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SITE CONDITIONS EVALUATION

3-1Pacific Gas and Electric Company Figure

Locations of the Free-FieldGround-Motion Stations at the DCPP

Ch11.GEO.DCPP.TR.14.06 R0

--1 -~~~ #"

/ l:lOKII I SII'IITC>IYAAD

;f I

.. [TlDADlOCICAl • TOW~II

eii[AKWATUIS

0 ~ 400 - 1:100 1100

SCAlE IN FEET

ORIGINAL INSTRUMENT LOCATIONS

VERTICAL SENSOR

+ BIAXIAL SENSOR

~TRIAXIAL SENSOR

p PRA

R RSR

T TRIGGER

e NEW CONSOUOATEO SEISMIC MONITORING SYSTEM 'MIAXIAL SENSORS. SENSORS NUMBERED PER STATION 10 IN TABLE Z; " B" IHIOCATES BASIC SYSTEM.

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SITE CONDITIONS EVALUATION

3-2Pacific Gas and Electric Company Figure

Comparison of the MeanShear-Wave Velocity Profiles

Ch11.GEO.DCPP.TR.14.06 R0

- Power block foundation (elev. 53ft)

- Turbine bldg foundation (elev. 61 ft)

- Free-Field ESTA28

- Free-Field ESTA27

0 ~ ~ ~ .... - J

\ I

"' .,r'll \

20 I' """'

,_ ~ " ~ ~ ~ I' , ~ "' }

II ' 1 i.,oj

40 " ~ .,.

I ~ '/ ""' - ~ II \ ~ E I~ ' ' -..c 60 "'1111 Ill.. ' ' , - .... -.._ '\. 1'\. ' a.

Q)

""" 1\. \. "",..,.

0 ~ ' ' " 80 ' ' ·' 1 I "'IIII ... ' ~ ' l\: \

~ ~' ' 100 ~ '\. ~

' ~·I\. ' ~~ \ I\. ' 120 '

0 200 400 600 800 1000 1200 1400 1600 1800 Shear-wave Velocity (m/s)

m

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SITE CONDITIONS EVALUATION

3-3Pacific Gas and Electric Company Figure

Factor to Correct for the Differences in the VS30Values at ESTA27 and ESTA28 Based on the

VS30 Scaling in the NGA-West2 GMPEs

Ch11.GEO.DCPP.TR.14.06 R0

-0.05-1-- Average Amplification CJ) +-' ----- for 570 ms/ to 753 m/s - •• c from GMPEs .v- ." :::J -0.1 - r-z 1-- rr- ..._, _J v 1"11 ._

•• ,r -~ II c ·-§ -0.15

~ +-'

J rn u ~ -0.2 0.. ,/I E <(

"' -0.25 rv I

-0.3 •• 1-•• - I

0.1 1 10 100 Frequency (Hz)

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SITE CONDITIONS EVALUATION

3-4Pacific Gas and Electric Company Figure

Mean Event-Specific Residuals for the DCPPRelative to the ESTA28 Reference Rock Site

Condition with VS30 = 750 m/s

Note: Epistemic uncertainty (5% and 95% confidence levels) is shown by the dashed lines.

Ch11.GEO.DCPP.TR.14.06 R0

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SITE CONDITIONS EVALUATION

3-5Pacific Gas and Electric Company Figure

Site Amplification (760–1200 m/s) Given inRIL 12-01 (from Table 5-7 in NRC, 2012)

Ch11.GEO.DCPP.TR.14.06 R0

1.00 r-1--... -.0.90 "' U) ........ - "" E 0.80 ......-0 '\

~I' 0 !'.... r- /

,.,..

~ 0.70 0 -;;; 0.60 -E 0 0.50 c.o t:::.- 0.40 c 0 ~ 0.30 (.) -'a. 0.20 I

RIL 12-01 I

I - I E <{ 0.10

0.00 0.1 1 10 100

Frequency (Hz)

m

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SITE CONDITIONS EVALUATION

3-6Pacific Gas and Electric Company Figure

Comparison of the Velocity Profiles Used to Compute the Amplification from 760 m/s to 1200 m/s Used in the RIL 12-01

(NRC 760 and NRC 1200) with the Updated Site-Specific Velocity Profiles from PGEQ-PR-16 for the Reference

Free-Field Site (ESTA28, VS30 = 750 m/s) and the Power Block Foundation (VS30 = 1260 m/s)

Ch11.GEO.DCPP.TR.14.06 R0

0 -~ :.. , 20 ...... ~ '" / . ;> 40

~, .... ~ c ~ 60 ~

' ..... -

80 ' ~ --1 ·~

~ E' - ~ £ 100 a. ~

' ~ Q)

0

~ 120

--- NRC 760

140 - NRC 1200

~ Powerblock foundation (elev 53ft)

160 ---+--- Free-Field ESTA28

180

200 0 200 400 600 800 1000 1200 1400 1600 1800

VS (m/s)

m I

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SITE CONDITIONS EVALUATION

3-7Pacific Gas and Electric Company Figure

Site Amplification (760–1200 m/s)Including the Adjustment for Z1 Differences

Ch11.GEO.DCPP.TR.14.06 R0

- RIL 12-01

Adjusted for Z1 Differences

Smoothed Model

1 10 Frequency (Hz)

100

I