ML20236X279

Forwards Proprietary & non-proprietary Rev 4,addendum 1 to TRs WCAP-13088 & WCAP-13089, W Series 44 & 51 Sgs,Generic Sleeving Rept,Laser Welded Sleeves, Revising Design Basis Info for 0.015 Inch Weld Width.Proprietary Info Withheld

ML20236X279
Person / Time
Site:	Farley
Issue date:	07/31/1998
From:	Dennis Morey SOUTHERN NUCLEAR OPERATING CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
Shared Package
ML111960205	List: ML20236X279 ML20236X286
References
NUDOCS 9808070260
Download: ML20236X279 (6)

Text

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• 0:ve Morey

, 1 Siuthern Nuclear Vice President Operating CompaIy Farley Project P.0 Box 1295 Birrningham Alabama 35201 Tel 205.992.5131 July 31, 1998 SOUTHERN COMPANY Energy to Serve hurWorld*

Docket Nos.: 50-348' 50-364 U. S. Nuclear Regulatory Commission :

A1TN: Document Control Desk Washington, DC 20555 Joseph M. Farley Nuclear Plant Laser Welded Sleeve Weld Width Ladies and Gentlemen:

Recently Southern Nuclear Operating Company was informed by Westinghouse Electric Company that the analysis to evaluate the effect of rtvised operating conditions on steam generator tube laser welded

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l sleeve integrity lead to the detennination that the finite element model used to initially qualify the 0.015 inch weld width under-predicted the shear stress on the welds. The design of the laser welded sleeve is predicated on the design rules of Section III of the ASME Code.Section III of the ASME Code provides two alternative approaches to qualify a component: analysis or experiment. Utilizing conventional analysis techniques, it was detennined that the shear stress for the 0.015 inch minimum weld width exceeded the ASME C6de allowable. Consequently, a verification program using experimental analysis has been performed by Westinghouse Electric Company to show that the 0.015 inch weld remains in compliance with Section III of the ASME Code.

The acceptability of the 0.015 inch laser weld was evaluated using pressure tests to establish the pressure retaining capability of the welds (primary stress), and a revised finite element analysis to evaluate fatigue usage in the welds. Overall, the verification effort shows that minimum weld width of 0.015 inch for the tube / sleeve weld is acceptable and meets the requirements of the ASME Code.

The enclosed addendum to WCAP-13088, " Westinghouse Series 44 and 51 Steam Generators Generic Sleeving Report, Laser Welded Sleeves," provides the revised design basis information for the 0.015 inch weld width. This report applies only to the qualification of the 0.015 inch laser weld width. 'Be qualification of the sleeve and tube documented in earlier revisions of the generic topical and Farley specific WCAP report still applies. All other aspects of the existing licensing documentation for laser 'f welded sleeves are unaffected by the recent weld width verification effort and remain in effect including installation, weld qualification, and inspection techniques. SNC believes that no Technical Specification change is needed to address this issue and is submitting this addendum for staff review ]

and information.

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Enclosure I contains WCAP-13088, " Westinghouse Series 44 and 51 Steam Generators Generic i Sleeving Report, Laser Welded Sleeves", Revision 4, Addendum 1, Proprietary Class 2C, j 9908070260 900731 C LTF GN N 0%

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U. S. Nuclear Regulatory Commission Page 2 l

l l June 1998. Also enclosed is a Proprietary Information Notice, and Copyright Notice. Enclosure 2

l. contains Westinghouse authorization letter, CAW-98-1256, and accompanying affidasit.

Enclosure 3 contains WCAP-13089, " Westinghouse Series 44 and 51 Steam Generators Generic Sleeving Report, Laser Welded Sleeves", Revision 4, Addendum 1, Non-proprietary Class 3, June 1998 As Enclosure I contains information proprietary to Westinghouse Electric Company, it is supported by an affidavit signed by Westinghouse, the owner of the information. The affidasit sets fonh the basis on which the information may be withheld from public disclosure by the Commission and addresses with

! specificity the considerations listed in paragraph (b)(4) of Section 2.790 of the Commission's l regulations. Accordingly, it is respectfully requested that the information which is proprietary to i- - Westinghouse be withheld from public disclosure in accordance with 10 CFR Section 2.790 of the i Commission's regulations. Correspondence with respect to the copyright or proprietary aspects of the items listed above or the supporting Westinghouse Affidavit should reference CAW-98-1256 and should be addressed to H. A. Sepp, Manager, Regulatory and Licensing Engineering, Westinghouse Electric

. Company, Energy Center Site,4350 Northern Pike, Monroeville, Pennsylvania, 15146-2886.

If there are any questions, please advise.

Respectfully submitted, l SOUTHERN NUCLEAR OPERATING COMPANY N 7r Dave Morey REM:mafsggsr. doc

Enclosures:

1. - WCAP-13088, Westinghouse Series 44 and 51 Steam Generators Generic Sleeving Repoit, L Laser Welded Sleeves, June 1998, Revision 4, Addendum I, Proprietary Class 2C;

. Proprietary Information Notice; and Copyright Notice.

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2. Westinghouse Letter " Application for Withholding Proprietary Information from Public

Disclosure (CAW-98-1256 with Affidavit CAW-98-1256).

3. WCAP-13089, Westinghouse Series 44 and 51 Steam Generators Generic Sleeving Report, i Laser Welded Sleeves, June 1998, Revision 4, Addendum 1, Non-Proprietary Class 3. ' 1 l

l cc: . Mr. L. A. Reyes, Region II Administrator lI Mr. J. I.~Zimmerman, NRR Project Manager j Mr. T. M. Ross, Plant Sr. Resident Inspector i i . . .

s ENCLOSURE 1 WCAP-13088, Westinghouse Series 44 and 51 Steam Generators Generic Sleeving Report, Laser Welded Sleeves, June 1998, Revision 4, Addendum 1, Proprietary Class 2C Proprietary Information Notice Copyright Notice

i Proprietary Information Notice Transmitted herewith are proprietary and/or non-proprietary versions of documents furnished to the L

NRC in connection with ruquests for generic and/or plant-specific review and approval.

In onier to ca fonn to the requirements of 10 CFR 2.790 of the Commission's regulations concernha i the protection of proprietary information so submitted to the NRC, the information which is proprietary l in the proprietary versions is contamed within brackets, and where the proprietary information has been

! deleted in the non-proprietary versions, only the brackets remain (the information that was contained

! within the brackets in the proprietary versions having been deleted). Thejustification for claiming the

. info..r.i.Lon so designated as proprietary is indicated in both versions by means oflower case letters (a) l through (f) contained within parentheses located (4 a superscript

-& LHy followmg the brackets '{

enclosing each item ofinformation being identified as proprietary or in the margin opposite such information. These lower case letters refer to the types ofinformation Weciaghase customarily holds

)

s l in c-Ah identified in Sectiors (4)(ii)(a) through (4)(ii)(f) of the affidavit accompanying thic I transmittal pursuant to 10 CFR 2.790(b)(1).

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Copyright Notice The reports transmitted herewith each bear a Westinghouse copyright notice. The NRC is permitted to l make the number of copies of the information contained in these reports which are necessary for its l internal use in connection with generic and p!&d-3p,inc reviews and approvals as well as the issuance, denial, amendment, transfer, rene r;.d, modification, suspension, revocation, or violation of a license, permit, order, or regulation subject to the requirements of 10 CFR 2.790 regarding restri:tions on public disclosure to the extent such information has been identified as proprietary by Westinghouse, copyright protection notwithstanding. With respect to the non-proprietary versions of these reports, the NRC is permitted to nuke the number of copies beyond those necessary for its internal use which are necessary in order to have one copy available for public viewing in the appropriate docket files in the public document room in Washington, DC and in local public document rooms as may be required by NRC regulations if the number of copics submitted is insufficient for this purpose. Copies nude by the NRC must include the copyright notice in all instances and the proprietary notice if the original was identified as proprietary.

ENCLOSURE 2 l-Westinghouse Letter " Application for Withholding Proprietary Information from Public Disclosure (CAW-98-1256 with Affidavit CAW-98-1256) l' l

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