Measurements of the Extension of the Magnetite Piles on Steam Generator Tubing with Eddy Current Techniques

Tarja Jäppinen, Sanna Ala-Kleme

    Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientific

    Abstract

    Eddy current method is the main method in the nuclear power plant in-service inspections to inspect the integrity of the steam generator tubing. The method has high inspection speed and it is sensitive to both inner surface and outer surface defects. The applied inspection techniques are based on the use of bobbing probes. During operation of the pressurized water reactor magnetite deposits precipitate on the outer surfaces of the steam generator tubing. After deposits have grown thick enough, the deposits peel as flakes from the surface of the tubes. These magnetite flakes can form magnetite piles. In this study experiments were conducted to detect the extension of the magnetite piles. For this purpose a simple mock-up simulating the horizontal steam generator tubing with parallel horizontal tubes was constructed. Piles of magnetite flakes were heaped up between the tubes. In the tests a single bobbin probe and a novel two-probe technique was used. The goal of the experiment was to study the eddy current signal on different piles of magnetite in order to map the existence and location of the magnetite piles within the steam generator tubing. The conducted experiments showed that the existence of the magnetic piles can be detected with the applied techniques. The results of the experiments are presented.
    Original languageEnglish
    Title of host publicationWCNDT 2016
    Number of pages8
    Publication statusPublished - 2016
    MoE publication typeB3 Non-refereed article in conference proceedings
    Event19th World Conference on Non-Destructive Testing, WCNDT 2016 - Munich, Germany
    Duration: 13 Jun 201617 Jun 2016

    Conference

    Conference19th World Conference on Non-Destructive Testing, WCNDT 2016
    Abbreviated titleWCNDT 2016
    CountryGermany
    CityMunich
    Period13/06/1617/06/16

    Fingerprint

    Magnetite
    Steam generators
    Tubing
    Eddy currents
    Piles
    Deposits
    Inspection
    Experiments
    Bobbins
    Pressurized water reactors
    Surface defects
    Nuclear power plants
    Precipitates

    Keywords

    • nondestructive testing
    • NDT
    • NDE
    • eddy current
    • steam generator
    • magnetite

    Cite this

    @inproceedings{c80823881136425e8fa87bf6f9d9581a,
    title = "Measurements of the Extension of the Magnetite Piles on Steam Generator Tubing with Eddy Current Techniques",
    abstract = "Eddy current method is the main method in the nuclear power plant in-service inspections to inspect the integrity of the steam generator tubing. The method has high inspection speed and it is sensitive to both inner surface and outer surface defects. The applied inspection techniques are based on the use of bobbing probes. During operation of the pressurized water reactor magnetite deposits precipitate on the outer surfaces of the steam generator tubing. After deposits have grown thick enough, the deposits peel as flakes from the surface of the tubes. These magnetite flakes can form magnetite piles. In this study experiments were conducted to detect the extension of the magnetite piles. For this purpose a simple mock-up simulating the horizontal steam generator tubing with parallel horizontal tubes was constructed. Piles of magnetite flakes were heaped up between the tubes. In the tests a single bobbin probe and a novel two-probe technique was used. The goal of the experiment was to study the eddy current signal on different piles of magnetite in order to map the existence and location of the magnetite piles within the steam generator tubing. The conducted experiments showed that the existence of the magnetic piles can be detected with the applied techniques. The results of the experiments are presented.",
    keywords = "nondestructive testing, NDT, NDE, eddy current, steam generator, magnetite",
    author = "Tarja J{\"a}ppinen and Sanna Ala-Kleme",
    note = "Peer-reviewed: Abstract only Project : 108802",
    year = "2016",
    language = "English",
    booktitle = "WCNDT 2016",

    }

    Jäppinen, T & Ala-Kleme, S 2016, Measurements of the Extension of the Magnetite Piles on Steam Generator Tubing with Eddy Current Techniques. in WCNDT 2016. 19th World Conference on Non-Destructive Testing, WCNDT 2016, Munich, Germany, 13/06/16.

    Measurements of the Extension of the Magnetite Piles on Steam Generator Tubing with Eddy Current Techniques. / Jäppinen, Tarja; Ala-Kleme, Sanna.

    WCNDT 2016. 2016.

    Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientific

    TY - GEN

    T1 - Measurements of the Extension of the Magnetite Piles on Steam Generator Tubing with Eddy Current Techniques

    AU - Jäppinen, Tarja

    AU - Ala-Kleme, Sanna

    N1 - Peer-reviewed: Abstract only Project : 108802

    PY - 2016

    Y1 - 2016

    N2 - Eddy current method is the main method in the nuclear power plant in-service inspections to inspect the integrity of the steam generator tubing. The method has high inspection speed and it is sensitive to both inner surface and outer surface defects. The applied inspection techniques are based on the use of bobbing probes. During operation of the pressurized water reactor magnetite deposits precipitate on the outer surfaces of the steam generator tubing. After deposits have grown thick enough, the deposits peel as flakes from the surface of the tubes. These magnetite flakes can form magnetite piles. In this study experiments were conducted to detect the extension of the magnetite piles. For this purpose a simple mock-up simulating the horizontal steam generator tubing with parallel horizontal tubes was constructed. Piles of magnetite flakes were heaped up between the tubes. In the tests a single bobbin probe and a novel two-probe technique was used. The goal of the experiment was to study the eddy current signal on different piles of magnetite in order to map the existence and location of the magnetite piles within the steam generator tubing. The conducted experiments showed that the existence of the magnetic piles can be detected with the applied techniques. The results of the experiments are presented.

    AB - Eddy current method is the main method in the nuclear power plant in-service inspections to inspect the integrity of the steam generator tubing. The method has high inspection speed and it is sensitive to both inner surface and outer surface defects. The applied inspection techniques are based on the use of bobbing probes. During operation of the pressurized water reactor magnetite deposits precipitate on the outer surfaces of the steam generator tubing. After deposits have grown thick enough, the deposits peel as flakes from the surface of the tubes. These magnetite flakes can form magnetite piles. In this study experiments were conducted to detect the extension of the magnetite piles. For this purpose a simple mock-up simulating the horizontal steam generator tubing with parallel horizontal tubes was constructed. Piles of magnetite flakes were heaped up between the tubes. In the tests a single bobbin probe and a novel two-probe technique was used. The goal of the experiment was to study the eddy current signal on different piles of magnetite in order to map the existence and location of the magnetite piles within the steam generator tubing. The conducted experiments showed that the existence of the magnetic piles can be detected with the applied techniques. The results of the experiments are presented.

    KW - nondestructive testing

    KW - NDT

    KW - NDE

    KW - eddy current

    KW - steam generator

    KW - magnetite

    M3 - Conference article in proceedings

    BT - WCNDT 2016

    ER -