ML20024A281

Summary of 830428 Meeting W/Util,Dames & Moore,Ertec,Usgs, Gilbert Assoc & Urs/Blume in Bethesda,Md Re Seismic Confirmatory Program

ML20024A281
Person / Time
Site:	Summer
Issue date:	06/10/1983
From:	Hopkins J Office of Nuclear Reactor Regulation
To:	Office of Nuclear Reactor Regulation
References
NUDOCS 8306160299
Download: ML20024A281 (5)

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June 10, 1983 Docket No. 50-395

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APPLICANT: South Carolina Electric & Gas Company l

FACILITY:

Virgil C. Summer Nuclear Station, Unit 1 l

SUMMARY

OF MEETING WITH SOUTH CAROLINA ELECTRIC

& GAS COMPANY - VIRGIL C. SUMMER NUCLEAR STATION,

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UNIT 1 GENERAL A meeting was held on April 28, 1983, in Bethesda, Maryland for a discussion of the licensee's seismic confirmatory program. A list of meeting attendees is enclosed.

DISCUSSION The staff discussed its review to date of the licensee's seismic confirmatory pro-gram. From this, the staff has the following two comments:

1.

The licensee should document the actual distribution of spectral ratios and justify empirically the use of log-normal statistics.

Based on the actual distribution, the licensee should calculate foundation / free-field spectral ratios for percent 11es ranging from, at least, the 50th through the 90th, in IO-percentile steps, for the total site-to-site and shot-to-shot variability. Reduced envelope spectra corresponding to these percentiles should be cal-culated, using the results from the pad-shaking tests.

2.

Regarding the sensitivity of the results to assumptions about phase response, the licensee should calculate upper-bound reduced response spectra for computed foundation motions that have been processed with a spiking filter (e.g. Robinson,1978); the pro-cessed signals will have the same amplitude spectra but will be compressed in time as much as possible. Alternatively, the licensee should demonstrate some other upper bound, given that the pad-to-foundation transfer function may not represent a physically realizable filter.

Reference Robinson, E. A., Multichannel Time Series Analysis with Digital Computor Programs, Revised Edition, Holden Day, San Fransisco,1978.

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SUMMER Mr. O. W. Dixon, Jr.

Vice President, Nuclear Operations South Carolina Electric & Gas Company P.O. Box 764 (Mail Code F-04)

Columbia, South Carolina 29218 cc: Mr. Henry Cyrus Senior Vice President South Carolina Public Service Authority 223 North Live Oak Drive Moncks Corner, South Carolina 29461 J. B. Knotts, Jr., Esq.

Debevoise & Liberman 1200 17th Street, N.W.

Washington, D. C.

20036 Mr. Mark B. Whitaker, Jr.

Group Manager - Nuclear Engineering

& Licensing South Carolina Electric & Gas Company P.O. Box 764 Columbia, South Carolina 29218 Mr. Brett Allen Bursey Route 1, Box 93C Little Mountain, South Carolina 29076 Resident Inspector / Summer NPS c/o U. S. Nuclear Regulatory Commission Route 1, Box 64 Jenkinsville, South Carolina 29065 James P. O'Reilly, Regional Administrator U.S. Nuclear Regulatory Commission, Region II 101 Marietta Street Atlanta, Georgia 30303 Mr. R. W. Knapp Combustion Engineering, Inc.

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%js List of Attendees April 28,1983 NRC SCE&G J. Hopkins N. Clark R. Rot ban R. Whorton J. King S. Alexander - Consultant L. Reiter J. Kimball Dames & Moore URS/Blume R. McGuire M. Somerville ErTec, Inc.

C. Crouse Gilbert Associates, Inc.

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. e June 10, 1983 MEETING

SUMMARY

DISTRIBUTION x Docket: No(s):l ~50-3953 NRC/PDR Local PDR NSIC PRC System LB #4 r/f Attorney, OELD E. Adensam Project Manager J. Hopkins Licensing Assistant M. Duncan NRC

Participants:

J. Hopkins R. Rothman J. King L. Reiter J. Kimball v

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