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公开(公告)号：US3770583A
公开(公告)日：1973-11-06
申请号：US3770583D
申请日：1971-05-20
Applicant: COMBUSTION ENG
Inventor： KLUMB R , HUTCHINSON J
Abstract: The invention provides a hold-down device which maintains a net downward force on a fuel assembly in a nuclear reactor under all thermal and hydraulic conditions in the reactor core region. The hold-down device is particularly applicable in reactors having stainless steel support barrels and Zircaloy guide tubes. The hold-down device of the preferred embodiment of the invention is comprised of coil springs coaxially disposed about alignment posts which extend upwardly from the top end plate of each fuel assembly. A hold-down plate is slideably mounted on the alignment posts and the coil springs are interposed, in compression, between the hold-down plate and the top end plate. In use, the coil springs bias the hold-down plate upwardly against a core alignment plate to provide a downward force on the fuel assembly. The hold-down plate may also serve as a lifting surface for the fuel assembly during fuel handling.
Abstract translation: 本发明提供了一种压缩装置，其在反应堆堆芯区域的所有热和水力条件下，在核反应堆中的燃料组件上保持净向下的力。 压紧装置特别适用于具有不锈钢支撑筒和Zircaloy导管的反应器。
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公开(公告)号：US3853703A
公开(公告)日：1974-12-10
申请号：US26834772
申请日：1972-07-03
Applicant: COMBUSTION ENG
Inventor： ANTHONY A , HUTCHINSON J , KLUMB R
Abstract: A hold-up device for nuclear reactor fuel assemblies which precludes the possibility of axial movement of the assemblies due to hydraulic forces under all thermal and flow conditions in the reactor core region. The fuel assembly is spring loaded against the upper guide structure, and supported so as to allow significant thermal expansion differential between the assembly and its support structure. In a preferred embodiment the fuel assembly lower end fitting alignment posts are extended into the core support structure where each post is supported by a spring contained within a cartridge which is press fitted into the core support plate. The fuel assembly is loaded against the upper guide structure by the hold-up device during installation of the upper guide structure. The device is insensitive to all hydraulic load increases since the flow force ia opposed by the upper guide structure.
Abstract translation: 用于核反应堆燃料组件的搁置装置，其排除了由于在反应堆堆芯区域中的所有热和流动条件下的液压力而使组件轴向移动的可能性。 燃料组件被弹簧加载抵靠上导向结构，并且被支撑以便允许组件与其支撑结构之间的显着的热膨胀差异。 在优选实施例中，燃料组件下端配件对准柱延伸到芯支撑结构中，其中每个柱由容纳在盒内的弹簧支撑，该弹簧压配合到芯支撑板中。 在上部导向结构的安装期间，燃料组件通过支撑装置抵靠上部导向结构。 由于上部引导结构所对应的流动力，该装置对所有的液压载荷增加都不敏感。
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公开(公告)号：US3814667A
公开(公告)日：1974-06-04
申请号：US32635473
申请日：1973-01-24
Applicant: COMBUSTION ENG
Inventor： KLUMB R , HUTCHINSON J
Abstract: The invention provides a hold-down device which maintains a net downward force on a fuel assembly in a nuclear reactor under all thermal and hydraulic conditions in the reactor core region. The hold-down device is particularly applicable in reactors having stainless steel support barrels and Zircaloy guide tubes. The hold-down device of the preferred embodiment of the invention is comprised of coil springs coaxially disposed about alignment posts which extend upwardly from the top end plate of each fuel assembly. A hold-down plate is slideably mounted on the alignment posts and the coil springs are interposed, in compression, between the hold-down plate and the top end plate. In use, the coil springs bias the hold-down plate upwardly against a core alignment plate to provide a downward force on the fuel assembly. The hold-down plate may also serve as a lifting surface for the fuel assembly during fuel handling.
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