Cathodic polarization curves of the oxygen reduction reaction on various structural materials of boiling water reactors in high temperature-high purity water

Masahiko Tachibana, Kazushige Ishida, Yoichi Wada, Ryosuke Shimizu, Nobuyuki Ota, Nobuyoshi Hara

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

Cathodic polarization curves of the O 2 reduction reaction were measured by using electrodes made from typical structural materials of boiling water reactors (BWRs) to evaluate the effects of kind of material on the electrochemical corrosion potential (ECP) calculation. To estimate ECPs at any region in the BWRs on the basis of the BWR environmental conditions, anodic and cathodic polarization curves should be obtained in advance under relevant conditions. The concentration of oxidants such as O 2 and H 2O 2 in coolant changes depending on the region in which they exist. As well, reduction reaction rates might differ depending on the kind of materials. In this work, the cathodic polarization curves of type 316L stainless steel (316L SS) and Alloy 182 were measured in high purity water at 553 K with different O 2 concentrations and compared with those of type 304 SS (304 SS). The results showed that the cathodic polarization curves differed depending on the kind of materials at the activation-controlled region. But, the difference in the ECP vs. O 2 concentration relationship was small when the ECPs were calculated by using both anodic and cathodic polarization curves measured on the objective material.

Original languageEnglish
Pages (from-to)551-561
Number of pages11
Journaljournal of nuclear science and technology
Volume49
Issue number5
DOIs
Publication statusPublished - 2012 Jul 2

Keywords

  • Boiling water reactor
  • Electrochemical corrosion potential
  • Nickel-based alloy
  • Oxygen reduction reaction
  • Polarization curve
  • Stainless steel
  • Stress corrosion cracking

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Nuclear Energy and Engineering

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