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Earl Easton
Division of Spent Fuel Storage and Transportation
U.S. Nuclear Regulatory Commission
Dry Cask Storage
of Nuclear Spent Fuel
2
U.S. Commercial Nuclear
Power Plants
3
Commercial Nuclear Power
Generation
4
Current Expiration Dates for
existing Reactor Licenses
5
Proposed New Nuclear Power Plants
6
Existing Commercial Spent Fuel
Storage Facilities
7
Spent Fuel Storage by State
Spent Fuel Storage by State
Impacts Associated with Transfer of Spent Nuclear Fuel from Spent Fuel Storage
Pools to Dry Storage After Five Years of Cooling, EPRI 11/10
SOURCE:
Spent Fuel Storage over Time
Spent Fuel Management
Current practice is to move
fuel to dry storage when
reactor storage pools become
filled.
Spent Fuel Storage Casks
12
Preparation of Empty
Canister
13
Fuel Loading in Transfer Cask
Welding of Canister Lid
15
Transfer of Canister
into Overpack
16
Transfer of Overpack to
ISFSI Pad
Storage Cask Array on
ISFSI Pad
NAC MPC Dual-Purpose Canister System
Connecticut Yankee ISFSI
Susquehanna Dry Cask
Storage
Susquehanna uses a horizontal storage module, a Transnuclear model
NUHOMS 52-B. Note the transporter and alignment of the transport cask so
that the canister containing the spent nuclear fuel can be pushed into the
storage module by a hydraulic ram.
Impacts Associated with Transfer of Spent Nuclear Fuel from Spent Fuel Storage Pools
to Dry Storage After Five Years of Cooling, EPRI 11/10
SOURCE:
Evolving Spent Fuel
Management Program
• Blue Ribbon Commission on America’s
Nuclear Future
• Revising the Paradigm on Spent Fuel
storage
• Waste Confidence Decision
BRC Recommendations
• DOE or FEDCORP may submit an
application for a dry cask storage facility
to NRC - focused on orphan sites?
• Proceeding could be similar to Private
Fuel Storage Application
22
Revising the Paradigm Program goals
• Technical basis and regulating long-term storage (100+ years)
• Transition to risk-informed and performance-based regulation
• Evaluate spent fuel storage and transport regulations
• Address issues with transporting very old fuel
• Cradle to grave view including stakeholder input
• Near-Term
– Evaluate key aging issues important for eventual transportation
– Identify issues requiring further research (e.g. high burnup fuel)
• Long-term
– Demonstration program
– Known condition of spent fuel consistent with transportation requirements
Revising the Paradigm Propose evaluations
Example: Cladding Integrity
• Safety Functions
– Primary fission product barrier
– Geometry control
– Defense in Depth
• Technical Challenges
– Higher burnup levels
– Temperature effects
– New cladding types
– In-situ monitoring in sealed
canisters 25
Example: Canister Integrity
• Safety Functions
– Confinement
– Inert environment
– Criticality control
• Technical Challenges
– Long-term corrosion
– Basket properties
– Absorber efficiency
– Monitoring sealed internals
26
Example: Overpack
Performance
• Safety Functions
– Shielding
– Heat transfer
– Robustness against severe
events
• Technical Challenges
– Long-term degradation
– Response to external natural
events and external disruption
27
Waste Confidence Rule
28
29
Waste Confidence Rule
Waste Confidence Rule
31
Waste Confidence Rule
- Schedule
Questions ?
32