F - Mech Eng,Light,Heat,Weapons – 22 – D
Patent
F - Mech Eng,Light,Heat,Weapons
22
D
122/31, 60/46
F22D 7/12 (2006.01) F22B 35/00 (2006.01) F22D 5/26 (2006.01)
Patent
CA 1191400
ABSTRACT OF THE DISCLOSURE Excessive swing of the feedwater in power supply apparatus on the occurrence of a transient is suppressed by injecting an anticipatory compensating signal into the control for the feedwater. Typical overshoot occurs on removal of a large part of the load, the steam flow is reduced so that the conventional control system reduces the flow of feedwater. At the same time there is a reduc- tion of feedwater level in the steam generator because of the collapse of the bubbles under increased steam pres- sure. By the time the control responds to the drop in level, the apparatus has begun to stabilize so that there is overshoot. The anticipatory signal is derived from the boiling power which is a function of the nuclear power developed, the enthalpy of saturated water and the en- thalpy of the feedwater injected into the steam generator. From the boiling power and the increment in steam pressure resulting from the transient are anticipatory increment of feedwater flow is derived. Thus increment is added to the other parameters controlling the feedwater.
395972
Oldham And Company
Westinghouse Electric Corporation
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