independent spent fuel storage installation (isfsi) dry cask storage nucp 2311 1
TRANSCRIPT
Independent Spent Fuel Storage Installation (ISFSI)
Dry Cask StorageNUCP 2311
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History• 1982 Congress Passed
Nuclear Waste Policy Act
• Spent Fuel Pools near Capacity
• 1st Dry Storage System licensed in 1986 at Surry Power Station
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History• 27 Dry Storage Sites (as of March 2003)
• Licensed at Reactor Sites• 1 Licensed for TMI-2 Fuel Debris
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Licensing
• 10CFR72– Dry Storage Casks• Designs Approve by NRC• Currently 15 in use (as of December 2004)
– Independent Spent Fuel Storage Installation (ISFSI)• Site-Specific• General
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Licensing – Dry Storage Casks
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Licensing – Dry Storage Casks• Licenses (one or both)– Storage– Transport
• Specifications– 17 feet height– 180,000 lbs. (230,000 lbs. fully-loaded)– Holds 30 – 60 fuel assemblies
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Licensing – Dry Storage Casks
• Maximum Burnup 60 MWD/MTU (most around 45 MWD/MTU)
• Minimum Decay time in SFP:5 – 10 years
• 20 – 30 kW thermal (depends on size)• Maximum Enrichment 5%
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Licensing – Dry Storage Casks• Typical Materials– Structural• Carbon Steel• Stainless Steels• Concrete
– Shielding• Borated Resin• Borated Aluminum• Lead
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Licensing – Dry Storage Casks
• Mother Nature– Wind / Tornados– Missiles (trees, telephone poles)– Snow and Ice– Earthquakes
• Accidents– Cask Tip-over– Cask Drop– Fire– Loss of Cooling (vents blocked)
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Licensing – ISFSI Pad• Example Pad
(At Indian Point Energy Center)
– 3 feet thick– 100 x 200 feet– 21 miles of rebar– 2000 cubic yards of
concrete
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Licensing – ISFSI Vaults• Pre-made concrete
structures• Assembled on-site
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Dry Storage Casks - Types
CASTOR – General Nuclear Systems, Inc.
NAC – NAC International, Inc.
NUHOMS – Transnuclear, Inc.
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Dry Storage Cask - SFP
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Dry Storage Casks - Loading
• Loading Cask in SFP
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Dry Cask Storage - Loading• Remove water and fill with Inert gas• Bolt and Weld Lid
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Dry Cask Storage - Transportation• Load onto Cask
Transporter
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Dry Cask Storage - Transportation
• Place on Cask Pad or in Vault
Above Ground Storage of SNF
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Dry Cask Storage - Transportation
• Transport off-site– Train, Barge, and Truck
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ISFSI Summary
• ISFSI is a good temporary disposal method• New casks designs can be safely transported
to Yucca Mountain• New cask designs can handle high-burnup fuel