ML19329F355
| ML19329F355 | |
| Person / Time | |
|---|---|
| Site: | Midland |
| Issue date: | 06/20/1978 |
| From: | Varga S Office of Nuclear Reactor Regulation |
| To: | Howell S CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| References | |
| NUDOCS 8006250439 | |
| Download: ML19329F355 (5) | |
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Distribution:
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.i NRC PDR M. Ernst i
Cdhcket Fih. Denise ELD i
R. Boyd IE(3)
R. DeYoung Docket Nos: 50-329
- 0. Vassallo bcc:
50-330 F. Williams J. Buchanan, NSIC S. Varga T. Abernathy, TIC
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Consumers Power Company R. Mattson RTTN: Mr. S. H. Howell D. Ross T. Cardone Vice President J. Knight L. Reiter 212 West Michigan Avenue R. Tedesco Jackson, Michigan 49201 H. Denton V. Moore Gentlemen:
R. Vollmer StBJECT:
REQUEST FOR ADDITIONAL INFORMATION ON GEDLDG SEISN0 LOGICAL MATTERS We have reviewed your responses to our acceptance review questions by our Geosciences Branch, and find that additional information is W-required to continue our review of geologic and seisete aspects of i
,' *3 the Midland site.
These additional requests are listed in Enclosure 1.
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We request your response to these first round requests by July will be unable to meet this data so that we any ad 31,1978
-1 accordingly.
i Should you require clarification of these requests, do not hesitate to contact us.
Sincerely, Original signed by:
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- 4. A. Varga 1
Steven A. Varga. Chief
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Light Water Reactors Branch No. 4 Division of Project Management
Enclosure:
j As stated THIS DOCUMENT CONTAINS j
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V JUN 2 01978 Consumera Power Company ces:
Michael I. Miller, Esq.
Isham, Lincoln & Beale Suite 42u0 One First National Plaza Cnicago, Illinois 60670 Juda L. Bacon, Esq.
Managing Attorney Consumers Power Company 212 West Micnigan Avenue Jackson, Michigan 49201 Mr. Paul A. Perry
' Secretary Consumers Power Company 212 W. Michigan Avenue Jackson, Micnigan 49201 Myron M. Cherry, Esq.
One IBM Plaza Chicago, Illinois 60611 Honorable Curt Scnneider Attorney General State of Kansas Topeka, Kansas 66612 Irving Like, Esq.
Reilly, Like and Schneider 200 west Main Street Baoylon, New York 11702-James A. Kendell, Esq.
Currie and Kendall 135 North Saginaw Road Mialand, Michigan 48040 Louis W. Pribila, Esq.
Michigan Division Legal Department 47 Building Dow Chemical USA Mialand, Michigan 4d640 Lee Nute, Esq.
Micnigan Division The Dow Chemical Company
. 47 Builaing
- Midland, Michigan 48640
4.
ENCLOSURE l-
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JUN ' ) G79 2
361.0 Geosciences Branch 361.3 According to Section 3.7.1.1 you have increased the design response spectra shown in Figures 3.7.1 and 3.7.2 by 50% in the 0.2 to 0.6 second pa.riod range so as to account for dif ferences between the "Housner developed" and'hevmark developed" design spectra. It appears to us that'the corrected spectra would still fall below the Regulatory Guide 1.60 spectra anchored at 0.12g.
This would be particularly evident for prestressed concrete structures where there is no dif ference in acceptable damping levels between that used in design and that indicated in Regblatory Guide 1.61 (i.e. 5%). Prepare comparative plots at different damping levels of the actual design tima histories and Regulatory Guide 1.60 spectra anchored at'similar reference accelerations. Discuss the differences and the adequacy of the present daalgn with respect to Regulatory Guide 1.60 at all frequencien of interest.
361.4 You conclude that the Michigan Basin fits the Appendix A to 10 CFR Part 100 description of a tectonic province.
Yet the basin is characterized by the same geologic structural features nad has essentially the same geologic and tectonic history as the remainder of the Central Sthble Region (Eardley,1962).
a) The Precambrian basement ecmplex in the Michigan basin does not appear to be unique w'th respect to the surrounding reg!on.
b) The Precambrian' crustal features, the Keweenawan rift zone I
(see Hinze and others,1975, on.the Mtd-Michigan gravity anom,1y associated with the Keweenawan rift zone) and Grenvilic Front,
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361-2 JUN 2 01973 transect the boundary of the basin.
c) The subsidence and deposition in the basin occurred concurrently with subsidence, arching, and doming in other parts of the Central Stable Region during-the Paleozoic.
'Please provide information demonstrating the distinct characteristics of the Michigan basin which distinguish it from the Central Stable Region.
Include geophysical and remote sensing data which may reflect structural' characteristics of the Basin and ajoining portions of the Central Stable Region.
361.5 The basis for your definition of the safe shutdcan earthquake rests upon the acceptance of the Michigan Basin as a separate tectonic province.
The staff has been reluctant to accept sub-division of the Central Stable Region into -smaller tectonic i
provinces.
P rovide additional information such as a comparative analysis of historic and instrumental sclamicity that would permit acceptance of a lower reference acceleration than that normally used for the Central Stable Region (0.20g).
Include in your analysis all those events listed in " Seismic Disturbances in Michigan" Circular 14, Geological Survey Division, Department of tratural Resources, Senee of Ilichigan (1977) or provide a rationale for their exclusion.
The analysis should compare the seismicity of the region within 200 milea o f the site with other similar sized areas' in the Central ~ Stable Region.
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s-JUN 20 1979 REFERENCES FOR GEOSCIENCES-REQUEST (361.0) 1.
Docekal, J. (1970) Earthquakes _of Stable '[nterior, with Enphesis on the Mid' continent.' Ph.D. Dissertation, University of. Nebraska.
2.
Hinze, W. J.,LR. L. Kellogg, and M. W. 0'Hara (1975).
Geophysical Studies of Basement Geology of Southern Peninsula of Michigan, American Association of Petroleum Geologists Dulletin Vol. 59 pp 1562-1584.
3.
Eardley, A. J.1962, Structural-Ceology of North America,1 Harper.and Row, New York, NY.
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