ML20126D452

Summary of Div of Reactor Licensing 700728-29 Meeting in Los Angeles,Ca Re Exposed Fractures of Christiantos Fault

ML20126D452
Person / Time
Site:	San Onofre
Issue date:	07/31/1970
From:	Advisory Committee on Reactor Safeguards
To:	Advisory Committee on Reactor Safeguards
Shared Package
ML20126D449	List: ML20126D447 ML20126D452
References
ACRS-SM-0170, ACRS-SM-170, NUDOCS 8005020104
Download: ML20126D452 (19)

Text

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• Summary on July 28 and 29, 1970, Besulatory representatives and thstr esmemitants from Osos and Decess, Dr. Paes repressettes the Acas, the erster, plus the appitaaet and his seassitants teased the atte area and set in the has Angeles offises of the southern California Edissa Camysey. Spostal attes-tion mes gium to the suposed features of the Christimattes Famit which runs within 3/4 mile of gaa onofre unit i and even stecer to sette 2 6 5 (and 4 & 5). .

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Examination of the overleying terreos deposite at locatisme stems the l

! fault about 16 miles morth and ano mile seeth of the site ladieste that the fault prehhbly has not moved since the terraces were esposited. these l

- deposits are at least 32,600 years old, esserding to sarbon dating techni-p e. ,

l

! Attempts by the applicant te nep the offshore estensten of Christianites and to relate other offshore faults with the active (mapable) Newport-l 1

Englewood and the taastive (incapable) pelisan Bills fastes to the north l . were reisttwely uneuseeesful. .

The applicant una requested to

1. Provide more inferentias to pupport his seasiesian that Christianites bed not moved more than asse in the poet - 't

" ..X 500,000 years. ,

Provide mars"justiftestles that the aerbem dating samples are 2.

truly representative la age of the deposits everlaying Christianitos.

3. provide underwater seendias data, incledLas some proprietary oil soupany data, for the review of Regulatory and USGs, to assist is evaluating the underwater fault astensions., ,e l 4. Determine and justify the pleet ascaleratimas to be supected at the site La the event of Meanituda 8.9 quake sa nearby m eerwater Fault "A", W ah may be an estension of the Newport-taglevoed Fault. .

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• • 1F M e 1970

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visit to site and ' rWina Areas. Julv 28. 1970 ~

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ne group making-the site tour itateded representatives of SEL (5 thel '

4 and Cardone), MS (Minogue). Samos & Moore (Fisher, et al) 208 (Sales 7 i and Yerkes), Deceas (marphy), Marine advisers, San Siego Ses & hetris. '

i Southern Calif. Edises (Ortega, et al), and dCRS (pass and Easd).

+

At Ph=6 Trabuse . ,

An exposure was sweated using helldesers an a hillside shout 14 miles north of the site. D e Christianites Fault and everlying sediments were exposed at this Lesation. Dating of the terrees was through the use of

• used fragments taken about 20' sheve the base rock-terrace Laterfase.

Dr. Fase noted esas gravel in the faulted sans which was not easily on-

. ylhiaet un also geestioned 4ather this fault oss actus11y the Chris-tianitos. b applisant empteased confidence that they were shte to fel-les it from the eseem to this espesure. '

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At the seashore .

N Christiaattos Fault interseets the seastline shout a mile oesth of'thha saa Onofre site. de this point the applisant had escavated for a length of 690' along the seest1Las to espose the sentact between faulted boos rock and overlying terraces. Though slides had oecurred dish severed -

sens of the exposure, the terraces here, as at Flame Trahees, appassed un-disturbed and sentineems. In the faulted same, it une apparent that the '

rock on the east side had slipped myused relative to the west side. .In .

fact, the San Mates sandstone se the west side use met ta evidense sa the east side and apparently has been sempletely eroded ausy learias caly the lower level Capistraae formation suposed. (sets: Fhetes of this area esse taken by the Usos attendees and will he available to the ACES.)

1. h group siso visited and una shown the locatten from skish marine samples (shells) were taken for corben dating the terrace deposits. This area is - ,

about 4h miles down seest from the site. , -.. -

Meetina to SCE offices. Les ^=-eles. Calif.. July 29. 1970 .

N attendanes oss much the sans as the previous day's' plus Dr. 9. Seusner, c , ; ' ..,v. .

a consultaat te SCE. - . ,, . /.,. .w., ,

In response to M L'd previous questions se the geelegy+selsnelogy of'the.. .

San onefre eice,~9Ct providad the handent 62tashment ' '

1. 1, to this soport.

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l The sentents of the attaa h==t ases .. J ,

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1. A seriew of the Christianites Psalt prody teeludtag length,  :, 1 j, disp 1====,=* end aos dettas. .g, II. A seriev of Fasit A and its selationship to other amashy 2 "

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!!I. saa emofra Famit etmey as senated to dBC Geologic and Solands" " '

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17. ce g arisen et'the sea omstre tapestigatise to the holes Iolmed '

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study.

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V. potential ter enshers and effebere landslides thish esm14 affect 4.

the ette. , t ., -

YI. Offshore oil leases and potential subsidense. '

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- Dr. pass quastioned the hesis for semeloding that t'ha fenit had met move 3 mers than ansa in the last 300,000 years. .The applisant stated that there ,,

is me poettive evidense that asletyle anvenants have oesarred. the 990' vertical displanessat in the PsAE should have been 90' asserding to J.'amith

. $- ' af Ceaverse-tevis. The see Mateo formattaa en the uset side of the famit to thought to extend 10' helow the sand level at that point. This gives a GO' '

thick layer of San Mates. .From this they assumed that the vertiset displane.

meat eeund met have been more than 90'. . .

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En summary, the amount of displacement is thought to be no more than 190 - 300' and is met of the order of *h==ada of feet. Dr. Page agreed with the puebable displacement but peinted est that unsch larger displacements gegM, have securred.

The answer to this question is not easily nor obviously attainable staea the r

" enount asked OBGs, of peetfor faulting esas detailed erosion of the Capistrano information as thelaspecific mot kasus. locaties Ier. of YerbesE4the C marine samples. All agreed that an additional here bois to determine better the thicknese of the San Matos would give a better fix en the simimum mesmet of displacement experisaced, although this would met help la eyelasting the' maximum displacement. If the displaeansat is 500' er more, maybe one would have to assume more than one movement la 500,000 yeare.'ancording to Tarkas.

Minogue ebeerved that 80C's feelies ta'that task of evidence..for'asittple

.. maats is met evidense . -

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Dr. Pass asked if there see any seestatent lesattom of the Chrtettaattes steult with lesal topographis testures (alusys at the base of hills, e.g.).

Apparently the fault passes under eeryise topographis Goatures and is very ~

need to tense.

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• Staeussiam gn Part 11 ,

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SC8 baa ta its possessism osefidaattal tesbit ett and etmedard ett esta dish sammet be made part of the pubits record but dish are statlable j for inspection.

' e though the applicant has assumed that the Bewport-laglewood fanit saenests '

7 '.' with the Fault "A" shown La the Pg&R and la Attachment #1, there is as -

, ..elaar-sut oridence that this sammestsea emists. In iast, if the uswport-leglewood is eatended 11asarly, it goes asether to sea than Famit "A".

, Atteges to dellow the eatension using a 30,000 joule sparker unit were *-

.. " ouseessful. If Fault "A" esamests with the pelisse Bill fault, Fault "A" ,

, .has not been astive for hundreds of thousands of years. But, this relattee-ehty saanet be shoun either.

., 'As a design basis, the applicant has assumed that .the largest anyeriensed

. pahe en Esoport-lagtewood feelt Geog. 6.3) is raised to 7.3 and la nosed .

,f . ..f to a point sa Fault "A" appestte the plant. 'fkis gtses 405g at she site. .

1 ... the applisant asemmes 301g for the gas. Sousver, per Ortega, the see Goetre

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.ers 3 projoet though saanested, manager, Sur dee13n they purposes, sammetthe aneums assugt&ons that abese Fault ass"A" made. and Beuport.1e6, igiaansatan am Part til

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BEL and their acessitants pressed for nere documentattaa sa the age of terraces

' and the sample lesattons, and so the invest 13atiems and studies made to leek ior soltiple movements along Chriettaattes to the last 900,000 years. Apparently easy studies were made which don't show (a the resord. the appliaant agrood

,( ,te prortes this informattoa.

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. ' paviav ef Undarvater Data '  ;  ;- ,

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' + Ehere was a presentation and diseuosima of the data which was assumulated "l end enheitted La appendia 28 of the PSAR. It was met sisar to same of the

, , segulatory a:tendees, such as Dr. Pass, that the toterpretattee of this

.dsta would be the same with a dif9ersat interpreter (Dr. Page rosammended

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< 3, privately that the OBGs, she has emperts As the field, leek sleeely at pens * *

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Following a postalansk sameme, the appliaast stated that their posities e' h to the shorellas,it comments

. .' en Fault "A"ita that if Lt does sua mert - e with the Polisan tills Fault d ish to inestive.- '.

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N S ees underweter testa employed "operbers" and "besmers". 'Ebe former uses

,am etestrieal discharge ekteh sweates em et

• 180 spe asund save ubish a

,.V besses off the sesaa bettem and eff laterfases of materiate with Alfdesont

" donettias moder the esean betten. S e " boomer" actuates en a1= h plate

.stestremagnetissily ukish generates a higher frequeasy sound (500 - 800 spe)

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'[ , ; , uhtak gives better resoluttom but Lower penetraties. .

1s m ey, Fault "A" saanet be traced any farther aerth them four milas

,, ,s ; eenth of Dana Pt. (Dena Pt. is ~ 9 miles .

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deusarison with toisa Criteria .

. . " ,5 * %e appitaaet pointed out the differenese between see omefro ad astsas

.," . island vs men-island atte, and metropolitan ve ase-metro site. he mais similarity is that they are both nuclear plants. So, the applisant een-

studes that Bolsa eriteria de met necessarily apply at ses emefru. . , , , ,. .

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. laderphy guestioned the appliaant's statement that a Magnitude 4.0 esake et i l

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.,p.; mas l 5 made udlas only from etally). the tharyby sitefelt would that thegive 3513 50La la a 1swet the site usabar' See this' (this statasse

• l assempties.' Fisher noted that even Messitude 5 ipaakes don't banek does

,* .' h ' > hildings as evidenced by the San Francisco buildings left etendLag after ,

' j She 1906 setastrophe. tharphy suggestad more justifiaattan for the FSAR ,$. -

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• . ',tavamat Proteettoe

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SCE's semelusions here are the same as with Unt: 13 the plant is protected

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• to +24' IER. krphy cautioned that there may met be agreement en this ,

point et this time. hough the SS' IER may be asseptable, thsrply stated

,(, j . that this has not been justified. ,

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~ iemoarison o'f seismic Sitina Criteria CMarch 1969) with..

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.a fhe appliaant is to' 4ubmit a summary en this subject.' He

. . .. es the researches done to justify their;semelestems.,temma y . , 'Q g ' ]

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SEL/pCs unsting *4- July'31., 1979 paastatery tessus s . .,

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, Jer. Bishal asked for sessumate from the attendees se the following genstisms:

_ . . 1. The ChristLanites fault is not empebte

• Br. Pass agreed. . Salts moeded more informaties, possibly en the underwater data to assure that Christianitos does met commeet with Newport-Kaglewood and Sn-etuding eenfirmatiam of the easient age of the fannt. .

1. Es Fault "D" a sentioustian of the Christianitas Famit? A sessensus taas that the raw sparher data obould be evaluated by esperts is that line. ,.

.. ~ 3. Es Famit "A" an extensten of powport-Iaglewoodt Dr. Pass asit that there is no evidence at hand that sit senasets with either powport-

,, Eaglewood er Felisen Rills faults. .

4. Es Felissa Eili Fault taactive? Yorkas agreed as did Salts.

finst Discussion with Amelicant '

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ak. Birket listed the areas in which more informatian should be provided. .

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Atteshmast ,i . y' .

Summary of Susessted Items for Discussion .-"

w/Srief Abstract re: Scope of Investigation and Raasses for Conclusions .

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d! 0.10FIE NUCLEAR GPERATING STATION f __

Ui!ITS 2 AND 3 In the July 15, 19 70 rrecting at Bethesda, questions wem asked thich requim trore detailed answers than provided in the PSAR. Following is a sunrnry of surfssted item for discussion with a brief abstract canceming the scope of the investir;1 tion and reasons for ouc conclusions.

I. A review of the Cristianitos Fault study including length, displace-nont and acp dating.

. A. Are Datine of 'fbrrace Deposits a

Studies by Southwick,1928, indicate the earliest revenent en the fault occurred in post 'early Pliocene tire with the major novenent occurring riddle to late Pliocene or early Pleistocene, depending roon the age of the San Pateo Fonration. The most recent rrovenent occurred prior to deposition of the Marine Terraces which j

are considered at least 70,000-130,000 years old, based upon the 8 approxinnte terrace shoreline angle elevation of 75 feet. Oral cercunication with Dr. B. J. Szabo of the U.S.G.S. in Denver con-finmd that the terraces in the area of San Onorm are 70,000-130,000 4

yearn old, based tren Thorium Protactini.um risequilibrium cleternina-tions en ca ples collected by J. G. Veddcr of the U.S.G.S.

Shell samples obtained from the Marine Terrace section about 4.5 3

niles south of the plant site indicated an a@ greater than 33,000 years, based upcn Ccuton -14 Radionotric dating.

B. Disclacgrnt of the Cristicnitos Fault The Cristianites Fault exhibits no evidence of two cr rrore nove-nents at the ground sitrface in the last 500,000 yeam. Tne cnly data cumpating the possibility of two or more novecents in the last 500,000 yeam on the Cristianitos Fault is the fact that 900 feet of Plic-Pleistocena San Mateo Formation exists at the plant site west of the Fault, but there is no San Mateo Fenration im-trdiately east of the Fault at the coast. This cou3d suggpst at least 900 feet of vertical displace: rent on the Oristianitos during Pleistocene tir.n, assuring that the base of the San Fateo Formation is neatqy horizontal or dipping eastward.

Althou;h data ara inconplete and the stratigraphic relationships are couplicated by at least two unconfornities, the follcuing observations arc.te against the largp displacenent sugfested above,

' and support an estincte of about 90 feet or vertical displacenent on the Cristianitos Fault at the coast:

1. The base of the San Vcteo Fonration is not horizontal, but is, rather, en irmeular sloping surface icpresentinr, an unccn-fornity between the San Mateo and the Capistrano Fonnations.

1 ATTACHMENT #1

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(

2. This surface generally slopes downwattl from the vicinity of the Cristianitos Fault toward the southwest and the plant site,

3. Maxinum observed vertical separation of the uoper surface of the San Onorm Formation (the oldest mcks cn both sides of the Fault-MJ.ddle Inocene) is about 400 Ibet. (21s surface is also an unconfornity and is a highly irmgular surface. Al-though the actual separation may be sonewhat more or less than 400 feet, it exists at least 2-1/2 niles inland.)

4. Maxinum observed vertical separation of the unconfornity between the San Mateo and Capistrano Formations (a Pliocene

surface) is 250 feet. (This separation does not extend com.-

!! pletely across the Cristianitos Fault, and the total separation i!j nny be nom than 250 feet, but not nuch nere because of the b inclination of the unconfornity. This separation exists at

,; least 3 niles inland.)

i

5. The thickness of terrace deposits, the heigtit of the cliff and a the slope stability conditions at the coastal exposum of the

[ cristianitos Fault could have resulted from a total vertical displacenent on the Fault at that point of only about 90 feet, ii 6. Offshore geophysical exploration did not disclose a seawaIxi l projection of the Cristianitos Fault longer than a few niles,

,J succesting that the Fault, and the displacenent thereon, dies

' out seaward.

7. The offshore seisnic profiling data suggest a seaward-sloping C unconfornity between Capistrano anu San Li;eu Fum1tions al; j, shallow depth, a short distance offshore, indicating a thinning of the San Mateo Formation in the dimetion of the Cristianitos Fault.

4 g 8. A water well log in the San Onofre Creek basin about 1 nile inland and 2400 feet west of the Cristianitos Fault indicates the unconfornity between the Capistrano and San Mateo Forma-tions was encountered at approxinntely 115 feet belcra sea level, fbrther indicating thinning of the San Mateo Formation tward the Cristianitos Fault.

l. C. Irnoth of the Cristianitos Fault

l! ,

She Cristianitos Fault is anproximately 25 niles long on land. It has not been traced farther north than about Aliso Canyon by the Califomia Division of Innes and Geolory and the United States ,

Geolocical Survey. The seaward extension of the Cristianitos Fault i dies out within the area of investigation. The total length of the  !

l fault is approximtely 28 niles, h D. Orientation of the Offshore Extension of the Cristianiton Fault i:

Seisnic profiles south of San Onofre reveal that the Cristianitos Fault does not project offshore trith its termstrial M-SSE strike.

Booner lines P 4 throurh N7 and Sparker profiles S-9,14, 20, 22, ,

25, nnd 26 (Appendix 2-B, Pigure 1) crossint; the projected sub- i nnrine extennion of the Fault did not reveal any structural breaks

]

that could be interpreted as the Cristianitos.

i

/ (

r Hmever, southwest of the seal-cliff exposum of the Cristianitos ,

Fault, a distinct change in acoustic appearance and an increase in ~

effective cbpth of seisndc penetration from about 700 feet to about 1400 feet on Sparker profiles, S-21 and S-26 (Appendix 2-B, Pigures 1 and 10) indicate a simificant chang in sedinent 11thology that trends nearly parallel to the coast. Such a chanrp in terrestrial lithology occurs at the Cristianitos Fault where the San Pateo and

• i Capistrano Formtions are juxtaposed by norral faulting (Converse, i Davis and Associates,1970), and this offshore change is prcbably

the Cristianitos Fault.

! The Sparker profiles, S-21 and S-26, parallel the coast. They are believed to have been run within a disturbed zone of a fault 3 labeled "D." (No Sparker traverses crossed normal to Fault "D," '

so the width of the disturbed zone or the exact location of the axis

', of the fault was not deternined. Shallou water depth (less than 40 feet) hanpered data acquisition across the fault and subsequent

,, analysis of the seisnde profiles.) The disturbed zone, labeled Fault

"D," is interpreted to be the seaward extension of the Cristianitos Fault. Thus, the submarino continuation of the Cristianitos tums -

to the southeast and trends subparallel to the coast. The lack of

- evidence of faulting on Sparker records crossing the EM-SSE off-

, l Shore projection of the Cristianitos confirne that it does not strike

.i diagonally across the continental shelf. The Fault trace nust bend to the southeast or terninnte just seaward of the sea-cliff exposum.

i The attached cross-section indicates the generalized tpological intertretation of the offshow sparker data.

A brief myiew of confidential Sparker data provided by an oil conpany supports this interpretation. Sparker profiles south of the plant site which cross the submarine fault projection reveal no evidence of faulting that can be cormlated to the Cristianitos Fault. Theco profiles were recorded to within one-half nile of the beach. Themfore, any seawartl extension of the Cristianitos must

curve to the southeast and die out tithin a short distance.

E. Distance between the Cristinnitos Fault and Units 2 and 3 The scale on the PSAR geolocy drawing 2.9-2 at 1" = 400' is incorrect for the reduced drawing. Unit 3 is approximately 2,600 feet and Unit 2 is approximtely 2,900 feet from the nearest trace j of the Cristianitos Fault.

I 7

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II. A Review of Fault A and Its Relationship to other Nearby Faults A. Possible Northerly Extension of Fault A The study of offshore Pault A centered around its possible northerly extension onshom at Dana Point or Laguna Beach or an 18-dle pre-jection to a possible seaward extension of the Newport-Inglewood Fault in the vicinity of Newport Ecach or other faults such as the Pelican Hill Fault or the Laguna Canyon Fault.

Because of the poor Sparker data between Dana Point and Newport Beach, l l

it is inpossible to daterdne with any certainty the structural rela-tionship of Fault "A" with either the Newport-Inglewood Fault or other  !

faults along this portion of the coast.

Between Dana Point aad Newport Beach, points of possible faulting at the eds of the shelf were noted on the Sparker records. However, record quality in this region does not pemit nuch confidence in either the deterdnation of the existence and location of a fault of the correlation of the fe'ature to adjacent Sparker traverses.

The possible fault crossing are indicated by the dots on Pigure 9 (Appendix 2B); the questicnable cormlation of the fault trace is shown by the " dashed-question-marked line." This interpretation was unavoidably biased by the proxinity of the fault crossings to the shelf edm and by the locations of the Newport to the north and Fault "A" to the south.

, A brief review of supplenentary, ccnfidentcil Sparker data from 1 other sources also revealed very poor record quality between Newport i Beach and Dana Point. The additional data provided little assistance

? in resolving the relationship of the faults in question. However, zones of pessible faulting wem noted at the shelf edge end en the continental slope. The oil conpany data is available for review by AEC staff but cannot be subdtted for public record because of its

] proprietary nature.

d In surrary, the relationship of Fault "A" with the Newport-Inglewood Fault could not be resolved because of poor record quality due to 3 the geology of the area. A possible connection or intersection of the two faults is undeterninable with data used for this shelf structure investigation. Additional pophysical studies would prchably be unproductive.

Another fault that is a nore likely correlative with Fault "A," an interpretation perdtted by the offshom Sparker data, is the Pelican 11111 Fault. Tne Pelican Hill Fault has the following characteristics,

1. It is a northwest trend $ng fault lying between the San Onofre Nuclear Generating Station site and the Newport-Inglewood Fault;

2. It juxtaposes rocks of Middle to Upper MLocene ap;

- - . ~ . . , - . , v -w- ~ ..ng, - m,--x--ve- -

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3. It is overlain by nonmarine termee deposits at Encrald Bay, and by nnrine termee deposits at elevation 600 feet (probably seveml hundreds of thousands of years old) at Pelican Hill;

4. It originated during Middle Miocene time and does not displace stmta of early Pliocene A EP.

If Fault "A" is correlated with the Pelican Hill Fault, which is likely since it lies east of the Newport-Inglewood Fault, then based on the above characteristics, Fault "A" has not displaced the ground surface in hundreds of thousands of years.

l

, B. Possible Southerly Extension of Fault A The linear, cantinuous trace of Fault "A," its disturbed zone, and its northwest-southeast strike suggest that "A" is a structural featum which could extend to the southeast of San Onofre. Fault "A" was traced anproxiuntely 10 ndles south of San Onofre to the southem i lindt of the area investigated.

A brief inspection of confidential oil conpany Sparker data indi-a cated possible faulting at the edge of the continental shelf south of the stutt/ area. Sparker profiles beyond the southem lindt of 1 the survey area from Oceanside to Cardiff revealed cones of possible

faulting at the shelf edce, sinilar to the location of Fault "A" off San Onofre. However, the exanined profiles had a line spacing of two niles and greater. Such fault evidence at the shelf edge off Oceanside and further south may be attributable to a southerly entension of Fault "A," another unmapped fault at the shelf edte, or a series of short faults, perhaps en echelon with northwest strikes.

C. Data m Nearby Faults Maximum Nearest Historic Principal length Approach Macnitude Sense of Fault (Miles) (Miles) on Fault Movenent Disolacenent San Andreas 500+ 60 8.0 (1857) BirAt lateral 25 niles in Tertiary Tinc San Jacinto 195 45 7.1 (1934) Ritht Lateral 15 niles total Elsinore 120 23 6.0 Beverse 1000 feet horizontal (right lateral) 5000 ft nin vertical Menport- 48 30 6.3 (1933) RLrft Lateral 3000 - 5000 feet hori-Inglewood (on shore) zontal, 4000 fb. vertica2 -

vert, separation 200 ft.

Plio-Pleistocene contact "A" 17 5 Unimcun Unknam Unkncun Cristianitos 25 Unknown Vertical 5000 ft, nnx. at nidpoint (on Normal 90 ft. at shoreline. No short) movenent in at least 70,000-130,000 years

(:

. <: ~.

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, No attenpt was made to deternine the nnxinum potential earthquake magnitude for any fault since there is no factual basis for such predictions.

These data show, as indicated in Appendix 2A of the PSAR, that

, maxinum recorded namitudes and total displacenent epnerally decrease cn northwester]y trending faults in relationship to distance away from the San Andmas Fault.

D. Magnitude of Earthquakes which Could be Associated with Fault A On the basis of our ppologicalinvestigation and experience, it is our opinion that Fault A is connected with the Pelican 11111 Fault. .

We consider that the Pelican Hill Fault is not a " capable" fault.

However, we do not have definitive data at the northward extension

! of Fault A. We have asstmed, for a structure of the significance

' of a nuclear station, that Fault A has an earthquake potential equiva-lent to that of the Newport-Inglewood Fault.

If this postulation were correct, we nust asstne an earthquake as

, large as, or sonewhat larger than the 1933 Iong Beach (Famitude 6.3) earthquake mistit occur anywhem along the Newport-Inglewood or Fault A.

In Califomia, our experience has been that the occurrences of earth- i quakes along any particular geologic structure follows a nor:ral dis-tribution of maEnitude and tine. For exanple, there am no instances of Pagnitude 7 earthquakes occurring unless Magnitudes 5 and 6 shocks s have creviously occurmd. Thus, we have conservatively assum2d that an earthquake of one nnpitude higher than has previously occurred j along the Neuport-Liglewood Fault could occur at the closest approach

of Fault A to the site.

4 4

Another indication of the conservatism of the assunption of a .

} Fagnitude 7.3 is the historical record which has no indication of 1

great shocks occurring to the West of the San Andmas Fault zone.

i From our evaluation of the ppology and ceismology of the area, we j believe that this assunption is reasonable and conservative for desim purposes for the planned nuclear units. The postulated occurrence of a Famitude 7.3 earthquake along Fault A results in Intensity IX Levels and ground accelerations of less than 4% of gravity at the site. '

The final design of the structures in accord with the reconnended design soectra presented in the PSAR would acconinodate an earthquake larcrr than any recorded in the region including the unlikely event of a naxinum hypothetical Fnmitude 8 e,arthquake postulated on the Newport-Inglewood Fault.

I L51TL.

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1 1

T III. San Onofre Fault Stu%r as Related to AEC Geologic and.Seisnic

} Criteria of March 1969 A. C@ ability of the Cristianitos Fault me Cristianitos Fault has been demonstrated to have not displaced the ground surface in the last 70,000-130,000 years. The Fault does not exhibit evidence of one or more displacenents in the last i

500,000 years, and the ann 11 amount of total displacenent on the i

' Fault in the vicinity of the San Onofre Nuclear Generating Station site suggests that it occurred during Pliocene-early Pleistocene tine-its inferred period of najor activity. It is not associated with any instrumentally well-deternined ceisnicity.

During its early history, the Cristianitos Fault was connected with and genetically related to the Whittier'Elsinore Fault, a " capable" Fault by proposed AEC criteria. Mcwever, subsequent activity on the Whittier'Elsinore Fault has produced a dense pattern of diveme  ;

faults that intercede between it and the Cristianitos Fault for a '

distance of about 15 niles. The evidence of greatly different ass  :

of last displacenent on the Cristianitos and Whittier'Elsinore Faults,  ;

testifies to the apparent lack of coupling between the two Fhults,  !

and, thus, they are no loncpr related in a nenner such that the 4

Cristianitos Fault nny be considered " capable." i The Cristianitos Fault is not cannected to the Newport-Inglewood Fault, and no evidence is exhibited of a spnetic relationship between the two faults.

Therefore, the Cristianitos is not a " capable" Fault.

B. Canability of Fault A Fault A also exhibits no evidence for recent vertical displacenent,

, at least since the offshoru c1cpe was truncated by wave erosion dur-ing rising sea levels which have occurred since the last glacial epoch.

Tnis fault also lacks nnero-seisnicity.

If Fault A is assured to be connected with the Pelican Hill Fault, then Fault A is not a " capable" fault for the reasons demcnstrated by the characteristics enurrerated in Section II.A above.-  !

If FaultFault Fault, "A" is assuned to be connected with the Newport-Inglewood "A" night be considered a " capable" Fault. If so, its

" control width" is approximately 3-1/2 niles, based on the distance  :

i between Fault A and the south end of Fault C. In this case the i San Onofre site is outside the hypothetical " control width",of Fault A.

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IV. Corroarison of the San Onofre Investisration to the Bolsa Island Study 1

There are no obvious differences between the resu';ts of offshore sparker studies conducted for Bolsa Island and San Onorm. The equip-l nent was the sane in several cases. The major difference was that

! off San Onofre no good reflector horizons were indicated which are j conparable to the "A" and "B" horizons encountered at Bolsa. Also, ,

i at San Onofre the shallw reflectors are in part nasked by a thin  ;

layer of sand and cobbles. Bolsa Island consisted of about 150 miles t of sparker survey in a small area while San Onofre offshore surveys  !

included approximately 200 niles of sparker, booner, and sido scan  !

, sonar surveys over a 33-mile section of coastline. Fcr the San Onofre '

study, data was reviewed on an additional 400 niles, which ccnfinted i the fact that the data for San Onofre was the bent cbtainable using equipnnnt available at this tine. The Bolsa Island study of the '

Newport-Inglewood Fault supports the location of the possible seaward f

extension of the Fault in the vicinity of Newport Beach as shwn in Appendix 2B.

[ Much of the detailed study for Bolsa Island utilized equipnent with g greater resolution and lesser penetration than that used offshore l of San Onofre. The sub-bottom profiling characteristics of the equip-nent utilized at San Onofre are summarized belm:

I

Sonrker Econer Source frequency 80-120 Hz 500-800 Hz Pcwer level of source 2000-3000 joules 500-1000 joules

) (electrical enercy)

Usual penetration belm 800 ft. 70 ft, sea bottom Depth of sha11mest detectable 70 ft. 10 ft, geologic data below coa bottom

)

Resolution (thickness reflecting 10 ft. 2 ft.

layer for detection) l Plninum throw of fault for detection 10 ft. 2 ft, 1

l 1

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. I i

I V. Potential for Onshore and Offshore Landslidos which Could Affect the Site

?

A. Offshom Iands11 des i

j The attached profile shcws the ocean bottom profile off San Onofre

,j out to the base of the continental slope. The drawing illustrates the gentle bottom slopes of less than 1 out to a depth of about 100 nete m. Beyond this point out to depth of about 800 noters the slope is about 5 . The flat slopes and consolidated natum of the offshore sedirents preclude the possibility of offshom landslides which could affect the plant.

4 B. Onshore Landslides Landslides are indicated on the geologle map Drawing 1, Appendix 2A, One largp landslide crea occurs along the sea cuffs, 3100 1 feet dcwn coast from Unit 3 whom Capistrano Formation has been upilfted on the east side of the Fault. 'Ihis landslide is active but dces not m1 ate in any way to the plant which is founded in dense San Fhteo sand.

i l

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l VI. Offshom 011 leases and Potential Subsidence

} There are no oil leases offshcru of San Onorm. Further, it is our understanding that new legislation by the State of Califomia will prohibit offshore drilling in this ama.

! It is cenerally believed that the oil provinces die out to the south

)

and that their is little evidence to sugt;est that oil production night be emocted in the futum south of the City of San Clermnte, n

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