ML20237G164
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Files March 30, 1967 TNEUs J. F. Newell, Chief, Environmental & Radiation i
Safety Toshnelegy tranch, DEL
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I. Spiekler, anviremmental k Radittlem Safety j
Techselegy Brameh, atL TELECOM CONCEtitING EAEfBQRAKE DESIGN OF TEE DIAtto CANYON SITE -
PACIFIC GAS AIB ILBCTRIC CetpANY gg On Marek 23, 1967, a telesen was held between R. Comiter of the USGB, L. mrphy of ascs.es, Dr. m. sesmark, Dr. v. sall and F. seheuer, n. Tedesee j
J. Neue11 and I. Spiekler e.1 the staff. ve discussed the earthquake destga_
seasiderstless for W Diable Canyes - FGE E F1dat. Nr. Marphy stated that he agreed with Dr. Sudth sad Dr. bemioff's esastustoms conserains the 4 assettedes generated with the 4 types of earthpakes that might affoot i
this site. These are as follows:
4 4
1.
A masmitude 8.5 earthquake aleas the san Andreas fesit apprestestely 30 miles from the site which Mr. Nurphy laterprets to be sa intensity of 7.0 and on bedrock at the site the resulties aseeleration weeld be 0.10 g.
2.
A metattude of 71/4 stems the Neclamente fault 20 miles from the site skish Mr. Nurphy itterprets to be as latensity 8 earth pake with a resultaat acceleretten, en the bedrock of this i
site of 0.17.
3 3.
An off-shore earth pake alens the San Andreas fault 50 miles from the site resultias la sa intoastty 7 with the accelerates on bedrock of 0.10s at the site.
4.
As after shock with a megattade of 6-3/4 withis five to ten miles of the site interpreted by Narphy as an intensity 8 with an accelerates en rock of 0.173 at the site.
Based upea Mr. Murphy's evaluations of these earthquakes he feels' that the destga. earthquake should have an accelerates of 0.23 regardless of the spectra. The maximum credible earthquake should be 0.40s across the heard regardless of the spectra.
Dr. Hall and Dr. Neumark agree with this post *les.
It was pointed out that the applicant has based its desiga spea two different 1
earthquake spoetra ubich results la the containment hutidias design with the destga earthquake havlag scealeraties of.123 and a amatsam eredible earthquake of.243 It was stated that the applicant usu14 have to be informed that we have set accepted these eriteria and that la feet the class I str E.res soune save to use a.ds agensa smaquake _ ^ a - ^
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2-1 ter. Coulter pointed out that, although 'ne felt that there was as potential for differential greved movement at the site, the presamt plant layout which has the sentatessent building reattag spea a fmult might be raised se am tasue at a heartag by sa interveest. To eveld this poteektal l
problem, it might be advantageous to chasse the loostion of the ecstainment building se that it does met straddle this fastt.
It was generally agreed by everyone lavolved la the telephees eenversatten that this would be a good idea. Der. Coulter stated that the bedreek at this site is a well semented sandstone sad is severy good bedroek for the Califersia no aise romer*ed that any further empleratory emaavettom at the area.
m site is met warranted.
There will be a asettag with the applicant on Ayrti 20-21,1M7, to discuss the unclear p15st as a whole. Based upon the availability of Dr. Hall, it was deelded that the seismis destga considerations would be taken up en April 20, and that all parties should have their questless into the staff well la advance of the meeting.
se P. A. Monts E. G. Casa R. S. Boyd S. Levine R. Tedesoe K. Woodard I. Spickler l
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Form AEC.318 (Rev. 9-53)
U.s GovtRhM, NT PRINTlhG 0FTICE.19@-O-214 629
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