ML19317E964
| ML19317E964 | |
| Person / Time | |
|---|---|
| Site: | Oconee  |
| Issue date: | 04/01/1977 |
| From: | Neighbors D Office of Nuclear Reactor Regulation |
| To: | Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8001070759 | |
| Download: ML19317E964 (4) | |
Text
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i DOCKETS NOS.: 50-269/ 0/287 DATE:
APR 1 1977 LICENSEE:
DukePowerCompany(DPC)
(
FACILITY:
Oconee Nuclear Station SlM SRY OF MEETING HELD ON MARCH 23, 1977, CONCERNING THE J0CASSEE DAM On March 23, 1977, we met 'with representatives of Duke Power Company and its consultants concerning the Jocassee Dam and the seismic activity in the Jocassee Dam area. The meeting was held at the Jocassee Dam.
1 A list of attendees is attached.
The discossions of the meet 4r g basically followed the agenda set forth in the meeting notice and as attached. Duke Power Company made presen-tations covering the pertinent items of discussion.
The ultimate goal of this meeting was to obtain information concerning the Jocassee Dam and the related seismic activity and to establish monitoring requirements for the seismic activity in the ama of the dam with appropriate reporting of unusual or abnomal activity to NRC as soon as possible. Duke Power Company proposed a seismic network of at least four stations in the Jocassee environs and reports to NRC when an earthquake of magnitude greater than 3.0 or more than 100 events per weok are observed.
We stated that we wanted to consider this proposal and would inform DPC of any additional requirements we feel necessary.
In the interim. DPC will report as it proposed.
We requested DPC to provide a short term peport sum.arizing the infor-mation to date using the meeting agenda as an outline.
DPC agreed to this and we agreed to provide DPC a letter indicating the type of l
infomation we feel should be in the report.
l We also stated that a long term report may be desired at the end of the i
monitoring program depending on the results of the program.
D. Heighbors, Project Manager l
Operating Reactors Branch #1 Division of Operating Reactors l
Enclosum:
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List of attendees f
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Meeting Summary for 2-Apg ig Duke Power Company Docket File NRC PDR LOCAL PDR ORB #1 Reading NRR Reading B. C. Rusche E. G. Case V. Stello K. R. Goller D. Eisenhut T. J. Carter A. Schwencer D. Ziemann G. Lear I
R. Reid R. Clark L. Shao R. Baer W. Butler B. Grimes Project Manager Attorney, OELD OI&E (3)
- 5. M. Sheppard Participants (NRC)
R. Fraley, ACRS (16)
T. B. Abernathy J. R. Buchanan
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Rn DISCUSSION ITEMS FOR MEETING WITH DUKE POWER COMPANY OCONEE/J0CASSEE DAM 1.
Geology and Seismology Staff Objectives 2.
Specifics of Seismic Network Operation a.
Statien locations b.
Network capability - magnitude and threshold, distance and depth capability c.
Discussion of hypocentral activity since July 1976, including focal plane solutions d.
Reporting procedures to NRC staff 3.
Specific Information on Geologic Reconnaissance of Site Area a.
Location of discovered faluting b.
Basis of fault age dating c.
Available photos of dam abutnents and foundation d.
Subsurface geology - models
- 4. - Reservoir-Induced Seismicity e a.
Similarities - difference Jocassee to known damaging earthquakes 5.
Sismic Adequacy of Dam a.
Construction progress photos /airphotos b.
Groundwater elevation before/after dam filling (time-head plots) c.
Embankment construction specifications (engineering properties for design and basis, density, gradation of all zones, settlement and alignment of crests and slope as a function of time) l APR 1 1977
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, d.
Serpage rates (relief wells, weiss, drains)
-e.
Simple strain computations to assess approach to threshold of cracking core f.
History of inspections and repairs to date g.
Sensitivity of dam to surface fault movement (thickness and location of filters, strain distribution - rough calculations) h.
Time - acceleration plot of expected earthquake (reference.12 g for 5.6 ML earthquake - considerations, basis justification) 1 We request personnel that can discuss the above items and other related peripheral items be present at the meeting.
This should include the i
seismological consultants and dam engineers.
t APR 1 1977
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