ML20212L287

Requests Data Re Probability of Occurrence for Earthquake Resulting in Effective Max Ground Accelerations of 0.2g, 0.4g,0.5g,0.6g,0.8g & 1.2g

ML20212L287
Person / Time
Site:	05000000, Diablo Canyon
Issue date:	03/14/1977
From:	Sihweil I Office of Nuclear Reactor Regulation
To:	Stepp C Office of Nuclear Reactor Regulation
Shared Package
ML20150F500	List: IR 05000428/2005002 ML20150F498 ML20150F502 ML20150F508 ML20150F512 ML20150F548 ML20209B103 ML20209B317 ML20209C048 ML20209C418 ML20209C422 ML20209C804 ML20209C841 ML20209C858 ML20209C903 ML20209C914 ML20209C919 ML20209C959 ML20209D260 ML20209D318 ML20209D342 ML20209D443 ML20209D706 ML20209D836 ML20209E546 ML20209E553 ML20209G137 ML20212K939 ML20212K943 ML20212K946 ML20212K951 ML20212K956 ML20212K964 ML20212K968 ML20212K975 ML20212K980 ML20212K991 ML20212K996 ML20212L010 ML20212L019 ML20212L025 ML20212L029 ML20212L036 ML20212L048 ML20212L053 ML20212L060 ML20212L065 ML20212L070 ML20212L078 ML20212L085 ... further results
References
FOIA-86-391 NUDOCS 8608250275
Download: ML20212L287 (1)

Text

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DISTRIBUTION:

MAR 141977 Docket Files: 50-275 50-323 NRR-Rdg

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SEB-Rdg Docket Nos: 50-275 50-323 MEMORANDLN FOR:

C. J. Stepp, Chief, Geosciences Branch Division of Site Safety and Environmental Analysi's FROM:

I. S. Sihweil. Chief, Structural Engineering Branch Division of Systems Safety

SUBJECT:

DIABLO CANYON SITE, EARTHQUAKE OCCURRENCE PROBABILITY DATA (SER:1111)

As a part of our overall effort in the OL review of the subject plant, we are proceeding with Dr. Newmark to assess a range of failure probabilities for Category I structures, systems and components given occurrence of earthquakes of varying "g" values at the site.

In this connection, Dr.

Newmark requested that we provide him the earthquake occurrence probability data (or recurrence periods) associated with a range of maximum ground motion "g" values (up to 1.20g) pertinent to the Diablo Canyon site. The availability of these data to Dr. Newmark within a week or so should signif-icantly expedite his work. Therefore, we are requesting that the Geosciences Branch provide the following data to the Structural Engineering Branch as soon as possible:

a.

Probability of occurrence for an earthquake resulting in an g

effective maximum ground acceleration of 0.75g at the plant site (most urgently needed information);

i h.

Probabilities of occurmnce of earthquakes resulting in j

effective maximum ground accelerations of 0.2g, 0.4g, i

0.5g, 0.6g, 0.8g, 1.0g and 1.2g at the site.

i j

If further clarification is needed regarding the need and technical aspects of these data, please contact Dr. Newmark directly in order to expedite the l

work.

i s609230275 e6cao' I. 5, Sihweil, Chief i

Eog[;N91 pos Structural Engineering Branch j

Division of Systems Safety cc:

R. Heineman J. Knight I'

W. Gammill R. Hofmann I

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