ML19350D697

Requests Addl Info Re site-specific Seismic Spectra for Facilities.Util Must Verify That Accelerograph Records at Tolmezzo Site Are Not Influenced by Dam Structure

ML19350D697
Person / Time
Site:	Midland
Issue date:	05/06/1981
From:	Tedesco R Office of Nuclear Reactor Regulation
To:	Jackie Cook CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.)
References
ISSUANCES-OL, ISSUANCES-OM, NUDOCS 8105180408
Download: ML19350D697 (10)

Text

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ase UNITED STATES 4*

,og NUCLEAR REGULATORY COMMISSION o

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Mr. J. W. Cook N

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Vice President 7

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1945 West Parnall Road Jackson, Michigan 49201

SUBJECT:

STAFF REQUESTS FOR ADDITIONAL INFORMATION REGARDING SITE SPECIFIC SEISMIC SPECTRA FOR MIDLAND PLANT, UNIT 1 AND 2 During a meeting of April 16, 1981, we discussed the results of the staffs review of Part 1 of your seismic report by Weston Geophysical Corocration, forwarded by your letter of March 2,1981 for the Midland plant, and entitled Site Specific Response Spectra-Original Ground Surface. That discussion indicated that the sensitivity tests listed below should be completed on the input parameters used for the site specific spectra.

Accordingly, we request that you discuss why these items should or should not be incorporated 'into the Midland data set, and provide appropriate spectrum plots (50th and 84th percentile). canparing the specific sensi-tivity tests to the spectrum submitted in Part 1:

1. Restrict the epicentral distance of the data set (Table 2 of the Part 1 submittal) to 25, 20, and 15 kilometers and less.

2. If station subsurface soil conditions and shear velocity profiles are appropriate (match the Midland data set), include the following records from the 1966 Parkfield earthquake:

Cholame #5, Cholame #8, Cholame #12. Also restrict the epicentral distance.of this new data set to 25, 20, and 15 kilometers and less.

3. Plot the Forgaria-Cornino station subset for ML = 5.4 i.5 and Mt = 5.4 1.a.

Discuss the observed variations.

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4. The instrument at Tolmezzo is described as being on the left abutment of a concrete dam.

Verify that the accelerograoh records at this site are not influenced by the presence of the dam structure and that these records are indeed representative of free field recordings.

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5. If the Toimezzo station is included, discuss why 2 sets of records from Tolmezzo for the May 11, 1976, ML = 5.3 earthquake are used.

Does this put a double weight on this recording?

6. Discuss the strong motion records from the 1978 Santa Barbara earthquake.

If station subsurface soil conditions and the shear velocity profiles are appropriate and the data has been obtained, include these records in Table 2 of the Part i submittal. Also restrict the epicentral distance of this new data set to 25, 20, and 15 kilometers and less.

The acceleration-time histories from Lawrence Livermore Laboratories are enclosed.

7. The staff has recently obtained the acceleration-time histories for the following records used in Table 2 of the Part 1 submittal (1) May 9,.1976 Forgaria-Cornino, (2) May 9,1976 Tolmezzo, (3) May 11,1976 Tarcento.

These three sets of records were excluded from the Lawrence Livermore Laboratories data set based on the observation that parts of the accelera-tion records were missing.

Discuss this possibility.

Plot the 50th and 84th percentile of the data set in Table 3 of the Part 1 submittal excluding these three sets of records. Also restrict the epicentral dis-tance of this new data set to 25, 20, and 15 kilometers and less.

8. Include the September 11, 1976, ML = 5.9 Forgaria record in the data set. Also restrict the epicentral distance of this new data set t:

25, 20, and 15 kilometers-and less.

Should you have questions regarding the above requests, contact Mr. J.

Kimball (301)492-8083 or our Project Manager.

Sincerely, NW Robert L. Tedesco, Assistant Director for Licensing Division of Licensing

Enclosure:

As stated cc:

See next page r

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E EAI I GsY Mr. J. W. Cook Vice President Consumers Power Company 1945 West Parnall Road Jackson, Michigan 49201 cc: Michael I. Miller, Esq.

Mr. Don van Farowe, Chief Ronald G. Zamarin, Esq.

Division of Radiological Health Alan S. Farnell, Esq.

Department of Public Health Isham, Lincoln & Beale P.O. Box 33035 Suite 4200 Lansing, Michigan 48909 1 First National Plaza Chicago, Illinois 60603 James E. Brunner, Esq.

William J. Scanlon, Esq.

Consumers Power Company 2034 Pauline Boulevard 212 West Michigan Avenue Ann Arbor, Michigan 48103 Jackson, Michigan 49201 U. S. Nuclear Regulatory Commission Myron M. Cherry, Esq.

Resident Inspectors Office 1 IBM Plaza Route 7 Chicago, Illinois 60611 Midland, Michigan 48640 Ms. Mary Sinclair Ms. Bartara Stamiris 5711 Summerset Drive 5795 N. River Midland, Michigan 48640 Freeland, Michigan 48623 Frank J. Kelley, Esq.

Attorney General State of Michigan Environmental Protection Division 720 Law Building Lansing, Michigan 48913 Mr. Wendell Marshall Route 10 Midland, Michigan 48640 Mr. Steve Gadler 2120 Carter Avenue

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St. Paul, Minnesota 55108

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MhY 6 ngt cc: Commander, Naval Surface Weapons ~ Center ATTN:

P. C. Huang White Oak Silver Spring, Maryland 20910 Mr. L. J. Auge, Manager Facility Design Engineering Energy Technology Engineering Center P. O. Box 1449 Canoga Park, California 91304 Mr. William Lawhead U. S. Corps of Engineers NCEED - T 7th Floor 477 Michigan Avenue Detroit, Michigan 48226 Charles Bechhoefer, Esq.

Atomic Safety & Licensing Board U. S. Nuclear Regulatory Commission Washington, D. C.

20555 Mr. Ralph S. Decker Atoinic Safety & Licensing ~ Board U. S. Nuclear' Regulatory Commission Washington, D. C.

20555 Dr. Frederick P. Cowan Apt. B-125 6125 N. Verde Trail Boca Raton, Florida 33433 l

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