ML20040B719
| ML20040B719 | |
| Person / Time | |
|---|---|
| Site: | Wolf Creek  |
| Issue date: | 01/22/1982 |
| From: | Koester G KANSAS GAS & ELECTRIC CO. |
| To: | Harold Denton Office of Nuclear Reactor Regulation |
| References | |
| KMLNRC-82-155, NUDOCS 8201260351 | |
| Download: ML20040B719 (11) | |
Text
.
KANSAS GAS AND ELECTRIC COMPANY l
1 GLENN L MOE5iER w w t Pe e 4 4e s t
%,<6 sam January 22, 1982 g*] 1 l[] /, N, Mr. Harold R.
Denton, Director Office of Nuclear Reactor Regulation
'n U.S. Nuclear Regulatory Commission
[,
U' Washington, D.C.
20555 t-
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KMLNRC 82-155
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Re:
Docket No. S'IU 50-482
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Subj: Geology
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Dear Mr. Denton:
N Per discussions with the NRC Staff, transmitted herewith is an u; 3ated response to NRC Question 231.1 WC regarding site geology.
This information will be formally incorporated into the Wolf Creek Generating Station, Unit No.
1, Final Safety Analysis Report in Revision 8.
Also transmitted, tor docketing purposes, is a letter from Frank W. Wilson of the Kansas Geological Survey regarding an updated opinion on the age of the most recent faulting in Eastern Kansas.
This information is hereby incorporated into the Wolf Creek Generating S ta tion, Unit No. 1, Operating License Application.
Yours very truly,
/
-,f,
-lg;u b<
Cll$&
GLK:bb Attach cc: Mr. Jon Hopkins (2)
Division of Project Management Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission g)
Washington, D.C.
20555
'/
Mr. Thomas Vandel jg Resident NRC Inspector P.O. Box 311 Burlington, Kansas 66839 8201260351 820122 PDR ADOCK 05000482 A
PDR 201 N Market - Wochda. Kansas - Mad Address: PO. Box 208 i Wochda Kansas 67201 - Telephone: Area Code (316) 261-6451
OATl! OF Arl'IIUTATIO!1
)
) SS:
Cot:tlTY Ol' SEDGWICK )
I, Glenn L.
Moenter, of lawful age, being duly nworn upon oath, do depose, ntate and af fim that I am vice President - tiuclear of Kansan Gan and Elect ric Company, Wichita, Kannan, that I have signed the foregoinq letter o f t rannnit tal, know the contents thereof, and that all statement.s contained therein are true EMISAS GAS A!1D ELECTRIC Cot 4PA'JY A"'TE.';T :
UY /
Nlli 4WA p(
Glenn L.
tioester Vice President - tJuclear W.B. Walker, Secretary i
V STATE OF KN1SAS
)
) SS:
CotRJTY OF SEDGWICK )
BE IT Id:r'r :BCPJ:D that on this 22nd day of January, 1982 before r.e, I:velyn L Pry, a tiotary, personally appeared Glenn L. Koester, Vice President - fluclear of Kansan Can and Electric Company, Wichita, Kansas, who is po rnonally known to me and who executed the foregoing innt rument,
an1 he duly acknowledged the execution of the name for and on behalf of and as the act and deed of said corporation.
!!J WIT! JESS WilEREOF, I have hereunto set my hand anci af fixed my seal the dat" and yea r above wri tt en.
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. Fry, tiotar
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G tty 44 mission expires on August 15, 1984.
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Question 231.lWC:
Prepare a new figure (or revise an existing figure) locating the noncapable shear zones, shear planes, and faults mapped at the site and described in the FSAR (page 2.5-102).
Also prepare a table listing the above deformations, the site location of the deformation, and the Dames & Moore report where the deformation mapping and description appears.
Response
The following figures have been prepared as index maps for locating, by number, the noncapable deformation features described in the FSAR:
Figure 231.1-1:
Location of Deformation Zones e
Beyond Plant Area; l
Figure 231.1-2:
Location of Deformation Zones -
e Power Block - licumader Shale Member; e
Figure 231.1-3:
Location of Deformation Zones -
Circulating Water System and Northwest Part of Essential Service Water System - lieumader Shale Member; and Figure 231.1-4:
Location of Deformation Zones -
Southeast Part of Essential Service Water System
!!eumader Shale Member.
Tables 231.1-1 and 231.1-2 identify these zones of deformation l
by number, the location of each feature, and the appropriate Dames & Moore report containing detailed geologic maps and descriptions of these deformations within the Heumader Shale Member and other geologic units, respectively.
Rev. 8 2/82
j TABLE 231.1-2
SUMMARY
OF DEFORMATION ZONES GEOLOGIC UNITS OTHER THAN THE HEUMADER SHALE MEMBER Feature Type (s) of Deformation (s)
Number (a)
Site Location and Geologic Unit Report Reference (D) i 128 Low-level outlet Normal fault D&M 1979b tunnel Unnamed Member of the Figure 10V; revised in i
}
Lawrence Formation D&M 1981 as Figure A-1 i
129 Auxiliary spillway Shear zone D&M 1981 N.
exc. slope Heebner Shale Member Figures 110 and llR 130 Service spillway Shears, soft sediment D&M 1981 deformation features #1, Figures llH and 110
- 11-917 (no deformation Figures 11J, 11W, 11X, at #12) and 11Y Ireland Sandstone Member 131 Service spillway Shears, soft sediment D&M 1981 deformation features Figures llL and 11V
- 2-#10 Figure llH (c)
Ireland Sandstone Member aFeature numbers correspond to locations of deformation zones shown on Figure 231.1-1.
bD&M 1979b = Dames & Moore, 1979b (see FSAR Site Addendum, Section 2.5.7 for complete reference).
D&M 1981
= Dames & Moore, 1981, Results of geologic excavation mapping, Wolf Creek Generating Station, Unit No.
1, for Kansas Gas & Electric Company and Kansas City Power & Light Company:
Dames & Moore
( Aug us t 13).
cFeature #2 is located at Station 7+15, in the face of the 3:1 slope, 17 feet east of the west excavation slope.. This feature is not visible at the scale of Figure i
i 11H but is similar in appearance to the other mapped features.
Rev. 8 2/82 I
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RE V. 8. 218 2 i
j 4' s WOLF CREEK GENERATING STATION
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FIGURE 231.1-1 L
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LOCATION OF DEFORMATION e.
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KANSAS GEOLOGICAL SURVEY "mo ^"'n"'
s c"m ou s wm Environunental Geology Section 1,uw re s.re. Ku n was G(' 01 1 013 -h (,1 -1 D D 1
-t m December 25, 1981
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Mr. David F. Fenster
((7, 9k CE d
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Staff Geologist
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D A!.'IS & :.'.C C E Dames 6 Moore Q.
9 1550 Northwest liighway f>c'OU',' y b,,, 0 =,. _,e m_
Park Ridge, Illinois 6006S
Dear Mr. Fenster:
PU* R D' "J"
This is in response to your telephoned request for an updated opinion of the age of most recent faulting at or near the surface in castern Kansas.
Based on the results of our USNRC-sponsored studies to date, we believe we have geologic, geomorphic and geophysical evidence of post-hansan faulting near the surface in several areas in extreme northeastern Kansas.
n e most clear-cut example is an area near Baileyville, in testern Nemaha County. L is area was discussed previously by S. " DuBois (NUr.G/CR-0321, 1978, p. 12-14, Figure 5).
DuBois described a linear stream systen with asymmetric tributaries and paralleling narrow, linear s tream divides.
The streams are shallowly incised into unconsolidated soil and underlying *lacial till deposits in an area of relatively low-surface relief. DuBois es timated from sparse water-well data that the depth to bedrock was approximately 30-60 ft.
Two power auger holes drilled subsequently near the streams used up all the available auger stem, slightly more than 100 ft, without encountering bedrock. A later seismic reflection line across the stream trend indicated that the thickness of unconsolidated deposits, mainly Kansas glacial till and thin surficial soils, was approximately 150 ft.
DuBois pointed out that north-flowing Negro Creek, because of the angle and the way its tributaries join the main stream (see figure attached), pre-viously had flowed south. She concluded that "recent" uplift of the land surface had caused piracy of Negro Creek by an cast-flowing tributary of Turkey Creek near the northwest corner of the area.
Because of the asymmetric tributaries on the west and the tact that the crest of the narrow, linear stream divide on the west was approximtely 4 0 f t.
higlier than that on the east (see topographic profile attached), it was assumed that the relative uplift was on the west.
Although not stated, of fset n; faulting was suspected to be the most liicly cause of these anomalous geomor-phic features.
As stated earlier, a seismic profile was run at approximate r-ght angles to and across the trend of the streams at a later date.
This line was reduced and computer processed about a month ago.
About 30 to 50 f t of offset in shallow subsurface marker beds is indicated beneath the creeks.
Surp ri: ingly,
Mr. David F. Fenster - page 2 - December 28, 1981 hovever, the offset is down to the west.
Groundwater levels in the auger holes drilled near and on opposite sides of the two streams and in available nearby water wells indicate an abrupt approximate 30 ft gradient to the west, probably indicating offset of per-meabic :ones in the till. The till in this area is silty to fine sandy.
No abrupt changes in lithology are apparent, thus we do not think the streams are related to the effects of till lithology such as differential compaction adjacent to a buried sandybody or bedrock channel.
Although it cannot be rigorously proven without core drilling into bed-rock, I believe that the above evidence strongly suggests post-Kansan fault-ing. The narrow linear stream divides and the almost total absence of tri-butaries on the cast side of the two streams further suggest to me that fault-ing, if present, occurred after the development of the subdued topographic surface or during Recent (flolocene) time.
I have noted a number of similar streams and divides in areas overlain by several hundred feet of glacial till in northeastern Kansas and northwestern Mis sou ri.
In most instances, however, the short or absent tributaries and the long, narrow linear stream divides are on the west. All trend close to 15*NW.
If these linear parallel, ridge-stream systems are the geomorphic signa-ture of geologically young faulting, it is interesting to note that the 15 Nh' trend is approximately 90* to the principal horizontal compressive stress field in the central Midcontinent as reported by Sbar and Sykes and more recently by Zoback and Zoback. Under those conditions, it would be expected that any reactivation of existing faults would produce up-to-the cast reverse c
faulting and a geomorphic signature or erosion similar to the more pervasive ones cited immediately above which have long tributaries on the east or on the uplifted side and short or no tributaries on the west, adjacent to the linear ridge marking the edge of the down-dropped side.
The fact that the sense of bedrock movement of the Baileyville feature is opposite to what I would expect suggests to me that it may be caused by fairly recent reverse reactivation of a pre-existing fault by differential movement resulting from glacial rebound. The area is adjacent to the inferred boundary of the Nebraskan ice sheet and about 30 miles cast of the western margin of the Kansan ice sheet (see figure attached).
The area is also adjacent to a major inferred bounding fault on the southeast flank of the Central North American Rift System. This bounding fault is believed to have been reactivatcd as a right lateral wrench fault during the Cretaceous. The Baileyville feature is properly aligned to have been a minor thrust or reverse fault associated with that sense of movement.
If my interpretation is correct, then the inferred Recent movement may he associated with glacial rebound and is not strictly tectonic.
60 Bfr. David F. Fenster - page 3 - December 28, 1931 The longer features in NE Kansas and NN Flissouri may be associated with the contemporary stress field. This has not been and, perhaps, cannot be p rove n. The hhite Cloud earthquake of 1927 occurred on the projection of one of those linear streams and we have recorded microcarthquakes in the same area.
Because geologically young deposits are rare in the unglaciated part of eas tern Kansas, it is difficult to determine the age of most recent faulting.
llowever, under my direction and NRC funding, Kim Eccles recently completed an Fl.S. thesis at Kansas State University.
!!is work consisted of field studies of an area underlain by the trace of the liumboldt fault zone in northwestern Wabaunsee County, southeast of Manhattan, Kansas.
Ilis study covered an area of a prominent northwest trending subsurface graben that cross-cuts the NNE trending llumboldt zone.
Eccles (unpublished thesis, 19S0) determined that faulting broke tae surface in Permian rocks over some of the subsurface faults. lie also stat m1 that from airphoto studies, one of the faults appeared to offset undiffer-entiated Quaternary glacio-fluvial deposits, presumably of Kansan age.
I have not confirmed this in the field.
In summary, the youngest surface faulting that we can document is post-Ka ns a n.
Recent movement on an inferred fault near Baileyville may be related to continued glacial rebound.
Sin <erely, al
'.h//K Frank W. Wilson Senior Geologist FWW:ep cc.
W. W. Ilambleton, KGS T. Schmidt, USNRC
- 11. LeFevre, USNRC 5
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