ML20033C994
| ML20033C994 | |
| Person / Time | |
|---|---|
| Site: | Perry  |
| Issue date: | 12/01/1981 |
| From: | Davidson D CLEVELAND ELECTRIC ILLUMINATING CO. |
| To: | Tedesco R Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8112040573 | |
| Download: ML20033C994 (29) | |
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P o. Box 5000 e CLEVELAND, oHlo 44101 e TELEPHONE (216) 622-9800 m (LLUMiN ATING BLOG.
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L c v n in anon Dalwyn R. Davidson vlCE PRESIDENT
-- }f SYSTEM ENGINEERING AND CONSTRUCTION
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December 1, 1981
,94. 9ggS Mr. Robert L. Tedesco Assistant Director for Licensing Division of Licensing 93*
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U. S. Nuclear Regulatory Commission 4
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% w Perry Nuclear Power Plant Docket Nos. 50-M 0; 50-M1 Response to Request for Additional Information -
Geology Cuestions
Dear Mr. Tedesco:
This letter and its attachment is submitted to provide draft responses to the concerns identified in your letter dated November 12, 1981 in regards to Geology Questions.
It is our intention to incorporate these responses in a subsequent amendment to our Final Safety Analysis Report.
Very Truly Yours, Dalwyn i. Davidson Vice 1Yesident System Engineering and Construction DED: nlb Atte.chment cc:
G. Charnoff, Esq.
9jf M. D. Houston D
URC Resident Inspector 5
ti 8112040573 811201 PDR ADOCK 05000440 A
1 231.5 Provide a copy of the personal communication (N.J. Clifford to B. Voight) which addresses the possible association of gravity anomalies with structural control of the Lake Erie shoreline southwest of the Perry Nuclear Power Plant (see page F-60 of Appendix 2D).
Response
The personal communication between B. Voight and M. J. Clifford consisted of ERTS imagery with linears identified by M. J. Clifford and a telephone conversation with regard to their possible structural control. No transcript of the conversation was made.
The linears correspond to a straight-line section of the Lake Erie shoreline southwest of the PNPP site. The communication did not include discussion of any association of the linears with gravity anomalies.
The inference that gravity anomalies and magnetic data support the possibility of offshore faults paral.'eling the shoreline near the PNPP site was made by B. Voight.
(See appendix 2D, page F-60).
A lineament analysis of satellite imagery within a 75-mile radius (exclusive of Canada) has been conducted in response to Question 231.11.
The northeast trending lineaments south of the Lake Erie shoreline are interpreted to be due to lithologic and geomorphic controls unrelated to structure.
The present Lake Erie shoreline does not necessarily reflect structural control considering its history of migration during the Quaternary (e.g. Figure 2.4-37 showing historic migration due to longshore current and wave erosion).
t 231.6 A number of geophysical surveys (magnetic and high resolution seismic) have been conducted on Lake Erie in the vicinity of the Perry Nuclear Power Plant (Hutchinson and Wold, 1979).
(1) Is the resolution of the data sufficient to either negate or verify (a) possible faulting of the Paleozoic section which may be associated with the offshore anomalies identified on Figure 13,
- p. F-68 of FSAR Appendix 2D and-(b) the cooling water tunnel fault (s)?
(2) Elaborate on your responses to (a) and (b) above.
(3) Discuss each of the offshore anomalies (1, 2, 4 through 12, and 14) shown on Figure 13 by providing (a) the reference from which the anomaly has been identified, (b) a discussion which addresses the possibility of the anomaly being fault-controlled and extending into and perhaps through the Paleozoic sectica.
Response
(1) (a)
No.
(1) (b)
No.
(2) (a) The response to NRC Question 230.7 indicates the problem in identifying faulting from the high resolution seismic surveys conducted on Lake Erie in the vicinity of the PNPP Site. The insufficiency of subbottom penetration discussed there is also the case for the remaining portions of Lake Eric included in the survey.
The magnetic surveys sited by Hutchinson and Wold (1979) are discussed in Appendix 29, p. 38.
In general, the resolutien of the surveys (both shipborne and aeromagnetic) was insufficient to give direct evidence of faulting in the Paleozoic section beneath Lake Erie.
Anomalies that were resolved were interpreted to indicate intrusive bodies not extending above the Precambrian basement rock.
The data does not bear on the possibility of the intrusions being fault controlled or, if so, whether the faulting may extend upward into the Paleozoic rocks.
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231.6 (Pg. 2) Cont'd (2) (b) The response to part (2) (a) is directly applicable to cooling water tunnel fault.
(3) (a) All anomalics shown on Figure 13 excepting anomalies 2, 8, 11 and 14 were interpreted by B. Voight.
The gravity anomalies were based by him on Bouguer Anomaly mapping compiled by k'eston Geophysical (see Figures 2.5-10 through 2.5-13).
The magnetic anomalies were interpreted from survey results reported by Ahrens (1975) and Myers (1977).
Anomaly 14, the Cleveland Salt Mine graben, was reported by Jacoby (1970) and Heimlich, et al (1974) and also inspected by L. Schultz and B. Voight in April 1979.
(2) (b) The possibility of anomalies 1, 2, 4-12 being fault controlled is based on analogy with similar gravity anomalies in other regions that have been shown to be fault-related or, in the case of magnetic anomalies, interpreted to be associated with intrusive 4
bodies whose emplacement is commonly structurally controlled.
Anomalies 2 and 8 are discussed by Myers (19/7) as indications of Mesozoic, mafic, intrusive bodies (see Appendix 2D-F, pp. F-48-49).
The possibility of fault control or its extent is problematical as it must be inferred from the presence of intrusive bodies which are, in turn, postulated from non-deterministic geophysical models.
Analogy with other regions is the primary basis for suggesting structural control of the gravity anomalies (or magnetic anomaly 10).
Existing information does not allow the extent of any hypothesized, associated faultiag to be defined.
Historical seismicity, when it can be identified with a known structural feature, can give an indication of the active extent of the feature.
In the present case the distributions and magnitudes of seismic events do not in themselves suggest structural features of the scale of the anomalies noted. Further correlation of any historical seismic event with structural features in northeastern Ohio is high equivocal.
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231.6 (Pg. 3) Cont'd.
With the e~xc6ption of anomaly 14, there is no basis on which to determines the vertical extent of any hypothesized faulting associ-e.,
ated with the geopb sical anomalies.
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' Anomaly 14-is a known fault-bounded graben of northwest trend.
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- The vertical 6ffset is reported as 47 feet. This offset is distributed over a distance of 200 feet or so on the western border and over a wider distance on the east.
'" the opinion of Jacoby, this and other minor faulting in the Salina of the Cleve-land Mine has not ruptured the Devonian Columbus linestone over-lying that mine (FSAP Reference 120).
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231.7 FSAR Figure 2.5-8 (Regional Tectonic Map) depicts a small northeasterly trending high angle fault 8 miles southwest of the Perry site (FSAR Ref. 120). As shown on the figure, this fault is on strike with the cooling water tunnel fault (s).
Present a detailed description (length, strike, dip, throw, etc.)
of the fault southwest of the site, including a discussion of its capability and its relationship, if any, to the cooling water tunnel fault (s).
Response
The fault shown on Figure 2.5-8 is discussed on pages 2.5-67 and 2.5-64.
The fault strikes L'*SE and dips SE at 60.
It was identified only in the production shaft of Morton Salt's, Fairport Harbor Salt mine at a depth of 1,950 feet below ground. Displacement on the fault is approximately 1 foot. The faalt does not extend above the Oriskany sandstone of Middle Devonian age which is overlain by 1,200 feet of unfaulted post Middle Devonian, Paleozoic limestones and shales (FSAR Reference 120).
The fault is therefore considered to be non-capble.
It has no known or inferred relationship to the cooling water tunnel faults.
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231.8 Dr. Barry Voight describes a small, normal fault with eacterly strike in the Fairport Harbor Salt Mine (p. F-64 of FSAR Appendix 2D). The location of this normal fault appears to be coincident with that of the high angle thrust fault described by Tacoby (FSAR Ref. 120) on page 2.5-67 and discussed in NRC Question 231.7 above.
Describe the small normal fault in more detail (length, strike, dip, throw, etc.) and discuss the relationship between Voight's normal fault and Jacoby's high angle thrust fault).
Response
The small, normal fault described by Voight has been reported in the Grand River Access Shaft of the Fairport Harbor Salt Mine (FSAR Reference 121).
The normal fault is one border of a small graben with easterly strike and apparent offsets of up to 1 foot. The graben affects dolomites immediately overlying the First Salt of the Salina Group. The small thrust (reverse) f., ult described by Jacoby offsets approximately 25 feet of the underlying Upper Second Salt and a portion of interver.ing dolomite beds (FSAR Reference 120). There is no evidence that the faults are coincident along strike. They may be related in the sense that faults of this scale are reported to be common at the base of dolomites overlying the First Salt.
Furthermore, it is not unreasonable to expect some degree of rotational movement in solution-induced faulting. Hence, movements of both normal and reverse senses might be expected in associated faults or even on different portions of a single fault.
231.9 k'ere any low angle northwesterly directed thrust f aults encountered in the Perry power block excavation with attitudes similer to the cooling water tunnel faults (s)? Discuss.
Response
Three fundamental structural fabrics, northeasterly, northwesterly, and northerly, can be inferred from the foundation bedrock geologic maps. An excavated thrust fault traversing the southwest quadrant of Reactor 1, a shallow fold traversing Reactor 2 and terminating in the Control Complex, and a very shallow fold traversing the northeast corner of Condensate-Demineralizer 1 are three elements of the northwesterly fabric. A more northerly trending fold traversing the Control Complex, the Radwaste Building and Condensate Demineralizer 1 may signify a conspicuous element of a second fabric. Gentle swells and swales in Reactor 1, portions of the Control Complex, the Radwaste Building and elsewhere north and south of the nuclear island complex have a northeasterly bearing. A small thrust fault, described in response to Question 231.10, has an apparent north-eaterly strike. A southerly sense of overriding motion for the small thrust fault is interpreted from disturbed rock along the inclined fault-plane segment. No northwesterly directed thrust faults were encountered in the Perry sitc onshore foundation excavations.
4
231.10 What are the attitudes and senses of movement of the low angle
'aults shown on Sections B-B' and E-E',
Plate 3 of the
'dendum to the report entitled, " Geological Investigation
' cion of the Perry Nuclear Power Plant Found ations?"
Response
A small beddiri. plane thrust fault along the west wall of the Control Complex occurs approximately 20 feet north of the southwest corner. The fault plane is defined by a thin gouge sheet, less than one-inch thick, of tough, feathery clay containing angular fragments generally no larger than fine gravel. One segment has an inclination of 14 degrees in a southerly direction, but attains horizontality with depth as observed from fault-plane projections onto flat-lying strata from which the thin conformable gouge sheet was removed during excavation to final grade.
It is bounded in an upward vertical projection by a horizon demonstrating horizontality. A northeasterly fault strike is projected on the basis of observed intersections of the fault plane with horizontal grades during excavation. A southerly sense of motion is interpreted from disturbed rock along the inclined fault-plane segment.
The other thrust fault, located along the northern wall of the Radwaste Building, has a more easterly strike and northerly inclination. This structure is bounded vertically by horizontal strata as observed during excavation. A southerly sense of overriding motion is interpreted from disturbed rock along the fault-plane and from drag effects.
231.11 In order to conform with standard Review Plan, Section 2.5.3, please conduct a remote sensing lineament analysis of the area within at least a 5 mile radius of Perry Nuclear Power Plant.
Response
In response to a request for analysis of lineaments in the vicinity of the Perry Nuclear Power Plant, Units 1 & 2, Earth Resources Technology Satellite imagery was examined for evidence of lineaments and patterns indicative of geologic structures within a radius of 75 miles of the site.
Bands 4, 5, and 7 were selected for viewing.
ERTS tran:parencies were studied on a light table and lineaments plotted on an acetate overlay. The observed lineaments were compared to available geologic and surficial geologic maps and data of northeastern Ohio and northwestern Pennsylvania for determination of possible origins. The lineaments (Figure 2.5-175) were designated by numbers which are refert eed to the descriptive and interpretative text that follows.
Lineament Identification The definition of a lineament as used in this report follows O' Leary et al.,
(1976) which states "a lineament is a mappable, simple or composite linear feature of a surface, whose parts are aligned in a rectilinear or slightly curvilinear relationship and which differs distinctly from the patterns of adjacent features and presumably reflects a subsurface phenonmenon".
Lineaments were found to correspond to cultural, topographic, geomorphologic, and geologic features. These included the following specific examples:
roads, power lines, vegetation (agricultural), stream valleys, abandoned shorelines, buried stream valleys (associated surficial deposits), lithologic contacts, joints, fold axes, faults and structural discontinuities (Wagner,Lytle Lines, described as " narrow zones or trends along which fold axes terminate, diminish or change direction", Wagner and Lytle (1976)).
The area of investigation includes portions of the Appalachian Plateau Province to tae southeast and the Central Lowland Province to the northwest.
Low amplitude northeastward trending folds die out in northwestern
231.11 (Page 2) Cont'd Pennsylvania at the limit of the area affected by the Alleghenian Orogeny to the southeast. Faulting associated with the strong compression in southeastern Pennsylvania also is not evident at the northwestern limits of the plateau.
Northwestward trending Wagner-Lytle Lines which may indicate faulting at depth perpendicular to fold axes in west-central Pennsylvania also die out to the northwest.
Three major folds in southeastern Ohio, the Cambridge and Burning Springs anticlines, and the Parkersburg-Lorain syncline trend N 10 W becoming broad low-amplitude folds to the north. These folds may be due to syn-depositional deformation associated with basin arching to the west or later Alleghenian compression from the southeast. Smaller scale northwestward trending folds are also mapped south of the study area.
Subsurface information indicates northwestward trending structures which are of limited extent and are reported to be high angle normal faults (Stone & Febster, 1978).
Possible explanations for the origin of these folds and faults include weak Alleghenian tectonism, basin arching, differential compaction, and syn-depositional deformation.
Lineament No. I a
Lineament Number 1 is a discontinuous tonal variation trending northeastward for approximately 50 miles from a point 16 miles south of Cleveland to 16 miles southeast of Perry. This lineament corresponds to the contact between isolated upland remnants of Pennsylvanian sandstone, shale, and limestone (Pottsville and Allegheny), and underlying Mississippian shale, sandstone, and limestone (Waverly and Maxville).
Segments of Trumbell Creek, Milk Creek and the northeastern branch of the Chagrin River, generally parallel to the regional strike and lithologic contacts, are responsible for the linear tonal variation (Ohio Edison Co. PSAR, 1977).
Lineament No. 2
'ineament No. 2 traces a sinuous path along a generally northeastward trend trom a point 16 miles east of Cleveland to 20 miles southeast of Perry. The tonal change occurs as a dark band of variable width.
This lineament
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231.11 (Page 3) Cont'd corresponds to stream channel sections of the Chagrin, Big, and Grand drainages which cut through the Mississipian age Waverly and Maxville, sandstone, shale, and limestone into the underlying Devonian age Olentangy and Ohio shales.
Lineament No. 3 Lineament No. 3 parallels an east-west trending, meandering segment of the Grand River. The darker-toned floodplain is composed of Wisconsin age alluvium. The Wisconsin age Lake Border moraine controls the linear segments of the drainage in this area (Goldthwait, 1967).
Lineaments No. 4 and 5 Lineaments No. 4 and 5 striking northeastward parallel to the Lake Erie shoreline east of Perry, Ohio, are based on slight tonal variations and the alignment of stream channels. The abandoned shorelines of Wisconsin age Lake Warren correspond with these lineaments (Goldthwait, 1967).
Lineament No. 6 Lineament No. 6 occurs as a light-toned, curved lineament extending from Meadville, Pennsylvania northwestward along Cussewago Creek, and northwestward to westward along Connecticut Creek into Ohio. The northwestward trending lineament parallels a segment of the Cussewago Creek that cuts Pocono Group conglomerates and sandstones down to the Oswayo Formation shales, siltstones, and sandstones, forming steep valley walls with dark tones.
Control of stream valleys may be due to the orientation of synclinal and anticlinal axes.
Lineament No. 7 Lineament No. 7 trends northwestward, parallel to a segment of Muddy Creek, and is likely of the same origin as Lineament No. 6.
231.11 (Page 4) Cont'd i
Lineament No. 8 Lineament No. 8 extends northwestward from the upper Shenango River through Pymatuning Reservoir to Geneva on the Lake. The discontinuous lineament occurs as a faint light tone which does not coincide with topographic alignments. This lineament possibly connects southeastward with an area of structural discontinuities (Wagner-Lytle lines).
Briggs and Kohl (1976) report that no surface faulting has been recognized along the lines, which suggests that deformation took place in broad zones over long periods of time during which the rocks were able to adjust to stress with many minor fractures rather than mappable faults.
Lineament No. 10 1
Arcuate lineament No. 10 was mapped along a section of Crooked Creek extending from Greenville northward and northwestward to Pymatuning Reservoir. The tonal variation is likely due to Wisconsin age kame deposits and recent alluvium filling the valley. The valley is probably structurally controlled.
The Shenango River drainage parallels the general strike of the limits of the Pottsville Group sandstones and conglomerates in the area.
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Lineament No. 11 Lineament No. 11 is drawn from a discontinuous, dark-toned line which extends northwestward from Mercer, Pennsylvania into Ohio. This lineament appears to connect to the southeast with an area of structural discontinuities (Wagner-Lytle lines) described in Lineament No. 8.
Lineament No. 12 l
Lineament No. 12 is a discontinuous, light tonal-variation which extends from south of Ravenna along a section of the West Branch of the Mahoning River, i
northeastward to south of Pymatuning Reservoir.
The southwestern segments correspond to a buried river valley filled with alluvium and Wisconsin age
" valley train" deposits (Cummins, 1959). The middle and northeastern segments i
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231.11 (Page 5) Cont'd appear to correspond to the strike of lithologic contacts between the upland Sharon Conglomerate /Connoquessing sandstone and the lower Cuyahoga Group shales in the valleys.
Lineaments No. 13, 14, 15, and 18 These lineaments are the stronger of many generally north-northeast trending lineaments forming one axis of a rectilinear pattern in northeastern Ohio, formed by regular variations in forest cover.
In one case, (Lineament No.
15), the vegetative lineament corresponds with a finger of Wisconsin age lacustrine deposits filling the buried Grand River valley. The regular rectilinear pattern is likely due to the type of agriculture present in this area. This pattern is abruptly terminated at the Pennsylvania border to the east.
Lineament No. 16 Lineament No. 16 is pletted on a weak, discontinuous tonal-pattern, darker on the northeast end, light in the center, and parallel to the drainage of the Cuyahoga River on the southwest end.
This lineament cuts across lithologic contacts. The more distinct sections coincide with linear glacial outwash deposits (valley trains) preserved as terraces in the Cuyahoga River valley.
The northeastern section parallels an end moraine depoeit south of Ashtabula.
Lineament No. 17 Lineament No. 17 trends northeastward, parallel to the Upper Cuyahoga River.
The drainage cuts Wisconsin age lacustrian deposits filling a buried river valley.
The valley is probably controlled by the strike of lithologic contacts in this area, and cuts through upland Pottsville and Allegheny shale, sandstone, and limestone to Waverly and Maxville shale, sandstone, and limestone.
233.11 (Page 6) Cont'd.
Lineament No. 19 This lineament is mapped as a tonal change which parallels part of Eagle Creek and the Grand River.
Sections of end moraine and valley train deposits plus the contact of Pottsville and Allegheny rock units with Waverly and Maxville rock units form the tonal patterns. The axes of synclines or anti-clines could be responsible for preglacial drainage control in this area.
Lineament No. 20 Lineament No. 20 follows an abrupt change from light to dark tone on a short linear section between Warren and Ravenna, where alluvial deposits fill a buried, northeasterly trending, preglacial valley nearly paralleling the West Grande River.
Lineament No. 21 Lineament No. 21 is traceable as a faint, light tonal-variation trending northwestward between Alliance and Akron, Ohio. This lineament corresponds to a N.54 W.
trending high-angle fault mapped in the subsurface. The maximum a
vertical displacement is 100 feet upthrown on the southwest side.
Structural contours and isopachs of the middle Devonian age Delaware-Dayton Formations confirm the existence of the fault first noted by Janssens (1977) and Stone
& Webster (1978). The location and limited extent of this f ault and the lack of any known associated seismicity indicate no potential hazard.
REFERENCES Briggs, R.
P., and Kohl, W. R.,1976, Map Showing Major Fold Axes, Satellite-Imagery Lineaments, Elongate Aeroradioactivity Anomalies, and Lines of Structural Discontinuity, Southwestern Pennsylvania and Vicinity, U.S.G.S.
Miscellaneous Field Studies, Fbp MF-815.
231.11 (Page 7) Cont'd Cummins, J. W.,
1959, Buried River Valleys in Ohio, Ohio Department of Natural Resources, Division of Water, Report No. 10, State of Ohio, Department of Natural Resources, Columbus, Ohio.
Goldthwait, R.
P.,
et. al., 1967, Glacial Map of Ohio, U.S.G.S. Miscellaneous Geologic Investigations, Map I-316.
- Janssens, A.,
1977, Oil and Gas in Ohio Past, Present, and Future, in Janssens, (ed.), Seminar on Industrial Self-Help Programs for Natural Gas Supplies, Nov. 29, 1976: Ohio Dept. Nat'. Resources, Div. Geol. Survey Special Pub., p. 3-25.
O' Lea ry, D. W., Friedman, J. D., and Pohn, H. A., 1976, Lineament, Linear, Lineation: Some Proposed New Standards for Old Terms: Geological Society of America Bulletin, v. 37, p. 1463-1469.
Ohio Edison Company PSAR, Response to Question 361.18 (2.5.4.3) Am. 4 (07 77).
Stone & Webster Eng. Corp.,1978, New York and Ohio: Geology of Bedded Salt and Program Plan, Volume III.
Wagner, W.
R.,
and Lytle, W.S., 1976, Revised Surface Structure Map of Greater Pittsburgh Area and its Relationship to Oil and Gas Fields:
Pennsylvania Geological Survey, 4th ser., Inf. Cire. 80.
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yi PERRY NUCLEAR POWER PLANT ANp p; THE CLEVELAND ELECTRIC ILLUMINATING COMPANY Remote Sensing Lineament Analysis i
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231.12 Present a summary of your geological and seismological efforts relative to updating of the PSAR.
Response
The following table summarizes the chronological order of geoscience activities correlated to updating the PSAR:
Activity Date Renarks Foundation Mapping Program August 1975-Fall 1977 Investigations:
Onshore September 1975-March For details see Deformation Exposed by Plant 1976 (mapping Section 2.5.4.3.6.2 Excavations continued)
Tunnel Mapping Program August 1977-September 1978 Investigations:
Offshore April 1978-May 1979 For details see Section Deformation Exposed by Tunneling 2.5.4.3.6.3 and App. 2D Updated Seismicity Analysis September 1981 See resoonse to Q230.3 submitted on Oct. 30, 1981 Prepared Site Specific Response September 1981 See response to Q230.6 Spectrum submitted on Oct. 30, 1981 Conducted Satellite Imagery September 1981 See response to Q231.11 Lineament Analysis Performed Geological and October 1981 Geophysical Literature Research
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231.13 Provide copies of the personal (1978) and written (1979) communication (FSAR References 156 and 157) with Mr. S. J. Williams of the Coastal Engineering Research Center relative to Department of the. Army seismic track lines in the vicinity of the cooling water tunnel fault (s) (See FSAR page 2.5-110).
Response
Reference 157 is provided as Attachment 231.13A.
Reference 156 is not available at this time.
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CEPARTMENT OF Tile ARMY enA rA1.t scir :.:nmc nescancH ccnrcn g
{R:QfA*G mn':us.n cun.oina g.;;4)j rent rca voin,vmcima anss v 31.13A Page 1 of 2 CEREN-GE 30 January 1979 RECEIVED pr bcn'rP'l #
SEP 1 8 kudl -
m-lir. Lane Schultz Gilbert Associates i.,
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Reading. FA 19603 l
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Dear Lane :
I'n writing in response to your telephone call on Wednesday the 24th with questions about the nearshore geology of Lake Erie near the Ferry, OH
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. nuclear pcwer plant.
I found the Da es and Mcore report on the Cleveland Airport feasibility study after I spoke with you and I ar. inclosing a Xerox of the cover. Ity copy is a second draf t with a liarch 1974 date, and I have no idea if r. ore recent work is available, but I think that iial y,
Palmer could give you further details. Also, ycu uill find a rap of the Uashington area with an insert showing the location of the King: an 1
Building where CERC is located.
I thirk you will find it adequate for f!
visiting our facility but if you get lost, give re a call.
The third inclosure is a series of naps shewing the ccrplete ccverage of l
7 data extending frcn Erie, FA west to Tolede, CH that were collected by
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CERC during the past two sun:.ers.
The seisnic dsta consist of so-e 539 l
t v.iles (852 km) of 300 jcule Uniboca high resolution seismic reflection c4 profiles, and a total of 107 vibratory ccres were taken that are a L
reaxirnra of 20 feet (6.1 m) long.
In answer to your inquiry I exanined i
the seismic profiles fro:1 navigation fix 610 to Go on the third page, 1
-l which I think is in the vicinity of the Ferry power plant. The records
.l-l don't exhibit enough subbottcn penetration into the shale bedrock to N.
expose fault features,but I didn't see abrupt elevation chanc2s in the i
i lake floor or acoustic contrasts af the 5ediments to suggest tnat faults are present.
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4 231.14 Revise or otherwise amend Table 3, page F-69, FSAR Appendix 2D to include citations from which the on-shore anomalies (3, 4, 12,13,14,15,17, and 19) shown on Figure 13 (page F-68 of Appendix 2D) were derived. Present the bases for defining each of the oil-gas drilling anomalies including the fault length, identification of the offset horizons, and identification of the uppermost horizon not af fected by the possible faulting.
Response
Explanatory Notes (Addendum to Appendix 2D-F Table 3)
Anomaly Source 3
Interpreted by B. Voight from Figures 2.5-10 through 2.5-13.
4 Interpreted by B. Voight from Figures 2.5-10 through 2.5-13.
12 Interpreted by B. Voight from Figures 2.5-10 through 2.5-13.
13 Interpreted by B. Voight based on personal communication with A.Janssens (forcerly of the Ohio State Geological Survey) and also Figures 2.5-10 through 2.5-13, and 2.5-38.
14 Identified during inspection of the Cleveland Salt Mine access shaft.
15 Interpreted by B. Voight based on personal communication with A. Janssens and Figure 2.5-38.
17 Interpreted by B. Voight from Figures 2.5-10 through 2.5-13.
19 Interpreted by B. Voight from Figures 2.5-10 through 2.5-13.
Oil and Gas Drilling Anomaly 13 corresponds to the narthern boundary to the Ashtabula County " nose" interpreted as a block uplift by B. Voight.
Structural relief of this feature may be 50-75 feet.
It has been identified primarily on the basis of structure contours of Silurian rock units, particularly the Packer Shell Formation. Vertical extrapolation to basement is speculative due to insufficient subsurface data.
Faulting has not been reported in association with this structural " nose."
With existing data it is difficult to speculate on the extent of any hypothesized faulting in connection with this structure.
231.14 (Pg. 2) Cont'd Anomaly 15, as interpreted by B. Voight, corresponds to systematic variations in structure contour trends variously interpreted as small-scale folds, faults, or structural terraces.
(FSAR Reference 118, Voight (Appendix 2D-F,
- p. F-63), and FSAR Reference 5). These features trend northwesterly, with lengths of up to 10 miles and extend through Portage, Mahoning and Columbiana Counties, Ohio. The affected rock units occur above the Middle-Devonian Delaware Formation.
In the Bedford Shale, at the base of the Mississippian Shale sequences, Hoover describes these features as low amplitude structural terraces whose relationship is more allied with the depositional history of the shale sequence than with any tectonic origin.
(FSAR Reference 5).
Apparently the effects of these structural features are attentuated vertically above the Devonian.
231.15 Construct a northwesterly-trending cross-section(s) through borings TX 8, 9 and 10 showing the relationships of the borings to the southwestward projection of the planes of the intake and discharge tunnel faults.(see Figure 12, Appendix 2D).
Designate the intervals in borings TX-8 and TX-10 originally suspected by the drilling inspector as being fault-controlled.
Present your arguments defending why these affected intervals should not be considered of fault origin.
Response
Attached Figure 231.15 shows projected fault planes for several hypothesized attitudes. These projections occur below the bott:m alevation of borings TX-8, 9, and 10.
The affected intervals for borings TX-8 and 10, per drilling inspector designation, are labelled.
Extrapolation of a line connecting these affected intervals to boring TX-9 also is shown.
Boring intervals in TX-8 and 10, initially considered candidate tunnel fault plane intersections by the drilling inspector were subsequently rejected by the same drilling inspector (a geologist) on the basis of geological and geophysical data. The data sets follow: drilling events such as drill rod vibration conditions and drilling fluid coloration, rock core geological logs and downhole geophysical logs (gamma and velocity). This interpretation was supported by the independent review of the same data sets by other geologists (B. Voight, L. Schultz and others).
It should also be noted that extrapolation of the affected TX-8 and 10 boring intervals onto boring TX-9 is not supported on the basis of any data. 31.15 is an account prepared by the geologist who inspected the drilling of all TX-series borings, logged the core and prepared interpretations.
i.. 31.15
(
Page 1 of 2
'memDrandum Gilbert / Commonwealth November 25, 1981 to: W. J. Santamour from: R. T. Wardrop, Geologist subject: Comments on drill logs TX-8, 9, and 10, Perry Nuclear Power Plant.
As.you recall, I was the inspecting geologist on all of the Cooling Water Tunnel fault investigation borings (TX-Series) at the Perry site.
TX-8, 9, and 10 were intended to define the lateral extent of the fault southwest of the tunnel exposures.
Initial mapping at the fault exposures revealed a low angle thrust trending N 47 E with a dip of 17 S.
The first TX series borings (TX-1 through 6) advanced f rom the invert of the Intake Tunnel confirmed the approximate dip of 17 S.
A projection of the fault plane was cade, assuming consistent geometry, southwest to the shore of Lake Erie. This projection was used to locate TX-8, 9, and 10 on the beach west of the site. Using the projection we anticipated intersecting the fault at relatively shallow depths, within 80 f eet of the beach surface elevation. The holes were located and drilled in November and December of 1978. A more detailed mapping program was performed on the tunnel fault exposures in February of 1979.
The motc detailed mapping, (l" = l' scale), performed by Weston Geophysical Corporation, revealed a fault trend of approximately N 51 E.
This more easterly trend, in conjunction with the original estimation on dip 16-17 S would place the fault below the terminal depths of TX-8, 9, and 10.
Additionally, geophysical logging of TX-8, 9, and 10 did not recognize a disturbed zone in any of these borings.
The term " suspected fault" used to describe the 65.85 feet to 66.7 feet interval in TX-8 was used because several of the indicators logged on previous TX series borings were present in the interval. Unfortunately, the indicators can also be caused by excessive vibration in the drill stem and/or poor driller performance.
The all terrain vehicle (ATV) mounted drill rig used to advance TX-8, 9, and 10 from the beach, experienced more vibration during drilling than either the A-frame mounted rig (used for the in-tunnel borings, TX-1 through 6) or truck mounted rigs (used for other surface borings, TX-7, 11, and 12).
Increased vibration i
in the drill stem can cause samples to fracture, create core loss, pulverize samples to clay, etc...
This phenomencn is enhanced by clay partings in shale, a condition frequently encountered at shallow depths at the site due to weathering.
In essence, the same broken rock, clay remnants, and loss of core as fault indicators could have been generated by a less efficient drill set-up.
The release of gas experienced upon extracting the barrel from the " suspected fault" interval was a common phenomenon. Random natural gas releases occurred at the completion of runs in both competent and incompetent rock at various depths throughout the TX series program. The greatest quantities, however, I
did seem to occur in the vicinity of the fault zone.
348 35 12/75
I
- 1.. ~,
4 31.15 j
q.
Mcmo to W. J. Santamo,yr Page 2 of 2 From R. T. Wardrop Comments on drill logs TX-8, 9 and 10, Perry Nuclear Power Plant IGI November 25, 1981 Page 2 Originally it was thought that the intersection of TX-8 with the fault plane at a depth of 66 feet was consistent with projected fault plane geometry, based upon initial tunnel mapping. This made a stronger argument for identifying a fault in the core of TX-8 from the 65.85 feet to 66.7 feet interval in question.
It should be noted that, in light of Weston's more detailed mapping, the fault trend changed and any bias for identifying the fault based upon the initial mapping should be discounted.
No zone of disturbed rock or suspected faulting was identified in TX-9.
Geophysical logging confirmed this. The location of TX-9, in proximity to TX-8 should have allowed TX-9 to intersect the fault trending NE had it actually been present in TX-8.
As stated above it was not present.
The description of a "possible fault" in the 63.5 feet to 64.9 feet interval is inconsistent with either the original N 47 E trend or the subsequent N 51 E trend. The indicators for fault identification found in TX-8 were also presen' in TX-10.
Again, these indicators cculd have been generated by the inferior rig set-up.
In addition, the driller from Herron Testing who had advanced TX-1 through 9 was not available for TX-10.
The new driller was less competent as indicated by comments in my log of TX-10.
The term " overturned" used to describe a piece of core does not refer to overturned laminae or bedding, but describes a piece of rounded core which has been rolled or turned over a number of times in the barrel during coring.
In conclusion, fault plane orientation defined by detailed m'apping of tunnel exposures and previous TX series borings, makes it unlikely that TX-8, 9, or 10 were deep enough to encounter the fault exposed in the Cooling Water Tunnels at the site. Geophysical logging of all three borings did not recognize a zone of disturbance in any of the borings. Unsubstantiated bias, based upon less accurate mapping gave a stronger case for identifying a fault in TX-8 than was warranted. Disturbed zones could have been generated by excessive vibration in the drill stem of the ATV mounted rig used for boring on the beach.
If the fault was encountered in TX-8, it should have also been present in TX-9.
For these reasons it is unlikely that the intervals described as " suspected fault" in the log of TX-8 and "possible fault" in TX-10, represent the plane of the fault projected from exposures in the Cooling Water Tunnels at the site.
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