DESIGN AND TEST ANALYSIS OF THE MAGNETIC JACKING POSITIVE LATCH CONTROL ROD DRIVE MECHANISM
Testing of the Latch Type Magnetic Jack Control Rod Drive Mechanism was undertaken to determine its feasibility for application in the Yankee Atomic Electric pressurized water reactor. The rod drive mechanism, which will be weld mounted to the top of the reactor, is a hermetically sealed unit. The inherent advantages of this feature include (1) uniform pressure over the length of the control rod allowing for more reliable scramraing and (2) the absence of high- pressure shaft seals. The latch-type mechanism is capable of functioning under greater loads since support of the weight depends on magnetically actuated latches engaging a grooved drive shaft rather than a frictional force between metal surfaces in contact. Design calculations describe this facet of the mechanism along with other pertinent mechanical and electrical features. Another advantage of the latch type mechanism which lends itself to more accurate control is the parity of distance traveled up to distance traveled down for a given number of steps. In the case of a friction grip mechanism, downward travel could exceed upward travel for the same number of steps in each direction due to slippage between metal surfaces. Tests performed on the latch type mechanism varied in nature from the determination of load carrying capacity to an evaluation of the operational reliability when an excessive amount of crud was present in the mechanism environment. Heat transfer tests were conducted on a positive grip type control-rod drive mechanism to determine the air cooling required to prevent exceeding the maximum allowable coil temperature of 450 ction prod- F. Based on the tests, an air flow rate of 9650 CFM was recommended for the 24 control rod drive mechanisms. (auth)
- Research Organization:
- Westinghouse Electric Corp. Atomic Power Dept., Pittsburgh
- DOE Contract Number:
- AT(30-3)-222, SUB-CONTRACT NO. 1
- NSA Number:
- NSA-14-010212
- OSTI ID:
- 4184459
- Report Number(s):
- YAEC-155
- Resource Relation:
- Other Information: For Yankee Atomic Electric Co. Orig. Receipt Date: 31-DEC-60
- Country of Publication:
- United States
- Language:
- English
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