A calculation method for spent fuel selection and container matching during spent fuel transportation in nuclear power plants

Abstract

The present invention discloses a method for calculating spent fuel selection and container matching during spent fuel transportation of a nuclear power plant, including taking a receiving facility pool as a first circulation unit, circulating from a pool with the highest priority to a pool with the lowest priority, taking a unit pool as a second circulation unit, and the circulating units in the second circulation unit are nuclear power units that can be received in the receiving conditions of the receiving facility, and circulating from the unit pool with the highest priority to the pool with the lowest priority. The present invention calculates and selects the spent fuel assemblies of the nuclear power plant corresponding to each receiving pool through the unique receiving conditions of each receiving facility pool, and optimizes the matching process of spent fuel and containers by combining an integer linear programming method, effectively improving the formulation of spent fuel transportation plans and transportation efficiency, not only realizing the maximum utilization of limited container resources, ensuring the loading of more spent fuel assemblies, but also reducing human errors in the process of spent fuel selection and container matching, saving transportation costs, and significantly enhancing economic benefits.

Description

Technical Field

[0001] The invention relates to the technical field of spent fuel transportation, and in particular to a spent fuel selection and container matching calculation method in a spent fuel transportation process of a nuclear power plant. Background Art

[0002] Spent fuel is nuclear fuel that has been exposed to radiation and used in nuclear reactors. It contains a large amount of radioactive elements and is highly radioactive. Most of my country's nuclear power plants are located in the southeast coastal areas, while the spent fuel receiving facilities are in the northwest. The spent fuel is far away from the reactor for storage and transportation, and the risk is high. Therefore, before starting the transportation mission of spent fuel, a detailed transportation plan needs to be formulated. The spent fuel transportation planning process is complex and needs to consider many factors such as the operation and refueling plan of the nuclear power plant, the receiving and processing capacity of the receiving facilities, the availability of spent fuel transportation containers and tools, and the personnel team. Only by comprehensively considering all factors can an efficient and reasonable transportation plan be formulated to ensure that highly radioactive fuels such as spent fuel can be transported in an orderly, safe and efficient manner.

[0003] In view of the above problems, the present invention provides a reasonable and efficient method for calculating spent fuel selection and container matching during spent fuel transportation in a nuclear power plant. Summary of the invention

[0004] The invention provides an efficient spent fuel selection and container matching calculation method in the spent fuel transportation process of a nuclear power plant.

[0005] The purpose of the present invention is to provide a method for calculating spent fuel selection and container matching during spent fuel transportation in a nuclear power plant, including a sequence of components that can be received, transportation volume matching, a sequence of components that can be loaded, container matching, secondary matching, and resource allocation and capacity building. The calculation process of the sequence of components that can be received is:

[0006] The component sequence in the nuclear power plant pool is read in sequence to determine whether the component parameters of the component meet the acceptable component parameters of the first circulation unit receiving facility pool. If so, the component is added to the acceptable component sequence; if not, the parameters of the next component are read and the above judgment process is repeated in sequence until all component sequences are judged. After the judgment is completed, the next unit pool in the circulation unit 2 is transferred to the same judgment until all units in the circulation unit 2 are cycled. At this time, a receivable component sequence that meets the receiving conditions of the circulation unit 1 receiving facility pool is summarized. The receivable component sequence includes all component sequences that meet its receiving conditions in each receivable nuclear power unit of the receiving facility.

[0007] The specific steps for container matching are as follows:

[0008] Step 1: Count the number of components that fit the unit and all types of containers , if the adaptability of a certain type of container Less than its load ,Right now , it means that the container cannot be fully filled when participating in the current transportation task of the unit, so the container type is excluded from participating in the next container combination for the unit components;

[0009] Step 2: Under the condition of limiting the number of container types, use the integer programming algorithm to first calculate the container matching solution that can transport the most components under the combination of multiple different types of containers, and then calculate the container matching solution under the condition of the number of available containers. Among them, the matching solution that does not consider the condition of the number of available containers is the solution to be confirmed. Through whether capacity construction is required, human judgment can be made to select the solution that conforms to the actual situation and is more reasonable; the matching solution that considers the condition of the number of available containers is the optimal solution without capacity construction, which can transport the components that can be received to the receiving facilities to the greatest extent;

[0010] Step 3: For each container, calculate the "exclusivity" of each spent fuel assembly that fits the container, and load assemblies with high exclusivity first. Components in the same loading area are loaded in descending order of cooling time;

[0011] Step 4: After loading is completed, compare with the container availability information and determine whether the combination is feasible. If the solution is not feasible due to lack of containers, it can be manually determined whether capacity building is required for the missing containers. If capacity building is not required, the solution is not feasible and the next solution is determined. If it is determined that capacity building is required for the containers, the capacity building needs are recorded and the solution is considered feasible.

[0012] Step 5: determine all container combinations in turn, and finally find the container combination that minimizes the margin and has a reasonable solution combination, which is the container combination required for the crew's current transportation task;

[0013] Step 6. After determining the container combination, the container information needs to be updated, the used containers should reduce their annual usage frequency, and the newly added containers should be automatically entered into the system for transportation.

[0014] Furthermore, the specific steps of volume matching are as follows:

[0015] Step 1: If , that is, the total number of the selected outbound component sequences is less than or equal to the maximum receiving capacity of the receiving facility. Without considering the container, this sequence can be fully received by the receiving facility. The amount will be directly used as the volume matching amount of the receiving facility , the number of components of each unit in the receivable component sequence can be counted separately As its export ;

[0016] Step 2: If , that is, the total number of the selected outbound component sequences is greater than the maximum receiving capacity of the receiving facility. Without considering the container, this sequence only has will be received by the receiving facility. The components will be sorted in descending order according to the percentage of water pool capacity used in all units in the second cycle, and the component with the longest cooling time in the unit with the largest current water pool capacity usage ratio will be selected. After the selection is completed, the water pool capacity usage ratio will be recalculated and the above selection process will be repeated. Each selection will be based on the current percentage of water pool capacity used by each unit as the sorting basis until the selection is full. components, at which point the receiving facility's transport capacity matches the The total number of components selected for each unit is used as the unit capacity matching quantity , if any The transport matching amount of each unit is summed up to get the transport matching amount of the receiving facility:

[0017]

[0018] Furthermore, the calculation process of the sequence of components that can be loaded is:

[0019] The above generated sequence of receivable components is screened in turn using the loading parameter conditions of each type of container currently available, and a sequence of loadable components is generated on this basis.

[0020] Furthermore, the specific steps of the secondary matching are as follows:

[0021] Step 1: When all units in the second cycle have been matched with containers, in order to maximize the use of receiving facilities for each transportation task, the component surplus of all units is summed up to obtain ,Sure Is it less than the minimum container "loading capacity"? If so, directly output the solution; if so, sort it again according to the proportion of the unit's pool capacity. This is taken as the “total load” for the unit and is calculated according to the above steps for container matching.

[0022] Furthermore, the specific steps for resource allocation and capacity building are as follows:

[0023] Step 1: For transportation tools, determine all transportation tools in turn. If the annual outbound volume <= Maximum annual loading , then the current transportation resources are sufficient to transport the current task, and there is no need to build capacity; the number of transportation resources required is:

[0024]

[0025] in, is the load capacity of a single transport vehicle, The annual frequency of use of the transport vehicle. If it is not an integer, it will be rounded up and added with one;

[0026] If the annual cargo package transportation volume >Maximum annual loading , then the current transportation resources are insufficient to transport the current task, so capacity building is needed, and the number of transportation resources required = Original transport quantity + Capacity building quantity , the number of transport capacity construction is:

[0027]

[0028] Step 2: For the personnel team, determine all teams in turn. If the annual outbound volume <= Maximum annual cargo handling capacity , the current human resources are sufficient to handle the current tasks, and there is no need for capacity building. The number of personnel teams required is:

[0029]

[0030] in, The processing capacity of a single group of single cargo packages. The annual working frequency of the team. If it is not an integer, it will be rounded up and added by one;

[0031] If the annual export volume >Maximum annual cargo package handling capacity , then the current human resources are insufficient to handle the current tasks, and capacity building is needed. = Original team number + Capacity building quantity , the number of personnel and team capacity building is:

[0032] .

[0033] The present invention has the following advantages: the present invention calculates and selects the corresponding nuclear power plant spent fuel assemblies of each receiving pool through the unique receiving conditions of each receiving facility pool, and combines the integer linear programming method to optimize the matching process of spent fuel and container, effectively improving the spent fuel transportation plan formulation and transportation efficiency. This method not only maximizes the utilization of limited container resources and ensures that more spent fuel assemblies can be loaded, but also reduces human errors in the process of spent fuel selection and container matching, saves transportation costs, and significantly enhances economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is the overall calculation flow chart of the present invention;

[0035] Figure 2 A sequence diagram of components that can be received in the present invention;

[0036] Figure 3 It is the transportation volume matching diagram of the present invention;

[0037] Figure 4 A sequence diagram of components that can be loaded according to the present invention;

[0038] Figure 5 It is a container matching diagram of the present invention. DETAILED DESCRIPTION

[0039] The present invention provides a method for calculating spent fuel selection and container matching during spent fuel transportation in a nuclear power plant, including a sequence of components that can be received, transportation volume matching, a sequence of components that can be loaded, container matching, secondary matching, and resource allocation and capacity building. The calculation process of the sequence of components that can be received is as follows:

[0040] The component sequence in the nuclear power plant pool is read in sequence to determine whether the component parameters of the component meet the acceptable component parameters of the first circulation unit receiving facility pool. If so, the component is added to the acceptable component sequence; if not, the parameters of the next component are read and the above judgment process is repeated in sequence until all component sequences are judged. After the judgment is completed, the next unit pool in the circulation unit 2 is transferred to the same judgment until all units in the circulation unit 2 are cycled. At this time, a receivable component sequence that meets the receiving conditions of the circulation unit 1 receiving facility pool is summarized. The receivable component sequence includes all component sequences that meet its receiving conditions in each receivable nuclear power unit of the receiving facility.

[0041] The specific steps for container matching are as follows:

[0042] Step 1: Count the number of components that fit the unit and all types of containers , if the adaptability of a certain type of container Less than its load ,Right now , it means that the container cannot be fully filled when participating in the current transportation task of the unit, so the container type is excluded from participating in the next container combination for the unit components;

[0043] Step 2: Under the condition of limiting the number of container types, use the integer programming algorithm to first calculate the container matching solution that can transport the most components under the combination of multiple different types of containers, and then calculate the container matching solution under the condition of the number of available containers. The matching solution that does not consider the condition of the number of available containers is a pending solution, and can be screened out by human judgment based on whether capacity construction is required and whether it is necessary to build a reasonable solution; the matching solution that considers the condition of the number of available containers is the optimal solution without capacity construction, which can transport the components that can be received to the receiving facilities to the greatest extent;

[0044] Step 3: For each container, calculate the "exclusivity" of each spent fuel assembly that fits the container, and load assemblies with high exclusivity first. Components in the same loading area are loaded in descending order of cooling time;

[0045] Step 4: After loading is completed, compare with the container availability information and determine whether the combination is feasible. If the solution is not feasible due to lack of containers, it can be manually determined whether capacity building is required for the missing containers. If capacity building is not required, the solution is not feasible and the next solution is determined. If it is determined that capacity building is required for the containers, the capacity building needs are recorded and the solution is considered feasible.

[0046] Step 5: determine all container combinations in turn, and finally find the container combination that minimizes the margin and has a reasonable solution combination, which is the container combination required for this unit's transportation task;

[0047] Step 6. After determining the container combination, the container information needs to be updated, the used containers should reduce their annual usage frequency, and the newly added containers should be automatically entered into the system for transportation.

[0048] Furthermore, the specific steps of volume matching are as follows:

[0049] Step 1: If , that is, the total number of the selected outbound component sequences is less than or equal to the maximum receiving capacity of the receiving facility. Without considering the container, this sequence can be fully received by the receiving facility. The volume matching will be directly used as a receiving facility , the number of components of each unit in the receivable component sequence can be counted separately As its export ;

[0050] Step 2: If , that is, the total number of the selected outbound component sequences is greater than the maximum receiving capacity of the receiving facility. Without considering the container, this sequence only has will be received by the receiving facility. The components will be sorted in descending order according to the percentage of water pool capacity used in all units in the second cycle, and the component with the longest cooling time in the unit with the largest current water pool capacity usage ratio will be selected. After the selection is completed, the water pool capacity usage ratio will be recalculated and the above selection process will be repeated. Each selection will be based on the current percentage of water pool capacity used by each unit as the sorting basis until the selection is full. components, at which point the receiving facility's transport capacity matches the The total number of components selected for each unit is used as the unit capacity matching quantity , if any The transport matching amount of each unit is summed up to get the transport matching amount of the receiving facility:

[0051]

[0052] Furthermore, the calculation process of the sequence of components that can be loaded is:

[0053] The above generated sequence of receivable components is screened in turn using the loading parameter conditions of each type of container currently available, and a sequence of loadable components is generated on this basis.

[0054] Furthermore, the specific steps of the secondary matching are as follows:

[0055] Step 1: When all units in the second cycle have been matched with containers, in order to maximize the use of receiving facilities for each transportation task, the component surplus of all units is summed up to obtain ,Sure Is it less than the minimum container "loading capacity"? If so, directly output the solution; if so, sort it again according to the proportion of the unit's pool capacity. This is taken as the “total load” for the unit and is calculated according to the above steps for container matching.

[0056] Furthermore, the specific steps for resource allocation and capacity building are as follows:

[0057] Step 1: For transportation tools, determine all transportation tools in turn. If the annual outbound volume <= Maximum annual loading , then the current transportation resources are sufficient to transport the current task, and there is no need to build capacity; the number of transportation resources required is:

[0058]

[0059] in, is the load capacity of a single transport vehicle, The annual frequency of use of the transport vehicle. If it is not an integer, it will be rounded up and added with one;

[0060] If the annual cargo package transportation volume >Maximum annual loading , then the current transportation resources are insufficient to transport the current task, so capacity building is needed, and the number of transportation resources required = Original transport quantity + Capacity building quantity , the number of transport capacity construction is:

[0061]

[0062] Step 2: For the personnel team, determine all teams in turn. If the annual outbound volume <= Maximum annual cargo handling capacity , the current human resources are sufficient to handle the current tasks, and there is no need for capacity building. The number of personnel teams required is:

[0063]

[0064] in, The processing capacity of a single group of single cargo packages. The annual working frequency of the team. If it is not an integer, it will be rounded up and added by one;

[0065] If the annual export volume >Maximum annual cargo package handling capacity , then the current human resources are insufficient to handle the current tasks, and capacity building is needed. = Original team number + Capacity building quantity , the number of personnel and team capacity building is:

[0066] .

[0067] In this embodiment, the general principle for determining the container combination is: maximize the use of resources and use the container to load as many components as possible. Class container, then in the case of Under the premise of middle is the maximum value, where for The amount of components loaded by the class container, The frequency of use of a container in this transport mission is the condition for whether it can be filled. Containers that are not fully loaded with components cannot participate in this transport mission.

[0068] In this embodiment, the process of volume matching is to determine the number of components received by the receiving facility. The receiving facility receives the number of components To match the volume to the receiving facility, divide it into multiple outbound shipments , each outbound shipment Corresponding nuclear power plant units The number of components to be delivered to the receiving facility is determined by allocating transportation tasks and determining container combinations based on each nuclear power plant unit as the minimum transportation unit.

[0069] In this embodiment, the priority in a nuclear power plant refers to the descending order of the proportion of pool capacity usage from large to small, and the pool transport component with a larger proportion has a higher priority. In a receiving facility, it refers to the priority directly given by an input form when the receiving facility formulates a receiving plan. The input form plans the priority order of the spent fuel assembly based on a combination of initial enrichment, average burnup depth, and minimum cooling time parameter conditions.

[0070] In this embodiment, the first priority refers to the priority that is ranked first in order.

[0071] In this embodiment, the next priority refers to the priority next to the current priority in the order of priority.

[0072] Table 1 is a sequence of components that can be loaded, where M, N, O, and P are different container types, and √ / × indicates whether the loading parameter conditions of this type of container are met. √ means that the component meets the loading parameter conditions of this type of container, which is defined as the component is compatible with the container, otherwise it means it is not compatible.

[0073] Table 1

[0074]

[0075] Although the specific implementation of the present invention is described in detail in conjunction with the drawings, it should not be understood as limiting the scope of protection of this patent. Within the scope described in the claims, various modifications and variations that can be made by those skilled in the art without creative work still fall within the scope of protection of this patent.

Claims

1. A method for calculating spent fuel selection and container matching during spent fuel transportation in a nuclear power plant, including a sequence of components that can be received, transportation volume matching, a sequence of components that can be loaded, container matching, secondary matching, and resource allocation and capacity building, characterized in that: The calculation process of the receivable component sequence is as follows: Read the component sequence in the nuclear power plant pool in turn, determine whether the component parameters of the component meet the acceptable component parameters of the first circulation receiving facility pool, and if so, add the component to the acceptable component sequence; If not, the parameters of the next component are read and the above judgment process is repeated in sequence until all component sequences are judged. After the judgment is completed, the next unit pool in the second cycle is transferred to the same judgment as above until all units in the second cycle are cycled. At this time, a sequence of components that can be received and meet the receiving conditions of the first cycle receiving facility pool will be summarized. The sequence of components that can be received includes all component sequences that meet the receiving conditions of each receivable nuclear power unit of the receiving facility. The specific steps of container matching are as follows: Step 1: Count the number of components that fit the unit and all types of containers , if the number of adaptation components of a certain type of container Less than its load ,Right now , it means that the container cannot be fully filled when participating in the crew's current transportation mission, so this type of container will not participate in subsequent container matching; Step 2: Under the condition of limiting the number of container types, use the integer programming algorithm to first calculate the container matching solution that can transport the most components under the combination of multiple different types of containers, and then calculate the container matching solution under the condition of the number of available containers. Among them, the matching solution that does not consider the condition of the number of available containers is the solution to be confirmed. It can be screened out by human judgment based on whether capacity construction is required and whether it is reasonable. The matching solution that considers the condition of the number of available containers is the optimal solution without capacity construction, which can transport the components that can be received to the receiving facilities to the greatest extent. Step 3: For each container, calculate the "exclusivity" of each spent fuel assembly that fits the container, and load assemblies with high exclusivity first. Components in the same loading area are loaded in descending order of cooling time; Step 4: After loading is completed, compare with the container availability information and determine whether the combination is feasible. If the solution is not feasible due to lack of containers, it can be manually determined whether capacity building is needed for the missing containers. If capacity building is not needed, the solution is not feasible and the next solution is determined. If it is determined that capacity building is needed for the containers, the capacity building needs are recorded and the solution is considered feasible. Step 5: determine all container combinations in turn, and finally find the container combination that minimizes the margin and has a reasonable solution combination, which is the container combination required for the crew's current transportation task; Step 6. After determining the container combination, the container information needs to be updated, the used containers should reduce their annual usage frequency, and the newly added containers should be automatically entered into the system for transportation.

2. The method for calculating spent fuel selection and container matching during spent fuel transportation in a nuclear power plant according to claim 1, characterized in that: The specific steps of the transport volume matching are as follows: Step 1: If , that is, the total number of the selected outbound component sequences is less than or equal to the maximum receiving capacity of the receiving facility. Without considering the container, this sequence can be fully received by the receiving facility. At this time The volume of transportation that will be directly used as a receiving facility , the number of components of each unit in the receivable component sequence can be counted separately As the matching amount of its unit transportation capacity ; Step 2: If , that is, the total number of the selected outbound component sequences is greater than the maximum receiving capacity of the receiving facility. Without considering the container, this sequence only has will be received by the receiving facility. The components will be sorted in descending order according to the percentage of water pool capacity used in all units in the second cycle, and the component with the longest cooling time in the unit with the largest current water pool capacity usage ratio will be selected. After the selection is completed, the water pool capacity usage ratio will be recalculated and the above selection process will be repeated. Each selection will be based on the current percentage of water pool capacity used by each unit as the sorting basis until the selection is full. components, at which point the receiving facility's transport capacity matches the The total number of components selected for each unit is used as the unit capacity matching quantity , if any The transport matching amount of each unit is summed up to get the transport matching amount of the receiving facility: 。 3. The method for calculating spent fuel selection and container matching during spent fuel transportation in a nuclear power plant according to claim 1, characterized in that: The calculation process of the sequence of components that can be loaded is as follows: The generated sequence of receivable components is screened in turn using the loading parameter conditions of each type of container currently available, and a sequence of loadable components is generated on this basis.

4. The method for calculating spent fuel selection and container matching during spent fuel transportation in a nuclear power plant according to claim 1, characterized in that: The specific steps of the secondary matching are as follows: Step 1: When all units in the second cycle have been matched with containers, in order to maximize the use of receiving facilities for each transportation task, the component surplus of all units is summed up to obtain ,Sure Is it less than the minimum container "loading capacity"? If so, directly output the solution; if so, sort it again according to the proportion of the unit pool capacity used. This is taken as the "total load" of the unit and is calculated according to the container matching steps.

5. The method for calculating spent fuel selection and container matching during spent fuel transportation in a nuclear power plant according to claim 1, characterized in that: The specific steps of resource allocation and capacity building are as follows: Step 1: For transportation tools, determine all transportation tools in turn. If the annual outbound volume <= Maximum annual loading , then the current transportation resources are sufficient to transport the current task, and there is no need to build capacity; the number of transportation resources required is: in, is the load capacity of a single transport vehicle, The annual frequency of use of the transport vehicle. If it is not an integer, it will be rounded up and added with one; If the annual export volume > Maximum annual loading , then the current transportation resources are insufficient to transport the current task, so capacity building is needed, and the number of transportation resources required = Original transport quantity + Capacity building quantity , the number of transport capacity construction is: Step 2: For the personnel team, determine all teams in turn. If the annual outbound volume <= Maximum annual cargo package handling capacity , the current human resources are sufficient to handle the current tasks, and there is no need for capacity building. The number of personnel teams required is: in, The processing capacity of a single group of single cargo packages. The annual working frequency of the team. If it is not an integer, it will be rounded up and added by one; If the annual export volume > Maximum annual cargo package handling capacity , then the current human resources are insufficient to handle the current tasks, and capacity building is needed. = Original team number + Capacity building quantity , the number of personnel and team capacity building is: 。

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