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April 2005
T. J. Hill / NSNFP Technical Lead
Drop Testing Update -MCO and 24-Inch ISFP Test Canisters
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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)
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MCO 23-ft Drop Test
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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
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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)
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MCO Internal Helium Contamination
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ISFP Test Canister Deformations• Good analysis matches to actual deformations and strains
– Typically within 4% on deformations
– Good matches with measured strains
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ISFP Test Canister Deformations - cont.• No internal sleeves were used
• Localized “bumps” in shell due to internals
• Analysis accurately predicted these deformations within 2%
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MCO Test Canister Deformations - cont.• Good analysis matches to very small actual
deformations and strains
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ISFP Test Canister Internals
• No significant damage to ISFP internals
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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
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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
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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