ML21286A282

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Amendment 29 to Updated Final Safety Analysis Report, Chapter 2, Table 2.4A, Maximum Possible Flood
ML21286A282
Person / Time
Site: Browns Ferry  Tennessee Valley Authority icon.png
Issue date: 10/04/2021
From:
Tennessee Valley Authority
To:
Office of Nuclear Reactor Regulation
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ML21286A574 List: ... further results
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Download: ML21286A282 (7)
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BFN-25

Table 1 (Sheet 2 of 2)

FACTS ABOUT TVA DAMS AND RESERVOIRS

a) All in the Tennessee Valley, except for Great Falls which is in the Cumberland Valley.

b) Cost of plant including the inception balance of the plant and all additions and retirements from the plant. Transmission assets are not included.

c) Winter net dependable capacity as of October 2009. Winter net dependable capacity is the amount of power a plant can produce on an average winter day, minus the electricity used by the plant itself.

d) E: Earth; R: Rock fill; G: Gravity; C: Concrete; O: Other (Codes for each dam are listed in order of importance.)

e) At June 1 flood guide elevation.

f) Volume between the January 1 elevation and top of gates.

g) Connected to Barkley Reservoir by 1-1/2 mile canal, which opened July 14, 1966.

h) Acquired: Wilson by transfer from the U.S. Army Corps of Engineers in 1933; Ocoee 1, Ocoee 2, Blue Ridge, and Great Falls by purchase from Tennessee Electric Power Company in 1939; Wilbur and Nolichucky (retired) by purchase from East Tennessee Power and Light Company in 1945.

Subsequent to acquisition, TVA installed additional units at Wilson and Wilbur. Reconstructed flume at Ocoee 2 was placed in service in November 1983.

i) Main locks placed in operation in 1959 at Wilson, 1963 at Wheeler, 1965 at Guntersville, and 1984 at Pickwick Landing.

j) Construction of main lock at Nickajack limited to underwater construction.

k) Generating units at Raccoon Mountain are reversible Francis type pump-turbine units, each with 428,400 kW generator rating and 612,000 hp pump motor rating.

l) Unit 2 at Hiwassee is a reversible Francis type pump-turbine unit with 95,000 kW generator rating and 121,530 hp pump motor rating at 200 ft. net head.

m) Ocoee 1 creates Parksville Reservoir, Nolichucky (retired) creates Davy Crockett Reservoir, and Blue Ridge creates Toccoa Reservoir.

n) Construction of Blue Ridge discontinued early in 1926; resumed in March 1929.

o) Tellico project has no lock or powerhouse. Streamflow through navigable canal to Fort Loudoun Reservoir permits navigation and increases average annual energy output at Fort Loudoun.

p) Initial construction of South Holston and Watauga started February 16, 1942; temporarily discontinued to conserve critical materials during WWII.

q) Generating units at Nolichucky were removed from system generating capacity in August 1972. The dam was renovated and modified to convert the reservoir for use as a wildlife preserve.

r) Includes 72.4 miles up the Tennessee River to Fort Loudoun Dam and 23.1 miles up Clinch River to Melton Hill Dam.

s) Includes 6.5 miles up the French Broad River and 4.4 miles up the Holston River.

t) Includes 17.4 miles up the South Fork Holston River and 15.3 miles up the Watauga River.

u) Includes 73 miles up the Clinch River and 56 miles up the Powell River.

v) The U.S. Army Corps of Engineers is increasing the size of lock structures at Kentucky and Chickamauga.

w) The structural height of the dam is the vertical distance from the lowest point of the excavated foundation to the top of the dam. Top of dam refers to the highest point of the water barrier on an embankment (or top of parapet wall) and deck elevation (or top of parapet wall) for concrete structures.

x) As an interim measure to prevent overtopping, these four dams were raised by HESCO Concertainer floodline units.

Watts Bar - 3 feet: embankment at elevation 767 raised to elevation 770.

Fort Loudoun - 3.75 feet: embankment at elevation 830 was raised 7 feet to elevation 837 (3.75 feet above top of concrete wall at elevation 833.25).

Tellico - 4 feet: embankment at elevation 830 raised to elevation 834.

Cherokee - 3 feet: embankment at elevation 1089 raised to elevation 1092.

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Table 2 (Sheet1of2)

UNIT HYDROGRAPH DATA

GIS Unit Area Drainage Area Duration Number Name (sq.mi.) (hrs.) QP CP TP W50 W75 TB 1 Asheville 944.4 6 14,000 0.21 12 39 15 168 2 Newport, French Broad 913.1 6 43,114 0.66 12 10 4 48 3 Newport, Pigeon 667.1 6 30,910 0.65 12 8 4 90 4 Embreeville 804.8 4 33,275 0.65 12 10 7 80 5 Nolichucky Local 378.7 6 11,740 0.44 12 14 6 90 6 Douglas Local 835 6 47,207 0.27 6 8 5 60 7 Little Pigeon River 352.1 4 17,000 0.75 12 10 6 66 8 French Broad Local 206.5 6 8,600 0.2 6 13 6 60 9 South Holston 703.2 6 15,958 0.53 18 25 17 96 10 Watauga 468.2 4 37,002 0.74 8 6 3 32 11 Boone Local 667.7 6 22,812 0.16 6 13 7 90 12 Fort Patrick Henry 62.8 6 2,550 0.19 6 12 7 66 13 Gate City 668.9 6 11,363 0.56 24 34 26 108 14&15 Total Cherokee Local 854.6 6 25,387 0.42 12 20 10 54 16 Holston River Local 289.6 6 8,400 0.27 9 18 12 96 17 Little River 378.6 4 11,726 0.68 16 15 7 96 18 Fort Loudoun Local 323.4 6 20,000 0.29 6 10 5 36 19 Needmore 436.5 6 9,130 0.49 18 22 12 126 20 Nantahala 90.9 2 3,130 0.38 8 16 11 54 21 Bryson City 653.8 6 26,000 0.43 10 13 7 60 22 Fontana Local 389.8 4 17,931 0.14 4 14 7 28 23 Little Tennessee Local Fontana to Chilhowee Dam 404.7 6 16,613 0.58 12 10 4 84 24 Little Tennessee Local Chilhowee to Tellico Dam 650.2 6 22,600 0.49 12 15 8 54 25 Watts Bar Local above Clinch River 295.3 6 11,063 0.18 6 10 4 90 26 Norris Dam 2912.8 6 43,773 0.07 6 18 6 102 27 Melton Hill Local 431.9 6 12,530 0.14 6 19 10 90 33 Localabove mil16 37.2 2 4,490 0.94 6 3 2 48 34 Poplar Creek 135.2 2 2,800 0.61 20 26 13 90 35 Emory River 868.8 4 36,090 0.39 8 11 6 84 36 Local Area at Mouth 29.3 2 3,703 0.99 6 3 2 48 37 Watts Bar Local below Clinch River 408.4 6 16,125 0.19 6 10 4 90 38 Chatuge 189.1 1 19,062 0.24 2 3 2 37 39 Nottely 214.3 1 44,477 0.16 1 1 1 12 40 Hiwassee Local 565.1 6 23,349 0.58 12 11 6 96 41 Apalachia 49.8 1 5,563 0.26 2 4 1 23 42 Blue Ridge 231.6 2 11,902 0.4 6 10 7 60 43 OcoeeNo.1 Local 362.6 6 17,517 0.23 6 12 8 36 44A Hiwassee at Charleston 686.6 6 9,600 0.59 30 39 23 108 44B Hiwassee at Mouth 396 6 16,870 1 18 11 6 78 45 Chickamauga Local 792.1 6 32,000 0.38 9 14 7 36 46 South Chickamauga Creek 428.1 6 6,267 0.48 24 39 18 132 47A Nickajack Local 545.7 6 9,059 0.16 9 35 8 144 47B North Chickamauga Creek Local 98.3 4 3,000 0.67 16 15 6 112 BFN25

Table 2 (Sheet2of2)

UNIT HYDROGRAPH DATA

GIS Unit Area Drainage Area Duration Number Name (sq.mi.) (hrs.) QP CP TP W50 W75 TB 48 Sequatchie 400 4 8,562 0.47 16 16 7 140 49 Guntersville North Local 1027.1 6 22,089 0.4 15 20 11 138 50 Guntersville South Local 1068.9 6 22,963 0.4 15 19 11 132 51 Paint Rock River near Woodvi lle 321.1 6 11,363 1.00 18 10 5 102 52 Paint Rock Local 138.1 6 6,103 1.24 18 10 5 72 53 Flint River near Chase 343.1 6 16,356 0.89 12 12 8 60 54 Flint River Local 224.8 6 7,962 1.33 24 15 7 78 55 Cotaco Creek at Florette 136.2 6 3,174 0.66 18 21 11 96 56 Cotaco Creek Local 101.1 6 2,644 0.98 24 19 9 84 57 Limestone Creek near Athens 121.3 4 10,618 1.64 12 5 3 40 58 Limestone Creek Local 157.4 6 6,407 0.76 12 12 6 54 59 Tims Ford Dam 533.2 6 17,555 0.31 6 16 6 78 60 ElkRiverLocal, TimsFordtoF ayetteville 293.3 6 7,044 0.68 18 24 14 78 61 Elk River Local, Fayetteville to Prospect 490.2 6 8,874 0.85 30 29 16 102 62 Richland Creek at Mouth 488.0 6 11,529 1.11 30 23 15 90 63 Sugar Creek at Mouth 177.0 4 8,512 1.20 16 16 9 92 64 ElkRiverLocal, Mile16.5toProspect Gage 145.1 6 5,913 1.53 24 12 6 72 65 WheelerLocal 1380.0 6 46,747 0.64 12 16 9 78

Definition of Symbols QP =Peakdischargeincfs.

CP =Snydercoefficient.

TP =Timeinhoursfrombeginningofprecipitationexcesstopeakofunithydrograph.

W50 = Width in hours at 50 percent of peak discharge.

W75 = Width in hours at 75 percent of peak discharge.

TB =Baselengthinhoursofunithydrograph.

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Table 3 (Sheet 1 of 2)

PROBABLE MAXIMUM FLOOD RAINFALL AND PRECIPITATION EXCESS

Antecedent Storm Main Storm Index Rainfall Runoff Rainfall Runoff No. Sub-basin Name (inches) (inches) (inches) (inches) 1 French Broad River at Asheville 6.18 2.91 18.12 15.44 2 French Broad River, Newport to Asheville 6.18 3.67 18.42 16.43 3 Pigeon River at Newport 6.18 2.91 19.26 16.58 4 Nolichucky River at Embreeville 6.18 3.67 15.30 13.31 5 Nolichucky local, Embreeville to Nolichucky Dam 6.18 3.67 15.42 13.43

6 Douglas Dam local 6.18 4.43 17.16 15.94 7 Little Pigeon River at Sevierville 6.18 3.81 21.12 19.13 8 French Broad River local 6.18 3.81 19.38 17.39 9 South Holston Dam 6.18 4.60 12.12 10.90 10 Watauga Dam 6.18 3.67 12.96 10.97

11 Boone local 6.18 3.81 13.86 11.87 12 Fort Patrick Henry 6.18 4.60 14.34 13.12 13 North Fork Holston River near Gate City 6.18 4.60 12.30 11.08 14-15 Cherokee and Holston River below Fort Pat & Gate City 6.18 4.60 15.42 14.20 16 Holston River local, Cherokee Dam to Knoxville gage 6.18 4.60 16.74 15.52

17 Little River at mouth 6.18 3.81 20.82 18.83 18 Fort Loudoun local 6.18 3.81 17.28 15.29 19 Little Tennessee River at Needmore 6.18 2.73 20.22 17.54 20 Nantahala 6.18 2.73 20.94 18.26 21 Tuckasegee River at Bryson City 6.18 2.91 20.04 17.36

22 Fontana local 6.18 2.91 19.56 16.88 23 Little Tennessee River local, Fontana Dam to Chilhowee Dam 6.18 2.91 22.50 19.82 24 Little Tennessee River local, Chilhowee Dam to Tellico Dam 6.18 2.91 19.26 16.58 25 Watts Bar local above Clinch River 6.18 3.81 15.84 13.85 26 Clinch River at Norris Dam 6.18 4.60 13.56 12.34

27 Melton Hill local 6.18 4.27 15.42 14.01 33 Clinch River local above mile 16 6.18 4.43 15.42 14.01 34 Poplar Creek at mouth 6.18 4.43 14.88 13.47 35 Emory River at mouth 6.18 4.43 12.78 11.37 36 Clinch River local, mouth to mile 16 6.18 4.43 14.94 13.53

37 Watts Bar local below Clinch River 6.18 4.43 14.28 12.87 38 Chatuge Dam 6.18 2.91 21.12 18.44 39 Nottely Dam 6.18 2.91 18.66 15.98 40 Hiwassee River local below Chatuge and Nottely 6.18 2.73 18.18 15.50 41 Apalachia local 6.18 3.81 18.18 16.19

42 Blue Ridge Dam 6.18 2.91 22.14 19.46 43 Ocoee No. 1 local, Ocoee No. 1 to Blue Ridge Dam 6.18 2.91 18.42 15.74 Hiwassee River local, Charleston gage at mile 18.9 to Apalachia 44A and Ocoee No. 1 Dams 6.18 3.81 15.48 13.49 44B Hiwassee River local, mouth to Charleston gage at mile 18.9 6.18 4.27 14.52 13.11 45 Chickamauga local 6.18 4.27 13.56 12.15 BFN25

Table 3 (Sheet 2 of 2)

PROBABLE MAXIMUM FLOOD RAINFALL AND PRECIPITATION EXCESS

Antecedent Storm Main Storm Index Rainfall Runoff Rainfall Runoff No. Sub-basin Name (inches) (inches) (inches) (inches) 46 South Chickamauga Creek near Chattanooga 6.18 4.11 12.06 10.65 47A Nickajack local below North Chickamauga Creek @ gage 6.18 4.27 11.46 10.05 47B North Chickamauga Creek @ gage 6.18 4.27 12.30 10.89 48 Sequatchie River at Whitwell 6.18 4.27 12.06 10.65 49 Guntersville North local 6.18 4.27 10.44 9.03

50 Guntersville South local 6.18 4.27 9.90 8.49 51 Paint Rock River near Woodville 5.58 3.57 9.84 8.43 52 Paint Rock Local 5.58 3.57 9.84 8.43 53 Flint River near Chase 5.58 3.72 9.84 8.43 54 Flint River Local 5.58 3.43 9.84 8.43

55 Cotaco Creek at Florette 5.58 3.72 9.84 8.43 56 Cotaco Creek Local 5.58 3.72 9.84 8.43 57 Limestone Creek near Athens 5.58 3.72 9.84 8.43 58 Limestone Creek Local 5.58 3.72 9.84 8.43 59 Tims Ford Dam 5.58 3.28 9.84 8.24

60 Elk River Local, Tims Ford to Fayetteville 5.58 3.28 9.84 8.24 61 Elk River Local, Fayetteville to Prospect 5.58 3.28 9.84 8.24 62 Richland Creek at Mouth 5.58 3.72 9.84 8.43 63 Sugar Creek at Mouth 5.58 3.72 9.84 8.43 64 Elk River Local, Mile 16.5 to Prospect Gage 5.58 3.72 9.84 8.43 65 Wheeler Local 5.58 3.72 9.84 8.43

Basin Averages (inches) 6.08 3.85 14.48 12.74

aIndex No. corresponds to Figure 4 numbered areas.

bAdopted antecedent precipitation index prior to antecedent storm varies by unit area, ranging from 0.78-1.47 inches.

cComputed antecedent precipitatoin index prior to main storm, 3.65 inches.

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Table 4

DAM FAILURE STATISTICS

Deleted by Amendment 25

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