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公开(公告)号：US20230386687A1
公开(公告)日：2023-11-30
申请号：US18139519
申请日：2023-04-26
申请人： Hitachi, Ltd.
IPC分类号： G21C3/10
CPC分类号： G21C3/10
摘要： A fuel assembly according to the present invention includes an end plug disposed on both upper and lower end portions of a fuel rod, and a tie plate that supports at least an upper portion of the end plug. The end plug includes a plurality of support protrusions on a surface of the end plug, and a closed-loop spring having a portion that is inserted through an opening portion formed in the end plug and is stored in a single space formed in the end plug, and a remaining portion protruding to the outside of the end plug. The end plug is supported by the plurality of support protrusions and the closed-loop spring in a state in which the plurality of support protrusions and the closed-loop spring are in contact with an inner wall of an insertion hole formed in the tie plate.
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公开(公告)号：US20160260506A1
公开(公告)日：2016-09-08
申请号：US15029140
申请日：2013-10-21
申请人： HITACHI, LTD.
发明人： Takeshi MITSUYASU , Motoo AOYAMA
摘要： The initial-core economical efficiency is improved by loading the medium enriched fuel in the peripheral or lacing it adjacent to the low enriched fuel and the highly enriched fuel. According to the present invention, in an initial core of a Boiling Water Reactor loaded with at least three types of fuel including highly enriched fuel with a fission-material content of 3.0 wt % or more, medium enriched fuel with a fission-material content of a range from 1.5 wt % or more to less than 3.0 wt %, and low enriched fuel with a fission-material content of less than 1.5 wt %, when a region of an outermost peripheral of a core occupied by the fuel having no face adjoining another fuel in a horizontal direction is defined as an outermost peripheral region, a region outside a line at 80% of a radius of a circumcircle of the core and except for the outermost peripheral region is defined as a peripheral region and the remainder is defined as an inner region, 50% or more of the fuel loaded in the peripheral region is the medium enriched fuel.
摘要翻译： 通过将富含介质的燃料装载在周边或将其附加到低浓度燃料和高浓缩燃料上来提高初始核心经济效率。 根据本发明，在装有至少三种类型燃料的沸水反应堆的初始核心中，包括裂变材料含量为3.0wt％或更高的富含高浓度燃料，具有裂变材料含量的富集燃料 在1.5重量％以上且小于3.0重量％的范围内，当燃料所占据的核的最外周的区域没有面临相邻时，裂解材料含量小于1.5重量％的低浓度燃料 将水平方向上的另一种燃料定义为最外周区域，将芯的外接圆的半径的80％的直线以外的区域除外最外周区域作为周边区域，将余数定义为 内部区域，装载在周边区域中的燃料的50％以上是富集燃料的燃料。
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公开(公告)号：US20190051421A1
公开(公告)日：2019-02-14
申请号：US16078937
申请日：2016-02-23
申请人： Hitachi, Ltd.
发明人： Takeshi MITSUYASU , Motoo AOYAMA
摘要： A fuel assembly capable of linearizing change of an infinite multiplication factor of a fuel and flattening excess reactivity while increasing average fissile plutonium enrichment of a MOX fuel, and a reactor loaded with the fuel assembly can be provided. A fuel assembly includes first fuel rods containing Pu and not containing burnable poison, a second fuel rod containing uranium and burnable poison and not containing Pu, a water rod, and a channel box accommodating the first and second fuel rods and the water rod in a bundle. The second fuel rod is disposed on an outermost periphery and/or adjacent to the water rod, of a fuel rod array in a horizontal section, N2
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公开(公告)号：US20180122522A1
公开(公告)日：2018-05-03
申请号：US15786877
申请日：2017-10-18
申请人： Hitachi, Ltd.
发明人： Michitaka ONO , Motoo AOYAMA , Takeshi MITSUYASU
CPC分类号： G21C19/205 , G21C3/30 , G21C5/18 , Y02E30/40
摘要： There is provided a core of a boiling water reactor that can be operated without loading a new fuel assembly at an operation cycle before decommissioning. In the core of the boiling water reactor in which multiple fuel assemblies are loaded in a square lattice shape, during the fuel exchange, dispositions of the multiple fuel assemblies loaded into the core are changed without loading a new fuel assembly in the core, based on the number of residence cycles, in the core, of fuel assemblies laterally adjacent and longitudinally adjacent to a fuel assembly having the shortest loading period in core cross section and the number of residence cycles, in the core, of fuel assemblies diagonally adjacent thereto, among fuel assemblies loaded into the core after the fuel exchange without loading a fuel assembly having a shorter loading period than a fuel assembly having the shortest loading period loaded into the core before the fuel exchange in the core after the fuel exchange.
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公开(公告)号：US20140185735A1
公开(公告)日：2014-07-03
申请号：US14132358
申请日：2013-12-18
申请人： Hitachi, Ltd.
IPC分类号： G21C3/32
摘要： In a fuel assembly, a plurality of fuel rods are arranged in an array of 10 rows and 10 columns in the cross section of the fuel assembly. A flow resistance member is disposed in a central portion in the cross section at upper end portions of partial length fuel rods which are a part of the fuel rods. In the flow resistance member, resistance members are each disposed between ferrules arranged in an array of 6 rows and 6 columns in the diagonal direction of the flow resistance member. Resistance members are each disposed between the ferrules in a peripheral portion of the flow resistance member. By disposing the resistance members, the pressure loss in an inner region in the cross section of the fuel assembly is increased, and the flow rate of a gas-liquid two-phase flow in an outer region surrounding the inner region is increased.
摘要翻译： 在燃料组件中，多个燃料棒在燃料组件的横截面上以10行10列排列。 在作为燃料棒的一部分的部分长度的燃料棒的上端部的横截面的中央部设置有流阻部件。 在流阻部件中，电阻部件分别配置在流阻部件的对角方向上排列成6列，6列的列的套圈之间。 电阻构件分别设置在流阻部件的周边部分中的套圈之间。 通过设置阻力构件，燃料组件的横截面内部区域的压力损失增加，并且在内部区域周围的外部区域中气液两相流的流量增加。
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