ML20235C676

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Forwards Review of Geology of Plant,Per Request
ML20235C676
Person / Time
Site: 05000000, Zimmer, 05000359
Issue date: 12/17/1971
From:
INTERIOR, DEPT. OF, GEOLOGICAL SURVEY
To: Muntzing L
US ATOMIC ENERGY COMMISSION (AEC)
Shared Package
ML20235B311 List: ... further results
References
FOIA-87-111 NUDOCS 8709240531
Download: ML20235C676 (5)
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DEC 171971 ~

3 cu Mr. L. Yunntn;; l'unt .inr, A J ,, ,

of reetor or 1:er;uletsone p; I' 11.' to. I,tomic Encra,' Ccc.mlacton " DEC211971

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473$ fit. ):.1uo Avenue 9."l$jmf Bethenda, l'.urylt.nd 2M161 i, f e.-s..

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Daar Mr. I:untzin;;; 4 ,

(3 Encloacd in recicn'ac to your request is a review of the (;eolos of the 11. }!. Z1.r.mer : oc2 car Fo.ar ste tion site in Ohio, AEC Docketo 1os. 50-353 cnd 50-3-). 7 A revle.t of the hydroloS ic c:,pects of the site v.::~ not requ sted.

This reviev ves pre;nrod 17 E. }!. Ib3t: tad har. been tiacussed with members of your etnrf. t/c have no ob,)cetions to your r.a).in; this reviev c ycrt of the pub 2f c record.

Sincerc]y youro, i  !

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I 8709240531 870921 7'( f^ 2 /

PDR FOIA MENZB7-111 PDR ,

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t-il Cincinnati Gnc and Elcet,ric Company

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] W. H. Zir acr Nuclear Fouer Station, Oh!o

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,i Coolo v l The ansluis of the ceolog of the V. H. Zir.cr .Huclear power Station, as presented in AEC Lochet noo. 50-359 and 50-359 and 1

amendments, was reviewed and compared with published literature.

The analysis appears to have been carefully derived and to have considered the geolocic conditions pertinent to an engineering .

l evaluation of the site. J

>l The site is in Clarr.ont County, Ohio on a flood-plain alluvial

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terrace on the east bank of the Ohio River. In the vicinity of the )

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site the terrace is about 2,300 feet vide and has an averace elevation f of about k9 5 feet. The vest eide of the terrace is a bluff which 1

rises about 40 feet above the normal pool elevation of the river. At l the east, bluffs of bedrock rice to elevations 300-350 feet above the terraec. The terrace has been flooded by the Ohio River in historic time, and the naximum flood off record, which cecurred in

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1937, attained an elevation of 517 feet. The applicant has proposec a plant-craded elevation of $20 feet to protect critical buildings and vill  ;

provide flood protection to elevation 5k5 feet for Clans I structures.

The cite is in the centrol stable region of North America on the tectonic feature called, variously, the Cincinnati arch or the i

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Indiana-Ohio' plat fom. This brotd atd regiorally extensive arch is believed to have been produced mainly in Paleozoic tirne and to J

have rer:nined tectonically relatively inactive since that time.

The Paleozoic sedimentary rocks at mont' places on the arch are l nearly horizontal or are ficxed Cently. Faults occur in the c

Paleozoic rocks and in the underlyin6 Preca:nbrian crystalline basement rocks at picces on the arch, but geologic mapping and subsurface investigations by the applicant indicate that faults are not present in the Paleozoic bedrock at or near the eite and faulting does not appear to present a hazard to the Zimmer Station.

The nearest knovn fault is the Maysville fault which approaches to within about 30 miles southeast of the site. Bis fault is believed to be probably of Paleoso'ic age and older than the Irvine Gravel of

-Late Tertiary age. We closest reported earthquakes (intensity III-V HM) occurred near Maysville, Kentucky, approrucately 30 miles from the l site and sicht be related to this fault. Two other earthquakes of s

similar intensities occurred also near this fault about 60 miles southeast of the site. I Other historic earthquakes of lov to moderate intensity have occurred on the Cincinnati arch northwest of the site and in the region 60 to 120 miles north of the site. The larEest of these (intensity VIII m) occurred in 1937 in the vicinity of Anna, Ohio, about 120 miles norQ of the site. A relationship of these earth-quakes to specific ceologie structures in the Paleo:oic rocks or in I

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'i the underlyf n? precc .1 Jen crynf.c1]ine tose.~..nt rochr. o." th ? arel. hac not been ciently estat liched tcccuse of the pnecity of 'nfo:.r2. tion i

i concernin,; the deep 1:< Luried 1ccement rocks. Consequently, the possibility'that eartho.uakes sit.flar to the Anna evento nicht ocetu-l ' at other places on the arch cannot te preclud xl. The applicant han f aantz:ed conservatively, for design purposen, that an earthluab havinc f an intencity similar to that of the 1937 Anna event could occur en the I

'i Cincinnati arch near the site.

,e i The flood-clain terrace at the Zim.cr Station consists of uncon-

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solidated 'ediments of Pleistocene and Holocene ace that lie on bedrock l conciatin; of dence Ifmectone and chaJe of the Lexincton Fon:stion of

! Ordovician age. Borings s.ade by the appliccnt at and r.ect the site' i

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, indicate that the Pleistocene-Holocene aedimento consiet of surficial cicy and interbed,1ed nilty sand, 30-35 feet thick, and underlying L

vater-saturated cand, cilt, and cravel 50-CO feet thick. Field and laboratory tests by the applicant: indicate that the sediments belov elevation 450 feet are r. ore dence and compact than the overlyire s ediments . Analyses, boced on these tests, indicate that durinc 1

the assu .ed conservative design-ta:1c earthquake, the cediments above elevation 450 feet micht be subject to liquefactf on. The re fore, the applicant has indicated that, for all Clas I structur.:c, the found-ation raterjah vill be excavuted to c1cvation 450 feet and replaced by fill coqocted to a relative den:1ty of at 1 cast SS p:reent.

Clay blanketc vill b._*

1 aid in the excavations to r.e} crate the rmtural 9

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i sediments frora the compacted fill and to retard inflow of ground water l J

l and prevent exceesive pore pressures from occurring in the fill in i i

the event of high ground-water levels related to flood stages of the Ohio - ;

I River. Peizometers will be installed to measure ground-water.

Rydrolo:!y r

l. %drologic aspects off the site were not reviewed by the Geological Survey, i

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