Plant countermeasure evaluation system

Abstract

To provide a system 1 for evaluating measures for a plant, capable of evaluating whether accident measures are effective for an accident which occurred in the presence of an external factor.SOLUTION: A system includes: external risk derivation means 3 which derives risk information on an accident in a plant where measures are taken, on the basis of plant information indicating a current situation of the plant, external factor information indicating an external factor that may cause the accident in the plant, and accident measure information indicating the measures against the accident which occurred in the plant; normal condition risk derivation means 2 which derives risk information on the accident in the plant in the absence of accident which is caused by the cause of the accident indicated by the external factor, on the basis of the plant information and the accident measure information; and change derivation means 4 which derives risk change information indicating a change of risk during the measures taken depending on the presence or absence of external factor, by comparing the risk information derived in the normal condition risk derivation means 2 with the risk information derived in comparison risk means.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention is a countermeasure evaluation system for a plant that evaluates risks in accidents caused by external factors outside the plant.

Background Art

[0002] Conventionally, plants such as nuclear power plants have introduced risk monitors to monitor the current risks of the plants. For example, in a process management system that supports schedule management of plant maintenance work, such as that disclosed in Patent Document 1, a risk monitor is introduced to more safely perform maintenance work including repairs and inspections executed during regular inspections of the plant. This is known.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, conventional risk monitors are generally configured to monitor changes in risks when the equipment configuration within the plant changes, and the information displayed by the risk monitor does not include information on events (external factors) that occur outside the plant. Therefore, the effectiveness of accident countermeasures may not be accurately evaluated.

[0005] Therefore, in view of such circumstances, an object of the present invention is to provide a countermeasure evaluation system for a plant that can evaluate accident countermeasures in consideration of external factors that occur outside the plant.

Means for Solving the Problems

[0006] The countermeasure evaluation system for a plant of the present invention is An external risk derivation means for deriving accident risk information for the plant after implementing countermeasures, based on plant information indicating the current status of the plant, external factor information indicating external factors that cause accidents at the plant, and accident countermeasure information indicating countermeasures taken for accidents that have occurred at the plant. A normal risk deriving means for deriving risk information for an accident that occurred at a plant under conditions where the external factors are present, based on the plant information and the accident countermeasures information, The system includes a change derivation means that derives risk change information indicating the change in risk when countermeasures are implemented due to the presence or absence of the external factors, by comparing the risk information derived by the normal risk derivation means with the risk information derived by the comparison risk means.

[0007] According to the plant countermeasure evaluation system with the above configuration, the change derivation means compares the risk information derived by the external risk derivation means with the risk information derived by the normal risk derivation means. By comparing the risk of implementing countermeasures for an accident that occurred in a normal plant with the risk of implementing countermeasures for an accident that occurred in a plant where external factors causing the accident are present, it is possible to evaluate whether the countermeasures for the accident are contributing to the containment of the accident that occurred under conditions where external factors are present.

[0008] Furthermore, in the plant countermeasure evaluation system of the present invention, The system includes an update means for updating at least one of the plant information and the external factor information, The external risk deriving means derives the risk information by replacing at least one of the plant information and external factor information updated by the updating means with at least one of the existing plant information and external factor information. The normal risk deriving means is configured to derive the risk information by replacing at least one of the plant information and the external factor information updated by the update means with at least one of the existing plant information and the external factor information.

[0009] With this configuration, in accordance with changes in the plant's condition and the external conditions of the plant, It is possible to re-evaluate the countermeasures indicated by accident response information.

[0010] Furthermore, the plant countermeasure evaluation system of the present invention is The system includes an alarm means that outputs an alarm corresponding to the magnitude of the risk when the risk change information derived by the change derivation means indicates that the risk of an accident is greater in the risk information derived by the external risk derivation means than in the risk information derived by the normal risk derivation means.

[0011] With this configuration, it is possible to convey that the countermeasures indicated by the accident response information may increase the risk of accidents occurring at the plant if external factors are present. [Effects of the Invention]

[0012] As described above, the plant countermeasure evaluation method of the present invention has the excellent effect of being able to evaluate whether accident countermeasures are effective against accidents that occur under conditions in which external factors are present. [Brief explanation of the drawing]

[0013] [Figure 1] Figure 1 is a functional block diagram of a plant countermeasure evaluation system according to one embodiment of the present invention. [Figure 2] Figure 2 is the main flowchart of the plant countermeasure evaluation system according to the same embodiment. [Figure 3] In Figure 3, (a) is a flowchart of the process for deriving normal risk information, and (b) is a flowchart of the process for deriving external risk information. [Modes for carrying out the invention]

[0014] Hereinafter, a countermeasure evaluation system for a plant according to an embodiment of the present invention (hereinafter, related to the countermeasure evaluation system) will be described with reference to the accompanying drawings.

[0015] As shown in FIG. 1, the countermeasure evaluation system 1 includes a normal risk derivation means 2 for deriving risk information indicating the risk when an accident occurs in a normal plant (hereinafter referred to as normal risk information), and an event outside the plant that affects an accident (for example, typhoon, volcano, tornado, heavy snow, earthquake, tsunami, abnormal occurrence of marine organisms, etc.). An external risk derivation means 3 for deriving risk information indicating the risk when an accident occurs in the plant under the situation where it occurs, a change derivation means 4 for deriving risk change information which is a comparison result of the normal risk information derived by the normal risk derivation means 2 and the external risk information derived by the external risk derivation means 3, an alarm means 5 for issuing an alarm according to the comparison result of the change derivation means 4, and an update means 6 for updating plant information and external factor information.

[0016] Note that the information used in the countermeasure evaluation system 1 according to the present embodiment includes plant information indicating the current situation of the plant, external factor information indicating an event occurring outside the plant (referred to as an external factor), and accident countermeasure information indicating countermeasures against an accident that has occurred in the plant.

[0017] The accident countermeasure information includes convergence target information indicating an accident to be converged, and a plurality of countermeasure information indicating countermeasures to be executed for the convergence of the accident, and the plurality of countermeasure information are associated in a state arranged in chronological order.

[0018] The countermeasure information may include, for example, equipment information indicating the equipment to be operated and operation information indicating the operation method of the equipment indicated by the operation target information.

[0019] Here, the normal risk derivation means 2 and the external risk derivation means 3 are configured to call an accident-specific risk derivation means constructed for each type of accident to evaluate the risk of the accident.

[0020] The risk derivation means for each accident can receive plant information, external factor information, and accident countermeasure information. When plant information and accident countermeasure information are input, it is configured to derive information on risks corresponding to normal state risk information. When plant information, external factor information, and accident countermeasure information are input, it is configured to derive information on risks corresponding to external risk information.

[0021] Note that the risk derivation means for each accident may be configured to derive information on risks corresponding to normal state risk information even when information indicating that no external factor has occurred is input in addition to plant information and accident countermeasure information.

[0022] The risk derivation means for each accident is configured to evaluate the risk of an accident by probabilistic risk assessment (so-called, PRA). Further, the countermeasure evaluation system 1 according to the present embodiment includes a storage means M that stores a plurality of such risk derivation means for each accident.

[0023] The normal state risk derivation means 2 is a means for evaluating the risk of an accident that occurred in a plant where no external factor has occurred. Further, the external risk derivation means 3 is a means for evaluating the risk of the same accident as the accident evaluated by the normal state risk derivation means 2 assuming a plant in a situation where an external factor has occurred. Therefore, by comparing the normal state risk information and the external risk information by the change derivation means 4, it becomes possible to grasp the influence that the plant after executing the accident countermeasure receives from the external factor.

[0024] The normal state risk derivation means 2 can receive plant information and accident countermeasure information, and is configured to derive normal state risk information when the plant information and accident countermeasure information are input.

[0025] The normal risk derivation means 2 according to this embodiment is configured to, when plant information and accident countermeasure information are input, call up an accident-specific risk derivation means of the same type as the accident indicated by the convergence target information of the accident countermeasure information from the storage means M, and input the plant information and accident countermeasure information to the accident-specific risk derivation means called up from the storage means M to derive normal risk information.

[0026] External risk deriving means 3 is capable of receiving plant information, external factor information, and accident countermeasure information, and is configured to derive external risk information when the plant information, external factor information, and accident countermeasure information are input.

[0027] The external risk derivation means 3 according to this embodiment is configured to retrieve an accident-specific risk derivation means of the same type as the accident indicated by the convergence target information of the accident countermeasures information from the storage means M when plant information, external factor information, and accident countermeasures information are input, and to input plant information, external factor information, and accident countermeasures information to the accident-specific risk derivation means retrieved from the storage means M to derive external risk information.

[0028] The change derivation means 4 derives the comparison result between normal risk information and external risk information. The comparison result refers to risk change information that shows the change in risk when countermeasures are implemented due to the presence or absence of external factors. Furthermore, the change derivation means 4 in this embodiment is configured to derive the magnitude of the risk indicated by the external risk information in relation to the normal risk information.

[0029] The alarm means 5 is configured to output different types of alarms depending on the magnitude of the risk change indicated by the risk change information. For example, the alarm means 5 may be configured to have multiple thresholds set to represent the magnitude of the risk change (i.e., the degree of risk increase indicated by the external risk information relative to the normal risk information) in stages, and to output different alarms depending on the comparison result between each threshold and the risk change information.

[0030] The update means 7 is configured to acquire plant information from the plant at all times or at predetermined time intervals, and if the plant information has changed from the previously acquired plant information, it outputs the plant information to the normal risk derivation means 2 and the external risk derivation means 3.

[0031] Furthermore, the update means 7 is configured to acquire external factor information continuously or at predetermined time intervals, and to output the external factor information to the external risk derivation means 3 if it has changed from the previously acquired external factor information. The update means 7 may be configured to acquire external factor information from equipment such as radar that detects changes in weather, or from the internet, for example. It is also possible to manually input plant information and external factor information into the update means 7.

[0032] Furthermore, the update means 7 can also input accident countermeasure information to be evaluated, and is configured to output the input accident countermeasure information to the normal risk derivation means 2 and the external risk derivation means 3.

[0033] Thus, the update means 7 also serves as an input means for inputting plant information and accident countermeasure information into the normal risk derivation means 2, and for inputting plant information, external factor information, and accident countermeasure information into the external risk derivation means 3.

[0034] The configuration of the countermeasure evaluation system 1 according to this embodiment is as described above. Next, the operation of the countermeasure evaluation system 1 will be explained with reference to the attached drawings.

[0035] As shown in Figure 2, the evaluation system performs the following processes: derivation of normal risk information through normal risk assessment (S1), derivation of external risk information through external risk assessment (S2), comparison of normal risk information and external risk information (S3), and output of alarms according to the comparison results of normal risk information and external risk information (S4).

[0036] In the process of deriving normal risk information, as shown in Figure 3(a), the normal risk deriving means 2 retrieves from the storage means M an accident-specific risk deriving means of the same type as the accident indicated by the convergence target information of the input accident countermeasures information (S6), and derives normal risk information by inputting plant information and accident countermeasures information to the accident-specific risk deriving means retrieved from the storage means M (S7).

[0037] Next, in the process of deriving external risk information, as shown in Figure 3(b), the external risk deriving means 3 is configured to call an accident-specific risk deriving means of the same type as the accident indicated by the convergence target information of the input accident countermeasures information from the storage means M (S8), and to input plant information, external factor information, and accident countermeasures information to the accident-specific risk deriving means called from the storage means M and derive external risk information (S9).

[0038] Then, as shown in Figure 2, the normal risk information and the external risk information are compared by the change derivation means 4 (S3), and the alarm means 5 outputs an alarm according to the comparison result of the change derivation means 4 (S4).

[0039] Furthermore, if at least one of the normal risk information or the external risk information has been updated (Yes in S5), the above processes (S1 to S4) are repeated. If the normal risk information and the external risk information have not been updated (No in S5) and the process is terminated (Yes in S6), the system is shut down.

[0040] As described above, according to the countermeasure evaluation system 1 of this embodiment, the change derivation means 4 compares the risk information derived by the external risk derivation means 3 with the risk information derived by the normal risk derivation means 2. By comparing the risk of implementing countermeasures for an accident that occurred in a normal plant with the risk of implementing countermeasures for an accident that occurred in a plant under conditions where external factors that cause the accident (causes directly related to the accident or causes indirectly related to the accident) are present, it is possible to evaluate whether the countermeasures for the accident are contributing to the containment of the accident that occurred under conditions where external factors are present. Therefore, it is possible to evaluate whether the countermeasures for the accident are effective against an accident that occurred under conditions where external factors are present, which is an excellent effect.

[0041] Furthermore, the update means 7 is configured to output the updated plant information to the normal risk derivation means 2 and the external risk derivation means 3 if the updated plant information has changed from the previous plant information (existing plant information) when the plant information is updated, and to output the updated external factor information to the external risk derivation means 3 if the updated external factor information has changed from the previous external factor information (existing external factor information) when the external factor information is updated. Therefore, it is possible to constantly update the assessment of accident risks in accordance with the plant and the external conditions of the plant.

[0042] Furthermore, since the alarm means 5 is configured to output an alarm corresponding to the magnitude of the risk when the risk information indicates that the risk of an accident is greater, it can communicate that the countermeasures indicated by the accident countermeasure information may increase the risk of an accident occurring at the plant if external factors are present.

[0043] It should be noted that the plant countermeasure evaluation system 1 of the present invention is not limited to the above embodiments, and various modifications can be made without departing from the spirit of the present invention.

[0044] Although not specifically mentioned in the above embodiment, the countermeasure evaluation system 1 may also include equipment identification means for identifying equipment within the plant that is highly associated with an accident, based on derivation process information showing the process of deriving external risk information by the external risk derivation means 3 (accident-specific risk derivation means). When the accident-specific risk derivation means evaluates the risk of an accident using PRA, the equipment identification means may be configured to extract, for example, the operation of equipment that increases the risk of an accident based on a scenario that has been evaluated as likely to occur.

[0045] Although not specifically mentioned in the above embodiment, the embodiment may include a search means for deriving risk change information individually for each of the multiple accident countermeasure information pieces and selecting the accident countermeasure information with the smallest risk indicated by the risk change information as the optimal solution. [Explanation of Symbols]

[0046] 1...Countermeasure evaluation system, 2...Normal risk deriving means, 3...External risk deriving means, 4...Change deriving means, 5...Alarm means, 6...Update means

Claims

1. An external risk derivation means derives risk information for accidents at the plant if the countermeasures are implemented in response to an accident caused by the external factors, based on plant information indicating the current status of the plant, external factor information indicating external factors occurring outside the plant, and accident countermeasure information indicating countermeasures for accidents that have occurred at the plant. A normal risk derivation means that derives risk information for an accident at the plant when the same countermeasures as those used for external risk derivation are implemented for an accident that occurred at the plant under normal conditions where the external factors are not present, based on the plant information and the accident countermeasure information. The system includes a change derivation means that derives risk change information showing the change in risk when the same countermeasure is implemented with or without the external factors, by comparing the risk information derived by the normal risk derivation means with the risk information derived by the external risk derivation means. A system for evaluating countermeasures for plant applications.

2. The system includes an update means for updating at least one of the plant information and the external factor information, The external risk deriving means derives the risk information by replacing at least one of the plant information and external factor information updated by the updating means with at least one of the existing plant information and external factor information. The normal risk deriving means is configured to derive the risk information by replacing at least one of the plant information and the external factor information updated by the update means with at least one of the existing plant information and the external factor information. The plant countermeasure evaluation system according to claim 1.

3. The system includes an alarm means that outputs an alarm corresponding to the magnitude of the risk when the risk change information derived by the change derivation means indicates that the risk of an accident is greater in the risk information derived by the external risk derivation means than in the risk information derived by the normal risk derivation means. A plant countermeasure evaluation system according to claim 1 or claim 2.

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