ML20148U337
| ML20148U337 | |
| Person / Time | |
|---|---|
| Site: | Black Fox |
| Issue date: | 11/14/1978 |
| From: | Gallo J ISHAM, LINCOLN & BEALE |
| To: | Johnson W, Salzman R, Sharfman J NRC ATOMIC SAFETY & LICENSING APPEAL PANEL (ASLAP) |
| References | |
| NUDOCS 7812070008 | |
| Download: ML20148U337 (3) | |
Text
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e, BLACK VEATCH 6212 DIN 22175 TEL #913' 967 1000 C ONS ULTING ENGINEERS T r a. t s 42 01-63
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- t 4 Public Service Company of Oklahoma ELV Project 6212 Black Fox Station Tile:
6212.210.1121.21 Interim Ma;) ping Report October 14, 1978 Public Service Company of Oklahoma P.O. Box 201 Tulsa, Ok12 horn 74102 Attention:
Mr. 7. N. Ewing
- Manager, EFS Nuclear Proj ect Gentlemen:
Please find enclosed three (3) copies of the interim geologic r.apping report requested by V. L. Conrad.
If you require further information on this subject, please contact Mr. P. R. Zaman.
Very truly yours, BLACK 6 VEATCH 4-
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SHANNON & WILSON,INC.
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\\ \\ \\. ( C> l 2.i N 1105 North 38th Street Seattle, Washington 98103 Telephone: (206) 632 6020 Cable: GEOSAW October 13, 1978 PSOllAcg roy, 3 ~.,,
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Black 6 Veatch Consulting E*igineers P.O.
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Dr.
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Project Manager E-m---.___,,
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PUBLIC SERVICE COMPANY OF OKLAHOMA, BLACK FOX STATION, GEOLOGIC ANOMALIES Geologic Anomalies at the Black Fox Station Site This interim report summarizes the current status of the geologic investigations of the anomalies exposed i.- the excavation for the proposed Unit 1 at Black Fox Station.
A north-trending linear anomaly in the Drywood coal in the vicinity of the proposed Unit 1 was originally identified in subsurface studies for the Black Fox Station PSAR.
Strati-graphic correlations of both the coal and a deeper sandstone bed indicated that this anomaly is a depression in the coal bed that is not reflected in the deeper sandstone strata.
On the basis of the boring data for the PSAR studies, the anamalous depression was interpreted to have formed by deposition of the coal in an ercsional channel cut in the underlying Savanna shale.
This ovidence is discussed in the PSAR Subsection 2.5.1 and Appendix 2B, Section 2B.5.5.2, and is depicted in Figures l
1 2B.5-14, 2B,5-15 and 2B.5-16 of the PSAR.
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i Geologic mapping of excavations for Category I structures is l
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being performed in accordance with Section 2.5.4 of the PSAR.
The excavation and trenching program for Unit 1 was designed to l
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1 Williani L Lhannon. P.E = Stanley D Wilson. P.E tconsvitanti Eaft A Sibicy, P.E
- Waf.er L WDht. P.E
- Haymond P. Miller, P F
- Lipmund D Schwa'2 P G
- Dand E Hilts. P.E
- Derek H Cornfo'th P E M. Mike Alliactin, P.E.
- Rohn D Abbott. P.E
- Robert J. Deacon, P G
- George Yamone. P.E
- Masnce D Vedich. P.G L
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- P@rtlans * @an Fronalam
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Black 6 Veatch E 6 'l 6212 Attn:
Dr.
M.
J. Robinson "Oc'tober 13, 1978 Page 2 I
c>: pose the anomalous depression as well as any other geologic fectures that might underlie the proposed Unit 1.
The original plans called for two north-south trenches and two east-west 1
trenches to be excavated through the Drywood coal.
When the initial anomalous offset in the west flank of the depression was exposed in two of these trenches, six additional trenches were excavated to evaluate the offset.
Of a total of ten trenches, eight now cross and two approximately parallel the linear trend of the depression.
These trenches have a cumulative total length of approximately 1400 linear feet.
The geometry of the depression in the coal bs6, as exposed in the trenches, is essentially as depicted in the PSAR.
- However, the sequence of Pennsylvanian strata exposed in the trenches indicates that the depression is not occupying an erosional channel, but was formed by penecontemporaneous deformation; i.e.,
by folding or offset of the sedimentary strata that occurs either during deposition or shortly thereafter by consolidation of the sediments.
In this instance, the penecontemporaneous deformation resulted from differential compaction of a highly compressible underclay that lies directly below the coal.
l The trenching exposed five offsets within the Pennsylvanian strata, all of which appear to be associated with the depression.
The largest of these offsets is exposed along the west flank of the depression and is present in all of the east-west trenches.
It censists of a low-angle slippage plane dipping 10-17 (from the horizontal) that has resulted in a horizontal separation of the coal bed between 6.5 and 10 feet, and a vertical separation of 1.5 to 2.5 feet.
The offset, which has a normal sense of
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R-3405-01 Black'6 Veatch'
.B&Y 6212
. Attn:
Dr M.J. Robinson Oc~tober 13, 1978 Page 3 I
displacement, locall. is taken up along a scries of rotat:cnxi slumps rather than along a discrete slippage plane.
Informatics accumulated to date indicates that this offset is the resul; i-of penecontemporaneous 6eformation associated with the decelop-ment of the depression.
Tne other smaller offsets exhibit similar slippage planes, wi t 'r the same low angle of displacement as the offset described aboce.
All of these offsets-have displacements of less than two feet, have varying strikes, and typically cannot be traced betweer trenches.
Thus far, it has been determined that twc of the offsets do not cut the complete section of Pennsylvaniar strata e:;ptsed in the trenches.
Preliminary findings indicatt that all of ? ". e smaller offsets also were formed by penecontenporar.eous deforma:1cn.
The gecloc.ic investic.ations of these off. sets are ccntinuine. ir order to further evaluate the origin of the offsets fcund ir the Unit 1 excavation.
If these minor offsets are the result of penecontemporaneous deformation, as currently indicated, the; occurred during Pennsy'1vanian time (280 to 320 million years l
ago).
Furthermore, if the offsets are of penecentemporaneous origin, they are non-tectonic and, therefore, by definition in 10 CTR Part 100, Appendix A, Seismic and Geologic Siting Criteria, paragraph 13 I (e),
they are not faults.
i SHANNON & WILSON, INC.
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Oxd Maur1ce D.
Veatch Proj ect Manager MDV:In ec:
PSO D.
N. Clayton H.
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BLACK FOX STATION SERVICE LIST XC:
Mr. Cecil Thomas U.S. Nucicar Regulatory Com ission Phillips Building 7920 Norfolk Avenue Ecthesda, Maryland 20014 Mr. Jan A. Norris Environmental Projects Branch 3 U.S. Nuclear Regulatory Commission Phillips Building 7920 Norfolk Avenue Bethesda, Maryland 20014 Mr. William G. Hubacek U.S. Nucicar Regulatory Cotrission
- - - - -- Office of Inspection and Enforcement Region IV 611 Ryan Plaza Drive, Suite 1000 Arlington, Texas 76012 Mr. Gerald F. Diddle General Panager Associated Electric Cooperative, Inc.
P.
O.
Box 754 SprinEficid, Missouri 65801 i
Kr. Maynard llutan Ceneral Manager j
k*cstern Tarr,ers Electric Cooperative P. O. Box 429 j
Anadarko, Oklahoma 73005 4
Michael I. Miller, Esq.
Isham, Lincoln 6 Beale One 1st National Plaza Suite 4200 Chicago, Illinois 606D3 Mr. Joseph Gallo Isham, Lincoln 6 Ecale 1050 17th Street N.W.
Washington, D.C.
20036 Robert A. Franden, Esq.
Green, Feldran, Hall L Woodard 816 Enterprise Eldg.
Tulsa, Oklabora 74103