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公开(公告)号：US5377247A
公开(公告)日：1994-12-27
申请号：US42443
申请日：1993-02-19
申请人： Ritsuo Yoshioka , Takeshi Seino , Toru Yamamoto , Yasushi Hirano
发明人： Ritsuo Yoshioka , Takeshi Seino , Toru Yamamoto , Yasushi Hirano
摘要： A nuclear reactor core is provided with a fuel assembly which comprises channel boxes respectively separated with spaces into which control rods are arranged and a plurality of fuel rods arranged in the channel box, at least a part of the fuel rods being charged with uranium-plutonium mixture fuel and an enrichment of U-235 or a concentration of plutonium, or both being distributed in an axial direction of the fuel rods. The concentration of a burnable poison packed in the fuel rod is distributed in the axial direction of the fuel assembly. The ratio of the occupying region of a moderator of the fuel assembly is increased with respect to the fuel occupying region. The number of the fuel rods containing the burnable poison is variously changed with respect to the total number of the fuel rods and the arranging mode thereof is also varied with the concentration thereof.
摘要翻译： 核反应堆堆芯设置有燃料组件，燃料组件包括分别与设置有控制棒的空间分开的通道箱和布置在通道箱中的多个燃料棒，至少一部分燃料棒装有铀 - 钚 混合燃料和U-235的浓缩或浓度的钚，或两者分布在燃料棒的轴向方向上。 装在燃料棒中的可燃毒物的浓度分布在燃料组件的轴向上。 燃料组件的调节剂的占据区域的比例相对于燃料占据区域增加。 含有可燃毒物的燃料棒的数量相对于燃料棒的总数而有各种变化，其排列方式也随其浓度而变化。
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公开(公告)号：US5349619A
公开(公告)日：1994-09-20
申请号：US64638
申请日：1993-05-21
申请人： Takaaki Mochida , Motoo Aoyama
发明人： Takaaki Mochida , Motoo Aoyama
CPC分类号： G21C3/328 , G21C3/322 , G21C2003/3225 , G21Y2002/201 , G21Y2004/30 , Y02E30/38
摘要： A fuel assembly for a light water reactor comprising a plurality of fuel rods which contain plutonium as a primary fissile material when exposure is zero, and a light water reactor including such fuel assemblies. The fuel assembly has a structure in which at least one of moderator rods is provided at least in one of each corner portion of an arrangement of the fuel rods and a position adjacent to the corner portion in such a manner that the moderator rods are located in rotation symmetry, each of the moderator rods being filled with water or a solid coolant over a length at least corresponding to a fuel effective length, and the fuel rods are provided at positions in the second layer from the outermost periphery which are adjacent to those positions at which the moderator rods are located.
摘要翻译： 一种用于轻水反应器的燃料组件，包括当暴露为零时包含钚作为主要裂变材料的多个燃料棒，以及包括这种燃料组件的轻水反应堆。 燃料组件具有这样的结构，其中至少一个减速杆设置在燃料棒的布置的每个角部的至少一个中，并且以与角部相邻的位置设置，使得调节杆位于 旋转对称，每个减速杆在至少对应于燃料有效长度的长度上填充有水或固体冷却剂，并且燃料棒设置在第二层中与最靠近这些位置的最外周的位置 调音杆位于该位置。
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公开(公告)号：US5337337A
公开(公告)日：1994-08-09
申请号：US857263
申请日：1992-03-25
CPC分类号： G21C3/328 , G21Y2002/201 , G21Y2004/30 , Y02E30/38
摘要： A fuel assembly comprising a plurality of fuel rods, where fuel rods containing a burnable poison element having a smaller neutron absorption cross-section such as boron are provided in a region of soft neutron energy spectrum and a large thermal neutron flux and fuel rods containing a burnable poison element having a larger neutron absorption cross-section such as gadolinium and fuel rods containing no such burnable poison element are provided in other region of average neutron energy spectrum, has a flat fuel rod power distribution throughout the fuel lifetime even against substantially uniform uranium enrichment distribution with reduced parasitic neutron absorption by gadolia, that is, with higher burnup and reduced fuel cycle cost.
摘要翻译： 一种燃料组件，其包括多个燃料棒，其中在软中子能谱范围内设置含有具有较小中子吸收截面的可燃毒元素的燃料棒，例如硼，并且包含大量热中子通量和含有 在其他平均中子能谱区域中提供了具有较大中子吸收截面的可燃毒物元素，例如钆和不含这种可燃毒物元素的燃料棒，在整个燃料使用寿命期间具有扁平的燃料棒功率分布，甚至基本上均匀的铀 浓缩分布减少钆的寄生中子吸收，即燃耗增加和燃料循环成本降低。
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公开(公告)号：US5299244A
公开(公告)日：1994-03-29
申请号：US772440
申请日：1991-10-07
申请人： Koki Yamauchi , Yasunori Bessho , Sadayuki Izutsu
发明人： Koki Yamauchi , Yasunori Bessho , Sadayuki Izutsu
CPC分类号： G21C3/328 , G21Y2002/201 , G21Y2004/302 , Y02E30/38
摘要： A plurality of fuel rods containing fissile material are arranged in triangle lattices. A plurality of water rods groups are arranged among the fuel rods. Each of the water rods groups includes no fuel rod but a plurality of water rods which are arranged adjacently each other in triangle lattices having substantially same pitch as the fuel rods. The water rods groups are arranged not adjacently each other, and are surrounded with the fuel rods. the outer diameter of the water rod is smaller than the pitch. The fuel assembly is able to suppress increment of pressure loss because of formation of coolant path among adjacent water rods. Further, void reactivity coefficient is able to be small.
摘要翻译： 包含易裂变材料的多个燃料棒被布置成三角形格子。 燃料棒之间布置有多个水杆组。 每个水棒组不包括燃料棒，而是包括与燃料棒具有基本相同节距的三角形格架相邻布置的多个水杆。 水杆组彼此相邻配置，并被燃料棒包围。 水杆的外径小于间距。 燃料组件由于在相邻的水棒之间形成冷却剂路径而能够抑制压力损失的增加。 此外，空隙反应性系数能够小。
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公开(公告)号：US5149495A
公开(公告)日：1992-09-22
申请号：US527901
申请日：1990-05-24
申请人： Robert B. Elkins
发明人： Robert B. Elkins
CPC分类号： G21C3/322 , G21C3/328 , G21C3/33 , G21C2003/3225 , G21Y2002/201 , G21Y2004/30 , Y02E30/31 , Y02E30/38
摘要： Water rod configurations, such as for a boiling water nuclear reactor, are provided. An efficiency parameter is defined which relate to how well-used the sacrificed fuel rod positions are. Four particular water rod configurations are described, which produce high efficiency, such as having a water rod efficiency greater than about 0.6, preferably greater than about 0.7. Desired moderation is achieved by providing for sacrifice of more than four and less than nine lattice positions. The first "peanut" configuration has a cross-section with two round-cornered triangular regions, integrally connected by a constricted portion. The second configuration has a substantially rectangular cross-section. The third "clover" configuration has a four-lobed shape. The fourth "figure 8" configuration has two substantially circular cross-sectional portions. A method for analysis and design, using a new efficiency parameter, is provided. An apparatus and method for maintaining the water rod and associated fuel rods in the desired spaced configuration is effected by devices for engagement. The engagement devices use resilient deflection to produce engagement of the water rods with spacer apparatus.
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公开(公告)号：US5094805A
公开(公告)日：1992-03-10
申请号：US486519
申请日：1990-02-28
IPC分类号： G21C3/328
CPC分类号： G21C3/328 , G21Y2002/201 , G21Y2004/30 , Y02E30/32 , Y02E30/38
摘要： A fuel assembly for a pressurized water reactor includes fuel assembly edges and a fuel assembly interior. A bundle of mutually parallel fuel rods with cladding tubes each contain nuclear fuel. A given number of guide tubes are provided for control rods. A support structure includes an upper end with a fuel assembly head, a lower end with a fuel assembly foot, and a plurality of spacers disposed perpendicular to the fuel rods. The spacers have a uniform grid structure with edge meshes formed therein at the fuel assembly edges and inner meshes formed therein in the fuel assembly interior. Each of the inner meshes are surrounded by four respective immediately adjacent meshes each having the same area and each containing a respective one of the guide or cladding tubes or an instrumentation tube. At least one of the four meshes immediately adjacent each given inner mesh with a guide tube, contains a fuel rod cladding tube with a periphery being closer to the guide tube than the fuel rod cladding tubes in the remainder of the four meshes. The cladding tube of the fuel rod in the at least one mesh immediately adjacent the given inner mesh with a guide tube, may have a larger outside diameter than a fuel rod in an edge mesh and/or it may have a central axis being closer to the guide tube than the center of the at least one mesh.
摘要翻译： 用于压水反应堆的燃料组件包括燃料组件边缘和燃料组件内部。 一束具有包层管的相互平行的燃料棒各自含有核燃料。 为控制棒提供给定数量的导管。 支撑结构包括具有燃料组件头的上端，具有燃料组件脚的下端和垂直于燃料棒设置的多个间隔件。 间隔件具有均匀的格栅结构，其中在燃料组件边缘处形成有边缘网格，并在燃料组件内部形成内网。 每个内网被四个相邻的相邻的网格包围，每个网格具有相同的面积，并且每个都包含导向或包层管或仪器管中的相应的一个。 紧邻每个给定内网的四个网格中的至少一个具有引导管，包含燃料棒包覆管，其四周的剩余部分中的周边比燃料棒包层管更靠近引导管。 在紧邻给定内网的至少一个网眼中的燃料棒的包壳管与引导管可以具有比边缘网格中的燃料棒更大的外径和/或其可具有更接近 导管比至少一个网格的中心。
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公开(公告)号：US4921282A
公开(公告)日：1990-05-01
申请号：US356625
申请日：1989-05-19
申请人： Stanlee W. Meisinger
发明人： Stanlee W. Meisinger
CPC分类号： G21C7/27 , G21C3/328 , G21Y2002/201 , G21Y2004/30 , Y02E30/38 , Y02E30/39 , Y10S285/918 , Y10S285/924
摘要： A coupling for use with an insert. The coupling including a latching sleeve unbalanced under pressure and a release sleeve for venting pressure.
摘要翻译： 用于插入件的联轴器。 联轴器包括在压力下不平衡的锁紧套筒和用于排气压力的释放套筒。
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98.发明授权
公开(公告)号：US4708845A
公开(公告)日：1987-11-24
申请号：US852853
申请日：1986-04-16
CPC分类号： G21C3/3563 , G21C3/328 , Y02E30/31 , Y02E30/38
摘要： A fuel assembly has a bundle of elongated fuel rods disposed in a side-by-side relationship so as to form an array of spaced fuel rods, an outer tubular flow channel surrounding the fuel rods so as to direct flow of coolant/moderator fluid along the fuel rods, a hollow water cross extending centrally through and interconnected with the outer flow channel so as to divide the channel into separate compartments and the bundle of fuel rods into a plurality of mini-bundles thereof being disposed in the respective compartments, and a plurality of spacers axially displaced along the fuel rods in each of the mini-bundles thereof. Each of the fuel rods includes an outer cladding tube with an inner clad surface and a plurality of fuel pellets contained within the tube. Each spacer is composed of a plurality of interleaved inner straps and an outer strap encompassing the inner straps. The interleaved inner straps and the outer strap have respective protrusions formed thereon and together define spacer cells into which the respective protrusions extend to maintain the fuel rods received through the spacer cells in laterally spaced relationships in respective corner, side and interior cells defined by the interleaved inner straps and the outer straps. The BWR fuel assembly includes several improvements which enhance its thermal-hydraulic performance. First, each of the fuel rods received through the corner cells of each spacer has a diametric size smaller than that of the fuel rods received through the side and interior cells of each spacer. Also, each of the protrusions in the corner cells extend a greater distance into the corner cells than the distance through which the protrusions in the side and interior cells extend into those cells, whereby increased coolant flow space is provided through the corner cells as compared to the side and interior cells so as to increase heat transfer from the corner fuel rods to the coolant. Second, perforations are formed in the outer strap at the locations of the corner and side cells of the spacer for reducing the amount of strap area adjacent the fuel rods received in the corner and side cells and thereby increasing coolant flow to the corner and side fuel rods. Third, a generally uniform poison coating, such as boron, is applied within at least a majority of the fuel rods, the poison coating being applied to either the fuel pellets or the inner clad surface of the cladding tube of each fuel rod in the majority. Additionally, a predetermined pattern of fuel enrichment is provided with respect to the fuel rods of each mini-bundle thereof which together with the uniform poison coatings within the fuel rods ensures that the peaking powers of fuel rods in the corner and side cells of the spacers are less than the peaking power of a leading one of the fuel rods in the interior cells of the spacers.
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公开(公告)号：US4689195A
公开(公告)日：1987-08-25
申请号：US635927
申请日：1984-07-30
申请人： Motoo Aoyama , Kunitoshi Kurihara
发明人： Motoo Aoyama , Kunitoshi Kurihara
CPC分类号： G21C3/328 , G21C7/00 , G21C3/32 , G21Y2002/201 , G21Y2004/10 , G21Y2004/30 , G21Y2004/40 , Y02E30/38 , Y02E30/39
摘要： In a nuclear reactor, gaps are defined between fuel assemblies so that moderators can be inserted. Hence, the nuclear characteristics vary between the central portion and periphery of the fuel assembly so that the local output peaking becomes greater on the periphery of the fuel assembly. The present invention flattens the local output peaking by providing that the quantity of a nuclear fuel material per fuel rod loaded in the fuel rods on the periphery of the fuel assembly is smaller than the quantity of the fuel material per fuel rod loaded in the fuel rods at the central portion of the fuel assembly. Any one of the following three constructions can be used:(1) The theoretical density of the nuclear fuel material pellets to be inserted into the fuel rod is reduced.(2) The nuclear fuel material pellets to be inserted into the fuel rod is made hollow.(3) The diameter of the fuel rod is reduced.
摘要翻译： 在核反应堆中，在燃料组件之间限定了间隙，从而可以插入调节器。 因此，核特性在燃料组件的中心部分和周边之间变化，使得局部输出峰值在燃料组件的周边上变得更大。 本发明通过设置装载在燃料组件周边上的燃料棒中的每个燃料棒的核燃料材料的数量小于装载在燃料棒中的每个燃料棒的燃料材料的数量来使局部输出峰值平坦化 在燃料组件的中心部分。 可以使用以下三种结构中的任何一种：（1）减少插入到燃料棒中的核燃料材料颗粒的理论密度。 （2）插入燃料棒的核燃料材料粒料为中空状。 （3）燃料棒的直径减小。
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公开(公告)号：US4654193A
公开(公告)日：1987-03-31
申请号：US603824
申请日：1984-04-25
申请人： Ken Amano , Kotaro Inoue
发明人： Ken Amano , Kotaro Inoue
摘要： This invention relates to a fuel assembly for fast reactors and aims to reduce stresses induced in fuel pins by interaction between a wrapper tube and a bundle of fuel elements each of which consists of the fuel pin and a wire spacer wound around the fuel pin. The fuel elements consists of two kinds of fuel elements, one of them consists of conventional fuel pins and wire spacers and the other fuel pins of smaller diameter than the conventional fuel pins and wire spacers of larger diameter than the conventional wire spacers whereby the fuel assembly is provided with larger space therein.
摘要翻译： 本发明涉及一种用于快堆的燃料组件，其目的是通过包裹管和一束燃料元件之间的相互作用来减少燃料销引起的应力，每个燃料元件由燃料销和缠绕在燃料销的线间隔件构成。 燃料元件由两种燃料元件组成，其中之一由传统的燃料销和电线隔离件组成，另一个燃料销包括比常规电线间隔件更大直径的常规燃料销和电线隔板的直径小的燃料销，由此燃料组件 在其中具有较大的空间。
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