ML19042A110

Presentation Slides - 2019 Seabrook Public Meeting

ML19042A110
Person / Time
Site:	Seabrook
Issue date:	02/13/2019
From:	William Burton NRC/NRR/DMLR/MRPB
To:
Burton W, DMLR/MRPB, 415-6332
References
Download: ML19042A110 (10)

Text

Seabrook Station, Unit No. 1 Alkali-Silica Reaction (ASR) License Amendment Request (LAR) and License Renewal Application (LRA)

Public Meeting February 13, 2019

Agenda

• Status of NRC Activities

• Alkali Silica Reaction

• Next Actions

• Discussion

• Closing Remarks

• Adjourn 2

Licensing Timeline (Renewed License)

LRA Submitted LAR Submitted LRA SER Issue Renewed License Hearing on LAR 3

LRA Updated 2010 Aug 2016 Sep 2018 Late 2018 Early 2019 Mid-to-Late 2019 ACRS Meetings and Letters LAR Draft SE (Current License)

Issue Amendment

ASR

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

• The expansion can cause various material impacts

• ASR is a very slow moving phenomenon 4

ASR at Seabrook

• Indications of ASR identified in 2010

- NRC has continued to verify safe operation at Seabrook

- ASR progresses slowly

• Original license did not consider ASR

• LAR and LRA would address ASR for the current license and renewed license terms 5

ASR License Amendment Request

• Detailed methodology for evaluating ASR-affected structures

• Based on large-scale testing program

• Monitoring ensures timely corrective action 6

License Renewal Application

• Aging management programs (AMPs) identify and manage future effects of aging

• LRA supplemented to include ASR Monitoring Programs as AMPs

• ASR AMPs adequately manage the effects of aging due to ASR 7

Issuance of the Licensing Actions

• Planned early 2019

• Meet the NRCs safety regulations

• NRC will adopt any required changes that result from the hearing process 8

Publicly Available Documents

• Available at https://adams.nrc.gov/wba/

• ASR license amendment request

- NRC staff draft safety evaluation: ML18226A205

- ACRS letter: ML18348A951

• License renewal application

- NRC staff safety evaluation report: ML18362A370

- ACRS letter: ML18353A954

• Information on Concrete Degradation

- https://www.nrc.gov/reactors/operating/ops-experience.html

• Seabrook License Renewal

- https://www.nrc.gov/reactors/operating/licensing/renewal/appl ications.html 9

Licensing Timeline (Renewed License)

LRA Submitted LAR Submitted LRA SER Issue Renewed License Hearing on LAR 10 LRA Updated 2010 Aug 2016 Sep 2018 Late 2018 Early 2019 Mid-to-Late 2019 ACRS Meetings and Letters LAR Draft SE (Current License)

Issue Amendment