GB2524456A - Fuel component upper tube socket - Google Patents

Abstract

A fuel component upper tube socket is mainly formed of a connecting board (2), a surrounding board (3) fixed at an edge of the connecting board (2), and a frame board (4) fixed on the surrounding board (3). A connecting hole A (5) for installing a fuel component guide tube and a connecting hole B (6) for installing a meter tube are opened on the connecting board (2). A plurality of water flow holes in an overall long-strip shape is opened evenly on the connecting board (2). The water flow holes comprise a water flow hole A (201) and a water flow hole B (202), and an included angle greater than 0° exists between axial lines of the water flow hole A (201) and the water flow hole B (202). The advantages and beneficial effects of the upper tube socket lie in that, by changing the shape and arrangement manner of water flow holes, the water flow holes can be evenly arranged, and meanwhile a flow area proportion is increased, so that technical problems of low economic efficiency of an upper tube socket and undesirable flow field distribution of outlets of fuel components are solved.

Description

Specification

Fuel Component Upper Thbe Socket

Technical Field

The present invention relates to the field of nuclear industry, specifically to a fuel component upper tube socket.

Background Art

The fuel component is formed of multiple the! rods, guide tubes, spacer grids, io upper tube sockets, lower tube sockets and so on. Its structural diagram is as shown in Fig. 1. Among them, the upper tube socket 1 is a critical component and functions in latent positioning of the fuel component, carrying and transferring clamping force, providing outlet cavity for the coolant, providing an interfhce for the lifting of fuel components, preventing the pop-up of fuel rods and so on.

The existing fuel component upper tube socket is mainly formed of a connecting board, a surrounding board and a frame board. The connecting board of the upper tube socket is shown in Fig. 2. Generally, the connecting board is rectangular. The connecting board is provided with a circular meter tube connecting hole, a guide tube connecting hole and multiple water flow holes in an overall long-strip shape. The existing upper tube socket has the following problems: 1. The water flow holes are under improper arrangement so that there are not many water flow holes, directly resulting in a low flow area ratio on the connecting board and too large pressure drop between the upper and lower sides of the connecting board. In that case, it needs more primary pump head to ensure the cooling water fluidity to meet the requirements, resulting in poor economy; s 2. The water flow holes are under asymmetric arrangement, which adversely affects the flow field distribution at the outlet of the fuel components. As a result, redistribution of the cooling water through the upper tube socket is prone to lateral flow; which increases the risk of failure due to abrasion of the control rods and burnable poison rods.

Summary of the Invention

The present invention aims to provide a fuel component upper tube socket to overcome the poor economy of the existing upper tube socket and the adverse impact on the flow distribution at the outlet of fuel components.

The objectives of the present invention are achieved by the following is technical solution: The fUel component upper tube socket is formed of a connecting board, a surrounding board fixed on the connecting board and a frame board fixed on the surrounding board, wherein the connecting board is opened with a connecting hole A for installing a fuel component guide tube and a connecting hole B for installing a meter tube; the connecting board is uniformly provided with multiple water flow holes in an overall long-strip shape; the water flow holes consist of a water flow hole A and a water flow hole B; and there is an included angle greater than 00 between the water flow hole A and the water flow hole B; a connecting portion is formed between two axially adjacent water flow holes A and two water flow holes B on the connecting board; an encircled portion is lbrmed between two radially adjacent water flow holes A and two water flow holes B on the connecting board; the connecting board is also provided with a central water flow hole, and the connecting hole A, the connecting hole B and the central water flow hole are respectively arranged on the encircled portion.

To overcome the deficiencies of the prior art, th.e rnai.n technical problem lies in the way of more uniform arrangement of the waler flow holes with larger total area. The inventor divides the water flow holes into the water flow hole A and the water flow hole B, which are unparallel an.d arranged in a. cross manner. Compared with the parallel arrangement of the prior art, cross arrangement can not only achieve proper arrangement of the connecting hole A, the connecting hole B and ic the central water flow hole, hut also arrange water flow holes as many as possible to increase the flow area ratio on the connecting board, thus reducing the pressure drop between. the upper and lower sides of the connecting hoard. The connecting portion is to maintain, the integrity of the connecting board and can minimize the area of the connecting portion provided that the structural strength of the connectin.g hoard is ensured, thus maximizing the flow area ratio on the connecting board. Furthermore, subject to the arrangement of the connecting hole A, the rest space on the connecting board can be filled only by setting different sizes of water flow holes. and such water flow holes can not be arranged symmetrically, which leads to uneven outflow through the connecting board and greatly affects the flow field distribution at the outlet of fuel components However, cross arrangement can enable the water flow holes surrounding the connecting hole A and the connecting hole B to be processed into the same size and can also ensure uniform arrangement of the connecting hole A and the connecting hole B.Iii the present invention, all places of the connecting board have the same outflow, which has no impact on the flow field distribution at the outlet of the ftiel components and avoids lateral flow.

As a. first optimal scheme of the present invention, the water flow holes are rectangular. On the basis of ensuring the structural strength of the connecting board, the rectangular water flow holes can realize the shortest straight distance from the connecting hole A and the connecting hole B to the water flow hole, thereby increasing the flow area ratio on the connecting board.

As a second optimal scheme of the present invention, the side surface of the water flow hole is concaved into an arc surface A; and the radian of the arc surface A matches with that of the adjacent connecting hole A, the connecting hole B or s the central water flow hole. The arc surfice A is set to enable more uniform distribution of the materials between the water flow holes and the connecting hole A, the connection B or the central water flow hole so that there is no weak part, which can not only realize the flow area ratio but also reduce the impact on the structural strength of the connecting board. it can be seen that if the structural io strength of the connecting board is ensured, the distance between the arc surface A and the connecting hole A. the connection B or the central water flow hole can be minimized.

As further optimization of the second optimal scheme of the present invention, the end surface of the water flow hole is convex to form an arc surface B so that the water flow hole is of the structure which is narrow in the middle, wide in two ends and smooth at the edges, thereby increasing the flow area ratio and relieving stress concentration that is prone to occurrence at the edges of the water flow hole.

As further optimization of the second optimal scheme of the present invention, the end surface of the water flow hole is convex to form a protuberance with two sides of straight lines. The optimization also increases the flow area ratio, and the protuberance can be more extended in the axial direction. Jt needs to be noted that the top of the protuberance is of arc shape, straight angle or other shape.

The shape of the top of the protuberance is selected according to the physical properties of the material of the connecting board. For materials with strong resistance to stress concentration, straight angle is the priority to obtain a longer extension length.

Further, the side surfaces adjacent to the protuberance are parallel. The optimization can realize uniform distribution of the materials between the two side surfaces so as to make the materials more uniform on the connecting board and improve the structural strength of the connecting board. It can be seen that in this case it can further expand the area of the water flow holes so that the strength of the connecting board is close to the acceptable limit, thereby realizing the maximum flow area ratio.

As a third optimal scheme of the present invention, based on the above schemes, the connecting hole A and the central water flow hole are under cross arrangement, and the connecting hole B is located in the encircled portion in the center of the connecting board. This optimization can realize basically uniform flow of cooling water at all places of the connecting board, which further reduces the influence on the flow field distribution at the outlet of the fuel components.

As a fourth optimal scheme of the present invention, based on the above schemes, the connecting board is also provided with a water flow hole C, a water flow hole D and a water flow hole E; the water flow hole C is circular or a rounded IS rectangular; the water flow hole C is arranged on the four corners of the connecting board in rectangular array; the water flow hole D and the water flow hole E are elongated with two convex arc ends; the water flow hole E is shorter than the water flow hole D; and the water flow hole]) and the water flow hole E are arranged at the edge of the connecting board. The connecting board is square. In case of cross arrangement of water flow holes, the material is distributed unevenly at the edges, and a complete encircled portion cannot be formed at the edge of the connecting board so that the connecting hole A and the central water flow hole can not be opened, resulting in a waste of the area of the connecting board. The above optimization can not only make the material uniformly distributed at the edges of 2$ the connecting board but also make full use of the edge of the connecting board so that the flow area ratio is enlarged.

As a fifth optimal scheme of the present invention, on the basis of the above schemes, the axis of the water flow hole A is vertical to that of the water flow hole B. In this configuration, the encircled portion is substantially square and arrangement of the circular connecting hole A, the connecting hole B or the central water flow hole can make hill use of the area of the encircled portion, minimize the waste ot the area of the connecting board as well as maximize the flow area ratio.

As further optimization of the fifth. optimal scheme of the present invention, the connecting board is square; the axis of the water low hole A is parallel to a diagonal. of the connecting board; and the axis of the water flow hole B is parallel to the other diagonal of the connecting board. It can be seen that such method can arrange the most water flow holes on the connecting board, especially in posftions near the four corners of the connecting board, thereby increasing the number of water flow holes and the flow area ratio.

In summary, the advantages and beneficial effect of the present invention are as follows: 1, By changing the arrangement o:f the water flow holes, the present invention can realize uniform distribution of water flow holes and increase the flow area ratio, thereby solving the technical problem of poor economy of the upper tube socket and the adverse impact on flow field distribution at the outlet of fuel components: 2. By changing the shape of the water flow holes, the present invention further improves the flow area ratio and ensures the structural strength of the connecting board; 3. Cross arrangement of the connecting hole A and the central water flow hole realizes basically uniform flow of cooling water at all places of the connecting hoard, which further reduces the influence on the flow field distribution at the outlet of the the! components.

Brief Description of Drawings

in order to more clearly illustrate the embodiments of the present invention.

brief description is made for the drawings needs for description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments according to the present invention, Without any creative work, the technicians in this art can also obtain other drawings according to the following drawings.

Fig. I is the structural diagram of a fuel component; Fig. 2 is the structural diagram of a connecting board of the existing fuel component upper tube socket Fig. 3 is the section diagram of the present in..vention Fig. 4 is the sch.emati.c diagram of a hole-opening manner for the connecting board of the present invention; Fig. 5 is the schematic diagram of another hole-opening maimer for the i a connecting board of the present invention.; Fig. 6 is the top view of the present invention.

Wherein, the names of the corresponding parts and components in the figures are as follows: I-upper tube socket, 2connetcion p'ate, 3-surrounding board, 4-frame board, 5connecting hole A, 6-connecting hole B, 7-positioning pin hole, 8-hoiddown screw hole, 9-anti-dislocation hole, 10-lifting surface, 201-water flow hole A. 202-water flow hole B, 203-connecting portion, 204-encircled portion, 205-central water flow hole. 206-circular surface A, 207-circular surface lB. 208-protuberance, 209-water flow hole (2, 210-water flow hole 0, 211-water flow hole E, 212-side w surface A, 213-side surface B, and 214-spare portion.

Embodimeuts lEn order that a person skilled in the art can better understand the present invention, the fbllowin.g aims to give clear and complete description of the technical solutions of the embodiments of the present invention in conjunction with, drawings of the embodiments of the present invention, Obviously, the embodiments described below are merely partial. embodiments of the present invention instead, of all. Based on the embodiments described in. the present invention, all other embodiments obtained by a person skilled in the art without creative efforts are within the scope of protection of the present invention.

The "axis" of water flow hole refers to the centerline passing through the two ends of the water flow hole. The temi "axial direction" refers to the direction of the axis of the water flow hole. The term "radical direction" refers to the direction vertical to the axis of the water flow hole. Water flow holes include the water flow hole A201 and the water flow hole B202 which are of the same size and shape; the size and shape of the water flow hole C209, the water flow hole D210 and the water flow hole E2l 1 are different from that of the water flow hole A201 and the water flow hole B202 in some cases and therefore are not included in the range of the water flow holes.

Embodiment 1: As shown in Fig. 3 and Fig. 4, the fuel component upper tube socket consists of a connecting board 2, a surrounding board 3 fixed on the connecting board 2 and a frame board 4 fixed on the surrounding board 3, wherein the connecting board 2 is opened with a connecting hole AS for installing a fuel component guide tube and a connecting hole B6 for installing a meter tube; the connecting board 2 is uniformly provided with multiple water flow holes in an overall long-strip shape; the water flow holes consist of a water flow hole A201 and a water flow hole B202; and there is an included angle greater than 00 between the water flow hole A201 and the water flow hole B202; a connecting portion 203 is formed between two axially adjacent water flow holes A201 and two water flow holes B202 on the connecting board 2; an encircled portion 204 is formed between two radially adjacent water flow holes A201 and two water flow holes B202 on the connecting board 2; the connecting board 2 is also provided with a central water flow hole 205, and the connecting hole A5, the connecting hole B6 and the ceniral s water flow hole 205 are respectively arranged on the encircled portion 204.

The water flow holes are used for cooling water. Increasing the area of water flow holes can increase flow area ratio on the connecting board 2, thereby reducing the pressure drop on both sides of the connecting board 2, consuming less main pump head and improving the economy. The water flow holes are arranged uniformly as possible as it could be to prevent lateral flow of cooling water at the time of redistribution after passing through the upper tube socket and reduce the risk of failure due to abrasion of the control rods and burnable poison rods. To achieve the above objects, water flow holes are arranged in cross manner.

It can be seen that the method can, on the basis of ensuring the structural strength is of the connecting board 2, set as many water flow holes as possible, thereby increasing the flow area ratio, reducing the pressure drop and improving the economy. Moreover, this arrangement allows uniform distribution of the water flow holes to prevent lateral flow of cooling water at the time of redistribution after passing through the upper tube socket and reduce the risk of failure due to abrasion of the control rods and burnable poison rods.

The above is only a general idea of the present invention. In actual operation, in the precondition of ensuring the structural strength of the connecting board 2, the connecting portion 203 may be reduced as small as possible to increase the flow area ratio. The change of the angle between the water flow hole A201 and the water flow hole 8202 may change the area and shape of the encircled portion 204. On the basis of ensuring the stnictural strength of the connecting board 2 and smooth arrangement of the connecting hole A5, the connecting hole B6 and the central water flow hole 205, the area of the encircled portion 204 can be as small as possible to increase the flow area ratio.

Embodiment 2: In order to further increase the flow area ratio, on the basis of embodiment I, to the shape of the water flow holes is preferably rectangular in this embodiment. A person skilled in the art can understand that the rectangular water flow holes can realize the shortest straight distance from the connecting hole A5 and the connecting hole 86 to the water flow hole, thereby increasing the flow area ratio on the connecting board 2.

Embodiment 3: On the basis of embodiment 1, as shown in Fig. 4, in this embodiment, the side surface of the water flow hole is concaved into an arc surface A206; and the radian of the arc surface A206 matches with that of the adjacent connecting hole AS, the connecting hole 86 or the central water flow hole 205. A person skilled in the art can understand that the arc surface A206 is set to enable more uniform distribution of the materials between the water flow holes and the connecting hole A5, the connection 86 or the central water flow hole 205 so that there is no weak -10*-part, which can not only realize the flow area ratio but also reduce the impact on the structural strength of the connecting board 2. On the basis of ensuring the structural strength of the connecting board 2, the distance between the arc surface A206 and the connecting hole AS, the connection B6 or the central water flow $ hole 205 can be minimized.

Embodiment 4 On the basis of embodiment 3, as shown in Fig. , in this embodiment, the end suthce of the water flow hole is convex to form an arc surface B207. A person skilled in the art can understand that the above improvement enables the io water flow hole is of the structure which is narrow in the middle, wide in two ends and smooth at the edges, thereby increasing the flow area ratio and relieving stress concentration that is prone to occun-ence at the edges of the water flow hole.

According to calculation, the flow area ratio of this embodiment is increased by 6.5% than that of the existing upper wbe socket.

1$ Embodiment 5: On the basis of embodiment 3, as shown in Fig. 5, in this embodiment, the end surface of the water flow hole is convex to form a protuberance 208 with two sides of straight lines. The optimization also increases the flow area ratio, and the protuberance 208 can be more extended in the axial direction. It needs to be noted that the top of the protuberance 208 is of arc shape, straight angle or other shape.

The shape of the top of the protuberance 208 is selected according to the physical properties of the material of the connecting board 2. For materials with strong

-II

resistance to stress concentration, straight angle is the priori to obtain a longer extension length.

Embodiment & On the basis of embodiment 5, as shown in Fig. 5, in this embodiment, the sid.e surfaces adjacent to the protuberance 208 are parallel. In order to i.. ore dearly illustrate the optimization, in Fig. 5, two adjacent water flow holes are selected. The two nearest side surface A2 12 and. side surface B2 13 on the waler flow hole are parallel. The materials between the side surface A212 and side surface 13213 are elongated and are unifbrmly distributed so as to make the o materials on the connecting board more uniform and improve the structural strength of the connecting board. 2. It can be seen that in this case it can further expand the area of the water flow holes so that the strength of the connecting board is close to the acceptable limit, thereby realizing th.e maximum flow area.

ratio.

Embodiment 7: On the basis of above embodiments, as shown in Fig. 4 and Fig. 5, in this embodiment, the connecting hole AS and the central water flow hole 205 are under cross arrangement, and the connecting hole B6 is located in the encircled portion 204 in the center of the connecting board 2. Cross arranger. ent indicates the central water flow hole 205 is surrounded by the connecting hole AS and meanwhile the connecting hole AS is surrounded by the central water flow hole 205. This optimization can realize basically unift,rm flow of cooling water at all places of the connecting board 2, which further reduces the influence on the flow field distribution at the outlet of the the! components.

Embodiment 8: In terms of the embodiment based on the above embodiments, as shown in $ Fig. 4 and Fig. 5, the connecting board 2 is also provided with a water flow hole C209, a water flow hole D2 10 and a water flow hole E21 1; the water flow hole C209 is circular or a rounded rectangular; the water flow hole C209 is arranged on the four corners of the connecting board 2 in rectangular array; the water flow hole D2 10 and the water flow hole E2 11 are elongated with two convex arc ends; the water flow hole £211 is shorter than the water flow hole D210; and the water flow hole D210 and the water flow hole £211 are arranged at the edge of the connecting board 2.

AscanbeseenfromFig.4and5,theconnectingboard2issquare.J.ncaseof cross arrangement of water flow holes, the material is distributed unevenly at the is edges, and a complete encircled portion 204 cannot be formed at the edge of the connecting board so that the connecting hole A5 and the central water flow hole 205 can not be opened, resulting in a waste of the area of the connecting board 2.

The above optimization can not only make the material uniformly distributed at the edges of the connecting board 2 but also make full use of the edge of' the connecting board 2 so that the flow area ratio is enlarged.

The water flow hole D2 10 and the water flow hole £211 are arranged as shown in Fig. 4 and 5. The connecting hole AS at the edge of the connecting board 2 occupies a large space. Thus, relatively shorter water flow holes £211 is arranged near the connecting hole AS. The water flow hole A201 and the water flow hole B202 between two connecting holes A5 at the edge of the connecting board 2 are replaced by the water flow hole 1)210 in order to maximize the flow area ratio.

Furthermore, it is preferable that the axes of the water flow hole D210 and the water flow hole E2 11 are parallel to that of the connecting board 2; and the sides of the water flow hole D210 and the water flow hole E2l1 are parallel.

The water flow hole A201 and the water flow hole B202 near the four corners of the connecting board 2 are cancelled to leave a spare portion 214. Two central water flow holes 205 and one connecting hole A 5 are used to fill the surplus space of the spare portion 214, which not only realizes the maximum flow area ratio but also make it easier to arrange the water flow hole D2l0 and the water flow hole £211 at the edge of the connecting board 2.

Embodiment 9: On the basis of the above embodiments, as shown in Fig. 4 and 5, in this embodiment, the axis of the water flow hole A201 is vertical to that of the water flow hole 8202. In this configuration, the encircled portion 204 is substantially square and arrangement of the circular connecting hole AS, the connecting hole 86 or the central water flow hole 205 can make fill use of the area of the encircled portion 204, minimize the waste of the area of the connecting board 2 as well as maximize the flow area ratio.

Embodiment 10: On the basis of the embodiment 9, as shown in Fig. 4 and 5, in this embodiment, the connecting board 2 is square; the axis of the water flow hole A.201. is parallel to a diagonal of the connecting board 2; and the axis of the water S flow hole 8202 is parallel to the other diagonal of the connecting board 2. It can be seen that such method can arrange the most water flow holes on the connecting board 2, especially in positions near the ibur corners of the coi.nectmg hoard 2, thereby increasing the number of water flow holes and the flow area ratio.

Embodiment ii: The fuel component upper tube socket consists of a square connecting board 2, a. surrounding board 3 fixed on the connecting board 2 and a frame board 4 fixed on the surrounding board 3, wherein the connecting board 2 is opened with a connecting hole A5 kir installing a fuel component guide tube and a connecting hole 86 for installing a meter tube; the connecting board 2 is uniformly provided s with multiple water flow holes in an overall longstrip shape; the water how holes consist of a water flow hole A201 and a water flow hole 8202; and there is an included angle greater than O' between the water flow hole A20 1 and the water flow hole B202; a connecting portion 203 is formed between two axially adjacent water flow holes A201 and two water flow holes B202 on the connecting hoard 2; an encircled portion 204 is formed between two radially adjacent water flow holes A20 1 and two water flow holes 8202 on the connecting board 2; tile connecting board 2 is also provided with a central water flow hole 205, and the comwcting $ hole AS, the connecting hole B6 and the central water flow hole 205 are respectively arranged on the encircled portion 204. The axis of the water flow hole A201 is vertical to that of the water flow hole B202. The axis of the water flow hole A20l is parallel to a diagonal of the connecting board 2; and the axis of the water flow hole B202 is parallel to the other diagonal of the connecting board 2. The side surface of the water flow hole is concave to form an arc surface A (206); and the radian of the arc surfitce A206 matches with that of the adjacent connecting hole AS, the connecting hole 86 or the central water flow hole2O5.

The end surface of the water flow hole is convex to form a protuberance (208) io with two sides of straight lines. The side surfaces adjacent to the protuberance (208) are parallel. The connecting board2 is also provided with a water flow hole C209, a water flow hole D210 and a water flow hole E21l; the water flow hole C209 is circular or a rounded rectangular; the water flow hole C209 is arranged on the four corners of the connecting board 2 in rectangular array; the water is flow hole D2l0 and the water [low hole E21 late elongated with two convex arc ends; the water flow hole E211 is shorter than the water flow hole D210; and the water flow hole D210 and the water flow hole B21 1 are arranged at the edge of the connecting board 2.

The flow area ratio of this embodiment is increased by 7.8% than that of the existing upper tube socket.

Embodiment 12: On the basis of the embodiments above, as shown in Fig. 3 and 6, in this embodiment, positioning pin holes 7 are provided on two opposite corners of the frame board 4 so that the present invention can match the positioning pins of the upper core plate. The other two opposite corners of the upper end surface of the frame board 4 are respectively provided with hoiddown screw holes 8 for S mounting the plate spring to achieve the axial compression of the fuel components.

The upper end surlkce of the frame board 4 is further provided with an anti-dislocation hole 9, which is located at any corner provided with a holddown screw hole 8 for identiQiing the direction of the components in the core and being compatible with the lifting tools. The number and location of the positioning pin io holes 7, the hoiddown screw holes 8 and anti-dislocation holes 9 are not limited to the above situation and can be designed according to the actual situation. For example: the number and location of the positioning pin holes 7 can be determined according to that of the upper core plate as long as its location matches with the positioning pin. The inside of the frame board 4 is provided with is a lifting surfIce 10 to facilitate the lifting of the fuel components.

In order to enable a person skilled in the art to have a clearer understanding of the present invention, the process of the present invention is described.

First of all, the connecting board 2, the surrounding board 3 and the frame board 4 are processed respectively; Then, the surrounding board 3 is placed on the upper end surface of the connecting board 2, then the frame board 4 is placed on the upper end surface of the surrounding board 3 and then fixed by tools and fixture; Fi.n.afly, the connecting board 2, the surrounding hoard 3 and the frame board 4 are welded into an integral; A person skilled in the art can recognize that many other embodiments can he achieved by selectively applying multiple embodiments mentioned above. in light of the ahili of a person skilled in the art, this article does not provide or describe in details all possible repeated contents provided that all corn.binations and possible embodiments in other ways are part of the presen.t application.