ML20003J280

Advises That Util 810325 Request to Change Compaction Requirements in Designated Area North of Turbine Bldg Is Acceptable

ML20003J280
Person / Time
Site:	Vogtle
Issue date:	05/01/1981
From:	Tedesco R Office of Nuclear Reactor Regulation
To:	Ehrensperger W GEORGIA POWER CO.
References
NUDOCS 8105110152
Download: ML20003J280 (3)

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DEisenhut TERA BJYoungblood NRC/POR MAY 1198)

SBurwell L/PDR MRushbrook NSIC Docket Nos.: M RTedesco TIC and 50-425 RVollmer ACRS (16)

TMurley RMattson Mr. W. E. Ehrensperger PHartfield, MDA Senior Vice President Acting AD/M&OE Power Supply OELD Georgia Power Company OIE (3)

P. O. Box 4525 Glear Atlanta, Georgia 30302 OThomoson

Subject:

Request for Change in Backff11 Compaction Criteria The Georgf a Power Company (GPC) requested NRR review and approval of a change in backfill criteria for the Vogtle Plant, as described in a letter from G. Head, GPC, to D. Eisenhut, NRR, dated March 25, 1981 The PSAR states that all select sand backfill adjacent to and beneath Category I structures is to be compacted to 97% of the aximum denstty determined by ASTM method D-1557 The backffll material is required, by specifications, to be sand and silty sand containing less than 25% fines.

The above letter reported that the backffll material used so far has had fines contents in the lov end of the allowable range and that this material has been compacted to the specified 97%. Because of shortage of this most suitable l

material, GPC wishes to now use backfill material with fines contents in the higher end of the allowable range; however, the spectfied 97% compaction is difficult to obtain with this material without a greater incidence of reworking.

Thus GPC wishes to reduce the compaction requirement to 95% for backfill sof1 having the relatively higher fines content, and to use this material only north of the turbine building and above foundation level.

We have reviewed the above letter and we concur in the position that the proposed change in the compaction requirements in the designated area north of the turbine building will not affect the sef smic Category I structures and therefore find the described change in compaction requirement to be acceptable.

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W Mr. W. E. Ehrensperger This review has been made by Dr. Owen 0. Thompson, Geotechnical Engineer, Hydro-logic and Geotechnical Engineering Branch, Division of Engineering, Office of Nuclear Reactor Regulation.

Sincerely, Ulf W

obert L. Tedesco, Assistant Director for Licensing Division of Licensing cc: See next page f

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Mr. W. E. Ehrensperger Senior Vice President Power Supply Georgia Power Company P. O. Box 4545.

Atlanta, Georgia 30302 cc: Mr. L. T. Gucwa Chief Nuclear Engineer Georgia Power Company P. O. Box 4545 Atlanta, Georgia 30302 Mr. Ruble A. Thomas Vice President Southern Services, Inc.

P. O. Box 2625 Birmingham, Alabama 35202 Mr. J. A. Baily Project Licensing Manager Southern Company Services, Inc.

P. O. Box 2625 Birmingham, Alabama 35202 George F. Trowbridge, Esq.

Shaw, Pittman, Potts and Trowbridge 1800 M Street, N. W.

Washington, D. C.

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