May 10,2012

SBK-L-12104

DocketNo.50443

U.S. Nuclear Regulatory Commission

Attention: Document Conftol Desk

One White FlintNorth

11555 Rockville Pike

Rockville, MD 20852

Seabrook Station

$upplenneJt.Le Actionsifor Rgsqlu!!-qts.f Alkali Sjlisa-Reacli-on-(ASR) Issues

Reference:

1. Public Meeting between NextEra Energy Seabrook" LLC (NextEra Energy Seabrook) and

the u.s. Nuclear Regulatory commission, April 23,2012 (MI-121070659),

2. NextEra Energy Seabrook letter SBK-L-12098, "Actions for Resolution of Alkali Silica

Reaction (ASR) Issues," to NRC, dated May 3,20L2.

During the above referenced meeting, NextEra Energy Seabrook committed to the U.S. Nuelear

Regulatory Commission (NRC) to provide a list of aotions it is taking to resolve ASR issues at

Seabrook Station. NextEra Energy Seabrook provided the list of actions in Reference 2.ln a

subsequent conference call with the NRC on May 7,2012, NextEra Energy Seabrook committed

to providing supplementary information regarding the list of actions.

NextEra Energy Seabrook will take the following actions to resolve ASR at Seabrook Station:

1. Revise the prompt operability determination (POD) associated with AR581434, 'Reduced

Concrete Properties Below Grade in "Bo'Electrical Tunnel Exterior Wall,' by May 25,

2012. NextEra Energy Seabrook will notifr the site NRC Resident Inspector upon

completion of this action.

Revise the POD associated with AR16 64399, 'Reduced Concrete Modulus of Elastioity

Below Grade in Containment Enclosure Building, RHR Equipment Vaults, EFW Pump

House, and Diesel Generator Fuel Oil Storage Rooms,' by June 30,2012. The expanded

scope buildings will be included in this POD. NextEra Energy Seabrook will notiff the

site NRC Resident lnspector upon completion of this action.

NextEra Energy Seabrook, LLC, P,O. Box 300, Lafayette Road, Seabrook, NH 03874

)
United States Nuclear Regulatory Commission

SBK-L-I2104/ Page 2

3. Complete short term aggregate expansion testing (ASTM C 1260 Mortar Bar Expansion

Test) by June 30, 2012. Results will be available for NRC review approximately 30 days

after testing is complete.

4. Complete long term aggregate expansion testing (ASTM C 1293 Concrete Prism Test) by

June 30,2013. Results will be available forNRC review approximately 30 days after

testing is complete.

5. Submit the root cause for the organizational causes associated with the occunence of

ASR at Seabrook Station and related corrective actions by May 25,2012.

6. Submit the License Renewal Aging Management Program for ASR-affected structures by

May 25,2012.

Submit the evaluation, "Impact of ASR on Concrete Structures and Attachments,"

(Foreign Print 100716) by May 25,2012.

Submit the corrective action plan for the continued assessment of ASR in concrete

structures at Seabrook Station including development of remedial actions to rnitigate the

affects of ASR, where waranted, by June 8,2012.

9. Submit the technical details of the testing planned at the contracted research and

development facility by June 34,2012,

10. Update the Maintenance Rule Structures Monitoring Program to include monitoring

requirements for selected locations in areas that exhibit ASR by July 15, 2012. NextEra

Energy Seabrook will notiff the site NRC Resident Inspector upon completion of this

action.

11. Perform six-month interval crack measurements and crack indexing at 20 locations in

areas that exhibit the highest crack indices by July 15,2012. NextEra Energy Seabrook

will notifu the site NRC Resident Inspector upon completion of this action, Crack

measurement will be performed at six-month intervals until a reliable trend of ASR

progression is established.

12. Complete anchor test program by December 31, 2012. Results will be available for NRC

review approximately 30 days aftertesting is complete'

The dates identified above reflect NextEra's current plans and are subject to change based upon

testing conditions and other considerations. In the event that a date changes, NextEra will notiff

the NRC in writing.

Regulatory commitnents are listed in the attachrnent to this letter.

7.

8.
United States Nuclear Regulatory Commission

SBK-L-I2104/ Page 3

If you have any questions regarding this correspondence, please contact Mr. Michael O'Keefe,

Licensing Manager, at (603) 773-7745.

Sincerely,

NextEra Energy Seabrook, LLC

Paul O. Freeman

Site Vice President

cc:

W.M. Dean,

J. G. Lamb,

W. J. Raymond,

A.D. Cunanan,

M. Wentzel,

NRC Region I Administrator

NRC Project Manager, Project Direstorate I-2

NRC Resident lnspector

NRC Project Manager, License Renewal

NRC Project Manager, License Renewal

Mr. Christopher M. Pope

Director Homeland Security and Emergency Management

New Hampshire Department of Safety

Division of Homeland Security and Emergency Management

Bureau of Emergency Management

33 Hazen Drive

Concord, NH 03305

John Giamrsso, Jr., Nuclear Preparedness Manager

The Commonwealth of Massachusetts

Emergency Management Agency

400 Worcester Road

Framingham, MA 01702 -5399
Attachment to SBK-L-12104

List of Regulatory Commitments
Commitment

Number

Commitmeut Completion

Date

SBK-L-12098-01 Revise the prompt operability determination (POD)

associated with AR581434, 'Reduced Concrete

Properties Below Grade in "B" Electrical Tunnel

Exterior Wall.' NextEra Energy Seabrook will

notifu the site NRC Resident Inspector upon

completion of this action.

May 25,2412.

SBK-L-I2098-02 Revise the POD associated with AR1664399,

'Reduced Concrete Modulus of Elasticity Below

Grade in Containment Fnclosure Building RHR

Equipment Vaults, EFW Pump House, and Diesel

Generator Fuel Oil Storage Rooms.' The expanded

scope buildings will be included in this POD.

NextEra Energy Seabrook will notiff the site NRC

Resident Inspector upon completion of this action.

June 30,2012.

SBK-L-12098-03 Complete short term aggregate expansion testing

(ASTM C 1260 Mortar Bar Expansion Test).

Results will be available forNRC review

approximately 30 days after testing is complete.

Iune30,2012.

SBK-L-12098-04 Complete long term aggregate expansion testing

(ASTM C 1293 Concrete Prism Test).

Results will be available forNRC review

approximately 30 days after testing is complete.

June 30,2012.

SBK-L-12098-05 Submit the root cause for the orgarizational causes

associated with the occurtence of ASR at Seabrook

Station and related corrective actions.

May 25,2012.

SBK-L-12098-06 Submit the License Renewal Aging Management

Program for ASR-affected structures.

May 25,2Q12.
Commitment

Number

Commitment Completion

Date

SBK-L-I2098-07 Submit the evaluatiory "Impact of ASR on Concrete

Structures and Attachments," (Foreign Print

l0o7r6).

May25,2012.

SBK-L-12098-08 Submit the conective action plan for the continued

assessment of ASR in concrete structures at

Seabrook Station including development of remedial

actions to mitigate the affects of AS& where

warranted.

June 8, 2012.

SBK-L-12098-09 Submit the technical details of the testing planned at

the corrtracted research and development facility.

June 30,2012.

SBK-L-12098-10 Update the Maintenance Rule Structures Monitoring

Program to include monitoring requirements for

selected locations in areas that exhibit ASR.

NextEra Energy Seabrook will notify the site NRC

Resident Inspector upon completion of this action.

July 15,2012,

SBK-L-12098-11 Perform six-month interval crack measurements and

crack indexing at 20locations in areas that exhibit

the highest crack indices. NextEra Energy Seabrook

will notiff the site NRC Resident Inspector upon

completion of this action. Crack measurement will

be performed at six-month intervals until a reliable

trend of ASR progression is established.

July 75,2012.

SBK-L-12098-12 Complete anchor test program.

Results will be available forNRC review

approximately 30 days after testing is cornplete.

December 31,2012.