ML15245A144
| ML15245A144 | |
| Person / Time | |
|---|---|
| Site: | Oconee  |
| Issue date: | 10/29/1979 |
| From: | Reid R Office of Nuclear Reactor Regulation |
| To: | Parker W DUKE POWER CO. |
| References | |
| NUDOCS 7911150083 | |
| Download: ML15245A144 (3) | |
Text
Sistributi on:
Docket files (3)
Attorney, OELD NRC PDR (3 I&E (3) 2 9
TERA RJackson JRBuchanan, NSIC Gray file Orb #4 Rdg, Dockets Ros. 50-269 NRR Rdg.50-27V BKGrimes and 50-287 DEisenhut LShao WGammill Mr. William 0. Parker, Jr.
JRMiller Vice President - Steam Production RVollmer Duke Power Company TJCarter P. 0. Box 2178 WRussell 422 South Church Street RREid Charlotte, North Carolina 28242 RIngram MFairtile
Dear Mr. Parker:
Since 1976, the NRC staff has been reviewing the potential impact of reservoir induced earthquake activity at Lake Jocassee on Jocassee dam and the Oconee Nuclear Power Plant located about 11 miles downstream. Seismic activity was associated with the reservoir filling in 1975. The largest event was a magnitude (ML) 3.2 earthquake on November 25, 1915. Since 1975 seismic monitoring at Lake Jocassee has continued, although the rate of seismicity dropped. On August 25, 1979, a magnitude 3.6 earthquake occurred near Lake Jocassee. There were about 15 aftershocks in the week following the eafthquake. More recently, on September 25, 1979, a magnitude 2 earthquake occurred near the lake.
Therefore, we request Duke Power Company to inform the Operating Reactor Project Manager by telephone of any unusual activity as soon as possible after the event. Unusual activity should be considered any of the following:
- 1. any eahhquake larger than magnitude 2.0
- 2. more than 100 events per-week
- 3. any plans to change water level in the reservir by more than 5 feet in one day or 10 feet in one week.
In addition, the Branch Chief, Operating Reactors Branch #4, should be notified by letter of any earthquake larger than magnitude 2.5 in the vicinity of the Oconee Nuclear Station or Lake Jlcassee. The letter should include the magni tude and hypocenter of the event. If the earthquake is felt, summaries of intensity reports should be included in the report. A copy of at least one "typical" seismogram should be included to show data quality and type of seismic activity.
Sincerely, Originat stned-byhg I obert W.i OFFI ORB#4,D0R-
.... Robert.W.Reid, Chief.
OR#4: DOR Operating Reactors Brnch#4.RReid.
Oavision of Operating Reactors DtL.F, 0/ /79 10/ /7
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G'OVErN LENT PRIN4TINJG OFFICE: 1979-289-369.
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UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, 0. C. 20555
.-October 29, 1979 Dockets Nos. 50-269, 50-270, and 50-287 Mr. William 0. Parker, Jr.
Vice President -
Steam Production Duke Power Company P. 0. Box 2178 422 South Church Street
- Charlotte, North Carolina 28242
Dear Mr. Parker:
Since 1976, the NRC staff has been reviewing the potential impact of reservoir induced earthquake activity at Lake Jocassee on Jocassee dam and the Oconee Nuclear Power Plant located about 11 miles downstream. Seismic activity was associated with the reservoir filling in 1975. The largest event was a magnitude (ML) 3.2 earthquake on November 25, 1975. Since 1975 seismic monitoring at Lake Jocassee has continued, although the rate of seismicity dropped. On August 25, 1979, a magnitude 3.6 earthquake occurred near Lake Jocassee. There were about 15 aftershocks in the week following the earthquake. More recently, on September 25, 1979, a magnitude 2 earthquake occurred near the lake.
Therefore, we request Duke Power Company to inform the Operating Reactor Project Manager by telephone of any unusual activity as soon as possible after the event. Unusual activity should be considered any of the following:
- 1. any earthquake larger than magnitude 2.0
- 2. more than 100 events per week
- 3. any plans to change water level in the reservoir by more than 5 feet in one day or 10 feet in one week.
In addition, the Branch Chief, Operating Reactors Branch #4, should be notified by letter of any earthquake larger than magnitude 2*.5 in the vicinity of the Oconee Nuclear Station or Lake Jocassee. The letter should include the magni tude and hypocenter of the event. If the earthquake is felt, summaries of intensity reports should be included in the report. A copy of at least one "typical" seismogram should be included to show data quality and type of seismic activity.
Sincerely, Robert W. Reid, Chief Operating Reactors Branch #4 Division of 'oerating Reactorsl cc:
See next page
Duke Power Company cc:
Mr. William L. Porter Duke Power Company Post Office Box 2178 422 South Church Street Charlotte, North Carolina 28242 J. Michael McGarry, III, Esquire DeBevoise &.Liberman 700 Shoreham Building 806 15th Street, N.W.
Washington, D. C. 20005 U. S. Nuclear Regulatory Commission Region II Office of Inspection and Enforcement ATTN: Mr. Francis Jape P. 0. Box 85 Seneca, South. Carolina 29678 Mr. Robert B. Borsum Babcock & Wilcox Nuclear Power Generation Division Suite 420, 7735 Old Georgetown Road Bethesda, Maryland 20014 Manager, LIS NUS Corporation 2536 Countryside Boulevard Clearwater, Florida 33515 Oconee Public Library 201 South Spring Street Walhalla, South Carolina 29691
.