Reactor core structure

Abstract

The invention discloses a reactor core structure, and relates to the technical field of nuclear reactors, a reactor core is arranged in a regular hexagon shape and comprises a center control rod, a plurality of first units and a plurality of second units, the first units are arranged in an isosceles trapezoid shape, and the second units are arranged in an arrow-like shape. The first units and the second units are arranged around the central control rod and jointly form a regular hexagonal structure. The reactor core structure provided by the invention overcomes the technical problems in the prior art that the overall layout of the reactor core is limited, the fixing difficulty between the modules is high and the like, and is compact in structure, not easy to loosen and convenient to weld and fix.

Description

Technical Field

[0001] The present invention relates to the technical field of nuclear reactors, and particularly to a reactor core structure. Background Art

[0002] In the technical field of nuclear reactors, the core of a heat pipe reactor is divided into two forms: integrated and modular. In particular, the modular reactor design has the advantages of good processability and convenient arrangement and distribution. Moreover, in the current prior art, the mainstream modular reactor is a hexagonal core. However, in the current prior art, the layout of the modular hexagonal core basically adopts the stacking method of regular hexagonal modules or regular triangular modules, with regular hexagonal modules and regular triangular modules as the reactor matrix, which makes the overall layout of the reactor very limited by the layout of the core modules. At the same time, due to the fixed side lengths of each module, when each module is combined with the central control rod for the overall layout, technical problems such as limited arrangement space occur; at the same time, when the hexagonal module and the regular triangular module are used for the core layout, there are a large number of contact points where the vertices are in contact, which increases the subsequent fixing difficulty of each module. When welding adjacent modules, the multiple top-bottom contacts increase the welding difficulty. Summary of the Invention

[0003] The purpose of the present invention is to solve the technical problems in the prior art such as the overall limitation of the reactor core layout and the large fixing difficulty between modules. The present invention provides the following technical solutions:

[0004] A reactor core structure, the core is arranged in a regular hexagon, including a central control rod, several first units and several second units. The first unit is arranged in an isosceles trapezoid shape, and the second unit is arranged in a shape similar to an arrow. The first unit and the second unit are both arranged around the central control rod and jointly form a regular hexagon structure.

[0005] Among them, six of the first units are closest to the central control rod and are arranged around the central control rod, and the side lengths of the six first units close to the central control rod jointly form a regular hexagon structure; among the six first units arranged around the central control rod, the bottom side of any one first unit is in contact with the waist side of another adjacent first unit.

[0006] The second unit is arranged at the top angle of the regular hexagon, used to make up for the position vacancies formed in the arrangement of the first unit, and jointly form a regular hexagon structure with the first unit.

[0007] Each first unit includes a first matrix, and each second unit includes a second matrix. Several mounting holes are provided on both the first matrix and the second matrix, and any one or both of the fuel assembly and the heat pipe are installed on the first matrix or the second matrix through the mounting holes.

[0008] Any three heat pipes are arranged in an equilateral triangle, and fuel assemblies are distributed between any two heat pipes.

[0009] The number of mounting holes on the first substrate is three, and the three mounting holes are arranged in a triangular pattern on the first substrate.

[0010] Among the mounting holes on the first substrate, at most one mounting hole is used to mount the heat pipe, and the remaining mounting holes are used to mount the fuel assemblies.

[0011] The number of mounting holes on the second substrate is two, and the two mounting holes are arranged side by side in the direction of the arrow on the second substrate.

[0012] Among the mounting holes on the second substrate, one mounting hole is used to mount the heat pipe, and the other mounting hole is used to mount the fuel assembly.

[0013] The present invention has the following advantages:

[0014] (1) For the reactor core structure provided by the present invention, by making the bottom edge of any one first unit contact the waist edge of another adjacent first unit, it is possible to avoid, to a limited extent, the layout where multiple vertices of adjacent first units or second units come into contact, reducing the welding difficulty. At the same time, it avoids technical problems such as module instability and easy separation that are prone to occur at the vertex contact points.

[0015] (2) The reactor core structure provided by the present invention is widely applicable to the mainstream hexagonal reactor core structure, with a high scope of application. At the same time, it minimizes the arrangement where vertices of the first unit or the second unit come into contact, making the overall layout of the reactor core more compact. Moreover, in this special-shaped arrangement layout, the overall reactor core is not prone to looseness and is more firmly fixed.

[0016] (3) For the reactor core structure provided by the present invention, during the layout setting, according to the size of the central control rod, the distance between the bottom edge of the first unit and the waist edge of another adjacent module unit in the six first units arranged around the central control rod can be adjusted, minimizing the gap between the central control rod and the first unit 1 as much as possible. Furthermore, within the target reactor power range, the volume of the reactor core is further miniaturized, achieving the technical effect of enabling the module unit to be adjusted according to the size of the central control rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural diagram of the reactor core of the present invention;

[0018] Figure 2 It is a schematic structural diagram of the first unit;

[0019] Figure 3It is a structural schematic diagram of the second unit;

[0020] Figure 4 It is a distribution diagram of the first unit arranged around the central control rod.

[0021] In the figure: 1. The first unit, 11. The first matrix, 2. The second unit, 21. The second matrix, 3. The central control rod, 4. The fuel assembly, 5. The heat pipe. Specific implementation manners

[0022] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0023] Therefore, the following detailed description of the embodiments of the present invention is not intended to limit the scope of the claimed present invention, but only represents some embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the scope of protection of the present invention.

[0024] It should be noted that, without conflict, the embodiments in the present invention and the features and technical solutions in the embodiments can be combined with each other.

[0025] It should be noted that: Similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. In the description of the present invention, it should be noted that the terms "upper", "lower", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the invention product is usually placed during use, or the orientation or positional relationship commonly understood by those skilled in the art. Such terms are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation of the present invention. In addition, the terms "first", "second", etc. are only used for descriptive distinction and cannot be understood as indicating or implying relative importance.

[0026] Refer to Figures 1 to 4 , a reactor core structure, the core is arranged in a regular hexagon, including a central control rod 3, several first units 1 and several second units 2; refer to Figure 2 , the cross-section of the first unit 1 is arranged in an isosceles trapezoid; refer to Figure 3The cross section of the second unit 2 is arranged in an arrow-like shape, and the first unit 1 and the second unit 2 are arranged around the central control rod 3 and together form a regular hexagonal structure. The first unit 1 is arranged in an isosceles trapezoidal shape, which can ensure that the effective area of ​​the first unit 1 is utilized to the maximum extent when the heat pipes 5 and the fuel assemblies 4 are arranged later, which is conducive to arranging the heat pipes 5 and the fuel assemblies 4 in the cross section of each first unit 1.

[0027] See also Figure 4 , wherein six of the first units 1 are closest to the central control rod 3 and are arranged around the central control rod 3, and the side lengths of the six first units 1 close to the central control rod 3 together form a regular hexagonal structure; among the six first units 1 arranged around the central control rod 3, the bottom edge of any first unit 1 contacts the waist edge of another adjacent first unit, that is, there is no contact between the top angles of any two adjacent first units 1.

[0028] In the above scheme, since the bottom edge of any first unit 1 of the six first units 1 arranged around the central control rod 3 is in contact with the waist edge of another adjacent first unit, there will be no situation where the top corners of two adjacent first units 1 are in contact. This makes it possible to weld only the parts where the adjacent side lengths are in contact when welding two adjacent first units 1, and there will be no situation where multiple top corners are in contact, and there is no need to weld at multiple top corners. This layout design method is more compact as a whole, and is convenient for the execution of subsequent welding steps. At the same time, it avoids technical problems such as unstable modules and easy separation after fixation that are easy to occur at the contact points of the vertices. Furthermore, when the layout is set, the size of the contact distance between the bottom edge of the first unit 1 and the waist edge of another adjacent module unit in the six first units 1 arranged around the central control rod 3 can be adjusted according to the size of the central control rod 3, so as to reduce the gap between the central control rod 3 and the first unit 1 as much as possible, thereby further miniaturizing the reactor core volume within the target reactor power; and achieving the technical effect of adjusting the module unit according to the size of the central control rod 3. Specifically, when the diameter of the central control rod 3 is relatively large, the overlapped contact portion of the bottom edge of the first unit 1 and the waist edge of another adjacent module unit can be adjusted to be a little smaller, so as to increase the side length of the regular hexagon formed by the two first units 1, so as to adapt to the size of the central control rod 3; when the diameter of the central control rod 3 is relatively small, the overlapped contact portion of the bottom edge of the first unit 1 and the waist edge of another adjacent module unit can be adjusted to be a little larger, so as to reduce the side length of the regular hexagon formed by the two first units 1. This allows the gap between the central control rod 3 and the first unit 1 to be adjustable according to different needs, further reducing the overall volume of the core.

[0029] See also Figure 1, the second unit 2 is arranged at the vertex of the regular hexagon, used to fill the position vacancy formed by the first unit 1 in the arrangement, and jointly form a regular hexagon structure with the first unit 1.

[0030] Refer to Figure 2 and Figure 3 , each first unit 1 includes a first base body 11, and each second unit 2 includes a second base body 21. A plurality of mounting holes are provided on both the first base body 11 and the second base body 21. Any one or both of the fuel assembly 4 and the heat pipe 5 pass through the mounting holes and are fixedly installed on the first base body 11 or the second base body 21. Among them, the mounting holes are used to install any one or both of the heat pipe 5 and the fuel assembly 4. Preferably, the heat pipe 5 and the fuel assembly 4 have the same diameter.

[0031] Refer to Figure 1 , in a reactor core structure in this embodiment, during the arrangement of the first unit 1 and the second unit 2, any three heat pipes 5 are arranged in an equilateral triangle, and a fuel assembly 4 is distributed between any two heat pipes 5. The heat pipes 5 arranged in this layout are convenient for the heat pipes 5 to exchange heat with the fuel assembly 4 with the highest efficiency.

[0032] The number of mounting holes on the first base body 11 is three, and the three mounting holes are arranged in a triangle on the first base body 11. Among the mounting holes on the first base body 11, at most one mounting hole is used to install the heat pipe 5, and the remaining mounting holes are used to install the fuel assembly 4. The number of mounting holes on the second base body 21 is two, and the two mounting holes are arranged side by side in the arrow direction on the second base body 21. Among the mounting holes on the second base body 21, one mounting hole is used to install the heat pipe 5, and the other mounting hole is used to install the fuel assembly 4.

[0033] Each first unit 1 is provided with three mounting holes, that is, there are three positions for placing any one or both of the fuel assembly 4 and the heat pipe 5 in the future, which can maximize the area of ​​the space of the first substrate 11 used by the heat pipe 5 or the fuel assembly 4, thereby reducing the interval gap between the heat pipe 5 or the fuel assembly 4 in the first unit 1, and improving the overall space utilization. Two mounting holes are provided on the second unit 2, which can also maximize the area of ​​the second unit 2 used by the heat pipe 5 or the fuel assembly 4. In this embodiment, there are two distribution methods for the three mounting holes of the first unit 1, distribution method 1: placing the heat pipe 5 in one of the mounting holes and placing the fuel assembly 4 in the other two mounting holes; distribution method 2: all three mounting holes are installed and placed with the fuel assembly 4. These two distribution methods, combined with the distribution method of the heat pipe 5 and the fuel assembly 4 of the second unit 2, are arranged and distributed around the central control rod 3 by the above scheme, and finally a modular reactor core structure is formed in which a fuel assembly 4 is distributed between any two heat pipes 5. The reactor core structure has a compact layout and a reliable structure, and is convenient for welding and fixing between module units. It avoids vertex contact between multiple adjacent modules as much as possible, is not prone to loosening, is more tightly fastened, and is widely applicable to common regular hexagonal cores.

[0034] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A reactor core structure, wherein the core is arranged in a regular hexagonal shape, characterized in that: It includes a central control rod, a plurality of first units and a plurality of second units, wherein the first units are arranged in an isosceles trapezoidal shape, the second units are arranged in an arrow-like shape, and the first units are arranged around the central control rod and together form a regular hexagonal structure.

2. A reactor core structure according to claim 1, characterized in that: Six of the first units are closest to the central control rod and are arranged around the central control rod, and the side lengths of the six first units close to the central control rod together form a regular hexagonal structure; among the six first units arranged around the central control rod, the bottom edge of any first unit is in contact with the waist edge of another adjacent first unit.

3. A reactor core structure according to claim 2, characterized in that: The second unit is arranged at the vertex of a regular hexagon, and is used to fill the position vacancy formed by the first unit in the arrangement, and together with the first unit, forms a regular hexagonal structure.

4. A reactor core structure according to claim 1, characterized in that: Each first unit includes a first substrate, and each second unit includes a second substrate. The first substrate and the second substrate are both provided with a plurality of mounting holes, and any one or both of the fuel assembly and the heat pipe are mounted on the first substrate or the second substrate through the mounting holes.

5. A reactor core structure according to claim 4, characterized in that: Any three heat pipes are arranged in an equilateral triangle, and a fuel assembly is distributed between any two heat pipes.

6. A reactor core structure according to claim 4, characterized in that: The number of the mounting holes on the first substrate is three, and the three mounting holes are arranged in a triangle shape on the first substrate.

7. A reactor core structure according to claim 6, characterized in that: Among the mounting holes on the first substrate, at most one mounting hole is used to mount the heat pipe, and the remaining mounting holes are used to mount the fuel assembly.

8. A reactor core structure according to claim 4, characterized in that: The number of the mounting holes on the second base is two, and the two mounting holes are distributed side by side along the arrow direction on the second base.

9. A reactor core structure according to claim 8, characterized in that: Among the mounting holes on the second substrate, one mounting hole is used for mounting the heat pipe, and the other mounting hole is used for mounting the fuel assembly.

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