ML19269E806
| ML19269E806 | |
| 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 |
| References | |
| NUDOCS 7906290657 | |
| Download: ML19269E806 (6) | |
Text
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k UNITED STATES g
NUCLEAR REGULATORY COMMISSION p
WASHINGTON, D. C. 20555
%.....+'
Docket Nos. 50-566 E 24 W9 50-567 MEMORANDUM FOR: Richard P. Denise, Assistant Director for Site Technology, DSE hfRobertE. Jackson, Chief THRU:
!/ Geosciences Branch, DSE
$41 chard B. McMullen, Acting Leader Geology and Seismology Section Geosciences Branch, DSE FROM:
Harold E. Lefevre, Geologist Geology and Seismology Section Geosciences Branch, DSE
SUBJECT:
SITE VISIT AND MEETING - YELLOW CREEK NUCLEAR PLANT, EXCAVATIONS FOR UNITS 1 AND 2 On Friday May 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. Army Corps of Engineers will provide a report to the NRC discussing the site geotechnical engineering aspects. When received, the 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.
ibd)) D C)/UN A!
n f Harold E. Lefevre, Geologist Geology and Seismology Section Geosciences Branch, DSE
Enclosure:
As stated cc: See next page 2145 064 7906290 [ 7
Richard P. Denise MAY 2 4 a 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) 2145 065
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, competent, very silty limestone devoid of solution cavities. The joints that are present 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.
2145 066
. 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 Meetina 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 of the water levels in the ERCW Spray Ponds would preceed use of these ponds. This was acceptable to Dr. Franklin. However, 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. Franklin through the NRC.
2145 067
ENCLOSURE 2 YELLOW CREEK NUCLEAR PLANT UNITS 1 & 2 THE TENNESSEE VALLEY AUTHORITY DOCKET NOS. 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. Franklir Tennessee Valley Authority TVA Consultant C. Burshears E. "ussell J. Ellis C. Floyd C. Glidewell F. Hand N:588Erberg D. Terrill S. Thickman P. Threlkeld M. Price (Part Time) 2145 068
ENCLOSURE 3 AGENDA NRC VISIT TO TIE YELLOW CREEK SITE TO REVIEW FOUNDATIONS AND ENGTN M TTIG FROCEDURES May 11, 1979 1.
General Overview A.
Introduction (C. Glidewell)
B.
Review of Area Geology (E. E. Russell)
C.
Review of Saismology (F. R. Hand)
D.
Description of Soils Encountered (F. R. Hand)
E.
Description of Rock Encountered (C. Burshears)
F.
Review of TVA Comnitments (J. Ellis) 2.
TVA's Foundation Program and Status of Work A.
Foundation Specifications (C. E. Floyd)
B.
Foundation Inspection Team (P. H. Thre1keld)
C.
Current Status of Foundation Preparation Including Geologic Mapping (C. Burshears)
D.
Remaining Foundation Work (C. Burshears) 3 Tour of Site Foundation 4.
Exit Meeting 2145 069 (1)