made here.

[0045] S5: Record the erosion parameters of the fuel rod under test under the simultaneous action of vibration test field and abrasive erosion field.

[0046] Specifically, the abrasion parameters of the fuel rod under test under the simultaneous action of the vibration test field and the abrasive erosion field can be recorded in real time using a high-speed camera through the viewing window 111 of the mounting bracket 11. This records the vibration attitude of the fuel rod, the dynamic scouring trajectory of the abrasive particles, and the contact process between the fuel rod and the inner wall of the mounting hole of the positioning grid. Furthermore, according to the experimental data acquisition requirements, micro-force sensors, laser displacement gauges, and other detection elements are installed on the clamping component 1311 or the positioning grid 12 to monitor parameters such as contact stress, radial relative displacement, vibration amplitude, and frequency of the fuel rod under test under the coupled field, providing reliable data support for subsequent analysis of the damage to the fuel rod.

[0047] In a preferred embodiment, the test vibration load parameters, test abrasion load parameters, and test boundary constraint load parameters are obtained by decomposing the load spectrum of the test condition. Accordingly, the method further includes: Monitor the actual vibration load parameters, actual abrasion load parameters, and actual boundary constraint load parameters of the fuel rod under test in the vibration test field and abrasive erosion field; Based on the test vibration load parameters, test abrasion load parameters, test boundary constraint load parameters, and actual vibration load parameters, actual abrasion load parameters, and actual boundary constraint load parameters, calculate the vibration deviation, abrasion deviation, and boundary constraint condition deviation. The test vibration load parameters, test abrasion load parameters, and test boundary constraint load parameters are dynamically adjusted based on vibration deviation, abrasion deviation, and boundary constraint condition deviation.

[0048] Specifically, actual vibration load parameters are monitored using a laser sensor, actual abrasion load parameters using a flow velocity sensor, and actual boundary constraint load parameters using a force sensor. Based on the decomposed test vibration load parameters, test abrasion load parameters, test boundary constraint load parameters, and actual vibration load parameters, actual abrasion load parameters, and actual boundary constraint load parameters, vibration deviation, abrasion deviation, and boundary constraint condition deviation are calculated. The test vibration load parameters, test abrasion load parameters, and test boundary constraint load parameters are dynamically adjusted based on the vibration deviation, abrasion deviation, and boundary constraint condition deviation, forming a closed-loop control system of monitoring-feedback-adjustment.

[0049] This invention, through the cooperation of a vibration testing component and an abrasion testing component, simultaneously conducts vibration abrasion tests and abrasion erosion tests, achieving the reproduction of coupled experimental conditions of the synergistic effect of the vibration field and the abrasive erosion field. Specifically, the vibration testing component drives the fuel rod under test to vibrate, simulating the vibration conditions in a reactor; the abrasion testing component pumps liquid into a container via a pumping unit, carrying abrasive particles of a preset size and concentration, simulating the abrasion erosion environment in a reactor. This overcomes the shortcomings of traditional experimental devices, which often perform single vibration tests or single environment simulations and lack sufficient coupled field simulation. It makes the experimental environment closer to the actual operating conditions of nuclear fuel rods in a reactor, thus enabling more accurate acquisition of the damage to the fuel rods under coupled effects.

[0050] To facilitate understanding by those skilled in the art, the workflow of the vibration-erosion coupled fuel rod damage testing device provided by the present invention is as follows: The fuel rod to be tested is installed into the first-direction clamping drive assembly 131. Test vibration load parameters, test abrasion load parameters, and test boundary constraint load parameters are acquired. Based on the test abrasion load parameters, abrasive particles of the target particle size and concentration are placed into the receiving portion 211 of the receiving filter 21. Based on the test boundary constraint load parameters, the second-direction vibration drive assembly 132, the third-direction vibration drive assembly 133, the first-direction clamping drive assembly 131, the guide drive 14, and the adjusting drive 152 are controlled to adjust the fuel rod to the test installation position. Based on the test vibration load parameters and the test boundary constraint load parameters, the second-direction vibration drive assembly 132 and the third-direction vibration drive assembly 133 are controlled to drive the fuel rod to vibrate via the sliding limit plate a1, forming a vibration test field. Simultaneously, based on the test abrasion load parameters, the pump 22 is activated to pump liquid into the receiving portion 211, causing the abrasive particles to scour the fuel rod to form an abrasive erosion field. The abrasion parameters of the fuel rod under the simultaneous action of the vibration test field and the abrasive erosion field are recorded.

[0051] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention. The above descriptions are only preferred embodiments of the present invention. It should be noted that due to the limitations of textual expression, and the objective existence of infinite specific structures, those skilled in the art can make several improvements, modifications, or changes without departing from the principles of the present invention, and can also combine the above technical features in an appropriate manner; these improvements, modifications, changes, or combinations, or the direct application of the inventive concept and technical solution to other situations without modification, should all be considered within the scope of protection of the present invention.

Claims

1. A test apparatus for fuel rod damage coupled with vibration and erosion, characterized in that, include Vibration test assembly (1), which is used to install the fuel rod to be tested and drive it to vibrate; Abrasion test component (2) is disposed inside the vibration test component (1) and is used to cooperate with the vibration test component (1) to perform vibration abrasion test and abrasion erosion test on the fuel rod to be tested simultaneously.

2. The fuel rod damage testing device coupled with vibration and erosion according to claim 1, characterized in that, The vibration testing assembly (1) includes a support frame (16), and Mounting bracket (11) is disposed inside the support frame (16), and multiple positioning grids (12) are arranged sequentially at intervals along the first direction inside the mounting bracket (11). The clamping drive assembly (13) is disposed on the top surface of the support frame (16) and is used to clamp the fuel rod to be tested, so that it passes through the mounting holes coaxially corresponding to the positioning grid (12) in sequence and vibrates in the mounting holes.

3. The fuel rod damage testing device coupled with vibration and erosion according to claim 2, characterized in that, The abrasion test assembly (2) includes: The filter (21) is provided, and a test space is formed between the filter (21) and the mounting bracket (11). The test space is provided with abrasive particles, and at least one of the positioning grids (12) is provided inside the test space. The filter (21) is used to filter and block the abrasive particles inside the test space. The pumping component (22) has its output end connected to the interior of the receiving filter (21) and is used to pump liquid into the interior of the receiving filter (21) to drive the abrasive particles to dynamically scour the fuel rod to be tested inside the test space.

4. The fuel rod damage testing device coupled with vibration and erosion according to claim 3, characterized in that, The filter housing (21) includes: The receiving part (211) is open at the top and closed at the bottom, and the output end of the pumping member (22) is located inside the receiving part (211); A filter section (212) is arranged circumferentially along the top opening of the receiving section (211) and is fixedly connected to the inner wall of the mounting bracket (11). The filter section (212) has a plurality of filter holes and at least one guide hole. The diameter of the filter holes is smaller than the diameter of the abrasive particles, and the diameter of the guide hole is larger than the diameter of the fuel rod to be tested, for through-installation of the fuel rod to be tested.

5. The fuel rod damage testing device coupled with vibration and erosion according to claim 2, characterized in that, The vibration testing assembly (1) also includes: A guide drive (14) is disposed between the support frame (16) and the mounting bracket (11) for driving the mounting bracket (11) to slide along the second direction on the support frame (16) to adjust the radial relative distance between the fuel rod to be tested and the inner wall of the mounting hole of the positioning grid (12); the second direction is perpendicular to the first direction, and the diameter of the mounting hole is larger than the diameter of the fuel rod to be tested.

6. The fuel rod damage testing device coupled with vibration and erosion according to claim 2, characterized in that, The vibration testing assembly (1) further includes an adjustment mechanism (15), which includes: Two guide members (151) extend along a first direction and are respectively arranged parallel to each other on two opposite side walls of the mounting frame (11) and are slidably connected to at least one of the positioning grids (12); At least one adjustment drive (152) is disposed on the mounting bracket (11) and is convexly connected to at least one of the positioning grids (12) for driving the positioning grids (12) to move along a first direction on the guide (151) to adjust the spacing between adjacent positioning grids (12).

7. The fuel rod damage testing device coupled with vibration and erosion according to claim 5, characterized in that, The clamping drive assembly (13) includes: The first direction clamping drive assembly (131) is used to clamp and drive the fuel rod to be tested to move along the first direction; The second direction vibration drive assembly (132) is slidably disposed on the top surface of the support frame (16) along the second direction and slidably connected to the first direction clamping drive assembly (131) along the third direction, for driving the first direction clamping drive assembly (131) to move along the second direction and providing vibration drive force along the second direction. The third-direction vibration drive assembly (133) is slidably disposed on the top surface of the support frame (16) along the third direction and slidably connected to the first-direction clamping drive assembly (131) along the second direction. It is used to drive the first-direction clamping drive assembly (131) to move along the third direction and to provide vibration drive force along the third direction. The third direction is perpendicular to the plane containing the first direction and the second direction.

8. The fuel rod damage testing device coupled with vibration and erosion according to claim 7, characterized in that, Both the second-direction vibration drive assembly (132) and the third-direction vibration drive assembly (133) include: A vibration assembly (a) includes a sliding limiting plate (a1) and a vibrating element (a2) fixedly connected to each other. The vibrating element (a2) is slidably connected to the support frame (16). A first-direction clamping drive assembly (131) is slidably connected to the sliding limiting plate (a1). A sliding limiting groove is provided through the sliding limiting plate (a1). The sliding limiting groove of the second-direction vibration drive assembly (132) and the sliding limiting groove of the third-direction vibration drive assembly (133) are perpendicular to each other and have an overlapping area. The first-direction clamping drive assembly (131) is provided through the overlapping area. The vibrating element (a2) transmits the vibration driving force to the first-direction clamping drive assembly through the sliding limiting plate (a1). The movable component (b) is fixedly mounted on the support frame (16). The output end of the movable component (b) is connected to the vibrating component (a2) and is used to drive the vibrating component (a2) to move.

9. A method for testing fuel rod damage coupled with vibration and erosion, characterized in that, The method is implemented using the test apparatus as described in any one of claims 1-8, and includes: S1: Obtain test vibration load parameters, test abrasion load parameters, and test boundary constraint load parameters; S2: Place the abrasive particles of the target size and concentration into the container (211) according to the test abrasive load parameters. S3: Control the second direction vibration drive assembly (132), the third direction vibration drive assembly (133), the first direction clamping drive assembly (131), the guide drive component (14), and the adjustment drive component (152) according to the test boundary constraint load parameters to adjust the fuel rod to be tested to the test installation position; S4: Control the second-direction vibration drive component (132) and the third-direction vibration drive component (133) to drive the fuel rod under test to vibrate along the preset motion trajectory according to the test vibration load parameters and test boundary constraint load parameters to form a vibration test field; Simultaneously, start the pumping component (22) according to the test abrasion load parameters to pump liquid into the housing (211) at the target water flow scouring speed, drive the abrasive particles to scour the fuel rod under test, and form an abrasive erosion field; S5: Record the abrasion parameters of the fuel rod under test under the synchronous action of the vibration test field and the abrasive erosion field.

10. The test method according to claim 9, characterized in that, The test vibration load parameters, test abrasion load parameters, and test boundary constraint load parameters are obtained by decomposing the load spectrum of the test condition. Accordingly, the method further includes: Monitor the actual vibration load parameters, actual abrasion load parameters, and actual boundary constraint load parameters of the fuel rod under test in the vibration test field and abrasive erosion field; Based on the test vibration load parameters, test abrasion load parameters, test boundary constraint load parameters, and actual vibration load parameters, actual abrasion load parameters, and actual boundary constraint load parameters, calculate the vibration deviation, abrasion deviation, and boundary constraint condition deviation. The test vibration load parameters, test abrasion load parameters, and test boundary constraint load parameters are dynamically adjusted based on the vibration deviation, abrasion deviation, and boundary constraint condition deviation.

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