ML18115A294
| ML18115A294 | |
| Person / Time | |
|---|---|
| Site: | Diablo Canyon  (SNM-2511) |
| Issue date: | 03/07/2018 |
| From: | Pacific Gas & Electric Co |
| To: | Office of Nuclear Material Safety and Safeguards |
| Shared Package | |
| ML18115A285 | List: |
| References | |
| DIL-18-001 | |
| Download: ML18115A294 (13) | |
Text
C Diabase intrusion, hydrothermal alteration and localized deformation (18 to 12 million years ago)
D Tectonic deformation including folding and faulting.
(12 to 2 million years ago)
B Dolomitization of the marine sequence and invasion of petroliferous fluids.
(22 to 14 million years ago)
A Original marine deposition showing original lateral continuity of bedding (22 to 14 million years ago)
F E xcavation of borrow slope (1971)
E S urface weathering and erosion Tofb-1 Tofb-1 Tofb-1 Tofb-2 Tofb-2 Tofb-2 Tofb-1 Tofb-1 Tofb-1 S urface weathering E xplanation 0
100%
Limestone S iltstone S andstone Clay Dolomitization Petroliferous zone Localized friable/altered zone Diabase intrusion Hydrothermal alteration Fault - sense of vertical separation is indicated by arrows, and inferred horizontal right-slip displacement by (moving away from viewer) and (moving toward viewer).
NOR THE AS T S OUTHWE S T NOR THE AS T S OUTHWE S T NOR THE AS T S OUTHWE S T NOR THE AS T S OUTHWE S T NOR THE AS T 1971 Borrow area cut IS FS I S OUTHWE S T NOR THE AS T Diablo Canyon S OUTHWE S T Diablo Canyon Tofb-2 Tofb-1 Tofb-1 (1 million years ago to present)
FSAR UPDATE DIABLO CANYON ISFSI FIGURE 2.6-13 DIAGRAMMATIC CROSS SECTION ILLUSTRATING THE DEPOSITIONAL AND STRUCTURAL HISTORY OF THE ISFSI STUDY AREA Revision 0 June 2004
Age, million years (Timeline not to scale)
Deposition of stratigraphic units Diabase intrusion Possible hydrothermal alteration Petroleum accumulation E rosion and weathering Folding Faulting 1
2 5
10 20 22 0
Tof Obispo Formation Tmb Monterey Formation Pismo Formation Miguilito Member S quire Member Qtm Marine terraces
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Pres ent
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Dolomitization Not present in IS FS I study area (removed by erosion)
FSAR UPDATE DIABLO CANYON ISFSI FIGURE 2.6-14 CHRONOLOGY OF STRATIGRAPHY AND GEOLOGIC PROCESSES AT THE ISFSI STUDY AREA Revision 0 June 2004
Dolomite, clayey dolomite, dolomitic siltstone to fine-grained dolomitic sandstone, and limestone. The unit contains occasional discontinuous to continuous (tens to hundreds of feet) clay beds that are generally 1/32-to 1/2-inch thick, but locally are thicker. R ocks in this unit are moderately to well cemented, moderately hard to hard, moderately to slightly weathered, brittle and typically medium strong.
Friable dolomite and dolomitic siltstone of unit Tofb-1. These rocks typically have low hardness, are very weak to weak, and occur as discontinuous zones where weathering and/or alteration has been concentrated.
Inferred lateral extent of friable zones is schematic.
Fine to coarse-grained dolomitic sandstone and sandstone (arkosic to arenitic) with lesser dolomite beds. Detrital clasts are composed primarily of dolomitized feldspars, marine fossil fragments, and volcanic rock fragments.
Discontinuous clay beds that are generally less than 1/2-inch thick occur locally within the unit. The rocks are of low to medium hardness, moderately to well cemented and typically medium strong.
Friable sandstone of unit Tofb-2. These rocks typically are of low hardness and are very weak to weak, and occur as discontinuous zones where weathering and/or alteration has been concentrated. Inferred lateral extent of friable zones is schematic.
DOLOMITE S UBUNIT S ANDS TONE S UBUNIT
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Tofb-2a Tofb-2a Clay Tofb-2a
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Tofb-1 E xplanation (Informal subunits of unit Tofb of Obispo Formation)
Clay bed; silty and sandy, tan to brown, some angular fragments within clay matrix, locally contains foraminifera, generally thin (1/16 to 1/2 inch). Clay beds more common and more laterally continuous in dolomite unit than in the sandstone unit Tofb-1a Tofb-2 Tofb-2a el. 310 feet Clay Clay Clay Clay Clay Clay Clay Clay Clay Clay S tratigraphic Level Power Block S tratigraphic Level IS FS I Pads 100' IS FS I pads grade (310')
(part of pads are on Tofb-1 because strata are offset by bedrock faults)
Tofb-1 Obispo Formation - Member Tof, unit b (Tofb)
Tofb-1 Tofb-2 Tofb-2 Tofb-1a Tofb-1a el. 310 feet Tofb-2 Dolomite unit (Tofb-1)
S andstone unit (Tofb-2) 50' Small-Scale View Large-S cale View Tofb-1 Tofb-1 FSAR UPDATE DIABLO CANYON ISFSI FIGURE 2.6-15 GENERALIZED STRATIGRAPHIC COLUMN AT THE ISFSI AND POWER BLOCK SITES Revision 0 June 2004
50 400 450 500 550 600 650 700 D
350 300 250 200 150 100 E levation (feet) 0 750 800 af
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TD 28.5 ft.
HLA B -14 Qpf af Qptm
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MAIN WAR E HOUS E Qpf
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Qdf Thin Qhf Qc Bend in S ection Bend in S ection Tofc Contact location uncertain Approximate backedge of wave-cut platform at elevation 105 feet (Q2)
Approximate backedge of wave-cut platform at elevation 145 feet (Q3)
(Lithology of Tofb in this area unknown)
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N19 E N39 E S urvey Limit af af(? )
Fill interpreted from surveyed cross section and not shown on map Transport route (R eservoir R oad)
Transport route (Plant View R oad)
Tofb
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Qptm af Tofb Notes
- 1. Location of cross section shown on Figures 2.6-7 and 2.6-8. Nearby borings are projected to cross section.
- 2. S ee Figure 2.6-9 for explanation of geologic units.
- 3. Horizontal scale = vertical scale.
0 50 S cale 25 75 100 feet 0
50 S cale 25 75 100 feet 0
50 S cale 25 75 100 feet 0
50 S cale 25 75 100 feet Matchline; S ee Figure 2.6-16b FSAR UPDATE DIABLO CANYON ISFSI FIGURE 2.6-16a CROSS SECTION D-D Revision 0 June 2004
Notes
- 1. Location of cross section shown on Figures 2.6-7 and 2.6-8. Nearby borings are projected to cross section.
- 2. S ee Figure 2.6-9 for explanation of geologic units.
- 3. Horizontal scale = vertical scale.
E levation (feet) 400 350 300 250 200 500 450 550 600 0
150 650 700 750 800 100 50 D'
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B oring 01-I E levation 575 Intersection I-I' Intersection A-A' Monocline Approximate axis of anticline TD 321.0 ft.
N31 E Tofb-1
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(Lithology of Tofb-1in this area is unknown)
Tofb-1 Tofb-1 Tofb-1a Tofb-1a Tofb-1a 0
50 S cale 25 75 100 feet 0
50 S cale 25 75 100 feet 0
50 S cale 25 75 100 feet 0
50 S cale 25 75 100 feet Matchline; S ee Figure 2.6-16a FSAR UPDATE DIABLO CANYON ISFSI FIGURE 2.6-16b CROSS SECTION D-D Revision 0 June 2004
50 400 450 500 550 600 650 700 F
350 300 250 200 150 100 E levation (feet) 0 750 800 850 900 950 1000 N39ûE N32ûE S horecliff R oad Cracks in road Clayey sand S iltstone/claystone S iltstone S aprolitic siltstone/claystone Qptm Qpf TD 84.5 feet Buried seacliff TD 41.5 feet TD 30.0 feet Tuff Qls af Qls Qpf Tofc S ea level HML-2 HML-3 Landslide headscarp Nested slide complex PC-1 R eservoir R oad WLA 96-1 projected 220 feet Bend in section FR -1 S hale Qpf S hale TD 75 feet
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Contact location uncertain Approximate backedge of wavecut platform at elevation 105 feet (Q2)
Approximate backedge of wavecut platform at elevation 145 feet (Q3)
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Qpf Qhf FR -2 Patton Cove Landslide Approximate backedge of wavecut platform at elevation 35 feet (Q1)
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Bedrock dip in this area approximate TD 39.4 feet Patton Cove Tofc Tofc Tofb Transport route is 40 feet to the northwest of this area 0
50 25 75 100 feet S cale Matchline; S ee Figure 21-19b Notes
- 1. Location of cross section shown on Figures 21-3 and 21-4. Nearby borings are projected to cross section.
- 2. S ee Figure 21-13 for explanation of geologic units.
- 3. Horizontal scale = Vertical scale.
FSAR UPDATE DIABLO CANYON ISFSI FIGURE 2.6-17a CROSS SECTION F-F Revision 0 June 2004
E levation (feet) 400 350 300 250 200 500 450 550 600 0
150 100 50 650 700 750 800 850 900 950 1000 F'
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Qpf/Qc Qc Qdf Qc Axis of syncline Axis of anticline Tofb Tofb Tofb Tofb Overlook at end of S ea View R oad is 100 feet to north 0
50 25 75 100 Feet S cale Matchline; S ee Figure 2.6-17a Notes
- 1. Location of cross section shown on Figures 21-3 and 21-4. Nearby borings are projected to cross section.
- 2. S ee Figure 21-13 for explanation of geologic units.
- 3. Horizontal scale = Vertical scale.
FSAR UPDATE DIABLO CANYON ISFSI FIGURE 2.6-17b CROSS SECTION F-F Revision 0 June 2004
Approximate 1971 pre-borrow excavation topography 0
50 S cale 25 75 100 feet
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Notes
- 1. Location of cross section shown on Figures 2.6-7 and 2.6-8. Nearby borings are projected to cross section.
- 2. S ee Figure 2.6-9 for explanation of geologic units.
- 3. Horizontal scale = vertical scale.
100 50 650 700 750 50 400 450 500 550 600 650 700 I
350 300 250 200 150 100 E levation (feet)
E levation (feet) 400 350 300 250 200 500 450 550 600 0
0 750 800 800 150
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Tofb-2 Qls
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Diablo Creek TD 58.6 ft.
TD 30.0 ft.
CTF S ubgrade CTF S ubgrade CTF IS FS I Pads Grade IS FS I Pads R eservoir R oad Pads S ubgrade IS FS I cutslope T-18B TD 71.8 ft.
TD 72.0 ft.
01-A 01-B 01-H
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Tofb-2 TD 101.0 ft.
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TD 130.5 ft.
Tofb-1
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Qc Qc
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Approximate location of contact projected from field mapping along reservoir road (Not shown on Figure 2.6-7)
Tofb-1 01-F tower access road Intersection B"-B
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T-11D
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Intersection A-A' 00B A-1 Tofb-2 Tofb-1 Tofb-1 01-I
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tower access road T-14A Intersection D-D' Clay bed in trench T-15 projected to section TD 321.0 ft.
Tofb-1 Tofb-1 01-CTF-A 00B A-3
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Monocline S yncline Monocline S yncline N59 W
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Top of 1971 Borrow cut
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S urvey Limit
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TD 150.0 ft.
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1,149,000 E I'
Tofb-2 Clay beds are presumed to occur and extend across this area, but may not be continuous with those from the borings.
Boring 00BA-1 is projected 78 feet west to section, and shown in a down-dip transposed location (approximately 11 feet lower in elevation) to place claybeds and other borehole features in correct down dip position.
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Tofb-2a Tofb-2a Tofb-2a Tofb-2a Tofb-1a Tofb-2a Tofb-1a Tofb-2a Tofb-2
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Tofb-1a Tofb-1a S tructural change S tructural change FSAR UPDATE DIABLO CANYON ISFSI FIGURE 2.6-18 CROSS SECTION I-I Revision 0 June 2004
0 50 S cale 25 75 100 feet 0
50 S cale 25 75 100 feet 0
50 S cale 25 75 100 feet 0
50 S cale 25 75 100 feet E levation (feet) 400 350 300 250 200 0
150 100 50 L'
L 50 400 350 300 250 200 150 100 E levation (feet) 0
-50
-100
-50
-100 Notes
- 1. Location of cross section shown on Figures 2.6-7.
Nearby borings are projected to cross section.
- 2. S ee Figure 2.6-9 for explanation of geologic units.
- 3. Horizontal scale = vertical scale.
Note: Detailed topography and fill near facilities not shown on Figure 2.6-7 TD 300.5 ft.
DDH-D UNIT NO. 2
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Tofb-2 N67 E E levation profile and bedding attitudes from FS AR Figure 2.5-15 (R ev 11, Nov. 1996)
Tofb-2 Tofb-1 S andstone S ilty sandstone with thick clay coatings S iltstone S ilty calcareous siltstone S cattered crushed foraminifera Abundant foraminifera S ilty calcareous silty sandstone S ilty calcareous sandstone with some friable zones Qpf S ilty sandstone TD 120.0 ft.
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Tofb-2 Tuffaceous sandstone Tuffaceous sandstone S ilty sandstone Backedge of 145' wavecut platform (Q3)
S ilty sandstone Tuff intrusion Tuffaceous sandstone FUE L HANDLING/
AUX. BLDG.
CONDE NS ATE S TOR AGE TANK R AD WAS TE BLDG.
Graded to 115' elevation per DCPP drawing
- 438042 HLA-7 HLA-1 Transport route (R eservoir R oad) af
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Bedrock seastack encountered in HLA-1 not projected into section Qpf
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FSAR UPDATE DIABLO CANYON ISFSI FIGURE 2.6-19 CROSS SECTION L-L Revision 0 June 2004
Termination Termination Termination of Joint of Joint of Joint Dolomite (Tofb-1) exposed along Reservoir Road above parking lot 8. Exposure illustrates well-bedded strata. Some joints terminate at bedding planes (e.g., in left middle). Gray is unweathered, and brown is weathered rock. Photo roll JLB-4.
FSAR UPDATE DIABLO CANYON ISFSI FIGURE 2.6-20 CLOSE-UP VIEW OF WELL-BEDDED DOLOMITE ALONG RESERVOIR ROAD Revision 0 June 2004
Outcrop of thick to massive bedded, weathered sandstone of unit (Tofb-2), directly west of the ISFSI. Photo roll JLB OLD-2.
FSAR UPDATE DIABLO CANYON ISFSI FIGURE 2.6-21 SANDSTONE OUTCROP IN THE ISFSI STUDY AREA Revision 0 June 2004
Friable sandstone (Tofb-2a) in trench T-1. The friable sandstone generally is weakly bedded and jointed. A small near-vertical fault is indicated by oxidized clay stringers in the sandstone. Photo roll JLB-3.
fault FSAR UPDATE DIABLO CANYON ISFSI FIGURE 2.6-22 FRIABLE SANDSTONE IN TRENCH T-1 Revision 0 June 2004
Clay bed within dolomite (Tofb-1) with sample tube in trench T-14B. Photo roll JLB-8.
FSAR UPDATE DIABLO CANYON ISFSI FIGURE 2.6-23 CLAY BED IN TRENCH T-14B Revision 0 June 2004