ML20212L268
| ML20212L268 | |
| Person / Time | |
|---|---|
| Site: | 05000000, Diablo Canyon |
| Issue date: | 01/12/1977 |
| From: | Allison D Office of Nuclear Reactor Regulation |
| To: | Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML20150F500 | List:
|
| References | |
| FOIA-86-391 NUDOCS 8608250268 | |
| Download: ML20212L268 (6) | |
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JAN 12 1977 DOCl;ET NOS.: 50-275 and 50-323 APPLICANT: PACIFIC GAS Afl0 ELECTRIC COMPANY (PGf.E)
FACILITY:
DIABLO CANYON NUCLEAR POWER STATI0?l, UNITS 1 AND 2 (DIABLO CANY0fi) 9 SufftARY OF MEETING llELD ON JAflUARY 5,1977, TO DISCUSS SEISMIC DESIGN REEVALUATION OF DIABLO CAflY0fl i!
We met with the applicant on January 5,1977, to discuss the seismic design reevaluation of Diablo Canyon. A list of attendees is provided
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in the Enclosure.
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On December 20, 1976, the Advisory Comittee on Reactor Safeguards (ACRS) 4 had forwarded coments by the ACRS consultants and others concerning the Diablo Canyon seismic design reevaluation. The ACRS had requested that PG&E and the NRC staff respond to these coments.
PG&E indicated its intention to respond as fully as possible to all of the concerns raised in the comments. PGAE had not yet developed specific information concerning the nature of its responses or the schedule for providing them. PG&E indicated that this specific infor-mation would be available in the near future.
We discussed a number of the coments and other items concerning the seismic design reevaluation. These discussions are sumarized below:
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We discussed Michael Bouchon's Ph.D. thesis where complex calcula-i tions had been perfonned to theoretically detennine the ground 1
motions resulting from the 1971 San Fernando earthquake.
It was noted that application of this technique to the Diablo Canyon i
situation might provide additional insight into the seismic design i
basis.
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2.
PG&E's consultant, Dr. John A. Blume, was perfonning a probability 8
j study with the advice of Dr. Allen Cornell of MIT.
It was our understanding that one of the ACRS consultants, Dr. M. Trifunac, e
i had recently completed a probability study. These studies dealt primarily with the probabilities of earthquakes of various severities occurring at the Diablo Canyon Plant.
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It was noted that many of the ACRS consultants had comented on
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I of damping that a structure or system would exhibit under seismic excitation. PG&E indicated that Dr. Blume would address the' ACRS consultants' comments concerning damping and encouraged the staff to do so also.
4.
Some of the ACRS consultants had recommended perfonning a detailed i
three-dimensional soil structure interaction analysis. We discussed several aspects of this reconsnendation including the feasibility and utility of such an approach.
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In the seismic reanalysis that was in progress, PG&E had been calcu-j lating the torsional effects on the plant structures taking account of the wave nature of seismic ground motions.
PG&E did not feel i
that the results obtained to date were realistic. We discussed the various complexities involved in these calculations. PG&E indicated that they would study the matter further and let us know what their
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results were.
In a recent meeting (January 28 and January 29, 1977), we had discussed the reanalysis efforts to date with PG&E. We briefly discussed some of the points that had been covered at that meeting. We indicated that we 6
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.were preparing guidelines for a detailed audit by the NRC staff of the-reevaluation efforts. The detailed audit would be conducted when the results of the reevaluation were available.
Original Signed By Dennis Pl Allison Dennis P. Allison Light Water Reactors Branch No.1 Division of Project Management
Enclosure:
List of Attendees I
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t Diablo Canyon anh 12 &?7-Pacific Gas and Electric Company ATTN: Mr. John C. Morrissey Vice President & General Counsel Ms. Raye Fleming 77 Beale Street 1746 Charro Street San Francisco, California 94106 San Luis Obispo, California 93401 Philip A. Crane, Jr., Esq.
Mr. John Forster Pacific Gas and Electric Company 985 Palm Street 77 Beale Street San Luis Obispo, California 93401 San Francisco, California 94106 Mr. William P. Cornwell Andrew J. Skaff, Esq.
P.O. Box 453 California Public Utilities Commission Morro Bay, California 93442 350 McAllister Street San Francisco, California 94102 Mr. W. J. Lindblad, Project Engineer Pacific Gas and Electric Company Mr. Frederick Eissler, President 77 Beale Street Scenic Shoreline Preservation San Francisco, California 94106 Conference Inc.
4623 More Mesa Drive Mrs. Thelma Hirdler Santa Barbara, California 93105 811 Fair Oaks Avenue Arroyo Grande, California 93420 Ms. Elizabeth E. Apfelberg 1415 Cazadero Mr. W. C. Gangloff San Luis Obispo, California 93401 Westinghouse Electric Corporation P.O. Box 355 km4WNd Ms. Sandra A. Silver Pittsburgh, Pennsylvania 15230 5055 Radford Avenue North Hollywood, California 91607 Thomas J. Hirons Los Alamos Scientific Lab.
Mr. Gordon A. Silver Group TD-6, MS 226 5055 Radford Avenue P.O. Box 1663 North Hollywood, California 91607- -
Los Alamos, New Mexico 87545
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Paul C. Valentine Mr. Paul Morton 400 Channing Avenue California Division of Mines Palto Alto, California 94301 and Teology 28 Civic Center Plaza Yale I. Jones, Esq.
Room 642 100 Van Ness Avenue Santa Ana, California 92701 19th Floor San Francisco, California 94102 Dr. N. M. Newmark Consulting Engineering Services James A. Geocaris 1211 Civil Engineering Building Center for Law in the Public University of Illinois Interest Urbana, Illinois 61801 10203 Santa Monica Boulevard Los Angeles;-California 90067
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d4A 12 E77 Diablo Canyon Dr. W. Hall Consulting Engineering Services 1211 Civil Engineering Building University of Illinois Urbana, Illinois 61801 Mr. James F. Devine Department of the Interior U.S. Geological Survey National Center, Mail Stop 908 South Lake Drive Reston, Virginia 22092 Mr. R. Morris U.S. Geological Survey Engineering Geology Branch Denver Federal Center Denver, Colorado 80225 Hs. P. Henshaw Department of the Interior U.S. Geological Survey National Center, Mail Stop 908 12201 Sunrise Valley Drive Reston, Virginia 22092 Ta..-
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s fNCLOSdRE ATTENDEES - DIABLO CANYON MEETING JANUARY 5, 1977 PACIFIC GAS AND ELECTRIC C0.:
NRC (Consultants):
M. Furbush N. Newmark - University of Illinois P. Crane W. Hall - University of Illinois V. Schuyler P. Henshaw - U. S. Geological Survey R. Bettinger R. Morris - U. S. Geological Survey J. Hock V. Ghio G. Lenfestey G. Blanc W. Lindblad PACIFIC GAS AND ELECTRIC CO. (Consultants):
J. Lysmer - University of California / Berkeley IP***mi J. Blume - John Blume Associates R. Gallagher - John Blume Associates D. Ray - John Blume Associates WESTINGHOUSE:
J. Dorycott W. Gangloff R. Cloud G. Bohm NRC:
W. Gammill J. C. Stepp R. Hofmann J. Knight I. Sibweil D. Jeng D. Allison
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Docket File' M,
J. Knight NRC PDR D. Ross local POR R. Tedesco TIC S. Pawlicki NRR Reading I. Sihweil LWR 1 File P. Check
~ B. C. Rusche T. Novak E. G. Case Z. Rosztoczy R. S. Boyd G. Lainas R. C. Deivung V. Benaroya D. Skovholt T. Ippolito J. Stolz V. Moore K. Kniel R. Vollmer
- 0. Parr M. Ernst W. Butler W. Gammill D. Vassallo G. Knighton L. Crocker B. Youngblood R. Clark W. Regan T. Speis D. Bunch P. Collins J. Collins C. Heltemes W. Kreger R. Houston R. Ballard S. Varga M. Spangler J. Miller J. Stepp F. J. Willimns L. Hulman unem+w R. Heinenan H. Snith H. Denton V. Stello D. Muller J. Wetmore Project Manager S. Levine A tq ney, ELD E. Kylton NRC~ participants:
W. Gammill ACRS (16) ~
J. C. Stepp R. Hofmann J. Knight i
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JAN 2 01977
_yyp Mr. James F. Devine U.S. Geological Survey Hail Stop 905 National Center - South Lake Drive Reston, Virginia 22092
Dear Jin:
This is to request that the U.S. Geological Survey review the attached doctanents pertaining to the Diablo Canyon Nuclear Power Plant Site Letter dated 19 November,1976 from James Geocaris Letter dated 3 November,1976 from Prof. James N. Brune The Geocaris letter concerns the possible length of the IIosgri fault. We realize that you have already addressed this problem in your past letters to us.
However, we desire your advido on whether Mr. Geocaris is introducing new material and wish you to address his questions specifically.
i Dr. Brune's letter concerns a possible transient high accelera-tion pulse which might be caused by rapture propagation along the Hosgri fault. Several references given by Dr. Brune over the w
telephone are also enclosed to assist in your evaluation of the safety consequences and reasonableness of his hypothesis.
Since the ACRS subcouraittee has requested our written responses to these two letters, we ask that the review be made as ex-reditiously as possible. Please give me an estimate of the sanount of time your review will require.
Sincerely, Original S!2ned b4 J.C. St30P i
l J. Carl Stepp, Chief Geology / Seismology Branch mA Division of Site Safety
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.and Environmental Analysis
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INSTITUTE OF GEOPHY5ics AND Ma9o(UMxa4Xn)(ME PLANETARY PHYSICS C*
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LA JOLLA LABORATORIES A-025 3 November 1976
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. uii ~5' Executive Director Advisory Comission on Reactor Safeguards Nuclear Regulatory Commission Washington, D. C.
20550 ATTEf.TI0ft: Mort La Barkan This letter is written at the request of.Mr. James Geocaris, and its pu'rpose is to explain the phenomenon of high frequency energy focuss'ing **1M8 by a propagating earthquake rupture and its possible relevance to the Diablo Canyon nuclear power plant.
The phenom [non of focussing of high frequency energy by a propagatin source is well known in physics. An' elementary example is the high frequenc, of sound heard from an approaching train as cocpared'to the relatively lowe:
frequency heard when the train is receding. Benioff used the principle to explain asymetry in the intensity of shaking from the Kern County, California earthquake of 1952. fiumerous other seismologists have since used it to explain similar amplitude asymetries.
In simplest terms, it is focussing of a narrow beam of high frequency energy in the direction of l
rupture.
i The simplest theoretical representation of the phenomenon sugges't that very high accelerations, several times the acceleration of gravity, migi be produced in a narrow beam (+ 5') in the direction of a propagating earth-i quake rupture under certain special c.onditions. Unfortunately, at this time it is not possible to determine t1 what extent these conditions can occur in actual earthquakes. The phenonenon has been verified and studied to a limited extent in laboratory models 2 3 in numerical computer mo'dels.
but again, it is not possible as yet to verify that the rel.evant conditions in these models occur in natural earthquakes.
There is good evidence that for many earthquakes amplitudes at i
relatively _larae distances have been increased several fold by rupture focussing.
For near-field strong motion of importance in structural design the data is too limited to be certain of the importance of the phenomenon.
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M. La Barkan Page.
3 November 1976 but several recent strong motion records, including the Pacoima Dam record of the San Fernando earthquake (H = 6.4, a = 1.25 ) and the Melindy Ranch 9
may have been affected by rupture focussing. record of the Bear 9
could be of great importance in designing and siting critical (such as nuclear power plants) near active faults.
On the other hand, it is possible that some presently unknown factors might prevent the phenomenon from being as dangerous as first appears from these elementary considerations tions that the San Simeon-Hosgri fault system is a continu coming within 5 km of the Diablo Canyon nuclear power plant, focussing by rupture propagation high accelerations, ifrom. northwest to soutneast) could lead to anomolous possibly greater than 2. At the present time it is 9
not possible to say what the probability of such high accelerations is.
Many of the factors necessary for estimating the probability are being inten-sively studied and.should be much better understood in a year or two.
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JAMES N. BRUNE Professor of Geophysics JND/nar cc: J. Geocaris G
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Biography
' Barn November 23, 193:4 Modesto, California
_Educa tion Ph.D.
(Geophysics), Columbia University, 1961.
B.S.
(Geophysical Engineering), University of Nevada,1956.
Professional Exoerience Associate Directer Institute of Geophysics and Planetary Physics Univers of California, San Olsgo, 1973-19*/6.
Chairman, Geological Research Division, Scripps Institute of Oceanogra Professor of Geophysics, University of Califernia, San Diego,1i69
. ;hy, Associate Professor of Geoph' aics, Calif.arnia Institute cf Techno1c y, 1965-1969 ; Supervisor, jSeis=ograp.. Sta,tiens (fer=erly 1. eld by C Adjunct Associate Professor of Geology, Columbia University,1954 Geophysicist, U. S. Coast and Gecderic Survey, 1954.
Research Scientist, Columbia University, 1959-1953.
Exploration Research, Chevron Cil Company,1957.
NMW Exploration Geophysics, Chevron 011 Company, 1956.
Honors President, Seismological Society of America, 1975.
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Vice President, Seismological Society of America,1969.
Board of Directors, Seismological Society of America, 1967-1972.
Grove Karl Gilbert Award in Seismic Geology, 1967.
Nominated New York Academy of Sciences, 1966, member 1970.
Fellow, American Geophysical
- Union, 1967.
First recipient of J. B. Hace1 wane Award by A.G.U., 1952.
Arthur *.. Cay Award (Toreign Co-op. Research) 1972 Professional :!embershios Geological Society of America' Seismologiell. Society of America American Geophysical Union i
National.:esearch Counell Scholarships and Fellowships i
University Fellowship in Geophysics, Colurbia University, 1957.
Higgins fellowship, Colue.bla Univercity, 1956.
Max Fleischcan., University of f*evada, two years.
Jones-Hcover Scholarship, University of Nevada, one year.
Comittees National Research Counell, Seismological Society of America
. representative, 19G7-1970.
NAS-NAE Coccittee Advicory to Environmental Science ' Serv *1ces Administration, 1970-1973.
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Biography James I;cil Brune I
i P;ge Two
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Comittees (cent)
Panel on Solid Earth Geophysics, National Committee Advisory to ESSA, National Research Council, 1968.
Panel on Seismology, NAS-NAE Committee on the Alaska earthquake,1965.
Governor's Earthquake Council,1971.
Panel on Strong-Motion Seism. ology, National Academy of Sciences, 1971-1974 Committee on Seis:nology, !!AS-NRC, 1971-1973.
Research Seismology; Earth structure; Earthquake soerce mechanism; Tectonics; Heat flow; Explosions as seistic tources; Seismic wave dispersion; Free oscillations of the Earth; Nor: cal mode and ray theory; Seismic noise; Micro-earthquakeq.
Listed
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December 8, 1976 t
James Geocaris, Esq.
Brent Rushforth, Esq.
Center for Law in the Public Interest Center for Law in the Public Interest 10203 Santa Monica Drive 10203 Santa Monica Drive Los Angeles, California g0067 Los Angeles, California 90067
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In the Matter of
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(Diablo Canyon Nuclear Power Plant, Units Hos. I and 2)
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Docket Hos. 50-275 0 L. and 50-323 0.L.
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- 'MThis is.in. response to your' letter of November 19, 1976 suggesting the ~ '.*F.',",7
':.~$ 'need for further consideration of the possibility of a Hosgri-San
....; _. ;.5 T:. Gregoria fault link up. As you are aware, the USGS report of April 29, 1.ijf.: 1976, did consider all the available information bearing on this question..%,;.C EE. -
.:@AJSpecifically, it was assumed that the Hosgri fault connected with faults
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..Y.The NRC and its consultant, the USGS, are presently reviewing the infor. 'N< 8 T.W.
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TI.l!.. logical. Society-to detemine whether any substantial new information ' '6 :
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N j.'cxists which would have an effect on the seismic design of Diablo Canyon.
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Distribution Docket File LWR-1 File D. Allison
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Z Es Hylton DEC 101976 D:cket Nos.: 50-275, 50-323 I
HEHORANDUM FOR: John F. Stolz, Chief. Light Water Reactors Branch No.1 FR0!!:
D. Allison, Project Manager, Light Water Reactors Branch No.1
SUBJECT:
DIABLO CANYON SEISMIC DESIGN BASIS The intervenors' attorney has written to the ACRS and the staff questioning whether the magnitude 7.5 earthquake on the Hosgri fault is a sufficient design basis for Diablo Canyon in light of the possible connections of this fault with other faults to the North. The ACRS has requested that we pro-vide response from U.S.G.S.
Copies of this correspondence are enclosed.
Jim Devine at U.S.G.S. has been working on an answer for about 3 weeks now
'N and will provide a responso soon. This subject was discussed in the U..S.G.S.
report concerning Diablo Canyon.
In its report the U.S.G.S. assumed that these postulated connections are real and dismissed any consecuent need to use an earthquake larger than magnitude 7.5.due to the nature of the result-ing fault system. The U.S.G.S. is checking to detennine exactly what was dcne at the recent seminar in Los Angeles before responding.
OriginalSigned By Dennis P. Aillson Dennis P. Allison, Project Manager Light Water Reactors Branch No.1 Division of Project Management
Enclosure:
as stated
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B. P.usche E. Case R. Boyd R. DeYoung D. Vassallo.
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November 29, 1976 D. Allison
,s POTENTIAL LENGIH OF THE HOSGRI FAUJ.T NEAR THE DIABLO CANYON SITE Attached is a copy of a letter to the ACRS from the Center for Law in the Public Interest which points out that some respected geologists have again, recently, expressed the view that the Hosgri fault.could link with other faults forming a system about 300 miles
- long.
The Diablo Canyon Subconsmittee Chairman has requested that we obtain coannents from you and U. S. Geological survey on the significance of-this information and its impact og the postulated magnitude 7.5
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earthquake occurring on the Hosgri fault.
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Project Review
,anch No. 1 Attacharent:
Center for Law Ltr dtd 11/19/76 cc:
B. Rusche E. Case R. Boyd.
R. DeYoung R. Heineman H. Denton W. Csamill p-}P-C. step,
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19 November 1976 i
)Mr. D de W. Moeller
- Chairman
!Advicory Committee on Reactor Safeguards lHucloor Regulatory Commission Wochington, D.C. 20555 nim
- Denr Sir
We are attorneys for soveral Intervenors in the M oblo Can maarings. yon Xpelear Generating Station operating licenso.
We are sure y'ou are aware that the Diablo Canyon nattor is now before your Advisory Cormiittee on Reactor bnfcguards.
Your Cormiittee is fccusing*on the seismic bnznrds. posed by the-Hosgri fault whicM runs 2-1/2 miles
!)ffcharo from the plant site.
s In our investigations regarding seismic hazards ist Diablo Canyon / information that could affect the mag-hitudo of an earthquake at the plant site has come to our inttantion that.the Advisory committee has not; yet considered.
ht procent, your conctittee is evaluating the scrismic.hnrards
-i-poced by a fault approximately 100 miles in length known.
A the liosgri.
Recently, respected gcologists working on Halficrnia faulting have expressed the view that the !!ottgri
- inko up to anothetr norths.coLorly trending coastal. fault, iho S'an Grucorio, to form one 300 nile long fault syst.cm i
iunning frna Point Concepcion (tFo sout!) cant end of thu iongr3 fault) aird lin:cing with the San Andreast fault north if Fan Francitico (the northwash ond of the !ian Gregorio inult).
For example, Profens:ce 1:3 3 Siler, Chairman of the lupartrmnt of Geology at the tiniversity of California at
- tuito Cruz, exprentred tho viuw in a pects. atation to the Lost Ancic8 Itanin G8ologleal suelety on November 2, It
- 7G thtst hc 11ougri hnd.' Ban Gregorlo *aro joined dit one (nult.
f h.
i As we underntand J t, thc.!!onyt'l and On crocorio go'both well mapped along m nte cf their longl. hts.
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uncertninty lies in an arca of a fcw dozen miles near Point sur on'the Contral California const.
Apparently, if this,
cran was better mapped'by geological surveying expeditions, the linkage of the two faults could be more con'vincingly-octablished or refuted.
We believe that the Ad'viiiory Committee should know d finitively whether the Hosgri is a 100 or a 30.0 mile long fcult before it settles upon an estimate of earthquake mag-nitude and other aspects of the scismic evaluation for the Dicblo Canyon nuclear plant.
We believe that it would bc mo2t inappropriate for the Advisory cortmittoa to continue thcir analysis on the basis' of a 100 mile long fsult without cxamining the views of the several reputable geologists who arb f amiliar with the relevant. data and belicyc that the
.fcult to be 300 miles long.
We urge you to consult geologists g
in the universitics and USGS who aru familiar with Central
.Cnlifornia coastal faulting *to determine the state of know-icago reg.arding the possible San Gregorio-Hosgri linkage and, crpscially, what new surveys feasibly could be underta} ton in
'tha near futtire to est'ablish or rnfute the' existence of the
. link..
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In your investigation of this mattier, we urgo you Ccpacially to seek out views of reputable, independent gCologists, Throtigho6t the history' of the siting and con-ctruction of the Diablo Canyon plant, independent ~ scientists.
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hava sounded the warnings about oifshore ' faulting that have prcven true, only t6 be ignored by the Nuclear Regulatory C:x:r.innion and Pacific Gas and Electric. Company.
For cxar.sple, during the construction licensin'g' phase, geologist Robcrt curry, who recently has done work on the geological disaster at the Toton Dam, varned the Cer=tission and utility combany I
chout offshore faulting.
But th.t Toir.nior ion never ordered curveys for faulta under the*ocoan nor did the utility take offnhovo surveyn.
More recently, Clarenco 'pn31, Chaittaan of the ccolo93* Department at the tinivornity of Califoruin at Los Angulco, publinted a definitivo artjolo in Science (li.ceen.bor ~E,
3 0'IG, Volues: 190, pp. 1291-1294) bororo ther7!Te'Er Regula-tcry connittnion would acknow]cdg.: h La repente.i u.irnlu.j t t h.st.
- m: int once. of t.bu 100 mile long Ilottf r1 'y ent.)lo.fints' of t.he Lhn Jan:iary,19M report by oil compan fault. wan trun.
- i Wo* trunt the Advinon y Commit tco wlli condue.?t a l
thorourjh inventination of the potential lit nyrl-Man Cres,sorio linhage wit.h propur attention t.o t.hu vlown of reputabu indepetulant ncient. int.u nn voll ar; the Staf f of the thi. h.tr Itcyula L ory,Commitution.
Wo would approciato hearint; from you t
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Hr, Dade W. Hoc 11er 19 Noycmber 1976 6
regarding your plans for such an investigation at your earlicst convenienec.
Yours sincercly,*
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James Geocaris cc Dale Bridenbaugh'.
Phillip Crane, Jr.
Richard Hubbard Gregory Minor Dr. David Ohrent J.ames Tourtellotte
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Nr. James Tourtellotte f.
Mr. Dow Davis "T d~'.ald
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3 U.S. Nuclear Regulatory Commission Wachington, D.C.
20555 Gentlemen:
A few days ago one of us talked with Mr."Dhvis rzgarding new information on the fault running 2-1/2 miles
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cffchore from the Diablo Canyon plant site.
Several reputable
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g2 ologists who have done extensive work on the California coastal faulting now believe that the Hosgri fault links up to' the San Gregorio fault to form a massive 300 mile-long
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fault system that, in turn, runs into the San Andreas fault n:rth of San Francisco.
Several of the ' geologists who hold
,this belief are now reporting their views publicly.
For example, Professor Eli Silver, Chairman of the Department of Geology at the University of California 'at Santa Cruz, r2 ported 1is view earlier this month at a program sponsored by the Loc Angeles Basin Geological Society that the Hosgri 4 and San G:egorio formed a single fault system.
We realize that some of the Nuclear Repalatory C mmission's consultants' at U.S.G.S. do not share the views of Silver and others regarding the connection of the Hosgri and San Gragorio.
However, we beleive this divergence of cciantific opinion over a matter that could affe.ct the mag-nitude of a credible earthquake at the Diablo plant site ch uld be resolved so that the Commission's seismic analysis procceds c.n a realistic basis.
We do not think the seismic cnnlycir
>r Diablo Canyon should proceed upon a fundamental
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the length of the fault and the potential magnitute if an earthquake on the fault, with which several
.rcputablu,cientists disagree.
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Mr."Jcmas Tourtellotto 19 Novnmber 1976 7eir. ' Dow Davis
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In light of this new information, we would like to m2et with you and the Diablo Canyon project manager, Mr.
Dannis Allison, to discuss this matter of the Hosgri-San Gregorio link.
We are interested especially in discussing gaologic surveys of the possible site of the Hosgri-San Gregorio linkage around Point Sur that might confirm or refute the connection of the two faults.
If such surveys are feasible, we believe that it is the regulatory responsi-bility of the Nuclear Regulatory Commission to undertake them before the Diablo plant is licensed.
Frankly, gentlemen, our investigation of the history of this case has left us most unimpressed with the regulatory zeal of the Commission.
Your decision not to require surveys for offshore faulting during the construction license phase and your apparent foot-dragging in confirming the work of Hoskins and Griffins is incomprehensible to us.
We trust that, with operating licensing of the Diablo plant imminent, ycur evaluation of the potential Hosgri-San Gregorio linkage will be more thorough and prompt.
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Yours sincerely,
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t Brent N. Rushforth' Mh
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James Geocaris
'c c a Dale 3 rid'enbaugh Phillip Crane, Jr.
Rich rd Hubbard Gregc.y Minor i
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