JPH06308271A - Control rod extraction monitoring device - Google Patents

Abstract

PURPOSE:To quickly and accurately grasp the monitor information of multiple selective control rods by separately displaying the regions to which the selective control rods belong on the reactor core map of a nuclear reactor container. CONSTITUTION:The reactor core map data (basic pattern) are read out from a memory 27 and displayed on a data display section 28. When multiple control rods are selected by a control rod selection section 29, an identification display region is determined for each selective control rod by a region determination section 31. The detection signal and APRM 22 value of an LPRM detector 21 for each identification display region are fed to a channel selection section 23, and the RBM value of each selective control rod is calculated by an RBM value calculation section 24. When the color data corresponding to the type of the monitor level of each control rod are written into a memory 26 from a color code processing section 32, the identification display region on a map is displayed in each color. A display shape determination section 33 determines the display shape of each selective control rod. When shape data are written into the memory 26, the selective control rod is displayed in the symbol according to each type.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control rod withdrawal monitoring device used for monitoring the output region of a nuclear reactor, and more particularly to a multi-channel type control rod withdrawal monitoring device capable of simultaneously monitoring a plurality of control rods. Regarding the device.

[0002]

2. Description of the Related Art FIG. 4 shows the structure of an analog control rod pull-out monitor (RBM). An LPRM detector 3 is arranged around a plurality of control rods 2 arranged in a reactor containment vessel 1. Reference numeral 5 is a control rod drive device provided for each control rod 2.

The analog RBM currently in operation monitors only one control rod, and the detection signals of all LPRM detectors 3 arranged around each control rod are transmitted via the amplifier 5. It is taken in by RBM.

The RBM main body 7 calculates the RBM value from the average value of the LPRM signals selected from the detector signals and the average value of all LPRMs sent from the APRM 6, and the RBM value is calculated.
The control rod is being monitored to ensure that the value does not exceed the trip level. Then, if the RBM value exceeds the trip level, a pull-out prevention signal for preventing the pulling-out of the control rod is generated. The information of the selection control rod is input to the RBM main body 7 from the reactor manual control system 8.

In such an analog type RBM, only the monitoring information on one control rod is displayed on one display. By the way, in a state-of-the-art nuclear reactor (ABWR), which is currently in the design stage, a plurality of control rods are simultaneously pulled out or inserted in order to shorten the time required for starting up or shutting down the reactor. Therefore, a digital multi-channel RBM (hereinafter referred to as MRBM) capable of simultaneously monitoring a plurality of control rods has been developed.

5 and 6 show examples of the structure of the MRBM.
Note that FIG. 6 shows the appearance of the MRBM. The detection signal from each LPRM detector 3 is input to the LPRM unit 11, and the output of the LPRM unit 11 is input to the APRM unit 12 together with the detection signal. In the MRBM unit 13, the RB of the selected control rod is selected based on the average calculated value of the APRM unit 12 and the LPRM detection signal, which is selected based on the control rod selection signal input from the control rod selection unit 14.
The M value is calculated.

Since the MRBM unit 13 has a plurality of control rods to be monitored at the same time, the monitor information of all selected control rods is displayed on the EL display 15. The monitoring information to be displayed on the EL display 15 includes the control rod position (X, Y coordinates), the monitoring level, each LPRM status,
The RBM value, alarm information (about 10 types), bypass status of each LPRM, control rod type (strings), and the like.

These pieces of monitoring information relate to one control rod. If many control rods are selected at the same time,
It is necessary to display the above-mentioned monitoring information regarding the selection control rod on the EL display 15.

Further, in the ABWR, regarding the trip of the MRBM, a condition for limiting the number of LPRM bypasses on a plane horizontal to the core axis is newly added, so that the in-core position information of the LPRM detector becomes an important trip condition.

However, in the conventional RBM, only the monitoring information on one control rod is displayed, so that the monitoring information of all selected control rods may be displayed on the EL display 15 at the same time in the same display format. When the number of selection control rods increases, the operator cannot grasp all the monitoring information. On the other hand, if only the monitoring information of one control rod is displayed, the other selected control rod cannot be monitored. The position coordinates of the selected LPRM detectors selected corresponding to the selected control rods are expressed numerically (conventional method), and when the number of control rods increases, the core of the LPRM detectors around the selected control rods It becomes difficult to know the position.

[0011]

As described above, since the MRBM for simultaneously monitoring a plurality of control rods increases the monitoring information, each monitor information of all selection control rods is displayed in the EL display in the same display format as the conventional RBM. It ’s displayed on top of 15.
It is difficult to grasp each monitoring information quickly and accurately, which may lead to deterioration in operability.

The present invention has been made in view of the above situation, and displays the monitoring information related to the selection control rods on the core map so that the monitoring information of a plurality of selection control rods can be quickly and accurately displayed. It is an object of the present invention to provide a control rod pull-out monitoring device that can be grasped in detail and has improved operability.

[0013]

In order to achieve the above object, the present invention corresponding to claim 1 is arranged around a selection control rod of a plurality of control rods arranged in a reactor containment vessel. In a control rod pull-out monitoring device for performing signal processing of a detection signal of an LPRM detector for monitoring, a means for displaying a core map of a reactor containment vessel and the selection on the core map displayed by this display means. An identification display means for distinguishing and displaying the area to which the control rod belongs is provided.

According to a second aspect of the present invention, in addition to the configuration of the control rod pull-out monitoring device, means for selecting at least one control rod from the selected control rods on the core map, and this selecting means. LP around the control rod selected by
The RM detector is three-dimensionally displayed, and the LPRM detector displayed by the three-dimensional display means is separately displayed according to the operating condition.

[0015]

In the present invention corresponding to claim 1, the core map of the reactor containment vessel is displayed by the display means, and when the control rod is selected, the identification display means causes the area to which the selected control rod belongs. Are displayed separately.

In the present invention corresponding to claim 2, when at least one control rod is selected by the selecting means from the selection control rods displayed on the core map, LPRM detection around the selected control rod is performed. The vessel is three-dimensionally displayed by the three-dimensional display means. Then, according to the operation status of the LPRM detector displayed by the stereoscopic display means, for example, according to the bypass status, the corresponding LPRM detector is displayed separately.

[0017]

EXAMPLES Examples of the present invention will be described below. FIG. 1 shows a functional block of an MRBM according to an embodiment of the present invention, and FIGS. 2 and 3 show a core map and a selected LP.
A display example of an RM stereoscopic view is shown. Note that the nuclear reactor targeted by this embodiment is assumed to have 205 control rods arranged in the reactor containment vessel and 208 LPRM detectors arranged around the control rods.

The LPRM detectors 21-1 to 21-n use fission counters and output a neutron flux detection signal. The detection signals of the corresponding LPRM detectors 21-1 to 21-n are input to the APRM units 22-1 to 22-m, and the average calculated value of the detection signals and the detection signals are output.

The channel selection unit 23 is used for all APRMs.
The outputs of the units 22-1 to 22-m are input, and the detection signals of the LPRM detectors within the monitoring area determined by the area determining unit, which will be described later, and the output of the average calculated value of the corresponding APRM units are output from the outputs. Only the selected value is sent to the RBM value calculation unit 24.

The RBM value calculation unit 24 is preset with a monitoring level (status: normal position, middle, low) for each control rod, processes the signal input from the APRM unit, and selects the RBM of the selected control rod. The value is calculated. Then, when the RBM value of the selected control rod exceeds the monitoring level set for the corresponding control rod, a trip command is issued to the trip output unit 25.

On the other hand, the memory 26 stores core map data for displaying the core map shown in FIG.
Another memory 27 stores LPRM stereoscopic map data for displaying the stereoscopic map shown in FIG. The core map data and LPRM stereoscopic map data in the memories 26 and 27 can be selectively displayed on the EL display of the data display unit 28.

Here, the core map will be specifically described with reference to FIG. The core map of FIG. 2 schematically shows a horizontal cross section of the reactor containment vessel, and the horizontal axis indicates the X of the core.
The axis and the vertical axis represent the Y axis of the core. "Black circle" is LPR
The mounting strings position of the M detector is shown. The "cross" represents the control rod position. Since the number of selectable LPRM detectors around the selection control rod differs depending on the core position, its type (the number of selectable LPRM detectors) can be distinguished by a symbol. That is, the selected LPR
The control rods with 8 M detectors are "white circles", the control rods with 6 selected LPRM detectors are "squares", the selected LPRM detectors are 4
The individual control rods are represented by "triangles", and the control rods at the time of selection are represented by "X".

In the area adjacent to the core map on the EL display, the address number of each selection control rod,
The RBM value and the monitoring level (status) are displayed in a table format.

The shaded area in the core map of FIG. 2 indicates that the mounting strings of the LPRM detector in contact with the area are the mounting strings position of the selected LPRM of the selection rod in the hatching. For example, the selection LP for the selection control rod a
The strings position where the RM detector is mounted is b, c,
d and e.

The MRBM of this embodiment has a control rod selection unit 29.
A plurality of control rods are simultaneously selected by and the control rod selection signal is input to the area determination unit 31. The area determination unit 31 determines the monitoring area for each selection control rod according to the position coordinates of the selection control rod, and the monitoring area for each selection control rod is set to the channel selection unit 23, the color-coding processing unit 32, and the display shape determination unit 33. Send to. This shaded area is highlighted according to the monitoring level of the control rods in the area. Hereinafter, the shaded area is referred to as an identification display area.

The color code processing unit 32 is the RBM of each selection control rod.
The value and monitoring level are read in a predetermined cycle. The color-coding processing unit 32 determines the display color of each identification display area based on the monitoring level. Then, the determined color data is stored in the memory 26.
Writing to the address where each identification display area above is written. If the monitoring level changes, the display data in the identification display area is updated to the changed monitoring level color data.

In this embodiment, the low level is displayed in yellow, the intermediate level is displayed in green, and the normal position level is displayed in blue. Further, the color-coding processing unit 32 writes the RBM value of the selected control rod into the address of the area in which the RBM value of the control rod of the memory 26 is displayed, and the display data is sequentially updated according to the change of the RBM value.

Since the number of selectable LPRM detectors is determined from the LPRM strings in contact with the identification display area, the display shape determining unit 33 determines the display shape of each selection control rod based on the number of LPRM detectors (circle, square as described above). , Triangle, cross). Then, the determined display shape data is written in the position where the display data of the selection control rod of the memory 26 is written.

The instruction input section 34 is composed of a keyboard or the like, and is for receiving the operation of the operator. Figure 2
The movement of the reverse display part P and the development of the screen shown in are performed by the instruction input from the instruction input part 34.

The reversal / point reduction unit 35 reversely displays the address display unit of the control rod selected by the instruction input unit 34 in response to the instruction input from the instruction input unit 34, and the corresponding selection control on the core map. The display data for decrementing the bar display symbol is written in the corresponding address of the memory 26.

Further, the LPRM stereoscopic view display processing unit 36 executes the processing described later in order to display the LPRM stereoscopic view as shown in FIG. Next, the operation of this embodiment configured as described above will be described.

The core map data stored in the memory 27 is read out to the data display unit 28 at a predetermined cycle, and E
A core map as shown in FIG. 2 is displayed on the L display. The core map data first read from the memory 27 is a basic pattern. And the control rod selection unit 29
When a plurality of control rods are selected by, the area determination unit 31 determines the identification display area as indicated by the diagonal lines in FIG. 2 for each selection control rod.

When the identification display area is determined, the channel selection section 23 takes in the detection signal and the APRM value of the corresponding LPRM detector for each identification display area, and the RBM value calculation section 24 selects each selection control rod. The RBM value is calculated. RB
The monitoring level of each control rod to be compared with the M value is appropriately changed depending on the setup. Further, color data corresponding to the type of the monitoring level of each control rod is written from the color-coding processing unit 32 to the address of each identification display area on the memory 26. By this processing, the identification display area on the core map displayed on the EL display is displayed in a color corresponding to the monitoring level of each control rod. Further, the display shape determining unit 33 determines the display shape of the selection control rod by the above-described processing, and writes the determined shape data to the address of each selection control rod on the memory 26. By this processing, the selection control rods in each identification display area are displayed with symbols according to each type.

On the other hand, the address display section on the core map of the selected control rod selected by the instruction input from the instruction input section 34 is highlighted by the display inverting section P, and the control rod is displayed on the core map. The sign that is on the screen will decrease
In FIG. 2, the symbol indicated by "a" is reduced.

When the instruction input unit 34 requests the display of the LPRM stereoscopic view, the stereoscopic view of the selected LPRM detector selected corresponding to the control rod selected by the display reversing unit P at that time is displayed. It FIG. 3 shows a case where there are four mounting strings corresponding to the control rod selected by the instruction input unit 34.

When the control rod to be displayed is selected by the instruction input unit 34, the LPR selected around the control rod is selected.
The M detectors are identified and the mounting strings positions of those LPRM detectors are also known. Further, the bypass information of all LPRM detectors is stored in the database 37. The LPRM stereoscopic map display processing unit 36 creates LPRM stereoscopic map display data based on these pieces of information. That is, each selection LPRM detector is arranged around the selection control rod while maintaining the positional relationship of the mounting strings around the selection control rod, and the LPRM detector being bypassed is highlighted. LPR
The M stereoscopic view display processing unit 36 stores the display data thus created in the memory 27. Database 3
The contents of 7 are constantly updated.

When an LPRM stereoscopic view display request is issued from the instruction input unit 34, the display data in the memory 27 is read at a predetermined cycle and displayed on the data display unit 28. Therefore, the bypass as shown in FIG. An LPRM stereoscopic view in which only the LPRM detector in the inside is highlighted is displayed.

When the display screen is returned to the core map, the core map data in the memory 26 is displayed in the data display section 28.
And the screen returns to the screen shown in FIG. While the LPRM stereo map is displayed on the data display unit 28, the memory 27
Display data is updated in real time,
When returning to the screen of FIG. 2 again, the state at that time is displayed.

As described above, according to this embodiment, the position of the selection control rod, the type of the selection control rod, the position coordinates of the selection LPRM detector, the output value of each selection control rod, and the monitoring level are
Since the information is displayed on one screen in association with the core map, information on the entire core can be obtained from one screen, and visibility and operability can be improved.

Further, since the output level of each control rod, the presence or absence of trip, etc. are color-coded and displayed on the core map, it is possible to easily grasp a large amount of information, which also improves the operability. Planned.

For example, since the level of each selection control rod can be known without expanding it to another screen, the timing of level up can be easily grasped, and the setup operation can be completed with a small number of times.

Further, since the bypass state of the selected LPRM detector is three-dimensionally displayed for each control rod, the trip type at the time of MRBM trip can be easily grasped and the LPRM detector which can be bypassed for each control rod can be grasped easily. it can.

In the above embodiment, the core map and LPR
The case of switching between the M stereoscopic view and the display has been described, but the display may be expanded to other screens. For example, the detailed data (RBM value bar graph, selected LPRM value bar graph, control rod status display) of the control rod to be selected and output from the instruction input unit is displayed.
The present invention is not limited to the above embodiments, and various modifications can be made without departing from the gist of the present invention.

[0044]

As described in detail above, according to the present invention, the monitoring information related to the selection control rods can be displayed on the core map, and the monitoring information of a plurality of selection control rods can be grasped quickly and accurately. It is possible to provide a control rod withdrawal monitoring device with improved operability.

[Brief description of drawings]

FIG. 1 is a functional block diagram of a control rod pull-out monitoring device according to an embodiment of the present invention.

FIG. 2 is a core map diagram.

FIG. 3 is a stereoscopic view of LPRM.

FIG. 4 is a configuration diagram of an analog RBM.

FIG. 5 is a block diagram of a conventional MRBM.

6 is an external view of the MRBM shown in FIG.

[Explanation of symbols]

23 ... Channel selection unit, 24 ... RBM value calculation unit, 25
... Trip output section, 26, 27 ... Memory, 28 ... Data display section, 29 ... Control rod selection section, 31 ... Area determination section, 32
... color classification processing unit, 33 ... display shape determining unit, 34 ... instruction input unit, 35 ... inversion / point reduction unit, 36 ... LPRM stereoscopic view display processing unit, 37 ... database.

Claims (2)

[Claims] 1. An LPRM arranged around a selective control rod of a plurality of control rods arranged in a reactor containment vessel.
In a control rod pull-out monitoring device for performing signal processing of a detection signal of a detector for monitoring, a means for displaying a core map of a reactor containment vessel and the selection control rod on the core map displayed by this display means. A control rod pull-out monitoring device, comprising: an identification display unit that distinguishes and displays the regions to which it belongs. 2. A means for selecting at least one control rod from the selected control rods on the core map, and a means for stereoscopically displaying an LPRM detector around the control rod selected by the selecting means. 2. The control rod pull-out monitoring device according to claim 1, further comprising: a unit for displaying the LPRM detector displayed by the stereoscopic display unit while distinguishing the LPRM detector according to an operating condition.