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Microbially Induced Corrosion in Firefighting Systems—Experience and Remedies

  • Ulla Ehrnstén
  • Leena Carpén
  • Kimmo Tompuri
Conference paper
Part of the The Minerals, Metals & Materials Series book series (MMMS)

Abstract

Firefighting water systems are important safety systems in all industries, including nuclear power plants (NPPs). However, they are susceptible to microbially induced corrosion, which is a degradation mode needing special attention. Leakages were observed in a fire fighting system made from stainless steel at a nuclear power plant shortly after maintenance and modernization work, which included replacement of part of the old carbon steel pipelines with stainless steel pipelines, as well as exchange of some Type 304 stainless steel pipes with Type 316 pipes due to relining parts of the system. The failure analysis revealed sub-surface corrosion cavities with pinholes at the inner surface and finally penetrating the whole pipe wall thickness. It was concluded that the reason for the leaks was due to microbially induced corrosion, (MIC). The paper will present the results from failure analyses, explain the remedial actions taken at the power plant, and discuss the implication of these findings on new similar systems, including the importance of avoiding iron deposits and optimization of water quality.

Keywords

Stainless steel Microbially induced corrosion Ageing management 

Notes

Acknowledgements

The work was performed for Teollisuuden Voima. This publication has been prepared as part of the Finnish national research program on reactor safety, SAFIR 2018, project THELMA. The funding is highly appreciated.

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Copyright information

© The Minerals, Metals & Materials Society 2019

Authors and Affiliations

  1. 1.VTT Technical Research Centre of Finland, VTTEspooFinland
  2. 2.Teollisuuden Voima OyjOlkiluotoFinland

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