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    • 4. 发明专利
    • FUEL ASSEMBLY
    • JPH0829568A
    • 1996-02-02
    • JP16770094
    • 1994-07-20
    • HITACHI LTDHITACHI ENG CO LTD
    • KONUKI NORIHIKOIMAI MASABUMINAKAJIMA JUNJIROYASUJIMA MASAKICHIIZUTSU SADAYUKI
    • G21C3/18G21C3/326
    • PURPOSE:To reduce the inner pressure of fuel rod while avoiding contact of a plenum spring with the outer circumferential part of fuel pellet and the inner surface of fuel cladding tube by eliminating a wafer at the upper part of the fuel pellet and bringing the plenum sprung into contact with the top face of the fuel pellet thereby increasing the spatial volume at the plenum part. CONSTITUTION:A plenum spring 9 is tapered conically at one end thereof on the side touching a fuel pellet 7 in order to prevent the spring 9 from touching the outer circumference of the pellet 7 and crackling. Furthermore, the most forward end part of the spring 9 is prevented from touching the inner ace of a fuel cladding tube 10 thus ensuring the mechanical soundness thereof. In this regard, an upper end plug 11 and the end part touching the pellet 7 are ground horizontally to increase the contact area thus enhancing the heat transmission performance and the mechanical soundness. Furthermore, the spring 9 on the pellet 7 side employs a tight contact structure of 4-12mm long forming a hollow tubular solid thus enhancing thermal neutron absorption of short fuel rod and reducing the output spike (output at the upper end of short fuel rod increases).
    • 6. 发明专利
    • Oscillation-packing type atomic reactor fuel rod
    • 振动包装型原子反应堆燃料油
    • JP2004101199A
    • 2004-04-02
    • JP2002259237
    • 2002-09-04
    • Hitachi LtdJapan Nuclear Cycle Development Inst States Of Projects株式会社日立製作所核燃料サイクル開発機構
    • SUZUKI MASAHIROISHII KATSUNORIHINAI HIROSHISHIGETOME YOSHIAKIKONO SHUSAKUSASAHIRA AKIRAKONUKI NORIHIKO
    • G21C3/26G21C3/62G21C21/04
    • Y02E30/34Y02E30/38
    • PROBLEM TO BE SOLVED: To reduce the kinds of fuel particles, to enhance the filling ratio, to improve a yield, and to reduce a manufacturing cost.
      SOLUTION: The atomic reactor fuel rod forms a fuel area 16 of a predetermined fuel density by loading fuel particles in a cladding tube 10, and applying oscillation thereto, and seals both ends of the cladding tube by end plugs 18 and 20. The fuel particles loaded in the cladding tube consist of spherical fuel particles and monolithic lump-shaped fuel particles. The grain size of the spherical fuel particles is larger than the grain size of the monolithic lump-shaped fuel particles, and both kinds of fuel particles are mixed in a substantially uniform manner. For example, there are two kinds, i.e., spherical fuel particles 30 of large grain size and monolithic lump-shaped fuel particles 34 of small grain size. The grain size of spherical fuel particles is 700-1,000 μm, and the grain size of monolithic lump-shaped fuel particles is ≤100 μm, and the charging ratio of spherical fuel particles is 50-70 wt.%.
      COPYRIGHT: (C)2004,JPO
    • 要解决的问题:为了降低燃料粒子的种类,提高填充率,提高收率,降低制造成本。 解决方案:原子反应堆燃料棒通过在包壳管10中加载燃料颗粒并施加振动而形成具有预定燃料密度的燃料区域16,并通过端塞18和20密封包层管的两端。 装载在包层管中的燃料颗粒由球形燃料颗粒和整体块状燃料颗粒组成。 球形燃料颗粒的粒度大于单块块状燃料颗粒的粒径,并且两种燃料颗粒以基本均匀的方式混合。 例如,具有大粒径的球形燃料粒子30和小粒径的整体块状燃料粒子34有两种。 球形燃料颗粒的粒径为700-1,000μm,单块块状燃料颗粒的粒径≤100μm,球形燃料颗粒的装料率为50-70wt%。 版权所有(C)2004,JPO