ML19211C812

Concludes That Foundation Matl Below Water Table to 40-ft Depth Is Not Safe Against Liquefaction If SSE w/0.12 G Peak Acceleration Occurs

ML19211C812
Person / Time
Site:	La Crosse File:Dairyland Power Cooperative icon.png
Issue date:	10/19/1979
From:	Frederick Brown ARMY, DEPT. OF
To:	Knight J Office of Nuclear Reactor Regulation
Shared Package
ML19211C810	List: ML19211C809 ML19211C811 ML19211C812
References
TASK-02-04, TASK-2-4, TASK-RR NUDOCS 8001150023
Download: ML19211C812 (2)

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DEPART #ENT Oi: THE ARMY

'WAT ERWAYS EXPERIMENT. AfloN. CORPS OF ENGINEERS

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vlCKsBURG MississtPPI 39180

'2sca 10 OCT 79

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Si?JICT: Peview of liquefaction ?ctential at la Cresse.!aelear ?:ver Plant, la Cresse, 'Jisc. nsin Mr. J. ?..'* night

~

Civisien of Site Safety and g

Inv4-- ~ 'al.t.21ysis U. S. :uclear Regulatcry Cc= issica D

'iashington, DC 20555 9

Cear :'::'. Knight:

As requested by :L. Jchn Oreeves of ycur office, ve have reviewed the rep:rt entitled "liquefacticn ?ctential at *.a Cr sse Iciling 'iater Fasctor (.aCF.?R) Site " ear Senca, 7ernen Ocunty, sis:ensin," dated 10..ugust 1979, prepared by Ca.es & Mccre for Oairyland ?cver C cperative.

Danes 1 Mccre used results or "---ained eye'4a '

'ov'a' tests and dynamic stresses cenputed using the cc puter code 5?id2 to assess the liquefaction pctential at the site.

'iES believes that the labcratory strength curves used in this analysis are u. conservative. Cur experience is that Icese cchesienless sterial densifies when sampled, and this densificatica may be as great as 2 to 3 lb/cu ft.

'"able 2 of Canes L Mccre's report indicates that the specimens further densified an additional 2 to 3 lb/

cu ft fr== the frc:en cendition to the thaved and censolidated ec=dition in the laboratory. This indicates a total increase in density that eculd be as great as h to o lb/cu ft frem the in situ cenditien, and we estimate that the probable total increase in density is 3 to k lb/cu

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Tnis is a substantial change in density when ene censiders that the minimum density reported by Cases L M:cre ras apprcximately 97 lb/cu ft and the maxi =us density approximately 11h lb/cu "t.

'"his increase in density has not been taken into acccunt in the results presented by Cames & McCre.

It is cur opinion that correction for this increase in density vill substantially reduce the factors of safety presented by Eases & Moore. Cctsequently, we cannot cenclude that the site is safe against liquefaction using this apprcach.

s0011500 C 1765.\\80 W

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ESGH 19 OCT79 SU3 JECT: Review of Liquefaction Potentiu. at La Cresse :uclear ? er Plant, La Crosse, 'a'iscensin If the Standard Fenetration Test (S??) :; values presented by " ares & Moore ar a.. c ^r. a..*.ed to an c". a.. ',"~ de.a.

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