Artificial flaw detection with ultrasound in austenitic stainless steels

Tuomas Koskinen, Esa Leskelä, Minnamari Vippola

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

    Abstract

    Ultrasonic testing is the main tool to inspect the structural integrity of primary circuit components in nuclear power plants (NPPs) during in-service inspection (ISI). In order to validate an inspection method and to train inspectors, reference flaws are needed. However, there are not enough real flaws available to be used for these purposes so artificial flaws must be used. Ultrasonic response from an artificial flaw must be representative enough so that it can be used as a reference flaw. Otherwise this could lead to a false result during an ISI. Unfortunately ultrasonic testing is highly dependent on the geometry of the component, the flaw type and the material in which ultrasound propagates. Therefore numerous flaws are needed to cover the probable flaw types, sizes and locations. The aim is to study artificial flaws and acquire wider knowledge on ultrasonic indications from artificial flaws in austenitic stainless steel weld and to compare them to the results from CIVA simulation. The study focuses on notches made by electrical discharge machining (EDM). EDM notches were chosen, since they represent a rough estimate of a crack type flaw and they are fairly quick and easy to manufacture.
    Original languageEnglish
    Title of host publicationBaltica X
    Subtitle of host publicationInternational Conference on Life Management and Maintenance for Power Plants
    EditorsPertti Auerkari
    Place of PublicationEspoo
    PublisherVTT Technical Research Centre of Finland
    Number of pages9
    ISBN (Electronic)978-951-38-8436-9, 978-951-38-8435-2
    Publication statusPublished - 2016
    MoE publication typeA4 Article in a conference publication
    EventBALTICA X - International Conference on Life Management and Maintenance for Power Plants - Cruise, Helsinki-Stockholm, Finland
    Duration: 7 Jun 20169 Jun 2016

    Publication series

    SeriesVTT Technology
    Volume261

    Conference

    ConferenceBALTICA X - International Conference on Life Management and Maintenance for Power Plants
    Abbreviated titleBaltica X
    CountryFinland
    CityHelsinki-Stockholm
    Period7/06/169/06/16

    Fingerprint

    Austenitic stainless steel
    Ultrasonics
    Defects
    Ultrasonic testing
    Electric discharge machining
    Inspection
    Structural integrity
    Nuclear power plants
    Welds
    Cracks
    Geometry
    Networks (circuits)

    Keywords

    • ultrasound
    • artificial flaws

    Cite this

    Koskinen, T., Leskelä, E., & Vippola, M. (2016). Artificial flaw detection with ultrasound in austenitic stainless steels. In P. Auerkari (Ed.), Baltica X: International Conference on Life Management and Maintenance for Power Plants Espoo: VTT Technical Research Centre of Finland. VTT Technology, Vol.. 261
    Koskinen, Tuomas ; Leskelä, Esa ; Vippola, Minnamari. / Artificial flaw detection with ultrasound in austenitic stainless steels. Baltica X: International Conference on Life Management and Maintenance for Power Plants. editor / Pertti Auerkari. Espoo : VTT Technical Research Centre of Finland, 2016. (VTT Technology, Vol. 261).
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    title = "Artificial flaw detection with ultrasound in austenitic stainless steels",
    abstract = "Ultrasonic testing is the main tool to inspect the structural integrity of primary circuit components in nuclear power plants (NPPs) during in-service inspection (ISI). In order to validate an inspection method and to train inspectors, reference flaws are needed. However, there are not enough real flaws available to be used for these purposes so artificial flaws must be used. Ultrasonic response from an artificial flaw must be representative enough so that it can be used as a reference flaw. Otherwise this could lead to a false result during an ISI. Unfortunately ultrasonic testing is highly dependent on the geometry of the component, the flaw type and the material in which ultrasound propagates. Therefore numerous flaws are needed to cover the probable flaw types, sizes and locations. The aim is to study artificial flaws and acquire wider knowledge on ultrasonic indications from artificial flaws in austenitic stainless steel weld and to compare them to the results from CIVA simulation. The study focuses on notches made by electrical discharge machining (EDM). EDM notches were chosen, since they represent a rough estimate of a crack type flaw and they are fairly quick and easy to manufacture.",
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    Koskinen, T, Leskelä, E & Vippola, M 2016, Artificial flaw detection with ultrasound in austenitic stainless steels. in P Auerkari (ed.), Baltica X: International Conference on Life Management and Maintenance for Power Plants. VTT Technical Research Centre of Finland, Espoo, VTT Technology, vol. 261, BALTICA X - International Conference on Life Management and Maintenance for Power Plants, Helsinki-Stockholm, Finland, 7/06/16.

    Artificial flaw detection with ultrasound in austenitic stainless steels. / Koskinen, Tuomas; Leskelä, Esa; Vippola, Minnamari.

    Baltica X: International Conference on Life Management and Maintenance for Power Plants. ed. / Pertti Auerkari. Espoo : VTT Technical Research Centre of Finland, 2016. (VTT Technology, Vol. 261).

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

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    AU - Leskelä, Esa

    AU - Vippola, Minnamari

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    N2 - Ultrasonic testing is the main tool to inspect the structural integrity of primary circuit components in nuclear power plants (NPPs) during in-service inspection (ISI). In order to validate an inspection method and to train inspectors, reference flaws are needed. However, there are not enough real flaws available to be used for these purposes so artificial flaws must be used. Ultrasonic response from an artificial flaw must be representative enough so that it can be used as a reference flaw. Otherwise this could lead to a false result during an ISI. Unfortunately ultrasonic testing is highly dependent on the geometry of the component, the flaw type and the material in which ultrasound propagates. Therefore numerous flaws are needed to cover the probable flaw types, sizes and locations. The aim is to study artificial flaws and acquire wider knowledge on ultrasonic indications from artificial flaws in austenitic stainless steel weld and to compare them to the results from CIVA simulation. The study focuses on notches made by electrical discharge machining (EDM). EDM notches were chosen, since they represent a rough estimate of a crack type flaw and they are fairly quick and easy to manufacture.

    AB - Ultrasonic testing is the main tool to inspect the structural integrity of primary circuit components in nuclear power plants (NPPs) during in-service inspection (ISI). In order to validate an inspection method and to train inspectors, reference flaws are needed. However, there are not enough real flaws available to be used for these purposes so artificial flaws must be used. Ultrasonic response from an artificial flaw must be representative enough so that it can be used as a reference flaw. Otherwise this could lead to a false result during an ISI. Unfortunately ultrasonic testing is highly dependent on the geometry of the component, the flaw type and the material in which ultrasound propagates. Therefore numerous flaws are needed to cover the probable flaw types, sizes and locations. The aim is to study artificial flaws and acquire wider knowledge on ultrasonic indications from artificial flaws in austenitic stainless steel weld and to compare them to the results from CIVA simulation. The study focuses on notches made by electrical discharge machining (EDM). EDM notches were chosen, since they represent a rough estimate of a crack type flaw and they are fairly quick and easy to manufacture.

    KW - ultrasound

    KW - artificial flaws

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    Koskinen T, Leskelä E, Vippola M. Artificial flaw detection with ultrasound in austenitic stainless steels. In Auerkari P, editor, Baltica X: International Conference on Life Management and Maintenance for Power Plants. Espoo: VTT Technical Research Centre of Finland. 2016. (VTT Technology, Vol. 261).