Automatic steam generator feedwater realignment system

Details Automatic steam generator feedwater realignment system Automatic steam generator feedwater realignment system

1978-07-18

1980-11-04

Sprague, Kenneth W.

Liquid heaters and vaporizers

Safety devices

Fire extinguishers

122 32, 122406R, F22B 106, F22B 3742

Patent

active

042313287

ABSTRACT:
A method of automatically realigning a steam generator secondary piping system, such as the feedwater system, in the event of a pipe break to a given steam generator in a system having plural steam generators sharing, in part, a common secondary piping system. A feedwater line break is identified by monitoring the respective generators' steam exit line pressures and comparing the several pressures to a first predetermined setpoint. If any one of the several monitored pressures falls below the first setpoint the main steam line isolation valves are automatically closed and the respective generator pressures are again monitored and compared to a second predetermined setpoint. The feedwater line to the generator then exhibiting a drop in pressure below the second setpoint is isolated and the remaining generator main steam line isolation valves may be opened to return the functional intact generators to the system.

REFERENCES:
patent: 3033538 (1962-05-01), Iddles et al.
patent: 3114414 (1963-12-01), Judd
patent: 3941187 (1976-03-01), Jabsen et al.
patent: 4050418 (1977-09-01), Watanabe

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