Microbially induced corrosion in fire fighting systems - experience and remedies

    Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

    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.
    Original languageEnglish
    Title of host publicationProceedings of the 18th International Conference on Environmental Degradation of Materials in Nuclear Power Systems – Water Reactors
    EditorsMichael Wright, Denise Paraventi, John H. Jackson
    PublisherSpringer
    Pages831-840
    Number of pages10
    ISBN (Print)978-3-319-68453-6, 978-3-319-68454-3
    DOIs
    Publication statusPublished - 2018
    MoE publication typeA4 Article in a conference publication
    Event18th International Conference on Environmental Degradation of Materials in Nuclear Power Systems - Water Reactors, 2017 - Portland, United States
    Duration: 13 Aug 201717 Aug 2017

    Publication series

    SeriesMinerals, Metals and Materials Series
    VolumePart F11
    ISSN2367-1181

    Conference

    Conference18th International Conference on Environmental Degradation of Materials in Nuclear Power Systems - Water Reactors, 2017
    Abbreviated titleEDM 2017
    CountryUnited States
    CityPortland
    Period13/08/1717/08/17

    Keywords

    • nuclear
    • MIC
    • stainless steel
    • aging management

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  • Cite this

    Ehrnstén, U., Carpén, L., & Tompuri, K. (2018). Microbially induced corrosion in fire fighting systems - experience and remedies. In M. Wright, D. Paraventi, & J. H. Jackson (Eds.), Proceedings of the 18th International Conference on Environmental Degradation of Materials in Nuclear Power Systems – Water Reactors (pp. 831-840). Springer. Minerals, Metals and Materials Series, Vol.. Part F11 https://doi.org/10.1007/978-3-319-68454-3_62