PY-CEI-NRR-0697, Forwards Third Quarterly Seismic Monitoring Rept for Util Operated Micro Net.Rept Includes General Description of Automated Seismic Telemetering & Recording (Autostar) Sys, Geographical Layout & Identification of Equipment

Forwards Third Quarterly Seismic Monitoring Rept for Util Operated Micro Net.Rept Includes General Description of Automated Seismic Telemetering & Recording (Autostar) Sys, Geographical Layout & Identification of Equipment

ML20238B748
Person / Time
Site:	Perry
Issue date:	08/17/1987
From:	Edelman M CLEVELAND ELECTRIC ILLUMINATING CO.
To:	NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM)
Shared Package
ML20238B749	List: ML20238B755 PY-CEI-NRR-0697, Forwards Third Quarterly Seismic Monitoring Rept for Util Operated Micro Net.Rept Includes General Description of Automated Seismic Telemetering & Recording (Autostar) Sys, Geographical Layout & Identification of Equipment
References
CON-#189-8102 2.206, PY-CEI-NRR-0697, PY-CEI-NRR-697, NUDOCS 8708210442
Download: ML20238B748 (2)

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(. 3A t THE CLEVELAND ELECTR P.O. sox 5000 - CLEVELANo, OHIO 44101 - GLEPHoNE (216) 622-9800 - l ILLUMINATING BLDG - 55 PUBLICSoVARE Serving The Best Loca' va in the Nation i

MURRAY R. EDELMAN GR VICE PRESIDENT ]

NUC LE AR August 17, 1987 PY-CEl/NRR-069 7 L d

Document Control Desk U. S. Nuclear Regulatory Commission Washington, D. C. 20555 Perry Nuclear Power Plant Docket Nos. 50-440;50-441 Third Quarterly Seismic Monitoring Report

Dear Sir:

Enclosed for your information is the Third Quarterly Seismic Monitoring Report f or the CEI operated micro-net, which is monitoring an area around two waste injection wells located about three miles south of the PNPP site. Our first two reports provided information relative to data collection with portable seismic instrumentation which has been in the field since February 1986. This i

report will address information f rom both the portable instrumentation and the recently completed semi permanent digital ' AUT0 STAR' ( Automated Seismic Telemetering and Recording) system. This report includes a general description of the AUT0 STAR system including geographical layout, identification of equipment and monitoring sensitivity criteria.

The new system has been essentially operating this entire quarter, however this has been primarily the " shake down" period for this custom designed digital recording / processing equipment. While there has been essentially no down time for system f ailures, there have been the expected data t transmission problems associated with start-up. Most of these transmission difficulties have been corrected and the system is now supplying CEl with a very high quality data set for detailed analysis. The system has been designed to detect very small events (Mc = 0 or smaller) within its aperture and will also detect larger events outside its aperture. Since the systems' primary mode of data collection, transmission, storage and analysis is digital, it is superior to analog only recordings. This report and future reports will primarily utilica this information for seismic analysis.

As in our previous reports, CEl will provide information of interest f or earthquakes recorded by our network which are outside its aperture. This information typically has already been shared with other institutions operating seismic networks. In particular, CEI continues to work very closely with John Carroll University through review and interpretations of significant records.

8708210442 870817 PDR N ADOCK 05000440 PDR Il l

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L Document. Control Desk PY-CEI/NRR-0697 L August 17, 1987 L.

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- For this quarter there was very little seismic activity recorded in the vicinity of the injection wells. In fact, only five micro-seismic events were detected,. four occurring on May 1 and 2,1987,' and one on July 7,1987; bringing ~ the total to 16 since recording- started in this area.

No definite conclusion.can be. reached on the origin or causal mec hanisc for these micro events. .It's anticipated that significantly more dat a collection will be required bef ore any well founded and scientifically just:.fied theory can be properly established.

In a more regional sense, the system recorded 3 events outside i ts aperture including a magnitude 5.1, 2.7 and 3.7 located 670, 65 and 31 ka f rom the site,-

respectively. The magnitude 3.7 event near Ashtabula, Ohio or J11y 13,1987 was not felt at the site and the in plant seismic monitoring system tape i recording trigger of .005g was not activated. The micro-net a_po recorded several aftershocks in the Ashtabula area following the July 13 event. Since this event occurred two days before our cut off date for data collection, and because all of the records have not been examined, any further discussion of the event will appear in the. next quarterly report as needed.

This report will continue to be submitted on a quarterly basis, with the next report due approximately November 1,1987. In the interim, your staff will be kept informed of our continued efforts and study results. ,

Very truly urs, lh et Murray R. Ed .. man Senior Vice President Nuclear Group MRE: cab

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E cc T. Colburn )

! K. Connaughton Leon Reiter l

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