JP2611024B2 - Operation monitoring equipment for nuclear power plants - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Purpose of the Invention] (Industrial application field) The present invention relates to a nuclear power plant which detects the position of a control rod in a core, stores the detected position in a control rod position storage means, and outputs the result. It relates to an operation monitoring device.

(Prior Art) FIGS. 6A and 6B show an example of a mechanism for driving a control rod in a nuclear reactor in a nuclear power plant.

A large number of fuel rods PL are arranged in a predetermined arrangement in the core RC of the nuclear reactor NC, and a large number of control rods RD are arranged in a predetermined arrangement between the fuel rods PL.

Below each control rod RD, a drive mechanism DD for moving the control rod RD in the vertical direction and inserting and removing the control rod RD with respect to the fuel rod PL is provided.

The drive mechanism DD is fixed to the lower end of the control rod RD, and has a notch NT formed at a predetermined interval around the drive piston PA, and is locked to the notch NT to prohibit the control rod RD from moving up and down. It comprises a collect finger FG and a control rod drive control device CT for applying a water pressure to the upper or lower surface of the drive piston PA.

The control rod position detection probe SP detects the insertion position of the control rod RD, and the detection signal is applied to the control rod position indicating device DS.

The control rod position indicating device DS forms display information for displaying the insertion position of each control rod RD based on the detection signal input from the control rod position detection probe SP of the drive mechanism DD of each control rod RD. The display information is output to the display DP, whereby the display position of the control rod RD is displayed on the display DP.

The operator console OC is used to designate a control rod RD to be inserted and withdrawn, and its operation signal is applied to a control rod drive control device CT and a control rod position indicating device DS.

The control rod drive control device CT performs a commanded operation on the control rod RD commanded from the operator console OC, and when the insertion command is issued, the collect finger FG is temporarily removed from the notch NT, and the drive is performed. When the water pressure is applied to the lower surface of the piston PA and the time to move to the target position has elapsed, the application of the water pressure is stopped and the collect finger FG is locked to the notch NT.

At the time of pull-out command, with the collect finger FG removed from the notch NT, the water pressure is applied to the upper surface of the drive piston PA, and when the time to move to the target position has elapsed, the pressurization of the water pressure is stopped. , Collect finger
Lock the FG to the notch NT.

On the other hand, the operation monitoring of nuclear power plants is performed by monitoring equipment installed in the central monitoring room, and each control rod
RD insertion position information is also output to this monitoring device.
FIG. 7 shows an example of a configuration for outputting insertion position information to the monitoring device.

The control rod position indicating device DS reads out the number information RN of the control rod RD from which the position information has been read, the position information PP representing the insertion position of the control rod RD, and the values of the number information RN and the position information PP are determined and read. A read signal RE indicating that the control rod is in a possible state, and a control rod to be operated (hereinafter referred to as a control rod).
A drift signal DF indicating that the position information PP of the control rod RD other than the selected control rod RD is changing is output via the process input / output device PIO to the control rod position input means of the process computer PPU.

Further, an abnormal signal BS indicating that an abnormal state has occurred in the nuclear reactor NC is input to the all rod scan request means REQ of the process computer PPU via the process input device PIO.

The all-rod scan request means REQ generates an all-rod scan request signal RQ that instructs to input position information of all control rods RD when an abnormal signal BS is input from the reactor RC. The scan request signal RQ is
Output to control rod position input means PIP.

The control rod position input means PIP outputs the number information RD at the timing of inputting the read signal RD when the all rod scan request signal RQ and the drift signal DF are not input.
And the location information PP, and the entered location information PP
Is stored in the storage area of the memory MEM corresponding to the number information RD.

Also, all rod scan signal RQ or drift signal DF
While the scan mode signal SC is output, the scan advance signal AD is output in order to output the position information of each control rod RD from the control rod position indicating device DS while the scan mode signal SC is output. The position information PP input for the bar RD is stored in the storage area of the corresponding memory MEM. The scan mode signal SC and the scan advance signal AD are output to the control rod position indicating device DS via the process input / output device PIO.

The monitoring means PUN executes a monitoring process of the reactor NC based on the position information PP of each control rod RD stored in the memory MEM, and the CRT display device DSP stores the memory in the memory MEM. Based on the contents, a display screen such as an insertion position of each control rod RD is displayed and output.

When the position information PP is stored in the memory MEM, the control rod position input means PIP checks whether or not the value of the position information PP exceeds a predetermined range, and stores data in a format that can be displayed by the CRT display device DSP. Convert to

With the above configuration, when the reactor NC is operating normally and the all-rod scan request signal RQ and the drift signal DF are not output, the control rod position input means PIP outputs the scan mode signal SC and the scan advance signal AD. Are not output together.

In this state, when the position of the selected control rod changes at that time, the control rod position indicating device DS outputs the position information PP after the change and the number information RN representing the selected control rod, and outputs those information. When the read signal is
The RE is started (see FIGS. 8 (a) to 8 (e)).

As a result, the control rod position input means PIP outputs the read signal R
At the rising timing of E, the number information RN and the position information P
P is input, the input position information PP is checked, and the format is converted and stored in the corresponding storage area of the memory MEM.

In addition, when an abnormality occurs in the reactor NC and an abnormality signal BS is output, the all-rod scan request signal REQ is input from the all-rod scan request means REQ, and the drift signal is output from the control rod position indicating device DS. When DF is input, the control rod position input means PIP first raises the scan mode signal SC (see FIG. 9 (a)).

As a result, the control rod position indicating device DS
The mode shifts to the scan mode for sequentially inputting the RD position information.

Next, the control rod position input means PIP raises the scan advance signal AD for a predetermined time and then lowers the scan advance signal AD (9th.
Fig. (B).

Thereby, the control rod position indicating device DS starts reading operation of the position information PP of the control rod RD which is output first at the rising timing of the scan advance signal AD, and when the scan advance signal AD falls, at that time, The read number information RN of the read control rod RD and the position information PP obtained at that time are output, and the read signal RE is started when the value is determined (FIG. 9 (c),
(See (d) and (e)).

As a result, the control rod position input means PIP checks the position information PP input at that time, converts the format, and stores it in the storage area of the memory MEM corresponding to the number information RN input at that time.

When the input of the position information PP of one control rod RD is completed, the control rod position input means PIP again outputs the scan advance signal A
The control rod position indicating device DS is instructed so that D is started for a certain period and the next position information PP of the control rod RD is output.

As a result, the control rod position indicating device DS reads the position information PP of the control rod RD of the next number in the same manner as described above, and outputs it to the control rod position input means PIP.

When the above processing is completed for all control rods RD,
The control rod position input means PIP falls the scan mode signal SC to stop the scan mode.

In this way, when there is no abnormality in the reactor NC, each time the position information of the operating control rod RD changes, the information is input and the contents of the memory MEM are updated, so the CRT display device DSP , The display contents of the corresponding control rod RD change sequentially.

If any abnormality has occurred in the reactor NC, the position information of all the control rods RD is sampled,
The contents of the memory MEM are updated, and the positions of all the control rods RD after the driving operation corresponding to the abnormality are displayed on the CRT display device DSP.

(Problems to be Solved by the Invention) However, such a conventional apparatus has the following disadvantages.

That is, when an abnormality occurs in the reactor and the position information of all the control rods is captured as described above, the capture of the position information at this time is performed by a handshake between the scan advance signal and the read signal. However, it takes a very long time, and it takes a long time to display necessary information.

Also, when such an abnormal condition occurs,
Since a large number of monitoring processes of the process computer PPU occur, the processing load on the process computer PPU becomes very large, and there has been a problem that a smooth monitoring operation cannot be performed.

The present invention has been made in view of such circumstances,
An object of the present invention is to provide an operation monitoring device of a nuclear power plant that can quickly obtain control rod position information.

[Configuration of the Invention] (Means for Solving the Problems) The present invention relates to a nuclear power plant operation monitoring device that detects the position of a control rod in a reactor core, stores the detected position in a control rod position storage unit, and displays the output. A control rod position indicating device for inputting position information of an insertion position of each control rod,
The position information of each control rod is fetched from the control rod position pointing device, and the selected control rod information representing the selected control rod selected as the operation target by the operation monitoring device and the position information of all the control rods are transmitted in a predetermined cycle. Transmitting means, a temporary memory for temporarily storing position information on all control rods transmitted at the predetermined period from the transmitting means, and a case where the selected control rod is operated by the operation monitoring device. And updating the position information of the selected control rod in the control rod position storage means based on the position information of the selected control rod stored in the temporary memory according to the selected control rod information transmitted from the transmitting means. When there is a request for updating the position information of all the control rods stored in the control rod position storage means, all the control rods stored in the temporary memory are A second updating unit that updates the position information of all the control rods in the control rod position storage unit based on the position information; and a control unit that performs control based on the position information of each control rod stored in the control rod position storage unit. It is provided with monitoring means for displaying and monitoring the insertion state of the rod.

(Operation) Therefore, when the selected control rod is operated, only the position information of the selected control rod is updated, so that the processing can be sped up. When all the control rod position information is input, the temporary memory already taken in is read. Since the position information can be updated based on the stored contents, the operation of taking in all the control rod position information can be omitted, and the processing in this case can be speeded up.

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

FIG. 1 shows an example of a control rod position input device according to an embodiment of the present invention. Note that, in FIG. 7, the same parts as those in FIG. 7 and the corresponding parts are denoted by the same reference numerals.

The control rod position pointing device 1 samples the position information of each control rod RD at a predetermined cycle Ta (see FIG. 2 (a)), and the position information and the operation target at that time. A selected control rod number representing a control rod (hereinafter, referred to as a selected control rod) is output to the transmitting device 2, and a draft signal DF is output when the position information of a control rod other than the selected control rod is changing.

The transmitting device 2 transmits the position information and the selected control rod number input from the control rod position indicating device 1 to the receiving device 4 via the transmission line 3.

The receiving device 4 stores the position information and the selected control rod number input from the transmitting device 2 in the control rod position information table of the memory 5 of the process computer PPU. The data transfer from the receiving device 4 to the memory 5 is performed at a high speed by a DMA transfer function of a DMA (Direct Memory Access) controller (not shown).

Here, as shown in FIG. 3 (a), the control rod position information table stores the selected control rod number information for storing the selected control rod numbers and the control for storing the position information of each control rod in the order of the numbers. Consists of bar position data. The memory 5 also stores a previous value storage table for storing the position information of each control rod obtained at the previous sampling, as shown in FIG.

The control rod position input means 6 is an all rod scan request means.
In a state where the all rod scan request signal RQ is not input from REQ and the draft signal DF is not input from the control rod position indicating device 1 via the process input / output device PIO, a fixed period Tb (FIG. 2) (See (b)), and when the all-rod scan request signal RQ or the draft signal DF is input, the processing as shown in FIG. 4 is executed.

First, it is determined whether the all-rod scan request signal RQ or the draft signal DF has been input at this time (decisions 101 and 102).

When the result of both the judgment 101 and the judgment 102 is NO, the control rod position detection processing is executed (processing 103).

In this control rod position detection process, as shown in FIG.
The value of the selected control rod number information in the control rod position information table is set in a variable SID (process 201), and the position information of the selected control rod stored in the previous value storage table (PROD (SID))
Then, it is checked whether or not the position information (ROD (SID)) of the selected control rod stored in the control rod position information table matches (decision 202).

When the result of the determination 202 is YES, the flag FOH indicating that the position of the selection control rod is changing is set to 0 (process 203), and when the result of the determination 202 is NO,
The flag FOH is set to 1 (process 204), and this process ends, and the process returns to the original process.

When such a process 103 is completed, the value of the flag FOH becomes 1
It is checked whether is set (decision 104).

When the result of the determination 104 is YES, the position of the selection control rod has changed, so the value of the position information ROD (SID) is substituted for the position information PROD (SID) and the contents of the previous value position information table are updated. Update (process 105), check the value of the stored location information PROD (SID), convert the data into a format that can be processed by the CRT display device DSP, and convert the converted data to the CRT display device. It is stored in the display information area of the DSP (process 106).

Next, it is determined whether or not the value of the counter i storing the number of times of sampling matches the specified value m (decision 107).
When the result of the determination 107 is NO, the value of the counter i is increased by one (process 108), and this process ends. When the result of the judgment 104 is NO, the processing shifts to the judgment 107 without executing the processing 105 and 106.

When the result of the determination 107 is YES, the value of the counter i is cleared to 0 (process 109).

Next, after clearing the value of the counter j to 0 (processing
110), the position information PROD (j) of the j-th selected control rod stored in the previous value storage table and the position information of the j-th selected control rod stored in the control rod position information table
Check if ROD (j) matches (judgement 111), judge
When the result of 111 is NO, the value of the counter j is set to the variable S
It is checked whether the value matches the ID value (decision 112).

When the result of the determination 112 is NO, it means that the position of the control rod other than the selected control rod has been changed, so that the warning information indicating that the control rod is drafted is displayed on the CRT.
The information to be displayed on the display device DSP is formed and stored in the storage area of the corresponding memory MEM (process 113), and the position information PR
The content of OD (j) is updated to the value of the position information ROD (j), the value of the position information PROD (j) stored at that time is checked, and the data is converted into a format that can be processed by the CRT display device DSP. And convert the converted data to a CRT display device DSP.
(Step 114).

Then, the value of the counter j is increased by one (process 115).
It is checked whether or not the value of the counter j is equal to or greater than the number n of all the control rods (decision 116).

When the result of the determination 116 is NO, the process returns to the processing 111 to check the next control rod, and the result of the determination 116 is YES.
, This process ends.

When the result of the judgment 111 is YES, and when the judgment
When the result at 112 is YES, the process immediately proceeds to processing 115.

When the all-rod scan request signal RQ is input and the result of the determination 101 is YES, for example, after waiting for the time until the operation of pulling out all the control rods is completed (process 117), For the bar, the contents of the control rod position information table are set to the contents of the previous value storage table (process 118).

Then, while checking the value of the position information PROD of each control rod in the previous value storage table, the CRT display device DSP
Converts the data into a format that can be processed, stores the converted data in the display information area of the CRT display device DSP (process 119), and ends this process.

When the result of the judgment 102 is YES, the processing 10
Move to 9.

With the above configuration, in a state where the reactor NC is operating normally, the control rod position input means 6 checks whether or not the position of the selected control rod has changed every time the predetermined time Tb has elapsed. If it has changed, the contents of the previous value storage table are updated with the contents of the control rod position information table, and the display information of the CRT display device DSP is updated.

As a result, when the selection control rod moves, the positional information after the movement is displayed on the CRT display device DSP.

In addition, every m times of the processing executed every time Tb, it is checked whether or not the position of all the control rods has changed. If the control rod that has detected the position change is other than the selected control rod, the control is performed. Judging that the rod is drafting,
The control rod is displayed as an alarm on the CRT display device DSP,
For the control rod, the contents of the previous value storage table are updated with the contents of the control rod position information table.

On the other hand, if an abnormality occurs in the reactor NC and the all-rod scan request signal RQ is output from the all-rod scan request means REQ, the control rod position input means 6 reads the value storage table for all control rods. Is updated with the contents of the control rod position information table, for example, the insertion positions of the control rods RD after the full pull-out operation are displayed.

When the control rod position indicating device 1 detects that a draft has occurred on any of the control rods RD and inputs a draft signal DF, each of the control rods RD
By comparing the contents of the previous value storage table and the contents of the control rod position information table, the control rod RD that has generated the draft is detected, and the alarm is displayed in the same manner as described above.

In this manner, in the present embodiment, to obtain the position information of all the control rods at the time of scanning all the rods, it is only necessary to access the control rod position information table of the memory 5. The burden is greatly reduced.

In addition, when inputting control rod position information from the control rod position indicating device, a path separate from the process input / output device is used, and received data from the transmission means constituting the path is stored in a memory at high speed by DMA transfer. 5, the processing load of this part of the process computer PPU is greatly reduced.

[Effects of the Invention] As described above, according to the present invention, in the operation monitoring device of a nuclear power plant, which detects the position of the control rod in the core, stores the position in the control rod position storage means, and outputs the display, Control rod position indicating device for inputting the position information of the insertion position of the control rod, and the selected control rod selected as the operation target by the operation monitoring device by fetching the position information of each control rod from the control rod position indicating device Transmitting means for transmitting the selected control rod information and the position information about all the control rods at a predetermined cycle, and temporarily storing the position information about all the control rods transmitted at the predetermined cycle from the transmitting means. When a temporary memory and a selected control rod are operated by the operation monitoring device, the temporary control memory is stored in the temporary memory according to the selected control rod information transmitted from the transmission unit. First updating means for updating the position information of the selected control rod in the control rod position storage means based on the position information of the selected control rod, and all the control rods stored in the control rod position storage means. If there is a request to update location information,
Second updating means for updating the position information of all the control rods in the control rod position storage means based on the position information of all the control rods stored in the temporary memory; and storing in the control rod position storage means Based on the position information of each control rod, a monitoring means for displaying and monitoring the insertion state of the control rod is provided.When the selected control rod is operated, only the position information of the selected control rod is updated. Can be faster,
In addition, when there is input of all control rod position information, the position information can be updated based on the stored contents of the temporary memory that has already been taken, so that the operation of taking in all control rod position information can be omitted, In this case, the processing can be speeded up.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a control rod position input device according to an embodiment of the present invention. FIG. 2 (a) is a time chart illustrating data transfer timing from the control rod position indicating device, and FIG. 3 is a time chart illustrating the processing start timing of the control rod position input means, FIG. 3 (a) is a schematic diagram showing an example of a control rod position information table, and FIG. 3 (b) is a schematic diagram showing an example of a previous value storage table. FIG. 4, FIG. 4 is a flowchart showing an example of processing by the control rod position input means, FIG. 5 is a flowchart showing an example of control rod position change detection processing,
6 (a) and 6 (b) are schematic diagrams showing an example of a control rod driving function, FIG. 7 is a block diagram showing a conventional example of a control rod position input device, and FIG. 8 is a normal data input timing. FIG. 9 is a time chart showing the data input timing at the time of scanning all the rods. DESCRIPTION OF SYMBOLS 1 ... Control rod position indication device, 2 ... Transmission device, 3 ... Transmission line, 4 ... Receiving device, 5 ... Memory, 6 ... Control rod position input means, PPU ... Process computer, PIO ... Process input / output device, PUN ... Monitoring means, DSP ... CRT display device.

Claims (1)

(57) [Claims] In a nuclear power plant operation monitoring device for detecting the position of a control rod in a core, storing the detected position in a control rod position storage means, and displaying and outputting the information, position information on the insertion position of each control rod is input. The control rod position indicating device, the selected control rod information indicating the selected control rod selected as the operation target by the operation monitoring device by taking the position information of each control rod from the control rod position indicating device, and all the control rods Transmitting means for transmitting the position information of the control rod at a predetermined cycle; temporary memory for temporarily storing position information of all control rods transmitted at the predetermined period from the transmitting means; and a control rod selected by the operation monitoring device. If you are operating
A first updating unit that updates the position information of the selected control rod in the control rod position storage unit based on the position information of the selected control rod stored in the temporary memory according to the selected control rod information transmitted from the transmitting unit; An update unit, when there is a request to update the position information of all the control rods stored in the control rod position storage unit, the control based on the position information of all the control rods stored in the temporary memory. Second updating means for updating the position information of all the control rods in the rod position storage means; and displaying and outputting the inserted state of the control rods based on the position information of each control rod stored in the control rod position storage means. An operation monitoring device for a nuclear power plant, comprising monitoring means for monitoring.