ML19323G051
| ML19323G051 | |
| Person / Time | |
|---|---|
| Site: | Humboldt Bay |
| Issue date: | 05/19/1980 |
| From: | Crane P, Furbush M, Locke R PACIFIC GAS & ELECTRIC CO. |
| To: | Lazo R Atomic Safety and Licensing Board Panel |
| References | |
| NUDOCS 8005300302 | |
| Download: ML19323G051 (6) | |
Text
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PACIFIC GAS AND E LE C T R,I C C O M PANY b b Wil.*.J l
77 BEALE STREET,31ST FLOOR. SAN FR AN CISCO, C ALIFORNI A 94106 (415) 781 4211 uaLcoLun.euaeusn g;3;*.r,;;:=
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Robert M. Lazo, Esq., Chairman Atomic Safety and Licensing Board Panel U.S. Nuclear Regulatory Commission Washington, D.C.
20555 Re:
In the Matter of Pacific Gas and Electric Company (Humboldt Bay Power Plant, Unit No. 3) Docket No. 50-133, License No. DPR-7
Dear Mr. Lazo:
In accordance with the Board's Order of June 19, 1979, Pacific Gas and Electric Company ("PGandE") hereby submits a Report by its consultants, Woodward-Clyde Consultants, outlining the status of the geologic and seismic investigations involving the Humboldt Bay Power Plant, Unit No. 3 together with an outline of the work accomplished during March and April 1980.
The tasks identified in this Report are more fully described in a document entitled Scope of Work for Geological and Seismological Studies in the Humboldt B W Region, dated September 1, 1979, which was attached to PGandE's pending Motion to Hold in Abeyance filed on September 26, 1979.
Very truly yours, MALCOLM H.
FURBUSH PHILIP A. CRANE RICHARD F.
LOCKE By RICHARD F. LOCKE 9\\
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Ippolito Bruce Norton. Esq.
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t Enclosure. I005300SO1p v.
UNITED STATES OF AMERICA NUCLEAR REGULATORY COMMISSION In the Matter of
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PACIFIC GAS AND ELECTRIC COMPANY
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Docket No. 50-133
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License No. DPR-7 (Humboldt Bay Power Plant, Unit No. 3)
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CERTIFICATE OF SERVICE The foregoing document of Pacific Gas and Electric Company has been ;;rved today on the following by deposit in the United States mail, properly stamped and addressed:
Linda J. Brown, Esq.
f.,* Robert M.
Lazo, Esq., Chairman 100 Van Ness Avenue, 19th Floor
' f Atomic Safety and Licensing Board Panel San Francisco, CA 94102
'd U.S. Nuclear Regulatory Commission
- Steve Goldberg, Esq.
Washington, D.C.
20555 Office of Executive Legal Director Mr. Gustave A. Linenberger, Member BETH 042 Atomic Safety and Licensing U.S.
Nuclear Regulatory Board Panel Commission U.S. Nuclear Regulatory Commission Washington, D.C.
20555 Washington, D.C.
20555
- Secretary Dr. David R. Schink U.S.
Nuclear Regulatory Department of Oceanography Commission Texas A & M University Washington, D.C.
20555 College Station, TX 77840 Attn:
Docketing and Service Section Michael R.
Sherwood, Esq.
Sierra Club Legal Defense Fund, Inc.
311 California Street, Suite 311 San Francisco, CA 94104 Dated:
May 19, 1980 l
RICHARD F.
LOCKE Attorney l
Pacific Gas and Electric Company I
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- Express Mail
KM3 muun Woodward Clyd::) Censultants m.. E..,c.o.,o c.e,.,.S">'2 7 "
San Francisco. C.hfornia 94111 415 956-7070 May 14, 1980 13976F-5216.1,5216.2 187A M r.
Frank Brady Pacific Gas and Electric Company 77 Beale Street, Room 2611 San Francisco, CA 94106
Dear Frank:
Subject:
Progress During March and April, 1980 -
Geologic and Seismologic Studies, Humboldt Bay Review This report summarizes the geclogic and seismologic investigations for the Humboldt Bay Power Plant during March and April, 1980.
During the period, regional mapping and age dating, l
late Quaternary studies, deep borings at the site, geophysical data analysis, acquisition andl pnalysis of strong motion data, seismologic data anlysis, and > earthquake ground motion studies continued.
A program of seismri'c wave velocity mea surements and standard penetration tests wass begun at a location near the containment structure.
The purpose of the studies was to obtain additional information on the geologic structure at the site and its relationship to regional tectonics.
Specific tasks included the following:
1)
Regional Geologic Mapping and Age Dating 2)
Late Quaternary Geologic Studies and-Fault Capability Evaluation 3)
Identification of Faults in the Site Locality 4)
Seismic Wave Velocity and Standard Penetration Tests 5)
Geophysical Data Analysis 6)
Seismologic Data Analysis 7)
Site Specific Carthquake Characteristics 8)
Earthquake Ground Motion These tasks are described in the Scope of Work for Geological and Seismological Studies in the Humboldt Bay Region, dated September 1,
1979.
The progress made during the period on each of these tasks is summarized below.
Regional Geologic Mapping and Age Dating Work continued on radiometric dating, trace element analysis, and the preparation of interim summaries of existing data.
Field mapping south of the Eel River and drilling for paleomag sampling at Thompkins Hill was begun.
A review of the literature concerning the origin of offshore structures identified in
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seismic data was completed.
Consuttng Engineers. Geologists and Environmental Scentsts g
D C5ces e Other PnnccalCres
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Frank Brady May 14,,1980 Page 2 Paleomagnetic age dating samples were obtained at about 10 feet intervals in Boring WCC-26, drilled to 300 feet near the Naval Oceanography Station at Centerville Beach, west of Ferndale.
Late Quaternary Geoloc,ic Studies and Fault Capability Evaluation During this reporting period, data from the McKinleyville and College of Redwoods exploration localities were synthesized.
Laboratory analyses (percent clay content in samples collected from test pits and trenches) were run to assess the relative degree of pedogenic soil formation on the McKinleyville terrace.
Twenty-two shallow borings were drilled across the Goose Lake f ault near Hydesville to assess the amount of deformation in the late Pleistocene and Holocene sediments at this locality.
Two shallow borings were drilled adjacent to the McKinleyville fault (Mad River fault zone) to assess the cumulative displacement in the Cranell deposits (Pleistoce ne).
Approximately 160 meters of trench were excavated at the Brazil Property exploration locality 3 km south of the plant site.
These trenches are located on a terrace surface on the southwest side of Humboldt Hill.
Two trenches were excavated partway across the northeast-tending lineaments on Table Bluff and a trench extending from the plant to the tip of Buhne Point was started during the period.
Identification of Faults in the Site Locality Drilling operations continued in the site vicinity during the reporting period.
Boring WCC-6 (previously designated Boring 14 in the Scope of Work) was drilled to its revised ' target depth of 1068 feet at its revised location about 800 feet northeast of Boring B-26.
Boring WCC-5 (previously designated Boring 10) was drilled to its revised target depth of 3013 feet.
Boring WCC-10 (not previously designated in the Scope of Work) was drilled to its target depth of 2612 feet immediately south of the southwest corner of the plant bounglary.
Boring WCC-25 (not previously designated),
used as a ' calibration boring to evaluate the
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usefulness of a borehole seisviewer (sonic camera), was drilled to its target depth of ~ 120 feet in the Fields Landing sand quarry.
Suites of geophysical logs have been obtained in the borings:
spontaneous potential, resistivity, and gamma ray logs have been cbtained in all borings, and sonic, neutron, formation density, and high resolution dipmeter logs have also been obtained in Borings WCC-5 and WCC-10.
Additionally, a spectralog survey was
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conducted in Boring WCC-10, and seisviewer surveys were performed in Borings WCC-10 and WCC-25.
In addition, Pitcher and core barrel samples for paleomagnetic age dating were obtained at 20
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Frank Bradv May 14, 1980 Page 3 to 30 feet intervals from about 900 to 1550 feet depths in Boring WCC-10.
Seismic Wave Velocity and Standard Penetration Tests A five-boring test array was being installed about 150 to 200 feet northeast of the center of the reactor.
Three of the borings have been drilled to 250 feet depth, geophysically
- logged, cased, and grouted.
Inclinometer surveys have been performed to assess the degree of verticallity and straightness of these borings.
Drilling of the fourth boring has begun; standard penetration test (SPT) drive samples were obtained at 5 feet vertical intervals.
Compressional and shear-wave velocities were measured, using the cross-hole technique.
Formation and Propagation of Faults the/pature, amount and range of A
review was begun of displacements on different types of faults for selected historical earthquakes.
A compilation of data on the amount, recency and frequency of displasements from Quaternary geologic studies in the site region was started.
Geophysical Data Analysis In March and April the geophysical studies continued toward completion of data reduction and analysis.
The of fshore Western.
data have been summarized and the seismic line near the plant was interpreted.
Seismic Data Analysis Developnent of a seismological crustal structure and tectonic model for the plant site region has continued.
A refined analysis of refraction data has revealed further lateral variations in crustal structure.
These variations are being incorporated with previous results to refine the crustal structure model.
Ebcal mechanism solutions, hypocenter cross-
- sections, and recurrence ** rates are being used to evaluate faulting along structures significant to a
tectonic model interpretation.
Site Specific Earthquake Characteristics Resul ts of corrected digital records for selected earthquakes which occurred prior to October 1979 are continuing to be reviewed in light of recently obtained calibration data from the instrument supplier.
These calibration data are being used in
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re-evaluating results of preliminary analyses of more recent data, for the time period from October 1979 through January 1980.
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Frank Brady May 14, 1980 Page 4 Earthquake Ground Motion Ground motion data recorded during the October 1979 Imperial Valley earthquake was obtained.
Processing and analyses of these data have commenced with emphasis on recorded peak accelerations and computed spectral ordinates.
These data and other data will be used in the assessment of design ground motions for the plant.
Work in the assessment of soil-structure interaction has started.
Ground motion data potentially recorded by the free-field accelerometers and by instruments at the foundation of the plant will be used in assessing the soil-structure interaction effect under earthquake loading.
Schedule Age dating of the Hookton formation is scheduled to begin during the next reporting period.
Identification of faults south of Fields Landing by deep drilling will commence in the next period.
If you have any questions or require further information, please do not hesitate to call me.
With regards, Lt m /??1.
hok S.
Patwardhan ASP:dm e4 Abe
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