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    Uranium-containing nuclear-fuel sintered pellet
    1.
    发明授权
    Uranium-containing nuclear-fuel sintered pellet 失效
    含铀核燃料烧结球团

    公开(公告)号：US5642390A

    公开(公告)日：1997-06-24

    申请号：US599386

    申请日：1996-02-09

    申请人： Harald Cura ,  Martin Peehs ,  Gerhard Gradel ,  Alfons Roppelt ,  Erhard Ortlieb ,  Richard A. Perkins

    发明人： Harald Cura ,  Martin Peehs ,  Gerhard Gradel ,  Alfons Roppelt ,  Erhard Ortlieb ,  Richard A. Perkins

    IPC分类号： C04B35/00 ,  G21C3/62 ,  G21C21/02

    CPC分类号： G21C3/623 ,  Y02E30/38

    摘要： A uranium-containing nuclear-fuel sintered pellet containing UO.sub.2, (U, Pu)O.sub.2, (U, Th)O.sub.2, (U, RE)O.sub.2, (U, Pu, Th)O.sub.2, (U, Pu, RE)O.sub.2, (U, Th, RE)O.sub.2 or (U, Pu, Th, RE)O.sub.2, wherein RE=rare earth, has a sintered-pellet surface layer being formed of at least 80% by volume of a chemical boron compound UB.sub.x or (U, . . . )B.sub.x, wherein x=2;4;6 or 12, and a remainder of the sintered pellet containing at most 5% by volume of the chemical boron compound. A nuclear-reactor fuel assembly has a fuel rod containing such a uranium-containing nuclear-fuel sintered pellet in a cladding tube with the boron as a burnable absorber for thermal neutrons. The surface layer having the chemical boron compound is obtained by treating the nuclear-fuel sintered pellet with boron or a boron-containing chemical compound at an appropriately high treatment temperature.

    摘要翻译： 含有UO2，（U，Pu）O2，（U，Th）O2，（U，RE）O2，（U，Pu，Th）O2，（U，Pu，RE）O2的含铀核燃料烧结颗粒 ，（U，Th，RE）O 2或（U，Pu，Th，RE）O 2，其中RE =稀土，具有烧结颗粒表面层，其由至少80体积％的化学硼化合物UBx或 （U，...）Bx，其中x = 2; 4; 6或12，剩余的烧结颗粒含有至多5体积％的化学硼化合物。 核反应堆燃料组件具有在包覆管中含有这种含铀的核燃料烧结颗粒的燃料棒，其中硼作为热中子的可燃性吸收剂。 具有化学硼化合物的表面层通过在适当高的处理温度下用硼或含硼化合物处理核燃料烧结颗粒而获得。