ML19252B615
| ML19252B615 | |
| Person / Time | |
|---|---|
| Site: | Summer  |
| Issue date: | 10/20/1981 |
| From: | Vollmer R Office of Nuclear Reactor Regulation |
| To: | Eisenhut D Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML19252B616 | List: |
| References | |
| NUDOCS 8111040681 | |
| Download: ML19252B615 (2) | |
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OCT 2 0 cket File I98I LB#1 Rdg BJYbungblood MRushbrook WKane HEh0RANDUM FOR:
Darrell u. Eisenhut, Director, Division of Licensing FH0ii:
kicnard h. Vollmer, Director, Division of En ut.W SLISh0LouY INFordlAllou DISCuvEatu RLLAKDthu [
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SUBJECT:
Vir,61L C. SuhriER HULLLAR PLANT SITL - 60ARD v
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At an October 9,1901 meeting witn the applicant, and in a teTep[ione 4
new information which is related to tne seismic issues under liti)at/i)[:[g conversation on October 13,1981, the 14RC staff learned the follriwing d
dt the ASLB hearings:
1.
During the week of October 4,1961, the applicant's consultants learned of the peak acceleratien values derived by tne USGS from the unprocessed Jenkinsville acceleroueter records for an October 16, 1979 magnitude 2.6-2.7 event. These uncorrected peak acceleration values for tne two horizontal and one vertical components are 0.369, 0.339 and 0.15. After correcting 3
for instrument response, tnis record may yield peak accelerations greater than those recorded to date at the Monticello Reservoir. The applicant and staff have only recently received open rile Report 81-1214, " processed Accelerogram from Monticello Dam, Jenkinsville, So9th Carolina,16 October 1979 0706 UTC" which is attached. The staff I.
,..cason to expect that the October 16, 1979 event would yielo such high peak acceleration values since a prior event of a larger "1agnitude yielded lower values.
2.
Tne applicant recently learned tnat in August 1980 the USGS installed a second acceleroueter Delow Honticello Dan 1650 feet from the first (Jenkinsville) accelerometer on the dam. Tnis instrunent has not been triggered to cate.
3.
The applicant suggests that ground notion iecorded at the ULGS acceleroueter on the dr.u may be duplified due to topography. The applicant plans to run field tests tne week of October 19, 1981 to evaluate ground motion recordings at the two b5GS acceleroueter sites.
The applicant nas informed us that they will ootain and evaluate all available USGS acceleroueter data f rom the Honticello area. The applicant inforas us that it will take at least four to six weeks for tne USG$ to process this data. Since this new acceleroueter information has yielded peak accelerations omcq
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Dist DCT 2 01981 Docket File BJYoungblood TERA lEMORANDU1 FOR:
Darrell G. Eisenhut, Director, Division of Licensing
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Richard 11. Vollmer, Director, Division of Engineering FRO 1:
SU3 JECT:
fEW SE1910 LOGY DWORMATION DISCOVERED REGARDING RGlL C. SUW'ER NUCLEAR PLANT SITE
'N At an October 9,1981\\q1eetina with the applicant, and in a telephone conversation on Octoberx13,1981, the NRC staff learned the following new information which isrelated to the seismic issues under litigation at the ASLB hearings:
\\
During the week of Octobe\\4,1931, the applicant's consultants 1.
learned of the peak acceleration values derived by the USGS from the unprocessed Jenkinsville 'hccelerometer records for an October 16, 1979 nagnitude 2.6-2.7 event. 'These uncorrected peak acceleration s
values for the two horizontal and one vertical components are 0.35,
9 s
record may yield peak accelerations \\for instrument response, this 0.339 and 0.15g. After correcting greater than those recorded to date at the Mc'nticello Reservoir. Th'e applicant and staf f have been and are still waiting for the USGkto process and digitize the 1979 and 1980 Jenkinsville accelerometer records: in general and the record of this event, in particula'r The staff had no reason to er.9ect that the October 16, 1979 ivent would yield such high peak acceleration values (albeit un'yocessed) since a prior event of a larger nagnitude yielded lower values.
s\\
The applicant recently learned that in August 198bythe USGS 2.
installed a second accelerometer below Monticello dhn 1650 feet from the first (Jenkinsville) accelerometer on tie dam. This instrunent has not been triqqered to date.
3.
The applicant sunge,ts that ground notion recorded at the 'SGS accelerometer on the dam nay be amplified due to topograph The applicant plans to run field tests the week of October lb 1981 to evaluate ground notion recordings at the two USGS acc$ ero-neter sites.
The applicant has informed us that they will obtain and evaluate all available USGS acceleroneter data from the Monticello area. The applicant infoms us that it will take at least four to six weeks for the USGS to process this data.
Since this new accelerometer info-nation may eventually yield peak accelerations and/or response spectra omer >
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OCT 2 0 3937 Darrell G. Eisenhut and/or response spectra greater than those previously recorded at Monticello rieservoir, this new data should be factored into the applicant's ground notion codel and its ef fect on the plar.t's seismic cesign. Since the acceleration values and time histories have been a significant eleaent in the ons,oing ASLb hearing we recomuend that the hearing board be notified of this new information.
Richard H. Vollner, Director Division of En;ineering
Attachment:
As stated cc:
P. Sobel L. Reiter S. Drocoum R. Jackson J. Knight
- k. Vollmer D. Eisenhut R. Teaesco B. J. Youngblood W. Kane
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Darrell G. Eisenhut 2-greater than those previously recorded at Monticello Reservoir. this new data should be factored into the applicant's ground motion'model and its ef fect on the plant's seismic design.
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Richard H./hollwer. Director DivistorVof Engineering
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P. Sobel
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A United States Department of the Interior Geological Survey Seismic Engineering Data Report PROCESSED ACCELEROGRAM FROM MONTICELLO DAM, JENKINSVILLE, SOUTH CAROLINA, 16 0CTOBER 1979, 0706 UTC by P. N. Mork and A. G. Brady OPEN FILE REPORT 81-1214 Prepared on behalf of the National Science Foundation Grant CA-ll4 This report is prelimary and has not been reviewed for conformity with U.S. Geological Survey editorial standards.
Any use of trade names is for descriptive purposes only and does not imply endorsement by the USGS.
Menlo Park, California October 1981 gj11040685811020 ADOCK 05000395 CF
Processed Accelerogram from Monticello Dam, Jenkinsville, South Carolina,16 October 1979, 0706 UTC This report serves first to document a magnetic tape containin the results of processing the strong-motion data from this accelerogram, and second to reproduce the more important graphical results. The record follows, by a little more than one year, three records that were described in our March 1981 Open File Report 81-0448 to which reference may be made for a description of the site, records, and processing.
Digitizing was carried out by IOM-TOWILL of Santa Clara, California, and USGS processing has produced plots of acceleration at three stages of correction, corrected velocity and displacement, and response and Fourier spectra.
Numerical data is available on magnetic tape from the Environmental Data and Information Service, NOAA, in Boulder, Colorado, 80302; phone (303) 499-1000, extension 6473, or (FTS) 320-6473.
The special processing required for the evidently visible 25 and 35 H1 ;ontent has resulted in the following plots.
" Raw data" signifies the input to the correction scheme, and corresponds to uncorrected data of Caltech and USGS processing. These data are interpolated at 500 points /second, and the plot is labelled " Interpolated / decimated". Butterworth filters whose corner frequencies are 3 db down are used to band pass the interpolated data between the low frequency limit of 1 Hz (with n = 1, first order) and the high frequency limit of 50 Hz (n = 2, second order). These plots are labelled
" Filtered / windowed". The second page of plots for each component contains the acceleration, velocity and displacement with the instrument correction applied. All plots are scaled so that the peak value, listed in the title, fills the vertical axis.
The response spectra plots, both linear and tripartite, contain plots from 1 to 25 Hz, or 0.04 to 1 second. The high frequencies, up to 50 Hz, are portrayed in the Fourier spectra plots.
Tape format The tape celivered to EDIS, Boulder, Colorado for dissemination purposes contains two files:
- 1. Uncorrected data, or the " raw data" of the plots; three components.
- 2. Corrected acceleration, velocity and displacement, as described above; three components.
The tape characteristics are: Blocked, fixed length, 80-byte card image, 2000 byte block size (that is, 25 cards), unlabelled, 9-track, 800 bpi, ASCII.
Reference:
A. G. Brady, P. N. Mork and J. P. Fletcher, " Processed Accelerograms from Monticello Dam, Jenkinsville, South Carolina, 27 August 1978 and Two Later Shocks", USGS Open File Report 81-0448, March 1981.
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