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DOE SNF Canister Planned Activities. Thomas Hill, NSNFP. November 9, 2005. Limited Canister Analysis Planned. Canister basket design Canister dynamic material properties verifications Transportation accident response. Canister Basket Development.

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doe snf canister planned activities

DOE SNF Canister Planned Activities

Thomas Hill, NSNFP

November 9, 2005

limited canister analysis planned
Limited Canister Analysis Planned
  • Canister basket design
  • Canister dynamic material properties verifications
  • Transportation accident response
canister basket development
Canister Basket Development
  • Canister defined by Preliminary Specification and Idaho Dry Storage Project design
  • Concept for canister baskets provided in criticality analysis, except for MCOs.
  • No functional or performance requirements available for canister baskets
  • General configurations of baskets used in a number of reports
  • NSNFP preparing a preliminary specification to guide basket design efforts.
doe canister analysis status
DOE Canister Analysis Status
  • The DOE canisters include both the Multi-Canister Overpacks (MCOs) and the standardized DOE SNF canisters
  • Full-scale drop tests have demonstrated that these canisters (at ambient temperatures) maintain containment (no-breach) after accidental drop events
  • Elastic-plastic analyses of these drop tests were performed (with an assumed 1.2 factored material true stress-strain curve increase) in order to demonstrate an acceptable analysis methodology
doe canister analysis status cont d
DOE Canister Analysis Status – cont’d
  • Analysis would cover other canister conditions, lower or higher temperatures, different internals, material aging issues, etc.
  • Canister deformations from very high strain levels require justification of material properties used in analysis predictions (ASME B&PV Code, Section III, Appendix F)
  • Material impact testing efforts justify the final material models used in analyses
material definition needs
Material Definition Needs
  • Loads associated with accidental drop events are typically design governing for canisters
  • The better the elastic-plastic material definition is, the better the analytical predictions
  • How much increase really exists is needed, since little information is readily available that addresses materials of interest at strain rates and temperatures of interest
  • The approach is to use the INL developed Impact Testing Machine or ITM
  • It is a drop weight device with weights as large as 1600 pounds and drop heights up to 13 feet
  • A true impact is achieved instead of a hydraulic-based system that imposes strain rates only
material impact testing goals
Material Impact Testing Goals
  • Quantify the increase (over that obtained from quasi-static tensile testing) of the canister material (304L and 316L stainless steels) true stress-strain curves
  • Examine if cracks or tearing is initiated
future dynamic testing efforts
Future Dynamic Testing Efforts
  • Address adequate range of strain rates
  • Incorporate temperature effects
  • Gain weld and base metal response insights
  • Determine flaw responses at varying strain rates
  • Investigate bending and shear responses
transportation accident evaluations
Transportation Accident Evaluations
  • To gain insights into the structural response of MCOs to hypothetical transportation accidents
  • Identify potential MCO transportation concerns using analytical techniques
  • Identify corrective actions for MCO transportation package
transportation package design
Transportation Package Design
  • Transportation package design / response assumed but based on existing industry product (Hi-Star 100)
  • Package has response of 60Gs maximum in any drop orientation
analyses to be performed
Analyses To Be Performed
  • Shielding calculations assess basic shielding needs (MCO and standardized canisters in existing casks)
  • Thermal calculations determine MCO material conditions
  • Transportation accident analyses to be made to estimate the structural responses
    • Ability of MCOs to maintain containment after hypothetical accident events
    • Ability of MCOs to be retrieved from transportation package after drop event
results to date
Results To Date
  • MCO can potentially impact an internal surface (cask top lid) and experience significant outward deformation in the threaded region near the final closure weld
  • Internal impact limiters or sleeve will be needed


Cover-to-Collar Weld

Threaded Collar

Locking Ring

Shield Plug

Main Shell