Buffer Design 2012

Markku Juvankoski

    Research output: Book/ReportReport


    Posiva's spent nuclear fuel disposal is based on the KBS-3V concept and on the characteristics of the Olkiluoto site. In this concept single canisters containing spent nuclear fuel surrounded by a bentonite buffer are emplaced in individual vertical boreholes drilled in the floor of deposition tunnels in bedrock at about 420 m depth below ground level. Disk type bentonite blocks are installed at the bottom of the hole and on the top of the disposal canister. Ring type bentonite blocks surround the canisters. This report describes the detailed design of the buffer for a KBS-3V repository. The report presents the design basis, the reference design, and summarises the performance analyses carried out for the design. This report addresses aspects concerning the manufacture, quality control, mechanical strength, chemical resistance, thermal dimensioning, handling of buffer components and material ageing phenomena including the effect of radiation. Interaction of buffer and other engineered barriers are included in the study. The long-term evolution of the repository and its effective drivers are considered if they have an impact on the buffer performance but operational safety aspects are also included because they may affect long-term safety.
    Original languageEnglish
    Number of pages247
    ISBN (Print)978-951-652-195-7
    Publication statusPublished - 2013
    MoE publication typeD4 Published development or research report or study

    Publication series

    SeriesPosiva Report


    • KBS-3V
    • spent nuclear fuel repository
    • buffer
    • bentonite block
    • detailed design
    • reference design
    • deposition hole
    • gap filling
    • pellets
    • manufacturing


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