| 摘要 |
The invention relates to a device for gripping and detaching a top nozzle subassembly of a reconstitutable nuclear fuel assembly from upper guide-thimble extensions. …<??>The device has a central spider (64) with radial spokes (78) each carrying a locating lug (66) insertable into a coolant-flow opening of the hold-down plate of the top nozzle subassembly, a collar (68) adapted to seat against the top surface of the hold-down plate, and a spring compressing rod (70) extending through openings in the lug and collar and threadedly engageable with the adapter plate of the top nozzle subassembly. …<??>When in use, the rods (70) first are rotated to depress the hold-down plate and, hence, the hold-down springs, thereby to relieve tension on the guide-thimble extensions. Then, the latter are cut, whereafter the rods (70) are rotated in the opposite direction, thereby enabling the hold-down springs to push the hold-down plate upwards and off the cut ends of the guide-thimble extensions. An anvil (100) and impact slide (98) serve to force release of the hold-down plate from the cut extensions, if necessary. |
