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

Drop Testing Update - MCO and 24-Inch ISFP Test Canisters. T. J. Hill / NSNFP Technical Lead. April 2005. 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:

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

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  1. Drop Testing Update -MCO and 24-Inch ISFP Test Canisters T. J. Hill / NSNFP Technical Lead April 2005

  2. 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)

  3. MCO 23-ft Drop Test

  4. 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

  5. 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)

  6. MCO Internal Helium Contamination

  7. ISFP Test Canister Deformations • Good analysis matches to actual deformations and strains • Typically within 4% on deformations • Good matches with measured strains

  8. ISFP Test Canister Deformations - cont. • No internal sleeves were used • Localized “bumps” in shell due to internals • Analysis accurately predicted these deformations within 2%

  9. MCO Test Canister Deformations - cont. • Good analysis matches to very small actual deformations and strains

  10. ISFP Test Canister Internals • No significant damage to ISFP internals

  11. MCO Test Canister Internals • Only MCO-00-1 was cut open and only bottom basket was of interest ComponentOriginal DimensionPost-Drop DimensionModel Predicted Dimension Center 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. Basket cuts are from canister cutting efforts

  12. 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

  13. 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

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