Effects of gamma ray irradiation on corrosion of carbon steel at water line

Tomomichi Ariga, Hiroshi Abe, Yutaka Watanabe

Research output: Contribution to conferencePaperpeer-review

Abstract

After the accident at the Fukushima Daiichi Nuclear Power Station, seawater was injected into the reactor vessels and the spent fuel pools as an emergency cooling measure. Environmental conditions at the site have been improved by reducing the concentration of dissolved oxygen and removing the chloride ions. However, the inner walls of the primary containment vessels (PCVs) made of carbon steel were either immersed in water or covered with a water film. Moreover, the inner surfaces of the PCVs were exposed to gamma-ray irradiation. The corrosion rate of carbon steel is accelerated under a water film and in gamma-ray irradiation. Corrosion rate under a water film in a gamma-ray irradiation environment is not understood. To investigate the corrosion rate under a water film near the water line, specimens were prepared for two test methods: (1) full immersion and (2) partial immersion. Corrosion tests were conducted without irradiation and with irradiation. The measured corrosion rate of (1) was higher than that of (2), irrespective of gamma-ray irradiation. The highest corrosion rate was found at the water line, and it was four times higher than the average rate under both conditions. The highest corrosion rate is at the water line under irradiation.

Original languageEnglish
Pages960-966
Number of pages7
Publication statusPublished - 2019
Event19th International Conference on Environmental Degradation of Materials in Nuclear Power Systems - Water Reactors, EnvDeg 2019 - Boston, United States
Duration: 2019 Aug 182019 Aug 22

Conference

Conference19th International Conference on Environmental Degradation of Materials in Nuclear Power Systems - Water Reactors, EnvDeg 2019
CountryUnited States
CityBoston
Period19/8/1819/8/22

ASJC Scopus subject areas

  • Nuclear Energy and Engineering
  • Pollution

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