nrc public meeting public meeting davis besse shield building cracks january 5, 2012
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8/3/2019 NRC Public Meeting Public Meeting Davis Besse Shield Building Cracks January 5, 2012
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Davis Besse Shield Building CracksJanuary 5, 2012
8/3/2019 NRC Public Meeting Public Meeting Davis Besse Shield Building Cracks January 5, 2012
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Welcome
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yn a e ersonActing Regional Administrator
NRC Region III
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NRC Safety Mission
• The Nuclear Regulatory Commission (NRC)is an independent federal agency created
y . . ongress.• The mission of the NRC is to license and
regulate the Nation’s civilian use of
nuclear materials in order to protect publichealth and safety, promote the commondefense and security, and protect theenvironment.
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8/3/2019 NRC Public Meeting Public Meeting Davis Besse Shield Building Cracks January 5, 2012
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8/3/2019 NRC Public Meeting Public Meeting Davis Besse Shield Building Cracks January 5, 2012
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Meeting Purpose
• Inform the public about the safety of the
Davis Besse shield building through:
- A presentation by the licensee on theresults of their tests and analysis.
- A presentation by the NRC on the NRC’s
inspection of the shield building and
actions taken to ensure safety.
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8/3/2019 NRC Public Meeting Public Meeting Davis Besse Shield Building Cracks January 5, 2012
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Meeting Information
Kenneth O’Brien
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epu y rec or, v s on oReactor Safety
NRC Region III
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Meeting Agenda
• Introductions
• Background
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• Licensee Presentation
• NRC Inspection & Conclusion
• Additional NRC Safety Actions
• Summary
• Public Questions and Comments
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Introductions - NRC
• Cynthia Pederson, Acting Regional Administrator,Region III
• Kenneth O’Brien, Deputy Director, Division of Reactor Safet
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• Patrick Hiland, Director, Division of Engineering, Officeof Nuclear Reactor Regulation
• David Hills, Chief, Engineering Branch 1
• Jamnes Cameron, Chief, Reactor Projects Branch 6
• Daniel Kimble, Senior Resident Inspector
• Adam Wilson, Resident Inspector
• Jared Heck, Meeting Facilitator
8/3/2019 NRC Public Meeting Public Meeting Davis Besse Shield Building Cracks January 5, 2012
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Meeting Contacts
• Followup Questions - Contact the
NRC Region III Office of Public
Affairs / Viktoria Mitlyng / PremaChandrathil 630-829-9500
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First Energy Nuclear
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(FENOC) Introductions
and Presentation
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NRC Inspection &Conclusions
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David Hills
Engineering Branch Chief NRC Region III
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NRC Safety Focused Inspection
• At discovery of cracking, NRCinspectors already onsite inspecting
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replacement.
• Added extra NRC structural expertise.
• Approximately 10 NRC engineersinvolved during the almost 8 weektime period.
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NRC Safety Focused Inspection
• NRC inspectors onsite independentlyobserved and evaluated licensee’s
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ac v es o e erm ne e ex en ocracking.
• NRC structural engineers performedextensive, independent, & rigorousreview of the licensee’s analysisincluding structural calculations.
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NRC Safety Focused Inspection
• The NRC team engaged the licensee’sengineers and consultants in intense
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licensee’s actions and analysis.
• Numerous technical questions were
posed and answered – some inwriting/many verbally.
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NRC Safety Focused Inspection
• NRC questions resulted in additionallicensee actions to determine the
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of more extensive/detailed structuralcalculations.
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• The licensee performed impulseresponse mapping and confirmatory
NRC Conclusion Basis
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cracking.
• Structural calculations reflected extent
of cracking that was verified throughtesting.
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• Licensee calculation assumptions andengineering judgments were
NRC Conclusion Basis
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.• Calculation modeling adequately
reflected the building condition
including structural load path.
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• The licensee evaluated the shield building’s
ability to withstand the design basis
NRC Conclusion Basis
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, ,
missiles.
• The licensee’s calculations confirmed that
building stresses remained within limits setin the original licensing basis.
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8/3/2019 NRC Public Meeting Public Meeting Davis Besse Shield Building Cracks January 5, 2012
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Shield building remains capable of
NRC Safety Conclusion
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per orm ng s sa e y unc on esp e e
cracking and therefore licensee could safely
restart plant.
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• NRC structural engineers continue in their evaluation of whether the shield building
meets licensin commitments. If NRC
NRC Safety Conclusion
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concludes commitments are not met, thenlicensee will need to correct.
• NRC inspection team is evaluating licensee’s
ongoing root cause activities and
determination of longer term corrective
actions.
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Additional NRC Safety
Actions
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amnes ameronChief, Reactor Projects Branch 6
NRC Region III
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Additional NRC Actions to Ensure Continued
Safety of the Shield Building
Confirmatory Action Letter issued on December 2, 2011 –
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,
and implement corrective actions, including a long-term monitoring program.
• Licensee to implement a short-term monitoringprogram.
NRC will conduct a followup inspection of root cause
evaluation and proposed corrective actions.
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Summary
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ynt a e ersonActing Regional Administrator
NRC Region III
8/3/2019 NRC Public Meeting Public Meeting Davis Besse Shield Building Cracks January 5, 2012
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• NRC structural engineers conducted an
extensive, independent, and rigorousevaluation.
•
Summary
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capable of performing its safety function.
• NRC determined that plant safety was notcompromised. NRC has taken actions to
ensure the plant remains safe going forward.
• NRC has continued to communicate to themedia, public officials, and members of thepublic.