Nuclear reactor fuel assembly

Abstract

The embodiment of the present application provides a reactor fuel assembly which can be locked in a core support part in a reactor, and the reactor fuel assembly comprises a reactor fuel assembly body, a locking part, a stop part and a locking device; the locking part is fixedly connected with the reactor fuel assembly body through the stop part; wherein the core support part is provided with a through hole, when the reactor fuel assembly is locked in the core support part, the locking part passes through the through hole, the locking device is sleeved on the part of the locking part which passes through the through hole, and the core support part limits the axial movement of the reactor fuel assembly through the locking device and the stop part, so as to lock the reactor fuel assembly in the core support part. The reactor fuel assembly provided by the embodiment of the present application is provided with the locking device, and can ensure that the reactor fuel assembly is detachably installed in the reactor while preventing the reactor fuel assembly from floating up.

Description

Technical Field

[0001] Embodiments of the present invention relate to the field of reactors, and more specifically to a reactor fuel assembly. Background Technology

[0002] Reactor fuel assemblies are submerged in coolant during reactor operation. With technological advancements, some reactors have begun using coolants with higher densities, such as liquid lead-bismuth alloys and liquid lead metal. These coolants have a higher density than the reactor fuel assemblies, causing them to float. Summary of the Invention

[0003] In view of the above problems, embodiments of the present invention provide a reactor fuel assembly capable of being locked within a core support portion of a reactor. The reactor fuel assembly includes: a reactor fuel assembly body, a locking portion, a stop portion, and a locking device. The locking portion is fixedly connected to the reactor fuel assembly body via the stop portion. The core support portion has a through hole. When the reactor fuel assembly is locked within the core support portion, the locking portion passes through the through hole, and the locking device is sleeved on the portion of the locking portion extending through the through hole. The core support portion, through the locking device and the stop portion, limits the axial movement of the reactor fuel assembly, thereby locking the reactor fuel assembly within the core support portion.

[0004] The reactor fuel assembly provided in the embodiments of the present invention has a locking device that can prevent the reactor fuel assembly from floating up while ensuring that the reactor fuel assembly is detachably installed in the reactor. Attached Figure Description

[0005] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0006] Figure 1 This is a schematic diagram of the reactor fuel assembly being locked in the core support according to an embodiment of the present invention;

[0007] Figure 2 This is a schematic diagram of the reactor fuel assembly being locked in the core support according to an embodiment of the present invention;

[0008] Figure 3 This is a schematic diagram of the reactor fuel assembly being locked in the core support according to an embodiment of the present invention;

[0009] Figure 4 This is a schematic diagram of the reactor fuel assembly being locked in the core support according to an embodiment of the present invention;

[0010] Figure 5 This is a schematic diagram of the locking process of the reactor fuel assembly according to an embodiment of the present invention;

[0011] Figure 6 This is a schematic diagram of the limiting shaft of the reactor fuel assembly according to an embodiment of the present invention;

[0012] Figure 7 This is a schematic diagram of a locking device for reactor fuel assemblies according to an embodiment of the present invention;

[0013] Figure 8 This is a schematic diagram of a locking device for reactor fuel assemblies according to an embodiment of the present invention;

[0014] Figure 9 This is a schematic diagram of a locking device for reactor fuel assemblies according to an embodiment of the present invention;

[0015] Figure 10 This is a schematic diagram of a reactor fuel assembly unlocking device according to an embodiment of the present invention;

[0016] Figure 11 This is a schematic diagram of a reactor fuel assembly unlocking device according to an embodiment of the present invention.

[0017] It should be noted that the accompanying drawings are not necessarily drawn to scale, but are shown only in a schematic manner that does not affect the understanding of those skilled in the art. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] It should be noted that, unless otherwise defined, the technical or scientific terms used in this application should have the ordinary meaning understood by a person with ordinary skill in the art to which this application pertains. Where the terms "first," "second," etc., are used throughout the text, they are used only to distinguish similar objects and should not be construed as indicating or implying their relative importance, order of precedence, or implicitly specifying the number of technical features indicated. It should be understood that the data described by "first," "second," etc., can be interchanged where appropriate. Where "and / or" appears throughout the text, it means including three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or a solution that satisfies both A and B. Furthermore, for ease of description, spatial relative terms such as "above," "below," "top," and "bottom" may be used here, only to describe the spatial positional relationship between one device or feature as shown in the figure and other devices or features. It should be understood that this also includes different orientations in use or operation besides those shown in the figure.

[0020] See Figures 1-4 An embodiment of the present invention provides a reactor fuel assembly 100, which can be locked within a core support 200 in a reactor. The reactor fuel assembly 100 includes a reactor fuel assembly body 10, a locking part 30, a stop part 20, and a locking device 40. The locking part 30 is fixedly connected to the reactor fuel assembly body 10 via the stop part 20. The core support 200 has a through hole. When the reactor fuel assembly 100 is locked within the core support 200, the locking part 30 passes through the through hole, and the locking device 40 is sleeved on the portion of the locking part 30 that extends through the through hole. The core support 200 limits the axial movement of the reactor fuel assembly 100 through the locking device 40 and the stop part 20, thereby locking the reactor fuel assembly 100 within the core support 200.

[0021] The reactor fuel assembly 100 provided in the embodiments of the present invention is equipped with a locking device 40, which can prevent the reactor fuel assembly 100 from floating up while ensuring that the reactor fuel assembly 100 is detachably installed in the reactor.

[0022] The core support 200 is a structure within the reactor used to install the reactor fuel assembly 100, and the core support 200 is fixedly connected to the reactor body. By locking the reactor fuel assembly 100 to the core support 200, the reactor fuel assembly 100 can be fixed to the reactor body.

[0023] The reactor fuel assembly body 10 may include an outer sleeve, which may be a hexagonal thin-walled tube. Multiple fuel rods are disposed inside the outer sleeve, and coolant flow channels are formed between the fuel rods.

[0024] The reactor fuel assembly 100 includes a locking part 30, which is fixedly connected to one end of the reactor fuel assembly body 10 via a stop part 20. The locking part 30 and the reactor fuel assembly body 10 are coaxially arranged, and the diameter of the locking part 30 can be set to be smaller than the diameter of the reactor fuel assembly body 10. The locking part 30 may also have a coolant inlet, through which coolant enters the reactor fuel assembly body 10 and exchanges heat with the fuel rods. A helical spring may also be fixedly installed on the locking part 30 to reduce the flow rate of coolant into the reactor fuel assembly 100.

[0025] The core support portion 200 is provided with a through hole whose shape and size match the locking portion 30 of the reactor fuel assembly 100. The dimensions of the stop portion 20 and the locking device 40 are larger than the through hole, preventing the stop portion 20 and the locking device 40 from passing through the through hole of the core support portion 200. When the reactor fuel assembly 100 is fixed to the core support portion 200, the locking portion 30 is inserted into and passes through the through hole of the core support portion 200, and the locking device 40 is fitted onto the portion of the locking portion 30 that protrudes from the through hole and locked in a designated position. The buoyancy force experienced by the reactor fuel assembly 100 in the reactor is parallel to the axial direction of the reactor fuel assembly 100. The stop portion 20 and the locking device 40 restrict the movement of the reactor fuel assembly 100 along its axial direction, thereby achieving the locking of the reactor fuel assembly 100 and preventing the reactor fuel assembly 100 from floating under the buoyancy of the coolant.

[0026] As can be understood from the above description, the reactor fuel assembly 100 provided in the embodiments of the present invention can lock or unlock the reactor fuel assembly 100 and the core support 200 by only operating the locking device 40 when installing or disassembling the reactor fuel assembly 100, thereby simplifying the operation process and making the installation or disassembly of the reactor fuel assembly 100 simpler.

[0027] See Figures 5-8 In some embodiments, the locking device 40 is an annular structure with a locking groove 411 on its inner side; the locking part 30 is provided with a locking protrusion 31, which can enter the locking groove 411 to fix the locking device 40 in a designated position on the locking part 30. Through the cooperation of the locking groove 411 and the locking protrusion 31, the locking device 40 is fixed in a designated position on the locking part 30 to achieve the locking of the reactor fuel assembly 100.

[0028] In some embodiments, the locking groove 411 includes a guide section 4111, a rotating section 4112, and a fixing section 4113; the guide section 4111 and the rotating section 4112 are arranged vertically, and the end of the guide section 4111 communicates with the end of the rotating section 4112; the rotating section 4112 and the fixing section 4113 are arranged vertically, and the other end of the rotating section 4112 communicates with the middle of the fixing section 4113, so as to form a locking recess 41131 at the end of the fixing section 4113. Different portions of the locking groove 411 extend in different directions, and the locking recess 41131 limits the locking protrusion 31, so that the locking part 30 can be reliably fixed together with the locking device 40.

[0029] See Figure 8During the process of fixing the locking device 40 in the designated position of the locking part 30, the locking protrusion 31 enters the guide section 4111 from position 1 along the first direction; when the locking protrusion 31 reaches the communication position (position 2) between the guide section 4111 and the rotating section 4112, it enters the rotating section 4112 along the second direction perpendicular to the first direction; when the locking protrusion 31 reaches the communication position (position 3) between the rotating section 4112 and the fixed section 4113, it enters the fixed section 4113 along the third direction opposite to the first direction, and finally enters the locking recess 41131 (position 4).

[0030] See Figures 5-9 In some embodiments, the locking device 40 includes a lock body 41, a lock cover 42, and a limiting shaft 43. A locking groove 411 is formed on the lock body 41, and the lock body 41 also forms a limiting channel 412, which extends axially along the locking device 40. The limiting shaft 43 is partially disposed in the limiting channel 412 and can slide axially within the limiting channel 412. The lock cover 42 is fixedly connected to the lock body 41, and the limiting shaft 43 passes through the lock cover 42 and is slidably connected to the lock cover 42. By adjusting the position of the limiting shaft 43, it is possible to control whether the locking protrusion 31 can pass through the rotating section 4112 of the locking groove 411.

[0031] The lock body 41 has a ring-shaped structure, and the locking groove 411 can be formed on the inner wall of the ring-shaped structure. The limiting channel 412 can be a blind hole formed on the lock body 41, with the opening of the limiting channel 412 located at one end of the lock body 41, and the axis of the limiting channel 412 being parallel to the axis of the lock body 41. A portion of the limiting shaft 43 is disposed in the limiting channel 412 and can move along the axis of the limiting channel 412 within the limiting channel 412.

[0032] The lock cover 42 is fixedly connected to the lock body 41. The lock cover 42 has a through hole, and the limiting shaft 43 passes through the through hole to achieve a sliding connection with the lock cover 42. A portion of the limiting shaft 43 is exposed outside the lock body 41. By operating the portion of the limiting shaft 43 exposed outside the lock body 41, the position of the limiting shaft 43 can be adjusted.

[0033] In some embodiments, the portion of the limiting shaft 43 disposed within the limiting channel 412 forms two limiting protrusions 431, the spacing between the two limiting protrusions 431 matching the size of the locking protrusion 31; the limiting channel 412 at least partially passes through the rotating section 4112, and the limiting protrusions 431 can enter the rotating section 4112 to prevent the locking protrusion 31 from passing through the rotating section 4112.

[0034] The limiting protrusion 431 can enter the rotating section 4112 via the limiting channel 412, but at this time, the limiting protrusion 431 blocks the rotating section 4112, and the locking protrusion 31 cannot pass through the rotating section 4112. See also Figure 9 When all the limiting protrusions 431 have not entered the rotating section 4112, the locking protrusion 31 can pass through the rotating section 4112. At this time, the space between the two limiting protrusions 431 is exactly aligned with the rotating section 4112, and the distance between the two limiting protrusions 431 matches the size of the locking protrusion 31. The locking protrusion 31 can pass through the rotating section 4112 through the space between the two limiting protrusions 431.

[0035] In some embodiments, the locking device 40 is configured such that when the limiting shaft 43 is in the unlocked position, the locking protrusion 31 can pass through the rotating section 4112, and each limiting shaft 43 corresponds to a unique unlocked position.

[0036] It is understood that by adjusting the size of the limiting protrusion 431 and its position on the limiting shaft 43, each limiting shaft 43 can correspond to a unique unlocking position. This unlocking position can specifically be represented by the depth to which the limiting shaft 43 is inserted into the lock body 41. That is, when the limiting shaft 43 is inserted to a specified depth in the lock body 41, the limiting shaft 43 can be positioned in the unlocking position. Preferably, the two extreme positions of the limiting shaft 43 within the limiting channel 412 (the extreme positions are those where the limiting shaft 43 can no longer move along a certain axial direction after moving to a certain position) are not set as unlocking positions. This is because under most operating conditions, the limiting shaft 43 is generally located at the extreme positions within the limiting channel 412. Setting the extreme positions as unlocking positions would be detrimental to locking the reactor fuel assembly 100.

[0037] See Figures 10-11 In some embodiments, the reactor fuel assembly 100 further includes an unlocking device 50, which is configured to enable the limiting shaft 43 to be in an unlocked position to unlock the locking device 40.

[0038] The locking device 40 can be easily unlocked by providing the unlocking device 50. The unlocking device 50 allows the limiting shaft 43 of the locking device 40 to be in the unlocked position, enabling the locking protrusion 31 to pass through the rotating section 4112, thus allowing the locking device 40 to be removed from the locking part 30. It should be noted that the unlocking device 50 is only installed on the reactor fuel assembly 100 when it is necessary to unlock the locking device 40; when unlocking the locking device 40 is not required, the unlocking device 50 does not need to be installed on the reactor fuel assembly 100.

[0039] In some embodiments, the unlocking device 50 includes: a retaining cylinder 51, which is shaped to match the locking device 40 and can drive the locking device 40 to rotate around the axis of the locking device 40; a rotating cylinder 52, the mating end of which engages with the retaining cylinder 51 and can rotate relative to the retaining cylinder 51 at a certain angle, and can put the limiting shaft 43 in the unlocked position; a rotating cap 53, which is connected to the mating end of the rotating cylinder 52 and can pull the limiting shaft 43 outward from the limiting channel 412 by a certain distance; and a retaining ring 54, which is disposed inside the retaining cylinder 51 and is configured to limit the axial movement of the rotating cylinder 52 and the rotating cap 53 along the retaining cylinder 51.

[0040] The unlocking device 50 engages with the locking device 40 via the locking sleeve 51, allowing the locking cover 42 and part of the lock body 41 of the locking device 40 to enter the locking sleeve 51. As described above, when the locking device 40 is installed on or removed from the locking part 30, it needs to rotate at a certain angle to allow the locking protrusion 31 to pass through the rotating section 4112. Therefore, the shape of the inner cavity of the locking sleeve 51 of the unlocking device 50 matches the shape of the locking device 40, enabling the locking device 40 to rotate and thus allowing for its installation and removal from the locking part 30.

[0041] More specifically, see Figure 5 and Figure 6 In some embodiments, the locking cover 42 is provided with a transmission part 421, and the inner wall of the retaining sleeve 51 is provided with a transmission engagement part. The transmission part 421 engages with the transmission engagement part to restrict the rotation of the locking cover 42 relative to the retaining sleeve 51, so that the retaining sleeve 51 can drive the locking device 40 to rotate around the axis of the locking device 40. The locking cover 42 may be provided as an incomplete annular shape, for example... Figure 5 and Figure 6 The ring shown is missing a portion. The missing portion of the ring can serve as a transmission part 421. The inner wall of the clasp 51 is provided with a transmission mating part that matches the transmission part 421, so as to transmit the rotational force of the clasp 51 to the locking device 40.

[0042] The two ends of the rotating cylinder 52 form an operating end and a mating end, respectively. The unlocking device 50 can be moved, rotated, or otherwise operated via the operating end of the rotating cylinder 52. The mating end of the rotating cylinder 52 is fitted with a locking sleeve 51 and a cap 53. The mating end of the rotating cylinder 52 can engage with the locking sleeve 51, and the mating end of the rotating cylinder 52 can be pinned to the cap 53. The rotating cylinder 52 can rotate relative to the locking sleeve 51 at a certain angle; that is, the rotating cylinder 52 cannot rotate freely relative to the locking sleeve 51, but can only rotate within a certain specified range. When it exceeds the specified range, the rotating cylinder 52 can drive the locking sleeve 51 to rotate together. In some embodiments, the locking sleeve 51 is sleeved outside the mating end of the rotating cylinder 52. A first flange is formed radially inward at one end of the locking sleeve 51 near the end of the rotating cylinder 52, and a second flange is formed radially outward at the mating end of the rotating cylinder 52. The first flange and the second flange engage to achieve the engagement of the rotating cylinder 52 and the locking sleeve 51.

[0043] The rotating cylinder 52 enables the limiting shaft 43 to be in the unlocked position. Specifically, in some embodiments, the rotating cylinder 52 has an unlocking groove 521, the depth of which is related to the unlocking position of the limiting shaft 43. By setting an unlocking groove 521 of appropriate depth, the limiting shaft 43 can be positioned in the unlocked position. The specific operation method will be described in detail below. In some embodiments, when the unlocking device 50 is engaged with the locking device 40, the limiting shaft 43 in the unlocked position contacts the bottom of the unlocking groove 521.

[0044] The unlocking device 50 is fitted onto the locking device 40, that is, the cap 53 of the unlocking device 50 is in contact with the lock cap 42 of the locking device 40, or the depth of the locking device 40 entering the cylinder 52 can no longer be increased. At this time, the limiting shaft 43 located in the unlocking position will contact the bottom of the unlocking groove 521. In other words, when the unlocking device 50 is fitted onto the locking device 40, as long as the limiting shaft 43 is in contact with the bottom of the unlocking groove 521, it will necessarily be in the unlocking position, thereby realizing the unlocking function of the unlocking groove 521.

[0045] The cap 53 has a keyhole-shaped hole 531. One end of the limiting shaft 43, located outside the limiting channel 412, forms an end cap 432, which can pass through the keyhole-shaped hole 531. Specifically, the end cap 432 can pass through the larger portion of the keyhole-shaped hole 531. After the end cap 432 passes through the keyhole-shaped hole 531, the shaft of the limiting shaft 43 can move towards the smaller portion of the keyhole-shaped hole 531. The smaller portion of the keyhole-shaped hole 531 only allows the shaft of the limiting shaft 43 to pass through, but not the end cap 432. This allows the end cap 432 to be limited by the smaller portion of the keyhole-shaped hole 531. By limiting the end cap 432 through the keyhole-shaped hole 531, the limiting shaft 43 can be pulled out of the locking device 40 a certain distance.

[0046] When using the unlocking device 50 to unlock the locking device 40, since the limiting shaft 43 of the locking device 40 may be in a random position, the screw cap 53 of the unlocking device 50 is first used to pull the limiting shaft 43 outward to its limit position. Then, the unlocking groove 521 of the unlocking device 50 is used to abut against the limiting shaft 43 and push the limiting shaft 43 back. During the push-back process, the unlocking device 50 gradually engages with the locking device 40. When the unlocking device 50 engages with the locking device 40, the locking device 40 limits the axial movement of the unlocking device 50 so that the unlocking groove 521 can no longer push the limiting shaft 43 back. Through the precise design of the dimensions of each structure, the position of the limiting shaft 43 is exactly the unlocking position. Then, the locking device 40 is rotated by the clasp 51, and finally the locking device 40 is removed from the locking part 30, thus realizing the unlocking process of the locking device 40.

[0047] In some embodiments, there are multiple limiting shafts 43, each corresponding to a different unlocking position. When the locking device 40 is submerged in coolant, the limiting shafts 43 can move up and down within the limiting channel 412 due to the disturbance of the coolant. It can be understood that when multiple limiting shafts 43 are provided, multiple limiting shafts 43 need to be in the unlocking position simultaneously to unlock the locking device 40. Therefore, the movement of the limiting shafts 43 caused by various operating conditions is almost insufficient to open the locking device 40 without the unlocking device 50, thereby increasing the security of the locking device 40.

[0048] Regarding the embodiments of this application, it should also be noted that, without conflict, the embodiments of this application and the features in the embodiments can be combined with each other to obtain new embodiments.

[0049] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A reactor fuel assembly (100) capable of being locked within a core support (200) of a reactor, the reactor fuel assembly (100) comprising: Reactor fuel assembly body (10), locking part (30), stop part (20) and locking device (40); The locking part (30) is fixedly connected to the reactor fuel assembly body (10) through the stop part (20); The core support (200) has a through hole. When the reactor fuel assembly (100) is locked in the core support (200), the locking part (30) passes through the through hole. The locking device (40) is sleeved on the part of the locking part (30) that passes through the through hole. The core support (200) limits the axial movement of the reactor fuel assembly (100) through the locking device (40) and the stop part (20) to lock the reactor fuel assembly (100) in the core support (200). The size of the stop (20) and the locking device (40) is larger than the size of the through hole, so that the stop (20) and the locking device (40) cannot pass through the through hole of the core support (200).

2. The reactor fuel assembly (100) according to claim 1, wherein, The locking device (40) is a ring structure, and a locking groove (411) is provided on the inner side of the ring structure. The locking part (30) is provided with a locking protrusion (31), which can enter the locking slot (411) to fix the locking device (40) at a designated position on the locking part (30).

3. The reactor fuel assembly (100) according to claim 2, wherein, The locking slot (411) includes a guide section (4111), a rotating section (4112), and a fixing section (4113). The guide segment (4111) and the rotating segment (4112) are arranged perpendicularly, and the end of the guide segment (4111) is connected to the end of the rotating segment (4112); The rotating section (4112) and the fixed section (4113) are arranged perpendicularly, and the other end of the rotating section (4112) communicates with the middle of the fixed section (4113) to form a locking recess (41131) at the end of the fixed section (4113).

4. The reactor fuel assembly (100) according to claim 3, wherein, The locking device (40) includes a lock body (41), a lock cover (42), and a limiting shaft (43); The locking slot (411) is formed on the lock body (41), and the lock body (41) also forms a limiting channel (412). The limiting channel (412) extends along the axial direction of the locking device (40), and a portion of the limiting shaft (43) is disposed in the limiting channel (412) and is able to slide along the axial direction of the locking device (40) in the limiting channel (412). The lock cover (42) is fixedly connected to the lock body (41), and the limiting shaft (43) passes through the lock cover (42) and is slidably connected to the lock cover (42).

5. The reactor fuel assembly (100) according to claim 4, wherein, The portion of the limiting shaft (43) located within the limiting channel (412) forms two limiting protrusions (431), and the distance between the two limiting protrusions (431) matches the size of the locking protrusion (31). The limiting channel (412) passes at least partially through the rotating section (4112), and the limiting protrusion (431) can enter the rotating section (4112) to prevent the locking protrusion (31) from passing through the rotating section (4112).

6. The reactor fuel assembly (100) according to claim 5, wherein, The locking device (40) is configured such that when the limiting shaft (43) is in the unlocked position, the locking protrusion (31) can pass through the rotating section (4112), and each limiting shaft (43) corresponds to a unique unlocked position.

7. The reactor fuel assembly (100) according to claim 6, wherein, It also includes an unlocking device (50) configured to enable the limiting shaft (43) to be in the unlocked position in order to unlock the locking device (40).

8. The reactor fuel assembly (100) according to claim 7, wherein, The unlocking device (50) includes: A retaining sleeve (51) is formed in a shape that matches the locking device (40), and the retaining sleeve (51) is capable of driving the locking device (40) to rotate around the axis of the locking device (40); A rotating cylinder (52) has one end forming a mating end, which engages with the clamping cylinder (51). The rotating cylinder (52) can rotate relative to the clamping cylinder (51) and can position the limiting shaft (43) in the unlocked position. A screw cap (53) is connected to the mating end of the screw cylinder (52). The screw cap (53) can pull the limiting shaft (43) outward a certain distance from the limiting channel (412). A retaining ring (54) is disposed inside the retaining cylinder (51). The retaining ring (54) is configured to limit the axial movement of the rotating cylinder (52) and the rotating cap (53) along the retaining cylinder (51).

9. The reactor fuel assembly (100) according to claim 8, wherein, The lock cover (42) is provided with a transmission part (421), and the inner wall of the clamp (51) is provided with a transmission engagement part. The transmission part (421) cooperates with the transmission engagement part to restrict the rotation of the lock cover (42) relative to the clamp (51) so that the clamp (51) can drive the locking device (40) to rotate around the axis of the locking device (40).

10. The reactor fuel assembly (100) according to claim 8, wherein, The clamping sleeve (51) is sleeved on the outside of the mating end of the rotating cylinder (52). A first flange is formed radially inward at one end of the clamping sleeve (51) near the end of the rotating cylinder (52), and a second flange is formed radially outward at the mating end of the rotating cylinder (52). The first flange and the second flange are engaged to achieve the engagement of the rotating cylinder (52) and the clamping sleeve (51).

11. The reactor fuel assembly (100) according to claim 8, wherein, The rotating cylinder (52) has an unlocking groove (521), the depth of which is related to the unlocking position corresponding to the limiting shaft (43).

12. The reactor fuel assembly (100) according to claim 11, wherein, When the unlocking device (50) is engaged with the locking device (40), the limiting shaft (43) located at the unlocking position contacts the bottom of the unlocking groove (521).

13. The reactor fuel assembly (100) according to claim 8, wherein, The screw cap (53) has a keyhole-shaped hole (531), and the end of the limiting shaft (43) located outside the limiting channel (412) forms an end cap (432), which can pass through the keyhole-shaped hole (531).

14. The reactor fuel assembly (100) according to claim 6, wherein, There are multiple limiting axes (43), and each limiting axis (43) corresponds to a different unlocking position.

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