A reactor internals applicable to an ocean nuclear power platform

Abstract

The present invention relates to an in-core structure applicable to a marine nuclear power platform, which comprises: a cylinder body, an in-core structure is arranged inside the cylinder body, and the in-core structure is supported by the cylinder body; a compression elastic ring, which is supported on the top of the in-core structure and is located inside the cylinder body, and the compression elastic ring can be compressed along the axial direction of the cylinder body; and a top cover, which is installed on the top of the cylinder body, and the bottom of the top cover abuts against the compression elastic ring to generate a pre-tightening force along the axial direction of the cylinder body on the compression elastic ring. For the in-core structure applicable to a marine nuclear power platform according to the present invention, the pre-tightening force of the compression elastic ring can act on the in-core structure. The compression elastic ring can compensate for the machining and assembly errors of the in-core structure, and can also compensate for the axial displacement of the in-core structure under temperature difference and the additional force that may be generated by hydraulic shock, and provide sufficient pressing force for the in-core structure.

Description

Technical Field

[0001] The present invention relates to the technical field of safety facilities for nuclear power plants, and particularly relates to a reactor internals suitable for a marine nuclear power platform. Background Art

[0002] A marine nuclear power platform is a floating nuclear power plant at sea, which can provide long-term, efficient and safe power supply for undeveloped islands in vast sea areas, offshore drilling platforms, subsea exploration and deep-sea exploration workstations, etc.

[0003] In related technologies, a marine nuclear power platform has a reactor pressure vessel containing nuclear fuel. Generally, reactor internals are provided in the reactor pressure vessel to accommodate and support the reactor core. The reactor internals are combined with equipment such as the reactor pressure vessel, control rod drive mechanisms, fuel assemblies and their related components to achieve the reactor function. However, due to processing and assembly errors generally existing in the process of machining and assembling the reactor internals, the reactor internals cannot provide sufficient pressing force in the reactor pressure vessel.

[0004] Therefore, it is necessary to design a new reactor internals suitable for a marine nuclear power platform to overcome the above problems. Summary of the Invention

[0005] Embodiments of the present invention provide a reactor internals suitable for a marine nuclear power platform to solve the problem that in the related technologies, processing and assembly errors exist in the process of machining and assembling the reactor internals, resulting in the reactor internals not being able to provide sufficient pressing force in the reactor pressure vessel.

[0006] In a first aspect, there is provided a reactor internals suitable for a marine nuclear power platform, which includes: a cylinder body, in which reactor internals are provided, and the reactor internals are supported by the cylinder body; a pressing elastic ring, which is supported on the top of the reactor internals and is located inside the cylinder body, and the pressing elastic ring can be compressed along the axial direction of the cylinder body; and a top cover, which is installed on the top of the cylinder body, and the bottom of the top cover abuts against the pressing elastic ring to generate a pre-tightening force along the axial direction of the cylinder body on the pressing elastic ring.

[0007] In some embodiments, the pressing elastic ring includes: a lower ring, which abuts against the reactor internals; a middle ring, which is located above the lower ring, and one side of the middle ring is in contact with the lower ring; and an upper ring, which is in contact with the top cover and the other side of the middle ring, and there is a gap between the upper ring and the lower ring.

[0008] In some embodiments, the upper ring has a first inclined surface, the lower ring has a second inclined surface, and the inclination direction of the second inclined surface is opposite to that of the first inclined surface; the middle ring has a third inclined surface that fits with the first inclined surface and a fourth inclined surface that fits with the second inclined surface.

[0009] In some embodiments, the top cover abuts directly above the first inclined surface.

[0010] In some embodiments, the lower ring is provided with threaded holes, the upper ring is provided with through holes corresponding to the threaded holes, and the inner diameter of the through holes is greater than the inner diameter of the threaded holes; the pressing elastic ring further includes screws passing through the through holes, the screws are threadedly connected to the threaded holes, and the screws have heads that abut against the upper ring, and the heads are located within the through holes.

[0011] In some embodiments, the cylinder body is provided with a first convex block and a second convex block, and the first convex block and the second convex block are arranged at intervals; the outer side of the lower ring is provided with a first key groove for receiving the first convex block and a second key groove for receiving the second convex block, the widths of the first key groove and the second key groove are different, the numbers of the first key groove and the second key groove are different, or the first key groove and the second key groove are asymmetrically arranged with respect to the axis of the lower ring.

[0012] In some embodiments, at least two lifting assemblies are provided on the inner side of the lower ring, and the two lifting assemblies are symmetrically arranged at intervals within the lower ring.

[0013] In some embodiments, the materials of the upper ring and the lower ring are both made of austenitic stainless steel, and the material of the middle ring is made of Inconel alloy or martensitic stainless steel.

[0014] In some embodiments, a groove is provided at the bottom of the top cover, and an elastic member is received in the groove, and the elastic member is clamped between the top cover and the pressing elastic ring.

[0015] In some embodiments, a support step is provided within the cylinder body, the in-core structure includes an upper in-core structure and a lower in-core structure, the lower in-core structure is supported on the support step, the upper in-core structure is supported on the lower in-core structure, and the pressing elastic ring is clamped between the upper in-core structure and the top cover.

[0016] The beneficial effects brought by the technical solution provided by the present invention include:

[0017] An embodiment of the present invention provides a reactor internals applicable to a marine nuclear power platform. Since a compression elastic ring is provided between the reactor internals and the top cover, when the top cover is installed on the cylinder body, the top cover abuts against the compression elastic ring, applying a pre-tightening force in the axial direction to the compression elastic ring. This pre-tightening force can act on the reactor internals, and the compression elastic ring can be compressed in the axial direction, enabling the compression elastic ring to compensate for the machining and assembly errors of the reactor internals, and also compensating for the axial displacement of the reactor internals under temperature difference and the additional force that may be generated by hydraulic shock, providing sufficient pressing force for the reactor internals. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0019] Figure 1 FIG. is a partial structural schematic diagram of a reactor internals applicable to a marine nuclear power platform provided by an embodiment of the present invention;

[0020] Figure 2 FIG. is a sectional view schematic diagram of the compression elastic ring provided by an embodiment of the present invention;

[0021] Figure 3 FIG. is a top view schematic diagram of the compression elastic ring provided by an embodiment of the present invention;

[0022] Figure 4 FIG. is a partial sectional view schematic diagram of the compression elastic ring provided by an embodiment of the present invention.

[0023] In the figure:

[0024] 1. Cylinder body; 11. Support step;

[0025] 2. Reactor internals; 21. Upper reactor internals; 22. Lower reactor internals;

[0026] 3. Compression elastic ring; 31. Lower ring; 311. Second inclined surface; 312. Threaded hole; 313. First keyway; 314. Second keyway; 32. Middle ring; 321. Third inclined surface; 322. Fourth inclined surface; 33. Upper ring; 331. First inclined surface; 332. Through hole; 34. Screw; 341. Head; 35. Lifting assembly;

[0027] 4. Top cover; 5. Elastic member. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are only a part rather than all of the 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 shall fall within the scope of protection of the present invention.

[0029] An embodiment of the present invention provides a reactor internals applicable to a marine nuclear power platform, which can solve the problem in the related art that during the processing, manufacturing, or assembly of the reactor internals, there are processing and assembly errors, resulting in the reactor internals being unable to provide sufficient pressing force within the reactor pressure vessel.

[0030] See Figure 1 As shown, a reactor internals applicable to a marine nuclear power platform provided by an embodiment of the present invention may include: a cylinder 1, in which a reactor internals 2 is provided, and the reactor internals 2 is supported by the cylinder 1. Among them, the main functions of the reactor internals 2 are generally: providing support, positioning, and guidance for the fuel assembly and related components, guiding the primary coolant to flow through the reactor core and reasonably distributing the flow rate, transferring the dynamic load of the control rod, the load of the fuel assembly, and other loads to the cylinder 1, providing a suitable-sized environment for the shielding water layer together with the cylinder 1, reducing the damage of the pressure vessel caused by thermal neutrons and γ-ray irradiation, etc.; a pressing elastic ring 3, which is supported on the top of the reactor internals 2 and is located within the cylinder 1. The pressing elastic ring 3 can be compressed along the axial direction of the cylinder 1. That is to say, the pressing elastic ring 3 can be annular and is arranged along the inner edge of the cylinder 1. The pressing elastic ring 3 can be made of an elastic material, so that the pressing elastic ring 3 as a whole has elasticity and can be compressed in the axial direction. The pressing elastic ring 3 can also be made of a non-elastic material, and the structure of the pressing elastic ring 3 can be designed to be able to be compressed and deformed in the axial direction; and a top cover 4, which can be installed on the top of the cylinder 1, and the bottom of the top cover 4 abuts against the pressing elastic ring 3, causing the pressing elastic ring 3 to generate a pre-tightening force along the axial direction of the cylinder 1. That is to say, when the top cover 4 is fixed to the cylinder 1, the top cover 4 will contact the pressing elastic ring 3. At the same time, the top cover 4 will also apply a pre-tightening force downward along the axial direction to the pressing elastic ring 3, so that the pressing elastic ring 3 acts the pre-tightening load on the reactor internals 2. Among them, the top cover 4 and the cylinder 1 can be fixed by bolts. By tightening the bolts, it is ensured that sufficient pre-tightening force is applied to the pressing elastic ring 3.

[0031] See Figure 2 and Figure 4As shown, in some embodiments, the pressing elastic ring 3 may include: a lower ring 31. The lower ring 31 is annular, and the lower ring 31 abuts against the upper surface of the in-pile component 2. The upper surface of the in-pile component 2 may have a horizontal mounting surface. The lower ring 31 is placed on the mounting surface and fits with the mounting surface to ensure the stability and sealing performance of the contact between the lower ring 31 and the in-pile component 2; a middle ring 32, which may be located above the lower ring 31, and one side of the middle ring 32 contacts the lower ring 31. Specifically, the lower side of the middle ring 32 contacts the lower ring 31; and an upper ring 33. The upper ring 33 may contact the top cover 4, and the upper ring 33 contacts the other side of the middle ring 32, that is, the upper side of the middle ring 32. The middle ring 32 is clamped between the lower ring 31 and the upper ring 33. There may be a gap between the upper ring 33 and the lower ring 31, that is, the upper ring 33 and the lower ring 31 may be spaced apart. Of course, in other embodiments, when the upper ring 33 and the lower ring 31 are made of elastic materials (such as rubber), there may be no gap between the upper ring 33 and the lower ring 31. In this embodiment, the upper ring 33 and the lower ring 31 may be made of elastic materials or non-elastic materials. Since the middle ring 32 is provided between the upper ring 33 and the lower ring 31, the middle ring 32 can support the upper ring 33, so that a gap is formed between the upper ring 33 and the lower ring 31. This gap can provide space for the compression deformation of the upper ring 33 or the lower ring 31. When the pressing elastic ring 3 is installed on the in-pile component 2, and due to other factors such as processing or assembly, the upper surface of the upper ring 33 exceeds the preset height, the top cover 4 abuts against the surface of the upper ring 33, and can compress the upper ring 33 downward, causing the upper ring 33 to move downward, and the gap between the upper ring 33 and the lower ring 31 to shrink, so as to ensure that the top cover 4 can be smoothly installed on the cylinder 1 without being lifted, and to ensure that after the top cover 4 is installed, a pre-tightening force can be applied to the pressing elastic ring 3, while meeting the functional requirements of the reactor of the marine nuclear power platform. In this embodiment, the value range of the gap is preferably 5 mm to 10 mm.

[0032] See Figure 4As shown, in some alternative embodiments, the upper ring 33 may have a first inclined surface 331, and the lower ring 31 may have a second inclined surface 311. The inclination direction of the second inclined surface 311 is opposite to that of the first inclined surface 331. Specifically, the first inclined surface 331 may be inclined downward and toward the axis of the upper ring 33. Correspondingly, the second inclined surface 311 may be inclined downward and away from the axis of the upper ring 33. Of course, the first inclined surface 331 may also be inclined downward and away from the axis of the upper ring 33. Correspondingly, the second inclined surface 311 is correspondingly inclined downward and toward the axis of the upper ring 33, so that the inclination directions of the first inclined surface 331 and the second inclined surface 311 are opposite. The middle ring 32 has a third inclined surface 321 that fits with the first inclined surface 331 and a fourth inclined surface 322 that fits with the second inclined surface 311. That is, the third inclined surface 321 may be the upper surface of the middle ring 32, and the fourth inclined surface 322 may be the lower surface of the middle ring 32. By providing the third inclined surface 321 that matches the upper ring 33 and the fourth inclined surface 322 that matches the lower ring 31, the middle ring 32 can stably support the upper ring 33 on the lower ring 31. At the same time, the downward pre-tightening force applied by the top cover 4 can be decomposed into a component force along the third inclined surface 321 on the third inclined surface 321, and this component force is conducive to driving the upper ring 33 to compress and deform downward along the inclination direction of the third inclined surface 321. Preferably, the inclination angles of the first inclined surface 331 and the second inclined surface 311 are the same, and the value range of the angle is preferably 30° to 60°. The cross-sectional shape of the middle ring 32 may be an isosceles trapezoid or a triangle, etc.

[0033] See Figure 1 and Figure 4 As shown, in some embodiments, the top cover 4 preferably abuts directly above the first inclined surface 331. That is, the first inclined surface 331 may be provided near the outer edge of the upper ring 33, or may be provided near the inner edge of the upper ring 33, or may also be provided at a certain position between the outer edge and the inner edge of the upper ring 33. When the first inclined surface 331 is provided near the outer edge of the upper ring 33, the top cover 4 correspondingly abuts at the outer edge of the upper ring 33 and is correspondingly located directly above the first inclined surface 331. With such a setting, the pre-tightening force applied by the top cover 4 on the upper ring 33 can act vertically downward directly on the middle ring 32, and the middle ring 32 then transmits the pre-tightening force to the lower ring 31. The loss of the pre-tightening force applied by the top cover 4 when transmitted to the in-core structure 2 is relatively small.

[0034] See Figure 4As shown, in some alternative embodiments, the lower ring 31 may be provided with a threaded hole 312, and the upper ring 33 is provided with a through hole 332 corresponding to the threaded hole 312. Among them, the through hole 332 may have a smooth inner wall, and the inner diameter of the through hole 332 is preferably larger than the inner diameter of the threaded hole 312; the pressing elastic ring 3 may further include a screw 34 passing through the through hole 332, the screw 34 is threadedly connected to the threaded hole 312, and the screw 34 has a head 341 that abuts against the upper ring 33, and the head 341 is located within the through hole 332. That is, a step may be provided within the through hole 332, and the head 341 is blocked above the step to prevent the upper ring 33 from moving upward. The head 341 is located at the upper end of the screw 34, and the lower end of the screw 34 is threadedly connected to the threaded hole 312. By providing the screw 34 and the through hole 332, the screw 34 can connect the upper ring 33 and the lower ring 31 together, and the through hole 332 ensures that the upper ring 33 can move downward relative to the lower ring 31, and the head 341 ensures the maximum distance between the upper ring 33 and the lower ring 31. When the step of the upper ring 33 contacts the head 341, the upper ring 33 will not move further upward.

[0035] Further, referring to Figure 3As shown, in some embodiments, the cylinder body 1 may be provided with a first convex block and a second convex block, and the first convex block and the second convex block are arranged at intervals. Preferably, three first convex blocks and one second convex block may be provided, and the first convex blocks and the second convex block are evenly arranged along the circumference of the cylinder body 1. The widths of the first convex block and the second convex block may be different. On the outer side of the lower ring 31, a first key groove 313 for receiving the first convex block and a second key groove 314 for receiving the second convex block may be provided. Among them, the first key groove 313 and the second key groove 314 may be formed by being recessed from the outer edge of the lower ring 31 towards its interior, or key groove blocks may be protruded outward from the outer edge of the lower ring 31, and the first key groove 313 and the second key groove 314 are provided on the key groove blocks. Among them, the widths of the first key groove 313 and the second key groove 314 may be different. When the lower ring 31 is installed on the cylinder body 1, the first convex block is correspondingly inserted into the first key groove 313, and the second convex block is correspondingly inserted into the second key groove 314. The number of the first key groove 313 and the second key groove 314 is different, or the first key groove 313 and the second key groove 314 are asymmetrically arranged with respect to the axis of the lower ring 31. That is to say, three first key grooves 313 may be provided and one second key groove 314 may be provided, ensuring that when the lower ring 31 is installed downward, the second convex block can only be correspondingly inserted into the second key groove 314, which can prevent the lower ring 31 from being installed in the wrong position. Of course, the number of the first key groove 313 and the second key groove 314 may also be set to be the same. For example, both may be set to two, and the arrangement positions of the two first key grooves 313 and the two second key grooves 314 on the lower ring 31 need to be set asymmetrically, which is also to prevent the lower ring 31 from being installed in the wrong position. At the same time, the first convex block and the second convex block can also position and guide the lower ring 31.

[0036] See Figure 2 and Figure 3 As shown, in some alternative embodiments, at least two lifting components 35 may be provided on the inner side of the lower ring 31, and the two lifting components 35 are symmetrically arranged at intervals within the lower ring 31. In this embodiment, preferably 3 lifting components 35 are provided. The lifting components 35 are fixed on the inner edge of the lower ring 31, and the 3 lifting components 35 are evenly arranged. By providing the lifting components 35, it is convenient for the installation and lifting of the pressing elastic ring 3 of the refueling device, and it also meets the interface requirements between the pressing elastic ring 3 and the cylinder body 1.

[0037] See Figure 1 As shown, in some embodiments, since the pressing elastic ring 3 works under the conditions of high temperature, high pressure and high irradiation, the selected material must be resistant to high temperature, high pressure and irradiation, and have corrosion resistance. The materials of the upper ring 33 and the lower ring 31 are both made of austenitic stainless steel, such as 321 or 304L, and the material of the middle ring 32 is made of Inconel alloy 718 or SA-182F6NM martensitic stainless steel.

[0038] See Figure 1 As shown, in some alternative embodiments, a groove may be provided at the bottom of the top cover 4. The groove communicates with the interior of the cylinder body 1. An elastic member 5 is received in the groove. The elastic member 5 is clamped between the top cover 4 and the pressing elastic ring 3. Specifically, a part of the elastic member 5 is clamped between the cylinder body 1 and the top cover 4, and a part of the elastic member 5 extends out of the groove and is clamped between the pressing elastic member 5 and the top cover 4, so that the elastic member 5 forms a primary seal between the pressing elastic member 5 and the top cover 4 and a secondary seal between the cylinder body 1 and the top cover 4, fully ensuring the sealing performance inside the cylinder body 1.

[0039] See Figure 1 As shown, further, a support step 11 may be provided inside the cylinder body 1. The in-core structure 2 may include an upper in-core structure 21 and a lower in-core structure 22. The lower in-core structure 22 is supported on the support step 11. The upper in-core structure 21 is supported on the lower in-core structure 22. And the pressing elastic ring 3 is clamped between the upper in-core structure 21 and the top cover 4. Different from land-based nuclear power plants, the pressing elastic ring 3 is arranged on the upper surface of the upper in-core structure 21, which can avoid the change of the position of the core active area caused by the pre-tightening compression of the pressing elastic ring 3.

[0040] The principle of a reactor in-core structure applicable to a marine nuclear power platform provided by an embodiment of the present invention is as follows:

[0041] Since a pressing elastic ring 3 is provided between the in-core structure 2 and the top cover 4, when the top cover 4 is installed on the cylinder body 1, the top cover 4 will abut against the pressing elastic ring 3 and apply a pre-tightening force downward along the axial direction to the pressing elastic ring 3. This pre-tightening force can act on the in-core structure 2, and the pressing elastic ring 3 can be compressed in the axial direction, so that the pressing elastic ring 3 can compensate for the machining and assembly errors of the in-core structure 2, and can also compensate for the axial displacement of the in-core structure 2 under temperature difference and the additional force that may be generated by hydraulic shock, providing sufficient pressing force for the in-core structure 2, which can not only meet the functional requirements of the reactor of the marine nuclear power platform but also adapt to the particularity of the marine environment. Since the pressing elastic ring 3 is arranged between the top cover 4 and the in-core structure 2, that is, on the upper surface of the in-core structure 2, it can avoid the change of the position of the core active area inside the cylinder body 1 caused by the pre-tightening compression of the pressing elastic ring 3.

[0042] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by terms such as "upper" and "lower" is based on the orientation or positional relationship shown in the drawings. It is 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. Therefore, it should not be construed as a limitation to the present invention. Unless otherwise clearly specified and defined, the terms "installed", "connected" and "coupled" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0043] It should be noted that in the present invention, relative terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the process, method, article or device comprising the element.

[0044] The above are only specific embodiments of the present invention, enabling those skilled in the art to understand or implement the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown herein, but rather to the broadest scope consistent with the principles and novel features claimed herein.

Claims

1. A reactor internals applicable to a marine nuclear power platform, characterized in that, It includes: A cylinder body (1), in which an in-core structure (2) is arranged, and the in-core structure (2) is supported by the cylinder body (1); A compression elastic ring (3), which is supported on the top of the in-core structure (2), and the compression elastic ring (3) is located inside the cylinder body (1), and the compression elastic ring (3) can be compressed along the axial direction of the cylinder body (1); And a top cover (4), the top cover (4) is installed on the top of the cylinder body (1), and the bottom of the top cover (4) abuts against the compression elastic ring (3), so that the compression elastic ring (3) generates a pre-tightening force along the axial direction of the cylinder body (1); The compression elastic ring (3) includes: A lower ring (31), the lower ring (31) abuts against the in-core structure (2); A middle ring (32), which is located above the lower ring (31), and one side of the middle ring (32) is in contact with the lower ring (31); And an upper ring (33), the upper ring (33) is in contact with the top cover (4), and the upper ring (33) is in contact with the other side of the middle ring (32), and there is a gap between the upper ring (33) and the lower ring (31); The upper ring (33) has a first inclined surface (331), the lower ring (31) has a second inclined surface (311), and the inclination direction of the second inclined surface (311) is opposite to that of the first inclined surface (331); The middle ring (32) has a third inclined surface (321) that fits with the first inclined surface (331), and a fourth inclined surface (322) that fits with the second inclined surface (311).

2. The in-core structure of the reactor applicable to the marine nuclear power platform according to claim 1, characterized in that: The top cover (4) abuts directly above the first inclined surface (331).

3. The in-core structure of the reactor applicable to the marine nuclear power platform according to claim 1, characterized in that: The lower ring (31) is provided with a threaded hole (312), the upper ring (33) is provided with a through hole (332) corresponding to the threaded hole (312), and the inner diameter of the through hole (332) is larger than the inner diameter of the threaded hole (312); The compression elastic ring (3) further includes a screw (34) passing through the through hole (332), the screw (34) is threadedly connected to the threaded hole (312), and the screw (34) has a head (341) that abuts against the upper ring (33), and the head (341) is located inside the through hole (332).

4. The in-core structure of the reactor applicable to the marine nuclear power platform according to claim 1, characterized in that: The cylinder body (1) is provided with a first convex block and a second convex block, and the first convex block and the second convex block are arranged at intervals; The outer side of the lower ring (31) is provided with a first key groove (313) for accommodating the first convex block and a second key groove (314) for accommodating the second convex block, and the widths of the first key groove (313) and the second key groove (314) are different, The number of the first key groove (313) and the second key groove (314) is different or the first key groove (313) and the second key groove (314) are asymmetrically arranged about the axis of the lower ring (31).

5. The in-core structure of the reactor applicable to the marine nuclear power platform according to claim 1, characterized in that: At least two lifting assemblies (35) are provided on the inner side of the lower ring (31), and the two lifting assemblies (35) are arranged at intervals and symmetrically within the lower ring (31).

6. The in-core structure of the reactor applicable to the marine nuclear power platform according to claim 1, characterized in that: The materials of the upper ring (33) and the lower ring (31) are both made of austenitic stainless steel, and the material of the middle ring (32) is made of Inconel alloy or martensitic stainless steel.

7. The in-core structure of the reactor applicable to the marine nuclear power platform according to claim 1, characterized in that: A groove is provided at the bottom of the top cover (4), and an elastic member (5) is received in the groove, and the elastic member (5) is clamped between the top cover (4) and the compression elastic ring (3).

8. The in-core structure of the reactor applicable to the marine nuclear power platform according to claim 1, wherein: A support step (11) is provided inside the cylinder body (1), The in-core structure (2) includes an upper in-core structure (21) and a lower in-core structure (22), the lower in-core structure (22) is supported on the support step (11), the upper in-core structure (21) is supported on the lower in-core structure (22), and the compression elastic ring (3) is clamped between the upper in-core structure (21) and the top cover (4).

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