Disposal canister shock absorber tests and analysis

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

    Abstract

    In the Finnish final disposal plan the spent fuel canister will be transferred to an underground repository at 400-450 meters below ground surface by a vertical lift. This paper considers the postulated accident scenario where the disposal canister falls during transportation. In case of free fall, the 25-ton disposal canister can reach a velocity of 90 m/s before impacting the shock absorber. The shock absorber is designed to consist of cohesionless granular lightweight expanded clay aggregate (LECA) material that will decelerate the disposal canister in a controlled manner. By utilizing the IMPACT test facility at VTT Technical Research Centre of Finland, laboratory scale shock absorber tests have been carried out. A rigid scale model of the disposal canister was shot into a shock absorber pipe in a horizontal setting with a realistic velocity. A total of 21 tests have been carried out with velocities ranging from 38 m/s to 97 m/s using disposal canister scale models with diameters from 63 mm to 150 mm. Other dimensions in the testing were scaled correspondingly. The aim of the experiments and numerical analysis was to assess the behavior of LECA as shock absorbing material and determine both the required depth of the shock absorber and loading subjected to the disposal canister. LECA used in the tests had grain size of 4-10 mm. The test results show a clear trend of penetration distance increasing as the impact velocity increases and some scatter. No distinctive effect of the test scale was seen in the results.
    Original languageEnglish
    Title of host publicationProceedings
    Subtitle of host publicationInternational Conference on Structural Mechanics in Reactor Technology 2013, SMiRT 22
    PublisherInternational Assn for Structural Mechanics in Reactor Technology IASMiRT
    Number of pages10
    ISBN (Print)978-1-6326-6762-5
    Publication statusPublished - 2013
    MoE publication typeNot Eligible
    Event22nd International Conference on Structural Mechanics in Reactor Technology 2013, SMiRT 22 - San Francisco, United States
    Duration: 18 Aug 201323 Aug 2013
    Conference number: 23

    Conference

    Conference22nd International Conference on Structural Mechanics in Reactor Technology 2013, SMiRT 22
    Abbreviated titleSMiRT 22
    CountryUnited States
    CitySan Francisco
    Period18/08/1323/08/13

    Fingerprint

    Shock absorbers
    Clay
    Spent fuels
    Test facilities
    Numerical analysis
    Accidents
    Pipe
    Testing
    Experiments

    Keywords

    • disposal canister
    • accident
    • impact
    • shock absorber
    • ProperTune

    Cite this

    Kuutti, J., Fortino, S., Hakola, I., & Heinonen, J. (2013). Disposal canister shock absorber tests and analysis. In Proceedings: International Conference on Structural Mechanics in Reactor Technology 2013, SMiRT 22 International Assn for Structural Mechanics in Reactor Technology IASMiRT .
    Kuutti, Juha ; Fortino, Stefania ; Hakola, Ilkka ; Heinonen, Jaakko. / Disposal canister shock absorber tests and analysis. Proceedings: International Conference on Structural Mechanics in Reactor Technology 2013, SMiRT 22. International Assn for Structural Mechanics in Reactor Technology IASMiRT , 2013.
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    title = "Disposal canister shock absorber tests and analysis",
    abstract = "In the Finnish final disposal plan the spent fuel canister will be transferred to an underground repository at 400-450 meters below ground surface by a vertical lift. This paper considers the postulated accident scenario where the disposal canister falls during transportation. In case of free fall, the 25-ton disposal canister can reach a velocity of 90 m/s before impacting the shock absorber. The shock absorber is designed to consist of cohesionless granular lightweight expanded clay aggregate (LECA) material that will decelerate the disposal canister in a controlled manner. By utilizing the IMPACT test facility at VTT Technical Research Centre of Finland, laboratory scale shock absorber tests have been carried out. A rigid scale model of the disposal canister was shot into a shock absorber pipe in a horizontal setting with a realistic velocity. A total of 21 tests have been carried out with velocities ranging from 38 m/s to 97 m/s using disposal canister scale models with diameters from 63 mm to 150 mm. Other dimensions in the testing were scaled correspondingly. The aim of the experiments and numerical analysis was to assess the behavior of LECA as shock absorbing material and determine both the required depth of the shock absorber and loading subjected to the disposal canister. LECA used in the tests had grain size of 4-10 mm. The test results show a clear trend of penetration distance increasing as the impact velocity increases and some scatter. No distinctive effect of the test scale was seen in the results.",
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    author = "Juha Kuutti and Stefania Fortino and Ilkka Hakola and Jaakko Heinonen",
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    Kuutti, J, Fortino, S, Hakola, I & Heinonen, J 2013, Disposal canister shock absorber tests and analysis. in Proceedings: International Conference on Structural Mechanics in Reactor Technology 2013, SMiRT 22. International Assn for Structural Mechanics in Reactor Technology IASMiRT , 22nd International Conference on Structural Mechanics in Reactor Technology 2013, SMiRT 22, San Francisco, United States, 18/08/13.

    Disposal canister shock absorber tests and analysis. / Kuutti, Juha; Fortino, Stefania; Hakola, Ilkka; Heinonen, Jaakko.

    Proceedings: International Conference on Structural Mechanics in Reactor Technology 2013, SMiRT 22. International Assn for Structural Mechanics in Reactor Technology IASMiRT , 2013.

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

    TY - GEN

    T1 - Disposal canister shock absorber tests and analysis

    AU - Kuutti, Juha

    AU - Fortino, Stefania

    AU - Hakola, Ilkka

    AU - Heinonen, Jaakko

    N1 - Project code: 83133

    PY - 2013

    Y1 - 2013

    N2 - In the Finnish final disposal plan the spent fuel canister will be transferred to an underground repository at 400-450 meters below ground surface by a vertical lift. This paper considers the postulated accident scenario where the disposal canister falls during transportation. In case of free fall, the 25-ton disposal canister can reach a velocity of 90 m/s before impacting the shock absorber. The shock absorber is designed to consist of cohesionless granular lightweight expanded clay aggregate (LECA) material that will decelerate the disposal canister in a controlled manner. By utilizing the IMPACT test facility at VTT Technical Research Centre of Finland, laboratory scale shock absorber tests have been carried out. A rigid scale model of the disposal canister was shot into a shock absorber pipe in a horizontal setting with a realistic velocity. A total of 21 tests have been carried out with velocities ranging from 38 m/s to 97 m/s using disposal canister scale models with diameters from 63 mm to 150 mm. Other dimensions in the testing were scaled correspondingly. The aim of the experiments and numerical analysis was to assess the behavior of LECA as shock absorbing material and determine both the required depth of the shock absorber and loading subjected to the disposal canister. LECA used in the tests had grain size of 4-10 mm. The test results show a clear trend of penetration distance increasing as the impact velocity increases and some scatter. No distinctive effect of the test scale was seen in the results.

    AB - In the Finnish final disposal plan the spent fuel canister will be transferred to an underground repository at 400-450 meters below ground surface by a vertical lift. This paper considers the postulated accident scenario where the disposal canister falls during transportation. In case of free fall, the 25-ton disposal canister can reach a velocity of 90 m/s before impacting the shock absorber. The shock absorber is designed to consist of cohesionless granular lightweight expanded clay aggregate (LECA) material that will decelerate the disposal canister in a controlled manner. By utilizing the IMPACT test facility at VTT Technical Research Centre of Finland, laboratory scale shock absorber tests have been carried out. A rigid scale model of the disposal canister was shot into a shock absorber pipe in a horizontal setting with a realistic velocity. A total of 21 tests have been carried out with velocities ranging from 38 m/s to 97 m/s using disposal canister scale models with diameters from 63 mm to 150 mm. Other dimensions in the testing were scaled correspondingly. The aim of the experiments and numerical analysis was to assess the behavior of LECA as shock absorbing material and determine both the required depth of the shock absorber and loading subjected to the disposal canister. LECA used in the tests had grain size of 4-10 mm. The test results show a clear trend of penetration distance increasing as the impact velocity increases and some scatter. No distinctive effect of the test scale was seen in the results.

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    KW - accident

    KW - impact

    KW - shock absorber

    KW - ProperTune

    M3 - Conference article in proceedings

    SN - 978-1-6326-6762-5

    BT - Proceedings

    PB - International Assn for Structural Mechanics in Reactor Technology IASMiRT

    ER -

    Kuutti J, Fortino S, Hakola I, Heinonen J. Disposal canister shock absorber tests and analysis. In Proceedings: International Conference on Structural Mechanics in Reactor Technology 2013, SMiRT 22. International Assn for Structural Mechanics in Reactor Technology IASMiRT . 2013