Method for calculating heat conduction of eccentric gap when spent fuel storage and transportation container is horizontally placed

Abstract

The invention discloses a method for calculating heat conduction of an eccentric gap when a spent fuel storage and transportation container is horizontally placed, and relates to the technical field of thermal safety analysis of spent fuel storage containers. Comprising the following steps: according to the size of the spent fuel storage and transportation container, calculating gaps between the basket edge and the inner side of a storage and transportation container barrel at different positions and gaps between a spent fuel assembly and a basket fuel pipe when the spent fuel storage and transportation container is horizontally placed; based on the gap, calculating offset rates of the hanging basket at different radial angles relative to centering arrangement and offset rates of the spent fuel assembly at different positions relative to centering arrangement; correcting the effective heat conductivity coefficient of the gap medium based on the offset rate; and carrying out heat conduction calculation by calling the corrected effective heat conduction coefficient of the gap medium. By means of the eccentric gap heat conduction calculation method, when thermal safety analysis of the spent fuel storage and transportation container is carried out, a centering arrangement model can be adopted, and simulation of the heat transfer phenomenon in the eccentric state is achieved by modifying the effective heat conduction coefficients of gap media at different positions under the condition that the model is not changed.

Description

Technical Field

[0001] The present invention relates to the technical field of thermal safety analysis of spent fuel storage containers, and particularly relates to a method for calculating the heat conduction of an eccentric gap when a spent fuel transportation and storage container is placed horizontally. Background Technique

[0002] With the continuous operation of nuclear power plants, the spent fuel pools of nuclear power plants are gradually facing full capacity. In order not to affect the stable operation of nuclear power plants, the spent fuel of nuclear power plants should be removed from the reactor as soon as possible. Before the supporting facilities at the back end of the nuclear fuel cycle are completed, a large amount of spent fuel needs to be stored out of the reactor. Therefore, the transportation and storage of spent fuel have become essential links.

[0003] The structure of the spent fuel transportation container is as Figure 1 shown, and its cross-section is as Figure 2 shown. Considering factors such as assembly during the manufacturing process and the expansion of the basket under the influence of the decay heat of the spent fuel, there are usually certain gaps between the cylinder of the spent fuel transportation and storage container and the basket, and between the spent fuel assembly and the fuel tube of the basket. During the loading process of the spent fuel, the container is in a vertical state, and it can be considered that the cylinder of the transportation container and the basket are coaxial, and the spent fuel assembly and the fuel tube of the basket are coaxial. During the transportation of the spent fuel, the spent fuel transportation container is flipped from a vertical state to a horizontal state, so the spent fuel assembly and the basket are eccentric in position, resulting in direct contact between one side of the spent fuel assembly and the fuel tube of the basket. Refer to Figure 3 shown, the cylindrical surface of the basket contacts the cylindrical surface of the cylinder of the spent fuel transportation container. Refer to Figure 4 shown, which further causes an increase in the gap between the upper side of the spent fuel assembly and the fuel tube of the basket and between the upper part of the basket and the cylinder of the spent fuel transportation container.

[0004] The thermal safety analysis of the spent fuel transportation and storage container is usually realized by the finite element analysis method. According to the analysis experience of the spent fuel transportation container, the gap thermal resistance has a certain influence on the temperature distribution inside the spent fuel transportation container. Therefore, it is necessary to conduct a detailed analysis of the heat transfer performance under different layout conditions. For the eccentric gap structure formed between the above-mentioned cylindrical basket and the inner cylinder of the spent fuel transportation container, the gap sizes at different positions are different, which will result in different gap heat conduction effects at different positions. When using computational fluid dynamics tools to conduct a detailed modeling of the above results, it will increase the complexity of the model, reduce the grid quality, and affect the calculation speed and the accuracy of the calculation results.

[0005] Currently, the existing treatment method for the above problems is to establish different geometric models when placed horizontally and vertically. When placed horizontally, the relative positions of the structures are modified to make the spent fuel assembly directly contact the fuel tube of the basket. The gap between the basket and the container cylinder is ensured by assuming that the basket and the cylinder are in full contact within a certain angle range and there are gaps at other positions to ensure the grid quality, as Figure 5As shown in the figure. Different geometric models are required for the vertical arrangement state and the horizontal arrangement state, which increases the modeling workload. There is a certain difference between the assumption that the hanging basket is in full contact with the cylinder within a certain angle range and the actual situation.

[0006] The existing patent CN111027237A discloses a simulation calculation method for thermal-hydraulic analysis and critical control of a spent fuel storage and transportation container, which performs the following steps: designing the spent fuel storage and transportation container as a cylindrical tank using the theory of elastic-plastic mechanics; analyzing the initial parameters of the cylindrical tank according to the parameters of radiation shielding to obtain the analysis results; performing three-dimensional modeling on the cylindrical tank according to the analysis results to obtain a three-dimensional model; performing finite element analysis on the three-dimensional model to obtain the thermal-hydraulic conditions and critical conditions, and formulating an experimental plan according to the analysis results to improve the cylindrical tank.

[0007] The existing patent CN 116810106A discloses an automatic control system and working method for plasma arc welding of the outer end cover of a spent fuel storage tank with an uneven gap structure, including a three-dimensional motion platform, a programmable logic controller (PLC), a plasma arc welding machine, a plasma arc welding torch, a high-speed wire feeder, a weld tracking laser, an industrial camera, and an industrial control computer. Among them, the plasma arc welding torch, the high-speed wire feeder, the weld tracking laser, and the industrial camera are mounted on the three-dimensional motion platform. The plasma arc welding torch is connected to the plasma arc welding machine, and both the plasma arc welding machine and the high-speed wire feeder are connected to the programmable logic controller. The three-dimensional motion platform, the programmable logic controller, the weld tracking laser, and the industrial camera are all connected to the industrial control computer.

[0008] In summary, the above two existing patents do not solve the problem that when using computational fluid dynamics tools to perform detailed modeling on the thermal-hydraulic safety analysis of spent fuel storage and transportation containers, the model complexity will increase and the grid quality will decrease in the prior art. Summary of the Invention

[0009] Based on the above technical problems, the present invention proposes a method for calculating the eccentric gap heat conduction when a spent fuel storage and transportation container is horizontally placed, which solves the problem that when using computational fluid dynamics tools to perform detailed modeling on the thermal-hydraulic safety analysis of spent fuel storage and transportation containers, the model complexity will increase and the grid quality will decrease in the prior art. The specific technical solutions are as follows:

[0010] A method for calculating the eccentric gap heat conduction when a spent fuel storage and transportation container is horizontally placed, including the following steps:

[0011] S1. Calculate the gap between the edge of the hanging basket and the inner side of the cylinder of the storage and transportation container and the gap between the edge of the spent fuel assembly and the inner side of the fuel tube of the hanging basket when the storage and transportation container is horizontally placed;

[0012] S2. Calculate the offset rate of the hanging basket relative to the centered arrangement and the offset rate of the spent fuel assembly relative to the centered arrangement based on the gap;

[0013] S3. Modify the effective thermal conductivity of the gap medium based on the offset rate;

[0014] S4. Call the modified effective thermal conductivity of the gap medium for heat conduction calculation.

[0015] Further, in step S1, calculate the gap d between the edge of the hanging basket and the inner side of the storage and transportation container cylinder at different positions 1 , and determine the y - coordinate value of the corresponding point on the storage and transportation container cylinder for the gap d 1 ; calculate the gap d between the edge of the spent fuel assembly and the fuel tube of the hanging basket at different positions 2 , and determine the y - coordinate value of the corresponding point on the storage and transportation container cylinder for the gap d 2 .

[0016] Further, in step S1, establish a corresponding table of the y - coordinate value, the gap d 1 and the gap d 2 , and perform interpolation calculation through an interpolation function to obtain the gap d corresponding to any y - coordinate value 1 and the gap d 2 .

[0017] Further, in step S1, the calculation formula for the gap d 1 is

[0018] d 1 =R - L

[0019] where R is the inner cavity diameter of the storage and transportation container cylinder, and L is the distance from the edge of the hanging basket to the center of the storage and transportation container cylinder;

[0020] The calculation formula for the gap d 2 is

[0021] d 2 =|L 燃料管(x,y,z) -L 组件(x,y,z) |

[0022] where L 燃料管(x,y,z) is the coordinate of the fuel tube at different positions, and L 组件(x,y,z) is the coordinate of the edge of the spent fuel assembly at the corresponding position.

[0023] Further, in step S2, calculate the offset rate of the hanging basket relative to the centered arrangement based on the gap d 1 , and the offset rate of the hanging basket relative to the centered arrangement has a linear relationship with the gap d 1 ; calculate the offset rate of the spent fuel assembly relative to the centered arrangement based on the gap d 2 , and the offset rate of the spent fuel assembly relative to the centered arrangement has a linear relationship with the gap d 2Show a linear relationship;

[0024] Furthermore, the calculation formula for the offset rate of the hanging basket relative to the centered arrangement is

[0025]

[0026] where r is the outer radius of the hanging basket;

[0027] The calculation formula for the offset rate of the spent fuel assembly relative to the centered arrangement is

[0028]

[0029] where L 燃料管 is the internal width of the fuel tube of the hanging basket; L 组件 is the external width of the spent fuel assembly in the cross-sectional direction.

[0030] Furthermore, in step S3, the effective thermal conductivity of the gap medium between the hanging basket and the inner wall of the storage and transportation container is corrected using the offset rate of the hanging basket relative to the centered arrangement, and the effective thermal conductivity of the gap medium between the spent fuel assembly and the fuel tube of the hanging basket is corrected using the offset rate of the spent fuel assembly relative to the centered arrangement. The effective thermal conductivity of the gap medium shows a linear relationship with the corresponding offset rate.

[0031] Furthermore, the correction calculation formula for the effective thermal conductivity of the gap medium is

[0032] K eff = K 气体 ·Ratio

[0033] where K 气体 is the gas thermal conductivity, and Ratio is Ratio 1 or Ratio 2 ;

[0034] The effective thermal conductivity K eff_bottom at the bottom contact position between the hanging basket and the inner wall of the storage and transportation container, and between the spent fuel assembly and the fuel tube of the hanging basket is 气体 = a·K

[0035] where a ranges from 100 to 1000. eff Furthermore, in step S4, the thermal conductivity of the material model used in the eccentric gap calculation domain formed by the hanging basket and the inner wall of the storage and transportation container, and each spent fuel assembly and the fuel tube of the hanging basket is set to the effective thermal conductivity K eff_bottom of the gap medium, and the thermal conductivity of the material model in the bottom calculation domain where contact occurs is set to the effective thermal conductivity K

[0036] The present invention also provides a computer program product, comprising a computer program, characterized in that when the computer program is executed by a processor, it implements the steps of the method for calculating the heat conduction of the eccentric gap when the spent fuel storage and transportation container is placed horizontally as described in any one of claims 1 to 9.

[0037] Based on the above technical solutions, compared with the prior art, the present invention has at least the following beneficial effects:

[0038] 1. For the method for calculating the heat conduction of the eccentric gap when the spent fuel storage and transportation container is placed horizontally provided by the present invention, when conducting the thermal-hydraulic safety analysis of the spent fuel storage and transportation container, the same set of geometric models can be used for both the vertical and horizontal arrangement states, thereby reducing the modeling workload and simplifying the calculation model.

[0039] 2. For the method for calculating the heat conduction of the eccentric gap when the spent fuel storage and transportation container is placed horizontally provided by the present invention, when conducting the thermal-hydraulic safety analysis of the spent fuel storage and transportation container, without changing the model, the simulation of the heat transfer phenomenon in the eccentric state can be achieved by modifying the effective thermal conductivity at different positions.

[0040] 3. For the method for calculating the heat conduction of the eccentric gap when the spent fuel storage and transportation container is placed horizontally provided by the present invention, on the premise of ensuring accuracy, the calculation speed and calculation accuracy are significantly improved.

[0041] 4. For the method for calculating the heat conduction of the eccentric gap when the spent fuel storage and transportation container is placed horizontally provided by the present invention, the heat conduction of the eccentric gap can be accurately calculated, and the temperature distribution of the spent fuel assembly can be predicted more accurately. Based on the present invention, the design of the cooling system of the spent fuel assembly storage and transportation container can be optimized, which is beneficial to improving the cooling efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] The accompanying drawings forming a part of the present invention are used to provide a further understanding of the present invention. The schematic embodiments and descriptions thereof of the present invention are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0043] Figure 1 is a schematic structural view of the spent fuel storage and transportation container in the present invention;

[0044] Figure 2 is a schematic cross-sectional view of the spent fuel storage and transportation container in the present invention;

[0045] Figure 3 is a schematic structural view of the eccentric gap formed between the spent fuel assembly and the fuel basket tube of the spent fuel storage and transportation container in the present invention;

[0046] Figure 4 is a schematic structural view of the eccentric gap formed between the fuel basket and the container cylinder of the spent fuel storage and transportation container in the present invention;

[0047] Figure 5 It is a schematic structural diagram for avoiding the existence of poor meshes by modifying geometric methods in the prior art;

[0048] Figure 6 It is a schematic flow diagram of a calculation method for the heat conduction of the eccentric clearance when the spent fuel storage and transportation container is horizontal proposed by the present invention;

[0049] Figure 7 It is a schematic diagram of the eccentric gap width when the spent fuel storage and transportation container is horizontally placed in the embodiment of the present invention;

[0050] Figure 8 It is a schematic structural diagram of a computer system provided by the present invention;

[0051] Figure 9 It is an electronic device provided by the present invention.

[0052] Reference numerals: 101 - container lid; 201 - outer container cylinder; 301 - inner container cylinder; 401 - spent fuel assembly; 501 - basket; 601 - clearance between the basket and the inner container cylinder; 801 - central processing unit; 802 - read-only memory; 803 - random access memory; 804 - bus; 805 - input / output interface; 806 - input part; 807 - output part; 808 - storage part; 809 - communication part; 810 - driver; 811 - removable medium; 902 - memory; 904 - processor; 906 - transmission device; 908 - display; 910 - connection bus. Detailed implementation manners

[0053] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the drawings and in conjunction with the embodiments.

[0054] The following further describes the present invention in detail with specific embodiments, and these embodiments should not be construed as limiting the scope claimed by the present invention.

[0055] To solve the problem that when using computational fluid dynamics tools to perform detailed modeling on the thermal-hydraulic safety analysis of spent fuel storage and transportation containers in the prior art, the model complexity will increase and the mesh quality will decrease, the present invention proposes a calculation method for the heat conduction of the eccentric clearance when the spent fuel storage and transportation container is horizontally placed.

[0056] The following describes the present application with reference to the embodiments:

[0057] According to one aspect of the embodiments of the present application, a method for calculating the eccentric gap heat conduction when the spent fuel storage and transportation container is placed horizontally is proposed. When conducting the thermal-hydraulic safety analysis of the spent fuel storage and transportation container, the same set of geometric models can be used for both the vertical state and the horizontal state. Without changing the geometric structure, the simulation of the heat transfer phenomenon in the eccentric state can be achieved by modifying the effective thermal conductivity at different positions, thereby reducing the modeling workload and simplifying the calculation model, and significantly improving the calculation speed and accuracy on the premise of ensuring accuracy.

[0058] Referring to Figure 6 as shown, the method for calculating the eccentric gap heat conduction when the spent fuel storage and transportation container is placed horizontally specifically includes the following steps:

[0059] S1. Calculate the gaps between the edge of the basket and the inner side of the storage and transportation container and the gaps between the spent fuel assembly and the inner side of the fuel tube of the basket at different positions when the spent fuel storage and transportation container is placed horizontally;

[0060] S2. Based on the gaps, calculate the offset rates of the basket and the spent fuel assembly relative to the centered arrangement at different radial angles;

[0061] S3. Modify the effective thermal conductivity of the gap medium based on the offset rates;

[0062] S4. Call the modified effective thermal conductivity of the gap medium in the computational fluid dynamics program for calculation.

[0063] Specifically, step S1 in the above-mentioned method for calculating eccentric gap heat conduction specifically includes:

[0064] Calculate the gap d between the edge of the basket and the inner side of the storage and transportation container at different radial angle directions of the storage and transportation container when the spent fuel storage and transportation container is placed horizontally 1 and the gap d between the spent fuel assembly and the inner side of the fuel tube of the basket 2 .

[0065] Referring to Figure 7 as shown, it is a schematic diagram of the eccentric gap width at different positions when the spent fuel storage and transportation container is placed horizontally. The calculation formula for the gap d between the edge of the basket and the inner side of the storage and transportation container 1 is

[0066] d 1 = R - L

[0067] where R is the inner cavity radius of the storage and transportation container, and L is the distance between the edge of the basket and the center of the storage and transportation container cylinder at the corresponding radial angle.

[0068] The calculation formula for the distance L between the edge of the basket and the center of the storage and transportation container cylinder at the corresponding radial angle is

[0069] L = e 2 ​+r 2 -2·e·r·sinα

[0070] Among them, r is the outer edge radius of the hanging basket, α is the radial angle, and e is the offset height of the axis when the storage and transportation container is placed horizontally, that is, the offset height of the axis of the hanging basket relative to the axis of the container cylinder body.

[0071] The gap d between the spent fuel assembly and the inner side of the fuel tube 2 The calculation formula is

[0072] d 2 =|L 燃料管(x,y,z) -L 组件(x,y,z) |

[0073] Among them, L 燃料管(x,y,z) is the coordinate of the fuel tube at different positions, and L 组件(x,y,z) is the coordinate of the spent fuel assembly at the corresponding position.

[0074] The y coordinate values at different positions in the inner cavity of the storage and transportation container cylinder body (i.e., the P' point in Figure 7 ) are listed in a table corresponding to the gap d 1 and the gap d 2 .

[0075] Specifically, step S2 in the above eccentric gap heat conduction calculation method specifically includes:

[0076] Based on the gap d calculated in step S1 1 and the gap d 2 , the offset ratios Ratio 1 of the hanging basket relative to the centered arrangement (i.e., the hanging basket is coaxial with the spent fuel storage and transportation container cylinder body) and the offset ratio Ratio 2 of the spent fuel assembly relative to the centered arrangement are calculated respectively.

[0077] The offset ratio Ratio 1 of the hanging basket relative to the centered arrangement has the calculation formula

[0078]

[0079] Among them, R is the inner cavity radius of the storage and transportation container cylinder body, and r is the outer edge radius of the hanging basket.

[0080] Refer to Figure 3 as shown, the offset ratio Ratio 2 of the spent fuel assembly relative to the centered arrangement has the calculation formula

[0081]

[0082] Among them, L 燃料管 is the internal width of the fuel tube of the hanging basket; L组件 is the external width in the cross-sectional direction of the spent fuel assembly.

[0083] Specifically, step S3 in the above eccentric gap heat conduction calculation method specifically includes:

[0084] Based on the offset ratio Ratio in step S2 1 Correct the effective thermal conductivity of the gap medium between the basket and the storage and transportation container cylinder, based on the offset ratio Ratio 2 Correct the effective thermal conductivity of the gap medium between the spent fuel assembly and the fuel tube of the basket. The calculation formula for correcting the effective thermal conductivity of the gap medium is

[0085] K eff = K 气体 ·Ratio

[0086] where, K 气体 is the gas thermal conductivity, and Ratio is Ratio 1 or Ratio 2 .

[0087] Meanwhile, for the bottom contact positions of the basket and the storage and transportation container cylinder and the bottom contact positions of the spent fuel assembly and the fuel tube of the basket, the bottom effective thermal conductivity K eff_bottom is a relatively large value. In order to be used for simulation of contact, the bottom effective thermal conductivity is

[0088] K eff_bottom = a·K 气体 ;

[0089] where, the value of a ranges from 100 to 1000.

[0090] Specifically, step S4 in the above eccentric gap heat conduction calculation method specifically includes:

[0091] Use the corrected effective thermal conductivity of the gap medium in step S3 to conduct thermal-hydraulic safety analysis of the spent fuel storage and transportation container.

[0092] In the computational fluid dynamics program, an interpolation function, an offset ratio function, and an effective thermal conductivity function are defined. Among them, the defined interpolation function f(d) interpolates the table of the y coordinate value and the gap d 1 and the gap d 2 in step S1 to obtain the gap d 1 and the gap d 2 corresponding to any y coordinate on the storage and transportation container; the offset ratio function is based on the interpolation function, specifically and The effective thermal conductivity function of the gap medium is based on the offset ratio function, specifically f(K eff ) = K 气体·f(Ratio), where the bottom effective thermal conductivity function at the bottom position where contact occurs is f(K eff _bottom) = a·K 气体 .

[0093] In the computational fluid dynamics program, the material thermal conductivity of the material model used in the eccentric clearance calculation domain is set to the effective thermal conductivity function f(K eff ) of the clearance medium, where the thermal conductivity of the material model in the bottom calculation domain where contact occurs is set to the bottom effective thermal conductivity function f(K eff _bottom).

[0094] Through the above calculation method provided by this embodiment, when conducting thermal-hydraulic safety analysis of spent fuel storage and transportation containers, the same set of geometric models can be used for vertical and horizontal arrangements. Without changing the geometric structure, the simulation of heat transfer phenomena in the eccentric state can be achieved by modifying the effective thermal conductivities at different positions, thereby reducing the modeling workload and simplifying the calculation model. On the premise of ensuring accuracy, the calculation speed and calculation accuracy are significantly improved.

[0095] According to one aspect of the present application, a computer program product is provided, and the computer program product includes a computer program.

[0096] Figure 8 Schematically shows a block diagram of a computer system of an electronic device for implementing this embodiment.

[0097] It should be noted that Figure 8 The computer system 800 of the electronic device shown is only an example and should not impose any limitations on the functions and usage scope of the embodiments of the present application.

[0098] As Figure 8 shown, the computer system 800 includes a central processing unit 801 (Central Processing Unit, CPU), which can perform various appropriate actions and processes according to the program stored in the read-only memory 802 (Read-Only Memory, ROM) or the program loaded from the storage section 808 into the random access memory 803 (Random Access Memory, RAM). In the random access memory 803, various programs and data required for system operation are also stored. The central processing unit 801, the read-only memory 802, and the random access memory 803 are connected to each other through a bus 804. The input / output interface 1105 (Input / Output interface, that is, I / O interface) is also connected to the bus 804.

[0099] The following components are connected to the input / output interface 805: an input section 806 including a keyboard, a mouse, etc.; an output section 807 including a cathode ray tube (CRT), a liquid crystal display (LCD), etc. and a speaker, etc.; a storage section 808 including a hard disk, etc.; and a communication section 809 including a network interface card such as a local area network card, a modem, etc. The communication section 1109 performs communication processing via a network such as the Internet. A drive 810 is also connected to the input / output interface 805 as required. A removable medium 811, such as a magnetic disk, an optical disk, a magneto-optical disk, a semiconductor memory, etc., is installed on the drive 810 as required so that a computer program read from it can be installed into the storage section 808 as required.

[0100] Specifically, according to an embodiment of the present application, the processes described in each method flowchart can be implemented as a computer software program. For example, an embodiment of the present application includes a computer program product, which includes a computer program carried on a computer-readable medium, and the computer program includes program codes for executing the methods shown in the flowcharts. In such an embodiment, the computer program can be downloaded and installed from the network through the communication section 809, and / or installed from the removable medium 811. When the computer program is executed by the central processing unit 801, various functions defined in the system of the present application are executed.

[0101] In such an embodiment, the computer program can be downloaded and installed from the network through the communication section 809, and / or installed from the removable medium 811. When the computer program is executed by the central processing unit 801, various functions provided by the embodiments of the present application are executed.

[0102] According to another aspect of the embodiments of the present application, an electronic device for implementing the above-mentioned calculation method of the eccentric clearance heat conduction when the spent fuel storage and transportation container is placed horizontally is further provided. In this embodiment, the electronic device is taken as an example of a terminal device for illustration. As Figure 9 shown, the electronic device includes a memory 902 and a processor 904. A computer program is stored in the memory 902, and the processor 904 is configured to execute the steps in any one of the above method embodiments through the computer program.

[0103] Optionally, in this embodiment, the above-mentioned electronic device can be at least one network device among multiple network devices in a computer network.

[0104] Optionally, in this embodiment, the above-mentioned processor can be configured to execute the methods in the embodiments of the present application through a computer program.

[0105] Optionally, those of ordinary skill in the art can understand that Figure 9 the structure shown is only schematic, Figure 9 and it does not limit the structure of the above-mentioned electronic device. For example, the electronic device may further include more or fewer components (such as a network interface, etc.) than those shown Figure 9 in the figure, or have a different configuration from that shown Figure 9 in the figure.

[0106] Among them, the memory 902 can be used to store software programs and modules, such as the program corresponding to the method for calculating the eccentric clearance heat conduction when the spent fuel storage and transportation container is placed horizontally in Embodiment 1 of the present application. The processor 904 executes various functional applications and data processing by running the software program stored in the memory 902, that is, implements the above-mentioned method for calculating the eccentric clearance heat conduction when the spent fuel storage and transportation container is placed horizontally. The memory 902 may include a high-speed random access memory, and may also include a non-volatile memory, such as one or more magnetic storage devices, flash memories, or other non-volatile solid-state memories. In some instances, the memory 902 may further include a memory remotely disposed relative to the processor 904, and these remote memories may be connected to the terminal through a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an enterprise intranet, a local area network, a mobile communication network, and combinations thereof.

[0107] Optionally, the above-mentioned transmission device 906 is used to receive or send data via a network. Specific examples of the above-mentioned network may include a wired network and a wireless network. In one instance, the transmission device 906 includes a network adapter (Network Interface Controller, NIC), which can be connected to other network devices and routers through a network cable, so as to communicate with the Internet or a local area network. In one instance, the transmission device 906 is a radio frequency (RF) module, which is used to communicate with the Internet wirelessly.

[0108] In addition, the above-mentioned electronic device further includes: a display 908 and a connection bus 910.

[0109] In other embodiments, the above-mentioned terminal device or server may be a node in a distributed system, where the distributed system may be a blockchain system, and the blockchain system may be a distributed system formed by connecting the multiple nodes through network communication. Among them, the nodes can form a peer-to-peer network, and any form of computing device, such as a server, a terminal, and other electronic devices, can become a node in the blockchain system by joining the peer-to-peer network.

[0110] According to another aspect of the present application, a computer-readable storage medium is provided. The processor of the electronic device reads the computer instructions from the computer-readable storage medium, and the processor executes the computer instructions, so that the electronic device executes the above-mentioned eccentric clearance heat conduction calculation method when the spent fuel storage and transportation container is placed horizontally.

[0111] Optionally, in this embodiment, the above computer-readable storage medium may be configured to store the methods for executing the embodiments of the present application.

[0112] Optionally, in this embodiment, those of ordinary skill in the art can understand that all or part of the steps in the various methods of the above embodiments can be completed by a program instructing the relevant hardware of the terminal device. The program can be stored in a computer-readable storage medium, and the storage medium may include: a flash drive, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disc, etc.

[0113] The serial numbers of the above embodiments of the present application are only for description and do not represent the advantages or disadvantages of the embodiments.

[0114] If the integrated unit in the above embodiments is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in the above computer-readable storage medium. Based on this understanding, the technical solution of the present application, in essence, or the part that contributes to the prior art, or all or part of this technical solution, can be embodied in the form of a software product. The computer software product is stored in the storage medium and includes several instructions for causing one or more electronic devices to execute all or part of the steps of the methods described in the various embodiments of the present application.

[0115] In the above embodiments of the present application, the descriptions of the various embodiments have their own emphases. For the parts not detailed in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0116] In several embodiments provided by the present application, it should be understood that the disclosed application program can be implemented in other ways. Among them, the device embodiments described above are only illustrative. For example, the division of the units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed mutual coupling or direct coupling or communication connection can be through some interfaces, and the indirect coupling or communication connection of the units or modules can be in an electrical or other form.

[0117] The unit described as a separation component may or may not be physically separated. The component shown as a unit may or may not be a physical unit, that is, it may be located in one place or distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0118] In addition, each functional unit in various embodiments of the present application can be integrated into a processing unit, or each unit can exist physically alone, or two or more units can be integrated into one unit. The above integrated unit can be implemented in the form of hardware or in the form of a software functional unit.

[0119] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

[0120] In summary, from the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

[0121] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover a non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the existence of additional identical elements in the process, method, article or device comprising the element.

[0122] It should be noted that in the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without conflict, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

Claims

1. A method for calculating heat conduction of eccentric gap when a spent fuel storage and transportation container is placed horizontally, characterized in that: The following steps are involved: S1. Calculate the gap between the edge of the hanging basket and the inner side of the storage and transportation container cylinder when the storage and transportation container is placed horizontally, and the gap between the edge of the spent fuel assembly and the inner side of the hanging basket fuel pipe; S2. Calculating the deviation rate of the hanging basket relative to the centered arrangement and the deviation rate of the spent fuel assembly relative to the centered arrangement based on the gap; S3, correcting the effective thermal conductivity of the gap medium based on the deviation rate; S4. Call the corrected effective thermal conductivity of the gap medium to perform heat conduction calculation.

2. The method for calculating heat conduction of eccentric gap when the spent fuel storage and transportation container is placed horizontally according to claim 1, characterized in that: In step S1, the gap d1 between the edge of the hanging basket and the inner side of the storage and transportation container cylinder at different positions is calculated, and the y coordinate value of the gap d1 and the corresponding point on the storage and transportation container cylinder is determined; the gap d2 between the edge of the spent fuel assembly at different positions and the hanging basket fuel pipe is calculated, and the y coordinate value of the gap d2 and the corresponding point on the storage and transportation container cylinder is determined.

3. The method for calculating heat conduction of eccentric gap when the spent fuel storage and transportation container is placed horizontally according to claim 2, characterized in that: In step S1, a corresponding table between the y-coordinate value and the gap d1 and the gap d2 is established, and an interpolation calculation is performed through an interpolation function to obtain the gap d1 and the gap d2 corresponding to any y-coordinate value.

4. The method for calculating heat conduction of eccentric gap when the spent fuel storage and transportation container is placed horizontally according to claim 3, characterized in that: In step S1, the calculation formula of the gap d1 is: d1=RL Among them, R is the inner diameter of the storage and transportation container cylinder, and L is the distance from the edge of the hanging basket to the center of the storage and transportation container cylinder; The calculation formula of the gap d2 is: <h2 style=";text-align:left;direction:ltr">d2 = L<h2 style=";text-align:left;direction:ltr"> 燃料管(x,y,z) <h2 style=";text-align:left;direction:ltr"> -L<h2 style=";text-align:left;direction:ltr"> 组件(x,y,z) <h2 style=";text-align:left;direction:ltr"> | Among them, L 燃料管(x,y,z) is the coordinate of the fuel pipe at different positions, L 组件(x,y,z) are the coordinates of the edge of the spent fuel assembly at the corresponding position.

5. The method for calculating heat conduction of eccentric gap when the spent fuel storage and transportation container is placed horizontally according to claim 2, characterized in that: In step S2, the deviation rate of the hanging basket relative to the centered arrangement is calculated based on the gap d1, and the deviation rate of the hanging basket relative to the centered arrangement is linearly related to the gap d1; The deviation rate of the spent fuel assembly relative to the centered arrangement is calculated based on the gap d2, and the deviation rate of the spent fuel assembly relative to the centered arrangement is linearly related to the gap d2.

6. The method for calculating heat conduction of eccentric gap when the spent fuel storage and transportation container is placed horizontally according to claim 5, characterized in that: The calculation formula of the deviation rate of the hanging basket relative to the central arrangement is: Among them, r is the outer radius of the hanging basket; The calculation formula for the deviation rate of the spent fuel assembly relative to the centered arrangement is: Among them, L 燃料管 L is the internal width of the fuel pipe in the basket; 组件 It is the external width of the spent fuel assembly in the cross-section direction.

7. The method for calculating heat conduction of eccentric gap when the spent fuel storage and transportation container is placed horizontally according to claim 6, characterized in that: In step S3, the effective thermal conductivity of the gap medium between the hanging basket and the cylinder of the storage and transportation container is corrected by using the deviation rate of the hanging basket relative to the centered arrangement, and the effective thermal conductivity of the gap medium between the spent fuel assembly and the hanging basket fuel pipe is corrected by using the deviation rate of the spent fuel assembly relative to the centered arrangement, and the effective thermal conductivity of the gap medium is linearly related to the corresponding deviation rate.

8. The method for calculating heat conduction of eccentric gap when the spent fuel storage and transportation container is placed horizontally according to claim 7, characterized in that: The modified calculation formula for the effective thermal conductivity of the gap medium is: K eff =K 气体 ·Ratio Among them, K 气体 is the thermal conductivity of gas, Ratio is Ratio1 or Ratio2; The bottom effective thermal conductivity K of the bottom contact position between the hanging basket and the storage and transportation container cylinder and between the spent fuel assembly and the hanging basket fuel pipe eff_bottom =a·K 气体 , where a ranges from 100 to 1000.

9. The method for calculating heat conduction of eccentric gap when the spent fuel storage and transportation container is placed horizontally according to claim 8, characterized in that: In step S4, the thermal conductivity of the material model used in the calculation domain of the eccentric gap formed by the hanging basket and the storage container cylinder, and each spent fuel assembly and the hanging basket fuel pipe is set to the effective thermal conductivity K of the gap medium. eff , where the thermal conductivity of the material model in the bottom computational domain where contact occurs is set to the bottom effective thermal conductivity K eff_bottom .

10. A computer program product, comprising a computer program, characterized in that When the computer program is executed by a processor, the steps of the method for calculating eccentric gap heat conduction when the spent fuel storage and transportation container is placed horizontally are implemented according to any one of claims 1 to 9.

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