WO2018053812A1 - 外条带、核反应堆燃料组件的定位格架及核反应堆燃料组件 - Google Patents

外条带、核反应堆燃料组件的定位格架及核反应堆燃料组件 Download PDF

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Publication number
WO2018053812A1
WO2018053812A1 PCT/CN2016/099922 CN2016099922W WO2018053812A1 WO 2018053812 A1 WO2018053812 A1 WO 2018053812A1 CN 2016099922 W CN2016099922 W CN 2016099922W WO 2018053812 A1 WO2018053812 A1 WO 2018053812A1
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WO
WIPO (PCT)
Prior art keywords
outer strip
grid
fuel assembly
strip
nuclear reactor
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Application number
PCT/CN2016/099922
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English (en)
French (fr)
Inventor
卢志威
刘彤
任啟森
李雷
李云
Original Assignee
中广核研究院有限公司
中国广核集团有限公司
中国广核电力股份有限公司
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Application filed by 中广核研究院有限公司, 中国广核集团有限公司, 中国广核电力股份有限公司 filed Critical 中广核研究院有限公司
Priority to PCT/CN2016/099922 priority Critical patent/WO2018053812A1/zh
Publication of WO2018053812A1 publication Critical patent/WO2018053812A1/zh

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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
    • G21C3/322—Means to influence the coolant flow through or around the bundles
    • 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 present invention relates to the field of nuclear reactor technology, and more particularly to an outer strip, a positioning grid for a nuclear reactor fuel assembly, and a nuclear reactor fuel assembly.
  • fuel assemblies used in nuclear power plants at home and abroad generally consist of a skeleton and a fuel rod
  • the skeleton generally consists of an upper tube seat, a lower tube holder, a positioning grid, a guiding tube, an instrument tube, and a connecting member, all of which are
  • the positioning grid is fixed on the guiding tube and the instrument tube at a certain distance along the axial direction of the fuel assembly. All the positioning grids have the same grid unit arrangement and quantity, and the fuel rod, the guiding tube and the instrument tube are worn one by one along the axial direction of the fuel assembly.
  • a grid unit that passes through the same position of each positioning grid.
  • the transverse section of the outer strip on the outer circumference is a periodically bent structure that is bent into the grid unit, because the bending structure penetrates the entire outer strip.
  • the axial height reduces the overall buckling resistance of the spacer grid, which brings the following problems:
  • the outer strip region of the existing spacer grid has substantially no projected area in the vertical direction (removing the projection of the strip thickness), so that the outer strip does not substantially cause a mixing effect on the coolant.
  • the technical problem to be solved by the present invention is to provide a positioning grid for a nuclear reactor fuel assembly, an outer strip for improving the buckling strength and mixing performance of the positioning grid, and a positioning grid having the outer strip. And nuclear reactor fuel assemblies.
  • An outer strip is provided for a positioning grid of a nuclear reactor fuel assembly, and the outer strip includes a connected upper side portion and an intermediate portion in a longitudinal direction. And a lower side portion, wherein the upper side portion and/or the lower side portion are provided with a plurality of guiding portions convexly formed on the same side of the plane of the intermediate portion, and the plurality of the guiding portions are spaced apart along the longitudinal direction of the outer strip;
  • the intermediate portion is connected in a plate shape between the upper side portion and the lower side portion.
  • the outer edge of the guiding portion protrudes away from the intermediate portion to form a guiding wing.
  • the width of the guide wing gradually decreases from an end connecting the intermediate portion to an end away from the intermediate portion.
  • an angle between a plane where the edge of the guide wing is located and a horizontal plane is greater than or equal to 50 degrees.
  • the guide portion is formed on the upper side portion and/or the lower side portion by punching.
  • a bottom surface of the guiding portion that is in contact with the intermediate portion is inclined with respect to a plane in which the intermediate portion is located
  • an angle between the guiding slope and a plane where the intermediate portion is located is less than 45 degrees.
  • the present invention also provides a locating grid for a nuclear reactor fuel assembly, comprising the outer strip of any of the above, a plurality of parallel spaced first inner strips disposed within the outer strip, and a second inner strip that is spaced apart in parallel; the first inner strip and the second inner strip intersect each other to form a grid-like grid unit.
  • the guiding portion of the outer strip is located at an adjacent cell junction of the grid unit.
  • an upper portion of the first inner strip is provided with a plurality of spaced convex first mixing wings; the first mixing wings are obliquely bent in a lateral direction and extend into a grid of the grating unit Within the yuan
  • an upper portion of the second inner strip is provided with a plurality of spaced protruding second mixing wings; the second mixing wing is obliquely bent in a lateral direction and extends into the outermost ring of the grid unit Within the cell.
  • the adjacent first and second mixing wings extend into different cells of the grid unit [0021]
  • the present invention also provides a nuclear reactor fuel assembly, comprising the positioning grid of any of the above.
  • the upper side portion and/or the lower side portion of the outer strip are provided with a convexly formed guiding portion, and the intermediate portion is plate-shaped and is not bent, thereby improving the overall buckling resistance of the positioning grid and improving Safe operation margin of the fuel assembly under reactor accident conditions; reduce the gap between the outer strips of adjacent positioning grids, reduce the flow of coolant from the gap between adjacent positioning grids, and ensure more coolant The ground flow participates in the internal mixing of the positioning grid, thereby having better coolant mixing performance and improving the thermal operation safety margin of the reactor.
  • the bottom surface of the guiding portion and the intermediate portion is inclined, and a certain additional mixing effect is exerted on the coolant flowing through the region, thereby further enhancing the heat exchange effect of the fuel rod and improving the safety operation margin of the reactor heat.
  • FIG. 1 is a top plan view showing a positioning grid of a nuclear reactor fuel assembly according to an embodiment of the present invention
  • FIG. 2 is a plan view showing a partial structure of the positioning grid shown in FIG. 1;
  • Figure 3 is a front elevational view of Figure 2;
  • Figure 4 is a side view of Figure 2;
  • FIG. 5 is a partial plan view of a positioning grid of a nuclear reactor fuel assembly according to another embodiment of the present invention.
  • FIG. 6 is a front view of FIG. 5;
  • FIG. 7 is a schematic structural view of a nuclear reactor fuel assembly according to an embodiment of the present invention.
  • FIG. 8 is a partial structural schematic view of two adjacent turns of a nuclear reactor fuel assembly according to an embodiment of the present invention.
  • a positioning grid 1 of a nuclear reactor fuel assembly includes an outer strip 10 and a plurality of parallel spaced first inner strips 20 disposed in the outer strip 10. And a plurality of second inner strips 30 spaced apart in parallel; the first inner strip 20 and the second inner strip 30 intersect each other to form a grid-like grid unit 40
  • the grid unit 40 includes a plurality of adjacently connected cells 41, and the cells 41 are hollow for the fuel rods and the guide tubes to pass through, respectively.
  • the outer strip 10 includes a joined upper side portion 11, an intermediate portion 12 and a lower side portion 13 in the longitudinal direction.
  • the upper portion 11 and/or the lower portion 13 are provided with a plurality of guiding portions 14 which are convexly formed on the same side of the plane of the intermediate portion 12, and the plurality of guiding portions 14 are spaced apart along the longitudinal direction of the outer strip 10;
  • a plate-like connection is provided between the upper side portion 11 and the lower side portion 13, which improves the buckling resistance of the positioning frame.
  • the guide portion 14 is formed on the upper side portion 11 and/or the lower side portion 13 by punching.
  • the guide portion 14 may include a vertical vertical side wall and a bottom surface, and the bottom surface is in contact with the intermediate portion 12.
  • the bottom surface of the guide portion 14 that is in contact with the intermediate portion 12 is inclined with respect to the plane of the intermediate portion 12 (or the side wall of the guide portion 14) to form the guide slope 15.
  • the angle ⁇ between the guiding bevel 15 and the plane of the intermediate portion 12 is less than 45 degrees.
  • the guiding bevel 15 is formed at the punching guide 14 ⁇ such that the outer strip 10 has a certain projected area in the vertical direction (as in the top view of FIG. 1), and exerts an additional mixing effect on the coolant flowing through the region. Thereby enhancing the heat exchange effect of the fuel rod and improving the safe operation margin of the reactor thermal work.
  • the upper side portion 11 and the lower side portion 13 are each provided with a guide portion 14, and the guide portion 14 on the upper side portion 11 and the guide portion 14 on the lower side portion 13 are mirror-symmetrical.
  • the outer edge of the guide portion 14 protrudes away from the intermediate portion 12 to form the guide vane 16.
  • the width of the guide vane 16 gradually decreases from one end of the intermediate portion 12 to the end away from the intermediate portion 12.
  • the guide vanes 16 are spaced apart along the longitudinal direction of the strips 20 so that the outer edges of the upper side portion 11 and/or the lower side portion 13 are serrated.
  • the upper side portion 11 is provided with the guide vanes 16 whose edges are inclined upward on the side surface and have a guiding effect, and the lower side portion 13 is inclined downwardly corresponding to the edge of the guide vane 16 to have a guiding effect.
  • the positioning grid 1 moves axially along the fuel assembly, when the lower edge of the positioning grid 1 located above The upper edge of the lower frame 1 is in contact, because the inclination of the edge of the guide wing 16 forces the two positioning grids 1 to move away from each other, thereby preventing the two positioning grids 1 from being caught.
  • the angle of inclination of the edges of the guide vanes 16 must be sufficiently large to ensure that the load generated by collisions of adjacent nuclear fuel assemblies is not too great.
  • the plane in which the edge of the guide vane 16 is located is an inclined surface whose angle ⁇ with respect to the horizontal plane is greater than or equal to 50 degrees, as shown in FIG.
  • the convex height of the guiding portion 14 relative to the plane of the intermediate portion 12 is also required to be large enough to ensure that the top of the guiding wing 16 is not embedded in the interior of the adjacent positioning grid, distinguishing its own guiding action.
  • the edges of the upper side portion 11 and the lower side portion 13 are further chamfered to reduce the risk of the fuel assembly being caught.
  • the guide portion 14 of the outer strip 10 projects toward the inner side of the grid unit 40. Further, the guide portion 14 is located at the intersection of the adjacent cells 41 of the outermost ring cells 41 of the grid unit 40.
  • the plurality of guiding portions 14 on the outer strip 10 are located at the intersection of each adjacent two of the cells 41 in the outermost ring cell 41 of the grid unit 40. That is, a guide portion 14 is provided at the junction of each of the first inner strips 20 and the outer strips 10, and the intersection of each of the second inner strips 30 and the outer strips 10. Preferably, the distance between adjacent two guiding portions 14 is smaller than the width of one of the cells 41.
  • the first inner strip 20 and the second inner strip 30 are perpendicular to each other.
  • the upper portion of the first inner strip 20 is provided with a plurality of spaced-apart protruding first mixing wings 21, and the first mixing wings 21 are obliquely bent in the lateral direction and extend into the cells 41 of the grating unit 40. Inside, improve the mixing performance of the positioning grid.
  • the upper portion of the second inner strip 30 is also provided with a plurality of spaced second protruding mixing wings 31, and the second mixing wings 31 are obliquely bent in the lateral direction and extend into the cells of the grating unit 40.
  • the mixing of the positioning grid is improved.
  • the adjacent first mixing wings 21 and the second mixing wings 31 extend into different cells 41 of the grid unit 40, ensuring that there is only one mixing wing in each of the cells 41. .
  • the first mixing wings 21 and the second mixing wings 31 are distributed on the first inner strip 20 and the second inner strip 30 in a regular pattern.
  • the first mixing wing 21 and the second mixing wing 31 in the direction parallel to the flow direction of the coolant are inclined in accordance with the flow direction of the coolant.
  • a positioning grid 1 of a nuclear reactor fuel assembly includes an outer strip 10, and a plurality of parallel spaced first inner strips disposed in the outer strip 10. 20 and multiple parallel spaced The second inner strip 30; the first inner strip 20 and the second inner strip 30 intersect each other to form a grid-like grid unit 40.
  • the outer strip 10 includes a joined upper side portion 11, an intermediate portion 12, and a lower side portion 13 in the longitudinal direction.
  • the upper portion 11 and/or the lower portion 13 are provided with a plurality of guiding portions 14 which are convexly formed on the same side of the plane of the intermediate portion 12, and the plurality of guiding portions 14 are spaced apart along the longitudinal direction of the outer strip 10;
  • a plate-like connection is provided between the upper side portion 11 and the lower side portion 13, which improves the buckling resistance of the positioning frame.
  • the outer strip 10 in this embodiment is different from the outer strip 10 in the embodiment shown in FIGS. 1-4 described above: the plurality of guiding portions 14 are located adjacent to the outermost ring cells 41 of the grid unit 40. At the intersection of the two cells 41, a first inner strip 20 or a second inner strip 30 is spaced between the adjacent two guides 14. Preferably, the distance between the adjacent two guiding portions 14 is equal to or greater than the width of one of the cells 41.
  • an upper portion of the first inner strip 20 is provided with a plurality of spaced-apart protruding first mixing wings 21, and the first mixing wings 21 are obliquely bent in the lateral direction and extend into the cells 41 of the grating unit 40. Within, improve the mixing and breeding of the positioning grid.
  • the upper portion of the second inner strip 30 is also provided with a plurality of spaced second protruding mixing wings 31.
  • the second mixing wings 31 are obliquely bent in the lateral direction and protrude into the cells 41 of the grating unit 40 to improve positioning.
  • the mixing performance of the grid The adjacent first mixing wings 21 and the second mixing wings 31 extend into different cells 41 of the grid unit 40, ensuring that there is only one mixing wing in each of the cells 41.
  • the first mixing wings 21 and the second mixing wings 31 are distributed on the first inner strip 20 and the second inner strip 30 in a regular pattern. As shown in Fig. 5, according to the flow direction of the coolant (indicated by an arrow in Fig. 5), the first mixing wing 21 and the second mixing wing 31 in the direction parallel to the flow direction of the coolant are inclined in the same direction. Corresponding to the layout of the first mixing wing 21 and the second mixing wing 31 on the first inner strip 20 and the second inner strip 30, a plurality of guiding portions 14 on the outer strip 10 are spaced apart to ensure adjacent fuel assemblies The horizontal mixing between the two increases the thermal margin of the reactor core.
  • a nuclear reactor fuel assembly according to an embodiment of the present invention includes the above-described embodiment shown in FIGS. 1-4 or the positioning grid 1 of the embodiment shown in FIGS.
  • the nuclear reactor fuel assembly further includes upper and lower headers 2, 3, a plurality of guide tubes 4 and a plurality of fuel rod assemblies 5 disposed opposite each other.
  • a plurality of positioning grids 1 are axially spaced along the fuel assembly at the upper header 2 and the lower header 3
  • the guide tube 4 passes through the positioning grid 1 and is installed between the upper header 2 and the lower header 3, and the fuel rod 5 is clamped in the cell of the positioning grid 1.
  • the lower header 2 may include a mating plate and a support leg connected below the mating plate, the mating plate being provided with a fixing hole for fixing the guide tube and a flow path through which the coolant passes.
  • the upper header 3 may also include a mating plate provided with a fixing hole for fixing the guide tube and a flow path through which the coolant passes.
  • the positioning grid 1 has higher buckling resistance than the conventional positioning grid, when the operating reactor experiences seismic conditions, the fuel assembly can withstand higher earthquakes.
  • the load thus having a higher probability of maintaining a coolable shape under reactor seismic conditions, thereby reducing the reactor core damage and the probability of release of large amounts of radioactive material.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • General Engineering & Computer Science (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Monitoring And Testing Of Nuclear Reactors (AREA)

Abstract

一种外条带、核反应堆燃料组件的定位格架及核反应堆燃料组件，外条带(10)在纵向上包括相连接的上边部(11)、中间部(12)和下边部(13)，所述上边部(11)和/或下边部(13)设有向所述中间部(12)所在平面的同一侧外凸形成多个导向部(14)，多个所述导向部(14)沿所述外条带(10)长度方向间隔分布；所述中间部(12)呈板状连接在所述上边部(11)和下边部(13)之间。外条带(10)的中间部(12)呈板状不弯折，从而提高定位格架(1)整体的防屈曲强度，提高燃料组件在反应堆事故工况下的安全运行裕量；降低相邻定位格架(1)的外条带(10)之间的缝隙，确保冷却剂更多地流向定位格架(1)内部参与搅混，从而具有更好的冷却剂搅混性能，提高了反应堆的热工安全运行裕量。

Description

外条带、 核反应堆燃料组件的定位格架及核反应堆燃料组件
技术领域
[0001] 本发明涉及核反应堆技术领域， 尤其涉及一种外条带、 核反应堆燃料组件的定 位格架及核反应堆燃料组件。
背景技术
[0002] 目前， 国内外的核电厂中使用的燃料组件一般由骨架和燃料棒组成， 骨架一般 由上管座、 下管座、 定位格架、 导向管、 仪表管及连接件等组成， 所有定位格 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， 所有定位格架都有 相同的格栅单元排列和数量， 燃料棒、 导向管和仪表管沿燃料组件轴向逐个穿 过每个定位格架的相同位置的格栅单元。
[0003] 现有的一种定位格架中， 外周上的外条带的横向截面呈周期性的向格栅单元内 弯折的弯折结构， 因该折弯结构贯通了整个外条带的轴向高度， 降低了定位格 架的整体防屈曲强度， 从而带来了以下问题：
[0004] 1、 如果反应堆发生地震等事故工况吋， 堆芯内燃料组件之间的相互碰撞使定 位格架水平方向受到碰撞力， 从而更容易使定位格架在折弯区域发生屈曲， 破 坏定位格架。
[0005] 2、 对反应堆堆芯内的燃料组件进行吊装等操作吋， 当相邻燃料组件在水平位 置上相错 1/2栅元， 定位格架外条带的平面区域 （弯折结构之间的非折弯区域） 容易嵌入相邻燃料组件的燃料棒中间区域， 进而容易造成相邻燃料组件发生钩 挂。
[0006] 3、 燃料组件在堆芯内部相邻放置后， 因为定位格架间较低的流动阻力， 更多 的冷却剂会从相邻定位格架外条带之间流过， 而不参与搅混， 这会降低燃料组 件的冷却效果， 最终降低反应堆的热工安全运行裕量。
[0007] 另外， 现有定位格架的外条带区域基本没有垂直方向的投影面积 （除去条带厚 度的投影） ， 因此外条带基本不会对冷却剂产生搅混作用。 技术问题
[0008] 本发明要解决的技术问题在于， 提供一种用于核反应堆燃料组件的定位格架， 提高定位格架的防屈曲强度及搅混性能的外条带以及具有该外条带的定位格架 及核反应堆燃料组件。
问题的解决方案
技术解决方案
[0009] 本发明解决其技术问题所采用的技术方案是： 提供一种外条带， 用于核反应堆 燃料组件的定位格架， 所述外条带在纵向上包括相连接的上边部、 中间部和下 边部， 所述上边部和 /或下边部设有向所述中间部所在平面的同一侧外凸形成多 个导向部， 多个所述导向部沿所述外条带长度方向间隔分布； 所述中间部呈板 状连接在所述上边部和下边部之间。
[0010] 优选地， 所述导向部的外边缘向远离所述中间部的方向凸出， 形成导向翼。
[0011] 优选地， 所述导向翼的宽度自连接所述中间部的一端向远离所述中间部的一端 逐渐递减。
[0012] 优选地， 所述导向翼边缘所在的平面与水平面之间的夹角大于或等于 50度。
[0013] 优选地， 所述导向部通过冲压形成在所述上边部和 /或下边部上。
[0014] 优选地， 与所述中间部相接的所述导向部的底面相对所述中间部所在平面倾斜
， 形成导向斜面。
[0015] 优选地， 所述导向斜面与所述中间部所在平面之间的夹角小于 45度。
[0016] 本发明还提供一种核反应堆燃料组件的定位格架， 包括以上任一项所述的外条 带、 设置在所述外条带内的多个平行间隔的第一内条带和多个平行间隔的第二 内条带； 所述第一内条带和第二内条带相互交叉形成网络状的格栅单元。
[0017] 优选地， 所述外条带的导向部位于所述格栅单元的相邻的栅元交接处。
[0018] 优选地， 所述第一内条带的上部设有多个间隔的凸出的第一搅混翼； 所述第一 搅混翼在横向上倾斜弯折伸入所述格栅单元的栅元内；
[0019] 所述第二内条带的上部设有多个间隔的凸出的第二搅混翼； 所述第二搅混翼在 横向上倾斜弯折伸入所述格栅单元最外圈栅元的栅元内。
[0020] 优选地， 相邻的所述第一搅混翼和第二搅混翼伸入所述格栅单元的不同栅元内 [0021] 本发明还提供一种核反应堆燃料组件， 其特征在于， 包括以上任一项所述的定 位格架。
发明的有益效果
有益效果
[0022] 本发明的有益效果： 外条带上边部和 /或下边部设有外凸形成的导向部， 中间 部呈板状， 不弯折， 从而提高定位格架整体的防屈曲强度， 提高燃料组件在反 应堆事故工况下的安全运行裕量； 降低相邻定位格架的外条带之间的缝隙， 减 少冷却剂从相邻定位格架之间的缝隙流过， 确保冷却剂更多地流向定位格架内 部参与搅混， 从而具有更好的冷却剂搅混性能， 提高了反应堆的热工安全运行 裕量。
[0023] 导向部与中间部连接的底面呈倾斜状， 会对流经该区域的冷却剂起到一定的额 外的搅混作用， 从而进一步增强燃料棒的换热效果， 提高反应堆热工安全运行 裕量。
对附图的简要说明
附图说明
[0024] 下面将结合附图及实施例对本发明作进一步说明， 附图中：
[0025] 图 1是本发明一实施例的核反应堆燃料组件的定位格架的俯视结构示意图；
[0026] 图 2是图 1所示定位格架的部分结构俯视图；
[0027] 图 3是图 2的前视图；
[0028] 图 4是图 2的侧视图；
[0029] 图 5是本发明另一实施例的核反应堆燃料组件的定位格架的部分结构俯视图； [0030] 图 6是图 5的前视图；
[0031] 图 7是本发明一实施例的核反应堆燃料组件的结构示意图；
[0032] 图 8是本发明一实施例的核反应堆燃料组件两组相邻吋的部分结构示意图。
本发明的实施方式 [0033] 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。
[0034] 如图 1、 2所示， 本发明一实施例的核反应堆燃料组件的定位格架 1， 包括外条 带 10、 设置在外条带 10内的多个平行间隔的第一内条带 20和多个平行间隔的第 二内条带 30; 第一内条带 20和第二内条带 30相互交叉形成网络状的格栅单元 40
[0035] 格栅单元 40包括多个依次相邻连接的栅元 41， 栅元 41中空， 分别用于燃料棒、 导向管穿过。
[0036] 如图 3、 4所示， 外条带 10在纵向上包括相连接的上边部 11、 中间部 12和下边部 13。 其中， 上边部 11和 /或下边部 13设有向中间部 12所在平面的同一侧外凸形成 多个导向部 14， 多个导向部 14沿外条带 10长度方向间隔分布； 中间部 12呈板状 连接在上边部 11和下边部 13之间， 提高定位格架的防屈曲强度。
[0037] 导向部 14通过冲压形成在上边部 11和 /或下边部 13上。 导向部 14可包括相接的 竖直状的侧壁以及底面， 底面与中间部 12相接。
[0038] 与中间部 12相接的导向部 14的底面相对中间部 12所在平面 （或导向部 14的侧壁 ) 倾斜， 形成导向斜面 15。 优选地， 导向斜面 15与中间部 12所在平面之间的夹 角 α小于 45度。 该导向斜面 15在冲压导向部 14吋形成， 使得外条带 10在垂直方向 上 （如图 1的俯视图） 有一定的投影面积， 对流经该区域的冷却剂起到一定的额 外的搅混作用， 从而增强燃料棒的换热效果， 提高反应堆热工安全运行裕量。
[0039] 本实施例中， 上边部 11和下边部 13均设有导向部 14， 上边部 11上的导向部 14和 下边部 13上的导向部 14呈镜像对称。
[0040] 另外， 导向部 14的外边缘向远离中间部 12的方向凸出， 形成导向翼 16。 导向翼 16的宽度自连接中间部 12的一端向远离中间部 12的一端逐渐递减。 导向翼 16对 应多个导向部 14沿长条带 20长度方向间隔分布， 使得上边部 11和 /或下边部 13的 外边缘呈锯齿状。
[0041] 上边部 11上导向翼 16的设置， 其边缘在侧面上呈向上倾斜， 具有导向作用， 下 边部 13对应导向翼 16的边缘则呈向下倾斜， 具有导向作用。 具体地， 在装卸料 过程中， 定位格架 1沿燃料组件轴向运动， 当位于上方的定位格架 1的下边缘与 位于下方的定位格架 1的上边缘发生接触， 因为导向翼 16边缘的倾斜， 会迫两个 定位格架 1产生互相远离对方的运动轨迹， 从而避免两个定位格架 1发生钩挂。
[0042] 导向翼 16边缘的倾斜角度必须足够大， 从而保证在相邻核燃料组件发生碰撞吋 产生的载荷不会太大。 优选地， 导向翼 16边缘所在的平面为倾斜面， 其与水平 面之间的夹角 β大于或等于 50度， 如图 4中所示。
[0043] 导向部 14相对中间部 12所在平面的外凸高度也需足够大， 确保导向翼 16的顶部 不会嵌入到相邻定位格架的内部， 区别其自身的导向作用。
[0044] 另外， 外条带 10中， 上边部 11和下边部 13的边缘进一步进行倒角处理， 减小燃 料组件发生勾挂的风险。 在定位格架 1上， 外条带 10的导向部 14向格栅单元 40内 侧方向凸出。 并且， 导向部 14位于格栅单元 40最外圈栅元 41的相邻的栅元 41交 接处。
[0045] 如图 2所示， 在本实施例中， 外条带 10上的多个导向部 14位于格栅单元 40最外 圈栅元 41中每相邻两个的栅元 41交接处， 即： 每一个第一内条带 20与外条带 10 的相接处、 每一个第二内条带 30与外条带 10的相接处均设有一个导向部 14。 优 选地， 相邻两个导向部 14之间的距离小于一个栅元 41的宽度。
[0046] 本实施例的定位格架 1中， 第一内条带 20与第二内条带 30相互垂直。
[0047] 进一步地， 第一内条带 20的上部设有多个间隔的凸出的第一搅混翼 21， 第一搅 混翼 21在横向上倾斜弯折伸入格栅单元 40的栅元 41内， 提高定位格架的搅混性 能。
[0048] 优选地， 第二内条带 30的上部也设有多个间隔的凸出的第二搅混翼 31， 第二搅 混翼 31在横向上倾斜弯折伸入格栅单元 40的栅元 41内， 提高定位格架的搅混性 育^ 相邻的第一搅混翼 21和第二搅混翼 31伸入格栅单元 40的不同栅元 41内， 确 保每一栅元 41内只有一个搅混翼。
[0049] 为使得定位格架 1搅混功能最大化， 第一搅混翼 21和第二搅混翼 31以一定规律 分布在第一内条带 20和第二内条带 30上。 根据冷却剂的流向， 位于与冷却剂流 向平行的方向上的第一搅混翼 21和第二搅混翼 31倾斜方向一致。
[0050] 如图 5、 6所示， 本发明另一实施例的核反应堆燃料组件的定位格架 1， 包括外 条带 10、 设置在外条带 10内的多个平行间隔的第一内条带 20和多个平行间隔的 第二内条带 30; 第一内条带 20和第二内条带 30相互交叉形成网络状的格栅单元 4 0。
[0051] 外条带 10在纵向上包括相连接的上边部 11、 中间部 12和下边部 13。 其中， 上边 部 11和 /或下边部 13设有向中间部 12所在平面的同一侧外凸形成多个导向部 14， 多个导向部 14沿外条带 10长度方向间隔分布； 中间部 12呈板状连接在上边部 11 和下边部 13之间， 提高定位格架的防屈曲强度。
[0052] 本实施例中的外条带 10与上述图 1-4所示实施例中外条带 10不同的是： 多个导 向部 14位于格栅单元 40最外圈栅元 41中依次相邻的两个栅元 41交接处， 相邻的 两个导向部 14之间间隔有一个第一内条带 20或一个第二内条带 30。 优选地， 相 邻两个导向部 14之间的距离等于或大于一个栅元 41的宽度。
[0053] 本实施例中， 外条带 10的其他结构等均可参照上述图 1-4所示实施例中所述， 在此不再赘述。
[0054] 进一步地， 第一内条带 20的上部设有多个间隔的凸出的第一搅混翼 21， 第一搅 混翼 21在横向上倾斜弯折伸入格栅单元 40的栅元 41内， 提高定位格架的搅混性 育^。 第二内条带 30的上部也设有多个间隔的凸出的第二搅混翼 31， 第二搅混翼 3 1在横向上倾斜弯折伸入格栅单元 40的栅元 41内， 提高定位格架的搅混性能。 相 邻的第一搅混翼 21和第二搅混翼 31伸入格栅单元 40的不同栅元 41内， 确保每一 栅元 41内只有一个搅混翼。
[0055] 为使得定位格架 1搅混功能最大化， 第一搅混翼 21和第二搅混翼 31以一定规律 分布在第一内条带 20和第二内条带 30上。 如图 5中所示， 根据冷却剂的流向 （图 5中箭头所示） ， 位于与冷却剂流向平行的方向上的第一搅混翼 21和第二搅混翼 31倾斜方向一致。 对应第一搅混翼 21和第二搅混翼 31在第一内条带 20和第二内 条带 30上的布局， 外条带 10上的多个导向部 14间隔布置， 从而保证相邻燃料组 件之间的横向搅混， 提高反应堆芯热工裕量。
[0056] 如图 7所示， 本发明一实施例的核反应堆燃料组件， 包括上述图 1-4所示实施例 或图 5、 6所示实施例的定位格架 1。
[0057] 核反应堆燃料组件还包括相对设置的上管座 2和下管座 3、 数个导向管 4以及数 个燃料棒组 5。 数个定位格架 1沿燃料组件轴向间隔设置在上管座 2和下管座 3之 间， 导向管 4穿过定位格架 1并安装在上管座 2和下管座 3之间， 燃料棒 5夹持于定 位格架 1的栅元之中。
[0058] 下管座 2可包括匹配板和连接在匹配板下方的支撑腿， 匹配板设有用于固定导 向管的固定孔和供冷却剂通过的流道。 上管座 3也可包括匹配板， 匹配板设有用 于固定导向管的固定孔和供冷却剂通过的流道。
[0059] 结合图 3、 5及图 8所示， 该核反应堆燃料组件中， 由于定位格架 1中外条带 10的 特殊设置， 在相邻的两组燃料组件中， 对应相邻的定位格架 1以外条带 10相对， 由于外条带 10具有板状的中间部 12， 减小了相对的外条带 10之间的缝隙 100， 使 得冷却剂更多地流向定位格架 1内部参与搅混， 从而具有更好的冷却剂搅混性能
， 提高了反应堆的热工安全运行裕量。
[0060] 该核反应堆燃料组件中， 由于定位格架 1相比于传统的定位格架具有更高的防 屈曲强度， 当运行中的反应堆经历地震工况吋， 燃料组件相对可以承受更高的 地震载荷， 从而有更高的几率在反应堆地震工况下保持可冷却形状， 进而降低 反应堆堆芯损坏以及大量放射性物质释放的概率。
[0061] 该核反应堆燃料组件中， 通过定位格架 1及其中外条带 10的设置， 具有更好的 热工性能， 有更好的传热效果， 进而可以降低核燃料组件的运行温度， 提高正 常工况下运行裕量， 也可以延迟事故工况下的事故进程， 最终可以减小反应堆 堆芯损坏概率。
[0062] 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。

Claims

权利要求书
[权利要求 1] 一种外条带， 用于核反应堆燃料组件的定位格架， 其特征在于， 所述 外条带在纵向上包括相连接的上边部、 中间部和下边部， 所述上边部 和 /或下边部设有向所述中间部所在平面的同一侧外凸形成多个导向 部， 多个所述导向部沿所述外条带长度方向间隔分布； 所述中间部呈 板状连接在所述上边部和下边部之间。
[权利要求 2] 根据权利要求 1所述的外条带， 其特征在于， 所述导向部的外边缘向 远离所述中间部的方向凸出， 形成导向翼。
[权利要求 3] 根据权利要求 2所述的外条带， 其特征在于， 所述导向翼的宽度自连 接所述中间部的一端向远离所述中间部的一端逐渐递减。
[权利要求 4] 根据权利要求 3所述的外条带， 其特征在于， 所述导向翼边缘所在的 平面与水平面之间的夹角大于或等于 50度。
[权利要求 5] 根据权利要求 1所述的外条带， 其特征在于， 所述导向部通过冲压形 成在所述上边部和 /或下边部上。
[权利要求 6] 根据权利要求 1所述的外条带， 其特征在于， 与所述中间部相接的所 述导向部的底面相对所述中间部所在平面倾斜， 形成导向斜面。
[权利要求 7] 根据权利要求 6所述的外条带， 其特征在于， 所述导向斜面与所述中 间部所在平面之间的夹角小于 45度。
[权利要求 8] 一种核反应堆燃料组件的定位格架， 其特征在于， 包括权利要求 1-7 任一项所述外条带、 设置在所述外条带内的多个平行间隔的第一内条 带和多个平行间隔的第二内条带； 所述第一内条带和第二内条带相互 交叉形成网络状的格栅单元。
[权利要求 9] 根据权利要求 8所述的定位格架， 其特征在于， 所述外条带的导向部 位于所述格栅单元最外圈栅元的相邻的栅元交接处。
[权利要求 10] 根据权利要求 8所述的定位格架， 其特征在于， 所述第一内条带的上 部设有多个间隔的凸出的第一搅混翼； 所述第一搅混翼在横向上倾斜 弯折伸入所述格栅单元的栅元内；
所述第二内条带的上部设有多个间隔的凸出的第二搅混翼； 所述第二 搅混翼在横向上倾斜弯折伸入所述格栅单元的栅元内。
[权利要求 11] 根据权利要求 10所述的定位格架， 其特征在于， 相邻的所述第一搅混 翼和第二搅混翼伸入所述格栅单元的不同栅元内。
[权利要求 12] —种核反应堆燃料组件， 其特征在于， 包括权利要求 8-11任一项所述 的定位格架。
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