| 摘要 |
1,163,641. Devices for lifting nuclear fuel elements. COMPAGNIE GENERALE D'AUTOMATISME. 6 June, 1967 [6 June, 1966], No. 26146/67. Heading B8H. [Also in Division G6] When a handling device for nuclear fuel elements is being lowered by a cable attached to a ring 18, Fig. 2, a shuttle 16 to which the ring is attached is in its upper position and an aperture 21 is opposite a tube 20, thus putting a pneumatic chamber, formed by concentric bellows 4, 5, in contact with the atmosphere. Grippers 8 are held in inoperative position by a flange 25 of the shuttle 16, and measurement of the flow rate in a conduit 3 shows that the suspension cable is under tension. When a ring 14 abuts an element further descent of the ring and a piston 13 is prevented. Subsequently the grippers abut the ring and are immobilized and with them the body 7. The shuttle 16 continues to descend until the ring 18 abuts the cover 17, which is signalled by the fall in flow rate in a conduit 12 due to movement of the piston 13. The flange 25 is now clear of the grippers 8 and inflation of the pneumatic chamber 4, 5 forces the body 7 down and pushes the grippers inwards on pivots 9 by means of pins 10. This allows the grippers to move inside the ring 14 and descend until a casing 11 abuts the ring. Supply to the pneumatic chamber is discontinued and a bell member 1 moves down pushing the grippers outwards to engage the fuel element. The device may now be lifted and in so doing the shuttle 16 moves up to machanically lock the grippers and re-connect the orifice 21 to the conduit 20. Whilst the element is held, flow in the conduit 12 should be nil. The temperature of the reactor gas can be measured by a thermocouple 22. |
