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    PASSIVE REACTIVITY CONTROL IN A NUCLEAR FISSION REACTOR
    35.
    发明申请
    PASSIVE REACTIVITY CONTROL IN A NUCLEAR FISSION REACTOR 有权

    公开(公告)号：US20220254524A1

    公开(公告)日：2022-08-11

    申请号：US17716964

    申请日：2022-04-08

    申请人： TerraPower, LLC

    发明人： Jesse R. Cheatham, III ,  John R. Gilleland ,  Jon D. McWhirter

    IPC分类号： G21C7/30 ,  G21C3/18 ,  G21C3/24 ,  G21C7/02

    摘要： A nuclear reactor includes a passive reactivity control nuclear fuel device located in a nuclear reactor core. The passive reactivity control nuclear fuel device includes a multiple-walled fuel chamber having an outer wall chamber and an inner wall chamber contained within the outer wall chamber. The inner wall chamber is positioned within the outer wall chamber to hold nuclear fuel in a molten fuel state within a high neutron importance region. The inner wall chamber allows at least a portion of the nuclear fuel to move in a molten fuel state to a lower neutron importance region while the molten nuclear fuel remains within the inner wall chamber as the temperature of the nuclear fuel satisfies a negative reactivity feedback expansion temperature condition. A duct contains the multiple-walled fuel chamber and flows a heat conducting fluid through the duct and in thermal communication with the outer wall chamber.

    DOPPLER REACTIVITY AUGMENTATION DEVICE
    36.
    发明申请
    DOPPLER REACTIVITY AUGMENTATION DEVICE 有权

    公开(公告)号：US20210313080A1

    公开(公告)日：2021-10-07

    申请号：US17151012

    申请日：2021-01-15

    申请人： TerraPower, LLC

    发明人： Jesse R. Cheatham, III ,  Mark W. Reed ,  Micah J. Hackett

    IPC分类号： G21C7/06 ,  G21C1/02 ,  G21C7/08 ,  G21C7/02

    摘要： A fast neutron nuclear reactor contains a nuclear reactor core having an array of device locations. Some device locations in the nuclear reactor core contain fissile and fertile nuclear fuel assembly devices. One or more other device locations in the nuclear reactor core contain Doppler reactivity augmentation devices that amplify the negativity of the Doppler reactivity coefficient within the nuclear reactor core. In some implementations, a Doppler reactivity augmentation device can also reduce the coolant temperature coefficient within the nuclear reactor core. Accordingly, a Doppler reactivity augmentation device contributes to a more stable nuclear reactor core.

    Temperature actuated shutdown assembly for a nuclear reactor
    39.
    发明授权
    Temperature actuated shutdown assembly for a nuclear reactor 失效
    用于核反应堆的温度启动关闭组件

    公开(公告)号：US3976543A

    公开(公告)日：1976-08-24

    申请号：US631969

    申请日：1975-11-14

    申请人： Edmund S. Sowa

    发明人： Edmund S. Sowa

    IPC分类号： G21C9/027 ,  G21C7/02

    CPC分类号： G21C9/027 ,  Y02E30/40

    摘要： Three identical bimetallic disks, each shaped as a spherical cap with its convex side composed of a layer of metal such as molybdenum and its concave side composed of a metal of a relatively higher coefficient of thermal expansion such as stainless steel, are retained within flanges attached to three sides of an inner hexagonal tube containing a neutron absorber to be inserted into a nuclear reactor core. Each disk holds a metal ball against its normally convex side so that the ball projects partially through a hole in the tube located concentrically with the center of each disk; at a predetermined temperature an imbalance of thermally induced stresses in at least one of the disks will cause its convex side to become concave and its concave side to become convex, thus pulling the ball from the hole in which it is located. The absorber has a conical bottom supported by the three balls and is small enough in relation to the internal dimensions of the tube to allow it to slip toward the removed ball or balls, thus clearing the unremoved balls or ball so that it will fall into the reactor core.

    摘要翻译： 三个相同的双金属盘，其形状为球形盖，其凸面由诸如钼的金属层组成，并且由诸如不锈钢的相对较高的热膨胀系数的金属组成的凹面保持在附接的凸缘中 到包含插入核反应堆芯的中子吸收器的内六角管的三侧。 每个盘保持金属球抵靠其正常的凸面，使得球部分地穿过管中与每个盘的中心同心的孔; 在预定温度下，至少一个盘中的热诱导应力的不平衡将导致其凸侧变成凹形，并且其凹面变得凸起，从而将球从其所在的孔拉出。 吸收器具有由三个球支撑的锥形底部，并且相对于管的内部尺寸足够小，以允许其滑向移除的球或球，从而清除未被移动的球或球，使得其将落入 反应堆核心。