ML18017A535
| ML18017A535 | |
| Person / Time | |
|---|---|
| Site: | Harris  |
| Issue date: | 06/06/1979 |
| From: | Mcduffie M CAROLINA POWER & LIGHT CO. |
| To: | Harold Denton Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 7906120428 | |
| Download: ML18017A535 (24) | |
Text
REGULATOR~NFORMATION DISTRIBUTION S EM (RIDS)
ACCESSION NBR i 790612'0028 DOC, DATE! 79/Ob/Ob NOTARIZED> No FACIL:50-000 Shearon Har ris Nucl ear Power Pl ant~
Uni t ir Ca'r ol ina 50 401 Shearon Harris Nucl ear Power Pl anti On'it 2i Car ol ina 50"002 Shearon Harris Nuclear Power Plantq Unit 3r Carolina AUTH~ NAME AVTHOR AFFILIATION MCDUFFIEiM,A, Carolina Power 8 Light Co, RECIP,NAME RECIPIENT AFFILIATION DENTONpH,RE Office of Nuclear Reactor Regulation DOCKET 05000400 05000001 05000002 RECIPIENT ID'ODE/NAME.'D Hoor~
LA 5pg~Z
SUBJECT:
Forwards geologic rept on Fault F3. shist layer at Station fit52 at Main Dam<Feature is not a fault or capable fault as defined pet-ioCFR100<App A,Oversize diagrams encl, DISTRIBUTION CODE>>
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CÃQ0 Carolina Power & Light Company June 6, 1979 Mr. Harold R. Denton, Director Office of Nuclear Reactor Regulation United States Nuclear Regulatory Commission Washington, D.
C.
20555 SHEARON HARRIS NUCLEAR POWER PLANT, UNIT NOS. 1, 2, 3, AND 4 DOCKET NOS.
50-400$
50-401, 50-402, AND 50-403 GEOLOGIC REPORT ON FAULT F3 AND SCHIST LAYER AT STATION 11+52 AT THE'MAIN-DAM
Dear Mr. Denton:
The attached report provides a final geologic description of Fault F3 located in the'est wall of the Main Dam Diversion Conduit at Station 5+48 and a schist layer't the'ain dam core trench Stat:ion ll+52.,'he'chist layer was preliminarily reported as a "fault" pending additional study.
The existence 'of these geologic features'as been previously. reported to your staff by"'elephone and by discussions with your staff representatives during site visits.
As discussed in the report, these geologic features occurred prior to the deformation-mineraliza'tion process of 225, million years ago.
Therefore,'arolina Power
& Light Company concludes that these geologic features" cannot be capable faults as defined in Appendix A to 10CFR100.
Yours very truly, M. A. McDuffie Senior Vice President Engineering and Construction SDF/tl cc:
Mr. James P. O'Reilly 906>>0 f3o~ I 98 QOl'c,'. (Pc'/we'~
To gg~ Fit~
411 Fayottevilte Street o P. 0. Box 1551 o Raleigh, N. C. 27602
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SHEARON HARRIS NUCLEAR POWER PLANT UNITS 1, 2, 3 and 4
GEOLOGIC REPORT ON FAULT F3, AND SCHIST LAYER AT CORE TRENCH STA ll+52 k
P The following is a report on small Fault F3 exposed in the west wall of the Main Dam Diversion Conduit at Station 5 + 48 and of a schist layer at core trench Station 11 + 52.
Fault F3 was reported to the NRC on April 10.;<1979,;;,
the schist layer, on April 18,
- 1979, as a "fault", pending additional study and submission of the present report.
Mr. Jack Harris, NRC Geologist, has inspected both features.
Table 1, "Foundation Features and Faults Discovered to Date" has been revised to.show the status of investigations as of May 29;
, 1979.
~ Figure 1 shows the location of the conduit and core tr'ench.
FAULT F3 Fault F3 is shown on Figure 2, Plan Geologic Map and West Wall Section of Diversion Conduit and in Photo
- 1. It is oriented N44E 82 NW to 88o SE and
=
shows 5 inches of apparent normal dip-slip separation of a 5-inch-wide aplite
~
vein, as shown at No.
4 on the west wall (Figure 2).
The fault was traced into the Diversion-'Conduit invert (Plan View), where it crosses, with no
- offset, two east-west trending joints (No.
16) and a northwest-trending fracture zone and schist layer (No.
18)..
Fault F3 terminates in the invert at a northwest-trending joint (No. 20) one foot north of the Diversion Conduit centerline at Station 5 + 50.
Thus, Fault F3 does not offset.and is older than the several fractures, joints, and a schist layer it crosses.
The schist layer at No.
18 must predate the last deformation-mineralization
- event, documented to have occurred more than 225 million years ago, in Attachment B of the CP&L report of October 17, 1978, to the NRC on "Geological Feature at the West Wall of Main Dam Diversion Conduit."
Therefore, Fault F3 cannot be a capable fault as defined in Appendix A to 10 CFR 100:
SCHIST LAYER AT CORE TRENCH STA 11 + 52 During'apping of the core trench on the left (east) abutment of the Main Darn
" (Figure 1), an apparent offset of two quartz veins along a" gently dipping, 1
to 2-inch-thick schist layer was'noted.
This apparent offset (Photo 2), located approximately at Station 11 + 52, 17.5 ft. upstream from the centerline, affects
'wo quartz veins.
At the schist layer (Figure 3, No. 1), one is 5 inches wide (No.'2) and the other, 14 inches wide (No. 3).
This feature has now been studied in detail.
This document reports on the results of this study.
A few feet northeast of the quartz veins, this schist layer is cut by a small body of what appears to be 'granitic pegmatite (No. 10); there, is some suggestion that the pegmatite cuts the hinge'of a recumbent isoclinal f'old.
To the south-
- west, as shown on Figure 3, the single sciolist'ayer divides into two thin layers, each 1/4 to 1 inch thick.
Both of these layers thicken to the southwest and are
.folded into subhorizontal isoclinal folds.
~ >$ g I ( $ lf
-J
The closure of the uppermost of the two layers is shown on Figure 3 in the area of Station ll + 31, 26 feet upstream from centerline.,
The closure of the other layer is almost 50 ft. to the southwest and is not shown on the map."
A number of schist layers, including Number 5 on Figure 3, have been observed.
They are complexly folded, foliation generally paralleling the layering.
The layers are thickest in the hinge of the folds and thin greatly in the limbs.
Only a few 'quartz veins cross these schist layers, however, joints in the granite may cut across the entire layer with no offset (No. 6),
may die out within the schist, or may stop, at the contact within the schist.
The schist layers exposed in the left abutment, including the"one reported as a possible fault, are similar to those discussed in the CP&L report to th'e NRC
'f October 17, 1978, "Geological Feature at the West Wall of Hain Dam Diversion Conduit".
The fact that the foliation is parallel to the boundaries of the
- schist, even within the n'oses of.the folds, shows that the schist layers are actually the limbs of an earlier generation of isoclinal'folds.
These limbs,
- then, have been refolded by a later generation of isoclinal folds, such as the one which closes in the area of Station ll + 31, 26 ft. upstream of centerline.
Since these schist layers are commonly cut by joints wh'ich are not offset, and since other quartz veins do not cross these schist layers, it is likely that quartz veins 2 and 3 (Figure 3) are completely separate features and not the same vein which has been offset by a fault.
During the repeated episodes of folding affecting these rocks,'he relatively ductile schist layers, including the one reported as a possible fault, undoubtedly experienced more internal ductile flow and movement than the far more rigid granites.
This ductile flowage of schist is a typical response to deep-seated deformation conditions and is in no way similar to shallow-seated brittle failure which is characteristic of faulting.
There also is evidence demonstrating that this feature is very old.
As shown by the dip and strike symbols on Figure 3, the schist layer and foliation are folded into a very broad, open anticline plunging gently to the west.
The amplitude of this fold is. less than 1 foot, and consequently the fold is visible on the map, except for the change in dip and strike of the foliation as shown in the area just south of quartz veins Nos.
2 and 3.
The granitic pegmatite cuts the schist zone only a few feet fro'm quartz veins 2 and 3.
Finally, three small joints (No. 7, 8, and 9), all cross one contact of the schist layer without any offset, although all die out within the layer.
Photo 3 shows one of these. small joints in the granite that die out within the schist (No. 8).
In conclusion, as discussed in the above-mentioned report of October 17,
- 1978, the last folding and mineralization are older than 225 million years.
The evidence shows that the feature's a folded compositional layer and suggests that quartz veins 2 and 3 were never one and the same.
The feature is thus not a fault.
Even if it were a fault., it is cut by a granitic pegmatite or vein at least 225 million years old, as well as by joints.
The feature is thus not a capable fault as defined in'0 CFR 100, Appendix A.
i v eu l <<y TABLE 1
>Q.IN DAlf FOUNDATION FEATURES AND FAULTS DISCOVERED TO DATE Feature/Fault Deformational Feature Location Spillway Sta 15+41
~
Report to NRC Initial Written 12/8/77 12/15/77 NRC Ins ection 12/14/77 Schistose Zone Fault A
Co'nduit Sta 2+55.
Core Trench Sta 3+10 9/19/78 11/9/78 10'/17/78 11/29/78 9/19/78 12/8/78 Fault Group B
Fault C
Core Trench Sta 3+10 Core Trench Sta 3+60 11/16/78 11/29/78 11/16/78 1/24/79 12/8/78, 12/8/78 Fault Group D
Fault A2 Core Trench Sta 3+32 Core Trench Sta 3+00 12/1/78 12/8/78 1/19/79 1/24/79
- -'1/24/;.7.9; 3/30/79 12/8/78 12/8/78 1/30/79 4/ll/79 Fault A3 Offsets in Spillway Core Trench Wall Sta 3+40 Spillway Sta 11+70 Sta 12+02 Sta 12+10 11/16/78 1/24/79 12/20/78 Pending 12/8/78 1/30/79 1/30/79 Fault A4 Fault E
Core Trench Sta 2+87 Core Trench Sta 2+45 1/26/79 1/26/79 3/3,0/79 3/30/79 1/30/79 1/30/79 Fault 'F Fault G
Core Trench Sta 2+03
>j 'ore Trench Sta. 1+97 1/30/79 3/30/79 1/30/79
'/30/79 1/30/79 1/30/79 Fault F2 Core Trench Sta 2+04'/2/79 3/30/79 4/11/79
TABLE 1 (Continued)
MAIN DAM FOUNDATION FEATURES AID FAULTS DISCOVERED TO DATE Feature/Fault Gneiss Layer 63
& Schistose Zone 82 Location Core Trench Sta 3+60 to 2+90 REPORT TO NRC Initikl Written 1/30/79 2/2/79 NRC Ins ection 1/30/79 Fault A5 Core Trench Sta 2+23 2/12/79 3/30/79 4/11/79 Fault F3 Diversion Conduit 4/10/79 Hest Hall Sta 5+48 This Report:
4/10/79 Schist Layer Core Trench Sta ll+52 4/18/79 This Report 4/17/79 5/23/79
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GEOLOGIC SECTION WEST WALLOF DIVERSION CONDUIT 2-195 P
NA TION 190 185 180 175 170
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'oint, fracture, or contact 5+60 5+50 5+40 CONDUIT STATIONS IN FEET 5+30 Vein, dikelet, ormineralized fracture Q16
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Strike and dip ofjoints FS N48 W Verticaljoint BO P
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Strike and dip ofCompositional layering Projection offracture orjoint Q2 50:
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PLAN GEOLOGIC MAP OF DIVERSION CONDUIT FLOOR 0
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5 10 SCALE IN FEET 20 THIS DOCUMENT IS DELIVERED IN ACCORDANCE WITH AND IS SUBJECT TO THE PROVISIONS OF SECTION X OF THE CONTRACT BETWEEN CARO-LINA POWER
& LIGHT COMPANY AND EBASCO SERVICES INCORPORATED DATED SEPTEMBER 1, 1970, AS AMENDED.
CAROLINAPOWER & LIGHTCOMPANY
, SHEARON HARRIS NUCLEAR POWER PLANT MAINDAM PLAN GEOLOGIC MAP 8c WEST WALL SECTION: OF DIVERSION CONDUIT Sta. 5+30 to 5+60 EBASCO SERVICES INCORPORATED SCALE 1" 10'PPROVED DATE 5 1 I 7'I DATE REVISION BY CH.
APPROVED FIGURE 2
KEY TO GEOLOGIC PLAN8 SECTION MAP 20.
21.
1.
Quartz-feldspar pod.
2.
Fine-grained white aplite vein 5 inches wide.
3.
Fault F3 N44E 82 NW-88 SE.
4.
5 inches of normal dip<lip separation of an aplite vein.
5.
Joint slightly open N20E 52oSE.
6.
Joint slightly open N15E 81oSE.
7.
Joint slightly open N20E 87 SE.
8.
Joint closed N30E 54oNW.
9.
Medium-grained pegmatite veins.
10.
Joint closed N30E 60oSE.
11.
Joint closed N35E 50 NW.
12.
Joint open N42E 80oNW.
13.
Joint open N62E 86oNW.
14.
Aplite vein crosses fracture with no offset.
15.
Biotite pod crosses fracture with no offset.
16.
Fault F3 does not offset east-west trending joint.
17.
Northwest-trending fracture zone 6 inches or less in width with no apparent offset.
The zone is reddish. brown, moderately weathered and contains some micacchist.
18.
Fault F3 does not offset northwest-trending fracture zone and mica-schist layer.
19.
Fracture zone 3 to 10 inches wide striking N65W to NBOW and dipping steeply to the northeast.
Contains thin lenses of mica-schist 1 to 2 inches thick.
Fault F3 terminates at a northwest-trending joint.
Quartz pod the quartz is white to light gray, vitreous, and commonly highly fractured.
It often occurs with pink feldsar and has highly weathered wall zones with sulfide mineralization.
Sometimes quartz is also exposed along fractures.
T N
N
+
+
+
+
+
+
+
+
Foliated Granite, slightly vveathered.
very hard to hard.
Sandy Mica Schist, moderately to highly weathered, moderate to lowhardness.
KEY TO PLAN GEOLOGIC MAP
- 1. Schist layer reported as possible fault.
- 2. Quartz vein 5 inches thick.
- 3. Quartz vein 0 14 inches thick.
- 4. Quartz vein truncated at schist layer.
- 5. Folded schist layer.
- 6. Joint crosscutting extension of schist layer reported as potential fault.
- 7. Joint in granite cutting upper contact of schist without offset.
- 8. Joint cutting bottom contact of upper schist layer without offset.
- g. Joint cutting bottom contact of lower schist layer without offset.
- 10. Granite -pegmatite
(?),
medium-grained, weakly foliated.
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(AREA MAPPED ATSMALLERSCALE) 28 11+30 11t40 11+50 STATIONING IN FEET 11+60 11+70
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Quartz, fresh, very hard.
Joint, fracture, orcontact Vein dikelet ormineralized fractuie Hinge ofrecumbentisoclinal fold Strike and dip ofjoints 10 Verticaljoint Strike and dip ofMetamorphic Foliation in Granite 2
Strike and dip ofOther Foliation in Granite 0
10 SCALE IN FEET THIS DOCUMENT IS DELIVERED IN ACCORDANCE WITH AND IS SUBJECT TO THE PROVISIONS OF SECTION X OF THE CONTRACT BETWEEN CARO-LINA POWER 8c LIGHT COMPANY AND EBASCO SERVICES INCORPORATED DATED SEPTEMBER 1, 1970, AS AMENDED.
intersection ofCore Trench invert 8'r i%all
/
CAROLINAPOWER & LIGHTCOMPANY
- SHEARON HARRIS NUCLEAR POWER PLANT MAINDAM PLAN GEOLOGIC MAP: NORTHWEST SIDE OF CORE TRENCH Sta. 1'I.+ 28 to 11+ 70 EBASCO SERVICES INCORPORATED SCALE 1" % 5'PPROVED DATE 5 ZI 79 DATE REVISION BY CH.
APPROVED DIV.
CH.
FIGURE 3
Contact betweNI schist lndunderlying granite A~lpgnlloint cr otal ~
lr C/,J
,/
I 0
- 1 PHOTO 3 MAINDAMCORE TRENCH Joint crossing schist-granite contact at Station 11+4S, 'l8 feet upstream ofcenterline, view 86.
No. SHNPP Main Dam 5/79M 4/23@8
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Control of DocuNBC'EGULATGHY DOGKH ALE
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Fold Nose,
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- ," schist lay'er without offsets Mica Pchist Layer Mica Schist Layer l
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Fold Nose
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, r, r,c PHOTO 2 MAINDAlN CORE TRENCH Schist layer at Station 81+52, 18 feet upstream of centerline, view NNt.
No. SHNPP Main Darn Bf/9-2
,go~l~o~l<o~l<~>
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PHOTO 1
View south of core trench at Station 3+10.
Fault A offsets vein (behind hat of geologist with board) and offsets dikelet at center of photo near en echelon faults B, Note NW fracture between vein and dikelet, which is not offset.
No. SHNPP Main Dam 11/781 11/10/78
0 E
k III
AUX. DAM SPILLWAY~
~
AUX. DAM I
I I
I I
I I
I I
I CHANNEL
'~ SEPARATING DIKE
/
/
CORE TRENCH O
(
cL O
MAINDAM CONDUIT MAINIRESERVOIR I Noitnal Pool Elevation 220.0'
'I'n1 I pcE EMERGENCY SERVICE WATER INTAKE CHANNEL COOLING TOWERS 0
0 0
0 E
RGENCY SER CE WATER DISCHA GE CHANNEL PLANT COOLING TOWERS COOLING TOWER MAKEUP WATER INTAKE CHANNEL Eo DIE C
/taoi, TI orII SCALE IN FEET CAROLINAPOWER 5 LIGHT SHEARON HARRIS NUCLEAR POWER PLANT Po EBASCO SERVICES INCORPORATED LOCATION OF MAINDAM CORE TRENCH FIGURE 1