ML25324A311

Enclosure 4: PSAR Subsection 2.4.5, Probable Maximum Surge and Seiche Flooding

ML25324A311
Person / Time
Site:	05000614, 99902117
Issue date:	11/20/2025
From:	Long Mott Energy
To:	Office of Nuclear Reactor Regulation
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ML25324A306	List: ML25324A307 ML25324A308 ML25324A309 ML25324A310 ML25324A311 ML25324A312
References
2025-PLM-NRC-013
Download: ML25324A311 (1)

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Enclosure 4 to Long Mott Energy, LLC, Letter No. 2025-PLM-NRC-013 Long Mott Energy, LLC PSAR Subsection 2.4.5, Probable Maximum Surge and Seiche Flooding

Long Mott Generating Station Preliminary Safety Analysis Report Section 2.4 Hydrology 2.4.5-i November 2025 CHAPTER 2 SUBSECTION 2.4.5 PROBABLE MAXIMUM SURGE AND SEICHE FLOODING LIST OF TABLES Number Title 2.4.5-1 Probable Maximum Hurricane Characteristics 2.4.5-2 Summary of Historical Hurricane Events on the Texas Gulf Coast 2.4.5-3 Hypothetical Landfall Coordinates 2.4.5-4 Synthetic Hurricane Parameters 2.4.5-5 SLOSH Grid Cell Indices, Latitude, and Longitude of Locations Selected for Model Validation, Verification, and Analysis 2.4.5-6 Modeled (SLOSH) and Observed (NOAA)

Maximum Total Water Elevation and Time of Maximum Total Water Elevation for Hurricane Harvey 2.4.5-7 SLOSH-Modeled Maximum Total Water Elevation versus Observations for Hurricane Carla 2.4.5-8 Storms Selected for Detailed ADCIRC+SWAN Modeling 2.4.5-9 Maximum Values of ADCIRC+SWAN Production Runs at LMGS Site

Long Mott Generating Station Preliminary Safety Analysis Report Section 2.4 Hydrology 2.4.5-ii November 2025 LIST OF FIGURES Number Title 2.4.5-1 Long Mott Generating Station Site Location and NOAA Tide Gauge Locations 2.4.5-2 Historical Hurricane Tracks Intersecting the Study Area (200 Km Radius from Seadrift, TX) 2.4.5-3 Distribution of Hurricane Central Pressure at Landfall for Hurricanes that Made Landfall on the Texas Gulf Coast 2.4.5-4 Alignment of Synthetic Storm Tracks 2.4.5-5 Hypothetical Landfall Locations 2.4.5-6 Matagorda Bay (2007) Basin with Long Mott Generating Station Site Identified as Dry 2.4.5-7 Storm Tracks for Hurricanes Harvey (2017) and Carla (1961) 2.4.5-8 Modeled (SLOSH) and Observed (NOAA) Total Water Elevation at Seadrift, Texas for Hurricane Harvey 2.4.5-9 Modeled (SLOSH) and Observed (NOAA) Total Water Elevation at Port OConnor, Texas for Hurricane Harvey 2.4.5-10 Modeled (SLOSH) and Observed (NOAA) Total Water Elevation at Port Lavaca, Texas for Hurricane Harvey 2.4.5-11 Modeled (SLOSH) and Observed (NOAA) Total Water Elevation at Aransas Wildlife Refuge, Texas for Hurricane Harvey

Long Mott Generating Station Preliminary Safety Analysis Report Section 2.4 Hydrology 2.4.5-iii November 2025 2.4.5-12 Modeled (SLOSH) and Observed (NOAA) Total Water Elevation at Rockport, Texas for Hurricane Harvey 2.4.5-13 SLOSH Maximum Surge from Hurricane Carla Compared to Historical Observations 2.4.5-14 Hurricane Carla (1961) SLOSH-Modeled Total Water Elevation (in Ft. NAVD 88) at Seadrift, Port OConnor, Port Lavaca, Aransas Wildlife Refuge, and Rockport 2.4.5-15 SLOSH-Modeled Maximum Total Water Elevation for All 1440 Production Runs (Variable Central Pressure Difference Case) 2.4.5-16 Full Domain Grid Spacing of the NOAA HSOFS Grid 2.4.5-17 Grid Spacing of HSOFS Grid in Matagorda Bay and San Antonio Bay Area 2.4.5-18 Bathymetry and Topography of Improved HSOFS Grid in the Area of Increased Resolution 2.4.5-19 Detail of Topography of Improved HSOFS Grid in the Area of Increased Resolution 2.4.5-20 Hurricane Harvey Track and Location of Validation Sites (Triangles for Water Level and Squares for Waves) 2.4.5-21 Comparison of Storm Surge Model Results with Observations at Seadrift and Port OConnor Due to Hurricane Harvey 2.4.5-22 Comparison of Significant Wave Height Model Result and Observations at NDBC Stations 42020 and 42019 Due to Hurricane Harvey

Long Mott Generating Station Preliminary Safety Analysis Report Section 2.4 Hydrology 2.4.5-iv November 2025 2.4.5-23 Hurricane Nicholas Track and Location of Validation Sites (Triangles for Water Level and Squares for Waves) 2.4.5-24 Comparison of Storm Surge Model Results and Observations at Port OConnor and Port Lavaca for Hurricane Nicholas 2.4.5-25 Comparison of Significant Wave Height Model Results and Observations at NDBC Stations 42020 and 42019 for Hurricane Nicholas 2.4.5-26 ADCIRC+SWAN Predicted Time Series of Water Surface Elevation, Significant Wave Height, Wind Speed, and Current Speed at LMGS for Storm 260 2.4.5-27 Hydrostatic and Hydrodynamic Forces on Safety-Related Structures

Long Mott Generating Station Preliminary Safety Analysis Report Section 2.4 Hydrology 2.4.5-v November 2025 ACRONYMS AND ABBREVIATIONS Acronym/Abbreviation Definition ADCIRC ADvanced CIRCulation model ANSI/ANS American National Standards Institute/American Nuclear Society AWL antecedent water level CEM Coastal Engineering Manual CUDEM NOAA Continuously Updated Digital Elevation Model ft feet ft2/s square feet per second HSOFS NOAA Hurricane Surge On-Demand Forecast System in.

inch(es) in. Hg inch(es) Mercury km kilometer(s) kt knot(s)

LMGS Long Mott Generating Station m

meter(s) m/s meter(s) per second m2/s square meter(s) per second mb millibar(s) mi mile(s) min minute(s) mm millimeter(s)

Long Mott Generating Station Preliminary Safety Analysis Report Section 2.4 Hydrology 2.4.5-vi November 2025 MSL mean sea level NAVD 88 North American Vertical Datum of 1988 NDBC NOAA National Data Buoy Center nm nautical mile(s)

NOAA National Oceanic and Atmospheric Administration NWS National Weather Service NWS 23 NOAA NWS Report 23 PMH probable maximum hurricane PMSS probable maximum storm surge psf pound(s) per square foot s

second(s)

SLR sea level rise SLOSH NOAA Sea Lake and Overland Surge from Hurricanes (computer model)

SWAN Simulating WAves Nearshore USACE United States Army Corps of Engineers WNA Western North Atlantic WSEL water surface elevation

Long Mott Generating Station Preliminary Safety Analysis Report Section 2.4 Hydrology 2.4.5-1 November 2025 Chapter 2 Site Characteristics 2.4 HYDROLOGY 2.4.5 PROBABLE MAXIMUM SURGE AND SEICHE FLOODING The following site-specific information describes the effects of probable maximum surge and seiche flooding on the safety-related facilities at the Long Mott Generating Station (LMGS) site.

2.4.5.1 Probable Maximum Winds and Associated Meteorological Parameters The probable maximum storm surge (PMSS) is defined in Subsection 2.4.5 of NUREG-0800 as the surge that results from a combination of meteorological parameters of a probable maximum hurricane (PMH), a probable maximum windstorm, or a moving squall line and has virtually no probability of being exceeded in the region involved.

Based on historical tide gauge records described in Subsection 2.4.5.2, it is evident that the meteorological event that would produce the PMSS along the Texas Gulf Coast near the LMGS site would be a PMH.

According to Subsection 2.4.5 of NUREG-0800, for sites such as the LMGS site that are not located on the Great Lakes or any other lake, moving squall lines or the probable maximum windstorm would not produce the PMSS.

As defined by National Oceanic and Atmospheric Administration (NOAA) National Weather Service (NWS) Report 23 (NWS -23), the PMH is a hypothetical steady state hurricane having a combination of values of meteorological parameters that will give the highest sustained wind speed that can probably occur at a specified coastal location (NWS, 1979).

The meteorological parameters that define the PMH wind field include the hurricane peripheral pressure (pp), central pressure (pc), radius of maximum winds (Rm), forward speed (T), and track direction ().

The PMH parameters at the Texas Gulf Coast near the LMGS site are obtained from NOAA Technical Report NWS-23 (NWS -23) and are summarized in Table 2.4.5-1. The PMH parameter values were established based on data from historical hurricanes from 1851 -- 1977 and were presented for multiple locations along the Gulf and Atlantic Coast shoreline in accordance with their milepost distances from the United States-Mexico border. The milepost distance to the shoreline location nearest to the LMGS site is estimated to be 290 nautical miles (nm) (NWS, 1979-23).

The pressure difference between the hurricane peripheral and central pressures, p, is identified as the most important meteorological parameter in defining the hurricane wind field (NWS, 1979-23). NOAA Technical Report NWS -23 provides single values of PMH peripheral and central pressures along the mileposts. However, a range of values (i.e., lower and upper bounds) is provided for the other PMH parameters. At milepost 290 nautical mim., the PMH peripheral and central pressures are 30.12 in. Hg (1020 mb) and 26.19 in. Hg (886.9 mb),

respectively, with a p of 3.93 in. Hg, or 133.1 mb. An ambient atmospheric pressure of 1015 mb was assumed based on observations. The corresponding lower and upper bounds of the radius of maximum wind are 5 and 21 nautical minm (9.3 and 38.9 km). The lower and upper

Long Mott Generating Station Preliminary Safety Analysis Report Section 2.4 Hydrology 2.4.5-2 November 2025 bounds of the forward speed are 6 and 20 kt (11.1 and 37.0 km per hour). The track direction,

, is found to be dependent on the hurricane forward speed, and the lower and upper bounds of are given as 86 and 191 degrees (clockwise from the north), respectively. The maximum 1-min, 10-m sustained wind speed reasonably possible in this region is 154.3 kt (285.8 km per hour).

The effect of long-term climate variability on hurricane intensity is an area of active research.

Since 1977, several intense hurricanes have made landfall on the Gulf of Mexico Coast, including Hurricanes Katrina and Rita in 2005 and Hurricane Harvey in 2017, the three most intense hurricanes in recent times. The most severe hurricane that made landfall near the LMGS site shoreline is the Indianola Hurricane of August 1886, with central pressure of 27.33 in. Hg, or 925 mb, as described in Subsection 2.4.5.2.1.

The PMH central pressure for the Gulf Coast near the LMGS site (i.e., 886.9 mb) is lower than the central pressure of the most intense hurricane recorded in history (i.e., 925 mb, Indianola 1886). Because NOAA Technical Report NWS-23 (NWS -23) includes the last active hurricane period from 1945 to 1970 (and any such earlier periods from 1851) in the analysis (NWS, 1979),

it is reasonable to assume that the PMH parameters thus derived are sufficiently conservative even when considering future climate variability.

2.4.5.2 Surge and Seiche Water Level The LMGS site is located on the north-east corner of San Antonio Bay at latitude 28.525°,

longitude 96.765° (Figure 2.4.5-1), on Coloma Creek approximately 16 mi. (26 km) upstream from its confluence with Powderhorn Lake, Texas. The storm surge at the LMGS site is caused by the coastal storm surge in the vicinity of the San Antonio River and mouth of the Coloma Creek through Matagorda Bay.

The natural ground at the site varies in elevation from approximately 26 ft (8.3 m) to above 28 ft (8.5 m) in North American Vertical Datum of 1988 (NAVD 88). The finished floor grade of all safety-related structures is at elevation 31.5 ft (9.6 m) NAVD 88. The PMSS at the site is postulated to be caused by storm surges that would propagate upstream through the San Antonio Bay system as well as Matagorda Bay and Coloma Creek from the Gulf of Mexico shoreline. Figure 2.4.5-1 shows the location of the site relative to the Texas Gulf Coast, the San Antonio Bay, and the Matagorda Bay-Coloma Creek system. Because the site is not located on an open coast or a large body of water, seiche events would not affect the site.

2.4.5.2.1 Historical Hurricane Events and Storm Surge A list of hurricanes that made landfall on the Texas Gulf Coast from 1851 to 2023 is presented in Table 2.4.5-2 (Blake, et al. 2007 2011 and NOAA, 2024a). Figure 2.4.5-2 shows the tracks of all hurricanes in the Gulf of Mexico from 1851 to 2023 with intensities of Hurricane Category 1 and above on the Saffir-Simpson Hurricane Scale. Figure 2.4.5-3 shows the variation in the central pressures of the hurricanes tabulated in Table 2.4.5-2. As indicated in Table 2.4.5-2 and Figure 2.4.5-3, the August 1886 Indianola Hurricane was the most intense hurricane that affected the Texas Gulf Coast. The hurricane made landfall on the Calhoun County, Texas, coast near the LMGS site, as shown on Figure 2.4.5-2.

The next most severe hurricane that made landfall near the LMGS site was Hurricane Carla in September 1961. This Category 4 hurricane made landfall on the Matagorda Bay coast and

Long Mott Generating Station Preliminary Safety Analysis Report Section 2.4 Hydrology 2.4.5-3 November 2025 resulted in a surge water level of about 16.6 ft (5.1 m) above mean sea level (MSL) at Port Lavaca (USACE, 1975), which based on the vertical datum conversion is approximately 17.3 ft (5.3 m) NAVD 88 factor at Rockport, Texas (NOAA, 2024b). A high-water line varying from 15.7 to 22 ft (4.8 to 6.7 m) above MSL (approximately 16.4 to 22.7 ft, or 5.0 to 6.9 m, NAVD 88) was established based on debris lines near the head of Lavaca Bay, including, probably, the effects of wave setup and run-up (USACE, 1975).

The most severe hurricane within the past decade was Hurricane Harvey in September 2017.

This Category 4 hurricane made landfall on the Aransas Bay coast and resulted in a surge water level of about 7.2 ft (2.2 m) above MSL at Port Lavaca (NOAA, 2024c), which based on the vertical datum conversion factor is approximately 7.9 ft (2.4 m) NAVD 88 at Rockport, Texas (NOAA, 2024b). The highest inundations (8 to 10 ft above ground level) likely occurred along the western shores of San Antonio Bay and adjacent Hynes Bay (Blake and Zelinsky, 2018).

Storm surges from severe hurricanes in the Gulf of Mexico region with landfall beyond the Texas Coast, as shown on Figure 2.4.5-2, could also affect the coastal region near the LMGS site. However, the impact of such hurricane surges on the LMGS site would be small.

2.4.5.2.2 Storm Surge Analysis The maximum storm surge elevation at the LMGS site is estimated based on the propagation of the PMSS through the San Antonio Bay and Matagorda Bay-Coloma Creek system. A step-wise approach consistent with the Hierarchical Hazard Assessment methodology described by NUREG/CR-7046, Design Basis Flood Estimation for Site Characterization at Nuclear Power Plants, was used to deterministically evaluate the PMSS stillwater elevation (i.e., the elevation of the surface of the water in the absence of waves and wave set-up) at the LMGS site. As discussed below, two different hydrodynamic models were applied in a phased approach.

In a first phase of modeling, a screening-level assessment was performed using the two-dimensional NOAA Sea Lake and Overland Surge from Hurricanes (SLOSH) computer model, version 4.22 (NOAA, 2021 and NOAA, 2017). The SLOSH model is computationally efficient, allowing many simulations to be performed over a relatively short period of time. However, the SLOSH model has limitations, including its relatively coarse, structured model grid and the inability to represent dynamic tides and external boundary fluxes (e.g., river flow). Therefore, in a second phase of modeling (i.e., refinement-level assessment), additional simulations will bewere performed using the ADvanced CIRCulation (ADCIRC) model (Westerink et al., 1994).

While ADCIRC is not hindered by many of the limitations associated with SLOSH, the high-resolution, finite-element mesh and related high computational demand prevent broad applications (i.e., only a limited number of storm simulations is practicable in the context of a given analysis). Thus, ADCIRC will bewas applied in a targeted fashion (i.e., refinement-level assessment) to further evaluate the storms identified during the screening-level assessment that are predicted to cause large surges at the LMGS site and to develop the final PMSS stillwater elevations. The ADCIRC model is integrated with the SWAN (Simulating WAves Nearshore) model to incorporate the effects of ocean surface waves in surge calculations. The screening level assessment is described in Subsection 2.4.5.2.2.5 and the Additional site-specific analyses and associated information that includes the refinement level assessment using ADCIRC will be provided by the end of 2025. refined PMSS analysis is described in Subsection 2.4.5.2.2.6. Although the

Long Mott Generating Station Preliminary Safety Analysis Report Section 2.4 Hydrology 2.4.5-4 November 2025 The SLOSH model does not account for the ocean surface wave component of storm surge.,

the ADCIRC model is integrated with the SWAN (Simulating WAves Nearshore) model to incorporate the effects of ocean surface waves in surge calculations. Preliminary analysis indicateds that the SLOSH model predicts higher water surface elevations (WSEL) than ADCIRC in this region. Thus, it was expected that SLOSH model results would bound those of the refined PMSS analysis. The results of the refined analysis using ADCIRC, without accounting for wave run-up, confirmed this prediction. Wave run-up was then added to this water level using SWAN. The conservatism inherent in SLOSH can be partially offset by the wave impacts generated by SWAN. Therefore, the water surface elevation results obtained from SLOSH and presented herein are expected to be bounding.

2.4.5.2.2.1 Generation of an Initial Storm Set An Initial Storm Set was generated using the PMH parameters described in Subssection 2.4.5.1.

The following tropical cyclone parameters were considered in developing the Initial Storm Set:

Radius of maximum winds Storm forward speed Storm bearing (i.e., storm heading relative to due north)

Central pPressure deficit Landfall locations The potential PMH parameters and parameter ranges are summarized in Table 2.4.5-1 and Table 2.4.5-3Table 2.4.5-4.

Synthetic storm tracks were first created by combining nine potential storm bearings (i.e., +80 degrees° to +200 degrees° in 15 degree° intervals) with eight potential landfall locations (Figure 2.4.5-4 and Figure 2.4.5-5) spanning the distances between NWS - 23 mMilep Posts 230 and 300 (NWS, 1979-23). The coordinates of these landfall locations are provided in Table 2.4.5-3. These landfall location selections reflect the understanding that regional storm surge (i.e., open-ocean surge approaching the coastline) must pass through the eastern opening of San Antonio Bay as well as Matagorda Bay and be routed to the vicinity of the LMGS site. Storms making landfall to the west of mMilep Post 230 and to the east of mMile Ppost 300 are not likely to maximize these conditions based on storm size restrictions, as indicated by the PMH parameters established in Subsection 2.4.5.1, and/or misalignment between maximum winds and direct routes to the LMGS site (i.e.,

the momentum required to carry very large storm surges to the LMGS site would not be maintained). Seventy-two storm tracks were created based on these nine potential bearings and eight potential landfall locations. Each potential storm track was then expanded into a set of storms using the ranges of forward speed and radius of maximum wind. Whereas a single maximum wind speed was determined for each bearing, the radius of maximum winds and forward speed parameters were presented as ranges (i.e.,

with upper and lower bounds varying by bearing). Thus, in generating the Initial Storm Set, each range was divided into units of 5 mi and 5 kt, respectively, and a unique hypothetical (i.e., synthetic) storm was created for each combination of values. The upper

Long Mott Generating Station Preliminary Safety Analysis Report Section 2.4 Hydrology 2.4.5-5 November 2025 and lower bounds of the ranges presented in the PMH calculation do not necessarily correspond to multiples of 5 mi or 5 kt; therefore, in generating the Initial Storm Set, the ranges were rounded to the nearest multiple (i.e., to span each range). The resulting Initial Storm Set included 1440 unique synthetic storms, each with a unique storm identification number.

2.4.5.2.2.2 Adjustment of Central Pressure Deficit SLOSH is a dynamic, two-dimensional, numerical finite-difference computer model used to estimate storm surge heights and winds resulting from historical, hypothetical, or predicted hurricanes. The SLOSH model was developed by the NOAA NWS Meteorological Development Laboratory based in Silver Spring, Maryland. The SLOSH model requires input representing storm track coordinates (i.e., direction and translational speed), radius of maximum winds, and central pressure deficit (i.e., the absolute difference between the peripheral/ambient pressure and the minimum pressure at the center of the storm) to calculate storm surge heights. The model accounts for both the hurricane wind field and the pressure differential when calculating storm surge (NOAA, 1992). SLOSH uses a simplified parametric wind model based on central pressure deficit and radius of maximum winds to calculate the surface stresses over water that generate storm surge. One half of the hurricane's forward speed is added vectorially to the symmetric winds to provide wind field asymmetry (NOAA, 1992) due to the storm translational speed. SLOSH uses a look-up procedure to derive a maximum wind speed for use in the internal wind model based on several input parameters, including central pressure deficit, radius of maximum winds, and latitude of the center of the model mesh. Maximum wind speed is not directly accepted as input (NOAA, 2021).

Sensitivity analysis on the synthetic storm tracks showed that the wind velocity exceeds the upper limit of wind speed established in Subsection 2.4.5.1. Therefore, central pressure deficit was adjusted through trial and error to limit the maximum wind speed below the acceptable upper limit. The calculated central pressure deficit according to NWS - 23 (see Subsection 2.4.5.1) is 133.1 mb (NWS, 1979). The adjusted central pressure deficit varied in synthetic storm sets from 100 mb to 133.1 mb based on maximum velocity calculated by SLOSH program.

All PMH parameters, including revised central pressure deficit, are provided in Table 2.4.5-4.

2.4.5.2.2.3 Calculation of the Antecedent Water Level In accordance with NUREG/CR-7046, the PMSS is required to be evaluated coincident with an antecedent water level (AWL) equal to the ten percent exceedance high tide plus long-term changes in sea level. The ten percent exceedance high tide is defined as the high tide level that is equaled or exceeded by ten percent of the maximum monthly tides over a continuous 21-year period. In accordance with American National Standards Institute/American Nuclear Society (ANSI/ANS) standard ANSI/ANS-2.8-1992, Determining Design Basis Flooding at Power Reactor Sites, this tide can be determined from recorded tide data or from predicted astronomical tide tables (ANSI/ANS, 1992).

An AWL was calculated using data obtained from the Rockport, Texas, NOAA tidal gaging station as per NUREG/CR-7046; ANSI/ANS, 1992; and Regulatory Guide 1.59, Revision 2, Design Basis Floods for Nuclear Power Plants. Observed and verified monthly maximum tide data obtained over a continuous 21-year period (January 1, 2000, through December 31, 2021)

Long Mott Generating Station Preliminary Safety Analysis Report Section 2.4 Hydrology 2.4.5-6 November 2025 were used to calculate the 10 percent exceedance high tide. Cumulative sea level rise (SLR) was then added to obtain the AWL. The records were sorted from highest to lowest elevation and assigned ranks in an Excel spreadsheet. Several identical values were identified; these values were assigned equal ranks and consecutive ranking was ignored (i.e., ranks are skipped for tied values, but the lowest record had a rank equal to 250). For each record, the probability of exceedance was calculated using the Weibull form of the general plotting position equation.

The 10 percent exceedance high spring tide at the Rockport NOAA station (NOAA, 2024b) is estimated to be about 2.8 ft (0.85 m) NAVD 88.

In accordance with guidance from JLD-ISG-2012-06, Guidance for Performing a Tsunami, Surge, or Seiche Hazard Assessment, the long-term (i.e., plant life cycle) effect of SLR was estimated and included in the calculation of the AWL (NRC, 2013). The location closest to the site that has long-term SLR data available is Rockport, Texas, at 5.97 mm (0.24 in.) per year.

Assuming that sea level in the region continues to rise at the same rate, an SLR of 1.2 ft (358 mm) is postulated for a 60-year period. Therefore, the AWL applied to the estimated deterministic PMSS is 4.0 ft NAVD 88 (i.e., 2.8 ft NAVD 88 + 1.2 ft) (1.2 m).

2.4.5.2.2.4 SLOSH Model Verification The Matagorda Bay basin grid (Figure 2.4.5-6) was used in estimating storm surge associated with each of the 1440 synthetic hurricane tracks. The highest resolution is over the Matagorda Bay area, which is not far from the LMGS site in Calhoun County, Texas. The latest update made to the basin was in 2007 and elevations are referenced to NAVD 88 (SLOSH, 2021).

SLOSH results are extracted for six grid cells for the PMSS and verification analysis as presented in Table 2.4.5-5.

Two major historical hurricanes, Harvey (2017) and Carla (1961), were used to verify SLOSH and estimate uncertainty associated with estimating surge. These hurricanes are examples of the highest intensity events that could affect the area around the LMGS site. Hurricane Harvey is the primary scenario for the verification, validation, and determination of the uncertainty of the SLOSH model because of the availability of measured water level, meteorological data, and high-water observations. Storm track parameters, including latitude and longitude, minimum pressure, and radius of maximum winds, were obtained from the NOAA's International Best Track Archive for Climate Stewardship dataset (Knapp et. al. 2010). Figure 2.4.5-7 shows the tracks of these storms as they approach the coast near the LMGS site. Harvey and Carla made landfall west and east of the site, respectively.

The time series of SLOSH-modeled and NOAA tide gauge-observed surge at Seadrift, Port O'Connor, Port Lavaca, Aransas Wildlife Refuge, and Rockport during Hurricane Harvey are shown in Figure 2.4.5-8 through Figure 2.4.5-12. Maximum surge values and time of maximum surge for all five locations are presented in Table 2.4.5-6. At Seadrift, the station closest to the LMGS site, SLOSH underestimated the maximum surge by 1.18 ft (0.36 m) and the peak surge predicted by the model was almost four hours earlier than observed. For comparison, in a study where the ADCIRC+Simulating Waves Nearshore (SWAN) model was used to simulate Hurricane Harvey (Shamsu and Akbar, 2023), the surge at Seadrift was underestimated by 1.31 ft (0.40 m).

The SLOSH model performed the best at Port O'Connor, overestimating the surge by 0.26 ft (0.08 m) and predicting the modeled peak surge occurring less than an hour earlier than observed. At Aransas Wildlife Refuge, SLOSH overestimated the maximum total water elevation

Long Mott Generating Station Preliminary Safety Analysis Report Section 2.4 Hydrology 2.4.5-7 November 2025 by 0.45 ft (0.14 m), and the timing of the maximum total water elevation in the model was less than an hour later than observed. The tide gauge at Rockport (Figure 2.4.5-12) failed during Hurricane Harvey because the storm had a direct impact at this location. Port Lavaca had the largest SLOSH-modeled difference when compared to the observations; it underestimated the maximum total water elevation by 1.29 ft (0.39 m), with the maximum elevation occurring slightly more than four hours earlier.

In the case of Hurricane Carla, no direct time-series measurement data are available. Validation of the SLOSH model for this event is based on storm surge values along the Texas coast reported by Sugg and Pelissier (Sugg and Pelissier, 1968). Figure 2.4.5-13 shows the mapped SLOSH model output and the reported surge and high-water mark values. The reported surge values map indicates that the maximum surge around Port Lavaca was on the order of 16 ft to 22 ft (4.9 to 6.7 m) and 11.0 ft to 12.3 ft (3.4 to 3.7 m) around Port O'Connor. Time-series of the SLOSH-modeled surge at the three locations are shown in Figure 2.4.5-14, and the maximum surge and time of maximum surge are presented in Table 2.4.5-7. The maximum surge at Port Lavaca (19.0 ft [5.8 m]) corresponds to the range reported in Sugg and Pelissier, 1968, while the 9.3 ft [2.8 m] maximum at Port O'Connor underestimates the surge reported in Sugg and Pelissier, 1968. SLOSH also underestimates the surge at Aransas Wildlife Refuge (4.80 ft [1.46 m] compared to 6.30 ft [1.92 m] reported). Near Seadrift, a surge of 10.0 ft (3.0 m) was reported, while SLOSH estimates a maximum surge of 6.0 ft (1.8 m) in that area. Overall, the surge pattern in SLOSH is representative of the reported surge in Sugg and Pelissier, 1968, with higher surge to the right of the track, where the winds blow from sea to land, and lower surge to the left of the track.

Based on the model validation of Hurricane Harvey, the accuracy of the model for maximum total water elevation is between negative 8 percent and positive 20 percent. This range is in agreement with Forbes et al., 2014, who reported water elevation accuracy of between 10 percent and 20 percent when using SLOSH to model Hurricane Sandy. Therefore, for the SLOSH results in the screening-level assessment (Subsection 2.4.5.2.2.5), the maximum total water levels are increased by 10 percent to account for SLOSH model uncertainty.

The LMGS site was not flooded during any of these historical events, as also discussed in Section 2.4.2.

2.4.5.2.2.5 Screening-Level Assessment (SLOSH)

Screening-level storm surge simulations were performed using the SLOSH model, the Initial Storm Set, and the AWL. These simulations were performed to identify: 1) the sensitivity of storm surge at the LMGS site to different storm parameters (i.e., storm track, radius of maximum winds, etc.) as constrained by the PMH parameters; and 2) the specific combinations of storm parameters and storm tracks that result in the largest predicted storm surges at the LMGS site, also constrained by the PMH parameters. The screening-level simulations performed using SLOSH assumed steady-state conditions (i.e., storm parameters were not varied from the initial specifications).

The primary model inputs include:

Operational SLOSH 4.22 basin/gridprovided by NOAA with integrated topography, bathymetry, geographic features, and obstructions.

Long Mott Generating Station Preliminary Safety Analysis Report Section 2.4 Hydrology 2.4.5-8 November 2025 Initial Water Levelinitial condition for surge simulations. In this calculation, the initial water level was set equal to the AWL (refer to Subsection 2.4.5.2.2.3).

Storm Directionstorm track bearing in degrees (°), measured positive clockwise from north.

Landfall location coordinateslatitude and longitude in decimal degrees.

Storm Forward Speedstorm forward translational storm speed (kt).

Radius of Maximum WindsRadius of Maximum Winds in statute nautical mi.

Central Pressure Deficit(Central Pressure Deficit or difference between central and peripheral barometric pressures) (mb).

Most of these parameters are presented in Table 2.4.5-43. In generating input to SLOSH, nautical mi.nm were converted to mi. using a conversion factor of 1.15078. Input parameters are delivered to the SLOSH executable via a single input file (i.e., a track file,.trk file extension) that includes a series of one hundred track file points. Track file points represent the hurricane center position at hourly intervals.

The SLOSH-modeled maximum total water elevation for all 1440 variable central pressure difference scenario production runs is shown in Figure 2.4.5-15. These maximum water elevations were extracted at the SLOSH cell determined to represent the LMGS site in the model (i.e., cell [89,28]). Zero elevation values mean that the site cell was not flooded during the simulation; this occurred for 761 storm tracks.

Maximum water elevation ranged from 23 ft to 37.7 ft NAVD 88 (7.0 to 11.5 m) (prior to adjusting for the SLOSH uncertainty). The peak value of 37.7 ft corresponds to storm track 671.

A threshold of 6.7 ft above the raised site grade of 31 ft (9.4 m) NAVD 88 was considered for screening the most severe tracks. When applying an increase of 10 percent to the maximum total water elevation to account for the SLOSH model uncertainty, 534 storm tracks surpassed the raised site grade elevation of 31 ft (9.4 m) NAVD 88. The maximum adjusted PMSS water surface elevation at the LMGS site is 41.47 ft NAVD 88, which represents 10.47 ft of inundation.

From these 534 storm tracks, 15 storm tracks (see Table 2.4.5-8) were selected for further evaluation in ADCIRC+SWAN analysis. The following criteria were used to select these 15 storm tracks:

One storm from each set of storms that resulted in identical total water levels at the site was selected. Storms were selected to model a variable range of flooding from 3 ft to 10 ft (0.9 to 3.0 m).

2.4.5.2.2.6 Refined PMSS Analysis ADCIRC is a two-dimensional, depth-integrated, barotropic, time-dependent, long wave, hydrodynamic circulation model. It is a highly developed computer program for solving the equations of motion for a moving fluid on a rotating earth. These equations have been formulated using the traditional hydrostatic pressure and Boussinesq approximations. The equations have been discretized in space using the finite element method and in time using the finite difference method (Westerink et al., 2008).

Long Mott Generating Station Preliminary Safety Analysis Report Section 2.4 Hydrology 2.4.5-9 November 2025 The initial grid is from NOAA Hurricane Surge On-Demand Forecast System (HSOFS)

(Riverside Technology, Inc., and AECOM 2015). To incorporate the latest available bathymetry and topography and increase the grid resolution in the area of interest, an improved version of the NOAA grid was developed. HSOFS has been previously used in operational modeling of storm surge by NOAA (Zachary, et al. 2018) and for research studies (Ajimon, et al. 2022, Musinguzi, Reddy and Akbar 2022). The domain of the original HSOFS grid covers the Gulf of Mexico, the Caribbean Sea, and part of the Western North Atlantic (WNA) (Figure 2.4.5-16). At the larger scale, spatial resolution varies from 31.1 mi (50 km) in the WNA boundary, 6.2 - 18.6 mi (10 - 30 km) on the deeper non-shelf waters of the WNA, Caribbean Sea and Gulf of Mexico, and 3.1 mi (5 km) or less in all shelf waters. The domain scale spatial resolution is shown in Figure 2.4.5-16. In the area of interest, the spatial resolution of the original HSOFS grid varies from 820.2 ft (250 m) at selected narrow entrances and channels to 984.3 - 1640.4 ft (300 -

500 m) in the coastal plains and 1640.4 ft (500 m) or more at the inland boundary. At LMGS, the spatial resolution of the original HSOFS grid was on the order of 1640.4 ft. (500 m) and close to the inland boundary. The spatial resolution of the original HSOFS grid in the study area is shown in Figure 2.4.5-17.

Based on the local bathymetry, topography, and storm surge flood dynamics observed from the production SLOSH model results, the model resolution was increased in the area between Matagorda Bay to the east and the Aransas National Wildlife Refuge to the west. Creating the improved grid required extensive manual delineation of important features based on bathymetry and topography elevation, the coastline, and the target spatial resolution required. Satellite ortho-imagery was used to correctly place and delineate the jetty at the entrance of Matagorda Bay, which is the main channel entrance and which was not incorporated in the original HSOFS grid. The resulting improved grid has 2,244,498 nodes and 4,426,001 elements, while the original HSOFS grid had 1,813,443 nodes and 3,564,104 elements.

Figure 2.4.5-18 shows the grid spacing of the improved grid. In the improved grid the spatial resolution is as fine as 32.8 ft (10 m) in areas bordering Powderhorn Lake and Chocolate Bay.

Because the main source of overland flooding into LMGS comes from the Matagorda Bay side, the finest spatial resolution was placed along the borders of these water bodies as they extend far inland and are the major carriers of storm surge flooding into the LMGS site. The spatial resolution over the LMGS site is on the order of 98.4 ft (30 m) to 164.0 ft. (50 m), and the coastlines in the area of improved resolution are on the order of 328.1 ft. (100 m). In addition, the inland boundary of the model was moved farther north to allow additional spacing between the LMGS and the boundary.

In the area of improved grid resolution, all the original surface elevations were replaced with the most recently available data from the NOAA Continuously Updated Digital Elevation Model (CUDEM) 1/9 Arc-Second Resolution Bathymetric-Topographic Tiles (CIRES, 2014).

The depths in Matagorda Bay and San Antonio Bay are in the range of 0 ft (0 m) to 16.4 ft (5 m),

but with many obstructions caused by the barrier islands and sandbars that face the Gulf of Mexico. There is a deep navigational channel that connects the Gulf of Mexico with Matagorda Bay, with a jetty that cuts through the barrier island at the entrance of Matagorda Bay. These barrier islands and sandbars provide a natural dissipative effect on water levels, currents, and waves. Due to the high velocity and water surface gradients generated by hurricane forcing used in the production runs, it was of importance to aim for a spatial resolution on the order of 164 ft. (50 m) to account for these features in detail.

Long Mott Generating Station Preliminary Safety Analysis Report Section 2.4 Hydrology 2.4.5-10 November 2025 A detailed view (with a focus on elevations above 0 ft [0 m] NAVD 88) of the updated topography on the improved HSOFS grid is shown in Figure 2.4.5-19. Some of the tributary creeks reach up to approximately 12.4 mi (20 km) inland, providing the conditions for the storm surge flood originating in Matagorda Bay to propagate towards the LMGS site location. The land bordering these creeks has a height of 6.5 ft (2 m), which allows buildup of the storm surge and waves to further propagate inland. In contrast, the land bordering San Antonio Bay has no equivalent tributaries, and its height is on the order of 16.4 ft (5 m) to 22.9 ft (7 m), making it more difficult for a storm surge flood to reach the LMGS location.

Model Calibration and Verification:

The ADCIRC+SWAN model was calibrated for Hurricanes Harvey (2017) and Nicholas (2021).

Hurricane wind and atmospheric pressure fields were generated by ADCIRC using the Holland parametric wind model (ADCIRC input parameter NES = 8) (Holland, 1980). The inputs to the Holland model were central latitude and longitude, maximum wind speed, minimum barometric pressure, radius of maximum winds, and the 34-kt wind radius. ADCIRC internally calculates the hurricane translation speed and adds it to the hurricane wind field for additional wind field asymmetry. The inputs were sourced from NOAA Automated Tropical Cyclone Forecasting (NOAA, 2025) and the International Best Track Archive for Climate Stewardship (Gahtan, et al.

2024) databases and formatted as an ADCIRC input file.

Measurements from tide gauges were obtained from NOAA Tides and Currents (NOAA, 2024b) and data from the offshore wave buoys was obtained from the NOAA National Data Buoy Center (NDBC) (NDBC 2025a; NDBC, 2025b). Because the ADCIRC and ADCIRC+SWAN simulations did not include tide forcing, the numerically predicted storm surge for the selected historic hurricanes was compared against the observed storm surge (derived by subtracting the predicted tide-only water level from the measured water level at each tide gauge).

Hurricane Harvey:

The simulation of Hurricane Harvey was carried out for the period between August 25, 2017 00Z and August 26, 2017 18Z. The track and validation locations used for the simulation are shown in Figure 2.4.5-20. For Hurricane Harvey the ADCIRC and ADCIRC+SWAN water levels were validated at the NOAA tide gauges at Seadrift, Texas (red triangle), and Port OConnor, Texas (green triangle), and the ADCIRC+SWAN wave heights were validated at the NOAA NDBC wave buoys 42020 (blue square) and 42019 (red square) (NDBC 2025a; NDBC, 2025b).

Comparison of the ADCIRC and ADCIRC+SWAN predicted storm surge with observations is shown in Figure 2.4.5-21. ADCIRC estimates of surge at Seadrift and Port OConnor were notably lower than the measurements and markedly improved when the contribution of wave setup to storm surge was incorporated in ADCIRC+SWAN. At Seadrift the maximum observed surge was 5.6 ft (1.72 m), while the maximum ADCIRC surge was 3.7 ft (1.14 m) and the ADCIRC+SWAN surge was 5.7 ft (1.75 m). A recent study using the original HSOFS grid to simulate Hurricane Harvey with ADCIRC+SWAN (Shamsu and Akbar, 2023) reported a surge of 4.1 ft (1.25 m) at Seadrift, which is lower than measurements and predictions using the improved HSOFS grid. This finding shows that the improvements incorporated in the improved HSOFS grid yield more accurate storm surge estimates.

At Port OConnor, the observed maximum surge was 2.6 ft (0.78 m), while the maximum ADCIRC surge was 0.9 ft. (0.27 m), with ADCIRC+SWAN predicting a closer match of 2.7 ft

Long Mott Generating Station Preliminary Safety Analysis Report Section 2.4 Hydrology 2.4.5-11 November 2025 (0.83 m). At both locations the ADCIRC+SWAN surge signal followed a similar pattern to observations, especially at Port OConnor where ADCIRC+SWAN was able to partially capture the secondary surge that occurred following the main surge peak. For the ADCIRC results at Port OConnor, the secondary surge is absent, indicating that it is likely caused by wave action.

Comparison of the ADCIRC+SWAN significant wave height with the NOAA NDBC buoy observations is shown in Figure 2.4.5-22. At both locations the model calculated significant wave height higher than that observed at the peak of the event, especially at the Freeport buoy 42019. Maximum modeled significant wave height at 42020 was 27.1 ft (8.25 m) versus the observed 24.1 ft (7.34 m), while at 42019 the modeled maximum significant wave height of 30.2 ft (9.20 m) exceeded the observed 23.2 ft (7.08 m). The temporal pattern of the ADCIRC+SWAN wave heights generally agreed well with the observations.

Hurricane Nicholas:

The Hurricane Nicholas simulation was carried out for the period between September 13, 2021 06Z to September 14, 2021 12Z. The track and validation locations used for the simulation are shown in Figure 2.4.5-23. For Hurricane Nicholas the ADCIRC and ADCIRC+SWAN water levels were validated at the NOAA tide gauges at Port OConnor, Texas (red triangle), and Port Lavaca, Texas (green triangle), and the ADCIRC+SWAN wave heights were validated at the NOAA NDBC wave buoys 42020 (blue square) and 42019 (red square) (NDBC 2025a; NDBC, 2025b).

Comparison of the ADCIRC+SWAN storm surge predictions with observations at Port OConnor and Port Lavaca is shown in Figure 2.4.5-24. At Port OConnor ADCIRC+SWAN underestimated the surge (2.1 ft [0.65 m] vs. 2.7 ft [0.81 m] observed) while at Port Lavaca it overestimated the surge (2.7 ft [0.81 m] vs. 1.9 ft [0.59 m] observed). At both locations ADCIRC on its own produced lower surge estimates than when coupled with SWAN. The timing of the surge peak at both locations generally agreed well with the observations. Because the winds blow across Matagorda Bay from the east, there is a stretch of about 55 km (34 mi) across the bay over which the surge and wave field can grow after the initial dissipation as the hurricane moves from the Gulf and over the barrier islands.

The trends in predicted significant wave height for Nicholas resembled those of Hurricane Harvey (Figure 2.4.5-25). At NDBC station 42019 the model overestimated the peak significant wave height by approximately 4.9 ft. (1.5 m). In contrast, the model results at NDBC buoy 42020 did not exhibit this overprediction of wave height as the patch of elevated wave heights was located ahead and to the east side of the hurricane track. Upon landfall the behavior of the wave field resembles the previous hurricane cases and became depth-limited with the barrier islands causing an abrupt dissipation of the incoming waves from the Gulf of Mexico.

Production Runs:

The 15 storm parameter combinations presented in Table 2.4.5-8 are beingwere simulated using ADCIRC+SWAN. As described earlier in this section, additional site-specific analyses and associated information that includes ADCIRC results will be provided by the end of 2025. The production runs had a duration of 1.50 days with a 0.50 day ramp up period, a 0.1 s timestep and a 600 s coupling interval with SWAN. A surface elevation offset of 1.22 m (4 ft) was applied to ADCIRC+SWAN through the nodal attribute sea_surface_height_above_geoid. This

Long Mott Generating Station Preliminary Safety Analysis Report Section 2.4 Hydrology 2.4.5-12 November 2025 constant offset represents the contribution of SLR and 10 percent exceedance tide to the total WSEL caused by the atmospheric and wave forcing.

A spatially constant horizontal eddy viscosity of 107.6 ft2/s (10 m2/s) for the momentum equations was used for the model runs. This value was inherited from the original NOAA HSOFS fort.15 file. A minimum quadratic friction coefficient of 0.001 was defined based on the settings chosen during the initial model development phase. A maximum wind drag coefficient of 0.002, which is the standard value from the ADCIRC model documentation, was selected.

The maximum surface elevation, maximum significant wave height, associated wave direction, and maximum wind speed at the LMGS site for all the ADCIRC+SWAN production runs are shown in Table 2.4.5-9. The storm which causes the highest maximum surface elevation of 36.38 ft (11.09 m) NAVD 88 at the site is #260. This hurricane also resulted in the highest wind speed of 83.8 m/s (163 kt) at the site. Storms #491 and #671 follow with maximum WSEL of 31.52 ft (9.61 m) and 31.36 ft (9.56 m) NAVD 88, respectively.

The model output timeseries in Figure 2.4.5-26 show a peak in surface water elevation accompanied by the signature pattern of two wind speed peaks with a drop to almost zero as the hurricane eye tracks nearby. The duration of the storm surge flood at the site is about 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />. The significant wave height follows the same pattern as the wind speed with two peaks, with the first peak higher than the second.

2.4.5.3 Seiches and Resonance A seiche is defined as an oscillation of the water surface in an enclosed or semi-enclosed body of water initiated by an external cause. Once started, the oscillation may continue for several cycles; however, over time it gradually decays because of friction (NUREG/CR-7046; NRC, 2013).

Except for the cooling basin, the site is not located near a semi-enclosed or large body of water.

Atmospheric or other seiches are, therefore, unlikely to cause flooding at the safety-related structures at the site. Although seismic seiches are observed in the Gulf of Mexico and within the barrier islands along the Gulf coast, the seiche magnitudes are too small to affect the safety-related facilities at a finished floor grade elevation of 31.5 ft (9.6 m) NAVD 88. Therefore, flooding of the site due to seiches is not considered as a credible scenario.

2.4.5.4 Wave Action The coupled ADCIRC+SWAN model was used to simulate storm surge and waves due to the deterministic PMSS storm surge from the hypothetical hurricane that resulted in maximum stillwater elevation at the LMGS site. The analyzed significant wave height and peak period is 4.04 ft (1.23 m) and 2.8 s, respectively. Additional site-specific analyses and associated information that includes wave height and period will be provided by the end of 2025.

The methodology described in the United States Army Corps of Engineers (USACE) Coastal Engineering Manual (CEM) (USACE, 2011) was utilized for calculating wave runup. The procedure adopted assumes that the waves are not experiencing local breaking, which is a justifiable assumption at most of the buildings at the LMGS site due to wave blocking, diffraction, and scattering by the buildings and as indicated by the SWAN results. The Goda method accommodates obliquely incident waves with wave angle, and it also assumes that

Long Mott Generating Station Preliminary Safety Analysis Report Section 2.4 Hydrology 2.4.5-13 November 2025 the vertical wall causes a reflected or standing wave against the waterside of the wall with the crest of the wave at an elevation greater than one-half of reflected wave height due to wave nonlinearity (the 0.75(1+cos) parameter in *). Because Godas method does not include the hydrostatic contribution of the total force on the wall, this was added to the wave force to produce the total force on the wall. The hydrostatic force (Fh) is defined as Fh = wgh2, where w is the density of seawater, g is gravitational acceleration, and h is the depth of water at the wall.

Wave and hydrostatic pressures are calculated and presented in Figure 2.4.5-27. Hydrostatic pressure at the bottom of the structure is approximately 344 psf and the hydrodynamic pressure at the level of stillwater level is approximately 370 psf.

2.4.5.5 Wave Runup In accordance with EM 1110-2-1614, Equation 2-2 (USACE, 1995; ANSI/ANS, 1992), the design wave height, also referred to herein as H1% (the average wave height of the highest 1 percent of waves), used for wave runup and the calculation of wave effects was calculated using the following approximation, where Hs is significant wave height calculated using SWAN in Subsection 2.4.5.4:.

Wave run-up calculations for the plant are based upon the latest design guidance found in the United States Army Corps of Engineers (USACE) Coastal Engineering ManualCEM, Chapter VI-5 (USACE, 2002). The waves are considered to impact vertical surfaces on the plant's critical surfaces; therefore, the Goda equations are used to determine the wave run-up height (Table VI-5-53, Equation VI-5-147 in USACE, 2002).

Using Godas method, the run-up elevation (*) is * = 0.75 (1+cos) 1 H1%, where is the wave angle from normal to the wall and 1=1 for regular vertical walls. Conservatively cos is set to 1. Therefore, the runup becomes * = 1.5 H1%.

After the calculations are performed, the peak total water surface elevation (WSEL) value, defined as the still WSEL plus wave run-up, is considered the maximum value for the site. Given that the safety-related SSCs are required to be adequately protected, wave run-up will not impact the performance of any required safety functions. Additional site-specific analyses and associated information regarding wave run-up will be provided by the end of 2025.

2.4.5.6 Stillwater Level and Total Water Level due to Storm Surge The maximum PMSS still water level at the LMGS site, before wind-wave induced run-up, is predicted to be at elevation 36.38 ft (11.1 m) NAVD 88.

Adding the combined maximum wave run-up predictions, which is applicable only to the buildings, the maximum PMSS flooding water level at the wall of the buildings of the LMGS site is postulated to be at elevation 46.49 ft (14.17 m) NAVD 88.

References

Long Mott Generating Station Preliminary Safety Analysis Report Section 2.4 Hydrology 2.4.5-14 November 2025 2.4.5-1 ANSI/ANS, 1992. Determining Design Basis Flooding at Power Reactor Sites, ANSI/ANS-2.8-1992, American National Standards Institute/American Nuclear Society, 1992.

2.4.5-2 Blake et al., 20072011. The Deadliest, Costliest, and Most Intense United States Tropical Cyclones from 1851 to 2010 (and Other Frequently Requested Hurricane Facts), NOAA Technical Memorandum NWS NHC-6, National Weather Service, National Hurricane Center, National Oceanic and Atmospheric Administration, August 2011.

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Long Mott Generating Station Preliminary Safety Analysis Report Section 2.4 Hydrology 2.4.5-15 November 2025 2.4.5-130 NOAA, 2024b. Tides and Currents Verified Water Level Data: Rockport, TX Station 8774770, National Oceanic and Atmospheric Administration, Website:

http://tidesandcurrents.noaa.gov/stationhome.html?id=8774770, Date accessed:

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2.4.5-141 NOAA, 2024c. Tides and Currents Verified Water Level Data: Port Lavaca, TX Station 8773259, National Oceanic and Atmospheric Administration, Website:

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Army Corps of Engineers, Washington, D.C. (in 6 volumes), 2002.

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Long Mott Generating Station Preliminary Safety Analysis Report Section 2.4 Hydrology 2.4.5-16 November 2025 2.4.5-2519 Westerink, J.J., C.A. Blain, R.A. Luettich, Jr., and N.W. Scheffner, 1994.

ADCIRC: An Advanced Three-Dimensional Circulation Model for Shelves, Coasts, and Estuaries, Report 2: User's Manual for ADCIRC-2DDI, Dredging Research Program Technical Report DRP-92-6, U.S. Army Engineers Waterways Experiment Station, Vicksburg, MS,1994.

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2.4.5-28 Ajimon, Thomas, J.C. Dietrich, C.N. Dawson, and R.A. Luettich, 2022. Effects of model resolution and coverage on storm-driven coastal flooding predictions, Journal of Waterway, Port, Coastal, and Ocean Engineering 148, 2022.

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Long Mott Generating Station Preliminary Safety Analysis Report Section 2.4 Hydrology 2.4.5-17 November 2025 Table 2.4.5-1 Probable Maximum Hurricane Characteristics Hurricane Parameter Magnitude Peripheral Pressure (Pp) 30.12 in. Hg (1019.9 mb)

Central Pressure (Pc) 26.19 in. Hg (886.9 mb)

Radius of Maximum Winds (Rm) 5 to 21 nautical miles Forward Speed (T) 6 to 20 knotskt Track Direction ()

86 to 191 degrees (clockwise from north)

Maximum 1-min 10-m Wind Speed 154.3 kt Source: NWS, 1979

Long Mott Generating Station Preliminary Safety Analysis Report Section 2.4 Hydrology 2.4.5-18 November 2025 Table 2.4.5-2 Summary of Historical Hurricane Events on the Texas Gulf Coast (Sheet 1 of 2)

Serial Number Date(a)

Hurricane Name(b)

Saffir-Simpson Hurricane Category at Landfall(c)

Central Pressure at Landfall(d)

(millibars)

Maximum Winds(e)

(knots) 1 June 1851 1

977 80 2

June 1854 1

985 70 3

September 1854 Matagorda 2

969 90 4

September 1865 Sabine River-Lake Calcasieu 2

969 90 5

July 1866 2

969 90 6

October 1867 Galveston 2

969 90 7

August 1869 Lower Texas Coast 2

969 90 8

September 1875 3

960 100 9

August 1879 2

964 90 10 August 1880 3

931 110 11 September 1882 2

969 90 12 June 1886 2

973 85 13 August 1886 Indianola 4

925 135 14 September 1886 1

973 80 15 October 1886 3

955 105 16 September 1887 2

973 85 17 June 1888 1

985 70 18 July 1891 1

977 80 19 August 1895 1

973 65 20 September 1897 1

981 75 21 September 1900 Galveston 4

936 125 22 June 19090 2

972 85 23 July 19090 Vealaesco 3

959 100 24 August 19090 1

955 65 25 September 1910 2

965 95 26 October 1912 2

973 85 27 Junely 1913 1

988 65 28 August 1915 Galveston 4

9405 115 29 August 1916 34 948932 115 30 August 1918 3

955 105 3130 September 1919 4

927 130 3231 June 1921 21 979980 80 3332 June 1929 1

982 80 3433 August 1932 Freeport 4

941 3534 July - August 1933 2

975

Long Mott Generating Station Preliminary Safety Analysis Report Section 2.4 Hydrology 2.4.5-19 November 2025 3635 September 1933 3

949 3736 July 1934 2

975

Long Mott Generating Station Preliminary Safety Analysis Report Section 2.4 Hydrology 2.4.5-20 November 2025 Table 2.4.5-2 Summary of Historical Hurricane Events on the Texas Gulf Coast (Sheet 2 of 2)

Serial Number Date(a)

Hurricane Name(b)

Saffir-Simpson Hurricane Category at Landfall(c)

Central Pressure at Landfall(d)

(millibars)

Maximum Winds(e)

(knots) 3837 June 1936 1

987 3938 August 1940 2

972 4039 September 1941 3

958 4140 August 1942 1

992 4241 August 1942 3

950 4342 July 1943 2

969 4443 August 1945 2

967 4544 August 1947 1

992 4645 October 1949 2

972 4746 June 1957 Audrey 4

945 4847 July 1959 Debra 1

984 4948 September 1961 Carla 4

931 5049 September 1963 Cindy 1

996 5150 September 1967 Beulah 3

950 5251 August 1970 Cealia 3

945 5352 September 1971 Fern 1

979 5453 August 1980 Allen 3

945 100 5554 August 1983 Alicia 3

962 100 5655 June 1986 Bonnie 1

990 75 5756 August 1989 Chantal 1

986 70 5857 October 1989 Jerry 1

983 75 5958 August 1999 Bret 3

951 100 6059 July 2003 Claudette 1

979 80 6160 September 2005 Rita 3

937 100 6261 September 2007 Humberto 1

985 80 63 July 2008 Dolly 1

967 75 64 September 2008 Ike 2

950 95 6562 June 2015 Bill 1

997 50 6663 August 2017 Harvey 4

937 115 6764 September 2019 Imelda 1

1003 40 6685 September 2020 Beta 1

997 55 6669 September 20210 Nicholas 1

991 65 a) Some hurricanes made landfall over Mexico but also caused sustained hurricane force surface winds in Texas.

b) Hurricane names are formally maintained from 1957.

c) The highest Saffir-Simpson Hurricane Scale impact in the United States based on estimated maximum sustained surface winds produced at the coast.

d) The observed (or analyzed by NOAA from peripheral pressure measurements) central pressure of the hurricane at landfall.

e) Estimated maximum sustained (1 min.) surface (at 32.8 ft. or 10 m) winds to occur along the U.S. Coast. Winds are

Long Mott Generating Station Preliminary Safety Analysis Report Section 2.4 Hydrology 2.4.5-21 November 2025 estimated to the nearest 10 knots for the period of 1851 to 1885 and to the nearest 5 knots for the period of 1886 to date. Data not available from NOAA for the years 193215 through 1979.

Source: Blake et al., 2007 2011 and NOAA, 2024a.

Long Mott Generating Station Preliminary Safety Analysis Report Section 2.4 Hydrology 2.4.5-22 November 2025 Table 2.4.5-3 Hypothetical Landfall Coordinates Landfall (ID)

Latitude Longitude L1 28.36233 N

-96.3984 W

L2 28.27016 N

-96.56075 W

L3 28.17324 N

-96.70786 W

L4 28.06319 N

-96.85299 W

L5 27.94131 N

-96.97495 W

L6 27.80377 N

-97.07635 W

L7 27.66018 N

-97.17836 W

L8 27.503425 N

-97.260625 W

Long Mott Generating Station Preliminary Safety Analysis Report Table 2.4.5-4 Synthetic Hurricane Parameters (Sheet 1 of 54)

Section 2.4 Hydrology November 2025 Storm ID Bearing

()

Rmax (nm)

T (kt)

Landfall Lat Long P (mb) 1 80 5

5 L1 28.36233

-96.3984 109.17 2

95 5

5 L1 28.36233

-96.3984 109.17 3

110 5

5 L1 28.36233

-96.3984 109.17 4

125 5

5 L1 28.36233

-96.3984 109.17 5

140 5

5 L1 28.36233

-96.3984 109.17 6

155 5

5 L1 28.36233

-96.3984 109.17 7

170 5

5 L1 28.36233

-96.3984 109.17 8

185 5

5 L1 28.36233

-96.3984 109.17 9

200 5

5 L1 28.36233

-96.3984 109.17 10 80 10 5

L1 28.36233

-96.3984 114.31 11 95 10 5

L1 28.36233

-96.3984 114.31 12 110 10 5

L1 28.36233

-96.3984 114.31 13 125 10 5

L1 28.36233

-96.3984 114.31 14 140 10 5

L1 28.36233

-96.3984 114.31 15 155 10 5

L1 28.36233

-96.3984 114.31 16 170 10 5

L1 28.36233

-96.3984 114.31 17 185 10 5

L1 28.36233

-96.3984 114.31 18 200 10 5

L1 28.36233

-96.3984 114.31 19 80 15 5

L1 28.36233

-96.3984 120.26 20 95 15 5

L1 28.36233

-96.3984 120.26 21 110 15 5

L1 28.36233

-96.3984 120.26 22 125 15 5

L1 28.36233

-96.3984 120.26 23 140 15 5

L1 28.36233

-96.3984 120.26 24 155 15 5

L1 28.36233

-96.3984 120.26 25 170 15 5

L1 28.36233

-96.3984 120.26 26 185 15 5

L1 28.36233

-96.3984 120.26 27 200 15 5

L1 28.36233

-96.3984 120.26 2.4.5-23

Long Mott Generating Station Preliminary Safety Analysis Report Table 2.4.5-4 Synthetic Hurricane Parameters (Sheet 2 of 54)

Section 2.4 Hydrology November 2025 Storm ID Bearing

()

Rmax (nm)

T (kt)

Landfall Lat Long P (mb) 28 80 20 5

L1 28.36233

-96.3984 126.8 29 95 20 5

L1 28.36233

-96.3984 126.8 30 110 20 5

L1 28.36233

-96.3984 126.8 31 125 20 5

L1 28.36233

-96.3984 126.8 32 140 20 5

L1 28.36233

-96.3984 126.8 33 155 20 5

L1 28.36233

-96.3984 126.8 34 170 20 5

L1 28.36233

-96.3984 126.8 35 185 20 5

L1 28.36233

-96.3984 126.8 36 200 20 5

L1 28.36233

-96.3984 126.8 37 80 25 5

L1 28.36233

-96.3984 133.1 38 95 25 5

L1 28.36233

-96.3984 133.1 39 110 25 5

L1 28.36233

-96.3984 133.1 40 125 25 5

L1 28.36233

-96.3984 133.1 41 140 25 5

L1 28.36233

-96.3984 133.1 42 155 25 5

L1 28.36233

-96.3984 133.1 43 170 25 5

L1 28.36233

-96.3984 133.1 44 185 25 5

L1 28.36233

-96.3984 133.1 45 200 25 5

L1 28.36233

-96.3984 133.1 46 80 5

10 L1 28.36233

-96.3984 105.42 47 95 5

10 L1 28.36233

-96.3984 105.42 48 110 5

10 L1 28.36233

-96.3984 105.42 49 125 5

10 L1 28.36233

-96.3984 105.42 50 140 5

10 L1 28.36233

-96.3984 105.42 51 155 5

10 L1 28.36233

-96.3984 105.42 52 170 5

10 L1 28.36233

-96.3984 105.42 53 185 5

10 L1 28.36233

-96.3984 105.42 54 200 5

10 L1 28.36233

-96.3984 105.42 2.4.5-24

Long Mott Generating Station Preliminary Safety Analysis Report Table 2.4.5-4 Synthetic Hurricane Parameters (Sheet 3 of 54)

Section 2.4 Hydrology November 2025 Storm ID Bearing

()

Rmax (nm)

T (kt)

Landfall Lat Long P (mb) 55 80 10 10 L1 28.36233

-96.3984 110.4 56 95 10 10 L1 28.36233

-96.3984 110.4 57 110 10 10 L1 28.36233

-96.3984 110.4 58 125 10 10 L1 28.36233

-96.3984 110.4 59 140 10 10 L1 28.36233

-96.3984 110.4 60 155 10 10 L1 28.36233

-96.3984 110.4 61 170 10 10 L1 28.36233

-96.3984 110.4 62 185 10 10 L1 28.36233

-96.3984 110.4 63 200 10 10 L1 28.36233

-96.3984 110.4 64 80 15 10 L1 28.36233

-96.3984 116.3 65 95 15 10 L1 28.36233

-96.3984 116.3 66 110 15 10 L1 28.36233

-96.3984 116.3 67 125 15 10 L1 28.36233

-96.3984 116.3 68 140 15 10 L1 28.36233

-96.3984 116.3 69 155 15 10 L1 28.36233

-96.3984 116.3 70 170 15 10 L1 28.36233

-96.3984 116.3 71 185 15 10 L1 28.36233

-96.3984 116.3 72 200 15 10 L1 28.36233

-96.3984 116.3 73 80 20 10 L1 28.36233

-96.3984 123.14 74 95 20 10 L1 28.36233

-96.3984 123.14 75 110 20 10 L1 28.36233

-96.3984 123.14 76 125 20 10 L1 28.36233

-96.3984 123.14 77 140 20 10 L1 28.36233

-96.3984 123.14 78 155 20 10 L1 28.36233

-96.3984 123.14 79 170 20 10 L1 28.36233

-96.3984 123.14 80 185 20 10 L1 28.36233

-96.3984 123.14 81 200 20 10 L1 28.36233

-96.3984 123.14 2.4.5-25

Long Mott Generating Station Preliminary Safety Analysis Report Table 2.4.5-4 Synthetic Hurricane Parameters (Sheet 4 of 54)

Section 2.4 Hydrology November 2025 Storm ID Bearing

()

Rmax (nm)

T (kt)

Landfall Lat Long P (mb) 82 80 25 10 L1 28.36233

-96.3984 130.42 83 95 25 10 L1 28.36233

-96.3984 130.42 84 110 25 10 L1 28.36233

-96.3984 130.42 85 125 25 10 L1 28.36233

-96.3984 130.42 86 140 25 10 L1 28.36233

-96.3984 130.42 87 155 25 10 L1 28.36233

-96.3984 130.42 88 170 25 10 L1 28.36233

-96.3984 130.42 89 185 25 10 L1 28.36233

-96.3984 130.42 90 200 25 10 L1 28.36233

-96.3984 130.42 91 80 5

15 L1 28.36233

-96.3984 101.74 92 95 5

15 L1 28.36233

-96.3984 101.74 93 110 5

15 L1 28.36233

-96.3984 101.74 94 125 5

15 L1 28.36233

-96.3984 101.74 95 140 5

15 L1 28.36233

-96.3984 101.74 96 155 5

15 L1 28.36233

-96.3984 101.74 97 170 5

15 L1 28.36233

-96.3984 101.74 98 185 5

15 L1 28.36233

-96.3984 101.74 99 200 5

15 L1 28.36233

-96.3984 101.74 100 80 10 15 L1 28.36233

-96.3984 106.64 101 95 10 15 L1 28.36233

-96.3984 106.64 102 110 10 15 L1 28.36233

-96.3984 106.64 103 125 10 15 L1 28.36233

-96.3984 106.64 104 140 10 15 L1 28.36233

-96.3984 106.64 105 155 10 15 L1 28.36233

-96.3984 106.64 106 170 10 15 L1 28.36233

-96.3984 106.64 107 185 10 15 L1 28.36233

-96.3984 106.64 108 200 10 15 L1 28.36233

-96.3984 106.64 2.4.5-26

Long Mott Generating Station Preliminary Safety Analysis Report Table 2.4.5-4 Synthetic Hurricane Parameters (Sheet 5 of 54)

Section 2.4 Hydrology November 2025 Storm ID Bearing

()

Rmax (nm)

T (kt)

Landfall Lat Long P (mb) 109 80 15 15 L1 28.36233

-96.3984 112.59 110 95 15 15 L1 28.36233

-96.3984 112.59 111 110 15 15 L1 28.36233

-96.3984 112.59 112 125 15 15 L1 28.36233

-96.3984 112.59 113 140 15 15 L1 28.36233

-96.3984 112.59 114 155 15 15 L1 28.36233

-96.3984 112.59 115 170 15 15 L1 28.36233

-96.3984 112.59 116 185 15 15 L1 28.36233

-96.3984 112.59 117 200 15 15 L1 28.36233

-96.3984 112.59 118 80 20 15 L1 28.36233

-96.3984 119.42 119 95 20 15 L1 28.36233

-96.3984 119.42 120 110 20 15 L1 28.36233

-96.3984 119.42 121 125 20 15 L1 28.36233

-96.3984 119.42 122 140 20 15 L1 28.36233

-96.3984 119.42 123 155 20 15 L1 28.36233

-96.3984 119.42 124 170 20 15 L1 28.36233

-96.3984 119.42 125 185 20 15 L1 28.36233

-96.3984 119.42 126 200 20 15 L1 28.36233

-96.3984 119.42 127 80 25 15 L1 28.36233

-96.3984 126.8 128 95 25 15 L1 28.36233

-96.3984 126.8 129 110 25 15 L1 28.36233

-96.3984 126.8 130 125 25 15 L1 28.36233

-96.3984 126.8 131 140 25 15 L1 28.36233

-96.3984 126.8 132 155 25 15 L1 28.36233

-96.3984 126.8 133 170 25 15 L1 28.36233

-96.3984 126.8 134 185 25 15 L1 28.36233

-96.3984 126.8 135 200 25 15 L1 28.36233

-96.3984 126.8 2.4.5-27

Long Mott Generating Station Preliminary Safety Analysis Report Table 2.4.5-4 Synthetic Hurricane Parameters (Sheet 6 of 54)

Section 2.4 Hydrology November 2025 Storm ID Bearing

()

Rmax (nm)

T (kt)

Landfall Lat Long P (mb) 136 80 5

20 L1 28.36233

-96.3984 100 137 95 5

20 L1 28.36233

-96.3984 100 138 110 5

20 L1 28.36233

-96.3984 100 139 125 5

20 L1 28.36233

-96.3984 100 140 140 5

20 L1 28.36233

-96.3984 100 141 155 5

20 L1 28.36233

-96.3984 100 142 170 5

20 L1 28.36233

-96.3984 100 143 185 5

20 L1 28.36233

-96.3984 100 144 200 5

20 L1 28.36233

-96.3984 100 145 80 10 20 L1 28.36233

-96.3984 103.07 146 95 10 20 L1 28.36233

-96.3984 103.07 147 110 10 20 L1 28.36233

-96.3984 103.07 148 125 10 20 L1 28.36233

-96.3984 103.07 149 140 10 20 L1 28.36233

-96.3984 103.07 150 155 10 20 L1 28.36233

-96.3984 103.07 151 170 10 20 L1 28.36233

-96.3984 103.07 152 185 10 20 L1 28.36233

-96.3984 103.07 153 200 10 20 L1 28.36233

-96.3984 103.07 154 80 15 20 L1 28.36233

-96.3984 108.87 155 95 15 20 L1 28.36233

-96.3984 108.87 156 110 15 20 L1 28.36233

-96.3984 108.87 157 125 15 20 L1 28.36233

-96.3984 108.87 158 140 15 20 L1 28.36233

-96.3984 108.87 159 155 15 20 L1 28.36233

-96.3984 108.87 160 170 15 20 L1 28.36233

-96.3984 108.87 161 185 15 20 L1 28.36233

-96.3984 108.87 162 200 15 20 L1 28.36233

-96.3984 108.87 2.4.5-28

Long Mott Generating Station Preliminary Safety Analysis Report Table 2.4.5-4 Synthetic Hurricane Parameters (Sheet 7 of 54)

Section 2.4 Hydrology November 2025 Storm ID Bearing

()

Rmax (nm)

T (kt)

Landfall Lat Long P (mb) 163 80 20 20 L1 28.36233

-96.3984 115.71 164 95 20 20 L1 28.36233

-96.3984 115.71 165 110 20 20 L1 28.36233

-96.3984 115.71 166 125 20 20 L1 28.36233

-96.3984 115.71 167 140 20 20 L1 28.36233

-96.3984 115.71 168 155 20 20 L1 28.36233

-96.3984 115.71 169 170 20 20 L1 28.36233

-96.3984 115.71 170 185 20 20 L1 28.36233

-96.3984 115.71 171 200 20 20 L1 28.36233

-96.3984 115.71 172 80 25 20 L1 28.36233

-96.3984 123.14 173 95 25 20 L1 28.36233

-96.3984 123.14 174 110 25 20 L1 28.36233

-96.3984 123.14 175 125 25 20 L1 28.36233

-96.3984 123.14 176 140 25 20 L1 28.36233

-96.3984 123.14 177 155 25 20 L1 28.36233

-96.3984 123.14 178 170 25 20 L1 28.36233

-96.3984 123.14 179 185 25 20 L1 28.36233

-96.3984 123.14 180 200 25 20 L1 28.36233

-96.3984 123.14 181 80 5

5 L2 28.27016

-96.56075 109.17 182 95 5

5 L2 28.27016

-96.56075 109.17 183 110 5

5 L2 28.27016

-96.56075 109.17 184 125 5

5 L2 28.27016

-96.56075 109.17 185 140 5

5 L2 28.27016

-96.56075 109.17 186 155 5

5 L2 28.27016

-96.56075 109.17 187 170 5

5 L2 28.27016

-96.56075 109.17 188 185 5

5 L2 28.27016

-96.56075 109.17 189 200 5

5 L2 28.27016

-96.56075 109.17 2.4.5-29

Long Mott Generating Station Preliminary Safety Analysis Report Table 2.4.5-4 Synthetic Hurricane Parameters (Sheet 8 of 54)

Section 2.4 Hydrology November 2025 Storm ID Bearing

()

Rmax (nm)

T (kt)

Landfall Lat Long P (mb) 190 80 10 5

L2 28.27016

-96.56075 114.31 191 95 10 5

L2 28.27016

-96.56075 114.31 192 110 10 5

L2 28.27016

-96.56075 114.31 193 125 10 5

L2 28.27016

-96.56075 114.31 194 140 10 5

L2 28.27016

-96.56075 114.31 195 155 10 5

L2 28.27016

-96.56075 114.31 196 170 10 5

L2 28.27016

-96.56075 114.31 197 185 10 5

L2 28.27016

-96.56075 114.31 198 200 10 5

L2 28.27016

-96.56075 114.31 199 80 15 5

L2 28.27016

-96.56075 120.26 200 95 15 5

L2 28.27016

-96.56075 120.26 201 110 15 5

L2 28.27016

-96.56075 120.26 202 125 15 5

L2 28.27016

-96.56075 120.26 203 140 15 5

L2 28.27016

-96.56075 120.26 204 155 15 5

L2 28.27016

-96.56075 120.26 205 170 15 5

L2 28.27016

-96.56075 120.26 206 185 15 5

L2 28.27016

-96.56075 120.26 207 200 15 5

L2 28.27016

-96.56075 120.26 208 80 20 5

L2 28.27016

-96.56075 126.8 209 95 20 5

L2 28.27016

-96.56075 126.8 210 110 20 5

L2 28.27016

-96.56075 126.8 211 125 20 5

L2 28.27016

-96.56075 126.8 212 140 20 5

L2 28.27016

-96.56075 126.8 213 155 20 5

L2 28.27016

-96.56075 126.8 214 170 20 5

L2 28.27016

-96.56075 126.8 215 185 20 5

L2 28.27016

-96.56075 126.8 216 200 20 5

L2 28.27016

-96.56075 126.8 2.4.5-30

Long Mott Generating Station Preliminary Safety Analysis Report Table 2.4.5-4 Synthetic Hurricane Parameters (Sheet 9 of 54)

Section 2.4 Hydrology November 2025 Storm ID Bearing

()

Rmax (nm)

T (kt)

Landfall Lat Long P (mb) 217 80 25 5

L2 28.27016

-96.56075 133.1 218 95 25 5

L2 28.27016

-96.56075 133.1 219 110 25 5

L2 28.27016

-96.56075 133.1 220 125 25 5

L2 28.27016

-96.56075 133.1 221 140 25 5

L2 28.27016

-96.56075 133.1 222 155 25 5

L2 28.27016

-96.56075 133.1 223 170 25 5

L2 28.27016

-96.56075 133.1 224 185 25 5

L2 28.27016

-96.56075 133.1 225 200 25 5

L2 28.27016

-96.56075 133.1 226 80 5

10 L2 28.27016

-96.56075 105.42 227 95 5

10 L2 28.27016

-96.56075 105.42 228 110 5

10 L2 28.27016

-96.56075 105.42 229 125 5

10 L2 28.27016

-96.56075 105.42 230 140 5

10 L2 28.27016

-96.56075 105.42 231 155 5

10 L2 28.27016

-96.56075 105.42 232 170 5

10 L2 28.27016

-96.56075 105.42 233 185 5

10 L2 28.27016

-96.56075 105.42 234 200 5

10 L2 28.27016

-96.56075 105.42 235 80 10 10 L2 28.27016

-96.56075 110.4 236 95 10 10 L2 28.27016

-96.56075 110.4 237 110 10 10 L2 28.27016

-96.56075 110.4 238 125 10 10 L2 28.27016

-96.56075 110.4 239 140 10 10 L2 28.27016

-96.56075 110.4 240 155 10 10 L2 28.27016

-96.56075 110.4 241 170 10 10 L2 28.27016

-96.56075 110.4 242 185 10 10 L2 28.27016

-96.56075 110.4 243 200 10 10 L2 28.27016

-96.56075 110.4 2.4.5-31

Long Mott Generating Station Preliminary Safety Analysis Report Table 2.4.5-4 Synthetic Hurricane Parameters (Sheet 10 of 54)

Section 2.4 Hydrology November 2025 Storm ID Bearing

()

Rmax (nm)

T (kt)

Landfall Lat Long P (mb) 244 80 15 10 L2 28.27016

-96.56075 116.3 245 95 15 10 L2 28.27016

-96.56075 116.3 246 110 15 10 L2 28.27016

-96.56075 116.3 247 125 15 10 L2 28.27016

-96.56075 116.3 248 140 15 10 L2 28.27016

-96.56075 116.3 249 155 15 10 L2 28.27016

-96.56075 116.3 250 170 15 10 L2 28.27016

-96.56075 116.3 251 185 15 10 L2 28.27016

-96.56075 116.3 252 200 15 10 L2 28.27016

-96.56075 116.3 253 80 20 10 L2 28.27016

-96.56075 123.14 254 95 20 10 L2 28.27016

-96.56075 123.14 255 110 20 10 L2 28.27016

-96.56075 123.14 256 125 20 10 L2 28.27016

-96.56075 123.14 257 140 20 10 L2 28.27016

-96.56075 123.14 258 155 20 10 L2 28.27016

-96.56075 123.14 259 170 20 10 L2 28.27016

-96.56075 123.14 260 185 20 10 L2 28.27016

-96.56075 123.14 261 200 20 10 L2 28.27016

-96.56075 123.14 262 80 25 10 L2 28.27016

-96.56075 130.42 263 95 25 10 L2 28.27016

-96.56075 130.42 264 110 25 10 L2 28.27016

-96.56075 130.42 265 125 25 10 L2 28.27016

-96.56075 130.42 266 140 25 10 L2 28.27016

-96.56075 130.42 267 155 25 10 L2 28.27016

-96.56075 130.42 268 170 25 10 L2 28.27016

-96.56075 130.42 269 185 25 10 L2 28.27016

-96.56075 130.42 270 200 25 10 L2 28.27016

-96.56075 130.42 2.4.5-32

Long Mott Generating Station Preliminary Safety Analysis Report Table 2.4.5-4 Synthetic Hurricane Parameters (Sheet 11 of 54)

Section 2.4 Hydrology November 2025 Storm ID Bearing

()

Rmax (nm)

T (kt)

Landfall Lat Long P (mb) 271 80 5

15 L2 28.27016

-96.56075 101.74 272 95 5

15 L2 28.27016

-96.56075 101.74 273 110 5

15 L2 28.27016

-96.56075 101.74 274 125 5

15 L2 28.27016

-96.56075 101.74 275 140 5

15 L2 28.27016

-96.56075 101.74 276 155 5

15 L2 28.27016

-96.56075 101.74 277 170 5

15 L2 28.27016

-96.56075 101.74 278 185 5

15 L2 28.27016

-96.56075 101.74 279 200 5

15 L2 28.27016

-96.56075 101.74 280 80 10 15 L2 28.27016

-96.56075 106.64 281 95 10 15 L2 28.27016

-96.56075 106.64 282 110 10 15 L2 28.27016

-96.56075 106.64 283 125 10 15 L2 28.27016

-96.56075 106.64 284 140 10 15 L2 28.27016

-96.56075 106.64 285 155 10 15 L2 28.27016

-96.56075 106.64 286 170 10 15 L2 28.27016

-96.56075 106.64 287 185 10 15 L2 28.27016

-96.56075 106.64 288 200 10 15 L2 28.27016

-96.56075 106.64 289 80 15 15 L2 28.27016

-96.56075 112.59 290 95 15 15 L2 28.27016

-96.56075 112.59 291 110 15 15 L2 28.27016

-96.56075 112.59 292 125 15 15 L2 28.27016

-96.56075 112.59 293 140 15 15 L2 28.27016

-96.56075 112.59 294 155 15 15 L2 28.27016

-96.56075 112.59 295 170 15 15 L2 28.27016

-96.56075 112.59 296 185 15 15 L2 28.27016

-96.56075 112.59 297 200 15 15 L2 28.27016

-96.56075 112.59 2.4.5-33

Long Mott Generating Station Preliminary Safety Analysis Report Table 2.4.5-4 Synthetic Hurricane Parameters (Sheet 12 of 54)

Section 2.4 Hydrology November 2025 Storm ID Bearing

()

Rmax (nm)

T (kt)

Landfall Lat Long P (mb) 298 80 20 15 L2 28.27016

-96.56075 119.42 299 95 20 15 L2 28.27016

-96.56075 119.42 300 110 20 15 L2 28.27016

-96.56075 119.42 301 125 20 15 L2 28.27016

-96.56075 119.42 302 140 20 15 L2 28.27016

-96.56075 119.42 303 155 20 15 L2 28.27016

-96.56075 119.42 304 170 20 15 L2 28.27016

-96.56075 119.42 305 185 20 15 L2 28.27016

-96.56075 119.42 306 200 20 15 L2 28.27016

-96.56075 119.42 307 80 25 15 L2 28.27016

-96.56075 126.8 308 95 25 15 L2 28.27016

-96.56075 126.8 309 110 25 15 L2 28.27016

-96.56075 126.8 310 125 25 15 L2 28.27016

-96.56075 126.8 311 140 25 15 L2 28.27016

-96.56075 126.8 312 155 25 15 L2 28.27016

-96.56075 126.8 313 170 25 15 L2 28.27016

-96.56075 126.8 314 185 25 15 L2 28.27016

-96.56075 126.8 315 200 25 15 L2 28.27016

-96.56075 126.8 316 80 5

20 L2 28.27016

-96.56075 100 317 95 5

20 L2 28.27016

-96.56075 100 318 110 5

20 L2 28.27016

-96.56075 100 319 125 5

20 L2 28.27016

-96.56075 100 320 140 5

20 L2 28.27016

-96.56075 100 321 155 5

20 L2 28.27016

-96.56075 100 322 170 5

20 L2 28.27016

-96.56075 100 323 185 5

20 L2 28.27016

-96.56075 100 324 200 5

20 L2 28.27016

-96.56075 100 2.4.5-34

Long Mott Generating Station Preliminary Safety Analysis Report Table 2.4.5-4 Synthetic Hurricane Parameters (Sheet 13 of 54)

Section 2.4 Hydrology November 2025 Storm ID Bearing

()

Rmax (nm)

T (kt)

Landfall Lat Long P (mb) 325 80 10 20 L2 28.27016

-96.56075 103.07 326 95 10 20 L2 28.27016

-96.56075 103.07 327 110 10 20 L2 28.27016

-96.56075 103.07 328 125 10 20 L2 28.27016

-96.56075 103.07 329 140 10 20 L2 28.27016

-96.56075 103.07 330 155 10 20 L2 28.27016

-96.56075 103.07 331 170 10 20 L2 28.27016

-96.56075 103.07 332 185 10 20 L2 28.27016

-96.56075 103.07 333 200 10 20 L2 28.27016

-96.56075 103.07 334 80 15 20 L2 28.27016

-96.56075 108.87 335 95 15 20 L2 28.27016

-96.56075 108.87 336 110 15 20 L2 28.27016

-96.56075 108.87 337 125 15 20 L2 28.27016

-96.56075 108.87 338 140 15 20 L2 28.27016

-96.56075 108.87 339 155 15 20 L2 28.27016

-96.56075 108.87 340 170 15 20 L2 28.27016

-96.56075 108.87 341 185 15 20 L2 28.27016

-96.56075 108.87 342 200 15 20 L2 28.27016

-96.56075 108.87 343 80 20 20 L2 28.27016

-96.56075 115.71 344 95 20 20 L2 28.27016

-96.56075 115.71 345 110 20 20 L2 28.27016

-96.56075 115.71 346 125 20 20 L2 28.27016

-96.56075 115.71 347 140 20 20 L2 28.27016

-96.56075 115.71 348 155 20 20 L2 28.27016

-96.56075 115.71 349 170 20 20 L2 28.27016

-96.56075 115.71 350 185 20 20 L2 28.27016

-96.56075 115.71 351 200 20 20 L2 28.27016

-96.56075 115.71 2.4.5-35

Long Mott Generating Station Preliminary Safety Analysis Report Table 2.4.5-4 Synthetic Hurricane Parameters (Sheet 14 of 54)

Section 2.4 Hydrology November 2025 Storm ID Bearing

()

Rmax (nm)

T (kt)

Landfall Lat Long P (mb) 352 80 25 20 L2 28.27016

-96.56075 123.14 353 95 25 20 L2 28.27016

-96.56075 123.14 354 110 25 20 L2 28.27016

-96.56075 123.14 355 125 25 20 L2 28.27016

-96.56075 123.14 356 140 25 20 L2 28.27016

-96.56075 123.14 357 155 25 20 L2 28.27016

-96.56075 123.14 358 170 25 20 L2 28.27016

-96.56075 123.14 359 185 25 20 L2 28.27016

-96.56075 123.14 360 200 25 20 L2 28.27016

-96.56075 123.14 361 80 5

5 L3 28.17324

-96.70786 109.17 362 95 5

5 L3 28.17324

-96.70786 109.17 363 110 5

5 L3 28.17324

-96.70786 109.17 364 125 5

5 L3 28.17324

-96.70786 109.17 365 140 5

5 L3 28.17324

-96.70786 109.17 366 155 5

5 L3 28.17324

-96.70786 109.17 367 170 5

5 L3 28.17324

-96.70786 109.17 368 185 5

5 L3 28.17324

-96.70786 109.17 369 200 5

5 L3 28.17324

-96.70786 109.17 370 80 10 5

L3 28.17324

-96.70786 114.31 371 95 10 5

L3 28.17324

-96.70786 114.31 372 110 10 5

L3 28.17324

-96.70786 114.31 373 125 10 5

L3 28.17324

-96.70786 114.31 374 140 10 5

L3 28.17324

-96.70786 114.31 375 155 10 5

L3 28.17324

-96.70786 114.31 376 170 10 5

L3 28.17324

-96.70786 114.31 377 185 10 5

L3 28.17324

-96.70786 114.31 378 200 10 5

L3 28.17324

-96.70786 114.31 2.4.5-36

Long Mott Generating Station Preliminary Safety Analysis Report Table 2.4.5-4 Synthetic Hurricane Parameters (Sheet 15 of 54)

Section 2.4 Hydrology November 2025 Storm ID Bearing

()

Rmax (nm)

T (kt)

Landfall Lat Long P (mb) 379 80 15 5

L3 28.17324

-96.70786 120.26 380 95 15 5

L3 28.17324

-96.70786 120.26 381 110 15 5

L3 28.17324

-96.70786 120.26 382 125 15 5

L3 28.17324

-96.70786 120.26 383 140 15 5

L3 28.17324

-96.70786 120.26 384 155 15 5

L3 28.17324

-96.70786 120.26 385 170 15 5

L3 28.17324

-96.70786 120.26 386 185 15 5

L3 28.17324

-96.70786 120.26 387 200 15 5

L3 28.17324

-96.70786 120.26 388 80 20 5

L3 28.17324

-96.70786 126.8 389 95 20 5

L3 28.17324

-96.70786 126.8 390 110 20 5

L3 28.17324

-96.70786 126.8 391 125 20 5

L3 28.17324

-96.70786 126.8 392 140 20 5

L3 28.17324

-96.70786 126.8 393 155 20 5

L3 28.17324

-96.70786 126.8 394 170 20 5

L3 28.17324

-96.70786 126.8 395 185 20 5

L3 28.17324

-96.70786 126.8 396 200 20 5

L3 28.17324

-96.70786 126.8 397 80 25 5

L3 28.17324

-96.70786 133.1 398 95 25 5

L3 28.17324

-96.70786 133.1 399 110 25 5

L3 28.17324

-96.70786 133.1 400 125 25 5

L3 28.17324

-96.70786 133.1 401 140 25 5

L3 28.17324

-96.70786 133.1 402 155 25 5

L3 28.17324

-96.70786 133.1 403 170 25 5

L3 28.17324

-96.70786 133.1 404 185 25 5

L3 28.17324

-96.70786 133.1 405 200 25 5

L3 28.17324

-96.70786 133.1 2.4.5-37

Long Mott Generating Station Preliminary Safety Analysis Report Table 2.4.5-4 Synthetic Hurricane Parameters (Sheet 16 of 54)

Section 2.4 Hydrology November 2025 Storm ID Bearing

()

Rmax (nm)

T (kt)

Landfall Lat Long P (mb) 406 80 5

10 L3 28.17324

-96.70786 105.42 407 95 5

10 L3 28.17324

-96.70786 105.42 408 110 5

10 L3 28.17324

-96.70786 105.42 409 125 5

10 L3 28.17324

-96.70786 105.42 410 140 5

10 L3 28.17324

-96.70786 105.42 411 155 5

10 L3 28.17324

-96.70786 105.42 412 170 5

10 L3 28.17324

-96.70786 105.42 413 185 5

10 L3 28.17324

-96.70786 105.42 414 200 5

10 L3 28.17324

-96.70786 105.42 415 80 10 10 L3 28.17324

-96.70786 110.4 416 95 10 10 L3 28.17324

-96.70786 110.4 417 110 10 10 L3 28.17324

-96.70786 110.4 418 125 10 10 L3 28.17324

-96.70786 110.4 419 140 10 10 L3 28.17324

-96.70786 110.4 420 155 10 10 L3 28.17324

-96.70786 110.4 421 170 10 10 L3 28.17324

-96.70786 110.4 422 185 10 10 L3 28.17324

-96.70786 110.4 423 200 10 10 L3 28.17324

-96.70786 110.4 424 80 15 10 L3 28.17324

-96.70786 116.3 425 95 15 10 L3 28.17324

-96.70786 116.3 426 110 15 10 L3 28.17324

-96.70786 116.3 427 125 15 10 L3 28.17324

-96.70786 116.3 428 140 15 10 L3 28.17324

-96.70786 116.3 429 155 15 10 L3 28.17324

-96.70786 116.3 430 170 15 10 L3 28.17324

-96.70786 116.3 431 185 15 10 L3 28.17324

-96.70786 116.3 432 200 15 10 L3 28.17324

-96.70786 116.3 2.4.5-38

Long Mott Generating Station Preliminary Safety Analysis Report Table 2.4.5-4 Synthetic Hurricane Parameters (Sheet 17 of 54)

Section 2.4 Hydrology November 2025 Storm ID Bearing

()

Rmax (nm)

T (kt)

Landfall Lat Long P (mb) 433 80 20 10 L3 28.17324

-96.70786 123.14 434 95 20 10 L3 28.17324

-96.70786 123.14 435 110 20 10 L3 28.17324

-96.70786 123.14 436 125 20 10 L3 28.17324

-96.70786 123.14 437 140 20 10 L3 28.17324

-96.70786 123.14 438 155 20 10 L3 28.17324

-96.70786 123.14 439 170 20 10 L3 28.17324

-96.70786 123.14 440 185 20 10 L3 28.17324

-96.70786 123.14 441 200 20 10 L3 28.17324

-96.70786 123.14 442 80 25 10 L3 28.17324

-96.70786 130.42 443 95 25 10 L3 28.17324

-96.70786 130.42 444 110 25 10 L3 28.17324

-96.70786 130.42 445 125 25 10 L3 28.17324

-96.70786 130.42 446 140 25 10 L3 28.17324

-96.70786 130.42 447 155 25 10 L3 28.17324

-96.70786 130.42 448 170 25 10 L3 28.17324

-96.70786 130.42 449 185 25 10 L3 28.17324

-96.70786 130.42 450 200 25 10 L3 28.17324

-96.70786 130.42 451 80 5

15 L3 28.17324

-96.70786 101.74 452 95 5

15 L3 28.17324

-96.70786 101.74 453 110 5

15 L3 28.17324

-96.70786 101.74 454 125 5

15 L3 28.17324

-96.70786 101.74 455 140 5

15 L3 28.17324

-96.70786 101.74 456 155 5

15 L3 28.17324

-96.70786 101.74 457 170 5

15 L3 28.17324

-96.70786 101.74 458 185 5

15 L3 28.17324

-96.70786 101.74 459 200 5

15 L3 28.17324

-96.70786 101.74 2.4.5-39

Long Mott Generating Station Preliminary Safety Analysis Report Table 2.4.5-4 Synthetic Hurricane Parameters (Sheet 18 of 54)

Section 2.4 Hydrology November 2025 Storm ID Bearing

()

Rmax (nm)

T (kt)

Landfall Lat Long P (mb) 460 80 10 15 L3 28.17324

-96.70786 106.64 461 95 10 15 L3 28.17324

-96.70786 106.64 462 110 10 15 L3 28.17324

-96.70786 106.64 463 125 10 15 L3 28.17324

-96.70786 106.64 464 140 10 15 L3 28.17324

-96.70786 106.64 465 155 10 15 L3 28.17324

-96.70786 106.64 466 170 10 15 L3 28.17324

-96.70786 106.64 467 185 10 15 L3 28.17324

-96.70786 106.64 468 200 10 15 L3 28.17324

-96.70786 106.64 469 80 15 15 L3 28.17324

-96.70786 112.59 470 95 15 15 L3 28.17324

-96.70786 112.59 471 110 15 15 L3 28.17324

-96.70786 112.59 472 125 15 15 L3 28.17324

-96.70786 112.59 473 140 15 15 L3 28.17324

-96.70786 112.59 474 155 15 15 L3 28.17324

-96.70786 112.59 475 170 15 15 L3 28.17324

-96.70786 112.59 476 185 15 15 L3 28.17324

-96.70786 112.59 477 200 15 15 L3 28.17324

-96.70786 112.59 478 80 20 15 L3 28.17324

-96.70786 119.42 479 95 20 15 L3 28.17324

-96.70786 119.42 480 110 20 15 L3 28.17324

-96.70786 119.42 481 125 20 15 L3 28.17324

-96.70786 119.42 482 140 20 15 L3 28.17324

-96.70786 119.42 483 155 20 15 L3 28.17324

-96.70786 119.42 484 170 20 15 L3 28.17324

-96.70786 119.42 485 185 20 15 L3 28.17324

-96.70786 119.42 486 200 20 15 L3 28.17324

-96.70786 119.42 2.4.5-40

Long Mott Generating Station Preliminary Safety Analysis Report Table 2.4.5-4 Synthetic Hurricane Parameters (Sheet 19 of 54)

Section 2.4 Hydrology November 2025 Storm ID Bearing

()

Rmax (nm)

T (kt)

Landfall Lat Long P (mb) 487 80 25 15 L3 28.17324

-96.70786 126.8 488 95 25 15 L3 28.17324

-96.70786 126.8 489 110 25 15 L3 28.17324

-96.70786 126.8 490 125 25 15 L3 28.17324

-96.70786 126.8 491 140 25 15 L3 28.17324

-96.70786 126.8 492 155 25 15 L3 28.17324

-96.70786 126.8 493 170 25 15 L3 28.17324

-96.70786 126.8 494 185 25 15 L3 28.17324

-96.70786 126.8 495 200 25 15 L3 28.17324

-96.70786 126.8 496 80 5

20 L3 28.17324

-96.70786 100 497 95 5

20 L3 28.17324

-96.70786 100 498 110 5

20 L3 28.17324

-96.70786 100 499 125 5

20 L3 28.17324

-96.70786 100 500 140 5

20 L3 28.17324

-96.70786 100 501 155 5

20 L3 28.17324

-96.70786 100 502 170 5

20 L3 28.17324

-96.70786 100 503 185 5

20 L3 28.17324

-96.70786 100 504 200 5

20 L3 28.17324

-96.70786 100 505 80 10 20 L3 28.17324

-96.70786 103.07 506 95 10 20 L3 28.17324

-96.70786 103.07 507 110 10 20 L3 28.17324

-96.70786 103.07 508 125 10 20 L3 28.17324

-96.70786 103.07 509 140 10 20 L3 28.17324

-96.70786 103.07 510 155 10 20 L3 28.17324

-96.70786 103.07 511 170 10 20 L3 28.17324

-96.70786 103.07 512 185 10 20 L3 28.17324

-96.70786 103.07 513 200 10 20 L3 28.17324

-96.70786 103.07 2.4.5-41

Long Mott Generating Station Preliminary Safety Analysis Report Table 2.4.5-4 Synthetic Hurricane Parameters (Sheet 20 of 54)

Section 2.4 Hydrology November 2025 Storm ID Bearing

()

Rmax (nm)

T (kt)

Landfall Lat Long P (mb) 514 80 15 20 L3 28.17324

-96.70786 108.87 515 95 15 20 L3 28.17324

-96.70786 108.87 516 110 15 20 L3 28.17324

-96.70786 108.87 517 125 15 20 L3 28.17324

-96.70786 108.87 518 140 15 20 L3 28.17324

-96.70786 108.87 519 155 15 20 L3 28.17324

-96.70786 108.87 520 170 15 20 L3 28.17324

-96.70786 108.87 521 185 15 20 L3 28.17324

-96.70786 108.87 522 200 15 20 L3 28.17324

-96.70786 108.87 523 80 20 20 L3 28.17324

-96.70786 115.71 524 95 20 20 L3 28.17324

-96.70786 115.71 525 110 20 20 L3 28.17324

-96.70786 115.71 526 125 20 20 L3 28.17324

-96.70786 115.71 527 140 20 20 L3 28.17324

-96.70786 115.71 528 155 20 20 L3 28.17324

-96.70786 115.71 529 170 20 20 L3 28.17324

-96.70786 115.71 530 185 20 20 L3 28.17324

-96.70786 115.71 531 200 20 20 L3 28.17324

-96.70786 115.71 532 80 25 20 L3 28.17324

-96.70786 123.14 533 95 25 20 L3 28.17324

-96.70786 123.14 534 110 25 20 L3 28.17324

-96.70786 123.14 535 125 25 20 L3 28.17324

-96.70786 123.14 536 140 25 20 L3 28.17324

-96.70786 123.14 537 155 25 20 L3 28.17324

-96.70786 123.14 538 170 25 20 L3 28.17324

-96.70786 123.14 539 185 25 20 L3 28.17324

-96.70786 123.14 540 200 25 20 L3 28.17324

-96.70786 123.14 2.4.5-42

Long Mott Generating Station Preliminary Safety Analysis Report Table 2.4.5-4 Synthetic Hurricane Parameters (Sheet 21 of 54)

Section 2.4 Hydrology November 2025 Storm ID Bearing

()

Rmax (nm)

T (kt)

Landfall Lat Long P (mb) 541 80 5

5 L4 28.06319

-96.85299 109.17 542 95 5

5 L4 28.06319

-96.85299 109.17 543 110 5

5 L4 28.06319

-96.85299 109.17 544 125 5

5 L4 28.06319

-96.85299 109.17 545 140 5

5 L4 28.06319

-96.85299 109.17 546 155 5

5 L4 28.06319

-96.85299 109.17 547 170 5

5 L4 28.06319

-96.85299 109.17 548 185 5

5 L4 28.06319

-96.85299 109.17 549 200 5

5 L4 28.06319

-96.85299 109.17 550 80 10 5

L4 28.06319

-96.85299 114.31 551 95 10 5

L4 28.06319

-96.85299 114.31 552 110 10 5

L4 28.06319

-96.85299 114.31 553 125 10 5

L4 28.06319

-96.85299 114.31 554 140 10 5

L4 28.06319

-96.85299 114.31 555 155 10 5

L4 28.06319

-96.85299 114.31 556 170 10 5

L4 28.06319

-96.85299 114.31 557 185 10 5

L4 28.06319

-96.85299 114.31 558 200 10 5

L4 28.06319

-96.85299 114.31 559 80 15 5

L4 28.06319

-96.85299 120.26 560 95 15 5

L4 28.06319

-96.85299 120.26 561 110 15 5

L4 28.06319

-96.85299 120.26 562 125 15 5

L4 28.06319

-96.85299 120.26 563 140 15 5

L4 28.06319

-96.85299 120.26 564 155 15 5

L4 28.06319

-96.85299 120.26 565 170 15 5

L4 28.06319

-96.85299 120.26 566 185 15 5

L4 28.06319

-96.85299 120.26 567 200 15 5

L4 28.06319

-96.85299 120.26 2.4.5-43

Long Mott Generating Station Preliminary Safety Analysis Report Table 2.4.5-4 Synthetic Hurricane Parameters (Sheet 22 of 54)

Section 2.4 Hydrology November 2025 Storm ID Bearing

()

Rmax (nm)

T (kt)

Landfall Lat Long P (mb) 568 80 20 5

L4 28.06319

-96.85299 126.8 569 95 20 5

L4 28.06319

-96.85299 126.8 570 110 20 5

L4 28.06319

-96.85299 126.8 571 125 20 5

L4 28.06319

-96.85299 126.8 572 140 20 5

L4 28.06319

-96.85299 126.8 573 155 20 5

L4 28.06319

-96.85299 126.8 574 170 20 5

L4 28.06319

-96.85299 126.8 575 185 20 5

L4 28.06319

-96.85299 126.8 576 200 20 5

L4 28.06319

-96.85299 126.8 577 80 25 5

L4 28.06319

-96.85299 133.1 578 95 25 5

L4 28.06319

-96.85299 133.1 579 110 25 5

L4 28.06319

-96.85299 133.1 580 125 25 5

L4 28.06319

-96.85299 133.1 581 140 25 5

L4 28.06319

-96.85299 133.1 582 155 25 5

L4 28.06319

-96.85299 133.1 583 170 25 5

L4 28.06319

-96.85299 133.1 584 185 25 5

L4 28.06319

-96.85299 133.1 585 200 25 5

L4 28.06319

-96.85299 133.1 586 80 5

10 L4 28.06319

-96.85299 105.42 587 95 5

10 L4 28.06319

-96.85299 105.42 588 110 5

10 L4 28.06319

-96.85299 105.42 589 125 5

10 L4 28.06319

-96.85299 105.42 590 140 5

10 L4 28.06319

-96.85299 105.42 591 155 5

10 L4 28.06319

-96.85299 105.42 592 170 5

10 L4 28.06319

-96.85299 105.42 593 185 5

10 L4 28.06319

-96.85299 105.42 594 200 5

10 L4 28.06319

-96.85299 105.42 2.4.5-44

Long Mott Generating Station Preliminary Safety Analysis Report Table 2.4.5-4 Synthetic Hurricane Parameters (Sheet 23 of 54)

Section 2.4 Hydrology November 2025 Storm ID Bearing

()

Rmax (nm)

T (kt)

Landfall Lat Long P (mb) 595 80 10 10 L4 28.06319

-96.85299 110.4 596 95 10 10 L4 28.06319

-96.85299 110.4 597 110 10 10 L4 28.06319

-96.85299 110.4 598 125 10 10 L4 28.06319

-96.85299 110.4 599 140 10 10 L4 28.06319

-96.85299 110.4 600 155 10 10 L4 28.06319

-96.85299 110.4 601 170 10 10 L4 28.06319

-96.85299 110.4 602 185 10 10 L4 28.06319

-96.85299 110.4 603 200 10 10 L4 28.06319

-96.85299 110.4 604 80 15 10 L4 28.06319

-96.85299 116.3 605 95 15 10 L4 28.06319

-96.85299 116.3 606 110 15 10 L4 28.06319

-96.85299 116.3 607 125 15 10 L4 28.06319

-96.85299 116.3 608 140 15 10 L4 28.06319

-96.85299 116.3 609 155 15 10 L4 28.06319

-96.85299 116.3 610 170 15 10 L4 28.06319

-96.85299 116.3 611 185 15 10 L4 28.06319

-96.85299 116.3 612 200 15 10 L4 28.06319

-96.85299 116.3 613 80 20 10 L4 28.06319

-96.85299 123.14 614 95 20 10 L4 28.06319

-96.85299 123.14 615 110 20 10 L4 28.06319

-96.85299 123.14 616 125 20 10 L4 28.06319

-96.85299 123.14 617 140 20 10 L4 28.06319

-96.85299 123.14 618 155 20 10 L4 28.06319

-96.85299 123.14 619 170 20 10 L4 28.06319

-96.85299 123.14 620 185 20 10 L4 28.06319

-96.85299 123.14 621 200 20 10 L4 28.06319

-96.85299 123.14 2.4.5-45

Long Mott Generating Station Preliminary Safety Analysis Report Table 2.4.5-4 Synthetic Hurricane Parameters (Sheet 24 of 54)

Section 2.4 Hydrology November 2025 Storm ID Bearing

()

Rmax (nm)

T (kt)

Landfall Lat Long P (mb) 622 80 25 10 L4 28.06319

-96.85299 130.42 623 95 25 10 L4 28.06319

-96.85299 130.42 624 110 25 10 L4 28.06319

-96.85299 130.42 625 125 25 10 L4 28.06319

-96.85299 130.42 626 140 25 10 L4 28.06319

-96.85299 130.42 627 155 25 10 L4 28.06319

-96.85299 130.42 628 170 25 10 L4 28.06319

-96.85299 130.42 629 185 25 10 L4 28.06319

-96.85299 130.42 630 200 25 10 L4 28.06319

-96.85299 130.42 631 80 5

15 L4 28.06319

-96.85299 101.74 632 95 5

15 L4 28.06319

-96.85299 101.74 633 110 5

15 L4 28.06319

-96.85299 101.74 634 125 5

15 L4 28.06319

-96.85299 101.74 635 140 5

15 L4 28.06319

-96.85299 101.74 636 155 5

15 L4 28.06319

-96.85299 101.74 637 170 5

15 L4 28.06319

-96.85299 101.74 638 185 5

15 L4 28.06319

-96.85299 101.74 639 200 5

15 L4 28.06319

-96.85299 101.74 640 80 10 15 L4 28.06319

-96.85299 106.64 641 95 10 15 L4 28.06319

-96.85299 106.64 642 110 10 15 L4 28.06319

-96.85299 106.64 643 125 10 15 L4 28.06319

-96.85299 106.64 644 140 10 15 L4 28.06319

-96.85299 106.64 645 155 10 15 L4 28.06319

-96.85299 106.64 646 170 10 15 L4 28.06319

-96.85299 106.64 647 185 10 15 L4 28.06319

-96.85299 106.64 648 200 10 15 L4 28.06319

-96.85299 106.64 2.4.5-46

Long Mott Generating Station Preliminary Safety Analysis Report Table 2.4.5-4 Synthetic Hurricane Parameters (Sheet 25 of 54)

Section 2.4 Hydrology November 2025 Storm ID Bearing

()

Rmax (nm)

T (kt)

Landfall Lat Long P (mb) 649 80 15 15 L4 28.06319

-96.85299 112.59 650 95 15 15 L4 28.06319

-96.85299 112.59 651 110 15 15 L4 28.06319

-96.85299 112.59 652 125 15 15 L4 28.06319

-96.85299 112.59 653 140 15 15 L4 28.06319

-96.85299 112.59 654 155 15 15 L4 28.06319

-96.85299 112.59 655 170 15 15 L4 28.06319

-96.85299 112.59 656 185 15 15 L4 28.06319

-96.85299 112.59 657 200 15 15 L4 28.06319

-96.85299 112.59 658 80 20 15 L4 28.06319

-96.85299 119.42 659 95 20 15 L4 28.06319

-96.85299 119.42 660 110 20 15 L4 28.06319

-96.85299 119.42 661 125 20 15 L4 28.06319

-96.85299 119.42 662 140 20 15 L4 28.06319

-96.85299 119.42 663 155 20 15 L4 28.06319

-96.85299 119.42 664 170 20 15 L4 28.06319

-96.85299 119.42 665 185 20 15 L4 28.06319

-96.85299 119.42 666 200 20 15 L4 28.06319

-96.85299 119.42 667 80 25 15 L4 28.06319

-96.85299 126.8 668 95 25 15 L4 28.06319

-96.85299 126.8 669 110 25 15 L4 28.06319

-96.85299 126.8 670 125 25 15 L4 28.06319

-96.85299 126.8 671 140 25 15 L4 28.06319

-96.85299 126.8 672 155 25 15 L4 28.06319

-96.85299 126.8 673 170 25 15 L4 28.06319

-96.85299 126.8 674 185 25 15 L4 28.06319

-96.85299 126.8 675 200 25 15 L4 28.06319

-96.85299 126.8 2.4.5-47

Long Mott Generating Station Preliminary Safety Analysis Report Table 2.4.5-4 Synthetic Hurricane Parameters (Sheet 26 of 54)

Section 2.4 Hydrology November 2025 Storm ID Bearing

()

Rmax (nm)

T (kt)

Landfall Lat Long P (mb) 676 80 5

20 L4 28.06319

-96.85299 100 677 95 5

20 L4 28.06319

-96.85299 100 678 110 5

20 L4 28.06319

-96.85299 100 679 125 5

20 L4 28.06319

-96.85299 100 680 140 5

20 L4 28.06319

-96.85299 100 681 155 5

20 L4 28.06319

-96.85299 100 682 170 5

20 L4 28.06319

-96.85299 100 683 185 5

20 L4 28.06319

-96.85299 100 684 200 5

20 L4 28.06319

-96.85299 100 685 80 10 20 L4 28.06319

-96.85299 103.07 686 95 10 20 L4 28.06319

-96.85299 103.07 687 110 10 20 L4 28.06319

-96.85299 103.07 688 125 10 20 L4 28.06319

-96.85299 103.07 689 140 10 20 L4 28.06319

-96.85299 103.07 690 155 10 20 L4 28.06319

-96.85299 103.07 691 170 10 20 L4 28.06319

-96.85299 103.07 692 185 10 20 L4 28.06319

-96.85299 103.07 693 200 10 20 L4 28.06319

-96.85299 103.07 694 80 15 20 L4 28.06319

-96.85299 108.87 695 95 15 20 L4 28.06319

-96.85299 108.87 696 110 15 20 L4 28.06319

-96.85299 108.87 697 125 15 20 L4 28.06319

-96.85299 108.87 698 140 15 20 L4 28.06319

-96.85299 108.87 699 155 15 20 L4 28.06319

-96.85299 108.87 700 170 15 20 L4 28.06319

-96.85299 108.87 701 185 15 20 L4 28.06319

-96.85299 108.87 702 200 15 20 L4 28.06319

-96.85299 108.87 2.4.5-48

Long Mott Generating Station Preliminary Safety Analysis Report Table 2.4.5-4 Synthetic Hurricane Parameters (Sheet 27 of 54)

Section 2.4 Hydrology November 2025 Storm ID Bearing

()

Rmax (nm)

T (kt)

Landfall Lat Long P (mb) 703 80 20 20 L4 28.06319

-96.85299 115.71 704 95 20 20 L4 28.06319

-96.85299 115.71 705 110 20 20 L4 28.06319

-96.85299 115.71 706 125 20 20 L4 28.06319

-96.85299 115.71 707 140 20 20 L4 28.06319

-96.85299 115.71 708 155 20 20 L4 28.06319

-96.85299 115.71 709 170 20 20 L4 28.06319

-96.85299 115.71 710 185 20 20 L4 28.06319

-96.85299 115.71 711 200 20 20 L4 28.06319

-96.85299 115.71 712 80 25 20 L4 28.06319

-96.85299 123.14 713 95 25 20 L4 28.06319

-96.85299 123.14 714 110 25 20 L4 28.06319

-96.85299 123.14 715 125 25 20 L4 28.06319

-96.85299 123.14 716 140 25 20 L4 28.06319

-96.85299 123.14 717 155 25 20 L4 28.06319

-96.85299 123.14 718 170 25 20 L4 28.06319

-96.85299 123.14 719 185 25 20 L4 28.06319

-96.85299 123.14 720 200 25 20 L4 28.06319

-96.85299 123.14 721 80 5

5 L5 27.94131

-96.97495 109.17 722 95 5

5 L5 27.94131

-96.97495 109.17 723 110 5

5 L5 27.94131

-96.97495 109.17 724 125 5

5 L5 27.94131

-96.97495 109.17 725 140 5

5 L5 27.94131

-96.97495 109.17 726 155 5

5 L5 27.94131

-96.97495 109.17 727 170 5

5 L5 27.94131

-96.97495 109.17 728 185 5

5 L5 27.94131

-96.97495 109.17 729 200 5

5 L5 27.94131

-96.97495 109.17 2.4.5-49

Long Mott Generating Station Preliminary Safety Analysis Report Table 2.4.5-4 Synthetic Hurricane Parameters (Sheet 28 of 54)

Section 2.4 Hydrology November 2025 Storm ID Bearing

()

Rmax (nm)

T (kt)

Landfall Lat Long P (mb) 730 80 10 5

L5 27.94131

-96.97495 114.31 731 95 10 5

L5 27.94131

-96.97495 114.31 732 110 10 5

L5 27.94131

-96.97495 114.31 733 125 10 5

L5 27.94131

-96.97495 114.31 734 140 10 5

L5 27.94131

-96.97495 114.31 735 155 10 5

L5 27.94131

-96.97495 114.31 736 170 10 5

L5 27.94131

-96.97495 114.31 737 185 10 5

L5 27.94131

-96.97495 114.31 738 200 10 5

L5 27.94131

-96.97495 114.31 739 80 15 5

L5 27.94131

-96.97495 120.26 740 95 15 5

L5 27.94131

-96.97495 120.26 741 110 15 5

L5 27.94131

-96.97495 120.26 742 125 15 5

L5 27.94131

-96.97495 120.26 743 140 15 5

L5 27.94131

-96.97495 120.26 744 155 15 5

L5 27.94131

-96.97495 120.26 745 170 15 5

L5 27.94131

-96.97495 120.26 746 185 15 5

L5 27.94131

-96.97495 120.26 747 200 15 5

L5 27.94131

-96.97495 120.26 748 80 20 5

L5 27.94131

-96.97495 126.8 749 95 20 5

L5 27.94131

-96.97495 126.8 750 110 20 5

L5 27.94131

-96.97495 126.8 751 125 20 5

L5 27.94131

-96.97495 126.8 752 140 20 5

L5 27.94131

-96.97495 126.8 753 155 20 5

L5 27.94131

-96.97495 126.8 754 170 20 5

L5 27.94131

-96.97495 126.8 755 185 20 5

L5 27.94131

-96.97495 126.8 756 200 20 5

L5 27.94131

-96.97495 126.8 2.4.5-50

Long Mott Generating Station Preliminary Safety Analysis Report Table 2.4.5-4 Synthetic Hurricane Parameters (Sheet 29 of 54)

Section 2.4 Hydrology November 2025 Storm ID Bearing

()

Rmax (nm)

T (kt)

Landfall Lat Long P (mb) 757 80 25 5

L5 27.94131

-96.97495 133.1 758 95 25 5

L5 27.94131

-96.97495 133.1 759 110 25 5

L5 27.94131

-96.97495 133.1 760 125 25 5

L5 27.94131

-96.97495 133.1 761 140 25 5

L5 27.94131

-96.97495 133.1 762 155 25 5

L5 27.94131

-96.97495 133.1 763 170 25 5

L5 27.94131

-96.97495 133.1 764 185 25 5

L5 27.94131

-96.97495 133.1 765 200 25 5

L5 27.94131

-96.97495 133.1 766 80 5

10 L5 27.94131

-96.97495 105.42 767 95 5

10 L5 27.94131

-96.97495 105.42 768 110 5

10 L5 27.94131

-96.97495 105.42 769 125 5

10 L5 27.94131

-96.97495 105.42 770 140 5

10 L5 27.94131

-96.97495 105.42 771 155 5

10 L5 27.94131

-96.97495 105.42 772 170 5

10 L5 27.94131

-96.97495 105.42 773 185 5

10 L5 27.94131

-96.97495 105.42 774 200 5

10 L5 27.94131

-96.97495 105.42 775 80 10 10 L5 27.94131

-96.97495 110.4 776 95 10 10 L5 27.94131

-96.97495 110.4 777 110 10 10 L5 27.94131

-96.97495 110.4 778 125 10 10 L5 27.94131

-96.97495 110.4 779 140 10 10 L5 27.94131

-96.97495 110.4 780 155 10 10 L5 27.94131

-96.97495 110.4 781 170 10 10 L5 27.94131

-96.97495 110.4 782 185 10 10 L5 27.94131

-96.97495 110.4 783 200 10 10 L5 27.94131

-96.97495 110.4 2.4.5-51

Long Mott Generating Station Preliminary Safety Analysis Report Table 2.4.5-4 Synthetic Hurricane Parameters (Sheet 30 of 54)

Section 2.4 Hydrology November 2025 Storm ID Bearing

()

Rmax (nm)

T (kt)

Landfall Lat Long P (mb) 784 80 15 10 L5 27.94131

-96.97495 116.3 785 95 15 10 L5 27.94131

-96.97495 116.3 786 110 15 10 L5 27.94131

-96.97495 116.3 787 125 15 10 L5 27.94131

-96.97495 116.3 788 140 15 10 L5 27.94131

-96.97495 116.3 789 155 15 10 L5 27.94131

-96.97495 116.3 790 170 15 10 L5 27.94131

-96.97495 116.3 791 185 15 10 L5 27.94131

-96.97495 116.3 792 200 15 10 L5 27.94131

-96.97495 116.3 793 80 20 10 L5 27.94131

-96.97495 123.14 794 95 20 10 L5 27.94131

-96.97495 123.14 795 110 20 10 L5 27.94131

-96.97495 123.14 796 125 20 10 L5 27.94131

-96.97495 123.14 797 140 20 10 L5 27.94131

-96.97495 123.14 798 155 20 10 L5 27.94131

-96.97495 123.14 799 170 20 10 L5 27.94131

-96.97495 123.14 800 185 20 10 L5 27.94131

-96.97495 123.14 801 200 20 10 L5 27.94131

-96.97495 123.14 802 80 25 10 L5 27.94131

-96.97495 130.42 803 95 25 10 L5 27.94131

-96.97495 130.42 804 110 25 10 L5 27.94131

-96.97495 130.42 805 125 25 10 L5 27.94131

-96.97495 130.42 806 140 25 10 L5 27.94131

-96.97495 130.42 807 155 25 10 L5 27.94131

-96.97495 130.42 808 170 25 10 L5 27.94131

-96.97495 130.42 809 185 25 10 L5 27.94131

-96.97495 130.42 810 200 25 10 L5 27.94131

-96.97495 130.42 2.4.5-52

Long Mott Generating Station Preliminary Safety Analysis Report Table 2.4.5-4 Synthetic Hurricane Parameters (Sheet 31 of 54)

Section 2.4 Hydrology November 2025 Storm ID Bearing

()

Rmax (nm)

T (kt)

Landfall Lat Long P (mb) 811 80 5

15 L5 27.94131

-96.97495 101.74 812 95 5

15 L5 27.94131

-96.97495 101.74 813 110 5

15 L5 27.94131

-96.97495 101.74 814 125 5

15 L5 27.94131

-96.97495 101.74 815 140 5

15 L5 27.94131

-96.97495 101.74 816 155 5

15 L5 27.94131

-96.97495 101.74 817 170 5

15 L5 27.94131

-96.97495 101.74 818 185 5

15 L5 27.94131

-96.97495 101.74 819 200 5

15 L5 27.94131

-96.97495 101.74 820 80 10 15 L5 27.94131

-96.97495 106.64 821 95 10 15 L5 27.94131

-96.97495 106.64 822 110 10 15 L5 27.94131

-96.97495 106.64 823 125 10 15 L5 27.94131

-96.97495 106.64 824 140 10 15 L5 27.94131

-96.97495 106.64 825 155 10 15 L5 27.94131

-96.97495 106.64 826 170 10 15 L5 27.94131

-96.97495 106.64 827 185 10 15 L5 27.94131

-96.97495 106.64 828 200 10 15 L5 27.94131

-96.97495 106.64 829 80 15 15 L5 27.94131

-96.97495 112.59 830 95 15 15 L5 27.94131

-96.97495 112.59 831 110 15 15 L5 27.94131

-96.97495 112.59 832 125 15 15 L5 27.94131

-96.97495 112.59 833 140 15 15 L5 27.94131

-96.97495 112.59 834 155 15 15 L5 27.94131

-96.97495 112.59 835 170 15 15 L5 27.94131

-96.97495 112.59 836 185 15 15 L5 27.94131

-96.97495 112.59 837 200 15 15 L5 27.94131

-96.97495 112.59 2.4.5-53

Long Mott Generating Station Preliminary Safety Analysis Report Table 2.4.5-4 Synthetic Hurricane Parameters (Sheet 32 of 54)

Section 2.4 Hydrology November 2025 Storm ID Bearing

()

Rmax (nm)

T (kt)

Landfall Lat Long P (mb) 838 80 20 15 L5 27.94131

-96.97495 119.42 839 95 20 15 L5 27.94131

-96.97495 119.42 840 110 20 15 L5 27.94131

-96.97495 119.42 841 125 20 15 L5 27.94131

-96.97495 119.42 842 140 20 15 L5 27.94131

-96.97495 119.42 843 155 20 15 L5 27.94131

-96.97495 119.42 844 170 20 15 L5 27.94131

-96.97495 119.42 845 185 20 15 L5 27.94131

-96.97495 119.42 846 200 20 15 L5 27.94131

-96.97495 119.42 847 80 25 15 L5 27.94131

-96.97495 126.8 848 95 25 15 L5 27.94131

-96.97495 126.8 849 110 25 15 L5 27.94131

-96.97495 126.8 850 125 25 15 L5 27.94131

-96.97495 126.8 851 140 25 15 L5 27.94131

-96.97495 126.8 852 155 25 15 L5 27.94131

-96.97495 126.8 853 170 25 15 L5 27.94131

-96.97495 126.8 854 185 25 15 L5 27.94131

-96.97495 126.8 855 200 25 15 L5 27.94131

-96.97495 126.8 856 80 5

20 L5 27.94131

-96.97495 100 857 95 5

20 L5 27.94131

-96.97495 100 858 110 5

20 L5 27.94131

-96.97495 100 859 125 5

20 L5 27.94131

-96.97495 100 860 140 5

20 L5 27.94131

-96.97495 100 861 155 5

20 L5 27.94131

-96.97495 100 862 170 5

20 L5 27.94131

-96.97495 100 863 185 5

20 L5 27.94131

-96.97495 100 864 200 5

20 L5 27.94131

-96.97495 100 2.4.5-54

Long Mott Generating Station Preliminary Safety Analysis Report Table 2.4.5-4 Synthetic Hurricane Parameters (Sheet 33 of 54)

Section 2.4 Hydrology November 2025 Storm ID Bearing

()

Rmax (nm)

T (kt)

Landfall Lat Long P (mb) 865 80 10 20 L5 27.94131

-96.97495 103.07 866 95 10 20 L5 27.94131

-96.97495 103.07 867 110 10 20 L5 27.94131

-96.97495 103.07 868 125 10 20 L5 27.94131

-96.97495 103.07 869 140 10 20 L5 27.94131

-96.97495 103.07 870 155 10 20 L5 27.94131

-96.97495 103.07 871 170 10 20 L5 27.94131

-96.97495 103.07 872 185 10 20 L5 27.94131

-96.97495 103.07 873 200 10 20 L5 27.94131

-96.97495 103.07 874 80 15 20 L5 27.94131

-96.97495 108.87 875 95 15 20 L5 27.94131

-96.97495 108.87 876 110 15 20 L5 27.94131

-96.97495 108.87 877 125 15 20 L5 27.94131

-96.97495 108.87 878 140 15 20 L5 27.94131

-96.97495 108.87 879 155 15 20 L5 27.94131

-96.97495 108.87 880 170 15 20 L5 27.94131

-96.97495 108.87 881 185 15 20 L5 27.94131

-96.97495 108.87 882 200 15 20 L5 27.94131

-96.97495 108.87 883 80 20 20 L5 27.94131

-96.97495 115.71 884 95 20 20 L5 27.94131

-96.97495 115.71 885 110 20 20 L5 27.94131

-96.97495 115.71 886 125 20 20 L5 27.94131

-96.97495 115.71 887 140 20 20 L5 27.94131

-96.97495 115.71 888 155 20 20 L5 27.94131

-96.97495 115.71 889 170 20 20 L5 27.94131

-96.97495 115.71 890 185 20 20 L5 27.94131

-96.97495 115.71 891 200 20 20 L5 27.94131

-96.97495 115.71 2.4.5-55

Long Mott Generating Station Preliminary Safety Analysis Report Table 2.4.5-4 Synthetic Hurricane Parameters (Sheet 34 of 54)

Section 2.4 Hydrology November 2025 Storm ID Bearing

()

Rmax (nm)

T (kt)

Landfall Lat Long P (mb) 892 80 25 20 L5 27.94131

-96.97495 123.14 893 95 25 20 L5 27.94131

-96.97495 123.14 894 110 25 20 L5 27.94131

-96.97495 123.14 895 125 25 20 L5 27.94131

-96.97495 123.14 896 140 25 20 L5 27.94131

-96.97495 123.14 897 155 25 20 L5 27.94131

-96.97495 123.14 898 170 25 20 L5 27.94131

-96.97495 123.14 899 185 25 20 L5 27.94131

-96.97495 123.14 900 200 25 20 L5 27.94131

-96.97495 123.14 901 80 5

5 L6 27.80377

-97.07635 109.17 902 95 5

5 L6 27.80377

-97.07635 109.17 903 110 5

5 L6 27.80377

-97.07635 109.17 904 125 5

5 L6 27.80377

-97.07635 109.17 905 140 5

5 L6 27.80377

-97.07635 109.17 906 155 5

5 L6 27.80377

-97.07635 109.17 907 170 5

5 L6 27.80377

-97.07635 109.17 908 185 5

5 L6 27.80377

-97.07635 109.17 909 200 5

5 L6 27.80377

-97.07635 109.17 910 80 10 5

L6 27.80377

-97.07635 114.31 911 95 10 5

L6 27.80377

-97.07635 114.31 912 110 10 5

L6 27.80377

-97.07635 114.31 913 125 10 5

L6 27.80377

-97.07635 114.31 914 140 10 5

L6 27.80377

-97.07635 114.31 915 155 10 5

L6 27.80377

-97.07635 114.31 916 170 10 5

L6 27.80377

-97.07635 114.31 917 185 10 5

L6 27.80377

-97.07635 114.31 918 200 10 5

L6 27.80377

-97.07635 114.31 2.4.5-56

Long Mott Generating Station Preliminary Safety Analysis Report Table 2.4.5-4 Synthetic Hurricane Parameters (Sheet 35 of 54)

Section 2.4 Hydrology November 2025 Storm ID Bearing

()

Rmax (nm)

T (kt)

Landfall Lat Long P (mb) 919 80 15 5

L6 27.80377

-97.07635 120.26 920 95 15 5

L6 27.80377

-97.07635 120.26 921 110 15 5

L6 27.80377

-97.07635 120.26 922 125 15 5

L6 27.80377

-97.07635 120.26 923 140 15 5

L6 27.80377

-97.07635 120.26 924 155 15 5

L6 27.80377

-97.07635 120.26 925 170 15 5

L6 27.80377

-97.07635 120.26 926 185 15 5

L6 27.80377

-97.07635 120.26 927 200 15 5

L6 27.80377

-97.07635 120.26 928 80 20 5

L6 27.80377

-97.07635 126.8 929 95 20 5

L6 27.80377

-97.07635 126.8 930 110 20 5

L6 27.80377

-97.07635 126.8 931 125 20 5

L6 27.80377

-97.07635 126.8 932 140 20 5

L6 27.80377

-97.07635 126.8 933 155 20 5

L6 27.80377

-97.07635 126.8 934 170 20 5

L6 27.80377

-97.07635 126.8 935 185 20 5

L6 27.80377

-97.07635 126.8 936 200 20 5

L6 27.80377

-97.07635 126.8 937 80 25 5

L6 27.80377

-97.07635 133.1 938 95 25 5

L6 27.80377

-97.07635 133.1 939 110 25 5

L6 27.80377

-97.07635 133.1 940 125 25 5

L6 27.80377

-97.07635 133.1 941 140 25 5

L6 27.80377

-97.07635 133.1 942 155 25 5

L6 27.80377

-97.07635 133.1 943 170 25 5

L6 27.80377

-97.07635 133.1 944 185 25 5

L6 27.80377

-97.07635 133.1 945 200 25 5

L6 27.80377

-97.07635 133.1 2.4.5-57

Long Mott Generating Station Preliminary Safety Analysis Report Table 2.4.5-4 Synthetic Hurricane Parameters (Sheet 36 of 54)

Section 2.4 Hydrology November 2025 Storm ID Bearing

()

Rmax (nm)

T (kt)

Landfall Lat Long P (mb) 946 80 5

10 L6 27.80377

-97.07635 105.42 947 95 5

10 L6 27.80377

-97.07635 105.42 948 110 5

10 L6 27.80377

-97.07635 105.42 949 125 5

10 L6 27.80377

-97.07635 105.42 950 140 5

10 L6 27.80377

-97.07635 105.42 951 155 5

10 L6 27.80377

-97.07635 105.42 952 170 5

10 L6 27.80377

-97.07635 105.42 953 185 5

10 L6 27.80377

-97.07635 105.42 954 200 5

10 L6 27.80377

-97.07635 105.42 955 80 10 10 L6 27.80377

-97.07635 110.4 956 95 10 10 L6 27.80377

-97.07635 110.4 957 110 10 10 L6 27.80377

-97.07635 110.4 958 125 10 10 L6 27.80377

-97.07635 110.4 959 140 10 10 L6 27.80377

-97.07635 110.4 960 155 10 10 L6 27.80377

-97.07635 110.4 961 170 10 10 L6 27.80377

-97.07635 110.4 962 185 10 10 L6 27.80377

-97.07635 110.4 963 200 10 10 L6 27.80377

-97.07635 110.4 964 80 15 10 L6 27.80377

-97.07635 116.3 965 95 15 10 L6 27.80377

-97.07635 116.3 966 110 15 10 L6 27.80377

-97.07635 116.3 967 125 15 10 L6 27.80377

-97.07635 116.3 968 140 15 10 L6 27.80377

-97.07635 116.3 969 155 15 10 L6 27.80377

-97.07635 116.3 970 170 15 10 L6 27.80377

-97.07635 116.3 971 185 15 10 L6 27.80377

-97.07635 116.3 972 200 15 10 L6 27.80377

-97.07635 116.3 2.4.5-58

Long Mott Generating Station Preliminary Safety Analysis Report Table 2.4.5-4 Synthetic Hurricane Parameters (Sheet 37 of 54)

Section 2.4 Hydrology November 2025 Storm ID Bearing

()

Rmax (nm)

T (kt)

Landfall Lat Long P (mb) 973 80 20 10 L6 27.80377

-97.07635 123.14 974 95 20 10 L6 27.80377

-97.07635 123.14 975 110 20 10 L6 27.80377

-97.07635 123.14 976 125 20 10 L6 27.80377

-97.07635 123.14 977 140 20 10 L6 27.80377

-97.07635 123.14 978 155 20 10 L6 27.80377

-97.07635 123.14 979 170 20 10 L6 27.80377

-97.07635 123.14 980 185 20 10 L6 27.80377

-97.07635 123.14 981 200 20 10 L6 27.80377

-97.07635 123.14 982 80 25 10 L6 27.80377

-97.07635 130.42 983 95 25 10 L6 27.80377

-97.07635 130.42 984 110 25 10 L6 27.80377

-97.07635 130.42 985 125 25 10 L6 27.80377

-97.07635 130.42 986 140 25 10 L6 27.80377

-97.07635 130.42 987 155 25 10 L6 27.80377

-97.07635 130.42 988 170 25 10 L6 27.80377

-97.07635 130.42 989 185 25 10 L6 27.80377

-97.07635 130.42 990 200 25 10 L6 27.80377

-97.07635 130.42 991 80 5

15 L6 27.80377

-97.07635 101.74 992 95 5

15 L6 27.80377

-97.07635 101.74 993 110 5

15 L6 27.80377

-97.07635 101.74 994 125 5

15 L6 27.80377

-97.07635 101.74 995 140 5

15 L6 27.80377

-97.07635 101.74 996 155 5

15 L6 27.80377

-97.07635 101.74 997 170 5

15 L6 27.80377

-97.07635 101.74 998 185 5

15 L6 27.80377

-97.07635 101.74 999 200 5

15 L6 27.80377

-97.07635 101.74 2.4.5-59

Long Mott Generating Station Preliminary Safety Analysis Report Table 2.4.5-4 Synthetic Hurricane Parameters (Sheet 38 of 54)

Section 2.4 Hydrology November 2025 Storm ID Bearing

()

Rmax (nm)

T (kt)

Landfall Lat Long P (mb) 1000 80 10 15 L6 27.80377

-97.07635 106.64 1001 95 10 15 L6 27.80377

-97.07635 106.64 1002 110 10 15 L6 27.80377

-97.07635 106.64 1003 125 10 15 L6 27.80377

-97.07635 106.64 1004 140 10 15 L6 27.80377

-97.07635 106.64 1005 155 10 15 L6 27.80377

-97.07635 106.64 1006 170 10 15 L6 27.80377

-97.07635 106.64 1007 185 10 15 L6 27.80377

-97.07635 106.64 1008 200 10 15 L6 27.80377

-97.07635 106.64 1009 80 15 15 L6 27.80377

-97.07635 112.59 1010 95 15 15 L6 27.80377

-97.07635 112.59 1011 110 15 15 L6 27.80377

-97.07635 112.59 1012 125 15 15 L6 27.80377

-97.07635 112.59 1013 140 15 15 L6 27.80377

-97.07635 112.59 1014 155 15 15 L6 27.80377

-97.07635 112.59 1015 170 15 15 L6 27.80377

-97.07635 112.59 1016 185 15 15 L6 27.80377

-97.07635 112.59 1017 200 15 15 L6 27.80377

-97.07635 112.59 1018 80 20 15 L6 27.80377

-97.07635 119.42 1019 95 20 15 L6 27.80377

-97.07635 119.42 1020 110 20 15 L6 27.80377

-97.07635 119.42 1021 125 20 15 L6 27.80377

-97.07635 119.42 1022 140 20 15 L6 27.80377

-97.07635 119.42 1023 155 20 15 L6 27.80377

-97.07635 119.42 1024 170 20 15 L6 27.80377

-97.07635 119.42 1025 185 20 15 L6 27.80377

-97.07635 119.42 1026 200 20 15 L6 27.80377

-97.07635 119.42 2.4.5-60

Long Mott Generating Station Preliminary Safety Analysis Report Table 2.4.5-4 Synthetic Hurricane Parameters (Sheet 39 of 54)

Section 2.4 Hydrology November 2025 Storm ID Bearing

()

Rmax (nm)

T (kt)

Landfall Lat Long P (mb) 1027 80 25 15 L6 27.80377

-97.07635 126.8 1028 95 25 15 L6 27.80377

-97.07635 126.8 1029 110 25 15 L6 27.80377

-97.07635 126.8 1030 125 25 15 L6 27.80377

-97.07635 126.8 1031 140 25 15 L6 27.80377

-97.07635 126.8 1032 155 25 15 L6 27.80377

-97.07635 126.8 1033 170 25 15 L6 27.80377

-97.07635 126.8 1034 185 25 15 L6 27.80377

-97.07635 126.8 1035 200 25 15 L6 27.80377

-97.07635 126.8 1036 80 5

20 L6 27.80377

-97.07635 100 1037 95 5

20 L6 27.80377

-97.07635 100 1038 110 5

20 L6 27.80377

-97.07635 100 1039 125 5

20 L6 27.80377

-97.07635 100 1040 140 5

20 L6 27.80377

-97.07635 100 1041 155 5

20 L6 27.80377

-97.07635 100 1042 170 5

20 L6 27.80377

-97.07635 100 1043 185 5

20 L6 27.80377

-97.07635 100 1044 200 5

20 L6 27.80377

-97.07635 100 1045 80 10 20 L6 27.80377

-97.07635 103.07 1046 95 10 20 L6 27.80377

-97.07635 103.07 1047 110 10 20 L6 27.80377

-97.07635 103.07 1048 125 10 20 L6 27.80377

-97.07635 103.07 1049 140 10 20 L6 27.80377

-97.07635 103.07 1050 155 10 20 L6 27.80377

-97.07635 103.07 1051 170 10 20 L6 27.80377

-97.07635 103.07 1052 185 10 20 L6 27.80377

-97.07635 103.07 1053 200 10 20 L6 27.80377

-97.07635 103.07 2.4.5-61

Long Mott Generating Station Preliminary Safety Analysis Report Table 2.4.5-4 Synthetic Hurricane Parameters (Sheet 40 of 54)

Section 2.4 Hydrology November 2025 Storm ID Bearing

()

Rmax (nm)

T (kt)

Landfall Lat Long P (mb) 1054 80 15 20 L6 27.80377

-97.07635 108.87 1055 95 15 20 L6 27.80377

-97.07635 108.87 1056 110 15 20 L6 27.80377

-97.07635 108.87 1057 125 15 20 L6 27.80377

-97.07635 108.87 1058 140 15 20 L6 27.80377

-97.07635 108.87 1059 155 15 20 L6 27.80377

-97.07635 108.87 1060 170 15 20 L6 27.80377

-97.07635 108.87 1061 185 15 20 L6 27.80377

-97.07635 108.87 1062 200 15 20 L6 27.80377

-97.07635 108.87 1063 80 20 20 L6 27.80377

-97.07635 115.71 1064 95 20 20 L6 27.80377

-97.07635 115.71 1065 110 20 20 L6 27.80377

-97.07635 115.71 1066 125 20 20 L6 27.80377

-97.07635 115.71 1067 140 20 20 L6 27.80377

-97.07635 115.71 1068 155 20 20 L6 27.80377

-97.07635 115.71 1069 170 20 20 L6 27.80377

-97.07635 115.71 1070 185 20 20 L6 27.80377

-97.07635 115.71 1071 200 20 20 L6 27.80377

-97.07635 115.71 1072 80 25 20 L6 27.80377

-97.07635 123.14 1073 95 25 20 L6 27.80377

-97.07635 123.14 1074 110 25 20 L6 27.80377

-97.07635 123.14 1075 125 25 20 L6 27.80377

-97.07635 123.14 1076 140 25 20 L6 27.80377

-97.07635 123.14 1077 155 25 20 L6 27.80377

-97.07635 123.14 1078 170 25 20 L6 27.80377

-97.07635 123.14 1079 185 25 20 L6 27.80377

-97.07635 123.14 1080 200 25 20 L6 27.80377

-97.07635 123.14 2.4.5-62

Long Mott Generating Station Preliminary Safety Analysis Report Table 2.4.5-4 Synthetic Hurricane Parameters (Sheet 41 of 54)

Section 2.4 Hydrology November 2025 Storm ID Bearing

()

Rmax (nm)

T (kt)

Landfall Lat Long P (mb) 1081 80 5

5 L7 27.66018

-97.17836 109.17 1082 95 5

5 L7 27.66018

-97.17836 109.17 1083 110 5

5 L7 27.66018

-97.17836 109.17 1084 125 5

5 L7 27.66018

-97.17836 109.17 1085 140 5

5 L7 27.66018

-97.17836 109.17 1086 155 5

5 L7 27.66018

-97.17836 109.17 1087 170 5

5 L7 27.66018

-97.17836 109.17 1088 185 5

5 L7 27.66018

-97.17836 109.17 1089 200 5

5 L7 27.66018

-97.17836 109.17 1090 80 10 5

L7 27.66018

-97.17836 114.31 1091 95 10 5

L7 27.66018

-97.17836 114.31 1092 110 10 5

L7 27.66018

-97.17836 114.31 1093 125 10 5

L7 27.66018

-97.17836 114.31 1094 140 10 5

L7 27.66018

-97.17836 114.31 1095 155 10 5

L7 27.66018

-97.17836 114.31 1096 170 10 5

L7 27.66018

-97.17836 114.31 1097 185 10 5

L7 27.66018

-97.17836 114.31 1098 200 10 5

L7 27.66018

-97.17836 114.31 1099 80 15 5

L7 27.66018

-97.17836 120.26 1100 95 15 5

L7 27.66018

-97.17836 120.26 1101 110 15 5

L7 27.66018

-97.17836 120.26 1102 125 15 5

L7 27.66018

-97.17836 120.26 1103 140 15 5

L7 27.66018

-97.17836 120.26 1104 155 15 5

L7 27.66018

-97.17836 120.26 1105 170 15 5

L7 27.66018

-97.17836 120.26 1106 185 15 5

L7 27.66018

-97.17836 120.26 1107 200 15 5

L7 27.66018

-97.17836 120.26 2.4.5-63

Long Mott Generating Station Preliminary Safety Analysis Report Table 2.4.5-4 Synthetic Hurricane Parameters (Sheet 42 of 54)

Section 2.4 Hydrology November 2025 Storm ID Bearing

()

Rmax (nm)

T (kt)

Landfall Lat Long P (mb) 1108 80 20 5

L7 27.66018

-97.17836 126.8 1109 95 20 5

L7 27.66018

-97.17836 126.8 1110 110 20 5

L7 27.66018

-97.17836 126.8 1111 125 20 5

L7 27.66018

-97.17836 126.8 1112 140 20 5

L7 27.66018

-97.17836 126.8 1113 155 20 5

L7 27.66018

-97.17836 126.8 1114 170 20 5

L7 27.66018

-97.17836 126.8 1115 185 20 5

L7 27.66018

-97.17836 126.8 1116 200 20 5

L7 27.66018

-97.17836 126.8 1117 80 25 5

L7 27.66018

-97.17836 133.1 1118 95 25 5

L7 27.66018

-97.17836 133.1 1119 110 25 5

L7 27.66018

-97.17836 133.1 1120 125 25 5

L7 27.66018

-97.17836 133.1 1121 140 25 5

L7 27.66018

-97.17836 133.1 1122 155 25 5

L7 27.66018

-97.17836 133.1 1123 170 25 5

L7 27.66018

-97.17836 133.1 1124 185 25 5

L7 27.66018

-97.17836 133.1 1125 200 25 5

L7 27.66018

-97.17836 133.1 1126 80 5

10 L7 27.66018

-97.17836 105.42 1127 95 5

10 L7 27.66018

-97.17836 105.42 1128 110 5

10 L7 27.66018

-97.17836 105.42 1129 125 5

10 L7 27.66018

-97.17836 105.42 1130 140 5

10 L7 27.66018

-97.17836 105.42 1131 155 5

10 L7 27.66018

-97.17836 105.42 1132 170 5

10 L7 27.66018

-97.17836 105.42 1133 185 5

10 L7 27.66018

-97.17836 105.42 1134 200 5

10 L7 27.66018

-97.17836 105.42 2.4.5-64

Long Mott Generating Station Preliminary Safety Analysis Report Table 2.4.5-4 Synthetic Hurricane Parameters (Sheet 43 of 54)

Section 2.4 Hydrology November 2025 Storm ID Bearing

()

Rmax (nm)

T (kt)

Landfall Lat Long P (mb) 1135 80 10 10 L7 27.66018

-97.17836 110.4 1136 95 10 10 L7 27.66018

-97.17836 110.4 1137 110 10 10 L7 27.66018

-97.17836 110.4 1138 125 10 10 L7 27.66018

-97.17836 110.4 1139 140 10 10 L7 27.66018

-97.17836 110.4 1140 155 10 10 L7 27.66018

-97.17836 110.4 1141 170 10 10 L7 27.66018

-97.17836 110.4 1142 185 10 10 L7 27.66018

-97.17836 110.4 1143 200 10 10 L7 27.66018

-97.17836 110.4 1144 80 15 10 L7 27.66018

-97.17836 116.3 1145 95 15 10 L7 27.66018

-97.17836 116.3 1146 110 15 10 L7 27.66018

-97.17836 116.3 1147 125 15 10 L7 27.66018

-97.17836 116.3 1148 140 15 10 L7 27.66018

-97.17836 116.3 1149 155 15 10 L7 27.66018

-97.17836 116.3 1150 170 15 10 L7 27.66018

-97.17836 116.3 1151 185 15 10 L7 27.66018

-97.17836 116.3 1152 200 15 10 L7 27.66018

-97.17836 116.3 1153 80 20 10 L7 27.66018

-97.17836 123.14 1154 95 20 10 L7 27.66018

-97.17836 123.14 1155 110 20 10 L7 27.66018

-97.17836 123.14 1156 125 20 10 L7 27.66018

-97.17836 123.14 1157 140 20 10 L7 27.66018

-97.17836 123.14 1158 155 20 10 L7 27.66018

-97.17836 123.14 1159 170 20 10 L7 27.66018

-97.17836 123.14 1160 185 20 10 L7 27.66018

-97.17836 123.14 1161 200 20 10 L7 27.66018

-97.17836 123.14 2.4.5-65

Long Mott Generating Station Preliminary Safety Analysis Report Table 2.4.5-4 Synthetic Hurricane Parameters (Sheet 44 of 54)

Section 2.4 Hydrology November 2025 Storm ID Bearing

()

Rmax (nm)

T (kt)

Landfall Lat Long P (mb) 1162 80 25 10 L7 27.66018

-97.17836 130.42 1163 95 25 10 L7 27.66018

-97.17836 130.42 1164 110 25 10 L7 27.66018

-97.17836 130.42 1165 125 25 10 L7 27.66018

-97.17836 130.42 1166 140 25 10 L7 27.66018

-97.17836 130.42 1167 155 25 10 L7 27.66018

-97.17836 130.42 1168 170 25 10 L7 27.66018

-97.17836 130.42 1169 185 25 10 L7 27.66018

-97.17836 130.42 1170 200 25 10 L7 27.66018

-97.17836 130.42 1171 80 5

15 L7 27.66018

-97.17836 101.74 1172 95 5

15 L7 27.66018

-97.17836 101.74 1173 110 5

15 L7 27.66018

-97.17836 101.74 1174 125 5

15 L7 27.66018

-97.17836 101.74 1175 140 5

15 L7 27.66018

-97.17836 101.74 1176 155 5

15 L7 27.66018

-97.17836 101.74 1177 170 5

15 L7 27.66018

-97.17836 101.74 1178 185 5

15 L7 27.66018

-97.17836 101.74 1179 200 5

15 L7 27.66018

-97.17836 101.74 1180 80 10 15 L7 27.66018

-97.17836 106.64 1181 95 10 15 L7 27.66018

-97.17836 106.64 1182 110 10 15 L7 27.66018

-97.17836 106.64 1183 125 10 15 L7 27.66018

-97.17836 106.64 1184 140 10 15 L7 27.66018

-97.17836 106.64 1185 155 10 15 L7 27.66018

-97.17836 106.64 1186 170 10 15 L7 27.66018

-97.17836 106.64 1187 185 10 15 L7 27.66018

-97.17836 106.64 1188 200 10 15 L7 27.66018

-97.17836 106.64 2.4.5-66

Long Mott Generating Station Preliminary Safety Analysis Report Table 2.4.5-4 Synthetic Hurricane Parameters (Sheet 45 of 54)

Section 2.4 Hydrology November 2025 Storm ID Bearing

()

Rmax (nm)

T (kt)

Landfall Lat Long P (mb) 1189 80 15 15 L7 27.66018

-97.17836 112.59 1190 95 15 15 L7 27.66018

-97.17836 112.59 1191 110 15 15 L7 27.66018

-97.17836 112.59 1192 125 15 15 L7 27.66018

-97.17836 112.59 1193 140 15 15 L7 27.66018

-97.17836 112.59 1194 155 15 15 L7 27.66018

-97.17836 112.59 1195 170 15 15 L7 27.66018

-97.17836 112.59 1196 185 15 15 L7 27.66018

-97.17836 112.59 1197 200 15 15 L7 27.66018

-97.17836 112.59 1198 80 20 15 L7 27.66018

-97.17836 119.42 1199 95 20 15 L7 27.66018

-97.17836 119.42 1200 110 20 15 L7 27.66018

-97.17836 119.42 1201 125 20 15 L7 27.66018

-97.17836 119.42 1202 140 20 15 L7 27.66018

-97.17836 119.42 1203 155 20 15 L7 27.66018

-97.17836 119.42 1204 170 20 15 L7 27.66018

-97.17836 119.42 1205 185 20 15 L7 27.66018

-97.17836 119.42 1206 200 20 15 L7 27.66018

-97.17836 119.42 1207 80 25 15 L7 27.66018

-97.17836 126.8 1208 95 25 15 L7 27.66018

-97.17836 126.8 1209 110 25 15 L7 27.66018

-97.17836 126.8 1210 125 25 15 L7 27.66018

-97.17836 126.8 1211 140 25 15 L7 27.66018

-97.17836 126.8 1212 155 25 15 L7 27.66018

-97.17836 126.8 1213 170 25 15 L7 27.66018

-97.17836 126.8 1214 185 25 15 L7 27.66018

-97.17836 126.8 1215 200 25 15 L7 27.66018

-97.17836 126.8 2.4.5-67

Long Mott Generating Station Preliminary Safety Analysis Report Table 2.4.5-4 Synthetic Hurricane Parameters (Sheet 46 of 54)

Section 2.4 Hydrology November 2025 Storm ID Bearing

()

Rmax (nm)

T (kt)

Landfall Lat Long P (mb) 1216 80 5

20 L7 27.66018

-97.17836 100 1217 95 5

20 L7 27.66018

-97.17836 100 1218 110 5

20 L7 27.66018

-97.17836 100 1219 125 5

20 L7 27.66018

-97.17836 100 1220 140 5

20 L7 27.66018

-97.17836 100 1221 155 5

20 L7 27.66018

-97.17836 100 1222 170 5

20 L7 27.66018

-97.17836 100 1223 185 5

20 L7 27.66018

-97.17836 100 1224 200 5

20 L7 27.66018

-97.17836 100 1225 80 10 20 L7 27.66018

-97.17836 103.07 1226 95 10 20 L7 27.66018

-97.17836 103.07 1227 110 10 20 L7 27.66018

-97.17836 103.07 1228 125 10 20 L7 27.66018

-97.17836 103.07 1229 140 10 20 L7 27.66018

-97.17836 103.07 1230 155 10 20 L7 27.66018

-97.17836 103.07 1231 170 10 20 L7 27.66018

-97.17836 103.07 1232 185 10 20 L7 27.66018

-97.17836 103.07 1233 200 10 20 L7 27.66018

-97.17836 103.07 1234 80 15 20 L7 27.66018

-97.17836 108.87 1235 95 15 20 L7 27.66018

-97.17836 108.87 1236 110 15 20 L7 27.66018

-97.17836 108.87 1237 125 15 20 L7 27.66018

-97.17836 108.87 1238 140 15 20 L7 27.66018

-97.17836 108.87 1239 155 15 20 L7 27.66018

-97.17836 108.87 1240 170 15 20 L7 27.66018

-97.17836 108.87 1241 185 15 20 L7 27.66018

-97.17836 108.87 1242 200 15 20 L7 27.66018

-97.17836 108.87 2.4.5-68

Long Mott Generating Station Preliminary Safety Analysis Report Table 2.4.5-4 Synthetic Hurricane Parameters (Sheet 47 of 54)

Section 2.4 Hydrology November 2025 Storm ID Bearing

()

Rmax (nm)

T (kt)

Landfall Lat Long P (mb) 1243 80 20 20 L7 27.66018

-97.17836 115.71 1244 95 20 20 L7 27.66018

-97.17836 115.71 1245 110 20 20 L7 27.66018

-97.17836 115.71 1246 125 20 20 L7 27.66018

-97.17836 115.71 1247 140 20 20 L7 27.66018

-97.17836 115.71 1248 155 20 20 L7 27.66018

-97.17836 115.71 1249 170 20 20 L7 27.66018

-97.17836 115.71 1250 185 20 20 L7 27.66018

-97.17836 115.71 1251 200 20 20 L7 27.66018

-97.17836 115.71 1252 80 25 20 L7 27.66018

-97.17836 123.14 1253 95 25 20 L7 27.66018

-97.17836 123.14 1254 110 25 20 L7 27.66018

-97.17836 123.14 1255 125 25 20 L7 27.66018

-97.17836 123.14 1256 140 25 20 L7 27.66018

-97.17836 123.14 1257 155 25 20 L7 27.66018

-97.17836 123.14 1258 170 25 20 L7 27.66018

-97.17836 123.14 1259 185 25 20 L7 27.66018

-97.17836 123.14 1260 200 25 20 L7 27.66018

-97.17836 123.14 1261 80 5

5 L8 27.503425

-97.260625 109.17 1262 95 5

5 L8 27.503425

-97.260625 109.17 1263 110 5

5 L8 27.503425

-97.260625 109.17 1264 125 5

5 L8 27.503425

-97.260625 109.17 1265 140 5

5 L8 27.503425

-97.260625 109.17 1266 155 5

5 L8 27.503425

-97.260625 109.17 1267 170 5

5 L8 27.503425

-97.260625 109.17 1268 185 5

5 L8 27.503425

-97.260625 109.17 1269 200 5

5 L8 27.503425

-97.260625 109.17 2.4.5-69

Long Mott Generating Station Preliminary Safety Analysis Report Table 2.4.5-4 Synthetic Hurricane Parameters (Sheet 48 of 54)

Section 2.4 Hydrology November 2025 Storm ID Bearing

()

Rmax (nm)

T (kt)

Landfall Lat Long P (mb) 1270 80 10 5

L8 27.503425

-97.260625 114.31 1271 95 10 5

L8 27.503425

-97.260625 114.31 1272 110 10 5

L8 27.503425

-97.260625 114.31 1273 125 10 5

L8 27.503425

-97.260625 114.31 1274 140 10 5

L8 27.503425

-97.260625 114.31 1275 155 10 5

L8 27.503425

-97.260625 114.31 1276 170 10 5

L8 27.503425

-97.260625 114.31 1277 185 10 5

L8 27.503425

-97.260625 114.31 1278 200 10 5

L8 27.503425

-97.260625 114.31 1279 80 15 5

L8 27.503425

-97.260625 120.26 1280 95 15 5

L8 27.503425

-97.260625 120.26 1281 110 15 5

L8 27.503425

-97.260625 120.26 1282 125 15 5

L8 27.503425

-97.260625 120.26 1283 140 15 5

L8 27.503425

-97.260625 120.26 1284 155 15 5

L8 27.503425

-97.260625 120.26 1285 170 15 5

L8 27.503425

-97.260625 120.26 1286 185 15 5

L8 27.503425

-97.260625 120.26 1287 200 15 5

L8 27.503425

-97.260625 120.26 1288 80 20 5

L8 27.503425

-97.260625 126.8 1289 95 20 5

L8 27.503425

-97.260625 126.8 1290 110 20 5

L8 27.503425

-97.260625 126.8 1291 125 20 5

L8 27.503425

-97.260625 126.8 1292 140 20 5

L8 27.503425

-97.260625 126.8 1293 155 20 5

L8 27.503425

-97.260625 126.8 1294 170 20 5

L8 27.503425

-97.260625 126.8 1295 185 20 5

L8 27.503425

-97.260625 126.8 1296 200 20 5

L8 27.503425

-97.260625 126.8 2.4.5-70

Long Mott Generating Station Preliminary Safety Analysis Report Table 2.4.5-4 Synthetic Hurricane Parameters (Sheet 49 of 54)

Section 2.4 Hydrology November 2025 Storm ID Bearing

()

Rmax (nm)

T (kt)

Landfall Lat Long P (mb) 1297 80 25 5

L8 27.503425

-97.260625 133.1 1298 95 25 5

L8 27.503425

-97.260625 133.1 1299 110 25 5

L8 27.503425

-97.260625 133.1 1300 125 25 5

L8 27.503425

-97.260625 133.1 1301 140 25 5

L8 27.503425

-97.260625 133.1 1302 155 25 5

L8 27.503425

-97.260625 133.1 1303 170 25 5

L8 27.503425

-97.260625 133.1 1304 185 25 5

L8 27.503425

-97.260625 133.1 1305 200 25 5

L8 27.503425

-97.260625 133.1 1306 80 5

10 L8 27.503425

-97.260625 105.42 1307 95 5

10 L8 27.503425

-97.260625 105.42 1308 110 5

10 L8 27.503425

-97.260625 105.42 1309 125 5

10 L8 27.503425

-97.260625 105.42 1310 140 5

10 L8 27.503425

-97.260625 105.42 1311 155 5

10 L8 27.503425

-97.260625 105.42 1312 170 5

10 L8 27.503425

-97.260625 105.42 1313 185 5

10 L8 27.503425

-97.260625 105.42 1314 200 5

10 L8 27.503425

-97.260625 105.42 1315 80 10 10 L8 27.503425

-97.260625 110.4 1316 95 10 10 L8 27.503425

-97.260625 110.4 1317 110 10 10 L8 27.503425

-97.260625 110.4 1318 125 10 10 L8 27.503425

-97.260625 110.4 1319 140 10 10 L8 27.503425

-97.260625 110.4 1320 155 10 10 L8 27.503425

-97.260625 110.4 1321 170 10 10 L8 27.503425

-97.260625 110.4 1322 185 10 10 L8 27.503425

-97.260625 110.4 1323 200 10 10 L8 27.503425

-97.260625 110.4 2.4.5-71

Long Mott Generating Station Preliminary Safety Analysis Report Table 2.4.5-4 Synthetic Hurricane Parameters (Sheet 50 of 54)

Section 2.4 Hydrology November 2025 Storm ID Bearing

()

Rmax (nm)

T (kt)

Landfall Lat Long P (mb) 1324 80 15 10 L8 27.503425

-97.260625 116.3 1325 95 15 10 L8 27.503425

-97.260625 116.3 1326 110 15 10 L8 27.503425

-97.260625 116.3 1327 125 15 10 L8 27.503425

-97.260625 116.3 1328 140 15 10 L8 27.503425

-97.260625 116.3 1329 155 15 10 L8 27.503425

-97.260625 116.3 1330 170 15 10 L8 27.503425

-97.260625 116.3 1331 185 15 10 L8 27.503425

-97.260625 116.3 1332 200 15 10 L8 27.503425

-97.260625 116.3 1333 80 20 10 L8 27.503425

-97.260625 123.14 1334 95 20 10 L8 27.503425

-97.260625 123.14 1335 110 20 10 L8 27.503425

-97.260625 123.14 1336 125 20 10 L8 27.503425

-97.260625 123.14 1337 140 20 10 L8 27.503425

-97.260625 123.14 1338 155 20 10 L8 27.503425

-97.260625 123.14 1339 170 20 10 L8 27.503425

-97.260625 123.14 1340 185 20 10 L8 27.503425

-97.260625 123.14 1341 200 20 10 L8 27.503425

-97.260625 123.14 1342 80 25 10 L8 27.503425

-97.260625 130.42 1343 95 25 10 L8 27.503425

-97.260625 130.42 1344 110 25 10 L8 27.503425

-97.260625 130.42 1345 125 25 10 L8 27.503425

-97.260625 130.42 1346 140 25 10 L8 27.503425

-97.260625 130.42 1347 155 25 10 L8 27.503425

-97.260625 130.42 1348 170 25 10 L8 27.503425

-97.260625 130.42 1349 185 25 10 L8 27.503425

-97.260625 130.42 1350 200 25 10 L8 27.503425

-97.260625 130.42 2.4.5-72

Long Mott Generating Station Preliminary Safety Analysis Report Table 2.4.5-4 Synthetic Hurricane Parameters (Sheet 51 of 54)

Section 2.4 Hydrology November 2025 Storm ID Bearing

()

Rmax (nm)

T (kt)

Landfall Lat Long P (mb) 1351 80 5

15 L8 27.503425

-97.260625 101.74 1352 95 5

15 L8 27.503425

-97.260625 101.74 1353 110 5

15 L8 27.503425

-97.260625 101.74 1354 125 5

15 L8 27.503425

-97.260625 101.74 1355 140 5

15 L8 27.503425

-97.260625 101.74 1356 155 5

15 L8 27.503425

-97.260625 101.74 1357 170 5

15 L8 27.503425

-97.260625 101.74 1358 185 5

15 L8 27.503425

-97.260625 101.74 1359 200 5

15 L8 27.503425

-97.260625 101.74 1360 80 10 15 L8 27.503425

-97.260625 106.64 1361 95 10 15 L8 27.503425

-97.260625 106.64 1362 110 10 15 L8 27.503425

-97.260625 106.64 1363 125 10 15 L8 27.503425

-97.260625 106.64 1364 140 10 15 L8 27.503425

-97.260625 106.64 1365 155 10 15 L8 27.503425

-97.260625 106.64 1366 170 10 15 L8 27.503425

-97.260625 106.64 1367 185 10 15 L8 27.503425

-97.260625 106.64 1368 200 10 15 L8 27.503425

-97.260625 106.64 1369 80 15 15 L8 27.503425

-97.260625 112.59 1370 95 15 15 L8 27.503425

-97.260625 112.59 1371 110 15 15 L8 27.503425

-97.260625 112.59 1372 125 15 15 L8 27.503425

-97.260625 112.59 1373 140 15 15 L8 27.503425

-97.260625 112.59 1374 155 15 15 L8 27.503425

-97.260625 112.59 1375 170 15 15 L8 27.503425

-97.260625 112.59 1376 185 15 15 L8 27.503425

-97.260625 112.59 1377 200 15 15 L8 27.503425

-97.260625 112.59 2.4.5-73

Long Mott Generating Station Preliminary Safety Analysis Report Table 2.4.5-4 Synthetic Hurricane Parameters (Sheet 52 of 54)

Section 2.4 Hydrology November 2025 Storm ID Bearing

()

Rmax (nm)

T (kt)

Landfall Lat Long P (mb) 1378 80 20 15 L8 27.503425

-97.260625 119.42 1379 95 20 15 L8 27.503425

-97.260625 119.42 1380 110 20 15 L8 27.503425

-97.260625 119.42 1381 125 20 15 L8 27.503425

-97.260625 119.42 1382 140 20 15 L8 27.503425

-97.260625 119.42 1383 155 20 15 L8 27.503425

-97.260625 119.42 1384 170 20 15 L8 27.503425

-97.260625 119.42 1385 185 20 15 L8 27.503425

-97.260625 119.42 1386 200 20 15 L8 27.503425

-97.260625 119.42 1387 80 25 15 L8 27.503425

-97.260625 126.8 1388 95 25 15 L8 27.503425

-97.260625 126.8 1389 110 25 15 L8 27.503425

-97.260625 126.8 1390 125 25 15 L8 27.503425

-97.260625 126.8 1391 140 25 15 L8 27.503425

-97.260625 126.8 1392 155 25 15 L8 27.503425

-97.260625 126.8 1393 170 25 15 L8 27.503425

-97.260625 126.8 1394 185 25 15 L8 27.503425

-97.260625 126.8 1395 200 25 15 L8 27.503425

-97.260625 126.8 1396 80 5

20 L8 27.503425

-97.260625 100 1397 95 5

20 L8 27.503425

-97.260625 100 1398 110 5

20 L8 27.503425

-97.260625 100 1399 125 5

20 L8 27.503425

-97.260625 100 1400 140 5

20 L8 27.503425

-97.260625 100 1401 155 5

20 L8 27.503425

-97.260625 100 1402 170 5

20 L8 27.503425

-97.260625 100 1403 185 5

20 L8 27.503425

-97.260625 100 1404 200 5

20 L8 27.503425

-97.260625 100 2.4.5-74

Long Mott Generating Station Preliminary Safety Analysis Report Table 2.4.5-4 Synthetic Hurricane Parameters (Sheet 53 of 54)

Section 2.4 Hydrology November 2025 Storm ID Bearing

()

Rmax (nm)

T (kt)

Landfall Lat Long P (mb) 1405 80 10 20 L8 27.503425

-97.260625 103.07 1406 95 10 20 L8 27.503425

-97.260625 103.07 1407 110 10 20 L8 27.503425

-97.260625 103.07 1408 125 10 20 L8 27.503425

-97.260625 103.07 1409 140 10 20 L8 27.503425

-97.260625 103.07 1410 155 10 20 L8 27.503425

-97.260625 103.07 1411 170 10 20 L8 27.503425

-97.260625 103.07 1412 185 10 20 L8 27.503425

-97.260625 103.07 1413 200 10 20 L8 27.503425

-97.260625 103.07 1414 80 15 20 L8 27.503425

-97.260625 108.87 1415 95 15 20 L8 27.503425

-97.260625 108.87 1416 110 15 20 L8 27.503425

-97.260625 108.87 1417 125 15 20 L8 27.503425

-97.260625 108.87 1418 140 15 20 L8 27.503425

-97.260625 108.87 1419 155 15 20 L8 27.503425

-97.260625 108.87 1420 170 15 20 L8 27.503425

-97.260625 108.87 1421 185 15 20 L8 27.503425

-97.260625 108.87 1422 200 15 20 L8 27.503425

-97.260625 108.87 1423 80 20 20 L8 27.503425

-97.260625 115.71 1424 95 20 20 L8 27.503425

-97.260625 115.71 1425 110 20 20 L8 27.503425

-97.260625 115.71 1426 125 20 20 L8 27.503425

-97.260625 115.71 1427 140 20 20 L8 27.503425

-97.260625 115.71 1428 155 20 20 L8 27.503425

-97.260625 115.71 1429 170 20 20 L8 27.503425

-97.260625 115.71 1430 185 20 20 L8 27.503425

-97.260625 115.71 1431 200 20 20 L8 27.503425

-97.260625 115.71 2.4.5-75

Long Mott Generating Station Preliminary Safety Analysis Report Table 2.4.5-4 Synthetic Hurricane Parameters (Sheet 54 of 54)

Section 2.4 Hydrology November 2025 Storm ID Bearing

()

Rmax (nm)

T (kt)

Landfall Lat Long P (mb) 1432 80 25 20 L8 27.503425

-97.260625 123.14 1433 95 25 20 L8 27.503425

-97.260625 123.14 1434 110 25 20 L8 27.503425

-97.260625 123.14 1435 125 25 20 L8 27.503425

-97.260625 123.14 1436 140 25 20 L8 27.503425

-97.260625 123.14 1437 155 25 20 L8 27.503425

-97.260625 123.14 1438 170 25 20 L8 27.503425

-97.260625 123.14 1439 185 25 20 L8 27.503425

-97.260625 123.14 1440 200 25 20 L8 27.503425

-97.260625 123.14 2.4.5-76

Long Mott Generating Station Preliminary Safety Analysis Report Section 2.4 Hydrology 2.4.5-77 November 2025 Table 2.4.5-5 SLOSH Grid Cell Indices, Latitude, and Longitude of Locations Selected for Model Validation, Verification, and Analysis Location SLOSH Grid Cell Latitude (deg. N)

Longitude (deg. W)

Long Mott Site (89,28) 28.5278 96.7611 Seadrift, TX (NOAA ID 8773037)

(99,38) 28.3997 96.7218 Port O'Connor, TX (NOAA ID 8773701)

(85,68) 28.4525 96.3868 Port Lavaca, TX (NOAA ID 8773259)

(66,37) 28.6427 96.5951 Aransas Wildlife Refuge (NOAA ID 8774230)

(116,39) 28.2218 96.8043 Rockport, TX (NOAA ID 8774770)

(135,33) 28.0194 97.0338

Long Mott Generating Station Preliminary Safety Analysis Report

Section 2.4 Hydrology 2.4.5-78 November 2025 Table 2.4.5-6 Modeled (SLOSH) and Observed (NOAA) Maximum Total Water Elevation and Time of Maximum Total Water Elevation for Hurricane Harvey Location SLOSH Observed Maximum Total Water Elevation (ft. NAVD88)

Time (UTC)

Maximum Total Water Elevation (ft. NAVD88)

Time (UTC)

Seadrift, TX 4.58 26-Aug-2017 07:42:00 5.76 26-Aug-2017 11:24:00 Port O'Connor, TX 3.50 25-Aug-2017 23:54:00 3.24 26-Aug-2017 01:48:00 Port Lavaca, TX 5.90 26-Aug-2017 04:24:00 7.19 26-Aug-2017 08:42:00 Aransas Wildlife Refuge, TX 5.50 26-Aug-2017 02:54:00 5.05 26-Aug-2017 02:12:00 Rockport, TX 4.00 26-Aug-2017 02:00:00 Failed(a)

Failed (a) The tide gauge at Rockport stopped collecting data during Hurricane Harvey; therefore, maximum total water elevation observations are not available for this location.

Long Mott Generating Station Preliminary Safety Analysis Report

Section 2.4 Hydrology 2.4.5-79 November 2025 Table 2.4.5-7 SLOSH-Modeled Maximum Total Water Elevation versus Observations for Hurricane Carla Location SLOSH Maximum Total Water Elevation (ft. NAVD88)

Observed Maximum Total Water Elevation (ft. NAVD88)

Seadrift, TX 6.0 10.8 Port O'Connor, TX 9.3 12.3 Port Lavaca, TX 19.0 22.0 Aransas Wildlife Refuge, TX 4.8 6.3 Rockport, TX 1.0 Not reported

Long Mott Generating Station Preliminary Safety Analysis Report Section 2.4 Hydrology 2.4.5-80 November 2025 Table 2.4.5-8 Storms Selected for Detailed ADCIRC+SWAN Modeling ID STORM ID Maximum Total Water Elevation (ft. NAVD88)(a)

Inundation Depth (ft.) (b)

COL A COL B COL C COL D 1

671 41.47 10.47 2

492 39.93 8.93 3

670 39.38 8.38 4

537 38.94 7.94 5

436 38.50 7.5 6

311 38.06 7.06 7

310 37.62 6.62 8

312 37.18 6.18 9

390 36.74 5.74 10 193 36.30 5.3 11 195 35.86 4.86 12 260 35.42 4.42 13 300 34.98 3.98 14 30 34.54 3.54 15 84 34.10 3.1 a) increased by 10% for SLOSH uncertainty.

b)

COL D = COL C - 31 ft., where 31 ft is nuclear island finish grade

Long Mott Generating Station Preliminary Safety Analysis Report Section 2.4 Hydrology 2.4.5-81 November 2025 Table 2.4.5-9 Maximum Values of ADCIRC+SWAN Production Runs at LMGS Site Storm ID(#)

Water Surface Elevation (m NAVDBB)

Wind Speed (mis)

Sig. Wave Height(m)

Wave Direction (deg N, from)

Peak Wave Period (s) 260 11.09 83.8 1.23 41 2.8 492 9.61 81.8 0.75 286 2.7 671 9.56 71.2 0.66 287 2.2 436 8.99 77.4 0.43 335 1.6 670 8.73 74.8 0.26 318 1.4 84 8.47 77.5 0.23 311 1.6 390 8.37 79.8 0.21 27 2.9 195 8.35 74.2 0.18 36 2.2 312 8.33 72.6 0.14 325 1.1 30 8.33 78.8 0.17 32 3.2 300 8.31 80.7 0.12 306 1.1 310 8.30 76.8 0.16 287 7.3 311 8.29 75.3 0.15 271 2.3 537 8.24 71.8 0.11 263 4.8 193 0.00 65.9 0.00 N/A N/A

Long Mott Generating Station Preliminary Safety Analysis Report Section 2.4 Hydrology 2.4.5-82 November 2025 Figure 2.4.5-1 Long Mott Generating Station Site Location and NOAA Tide Gauge Locations

Long Mott Generating Station Preliminary Safety Analysis Report Section 2.4 Hydrology 2.4.5-83 November 2025 Figure 2.4.5-2 Historical Hurricane Tracks Intersecting the Study Area (200 Km Radius from Seadrift, TX)

Long Mott Generating Station Preliminary Safety Analysis Report Section 2.4 Hydrology 2.4.5-84 November 2025 Figure 2.4.5-3 Distribution of Hurricane Central Pressure at Landfall for Hurricanes that Made Landfall on the Texas Gulf Coast

Long Mott Generating Station Preliminary Safety Analysis Report Section 2.4 Hydrology 2.4.5-85 November 2025 Figure 2.4.5-3 Distribution of Hurricane Central Pressure at Landfall for Hurricanes that Made Landfall on the Texas Gulf Coast Source: Blake et al., 2011, and NOAA, 2024a

Long Mott Generating Station Preliminary Safety Analysis Report Section 2.4 Hydrology 2.4.5-86 November 2025 Figure 2.4.5-4 Alignment of Synthetic Storm Tracks

Long Mott Generating Station Preliminary Safety Analysis Report Section 2.4 Hydrology 2.4.5-87 November 2025 Figure 2.4.5-5 Hypothetical Landfall Locations

Long Mott Generating Station Preliminary Safety Analysis Report Section 2.4 Hydrology 2.4.5-88 November 2025 Figure 2.4.5-6 Matagorda Bay (2007) Basin with Long Mott Generating Station Site Identified as Dry

Long Mott Generating Station Preliminary Safety Analysis Report Section 2.4 Hydrology 2.4.5-89 November 2025 Figure 2.4.5-7 Storm Tracks for Hurricanes Harvey (2017) and Carla (1961)

Long Mott Generating Station Preliminary Safety Analysis Report Section 2.4 Hydrology 2.4.5-90 November 2025 Figure 2.4.5-8 Modeled (SLOSH) and Observed (NOAA) Total Water Elevation at Seadrift, Texas for Hurricane Harvey

Long Mott Generating Station Preliminary Safety Analysis Report Section 2.4 Hydrology 2.4.5-91 November 2025 Figure 2.4.5-9 Modeled (SLOSH) and Observed (NOAA) Total Water Elevation at Port OConnor, Texas for Hurricane Harvey

Long Mott Generating Station Preliminary Safety Analysis Report Section 2.4 Hydrology 2.4.5-92 November 2025 Figure 2.4.5-10 Modeled (SLOSH) and Observed (NOAA) Total Water Elevation at Port Lavaca, Texas for Hurricane Harvey

Long Mott Generating Station Preliminary Safety Analysis Report Section 2.4 Hydrology 2.4.5-93 November 2025 Figure 2.4.5-11 Modeled (SLOSH) and Observed (NOAA) Total Water Elevation at Aransas Wildlife Refuge, Texas for Hurricane Harvey

Long Mott Generating Station Preliminary Safety Analysis Report Section 2.4 Hydrology 2.4.5-94 November 2025 Figure 2.4.5-12 Modeled (SLOSH) and Observed (NOAA) Total Water Elevation at Rockport, Texas for Hurricane Harvey

Long Mott Generating Station Preliminary Safety Analysis Report Section 2.4 Hydrology 2.4.5-95 November 2025 Figure 2.4.5-13 SLOSH Maximum Surge from Hurricane Carla Compared to Historical Observations

Long Mott Generating Station Preliminary Safety Analysis Report Section 2.4 Hydrology 2.4.5-96 November 2025 Figure 2.4.5-14 Hurricane Carla (1961) SLOSH-Modeled Total Water Elevation (in Ft. NAVD 88) at Seadrift, Port OConnor, Port Lavaca, Aransas Wildlife Refuge, and Rockport

Long Mott Generating Station Preliminary Safety Analysis Report Section 2.4 Hydrology 2.4.5-97 November 2025 Figure 2.4.5-15 SLOSH-Modeled Maximum Total Water Elevation for All 1440 Production Runs (Variable Central Pressure Difference Case)

Long Mott Generating Station Preliminary Safety Analysis Report Section 2.4 Hydrology 2.4.5-98 November 2025 Figure 2.4.5-16 Full Domain Grid Spacing of the NOAA HSOFS Grid

Long Mott Generating Station Preliminary Safety Analysis Report Section 2.4 Hydrology 2.4.5-99 November 2025 Figure 2.4.5-17 Grid Spacing of HSOFS Grid in Matagorda Bay and San Antonio Bay Area

Long Mott Generating Station Preliminary Safety Analysis Report Section 2.4 Hydrology 2.4.5-100 November 2025 Figure 2.4.5-18 Bathymetry and Topography of Improved HSOFS Grid in the Area of Increased Resolution

Long Mott Generating Station Preliminary Safety Analysis Report Section 2.4 Hydrology 2.4.5-101 November 2025 Figure 2.4.5-19 Detail of Topography of Improved HSOFS Grid in the Area of Increased Resolution

Long Mott Generating Station Preliminary Safety Analysis Report Section 2.4 Hydrology 2.4.5-102 November 2025 Figure 2.4.5-20 Hurricane Harvey Track and Location of Validation Sites (Triangles for Water Level and Squares for Waves)

Long Mott Generating Station Preliminary Safety Analysis Report Section 2.4 Hydrology 2.4.5-103 November 2025 Figure 2.4.5-21 Comparison of Storm Surge Model Results with Observations at Seadrift and Port OConnor Due to Hurricane Harvey

Long Mott Generating Station Preliminary Safety Analysis Report Section 2.4 Hydrology 2.4.5-104 November 2025 Figure 2.4.5-22 Comparison of Significant Wave Height Model Result and Observations at NDBC Stations 42020 and 42019 Due to Hurricane Harvey

Long Mott Generating Station Preliminary Safety Analysis Report Section 2.4 Hydrology 2.4.5-105 November 2025 Figure 2.4.5-23 Hurricane Nicholas Track and Location of Validation Sites (Triangles for Water Level and Squares for Waves)

Long Mott Generating Station Preliminary Safety Analysis Report Section 2.4 Hydrology 2.4.5-106 November 2025 Figure 2.4.5-24 Comparison of Storm Surge Model Results and Observations at Port OConnor and Port Lavaca for Hurricane Nicholas

Long Mott Generating Station Preliminary Safety Analysis Report Section 2.4 Hydrology 2.4.5-107 November 2025 Figure 2.4.5-25 Comparison of Significant Wave Height Model Results and Observations at NDBC Stations 42020 and 42019 for Hurricane Nicholas

Long Mott Generating Station Preliminary Safety Analysis Report Section 2.4 Hydrology 2.4.5-108 November 2025 Figure 2.4.5-26 ADCIRC+SWAN Predicted Time Series of Water Surface Elevation, Significant Wave Height, Wind Speed, and Current Speed at LMGS for Storm 260

Long Mott Generating Station Preliminary Safety Analysis Report Section 2.4 Hydrology 2.4.5-109 November 2025 Figure 2.4.5-27 Hydrostatic and Hydrodynamic Forces on Safety-Related Structures