ML20235X741
| ML20235X741 | |
| Person / Time | |
|---|---|
| Site: | 05000000, San Onofre |
| Issue date: | 08/07/1970 |
| From: | Hack J INTERIOR, DEPT. OF, GEOLOGICAL SURVEY |
| To: | Cardone T US ATOMIC ENERGY COMMISSION (AEC) |
| Shared Package | |
| ML20235X376 | List:
|
| References | |
| FOIA-87-462 NUDOCS 8710200101 | |
| Download: ML20235X741 (4) | |
Text
.
e
.#. -, as
- o
- .. "gws
.J rs.... _, a:>.. t c.
-... c..
..cm
,w
, -. m
.n.# 0 4 >.. m s, _.Ta664...
b._*
..\\.
.*.. _. _. v.' '
o \\.... c,.'
I I..4
.4
\\-
,Q
'/
G 2C OGICAL i.U.;VIY q.,
WASH;.NGTON D.C. 20242 i
wn
.n... c +o n,
.g.0 i
Mr. D.ocas Cardone Site Environmental 2 ranch Division of Reccter Licencins l
U. S. Atomic Energy Corr.ission 4915 St. Elmo Avenue Bethesda, Maryland 20014
Dear Mr. Cardone:
l Enclosed for your infornc. tion is a ce= _caduc report prepered by Dr. E. H. Salt: concerning a geoloty field review of t't.e San Ct.cfre l
i s
..uclear Generating Stction, Califernic (.t.20 Doc.et No. 50-361 ccd I
j l
50-362).
Ei.^.ccIOly yourS,
/
/
e y,_
- ;a l
/
~
' John O. Each Assistant Chief Geolosict Enviren=antal Geology Copy to: Mr. Leonard Murphy 8710200101 871014 PDR FOIA SCHARA87-462 PDR l
3 s
i i
Memorandu: Report E. H. Salt:
AuSust 7, 1970
.-l Southern California Edison Co. and San Diego Gas and Electric Co.
1 San Onofre Nuclear Generating Station Units 2 acd 3 j
AEC Docket Nos. 50-361 and 50 ^62 i
l Geolomy Field Revieu
/
The San Onofre Nuclear Generating St: tion, San.L3 ego County and another area in Grange County, Califcrnia, were visi;ed July 28 by E.- H. Saltz and R. F. Yerkes (USGS); leonard Murphy (C ar.d GS); A. T. Cardone, R. A.
l 31rkel, and R. 3. Minogue (AEC Regulatory Staff); J. Hard and Een P&;e
{
(ACRS); and O. Ortesa, P. West, G. Hunt and consultants (Southern I
California Edison Co. ).
On July 29, a nceting was held in the offices l
s l
of Southern California Edison to view and discuss geophysical data on marine Geology of the Dana Point-San Onofre region pre;ared for the applicant by Marine Advisors, Inc.
l The field examination of the sea cliffs and trenched exposures at San Onofre Bluffs supports the applicants' conclusions in various p rts of the PSAR that the bedrock San Mateo Formation is not faul;cd c; the site proposed for units 2 and 3, and th:2 the latest movenants on the Cristianitos fault, about 3,000 feet souuneast of the c. e, occurred before the deposition of the sand, silt, and gravel deposits that cap the bedrock of the coastal terrace in this vicinity. According to the applicant (PSAR, Appendix 2A, p. 22) foscil marine shells from near the base of the terrace deposits 4.5 miles south of the site are more than 33,000 years old, by carbon-14 dating. Field exami_ tion of the fossil locality indicated that articulated pelecypod shells and ur. dica 3ed fragile Eastropod shells occur in a gravely lens near the base of the terrace deposits, apparently in sitt and not reworked frca oldar deposits.
At the Plano Trabuco excavation, about 16 miles north of San Cnofre along the trend of the Cristiani;os fault, stream-terrace dcposius lie undisturbed across a fault exposed by trenching.
According to the PSAR (Appendix 2A, p. 22) the c;e of the im.eer part of those terrace deposits is more than 32,600 years, on thc t.'sia of carbon-a4 datir.g.
However, accordin6 to the applicant, the f ul ct this locality is only one branch, or part, of the Cristiani;os fault, sad its relation to other parts of the fault has not been demonstrated.
1
- m. > se e L___________
4w
.s n -..,c, a..c e,
- 4. c _y..s.p -...o., v.
_ o u...
e..
....,.. ~.....-
a u
,a., _,, c t.... = c.,c.n,,-..a
.~...c. u-o.. a..,.,., v........,...c,.s.~._.
a y_.
....e
.. ~
po sibly as little as 90 fest ne:r :ne coc:t lina, no cca-ilicy ev_dcnce
,...,cen. cec o
,...,s.
t
,.....e...
....s..
- y..
w
.~
~.....
u.
.... o.. e
.uo
\\
..<.4n.....e. a o un.,, c.e c~3 ee..........
. v _- ' -.,
s.
'.y
.. ~
~.
~
... ~..
in the PEAR.
On the basis of world-vice data on the crounta of di; placement that occurred during historic episodea of faulting elaavhere, this amount (900+ feet) of total displacement on the Cristianitos fau:.: cu:;ests that the total displacement was accumulated during cacurren epiccca; cf novement through an, as yet, undetermined perici cf time aftcr dc;osition of the San Mateo Formation ani before the deposition of the terrace deposits.
Frc= all the abova> it a.t.acars that the c.n.nlicant has descactr;ted only that the latest mcVenents on the Cric;ianitos fault cccurrel scra than 33,000 yearc ago in the vicinity cf scn Onofre Bluff.
Censt_; ants to tha applicant expressed the belief that tha terr;..a.: 1 n Ct.ofra Iluff mi;ht be tore than 100,000 years cid, en t'.3 be.;is cf radic=etric dating of fossils frca other terr:ces farther north alen; the ccast. hcuevsr, data on geographic and stratigraphic occurrence of thace foccils h:.3 not been presented, nor has evidence concerning the geolcsic rel;. ion of the dated terraces ;o the terrac: at San Cnofrc 21affc.
It cpp. rs that the a.n.olican.'s enshore racic c investi. icca to date t;v. ne have shown that the 11:est scvemen:
en the Cristiani;cc fcult are s u.< >< 1 e.n.. u./
o.
o
.. _ c., i n.,~, r....., c.
u,.. <
<. a y-. v v_.__v.._. c. t. s,.,.
.,<,/e
~...-._
Regulatory criteria, for the fault to be cons _ der:d as in:c;ive (not "ca pable").
The neo.ch"sical data, en which the cyplican;'s interpratationc of offchcre a
s geolcgy are baced, were enatined briefly duritz the ree:1c; en July 29 Che s.tarker trefiles a.t.ocar to be of adequate quality to provide sur. ort for scce of the interpretations) but not fcr otherc. Accordine to the a
applicant, the data are not cder.unta frc: Ebout E;na point certh to determine if offshore fault A connects with the offchore entencion of the Newport-In31eveed (historically, seismically cotiva) faul; cone, or if fault A connects with the offshora entensica of the inactive Pelican Hill fault. A determina ica of the actual relaticcchip (or conservative assun;tions if the relationship? is not deter.:inable) vill be of considerable 1=.tortance in establishing.c desi.en basis earthquake.
The applicant precented interprotctions to chov that the Cricticnitos fault changes its characteric;ic northerly cash ca trand a th0rt distance offshore and bends scuthecc: to parallel the shcre line.
The de.;a for this conclusion are subject to other int 2rpretations and, at pres at, it does not appear that the offshcre po ition ccd exten; cf the Cristianitos fault have bean ectabli.nad.
Offshcre linear ctructur;l features includin; a possible fcult and a putative syncline, ccour aien; the projecticn of the cashore trend cf the Or_cticnitos fcult.
Acccrding
_2
. ',... m
. w ~ 3 d o.. 4 4 m
e,
& s. v,
..., 4 e,.,.*.
w v, 4.......)
, v.. _., A, r. _. z C,,a
.a os.
.w w w.. w.,
wv w.
_v, K. n _.
,u.,., n.., y.,
1 a-a
.a, g.1..
go.., g g.e. m.,.,. 3,. p_s
+..,, 3.*.,,, 3,..m,.
.s a w w.
6,.
i w
w
. v w. w..
.j
- v..e., < w..a e,4.4
,4 '..'.*w.#. w^.^. o# ' l'.". c' ',, ",, ;~.'.W,.*..#.'. '.'
w
- ^*
'.. '.. '.. ~. '. ' ~. ~. '. '. '. '.. '.
w....-
^
v s..
C C'w CV.
- * '. ~., *,,.."."w w"".'.' '.' ' c 'w' u" ". #. C.* "., "^
d e
.. "' d s,'...' e f ^v.~*
.,..a.
.3 C
........ -. u.
a../
"v.^.
o s. i.,. 4
,.. h w,. t.. c. s C.....!.
.. C.o c.
t
...,.... w s.
u w
( n.,.,,,ga _ n )
_4.,,. t e....., c_s i, s...
3
.~
w The applicant was requested to' provide addi;icnal doct=cc.:,.:1ct. concerning the age of trarine terraces ncrth ar.'. Ocu'.1 of San Cncfre, and geole;ic evidence of their her. ring on dating tre late.t ctcces of ecy,;. sc.;
c.'
the Cristianitos fault. The a.c.clicant w:.3 also re:1.ested to.trovide copies of the offshore geophysical, data for a rare the.,rouch c::aninction by the Resulatory staff and its consultants.
Che applicar.t vcs c..:cd
+ o gurgu..e~ de.**.ne t>...' *_. ".~~ c*w c*.w.., ~_..'..r' - ~. % ~. ~.~.... "=. c e - " '. ' _ _ ~ ^ "
1 w
_m a.. -
par.el repcrt cn the geclosic cc.d ssic Olc;ic cc. _ a nct.., for e,J.,: S:.
Oncfre cite.
l f
4 I
\\
l 3
- - - - - - -