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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 elucidation experiments for target-wastage by using actual 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 velocity upon the flow-accelerated corrosion rate on the tube and derived the new correlation of flow-accelerated corrosion for target-wastage taking into account local wastage environment in this report.

nihon kikai gakkai ronbunshū. b

The Effect of Flow-Accelerated Corrosion with High-Temperature Sodium Hydroxide on Tube Target-Wastage Caused in Steam Generator of Sodium-Cooled Fast Reactor