ML20065A933
| ML20065A933 | |
| Person / Time | |
|---|---|
| Site: | Millstone  |
| Issue date: | 08/31/1982 |
| From: | NORTHEAST NUCLEAR ENERGY CO. |
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| NUDOCS 8209140179 | |
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{{#Wiki_filter:) rx m REPORT ON FAULTS AND SOIL FEATURES MAPPED IN THE DISCHARGE TUNNEL EXCAVATION MILLSTONE UNIT 3 I AUGUST 1982 l A)
] MILLSTONE NUCLEAR POWER STATION - UNIT 3 DOCKET NO. 50-423 8209140179 820908 PDR ADOCK 05000423 A PDR
REPORT ON FAULTS AND SOIL FEATURES MAPPED IN THE DISCHARGE h v TUNNEL EXCAVATION, MILLSTONE UNIT 3 Introduction Recent excavations for the Circulating Water Discharge Tunnel at Millstone Unit 3 exposed two fault zones on the floor and wall excavations of the cut and cover structure (Figures 1-4). Detailed investigations were undertaken to determine the seismic capability of the features. The faults were found to be similar in orientation and character to other faults previously mapped at the Millstone 3 site and are probably genetically related to them. The results of our investigation indicate that these faults are incapable as defined by 10CFR Part 100. The evidence for this conclusion is presented below. Fault 2781 The first fault encountered, numbered 2781, showed 2.5 in of reverse offset A of a biotite-rich seam near the base of the north wall and 1.5 in. of apparent (v) right lateral offset of a pegmatite vein on the floor. The fault trends N07W and dips 45 to the W. Slickensides on the fault surface indicate movement directly up dip for the hanging wall. The fault zone is relatively narrow (0-4 in) with minor clay gouge and fractured rock. A sample of clay gouge was collected for radiomet ric age dating analysis but proved to contain insuf fi-cient illite for age determination. The clay analysis is included as Appendix A. Unconsolidated soil deposits overlying exposures of the fault on the walls of the tunnel were examined and mapped. (See Figures 5, 6, and 7). Basal till was seen to overlie the fault directly and continuously with no offset, nor disruption of crude layering in the overlying ablation flow-till. Similarly, horizontally stratified outwash deposits were found to be continuous across the projection of the fault on the south wall and had no offsets of any kind (Figure 7). The evidence indicates tectonic movement prior to the last advance of ice about 15,000 to 18,000 yr. BP (Black, 1982 Appendix B; / v)
\
Caldwell, 1978). BX212179-1
O Apparent shearing or drag of sandy layers in the ablation till adjacent to the glacially striated bedrock high on the north side of the tunnel is attributed to slumping and flow of till during deglaciation, the movement direction indicating gravitational sliding off the bedrock high (Black, 1982, Appendix B). Fault Zone 2817-2819 The second fault zone uncovered is larger and more complex than the first and includes faults numbered 2817, 2818, and 2819. (See Figures 1, 3, 4, and 8). The zone strikes between N10-17E and dips 77-82 degrees NW. Measurable left and right lateral offset of pegmatite veins occurs along faults 2817 and 2818 to a maximum of 2.5 ft. Greater displacement is evident on 2819 as no continuity of structures could be identified across the fault in the width of the excavation. The 1.0 in to 1.5 ft wide zone is characterized as containing fractured rock, clay gouge, and drusy secondary quartz with heavy iron stain- , ing in some areas. Quartz crystals are found growing into the zone from most fault surfaces and may entirely enclose rock fragments in the zone. Previous studies of quartz crystals from Millstone indicated development at tempera-tures considerably higher than present surface conditions, meaning they are associated with hydrothermal activity. The last episode of hydrothermal activity in this part of New England is believed to be at least Cretaceous in age (NNECo, 1975). A clay gouge sample was taken from the main fault zone for radiometric dating. Separated illite samples produced a K-Ar age of 142 million +6 million years for the material or Late Jurassic time. A copy of the age date analysis is included as Appendix C. This is the youngest reliable date so far determined for the Millstone site and could possibly represent an extension of tectonic activity of Late Triassic - Early Jurassic age. More likely, however, the age is a minimum resulting from argon loss during the hydrothermal activity asso-ciated with the quartz crystal development. The average of all previous gouge dates from the site is 179 million years. BX212179-1
_3_ m
) /
The rock-soil interface above the fault zone has been carefully exposed and documented. (See Figures 9-12) . On the south wall, offsets from 1 in, to 15 in. in the unconsolidated outwash material form a small fault-bound depression directly over fault 2819. Close examination of the till directly overlying the fault revealed synclinal but continuous layering within the till. Identification of the layering is enhanced by sand beds providing avenues for seepage of groundwater; these beds have subsequently been heavily iron stained and cemented (See Figures 9 and 10). The till-outwash contact was mapped above the fault zone and is not offset. The basinal form of the faulted outwash in this area is believed to be the result of melting of a buried ice block with subsequent collapse and slumping of the overlying soil materials into the spaces left by the melting ice (Black, 1982, Appendix B). These features are quite common in glacial ice margin environments and are not of tectonic origin. Spatial correspondence of the soil structures and the bedrock fault is strictly coincidental. O V The rock-soil interface above the north wall is not as well defined due to the more severe weathering and fracturing of the rock in this area. (Figures 11 and 12). No sharp boundary could be drawn where fault material ends and glacial material begins due to the heavy iron staining and abundance of clay from both glacial and tectonic origins. Basal till apparently was not deposited continuously over this area so lack of offset could not be verified. Crude stratification in the overlying flow till is not displaced, however. Rock-outvash Contact at Station 7 + 05 The bedrock surface drops sharply below tunnel grade near Station 7 + 05. From this point southeastward, the tunnel is primarily founded on till. Cursory inspection of the rock-soil contact at this point could possibly be interpreted as a fault contact due to the abrupt truncation of stratified outwash against the large, smooth joint face and the presence of small of fset n Q beds in the outwash sands. BX212179-1
O Closer inspection reveals a glacially striated joint surface overlain with horizontally bedded deposits (except for cross-bedding) with no evidence of drag on any of the beds at the contact. (See Figure 13). The offsets are confined to particular beds, especially cross-bedded zones, and are not throughgoing. If the joint surface is a fault surface, last movement occurred prior to the formation of striations and deposition of the glacial material.
" Pseudo" Ice-Wedge Cast Excavation of the soil-based section of the tunnel uncovered an unusual feature near Station 8 + 15. (See Figure 14 and 15. ) It has been identified as an ice-wedge cast (Flint, 1964, p. 279) or a " pseudo" ice-wedge cast (Black, 1982). An ice-wedge cast is the cast of an ice wedge which has been filled with material which slumps and washes in from soil adjacent to the original opening. The original ice-wedge forms as a frost crack at the surface which gradually deepens and widens as more ice develops in the crack.
; Ice-wedges generally indicate the presence of permafrost during their
~
formation. When the ice melts out as a result of warmer conditions, the hole created fills in with slumped material, creating the ice-wedge cast. A " pseudo" ice-wedge cast can be formed in temperate climates and are formed by plastic flow of clayey material under differential overburden pressures. The displacement or flow of the subsurface clayey material creates a tension crack in overlying granular , material which gradually slumps inward and fills the crack to form a " pseudo" ice-wedge cast. Black (1982) believes the features in Connecticut are of relatively recent origin, are not related to permafrost environments, and are still being formed today. Iron stained layers resulting from former groundwater levels were found to be displaced downward toward the central filled zone of the wedge at Millstone indicating formation after development of static groundwater levels. Whatever the timing of formation, the structure definitely is not of tectonic origin.
~
,m-BX212179-1
-S-O v Other Faults Two additional small faults were also identified in the excavation. Displace-ment was less than 1/2 in. on fault 2899 and about 3 in, on fault 2894.
Displacements on both faults were observed to die out within the excavation. Neither fault had sufficient clay gouge for radiometric age dating. Summary The faults recently identified in the Discharge Tunnel excavation have been thoroughly investigated and documented. On the basis of the observable evidence, we believe that all the faults can be classified as incapable, according to the criteria set forth in 10CFR Part 100.
'Ine faults are similar in orientation and character to other faults previously documented at the Millstone 3 site. The K-Ar age date of clay gouge in fault 2819 of 142 million + 6 million years is compatible with other dates obtained v
for Millstone and falls within the generally accepted time frame of Triassic - Jurassic tectonic activity. This fault zone was also observed to contain undisturbed drusy quartz growths on the fault surfaces. Previous studies of fluid inclusions in fault zone quartz at Millstone suggested elevated temperatures for the quartz growth, conditions which have not been present at least since the Cretaceous. The soil-rock interface above each of the larger faults was investigated in detail and found to be undisturbed. No movement has occurred since deposition of the glacial material between 15,000 and 18,000 years ago. All of the soil faults and disturbed bedding features have been attributed to glacial phenomena of one kind or another. There is no evidence for a tectonic origin for any of the soil structures. O BX212179-1
).
, REFERENCES 1
Black, R.F., 1982, Origin of Pseudo - Ice-Wedge Casts of Connecticut, h j 3 Abstracts with Programs, Geol. Soc. Amer. , vol. 14, No. I and 2, Feb. 1982, p.6. l l Caldwell, D.W., 1974, " Age of Till at Millstone Point Ct.": unpubl. rept. to j Stone & Webster Engr. Corp. incorporated in PSAR for Millstone Nuclear Power ! Station -Unit 3, Amendment 15, Docket No. 50-423. Flint, R.F., 1964, Glacial and Quaternary Geology, John Wiley & Sons, Inc., N.Y., 892 pp. i Northeast Nuclear Energy Co. , 1975, " Geologic Mapping of Bedrock Surface," ] Millstone Nuclear Power Station - Unit 3, Docket No. 50-423. t I l 1 i. 1a i i f i 4 4 i i i i 1 l 1O i i BX212179-1 t
f Dartmouth College HANOVER NEW HAMPSHIRE 03755
~ - - Department of Earth Sciences Fairchikt Sc:ence Center TEL. (603) 646-2373 W
May 28, 1982 Mr. Frank Vetere Stone and Webster Eng. Corp. P.O. Box 2325 Boston, MA 02107
Dear Mr. Vetere:
Samples analyzed by X-ray diffraction under Job No. 12179, P.O. No. E 21015, gave the following results. Sample A contains ordered illite-smectite, %50% illite, randomly interstratified illite-smectite, %20% illite, and a trace of kaolinite. The two major phases are present in about equal amounts based on the areas of dif-fraction maxima between 15 and 17' 2C No trace of feldspar <^x was detected in the diffraction pattern. The sample is suit-
) able for age measurement, and the dried < 2u powder, flocculated with dilute HNO 3, is enclosed.
Sample B contains abundant potash feldspar and plagioclase in the < 2 and < lu fractions. A small amount of smectite and kaolinite is present, and abundant mica is evident. The mica is biotite-phlogopite, based on the very high intensity ratio of I001/I002. The sample appears to be comminuted metamorphic or igneous rock. It is unsuitable for dating fault movements, so no separation of the < 2u f raction was performed. Sample C is essentially pure smectite with minor (a few percent) amounts of ordered illite-smectite (50% illite) and kaolinite. The very small illite content makesit of doubtful utility for age determination. No separation was performed. Diffraction patterns were obtained using a Siemens D-500 Diffractometer equipped with a copper tube and a grap"hite monochrometer. Standardization is based on the 26.66 line from a "Permaquartz" standard run with the same slit array, scanning direction, and time constant as the analytical runs. A check gave 26.64'20. Clay suspensions (s 2 or < 1p) were concentrated by ultra-centrifuge, pipetted onto glass slides, dried at 90'C and analyzed dry. The slides were solvated by ethylene glycol vapor
- .- . - .. _. -._~....-- -_ .. . ..~_ __ . _- . - . . . . ~. -_ - . - . _ . . . .
Mr. Frank Veters May 28, 1982 Page 2 i I
! at 60*C for 24 hrs. and analyzed quickly to eliminate glycol evaporation. Mixed-layered clay interpretations are based i on published work by Reynolds (Reynolds and Hower, 1970) j Reynolds (1980).
i Sincerely,
/ /teh/
I ( R.C. Reynolds, Jr'. Professor of Geology { 4 i i f 1 o e RCR:sf ' l, l l i
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July 13, 1982 x 65 Sawmill Brook Lane Willimantic, CT 06226 Mr. Frank Vetere Lead Geotechnical Engineer Stone & Webster Engineering Corporation 245 Summer Street Boston, MA 02107
Dear Mr. Vetere:
At the telephoned request, June 28, 1982, of John H. Peck, I met with him and Richard Gillespie on July 2, 1982, at Millstone 3. The purpose was to check certain structures in the glacial deposits and soil in the trench excavated for the circulating water discharge tunnel. I was informed that detailed mapping had shown some narrow fault zones with very limited displacement and with clayey gouge whose radiometric age suggested Mesozoic. Underformed quartz veinlets in the gouge ontained fluid inclusions that indicated elevated temperatures during crystallization. The temperature could be explained by considerable depth at time of formation or hydro-thermal activity. Either source of heat, however, also pointed to con-siderable antiquity for the last activity of the bedrock faults. Yet, numerous small fractures, and other structures in the glacial deposits overlying or in the vicinity of the faults, were being suggested by some as possible evidence of post glacial activity of the bedrock faults. If true, they would indicate activity in the last 15,000 years. I examined the glacial deposits and soil for any possible evidence of post glacial tectonic activity and to provide an explanation, if possible, for the small fractures and other structures in those unconsolidated deposits. In summary, I found no evidence of displacements in the glacial deposits and soil which can be related to bedrock fault activity. All the surficial structures seen are typical of normal complex movements occurring in sediments associated with wasting ice and of subsequent dewatering and compaction. These movements involved:
- 1. Water discharge from stagnant ice to all points of the compass,
- 2. Deposition of fluvial, lacustrine, and deltaic strata up to the angle of repose,
- 3. Penecontemporaneous deformation of susceptible beds by slump, flow, slide, creep, dewatering, and loading,
- 4. Depnsition of flow till from ice masses into the strati-fied deposits with accompanying deformation,
- 5. Gravity movements from bedrock highs and ice highs of other kinds of glacial materials, and
- 6. The for. nation of sags, small kettles, with complex bordering faults over melting buried ice in topo-graphic lows in bedrock and in glacial sediments.
^ 2 Some structures, such as injection of till into joints in the bedrock, go back to the deglacial phase when considerable hydrostatic head was available, but the ice was not actively flowing. Other minor structures from piping and collapse are as recent as the dewatering brought on dur-ing the excavation of the trench. The others lie between those extremes. Some specific details follow. Locations of features described along the trench are designated with respect to faults, to the rock-outwash con-tact at station 7+05, and a pseudo-ice-wedge cast. I understand you have photographs of all important structures except the one described next. At fault 2781, on the north wall of the trench, a well polished and striated surface of the bedrock was exposed. On cleaning off a veneer of compact basal till that covered part of that surface the timing of displacement of small joint blocks of the rock became evident immediately. Two small joint blocks in the accompanying photo (Fig. 1) are separated from each other 1/4 to 1/2 in, by compact till; both are separated by about 1 in. of till from unjointed bedrock below. Moreover, the two joint blocks are offset horizontally up to an inch along the steeply inclined joint so that the south block (with 6 in scale) juts to the west. The irregular edge of the joint is not worn or rounded in any way, 3 nor is the block rotated as it would be if the ice were moving at the time of displacement. That displaced block would have been an obstacle to the [/) N-moving ice thac polished and striated the surface. The displacements and injection of till must have occurred after ice movement ceased, but while considerable hydrostatic head existed in the ice to inject the compact basal till into the joints. The displacements are typical of the spalling or fracturing that occurs during unloading of continental masses of ice thousands of feet thick. It is akin to rock bursts in mines. The unbroken rock below denies a deep-seated fault origin. The very dense compact basal till in the joints is often brittle enough to retain fractures if broken after unloading is completed. None were seen. In other places in the trench till was injected as much as 15 to 20 ft below the surface into small joints with various orientations. At fault 2781 on the south wall, compact bouldery till covers the fault. Its finer portion is similar megascopically to that injected into the joints on the north wall. No breaks were seen in the till. At fault 2819 on the south wall, compact basal till was seen locally in the fault zone on fractured roe and was covered by stratified deposits. The sag structures in the stra fied deposits are typical of those related to the melting out of s.nall buried ice blocks to produce miniature kettles. It seemed reasonably clear in the trench extending southward along the fault that the southward moving ice had plucked irregularly the broken weak rock in the fault zone. The orientations of the sag structures and stratification in the sediments point to a bedrock low farther south. The orientation of the minor faults shows clearly that the j-~ sediments immediately over the fault have dropped like a graben. The
N 3 I
fault would have to be a graben only 2 to 3 ft wide to generate the pattern of displacements seen in the drift. The kettle origin is common-place and expected here. The stratified drift at the rock contact at station 7+05 has numerous minor structures related to gravity movement and loading during deposi-tion to small displacements related to collapse of piping conduits that formed probably by dewatering during excavation of the trench. Typical downdrag of sediments during compaction and dewatering appear along the rock face. All such structures are strictly normal and widespread in glacial deposits. I saw no reason to refer any of them to bedrock displacements. The pseudo-ice-wedge cast is a term I have applied to similar features elsewhere in Connecticut. An abstract was published recently (copy attached), and a manuscript has been submitted for publication (a copy can be supplied if needed). In short, the wedge structure is typical of those produced by intermittent tension movements within the sediments. The opening produced allows blocks of stratified sediments on both sides t to break loose from the host on small breaks inclined downward toward the apex or for material to simply flow into the void. Many wedges in Connecticut can be traced downward to their apices. The apices are mostly in finer sediments than the upper part or are at or in the water table. ( Typically, they are in polygonal array around kettles; single wedges
\ commonly parallel topographic discontinuities, such as a stream or shore.
Fluctuating water tables, loading, and creep of semi-rigid material over plastic material in the groundwater zone lead to their formation. Near Storrs, Connecticut, they are especially abundant in the upper part of kame terraces along streams where sediments are many tens of feet thick and are creeping intermittently toward a stream. The wedges disappear in the vicinity of the water table. In the one in the trench, the upper part of the wedge cuts dark brown iron-stained horizons and is younger than the oxidation. Near the apex, the iron stains swing out horizontally a from the wedge into the sediments. The lowermost part of the wedge is in plastic fine sediments. Seemingly, the wedge has been extending itcslf downward as it widens. Movements are probably going on slowly but inter-mittently today. I see no reason why this wedge should be related to bedrock movements, nor do I know of any in Connecticut that are. i In conclusion, I reiterate my firm belief that no structures seen in the glacial deposits and soils in the discharge trench are related to post-glacial activity on bedrock faults. All structures seen are typical and normal for glacial complexes formed in proximity to wasting ice during deposition or later to normal gravity, compaction, dewatering, and related processes common to such sediments. If a need to expand on these remarks arises, or if you have other questions, please feel free to contact me. D Respectfully submitted, 4
%. ,u,,
' .'y' '~.!;yy
/ '~- /NMW Robert F. Black Enclosure 1 - photograph AIPG No. 1023 Enclosure 2 - abstract
.KRUEGER INTERPRISES, lNC.
O -
. L y GE0CHRON LABORATORIES DIVISION 24 BL ACKs f 0NE s TRE E T + CAu SRID cE. w A. 02 t39 e 3:'.1'6. :6 3;
/
l ?OTA551UM-AR00N AGE DETERMINATl0N RE? ORT 0? ANAL (7 0\L 1 RK . PRIORITY SAMPLE Our Sample No. M-6233 Date Rxeived: 6/4/82 Your
Reference:
P.O.#2199.073-480 Date Raported: 6/7/82 4 , Submitted by: Frank S. Vetere i Stone & Webster Engineering Corp. 1 P.O. Box 2325 Boston, MA 02107 i Sample Description & Locality: Sample A, less than 2 micron fault gouge, Millstone Nuclear Power Station - Unit 3. Material Analyzed: clay sample, analysed as received. ( Ar 40 */K4 ' = .008608 AGE = 142 +/- 6 M.Y. .i Argon Analyses: 1 Ar 4 0
- ppm., Ar 4*/ Total Ar Ave. Ar4' *, ppm.
.02139 .752 .02133
.02127 .728 Pctassium Analyses:
%K Ave. %K K 4, ppm I 2.051 2.031 2.478 j 2.011 Constants Used:
! 1 in
~
A3+b- x Ar 40 ' l i AJ = 4.72 x 10-/ year AGE = e3 .g +;l 3 m e ge a
! Ae = 0.585 x 10-/ year K '*/K = 1.22 x 10 '* g./g.
4 Note: Ar
- refers to radiogenic Ar **.
M Y. refers to millions of years.
Table 1 List of Joints, Discharge Tunnel Floor Final Grade Joint No. Strike Dip Remarks 2780A N68W 73N Linear biotite seam 4 in, wide, parallel to foliation, weathered to sof t, green clay, zone of shear. 2781 N07W 45W Straight to s1. irregular, ;olished with slickensides, right lateral di<. placement of 1.5 in, O to 4 in, wide zone of fractured rock, minor clay, minor iron oxide stain. 2782 N30E 88S S1. irregular, dips to N cnd S, tight, iron oxide stain, sof t , light green coating to 1/8 in. 2783 NO3W 87E Straight, smooth, clean, tight, minor iron oxide. 2784 N02E 80E Straight, smooth, tight, thin white and it. green, hard siliceous coating. 2785 N79W 70N Linear, smooth to s1. rough, tight, thin siliceous coating, minor iron oxide. 2786 N12E 86W Straight to s1. curved, smooth, soft it. green filling to 1/4 in, minor iron oxide, dips to E and W. 2787 N21E 70W Straight, tight, s1. irregular, thin siliceous filling. 2788 N109 90 Curved to irregular, smooth, tight, clean. 2789 h82W 88 N6S Straight to s1. irregular, smooth, tight, clean, s1. iron oxide. 2790 N12E 75E Straight, smooth, clean, tight. 2791 N14E 90 Straight, smooth, clean, tight, set of 4, 6 to 12 in. spacing. 2792 N25E 88W Straight, smooth, clean, tight. 2793 N14E 90 Straight to arcuate, smooth, clean, tight. 2794 N85W 85N Straight, smooth, clean, tight, s1. iron oxide stain. 9 BX212179-2
- 2. ,
Joint l No. Strike Dip Remarks 2795 Nile 81N Straight, very smooth, tight, white and green siliceous coating, minor iron oxide. 2796 N20E 79W Curved to irregular, tight, sl. rough, soft green filling to 1/8 in. 2797 N02E 76W Straight, smooth, s1. open,-It. green and white mineralization to 1/8 in, minor iron oxide. 2798 N01E 78W Straight, smooth, s1. open, maroon coating. 2799 N02E 59W Straight, tight, smooth, It. green siliceous coating to 1/8 in, minor iron oxide. 2800 N60E 77N S t ra igh t , tight, smooth, clean, minor iron oxide. 2801 N08E 78W Straight to sl. en echelon, smooth, tight, clean, sl. iron oxide stain. 2802 N08E 78W Straight, smooth, tight, soft ~lt. green coating to 1/16 in. _ 2803 N01E 78W Straight to s1. undulatory, smooth, t igh t , thin it. green and white filling, minor iran oxide. 2804 N24E 81W Straight, smooth, tight, thin white coating, minor iron stain. 2805 N85E 83N Linear to sl. irregular, smooth, soft it. green coating, minor iron oxide. 2806 N10E 61W Straight, smooth, tight, clean, minor siliceous coating. 2807 N05E 66W Straight, smooth, t igh t , hard white mineral coating. 2808 N05E 78W Straight, smooth, clean, tight. 2809 N21W 86W Straight to curvilinear, smooth, clean, tight. i 2810 N04E 61W Straight, smooth, tight, fresh, thin white filling. l l BX212179-2
3. i Joint-No. Strike Dip Remarks 2811 N04E 75W Straight, smooth, clean, t igh t. 2812 N06E 90 Straight, smooth, tight, filled with quartz and soft siliceous material to 3/8 in. 2813 N17E 84W Straight to s1. curved, smooth to s1. rough, tight, hard white siliceous coating to 1/16 in. 2814 N12E 83W Straight, smooth, tight, thin white siliceous coating. 2815 N14E 87W Straight, smooth, tight, thin white to it. green siliceous filling. 2816 N10E 83W Straight, smooth, tight, white to green siliceous coating, set of 2, 6 in. apart. 2817 N10E 83W S1. irregular zone 1.0 in wide, filled with drusy quartz, minor breccia, heavy iron stain, 1.3 ft left lateral displacement. 2818 N17E 77W St. irregular to linear fault zone 1 to 6 in
} wide, filled with drusy quartz and fractured V rock, 1.5 ft right lateral displacement, heavy iron oxide stain.
2819 NI5E 81W Linear zone of movement 2.0 ft wide filled with drusy quartz and breccia, minor clay, heavy iron oxide, unable to determine amount or sense of movement. 2820 N04E 84W Straight to curvilinear, smooth, tight, white filling to 1/3 in. 2821 N21E 77W Straight, smooth, tight, It. green clay filling to 3/8 in. 2822 N12E 87E Straight to discontinuous and en echelon, j smooth to s1. rough, clean to filled 1/8 in. i with green clay, set of 6, some drusy quartz, related to fault 2819. !- 2823 N05E 80E Curved, smooth, tight, hard white siliceous j coating to 1/16 in. 2824 N02E 85W Linear, smooth, tight, clean.
, 2825 N06E 88E Linear, smooth, tigh t, clean.
( BX212179-2 l
4. Joint No. Strike Dip Remarks 2826 N10E 88W Linear, smooth, tight, siliceous filling to 1/16 in. 2827 N05E 81W Linear, smooth, tight, filled to 1/2 in.with siliceous material, some quartz crystal growth. 2828 N0$E 82E St. irregular, si. rough to smooth, tight, thin siliceous coating. 2829 N10E 80W Straight, smooth, tight, thin green coating. 2830 N02E 89E Straight to s1. curved, smooth, tight, thin siliceous coating. 2831 N13E 6vW Straight, smooth, tight, green and white siliceous filling to 1/8 in. 2832 N14E 80E St ra igh t , smooth, clean, tight. 2833 N13E 86E Straight, smooth, tight to s1. open, green filling to 1/4 in. \ 2834 N12E 85W Straight, smooth, tight, thin green and white siliceous filling. 2835 N13E 61W Straight, smooth, tight, green and white filling to 1/2 in., surface vuggy with some quartz crystal growth, moderate iron stain. 2836 N08E 55W Straight, smooth, tight, soft greenish fill to 1/4 in, s1. vuggy. 2837 N15W 81E S tra igh t , smooth, tight, clean. 2838 N04E 71W Straight, smooth, tight, thin siliceous coating. 2839 N16W 87W Straight to s1. irregular, smooth, tight, clean. 2840 N11E 67W Straight, smooth, clean, tight, sl. iron oxide stain. 2841 N11E 79W Straight, smooth, It. green fill to 1/16 in., tight. 2842 N12E 72W Smooth to s1. irregular, straight to s, curvilinear, tight, clean, minor iron oxide. BX212179-2
5. g Joint ( No. Strike Dip Remarks 2857 N20E 85SE Straight to en echelon, smooth, tight, hard siliceous, crystalline coating with slight iron oxide staining. 2858 N10E 70NW Straight, smooth, tight, dark green coating, minor iron oxide staining. Continuation of joint 2840. 2659 N05W 88E Straight to s1. irregular, smooth, tight, hard dark green coating with moderate iron oxide staining. 2860 N12E 71SE Straight to irregular, smooth to slightly rough, tight, clean. 2861 N06E 74SE Straight, smooth, clean, t igh t , minor iron oxide staining. 2862 N18E 54SE Straight, smooth, tight, very thin, hard siliceous coating, minor iron oxide staining. 2863 N06E 74SE Straight, smooth, tight, white siliceous coating, minor iron oxide staining. 2864 NISE 75SE Straight, smooth, tight, clean, minor iron oxide staining. Lies partially along the gneiss / granite contact. 2865 N09E 69SE S tra igh t , smooth to s1. rough, tight to si. open, moderate iron oride staining. 2866 N15E 65SE Straight, smooth, tight, moderate iron oxide staining. 2867 N22E 84NW Straight, smooth, tigh t , hard siliceous coating, moderate iron oxide staining. 2868 N10E 83SE Straight t o s 1. irregular, white weathered coating to 1/16 in., moderate iron oxide staining. 2869 N15E 72SE Arcuate, smooth, tight, clean. 2886 N23E 89SE Straight, smooth surface, t igh t , dark green coating, very sl. iron oxide staining. 2887 N18E 65SE Stra igh t to curvilinear, smooth surface, tight, siliceous coating, slight iron oxide
' staining.
BX212179-2
6. Joint /,, \ No. Strike Dip Remarks () 2888 N08E 64SE Straight, smooth surface, tight, clean, very slight iron oxide staining. 2889 N10E 77SE Straight and irregular, smooth surface, tight, s light iron oxide staining. 2890 NI5E 67SE Straight, en echelon, smooth surface, t igh t , clean. 2891 N10E 56SE Straigh t to si. irregular and discontinuous, smooth sur f ace , tight, clean, some iron oxide staining. 2892 N19E 73SE Straight, smooth surface, open to 1/8 in, s1. iron oxide staining. 2893 N19E 73SE Similar to joint 2892; s1. en echelon, open to 1/4 in. 2894 N20E 85SE Straight, smooth surface , open to 1/8 in, filled with it. green and white weathered material, minor iron oxide staining. ['} 2895 N12E 61SE Straigh t smooth surface, tight to open (,) 1/8 in, minor iron oxide staining. 2896 N02E 69W Straight, smooth surface, tight, iron oxide staining. 2897 N10E 62SE Straight, smooth surface , tight to open 1/8 in., occasional greenish grey siliceous coating, minor iron oxide staining. 2898 NllE 74NW Straight, smooth surface, tight, clean. 2899 N14E 88NW Straight, en echelon with a set of 2-4 about 5 in. apart, tight to open 1/4 in, white to greenish grey siliceous coating, minor iron oxide staining. 2900 N20E 74SE St. irregular, si. rough surface, tight, white siliceous coating. 2901 N20E 77NW Straight, s1. rough surface , tight to open 1/16 in, iron oxide staining. 2902 N28W 28NE Irregular, rough surface, tigh t, minor iron oxide staining. /'s s t ra igh t , t, / 2903 N24E 80NW Very smooth surface, tight, clean. BX212179-2
7. Joint No. Strike Dip Remarks 2904 N45W 62SW Irregular, rough surface, tight, clean. 2905 N28E 63SE Sl. irregular, sl. rough surface, tight, minor iron oxide staining. 2906 N08E 73NW Straight, s1. rough surface, tight, minor iron oxide staining. BX212179-2
1 Table 2 L/ List of Joints, Discharge Tunnel Walls Joint _ No . Strike Dip Remarks 956 N64W 63N S1. irregular, s1. rough, open to 1/4 in, minor iron oxide staining. 957 N05W 43SW Same as floor joint 2781. 958 N73E 80S Straight, s1. rough, tight, clean, very minor iron oxide staining. 959 N05E 85NE Straight, smooth, surface filled with soft it. green siliceous material to approxi-mately 1/4 in, moderate iron oxide staining. 960 N20W 86S Straight, smooth, tight, clean, very minor iron oxide staining. 961 N45W 86N Straight, smooth, tight, clean. p 962 N08E 78NW Straight, smooth, si. open with thin sili-V ceous statning. coating, moderate tron oxide 963 N01W 77NE Straight to s1. irregular, smooth to s1. rough surface. 964 N06E 55NW Straight, smooth, tight, clean, moderate iron oxide staining. 965 N16W 84S Straight, smooth to s1. rough surface, open to 1/4 in, clean, minor iron oxide staining. 966 N08E 78N Same as floor joint 2802. 967 N10E 61N Same as floor joint 2806. 968 N16E 83N Straight, smooth, tight, minor iron oxide staining. 969 N69E 72S Straight, smooth to si. rough, open at top to 1/2 in, iron oxide staining. 970 N06E 65NW Straight, smooth, tight, clean. 971 N01E 64NW Straight, smooth, tight, clean. 972 N15E 79NW Straight, smooth, tight, clean. BX212179-2 i
2 p Joint t No. Strike Dip Remarks ' 973 N66E 85W Straight to s1. irregular, smooth, open to 1/4 in, It. green siliceous coating, minor iron oxide staining. 974 N06W 88E Straight to curvilinear, smooth to s1. rough, tight to s1. open, thin siliccous coating and quartz filling to 1 in. Discontinuous set of six joints. Heavy iron oxide staining. Same as floor joint 2817. 975 N10E 76S Similar to 974. Same as floor joint 2818. 976 N05 77W Similar to 974. Same as floor joint 2818. 977 NO3E 80W Straight, smooth, open to 1 in, clay, sili-ceous filling, and crystalline quartz filling to 1 1/2 in, heavy iron oxide staining. Same as floor joint 2819, 978 N10W 86S Straight, smooth, thin siliceous coating. 979 N01W 85S Straight to irregular, smooth to s1. rough, tight with siliceous infilling to 1/16 in, moderate iron oxide staining. 980 N08W 89W Stra igh t , smooth, open to 1/4 in, clean, minor iron oxide staining. 981 NO3W 89E Straight, smooth, tight, clean, minor iron oxide staining. 982 N32E 83S Straigh t to s1. irregular, smooth, tight, clean, minor iron oxide staining. 983 N10E 72S Straight, smooth, tight, clean. 984 N23E 53N Straight, smooth, tight, clean, minor iron oxide staining. 985 N48E 07S Irregular, smooth to s1. rough, tight, clean, minor iron oxide staining. 986 N-S 72E Straight to s1. curved, smooth, tight, thin siliceous coating, minor iron oxide staining. 987 N17W 83N Straight, smooth, tight, clean. O 988 N78W 86S S1. irregular, smooth to s1. rough, tight, clean, minor iron oxide staining. 989 N12W 42S Same as floor joint 2781. BX212179-2
3 Joint (} No. Strike Dip Remarks V NllE Curvilinear, smooth to s1. rough, open to 990 65W 1/4 in, clean. 991 N01E 76E Straight, smooth, tight, clean. Set of 3, 8 in. apart. 992 N86W 84N St. irregular, smooth to s1. rough, tight, clean. 993 NO3E 80E Straight, smooth, tight, thin siliceous coating. Set of 3, 3-5 in. apart. 994 N08E 83E Straight, smooth, tight, thin siliceous coating. Set of 3, 2-6 in, apart. 995 N25E 74E Straight, smooth, tight, clean. 996 N83W 79S Arcuate, s1. rough, tight, clean. 997 N15W 88N Straight, smooth, tight, thin, it. green soft siliceous coating. 998 NISE 85N Straight to en echelon, smooth, tight, thin siliceous coating. O, 999 N18E 89NW Straight, smooth, s1. open, It. green coating. Irregular set of 6, 1-4 in. apart. 1000 N55W 90 Straight, smooth to s1. rouFh , open to 3/4 in, soft weathered siliceous fill to 3/4 in, heavy iron oxide staining. 1001 N20E 76NW Straight, smooth, tight, clean, minor iron oxide staining. 1002 N13E 77NW Straight to curved, smooth to s1. rough, open to 1 in, soft weathered it, green fill ! up to 1 in. 1003 N16E 72NW Straight, smooth, open to 1/2 in, It. green soft weathered fill to 1/2 in. i
- 1004 N50W 81S Straigh t to undulatory, smooth, clean, forms face of excavation.
1005 N12E 75NW S tra igh t , smooth, open to 1/4 in, clean, l iron oxide staining. 1006 NISE 82NW Straight, smooth, tight, clean, iron oxide l( staining. BX212179-2 l
4 Joint Og No. Strike Dip Remarks V 1007 N10E 72NW Straigh t, smooth, open to 1/4 in at top, clean, minor iron oxide coating. 1008 N06E 78NW Straight, smooth, open to 1/8 in, clean, moderate iron oxide staining. 1009 N11E 87NW Straight, smooth, open to 1/8 in, soft. it. green siliceous fill, very minor iron oxide staining. 1010 NO5E 80NW Straight to s1. irregular, smooth, zone of quartz crystals, It. green clay and rock fragments up to 1 in, wide. No offset detected. 1011 N12E 72NW Straight, smooth, tight, clean, minor iron oxide staining. 1012 NO3W 84NE Straight to s1. irregular and discon-tinuous, smooth, open to 1/8 in, occasional It. green coating, minor iren oxide staining.
~N 1013 N10E 80SE Zone of closely spaced fractures and discon-d tinuous joints 1-6 in, wide.
to open 1/8 in. Smooth, tight Some surfaces filled with soft green siliceous material, minor iron staining. 1014 NOSE 82SE Straight to s1. irregular, smooth to s1. rough, open to 1/4 in, sof t green coating to 1/8 in, no offset. 1015 N13E 87SE Straight to s1. irregular, 1/4-3 in, zone of gouge, rock fragments with quartz crystals growing on both surfaces of joint, smooth, apparent offset of 1.0 ft on vertical face with west side down. 1016 N13E 82NW Zone of fractured rock and discontinuous joints. Gouge material from 4-8 in, wide in main zone of movement. Abundant clay, drusy quartz and crystals. Mic roc rys talline black zone of mineralization up to 3/8 in, wide on actual fault surface. Unable to determine amount or direction of offset. Several small left lateral of fsets between joints 1015 and 1016. Same as floor joint 2819. BX212179-2
5 Joint No. Strike Dip Remarks 1017 N21E 79NW Straight, smooth, thin siliceous coating, tight, no offset. 1018 N10E 85NW Straight, smooth, open to 1/8 in. 1019 N10W 86SW Straight, smooth, open to 1/4 in, clean, minor iron oxide stain. 1020 N50E 84NW Straight, smooth, open to 1/4 in, clean. 1021 E-W 04S S1. irregular, s1. rough, tight, thin weathered siliceous material. 1022 N44E 76SE Straight to en echelon, smooth to polished, tight, white siliceous coating. 1023 N59E 75SE Straight, smooth, tight to s1. open, clean. 1024 N55E 82SE Straight, smooth , tight to open 1/4 in, clean, very minor iron oxide stain. 1025 N52E 80SE Straight, smooth, tight to open 1/8 in, thin siliceous coating. 1026 N05E 67SE Straight, en echelon with four joints at 10 in. spacing. Smooth surfaces, tight, white siliceous coating, moderate iron oxide staining. 1027 N25W 08NE Irregular, rough, tight to open 1/4 in, heavily weathered, heavy iron oxide stain. 1028 N19E 66SE En echelon with 3 joints at 4 in. spacings, s1. rough, tight, moderate iron oxide stain. 1029 NISE 84NW Irregular, rough, open 1/8-1/4 in, clean.
'1030 N14E 88SE Straight, en echelon with 3 joints at 6 in, spacings, smooth, tight, clean.
1031 N12E 76SE Very straight, smooth, tight, clean. 1032 N01E 83SE Straight to s1. irregular, rough, tight to open 1/8 in, minor iron oxide staining. 1033 NISE 80SE Straight, smooth, tight, iron oxide stain. 1034 N11E 66NW Straight to s1. arcuate, smooth, tight, iron O oxide stain. BX212179-2
6 Joint ( No. Strike Dip Remarks b 1035 N04E 79SE Straight, en echelon with 8-10 joints at about 3 in. spacings, smooth but disjointed surfaces, tight, yellow-white siliceous coating, minor iron oxide stain. 1036 N35W 35NE Irregular, rough and broken surface , tight to open 3/8 in, clean, approximately concordant to foliation. 1037 N20E 83SE Straight, smooth, open 1/8-1/2 in, minor iron oxide stain. 1038 N80W 07N Irregular, s1. rough, tight, iron oxide stained. 1039 N10E 76SE Straight to en echelon, smooth, tight, minor iron oxide stain. 1040 N23E 76SE En echelon with 4 joints spaced at about 5 in, s1. rough, open 1/4-1 in, iron oxide stained. 1041 N30E 81SE Straight, en echelon with 4 joints spaced at 3 in, s1. rough, tight, clean. t i V 1042 N10E 88SE Straight, smooth to s1. rough, open 1/8 in and infilled with yellow-brown siliceous coating. Quartz stringers show 3 in. offset; 5 slickensides indicate normal faulting with east block down. One thin stringer and a 2-3 in. thick pegmatite vein show no displacement near top of south wall. Not traceable to north wall. Same as floor joint 2894. 1043 N18E 88SE Straight to s1. irregular, s1. rough, tight, clean, minor iron oxide stain. 1044 N17E 86SE Straight, smooth, open 1/8 in, filled with grey green, soft, k-spar clay. l 1045 N-S 65W Straight, smooth, tight to open 1/16 in, minor iron oxide staining. 1046 N08E 70NW Straight, smooth, tight to open 1/4 in. yellow-white to green grey siliceous I coating, minor iron oxide stain. Quartz stringers show 1/2 in. displacement at base of south wall but no offset near top of , /] ! wall. Same as floor joint 2899. Offset not V evident along floor. BX212179-2
. , , , - - - - e w , -n-- ~ , ,--
7 4 i Joint g No. Strike Dip Remarks 1047 N10E 63NW Straight, rough, tight to open 1/8 in, white siliceous coating, iron oxide stain. 1048 NllE 74NW S1. irregular, smooth to s1. rough, tight, clean. 1049 N11E 84NW S1. irregular, s1. rough, tight, clean. 4 1050 N02W 76W Irregular, rough, tight to open 1/8 in, clean. 1051 N12W 64SW Straight, irregular, tight, clean. 1051A N62W 77SW Straight to s1. irregular, s1. rough, very tight, clean, 2 in. quartz vein along most of d south end. , 1116 N09E 63NW Straight, smooth, tight, moderate iron i oxide stain. 1117 N09E 63NW Straight, smooth to s1. rough, tight to open i 1/8 in, clean. 1118 E-W 84N Arcuate, s1. rough, open 1/4", iron oxide
} ,/ stained.
1119 N51W 08SW St. irregular and stepped, tight, heavy iron j oxide stained. 1120 N86E OSSE Straight, smooth, tight, iron oxide stain. 1121 N07E 61NW Straight, s1. rough, tight, iron oxide ! stain.
- 1122 N10E 63NW Straight but occasionally stepped 2-3 in, l slightly rough, tight, iron oxide stained.
i
- 1123 N64W 84SW Straight, smooth to s1. rough, iron stained.
i . 1124 N15E 69E Straight to curvilinear, smooth to s1. l irregular, moderate iron oxide coating, l glacial striae on surface. 4 l 1125 N21E 83NW Straight, smooth, clean with some soil filling, open to 1/4 in, minor iron oxide. i h d 1 ! BX212179-2
l i -
- DOCUVlENT
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M l ROCK C"x NFAULT 2781 N f I _4 \ i FIGURE 7 SKETCH OF S0ll STRATIGRAPHY i OVER FAULT 2781, SOUTH WALL ! MILLSTONE NUCLEAR POWER PLANT l UNIT 3 i
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LOOKING NORTH LOOKING SOUTH FIGURE 8 FAULTS 2817,2818, AND 2819 LOOKING NORTH AND SOUTH t MILLSTONE NUCLEAR POWER STATION UNIT 3 ,
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L i S:% . Sc2,. . <% ._ FIGURE 10 SOIL EXCAVATION OVER FAULTS 2817-2819, SOUTH WALL DISCHARGE TUNNEL MILLSTONE NUCLEAR POWER STATION UNIT 3
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I. i i i l I i i l i 1 ) FIGURE 11 4 ROCK-SOIL CONTACT ABOVE FAULT ] ZONE 2817- 2819, NORTH WALL
; MILLSTONE NUCLEAR POWER STATION
- UNIT 3 1
1 I
1 TOP OF GROUND *= 18FT. S+30 TOPSOIL L FILL
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] CLAY) SEAMS 1 I i FIGURE 12 SKETCH MAP OF S0ll EXCAVATION ABOVE FAULT 2819, NORTH i SIDE OF DISCHARGE TUNNEL MILLSTONE NUCLEAR POWER STATION UNIT 3
I i 7+05 1 O 12 - TOPSOIL L FILL GROUND LEVEL AT 16.6 i ! YELLOW-BROWN SAND (UNSTR ATIFIED) IC - I ORANGE-BROWN SANDY GRAVEL ) -
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-6 i. ! FIGURE 13 4
ROCK-OUTWASH CONTACT AT STATION 7 + 05
!(V3 l MILLSTONE NUCLEAR POWER PLANT ~
UNIT 3 i, I .. _ _ - -, . , _ _ . - _ . - . _ , - _ - . _ _ . _ . . - _ .
GROUND LEVEL + 18 (INACCESSI BLE TO GROUND LEVEL) O UNSTRATIFIED 11 SLUMP DEPOSITS LT. BROWN S ANDS G THIN { GRAVEL 9 - LT. BROWN 4 SANDS GTHIN GRAVEL 7 - GRAVEL
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FIGURE 14 SKETCH MAP OF" PSEUDO" ICE WEDGE C' CAST AT STATION 8 +15 .\ MILLSTONE NUCLEAR POWER PLANT UNIT 3 i
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m- > O i FIGURE 15
" PSEUD 0" ICE -WEDGE CAST AT STATION 8+15 0F DlSCHARGE TUNNEL MILLSTONE NUCLEAR POWER STATION O UNIT 3 . _ _ - - - _ - . - - . . - _ - - - . - - - . - _ _ _ _ _}}