IMPROVEMENTS IN AND RELATING TO NUCLEAR REACTORS
A mechanism for varying the position of a control element in a reactor core is designed consisting of a drum, a cable for suspending the control element from the drum, and a driving motor. The drum is designed to wind the cable in layers so that the radius of the torque exerted by the drum on the cable decreases as the cable is unwound. The motor is of the a-c synchronous type and has a freewheel device so that winding and unwinding of the cable is accomplished by the motor and the weight of the cable, respectively, with the motor acting as a brake in the latter case. The speed and torque of the motor are changed by varying the frequency of its supply source. One of the three guide sheaves is so arranged that, near the end of the unwinding of the cable, it absorbs the kinetic energy of the cable. Thus, when the control element needs to be inserted rapidly into the core, as in shutdown, its descent is controlled by the inertia of the winding mechanism, the brsking torque of the motor, the decreasing radius of the torque of the cable on the drum, and the absorption of kinetic energy by the guide sheave near the end of the descent. (D.L.C.)
- Research Organization:
- Originating Research Org. not identified
- NSA Number:
- NSA-15-010441
- OSTI ID:
- 4095211
- Report Number(s):
- GB 859811
- Country of Publication:
- United Kingdom
- Language:
- English
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IMPROVEMENTS IN AND RELATING TO NUCLEAR REACTOR CONTROL ROD WINDING MECHANISMS