ML17164A271

Presentation Slides for Annual Assessment Meeting 2017

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

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

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 2

AGENDA

• 2016 Safety Performance Overview

• NRC Inspections of ASR-impacted concrete

• ASR License Amendment Request

• License Renewal Status

• Question and Answer Session

• Closing Remarks 3

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 4

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

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 6

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.

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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 8

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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