WO2013159438A1 - Reactor internals in lower reactor - Google Patents

Reactor internals in lower reactor Download PDF

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Publication number
WO2013159438A1
WO2013159438A1 PCT/CN2012/077178 CN2012077178W WO2013159438A1 WO 2013159438 A1 WO2013159438 A1 WO 2013159438A1 CN 2012077178 W CN2012077178 W CN 2012077178W WO 2013159438 A1 WO2013159438 A1 WO 2013159438A1
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WO
WIPO (PCT)
Prior art keywords
reactor
distribution
distribution ring
plate
component according
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PCT/CN2012/077178
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French (fr)
Chinese (zh)
Inventor
林绍萱
梁叶佳
张明
刘彬
丁宗华
翁羽
余凡
陈宇清
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上海核工程研究设计院
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Publication of WO2013159438A1 publication Critical patent/WO2013159438A1/en

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    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21C—NUCLEAR REACTORS
    • G21C5/00—Moderator or core structure; Selection of materials for use as moderator
    • G21C5/02—Details
    • G21C5/10—Means for supporting the complete structure
    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21C—NUCLEAR REACTORS
    • G21C13/00—Pressure vessels; Containment vessels; Containment in general
    • G21C13/02—Details
    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21C—NUCLEAR REACTORS
    • G21C15/00—Cooling arrangements within the pressure vessel containing the core; Selection of specific coolants
    • G21C15/02—Arrangements or disposition of passages in which heat is transferred to the coolant; Coolant flow control devices
    • 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 a reactor internal component of a lower part of a reactor, in particular to a reactor internal component of a reactor which is simple in structure, uniform in flow distribution, small in drag coefficient and convenient for replacement and maintenance.
  • the pressurized water reactor includes a loop comprising a primary circuit and a secondary circuit, wherein the primary circuit completes the derivation of the reactor heat and conducts it through the steam generator to the secondary circuit to drive the steam turbine to generate electricity.
  • the primary circuit mainly consists of a reactor pressure vessel, a reactor internal component, a fuel assembly, a steam generator, a main pump, and a pipeline.
  • the fuel assembly is placed in a pressure vessel, and the support function is achieved by the internal components of the reactor, and the nuclear fuel maintains a controlled chain fission reaction in the reactor to generate energy.
  • the energy generated by nuclear fission is absorbed by the coolant to achieve cooling of the fuel assembly. After the energy is absorbed, the temperature of the coolant rises.
  • the steam generator is introduced into the steam generator through the main pipe, and the heat is exchanged with the second circuit, and the coolant after the temperature is lowered again into the core.
  • the reactor In order to allow the fuel assembly to be sufficiently cooled, the coolant needs to be uniform before it enters the core, so the reactor is equipped with a flow distribution device.
  • Conventional flow distribution devices are mostly perforated structures, which are formed by stacking one or more orifice plates through a certain support. However, as the volume of the lower chamber is reduced, the flow distribution effect of this structure becomes less desirable, so it is necessary to find a new structure instead.
  • the new type of flow distribution device in foreign countries adopts a combination of ring and tube plate, which is formed by a flow distribution ring that processes a large number of flow holes and an eddy current suppression plate.
  • the flow distribution of this structure is relatively ideal, but since the flow distribution ring is directly welded to the pressure vessel, the replacement is not required throughout the life, and the risk is high. In addition, the resistance coefficient of the structure itself is high.
  • the technical problem to be solved by the present invention is to provide a reactor lower pile internal component which is simple in structure, uniform in flow distribution, small in resistance coefficient, and easy to replace and repair.
  • the present invention includes a reactor internal pressure component, a reactor pressure vessel, a core disposed inside the reactor pressure vessel, and a core supporting lower plate fixed to the bottom of the core;
  • the flow distribution device of the circular hole, the flow distribution device comprises an upper distribution ring, a middle distribution ring fixedly connected to the bottom of the upper distribution ring in the circumferential direction, and a lower distribution plate fixedly connected with the bottom of the middle distribution ring in the circumferential direction;
  • a circular hole having a continuous diameter is continuously disposed on the circumferential side wall of the upper distribution ring.
  • the circumferential side wall of the middle distribution ring is provided with continuously distributed circular holes, and the number of the circular holes in each row is equal and the diameter is the same.
  • the lower distribution plate is rotationally symmetric with a circular hole.
  • the axial height of the upper distribution ring is less than the axial height of the middle distribution ring.
  • the circumferential side wall of the upper distribution ring forms an angle with the horizontal plane that is greater than the angle formed by the circumferential side wall of the middle distribution ring and the horizontal plane.
  • the lower surface of the lower distribution plate is provided with a plurality of energy absorbing devices, and the lower end of the energy absorbing device is provided with an anti-break bottom plate.
  • the bottoms of the upper eversions of the upper distribution ring are located on the same horizontal plane.
  • the flow distribution device is provided with a plurality of support columns whose upper ends are connected to the core support lower plate and the lower end is connected to the lower distribution plate.
  • the uniformity of the core inlet flow distribution is related to whether the core heat can be exported smoothly and directly, which directly determines the location of the core hot spot and the size of the heat pipe factor, and the heat pipe factor is directly related to the entire core.
  • the invention adopts a coated flow distribution device, after the coolant enters from the inlet of the pressure vessel, passes through the annular cavity, enters the flow distribution device of the lower chamber of the reactor, and realizes the steering along the arc surface of the lower head of the pressure vessel.
  • the coolant from the surrounding and bottom surfaces enters the core after a certain degree of mixing in the flow distribution device.
  • the entire flow distribution is caused by the connection of the convex portion and the support column.
  • the device is very rigid and resistant to the lateral impact of the coolant.
  • the invention realizes a good distribution effect of the coolant before entering the core through the round hole with appropriate size, quantity, shape and position on the flow distribution device, reduces the resistance loss along the path, and satisfies the deviation of the inlet flow distribution of the adjacent components. Allowable values, maximum average flow, and other indicators.
  • FIG. 1 is a schematic view showing the structure of a reactor internal pile member provided by the present invention.
  • Figure 2 is a schematic illustration of a flow distribution device in a reactor internal stack assembly provided by the present invention.
  • 1 is the reactor pressure vessel
  • 2 is the core support lower plate
  • 3 is the flow distribution device
  • 4 is the support column
  • 5 is the energy absorption device
  • 6 is the anti-break floor.
  • the invention includes a reactor pressure vessel 1, a core and a flow distribution device 3.
  • the core is placed inside the reactor pressure vessel 1.
  • the core support lower plate 2 is typically a large diameter circular plate on which a fuel assembly locating pin is placed for use as a support fuel assembly.
  • the core support lower plate 2 is machined with a large number of through holes, usually one set of four fuel assemblies. The coolant enters the core through these through holes and cools the core.
  • the flow distribution device 3 includes an upper distribution ring, a middle distribution ring, and a lower distribution plate.
  • the circumferential direction of the upper distribution ring The side wall is provided with a circular hole having a continuous distribution of equal diameters, and the top circumference diameter of the upper distribution ring is larger than the diameter of the lower circumference.
  • the circumferential side wall of the middle distribution ring is provided with continuously distributed circular holes, the number of the circular holes in each row is equal, the diameter is the same, and the diameter of the top circumference of the middle distribution ring is larger than the diameter of the bottom circumference.
  • the lower distribution plate is rotationally symmetric with a circular hole, and the diameter of the lower distribution plate is equal to the diameter of the bottom circumference of the middle distribution ring.
  • the axial height of the upper distribution ring is less than the axial height of the middle distribution ring.
  • the circumferential side wall of the upper distribution ring forms an angle with the horizontal plane that is greater than the angle formed by the circumferential side wall of the middle distribution ring and the horizontal plane.
  • the upper distribution ring, the middle distribution ring and the lower distribution plate are welded together to form a whole, and the processing water hole is avoided near the joint weld to prevent the strength of the weld from being weakened.
  • an integral forging process can be employed, in which case the number of rows of the water holes can be appropriately increased near the joint.
  • the top of the upper distribution ring is provided with a plurality of everted convex portions, and the convex portion of the upper distribution ring is fixedly connected with the core supporting lower plate by bolts or welding.
  • the bottoms of the plurality of everted protrusions of the upper distribution ring are located at the same level for storage of the lower stack internal components.
  • the flow distribution device 3 is provided with a plurality of support columns 4 whose upper ends are connected to the core supporting lower plate by screws, and the lower end and the lower distribution plate are connected by screws.
  • the lower surface of the lower distribution plate is uniformly fixed with four energy absorbing devices 5 by screws, and the lower end of the energy absorbing device 5 is fixed with a break preventing bottom plate 6 by screws.
  • the energy absorbing device 4 is composed of a sleeve, a damper and a guide post.
  • the anti-break floor 5 has a certain gap with the inner wall of the reactor pressure vessel. When a core drop accident occurs, the anti-break floor 5 is in contact with the reactor pressure vessel, and the energy absorbing device 4 is plastically deformed, absorbing some of the energy falling from the core to less impact on the reactor pressure vessel.
  • the coolant enters the reactor through two to four circular inlets on the reactor pressure vessel 1, passes down the annular passage into the lower chamber of the reactor, enters the reactor lower chamber flow distribution device, and is sealed along the reactor pressure vessel 1.
  • the head circular arc surface realizes steering, and enters the flow distribution device 3 through the circular hole of the flow distribution device 3, and the coolant from the surrounding and bottom surfaces enters the core after a certain degree of mixing in the flow distribution device 3, due to the convex portion
  • the connection to the support column 4 provides the entire flow distribution device with a good rigidity sufficient to withstand the lateral impact of the coolant.
  • a circular hole of appropriate size, number, shape and position is set on the flow distribution device 3, so that the coolant enters the core very well.
  • the good distribution effect reduces the resistance loss along the path, and satisfies the inlet flow distribution bias of the adjacent components; the allowable value, the maximum average flow rate and other indicators.

Abstract

Reactor internals in a lower reactor comprise a reactor pressure vessel(1), a reactor core provided in the reactor pressure vessel(1), a supporting lower plate(2) of the reactor core fixed to the bottom of the reactor core and a flow distribution device(3) provided with several circular openings. The flow distribution device(3) comprises an upper distribution plate, a middle distribution ring fixedly connected to the bottom of the upper distribution plate along the periphery direction, a lower distribution plate fixedly connected to the bottom of the middle distribution ring along the periphery direction. Several evaginable protruding sections are provided on the top of the upper distribution ring. The evaginable protruding sections of the upper distribution ring are fixedly connected to the supporting lower plate (2) of the reactor core. The reactor internals in a lower reactor have a simple structure, an even flow distribution and a small resistance coefficient, and are easy to replace and repair.

Description

一种反应堆下部堆内构件 技术领域  Reactor reactor internal component
本发明涉及一种反应堆下部堆内构件， 特别是涉及一种结构简单， 流量 分配均匀， 阻力系数小， 便于更换和维修的反应堆下部堆内构件。  The invention relates to a reactor internal component of a lower part of a reactor, in particular to a reactor internal component of a reactor which is simple in structure, uniform in flow distribution, small in drag coefficient and convenient for replacement and maintenance.
背景技术 说 压水堆包含回路循环包括一回路和二回路， 其中一回路完成了反应堆热 量的导出， 并通过蒸汽发生器传导到二回路推动汽轮机发电。 一回路主要有 反应堆压力容器， 堆内构件， 燃料组件， 蒸汽发生器， 主泵， 管道等组成。 BACKGROUND OF THE INVENTION The pressurized water reactor includes a loop comprising a primary circuit and a secondary circuit, wherein the primary circuit completes the derivation of the reactor heat and conducts it through the steam generator to the secondary circuit to drive the steam turbine to generate electricity. The primary circuit mainly consists of a reactor pressure vessel, a reactor internal component, a fuel assembly, a steam generator, a main pump, and a pipeline.
书  Book
燃料组件放置在压力容器内， 由堆内构件实现支承功能， 核燃料在反应 堆内维持可控的链式裂变反应产生能量。 核裂变产生的能量由冷却剂吸收， 实现对燃料组件的冷却。 吸收能量后的冷却剂温度升高， 在主泵的强制循环 作用下， 经由主管道进入蒸汽发生器， 与二回路进行热量的交换， 温度降低 后的冷却剂重新进入堆芯。  The fuel assembly is placed in a pressure vessel, and the support function is achieved by the internal components of the reactor, and the nuclear fuel maintains a controlled chain fission reaction in the reactor to generate energy. The energy generated by nuclear fission is absorbed by the coolant to achieve cooling of the fuel assembly. After the energy is absorbed, the temperature of the coolant rises. Under the forced circulation of the main pump, the steam generator is introduced into the steam generator through the main pipe, and the heat is exchanged with the second circuit, and the coolant after the temperature is lowered again into the core.
为了令燃料组件得到充分的冷却， 冷却剂在进入堆芯前， 需要保证其均 匀性， 所以一般反应堆都设置了流量分配装置。 传统的流量分配装置多为孔 板式结构， 由一层或多层孔板通过一定的支撑叠加而成。 但是当下腔室容积 减少， 这种结构的流量分配效果变得不再理想， 所以需要寻找新的结构来取 而代之。  In order to allow the fuel assembly to be sufficiently cooled, the coolant needs to be uniform before it enters the core, so the reactor is equipped with a flow distribution device. Conventional flow distribution devices are mostly perforated structures, which are formed by stacking one or more orifice plates through a certain support. However, as the volume of the lower chamber is reduced, the flow distribution effect of this structure becomes less desirable, so it is necessary to find a new structure instead.
国外新型的流量分配装置采用了环、 管板结合的形式， 由一个加工了大 量流水孔的流量分配环和一块涡流抑制板相配合而成。 这种结构的流量分配 相对理想， 但由于流量分配环是直接焊接在压力容器上， 使得整个寿期内不 得更换， 风险性较高， 除此之外， 结构本身的阻力系数较高。  The new type of flow distribution device in foreign countries adopts a combination of ring and tube plate, which is formed by a flow distribution ring that processes a large number of flow holes and an eddy current suppression plate. The flow distribution of this structure is relatively ideal, but since the flow distribution ring is directly welded to the pressure vessel, the replacement is not required throughout the life, and the risk is high. In addition, the resistance coefficient of the structure itself is high.
为了克服以上存在的技术缺点， 亟需提供一种新型的反应堆下部堆内构 件。 发明内容 In order to overcome the above technical shortcomings, it is urgent to provide a new type of reactor bottom stack internal structure. Pieces. Summary of the invention
本发明要解决的技术问题是提供一种结构简单， 流量分配均匀， 阻力系 数小， 便于更换和维修的反应堆下部堆内构件。  The technical problem to be solved by the present invention is to provide a reactor lower pile internal component which is simple in structure, uniform in flow distribution, small in resistance coefficient, and easy to replace and repair.
为解决上述技术问题， 本发明一种反应堆下部堆内构件， 包括反应堆压 力容器、 置于反应堆压力容器之内的堆芯、 以及固定于堆芯底部的堆芯支承 下板； 还包括设有若干圆孔的流量分配装置， 流量分配装置包括上分配环、 与上分配环底部沿周向固定连接的中分配环， 与中分配环底部沿周向固定连 接的下分配板； 上分配环顶部设有若干外翻的凸部， 上分配环外翻的凸部与 堆芯支承下板固定连接。  In order to solve the above technical problems, the present invention includes a reactor internal pressure component, a reactor pressure vessel, a core disposed inside the reactor pressure vessel, and a core supporting lower plate fixed to the bottom of the core; The flow distribution device of the circular hole, the flow distribution device comprises an upper distribution ring, a middle distribution ring fixedly connected to the bottom of the upper distribution ring in the circumferential direction, and a lower distribution plate fixedly connected with the bottom of the middle distribution ring in the circumferential direction; There are a plurality of everted protrusions, and the convex portion of the upper distribution ring is fixedly connected with the core supporting lower plate.
上分配环的周向侧壁上设有连续分布等直径的圆孔。  A circular hole having a continuous diameter is continuously disposed on the circumferential side wall of the upper distribution ring.
中分配环的周向侧壁上设有连续分布的圆孔， 每排圆孔的数量相等， 直 径相同。  The circumferential side wall of the middle distribution ring is provided with continuously distributed circular holes, and the number of the circular holes in each row is equal and the diameter is the same.
下分配板上旋转对称的设有圆孔。  The lower distribution plate is rotationally symmetric with a circular hole.
上分配环的轴向高度小于中分配环的轴向高度。  The axial height of the upper distribution ring is less than the axial height of the middle distribution ring.
上分配环周向侧壁与水平面形成的角度大于中分配环周向侧壁与水平面 形成的角度。  The circumferential side wall of the upper distribution ring forms an angle with the horizontal plane that is greater than the angle formed by the circumferential side wall of the middle distribution ring and the horizontal plane.
下分配板的下表面设有若干能量吸收装置， 能量吸收装置下端设有防断 底板。  The lower surface of the lower distribution plate is provided with a plurality of energy absorbing devices, and the lower end of the energy absorbing device is provided with an anti-break bottom plate.
上分配环若干外翻凸部的底部位于同一水平面。  The bottoms of the upper eversions of the upper distribution ring are located on the same horizontal plane.
流量分配装置内设有若干上端与堆芯支承下板连接， 下端与下分配板连 接的支承柱。  The flow distribution device is provided with a plurality of support columns whose upper ends are connected to the core support lower plate and the lower end is connected to the lower distribution plate.
堆芯入口流量分配的均匀程度关系到堆芯热量能否及时顺利的导出， 直 接决定了堆芯热点的位置和热管因子的大小， 而热管因子直接关系到整个核 反应堆乃至整个核电厂的安全， 同时影响到核蒸汽的经济性。 本发明通过一 种包覆式的流量分配装置， 冷却剂从压力容器进口接管进入后， 通过环腔， 进入反应堆下腔室流量分配装置外， 沿着压力容器下封头圆弧面实现转向， 期间通过流量分配装置的圆孔进入流量分配装置内， 来自四周和底面的冷却 剂在流量分配装置内进行一定程度的搅混后进入堆芯， 由于有凸部和支承柱 的连接， 使整个流量分配装置具有很好的刚性， 足够抵御冷却剂的横向冲击。 The uniformity of the core inlet flow distribution is related to whether the core heat can be exported smoothly and directly, which directly determines the location of the core hot spot and the size of the heat pipe factor, and the heat pipe factor is directly related to the entire core. The safety of the reactor and even the entire nuclear power plant, while affecting the economics of nuclear steam. The invention adopts a coated flow distribution device, after the coolant enters from the inlet of the pressure vessel, passes through the annular cavity, enters the flow distribution device of the lower chamber of the reactor, and realizes the steering along the arc surface of the lower head of the pressure vessel. During the flow through the circular orifice of the flow distribution device, the coolant from the surrounding and bottom surfaces enters the core after a certain degree of mixing in the flow distribution device. The entire flow distribution is caused by the connection of the convex portion and the support column. The device is very rigid and resistant to the lateral impact of the coolant.
本发明通过流量分配装置上设置合适大小、 数量、 形状和位置的圆孔， 实现了冷却剂进入堆芯前很好的分配效果， 减少了沿程阻力损失， 满足了邻 近组件的入口流量分配偏差允许值、 最大平均流量等指标。 附图说明  The invention realizes a good distribution effect of the coolant before entering the core through the round hole with appropriate size, quantity, shape and position on the flow distribution device, reduces the resistance loss along the path, and satisfies the deviation of the inlet flow distribution of the adjacent components. Allowable values, maximum average flow, and other indicators. DRAWINGS
图 1为本发明所提供的一种反应堆下部堆内构件的结构示意图。  1 is a schematic view showing the structure of a reactor internal pile member provided by the present invention.
图 2为本发明所提供的一种反应堆下部堆内构件中的的流量分配装置的 示意图。  Figure 2 is a schematic illustration of a flow distribution device in a reactor internal stack assembly provided by the present invention.
图中： 1 为反应堆压力容器， 2为堆芯支承下板， 3为流量分配装置， 4 为支承柱， 5为能量吸收装置， 6为防断底板。 具体实施方式  In the figure: 1 is the reactor pressure vessel, 2 is the core support lower plate, 3 is the flow distribution device, 4 is the support column, 5 is the energy absorption device, and 6 is the anti-break floor. detailed description
下面结合附图和实施例对本发明作进一步详细的说明。  The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.
本发明包括反应堆压力容器 1、 堆芯和流量分配装置 3。  The invention includes a reactor pressure vessel 1, a core and a flow distribution device 3.
堆芯置于反应堆压力容器 1之内。 堆芯支承下板 2通常为一块大直径的 圆板， 板上安放有燃料组件定位销， 用作支承燃料组件。 堆芯支承下板 2上 加工有大量的通孔， 通常一组燃料组件对应 4个。 冷却剂通过这些通孔进入 堆芯， 冷却堆芯。  The core is placed inside the reactor pressure vessel 1. The core support lower plate 2 is typically a large diameter circular plate on which a fuel assembly locating pin is placed for use as a support fuel assembly. The core support lower plate 2 is machined with a large number of through holes, usually one set of four fuel assemblies. The coolant enters the core through these through holes and cools the core.
流量分配装置 3包括上分配环、 中分配环和下分配板。 上分配环的周向 侧壁上设有连续分布等直径的圆孔， 上分配环的顶部圆周直径大于低部圆周 直径。 中分配环的周向侧壁上设有连续分布的圆孔， 每排圆孔的数量相等， 直径相同， 中分配环的顶部圆周直径大于底部圆周直径。 下分配板上旋转对 称的设有圆孔， 下分配板的直径等于中分配环底部圆周直径。 上分配环的轴 向高度小于中分配环的轴向高度。 上分配环周向侧壁与水平面形成的角度大 于中分配环周向侧壁与水平面形成的角度。 上分配环， 中分配环和下分配板 采用焊接方式连接成一整体， 在靠近连接焊缝处避免加工流水孔， 以防止消 弱焊缝的强度。 在制造技术允许的情况下， 可采用整体锻造的加工方法， 此 时靠近连接处可适当增加流水孔的排数。上分配环顶部设有若干外翻的凸部， 上分配环外翻的凸部与堆芯支承下板通过螺栓或焊接的方式固定连接。 上分 配环若干外翻凸部的底部位于同一水平面， 用于下部堆内构件存放。 流量分 配装置 3 内设有若干上端与堆芯支承下板通过螺钉连接， 下端与下分配板通 过螺钉连接的支承柱 4。 The flow distribution device 3 includes an upper distribution ring, a middle distribution ring, and a lower distribution plate. The circumferential direction of the upper distribution ring The side wall is provided with a circular hole having a continuous distribution of equal diameters, and the top circumference diameter of the upper distribution ring is larger than the diameter of the lower circumference. The circumferential side wall of the middle distribution ring is provided with continuously distributed circular holes, the number of the circular holes in each row is equal, the diameter is the same, and the diameter of the top circumference of the middle distribution ring is larger than the diameter of the bottom circumference. The lower distribution plate is rotationally symmetric with a circular hole, and the diameter of the lower distribution plate is equal to the diameter of the bottom circumference of the middle distribution ring. The axial height of the upper distribution ring is less than the axial height of the middle distribution ring. The circumferential side wall of the upper distribution ring forms an angle with the horizontal plane that is greater than the angle formed by the circumferential side wall of the middle distribution ring and the horizontal plane. The upper distribution ring, the middle distribution ring and the lower distribution plate are welded together to form a whole, and the processing water hole is avoided near the joint weld to prevent the strength of the weld from being weakened. In the case where manufacturing technology permits, an integral forging process can be employed, in which case the number of rows of the water holes can be appropriately increased near the joint. The top of the upper distribution ring is provided with a plurality of everted convex portions, and the convex portion of the upper distribution ring is fixedly connected with the core supporting lower plate by bolts or welding. The bottoms of the plurality of everted protrusions of the upper distribution ring are located at the same level for storage of the lower stack internal components. The flow distribution device 3 is provided with a plurality of support columns 4 whose upper ends are connected to the core supporting lower plate by screws, and the lower end and the lower distribution plate are connected by screws.
下分配板的下表面通过螺钉均匀固定有四个能量吸收装置 5， 能量吸收 装置 5下端通过螺钉固定有防断底板 6。 能量吸收装置 4是由套筒、 缓冲器 和导柱组成。 防断底板 5与反应堆压力容器内壁有一定的间隙。 当发生堆芯 跌落事故时， 防断底板 5与反应堆压力容器接触， 能量吸收装置 4产生塑性 变形， 吸收部分来自堆芯跌落的能量， 以较少对反应堆压力容器的冲击。  The lower surface of the lower distribution plate is uniformly fixed with four energy absorbing devices 5 by screws, and the lower end of the energy absorbing device 5 is fixed with a break preventing bottom plate 6 by screws. The energy absorbing device 4 is composed of a sleeve, a damper and a guide post. The anti-break floor 5 has a certain gap with the inner wall of the reactor pressure vessel. When a core drop accident occurs, the anti-break floor 5 is in contact with the reactor pressure vessel, and the energy absorbing device 4 is plastically deformed, absorbing some of the energy falling from the core to less impact on the reactor pressure vessel.
冷却剂通过反应堆压力容器 1上两到四个的圆形进口接管进入反应堆， 向下经过环形通道进入反应堆的下部腔室， 进入反应堆下腔室流量分配装置 外， 沿着反应堆压力容器 1下封头圆弧面实现转向， 期间通过流量分配装置 3的圆孔进入流量分配装置 3内，来自四周和底面的冷却剂在流量分配装置 3 内进行一定程度的搅混后进入堆芯， 由于有凸部和支承柱 4的连接， 使整个 流量分配装置具有很好的刚性， 足够抵御冷却剂的横向冲击。 流量分配装置 3 上设置合适大小、 数量、 形状和位置的圆孔， 实现了冷却剂进入堆芯前很 好的分配效果， 减少了沿程阻力损失， 满足了邻近组件的入口流量分配偏; 允许值、 最大平均流量等指标。 The coolant enters the reactor through two to four circular inlets on the reactor pressure vessel 1, passes down the annular passage into the lower chamber of the reactor, enters the reactor lower chamber flow distribution device, and is sealed along the reactor pressure vessel 1. The head circular arc surface realizes steering, and enters the flow distribution device 3 through the circular hole of the flow distribution device 3, and the coolant from the surrounding and bottom surfaces enters the core after a certain degree of mixing in the flow distribution device 3, due to the convex portion The connection to the support column 4 provides the entire flow distribution device with a good rigidity sufficient to withstand the lateral impact of the coolant. A circular hole of appropriate size, number, shape and position is set on the flow distribution device 3, so that the coolant enters the core very well. The good distribution effect reduces the resistance loss along the path, and satisfies the inlet flow distribution bias of the adjacent components; the allowable value, the maximum average flow rate and other indicators.

Claims

权 利 要 求 书 Claim
1. 一种反应堆下部堆内构件， 包括反应堆压力容器、 置于所述反应堆压 力容器之内的堆芯、 以及固定于所述堆芯底部的堆芯支承下板； 其特征在于: 还包括设有若干圆孔的流量分配装置， 所述流量分配装置包括上分配环、 与 上分配环底部沿周向固定连接的中分配环， 与中分配环底部沿周向固定连接 的下分配板； 所述上分配环顶部设有若干外翻的凸部， 所述上分配环外翻的 凸部与所述堆芯支承下板固定连接。  A reactor internals of a reactor, comprising a reactor pressure vessel, a core disposed within the reactor pressure vessel, and a core supporting lower plate fixed to the bottom of the core; characterized by: a flow distribution device having a plurality of circular holes, the flow distribution device comprising an upper distribution ring, a middle distribution ring fixedly connected to the bottom of the upper distribution ring in a circumferential direction, and a lower distribution plate fixedly connected to the bottom of the middle distribution ring in a circumferential direction; The top of the distribution ring is provided with a plurality of everted convex portions, and the convex portion of the upper distribution ring is fixedly connected to the core supporting lower plate.
2. 根据权利要求 1所述的一种反应堆下部堆内构件， 其特征在于： 所述 上分配环的周向侧壁上设有连续分布等直径的圆孔。  2. A reactor lower stack internal component according to claim 1, wherein: the circumferential side wall of the upper distribution ring is provided with circular holes of continuous distribution of equal diameters.
3. 根据权利要求 1所述的一种反应堆下部堆内构件， 其特征在于： 所述 中分配环的周向侧壁上设有连续分布的圆孔， 每排圆孔的数量相等， 直径相 同。  3. The reactor lower stack internal component according to claim 1, wherein: the circumferential side wall of the middle distribution ring is provided with continuously distributed circular holes, each of which has the same number of circular holes and the same diameter. .
4. 根据权利要求 1所述的一种反应堆下部堆内构件， 其特征在于： 所述 下分配板上旋转对称的设有圆孔。  4. The reactor lower stack internal component according to claim 1, wherein: the lower distribution plate is provided with a circular hole in a rotationally symmetric manner.
5. 根据权利要求 1所述的一种反应堆下部堆内构件， 其特征在于： 所述 上分配环的轴向高度小于中分配环的轴向高度。  5. A reactor lower stack internal component according to claim 1 wherein: said upper distribution ring has an axial height that is less than an axial height of the intermediate distribution ring.
6. 根据权利要求 1所述的一种反应堆下部堆内构件， 其特征在于： 所述 上分配环周向侧壁与水平面形成的角度大于所述中分配环周向侧壁与水平面 形成的角度。  6. The reactor lower stack internal component according to claim 1, wherein: an angle formed by the circumferential side wall of the upper distribution ring and a horizontal plane is greater than an angle formed by a circumferential side wall of the middle distribution ring and a horizontal plane. .
7. 根据权利要求 1所述的一种反应堆下部堆内构件， 其特征在于： 所述 下分配板的下表面设有若干能量吸收装置， 所述能量吸收装置下端设有防断 底板。  7. The reactor lower stack internal component according to claim 1, wherein: the lower surface of the lower distribution plate is provided with a plurality of energy absorbing devices, and the lower end of the energy absorbing device is provided with a breakage preventing bottom plate.
8. 根据权利要求 1所述的一种反应堆下部堆内构件， 其特征在于： 所述 上分配环若干外翻凸部的底部位于同一水平面。 8. A reactor lower stack internal component according to claim 1 wherein: The bottoms of the upper eversions of the upper distribution ring are located on the same horizontal plane.
9. 根据权利要求 1所述的一种反应堆下部堆内构件， 其特征在于： 所述 流量分配装置内设有若干上端与所述堆芯支承下板连接， 下端与下分配板连 接的支承柱。  9. The reactor lower stack internal component according to claim 1, wherein: the flow distribution device is provided with a plurality of upper ends connected to the core supporting lower plate, and the lower end is connected to the lower distribution plate. .
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