JPS6146794B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides various reactor state quantities such as reactor pressure, containment vessel pressure, suppression chamber pressure, condenser vacuum degree, main steam flow rate, and feed water flow rate in a boiling water reactor. The present invention relates to a reactor state quantity notification device for measuring feed water temperature, reactor water level, etc., and notifying operators of the same using a display or the like.

Conventional reactor status reporting devices include those that guide signals from measuring instruments to the central control room via signal converters and signal cables and display them on pointer-type indicators; There are devices in which a digital signal obtained by A-D conversion is processed by a process computer and output to a typewriter, line printer, or the like. However, all of these devices only display converted or processed signals, and do not go so far as to display the reliability of measured values. Therefore, the operator must judge whether the displayed measured value is truly reliable, and the burden on the operator is currently increasing.
In particular, when multiple measuring instruments are installed for a certain reactor state quantity, and there is a discrepancy between the measured values of those instruments, it is up to the operator to select reliable measured values. It will be imposed. In this case, an extreme discrepancy between the measured values may confuse the operator and lead to erroneous operation by the operator.

The present invention has been made in consideration of these circumstances, and its purpose is to evaluate the reliability of the measured values of the reactor state quantities and to notify the operators of this together with the measured values by means of notification such as a display. An object of the present invention is to provide a reactor state quantity reporting device that can accurately notify the state of a nuclear reactor.

Hereinafter, details of the present invention will be clarified with reference to embodiments shown in the drawings. FIG. 1 is a diagram showing the configuration of an embodiment of the present invention, and 1a, 1b to 1n are a group of measuring instruments. These measuring instrument groups 1a, 1b to 1n are a plurality of measuring instruments of the same type, ie, pressure gauges, etc., arranged to individually measure one type of reactor state quantity, for example, reactor pressure. Measuring instrument group 1a,
Each output terminal of 1b to 1n is connected to a signal converter 3.
It is connected to the input end of a computer 4 via signal cables 2a, 2b to 2n with cables 2a, 3b to 3n interposed therebetween. The electronic computer 4 is connected to a magnetic storage device 5, a cathode ray tube display (CRT) 6, and has a built-in program to be described later.
Each measurement signal generated by the measuring instrument groups 1a, 1b to 1n is amplified and converted by the signal converters 3a, 3b to 3n, respectively, and then led to the computer 4 via the signal cable, where it is processed by the computer's built-in program, which will be described later. Processed by The processed results are displayed on a cathode ray tube display (CRT) 6 as described below. The magnetic storage device 5 includes signal converters 3a, 3b to 3
It is used for temporary storage of the measurement signal amplified and converted by n and the processing results of the electronic computer 4.

FIG. 2 shows a flowchart of a program built into the electronic computer 4 shown in FIG. In FIG. 2, when a start signal is first applied, the i-th measurement signal Si amplified and converted by the signal converters 3a, 3b to 3n is read.
The comparison block 21 then verifies whether the magnitude of the signal Si is within the normal operating range of each measuring instrument. If there is a measuring instrument that is generating a measurement signal that is not within the normal operating range, the decision block 22 determines this as a malfunction and displays a message on the cathode ray tube display (CRT) 6 indicating that the measuring instrument is malfunctioning. Display messages to be sent. The above routine is performed for all the plurality of measuring instruments. When the verification of the measurement signals of the measuring instruments is completed, the deviation calculation block 23 calculates the deviation between the measurement signals of the plurality of measuring instruments for all combinations of two healthy measuring instruments that have not yet been determined to be faulty. calculate. Next, the deviation comparison block 24 compares the calculated deviation with a preset standard deviation e. If the deviation between the measurement signals of all the combinations of healthy measuring instruments is smaller than e, the average value calculation block 25 calculates the average value of the measurement signals of all the healthy measuring instruments, and takes this average value as a valid measurement value,
The value e at this time is displayed on the cathode ray tube display 6 as the reliability of the measured value. If there is a measuring device that shows a deviation between measurement signals that exceeds the standard deviation e, the deviation update block 26 updates the current deviation e plus the correction deviation Δe as a new standard deviation e', and again compares the deviations. Return to block 24. The maximum allowable deviation emax is set for the above deviation e′, and the deviation e′ is
If there is a combination of measuring instruments that exhibits a deviation between measured values greater than emax even after emax has been reached, the decision block 27 selects all the measuring instruments ( In comparison block 21, the measuring device that is generating the measuring signal that has a larger deviation from the average value of the measuring signal of the measuring device (which is within the normal operating range) is determined to be malfunctioning, and the operator is notified of the malfunction of the measuring device. message is displayed on the cathode ray tube display (CRT) 6. and after that
The deviation e' that has reached emax is initialized and returned to the deviation comparison block 24 again.

As described above, this program first verifies the magnitude of the measurement signal of each measuring device to detect a failure in each measuring device, and then compares the measurement signals of multiple measuring devices with each other. , determination of valid measurement values and reliability evaluation of the determined measurement values are performed. Further, this program is repeatedly executed at certain time intervals, and the processing results are sequentially displayed on the cathode ray tube display (CRT) 6 and also stored in the magnetic storage device 5.

FIG. 3 shows a display screen of the processing results of the above program displayed on the cathode ray tube display (CRT) 6. As shown in FIG. As shown in FIG. 3, the appropriate measured value 31 determined by the program 4 is displayed on a graph 32 with time on the horizontal axis and the measurement unit on the vertical axis, and the reliability 33 of the measured value is determined to be reasonable. It is displayed in a band shape around the measured value 31. A message 34 notifying the operator of the failure of the measuring instrument is displayed below the graph 32. In addition, the graph 32 is updated each time the program is repeatedly executed and valid measured values and their reliability are determined and evaluated, and constantly displays valid measured values and their reliability from the present to a certain period of time in the past. indicate.
The past processing results necessary for display are those stored in the magnetic storage device 5. This screen allows operators to easily know about detector failures.
In addition, since valid measured values and their reliability are displayed simultaneously on the same graph, operators can instantly and intuitively understand these values. Graph 32 of time
Since the horizontal axis is the horizontal axis of

Note that the present invention is not limited to the above-mentioned embodiment. For example, in the embodiments described above, a digital computer was used as an example, but an analog computer may also be used. Furthermore, although the case where the magnetic storage device 5 is provided separately is illustrated, a memory built into the computer may also be used. Furthermore, although a cathode ray tube display was shown as a notification means,
An electric light display, an audio alarm, etc. may be used alone or in combination. It goes without saying that various other modifications can be made without departing from the gist of the present invention.

As explained above, the reactor state quantity display device of the present invention uses an electronic computer to verify the magnitude of each measurement signal generated by a plurality of measuring instruments arranged for measuring a certain type of reactor state quantity. By mutually comparing each measured value, it is possible to detect failures in measuring instruments, determine the appropriate measuring instrument, evaluate the reliability of the measured values, and use the results on cathode ray tube displays, etc. The operator is notified by a notification means.

Therefore, according to the present invention, the failure of the measuring device detected, determined, and evaluated by the electronic computer program, the reasonable measured value, the reliability of the measured value, etc. are accurately reported, so that the operator can Not only can failures be easily detected, but when a cathode ray tube display is used as a notification means, appropriate measured values and their reliability can be instantly and intuitively recognized. In this way, we provide a reactor state quantity reporting device that can prevent operators from misoperating due to trusting unreliable measured values, and can ultimately improve the safety and reliability of the reactor. can.

[Brief explanation of the drawing]

The drawings are diagrams showing one embodiment of the present invention, in which Fig. 1 is an equipment layout diagram of a reactor state quantity display device, Fig. 2 is a flowchart of a computer built-in program, and Fig. 3 is a diagram showing an example of the present invention.
The figure shows the display state on a cathode ray tube display (CRT). 1a to 1n...Measuring instrument group, 2a to 2n...Signal cable, 3a to 3n...Signal converter, 4...Electronic computer, 5...Magnetic storage device, 6...Cathode ray tube display (CRT), 21 to 27... Flowchart constituent blocks, 31... Indication values of reasonable measured values,
32... Display graph, 33... Reliability of measured values,
34... Measuring instrument failure reliability notification message.

Claims (1)

[Claims] 1. A plurality of measuring instruments of the same type that measure one type of reactor state quantity, an electronic computer that processes each signal from these measuring instruments according to a predetermined signal processing program, and this electronic computer. a notification means for notifying the result of signal processing; This comparison block determines that a measuring device that is generating a measurement signal that is not within the normal range of operation is faulty, and the comparison block determines that the measuring device that is generating a measurement signal that is within the normal range of operation is A deviation calculation block that calculates the deviation between each measurement signal, a deviation comparison block that compares the deviation between measurement signals calculated by this deviation calculation block with a preset standard deviation, and a deviation comparison block that calculates the standard deviation. A deviation update block that updates the current standard deviation plus the correction deviation as a new standard deviation and returns it to the deviation comparison block when there is a deviation between measurement signals that exceeds the standard deviation; If there is a deviation between measurement signals that exceeds the maximum allowable deviation, the measurement signal that has the larger deviation between the two measurement signals and the average measurement signal value of all measuring instruments that have not yet been determined to be faulty. a determination block that determines that a measuring device that is causing the error is faulty; and an average value calculation block that calculates the average value of all measurement signals of the measurement device that shows a deviation between measurement signals that is smaller than the standard deviation in the deviation comparison block. A nuclear reactor state quantity reporting device characterized by being configured in combination.