ML20033D167

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Forwards Procedure for Determination of FSAR Design Curves Presenting Plots That Compare Dynamic Shear Modulus Vs Strain Design Curves W/Lab Test Values & Forwards Factors of Safety Against Sliding of Main Plant Foundations
ML20033D167
Person / Time
Site: Clinton Constellation icon.png
Issue date: 12/01/1981
From: Geier J
ILLINOIS POWER CO.
To: John Miller
Office of Nuclear Reactor Regulation
References
U-0360, U-360, NUDOCS 8112070325
Download: ML20033D167 (10)
v • d • e


Text

{{#Wiki_filter:a. o e /LLIN0/S POWER COMPANY ~ U-0360 ffgy g30gg(gg_gg).s 600 SOUTH 27TH STREET, DECATUR, ILLINots 62525 December 1, 1981 ), Mr. James R. Miller, Chief 2 80 '/ Standardization & Special Projects Branch &5

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Dear Mr. Miller:

~ Clinton Power Station Unit 1 Docket No. 50-461 Mr. B. Jagannath, HGEB reviewer, has requested plots that compare the Clinton project dynamic shear modulus versus strain dcsign curves with laboratcry test values. The attached plots, enclosure #1, present the data that has been requested. "r. Jagannath has also requested factors of safety against sliding of the main plant foundations. Enclosure #2 presents these fat ? ors of safety. Sincerely, L M cc 'd.D. Geier Manager, Nuclear Station Engineering Attactnents cc: J.H. Williams, NRC Clinton Project Manager H.H. Livennore, NRC Resident inspector B. Jagannath, NRC HGEB N. Sas&* \\ y 8112070323 811201-DR ADOCK 05000461 POR

_7 SNtr/ps;&/'rf l E i l PROCEDURE FOR DETERMINATION OFl SAR DESIGN CURVES The laboratory tests on the soils at Clinton were performed I on three different types of samples (Dames & Moore Type U, l L ~ 3-in diameter pitcher samples, and 4-in high recovery core barrel samples.) The degree of disturbance that these sam-plcs were subjected to was, therefore, different dep'ending on the sampling techniques. With this in. mind, the FSAR-Design Curves were obtained by applying disturbance factors to the laboratory data depending on the sample type. The11aboratory data was later re-analyzed and normalized-with respect-to confining pressure, overconsolidation-ratio, and void ratio, and mean values for the shear degradation ~ j. curyps' wore obta1ned in the range. 001~to 1.0 percent. Com-- paring the mean laboratory test results with the FSAR design curves giveidisturbance factors on the order of 1.5 to 4.0,. ~ which is in, fair' agreement with this analysis. i 9 4 A._

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