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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


Approach
Approach

  • 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

Cover-to-Collar Weld

Threaded Collar

Locking Ring

Shield Plug

Main Shell


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