CONTROL ROD DRIVE
A control rod drive includes an unbalanced movable element connected to the control rod, a two-phase electric motor, and gearing connecting the motor and the element for moving the element to a selected rest position. The motor has its phases normally adjusted so as to produce in the rest position a minor amount of torque sufficient to neutralize the torque applied to the motor through the gearing by the unbalanced weight connected to the element. A lifting electromagnet is mounted on the lower end of the element in order to hold an armature for the magnet, this armature being connected with the control rod by a connecting rod and sliding within a cylindrical casing, the connecting rod passing through a gland at the bottom of the cylindrical casing extending below the normal level of the fluid in the reactor. On the connecting rod a piston is mounted which slides with a sealing ring in the bore of the cylindrical casing, so that when the lifting magnet is deenergized, the control rod falls in the reactor. This cylindrical casing is provided near its bottom with lateral openings forming throttle means for the liquid and serving as a controlling means to reduce the rate of descent of the control rod as the piston approaches the bottom of the cylindrical casing. The connecting rod is long enough so that in its lowest position the armature will remain above the normal fluid level. (NPO)
- Research Organization:
- Originating Research Org. not identified
- NSA Number:
- NSA-16-034050
- OSTI ID:
- 4776783
- Report Number(s):
- FR 1272954
- Country of Publication:
- France
- Language:
- English
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