Integrated splicable fuel element

Abstract

The invention relates to the field of nuclear reactor fuel elements, in particular to an integrated splicable fuel element which comprises base bodies and fuel bodies arranged in the base bodies, each base body is internally provided with at least one fuel body, the multiple fuel bodies are evenly distributed in the base bodies, the base bodies are provided with multiple connecting structures, and the connecting structures are arranged on the base bodies. The multiple base bodies can be spliced in the longitudinal direction and the transverse direction through the connecting structures. The fuel element has the advantages that in order to eliminate negative effects caused by the fact that a clamping system needs to be introduced into a rod-shaped structure, the application scene of the fuel element is expanded to meet the requirement of a solid reactor core.

Description

Technical Field

[0001] The present application relates to the field of nuclear reactor fuel elements, and in particular to an integrated splicable fuel element. Background Art

[0002] Nuclear fuel elements are the smallest structurally independent components in a reactor with nuclear fuel as the main component. They generally refer to fuel-using units with independent structures in nuclear reactors. Nuclear fuel elements range from single cylindrical short rods to large assemblies with complex structures. They usually refer to fuel units composed of fuel cores and cladding, such as fuel rods, fuel plates and fuel balls. Currently, there are also fuel rods with fuel particles dispersed in a rod-shaped metal matrix. Nuclear fuel elements are the final product of the nuclear fuel industry, the energy source of nuclear power plants, and the core components of nuclear reactors. Both types of fuel elements require the addition of a clamping system in the fuel assembly to achieve the positioning of the fuel elements in the stack, and the general application scenario is a pressurized water reactor.

[0003] Pressurized water reactors use light water as coolant and moderator. In the reactor core, the nuclear fuel undergoes a chain fission reaction, releasing a large amount of heat energy, which is carried away by the high-pressure water flowing through the core. The water pressure remains unchanged during the heating process, so it is called "pressurized water"; the heated high-pressure water passes through the steam generator, transfers heat to the water in the secondary circuit, and generates steam. The steam drives the turbine to rotate, which in turn drives the generator to generate electricity. The introduction of the clamping system will bring the risk of component damage and failure during the operation of the reactor, and bring foreign matter to the core. At the same time, there is water-induced vibration abrasion and foreign matter abrasion between the clamping system and the fuel rods, which is the main reason for the damage of fuel rods in pressurized water reactors. Summary of the invention

[0004] In order to eliminate the negative impact brought about by the need to introduce a clamping system for the rod-like structure and expand the application scenarios of the fuel elements to adapt to the needs of the solid-state core, the present application provides an integrated splicable fuel element.

[0005] The integrated splicable fuel element provided in this application adopts the following technical solution:

[0006] The one-piece splicable fuel element comprises: a substrate and a fuel body arranged in the substrate, each substrate is provided with at least one fuel body, the substrate is provided with a plurality of connection structures, and a plurality of substrates can be spliced ​​through the connection structures.

[0007] By adopting the above technical solution, since multiple substrates can be spliced ​​through the connection structure, during the installation of the nuclear reactor, the fuel elements can be flexibly combined according to actual needs to adapt to different reactor designs and space requirements, making the installation more convenient and reducing the installation time and labor costs; when a fuel element fails or needs to be replaced, the element can be removed separately without affecting the normal operation of other elements. By splicing the connection structure, the replacement and maintenance process is simpler and more efficient, reducing the maintenance cost;

[0008] The integrated type makes the fuel body and the matrix tightly combined, reducing the movement and vibration of the fuel body during operation. After multiple matrixes are spliced ​​through the connecting structure, an integral structure is formed, which further enhances the stability of the fuel element and reduces the safety risks caused by structural looseness. After multiple matrixes are spliced, the heat dissipation area is increased, the heat dissipation efficiency is improved, the temperature of the fuel element during operation is controlled within a safe range, the service life is extended, the leakage points are reduced, the sealing performance is improved, and the radiation hazards to the environment and personnel are reduced.

[0009] Preferably, the base includes a column body and a column base, and the column body and the column base are both provided with a connecting structure, the column base is spliced ​​with the column base of the adjacent base through the connecting structure, and the column body is spliced ​​with the column body of the adjacent base through the connecting structure.

[0010] By adopting the above technical solution, different reactor sizes can be flexibly adapted: the length can be spliced ​​by the connection structure on the bottom of the column, and the overall length of the fuel element can be flexibly adjusted according to the design requirements of different nuclear reactors. The connection structure on the column body can realize a combination of various shapes to meet the geometric requirements of various types of nuclear reactors. Reactors with special shapes can also achieve the best fuel layout by reasonably combining the matrix, thereby improving the versatility of the fuel elements.

[0011] During the installation process, the fuel elements are gradually spliced ​​according to the actual space and operating conditions to reduce the difficulty of installation. When maintenance or replacement of some elements is required, the matrix of a specific length can be disassembled and spliced ​​in a targeted manner to improve maintenance efficiency. Splicing enables the fuel elements to better adapt to the complex spatial layout inside the reactor, make full use of limited space, and improve the power density and operating efficiency of the reactor. Through the combination of different shapes, the distribution of fuel in the reactor can be more flexibly adjusted, making the power output of the fuel more uniform, reducing the generation of local hot spots, and improving the safety and stability of the reactor.

[0012] Preferably, a fuel body is provided in the substrate, the fuel body is cylindrical and arranged at the center of the substrate; or

[0013] Two or more fuel bodies are arranged in the base, and the fuel bodies are evenly arranged in the base.

[0014] By adopting the above technical solution, when a fuel body is provided in the matrix, placing the fuel body in the center of the matrix can enable the matrix to provide a relatively uniform support force for the fuel body in all directions, thereby enhancing the ability to withstand internal pressure and external impact and improving structural stability during the operation of the nuclear reactor. When the fuel body is in the center, the heat generated by the fuel body can be more evenly conducted to the surroundings of the matrix, thereby improving heat dissipation efficiency, avoiding local overheating, and extending the service life of the fuel element.

[0015] When two or more fuel bodies are provided in the matrix and are evenly arranged in the matrix, the setting of multiple fuel bodies increases the fuel loading capacity, thereby improving the power output of the nuclear reactor. The evenly distributed fuel bodies can make the nuclear reaction more evenly carried out in the matrix, avoiding the generation of hot spots due to excessive local reactions, thereby improving the safety and stability of the reactor. The design of multiple fuel bodies also increases the redundancy of the system. If one of the fuel bodies fails, the other fuel bodies can continue to work, reducing the risk of reactor shutdown due to the failure of a single fuel body.

[0016] Preferably, the fuel body comprises a fuel shell and fuel, the fuel is filled in the fuel shell, and the fuel shell is a column or a sphere.

[0017] By adopting the above technical solution, the columnar body has a regular shape and clear geometric dimensions, and is easier to achieve a stable arrangement in the matrix. It can match the shape of the matrix, making the overall structure of the fuel element more compact and stable. The side of the columnar body can provide uniform support for the fuel, reduce the movement and shaking of the fuel inside, and reduce the safety risks caused by the displacement of the fuel.

[0018] The sphere is relatively stable. During the operation of the nuclear reactor, the external pressure on the fuel shell and the expansion force of the internal fuel can be evenly distributed on the spherical surface, reducing stress concentration and the risk of shell rupture. The shape of the sphere makes the fuel shell have better seismic resistance when subjected to impact or vibration, thereby improving the reliability of the fuel elements.

[0019] Preferably, the connection structure includes a connection groove and a connection rib, the column body includes a plurality of column surfaces, each column surface is provided with a connection groove and / or a connection rib, or

[0020] The connecting grooves and the connecting ribs are alternately arranged along the circumference of the column body.

[0021] By adopting the above technical solution, when the connection grooves and the connection ribs are arranged in sequence, a mutually interlocking structure can be formed during splicing, thereby increasing the tightness and stability of the connection between the substrates, ensuring that the overall structure of the fuel element is firm. During the installation process, the operator can simply insert the connection rib of one substrate into the connection groove of another substrate to achieve rapid splicing and improve installation efficiency.

[0022] When the connecting grooves and the connecting ribs are alternately arranged on every two adjacent cylindrical surfaces of the column body, the alternately distributed connecting grooves and the connecting ribs can share the load together, so that any two bases can be spliced ​​and installed through the structure, thereby improving the installation efficiency and meeting the installation requirements.

[0023] Preferably, the connecting groove is opened at the midline of the column body, or

[0024] The connection grooves are evenly arranged with the center line of the column body as a symmetry line.

[0025] By adopting the above technical solution, when the connecting groove is opened at the center line of the column body, the structure of the spliced ​​matrix ensures that the force and stress borne by each matrix during the operation of the nuclear reactor are more evenly distributed, thereby improving the stability of the overall structure. The connecting groove at the center line can be used as a clear positioning mark during splicing, so that the operator can align and splice multiple matrixes more accurately, improve the accuracy and efficiency of installation, reduce installation errors, and at the same time, ensure that the connecting rib can be smoothly inserted into the connecting groove to achieve a tight connection;

[0026] When the connection grooves are evenly arranged with the center line of the column as the symmetry line, multiple evenly arranged connection grooves increase the connection points between the substrates. More connection points can disperse stress, reduce the burden on a single connection part, and reduce the risk of connection failure. Increasing the connection points can also enable the fuel elements to better maintain structural integrity when subjected to external impact or vibration, thereby improving their seismic resistance.

[0027] Preferably, two column bases are arranged opposite to each other, one of the column bases is provided with a mounting protrusion, and the other column base is provided with a mounting groove for the mounting protrusion to be embedded in.

[0028] By adopting the above technical solution, when installing the fuel element, by embedding the installation protrusion of one column bottom into the installation groove of another column bottom, rapid positioning and connection can be achieved, which is simple and fast, and improves the installation efficiency. The cooperation of the installation protrusion and the installation groove can ensure that the two column bottoms can be accurately aligned when spliced, avoiding misalignment or offset, and ensuring the overall structural stability of the fuel element;

[0029] When the fuel element needs to be maintained or replaced, the design of the mounting protrusion and the mounting groove makes the disassembly process easier. The two column bottoms can be separated by simply pushing the mounting protrusion out of the mounting groove, making it easier to perform maintenance or replacement operations.

[0030] Preferably, a partial through groove is provided on at least one corner of the base body, and when multiple base bodies are spliced ​​together, the multiple partial through grooves are enclosed to form a channel;

[0031] The partial through groove is opened along the length direction of the base.

[0032] By adopting the above technical solution, after multiple substrates are spliced, multiple local through grooves form a closed channel. During the operation of the nuclear reactor, this closed channel can be used as an additional heat dissipation channel. The coolant can flow in the channel to take away the heat generated by the fuel elements and improve the heat dissipation efficiency. The shape and size of the closed channel can be designed according to actual needs to optimize the flow of the coolant. By adjusting parameters such as the width, height and curvature of the channel, the flow rate and flow of the coolant can be controlled so that it can better adapt to different reactor operating conditions.

[0033] The closed channel can cooperate with other parts of the matrix to improve the overall strength and stability of the fuel element. For example, the bearing capacity of the channel can be enhanced by adding reinforcing ribs around the channel or using special material structures to ensure that the fuel element can maintain structural integrity when subjected to internal pressure and external impact; the closed channel can be used to install sensors, such as temperature sensors, pressure sensors or flow sensors, and can also provide space for the wiring of the sensors to avoid interference with the normal operation of the fuel elements; in some special reactor designs, the number of closed channels can be increased or decreased as needed, or the shape and size of the channels can be changed to achieve better heat dissipation and structural stability.

[0034] Preferably, a plurality of flow-disturbing protrusions are evenly arranged on the channel side wall of the closed channel, and a fluid flows in the closed channel.

[0035] By adopting the above technical scheme, the presence of the spoiler protrusions causes the belt fluid circulating in the closed channel to generate turbulence during the flow process. Under the turbulent state, the fluid is mixed more fully and the heat transfer is faster. The spoiler protrusions destroy the laminar state of the fluid, causing the fluid to form a complex flow path in the channel, increasing the contact area between the fluid and the side wall of the channel, thereby improving the heat transfer coefficient, transferring the heat generated by the fuel element to the belt fluid more quickly, reducing the temperature of the fuel element, and ensuring the safe operation of the nuclear reactor. When the belt fluid carries impurities or particulate matter, the spoiler protrusions can play a certain blocking and dispersing role to prevent these impurities from accumulating and clogging in the channel; at the same time, by adjusting the shape, size, distribution density and other parameters of the spoiler protrusions, the flow and heat transfer performance of the belt fluid can be adjusted.

[0036] Preferably, a circular channel is provided at the center of the closed channel, and the circular channel is used for inserting a control rod or a heat extraction component.

[0037] By adopting the above technical solution, firstly, a circular channel is set at the center of the closed channel for inserting control rods, so that the control rods can be closer to the fuel elements, thereby more accurately controlling the reactivity of the nuclear reactor; secondly, the circular channel can be used to insert heat extraction components, such as heat pipes or cooling pipes, which can directly absorb heat from the vicinity of the fuel elements and quickly transfer it to the external cooling system, thereby enhancing the heat dissipation effect of the reactor.

[0038] In summary, the present application includes at least one of the following beneficial technical effects:

[0039] 1. The flexibility and adaptability of fuel elements are improved by splicing multiple substrates through the connection structure. Since multiple substrates can be spliced ​​through the connection structure, during the installation of the nuclear reactor, the fuel elements can be flexibly combined according to actual needs to adapt to different reactor designs and space requirements, making the installation more convenient and reducing the installation time and labor costs; when a fuel element fails or needs to be replaced, the element can be removed separately without affecting the normal operation of other elements. The splicing of the connection structure makes the replacement and maintenance process simpler and more efficient, reducing the maintenance cost;

[0040] The integrated type makes the fuel body and the matrix tightly combined, reducing the movement and vibration of the fuel body during operation. After multiple matrixes are spliced ​​through the connecting structure, an integral structure is formed, which further enhances the stability of the fuel element and reduces the safety risks caused by structural looseness. After multiple matrixes are spliced, the heat dissipation area is increased, the heat dissipation efficiency is improved, the temperature of the fuel element during operation is controlled within a safe range, the service life is extended, the leakage points are reduced, the sealing performance is improved, and the radiation hazards to the environment and personnel are reduced.

[0041] 2. When there is a fuel body in the matrix, placing the fuel body in the center of the matrix can enable the matrix to provide a relatively uniform support force for the fuel body in all directions. During the operation of the nuclear reactor, the ability to withstand internal pressure and external impact is enhanced, and the structural stability is improved. When the fuel body is in the center, the heat generated by the fuel body can be more evenly conducted to the surroundings of the matrix, thereby improving the heat dissipation efficiency, avoiding local overheating, and extending the service life of the fuel element;

[0042] When two or more fuel bodies are provided in the matrix and are evenly arranged in the matrix, the setting of multiple fuel bodies increases the fuel loading capacity, thereby improving the power output of the nuclear reactor. The evenly distributed fuel bodies can make the nuclear reaction more evenly carried out in the matrix, avoiding the generation of hot spots due to excessive local reactions, thereby improving the safety and stability of the reactor. The design of multiple fuel bodies also increases the redundancy of the system. If one of the fuel bodies fails, the other fuel bodies can continue to work, reducing the risk of reactor shutdown due to the failure of a single fuel body. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 It is a structural schematic diagram of an embodiment of the present application;

[0044] Figure 2 It is a schematic diagram of a splicing method of an embodiment of the present application;

[0045] Figure 3 It is a schematic diagram of a splicing structure of the present application;

[0046] Figure 4 It is a structural schematic diagram of another embodiment of the present application;

[0047] Figure 5 It is a schematic diagram of the opening position of the local through slot in this application;

[0048] Figure 6 It is a schematic diagram of the structure of the closed channel and the spoiler protrusion in this application.

[0049] Explanation of the reference numerals: 1. base; 11. column body; 12. column bottom; 2. fuel body; 21. fuel shell; 22. fuel; 3. connection structure; 31. connection groove; 32. connection rib; 33. mounting protrusion; 34. mounting groove; 4. partial through groove; 5. closed channel; 51. spoiler protrusion; 52. circular channel. DETAILED DESCRIPTION

[0050] The following is combined with Figure 1-6 This application is described in further detail.

[0051] The present application embodiment discloses an integrated splicable fuel element. Figure 1 and Figure 2The one-piece splicable fuel element includes a substrate 1 and a fuel body 2 arranged in the substrate 1. A connecting structure 3 is arranged on the substrate 1, and multiple substrates 1 are spliced ​​through the connecting structure 3 to adapt to devices of different sizes and dimensions. Since multiple substrates 1 can be spliced ​​through the connecting structure 3, during the installation of the nuclear reactor, the fuel elements can be flexibly combined according to actual needs to adapt to different reactor designs and space requirements, making the installation more convenient and reducing the installation time and labor costs; when a fuel element fails or needs to be replaced, the element can be disassembled separately without affecting the normal operation of other elements. The splicing method of the connecting structure 3 makes the replacement and maintenance process simpler and more efficient, reducing the maintenance cost.

[0052] The substrate 1 includes a column body 11 and a column base 12. In an optional embodiment, the substrate 1 is a cylindrical body. In an optional embodiment, the substrate 1 is a polygonal column. The column body 11 and the column base 12 are both provided with a connection structure 3. The substrate 1 is expanded laterally through the connection structure 3 on the column body 11, and is increased in length direction through the connection structure 3 on the column base 12. Specifically, the column base 12 is spliced ​​with the column base 12 of the adjacent substrate 1 through the connection structure 3, and the column body 11 is spliced ​​with the column body 11 of the adjacent substrate 1 through the connection structure 3. The splicing allows the substrate 1 to flexibly adapt to different reactor sizes, and flexibly adjust the overall length of the fuel element according to the design requirements of different nuclear reactors. The connection structure 3 on the column body 11 can realize a combination of multiple shapes to meet the geometric requirements of various types of nuclear reactors. Reactors with special shapes can also achieve the best arrangement of the fuel 22 by reasonably combining the substrate 1, thereby improving the versatility of the fuel element.

[0053] Optionally, during the installation process, the fuel elements are gradually spliced ​​according to the actual space and operating conditions to reduce the difficulty of installation. When maintenance or replacement of some elements is required, the matrix 1 of a specific length can be disassembled and spliced ​​in a targeted manner to improve maintenance efficiency. Splicing enables the fuel elements to better adapt to the complex spatial layout inside the reactor, make full use of limited space, and improve the power density and operating efficiency of the reactor. Through the combination of different shapes, the distribution of the fuel 22 in the reactor can be more flexibly adjusted to make the power output of the fuel 22 more uniform, reduce the generation of local hot spots, and improve the safety and stability of the reactor.

[0054] The connection structure 3 includes a connection groove 31 and a connection rib 32. In an optional embodiment, the column body 11 includes a plurality of cylindrical surfaces, each of which is provided with a connection groove 31 and / or a connection rib 32, or the connection groove 31 and the connection rib 32 are arranged alternately along the circumference of the column body 11. When splicing, a mutually interlocking structure can be formed to increase the tightness and stability of the connection between the substrates 1, and ensure that the overall structure of the fuel element is firm. During the installation process, the operator can simply insert the connection rib 32 of one substrate 1 into the connection groove 31 of another substrate 1 to achieve rapid splicing and improve installation efficiency; when the connection groove 31 and the connection rib 32 are alternately arranged on each adjacent two cylindrical surfaces of the column body 11, the alternately distributed connection grooves 31 and the connection rib 32 can share the load together, so that any two substrates 1 can be spliced ​​and installed through this structure, improving installation efficiency and meeting installation requirements.

[0055] In an optional embodiment, the connecting rib 32 is a trapezoid, the size of the connecting rib 32 away from the cylindrical surface is larger than the size of the connecting rib 32 connected to the cylindrical surface, and the middle part of the connecting rib 32 is a transition surface of two sizes, so that the connecting rib 32 is not easy to fall off when it is engaged with the connecting groove 31. Optionally, the connecting rib 32 is a semi-cylinder. When the connecting rib 32 is a semi-cylinder, the size of the shortest part of the cross section of the connecting rib 32 is at least 2 / 3 of the diameter of the connecting cross section. In an optional embodiment, the connecting rib 32 is a special-shaped column, and a plurality of columns or grooves can be provided on the connecting rib 32 along the length direction to prevent the connecting rib 32 from falling off from the connecting groove 31 during installation.

[0056] In a preferred embodiment, the connecting groove 31 is opened at the center line of the column body 11. When the connecting groove 31 is opened at the center line of the column body 11, the structure of the spliced ​​matrix 1 ensures that the force and stress borne by each matrix 1 during the operation of the nuclear reactor are more evenly distributed, thereby improving the stability of the overall structure. The connecting groove 31 at the center line can be used as a clear positioning mark during splicing, so that the operator can more accurately align and splice multiple matrixes 1, improve the accuracy and efficiency of installation, reduce installation errors, and at the same time, ensure that the connecting rib 32 can be smoothly inserted into the connecting groove 31 to achieve a tight connection.

[0057] In an optional embodiment, the connection grooves 31 are evenly arranged with the center line of the column body 11 as the symmetry line. When the connection grooves 31 are evenly arranged with the center line of the column body 11 as the symmetry line, multiple evenly arranged connection grooves 31 increase the connection points between the substrates 1. More connection points can disperse stress, reduce the burden of a single connection part, and reduce the risk of connection failure. Increasing the connection points can also enable the fuel element to better maintain structural integrity when subjected to external impact or vibration, thereby improving its seismic resistance.

[0058] There are two column bases 12, which are arranged in parallel with each other. In an optional embodiment, one column base 12 is provided with a mounting protrusion 33, and the other column base 12 is provided with a mounting groove 34 for the mounting protrusion 33 to be embedded; or the column base 12 of one column is provided with a mounting protrusion 33, and the column base 12 of the other column is provided with a mounting groove 34. When installing the fuel element, by embedding the mounting protrusion 33 of one column base 12 into the mounting groove 34 of the other column base 12, rapid positioning and connection can be achieved, which is simple and fast, and improves the installation efficiency. The cooperation of the mounting protrusion 33 and the mounting groove 34 can ensure that the two column bases 12 can be accurately aligned when spliced, avoid misalignment or offset, and ensure the overall structural stability of the fuel element; when the fuel element needs to be maintained or replaced, the design of the mounting protrusion 33 and the mounting groove 34 makes the disassembly process easier. Only by pushing the mounting protrusion 33 out of the mounting groove 34, the two column bases 12 can be separated, which is convenient for maintenance or replacement.

[0059] The fuel body 2 includes a fuel 22 shell 21 and fuel 22. The fuel 22 is filled in the fuel 22 shell 21. The fuel 22 shell 21 is a column or a sphere. When used, it is selected according to different scenarios. The column has a regular shape and clear geometric dimensions, and it is easier to achieve a stable arrangement in the matrix 1. It can match the shape of the matrix 1, making the overall structure of the fuel element more compact and stable. The side of the column can provide uniform support for the fuel 22, reduce the movement and shaking of the fuel 22 inside, and reduce the safety risks caused by the displacement of the fuel 22; the sphere is relatively stable. During the operation of the nuclear reactor, the external pressure on the fuel 22 shell 21 and the expansion force of the internal fuel 22 can be evenly distributed on the spherical surface, reducing stress concentration and reducing the risk of shell rupture. The shape of the sphere makes the fuel 22 shell 21 have better seismic resistance when it is impacted or vibrated, which improves the reliability of the fuel element. Regardless of the shape of the fuel body 2, it needs to be evenly arranged in the matrix 1 as needed.

[0060] In an optional embodiment, a local through groove 4 is provided on at least one corner of the substrate 1. When multiple substrates 1 are spliced, the multiple local through grooves 4 enclose a channel, and the local through groove 4 is provided along the length direction of the substrate 1. When multiple substrates 1 are spliced, the multiple local through grooves 4 form a closed channel 5. During the operation of the nuclear reactor, the closed channel 5 can be used as an additional heat dissipation channel. The coolant can flow in the channel to take away the heat generated by the fuel elements and improve the heat dissipation efficiency. The shape and size of the closed channel 5 can be designed according to actual needs to optimize the flow of the coolant. By adjusting parameters such as the width, height and curvature of the channel, the flow rate and flow rate of the coolant can be controlled so that it can better adapt to different reactor operating conditions.

[0061] Preferably, the closed channel 5 can cooperate with other parts of the matrix 1 to improve the overall strength and stability of the fuel element. For example, the bearing capacity of the channel can be enhanced by adding reinforcing ribs around the channel or adopting a special material structure to ensure that the fuel element can maintain structural integrity when subjected to internal pressure and external impact; the closed channel 5 can be used to install sensors, such as temperature sensors, pressure sensors or flow sensors, and can also provide space for the wiring of the sensors to avoid interference of the sensor lines with the normal operation of the fuel elements; in some special reactor designs, the number of closed channels 5 can be increased or decreased as needed, or the shape and size of the channels can be changed to achieve better heat dissipation and structural stability.

[0062] In a preferred embodiment, a plurality of spoiler ridges 51 are evenly arranged on the channel sidewall of the closed channel 5, and a belt fluid flows in the closed channel 5. The existence of the spoiler ridges 51 causes the belt fluid flowing in the closed channel 5 to generate turbulence during the flow process. In the turbulent state, the fluid is mixed more fully and the heat transfer is more rapid. The spoiler ridges 51 destroy the laminar flow state of the fluid, so that the fluid forms a complex flow path in the channel, and the contact area between the fluid and the channel sidewall is increased, thereby improving the heat transfer coefficient, transferring the heat generated by the fuel element to the belt fluid more quickly, reducing the temperature of the fuel element, and ensuring the safe operation of the nuclear reactor. When the belt fluid carries impurities or particulate matter, the spoiler ridges 51 can play a certain blocking and dispersing role to prevent these impurities from accumulating and clogging in the channel; at the same time, by adjusting the shape, size, distribution density and other parameters of the spoiler ridges 51, the flow and heat transfer performance of the belt fluid can be adjusted.

[0063] Preferably, a circular channel 52 is provided at the center of the closed channel 5, and the circular channel 52 is used to insert a control rod or a heat extraction component. First, the circular channel 52 is provided at the center of the closed channel 5 for inserting a control rod, so that the control rod can be closer to the fuel element, thereby more accurately controlling the reactivity of the nuclear reactor; secondly, the circular channel 52 can be used to insert a heat extraction component, such as a heat pipe or a cooling pipe, etc. These heat extraction components can directly absorb heat from the vicinity of the fuel element and quickly transfer it to the external cooling system, thereby enhancing the heat dissipation effect of the reactor.

[0064] The implementation principle of the embodiment of the present application is as follows: the substrate 1 is adaptively assembled according to the usage scenario. Since multiple substrates 1 can be spliced ​​through the connecting structure 3, during the installation of the nuclear reactor, the fuel elements can be flexibly combined according to actual needs to adapt to different reactor designs and space requirements, making the installation more convenient and reducing the installation time and labor costs; when a fuel element fails or needs to be replaced, the element can be removed separately without affecting the normal operation of other elements. The splicing method of the connecting structure 3 makes the replacement and maintenance process simpler and more efficient, reducing the maintenance cost; the integrated type makes the fuel body 2 and the substrate 1 tightly combined, reducing the movement and vibration of the fuel body 2 during operation. After the multiple substrates 1 are spliced ​​through the connecting structure 3, an integral structure is formed, which further enhances the stability of the fuel element and reduces the safety risk caused by structural looseness; after the multiple substrates 1 are spliced, the heat dissipation area is increased, the heat dissipation efficiency is improved, the temperature of the fuel element during operation is controlled within a safe range, the service life is extended, the leakage points are reduced, the sealing performance is improved, and the radiation hazard to the environment and personnel is reduced.

[0065] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. An integrated splicable fuel element, characterized in that: include: A substrate (1), and a fuel body (2) arranged in the substrate (1), each substrate (1) having at least one fuel body (2) therein, a plurality of connection structures (3) being arranged on the substrate (1), and a plurality of substrates (1) can be spliced ​​together via the connection structures (3).

2. The one-piece splicable fuel element according to claim 1, characterized in that: The base (1) comprises a column body (11) and a column base (12), wherein the column body (11) and the column base (12) are both provided with a connection structure (3), the column base (12) is spliced ​​with the column base (12) of the adjacent base (1) via the connection structure (3), and the column body (11) is spliced ​​with the column body (11) of the adjacent base (1) via the connection structure.

3. The one-piece splicable fuel element according to claim 2, characterized in that: The base body (1) contains a fuel body (2), the fuel body (2) is cylindrical and is arranged at the center of the base body (1); or Two or more fuel bodies (2) are arranged in the base body (1), and the fuel bodies (2) are evenly arranged in the base body (1).

4. The one-piece splicable fuel element according to claim 3, characterized in that: The fuel body (2) comprises a fuel shell (21) and fuel (22), wherein the fuel (22) is filled in the fuel shell (21), and the fuel shell (21) is a columnar body or a spherical body.

5. The one-piece splicable fuel element according to claim 2, characterized in that: The connection structure (3) comprises a connection groove (31) and a connection rib (32); the column body (11) comprises a plurality of column surfaces, each of which is provided with a connection groove (31) and / or a connection rib (32); or The connecting grooves (31) and the connecting ribs (32) are arranged alternately along the circumference of the column body.

6. The one-piece splicable fuel element according to claim 5, characterized in that: The connecting groove (31) is provided at the center line of the column body (11), or The connection grooves (31) are evenly arranged with the center line of the column body (11) as a symmetry line.

7. The one-piece splicable fuel element according to claim 2, characterized in that: Two column bases (12) are arranged opposite to each other, one of the column bases (12) is provided with a mounting protrusion (33), and the other column base (12) is provided with a mounting groove (34) for the mounting protrusion (33) to be embedded.

8. The one-piece splicable fuel element according to claim 1, characterized in that: A local through groove (4) is provided on at least one corner of the base body (1); when a plurality of base bodies (1) are spliced ​​together, the plurality of local through grooves (4) are enclosed to form a channel (5); The partial through groove (4) is opened along the length direction of the base body (1).

9. The one-piece splicable fuel element according to claim 8, characterized in that: A plurality of flow-disturbing protrusions (51) are evenly arranged on the channel side wall of the closed channel (5), and a fluid flows in the closed channel (5).

10. The one-piece splicable fuel element according to claim 9, characterized in that: A circular channel (52) is provided at the center of the closed channel (5), and the circular channel (52) is used for inserting a control rod or a heat extraction component.

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