JPH06117885A - Communication support system - Google Patents

Abstract

PURPOSE:To decide an appropriate solution when abnormality occurs in a nuclear plant which is a gigantic system by effectively exchanging the intellectual knowledge of each engineer among the engineers. CONSTITUTION:When the supplying flow rate of water becomes abnormal, a function analyzing system take a countermeasure against the abnormality, but, when the identification of the fault is impossible, the title system 30 is actuated. Then a data base 32 for a communication member list establishes 31 and 33 an initial community with already set members in accordance with the abnormal plant event. The members are connected to each other through a distributed network and information exchange is performed among the members in accordance with a hyper-text by means of an information exchange monitoring function 34 and the final decision is made 35. The final decision is displayed together with the degree of confidence of the members. When the degree of confidence is smaller than a set value, another community larger than the initial community is established by calling a specialist group and the members are asked to discuss until the degree of confidence of the members becomes larger than the set value. The decided cause, countermeasure, etc., of the event are immediately transmitted to operators so as to cope with the plant abnormality.

Description

Detailed Description of the Invention

[0001]

[Object of the Invention]

[0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication support system for assisting an abnormality of a huge system which requires difficult judgment.

[0003]

2. Description of the Related Art It is important for an operator to predict an accident in a large-scale system such as a nuclear reactor plant, and to make an appropriate judgment when a failure occurs. It is determined whether the operation is continued or stopped according to the operation manual. However, in reality, not only when an abnormality appears clearly in a signal, but also when it is not possible to easily determine whether or not a certain degree of deviation is regarded as an abnormality. In such a case, the operator will receive the support based on the technical information of the engineer of the electric power company. Alternatively, the actual countermeasure is determined by the judgment based on the technical information of the engineer on the producer side.

A group of engineers who support such driving is a kind of network in which knowledge is combined by a remote communication means such as a telephone and a facsimile and a conference, and the engineers in the network are members constituting the network. Can be considered as a node with knowledge of.

The problem here is as a coordinator of the problem-solving person in charge of solving the problem, (1) the ability to select an engineer whose information is to be collected, or the structure, that is, the network structure. How to
(2) It depends heavily on the person's own ability to organize personal information.

Conventionally, a problem-solving network configuration that is normally used is called a star type, and is a configuration in which information is collected in a hierarchical form (pyramid type).

A typical example of such a problem that may occur in the present situation is a space shuttle accident. In this accident that occurred in January 1986, "Before the Challenger was launched by a Rockwell engineer who built the space shuttle hull in the air, a large amount of water adhered to the hull and the launch was extremely dangerous. It was discovered from an internal recording tape inside the company, but the warning was not communicated to the officer responsible for launching the NASA shuttle shuttle. "

Taking the example of the case of nuclear power, FIG. 8 shows the maximum and minimum values and phase of pump vibration when the operation is continued in a pressurized water reactor with the main shaft of the primary cooling system pump cracked. It is the observation history of the relationship. As shown in FIG. 8, as of March 2, an increase in the vibration width had started to be observed, and after that, the operation was stopped for more than 20 days and then stopped, and as a result of the inspection, it was found that the spindle had cracks. This level of cracking does not immediately lead to pump damage, but as an operator, if the expert's opinions can be heard without any mental burden as of March 2, a smooth response will always be possible. It seems that there is a need for a system that can easily obtain home knowledge.

FIG. 9 is a relationship diagram in which a causal relationship is estimated when the cause is estimated when the neutron flux suddenly changes.
Possible causes include neutron measuring instrument itself (LPRM), power supply system, equipment vibration phenomenon, dynamic behavior of water / steam two-phase flow, change in nuclear characteristics, etc. From this figure, it can be seen that experts in various fields such as measuring instruments, electricity, instrumentation system, vibration, two-phase flow experiment / analysis, and reactor physics are involved in estimating the cause of this one abnormal event.

As described above, in a huge system having multi-faceted knowledge for one problem analysis, it is assumed that the operator crew alone cannot appropriately deal with an event that has not been experienced in the past. In such cases, appropriate assistance through the communication of experts from various fields is required.

[0011]

Summarizing the above, it can be understood that the following problems exist in the communication network for solving the current problems.

(1) Prior restriction of context (context or knowledge of contents of information exchange); normal contactability, that is, information exchange between remote parties on a telephone (hereinafter referred to as wide area) Although it is possible, it is premised that the context for dialogue has already been shared among the interlocutors, and is limited to the exchange of information within the intellectual range, which is premised from the beginning.

(2) Lack of openness; limited information exchange between two interlocutors or nodes.

(3) Lack of storage of information: Telephone cannot store, retrieve, or reproduce information, and the communication is transient or completely dependent on the information processing ability of the interlocutor (hereinafter, storage). Called sex). A facsimile can be stored as a document, but in its original form it still depends greatly on the information organization ability of the person who owns it.

(4) Excessive mental burden on the information provider;
As can be considered with the space shuttle mentioned above,
Since informants provide information that can lead to big decisions, they are likely to get caught up in unexpected controversies.
On the contrary, this is a huge psychological burden for the information providers to be discussed and worried only in a single group or in a limited group, and to make a decision on whether or not to inform the final decision maker. Therefore, it is conceivable that the necessary information will not appear at the appropriate time, and eventually an accident will occur.

(5) Problem of star-type network: The star-type network is characterized in that a predetermined information network can collect information in a short time. However, when faced with a difficult problem, it is difficult to extract the deeply meaningful information that the members have, and the satisfaction of the members is low, so it is difficult to always voluntarily provide useful information. Is.

Therefore, the present invention solves the above problems and effectively exchanges intellectual information possessed by engineers when an abnormality occurs in a nuclear power plant, which is a huge system. The purpose is to provide a system that supports communication to formulate an appropriate solution.

[0018]

[Constitution of the invention]

[0019]

DISCLOSURE OF THE INVENTION The present invention addresses the problem posed by an operator using a distributed network system for the abnormality of a huge system which requires a difficult judgment. It is a system that supports providing appropriate countermeasures for problem solving by providing means.

That is, according to the present invention, (1) In order to facilitate communication, a plaza of a group of related engineers is set up in order to support an operator in response to an abnormality in a huge system that requires difficult judgment. It is a communication support system that has a function of transmitting information over a wide open space, making judgments for effective decision making, and having the function of automatically accumulating these experiences as a database.

(2) In the communication support system of the above (1), a communication support system having a function of automatically selecting an engineer group who should initially participate in communication based on observed abnormal phenomena and mechanical analysis of the system. Is.

(3) In the communication support system of (1), the communication support system has a distributed hypertext network as information transmission means.

(4) In the communication support system of the above (1), when the group structure strength satisfies a certain value as the decision-making time, but the degree of agreement of the communication participants satisfies a certain threshold. It is a communication support system that is subject to.

(5) In the communication support system of (4) above, when the group structure strength satisfies a certain value but does not satisfy a certain threshold of the degree of agreement of the communication participants, the communication analysis technique is performed by the function analysis system. It is a communication support system that has the function of expanding the number of people.

(6) In the communication support system of the above (1), when the decision criteria of the decision making time are satisfied, but there is a disagreement among the engineers participating in the communication, the expertise of each engineer and the past communication are determined. It is a communication support system that makes a decision based on the weight based on the degree of contribution of each and displays both the result of each engineer and the decision result.

(7) The communication support system of the above (1) is a communication support system in which the system function analysis function can be expanded based on the observed abnormal phenomenon and the abnormal phenomenon which have become apparent after the system investigation.

(8) In the communication support system of the above (1), a communication support system for recording the degree of contribution of the engineer to the communication based on the cause of the abnormality revealed after the system investigation and the cause expected by the engineer. is there.

In other words, (1) based on the detected abnormal signal, a functional failure analysis database is used to select a group of equipment with a possibility of failure, and a group of related engineers is determined for each equipment. Set up a communication square that should be involved in decision making.

(2) When selecting a plaza, if the past communication is taken and it is confirmed that the communication has made an appropriate judgment by the confirmation inspection after the conversation, the combination is stored in the communication database. By setting the communication network for events that may occur in the future,
Create a database with a learning function that allows appropriate combinations.

(3) Hypertext and
The system will ensure a wide area using level e-mail and exchange information other than text information so that the system can be easily understood.

(4) The strength of communication performed by e-mail is measured by the method of measuring group structure strength based on graph theory, the importance of the problem is estimated, the required bond strength is determined, and the bond strength is calculated. Ask if the members in the set plaza have exchanged information, and if there is a shortage, encourage further interaction.

(5) The transmitted information is syntactically analyzed, and the device assumed to be out of order, its cause, and the certainty factor are extracted from the information.

(6) A list in which the devices, causes, and certainty factors extracted by information exchange are arranged in order of certainty factors is created and used as a decision-making material for formulating countermeasures.

In the communication support system of the present invention, when a huge plant falls into some abnormal state by the above-mentioned means, various data relating to the plant are sent not only to the operator but also to an external support unit. However, it is characterized by transmitting data and making appropriate decisions and supporting operators by an effective communication system that possesses openness within the external support unit, which is a group of experts.

[0035]

[Action]

(1) Setting of communication plaza In the field of maintenance, functional failure analysis (FFA) and failure mode impact assessment (FMEA) are compiled into a database and maintained.
Although maintenance methods are used, these are limited to information indicating functions, devices, and parts that may be related to a failure. The first function of the present invention is that an online computer that uses this relationship and notices a change in the instrument signal,
If an abnormality is automatically judged and the crew member is urged to take countermeasures, if an automatic abnormality diagnosis is not possible, the plaza of the engineer group registered in the database will be set. The square is the function of the plant,
It will consist of a group of equipment and parts related technology, and will be able to gradually expand the circle of communication according to the decision-making situation.

(2) Creation of database Data on functions, devices, and parts related to instrument signals are stored in advance in a computer by functional failure analysis and failure mode influence evaluation of a plant, and a group of engineers related to them is stored. Create a network. The weight of each member according to the event is also recorded according to the past communication experience and the appropriateness of judgment, and it can be updated every time the problem is solved. In addition, the functional failure analysis and failure mode impact evaluation described above will be automatically changed as appropriate.

Other databases also include design data, maintenance history data, and failure case data.

(3) Presentation environment A hypertext level e-mail is used as a communication means. This system enables two-way information exchange for each participant, and also provides an efficient presentation environment that includes not only character-level information exchange but also images and audio. Can grasp and assert opinions efficiently. In addition, generally speaking, people tend to give out frank opinions when using documents or the like rather than talking face-to-face, which has the advantage that information can be exchanged with deep meaning. An example of hypertext is shown in FIG.

FIG. 3 shows the network configuration of the electronic mail taken up here. In this network, the key station 1 is mainly arranged. Unlike the distributed network described above, this configuration is a star type on the hardware. However, the person who actually uses
As shown in FIG. 3, it is possible to communicate with any member 5 through the key station 3 and without being aware of the intervention of the key station 3. The role of the key station 3 is to receive a problem first, then set up a plaza corresponding to the problem, store and analyze information to be exchanged, promote information exchange in the plaza, and have confidence in solving the problem. Is to evaluate.

(4) Decision-making method The decision-making of the group is performed by the following procedure. The importance of the problem is estimated based on the communication frequency of the members of the set plaza, the required bond strength is set in advance, and the communication of e-mail is performed by the method of measuring the group structure strength by graph theory. The strength is measured and it is determined whether the members in the plaza have exchanged information up to the set bond strength, and if insufficient, the system encourages further interaction. If the set bond strength is satisfied, the transmitted information is parsed, and the weight of each person, which is set in advance, is presumed as a device assumed to be a failure, its cause, countermeasures and certainty of decision making. The results are communicated to the plant operator to take countermeasures against abnormalities. If the abnormal condition with the plant still continues, set up a wide communication plaza again, exchange similar information, and make a decision.

(5) Update of Database In this way, the certainty factor of the determination of each terminal which is appropriately determined is automatically recorded in the system and updated as a learning function. Further, the newly obtained plant behavior is immediately updated in the functional failure analysis and failure mode influence evaluation database and recorded as new knowledge information. In addition, the failure case data is updated as a new case.

[0042]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of the present invention will be described with reference to the drawings for a nuclear power plant regarding a communication support system of the present invention.

FIG. 4 shows a schematic diagram of a nuclear power plant. Water is injected into the reactor pressure vessel 10 by the water supply system 11, and the cooling water heated by the core inside the nuclear pressure vessel 10 becomes steam, which rotates the turbine 12 and is condensed by the condenser 13. It The condensed cooling water is heated by the feed water heater 14 and is again poured into the reactor pressure vessel 10 by the feed water system 11.

FIG. 5 shows the flow of decision making in the communication support system of this embodiment.
In the system described above, if an abnormality is shown in the feed water flow rate as the process data 20 installed in the plant, the disturbance detection system 21 also installed in the plant automatically operates to detect the abnormality. at the same time,
The design data 22, the maintenance history data 23, and the failure case data 24 stored as the database of the present system are called, and the function analysis system 25 formulates the identification of the abnormality, the estimation of the cause, and the abnormality countermeasure. However, if the equipment failure cannot be identified by the functional analysis system 25, the communication support system 30 is automatically activated. The communication system 30 opens an initial plaza by communication members preset by the functional failure analysis database 32 as shown in FIG. 6 according to a plant abnormal event (31, 33). Members are connected in a decentralized network, and information exchange between members by hypertext is performed by an information exchange monitoring function 34 having a graph structure collective structure strength evaluation function until reaching a preset strength of connection, and finally. A decision is made (35).
The decision making thus obtained is displayed together with the certainty factors of all the plazas according to the weighting of the members according to the events stored in advance in the database. If the certainty factor is smaller than the set value, it will be impossible to diagnose the failure by this member alone, and a group of experts registered in the failure mode impact assessment database will be convened to set a larger square than the initial square. , All members will communicate again, and the discussion will be continued until the certainty exceeds a certain set value. In this way, the judgment of the event, cause estimation and countermeasures discussed among the members are immediately transmitted to the operator, and the plant abnormality can be dealt with (3
6). In addition, the decision-making results obtained here are stored in the database as learning effects, new weights are given to the members, and the obtained knowledge is also registered in the failure case data. Update to analysis and failure mode impact assessment database (3
7).

FIG. 7 shows a tree as a member selection standard for setting a plaza for an abnormal water flow rate event. As shown in the second stage of FIG. 7, the abnormal water supply flow rate is classified into a functional failure such as an abnormality in the water supply system, and the abnormal water supply system is classified into the devices constituting them by the failure mode influence evaluation. The above-mentioned initial plaza is made up of members involved in functional failures, such as members who are familiar with abnormalities in the water supply system, and the expanded plaza is made up of members involved in failure mode impact assessment, such as members who are familiar with power sources. It

[0046]

Industrial Applicability The present invention sets a plaza of a group of related technicians in order to support an operator for an abnormality of a huge system which requires a difficult judgment, and a wide area in order to facilitate communication. It has information transmission means, makes decisions for effective decision making, and has the function of automatically accumulating these experiences as a database. External support units have common data, experts can communicate effectively with each other, make more appropriate decisions, and immediately transmit them to the operator crew, which significantly reduces the burden on the operator crew. It is possible to bring the plant to an appropriate state in any situation.

[Brief description of drawings]

FIG. 1 is a diagram showing an example of hypertext used in the present invention,

FIG. 2 is a diagram showing a network configuration of an electronic mail used in the present invention,

FIG. 3 is a diagram showing a network configuration of an electronic mail used in the present invention,

FIG. 4 is a schematic diagram of a nuclear power plant applied in an embodiment of the present invention,

FIG. 5 is a diagram showing a flow of decision making in the embodiment of the present invention;

FIG. 6 is a diagram showing the relationship between the establishment of a plaza, decision making, and the accumulation function in the embodiment of the present invention,

FIG. 7 is a diagram showing a tree which is a member selection criterion for setting a plaza for an abnormal water supply flow rate event;

FIG. 8 is a diagram showing an observation history of phase relations of maximum and minimum values of pump vibration when the main shaft of the primary cooling system pump is continuously operated in a pressurized water reactor in a state where the main shaft is cracked;

FIG. 9 is a relationship diagram in which a causal relationship is estimated when a cause is estimated when a neutron flux suddenly changes.

[Explanation of symbols]

1, 3 ... Key station 5 ... ... Member 10 ... ... Reactor pressure vessel 11 ... ... Water supply system 12 ... ... Turbine 13 ... ... Condenser 14 ... ... Water supply heater 20 ... ... Process data 21 ……… Disturbance detection system 22 ………… Design data 23 ………… Maintenance history data 24 ………… Failure case data 25 ………… Function analysis system 30 ………… Communication support system 31 ………… Communication initial open space setting function 32 ……… Communication member list database 33 ………… Communication by each engineer 34 ………… Information exchange monitoring function 35 ………… Decision making function 36 ………… Decision maker 37 ………… Communication result storage function

Claims (1)

[Claims] 1. A large-scale information transmission means is provided for smoothing communication by setting a plaza for a group of related engineers to support operators in case of a huge system abnormality that requires difficult judgment. A communication support system that has the functions of possessing and making judgments for effective decision making, and further accumulating these experiences as a database automatically.