EFFECTS OF HYDROGEN ON SCC GROWTH RATE OF NI ALLOYS

摘要

PWSCC in Alloy 600 and Alloy 182, 132 and 82 weld metals is important because these materials are widely used in the PWR coolant system. Plant experience indicates that PWSCC will steadily increase as plants age without effective mitigation. This study is investigating the mitigation of PWSCC initiation and propagation by adjusting the current operating PWR primary water chemistry, including dissolved hydrogen, lithium and boron concentrations, the pH at temperature, and Zn additions.