ML20137W065

Approves Request to Use ASME Code Case N-397 on Spectral Shifting as Alternative to Guidance in Reg Guide 1.122. Listed Commitments Must Be Submitted Before Approval to Use ASME Code Case N-411 as Alternative to Reg Guide 1.61

ML20137W065
Person / Time
Site:	Sequoyah
Issue date:	12/02/1985
From:	Harold Denton Office of Nuclear Reactor Regulation
To:	Parris H TENNESSEE VALLEY AUTHORITY
References
RTR-REGGD-01.061, RTR-REGGD-01.122, RTR-REGGD-1.061, RTR-REGGD-1.122 NUDOCS 8512100163
Download: ML20137W065 (2)

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December 2,1985 Dccket Nos: 50-327 and 50-328 Mr. H. G. Parris Manager of Power & Engineering, Nuclear Tennessee Valley Authority 6N011B Missionary Ridge Place 1101 Market Street Chattanooga, Tennessee 37402-2801

Subject:

Use of ASME Code Cases N-397 and N-411 for the Sequoyah Nuclear Plant Units 1 and 2 The staff completed its review of the Tennessee Valley Authority (TVA) request for authorization to use ASME Code Case N-397 on spectral shifting and ASME Code Case N-411 for damping as alternatives to the guidance in Regulatory Guides 1.122 and 1.61, respectively, as discussed in the applicant's letters dated August 5 and 13, 1985.

Code Case N-397, " Alternate Rules to the Spectral Broadening Procedures of N-1226.3 for Classes 1, 2, and 3 Piping Section III, Division 1" is an accept-able Code Case and is approved by the st?ff for specific plant applications pending revision of Regulatory Guide 1.122. The Code Case is approved as written with no additional requirements other than those specified in the Code Case.

Code Case N-411. " Alternative Damping Values for Seismic Analysis of Piping Section III Division 1 Class 1, 2, and 3 Construction" is a conditionally acceptable Code Case and is approved by the staff for specific plant applications pending revision of Regulatory Guide 1.61.

In addition to the information pro-vided in the' August 5 and 13, 1985, letters, TVA must submit the following commitments before the staff can approve this request:

(a) Coarnit to use the case for piping systems analyzed by response spectrum methods and not those using time-history analysis methods.

(b) 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.

Sincerely, h

p aro d. Denton, [1 rector p

Office of Nuclear Reactor Regulation cc: See next page i

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Mr. H. G. Parris i

Tennessee Valley Authority Sequoyah Nuclear Plant cc:

Herbert S. Sanger, Jr., Esq.

Tennessee Department of Public General Counsel Health Tennessee Valley Authority ATTN:

Director, Bureau of 400 West Summit Hill Drive, E 118 3' Environmental Health Services Knoxville, Tennessee 37902 Cordell Hull Building Nashville, Tennessee 37219 Mr. K. W. Whitt Mr. Michael H. Mobley, Director Tennessee Valley Authority Division of Radiological Health 400 West Sumit Hill Drive, E3A8 T.E.R.R.A. Building Knoxville, Tennessee 37902 150 9th Avenue North Nashville, Tennessee 37203 Mr. Bob Faas Westinghouse Electric Corp.

County Judge P.O. Box 355 Hamilton County Courthouse Pittsburgh, Pennsylvania 15230 Chattanooga, Tennessee 37402 Mr. Jerry Wills Tennessee Valley Authority SN 133 Lookout Place Chattanooga, Tennessee 37402-2801 Mr. Donald L. Williams, Jr.

Tennessee Valley Authority 400 West Sumit Hill Drive, W10885 Knoxville, Tennessee 37902 Resident Inspector /Sequoyah NPS c/o U.S. Nuclear Regulatory Commission 2600 Igou Ferry Road Soddy Daisy, Tennessee 37379 Regional Admi.nistrator, Region II U.S. Nuclear Regulatory Commission, 101 Marietta Street, N.W., Suite 2900 Atlanta, Georgia 30323 Mr. Everett Whitaker Tennessee Valley Authority SN 1288 Lookout Place Chattanooga, Tennessee 37402-2801 i'

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