ML20211G502
| ML20211G502 | |
| Person / Time | |
|---|---|
| Site: | Perry, 05004408  |
| Issue date: | 06/17/1986 |
| From: | Edelman M CLEVELAND ELECTRIC ILLUMINATING CO. |
| To: | Butler W Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML20211G508 | List: |
| References | |
| PY-CEI-NRR-0478, PY-CEI-NRR-478, NUDOCS 8606190457 | |
| Download: ML20211G502 (2) | |
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THE CLEVELAND ELECTRIC ILLUMIN ATING COMPANY P O. BOX 5000 -
CLEVELAND, OHIO 44101 - TELEPHONE (216) 622-9800 - lLLUMINATING BLDG - 55 PUBLICSQUARE Scrving The Best Location in the Nation MURRAY R. EDEl. MAN uTcte$'n ' EN June 17, 1986 8
PY-CEI/NRR-0478 L Dr. 4. R. Butler, Director BWR Project Directorate No. 4 Division of BWR Licensing U.S. Nuclear Regulatory Commission Washington, D.C.
20555 Perry Nuclear Power Plant Docket Nos. 50-440; 50-441 Possible Impact of Injection Wells, Injection Well Monitoring Network
Dear Dr. Butler:
As discussed with your staf f during the progress meeting of April 31, 1986 and June 11, 1986, CEl has been extensively studying the local injection wells pursuant to SSER No. 9 Confirmatory Activity, "Possible Impact of Injection Wells." CEI engaged a consultant from the University of South Carolina specializing in induced seismicity to assist our primary geological /
seismological consultant Weston Geophysical. Our work related to this study is now complete and will be described in this transmittal.
Attachment No. 1 is a comprehensive study by our specialist of the injection wells and their relationship to the Janaury 31, 1986 earthquake. This report examines documented historical induced seismicity associated with injection wells and compares those events in detail to the January 31, 1986 earthquake.
Also examined are the desiga and operating parameters associated with the local injection wells and the historical record.
This report concludes that the theory promoting that the Leroy earthquake was induced by well injections is not substantiated based upon the characteristics of induced seismicity. Thus, the Leroy earthquake is considered a natural event.
However, based upon limited potential of induced micro-seismicity (unrelated to the January 31, 1986 event), and the recommendations by the ACRS during the March 12-13, 1986 hearings, CEI is developing a seismic monitoring network around the injection wells. Attachment No. 2 represents a preliminary description of the injection well network which has a magnitude detection threshold of 0 on the Richter Scale.
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Dr. W. R. Butler 1 June 17, 1986 PY-CEI/NRR-0478 L Important characteristics of the injection well system include the following:
5 station telemeter array digital data acquisition and transmission capability _to detect and locate coordinates of micro-seismic events broad based recording range up to 100 Hz We are in the process of locating suitable geophone locations for the injection well system taking into consideraton foundation conditions, power availability and telemetry obstructions. We anticipate that equipment selection, procurement and installation Will be completed during the last quarter of 1986.
The existing temporary systes will be maintained and operated until the
' injection well system is operational. The injection well system will be operated up to the second refueling outage _at which time it's continued operation will be re-evaluated. Records f rom this monitoring program will be examined continuously and the staf f will be notified if any micro-seismic events are recorded.
With the transmittal of this information, the Confirmatory Activity in SSER No.
9 related to injections wells is complete.
Please feel free to call if you have any questions.
Very trul yours,
y Murray R. Edelman Senior Vice President Nuclear Group MRE:nje Attachment ec: Jay Silberg, Esq.
John Stefano (2)
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