ML20128C294

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Draft Review:Geology
ML20128C294
Person / Time
Site: Vogtle, 05000426, 05000000, 05000427
Issue date: 02/08/1974
From: Morris R
INTERIOR, DEPT. OF, GEOLOGICAL SURVEY
To:
Shared Package
ML19292B772 List: ... further results
References
FOIA-84-624 NUDOCS 8505280245
Download: ML20128C294 (4)
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Draft Review Vogtle, Georgia R. H. Morris February 8, 1974 i

Georgia Power Company Vogtle Nuclear. Power Plant Burke County, Georgia AEC Docket Nos. 50-424 to -427 Geology The geologic information in the Preliminary Safety Analysis Report -(PSAR) and Amendments 1, 2, 3, 5, 7, 13, and 15 for the Vogtle' Nuclear Power Plant, Burke County, Georgia, has been reviewed and. compared with available literature in order to evaluate she adequacy of the scismic design criteria of the proposed facility.

Engineering geology and foundation conditions were not evaluated except in terms of regional geologic factors. A field examination-of the site was made April 24 and 25, 1973.

i-The Vogtle Nuclear Power Plant is to be located within the Atlantic Coastal Plain province about 25 miles southeast of Augusta, Ga., and on an upland surface about 100 feet above and adjacent to the Savannah River. At the plant site Coastal Plain sediments range

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in thickness'from 800 to 1,000' feet, consist predominantly of 1

sandstone, shale, limestone, claystone, and mari, and range in age l

from Upper Cretaceous to Holocene. Beneath the Coastal Plain strata are the various crystalline rocks typical of the Piedmont 25 miles i

to the west and an apparently downfaulted block of Triassic red beds.

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' Zones of relatively casily soluble limestone in strata near the surface and extending down to about 100 feet of depth have produced numerous-sinks throughout the site area. These strata will be a.

removed down to an underlying clay marl bed and replaced where needed with engineered fill. Plant facilities will be founded either directly on the clay. marl-bearing strata or on engineered fill, and thus any potential problem of collapse of solution cavities or sinks will be circumvented.

The applicant has demonstrated that the Coastal Plain strata beneath the site are not faulted (figs. 2.5-6,

-7,

-8,

-9, -10, a'nd

-11A) and that there does not appear to be any structural relation-

- ship _ of the minor flexure of the clay marl-bearing strata (fig. 2.5-10) with the. northeast-trending probable fault that bounds the inferred Triassic basin sedicents (Siple,1967; Marine and Siple,1970; 'and Petty and others,1965) some 800 feet beneath the site (fig. 2.5-4A, Amend. 15). Any faulting associated with these Triassic basins does not appear to have been tectonically active since pre-Upper Cretaceous time.

There are no other identifiable faults or other young geologic structures in the area that might be expected to localize seismicity in the immediate vicinity of the site.

However, because the structural features in the basement rocks underlying the Coastal Plain are so poorly known, epicenters of earthquakes that have occurred in the region commonly cannot be related directly to appropriate geologic features.

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s References Marine,,1. W., and Siple, G.

E., 1971, Buried Triassic basin in the central Savannah River arca, South Carolina and Georgia:

-Geol. Soc. America Abs. with Programs; v. 3, no. 5, p. 289-363.

Petty, A. J...Petrafeso. I.

A., and Moore, F.

C., Jr., 1970, Aeromagnetic map of the Savannah River Plant area, South Carolina and Georgia:

U.S. Geol. Survey Geophys. Inv. Map.

GP-489.

Siple, G. E.,1967, Geology and ground water of the Savannah River

. Plant and vicinity, South Carolina:

U.S. Geol. Survey Water-

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Supply Paper 1841, p'. 22.

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AEC DISTRIEUTION F07t PART 50 DOCKET MATERIAL (TDIPORARY, FORM),

CONTROL NO:

1565 FILE:

FROM:

DATE OF DOC DATE REC'D LTR MEMO.

RPT OTHER U. S. Dept of the Interior R3ston, Virginia Elmer H. Baltz 2-21-74 2-26-74 X

TO:

ORIG CC OTIER -

SENT AEC PDR William P. Gammill' i siened CLASS UNCLASS PROP INFO INPUT NO CYS REC'D DOCKET NO:

XXX 1

50-424/425/426/427 DESCRIPTION:

.i ENCLOSURES:

Ltrtransthefollowing...A Draft Review of the geologic aspects of the

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PLANT. NAME : V0GTLE 1,,2, 3 & 4 C 27 (1 ev enel ree'd)

FOR ACTION /I:70RMATION

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Reston, Virginia 22092 February 21, 197h

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I'.r. Villim P. Gann111 Chief, Site Safety 3 ranch i

Directorate of Licensinc; Office of Regulation U.S. Atomic Incrcy Co-nission Wnshin;; ton, D.C. 20545

Dear Mr. G m ill:

Enclosed for your information is a draft review of geolot;ic aspects of the Vo.p.le !!uclear Power P1nnt, Georgia, as presented in the Prelinin try Safety Analysis Report and onend:.ents (AEC Dochet Hos. 50 h24 to 50-h27).

The dre.ft was prepared by fir. R. H. Morris.

Our final report on this plant vill be trancnitted to you when the seisnologic review is concleted.

Sincerely yours, 2.nu

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-C-fJ Elrer H. Mitz Deputy Chief for En;;ineering Geolony Office of Environmental Geolocy Enclosure cc:

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Draft Review Vogtle, Georgia R. H. Morris February 8, 1974 Georgia Power Company Vogtle Nuclear Power Plant Burke County, Georgia

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AEC Docket Nos. 50-424 to -427 Geology.

The geologic information in the Preliminary Safety Analysis Report (PSAR) and Amendments 1, 2, 3, 5, 7, 13, and 15 for the Vogtle Nuclear Power Plant, Burke County, Georgia, has been reviewed and compared with available literature in order to evaluate the adequacy of the seismic design criteria of the proposed facilityl Engineering geology and foundation conditions were not evaluated except in terms of regional geologic factors.

A~ field examination of the site was made April 24 and 25, 1973.

The Vogtle Nuclear Power Plant is to be located within the

--im Atlantic Coastal Plain province about 25 miles southeast of Augusta, Ga., and on an upland surface about 100 feet above and adjacent to 7

the Savannah River. At the plant site Coastal Plain sediments range in thickness from 800 to 1,000 feet, consist predominantly of sandstone, shale, limestone, claystone, and earl, and range in age from Upper Cretaceous to-Holocene. Beneath the Coastal Plain strata are the various crystalline rocks typical of the Piedmont 25 miles to the west and an apparently downfaulted block of Triassic red beds.

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Zones of relatively easily soluble limestone in strata near the surface and extending down to about 100 feet of depth have produced numerous sinks throughout the site area. These strata will be removed down to an underlying clay marl bed and replaced where

-needed with engineered fill. Plant facilities will be founded

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either directly on the clay marl-bearing strata or,oy, engineered fill, and' thus any potential' problem of to11 apse of ' solution cavities

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or sinks will be circumvented.-

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The applicant has demonstrated that the Coastal Plain strata beneath the site are not faulted (figs. 2.5-6, -7,

-8,

-9, -10, and

-11A) and that there does not appear to be any structural relation-ship of the minor flexure of the clay marl-bearing strata (fig. 2.5-10) with the northeast-trending probable fault that bounds the inferred Triassic basin sediments (Siple,1967; Marine and Siple,1970; and Petty and others, 1965) some 800 feet beneath the site (fig. 2.5-4A, Amend. 15). Any faulting associated with these Triassic basins d'oes

-::35 not appear to have been tectonically active since pre-Upper Cretaceous time.

There are no other identifiable faults or other young geologic structures in the area that might be expected to localize seismicity in the immediate vicinity of the site. However, because the structural features in the basement rocks underlying the Coastal Plain.are so poorly known, epicenters of earthquakes that have occurred in the region commonly cannot be related directly to appropriate geologic features.

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References Marine, I. W., and Siple, G.

E., 1971, Buried Triassic basin in the central Savannah River area, South Carolina and Georgia:

Geol. Soc. America Abs. with Programs; v. 3, no. 5, p. 289-363.

Petty, A.

J., Petrafeso, F.

A., and Moore, F. C., Jr., 1970,

' Aeromagnetic ar.p of the Savannah River Plant area, South e

Carolina and Georgia:

U.S. Geol. Survey Geophys. Inv. Map GP-489.

Siple, G. E.,1967, Geology and ground water of the Savannah River Plant and vicinity, South Carolina:

U.S. Geol. Survey Water-Supply Paper 1841, p. 22.

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