ML19211C782
| ML19211C782 | |
| Person / Time | |
|---|---|
| Site: | Millstone  |
| Issue date: | 11/30/1979 |
| From: | STONE & WEBSTER ENGINEERING CORP. |
| To: | |
| Shared Package | |
| ML19211C772 | List: |
| References | |
| NUDOCS 8001140480 | |
| Download: ML19211C782 (1) | |
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1217913r 550 17/11/79 038 . ti!IPS-3 FSAR 1.16 (TAllt.E 2.5. 3- 1 1.18 ^ 1.IST OF FAtlI.TS 1.20 Senne of Amount of 1.23 Displacement in Apparent calculated 1.24 Att a t tale the ik>r izont al Dinplact1aent Displacens'n t 1.25 lault Strike Dip I' lane titi tit) Hemarks 1.26 T-1 NJ8W 707. Right Iiteral 30-35 43 Maplet at the bedrock sur- 1.28 face (t4NECo. 1975) and 1.29 again at final . 1.30 Gxcawill6rf Firade. Descritied 1.31 in Seutton 2.5.3.2. 1.32 T-2 NIHW 70E Right I.a t eral 7-0 10 Happed at the letrock sur- 1.34 f acd(tatIEco. 1975) a rul 1.35 1.36 L_again_at_ excavation final. , Descritel grade. 1.37 in Section 2.5.3.2. 1.38 508 N02W 77E Hight 1.ateral 2-3 4-5 Mapped at the letrock sur- 1.40 face (TIN Et'o. 1975). 1.41 1599 N06W 10 E Idght lateral 1 2 Fault shown in this regott 1.43 but discussed in detail in 1.44
" Fault in the Desmineralized 1.45 and Refueling Water Tank 1.46 Area" regort (t44ECo. 1977) . 1.47 T-1 Nb2E 90 I.c f t la t er a l 1-2 1-2 Displaced by T-3 (NN ECo. 1975). 1.49 13 N07E 6HW !.e f t I.a ter a l 1-1 2 Fault uncovered in tise ware- 1.51 louse No. 5 - Unit 2 conden- 1.52 sate polishing facility 1.53 excavation. Discussed in 1.5m separate report (NN ECo . 1.55 N 1976) sulanitted . 1.56 C to t he NI<C in June 1976. 1.57 U
CO #F NO3W 85W I.ei t la ter a l 1-3 2-3 Number used in the " Geologic 1.59 Mapping of the tiedrock Sur- 1.60 f ace" regert (NNECo. 1975) 2.1 O corte sgends to 461 and 2.2 W 1541 in thin regot t. 2.3 O 1 of 4
121 Nisr550 12/11/19 038 HNPS-3 FSAR TAI 41.E 2.5.3- 1 (Cont) Sense of Amoennt of Displacement in Apparent Calculat.ed Attitude the llorirontal Displacement Displacement Fault Strike Dip Plane (ft) (M) Remar_ks 461 N05h 551c Lef t latstral 0.5 Cor responds t o 1541 tound in 2.6 the auxiliary hu11 ding. Fx- 2.7 tensive shear zone with very 2.8 closely spaced joint planes. 2.9 Joint sur f aces are saww>t.h 2.10 with scene stickensides (S- J.11 33). Crystalline quartz also 2.12 evident within the fault. 2.13 1541 N01W 85W Lett lateral 0.5 Continuation of 461. Exten- 2.17 sive, severely weathered 2.18 zone, 0.1 to 1.5 ft wide. 2.19 Series of very closely spaced 2.20 joint s wit h some quartz 2.21 coating chlorite and some 2.22 clay tilling. 2.23 555 N07H 55W lef t lateral 1-2 3 Happed at the bedrock surface 2.26 (NtitCo. 1975) , cor respontis 2.27 to 368, observed at final grade. 2.28 36 8 N07W 55W Lett lateral 2-3 Smooth surfaces with iron 2.31 oxide staining and with some 2.32 chlorite-clay tilling and 2.33 some crystalline quartz. 2.34 1192 N12W 90 Left lateral 0.5 Small fault near T-3, irus 2.38 oxide stained surfaces with 2.39 - sonee clay t illing. 2.40 120 8 N12W 7% Right I.a t er a l 2.5 Major shear splaying off at 2.44 U T-3, exhthit s t hick, white 2.as 5 CD quartz coating and a tilling 2.46 of semne green clay and t ra- 2.47 g ments of weathered rock. 2.4h W 1228 N25W 75E Right lateral 2-3 8 plays off of T-3, irors oride 2.52 ~ stoined sur f acen wit h clay 2.53 ii11ings. 2.54 75 tJ((k 678h hight lateral 2 Ver y t hin, linear , 2.57 ^ f3 shear bne wille 2.5t5 crystalline quart z mating J.54 nuris.ces and chlorite 2.1,0 st a t ning. 3.1 ed 2 of 4
141791 sr 550 12/11/79 039 . MHPS-3 FSAli TILIILE 2.5.3- 1 (Cont) Sense of IJntmht of Di spl acement an Apparent Calculated At titurie the llorizosital Displacement 131splacement Fault StrikejDip Plane t i t}_ (it) Repu r ks h.3-0.15 1940 N43W 11W Thrust to low angle reverse fault with 3.4 this t heast ext ensive tractured rock and 3.5 clay 1:n fault zone. Stwwws 3.6 f evidence of hydrothermal 3.7 8 alteration. 3.8 2339 1411E;HS-90NW hight litteral 2-8 ' Illghly t ractured f ault - 3.11 i Cliene filled with gneiss 3.12 I a.rsd granit e t ra<pnent s 3.13 rehealed in a siliccous 3.14
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usy epaartz . 3 . 14 Ccoats many surfaces . 3.17 Lthroughout zone tent 3.18 I there are only occasional 3.19 geckets of clay gouge. 3.20 2330 N111:; 90 Right Lateral 2-3 Splays from 2339 - 3.22
- C atul rejoins wittrexcavation. 3.2 3t -
Ilas a similar i1111ng to 3.24 I 7339. 3.25
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228 2 t45-25E,70-USSE - $sdeterminnble IDndeterminable Displacement unknown due 3.27
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[ east side of fault zone 3.29
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e granite and gneiss in a 3.31 siti sus matrix. . 3.32 C occa ional , 3.33 /- N l C [n>ck n of clay gomye. 3.34 U ' Ileavy iron oxide staining 3.35 m t3nroug hout zone. 3.3f. 2295 ta26h 90 Itight 1.at eral 0-0.5 Splays from 2282 arul . 3.34 C I clejoins within limit of 3.39 W excavation. Similar tilling 3.40 N , l as 2292. 3.41 1 L $. I... .. t k L # /4.e.et, 2250 toSE 85-90Sh Undeterminat>1e ' linde ter minatsle The cuintinuation 01 zone 3.43 l onto the southeastern 3.44
', exca ation walls iridicates 3.45
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12179 tar $50 12/11/79 038 , MNPS-3 YSAM TA DI.P. 2.5.3-1 (Cont) Sense of Anw>unt of Displacement in Apparent C.nicula ted Attatt>1e tir Horizontal Displacement Displacement pult strikaJP_le Plane __t f_t)t im neng ks 2204 N15-JO B5-90Nt; it Lglat 1.at eral 1-2 Very linear thina sylay 3.50 t resa 2250 with severy y weathered 3.51 % gneins f illing and name 3.52 clay gouge. 3.53 4 2251 N 14 2.30-90HW 1ef t lateral 0-0.3 !; plays f ran 2204 with 3.57 very thin silicemus coating 3.58 ma nurf aces anit some 3.59 clay tilling. 3.60 t 2380 tQbW'
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. /. siliceous matrix. 4.7
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DESCRIPTION OF FAULTS IN MILLSTONE UNIT 3 - PUMP HOUSE EXCAVATION The excavation for the pump house structure of Millstone Nuclear Power Station - Unit 3 in November 1979 revealed several intersecting fault zones. The following is a su= mary of the field notes describing the eight most prominent zones. This does not include minor shear planes which branch from the eight faults and die out within the excavation. Results from the X-ray diffraction analysis and age dating of gouge samples taken from the fault zones vill be included in the Final Safety Analysis Report. 2339 N11E/85-90 NW (Strike /ufu) Highly fractured fault zone, 3 in to 12 in vide and filled with moderately to severely weathered frag =ents of granite and gneiss, usually rehealed in a siliceous matrix. Cavities and fractures are typically coated with drusy quartz. Very thin clcy gouge film coats many surfaces but is rarely in pockets. Apparent right lateral displacement of granite dikes ranges between 2 ft (south of intarsection with 2330) and 8 ft (north of intersection with 2330). Two sets of slichensides measured along the zone plunge to the southwest at h5 deg, indicating the final movement to be oblique-slip. 2330 Nile / Approx 90 Highly fractured fault zone which splays off of fault 2339 in the northwestern portion of the excavation and appears to join again just beyond the southern excavation limit. The composition of fault zone 2330 is similar to that of 2339 1738 055
2 Apparent displacement along 2330 is 2 ft to 3 ft right lateral. The set of slickensides found along the fault zone plunges at '6 deg to the southwest, indicating at least the final movement to be oblique-slio. 2282 H5-25E/70-85 SE Sinuous, highly fractured zone, less than 1 ft vide and extending across the entire excavation. The major zone is filled with less than 6 in vide lenses of siliceous material (possibly cataclasite) with occasional fragnents of granite or gneiss. Most of the associated fractures are coated or filled with drucy quartz. White clay gouge coats some surfaces and occurs only rarely in' pockets. The zone follows the vestern side of a granitic pegnatite intrusion, preventing any estt= ate of apparent displacement. however, similarities between 228? and 2339 (size and composition of zone) indicate a similar amount of displacement. Slickensid.es on shear planes branching from 2283 indicate dip-slip movement. 2295 ::26E/93 Sinuous, fractured fault zone which splays off of 2282 at the southern side of the excavation and rejoins at the north Vall. At the south endof 2295 the zone width and filling are similar to 2282. To the north, fault 2295 becomes a very thin shear zor with a siliceous filling and a very thin clay coating. Apparent right lateral displacement along the zone ranges fron 0 to 6 in, judging fran offset of P-28, P-29, P-30, and P-31. A set of slickensides found on a branching joint su-fac. indicates dip-slip movement. 1738 056
3 2250 N05E/85-90 SE Slightly sinuous, highly fractured zone up to 1.5 ft Vide. The major shear plane contains a filling up to 3 in thick of fragnented cranite and gneiss surroe.nded by either clay gouge or drusy quartz. Along the southeast vall of the excavation, the zone changes into a set of closely to very closely spaced en echelon joints. Due to the lack of regular gneiss-granite contacts on either side of the zone, tne amount of displacement is undeterminable from the floor exposure. However, the extension of thic zor.e onto the southeast rock face shows 6 in to 7 in of total reverse displacement (west side down) in a stepped arrangement along the en echelon joint set. Displer:ement was measured from offset of two 1 in wide, parallel and very planar granite dikes trending N70E/h5 SE. 220h N15-20W/85-90 NE Very planar fault zone that splays to the southeast off of 2250. The zone is less than 3 in vide and filled with moderately to severely weathered gneiss, lenses of clay gouge, and angular fragnents of gneiss in a siliceous matrix. Surfaces are occasionally coated with crystalline quartz. Joints branching off from 220h every few feet have a clay filling and occasional crystalline quartz coatings. Apparent right lateral displacement along 220h is approximately 1 to 2 ft, measured from offset of two 1 in vide, extremely planar granite dikes trending N70E/h5 EE. Slickensides along the fault are vague but appear to plunge at 36 deg to the northwest . Where pegmatite P-26 intersects 220h, an apparent right lateral 1738 057
h displacement of 0 to 6 in is indicated. P-26 roughly follows the trend of the foliation of N70W/57 UE. 2251 UlhE/80-90 IN finuous shear plane that splays to the south off of 2204 Surfaces within zone are smooth to slightly rough with occasional crystalline quartz coating and clay filling. Shear plane branches into an en echelon joint set at the intersection with the southeast rock face. Possible auparent left lateral displacement of several inches is indicated along the south end of 2251. Two separate sets of slichensides show plunges of 35 des and Th deg to the north, respectively. 1738 058}}