April 2005

T. J. Hill / NSNFP Technical Lead

Drop Testing Update -MCO and 24-Inch ISFP Test Canisters

Drop Test Efforts

• Two 24-Inch Idaho Spent Fuel Project (ISFP) test canisters (modified versions of the standardized DOE SNF canister design) dropped 30 feet:

– 45-degree impact (24MOD-45-1)

– 70-degree impact for slapdown (24MOD-70-2)

• Two MCO test canisters dropped using repository drop criteria from WASRD, Rev 4:

– 23-foot vertical drop (MCO-00-1)

– 2-foot 60-degree (worst orientation) drop (MCO-60-2)

MCO 23-ft Drop Test

Pressure Testing – Post Drop

• Two ISFP test canisters (24MOD-45-1 and 24MOD-70-2)

– Held greater than 50 psig air steady for 1 hour• Two MCO test canisters (MCO-00-1 and MCO-60-2)

– Held greater than 50 psig air steady for 1 hour

Helium Leak Testing – Post Drop• Two ISFP test canisters (24MOD-45-1 and 24MOD-70-2)

– Helium leak tested less than 1x10-7 std cc/sec (leaktight)

• Two MCO test canisters (MCO-00-1 and MCO-60-2)

– MCO-00-1 not greater than 1x10-5 std cc/sec (alternate test method due to prior internal helium contamination)

– MCO-60-2 less than 1x10-7 std cc/sec (leaktight)

MCO Internal Helium Contamination

ISFP Test Canister Deformations• Good analysis matches to actual deformations and strains

– Typically within 4% on deformations

– Good matches with measured strains

ISFP Test Canister Deformations - cont.• No internal sleeves were used

• Localized “bumps” in shell due to internals

• Analysis accurately predicted these deformations within 2%

MCO Test Canister Deformations - cont.• Good analysis matches to very small actual

deformations and strains

ISFP Test Canister Internals

• No significant damage to ISFP internals

MCO Test Canister Internals

Component Original Dimension Post-Drop Dimension Model Predicted DimensionCenter Post Length 29.278-in. 25-1/8-in. 25-5/16-in.Center Post Diameter 2.840-in. 3.047-in. 3.025-in.

• Only MCO-00-1 was cut open and only bottom basket was of interest

Basket cuts are from canister cutting efforts

MCO Test Canister Contamination

• Radioactivity readily measured once top end of test MCO-00-1 cut off (tape applied after cutting open to prevent potential spread of contamination from holes)

• Disposed as low level waste at INL with less than 0.5 mr/hr reading

Conclusion

• NSNFP issued two reports

– EDF-NSNF-045 for ISFPs

– EDF-NSNF-047 for MCOs

• NSNFP has demonstrated these DOE SNF canisters will not breach during repository defined drop events