Guide structure for control elements
阅读：874发布：2022-11-23
专利汇可以提供Guide structure for control elements专利检索，专利查询，专利分析的服务。并且A guide structure for aligning fuel assemblies forming a nuclear core of a nuclear reactor and for guiding a plurality of control elements for telescoping movement within guide channels of fuel assemblies. Two spaced tube sheets, rigidly connected by a plurality of hollow tubes extending therebetween, are supported by a support means relative to the nuclear core with each of the hollow tubes being in alignment with a guide channel of the fuel assemblies. A plurality of yoke means, each of which interconnects at least two of a plurality of control elements situated within some of the hollow tubes, are provided whereby the interconnected control elments telescopingly move as a unit within the guide channels.，下面是Guide structure for control elements专利的具体信息内容。
1. A nuclear reactor comprising, in combination: a vessel having a nuclear core fixedly positioned therein; a plurality of fuel assemblies comprising said nuclear core, each of said fuel assemblies having a plurality of longitudinally extending fuel elements and a plurality of longitudinally extending guide channels; an upper plate and lower plate in said vessel, said lower plate overlying all of said plurality of fuel assemblies and said upper plate being spaced above said lower plate; a plurality of hollow tubes extending between and rigidly connected to said upper plate and said lower plate, the wall of each of said hollow tubes being circumferentially continuous substantially over the length thereof, and each of said hollow tubes being in alignment with only one of said guide channels; a support means for supporting said two spaced plates in said vessel; a plurality of control elements each of which is situated for telescoping movement within only one of said hollow tubes and said channel in alignment therewith; a plurality of yoke means each of which is wholly within said vessel and which interconnects at least two of said plurality of control elements, each of said yoke means having a plurality of laterally extending fingers each of which overlies and is in alignment with one of said hollow tubes and which is connected to said control element situated therein; connection means for each of said yoke means connected to said yoke means inside said vessel and passing outside of said vessel, each of said interconnected connection means, yoke means and control elements forming a rigid and essentially nonflexible unitary structure; and drive means positioned outside of said vessel for each of said connection means, each of said drive means being connected to one of said connection means for driving said control elements connected thereto between a fully inserted position and a fully retracted position to control the reactivity of said nuclear core during normal operation, the position of each of said yoke means for both of said control element positions being vertically above both of said upper and lower plates.
2. The combination of claim 1 further including a plurality of protective guidance means above said upper plate, each of said protective guidance means guiding said control elements interconnected to one of said yoke means so as to prevent interference between said control elements interconnected to said one of said yoke means and the other of said control elements and said yoke means.
3. The combination of claim 2 wherein said protective guidance means are shrouds each of which enshrouds one of said yoke means and saId control elements interconnected thereto.
4. The combination of claim 3 wherein said shrouds each have flow openings on the side walls thereof.
5. The combination of claim 2 wherein said protective guidance means are a plurality of longitudinally extending split tubes, each of said split tubes having a longitudinal slot along the length thereof to allow passage of said laterally extending finger connected to said control element for which said tube is providing guidance during vertical travel of said finger.
6. The combination of claim 1 wherein said fuel assemblies each have alignment means, and wherein each of said alignment means has one end in registry with one of said channels of said fuel assemblies and has its other end received within and positioned by one of said hollow tubes.
7. The combination of claim 6 wherein: said reactor vessel includes a lip; said support means includes a cylindrical barrel integral with one of said upper and lower plates; and said barrel includes outwardly extending flanges which rest on said lip of said reactor vessel.
8. The combination of claim 1 wherein at least one of said yoke means has laterally extending fingers which are connected to a plurality of said control elements which telescopingly move into said channels of a plurality of said fuel assemblies.
9. The combination of claim 7 wherein each of said hollow tubes extends between and through each of said upper and lower plates one end of each of said hollow tubes having flanges engaging one of said upper and lower plates and the other end being threaded; and wherein there is provided a nut and an outer concentric tube for each of said hollow tubes, each of said outer concentric tubes being positioned around one of said hollow tubes and between said upper and lower plates and each of said nuts being threaded onto said threaded end of said hollow tubes whereby each of said hollow tubes is placed in tension and each of said outer concentric tubes is placed in compression.
10. The combination of claim 8 wherein at least one of said control elements of said plurality is free for individual telescoping movement within one of said hollow tubes and said channel in alignment therewith independent of the remainder of said control elements.
11. The combination of claim 10 wherein said one yoke means interconnects a plurality of said control elements which telescopingly move into said channels of two of said fuel assemblies.
12. The combination of claim 10 wherein said one yoke means interconnects a plurality of said control elements which telescopingly move into said channels of three of said fuel assemblies.
13. The combination of claim 10 wherein said one yoke means interconnects a plurality of said control elements which telescopingly move into said channels of four of said fuel assemblies.
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