-
51.发明授权Reactor core for a light water cooled reactor, fuel assembly and control rod 失效反应堆核心为轻水冷却反应堆，燃料组件和控制棒
公开(公告)号：US5812621A
公开(公告)日：1998-09-22
申请号：US498757
申请日：1995-07-06
申请人： Renzo Takeda , Motoo Aoyama , Masanao Moriwaki
发明人： Renzo Takeda , Motoo Aoyama , Masanao Moriwaki
IPC分类号： G21C5/20 , G21C1/00 , G21C1/08 , G21C3/00 , G21C3/328 , G21C3/62 , G21C7/10 , G21C7/113 , G21C7/117 , G21G1/06 , G21C1/04 , G21C3/30
CPC分类号： G21C1/084 , G21C1/00 , G21C3/00 , G21C7/113 , G21Y2002/201 , G21Y2002/601 , G21Y2004/101 , G21Y2004/30 , G21Y2004/60 , Y02E30/31 , Y02E30/39
摘要： A reactor core for a boiling water reactor, a fuel assembly and a control rod intended for Pu multi-recycling at a breeding ratio of about 1.0, or 1.0 or more while keeping the economical or safety performance to the same level as in a boiling water reactor now under operation. The reactor has an effective water-to-fuel volume ratio of 0.1 to 0.6 by the combination of a dense lattice fuel assembly constituted of fuel rods formed by adding Pu to degraded uranium, natural uranium, depleted uranium or low concentrated uranium, and having coolants at a high void fraction of 45% to 70% and a cluster-type, Y-type or cruciform control rod.
摘要翻译： 用于沸水反应器的反应堆芯，燃料组件和控制棒，其用于以约1.0或1.0或更多的育种比率进行Pu多重循环，同时将经济或安全性能保持在与沸水中相同的水平 反应堆正在运行。 该反应器通过组合由通过将Pu添加到退化的铀，天然铀，贫化铀或低浓铀形成的燃料棒的致密格子燃料组合而具有0.1至0.6的有效的水与燃料体积比，并具有冷却剂 45％至70％的高空隙率和簇型Y型或十字形控制棒。
-
公开(公告)号：US5383229A
公开(公告)日：1995-01-17
申请号：US879
申请日：1993-01-05
申请人： Akinobu Nakajima , Yoko Ishibashi , Motoo Aoyama , Kunitoshi Kurihara , Junichi Yamashita , Junjiro Nakajima , Koji Nishida
发明人： Akinobu Nakajima , Yoko Ishibashi , Motoo Aoyama , Kunitoshi Kurihara , Junichi Yamashita , Junjiro Nakajima , Koji Nishida
CPC分类号： G21C3/328 , G21Y2002/201 , G21Y2004/30 , Y02E30/38
摘要： A second fuel rod positioned at each corner of a channel box and second fuel rods adjacent to the former are formed to have a smaller outer diameter than that of ordinary first fuel rods, so that a pitch between the second fuel rods is narrower than a pitch between the first fuel rods. Making the outer diameter of the second fuel rods smaller than that of the first fuel rods reduces the power per unit length of the second fuel rods. The narrower pitch between the second fuel rods than the pitch between the first fuel rods provides two effects. First, a unit lattice cell becomes so small as to avoid an increase in the H/U ratio. Secondly, a new moderator region is formed between the second fuel rods and the first fuel rods adjacent thereto, the moderator region acting to intensify thermal neutron flux around those first fuel rods. These two effects enable a further reduction in the power per unit length of the second fuel rods. As a result, a fuel assembly intended for higher burn-up can be realized by increasing enrichment, while suppressing an increase in the local power peaking factor at corners of the fuel assembly.
摘要翻译： 定位在通道箱的每个角落处的第二燃料棒和与前者相邻的第二燃料棒形成为具有比普通的第一燃料棒小的外径，使得第二燃料棒之间的间距比间距窄 在第一燃料棒之间。 使得第二燃料棒的外径小于第一燃料棒的外径减小了第二燃料棒的每单位长度的功率。 第二燃料棒之间的间距窄于第一燃料棒之间的间距，提供了两个效果。 首先，单位晶胞变得如此小以避免H / U比的增加。 其次，在第二燃料棒和与其相邻的第一燃料棒之间形成新的慢化剂区域，该慢化剂区域用于加强围绕这些第一燃料棒的热中子通量。 这两个效果使得能够进一步降低第二燃料棒的每单位长度的功率。 结果，可以通过增加浓缩来实现用于更高燃耗的燃料组件，同时抑制燃料组件的角落处的局部功率峰值因数的增加。
-
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。
-
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。
-
公开(公告)号：US5307387A
公开(公告)日：1994-04-26
申请号：US918596
申请日：1992-07-24
CPC分类号： G21C5/02 , G21C19/205 , G21Y2002/201 , G21Y2004/40 , Y02E30/40
摘要： In a fuel loading method for a reactor core made up by high burn-up fuel, fuel assemblies loaded in a circumferential zone of the core are shuffled between two layers of the circumferential zone until residing in the core for two cycles and, after residing for two cycles, are moved to the fourth layer of the circumferential zone from an outermost layer of the core, thereby reducing the difference in exposure due to a different radial power level in the vicinity of the core boundary. Those fuel assemblies are moved to control cells in a central zone of the core after residing in the circumferential zone for three cycles, and also such fuel assemblies as having resided in the central zone for three cycles are moved to the core outermost layer, thereby reducing the difference in exposure between the fuel assemblies having resided in the central zone and the fuel assemblies having resided in the circumferential zone due to different power levels in the central and circumferential zones. As a result, the difference in exposure between used fuel assemblies is reduced.
摘要翻译： 在由高燃耗燃料构成的反应堆堆芯的燃料装载方法中，装载在芯的圆周区域的燃料组件在周向区域的两层之间被洗牌，直到驻留在铁芯中两个循环，并且在驻留 两个周期从芯的最外层移动到周向区的第四层，从而减小由于在核心边界附近的不同径向功率水平引起的曝光差异。 这些燃料组件在驻留在周向区域中三个循环之后移动到核心的中心区域中的控制室，并且也将驻留在中心区域中的三个循环的这种燃料组件移动到芯最外层，从而减少 由于在中心区域和周边区域中的功率水平不同，已经驻留在中心区域中的燃料组件和位于周向区域中的燃料组件之间的曝光差异。 结果，使用的燃料组件之间的曝光差减小。
-
56.发明授权
公开(公告)号：US4914678A
公开(公告)日：1990-04-03
申请号：US230171
申请日：1988-08-09
申请人： Junichi Koyama , Motoo Aoyama
发明人： Junichi Koyama , Motoo Aoyama
摘要： The reactor core is divided into a central region and a surrounding outer region in the radial direction. First fresh fuel unirradiated assemblies newly loaded onto the outer region contain a fissible material in amounts less than that of the fissible material of second fresh unirradiated fuel assemblies newly loaded onto the central region. If the amount of the fissible material in the upper region of the first fuel assembly is denoted by a, the amount of the fissible material in the lower region of the first fuel assembly by b, the amount of the fissible material in the upper region of the second fuel assembly by c, and the amount of the fissible material in the lower region of the second fuel assembly by d, then a relationship a/b
摘要翻译： 反应堆芯在径向上被分成中心区域和周围的外部区域。 新加载到外部区域的新鲜燃料未照射组件含有少于新装载到中央区域的第二新鲜未照射燃料组件的容许材料的容许材料。 如果在第一燃料组件的上部区域中的容许材料的量由a表示，则第一燃料组件的下部区域中的容许材料的量由b表示，上部区域中的容许材料的量 第二燃料组件通过c和第二燃料组件的下部区域中的可容许材料的数量乘以d，则满足关系a / b
-
公开(公告)号：US4871510A
公开(公告)日：1989-10-03
申请号：US178902
申请日：1988-04-07
申请人： Motoo Aoyama , Renzo Takeda
发明人： Motoo Aoyama , Renzo Takeda
摘要： A fuel assembly of the present invention comprises fuel rods which are arranged in 9 rows and 9 columns (9.times.9) in a channel box. The channel box has a width L between outer walls thereof and a width D between inner walls thereof, both of which satisfy the following equation:0.12.ltoreq.(P-L)/Dwherein P denotes the fuel assembly pitch in a reactor core. A sufficient cold shutdown margin for a reactor core can be secured by determining the widths L and D so as to satisfy the above-described equation, even if the average enrichment of the fuel assembly is increased to 4 wt % or more.
摘要翻译： 本发明的燃料组件包括在通道箱中布置成9列和9列（9x9）的燃料棒。 通道箱在其外壁之间具有宽度L和其内壁之间的宽度D，两者都满足以下等式：0.12 <=（P-L）/ D其中P表示反应堆芯中的燃料组件间距。 即使燃料组件的平均富集度提高到4重量％以上，也可以通过确定宽度L和D以满足上述等式来确保反应堆堆芯的足够的冷关闭裕度。
-
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。
-
-
-
-
-
-
-
搜索结果
58 条记录 (耗时 0.029 秒)
