ML20010C171
| ML20010C171 | |
| Person / Time | |
|---|---|
| Site: | Midland |
| Issue date: | 08/11/1981 |
| From: | Wells R CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| To: | Harold Denton Office of Nuclear Reactor Regulation |
| References | |
| 13358, OC0781-0392A100, OC781-392A100, NUDOCS 8108190214 | |
| Download: ML20010C171 (3) | |
Text
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ll r.
J Consumers Power James W Cook 0
Vice President - Projects, Engineering and Construction General offices: 1945 West Pernell Road, Jackson, MI 49201 * (517) 788 0453 August 11, 1981 Harold R Denton, Director Office of Nuclear Reactor Regulation US Nuclear Regulatory Commission Washington, DC 20555 MIDLAND PROJECT DOCKET NOS 50-329, 50-330 MIDLAND SITE SPECIFIC RESPONSE SPECTRA i
FINAL REPORTS, PARTS I, II AND III - DISCUSSIONS REGARDING 1966 PARKFIELD EARTHQUAKE ACCELEROGRAMS FILE:
B2.5.2, 0505.802 UFI:
42*05*22*01, 70*0l*10*02 SERIAL:
13358 ENCLOSURE:
BASIS FOR THE REJECTION OF THE 1966 PARKFIELD EARTHQUAKE ACCELEROGRAMS FOR USE IN MIDLAND PLANT SITE SPECIFIC SPECTRA To meet the commitment made in our meeting with the NRC staff on June 30, 1981 we are forwarding forty (40) copies of the report titled " Basis for the Rejection of the 1966 Parkfield Earthquake Accelerograms for Use in Midland Site Specific Spectra." This report is in response to discussions with the NRC staff concerning the use of accelerograms from the Parkfield, California earthquake of 1966. The discussions presented in the enclosed report address the appropriateness (or non-appropriateness) of these accelerograms for use in the site specific response spectra developed for Midland site as presented in Parts I and II of the report.
Included with this report is a letter by Dr Otto Nuttli which addresses the same issue.
We have earlier submitted to the NRC Part III of the report titled " Seismic Hazard Analysis." In the development of site specific response spectra in Parts I and II, no credit whatsoever was taken for the very low probability of occurrence of a seismic event in the vicinity of the Midland Plant site. At the same time, occurrence of an earthquake event with a relatively high deterministic value of M = 5.3 1 0.5 at a close epicentral distance was b
required to be the basis for chosing accelerograph records.
Since only Part III of the report addresses the low seismicity of the region near the plant site, we request a formal review of Part III. The evidence of very low seismicity of the region forms another basis for not including 1966 Parkff ald earthquake accelerograms for use in the Midland site specific response jg
- spectra, p h We feel that the er., losure addresses the concerns of the NRC staff and 3
[
provides sufficient bases for the exclusion of the 1966 Parkfield earthquake I
accelerograms from site specific response spectra data set.
In addition, the oc0781-0392a100 0103190214 810811 l PDR ADOCK 05000329' a
rg.s
2 results reported in Part III further support our conclusions as reported in Parts I and II.
Therefore, we request a timely approval of the spectra submitted in Parts I and II to support completion of the Soils Hearing.
4 Wells Executive Manager For J W Cook JWC/TRT/cr CC RJCook, Midland Resident Inspector w/o t-oc0781-0392a100
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BCC RCBauman, P-14-312B, t;/o WJBeckius, P-24-602, w/a JEBrunner, P-24-513, w/a WJCloutier, P-24-611, w/a LHCurtis, Bechtel (3), w/a RHolt, Weston Geophysical, w/o GSXeeley, P-14-113B, w/a RPKenuedy, SMA, w/a DBMiller, Midland (3), w/a MIMiller, IL&B, w/a FJMiraglia, NRC (2), w/a OWNuttli, St Louis University, w/a TJSullivan/DMBudzik, P-24-517, w/o RLTeuteberg, P-24-507, w/a TRThiruvengadam, P-14-400, w/a l
I oc0781-0392a100