ML15070A606

Final Response to Request for Information Pursuant to 10 CFR 50.54(f) Regarding Recommendation 2.1 Flooding. Part 2 of 2

ML15070A606
Person / Time
Site:	Diablo Canyon
Issue date:	03/11/2015
From:	Pacific Gas & Electric Co
To:	Office of Nuclear Reactor Regulation
References
DCL-15-034
Download: ML15070A606 (53)

Text

6.0 ADDITIONAL ACTIONS None. 6-1 PG&E Letter DCL-15-034 Enclosure 1

7.0 REFERENCES

PG&E Letter DCL-15-034 Enclosure 1 ANSI/ANS, 1992. American Nuclear Society (ANSI/ANS), "Determining Design Basis Flooding at Power Reactor Sites ANS 2.8-1992," La Grange Park, Illinois, 1992. Borgman and Resio, 1982. Borgman, L.E. and D.T. Resio, "Extremal Analysis of Wave Hindcasts for the Diablo Canyon Area, California." 1982. Borgman and Strange, 1982. Borgman, L.E. and R.R. Strange, "Extremal Analysis of Wave Hindcasts for the Diablo Canyon Area, California." 1984. Borgman and Strange, 1982. Borgman, L.E. and R.R. Strange, "Extremal Analysis of Wave Hind casts for the Diablo Canyon Area, California (Addendum)." 1984. CCC, 2013. California Coastal Commission, "California Coastal Commission Draft Sea-Level Rise Policy Guidance", Public Review Draft, October 14, 2013. CFR, 2014. Code of Federal Regulations.

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Simulation of Short-Crested Waves with SWAN." 2014. Ellsworth, 2003. Ellsworth, W. "Appendix 0-Magnitude and area data for strike slip earthquakes, in Working Group on California Earthquake Probabilities, Earthquake probabilities in the San Francisco Bay region-2002-2031", U.S. Geological Survey Open-File Report 03-214, 6 p. 2003. FEMA, 2011. Federal Emergency Management Agency (FEMA). August 2011. "Coastal Construction Manual, Principles and Practices of Planning, Siting, Designing, Constructing, and Maintaining Residential Buildings in Coastal Areas," FEMA P-55. FEMA, 2012. Federal Emergency Management Agency (FEMA). "Guidelines for Design of Structures for Vertical Evacuation from Tsunamis," FEMA P-646, Second Edition. April 2012. Fisher et al., 2005. Fisher, M.A., Normark, W. R., Greene, H. A., Lee, H. J. and Sliter, R. W. "Geology and Tsunamigenic Potential of Submarine Landslides in Santa Barbara Channel, Southern California," Marine Geology, 224, pp. 1-22. 2005 FL0-20, 2014. FL0-2D Software, Inc. FL0-2D Software Version Pro, Build No. 14.08.09.

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.oce.uri.edu/-grilli/Grillietal CD2013.pdf Grilli et al, 2013b. Grilli, S. T., Harris, J. C., Tajalibakhsh, T., Masterlark, T. L., Kyriakopoulos, C., Kirby, J. T., and Shi F. "Numerical simulation of the 2011 Tohoku tsunami based on a new transient FEM co-seismic source: Comparison to far-and near-field observations." Pure and Applied Geophysics, 170, 1333-1359.

2013. Grilli et al, 2014. Grilli S. T., O'Reilly C., Harris J. C., Tajalli-Bakhsh T., Tehranirad B., Banihashemi S., Kirby J. T., Baxter C. D. P., Eggeling T., MaG., and Shi, F. "Modeling of SMF tsunami hazard along the upper US East Coast: Detailed impact around Ocean City, MD." Natural Hazards. 2014. Hwang, 1975. Li-San Hwang, et al., "Earthquake Generated Water Waves at the Diablo Canyon Power Plant," (Part Two), 1975. Hanson, 2004. Hanson, K. L., Lettis, W. R., Mclaren, M. K., Savage, W. U., and Hall, N. T. "Style and rate of Quaternary deformation of the Hosgri Fault Zone, offshore southcentral California", U.S. Geological Survey Bulletin 1995-BB, pp. 33. 2004. lchinose, 2007. lchinose, G., Somerville, P., Thio, H. K., Graves, R., and O'Connell, D. "Rupture process of the 1964 Prince William Sound, Alaska, earthquake from the combined inversion of seismic, tsunami, and geodetic data." J. Geophys. Res., 112(B7). 2007. Johnson et al, 1996. Johnson, J. M., Satake, K., Holdahl, S. R., and Sauber, J. "The 1964 Prince William Sound earthquake:

Joint inversion of tsunami and geodetic data." J. Geophys. Res., 101(B1), 523-532. 1996. Johnson, 2012. Johnson, S. Y. and Watt, J. T. "Influence of fault trend, bends, and convergence on shallow structure and geomorphology of the Hosgri strike-slip fault, offshore central California", Geosphere, 8(6), pp. 1632-1656.

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.nws.noaa.gov/hdsc/pfds/pfds_map_cont.html?bkmrk=ca data accessed February 28, 2013. NOAA, 2013a. NOAA, National Oceanic and Atmospheric Administration, National Weather Service (NOAA). "Station Snow Climatology, Stations in California," Snow Climatology Data, National Climatology Data Center (NCDC), Website http://www

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.jsp accessed February 25 , 2013. NOAA, 2013b. National Oceanic and Atmospheric Administration, National Weather Service (NOAA). "Global Historical Climatology Network-Daily Data," Snow Climatology Data, National Climatology Data Center (NCDC), Website http://www.ncdc.noaa.gov/most-popular-data#ghcn accessed February 27, 2013. NOAA, 2014. National Oceanic and Atmospheric Administration, National Weather Service (NOAA). "Global Historical Tsunami Database ". Website http://www

.ngdc.noaa.gov/hazard/tsu_db.shtml accessed July 9, 2014. NRC, 1975. U.S. Nuclear Regulatory Commission (NRC), "Supplement No. 1 to the Safety Evaluation Report by the Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission in the Matter of Pacific Gas and Electric Company Diablo Canyon Nuclear Power Station, Units 1 and 2 Docket Nos. 50-275 and 50-323," Washington, D.C., January 31, 1975. NRC, 1976a. U.S. Nuclear Regulatory Commission (NRC), "Regulatory Guide 1.102-Flood Protection for Nuclear Power Plants", Revision 1, September 1976. NRC, 197Gb. U.S. Nuclear Regulatory Commission (NRC), "Supplement No. 5 to the Safety Evaluation Report by the Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission in the Matter of Pacific Gas and Electric Company Diablo Canyon Nuclear Power 7-3 PG&E Letter DCL-15-034 Enclosure 1 Station, Units 1 and 2 Docket Nos. 50-275 and 50-323," Washington, D.C., September 10, 1976. NRC, 1977. United States Nuclear Regulatory Commission (NRC), "Design Basis Floods for Nuclear Power Plants," Regulatory Guide 1.59, Revision 2, Washington, D.C., August 1977. NRC, 1978a. United States Nuclear Regulatory Commission (NRC), "Standard Format and Content of Safety Analysis Reports for Nuclear Power Plants," Regulatory Guide 1.70, Revision 3, Washington, D.C., 1978. NRC, 1978b. United States Nuclear Regulatory Commission (NRC), " Supplement No. 8 to the Safety Evaluation Report for Pacific Gas and Electric Company Diablo Canyon Nuclear Power Plants, Units 1 and 2 (Docket Nos. 50-275 and 50-323)," Washington, D.C., November 15, 1978. NRC, 1984. United States Nuclear Regulatory Commission (NRC), " Supplement 17 to the Safety Evaluation Report for Pacific Gas and Electric Company's Application for licenses to operate Diablo Canyon Nuclear Power Plants, Units 1 and 2 (Docket Nos. 50-275 and 50-323)," Washington, D.C., February 1984. NRC, 1999. United States Nuclear Regulatory Commission (NRC), "Issuance of Amendments for Diablo Canyon Nuclear Power Plant, Unit No. 1 (TAC No. M97914) and Unit No.2 (TAC No. M97915)," Washington, D.C., March 26, 1999. NRC, 2007. United States Nuclear Regulatory Commission (NRC), "Standard Review Plan for the Review of Safety Analysis Reports for Nuclear Power Plants: LWR Edition," NUREG-0800, Washington, D.C., March, 2007. NRC, 2009. United States Nuclear Regulatory Commission (NRC), "Tsunami Hazard Assessment at Nuclear Power Plant Sites in the United States of America-Final Report," NUREG/CR-6966, PNNL-17397, Richland, WA, March 2009. NRC, 2011. United States Nuclear Regulatory Commission (NRC), "Design-Basis Flood Estimation for Site Characterization at Nuclear Power Plants in the United States of America," NUREG/CR-7046, Washington, D.C., November, 2011. NRC, 2012a. United States Nuclear Regulatory Commission, Letter to Licensees, "Request for Information Pursuant to Title 10 of the Code of Federal Regulations 50.54(f) Regarding Recommendations 2.1, 2.3, and 9.3 of the Near Term Task Force Review of Insights from the Fukushima Dai-ichi Accident." March 12, 2012. NRC, 2012b. United States Nuclear Regulatory Commission (NRC), "Endorsement of Nuclear Energy Institute (NEI) 12-07, 'Guidelines for Performing Verification Walkdowns of Plant Flood Protection Features,"'

May 31,2012. 7-4 PG&E Letter DCL-15-034 Enclosure 1 NRC, 2012c. United States Nuclear Regulatory Commission (NRC), "Guidance for Performing the Integrated Assessment for External Flooding," Interim Staff Guidance, Revision 0. JLD-ISG-2012-05, November 30, 2012. NRC, 2013. United States Nuclear Regulatory Commission (NRC), "Guidance for Performing a Tsunami, Surge and Seiche Flooding Safety Analysis Revision 0," Japan Lessons-Learned Project Directorate Interim Staff Guidance, JLD-ISG-2012-06, January 4, 2013. NRC, 2014. United States Nuclear Regulatory Commission (NRC), "Diablo Canyon Power Plant-Staff Assessment of the Flooding Walkdown Report Supporting Implementation of Term Task Force Recommendation

2.3 Related

tot he Fukushima Dai-lchi Nuclear Power Plant Accident (TAC Nos. MF0221 and MF0222)," ADAMS Accession No. ML 14136A194, June 23, 2014. NRC, 1994. National Research Council (NRC), "Estimating Bounds on Extreme Precipitation Events," National Academy Press, Washington, 1994. Okada, 1985. Okada, Y. "Surface deformation due to shear and tensile faults in a half-space." Bull. Seismological Soc. Amer., 75(4), 1135-1154.

1985. Petersen et al, 2008. Petersen, M.D., Frankel, A. D., Harmsen, S.C., Mueller, C. S., Haller, K. M., Wheeler, R. L., Wesson, R. L., Zeng, Y., Boyd, 0. S., Perkins, D. M., Luco, N., Field, E. H., Wills, C. J., and Rukstales, K. S. "Documentation for the 2008 Update of the United States National Seismic Hazard Maps." U.S. Geological Survey Open-File Report 2008-1128, 61. 2008. PGE, 2012a. PG&E Letter DCL-12-059, "Pacific Gas and Electric Company's Response to NRC Request for Information Pursuant to 10 CFR 50.54(f) Regarding the Flooding Aspects of Recommendations 2.1 and 2.3 of the Near-Term Task Force Review of Insights from the Fukushima Dai-ichi Accident," June 7, 2012. PGE, 2012b. PG&E Letter DCL-12-114, "Final Response to Request for Information Pursuant to 10 CFR 50.54(f) Regarding Recommendation 2.3 Flooding," November 27, 2012. PGE, 2013. Pacific Gas and Electric Company (PG&E), "Diablo Canyon Power Plant Units 1 and 2 Final Safety Analysis Report Update." Revision 21, Docket No. 50-275, 50-323, September 2013. PGE, 2014. Pacific Gas and Electric Company (PG&E). "Central Coastal California Seismic Imaging Project Report." Available at Agencywide Documents Access and Management System (ADAMS) Accession Nos. ML 14260A024 through ML 14260A069.

September 2014. Prochaska et al, 2008. Adam B Prochaska, Paul M. Santi, Jerry D. Higgins, Susan H. Cannon. "A study of methods to estimate debris flow velocity, Landslides," DOl 10.1007 /s1 0346-008-0137-0 © Springer-Verlag 2008. Resio, 1982. Resio, D.T., "Report On Wave Climatology For Diablo Canyon, California" 1982. 7-5 PG&E Letter DCL-15-034 Enclosure 1 Ross et al, 2013. Ross, S.L., Jones, L.M., Miller, Kevin, P., K.A., Wein, A., Wilson, Ri.l., Bahng, B., Barberopoulou, A., Borrero, J.C., Brosnan, D.M., Bwarie, J.T., Geist, E.L., Johnson, L.A., Kirby, S.H., Knight, W.R., Long, K., Lynett, P., Mortensen, C.E., Nicolsky, D.J., Perry, S.C., Plumlee, G.S., Real, C.R., Ryan, K., Suleimani, E., Thio, H., Titov, V.V., Whitmore, P.M. and Wood, N.J., SAFRR (Science Application for Risk Reduction)

Tsunami Scenario-Executive Summary and

Introduction:

U.S. Geological Survey Open-File Report 2013-1170-A, in Ross, S.L., and Jones, L.M., eds., The SAFRR (Science Application for Risk Reduction)

Tsunami Scenario:

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Shi et al, 2012. Shi, F., Kirby, J. T., Harris, J. C., Geiman, J. D., and Grilli, S. T., "A high-order adaptive time-stepping TVD solver for boussinesq modeling of breaking waves and coastal inundation." Ocean Modeling, 43-44, 36-51. 2012. Strange and Graham, 1982. Strange, R.R. and N. Graham, "A Hindcast of Severe Storm Waves at Diablo Canyon, California." 1982. Suito, 2009. Suito H., and Freymueller, J. T .. "A viscoelastic and afterslip postseismic deformation model for the 1964 Alaska earthquake." J. Geophys. Res., 114(B11404).

2009. Tappin et al, 2014. Tappin D. R., Grilli, S. T., Harris, J. C., Geller, R. G., Masterlark T., Kirby, J. T., Shi, F., Ma, G., Thingbaijam K. K. S, and Mai, P. M. "Did a submarine landslide contribute to the 2011 Tohoku tsunami?" Marine Geology. 2014. USACE, 1984. U.S. Army Corps of Engineers (USAGE). "Drainage and Erosion Control Mobilization Construction." 1984. USACE, 1998. U.S. Army Corps of Engineers (USAGE). "Engineering Manual EM-111 0-2-1406 Runoff from Snowmelt." 1998. USACE, 2008. U.S. Army Corps of Engineers (USAGE). "Coastal Engineering Manual." EM-111 0-2-1100 (Part II). August 1, 2008 (Change 2). 2008. USACE, 201 Oa. U.S Army Corps of Engineers (USAGE). "Hydrologic Modeling System, HMS Computer Software," Version 3.5. Hydrologic Engineering Center, Davis, CA. 2010. USACE, 201 Ob. U.S Army Corps of Engineers (USAGE). "River Analysis System, HEC-RAS Computer Software," Version 4.1.0. Hydrologic Engineering Center, Davis, CA. 2010. USBR, 1992. U.S. Bureau of Reclamation (USBR). "Flood Hydrology Manual," Water Resource Technical Publication.

Denver, CO. 1992. USGS, 2013a. U.S. Geological Survey (USGS). "USGS Surface-Water Data for California," Website, http://waterdata.usgs

.gov/ca/nwis/sw accessed January/February 2013. USGS, 2013b. U.S. Geological Survey (USGS)/California Geological Survey (CGS). 'The Search for Geologic Evidence of Distant-Source Tsunamis Using New Field Data in California." Open-File Report 2013-1170-C.

California Geological Survey Special Report 229. 2013. http://pubs

.usgs.gov/of/2013/1170/c/pdf/ofr2013-1170c.pdf 7-6 PG&E Letter DCL-15-034 Enclosure 1 Uslu, 2008. Uslu, B. "Deterministic and Probabilistic tsunami studies in California from near and farfield sources," PhD Dissertation, USC. ProQuest.

2008. Whitmore, 2013. Whitmore P., Bohyun-Bahng B., and Knight, W. "Effects of subfault discretization and horizontal displacement on tsunami generation." S. L. Ross and L. M., Jones eds. Tsunami Scenario:

U.S. Geological Survey Open-File Report 2013. Chp D. 2013. http://pubs.

usgs.gov/of/2013/1170/b/. WMO, 1986. World Meteorological Organization.

"1986: Manual for Estimation of Probable Maximum Precipitation, Operational Hydrology Report No. 1 ," WMO No. 332, Geneva, Switzerland.

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"2009: Manual for Estimation of Probable Maximum Precipitation, Operational Hydrology Report No. 1 ," WMO No. 1045, Geneva, Switzerland.

Wills, 2007. Wills, C. J., II, R. W., and Bryant, W. A. "California fault parameters for the national seismic hazard maps and working group on California earthquake probabilities.

US Geological Survey Open File Report. 2007. 7-7 Table 3-1 Diablo Creek Location Used in Storm Calculations Elevation Used 100 feet Location Used Latitude Longitude 35.211 120.855 PG&E Letter DCL-15-034 Enclosure 1 Table 3-2 Storms Used in the Diablo Creek Site-Specific PMP Calculation OCPJB Toial Adjustment DaPl-hoor Stiltion Nmue State Lat Lon Year [actor IP OAKL.A J"\lll SOUTH CA 31.7830 -122.1500 19!19 H 19 326 L3S 450 BEL.'illt HOTEL CA 3 4.0S-6 0 -HS.45 SO 198.3 3.00 1.4-0 4.2'0 CA 332560 -H 7.3200 1993 16 2.95 U9 4.W !LAGUNA BEACH CA 33.5510 199'7 12 250 1.47 3.<iS 'WHEElER GORGE CA. 34.3610 -11'9383() 1M2. 2 12 U-3 332 --------SA!."\f r...L'\RCOS TROUT CA 3-U!SJO -)i'9.SO!IO ! 'IJ 2.15 1.4-S. 3.18 --------DOUl TON TiJ:N1'l"El CA 34.4650 -U9.70SO 1973 .2 11 2.15 1Jj 3.'()4 -------ST.'\.J.""-41J'iVOOD FIRE STATION CA 34.4 500 -119.6 830 198.3 9 29 2.4 0 1.19' 2-.SQ ----BOUlDER CREEK CA .37.09'16

-!22.1668 1 9 55 n .2 4 2.20 -NOJQQ!-ll CA .34.534-0 -120.1780 2002 12 20 1.09 114 2.59 GONZALES. CA 365150 -DU1 0:0 199'4 H 10 :2.09 uo 2.42 SIGNAL HILL CA 33.8&0:0 -HS.1667 19g;s 41 2.00 1.19 2.38 ----C_.\..m'ON CREEK CA 34.08.32 -H S.S4l1S 22 1.% L2i 2.37 .. ARROYOSECO CA 3*63590 -12129{}0 1993 H 11 2.01 1.(}6 2..13 Rainfall and LIP values are in inches. Table 3-3 Site-Specific LIP for Various Durations at the DCPP Power Block Duration (hours) DCPP LIP (inches) 0 0 0.25 2.5 0 . .5 3.6 0.75 4.1 1-hour 4 . .5 2.-hour 5.1 3-hour 5.4 4-hour 5.6 5-hour 5.8 6-hour 5.9 PG&E Letter DCL-15-034 Enclosure 1 Table 3-4 Temporal Distributions of 15-Minute Incremental Point PMP at DCPP Site Front End One-Third Center Two-Third End Peaking Peaking Peaking Peaking Peaking Duration I LIP* PLIP** I LIP PLIP I LIP PLIP I LIP PLIP I LIP PLIP (hours) (in) (in) (in) (in) (in) 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.250 2.475 0.423 0.043 0.007 0.026 0.005 0.006 0.001 0.006 0.001 0.500 3.555 0.608 0.093 0.016 0.054 0.009 0.032 0.006 0.032 0.006 0.750 4.095 0.700 0.173 0.030 0.084 0.014 0.059 0.010 0.059 0.010 1.000 4.500 0.769 0.269 0.046 0.118 0.020 0.086 0.015 0.086 0.015 1.250 4.683 0.801 0.422 0.072 0.161 0.028 0.115 0.020 0.115 0.020 1.500 4.841 0.828 0.605 0.103 0.211 0.036 0.146 0.025 0.146 0.025 1.750 4.994 0.854 1.145 0.196 0.291 0.050 0.177 0.030 0.177 0.030 2.000 5.130 0.877 3.620 0.619 0.387 0.066 0.211 0.036 0.211 0.036 2.250 5.226 0.893 4.700 0.803 0.540 0.092 0.254 0.043 0.246 0.042 2.500 5.318 0.909 5.105 0.873 0.723 0.124 0.304 0.052 0.289 0.049 2.750 5.397 0.923 5.263 0.900 1.263 0.216 0.384 0.066 0.335 0.057 3.000 5.465 0.934 5.399 0.923 3.738 0.639 0.480 0.082 0.385 0.066 3.250 5.515 0.943 5.491 0.939 4.818 0.824 0.633 0.108 0.453 0.077 3.500 5.561 0.951 5.558 0.950 5.223 0.893 0.816 0.139 0.532 0.091 3.750 5.604 0.958 5.604 0.958 5.381 0.920 1.356 0.232 0.624 0.107 4.000 5.639 0.964 5.639 0.964 5.517 0.943 3.831 0.655 0.720 0.123 4.250 5.673 0.970 5.673 0.970 5.608 0.959 4.911 0.839 0.856 0.146 4.500 5.704 0.975 5.704 0.975 5.676 0.970 5.316 0.909 1.009 0.172 4.750 5.735 0.980 5.735 0.980 5.721 0.978 5.474 0.936 1.167 0.199 5.000 5.764 0.985 5.764 0.985 5.757 0.984 5.610 0.959 1.350 0.231 5.250 5.791 0.990 5.791 0.990 5.789 0.989 5.701 0.975 1.755 0.300 5.500 5.818 0.994 5.818 0.994 5.817 0.994 5.769 0.986 2.295 0.392 5.750 5.844 0.999 5.844 0.999 5.844 0.999 5.814 0.994 3.375 0.577 6.000 5.850 1.000 5.850 1.000 5.850 1.000 5.850 1.000 5.900 1.000

• ILIP = cumulative LIP;** PLIP = Portion of cumulative LIP PG&E Letter DCL-15-034 Enclosure 1 Table 3-5 Maximum LIP Flooding Parameters near the Doors and Areas to the West of the Turbine and Buttress Buildings No Door/Unit Door 1 1hr. Grid No Grid Elev. MaxWSE MaxWD MaxWD2 No

• Elev. or Area (ft-PG&E (ft-PG&E (above grid (above Door Elev. (PG&E Local Local surface) ft lhr. or Area) Local Datum) Datum) Datum) -Elev. ft (1, (2) (3) (4) (5) (6) (7) = (6) -(5) (8) = (6) -(3) Turbine Building Unit 1: North West 1 A1 86.8 1034 86.58 86.73 0.15 -0.07 2 A2 86.5* 1177 86.57 86.59 0.05** 0.09 3 A3 86.5* 1634 86.53 86.63 0.10 0.13 4 101-1 86.8 2302 86.85 86.99 0.14 0.19 5 102-1 86.8 1975 86.82 86.94 0.12 0.14 6 119-1 86.8 3689 86.67 87.09 0.42 0.29 7 122-1 86.8* I 4622 86.54 87.12 0.58 0.32 8 c 86.8 3115 86.49 86.69 0.20 -0.11 Turbine Building Unit 2: South West 9 B1 86.8 6357 86.69 87.31 0.62 0.51 10 B2 86.5* I 5352 86.77 86.77 0.05** 0.27 11 B3 86.5* 3451 86.07 86.07 0.05** -0.43 12 101-2 86.8 8059 86.65 87.39 0.74 0.59 13 102-2 86.8 7625 86.61 87.37 0.76 0.57 14 119-2 86.8 8729 86.77 87.46 0.69 0.66 15 122-2 86.8* 7860 86.65 87.48 0.83 0.68 Unit 1 -Auxiliary Building Area (Ventilation Building) 16 192-1 86.8 5200 87.43 87.48 0.05 0.68 17 191-1 86.8 7055 86.81 87.19 0.38 0.39 18 194-1 86.8 6427 86.65 87.14 0.48 0.34 Unit 2-Auxiliary Building Area (Ventilation Building) 19 192-2 86.8 7437 87.34 87.48 0.14 0.68 20 191-2 86.8* 11759 88.05 88.2 0.16 1.4 21 194-2 86.8 11281 86.81 87.5 0.69 0.7 Fuel Handling Building (East of Unit 1) 22 363-1 116.8 9691 116.48 116.66 0.18 -0.14 23 361-1 116.8 9682 116.72 116.91 0.19 0.11 24 360-1 116.8 9681 116.82 116.92 0.09 0.12 25 355-1 116.8 10601 116.87 117.15 0.28 0.35 26 354-1 116.8 10599 116.96 117.16 0.20 0.36 Fuel Handling Building (East of Unit 2) 27 360-2 116.8 11303 116.91 117.19 0.29 0.39 28 361-2 116.8 11539 116.8 117.19 0.39 0.39 29 363-2 116.8 12726 116.53 116.61 0.09 -0.19 1. Thr.-Eiev. -Threshold Elevation

2. Negative value reflects no LIP exceedance near the doors or areas

• Door/Unit Nos. are shown in Figure 3-2. ** Minimum ponding depth taken as 0.05 feet. Max Duration (hours) (9) 0.58 0.24 0.17 0.26 0.22 0.87 3.42 0.00 2.68 0.00 0.00 2.73 2.75 2.43 2.76 0.21 3.11 1.10 0.41 0.56 1.94 0.55 0.59 0.16 1.62 1.00 2.70 4.41 0.26 Table 3-6 No 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 PG&E Letter DCL-15-034 Enclosure 1 Hydrodynamic and Total Associated Effects Resulting from LIP Flood Event MaxWD Max Hydrostatic Load Hydrodynamic Load Door/Unit (above Velocity No

• grid Pressure Force Pressure Force Total Force surface) ft (ft/s) (lb/ft2) (lblft) (lb/ft2) (lb/ft) (lb/ft) *** Turbine Building Unit 1: North West A1 0.15 0.28 9.36 0.70 0.15 0.02 0.72 A2 0.05** 0.13 3.74 0.11 0.03 0.00 0.11 A3 0.10 0.06 3.74 0.11 0.01 0.00 0.11 101-1 0.14 0.20 8.74 0.61 0.08 0.01 0.62 102-1 0.12 0.12 7.49 0.45 0.03 0.00 0.45 119-1 0.42 0.32 26.21 5.50 0.20 0.08 5.59 122-1 0.58 0.21 36.19 10.50 0.09 0.05 10.55 c 0.20 0.00 1.87 0.03 0.00 0.00 0.03 Turbine Building Unit 2: South West B1 0.62 1.16 38.69 11.99 2.61 1.62 13.61 B2 0.05** 0.00 1.87 0.03 0.00 0.00 0.03 B3 0.05** 0.00 1.87 0.03 0.00 0.00 0.03 101-2 0.74 0.62 46.18 17.09 0.74 0.55 17.64 102-2 0.76 0.64 47.42 18.02 0.79 0.60 18.62 119-2 0.69 0.32 43.06 14.85 0.20 0.14 14.99 122-2 0.83 0.10 51.79 21.49 0.02 0.02 21.51 Unit 1 -Auxiliary Building Area (Ventilation Building) 192-1 0.05 0.35 3.12 0.08 0.24 0.01 0.09 191-1 0.38 0.80 23.71 4.51 1.24 0.47 4.98 194-1 0.48 0.45 29.95 7.19 0.39 0.19 7.38 Unit 2-Auxiliary Building Area (Ventilation Building) 192-2 0.14 0.12 8.74 0.61 0.03 0.00 0.62 191-2 0.16 1.02 9.98 0.80 2.02 0.32 1.12 194-2 0.69 0.37 43.06 14.85 0.27 0.18 1 5.04 Fuel Handling Building (East of Unit 1) 363-1 0.18 0.38 19.34 3.00 0.28 0.09 3.09 361-1 0.19 0.24 11.86 1.13 0.11 0.02 1.15 360-1 0.09 0.10 5.62 0.25 0.02 0.00 0.25 355-1 0.28 0.32 17.47 2.45 0.20 0.06 2.50 354-1 0.20 0.18 12.48 1.25 0.06 0.01 1.26 Fuel Handling Building (East of Unit 2) 360-2 0.29 0.10 18.10 2.62 0.02 0.01 2.63 361-2 0.39 0.14 24.34 4.75 0.04 0.01 4.76 363-2 0.09 0.16 5.62 0.25 0.05 0.00 0.26

• Door/Unit Nos. are shown in Figure 3-2. ** Minimum ponding depth taken as 0.05 feet. *** Total force is the sum of the hydrostatic load force and the hydrodynamic load force.

PG&E Letter DCL-15-034 Enclosure 1 Table 3-7 GEV Fitted Precipitation Estimates and 90°/o Cl at DCPP Site Return Period, 2 5 10 25 50 100 200 500 1000 10,000 100,000 1,000,000 years Lower 0.48 0.67 0.79 0.96 1.08 1.21 1.34 1.51 1.64 2.09 2.55 2.86 90% MCS Upper 0.49 0.67 0.80 0.96 1.09 1.21 1.34 1.52 1.66 2.16 2.76 3.62 90% MCS GEV_Mean 0.49 0.67 0.80 0.96 1.08 1.21 1.34 1.52 1.65 2.13 2.64 3.19

• Units are inches calibrated for a one-hour maximum.

Time (hours) 0 0.25 0.5 0.75 1 1.25 1.5 1.75 2 2.25 2.5 2.75 3 3.25 3.5 3.75 4 4.25 4.5 4.75 5 5.25 5.5 5.75 6 6.25 6.5 6.75 7 7.25 7.5 7.75 8 8.25 8.5 8.75 9 9.25 9.5 9.75 10 10.25 10.5 Table 3-8General Storm PMP (Page 1 of 7) PG&E Letter DCL-15-034 Enclosure 1 15-Minute Incremental General Storm PlvfP Depths (inches) for Five Temporal Distributions One-Third Center Two-Thirds Front Peaking Peaking Peaking Peaking End Peaking 0.0000 0.0000 0.0000 0.0000 0.0000 0.6551 0.0711 0.0199 0.0192 0.0192 0.6174 0.0719 0.0212 0.0199 0.0199 0.5812 0.0727 0.0225 0.0205 0.0205 0.5464 0.0735 0.0238 0.0212 0.0212 0.3187 0.0742 0.0251 0.0219 0.0219 0.3157 0.0749 0.0264 0.0225 0.0225 0.3127 0.0757 0.0277 0.0232 0.0232 0.3097 0.0764 0.0290 0.0238 0.0238 0.3068 0.0771 0.0302 0.0245 0.0245 0.3038 0.0778 0.0315 0.0251 0.0251 0.3007 0.0785 0.0327 0.0258 0.0258 0.2977 0.0792 0.0339 0.0264 0.0264 0.2947 0.0798 0.0351 0.0271 0.0271 0.2917 0.0805 0.0363 0.0277 0.0277 0.2886 0.0811 0.0375 0.0283 0.0283 0.2856 0.0818 0.0387 0.0290 0.0290 0.2825 0.0824 0.0399 0.0296 0.0296 0.2794 0.0830 0.0410 0.0302 0.0302 0.2764 0.0836 0.0422 0.0309 0.0309 0.2733 0.0842 0.0433 0.0315 0.0315 0.2702 0.0847 0.0444 0.0321 0.0321 0.2671 0.0853 0.0455 0.0327 0.0327 0.2640 0.0858 0.0466 0.0333 0.0333 0.2608 0.0864 0.0477 0.0339 0.0339 0.2577 0.0869 0.0488 0.0345 0.0345 0.2546 0.0874 0.0498 0.0351 0.0351 0.2514 0.0879 0.0509 0.0357 0.0357 0.2482 0.0884 0.0519 0.0363 0.0363 0.2451 0.0889 0.0530 0.0369 0.0369 0.2419 0.0894 0.0540 0.0375 0.0375 0.2387 0.0898 0.0550 0.0381 0.0381 0.2355 0.0903 0.0560 0.0387 0.0387 0.2323 0.0907 0.0570 0.0393 0.0393 0.2291 0.0911 0.0579 0.0399 0.0399 0.2259 0.0915 0.0589 0.0404 0.0404 0.2227 0.0919 0.0598 0.0410 0.0410 0.2194 0.0923 0.0608 0.0416 0.0416 0.2162 0.0927 0.0617 0.0422 0.0422 0.2129 0.0931 0.0626 0.0427 0.0427 0.2097 0.0934 0.0635 0.0433 . 0.0433 0.2064 0.0938 0.0644 0.0439 0.0439 0.2031 0.0941 0.0653 0.0444 0.0444 Table 3-8General Storm PMP (Page 2 of 7) PG&E Letter DCL-15-034 Enclosure 1 15-Minute Incremental General Storm Pl\.1P Depths (inches) for Five Temporal Distributions Time (hours) One-Third Center Two-Thirds Front Peaking Peaking Peaking Peaking End Peaking 10.75 0.1998 0.0944 0.0661 0.0450 0.0450 11 0.1965 0.0947 0.0670 0.0455 0.0455 11.25 0.1932 0.0950 0.0679 0.0461 0.0461 11.5 0.1899 0.0953 0.0687 0.0466 0.0466 11.75 0.1866 0.0956 0.0695 0.0472 0.0472 12 0.1832 0.0959 0.0703 0 0.0477 0.0477 12.25 0.0988 0.0961 0.0711 0.0482 0.0482 12.5 0.0988 0.0964 0.0719 0.0488 0.0488 12.75 0.0988 0.0966 0.0727 0.0493 0.0493 13 0.0988 0.0968 0.0735 0.0498 0.0498 13.25 0.0988 0.0970 0.0742 0.0504 0.0504 13.5 0.0988 0.0972 0.0749 0.0509 0.0509 13.75 0.0988 0.0974 0.0757 0.0514 0.0514 14 0.0988 0.0976 0.0764 0.0519 0.0519 14.25 0.0988 0.0977 0.0771 0.0524 0.0524 14.5 0.0988 0.0979 0.0778 0.0530 0.0530 14.75 0.0987 0.0980 0.0785 0.0535 0.0535 15 0.0987 0.0982 0.0792 0.0540 0.0540 15.25 0.0987 0.0983 0.0798 0.0545 0.0545 15.5 0.0987 0.0984 0.0805 0.0550 0.0550 15.75 0.0986 0.0985 0.0811 0.0555 0.0555 16 0.0986 0.0986 0.0818 0.0560 0.0560 16.25 0.0986 0.0986 0.0824 0.0565 0.0565 16.5 0.0985 0.0987 0.0830 0.0570 0.0570 16.75 0.0985 0.0987 0.0836 0.0574 0.0574 17 0.0984 0.0988 0.0842 0.0579 0.0579 17.25 0.0984 0.0988 0.0847 0.0584 0.0584 17.5 0.0983 0.0988 0.0853 0.0589 0.0589 17.75 0.0983 0.0988 0.0858 0.0594 0.0594 18 0.0982 0.0988 0.0864 0.0598 0.0598 18.25 0.0982 0.1866 0.0869 0.0603 0.0603 18.5 0.0981 0.1932 0.0874 0.0608 0.0608 18.75 0.0980 0.1998 0.0879 0.0612 0.0612 19 0.0980 0.2064 0.0884 0.0617 0.0617 19.25 0.0979 0.2129 0.0889 0.0622 0.0622 19.5 0.0978 0.2194 0.0894 0.0626 0.0626 19.75 0.0977 0.2259 0.0898 0.0631 0.0631 20 0.0977 0.2323 0.0903 0.0635 0.0635 20.25 0.0976 0.2387 0.0907 0.0640 0.0640 20.5 0.0975 0.2451 0.0911 0.0644 0.0644 20.75 0.0974 0.2514 0.0915 0.0648 0.0648 21 0.0973 0.2577 0.0919 0.0653 0.0653 21.25 0.0972 0.2640 0.0923 0.0657 0.0657.

Table 3-8General Storm PMP (Page 3 of 7) PG&E Letter DCL-15-034 Enclosure 1 15-Minute Incremental General Storm PJ\.1P Depths (inches) for Five Temporal Distributions Time (hours) One-Third Center Two-Thirds Front Peaking Peaking Peaking Peaking End Peaking 21.5 0.0971 0.2702 0.0927 0.0661 0.0661 21.75 0.0970 0.2764 0.0931 0.0666 0.0666 22 0.0969 0.2825 0.0934 0.0670 0.0670 22.25 0.0968 0.2886 0.0938 0.0674 0.0674 22.5 0.0967 0.2947 0.0941 0.0679 0.0679 22.75 0.0966 0.3007 0.0944 0.0683 0.0683 23 0.0965 0.3068 0.0947 0.0687 0.0687 23.25 0.0964 0.3127 0.0950 0.0691 0.0691 23.5 0.0962 0.3187 0.0953 0.0695 0.0695 23.75 0.0961 0.5812 0.0956 0.0699 0.0699 24 0.0960 0.6551 0.0959 0.0703 0.0703 24.25 0.0959 0.6174 0.0961 0.0711 0.0707 24.5 0.0957 0.5464 0.0964 0.0719 0.0711 24.75 0.0956 0.3157 0.0966 0.0727 0.0715 25 0.0955 0.3097 0.0968 0.0735 0.0719 25.25 0.0953 0.3038 0.0970 0.0742 0.0723 25.5 0.0952 0.2977 0.0972 0.0749 0.0727 25.75 0.0950 0.2917 0.0974 0.0757 0.0731 26 0.0949 0.2856 0.0976 0.0764 0.0735 26.25 0.0947 0.2794 0.0977 0.0771 0.0738 26.5 0.0946 0.2733 0.0979 0.0778 0.0742 26.75 0.0944 0.2671 0.0980 0.0785 0.0746 27 0.0943 0.2608 0.0982 0.0792 0.0749 27.25 0.0941 0.2546 0.0983 0.0798 0.0753 27.5 0.0939 0.2482 0.0984 0.0805 0.0757 27.75 0.0938 0.2419 0.0985 0.0811 0.0760 28 0.0936 0.2355 0.0986 0.0818 0.0764 28.25 0.0934 0.2291 0.0986 0.0824 0.0768 28.5 0.0933 0.2227 0.0987 0.0830 0.0771 28.75 0.0931 0.2162 0.0987 0.0836 0.0775 29 0.0929 0.2097 0.0988 0.0842 0.0778 29.25 0.0927 0.2031 0.0988 0.0847 0.0782 29.5 0.0925 0.1965 0.0988 0.0853 0.0785 29.75 0.0923 0.1899 0.0988 0.0858 0.0788 30 0.0921 0.1832 0.0988 0.0864 0.0792 30.25 0.0919 0.0988 0.1866 0.0869 0.0795 30.5 0.0917 0.0988 0.1932 0.0874 0.0798 30.75 0.0915 0.0988 0.1998 0.0879 0.0802 31 0.0913 0.0988 0.2064 0.0884 0.0805 31.25 0.0911 0.0988 0.2129 0.0889 0.0808 31.5 0.0909 0.0987 0.2194 0.0894 0.0811 31.75 0.0907 0.0987 0.2259 0.0898 0.0814 32 0.0905 0.0986 0.2323 0.0903 0.0818 Table 3-BGeneral Storm PMP (Page 4 of 7) PG&E Letter DCL-15-034 Enclosure 1 15-Minute Incremental General Storm PMP Depths (inches) for Five T ernporal Distributions Time (hours) One-Third Center Two-Thirds Front Peaking Peaking Peaking Peaking End Peaking 32.25 0.0903 0.0985 0.2387 0.0907 0.0821 32.5 0.0900 0.0984 0.2451 0.0911 0.0824 32.75 0.0898 0.0983 0.2514 0.0915 0.0827 33 0.0896 0.0982 0.2577 0.0919 0.0830 33.25 0.0894 0.0981 0.2640 0.0923 0.0833 33.5 0.0891 0.0980 0.2702 0.0927 0.0836 33.75 0.0889 0.0978 0.2764 0.0931 0.0839 34 0.0887 0.0977 0.2825 0.0934 0.0842 34.25 0.0884 0.0975 0.2886 0.0938 0.0844 34.5 0.0882 0.0973 0.2947 0.0941 0.0847 34.75 0.0879 0.0971 0.3007 0.0944 0.0850 35 0.0877 0.0969 0.3068 0.0947 0.0853 35.25 0.0874 0.0967 0.3127 0.0950 0.0856 35.5 0.0872 0.0965 0.3187 0.0953 0.0858 35.75 0.0869 0.0962 0.5812 0.0956 0.0861 36 0.0866 0.0960 0.6551 0.0959 0.0864 36.25 0.0864 0.0957 0.6174 0.0961 0.0866 36.5 0.0861 0.0955 0.5464 0.0964 0.0869 36.75 0.0858 0.0952 0.3157 0.0966 0.0872 37 0.0856 0.0949 0.3097 0.0968 0.0874 37.25 0.0853 0.0946 0.3038 0.0970 0.0877 37.5 0.0850 0.0943 0.2977 0.0972 0.0879 37.75 0.0847 0.0939 0.2917 0.0974 0.0882 38 0.0844 0.0936 0.2856 0.0976 0.0884 38.25 0.0842 0.0933 0.2794 0.0977 0.0887 38.5 0.0839 0.0929 0.2733 0.0979 0.0889 38.75 0.0836 0.0925 0.2671 0.0980 0.0891 39 0.0833 0.0921 0.2608 0.0982 0.0894 39.25 0.0830 0.0917 0.2546 0.0983 0.0896 39.5 0.0827 0.0913 0.2482 0.0984 0.0898 39.75 0.0824 0.0909 0.2419 0.0985 0.0900 40 0.0821 0.0905 0.2355 0.0986 0.0903 40.25 0.0818 0.0900 0.2291 0.0986 0.0905 40.5 0.0814 0.0896 0.2227 0.0987 0.0907 40.75 0.0811 0.0891 0.2162 0.0987 0.0909 41 0.0808 0.0887 0.2097 0.0988 0.0911 41.25 0.0805 0.0882 0.2031 0.0988 0.0913 41.5 0.0802 0.0877 0.1965 0.0988 0.0915 41.75 0.0798 0.0872 0.1899 0.0988 0.0917 42 0.0795 0.0866 0.1832 0.0988 0.0919 42.25 0.0792 0.0861 0.0988 0.1866 0.0921 42.5 0.0788 0.0856 0.0988 0.1932 0.0923 42.75 0.0785 0.0850 0.0988 0.1998 0.0925 Table 3-BGeneral Storm PMP (Page 5 of 7) PG&E Letter DCL-15-034 Enclosure 1 15-Minute Incremental General Storm PlvfP Depths (inches) for Five T ernporal Distributions Time (hours) One-Third Center Two-Thirds Front Peaking Peaking Peaking Peaking End Peaking 43 0.0782 0.0844 0.0988 0.2064 0.0927 43.25 0.0778 0.0839 0.0988 0.2129 0.0929 43.5 0.0775 0.0833 0.0987 0.2194 0.0931 43.75 0.0771 0.0827 0.0987 0.2259 0.0933 44 0.0768 0.0821 0.0986 0.2323 0.0934 44.25 0.0764 0.0814 0.0985 0.2387 0.0936 44.5 0.0760 0.0808 0.0984 0.2451 0.0938 44.75 0.0757 0.0802 0.0983 0.2514 0.0939 45 0.0753 0.0795 0.0982 0.2577 0.0941 45.25 0.0749 0.0788 0.0981 0.2640 0.0943 45.5 0.0746 0.0782 0.0980 0.2702 0.0944 45.75 0.0742 0.0775 0.0978 0.2764 0.0946 46 0.0738 0.0768 0.0977 0.2825 0.0947 46.25 0.0735 0.0760 0.0975 0.2886 0.0949 46.5 0.0731 0.0753 0.0973 0.2947 0.0950 46.75 0.0727 0.0746 0.0971 0.3007 0.0952 47 0.0723 0.0738 0.0969 0.3068 0.0953 47.25 0.0719 0.0731 0.0967 0.3127 0.0955 47.5 0.0715 0.0723 0.0965 0.3187 0.0956 47.75 0.0711 0.0715 0.0962 0.5812 0.0957 48 0.0707 0.0707 0.0960 0.6551 0.0959 48.25 0.0703 0.0703 0.0957 0.6174 0.0960 48.5 0.0699 0.0699 0.0955 0.5464 0.0961 48.75 0.0695 0.0695 0.0952 0.3157 0.0962 49 0.0691 0.0691 0.0949 0.3097 0.0964 49.25 0.0687 0.0687 0.0946 0.3038 0.0965 49.5 0.0683 0.0683 0.0943 0.2977 0.0966 49.75 0.0679 0.0679 0.0939 0.2917 0.0967 50 0.0674 0.0674 0.0936 0.2856 0.0968 50.25 0.0670 0.0670 0.0933 0.2794 0.0969 50.5 0.0666 0.0666 0.0929 0.2733 0.0970 50.75 0.0661 0.0661 0.0925 0.2671 0.0971 51 0.0657 0.0657 0.0921 0.2608 0.0972 51.25 0.0653 0.0653 0.0917 0.2546 0.0973 51.5 0.0648 0.0648 0.0913 0.2482 0.0974 51.75 0.0644 0.0644 0.0909 0.2419 0.0975 52 0.0640 0.0640 0.0905 0.2355 0.0976 52.25 0.0635 0.0635 0.0900 0.2291 0.0977 52.5 0.0631 0.0631 0.0896 0.2227 0.0977 52.75 0.0626 0.0626 0.0891 0.2162 0.0978 53 0.0622 0.0622 0.0887 0.2097 0.0979 53.25 0.0617 0.0617 0.0882 0.2031 0.0980 53.5 0.0612 0.0612 0.0877 0.1965 0.0980 Table 3-8General Storm PMP (Page 6 of 7) PG&E Letter DCL-15-034 Enclosure 1 15-Minute Incremental General Storm Pl\.1P Depths (inches) for Five Temporal Distributions Time (hours) One-Third Center Two-Thirds Front Pealcing Peaking Peaking Peaking End Peaking 53.75 0.0608 0.0608 0.0872 0.1899 0.0981 54 0.0603 0.0603 0.0866 0.1832 0.0982 54.25 0.0598 0.0598 0.0861 0.0988 0.0982 54.5 0.0594 0.0594 0.0856 0.0988 0.0983 54.75 0.0589 0.0589 0.0850 0.0988 0.0983 55 0.0584 0.0584 0.0844 0.0988 0.0984 55.25 0.0579 0.0579 0.0839 0.0988 0.0984 55.5 0.0574 0.0574 0.0833 0.0987 0.0985 55.75 0.0570 0.0570 0.0827 0.0987 0.0985 56 0.0565 0.0565 0.0821 0.0986 0.0986 56.25 0.0560 0.0560 0.0814 0.0985 0.0986 56.5 0.0555 0.0555 0.0808 0.0984 0.0986 56.75 0.0550 0.0550 0.0802 0.0983 0.0987 57 0.0545 0.0545 0.0795 0.0982 0.0987 57.25 0.0540 0.0540 0.0788 0.0981 0.0987 57.5 0.0535 0.0535 0.0782 0.0980 0.0987 57.75 0.0530 0.0530 0.0775 0.0978 0.0988 58 0.0524 0.0524 0.0768 0.0977 0.0988 58.25 0.0519 0.0519 0.0760 0.0975 0.0988 58.5 0.0514 0.0514 0.0753 0.0973 0.0988 58.75 0.0509 0.0509 0.0746 0.0971 0.0988 59 0.0504 0.0504 0.0738 0.0969 0.0988 59.25 0.0498 0.0498 0.0731 0.0967 0.0988 59.5 0.0493 0.0493 0.0723 0.0965 0.0988 59.75 0.0488 0.0488 0.0715 0.0962 0.0988 60 0.0482 0.0482 0.0707 0.0960 0.0988 60.25 0.0477 0.0477 0.0699 0.0957 0.1832 60.5 0.0472 0.0472 0.0691 0.0955 0.1866 60.75 0.0466 0.0466 0.0683 0.0952 0.1899 61 0.0461 0.0461 0.0674 0.0949 0.1932 61.25 0.0455 0.0455 0.0666 0.0946 0.1965 61.5 0.0450 0.0450 0.0657 0.0943 0.1998 61.75 0.0444 0.0444 0.0648 0.0939 0.2031 62 0.0439 0.0439 0.0640 0.0936 0.2064 62.25 0.0433 0.0433 0.0631 0.0933 0.2097 62.5 0.0427 0.0427 0.0622 0.0929 0.2129 62.75 0.0422 0.0422 0.0612 0.0925 0.2162 63 0.0416 0.0416 0.0603 0.0921 0.2194 63.25 0.0410 0.0410 0.0594 0.0917 0.2227 63.5 0.0404 0.0404 0.0584 0.0913 0.2259 63.75 0.0399 0.0399 0.0574 0.0909 0.2291 64 0.0393 0.0393 0.0565 0.0905 0.2323 64.25 0.0387 0.0387 0.0555 0.0900 0.2355 Table 3-BGeneral Storm PMP (Page 7 of 7) PG&E Letter DCL-15-034 Enclosure 1 15-Minute Incremental General Storm PMP Depths (inches) for Five Temporal Distributions Time (hours) One-Third Center Two-Thirds Front Pealcing Peaking Peaking Peaking End Peaking 64.5 0.0381 0.0381 0.0545 0.0896 0.2387 64.75 0.0375 0.0375 0.0535 0.0891 0.2419 65 0.0369 0.0369 0.0524 0.0887 0.2451 65.25 0.0363 0.0363 0.0514 0.0882 0.2482 65.5 0.0357 0.0357 0.0504 0.0877 0.2514 65.75 0.0351 0.0351 0.0493 0.0872 0.2546 66 0.0345 0.0345 0.0482 0.0866 0.2577 66.25 0.0339 0.0339 0.0472 0.0861 0.2608 66.5 0.0333 0.0333 0.0461 0.0856 0.2640 66.75 0.0327 0.0327 0.0450 0.0850 0.2671 67 0.0321 0.0321 0.0439 0.0844 0.2702 67.25 0.0315 0.0315 0.0427 0.0839 0.2733 67.5 0.0309 0.0309 0.0416 0.0833 0.2764 67.75 0.0302 0.0302 0.0404 0.0827 0.2794 68 0.0296 0.0296 0.0393 0.0821 0.2825 68.25 0.0290 0.0290 0.0381 0.0814 0.2856 68.5 0.0283 0.0283 0.0369 0.0808 0.2886 68.75 0.0277 0.0277 0.0357 0.0802 0.2917 69 0.0271 0.0271 0.0345 0.0795 0.2947 69.25 0.0264 0.0264 0.0333 0.0788 0.2977 69.5 0.0258 0.0258 0.0321 0.0782 0.3007 69.75 0.0251 0.0251 0.0309 0.0775 0.3038 70 0.0245 0.0245 0.0296 0.0768 0.3068 70.25 0.0238 0.0238 0.0283 0.0760 0.3097 70.5 0.0232 0.0232 0.0271 0.0753 0.3127 70.75 0.0225 0.0225 0.0258 0.0746 0.3157 71 0.0219 0.0219 0.0245 0.0738 0.3187 71.25 0.0212 0.0212 0.0232 0.0731 0.5464 71.5 0.0205 0.0205 0.0219 0.0723 0.5812 71.75 0.0199 0.0199 0.0205 0.0715 0.6174 72 0.0192 0.0192 0.0192 0.0707 0.6551 Total 30.90 30.90 30.90 30.90 30.90 PG&E Letter DCL-15-034 Enclosure 1 Table 3-9 Wind Speeds and Direction (by date) of Analyzed NDBC Buoys along the California Central Coast Wind Direction Avg Year Month Date 46011 2008 2 24 175.0 2008 2 25 316.8 2007 12 4 329.7 2001 1 11 218.7 2001 1 12 189.1 2007 12 5 336.3 2004 2 26 216.4 2007 1 5 319.8 2008 1 5 191.5 2000 12 22 330.4 1999 4 4 308:2 1999 1 27 169.7 2001 12 21 267.8 1998 12 9 174.5 1998 12 1 192.3 1999 1 26 259.0 2000 12 23 316.5 2001 5 2 321.8 2009 11 8 332.3 1998 11 26 260.6 2009 11 7 319.2 2008 5 22 315.7 2008 1 6 *229.0 1999 2 17 221.4 Wind Speeds -m/s Wind Direction

-degrees 46023 46028 179.8 326.3 340.0 214.0 206.4 189.3 229.3 340.6 238.8 234.3 283.5 347.0 210.8 312.5 306.9 299.5 312.0 258.0 322.3 268.1 282.0 278.2 163.4 220.8 256.2 265.0 312.2 318.5 324.4 315.8 272.5 299.0 249.5 333.5 327.5 326.6 224.3 290.7 241.5 St Dev Wind Direction 46011 46023 46028 24.4 30.4 32.1 33.3 11.3 8.3 33.6 32.3 27.7 40.9 44.4 90.4 10.9 9.1 56.6 52.5 35.8 68.7 128.0 5.5 34.6 34.7 10.1 8.0 17.0 11.3 7.5 5.7 154.9 132.2 6.6 37.4 37.3 164.9 124.7. 90.8 137.1 135.7 98.7 20.2 14.3 14.0 67.4 9.1 6.5 4.1 5.2 4.4 15.6 141.1 125.9 59.9 90.4 5.2 4.3 5.6 4.8 3.2 62.8 74.3 118.3 20.0 65.9 Max Daily Wind Speed Avg Daily Wind Speed St Dev Wind Speed 46011 46023 46028 46011 46023 46028 46011 46023 46028 17.5 20.1 9.8 10.0 4.2 5.0 9.5 9.9 6.0 7.1 2.0 2.1 10.8 11.8 7.2 8.1 1.8 2.1 14.5 16.3 13.3 8.7 10.0 9.1 2.4 2.4 2.3 12.9 12.8 9.8 7.2 7.4 5.8 3.2 3.9 2.7 11.5 12.5 8.3 10.0 1.5 1.2 7.2 7.7 8.6 4.5 5.2 5.9 1.7 1.4 1.4 16.4 18.6 17.3 12.9 14.5 15.5 2.4 2.9 1.0 14.2 14.2 5.4 5.6 3.8 4.1 10.2 11.4 9.1 7.6 8.7 5.2 1.7 1.8 2.4 18.4 20.9 18.1 12.7 15.2 14.3 3.1 3.0 2.3 10.7 13.2 13.0 6.3 8.4 9.9 1.6 2.0 1.6 11.8 13.0 13.8 8.1 9.2 10.1 1.9 2.1 2.0 10.9 13.1 13.0 7.1 8.9 9.5 1.8 1.8 4.0 10.7 12.7 10.6 5.2 5.5 6.9 2.6 3.4 2.3 11.2 14.0 10.7 6.6 8.1 7.0 2.2 2.6 2.0 10.5 12.6 11.8 6.7 10.2 9.1 2.6 1.7 0.9 12.3 14.0 17.2 9.8 12.0 14.9 1.4 1.2 1.2 10.5 13.4 13.3 8.2 9.8 8.7 1.3 1.5 2.6 9.5 9.7 6.0 4.5 5.8 3.1 2.0 1.6 1.8 11.8 14.2 14.5 9.5 11.2 11.5 1.3 1.6 2.1 15.1 18.2 17.2 13.4 15.8 15.8 1.5 1.6 1.1 10.6 11.4 5.5 6.0 2.5 2.8 8.2 9.0 6.1 3.3 4.3 3.9 2.1 2.2 1.1 PG&E Letter DCL-15-034 Enclosure 1 Table 3-10 Maximum Daily Wave Heights and Direction (by date) of Analyzed NDBC Buoys along the California Central Coast Year Month Date 46011 2.008 2. 2.4 6.99 2.008 2. 2.5 6.95 2.007 12. 4 5.05 2.001 1 11 6.98 2.001 1 12. 7.04 2.007 12 5 5.62. 2.004 2. 2.6 7.16 2.007 1 5 6.2.2. 2.008 1 5 8.62. 2.000 12. 2.2. 6.2.1 1999 4 4 6.64 1999 1 Z7 6.65 2001 12 2.1 6.37 1998 12. 9 6.52. 1998 12. 1 6.2.7 1999 1 2.6 4.2.2. 2.000 12. 2.3 7.2.1 2.001 5 2. 6.33 2.009 11 8 5.35 1998 11 2.6 4.92. 2.009 11 7 5.51 2.008 5 2.2. 5.98 2.008 1 6 7.19 1999 2. 17 7.13 Wave Heights-meters Wave Direction

-degrees Maxi Daily Wave Height 4602.3 4602.8 462.15 462.18 46011 7.42. 5.78 5.58 9.97 2.L05 7.26 5.68 5.04 7.5 17.39 5.73 5.92. 4.2. 7.37 19.05 7.66 8.51 6.5 7.2.3 16.67 6.67 6.95 5.6 7.2.1 16.67 7.2.3 5.59 4.72 7.14 19.05 6.75 7.65 5.94 7.13 16.67 6.66 6.92. 3.96 7.12. 17.39 7.61 8.96 6.42 7.08 19.05 5.2.8 7.91 6.05 6.4 2.0.00 6.58 7.72. 3.66 6.57 1250 6.26 7.7 5.33 6.06 16.67 7.1 7.68 5.45 6.12 16.67 6.84 7.5 4.15 4.83 2.0.00 6.71 7.44 5.33 5.78 2.0.00 3.73 7.31 4.37 4.07 16.67 6.78 7.2.7 6.12. 6.39 2.0.00 5.86 7.22 4.33 6.05 16.67 6.68 7.19 3.42. 6.37 19.05 5.67 7.09 4.36 4.87 2.0.00 6.06 7.03 3.93 6.93 19.05 6.02. 7 3.7 6.82. 12..12. 7.14 6.14 4.4 5.77 17.39 5.4 5.35 4.15 5.55 20.00 Max Daily Peak Wave Period Avg Daily Wave Direction Std Dev, Wave Direction 4602.3 4602.8 462.15 462.18 46011 4602.8 462.15 462.18 46011 4602.8 462.15 462.18 2.0.00 19.05 2.0.00 2.0.00 2.2.8.0 2.10.8 2.2.5.2. 2.14.4 43.0 46.2. 30.5 57.9 2.0.00 16.00 18.18 18.18 2.72..5 2.81.6 2.54.9 271.1 5.1 10.1 7.1 4.6 2.0.00 19.05 2.0.00 2.0.00 2.72..6 2.75.1 2.54.3 2.67.3 8.6 9.5 5.2. 5.0 16.67 16.67 16.67 16.67 2.69.9 2.93.6 7.0 5.1 16.67 16.67 16.67 16.67 2.67.4 2.94.7 8.6 4.3 20.00 19.05 2.0.00 18.18 2.73.3 2.80.2. 2.51.0 2.66.1 7.5 6.5 7.5 4.1 2.0.00 2.0.00 18.18 18.18 2.59.3 2.64.2. 2.87.0 39.3 13.7 6.0 16.67 17.39 18.18 16.67 2.99.3 311.0 2.64.8 305.5 9.4 13.5 11.7 8.8 2.0.00 19.05 2.0.00 2.0.00 2.76.5 2.68.5 2.54.8 2.78.0 34.4 33.1 18.8 2.3.1 2.0.00 2.0.00 2.0.00 2.0.00 2.61.8 2.83.9 6.7 7.8 14.2.9 14.2.9 15.38 15.38 2.74.8 311.0 5.5 3.4 16.67 16.67 16.67 16.67 269.8 302.1 3.4 4.7 16.67 16.67 16.67 16.67 264.5 287.2 5.5 4.8 2.0.00 2.0.00 2.0.00 18.18 2.70.6 301.0 6.9 5.8 2.0.00 2.0.00 2.0.00 18.18 2.64.3 2.89.4 6.5 6.2. 16.67 16.67 16.67 16.67 2.73.5 302..8 4.0 6.1 16.67 16.67 18.18 18.18 2.66.1 2.88.3 5.2. 3.4 16.67 14.2.9 16.67 15.38 272.4 305.5 3.9 4.5 2.0.00 17.39 18.18 18.18 317.5 317.5 2.65.3 307.5 7.2. 6.3 4.9 3.4 2.0.00 2.0.00 18.18 18.18 2.69.5 2.93.2. 5.2. 4.4 2.0.00 19.05 2.0.00 2.0.00 314.2. 317.8 269.6 305.4 8.6 3.0 4.6 6.3 12..50 12..90 13.33 13.33 318.3 316.0 2.77.3 315.1 4.6 3.6 3.9 4.1 16.67 17.39 18.18 18.18 2.98.6 2.93.9 2.61.4 2.96.6 5.1 6.1 4.7 3.9 2.0.00 2.0.00 2.0.00 2.0.00 '---2.69.1_ 3.8 L__ __ -----------

PG&E Letter DCL-15-034 Enclosure 1 Table 3-11 Estimated 200 Year Return Period Calibrated to DELFT3D Significant Wave Height NDBC 200 Yr RP Delft3D Percent Buoy (Hsig) (Hsig) [m] Difference

[m] 46028 11.407 11.5510 -1.26% 46215 7.9061 7.9058 0.00% 46011 11.049 11.0456 -1.37% 46023 11.306 11.2005 -0.43% 46218 11.042 11.3541 -0.03% Table 3-12 Boundary and Physical Inputs Used in the DELFT3D Simulation

• Significant wave height, 11.2 m

• Peak wave period, 20 s

• Wave Direction, 270° (westerly)

• Directional spreading, 4o

• Wind Velocity, 10 m/s

• Wind Direction, 270° (westerly)

• Water Density, 1,025 kg/m 3

• Collins Bottom Friction Coefficient, 0.1118 (calibrated)

PG&E Letter DCL-15-034 Enclosure 1 Table 3-13 Maximum Amplitude of Far-Field Coseismic Tsunamis Recorded at Avilla Beach (AB) and Port San Luis (PSL) Tide Gauges Far-Field Coseismic Tsunamis (since 1946) Max. Ampl. (m) No. Date Region/source Lat. (deg.) Lon. (deg.) Dist. (km) Mw PSL AB 1 4/1/1946 Alaska/Unimak 53.492 -162.832 3839 8.6 1.2 2 12/20/1946 Japan/E. Honshu 33 135.6 9039 8.1 0.1 3 11/4/1952 Kamchatka/Kuril 52.755 160.057 6289 9 1.4 4 3/9/1957 Alaska 51.292 -175.629 4668 8.6 0.53 5 11/6/1958 Kamchatka/Kuril 44.53 148.54 7411 8.3 0.14 6 5/22/1960 S. America/Chile

-39.5 -74.5 9565 9.6 0.99 7 10/13/1963 Kamchatka/Ku ril 44.77 149.798 7310 8.5 0.3 8 3/28/1964 Alaska 61.017 -147.648 3448 9.2 1.6 9 10/17/1966 S. America/Peru -10.748 -78.638 6759 8.1 0.1 10 5/16/1968 Japan/E. Honshu 40.8 143.2 7994 8.2 0.1 11 11/29/1975 Hawaii 19.451 -155.033 3785 7.7 0.39 12 6/22/1977 S. Pac.!Tonga Tr. -22.878 -175.9 8685 7.2 0.12 13 10/4/1994 Kamchatka/Kuril 43.773 147.321 7535 8.3 0.15 14 7/30/1995 S. America/Chile

-23.34 -70.294 8402 8 0.12 15 12/3/1995 Kamchatka/Kuril 44.663 149.3 7349 7.9 0.07 16 6/10/1996 Alaska/Andreanov 51.564 -177.632 4805 7.9 0.09 17 11/26/1999 S. PacificNanuatu

-16.423 168.214 9423 7.5 0.05 18 6/23/2001 S. America/Peru

-16.265 -73.641 7577 8.4 0.14 19 9/25/2003 Japan/Hokaido 41.815 143.91 7884 8.3 0.03 20 12/26/2004 Indonesia/Sumatra 3.316 95.854 14286 9.1 0.27 21 11/15/2006 Kamchatka/Kuril 46.592 153.266 6979 8.3 0.56 22 1/13/2007 Kamchatka/Kuril 46.243 154.524 6906 8.1 0.11 23 4/1/2007 S. Pac./Solomon lsi. -8.466 157.043 9851 8.1 0.09 24 8/15/2007 S. America/Peru

-13.386 -76.603 7127 8 0.08 25 1/3/2009 S. Pac./PNG -0.414 132.885 11518 7.6 0.08 26 9/29/2009 S. Pac./Samoa Is. -15.489 -172.095 7812 8 0.28 27 10/7/2009 S. Pac.Nanuatu Is. -13.006 166.51 9329 7.6 0.08 28 2/27/2010 S. America/Chile

-36.122 -72.898 9350 8.8 0.80 29 3/11/2011 Japan/Honshu 38.297 142.372 8200 9 2.02 30 10/28/2012 Canada/Queen Ch. 52.788 -132.101 2153 7.7 0.27 31 2/6/2013 S. Pac./Solomon lsi. -10.799 165.114 9295 7.9 0.14 32 4/1/2014 S. America/Chile -19.642 -70.817 8056 8.2 0.22 Table 3-14 Maximum Amplitude of Near-Field Coseismic Tsunamis Far-Field Coseismic Tsunamis (since 1946) Max. Ampl. (m) No. Date Region/source Lat. (deg.) Lon. (deg.) Dist. (km) Mw PSL AB 11/22/1878 San Luis Obispo N/A* 33 11/4/1927 California/Lompoc 34.813 -120.774 40 7.3** 1.2*** 34 4/25/1992 California/Humboldt 40.368 -124.316 657 7.2 0.07

• 11/22/1878 event was likely caused by a local submarine mass failure ** Original magnitude was Mw 7.0; increased magnitude was recommended by Ellsworth (2003) *** Reported in literature.

Tide gauge not yet installed.

PG&E Letter DCL-15-034 Enclosure 1 Table 3-15 Maximum Expected Magnitudes (Mw) Used in RPMT Simulations Sources MaxMw References Far-Field Alaska (ASZ) 9.2 Johnson et al. (1996) 9.2 lchinose et al. (2007) 9.2 Suito and Freimueller (2009) Semidi (SSZ) 9.1 Ross et al. (2013), Whitmore et al. (2013) Kamchatka

9.2 Gonzalez

et al. (2009)* (KSZ) (Zone KSZ1) Gonzalez et al. (2009)* (Zone KSZ2) Japan (JSZ) 9.1 Grilli et al. (2013a,b; Tappin et al., 2014) Near-Field Hosgri fault 7.66 Petersen et al. (2008), Wills et al. (2007)* (HFS) San Lucia 7.49 Petersen et al. (2008), Wills et al. (2007)* fault (SLFS)

• Parameters rev1sed 1n present study Table 3-16 SMF Parameters Used in RPMT Simulations SMF proxy simulations Goleta SMF Big Sur North In NHWAVE proxy SMF proxy Grid used for generation Goleta 125 Big Sur 500 Center of mass location 35.153 N -120.985 35.097 N -121.904 (Xo, Yo) w w Width w(km) 10.5 10 Length b (km) 7.45 15 Thickness T (m) 75 235 Depth d (m) at center of 300 (1 00-400) 2600 mass Mean slope p of 2 4 failure surface (deg) Azimuth 8 of SMF 245 255 movement (deg. true N) Initial acceleration ao (m/s 2) 0.14 0.26 Maximum velocity Umax(m/s) 25.0 51.9 Motion duration tr (s) 559.0 635.4 Motion runout sr (km) 8.88 21.04 Table 3-17 Summary of RPMT Runup and Drawdown Results PG&E Letter DCL-15-034 Enclosure 1 Far-Field (Distant)

Near-Field (Local) Goleta Proxy SMF Tsunami with Seismic Tsunami Seismic Tsunami Goleta Proxy SMF Tsunami Reduced Breakwater Reevaluation Reevaluation Evaluation (no CLB} CLB CLB CLB Reevaluation (SSZ} (HFS} Max. Water Elevation in the Area of the Intake Structure 30.3 ft. 17.4ft.(S) 34.9 ft. 1.3 ft. (S) N/A 27.9 ft.(4) 32.8 ft. (HHWL} Max. Runup Elevation Behind Intake Structure(3) N/A N/A N/A N/A N/A 32.8 ft. 62.3 ft. (HHWL} Combined!2 l Drawdown Elevation

-8.7 ft. -9.2 ft. -3.8 ft. N/A -8.7 ft.(G) -15.7 ft. -15.7 ft. Splash N/A N/A(l) 60.32 ft. N/A!1 l N/A N/A(l) N/A!1 l ------------All elevations are in NAVD88. 1. RPMT did not result in any splash due to the longer period waves that are seen in the model. 2. The CLB included effects from tsunami, storm waves, storm surge, and tide. Combinations stipulated in NUREG/CR-7046 do not combine the effects from tsunami, storm waves, storm surge, & tide. The RPMT combination includes tsunami, tide, and long-term sea level rise. See Section 3.9. 3. In cases where the water level is high enough to continue over the intake structure, the maximum elevation that is reached up the steep hill behind the intake structure is provided.

4. The HAWL value is reported because it is more limiting than the HHWL. 5. Water levels shown are in the front of the intake structure since levels were not high enough to flow over the top deck of the structure (i.e., less that elevation 20.4 ft. NAVD88 [17.5 ft. MSL]). 6. Even though there is no CLB for the Goleta Proxy SMF, it is compared to -8.7 ft. since this is the most-limiting CLB drawdown value. -

Table 3-18 Maximum Water Current Velocities and Impulse Forces for RPMTs Safety-Related SSC Water Velocity Water Impulse Force ASW Ventilation Huts I 26.2 ft/s 0.86 kip/ft ASW Ventilation Snorkels Intake Structure Curtain Wall 18.0 ft/s 11.3 kip/ft ASW Forebay Ceiling 18.0 ft/s 20.4 kip/ft Intake Structure Top Deck 39.4 ft/s 11.6 kip/ft PG&E Letter DCL-15-034 Enclosure 1

• The velocity and impulse force for the ASW ventilation snorkels are zero because they are not inundated by the RPMTs.

Table 3-19 Potential Tsunami Debris # Commodity 1 Bar Racks 2 Aux Salt Water Pump Screen Gate 3 Screen Wash Pumps 4 Traveling Screen Housing or Internal Parts {Outer covers are fiberglass) 5 Control/office building Intake Access Control & Security building cement 6 blocks, roofing material, interior commodities Maintenance Machine Shop Building cement 7 blocks, roofing material, interior commodities 8 Maintenance and Storage Sea Trains 9 Chlorination Tanks 10 Security Fences and Gratings 11 Security Guard Towers 12 PVC Piping for Biolab {located on hillside) 13 Lighting/camera posts {permanently mounted) 14 Lighting stanchions

{with concrete base) 15 Portable powered lighting carts 16 Gantry Crane 17 Movable Crane 18 Chemical Storage Tank 19 Chemical Transferring Station 20 Moored Intake Cove Boats 21 Kelp Cutter Boat and Trailer 22 Intake Cove Docks 23 Maintenance and operations vehicles {pickup trucks) 24 Smaller 'golf cart' vehicles for personnel transport 25 Employee and visitor personal vehicles 26 Spare Tribars for breakwater construction 27 Lumber/cribbing 28 Meteorologist/Shower/Offices-Building 123 29 Lumber fence located near Building 123 30 Lumber used as retaining walls. 31 Concrete block used as retaining walls directly to east of intake protected area PG&E Letter DCL-15-034 Enclosure 1 Weight Class Material Type 3 Steel 5 Steel 5 Steel 2, 3, 4 Steel 1, 2, 3, 4, 5 Masonry Concrete Masonry 1, 2, 3, 4, 5 Concrete, Wood, Steel Masonry 1, 2, 3, 4, 5 Concrete, Wood, Steel 1, 2, 3, 4, 5, 6 Steel 4, 5,6 Plastic 2; 3,4 Steel 5,6 Wood, Steel 2 Plastic 3 Steel 4 Reinforced Concrete, Steel 4 Steel 6 Steel 6 Steel 4, 5, 6 Plastic 5 Steel, Plastic 5 Steel, Wood 6 Steel 2, 3,4, 5 Wood 5 Steel 4 Steel 5 Steel 6 Reinforced Concrete 1 Wood 1, 2, 3, 4, 5, 6 Wood 2 Wood 1 Wood 1 Masonry Concrete

1. Commodity 32 1 Porta Potties' 33 Metal storage bins/dumpsters 34 Plastic storage bins 35 Compressed air/welding/C0 2 cylinders Portable commodities associated with plant 36 operation

• and maintenance including commodities temporarily stored/staged for maintenance activities 37 Machine shop tools (metal-working floor mounted tools) 38 Manmade and Natural items found in the landscape of areas expected to be inundated 39 Navigation buoys 40 Concrete wheel chocks (for vehicle parking) 41 Eyewash Station 42 Ladders 43 Sandbags 44 BBQs 45 Yellow Flotation Devices 46 Small temporary building Weight Classes are as follows: 1 < 100 lbs. 2 > 100 lbs. and < 500 lbs. 3 > 500 lbs. and < 1,000 lbs. 4 > 1,000 lbs. and < 2,000 lbs. 5 > 2,000 lbs. and< 10,000 lbs. 6 > 10,000 lbs. PG&E Letter DCL-15-034 Enclosure 1 Weight Class Material Type 2 Plastic 2, 3 Steel 2 Plastic 1 Steel 1, 2, 3, 4, 5, 6 Steel, Wood 4,5 Steel 1, 2, 3 ,4 Soil, Sand, Rock 2 Plastic 2 Reinforced Concrete 2 Plastic 1 Steel 1 Soil, Sand, Rock 1 Steel 1 Plastic 3 Steel PG&E Letter DCL-15-034 Enclosure 1 Table 3-20 Tsunami Debris Projectile Impact, Debris Damming, and Combined Forces Civil Commodity Limiting RPMT Limiting CLB Bounded/ Projectile Force Tornado-Generated Not Bounded Missile Force Intake Structure Curtain 4,188 kips 44,206 kips Bounded Wall Intake Structure Top 231.9 kips 44,206 kips Bounded Deck ASW Forebay Ceiling 1 N/A N/A N/A ASW Ventilation Huts 224.3 kips 44,206 kips Bounded ASW Ventilation N/A N/A N/A Snorkels 2 1. The ASW forebay ceiling is an interior structural commodity.

The ASW pump forebay draws seawater that enters under the curtain wall. As the height of the incoming wave exceeds the height of the bottom of the curtain wall (elevation

-4.9 ft. NAVD88), floating projectiles would be excluded from entry to the ASW forebay. Projectiles in the flowstream for the tsunami at an elevation under the bottom of the curtain wall could enter the ASW forebay, but will not strike the forebay ceiling, located at elevation

-0.7 ft. NAVD88, 4.2 feet above the bottom of the curtain wall, as they are not expected to have a velocity component after the forebay area is re-flooded after drawdown.

Therefore , projectile impact to the forebay ceiling is not considered a credible event. 2. The ASW ventilation snorkels are not inundated by the RPMT. The maximum inundation height at the ASW ventilation huts is 5.8 feet. The height of the ASW ventilation huts is 14.5 feet from the intake structure top deck. Therefore, a floating projectile (such as the kelp harvesting vessel) that has a profile above the maximum inundation height is insufficient height to impact the ASW ventilation snorkels.

0 500' 1000' 2000' -----PG&E Letter DCL-15-034 Enclosure 1 BASE MAP FROM 11-IE PORT SAN LUIS, CA (2012) USGS QUADRANGLE MAP, PROVIDED BY WWW.USGSSTORE.GOV.

CONTOUR ELEVAllO N S REFERENCE NAVD 88, CONTOURS ARE SHOWN IN FEET AT 40 FOOT INTERVALS.

Flooding Hazard Reevaluation Report Diablo Canyon Power Plant Figure 2-1 DCPP Site Location

0. 5 0:25 0 PG&E Letter DCL-15-034 Enclosure 1 0.5-Miles Flooding Hazard Reevaluation Report Diablo Canyon Power Plant Figure 2-2 Diablo Creek Watershed 3 7'1l 3J'Il 1 7?'W N + PG&E Letter DCL-15-034 Enclosure 1 11a*w t rrw 5411 Be m a r drno 17"'N CoQnt.nate 5)S!Efll N l*t>*S A111a ll on h 1 83 ).1'N Jl'l l *-===-.:==-------======::::::1------Miles 0 50 100 150 200 Flooding Hazard Reevaluation Report Diablo Canyon Power Plant Figure 3-1 Locations of Storms Used in Ll P Determination n l l J l-1. .. \) \ ,, -\ \I {\ -I

• Orange = doors Blue= areas :: a _____ _ 0 ... Turbine Building 12.2*2 11 ". 7 .. B3 , _? -I ' 0 0 :* "' .. 0 0 .. ... \D * ':" ..., *-1 lD-2 ' ... PG&E Letter DCL-15-034 Enclosure 1 ... "=c -,, .---,.Q_ . --*-') -, *. LJ '--6. I 1 ! ---t I _l * ... r:* _,. r:.\ c::; Flooding Hazard Reevaluation Report Diablo Canyon Power Plant Figure 3-2 Locations of Doors, Safety and Non Safety-Related Structures, and Areas to the West of the Turbine and Buttress Buildings Evaluated for LIP PG&E Letter DCL-15-034 Enclosure 1 WD 0.010-0.050 0.601 -0.800 1.001-1200 -1.201 -1.500 -1.501 -2_500 -2.501 -5.500 Flooding Hazard Reevaluation Report Diablo Canyon Power Plant Figure 3-3 Maximum Water Depth from LIP (ft.)

35 30 ....... c *-.._.. -.6 25 a. CD c a. 20 ::E 0.. 15 +=I ftS ::::s E 10 ::::s u 5 0 -* . . . . . . . . . . . . . . / Diablo Creek General Storm AII-Seaon PMP v v , ..,.,. / r' I( PG&E Letter DCL-15-034 Enclosure 1 :/ o

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• u * . . . . . . . . ' 60 66 72 Flooding Hazard Reevaluation Report Diablo Canyon Power Plant Figure 3-4 Diablo Creek General Storm All-Season Cumulative PMP Values PG&E Letter DCL-15-034 Enclosure 1 Flooding Hazard Reevaluation Report Diablo Canyon Power Plant Figure 3-5 DCPP Site Locations of PMF Inundation 0 4 5 90 180 270 + + + + + + + + PG&E Letter DCL-15-034 Enclosure 1 PMF Uni t -Re tainin g W aR --F etch U ne Di ab lo Creek Cross Secti o ns ..!. + + + + + + + + + 4 + -+ Flooding Hazard Reevaluation Report Diablo Canyon Power Plant Figure 3-6 Critical Fetch Line from Wind Wave Analysis 076 DIABLO CANYON. CA AUGUST 1997 PG&E Letter DCL-15-034 Enclosure 1

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1 5 u 15 21 Day of Month (UTC) 26 31 t-ttp://cdip.u:=l.e dul Flooding Hazard Reevaluation Report Diablo Canyon Power Plant Figure 3-7 Tropical Storm Ignacio and Resulting Significant Wave Heights at the DCPP Waverider Buoy (August 20, 1997)

PG&E Letter DCL-15-034 Enclosure 1 cw Flooding Hazard Reevaluation Report Diablo Canyon Power Plant Figure 3-8 Locations of Analyzed NDBC Buoys Along the California Central Coast 12 11 10 .Cg tlil), Q) :I: Q) 8 ..... c: ., u c: b;tJ I i./5 6 5 4 .. -* 0 20 "0 60

• 6 .... * * , -* * * .. .. * * * * .. ....... . .. " ... 80 100 120 Return Period [Year] PG&E Letter DCL-15-034 Enclosure 1 ... ,-........ . ........ , ........... .. -460 23 -46011 ----46028 *****-46215 46218 40 160 180 200 Flooding Hazard Reevaluation Report Diablo Canyon Power Plant Figure 3-9 Return Periods for Significant Wave Heights at Analyzed NDBC Buoys Along the California Central Coast W G S 84 I UTI.! z o ne 1 ON -

X: 694810.583 Y: 38979 7 3.101 3.8982 3.8981 3.8981 3.8981 3.898 3.8979 3.8979 3.8979 3.8978 3.8977 6.94 8 6.949 6.95 6.951 B athymetry

Ce ntra l C o as t -D at um : NA VD88 6.952 6.953 PG&E Letter DCL-15-034 Enclosure 1 30 ,-20' 10* o: -10 , -20: -30 1 6.954 X 10 5 Flooding Hazard Reevaluation Report Diablo Canyon Power Plant Figure 3-10 Maximum Crest Wave Level (m) at Various Observation Points at the DCPP Breakwaters (with SAWL) 60 55 50 0) 45 z 40 35 30 25 -220 -210 -200 -190 -180 -170 Lon. E. (Deg.) -160 -150 -140 PG&E Letter DCL-15-034 Enclosure 1 -130 -120 Acronyms:

Alaska Subduction Zone (ASZ), Semidi Subduction Zone (SSZ), Kamchatka Subduction Zone (KSZ), Japan Subduction Zone (JSZ). Color scale denotes bathymetry

(<0) and topography(>

0) in meter. Flooding Hazard . Reevaluation Report Diablo Canyon Power Plant Figure 3-11 Location of Various Tsunami Source Areas for DCPP 30 35'0'0 1 23'0'0'\'J Explanat i on 0 D i ablo Canyon Po w er Plant (DCPP) 1 Continental Shelf 2 U pper Cont i nental Slope 3 Lowe r Cont i nenta l Slope 4 U pper Cont i nenta l Rise PA Po i nt Argue ll o PS Po i nt Sa l PB Po i nt Bl..Chon PS R Po in t S ur PC Po i nt Concept i on SMI San Mi guel Islan d PE Po i nt Este r o SR I Sa nta Rosa Is l and PPB Point Pied r as Blancas SCr l Sa nt a Cr uz I sl a nd 0 10 40 K 1 bm elc r s I I I I I I I I 1 1 23 122" 0"0'\IV 1 2 1<o*o*w 1 2 1 o*o*w 120" 0'0'\'J PG&E Letter DCL-15-034 Enclosure 1 O'O'N Flooding Hazard Reevaluation Report Diablo Canyon Power Plant Figure 3-12 Physiographic Features in the DCPP Area

+ -+-+ +. + + + +* + + + + + + .J_ + + + I + + +. I './:I 1,,', *r 'j I .+ + *+ + + ' + +. t + + ! E x p l an a ti on 0 D iab l o Ca n y o n P o we r P la n t (D C P P) --F a ult --R u p t u re scen ar i o + .. + 1:-.+ +l, + C F-C a s m a li a r a _ t zo n e HF-Ho sg li f a ult zo ne P S -P uri s i m a s tr u c tur e PG&E Letter DCL-15-034 Enclosure 1 SLBF-S Zll t a w o a B ank s fa u l t zo n e SLB F-S an ta LU c i a B a nks f a u tt zo ne-sou th S C F -Sm.ttJi we st C harnel fa u l t W BF -W es t Ba s 1 n f a u l t 0 1 0 ?Q e t e r s '""'""' Flooding Hazard Reevaluation Report Diablo Canyon Power Plant Figure 3-13 Fault Zones Used in the RPMT Modeling a 12o*oo* 120°30' 120°00' SCIF =Santa Cruz Island Fault SSYF =South Santa Ynez Fault NCSF =North Channel Slope Fault RMF = Red Mountain Fault From Greene et al. (2006) PG&E Letter DCL-15-034 Enclosure 1 119 , 0 30' 119" 30' PPF =Pita Point Fault ORF =Oak Ridge Fault SYF =Santa Ynez Fault MCT = Mid channel Trend n CALIFORNIA Flooding Hazard Reevaluation Report Diablo Canyon Power Plant Figure 3-14 Location of Goleta and Gaviota Slides 124"\111 123"UV E x planation

......... Major fan valley MFV Monterey fan valley AFV Ascension fan valley MEFV East fan valley Headwall scarp of Sur Slide DCPP Diablo Canyon Power Plant 122"\111 Notes: PG&E Letter DCL-15-034 Enclosure 1 121"\111 1) Modified from G utmacl1er and Norm ark ( 1993 ). 2) Offshore base map dfrorn NCDC/NCAA Coastal Relief OEM (NDGC, 2005). 3) Onshore base map from U.S.G .S. 90-meter OEM. 0 I 50 100 Kilometers I Flooding Hazard Reevaluation Report Diablo Canyon Power Plant Figure 3-15 location of Sur Slide 122"30'W 122"111/ SM SB-Santa Maria Slope Break zone SSB-Sur Shelf Break zone ACZ-Arguello-Conception zone SLBS -Santa Lucia Bank scarp zone LSC-Lower Slope Canyon zone SSL-Southern Santa Lucia Basin zone ENSZ-Escarpment-northern Sur zone ENZ-Escarpment-northern zone ECZ-Escarpment-central zone ESZ-Escarpment-southern zone 121"30'W 121"111/ E x planation PG&E Letter DCL-15-034 Enclosure 1 120"30'W DCPP Diablo Canyon Power Plant CJ Landslide source zones 0 I 40 I 80 Kilometers I Flooding Hazard Reevaluation Report Diablo Canyon Power Plant Figure 3-16 Landslide Source Zones Used in Previous Tsunami Analyses 35.25 35.2 PG&E Letter DCL-15-034 Enclosure 1 0 -100 -200 J.o 0 z -300 35.1 "0 --400 35.05 = .-::: --500 35 -600 34.95 -700 34.9 -800 121.2 121.1 121 120.9 120.8 Longitude (deg. West) The black ellipse is thew =1 0.5 km by b = 7.45 km footprint of a 1.75 km3 slide on the slope, with center of mass located at 35.153N-120.985W.

The black straight line is a transect in the direction of the steepest slope from DCPP in azimuth 8 = 245 deg. from North. Bathymetry is color scale in meters. Flooding Hazard Reevaluation Report Diablo Canyon Power Plant Figure 3-17 Goleta SMF Proxy Location and Bathymetry 35.6 35.4 -.c 35.2 z "'0 -35 "'0 = *..: 34.8 34.6 34.4 122.6 122.4 122.2 122 121.8 121.6 Longitude ( deg. West) PG&E Letter DCL-15-034 Enclosure 1 0 -500 -1000 -1500 -2000 -2500 -3000 -3500 -4000 -4500 121.4 Black ellipses are the w = 10 km by b = 15 km footprint of 4.5 (or 1 0.5) km3 slides on the slope, with center of mass located at 35.097N-121.904W and 34.993N-121.872W, respectively.

The black straight lines are transects in the direction of the steepest slope in azimuths 8 = 255 and 290 deg. from North, respectively.

Bathymetry is color scale in meters. Flooding Hazard Reevaluation Report Diablo Canyon Power Plant Figure 3-18 Big Sur SMF Proxy Location and Bathymetry El. 52.3 ft FO,U= PG&E Letter DCL-15-034 Enclosure 1 Snorkels El. 48.5 ft El. 34.9 ft

• Top O&k I [ El. 20.4 ft I Air Curtain Wall El. -4.9 ft __ __..,.i-.---1 Bar rack Forebay El. -28.6 ft ---.------' ASW pump room Forebay Ceiling ] ASW Forebay I Flooding Hazard Reevaluation Report Diablo Canyon Power Plant Figure 3-19 Elevation Profile of SSCs of Intake Structure (NAVD88)

ASW Huts Intake Top Deck Curtain Wall PG&E Letter DCL-15-034 Enclosure 1 0.7 ksf 0.8 ksf Flooding Hazard Reevaluation Report Diablo Canyon Power Plant Figure 3-20 RPMT Hydrodynamic

& Hydrostatic Forces on the Intake Structure Regulatory Commitment Enclosure 2 PG&E Letter DCL-15-034 Page 1 of 1 Pacific Gas and Electric Company (PG&E) is making the following regulatory commitment (as defined by NEI 99-04) in this submittal:

Commitment Due Date PG&E has implemented, and will maintain, interim actions as set forth in Enclosure 1 until PG&E *has completed the March 13, 2017 Integrated Assessment Report.