ML20062J487

Recommends Two Acceptable Approaches to Establishment of Acceptable Seismological Input Parameters.Top of Natural Glacial Till Is Appropriate Location for Vibratory Ground Motion Input for Site

ML20062J487
Person / Time
Site:	Midland
Issue date:	10/14/1980
From:	Tedesco R Office of Nuclear Reactor Regulation
To:	Jackie Cook CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.)
References
NUDOCS 8010280692
Download: ML20062J487 (4)

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DISTRIBUTION:

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Oncket Files FRinaldi DL:LB #3 Files ACappucci OCT 141980 ~

NRCePDR Y

Local POR bcc: NSIC

?, Docket Nos.:.'50-329/330 W ot RTedesco TIC Filiraglia ACRS (16) o DHood JLee 3

Mr. J. W. Cook ELD Vice President IE (3)

Consumers Power Company FSchauer 1945 West Parnall Road RJackson Jackson, Michigan 49201 JKimbell e

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Dear Mr. Cook:

LHeller 1

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SUBJECT:

SEISM 0 LOGICAL INPUT FOR Tile MIDLAND SITE l

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One of the open items associated with our radiological safety review of your

.,. I application for operating licenses for Midland Plant, Units 1 and 2, and

',1 identified in our letter of March 30, 1979, is the establishment of acceptable 1f seismological input parameters.

Resolution of this open item is also necessary hM.,.for approval of the remedial actions associated with the soils settlement t

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matter which was the subject of the December 6,1979 Order on Modification of Q ' ~ Construction Permits.

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As noted in your response to our previous requests 361.2, 361.4, 361.5 and

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p 361.7, you consider the Michigan Basin to be a distinct tectonic province for yq the purpose of evaluating site seismic design input, whereas during the Midland h

OL review, the staff has found insufficient support that the Central Stable Q,. Region can be subdivided into ceparate tectonic provinces.

Your approach using

'U".cs historic seismicity in the Michigan Basin resulted in 'a Safe Shutdown Earth-I

$hd1l Modified'Housner response spectra anchored at 0.129 quake (SSE) ch Discussed below is the pC staff's current view as to two acceptable approaches, either of which specifies

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the controlling earthquake from the Central Stable Region and which also re-l Q4[j,hquires,, consideration.of soil: amplification.

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i The controlling earthquake we'would currently mquire to be used in detennin-

! :@8 "in March 1937,'and'has a body wave magnitude of S 3 Mv ing the 3

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and a MMI of VII-VIII.

/f M ". Nuttli, (State-of-the-Art for Assessing' Earthquake = Hands in the United States, f i G Report 12,. Credible Earthquakes for the ~ Central U. S.:~ tMisc. Paper S-73-1 U. S.

85 Army Engineering Waterways Experiment Station,.1978)'using an alternative s

g/d;M method has 'also suggested this magnitude as the 3.5ximum" when using residual

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' ![d events'(those remaining after seismic zones such as Anna, Wabash Valley, j7 are removed)'forlthe ~ Central United States.

It is important to note that the q p duly'29,:1980 rantucky earthquake had a magnitude'of 5.1-5.4 M x

• gje e occurred 31nt a " residual area",

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J. - x gM.The,,followinglalternatives<of characterizing the SSE'world be acceptable to

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J kM:Jthe staff and are consistent with the staff's ' Standard Review Plan (SRP)-

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!!r. J. W. Cook 'The Anna, Ohio earthquake of March 9,1937 is the largest historic carth-quake in the Central Stable Region tectonic province.

This earthquake had a mI of VII-VIII and should be assumed to occur near the site (Appendix A to 10 CFR Part 100, SRP Section 2.5.2).

Using this inten-sity one acceptable approach would be based upon the standardized response spectra of Regulatory Guide 1.60 anchored at 0.199 as determined by the

- trend of the reans of the intensity acceleration values in Trifunac and Brady (Seismological Society of America Bull., V. 65,1975).

' An alternative method of describing the SSE and response spectra result-ing from an " Anna" type earthquake assumed to occur near the site involves using the magnitude. As was indicated during the recent OL review on Sequoyah, magnitude may be a more realistic estimate of earthquake size than intensity. Therefom a description of the SSE can also be obtained by

' collecting representative real time histories for a magnitude of 5.3 +.5 M epicentral distances less than 25 kilometers at soil sites.

Such a colMtion has been made by Lawrence Livermore Laboratory (LLL, Draft, Seismic Hazard Analysis: Site Specific Response Spectra Results,

$4 August 23,1979) but it would be beneficial if you update this data set as

"' ~ ' appropriate.

It is the staff's position that the representation appropri-

- ate for use in establishing the SSE is the 84th percentile of the response

, spectra as derived directly from the real time histories.

The input for the comparative analysis of your present response spectra

-(Modified Housner) and Regulatory Guide 1.60 both anchored at 0.129 was at the foundation level.

It is our conclusion that the appropriate location for '

i vibratory ground motion' input for your Midland site be at the topeof the 1

V natural glacial till (essentially the original regional ground surface). AboveI b this till is a thin sand layer which is highly variable in density and the com-

' pacted fill that was placed to raise plant grade. Therefore either of our above acceptable approaches will also require an assessment of soil amplifica-tion from the till surface.

'We are available to meet with you at your earliest opportunity to discuss the nabove approach in order.:that acceptable data and methods of describing vibra-

" tory gr 7

Dcyo.oudd motion can be utilized for the Midiand site.'

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_ " Contact cur project manager, Darl Hood, if you wish te arrange,such a meeting

'l or desire iclarification of this cletter.., : -

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" 'j'a (eg e.;ne 7 n rf lS,incerely,,

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1 First National Plaza Department of Public Health P. O. Box 33035 Chicago, Illinois 60603 Lansing Michigan 48909 4

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.Judd L. Bacon, Esq.

q Managing Attorney William J. Scanlon, Esq.

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Consumers Power Company 2034 Pauline Boulevard

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,L, 212 West Michigan Avenue Ann Arbor, Michigan 48103

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Jackson, Michigan 49201 7 :.f.

U. S. Nuclear Regulatory Conctission i{

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Mr. Paul A. Perry, Secretary Resident Inspectors Office

'j Route 7 sy Consumers Power Company Q.

212 West Nichigan Avenue Midland, Michigan 48640 k.g\\,

Jackson, Michigan 49201 i

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Ms. Earbara Stamiris yp$; f Myron M. Cherry, Esq.

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.Ms. Sharon K. Warren y !!;J:

Ms. Mary Sinclair 636 Hillcrest

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a. h Midland,: Michigan 48640 5',().FrankJ.'Kelley,.Esq.

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. k cc: Ccmmander, Naval Surface Weapons Center ATTN:

P. C. Huang G-402 White Oak Silver Spring, Maryland 20910 Mr. L. J. Auge, Manager Facility Design Engineering Energy Technology Engineering Center

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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 Bechhoeffer, Esq.

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

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Mr. Gustave A. Linenberger Atomic Safety & Licensing Board U. S. Nuclear Regulatory Commission r

Washington, D. C.

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