ML20210T363

Forwards Site Analysis Branch Site Suitability Testimony Input for Foundation Engineering Aspects.No Foundation Considerations Exist That Would Preclude Acceptability of Site

ML20210T363
Person / Time
Site:	Satsop
Issue date:	05/20/1975
From:	Harold Denton Office of Nuclear Reactor Regulation
To:	Deyoung R Office of Nuclear Reactor Regulation
References
CON-WNP-1779 NUDOCS 8605300089
Download: ML20210T363 (2)

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WPPSS NUCLEAR PROJECT UNITS 3 & 5 DOCKET NOS.: STN 50-508/509 -

SITE SUITA3ILITY BY: J. T. GREEVES There are no known foundation hazards such as bearing capacity failures, excessive differential settlement, slope failure or liquefaction at the WPPSS Nuclear Project Units 3 & 5 or immadiate vicinity presenting a risk to the proposed power facilities.

4 The site is located on a ridge at the northern edge of the Willapa Hills approximately 1.5 miles south of the confluence of the Chehalis River and Satsop River in the Grays Harbor County in the State of Washington. The ridge at the plant location is presently at approxi-

. mately elevation 480 feet (ms1). The general plant grade will be I

graded to elevation 390 feet (msl) and the plant foundation will be located at elevation 320 feet (msl).

The fresh sandstone of Astoria formation is the bearing stratum for all Category 1 foundations. The Astoria formation is divided into four material types: residual soil, weathered sandstone, fresh sand-stone and tuff. Residual soil extends from the ground surface to the top of the weathered sandstone. Weathered sandstone grades to fresh sandstone with increasing depth and can be differentiated on the basis of color change. Tuff beds have been encountered in some areas and i are identified by color, hardness and mineralogy. .

The foundetion cf the Cate; cry I structures will bc cn tha frede voud-stone. The fresh sandstone under the proposed foundation is gray caarse to fine grained sandetene eith leu to =ederate hardness. Thc bearing capacity nnd settic=ent analyses -indicate that the fresh sand-stone will provide adequate foundation support.

Slope stability analysis presented in Section 2.5.5 and the landslide investigations presented in App. 2.5.L show there is adequate safety against slope failure in the plant area.

Surface and subsurface investigations by the applicant include geologic

' mapping, drilling, trenching, geophysical surveys, remote seusing .

techniques, aerial photography, comprehensive literature search, as well as extensive laboratory and field testing. Subsurface investi-gations have been utilized by the applicant in order to define the foundation conditions within the site area.

From our analysis and evaluation of available foundation engineering data, including the results of investigations performed by the appli-cant, we have concluded there are no foundation considerations that i

- would preclude the acceptability of the site.

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