Feedwater control in a PWR following reactor trip

Details Feedwater control in a PWR following reactor trip Feedwater control in a PWR following reactor trip

1986-09-29

1988-04-19

Kyle, Deborah L.

Induced nuclear reactions: processes, systems, and elements

With control of reactor

By coolant flow

376216, 606441, 60667, G21C 732

Patent

active

047388188

ABSTRACT:
Excessive primary cooldown and start up of the auxiliary feedwater system in a pressurized water reactor (PWR) following a reactor trip are avoided by switching to primary coolant T.sub.avg programmed, main feedwater flow control in place of normal level programmed control. The Low T.sub.avg set point at which the main feedwater isolation valves are closed is lowered below the no load T.sub.avg temperature set point and the flow rate is decreased gradually to zero at a T.sub.avg between these two set points. In addition, the low-low level set point at which the auxiliary feedwater system is started is lowered if possible, and/or the level signal is filtered, or the start signal delayed, to increase the margin to the low-low set point.

REFERENCES:
patent: 3255084 (1966-06-01), Doroszlai
patent: 3930937 (1976-01-01), Torres
patent: 4104117 (1978-08-01), Parziale et al.
patent: 4424186 (1984-01-01), Cook
Hocepied et al., "Automatic Control of the Water Level of Steam Generators from 0% to 100% of the Load", Nuclear Energy, vol. 17, No. 2, 1978, pp. 133-142.

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