ML16342B264
| ML16342B264 | |
| Person / Time | |
|---|---|
| Site: | Diablo Canyon  |
| Issue date: | 01/27/1987 |
| From: | Schierling H Office of Nuclear Reactor Regulation |
| To: | Shiffer J PACIFIC GAS & ELECTRIC CO. |
| References | |
| NUDOCS 8702040198 | |
| Download: ML16342B264 (20) | |
Text
JanuaRD7, 1987 Docket Nos.
50-275 50-323 Mr. J.
D. Shiffer, Vice President Nuclear Power Generation Paci fic Gas and Electri c Company 77 Beale Street, Room 1451 San Francisco, California 94106 DISTRIBUTION RRD PDR Local-PDR PD¹3 Rdg.
T. Novak OGC E. Jordan B.
Gr imes J. Partlow N. Thompson H. Schierling C.
Vogan ACRS (10)
S. Savio E. Igne M. Libarkin G. guittschreiber G. Giesekoch D. Jeng L. Reiter N. Chockshi R. McMullen I. Alterman
Dear Mr. Shiffer:
SUBJECT:
ACRS CONSULTANTS COMMENTS ON LTSP Enclosed for your information are comments by John Maxwell, Ben Page, and George Thompson on the Pacific Gas and Electric Company's Long Term Seismic Program (LTSP).
The comments are based on the PGRE presentation at the ACRS meeting on November 20, 1986.
Sincer ely,
Enclosures:
As stated cc:
See next page-Hans Schierling, Project Manager Project Directorate ¹3 Division of PWR Licensing-A D¹3 C
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Mr. J.
D. Shiffer Pacific Gas and Electric Company V
Diablo Canyon CC:
Philip A. Crane, Jr.,
Esq.
Pacific Gas
& Electric Company Post Office Box 7442 San Francisco, California 94120 Mr. Malcolm H. Furbush Vice President General Counsel Pacific Gas
& Electric Company Post Office Box 7442 San Francisco, California 94120 Janice E. Kerr, Esq.
Cali fornia Public Utilities Commission 350 McAl lister Street San Francisco, California 94102 Mr. Frederi ck Ei ss1 er, Pres ident Scenic Shoreline Preservation Conference, Inc.
4623 More Mesa Drive Santa Barbara, California 93105 Ms. Elizabeth Apfelherg 1415 Cozadero San Luis Obispo, California 93401 Ms. Sandra A. Silver 660 Granite Creek Road Santa
- Cruz, California 95065 Harry M. Willis, Esq.
Seymour
& Willis 601 California Street, Suite 2100 San Francisco, California 94108 Mr. Richard Hubbard MHB Technical Associates Suite K
1725'amilton Avenue San Jose, California 95125 Arthur C. Gehr, Esq.
Snell
& Wilmer 3100 Valley Center Phoenix, Arizona 85073 NRC Resident Inspector Diablo Canyon Nuclear Power Plant c/o U.S. Nuclear Regulatory Commission P. 0.
Box 369 Avila Beach, California 93424 Ms.
Raye Fleming 1920 Mattie Road Shell Beach, California 93440 Joel
- Reynolds, Esq.
John R. Phillips, Esq.
Center for Law in the Public Interest 10951 West Pico Boulevard Third Floor Los Angeles, California 90064 Mr. Dick Blankenburg Editor & Co-Publisher South County Publishing Company P. 0.
Box 460 Arroyo Grande, California 93420 Bruce Norton, Esq.
c/o Philip A. Crane, Esq.
Pacific Gas and Electric Company Post Office Box 7442 San Francisco, California 94120 Mr. W. C. Gangloff Westinghouse Electric Corporation P. 0.
Box 355 Pittsburgh, Pennsylvania 15230 David F. Fleischaker, Esq.
P. 0.
Box 1178 Oklahoma City, Oklahoma 73101 Managing Editor San Luis Obispo County Telegram Tribune 1321 Johnson Avenue P. 0.
Box 112 San Luis Obispo, California 93406
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Pacific Gas 8 Electric Company Diabl o Canyon CC:
Dr.
R.
B. Ferguson Siera Club - Santa Lucia Chapter Rocky Canyon Star Route Creston, California 93432 Mr. Leland M. Gustafson, Manager Federal Relations Pacific Gas 5 Electric Company 1726 M Street, N.W.
Suite 1100 Washington, DC 20036-4502 Regional Administrator, Region V
U.S. Nuclear Regulatory Commission 1450 Maria Lane Suite 210 Walnut Creek, California 94596 Michael J. Strumwasser, Esq.
Special Counsel to the Attorney General State of California 3580 Wilshire Boulevard, Suite 800 Los Angeles, California 90010 Mr. Tom Harris Sacramento Bee 21st and 0 Streets Sacramento, California 95814 Ms. Jacquelyn Wheeler 2455 Leona Street San Luis Obispo, California 93400 Lewis Shollenberger, Esq.
US Nuclear Regulatory Commission Region V
1450 Maria Lane Suite 210 Walnut Creek, California 94596 Dian M. Grueneich, Esq.
Edwin F. Lowry, Esq.
Grueneich 5 Lowry 345 Franklin Street San Francisco, California 94102 Mr. Thomas Devine Government Accountability project Institute for Policy Studies 1901 Que Street, NW Washington, DC 20009 Chairman San Luis Obispo County Board of Supervisors Room 220 County Courthouse Annex San Luis Obispo, California 93401 Director Energy 'Facilities Siting Division Energy Resources Conservation and Development Commission 1516 9th Street Sacramento, California 95814 President California Public Utilities Commission California State Building 350 McAllister Street San Francisco, California 94102 Mr. Joseph
- 0. Ward, Chief Radiological Health Branch State Department of Health Services 714 P Street, Office Building ¹8 Sacramento, California 95814 Ms. Nancy Culver 192 Luneta Street San Luis Obispo, California 93401 Ms. Laurie McDermott, Coordinator Consumers Organized for Defense of Environmental Safety 731 Pacific Street, Suite 42 San Luis Obispo, California 93401
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Pacific Gas and Electric Company Diablo Canyon CC:
Dr. S. T. Algermissen U.S. Geological Survey P. 0.
Box 25046 Mail Stop 966 Denver Federal Center
- Denver, Colorado 80225 Dr. Keiiti Aki Department of Geological Sciences University of Southern California Los Angeles, California 90089 Dr. C. J. Costantino 4 Rockingham Road Spring Valley, New York 10977 Dr. James Davis State Geologist California Divison of Mines and Geology Room 1351 1416 Ninth Street Sacramento, California 95814 Dr. Ralph J. Archuleta Department of Geological Sciences University of California Santa Barbara Santa Barbara, California 93106 Dr. Steven M. Day S-Cubed P. 0.
Box 1620 La Jolla, California 92038 Mr. Don Bernreuter Lawrence Livermore Laboratory P. 0.
Box 808 Livermore, California 94550 Dr. George Gazetas JEC 4049 Renssalear Polytechnic Institute
- Troy, New York 12180-3590 Mr. Donald A. Brand Vice President, Engineering Pacific Gas and Electric Company 77 Beale Street, Room 2645 San Francisco, California 94106 Dr. David Perkins U.
S. Geological Survey P. 0.
Box 25046 Mail Stop 966 Denver Federal Center
- Denver, Colorado 80225 Dr. Robert D. Brown, Jr.
U.S. Geological Service Building 8, ¹977 345 Middlefield Road Menlo Park, California 94025 Dr. Morris Reich Structural Analysis Division Building 129 Brookhaven National Laboratory
- Upton, New York 11973 Mr. Loyd S. Cluff Pacific Gas and Electric Company 77 Beal e Street, Room 2661 San Francisco, California 94106 Dr.
Ken Campbell U.S. Geological Survey P.O.
Box 25046, Mail Stop 966 Denver Federal Cente~
Denver, Colorado 80225 Dr. Jean Savy Mail Stop L-196 Lawrence Livermore Laboratory P. 0.
Box 808 Livermore, California 94550
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Pacific Gas and Electric Company Diablo Canyon CC:
Dr. David B.
Slemmons 2995 Golden Valley Road
- Reno, Nevada 89506 Dr. Andrew S. Veletsos 5211 Paisley Avenue
- Houston, Texas 77096 Dr. Robert Youngblood Building 130 Brookhaven National Laboratory
- Upton, New York 11973
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dDHk C. MAXWELL DEDLDDIST S222 WCSTCRN HILLS DRIVE AVSTIHiTCXAS 7S72I
~I'k ~ 4li ICOSI November 25, 1986 To:
Dr. C. P. Siess, via Dr. R. Savio Prom:
J.
C. Maxwell
Subject:
November 20, 1986 meeting ACRS E.Z.P.
Subcom-mittee, Diablo Canyon Long Term Seismic Program 1 ~ LTSP The Long Term Seismic Program initially seemed too ambitious and broadly focused to be satisfactorily accom-plished in the allowed three yearD.
However, the pre-sentation during the November 80th meeting of the E.E.P.
subcommittee inspires confidence that at least most of the program will be sati.sfactorily completed.
The final report will substantially improve our knowledge and under-standing of the regional tectonics, fault histories, and potential seismic activity within this geologically com-plex region.
Qf particular importance are the studies near the possible junction of the San Simeon and Hosgri faults which indicate a slip rate on the Hosgri fault of approximately 1/10th that on the San kndreas f'ault, thus establishing important controls of the rate of strain buildup and release along the Hosgri fault.
The extensive restudy of'he 19a7 Lompoc earthquake is also of great importance, as is the determination that an earthquake exceeding the plant seismic design should originate only on major faults as close as, or closer than the Rinconada fault.
- 2. Attenuation of Seismic Energy Calculation of potential seismic damage at the Diable Canyon plant site, and in most of California, must take into account the characteristically high attenuation rate.
Large attenuations are to be expected, particularly where Franciscan melange forms the acoustic
- basement, as in the plant site area and indeed under most parts of the Coast Ranges.
a) Melange characteristics:
Vhere well exposed, this melange resembles a giganti.c mud slide. It consists of blocks to large masses of rocks oi'ighly variable
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Dr. C. P. Siess via Dr. R. Savio November 25, 1986 elastic properties, enclosed in an intensely sheared shaly matrix.
Such a mixture effectively disperses and absorbs seismic energy.
b) Distant earthquake:
The Diablo Canyon plant site is within a wide belt underlain by melange extending approximately from the Nacimiento fault on the northeast,
- seaward, probably to the vicinity of the Santa Lucia bank (Page, et al, GSk Map and Chart Series, NC-28G, 1979) ~
Energy from distant earthquakes is much attenuated at the plant site, as indicated by the work described at the November 20th meeting.
c) Faults in Melange:
At the latitude of the plant site the Hosgri and all faults west of the Rinconada fault and east of the Santa Lucia Bank are developed within melange forming the acoustic basement beneath;.
Tertiary sedimentary rocks.
The nature and depth of underlying crustal rocks is not known.
Reeonstructions suggest that melange extends to depths exceeding the limiting depth of earthquakes in this area.
The character-istics of melange which cause large attenuation also facili-tate creep and thus inhibit buildup of large elastic strain.
This characteristic of melange was noted by Prescott and Yu (Jour.
Geophy. Res., v. 91, no. B7, p. 7475-7484, 1986)~
and is also supported by the noteable absence of earth-quakes exceeding magnitude 6 along faults within melange.
d) 1927 Lompoc Earthquake:
Determination of the location of the magnitude 7.5 Lompoc earthquake is of great importance for estimating potential seismic intensity at the plant site.
Large differences among hypocenters pro-posed by competent 'seismoXogists indicate that a unique solution will not be found.
The restudy by the LTSP group has established that the earthquake resulted from an up-thrust, probably along a plane dipping 66o BE at 10 km.
depth.
The magnitude of the earthquake indicates fault-ing in much more rigid basement rocks than melange would provide.
This factor, plus the orientation and dominant-ly upthrust character of the causal fault strongly indicate a location well to the south of the plant site, within
,the structural domain of the Transverse Ranges where rigid basement rocks may be present at relatively shallow depth.
John C. Naxwell
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STANFORD UNIVERSITY STANFORD, CALIFORNIA DEPAkTMENT OF GEOLOGY School ot Ernh Scicoccc Dr. Chester P. Siess
$110 Civil Engine'ering Bldg.
University of Illinois
- Urbana, ZL 61801 November 28, 1986
~ear Chester:
The following remarks refer to the meeting of November 20, 1986, held in Mashington D.C., regarding seismic studies in the area around the Diablo Canyon Nuclear Plant, The Lon'g Term Seismic Program of PG & E still seems well conceived and well planned, especially with the refinements of Phase ZZI. One might wonder if the program is overly elaborate,
- diffuse, and lacking in focus, but I do not think so. Nost of the studies are certainly germane to the problem of seismic risk at the Diablo Canyon site, hnd the principal individuals carrying out the plan seem to be outstanding in ability and experience.
The main-geologic endeavor is, as it has been, the determination of the character,
- size, and behavior of the faults in the area, especially the Hosgri fault and any affiliated companion structures.
The discovery by Crouch that the Hosgri fault may be a thrust was important, but we hav'e not heard the last word on the subject.
Geologists in the Lon~ Term Seismic Program have confirmed the existence of Quaternary strike-slip faulting near San Simeon in a zone that we have long considered a probable continuation of the Hosgri system.
To the north, accrued strike-slip on the presumed extension of the zone amounts to at least 70 and possibly as much as 150 km of displacement, - an amount that could not die out altogether before reaching the latitude of the Diablo area.
Where is the locus of this displacement in the region of interest2 Elsewhere in California there are well-known active strike-slip faults which are flanked on one or both sides by thrusts or high-angle reverse faults:
Examples in the vicinity of San Francisco Bay include parts of the San
- Andreas, Hayward, and Calaveras fault zones.
The reasons for this spatial relationship are not obvious, but there is little doubt about
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$/r+ ++g//f the existence of thrust/strike-slip pairs.
They are commonly reported in petroleum geology literature.
Thus the PG & E team must examine their seismic reflection profiles with this possibility in mind Ve have already discussed
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this with several members of the PG h E geology group. Of course, it may turn out that the above.model does not apply, but ifit gains support it will reconcile seemingly conflicting evidence.
On the whole, the program appears to be capable of resolving possibilities like the foregoing. I expect it to yield more information in a few years than all the new information acquired in the preceding decade.
With best regards and all good wishes, Ben)amin M. Page cc Richard Savio
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George h. Thompson 421 hdobe Place Pdo hlto, California 94306 November 30, 1986 I
To:
ACRS Subcommittee on Extreme External Phenomena, via Richard Savio From:
George A Thompson
Subject:
Report on November 20, 1986 Subcommittee meeting on the Diablo Canyon Long Term Seismic Program This report attempts to highlight a few important topics re-lated to the meeting.
In general, the program is energetically engaged in fact-finding and, as yet, is less focussed on alter-native tectonic models.
Increasing emphasis on models/hypotheses and the priorities for testing them will be useful from here on out, because the general scientific problems are open-ended.
The Hosgri Fault 2'one is deservedly receiving greatest emphasis.
By Hosgri Zone I refer to the broad band of active and inactive fault strands that may have both strike-slip and reverse movement.
The fault zone extends northward into the San Simeon fault and poss-ibly also includes strands seaward of San Simeon Point, Alternative working hypotheses about the fault zone need to be defined as clearly as possible:
(1) It is a complex, primarily strike-slip zone, as the present evidence at San Simeon clearly suggests2 (2) If sof are the thrust faults, seen in seismic reXlection sections, splays from the strike-slip faults, as is the case at some places along the San Andreas Fault'? (3) Are the thrust faults independent late structures that cut or goin the strike-slip faults?
An intensification of com-pression and thrusting in the last 3-5 million years is in accord with a change in Pacific plate motion evidenced by hotspot tracks and by the geology of the Coast
- Ranges, (4)
Do the thrust faults have a significant earthquake potential in crystalline bedrock beneath the plant2 The emerging an83.ysis of earthquake records is'aking a lot of sense and should help to narrow the possibilities for future earth>>
quakes.
A second focus of concern is the San Kiguelito and other on-land faults that are more or less on trend with it, This problem is being addressed effectively by a variety of studies, but getting definitive answers may be difficult or impossible, I would like to see an analysis of the possible hazard based upon alternative assumptions about. these faults, within the bounds of obtainable
- evidence, continue to believe that the studies are necessary and rele-vant.
They are being managed and conducted in an excellent manner, Sincerely,
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