JP2002071877A - Monitoring method, and apparatus thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To take abnormality avoiding countermeasures of a control rod drive mechanism(CRDM) for a nuclear reactor immediately at site without performing any analysis. SOLUTION: This monitoring apparatus 20 for monitoring the data obtained when the CRDM 1 is operated comprises a data acquiring means 24 for acquiring the operation data of the CRDM 1, an index generating means 25 for generating index information of the operation data from the operation data, a data storing means 26 for storing the operation data and index information in a related manner, a data extracting means 27 for extracting the predetermined data area from a top of the data out of the operation data stored by the data storing means 26 with an arbitrary index point listed in the index information stored in a related manner to the operation data as the convenient top of the data, and a displaying means 28 for displaying a single or a plurality of data areas extracted by the data extracting means 27 from the same operation data on the same graph comprising the X-axis indicating the time axis and the Y-axis indicating the data axis including the data value of the operation data.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to monitoring for monitoring data obtained during operation of a control rod driving mechanism for a nuclear reactor, which is a mechanism for driving a control rod used for controlling output in a nuclear power plant. More particularly, the present invention relates to a method and an apparatus therefor, and more particularly, to display a plurality of operation data acquired at different times with respect to a repetitively performed operation on the same graph so as to be superimposed on each other to thereby display an abnormal operation of a control rod drive mechanism for a reactor. And a monitoring method for finding such a device.

[0002]

2. Description of the Related Art Usually, a control rod drive mechanism for a reactor, which is a mechanism for driving a control rod used for controlling an output in a nuclear power plant, is installed on site during a periodic inspection performed between operation cycles. Perform an operation test and collect operation data.

[0003] The operation data is stored in a storage medium such as a floppy (registered trademark) disk, MO, CD, or magnetic tape, and the storage medium is transported to an analysis facility remote from the site where the analyzer is installed. Alternatively, an analyzer is carried from the analysis facility to the site to analyze the operation data.

In the analysis of the operation data, for example, an analysis is performed by an analyzer as disclosed in Japanese Patent No. 2511130 (registered on April 16, 1996). It is determined whether the furnace control rod drive mechanism is normal or abnormal.

[0005]

However, by using such an analyzer, the control rod drive mechanism for a nuclear reactor can be operated normally.
When determining an abnormality, there are the following problems.

In such an analyzer, the analysis processing is performed by digitizing the operation data with a predetermined time resolution. For this reason, it is extremely accurate, and it is possible to grasp not only abnormal operation data but also subtle data changes that cannot be recognized by field workers as numerical values, but it takes a certain amount of labor and processing time.

[0007] In spite of such subtle data changes, a series of operation data that can be clearly judged to be abnormal by comparing the series of operation data can be analyzed without using an analyzer. Discover it on site without omission,
It is desirable to be able to take immediate action. At the site, a data logger that outputs the collected data to roll paper is installed so that the collected operation data can be observed, but since this only outputs the collected operation data in chronological order, all data It is difficult to compare and find abnormal data points.

In general, the above-described analysis process quantifies the operation time inside the mechanism of the control rod drive mechanism for a reactor from operation data, and evaluates a margin from a threshold value for normal operation. By grasping the aging tendency of the control rod drive mechanism, it is effective for a long-term preventive maintenance plan.

On the other hand, it is first important to confirm that the control rod drive mechanism for the reactor has no abnormal operation at the site, and the quantitative evaluation of the operation time is that there is no significant change from the previous inspection. Can be confirmed, even if a rough accuracy value visually read by a field worker with an appropriate scale superimposed on the graph displaying the operation data is sufficiently effective.
Conversely, delaying the completion of the periodic inspection after waiting for the high-precision evaluation result by the analyzer leads to a decrease in the operation rate of the nuclear power plant, which is not desirable.

The present invention has been made in view of such circumstances, and superimposes a plurality of operation data acquired at different times on the same graph with respect to an operation repeatedly performed in a control rod driving mechanism for a nuclear reactor. If any abnormality is recognized from the superimposed display result, it is determined to be abnormal at the site, and measures can be taken to avoid the abnormality of the control rod drive mechanism for the reactor without waiting for the analysis result. It is an object of the present invention to provide a monitoring method and an apparatus therefor.

[0011]

Means for Solving the Problems In order to achieve the above object, the present invention takes the following measures.

That is, according to the first aspect of the present invention, there is provided a monitoring device for monitoring data obtained during operation of a control rod drive mechanism for a reactor, wherein the data acquisition means acquires operation data of the control rod drive mechanism for a reactor; Index generation means for generating index information of the operation data from the operation data obtained by the data obtaining means, and data for storing the operation data obtained by the data obtaining means in association with the index information generated by the index generation means From the operation data stored by the storage means and the data storage means, an arbitrary index point listed in the index information stored in association with the operation data is set as a head of data for convenience, and a predetermined data area is set from the head of the data. Data extraction means for extracting, Display means for displaying a single or a plurality of data areas extracted by the data extraction means from one operation data on the same graph having a horizontal axis as a time axis and a vertical axis as a data axis including data values of the operation data; Is provided.

According to a second aspect of the present invention, in the monitoring device of the first aspect, a partial time axis scale corresponding to the time axis is inserted at an arbitrary position on the graph superimposed and displayed by the display means. , A time axis scale inserting means for displaying on the display means superimposed on the graph.

According to a third aspect of the present invention, in the monitoring device according to the first or second aspect, the data acquisition means replaces the operation data of the control rod drive mechanism for the reactor with:
Obtain plant operation data.

According to a fourth aspect of the present invention, in the monitoring method for monitoring data obtained during the operation of the control rod driving mechanism for a nuclear reactor, the operation data of the control rod driving mechanism for a nuclear reactor is acquired, and the obtained operation data is used. Generating index information of the operation data, storing the index information and the operation data in association with each other, and setting any index point listed in the index information stored in association with the operation data as the head of the data for convenience, and the head of the data. , A horizontal axis is a time axis, and a vertical axis is a data axis including a data value of the operation data. Display on the same graph.

According to a fifth aspect of the present invention, in the monitoring method according to the fourth aspect of the present invention, a partial time axis scale corresponding to a time axis is inserted at an arbitrary position on the displayed graph, and is superimposed on the graph. indicate.

[0017]

Embodiments of the present invention will be described below with reference to the drawings.

(First Embodiment) A first embodiment of the present invention will be described with reference to FIGS.

FIG. 1 is a conceptual diagram showing an example of an overall configuration in which a monitoring apparatus to which the monitoring method according to the first embodiment is applied is applied to a pressurized water nuclear power plant, and is shown on the left side of the figure. The control rod driving device for a nuclear reactor (hereinafter, referred to as “CRDM”) 1 is disclosed in
No. 5912, and a lifting electromagnetic coil (L
F coil 3, movable gripper electromagnetic coil (MG coil) 4, fixed gripper electromagnetic coil (SG coil) 5
And

The currents of these coils 3 to 5 are CRDM
Since the signals are sent from the control panel 6 and returned to the CRDM control panel 6 again, equivalent voltage signals are respectively taken out from the monitor signal terminals 9a, 9b, 9c of the CRDM control panel 6.

An accelerometer 11 is provided in the housing 2 of the CRDM 1, and an operation sound of the CRDM 1 is detected by the accelerometer (operation sound detector) 11 and a charge amplifier connected to the accelerometer 11. The detection signal is taken out via the line 12.

Further, the control signal of CRDM1 is
It is taken out from the control signal terminal 13 of the control panel 6.

The voltage signals extracted from the monitoring signal terminals 9a, 9b, 9c and the control signal of the CRDM 1 extracted from the control signal terminal 13 are input to the CRDM monitoring device 20 after being insulated by the buffer amplifier 14. Like that.

The CRDM monitoring device 20 has an A / D
A converter 21, a personal computer 22, and a printer 23 are provided.

The A / D converter 21 digitizes the voltage signal and the control signal insulated by the buffer amplifier 14 and inputs the digitized signal to the personal computer 22. The analog data recorder 19 records a voltage signal and a control signal input to the A / D converter 21 as analog information. This is provided for backup.

FIG. 2 is a functional block diagram showing the functions of the personal computer 22.

As shown in FIG. 2, the personal computer 22 includes a data acquisition unit 24, an index data generation unit 25, a data storage unit 26, a data extraction unit 27, and a screen display unit 2.
8, a display screen 29, and a data output unit 30.

The data acquisition section 24 acquires operation data and digital data of control signals output from the A / D converter 21.

FIG. 3 shows the operation data L of the CRDM 1 output from the A / D converter 21 to the data acquisition unit 24.
It is a schematic diagram which shows the typical time-dependent trend of F coil current data (LF), MG coil current data (MG), SG coil current data (SG), and operation sound data (SD).

Is a time related to the ascent operation of the movable gripper, and a time LF1 at which the LF coil current rises,
It is determined from the difference from the time when the operation sound SD3 emitted when the movable gripper is completely lifted is detected.

Is a time related to the lowering operation of the movable gripper, and a time LF2 at which the LF coil current starts to lower.
And the time during which the operation sound SD6 generated when the movable gripper is completely lowered is detected.

Is the time related to the holding operation of the movable gripper, and the time MG1 when the MG coil current rises,
It is determined from the difference from the time at which the operation sound SD1 emitted when the holding of the movable gripper is completed is detected.

Is the time related to the opening time of the movable gripper, and the time MG2 at which the MG coil current starts to decrease MG2
And the time when the operation sound SD5 generated when the movable gripper is completely released is detected.

Is the time related to the holding operation of the fixed gripper, and the time SG2 when the SG coil current rises,
It is determined from the difference from the time when the operation sound SD4 generated when the holding of the fixed gripper is completed is detected.

Is a time relating to the opening operation of the fixed gripper, and is a time SG1 at which the SG coil starts to descend;
It is determined from the difference from the time when the operation sound SD2 generated when the fixed gripper is completely opened is detected.

Is the time from the completion of holding the movable gripper to the start of opening of the fixed gripper, and the time during which the operation sound SD1 generated when the holding of the movable gripper is completed is detected, and SG
It is determined from the difference from the time SG1 at which the coil current starts decreasing.

The time from the completion of holding the fixed gripper to the start of opening of the movable gripper is the time during which the operation sound SD4 emitted when the holding of the fixed gripper is completed is detected, and M
It is determined from the difference from the time MG2 at which the G coil current starts decreasing.

The details are disclosed in Japanese Patent Nos. 2511130 (registered on April 16, 1996) and 280330 (registered on July 31, 1998).

As shown in FIG. 4 (a), the data acquisition unit 24 of the personal computer 22 stores each operation data (LF: LF coil current, MG: MG) having a regular pattern as shown in FIG.
MG coil current, SG: SG coil current, SD: operation sound) are continuously obtained. The timing at which such a regular pattern appears is synchronized with the control signal,
The index data generation unit 25 of the personal computer 22 detects the arrival time of the control signal, and sequentially outputs the detected arrival times as index data to the data storage unit 26 together with each operation data.

That is, the index number shown on the upper horizontal axis of FIG. 4A is the number of times the rise of the control signal is counted, and the rise time of the control signal corresponding to the index number is listed as index data. You.

The data storage section 26 stores the respective operation data output from the data acquisition section 24 in association with the index data output from the index data generation section 25.

The data extraction unit 27 refers to the index data associated with each operation data stored in the data storage unit 26 and, as shown in FIG.
The 51st data group which is each data extracted as the first, the 52nd data group which is each data extracted as the 52nd, and the 5th data which is each data extracted as the 53rd
A region serving as a rule pattern unit is extracted from each motion data in the form of a third data group.

The screen display unit 28 displays a single or a plurality of areas of each operation data extracted by the data extraction unit 27, with the horizontal axis representing the time axis and the vertical axis representing the data axis containing the data values of the operation data. The data is superimposed on the graph and displayed on the display screen 29.

FIG. 5 is a schematic diagram showing an example of a graph superimposed on the display screen 29 and shown in FIG.
, The 51st data group, the 52nd data group, and 5
The third data group is superimposed and displayed on the same graph for each of the same type of operation data.

That is, the graph as shown in FIG. 5 is obtained by dividing any three consecutive data groups specified by the user from the operation data stored in the data storage unit 26 into the rule pattern of each data group. Are displayed on the display screen 29 so as to overlap.

The data output section 30 outputs the operation data displayed on the display screen 29 to the printer 23. Thereby, the printer 23 outputs the graph image or digital data displayed on the display screen 29.

As shown by arrows A and C in FIG.
The MG of the 52nd data group includes the other data groups (ie,
The behaviors are clearly different from the MGs of the 51st and 53rd data groups). Also, as shown by the arrow B, the operation sound SD of the 52nd data group at the same time clearly behaves differently from the operation sounds SD of the other data groups.
From this, in the 52nd data group, it can be determined that the operation that should have occurred at the position of arrow C due to some abnormality is occurring at the time of arrow A where the time T has elapsed.

Therefore, for an event that can be inferred to be abnormal by simply comparing the behavior of the operation data, at a stage before special analysis is performed in the analysis facility, FIG.
By creating a superimposition graph as shown in FIG. 5, any abnormalities can be recognized, and measures can be taken immediately.

Next, the operation of the monitoring apparatus to which the monitoring method according to the present embodiment configured as described above is applied will be described.

When the CRDM 1 operates, the LF coil current (LF) flowing through the electromagnetic coil (LF coil) 3 for elevation
However, the MG coil current (MG) flowing through the movable gripper electromagnetic coil (MG coil) 4 is changed to the SG coil current (SG) flowing through the fixed gripper electromagnetic coil (SG coil) 5.
Are sent from the CRDM control panel 6 and CR
It is returned to the DM control panel 6.

The currents (LF,
MG, SG) are taken out from the monitor signal terminals 9a, 9b, 9c of the CRDM control panel 6 as equivalent voltage signals, respectively, and sent to the buffer amplifier 14.

Also, the accelerometer 11 provided on the housing 2 of the CRDM 1 causes the operation sound (S
D) is detected, taken out as a detection signal via the charge amplifier 12, and sent to the buffer amplifier 14.

On the other hand, the control signal of CRDM1 is
The signal is taken out from the control signal terminal 13 of the control panel 6 and sent to the buffer amplifier 14.

Each signal sent to the buffer amplifier 14 in this way is insulated here and then input to the A / D converter 21 of the CRDM monitoring device 20, where the A / D
After the conversion, it is input to the personal computer 22.

At this time, the signal output from the buffer amplifier 14 is also output to the analog data recorder 19 in parallel with the output to the A / D converter 21, where it is recorded as backup data. .

Each of the digital data input to the personal computer 22 undergoes the following processing.

First, in the personal computer 22, the A / D converter 2
Each digital data output continuously from 1 is acquired by the data acquisition unit 24 for each data item.

At this time, the rise time (arrival time) of the control signal is detected by the index data generation unit 25 of the personal computer 22 from the digital data of the control signal output from the data acquisition unit 24, and the detected arrival time is calculated. The index data is output to the data storage unit 26 together with each operation data as a list.

The operation data output from the data acquisition unit 24 and the index data output from the index data generation unit 25 are stored in the data storage unit 26 in association with each other.

Each operation data stored in the data storage unit 26 is stored in the data area corresponding to one repetition operation from the arrival time listed in the index data stored in association with the operation data by the data extraction unit 27. Further, the extracted single or plural data areas are displayed on the display screen 29 by the screen display unit 28 as a graph having the horizontal axis as the time axis and the vertical axis as the data axis including the data value of the operation data. They are displayed superimposed.

In this way, a plurality of data areas are displayed in a superimposed manner on the same graph, and by finding data areas having different behaviors, a detailed analysis is not performed and the control rod for the reactor is used. An abnormality in the drive mechanism is found.

For example, as shown by arrows A and C in FIG. 5, the MG in the data area represented as the 52nd data group behaves clearly differently from the MGs in the other data areas. Since the same can be understood from the sound SD, it is determined that the operation of the control rod drive mechanism for the reactor has some abnormality in the 52nd data group, and the response to the abnormality is immediately performed. .

As a result, for an event in which the behavior of the operation data can simply be judged as abnormal by comparing the behavior of the operation data, as described above, a plurality of data areas of the operation data are obtained before the detailed analysis is performed in the analysis facility. By superimposing and displaying, it is possible to immediately recognize it at the site and take necessary measures.

Since such a quick response has been made possible, it is possible to observe the periodic inspection schedule and contribute to the improvement of the operation rate of the nuclear power plant.

The present invention is not limited to the present embodiment, but can be implemented in the following manner.

That is, in the present embodiment, the monitoring device is applied to a pressurized water nuclear power plant and the CRD
The operation data acquired from the M1 side is LF, MG, S
Although the case of G and SD has been described as an example, the plant to which the present invention is applied is not limited to the pressurized water nuclear power plant, but may be a boiling water nuclear power plant.

The control rod drive mechanism used in a boiling water nuclear power plant has a different structure from that of a control rod drive mechanism used in a pressurized water nuclear power plant. Type,
There is a type in which a control rod is inserted and withdrawn using an electric motor. For the former, water pressure data may be obtained as operation data, and for the latter, a current signal given to the electric motor or a torque measurement value of the electric motor may be obtained as operation data.

Further, it is clear that the technical concept of the present invention can be applied not only to nuclear power plants but also to general plants.

As described above, according to the present embodiment,
By the above-described operation, a plurality of pieces of data relating to the same operation acquired with respect to the control rod driving mechanism for a nuclear reactor can be superimposed and displayed on the same graph.

As a result, with respect to an event in which any abnormality is recognized from the superimposition result, it is possible to immediately take an abnormality avoidance measure at the site.

(Second Embodiment) A second embodiment of the present invention will be described with reference to FIGS.

The monitoring device to which the monitoring method according to the second embodiment is applied is different from the monitoring device to which the monitoring method according to the first embodiment is applied in addition to the functions provided by the monitoring device according to the first embodiment. At the location
A partial time axis scale corresponding to the time axis can be inserted and superimposed on the graph for display.

This function is realized by adding a scale display section 31 to the personal computer 22 in the first embodiment.

That is, FIG. 6 is a functional block diagram of the personal computer 22 of the monitoring device to which the monitoring method according to the present embodiment is applied, and FIG. 6 is a functional block diagram of the personal computer of the monitoring device to which the monitoring method according to the first embodiment is applied. A scale display unit 31 is added to the functional block diagram of FIG.

The scale display unit 31 inserts a partial time axis scale corresponding to the time axis into a graph at an arbitrary position on the display screen 29 based on the user's request, and displays the scale in a superimposed manner.

FIG. 7 is a schematic diagram showing an example of a screen in which a partial time axis scale is inserted into a graph and is displayed together with data. The symbols shown in the figure correspond to the symbols shown in FIG.

The symbol E shown in the figure is a partial time axis scale E inserted in the display screen 29 to measure the time corresponding to the completion of holding the fixed gripper. This is because, for example, the user uses the mouse (not shown) connected to the scale display unit 31 to display the SG on the display screen 29.
By clicking the rise time SG2 of the coil current, the display start point of the partial time axis scale E is designated,
Furthermore, by dragging the mouse in the time traveling direction (rightward on the paper), a time axis scale of the time axis corresponding to the rightward drag movement amount is displayed. The partial time axis scale E shown in FIG. 7 shows a case where the partial time axis is displayed from 0 to 150 (msec).

Further, it is possible to extend or shorten the partial time axis scale to be displayed or to delete the partial time axis scale E itself by dragging the mouse. Instead of a click or drag operation with a mouse, a partial time axis scale E can be displayed based on setting information in which a display start position and a display time width are prepared in advance.

The partial time axis scale F shown in FIG.
The rising time MG1 of the coil current is set to 0 (msec), and up to 150 (msec) is displayed, but here,
The purpose is to measure the time corresponding to the completion of holding the movable gripper, and it is not necessary to display 0 (msec) to 50 (msec). Therefore, by dragging the mouse on the time axis from 0 (msec) to 150 (msec) once displayed,
The time axis from (msec) to 50 (msec) is hidden.

Although not shown in FIG. 7, by dragging the mouse, for example, a partial time axis scale F
Can be displayed after 150 (msec).

Alternatively, based on the characteristics of the waveform of each data extracted from the data extracting unit 27, a program for determining the coordinates for inserting the partial time axis scale into the graph and the length of the time axis to be displayed is determined. Scale display section 31 in advance
When the data is displayed on the display screen 29, the partial time axis scale is automatically displayed on the display screen 29.
You may make it display above.

FIG. 8 is a diagram showing an example of a pre-designated event (~
13) is a schematic diagram showing an example of a screen in which a partial time axis scale is automatically inserted into a graph and displayed together with data. The symbols shown in the figure correspond to the symbols shown in FIG.

The partial time axis scales indicated by symbols G to L in the figure are the partial time axis scales automatically inserted corresponding to the respective events (（).

The information relating to the coordinates for inserting the partial time axis scale into the graph and the length of the time axis to be displayed, which are incorporated in the scale display section 31, are 200 (from the time CR1 when the rise of the control signal is detected). A partial time scale I of length msec) is displayed for the MG coil current. This is used to read the holding completion time of the movable gripper.

Next, a partial time axis scale L having a length of 200 (msec) from the time SG1 at which the SG coil current starts decreasing is displayed with respect to the SG coil current. This is used to read the release completion time of the fixed gripper.

Next, a partial time axis scale G having a length of 200 (msec) from the time LF1 at which the rise of the LF coil current starts is displayed with respect to the LF coil current. This is used to read the lift completion time of the movable gripper.

Further, a partial time axis scale K having a length of 200 (msec) from the time SG2 at which the rising of the SG coil current starts is displayed with respect to the SG coil current. This is used to read the holding completion time of the fixed gripper.

Further, a partial time axis scale J having a length of 200 (msec) from the time MG2 when the MG coil current starts decreasing is displayed with respect to the MG coil current. this is,
Used to read the release completion time of the movable gripper.

Finally, a partial time axis scale H having a length of 300 (msec) from the time LF2 when the LF coil current starts to decrease is displayed with respect to the LF coil current. this is,
Used to read the descent completion time of the movable gripper.

Note that the partial time axis scale as shown in FIGS. 7 and 8 can be displayed on a graph in which operation data of a plurality of cycles are superimposed as shown in FIG. It is possible to display any of the graphs displaying the operation data of the above.

The other configuration of the monitoring device to which the monitoring method according to the present embodiment is applied is as follows.
Since this is the same as that described in the first embodiment, a duplicate description will be omitted here.

Next, the operation of the monitoring apparatus to which the monitoring method according to the present embodiment configured as described above is applied will be described.

That is, in the monitoring device to which the monitoring method according to the present embodiment is applied, the operation data is displayed on the display screen 29 as described in the first embodiment.

Further, on the display screen 29, a program provided in the scale display unit 31 in advance is used.
Alternatively, by controlling the scale display section 31 based on user-specified information from a mouse (not shown), a partial time axis scale is inserted into the graph as shown in FIG. It is displayed over the operation data.

As a result, in addition to the effects obtained in the first embodiment, it is possible to quantitatively grasp the time of each event as shown in FIGS. 7 and 8.

As a result, the time of each event ascertained is
To be able to quantitatively compare with the value of normal operation data and to determine that there is no significant difference from the normal value and that there is no abnormal change from the analysis value of the previous operation data Becomes possible. That is, prior to conducting a detailed analysis at an analytical facility, evaluate whether the value of the operation data is within the normal range, immediately recognize abnormal changes at the site, and take necessary measures. Becomes possible.

The preferred embodiment of the present invention has been described with reference to the accompanying drawings, but the present invention is not limited to this configuration. Within the scope of the technical idea described in the claims, those skilled in the art can come up with various modified examples and modified examples, and these modified examples and modified examples are also within the technical scope of the present invention. It is understood that it belongs to.

[0098]

As described above, according to the present invention,
The multiple data related to the same operation acquired for the control rod drive mechanism for the reactor are superimposed and displayed on the same graph. It can be determined.

As described above, it is possible to realize a monitoring method and an apparatus capable of immediately taking measures for avoiding abnormality of the control rod drive mechanism for a nuclear reactor on site without performing a detailed analysis process.

[Brief description of the drawings]

FIG. 1 is a conceptual diagram showing an example of an overall configuration in which a monitoring device to which a monitoring method according to a first embodiment is applied is applied to a pressurized water nuclear power plant.

FIG. 2 is a functional block diagram of a personal computer of the monitoring device to which the monitoring method according to the first embodiment is applied.

FIG. 3 is a schematic diagram showing a typical time-dependent trend of LF coil current data (LF), MG coil current data (MG), SG coil current data (SG), and operation sound data (SD) which are operation data of CRDM. Figure

FIG. 4A is a schematic diagram showing an example of continuously displayed operation data, and FIG. 4B is a schematic diagram showing an example of each operation data in a certain cycle.

FIG. 5 is a schematic diagram showing an example of a graph superimposed and displayed on a display screen.

FIG. 6 is a functional block diagram of a personal computer of a monitoring device to which the monitoring method according to the second embodiment is applied.

FIG. 7 is a schematic diagram showing an example of a screen in which a partial time axis scale is inserted into a graph and is displayed together with data;

FIG. 8 shows events (-) designated in advance.
Schematic diagram showing an example of a screen in which a partial time axis scale is inserted into a graph and displayed with data superimposed

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Reactor control rod drive (CRDM) 2 ... Housing 3 ... Elevating electromagnetic coil 4 ... Movable gripper electromagnetic coil 5 ... Fixed gripper electromagnetic coil 6 ... CRDM control panel 9 ... Monitoring signal terminal 12 ... Charge amplifier DESCRIPTION OF SYMBOLS 13 ... Control signal terminal 14 ... Buffer amplifier 19 ... Analog data recorder 20 ... CRDM monitoring device 21 ... A / D converter 22 ... PC 23 ... Printer 24 ... Data acquisition part 25 ... Index data generation part 26 ... Data storage part 27 ... Data extraction unit 28 Screen display unit 29 Display screen 30 Data output unit 31 Scale display unit

Claims (5)

[Claims] 1. A monitoring device for monitoring data obtained during operation of a control rod drive mechanism for a reactor, wherein the data acquisition means acquires operation data of the control rod drive mechanism for the reactor, and the data acquisition means acquires the data. Index generation means for generating index information of the operation data from the obtained operation data; and data storage means for storing the operation data obtained by the data obtaining means and the index information generated by the index generation means in association with each other. From the operation data stored by the data storage means, any index point listed in the index information stored in association with the operation data is set as a head of data for convenience, and a predetermined data area is set from the head of the data. Data extraction hand to extract When a single or multiple data areas extracted by said data extracting means from the same operational data, the horizontal axis is the time axis,
A monitoring means for displaying on the same graph the vertical axis of which is a data axis including the data value of the operation data. 2. The monitoring device according to claim 1, wherein a partial time axis scale corresponding to the time axis is inserted at an arbitrary position on the graph superimposed and displayed by the display means. A time axis scale inserting means for displaying the time axis scale on the display means in superposition with the monitoring means. 3. The monitoring device according to claim 1, wherein the data acquisition unit acquires plant operation data instead of operation data of the reactor control rod drive mechanism. A monitoring device, characterized in that: 4. A monitoring method for monitoring data obtained during operation of a control rod drive mechanism for a nuclear reactor, comprising: obtaining operation data of the control rod drive mechanism for a nuclear reactor; and performing the operation based on the obtained operation data. Generates index information of data, stores the index information and the operation data in association with each other, and sets any index point listed in the index information stored in association with the operation data as the head of data for convenience, A predetermined data area is extracted from the beginning, and the horizontal axis includes the time axis, and the vertical axis includes the data value of the operation data, with the data area alone or together with a plurality of other data areas extracted from the operation data. A monitoring method characterized in that the data is displayed on the same graph composed of data axes. 5. The monitoring method according to claim 4, wherein a partial time axis scale corresponding to the time axis is inserted at an arbitrary position on the displayed graph, and is displayed so as to overlap the graph. A monitoring method characterized in that: