ML19254E625
| ML19254E625 | |
| Person / Time | |
|---|---|
| Site: | Humboldt Bay |
| Issue date: | 09/17/1979 |
| From: | Locke R PACIFIC GAS & ELECTRIC CO. |
| To: | Luton E Atomic Safety and Licensing Board Panel |
| References | |
| NUDOCS 7911010587 | |
| Download: ML19254E625 (5) | |
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Edward Luton, 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) Dockec No. 50-133, License No.
Dear Mr. Luton:
In accordance with the Board's Order of June 19, 1979, Pacific Gas and Electric Company hereby submits a Report by its consultants, Woodward-Clyde Consultants on the status of the geologic and seismic investigations involving Humboldt Bay Power Plant, Unit No. 3 for the 60-day period of July-August 1979.
Very truly yours, JOHN C. MORRISSEY MALCOLM H.
FURBUSH PHILIP A.
CRANE RICHARD F.
LOCKE
/
By:
RICHARD F.
LOCKE RFL: sis
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Enclosure cc:
Mr. Douglas Hamilton - w/ enc.
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Bruce Norton, Esq.
- w/ enc.
7 911010 N 7
En"?J 0 0 % 2" M in " "
Vloedward Clyde Consultants 415 4 6-7070 13976D-5216.1 1397 6C-8116.1,106 4 083 September 6,1979 Mr. Frank Brady Pacific Gas and' Electric Co.
77 Beale Street, Room 2611 San Francisco, CA 94106
Dear Frank:
Subject:
Progress During July and August 1979; Geologic and Seismologic Studies; Humboldt Bay Review This report summarizes the investigations for the Humboldt Bay Power Plant during July and August 1979.
During the period under review, work was contir.ued on field and office studies aimed at obtaining additional information on the geologic structure at the site, its relationship to regional tectonics and a continuation of aquisition and analysis of strong motion data.
Specific tasks included the following:
1.
Ongoing mapping and age dating of the Little Salmon fault.
2.
Quaternary geologic studies in the region.
3.
Ongoing analysis of subsurft.ra data in the vicinity of the site.
4.
Ongoing collection and analysis of strong motion data.
5.
Developement of a scope of work for continued activities.
The progress made on each of these tasks is summarized below:
Geologic Mapping and Age Dating Studies of the Little Salmon Fa ul t During the period under review, the geologic mapping and age dating studies were directed towards improving correlations and dates within the Wildcat Group and towards establishing a model for the development of the regional geologic structure.
The purpose of this ef fort was to provide a more thorough understanding of the history of the movement of the Little Salmon f ault.
Consulting Eng.ncers. Geologists and F.nvronmental Sc entists M
7
-) b U 5l1l Offcccin Other Pnnc: pal C.t es
Woodward Clyde consultants Specific tasks accomplished during the period consisted of the following:
1.
Mapping and ash collection continued in the area south of the site. Gas well data was obtained, evaluated, and merged with the information developed during tt.a earlier surface geologic investigations.
This has resulted in a better understanding of the development of regional structure in relation to the movement on the Medicino Triple Junction.
2.
Eleven mineral seperations for additional Potassium -
Argon dates and fif teeen trace element analyses were completed. Additional seperation of zircons to be used in fission and track age dating analyses neared completion.
Quaternary Geologic Studies A summary was compeleted which describes the procedures and results of analysis of the relative degree of heavy mineral etching in the soils developed on the terrace sequence at Trinidad Hea d.
The available field and laboratory data suggest that one of the two lowest marine terraces at Trinidad may show some displacement.
The displacement observed in the natural exposures along the scarp between the two surf aces may be either of tectonic origin or the result of other causes such as landslides.
Additional investigations will be necessary to evaluate the nature of displacement.
Aerial photographs taken along the scarp between the two marine terraces at Ttinadad and along the Little Salmon fault were examined for evidence of recent f aulting and to locate potential sites for trenching.
Several sites were identified and some were examined on the ground.
Potential sites for trenches along the Little Salmon fault and across other faults and lineaments were evaluated to establish priorities for future investigations.
Analysis of Subsurf ace Data in the Vicinity of the Site Work continued on the data summary of available boring and geophysical data in the vicinity of the site. Interpreted data was integrated with the previous interpretations to obtain an improved representation of geologic structure at the site.
Collection and Analysis of Strong Motion Data The operation of the 8-station network of strong motion digital acceleration recorders continued through the period.
Three of the stations were relocated closer to the plant site at the end of the period The new locations will provide a closer spacing while maintaining good azimuthal coverage of earthquake sources in the site vicinity.
I284 337
~
Woodward.Clyde Consultants Reduction of data from previous recordings was continued.
The process is nearly current and preliminary analysis has been performed on all records.
Selected records have been digitally corrected for more extensive analysis.
Scope of work for the continuation of geologic and seismologic s tud ies A scope of work was prepared for the geologic, seismologic and engineering studies for the next phase, scheduled to start in September, 1979. The purpose of these studies is to continue studies related to the resolution of the issues identified by the NRC staff related to surface faulting and ground motions pertaining to the assessment of the geologic suitability of the Humboldt Bay Nuclear Power Plant Site. The studies will consist of field investigations, laboratory investigations and office evaluations of geologic, seismologic, geophysical and geotechnical engineering information. During the studies, information will be developed on the regional tectonics and geologic conditions at the site.
The new information will be integrated with the previously developed information and reevaluated.
The objectives, scope and methodology of proposed investigations is described in detail in a seperate document.
If you have any questions or require any further information, please let me know.
With regards,._.
j
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a Ashok S.
Patwardhan
'N l2h4] ASP /cf
J 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.
- Edward Luton, Esq., Chairman 100 Van dess Avenue Atomic Safety and Licensing Board 19th Floor Panel San Francisco, California 94102 U.S. Nuclear Regulatory Commission Washington, D.C.
20555
- Barry Smith, Esq.
Office of Executive Legal Mr. Gustave A. Linenberger, Member Director Atomic Safety and Licensing Board BETH 042 Panel U.S. Nuclear Regulatory U.S. Nuclear Regulatory Commission Commission Washington, D.C. 20555 Washington, D.C. 20555 Dr. David R. Schink
- Secretary Department of Oceanography U.S. Nuclear Regulatory Texas A & M University Commission College Station, Texas 77840 Washington, D.C.
20555 Attn: Docketing and Service Michael R. Sherwood, Esq. Section Sierra Club Legal Defense Fund, Inc. 311 California Street, Suite 311 San Francisco, California 94104 Dated: September 17, 1979 /d / 3 ) i/' k - 'Y RICHARD F. LOCKE Attorney Pacific Gas and Electric Company
- Express Mail I284 339
PACIFIC GAS AN'D ELECTR,IC C O M PANY = O 'M.m 77 SEALE STREFT,3137 FLOCR. $AN 'R ANCISCO, C ALIFOR NI A 94106 (415) 781 4211 JoMN c. Moeae ss ay vu:s e.asioner..e as.a. 6 cou.s s .:07.".'*l. J- . f.*"/1*T.! :""
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,,,,,,.a..' . -...~.. -::--t....::.:.:. Edward Luton, Esq., Chairman Atcmic Safety and Licensing Board Panel U. S. Nuclear Regulatory Ccmmission Washington, D.C. 20555 Re: In the Matter of Pacific Gas and Electric Company (Humboldt Bay Power Plant, Unit No. 3) Docket No. 50-133, License No. DPR-7
Dear Mr. Luton:
In accordance with the Board's Order of June 19, 1979, Pacific Gas and Electric Company hereby submits a Report by its consultants, Woodward-Clyde Consultants on the status of the geologic and seismic investigations involving Hunboldt Bay Power Plant, Unit No. 3 for the 60-day pericd of July-August 1979. Very truly yours, JOHN C. MORRISSEY MALCOLM H. FURBUSH PHILIP A. CRANE RICHARD F. LOCKE lb v By: RICHARD F. LOCKE RFL: sis Enclosure 1284 340 cc: Mr. Douglas Hamilton - w/ enc. Bruce Norton, Esq. - w/ enc.
([gCdW37d.(lydg (QQ$yl ISM ($ Three Emnarcadero certer, Suite 700 San Frectsco. Cahfornia 94111 415 936-7070 13976D-5216.1 13 97 6C-8116.1,10 6 4 083 September 6,1979 Mr. Frank Brady Pacific Gas and Electric Co. 77 Beale Street, Room 2611 San Francisco, CA 94106
Dear Frank:
Subject:
Progress During July and August 1979; Geologic and Seismologic Studies; Hemboldt Bay Review This report summarizes the investigations for the Humboldt Bay Power Plant during July and August 1979. During the period under review, work was continued on field and office studies aimed at obtaining additional information on the geologic structure at the site, its relationship to regional tectonics and a continuation of aquisition and analysis of strong motion data. Specific tasks included the following: 1. Ongoing mapping and age dating of the Little Salmon fault. 2. Quaternary geologic studies in the region. 3. Ongoing analysis of subsurface data in the vicinity of the site. 4. Ongoing collection and analysis of strong motion data. 5. Developement of a scope of work for continued activities. The progress made on each of these tasks is summarized below: Geologic Mapping and Age Dating Studies of the Little Salmon Fa ul t During the period under review, the geologic mapping and age dating studies were directed towards improving correlations and dates within the Wildcat Group and towards establishing a model for the development of the regional geologic structure. The purpose of this effort was to provide a more thorough understanding of the history of the movement of the Little Salmon f aul t. l}}4 341 m c<;csuthea E encers Oeoogs:s ~~,ce-m,m I Othces in Ciner Enccal C.tes
Woodward.Clyde Consultants Specific tasks accomplished during the period consisted of the following: 1. Mapping and ash collection continued in the area south cf the site. Gas well data was obtained, evaluated, and merged with the information developed during the earlier surf ace geologic investigations. This has resulted in a better understanding of the development of regional structure in relation to the movement on the Medicino Triple Junction. 2. Eleven mineral seperations for additional Potassium - Argon dates and fifteeen trace element analyses were completed. Additional seperation of circons to be used in fission and track age dating analyses neared completion. Quaternary Geologic Studies A summary was compeleted which describes the procedures and results of analysis of the relative degree of heavy mineral etching in the soils developed on the terrace sequence at Trinidad Head. The available field and laboratory data suggest that one of the two lowest marine terraces at Trinidad may show some displacement. The displacement observed in the natural exposures along the scarp between the two surfaces may.be either of tectonic origin or the result of other causes such as landslides. Additional investigations will be necessary to evaluate the nature of displacement. Aerial photographs taken along the scarp between the two marine terraces at Trinadad and along the Little Salmon fault were examined for evidence of recent f aulting and to locate potential sites for trenching. Several sites were identified and some were examined on the ground. Potential sites for trenches along the Little Salmon f ault and across other f aults and lineaments were evaluated to establish priorities for future investigations. Analysis of Subsurf ace Data in the Vicinity of the Site Work continued on the data summary of available boring and geophysical data in the vicinity of the site. Interpreted data was integrated with the previous interpretations to obtain an improved representation of geologic structure at the site. Collection and Analysis of Strong Motion Data The operation of the B-station network of strong motion digital acceleration recorders continued through the period. Three of the stations were relocated closer to the plant site at the end of the period The new locations will provide a closer spacing while maintaining good azimuthal coverage of earthquake sources in the site vicinity. I284 342
Woodward Clyde Consultants b Reduction of data from previous recordings was continued. The process is nearly current and preliminary analysis has been performed on all records. Selected records have been digitally corrected for more extensive analysis. Scoce of work for the continuation of geologic and seismologic s tud ies A scope of work was prepared for the geologic, seismologic and engineering studies for the next phase, scheduled to start in Se ptember, 1979. The purpose of these studies is to continue studies related to the resolution of the issues identified by the NRC staf f related to surface f aulting and ground motions pertaining to the assessment of the geologic suitability of the Humboldt Bay Nuclear Power Plant Site. The studies will consist of field investigations, laboratory investigations and office evaluations of geologic, seismologic, g2cphysical and geotechnical engineering information. During the studies, information will be developed on the regional tectonics and geologic conditions at the site. The new information will be integrated with the previously developed information and reevaluated. The objectives, scope and methodology of proposed investigations is described in detail in a seperate document. If you have any questions or require any further information, please let me know. With regards, f. - L-_ '\\ ( ,r e. 'A~- A 1284 343 Ashok S. Patwardhan N ASP /cf
- e UNITED STATES OF AMERICA
~ NUCLEAR REGULATORY COMMISSION In the Matter of ) ) PACIFIC GAS AND ELECTRIC COMPANY ) Decket 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 Statec mail, properly stamped and addressed: Linda J. Brown, Esq.
- Edward Luton, EJq., Chairman 100 Van Ness Avenue Atomic Safety and Licensing Board 19th Floor P anel San Francisco, California 94102 U.S. Nuclear Regulatory Commission Washington, D.C.
20555
- Barry Smith, Esq.
Office of Executive Legal Mr. Gustave A. Linenberger, Member Director Atomic Safety and Licensing Board BETH 042 Panel U.S. Nuclear Regulatory U.S. Nuclear Regulatory Commission Ccemission Washington, D.C. 20555 Washington, D.C. 20555 Dr. David R. Schink
- Secretary Department of Oceanography U.S. Nuclear Regulatory Texas A & M University Commission College Station, Texas 77840 Washington, D.C.
20555 Attn: Docketing and Service Michael R. Sherwood, Esq. Section Sierra Club Legal Defense Fund, Inc. 311 California Street, Suite 311 San Francisco, California 94104 Dated: September 17, 1979 /d $f RICHARD ' F. LOCKE Attorney Pacific Gas and Electric Company
- Express Mail 128A 344}}