ML19289C894

Forwards Addl Info Re Seismic Events of 780827 & 781027. Includes Data Recorded by USGS Strong Motion Accelerometer & Extract from Topographic Map Showing Location of Accelerometer

ML19289C894
Person / Time
Site:	Summer
Issue date:	01/23/1979
From:	Crews E SOUTH CAROLINA ELECTRIC & GAS CO.
To:	Harold Denton Office of Nuclear Reactor Regulation
References
NUDOCS 7901260209
Download: ML19289C894 (3)

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SOUTH CAROLINA ELECTRIC a GAS COMPANY

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CotuMe:A, SOUTH CAROLINA 29288 E. H. Ca rw s. J R.

v c . . ... . ..o c... c uv*ve January 23, 1979 Casen..ame .=o Coastuve, om Mr. Harold R. Denton, Director Office of Nuclear Reactor Regulation U. S. Nuclear Regulatory Commission Washington, D. C. 20555

Subject:

Virgil C. Summer Nuclear Station Docket No. 50-395 Seismic Monitoring

Dear Mr. Denton:

Additional information concerning seismic events near the Virgil C. Summer Nuclear Station on August 27 and October 27, 1978, has been requested by members of your Staff. The following is forwarded for your use: (1) Data relative to the seismic etents as recorded by the USGS strong astion accelerometer, and (2) Extract from a USGS topographic map showing the locations of the strong motion accelerometer and subject seismic events.

It should also be noted that a representative profile of the foundation beneath the strong motion accelerometer is shown at Station 2 + 00 on Plate 11 (Seismic Line SLC-1A) in Appendix A of " Geologic and Seismic Report - Parr Hydroelectric Project - FPC Project No. 1894" as submitted to the Federal Power Commission by South Carolina Electric & Cas Company.

If additional information becomes ecysary,wewillbehappytodiscuss the matter with the Staff.

e ti ly yours, E. H. C ws, Jr.

RW EHCJr:msd CC: Messrs. H. T. Babb G. H. Fischer W. C. Mescher W. S. Murphy W. A. Williams, Jr.

T. B. Conner, Jr.

NPCF/Dixen File 790126c0 9 .

USGS - Strong Motion Accelerometer Data

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C 0.5. STRONG-NOTIONNETWORK DIRECTI0fi* CONSTANTS 85 3 Station No. Temo. 34.30t', 81.33W 180' Sens. = 1.90 cm/g Film Speed =

Jenkinsville, S.C. Monticello Dam p=b . t- 2 time marks /sec SMA 1 No. 603 Shared Abut (Center Crest) Up Sens. = 1.75 cm/g 5 cm .

Per. = .040 sec EARTHQUAKE OF (Main Event) Damp. = 0.60 crit ,

27 August 1978, 0523 EST

27 August 1978, 1023 UTC 090 Sens. = 1.75 cm/g '

Fer. = .038 sec .t -

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Damp. = 0.60 crit

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Per. = 040 sec .

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