ML051730507

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Requests for Additional Information for the Review of the Browns Ferry Nuclear Plant, Units 1, 2 and 3, License Renewal Application
ML051730507
Person / Time
Site: Browns Ferry  Tennessee Valley Authority icon.png
Issue date: 06/22/2005
From: Subbaratnam R
NRC/NRR/DRIP/RLEP
To: Singer K
Tennessee Valley Authority
Subbaratnam R, NRR/DRIP/RLEP, 415-14
References
TAC MC1704, TAC MC1705, TAC MC1706
Download: ML051730507 (7)


Text

June 22, 2005 Mr. Karl W. Singer Chief Nuclear Officer and Executive Vice President Tennessee Valley Authority 6A Lookout Place 1101 Market Street Chattanooga, TN 37402-2801

SUBJECT:

REQUESTS FOR ADDITIONAL INFORMATION (RAIs) FOR THE REVIEW OF THE BROWNS FERRY NUCLEAR PLANT, UNITS 1, 2, AND 3, LICENSE RENEWAL APPLICATION (TAC NOS. MC1704, MC1705 AND MC1706)

Dear Mr. Singer:

By letter dated December 31, 2003, Tennessee Valley Authority, (TVA or the applicant) submitted an application pursuant to 10 CFR Part 54, to renew the operating licenses for Browns Ferry Nuclear (BFN) Plant, Units 1, 2, and 3, for review by the U.S. Nuclear Regulatory Commission (NRC). The NRC staff is reviewing the information contained in the license renewal application (LRA) and has identified, in the enclosure, areas where additional information is needed to complete the review.

These RAIs were discussed with your staff, Ken Brune, and a mutually agreeable date for this response is within 30 days from the date of this letter. If you have any questions, please contact me at 301-415-1478 or e-mail RXS2@nrc.gov.

Sincerely,

/RA/

Ram Subbaratnam, Project Manager License Renewal Section A License Renewal and Environmental Impacts Program Division of Regulatory Improvement Programs Office of Nuclear Reactor Regulation Docket Nos.: 50-259, 50-260, and 50-296

Enclosure:

As stated cc w/encl: See next page

June 22, 2005 Mr. Karl W. Singer Chief Nuclear Officer and Executive Vice President Tennessee Valley Authority 6A Lookout Place 1101 Market Street Chattanooga, TN 37402-2801

SUBJECT:

REQUESTS FOR ADDITIONAL INFORMATION (RAIs) FOR THE REVIEW OF THE BROWNS FERRY NUCLEAR PLANT, UNITS 1, 2, AND 3, LICENSE RENEWAL APPLICATION (TAC NOS. MC1704, MC1705 AND MC1706)

Dear Mr. Singer:

By letter dated December 31, 2003, Tennessee Valley Authority, (TVA or the applicant) submitted an application pursuant to 10 CFR Part 54, to renew the operating licenses for Browns Ferry Nuclear (BFN) Plant, Units 1, 2, and 3, for review by the U.S. Nuclear Regulatory Commission (NRC). The NRC staff is reviewing the information contained in the license renewal application (LRA) and has identified, in the enclosure, areas where additional information is needed to complete the review.

These RAIs were discussed with your staff, Ken Brune, and a mutually agreeable date for this response is within 30 days from the date of this letter. If you have any questions, please contact me at 301-415-1478 or e-mail RXS2@nrc.gov.

Sincerely,

/RA/

Ram Subbaratnam, Project Manager License Renewal Section A License Renewal and Environmental Impacts Program Division of Regulatory Improvement Programs Office of Nuclear Reactor Regulation Docket Nos.: 50-259, 50-260, and 50-296

Enclosure:

As stated cc w/encl: See next page DISTRIBUTION: See next page Adams Accession No.: ML051730507 Document Name: E:\\Filenet\\ML051730507.wpd OFFICE PM:RLEP PM:RLEP LA:RLEP SC:RLEP NAME YDiaz-Sanabria (R. Subbaratnam for)

RSubbaratnam MJenkins SLee (R. Auluck for)

DATE 06 / 21 /05 06 / 21 /05 06 / 17 /05 06 / 22/05 OFFICIAL RECORD COPY

BROWNS FERRY NUCLEAR PLANT Tennessee Valley Authority cc:

Mr. Karl W. Singer Chief Nuclear Officer and Executive Vice President Tennessee Valley Authority 6A Lookout Place 1101 Market Street Chattanooga, TN 37402-2801 Mr. Ashok S. Bhatnagar, Senior Vice President, Nuclear Operations Tennessee Valley Authority 6A Lookout Place 1101 Market Street Chattanooga, TN 37402-2801 Mr. Michael J. Lorek, General Manager Nuclear Engineering Tennessee Valley Authority 6A Lookout Place 1101 Market Street Chattanooga, TN 37402-2801 Mr. Michael D. Skaggs, Site Vice President Browns Ferry Nuclear Plant Tennessee Valley Authority P.O. Box 2000 Decatur, AL 35609 General Counsel Tennessee Valley Authority ET 11A 400 West Summit Hill Drive Knoxville, TN 37902 Mr. John C. Fornicola, Manager Nuclear Assurance and Licensing Tennessee Valley Authority 6A Lookout Place 1101 Market Street Chattanooga, TN 37402-2801 Mr. Kurt L. Krueger, Plant Manager Browns Ferry Nuclear Plant Tennessee Valley Authority P.O. Box 2000 Decatur, AL 35609 Mr. Jon R. Rupert, Vice President Browns Ferry Unit 1 Restart Browns Ferry Nuclear Plant Tennessee Valley Authority P.O. Box 2000 Decatur, AL 35609 Mr. Robert G. Jones Browns Ferry Unit 1 Plant Restart Manager Browns Ferry Nuclear Plant Tennessee Valley Authority P.O. Box 2000 Decatur, AL 35609 Mr. Fredrick C. Mashburn, Senior Program Manager, Nuclear Licensing Tennessee Valley Authority 4X Blue Ridge 1101 Market Street Chattanooga, TN 37402-2801 Mr. Timothy E. Abney, Manager Licensing and Industry Affairs Browns Ferry Nuclear Plant Tennessee Valley Authority P.O. Box 2000 Decatur, AL 35609 Mr. Bobby L. Holbrook Senior Resident Inspector U.S. Nuclear Regulatory Commission Browns Ferry Nuclear Plant 10833 Shaw Road Athens, AL 35611-6970

BROWNS FERRY NUCLEAR PLANT Tennessee Valley Authority cc:

State Health Officer Alabama Dept. of Public Health RSA Tower - Administration Suite 1552 P.O. Box 303017 Montgomery, AL 36130-3017 Chairman Limestone County Commission 310 West Washington Street Athens, AL 35611 Mr. James Ross Nuclear Energy Institute 1776 I St., NW, Suite 400 Washington, DC 20006-2708 Ken Brune, Manager Browns Ferry License Renewal Project Tennessee Valley Authority 6A Lookout Place 1101 Market Street Chattanooga, TN 37402-2801

DISTRIBUTION: Letter to K. Singer, Re: RAI for review of Browns Ferry Nuclear Plant, Units 1 and 2, Dated: June 22, 2005 Adams Accession No.: ML051730507 HARD COPY RLEP RF E-MAIL:

RidsNrrDrip RidsNrrDe G. Bagchi K. Manoly W. Bateman J. Calvo R. Jenkins P. Shemanski J. Fair RidsNrrDssa RidsNrrDipm D. Thatcher R. Pettis G. Galletti C. Li K. Winsberg (RidsOgcMailCenter)

R. Weisman M. Mayfield A. Murphy S. Smith (srs3)

S. Duraiswamy Y. L. (Renee) Li RLEP Staff K. Jabbour C. Julian (RII)

S. Cahill (RII)

A. Hodgdon C. Carpenter D. Coe E. Kleeh M. Marshall G. Cheruvenki B. Elliot M. Hartzman

Enclosure BROWNS FERRY NUCLEAR PLANT (BFN), UNITS 1, 2, AND 3 LICENSE RENEWAL APPLICATION (LRA)

REQUESTS FOR ADDITIONAL INFORMATION (RAIs)

FOLLOW UP QUESTIONS TO SECTION 4.7.7 TIME LIMITED AGING ANALYSIS RAIs Section 4.7.7 of the LRA evaluated loss of preload of the core plate hold-down bolts due to thermal and irradiation effects in accordance with the requirements of 10 CFR 54.21(c)(1)(ii).

For the 40-year lifetime, the Boiling Water Reactor Vessel and Internals Project-25 (BWRVIP-25),

concluded that all core plate hold-down bolts will maintain some preload throughout the life of the plant. For the period of extended operation, the expected loss of preload was assumed to be 20%, which bounds the original BWRVIP analysis. With a loss of 20% in preload, the core plate will maintain sufficient preload to prevent sliding under both normal and accident conditions.

Based on this assumption, the applicant concludes that the loss of preload is acceptable for the period of extended operation. The NRC staff previously sent RAIs 4.7.7-1 and 4.7.7-2 by letter dated March 3, 2005. The following are follow up questions.

RAI 4.7.7-3 (a) In response to RAI-4.7.7-2(b), the applicant referenced stress relaxation curves that were developed by General Electric Nuclear Energy (GENE). Provide the data that was used to develop the curves and explain how this data was utilized to establish the curves.

(b) The applicants response referenced a paper by J.P. Foster, Analysis of In-reactor Stress Relaxation Using Irradiation Creep Models, which provides data regarding the relationship between the irradiation creep stress/strain vs. displacements per atom (dpa) by using a McVetty equation. Did General Electric Company (GE) use this equation to calculate the maximum stress relaxation curve for the type 304 stainless steel bolts at the end-of-life fluence (54 EFPY) for the BFN Units?

RAI 4.7.7-4 To justify the GENE analysis, the applicant referenced Figure 7-13 of the BWRVIP-99 report, Crack Growth Rates in Irradiated Stainless Steels in BWR Internal Components, which shows data and modeling projections for stress relaxation versus fluence values measured in displacements per atom (dpa), for 20% cold worked type 316 stainless steel material. Provide an explanation as to why the type 316 stainless steel data is applicable to the type 304 stainless steel core plate hold-down bolts at the BFN units.

RAI 4.7.7-5 The paper by J.P. Foster uses a Half-Nelson model to calculate displacement damage (measured as dpa) due to radiation. Provide the dpa values for type 304 core plate hold-down bolts that correspond to end-of-life fluence (54 EFPY) using the "Half-Nelson" model or its equivalent for the BFN units.

RAI 4.7.7-6 Provide justification for the application of relaxation curves obtained in torsion to axial relaxation in bolts.

RAI 4.7.7-7 BWRVIP-25, Appendix B refers to a letter dated January 15, 1997, from V. L. McCarthy to B. A.

McAllister, GENE, Core Plate Bolt Relaxation Calculations for Extended Period of Operation.

The staff requests that the applicant provide these calculations so that it can evaluate the stress relaxation of the core plate hold-down bolts for the end-of-life fluence (54 EFPY) for the BFN units. The applicant may like to make appropriate proprietary determination as necessary to make original vendor evaluation available for staff review.