Research pile earthquake monitoring system and method

Abstract

The invention relates to the technical field of research reactor earthquake monitoring, and provides a research reactor earthquake monitoring system and method, and the system comprises a plurality of collection ends, a plurality of digital strong motion instruments, and a terminal cabinet. Each acquisition end acquires an acceleration sensing signal of each monitoring point and transmits the acceleration sensing signal to each corresponding digital strong motion seismograph; each digital strong-motion seismograph converts the acceleration sensing signal into an acceleration digital signal, judges whether to generate single-monitoring-point alarm data according to the acceleration digital signal, and transmits the single-monitoring-point alarm data to the terminal cabinet when the single-monitoring-point alarm data is generated; and the terminal cabinet calculates a response spectrum and / or a cumulative absolute speed according to the alarm data of the single monitoring point, judges whether to generate stack stop alarm data or not according to the response spectrum and / or the cumulative absolute speed, and gives an alarm when the stack stop alarm data is generated. According to the system provided by the invention, the accuracy of earthquake monitoring is improved, and false triggering heap stop is prevented.

Description

Technical Field

[0001] This application relates to the field of research reactor seismic monitoring technology, specifically to a research reactor seismic monitoring system and method. Background Technology

[0002] According to relevant nuclear safety regulations, nuclear power plants must be equipped with seismic monitoring systems. Seismic monitoring systems are a key technological means to ensure the safety of large-scale buildings and equipment classified as Class I earthquake-resistant. These systems measure and record ground motion data in real time during earthquakes and analyze the seismic response of buildings and equipment, providing fundamental support for subsequent safety assessments and accident analyses.

[0003] Specifically, the earthquake monitoring system monitors the ground motion status within the nuclear power plant area in real time, as well as the seismic response data of large buildings such as research reactors; it stores the collected data in a standard format; and it analyzes the stored data when an earthquake occurs, calculating key parameters such as peak acceleration, cumulative absolute velocity (CAV), acceleration response spectrum, and velocity response spectrum to provide a scientific and accurate basis for adjusting the operation of the research reactor.

[0004] However, existing earthquake monitoring systems have significant design flaws in actual operation: because earthquake signals are easily affected by non-seismic factors such as environmental vibrations and sensor noise, earthquake monitoring systems often experience signal misinterpretation. Misidentifying non-seismic signals as seismic signals and triggering unnecessary alarms not only interferes with normal judgment but also leads to unnecessary operational adjustments to the research reactor, affecting the stability and safety of the reactor's operation.

[0005] Therefore, there is an urgent need to design a research reactor seismic monitoring system and method that can accurately identify the authenticity of seismic signals and reduce misjudgments. Summary of the Invention

[0006] To address the aforementioned issues, this application provides a research reactor seismic monitoring system and method to reduce unnecessary alarms triggered due to misjudgment.

[0007] The technical solution adopted in this application is as follows: In a first aspect, this application provides a research reactor seismic monitoring system, the system comprising: multiple acquisition terminals, multiple digital strong motion meters that are communicatively connected to each acquisition terminal, and a terminal cabinet that is communicatively connected to each digital strong motion meter; Each acquisition terminal is used to acquire the acceleration sensing signal of each monitoring point and transmit the acceleration sensing signal to the corresponding digital strong motion meter. Each digital strong-motion meter is used to convert the acceleration sensing signal into an acceleration digital signal, determine whether to generate single monitoring point alarm data based on the acceleration digital signal, and transmit the single monitoring point alarm data to the terminal cabinet when generating single monitoring point alarm data. The terminal cabinet is used to calculate the response spectrum and / or cumulative absolute velocity based on alarm data from a single monitoring point, determine whether to generate stack stop alarm data based on the response spectrum and / or cumulative absolute velocity, and issue an alarm when stack stop alarm data is generated.

[0008] Optionally, each acquisition end is a triaxial accelerometer; Each triaxial accelerometer is used to collect X-axis, Y-axis, and Z-axis acceleration sensing signals at each monitoring point, and transmits the X-axis, Y-axis, and Z-axis acceleration sensing signals to the corresponding digital strong-motion seismometer.

[0009] Optionally, each digital strong-motion seismometer includes: a data acquisition module, a processor, a judgment module, a remote communication module, and a primary power supply; The data acquisition module is used to acquire the acceleration sensing signal from the corresponding acquisition end and transmit the acceleration sensing signal to the processor. The processor is used to convert the acceleration sensing signal into a digital acceleration signal and transmit the digital acceleration signal to the judgment module; The judgment module is used to perform a first comparison between the digital acceleration signal and the acceleration sensing threshold, and determine whether to generate single monitoring point alarm data based on the first comparison result. The remote communication module is used to transmit the alarm data of a single monitoring point to the terminal cabinet when generating alarm data for a single monitoring point. The first power supply is used to power the data acquisition module, processor, judgment module, remote communication module and corresponding acquisition terminal.

[0010] Optional, the terminal cabinet includes: a network switch, a data processing terminal, a data communication interface, a display unit, and a second power supply; A network switch is used to acquire alarm data from a single monitoring point and transmit the alarm data from the single monitoring point to a data processing terminal. The data processing terminal is used to calculate the reaction spectrum and / or cumulative absolute velocity based on alarm data from a single monitoring point, perform a second comparison between the reaction spectrum and the reaction spectrum threshold and / or the cumulative absolute velocity and the cumulative absolute velocity threshold, and determine whether to generate stack shutdown alarm data based on the second comparison result. The data communication interface is used to send an alarm to the main control room when generating stack stop alarm data; The display unit is used to display stack stop alarm data; The second power supply is used to power the network switch, data processing terminal, data communication interface and display unit.

[0011] Optionally, each digital strong-motion seismometer also includes: a channel verification module and a remote communication module; The channel inspection module is used to monitor the bias voltage of the corresponding acquisition terminal, compare the bias voltage with the reference value range, and check the first working state of the corresponding acquisition terminal based on the third comparison result. When the first working state is abnormal, the corresponding acquisition terminal is marked. The remote communication module is used to transmit the first tag from the acquisition end to the terminal cabinet.

[0012] Optionally, the terminal cabinet may also include: a channel inspection unit and a data communication interface; The channel inspection unit is used to monitor the bias voltage of the acquisition terminal corresponding to the alarm data of a single monitoring point. It performs a fourth comparison with the historical bias voltage fluctuation range of the corresponding acquisition terminal, and checks the second working state of the corresponding acquisition terminal based on the fourth comparison result. When the second working state is abnormal, the alarm data of the single monitoring point is removed and the corresponding acquisition terminal is marked in the second way. The data communication interface is used to transmit the first tag and / or the second tag of the acquisition end to the main control room.

[0013] Optionally, each digital strong-motion seismometer also includes: a data storage module; The data storage module is used to store in real time the acceleration sensor signals, acceleration digital signals, and analysis data for determining whether to generate single monitoring point alarm data from the corresponding acquisition end. And / or, the terminal cabinet also includes: a data storage unit; The data storage unit is used to store alarm data from a single monitoring point, response spectrum and / or cumulative absolute velocity, and analytical data for determining whether a reactor shutdown alarm has been generated in real time.

[0014] Optional, terminal cabinet, for: If the alarm data for a single monitoring point comes from a free-field monitoring point; Calculate the velocity response spectrum in the 1-2 Hz band and the acceleration response spectrum in the 2-10 Hz band for the X-axis, Y-axis, and Z-axis digital acceleration signals, respectively; determine whether the velocity response spectrum in any direction exceeds the larger value between the design velocity response spectrum and 15.24 cm / s; determine whether the acceleration response spectrum in any direction exceeds the larger value between the design acceleration response spectrum and 0.2g. If the velocity response spectrum in any direction exceeds the larger of the design velocity response spectrum or 15.24 cm / s, and the acceleration response spectrum in any direction exceeds the larger of the design acceleration response spectrum or 0.2 g, then the response spectrum exceeds the limit. Calculate the cumulative absolute velocity of the digital acceleration signals in the X, Y, and Z directions respectively; determine whether the cumulative absolute velocity in any direction exceeds 0.16 g·sec. If the cumulative absolute velocity in any direction exceeds 0.16 g·sec, the cumulative absolute velocity exceeds the limit. If the reaction spectrum exceeds the limit and the cumulative absolute velocity exceeds the limit, a stack shutdown alarm will be generated.

[0015] Optional, terminal cabinet, for: If the alarm data for a single monitoring point comes from the basic monitoring points in the factory building; Calculate the velocity response spectrum in the 1-2 Hz band and the acceleration response spectrum in the 2-10 Hz band for the X-axis, Y-axis, and Z-axis digital acceleration signals, respectively; determine whether the velocity response spectrum in any direction exceeds the larger value between the design velocity response spectrum and 15.24 cm / s; determine whether the acceleration response spectrum in any direction exceeds the larger value between the design acceleration response spectrum and 0.2g. If any velocity response spectrum exceeds the greater of the design velocity response spectrum or 15.24 cm / s, and any acceleration response spectrum exceeds the greater of the design acceleration response spectrum or 0.2g, then a stack shutdown alarm will be generated.

[0016] Secondly, this application provides a method for seismic monitoring of a research reactor, implemented by a research reactor seismic monitoring system, the method comprising: Acceleration sensor signals are collected from monitoring points; The acceleration sensor signal is converted into a digital acceleration signal, and the digital acceleration signal is used to determine whether to generate alarm data for a single monitoring point. When generating alarm data for a single monitoring point, the response spectrum and / or cumulative absolute velocity are calculated based on the alarm data for the single monitoring point. The system then determines whether to generate a stack shutdown alarm based on the response spectrum and / or cumulative absolute velocity. An alarm is triggered when stack shutdown alarm data is generated.

[0017] The above-mentioned technical solution adopted in this application can achieve the following beneficial effects: The research reactor seismic monitoring system provided in this application comprises multiple acquisition terminals located at different positions, each acquiring acceleration sensor signals from various monitoring points. Each acquisition terminal is communicatively connected to a corresponding digital strong-motion seismograph (DMS). The DMS converts the acceleration sensor signals acquired by its corresponding acquisition terminal into digital acceleration signals and performs a false seismic signal determination. When a true seismic signal is detected, a single-monitoring-point alarm data is generated and transmitted to the terminal cabinet. Each DMS is also communicatively connected to the terminal cabinet, which calculates the response spectrum and cumulative absolute velocity of the single-monitoring-point alarm data to ultimately determine whether a reactor shutdown alarm has been triggered. Operators decide whether to shut down the reactor based on the alarm results, improving the accuracy of seismic monitoring and preventing false shutdowns. Furthermore, the reactor shutdown alarm results allow operators to understand and verify the rationality of the seismic design of Class I seismic-resistant buildings and equipment, or determine whether post-earthquake inspections are necessary. Attached Figure Description

[0018] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings: Figure 1 This diagram illustrates the structure of a research reactor seismic monitoring system according to an embodiment of this application; Figure 2 This diagram illustrates the structure of a research reactor seismic monitoring system according to another embodiment of this application; Figure 3 A schematic flowchart of a research reactor seismic monitoring method according to an embodiment of this application is shown; Figure 4 A schematic flowchart of a research reactor seismic monitoring method according to another embodiment of this application is shown. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0020] Figure 1 A schematic diagram of the structure of a research reactor seismic monitoring system according to an embodiment of this application is shown. The system of this embodiment includes: multiple acquisition terminals 1, multiple digital strong-motion seismometers 2 respectively communicatively connected to each acquisition terminal 1, and a terminal cabinet 3 communicatively connected to each digital strong-motion seismometer 2.

[0021] Each acquisition terminal 1 is used to acquire the acceleration sensing signal of each monitoring point and transmit the acceleration sensing signal to the corresponding digital strong vibration meter 2. Each digital strong vibration meter 2 is used to convert the acceleration sensing signal into an acceleration digital signal, determine whether to generate single monitoring point alarm data based on the acceleration digital signal, and transmit the single monitoring point alarm data to the terminal cabinet 3 when generating single monitoring point alarm data. Terminal cabinet 3 is used to calculate the reaction spectrum and / or cumulative absolute velocity based on the alarm data of a single monitoring point, determine whether to generate stack stop alarm data based on the reaction spectrum and / or cumulative absolute velocity, and issue an alarm when stack stop alarm data is generated.

[0022] Reference Figure 1 As shown, multiple acquisition terminals 1 are set up in different locations to acquire acceleration sensing signals from various monitoring points. Each acquisition terminal 1 is communicatively connected to a corresponding digital strong-motion seismograph 2. The digital strong-motion seismograph 2 converts the acceleration sensing signals acquired by the corresponding acquisition terminal 1 into digital acceleration signals and performs a genuine / false earthquake signal determination on the digital acceleration signals. When a genuine earthquake signal is determined, a single monitoring point alarm data is generated and transmitted to the terminal cabinet 3. Each digital strong-motion seismograph 2 is communicatively connected to the terminal cabinet 3. The terminal cabinet 3 calculates the response spectrum and cumulative absolute velocity of the single monitoring point alarm data and ultimately determines whether a grounding alarm has been triggered. Operators decide whether to ground the equipment based on the grounding alarm result, improving the accuracy of earthquake monitoring and preventing false grounding alarms. In addition, through the grounding alarm result, operators can understand and verify whether the seismic design of Class I earthquake-resistant buildings and equipment is reasonable, or determine whether post-earthquake inspections are necessary.

[0023] Figure 2 A schematic diagram of the structure of a research reactor seismic monitoring system proposed in another embodiment of this application is shown.

[0024] In some optional implementations, each acquisition end 1 is a triaxial acceleration sensor 11; each triaxial acceleration sensor 11 is used to acquire the X-axis acceleration sensing signal, Y-axis acceleration sensing signal and Z-axis acceleration sensing signal of each monitoring point respectively, and transmit the X-axis acceleration sensing signal, Y-axis acceleration sensing signal and Z-axis acceleration sensing signal to each corresponding digital strong vibration meter 2 respectively.

[0025] Reference Figure 2 As shown, each acquisition end 1 is a triaxial acceleration sensor 11, used to acquire acceleration sensing signals in the X, Y, and Z directions. The horizontal axis of each acquisition end 1 is parallel to the orthogonal coordinate axes assumed during seismic analysis.

[0026] The acquisition end 1 of the free field monitoring point is installed on a concrete block, which is buried underground to increase rigidity. Preferably, the acquisition end 1 of the free field monitoring point is installed at the center of the upper surface of the concrete block to reduce motion in the angular degree of freedom.

[0027] The data acquisition terminal 1 of the plant's basic monitoring point can be installed on the floor of the nuclear island backup battery charging equipment room, on both sides of the steam generator compartment inside the containment building, or inside the shielded plant building.

[0028] In some optional implementations, each digital strong-motion seismometer 2 includes: a data acquisition module 21, a processor 22, a judgment module 23, a remote communication module 24, and a first power supply 25; the data acquisition module 21 is used to acquire the acceleration sensing signal of the corresponding acquisition terminal 1 and transmit the acceleration sensing signal to the processor 22; the processor 22 is used to convert the acceleration sensing signal into an acceleration digital signal and transmit the acceleration digital signal to the judgment module 23; the judgment module 23 is used to perform a first comparison between the acceleration digital signal and the acceleration sensing threshold, and determine whether to generate single monitoring point alarm data based on the first comparison result; the remote communication module 24 is used to transmit the single monitoring point alarm data to the terminal cabinet 3 when generating single monitoring point alarm data; the first power supply 25 is used to supply power to the data acquisition module 21, the processor 22, the judgment module 23, the remote communication module 24, and the corresponding acquisition terminal 1.

[0029] Reference Figure 2 As shown, each digital strong-motion seismometer 2 can be installed next to the corresponding acquisition terminal 1 and communicate with the corresponding acquisition terminal 1 via a cable. Each digital strong-motion seismometer 2 includes: a data acquisition module 21, a processor 22, a judgment module 23, a remote communication module 24, and a first power supply 25.

[0030] The data acquisition module 21 can acquire acceleration sensing signals from the corresponding acquisition terminal 1 at sampling intervals and transmit them to the processor 22.

[0031] The processor 22 can perform A / D conversion on the analog acceleration sensing signal to obtain a digital acceleration signal and transmit it to the judgment module 23.

[0032] The judgment module 23 can preset the acceleration sensing threshold, compare the acceleration digital signal with the acceleration sensing threshold for the first time, and generate single monitoring point alarm data when the acceleration digital signal exceeds the acceleration sensing threshold. The single monitoring point alarm data includes at least the acceleration digital signal and the first comparison result.

[0033] The remote communication module 24 enables data transmission. Specifically, when the judgment module 23 generates alarm data for a single monitoring point, the alarm data for that single monitoring point is transmitted to the terminal cabinet 3.

[0034] The first power supply 25 provides power to the data acquisition module 21, processor 22, judgment module 23, remote communication module 24, and corresponding acquisition terminal 1. The first power supply 25 can be installed in the terminal cabinet 3. In the event of the loss of other external power sources, the other modules of each digital strong-motion seismometer 2 and the corresponding acquisition terminal 1 can be provided with uninterrupted power for at least 72 hours by the first power supply 25.

[0035] In some optional embodiments, the terminal cabinet 3 includes: a network switch 31, a data processing terminal 32, a data communication interface 33, a display unit 34, and a second power supply 35; the network switch 31 is used to acquire alarm data from a single monitoring point and transmit the alarm data from the single monitoring point to the data processing terminal 32; the data processing terminal 32 is used to calculate the response spectrum and / or cumulative absolute velocity based on the alarm data from the single monitoring point, perform a second comparison between the response spectrum and a response spectrum threshold and / or between the cumulative absolute velocity and a cumulative absolute velocity threshold, and determine whether to generate a stack stop alarm based on the second comparison result; the data communication interface 33 is used to send an alarm to the main control room 4 when stack stop alarm data is generated; the display unit 34 is used to display the stack stop alarm data; and the second power supply 35 is used to supply power to the network switch 31, the data processing terminal 32, the data communication interface 33, and the display unit 34.

[0036] Reference Figure 2 As shown, the terminal cabinet 3 houses a network switch 31, a data processing terminal 32, a data communication interface 33, a display unit 34, and a second unit. The terminal cabinet 3 provides protection for the network switch 31, the data processing terminal 32, the data communication interface 33, the display unit 34, and the second power supply 35.

[0037] The network switch 31 can be connected to the remote communication module 24 of each digital strong-motion meter 2 to obtain alarm data from a single monitoring point and transmit it to the data processing terminal 32.

[0038] Data processing terminal 32 performs in-depth analysis based on alarm data from a single monitoring point to determine whether to generate reactor shutdown alarm data. Specifically, it presets a reaction spectrum threshold and a cumulative absolute velocity threshold; calculates the reaction spectrum and / or cumulative absolute velocity based on the alarm data from the single monitoring point, and performs a second comparison between the reaction spectrum and the reaction spectrum threshold and / or between the cumulative absolute velocity and the cumulative absolute velocity threshold; when the reaction spectrum exceeds the reaction spectrum threshold and / or the cumulative absolute velocity exceeds the cumulative absolute velocity threshold, reactor shutdown alarm data is generated.

[0039] Data communication interface 33 enables data transmission. Specifically, when the data processing terminal 32 generates stack shutdown alarm data, the stack shutdown alarm data is transmitted to the main control room 4. The stack shutdown alarm data includes at least single monitoring point alarm data, response spectrum and / or cumulative absolute velocity and second comparison results.

[0040] Display unit 34 displays data. Display unit 34 can be a monitor or printer, and can at least view or print out the stack stop alarm data, so that on-duty personnel can view or analyze various data.

[0041] The second power supply 35 provides power to the network switch 31, data processing terminal 32, data communication interface 33, and display unit 34. The second power supply 35 can be located within the terminal cabinet 3, ensuring uninterrupted power supply for at least 30 minutes to other units in the terminal cabinet 3 in the event of a loss of other external power sources.

[0042] In some optional implementations, each digital strong-motion seismometer 2 further includes: a channel verification module 26 and a remote communication module 24; the channel verification module 26 is used to monitor the bias voltage of the corresponding acquisition terminal 1, perform a third comparison between the bias voltage and the reference value range, and verify the first working state of the corresponding acquisition terminal 1 according to the third comparison result. When the first working state is abnormal, the corresponding acquisition terminal 1 is marked with a first mark; the remote communication module 24 is used to transmit the first mark of the acquisition terminal 1 to the terminal cabinet 3.

[0043] In some optional implementations, the terminal cabinet 3 further includes: a channel inspection unit 36 ​​and a data communication interface 33; the channel inspection unit 36 ​​is used to monitor the bias voltage of the acquisition terminal 1 corresponding to the alarm data of a single monitoring point, compare the bias voltage with the historical bias voltage fluctuation range of the corresponding acquisition terminal 1 for the fourth time, and check the second working state of the corresponding acquisition terminal 1 according to the fourth comparison result. When the second working state is abnormal, the alarm data of the single monitoring point is removed and the corresponding acquisition terminal 1 is marked for the second time; the data communication interface 33 is used to transmit the first mark and / or the second mark of the acquisition terminal 1 to the main control room 4.

[0044] Reference Figure 2 As shown, each digital strong-motion seismometer 2 also includes a channel inspection module 26. The terminal cabinet 3 also includes a channel inspection unit 36. The channel inspection module 26 and the channel inspection unit 36 ​​can perform dual inspection of the working status of the corresponding acquisition terminal 1.

[0045] The channel inspection module 26 can preset a reference value range. It performs a third comparison between the bias voltage of the corresponding acquisition terminal 1 and the reference value range. When the bias voltage exceeds the reference value range, it checks the first operating state of the corresponding acquisition terminal 1 as abnormal, marks the corresponding acquisition terminal 1 with a first flag, and transmits the first flag of acquisition terminal 1 to the terminal cabinet 3 via the remote communication module 24. If the corresponding acquisition terminal 1 is marked with a first flag, the digital strong-motion seismometer 2 will no longer perform the analysis process of whether to generate single-monitoring-point alarm data.

[0046] After the first marker of the acquisition terminal 1 is transmitted to the terminal cabinet 3, the channel inspection unit 36 ​​of the terminal cabinet 3 does not need to perform a secondary inspection on the corresponding acquisition terminal 1. Instead, it can directly transmit the first marker of the acquisition terminal 1 to the main control room 4 through the data communication interface 33, so that the operators in the main control room 4 can perform a functional check on the corresponding acquisition terminal 1.

[0047] The channel inspection unit 36 ​​can preset the historical bias voltage fluctuation range of each acquisition terminal 1 (the historical bias voltage fluctuation range of each acquisition terminal 1 can be determined by collecting the historical bias voltage of each acquisition terminal 1). When the digital strong vibration meter 2 corresponding to acquisition terminal 1 generates single monitoring point alarm data and transmits it to the terminal cabinet 3, the bias voltage monitored by the channel inspection module 26 is also transmitted to the terminal cabinet 3. The channel inspection unit 36 ​​performs a fourth comparison between the bias voltage and the historical bias voltage fluctuation range of the corresponding acquisition terminal 1. When the bias voltage exceeds the historical bias voltage fluctuation range, the second working state of the corresponding acquisition terminal 1 is checked for abnormality. The corresponding acquisition terminal 1 is marked with a second mark, and the second mark of acquisition terminal 1 is transmitted to the main control room 4 through the data communication interface 33 so that the operators in the main control room 4 can perform functional checks on the corresponding acquisition terminal 1.

[0048] Since the second operational status check of acquisition terminal 1 is performed in terminal cabinet 3, terminal cabinet 3 must have already received the single monitoring point alarm data of the corresponding acquisition terminal 1. If the corresponding acquisition terminal 1 performs a second marking, terminal cabinet 3 will remove the single monitoring point alarm data of the corresponding acquisition terminal 1 and will no longer perform the analysis process of whether to generate stack stop alarm data.

[0049] In some optional embodiments, each digital strong-motion seismometer 2 further includes: a data storage module 27; the data storage module 27 is used to store in real time the acceleration sensing signal, acceleration digital signal and analysis data for determining whether a single monitoring point alarm data is generated from the corresponding acquisition terminal 1; and / or, the terminal cabinet 3 further includes: a data storage unit 37; the data storage unit 37 is used to store in real time the single monitoring point alarm data, response spectrum and / or cumulative absolute velocity and analysis data for determining whether a stack shutdown alarm data is generated.

[0050] Each digital strong-motion seismometer 2 has a data storage module 27 for real-time storage of the corresponding acceleration sensing signal from the acquisition terminal 1, real-time storage of the converted digital acceleration signal, and analysis data for determining whether a single monitoring point alarm data has been generated. The analysis data for determining whether a single monitoring point alarm data has been generated may include the first comparison result, etc.

[0051] The data storage unit 37 of the terminal cabinet 3 is used to store alarm data from a single monitoring point in real time (which may include the corresponding digital acceleration signal from the acquisition terminal 1, the first comparison result, etc.), the response spectrum and / or cumulative absolute velocity calculated based on the alarm data from the single monitoring point, and analysis data for determining whether a stack stop alarm has been generated. The analysis data for determining whether a stack stop alarm has been generated may include the second comparison result, etc.

[0052] In this case, the display of the terminal cabinet 3 can also provide functions such as historical data query, historical curve plotting, and reports based on the various data stored in the data storage unit 37.

[0053] In some optional implementations, the terminal cabinet 3 is used for: if the alarm data of a single monitoring point comes from a free-field monitoring point; calculating the velocity response spectrum in the 1~2Hz band and the acceleration response spectrum in the 2~10Hz band for the X-axis, Y-axis, and Z-axis digital acceleration signals respectively; determining whether the velocity response spectrum in any direction exceeds the larger of the design velocity response spectrum or 15.24cm / s; determining whether the acceleration response spectrum in any direction exceeds the larger of the design acceleration response spectrum or 0.2g; if the velocity response spectrum in any direction exceeds the larger of the design velocity response spectrum or 15.24cm / s, and the acceleration response spectrum in any direction exceeds the larger of the design acceleration response spectrum or 0.2g, then the response spectrum exceeds the limit; calculating the cumulative absolute velocity of the X-axis, Y-axis, and Z-axis digital acceleration signals respectively; determining whether the cumulative absolute velocity in any direction exceeds 0.16g·sec; if the cumulative absolute velocity in any direction exceeds 0.16g·sec... If g˙sec, the cumulative absolute velocity exceeds the limit; if both the reaction spectrum and the cumulative absolute velocity exceed the limit, then a reactor shutdown alarm will be generated.

[0054] In some optional implementations, the terminal cabinet 3 is used to: if the alarm data of a single monitoring point comes from the plant's basic monitoring point; calculate the velocity response spectrum in the 1~2Hz band and the acceleration response spectrum in the 2~10Hz band for the X-axis acceleration digital signal, the Y-axis acceleration digital signal, and the Z-axis acceleration digital signal, respectively; determine whether the velocity response spectrum in any direction exceeds the larger value between the design velocity response spectrum and 15.24cm / s; determine whether the acceleration response spectrum in any direction exceeds the larger value between the design acceleration response spectrum and 0.2g; if the velocity response spectrum in any direction exceeds the larger value between the design velocity response spectrum and 15.24cm / s, and the acceleration response spectrum in any direction exceeds the larger value between the design acceleration response spectrum and 0.2g, then generate stack stop alarm data.

[0055] The following describes the analysis process for determining whether to generate a stack stop alarm data in terminal cabinet 3, especially data processing terminal 32. The analysis process for determining whether to generate stack stop alarm data is based on the difference between the data acquisition terminal 1 corresponding to a single monitoring point alarm data and the monitoring point in the free field or the monitoring point in the plant foundation.

[0056] For free field monitoring points: (1) Calculate the velocity response spectrum in the 1~2Hz band and the acceleration response spectrum in the 2~10Hz band for the X-axis acceleration digital signal, the Y-axis acceleration digital signal and the Z-axis acceleration digital signal respectively.

[0057] The 5% damping ratio response of the three-dimensional acceleration digital signals was calculated to obtain the velocity response spectrum in the 1~2Hz frequency band and the acceleration response spectrum in the 2~10Hz frequency band.

[0058] (2) Determine whether the velocity response spectrum in any direction exceeds the design velocity response spectrum (the design velocity response spectrum can be 1 / 3 of the low-level seismic velocity response spectrum or the safe shutdown seismic velocity response spectrum) or the larger value of the spectral velocity of 15.24 cm / s.

[0059] (3) Determine whether the acceleration response spectrum in any direction exceeds the larger value of the design acceleration response spectrum (the design acceleration response spectrum can be 1 / 3 of the low-level seismic acceleration response spectrum or the safe shutdown seismic acceleration response spectrum) or 0.2g.

[0060] (4) If the velocity response spectrum in any direction exceeds the larger of the design velocity response spectrum or 15.24 cm / s, and the acceleration response spectrum in any direction exceeds the larger of the design acceleration response spectrum or 0.2g, then the response spectrum is out of limit.

[0061] (5) Calculate the cumulative absolute velocity (CAV) of the X-axis acceleration digital signal, Y-axis acceleration digital signal and Z-axis acceleration digital signal respectively.

[0062] The method for calculating the cumulative absolute velocity of any direction acceleration digital signal is as follows: The absolute acceleration time history (in g) of any direction of motion is divided into 1-second intervals. At least one acceleration exceeding 0.025g within the 1-second interval is processed, and the processed values ​​in the entire record are accumulated to obtain the CAV (in g-second) of the time history record.

[0063] (6) Determine whether the cumulative absolute velocity in any direction exceeds 0.16 g·sec.

[0064] (7) If the cumulative absolute velocity in any direction exceeds 0.16 g˙sec, then the cumulative absolute velocity exceeds the limit.

[0065] (8) If the reaction spectrum exceeds the limit and the cumulative absolute velocity exceeds the limit, then generate the stack shutdown alarm data.

[0066] For basic monitoring points in the factory building: (1) Calculate the velocity response spectrum in the 1~2Hz band and the acceleration response spectrum in the 2~10Hz band for the X-axis acceleration digital signal, the Y-axis acceleration digital signal and the Z-axis acceleration digital signal respectively.

[0067] The 5% damping ratio response of the three-dimensional acceleration digital signals was calculated to obtain the velocity response spectrum in the 1~2Hz frequency band and the acceleration response spectrum in the 2~10Hz frequency band.

[0068] (2) Determine whether the velocity response spectrum in any direction exceeds the design velocity response spectrum (the design velocity response spectrum can be 1 / 3 of the low-level seismic velocity response spectrum or the safe shutdown seismic velocity response spectrum) or the larger value of the spectral velocity of 15.24 cm / s.

[0069] (3) Determine whether the acceleration response spectrum in any direction exceeds the larger value of the design acceleration response spectrum (the design acceleration response spectrum can be 1 / 3 of the low-level seismic acceleration response spectrum or the safe shutdown seismic acceleration response spectrum) or 0.2g.

[0070] (4) If the velocity response spectrum in any direction exceeds the larger of the design velocity response spectrum or 15.24 cm / s, and the acceleration response spectrum in any direction exceeds the larger of the design acceleration response spectrum or 0.2g, then a stack shutdown alarm data is generated.

[0071] Figure 3 A flowchart illustrating a research reactor seismic monitoring method according to an embodiment of this application is shown. The method of this embodiment is implemented by the aforementioned research reactor seismic monitoring system, and includes: Step S310: Collect acceleration sensor signals from the monitoring points; Step S320: Convert the acceleration sensing signal into an acceleration digital signal, and determine whether to generate single monitoring point alarm data based on the acceleration digital signal; Step S330: When generating single monitoring point alarm data, calculate the reaction spectrum and / or cumulative absolute velocity based on the single monitoring point alarm data, determine whether to generate stack stop alarm data based on the reaction spectrum and / or cumulative absolute velocity, and issue an alarm when stack stop alarm data is generated.

[0072] Reference Figure 1 and Figure 3As shown, one acquisition terminal 1 acquires the acceleration sensing signal of one monitoring point. The acceleration sensing signal acquired by one acquisition terminal 1 may include X-axis acceleration sensing signal, Y-axis acceleration sensing signal, and Z-axis acceleration sensing signal. One acquisition terminal 1 uses the acquired X-axis acceleration sensing signal as one subset of monitoring information, the acquired Y-axis acceleration sensing signal as one subset of monitoring information, and the acquired Z-axis acceleration sensing signal as one subset of monitoring information. The three subsets of monitoring information are combined into one monitoring information set.

[0073] One acquisition terminal 1 transmits the monitoring information set to a corresponding digital strong-motion seismograph 2. The digital strong-motion seismograph 2 performs analog-to-digital conversion preprocessing on each subset of the monitoring information set from the corresponding acquisition terminal 1 to obtain the monitoring point dataset for the corresponding acquisition terminal 1. The monitoring point dataset includes three subsets of monitoring point data, corresponding to the X-axis acceleration digital signal, Y-axis acceleration digital signal, and Z-axis acceleration digital signal, respectively.

[0074] A digital strong-motion seismometer 2 compares a subset of data from three monitoring points with an acceleration sensing threshold. If any subset of data from any monitoring point (i.e., the corresponding directional digital acceleration signal) exceeds the acceleration sensing threshold, a single monitoring point alarm is generated. This single monitoring point alarm data is then transmitted as an alarm dataset to the terminal cabinet 3.

[0075] Terminal cabinet 3 calculates the corresponding response spectrum and / or cumulative absolute velocity based on the three monitoring point data subsets included in the alarm dataset, and performs a second comparison between the response spectrum and the response spectrum threshold and / or the cumulative absolute velocity and the cumulative absolute velocity threshold. If the response spectrum exceeds the response spectrum threshold and / or the cumulative absolute velocity exceeds the cumulative absolute velocity threshold, a stack stop alarm data is generated. The stack stop alarm data is then transmitted to the main control room 4 for alarm transmission.

[0076] Figure 4 A flowchart illustrating a research reactor seismic monitoring method according to another embodiment of this application is shown. The method of this embodiment is implemented by the aforementioned research reactor seismic monitoring system, and includes: start.

[0077] Step S401: Monitor the bias voltage at the acquisition terminal of the monitoring point. Proceed to step S402.

[0078] Step S402: Determine whether the bias voltage exceeds the reference value range. If it does, proceed to step S403; if it does not, proceed to step S404.

[0079] Step S403: Mark the acquisition terminal as an exception and notify the acquisition terminal of the exception. End.

[0080] Step S404: Collect the X-axis acceleration sensing signals, Y-axis acceleration sensing signals, and Z-axis acceleration sensing signals from the monitoring points, and convert these signals into X-axis digital acceleration signals, Y-axis digital acceleration signals, and Z-axis digital acceleration signals, respectively. Proceed to step S405.

[0081] Step S405: Compare the X-axis acceleration digital signal, Y-axis acceleration digital signal, and Z-axis acceleration digital signal with the acceleration sensing threshold, respectively. Proceed to step S406.

[0082] Step S406: Determine whether the digital acceleration signal in any direction exceeds the acceleration sensing threshold. If it exceeds, proceed to step S407; if it does not exceed, end.

[0083] Step S407: Determine whether the bias voltage exceeds the historical bias voltage fluctuation range. If it does, proceed to step S408; if it does not, proceed to step S409.

[0084] Step S408: Mark the acquisition end a second time and notify the acquisition end of an anomaly. End.

[0085] Step S409: Determine whether the monitoring point is a free field monitoring point or a factory foundation monitoring point. If it is a free field monitoring point, proceed to steps S410 and S411; if it is a factory foundation monitoring point, proceed to step S418.

[0086] Step S410: Calculate the 5% damping ratio response of the X-axis, Y-axis, and Z-axis digital acceleration signals respectively to obtain the velocity response spectrum in the 1-2 Hz frequency band and the acceleration response spectrum in the 2-10 Hz frequency band. Proceed to steps S412 and S413.

[0087] Step S411: Calculate the cumulative absolute velocity of the X-axis, Y-axis, and Z-axis acceleration digital signals, respectively. Proceed to step S415.

[0088] Step S412: Determine whether the velocity response spectrum in any direction exceeds the larger value between the design velocity response spectrum and 15.24 cm / s. If yes, proceed to step S414; otherwise, end.

[0089] Step S413: Determine whether the acceleration response spectrum in any direction exceeds the larger value between the design acceleration response spectrum and 0.2g. If yes, proceed to step S414; otherwise, end.

[0090] Step S414: Reaction spectrum exceeds limits. Proceed to step S417.

[0091] Step S415: Determine whether the cumulative absolute velocity in any direction exceeds 0.16 g·sec. If yes, proceed to step S416; otherwise, end.

[0092] Step S416: Accumulated absolute speed exceeds limit. Proceed to step S417.

[0093] Step S417: Generate stack stop alarm data and trigger the alarm. End.

[0094] Step S418: Calculate the 5% damping ratio response of the X-axis, Y-axis, and Z-axis digital acceleration signals respectively to obtain the velocity response spectrum in the 1-2 Hz frequency band and the acceleration response spectrum in the 2-10 Hz frequency band. Proceed to steps S419 and S420.

[0095] Step S419: Determine whether the velocity response spectrum in any direction exceeds the larger value between the design velocity response spectrum and 15.24 cm / s. If yes, proceed to step S421; otherwise, end.

[0096] Step S420: Determine whether the acceleration response spectrum in any direction exceeds the larger value between the design acceleration response spectrum and 0.2g. If yes, proceed to step S421; otherwise, end.

[0097] Step S421, reaction spectrum exceeds limits. Proceed to step S422.

[0098] Step S422: Generate stack stop alarm data and trigger the alarm. End.

[0099] It should be noted that the aforementioned research reactor seismic monitoring methods can be implemented by the aforementioned research reactor seismic monitoring system, which will not be elaborated further.

[0100] The above-described embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included within the protection scope of the present invention.

Claims

1. A research reactor seismic monitoring system, characterized in that, The system includes: multiple acquisition terminals, multiple digital strong-motion seismometers that are communicatively connected to each acquisition terminal, and a terminal cabinet that is communicatively connected to each digital strong-motion seismometer. Each acquisition terminal is used to acquire the acceleration sensing signal of each monitoring point and transmit the acceleration sensing signal to the corresponding digital strong motion meter. Each digital strong-motion meter is used to convert the acceleration sensing signal into an acceleration digital signal, determine whether to generate single monitoring point alarm data based on the acceleration digital signal, and transmit the single monitoring point alarm data to the terminal cabinet when generating single monitoring point alarm data. The terminal cabinet is used to calculate the response spectrum and / or cumulative absolute velocity based on alarm data from a single monitoring point, determine whether to generate stack stop alarm data based on the response spectrum and / or cumulative absolute velocity, and issue an alarm when stack stop alarm data is generated.

2. The research reactor seismic monitoring system according to claim 1, characterized in that, Each acquisition end is a triaxial accelerometer; Each triaxial accelerometer is used to collect X-axis, Y-axis, and Z-axis acceleration sensing signals at each monitoring point, and transmits the X-axis, Y-axis, and Z-axis acceleration sensing signals to the corresponding digital strong-motion seismometer.

3. The research reactor seismic monitoring system according to claim 1, characterized in that, Each digital strong-motion seismometer includes: a data acquisition module, a processor, a judgment module, a remote communication module, and a primary power supply; The data acquisition module is used to acquire the acceleration sensing signal from the corresponding acquisition end and transmit the acceleration sensing signal to the processor. The processor is used to convert the acceleration sensing signal into a digital acceleration signal and transmit the digital acceleration signal to the judgment module; The judgment module is used to perform a first comparison between the digital acceleration signal and the acceleration sensing threshold, and determine whether to generate single monitoring point alarm data based on the first comparison result. The remote communication module is used to transmit the alarm data of a single monitoring point to the terminal cabinet when generating alarm data for a single monitoring point. The first power supply is used to power the data acquisition module, processor, judgment module, remote communication module and corresponding acquisition terminal.

4. The research reactor seismic monitoring system according to claim 1, characterized in that, The terminal cabinet includes: a network switch, a data processing terminal, a data communication interface, a display unit, and a second power supply; A network switch is used to acquire alarm data from a single monitoring point and transmit the alarm data from the single monitoring point to a data processing terminal. The data processing terminal is used to calculate the reaction spectrum and / or cumulative absolute velocity based on alarm data from a single monitoring point, perform a second comparison between the reaction spectrum and the reaction spectrum threshold and / or the cumulative absolute velocity and the cumulative absolute velocity threshold, and determine whether to generate stack shutdown alarm data based on the second comparison result. The data communication interface is used to send an alarm to the main control room when generating stack stop alarm data; The display unit is used to display stack stop alarm data; The second power supply is used to power the network switch, data processing terminal, data communication interface and display unit.

5. The research reactor seismic monitoring system according to claim 1, characterized in that, Each digital strong-motion seismometer also includes: a channel verification module and a remote communication module; The channel inspection module is used to monitor the bias voltage of the corresponding acquisition terminal, compare the bias voltage with the reference value range, and check the first working state of the corresponding acquisition terminal based on the third comparison result. When the first working state is abnormal, the corresponding acquisition terminal is marked. The remote communication module is used to transmit the first tag from the acquisition end to the terminal cabinet.

6. The research reactor seismic monitoring system according to claim 5, characterized in that, The terminal cabinet also includes: a channel inspection unit and a data communication interface; The channel inspection unit is used to monitor the bias voltage of the acquisition terminal corresponding to the alarm data of a single monitoring point. It performs a fourth comparison with the historical bias voltage fluctuation range of the corresponding acquisition terminal, and checks the second working state of the corresponding acquisition terminal based on the fourth comparison result. When the second working state is abnormal, the alarm data of the single monitoring point is removed and the corresponding acquisition terminal is marked in the second way. The data communication interface is used to transmit the first tag and / or the second tag of the acquisition end to the main control room.

7. The research reactor seismic monitoring system according to claim 1, characterized in that, Each digital strong-motion seismometer also includes: a data storage module; The data storage module is used to store in real time the acceleration sensor signals, acceleration digital signals, and analysis data for determining whether to generate single monitoring point alarm data from the corresponding acquisition end. And / or, the terminal cabinet also includes: a data storage unit; The data storage unit is used to store alarm data from a single monitoring point, response spectrum and / or cumulative absolute velocity, and analytical data for determining whether a reactor shutdown alarm has been generated in real time.

8. The research reactor seismic monitoring system according to claim 2, characterized in that, Terminal cabinets are used for: If the alarm data for a single monitoring point comes from a free-field monitoring point; Calculate the velocity response spectrum in the 1-2 Hz band and the acceleration response spectrum in the 2-10 Hz band for the X-axis, Y-axis, and Z-axis digital acceleration signals, respectively; determine whether the velocity response spectrum in any direction exceeds the larger value between the design velocity response spectrum and 15.24 cm / s; determine whether the acceleration response spectrum in any direction exceeds the larger value between the design acceleration response spectrum and 0.2g. If the velocity response spectrum in any direction exceeds the larger of the design velocity response spectrum or 15.24 cm / s, and the acceleration response spectrum in any direction exceeds the larger of the design acceleration response spectrum or 0.2 g, then the response spectrum exceeds the limit. Calculate the cumulative absolute velocity of the digital acceleration signals in the X, Y, and Z directions respectively; determine whether the cumulative absolute velocity in any direction exceeds 0.16 g·sec. If the cumulative absolute velocity in any direction exceeds 0.16 g·sec, the cumulative absolute velocity exceeds the limit. If the reaction spectrum exceeds the limit and the cumulative absolute velocity exceeds the limit, a stack shutdown alarm will be generated.

9. The research reactor seismic monitoring system according to claim 2, characterized in that, Terminal cabinets are used for: If the alarm data for a single monitoring point comes from the basic monitoring points in the factory building; Calculate the velocity response spectrum in the 1-2 Hz band and the acceleration response spectrum in the 2-10 Hz band for the X-axis, Y-axis, and Z-axis digital acceleration signals, respectively; determine whether the velocity response spectrum in any direction exceeds the larger value between the design velocity response spectrum and 15.24 cm / s; determine whether the acceleration response spectrum in any direction exceeds the larger value between the design acceleration response spectrum and 0.2g. If any velocity response spectrum exceeds the greater of the design velocity response spectrum or 15.24 cm / s, and any acceleration response spectrum exceeds the greater of the design acceleration response spectrum or 0.2g, then a stack shutdown alarm will be generated.

10. A method for monitoring reactor seismic activity, characterized in that, The method is implemented by the research reactor seismic monitoring system according to any one of claims 1 to 9, and the method includes: Acceleration sensor signals are collected from monitoring points; The acceleration sensor signal is converted into a digital acceleration signal, and the digital acceleration signal is used to determine whether to generate alarm data for a single monitoring point. When generating alarm data for a single monitoring point, the response spectrum and / or cumulative absolute velocity are calculated based on the alarm data for the single monitoring point. The system then determines whether to generate a stack shutdown alarm based on the response spectrum and / or cumulative absolute velocity. An alarm is triggered when stack shutdown alarm data is generated.

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