ML20137V086

Submits Commitments Supporting 850813 Request to Use ASME Code Case N-411,including Commitment to Use Code Case for Piping Sys Analyzed by Response Spectrum Methods. Use of Code Case N-411 Permitted Per 851202 Telcon

ML20137V086
Person / Time
Site:	Sequoyah
Issue date:	02/12/1986
From:	Gridley R TENNESSEE VALLEY AUTHORITY
To:	Youngblood B Office of Nuclear Reactor Regulation
References
NUDOCS 8602190422
Download: ML20137V086 (2)

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A TENNESSEE VALLEY AUTHORITY CHATTANOOGA TENNESSEE 37401 SN 157B Lookout Place February 12, 1986 Director of Nuclear Reactor Regulation Attention: Mr. B. Youngblood, Project Director PWR Project Directorate No. 4 Division of Pressurized Water Reactors (PWR)

Licensing A U.S. Nuclear Regulatory Commission Washington, D.C. 20555

Dear Mr. Youngblood:

In the Matter of ) Docket Nos. 50-327 Tennessee Valley Authority ) 50-328 By the August 5_and 13, 1985 letters from J. A. Domer to E. Adensam, we requested NRC approval to utilize ASME Code Cases N-397 and N-411. . The December 2, 1985 letter from H. R. Denton to H. G. Parris approved the use of Code Case N-397, and requested specific comitments before NRC could approve the use of Code Case N-411. Therefore, the following commitments are being provided in support of our request to use ASME Code Case N-411:

1. TVA will use the code case for piping systems analyzed by response spectrum methods and not those using time-history analysis methods.

2. When the alternate damping criteria-of this code case are used, they will be used in their entirety in a given analysis and shall not be a mixture of Regulatory Guide 1.61 criteria and the alternated criteria of this code case.

Based on a telephone discussion with Carl Stahle of your staff, we understand that the December 2, 1985 letter was to provide conditional approval of the use of Code Case N-411 upon submittal of the requested comitments. Also, since we did not take exception to the requested comitments, we were permitted to utilize Code Case N-411.

B602190422Og2 32'1 i

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PDR ADOCK O PDR 'O P

An Equal Opportunity Employer

FJ Director of Nuclear Reactor Regulation February 12, 9816 If you have any questions regarding this subject, please get in touch with Jerry Wills at FTS 858-2683.

Very truly yours, TENNESSEE LLEY AUTHORITY R. ri ley Manager of icensing Sworn o ap subscribed befpre me this - day of E/k. 1986 Notary Public

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My Comission Expires cc: U.S. Nuclear Regulatory Commission

. Region II Attn: Dr. J. Nelson Grace, Regional Administrator 101 Marietta Street, NW, Suite 2900 Atlanta, Georgia 30323 Mr. Carl Stahle Sequoyah Project Mans *,er U.S. Nuclear Regulato y. Commission 7920 Norfolk Avenue Bethesda, Maryland 20814