ML20237G039
Text
., y h~f Y
i, d '. '.
a U.S. DEPARTMENT OF COMMERCE ENVIRONMENTAL SCIENCE SERVICES ADMINISTRATION COAST AND GEODETIC SURVEY ROCKVILLE, MD.
20052 September 21,. 1967 C2}
IN REPLY REFER TO:
j Mr. Harold L.
Price Director of Regulations U. S. Atomic Energy Commission
-Washington, D.
C.
20545
Dear Mr. Price:
In accordance with your. request, we are forwarding 10 copies of'our report on the seismicity of Diablo~Can-yon, San Luis Obispo County, Calif ornia.
The Coast and Geodetic Survey has reviewed and evaluated the information on the seismicity of the area presented by the applicant in their " Preliminary Safety Anal-ysis Report," and find that it is satisfactory with respect to both distant and nearby earthquakes.
W
.e have also included a statement'about the tsunami run-up at the site.
l If we may be of further assistance to you, please do y
not hesitate to contact us.
Sincerely yours, b.
.e C.
- Tison, j
ear Admiral, U E SA Director Enclosure l
L 3125 8708130288 070729 PDR FOIA 4
CONNDR87-214 PDR
4 REPORT ON THE SEISMICITY OF THE i
NUCLEAR PLANT AT THE DIABLO CANYON SITE, CALIFORNIA f
I At the request of the Division of Reactor Licensing of
)
i the Atomic Energy Commission, the Seismology Divisi.on of 1
the Ocast and Geodetic Survey has evaluated the seismicity j
of the area around the proposed reactor site in Diablo Can-l yon, San Luis Obispo County, California, and has reviewed
]
s the similar analysis made by the applicant in the Prelimi-nary Safety Analysis Report of the Nuclear Plant at the Diablo Canyon Site, Pacific Gas and Electric Company.
The l
applicant's seismicity report is complete for both nearby 1
1 and distant earthquakes which may have affected the proposed site.
The study of sources of the potential maximum earth-
]
I quakes along the San Andreas Fault, the Nacimiento Fault, j
the Santa Ynez Fault and the San Andreas aftershocks west of j
this fault includes not only a review of the historical earthquakes but a discussion of those parameters related to the earthquake frequency spectrum as fault length, depth of focus, slip and duration of strong shaking.
l l
Based upon the review of the seismic history and re-1 lated earthquake frequency spectrum data and the related i
geologic considerations, the Coast and Geodetic Survey agrees with the applicant's statement of 0.20 g at the site and on I
G w__________________._______._
4 4
I 1
2 rock for the predicted maximum ground accelerations of the design earthquake and twice this value, 0.40 g on rock for I
safe shut-down conditions.
We believe this value (0.40 g)
I would provide an adequate basis for designing protection j
against the loss of functions of components important to I
safety.
For tsunami runup at this site we recommend that it be protected to a vertical height of 30 feet above mean lower i
low water.
U.
S. Coast and Geodetic Survey Rockville, Maryland 20852 September 18, 1967 l
I
_ _ _ _ _ _ _ _