ML17164A271

Presentation Slides for Annual Assessment Meeting 2017

ML17164A271
Person / Time
Site:	Seabrook
Issue date:	06/07/2017
From:	NRC Region 1
To:
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Download: ML17164A271 (9)

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1 Seabrook Annual Assessment Meeting & Update on ASR-impacted Concrete Nuclear Regulatory Commission - Region I Hampton, NH June 7, 2017

2 NRC Staff

• Jimi Yerokun, Deputy Director, DRS - Region I

• Mel Gray, Branch Chief, DRS - Region I

• Brian Wittick, Branch Chief, NRR

• Justin Poole, Project Manager, NRR

• Paul Cataldo, NRC Sr. Resident Inspector

3 AGENDA

• 2016 Safety Performance Overview

• NRC Inspections of ASR-impacted concrete

• ASR License Amendment Request

• License Renewal Status

• Question and Answer Session

• Closing Remarks

4 Seabrook 2016 Safety Performance Overview Safety Assessment Summary

• Operated safely and in a manner that preserved the public health and safety and protected the environment

• Licensee Response Column

• 6,700 hours0.0081 days <br />0.194 hours <br />0.00116 weeks <br />2.6635e-4 months <br /> of inspection and related activities

• All Green Findings and Performance Indicators

• 1 Severity Level (SL) III violation issued which stemmed from a security incident in August 2015

NRC Inspections of ASR-impacted Concrete What is ASR?

• ASR has been identified in localized areas of Seabrook concrete structures

• ASR is a chemical reaction in concrete, which occurs over time in the presence of water, between the alkaline cement and reactive silica found in some aggregates.

• ASR forms a gel that expands causing micro-cracks that effect concrete material properties 5

6 NRC Inspections of ASR-impacted Concrete Inspection Summary

• NRC issued a violation in 2016 for not evaluating ASR effects of bulk deformation in Containment Enclosure Building and Underground Equipment Vault Wall Cracks o Violation of very low safety significance because structural capability was maintained o NRC completed inspection in October 2016 to confirm effectiveness of actions to prevent recurrence

• NRC specialist inspections completed every six months; one ongoing this week

7 ASR License Amendment Request (LAR)

On June 15, 2016, public meeting held - NextEra presented its plan for revising the licensing basis for concrete structures at Seabrook impacted by ASR On August 1, NextEra submitted a License Amendment Request (LAR) to revise the current licensing basis -

Requested approval of a methodology to analyze seismic Category I concrete structures.

Application was formally accepted on October 12.

Application is currently under NRC staff review -

Expected to take until August 2018.

8 License Renewal Application (LRA) Review Status NextEra submitted a license renewal application (LRA) in June 2010 License renewal safety review is ongoing; NRC decision on the application has not been finalized Reasonable assurance that aging effects of ASR on concrete can be adequately managed is needed Remaining schedule milestones, including 2nd ACRS Subcommittee meeting, are to be determined

NRC Social Media Channels

• Web:

http://www.nrc.gov/

• Blog:

http://public-blog.nrc-gateway.gov/

• Flickr:

http://www.flickr.com/photos/nrcgov/

• Twitter:

https://twitter.com/#!/nrcgov

• YouTube: http://www.youtube.com/user/NRCgov

• Questions?

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