ML062120411

Technical Specifications Changes TS-431 and TS-418 - Extended Power Uprate - Revised Steam Dryer Stress Report

ML062120411
Person / Time
Site:	Browns Ferry
Issue date:	07/21/2006
From:	Crouch W Tennessee Valley Authority
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
TAC MC3743, TAC MC3744, TAC MC3812, TVA-BFN-TS-418, TVA-BFN-TS-431
Download: ML062120411 (5)

Text

Tennessee Valley Authority, Post Office Box 2000, Decatur, Alabama 35609-2000 July 21, 2006 TVA-BFN-TS-431 TVA-BFN-TS-418 10 CFR 50.90 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Mail Stop OWFN, P1-35 Washington, D. C. 20555-0001 Gentlemen:

In the Matter of ) Docket Nos. 50-259 Tennessee Valley Authority ) 50-260 50-296 BROWNS FERRY NUCLEAR PLANT (BFN) -UNITS 1, 2, AND 3 -TECHNICAL SPECIFICATIONS (TS) CHANGES TS-431 AND TS-418 -EXTENDED POWER UPRATE (EPU) -REVISED STEAM DRYER STRESS REPORT (TAC NOS. MC3812, MC3743, AND MC3744)By letters dated June 28, 2004 (ADAMS Accession No.ML041840109) and June 25, 2004 (ML041840301), TVA submitted applications to the NRC for EPU of BFN Unit 1 and BFN Units 2 and 3, respectively.

In support of the applications for EPU, TVA is providing certain engineering reports to demonstrate that the structural integrity cf the BFN steam dryers will not be challenged under EPU conditions.

These reports include steam dryer benchmarking, scale model testing, and stress analysis reports for the B-FN steam dryers under EPU operating conditions.

By letters dated March 9, 2006 (ML060720303), April 13, 2006 (ML061070627), May 5, 2006 (ML061300436), and June 23, 2006, TVA provided the GE scale model steam dryer benchmarking report, the BFN scale model test report, the CDI load definition benchmarking report, the BFN steam dryer (unmodified) stress report, and the BFN steam dryer (modified) stress report, respectively.

U.S. Nuclear Regulatory Commission Page 2 July 21, 2006 This letter transmits a revised BFN steam dryer stress analysis report, representing planned steam dryer modifications.

Enclosure 1 is the revised BFN steam dryer stress analysis report, entitled "Browns Ferry Nuclear Plant, Units 1, 2, and 3 Steam Dryer Stress, Dynamic, and Fatigue Analyses for EPU Conditions," prepared by General Electric Company (GE). This report provides a summary structural analysis of the modified steam dryer at EPU conditions and supersedes in its entirety the stress analysis report provided NRC by TVA letter dated June 23, 2006.The planned steam dryer modifications described in the revised stress report are based on the evaluated loads. The modified steam dryer configuration includes a replacement outer hood and cover plates of one-inch thickness, together with reinforcements to certain welds. In addition, the outer hood stiffeners, cover plate access hole, and manway cover will be eliminated.

Enclosure 3 is a revision to the BFN load definition report that was previously provided as Enclosure 1 to TVA's letter of May 5, 2006. The BFN load definition was derived from scale model testing of the BFN Unit 1 steam dryer and the application of an acoustic circuit methodology that was validated based on the Quad Cities Unit 2 instrumented steam dryer. As described in the revised load definition report, actual pressure measurements were taken from the main steam lines in the scale model test and input to the acoustic circuit model to develop the load definition.

This report contains revised uncertainty determination for the acoustic circuit methodology.

Enclosure 3 supersedes the version provided on May 5, 2006, in its entirety.The engineering analyses for the modified dryer demonstrate that the stresses on the steam dryer components will be within the fatigue endurance limits under EPU conditions, even considering the conservatism in the scale model test-based load definition.

In addition, the conservatisms incorporated in the power ascension limit curves provide further assurance that operational stresses in the modified BFN steam dryers will remain well within the acceptance criteria during EPU operation.

Therefore, the modified BFN steam dryers are acceptable for EPU operation.

U.S. Nuclear Regulatory Commission Page 3 July 21, 2006 Please note that the engineering reports provided in Enclosures 1 and 3 contain information that GE considers to be proprietary in nature and subsequently, pursuant to 10 CFR 9.17(a) (4), 2.390(a) (4) and 2.390(d) (1), requests that such information be withheld from public disclosure.

Enclosures 2 and 4 are redacted versions of the reports in Enclosures 1 and 3, respectively, with the GE proprietary material removed. Enclosures 2 and 4 are suitable for public disclosure.

Enclosures 1 and 3 contain affidavits from GE supporting this request for withholding from public disclosure.

TVA has determined that the additional information provided by this letter does not affect the no significant hazards considerations associated with the proposed TS changes.The proposed TS changes still qualify for a categorical exclusion from environmental review pursuant to the provisions of 10 CFR 51.22(c) (9).There are no new regulatory commitments contained in this letter. If you have any questions regarding this letter, please contact me at (256)729-2636.

I declare under penalty of perjury that the foregoing is true and correct. Executed on this 21't day of July, 2006.Sincerely, William D. Crouch Manager of Licensing and Industry Affairs

Enclosures:

1: GE-NE-0000-0053-7413-RI-P (proprietary version)2: GE-NE-0000-0053-7413-RI-NP (non-proprietary version)3: CDI Report No.06-11P, Revision 2 (proprietary version)4: CDI Report No. 06-11, Revision 2 (non-proprietary version)

U.S. Nuclear Regulatory Commission Page 4 July 21, 2006 Enclosures cc: (Enclosures):

State Health Officer Alabama Dept. of Public Health RSA Tower -Administration Suite 1552 P.O. Box 303017 Montgomery, AL 36130-3017 U.S. Nuclear Regulatory Commission Region II Sam Nunn Atlanta Federal Center 61 Forsyth Street, SW, Suite 23T85 Atlanta, Georgia 30303-3415 Mr. Malcolm T. Widmann, Branch Chief U.S. Nuclear Regulatory Commission Region II Sam Nunn Atlanta Federal Center 61 Forsyth Street, SW, Suite 23T85 Atlanta, Georgia 30303-8931 NRC Senior Resident Inspector Browns Ferry Nuclear Plant 10833 Shaw Road Athens, Alabama 35611-6970 NRC Unit 1 Restart Senior Resident Inspector Browns Ferry Nuclear Plant 10833 Shaw Road Athens, Alabama 35611-6970 Margaret Chernoff, Project Manager U.S. Nuclear Regulatory Commission (MS 08G9)One White Flint, North 11555 Rockville Pike Rockville, Maryland 20852-2739 Ms. Eva A. Brown, Project Manager U.S. Nuclear Regulatory Commission (MS 08G9)One White Flint, North 11555 Rockville Pike Rockville, Maryland 20852-2739 ENCLOSURE 2 TENNESSEE VALLEY AUTHORITY BROWNS FERRY NUCLEAR PLANT (BFN)UNITS 1, 2, AND 3 TECHNICAL SPECIFICATIONS (TS) CHANGES TS-431 AND TS-418 -EXTENDED POWER UPRATE (EPU) -REVISED STEAM DRYER STRESS REPORT (TAC NOS. MC3812, MC3743, AND MC3744)GE ENGINEERING REPORT NO. GE-NE-0000-0053-7413-RI-NP (NON-PROPRIETARY VERSION)Attached is the Non-Proprietary Version of GE Engineering Report No.GE-NE-0000-0053-7413-RI-NP, "Browns Ferry Nuclear Plant, Units 1, 2, and 3 Steam Dryer Stress, Dynamic, and Fatigue Analyses for EPU Conditions."