WO2016201680A1 - Nozzle unit of fuel assembly - Google Patents

Nozzle unit of fuel assembly Download PDF

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Publication number
WO2016201680A1
WO2016201680A1 PCT/CN2015/081826 CN2015081826W WO2016201680A1 WO 2016201680 A1 WO2016201680 A1 WO 2016201680A1 CN 2015081826 W CN2015081826 W CN 2015081826W WO 2016201680 A1 WO2016201680 A1 WO 2016201680A1
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WO
WIPO (PCT)
Prior art keywords
rib
hole
fuel assembly
flow
flow hole
Prior art date
Application number
PCT/CN2015/081826
Other languages
French (fr)
Chinese (zh)
Inventor
禹文池
周跃民
陈建新
张国梁
李伟才
陈晓明
刘雨利
Original Assignee
中科华核电技术研究院有限公司
中国广核集团有限公司
中国广核电力股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by 中科华核电技术研究院有限公司, 中国广核集团有限公司, 中国广核电力股份有限公司 filed Critical 中科华核电技术研究院有限公司
Priority to PCT/CN2015/081826 priority Critical patent/WO2016201680A1/en
Publication of WO2016201680A1 publication Critical patent/WO2016201680A1/en

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Classifications

    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21C—NUCLEAR REACTORS
    • G21C3/00—Reactor fuel elements and their assemblies; Selection of substances for use as reactor fuel elements
    • G21C3/30—Assemblies of a number of fuel elements in the form of a rigid unit
    • G21C3/32—Bundles of parallel pin-, rod-, or tube-shaped fuel elements
    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21C—NUCLEAR REACTORS
    • G21C3/00—Reactor fuel elements and their assemblies; Selection of substances for use as reactor fuel elements
    • G21C3/30—Assemblies of a number of fuel elements in the form of a rigid unit
    • G21C3/32—Bundles of parallel pin-, rod-, or tube-shaped fuel elements
    • G21C3/322—Means to influence the coolant flow through or around the bundles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D35/00—Filtering devices having features not specifically covered by groups B01D24/00 - B01D33/00, or for applications not specifically covered by groups B01D24/00 - B01D33/00; Auxiliary devices for filtration; Filter housing constructions
    • B01D35/02—Filters adapted for location in special places, e.g. pipe-lines, pumps, stop-cocks
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E30/00—Energy generation of nuclear origin
    • Y02E30/30—Nuclear fission reactors

Definitions

  • the invention relates to the technical field of nuclear reactors, and in particular to a fuel assembly header unit of a nuclear reactor.
  • the fuel assembly of the nuclear reactor generally comprises a lower header, an upper header, a grid, a fuel rod, a guiding tube and an instrument tube, and the fuel rod, the guiding tube and the instrument tube are supported in parallel between the upper tube and the lower tube, all
  • the grid is fixed on the guide tube and the instrument tube at a certain distance along the axial direction of the fuel assembly, all grids have the same arrangement and number of cells, and the fuel rod, the guide tube and the instrument tube pass through each of the fuel assembly axially one by one. The cells in the same position of the grid.
  • the lower header 10 of the fuel assembly is mostly composed of a coupling plate 11 connected to four legs.
  • the coupling plate 11 is formed by a plurality of lower ribs 12.
  • the compartments 13 through which the fluid passes are separated, and the lower header 10 also covers the thin plate 14 (anti-foreign board) for chip protection.
  • the current lower header has the following problems: the flow field is uneven; the pressure drop is high.
  • the anti-foreign board 14 itself has a self-resistance coefficient, which has a natural balance effect on the uniform fluid, but the effect is blocked by the ribs 12 between the cavities and is not fully utilized.
  • the boundary between the rib 12 and the cell 15 on the gusset 11 is solid, and the lateral space of the foreign matter prevention panel is not fully utilized.
  • the technical problem to be solved by the present invention is to provide a fuel assembly header unit with a low pressure drop and a balanced flow field.
  • the technical solution adopted by the present invention to solve the technical problem is to provide a fuel assembly base unit, comprising a frame that is vertically permeable, a plurality of first ribs arranged in parallel in the frame, and a plurality of parallel a second rib arranged at intervals; the first rib and the second rib are arranged in a staggered manner, and a flow hole for longitudinally passing the fluid is separated in the frame;
  • the first ribs and/or the second ribs are provided with transverse flow holes for lateral passage of the fluid, the transverse flow holes communicating with the two flow holes on both sides thereof.
  • the cross flow holes are located at an upper end and/or a lower end of the first rib and/or the second rib.
  • the cross flow hole extends from an upper end surface of the first rib and/or the second rib to a lower end direction, and/or from the first rib and/or the second rib The lower end end extends in the upward direction;
  • the open end of the lateral flow hole extends transversely through the lateral dimension of the flow hole; the size of the transverse flow hole gradually decreases from the open end to the bottom thereof.
  • the header unit further includes a tube mounting portion disposed in the frame, the tube mounting portion being located at an intersection of the first rib and the second rib.
  • the plurality of tube mounting portions include an instrument tube mounting hole located in a middle portion of the frame body and a guide tube mounting hole located around the instrument tube mounting hole.
  • the header unit is a lower header, which further includes a leg connected below the corner of the frame.
  • the leg is further provided with a through hole extending longitudinally to the frame.
  • the header unit is an upper header or grid.
  • the stem unit further includes an anti-fouling plate covering the frame body, and a part of the fluid longitudinally passing through the water-flow hole is laterally flowed through the cross-flow hole under the blockage of the anti-foreign material plate;
  • the anti-foreign board includes a substrate and a filter hole group and a mounting hole group distributed on the substrate, and the mounting hole group is disposed corresponding to the tube mounting portion.
  • the filter hole diameter in the filter hole group is smaller than the flow hole diameter.
  • a cross flow hole is provided between the water holes in the frame body, which solves the shortcoming of sudden increase or sudden decrease of the flow blocking area in the prior art, and allows the fluid to be laterally before entering the foreign body prevention plate.
  • the flow and equilibrium flow field solves the strong lateral flow caused by the uneven flow field in the prior art.
  • FIG. 1 is a schematic cross-sectional structural view of a lower header in the prior art
  • Figure 2a is a schematic illustration of the flow direction of a fluid in a prior art fuel assembly
  • Figure 2b is a diagram showing the change of the flow blocking area in the lower header in the prior art
  • FIG. 3 is a schematic structural view of a fuel assembly header unit in a fuel assembly according to an embodiment of the present invention
  • Figure 4 is a schematic cross-sectional view of the frame body of the stem unit shown in Figure 3;
  • FIG. 5 is a schematic structural view of a fuel assembly header unit in a fuel assembly according to another embodiment of the present invention.
  • Figure 6 is a graph showing changes in the flow restriction area in the stem unit shown in Figure 5.
  • a fuel assembly base unit includes a frame 20 that is vertically permeable, a plurality of first ribs 21, and a plurality of second ribs 22, and a plurality of first ribs.
  • the plate 21 and the plurality of second ribs 22 are respectively arranged in parallel in the frame body 20.
  • the first rib 21 and the second rib 22 are staggered, and a water hole 23 through which the fluid passes longitudinally is partitioned in the frame 20, and the water hole 23 is also vertically permeable.
  • the first rib 21 and/or the second rib 22 are provided with a transverse flow hole 24 through which the fluid passes, the transverse flow hole 24 communicating with the two flow holes 23 on both sides thereof; when the fluid longitudinally passes through the flow hole 23, part of the fluid It is also possible to flow laterally between the flow holes 23 through the cross flow holes 24, so that the entire flow field is equalized, and the pressure drop is also effectively reduced.
  • the frame 20 may have a shape such as a square, a rectangle, a regular pentagon or a regular hexagon.
  • the first rib 21 and the second rib 22 are integrally formed with the frame 20 in the casing 20, and the overall structural strength is high.
  • the first rib 21 and the second rib 22 may be parallel to the diagonal of the frame 20 or parallel to the side plates of the frame 20, respectively.
  • the longitudinal areas of the first rib 21 and the second rib 22 constitute the side walls of the flow holes 23, and the lateral flow holes 24 are located on the side walls between the adjacent two flow holes 23.
  • the lateral flow hole 24 may be located on one side wall or a plurality of side walls thereof.
  • the side wall of the water injection hole 23 located at the outer periphery (near the frame body 20) is composed of the first rib 21, the second rib 22, and the side plates of the frame 20, and the side plates are not provided with lateral flow holes.
  • the lateral flow holes 24 are located at the upper ends of the first ribs 21 and/or the second ribs 22, and extend from the upper end faces of the first ribs 21 and/or the second ribs 22 to the lower end direction.
  • the lateral flow holes 24 may also be located at the lower ends of the first ribs 21 and/or the second ribs 22, extending from the lower end faces of the first ribs 21 and/or the second ribs 22 in the upward end direction.
  • the open end of the lateral flow hole 24 extends transversely across the lateral dimension of the flow hole 23 such that the open end dimension of the lateral flow hole 24 is substantially the same as the lateral dimension of the flow hole 23.
  • the size of the cross flow hole 24 is gradually reduced from the open end to the bottom thereof, so that the flow blocking area in the stem unit gradually decreases or gradually increases, and the pressure decreases, instead of suddenly decreasing or suddenly increasing. And the pressure drop is high.
  • the size of the cross-flow hole is gradually reduced, so that the lateral flow hole 24 has a saddle shape, a U shape, or a V shape, a parabola shape or a semicircular shape.
  • the fluid flows laterally along the flow holes 23 while passing through the frame 20, and lateral flow is also achieved through the flow holes 23 to equalize the flow field.
  • the lateral flow between the fuel rods 3 is weak (as indicated by an arrow C in Fig. 3) due to the uniform flow field, and the flow-induced vibration of the fuel rod 3 is reduced or avoided.
  • the header unit further includes a tube mounting portion (not shown) provided in the housing 20, and the tube mounting portion is located at the intersection of the first rib 21 and the second rib 22.
  • the plurality of pipe fittings may include an instrument pipe mounting hole located in a middle portion of the frame body 20 and a guide pipe mounting hole located around the instrument pipe mounting hole; the instrument pipe mounting hole is inserted into the instrument pipe of the fuel assembly, and the guiding pipe mounting hole is provided for fuel The guide tube of the assembly is plugged.
  • the instrument tube mounting hole and the plurality of guide tube mounting holes are arranged in an equally spaced array on the first rib 21 and the second rib 22.
  • the header unit is a lower header, which further includes legs 25 connected below the corners of the frame 20 for supporting on the lower core plate 2.
  • the leg 25 can be integrally formed with the frame 20. Fluid such as cooling water flows upward from the lower core plate 2 to the lower header, passes through the flow hole 23, contacts the fuel rod 3 of the fuel assembly, and cools the fuel rod 3.
  • the leg 25 is further provided with a through hole 250 extending longitudinally to the frame 20.
  • the through hole 250 is also capable of passing a fluid such as cooling water to increase the flow area of the entire stem unit.
  • the size of the through hole 250 may be larger than the size of the flow hole 23. Since the through hole 250 is located at a corner of the frame 20, the flow rate of the fluid through the through hole 250 is relatively small, and the foreign matter therein is not easily covered on the frame 20. The foreign board prevents damage.
  • the header unit further includes an anti-fouling plate 26 covering the frame 20 for filtering foreign matter in the fluid; a part of the fluid passing through the flow hole 23 in the longitudinal direction is blocked by the anti-object plate 26 through the cross-flow hole 24.
  • the lateral flow reduces the flow blocking area of the foreign matter prevention plate 26 and increases the flow area.
  • the anti-foreign board 26 is firmly supported by the top of the side panel of the frame 20, the tops of the first ribs 21 and the second ribs 22, and has a shape matching with the shape of the frame 20 so as to be conformable to the frame 20 .
  • the lateral passage flows and can flow upward through the filter hole group on the foreign matter prevention plate 26 during the flow.
  • the thickness thereof may be increased on the original basis.
  • the foreign matter prevention plate 26 may include a substrate 261 and a filter hole group and a mounting hole group (not shown) distributed on the substrate 261, and the fluid flows through the filter hole group and flows upward to the fuel rod 3.
  • the filter well set includes a plurality of filter holes 262, and the filter holes 262 in the filter hole set have a smaller pore size than the flow holes 23 to filter foreign matter of a smaller size in the fluid.
  • the mounting hole group is set corresponding to the pipe fitting mounting portion.
  • the mounting hole group includes a first mounting hole that communicates with the instrument tube mounting hole, and a second mounting hole that communicates with the guide tube mounting hole.
  • a fuel assembly base unit is different from the embodiment shown in the above figure in that the cross flow hole 24 is located at the first rib 21 and/or the second rib 22. Upper and lower ends. The horizontal flow hole 24 on the upper end and the horizontal flow hole 24 on the lower end are isolated from each other and are not connected. By the superimposed arrangement of the cross-flow holes 24 on the upper and lower ends, the lateral flow of the fluid between the flow holes 23 is enhanced to further balance the flow field.
  • D1, D2, and D3 represent a frame area, an anti-foreign board area, and a guide tube area, respectively.
  • D1 the fluid flows through the lateral flow of the upper end and the lower end transverse flow hole 24.
  • the flow blocking area gradually increases, and when the fluid flows out of the flow hole 23, the flow blocking area gradually decreases. Small; after passing D2, it is stable at D3 and smaller than the change when passing through the frame 20, reducing the pressure drop.
  • header unit of the present invention is not limited to the lower header.
  • the header unit can be an upper header or grid of the fuel assembly.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • General Engineering & Computer Science (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Fuel Cell (AREA)

Abstract

Disclosed is a nozzle unit of a fuel assembly, which comprises a vertically permeable frame body (20), and a plurality of first rib plates (21) arranged in parallel at intervals and a plurality of second rib plates (22) arranged in parallel at intervals in the frame body (20), wherein the first rib plates (21) and the second rib plates (22) are arranged in a staggered manner, a flow hole (23) provided for a fluid to longitudinally pass through is separated in the frame body (20); and the first rib plate (21) and/or the second rib plate (22) is provided with a transverse flow hole (24) provided for the fluid to transversely pass through, and the transverse flow hole (24) is in communication with two flow holes (23) located on two sides thereof. The nozzle unit of the fuel assembly allows the fluid to flow transversely before entering into a foreign matter prevention plate, which balances a flow field and solves a strong transverse flow caused by a non-uniform flow field in the prior art.

Description

燃料组件管座单元  Fuel assembly header unit 技术领域Technical field
本发明涉及核反应堆技术领域，尤其涉及一种核反应堆的燃料组件管座单元。  The invention relates to the technical field of nuclear reactors, and in particular to a fuel assembly header unit of a nuclear reactor.
背景技术Background technique
核反应堆的燃料组件一般包括下管座、上管座、格架、燃料棒、导向管和仪表管等，燃料棒、导向管和仪表管平行间隔支撑于上管座和下管座之间，所有格架沿燃料组件轴向相隔一定距离固定在导向管和仪表管上，所有格架都有相同的栅元排列和数量，燃料棒、导向管和仪表管沿燃料组件轴向逐个穿过每个格架的相同位置的栅元。 The fuel assembly of the nuclear reactor generally comprises a lower header, an upper header, a grid, a fuel rod, a guiding tube and an instrument tube, and the fuel rod, the guiding tube and the instrument tube are supported in parallel between the upper tube and the lower tube, all The grid is fixed on the guide tube and the instrument tube at a certain distance along the axial direction of the fuel assembly, all grids have the same arrangement and number of cells, and the fuel rod, the guide tube and the instrument tube pass through each of the fuel assembly axially one by one. The cells in the same position of the grid.
目前，参考图1、2a，燃料组件的下管座10大都由一个与四只支腿连接的联接板11组成，如图1所示，联接板11通过下方肋板12的设置形成有多个相隔的供流体通过的腔体13，下管座10上还会覆盖用于防屑的薄板14（防异物板）。目前的这种下管座存在以下问题：流场不均匀；压降高。 At present, referring to Figs. 1, 2a, the lower header 10 of the fuel assembly is mostly composed of a coupling plate 11 connected to four legs. As shown in Fig. 1, the coupling plate 11 is formed by a plurality of lower ribs 12. The compartments 13 through which the fluid passes are separated, and the lower header 10 also covers the thin plate 14 (anti-foreign board) for chip protection. The current lower header has the following problems: the flow field is uneven; the pressure drop is high.
其中，导致流场不均匀的原因有： Among them, the reasons for the uneven flow field are:
1）、由于流体从下堆芯板1流出后为一束存在轴向速度不均匀的流体（以下堆芯板1流水孔为中心依次径向递降），流体向上流动，流至下管座10时还是存在流速不均匀的问题，如图2a所示。在目前现有的下管座中，腔体13结构虽然对压降有利，但不利于流场均匀，因此流体从防异物板14的流水孔流出后还会存在很大不均匀性，这种不均匀性带来直接的效应有：a）导致整个组件下部流速分布不均；b）为了平衡产生的强横流，如图2a中箭头A所示；这两种效应叠加会造成燃料棒的流致振动。如果这种不均匀性得到控制，流致振动会造成下部燃料棒包壳破损。 1), since the fluid flows out from the lower core plate 1 as a bundle of fluid having an axial velocity non-uniformity (the following core plate 1 flows radially downward from the center of the flow hole), the fluid flows upward and flows to the lower header 10 There is still a problem of uneven flow rate, as shown in Figure 2a. In the presently existing lower header, although the structure of the cavity 13 is advantageous for the pressure drop, it is not conducive to the uniform flow field, so there is a great unevenness after the fluid flows out from the flow hole of the foreign matter prevention plate 14. The direct effects of inhomogeneity are: a) causing uneven distribution of the velocity of the lower part of the assembly; b) strong crossflow for balance, as indicated by the arrow A in Figure 2a; the superposition of these two effects will cause the flow of the fuel rod Cause vibration. If this non-uniformity is controlled, the flow-induced vibration will cause damage to the lower fuel rod cladding.
2）、下管座的腔体13之间的肋板12上没有横向开孔，这样两个相邻腔体13之间就不存在流量交换。 2) There are no lateral openings in the ribs 12 between the cavities 13 of the lower header, so that there is no flow exchange between the two adjacent cavities 13.
3）、防异物板14本身自有阻力系数，对均匀流体天然有一种平衡效应，但该效应受腔体之间的肋板12隔断，没有得到充分利用。 3) The anti-foreign board 14 itself has a self-resistance coefficient, which has a natural balance effect on the uniform fluid, but the effect is blocked by the ribs 12 between the cavities and is not fully utilized.
导致压降高的原因有：流体进入肋板12前后，经历了阻流面积阶跃；如图2b所示（其中B1、B2及B3分别代表肋板区域、防异物板区域及导向管区域），假设其采用常识所用的小倒角，阻流面积会突然增大或突然减小，因此还是存在较大的阶跃，这样的阶跃已被证明会大幅增加压降（形阻过大）。 The reasons for the high pressure drop are: before and after the fluid enters the rib 12, it undergoes a step of the choke area; as shown in Fig. 2b (where B1, B2 and B3 represent the rib area, the anti-foreign board area and the guide tube area, respectively). Assuming that it uses the small chamfer used in common sense, the flow blocking area will suddenly increase or suddenly decrease, so there is still a large step. Such a step has been proved to greatly increase the pressure drop (excessive resistance) .
另外，如图1所示，肋板12与联接板11上小区15交界区为实心，没有充分利用防异物板的横向空间。 Further, as shown in Fig. 1, the boundary between the rib 12 and the cell 15 on the gusset 11 is solid, and the lateral space of the foreign matter prevention panel is not fully utilized.
发明内容Summary of the invention
本发明要解决的技术问题在于，提供一种低压降、均衡流场的燃料组件管座单元。 The technical problem to be solved by the present invention is to provide a fuel assembly header unit with a low pressure drop and a balanced flow field.
本发明解决其技术问题所采用的技术方案是：提供一种燃料组件管座单元，包括上下通透的框体、在所述框体内的数个平行间隔排列的第一筋板和数个平行间隔排列的第二筋板；所述第一筋板和所述第二筋板呈交错设置，在所述框体内分隔出供流体纵向通过的流水孔； The technical solution adopted by the present invention to solve the technical problem is to provide a fuel assembly base unit, comprising a frame that is vertically permeable, a plurality of first ribs arranged in parallel in the frame, and a plurality of parallel a second rib arranged at intervals; the first rib and the second rib are arranged in a staggered manner, and a flow hole for longitudinally passing the fluid is separated in the frame;
所述第一筋板和/或所述第二筋板开设有供所述流体横向通过的横流孔，所述横流孔连通位于其两侧的两个所述流水孔。 The first ribs and/or the second ribs are provided with transverse flow holes for lateral passage of the fluid, the transverse flow holes communicating with the two flow holes on both sides thereof.
优选地，所述横流孔位于所述第一筋板和/或所述第二筋板的上端和/或下端。 Preferably, the cross flow holes are located at an upper end and/or a lower end of the first rib and/or the second rib.
优选地，所述横流孔自所述第一筋板和/或所述第二筋板的上端端面向下端方向延伸、和/或自所述第一筋板和/或所述第二筋板的下端端面向上端方向延伸； Preferably, the cross flow hole extends from an upper end surface of the first rib and/or the second rib to a lower end direction, and/or from the first rib and/or the second rib The lower end end extends in the upward direction;
所述横流孔的开口端横向贯通所述流水孔的横向尺寸；所述横流孔的尺寸自其开口端到其底部逐渐缩小。 The open end of the lateral flow hole extends transversely through the lateral dimension of the flow hole; the size of the transverse flow hole gradually decreases from the open end to the bottom thereof.
优选地，该管座单元还包括设置在所述框体内的管件安装部，所述管件安装部位于所述第一筋板和第二筋板的相交处。 Preferably, the header unit further includes a tube mounting portion disposed in the frame, the tube mounting portion being located at an intersection of the first rib and the second rib.
优选地，所述数个管件安装部包括位于所述框体内中部的仪表管安装孔以及位于所述仪表管安装孔周围的导向管安装孔。 Preferably, the plurality of tube mounting portions include an instrument tube mounting hole located in a middle portion of the frame body and a guide tube mounting hole located around the instrument tube mounting hole.
优选地，该管座单元为下管座，其还包括连接在所述框体拐角处下方的支腿。 Preferably, the header unit is a lower header, which further includes a leg connected below the corner of the frame.
优选地，所述支腿上还设有纵向贯通至所述框体的通孔。 Preferably, the leg is further provided with a through hole extending longitudinally to the frame.
优选地，该管座单元为上管座或格架。 Preferably, the header unit is an upper header or grid.
优选地，该管座单元还包括覆盖在所述框体上的防异物板，纵向通过所述流水孔的部分流体在所述防异物板阻挡下通过所述横流孔实现横向流动； Preferably, the stem unit further includes an anti-fouling plate covering the frame body, and a part of the fluid longitudinally passing through the water-flow hole is laterally flowed through the cross-flow hole under the blockage of the anti-foreign material plate;
所述防异物板包括基板以及分布在所述基板上的过滤孔组及安装孔组，所述安装孔组与所述管件安装部对应设置。 The anti-foreign board includes a substrate and a filter hole group and a mounting hole group distributed on the substrate, and the mounting hole group is disposed corresponding to the tube mounting portion.
优选地，所述过滤孔组中的过滤孔孔径小于所述流水孔孔径。 Preferably, the filter hole diameter in the filter hole group is smaller than the flow hole diameter.
本发明的燃料组件管座单元中，在框体中的流水孔之间设置横流孔，解决现有技术中阻流面积突然增大或突然减少的缺点，容许流体在进入防异物板之前可以横向流动，均衡流场，解决了现有技术因为流场不均引发的强横向流。 In the fuel assembly header unit of the present invention, a cross flow hole is provided between the water holes in the frame body, which solves the shortcoming of sudden increase or sudden decrease of the flow blocking area in the prior art, and allows the fluid to be laterally before entering the foreign body prevention plate. The flow and equilibrium flow field solves the strong lateral flow caused by the uneven flow field in the prior art.
附图说明DRAWINGS
下面将结合附图及实施例对本发明作进一步说明，附图中：  The present invention will be further described below in conjunction with the accompanying drawings and embodiments, in which:
图1是现有技术中下管座的截面结构示意图； 1 is a schematic cross-sectional structural view of a lower header in the prior art;
图2a是现有技术的燃料组件中流体的流向示意图； Figure 2a is a schematic illustration of the flow direction of a fluid in a prior art fuel assembly;
图2b是现有技术中下管座中阻流面积的变化图； Figure 2b is a diagram showing the change of the flow blocking area in the lower header in the prior art;
图3是本发明一实施例的燃料组件管座单元在燃料组件中的结构示意图； 3 is a schematic structural view of a fuel assembly header unit in a fuel assembly according to an embodiment of the present invention;
图4是图3所示管座单元中框体的断面结构示意图； Figure 4 is a schematic cross-sectional view of the frame body of the stem unit shown in Figure 3;
图5是本发明另一实施例的燃料组件管座单元在燃料组件中的结构示意图； 5 is a schematic structural view of a fuel assembly header unit in a fuel assembly according to another embodiment of the present invention;
图6是图5所示管座单元中阻流面积的变化图。  Figure 6 is a graph showing changes in the flow restriction area in the stem unit shown in Figure 5.
具体实施方式detailed description
为了对本发明的技术特征、目的和效果有更加清楚的理解，现对照附图详细说明本发明的具体实施方式。 For a better understanding of the technical features, objects and effects of the present invention, the embodiments of the present invention are described in detail with reference to the accompanying drawings.
如图3、4所示，本发明一实施例的燃料组件管座单元，包括上下通透的框体20、数个第一筋板21和数个第二筋板22，数个第一筋板21和数个第二筋板22分别在框体20内平行间隔排列。第一筋板21和第二筋板22呈交错设置，在框体20内分隔出供流体纵向通过的流水孔23，流水孔23也上下通透。第一筋板21和/或第二筋板22开设有供流体横向通过的横流孔24，横流孔24连通位于其两侧的两个流水孔23；当流体纵向通过流水孔23时，部分流体还可通过横流孔24在流水孔23之间横向流动，使得整个流场均衡，还有效降低压降。 As shown in FIGS. 3 and 4, a fuel assembly base unit according to an embodiment of the present invention includes a frame 20 that is vertically permeable, a plurality of first ribs 21, and a plurality of second ribs 22, and a plurality of first ribs. The plate 21 and the plurality of second ribs 22 are respectively arranged in parallel in the frame body 20. The first rib 21 and the second rib 22 are staggered, and a water hole 23 through which the fluid passes longitudinally is partitioned in the frame 20, and the water hole 23 is also vertically permeable. The first rib 21 and/or the second rib 22 are provided with a transverse flow hole 24 through which the fluid passes, the transverse flow hole 24 communicating with the two flow holes 23 on both sides thereof; when the fluid longitudinally passes through the flow hole 23, part of the fluid It is also possible to flow laterally between the flow holes 23 through the cross flow holes 24, so that the entire flow field is equalized, and the pressure drop is also effectively reduced.
框体20可呈正方形、长方形、正五边形或正六边形等形状。第一筋板21和第二筋板22在框体20内可与框体20一体成型，整体结构强度高。第一筋板21和第二筋板22可分别与框体20的对角线平行、或与框体20的侧板平行。 The frame 20 may have a shape such as a square, a rectangle, a regular pentagon or a regular hexagon. The first rib 21 and the second rib 22 are integrally formed with the frame 20 in the casing 20, and the overall structural strength is high. The first rib 21 and the second rib 22 may be parallel to the diagonal of the frame 20 or parallel to the side plates of the frame 20, respectively.
第一筋板21和第二筋板22的纵向面积构成流水孔23的侧壁，横流孔24位于相邻两个流水孔23之间的侧壁上。在流水孔23中，横流孔24可位于其一侧壁或多个侧壁上。位于***（临近框体20）的流水孔23的侧壁则由第一筋板21、第二筋板22和框体20的侧板构成，侧板上不设横流孔。 The longitudinal areas of the first rib 21 and the second rib 22 constitute the side walls of the flow holes 23, and the lateral flow holes 24 are located on the side walls between the adjacent two flow holes 23. In the flow hole 23, the lateral flow hole 24 may be located on one side wall or a plurality of side walls thereof. The side wall of the water injection hole 23 located at the outer periphery (near the frame body 20) is composed of the first rib 21, the second rib 22, and the side plates of the frame 20, and the side plates are not provided with lateral flow holes.
在本实施例中，横流孔24位于第一筋板21和/或第二筋板22的上端，其自第一筋板21和/或第二筋板22的上端端面向下端方向延伸。当然，横流孔24也可位于第一筋板21和/或第二筋板22的下端，其自第一筋板21和/或第二筋板22的下端端面向上端方向延伸。 In the present embodiment, the lateral flow holes 24 are located at the upper ends of the first ribs 21 and/or the second ribs 22, and extend from the upper end faces of the first ribs 21 and/or the second ribs 22 to the lower end direction. Of course, the lateral flow holes 24 may also be located at the lower ends of the first ribs 21 and/or the second ribs 22, extending from the lower end faces of the first ribs 21 and/or the second ribs 22 in the upward end direction.
横流孔24的开口端横向贯通流水孔23的横向尺寸，使得横流孔24的开口端尺寸和流水孔23的横向尺寸大致相同。优选地，横流孔24的尺寸自其开口端到其底部逐渐缩小，这样使得管座单元中阻流面积呈逐渐减小或逐渐增大的趋势，压降低，而不是突然减小或突然增大而导致压降高。其中，横流孔尺寸的逐渐缩小设置，使得横流孔24呈马鞍形、U形、或V形、抛物线形或半圆形等形状。 The open end of the lateral flow hole 24 extends transversely across the lateral dimension of the flow hole 23 such that the open end dimension of the lateral flow hole 24 is substantially the same as the lateral dimension of the flow hole 23. Preferably, the size of the cross flow hole 24 is gradually reduced from the open end to the bottom thereof, so that the flow blocking area in the stem unit gradually decreases or gradually increases, and the pressure decreases, instead of suddenly decreasing or suddenly increasing. And the pressure drop is high. Wherein, the size of the cross-flow hole is gradually reduced, so that the lateral flow hole 24 has a saddle shape, a U shape, or a V shape, a parabola shape or a semicircular shape.
参考图3，通过流水孔23之间横流孔24的设置，流体在通过框体20时，在沿着流水孔23纵向流动时还通过横流孔24实现横向流动，均衡流场。流体在通过框体20后流向燃料棒3时，由于流场均匀，使得燃料棒3间的横向流弱（如图3中箭头C所示），减少或避免燃料棒3的流致振动。 Referring to Fig. 3, through the arrangement of the cross flow holes 24 between the flow holes 23, the fluid flows laterally along the flow holes 23 while passing through the frame 20, and lateral flow is also achieved through the flow holes 23 to equalize the flow field. When the fluid flows to the fuel rod 3 after passing through the frame 20, the lateral flow between the fuel rods 3 is weak (as indicated by an arrow C in Fig. 3) due to the uniform flow field, and the flow-induced vibration of the fuel rod 3 is reduced or avoided.
该管座单元还包括设置在框体20内的管件安装部（未图示），管件安装部位于第一筋板21和第二筋板22的相交处。 The header unit further includes a tube mounting portion (not shown) provided in the housing 20, and the tube mounting portion is located at the intersection of the first rib 21 and the second rib 22.
数个管件安装部可包括位于框体20内中部的仪表管安装孔以及位于仪表管安装孔周围的导向管安装孔；仪表管安装孔供燃料组件的仪表管插接，导向管安装孔供燃料组件的导向管插接。仪表管安装孔和数个导向管安装孔在第一筋板21和第二筋板22上等间距阵列排列。 The plurality of pipe fittings may include an instrument pipe mounting hole located in a middle portion of the frame body 20 and a guide pipe mounting hole located around the instrument pipe mounting hole; the instrument pipe mounting hole is inserted into the instrument pipe of the fuel assembly, and the guiding pipe mounting hole is provided for fuel The guide tube of the assembly is plugged. The instrument tube mounting hole and the plurality of guide tube mounting holes are arranged in an equally spaced array on the first rib 21 and the second rib 22.
在本实施例中，该管座单元为下管座，其还包括连接在框体20拐角处下方的支腿25，用于支撑在下堆芯板2上。支腿25可与框体20一体成型。冷却水等流体从下堆芯板2向上流至该下管座，从流水孔23通过后与燃料组件的燃料棒3接触并冷却燃料棒3。 In the present embodiment, the header unit is a lower header, which further includes legs 25 connected below the corners of the frame 20 for supporting on the lower core plate 2. The leg 25 can be integrally formed with the frame 20. Fluid such as cooling water flows upward from the lower core plate 2 to the lower header, passes through the flow hole 23, contacts the fuel rod 3 of the fuel assembly, and cools the fuel rod 3.
优选地，支腿25上还设有纵向贯通至框体20的通孔250。通孔250同样可供冷却水等流体通过，提高整个管座单元的流通面积。通孔250的尺寸可大于流水孔23的尺寸，由于通孔250位于框体20的角落处，因此流体通过通孔250的流速相对较小，其中的异物不容易对覆盖在框体20上的防异物板造成危害。 Preferably, the leg 25 is further provided with a through hole 250 extending longitudinally to the frame 20. The through hole 250 is also capable of passing a fluid such as cooling water to increase the flow area of the entire stem unit. The size of the through hole 250 may be larger than the size of the flow hole 23. Since the through hole 250 is located at a corner of the frame 20, the flow rate of the fluid through the through hole 250 is relatively small, and the foreign matter therein is not easily covered on the frame 20. The foreign board prevents damage.
进一步地，该管座单元还包括覆盖在框体20上的防异物板26，用于滤去流体中的异物；纵向通过流水孔23的部分流体在防异物板26阻挡下通过横流孔24实现横向流动，减少了防异物板26的阻流面积，增加了流通面积。该防异物板26受框体20的侧板顶部、第一筋板21及第二筋板22顶部的稳固支撑，其形状与框体20形状相匹配，从而能够吻合的覆盖在框体20上。位于第一筋板21和/或第二筋板22上端的横流孔24的开口端连通至防异物板26，横流孔24和异物板26之间形成横向通道，纵向通过流水孔23的流体在该横向通道内流动，并可在流动过程中通过防异物板26上的过滤孔组往上流动。为防止防异物板26整体强度受横流的影响，其厚度可在原基础上增大。 Further, the header unit further includes an anti-fouling plate 26 covering the frame 20 for filtering foreign matter in the fluid; a part of the fluid passing through the flow hole 23 in the longitudinal direction is blocked by the anti-object plate 26 through the cross-flow hole 24. The lateral flow reduces the flow blocking area of the foreign matter prevention plate 26 and increases the flow area. The anti-foreign board 26 is firmly supported by the top of the side panel of the frame 20, the tops of the first ribs 21 and the second ribs 22, and has a shape matching with the shape of the frame 20 so as to be conformable to the frame 20 . The open end of the lateral flow hole 24 at the upper end of the first rib 21 and/or the second rib 22 communicates with the foreign matter prevention plate 26, and a lateral passage is formed between the lateral flow hole 24 and the foreign matter plate 26, and the fluid longitudinally passing through the flow hole 23 is The lateral passage flows and can flow upward through the filter hole group on the foreign matter prevention plate 26 during the flow. In order to prevent the overall strength of the foreign matter preventing plate 26 from being affected by the cross flow, the thickness thereof may be increased on the original basis.
防异物板26可包括基板261以及分布在基板261上的过滤孔组及安装孔组（未图示），流体经过过滤孔组的过滤后往上流动至燃料棒3。过滤孔组包括多个过滤孔262，过滤孔组中的过滤孔262孔径小于流水孔23孔径，以过滤流体中较小尺寸的异物。 The foreign matter prevention plate 26 may include a substrate 261 and a filter hole group and a mounting hole group (not shown) distributed on the substrate 261, and the fluid flows through the filter hole group and flows upward to the fuel rod 3. The filter well set includes a plurality of filter holes 262, and the filter holes 262 in the filter hole set have a smaller pore size than the flow holes 23 to filter foreign matter of a smaller size in the fluid.
安装孔组与管件安装部对应设置。具体地，安装孔组包括与仪表管安装孔对应连连通的第一安装孔、以及与导向管安装孔对应连连通的第二安装孔。燃料组件安装时，仪表管的下端可穿过第一安装孔而插接在仪表管安装孔上，导向管的下端可穿过第二安装孔而插接在导向管安装孔上。应理解，对于一些不设仪表管的燃料组件，仪表管安装孔和第一安装孔则供导向管插接。 The mounting hole group is set corresponding to the pipe fitting mounting portion. Specifically, the mounting hole group includes a first mounting hole that communicates with the instrument tube mounting hole, and a second mounting hole that communicates with the guide tube mounting hole. When the fuel assembly is installed, the lower end of the instrument tube can be inserted through the first mounting hole and inserted into the instrument tube mounting hole, and the lower end of the guiding tube can be inserted into the guiding tube mounting hole through the second mounting hole. It should be understood that for some fuel assemblies that do not have an instrument tube, the instrument tube mounting holes and the first mounting holes are for the guide tubes to be inserted.
如图5所示，本发明另一实施例的燃料组件管座单元，该实施例不同上述图所示实施例的在于：横流孔24位于第一筋板21和/或第二筋板22的上端和下端。上端上的横流孔24和下端上的横流孔24之间相隔绝，不连通。通过上端和下端上横流孔24的叠加设置，加强流体在流水孔23之间的横向流动，更进一步均衡流场。 As shown in FIG. 5, a fuel assembly base unit according to another embodiment of the present invention is different from the embodiment shown in the above figure in that the cross flow hole 24 is located at the first rib 21 and/or the second rib 22. Upper and lower ends. The horizontal flow hole 24 on the upper end and the horizontal flow hole 24 on the lower end are isolated from each other and are not connected. By the superimposed arrangement of the cross-flow holes 24 on the upper and lower ends, the lateral flow of the fluid between the flow holes 23 is enhanced to further balance the flow field.
参考图6，其示出了本实施例中阻流面积的变化。其中，D1、D2及D3分别代表框体区域、防异物板区域及导向管区域。结合图5、6，在D1中，流体通过上端和下端横流孔24的横向流动，在流体进入流水孔23时，阻流面积逐渐增大，在流体流出流水孔23时，阻流面积逐渐减小；在经过D2后，在D3时平稳，且较于通过框体20时的变化较小，降低压降。 Referring to Figure 6, there is shown a change in the flow blocking area in this embodiment. Among them, D1, D2, and D3 represent a frame area, an anti-foreign board area, and a guide tube area, respectively. 5 and 6, in D1, the fluid flows through the lateral flow of the upper end and the lower end transverse flow hole 24. When the fluid enters the flow hole 23, the flow blocking area gradually increases, and when the fluid flows out of the flow hole 23, the flow blocking area gradually decreases. Small; after passing D2, it is stable at D3 and smaller than the change when passing through the frame 20, reducing the pressure drop.
可以理解地，本发明的管座单元不限于下管座。在其他实施例中，该管座单元可为燃料组件的上管座或格架。 It will be appreciated that the header unit of the present invention is not limited to the lower header. In other embodiments, the header unit can be an upper header or grid of the fuel assembly.
以上所述仅为本发明的实施例，并非因此限制本发明的专利范围，凡是利用本发明说明书及附图内容所作的等效结构或等效流程变换，或直接或间接运用在其他相关的技术领域，均同理包括在本发明的专利保护范围内。 The above is only the embodiment of the present invention, and is not intended to limit the scope of the invention, and the equivalent structure or equivalent process transformation of the present invention and the contents of the drawings may be directly or indirectly applied to other related technologies. The fields are all included in the scope of patent protection of the present invention.

Claims (10)

  1. 一种燃料组件管座单元，包括上下通透的框体（20）、在所述框体（20）内的数个平行间隔排列的第一筋板（21）和数个平行间隔排列的第二筋板（22）；所述第一筋板（21）和所述第二筋板（22）呈交错设置，在所述框体（20）内分隔出供流体纵向通过的流水孔（23）；其特征在于，A fuel assembly base unit includes a frame (20) that is vertically permeable, a plurality of first ribs (21) arranged in parallel in the frame (20), and a plurality of parallel spaced a second rib plate (22); the first rib plate (21) and the second rib plate (22) are staggered, and a water hole for longitudinally passing through the fluid is partitioned in the frame body (20) (23) ); characterized in that
    所述第一筋板（21）和/或所述第二筋板（22）开设有供所述流体横向通过的横流孔（24），所述横流孔（24）连通位于其两侧的两个所述流水孔（23）。 The first rib (21) and/or the second rib (22) are provided with a cross flow hole (24) for laterally passing the fluid, and the horizontal flow hole (24) communicates with two sides on both sides thereof The water holes (23).
  2. 根据权利要求1所述的燃料组件管座单元，其特征在于，所述横流孔（24）位于所述第一筋板（21）和/或所述第二筋板（22）的上端和/或下端。The fuel assembly header unit according to claim 1, wherein said cross flow hole (24) is located at an upper end of said first rib (21) and/or said second rib (22) and/or Or the lower end.
  3. 根据权利要求2所述的燃料组件管座单元，其特征在于，所述横流孔（24）自所述第一筋板（21）和/或所述第二筋板（22）的上端端面向下端方向延伸、和/或自所述第一筋板（21）和/或所述第二筋板（22）的下端端面向上端方向延伸；The fuel assembly header unit according to claim 2, wherein said lateral flow hole (24) faces from an upper end end of said first rib (21) and/or said second rib (22) Extending in a lower end direction, and/or extending from an end surface of the first rib (21) and/or the second rib (22) to an upper end;
    所述横流孔（24）的开口端横向贯通所述流水孔（23）的横向尺寸；所述横流孔（24）的尺寸自其开口端到其底部逐渐缩小。The open end of the lateral flow hole (24) transversely penetrates the lateral dimension of the flow hole (23); the size of the horizontal flow hole (24) gradually decreases from the open end to the bottom thereof.
  4. 根据权利要求1所述的燃料组件管座单元，其特征在于，该管座单元还包括设置在所述框体（20）内的管件安装部，所述管件安装部位于所述第一筋板（21）和第二筋板（22）的相交处。The fuel assembly base unit according to claim 1, wherein the base unit further comprises a pipe mounting portion disposed in the frame body (20), the pipe fitting portion being located at the first rib plate The intersection of (21) and the second rib (22).
  5. 根据权利要求4所述的燃料组件管座单元，其特征在于，所述数个管件安装部包括位于所述框体（20）内中部的仪表管安装孔以及位于所述仪表管安装孔周围的导向管安装孔。The fuel assembly header unit according to claim 4, wherein said plurality of tube mounting portions comprise an instrument tube mounting hole in a middle portion of said frame body (20) and a periphery of said instrument tube mounting hole Guide tube mounting holes.
  6. 根据权利要求1所述的燃料组件管座单元，其特征在于，该管座单元为下管座，其还包括连接在所述框体（20）拐角处下方的支腿（25）。The fuel assembly header unit of claim 1 wherein the header unit is a lower header, further comprising a leg (25) coupled below the corner of the frame (20).
  7. 根据权利要求6所述的燃料组件管座单元，其特征在于，所述支腿（25）上还设有纵向贯通至所述框体（20）的通孔（250）。The fuel assembly base unit according to claim 6, wherein the leg (25) is further provided with a through hole (250) extending longitudinally to the frame (20).
  8. 根据权利要求1所述的燃料组件管座单元，其特征在于，该管座单元为上管座或格架。The fuel assembly header unit of claim 1 wherein the header unit is an upper header or grid.
  9. 根据权利要求1-7任一项所述的燃料组件管座单元，其特征在于，该管座单元还包括覆盖在所述框体（20）上的防异物板（26），纵向通过所述流水孔（23）的部分流体在所述防异物板（26）阻挡下通过所述横流孔（24）实现横向流动；A fuel assembly base unit according to any one of claims 1 to 7, wherein the base unit further comprises an anti-fouling plate (26) covering the frame (20), longitudinally passing through the Part of the fluid of the flow hole (23) is laterally flowed through the transverse flow hole (24) under the blockage of the foreign matter prevention plate (26);
    所述防异物板（26）包括基板（261）以及分布在所述基板（261）上的过滤孔组及安装孔组，所述安装孔组与所述管件安装部对应设置。The anti-foreign board (26) includes a substrate (261) and a filter hole group and a mounting hole group distributed on the substrate (261), and the mounting hole group is disposed corresponding to the tube mounting portion.
  10. 根据权利要求9所述的燃料组件管座单元，其特征在于，所述过滤孔组中的过滤孔（262）孔径小于所述流水孔（23）孔径。The fuel assembly header unit according to claim 9, wherein the filter hole (262) in the filter hole group has a smaller pore size than the flow hole (23).
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CN112185601A (en) * 2020-09-30 2021-01-05 中国核动力研究设计院 Reactor double-plate flow-equalizing flow distribution device and flow distribution structure
US20220406476A1 (en) * 2019-10-04 2022-12-22 Framatome Nuclear fuel assembly bottom end part debris filter and method of manufacturing such a debris filter
CN115588518A (en) * 2022-10-10 2023-01-10 中国核动力研究设计院 Nuclear fuel assembly lower pipe seat based on streamline filter rod structure

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CN112185601A (en) * 2020-09-30 2021-01-05 中国核动力研究设计院 Reactor double-plate flow-equalizing flow distribution device and flow distribution structure
CN112185601B (en) * 2020-09-30 2022-02-01 中国核动力研究设计院 Reactor double-plate flow-equalizing flow distribution device and flow distribution structure
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CN115588518B (en) * 2022-10-10 2024-03-19 中国核动力研究设计院 Nuclear fuel assembly lower tube seat based on streamline filter rod structure

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