doe snf canister planned activities

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

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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. - PowerPoint PPT Presentation

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Page 1: DOE SNF Canister Planned Activities

November 9, 2005

Thomas Hill, NSNFP

DOE SNF Canister Planned Activities

Page 2: DOE SNF Canister Planned Activities

Limited Canister Analysis Planned

• Canister basket design

• Canister dynamic material properties verifications

• Transportation accident response

Page 3: DOE SNF Canister Planned Activities

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.

Page 4: DOE SNF Canister Planned Activities

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

Page 5: DOE SNF Canister Planned Activities

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

Page 6: DOE SNF Canister Planned Activities

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

Page 7: DOE SNF Canister Planned Activities

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

Page 8: DOE SNF Canister Planned Activities

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

Page 9: DOE SNF Canister Planned Activities
Page 10: DOE SNF Canister Planned Activities

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

Page 11: DOE SNF Canister Planned Activities

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

Page 12: DOE SNF Canister Planned Activities

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

Page 13: DOE SNF Canister Planned Activities

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

Page 14: DOE SNF Canister Planned Activities

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 CollarLocking RingShield Plug

Cover-to-Collar Weld

Main Shell