Radioactive waste discharge planning support system, radioactive waste storage planning support system, and radioactive waste discharge planning method

Abstract

To provide a radioactive waste discharge plan preparation support system capable of efficiently processing and managing radioactive waste.SOLUTION: A radioactive waste discharge planning support system includes a storage unit that stores information on an amount of radioactivity of radioactive waste and a measurement date of the amount of radioactivity, and a discharge planning unit that predicts a time when the amount of radioactivity becomes equal to or less than a specified value based on the information on the amount of radioactivity and the measurement date of the amount of radioactivity stored in the storage unit for the radioactive waste having the amount of radioactivity equal to or more than the specified value, and creates a discharge plan of the radioactive waste based on the predicted time.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a radioactive waste discharge plan creation support system, a radioactive waste storage plan creation support system, and a radioactive waste discharge plan creation method for efficiently treating radioactive waste and reducing the amount of radioactive waste to be managed in decommissioning measures. [Background technology]

[0002] Patent Document 1 discloses a technique for accurately evaluating the radioactivity of waste generated from nuclear power plants. Patent document 1 describes a contamination distribution database (paragraph

[0044] ), and states that "if the contamination distribution data 71 is highly accurate, the accuracy of the conversion coefficient ε determined by the conversion coefficient analysis device 13 can be improved, and the radioactivity of the dismantled object 51 can be evaluated more accurately" (paragraph

[0100] ). Patent Document 1 states that "The demolition plan analysis device 12 is a device that analyzes and determines a demolition plan, such as the demolition method, the size of the items to be dismantled, and the construction procedures, before the demolition of a nuclear power plant" (paragraph

[0022] ), and further states that "The radioactivity evaluation device can accurately evaluate the radioactivity of waste generated from a nuclear power plant by reflecting the actual contamination distribution of the waste" (paragraph

[0015] ). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2023-068364 Summary of the Invention [Problem to be solved by the invention]

[0004] In recent years, the number of nuclear power plants undergoing decommissioning has increased, resulting in an increase in the amount of low-level radioactive waste that needs to be managed. Therefore, it is considered necessary to reduce the amount of low-level radioactive waste that needs to be managed and to efficiently treat the clearance waste that can be reused. However, prior art such as the above-mentioned Patent Document 1 does not disclose a method for reducing the amount of low-level radioactive waste that needs to be managed.

[0005] In order to solve the above-mentioned problems, the present invention aims to provide a radioactive waste discharge plan creation support system, a radioactive waste storage plan creation support system, and a radioactive waste discharge plan creation method that can efficiently process and manage radioactive waste.

[0006] The above and other objects of the present invention and novel features of the present invention will become apparent from the description of this specification and the accompanying drawings. [Means for solving the problem]

[0007] The radioactive waste discharge plan creation support system of the present invention comprises a memory unit that stores information on the amount of radioactivity of radioactive waste and the date on which the amount of radioactivity was measured, and a discharge plan creation unit that, for radioactive waste whose amount of radioactivity is equal to or greater than a specified value, predicts the time when the amount of radioactivity will fall below the specified value based on the information on the amount of radioactivity and the date on which the amount of radioactivity was measured stored in the memory unit, and creates a radioactive waste discharge plan based on the predicted time.

[0008] The radioactive waste storage plan creation support system of the present invention comprises a memory unit that stores information on the amount of radioactivity of radioactive waste and the date on which the amount of radioactivity was measured, and a storage plan creation unit that, for radioactive waste whose amount of radioactivity is equal to or greater than a specific radioactivity level, predicts the time when the amount of radioactivity will fall below the specific radioactivity level based on the information on the amount of radioactivity and the date on which the amount of radioactivity was measured stored in the memory unit, classifies the radioactive waste by radioactivity level based on the predicted results, and creates a plan for storing the radioactive waste based on the predicted time.

[0009] The method for creating a radioactive waste discharge plan of the present invention predicts, for radioactive waste whose amount of radioactivity is equal to or greater than a specified value, the time when the amount of radioactivity will fall below a specified value based on information about the amount of radioactivity and the date the amount of radioactivity was measured, and creates a radioactive waste discharge plan based on the predicted time. [Effects of the Invention]

[0010] According to the radioactive waste discharge plan creation support system and radioactive waste discharge plan creation method of the present invention described above, for radioactive waste whose amount of radioactivity is equal to or greater than a specified value, the time when the amount of radioactivity will fall below the specified value is predicted based on the amount of radioactivity and information on the date the amount of radioactivity was measured, and a radioactive waste discharge plan is created based on the predicted time. This will allow us to know when the amount of radioactivity in radioactive waste will fall below the specified value, making it possible to reuse radioactive waste whose amount of radioactivity has fallen below the specified value earlier, and enabling radioactive waste to be disposed of more efficiently. Therefore, it is possible to reduce the amount of radioactive waste to be managed, increase the amount of reusable radioactive waste, and reduce the cost of managing low-level radioactive waste.

[0011] According to the radioactive waste storage plan creation support system of the present invention described above, for radioactive waste whose amount of radioactivity is equal to or greater than a specific radioactivity level, the storage plan creation unit predicts the time when the amount of radioactivity will fall below the specific radioactivity level based on the information on the amount of radioactivity and the date the amount of radioactivity was measured stored in the memory unit, classifies the radioactive waste by radioactivity level based on the predicted results, and creates a plan for storing the radioactive waste based on the predicted time. This allows radioactive waste to be classified by radioactivity level, so that radioactive waste of each radioactivity level can be managed appropriately, thereby making it possible to reduce the cost of managing radioactive waste.

[0012] Problems, configurations, and effects other than those described above will become clear from the following description of the embodiments. [Brief explanation of the drawings]

[0013] [Figure 1] 1 is a block diagram showing the overall configuration of a radioactive waste discharge plan creation support system according to an embodiment of the present invention. [Figure 2] FIG. 10 is a diagram showing an example of assigning a radioactivity inventory to a 3D model of a plant for which a discharge plan is to be created. [Figure 3] 1A and 1B are diagrams showing examples of waste storage facilities and waste containers to be covered; [Figure 4] FIG. 10 is a diagram illustrating an example of a plant equipment 3D model database. [Figure 5] FIG. 2 is a diagram illustrating an example of the configuration of a waste database. [Figure 6] FIG. 10 is a diagram showing an example of a second configuration of the waste database. [Figure 7] FIG. 10 is a diagram showing an example of a radioactive waste consolidation planning process or a clearance discharge planning process created by the discharge plan creation support system. [Figure 8] 10 is a flowchart of an example of a process for generating a radioactive waste consolidation planning process or a clearance discharge planning process. [Figure 9] FIG. 10 is a diagram illustrating an example of a storage location other than a plant building. [Figure 10] FIG. 10 is a diagram showing an example of process and procedure information for radioactive waste treatment and storage work for each waste treatment company. [Figure 11] 10 is a flowchart of a process for generating process and procedure information for a plurality of radioactive waste treatment and storage operations. [Figure 12] FIG. 10 is a diagram showing an example of a visualized display of the generated radioactive waste consolidation planning process or clearance discharge planning process. [Figure 13] 10 is an example of an input / output interface screen for registering in a database the time when low-level radioactive waste will fall below the clearance level. [Figure 14] 10 is an example of an input / output interface screen for assigning a contractor to handle low-level radioactive waste or clearance waste or to handle storage work. [Figure 15]This is an example of a visualization display screen related to a storage location for low-level radioactive waste. [Figure 16] 10 is an example of a display screen of a graph showing the change over time in the allocation status of contractors involved in the processing or storage of low-level radioactive waste or clearance waste. [Figure 17] FIG. 10 is a diagram showing an example of the configuration of a waste database for making a decision to lower the radioactivity concentration level by one level. DETAILED DESCRIPTION OF THE INVENTION

[0014] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings and the like. The following description shows specific examples of the contents of the present invention, and the present invention is not limited to these descriptions. Various changes and modifications are possible by those skilled in the art within the scope of the technical ideas disclosed in this specification. Furthermore, in all drawings used to explain the present invention, parts having the same function are designated by the same reference numerals, and repeated explanations thereof may be omitted.

[0015] The radioactive waste discharge plan creation support system of the present invention is a radioactive waste discharge plan creation support system that supports the creation of a radioactive waste discharge plan. The radioactive waste discharge plan creation support system of the present invention includes a memory unit that stores information on the amount of radioactivity in the radioactive waste and the date on which the amount of radioactivity was measured, and a discharge plan creation unit that creates a radioactive waste discharge plan. Then, for radioactive waste whose amount of radioactivity is above a specified value, the discharge plan creation unit predicts the time when the amount of radioactivity will fall below a specified value based on the amount of radioactivity and the information on the date the amount of radioactivity was measured stored in the memory unit, and creates a discharge plan for the radioactive waste based on the predicted time.

[0016] The radioactive waste storage plan creation support system of the present invention is a radioactive waste storage plan creation support system that supports radioactive waste storage plans. The radioactive waste storage plan creation support system of the present invention includes a memory unit that stores information on the amount of radioactivity in the radioactive waste and the date on which the amount of radioactivity was measured, and a storage plan creation unit that creates a plan for storing the radioactive waste. Then, for radioactive waste whose amount of radioactivity is above a specific level, the storage plan creation unit predicts the time when the amount of radioactivity will fall below the specific level based on the information on the amount of radioactivity and the date the amount of radioactivity was measured stored in the memory unit, classifies the radioactive waste by radioactivity level based on the predicted results, and creates a plan for storing the radioactive waste based on the predicted time.

[0017] The radioactive waste discharge plan creation support method of the present invention is a radioactive waste discharge plan creation support method that supports the creation of a radioactive waste discharge plan. The radioactive waste discharge plan creation support method of the present invention predicts, for radioactive waste whose amount of radioactivity is above a specified value, the time when the amount of radioactivity will fall below a specified value based on information about the amount of radioactivity and the date the amount of radioactivity was measured, and creates a radioactive waste discharge plan based on the predicted time.

[0018] According to the radioactive waste discharge plan creation support system and radioactive waste discharge plan creation support method of the present invention, for radioactive waste whose amount of radioactivity is equal to or greater than a specified value, the time when the amount of radioactivity will fall below the specified value is predicted based on information about the amount of radioactivity and the date the amount of radioactivity was measured, and a radioactive waste discharge plan is created based on the predicted time. This will allow us to know when the amount of radioactivity in radioactive waste will fall below the specified value, making it possible to reuse radioactive waste whose amount of radioactivity has fallen below the specified value earlier, and enabling radioactive waste to be disposed of more efficiently. This reduces the amount of radioactive waste to be managed, increases the amount of reusable clearance waste, and reduces the costs of managing low-level radioactive waste.

[0019] According to the radioactive waste storage plan creation support system of the present invention, for radioactive waste whose amount of radioactivity is equal to or greater than a specific radioactivity level, the storage plan creation unit predicts the time when the amount of radioactivity will fall below the specific radioactivity level based on the information on the amount of radioactivity and the date the amount of radioactivity was measured stored in the memory unit, classifies the radioactive waste by radioactivity level based on the predicted results, and creates a plan for storing the radioactive waste based on the predicted time. This allows radioactive waste to be classified by radioactivity level, so that radioactive waste of each radioactivity level can be managed appropriately, thereby making it possible to reduce the cost of managing radioactive waste.

[0020] In the radioactive waste discharge plan creation support system and the radioactive waste discharge plan creation support method, the specified value may be a clearance level or a specific radioactivity level. With this configuration, it is possible to know when the amount of radioactivity in radioactive waste will fall below the clearance level or a specific radiation level, so that it is possible to change the management status of radioactive waste at an early stage when the amount of radioactivity falls below the clearance level or a specific radiation level, thereby reducing management costs.

[0021] In the above-mentioned radioactive waste discharge plan creation support system and the above-mentioned radioactive waste discharge plan creation support method, the radioactive waste can be further configured to be radioactive waste generated during plant dismantling work and radioactive waste stored in a storage site. With this configuration, it is possible to predict when the amount of radioactivity of radioactive waste stored at a storage site will fall below a specified value, making it possible to create a discharge plan that efficiently processes a larger amount of radioactive waste. Furthermore, in this configuration, a process plan can be created to simultaneously measure the radioactivity concentration of radioactive waste generated during the plant dismantling work and radioactive waste stored in the storage area, and the storage period and amount of radioactive waste can be evaluated to create a radioactive waste disposal plan. With this configuration, a process plan is created in which the radioactivity concentration of radioactive waste generated during plant dismantling work and radioactive waste stored in storage areas is measured at the same time, making it possible to create a discharge plan for more efficient processing.

[0022] In the radioactive waste discharge plan creation support system described above, the discharge plan creation unit can further be configured to create work process plans for each management facility that manages the radioactive waste based on the radioactive waste discharge plan. In this configuration, a work process plan is also created for each management facility that manages radioactive waste, so that a discharge plan can be created for each radioactive waste management facility.

[0023] The radioactive waste discharge plan creation support system described above may further include an update unit, in which the memory unit stores the discharge plan created by the discharge plan creation unit in addition to the information on the amount of radioactivity of the radioactive waste and the date on which the amount of radioactivity was measured, and the update unit corrects and updates the information on the amount of radioactivity of the radioactive waste and the date on which the amount of radioactivity was measured, and the discharge plan, stored in the memory unit, based on the results of verification work based on the discharge plan created by the discharge plan creation unit. In this configuration, the update unit corrects and updates the information on the amount of radioactivity of the radioactive waste and the date of measurement of the amount of radioactivity, as well as the discharge plan, stored in the memory unit, based on the results of verification work based on the discharge plan created by the discharge plan creation unit, thereby making it possible to create a discharge plan for treating radioactive waste more accurately and efficiently.

[0024] The radioactive waste discharge plan creation support system described above may further comprise a display unit, which may be configured to display cumulative changes in the amount of waste discharged and the amount of waste stored. In this configuration, the display unit displays the amount of waste discharged and the cumulative change in the amount of waste, so that it becomes possible to know the amount of waste discharged and the cumulative change in the amount of waste in concrete terms.

[0025] In the radioactive waste discharge plan creation support system described above, the discharge plan creation unit can further be configured such that, for radioactive waste whose amount of radioactivity is equal to or greater than a specified value, instead of predicting the time when the amount of radioactivity will fall below a specified value based on the information about the amount of radioactivity and the date the amount of radioactivity was measured stored in the memory unit, the discharge plan creation unit predicts the time when the amount of radioactivity will fall below a value obtained by multiplying the specified value by a coefficient less than 1 based on the information about the amount of radioactivity and the date the amount of radioactivity was measured stored in the memory unit, and compares the reduced amount of man-hours for discharge processing with the increased amount of man-hours for storage to evaluate the storage period and amount of radioactive waste, and create a radioactive waste discharge plan. In this configuration, the time when the amount of radioactivity will fall below a specified value multiplied by a coefficient less than 1 is predicted, and the storage period and storage amount of radioactive waste are evaluated by comparing the reduced number of man-hours for discharge processing with the increased number of man-hours for storage, and a radioactive waste discharge plan is created, so by multiplying the specified value by a coefficient less than 1, it is possible to determine which waste can be discharged with certainty. Also, as the judgment standard value decreases, the amount of waste that can be discharged decreases and the amount of waste that must be managed as radioactive waste increases, but the storage period and storage amount are evaluated by comparing the reduced number of man-hours for discharge processing with the increased number of man-hours for management, and a discharge plan is created, so radioactive waste can be efficiently treated and managed.

[0026] In the above-mentioned method for supporting the creation of a radioactive waste discharge plan, the radioactive waste can further be radioactive waste generated during plant dismantling work and radioactive waste stored in a storage location, and a target activity can be selected from the discharge plan process and the activity can be assigned to a person involved in the discharge plan. In this configuration, a target activity is selected from the process of the emission plan, and the activity is assigned to the participants of the emission plan, thereby making it possible to create an emission plan including the participants of each activity.

[0027] In the radioactive waste discharge plan creation support system, radioactive waste storage plan creation support system, and radioactive waste discharge plan creation method of the present invention, the radioactive waste for which a discharge plan is created can be various components such as plant equipment and piping, and cut and disassembled pieces of those components.

[0028] In the radioactive waste discharge plan creation support system, radioactive waste storage plan creation support system, and radioactive waste discharge plan creation method of the present invention, the time when the amount of radioactivity will be below a specified value (for example, a clearance level or a specific radiation level) can be specified in various periods such as a day, a week, a week (early, middle, or late), a month, a quarter of a year, a year, etc. Of these, by specifying the time as a specific day, as in the examples described below, a more accurate and efficient discharge plan can be created. [Example]

[0029] Specific embodiments of the present invention will be described below with reference to the drawings.

[0030] FIG. 1 is a block diagram showing the overall configuration of a radioactive waste discharge plan creation support system according to an embodiment of the present invention. The radioactive waste discharge plan creation support system shown in Figure 1 includes an input device 10, an output device 20, a demolition waste measurement and storage data extraction unit 30, a waste database registration unit 40, a clearance discharge plan creation unit 50, a performance and plan update unit 60, a plant equipment 3D model database 300, a waste database 400, and a clearance discharge plan database 500. The waste database registration unit 40 corresponds to the "storage unit" of the present invention, the clearance discharge plan creation unit 50 corresponds to the "discharge plan creation unit" of the present invention, and the performance / plan update unit 60 corresponds to the "update unit" of the present invention.

[0031] The radioactive waste discharge plan creation support system shown in FIG. 1 operates as follows. First, the radioactive waste discharge plan creation support system of this embodiment is started up when data relating to the range of the dismantling target is input from the input device 10 as a trigger. The demolition waste measurement and storage data extraction unit 30 then searches and extracts information such as the placement coordinates and direction of objects within the demolition range (plant components such as equipment and piping, and cut and dismantled pieces of the components), as well as radioactive concentration information, from the plant equipment 3D model database 300. Next, the waste database registration unit 40 is started up, and the dose rate measured from the dismantling object, the measurement date, the radioactive concentration, and the date on which it can be discharged as clearance waste are registered in the waste database 400. Then, the clearance discharge plan creation unit 50 is started up, and a clearance discharge plan is created based on the clearance possible date of the target waste registered in the waste database 400, and is registered in the clearance discharge plan database 500.

[0032] Thereafter, when the actual waste disposal work is started and the collection of performance data is completed, the performance / plan update unit 60 is started up in response to an instruction from the input device 10. Then, based on the verification work carried out in the waste disposal work, the measurement information of the waste to be disposed of in the next and subsequent clearance discharge work, including the waste that was not discharged, is updated and registered in the waste database 400, and the revised clearance discharge plan is registered in the clearance discharge plan database 500. Finally, based on the updated information of various databases in response to instructions from the input device 10, related information is displayed on the output device 20.

[0033] FIG. 2 shows an example of assigning a radioactivity inventory to a 3D model of a plant for which a discharge plan is to be created. In Figure 2, radioactivity concentrations are assigned as a radioactivity inventory to the containment vessel, pressure vessel, and surrounding piping components and other equipment and parts installed inside the reactor building of a nuclear power plant, so the distribution of radioactivity concentrations can be seen from Figure 2. Specifically, Figure 2 shows the radioactivity concentrations divided by radioactivity level (L1, L2, L3, CL, NR). Of the items listed in the legend of Figure 2, L1 to L3 (3010 to 3030) are called low-level radioactive waste, and are waste that will ultimately be managed by means such as underground burial. CL(3040) is also called clearance waste, which is concrete or metal waste that does not need to be treated as radioactive material. Also, NR(3050) is waste that is not radioactive.

[0034] In nuclear power plants, NR typically accounts for 95% of the waste, followed by clearance waste, which can be reused as materials for equipment used in nuclear power plants and general industrial equipment. Furthermore, the cost of facilities required for managed waste decreases as it progresses from L1 to L3. In other words, by reducing the amount of waste managed as L1 and increasing the amount of waste managed as L3, and by increasing the amount of waste discharged from L3 to CL, the costs associated with waste management can be reduced.

[0035] In the example cross-sectional view of the 3D plant model shown in Figure 2, the reactor internals 3011 after nuclear fuel removal often become L1 waste 3010, the surrounding pressure vessel 3021 becomes L2 waste 3020, and the surrounding structures, piping, equipment, and piping components 3031 and 3032 become L3 waste 3030. The farther away from the reactor core is, the more equipment and piping components 3041, 3042, and 3043 that become clearance waste 3040. Furthermore, even among clearance waste, there are cases where radioactive materials adhere to localized contamination due to fluid flowing at a relatively slower speed than other areas during operation, resulting in locally contaminated areas 3033, 3034 that must be treated as L3 waste 3030. Even for such locally contaminated areas, some can be treated as clearance waste by delaying the discharge time in consideration of the half-life of the radionuclides.

[0036] FIG. 3 is a diagram showing an example of a waste repository and a waste container for which a discharge plan is to be created. As shown in FIG. 3, radioactive waste 4111 to be managed is stored in a waste storage container 4011, and this waste storage container 4011 is placed in a plant building or a waste storage facility 4000 and managed therein. Here, the radioactive waste 4111 is stored in a waste storage container 4011 in an easily accessible state so that radiation can be measured again easily, with the aim of lowering the management level of low-level radioactive waste or discharging it outside the building / site as clearance waste.

[0037] FIG. 4 is a diagram illustrating an example of a plant equipment 3D model database. In FIG. 4, ND stands for not detected, and indicates that the value was below the detection limit of the detector used for the measurement. In FIG. 4, each piece of equipment and piping component to be dismantled is uniquely identified by the identifiers of the building, system, and equipment (equipment or piping component). The table for managing information includes radioactivity concentration (hereinafter referred to as inventory) 310 of the identified part information and information 320 relating to the geometrical shape arrangement. Inventory 310 consists of nuclides (H3 (tritium), Be10 (beryllium), Co60 (cobalt), etc.) that were generated when components were activated by neutrons emitted from the reactor core during plant operation, and contaminant nuclides that adhered to the inside of equipment and piping due to the circulation of water and steam fluids within the plant, and is listed in numerical values ​​in units of Bq / t. The information 320 relating to the placement of the geometric shape includes the placement coordinates, shape, dimensions, and placement direction of the representative points of the equipment and piping parts.

[0038] FIG. 5 is a diagram showing an example of the configuration of the waste database. As shown in FIG. 5, a typical table constituting the waste database 410 includes an area 411, a system 412, an identifier ID 413, a type of equipment and piping 414, dose rate measurement data in mSv / h 415, a measurement date D M A representative table constituting the waste database 410 further stores the radioactivity A calculated from the dose rate and for each nuclide (e.g., Co-60), the determination result 417 as to whether clearance is possible, and the clearance possible date D when the level can be reduced to or below the clearance level. C 418, is stored. The judgment result 417 is written as <0.1 when radioactivity A [Bq / g] is below the clearance level, and >0.1 when radioactivity A [Bq / g] is above the clearance level. Clearance date D C 418 is calculated according to formula 420 for determining whether or not a nuclide can be removed as clearance waste. Judgment formula 420 is measurement date D M From 416 and radioactivity A, the clearance date D is calculated using the following formula (1): C In the following formula (1), T is the elapsed time from the initial measurement time, T 1 / 2 is the half-life of the nuclide whose radioactivity A was measured. D C =D M +(ln(A / 0.1)) / 0.693*T / T 1 / 2 (1)

[0039] In Figure 5, the waste with ID 413 B001 does not need to be managed because its radioactivity A (0.01) is below the clearance level, and it can be recycled or disposed of. C The column for 418 is blank. In addition, waste with ID413 P012 has radioactivity A (0.15) above the clearance level, so it is waste that needs to be managed. C In column 418, the clearance date D calculated by the above formula (1) is entered. C is stated.

[0040] FIG. 6 is a diagram showing an example of a second configuration of the waste database. The difference between the waste database in Figure 6 and the waste database in Figure 5 is that the attribute items in the table are radioactivity A and clearance date D. C 418, with a half-life of T 1 / 2 Based on this formula, the measurement date D M Using 416 and Radioactivity A, the radioactivity at the time of waste discharge and the clearance date can be calculated on an as-needed basis, rather than using static values ​​stored in a database.

[0041] FIG. 7 is a diagram showing an example of a clearance waste discharge plan process created by the discharge plan creation support system. FIG. 7 shows an example clearance waste discharge planning process 510 for discharging clearance waste in stages.

[0042] In the clearance waste discharge planning process shown in Figure 7, the basic pattern is a process pattern 520 consisting of activity elements such as dismantling 521, measurement 522, decontamination 523, radioactive concentration measurement 524, recycling or disposal of clearance waste 525, and waste storage and management 526. The work period for each activity in the process pattern 520 can be calculated by multiplying the amount of waste generated by the processing efficiency, so the overall work period for the process pattern 520 can be calculated as the sum of the work periods for each activity.

[0043] Also, the process pattern 520 is duplicated 530 for the next clearance waste treatment process 540. Then, depending on the amount of clearance waste to be generated, the work periods of each activity of the next clearance waste treatment process 540, namely, dismantling 531, measurement 532, decontamination 533, radioactivity concentration measurement 534, clearance waste recycling or disposal 535, and waste storage and management 536, are calculated and applied.

[0044] Here, the waste that is recycled or disposed of is excluded from the waste that is managed at the plant, so if the amount of waste that is recycled or disposed of can be increased, the amount of waste that is managed at the plant can be reduced.

[0045] FIG. 8 is a flowchart of an example of a process for generating a radioactive waste consolidation planning process or a clearance discharge planning process. The flow of the generation process shown in FIG. 8 is as follows. In creating a discharge planning process for clearance waste, first, the scope of the demolition target (building, area, equipment) is designated (step S210). Next, the demolition waste measurement and storage data extraction unit 30 searches and reads out information such as the placement coordinates and placement direction of objects (equipment, piping, etc.) within the area to be demolitioned, and information on the amount of radioactivity (concentration, etc.) from the plant equipment 3D model database 300 (step S230). Next, the waste database registration unit 40 is started, and the waste database registration unit 40 registers the measured dose rate obtained by measuring the demolition object, the measurement date, the radioactivity concentration estimated from the measured dose rate, and the clearance date on which the object can be discharged as clearance waste in the waste database 400 (step S240). Then, the clearance discharge plan creation unit 50 is started, and the clearance discharge plan creation unit 50 creates a clearance discharge plan based on the clearance possible date of the target waste registered in the waste database 400, and registers the created clearance discharge plan in the clearance discharge plan database 500 (step S250).

[0046] Thereafter, when the actual waste disposal work is started and the collection of performance data is completed, the performance / plan update unit 60 is started up in response to an instruction from the input device 10. Then, based on the verification work carried out in the waste disposal work, the performance / plan update unit 60 updates and registers in the waste database 400 the measurement information on the amount of radioactivity of the waste to be disposed of in the next and subsequent clearance discharge work, including the waste that was not discharged, and also registers the revised clearance discharge plan in the clearance discharge plan database 500 (step S260). By performing this processing, the waste database 400 and clearance discharge plan database 500 are updated in accordance with the measurement information, making it possible to create discharge plans for waste disposal more accurately and efficiently.

[0047] FIG. 9 is a diagram showing an example of a storage location other than a plant building. Here, it is assumed that a worker 8001 belonging to company A is involved in work related to waste discharge at a power plant 3001. In this case, waste discharged from power plant 3001 may be sent to verification facility 3052, or may be stored in storage facility 3051 because it is assumed to have a relatively high level of radioactivity based on on-site measurements and the location of components used within power plant 3001. Workers 8002 will be working in storage facility 3051, and workers 8003 will be working in verification facility 3052. In addition, waste that does not need to be treated as radioactive waste or that is not radioactive waste is recycled as industrial waste 3059 or resources 3060. These operations are handled by worker 8004 of industrial waste collection company B and worker 8005 of resource waste collection company C. Clearance waste that has been confirmed by verification facility 3052 to be radioactive below the clearance level is taken over by worker 8005 of resource waste recovery company C and reused as a resource. Radioactive waste that is above the clearance level but below L3 level and cannot be treated as radioactive waste below the clearance level in the near future is stored in a trench (trench 3056) in the land near the site, and then buried and managed by worker 8006 of company A. Waste that is above the clearance level at Verification Facility 3052 and is expected to be reduced to below the clearance level in the near future within a few years will be temporarily stored in Storage Facility 3051, and when the time comes, the radioactivity level will be checked again at Verification Facility 3052. Of the waste stored in storage facility 3051, L2 waste storage container 3054 is buried and managed in shallow underground storage facility 3057 at the low-level radioactive waste disposal center managed by company D, and worker 8007 is in charge of burying it. In addition, L1 waste storage container 3055 is managed in underground disposal site 3058, which is 70 meters deep or more and managed by company E, and worker 8008 is in charge of burying it. The companies and workers managing the facilities described here are considered to be part of an organization consisting of multiple entities in terms of both structure and number of people. As mentioned above, radioactive waste is repeatedly stored and discharged from the plant dismantling work to reclamation or final disposal, and the radioactive waste discharge plan is not limited to the discharge plan from the power plant. The release plan creation support system can create release plans not only for radioactive waste generated during plant decommissioning work, but also for radioactive waste stored in one or more storage locations.

[0048] FIG. 10 is a diagram showing an example of process and procedure information for radioactive waste treatment and storage work for each waste treatment company. Here, apart from each operation process (521 to 536) shown in 510, operation processes 550 for each management facility are expressed for management facilities such as the management facilities (3001, 3051, 3052, 3056 to 3060) shown in Fig. 9, and activities 561 to 578 correspond to the operation process 510. In addition, the operation processes for each management facility are associated with the corresponding company and the number of workers involved, etc.

[0049] FIG. 11 is a flowchart of the process for generating process and procedure information for a plurality of radioactive waste treatment and storage operations. Figure 11 shows how to create the work process 550 for each management facility in Figure 10. Similarly, when looking at the work process 510 in Figure 10, the clearance discharge plan creation unit 50 (Figure 1) selects one activity with an early start time from the work process 510 as the target activity for creating the work process 550 for each management facility (step S510). Then, a company and person in charge are assigned based on the facility information of the work target (step S520). The above is repeated until there are no more activities to which a person has not been assigned (step S530). Based on the process of FIG. 11, a work schedule 550 for each management facility is generated.

[0050] FIG. 12 is a diagram showing an example of a visualized display of the generated radioactive waste consolidation planning process or clearance discharge planning process. FIG. 12 shows an example visualization 2000 of a radioactive waste consolidation planning process or clearance discharge planning process. In the operation of the display screen of FIG. 12, it is assumed that when the XX purification system 2070 is in the selection state 2080 as the target system 2060, the process plan creation instruction button 2090 is pressed. At this time, a graph 2010 of cumulative changes in the amount of waste discharged and the amount of waste stored is displayed, centering on the clearance waste discharge planning process 2020 shown in FIG. Also displayed are a 3D model 2030, a waste storage facility 2040, and a waste storage container 2050 corresponding to the target system 2060. Furthermore, by pressing the reflect actual results button 2140, the results of discharge of clearance waste or the results of management of waste that could not be discharged can be reflected in the discharge plan process 2020 and the cumulative change graph 2010 of waste discharge and waste storage amount, making it possible to visualize them. From the visualization display screen 2000 of the clearance discharge planning process, it is possible to press and activate the DB registration button 2100, the assignment button 2110, the storage location button 2120, and the pile button 2130. These functions will be explained using examples of the screens that appear after each button is pressed in Figs. 13 to 17.

[0051] FIG. 13 shows an example of an input / output interface screen for registering in the database the time when low-level radioactive waste will fall below the clearance level. Pressing the DB registration button 2100 on the clearance release planning process visualization display screen 2000 launches this screen 2101, which displays the clearance judgment table 2107. The area, system, ID, type, and nuclide are selected from drop-down lists from the data registered in the database. After entering the measurement data and measurement date, the system calculates the radioactivity based on a formula it has, and then determines whether the clearance is OK or NG according to the clearance judgment criteria using a judgment formula registered in the database. Furthermore, for items that are NG for clearance but can be cleared in the future, the date on which clearance will be possible is automatically displayed. After the data has been input, and it is confirmed that the input information displayed in the clearance determination table 2107 and the automatically calculated information are correct, the DB update button 2102 is pressed. If the above information is recognized as incorrect, the cancel button 2104 is pressed to cancel the input contents. If the user simply wants to display the information registered in the database, the user presses the DB display button 2103, checks the contents, and if any corrections are required, corrects the values ​​in the clearance determination table 2107 and updates the contents of the database using the DB update button 2102. A radioactivity concentration standard Di table 2108, which is the clearance judgment standard, is displayed by pressing the concentration standard button 2106. In addition, the CL formula confirmation button 2105 is pressed to confirm the formula 2109 for the clearance possible date.

[0052] FIG. 14 is an example of an input / output interface screen for assigning a contractor to handle low-level radioactive waste or clearance waste or to handle storage work. The person-in-charge assignment input / output interface screen 2111 is started by pressing a person-in-charge assignment button 2110 on the clearance discharge planning process visualization display screen 2000. For each activity such as dismantling and measurement in the clearance waste discharge planning process 2020 shown in Figure 12, the activity in the work process 2061 for each management facility is set by inputting the end date, for example, "February 2, Year 11," using the activity creation cursor 2064 and the work period specification interface 2066. The management facility is specified by selecting one from the drop-down list 2062, and if the display exceeds the screen for a long process period, move the track positions 2021, 2022, 2063, 2065 of the scroll bar to the desired position. After the handling assignment has been finalized, the database is updated by pressing the assignment update button 2112. Alternatively, if there is a problem with the settings, the cancel button 2114 is pressed to cancel the change in handling assignment. If one simply wants to visualize the work processes registered in the database or the work processes for each facility, the allocation display button 2113 is pressed to display the contents of the database.

[0053] FIG. 15 shows an example of a visualization display screen relating to a storage location for low-level radioactive waste. The storage location management screen 2121 is launched by pressing the storage location button 2120 on the clearance discharge planning process visualization display screen 2000. Here, after adjusting the display time with the symbol 2122 or 2123, the plan button 2171 or the actual result button 2172 is pressed to visualize the amount of waste managed within the power plant site 2124 and outside the site 2125 as planned or actual results, and is used as monitoring information. The information for monitoring when waste is discharged is displayed separately for inside the power plant site 2124 and outside the site 2125 . Within the power plant site 2124, where the reactor building, turbine building, etc. are located, the weight of waste of L3 level or higher in the waste storage building 2126, the weight of L3 waste in the trench disposal area 2127, the amount of metal and concrete waste in the clearance waste storage building 2128, and the weight of metal, concrete, and other waste 2129 as the total weight of waste discharged off-site are displayed. The off-site waste monitoring item 2125 of the power plant displays the weight 2201 of industrial waste and clearance waste handed over to off-site contractors, the weight 2202 of L2 waste discharged to low-level radioactive waste disposal center A, and the weight 2203 of L1 waste discharged to underground disposal center B.

[0054] FIG. 16 is an example of a display screen of a graph showing the change over time in the allocation status of the contractors involved in the processing or storage of low-level radioactive waste or clearance waste. The worker operation status pile screen 2131 is launched by pressing the pile button 2130 on the clearance discharge planning process visualization display screen 2000. In the graph display screen example 2134, when the plan button 2132 or the result button 2133 is pressed and a power plant 2135 or a storage facility 2136 is selected from the drop-down list, the worker allocation plan or the change in the result over time at each location is displayed. If the waste management location or the time range of the process cannot be displayed on the screen, the user can move to the position they want to check and check the values ​​by operating the track positions 2138 and 2137 of the scroll bar.

[0055] Figure 17 is a diagram showing an example of the configuration of a waste database for making a decision to lower the radioactivity concentration level of low-level radioactive waste by one level, as an example different from the example of the configuration of the waste database 410 shown in Figure 5.

[0056] In FIG. 17, items that differ from the waste database 410 shown in FIG. 5 are listed among the management items of the waste database 430. The table stored in the waste database 430 shown in Figure 17 stores information related to the nuclide 431 and measurement date 415 corresponding to the identifier (ID) 413, information on the radioactivity A [Bq / t] of each nuclide 417, and, if the management level can be changed, for example from L2 to L3, within an appropriate time range (for example, within 100 years), the earliest management level change date 432.

[0057] In addition, a table 433 that stores the relationship between nuclides, half-lives, and upper concentration limits [Bq / t] of low-level radioactive waste is managed together with the waste database 430.

[0058] In Figure 17, the waste with ID413 A001 has radioactivity A (1.0 × 10 9 ) is the upper limit of the L3 concentration of the nuclide Co-60 listed in Table 433 (1 × 10 10 ), it is below the clearance level and does not require management, so it is recycled or disposed of. Therefore, the column for management level change date 432 is blank. In addition, the waste with ID413 A002 has radioactivity A (2.0 × 10 14 ) is the upper limit of the L2 concentration of the nuclide Cs-137 listed in Table 433 (1 × 10 14 ) or more, it is managed as L1 level. The column for management level change date 432 lists the date on which the management level can be changed from L1 level to L2 level, calculated from the value of radioactivity A.

[0059] By using this waste database 430, it becomes possible to transition the management classification of low-level radioactive waste to a lower cost classification (L1 → L2, L2 → L3) at an appropriate time, thereby reducing the management cost of low-level radioactive waste.

[0060] As described above, according to the radioactive waste discharge plan creation support system of this embodiment, the clearance date when the amount of radioactivity will be below the clearance level is predicted based on information on the amount of radioactivity and information on the date the amount of radioactivity was measured, and a waste discharge plan is created based on the predicted clearance date. This will allow the date on which clearance is possible to be determined, making it possible to reuse waste whose radioactivity has fallen below the clearance level at an early stage. Therefore, it is possible to reduce the amount of radioactive waste to be managed, increase the amount of reusable clearance waste, and reduce the cost of managing low-level radioactive waste. This will enable the safe management of large amounts of low-level radioactive waste, such as metals and concrete, generated during the dismantling and operation of nuclear power plants. Therefore, it will be possible to realize a recycling-oriented society in which constituent materials are recycled and disposed of appropriately and to a minimum extent.

[0061] (Variation) In the above-described embodiment, a plant 3D model is used as position information of the constituent members of the plant or the cut and disassembled pieces of the constituent members of the plant. In the present invention, the position information of the constituent members of the plant or the cut and disassembled pieces of the constituent members of the plant is not limited to the plant 3D model, and other forms of information can be used. For example, in a nuclear power plant building, the vertical length from floor to ceiling is sufficiently small compared to the horizontal length, so it is also possible to use position information that specifies the position in planar coordinates (a 2D model of the floor plan). It is also possible to use polar coordinates instead of the usual x, y, and z coordinates of length, width, and height, and to adopt location information specified by the direction and distance from a specific point. The direction can be specified by two parameters, such as the longitude and latitude of the Earth.

[0062] In the above-described embodiment, data regarding the range of the demolition target was input from the input device 10, and the demolition waste measurement and storage data extraction unit 30 searched and extracted the location information and radioactive concentration information of the objects within the range of the demolition target from the plant equipment 3D model database 300. The present invention is not limited to such a configuration, and it is also possible to configure it so that, for example, a database of information such as the location information and radioactivity concentration information of the target object is provided from outside the discharge plan creation support system and input into a memory unit such as the waste database registration unit 40 in Figure 1. Therefore, for example, it is possible to have a customer provide a database of information on objects owned by the customer, and create a disposal plan using the disposal plan creation support system of the present invention.

[0063] In the above-described embodiment, the waste database registration unit 40 predicts the clearance possible date on which waste can be discharged as clearance waste, and registers the clearance possible date in the waste database 400. The present invention is not limited to such a configuration, and for example, it is also possible to configure a discharge plan creation unit such as the clearance discharge plan creation unit 50 in Figure 1 to predict the date on which clearance is possible, based on other information about the waste (measurement date, radiation concentration) registered in the waste database 400. It is also possible to configure the system so that the clearance date is predicted by another section, such as another section provided between the registration section and the discharge plan creation section. As with the clearance possible date, the control level change date can be predicted by any of the registration section, the discharge plan creation section, or another section.

[0064] As a modified example, it is also possible to configure the system so that the standard clearance level judgment reference value (such as 0.1 Bq / g in Figure 5) is multiplied by a safety factor to determine which waste can be reliably discharged as clearance material. The safety factor can be a number less than 1, for example, 0.1, 0.5, 0.8, etc. However, by multiplying the standard clearance level by a safety factor, the standard value becomes smaller and the amount of waste that can be discharged through clearance decreases, so the amount of waste that needs to be managed as radioactive waste increases. In this case, the man-hours for clearance discharge processing, which will decrease, are compared with the man-hours for management, which will increase, and the management period and management amount are evaluated to create a discharge plan.

[0065] It should be noted that the present invention is not limited to the above-described embodiments and examples, and includes various modifications. For example, the above-described embodiments and examples have been described in detail to clearly explain the present invention, and the present invention is not necessarily limited to those having all of the described configurations. [Explanation of symbols]

[0066] 10 Input device, 20 Output device, 30 Demolition waste measurement and storage data extraction unit, 40 Waste database registration unit, 50 Clearance discharge plan creation unit, 60 Results and plan update unit, 300 Plant equipment 3D model database, 400 Waste database, 500 Clearance discharge plan database

Claims

1. a storage unit for storing information on the amount of radioactivity of the radioactive waste and the date of measurement of the amount of radioactivity; and a discharge plan creation unit that, for the radioactive waste whose amount of radioactivity is equal to or greater than a specified value, predicts the time when the amount of radioactivity will be equal to or less than a specified value based on the amount of radioactivity and information on the date of measurement of the amount of radioactivity stored in the storage unit, and creates a discharge plan for the radioactive waste based on the predicted time. A support system for creating plans for the discharge of radioactive waste.

2. The specified value is a clearance level or a specific radioactivity level.

2. The radioactive waste discharge plan creation support system according to claim 1.

3. The radioactive waste is radioactive waste generated during the dismantling of the plant and radioactive waste stored in storage facilities.

2. The radioactive waste discharge plan creation support system according to claim 1.

4. The discharge plan creation unit creates a process plan for simultaneously measuring the radioactivity concentration of the radioactive waste generated during the dismantling work of the plant and the radioactive waste stored in a storage location, evaluates the storage period and storage amount of the radioactive waste, and creates a discharge plan for the radioactive waste.

4. The radioactive waste discharge plan creation support system according to claim 3.

5. The discharge plan creation unit also creates a work process plan for each management facility that manages the radioactive waste based on the discharge plan for the radioactive waste.

2. The radioactive waste discharge plan creation support system according to claim 1.

6. The storage unit stores the discharge plan created by the discharge plan creation unit in addition to information on the amount of radioactivity of the radioactive waste and the date on which the amount of radioactivity was measured, The apparatus further includes an updating unit that corrects and updates the information on the amount of radioactivity of the radioactive waste and the date of measurement of the amount of radioactivity stored in the storage unit and the discharge plan based on the results of verification work based on the discharge plan created by the discharge plan creation unit.

2. The radioactive waste discharge plan creation support system according to claim 1.

7. A display unit that displays the discharge plan created by the discharge plan creation unit is further provided, The display unit displays the cumulative change in the amount of waste discharged and the amount of waste stored.

2. The radioactive waste discharge plan creation support system according to claim 1.

8. The discharge plan creation unit, for the radioactive waste whose amount of radioactivity is equal to or greater than a specified value, predicts the time when the amount of radioactivity will be equal to or less than a specified value based on the information about the amount of radioactivity and the date of measurement of the amount of radioactivity stored in the storage unit, and instead predicts the time when the amount of radioactivity will be equal to or less than a value obtained by multiplying the specified value by a coefficient less than 1 based on the information about the amount of radioactivity and the date of measurement of the amount of radioactivity stored in the storage unit, and compares the reduced number of man-hours for discharge processing with the increased number of man-hours for storage to evaluate the storage period and storage amount of the radioactive waste, and creates a discharge plan for the radioactive waste.

2. The radioactive waste discharge plan creation support system according to claim 1.

9. a storage unit for storing information on the amount of radioactivity of the radioactive waste and the date of measurement of the amount of radioactivity; and a storage plan creation unit that, for the radioactive waste whose amount of radioactivity is equal to or greater than a specific radioactivity level, predicts the time when the amount of radioactivity will fall below the specific radioactivity level based on the information on the amount of radioactivity and the date of measurement of the amount of radioactivity stored in the storage unit, classifies the radioactive waste by radioactivity level based on the predicted results, and creates a plan for storing the radioactive waste based on the predicted time. A support system for creating storage plans for radioactive waste.

10. For radioactive waste with a radioactivity level equal to or greater than a specified value, predict the time when the radioactivity level will fall below the specified value based on the amount of radioactivity and the date of measurement of the amount of radioactivity, and create a discharge plan for the radioactive waste based on the predicted time. How to prepare a plan for the discharge of radioactive waste.

11. The specified value is a clearance level or a specific radioactivity level. The method for creating a radioactive waste discharge plan according to claim 10.

12. The radioactive waste is radioactive waste generated during the dismantling of the plant and radioactive waste stored in storage facilities. The method for creating a radioactive waste discharge plan according to claim 11.

13. Select a target activity from the process of the emission plan and assign the activity to a person involved in the emission plan. The method for creating a radioactive waste discharge plan according to claim 12.

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