公开(公告)号：US4933137A

公开(公告)日：1990-06-12

申请号：US192176

申请日：1988-05-10

申请人： Kazuo Murakami ,  Kyoichi Yoshigai ,  Katsutoshi Yamamoto

发明人： Kazuo Murakami ,  Kyoichi Yoshigai ,  Katsutoshi Yamamoto

IPC分类号： G21C3/326 ,  G21C3/32 ,  G21C17/108

CPC分类号： G21C3/32 ,  G21C17/108 ,  Y02E30/40

摘要： An nuclear fuel assembly including an instrumentation tube adapted for insertion of an in-core detector tube and at least two equi-angularly disposed springs for holding the in-core detector tube concentrically within the instrumentation tube to prevent detector tube vibration is related herein. The springs are preferably secured to the inner surface of the instrumentation tube immediately above the bottom nozzle. An extension sleeve may be provided which extends upwardly or downwardly from the bottom nozzle to surroundingly receive the in-core detector tube. This will effectively increase the axial length of the in-core detector tube that is likely to abut the inner surface of the extension sleeve thus rendering the in-core dectector tube less susceptible to wear due to reactor coolant flow induced vibration.

摘要翻译： 一种核燃料组件，其包括适于插入核心探测器管的仪表管和至少两个等角度设置的弹簧，用于将芯体内探测器同心地保持在仪表管内以防止检测器管振动。 弹簧优选紧固在底部喷嘴正上方的仪表管的内表面上。 可以设置延伸套筒，其从底部喷嘴向上或向下延伸以周围地容纳芯内检测器管。 这将有效地增加可能邻接延伸套筒的内表面的芯内检测器管的轴向长度，从而使核心检查管不易于由于反应堆冷却剂流引起的振动而磨损。