Locating magnetite on the steam generator tubes with eddy current

Tarja Jäppinen, Kari Lahdenperä, Sanna Ala-Kleme

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


    The magnetite deposition on the secondary circuit of the steam generator tubing is considered a problem, because is many cases the growing defects are located at the same place as the magnetic deposits. For this reason it is more and more important to locate and size the piles of magnetite on the tubing. The steam generator tubes are generally inspected by eddy current methods. During the in-service inspection the size of the magnetite deposit is not determined, only the notification of its existence is given in the inspection report. In this study experiments were conducted by using eddy current techniques and ordinary bobbin probes to size the thickness of magnetite piles on the test tubes. Tubes were simulating the horizontal steam generator tubes. Results of low frequency tests are shown.
    Original languageEnglish
    Title of host publicationProceedings
    Subtitle of host publication18th World Conference on Nondestructive Testing, WCNDT
    Number of pages9
    Publication statusPublished - 2012
    MoE publication typeA4 Article in a conference publication
    Event18th World Conference on Non-Destructive Testing, WCNDT - Durban, South Africa
    Duration: 16 Apr 201220 Apr 2012


    Conference18th World Conference on Non-Destructive Testing, WCNDT
    Abbreviated titleWCNDT
    Country/TerritorySouth Africa


    • magnetite deposit
    • sludge pile
    • eddy current
    • bobbin probe
    • steam generator tube


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