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    Coated particle fuel for nuclear reactors and to the manufacture of such fuel
    51.
    发明授权
    Coated particle fuel for nuclear reactors and to the manufacture of such fuel 失效
    用于核反应堆的涂覆颗粒燃料和这种燃料的制造

    公开(公告)号：US3866043A

    公开(公告)日：1975-02-11

    申请号：US39623273

    申请日：1973-09-11

    申请人： CENTRAL ELECTR GENERAT BOARD

    发明人： FRECK DAVID VERNON

    IPC分类号： G01T7/04 ,  G21C3/62 ,  G21C17/06 ,  G01T1/00 ,  G21C3/02

    CPC分类号： G21C3/626 ,  G01T7/04 ,  G21C17/06 ,  Y02E30/38

    摘要： Particle fuel, such as is used in high temperature nuclear reactors, and having the fuel material coated with a pyrolytic carbon coating impermeable to gaseous fission products and embedded in a matrix of graphite, incorporates, for the purpose of this invention, radium 226 preferably in the binder for the grains of the fuel. The integrity of the pyrolytic carbon coating can then be checked before irradiation in a reactor by circulating an inert gas, e.g., argon, over the particles at a temperature in excess of 800*C, e.g., in the final carbonisation step during manufacture or immediately before vacuum degassing. The inert gas after passing over the particles is checked for the presence of radon 222, e.g., by passing the gas into a decay chamber having a filter in its outlet to collect radio-active solid daughters of radon and counting the alpha particles emitted by the material collected on the filter.

    摘要翻译： 颗粒燃料，例如在高温核反应堆中使用，并且具有涂覆有不透气体裂变产物并且嵌入石墨基质中的热解碳涂层的燃料材料，为了本发明的目的，包含镭226优选地在 用于燃料颗粒的粘合剂。 然后可以在反应器中照射之前，通过在超过800℃的温度下使惰性气体（例如氩）循环在颗粒上，例如在制造过程中的最终碳化步骤中或立即进行热解碳涂层的完整性 真空脱气前。 检查通过颗粒之后的惰性气体是否存在氡222，例如通过将气体通过其出口处具有过滤器的衰变腔室来收集放射性活性固体氡的氡并计数由氡气发射的α粒子 在过滤器上收集的材料。

    Failure indicator for nuclear reactor fuel element
    52.
    发明授权
    Failure indicator for nuclear reactor fuel element 失效
    核反应堆燃料元件故障指示

    公开(公告)号：US3846235A

    公开(公告)日：1974-11-05

    申请号：US30354872

    申请日：1972-11-03

    申请人： TRANSFER SYSTEMS

    发明人： JONES C ,  GOLDMAN A ,  ROWE D

    IPC分类号： G21C3/02 ,  G21C17/07 ,  G21C3/18 ,  G21C17/06

    CPC分类号： G21C17/07

    摘要： 1. A fuel element for a nuclear reactor comprising an elongated sealed enclosure containing nuclear fuel, said enclosure including at one end a pressure-tight non-magnetic extension, an indicator pin within the enclosure and having a portion comprising ferromagnetic material extending within the said extension, said indicator pin being movable in the elongated direction of the enclosure from a first position to a second position, resilient means connected to the indicator pin for biasing the indicator pin for movement toward the second position, pressure differential means within the enclosure for maintaining the indicator pin in its first position against the force exerted by the resilient means, said pressure differential means being disabled from maintaining the indicator pin in its first position when an opening in the enclosure causes a pressure loss within the enclosure whereby the resilient means displaces the indicator pin to its second position indicative of failed fuel, the pressure-tight extension having a reduced width compared with that of the enclosure portion containing the nuclear fuel, and the ferromagnetic material portion being located entirely within the reduced-width extension of both the first and second positions.

    SYSTEMS AND METHODS FOR MAINTAINING COVER GAS IN NUCLEAR REACTORS
    56.
    发明申请
    SYSTEMS AND METHODS FOR MAINTAINING COVER GAS IN NUCLEAR REACTORS 审中-公开

    公开(公告)号：US20190164653A1

    公开(公告)日：2019-05-30

    申请号：US15827881

    申请日：2017-11-30

    申请人： GE-Hitachi Nuclear Energy Americas LLC

    发明人： Brian S. Hunt ,  Derek Bass

    IPC分类号： G21C1/02 ,  G21C3/02 ,  G21C7/32 ,  G21C15/18

    摘要： Cover gas control systems include a reservoir and injection path for direct injection into fuel transfer machinery. If seals in the fuel handling machinery leak, cover gas is provided from the reservoir to flow to the leak without contamination from a reactor to which the fuel transfer machinery is joined. This providing cover gas may be passive or automatic in response to a detected low pressure level, detected ambient air ingress, low volume level of cover gas, or manually actuated through an operator. The cover gas may be injected from below the leak but above the reactor. A limitation in the injection path keeps cover gas injection at rates sufficient to allow operator reaction and sealing before the reservoir is depleted. A pressure pulse transmitter, blowout preventer, and transfer port plug are useable in the systems, which can be implemented in fuel handling machinery for reactors using a cover gas.

    FUEL ASSEMBLY
    59.
    发明申请
    FUEL ASSEMBLY 审中-公开
    燃油总成

    公开(公告)号：US20160035441A1

    公开(公告)日：2016-02-04

    申请号：US14856084

    申请日：2015-09-16

    申请人： Lightbridge Corporation

    发明人： Aaron Totemeier ,  Sergey M. Bashkirtsev ,  Alexey G. Morozov

    IPC分类号： G21C3/02

    CPC分类号： G21C1/20 ,  G21C3/08 ,  G21C3/28 ,  G21C3/322 ,  G21C3/326 ,  G21C3/328 ,  G21C3/58 ,  G21C21/10 ,  Y02E30/38

    摘要： A fuel assembly for use in a core of a nuclear power reactor. The assembly includes a frame shaped and configured to fit within the nuclear reactor internal core structure; and a plurality of helically twisted fuel elements supported by the frame in a fuel rod bundle. Each of the fuel elements includes fissile material. When viewed in a cross-section that is perpendicular to an axial direction of the fuel assembly, the outermost fuel elements of the fuel rod bundle define a substantially circular perimeter. Other features, and a nuclear reactor, are also described.

    摘要翻译： 用于核动力堆核心的燃料组件。 组件包括形状并构造成装配在核反应堆内部核心结构内的框架; 以及由燃料棒束中的框架支撑的多个螺旋扭转的燃料元件。 每个燃料元件都包括裂变材料。 当在垂直于燃料组件的轴向方向的横截面中观察时，燃料棒束的最外面的燃料元件限定基本圆形的周边。 还描述了其他特征和核反应堆。