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公开(公告)号：US5297176A
公开(公告)日：1994-03-22
申请号：US887264
申请日：1992-05-22
CPC分类号： G21C5/06 , G21Y2002/303 , G21Y2002/401 , G21Y2004/301 , G21Y2004/50 , Y02E30/40
摘要： The guide pin aligning a top nozzle of a nuclear fuel assembly to an upper core plate of a nuclear reactor, is replaced working exclusively from below the upper core plate. The replacement guide pin has a shaft portion engaged with the upper core plate and the clamping nut which held the original guide pin, by threadable connection and/or by an expansion fitting. A shoulder on the pin bears against a lower surface of the upper core plate, and a nose of the pin is received in the top nozzle of the fuel assembly. A preferred expansion fitting has a bushing with ridges on its outer surface and a conical inside surface, and is inserted into the bored out original guide pin shaft. A threaded conical plug is pulled axially with rotation of the replacement pin shaft to expand the bushing. The ridges rigidly lock the replacement pin between the shoulder and the clamping nut. By attaching the replacement pin to the stub of the original pin, the invention utilizes existing attachments of the original pin to the upper core plate.
摘要翻译： 将核燃料组件的顶部喷嘴对准核反应堆的上部核心板的引导销仅由上部芯板的下方替换。 更换导向销具有与上芯板和夹紧螺母接合的轴部分，该夹紧螺母通过螺纹连接和/或通过膨胀配件保持原始引导销。 销上的一个肩部靠在上部芯板的下表面上，并且销的鼻子被容纳在燃料组件的顶部喷嘴中。 优选的膨胀配件具有在其外表面上具有隆起的衬套和锥形内表面，并且插入到钻孔的原始导向销轴中。 螺纹圆锥塞被轴向拉动，替换销轴的旋转以使衬套膨胀。 脊刚性地将替换销锁定在肩部和夹紧螺母之间。 通过将替换销连接到原始销的短截线，本发明利用原始销的现有附件到上部芯板。
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公开(公告)号：US4681728A
公开(公告)日：1987-07-21
申请号：US715125
申请日：1985-03-22
CPC分类号： G21C7/27 , G21C7/117 , G21Y2002/204 , G21Y2004/30 , G21Y2004/304 , Y02E30/39
摘要： A nuclear reactor including, in the upper internals, a guide structure capable of effectively accommodating and guiding without binding the large number of neutron-absorber rods included in modern reactors of improved efficiency. The neutron-absorber rods include control rods, gray rods, and water-displacement rods. All rods are suspended in clusters from spiders or vanes. The upper internals of the reactor includes cruciform guides for the control-rod and gray-rod clusters. Each of these guides is composed of a plurality of vertical guide sections of transverse cruciform cross section. Plates extending throughout the cross-section of the reactor are supported between each pair of successive guide sections. The plates are perforated, the perforations in each plate being patterned to pass the water-displacement rod clusters. The plates are oriented so that the patterned perforations are aligned to serve as guides for the water-displacement rod clusters. The plates are of very large diameter and, as perforated, would not be self-supporting unless they were very thick. To overcome this drawback, each plate is formed of separate plate sections which are, when assembled nested together, like the parts of a "jig-saw puzzle".
摘要翻译： 一种核反应堆，其包括在上部内部中的能够有效地容纳和引导而不与现有反应器中包括的提高效率的大量中子吸收棒结合的引导结构。 中子吸收棒包括控制杆，灰棒和排水杆。 所有的杆从蜘蛛或叶片悬挂在群集中。 反应堆的上部内部包括用于控制棒和灰棒的十字形导轨。 这些导轨中的每一个由横向十字形截面的多个垂直导向部构成。 在整个反应器的横截面上延伸的板被支撑在每对连续的引导部分之间。 板被穿孔，每个板中的穿孔被图案化以通过水位移杆组。 板被定向成使得图案化的穿孔对齐以用作用于排水杆组的引导件。 这些板的直径非常大，并且如果穿孔，则不会自支撑，除非它们非常厚。 为了克服这个缺陷，每个板由独立的板部分组成，当组装成嵌套在一起时，就像“夹具谜题”的部件。
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3.发明授权System providing improved guidance support with restricted coolant flow for control rods in the upper head plenum of a nuclear reactor 失效系统提供改进的指导支持与限制性冷却液流量控制核在核反应堆的上层头
公开(公告)号：US5053189A
公开(公告)日：1991-10-01
申请号：US422261
申请日：1989-10-16
CPC分类号： G21C5/02 , G21C7/08 , G21Y2002/101 , G21Y2004/30 , G21Y2004/302 , Y02E30/39
摘要： A new system is provided for control rod guidance support with wear mitigating features in a nuclear reactor pressure vessel.The upper guide tube and the lower guide tube structures house the control rod when it is withdrawn from the fuel core.The upper guide tube has a top enclosure plate with a drive rod opening therethrough sized to provide a predetermined clearance space between the drive rod and the top enclosure plate and to direct coolant flow between the upper and outlet plenums and through the guide tube assembly to allow transmittal of upper plenum bypass cooling flow to the outlet plenum.Structure is provided for restricting coolant flow through the top plate clearance space to reduce control rod wear. A coupler secures the drive and control rods in end-to-end relation within the guide tube assembly. The coupler is located just below the top guide tube enclosure plate with the control rod fully withdrawn. The coolant restricting structure includes a flow restricting sleeve secured to the coupler and extending upwardly over the drive rod through the top guide tube enclosure plate. A flow restrictor is located above and secured to the top guide tube enclosure plate, and it has an upper portion disposed about and spaced from the flow restricting sleeve to provide a flow gap having a flow area substantially equal to the clearance space. The flow restrictor is otherwise structured to provide at least one contraction-expansion loss above the top guide tube plate for guide tube coolant flow through the flow gap.
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公开(公告)号：US4637914A
公开(公告)日：1987-01-20
申请号：US574839
申请日：1984-01-30
申请人： David E. Boyle , James R. Chrise
发明人： David E. Boyle , James R. Chrise
CPC分类号： G21C7/00 , G21Y2002/402 , G21Y2004/30 , Y02E30/39 , Y10T403/3946 , Y10T403/599
摘要： A quick release guide sleeve assembly comprises an outer sleeve, an inner sleeve axially slidably received in the outer sleeve and having first and second axial positions with respect to the outer sleeve; and a locking mechanism movably mounted on the outer sleeve for frictionally engaging wall surfaces defining an opening for receiving the outer sleeve. The locking mechanism has a locking position in which at least part of the locking mechanism projects radially outwardly beyond the external circumferential surface of the outer sleeve. The locking mechanism further has a releasing position in which the locking mechanism is in a radially inwardly withdrawn state relative to the circumferential surface of the outer sleeve. The assembly further includes a camming arrangement carried on the inner sleeve for pressing the locking mechanism into the locking position when the inner sleeve is in the first axial position and for allowing the locking mechanism to assume the releasing position when the inner sleeve is in the second axial position. A spring urges the inner sleeve continuously into the first axial position.
摘要翻译： 快速释放引导套筒组件包括外套筒，内套筒，其可轴向滑动地容纳在外套筒中并具有相对于外套筒的第一和第二轴向位置; 以及锁定机构，其可移动地安装在所述外套筒上，用于摩擦地接合限定用于容纳所述外套筒的开口的壁表面。 锁定机构具有锁定位置，其中锁定机构的至少一部分径向向外突出超出外套筒的外周表面。 锁定机构还具有释放位置，其中锁定机构相对于外套筒的圆周表面处于径向向内取出的状态。 组件还包括承载在内套筒上的凸轮装置，用于当内套筒处于第一轴向位置时将锁定机构按压到锁定位置，并且当内套筒处于第二轴向位置时允许锁定机构处于释放位置 轴向位置。 弹簧将内套筒连续地推入第一轴向位置。
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