nrc public meeting public meeting davis besse shield building cracks january 5, 2012

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



Welcome

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yn a e ersonActing Regional Administrator

NRC Region III



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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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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Meeting Information

Kenneth O’Brien

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epu y rec or, v s on oReactor Safety

NRC Region III



Meeting Agenda

• Introductions

• Background

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• Licensee Presentation

• NRC Inspection & Conclusion

• Additional NRC Safety Actions

• Summary

• Public Questions and Comments



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



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



NRC Inspection &Conclusions

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David Hills

Engineering Branch Chief NRC Region III



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 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.




• 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 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


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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


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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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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



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.



Summary

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ynt a e ersonActing Regional Administrator

NRC Region III



• 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.

nrc public meeting public meeting davis besse shield building cracks january 5, 2012

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