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    NUCLEAR FUEL ASSEMBLY HAVING A TRANSITION PIECE WITH REDUCED FLOW RESISTANCE
    9.
    发明申请
    NUCLEAR FUEL ASSEMBLY HAVING A TRANSITION PIECE WITH REDUCED FLOW RESISTANCE 审中-公开
    具有降低流动阻力的过渡段的核燃料组件

    公开(公告)号：WO1997028535A1

    公开(公告)日：1997-08-07

    申请号：PCT/US1996001275

    申请日：1996-02-02

    Applicant: SIEMENS AKTIENGESELLSCHAFT ,  BARKHURST, David, J. ,  DRECKER, Stefan ,  MENGES, Dieter ,  MEIER, Werner ,  ALTER, Dietrich ,  EMMERT, Knut

    Inventor： SIEMENS AKTIENGESELLSCHAFT

    IPC: G21C03/322

    CPC classification number: G21C5/06 ,  G21C3/322 ,  G21Y2002/201 ,  G21Y2002/304 ,  G21Y2004/302 ,  Y02E30/31 ,  Y02E30/38

    Abstract: In order to reduce the flow resistance of a coolant flowing through a passage (63) in the support plate (64) of a boiling water reactor and entering the transition piece (50) at the lower end of a fuel assembly resting on said support plate (64), the lower rim (60) of the transition piece (50) forms a conically tapered surface which fits into a corresponding conical counter-surface (62) at the upper edge of said passage (63). The lower rim (60) of the transition piece (50) forms a circular inlet which is concentric with the passage (63) and has a size equal or slightly larger than the passage opening. Fingers (70) protruding laterally into said opening and extending down into said passage (63) are used to center the low rim (60) within the passage (63). Additionally, the end caps (90) of the fuel rods may be stream-lined and the lower tie plate (53) of the fuel assembly may be spaced apart from the inner surface of a fuel channel (52) by a plurality of ribs (86) which form a plurality of peripheral through holes (86') on each of the four inner surfaces (84) of the rectangular fuel channel (52).

    Abstract translation: 为了降低流过沸水反应堆的支撑板（64）中的通道（63）的冷却剂的流动阻力，并进入位于所述支撑板上的燃料组件的下端的过渡件（50） （64）中，过渡件（50）的下边缘（60）形成锥形锥形表面，该锥形表面装配在所述通道（63）的上边缘处的对应锥形对置表面（62）中。 过渡件（50）的下边缘（60）形成与通道（63）同心的圆形入口，其尺寸等于或稍大于通道开口。 用于将侧边突出到所述开口并向下延伸到所述通道（63）中的手指70将所述低边缘（60）定位在所述通道（63）内。 另外，燃料棒的端盖（90）可以是流线型的，并且燃料组件的下连接板（53）可以通过多个肋（...）与燃料通道（52）的内表面间隔开 86），其在矩形燃料通道（52）的四个内表面（84）中的每一个上形成多个周边通孔（86'）。

    FUEL ELEMENT WITH A SHORTENED SUPPORTING COOLANT PIPE
    10.
    发明申请
    FUEL ELEMENT WITH A SHORTENED SUPPORTING COOLANT PIPE 审中-公开
    燃料元件与缩短支冷却管

    公开(公告)号：WO1995008826A1

    公开(公告)日：1995-03-30

    申请号：PCT/DE1994001046

    申请日：1994-09-13

    Applicant: SIEMENS AKTIENGESELLSCHAFT ,  MEIER, Werner

    Inventor： SIEMENS AKTIENGESELLSCHAFT

    IPC: G21C03/322

    CPC classification number: G21C3/322 ,  G21C2003/3225 ,  G21Y2002/201 ,  G21Y2002/207 ,  G21Y2004/302 ,  Y02E30/38

    Abstract: In a boiling-water fuel element with a central coolant pipe (WR) as the backbone of the bearing frame, upper end section (WE) of the coolant pipe (WR) becomes a relatively slim linking stud (4) engaging through an aperture in the upper rod holder (1) and secured there. Thus the upper end section (WE) lies at the upper edge of the active zone (AZ) and the coolant outlets of the coolant pipe (WR) take the form of passages (8) which are axial or run inwards to the linking stud. This provides good flow conditions, especially low pressure losses, in the upper part of the fuel element.

    Abstract translation: 与中央冷却剂配管（WR）作为支持骨架的主链中的沸水燃料组件是在一个相对细长的销（4），其通过上杆保持器的开口啮合其上端（WE）的冷却剂管（WR）（1） 并附着在那里。 上端（WE）位于有源区（AZ）和冷却剂配管（WR）的冷却剂出口的上边缘是轴向或向内朝向（8）形成在所述插件定位销通道的通道。 这将创造有利的流动条件下，特别是压力损失小，达到了燃料组件的顶部。

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