Fuel assembly hold-up device专利检索-燃料组件堆芯核反应堆核能专利检索查询-专利查询网

Fuel assembly hold-up device

阅读：862发布：2022-11-20

专利汇可以提供Fuel assembly hold-up device专利检索，专利查询，专利分析的服务。并且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.，下面是Fuel assembly hold-up device专利的具体信息内容。

权利要求

1. In a nuclear reactor core, means defining lower core support structure; means defining upper core alignment structure; a plurality of fuel assemblies vertically disposed between said lower core support structure and said upper core alignment structure, each of said assemblies comprising an upper end fitting, a lower end fitting, structural means attached to each of said end fittings and supporting said fittings in parallel spaced relationship, a plurality of elongated fuel elements disposed in a generally parallel array, and support structures connected to said structural means and receiving therein said fuel elements to maintain them in a vertically extending position between said end fittings; means associated with said upper core alignment structure and said upper end fittings for laterally restraining each of said fuel assemblies while allowing limited axial movement thereof: a plurality of alignment posts affixed to each of said lower end fittings and extending downwardly therefrom; a post engaging means, associated with each of said alignment posts, affixed to and extending upwardly from said lower core support structure for slidably receiving and laterally restraining said alignment posts, said post engaging means including a spring containment section having spring retaining means at its lower end and means for transmitting downward force on said spring retaining means to said lower core support structure; and coil spring means in partial compression disposed within said spring receiving section, reacting downwardly against said lower core support structure and reacting upwardly through said lower end fittings to urge said fuel assemblies in engagement with said upper core alignment structure.

2. The apparatus of claim 1 wherein said spring containment section extends through said lower core support structure and projects downwardly therefrom, and wherein said means for transmitting downward force comprises a downwardly facing shoulder on said post engaging means engaging an upwardly facing surface of said lower core support structure.

3. The apparatus of claim 2 wherein said coil spring means comprises two coaxially disposed coil springs.

4. The apparatus of claim 3 wherein said spring containment section is circular in cross section and includes an elongated cylindrical member smaller in diameter than said section which projects upwardly from the lower end of and along the axis of said section into the interior thereof; and wherein the inside diameter of the first of said two springs is substantially equal to the diameter of said cylindrical member and the outside diameter of the second of said two springs is substantially equal to the inside diameter of said spring receiving section, whereby said two springs are substantially restrained from lateral motion within said section.

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Fuel assembly hold-up device

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