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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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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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.

KW - disposal canister

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