ML19207A463
| ML19207A463 | |
| Person / Time | |
|---|---|
| Site: | Humboldt Bay |
| Issue date: | 07/05/1979 |
| From: | Furbush M, Locke R, Morrissey J PACIFIC GAS & ELECTRIC CO. |
| To: | Luton E Atomic Safety and Licensing Board Panel |
| References | |
| NUDOCS 7908200047 | |
| Download: ML19207A463 (6) | |
Text
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TERA PACIFIC G-A S A N'D ELECTR,IC C O M PANY 2 6 W'JJ.s l
713EALE STREET. 31ST FLOOR
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Edward Luton, Esq., Chaitaan Q.
Atomic Safety and Licensing Board Panel Of U.
S.
Nuclear Regulatory Commission
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Washington, D.C.
20555 F
p 7
1 In the Matter of Pacific Gas and Electric ompany 4
\\.bs Re:
e (Humboldt Bay Power Plant, Unit No. 3) gy 4
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Docket No. 50-133, License No. DPR-7
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Dear Mr. Luton:
/cl Pursuant to the Order of June 19, 1979, which was received on June 25, 1979, Pacific Gas and Electric Company
("PGandE") hereby submits a Report by its consultants, Woodward-Clyde Consultants ("WCC") on the current status of the geologic investigations involving Humboldt Bay Power Plant, Unit No.
3.
This Report details the most recent activities conducted by WCC as part of an overall investigation plan which was presented to NRC staff in great detail at a meeting in Bethesda, Maryland in March 1978.
In order to place this and subsequent reports in per-spective, we plan to furnish, as soon es possible, a comprehensive outline of the complete program as presented to the NRC staff at the March 1978 meeting.
This should allow for a more meaningful understanding of the current work in the context of the overall program of planned tasks.
We believe this information fully complies with the Order of June 19, 1979.
Very truly yours, JOHN C. MORRISSEY MALCOLM H.
FURBUSH PHILIP A.
CRANE RICHARD LOCKE 4
RFL:md By:
RICHARD F.
LOCKE Enclosure 7 90 8 2 0 0 0'E7
UNITED STATES OF AMERICA NUCLEAR REGULATORY COMMISSION In the Matter of
)
}
Docket No. 50-133 PACIFIC GAS AND ELECTRIC COMPANY
)
License No. DPR-7
)
(Humboldt Bay Power Plant. Unit No. 3)
)
CERTIFICATE OF SERVICE The foregoing document of Pacific Gas and Electric Company has been served today on the following by deposit in the United States mai?., properly stamped and addressed:
Linda J.
Brown, Esq.
Mr. Gustave A.
Linenberger, Member 101 Van Ness Avenue Atomic Safety and Licensing Board 19th Floor Panel San Francisco, CA 94102 U. S.
Nuclear Regulatory Commission Washington, D.
C.
20555 Barry Smith, Esq.
Office of Executive Legal Dr. David R.
Schink Director Department of Oceanography BETH 042 Texas A & M University U.
S.
Nuclear Regulatory College Station, Texas 77840 Commission Washington, D.
C.
20555 Michael R.
Sherwood, Esq.
Sierra Club Legal Defense Fund, Inc.
Secretary 311 California Street, Suite 311 U.
S.
Nuclear Regulatory San Francisco, CA 94104 Commission Washington, D.
C.
20555 Attn:
Docketing and Service Section DATED:
July 5, 1979
[
RICHARD F.
LOCKE Attorney Pacific Gas and Electric Company 809 003
E'n*2".cTfc'A *"MM' 7 Woodward Clyde Consultants 415-956 7070 July 3, 1979 13976C-8116.1.1,1064 072 Mr. Frank Brady Pacific Gas & Electric Company 77 Beale Street, Room 2611 San Francisco, CA 94106
Dear Frank:
Subject:
Status Report on Phase I, Step 3 Activities:
Humboldt Bay Review Per your requesc, submitted is a rr rs on the status of our investiga-tions for the Humboldt Bay Power i.mit as of June 30, 1979.
The ongoing or recently completed Step 3 task; are:
1.
Ongoing mapping and age dating of the Little Salmon Fault.
2.
Ongoing analysis of subsurface data in the vicinity of the site.
3.
Ongoing collection and analysis of strong motion data.
4.
Making a preliminary assessment of the site ground motions due to the SSE to incorporate findings from the geologic and sei:;mological studies.
5.
Ongoing study of the formation and propagation of faults.
The progress made on each of these tasks is summarized below:
Geologic Mapping and Age Dating Studies to Assess the Capability of the Little Salmon Fault The main activities done on this task during Step 3 include: geologic mapping on the Pacific Lumber Company property; collection of volcanic ashes; trace element analjses of volcanic ashes; radiometric age dating of ashes; and review of literature on micropaleontology that might be useful for dating deposits in the Humboldt Bay area.
In addition, the results of some of the analyses and potassium-argon age dating analyses on volcanic ash samples collected in the Humboldt Bay area were received during this period.
Geologic mapping on the Pacific Lumber Company's property was concentrated in two areas.
One area was north of the Litth Salmon fault; the other was east of Scotia.
Consu! ting Eng:neers. Geologrsts and Enwonmental Socntists M
Othcesin Other PnnopalC+es
Woodward.Clyde Consultants Mr. Frank Brady July 3, 1979 Page 2 Studies to date indicate that the Freshwater fault offsets the basal beds of the Wildcat Formation.
Exposures of a thick and extensive ash bed in the basal Wildcat sediments were discovered in the Freshwater area.
This ash bed contains biotite and other datable minerals.
Dating and trace alement correlation of this ash deposit will contribute to our understanding of the movement history of the Little Salmon Fault.
- iapping east of Scotia has delineated an anticline that was not well defined on maps by previous workers.
It has also resulted in the discovery of several new ash beds in the older part of the Wildcat For-mation.
Future work on the dating and trace element correlation of these ash beds should increase our knowledge of the time of formation of the Humboldt basin and its relationship, if any, to other regional tectonic events.
Preliminary qualitive trace element analyses of the new ash beds suggests possible correlations of ash beds on both sides of the Little Salmon fault.
Glass separation has been completed on these new ash beds, and quantitive enalyses which should be available in the next few months include fission track and ootassium-argon age dates.
Analysis of Subsurface Data in the Vicinity of the Site The analysis of the available boring and geophysical data in the vicinity of the site has been completed, and a data summary is being prepared for the project files.
Collection and Analysis of Strong Motion Data Monitoring of strong ground motions at the eight sites selected during earlier steps of the Phase I seismological investigations continued during Step 3.
Data processing is underway for the 14 earthquakes listed in Table 1 which were recorded at several of the stations.
Data from these earthe,uakes have been printed out on an expanded scale, and peak values have beer. read for all the available components. Several selected events were exa.nined spec-trally as part of the preliminary spectral ratio st.udies. Work was also started on attenuation studies based on hypocentral distance plots of peak acceleration.
Preliminary Assessment of Site Groung Motions Due to SSE Preliminary estimates of site peak accelerations, response spectra, and durations of strong shaking for the SSE were developed based on recently obtained data from geologic and seismologic studies performed by WCC and others. Reasonable but conservative estimates of maximum credible earth-quakes that might be applicable were made.
The results of this preliminary analysis were presented orally during the 7 May 1979 project review meeting.
Formation and Propagation of Faults Activity on this task has been limited to compiling and synthesizing avail-able information, and assessing its possible application to the site.
809 005
Woodward.Clyde Consultants Mr. Frank Brady July 3,1979 Page 3 It is hoped that the foregoing has provided the information you desired.
If you have any questions or require further information, please call me.
With regards, g&ja azudw Ashok S. Patwardhan Project Manager AP/cd enclosure; J
809 006
Table 1 Digitized Accelerometer Earthquake Data Latitude Longitude Depth Date Time N
W ___
(km)
Magnitude 16 Aug.
1978 0745 40.364 124.485 15.5 4.0 06 Oct.
2126 40.455 124.534 23.7 4.6 06 Oct.
2142 40.432 124.389 23.9 3.4 07 Oct.
0447 40.480 124.501 22.5 3.6 16 Oct.
0218 40.468 124.528 22.1 3.9 21 Oct.
0548 40.363 124.538 14.7 2.9 29 Oct.
0433 40.352 124.511 16.0 3.3 29 Oct.
0651 40.290 124.649 20.0 3.6 22 Nov.
2303 40.368 124.560 15.0 3.9 16 Dec.
1117 40.984 124.898 27.9 2.9 02 Feb.
1979 0254 40.365 124.483 15.3 3.7 02 Feb.
0541 40.259 124.527 20.6 3.7 03 Feb.
0958 40.885 124.387 23.9 4.8 03 Feb.
1005 40.882 124.371 23.7 3.5 809 007