Method and apparatus for detecting flow instability in steam gen

Details Method and apparatus for detecting flow instability in steam gen Method and apparatus for detecting flow instability in steam gen

1980-02-27

1981-10-06

Caldwell, Sr., John W.

Communications: electrical

Condition responsive indicating system

Specific condition

122452, 165 11R, 376246, G08B 2100

Patent

active

042938538

ABSTRACT:
A method for detecting the flow instability in steam generators is provided. First, a number of limit values on the differential pressure between the water-side inlet and outlet of the steam generator are determined at different feedwater flow rates. The limit values define the onset of the flow instability. By connecting the thus determined limit values, a boundary line defining the occurrence of the flow instability is obtained. Second, it is checked whether the measured differential pressure between the inlet and outlet at an actual feedwater flow rate is above or below the boundary line so as to determine if the flow instability has occurred or not in the steam generator. An apparatus for accomplishing the method is also provided.

REFERENCES:
patent: 2322975 (1943-06-01), Schroeder
patent: 2323013 (1943-06-01), Decker
patent: 2375431 (1945-05-01), Mastenbrook et al.
patent: 3061533 (1962-10-01), Shannon et al.
patent: 3247069 (1966-04-01), Powell et al.
patent: 3275524 (1966-09-01), Williams
patent: 3332849 (1967-07-01), Kagi
patent: 3791922 (1974-02-01), Musick
patent: 3930937 (1976-01-01), Torres
"Flow Instability Detection in a Sodium-Heated Steam Generator by Noise Analysis" by Tamaski et al., Nuclear Power Plant Control and Instrumentation, vol. 1, pp. 317-329 (Apr. 1978).

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