JPS58165092A - Driving monitor device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] One aspect of the present invention is to monitor the drive of a detector that moves and scans inside a reactor core in order to obtain, for example, calibration data of a nuclear reactor output, neutron flux distribution data, etc. The present invention relates to a drive monitoring device.

[Technical background of the invention]

Generally, in consideration of safety, nuclear power plants monitor the output of the reactor using a reactor output monitoring instrumentation system or the like even during operation, and control the output to a predetermined level. As means for detecting this reactor power, there is a method in which a plurality of power system neutron detectors are arranged in the reactor core and the neutron flux in the reactor core is detected.

Usually, these power system neutron detectors are arranged at various locations in a plurality of tubes called guide tubes provided in the reactor core, and the total number reaches about 100 to 200. Naturally, these output neutron detectors have variations in sensitivity and shortened lifespan, and these must be accurately understood from the perspective of safe operation of the reactor. For this,
Another neutron detector is inserted into the guide tube and periodically collects accurate neutron flux distribution data in the reactor core, which serves as a criterion for calibration of the power system neutron detector. Therefore, movable in-core is usually used as such a collection method. Rope monitor (Trav@rsing Ineore P
A device called a TIP device (hereinafter referred to as a TIP device) is used. This TIP device will be explained using FIG. 1. In the figure, in the core of an Ifi reactor, there are usually multiple TIP devices for one core 1.
, j are installed.

The neutron detectors 4, 4' of the TIP devices 2, 3 are connected to the core 1.
A plurality of guide tubes 5~ can be swept from the top to the bottom of the
1,5' to 1'. In addition, these guide tubes 5~
Outgoing neutron detectors 8-1 to s are installed at various locations from 1,5' to 7'.
-n - In the figure, there are two TIP devices 2.
3, but since both have the same function,
The first TIP device 2 will be explained below. This first TIP device 2 is in charge of predetermined guide tubes 5 to 7 among the guide tubes of the core 1.
are brought together in one place by an indexer 9, and a drive line 11 is moved via the indexer 9 by driving a drive unit 10, which will be described later, to move the neutron detector 4 within the guide tubes 5 to 7. That is, the drive line 11 that transmits the drive to the neutron detector 4 is led out from the indexer 9 and connected to the isolation valve 12.
, explosion 4P13, the drive unit 10 through the shielding container 14
It is connected to the. And this drive unit 10FiTIP
It operates based on a signal from the control unit 15 indicating the detector and its position.

The second TIP device is similarly controlled by a signal from the TIP control section 15. In addition, 5' to 7' in the figure are guide tubes,
9' is an indexer, JO' is a drive unit, 11' is a drive line, 1
2' is an isolation valve, 13' is an explosion valve, 14' is a shielding vessel, and 16 is a part of the reactor-subcontainer.

With the above configuration, the TIP control unit 15 gives operation commands to each TIP device ``''' This is to obtain correct data.

Normally, there are over 100 power system neutron detectors in the reactor core, and there are several dozen guide tubes, although this varies depending on the scale of the reactor. A plurality of these guide tubes constitute one set, and each set is handled by a respective TIP device. Collection of calibration data using such a TIP device is performed slowly over a long period of time due to the nature of the measurement, and is performed at a frequency of about once every month. Therefore, during normal operation of the reactor, the shielding container 1.4*, J4' is pulled out and stored in order to prevent the sensitivity and life of the neutron detector from decreasing due to neutron irradiation. For this reason, due to the structure of the reactor, the guide tube has a long and curved shape as shown in Figure 1.Normally, the height of the reactor core is approximately 144 inches, and the distance from the curved part of the guide tube to the indexer is approximately 144 inches. It is approximately 850 inches. Additionally, the distance from the indexer to the guiding container is approximately 300 inches. The neutron detector will therefore be moved via the bend of the guide tube over a distance of at least said length.

[Problems with background technology]

By the way, in the TIP device described above, the driving state of the neutron detectors 4 and 4' can only be grasped during manual operation by an operator, and it is very difficult to grasp it at other times. For this reason, especially in devices that are automated to improve work efficiency, when moving the neutron detector 4.4', the neutron detector 4.4' is placed in the curved part of the guide tube 5-1.
If the neutron detector 4.4' gets stuck and becomes difficult to insert or withdraw, its discovery will be delayed and the neutron detector 4.4' will be left near the reactor core for a long time, resulting in significant deterioration of its characteristics. This will shorten the replacement life. In addition, in conventional automated equipment, as one means of monitoring abnormalities, there is a method that monitors abnormalities by determining whether the detection ends early or late based on the time required for a series of detection sequences. It is unclear whether there is an abnormality or not, and the detector cannot be left unused for a long time.

In addition, there may be cases where it becomes necessary to isolate the reactor if the abnormally operated neutron detector 4.4' remains undiscovered.
At this time, drive line 1.1, I J' is connected to explosion valve J 3,
J3' must be disconnected to operate the isolation valves 12 and 12', which disables the device itself.

[Purpose of the invention]

An object of the present invention is to provide a drive monitoring device that can detect drive abnormalities in a neutron detector such as a TIP device at an early stage, and facilitates drive automation.

[Summary of the invention]

In order to achieve the above object, the present invention provides a drive unit that moves a driven body at a required speed and outputs a signal when the driven body moves for each unit length; Long travel means a memory circuit that remembers the time,
A signal indicating the input timing of the previous signal stored in this memory circuit is read out at a predetermined time (φ delay time).

：,、Place・This time, there is a signal indicating input terminal □, 4-engine 2-o. i, :・t, □Eh, wow. 2. An alarm signal shall be obtained when the signals indicating the input timing of the current signal match, or when the previous signal input time is less than the current signal input time, and the moving speed of the driven object is slower than the required speed. A drive monitoring device that can detect whether the

[Embodiments of the invention]

The TIP device shown in FIG. 2 to which an embodiment of the present invention is applied! This will be explained using a lock configuration diagram. 2o is a neutron detector inserted into a guide tube (not shown) in the core. A drive line 21 for drive transmission, which also serves as a neutron flux signal line for transmitting a detected neutron flux signal, is connected to this neutron detector 20.

This drive line 21 is introduced into the drive section 22, and 'drive section 22
The neutron detector 20 is moved by driving. The drive unit 22 then sends the neutron flux signal i and the detector position signal of the neutron detector 20 to the TIP control unit 23.

A TIP control section 23fi, a neutron flux amplification circuit 24 that amplifies a neutron flux signal and processes predetermined data ml, and a drive control that controls drive speed switching, insertion/extraction, etc. for the drive section j2. 25, and a detector drive abnormality monitoring section 26 which receives a detector position signal from the drive section 22 via the drive control section 25 and outputs an alarm signal to the drive control section 25 if an abnormality occurs. Ru.

The drive control unit 26 also controls the drive speed of the neutron detector 20 (
The detector drive abnormality monitoring section 26 further includes an interrupt reception circuit 1# for determining whether the detector position signal is normal or abnormal, and an arithmetic processing circuit. A circuit 29, a memory circuit 30, and an alarm circuit 3 which outputs an alarm signal based on the signal from the arithmetic processing circuit 29 when the detector and position signal are determined to be abnormal are provided.

Next, the drive monitoring function of the TIP device configured in the above manner will be explained.

When the neutron detector 2# scans the guide tube in the reactor core to collect neutron distribution data, the extraction/insertion or position signal switching circuit 2- outputted from the drive control unit 25 determines the scanning speed (high speed/low speed). ), etc., the neutron detector 20 performs predetermined operations. At this time, the drive line 21 is sent as a position signal of the detector 20 from the drive unit 22.
Every time the θ unit length is moved, a base pulse signal having a width corresponding to the unit length is output to the drive control section 25.

This signal form is in the form of a BCD code or a pure decimal code. Now, we will specifically consider a 41 pulse signal as shown in FIG. 3 as a pure decimal code format. That is, Fig. 3(a) shows a Noyals signal with a width of 1 inch per 10 inches of the drive line 21, and Fig. 3(b) shows a Noyals signal with a unit length of 1 inch per 10 inches of the drive line 21. This is a pulse signal whose width indicates a unit length of 10 inches for each single digit of 100 inches.

Therefore, if the low speed drive selected by the position signal switching circuit 27 is 1.5 inches or the speed drive is 12 inches/1, the pulse signal width t1 and tlsn (a
) in t l, @ #670 ms and tB #83
m5, u tl, 1#6.71 and ts in the same figure (b)
* #830m5, the period of the pulse signal 'rt, s
and 'I'1m is u T1.1' in figure (m), #
6.7 s * Tll #830 ms In figure (b), Tl, 1 #671 * T11 #8-3 m.

Therefore, among the above-mentioned pulse signals, the notarus signal shown in Fig. 3(a) is used during low-speed driving, and the notarus signal shown in Fig. 3(b) is used during high-speed driving.
Suppose we use the nollus signal of Then, in the case of normal drive, the Norse signal is sent to the drive control unit 22 from the drive unit 22 approximately every 6.7 seconds during low-speed driving, and approximately every 8.3 seconds during high-speed driving.
5 to the interrupt reception circuit 2I. Therefore, the interrupt reception circuit 28 inputs an interrupt signal to the arithmetic processing circuit 29 every 6.7 seconds or about 8.3 seconds. In this case, the arithmetic processing circuit 29 is provided with a drive flag that is rewritten by interrupt signals that are sequentially input.
Further, the predetermined input time interval of the interrupt signal is set to 10 seconds to correspond to both approximately 6.7 seconds during low-speed driving and approximately 8.3 seconds during high-speed driving. and,:. The arithmetic processing circuit 29 is operated according to the flowchart shown in FIG.

,'” te～゛″Zf(l!-j!ni: 1t&IIJR11(
A) Judgment @) of the drive flag signal at that time is performed, and when it is e'1#, C) is rewritten to 0#, and when it is not l" (when it is 10#), " 1” is rewritten υ).

Then, the rewritten 0" or F'i""1# signal is stored in the storage circuit S0 and read out after 10 seconds @),
(b) will be carried out. Then, the read signal and the current drive flag signal are determined (a) and (b), and when they match, it is called abnormal drive (i), and when they do not match, it is called normal drive (J), that is, normal drive. This is because the Kfl drive flag is rewritten after 10 seconds regardless of whether the speed is low or high, and it is not rewritten during abnormal driving such as when the drive line 21 stops or moves extremely slowly. ) or (6), an alarm signal is output from the alarm circuit 31 and an alarm is displayed (9), and the drive control unit 25 can be made to perform necessary processing such as pulling out or stopping.

By the way, although the drive flag is used in the above embodiment, the same effect as in the seventh embodiment can be obtained by using the drive flag to directly store the interrupt signal input time in the arithmetic processing circuit 2g based on the normally used clock signal. To explain this according to the flowchart of FIG. 5, the arithmetic processing circuit 29 stores the current interrupt time T in the storage circuit 30 (B') when the interrupt occurs due to the position signal (B'), and then outputs the next interrupt signal. is input, the time added by 10 seconds to the previous memorized time (T+10
) is read out (C'), and the magnitude of the current time at the time of this reading and the time (T+10) is determined ω'). If the time (T+10) is large, normal driving (E') is performed, and if it is small, the drive is normal (E'). Abnormal drive (i').

This is because the time is stored with an advance of less than Fiio seconds during normal operation, so the current time is smaller than the time obtained by adding 10 seconds to the previous time every time an interrupt signal is input.
If it is large, it can be determined that the drive speed is slow for some reason.

In addition, in the above two embodiments, the predetermined interval time of the interrupt signal was set to 10 seconds, but a different kf/C was set for the low speed and high speed three movements.
However, if the scale of the reactor increases, the number of neutron detectors will increase, and if two types of predetermined interval times are set, the processing in the arithmetic processing circuit will become complicated. As in the above embodiment, the predetermined interval time is set to 1.
It's better to have one.

Further, in the above embodiment, one drive monitoring device is provided for one TIP device, but the drive monitoring device can be modified to accommodate a plurality of TIP devices without departing from the gist of the present invention.

In this way, when collecting calibration data for neutral flux distribution using a TIP device, etc., the automation that has been used in the past requires that the detection sequence of the neutron detection port be automatically Although the abnormality was determined based on the time required for the sequence, the drive monitoring device shown in the above embodiment can detect the abnormality immediately during the sequence, and can take early action.

According to the present invention, it is possible to automatically detect abnormalities in the operation of the core of a nuclear reactor, a neutron detector that collects calibration data of neutron flux distribution, and the like. Therefore, when collecting data using multiple channel numbers, when an abnormality occurs in one channel, the alarm output of this channel can be used to pull out the neutron detectors of other channels, and the abnormality can be detected. When stopping data collection operations to inspect channels, it is possible to prevent neutron detectors from other channels from being swept into the reactor core, and this is very effective in automating the scanning of neutron detectors in the core.

Furthermore, the arithmetic processing unit used for conventional automatic drive control of neutron detectors can be easily provided with a drive abnormality detection function, and an easy-to-implement drive monitoring device can be provided.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram of a conventional device, and FIG. 2 is a configuration diagram showing an embodiment of a TIP device applied to a drive monitoring device according to the present invention.
FIG. 3 is a diagram showing an example of a position signal of the drive monitoring device according to the present invention, FIG. 4 is a flowchart showing an example of processing of a position signal of the drive monitoring device according to the present invention, and FIG. 0, . . .: 1 is a flow circle chart showing an example of loosening processing of a position signal of a drive monitoring device. 21... Drive line, 22... Drive unit, 25... Drive control unit, 26... ... Drive abnormality monitoring unit, 28 ... Interrupt reception circuit, 29 ... Arithmetic processing circuit, 30 ... Memory circuit, 31 ... Alarm circuit. Applicant's agent Patent attorney Suzue-Takehiko,':: □□□':11:1. ．． ．． :, -5 1 Figure 4 Figure 5

Claims (1)

[Claims] a drive unit that moves the driven body at a required speed and outputs a signal when the driven body moves by unit length;
A memory circuit that stores a signal or time indicating the output timing of the previous signal outputted from the drive unit, and a memory circuit that stores the signal or time that indicates the output timing of the previous signal output from the drive unit, and reads out the stored signal or time with a predetermined delay time to determine the output timing of the current signal. means for comparing the signals indicating the output timing with a time, and the signals indicating the output timing match each other, or the time indicating the output timing of the previous signal is smaller than the time indicating the output timing of the current signal. A drive monitoring device characterized in that it obtains an alarm signal when