ML20004F308
| ML20004F308 | |
| Person / Time | |
|---|---|
| Site: | Midland |
| Issue date: | 06/04/1981 |
| From: | Hood D Office of Nuclear Reactor Regulation |
| To: | Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML20004F309 | List: |
| References | |
| NUDOCS 8106180137 | |
| Download: ML20004F308 (6) | |
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APPLICANT:
Consumers Power Company FACILITY:
Midland Plant, Units 1 & 2
SUBJECT:
SUtHARY OF APRIL 16, 1981 MEETING ON SEISMIC RESPONSE SPECTRA AT ORIGINAL GROUND SURFACE On Aoril 16, 1981, the NRC staff met in Bethesda, Maryland with Consumers Power Company (the applicant), Bechtel, Weston Geophysical Corporation (WGC) and Structural Mechanics Associates to discuss the development of site specific seismic response spectra for Midland Plant, Units 1 and 2.
This meetir.g reviewed the first of three reports by WGC; Part I, submitted by the applicants letter of March 2,1981, and dealing with development of the site specific response spectra for Midland applicable at the original ground surface at the site. This part discusses in detail, Midland site seismicity, site charat.teristics, selection of accelerograms and presents the resulting response spectra, median, mean and 84th percentile for 57, critical damping. Appendix A of Part I discusses in detail the geo16qical and geophysical descriptions of the strong motion recording situ and justifications as to ahy they are included in the data set for the determination Midland site specific respo'ise spectra.
This appendix and Section 3.3 and 4.1 of Part I of the report respond to the concerns raised by the NRC staff concerning site selection for the Midland data set in a December 5,1980 meeting.
The discussions of Part I responded to the comments of staff seismologist, Jeff Ximball, re'lected in his April 3,1981 memoredum (Enclosure 2).
This memorandum was earlier telecopied to the applicant for this purpose.
Except as discussed below, these comments were adequately addressed during the meeting.
l Following the presentations of WGC, the staff indicated that the sensitivity tests listed below should be completed on the inpt4t parameters used for The staff requested further discussion why these the site specific spectra.
items should or should not be incorporated into the Midland data set, and that the applicant provide apprcpriate sper.trum plots (50th and 84th percentile) comparing the specific sensitivity 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, 2C, and 15 kilometers and less.
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If station subsurface soil conditions and shear velocity profiles 2.
are appropriate (match the Midland data set), include the following f
Cholame #5, Cholame #8, records from the 1966 Parkfield earthquake:
Also restrict the epicentral distance of this new data Cholame #12.
set to 25, 20, and 15 kilometers and less.
3.
Plot the Forgaria-Cornino station subset for Mt = 5.4 +.5 and and ML = 5.4 +.4.
Discuss the observed variations.
The instrument at Tolmezzo is described as being on the left abutment Verify that the accelerograph records at this site 4.
of a concrete dam.
are not influenced by the presence of the dam structure and that these records are indeed representative of free field recordings.
If the Tolmezzo station is included, discuss why two sets of records 5'
from Tolme zo for the May 11, 1976, ML = 5.3 earthquake are use.
Does this put a double weight on th'.s recording?
Discuss the strong motion records from the 1978 Santa Barbara earthquake.
6.
If station subsurface soil conditions and the shear velocity profiles are appropriate and the data has been obtained, include these records in Also restrict the epicentral distance Table 2 of the Part 1 submittal.
of this new data set to 25, 20, and 15 kilometers and less.
The staff has recently obcained the acceleration-time histories for 7.
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, These three sets of records were excluded from the 1976 Tarcento.
i Lawrence Livermore Laboratories data set based on the observation that l
Discuss this parts of the acceleration records were missing.
Plot the 50th and 84th percentile of the data set in l
possibili ty.
Table 3 of the Part 1 submittal excluding these three sets of records.
Also restrict the epicentral distance of this new data set to 25, 20 i
kilometers and less.
11, 1976, W
= 5.9 Forgaria record in the data i
Include the September 8.
Also restrict the epicent-aT distance of this new data set to l
set.
25, 20, and 15 kilometers and less.
i Mr. R. Jackson noted that Part III of the WGC report, also forwarded by the applicant's March 2,1981 letter, would not be reviewed by the staff unless and until a need for this report was identified. Part III describes the results l
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Consumers Power Company l t
of a seismic hazard assessment of the Midland site. The results im:1ude probabilistic seismic ground motion levels and corresponding probabilistic response spectra. The hazard analysis establishes annual exceedance probabilities for several levels of seismic ground motion. The analysis incorporates alternate tectonic model definitions and an assessment of input seismic parameters. Tae objective of this study is to provide supportive infomation pertaining to the relative probabilistic levels of tne determin-istic site spectific response spectra study presented in Parts I and II of tne WGC reports.
The applicant stated that the final report of the WGC development affort, Part II, will be subnitted to the staff on or before May 15, 1981. Part II
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will develop site specific response spectra applicable at the top of the fill. As a part of this effort, theoretical studies on possible ground motion amplification through the fill is being performed and the results will be presented in this part. Similar to Pc/t I, this will have an appendix containing a detailed discussion of applicability of selected accelerometer sites to Midiand site original ground surface overlain with the fill meterial.
Mr. R. Jackson, NRR, noted that staff review of Part II would involve several technical branches and that the subject matter is somewhat innovative and complex: accordingly, establishment of review schedules and further meetings t
for Part 11 must await receipt of that report.
Viewgraph slides used during the presentations, other than figures contained in Part I, are show in Enclosure 3.
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i Darl Hood l
Licen*,ing Branch No. 4 Division of Licensing Encicsures:
As stated i
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Mr. J. W. Cook j
Vice President l
Consumers Power Company 1945 West Parna11 Road Jackson, Michigan 49201 l
cc: Michael I. Miller, Esq.
Mr. Don van Farowe, Chief Ronald G. Zamarin, Esq.
Division of Radiological Health 1
Alan S. Farnell, Esq.
Department of Public Health i
Isham, Lincoln & Beale P.O. Box 33035 Suite 4200 Lansing, Michigan a8909 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 Comission i
Myron M. Cherry, Esq.
Resident Inspectors Office p
1 IBM Plaza Route 7 Chicago, Illinois 60611 Midland, Michigan 48640 Ms. Mary Sinclair Ms. Barbara Stamiris 5711 Sumerset Drive 5795 N. River Midland, Michigan 48640 Freeland, Michigan 48623 l
Frank J. Kelley, Esq.
Attorney General State of Michigan Environmental i
Protection Division 720 Law Building Lar. sing, Michigan 48913 Mr. Wendell Marshall Route 10 Midland, Michigan 48640 j
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Mr. Steve Gadler 2120 Carter Avenue St. Paul, Minnesot 55108 i
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i cc: Commander, Naval Surface Weapons Center ATTN:
P. C. Huang I
White Oak Silver Spring, Maryland 20910 Mr. L. J. Auge, Manager Facilit" Design Engineering Energy Technclogy Engineering Center l
P. O. Box 1449 Canoga Park, California 91304 i
i Mr. William Lawhead U. S. Corps of Engineers i
NCEED - T 7th Floor
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477 Michigan Avenue Detroit, Michigan 48226 I
Charles Bechhoefer, Esq.
Atomic Safety & Licensing Board U. S. Nuclear Regulatory Commission Washington, D. C.
20555 l
Mr. Ralph S. Decker Atomic Safety & Licensing Board U. S. Nuclear Regulatory Commission l
Washington, D. C.
20555
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Dr. Frederick P. Cowan Apt. B-125 6125 N. Verde Trail i
Boca Raton, Florida 33433 i
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C ENCLOSURE 1 I
NRC/CPCo/Weston Geophy.
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~Bethesda MD - Phillips Bldg. Am. P-18 April 16 - 1981
SUBJECT:
SITE SPECIFIC EQ. SPECTRA l
SEISMIC MARGIN ANALYSIS Name Company Postion B.C. McConnel Bechtel Project-Civil Eng.
R.C. Baun.an Consumers Power Co.
Midland Project i
R.P. Kennedy SMA Consultant-Midland l
T.R. Thiruvengadam Consumers Power Co.
Midland Project E.M. Levine Veston.Geophsycial Project Coordinator
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B. Leblanc Weston Geophysical Seismologist i
Richard Holt Weston Geophysical Geophysicist l
Dennis M. Budzik Consumers Power Co.
Licensing Eng.
James Cook Consu.mrs Power Co.
VP Project'.'Eng. & Const.
Darl Hood NRC Project Mgr.
Jeff Kimball NRC/GSB Seismologist Leon Reiter NRC/GSB Section Leadsr. Seismologist i
Robert E. Jackson NRC/GS8 Chief. Geoscience Br.
Gus Giese-Koch NRC/GSB Geophysicist i
Howard Levin NRC Tech. Asst. Dir. Engr.
i George C. ".11r.kiewicz Weston Geophysical Seismologist Zenon A. Cybriwsky Weston Geophysical.
Seismologist A.J. Cappucci NRC/MEB Mechanical Eng.
r Frank Rinaldi NRC/SGB Structural Eng.
Lyman Heller NRC/HGEB Geotech. Eng..
Dinesh Gupta NRC/HGEB Geotech. Eng.
l Joseph D. Kane NRC/HGEB Geotech. Eng, j
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