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Hydraulic mechanism for actuating the neutron absorbing rods in nuclear reactors and nuclear core nuclear reactor with such a mechanism.
Hydraulic mechanism for actuating the neutron absorbing rods in nuclear reactors and nuclear core nuclear reactor with such a mechanism.
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机译:用这种机构来致动核反应堆和核芯核反应堆中的中子吸收棒的液压机构。
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摘要
1,119,858. Controlling reactors. ATOMENERGI A.B. 13 Oct., 1965 [15 Oct., 1964], No. 43463/65. Heading G6C. A device for operating a neutron-absorbing rod in a nuclear reactor comprises a slide 3 either supporting a neutron-absorbing rod or itself constituting the rod and axially movable in a cylinder 1 above the reactor core 37, the upper portion of the slide 3 being formed as a plunger 5, and means for supplying a pres. surized fluid to the space 23 defined by the cylinder 1, the slide 3 and the plunger 5 for holding the slide 3 in its upper position. The cylinder 1 and/or the slide 3 has at least one recessed portion along its entire operative length forming a channel through which the pressurized fluid leaves the space when the slide 3 leaves its upper position after the supply of pressurized fluid has been cut off, to the effect that the neutron-absorbing rod falls into the core 37 by its own weight and relatively freely. A water-cooled nuclear reactor containing such a device comprises a tank 35 housing the core 37 and a handling machine with a central stem 39 for removing used fuel from and inserting new fuel into the core 37. The lower portion of the cylinder 1 is situated below the water level 51 in the tank 35. An hydraulic pressure is maintained in the space 23 by a pump 47 in a conduit 25, 29 which has its lower end connected to the bottom of the tank 35 and contains a 3-way magnetic valve 27. The space 23 may be connected to the bottom of the tank 35 through a by-pass conduit 33, whereupon the pressure in the space 23 falls and the slide 3 begins to move downwards by its own weight. As soon as a seal ring 7 which is provided in an annular groove in the plunger 5 (as shown in Fig. 2) comes out of engagement with a raised seal surface 11 on the inner wall of the cylinder 1, the water in the space 23 flows upward through the annular space 6 between the plunger 5 and the cylinder 1 and the slide 3 can move much faster. Its downward movement is limited by the lower surface of the plunger 5 coming into contact with a flange 13 on the end of the cylinder 1. A spring (not shown) may be provided around the slide 3 to be compressed between the plunger 5 and the flange 13. Three axially extending grooves 15 are provided on the inner surface of the flange 13 and the pressurized water in the space 23, when the slide 3 is in its uppermost position, flows from the space 23 through the channels formed between a seal ring 17 in the slide 3 and the grooves 15. Along its entire operative length the inner wall of the cylinder 1 has an annular portion 21 recessed in relation to the seal surface 11. In another embodiment (Fig. 3, not shown), the cylinder 1 has no recessed portion but the slide 3 has on its outer wall an annular recessed portion (49), while in a further embodiment (Figs. 4 and 5, not shown), there are recessed portions consisting of longitudinal grooves (21a, 49a) on both the cylinder 1 and the slide 3. The central stem 39 of the handling machine can be turned in any direction and arms 55 carry a vertical member 53 which supports a telescopic lifting member 57. This can be raised and lowered by means of a wire 59 operated by a drum 60. The lifting member 57 carries a grip member 61 which can be lowered through the cylinder 1 to lift the slide 3 back from the bottom of the cylinder 1 to its uppermost position. The top of the slide 3 has an internal flange 10 by means of which the slide can be seized by the grip member 61 to be lifted by the lifting member 57.
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