safety and licensing of spent fuel storage facilities vonna ordaz, u.s. nrc presented at...
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Safety and Licensing of Spent Fuel Storage Facilities
Vonna Ordaz, U.S. NRC
Presented at
International Conference on Management of
Spent Fuel from Nuclear Power ReactorsJune 1, 2010
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2
NRC Dry Storage Program
• Specific License
• General License
– Dry Cask Certification
• Review Guidance
– Standard Review Plan for Dry Cask Storage
– Standard Review Plan for Dry Storage Facilities
– Interim Staff Guidance Documents
– Regulatory Guides
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3
Chemical Interactions
• Point Beach hydrogen ignition event
• Trojan pool turbidity
• First time use of materials and processes
– Thorough engineering evaluation
– Consider testing prior to use
• Share information and think broadly
• NRC developed Materials Review chapter for Standard Review plans
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4
Light-Weight Transfer Cask
• Removed most water prior to lid welding
• Higher fuel temperature at start of vacuum drying
• Invalidated design-basis calculation for maximum time allowed for vacuum drying
• Drafting new Interim Staff Guidance document on Health Physics
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5
Damaged Fuel Assessment
• Fuel must be retrievable after dry storage
• Visual inspection of fuel proved ineffective
• Fuel stored in non-oxidizing atmosphere
• Testing to determine fuel state
– Spent fuel sipping
– Reactor off-gas release rate test
– Ultrasonic inspection
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6
Damaged Fuel AssessmentLessons Learned
• Revision to ISG-2, “Retrievability“
– Added assembly retrievability
– Handling by normal means
– Remain structurally sound
– In secondary canister if assembly cannot be shown to be undamaged
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7
ISFSI License Renewals
• 20-year license term with renewals
• Initial two licenses issued in 1986 and third in 1990
• Perform aging management review
• Lessons learned from license renewals
– Developed rulemaking to increase the licenses and certificates to 40 years
– Developed Standard Review Plan for Renewal of Independent Spent Fuel Storage Installation Licenses and Dry Cask Storage System Certificates of Compliance”
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Revisiting the Paradigm for Storage and Transport
• SRM-COMDEK-09-0001
• Thorough review of spent fuel storage and transport regulatory programs
– Research needed to bolster the technical bases
– Risk-informed and performance-based methods
– Incentives to industry to use state-of-the-art technology
– Harmonizing with international standards
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Conclusions
• Strive for continuous improvement
• Review methods and guidance are not stagnant
• Changes to guidance come from experiences
• Staff Requirements Memorandum - Revisiting the Paradigm on Spent Fuel Storage and Transport (SRM-COMDEK-09-0001)