ML20042C108

Forwards Response to NRC Question 230.4 Re Applicability of Certain Small Seismic Events at Site

ML20042C108
Person / Time
Site:	Perry
Issue date:	03/22/1982
From:	Davidson D CLEVELAND ELECTRIC ILLUMINATING CO.
To:	Schwencer A Office of Nuclear Reactor Regulation
References
NUDOCS 8203300213
Download: ML20042C108 (22)

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20555 Perry fluclear Power Plant Docket Hon. 50-4h0; 50-441 Supplementary Information -

Geology /Celsmology

Dear Mr. Cchwencer:

Mr. Ibrahim of the Geosciences Branch has requested additional information concerning our response to NRC question 230.4 This information concerns the applicability of certain small seismic events to the Ierry site.

'Ihis letter forwards infonnation prepared by our consultant, Weston-Geophysics, which addresses Mr. Ibrahim's questions.

It is hoped that this information will be sufficient to resolve Mr. Ibrahim's questions.

Very Traly Yours,

??

o Dalwyr

1. Davidson Vice Itesident System Engineering and Construction DRD:

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Jay Gilberg John Stefano Max Gildner Mr. Ibrahim h0h\\

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230.4 Supplemental Answer The response to Question 230.4 reviewed the local seismicity of the " Cleveland area" using information contained in Appendix 2D-D.

It was stressed that in this appendix the seismicity around Cleveland is indeed shown to be lower than that inferred from numerous catalogs which only compile event parameters without returning to primary documentation.

Even the more recent catalog contained in NUREG 1577, published af ter the submittal of Appendix 2D-D to the Nuclear Regulatory Commission (NRC), should not be expected to present a more accurate picture of the Cleveland seismicity, since no special effort was made to research individually all the events ever reported for that area.

The authors of NUREG 1577, were not provided with Appendix 2D-D.

It is the applicant's contention that the basis for concern, as implied in Question 230.4, is greatly reduced if the findings of Appendix 2D-D are accepted.

Upon our request for clarification of Question 230.4, the NRC reviewer stated (oral communication with G.

Leblanc) that the question should be interpreted as referring to the " potential exceedance of the SSE response spectra arising from the postulated occurrence of a small nearby event (distance. equal to or less than 5 km) ".

The reviewer suggested that small events trom either the Italian or the Mammoth Lakes sequences be examined.

Weston Geophysical o

A.

Italian Data Since Weston Geophysical already had, in-house, a.'.a rge number of Italian accelerograms, it was possible to include immediately in the answer to Question 230.4 a table which listed Italian accelerograms of small magnitude recorded at distance ranging from 0.5 km to 25 km, at hard rock stations e.g., San Rocco and Somplago E, and respective peak horizontal accelerations.

None of the individual response spectra were calculated at the time of the original submittal, mostly because the peak accelerations listed were clearly lower than the anchoring acceleration of the Perry design spectrum.

Figures 1-8 present the horizontal response spectra for accelerograms 190, 198, Il21, I128 (5% damping).

These are well below the SSE design spectrum.

B.

Mammoth Lakes Data After the informal request by NRC on November 12, 1981 to examine the Mammoth Lakes data, Weston Geophysical contacted t

the California Division of Mines and Geology (CDMG) on November 12, and the United States Geological Survey (USGS) on November 18.

It was found that CDMG was still in the process of digitizing the large events, and that the USGS digital data f

on smaller events were not yet ready _in " exportable" formated tapes.

At Weston Geophysical's insistance, the USGS agreed to an carly release of a copied. tape via their PDPll-RSX11M system.

This tape was received on December 1, 1981, but without any Weston Geophysical

geologic information on the site conditions of the recording stations.

A directory of the tape revealed a total of 185 three-component accelerograms recorded at six stations.

The data were not corrected.

The M magnitudes for most of the g

- earthquakes for these records are reported by Archuleta et al.

(1981), and those earthquakes with no reported M were either g

not cosidered by these authors or not recorded by Wood-Anderson instruments in Southern California.

This left 145 records for 1 descr bes the distribution of these consideration.

Table i

records for the six stations and shows the ranges in Mg magnitudes and epicentral distances.

4 The epicentral distances for all but ont station (PSl) were available from the computer output of the earthquake location program I!YPOINVERSE;' for Station PS1, the distances were computed using the earthquake locations on the output and the station coordinates given by Archuleta et al. -(1981).

Four of the stations shown on Table 1 recorded accelerograms with epicentral distances less than 5 km.

Table 2 shows that these stations recorded 33 accelerograms with magnitudes ranging from 2.9 to 4.3.

Further contacts with the USGS on February 2, 3 and 4,

~

1982, concerning the geological site conditions, provided only generic information, i.e. the prevalence of.either alluvium or glacial till at' the four stations.

Finally, Weston Geophysical received on March 8,1982. a geological map on the Long Valley a

Weston Geophysical Caldera, by R.

A. Bailey and R.

P.

Koeppen ordered on l

February 4.

Stations were plotted and the exact formations on which they are located were read.

These are included on Table 2; Appendix 1 shows a copy of the description of map l

units, as provided by Bailey and Koeppen.

At present, this geological information constitutes the best reliable data available on site conditions, although it l

offers no details on the velocity-depth profiles that are l

usually provided either through refraction surveys or boring l

l logs.

These descriptions confirm that site conditions at the Mammoth Lakes stations are substantially dif ferent than those l

existing at the Perry site, where a shear velocity of 4,000-5,000 ft/sec has been measured for the Chagrin shale.

On l

l this basis, it would be inappropriate to compare the response l

l spectra of any accelerograms f rom the Mammoth Lakes events with i

j the Perry SSE design spectrum.

l l

l Weston Geophysical

TABLES i

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Weston Geophysical

TABLE 1 MAMMOTH LAKES ACCELEROMETER RECORDS No. Records Range With Mg Epicentral Station Total Reported Mg Distance (km)

PS1 11 10 3.9-6.2 17-27 MGE 48 33 2.9-5.1 2-17 IICP 19 17 3.0-4.9 3-19 FIS 34 28 3.0-6.2 1-19 CON 42 30 2.9-4.9 2-16 CBR 31 27 2.9-4.9 8-26 TOTALS 185 145 2.9-6.2 1-27 Weston Geophysical

TABLE 2 MAMMOTil LAKES ACCELEROMETER RECORDS h'ITII EPICENTRAL DISTANCES LESS TilAN 5 KM Station No. of Records M

Range Geologic Formation g

MGE 8

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- gla ial till ti llCF 5

3.0-3.9 Q

11"Vi"*

al FIS 8

3.0-4.3 Q

- alluvium al CON 12 3.0-4.3 O

- 918 I"1 'ill ti TOTAL 33 2.9-4.3 Weston Geophnical

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APPENDIX 1 I

l Weston Geophysical

a APPENDIX 1 A

PRELI:tILARY rdOL0rdC "4P CF L6.'R val. LEY cal.DE4, 'GO CCU' TY, CALIF 0th A oA.

R.A. Bailey end R.P. Foeppea rs P

This nau was prepared as cart of the U.S. Geological Survey Geotherral lesearch Program, under the general direction of L.J.P.

l'u ffier and R.L. Christiinsen. Pa:oing of the Casa Diablo G3cthernal area (Eailey,1974),

Long Valley caldera, and the asscciated Tertiary and Quaternary volcanic rocks and sedinents was dcne during the suncers cf 1972,1972,1974, and 1975, by R. A. Eailey assisted by R.P. Koeppen, F. A. ','ilson, and T. A. Holecek.

'bening c? the 4acroth Fountain cc:aolex was done by ?.P Koaccen during 1973,197 ', and 1975. The cresertiary geology shoun cn this map has been cenailed ui th ninor chacass fro. the geolo;ic a admngle r.acs of Rine % t auj Ross (if 57,195t), ::aber and Rinehart (1.:EE), Kistler (1956), and

'Mitsh:- a r Ca:e S- (ie nress).

The races 5 some of the grsnitic rcck d

3 units have hcc 093nced to conforn with rare recent usaga of 3atemar, Lcckwood ar..i Lydon (197') and Loc:'ucod and Lyden (1775).

A!so, the designated ages of some of tha granitic units have been changed on the basis of radicmetric dating by Evernden and Kistler (i?70) and racent lead-uranium aces by T.S. Stern (P.C. Bateman and D.L. Fock, uritten cormunicaticn,1977).

NOTE:

2 PLATES ACCCMPANY THIS TEXT s <<

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-- ~ G &

v DE SC21FTI']l: OF 5 TAP U.*i!TS *

• Query following rock syr.bol on r:ap indicates identification of rock unit not firnly established.

SURFICIAL DEPOSfiS ALLUV It:.'t: mainly unconsolidated sand and gra.'el descsited along gg

.ictivaly aggr3 ding streams; also includes decesits in readows and ca rshes.

OLDE9 ALLUVIL:'::

strean decasits under Sing arosion and dessection; gg, includes roost Pleistacene glacial cut <. ash de;csits.

A'.LUVI AL FA*! DEPOS(TS:

fe rr.

fans and naderately qa r.

stee9 alluvial ccnes; generally caui.aient in age to Older Alluvium (Ona).

TALL'S :

angular re:k debris fonting steep cones and accumulations, nairly a. :Me base of cliffs.

CC L'.' "? I U -

loosa, heterogeneous debris and soi! accumulated by slope v-wash and other niss-wasiting prccesses; locally includes deposits of reworked airfall punice and ass.

PHREATIC EXPLOSIO'l DEFOSITS: semi-indurated mud and angular rock g,

debris eruoted during steam exclosicc: from tha Inyo Craters and a few cther snill phreatic explosion cra'.ers on Mamnoth 'iountain.

Also includes sor.e older, nere wide:: read, exolcsion debris from an unkne'in s;urce on or near Mar oth :teuntain.

Age of tha Inyc Crater; decosits is about 650 years (T:inehart and Huber, 1955).

2

1 P.0CK AVALA'!CHE DEFDSIT:

Very course, subungular to subrounded blocks n,.,. q I

as nuch as 2 r%ters in dianeter in a silty to sandy nonsorted natrix; the debris is acnolithologic, censisting alrost entirely of augite-biotite rhyodacito.

Tha uni t fnrns a icbe extending fron the north-east foot of Mamoth !'ountain to the east edge of Itax.oth Lakes 1

tcuosite and is apparently tha result of a rock avalanche off th.?

northeast face of the 10,ll3-fcot satellitic peak on !!amoth t'ountain.

The deacsits predate till cf Tioga glaciation and postdate till of crobable "ono Basin glaciation.

ROCK GLACIER:

Qr9 very coarse angular rock debris in part cenented by interstitial ice; occurs niinly in high cirques in the Sierra :;evada.

CIP.002 "CRAINE:

young giacial till cf fienglacial age in high cirques 7,

i in the Sierra 'weda.

,.g TILL CF TIO1A GL:CICIt. (Black.: elder,1931):

probably about 10,000 o

t: 23,O" years 3.P. (Curry 1971; Evars,1974).

t

,3 g TILL 0F TE"AYA CLACIATIC.1 (Sharp and Cirnan, 1963): probably about t

30,C30 tn 40,000 years S.P. (Curry, 1971; Evans, 1974).

Qta TILL OF TAHOE GLACIATIO i (Blackwelder,1931) crobably about 50,000 to 65,000 years B.P. (Curry,1971; Evans,1974).

q3 TILL OF M0'l0 SASIN GLACIAT!0M (Sharp and Sirnan, 1963): probably about 103,000 to 130,000.aars S.P. (Curry,1971; Evans,1974).

CASA DIADLO TILL (Curry,1971 ) : probably ecuivalent in age to till Ocd of Foro Basin J aciation ( alley, Daleymple, and Lanchere,1976).

l 3

Qsh l TILL OF SHETJI'l r,LACI4T!G'! (31ack1 elder,1931):

les than 0.71 n.y.

old (Shara, 19'S).

i TILL OF cTI "OU1TM' oLACIATIG': (31 a c'.~.iel der, 1931 ) : less than 2.6

{ A n.y. old (Ca i rvs e, 1M3).

3