ML20004F312

Discusses Exam of Util site-specific Response Spectra,Part 1.Suggested Sensitivity Tests Encl

ML20004F312
Person / Time
Site:	Midland
Issue date:	04/03/1981
From:	Kimball J Office of Nuclear Reactor Regulation
To:	Rolonda Jackson Office of Nuclear Reactor Regulation
Shared Package
ML20004F309	List: ML20004F308 ML20004F312
References
NUDOCS 8106180141
Download: ML20004F312 (18)

Text

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C, UNITED STATES NUCLEAR REGULATORY CdMMISSION

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' MEMORANDUM FOR:

Robert E. Jackson, Chief Geosciences Branch. OE THRU:

Leon Reiter, Leader Seismology Section, GSB, DE FROM:

Jeff Kimball, Seismologist Seismology Section, GSB, DE

SUBJECT:

STAFF EXAMINATION OF CONSUMERS POWER SITE SPECIFIC RESPONSE SPECTRA - PART 1 1

I have examined Part 1 of the Consumers Power submittal, Site specific Response Spectra. The collection of real time histories to be used in developing Site Specific Response Spectra is dependent on the following input parameters: range of magnitudes from earthquakes which recorded strong motion, site conditions of the recording stations and the distance at which these records were recorded. What has been submitted by Consumer Power's Consultant, Weston Geophysical, is an analysis which uses a smaller subset of the total data set available by fine tuning the above input para-Response spectra results are. dependent on the selection of this meters.

l subset of data, therefore the sensitivity of each input parameter should be assessed when a fine tuned analysis is undertaken. Attached to this memo are coninents 01 some suggested sensitivity tests th&t could be made on each l

input parameter or combinations of parameters (maonitude, distance, site Both this mano and the attachment conditions)to help resolve this issue.

can be used to inititate discussion for the April 16, 1981 meeting with the applicant.

eff Kimball, Seismologist Seismology Section f

Geosciences Branch, DE

Attachment:

As stated l

/

cc: J night

. Kimball L. Reiter T. Cardone D. Hood J. Kane H. Levin 8106180 /Y/

Attachment 1.

hgnitude Range of Records Selected As listed in Table 2 of the Part i submittal the range of magnitudes used was m = 4.7 to 5.2, M = 4.9 - 5.5 (mean M = 5.35). As stated in the b

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October 14, 1980 letter from the NRC staff to Consumers Power Company, an

= 5.3 +.5 was suggested (this roughly apprcpriate magnitude range of Mblg range of 4.9 to 5.9 using Chung and Bernreuter, 1980).

corresponds to an ML What vould be the effect on the response spectra (84th percentile) of including appropriate records for earthquakes with M 's up to 5.97 g

2.

Site Records Selected Listed below are some uncertainties in the recording site foundation conditions that have been used by Weston in Part 1 of the Midland submittal.

The uncertainties are listed not to reject the specific stations but to provide a basis for the possible inclusion of additional site records which also have site foundation condition uncertainties associated with them.

1.

Cedar Springs Dam Pump House - The Shannon and Wilson site description (SW-AA, 1980) listed 8 feet of alluvium over poorly indurated sandstone with a possible sharp density contrast at 37 ft. While the general description may have some similarity to the Midland site the actual shear wave velocity profile was not ;1easured and can only be estimated.

2.

Gavilan College, Gilroy - While the contrast at about 40 feet matches the Midland site f airly well the shear wave velocity in Shannoa and Wilson (SW-AA, 1980) is listed as greater than 3600 feet per second with the log terminating at 77 feet while figure A-7 in part I continues to about 110 feet.

1,

Golden Gate Park, San Francisco - As noted on page A6 of the Part 1 3.

submittal there is some uncertainty of the "true" subsurface site conditions (shear wave velocity profile). As shown either the velocity j

is comparable without the known Midland contrast at 40 feet or the P

velocity contrast may be present but the shear velocities may be very high.

Southern Pacific Building, San Francisco - As noted on page A2 of the 4.

Part i submittal Idriss and Seed (1968) estimate the depth to rock to be 285 feet. While the upper 60 feet generally fit the Midland Profile this site may be a deeper soft soil site compared to Midland.

krightwood, California - The Shannon and Wilson report (SW-AA, 1980) 5.

only give a description of this site. The actual shear wave velocity profile was not measured (the actual boring extended to 88.5 ft) and j

can only be estimated.

Listed below are stations whose general subsurface soil conditions are known, but the specific shear wave velocity profile is unknown. Based on the uncertainties of the subsurface soil profiles used in Part 1, the i

sensitivity of including the stations listed below should be evaluated or i

their exclusion should be justified. Why have these stations and records not been used in Part 1 and what affect would they have on the results if they were used.

1.

Eureka Federal Building - while at depths below about 60 feet the shear wave velocity is low compared to Midland, there are impedence contrasts at about 45 feet and 120 feet and the shear velocity profile matches fairly well above 60 feet.

San Juan Bautista - Listed as less than 100 feet of alluvium (LLL,1980).

2.

P

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i

! 3.

Cholane #2 - 45m of alluvium, stiff to very stiff clays and silts over dense sand; listed as stiff, stiff soil, deep soil (LLL,1980).

4.

Cholame #5 - unconsolidated shallow soil and alluvium over consolidated f

sand (LLL, 1980).

[

r 5.

Cholame #8 - Thin alluvium; sandstone (LLL,1980).

- 6.

Cholame #12 - 30 m of Terrace deposits over sandstone (LLL, 1980).

7.

Melendy Ranch - Thin medium dense sand layer over weathered siltstone f

(LLL,1980).

3.

Stone Canyon - Contact between Quaternary alluvium and Middle Miocene NoneMarine(LLL,1980).

9.

Oroville CDMG #7 - Cenozoic sediments, Tertiary conglomerate (LLL,1980).

creenstone

10. Johnson Ranch, Oroville - 10 m Tertiary Conglomerate over

~

(LLL,1980).

11. Oroville Medical Center - Cenozoic sediments, Terrace Gravels (LLL,1980).

j

12. Santa Barbara Recording Stations - General descriptions of shallow alluvium over sandstone (LLL, 1980).

i Date Statien Horiz. Accel.

9/4/62 Eureka Federal 5.0

.047,.046 11/28/74 San Juan 5.2

.112,.044 6/28/66 Cholame #2 5.6

.480 6/28/66 Cholame #5 5.6

.350,.420 6/28/66 Cholame #8 5.6

.230,.270 6/28/66 Cholame #12 5.6

.050,.060 i

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'Date Station M

Horiz. Ac;el.

g 9/4/72 Melendy Ra. c!

4.75

.600,.470 n

t 9/4/72 Stone Canyon 4.75

.190,.140 8/8/75 CDMG #7 4.9

.096,.078 8/8/75 Johnson Ranch 4.9

.185, 0.85 8/2/75 Medical Center 5.2

.077, 0.51 I

8/15/78 Freitas 5.1-5.7

.230,.115 8/15/78 North Hall 5.1-5.7

.396,.259 8/15/78 Goleta 5.1-5.7

.340,.283 3.

Distance of Real Time Records Collected As listed in Table 2 of the Part 1 submittal the range of epicentral distances used was 7 to 33 kilometers. What would be the effect on the response spectra (84th percentile) if the distance at which records were recorded was restricted to 25 kilometers and less? 20 kilometers and less? 15 kilometers and less?

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Location of earthquake activity in the Bear Valley area January-September, l

1372. Dotted lines enclose A-Earthquakes, February 22-23; 8-Aftershock l

zone of magnitude 5.o earthquake of February 24: C-Aftershock zone of mag-nitude 4.6 earthquake of February 27.

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earthquake on September 4.

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absolute locations as large as 1-2 km may exist (Lee et al., 1972).

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Tertsary gravets and conglomerates, with occasaonal Tertiary volcanic rocks and undasones: laned arees.

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J9*20.1TN 121*23.07W. and 29'M 4TN.121*:' GW. respectr ely. The bus en dashed lanes encio es all of the afterdocks in Table I ese pc the three r allow events :0::2 Aucsst 2. 20G3 August 2 fpresunwd shallows and 0611 Aurust 11. Most of the peak acceleration data used an than saudy are for earthquakes withm this bos ano :s 3 A s to km.

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