Thermal Stratification in Steam Generator Feedwater Lines

[+] Author and Article Information
R. Braschel

IfB mbH, Stuttgart, West Germany

M. Miksch, G. Schücktanz

Kraftwerk Union AG, Erlangen, West Germany

J. Pressure Vessel Technol 106(1), 78-85 (Feb 01, 1984) (8 pages) doi:10.1115/1.3264312 History: Received November 05, 1982; Revised November 28, 1983; Online November 05, 2009


In recent years cracks have been found in the inlet nozzles of feedwater lines of steam generators. These cracks occur as a result of material fatigue. Thermal stratification in the feedwater is probably one of the factors primarily responsible for the fatigue. This paper describes methods of calculating the stress intensity ranges occurring as a result of the stratification. In addition, a design modification (a diversion tank) is proposed which effectively prevents the occurrence of this load case.

Copyright © 1984 by ASME
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