ML19270H351
| ML19270H351 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 04/07/1979 |
| From: | Philbrick S AFFILIATION NOT ASSIGNED |
| To: | Quittschreiber Advisory Committee on Reactor Safeguards |
| References | |
| ACRS-CT-1101, NUDOCS 7906260632 | |
| Download: ML19270H351 (1) | |
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i SHAILER S. PHILBR!CK
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m joy // 37 y/.p f CONSULTING ENG NEERING GcOLOGIST UHACA. N. Y.14850 so7 257.1957 117 TotAs uNE 7 April 19??
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i Huclear F.egulatory Commission 1717 H 3 rect,.. 7
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Dear 5ir:
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Tollowire are T.y corments on the :'.C review of certain data requested of the Southern California Edison Cccpany on i
structural conditions in the vicinity of the San Onofre I
Uuclear Foer Ilant presently under construction, at 3an Onofre, California. The review took place on ASril 3, 4 and 5, 1979 and consisted of oral and graphic presentations on April 3, field observations by helicopter over flight and ground inspection on April 4,and ground observation on April 5..
U-2 photos had beer analyzed by 3C wi+h a view to finding other lineaments than had been previously recognizec and considering the structural implications of these lineaments.
Along Christianitos Canyon small steep angle faults were viewed at two places along one of the lineaments. The relationchip between the faults and the linear.ents were coincidental, in my 3
opinion, because interstream ridges on both sides of the canyon showed no notching or depression on the line of the lineament.
l The faults were overlain with undicturbed soil in one place and at the other by a contir.ucus layer of cravel above the bed I
rock. Thus the lineament was not associated v:ith any active
'aul ting.
Faults in Horno Canyon and Dead Dog Canyons were beveled by the gravels on the old abrasion platform sinilarly to the i
beveling of the Christianitos fault closer to the plant and thus are older than the age of the platfort,about 125,000 yearc.
In Target Canyon, the case is different. Chere a lanc..ard dipping fault cuts the basal gravels on the platform with an upli.'t reaward of about one foot. Displacenent is re;crted to continue upward to within abcut S or 10 feet 'ron -he ground curfa ce. Land. arc of '-he thic ?cature are coveral subparallel fractures, without offce: of "he platform..ur;ter laivard ancthcr fracture near the culvert likewise cuts 'he platform, slighcly, and dipc landward. _ nose features have been argued to be landclide fractures derived from cottlement of a larce cass further lancward.
This io hard to ecc. Li%er. ice the su meation iha: the seaside of the fractures have been overthruct from *he cea is hard to understand. These are minor breaks, thoucands of years old and not affecting the present cround curface.
Sinbreyyo/:d sb 2342
's40 790626069-d hA h M hVibt_ck
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