KR100496126B1 - coil current monitoring system for control element drive mechanism control system and methods thereof - Google Patents

Abstract

The present invention relates to a control rod drive system control system coil current monitoring system and method.

In particular, a signal controller connected to a power control box for controlling voltage to a control rod coil for amplifying, filtering, and isolating a received signal, and analog-to-digital conversion, temporary storage, signal processing, and transmission of acquired data acquired by the signal controller. A signal acquisition controller unit, a network hub connected to the signal acquisition controller unit to selectively expand the acquisition signal, and a surveillance analysis controller unit for analyzing data transmitted from the signal acquisition controller unit through the network hub.

Accordingly, the present invention provides a control rod drive system control system coil current monitoring system capable of confirming system integrity for failure diagnosis and maintenance of the control rod drive system and related control rod drive system and improving reliability of the system.

In addition, the present invention provides a control rod drive system control system coil current monitoring method.

Description

Coil current monitoring system for control element drive mechanism control system and methods

The present invention relates to a control rod coil control system coil current monitoring system, and more particularly, a signal controller for amplifying, filtering, and isolating a received signal connected to a power controller for controlling voltage to a control rod coil. A signal acquisition controller for analog-to-digital conversion, temporary storage, signal processing, and transmission of a signal obtained from the network, a network hub connected to the signal acquisition controller to selectively expand the acquisition signal, and a signal acquisition controller through the network hub. It consists of monitoring analysis controller that analyzes the data transmitted from the unit, and it is possible to troubleshoot and maintain the control element drive mechanism (CEDM) and related control element drive mechanism control system (CEDMCS). To check the system health and improve the system reliability. Provides a control rod drive control system coil current monitoring system.

In addition, the present invention provides a control rod drive system control system coil current monitoring method.

In general, a nuclear reactor is a device made so that nuclear energy can be utilized in real life by controlling a large amount of energy released momentarily during nuclear fission to be released slowly as desired.

In nuclear reactors, the combustion of nuclear fuel is controlled by controlling the number of neutrons absorbed by the nuclear fuel. A control rod made of boron is used to control the combustion speed of the fuel rod. The control rods are arranged between the fuel rods in the form of aggregates, and are vertically driven up and down by the control rod driving device to absorb neutrons generated during nuclear fission to suppress combustion of the fuel rods.

As such, the control rod increases or decreases the combustion rod's combustion speed depending on its position, and in some cases, shuts down the reactor. Therefore, precisely detecting and detecting the current position of the control rod is extremely necessary for proper control of the reactor output and prevention of accidents. It is important.

Currently, power plants use high-speed recorders to acquire coil signals to verify the health of the control rod drive system (CEDM) and control rod drive system (CEDMCS). This is a general-purpose recorder. The acquisition operation is performed manually on a limited input signal, and the acquisition result is printed on a recording sheet in real time or stored in a file. Therefore, the method was inconvenient to use, took a long time to acquire, lost a lot of recording paper, and did not include an analysis function and an alarm function for fault diagnosis.

In addition, in order to acquire the current of the control rod drive coil using a high speed recorder, the preparation process is complicated, requires a lot of time and manpower, and the number of channels that can be acquired is fixed. As there is no alarm and log function at all, the analysis of the acquisition results mainly depends on the printing contents of the recording paper, and it is difficult to efficiently analyze and maintain the faults of the control rod drive system and the control rod drive system.

An object of the present invention for improving the above problems, the time and manpower required for the maintenance of the control rod drive device and control system by automatically acquiring and analyzing the coil current waveform of the control rod drive device to display, alarm, and record the result The present invention provides a control rod drive system control system coil current monitoring system and method that can improve the reliability of the system by reducing the cost and more precise and systematic diagnosis.

In addition, the control rod drive control system coil current monitoring system and method for systematically accumulating the history of the control rod drive system (CEDM) and the control rod drive system control system (CEDMCS) to be utilized for future preventive maintenance tasks. To provide.

In order to achieve the above object, the present invention, in the control rod drive system control system coil current monitoring system for analyzing the current signal flowing through the coil of the control rod drive device of the nuclear power plant, the result, the connector of the power control box A signal controller for amplifying, filtering and isolating a coil current signal received by being connected to a cable; A signal acquisition controller unit for performing analog-to-digital conversion, temporary storage, signal processing, and transmission of the acquired data acquired by the signal controller; A network hub connected to the signal acquisition controller unit and having a plurality of ports for selectively extending an acquisition signal; Monitoring, alarming or recording according to an appropriate range for the result obtained by receiving, storing and diagnosing data transmitted from the signal acquisition controller through the network hub, and determining and transmitting the control signal and the set value to the signal acquisition controller. It consists of a configuration including a controller unit.

The signal acquisition controller unit may further include a data acquisition card that converts the analog signal received by the signal controller into a digital signal and temporarily stores it in a memory.

The monitoring and analysis controller unit may further include an output device for outputting measurement results and data to one side, an uninterruptible power supply, and a display unit for displaying the analyzed data and a graph.

A control rod drive system control system coil current monitoring method, comprising: a first step of inputting a control command to set an operation mode; In the case of setting the continuous acquisition mode according to the setting of the first step, the buffer is checked and the acquired data is fetched, the file is created or added to an existing file, and when the monitoring mode is set, the buffer check and the acquired data are retrieved. A second step of inspecting a control rod operation driving flag; A third step of checking a file size, adding drawing data, and comparing the control rod operation sequence with a pattern when the control rod operation flag is in operation according to the second step; A fourth step of generating an alarm if the control rod operation sequence and pattern are abnormal according to the third step and determining the control rod driving state if the control rod operation sequence is abnormal; And a fifth step of setting a stop start timer when the control rod is stopped after the fourth step, and setting a control rod stop flag when the stop duration is greater than the set value.

In addition, in the third step, when the control rod operation flag is stopped according to the second step, the coil currents of the upper tong UG and the lower tong LG are stored in a file at regular intervals (low speed acquisition). Routine), continually, the coil currents of the upper and lower tongs are judged and an alarm is generated in case of abnormality.In case of normal operation, the state of the control rod is judged again. Generating a file and setting a control rod operation flag.

In addition, the step of switching to the monitoring mode of the second step, if the range of the input signal is out of the proper range regardless of whether the control rod is driven out of range alarm is generated to notify the user and at the same time detect the out of range signal recorded in the log and The alarm logic step is further characterized.

The determining of the coil currents of the upper and lower tongs of the third step may include setting an upper / lower limit of an upper tong (UG) or lower tongs (LG) current signal holding the control rod in a non-driven state of the control rod. If the area is exceeded, the UG / LG coil current abnormal signal detection and alarm logic step of generating high and low level alarms for the coil of the control rod driving device (CEDM) and recording the result in a log file are further included. do.

In the determining of the control rod driving state of the third and fourth stages, the control rod for detecting whether the driving of the control rod is detected by detecting the change state of the acquired coil current signal and differentiating the current signal for each coil to track the slope of the waveform. It is characterized in that it further comprises a drive determination step.

In addition, the step of comparing the control rod operation sequence and the pattern of the third step, the analysis of the drive sequence and the waveform correspondence analysis so as to remove and planarize the components above the specific frequency included in the acquisition waveform to compare with the reference waveform of the system. In the case of a signal acquired at 2000 points per second before performing, the filter logic step of removing a frequency component of 60 Hz or more by taking a 33-point moving average and removing a frequency component of 180 Hz or more by taking an 11-point moving average is further included. It is done.

In addition, in the filtration logic step, after dividing the filtered waveform by a signal level set value with respect to a waveform of one cycle, a binary code is assigned to each coil signal, and then combined in coil order, and then encoded in hexadecimal. Comparing with the code, the driving sequence encoding and discrimination logic step for determining the stationary state, normal draw-out and insertion state, and various abnormal driving states of the control rod is further included.

The driving sequence encoding and discriminating logic step may include a reference waveform generated by extracting and storing one periodic waveform after filtering using a moving average only when it is determined to be a normal drawing and insertion sequence through the driving sequence discriminating logic step. Selecting and calculating the error of the selected reference waveform and the currently acquired waveform, characterized in that it further comprises a logic step of generating the reference waveform and the calculation of waveform matching degree.

In addition, the operation mode is characterized by selectively performing the state, environment, data analysis, standby, setting, monitoring, continuous, analysis mode for the automatic / manual conversion of the system.

In addition, the standby mode is characterized in that the initial state is set to check the basic state of the system.

The setting mode may be configured to set a predetermined system-wide environment through data input by an administrator, and to change and store the environment according to the set data value so that the system can be driven.

In addition, the monitoring mode is a high-speed acquisition routine by automatically analyzing the data obtained in real time in the state of the environment of the system by the setting mode, and determines whether the driving of each control rod drive device (CEDM) and whether there is an abnormality of the current signal And low-speed acquisition routines.

In addition, the continuous mode, characterized in that for continuously displaying and storing the waveform of the control rod drive device (CEDM) specified on the basis of the data input in real time so that the user can check.

In addition, the analysis mode has a predetermined function (waveform reproduction, waveform reduction / enlargement, reference cursor, movement cursor display, cursor deviation, point moving average value, waveform on / off, superimposition function so that the stored data file can be analyzed). , Partial extraction, etc.) and built-in tools, so that the administrator can analyze the analyzed data.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The present invention is a signal source for the current signal flowing to each of the four coils constituting each CEDM of the nuclear power plant, namely UL (Upper Lift Coil), UG (Upper Gripper Coil), LL (Lower Lift Coil), LG (Lower Gripper) Used as

In particular, the control rod driving device (CEDM) is a device for inserting and withdrawing the control rod into the reactor to control the output of the nuclear power plant, the number of control elements (CEA) is installed on the top of the reactor, the driving force is supplied to the coil Is the electromagnetic force generated by Therefore, in the CEDM coil, the power signal supplied for driving and the signal induced according to the driving progress are mixed, so analyzing the electrical signal flowing through the coil can determine the driving status of the control rod, that is, whether driving is appropriate, whether the driving is appropriate, and whether there is an abnormality. .

Acquisition signal source connection part is the connector installed in the power switch assembly (500) of the control rod driving device (CEDM) cabinet, one connector is connected to the signal of four coils mounted on one CEDM Supply a voltage signal in the range of about 0-50 [mV].

As shown in Figure 1, the present invention, the signal controller 100 is connected to the connector and the cable of the power control box 500, and analog-to-digital conversion of the signal obtained by the signal controller 100, temporary storage And a signal acquisition controller unit 200 for signal processing and transmission, a network hub 300 connected to the signal acquisition controller unit 200 to selectively extend an acquisition signal, and the signal acquisition controller unit 200. Surveillance analysis controller 400 for analyzing the transmitted data and transmitting the control signal and the set value to the signal acquisition controller unit 200.

The current signal of the CEDM coil applied to the present invention is changed into a voltage form through a shunt resistor and applied to a connector installed at the front of the power switch assembly.

The signal controller 100 connected to the power control box 500 performs amplification, filtration, and isolation of the received signal, and the signal acquisition controller 200 performs analog-digital conversion, temporary storage, and signal processing of the signal. And performing the transmission, and the monitoring analysis controller 400 is configured to store, diagnose, analyze, alert, record, display or print the data transmitted from the signal acquisition controller 200 through the network.

In addition, the signal controller 100 is connected to the connector and the cable of the power control box 500 to provide electrical isolation with the power control box 500, the input signal required for analog-to-digital conversion Amplify by 100 times and filter to block unnecessary high frequency noise (Low Pass Filter, Cutoff Frequency = 500Hz).

The signal acquisition controller 200 connected to the signal controller 100 has a data acquisition card mounted to one side, and the data acquisition card receives an analog signal in the range of 0-5 [V] received from the signal controller 100. It converts into digital signal (adjustable around Sampling Frequency = 2000 Sample / sec) and temporarily stores it in the controller memory.

At this time, the stored signal is selected according to the computer program of the signal acquisition controller 200, stored in the hard disk and transmitted to the monitoring analysis controller 400. In addition, the signal acquisition controller unit 200 receives a control signal and a related set value from the monitoring analysis controller unit 400.

The network hub 300 connected to the signal acquisition controller 200 has an extra port to connect several signal acquisition controllers 200 to expand the acquisition signal as needed. In addition, remote operation of surveillance analysis controller enables data acquisition and monitoring.

Here, the signal acquisition controller 200 and the monitoring and analysis controller 400 are connected through the network hub 300, and if necessary, only the signal acquisition controller 200 and the signal controller 100 are expanded to acquire the channel of the acquisition signal. You can expand the number.

The signal acquisition controller 200 may further include a data acquisition card for converting an analog signal received by the signal controller 100 into a digital signal and temporarily storing the signal in a memory.

The monitoring analysis controller 400 connected to the signal acquisition controller 200 through the network hub 300 automatically receives, monitors, and analyzes data transmitted from the signal acquisition controller 200 via a network. The result is displayed, alerted, and recorded, and the control signal and the set value are transmitted to the signal acquisition controller 200. In addition, by installing a relay module in the monitoring analysis controller unit 400 may be connected to the alarm system of the power plant main control room.

In addition, the monitoring analysis controller 400, the output device 410 for outputting the measurement results and data to one side, the uninterruptible power supply 420 and the display unit 430 for displaying the analyzed data and graphs are further connected. do.

As shown in FIG. 10, the display unit 430 includes an MMI (Man Machine Interface) screen. The main screen of the system is a monitoring mode screen. The currently connected CEDM number, an operation mode of the system, and an alarm state are displayed. There is also a button to switch to another mode or subscreen. The lower screen of the monitoring mode includes a log screen, a help screen, and an individual CEDM coil current status detail screen.

The setting mode screen is composed of three screens: system setting, alarm setting, and setting value input. In the system setting screen, input the application power station, data acquisition cycle, storage path, IP address of the signal acquisition controller unit 200 and connected CEDM and display the connected CEDM.In the alarm setting screen, select the operation / non-operation by alarm type. In the set value input screen, input or change each numerical set value.

The continuous mode screen is composed of a continuous mode target selection screen and a waveform display screen of the selected CEDM. On the waveform display screen, the waveform currently being acquired of the selected CEDM is displayed in real time.

Waveform analysis screen displays file, display and change waveform color, reduce / enlarge / move waveform, display deviation between cursor and cursor, compare with reference waveform, display selection by coil (show / hide), display waveform by coil Includes off-set, section extraction, reference waveform generation, moving average (filtration) and printing.

All acquired signals can be saved to a file for manual analysis or documentation when needed. The file name includes the CEDM number and the date and time of acquisition, and the file extension is divided into high speed and low speed acquisition files, making it easy to identify the files during manual analysis.

In addition, the Help function and screen provides a help screen for the user to understand the system, learn how to use it, and review the analysis contents. The help file is created as a separate file, which can be called from inside and outside the monitoring / analysis application for viewing and printing. If possible, the contents of the Help file include the overall documentation, including the organization of the system, description, procedures for use, analysis and troubleshooting. Help file is written in Hyper Text format and can be moved directly to the page by table of contents, subtitle and key keywords. In addition, when a user clicks a help button on a MMI screen in a specific mode, the user directly displays contents directly related to the corresponding mode screen, and provides a means for moving, printing, and terminating a page in the help screen.

 Alarm and Log alarms are expressed by indicators on MMI screens, symbols, path messages in Log files, and relay contact drive. The use of alarm type can be selected in the setting mode.

Alarms to be handled in this system are divided into alarms for the system itself and alarms for coil current signals. System alarm is an alarm that is generated by the self-diagnosis program to notify the user of problems of the system itself such as abnormal data acquisition card and network status, insufficient storage space, data overflow, etc. (Indicator) lights up and the details are recorded in the log file.

The CEDM current signal-related alarm is an alarm that is generated when the coil signal is abnormal by the logic of the application program of the monitoring analysis controller 400. The coil current sequence abnormality and CEDM when the CEDM is driven. Occurs when the coil current waveform is abnormal during driving.

In the system log screen, log files are added and stored in the order of important events and alarms of the system for the history management and problem analysis of the system.In case of alarms, the system records only once so that the same alarm in the system does not overflow. The alarm status is indicated until it is initialized by the user or until automatically released. In addition, the log file must maintain the contents of the previous log more than a certain time on the basis of the current, and is automatically stored as a separate permanent file when the current log file size becomes more than a certain size. The log file allows the user to view the log file on the screen as needed, to rearrange and scroll the log contents by time and alarm, to reset the alarm status on the screen, and to save and print the current log file separately. Is possible.

In addition, a printer that is an output device 410, an installation rack, an uninterruptible power supply, various cables, and the like are used.

Referring to the operation of a series of operations of the present invention made of such a configuration as follows.

 2 shows the flow of a program for performing automatic acquisition and analysis of coil current signals.

In the control rod driving device control system coil current monitoring method, a control command is input (601) to set the operation mode (602), and when the continuous acquisition mode is set according to the setting of the operation mode, the buffer is checked and the acquired data. After fetching (603) the file is created or added to the existing file (604), if the monitoring mode is set, the buffer check and acquisition data is fetched (605) to check the control rod operation drive flag (606). .

In this case, if the control rod operation flag is in operation, the file size is checked and the drawing data is added (607). Then, the control rod operation sequence and pattern are compared and determined (608). In case of normal operation, the control rod driving state is determined (609).

When the driving state of the control rod is stopped, a stop start timer is set (610), and the stop duration is determined (611). If the control rod is larger than the set value, a control rod stop flag (612) is set.

On the other hand, if the control rod operation flag (flag) is inspected in the stopped state (606), the coil currents of the upper tong (UG) and lower tongs (LG) are stored in a file at regular intervals (low speed acquisition routine) (613) ), And determine the coil current of the upper and lower tongs (614), an alarm is generated when the abnormality is abnormal, and if it is normal to determine the state of the control rod again (615), if the non-driven, the extracted data is temporarily stored (616) If it is driven, a file is generated (617) and the control rod operation flag is set (618).

In addition, the signal acquired by the signal acquisition controller unit 200 includes detection and alarm logic steps of an out-of-range signal that checks for problems of the system itself through a general / irrational test. Irrespective of whether the control rod is driven or not, if the range of the input signal is out of the proper range, an out-of-range alarm is issued to inform the user and recorded in the log at the same time. This is to detect when the input signal range is out of the normal range due to a problem such as setting of the coil current monitoring system or a hardware failure.

That is, the signal acquired by the signal acquisition controller unit 200 is used to check the adequacy of the signal range and determine whether the control rod is driven. Abnormal alarm is generated when it is out of the proper range of input signal regardless of whether the control rod is driven. Also, if the coil current signal exceeds the upper / lower limit setting range in the non-driven state of the control rod, the CEDM coil has a high level. High and low alarms are generated and the results are logged.

In addition, when the specific coil (UG or LG) current signal holding the control rod exceeds the upper / lower limit range in the control rod non-drive situation, a high level and low level alarm is generated for the coil of the CEDM. The logic to record the result in a log file, which includes the detection and alarm logic step of the UG / LG coil current abnormal signal to detect the health of the control rod holding state.

In addition, as shown in FIG. 3, whether the control rod is driven is determined by sensing a change state of the obtained coil current signal. That is, when the control rod is not driven, a constant voltage [45 Volt] is supplied only to the upper gripper (UG) coil and the remaining coil voltage is 0 [Volt]. The voltage levels of are changed sequentially. Therefore, the control rod driving logic step of determining whether to drive by differentiating the current signal for each coil by tracking the slope of the waveform is included.

In the case of the control rod pull-out operation, the UL coil is energized first, and in the case of insertion, the LG coil is first energized, and thus the driving start can be detected using the current change of these two coils. In addition, since the driving flag is set for a predetermined time after the determination as the driving once, the waveform is automatically saved by preventing the unnecessary hunting.

The result of discrimination of driving acts as a switch for automatically acquiring waveforms. When the control rod is running or abnormal, it automatically enters the high speed acquisition mode and all waveform data is stored in the storage device at high speed (2000 Sample / sec). 4 Sample / min) to reduce unnecessary load on the system.

In addition, as shown in FIG. 4, the acquired data requires filtration logic before performing drive sequence and waveform consistency analysis. The purpose of the filtration logic is to remove and planarize the components above the specified frequency contained in the acquired waveform to facilitate comparison with the reference waveform of the system. Since the power supplied to the CEDM to drive the control rod is a 60 [Hz] three-phase power source, there are 60 [Hz] and 180 [Hz] components in the acquired waveform. Therefore, in case of a signal acquired at 2,000 point per second (Sampling Rate = 2000 Sample / sec), it takes a 33 point moving average to remove frequency components above 60 Hz, and takes 11 point moving average to remove frequency components above 180 Hz. A filter logic step is included.

In addition, as shown in FIG. 5 or FIG. 6, since the CEDM coil current signal represents a unique sequence according to the driving pattern, encoding and analyzing the driving sequence includes a driving sequence encoding and discriminating logic step for distinguishing the driving pattern. . The encoding method first filters the waveform and then divides the signal level set value for one period of waveform based on the reference level, then gives binary codes to each coil signal, combines them in coil order again, and generates a unique code by hexadecimal encoding. It is.

Therefore, when the sequence of the acquired waveform is encoded and compared with the reference code, the control rod stop state, the normal drawing and insertion state, and various abnormal driving states can be determined.

In addition, as shown in FIG. 7 or FIG. 8, only when it is determined that the normal drawing and inserting sequence is determined through the driving sequence discrimination logic, the soundness of the control rod system can be determined by comparing the acquired waveform with the reference waveform and calculating the difference. Reference waveform generation and waveform coincidence calculation logic steps are included. To do this, it is necessary to first select a reference waveform and write it to a file. The reference waveform is created by first filtering using a moving average and then extracting and storing one period waveform. This series of procedures is possible both automatically and manually.

  Waveform consistency check calculates the error between the previously prepared reference waveform and the currently acquired waveform. Here, the processing method of the acquisition waveform for comparison is the same as the reference waveform creation logic, and the error between the reference waveform and the acquisition waveform is calculated as the sum of squares of the difference in signal size for each point. The reason for using the sum of squares method is to prevent errors from being canceled and to emphasize a relatively large error rather than a small error.

If the drive sequence error or waveform match exceeds the test result setting, an alarm is triggered and the result is recorded in the log file.

On the other hand, as shown in Figure 9, the operation mode of the present invention is divided into standby, setting, monitoring, continuous, analysis. In the standby mode, the system is ready to check the basic state of the system without acquiring data. The setting mode sets and changes the general environment of the system. The monitoring mode performs full-scale data acquisition and automatic analysis. Waveforms are displayed continuously, and analysis mode is a mode for manual analysis.

The standby mode is a temporary operation state, the system automatically operates in the standby mode when the power is turned on when the system is started, generates an alarm when an abnormality occurs after checking the status of the network, data acquisition card, etc., and does not perform data acquisition operation. Maintain the command waiting state from the unit 400 When a command from the monitoring analysis controller unit is received, the mode is switched to the monitoring mode.

The setting mode is an environment setting mode of the monitoring analysis controller unit, which is started at the beginning and if necessary, inputs a system-applied unit, sets the signal acquisition controller unit IP address and the CEDM connected to the signal controller, the quantity of the signal acquisition controller unit and The network server IP is set, the sampling rate of the data acquisition card, the acquisition data storage path, and the like are set, and the basic setting values in the signal acquisition controller unit application program are specified or changed. In addition, the alarm is set, the reference waveform or the singular waveform sequence database is registered, the setting state is saved after the setting operation, and the setting mode is exited to enter the monitoring mode.

The monitoring mode is automatically performed continuously for all connected CEDMs as the basic mode of the system, and all connected input signals are continuously acquired at a sampling cycle of 2000 Sample / sec, stored in a temporary buffer of the signal acquisition controller unit, and driven by CEDM. It determines whether the current signal is abnormal and whether there is an abnormality of the current signal, and distinguishes it into a high speed acquisition routine and a low speed acquisition routine according to the results. This is done by comparing with.

Here, the low speed acquisition routine is a routine that is performed when a specific CEDM is in a non-driven state and is normal. In this case, the UL, UG, LL, and LG coil current signals stored in the temporary buffer are resampled at a low speed period for monitoring and analysis. The high speed acquisition routine is a routine which is executed when a specific CEDM is in a driving state or when a current signal is abnormal. In this case, the high speed acquisition routine is stored in a temporary buffer to transfer the current signals of all four coils of the CEDM. It is sent to the monitoring analysis controller at the interval of.

The continuous mode is a mode performed at the request of the user. The continuous mode is performed at the time of periodic inspection and test, the CEDM required by the monitoring and analysis controller unit is performed, the data is acquired at high speed according to the user's request, and the continuous mode is stopped and started. Is performed through the monitoring analysis controller.

In addition, the monitoring mode is interlocked with the monitoring mode of the signal acquisition controller unit to record the acquired data in the storage device, the storage path and file name of the data to be stored are designated in the setting mode, and 73 CEDMs are grouped on the screen. Sort by Group and Subgroup to provide the status of CEDM corresponding to each number, ie DAQ connection and normal / abnormal status. Also, if you click on a problem CEDM number, detailed information of abnormal status, ie time of occurrence It provides the corresponding CEDM number, symptom, action, and file name.The data acquired by the high-speed acquisition routine is automatically analyzed after the waveform is saved.If abnormal condition is detected as a result of the waveform analysis, the color of the corresponding CEA number in the CEA table is changed. It indicates the abnormality and generates an alarm at the same time.

The continuous mode, in conjunction with the continuous mode of the signal acquisition controller unit for the CEDM specified by the monitoring and analysis controller unit, continuously displays the data obtained on the screen as a waveform on the screen and saves it as a file upon user's request, and performs the continuous mode. Up to eight control rod assemblies can be selected, and the CEDM to be displayed as a waveform can be selected up to one subgroup (four CEDM). A new zoomable screen opens, showing the waveform of the current acquisition, and can be closed again when not needed.

To save simultaneously with the waveform observation, use the “Data Acquisition” button.The sampling period for display on the screen can be set in advance, but can be changed on the screen.The coil waveform displayed on the screen can be in the order of UL, UG, LL, LG from above. On the screen, four coils are displayed using a predetermined color and can be changed if necessary.The waveform on the screen progresses from right to left according to the operation of the control rod. If it occurs an alarm is triggered.

As shown in FIG. 11, the analysis mode is a manual mode, in which a previously stored file is analyzed in detail. A waveform reproduction function, a scroll function, a vertical / horizontal function, and a moving cursor display function can analyze a stored data file. It also has built-in deviation display function between cursors, average moving point value display function, waveform superimposition function, partial extraction function and tool, and enables administrators to analyze acquired data online or offline. In the analysis mode, the function is maintained unless the monitoring mode, which is the basic mode of the system, is forcibly terminated.

Thus, in the present invention, the control rod driving device coil is a mixture of the power signal supplied for driving and the signal induced according to the driving progress is mixed, the analysis of the electrical signal flowing through the coil driving conditions, that is, whether driving, There is a merit that can grasp adequacy and abnormality.

In addition, the present invention, the automation of the signal acquisition is implemented, the expandability of the signal through the network-based configuration to ensure the control rod drive system (CEDM) of the entire power plant if necessary, and automatically detects the abnormality of the acquisition signal It detects and generates alarm in case of abnormality and informs the predicted failure part, and it can register additionally by pattern of abnormal waveform in database, and it is easy to manage history by recording major alarms and events as well as current signal in a file. There is this. In addition, there is an advantage that a more detailed signal analysis can be provided by providing a manual analysis tool.

While the invention has been shown and described with respect to particular embodiments, it will be appreciated that the invention can be variously modified and varied without departing from the spirit or scope of the invention as provided by the following claims. It will be clear to those skilled in the art that it is very easy to know.

As described above, according to the present invention, by automatically acquiring and analyzing the coil current waveform, displaying, alarming, and recording the result, it is possible to reduce the time and manpower required for the maintenance of the control rod drive system and the control system, By systematically diagnosing the system, it is possible to check the system integrity for fault diagnosis and maintenance of the control rod drive system (CEDM) and related control rod drive system, and to improve the reliability of the system.

In addition, the history of the control rod drive system (CEDM) and the control rod drive system control system (CEDMCS) systematically accumulate and utilize in future preventive maintenance work is effective to improve the utilization rate of the system.

1 is a block diagram showing a control rod coil current control system coil current monitoring system according to the present invention.

Figure 2 is a block diagram for performing the automatic acquisition and analysis of the coil current signal according to the present invention.

Figure 3 is a block diagram showing the control rod drive automatic detection logic in accordance with the present invention.

4 is a block diagram showing filtering logic of an acquisition waveform according to the present invention;

5 is a block diagram showing control rod drive sequence pattern coding logic according to the present invention;

6 is a block diagram showing control rod drive sequence determination logic in accordance with the present invention.

7 is a block diagram showing the control rod driving reference waveform auto-generating logic according to the present invention.

8 is a block diagram showing logic for calculating control rod drive waveform agreement in accordance with the present invention;

9 is an MMI configuration diagram for each mode according to the present invention.

10 is a screen window showing a basic screen of the coil current monitoring system according to the present invention.

11 is a screen window showing a coil current monitoring system manual analysis mode screen according to the present invention.

<Code Description of Main Parts of Drawing>

100 ... Signal Controller 200 ... Signal Acquisition Controller

300 Network hub 400 Surveillance analysis controller

500 ... Power Control Box

Claims (17)

A control rod drive control system coil current monitoring system that analyzes a current signal flowing through a coil of a control rod drive device of a nuclear power plant, and displays, alarms, and records the result thereof. A signal controller 100 for amplifying, filtering and isolating the coil current signal to be; And a data acquisition card for converting the analog signal received by the signal controller 100 into a digital signal and temporarily storing the signal in a memory. The analog-digital conversion, temporary storage, signal processing of the signal acquired by the signal controller 100 and A signal acquisition controller 200 for transmitting; A network hub 300 connected to the signal acquisition controller 200 and having a plurality of ports to selectively expand the acquisition signal; And An output device 410 for outputting measurement results and data to one side, an uninterruptible power supply 420, and a display unit 430 for displaying analyzed data and graphs are further connected to acquire signals through the network hub 300. Monitoring or analysis controller that transmits a control signal and a set value to the signal acquisition controller 200 according to an appropriate range for the result obtained by receiving, storing, and analyzing the data transmitted from the controller 200 according to the appropriate range. Coil current monitoring system for a control rod drive system control system comprising a unit (400). delete delete A control rod drive system control system coil current monitoring method, comprising: a first step of inputting a control command to set an operation mode; In the case of setting the continuous acquisition mode according to the setting of the first step, the buffer is checked and the acquired data is fetched, the file is created or added to an existing file, and when the monitoring mode is set, the buffer check and the acquired data are retrieved. A second step of inspecting a control rod operation driving flag; A third step of checking a file size, adding drawing data, and comparing the control rod operation sequence with a pattern when the control rod operation flag is in operation according to the second step; A fourth step of generating an alarm if the control rod operation sequence and pattern are abnormal according to the third step and determining the control rod driving state if the control rod operation sequence is abnormal; And a fifth step of setting a stop start timer when the control rod is stopped after the fourth step, and setting a control rod stop flag when the stop duration is greater than the set value. Current monitoring method. The method of claim 4, wherein in the third step, when the control rod operation flag is stopped according to the second step, the coil currents of the upper and lower tongs UG and LG are stored in a file at regular intervals. (Low speed acquisition routine), and then, the coil currents of the upper and lower tongs are judged and an alarm is generated in case of abnormality. The method of claim 1, further comprising generating a file and setting a control rod operation flag. 5. The method of claim 4, wherein the step of switching to the monitoring mode of the second step includes: a range out of alarm is generated when the range of the input signal is out of an appropriate range, regardless of whether the control rod is driven, and notified to the user and recorded in the log. A control rod drive system control system coil current monitoring method further comprising a departure signal detection and alarm logic step. The method of claim 5, wherein the step of determining the coil current of the upper and lower tongs of the third step, the current signal to the upper tong (UG) or lower tongs (LG) holding the control rod in the non-driven state of the control rod In the case of exceeding the upper / lower limit setting area, the UG / LG coil current abnormal signal detection and alarm logic step of generating high level and low level alarms for the coil of the CEDM and recording the result in a log file are further included. Control rod drive system control system coil current monitoring method. The method of claim 5, wherein the determining of the driving state of the control rods in the third and fourth steps comprises: detecting the change state of the obtained coil current signal, differentiating the current signal for each coil, and tracking the slope of the waveform to determine whether to drive. Control rod drive system control system coil current monitoring method characterized in that it further comprises the step of determining whether the control rod to determine whether. The method of claim 4, wherein the comparing of the control rod operation sequence and the pattern of the third step comprises: removing and flattening a component having a specific frequency or more included in the acquired waveform to make it easier to compare with the reference waveform of the system. For a signal acquired at 2000 points per second before performing the waveform conformance analysis, the filter logic step further includes a 33 point moving average to remove frequency components of 6 OHz or more, and a 11 point moving average to remove frequency components of 180 Hz or more. Coil current monitoring method of the control rod drive device control system characterized in that the. 10. The method of claim 9, wherein the filtering logic step comprises dividing the filtered waveform by a signal level setting value for a waveform of one cycle, giving a binary code to each coil signal, and combining the coiled waveforms in the order of coils, and then adding the hexadecimal numbers. The control rod drive system control system coil current monitoring method further comprises a drive sequence encoding and discrimining logic step for discriminating the stationary state, normal draw-out and insertion state, and various abnormal driving states of the control rod by comparing with the reference code. . The method of claim 10, wherein the driving sequence encoding and discriminating logic step comprises extracting one periodic waveform after filtration using a moving average only when it is determined to be a normal drawing and insertion sequence through the driving sequence discriminating logic step. Selecting a reference waveform made by storing, and calculating the error of the selected reference waveform and the currently acquired waveform, generating a reference waveform and waveform matching degree calculation logic step further comprising a control rod drive system control system coil current monitoring method. 5. The control rod drive device control system coil according to claim 4, wherein the operation mode selectively performs a state, environment, data analysis, standby, setting, monitoring, continuous, and analysis mode for performing automatic / manual conversion. Current monitoring method. The method of claim 12, wherein the standby mode is set to an initial state to check a basic state of the system. The system of claim 12, wherein the setting mode sets a predetermined system environment through data input by an administrator, and changes and stores the environment according to the set data value so that the system can be driven. Control rod drive system control system coil current monitoring method. The system according to claim 12, wherein the monitoring mode automatically analyzes data acquired in real time in a state where the system environment is determined by the setting mode, and determines whether driving is performed for each CEDM and whether there is an abnormality of a current signal. A control rod drive system control system coil current monitoring method, characterized in that the low speed acquisition routine. 13. The method of claim 12, wherein the continuous mode continuously displays the waveform of the CEDM specified based on data input in real time so that a user can check the waveform. The method of claim 12, wherein the analysis mode comprises a predetermined function (waveform reproduction, waveform reduction / enlargement, reference cursor, movement cursor display, deviation between cursors, point moving average value, waveform on / off) so that the stored data file can be analyzed. Off, overlapping function, partial extraction, etc.) and tools, through which the administrator can analyze the analyzed data.