Comparison of Artificial flaws in Austenitic Steel Welds with NDE Methods

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

    Abstract

    Qualification of non-destructive examination (NDE) procedures for in-service inspections (ISI) of nuclear power plant (NPP) components is performed using different types of artificial flaws. The assessment of the reliability of a procedure requires representative flaws compared to the real service-induced flaws. Fatigue cracks can nowadays be produced artificially as thermal fatigue or mechanical fatigue cracks. Thermal fatigue crack production is very well controlled in matter of size and opening. That kind of cracks are very realistic option compared to the real service-induced cracks. Mechanical fatigue crack production is well known and widely used method and can produce very realistic cracks as well. The aim of the study is to get a wider perspective to the differences in similar type of flaws from different manufacturers. Ultrasonic indications are highly dependent on defect characteristics like roughness, crack opening, tilt and branching. This work studies the influence of different reflector properties on flaw indications. Two kinds of artificially produced cracks from different manufactures and one EDM (electric discharge machining) reference notch were made in welded austenitic stainless steel test blocks. Flaws were examined using conventional ultrasonic testing (UT), phased array ultrasonic testing (PAUT) and computed tomography (CT). The flaws were sized with different techniques and those results are compared to the true state flaw dimensions as determined by destructive analysis. This study was made as a part of Finnish national research program on NPP safety 2010-2014 (SAFIR2014), Monitoring of the structural integrity of materials and components in reactor circuit, MAKOMON project.
    Original languageEnglish
    Title of host publicationProceedings of the 11th international conference on NDE in relation to structural integrity for nuclear and pressurized components
    PublisherEuropean Union
    ISBN (Print)978-92-79-57266-1
    DOIs
    Publication statusPublished - 2015
    MoE publication typeB3 Non-refereed article in conference proceedings
    Event11th International Conference on NDE in Relation to Structural Integrity for Nuclear and Pressurized Components - Jeju Island, Korea, Democratic People's Republic of
    Duration: 19 May 201521 May 2015
    Conference number: 11

    Conference

    Conference11th International Conference on NDE in Relation to Structural Integrity for Nuclear and Pressurized Components
    CountryKorea, Democratic People's Republic of
    CityJeju Island
    Period19/05/1521/05/15

    Fingerprint

    Austenitic steel
    Nondestructive examination
    Welds
    Defects
    Cracks
    Ultrasonic testing
    Thermal fatigue
    Nuclear power plants
    Electric discharge machining
    Structural integrity
    Austenitic stainless steel
    Tomography
    Inspection
    Ultrasonics
    Surface roughness
    Fatigue cracks
    Networks (circuits)
    Monitoring

    Keywords

    • ultrasonic testing (UT)
    • phased array
    • computed tomography
    • mechanical fatigue crack
    • thermal fatigue crack
    • indication
    • flaw
    • flaw sizing
    • Scanning Electron Microscope (SEM)
    • destructive testing

    Cite this

    Koskinen, A., & Leskelä, E. (2015). Comparison of Artificial flaws in Austenitic Steel Welds with NDE Methods. In Proceedings of the 11th international conference on NDE in relation to structural integrity for nuclear and pressurized components European Union. https://doi.org/10.2790/13215
    Koskinen, Ari ; Leskelä, Esa. / Comparison of Artificial flaws in Austenitic Steel Welds with NDE Methods. Proceedings of the 11th international conference on NDE in relation to structural integrity for nuclear and pressurized components. European Union, 2015.
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    abstract = "Qualification of non-destructive examination (NDE) procedures for in-service inspections (ISI) of nuclear power plant (NPP) components is performed using different types of artificial flaws. The assessment of the reliability of a procedure requires representative flaws compared to the real service-induced flaws. Fatigue cracks can nowadays be produced artificially as thermal fatigue or mechanical fatigue cracks. Thermal fatigue crack production is very well controlled in matter of size and opening. That kind of cracks are very realistic option compared to the real service-induced cracks. Mechanical fatigue crack production is well known and widely used method and can produce very realistic cracks as well. The aim of the study is to get a wider perspective to the differences in similar type of flaws from different manufacturers. Ultrasonic indications are highly dependent on defect characteristics like roughness, crack opening, tilt and branching. This work studies the influence of different reflector properties on flaw indications. Two kinds of artificially produced cracks from different manufactures and one EDM (electric discharge machining) reference notch were made in welded austenitic stainless steel test blocks. Flaws were examined using conventional ultrasonic testing (UT), phased array ultrasonic testing (PAUT) and computed tomography (CT). The flaws were sized with different techniques and those results are compared to the true state flaw dimensions as determined by destructive analysis. This study was made as a part of Finnish national research program on NPP safety 2010-2014 (SAFIR2014), Monitoring of the structural integrity of materials and components in reactor circuit, MAKOMON project.",
    keywords = "ultrasonic testing (UT), phased array, computed tomography, mechanical fatigue crack, thermal fatigue crack, indication, flaw, flaw sizing, Scanning Electron Microscope (SEM), destructive testing",
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    Koskinen, A & Leskelä, E 2015, Comparison of Artificial flaws in Austenitic Steel Welds with NDE Methods. in Proceedings of the 11th international conference on NDE in relation to structural integrity for nuclear and pressurized components. European Union, 11th International Conference on NDE in Relation to Structural Integrity for Nuclear and Pressurized Components, Jeju Island, Korea, Democratic People's Republic of, 19/05/15. https://doi.org/10.2790/13215

    Comparison of Artificial flaws in Austenitic Steel Welds with NDE Methods. / Koskinen, Ari; Leskelä, Esa.

    Proceedings of the 11th international conference on NDE in relation to structural integrity for nuclear and pressurized components. European Union, 2015.

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

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    AU - Leskelä, Esa

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    N2 - Qualification of non-destructive examination (NDE) procedures for in-service inspections (ISI) of nuclear power plant (NPP) components is performed using different types of artificial flaws. The assessment of the reliability of a procedure requires representative flaws compared to the real service-induced flaws. Fatigue cracks can nowadays be produced artificially as thermal fatigue or mechanical fatigue cracks. Thermal fatigue crack production is very well controlled in matter of size and opening. That kind of cracks are very realistic option compared to the real service-induced cracks. Mechanical fatigue crack production is well known and widely used method and can produce very realistic cracks as well. The aim of the study is to get a wider perspective to the differences in similar type of flaws from different manufacturers. Ultrasonic indications are highly dependent on defect characteristics like roughness, crack opening, tilt and branching. This work studies the influence of different reflector properties on flaw indications. Two kinds of artificially produced cracks from different manufactures and one EDM (electric discharge machining) reference notch were made in welded austenitic stainless steel test blocks. Flaws were examined using conventional ultrasonic testing (UT), phased array ultrasonic testing (PAUT) and computed tomography (CT). The flaws were sized with different techniques and those results are compared to the true state flaw dimensions as determined by destructive analysis. This study was made as a part of Finnish national research program on NPP safety 2010-2014 (SAFIR2014), Monitoring of the structural integrity of materials and components in reactor circuit, MAKOMON project.

    AB - Qualification of non-destructive examination (NDE) procedures for in-service inspections (ISI) of nuclear power plant (NPP) components is performed using different types of artificial flaws. The assessment of the reliability of a procedure requires representative flaws compared to the real service-induced flaws. Fatigue cracks can nowadays be produced artificially as thermal fatigue or mechanical fatigue cracks. Thermal fatigue crack production is very well controlled in matter of size and opening. That kind of cracks are very realistic option compared to the real service-induced cracks. Mechanical fatigue crack production is well known and widely used method and can produce very realistic cracks as well. The aim of the study is to get a wider perspective to the differences in similar type of flaws from different manufacturers. Ultrasonic indications are highly dependent on defect characteristics like roughness, crack opening, tilt and branching. This work studies the influence of different reflector properties on flaw indications. Two kinds of artificially produced cracks from different manufactures and one EDM (electric discharge machining) reference notch were made in welded austenitic stainless steel test blocks. Flaws were examined using conventional ultrasonic testing (UT), phased array ultrasonic testing (PAUT) and computed tomography (CT). The flaws were sized with different techniques and those results are compared to the true state flaw dimensions as determined by destructive analysis. This study was made as a part of Finnish national research program on NPP safety 2010-2014 (SAFIR2014), Monitoring of the structural integrity of materials and components in reactor circuit, MAKOMON project.

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    KW - computed tomography

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    KW - thermal fatigue crack

    KW - indication

    KW - flaw

    KW - flaw sizing

    KW - Scanning Electron Microscope (SEM)

    KW - destructive testing

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    DO - 10.2790/13215

    M3 - Conference article in proceedings

    SN - 978-92-79-57266-1

    BT - Proceedings of the 11th international conference on NDE in relation to structural integrity for nuclear and pressurized components

    PB - European Union

    ER -

    Koskinen A, Leskelä E. Comparison of Artificial flaws in Austenitic Steel Welds with NDE Methods. In Proceedings of the 11th international conference on NDE in relation to structural integrity for nuclear and pressurized components. European Union. 2015 https://doi.org/10.2790/13215