A method and system for cleaning and health diagnosis of a level gauge

Abstract

The present application discloses a method and system for cleaning and health diagnosis of a level gauge, which realizes the cleaning of impurities adhered to a waveguide probe rod. The level gauge cleaning system includes: an ultrasonic transducer 4, an electrical penetration 5, an ultrasonic signal excitation cable 6, and an ultrasonic generator 7; the ultrasonic generator 7 is located outside the reactor pressure vessel, and the ultrasonic transducer 4 is located inside the reactor pressure vessel; the electrical penetration 5 is installed on the reactor pressure vessel for the ultrasonic signal excitation cable 6 to penetrate the reactor pressure vessel; the ultrasonic generator 7 is connected to the ultrasonic transducer 4 through the ultrasonic signal excitation cable 6; the ultrasonic generator 7 converts the commercial power into a high-frequency alternating current signal matching the operating frequency of the ultrasonic transducer 4 to drive the ultrasonic transducer 4 to work; the ultrasonic transducer 4 is fixed on the waveguide probe rod 3 of the guided-wave radar level gauge; the ultrasonic transducer 4 converts the input electric power into mechanical power and transmits it to the waveguide probe rod 3.

Description

Technical Field

[0001] The present invention relates to the technical field of nuclear industry measurement, and more specifically, to a method and system for cleaning and health diagnosis of a level gauge. Background Art

[0002] The high-temperature gas-cooled reactor is a fourth-generation nuclear reactor with inherent safety characteristics, and it is provided with two reactivity control systems that operate independently according to different working principles, namely, the control rod system and the shutdown system of the absorber balls.

[0003] Among them, the structural diagram of the shutdown system of the absorber balls is shown as follows: A large number of boron carbide absorber balls 2 containing graphite (hereinafter simply referred to as absorber balls) are placed in the storage tank 1 of the shutdown system of the absorber balls for terminating the operation of the reactor (i.e., shutdown); A guided-wave radar level gauge (hereinafter simply referred to as a level gauge, and only the primary measurement element of the level gauge, i.e., the guided-wave probe 3, is shown in the figure) is installed in the storage tank 1 for online real-time measurement of the stacking height of the absorber balls 2 in the storage tank 1, giving a level measurement signal and uploading it to the control unit. The control system judges whether the gravity dropping process of the absorber balls 2 during reactor shutdown is normal and whether the process of the absorber balls 2 being recovered to the storage tank 1 by pneumatic conveying during reactor startup is normal based on this, so as to ensure the safe and stable operation of the high-temperature gas-cooled reactor. Figure 1 Shown as: A large number of boron carbide absorber balls 2 containing graphite (hereinafter simply referred to as absorber balls) are placed in the storage tank 1 of the shutdown system of the absorber balls for terminating the operation of the reactor (i.e., shutdown); A guided-wave radar level gauge (hereinafter simply referred to as a level gauge, and only the primary measurement element of the level gauge, i.e., the guided-wave probe 3, is shown in the figure) is installed in the storage tank 1 for online real-time measurement of the stacking height of the absorber balls 2 in the storage tank 1, giving a level measurement signal and uploading it to the control unit. The control system judges whether the gravity dropping process of the absorber balls 2 during reactor shutdown is normal and whether the process of the absorber balls 2 being recovered to the storage tank 1 by pneumatic conveying during reactor startup is normal based on this, so as to ensure the safe and stable operation of the high-temperature gas-cooled reactor. Figure 1 The storage tank 1 is located at the top of the reactor pressure vessel (the container for storing the absorber balls 2 in the shutdown system of the absorber balls and also the installation location of the level gauge). When using a level gauge to measure the stacking height of the absorber balls 2 in the storage tank 1, the guided-wave probe 3 of the level gauge will be in a high-temperature, high-pressure, and high-radiation working environment inside the storage tank 1 (for example, the internal design temperature of the storage tank 1 is 350°C, the working temperature is 250°C, and the maximum working pressure is 7 Mpa); And the absorber balls 2 will undergo friction and wear with themselves and other components during the circulation process, generating graphite dust. After the level gauge works in this high-temperature, high-pressure, and high-radiation environment for a period of time, the graphite dust will sinter and adhere to the guided-wave probe  3, resulting in a change in the impedance of the level measurement signal transmission, and further leading to incorrect level measurement. In severe cases, it will even cause the level gauge to fail.

[0004] In addition, when the level gauge is used in a low-temperature environment, water vapor and impurities in the low-temperature environment will also condense on the guided-wave probe 3, resulting in the generation of false echoes, thus leading to incorrect level measurement.

[0005] In addition, when the level gauge is used in a low-temperature environment, water vapor and impurities in the low-temperature environment will also condense on the guided-wave probe 3, resulting in the generation of false echoes, thus leading to incorrect level measurement. Summary of the Invention

[0006] In view of this, the present invention provides a method and system for cleaning and health diagnosis of a level gauge to actively clean the impurities adhered to the guided-wave probe and ensure the accuracy of level measurement.

[0007] A level gauge cleaning system includes: an ultrasonic transducer 4, an electrical penetration 5, an ultrasonic signal excitation cable 6, and an ultrasonic generator 7;

[0008] Among them, the ultrasonic generator 7 is located outside the reactor pressure vessel, and the ultrasonic transducer 4 is located inside the reactor pressure vessel; the electrical penetration 5 is installed on the reactor pressure vessel for the ultrasonic signal excitation cable 6 to penetrate the reactor pressure vessel; the ultrasonic generator 7 is connected to the ultrasonic transducer 4 through the ultrasonic signal excitation cable 6;

[0009] The ultrasonic generator 7 is used to convert the mains power into a high-frequency alternating current signal matching the operating frequency of the ultrasonic transducer 4 to drive the ultrasonic transducer 4 to work;

[0010] The ultrasonic transducer 4 is fixed on the waveguide probe 3 of the guided wave radar level gauge; the ultrasonic transducer 4 is used to convert the input electric power into mechanical power and transfer it to the waveguide probe 3.

[0011] Optionally, the reactor pressure vessel is located inside the concrete wall 9, and the ultrasonic generator 7 is located outside the concrete wall 9.

[0012] Optionally, the ultrasonic transducer 4 operates at the resonance frequency point.

[0013] Optionally, the level gauge cleaning system further includes: a control unit 11, and the control unit 11 is used to receive a user command and control the ultrasonic generator 7 to drive the ultrasonic transducer 4 to start working regularly according to the start frequency set by the user according to the user command.

[0014] Optionally, the control unit is further used to obtain the actual measurement value of the guided wave radar level gauge after cleaning the impurities adhered to the waveguide probe 3 by using the ultrasonic transducer 4, compare it with the standard value at the current moment calibrated in advance, and judge the measurement accuracy of the guided wave radar level gauge according to the comparison result.

[0015] Optionally, the control unit is further used to output a correction instruction for the guided wave radar level gauge when it is judged according to the comparison result that the measurement accuracy of the guided wave radar level gauge does not meet the requirements, perform a test again after the correction is completed, and report that the guided wave radar level gauge is damaged if it still cannot meet the requirements after multiple corrections.

[0016] A level gauge cleaning method is applied to a level gauge cleaning system, and the level gauge cleaning system includes: an ultrasonic transducer 4, an electrical penetration 5, an ultrasonic signal excitation cable 6, and an ultrasonic generator 7;

[0017] Among them, the ultrasonic generator 7 is located outside the reactor pressure vessel, and the ultrasonic transducer 4 is located inside the reactor pressure vessel; the electrical penetration 5 is installed on the reactor pressure vessel for the ultrasonic signal excitation cable 6 to penetrate the reactor pressure vessel; the ultrasonic generator 7 is connected to the ultrasonic transducer 4 through the ultrasonic signal excitation cable 6;

[0018] The ultrasonic generator 7 is used to convert the mains power into a high-frequency alternating current signal matching the operating frequency of the ultrasonic transducer 4 to drive the ultrasonic transducer 4 to work;

[0019] The ultrasonic transducer 4 is fixed on the waveguide probe 3 of the guided wave radar level gauge; the ultrasonic transducer 4 is used to convert the input electric power into mechanical power and transfer it to the waveguide probe 3;

[0020] The method includes: receiving a user command, and controlling the ultrasonic generator 7 to drive the ultrasonic transducer 4 to start working regularly according to the start frequency set by the user according to the user command.

[0021] A method for health diagnosis of a level gauge includes: after cleaning the impurities adhering to the waveguide probe 3 by using the above-mentioned level gauge cleaning method, obtaining the actual measurement value of the guided wave radar level gauge, comparing it with the standard value at the current moment calibrated in advance, and judging the measurement accuracy of the guided wave radar level gauge according to the comparison result.

[0022] Optionally, after judging the measurement accuracy of the guided wave radar level gauge according to the comparison result, it further includes: when it is judged that the measurement accuracy of the guided wave radar level gauge does not meet the requirements according to the comparison result, outputting a correction instruction for the guided wave radar level gauge, and performing a test again after the correction is completed. If the requirements still cannot be met after multiple corrections, reporting that the guided wave radar level gauge is damaged.

[0023] Optionally, a redundant measurement method is adopted each time the measurement accuracy test is performed.

[0024] It can be seen from the above technical solutions that in the present invention, the ultrasonic generator 7 drives the ultrasonic transducer 4, and the ultrasonic transducer 4 converts the input electric power into mechanical power (i.e., ultrasonic waves) and transfers it to the waveguide probe 3, and uses the strong mechanical vibration generated by the ultrasonic waves to shake off the impurities adhering to the waveguide probe 3 (including impurities caused by high-temperature sintering or low-temperature condensation), thereby achieving the effect of actively cleaning the impurities adhering to the waveguide probe 3 and ensuring that the level gauge measures the level information accurately for a long time. Description of the Drawings

[0025] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the attached drawings required for the description of the embodiments or the prior art. Obviously, the attached drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other attached drawings can also be obtained based on these attached drawings.

[0026] Figure 1 Figure 4 is a schematic structural diagram of an absorption ball shutdown system disclosed in the prior art;

[0027] Figure 2 Figure 8 is a schematic structural diagram of a level gauge cleaning system applied to an absorption ball shutdown system disclosed in an embodiment of the present invention;

[0028] Figure 3 Figure 12 is a schematic structural diagram of another level gauge cleaning system applied to an absorption ball shutdown system disclosed in an embodiment of the present invention;

[0029] Figure 4 Figure 16 is a flowchart of a method for cleaning a level gauge disclosed in an embodiment of the present invention;

[0030] Figure 5 Figure 20 is a flowchart of a method for diagnosing the health of a level gauge disclosed in an embodiment of the present invention;

[0031] Figure 6 Figure 24 is a flowchart of another method for diagnosing the health of a level gauge disclosed in an embodiment of the present invention. Detailed Embodiments

[0032] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the attached drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0033] Refer to Figure 2 , an embodiment of the present invention discloses a level gauge cleaning system, including: an ultrasonic transducer 4, an electrical penetration 5, an ultrasonic signal excitation cable 6, and an ultrasonic generator 7;

[0034] Among them, the ultrasonic generator 7 is located outside the reactor pressure vessel, and the ultrasonic transducer 4 is located inside the reactor pressure vessel; the electrical penetration 5 is installed on the reactor pressure vessel (for example, installed on the top cover 8 of the reactor pressure vessel) for the ultrasonic signal excitation cable 6 to penetrate the reactor pressure vessel; the ultrasonic generator 7 is connected to the ultrasonic transducer 4 through the ultrasonic signal excitation cable 6;

[0035] The ultrasonic generator 7 is used to convert the mains power into a high-frequency alternating current signal that matches the operating frequency of the ultrasonic transducer 4, and drive the ultrasonic transducer 4 to work;

[0036] The ultrasonic transducer 4 is fixed on the waveguide probe 3 of the guided wave radar level gauge; the ultrasonic transducer 4 is used to convert the input electrical power into mechanical power (i.e., ultrasonic waves) and transmit it to the waveguide probe 3.

[0037] Next, the working principle of the embodiment of the present invention will be described in detail:

[0038] There is a reliable electrical and signal connection and transmission between the ultrasonic generator 7 and the ultrasonic transducer 4 through the ultrasonic signal excitation cable 6; the ultrasonic generator 7 is used to convert the mains power into a high-frequency alternating current signal that matches the operating frequency of the ultrasonic transducer 4, and drive the ultrasonic transducer 4 to work; the ultrasonic transducer 4 is fixed on the waveguide probe 3 of the guided wave radar level gauge and is used to convert the input electrical power into mechanical power (i.e., ultrasonic waves) and transmit it to the waveguide probe 3, and the strong mechanical vibration generated by the ultrasonic waves shakes off the impurities adhered to the waveguide probe 3 (including impurities caused by high-temperature sintering or low-temperature condensation), so as to achieve the effect of cleaning the impurities adhered to the waveguide probe 3.

[0039] The ultrasonic transducer 4 has the highest efficiency and is the most stable when working at the resonance frequency point, and can vibrate and shake off impurities efficiently. Different materials, specifications, sizes, and usage environments of the waveguide probe 3 will correspond to different resonance frequencies. Therefore, the embodiment of the present invention recommends querying and determining the frequency of the high-frequency alternating current signal that the ultrasonic generator 7 should output in the database in advance according to the material, specification size, and usage environment conditions of the waveguide probe 3, so as to ensure that the ultrasonic transducer 4 always works at the resonance frequency point.

[0040] The inside of the reactor pressure vessel is a harsh environment area, with a high-temperature, high-pressure, and high-radiation working environment, and general electronic products such as the ultrasonic generator 7 cannot work normally in this environment; the outside of the reactor pressure vessel is a mild environment area, suitable for the installation of the ultrasonic generator 7. Therefore, the embodiment of the present invention installs the ultrasonic generator 7 outside the reactor pressure vessel (still refer to Figure 2, the reactor pressure vessel is located inside the concrete wall 9. The environment outside the concrete wall 9 is at normal temperature and pressure, which is better than the environment inside the concrete wall where the ultrasonic generator 7 is located. Therefore, in the embodiments of the present invention, it is recommended to install the ultrasonic generator 7 outside the concrete wall 9). The ultrasonic generator 7 and the ultrasonic transducer 4 are connected through an ultrasonic signal excitation cable 6. The electrical penetration 5 is a special electrical device installed on the reactor pressure vessel for the ultrasonic signal excitation cable 6 to penetrate the reactor pressure vessel. Under normal and various accident conditions (including earthquakes and loss-of-coolant accidents), the electrical penetration 5 can ensure the integrity of the reactor pressure vessel, prevent radioactive substances from leaking, and at the same time maintain the electrical and signal continuity between the ultrasonic transducer 4 inside and outside the reactor pressure vessel and the ultrasonic generator 7.

[0041] As can be seen from the above description, in the embodiments of the present invention, the ultrasonic generator 7 drives the ultrasonic transducer 4. The ultrasonic transducer 4 converts the input electric power into mechanical power (i.e., ultrasonic waves) and transmits it to the guided wave probe 3. The strong mechanical vibration generated by the ultrasonic waves shakes off the impurities (including those caused by high-temperature sintering or low-temperature condensation) adhering to the guided wave probe 3, thereby achieving the effect of actively cleaning the impurities adhering to the guided wave probe 3 and ensuring the long-term accurate measurement of the level information by the level gauge. The level gauge cleaning system disclosed in the embodiments of the present invention has a simple structure, is stable and reliable, and is suitable for popularization and application.

[0042] Optionally, still referring to Figure 2 , the ultrasonic generator 7 is installed inside the instrument box 10 to avoid damage.

[0043] Optionally, based on any of the above-disclosed embodiments, referring to Figure 3 , the level gauge cleaning system further includes: a control unit 11. The control unit 11 is configured to receive a user command and control the ultrasonic generator 7 to drive the ultrasonic transducer 4 to start working regularly according to the start frequency set by the user according to the user command, thereby achieving active and regular cleaning of the impurities adhering to the guided wave probe 3. The start frequency is set according to actual needs. The start frequency cannot be too large to avoid the situation where when the dirt adhering to the guided wave probe 3 reaches a level that cannot be removed by mechanical vibration, only manual disassembly and maintenance can be adopted; the start frequency cannot be too small to avoid unnecessary cost losses.

[0044] Optionally, based on any of the above disclosed embodiments, the control unit 11 is further configured to, after cleaning the impurities adhering to the waveguide probe 3 by using the ultrasonic transducer 4, obtain the actual measurement value of the guided-wave radar level gauge, compare it with the standard value at the current moment calibrated in advance, and determine the measurement accuracy of the guided-wave radar level gauge according to the comparison result. For example, if the deviation between the actual measurement value and the standard value is less than the preset value, it is determined that the guided-wave radar level gauge has high measurement accuracy; if the deviation between the actual measurement value and the standard value is not less than the preset value, a calibration instruction for the guided-wave radar level gauge is output. After the calibration is completed, the test is carried out again. If the requirement still cannot be met after multiple calibrations, it is reported that the guided-wave radar level gauge is damaged.

[0045] Optionally, each time the measurement accuracy test is carried out, a redundant measurement method can be adopted, that is, the test is carried out based on multiple groups of measurement values simultaneously to increase the test accuracy.

[0046] In summary, the level gauge cleaning system can also be equipped with a test and diagnosis function. The test and diagnosis function can perform a health diagnosis on the level gauge, timely detect the fault defects of the level gauge, so as to ensure the long-term accurate measurement of the level information by the level gauge.

[0047] Corresponding to the above system embodiment, the embodiment of the present invention also discloses a method for cleaning a level gauge, which is applied to the Figure 2 level gauge cleaning system as shown. The level gauge cleaning system includes: an ultrasonic transducer 4, an electrical penetration 5, an ultrasonic signal excitation cable 6, and an ultrasonic generator 7;

[0048] Among them, the ultrasonic generator 7 is located outside the reactor pressure vessel, and the ultrasonic transducer 4 is located inside the reactor pressure vessel; the electrical penetration 5 is installed on the reactor pressure vessel for the ultrasonic signal excitation cable 6 to penetrate the reactor pressure vessel; the ultrasonic generator 7 is connected to the ultrasonic transducer 4 through the ultrasonic signal excitation cable 6;

[0049] The ultrasonic generator 7 is configured to convert the mains power into a high-frequency alternating current signal matching the operating frequency of the ultrasonic transducer 4 and drive the ultrasonic transducer 4 to work;

[0050] The ultrasonic transducer 4 is fixed on the waveguide probe 3 of the guided-wave radar level gauge; the ultrasonic transducer 4 is configured to convert the input electric power into mechanical power and transfer it to the waveguide probe 3;

[0051] As Figure 4 shown, the method includes:

[0052] Step S01: Receive a user command;

[0053] Step S02: Control the ultrasonic generator according to the user command to drive the ultrasonic transducer to start working regularly at the startup frequency set by the user.

[0054] Optionally, the reactor pressure vessel is located inside the concrete wall 9, and the ultrasonic generator 7 is located outside the concrete wall 9.

[0055] Optionally, the ultrasonic transducer 4 works at the resonance frequency point.

[0056] In addition, the embodiment of the present invention also discloses a method for health diagnosis of a level gauge, as Figure 5 shown, including:

[0057] Step S11: After cleaning the impurities adhering to the waveguide probe using the above-mentioned level gauge cleaning method, obtain the actual measurement value of the guided wave radar level gauge;

[0058] Step S12: Compare the actual measurement value with the standard value at the current moment calibrated in advance, and judge the measurement accuracy of the guided wave radar level gauge according to the comparison result.

[0059] In addition, the embodiment of the present invention also discloses another method for health diagnosis of a level gauge, as Figure 6 shown, including:

[0060] Step S21: After cleaning the impurities adhering to the waveguide probe using the above-mentioned level gauge cleaning method, obtain the actual measurement value of the guided wave radar level gauge;

[0061] Step S22: Compare the actual measurement value with the standard value at the current moment calibrated in advance. If the deviation between the two is less than the preset value, go to Step S23; otherwise, if the deviation between the two is not less than the preset value, go to Step S24;

[0062] Step S23: Determine that the measurement accuracy of the guided wave radar level gauge is high, and the control ends here.

[0063] Step S24: Output a calibration instruction for the guided wave radar level gauge. After calibration, perform the test again. If the requirements still cannot be met after multiple calibrations, report that the guided wave radar level gauge is damaged, and the control ends here.

[0064] Optionally, a redundant measurement method is used each time the measurement accuracy test is performed.

[0065] The various embodiments in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. The same or similar parts among the various embodiments can be referred to each other. For the methods disclosed in the embodiments, since they correspond to the systems disclosed in the embodiments, the description is relatively simple, and the relevant parts can be referred to the description of the system part.

[0066] The terms "first", "second", etc. in the description and claims of the present invention and the above-mentioned drawings are used to distinguish similar different objects, and do not necessarily have to be used to describe a specific order or sequence. Moreover, the terms "comprising", "including" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or further includes elements inherent to such process, method, commodity or device. Without further limitation, an element defined by the statement "including one" does not exclude the existence of additional identical elements in the process, method, commodity or device including the element.

[0067] Those skilled in the art can further realize that the units and algorithm steps of each example described in combination with the embodiments disclosed herein can be implemented by electronic hardware, computer software, or a combination of the two. For the sake of clearly illustrating the interchangeability of hardware and software, the composition and steps of each example have been generally described according to functions in the above description. Whether these functions are executed in a hardware or software manner depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods for each specific application to implement the described functions, but such implementation should not be considered to exceed the scope of the present invention.

[0068] The steps of the method or algorithm described in combination with the embodiments disclosed herein can be directly implemented by hardware, software modules executed by a processor, or a combination of the two. The software modules can be placed in a random access memory (RAM), internal 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 well-known in the technical field.

[0069] The system embodiments described above are merely illustrative. The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place, or may be distributed to multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art can understand and implement it without creative efforts.

[0070] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the embodiments of the present invention. Therefore, the embodiments of the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A level meter cleaning system, characterized in that: include: Ultrasonic transducer (4), electrical penetration (5), ultrasonic signal excitation cable (6) and ultrasonic generator (7); The ultrasonic generator (7) is located outside the reactor pressure vessel, and the ultrasonic transducer (4) is located inside the reactor pressure vessel; an electrical penetration piece (5) is installed on the reactor pressure vessel and is used for an ultrasonic signal excitation cable (6) to pass through the reactor pressure vessel; the ultrasonic generator (7) and the ultrasonic transducer (4) are connected via the ultrasonic signal excitation cable (6); The ultrasonic generator (7) is used to convert the mains electricity into a high-frequency alternating current signal that matches the operating frequency of the ultrasonic transducer (4) to drive the ultrasonic transducer (4) to operate; wherein the frequency of the high-frequency alternating current signal output by the ultrasonic generator (7) is determined based on the material, specifications, and operating environment of the waveguide probe (3); The ultrasonic transducer (4) is fixed on the waveguide probe (3) of the waveguide radar level meter; the ultrasonic transducer (4) is used to convert input electrical power into mechanical power and transmit it to the waveguide probe (3); The reactor pressure vessel is located inside the concrete wall (9), and the ultrasonic generator (7) is located outside the concrete wall (9).

2. The material level meter cleaning system according to claim 1, characterized in that: The ultrasonic transducer (4) operates at a resonant frequency point.

3. The material level meter cleaning system according to claim 1, characterized in that: The material level meter cleaning system further comprises: a control unit (11), the control unit (11) being used to receive user commands and, according to the user commands, control the ultrasonic generator (7) to drive the ultrasonic transducer (4) to start operation regularly according to a start-up frequency set by the user.

4. The material level meter cleaning system according to claim 3, characterized in that: The control unit is further used to obtain the actual measurement value of the guided wave radar level meter after cleaning impurities adhered to the guided wave probe (3) using an ultrasonic transducer (4), compare the actual measurement value with a pre-calibrated standard value at the current moment, and determine the measurement accuracy of the guided wave radar level meter based on the comparison result.

5. The material level meter cleaning system according to claim 4, characterized in that: The control unit is further configured to output a correction instruction for the guided wave radar level meter when it is determined based on the comparison result that the measurement accuracy of the guided wave radar level meter does not meet the requirements, and perform another test after the correction is completed. If the requirements are still not met after multiple corrections, the guided wave radar level meter is reported to be damaged.

6. A level meter cleaning method, applied to a level meter cleaning system, characterized in that: The material level meter cleaning system comprises: an ultrasonic transducer (4), an electrical penetration piece (5), an ultrasonic signal excitation cable (6) and an ultrasonic generator (7); The ultrasonic generator (7) is located outside the reactor pressure vessel, and the ultrasonic transducer (4) is located inside the reactor pressure vessel; an electrical penetration piece (5) is installed on the reactor pressure vessel and is used for an ultrasonic signal excitation cable (6) to pass through the reactor pressure vessel; the ultrasonic generator (7) and the ultrasonic transducer (4) are connected via the ultrasonic signal excitation cable (6); The ultrasonic generator (7) is used to convert the mains electricity into a high-frequency alternating current signal that matches the operating frequency of the ultrasonic transducer (4) to drive the ultrasonic transducer (4) to operate; wherein the frequency of the high-frequency alternating current signal output by the ultrasonic generator (7) is determined based on the material, specifications, and operating environment of the waveguide probe (3); The ultrasonic transducer (4) is fixed on the waveguide probe (3) of the waveguide radar level meter; the ultrasonic transducer (4) is used to convert input electrical power into mechanical power and transmit it to the waveguide probe (3); wherein the reactor pressure vessel is located inside the concrete wall (9), and the ultrasonic generator (7) is located outside the concrete wall (9); The method comprises: receiving a user command, and controlling an ultrasonic generator (7) according to the user command to drive an ultrasonic transducer (4) to start operation regularly according to a start frequency set by the user.

7. A level meter health diagnosis method, characterized in that: include: After the impurities adhering to the waveguide probe (3) are cleaned by the level meter cleaning method described in claim 6, the actual measurement value of the waveguide radar level meter is obtained, and the actual measurement value is compared with the pre-calibrated standard value at the current moment, and the measurement accuracy of the waveguide radar level meter is judged based on the comparison result.

8. The material level meter health diagnosis method according to claim 7, characterized in that: After the measurement accuracy of the guided wave radar level meter is determined based on the comparison result, the method further includes: when it is determined based on the comparison result that the measurement accuracy of the guided wave radar level meter does not meet the requirements, outputting a correction instruction for the guided wave radar level meter, performing a test again after the correction is completed, and reporting that the guided wave radar level meter is damaged if the requirements are still not met after multiple corrections.

9. The material level meter health diagnosis method according to claim 8, characterized in that: Every time measurement accuracy is tested, redundant measurements are taken.

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