NDE of the disposal canisters

Ari Koskinen, Tarja Jäppinen, Matti Sarkimo, Aarne Lipponen, Jonne Haapalainen, Stefan Sandlin, Esa Leskelä, Jorma Pitkänen

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

    Abstract

    The Finnish concept of high activity nuclear waste disposal is based on deep geological storage in copper canisters with cast iron inserts. Disposal canisters will be embedded in Olkiluoto bedrock at the depth of approximately 400 metres. Therefore it is essential to inspect the canisters with non-destructive testing (NDT) methods as well as possible before the final disposal. The lid of the copper disposal canister for high activity nuclear waste is sealed with a weld. Before accepting the canister to the final disposal the weld will be inspected by four non-destructive testing methods. These methods are ultrasonic testing (UT), radiographic testing (RT), eddy current testing (ET) and remote visual testing (VT) using cameras. The copper overpack and the lid are also inspected with multiple NDT methods; UT, ET and VT. The nodular cast iron insert is inspected with UT and VT. In this paper the four NDT inspection methods for inspection of different parts of the disposal canister are presented in brief. All information in this paper is collected and summarised from public reports and from the procedures of each method and inspection records. Also experts have been interviewed. All of the four NDT methods detect defects in slightly different directions and based on different physical principles. The four methods are therefore supplements to each other in inspection of different parts of the disposal canister.
    Original languageEnglish
    Title of host publicationBaltica IX. International Conference on Life Management and Maintenance for Power Plants
    EditorsPertti Auerkari, Juha Veivo
    Place of PublicationEspoo
    PublisherVTT Technical Research Centre of Finland
    Pages411-423
    ISBN (Electronic)978-951-38-8026-2
    ISBN (Print)978-951-38-8025-5
    Publication statusPublished - 2013
    MoE publication typeA4 Article in a conference publication
    EventBALTICA IX - International Conference on Life Management and Maintenance for Power Plants - Helsinki-Stockholm, Finland
    Duration: 11 Jun 201313 Jun 2013

    Publication series

    SeriesVTT Technology
    Number106
    ISSN2242-1211

    Conference

    ConferenceBALTICA IX - International Conference on Life Management and Maintenance for Power Plants
    CountryFinland
    CityHelsinki-Stockholm
    Period11/06/1313/06/13

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  • Cite this

    Koskinen, A., Jäppinen, T., Sarkimo, M., Lipponen, A., Haapalainen, J., Sandlin, S., Leskelä, E., & Pitkänen, J. (2013). NDE of the disposal canisters. In P. Auerkari, & J. Veivo (Eds.), Baltica IX. International Conference on Life Management and Maintenance for Power Plants (pp. 411-423). VTT Technical Research Centre of Finland. VTT Technology, No. 106 https://www.vtt.fi/inf/pdf/technology/2013/T106.pdf