| 摘要 |
1,080,831. Reactor control rods. SOCIETE ANGLO-BELGE VULCAIN S.A. Dec. 14, 1964 [Jan. 17, 1964], No. 2264/64. Heading G6C. A control rod and drive mechanism includes a fluid-operated piston and cylinder to drive the absorber element; a stationary piston is mounted on a stationary hollow piston-rod, the working fluid being supplied to the movable cylinder through the piston-red; a pilot ;piston is movably mounted in the piston-rod and, under the action of working fluid pressure, closes a relief valve to which it is linked, the relief valve being -located in the fixed piston, and biased to an open position. The control rod is for use in a pressurized water reactor and uses water as its operating fluid; it may be used for both normal control and emergency shutdown. The movable cylinder 12 is attached to the coaxial absorbing tube 11 which is stainless steel sheathed boron. A spring 13 always acts in opposition to the fluid pressure to urge the control element downwards. The drawing shows the mechanism in a withdrawn position. Fluid pressure applied -to the pilot piston 25 forces it open against the action of spring 27 and at the same time shuts the relief valve 21. The neutron absorbing element is returned by cutting off the fluid pressure supply, fluid in the cylinder being exhausted through the -thus opened valve aperture 22 between the arms 23 in the fixed piston 17. The embodiment described may be modified by using the neutron absorbing member directly as the movable cylinder, and provision can be made for maintaining the absorbing member in steady intermediate positions.
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