Feedwater control over full power range for pressurized water re

Details Feedwater control over full power range for pressurized water re Feedwater control over full power range for pressurized water re

1998-10-22

2000-02-01

Jordan, Charles T.

Induced nuclear reactions: processes, systems, and elements

With control of reactor

By coolant flow

376210, 376216, 376241, 376402, G21C 732, G21C 736, G21C 700

Patent

active

060211695

ABSTRACT:
A feedwater control system and method for a pressurized water reactor steam generating system having first and second output signals. The first output signal is determined by first and second input signals, and, when combined with a third input signal automatically controls at least one feedwater pump and first designated valves which regulate water flow from the one or more feedwater pumps to a steam generator when a steam generator steam load and reactor are operating at a first predetermined power level. The first input signal is determined by a downcomer feedwater flow differential pressure. The second input signal is determined by a reactor power level. The third input signal is determined by a steam generator level. The second output signal, determined by a steam generator water level, automatically controls at least one startup feedwater control valve when the steam generator steam load and the reactor are operating at a second predetermined power level. In a preferred embodiment, the first designated valves include at least one economizer feedwater control valve and at least one downcomer feedwater control valve. Also, in a preferred embodiment, the first predetermined power level is between about 5 and about 20 percent, and the second predetermined power level is between zero and about 5 percent.

REFERENCES:
patent: 4104117 (1978-08-01), Parziale et al.
patent: 4728481 (1988-03-01), Geets
patent: 4777009 (1988-10-01), Singh et al.

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