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JCStepp Docket File RBMcMullen L Reading DAllison SEP 6 1974 LWR l-3 Reading THirons LWR l-3 File RCDeYoung AGiambusso VAMoore Docket Nos. 50-27 and 50-323 RSBoyd KRGoller FSchroeder DJSkovholt HDenton VHWilson WPGammill LWR 1 & 2 Br. Cfs.
R M ecker Edson G. Case, Acting Director of Licensing THRU: A. Giambusso, Deputy Director for Reactor Projects, L STATUS OF THE GEOLOGY AND SEISMOLOGY PORTION OF THE DIABLO CANYON OPERATING LICENSE SAFETY REVIEW The staff last met with PG&E on this item on July 5,1974. The summary of this meeting is attached as Enclosure No.1. The primary purpose of this meeting was to review the progress of the offshore geologicalinvestigations which had recently been initiated by the applicant. At that time, PG&E stated that their final report on offshore faults would be submitted to the staff by September 1,1974. The staff indicated that 30-45 days would be required for staff and USGS review of this report, and that, assuming i
favorable resolution of this item, a supplement to the safety evaluation on geology and seismology could probably be issued around mid-October of 1974. This date would conform reasonably well with the scheduled ACRS full committee meeting date of November 14-15, 1974.
In late August PG&E verbally informed the staff that their final report would be delayed abon:; three weeks from the September 1 date. hey indicated hmW that the report would discuss all field work accomplished to date, would contain some new anslysis of earthquake epicenters, and would mention the results of meetings with two oil companies regarding offshore geological data which are considered by these companies to be proprietary. He report will not contain the results of some additional (confirmatory) field work which i
PG&E is planning for September and October.
'1his three week slip will delay issuance of the SER supplement on this l
subject to app :mately the first week in November, and makes the schedule extremely tight with regard to giving ACRS and their consultants appropriate time to review the repo:.*t in time for the mid-November full committee meeting. An early Diablo Canyon ACRS subcommittee meeting emphasizing geology and seismology is scheduled for September 12,1974. At this meeting PG&E will discuss all work performed to date, although their final written report will not be avallahle at this time, his meeting will provide the ACRS and their consultants with an initial presentation on the Diablo Canyon geology j
and seismology.
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Edson G. Cirni g4 SEP V/ith regard to evaluation of the seismic potential of the offshore faults in the vicinity of Diablo Canyon, the staff and USGS will need to review PG&E's report before a final determination can be made. The staff did conclude after the July 5,1974 meeting that PG&E had undertaken a very comprehensive offshore field program. However, the feeling still prevails that it will be extremely difficult to establish the capability of these faults using conventional dating methods.
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Z mtte, gari R. C. DeYoung, Assistant Director for Light Water Reactors Group 1 Directorate of Licensing
Enclosure:
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Meeting Summary dtd July 11, 1974 p.1Pkh45!E i
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