ML15233A035

July 20, 2015, Summary of Telephone Conference Call Held Between NRC and TVA Concerning RAI, Set 25 Pertaining to the Sequoyah Units 1 and 2 License Renewal Application

ML15233A035
Person / Time
Site:	Sequoyah
Issue date:	09/22/2015
From:	Phyllis Clark License Renewal Projects Branch 1
To:
Clark P, NRR/DLR, 415-6447
References
DLR-15-0414, TAC MF0481, TAC MF0482
Download: ML15233A035 (6)

Text

UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555-0001 September 22, 2015 LICENSEE:

Tennessee Valley Authority FACILITY:

Sequoyah Nuclear Plant, Units 1 and 2

SUMMARY

OF TELEPHONE CONFERENCE CALL HELD ON JULY 20, 2015, BETWEEN THE U.S. NUCLEAR REGULATORY COMMISSION AND TENNESSEE VALLEY AUTHORITY, CONCERNING REQUESTS FOR ADDITIONAL INFORMATION, SET 25 PERTAINING TO THE SEQUOYAH NUCLEAR PLANT, UNITS 1 AND 2 LICENSE RENEWAL APPLICATION (TAC NOS. MF0481 AND MF0482)

The U.S. Nuclear Regulatory Commission (NRC or the staff) and representatives of Tennessee Valley Authority (TVA or the applicant) held a telephone conference call on July 20, 2015, to discuss and clarify the staffs draft requests for additional information (DRAIs) provided in concerning the Sequoyah Nuclear Plant, Units 1 and 2, license renewal application.

The telephone conference call was useful in clarifying the intent of the staffs DRAIs.

provides a listing of the participants and Enclosure 2 contains the DRAIs discussed with the applicant, including a brief summary of the clarification discussion.

Sincerely,

/RA/

Phyllis Clark, Acting Project Manager Projects Branch 1 Division of License Renewal Office of Nuclear Reactor Regulation Docket Nos. 50-327 and 50-328

Enclosures:

1. List of Participants

2. Summary of Telephone Conference Call cc: Listserv

September 22, 2015 LICENSEE:

Tennessee Valley Authority FACILITY:

Sequoyah Nuclear Plant, Units 1 and 2

SUMMARY

OF TELEPHONE CONFERENCE CALL HELD ON JULY 20, 2015, BETWEEN THE U.S. NUCLEAR REGULATORY COMMISSION AND TENNESSEE VALLEY AUTHORITY, CONCERNING REQUESTS FOR ADDITIONAL INFORMATION, SET 25 PERTAINING TO THE SEQUOYAH NUCLEAR PLANT, UNITS 1 AND 2 LICENSE RENEWAL APPLICATION (TAC NOS. MF0481 AND MF0482)

The U.S. Nuclear Regulatory Commission (NRC or the staff) and representatives of Tennessee Valley Authority (TVA or the applicant) held a telephone conference call on July 20, 2015, to discuss and clarify the staffs draft requests for additional information (DRAIs) provided in concerning the Sequoyah Nuclear Plant, Units 1 and 2, license renewal application.

The telephone conference call was useful in clarifying the intent of the staffs DRAIs.

provides a listing of the participants and Enclosure 2 contains the DRAIs discussed with the applicant, including a brief summary of the clarification discussion.

Sincerely,

/RA/

Phyllis Clark, Acting Project Manager Projects Branch 1 Division of License Renewal Office of Nuclear Reactor Regulation Docket Nos. 50-327 and 50-328

Enclosures:

1. List of Participants

2. Summary of Telephone Conference Call cc: Listserv DISTRIBUTION:

See next page ADAMS Accession Number: ML15233A035

• Concurred via e-mail OFFICE LA:DLR*

PM:RPB1:DLR PM:RPB1:DLR BC:RPB1:DLR PM:RPB1:DLR NAME YEdmonds PClark ESayoc YDiaz-Sanabria PClark DATE 09/ 02 /15 09/ 09 /15 09/ 09 /15 09/ 11 /15 09/ 22 /15 OFFICIAL RECORD COPY

Memo to Tennessee Valley Authority from P. Clark dated September 22, 2015

SUMMARY

OF TELEPHONE CONFERENCE CALL HELD ON JULY 20, 2015, BETWEEN THE U.S. NUCLEAR REGULATORY COMMISSION AND TENNESSEE VALLEY AUTHORITY, CONCERNING REQUESTS FOR ADDITIONAL INFORMATION, SET 25 PERTAINING TO THE SEQUOYAH NUCLEAR PLANT, UNITS 1 AND 2 LICENSE RENEWAL APPLICATION (TAC NOS. MF0481 AND MF0482)

DISTRIBUTION:

HARD COPY:

DLR RF E-MAIL:

PUBLIC RidsNrrDlr Resource RidsNrrDlrRpb1 Resource RidsNrrDlrRpb2 Resource RidsNrrDlrRerb Resource RidsNrrDlrRarb Resource RidsNrrDlrRasb Resource RidsNrrPMSequoyah Ressource A. Boland, NRR/DORL/DIR J. Trapp, NRR/DORL/ADDIR J. Danna, NRR/DLR/RPB2 E. Sayoc, NRR/DLR/RPB1 D. Drucker, NRR/DLR/RPB2 S. Helton, NRR/DORL/LPL2-2 A. Hon, NRR/DORL/LPL2-2 A. Gody, RII/DRS/DIR S. Walker, RII/DRS/EB3 A. Blamey, RII/DRP/RPB6 G. Smith, RII/DRP/RPB6 W. Deschaine, RII/DRP/RPB6 J. Pelchat, RII/Sr Regional Gov't Liaison Officer E. Lea, RII/Regional Govt Liaison Officer D. Decker, OCA R. Hannah, OPA/PA-RII J. Ledford, OPA/PA-RII

ENCLOSURE 1 TELEPHONE CONFERENCE CALL SEQUOYAH NUCLEAR PLANT, UNITS 1 AND 2 LICENSE RENEWAL APPLICATION LIST OF PARTICIPANTS July 20, 2015 PARTICIPANTS AFFILIATION Phyllis Clark U.S. Nuclear Regulatory Commission (NRC)

Yoira Diaz-Sanabria NRC Dennis Morey NRC Allen Hiser NRC Seung Min NRC James Medoff NRC John Daily NRC Erin Henderson Tennessee Valley Authority (TVA)

Mike McBrearty TVA Don Goodin TVA Dennis Lundy TVA Terry Woods TVA Dave Lafever TVA Josh McKinley Westinghouse Eric Benacquista WH Charles Meyer WH

ENCLOSURE 2

SUMMARY

OF TELEPHONE CONFERENCE CALL SEQUOYAH NUCLEAR PLANT, UNITS 1 AND 2 LICENSE RENEWAL APPLICATION July 20, 2015 The U.S. Nuclear Regulatory Commission (NRC or the staff) and representatives of Tennessee Valley Authority (TVA or the applicant) held a telephone conference call on July 20, 2015, to discuss and clarify the following draft requests for additional information (DRAIs) concerning the Sequoyah Nuclear Plant, Units 1 and 2 license renewal application (LRA).

RAI 3.0.3.2.17-1a (Surveillance Capsule Operating Experience Followup) (Agencywide Documents Access and Management System (ADAMS) Accession No. ML15159B164)

Background:

During Refueling Outage No. 20 at Sequoyah Nuclear Plant (SQN), Unit 1, inservice inspections of the reactor vessel internals (RVI) revealed that two reactor pressure vessel (RPV) surveillance capsules had become dislodged from their baskets and that capsule pieces or specimens from at least one of these capsules had become loose inside the Unit 1 RPV.

Apparent damage to some RVI components was noted by TVA.

Issue:

Any damage to RVI components should be assessed to demonstrate that stress profiles for the damaged components remains bounded by those assumed for the as-built component configurations in the applicable Materials Reliability Program (MRP) reports; this is regardless of whether the damage was induced by an age-related aging effect.

In addition, the staff is concerned that any damage that occurred from the impacts of the loose parts (e.g., causing cold work to the affected components) could create a preferential site for initiation of degradation, such as stress corrosion cracking, during the period of extended operation. Evaluation should adequately address the use of future examinations of the damaged locations using inspection methods that will address this issue.

Request:

1. Provide an adequate technical justification for not considering the potential effects of loose part-induced cold work on the likelihood of degradation of the damaged reactor internals, in particular the long term prospects for initiation of stress corrosion cracking in the damaged internals.

2. Provide a basis for not performing subsequent re-inspections of the damaged locations of the Unit 1 reactor internals using inspection methods that will effectively address impact-related damage.

Discussion:

The staff clarified that superficial scratches or surface abrasion are not the concern. Qualitative and quantitative information may be needed for components with deep scratches. In addition, the staff clarified that discussions on inspections and monitoring for possible future damage from remaining loose parts. The staff also clarified that the updated final safety analysis report supplement (Licensing Renewal Application Section A.1.35) should be consistent with Commitment No. 28.

The revised due date for the response to the draft Request for Additional Information (RAI) is August 3, 2015.