ML20073Q455

Informs That Error Found in Computer Program for Evaluating Equation 58 Re R Factor.Analytical Approach Used Entirely Different from Model Approach But Gives Similar Results. Results of Model Approach Justified

ML20073Q455
Person / Time
Site:	Summer
Issue date:	04/12/1983
From:	Bycroft N INTERIOR, DEPT. OF, GEOLOGICAL SURVEY
To:	King J NRC
Shared Package
ML20073Q454	List: ML20073Q452 ML20073Q455
References
NUDOCS 8304290127
Download: ML20073Q455 (4)

Text

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United States Department of the Interior GEOLOGICAL SURVEY o,

. . .e OFFICE OF EARTHOUAKES, VOLCM0ES, AND ENGIt'EERIliG j BRAliCH OF ENGIt!EERING SEISMOLOGY AND GEOLOGY 345 Middlefield Road, f'S 77 Ven1o Park, CA 94025 April 12, 1903 Dr. Jerry King

' O. S. fluclear Regulatory Comt ission

( Hall Stop P-514

) Washington, D. C. 20555

Dear Jerry:

Uc have found the error in the cmputer program we wrote for evaluating Equation 58 of the enclosed paper. t!e have now evaluated the factor R of Equation (37) of th( enclosed paper, and this is shown in the enclosed Figure 1. If this Figure 1 is compared with Figure 13 of Appandix A for the X direction, it is seen that they are reasonably close except for the region of the hut. The transfer f unction chown in Figure 14 for the Y direction is a bit different. This dif ference is, of course, not shown 'oy this theory, which rnakes them equal. Equation (58) for calculating the free-field was evaluated ' sing u the seismogram measured on the pad for the 090 direction of the 16 October 1979 event. Figure 2 enclosed shows this seisangram, and Figure 3 shows our calculated free-field. If this enclosed Figure 3 is compared with Figure 15d of Appendix A, it is seen that they are fairly close, especially for the maximum positive and neoative peaks. There are some differences in detail which are probably caused by neglecting the ef fect of the hut.

As the cmpletely analytical approach used here is entirely dif ferent from the modal approach but gives sim.ilar results, I feel that the' results of the modal approach are justified.

Sincerely, oel By coft Physical Sci utist Copy to:

T. Algemissen 8304290127 830425 PDR ADOCK 05000395 P ,

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