ML16245A459
| ML16245A459 | |
| Person / Time | |
|---|---|
| Site: | Oconee  |
| Issue date: | 10/01/1979 |
| From: | Rolonda Jackson Office of Nuclear Reactor Regulation |
| To: | Fairtile M Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML16245A460 | List: |
| References | |
| NUDOCS 7911010282 | |
| Download: ML16245A459 (2) | |
Text
OT 0 1 1979 MEMORANDUM FOR:
. Rairt M
Operating Reactors Branch No 4 DOR FROM:
Robert E. Jackpip, Chief Geosciences Brahph, DSS
SUBJECT:
EARTHQUAKE ACTIVITY AT-JOCASSEE DAM GEOTECHNICAL ENGINEERING ASPECTS 4
PLANT NAME: Oconee Nuclear Station/Jocassee Dam DOCKETLNUIBERS: 50-269/270/287,,
TAC Nti tER:
5290 RSPONSIBL E BRANCH:
ORB-4; Fair e
0n Augut!26, 1979 Duke PoweV Co. informed I&E, NRC that a magnitude 3.6 earthquake occurred near Jocassee Dam-On August 27, 1979 Duke Power Co. informed ORPM of the event. The Oconee project manager, Mort Fairtile, then informed Robert Jackson,.Chief, Geosciences Branch., On August 27, 1979, Dr. Phyllis Sobel, a.
seismologist in the Geosciences Branch, called Dr. Pradeep Talwani of the University of South Carolina to confirm the reported earthquake. Dr. Talwani is under USGS contract to monitor seismicity in the area of the Jocassee dam. 'A report on the earthquake is contained in theenclosed memorandum which-describes seismicity near Lake Jocassee. On August 30, 1979 Dr. Sobel called Dr. Talwani to find out if there had been any aftershocks. Dr. Talwani reported about 15 aftershocks, He also informed Dr. Sobel that he had received unconfirmed reports of increased seepage from the dam since the earthquake. Consequently, on September 4, 1979, a conference cal.1 was made to Duke Power. Participants were:
Stewart Lewis Duke Power Rod Bhatnagar Duke Power Ernie Brockman Duke Power Dudley Stone Duke Power Clay Sams
-,Law Engineering Testing Co.
Mort Fairtile
- NRC, DOR Robert Jackson NRC, GSB' Leon Reiter
- NRC, GS8 Phyllis Sobel NRC, GSB Owen Thompson NRC, GSB 791101 0 C A E 1RC FORM 318 (9176) NRCa 0240 U.S.
povannunny PaRms oPe.: 1978 -e -7o
M. Fairtile 2-OCT 01 19 Duke and Law told us that inspection of the dam by Law Engineering Co. on August 31 and September 1, 1978 had been made by Clay Sams and George Sowers.. Mr. Sams reported.to us during the conference call thattthere were no adverse affects such as cracking.due to the earthquake. He reported that seepage remaindd normal considering rainfall,-that the water was-clear at the time of their inspection and that no cracking or other effects were noticed.in-'the embankment.
He reported that the survey of settlement monuments' was not complete although preliminary data indicated that any settlement due to the earthquakes was probably less than.0.75 inches. Some cracks were noted i
k !i ated floors of the Jocassee h#dro-electric power house and the origin of these cracks (primarily whether or not they Were earthquake induced) was still under investigation because they could have existed prior ito. he eaThquake.
Mr. Lewis informed us that withi abbut a month ive would receive a written report of the inspection.
We anticipate that the report will
-reflect the o inion-of the consultants that the' earthquake has not affected the safety of the dam and thus weeexpect that no further evaluation of the earthquake effects on the dam by my geotechnical engineering, staff will be needed.
We will confirm this following our review of the consultant's report.
The Jocassee Dam is regulated by the Federal Energy Regulatory Commission (FERC) and we will continue.to work through and with themin our.evaluation.
We will continue, Yir review of seismicity at the site as discussed in a memo from Dr. P. Sobel,.Seismology Section, GSB, to'me dated August 29, 1979; a copy of that memo is enclosed.,
This geotechnical engineering review was prepared by Dr. Owen. 0. Thompson, GES, GSB.
Original Signed oy DISTRIBUTION:
E. ackson CENTRAL FILE GB RDG Robert E. Jackson',. Chief Geosciences Branch9 OSS
Enclosure:
- As stated cc w/enclosure
- 3. Knight R. Reid A
IW.
Gammill R. Jackson
- 0. Thompson C. Murphy L. Heller Local POR R. Shewmaker, IE HQ.
L. Reiter' POR
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DATE
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NmCFORM 318 (946) NRCM 0240 U.S. OOVERNMNT PRINTING OFFICE: 1978 - 28 76 9