SYMPOSIA PAPER Published: 01 January 1997

Advances in Environmental Fatigue Evaluation for Light Water Reactor Components


The recently acquired fatigue test data have indicated that the low cycle fatigue lives attained in light water reactor environments can be markedly shorter than those determined in the ambient atmospheric air. Of the various factors that are known to exert influence on the fatigue life, the present authors have noted strain rate, temperature, and dissolved oxygen (DO) content, and proposed a method of evaluating the environmental fatigue lives for the Class 1 vessels when they vary with time. In this paper, this method is examined against, and revised in view of, the fatigue data acquired since then, and subsequently simplified so as to become adaptable to the Class 1 piping besides the Class 1 vessels. Then, these two versions of this evaluation method are combined into a methodological system by their respective nature, and, in doing so, have proved their worth by applying themselves to several different sorts of component. The results show that the effects of the light water reactor environments on the fatigue life is a factor of 2 or so in terms of the increase of the usage factor (i.e., the environmental effect correction factor Fen = ca. 2).

Author Information

Kishida, K
Ishikawajima-Harima Heavy Industries Co., Ltd., Yokohama, Japan
Umakoshi, T
Kobe Shipyard and Machinery Works, Mitsubishi Heavy Industries Co., Ltd., Kobe, Japan
Asada, Y
University of Tokyo, Tokyo, Japan
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Developed by Committee: G01
Pages: 282–297
DOI: 10.1520/STP19967S
ISBN-EB: 978-0-8031-5357-8
ISBN-13: 978-0-8031-2408-0