ML19246A526
| ML19246A526 | |
| Person / Time | |
|---|---|
| Site: | Yellow Creek  |
| Issue date: | 05/24/1979 |
| From: | Lefevre H Office of Nuclear Reactor Regulation |
| To: | Denise R Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML19246A521 | List: |
| References | |
| NUDOCS 7907030253 | |
| Download: ML19246A526 (6) | |
Text
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NUCLEAR REGULATORY COMMISSION W ASHINGTON. D. C. 20555 p
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m24e Docket Nos. 50-566 50-567 MEMORANDUM FOR: Richard P. Denise, Assistant Director for Site Technology, DSE hrfRobertF. Jackson, Chief THRU:
v Geot:.iences Branch, DSE 0
$.ichard B. McMullen, Acting Leader Geology and Seismology Section Geosciences Branch, DSE FROM:
Harold E. Lefevre, Geologist Geology and Seismology Section Geosciences Branch, OSE
SUBJECT:
SITE VISIT AND MEETING - YELLOW CREEK NUCLFAR PLANT, EXCAVATIONS FOR UNITS 1 AND 2 On Friday Mey 11, 1979, representatives of the NRC, the Mississippi Geological Survey, the Geological Survey of Alabama, the U. S. Army Corps of Engineers, the Tennessee Valley Authority and its consultant met at the Yellow Creek site. The purpose of the site visit and meeting was to inspect and discuss foundation conditions and to verify the continuity of geologic strata exposed in the excavations.
The trip report relative to the geologic aspects of the inspected excavation is attached as Enclosure 1.
Dr. G. Franklin of the U. S. /.nmy Corps of Engineers will provide a report to the NRC discussing the site geotechnical engineering aspects. When received, tri Corps of Engineers report will be placed in the Public Documents Room.
The participants of the site visit-meeting are identified on Enclosure 2. is the site visit agenda.
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- L Harold E. Lefevrf, Geologist Geology and Seismology Section Geo;;.iences Branch, DSE
Enclosure:
As stated 2N 13 cc:
See next page 7007030253.
Richerd P. Denise M I' M cc: w/ enclosure R. Baer H. Rood R. G. Ryan R. Denise R. Jackson L. Heller H. Lefevre J. Greeves J. R. Harris, Region II G. Franklin, Corps of Engineers A. Bicker, Mississippi Geological Survey J. Kidd, Geological Survey of Alabama R. Miller, Tennessee Div. of Geology PDR Local PDR ACRS (17) 274 123
ENCLOSURE 1 YELLOW CREEK NUCLEAR PLANT, UNITS 1 & 2 THE TENNESSEE VALLEY AUTHORITY DOCKET NOS. STN 50-566 AND STN 50-567 Site Excavation Inspection and Meetings of May 11, 1979 Site activities included pre and post-inspection meetings and an examination of the Unit 1 and Unit 2 excavations, including the location of the Emergency Cooling Water Spray Ponds.
The attached agenda (Enclosure 3) prepared by TVA personnel with NRC input, lists the specific subject matter discussed prior to the site inspection.
TVA indicated that encountered conditions,both geologically and geotechnically, were as anticipated and as presented in the Preliminary Safety Analysis Report.
Excavation Inspection Excavation of the lower portion of the well-consolidated Mississippian Fort Payne Formation, is essentially (99%) complete.
Our examination indicated that this rock, which will serve either directly or indirectly as the bearing stratum for most of the Seismic Category I structures is an unweathered, massive, compctent, very silty limestone devoid of solution cavities.
The joints that are preser.t are, for the most part, tight and unweathered with spacing between joints varying from approximately one foot to as much as 80 feet.
Joint spacing is based upon final grade geologic maps of the Unit 1 and Unit 2 Seismic Category I excavations. We have been informed by TVA that the mapping of Unit 1 excavation is almost 100% complete while only 20% of the Unit 2 excavation is mapped.
No faulting or other structural anomalies were observed at the site in either the Lower Fort Payne or the overlying extensive exposures of the Upper Fort Payne.
274 124
2_
An outcrop of the lower member of the Cretaceous Eutaw Formation near the site of the Emergency Cooling Water (ERCW) Spray Ponds was examined.
The Eutaw is predominantly a fine-grained sand with some thin clay seams. This type of material is to be used as an impervious liner for the ERCW Spray Ponds.
Post-Inspection Meeting Following a caucus of NRC, Alabama, Mississippi, and Corps of Engineers representatives, the consensus as expressed to TVA was that no geologic abnormalities were observed in the site area in either the Lower Fort Payne or the overlying formations.
Dr. Gus Franklin expressed some concern relative to the use of the Lower Eutaw as an impervious liner for the ERCW Spray Ponds because of the sandy nature of the material.
TVA indicated that a year's monitoring cf the water levels in tne ERCW Spray Ponds would preceed use of these ponds.
This was acceptable to Dr. Franklin. Huwever, Dr. Franklin requested that TVA notify him when the ERCW Spray Pond excavations were completed in order to inspect the underlying Upper Fort Payne Formation.
TVA agreed to so notify Dr. Fri..
.o through the NRC.
274 125
ENCLOSURE 2 YELLOW CREEK NUCLEAR PLANT UNITS 1 & 2 THE TENNESSEE VALLEY AUTHORITY 00CKE7 N05. STN 50-566 AND STN 50-567 Site Visit of May 11, 1979 LIST OF ATTENDEES NRC Geological Survey of Alabama H. Lefevre J. Kidd Mississippi Geological Survey,
Corps of Engineers A. Bicker G. Franklin Tennessee Valley Authority TVA Consultant C. Burshears E. Russell J. Ellis C. Floyd C. Glidewell F. Hand N:588Erberg D. Terrill S. Thickman P. Threlkelu M. Price (Part Time) 274 126
ENCLOSURE 3 AGENDA NRC VISIT TO THE YELLOW CREEK SITE
'IO REVIEW FOUNDATIONS AND ENGINEERING PROCEDUFIS May n, 1979 1.
General Overview A.
Introduction (C. Glidewell)
B.
Review of Area Geology (E. E. Russell)
C.
Review of Seismology (F. R. Hand)
D.
Description of Soils Encountered (F. R. Hand)
E.
Description of Rock Encountered (C. Burshears)
F.
Review of TVA Cc=nitments (J. Ellis) 2.
TVA's Foundation Program and Status of Work A.
Foundation Specifications (C. E. Floyd)
B.
Foundation Inspection Team (P. H. Threlkeld)
C.
Current Status of Founiation Preparation Including Geologic Mapping (C. Ptrshears)
D.
Remaining Foundation Work (C. Burshears) 3 Tour of Site Foundation
!+.
Exit Meeting 274 127 (1)