ML20281A407
| ML20281A407 | |
| Person / Time | |
|---|---|
| Site: | Humboldt Bay |
| Issue date: | 09/03/2020 |
| From: | Pacific Gas & Electric Co |
| To: | Office of Nuclear Material Safety and Safeguards, NRC/OCM |
| References | |
| HIL-20-005 | |
| Download: ML20281A407 (24) | |
Text
FSAR UPDATE HUMBOLDT BAY ISFSI FIGURE 2.6-21 Geologic cross section B-B' across a trace of the Little Salmon fault zone at College of the Redwoods, 5 kilometers south of Humboldt Bay ISFSI site (after LACO Associates, 1999b, Figure 6). Location of cross section shown on Figure 2.6-18.
0 100 Feet 0
30 Meters S cale vertical = horizontal E XPLANATION ALLUVIUM 5 - ACTIVE CHANNE L DE POS ITS ALLUVIUM 2 - OLDE R FAN DE POS ITS ALLUVIUM 1 - FLUVIAL OR OLD BAY DE POS ITS UNDIFFE R E NTIATE D LANDS LIDE DE POS ITS MAR INE TE R R ACE DE POS ITS Qal 5 Qal 2 Qtrn 1 Qls Qtm 2 Revision 0 January 2006
E XPLANATION ALLUVIUM 5 - ACTIVE CHANNE L DE POS ITS MAR INE - BAY MAR GIN DE POS ITS ALLUVIUM 2 - OLDE R FAN DE POS ITS ALLUVIUM 1 - FLUVIAL OR OLD BAY DE POS ITS MAR INE TE R R ACE DE POS ITS - 3 CONVE NTIONAL 14C AGE OF 5198 +/- 349 YE AR S BP Qal 5 Qm Qal 2 Qal 1 Qtm 3 A
0 100 Feet 0
30 Meters S cale vertical = horizontal FSAR UPDATE HUMBOLDT BAY ISFSI FIGURE 2.6-22 Geologic cross section C-C' across a trace of the Little Salmon fault zone at College of the Redwoods, 5 kilometers south of Humboldt Bay ISFSI site (after LACO Associates, 1999b, Figure 7). Location of cross section shown on Figure 2.6-18.
Revision 0 January 2006
E XPLANATION ALLUVIUM 5 - ACTIVE CHANNE L DE POS ITS ALLUVIUM 4 - YOUNGE R FAN DE POS ITS ALLUVIUM 3 - CHANNE L AND POND ALLUVIUM 2 - OLDE R FAN DE POS ITS ALLUVIUM 1 - FLUVIAL OR OLD BAY DE POS ITS UNDIFFE R E NTIATE D LANDS LIDE DE POS ITS MAR INE TE R R ACE DE POS ITS HOOKTON FOR MATION 3,540 60 YE AR S BP (CALIBR ATE D 14C AGE )
14,380 100 YE AR S BP (CALIBR ATE D 14C AGE )
CONVE NTIONAL 14C AGE OF >45,660 YE AR S BP CONVE NTIONAL 14C AGE OF >44,540 YE AR S BP CONVE NTIONAL 14C AGE OF >46,140 YE AR S BP Qal5 Qal4 Qal3 Qal2 Qal1 Qls Qtm1 Qh D
E A
B C
0 100 Feet 0
30 Meters S cale vertical = horizontal FSAR UPDATE HUMBOLDT BAY ISFSI FIGURE 2.6-23 Geologic cross section D-D' across a trace of the Little Salmon fault zone at College of the Redwoods, 5 kilometers south of Humboldt Bay ISFSI site (after LACO Associates, 1999b, Figure 8). Location of cross section shown on Figure 2.6-18.
Revision 0 January 2006
50 km 0
30 mi 0
NOR TH AME R ICAN PLATE OR E GON CALIFOR NIA Cres cent City PACIFIC PLATE GOR DA PLATE IS FS I S ite 126°W 125°W 39°N 42°N 41°N 40°N 124°W 123°W 122°W 1850-1909 1910 -1973 1974-2002 MAGNITUDE S 5.0+
6.0+
7.0+
TIME PE R IODS 2
3
?
?
2 6
54 5
3 1
FSAR UPDATE HUMBOLDT BAY ISFSI FIGURE 2.6-24
Magnitude 5 and larger earthquakes for the period 1850 through April 2002 within 160 kilometers (100 miles) of the site. Earthquakes are scaled by magnitude and differentiated by time periods. Locations are listed in Table 2.6-4. Numbered earthquakes are included in Table 2.6-5. Earthquakes within 25 miles (40 kilometers) of the site are included in Figure 2.6-27.
10 0
MI LE S
(1 60 K
M)
(
DA TA L
IM IT)
S a
n A
n d
rea s Fa u
l t
Z o
n e
C a
s c
adi a
S ub du c
t i
o n
Z o
n e
Mendocino Fault Zone 25 MILE S (40K M)
Revision 0 January 2006
C' C
IS FS I S ite
?
?
50 km 0
30 mi 0
FSAR UPDATE HUMBOLDT BAY ISFSI FIGURE 2.6-25 Magnitude 3 and larger earthquakes from the period 1974 through April 2002 within 160 kilometers (100 miles) of the site. The locations of cross sections C-C' and D-D' (Figure 2.6-26) also are shown. Locations of magnitude 5 and larger earthquakes are listed in Table 2.6-12.
MAGNITUDE S 3.0+
4.0+
5.0+
6.0+
7.0+
20 30 30 30 30 10 50 40 30 20 10 50 40 30 20 10 50 40 30 20 10 Revision 0 January 2006 42°N 41°N 40°N 39°N 126°W 125°W 124°W 123°W 122°W 10 0
MI LE S
(D AT A
LI MI T)
D D'
0 10 mi 0
20 km 0
30 mi 0
50 km 100 90 80 70 60 50 40 30 20 10 0
0 50 100 150 200 250 300 0
10 20 30 40 50 60 DIS TANCE (K M)
DE PTH (K M)
DE PTH (MI)
C C '
Plate Interface Gorda Plate North American Plate Cas cadia S ubduction Zone S horeline IS FS I S ite 60 50 40 30 20 10 0
0 10 20 30 0
20 40 60 80 100 120 DIS TANCE (K M)
DE PTH (K M)
DE PTH (MI)
D D'
FSAR UPDATE
HUMBOLDT BAY ISFSI FIGURE 2.6-26 Seismic cross sections of magnitude 3 and larger earthquakes from the period 1974 through April 2002. The locations of cross sections C-C' and D-D' and earthquakes symbol legend are shown on Figure 2.6-25. The location of the plate interface (dashed line) is based on Figure 2.6-12 and Geomatrix (1994).
IS FS I S ite R upture Zone of 1992 Petrolia E Q Mad R iver Fault Zone Little S almon Fault Zone Mendocino Fault Zone North American Plate Gorda Plate Pacific Plate Plate Interface Revision 0 January 2006
B a
l d
M o
u n
t a
i n
Fault FSAR UPDATE HUMBOLDT BAY ISFSI
FIGURE 2.6-27 Magnitude 2 and larger earthquakes from the period 1974 through April 2002, within 40 kilometers (25 miles) of the site, and earthquakes of magnitude 5 and larger from 1850 through 1973 within the map boundary. Locations of magnitude 5 and greater earthquakes are listed in Table 2.6-4.
1850-1909 1910 -1973 1974-2000 MAGNITUDE S 5.0+
6.0+
7.0+
TIME PE R IODS 3.0+
2.0+
4.0+
Revision 0 January 2006 0
5 mi 0
10 km IS FS I S ite 124° 41° 45' 30' 15' 30' 45' E
E 5/1909,6/1935, 7/1938 12/1954 1932 1979 9/1930 1927 1980 1906 12/1994 10/1940 1987 6/1975 1875 1865 1860 1919 1908 1853 1/1923 12/1973 4/1992 11/1986 1947 1948 4/1992 1910 2
5 MI LE S
Little S almon Fault Zone S yncline R us s B ear R iver Fault Zone Fres hwater Fault Mad R iver Fault Zone Trinidad Grogan Fault Fault Fault E el R iver E atons R ough Fault Table B luff Fault
FSAR UPDATE HUMBOLDT BAY ISFSI FIGURE 2.6-28 Seismic cross section of magnitude 2 and larger earthquakes from the period 1974 through April 2002. The location of cross section E-E' is shown on Figure 2.6-27.
Fault locations are based on Figure 2.6-14; location of the plate interface (dashed line) is based on Figure 2.6-12 and Geomatrix (1994).
0 10 mi 0
20 km E
E '
MAGNITUDE S 2.0+
3.0+
4.0+
5.0+
6.0+
Bear R iver Fault Zone R uss Fault False Cape Fault Table Bluff Fault E el R iver S yncline Little S almon Fault Zone IS FS I S ite Mad R iver Fault Zone Gorda plate North American plate Plate Interface 1987 1975 1994 1992 aftershocks 50 45 40 35 30 25 20 15 10 5
0 0
5 10 15 20 2530 0
10 20 30 40 50 60 70 80 DIS TANCE (KM)
DE PTH (MI)
Revision 0 November 2005
Dis charge Canal IS FS I S ite B uhne Point FSAR UPDATE HUMBOLDT BAY ISFSI FIGURE 2.6-29
Oblique aerial view of the Humboldt Bay ISFSI site. (Photographs taken July 25, 2000, by W. D. Page.)
A) View toward the southwest.
B) View toward the west-southwest.
Dis charge Canal Humboldt B ay Power Plant Humboldt B ay Power Plant IS FS I S ite IS FS I S ite IS FS I S ite B uhne Point B uhne Point B uhne Point Humboldt B ay Power Plant Humboldt B ay Power Plant Revision 0 January 2006
SL-10 SL-11 SR-9 SR-7 SR-3 SR-6 SL-21 SR-5 SL-12 SR-1 WCC-18 A-22 A-5 P-16 A-3 A-2 A-6 A-4 A-11 RD-10 L-7 AW-1 RD13 L-6 P-17 A-8 A-9 A-10 B-16 WCC-12 A-14 B-45 B-18 B-19 P-11 B-47 RD-11 B-69 P-12 WCC-13 RD-19 WCC-14A WCC-14 B-26 P-15 AW-4 A-12 A-15 WCC-5 B-24 A-18 WCC-6 B-23 P-14 B-22 B-25 L-8 L-3 B-36 WCC-3 RD-5 B-16 WCC-2 RD-4 L-2 RD-14 RD-21 P-10 RD-20 RD-18 L-4 P-18 H-11 RD-3 B-44 B-27 A-17 B-21 P-6 B-65 WCC-4 AW-2 RD-12 H-5 H-9 B-1 A-20 B-3 A-21 B-4 L-5 B-5WCC-10 B-2 B-13 RD-2 H-6 RD-16 RD-23 B-15 P-9 B-11 B-10 H-2 P-5 WCC-7 B-20 WCC-9 WCC-9 B-9 P-4 D-5 H-1 D-12 P-8 B-14 B-12 B-6 P-2 P-3 B-7 WCC-11 RD-15 A-16A-19 RD-1 RD-24 AW-5 D-13 B-13 B-8 RD-12 AW-3 PLANT SITE A-7 A-1 EXPLANATION 0
200 400 600 m 0
500 1000 1500 2000 ft Post 1977 boring (ESA/WCC)
Pre 1978 borings (ESA)
Cross section Seismic lines; SR Series: ESA; SL Series: WCC N
FSAR UPDATE HUMBOLDT BAY ISFSI FIGURE 2.6-30 Locations of borings, cross sections, and seismic reflection lines used in the 1980 Woodward-Clyde Consultants report. (after Woodward-Clyde Consultants, 1980, Figure C-2). Cross section A-A' is shown on Figure 2.6-49 and cross section B-B' is shown on Figure 2.6-50.
Revision 0 January 2006 A
A' A
A' B
B' ISFSI Site
FSAR UPDATE HUMBOLDT BAY ISFSI FIGURE 2.6-31 GEOLOGIC MAP OF THE ISFSI SITE Revision 0 January 2006 Geologic cross sections shown on Figures 2.6-36, 2.6-44, and 2.6-55
FSAR UPDATE HUMBOLDT BAY ISFSI FIGURE 2.6-32 LOCATIONS OF GEOLOGIC TRENCHES AND BORINGS NEAR THE ISFSI SITE Revision 0 January 2006
J etties Humboldt Hill FSAR UPDATE HUMBOLDT BAY ISFSI FIGURE 2.6-33 Oblique aerial view looking northwest from above Humboldt Hill toward the entrance of Humboldt Bay. (Photograph taken July 25, 2000, by W. D. Page.)
IS FS I S ite IS FS I S ite B uhne Point B uhne Point Humboldt Hill J etties Revision 0 January 2006
E ureka IS FS I S ite FSAR UPDATE HUMBOLDT BAY ISFSI FIGURE 2.6-34 Comparison of the shoreline shown on 1858 and 1959 surveys. The 1959 shoreline is superimposed on the 1858 map to show the extensive coastal erosion and the retreat of Buhne Point that occurred prior to placement of riprap along the shoreline of Humboldt Bay.
0 0
1 Kilometer Coastline from U.S.Geological S urvey (1959) Fields Landing 7.5' Quadrangle, California 0.5 Mile Base map: U.S. Coast and Geodetic S urvey, 1858, Preliminary survey map of Humboldt, California.
E XPLANATION B uhne Point (1858)
B uhne Point (1959)
B uhne Point (1858)
B uhne Point (1959)
IS FS I S ite Revision 0 January 2006
FSAR UPDATE HUMBOLDT BAY ISFSI FIGURE 2.6-35 View looking west from Buhne Point showing the escarpment along the north side of the Buhne Point terrace and riprap along the shoreline of Humboldt Bay. (Photograph JW-2-1 taken March 9, 2000.)
Revision 0 January 2006
Note: Location of cross section is shown on Figure 2.6-31. Unit F location based on structure contour map (Figure 2.6-51).
Stratigraphy above Unit F based on correlation boreholes (ES76-P2, GMX99-2, ESA76-6) and trenches (11-T6a, 11-T6b, 11-T6c).
FSAR UPDATE HUMBOLDT BAY ISFSI FIGURE 2.6-36 GEOLOGIC CROSS SECTION X-X 5 Revision 0 January 2006
FSAR UPDATE HUMBOLDT BAY ISFSI FIGURE 2.6-37 View to east of Buhne Point terrace surface and ISFSI site. (Photographs JW-2-5 and JW-2-8 taken March 10, 2000.)
IS FS I S ite Unit 3
Revision 0 January 2006
(A)
(B)
FSAR UPDATE HUMBOLDT BAY ISFSI FIGURE 2.6-38 Oblique aerial photographs showing disturbance of Buhne Point terrace during trenching activities by Earth Sciences Associates (circa 1975). (A) View to the west-southwest. (B) View to the east-southeast.
Meteorlogical Tower Meteorlogical Tower Unit 3
Revision 0 January 2006
E ureka 80,000 APPR OXIMATE AGE (years) 310,000 +/- 70,000 160,000 +/- 40,000 600,000 +/- 100,000 1,100,000 +/- 200,000 FSAR UPDATE HUMBOLDT BAY ISFSI FIGURE 2.6-39 GENERALIZED STRATIGRAPHIC SECTION AT THE ISFSI SITE Revision 0 January 2006
E ureka Note: S ection is a composite from trenches excavated in the Buhne Point terrace.
UPPE R HOOKTON FOR MATION LOWE R HOOKTON FOR MATION Trench 11-T6b Trench 11-T6a Depth (meters)
FSAR UPDATE HUMBOLDT BAY ISFSI FIGURE 2.6-40 Stratigraphic section of the uppermost lower Hookton and upper Hookton Formation exposed in Woodward-Clyde Consultants' trenches 11-T6a, 11-T6b, and 11-T6c (after Woodward-Clyde Consultants, 1980, Figure C-28).
Revision 0 January 2006
FSAR UPDATE HUMBOLDT BAY ISFSI FIGURE 2.6-41 Outcrop of sand with interbedded silt (light layers) in sea cliff north of ISFSI site. Scale is in tenths of feet. View to the south-southeast. (Photograph JW-1-9 taken March 2, 2000.)
Revision 0 January 2006
DE S CR IPTION OF LITHOLOGIC UNITS Upper Hookton Formation (Late Pleistocene)
Unit 8:
8
Gleyed silty and sandy clay.Light gray to gray (10 YR 6/1 moist) and strong brown (7.5 YR 5/8 moist); some pebbles; moderately developed ped structure.
Unit 7:
7V
S ilty clay and clayey silt with some fine sand.S trong brown (7.5 YR 5/8 dry) with pinkish white (7.5 YR 8/2 dry) coatings along columnar and blocky ped faces; sand content increases with depth; very poorly stratified to massive; strongly oxidized; locally contains manganese-oxide nodules.
7IV
Moderately sorted fine sand with silt and some clay.Mottled very pale brown (10 YR 7/3 dry) and reddish yellow (7.5 YR 6/8 dry) with light gray (5 Y 7/1) to gray (5 Y 6/1) coatings along ped faces; predominantly subrounded to subangular quartz sand; locally contains stringers of manganese-oxide nodules; A/B indicates transition between A soil horizon, which has been stripped in most places (not mapped), and a Bt soil horizon developed on Unit 7V (see Table 2.6-6 for detailed soil profile description).
7IIIa
S ilty clay layer at the top of unit 7III.
7III
Fining-upward sequence of interbedded sand and silt. Dark grayish brown (2.5 YR 4/2) to gray (5 Y 5/2 moist) and strong brown (2.5 YR 5/2 moist) where oxidized; layers of well-sorted fine to medium sand interbeded with thin (<1 cm ) lenses of silt grading upwards to clayey silt and silty clay; locally contains fine gravel along the basal contact; locally contains woody material.
7II
S ilt interbedded with some fine sand and clayey silt.Dark gray; massive to weakly stratified layers of sandy silt and clayey silt with some lenses of fine sand and silty clay; bedding is discontinuous laterally.
7I
S ilty clay.Dark gray; generally massive.
E XPLANATION Lithologic contact; solid line where resolution is less than 2 cm, dashed line where 2 to 5 cm; dotted line where 5 to15 cm.
Fracture NOTE S :
- Values correspond to station numbers on original log of Trench 11-T6a (Woodward Clyde Consultants, 1980, Figure C-29, R eference 1).
- Values correspond to station numbers on Trench GMX-T1.
S ee Figure 2.6-31 for locations of trenches and IS FS I site.
Younger Older FSAR UPDATE HUMBOLDT BAY ISFSI FIGURE 2.6-42 COMPOSITE LOG OF TRENCHES WCC-11T6a AND GMX-T1 Revision 0 January 2006 70 75 80 85 90 95 100 80 70 60 50 40 30 S outhwest Wall Distance (meters)*
N75°W Distance (feet)**
7I 7IIIa 7III 7III 7III 7II 7II 7V 7V 8
7IV 7IV 20 10 0
-10
-20 30 40 50 15 14 13 12 109 8
7 6
?
?
?
?
?
?
Covered (plywood)
Disturbed S oil/Fill Disturbed S oil/Fill Fracture lined with roots N35E ; 88NW Fractures lined with roots N47W 83S W N83E 86NW N75E 88N Fracture lined with fine sand N5S E ; 83NW Approximate intersection with NW wall of Trench GMX-T2 Trench WWC-11-T6a Trench GMX-T1 Trench WWC-11-T6a
?
?
?
E levation (feet above MLLW)
E levation (meters above MLLW)
50 40 30 20 5
0 10 15 20 25 30 35 40 45 50 1)
N87E ;88S E - 2mm - wide, planar fracture lined with light gray clayey silt 2)
N77E ;88S E - 2mm - wide, planar fracture lined with light gray clayey silt 3)
N29W;73NE - 2mm - wide, planar fracture lined with light gray clayey silt 4)
N84E ; ~90 - irregular fracture 5)
Pair of conjugate fractures; N87E ;90 and N29W;~70NE 6)
N80E ;N88E - planar fracture lined with light gray clayey silt DE S CR IPTION OF LITHOLOGIC UNITS Upper Hookton Formation (Late Pleistocene)
Unit 7:
7V
S ilty clay and clayey silt with some fine sand.
S trong brown (7.5 YR 5/8 dry) with pinkish white (7.5 YR 8/2 dry) coatings along columnar and blocky ped faces; sand content increases with depth; very poorly stratified to massive; strongly oxidized; locally contains manganese-oxide nodules.
7IV
Moderately sorted fine sand with silt and some clay.
Mottled very pale brown (10 YR 7/3 dry) and reddish yellow (7.5 YR 6/8 dry) with light gray (5 Y 7/1) to gray (5 Y 6/1) coatings along ped faces; predominantly subrounded to subangular quartz sand; locally contains stringers of manganese-oxide nodules; A/B indicates transition between A soil horizon, which has been stripped in most places (not mapped), and a Bt soil horizon developed on Unit 7V (see Table 4-1 for detailed soil profile description).
7IIIa
S ilty clay layer at the top of unit 7III.
7III
Fining-upward sequence of interbedded sand and silt.
Dark grayish brown (2.5 YR 4/2) to gray (5 Y 5/2 moist) and strong brown (2.5 YR 5/2 moist) where oxidized; layers of well-sorted fine to medium sand interbedded with thin (<1 cm ) lenses of silt grading upward to clayey silt and silty clay; locally contains fine gravel along the basal contact; locally contains woody material.
7II
S ilt interbedded with some fine sand and clayey silt.
Dark gray; massive to weakly stratified layers of sandy silt and clayey silt with some lenses of fine sand and silty clay; bedding is discontinuous laterally.
7I
S ilty clay.
Dark gray; generally massive.
E XPLANATION Lithologic contact; solid line where resolution is less than 2 cm, dashed line where 2 to 5 cm; dotted line where 5 to 15 cm.
Very abrupt to abrupt soil horizon boundary (<1 mm to 2.5 cm resolution).
Clear to gradual soil horizon boundary (>2.5 cm to 12.5 cm resolution).
Fracture R adiocarbon sample Note:
S ee Figure 4-2 for location of trench and boundaries of IS FS I site.
Younger Older 10 10 12 13 9
8 2
Bottom of trench Top of trench Top of trench Bottom of trench Bottom of trench Top of trench Top of trench Oxidized zone 2" PVC conduit Wires Backfill Trench WCC-11-T6a Area of caving E dge of WCC trench Fill Bend in Trench Anchor for ME T. Tower C able S tay A/Bt Fill Gravelly fill S oil Profile (S ee Figure 4-11)
Wood sample FHS 00/8-1 from opposite wall > 45,700 BP Fill N24E N37E N37E 200 190 180 170 160 150 140 130 120 110 100 90 80 70 60 50 40 30 20 10 0
A/Bt A/Bt Fill Fill Backfill Trench E S A BP-1 Fill 02 IV R educed Oxidized Oxidized
?
?
Trend of channel margin N22W+/-5° Base of oxidation zone Base of oxidation lower zone Top of lower oxidation zone Base of upper oxidation zone Channel trend is ~N15W+/-5° 140 Apparent bedding in channel deposits Base of oxidation N45E ; 84S E N78E ; 84S N88E ;90 S and-filled fracture N74E ;87N N17E ;84NW N8W;88S W Fractures lined with compressed roots N64E ; 90 1
4 3
5 6
7IIIa 7IIIa 7III 7III 7V 7III 7III 7V 7V 7II 7I 7I 7I 7I 7I 7II 7II 7II 7II 7IV 7IV 7IV 7IIIa 7IV Base of oxidation zone Base of oxidation zone E levation (feet above MLLW)
E levation (meters above MLLW)
Distance (meters)
Northwest Wall Distance (feet)
FSAR UPDATE HUMBOLDT BAY ISFSI FIGURE 2.6-43 LOG OF TRENCH GMX-72 Revision 0 January 2006
Note: Unit F location based on contour map (Figure 2.6-51).
Stratigraphy above Unit F based on correlation of boreholes (GMX99-2 through -5) and trenches, and outcrop exposure in bluff.
FSAR UPDATE HUMBOLDT BAY ISFSI FIGURE 2.6-44 GEOLOGIC CROSS SECTION Y-Y Revision 0 January 2006