JPH03296699A - Supporting equipment of operation of plant - Google Patents

Abstract

PURPOSE:To reduce the burden of an operator in a state of emergency and to attain improvement in the safety of a plant and the rate of operation thereof and others by providing an abnormality sign monitoring device, a decision device, a memory, a plant input device, a working memory and an output device. CONSTITUTION:Plant information on a process amount of a plant 100 being an object of support, an alarm signal, etc. is inputted by a plant input device 4 and an output thereof is recorded in a working memory 5. An abnormality sign monitoring device 1 and a decision device 2 are connected to this memory 5 and a construction is made so that the memory can be referred to by both of the devices. The output of the device 1 is connected to an input end of the device 2 and further a memory 3 is connected to the device 2. The output of the device 2 is connected to an output device 6. The device 6 furnishes an operator with support information on the result of diagnosis for support of decision produced in the device 2, an operation guide, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a plant operation support device that is applied to support a countermeasure when a failure occurs in a turbine feedwater pump speed control system in an atomic couplant.

[Conventional technology]

For example, in a steam generation plant such as a nuclear couplant, thermal energy generated in a heat source such as a nuclear reactor is transported to a steam generator (hereinafter abbreviated as SG) using a primary coolant, and within this SG it is transferred to a secondary coolant. Convert water, which is a secondary coolant, into steam by exchanging heat with it, and use this steam as another heating source.

Aluminum is used to obtain electrical energy by rotating a turbine or generator.

In a large-capacity steam generation plant, multiple turbine dynamic water supply units (hereinafter abbreviated as tloFWP) and motor dynamic water supply units (hereinafter abbreviated as tloFWP) are used to ensure the flow rate of secondary coolant.
M/11 (abbreviated as FWP) has been installed. Below, as a typical example, two TO! 1FWP (with the prefix A-B-, respectively, is Te, SotLttL'
kA-? /D FWP, B-t is distinguished like 1 rabbit. ) and one w/n FWI", but the patent is applicable to a plant that has multiple ?/D FWPs and one or more M/DFWPs. Needless to say.

Fi in such a plant, and multiple Teha F during high load operation.
When using wPt, start/stop/low load or? /D FW
P C) When in a bad mood K M/D FwP t-use le (!
When the 11lrh FWP is out of order, the M/DFWP, which is an alternative operating terminal, plays a backup role. The water supplied with a flow rate by these water inlets is led to the SGK and contributes to the control of the SG water level. Therefore, when an abnormal phenomenon occurs in the water level of the operator Fi8G and a warning is issued, it is necessary to find out what the cause of the JJK is and take appropriate operational action.

Figure 3 shows the equipment configuration around the water supply pump, which is one of the applications.

Water supply source not shown, A-T/D FWP 31 and B-? /D The feed water given a flow rate by the FWP 32 is once collected in the feed water goo 33, the flow rate is adjusted by the feed water flow rate control valve 34, and after flowing into the 5G 35 where it is heated and boiled, only the steam content is converted to steam. It flows into Goo 36. In the same 5G35, the water level is measured by the water level gauge 32, and this measurement signal is used as the main feedback signal.
The G water level control system 38 adjusts the opening degree of the water supply flow rate control valve 34 . Although only one SG loop 30 is shown in the figure, which is disconnected from the water supply flow rate control valve, SG, water level gauge, and SG water level control system, multiple other 8G loops 40 are generally installed. , water supply go to water supply 3
After passing through each SG loop 30 and 40, it joins the steam at Goo 36. Goo 33 to water supply, Goo 3 to steam
6, the pressure is measured by the pressure gauges 41 and 42, and the difference is calculated by the subtractor 43 to obtain the actual differential pressure ΔPa.
ct to the set differential pressure ΔPset set by the ΔP program setter 44, the T/DFWP main controller 45 controls the A to D FWP controllers 46 and B.
-T/D A control target value for the FwP controller 41 is generated. A-T/D FWP controller 46 and B-T/
The D FWP controller 47 uses the rotational speed measured by the tachometers 48 and 49 as a feedback signal to control the above-mentioned A-T/D
The rotation speeds of wP s 1 and B-T/D FWP j 2 are controlled respectively. In addition, goo 33 to the water supply
The configuration is such that the flow rate from the M/D FWP 50, which is a redundant system, can also be combined.

Conventionally, rsG water level deviation large", rsG water level high/low", "
When an alarm such as a large deviation between steam flow rate and feed water flow rate occurs, information such as various process quantities and related alarms necessary for searching for the cause and determining operation operations is presented, and operators can use this information to We have been working to eliminate and reduce abnormal events. However, this requires a great deal of time and money to train operators with sufficient knowledge and skills.

[Problem to be solved by the invention]

rs due to failure of turbine dynamic water supply sonde speed control system
"G water level deviation large", rsG water level high/low".

The present invention realizes a technology that automatically makes the following judgments in a computer that are equivalent to those made by a skilled operator when issuing an alarm such as "large steam flow rate - feed water flow rate deviation" and provides operation support information. This task consists of the following elemental tasks.

(1) When issuing an alarm, determine whether it is a temporary transient phenomenon due to plant disturbance, or whether an abnormality has occurred in the SG water level control system or Fi/inde speed control system.

(2) - In the case of a temporal transient phenomenon or an abnormality in the SG water level control system, determine the respective measures.

(3) If there is an abnormality in the speed control system, perform a detailed cause search to the point where manual operation is possible, and determine the appropriate operation.

(4) The results of (1) to (3) above should be communicated to the operator.

Monitor the situation thereafter.

The present invention was made in view of the above points.

The purpose of this invention is to provide an intelligent plant operation support system that reduces the mental burden on operators in the stressful situation of alarm generation and further improves plant safety and operation rate.

[Means to solve the problem]

In other words, the plant operation support device according to the present invention includes the following means.

(1) A first means (abnormal condition monitoring device) for monitoring signs of abnormality in the water supply pump speed control system.

(2) A second means (decision-making device) for searching for the cause of an abnormality and determining an appropriate operation when an abnormality sign is detected.

(3) A third means (memory) for storing knowledge and logic used in the second means.

(4) Fourth means (plant input device) for inputting process quantities and alarm signal values from the plant.

(5) Fifth means (working memory) for storing momentary process quantities, alarm signals, etc.

(6) Sixth means (output device) for outputting diagnostic results and operation guides.

[Effect]

(1) The first means is 8G stored in the fifth means.
Water level, water supply flow rate, steam flow rate, or alarm signals related to these are input, and signs of abnormality in the plant are monitored.

(2) When an abnormality sign is detected by the first means, the second means detects the ΔP program setting value stored in the fifth means, the A-TE/DF'wP rotational speed, and the B-TID.
The FWP rotation speed and the like are input, and the knowledge and logic stored in the third means are used to search for the cause of the abnormality and decide on an appropriate operation, and the results are outputted via the sixth means.

(3) The third means stores knowledge and logic for generating useful information when operators make decisions, such as searching for abnormal causes and determining appropriate operations, which are used in the second means. .

(4) The fourth means inputs process quantities, equipment status signals, and alarm signals required by the first and second means from the plant.

(5) The fifth means stores momentary values of process quantities, equipment status signals, alarm signals, etc. input by the fourth means.

(6) The sixth means provides the operator with information for decision support generated by the second means.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS A plant support device according to an embodiment of the present invention will be described below with reference to the drawings.

(1') Device Configuration The device configuration 911 of the present invention is shown in FIG. Note that the part surrounded by the broken line is the part of the present invention.

Plant information such as process quantities and alarm signals of the plant 100 to be supported is input through the plant input device 4, and its output is recorded in the working memory 5. An abnormality symptom monitoring device J and a decision making device 2 are connected to this working memory 5 so that it can be referenced from both. The output of the abnormality sign monitoring device 1 is connected to the input terminal of a decision making device 2, and a memory 3 is further connected to the decision making device 2. Then, the output of the decision making device 2 is connected to the output device 6.

As a result, the configuration is configured to output (display) the diagnosis results and the support information of the operation guide Misaki. (2) Abnormality sign monitoring device The abnormality sign monitoring device 1 detects an abnormality somewhere within the turbine dynamic feed water pump speed control system. If this occurs, there is a large r8G water level deviation that may be transmitted through the process and control system.”
, rsG water level high/low", "Steam flow rate - feed water flow rate deviation large"
The presence or absence of abnormal symptoms is monitored using alarms such as these as symptom detection input signals. However, it goes without saying that it is equivalent even if the process amount for transmitting these is determined using the SG water level, water supply flow rate, steam flow rate, etc. (3) Decision-making device and decision-making knowledge Decision-making device 2 is , is a program that uses a computer to make a judgment equivalent to the judgment made by a skilled operator when an abnormality sign is detected by the abnormality sign monitoring device 1. for that,
Knowledge logic used by a skilled operator in such a case is stored in the memory 3.

It is available for use as needed. Figure 2 shows the specific knowledge content. However, although logic expression is used here for convenience, each branch judgment element, logical sum element, etc. in the figure may be realized by a so-called rule expression system.

The knowledge content shown in Figure 2 utilizes the following natural laws.

■ The content of thoughts when an abnormality sign is detected differs depending on whether the fluctuation in the SG water level is rising or falling. In the case of upward movement, do not fill the SG with water, t/DFW
The key to driving is to cause the P to overspeed, which can be dangerous. On the other hand, in the case of a downward direction, the focus of operation is to use redundant means such as M/DFWP to prevent water from running out in the SG. Therefore, it is determined from the measured water level value.

(2) Roughly narrowing down whether the cause of the water level fluctuation lies in, for example, an individual SG water level control system within each SG loop, or a part common to all 8G loops, that is, the water supply pump system. Rounding it up, it is determined whether water level fluctuations are occurring in all 8G loops.

When it occurs in an individual loop, K outputs a message to that effect. In other words, since the water supply source is operational,
The operator can take steps to avoid abnormalities by manually adjusting the water supply flow rate control valve.

The following is a judgment made when the cause of the abnormality is in a common part.

■ Check the consistency of the situation.

(+) A decrease in the water supply flow rate when the water level is rising, or an increase in the water supply flow rate when the water level is falling, indicates that the control system is operating normally. However, this is the correct behavior if the plant is not affected by disturbances such as load fluctuations. Therefore, if there is no plant disturbance, it is sufficient to monitor the return to normality, but if there is plant disturbance, it is necessary to wait for stabilization and make a decision again.

(11) This is a case where there is an abnormality in the water supply pump system where the water supply flow rate is increasing when the water level is rising or the water supply flow rate is decreasing when the water level is falling. Explore. However, if there is a plant disturbance, it is necessary to wait for the situation to settle and then make a decision again.

■ Narrow down the cause. Therefore, the flow of fluid and control signals in the process can be defined as (i) A, B -? /D Is the FWP rotation speed normal?i(i+) A, B -? /1) rwp rotation speed tvxyn xstat (f!D A, B -?/
D FWP rotation speed) change situation Ha! (i casting Δpfc
Is the r Durham set value normal? iM What is the control deviation of ΔP? Check whether the pressure of M-water supply and steam is normal or not, and trace the cause.

(,)! /D FWP main controller failure (b) A or B-TE/D FWP controller failure (e) ΔPfc
I-gram setting device failure (d) Identify the failure of the pressure gauge at the feed water or steam line. In addition, since the interlock is activated to cause a trip when the suction pressure drops or the deaerator water level drops, floor trips due to the (・) interlock are also identified only when the SG water level drops. .

■ Decide on treatment.

■ In the case of causes (a) and (b), switch the corresponding controller to manual and perform manual control.

■ In the case of causes (e) and (d), the output signal is being used! /Switch DFWP main controller to manual 1
Manual control.

■ In the case of cause (e), the interlock is considered to be operating normally, so there is no particular action to be taken.

■ Follow up on treatment results.

■ If you try to increase the rotation speed and water supply flow rate using manual control, but it does not work, use the redundant system M/DF.
'Additionally start WP.

■ If you try to reduce the rotation speed and water supply flow rate using manual control, but that does not work, manually adjust the EH governor of the relevant clean drive turbine to return the rotation speed to the normal value.

〔Effect of the invention〕

As described above, according to the present invention, (1) In the tense state of alarm generation, the results are obtained by making judgments equivalent to those made by a skilled operator in a calm state, such as searching for the cause of the alarm and determining driving operations. This has the effect of reducing the mental burden on operators and further improving safety and operating rates.

(2) In addition, by separating the knowledge needed to realize the previous item from the search demigram, we will be able to quickly and accurately perform expansion and maintenance when new knowledge is obtained, ensuring safety and security.
This has the effect of further improving the operating rate.

[Brief explanation of drawings]

Fig. 1 is a block diagram showing the configuration of a plant operation support system according to an embodiment of the present invention, and Fig. 2 shows a logic l! ! FIG. 3 is a block diagram showing the configuration of a conventional water supply pump system. 1... Condition monitoring device, 2... Decision making device, 3...
- Memory, 4... Plant input device, 5... Working memory, 6... Output device, 100 River Plant. Device configuration diagram

Claims (1)

[Scope of Claims] In a plant having at least one or more turbine-driven feedwater pumps, in order to obtain the flow rate of water supply to a steam generator, a plant input means for inputting plant information such as a process amount and an alarm signal from the plant; , a plant information storage means for storing the plant information input by the plant input means; an abnormality sign monitoring means for inputting the plant information stored in the plant information storage means to monitor abnormality signs of the plant; knowledge information storage means storing knowledge information necessary for searching for causes and determining operations; and inputting plant information stored in the plant information storage means when an abnormality sign is detected by the abnormality sign monitoring means; A decision-making means that uses the knowledge information stored in the knowledge information storage means to search for the cause of the abnormality and decide on an appropriate operation, and a decision-making means that uses the knowledge information stored in the knowledge information storage means to search for the cause of the abnormality and determine the appropriate operation, as well as support information such as diagnostic results and operation guides obtained by this decision-making means. A plant operation support device comprising an output means for outputting an output.