An accident planning system for plants.

Abstract

To provide an accident countermeasure planning system for a plant capable of planning accident countermeasures in consideration of the influence of an event with uncertainty occurring outside the plant.SOLUTION: An accident countermeasure planning system includes: accident countermeasure input means 2 for inputting an accident countermeasure outside a plant; cost information deriving means 3 for deriving a plurality of cost information items including route information indicating a travel route in accident countermeasures and travel time information indicating a travel time of the route, the cost information from different combinations of a departure point and an arrival point of a route; external risk deriving means 4 for deriving external risk information due to external events occurring outside the plant for each cost information; exposure risk deriving means 5 for deriving exposure risk information outside the plant for each cost information; and countermeasure selecting means 6 for selecting a countermeasure having the lowest total risk information derived from a plurality of cost information based on external risk and exposure risk information.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to an accident response planning system for a plant that prepares plans for accident responses to be taken in the event of an accident occurring in the plant. [Background technology]

[0002] As an accident response planning system for the above-mentioned plant, for example, in a plant such as a nuclear power plant, a system such as that shown in Patent Document 1 is used which is configured to plan evacuation measures based on the accident situation identified from the plant's operation information when an accident occurs, and when an accident occurs at the plant, personnel within the plant and residents around the plant are evacuated in accordance with the evacuation measures planned by such a system. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2003-215246 Summary of the Invention [Problem to be solved by the invention]

[0004] Incidentally, some accident countermeasures are carried out outside the plant, and such accident countermeasures also carry the risk of being affected by external events that occur outside the plant (for example, weather, natural disasters, etc.).

[0005] In view of the above circumstances, an object of the present invention is to provide an accident countermeasure planning system for a plant that can plan accident countermeasures taking into account the influence of uncertain events that occur outside the plant. [Means for solving the problem]

[0006] The accident response planning system for a plant of the present invention comprises: an accident countermeasure input means for inputting accident countermeasures to be planned that involve movement outside the plant; a cost information deriving means for deriving a plurality of cost information pieces each having a different combination of a departure point and an arrival point, the cost information pieces including route information indicating a route including a departure point and an arrival point in the accident countermeasures input to the accident countermeasures input means and travel time information indicating a travel time along the route; external risk derivation means for deriving external risk information indicating an external risk due to an external event occurring outside the plant for each of the plurality of cost information; a radiation exposure risk deriving means for deriving radiation exposure risk information indicating a radiation exposure risk outside the plant for each of the plurality of cost information; and a countermeasure selection means for selecting, from the plurality of pieces of cost information, the information with the lowest total risk derived based on the external risk information and the radiation exposure risk information.

[0007] According to the accident response planning system for plants configured as described above, the cost information is information indicating the content of accident response measures that involve movement outside the plant, and after deriving not only exposure risk information but also external risk information from this cost information, the cost information with the lowest total risk is selected, making it possible to plan accident response measures that include risks due to the effects of external events that occur outside the plant.

[0008] In the accident response planning system for a plant of the present invention, the external risk derivation means includes snow accumulation information output means for outputting information indicating the amount of snow accumulation, a probability distribution, and a topography of a snow-covered area when information indicating snow accumulation is set as the external event; The radiation exposure risk deriving means may include snow accumulation risk assessment means for changing the radiation exposure risk information based on the snow accumulation information.

[0009] Snow accumulation can sometimes cause a phenomenon in which radiation exposure risk information increases, such as an increase in ground shine. However, with the plant accident response planning system configured as described above, safer accident response measures can be planned by changing radiation exposure risk information based on information about snow accumulation. [Effects of the Invention]

[0010] As described above, the plant accident countermeasure planning system of the present invention can provide the excellent effect of being able to plan accident countermeasures taking into account the influence of uncertain events occurring outside the plant. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 1 is a block diagram of an accident response planning system for a plant according to one embodiment of the present invention. [Figure 2] FIG. 2 is a main flowchart of the accident countermeasure planning system for a plant according to the embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0012] Hereinafter, an accident response planning system for a plant (hereinafter referred to as a planning system) according to one embodiment of the present invention will be described with reference to the accompanying drawings.

[0013] As shown in FIG. 1, the planning system 1 of this embodiment comprises: an accident countermeasure input means 2 for inputting accident countermeasures that are the subject of the plan and that involve travel outside the plant; a cost information derivation means 3 for deriving a plurality of cost information each having a different combination of start point and arrival point, the cost information including route information indicating a route including a start point and an arrival point in the accident countermeasures input to the accident countermeasure input means 2 and travel time information indicating the travel time along the route indicated by the route information; an external risk derivation means 4 for deriving external risk information regarding external risks due to external events occurring outside the plant for each of the plurality of cost information; a radiation exposure risk derivation means 5 for deriving radiation exposure risk information indicating radiation exposure risk outside the plant for each of the plurality of cost information; and a countermeasure selection means 6 for selecting, from the plurality of cost information, the cost information with the lowest total risk information derived based on the external risk information and the radiation exposure risk information.

[0014] The accident countermeasure input means 2 can input, for example, countermeasures such as the establishment of a rear support base, the transportation of supplies, the evacuation of residents and employees, as countermeasures against accidents.

[0015] The cost information derivation means 3 includes departure and arrival point setting means 30 that executes a point setting process to set a departure point and an arrival point; candidate route derivation means 31 that executes a candidate derivation process to derive a plurality of candidate routes (hereinafter referred to as candidate routes) from the departure point to the arrival point; travel time derivation means 32 that executes a travel time derivation process to derive the travel time from the departure point to the arrival point for each of the plurality of candidate routes; shortest route selection means 33 that executes a shortest route selection process to select the candidate route with the shortest travel time as the shortest route from the plurality of candidate routes based on the travel time derived by the travel time derivation means 32; and cost information output means 34 that executes a cost information output process to output cost information relating the shortest route and the travel time.

[0016] In this way, the cost information derivation means 3 is configured to perform the operation of deriving one piece of cost information by sequentially executing the setting process, the candidate route derivation process, the travel time derivation process, the shortest route selection process, and the cost information derivation process.

[0017] The cost information deriving means 3 of this embodiment derives multiple pieces of cost information by repeating the above operation multiple times. At this time, the departure and arrival point setting means 30 sets a combination of departure point and arrival point that is different from the combination of departure point and arrival point of the shortest route in the cost information that has already been derived.

[0018] If the combination of the departure point and the arrival point of the shortest route in the new cost information is different from the combination of the departure point and the arrival point of the shortest route in the previously derived cost information, the departure and arrival point setting means 30 can set the same point as the already set point as either the departure point or the arrival point. For example, when deriving multiple route information for accident countermeasures where the departure point or the arrival point is limited to a plant, it is possible to continue to set the position (point) of the plant as either the departure point or the arrival point.

[0019] The external risk derivation means 4 has an external event setting means 40 that sets external event information, and an external risk assessment means 41 that derives external risk information that indicates the risk due to the event set by the external event setting means 40.

[0020] The external event information includes, for example, information indicating weather (for example, snowfall, rainfall, etc.) and natural disasters (for example, earthquakes, tsunamis, tornadoes, typhoons, etc.).

[0021] The external risk assessment means 41 executes a process of deriving information on risks (traffic risks) caused by events indicated by external events as external risk information.

[0022] In addition, the external risk assessment means 41 is configured to execute a process to output snowfall information indicating the amount of snowfall, probability distribution, and topography of the snow-covered area when information indicating snowfall is set in the external event information.

[0023] The exposure risk derivation means 5 includes a release condition derivation means 50 that derives release information including the probability that radioactive material will be released from the plant and the amount of radioactive material released, a diffusion evaluation means 51 that derives diffusion information regarding the diffusion of radioactive material released from the plant, an exposure dose evaluation means 52 that derives dose information indicating the amount of radioactive material released from the plant, and an exposure risk evaluation means 53 that derives exposure risk information based on the release information, diffusion information, dose information, and cost information.

[0024] The release condition deriving means 50 may be configured to derive release information based on, for example, plant information indicating the state of the plant and scenario information relating to accidents that may occur in the plant.

[0025] The radiation exposure risk derivation means 5 is configured to execute a risk update process that changes the radiation exposure risk information based on the snow accumulation information when information indicating snow accumulation is set in the external event information by the external event setting means 40 (when information indicating snow accumulation is set in the external event information). Because snow accumulation causes events that increase radiation exposure risk information, such as an increase in ground shine, the risk update process should increase the radiation exposure risk information based on the snow accumulation information.

[0026] As described above, the countermeasure selection means 6 selects the cost information with the lowest total risk information from among multiple pieces of cost information. The countermeasure selection means 6 is also configured to output the accident countermeasures input by the accident countermeasure input means 2, as well as the cost information selected for the external risk information, exposure risk information, and total risk information, in association with each other. As a result, a travel route that is safe and suitable for responding to an accident is set for the accident countermeasures.

[0027] In addition, when the same accident countermeasure is planned again by the planning system 1, the countermeasure selection means 6 is configured to overwrite the newly derived accident countermeasure information on the previously generated accident countermeasure information, and the planning system 1 repeatedly executes a series of operations so that the accident countermeasure information is continuously updated to the latest information.

[0028] The configuration of the planning system 1 according to this embodiment is as described above. Next, the operation of the planning system 1 will be described.

[0029] The planning system 1 is configured to sequentially specify the accident countermeasures to be planned using the accident countermeasure input means 2, evaluate the risks using the cost information derivation means 3 and the external risk derivation means 4, and select safe and appropriate countermeasure content (in this embodiment, travel routes for accident countermeasures) using the countermeasure selection means 6.

[0030] More specifically, in the planning system 1, as shown in FIG. 2, the accident countermeasures to be planned are input by the accident countermeasure input means 2 (S1), and the cost information derivation means 3 derives multiple cost information for the accident countermeasures (S2).

[0031] Next, the external risk deriving means 4 derives external risk information (S3). At this time, if the external event information includes information indicating snowfall (Yes in S4), the external risk assessment means 41 derives snowfall information (S5).

[0032] Then, the radiation exposure risk deriving means 5 derives radiation exposure risk information (S6). At this time, if the external event information includes information indicating snowfall (Yes in S7), the radiation exposure risk deriving means 5 executes a risk update process to update the radiation exposure risk information (S8).

[0033] Next, the countermeasure selection means 6 selects the cost information with the lowest total risk information from the plurality of cost information (S9).

[0034] If the plan for the accident countermeasures is to be continued (Yes in S10), the accident countermeasures to be planned are input again by the accident countermeasure input means 2 (S1).

[0035] As described above, according to the planning system 1 of this embodiment, it is possible to derive multiple candidate routes for travel as a plan for accident countermeasures involving travel outside the plant, select one candidate route from these candidate routes, derive multiple pieces of cost information, and select the one with the lowest risk from this multiple pieces of cost information.

[0036] Then, after deriving not only exposure risk information but also external risk information from cost information, which indicates the content of accident countermeasures involving movement outside the plant, the cost information with the lowest total risk information is selected, making it possible to plan accident countermeasures that include risks due to the impact of external events occurring outside the plant.

[0037] Therefore, the planning system can provide the excellent effect of being able to plan accident countermeasures taking into account the influence of uncertain events occurring outside the plant.

[0038] Furthermore, if the planning system is executed repeatedly, the existing accident countermeasure information is overwritten (updated) with the newly output accident countermeasure information from the countermeasure selection means 6, so that the contents of the accident countermeasures can be kept up to date, and when an accident countermeasure is required, this latest accident countermeasure can be presented.

[0039] Furthermore, when snowfall occurs, it can cause phenomena that increase radiation exposure risk information, such as an increase in ground shine, but by changing the radiation exposure risk information based on information about snowfall, it is possible to plan safer accident countermeasures.

[0040] The plant accident response planning system according to the present invention is not limited to the above-described embodiment, and it goes without saying that various modifications can be made within the scope of the gist of the present invention.

[0041] Although not specifically mentioned in the above embodiment, for example, the process of deriving external risk information by the external risk derivation means 4 and the process of deriving exposure risk information by the external risk derivation means 4 may be performed by a probabilistic risk assessment method (so-called PRA).

[0042] Although not specifically mentioned in the above embodiment, the external event information may include, for example, information indicating the collapse of a structure (a building or transportation facility such as a road or bridge). In this case, the external risk assessment means 41 may be configured to derive external risk information based on the external event information indicating the collapse of a structure.

[0043] In the planning system 1 of the above embodiment, the external risk assessment means 41 was configured to output snow accumulation information indicating the snow accumulation situation if the external event information included information indicating snow accumulation. However, for example, in addition to the process of outputting snow accumulation information, the external risk assessment means 41 may be configured to output information indicating the situation of other weather such as rain if the external event information includes information indicating this weather, or to output information indicating the situation of a natural disaster if the external event information includes information indicating a natural disaster.

[0044] Furthermore, the radiation exposure risk deriving means 5 is configured to execute a risk update process for updating radiation exposure risk information based on snowfall information if the external event information includes information indicating snowfall. However, for example, even if information indicating other weather or information indicating a natural disaster is included, It may be configured to perform a risk update process. [Explanation of symbols]

[0045] 1...Planning system, 2...Accident countermeasure input means, 3...Cost information deriving means, 4...External risk deriving means, 5...Risk deriving means, 6...Countermeasure selection means, 30...Departure and arrival point setting means, 31...Candidate route deriving means, 32...Travel time deriving means, 33...Shortest route selection means, 34...Cost information output means, 40...External event setting means, 41...External risk assessment means, 50...Release condition deriving means, 51...Diffusion assessment means, 52...Dose assessment means, 53...Risk assessment means

Claims

1. an accident countermeasure input means for inputting existing accident countermeasures to be planned, which involve movement outside the plant; a cost information deriving means for deriving a plurality of cost information pieces each having a different combination of departure point and arrival point, the cost information pieces including route information indicating a route including a departure point and an arrival point in the existing accident countermeasures input to the accident countermeasure input means and travel time information indicating a travel time for the route; external risk derivation means for deriving external risk information indicating an external risk due to an external event occurring outside the plant for each of the plurality of cost information; a radiation exposure risk deriving means for deriving radiation exposure risk information indicating a radiation exposure risk outside the plant for each of the plurality of cost information; a countermeasure selection means for selecting a new accident countermeasure related to cost information having the lowest total risk information derived based on the external risk information and the radiation exposure risk information from among the plurality of cost information, and overwriting the existing accident countermeasure with the new accident countermeasure; Accident planning system for plants.

2. the external risk derivation means includes snow accumulation information output means for outputting snow accumulation information indicating the amount of snow accumulation, probability distribution, and topography of a snow-covered area when information indicating snow accumulation is set as the external event; the radiation exposure risk deriving means includes snow accumulation risk assessment means for changing the radiation exposure risk information based on the snow accumulation information; 2. The accident response planning system for a plant according to claim 1.

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