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公开(公告)号：US20210230743A1
公开(公告)日：2021-07-29
申请号：US17156746
申请日：2021-01-25
发明人： Shay L. HARRISON , John L. SCHNEITER , Joseph PEGNA , Ram K. GODUGUCHINTA , Kirk L. WILLIAMS , Erik G. VAALER
IPC分类号： C23C16/32 , C23C16/48 , C23C16/56 , C01B32/963 , C04B35/565 , C04B35/626 , G21C3/26
摘要： A method of forming a high purity granular material, such as silicon carbide powder. Precursors are added to a reactor; at least part of a fiber is formed in the reactor from the precursors using chemical deposition interacting with said precursors; and the granular material is then formed from the fiber. In one aspect, the chemical deposition may include laser induced chemical vapor deposition. The granular material may be formed by grinding or milling the fiber into the granular material, e.g., ball milling the fiber. In one example, silicon carbide powder having greater than 90% beta crystalline phase purity and less than 0.25% oxygen contamination can be obtained.
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公开(公告)号：US4911881A
公开(公告)日：1990-03-27
申请号：US211741
申请日：1988-06-27
申请人： Richard V. DeMars
发明人： Richard V. DeMars
摘要： A particle bed fuel element designed to accommodate expansion and contraction within the particle fuel bed. Porous inner and outer frits connected together by an end cap at a first end and radially guided by a shoulder at a second end receive fuel particles in the annulus formed therebetween. Compressive devices at each end of the frits and within the fuel bed maintain packing force to prevent looseness during contraction and allow expansion without excessive pressure being placed on the fuel particles. Pairs of beleville springs, wave springs, and pressurized thin-walled metal donuts may be used as the compressive devices.
摘要翻译： 颗粒床燃料元件，设计成适应颗粒燃料床内的膨胀和收缩。 通过端盖在第一端连接在一起并由第二端的肩部径向引导的多孔内部和外部玻璃料在其间形成的环形空间中容纳燃料颗粒。 玻璃料两端和燃料床两端的压缩装置保持包装力，以防止在收缩过程中松动，并允许膨胀而不会在燃料颗粒上施加过大的压力。 贝叶斯弹簧，波形弹簧和加压薄壁金属甜甜圈的对可以用作压缩装置。
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公开(公告)号：US3683975A
公开(公告)日：1972-08-15
申请号：US3683975D
申请日：1971-02-12
发明人： SEASE JOHN D , HARRINGTON FRANCIS E
摘要： Elongated multi-region LMFBR fuel elements are prepared by preplacing into a container a coarse fraction of material which includes all of the plutonium and a portion of the uranium in the appropriate regions of the fuel element and then infiltrating with vibration simultaneously a fine-sized fraction of depleted uranium-containing microspheres throughout all interstices in the coarse material in a single loading.
摘要翻译： 细长的多区域LMFBR燃料元件是通过在容器中预先放置在包含燃料元件的适当区域中的所有钚和一部分铀的一部分粗物质的容器中，然后同时以振动的方式同时浸入细小的馏分 的贫化铀微球贯穿于粗料中的所有空隙中。
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公开(公告)号：US20200043617A1
公开(公告)日：2020-02-06
申请号：US16558510
申请日：2019-09-03
摘要： A nuclear fuel assembly comprising a plurality of control rod guide assemblies. At least one of the control rod guide assemblies includes a guide tube having an axial dimension, the guide tube being supported by the plurality of grids and extending axially between the top nozzle and the bottom nozzle, the guide tube having an upper portion having a first radius and a lower portion having a second radius less than the first radius, and an external dashpot tube disposed around a portion of the lower portion in an area beginning at the bottom grid and extending toward the top nozzle.
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公开(公告)号：US3356586A
公开(公告)日：1967-12-05
申请号：US63110567
申请日：1967-04-14
申请人： WATSON JAMES F , GOEDDEL WALTER V
发明人： WATSON JAMES F , GOEDDEL WALTER V
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公开(公告)号：US3318779A
公开(公告)日：1967-05-09
申请号：US46276765
申请日：1965-06-09
申请人： TURNER RICHARD F , NEHRIG DEAN A , LEON HARRY I
发明人： TURNER RICHARD F , NEHRIG DEAN A , LEON HARRY I
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公开(公告)号：US3262858A
公开(公告)日：1966-07-26
申请号：US28440063
申请日：1963-05-31
发明人： HENRY GITTUS JOHN
CPC分类号： G21C3/338 , G21C3/042 , G21C3/044 , G21C3/20 , G21C3/26 , G21C3/30 , G21C3/32 , G21C3/322 , Y02E30/38 , Y10S428/936 , Y10S428/938 , Y10T428/12424 , Y10T428/12479 , Y10T428/12486 , Y10T428/12771 , Y10T428/12826
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10.发明授权公开(公告)号：US11289211B2
公开(公告)日：2022-03-29
申请号：US16558510
申请日：2019-09-03
IPC分类号： G21C3/334 , G21C3/332 , G21C7/20 , G21C3/26 , G21C3/34 , G21C3/326 , G21C3/322 , G21C3/33 , G21C7/117 , G21C7/12 , G21C9/02
摘要： Methods of installing an external dashpot tube around a control rod guide tube in a nuclear reactor fuel assembly are disclosed herein. The nuclear reactor fuel assembly may include a top nozzle, a bottom nozzle, and a plurality of grids. The various methods may comprise inserting a guide tube into a skeleton of the nuclear reactor fuel assembly to a lower middle grid, the lower middle grid being second closest grid to the bottom nozzle of the plurality of grids. The various methods may also include installing an external dashpot tube over the guide tube after it has been inserted to the lower middle grid; inserting the guide tube with the installed external dashpot tube to the bottom nozzle; attaching the guide tube to the skeleton; and bulging the guide tube onto the external dashpot tube.
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