ML20028A814

Forwards Revised Figure 5 to FSAR App 2J,illustrating Effect of Varying Dynamic Shear Modulus of Subgrade Soil on Seismic Response of Reactor Bldg,In Response to 821007 Request for Addl Info.Four Aperture Cards Available in PDR

ML20028A814
Person / Time
Site:	Shoreham File:Long Island Lighting Company icon.png
Issue date:	11/22/1982
From:	James Smith LONG ISLAND LIGHTING CO.
To:	Harold Denton Office of Nuclear Reactor Regulation
References
SNRC-787, NUDOCS 8211290070
Download: ML20028A814 (7)

Text

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. t gg LONG ISLAND LIGHTING COM PANY '

ssawans SHOREHAM NUCLEAR POWER STATION P.O. BOX 618, NORTH COUNTRY ROAD e WADING RIVER, M.Y.11792 s

November 22, 1982 SNRC-787 Mr. Harold R. Denton, Director Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission Washington, D.C. 20555 Reactor Building Foundation '

Shoreham Nuclear Power Station - Unit 1 Docket No. 50-322

Dear Mr. Denton:

In an October 7 letter from Mr. A. Schwencer of the NRC, LILCO was asked for additional information regarding Reactor Building settle-ment and the effect of varying the dynamic shear modulus of the subgrade soil on the seismic response of the structure. This letter responds to that request.

The plot of accumulated reactor building settlement and load time history shown in Figure 5 of Appendix 2J to the FSAR has~been ex-tended in the three sheets of the attached figure to show all data now available. It should be noted that the horizonal scale of the third sheet has been condensed subsequent to the middle of 1978 due to a reduced frequency of surveys and that data taken duriny a month have been plotted at the end of the month, (e.g. data taken in November 1976 are plotted above the word December) . The sGttlements of markers R-1, R-2, R-3, and R-4 are shown for the period through November 1976 because of construction requirements. Markers L-19 ,

and L-21 were installed equidistant from marker R-1, and marker R-3 was replaced by L-20 at the same plan location. Continuity of read-ings was easily maintained juring the transition due to the uniformity of the settlement. The FSAR will be updated to reflect the revised Figure 5.

A parametric study has been performed to determine the effect of hypothesized variations in the shear modulus of the foundation soil upon the seismic response of the Reactor Building. The shear modulus, G, was varied by +25 percent from its base value, Go, and building accelerations for both Operating Basis Earthquakes and Design Basis Earthquakes were computed at several elevations.

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e 4 november 22, 1982 SNRC-787 Page 2 The results are tabulated in Table I. The maximum computed accelerations for each elevation as shown in Table II.

4 LILCO believes that the update of information provided here will satisfy your request; however, if y'ou require further information, do not hesitate to contact this office.

Very truly yours,

. J. L. Smith Manager, Special Projects Shoreham Nuclear Power Station RSH:mp

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