Appendix A - Depiction of the Property and Existing Encumbrances (Revision 1).pdf

Peace Through Atomic Strength

Appendix A: Depiction of the Property and Existing Encumbrances (Revision 1)

AI Data Centers with Onsite Power Generation

Text Revisions shown in Blue Font

Summary of Potentially Available Land NNSA has identified 10 tracts of land that may be capable of supporting a data center and/or power generation only

The total land area identified is 3,103 acres

Tract size ranges from 81 acres (Site 8) to 570 acres (Site 9)

Offerors may propose to lease all of a tract or only a portion of a tract

Offerors may propose to lease all or a portion of multiple tracts

NNSA does not anticipate leasing more than about 15% of the total acreage (i.e., 450± acres) as a result of this RFP

SRS Power Grid The DOE owned SRS transmission and distribution grid is powered by three 115 kV lines

• Two originate at the Dominion Energy Urquhart Combined Cycle Plant

• One originates at the utility owned substation located within the SRS boundary on the 230 kV line passing through the site

• Line capacities shown in aqua font in picture to the right

One utility owned 115 kV line between Urquhart and Fairfax passes through the site

A 20 MW DOE owned biomass combined cycle plant will operate at least through 2031 and produces between 70,000 MWh and 95,000 MWh annually

Two commercially owned 75 MW solar power generation facilities with BESS are in development and will be located on land leased from DOE

• Commercial operations scheduled for late 2029

• 25-year lease with two 5-year options begins upon start of commercial operations

• Each site should produce ~125,000 MWh annually 36

River Water System One Operational Pumphouse remaining is located on the Savannah River (Circa 1953)

• Two – 7,500 gpm pumps (normally 1 in operation)

• Four – 32,000 gpm pumps available

• ~ 43 miles of underground piping remains in service

• Piping size ranges from 54” to 84” diameter

• 6” thick concrete with steel reinforcement

• Maximum system pressure at the pumphouse is 180 psig

• Minimum system pressure at the pumphouse is 160 psig

SCDES Withdrawal Permit

• Allows withdrawal of approximately 250,000 GPM from each of the two existing pumphouses.

• SRS currently withdraws ~7,500 GPM from one pumphouse.

• Second pumphouse is non-operational and will require refurbishment

• Permit requires return of a large percentage of the water to the river

SMR Siting Analysis – Savannah River National Lab

In 2011, The Savannah River National Lab conducted a holistic analysis to determine the optimum locations for a small modular reactor at SRS and generated a report entitled: Proposed Site Selection for Small Modular Reactor, SRNL-L4300-2011-00011

The analysis was based on a well-known SMR design at the time and included a map of SRS indicating the suitability of various locations for installation of a small modular reactor

The graphic to the right shows approximately where each of the 10 potential sites (light blue polygons) identified in the RFP are located relative to the results of the SRNL analysis

Higher Site Selection Modeling System (SSMS) scores, indicate more favorable siting conditions

This report can be downloaded from the SAM.gov listing for

SRS RFP

NOTE: In addition to SRNL identifying these locations in 2011, numerous assumptions were required to develop the analysis model. The results of the study must only be used as a starting point for the offeror’s own analysis. DOE, NNSA nor SRNL warrant the accuracy or suitability of this analysis for any purpose.

Site 1

Area: 236 acres

Perimeter: 13,116 ft

Elevation:

• Minimum: 264 ft

• Median: 334 ft

• Maximum: 382 ft

Site 1

Site 2

Area: 461 acres

Perimeter: 19,711 ft

Elevation:

• Minimum: 181 ft

• Median: 219 ft

• Maximum: 336 ft

Site 2

Site 3

Area: 384 acres

Perimeter: 18,748 ft

Elevation:

• Minimum: 199 ft

• Median: 271 ft

• Maximum: 338 ft

Site 3

Site 4

Area: 316 acres

Perimeter: 15,380 ft

Elevation:

• Minimum: 225 ft

• Median: 280 ft

• Maximum: 341 ft

Site 4

Site 5

Area: 345 acres

Perimeter: 15,549 ft

Elevation:

• Minimum: 254 ft

• Median: 308 ft

• Maximum: 373 ft

Site 5

Site 6

Area: 168 acres

Perimeter: 11,228 ft

Elevation:

• Minimum:277 ft

• Median: 348 ft

• Maximum: 391 ft

Site 7

Area: 121 acres

Perimeter: 10,133 ft

Elevation:

• Minimum:323 ft

• Median: 378 ft

• Maximum: 427 ft

Site 8

Area: 81 acres

Perimeter: 8,129 ft

Elevation:

• Minimum:317 ft

• Median: 335 ft

• Maximum: 359 ft

Sites 6, 7 and 8

Site 9

Area: 570 acres

Perimeter: 22,258 ft

Elevation:

• Minimum: 190 ft

• Median: 270 ft

• Maximum: 391 ft

Site 9

Site 10

Area: 421 acres

Perimeter: 20,067 ft

Elevation:

• Minimum: 268 ft

• Median: 356 ft

• Maximum: 424 ft

Site 10

Long Haul Fiber Optic Lines

The long-haul fiber optic lines supporting internet traffic generally follow the two major highways, US-278 and SC Hwy

Map shows only approximate locations

Soil Conditions

PIT-MISC-0104 - Soil Survey of Savannah River Plant Area, Parts of Aiken, Barnwell, and Allendale Counties in South Carolina.

https://www.nrc.gov/docs/ML1016 /ML101600002.pdf

Subsurface Conditions

SRNL-TR-2012-00160, A

Review of Subsurface Soft Zones at SRS with Emphasis on H Area Tank Farm, Rev. 0.

https://www.nrc.gov/docs/ML1308 /ML13080A339.pdf

Seismic Risk Analysis

Comprehensive Seismic Risk and Vulnerability Study for the State of South Carolina https://www.scemd.org/media/1141/ eq_study.pdf

Geologic Hazards

Geologic Hazards of the South Carolina Coastal Plain https://www.dnr.sc.gov/geology/pdfs/GGMS5.pdf https://www.dnr.sc.gov/geology/pdfs/GGMS_Web_Pamphlet.pdf

Fault Structure

Comparison of Cenozoic Faulting at the Savannah River Site to Fault Characteristics of the Atlantic Coast Fault Province: Implications for Fault Capability, WSRC-TR-2000- 00310.

https://www.nrc.gov/docs/ ML1028/ML102850341.pdf

Earthquake Risk

Recent Earthquakes -

SCDNR

https://www.dnr.sc.gov/geology /recent-earthquakes.html

Geology / Hydrogeology

SRS

Geology/Hydrogeology Environmental Information https://www.osti.gov/servlets/purl/proofs /elsevier/GCA/10526/images/mmc1.pdf

Ground Water – Floridian Aquifers

Report_67_Potentiometric_Surface_ of_the_Upper_and_Middle_Floridan_ Aquifers_in_South _Carolina_November- December_2021 https://des.sc.gov/sites/des/files/DNR/Hydrolog y/pdfs/reports/Report_67_Upper-Middle- Floridan_2021.pdf

Ground Water – Crouch Branch

Report_66_Crouch_Branc h_Potentiometric_Map_20 https://des.sc.gov/sites/des/files/DNR/Hydrolog y/pdfs/reports/Report_66_Crouch_Branch_Pote ntiometric_Map_2020.pdf

Ground Water – Gordon Aquifer

Report_68_Potentiometric_Surface_of _the_Gordon_Aquifer_in_South_Caroli na_November-December_2021 https://des.sc.gov/sites/des/files/DNR/Hydrolo gy/pdfs/reports/SCDNR_68_Gordon_2021.pdf

Ground Water – McQueen Branch

Report_69_McQueen_Branch_and_Charlest on_Potentiometric_Map_2022 https://des.sc.gov/sites/des/files/DNR/Hydrolo gy/pdfs/reports/SCDNR_69_McQueen_Branch_ Charleston_2022.pdf

Savannah River Flow & Temperature

Source: USGS

USGS Station: #021973269

Based on 19 years of data

Discharge, cubic feet per second

4250 ft3/s Low

4770 ft3/s 25th percentile

6520 ft3/s Median

7530 ft3/s 75th percentile

7192 ft3/s Mean

16800 ft3/s High

Existing Chemical Plumes https://trac.pnnl.gov/

Archeological Inventory

The Preliminary Archeological Inventory of the Savannah River Plant, Aiken and Barnwell Counties, South Carolina

(Approximate location of available sites shown in blue) https://scholarcommons.sc.edu /cgi/viewcontent.cgi?article=114 6&context=archanth_books

Environmental Summary

Savannah River Site Environmental Report Summary https://www.srs.gov/general/pubs/ERsu m/er23/docs/SRNS-RP-2024-00004.pdf

Environmental Summary (Continued)

SRS ECOLOGY

ENVIRONMENTA

L INFORMATION

DOCUMENT

https://sti.srs.gov/fulltext/ WSRC-TR-2005-00201.pdf

Climate / Weather

South Carolina DNR Climate Overview https://www.dnr.sc.gov/climate/sco/Publicatio ns/SCClimateOverview.pdf

SC Comprehensive Hurricane Summary https://www.dnr.sc.gov/climate/sco/hurrican es/pdfs/SCHurricanesExecutiveSummary.pdf