Fuel assembly for nuclear reactor
    2.
    发明授权
    Fuel assembly for nuclear reactor 失效
    核反应堆燃料组件

    公开(公告)号:US5068082A

    公开(公告)日:1991-11-26

    申请号:US219346

    申请日:1988-07-15

    摘要: A fuel assembly for a nuclear reactor includes a number of fuel rods filled with a fuel material. A plurality of fuel rods have a partial effective fuel area filled with a fuel material and has a portion in which enrichment of a fissile nuclide is significantly reduced or the fissile nuclide does not exist at all on an axial level including a reactor shut-down zone at which subcriticality becomes small during a reactor operation period. The other fuel rods are filled with the fuel material throughout the entire axial length thereof. The first mentioned fuel rod may be provided with a partially interposed zone or may be constructed by a fuel rod having a length shorter than that of the other fuel rod. The tube means may be arranged in the fuel assembly so as to pass the moderator therethrough.

    摘要翻译: 用于核反应堆的燃料组件包括多个充满燃料的燃料棒。 多个燃料棒具有填充有燃料的部分有效的燃料区域,并且具有显着减少易裂变核素的富集的部分或者在包括反应堆关闭区域的轴向上完全不存在易裂变核素 在反应堆运行期间亚临界度变小。 其他燃料棒在其整个轴向长度处填充有燃料材料。 第一个提到的燃料棒可以设置有部分插入的区域,或者可以由具有比其他燃料棒的长度短的燃料棒构成。 管装置可以布置在燃料组件中以便使调节剂通过。

    Fuel assembly for nuclear reactor
    3.
    发明授权
    Fuel assembly for nuclear reactor 失效
    核反应堆燃料组件

    公开(公告)号:US4968479A

    公开(公告)日:1990-11-06

    申请号:US235629

    申请日:1988-08-24

    IPC分类号: G21C3/16 G21C3/322 G21C3/326

    摘要: A fuel assembly for a nuclear reactor includes a number of fuel rods filled with a fuel material. A water rod having a cross sectional area larger than that of each fuel rod is disposed at substantially the central portion of the fuel assembly. The fuel rods include first fuel rods having a whole effective fuel zone filled with a fuel material throughout the entire length thereof and second fuel rods each having an interposed zone in which enrichment of a fissile nuclide is significantly reduced or the fissile nuclide does not exist at all. The second fuel rods are arranged so as to surround the water rod so that the interposed zones are positioned on an axial level including a portion at which subcriticality is made small at a period in which maintenance of reactor shut-down margine is made difficult during the reactor operation period. The water rod may be provided with a lower portion having a cross sectional area smaller than that of an upper portion and short fuel rods are disposed so as to surround the lower portion of the water rod.

    摘要翻译: 用于核反应堆的燃料组件包括多个充满燃料的燃料棒。 具有比每个燃料棒的横截面积大的横截面积的水杆设置在燃料组件的基本上的中心部分。 燃料棒包括第一燃料棒,其整个有效燃料区在其整个长度上填充有燃料材料,第二燃料棒各自具有插入区域,其中易裂变核素的富集显着降低或裂变核素不存在于 所有。 第二燃料棒被布置成围绕水杆,使得插入的区域被定位在轴向平面上,该轴向水平包括使得在临时性较小的部分在反应堆关闭边缘的维持期间难以维持 电抗器运行期。 水杆可以设置有截面积小于上部的横截面积的下部,并且短的燃料棒被设置成围绕水杆的下部。

    Nuclear fuel assembly and nuclear reactor incorporating the same
    5.
    发明授权
    Nuclear fuel assembly and nuclear reactor incorporating the same 失效
    核燃料组装和核反应堆并入其中

    公开(公告)号:US5544211A

    公开(公告)日:1996-08-06

    申请号:US321618

    申请日:1994-10-12

    摘要: A fuel assembly has part length and full length fuel rods, and a pair of large-diameter water rods which occupy an area which can accommodate 7 fuel rods. Natural uranium regions are provided in the upper and lower end portions of the effective fuel zone of the fuel assembly. An intermediate region between these upper and lower natural uranium regions provides an enriched uranium region which has three axial sections: an upper section, a middle section and a lower section. The middle section has the highest average enrichment, the lower section has the medium average enrichment and the upper section has the smallest average enrichment. The difference in the average enrichment between the middle section and the lower section is smaller than that between the middle section and the upper section. The upper section has a lower concentration of burnable poison than other sections of the enriched uranium region. According to this arrangement, a greater burn-up degree of the fuel assembly can be achieved with minimal increment of the average enrichment, while preserving sufficiently large safety margin such as the thermal margin of the reactor and the reactor cold shut down margin.

    摘要翻译: 燃料组件具有部件长度和全长燃料棒,以及一对大直径水棒,其占据可容纳7个燃料棒的区域。 天然铀区设置在燃料组件的有效燃料区的上端部和下端部。 这些上部和下部天然铀区域之间的中间区域提供了具有三个轴向部分的浓缩铀区域:上部分,中间部分和下部分。 中段平均浓度最高,下段中等浓度富集,上段平均浓度最小。 中段与下段之间的平均富集差异小于中段与上段之间的平均浓度差。 上段与浓缩铀区其他部分的可燃毒物浓度较低。 根据这种布置,燃料组件的燃烧程度可以以平均富集的最小增量实现,同时保持足够大的安全裕度,例如反应堆的热裕度和反应堆的冷关闭余量。

    Image processing method and apparatus
    6.
    发明授权
    Image processing method and apparatus 失效
    图像处理方法和装置

    公开(公告)号:US5739827A

    公开(公告)日:1998-04-14

    申请号:US587660

    申请日:1996-01-17

    CPC分类号: G06T11/60

    摘要: An image process is performed using a computer, without needing any special knowledge by a user. First, when a picture on a screen is designated and inputted by an input unit, a check is made to determine if an input figure name corresponding to the input figure is defined in a first table stored in a memory. When it is judged that the input figure name is defined, a setting method of a value of a variable in the first table is determined. On the basis of the determined setting method, the value is set into the variable shown by the variable name in the first table. A check is made to determine if a figure shown by a connected figure name which is defined in a second table stored in the same memory as that of the first table, and is interlocked with the variable shown by the variable name exists on a screen. When it is judged that such a figure exists, the figure shown by the connected figure name is edited and displayed on the basis of the display type in the second table.

    摘要翻译: 使用计算机执行图像处理,而不需要用户的任何特殊知识。 首先,当通过输入单元指定并输入屏幕上的图片时,进行检查以确定在存储在存储器中的第一表中是否定义了与输入图形相对应的输入图形名称。 当判定输入图形名称被定义时,确定第一表中的变量的值的设定方法。 在确定的设置方法的基础上,将该值设置为第一个表中变量名所示的变量。 进行检查以确定在与存储在与第一表相同的存储器中的第二表中定义的连接图名称所示的图形是否与变量名称所示的变量互锁在屏幕上。 当判断出这样的图形时,根据第二表中的显示类型编辑并显示所连接的图形名称所示的图形。

    Core construction of a boiling nuclear reaction
    9.
    发明授权
    Core construction of a boiling nuclear reaction 失效
    核心建设沸腾的核反应

    公开(公告)号:US5271050A

    公开(公告)日:1993-12-14

    申请号:US881296

    申请日:1992-05-11

    摘要: A core construction for boiling water nuclear reactor in which a multiplicity of core units each having four fuel assemblies disposed in a square pattern adjacent to a control rod are arranged to form a reactor core, wherein the reactor core comprises control cells comprising four fuel assemblies which have been in the core more than three cyclic periods. The fuel assemblies located in the outer peripheral portion of the core are fuel assemblies which have been in the core more than three cyclic periods. Most of the core units comprise four fuel assemblies of first-, second-, third- or fourth-burning cyclic periods. The core is rotationally symmetric by 90 degrees. The core can be divided into four identical 1/4 cores by two vertical planes passing axial center lines of the core. Each of the 1/4 cores is substantially mirror symmetric about a plane passing the axial center line of the core.

    摘要翻译: 沸水核反应堆的核心结构,其中布置有多个核心单元,每个核心单元各自具有邻近控制棒的方形图案布置的四个燃料组件,以形成反应堆堆芯,其中反应堆堆芯包括控制单元,其包括四个燃料组件, 一直处于核心三个循环期。 位于核心的外周部分的燃料组件是燃料组件,它们在核心中超过三个周期。 大多数核心单元包括四个第一,第二,第三或第四燃烧循环周期的燃料组件。 核心旋转对称90度。 芯可以通过穿过芯的轴向中心线的两个垂直平面分成四个相同的1/4核心。 1/4核心中的每一个基本上相对于通过芯的轴向中心线的平面反射对称。

    Fuel assembly
    10.
    发明授权
    Fuel assembly 失效
    燃油组件

    公开(公告)号:US5249211A

    公开(公告)日:1993-09-28

    申请号:US859862

    申请日:1992-03-30

    IPC分类号: G21C3/328

    CPC分类号: G21C3/328 Y02E30/38

    摘要: A fuel assembly to be charged in a reactor core comprises a channel box extending vertically in the core and having a substantially square cross section, a number of fuel rods arranged in the channel box in the form of a lattice in cross sections thereof, the fuel rods extending vertically in the channel box with spaces between each other, a plurality of spacers for supporting the fuel rods in the channel box so as to maintain axial spaces between the fuel rods and upper and lower tie plates for supporting upper and lower end portions of the fuel rods. The fuel rods include first type fuel rods arranged at and near four corner portions of the channel box, each of the first type fuel rods being composed of upper and lower areas, except for extreme upper and lower ends, in which a fuel enrichment of the upper area is made lower than that of the lower area. Furthermore, the fuel rods further include other type fuel rods being arranged at portions other than the first type fuel rods and including second type fuel rods, each of said second type fuel rods being composed of upper and lower areas, except for extreme upper and lower ends, in which a fuel enrichment of the upper area is made higher than that of the lower area. The boundary portions between the first and second type fuel rods are disposed in substantially the same level or different levels.

    摘要翻译: 要装入反应堆堆芯的燃料组件包括一个在芯体中垂直延伸并且具有基本正方形横截面的通道箱,多个燃料棒以横截面的格子形式布置在通道箱中,燃料 在通道箱中垂直延伸的杆,彼此之间具有空间;多个间隔件,用于将燃料棒支撑在通道箱中,以便保持燃料棒与上下连接板之间的轴向空间,用于支撑上下端部 燃料棒。 燃料棒包括布置在通道箱的四个角部处和附近的第一类型的燃料棒,每个第一类型的燃料棒由上部和下部区域组成,除了极端的上部和下部,其中燃料浓缩 上部区域低于下部区域。 此外,燃料棒还包括其它类型的燃料棒,其布置在除了第一类型燃料棒之外的部分,并且包括第二类型燃料棒,每个所述第二类型燃料棒由上部和下部区域组成,除了极端的上部和下部 使上部区域的燃料浓缩高于下部区域的燃料浓缩。 第一和第二类型燃料棒之间的边界部分设置在基本相同的水平或不同的水平。