| 摘要 |
<p>The invention relates to a positioning mechanism for positioning an invididual neutron-source rod in a guide thimble which is part of a nuclear fuel assembly and is axially aligned with a coolant flow opening through the upper reactor core plate overlying the fuel assembly. …<??>The positioning mechanism (30) has a tapered locating boss (36) which is seated in a socket (34) formed in the lower side of the core plate (12) about said coolant flow opening (24), and resilient holddown means (44, 56, 66) which resiliently connect the upper end (42) of the neutron-source rod to the locating boss in a manner such as to restrain the upper end of the rod in the lateral direction and position the rod in the axial direction.</p> |
