KR100613598B1 - Method for logging event and monitoring in real time for control equipment of control rod drive mechanism of nuclear reactor - Google Patents

Abstract

Fault recording and real-time monitoring method for the control rod drive control device of the reactor according to the present invention,

a) initializing the power controller and reading the alarm index;

b) determining whether a failure has occurred;

c) if the failure has not occurred, storing the data before the failure in the data recording buffer before the failure while continuously updating the data recording buffer before the failure;

d) if a failure occurs, setting an event status to "1" and storing data after the failure in the failure data buffer;

e) setting the failure status to "2" when data storage before and after the failure occurs is completed;

f) moving the storage location of the normal data to the next ring buffer for storage of the normal data until the next failure occurs while setting the failure status to "zero";

g) dividing and processing the recording memory area into a plurality of areas for automatic storage of several events, and assigning a unique number to each fault for selective calling by the operator; And

h) checking the requirements of the DSP for communication and providing corresponding information.

According to the present invention, the fault information generated when the control rod is in operation is divided into before and after time points of the failure and recorded several times by the control rod drive controller, while at the same time in real time the abnormal phenomenon occurring in the control system of the control rod. By monitoring, it has the advantage of providing information necessary for checking the performance of the power controller itself and identifying the cause of the failure.

Reactor control rod, fault record, real time monitoring, power controller, data record buffer, fault data buffer, ring buffer

Description

Method for logging event and monitoring in real time for control equipment of control rod drive mechanism of nuclear reactor}             

1 is a view showing the configuration of a power box for a control rod drive control device of the three-coil type in which the method of the present invention is employed.

FIG. 2 is a diagram showing the configuration of a CPU board for a power controller in the power box of FIG. 1; FIG.

Figure 3 is a flow chart showing the execution process of the fault recording and real-time monitoring method for the control rod drive control device of the reactor according to the present invention.

4 shows a monitoring screen in a driver module in a real-time monitoring device (monitoring PC) for the implementation of the method according to the invention.

FIG. 5 is a diagram showing that information recorded when a failure occurs, implemented in a higher monitoring PC, is displayed on a driver monitoring screen; FIG.

<Explanation of symbols for the main parts of the drawings>

101,108 ... power supply, 102-104 ... 3-phase half-wave rectifier

105 ... lift coil 106 ... gate driver

107 ... upper control box (MCU) 109, 110 ... power controller

111 ... simulated RL load 112 ... simulated control rod drive

113 ... Transformer 200 ... DSP for Control

201 ... DSP for communication 202 ... DPRAM

203 ... A / D converter 204 ... NVRAM

205 ... Digital Logic Devices 206 ... D / A Converters

207 memory device 208 watch dog

Serial communication interface 210 Ring buffer

211 Local Reset 212 Real Time Clock

213 Real-time monitoring device (monitoring PC)

The present invention relates to a fault recording and real-time monitoring method for a control rod drive controller of a nuclear reactor, and in particular, the failure information generated when the control rod is in operation is divided into times before and after the failure and recorded by the control rod drive controller several times. On the other hand, the fault recording and real-time monitoring method for the control rod drive controller of the reactor that can provide information necessary for checking the performance of the power controller itself and identifying the cause of the failure by monitoring the abnormality occurring in the control system of the control rod in real time. will be.

In general, the control rod driving device of a nuclear reactor controls the nuclear output of a nuclear power plant by controlling the nuclear reaction of the nuclear reactor by drawing and inserting the control rod using an electromagnetic force. The control rod is drawn out and inserted in step units (usually 5/8 inch), and in order to move one step, a sequence of six to seven steps must be performed in sequence. If any one of the sequence operations does not perform properly mechanically or electrically, the control rod may not move or fall down. This situation is very important for safe operation of nuclear power plants and efficient use of nuclear fuel. Therefore, the confirmation of the sequence operation is the most important factor in the design and implementation of the control rod controller. Recently, in order to confirm the sequence operation, a method of determining the operation by signal processing the waveform of the current flowing through the coil has been used. This method employs differential operation, which is disadvantageous in that it is sensitive to noise.

The present invention was created in view of the above matters, and the fault information generated when the control rod is in operation is divided into time points before and after the occurrence of the fault and recorded several times by the control rod drive controller, while occurring in the control system of the control rod. The purpose of the present invention is to provide a fault recording and real-time monitoring method for control rod drive control device of a nuclear reactor that can provide information necessary for checking the performance of the power controller itself and identifying the cause of the failure by monitoring in real time.

In order to achieve the above object, the fault recording and real-time monitoring method for the control rod drive controller of the reactor according to the present invention,

a) initializing the power controller and reading the alarm index;

b) determining whether a failure has occurred;

c) if the failure has not occurred, storing the data before the failure in the data recording buffer before the failure while continuously updating the data recording buffer before the failure;

d) if a failure occurs, setting an event status to "1" and storing data after the failure in the failure data buffer;

e) setting the failure status to "2" when data storage before and after the failure occurs is completed;

f) moving the storage location of the normal data to the next ring buffer for storage of the normal data until the next failure occurs while setting the failure status to "zero";
g) dividing and processing the recording memory area into a plurality of areas for automatic storage of several events, and assigning a unique number to each fault for selective calling by the operator; And
and h) checking the requirements of the DSP for communication and providing corresponding information.
According to the present invention, a control digital signal processor in a power controller used in a control rod drive controller detects all kinds of abnormalities occurring in the entire power box, and when various abnormalities occur, various memories (SRAM and NVRAM) in the control board are detected. Data recording for several seconds before and after an abnormal phenomenon and an intermittent or continuous abnormality are automatically recorded in a nonvolatile memory (e.g. NVRAM) several times, and then through a monitoring digital signal processor, such as a real-time monitoring device. It was able to respond to the request.
In addition, the present invention allows the recording / playback mode switching to be automatically handled in a periodic timer interrupt mode. For example, if an event (failure or abnormality) occurs while the control rod is operating, the processor will automatically save the data before and after the event for a specified time in the non-volatile memory and automatically return to normal data acquisition mode after the storage is completed. At this time, the control digital signal processor informs the monitoring digital signal processor by using the DPRAM that the event has occurred and the data recording before and after the event has been completed. Then, the monitoring digital signal processor periodically checks the information of the DPRAM. It reads and maintains the information related to the occurrence of the event from the control DSP and transmits the desired data when the real time monitoring device or the like requests.
This series of work was done through the protocol of control DSP and monitoring DSP through mailbox allocation of DPRAM and serial communication (RS485) of real time monitoring device and monitoring DSP.

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

1 is a view showing the configuration of a power box for a three-coil control rod drive control device employing the method of the present invention.

Referring to FIG. 1, the power box for the control rod drive controller of the three coil type (stop tong coil, moving tong coil, raising coil) supplies power to the redundant power supplies 101 and 108 and three types of coils. 3-phase half-wave rectifiers 102 to 104, redundant power controllers 109 and 110, a simulated RL load 111, a simulated control rod drive device 112, and the like. The main function of the power box is to receive an operation command from the upper control box (MCU) 107 and to flow current into three types of coils in a predetermined order to insert and withdraw the control rod one step at a time. In the present invention, by using the redundant power controller 109, 110 to record the failure occurred during the operation of the control rod, and to transmit the recorded information to the driver quickly. The power box shown in Figure 1 is a configuration capable of driving up to 13 control rods, and thus can be driven up to five control rods with the redundant power controller 109 (110). In this process, information on several failures can be recorded according to the capacity of the nonvolatile memory (NVRAM) 204 (see FIG. 2). In FIG. 1, reference numeral 105 denotes a lift coil, 106 denotes a gate driver, and 113 denotes a transformer.

2 is a diagram showing the configuration of a CPU board for a power controller.

Referring to FIG. 2, the control DSP 200 and the communication DSP 201 are separated using two digital signal processors (DSPs) 200 and 201, and data between the two DSPs 200 and 201 is used. Transfer is made using the DPRAM 202. The control DSP 200 is responsible for the determination of the failure occurring during the operation of the control rod and the recording of the failure information. Information related to the three types of coils is input from a voltage / current sensor, and a determination is made on the occurrence of a failure in the control DSP 200 via the A / D converter 203. The information is recorded. The CPU board includes an A / D converter 203 for converting three coil voltages and 13 coil currents input from the outside into a digital value, and a digital signal processor for processing the digital signal converted by the A / D converter 203 ( 200, 201, a device 205 for logic implementation, a D / A converter 206 for converting a digital signal processed by the digital signal processor 200, 201 into an analog signal, and a storage element ( 207 and a serial communication interface 209 for communication with the real-time monitoring device 213. In FIG. 2, reference numeral 208 denotes a watch dog, 210 a ring buffer, 211 a local reset, and 212 a real time clock.

Figure 3 is a flow chart showing the execution process of the fault recording and real-time monitoring method for the control rod drive control device of the reactor according to the present invention.

Referring to FIG. 3, according to a fault recording and real-time monitoring method for a control rod drive controller of a nuclear reactor according to the present invention, first, the power controller is initialized and an alarm index is read (S301). That is, until the initialization of the power controllers 109 and 110 is finished, it is not determined whether a failure occurs. The initial event status is "0 (zero)" and stores the signal value in the ring buffer 210. Then, it is determined whether or not a failure occurs in accordance with the progress of the control program (S302). In this determination, if a failure has not occurred, the data before the failure is stored in the data recording buffer (ring buffer) 210 before the failure, and the data recording buffer 210 is continuously updated before the failure ( S303). When a failure occurs, the failure state is set to " 1 " (S304), and data after the failure has been stored in the failure data recording buffer (S305, S306). At this time, determination of the occurrence of another failure is not possible since the failure state is " 1 ".

When data storage before and after a failure occurs is completed, the failure state is set to "2" (S307). Then, the storage location of the normal data is moved to the next ring buffer 210 to store the normal data until the next failure occurs (S308, S309). Then, the failure state is set to "0 (zero)" (S310). Here, in this way, setting the fault state back to "0" is to enable determination of a new fault occurrence.

In this way, when the operation of setting the failure state to "0" is completed, the failure occurrence order is determined for selective storage, recording, and recall (S311). Thereafter, the data obtained by the method of the present invention as described above, when requested, checks and services the requirements of the DSP for communication (S312). That is, it checks the requirements of the DSP and provides corresponding information such as alarm information, gain information, sensor scale information, voltage / current / control signal information, and the like.

In the series of processes described above, the number of fault information recording is determined by the storage capacity of the memory, and a record of several fault occurrences is stored according to the number of fault occurrences. In order to transmit the required fault information, the recorder will have the fault sequence information.

4 shows a monitoring screen in a driver module in a real-time monitoring device (monitoring PC) for the implementation of the method according to the invention.

Referring to Fig. 4, this shows three types of coil voltage, current instantaneous value manifestation and various individual fault information in normal operation. If a fault occurs, the fault menu will flash. In FIG. 4, an alarm for a card insertion failure in the host controller is displayed.

FIG. 5 is a diagram illustrating displaying information recorded when a failure occurs on a driver monitoring screen.

Referring to FIG. 5, the time at which the failure occurred and the number of times the failure occurred, the voltage / current actual value and the waveform are shown. The recorded waveform is the stored data when the failure of the double holding operation of the control rod occurs, and shows the stop pin coil current and the move pin coil current for 1 second before the failure and 1.5 seconds after the occurrence, mainly around 1 second.

As described above, the fault recording and real-time monitoring method for the control rod drive controller of the reactor according to the present invention can be divided by the control rod drive controller by dividing the fault information generated when the control rod is in operation before and after the failure occurs. By recording in turn and monitoring in real time anomalies occurring in the control system of the control rod, it is possible to provide the information necessary for checking the performance of the power controller itself and identifying the cause of the failure.

Claims (2)

a) initializing the power controller and reading the alarm index; b) determining whether a failure has occurred; c) if the failure has not occurred, storing the data before the failure in the data recording buffer before the failure while continuously updating the data recording buffer before the failure; d) if a failure occurs, setting an event status to "1" and storing data after the failure in the failure data buffer; e) setting the failure status to "2" when data storage before and after the failure occurs is completed; f) moving the storage location of the normal data to the next ring buffer for storage of the normal data until the next failure occurs while setting the failure status to "zero"; g) dividing and processing the recording memory area into a plurality of areas for automatic storage of several events, and assigning a unique number to each fault for selective calling by the operator; And and h) checking the requirements of the communication DSP and providing corresponding information. delete

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