The effect of flow-accelerated corrosion with high-temperature sodium hydroxide on tube target-wastage caused in steam generator of sodium-cooled fast reactor

Wastage phenomena on adjacent tubes (target-wastage) arise from water/steam leak in steam generators of sodium-cooled fast reactors. Target-wastage is likely to be caused by liquid droplet impingement erosion and flow-accelerated corrosion in an environment marked by high-temperature and high-alkali (reaction jet) due to sodium-water reaction. The static and flow-accelerated corrosion experiments have been carried out as a part of phenomena clarification experiments for target-wastage by using tube material under high-temperature sodium-hydroxide and sodium monoxide conditions which are mainly generated by sodium-water reaction. The authors evaluated the dependence of liquid/tube material temperature and liquid impingement velocity upon the flow-accelerated corrosion rate on the tube in this report. (author)