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1.发明授权Lower tie plate strainers having double plate with offset holes for boiling water reactors 失效具有用于沸水反应堆的带有偏移孔的双板的下连接板过滤器
公开(公告)号：US5345483A
公开(公告)日：1994-09-06
申请号：US160721
申请日：1993-12-02
IPC分类号： G21C3/33 , G21C3/30 , G21C3/32 , G21C19/307 , G21C15/00
CPC分类号： G21C19/307 , G21C3/3206 , G21Y2002/201 , G21Y2004/30 , Y02E30/40
摘要： In a boiling water nuclear reactor fuel bundle, a debris catching arrangement is disclosed for incorporation within the flow plenum up stream or below the rod supporting grid of the lower tie plate assembly. The device is preferably placed within the lower tie plate flow plenum between the fuel bundle inlet orifice and the rod supporting grid structure supporting the fuel rods; alternate placement can include any inlet channel upstream of the fuel rods including the fuel support casting. Paired plates defining offset holes and bosses are utilized. The bosses are supported at plate webbing between the respective holes. The holes are preferably square in plan with appropriately relieved and rounded corners defining the edges of the webbing. The bosses may be cylindrical, square or rectangular in cross-section. In confrontation of plates to form the debris catching grid, each boss from one plate confronts a hole from the remaining plate. A system of edge ridges in conjunction with the bosses at each plate edge maintains the plates spatially separated with the bosses of each plate spaced from the webbing of the opposite plate. In the preferred embodiment, the plates are captured in the flow plenum of a two part tie plate. There results a three dimensional and sturdy debris catching construction which has low flow resistance through the continuum of defined flow passages while maintaining excellent debris entraining properties.
摘要翻译： 在沸水核反应堆燃料束中，公开了一种碎屑捕集装置，用于结合在上部流动通道内或下连接板组件的杆支撑栅格下方。 该装置优选地放置在燃料束入口孔和支撑燃料棒的杆支撑格栅结构之间的下连接板流通风室内; 替代放置可以包括燃料棒上游的任何入口通道，包括燃料支撑铸件。 使用定义偏移孔和凸起的配对板。 凸台被支撑在相应的孔之间的板条带上。 这些孔优选地是平面的，具有限定织带边缘的适当减轻和圆角。 凸台可以是圆柱形，正方形或矩形的横截面。 在板对面形成碎片捕捉格栅时，一块板的每个凸台面对剩下的板上的一个孔。 与每个板边缘处的凸起结合的边缘脊的系统使得板的空间分离，每个板的凸起与相对板的织带间隔开。 在优选实施例中，板被捕获在两部分连接板的流动通风室中。 产生三维和坚固的碎片捕获结构，其通过限定的流动通道的连续体具有低流动阻力，同时保持优异的碎屑夹带性能。
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公开(公告)号：US5528640A
公开(公告)日：1996-06-18
申请号：US335959
申请日：1994-11-07
CPC分类号： G21C3/3206 , Y02E30/40
摘要： A fuel bundle and lower tie plate assembly for a nuclear reactor includes a plurality of fuel rods supported between an upper tie plate and a lower tie plate assembly. The lower tie plate assembly includes an upper grid portion and a lower body portion, the upper grid portion having a plurality of fuel rod supporting bosses interconnected by a plurality of webs thus forming flow openings between the bosses. The body portion includes an inlet nozzle and a peripheral wall extending between the bottom nozzle and the upper grid portion to define a flow volume therein. A debris catcher is located within the flow volume and includes a pair of superposed plates, the plates each having a plurality of holes of substantially the same size, shape and pitch, but wherein the holes of one of the pair of plates are offset from the holes of the other of the pair of plates by one half the hole pitch.
摘要翻译： 用于核反应堆的燃料束和下连接板组件包括支撑在上连接板和下拉板组件之间的多个燃料棒。 下连接板组件包括上格栅部分和下主体部分，上格栅部分具有多个燃料棒支撑凸起，所述多个燃料棒支撑凸起由多个腹板互连，从而在凸台之间形成流动开口。 主体部分包括入口喷嘴和在底部喷嘴和上部格栅部分之间延伸以在其中限定流体积的周壁。 碎屑捕集器位于流体积内并且包括一对叠置的板，每个板具有大致相同尺寸，形状和间距的多个孔，但是其中一对板中的一个的孔偏离 一对板的另一个孔的孔为孔间距的一半。
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3.发明授权Lower tie plate with stepped holes to control pressure drop and flow distribution 失效下连接板带有阶梯孔，用于控制压降和流量分布
公开(公告)号：US4997621A
公开(公告)日：1991-03-05
申请号：US322480
申请日：1989-03-13
CPC分类号： G21C3/322 , G21Y2002/201 , G21Y2002/207 , G21Y2004/302 , Y02E30/38
摘要： An improved lower tie plate having increased fluid flow resistance is disclosed for use in a boiling water nuclear reactor. The fuel bundle includes the lower tie plate, an upper tie plate, and a plurality of fuel rods supported therebetween in vertical upstanding relation, with the fuel rods surrounded by a square sectioned channel. In the preferred embodiment, some of the upper fuel rods are of partial length. The surrounding channel confines the fluid flow through the fuel bundles between the tie plates for the extraction of heat from the fuel rods undergoing a fission reaction. The lower tie plate includes a first group of apertures for the support of the fuel rods to selected positions in the 9x9 matrix; appropriate numbers of these apertures are threaded for tying the upper and lower tie plates together with tie rods. The matrix is interrupted at larger apertures for the support of moderator containing water rods. The tie plate also includes a second matrix of through holes acting as fluid energy dissipation orifices. These fluid energy dissipation orifices include a first small downwardly exposed fluid receiving aperture which discharges to a second and larger upwardly exposed flow area preferably formed in the shape of a concentric aperture. In the preferred embodiment the inlet to the first concentric and small downwardly exposed fluid receiving aperture is rounded for the intake of fluid with maximum flow predictability. The outlet from the first concentric and small downwardly exposed fluid receiving aperture is abrupt to produce maximum predictable energy dissipating turbulence in the upwardly exposed fluid discharge area. Passage of fluid through the energy dissipation apertures causes an increased pressure drop at the lower tie plate, for the suppression of thermal-hydraulic flow instabilities, and coupled thermal-hydraulic nuclear instabilities. A serendipitous effect is present in that the increased pressure drop causes uniform fluid flow in the interior of the fuel bundle immediate the lower tie plate.
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公开(公告)号：US5663993A
公开(公告)日：1997-09-02
申请号：US542345
申请日：1995-10-12
CPC分类号： G21C3/322 , G21Y2002/204 , G21Y2004/302 , G21Y2004/403 , Y02E30/38
摘要： In a nuclear fuel rod assembly including a plurality of fuel rods and at least one water rod held together in a bundle, and wherein end plugs at the lower ends of the fuel rods and the at least one water rod engage a lower tie plate, an improvement wherein the end plug at the lower end of the at least one water rod is hollow and includes a multi-diameter flow metering bore for regulating coolant flow into the water rod.
摘要翻译： 在一个核燃料棒组件中，包括多个燃料棒和至少一个以棒束为一体的水杆，并且其中燃料棒的下端和至少一个水杆的端塞接合下连接板， 改进之处在于，至少一个水杆的下端处的端塞是中空的，并且包括用于调节进入水杆的冷却剂流的多直径流量计量孔。
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