1. November 9, 2005 Thomas Hill, NSNFP DOE SNF Canister Planned Activities

2. Limited Canister Analysis Planned Canister basket design Canister dynamic material properties verifications Transportation accident response

3. 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.

4. 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

5. 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

6. 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

7. 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

8. 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

10. 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

11. 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

12. 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

13. 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

14. 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 Threaded Collar Locking Ring Shield Plug Cover-to-Collar Weld Main Shell