ML19257D239
| ML19257D239 | |
| Person / Time | |
|---|---|
| Site: | Humboldt Bay |
| Issue date: | 01/21/1980 |
| From: | Locke R PACIFIC GAS & ELECTRIC CO. |
| To: | Lazo R Atomic Safety and Licensing Board Panel |
| References | |
| NUDOCS 8002010563 | |
| Download: ML19257D239 (6) | |
Text
.
P.A.C I F I C G-A S AND E LE C T RIC C O M PANY bbWb 77 BEALE STREET,31ST FLOOR. SAN FR ANCISCO, C ALIFO R NI A 94106 (415) 781 4211 JOH N C. MOR R1S S E Y e.._..
,a e.....,
v.cc r.:sier.r.. er rut cou iro g.,.,.,,...g.,,
p.,.,.. y;.;g.,,,,,,
r.~l.*-\\ ' :*. ~
UC" U 'Ya. s=-
uaLcoLuN.PumeuaH 376,:..,:,:15.;:.....,,,, j., !65.:.1.
..-..........,c.....<
C M A.L E s T. V AN D E U S E N
- v;:. := : ~~
e= :== -
.-.u...eE.s..
January 21, 1980
- n *=:"'
~ = ' * * = ~ -
H E N.Y J. La L A N T E
=r. :::: --
- .= : :: =
ao
~......on
=:: :......
=
n--
-u. m -,u
.~...
=:::=.:
= = = = - -
,,,e-P.a a*. W e ' *
- UY'
- T*I c na t E s w. Y siea E t o
- .v= -
- e..== -
- =: :="~~
- = =."= ~"
........ v = =...
=. = - -
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 November-December 1979.
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 Bay 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, fu MALCOLM H.
FURBUSH
//
PHILIP A.
- CRANE,
$- lb RICHARD F.
LOCKE 05 h
&e e* a' c
=
p By
] A1)
RICHARD F.
LOCKE g
N N
RFL: sis cc:
Bruce Norton, Esq.
}hb Enclosure N
8002010
$t
UNITED STATES OF AMERICA NUCLEAR REGULATORY COMMISSION In the Matter of
)
)
PACIFIC GAS AND ELECTRIC COMPANY
)
Docket No. 50-133
)
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 mail, properly stamped and addressed:
Linda J.
Brown, Esq.
- Robert M.
Lazo, Esq., Chairman 100 Van Ness Avenue, 19th Floor Atomic Safety and Licensing San Francisco, CA 94102 Board Panel 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:
January 21, 1980
[t)b
/'
RICHARD F.
LOCKE
/'
Attorney Pacific Gas and Electric Company
- Express Mail 1857 193
E'n**2T'*c'2f*"%% '
Woodward Clyde Consultants 415-956-7070 13976E-5215.1,5216.2 126 January 14, 1980 M r.
Frank Brady Pacific Gas and Electric Company 77 Beale Street, Room 2611 San Francisco, California 94106
Dear Frank:
Subject:
Progress During November and December, 1979 -
Geologic and Seismologic Studies, Humboldt Bay Review This report summarizes the geologic and seismologic investigations for the Humboldt Bay Power Plant during November and December, 1979.
During the period, regional mapping and age dating, late Quaternary studies and acquistion and analysis of strong motion data continued.
Also during this period, on site studies consisting of deep borings and seismic reflection surveys were underway.
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 3)
Fault Capability Evaluation 4)
Identification of Faults in the Site Locality 5)
Geophysical and Geodetic Data Acquisition and Analysis 6)
Site Specific Earthquake Characteristics 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.
R gional Geologic Mapping and Age Dating Major emphasis was placed on laboratory and office studies during this period, while effort on field st.udies was reduced.
Office studies included, detailed analysis of existing data and the preparation of interim summaries.
Laboratory studies included radioisotope age dating of volcanic ash
- deposits, chemical studies of volcanic ash deposits for correlation purposes, and to a lesser degree, the measurement of paleomagnetic polarity of sediment samples.
Analysis of petroleum well logs continued for selected parts of the Humboldt Bay Area.
1857 194 Consultrng Engineers. G 'nsts and EnvironmentalScienosts g
D Off ces in Other Poncipal Cities
./
Mr. Frank Brady Woodward Clyde Consultants January 14, 1980 Page 2 Late Quaternary.itudies Photointerpretation and a ground reconnaissance were completed in the vicinity of Hydesville, and a map was compiled of the tectonic terraces along Yager Creek and of the lineaments associated with these terraces.
The topographic expression of-some of the mapped lineaments is similar to that of the Goose Lake fault, and they are inferred to be faults that displace late Quaternary deposits.
More detailed studies, including soil test pits on the terraces and profiling of the terraces, are required '
to complete the investigations in the Hydesville area.
- However, these studies will be postponed until future phases of the project to enable the completion of preliminary studies at the McKinleyville and College of the Redwoods exploration localities.
Photointerpretation to identify lineaments in the vicinity of the Little Salmon fault between Carlotta and the plant site was begun using low-sun-angle color-infrared aerial photographs (scale 1:12,000) that were taken for this project.
Black and white imagery taken in 1939 (scale 1:10,000), 1940 (1:30,000), and 1974 (1:12,000) and U-2 color-infrared imagery (approximately 1:50,000) are being used to supplement the data from the low-sun-angle color-inf rared imagery, particularly in the vicinity of the plant site.
Fault Capability Evaluation Logging of two trenches across the Trinidad fault (Anderson Ranch lineament) was completed.
Reverse faults displacing marine terrace deposits were observed in both these trenches.
- Data, including some C-14 dates, from the trenches across the Goose Lake and Trinidad faults are being evaluated to assess the relative degree of activity on these features and to assess the relationship of these features to the regional tectonic environment.
Identification of Faults in the Site Locality Drilling operations with two drilling rigs continued in th'e site vicinity during the reporting period.
.The larger rig has completed Boring WCC-3 (not previously designated in the Scope of W ork ), located immediately west of U.S. Route 101 about 1/4 mile south of Borin$ WCC-2 (previously designated ~ Boring 11 in the Scope of Work), to its revised target depth of 3400 feet.
This rig has also drilled Boring WCC-12 (previcasly designated Boring
- 9) to 2300 feet.
The smaller rig has completed Boring WCC-14A (previously designated Boring 2) and Boring WCC-13 (previously 1857 195
M r.
Trank Brady Woodward Clyde Consultants January 14, 1980 Page 3 designated Boring 4 ),
both in the Fields Landing area, to depths of 670 feet and 610 feet, respectively.
Suites of geophysical logs have beea obtained in the borings.
Spontaneous potent'al, resistivity, gamma ray, and caliper logs have been obtain d in all
- borings, and sonic,
- neutron, formation density, fracture identification, and high resolution dipmeter logs have also been-typically obtained in the deeper borings.
Geophysical and Geodetic Data Acquisition and Analysis High resolution seismic reflection surveys totalling 3550 linear ~
feet were conducted during the reporting period.
Three seismic lines of 950, 750, and 1150 linear feet were shot north and west of the Fields Landing area.
A 600 feet long line was shot immediately south of the plant. A 100 feet line was shot on the beach west of the plant to investigate reflection quality from that area using a
different recording technique.
Initial computer processing of these data has been completed and preliminary analysis begun.
About 250 miles of Western Geophysical's offshore seismic reflection survey lines have been purchased and preliminary interpretation and analysis begun.
The geodet:c level line from Orick to Garberville is the only line in the site locality which hau repeated first order level data.
A preliminary analysis was in progress to assess the relative rate of elevation change basec on the surveys which were conducted in 1931 and in 1967.
Site Specific Earthquake Characteristics Collection and analysis of strong motion data continued from the eight station strong motion network of digital acceleration recorders.
Measures have been taken regarding field procedures and instrument reliability to improve the recording capabilities of the network as configured.
The reduction of data continued with modified software to accomodate digital data from recorders in fixed gain or auto-gain.
Results of more extensive analysis are being verified for several of the corrected digital records.
SCHEDULE Certain tasks in [he Scope of Work were scheduled to begin during the period but/ were not activated.
As stated ~in the previously submitted progress report, age dating of the Hookton formation will be postponed pending evaluation of other regional geologic data.
Similarly, the identification of faulto south of Fields-Landing by drilling new borings in the vicinity of ~ existing borings A-10 and P-16 has been posponed pending the evaluation of
,1857 196
Mr. Frank Brady Woodward Clyde Consultants January 14, 1980 Page 4 the high resolution seismic reflection survey data.
More extensive work on ansessing fault formation and propagation has been postponed until early 1980 e.s has the installation of free-field strong motion accelerometers at the site.
If you have any questions or require further information, please do not hesitate to call me.
With regards,
% 011, e ferson M.
Hilliard
,/
\\857
\\97 i