ML20212L916

Forwards Branch Nov 1976 Rept to ACRS Describing Rationale for Seismic Reevaluation Criteria,For Review Prior to Completion of SER Suppls.Methods for Soil Structure Interaction Analyses Should Be Addressed in Suppls

ML20212L916
Person / Time
Site:	05000000, Diablo Canyon
Issue date:	03/29/1978
From:	Allison D Office of Nuclear Reactor Regulation
To:	Jeng D, Knight J, Sihweil I NRC
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References
FOIA-86-391 NUDOCS 8608250302
Download: ML20212L916 (1)

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N MAR 2 91978 s -

Docket Nos: 50-275 50-323 tDIE 'IO:

J. Knight I. Sihweil D. Jeng R. Lipinski P. Kuo R. Bosnak P. Chen E. Sullivan FROM:

D. Allison, Light Water Reactors Branch No. 1, DPM SUiUECT: DIABLO CANYON SEISMIC DESIGN CRITERIA In Nover.t>er 1976, after considerable questioning by ACRS consultants, we wrote the attached report describing the rationale for the seismic reevaluation criteria. Please review, it to refresh your memories on that subject, before conpleting the SER supplements on the seismic reevaluation.

Possibly some of the points should be addressed again in the SER supplements..

In any event, we should discuss what has happened with regard to various things that were to be done, sucti as yielding in structures, torsion, '

tilting and overall conservatism.

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In addition, soil structure interaction analyses and/or deconvolution have been a subject of continuing controversy on this plant and in general.

i Accordingly, the Diablo Canyon methods should be speci'ically mentioned in the SEB section of the SER supplement.

i Original Signed By l

Dennis P. Allison D. Allison, Project Manager

,A Light Water Reactors Branch No.1 Division of Project Management i

Distribution:

Docket Files N. Newmark, U of Ill LWR #1 Files W. Hall, U of Ill

'D W. Gammill J. Devine, USGS

!7 J. Stepp R. Hoffmann.

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