| 摘要 |
The invention relates to a fixture for inserting locking tubes into control-rod guide-thimble extensions positioned in passageways through the adapter plate of a top nozzle of a reconstitutable nuclear-fuel assembly. …<??>The fixture comprises a tool guide (54), and an insertion tool (98, 102). The tool guide (54) is adapted to be mounted upon, and to be releasably locked to, the top nozzle (20) and it has guide openings (68) arrayed such as to be axially aligned with the respective guide-thimble extensions (46) when the tool guide is in place, each of the guide openings (68) contaioning a resiliently deformable sleeve (72) for receiving and releasably retaining a locking tube (48). The insertion tool includes a plurality of rods (102) which are insertable through the respective guide openings (68) and into the guide-thimble extensions (46) aligned therewith, each rod having a leading portion (106) which is movable through and into the associated guide-opening and guide-thimble extension, respectively, and a trailing portion (104) which defines a shoulder (108) for transferring the locking tube (48) from the sleeve (72) into the aligned guide-thimble extension (46) upon operation of the insertion tool. …<??>The fixture permits a full complement of locking tubes to be inserted simultaneously while the resiliently deformable sleeves prevent escape and loss of the locking tubes. |
