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
C a s c a d ia OR E G ON 42°N 10 0 C A L IF OR NIA M
IL C res c ent C ity ES (1
60 KM S ubd DA NOR T H A ME R IC A N P L A T E ) (
u c ti o n TA G OR DA L I MI T PLATE 2 41°N Zo )
ne 25 MIL E S (40K M) 6 45 IS F S I S ite 1
MAG NIT UDE S Me nd oc ino F au lt Zo 5 3 ne 5.0+
6.0+
40°N 7.0+
Sa n
P A C IF IC P L A T E ?
e T IME P E R IODS Zo n 1850-1909 A nd r e a s F a u l t 0 30 mi 1910 -1973 0 50 km
?
1974-2002 39°N 126°W 125°W 124°W 123°W 122°W 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.
Revision 0 January 2006
10 10 42°N 0 MI LE S
50 (D AT 40 A LI MI 30 T) 20 D'
10 41°N C C' 50 40 IS F S I S ite 30 20 10 MA G NIT UDE S 40°N D 3.0+
50 4.0+
40 ?
5.0+
30 0 30 mi 6.0+
20 7.0+
10 0 50 km
?
39°N 20 126°W 30 125°W 30 124°W 30 123°W 30 122°W 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.
Revision 0 January 2006
C as c adia S ubduc tion S horeline IS F S I S ite North A meric an Zone P late C C' 0 0 10 10 20 P la te DE P T H (K M) 30 In te rf a ce 20 DE P T H (MI) 40 50 30 60 G orda P late 40 70 80 50 90 100 60 0 50 100 150 200 250 300 DIS T A NC E (K M) 0 30 mi 0 50 km L ittle S almon IS F S I Mendoc ino F ault Zone S ite F ault R upture Zone of 1992 P etrolia Mad R iver Zone F ault Zone EQ D D' 0 0 North A meric an P late 10 P ac ific P late P late Inte rfac e 10 20 DE P T H (K M) DE P T H (MI) 30 20 G orda P late 40 30 50 60 0 20 40 60 80 100 120 DIS T A NC E (K M) 0 10 mi 0 20 km 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).
Revision 0 January 2006
1980 E S
LE MI Tr in id 5/1909,6/1935, 25 ad 1927 7/1938 41° 1906 12/1954 9/1930 Fa u lt o
B a ld M G ro 1979 un t ga n a in 1910 F a u lt 1860 F au lt 1919 1853 1865 1908 Ma d
45' 1932 IS F S I S ite R iv er 12/1994 1875 Fa u lt T able B luff Zo F ault ne F re sh 12/1973 Ee l wa R iv te r er S yn c lin e Fa u lt E atons R ough L it F ault tl e 6/1975 Sa lm 1/1923 on Fa 1948 u lt 30' R us s Zo ne F a u lt 10/1940 Be ar R iv er 1947 4/1992 F au lt Zon E e 11/1986 1987 4/1992 30' 15' 124° 45' 0 5 mi 0 10 km MAG NIT UDE S T IME P E R IODS 2.0+ 6.0+ 1850-1909 3.0+
4.0+ 7.0+ 1910 -1973 5.0+ 1974-2000 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.
Revision 0 January 2006
F als e C ape F ault E el R iver S yncline Little S almon B ear R iver F ault Zone Mad R iver F ault Zone T able B luff F ault IS F S I S ite F ault Zone E R us s F ault E' 0 0 5
1992 5 10 afters hocks North American plate 1987 15 10 P late Interface DE P T H (K M) DE P T H (MI) 20 1994 15 25 1975 30 20 35 G orda plate 40 2530 45 50 0 10 20 30 40 50 60 70 80 DIS T ANC E (K M) 0 10 mi MAG NIT UDE S 0 20 km 2.0+
3.0+
4.0+
5.0+
6.0+
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).
Revision 0 November 2005
Humboldt B ay P ower P lant IS F S I S ite B uhne P oint Dis c harge C anal A) V iew toward the s outhwes t.
Humboldt B ay P ower P lant B uhne P oint IS F S I S ite B ) V iew toward the wes t-s outhwes t.
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.)
Revision 0 January 2006
ISFSI Site B-65 WCC-7 A-16 WCC-11 A-19 WCC-9 RD-15 B-20 N
B' P-5 B-3 B-9 SR-7 P-3 B-8 B-13 A-21 P-2 SR-5 WCC-9 B-1 B-7 H-2 SR-6 B-4 B-10 B-6 L-5 D-13 P-4 P-6 RD-12 SR-9 H-9 B-12 RD-12 AW-3 B-5 B-11 A-20 WCC-10 D-5 D-12 SL-21 B-14 H-5 A-17 SR-3 P-9 B-2 AW-5 AW-2 B-15 B-21 B-13 RD-2 PLANT P-8 SITE H-1 RD-16 RD-1 RD-23 H-6 WCC-2 P-10 RD-3 RD-24 B WCC-4 B-16 RD-4 RD-5 SL-10 WCC-3 L-2 RD-21 WCC-5 B-36 SL-11 RD-14 A-15 B-24 B-23 A-12 L-3 A-18 P-14 RD-20 B-25 AW-4 B-22 B-27 WCC-6 L-8 P-11 B-26 B-44 RD-11 P-15 B-69 RD-18 WCC-14A P-12 B-47 WCC-13 WCC-14 RD-19 WCC-12 A-14 L-4 B-45 B-18 B-19 H-11 B-16 SR-1 P-18 SL-12 AW-1 A-8 A-9 RD13 P-17 A-10 L-6 RD-10 L-7 A-11 A-5 A-2 P-16 A-7 A' EXPLANATION A-1 WCC-18 A-3 Post 1977 boring (ESA/WCC)
A-4 A-6 A A-22 Pre 1978 borings (ESA)
A A' Cross section Seismic lines; SR Series: ESA; SL Series: WCC 0 500 1000 1500 2000 ft 0 200 400 600 m 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
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 B uhne P oint IS F S I S ite 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.)
Revision 0 January 2006
B uhne P oint (1858)
B uhne P oint (1959)
IS F S I S ite E ureka B as e map: U.S . C oas t and G eodetic S urvey, 1858, P reliminary s urvey map of Humboldt, C alifornia. 0 0.5 Mile 0 1 K ilometer E XP LANAT ION C oas tline from U.S .G eological S urvey (1959) F ields Landing 7.5' Quadrangle, C alifornia 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.
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)
IS F S I Unit S ite 3 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
(A ) (B )
Meteorlogic al Meteorlogic al T ower T ower Unit 3
FSAR UPDATE HUMBOLDT BAY ISFSI FIGURE 2.6-38 Oblique aerial photographs showing disturbance of Buhne Point terrace during trenching activiti Sciences Associates (circa 1975). (A) View to the west-southwest. (B) View to the east-sout Revision 0
AP P R OXIMAT E AG E (years )
³ 80,000
³ 160,000 +/- 40,000 310,000 +/- 70,000 E ureka 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
Depth (meters )
Trench 11-T 6a F OR MAT ION UP P E R HOOK TON LOWE R HOOK TON F OR MAT ION E ureka Trench 11-T 6b Note: S ection is a compos ite from trenches excavated in the B uhne P oint terrace.
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
Northwest Wall Distance (feet) 200 190 180 170 160 150 140 130 120 110 100 90 80 70 50 B end in T rench N37E S oil P rofile N24E (S ee Figure 4-11)
G ravelly fill Top of trench Top of trench Top of trench Fill 2" P VC conduit Wires Fill E dge of 7V WC C trench Fill A/Bt 7V A/Bt 40 Apparent bedding in channel deposits ?
E levation (feet above ML L W )
7V ? C hannel trend is ~N15W+/-5° 140 7 IV Base of upper oxidation zone 7 IV 7 III a Top of lower oxidation zone Base of oxidation 7 III a Trend of channel Base of Area 7 III margin N22W+/-5° Base of oxidation 7 III Oxidized zone of oxidation zone 7 III zone Base of caving oxidation zone IV Base of oxidation N45E ; 84S E 7 II lower zone 7 II 30 7 II N78E ; 84S Wood sample N64E ; 90 FHS 00/8-1 from opposite wall > 45,700 BP 7I 7I 7I Backfill Trench Bottom of trench WC C T6a Bottom of trench 20 0 5 10 15 20 25 30 35 Distance (meters)
DE S C R IP TION OF LITHOLOG IC UNITS E XP LANATION Upper Hookton Formation (Late P leistocene) Lithologic contact; solid line where resolution is less th dashed line where 2 to 5 cm; dotted line where 5 to 15 Unit 7:
Very abrupt to abrupt soil horizon boundary (<1 mm to Y ounger 7V S ilty clay and clayey silt with some fine sand. resolution).
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; C lear to gradual soil horizon boundary (>2.5 cm to 12.
strongly oxidized; locally contains manganese-oxide nodules. resolution).
7 IV Moderately sorted fine sand with silt and some clay. Fracture 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 R adiocarbon sample 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 7 V (see Table 4-1 for detailed soil profile Note:
description). S ee Figure 4-2 for location of trench and boundaries o site.
7 IIIa S ilty clay layer at the top of unit 7 III .
7 III 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.
7 II 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.
O lder 7I S ilty clay.
Dark gray; generally massive.
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