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Vol.6 No.4previous AA 82-SP13 (83-84-85-86)-NT67-68

Academic Articles
Regular Paper Vol.6 No.4 (2015) p.131 - p.145

Effect of Ethanolamine Injection on Wall Thinning Rate of PWR Carbon Steel Components


1 Institute of Nuclear Safety System, Inc., Sata 64, Mikata-gun, Mihama-cho, Fukui 919-1205, Japan

For pH control of PWR secondary system water chemistry, some plants have changed to ethanolamine injection. The purpose of this work was to understand the effect of changing water chemistry on wall thinning rate of the PWR secondary system due to flow accelerated corrosion. For that purpose, evaluations of water chemistry were carried out by a mass balance calculation, wall thinning rate measurement by a rotary disk test and wall thinning rate evaluation based on calculated magnetite solubility. As a result, it was found to be effective to inhibit the wall thinning rate of the PWR secondary system due to flow accelerated corrosion by ethanolamine injection, but it was not sufficiently effect to neglect wall thinning rate due to flow accelerated corrosion. The effect of the wall thinning rate inhibition also varied greatly for each component of the PWR secondary system. It was found that maintenance of the carbon steel used for the PWR secondary system was still required under ethanolamine injection condition.
PWR, Ethanolamine, Wall thinning rate, Flow accelerated corrosion, Carbon steel, Water chemistry
Full Paper: PDF EJAM Vol.6No.4 pp.131-145 "Effect of Ethanolamine Injection on Wall Thinning Rate of PWR Carbon Steel Components"
Article Information
Article history:
Received 19 May 2014
Accepted 20 October 2014