Gas cooled reactor reflecting layer device and installation method

Abstract

The invention discloses a gas cooled reactor reflecting layer device and an installation method, the gas cooled reactor reflecting layer device comprises a first reflecting layer (1), a second reflecting layer (2) and a third reflecting layer (3), one end face of the first reflecting layer (1) is provided with a concave structure which is continuous along the circumferential direction, and two end faces of the second reflecting layer (2) are respectively provided with a convex structure and a concave structure which are continuous along the circumferential direction. One end face of the third reflecting layer (3) is provided with a convex structure which is continuous in the circumferential direction; the concave structure of the first reflecting layer (1) and the convex structure of the second reflecting layer (2) can be arranged in an embedded manner, and the concave structure of the second reflecting layer (2) and the convex structure of the third reflecting layer (3) can be arranged in an embedded manner. The installation cost is reduced while the installation process is simplified, so that the maintainability of the reactor is improved.

Description

Technical Field

[0001] The invention relates to the field of gas-cooled reactor reflector devices in nuclear power plants, and in particular to a gas-cooled reactor reflector device and an installation method thereof. Background Art

[0002] The core fuel assembly of the prismatic high temperature gas-cooled reactor is composed of a large number of hexagonal graphite bricks. The core fuel assembly is stacked to form a bulk structure. Since the bulk structure is unstable, it must be constrained in the formed core cavity by the corresponding side reflector structure. Due to the high operating temperature, large irradiation dose and complex operating conditions of the reactor, the side reflector structure must have the characteristics of high temperature resistance, radiation resistance and high strength.

[0003] Because graphite materials cannot be welded, the existing side reflector layer structure, such as the side reflector layer of Tsinghua's high-temperature gas-cooled reactor, is made of fan-shaped graphite bricks stacked up and connected by keys and tenons to form a whole. The stacked fan-shaped graphite bricks are prone to loosening, which will not only cause circumferential looseness, but also axial looseness; in order to maintain the shape of the side reflector layer structure, a large constraint load is required, which is difficult to achieve by key and tenon connection. In addition, the inconvenience of key and tenon installation can easily cause stress concentration and cause damage. The existing high-temperature gas-cooled reactor side reflector layer structure can only provide good circumferential constraints on the core fuel assembly, and the axial constraint effect is poor. There is a risk of excessive axial gaps in the graphite bricks, which in turn causes coolant leakage, seriously affecting the normal operation of the reactor.

[0004] In the patent document CN113674880B, a lower reflector layer, a core and a high-temperature gas-cooled reactor of a prismatic high-temperature gas-cooled reactor are disclosed, wherein the lower reflector layer is composed of a plurality of graphite bricks, wherein the graphite bricks have chambers and grooves therein, wherein the chamber is located at the center of the graphite bricks for circulating coolant; the grooves are located at the upper section of the graphite bricks, wherein the inlet of the grooves is located on the upper end surface of the graphite bricks and is connected to the core coolant outlet, and the outlet of the grooves is connected to the chamber, but the problem that the side reflector structure of the existing high-temperature gas-cooled reactor cannot meet the requirements of the prismatic high-temperature gas-cooled reactor for a larger load-bearing capacity and cannot better realize the problem of bidirectional synchronous constraint of the core fuel assembly in the axial and circumferential directions is not solved.

[0005] Patent document CN105849817B discloses a fast neutron reactor and a neutron reflector assembly of a fast neutron reactor, wherein the fast neutron reactor comprises a core composed of fuel elements cooled by liquid heavy metal coolant, a neutron reflector assembly arranged around the core, the neutron reflector assembly comprising a steel shell, at least one inlet hole for discharging part of the coolant flow from the space between the components to the inside of the shell is arranged on the side wall of the shell higher than the upper edge of the core, and at least one vertical pipe installed in the shell, the discharged coolant flow enters the bottom of the shell along the vertical pipe through the upper edge and the lower edge of the core, and a flow guide device for forming hydraulic resistance of the coolant flow in the space between the components is installed on the outer side of the shell higher than the inlet and outlet holes, which does not solve the problem that the side reflector structure of the existing high-temperature gas-cooled reactor cannot meet the requirements of the prismatic high-temperature gas-cooled reactor for a larger load-bearing capacity, and cannot better realize the bidirectional synchronous constraint of the core fuel assembly in the axial and circumferential directions.

[0006] In summary, the above two existing patents have not solved the problem that the side reflection layer structure of the existing high temperature gas-cooled reactor cannot meet the requirements of the prismatic high temperature gas-cooled reactor for a larger load-bearing capacity, and cannot better achieve the problem of bidirectional synchronous constraint of the core fuel assembly in the axial and circumferential directions. Summary of the invention

[0007] Based on the above technical problems, the present invention proposes a gas-cooled reactor reflector layer device and installation method to solve the problem that the side reflector layer structure of the existing high-temperature gas-cooled reactor cannot meet the requirements of the prismatic high-temperature gas-cooled reactor for a larger bearing capacity, and cannot better achieve the bidirectional synchronous constraint of the core fuel assembly in the axial and circumferential directions.

[0008] To achieve the above object, the present invention proposes a gas-cooled reactor reflector device.

[0009] A gas-cooled reactor reflector device comprises a first reflector layer, a second reflector layer and a third reflector layer, wherein one end surface of the first reflector layer has a circumferentially continuous concave structure, two end surfaces of the second reflector layer respectively have a circumferentially continuous convex structure and a circumferentially continuous concave structure, and one end surface of the third reflector layer has a circumferentially continuous convex structure;

[0010] The concave structure of the first reflective layer and the convex structure of the second reflective layer can be interlocked, and the concave structure of the second reflective layer and the convex structure of the third reflective layer can be interlocked.

[0011] Furthermore, the outer surface of the reflective layer device is a prism, and the first reflective layer, the second reflective layer and the third reflective layer are distributed from top to bottom along the axis of the reflective layer device.

[0012] Furthermore, the inner surface of the reflective layer device is tooth-shaped, the tooth shape is composed of ridges protruding from the inner surface, the ridges are parallel to the axis of the reflective layer device, and the first reflective layer, the second reflective layer and the third reflective layer are arranged in a tooth-shaped manner corresponding to each other.

[0013] Furthermore, the side surfaces of the concave structures of the first reflective layer and the second reflective layer are arranged parallel to the outer surfaces of the first reflective layer and the second reflective layer;

[0014] The side surfaces of the protruding structures of the second reflective layer and the third reflective layer are arranged in parallel with the outer surfaces of the second reflective layer and the third reflective layer.

[0015] Furthermore, the ratio of the height to the width of the concave structures of the first reflective layer and the second reflective layer is in the range of 1.8-2.8, and the ratio of the height to the width of the convex structures of the second reflective layer and the third reflective layer is in the range of 1.0-2.0.

[0016] Further, the first reflective layer includes a first reflective layer first unit, a plurality of first reflective layer second units and a first reflective layer third unit along the circumferential direction, the second reflective layer includes a second reflective layer first unit, a plurality of second reflective layer second units and a second reflective layer third unit along the circumferential direction, the third reflective layer includes a third reflective layer first unit, a plurality of third reflective layer second units and a third reflective layer third unit along the circumferential direction, the first reflective layer first unit and the first reflective layer second unit are interlockingly arranged, the plurality of first reflective layer second units are interlockingly arranged, and the first reflective layer second unit and the first reflective layer third unit are interlockingly arranged;

[0017] The first unit of the second reflective layer and the second unit of the second reflective layer are interlocked, a plurality of second units of the second reflective layer are interlocked, and the second unit of the second reflective layer and the third unit of the second reflective layer are interlocked;

[0018] The first unit of the third reflective layer and the second unit of the third reflective layer are interlocked, a plurality of the second units of the third reflective layer are interlocked, and the second unit of the third reflective layer and the third unit of the third reflective layer are interlocked.

[0019] Furthermore, one end surface of the first reflective layer first unit, the first reflective layer second unit and the first reflective layer third unit all has a groove, and the grooves are spliced ​​to form a concave structure of the first reflective layer.

[0020] Further, the first unit of the first reflective layer includes a convex portion, the second unit of the first reflective layer includes a convex portion and a concave portion, and the third unit of the first reflective layer includes a concave portion.

[0021] The convex parts of the first reflective layer first unit are arranged on both sides of the first reflective layer first unit, and extend along the groove of the first reflective layer first unit to the outside of the first reflective layer first unit;

[0022] The convex portion of the first reflective layer second unit is arranged at one side of the first reflective layer second unit, and extends along the concave portion of the first reflective layer second unit to the outside of the first reflective layer second unit, and the concave portion of the first reflective layer second unit and the convex portion of the first reflective layer first unit are arranged to be embedded;

[0023] The concave parts of the third unit of the first reflective layer are arranged on both sides of the third unit of the first reflective layer, and can be embedded with the convex parts of the second unit of the first reflective layer;

[0024] The concave portions of the first reflective layer second unit and the first reflective layer third unit respectively penetrate one end surface of the first reflective layer second unit and the first reflective layer third unit.

[0025] Furthermore, one end face of the second reflective layer first unit, the second reflective layer second unit and the second reflective layer third unit each has a groove, and the other end face each has a boss, the grooves are spliced ​​to form a concave structure of the second reflective layer, and the bosses are spliced ​​to form a convex structure of the second reflective layer.

[0026] Further, the first unit of the second reflecting layer includes a convex portion, the second unit of the second reflecting layer includes a convex portion and a concave portion, the third unit of the second reflecting layer includes a concave portion, and the convex portions of the first unit of the second reflecting layer are arranged on both sides of the first unit of the second reflecting layer and extend along the concave portion of the first unit of the second reflecting layer to the outside of the first unit of the second reflecting layer;

[0027] The convex portion of the second reflective layer second unit is arranged at one side of the second reflective layer second unit, and extends along the concave portion of the second reflective layer second unit to the outside of the second reflective layer second unit, and the concave portion of the second reflective layer second unit and the convex portion of the second reflective layer first unit are arranged to be embedded;

[0028] The concave parts of the third unit of the second reflective layer are arranged at two sides of the third unit of the second reflective layer, and can be embedded with the convex parts of the second unit of the second reflective layer;

[0029] The concave portions of the second reflective layer second unit and the second reflective layer third unit respectively penetrate one end surface of the second reflective layer second unit and the second reflective layer third unit.

[0030] Furthermore, one end surface of the first unit of the third reflective layer, the second unit of the third reflective layer and the third unit of the third reflective layer all has a boss, and the bosses are spliced ​​to form a convex structure of the third reflective layer.

[0031] Further, the first unit of the third reflective layer includes a convex portion, the second unit of the third reflective layer includes a convex portion and a concave portion, the third unit of the third reflective layer includes a concave portion, and the convex portions of the first unit of the third reflective layer are arranged on both sides of the first unit of the third reflective layer;

[0032] The convex portion of the second unit of the third reflective layer is arranged on one side of the second unit of the third reflective layer, and the concave portion of the second unit of the third reflective layer and the convex portion of the first unit of the third reflective layer are arranged to be embedded;

[0033] The concave parts of the third unit of the third reflective layer are arranged on both sides of the third unit of the third reflective layer, and can be embedded with the convex parts of the second unit of the third reflective layer;

[0034] The concave portions of the third reflective layer second unit and the third reflective layer third unit respectively penetrate one end surface of the third reflective layer second unit and the third reflective layer third unit.

[0035] Furthermore, the ridges include single-rib ridges and platform ridges, the single-rib ridges are located at the connection position of at least some units in the reflective layer device, the platform ridges are located at the non-connection position of at least some units, and the single-rib ridges are formed by splicing parts of adjacent units.

[0036] Furthermore, the reflective layer device includes one first reflective layer, a plurality of second reflective layers and one third reflective layer.

[0037] Furthermore, the concave structures and convex structures between the plurality of second reflective layers can be arranged to be embedded.

[0038] Furthermore, the reflective layer device is made of graphite.

[0039] To achieve the above object, the present invention also provides a method for installing a reflective layer device of a gas-cooled reactor.

[0040] A method for installing a reflective layer device of a gas-cooled reactor, characterized by comprising:

[0041] S1: Assembling the third reflective layer;

[0042] S2: assembling the second reflective layer and the first reflective layer according to the required height of the core;

[0043] S3: sequentially embedding and installing the second reflective layer and the first reflective layer on the end surface of the third reflective layer.

[0044] Furthermore, the step S1 includes:

[0045] Firstly, the position of the first unit of the third reflective layer is determined and installed, the second unit of the third reflective layer is embedded into the first unit of the third reflective layer, and then the third unit of the third reflective layer is installed.

[0046] Furthermore, the step S2 includes:

[0047] The number of the second reflective layers is obtained according to the height of the core, and the second reflective layers are assembled according to the number.

[0048] Furthermore, the step S3 includes:

[0049] The second reflective layer and the third reflective layer are sequentially arranged at positions corresponding to the tooth shapes of the inner surfaces.

[0050] Based on the above technical solution, the present invention has at least the following beneficial effects:

[0051] 1. The present invention proposes a gas-cooled reactor reflector layer device and an installation method. By interlocking reflector layers of different structures to build a reflector layer device, the self-limitation of the structure is achieved, thereby significantly enhancing the stability and reliability of the side reflector layer. This design not only improves the strength of the structure and ensures the shape integrity of the core fuel assembly, but also improves the safety of reactor operation by reducing the risk of coolant leakage. The splicing design in the present invention simplifies the installation process, reduces installation costs and time, and makes maintenance and replacement of components in the device more convenient, thereby improving the maintainability of the reactor.

[0052] 2. The present invention proposes a gas-cooled reactor reflector layer device and an installation method. The units in the reflector layer all adopt a side reflector layer structure made of graphite material. Due to its high temperature resistance and radiation resistance, it is particularly suitable for the harsh working environment of a high-temperature gas-cooled reactor. At the same time, the high-strength support and restraint capabilities of graphite bricks ensure the stability of the core fuel assembly under high temperature and radiation. The mosaic structure of the present invention avoids the stress concentration problem that may be caused by traditional key and mortise connection methods, thereby reducing the risk of damage and further improving the safety and reliability of the reactor.

[0053] 3. The present invention proposes a reflector layer device for a gas-cooled reactor and an installation method, wherein a plurality of reflector layer structures can simultaneously constrain the core fuel assembly axially and circumferentially, and this bidirectional constraint effect significantly improves the constraint efficiency, reduces the risk of coolant leakage, and thus improves the operating safety of the reactor; the use of graphite material enables the side reflector layer structure to have better performance in high temperature and irradiation environments, and enhances the environmental adaptability of the reactor; the structural design of the reflector layer device also has good adaptability, and can adapt to prismatic high-temperature gas-cooled reactors of different scales and designs, providing important technical support for the development of high-temperature gas-cooled reactor technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0055] Figure 1 A schematic diagram of the three-dimensional structure of a gas-cooled reactor reflector device according to an embodiment is shown;

[0056] Figure 2 A schematic diagram of the three-dimensional structure of the first reflector layer of a reflector layer device of a gas-cooled reactor according to one embodiment is shown;

[0057] Figure 3 A schematic diagram of the three-dimensional structure of the second reflector layer of a reflector layer device of a gas-cooled reactor according to one embodiment is shown;

[0058] Figure 4 A schematic diagram of the three-dimensional structure of the third reflector layer of a reflector layer device of a gas-cooled reactor according to one embodiment is shown;

[0059] Figure 5 A schematic diagram of the three-dimensional structure of each unit of the first reflective layer of a gas-cooled reactor reflective layer device according to one embodiment is shown;

[0060] Figure 6 A schematic diagram of the three-dimensional structure of each unit of the second reflective layer of a gas-cooled reactor reflective layer device according to one embodiment is shown;

[0061] Figure 7 A schematic diagram of the three-dimensional structure of each unit of the third reflective layer of a gas-cooled reactor reflective layer device according to one embodiment is shown;

[0062] Figure 8 A schematic diagram of the installation process of each unit of the third reflector layer of a gas-cooled reactor reflector layer device according to one embodiment is shown.

[0063] The above-mentioned drawings include the following reference numerals:

[0064] 1. First reflection layer; 2. Second reflection layer; 3. Third reflection layer; 4. Ridge; 5. Groove; 6. Boss;

[0065] 11. The first unit of the first reflective layer; 12. The second unit of the first reflective layer; 13. The third unit of the first reflective layer;

[0066] 21. The first unit of the second reflective layer; 22. The second unit of the second reflective layer; 23. The third unit of the second reflective layer;

[0067] 31. first unit of the third reflective layer; 32. second unit of the third reflective layer; 33. third unit of the third reflective layer;

[0068] 41. Single ridge; 42. Platform ridge. DETAILED DESCRIPTION

[0069] It should be noted that, in the absence of conflict, the embodiments of 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 accompanying drawings and in combination with the embodiments.

[0070] The present invention is further described in detail below in conjunction with specific embodiments, and these embodiments cannot be understood as limiting the scope of protection claimed by the present invention. The term "including" when used indicates the existence of a feature, but does not exclude the existence or addition of one or more other features; the orientation or position relationship indicated by the terms "lateral", "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inside", "outside", etc. is based on the orientation or position relationship shown in the drawings, which is only for the convenience of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention; in addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance.

[0071] In the description, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. In addition, in the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0072] Example

[0073] The present invention provides a gas-cooled reactor reflector device and an installation method thereof. Figure 1As shown in the figure, it includes a first reflective layer 1, a second reflective layer 2 and a third reflective layer 3, one end face of the first reflective layer 1 has a concave structure continuous along the circumferential direction, the two end faces of the second reflective layer 2 respectively have a convex structure and a concave structure continuous along the circumferential direction, and one end face of the third reflective layer 3 has a convex structure continuous along the circumferential direction; the concave structure of the first reflective layer 1 and the convex structure of the second reflective layer 2 can be embedded, and the concave structure of the second reflective layer 2 and the convex structure of the third reflective layer 3 can be embedded.

[0074] In the present invention, the “end face” refers to the face of the reflective layer or other components / structures located at the top or bottom along the axial direction of the reflective layer device.

[0075] In the present invention, "interlockable arrangement" means that two or more mechanical parts can be connected together through a specific interface or joint surface design to form a complete structure or system. This arrangement requires that the shape, size and locking mechanism of the interface or joint surface between the parts match.

[0076] In the present invention, the “tooth shapes correspond to each other” means that in the reflective layer device, when different reflective layers are installed, the ridges 4 in the tooth shapes of different reflective layers are arranged correspondingly along the axial direction of the reflective layer device to form a plurality of complete ridges 4 .

[0077] In the present invention, the “reflection layer” refers to all the reflective layers in the reflective layer device including the first reflective layer 1 , the second reflective layer 2 and the third reflective layer 3 .

[0078] In the present invention, the “unit” refers to the entire range of units in the reflective layer device, including the first reflective layer first unit 11, the first reflective layer second unit 12, the first reflective layer third unit 13, the second reflective layer first unit 21, the second reflective layer second unit 22, the second reflective layer third unit 23, the third reflective layer first unit 31, the third reflective layer second unit 32 and the third reflective layer third unit 33.

[0079] In the present invention, "one side", "two sides" or "side faces" of a unit refer to one surface or two surfaces of the reflective layer device where the units arranged along the circumferential direction are connected to each other.

[0080] Specifically, Figure 1 As shown in the embodiment, according to the length of the gas-cooled reactor, the reflection layer device has one first reflection layer 1, two second reflection layers 2 and one third reflection layer 3 which are sequentially embedded and arranged to construct the reflection layer device.

[0081] Furthermore, the side surfaces of the concave structures of the first reflecting layer 1 and the second reflecting layer 2 are arranged parallel to the outer surfaces of the first reflecting layer 1 and the second reflecting layer 2, and the side surfaces of the convex structures of the second reflecting layer 2 and the third reflecting layer 3 are arranged parallel to the outer surfaces of the second reflecting layer 2 and the third reflecting layer 3.

[0082] Furthermore, the ratio of the height to the width of the concave structure of the first reflective layer 1 and the second reflective layer 2 is in the range of 1.8-2.8. The ratio range here is obtained through simulation calculation. If it is greater than 2.8, the shear strength is insufficient and the raised part is easy to break; if the value is less than 1.8, the insertion distance is insufficient, which easily causes the different layers of reflective layers to separate; preferably, the ratio of the height to the width of the concave structure of the first reflective layer 1 and the second reflective layer 2 is 2.3.

[0083] Furthermore, the ratio of the height to the width of the protruding structures of the second reflective layer 2 and the third reflective layer 3 is in the range of 1.0-2.0. The ratio range here is obtained through simulation calculation. If it is greater than 2.0, the shear strength is insufficient and the protruding part is easy to break; if the value is less than 1.0, the insertion distance is insufficient, which may easily cause the different reflective layers to separate; preferably, the ratio of the height to the width of the concave structure of the first reflective layer 1 and the second reflective layer 2 is 1.6.

[0084] In the present invention, the “side surfaces” of the concave structures of the first reflecting layer 1 and the second reflecting layer 2 are the multiple surfaces connected to the respective end surfaces of the concave structures and the first reflecting layer 1 and the second reflecting layer 2, and the side surfaces of the convex structures of the second reflecting layer 2 and the third reflecting layer 3 are the multiple surfaces in the convex structures connected to the respective end surfaces of the second reflecting layer 2 and the third reflecting layer 3.

[0085] Furthermore, the three-dimensional structure of the first reflective layer 1 is as follows: Figure 2 As shown in the figure, it includes 1 first reflection layer first unit 11, 4 first reflection layer second units 12 and 1 first reflection layer third unit 13, wherein the first reflection layer first unit 11 and the first reflection layer third unit 13 are adjacently embedded, the 4 first reflection layer second units 12 are sequentially embedded along the radial direction of the reflection layer device, the 4 first reflection layer second units 12 are embedded with each other, and the 4th first reflection layer second unit 12 is connected to the first reflection layer third unit 13, forming the first reflection layer 1.

[0086] Furthermore, the three-dimensional structure of the second reflective layer 2 is as follows: Figure 3As shown in the figure, it includes 1 second reflecting layer first unit 21, 4 second reflecting layer second units 22 and 1 second reflecting layer third unit 23, wherein the second reflecting layer first unit 21 and the second reflecting layer third unit 23 are adjacently embedded, the 4 second reflecting layer second units 22 are sequentially embedded along the radial direction of the reflecting layer device, the 4 second reflecting layer second units 22 are embedded with each other, and the 4th second reflecting layer second unit 22 is connected to the second reflecting layer third unit 23 to form the second reflecting layer 2.

[0087] Furthermore, the three-dimensional structure of the third reflective layer 3 is as follows: Figure 4 As shown in , it includes 1 third reflective layer first unit 31, 4 third reflective layer second units 32 and 1 third reflective layer third unit 33, wherein the third reflective layer first unit 31 and the third reflective layer third unit 33 are adjacently embedded, the 4 third reflective layer second units 32 are sequentially embedded along the radial direction of the reflective layer device, the 4 third reflective layer second units 32 are embedded with each other, and the 4th third reflective layer second unit 32 is connected to the third reflective layer third unit 33, so as to form the third reflective layer 3.

[0088] Furthermore, each layer of the reflective layer device can be composed of 6 units, 8 units, 10 units or 12 units. When the number of units is more than 6 units, such as 8 units, 10 units or 12 units, the installation gap is significantly increased compared with 6 units. Due to the bypass flow, the core cooling capacity and the reactor power generation efficiency are lower than those of 6 units. When the number of units is less than 6 units, the temperature difference at different positions of the units is large, and the thermal stress distribution is not as uniform as when 6 units are set.

[0089] Preferably, each layer of the reflective layer device is composed of 6 units, the outer surface of the reflective layer device is a regular twelve-sided prism, the outer surface of each unit has three faces, and the length and width of the face formed by adjacent units are equal to the length and width of the face of each unit that is not adjacent to other units; each unit uses three faces as the outer surface so that there is no through installation gap between different layers of reflective layers, thereby ensuring that leakage is reduced, and this part is a structural member that bears the shear force of different layers or different blocks of reflective layers. If each unit uses two faces, the raised part of some units of the reflective layer will become thinner, and the strength will be lower than that of three faces. In combination with the calculation of strength and leakage, it is preferred that the outer surface of each unit has three faces.

[0090] In other embodiments, according to different reactor structures, the number of unit components in the first reflecting layer 1, the second reflecting layer 2 and the third reflecting layer 3 in the reflecting layer device may also be 4, 8, 10 or 12.

[0091] Furthermore, the depth and width of the concave structure of the first reflective layer 1 are equal to those of the concave structure of the second reflective layer 2, and are equal to the height and width of the convex structures of the second reflective layer 2 and the third reflective layer 3, so that the first reflective layer 1 and the second reflective layer 2 can be interlocked, the second reflective layer 2 and the third reflective layer 3 can be interlocked, and multiple second reflective layers 2 can be interlocked.

[0092] Furthermore, if Figure 5 , the three-dimensional structures of the first reflective layer first unit 11, the first reflective layer second unit 12 and the first reflective layer third unit 13 are respectively shown, and one end surface of the first reflective layer first unit 11, the first reflective layer second unit 12 and the first reflective layer third unit 13 each has a groove 5, and the grooves 5 on one end surface of the first reflective layer first unit 11, the first reflective layer second unit 12 and the first reflective layer third unit 13 are spliced ​​to form a concave structure of the first reflective layer 1.

[0093] Furthermore, if Figure 5 As shown in the figure, the first reflective layer first unit 11 includes two rectangular parallelepiped convex parts arranged on the side of the unit, and the shape structure, length, width and height of the two convex parts are completely equal. The convex part of the first reflective layer first unit 11 extends along the groove 5 of the first reflective layer first unit 11 to the outside of the first reflective layer first unit 11; Figure 5 As shown in , the first reflective layer second unit 12 includes a concave portion and a convex portion arranged on the side of the unit, wherein the convex portion is a rectangular parallelepiped and the concave portion is a rectangular parallelepiped groove 5; the convex portion of the first reflective layer second unit 12 extends along the groove 5 of the first reflective layer second unit 12 to the outside of the first reflective layer second unit 12, the convex portion of the first reflective layer second unit 12 is equal to the convex portion of the first reflective layer first unit 11 in length, width and height, and the concave portion of the first reflective layer second unit 12 is equal to the length, width and height of the convex portion of the first reflective layer second unit 12, so that the convex portion of the first reflective layer first unit 11 can be embedded in the concave portion of the first reflective layer second unit 12; as shown in Figure 5 The first reflective layer third unit 13 shown in the figure includes two recesses arranged on the side of the unit, and the two recesses are both rectangular parallelepiped grooves 5; the shape structure, length, width and depth of the two recesses are completely equal, and the length, width and depth of the two recesses of the first reflective layer third unit 13 are completely equal to the recess of the first reflective layer second unit 12, so that the convex portion of the first reflective layer first unit 11 and the convex portion of the first reflective layer second unit 12 can be embedded in the recess of the first reflective layer third unit 13.

[0094] Furthermore, the concave portions of the first reflective layer second unit 12 and the first reflective layer third unit 13 penetrate one end surface of the first reflective layer second unit 12 and the first reflective layer third unit 13 , respectively.

[0095] Furthermore, if Figure 6 , the three-dimensional structures of the second reflecting layer first unit 21, the second reflecting layer second unit 22 and the second reflecting layer third unit 23 are respectively shown. One end surface of the second reflecting layer first unit 21, the second reflecting layer second unit 22 and the second reflecting layer third unit 23 each has a groove 5, and the other end surface each has a boss 6. The grooves 5 on one end surface of the second reflecting layer first unit 21, the second reflecting layer second unit 22 and the second reflecting layer third unit 23 are spliced ​​to form a concave structure of the second reflecting layer 2, and the bosses 6 on one end surface of the second reflecting layer first unit 21, the second reflecting layer second unit 22 and the second reflecting layer third unit 23 are spliced ​​to form a convex structure of the second reflecting layer 2.

[0096] Furthermore, if Figure 6 As shown in the figure, the second reflective layer first unit 21 includes two rectangular parallelepiped convex parts arranged on the side of the unit, and the shape structure, length, width and height of the two convex parts are completely equal. The convex part of the second reflective layer first unit 21 extends along the groove 5 of the second reflective layer first unit 21 to the outside of the second reflective layer first unit 21; Figure 6 As shown in , the second reflective layer second unit 22 includes a concave portion and a convex portion arranged on the side of the unit, wherein the convex portion is a rectangular parallelepiped and the concave portion is a rectangular parallelepiped groove 5; the convex portion of the second reflective layer second unit 22 extends along the groove 5 of the second reflective layer second unit 22 to the outside of the second reflective layer second unit 22, the convex portion of the second reflective layer second unit 22 is equal to the convex portion of the first reflective layer first unit 11 in length, width and height, the concave portion of the second reflective layer second unit 22 is equal to the length, width and height of the convex portion of the second reflective layer second unit 22, so that the convex portion of the second reflective layer first unit 21 can be embedded in the concave portion of the second reflective layer second unit 22; as shown in Figure 6 The second reflective layer third unit 23 shown in the figure includes two recesses arranged on the side of the unit, and the two recesses are both rectangular parallelepiped grooves 5; the shape structure, length, width and depth of the two recesses are completely equal, and the length, width and depth of the two recesses of the second reflective layer third unit 23 are completely equal to the recess of the second reflective layer second unit 22, so that the convex portion of the second reflective layer first unit 21 and the convex portion of the second reflective layer second unit 22 can be embedded in the recess of the second reflective layer third unit 23.

[0097] Furthermore, the concave portions of the second reflective layer second unit 22 and the second reflective layer third unit 23 penetrate through one end surface of the second reflective layer second unit 22 and the second reflective layer third unit 23 , respectively.

[0098] Furthermore, if Figure 7, the three-dimensional structures of the third reflective layer first unit 31, the third reflective layer second unit 32 and the third reflective layer third unit 33 are respectively shown, and one end surface of the third reflective layer first unit 31, the third reflective layer second unit 32 and the third reflective layer third unit 33 each has a boss 6, and the bosses 6 on one end surface of the third reflective layer first unit 31, the third reflective layer second unit 32 and the third reflective layer third unit 33 are spliced ​​to form a concave structure of the first reflective layer 1.

[0099] Furthermore, if Figure 7 As shown in the figure, the third reflective layer first unit 31 includes two rectangular parallelepiped convex parts arranged on the side of the unit, and the shape structure, length, width and height of the two convex parts are completely equal. The convex part of the third reflective layer first unit 31 extends along the boss 6 of the third reflective layer first unit 31 to the outside of the third reflective layer first unit 31; Figure 7 As shown in the figure, the third reflective layer second unit 32 includes a concave portion and a convex portion arranged on the side of the unit, wherein the convex portion is a rectangular parallelepiped and the concave portion is a rectangular parallelepiped groove 5; the convex portion of the third reflective layer second unit 32 extends along the boss 6 of the third reflective layer second unit 32 to the outside of the third reflective layer second unit 32, the convex portion of the third reflective layer second unit 32 is equal to the convex portion of the first reflective layer first unit 11 in length, width and height, the concave portion of the third reflective layer second unit 32 is equal to the length, width and height of the convex portion of the third reflective layer second unit 32, and passes through one end surface of the third reflective layer first unit 31, so that the convex portion of the third reflective layer first unit 31 can be embedded in the concave portion of the third reflective layer second unit 32; as shown in the figure, the convex portion of the third reflective layer second unit 32 extends along the boss 6 of the third reflective layer second unit 32 to the outside of the third reflective layer second unit 32, the convex portion of the third reflective layer second unit 32 is equal to the convex portion of the first reflective layer first unit 11 in length, width and depth, the concave portion of the third reflective layer second unit 32 is equal to the length, width and height of the convex portion of the third reflective layer second unit 32, and passes through one end surface of the third reflective layer first unit 31, so that the convex portion of the third reflective layer first unit 31 can be embedded in the concave portion of the third reflective layer second unit 32; Figure 7 The third unit 33 of the third reflective layer shown in the figure includes two recesses arranged on the side of the unit, and the two recesses are both rectangular parallelepiped grooves 5; the shape structure, length, width and depth of the two recesses are completely equal, and the length, width and depth of the two recesses of the third reflective layer third unit 33 are completely equal to the recess of the third reflective layer second unit 32, so that the convex portion of the third reflective layer first unit 31 and the convex portion of the third reflective layer second unit 32 can be embedded in the recess of the third reflective layer third unit 33.

[0100] Furthermore, the concave portions of the third reflective layer second unit 32 and the third reflective layer third unit 33 penetrate through one end surface of the third reflective layer second unit 32 and the third reflective layer third unit 33 , respectively.

[0101] Further, the inner surface of the reflector device is designed in a tooth shape, and the tooth shape of the inner surface includes a plurality of ridges 4 arranged along the axis of the reflector device, and the ridge 4 includes a single-rib ridge 41 and a platform ridge 42. The end of the platform ridge 42 is a plane, which is located at a non-connected position of at least some units and is parallel to a plane with a larger area on the outer surface of the unit. The single-rib ridge 41 is located at a connected position of at least some units and is formed by splicing a part of adjacent units. The end of the single-rib ridge 41 is a single edge along the axial direction of the reflector device. Since the fuel assembly arranged inside the reflector device is in the shape of a regular hexagonal prism, after each reflector layer in this embodiment is assembled with a tooth shape composed of 6 units and the internal ridge 4, the cavity formed inside can be used to install 31 groups of fuel assemblies, which is compatible with the fuel assembly with a regular hexagonal prism bottom surface, and provides a compatible installation space for the fuel assembly.

[0102] Preferably, the material of the reflective layer device is graphite.

[0103] To achieve the above object, the present invention further provides a method for installing the above-mentioned gas-cooled reactor reflector device, comprising the following steps:

[0104] S1: Assembling the third reflective layer;

[0105] S2: assembling the second reflective layer and the first reflective layer according to the required height of the core;

[0106] S3: sequentially embedding and installing the second reflective layer and the first reflective layer on the end surface of the third reflective layer.

[0107] Furthermore, the step S1 includes:

[0108] like Figure 8 As shown in , the position of the third reflective layer first unit is determined and installed, the third reflective layer second unit is embedded into the third reflective layer first unit, and then the third reflective layer third unit is installed.

[0109] Furthermore, the step S2 includes:

[0110] The number of the second reflective layers 2 is obtained according to the height of the core, and the second reflective layers 2 are assembled according to the number.

[0111] Furthermore, the step S3 includes:

[0112] The second reflective layer 2 and the third reflective layer 3 are sequentially arranged at positions corresponding to the tooth shapes of the inner surfaces.

[0113] Further, the reflective layer method may be to first sequentially splice the second reflective layer first unit 21, the second reflective layer second unit 22, and the second reflective layer third unit 23 on the outside of the installed third reflective layer 3 to form the second reflective layer 2, and then install the second reflective layer 2 on the third reflective layer according to the tooth shape, and then install the first reflective layer 1 in the same way; or the second reflective layer first unit may be first fixed according to the tooth shape on the top of the installed third reflective layer 3, and then the second reflective layer second unit 22 and the second reflective layer third unit 23 may be sequentially installed, and the first reflective layer 1 may be installed in the same way.

[0114] In summary, it can be seen from the above description that the above embodiments of the present invention achieve the following technical effects:

[0115] 1. The present invention proposes a gas-cooled reactor reflector layer device and an installation method. By interlocking reflector layers of different structures to build a reflector layer device, the self-limitation of the structure is achieved, thereby significantly enhancing the stability and reliability of the side reflector layer. This design not only improves the strength of the structure and ensures the shape integrity of the core fuel assembly, but also improves the safety of reactor operation by reducing the risk of coolant leakage. The splicing design in the present invention simplifies the installation process, reduces installation costs and time, and makes maintenance and replacement of components in the device more convenient, thereby improving the maintainability of the reactor.

[0116] 2. The present invention proposes a gas-cooled reactor reflector layer device and an installation method. The units in the reflector layer all adopt a side reflector layer structure made of graphite material. Due to its high temperature resistance and radiation resistance, it is particularly suitable for the harsh working environment of a high-temperature gas-cooled reactor. At the same time, the high-strength support and restraint capabilities of graphite bricks ensure the stability of the core fuel assembly under high temperature and radiation. The mosaic structure of the present invention avoids the stress concentration problem that may be caused by traditional key and mortise connection methods, thereby reducing the risk of damage and further improving the safety and reliability of the reactor.

[0117] 3. The present invention proposes a reflector layer device for a gas-cooled reactor and an installation method, wherein a plurality of reflector layer structures can simultaneously constrain the core fuel assembly axially and circumferentially, and this bidirectional constraint effect significantly improves the constraint efficiency, reduces the risk of coolant leakage, and thus improves the operating safety of the reactor; the use of graphite material enables the side reflector layer structure to have better performance in high temperature and irradiation environments, and enhances the environmental adaptability of the reactor; the structural design of the reflector layer device also has good adaptability, and can adapt to prismatic high-temperature gas-cooled reactors of different scales and designs, providing important technical support for the development of high-temperature gas-cooled reactor technology.

[0118] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

[0119] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0120] It should be noted that, in the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction 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 may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

Claims

1. A gas-cooled reactor reflector device, characterized in that: The invention comprises a first reflective layer (1), a second reflective layer (2) and a third reflective layer (3), wherein one end surface of the first reflective layer (1) has a concave structure which is continuous in the circumferential direction, two end surfaces of the second reflective layer (2) respectively have a convex structure and a concave structure which are continuous in the circumferential direction, and one end surface of the third reflective layer (3) has a convex structure which is continuous in the circumferential direction; The concave structure of the first reflective layer (1) and the convex structure of the second reflective layer (2) can be arranged in a chimeric arrangement, and the concave structure of the second reflective layer (2) and the convex structure of the third reflective layer (3) can be arranged in a chimeric arrangement.

2. The device according to claim 1, characterized in that: The outer surface of the reflective layer device is a prism, and the first reflective layer (1), the second reflective layer (2) and the third reflective layer (3) are distributed from top to bottom along the axis of the reflective layer device.

3. The device according to claim 2, characterized in that: The inner surface of the reflective layer device is tooth-shaped, the tooth shape is composed of ridges (4) protruding from the inner surface, the ridges (4) are parallel to the axis of the reflective layer device, and the first reflective layer (1), the second reflective layer (2) and the third reflective layer (3) are arranged in a tooth-shaped manner corresponding to each other.

4. The device according to claim 1, characterized in that: The side surfaces of the concave structures of the first reflecting layer (1) and the second reflecting layer (2) are arranged parallel to the outer surfaces of the first reflecting layer (1) and the second reflecting layer (2); The side surfaces of the protruding structures of the second reflecting layer (2) and the third reflecting layer (3) are arranged parallel to the outer surfaces of the second reflecting layer (2) and the third reflecting layer (3).

5. The device according to claim 1, characterized in that: The ratio of the height to the width of the concave structures of the first reflecting layer (1) and the second reflecting layer (2) is in the range of 1.8-2.8, and the ratio of the height to the width of the convex structures of the second reflecting layer (2) and the third reflecting layer (3) is in the range of 1.0-2.

0.

6. The device according to claim 3, characterized in that: The first reflective layer (1) comprises a first reflective layer first unit (11), a plurality of first reflective layer second units (12) and a first reflective layer third unit (13) along the circumferential direction; the second reflective layer (2) comprises a second reflective layer first unit (21), a plurality of second reflective layer second units (22) and a second reflective layer third unit (23) along the circumferential direction; the third reflective layer (3) comprises a third reflective layer first unit (31), a plurality of third reflective layer second units (32) and a third reflective layer third unit (33) along the circumferential direction; the first reflective layer first unit (11) and the first reflective layer second unit (12) are interlockingly arranged; the plurality of first reflective layer second units (12) are interlockingly arranged; and the first reflective layer second unit (12) and the first reflective layer third unit (13) are interlockingly arranged; The second reflective layer first unit (21) and the second reflective layer second unit (22) are interlocked, a plurality of the second reflective layer second units (22) are interlocked, and the second reflective layer second unit (22) and the second reflective layer third unit (23) are interlocked; The third reflective layer first unit (31) and the third reflective layer second unit (32) are interlockingly arranged, a plurality of the third reflective layer second units (32) are interlockingly arranged, and the third reflective layer second unit (32) and the third reflective layer third unit (33) are interlockingly arranged.

7. The device according to claim 6, characterized in that: One end surface of the first reflective layer first unit (11), the first reflective layer second unit (12) and the first reflective layer third unit (13) all has a groove (5), and the grooves (5) are spliced ​​to form an inner concave structure of the first reflective layer.

8. The device according to claim 7, characterized in that: The first reflective layer first unit (11) includes a convex portion, the first reflective layer second unit (12) includes a convex portion and a concave portion, and the first reflective layer third unit (13) includes a concave portion. The convex parts of the first reflective layer first unit (11) are arranged on both sides of the first reflective layer first unit (11), and extend along the groove (5) of the first reflective layer first unit (11) to the outside of the first reflective layer first unit (11); The convex portion of the first reflective layer second unit (12) is arranged on one side of the first reflective layer second unit (12), and extends along the groove (5) of the first reflective layer second unit (12) to the outside of the first reflective layer second unit (12), and the concave portion of the first reflective layer second unit (12) and the convex portion of the first reflective layer first unit (11) are arranged to be embedded; The concave portion of the first reflective layer third unit (13) is arranged on both sides of the first reflective layer third unit (13), and can be embedded with the convex portion of the first reflective layer second unit (12); The concave portions of the first reflective layer second unit (12) and the first reflective layer third unit (13) respectively penetrate one end surface of the first reflective layer second unit (12) and the first reflective layer third unit (13).

9. The device according to claim 6, characterized in that: One end surface of the second reflective layer first unit (21), the second reflective layer second unit (22) and the second reflective layer third unit (23) all have a groove (5), and the other end surface all have a boss (6), the grooves (5) are spliced ​​to form a concave structure of the second reflective layer (2), and the bosses (6) are spliced ​​to form a convex structure of the second reflective layer (2).

10. The device according to claim 9, characterized in that: The second reflective layer first unit (21) comprises a convex portion, the second reflective layer second unit (22) comprises a convex portion and a concave portion, the second reflective layer third unit (23) comprises a concave portion, the convex portions of the second reflective layer first unit (21) are arranged on both sides of the second reflective layer first unit (21) and extend along the groove (5) of the second reflective layer first unit (21) to the outside of the second reflective layer first unit (21); The convex portion of the second reflecting layer second unit (22) is arranged on one side of the second reflecting layer second unit (22), and extends along the groove (5) of the second reflecting layer second unit (22) to the outside of the second reflecting layer second unit (22), and the concave portion of the second reflecting layer second unit (22) and the convex portion of the second reflecting layer first unit (21) are arranged to be embedded; The concave portion of the second reflective layer third unit (23) is arranged on both sides of the second reflective layer third unit (23), and is configured to be engageable with the convex portion of the second reflective layer second unit (22); The concave portions of the second reflective layer second unit (22) and the second reflective layer third unit (23) respectively penetrate one end surface of the second reflective layer second unit (22) and the second reflective layer third unit (23).

11. The device according to claim 6, characterized in that: One end surface of the third reflective layer first unit (31), the third reflective layer second unit (32) and the third reflective layer third unit (33) all has a boss (6), and the bosses (6) are spliced ​​to form a convex structure of the third reflective layer (3).

12. The device according to claim 11, characterized in that: The third reflective layer first unit (31) comprises a convex portion, the third reflective layer second unit (32) comprises a convex portion and a concave portion, the third reflective layer third unit (33) comprises a concave portion, and the convex portions of the third reflective layer first unit (31) are arranged on both sides of the third reflective layer first unit (31); The convex portion of the third reflective layer second unit (32) is arranged on one side of the third reflective layer second unit (32), and the concave portion of the third reflective layer second unit (32) and the convex portion of the third reflective layer first unit (31) are arranged to be embedded; The concave portion of the third unit (33) of the third reflective layer is arranged on both sides of the third unit (33) of the third reflective layer, and can be embedded with the convex portion of the second unit (32) of the third reflective layer; The concave portions of the third reflective layer second unit (32) and the third reflective layer third unit (33) respectively penetrate one end surface of the third reflective layer second unit (32) and the third reflective layer third unit (33).

13. The device according to claim 6, characterized in that: The ridge (4) comprises a single-rib ridge (41) and a platform ridge (42); the single-rib ridge (41) is located at a connection position of at least some units in the reflective layer device; the platform ridge (42) is located at a non-connection position of at least some units; and the single-rib ridge (41) is formed by splicing a part of adjacent units.

14. The device according to claim 1, characterized in that: The reflective layer device comprises a first reflective layer (1), a plurality of second reflective layers (2) and a third reflective layer (3).

15. The device according to claim 14, characterized in that: The concave structures and convex structures between the plurality of second reflective layers (2) can be arranged in an interlocking manner.

16. The device according to claim 1, characterized in that: The material of the reflective layer device is graphite.

17. A method for installing a reflective layer device for a gas-cooled reactor according to any one of claims 1 to 16, characterized in that: include: S1: Assembling the third reflective layer (3); S2: assembling the second reflective layer (2) and the first reflective layer (1) according to the required height of the core; S3: The second reflective layer (2) and the first reflective layer (1) are sequentially embedded and installed on the end surface of the third reflective layer (3).

18. The method according to claim 17, characterized in that: The step S1 includes: Firstly, the position of the first unit (31) of the third reflective layer is determined and installed, the second unit (32) of the third reflective layer is embedded into the first unit (31) of the third reflective layer, and then the third unit (33) of the third reflective layer is installed.

19. The method according to claim 17, characterized in that: The step S2 includes: The number of the second reflective layers (2) is obtained according to the height of the core, and the second reflective layers (2) are assembled according to the number.

20. The method according to claim 17, characterized in that: The step S3 includes: The second reflective layer (2) and the third reflective layer (3) are arranged in sequence at positions corresponding to the tooth shapes of the inner surfaces.

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