IMPROVEMENTS IN OR RELATING TO CONTROL SYSTEMS FOR NUCLEAR REACTORS
Combined control and shut-off red by Reyrolle, a member of the Nuclear Power Plant Company, is suspended by a flexible chain or cable from a windlass drum, mounted on the horizontal spindle of a reduction gearbox which is driven by a variable speed electric motor with no clutch between the rod and the motor. A second gearbox connects the other end of the motor shaft to an electromagnetic induction brake. For emergency shut-down, the motor is de-energized and the red allowed to fall, under gravity but controlled by the brake. The inertia of the driving train constituted by the motor, gearing and moving parts is sufficiently low for it to fall rapidly enough while remaining coupled to the motor, driving the de-energized motor in reverse through the gearing. Final deceleration is produced by the brake whose torque is automatically raised with the red's position by means of the variable-ratio gearbox. Absence of clutch is claimed to lead to great reliabllity.
- Research Organization:
- Originating Research Org. not identified
- NSA Number:
- NSA-13-008478
- OSTI ID:
- 4273445
- Journal Information:
- Nuclear Power, Journal Name: Nuclear Power Vol. 4; ISSN 0546-8981; ISSN NUPOAS
- Country of Publication:
- United Kingdom
- Language:
- English
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IMPROVEMENTS IN AND RELATING TO NUCLEAR REACTORS
Method of decelerating a power shift transmission