ML18017B268
| ML18017B268 | |
| Person / Time | |
|---|---|
| Site: | Harris  |
| Issue date: | 10/27/1980 |
| From: | Mcduffie M CAROLINA POWER & LIGHT CO. |
| To: | Harold Denton Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML18017B269 | List: |
| References | |
| NUDOCS 8010310393 | |
| Download: ML18017B268 (17) | |
Text
ClÃP-K Carolina Power 8 Light Company October 27, 1980 Mr. Harold 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 FEATURES IN THE MAIN DAM SPILLWAY
Dear Mr. Denton:
The attached report provides a final geologic description of Main Dam Spillway Faults Jl and J2 located between stations 14+47 and 14+57.
The existence of these geologic features has been previously reported to your staff by telephone arid discussed with your staff representat:ive during a site visit (see Table 1 of the attached report).
As discussed in"thereport, these faults, occurred prior to the deformation-mineralization process of 225 million years ago.
Therefore, Carolina Power 6 Light Company concludes that these geologic features cannot be capable faults as defined by Appendix A to 10CFR100.
Yours very truly,
+~78'.
A. McDuffie Senior Vice President Engineering. 6 Construction ONH/dk Attachment cc:
Mr. James P. O'Reilly 80.~.081 0 8.98 411 Fayottoville Street
~ P. 0. Box 1551
~ Raleigh, N. C. 27602 y~o/
/
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SHEARON HARRIS NUCLEAR POWER PLANT UNITS 1, 2, 3, and 4
GEOLOGIC REPORT ON FAULTS J1 and J2
., -The following is a rep'ort""on small Faults J1 and J2 exposed on"the floor of-~
the Main Dam Spillway between Stations 14+47 and 14+57.
These faults were reported to the NRC on October 7, 1980 and Mr. Jack Harris, NRC Geologist, inspected both features on October 9, 1980.
Table 1, "Foundation Features and Faults Discovered to Date" has been revised to show the status of investigations as of October 16, 1980.
Figure 1 shows the location of spillway and core trench.
Fault J1
-Fault J1 is shown on Figure 2 and in Photos 1,
2 and 3. It strikes N27 E
and dips 81 -82o NW.
As shown in Photo 1 and 2, there is about one foot of right lateral strike separation of the two granitic veinlets along the fault.
The fault plane is, in part, filled with quarts and other altered dark minerals and at Station 14+57, 11 feet east of the centerline a 1/2 inch thick granitic veinlet crosses the fault trace without offset.
Fault J2 Fault J2 is shown on Figure 2 and in Photo 4. It strikes N24 E and dips 81 NW.
Trace of the fault extends between Station 14+45 to 14+61.
At Station 14+46, it displaces a granitic veinlet about 1~< inches with 0
right-lateral sense of movement.
It does not off-set a joint which crosses the fault, 12 feet east of the centerline at Station 14+48.
Conclusions The faults described above cannot be"considered capable faults.
The presence of mineralization in the plane of Fault J1, and the cross-cutting relationship of the granitic veinlet indicate that the fault was formed t least 225 million years ago"," as documented in'Attachme'ntf"the CPGL report of October 17, 1978 to the NRC on "Geological Feature at the West Wall of the Main Dam Diversion Conduit".
Fault J2 as crossed by a joint which has not been offset. " Furthermore, Faults J1 and J2 both have small displacements and are very short..
These facts.all 'indicate that both "
faults are ancient'nd can not be considered capable faults as that term is defined by 10 CFR 100, Appendix A.
TABLE 1 MAIN DAN FOUNDATION FEATURES AND FAULTS DISCOVERED TO DATE Feature/Fault Deformational Feature Location Spillway Sta 15+41 Report to N R C Initial Written 12/8/77 "12/15/77 NRC Ins ection 12/14/77'chistose Zone Conduit Sta 2+55 9/19/78 10/17/78 9/19/78 Fault A Fault Group B
Fault C
Fault Group D
Core Trench Sta 3+10 Core Trench Sta 3+10 Core Trench Sta 3+60 Core Trench Sta 3+32 11/9/78 11/16/78 11/16/78 12/1/78
, 11/29/78 11/29/78 1/24/79 1/24/79 12/8/78 12/8/78 12/8/78 12/8/78 Fault A2 Fault A3 Fault A4 Fault E
Fault F Fault G
Fault F2 Core Trench Sta 3+00 Core Trench Wall Sta 3+40 Core Trench Sta 2+87 Core Trench Sta 2+45 Core Trench Sta 2+03 Core Trench Sta 1+97 Core Trench Sta 2+04
'12/8/78 1/19/79 11/16/78 1/26/79 1/26/79 1/30/79 1/30/79 2/2/79 1/24/79 3/30/79 1/24/79 3/30/79 3/30/79 3/30/79 3/30/79 3/30/79 12/8/78 1/30/79 4/11/79 12/8/78 1/30/79 1/30/79 1/30/79 1/30/79 1/30/79 4/ll/79 Gneiss Layer 63 Core Trench
& Schistose Zone 82 Sta 3+60 to 2+90 1/30/79 2/2/79 1/30/79
TABLE 1 (Continued)
MAIN DAM FOUNDATION FEATURES AND FAULTS DISCOVERED TO DATE Feature/Fault
. 'Location Report to N R C--
Initial
Written NRC Ins ection Fault A5 Fault F3 Core Trench Sta 2+23 2/12/79 Diversion 4/10/79 Conduit West Wall Sta 5+48 3/30/79 6/6/79 4/ll/79 4/10/79 Schist Layer Fault F4*
'pillway **
Feature 1
Spillway ***
',Feature 2
F.ul. A, Fault C2 Core Trench Sta ll+52 Spillway Sta ll+90 Spillway Sta ll+59 Spillway Sta 12+02 Core Trench 1+89 Core Trench 1+62 4/18/79 12/20/78 12/20/78 12/20/78 1/29/80 1/35/80 I
6/6/79 3/20/80 3/20/80 3/20/80 3/20/80 3/20/80 4/17/79 5/23/79 1/30/79 2/15/80 1/30/79 2/15/80 1/30/79 2/15/80 2/15/80 2/15/80 Fault F5 Core Trench 1+74 1/31/80 3/20/80 2/15/80 Fault Group G
Core Trench 1+87 1/29/80 3/20/80 2/15/80 Fault G2 Fault G3 Fault H
Fault I Core Trench 1+57 Core Trench 1+57 l
Core Trench 1+85 Core Trench 1+58 1/29/80 1/29/80 1/29/80 1/29/80 3/20/80 3/20/80 3/20/80 3/20/80 2/15/80 2/15/80 2/15/80 2/15/80 Previously
- Previously
+** Previously reported as spillway offset at Sta 12+02 reported as spillway offset at Sta ll+70 reported as spillway offset at Sta 12+10
TABLE 1 (Continued)
MAIN DAM FOUNDATION FEATURES AND FAULTS DISCOVERED TO DATE Feature/Fault Location Report to N R C
~
.i.-:NRC
'nitial Fault J1 Spillway Sta 14+57
~~-" ~~':10/7/80 This'report 1'0/9/80 Fault J2 Spillway Sta 14+48 10/7/80 This report
, 10/9/80
. EXPLANATION
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Granite Homblend~ica gneiss Large quartztfeldspaf pod <~~%+~-
or contact i-I\\-
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Joint, fracture, Vein, dikelet, or mineralized fracture 81 Strike and dip ofjoints r
Strike and dip ofMetamorphic Foliation
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, Fault with relative Iateal movement shown with arrows and dip offaultplane.
Letter
.identifies fault.
SPILLWAY KEY TO PLAN GEOLOGIC MAP NOTE: Allrocks are slightly weathered to fresh 1.
Quartz fillings in Fault J1 2.
Granitic veinlet 5" wide not offset by Fault J1 6
~ 'CALEIN FEET, 10 3.
Granitic veinlats apparently offset 1 foot by Fault J1 4.
Granitic veinlet 1" wide offset 1N" by Fault J2 5.
Joint not offset by Fault J2 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 SPI LLWAYFLOOR EAST SIDE SECTIONS Sta.14+ 45 to 14+ 65 EBASCO SERVICES INCORPORATED NO. DATE REVISION BY CH.
APPROVEU SCALE 1 6'I V.
DR.
CH. ~~iI APPROVED DATE 10116/60 FIGURE 2
PHOTO 1
Fault J1 looking upstream toward Station 14+54. Granite veinlet showing approximately 12 inches of right lateral offset.
No. SHNPP Main Dam 10/20/80-1 10/7/80
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PHOTO 2 Fault J1 looking upstream at Station 14+54.
Close up of granitic veinlet shown in Photo 1 with approximately 12 inches of right lateral offset.
No. SHNPP Main Dam 10/20/80-2 10/7/80
h 0
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1 4
J r
BRUTE t
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PHOTO 4 Fault J2 looking downstream at Station 14+48. Granitic veinlet with approximately 1'/z inch of right lateral offset at point of yellow pencil. Joint parallel to red pencil crosses fault without offset.
No. SHNPP Main Dam 10/20/80-4 10/7/80
0 II ly.
PHOTO 3 Fault J1 looking downstream at Station 14+48. Granitic veinlet /~ inch thick showing approximately 12 inches of right lateral offset.
No. SHNPP Main Dam 10/20/80 3 10/7/80
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