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    • 1. 发明授权
    • Fuel assembly
    • 燃油组件
    • US06735267B2
    • 2004-05-11
    • US10227441
    • 2002-08-26
    • Akihito OriiJunichi KoyamaKoji NishidaMasao ChakiToru Kanazawa
    • Akihito OriiJunichi KoyamaKoji NishidaMasao ChakiToru Kanazawa
    • G21C332
    • G21C3/328G21Y2002/201G21Y2004/304Y02E30/38
    • A fuel assembly in accordance with the present invention comprises a plurality of first fuel rods and a plurality of second fuel rods having a length shorter than a length of the first fuel rod, and these two kinds of fuel rods are arranged in a fuel rod array of 10 rows by 10 columns. Two water rods are arranged in regions capable of arranging 8 fuel rods. The second fuel rods are not arranged in the outermost tier of the fuel rod array. Which satisfies the following conditions, that is, B≧60  (Equation 1) 15≦n≦20(n: integer)  (Equation 2) Awr/Ach≦0.149  (Equation 3) Lp/Lf≧11/24  (Equation 4) Awr/Ach≧(3.00×10−4×n2+6.00×10−4×n−1.2×10−2)×(Lp/Lf−1)+1.75×10−1  (Equation 5) Awr/Ach≦(8.63×10−4×n2−6.09×10−2×n+1.33×10−1)×(Lp/Lf−8.32×10−1)  (Equation 6) where Awr is a total sum of horizontal sectional areas of said water rods, Ach is a horizontal sectional area of a coolant flow passage in a bottom portion of said fuel assembly, Lf is an effective fuel length of said first fuel rod, n is number of said second fuel rods, Lp is an effective length of said second fuel rod, and B (GWd/t) is an average burn-up.
    • 根据本发明的燃料组件包括多个第一燃料棒和多个第二燃料棒,其长度短于第一燃料棒的长度,并且这两种燃料棒被布置在燃料棒阵列 10行×10列。 在能够布置8个燃料棒的区域中布置两个水棒。 第二燃料棒不配置在燃料棒阵列的最外层。 其满足以下条件,即,Awr是所述水棒的水平截面积的总和,Ach是所述燃料组件的底部中的冷却剂流动通道的水平截面面积,Lf是有效燃料长度 的所述第一燃料棒的数量,n是所述第二燃料棒的数量,Lp是所述第二燃料棒的有效长度,B(GWd / t)是平均燃耗。
    • 4. 发明授权
    • Fuel assembly and fuel spacer
    • 燃油组件和燃油间隔器
    • US5112571A
    • 1992-05-12
    • US510192
    • 1990-04-17
    • Akihito OriiOsamu YokomizoYasuhiro MasuharaKoji NishidaShigeto MurataShin-ichi KashiwaiKotaro InoueYuichiro Yoshimoto
    • Akihito OriiOsamu YokomizoYasuhiro MasuharaKoji NishidaShigeto MurataShin-ichi KashiwaiKotaro InoueYuichiro Yoshimoto
    • G21C3/322G21C3/344
    • G21C3/322G21C3/344Y02E30/38
    • In a fuel assembly having fuel rods inserted into regularly arranged cells of a fuel spacer which keeps the fuel rods correctly spaced from one another and has spacer elements disposed in a plurality of stages in the longitudinal direction of the fuel rods, the fuel spacer comprises vanes formed on the cells in such a manner that each vane is bent from a cut formed in a part of the side wall of the cell. The vanes obliquely project into the corresponding spaces between adjacent fuel rods and allow a coolant flowing through the spaces and forming two-phase flows to generate swirling flows toward the fuel rods. The fuel spacer may alternatively comprise either thin-walled cylinders having built-in vanes or spiral vanes, which are fixed to the spacer that has not been subjected to any direct machining. Also disclosed is a fuel assembly provided with any of the above-described fuel spacers. The arrangement of the present invention enables, while assuring a sufficient strength for maintaining fuel rods in their correct position, the transfer of heat from the fuel rods to the coolant to be promoted so as to raise the allowable power level of the fuel assembly, and enables the void ratio to be lowered so as to increase the reactivity.
    • 在具有插入燃料间隔件的规则布置的单元中的燃料棒的燃料组件中,燃料棒将燃料棒彼此正确地间隔开并具有沿着燃料棒的纵向设置成多级的间隔元件,燃料间隔件包括叶片 形成在电池上,使得每个叶片从形成在电池的侧壁的一部分中的切口弯曲。 叶片倾斜地突出到相邻燃料棒之间的相应空间中,并允许冷却剂流过空间并形成两相流以产生朝向燃料棒的旋流。 燃料间隔器可以可选地包括具有内置叶片或螺旋叶片的薄壁圆柱体,其固定到未经受任何直接加工的间隔件。 还公开了一种具有任何上述燃料间隔件的燃料组件。 本发明的结构在确保足够的强度以保持燃料棒处于其正确位置的同时,能够将热量从燃料棒传递到冷却剂以提高燃料组件的允许功率水平, 使空隙率降低,从而提高反应性。