ML13154A368

Request for Additional Information Regarding Reactor Pressure Vessel Surveillance Capsule Withdrawal Schedule Revision

ML13154A368
Person / Time
Site:	Sequoyah
Issue date:	06/04/2013
From:	Siva Lingam Plant Licensing Branch II
To:	James Shea Tennessee Valley Authority
Lingam S NRR/DORL/LPL2-2
References
TAC MF0631, TAC MF0632
Download: ML13154A368 (4)

Text

UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555-0001 June 4, 2013 Mr. Joseph W. Shea Vice President, Corporate Nuclear Licensing Tennessee Valley Authority 3R Lookout Place 1101 Market Street Chattanooga, TN 37402-2801

SUBJECT:

SEQUOYAH NUCLEAR PLANT, UNITS 1 AND 2 - REQUEST FOR ADDITIONAL INFORMATION REGARDING REACTOR PRESSURE VESSEL SURVEILLANCE CAPSULE WITHDRAWAL SCHEDULE REVISION (TAC NOS. MF0631 AND MF0632)

Dear Mr. Shea:

By letter dated January 10, 2013, you submitted an application for the U.S. Nuclear Regulatory Commission (NRC) approval of a revision to the reactor vessel surveillance specimen withdrawal schedule pursuant to Title 10 of the Code of Federal Regulations (10 CFR), Part 50, Appendix H,Section III.B.3 for Sequoyah Nuclear Plant, Units 1 and 2.

The NRC staff is reviewing the submittal and has determined that additional information is required to complete its evaluation. This request was discussed with Mr. Henry Lee of your staff on June 3, 2013, and it was agreed that a response would be provided within 30 days from the date of this letter.

If you have any questions regarding this matter, I can be reached at 301-415-1564.

Sincerely,

~ (f. ~~

Siva P. Lingam, Project Manager Plant Licensing Branch 11-2 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket No. 50-327 and 50-328

Enclosure:

Request for Additional Information cc w/encl: Distribution via Listserv

REOUEST FOR ADDITIONAL INFORMATION REGARDING REACTOR PRESSURE VESSEL SURVEILLANCE CAPSULE WITHDRAWAL SCHEDULE REVISION DUE TO LICENSE RENEWAL AMENDMENT SEOUOYAH NUCLEAR PLANT, UNITS 1 AND 2 DOCKET NOS. 50-327 AND 50-328 By letter dated January 10, 2013 (Agencywide Documents Access and Management System Accession No. ML130320295), the Tennessee Valley Authority, submitted an application for the U.S. Nuclear Regulatory Commission (NRC) approval of a revision to the reactor vessel surveillance specimen withdrawal schedule pursuant to Title 10 of the Code of Federal Regulations, Part 50, Appendix H,Section III.B.3 for Sequoyah Nuclear Plant (SON), Units 1 and 2. This change is necessary as a result of the license renewal amendment. In order to complete its review of the above documents, the NRC staff needs the following additional information:

RAI1 Issue: The American Society for Testing and Materials [ASTM] E 185-70 standard practice describes the withdrawal schedule in terms of the target fluence. The requested revision is written in terms of effective full power years (EFPY) instead of target fluence.

Request: Describe the withdrawal schedule (Tables 1 through 4) in terms of the fast neutron fluence (E> 1 million electron volts) in addition to the EFPY.

RAI2 Request: Provide a list of all materials included in Capsule S that the licensee plans to withdraw during the 28th refueling outage (RFO) for Unit 1 and the 29th RFO for Unit 2 along with any sister plants that could also use the test results from Capsule S. Do the remaining standby capsules contain the same materials that are found in Capsule S7 If the answer is no, provide a list of all materials included in the standby capsules.

RAI3 Issue: Regarding the proposed new capsule schedule, the NRC staff noted that the licensee included WCAP-17539-NP, Revision 0, "Sequoyah Units 1 and 2 Time-Limited Aging Analysis on Reactor Vessel Integrity," March 2012, which addresses the applicant's technical bases for surveillance capsule schedule changes for the extended operation period. The NRC staff noted that Tables 7-1 and 7-2 list the fast neutron fluence values of the withdrawn surveillance capsules (T, U, X, and Y) for SON, Units 1 and 2, respectively. However, these capsule fluence values are different from the capsule fluence values described in the applicant's previous capsule analysis reports such as WCAP-15224, Revision 0 and WCAP-15320, Revision O. For Enclosure

-2 example, the fast neutron fluence of Unit 1 Capsule Y reported in WCAP-17539-NP, 1.97E+19 neutrons (n)/centimete~ (cm 2 ), is less than the previously reported fast neutron fluence of the same capsule, 2.19E+19 n/cm 2 (WCAP-15224, Table 7-1).

Request: The NRC staff requests technical justification for why the fluence values of the withdrawn capsules reported for capsule schedule changes are different from those described in the previous capsule analysis reports.

ML13154A368 *Transmitted b memo dated Ma 16 2013

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OFFICE L2-21LA EVIB/BC LPL2-2/BC LPL2-2/PM

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NAME layton SRosenberg* SLingam DATE 06/04/13 04/13 05/16/13 06/04/13