Irradiation assisted stress corrosion cracking of core components

Aki Toivonen, Pertti Aaltonen, Pertti Nenonen, Ulla Ehrnsten, Arvo Käki, Matti Valo, Arto Kukkonen, O. Hietanen

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

    1 Citation (Scopus)

    Abstract

    A test program on a reactor core material originating from the bottom end of a VVER absorber element is being carried out in aim to characterize the changes in mechanical properties and the occurrence of irradiation assisted stress corrosion cracking in PWR environments by laboratory tests. The mechanical and microstructural properties of the absorber bottom end material have changed due to neutron exposure. However, the material's response to neutron irradiation differs from the usual response of austenitic stainless steels. Yield strength, tensile strength, and dislocation loop density are all lower than expected. An enhancing effect of Ti-carbide precipitations on the defect density is another new finding of interest. High defect density close to the Ti-carbides is presumed to result from the stress/strain field caused by the precipitations.
    Original languageEnglish
    Title of host publicationPlant Life Management
    Subtitle of host publicationMidterm status of a R&D project
    Place of PublicationEspoo
    PublisherVTT Technical Research Centre of Finland
    Pages241-255
    ISBN (Electronic)951-38-5728-X
    ISBN (Print)951-38-5727-1
    Publication statusPublished - 2001
    MoE publication typeA4 Article in a conference publication
    EventPlant Life Management: Midterm status of a R&D project - Espoo, Finland
    Duration: 1 Jan 20011 Jan 2001

    Publication series

    SeriesVTT Symposium
    Number218
    ISSN0357-9387

    Conference

    ConferencePlant Life Management
    CountryFinland
    CityEspoo
    Period1/01/011/01/01

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    Cite this

    Toivonen, A., Aaltonen, P., Nenonen, P., Ehrnsten, U., Käki, A., Valo, M., Kukkonen, A., & Hietanen, O. (2001). Irradiation assisted stress corrosion cracking of core components. In Plant Life Management: Midterm status of a R&D project (pp. 241-255). VTT Technical Research Centre of Finland. VTT Symposium, No. 218 http://www.vtt.fi/inf/pdf/symposiums/2001/S218.pdf