Due to thermal transients from the various operating phases of primary circuit in light water reactor, components are subject to an aging mechanism called fatigue. Fatigue is a phenomenon where a structure fails prematurely when subjected to cyclic loading. In the primary circuit this phenomenon is aggravated by the environment which is chemically active in nature. This results in environmentally assisted fatigue (EAF) and is characterized by a shorter fatigue life. EAF of the stainless-steel components in light water reactors has been the subject of extensive research and regulatory interest in France and abroad. Although majority of the components in the primary circuit are made of stainless steels, some are made of nickel 690 alloy. As a result, there is very little literature research on EAF of nickel alloys and therefore it is identified as the interest of IRSN to evaluate the effects of the environment on 690 alloy.
Souhaitez-vous présenter une affiche ?Environmentally assisted fatigue, Nickel 690 alloy, PWR environment
JAYARAMKushal GowdaIRSNkushal-gowda.jayaram@irsn.fr
