ML20237G207

Forwards Request for Preliminary Site Review Re Seismological Characteristics of Proposed Reactor Location by Nov 1966,per Seaborg to Admiral Karo.W/Nine Oversize Drawings

ML20237G207
Person / Time
Site:	Diablo Canyon
Issue date:	10/07/1966
From:	Case E US ATOMIC ENERGY COMMISSION (AEC)
To:	Murphy L COMMERCE, DEPT. OF
Shared Package
ML20236J368	List: IA-87-214, Discusses ACRS 92nd Meeting on 671207-09.ACRS Completed Review of PG&E Application for Const of Nuclear Unit at Diablo Canyon Site.Facility Can Be Constructed W/O Risk to Public Health & Safety ML20236J366 ML20236J587 ML20236J622 ML20236J671 ML20236J804 ML20236J841 ML20236J985 ML20236K008 ML20236K057 ML20236K327 ML20236K351 ML20236K384 ML20236K422 ML20236K563 ML20236L228 ML20236L279 ML20236L316 ML20236L364 ML20236L420 ML20236L474 ML20236L565 ML20236L647 ML20236L689 ML20236L706 ML20236L724 ML20236L756 ML20236L787 ML20236L806 ML20236L866 ML20236L901 ML20236L922 ML20236L931 ML20236L986 ML20236M007 ML20236M024 ML20236M065 ML20236M681 ML20236M725 ML20236M744 ML20236M771 ML20236M777 ML20236N015 ML20236N032 ML20236N085 ML20236N115 ML20236N139 ML20236N193 ML20236N208 ML20236N255 ... further results
References
FOIA-87-214 NUDOCS 8708130358
Download: ML20237G207 (35)

Text

- _ _ _ _

r Distribution Suppl. (Proj. 'No. h19)

DEL Reading R&PRSD Reading l

bec:

E. G. Case P. Norian OCT 7 E

g, geye11 R. S. Ecyd Mr. Iconard krphy Chief, Seismology Division U. S. Coast & Geodetic Survey e

ESSA - Washington Science Center O ~ 173 Bldg. No.1, Rm. C-23 Rockville, Maryland 20235

Dear Mr. krphy:

In accordance with the understandings which were reflected in Chairiaan Seaborg's letter of October 3, 1963 to Admiral Karo, I am forwarding herewith a request for a preliminary site review submitted by the Pacific Gas and Electric Company. 'this review involves the siting of the Company's proposed nuclear power plant at its site near Diablo Cenyon, California. As you vill note, this site is quite near the Cayucos Site previously reviewed by the Coast & Geodetic Survey.

We would appreciate receiving, by early November 1966, a draft report of the results of a preliminary review by the Coast & Geodetic Survey concerning seismological characteristics of the proposed reactor location which may have a bearing upon our evaluation of the suit.

ability of the proposed site. Please note that the information con.

tained in the enetosure should not be released or discussed publicly at this time.

w Sincerely yours, Original signed by E. G. Case Edson G. Case, Assistant Director Division of Reactor Licensing

Enclosure:

Preliminary Site Rpt.

8708130358 870729 PDR FOIA CONNERB7-214 PDR

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Consulting Geologist

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RICHARD H. JAHNS 2312 BRAMNER DPM MENLO PARK, CAUF09NIA 94(J)e l'

December 11, 1965 Mr. F. F. Mautz Chief Civil Engineer Pacific Cas and Electric Company 245 Market Street San Francisco, California 94106 Dear-Mr. Hautra This letter is in reference to the brief geologic in-spection-of the Diablo Canyon Power Plant Site, San Luis Obispo County, that you and I made on December 1.

The most critical portions of this site occupy a broad topographic bench, about 1,000 feet in average width, tha t extends alonF the irregular coastline.

The bench represents a platform of Pleistocene marine erosion, and is underlain by marine and nonmarine deposits of Pleisto-cene age.

These deposits in turn rest upon a structurally complex assemblaf e of volcanic and stratified marine sed-g imentary rocks of Tertiary age; bedrock exposures are es-sentially continuous along the present seacliff, and are abundant along the walls of lower Diablo Canyon.

The bodies of volcanic rocks s'nd the stratification of the associated sedimentar.y rocks are moderately to very i

steeply inclined, and it is clear that the bedrock section l

has been affected by large-scale folding.

Several faults also can be observed, but none of them appears to be large in terms of displacement.

I noted no evidence of fault offsets involvinF the bedrock platform, i.e., the contact between Tertiary bedrock and the overlying Pleistocene terrace deposits; this suggests that the youngest fault-ing in this coastal area occurred at-least 120,000 years ago.

i My preliminary opinion is tha t this site can be regarded as feasible for the use under consideration, so far as~

geologic factors are concerned.

Additional study mainly in the form of detailed geologic mapping, is recom, mended as a necessary basis for making a firin judgment concerning site feasibility, and for establishing the locations of.

test excavations that would be most useful in working toward a final judgment on site suitability.

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I believe that two or three days of field work should suffice for the geologic mapping of the coastal area,'and i

________.____,_.m____..

Mr. F.

F. Heutz 2

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I am prepared to undertake and complete this work durint l

the present month of December.

As per our informal agree-ment, I shall plan to have a formal statement of geoloF c i

opinion in your hands by January 1,1966, and shall fol-low this with a documented report very shortly there-l after.

Both the opinion and the report will be based i

solely upon my own investi ations.

F 1

Best personal regards.

Sincerely yours,

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Richard H.

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I AGARDH.JANWS 2312 BRANNER ObfVE MMO PARK, CAMPOMA 940M l

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January 17, 1966 MEMCRANDUM FCR:

Mr. Gorden V. Richards, Pacific Gas and Electric Company FRCM:

Richard h. Jahns SUBJEC'i :

Geolo6 c conditions at Diablo-Canyon Power 1

Plant Site, San Luis Obispo Ccunty As c follow-up to my memorandum of December 11, 1965, addressed to Mr. F. F. Mautz, I as pleased to transmit herewith my preliminary conclusions regarding i

the feasibility, in terms of known geologic conditions, of the Diablo Canyon site for construction of a nuclear pcwer plant.

These conclusions are based upon approx-imately three days cf field examination and geologic mapping, and are offered in advance of a report that will be submitted after the mappint program has been~comple-l ted.

Nc attempt will be made te document them in this memorandum, but they cen be retarded as subject to no mere than minor chantes.

1.

Bedrock in the site area is Tertiary in age, and comprises merine shales, sand-stones, and fine-trained tuffaceous sed-1ments, along with a considerable var-iety of tuffs.

All these rock types are firm and compact, although they repre-sent a wide range in hardness and re-i, sistance to erosion.

They should be capable of supporting imposed loads of

Mr. Gordon V. Richards 2

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the magnitudes that could be antici-pated from elements of a power-plant l

complex.

2.

The bedrock section has been trossly de-formed, as evidenced by widespread steep dips of both sedimentary strata and volcanic units.

The effects of in-tense small-scale folding and rupturing can be identified locally, especially in parts of the sedimentary section ad-joining intrusive masses of the volcanic rocks.

Several sharply-defined faults interrupt parts of the bedrock terrane, but no large zones of Ecute or breccia and no other expressions of'lerge-scale

'culting have been recogn52ed.

3 The bedrock is overlain by marine and non-marine terrace deposits of Pleistocene age.

The base of this terrace secticn rests upon a platform of marine erosien.

the are of which can be estimated as at least 120,000 years.

Neither this plat-(;c form nor the everlying sequence of ter-race deposits appears to be offset by l

any fault in the aree.

Evidence for i

such offset was searched for with par-ticular care, notably in the vicinity of t

recognized faults within the bedrock section, but none ves found.

4 Landslide masses are not present within the site ares, and properly designed cuts and masses of compected fill should introduce no major problems of ground s ta bili ty.

5 Althouth some local seepage might be en-countered in deep cuts, subsurface water should constitute no more than a ciner nuisance, most of which probably would be temporary.

6.

No large or active fault is known to ex-ist within the site area or in nearby l

areas.

Moderately severe to severe ground shaking can be expected at the site, however, as a result of major earthquakes alont the San Andress and

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other actf.ve faults et distances of f

Mr. Gordon Y. Richards 3

C tens of miles to the east and north-east.

7 1he possibility of fault displacement at the ground surface within the site area during the planned life of a power plant can be retarded as extremely re-mote.

l In my opinien, the Diablo Canyon Site is a feasible one for the use under consideration, so far as all known geologic fceters are concerned.

Results of the inves-tigations completed to date suggest that a progrsm of j

detailed subsurface exploration, testing, and geologic-l seismic analysis would lead to a favorable final jude-ment regardin6 suitability.

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l Richard ii. - J '

Geologist s

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scuARo n. m ed 2312 BRANNER h8fVE MENLO PARK, CAUPORNIA 94026

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May 18,1966 MEMOR41'DUM FOR:

Mr. Gordon V. Richards.

Pacific Gas and Electric Company i

FRCM:

Richard E. Jahns

SUBJECT:

Geologic investigation of Diablo Canyon Pcwer Plant Site, San Luis Obispo County During the post six months I have been intermit-l tently engaged in a study of the Diablo Canyon area in order to determine its feasibility, in terms of l

geologic factors, as a site for construction of a nuclear power plant.

Preliminary conclusions based upon three days c/ field work were transmitted to you in a memorandum under date cf January 17, 1966.

Fur-ther examination and mapping, focused en the. broad j

topographic bench _ tha t extends elon6 the coastline,

(

was done in March 1966.

No significant chentes in the conc 3usjons offered in my earlier memorendum need be anticipated as a result ef this adattienal werk or the apprcxitua tely one more. day of field s uudy yet needed.

l to complete the geologic map.

Detailed mapping cf the area has been carried out at a scale of 100 feet to the inch, and field examine-ticn of the expcsed rock types has been supplemented by microscopic examination and other laboratory work.

In evaluating the feasibility of this ccastal site fcr i

the projected use, special attentien has been given to:

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1,,

Recognizing existing landslides and

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other expressions of ground instability.

2. ' Interpreting lithology and structure cf the rocks in terms of thejr generel betring strentths and future stabilf ty if exposed in cuts.

3 Recctnizing faults, trccing their extent and attitude, estimatint-their total displaceneat, and determining the age

Mr. Gordon V. Richards 2

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of their latest movement.

4.

Appraising the seismic activity, durinE Recent geologic time,lifornia.

in both this and other parts of Ca 5

Estimating the probability of future fault displacement at the surface within the site area.

On the bas ls of my investigations to date, it is my judgment that the Diablo Canycn Site is a feasible one for the construction of a nuclear power plant.

I capect moreover, that future detailed subsurface el-plcra t.I.cn tes ting of the natural materials, and final analysis,o,f geologic and seismic data will firmly estab-lish its suitability for such use and will provide a basis for appropriate desi5n criteris.

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s L Richtrd h. Ja

.s Geologist l'

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APPENDIX 6 -- Geologic Exploration Trenches

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