Tube socket structure and nuclear fuel assembly

Abstract

The embodiment of the invention discloses a tube base structure and a nuclear fuel assembly. The tube base structure for the nuclear fuel assembly comprises a connecting plate, a surrounding plate and a top plate. Wherein the connecting plate comprises a plate body, a plurality of reinforcing ribs, a pipe hole and water passing holes, the guide pipe hole is formed in the plate body, the reinforcing ribs are arranged on the peripheral side of the pipe hole, and the water passing holes are formed in intervals among the reinforcing ribs. The connecting plate comprises a plurality of reinforcing ribs arranged on the peripheral side of the pipe hole, and the intervals among the reinforcing ribs form the water passing holes, so that it can be guaranteed that the connecting plate has a large enough water passing area, meanwhile, the strength of the connecting plate can be improved, connection between the connecting plate and the guide pipe is more reliable, and the service life of the connecting plate is prolonged. Therefore, the connection between the connecting plate and the instrument pipe is more reliable, the connection between the pipe seat structure and the guide pipe and the instrument pipe is more reliable, and the reliability of the nuclear fuel assembly is further improved.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of nuclear reaction technology, and in particular to a tube seat structure and a nuclear fuel assembly. Background Art

[0002] The nuclear fuel assembly consists of an upper tube seat, a lower tube seat, a guide tube, an instrument tube, a fuel rod and a grid. The connection plate of the tube seat is provided with a guide tube hole and a water flow hole. The guide tube hole is used to connect the guide tube, and the water flow hole is used to pass water to cool the fuel rod. Due to the multiple water flow holes on the tube seat, the strength of the guide tube hole and the instrument tube hole on the connection plate is seriously reduced, and the connection structure between the guide tube hole and the guide tube is unreliable. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art or related art.

[0004] To this end, a first aspect of the present invention provides a tube base structure.

[0005] A second aspect of the present invention provides a nuclear fuel assembly.

[0006] In view of this, according to a first aspect of an embodiment of the present application, a tube seat structure for a nuclear fuel assembly is proposed, comprising:

[0007] Connecting plate;

[0008] a panel connected to the connecting plate;

[0009] A top plate connected to an end of the enclosure plate facing away from the connecting plate;

[0010] Wherein, the connecting plate includes a plate body, a plurality of reinforcing ribs, a tube hole and a water hole. The tube hole is opened on the plate body, a plurality of the reinforcing ribs are arranged around the tube hole, and the intervals between the plurality of the reinforcing ribs form the water hole.

[0011] In a feasible implementation manner, at least part of the plurality of reinforcing ribs are arranged in a divergent manner from the center of the tube hole to the periphery of the tube hole.

[0012] In a feasible implementation manner, a plurality of the reinforcing ribs are arranged in a crisscross pattern around the tube hole.

[0013] In a feasible implementation manner, there are a plurality of the tube holes, and the plurality of the reinforcing ribs are divided into a plurality of groups, and a group of the reinforcing ribs is arranged around the circumference of each of the tube holes.

[0014] In a feasible implementation manner, the plurality of reinforcing ribs include:

[0015] The transverse reinforcement, the longitudinal reinforcement and the first oblique reinforcement and the second oblique reinforcement, the transverse reinforcements between different groups of reinforcements in the first direction are in the same straight line, the longitudinal reinforcements between different groups of reinforcements in the second direction are in the same straight line, the first oblique reinforcements between different groups of reinforcements in the third direction are in the same straight line, the first oblique reinforcements between different groups of reinforcements in the third direction are in the same straight line, and the second oblique reinforcements between different groups of reinforcements in the fourth direction are in the same straight line;

[0016] Wherein, the angle between the third direction and the first direction is 30° to 60°;

[0017] Wherein, the included angle between the fourth direction and the first direction is 30° to 60°.

[0018] In a feasible implementation, some of the multiple tube holes are instrument tube holes, and some of the tube holes are guide tube holes. The instrument tube holes are arranged in the middle of the plate body, and the guide tube holes are arranged on the peripheral sides of the instrument tube holes of the plate body.

[0019] In a feasible implementation manner, along the thickness direction of the plate body, the guide tube hole includes a first hole segment and a second hole segment, and the hole diameter of the first hole segment is larger than the hole diameter of the second hole segment.

[0020] In a feasible implementation manner, the ratio of the length of the second hole segment to the thickness of the plate body is greater than or equal to one third.

[0021] In a feasible embodiment, there are multiple tube holes, and the plate body is polygonal. The tube holes at the corners of the plate body are avoided from the outer wall of the plate body, so that the tube holes at the corners are convenient for the tube holes at the edge of the plate body, which are closer to the center of the plate body.

[0022] According to a second aspect of an embodiment of the present application, a nuclear fuel assembly is provided, comprising:

[0023] A tube base structure as described in any of the above technical solutions;

[0024] A guide tube is connected to the tube seat structure through the tube hole.

[0025] Compared with the prior art, the present invention has at least the following beneficial effects:

[0026] The tube seat structure for a nuclear fuel assembly provided in an embodiment of the present application includes a connecting plate, a surrounding plate and a top plate. The connecting plate includes a plate body, a plurality of reinforcing ribs, a tube hole and a water hole. The tube hole is opened on the plate body, and a plurality of reinforcing ribs are arranged on the peripheral side of the tube hole. The intervals between the plurality of reinforcing ribs form the water hole. Based on this, when the tube seat structure is applied to a nuclear fuel assembly, the tube seat structure can be used as an upper tube seat for a nuclear fuel assembly. The tube seat structure, the lower tube seat, the guide tube, the instrument tube, the fuel rod and the grid together constitute the nuclear fuel assembly. The upper end of the guide tube is connected to the tube seat structure through the tube hole, and the lower end is connected to the lower tube seat. The instrument tube can be connected to the tube seat structure through the tube hole. The fuel rod is arranged on the grid, and the grid is connected to the guide tube. The connecting plate includes a plurality of reinforcing ribs arranged around the tube hole, and the intervals between the plurality of reinforcing ribs form water holes, thereby ensuring that the connecting plate has a sufficiently large water flow area and at the same time improving the strength of the connecting plate, making the connection between the connecting plate and the guide tube more reliable, the connection between the connecting plate and the instrument tube more reliable, and the connection between the tube seat structure and the guide tube and the instrument tube more reliable, thereby improving the reliability of the nuclear fuel assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Also, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0028] Figure 1 A schematic structural diagram of a tube seat structure for a nuclear fuel assembly according to an embodiment of the present application;

[0029] Figure 2 A schematic structural diagram of a connecting plate for a tube base structure of a nuclear fuel assembly according to an embodiment of the present application;

[0030] Figure 3 for Figure 2 A local enlarged schematic diagram of the middle A;

[0031] Figure 4 for Figure 2 A local enlarged schematic diagram of point B in the middle.

[0032] in, Figures 1 to 4 The corresponding relationship between the reference numerals and the component names is as follows:

[0033] 110 connecting plate, 120 enclosure plate, 130 top plate;

[0034] 111 plate body, 112 reinforcing ribs, 113 pipe holes, 114 water holes, 115 mounting parts; 1121 transverse ribs, 1122 longitudinal ribs, 1123 first oblique ribs, 1124 second oblique ribs;

[0035] 1311 instrument tube hole, 1312 guide tube hole, 13121 first hole section, 13122 second hole section. DETAILED DESCRIPTION

[0036] In order to better understand the above-mentioned technical scheme, the technical scheme of the embodiments of the present application is described in detail below through the accompanying drawings and specific embodiments. It should be understood that the embodiments of the present application and the specific features in the embodiments are detailed descriptions of the technical scheme of the embodiments of the present application, rather than limitations on the technical scheme of the present application. In the absence of conflict, the embodiments of the present application and the technical features in the embodiments may be combined with each other.

[0037] like Figures 1 to 4 As shown, according to the first aspect of an embodiment of the present application, a tube seat structure for a nuclear fuel assembly is proposed, including: a connecting plate 110; a surrounding plate 120, the surrounding plate 120 is connected to the connecting plate 110; a top plate 130, the top plate 130 is connected to one end of the surrounding plate 120 facing away from the connecting plate 110; wherein the connecting plate 110 includes a plate body 111, a plurality of reinforcing ribs 112, a tube hole 113 and a water hole 114, the tube hole 113 is opened on the plate body 111, and the plurality of reinforcing ribs 112 are arranged on the peripheral side of the tube hole 113, and the intervals between the plurality of reinforcing ribs 112 form the water hole 114.

[0038] The tube seat structure for a nuclear fuel assembly provided in an embodiment of the present application includes a connecting plate 110, a circumferential plate 120 and a top plate 130. The connecting plate 110 includes a plate body 111, a plurality of reinforcing ribs 112, a tube hole 113 and a water hole 114. The tube hole 113 is opened on the plate body 111, and a plurality of reinforcing ribs 112 are arranged on the peripheral side of the tube hole 113. The intervals between the plurality of reinforcing ribs 112 form the water hole 114. Based on this, when the tube seat structure is applied to a nuclear fuel assembly, the tube seat structure can be used as an upper tube seat for a nuclear fuel assembly. The tube seat structure, the lower tube seat, the guide tube, the instrument tube, the fuel rod and the grid together constitute a nuclear fuel assembly. The upper end of the guide tube is connected to the tube seat structure through the tube hole 113, and the lower end is connected to the lower tube seat. The instrument tube can be connected to the tube seat structure through the tube hole 113. The fuel rod is arranged on the grid, and the grid is connected to the guide tube. The connecting plate 110 includes a plurality of reinforcing ribs 112 arranged around the tube hole 113, and the intervals between the plurality of reinforcing ribs 112 form water holes 114, based on which it can be ensured that the connecting plate 110 has a sufficiently large water flow area, and at the same time the strength of the connecting plate 110 can be improved, so that the connection between the connecting plate 110 and the guide tube is more reliable, the connection between the connecting plate 110 and the instrument tube is more reliable, and the connection between the tube seat structure and the guide tube and the instrument tube is more reliable, thereby improving the reliability of the nuclear fuel assembly.

[0039] like Figures 1 to 4 As shown, in a feasible implementation manner, the plurality of reinforcing ribs 112 are arranged in a divergent manner around the tube hole 113 through at least a portion of the reinforcing ribs 112 from the center of the tube hole 113 .

[0040] In this technical solution, a layout of multiple reinforcing ribs 112 is further provided, and at least part of the multiple reinforcing ribs 112 are arranged in a divergent manner from the center of the tube hole 113 to the surrounding side of the tube hole 113. Based on this, multiple water holes 114 can be formed on the surrounding side of each tube hole 113 to ensure the water flow area. The reinforcing ribs 112 are arranged in a divergent manner from the center of the tube hole 113 to the surrounding side of the tube hole 113, which can further ensure the strength of the tube hole 113, making the connection between the tube seat structure and the guide pipe and the instrument pipe more reliable.

[0041] It can be understood that, through the provision of multiple divergent reinforcing ribs 112, during actual use, the multiple reinforcing ribs 112 defined by the multiple water holes 114 on the plate body 111 are just above the center of each fuel rod, and the width of the reinforcing ribs 112 is greater than the installation error of the fuel rod, ensuring that the plate body 111 effectively stops the fuel rod in the vertical direction.

[0042] It is understandable that, through the arrangement of multiple divergent reinforcing ribs 112, the cross-sections of the multiple water holes 114 are all polygonal structures. In practical applications, the water for cooling the fuel rods is not restricted by the shape of the water holes 114 and can smoothly pass through the water holes 114, while the cylindrical fuel rods cannot pass through the polygonal water holes 114 under the impact of the cooling water. This further achieves reliable stopping of the fuel rods and maximizes the use of the area of ​​the plate body 111.

[0043] like Figures 1 to 4 As shown, in a feasible embodiment, a plurality of reinforcing ribs 112 are arranged in a crisscross pattern on the circumference of the tube hole 113 .

[0044] In this technical solution, a plurality of reinforcing ribs 112 are further provided. The plurality of reinforcing ribs 112 are arranged in a crisscross shape around the tube hole 113. Some of the reinforcing ribs 112 are arranged in a divergent shape around the tube hole 113, and some of the reinforcing ribs 112 are arranged around the crisscross shape. The instrument tube or guide tube can be collaboratively supported by the plurality of reinforcing ribs 112, thereby further ensuring the strength of the reinforcing ribs 112 and making the connection between the tube seat structure and the guide tube and the instrument tube more reliable.

[0045] like Figures 1 to 4 As shown, in a feasible implementation manner, there are a plurality of tube holes 113 , and the plurality of reinforcing ribs 112 are divided into a plurality of groups, and a group of reinforcing ribs 112 is disposed around the circumference of each tube hole 113 .

[0046] In this technical solution, considering that the nuclear fuel assembly needs to fix multiple guide tubes and the instrument tube, multiple tube holes 113 can be set, and each tube hole 113 can be surrounded by multiple reinforcing ribs 112 to ensure the strength of each tube hole 113, thereby making the connection between the tube seat structure and the guide tubes and instrument tubes more reliable.

[0047] like Figures 1 to 4 As shown, the x direction is the first direction, the y direction is the second direction, the z direction is the third direction, and the w direction is the fourth direction. In a feasible embodiment, the multiple reinforcing ribs 112 include: transverse ribs 1121, longitudinal ribs 1122, first oblique ribs 1123, and second oblique ribs 1124. In the first direction, the transverse ribs 1121 between different groups of reinforcing ribs 112 are on the same straight line, and in the second direction, the longitudinal ribs 1122 between different groups of reinforcing ribs 112 are on the same straight line. In the third direction, the first oblique ribs 1123 between different groups of reinforcing ribs 112 are on the same straight line. In the third direction, the first oblique ribs 1123 between different groups of reinforcing ribs 112 are on the same straight line. In the fourth direction, the second oblique ribs 1124 between different groups of reinforcing ribs 112 are on the same straight line.

[0048] In the technical solution, a plurality of reinforcing ribs 112 are further provided. The plurality of reinforcing ribs 112 may include a transverse rib 1121, a longitudinal rib 1122, a first oblique rib 1123 and a second oblique rib 1124. Based on this, a group of reinforcing ribs 112 similar to a cross-shaped cross can be formed on the circumference of each tube hole 113, which can make the tube hole 113 stronger. Furthermore, in the second direction, the longitudinal ribs 1122 between different groups of reinforcing ribs 112 are on the same straight line, and in the third direction, the first oblique ribs 1123 between different groups of reinforcing ribs 112 are on the same straight line. In the third direction, the first oblique ribs 1123 between different groups of reinforcing ribs 112 are on the same straight line, and in the fourth direction, the second oblique ribs 1124 between different groups of reinforcing ribs 112 are on the same straight line. That is to say, the reinforcing ribs 112 in different groups can be arranged in the same line. Such an arrangement, on the one hand, is convenient for the production and processing of the connecting plate 110; on the other hand, it ensures the strength of all the reinforcing ribs 112, so that the force on the connecting plate 110 is more balanced, thereby being able to better fix the guide tube and the instrument tube.

[0049] It can be understood that the connecting plate 110 can be rectangular, and the first direction can be the width direction of the connecting plate 110, the second direction can be the length direction of the connecting plate 110, and the third direction and the fourth direction can be inclined relative to the first direction and the second direction. Based on this, a group of reinforcing ribs 112 that are approximately in the shape of a cross can be formed on the surrounding side of each tube hole 113.

[0050] like Figures 1 to 4 As shown, in a feasible implementation, the angle between the third direction and the first direction is 30° to 60°. In this way, the multiple reinforcing ribs 112 surrounding each tube hole 113 can be combined to bear the force of the tube hole 113, so that the force of the tube hole 113 can be more balanced. Preferably, the angle between the third direction and the first direction is 45°.

[0051] In a feasible implementation, the angle between the fourth direction and the first direction is 30° to 60°. In this way, the plurality of reinforcing ribs 112 surrounding each tube hole 113 can be combined to bear the force of the tube hole 113, so that the force of the tube hole 113 can be more balanced. Preferably, the angle between the third direction and the first direction is 45°.

[0052] like Figures 1 to 4 As shown, in a feasible embodiment, some of the multiple tube holes 113 are instrument tube holes 1131, and some of the tube holes 113 are guide tube holes 1132. The instrument tube holes 1131 are arranged in the middle of the plate body 111, and the guide tube holes 1132 are arranged on the peripheral side of the instrument tube holes 1131 of the plate body 111.

[0053] In this technical solution, a plurality of tube holes 113 are further provided. Some of the tube holes 113 are instrument tube holes 1131, and some of the tube holes 113 are guide tube holes 1132. Based on this, the instrument tube can be installed through the instrument tube hole 1131, so that the instrument tube can be arranged in the middle of the connecting plate 110, and the instrument panel can be fixed more reliably. The plurality of guide tube holes 1132 are distributed around the tube hole 113, and the guide tube holes 1132 can fix the guide tube.

[0054] like Figures 1 to 4 As shown, in a feasible implementation manner, along the thickness direction of the plate body 111 , the guide tube hole 1132 includes a first hole segment 11321 and a second hole segment 11322 , and the aperture of the first hole segment 11321 is larger than the aperture of the second hole segment 11322 .

[0055] In this technical solution, a style of the guide tube hole 1132 is further provided. The guide tube hole 1132 includes a first hole segment 11321 and a second hole segment 11322. The aperture of the first hole segment 11321 is larger than the aperture of the second hole segment 11322. A segmented design is adopted. On the one hand, it can make the fixation of the guide tube more reliable; on the other hand, it can make the guide tube concentrically fixed to ensure the fixation accuracy.

[0056] like Figures 1 to 4 As shown, in a feasible implementation manner, the ratio of the length of the second hole segment 11322 to the thickness of the plate body 111 is greater than or equal to one third.

[0057] In this technical solution, a relationship between the second hole segment 11322 and the plate body 111 is further provided, and the ratio of the length of the second hole segment 11322 to the thickness of the plate body 111 is greater than or equal to one third. Further combined with the fact that the aperture of the first hole segment 11321 is greater than the aperture of the second hole segment 11322, that is, the length of the smaller-diameter second hole segment 11322 is guaranteed, so that the second hole segment 11322 can better fix the guide tube hole 1132, thereby ensuring the fixing strength of the guide tube hole 1132.

[0058] like Figures 1 to 4 As shown, in a feasible embodiment, there are multiple tube holes 113, and the plate body 111 is polygonal. A clearance is formed between the tube holes 113 at the corners of the plate body 111 and the outer wall of the plate body 111, so that the tube holes 113 at the corners are convenient for the tube holes 113 at the edge of the plate body 111, which are closer to the center of the plate body 111.

[0059] In this technical solution, the style of the plate body 111 is further provided. The plate body 111 can be a polygonal structure, such as a rectangle, a hexagon, an octagon, etc. When the multiple tube holes 113 are arranged, the tube holes 113 located at the corners of the plate body 111 can avoid the corners of the plate body 111. Such an arrangement, on the one hand, further ensures the mechanical strength of the tube holes 113 at the corners; on the other hand, it is convenient to assemble the plate body 111 and the sealing plate, and to facilitate the assembly of the tube seat structure on the nuclear fuel assembly.

[0060] Example

[0061] like Figures 1 to 4 As shown, in the tube seat structure provided in this embodiment, the connecting plate 110 is used to form a tube seat structure together with the shroud plate 120 and the top plate 130, and the tube seat structure, the lower tube seat, the guide tube, the instrument tube, the fuel rod and the grid together form a fuel assembly. The connecting plate 110 includes a plate body 111, and the plate body 111 is penetrated by an instrument tube hole 1131, a plurality of water holes 114 and a plurality of guide tube holes 1132. The instrument tube hole 1131 is used to place an instrument tube for measuring the internal environment of the fuel assembly, the plurality of water holes 114 are used to allow water for cooling the fuel rods to pass through, and the plurality of guide tube holes 1132 are used to be connected to the plurality of guide tubes respectively.

[0062] In this embodiment, a plurality of water holes 114 define a plurality of reinforcing ribs 112 in the shape of a cross-shaped grille on the plate body 111. The cross-shaped grille includes a mounting portion 115 and a plurality of reinforcing ribs 112 radiating outward in a cross-shaped pattern with the mounting portion 115 as the center. The mounting portion 115 of the cross-shaped grille located in the middle of the plate body 111 is penetrated by an instrument pipe hole 1131, and the mounting portions 115 of the remaining plurality of cross-shaped grilles are all penetrated by guide pipe holes 1132.

[0063] The mounting portion 115 is evenly supported in the circumferential direction by a plurality of reinforcing ribs 112 that diverge outward in a cross shape, and has a higher strength, that is, the strength of the instrument tube hole 1131 and the guide tube hole 1132 that penetrate the mounting portion 115 is significantly improved. Therefore, in practical applications, the matching structure formed by the instrument tube and the instrument tube hole 1131 and the matching structure formed by the guide tube and the guide tube hole 1132 are stronger, and the structure is more stable and reliable, thereby significantly improving the structural strength of the upper tube seat and the fuel assembly, and improving safety.

[0064] Figure 1The direction indicated by the X arrow in the figure is the first horizontal direction, and the direction indicated by the Y arrow is the second horizontal direction. In this embodiment, the plurality of M-shaped grilles are composed of a plurality of reinforcing ribs 112 groups arranged in sequence in the first horizontal direction and a plurality of reinforcing ribs 112 groups arranged in sequence in the second horizontal direction. The plurality of reinforcing ribs 112 groups each include a plurality of M-shaped grilles arranged in sequence along the second horizontal direction. The plurality of reinforcing ribs 112 groups each include a plurality of M-shaped grilles arranged in sequence along the first horizontal direction. The first horizontal direction is perpendicular to the second horizontal direction.

[0065] The plate body 111 in this embodiment is rectangular, the first horizontal direction is the direction in which the long side of the plate body 111 extends, and the second horizontal direction is the direction in which the wide side of the plate body 111 extends.

[0066] In other embodiments, the shape of the plate body 111 can be adjusted according to actual application conditions, and the first horizontal direction and the second horizontal direction are directions perpendicular to each other and parallel to the plane where the plate body 111 is located. For example, when the plate body 111 is located in a plane that forms an angle with the horizontal plane in actual application, the first horizontal direction and the second horizontal direction may also form an angle with the horizontal plane.

[0067] A plurality of cross-shaped grilles form a well-shaped area on the connection plate 110 , and the connection plate 110 is provided with guide pipe holes 1132 and a plurality of water holes 114 in areas corresponding to the four vertex corners of the well-shaped area.

[0068] It should be noted that the crisscross area refers to the four vertices of the rectangular area being vacant, and the tube hole 113 avoids the corners of the connecting plate 110, that is, the two reinforcing ribs 112 groups at the two ends of the first horizontal direction lack the number of crisscross grilles compared to the other reinforcing ribs 112 groups, and the missing positions are just at the two ends of the second horizontal direction. Similarly, the two reinforcing ribs 112 groups at the two ends of the second horizontal direction also lack the number of crisscross grilles compared to the other reinforcing ribs 112 groups, and the missing positions are just at the two ends of the first horizontal direction.

[0069] In order to ensure the structural integrity of the plate body 111, the plate body 111 is also provided with guide pipe holes 1132 and multiple water holes 114 at four vacant top corners of the well-shaped area surrounded by multiple M-shaped grilles. The multiple reinforcing ribs 112 defined by the multiple water holes 114 in pairs correspond to the extension directions of the multiple reinforcing ribs 112 in the M-shaped grilles.

[0070] In this embodiment, each group of reinforcing ribs 112 includes transverse ribs 1121, longitudinal ribs 1122, first oblique ribs 1123 and second oblique ribs 1124. The number of transverse ribs 1121, longitudinal ribs 1122, first oblique ribs 1123 and second oblique ribs 1124 are all two. The two transverse ribs 1121 are symmetrically distributed around the mounting portion 115, and the two longitudinal ribs 1122 are symmetrically distributed around the mounting portion 115. Similarly, the two first oblique ribs 1123 are symmetrically distributed around the mounting portion 115, and the two second oblique ribs 1124 are symmetrically distributed around the mounting portion 115.

[0071] In some examples, the extension direction of the transverse rib 1121 is the same as the first horizontal direction, the extension direction of the longitudinal rib 1122 is the same as the second horizontal direction, the extension direction of the first oblique rib 1123 is at an angle of 45° to the first horizontal direction and the second horizontal direction, and the extension direction of the second oblique rib 1124 is perpendicular to the extension direction of the first oblique rib 1123.

[0072] The multiple M-shaped grilles corresponding to any two adjacent groups of reinforcing ribs 112 are aligned in the first horizontal direction, that is, the transverse ribs 1121 of any M-shaped grille extend in the same direction as the transverse ribs 1121 of the M-shaped grille adjacent to it in the first horizontal direction. The multiple longitudinal ribs 1122 of the M-shaped grilles corresponding to any group of reinforcing ribs 112 are aligned in the second horizontal direction, that is, the longitudinal ribs 1122 of any M-shaped grille extend in the same direction as the longitudinal ribs 1122 of the M-shaped grille adjacent to it in the second horizontal direction.

[0073] Similarly, in the third horizontal direction, the first oblique ribs 1123 of any two adjacent M-shaped grilles are aligned. Figure 1 The direction indicated by the arrow Z in the figure is the extension direction of the first oblique ribs 1123. In the fourth horizontal direction, the second oblique ribs 1124 of any two adjacent M-shaped grilles are aligned. Figure 1 The direction indicated by the W arrow is the extension direction of the second oblique rib 1124.

[0074] In this embodiment, the M-shaped grille formed by multiple reinforcing ribs 112 is square, that is, the lengths of the horizontal ribs 1121 and the longitudinal ribs 1122 are equal, the lengths of the first oblique ribs 1123 and the second oblique ribs 1124 are equal, the extension directions of the first oblique ribs 1123 and the second oblique ribs 1124 coincide with the two sets of diagonals of the square respectively, and the horizontal ribs 1121 and the longitudinal ribs 1122 are respectively perpendicular to the two sets of opposite sides of the square structure.

[0075] Therefore, the distance between any two adjacent mounting portions 115 in the first horizontal direction is equal to the distance between any two adjacent mounting portions 115 in the second direction, that is, substantially equal to the sum of the lengths of two transverse ribs 1121 or two longitudinal rows. The distance between any two adjacent mounting portions 115 in the third horizontal direction is equal to the distance between any two adjacent mounting portions 115 in the fourth direction, that is, substantially equal to the sum of the lengths of two first oblique ribs 1123124 or two second oblique ribs 1124.

[0076] It should be noted that, in addition to achieving circumferentially uniform support for the instrument tube holes 1131 and the guide tube holes 1132, the multiple reinforcing ribs 112 of the M-shaped grid can also, in actual applications, stop the multiple fuel rods below in the vertical direction to prevent the fuel rods from detaching from the fuel assembly and entering the upper core under the impact of cooling water.

[0077] Furthermore, in actual applications, the connecting plate 110 provided in this embodiment has a plurality of reinforcing ribs 112 defined by a plurality of water holes 114 on the plate body 111 that are located just above the center of each fuel rod, and the width of the reinforcing ribs 112 is greater than the installation error of the fuel rod, thereby ensuring that the plate body 111 effectively stops the fuel rod in the vertical direction.

[0078] In order to further achieve reliable stopping of the fuel rods and maximize the use of the area of ​​the plate body 111, in this embodiment, the cross-sections of the multiple water holes 114 are all polygonal structures. In practical applications, the water for cooling the fuel rods is not restricted by the shape of the water holes 114 and can pass through the water holes 114 smoothly, while the cylindrical fuel rods cannot pass through the polygonal water holes 114 under the impact of the cooling water.

[0079] To avoid stress concentration and ensure uniform peripheral strength of the mounting portion 115 , in this embodiment, the periphery of the mounting portion 115 formed at the confluence of each group of reinforcing ribs 112 forms a circular trajectory, and the instrument tube hole 1131 and the guide tube hole 1132 are coaxially arranged with their respective corresponding mounting portions 115 .

[0080] In order to facilitate the installation of the guide tube, in this embodiment, the guide tube hole 1132 includes a first hole section 11321 and a second hole section 11322 that are coaxially connected, and the aperture of the first hole section 11321 is larger than the aperture of the second hole section 11322. The first hole section 11321 with a larger aperture is used to accommodate the connection structure to achieve the connection and fixation of the guide tube, while the second hole section 11322 with a smaller aperture is used to position the guide tube and allows the guide tube hole 1132 to pass through during the disassembly process.

[0081] The ends of the first hole section 11321 and the second hole section 11322 that are away from each other extend to opposite sides of the plate body 111 in the thickness direction. In order to achieve reliable positioning constraint on the guide tube hole 1132, in this embodiment, the length of the second hole section 11322 is greater than or equal to one third of the thickness of the plate body 111.

[0082] In this embodiment, the number of M-shaped grilles is twenty-one, which constitute five groups of reinforcing ribs 112 arranged sequentially in the first horizontal direction and five grille rows arranged sequentially in the second horizontal direction. It should be noted that the same M-shaped grille serves as both a unit constituting a group of reinforcing ribs 112 and a unit constituting a grille row.

[0083] The two groups of reinforcing ribs 112 at the two ends in the first direction each include three cross-shaped grilles, and the three groups of reinforcing ribs 112 in the middle each include five cross-shaped grilles. Similarly, the two grid rows at the two ends in the second direction each include three cross-shaped grilles, and the three grid rows in the middle each include five cross-shaped grilles.

[0084] The number of guide tube holes 1132 is twenty-four, twenty of which are respectively arranged on the twenty mounting portions 115 corresponding to the twenty M-shaped grilles, and the remaining four guide tube holes 1132 are respectively arranged on the plate body 111 at the four vacant top corner positions corresponding to the well-shaped area surrounded by multiple M-shaped grilles, and the instrument tube hole 1131 is arranged on the mounting portion 115 of the M-shaped grille in the middle of the plate body 111.

[0085] In other embodiments, the number and relative positions of the M-shaped grille and the guide tube holes 1132 can be adaptively adjusted according to actual application conditions.

[0086] In summary, the connecting plate 110 provided in this embodiment, through the arrangement of multiple water holes 114, defines a plurality of M-shaped grilles on the plate body 111, thereby forming instrument tube holes 1131 and guide tube holes 1132 on the mounting portion 115 in the middle position of the M-shaped grilles, thereby significantly improving the strength of the instrument tube holes 1131 and the guide tube holes 1132.

[0087] Therefore, the connection plate 110 provided in this embodiment has higher strength at the instrument tube hole 1131 and the guide tube hole 1132, and can establish a more reliable connection with the instrument tube and the guide tube.

[0088] See also Figure 4 , Figure 4 Shown is a cross-sectional view of the tube base structure provided in this embodiment.

[0089] In addition, the pipe base structure of the present embodiment further includes a top plate 130 , a surrounding plate 120 and the aforementioned connecting plate 110 , so the pipe base structure has the characteristics of higher strength and a more stable and reliable structure.

[0090] The connecting plate 110 provided in this embodiment, together with the top plate 130 and the shroud 120, forms a tube seat structure. The top plate 130 is welded to the shroud 120, and the shroud 120 is welded to the connecting plate 110. Four leaf springs are connected above the top plate 130 by bolts. The four leaf springs abut against the upper core to achieve elastic fixation of the fuel assembly.

[0091] In practical applications, the base structure, lower base, guide tube, instrument tube, fuel rod and grid together form a nuclear fuel assembly. The upper and lower ends of the guide tube are connected to the base structure and the lower base respectively, the fuel rod is arranged on the grid, and the grid is connected to the guide tube.

[0092] like Figures 1 to 4 As shown, according to the second aspect of the embodiment of the present application, a nuclear fuel assembly is proposed, including: a tube seat structure as any of the above technical solutions; a guide tube, and the guide tube is connected to the tube seat structure through a tube hole 113.

[0093] Since the nuclear fuel assembly provided in the embodiment of the present application includes a tube socket structure as in any of the above-mentioned technical solutions, the nuclear fuel assembly has all the beneficial effects of the tube socket structure of the above-mentioned technical solutions.

[0094] The nuclear fuel assembly provided in the embodiment of the present application includes a tube seat structure and a guide tube, and the tube seat structure includes a connecting plate 110, a circumference plate 120 and a top plate 130. The connecting plate 110 includes a plate body 111, a plurality of reinforcing ribs 112, a tube hole 113 and a water hole 114, and the guide tube hole 1132 is opened on the plate body 111, and a plurality of reinforcing ribs 112 are arranged on the peripheral side of the tube hole 113, and the intervals between the plurality of reinforcing ribs 112 form the water hole 114. Based on this, when the tube seat structure is applied to the nuclear fuel assembly, the tube seat structure can be used as an upper tube seat for the nuclear fuel assembly, and the tube seat structure, the lower tube seat, the guide tube, the instrument tube, the fuel rod and the grid together constitute the nuclear fuel assembly. The upper end of the guide tube is connected to the tube seat structure through the tube hole 113, and the lower end is connected to the lower tube seat. The instrument tube can be connected to the tube seat structure through the tube hole 113, and the fuel rod is arranged on the grid, and the grid is connected to the guide tube. The connecting plate 110 includes a plurality of reinforcing ribs 112 arranged around the tube hole 113, and the intervals between the plurality of reinforcing ribs 112 form water holes 114, based on which it can be ensured that the connecting plate 110 has a sufficiently large water flow area, and at the same time the strength of the connecting plate 110 can be improved, so that the connection between the connecting plate 110 and the guide tube is more reliable, the connection between the connecting plate 110 and the instrument tube is more reliable, and the connection between the tube seat structure and the guide tube and the instrument tube is more reliable, thereby improving the reliability of the nuclear fuel assembly.

[0095] In the present invention, the terms "first", "second", and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance; the term "plurality" refers to two or more, unless otherwise clearly defined. The terms "installed", "connected", "connected", "fixed", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; "connected" can be a direct connection or an indirect connection through an intermediate medium. 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.

[0096] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by terms such as “upper”, “lower”, “left”, “right”, “front” and “back” are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific orientation, and therefore, cannot be understood as a limitation on the present invention.

[0097] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiments", 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 representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0098] The above are only preferred embodiments of the present invention and are 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.

Claims

1. A tube base structure for a nuclear fuel assembly, characterized in that: include: Connecting plate; a panel connected to the connecting plate; A top plate connected to an end of the enclosure plate facing away from the connecting plate; Wherein, the connecting plate includes a plate body, a plurality of reinforcing ribs, a tube hole and a water hole. The tube hole is opened on the plate body, a plurality of the reinforcing ribs are arranged around the tube hole, and the intervals between the plurality of the reinforcing ribs form the water hole.

2. The tube base structure for a nuclear fuel assembly according to claim 1, characterized in that: At least part of the plurality of reinforcing ribs are arranged in a divergent manner from the center of the tube hole to the periphery of the tube hole.

3. The tube base structure for a nuclear fuel assembly according to claim 1, characterized in that: The plurality of reinforcing ribs are arranged in a crisscross pattern on the circumference of the tube hole.

4. The tube base structure for a nuclear fuel assembly according to claim 1, characterized in that: There are a plurality of the tube holes, and the plurality of reinforcing ribs are divided into a plurality of groups, and a group of reinforcing ribs is arranged on the circumference of each of the tube holes.

5. The tube base structure for a nuclear fuel assembly according to claim 4, characterized in that: The plurality of reinforcing ribs include: The transverse reinforcement, the longitudinal reinforcement and the first oblique reinforcement and the second oblique reinforcement, the transverse reinforcements between different groups of reinforcements in the first direction are in the same straight line, the longitudinal reinforcements between different groups of reinforcements in the second direction are in the same straight line, the first oblique reinforcements between different groups of reinforcements in the third direction are in the same straight line, the first oblique reinforcements between different groups of reinforcements in the third direction are in the same straight line, and the second oblique reinforcements between different groups of reinforcements in the fourth direction are in the same straight line; Wherein, the angle between the third direction and the first direction is 30° to 60°; Wherein, the included angle between the fourth direction and the first direction is 30° to 60°.

6. The tube base structure for a nuclear fuel assembly according to claim 4, characterized in that: Some of the plurality of tube holes are instrument tube holes, and some of the tube holes are guide tube holes. The instrument tube holes are arranged in the middle of the plate body, and the guide tube holes are arranged on the peripheral sides of the instrument tube holes of the plate body.

7. The tube base structure for a nuclear fuel assembly according to claim 6, characterized in that: Along the thickness direction of the plate body, the guide tube hole includes a first hole segment and a second hole segment, and the hole diameter of the first hole segment is larger than the hole diameter of the second hole segment.

8. The tube base structure for a nuclear fuel assembly according to claim 7, characterized in that: The ratio of the length of the second hole segment to the thickness of the plate body is greater than or equal to one third.

9. The tube base structure for a nuclear fuel assembly according to claim 1, characterized in that: There are multiple tube holes, and the plate body is polygonal. The tube holes at the corners of the plate body are avoided from the outer wall of the plate body, so that the tube holes at the corners are convenient for the tube holes at the edge of the plate body, which are closer to the center of the plate body.

10. A nuclear fuel assembly, characterized in that: include: The tube base structure according to any one of claims 1 to 9; A guide tube is connected to the tube seat structure through the tube hole.

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