ML20006E913

Documents 0.005 as Time Interval of Integration Used in Analyses of Seismic Class I Structures.No Specific Definition of Seismic Analysis Time Interval of Integration for Other Seismic Class I Structures Provided in Plant FSAR

ML20006E913
Person / Time
Site:	Browns Ferry
Issue date:	02/16/1990
From:	Michael Ray TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
NUDOCS 9002260536
Download: ML20006E913 (3)

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. TENNESSEE VALLEY AUTHORITY CH ATTANOOGA. TENNESSEE 37401 SN 157B Lookout Place FEB 161990 U.S. Nuclear Regulatory Commission c: ATIN: Document Control Desk L Hashington, D.C. 20555 Gentlemen:

In the Matter of ) Docket Nos. 50-259 Tennessee Valley Authority ) 50-260 50-296

i. BROWNS EERRY NUCLEAR PLANT (BfN) - UNITS 1, 2, 3 - TIME INTERVAL OF INTEGRATION FOR SEISMIC ANALYSIS This' letter serves to document that the time interval of integration used in

, the-analyses of BfN Selsmic Class I structures is 0.005 seconds.

Currently the Browns Ferry Final Safety Analysis Report (FSAR), Section 12.2.2.8.1, Dynamic Earthquake Analysis - Reactor Building Structure, notes l'

that the integration Interval used in the response calculations for the Reactor Building is 0.005 seconds. .No specific definition of the seismic analysis time interval of integration for other Seismic Class I structures is provided.

As part of the FSAR verification and update, in accordance'wlth 10 CFR 50.71, scheduled to be submitted by July 22, 1990, this statement in 12.2.2.8.1 will be revised to clarify this issue. The time interval of integration of 0.005 seconds is used in the seismic analysis of the Reactor Building structure and in the seismic analyses of the other Seismic Class I structures.

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Very truly yours, TENNESSEE VALLEY AUTHORITY-f%

Mana (r, Nuclear Licensing and Regulatory Affairs n Enclosure cc: See page 2 h lj

g a n Sie i n !@ a' W <

P An Equal Opportunity Employer ()

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U.S. Nuclear Regulatory Commission l7g{g g g gg I

cc (Enclosure):

Ms. S. C. Black, Assistant Director for' Projects TVA Projects Division U.S. Nuclear Regulatory Comraission One White Flint, North 11555 Rockville Pike Rockville, Maryland 20852 Mr. B. A. Wilson, Assistant Director for Inspection Programs TVA Projects Division U.S. Nucicar Regulatory Commission Region II 101 Marietta Street, NW, Suite 2900 Atlanta, Georgia 30323 NRC Resident Inspector Browns Ferry Nuclear Plant Route 12. Box 637 Athens, Alabama 35609-2000 .

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ENCLOSURE List of Commitments Time Interval of-Integrption for Seismic Analysis As part of the FSAR verification and update, in accordance with 10 CFR 50.71, scheduled to be submitted by July 22, 1990, Section 12.2.2.8.1 will be revised to indicate the following. The time interval of integration of 0.005 seconds is used in the seismic analysis of the Reactor Building structures and in the seismic analyses of the other seismic Class I structures, s

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