Text

Annual Radioactive Effluent Release Report
	ML25121A148
Person / Time
Site:	Browns Ferry
Issue date:	05/01/2025
From:	Komm D; Tennessee Valley Authority
To:	; Office of Nuclear Reactor Regulation, Document Control Desk
References
	Download: ML25121A148 (1)
	v • d • e

Post Office Box 2000, Decatur, Alabama 35609-2000 May 1, 2025 10 CFR 50.4 10 CFR 50.36(a) 10 CFR 50 Appendix I ATTN: Document Control Desk U.S. Nuclear Regulatory Commission Washington, D.C. 20555-0001 Browns Ferry Nuclear Plant, Units 1, 2, and 3 Renewed Facility Operating License Nos. DPR-33, DPR-52, and DPR-68 NRC Docket Nos. 50-259, 50-260, and 50-296

Subject:

2024 Annual Radioactive Effluent Release Report In accordance with Browns Ferry Nuclear Plant (BFN), Units 1, 2, and 3, Technical Specification Section 5.6.3, the Tennessee Valley Authority is submitting the BFN Annual Radioactive Effluent Release Report for the period January through December 2024. The Annual Radioactive Effluent Release Report is being submitted in conformance with Title 10 of the Code of Federal Regulations (10 CFR) 50.36a and 10 CFR 50, Appendix I, Section IV.B.1.

There are no new regulatory commitments contained in this letter. Should you have any questions concerning this submittal, please contact Dave J. Renn at (256) 729-2636.

Respectfully, Daniel A. Komm Site Vice President

Enclosure:

2024 Annual Radioactive Effluent Release Report cc (w/ Enclosure):

NRC Regional Administrator - Region II NRC Senior Resident Inspector - Browns Ferry Nuclear Plant NRC Project Manager - Browns Ferry Nuclear Plant

ENCLOSURE Browns Ferry Nuclear Plant Units 1, 2, and 3 2024 Annual Radioactive Effluent Release Report See Enclosed

Browns Ferry Nuclear Plant Tennessee Valley Authority Annual Radioactive Effluent Release Report 2024

Browns Ferry Nuclear Plant Units 1, 2 and 3 2024 Annual Radioactive Effluent Release Report Page 2 of 68 Table of Contents I.

Introduction.......................................................................................................................................... 4 II.

Supplemental Information.................................................................................................................... 4 A.

Regulatory Limits............................................................................................................................. 4 B.

Limitation on Dose Rate................................................................................................................... 4 C.

Average Energy................................................................................................................................ 5 D.

Measurements & Approximations of Total Radioactivity................................................................ 5 E.

Batch Releases................................................................................................................................. 7 F.

Abnormal Releases.......................................................................................................................... 7 G.

Non-routine, Planned Discharges.................................................................................................... 8 H.

Radioactive Waste System Treatment Changes.............................................................................. 9 I.

Land Use Census Changes................................................................................................................ 9 J.

Effluent Monitoring Instrument Inoperability > 30 Days................................................................. 9 K.

Effluent Monitoring Equipment Sample Deviation.......................................................................... 9 L.

Offsite Dose Calculation Manual Changes....................................................................................... 9 M.

Errata/Corrections to Previous ARERRs........................................................................................... 9 N.

Groundwater Monitoring Program (NEI 07-07)............................................................................... 9 III.

Gaseous Effluents.......................................................................................................................... 11 Table 1-A Gaseous Effluents - Summation of all Releases...................................................................... 12 Table 1-B Gaseous Effluents - Ground Level Releases (Batch)............................................................... 12 Table 1-B Gaseous Effluents - Ground Level Releases (Continuous)..................................................... 14 Table 1-C Gaseous Effluents - Elevated Releases (Batch)...................................................................... 15 Table 1-C Gaseous Effluents - Elevated Releases (Continuous)............................................................. 16 Table 1-D Gaseous Effluents - Mixed Mode Releases (Batch)............................................................... 17 Table 1-D Gaseous Effluents - Mixed Mode Releases (Continuous)...................................................... 18 IV.

Liquid Effluents.............................................................................................................................. 19 Table 2-A Liquid Effluents - Summation of all Releases.......................................................................... 19 Table 2-B Liquid Effluents - Batch Mode................................................................................................ 20 Table 2-B Liquid Effluents - Continuous Mode....................................................................................... 20 V.

Solid Waste Storage and Shipment..................................................................................................... 21 A.

Solid Waste Shipped Off-site for Burial or Disposal (Not Irradiated Fuel)..................................... 22 B.

Irradiated Fuel Shipments (Disposition)........................................................................................ 25

Browns Ferry Nuclear Plant Units 1, 2 and 3 2024 Annual Radioactive Effluent Release Report Page 3 of 68 VI.

Radiological Impact to Man........................................................................................................... 26 A.

Introduction................................................................................................................................... 26 B.

Dose Limits..................................................................................................................................... 26 C.

Dose Calculations........................................................................................................................... 27 D.

Doses from Airborne Effluents....................................................................................................... 27 E.

Doses from Liquid Effluents........................................................................................................... 28 F.

Population Doses........................................................................................................................... 29 G.

Offsite Direct Radiation Dose......................................................................................................... 30 H.

Dose to a Member of the Public Inside the Site Boundary............................................................ 30 I.

Total Dose...................................................................................................................................... 31 J.

Tables............................................................................................................................................. 32 Table 3-A Doses from Airborne Effluents - 1st Quarter.......................................................................... 32 Table 3-B Doses from Airborne Effluents - 2nd Quarter1........................................................................ 32 Table 3-C Doses from Airborne Effluents - 3rd Quarter.......................................................................... 33 Table 3-D Doses from Airborne Effluents - 4th Quarter1........................................................................ 33 Table 4-A Doses from Liquid Effluents - 1st Quarter............................................................................... 34 Table 4-B Doses from Liquid Effluents - 2nd Quarter.............................................................................. 34 Table 4-C Doses from Liquid Effluents - 3rd Quarter.............................................................................. 35 Table 4-D Doses from Liquid Effluents - 4th Quarter.............................................................................. 35 Table 4-E Total Dose from I-131 Water Ingestion.................................................................................. 36 Table 5 Total Dose from Fuel Cycle......................................................................................................... 37 VII.

Meteorological Data...................................................................................................................... 38 Table 6 - Ground Level Releases............................................................................................................. 38 Table 7 - Split Level Releases.................................................................................................................. 46 Table 8 - Elevated Releases..................................................................................................................... 61

Browns Ferry Nuclear Plant Units 1, 2 and 3 2024 Annual Radioactive Effluent Release Report Page 4 of 68 I.

Introduction II.

Supplemental Information A. Regulatory Limits

1. Gaseous Effluents Fission and Activation Gases The release of fission and activation gases is regulated by the dose limits of Title 10 of the Code of Federal Regulations (10 CFR) 50 Appendix I and Browns Ferry Nuclear Plant (BFN) Offsite Dose Calculation Manual (ODCM). The air dose to areas at and beyond the site boundary due to noble gases released in gaseous effluents per unit shall be limited

ŽŽŽŽ

mrad for beta radiation.

Iodines and Particulates with Half-Lives Greater than Eight Days The release of iodines and particulates in gaseous effluent is regulated by the dose limits of 10 CFR 50 Appendix I and the BFN ODCM. The dose to a member of the public from radioiodines, radioactive materials in particulate form, and radionuclides other than noble gases with half-lives greater than eight days in gaseous effluent released per unit to areas at and beyond the site boundary shall be limited to any organ during any

ŽŽmrem.

2. Liquid Effluents The release of radioactive liquid effluents is regulated by the dose limits of 10 CFR 50 Appendix I and the BFN ODCM. The doses or dose commitment to a member of the public from radioactive materials in liquid effluents released from each unit to unrestricŽŽŽ

ŽŽŽŽŽŽ

ŽŽŽ B. Limitation on Dose Rate

1. Gaseous Effluents Fission and Activation Gases The instantaneous release rate of fission and activation gases is based on the dose rate limits of 10 CFR 20.1301 and the BFN ODCM. The dose rate at any time to areas at and beyond the site boundary due to noble gases released in gaseous effluents from the

ŽŽŽŽ

to the skin.

The BFN ODCM Section 7.2 determines the maximum noble gas release rate.

Browns Ferry Nuclear Plant Units 1, 2 and 3 2024 Annual Radioactive Effluent Release Report Page 5 of 68 Iodines and Particulates with Half-Lives Greater than Eight Days The instantaneous release rate of particulates and iodines is regulated by the dose rate limits of the BFN ODCM. The dose rate at any time to areas at and beyond the site boundary, due to I-131, I-133, H-3, and particulates with half-lives greater than eight days

ŽŽŽŽ

any organ.

The BFN ODCM Section 7.3 determines the maximum particulate and iodine dose rates.

2. Liquid Effluents The concentration of radionuclides in liquid effluents released at any time from the site to unrestricted areas shall be limited to the concentrations specified in 10 CFR 20.1001-20.2402, Appendix B, Table 2, Column 2 for radionuclides other than dissolved or entrained noble gases.

For dissolved or entrained noble gases, the concentration shall be limited to 2E-

per milliliter (ml) total activity.

C. Average Energy The BFN ODCM limits the dose equivalent rates due to the release of noble gases to less than or equal to 500 mrem/year to the total body and less than or equal to 3000 mrem/year to the skin. The use of dose rate is in accordance with NUREG-0133, "Preparation of Radiological Effluent Technical Specifications for Nuclear Power Plants."

Since the release rate is not used for effluent control, the average beta and gamma energies (E) for gaseous effluents discussed in Regulatory Guide 1.21, "Measuring, Evaluation, and Reporting Radioactivity in Solid Wastes and Releases of Radioactive Materials in Liquid and Gaseous Effluents from Light-Water-Cooled Nuclear Power Plants," are not applicable and not included in this report.

D. Measurements & Approximations of Total Radioactivity Radioactivity measurements performed in support of the Browns Ferry Nuclear Plant ODCM meet the Lower Limit of Detection requirements given in ODCM Tables 2.2-1 and 2.2-2.

1. Gaseous Effluents Noble gases in the building vent and stack (elevated) gaseous effluents are continuously monitored. The flow rate of the stack is continuously monitored and the building vent effluent flow rates are calculated once a shift based on the configuration of operating exhaust fans. The vent flow is calculated for each release. Gas grab samples of the stack are taken and analyzed weekly. Gas grab samples of in-service vents are taken and analyzed monthly. The specific noble gas activity concentrations and total volume of the gases are used to calculate the total Curies of noble gases released.

In 2019, Browns Ferry revised noble gas sampling and analysis procedures which included sampling with a larger volume (1240 cc gas Marinelli) and analyzing for a longer count time (1000 seconds). Since this revision, the site has detected low levels of noble gases in the stack vent, which is expected.

Browns Ferry Nuclear Plant Units 1, 2 and 3 2024 Annual Radioactive Effluent Release Report Page 6 of 68 The tritium concentration is determined by the analysis of a monthly grab sample for each release point.

Iodines and particulates are continuously sampled on impregnated charcoal filters and particulate filters, respectively. The charcoal and particulate samples are replaced at least weekly and analyzed to determine specific activity concentrations. The specific activity concentrations and vent flow rate data are used weekly to verify that release rate limits were not exceeded. The specific activity concentrations and total volume of gaseous effluent are used on a monthly basis to determine the total curies of each particulate and iodine released during the month.

The gross alpha concentration is determined by analysis of a monthly particulate filter composite sample, and strontium-89 and strontium-90 are determined by analysis of a quarterly particulate filter composite sample for each release point.

Carbon-14 (C-14) production and gaseous waste effluent activity source term estimates were based on methodology provided in EPRI 1021106, Estimation of Carbon-14 in Nuclear Power Plant Gaseous Effluents, December 2010. C-14 gaseous activity and dose calculations are made using the following assumptions: (1) continuous release of the estimated C-14 generated for each unit during power operation based on the number of Effective Fuel Power Days (EFPD) for the period, (2) maximum C-14 activity from literature values cited in EPRI Report 1021106, and (3) typical fraction as carbon dioxide for gaseous releases from literature values also cited in EPRI Report 1021106.

In 2019, Browns Ferry updated C-14 production rate estimates utilizing the proxy methodology provided in EPRI Report 1021106. TVA documented this update in Updated Carbon-14 Production Rate Estimates for Gaseous Releases at TVA NPG Sites, October 2019. The C-14 releases increased in 2019 due to all three units completing Extended Power Uprate (EPU). The EPU for each unit increased the units MWth (Megawatt thermal) from 3,458 to 3,952 MWth. This increase in MWth is used in the calculation of C-14 releases. The increase in C-14 releases is expected.

2. Liquid Effluents The gamma ray emitting radionuclide concentrations are determined for each batch by gamma ray spectroscopy analysis of a grab sample. The allowable release rate is calculated for each batch based upon the known dilution flow. The flow rate of the liquid effluent is continuously monitored and the total volume released in each batch is determined. The total gamma activity released in each batch is determined by multiplying the radionuclide concentrations by the total volume discharged. The total gamma activity released during the month is then determined by summing the gamma activity content of each batch discharged during the month.

The gross alpha and tritium concentrations are measured on a monthly composite sample. The strontium-89, strontium-90, and iron-55 are measured on a quarterly composite sample.

Browns Ferry Nuclear Plant Units 1, 2 and 3 2024 Annual Radioactive Effluent Release Report Page 7 of 68 E. Batch Releases

1. Gaseous

2. Liquid Units 1st Quarter 2nd Quarter 3rd Quarter 4th Quarter Total

1. Number of Batch Releases 2

0 2

1 5

2. Total duration of batch releases minutes 9.60E+01 NA 2.72E+02 4.80E+01 4.16E+02

3. Maximum batch release duration minutes 4.80E+01 NA 2.24E+02 4.80E+01 2.24E+02

4. Average batch release duration minutes 4.80E+01 NA 1.36E+02 4.80E+01 8.32E+01

5. Minimum batch release duration minutes 4.80E+01 NA 4.80E+01 4.80E+01 4.80E+01 Units 1st Quarter 2nd Quarter 3rd Quarter 4th Quarter Total

1. Number of Batch Releases 5

2 0

1 8

2. Total duration of batch releases minutes 1.01E+03 4.05E+02 NA 1.90E+02 1.60E+03

3. Maximum batch release duration minutes 2.05E+02 2.05E+02 NA 1.90E+02 2.05E+02

4. Average batch release duration minutes 2.02E+02 2.03E+02 NA 1.90E+02 2.00E+02

5. Minimum batch release duration minutes 1.95E+02 2.00E+02 NA 1.90E+02 1.90E+02

6. Avg stream flow during periods of release of liquid effluent into a flowing stream CFS 6.38E+04 3.06E+04 2.33E+04 3.61E+04 NA

Browns Ferry Nuclear Plant Units 1, 2 and 3 2024 Annual Radioactive Effluent Release Report Page 8 of 68 F. Abnormal Releases

1. Abnormal Gaseous Releases In 2024, a total of four abnormal gaseous tritium releases occurred. Tritium was detected in the Auxiliary Boiler System when the boilers were in service for unit outages. The identified source of tritium to the auxiliary boiler system is main steam leak-by from degraded Steam Jet Air Ejector (SJAE) / Auxiliary Boiler valves to the auxiliary boiler header (CR 1508177). At the beginning of 2022, these valves were replaced during each units respective outage, with Unit 2 valves completing in Spring 2023. Following replacement of valves, low levels of tritium is still being detected in the auxiliary boilers, which may be due to in-service leak test (ISLT) not being completed on the Unit 1 valves (CR 1812308, 1921190).

2. Abnormal Liquid Releases In calendar year 2024, there were no abnormal liquid releases.

Units 1st Quarter 2nd Quarter 3rd Quarter 4th Quarter Total

1. Number of abnormal Releases 1

1 1

1 4

2. Total Activity for abnormal tritium releases Ci 2.36E-01 1.42E-02 1.96E-02 4.64E-02 3.17E-01 Units 1st Quarter 2nd Quarter 3rd Quarter 4th Quarter Total

1. Number of abnormal Releases 0

0 0

2. Total Activity for abnormal releases Ci NA NA NA NA NA

Browns Ferry Nuclear Plant Units 1, 2 and 3 2024 Annual Radioactive Effluent Release Report Page 9 of 68 G. Non-routine, Planned Discharges In calendar year 2024, there were no non-routine planned discharges.

H. Radioactive Waste System Treatment Changes In calendar year 2024, there were no changes to the radwaste system or the process control program.

I. Land Use Census Changes In calendar year 2024, there were no changes to the land use census.

J. Effluent Monitoring Instrument Inoperability greater than 30 Days In calendar year 2024, there were no effluent monitoring instruments inoperable greater than 30 days.

K. Effluent Monitoring Equipment Sample Deviation In calendar year 2024, there were two effluent monitoring equipment sample deviations.

The first sample deviation occurred during Unit 1 refueling outage (RFO). The 1-RM-90-0132D (Raw Cooling Water Radiation Monitor) was declared inoperable due to low flow at the monitor. The initial grab sample was not collected within the required ODCM, Table 1.1-1 Action D, sampling frequency of 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months ; this was due to no flow available at radmonitor or alternate sample points listed in sampling procedure. Flow and sample was obtained 30 minutes after the required sample time with results less than minimum detectable concentration (CR 1956412).

The second deviation occurred when 0-RM-90-252 (Radwaste gaseous vent) was in an LCO and the sample and flow were not obtained within the required ODCM Table 1.1-2 sampling frequency. This deviation occurred due to personnel error. The sample and flow were obtained 1hour 55minutes after the required sample time, with results less than minimum detectable concentration (CR 1963186).

L. Offsite Dose Calculation Manual Changes In calendar year 2024, there were no changes to the Offsite Dose Calculation Manual.

M. Errata/Corrections to Previous ARERRs In calendar year 2024, there are no errata or corrections to report from previous ARERRs.

Browns Ferry Nuclear Plant Units 1, 2 and 3 2024 Annual Radioactive Effluent Release Report Page 10 of 68 N. Groundwater Monitoring Program (NEI 07-07)

In 2007, the Nuclear Energy Institute (NEI) established the Groundwater Protection Initiative (GPI), NEI 07-07. The Groundwater Protection Initiative was established to 1) improve management of situations involving inadvertent radiological releases that get into groundwater and 2) to improve communication with external stakeholders to enhance trust and confidence on the part of local communities, states, the NRC, and the public in the nuclear industrys commitment to a high standard of public radiation safety and protection of the environment. This section provides information and sample results from on-site groundwater locations that were sampled in support of the Groundwater Protection Initiative at Browns Ferry Nuclear Plant. The groundwater wells described in this section are not part of the Radiological Environmental Monitoring Program (REMP).

In the early 2000s, BFN initiated a groundwater study to identify the source of low level tritium detected on-site. Results from the groundwater study (Investigation of Tritium Releases to Groundwater, 2006), suggest the source of tritiated groundwater was from historical leaks and spills associated with Radwaste/Condensate transfer tunnel.

Groundwater and surface water level measurements during the study indicated the return channel and subsequently the Tennessee River will ultimately be recipient to tritiated groundwater discharge from the site. It has been determined that there are no groundwater wells onsite or within 2-miles of the site that are used as a source of drinking water.

Groundwater movement in the area has been determined to be from the plant site toward the Tennessee River.

On-site groundwater monitoring was performed in 2024. The purpose of on-site groundwater monitoring is to ensure timely detection of inadvertent radiological releases to groundwater. Non-REMP groundwater wells monitor for potential leaks from plant equipment. As part of the GPI, BFN monitored a total of 30 groundwater wells located in the protected area and the owner-controlled area during 2024. Normal sampling frequencies are quarterly and semiannually with some wells sampled monthly if certain criteria are met or for investigation purposes. Samples are routinely analyzed for environmental level tritium (H-3) and principle gamma emitters (PGE) with selected wells analyzed for Hard-to-Detect (HTD) radionuclides (Gross Alpha, Fe-55, Ni-63, Sr-89, and Sr-90). In support of the groundwater program, the site also monitors recapture and on-site storm drains, catch basins, and surface water.

In 2024, low levels of tritium were detected in on-site groundwater wells as indicated in Table 9, Groundwater Data. Table 9 demonstrates all on-site groundwater wells that indicated detectable tritium concentrations. Tritium concentrations in 2024 ranged from 125 pCi/L, up to a maximum concentration of 6,890 pCi/L (MW-01). No other plant related radionuclides were detected in any groundwater well. There were no instances of any on-site spills or leaks that occurred during the 2024 reporting period that were communicated to off-site agencies or that met the criteria in NEI 07-07, Appendix A.

Browns Ferry Nuclear Plant Units 1, 2 and 3 2024 Annual Radioactive Effluent Release Report Page 11 of 68 Table 9 - Groundwater Data Sample Date Well ID Tritium Activity (pCi/L)

Sample Date Well ID Tritium Activity (pCi/L) 1st Quarter 2024 2nd Quarter 2024 2/14/2024 Dewat-A 1,630 5/15/2024 Dewat-A 1,930 2/13/2024 MW-01 2,110 5/14/2024 MW-01 811 2/13/2024 MW-02 1,020 5/15/2024 MW-02 588 2/13/2024 MW-02i 760 5/15/2024 MW-02i 126 2/13/2024 MW-03 520 5/15/2024 MW-03 323 2/13/2024 MW-04 2,890 5/14/2024 MW-04 461 2/13/2024 MW-07 784 5/14/2024 MW-07 245 2/13/2024 MW-08 679 5/14/2024 MW-08 203 2/13/2024 MW-08i 336 5/14/2024 MW-08i 224 2/13/2024 MW-15 247 5/13/2024 MW-15 125 2/13/2024 MW-19 328 5/15/2024 Well 6R 316 2/14/2024 Well 6R 617 3rd Quarter 2024 4th Quarter 2024 8/6/2024 Dewat-A 2,250 11/21/2024 Dewat-A 5,340 8/7/2024 MW-01 6,890 11/20/2024 MW-01 1,990 8/6/2024 MW-02 612 11/20/2024 MW-02 1,210 8/6/2024 MW-02i 549 11/20/2024 MW-02i 2,210 8/7/2024 MW-03 389 11/21/2024 MW-03 374 8/6/2024 MW-04 979 11/20/2024 MW-04 1,020 8/6/2024 MW-07 338 11/20/2024 MW-07 362 8/6/2024 MW-08 352 11/21/2024 MW-08 471 8/6/2024 MW-08i 296 11/21/2024 MW-08i 283 8/7/2024 MW-15 544 11/19/2024 MW-14 455 8/7/2024 MW-18 426 11/21/2024 MW-15 459 8/6/2024 MW-19 435 11/20/2024 MW-18 531 8/7/2024 Well 6R 324 11/20/2024 MW-19 234 11/21/2024 Well 6R 462 11/19/2024 Well 5s 588

Browns Ferry Nuclear Plant Units 1, 2 and 3 2024 Annual Radioactive Effluent Release Report Page 12 of 68 III.

Gaseous Effluents Table 1-A Gaseous Effluents - Summation of all Releases 1 Includes activity from abnormal gaseous releases. Dilution flow was not determined for abnormal releases.

Applicable Limits are expressed in terms of dose. Reference Section VI, Radiological Impact, Table 3.

Units 1st Quarter 2nd Quarter 3rd Quarter 4th Quarter Total Error %

A. Fission and Activation Gases

1. Total Release Curies

<LLD

<LLD 3.12E-01

+/- 45%

2. Average Release Rate for Period Ci/sec

<LLD

<LLD 3.93E-02

<LLD 9.87E-03

3. Percent of Tech Spec Limit B. Iodines

1. Total I-131 Release Curies 7.92E-06 1.03E-04 3.81E-05 1.03E-05 1.59E-04

+/- 36%

2. Average Release Rate for Period Ci/sec 1.01E-06 1.31E-05 4.79E-06 1.29E-06 5.04E-06

3. Percent of Tech Spec Limit C. Particulates

1. Total Release Curies 5.19E-04 8.24E-05 3.66E-04 2.28E-03 3.24E-03

+/- 35%

2. Average Release Rate for Period Ci/sec 6.60E-05 1.05E-05 4.61E-05 2.86E-04 1.03E-04

3. Percent of Tech Spec Limit D. Tritium

1. Total Release Curies 3.71E+011 2.10E+011 4.34E+011 1.43E+011 1.16E+021

+/- 21%

2. Average Release Rate for Period Ci/sec 4.73E+00 2.67E+00 5.45E+00 1.81E+00 3.67E+00

3. Percent of Tech Spec Limit E. Gross Alpha

1. Total Release Curies

<LLD

2. Average Release Rate for Period Ci/sec

<LLD

3. Percent of Tech Spec Limit F. Carbon-14

1. Total Release Curies 1.17E+01 1.34E+01 1.27E+01 1.38E+01 5.16E+01

2. Percent of Tech Spec Limit

Browns Ferry Nuclear Plant Units 1, 2 and 3 2024 Annual Radioactive Effluent Release Report Page 13 of 68 Table 1-B Gaseous Effluents - Ground Level Releases (Batch)1 1 There were no gaseous batch releases through the ground release vents in 2024.

Units 1st Quarter 2nd Quarter 3rd Quarter 4th Quarter Total

1. Fission and Activation Gases Kr-85 Ci NA NA NA NA NA Kr-85m Ci NA NA NA NA NA Kr-87 Ci NA NA NA NA NA Kr-88 Ci NA NA NA NA NA Xe-133 Ci NA NA NA NA NA Xe-135m Ci NA NA NA NA NA Xe-138 Ci NA NA NA NA NA Total For Period Ci NA NA NA NA NA

2. Iodines I-131 Ci NA NA NA NA NA I-133 Ci NA NA NA NA NA I-135 Ci NA NA NA NA NA Total For Period Ci NA NA NA NA NA

3. Particulates Na-24 Ci NA NA NA NA NA Mn-54 Ci NA NA NA NA NA Co-58 Ci NA NA NA NA NA Co-60 Ci NA NA NA NA NA Zn-65 Ci NA NA NA NA NA Sr-89 Ci NA NA NA NA NA Sr-90 Ci NA NA NA NA NA Ag-110m Ci NA NA NA NA NA Cs-134 Ci NA NA NA NA NA Cs-137 Ci NA NA NA NA NA Ba-140 Ci NA NA NA NA NA La-140 Ci NA NA NA NA NA Total For Period Ci NA NA NA NA NA

4. Gross Alpha Gross Alpha Ci NA NA NA NA NA

5. Tritium H-3 Ci NA NA NA NA NA

Browns Ferry Nuclear Plant Units 1, 2 and 3 2024 Annual Radioactive Effluent Release Report Page 14 of 68 Table 1-B Gaseous Effluents - Ground Level Releases (Continuous) 1 Includes activity from abnormal gaseous releases. Dilution flow was not determined for abnormal releases.

Units 1st Quarter 2nd Quarter 3rd Quarter 4th Quarter Total

1. Fission and Activation Gases Kr-85 Ci

<LLD

<LLD Kr-85m Ci

<LLD

<LLD Kr-87 Ci

<LLD

<LLD Kr-88 Ci

<LLD

<LLD Xe-133 Ci

<LLD

<LLD Xe-135m Ci

<LLD

<LLD Xe-138 Ci

<LLD

<LLD Total For Period Ci

<LLD

2. Iodines I-131 Ci 1.38E-06 6.37E-06 2.93E-06 1.92E-06 1.26E-05 I-133 Ci 7.32E-06

<LLD

<LLD 7.32E-06 I-135 Ci

<LLD

<LLD Total For Period Ci 8.70E-06 6.37E-06 2.93E-06 1.92E-06 1.99E-05

3. Particulates Mn-54 Ci

<LLD

<LLD Co-58 Ci

<LLD

<LLD Co-60 Ci

<LLD

<LLD 3.32E-06

<LLD 3.32E-06 Zn-65 Ci

<LLD

<LLD Sr-89 Ci

<LLD

<LLD Sr-90 Ci

<LLD

<LLD Cs-134 Ci

<LLD

<LLD Cs-137 Ci

<LLD

<LLD Ba-140 Ci

<LLD

<LLD La-140 Ci

<LLD

<LLD Total For Period Ci

<LLD

<LLD 3.32E-06

4. Gross Alpha Gross Alpha Ci

<LLD

5. Tritium H-3 Ci 1.78E+011 1.05E+011 1.60E+011 9.06E+001 5.34E+011

Browns Ferry Nuclear Plant Units 1, 2 and 3 2024 Annual Radioactive Effluent Release Report Page 15 of 68 Table 1-C Gaseous Effluents - Elevated Releases (Batch)1 1 There were no gaseous batch releases through the elevated release vent in 2024.

Units 1st Quarter 2nd Quarter 3rd Quarter 4th Quarter Total

1. Fission and Activation Gases Kr-85 Ci NA NA NA NA NA Kr-85m Ci NA NA NA NA NA Kr-87 Ci NA NA NA NA NA Kr-88 Ci NA NA NA NA NA Xe-133 Ci NA NA NA NA NA Xe-135m Ci NA NA NA NA NA Xe-138 Ci NA NA NA NA NA Total For Period Ci NA NA NA NA NA

2. Iodines I-131 Ci NA NA NA NA NA I-133 Ci NA NA NA NA NA I-135 Ci NA NA NA NA NA Total For Period Ci NA NA NA NA NA

3. Particulates Mn-54 Ci NA NA NA NA NA Co-58 Ci NA NA NA NA NA Co-60 Ci NA NA NA NA NA Zn-65 Ci NA NA NA NA NA Sr-89 Ci NA NA NA NA NA Sr-90 Ci NA NA NA NA NA Ag-110m Ci NA NA NA NA NA Cs-134 Ci NA NA NA NA NA Cs-137 Ci NA NA NA NA NA Ba-140 Ci NA NA NA NA NA La-140 Ci NA NA NA NA NA Total For Period Ci NA NA NA NA NA

4. Gross Alpha Gross Alpha Ci NA NA NA NA NA

5. Tritium H-3 Ci NA NA NA NA NA

Browns Ferry Nuclear Plant Units 1, 2 and 3 2024 Annual Radioactive Effluent Release Report Page 16 of 68 Table 1-C Gaseous Effluents - Elevated Releases (Continuous)

Units 1st Quarter 2nd Quarter 3rd Quarter 4th Quarter Total

1. Fission and Activation Gases Ar-41 Ci

<LLD

<LLD 3.12E-01

<LLD 3.12E-01 Kr-85m Ci

<LLD

<LLD Kr-85 Ci

<LLD

<LLD Kr-87 Ci

<LLD

<LLD Kr-88 Ci

<LLD

<LLD Xe-133 Ci

<LLD

<LLD Xe-135 Ci

<LLD

<LLD Xe-135m Ci

<LLD

<LLD Xe-138 Ci

<LLD

<LLD Total For Period Ci

<LLD

<LLD 3.12E-01

2. Iodines I-131 Ci 2.16E-06 5.27E-05 1.84E-05 8.39E-06 8.17E-05 I-133 Ci 8.53E-05 1.37E-04 8.10E-05 9.16E-05 3.95E-04 I-135 Ci

<LLD

<LLD Total For Period Ci 8.74E-05 1.90E-04 9.94E-05 1.00E-04 4.76E-04

3. Particulates Mn-54 Ci

<LLD

<LLD Co-58 Ci

<LLD

<LLD Co-60 Ci

<LLD

<LLD Zn-65 Ci

<LLD

<LLD Sr-89 Ci 1.95E-06 4.48E-06 1.28E-06 1.44E-07 7.86E-06 Sr-90 Ci

<LLD

<LLD Ag-110m Ci

<LLD

<LLD Cs-134 Ci

<LLD

<LLD Cs-137 Ci

<LLD

<LLD Ba-140 Ci

<LLD

<LLD La-140 Ci

<LLD

<LLD Au-199 Ci 2.11E-04 2.20E-05 3.66E-05 5.33E-05 3.23E-04 Total For Period Ci 2.13E-04 2.65E-05 3.79E-05 5.35E-05 3.31E-04

4. Gross Alpha Gross Alpha Ci

<LLD

5. Tritium H-3 Ci 4.20E+00 1.06E+00 2.94E+00 1.20E+00 9.41E+00

6. Carbon-14 C-14 Ci 1.17E+01 1.34E+01 1.27E+01 1.38E+01 5.16E+01

Browns Ferry Nuclear Plant Units 1, 2 and 3 2024 Annual Radioactive Effluent Release Report Page 17 of 68 Table 1-D Gaseous Effluents - Mixed Mode Releases (Batch)1 1 Batch releases occurred in 1st, 3rd, and 4th Quarters 2024 in support of unit outages. There were no batch releases in 2nd Quarter 2024.

Units 1st Quarter 2nd Quarter 3rd Quarter 4th Quarter Total

1. Fission and Activation Gases Kr-85 Ci

<LLD NA

<LLD

<LLD Kr-85m Ci

<LLD NA

<LLD

<LLD Kr-87 Ci

<LLD NA

<LLD

<LLD Kr-88 Ci

<LLD NA

<LLD

<LLD Xe-133 Ci

<LLD NA

<LLD

<LLD Xe-135m Ci

<LLD NA

<LLD

<LLD Xe-138 Ci

<LLD NA

<LLD

<LLD Total For Period Ci

<LLD NA

<LLD

2. Iodines I-131 Ci

<LLD NA

<LLD

<LLD I-133 Ci

<LLD NA

<LLD

<LLD I-135 Ci

<LLD NA

<LLD

<LLD Total For Period Ci

<LLD NA

<LLD

3. Particulates Na-24 Ci

<LLD NA

<LLD

<LLD Mn-54 Ci

<LLD NA

<LLD

<LLD Co-58 Ci

<LLD NA

<LLD

<LLD Co-60 Ci

<LLD NA

<LLD

<LLD Zn-65 Ci

<LLD NA

<LLD

<LLD Sr-89 Ci

<LLD NA

<LLD

<LLD Sr-90 Ci

<LLD NA

<LLD

<LLD Ag-110m Ci

<LLD NA

<LLD

<LLD Cs-134 Ci

<LLD NA

<LLD

<LLD Cs-137 Ci

<LLD NA

<LLD

<LLD Ba-140 Ci

<LLD NA

<LLD

<LLD La-140 Ci

<LLD NA

<LLD

<LLD Total For Period Ci

<LLD NA

<LLD

4. Gross Alpha Gross Alpha Ci

<LLD NA

<LLD

5. Tritium H-3 Ci 7.58E-04 NA 1.12E-03 4.54E-04 2.33E-03

Browns Ferry Nuclear Plant Units 1, 2 and 3 2024 Annual Radioactive Effluent Release Report Page 18 of 68 Table 1-D Gaseous Effluents - Mixed Mode Releases (Continuous)

Units 1st Quarter 2nd Quarter 3rd Quarter 4th Quarter Total

1. Fission and Activation Gases Kr-85 Ci

<LLD

<LLD Kr-85m Ci

<LLD

<LLD Kr-87 Ci

<LLD

<LLD Kr-88 Ci

<LLD

<LLD Xe-133 Ci

<LLD

<LLD Xe-135m Ci

<LLD

<LLD Xe-138 Ci

<LLD

<LLD Total For Period Ci

<LLD

2. Iodines I-131 Ci 4.38E-06 4.38E-05 1.68E-05

<LLD 6.49E-05 I-133 Ci 3.97E-05 1.96E-04 6.78E-05

<LLD 3.04E-04 I-135 Ci

<LLD

<LLD Total For Period Ci 4.41E-05 2.40E-04 8.45E-05

<LLD 3.69E-04

3. Particulates Na-24 Ci

<LLD

<LLD 1.11E-04 1.12E-03 1.23E-03 Cr-51 Ci 1.48E-04

<LLD 4.10E-05 1.96E-05 2.09E-04 Mn-54 Ci 1.09E-05 6.27E-06 4.85E-06 1.02E-04 1.24E-04 Co-58 Ci 3.49E-05 2.71E-06 1.02E-05 4.34E-04 4.82E-04 Co-60 Ci 1.04E-04 4.32E-05 1.33E-04 3.36E-04 6.16E-04 Zn-65 Ci

<LLD

<LLD 1.59E-04 1.59E-04 Mo-99 Ci

<LLD

<LLD 1.35E-05 3.36E-05 4.71E-05 Sr-89 Ci

<LLD

<LLD 1.05E-06 1.05E-06 Sr-90 Ci

<LLD

<LLD 2.08E-07 2.08E-07 Nb-95 Ci

<LLD

<LLD Ag-110m Ci 8.77E-06 3.71E-06 7.65E-06 2.13E-05 4.14E-05 Cs-134 Ci

<LLD

<LLD Cs-137 Ci

<LLD

<LLD Au-199 Ci

<LLD

<LLD 3.64E-06

<LLD 3.64E-06 Total For Period Ci 3.06E-04 5.59E-05 3.25E-04 2.22E-03 2.91E-03

4. Gross Alpha Gross Alpha Ci

<LLD

5. Tritium H-3 Ci 1.51E+01 9.39E+00 2.44E+01 4.13E+00 5.30E+01

Browns Ferry Nuclear Plant Units 1, 2 and 3 2024 Annual Radioactive Effluent Release Report Page 19 of 68 IV.

Liquid Effluents Table 2-A Liquid Effluents - Summation of all Releases

Applicable Limits are expressed in terms of dose. Reference Section VI, Radiological Impact, Table 4.

Units 1st Quarter 2nd Quarter 3rd Quarter 4th Quarter Total Error %

A. Fission and Activation Products

1. Total Release Curies 3.24E-03 3.98E-04 9.65E-04 1.13E-02 1.59E-02

+/- 9%

2. Average Diluted Concentration Ci/mL 4.67E-11 2.95E-12 5.74E-12 3.27E-10 3.91E-11

3. Percent of Tech Spec Limit

B. Tritium

1. Total Release Curies 4.74E-01 2.54E-01 1.19E-01 1.28E-01 9.76E-01

+/- 6%

2. Average Diluted Concentration Ci/mL 6.83E-09 1.88E-09 7.11E-10 3.69E-09 2.40E-09

3. Percent of Tech Spec Limit C. Dissolved and Entrained Noble Gases

1. Total Release Curies

<LLD

+/- 8%

2. Average Diluted Concentration Ci/mL

<LLD

3. Percent of Tech Spec Limit D. Gross Alpha Radioactivity

1. Total Release Curies

<LLD

+/- 48%

2. Average Diluted Concentration Ci/mL

<LLD

<LLD E. Volume of Liquid Waste to Discharge Canal (prior to dilution)

Liters 3.78E+07 6.29E+07 1.02E+08 1.27E+07 2.16E+08 F. Volume of Dilution Water for Period Liters 6.94E+10 1.35E+11 1.68E+11 3.47E+10 4.07E+11

+/- 10%

G. Total CCW Gigal 2.38E+02 2.76E+02 2.57E+02 2.78E+02 1.05E+03

Browns Ferry Nuclear Plant Units 1, 2 and 3 2024 Annual Radioactive Effluent Release Report Page 20 of 68 Table 2-B Liquid Effluents - Batch Mode 1 There were no batch releases during 3rd Quarter 2024.

Units 1st Quarter 2nd Quarter 3rd1 Quarter 4th Quarter Total

1. Fission and Activation Products Au-199 Ci

<LLD

<LLD NA 7.08E-04 7.08E-04 Na-24 Ci

<LLD

<LLD NA 2.68E-05 2.68E-05 Cr-51 Ci

<LLD

<LLD NA 3.77E-03 3.77E-03 Mn-54 Ci 1.68E-04 1.47E-05 NA 2.34E-04 4.16E-04 Fe-55 Ci 2.38E-04 7.38E-05 NA 6.73E-04 9.84E-04 Fe-59 Ci

<LLD

<LLD NA 9.28E-05 9.28E-05 Co-58 Ci

<LLD

<LLD NA 4.26E-04 4.26E-04 Co-60 Ci 2.74E-03 2.90E-04 NA 4.82E-03 7.85E-03 Zn-65 Ci

<LLD

<LLD NA 1.42E-04 1.42E-04 Zr-95 Ci

<LLD

<LLD NA 2.62E-05 2.62E-05 Sr-89 Ci

<LLD

<LLD NA 1.54E-05 1.54E-05 Nb-95 Ci

<LLD

<LLD NA 2.92E-05 2.92E-05 Ag-110m Ci

<LLD

<LLD NA 2.01E-04 2.01E-04 Sb-124 Ci

<LLD

<LLD NA 1.08E-05 1.08E-05 Cs-137 Ci 9.58E-05 1.91E-05 NA 1.47E-04 2.62E-04 Total For Period Ci 3.24E-03 3.98E-04 NA 1.13E-02 1.50E-02

2. Dissolved and Entrained Gases Xe-133 Ci

<LLD

<LLD NA

<LLD

<LLD Xe-135 Ci

<LLD

<LLD NA

<LLD

<LLD Total For Period Ci

<LLD

<LLD NA

<LLD

3. Tritium H-3 Ci 4.03E-01 1.72E-01 NA 1.08E-01 6.83E-01

Browns Ferry Nuclear Plant Units 1, 2 and 3 2024 Annual Radioactive Effluent Release Report Page 21 of 68 Table 2-B Liquid Effluents - Continuous Mode Units 1st Quarter 2nd Quarter 3rd Quarter 4th Quarter Total

1. Fission and Activation Products Co-58 Ci

<LLD

<LLD Co-60 Ci

<LLD

<LLD 9.65E-04

<LLD 9.65E-04 Fe-55 Ci

<LLD

<LLD Sr-89 CI

<LLD

<LLD Sr-90 Ci

<LLD

<LLD Total For Period Ci

<LLD

<LLD 9.65E-04

2. Dissolved and Entrained Gases Xe-133 Ci

<LLD

<LLD Xe-135 Ci

<LLD

<LLD Total For Period Ci

<LLD

3. Tritium Ci 7.14E-02 8.25E-02 1.19E-01 1.95E-02 2.93E-01

4. Gross Alpha Ci

<LLD

Browns Ferry Nuclear Plant Units 1, 2 and 3 2024 Annual Radioactive Effluent Release Report Page 22 of 68 V.

Solid Waste Storage and Shipment A. Solid Waste Shipped Off-site for Burial or Disposal (Not Irradiated Fuel)

1.

Type of Waste Units Jan-June July-Dec Error %

a. Spent resins, filters, filter sludge m3 1.29E+02 3.57E+01

+/-25.0 evaporator bottoms, etc.

Ci 4.66E+02 1.24E+01

+/-25.0

b.

Dry compressible waste, contaminated m3 1.32E+03 1.45E+03

+/-25.0 equipment, etc.

Ci 6.89E-01 1.69E+00

+/-25.0

c.

Irradiated components, control rod m3 0.00E+00 0.00E+00

+/-25.0 blades & LPRMs with fission chambers Ci 0.00E+00 0.00E+00

+/-25.0

d.

Other - Combined Packages m3 0.00E+00 0.00E+00

+/-25.0 Ci 0.00E+00 0.00E+00

+/-25.0

Browns Ferry Nuclear Plant Units 1, 2 and 3 2024 Annual Radioactive Effluent Release Report Page 23 of 68

2.

Estimate of major nuclide composition (by type of waste)

a. Spent resins, filters, filter sludge evaporator bottoms, etc.

Isotope

% Abundance Curies H-3 7.49E-03 3.57E-02 C-14 5.64E-02 2.69E-01 Cr-51 1.80E+00 8.60E+00 Mn-54 9.90E+00 4.72E+01 Fe-55 1.31E+01 6.27E+01 Fe-59 5.93E-01 2.83E+00 Co-57 4.45E-02 2.12E-01 Co-58 1.89E+01 9.00E+01 Co-60 3.23E+01 1.54E+02 Ni-59 4.24E-03 2.02E-02 Ni-63 1.49E+00 7.10E+00 Zn-65 1.27E+01 6.06E+01 Sr-89 5.18E-01 2.47E+00 Sr-90 1.51E-02 7.21E-02 Zr-95 3.98E-01 1.90E+00 Nb-95 7.78E-02 3.71E-01 Tc-99 1.06E-02 5.06E-02 Ag-110m 5.58E+00 2.66E+01 Sb-124 1.33E-01 6.34E-01 Cs-134 4.03E-02 1.92E-01 Cs-137 2.28E+00 1.09E+01 Pu-238 4.30E-05 2.05E-04 Pu-239 1.94E-05 9.24E-05 Pu-240 1.94E-05 9.24E-05 Pu-241 3.29E-03 1.57E-02 Am-241 4.86E-05 2.32E-04 Cm-242 2.37E-05 1.13E-04 Cm-243 1.61E-05 7.68E-05 Cm-244 1.61E-05 7.67E-05

Browns Ferry Nuclear Plant Units 1, 2 and 3 2024 Annual Radioactive Effluent Release Report Page 24 of 68

b. Dry compressible waste, contaminated equipment, etc.

Isotope

% Abundance Curies H-3 7.45E+00 1.35E-02 C-14 4.19E-04 2.90E-05 Cr-51 3.98E+00 1.33E-01 Mn-54 6.31E+00 2.17E-01 Fe-55 8.23E-01 7.78E-01 Fe-59 1.02E+00 2.28E-02 Co-58 4.92E+01 8.29E-02 Co-60 1.42E+01 9.07E-01 Ni-63 1.80E+00 2.66E-02 Zn-65 5.05E-01 5.87E-02 Sr-89 1.02E-03 1.32E-04 Sr-90 0.00E+00 2.90E-05 Zr-95 1.52E-01 2.00E-02 Nb-95 3.33E-01 4.28E-02 Ag-110m 4.83E-01 4.73E-02 Sb-124 7.32E-02 6.67E-03 Sb-125 7.32E-02 8.25E-08 Cs-137 1.81E+00 2.83E-02

c. Irradiated components, control rod blades & LPRMs with fission chambers Nuclide Percentage Curies 0

0 0

d. Other -Combined Packages Nuclide Percentage Curies 0

0 0

Browns Ferry Nuclear Plant Units 1, 2 and 3 2024 Annual Radioactive Effluent Release Report Page 25 of 68

3. Solid Waste Disposition Number of Shipments Mode of Transportation Destination 1

ESS(TVA)

Energy Solutions Services Inc.

1560 Bear Creek Road 19 Hittman Transport Services Energy Solutions LLC.(Clive)

Clive Disposal Site -

Containerized Waste Facility 6

Hittman Transport Services Energy Solutions Memphis 1790 Dock Street 9

Hittman Transport Services Energy Solutions Services Inc.

1560 Bear Creek Road 1

Hittman Transport Services Unitech Service Group, Inc.

Oak Ridge Services Center 14 Interstate Ventures, Inc.

Waste Control Specialist, LLC TSDF 1

Interstate Ventures, Inc Waste Control Specialist, LLC CWF 46 Specialty Transport, Inc.

Unitech Service Group, Inc.

Oak Ridge Services Center B. Irradiated Fuel Shipments (Disposition)

Number of Shipments Mode of Transportation Destination 0

NA NA

Browns Ferry Nuclear Plant Units 1, 2 and 3 2024 Annual Radioactive Effluent Release Report Radiological Impact Page 26 of 68 VI.

Radiological Impact to Man A. Introduction Potential doses to the "maximum exposed individual" and the population around Browns Ferry Nuclear Plant (BFN) are calculated for each quarter as required in Section 5.2 of the Offsite Dose Calculation Manual (ODCM). The methodology used to estimate dose for determining plant releases for the reporting period is specified in Sections 6 and 7 of the ODCM. Dispersion of radioactive effluents in the environment is estimated using meteorological data and river flows. In this report, the doses resulting from releases are described and compared to limits established for BFN.

B. Dose Limits The ODCM specifies limits for the release of radioactive effluents, as well as limits for doses to the general public from the release of radioactive effluents. These limits are set well below the Technical Specification limits which govern the concentrations of radioactivity and doses permissible in unrestricted areas. This ensures that radioactive effluent releases are As Low As Reasonably Achievable (ALARA).

The air dose limits in areas at and beyond the Site Boundary due to noble gases released in gaseous effluents per unit are:

x

ŽŽ and x

ŽŽ The dose limits to a member of the public in an unrestricted area from radioiodines, radioactive materials in particulate form, and radionuclides other than noble gases with half lives > 8 days released in gaseous effluents for each unit are:

x

ŽŽ The dose or dose commitment to a member of the public from radioactive material in liquid effluents released to unrestricted areas are:

x

ŽŽŽ and x

ŽŽ The limit for the total effective dose equivalent to an individual member of the public inside the site boundary is:

x 100 mrem per year.

Browns Ferry Nuclear Plant Units 1, 2 and 3 2024 Annual Radioactive Effluent Release Report Radiological Impact Page 27 of 68 The Environmental Protection Agency limits for total dose to any member of the public in the vicinity of a nuclear power plant, established in the Environmental Dose Standard of 40 CFR 190, are:

x

ŽŽŽŽŽ and x

ŽŽŽ C. Dose Calculations Estimated doses to members of the public are determined using the following computer models: Gaseous Effluent Licensing Code (GELC), and the Quarterly Water Dose Assessment Code (QWATA). These models are based on guidance provided by the Nuclear Regulatory Commission (NRC) for determining the potential dose to individuals and populations living in the vicinity of the plant. The area around the plant is analyzed to determine the pathways through which the public may receive a dose. The doses calculated are a representation of the dose to a "maximum exposed individual." Some of the factors used in these calculations (such as ingestion rates) are maximum values to ensure conservative reporting of data. The values chosen will tend to overestimate the dose. The expected dose to actual individuals is lower. The calculated doses are presented in Tables 3, 4, and 5.

D. Doses from Airborne Effluents For airborne effluents, members of the public can be exposed to radiation from several sources: direct radiation from the radioactivity in the air, direct radiation from radioactivity deposited on the ground, inhalation of airborne radioactivity, ingestion of vegetation which contains radioactivity deposited from the atmosphere, and ingestion of milk and beef which contains radioactivity deposited from the atmosphere onto vegetation and subsequently consumed by animals.

Releases from the stack are considered to be elevated releases. The Joint Frequency Distributions (JFDs) for elevated releases are based on wind directions and wind speeds measured at 90.29 meters and the vertical temperature difference between 10.03 and 89.59 meters. A ten-year meteorological average from 2009-2018 is given in the Meteorological Data Tables 6, 7, 8.

Meteorological variables at BFN are measured continuously. Measurements collected include wind speed and wind direction at heights of 10.5, 45.74, and 90.29 meters above the ground, and temperature at heights of 10.03, 45.30, and 89.59 meters above the ground. In 2023, BFN revised ODCM from using quarterly JFDs to ten-year averaged JFDs, using 2009-2018 data. Ten-year JFDs are calculated for each release point using the appropriate levels of meteorological data. The JFD gives the percentage of the time that the wind is blowing out of a particular upwind compass sector in a particular range of wind speeds for a given stability class A through G. The wind speeds are divided into nine wind speed ranges. Calms are distributed by direction in proportion to the distribution of noncalm wind directions less than

Browns Ferry Nuclear Plant Units 1, 2 and 3 2024 Annual Radioactive Effluent Release Report Radiological Impact Page 28 of 68 1.6 m/s (3.5 mph). Stability classes are determined from the vertical temperature difference between two measurement levels.

The generally open terrain around BFN does not cause any significant effects on the transport and dispersion of gaseous effluents from the plant. Within 30 kilometers of BFN, the terrain is mostly gently rolling hills (30-60 meters). Between 30 and 80 kilometers, the hills become larger to the north and south and mountainous to the east and northeast. The Tennessee River/Wheeler Lake may have a minor effect on transport and dispersion in the immediate vicinity of BFN during periods of winds with a southerly component, overcast skies, and relatively high wind speeds. Also, the lower layer (10-45 meters) stability class tends to be more stable. However, during this infrequent condition, dose estimates will be conservative.

Dose calculated for maximum external air dose (gamma-air and beta-air) are made for points at and beyond the unrestricted area boundary as described in the BFN ODCM. The highest of these doses is then selected.

External doses to the skin and total body, due to submersion in a cloud of noble gases, are calculated for the nearest residence in each sector. The residence with the highest dose is then selected from all sectors.

Dose to an organ due to releases of airborne effluents are estimated for the inhalation, ground contamination, and ingestion pathways. The ingestion pathway is further divided into three possible contributing pathways: ingestion of cow/goat milk, ingestion of beef, and ingestion of vegetables. Doses from applicable pathways are calculated for each receptor location identified in the most recent land use survey. To determine the maximum organ dose, the doses from the pathways are summed for each receptor. However, for the ingestion dose, only those pathways that exist for each receptor are considered in the sum, e.g., milk ingestion doses are included only for locations where milk was consumed without commercial preparation and vegetable ingestion is included only for those locations where a garden was identified. To conservatively account for beef ingestion, a beef ingestion dose equal to that for the highest unrestricted area boundary location is added to each identified receptor. For ground contamination, the dose added to the organ dose being calculated is the total body dose calculated for that location, i.e., it is assumed that the dose to an individual organ is equal to the total body dose.

The maximum organ dose, thyroid dose, and total body dose from airborne effluents are presented in Table 3.

E. Doses from Liquid Effluents For liquid effluents, the public can be exposed to radiation from three sources: the ingestion of water from the Tennessee River, the ingestion of fish caught in the Tennessee River, and direct exposure from radioactive material deposited on the river shoreline

Browns Ferry Nuclear Plant Units 1, 2 and 3 2024 Annual Radioactive Effluent Release Report Radiological Impact Page 29 of 68 sediment (recreation). The concentration of radionuclides in the Tennessee River is calculated by a computer model which uses measured hydraulic data downstream of BFN.

Parameters used to determine the doses are based on guidance given by the NRC for maximum ingestion rates, exposure times, etc.

Wherever possible, parameters used in the dose calculation are site specific. The models that are used to estimate doses, as well as the parameters input to the models, are described in detail in the BFN ODCM.

Radionuclide concentrations in the Tennessee River are calculated assuming that releases in liquid effluents are continuous. When necessary, liquid releases from BFN, located at Tennessee River Mile 294, are made through diffusers which extend into the Tennessee River. It is assumed that releases to the river through these diffusers will initially be entrained in one-fifth of the water which flows past the plant. The QWATA code makes the assumption that this mixing condition holds true until the water is completely mixed at the first downstream dam (Wheeler Dam), at Tennessee River Mile 283.

Doses are calculated for locations within a 50 mile radius downstream of the plant site.

The maximum potential recreation dose is calculated for a location immediately downstream from the plants release point. The maximum exposed individual dose from ingestion of fish is assumed to be that calculated for the consumption of fish caught anywhere between the plant and the first downstream dam. The maximum exposed individual dose from drinking water is assumed to be that calculated at the nearest downstream public water supply [West Morgan - East Lawrence (WMEL)]. This could be interpreted as indicating that the maximum exposed individual, as assumed for liquid releases from BFN, is an individual who obtains all drinking water at WMEL, consumes fish caught from the Tennessee River between BFN and Wheeler Dam, and spends 500 hours0.00579 days 0.139 hours 8.267196e-4 weeks 1.9025e-4 months per year on the shoreline just downstream of the plants release point. Doses calculated for the maximum exposed individual due to liquid effluents for each quarter in the period are presented in Table 4 along with the average river flows past the plant site for the periods.

F. Population Doses Population doses due to airborne effluents are calculated for people living within a 50-mile radius of the plant site. Doses from external pathways and inhalation are based on the 50-mile human population distribution. Ingestion population doses are calculated assuming that each individual consumed milk, vegetables, and meat produced within the sector in which the individual resides.

Population doses due to liquid effluents are calculated for the entire downstream Tennessee River population. Water ingestion population doses are calculated using actual population figures for downstream public water supplies. Fish ingestion population doses are calculated assuming that all sport fish caught in the Tennessee River are consumed by the Tennessee River population. Recreation population doses are calculated using historical

Browns Ferry Nuclear Plant Units 1, 2 and 3 2024 Annual Radioactive Effluent Release Report Radiological Impact Page 30 of 68 recreational data on the number of shoreline visits at downstream locations. Population doses calculated for airborne and liquid effluents are presented in Tables 3 and 4.

G. Offsite Direct Radiation Dose External gamma radiation levels were measured by environmental dosimeters deployed around BFN as part of the 2024 Radiological Environmental Monitoring Program (REMP). The 2024 environmental dosimeters were evaluated in accordance with the guidance provided in ANSI N13.37. The process of this evaluation is summarized: 1) The average field dosimeter results is determined for each location and normalized to a standard quarter of 91 days, 2)

The field results is adjusted by the transit and shield (storage) dose to determine the net dose at each location; this is performed at each location for each quarter, and the four quarters are summed to determine the annual net dose, 3) The quarterly and annual historical average net dose was determined for each monitoring location, 4) The standard deviation of each historical net dose was calculated, to determine the 90th percentile standard deviation for both the quarterly and annual results, 5) the 2024 quarterly and annual net dose are compared to the historical averages (plus 3 times the 90th percentile standard deviation, also known as the minimum differential dose) to determine if any facility related dose was identified at any location during any quarter or the year. Baseline adjusted dose reflect evaluation in accordance with ANSI N13.37, where facility dose is only recorded if the measurement exceeds the baseline plus Minimum Differential Dose (MDD)

The monitoring locations are grouped according to the distance from the plant. The onsite group consists of dosimeters within 2 miles of the plant. The offsite group consists of all locations greater than 2 miles from the plant. This difference in onsite and offsite averages is consistent with levels measured for preoperational and construction phases at BFN where the average radiation levels onsite were generally 2-6 mrem/quarter higher than the levels offsite. This may be attributed to natural variations in environmental radiation levels, earth moving activities onsite, the mass of concrete employed in the construction of the plant, or other undermined influences. In order to implement the methodology of ANSI N13.37, the dose received by dosimeters in shielded storage that are used as unexposed controls was determined. This in turn was used to account for extraneous dose that should be removed from the gross measurements as measured by field dosimeters.

The result of the evaluation of environmental dosimeters is that there was no facility related dose measured in the environment around Browns Ferry. There were no quarterly or annual dosimeters that exceed the historical baseline plus the calculated minimum differential dose.

H. Dose to a Member of the Public Inside the Site Boundary Pursuant to ODCM Section 7.7.5, a review was performed to determine the highest dose to a member of the public inside the site boundary. The dose to a member of the public consists of the sum of dose commitments from effluent releases as well as any direct radiation dose. The gaseous effluent dose commitment is negligible compared to the direct radiation dose.

The direct radiation dose was determined from area environmental dosimeters located on-site. The critical location was determined to be an Optically Stimulated Luminescence

Browns Ferry Nuclear Plant Units 1, 2 and 3 2024 Annual Radioactive Effluent Release Report Radiological Impact Page 31 of 68 (OSL) dosimeter near the Livewell Center (SE-1). The annual background baseline is 79.5 mrem/yr at the Livewell Center and the 2024 annual field dose was 79.3 mrem/yr. The direct radiation dose at the Livewell Center, accounting for background and occupancy factor, was determined to be non-detectable as this location. The annual net dose was non-detectable for a Member of Public inside the Site Boundary, which is below the 10 CR 20 annual limit of 100 mrem.

I. Total Dose To determine compliance with 40 CFR 190, annual total dose contributions to the maximum exposed individual from BFN radioactive effluents and all other nearby uranium fuel cycle sources are considered.

The annual dose to any organ other than the thyroid for the maximum exposed individual is conservatively calculated by summing the following doses: the total body air submersion dose for each quarter, the critical organ dose (for any organ other than the thyroid) from airborne effluents for each quarter from ground contamination, inhalation and ingestion, the total body dose from liquid effluents for each quarter, the maximum organ dose (for any organ other than the thyroid) from liquid effluents for each quarter, and any identifiable increase in direct radiation dose levels as measured by the REMP. This dose is compared to the 40 CFR 190 limit for total body or any organ dose (other than the thyroid) to determine compliance.

The annual thyroid dose to the maximum exposed individual is conservatively estimated by summing the following doses: the total body air submersion dose for each quarter, the thyroid dose from airborne effluents for each quarter, the total body dose from liquid effluents for each quarter, the thyroid dose from liquid effluents for each quarter, and any identifiable increase in direct radiation dose levels as measured by the REMP. This dose is compared to the 40 CFR 190 limit for thyroid dose to determine compliance.

Total dose from the fuel cycle is presented in Table 5.

Browns Ferry Nuclear Plant Units 1, 2 and 3 2024 Annual Radioactive Effluent Release Report Radiological Impact Page 32 of 68 J. Tables Table 3-A Doses from Airborne Effluents - 1st Quarter1 Individual Doses Pathway Dose Quarterly Limit Percent of Limit Location Gamma Air 0.00E+00 mrad 5 mrad

< 1%

NA Beta Air 0.00E+00 mrad 10 mrad

< 1%

NA NG Total Body 1.81E-04 mrad NA NA NNW 1650 meters NG Skin 2.13E-04 mrad NA NA NNW 1650 meters Organ Doses (Iodine, Tritium, Particulates with >8-Day half-life)

Child / Thyroid 6.70E-03 mrem 7.5 mrem

< 1%

NNW 5990 meters Child / Total Body 6.71E-03 mrem 7.5 mrem

< 1%

NNW 5990 meters Child / Bone 2.41E-02 mrem 7.5 mrem

< 1%

NNW 5990 meters Population Doses Total Body Dose 2.01E-01 man-rem Maximum Organ Dose 8.66E-01 man-rem (Bone)

Table 3-B Doses from Airborne Effluents - 2nd Quarter1 Individual Doses Pathway Dose Quarterly Limit Percent of Limit Location Gamma Air 0.00E+00 mrad 5 mrad

< 1%

NA Beta Air 0.00E+00 mrad 10 mrad

< 1%

NA NG Total Body 7.52E-05 mrad NA NA NNW 1650 meters NG Skin 8.85E-05 mrad NA NA NNW 1650 meters Organ Doses (Iodine, Tritium, Particulates with >8-Day half-life)

Child / Thyroid 6.39E-03 mrem 7.5 mrem

< 1%

NNW 5990 meters Child / Total Body 6.35E-03 mrem 7.5 mrem

< 1%

NNW 5990 meters Child / Bone 2.65E-02 mrem 7.5 mrem

< 1%

NNW 5990 meters Population Doses Total Body Dose 2.11E-01 man-rem Maximum Organ Dose 9.73E-01 man-rem (Bone) 1 Includes dose from abnormal gaseous releases.

Browns Ferry Nuclear Plant Units 1, 2 and 3 2024 Annual Radioactive Effluent Release Report Radiological Impact Page 33 of 68 Table 3-C Doses from Airborne Effluents - 3rd Quarter1 Individual Doses Pathway Dose Quarterly Limit Percent of Limit Location Gamma Air 8.73E-07 mrad 5 mrad

< 1%

NNW 5500 meters Beta Air 3.08E-07 mrad 10 mrad

< 1%

NNW 5500 meters NG Total Body 2.46E-04 mrad NA NA NNW 1650 meters NG Skin 2.89E-04 mrad NA NA NNW 1650 meters Organ Doses (Iodine, Tritium, Particulates with >8-Day half-life)

Child / Thyroid 7.26E-03 mrem 7.5 mrem

< 1%

NNW 5990 meters Child / Total Body 7.26E-03 mrem 7.5 mrem

< 1%

NNW 5990 meters Child / Bone 2.62E-02 mrem 7.5 mrem

< 1%

NNW 5990 meters Population Doses Total Body Dose 2.17E-01 man-rem Maximum Organ Dose 9.39E-01 man-rem (Bone)

Table 3-D Doses from Airborne Effluents - 4th Quarter1 Individual Doses Pathway Dose Quarterly Limit Percent of Limit Location Gamma Air 0.00E+00 mrad 5 mrad

< 1%

NA Beta Air 0.00E+00 mrad 10 mrad

< 1%

NA NG Total Body 6.08E-04 mrad NA NA NNW 1650 meters NG Skin 7.15E-04 mrad NA NA NNW 1650 meters Organ Doses (Iodine, Tritium, Particulates with >8-Day half-life)

Child / Thyroid 6.24E-03 mrem 7.5 mrem

< 1%

NNW 5990 meters Child / Total Body 6.30E-03 mrem 7.5 mrem

< 1%

NNW 5990 meters Child / Bone 2.70E-02 mrem 7.5 mrem

< 1%

NNW 5990 meters Population Doses Total Body Dose 2.14E-01 man-rem Maximum Organ Dose 9.98E-01 man-rem (Bone) 1 Includes dose from abnormal gaseous releases.

Browns Ferry Nuclear Plant Units 1, 2 and 3 2024 Annual Radioactive Effluent Release Report Radiological Impact Page 34 of 68 Table 4-A Doses from Liquid Effluents - 1st Quarter Individual Doses Age Group Organ Dose Quarterly Limit Percent of Limit Teen Liver 9.82E-05 mrem 5 mrem

< 1%

Child Thyroid 7.28E-05 mrem 5 mrem

< 1%

Adult Total Body 8.99E-05 mrem 1.5 mrem

< 1%

Average River Flow Past BFN: 63,831 CFS Population Doses Total Body Dose 7.20e-03 man-rem Maximum Organ Dose 7.30E-03 man-rem (Liver)

Table 4-B Doses from Liquid Effluents - 2nd Quarter Individual Doses Age Group Organ Dose Quarterly Limit Percent of Limit Child Bone 2.96E-05 mrem 5 mrem

< 1%

Child Thyroid 1.92E-05 mrem 5 mrem

< 1%

Adult Total Body 2.56E-05 mrem 1.5 mrem

< 1%

Average River Flow Past BFN: 30,555 CFS Population Doses Total Body Dose 1.70E-03 man-rem Maximum Organ Dose 1.80E-03 man-rem (Liver)

Browns Ferry Nuclear Plant Units 1, 2 and 3 2024 Annual Radioactive Effluent Release Report Radiological Impact Page 35 of 68 Table 4-C Doses from Liquid Effluents - 3rd Quarter Individual Doses Age Group Organ Dose Quarterly Limit Percent of Limit Adult GIT 7.84E-05 mrem 5 mrem

< 1%

Child Thyroid 6.79E-05 mrem 5 mrem

< 1%

Child Total Body 7.01E-05 mrem 1.5 mrem

< 1%

Average River Flow Past BFN: 23,291 CFS Population Doses Total Body Dose 7.00E-03 man-rem Maximum Organ Dose 7.10E-03 man-rem (GIT)

Table 4-D Doses from Liquid Effluents - 4th Quarter Individual Doses Age Group Organ Dose Quarterly Limit Percent of Limit Adult GIT 3.11E-04 mrem 5 mrem

< 1%

Child Thyroid 2.21E-04 mrem 5 mrem

< 1%

Adult Total Body 2.75E-04 mrem 1.5 mrem

< 1%

Average River Flow Past BFN: 36,124 CFS Population Doses Total Body Dose 2.30E-02 man-rem Maximum Organ Dose 2.40E-02 man-rem (GIT)

Browns Ferry Nuclear Plant Units 1, 2 and 3 2024 Annual Radioactive Effluent Release Report Radiological Impact Page 36 of 68 Table 4-E Total Dose from I-131 Water Ingestion Individual Doses First Quarter Second Quarter Third Quarter Fourth Quarter Total I-131 (Ci)

< LLD

< LLD Thyroid (mrem)

NA NA NA NA NA Population Thyroid (mrem)

NA NA NA NA NA The REMP requirements as specified in Table 3.12-1 from NUREG 1302, Offsite Dose Calculation Manual Guidance: Standard Radiological Effluent Controls for Boiling Water Reactors, dated April 1991, requires an I-131 specific analysis for drinking water pathway samples if the annual dose from I-131 is greater than 1 mrem. In order to evaluate the need for implementation of this additional analysis, the drinking water pathway dose from I-131 to the maximum organ and age group is calculated. Based on Table 4-E above, the performance of the I-131 specific analysis is not required for BFN REMP drinking water samples in 2024, as I-131 was not identified in any liquid effluent from the plant.

Browns Ferry Nuclear Plant Units 1, 2 and 3 2024 Annual Radioactive Effluent Release Report Radiological Impact Page 37 of 68 Table 5 Total Dose from Fuel Cycle Dose First Quarter Second Quarter Third Quarter Fourth Quarter Total Body or any Organ (except thyroid)

Total body air (submersion) 1.81E-04 7.52E-05 2.46E-04 6.08E-04 Critical organ dose (airborne) 2.41E-02 2.65E-02 2.62E-02 2.70E-02 Total body dose (liquid) 8.99E-05 2.56E-05 7.01E-05 2.75E-04 Maximum organ dose (liquid) 9.82E-05 2.96E-05 7.84E-05 3.11E-04 Direct Radiation Dose 0.00E+00 0.00E+00 0.00E+00 0.00E+00 Total 2.45E-02 2.66E-02 2.66E-02 2.82E-02 Cumulative Total Dose (mrem) 1.06E-01 Annual Dose Limit (mrem) 25 Percent of Limit

< 1%

Thyroid Total body air (submersion) 1.81E-04 7.52E-05 2.46E-04 6.08E-04 Thyroid dose (airborne) 6.70E-03 6.39E-03 7.26E-03 6.24E-03 Total body dose (liquid) 8.99E-05 2.56E-05 7.01E-05 2.75E-04 Thyroid dose (liquid) 7.28E-05 1.92E-05 6.79E-05 2.21E-04 Total 7.04E-03 6.51E-03 7.64E-03 7.34E-03 Cumulative Total Dose (mrem) 2.85E-02 Annual Dose Limit (mrem) 75 Percent of Limit

< 1%

Browns Ferry Nuclear Plant Units 1, 2 and 3 2024 Annual Radioactive Effluent Release Report Meteorological Data Page 38 of 68 VII. Meteorological Data Table 6 - Ground Level Releases 2009 - 2018 Joint Frequency Distribution In Percent

Browns Ferry Nuclear Plant Units 1, 2 and 3 2024 Annual Radioactive Effluent Release Report Meteorological Data Page 39 of 68 JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS A (DELTA T<=-1.9 C/100 M)

BROWNS FERRY NUCLEAR PLANT JAN 1, 2009 - DEC 31, 2018 WIND WIND SPEED(MPH)

DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.000 0.000 0.006 0.054 0.338 0.013 0.000 0.000 0.411 NNE 0.000 0.000 0.001 0.009 0.046 0.233 0.004 0.000 0.000 0.292 NE 0.000 0.000 0.001 0.002 0.013 0.062 0.011 0.000 0.000 0.089 ENE 0.000 0.000 0.002 0.002 0.015 0.002 0.000 0.000 0.000 0.022 E 0.000 0.000 0.007 0.030 0.006 0.001 0.000 0.000 0.000 0.044 ESE 0.000 0.000 0.037 0.185 0.123 0.012 0.000 0.000 0.000 0.357 SE 0.000 0.000 0.333 0.762 0.094 0.009 0.001 0.000 0.000 1.199 SSE 0.000 0.000 0.684 0.463 0.000 0.000 0.000 0.000 0.000 1.148 S 0.000 0.000 0.586 0.366 0.033 0.005 0.000 0.000 0.000 0.990 SSW 0.000 0.000 0.267 0.322 0.023 0.001 0.000 0.000 0.000 0.613 SW 0.000 0.000 0.053 0.145 0.011 0.001 0.000 0.000 0.000 0.209 WSW 0.000 0.000 0.020 0.167 0.046 0.025 0.000 0.000 0.000 0.257 W 0.000 0.000 0.001 0.083 0.133 0.112 0.002 0.000 0.000 0.332 WNW 0.000 0.000 0.004 0.012 0.041 0.195 0.066 0.001 0.000 0.318 NW 0.000 0.000 0.001 0.004 0.026 0.197 0.115 0.011 0.000 0.352 NNW 0.000 0.000 0.001 0.000 0.032 0.212 0.078 0.006 0.000 0.329 SUBTOTAL 0.000 0.000 1.999 2.559 0.694 1.405 0.289 0.018 0.000 6.963 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 85593 TOTAL HOURS OF STABILITY CLASS A 5957 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS A 5952 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 85479 TOTAL HOURS CALM 0 METEOROLOGICAL FACILITY: BROWNS FERRY NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 10.03 AND 45.30 METERS WIND SPEED AND DIRECTION MEASURED AT 10.50 METER LEVEL DATE PRINTED: 2021/06/29 MEAN WIND SPEED = 5.57 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS

Browns Ferry Nuclear Plant Units 1, 2 and 3 2024 Annual Radioactive Effluent Release Report Meteorological Data Page 40 of 68 JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS B (-1.9< DELTA T<=-1.7 C/100 M)

BROWNS FERRY NUCLEAR PLANT JAN 1, 2009 - DEC 31, 2018 WIND WIND SPEED(MPH)

DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.000 0.001 0.026 0.104 0.186 0.002 0.000 0.000 0.319 NNE 0.000 0.000 0.001 0.014 0.116 0.145 0.001 0.000 0.000 0.277 NE 0.000 0.000 0.002 0.015 0.056 0.062 0.004 0.000 0.000 0.139 ENE 0.000 0.000 0.002 0.014 0.014 0.005 0.000 0.000 0.000 0.035 E 0.000 0.000 0.002 0.011 0.008 0.000 0.000 0.000 0.000 0.021 ESE 0.000 0.000 0.021 0.157 0.054 0.006 0.000 0.000 0.000 0.237 SE 0.000 0.000 0.220 0.219 0.019 0.001 0.000 0.000 0.000 0.459 SSE 0.000 0.002 0.252 0.073 0.000 0.000 0.000 0.000 0.000 0.326 S 0.000 0.000 0.230 0.094 0.009 0.000 0.000 0.000 0.000 0.333 SSW 0.000 0.000 0.181 0.110 0.005 0.000 0.000 0.000 0.000 0.296 SW 0.000 0.000 0.084 0.080 0.004 0.001 0.000 0.000 0.000 0.168 WSW 0.000 0.000 0.023 0.187 0.041 0.014 0.000 0.000 0.000 0.266 W 0.000 0.000 0.009 0.157 0.157 0.078 0.005 0.000 0.000 0.406 WNW 0.000 0.000 0.001 0.035 0.099 0.259 0.089 0.005 0.000 0.488 NW 0.000 0.000 0.000 0.016 0.082 0.260 0.092 0.007 0.000 0.457 NNW 0.000 0.000 0.000 0.019 0.062 0.171 0.034 0.000 0.000 0.285 SUBTOTAL 0.000 0.002 1.032 1.225 0.829 1.187 0.227 0.012 0.000 4.515 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 85593 TOTAL HOURS OF STABILITY CLASS B 3864 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS B 3859 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 85479 TOTAL HOURS CALM 0 METEOROLOGICAL FACILITY: BROWNS FERRY NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 10.03 AND 45.30 METERS WIND SPEED AND DIRECTION MEASURED AT 10.50 METER LEVEL DATE PRINTED: 2021/06/29 MEAN WIND SPEED = 6.22 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS

Browns Ferry Nuclear Plant Units 1, 2 and 3 2024 Annual Radioactive Effluent Release Report Meteorological Data Page 41 of 68 JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS C (-1.7< DELTA T<=-1.5 C/100 M)

BROWNS FERRY NUCLEAR PLANT JAN 1, 2009 - DEC 31, 2018 WIND WIND SPEED(MPH)

DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.000 0.006 0.075 0.149 0.123 0.004 0.000 0.000 0.356 NNE 0.000 0.000 0.008 0.058 0.152 0.094 0.001 0.000 0.000 0.314 NE 0.000 0.000 0.002 0.033 0.055 0.073 0.002 0.000 0.000 0.165 ENE 0.000 0.000 0.004 0.021 0.013 0.005 0.000 0.000 0.000 0.042 E 0.000 0.000 0.013 0.037 0.018 0.002 0.000 0.000 0.000 0.070 ESE 0.000 0.000 0.044 0.124 0.060 0.006 0.000 0.000 0.000 0.234 SE 0.000 0.001 0.275 0.156 0.014 0.004 0.000 0.000 0.000 0.449 SSE 0.000 0.000 0.323 0.062 0.001 0.000 0.000 0.000 0.000 0.386 S 0.000 0.000 0.315 0.076 0.004 0.000 0.000 0.000 0.000 0.394 SSW 0.000 0.000 0.212 0.111 0.009 0.000 0.000 0.000 0.000 0.332 SW 0.000 0.000 0.179 0.083 0.005 0.000 0.000 0.000 0.000 0.267 WSW 0.000 0.000 0.096 0.178 0.035 0.021 0.000 0.000 0.000 0.330 W 0.000 0.000 0.029 0.275 0.173 0.095 0.005 0.000 0.000 0.577 WNW 0.000 0.000 0.006 0.085 0.146 0.311 0.089 0.007 0.000 0.645 NW 0.000 0.000 0.001 0.062 0.113 0.270 0.089 0.011 0.000 0.546 NNW 0.000 0.000 0.005 0.036 0.101 0.194 0.025 0.000 0.000 0.360 SUBTOTAL 0.000 0.001 1.517 1.473 1.047 1.197 0.214 0.018 0.000 5.467 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 85593 TOTAL HOURS OF STABILITY CLASS C 4674 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS C 4673 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 85479 TOTAL HOURS CALM 0 METEOROLOGICAL FACILITY: BROWNS FERRY NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 10.03 AND 45.30 METERS WIND SPEED AND DIRECTION MEASURED AT 10.50 METER LEVEL DATE PRINTED: 2021/06/29 MEAN WIND SPEED = 5.83 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS

Browns Ferry Nuclear Plant Units 1, 2 and 3 2024 Annual Radioactive Effluent Release Report Meteorological Data Page 42 of 68 JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS D (-1.5< DELTA T<=-0.5 C/100 M)

BROWNS FERRY NUCLEAR PLANT JAN 1, 2009 - DEC 31, 2018 WIND WIND SPEED(MPH)

DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.012 0.227 0.645 0.755 0.631 0.020 0.000 0.000 2.288 NNE 0.000 0.006 0.264 0.661 0.683 0.468 0.012 0.000 0.000 2.094 NE 0.000 0.008 0.273 0.503 0.443 0.322 0.014 0.000 0.000 1.563 ENE 0.000 0.005 0.257 0.365 0.179 0.055 0.001 0.000 0.000 0.862 E 0.000 0.016 0.407 0.572 0.152 0.034 0.000 0.000 0.000 1.182 ESE 0.000 0.022 0.723 0.969 0.422 0.102 0.000 0.000 0.000 2.238 SE 0.000 0.035 1.171 0.406 0.108 0.040 0.000 0.000 0.000 1.760 SSE 0.000 0.040 1.328 0.208 0.005 0.002 0.000 0.000 0.000 1.583 S 0.000 0.057 1.487 0.345 0.094 0.019 0.000 0.000 0.000 2.002 SSW 0.000 0.033 1.446 0.400 0.076 0.015 0.000 0.000 0.000 1.970 SW 0.000 0.033 0.792 0.157 0.036 0.009 0.000 0.000 0.000 1.027 WSW 0.000 0.013 0.877 0.565 0.153 0.080 0.006 0.000 0.000 1.694 W 0.000 0.012 0.525 1.095 0.708 0.491 0.061 0.002 0.000 2.894 WNW 0.000 0.008 0.183 0.453 0.519 0.902 0.408 0.068 0.001 2.542 NW 0.000 0.001 0.137 0.414 0.584 1.363 0.759 0.075 0.001 3.334 NNW 0.000 0.004 0.208 0.466 0.729 1.201 0.243 0.002 0.000 2.853 SUBTOTAL 0.001 0.304 10.305 8.223 5.646 5.734 1.524 0.147 0.002 31.887 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 85593 TOTAL HOURS OF STABILITY CLASS D 27284 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS D 27257 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 85479 TOTAL HOURS CALM 1 METEOROLOGICAL FACILITY: BROWNS FERRY NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 10.03 AND 45.30 METERS WIND SPEED AND DIRECTION MEASURED AT 10.50 METER LEVEL DATE PRINTED: 2021/06/29 MEAN WIND SPEED = 5.57 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS

Browns Ferry Nuclear Plant Units 1, 2 and 3 2024 Annual Radioactive Effluent Release Report Meteorological Data Page 43 of 68 JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS E (-0.5< DELTA T<= 1.5 C/100 M)

BROWNS FERRY NUCLEAR PLANT JAN 1, 2009 - DEC 31, 2018 WIND WIND SPEED(MPH)

DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.077 0.822 0.590 0.233 0.097 0.007 0.000 0.000 1.827 NNE 0.000 0.071 0.614 0.749 0.385 0.135 0.001 0.000 0.000 1.955 NE 0.000 0.105 0.461 0.397 0.281 0.147 0.002 0.000 0.000 1.394 ENE 0.000 0.142 0.746 0.383 0.087 0.014 0.002 0.000 0.000 1.374 E 0.001 0.177 1.399 0.875 0.076 0.015 0.000 0.000 0.000 2.543 ESE 0.001 0.199 1.434 1.088 0.256 0.048 0.004 0.000 0.000 3.030 SE 0.001 0.262 1.026 0.477 0.165 0.035 0.000 0.000 0.000 1.966 SSE 0.001 0.294 1.172 0.197 0.011 0.002 0.000 0.000 0.000 1.676 S 0.001 0.255 1.416 0.667 0.359 0.119 0.000 0.000 0.000 2.817 SSW 0.000 0.207 0.852 0.343 0.158 0.071 0.001 0.000 0.000 1.632 SW 0.000 0.154 0.471 0.082 0.014 0.009 0.000 0.000 0.000 0.731 WSW 0.000 0.101 0.673 0.188 0.054 0.013 0.002 0.000 0.000 1.031 W 0.000 0.078 0.662 0.606 0.170 0.075 0.005 0.000 0.000 1.596 WNW 0.000 0.047 0.220 0.153 0.124 0.115 0.025 0.002 0.000 0.686 NW 0.000 0.049 0.228 0.257 0.252 0.328 0.066 0.005 0.000 1.184 NNW 0.000 0.049 0.622 0.687 0.483 0.325 0.020 0.000 0.000 2.187 SUBTOTAL 0.007 2.267 12.820 7.738 3.106 1.549 0.135 0.007 0.000 27.628 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 85593 TOTAL HOURS OF STABILITY CLASS E 23651 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS E 23616 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 85479 TOTAL HOURS CALM 6 METEOROLOGICAL FACILITY: BROWNS FERRY NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 10.03 AND 45.30 METERS WIND SPEED AND DIRECTION MEASURED AT 10.50 METER LEVEL DATE PRINTED: 2021/06/29 MEAN WIND SPEED = 3.71 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS

Browns Ferry Nuclear Plant Units 1, 2 and 3 2024 Annual Radioactive Effluent Release Report Meteorological Data Page 44 of 68 JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS F ( 1.5< DELTA T<= 4.0 C/100 M)

BROWNS FERRY NUCLEAR PLANT JAN 1, 2009 - DEC 31, 2018 WIND WIND SPEED(MPH)

DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.002 0.161 1.255 0.519 0.040 0.001 0.000 0.000 0.000 1.979 NNE 0.001 0.150 0.646 0.537 0.109 0.007 0.001 0.000 0.000 1.451 NE 0.001 0.179 0.370 0.158 0.062 0.019 0.001 0.000 0.000 0.789 ENE 0.001 0.219 0.717 0.212 0.016 0.000 0.000 0.000 0.000 1.165 E 0.002 0.266 1.128 0.366 0.000 0.001 0.000 0.000 0.000 1.763 ESE 0.001 0.219 0.738 0.111 0.002 0.001 0.000 0.000 0.000 1.073 SE 0.001 0.278 0.641 0.120 0.019 0.004 0.000 0.000 0.000 1.064 SSE 0.002 0.277 0.785 0.098 0.011 0.000 0.000 0.000 0.000 1.173 S 0.001 0.151 0.586 0.447 0.195 0.060 0.000 0.000 0.000 1.440 SSW 0.000 0.091 0.227 0.082 0.027 0.011 0.000 0.000 0.000 0.438 SW 0.000 0.060 0.111 0.011 0.000 0.002 0.000 0.000 0.000 0.184 WSW 0.000 0.047 0.083 0.006 0.002 0.000 0.000 0.000 0.000 0.138 W 0.000 0.061 0.084 0.015 0.004 0.002 0.000 0.000 0.000 0.166 WNW 0.000 0.062 0.077 0.011 0.005 0.005 0.005 0.001 0.000 0.165 NW 0.000 0.080 0.159 0.046 0.008 0.004 0.001 0.000 0.000 0.297 NNW 0.001 0.116 0.518 0.296 0.071 0.006 0.000 0.000 0.000 1.008 SUBTOTAL 0.015 2.416 8.126 3.035 0.571 0.122 0.008 0.001 0.000 14.294 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 85593 TOTAL HOURS OF STABILITY CLASS F 12227 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS F 12218 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 85479 TOTAL HOURS CALM 13 METEOROLOGICAL FACILITY: BROWNS FERRY NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 10.03 AND 45.30 METERS WIND SPEED AND DIRECTION MEASURED AT 10.50 METER LEVEL DATE PRINTED: 2021/06/29 MEAN WIND SPEED = 2.78 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS

Browns Ferry Nuclear Plant Units 1, 2 and 3 2024 Annual Radioactive Effluent Release Report Meteorological Data Page 45 of 68 JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS G (DELTA T > 4.0 C/100 M)

BROWNS FERRY NUCLEAR PLANT JAN 1, 2009 - DEC 31, 2018 WIND WIND SPEED(MPH)

DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.009 0.714 1.008 0.328 0.000 0.000 0.000 0.000 0.000 2.059 NNE 0.006 0.509 0.528 0.145 0.006 0.007 0.001 0.000 0.000 1.201 NE 0.004 0.346 0.450 0.040 0.009 0.012 0.000 0.000 0.000 0.862 ENE 0.004 0.230 0.503 0.073 0.004 0.000 0.000 0.000 0.000 0.814 E 0.002 0.174 0.287 0.035 0.000 0.000 0.000 0.000 0.000 0.499 ESE 0.002 0.158 0.140 0.008 0.000 0.000 0.000 0.000 0.000 0.308 SE 0.002 0.204 0.174 0.021 0.001 0.000 0.000 0.000 0.000 0.402 SSE 0.005 0.290 0.653 0.058 0.002 0.000 0.000 0.000 0.000 1.009 S 0.003 0.102 0.384 0.130 0.037 0.004 0.000 0.000 0.000 0.659 SSW 0.000 0.064 0.023 0.005 0.000 0.000 0.000 0.000 0.000 0.093 SW 0.000 0.026 0.005 0.002 0.002 0.000 0.000 0.000 0.000 0.035 WSW 0.000 0.026 0.005 0.002 0.000 0.000 0.000 0.000 0.000 0.033 W 0.000 0.026 0.011 0.001 0.002 0.000 0.000 0.000 0.000 0.040 WNW 0.000 0.037 0.015 0.001 0.000 0.000 0.000 0.000 0.000 0.054 NW 0.001 0.154 0.060 0.007 0.000 0.000 0.000 0.000 0.000 0.222 NNW 0.005 0.487 0.415 0.048 0.002 0.000 0.000 0.000 0.000 0.957 SUBTOTAL 0.044 3.547 4.661 0.904 0.067 0.022 0.001 0.000 0.000 9.247 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 85593 TOTAL HOURS OF STABILITY CLASS G 7936 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS G 7904 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 85479 TOTAL HOURS CALM 38 METEOROLOGICAL FACILITY: BROWNS FERRY NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 10.03 AND 45.30 METERS WIND SPEED AND DIRECTION MEASURED AT 10.50 METER LEVEL DATE PRINTED: 2021/06/29 MEAN WIND SPEED = 2.01 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS

Browns Ferry Nuclear Plant Units 1, 2 and 3 2024 Annual Radioactive Effluent Release Report Meteorological Data Page 46 of 68 Table 7 - Split Level Releases 2009 - 2018 Joint Frequency Distribution In Percent (Ground Level Release Mode and Elevated Release Mode)

Browns Ferry Nuclear Plant Units 1, 2 and 3 2024 Annual Radioactive Effluent Release Report Meteorological Data Page 47 of 68 SPLIT JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS A (DELTA T<=-1.9 C/100 M)

BROWNS FERRY NUCLEAR PLANT PART 1 OF 2 GROUND LEVEL RELEASE MODE JAN 1, 2009 - DEC 31, 2018 WIND WIND SPEED(MPH)

DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.000 0.000 0.000 0.005 0.056 0.005 0.000 0.000 0.067 NNE 0.000 0.000 0.000 0.000 0.004 0.037 0.001 0.000 0.000 0.043 NE 0.000 0.000 0.000 0.000 0.001 0.010 0.002 0.000 0.000 0.013 ENE 0.000 0.000 0.001 0.000 0.001 0.000 0.000 0.000 0.000 0.002 E 0.000 0.000 0.001 0.002 0.001 0.000 0.000 0.000 0.000 0.004 ESE 0.000 0.000 0.004 0.022 0.022 0.004 0.000 0.000 0.000 0.052 SE 0.000 0.000 0.020 0.069 0.021 0.002 0.001 0.000 0.000 0.114 SSE 0.000 0.000 0.039 0.034 0.000 0.000 0.000 0.000 0.000 0.072 S 0.000 0.000 0.044 0.035 0.009 0.003 0.000 0.000 0.000 0.091 SSW 0.000 0.000 0.022 0.034 0.005 0.000 0.000 0.000 0.000 0.062 SW 0.000 0.000 0.002 0.008 0.002 0.000 0.000 0.000 0.000 0.012 WSW 0.000 0.000 0.001 0.011 0.006 0.004 0.000 0.000 0.000 0.021 W 0.000 0.000 0.000 0.003 0.013 0.017 0.001 0.000 0.000 0.033 WNW 0.000 0.000 0.000 0.000 0.003 0.029 0.016 0.001 0.000 0.049 NW 0.000 0.000 0.000 0.000 0.002 0.030 0.026 0.008 0.000 0.066 NNW 0.000 0.000 0.000 0.000 0.003 0.035 0.023 0.005 0.000 0.066 SUBTOTAL 0.000 0.000 0.134 0.218 0.097 0.229 0.076 0.013 0.000 0.768 TOTAL HOURS OF VALID OBSERVATIONS 85083.000 TOTAL HOURS OF GROUND LEVEL RELEASE 8848.910 TOTAL HOURS OF STABILITY CLASS A 1295.800 TOTAL HOURS OF GROUND LEVEL STABILITY CLASS A 653.750 METEOROLOGICAL FACILITY: BROWNS FERRY NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 10.03 AND 45.30 METERS WIND DIRECTION MEASURED AT 10.50 METER LEVEL WIND SPEED MEASURED AT 10.50 METER LEVEL EFFLUENT VELOCITY = 12.60 M/S DATE PRINTED: 2021/06/29 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS

Browns Ferry Nuclear Plant Units 1, 2 and 3 2024 Annual Radioactive Effluent Release Report Meteorological Data Page 48 of 68 SPLIT JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS B (-1.9< DELTA T<=-1.7 C/100 M)

BROWNS FERRY NUCLEAR PLANT PART 1 OF 2 GROUND LEVEL RELEASE MODE JAN 1, 2009 - DEC 31, 2018 WIND WIND SPEED(MPH)

DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.000 0.000 0.000 0.010 0.030 0.001 0.000 0.000 0.041 NNE 0.000 0.000 0.000 0.000 0.010 0.021 0.000 0.000 0.000 0.032 NE 0.000 0.000 0.000 0.000 0.005 0.009 0.001 0.000 0.000 0.014 ENE 0.000 0.000 0.000 0.000 0.001 0.001 0.000 0.000 0.000 0.002 E 0.000 0.000 0.000 0.000 0.001 0.000 0.000 0.000 0.000 0.001 ESE 0.000 0.000 0.002 0.014 0.009 0.002 0.000 0.000 0.000 0.027 SE 0.000 0.000 0.006 0.017 0.005 0.001 0.000 0.000 0.000 0.029 SSE 0.000 0.000 0.006 0.004 0.000 0.000 0.000 0.000 0.000 0.011 S 0.000 0.000 0.010 0.008 0.004 0.000 0.000 0.000 0.000 0.022 SSW 0.000 0.000 0.008 0.010 0.002 0.000 0.000 0.000 0.000 0.019 SW 0.000 0.000 0.002 0.002 0.001 0.000 0.000 0.000 0.000 0.005 WSW 0.000 0.000 0.000 0.008 0.005 0.003 0.000 0.000 0.000 0.016 W 0.000 0.000 0.000 0.005 0.014 0.012 0.002 0.000 0.000 0.034 WNW 0.000 0.000 0.000 0.000 0.007 0.038 0.022 0.004 0.000 0.072 NW 0.000 0.000 0.000 0.000 0.006 0.037 0.022 0.006 0.000 0.072 NNW 0.000 0.000 0.000 0.000 0.005 0.026 0.010 0.000 0.000 0.042 SUBTOTAL 0.000 0.000 0.036 0.069 0.085 0.180 0.058 0.010 0.000 0.438 TOTAL HOURS OF VALID OBSERVATIONS 85083.000 TOTAL HOURS OF GROUND LEVEL RELEASE 8848.910 TOTAL HOURS OF STABILITY CLASS B 1672.650 TOTAL HOURS OF GROUND LEVEL STABILITY CLASS B 373.010 METEOROLOGICAL FACILITY: BROWNS FERRY NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 10.03 AND 45.30 METERS WIND DIRECTION MEASURED AT 10.50 METER LEVEL WIND SPEED MEASURED AT 10.50 METER LEVEL EFFLUENT VELOCITY = 12.60 M/S DATE PRINTED: 2021/06/29 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS

Browns Ferry Nuclear Plant Units 1, 2 and 3 2024 Annual Radioactive Effluent Release Report Meteorological Data Page 49 of 68 SPLIT JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS C (-1.7< DELTA T<=-1.5 C/100 M)

BROWNS FERRY NUCLEAR PLANT PART 1 OF 2 GROUND LEVEL RELEASE MODE JAN 1, 2009 - DEC 31, 2018 WIND WIND SPEED(MPH)

DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.000 0.000 0.001 0.014 0.020 0.002 0.000 0.000 0.037 NNE 0.000 0.000 0.000 0.001 0.013 0.014 0.000 0.000 0.000 0.028 NE 0.000 0.000 0.000 0.000 0.004 0.010 0.000 0.000 0.000 0.015 ENE 0.000 0.000 0.000 0.000 0.001 0.001 0.000 0.000 0.000 0.002 E 0.000 0.000 0.000 0.001 0.002 0.000 0.000 0.000 0.000 0.004 ESE 0.000 0.000 0.002 0.012 0.011 0.003 0.000 0.000 0.000 0.027 SE 0.000 0.000 0.006 0.019 0.007 0.002 0.000 0.000 0.000 0.034 SSE 0.000 0.000 0.008 0.006 0.001 0.000 0.000 0.000 0.000 0.015 S 0.000 0.000 0.010 0.005 0.002 0.000 0.000 0.000 0.000 0.018 SSW 0.000 0.000 0.007 0.010 0.002 0.000 0.000 0.000 0.000 0.019 SW 0.000 0.000 0.003 0.003 0.001 0.000 0.000 0.000 0.000 0.007 WSW 0.000 0.000 0.001 0.007 0.005 0.005 0.000 0.000 0.000 0.017 W 0.000 0.000 0.000 0.006 0.016 0.015 0.003 0.000 0.000 0.040 WNW 0.000 0.000 0.000 0.000 0.010 0.043 0.022 0.005 0.000 0.081 NW 0.000 0.000 0.000 0.000 0.008 0.039 0.022 0.008 0.000 0.078 NNW 0.000 0.000 0.000 0.000 0.008 0.031 0.007 0.000 0.000 0.047 SUBTOTAL 0.000 0.000 0.039 0.073 0.104 0.183 0.057 0.013 0.000 0.468 TOTAL HOURS OF VALID OBSERVATIONS 85083.000 TOTAL HOURS OF GROUND LEVEL RELEASE 8848.910 TOTAL HOURS OF STABILITY CLASS C 3722.810 TOTAL HOURS OF GROUND LEVEL STABILITY CLASS C 398.330 METEOROLOGICAL FACILITY: BROWNS FERRY NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 10.03 AND 45.30 METERS WIND DIRECTION MEASURED AT 10.50 METER LEVEL WIND SPEED MEASURED AT 10.50 METER LEVEL EFFLUENT VELOCITY = 12.60 M/S DATE PRINTED: 2021/06/29 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS

Browns Ferry Nuclear Plant Units 1, 2 and 3 2024 Annual Radioactive Effluent Release Report Meteorological Data Page 50 of 68 SPLIT JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS D (-1.5< DELTA T<=-0.5 C/100 M)

BROWNS FERRY NUCLEAR PLANT PART 1 OF 2 GROUND LEVEL RELEASE MODE JAN 1, 2009 - DEC 31, 2018 WIND WIND SPEED(MPH)

DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.000 0.001 0.034 0.097 0.118 0.009 0.000 0.000 0.260 NNE 0.000 0.000 0.001 0.030 0.079 0.080 0.003 0.000 0.000 0.193 NE 0.000 0.000 0.000 0.013 0.038 0.045 0.003 0.000 0.000 0.099 ENE 0.000 0.000 0.000 0.012 0.017 0.008 0.000 0.000 0.000 0.037 E 0.000 0.000 0.008 0.041 0.021 0.006 0.000 0.000 0.000 0.076 ESE 0.000 0.000 0.039 0.128 0.089 0.044 0.000 0.000 0.000 0.301 SE 0.000 0.001 0.059 0.071 0.039 0.026 0.000 0.000 0.000 0.196 SSE 0.000 0.000 0.059 0.039 0.004 0.001 0.000 0.000 0.000 0.102 S 0.000 0.000 0.085 0.072 0.042 0.015 0.000 0.000 0.000 0.214 SSW 0.000 0.000 0.080 0.069 0.022 0.013 0.000 0.000 0.000 0.184 SW 0.000 0.000 0.020 0.011 0.007 0.003 0.000 0.000 0.000 0.042 WSW 0.000 0.000 0.010 0.034 0.023 0.017 0.005 0.000 0.000 0.089 W 0.000 0.000 0.004 0.050 0.082 0.086 0.028 0.002 0.000 0.251 WNW 0.000 0.000 0.000 0.008 0.039 0.139 0.131 0.056 0.001 0.374 NW 0.000 0.000 0.000 0.008 0.049 0.219 0.225 0.061 0.001 0.564 NNW 0.000 0.000 0.000 0.017 0.080 0.204 0.083 0.002 0.000 0.385 SUBTOTAL 0.000 0.002 0.367 0.635 0.727 1.025 0.487 0.122 0.002 3.366 TOTAL HOURS OF VALID OBSERVATIONS 85083.000 TOTAL HOURS OF GROUND LEVEL RELEASE 8848.910 TOTAL HOURS OF STABILITY CLASS D 35591.270 TOTAL HOURS OF GROUND LEVEL STABILITY CLASS D 2863.660 METEOROLOGICAL FACILITY: BROWNS FERRY NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 10.03 AND 45.30 METERS WIND DIRECTION MEASURED AT 10.50 METER LEVEL WIND SPEED MEASURED AT 10.50 METER LEVEL EFFLUENT VELOCITY = 12.60 M/S DATE PRINTED: 2021/06/29 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS

Browns Ferry Nuclear Plant Units 1, 2 and 3 2024 Annual Radioactive Effluent Release Report Meteorological Data Page 51 of 68 SPLIT JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS E (-0.5< DELTA T<= 1.5 C/100 M)

BROWNS FERRY NUCLEAR PLANT PART 1 OF 2 GROUND LEVEL RELEASE MODE JAN 1, 2009 - DEC 31, 2018 WIND WIND SPEED(MPH)

DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.000 0.033 0.063 0.037 0.020 0.003 0.000 0.000 0.157 NNE 0.000 0.001 0.017 0.080 0.057 0.024 0.001 0.000 0.000 0.179 NE 0.000 0.001 0.009 0.034 0.037 0.024 0.000 0.000 0.000 0.104 ENE 0.000 0.003 0.023 0.034 0.012 0.003 0.001 0.000 0.000 0.076 E 0.000 0.004 0.085 0.103 0.012 0.003 0.000 0.000 0.000 0.207 ESE 0.000 0.005 0.106 0.178 0.053 0.016 0.003 0.000 0.000 0.360 SE 0.000 0.007 0.092 0.119 0.076 0.027 0.000 0.000 0.000 0.321 SSE 0.000 0.008 0.132 0.094 0.010 0.001 0.000 0.000 0.000 0.244 S 0.000 0.006 0.155 0.174 0.168 0.098 0.000 0.000 0.000 0.601 SSW 0.000 0.004 0.079 0.091 0.042 0.044 0.001 0.000 0.000 0.260 SW 0.000 0.002 0.022 0.011 0.003 0.004 0.000 0.000 0.000 0.043 WSW 0.000 0.000 0.020 0.018 0.009 0.004 0.002 0.000 0.000 0.053 W 0.000 0.000 0.015 0.049 0.023 0.015 0.002 0.000 0.000 0.105 WNW 0.000 0.001 0.003 0.010 0.015 0.019 0.010 0.002 0.000 0.060 NW 0.000 0.001 0.003 0.019 0.032 0.057 0.020 0.003 0.000 0.135 NNW 0.000 0.000 0.019 0.069 0.071 0.058 0.006 0.000 0.000 0.224 SUBTOTAL 0.000 0.042 0.813 1.146 0.656 0.417 0.050 0.006 0.000 3.129 TOTAL HOURS OF VALID OBSERVATIONS 85083.000 TOTAL HOURS OF GROUND LEVEL RELEASE 8848.910 TOTAL HOURS OF STABILITY CLASS E 27241.568 TOTAL HOURS OF GROUND LEVEL STABILITY CLASS E 2662.110 METEOROLOGICAL FACILITY: BROWNS FERRY NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 10.03 AND 45.30 METERS WIND DIRECTION MEASURED AT 10.50 METER LEVEL WIND SPEED MEASURED AT 10.50 METER LEVEL EFFLUENT VELOCITY = 12.60 M/S DATE PRINTED: 2021/06/29 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS

Browns Ferry Nuclear Plant Units 1, 2 and 3 2024 Annual Radioactive Effluent Release Report Meteorological Data Page 52 of 68 SPLIT JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS F ( 1.5< DELTA T<= 4.0 C/100 M)

BROWNS FERRY NUCLEAR PLANT PART 1 OF 2 GROUND LEVEL RELEASE MODE JAN 1, 2009 - DEC 31, 2018 WIND WIND SPEED(MPH)

DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.003 0.100 0.070 0.007 0.000 0.000 0.000 0.000 0.180 NNE 0.000 0.002 0.036 0.075 0.018 0.001 0.000 0.000 0.000 0.133 NE 0.000 0.005 0.015 0.017 0.008 0.002 0.001 0.000 0.000 0.048 ENE 0.000 0.008 0.032 0.021 0.003 0.000 0.000 0.000 0.000 0.064 E 0.000 0.013 0.075 0.042 0.000 0.000 0.000 0.000 0.000 0.130 ESE 0.000 0.009 0.061 0.018 0.000 0.001 0.000 0.000 0.000 0.090 SE 0.000 0.015 0.062 0.029 0.011 0.003 0.000 0.000 0.000 0.120 SSE 0.000 0.019 0.124 0.051 0.010 0.000 0.000 0.000 0.000 0.205 S 0.000 0.010 0.094 0.121 0.105 0.055 0.000 0.000 0.000 0.385 SSW 0.000 0.004 0.026 0.014 0.007 0.005 0.000 0.000 0.000 0.057 SW 0.000 0.001 0.007 0.002 0.000 0.001 0.000 0.000 0.000 0.010 WSW 0.000 0.001 0.004 0.001 0.000 0.000 0.000 0.000 0.000 0.006 W 0.000 0.001 0.002 0.001 0.000 0.000 0.000 0.000 0.000 0.005 WNW 0.000 0.001 0.001 0.001 0.001 0.001 0.001 0.001 0.000 0.006 NW 0.000 0.001 0.004 0.005 0.001 0.001 0.000 0.000 0.000 0.012 NNW 0.000 0.000 0.028 0.039 0.011 0.001 0.000 0.000 0.000 0.080 SUBTOTAL 0.000 0.093 0.672 0.506 0.183 0.071 0.003 0.001 0.000 1.530 TOTAL HOURS OF VALID OBSERVATIONS 85083.000 TOTAL HOURS OF GROUND LEVEL RELEASE 8848.910 TOTAL HOURS OF STABILITY CLASS F 11784.029 TOTAL HOURS OF GROUND LEVEL STABILITY CLASS F 1301.890 METEOROLOGICAL FACILITY: BROWNS FERRY NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 10.03 AND 45.30 METERS WIND DIRECTION MEASURED AT 10.50 METER LEVEL WIND SPEED MEASURED AT 10.50 METER LEVEL EFFLUENT VELOCITY = 12.60 M/S DATE PRINTED: 2021/06/29 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS

Browns Ferry Nuclear Plant Units 1, 2 and 3 2024 Annual Radioactive Effluent Release Report Meteorological Data Page 53 of 68 SPLIT JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS G (DELTA T > 4.0 C/100 M)

BROWNS FERRY NUCLEAR PLANT PART 1 OF 2 GROUND LEVEL RELEASE MODE JAN 1, 2009 - DEC 31, 2018 WIND WIND SPEED(MPH)

DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.004 0.065 0.044 0.000 0.000 0.000 0.000 0.000 0.113 NNE 0.000 0.002 0.022 0.019 0.000 0.002 0.000 0.000 0.000 0.045 NE 0.000 0.005 0.012 0.004 0.001 0.001 0.000 0.000 0.000 0.023 ENE 0.000 0.011 0.021 0.006 0.001 0.000 0.000 0.000 0.000 0.038 E 0.000 0.011 0.017 0.003 0.000 0.000 0.000 0.000 0.000 0.032 ESE 0.000 0.012 0.010 0.001 0.000 0.000 0.000 0.000 0.000 0.023 SE 0.000 0.019 0.021 0.005 0.001 0.000 0.000 0.000 0.000 0.047 SSE 0.000 0.033 0.122 0.033 0.002 0.000 0.000 0.000 0.000 0.191 S 0.000 0.009 0.071 0.044 0.028 0.003 0.000 0.000 0.000 0.155 SSW 0.000 0.002 0.002 0.001 0.000 0.000 0.000 0.000 0.000 0.005 SW 0.000 0.001 0.000 0.000 0.001 0.000 0.000 0.000 0.000 0.002 WSW 0.000 0.001 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.001 W 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.001 WNW 0.000 0.001 0.001 0.000 0.000 0.000 0.000 0.000 0.000 0.001 NW 0.000 0.001 0.001 0.001 0.000 0.000 0.000 0.000 0.000 0.002 NNW 0.000 0.003 0.014 0.005 0.000 0.000 0.000 0.000 0.000 0.022 SUBTOTAL 0.001 0.115 0.378 0.166 0.034 0.006 0.000 0.000 0.000 0.701 TOTAL HOURS OF VALID OBSERVATIONS 85083.000 TOTAL HOURS OF GROUND LEVEL RELEASE 8848.910 TOTAL HOURS OF STABILITY CLASS G 3774.870 TOTAL HOURS OF GROUND LEVEL STABILITY CLASS G 596.160 METEOROLOGICAL FACILITY: BROWNS FERRY NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 10.03 AND 45.30 METERS WIND DIRECTION MEASURED AT 10.50 METER LEVEL WIND SPEED MEASURED AT 10.50 METER LEVEL EFFLUENT VELOCITY = 12.60 M/S DATE PRINTED: 2021/06/29 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS

Browns Ferry Nuclear Plant Units 1, 2 and 3 2024 Annual Radioactive Effluent Release Report Meteorological Data Page 54 of 68 SPLIT JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS A (DELTA T<=-1.9 C/100 M)

BROWNS FERRY NUCLEAR PLANT PART 2 OF 2 ELEVATED RELEASE MODE JAN 1, 2009 - DEC 31, 2018 WIND WIND SPEED(MPH)

DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.000 0.000 0.000 0.000 0.002 0.031 0.002 0.000 0.035 NNE 0.000 0.000 0.001 0.000 0.000 0.002 0.013 0.000 0.000 0.017 NE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 ENE 0.000 0.000 0.001 0.000 0.000 0.000 0.000 0.000 0.000 0.001 E 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 ESE 0.000 0.000 0.000 0.000 0.001 0.007 0.005 0.000 0.000 0.013 SE 0.000 0.000 0.001 0.008 0.031 0.080 0.021 0.004 0.001 0.146 SSE 0.000 0.000 0.000 0.015 0.098 0.089 0.037 0.007 0.000 0.247 S 0.000 0.000 0.000 0.005 0.044 0.062 0.027 0.000 0.000 0.138 SSW 0.000 0.000 0.000 0.001 0.014 0.032 0.006 0.000 0.000 0.052 SW 0.000 0.000 0.000 0.007 0.018 0.021 0.003 0.000 0.000 0.049 WSW 0.000 0.000 0.000 0.002 0.010 0.007 0.000 0.000 0.000 0.020 W 0.000 0.000 0.000 0.002 0.002 0.011 0.005 0.000 0.000 0.021 WNW 0.000 0.000 0.000 0.000 0.000 0.000 0.002 0.003 0.000 0.005 NW 0.000 0.000 0.001 0.000 0.000 0.003 0.004 0.001 0.000 0.009 NNW 0.000 0.000 0.000 0.000 0.000 0.000 0.001 0.002 0.000 0.003 SUBTOTAL 0.000 0.000 0.005 0.041 0.219 0.317 0.154 0.018 0.001 0.755 TOTAL HOURS OF VALID OBSERVATIONS 85083.000 TOTAL HOURS OF ELEVATED RELEASES 76234.094 TOTAL HOURS OF STABILITY CLASS A 1295.800 TOTAL HOURS OF ELEVATED STABILITY CLASS A 642.050 METEOROLOGICAL FACILITY: BROWNS FERRY NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 10.03 AND 89.59 METERS WIND DIRECTION MEASURED AT 45.74 METER LEVEL WIND SPEED MEASURED AT 45.74 METER LEVEL EFFLUENT VELOCITY = 12.60 M/S DATE PRINTED: 2021/06/29 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS

Browns Ferry Nuclear Plant Units 1, 2 and 3 2024 Annual Radioactive Effluent Release Report Meteorological Data Page 55 of 68 SPLIT JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS B (-1.9< DELTA T<=-1.7 C/100 M)

BROWNS FERRY NUCLEAR PLANT PART 2 OF 2 ELEVATED RELEASE MODE JAN 1, 2009 - DEC 31, 2018 WIND WIND SPEED(MPH)

DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.000 0.000 0.000 0.001 0.084 0.073 0.005 0.000 0.163 NNE 0.000 0.000 0.000 0.000 0.003 0.057 0.026 0.000 0.000 0.087 NE 0.000 0.000 0.000 0.001 0.001 0.008 0.003 0.000 0.000 0.013 ENE 0.000 0.000 0.000 0.001 0.000 0.001 0.000 0.000 0.000 0.002 E 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 ESE 0.000 0.000 0.000 0.001 0.008 0.023 0.010 0.000 0.000 0.042 SE 0.000 0.000 0.004 0.043 0.093 0.116 0.047 0.003 0.000 0.307 SSE 0.000 0.000 0.004 0.051 0.077 0.050 0.019 0.003 0.000 0.204 S 0.000 0.000 0.000 0.034 0.057 0.084 0.036 0.001 0.000 0.212 SSW 0.000 0.000 0.000 0.032 0.030 0.049 0.015 0.000 0.000 0.126 SW 0.000 0.000 0.000 0.027 0.028 0.046 0.005 0.000 0.000 0.106 WSW 0.000 0.000 0.000 0.012 0.019 0.024 0.005 0.000 0.000 0.060 W 0.000 0.000 0.000 0.008 0.015 0.047 0.016 0.000 0.000 0.087 WNW 0.000 0.000 0.000 0.000 0.002 0.012 0.025 0.002 0.000 0.042 NW 0.000 0.000 0.000 0.001 0.000 0.008 0.016 0.002 0.000 0.028 NNW 0.000 0.000 0.000 0.000 0.000 0.013 0.030 0.007 0.000 0.051 SUBTOTAL 0.000 0.000 0.007 0.212 0.335 0.624 0.326 0.024 0.001 1.527 TOTAL HOURS OF VALID OBSERVATIONS 85083.000 TOTAL HOURS OF ELEVATED RELEASES 76234.094 TOTAL HOURS OF STABILITY CLASS B 1672.650 TOTAL HOURS OF ELEVATED STABILITY CLASS B 1299.640 METEOROLOGICAL FACILITY: BROWNS FERRY NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 10.03 AND 89.59 METERS WIND DIRECTION MEASURED AT 45.74 METER LEVEL WIND SPEED MEASURED AT 45.74 METER LEVEL EFFLUENT VELOCITY = 12.60 M/S DATE PRINTED: 2021/06/29 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS

Browns Ferry Nuclear Plant Units 1, 2 and 3 2024 Annual Radioactive Effluent Release Report Meteorological Data Page 56 of 68 SPLIT JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS C (-1.7< DELTA T<=-1.5 C/100 M)

BROWNS FERRY NUCLEAR PLANT PART 2 OF 2 ELEVATED RELEASE MODE JAN 1, 2009 - DEC 31, 2018 WIND WIND SPEED(MPH)

DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.000 0.001 0.009 0.024 0.244 0.083 0.005 0.000 0.366 NNE 0.000 0.000 0.000 0.006 0.020 0.208 0.062 0.001 0.000 0.297 NE 0.000 0.000 0.000 0.001 0.008 0.038 0.011 0.000 0.000 0.058 ENE 0.000 0.000 0.002 0.000 0.001 0.002 0.001 0.000 0.000 0.007 E 0.000 0.000 0.000 0.001 0.003 0.002 0.000 0.000 0.000 0.007 ESE 0.000 0.000 0.000 0.002 0.034 0.061 0.023 0.000 0.000 0.120 SE 0.000 0.000 0.007 0.205 0.185 0.187 0.058 0.004 0.000 0.646 SSE 0.000 0.000 0.021 0.128 0.088 0.050 0.030 0.007 0.000 0.324 S 0.000 0.000 0.012 0.105 0.047 0.112 0.041 0.004 0.000 0.321 SSW 0.000 0.000 0.007 0.098 0.057 0.088 0.027 0.002 0.000 0.279 SW 0.000 0.000 0.006 0.079 0.062 0.056 0.012 0.000 0.000 0.215 WSW 0.000 0.000 0.005 0.076 0.079 0.077 0.019 0.002 0.000 0.257 W 0.000 0.000 0.002 0.041 0.097 0.148 0.031 0.003 0.000 0.322 WNW 0.000 0.000 0.000 0.007 0.020 0.109 0.129 0.024 0.000 0.290 NW 0.000 0.000 0.000 0.000 0.007 0.085 0.102 0.015 0.001 0.209 NNW 0.000 0.000 0.000 0.002 0.005 0.073 0.098 0.013 0.000 0.191 SUBTOTAL 0.000 0.000 0.063 0.760 0.737 1.539 0.727 0.079 0.002 3.907 TOTAL HOURS OF VALID OBSERVATIONS 85083.000 TOTAL HOURS OF ELEVATED RELEASES 76234.094 TOTAL HOURS OF STABILITY CLASS C 3722.810 TOTAL HOURS OF ELEVATED STABILITY CLASS C 3324.480 METEOROLOGICAL FACILITY: BROWNS FERRY NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 10.03 AND 89.59 METERS WIND DIRECTION MEASURED AT 45.74 METER LEVEL WIND SPEED MEASURED AT 45.74 METER LEVEL EFFLUENT VELOCITY = 12.60 M/S DATE PRINTED: 2021/06/29 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS

Browns Ferry Nuclear Plant Units 1, 2 and 3 2024 Annual Radioactive Effluent Release Report Meteorological Data Page 57 of 68 SPLIT JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS D (-1.5< DELTA T<=-0.5 C/100 M)

BROWNS FERRY NUCLEAR PLANT PART 2 OF 2 ELEVATED RELEASE MODE JAN 1, 2009 - DEC 31, 2018 WIND WIND SPEED(MPH)

DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.005 0.101 0.273 0.483 1.333 0.725 0.065 0.000 2.985 NNE 0.000 0.002 0.122 0.354 0.536 1.185 0.333 0.016 0.000 2.548 NE 0.000 0.004 0.095 0.254 0.366 0.546 0.067 0.004 0.000 1.335 ENE 0.000 0.000 0.102 0.196 0.218 0.163 0.013 0.000 0.000 0.693 E 0.000 0.009 0.079 0.232 0.224 0.184 0.032 0.002 0.000 0.761 ESE 0.000 0.009 0.112 0.317 0.356 0.634 0.151 0.009 0.000 1.589 SE 0.000 0.008 0.361 0.847 0.553 0.808 0.629 0.188 0.008 3.403 SSE 0.000 0.013 0.556 0.608 0.382 0.730 0.509 0.098 0.004 2.900 S 0.000 0.014 0.435 0.633 0.499 0.915 0.483 0.110 0.005 3.094 SSW 0.000 0.008 0.456 0.682 0.414 0.713 0.350 0.044 0.002 2.670 SW 0.000 0.012 0.454 0.697 0.438 0.375 0.095 0.005 0.000 2.076 WSW 0.000 0.006 0.277 0.739 0.453 0.567 0.146 0.015 0.001 2.204 W 0.000 0.009 0.173 0.671 0.778 1.085 0.318 0.044 0.001 3.080 WNW 0.000 0.007 0.098 0.384 0.495 1.280 0.631 0.186 0.005 3.086 NW 0.000 0.001 0.085 0.294 0.438 1.251 1.045 0.229 0.008 3.351 NNW 0.000 0.005 0.095 0.243 0.379 1.125 0.723 0.121 0.001 2.693 SUBTOTAL 0.001 0.113 3.600 7.425 7.013 12.893 6.249 1.136 0.035 38.465 TOTAL HOURS OF VALID OBSERVATIONS 85083.000 TOTAL HOURS OF ELEVATED RELEASES 76234.094 TOTAL HOURS OF STABILITY CLASS D 35591.270 TOTAL HOURS OF ELEVATED STABILITY CLASS D 32727.609 METEOROLOGICAL FACILITY: BROWNS FERRY NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 10.03 AND 89.59 METERS WIND DIRECTION MEASURED AT 45.74 METER LEVEL WIND SPEED MEASURED AT 45.74 METER LEVEL EFFLUENT VELOCITY = 12.60 M/S DATE PRINTED: 2021/06/29 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS

Browns Ferry Nuclear Plant Units 1, 2 and 3 2024 Annual Radioactive Effluent Release Report Meteorological Data Page 58 of 68 SPLIT JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS E (-0.5< DELTA T<= 1.5 C/100 M)

BROWNS FERRY NUCLEAR PLANT PART 2 OF 2 ELEVATED RELEASE MODE JAN 1, 2009 - DEC 31, 2018 WIND WIND SPEED(MPH)

DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.008 0.099 0.242 0.381 0.874 0.195 0.006 0.000 1.805 NNE 0.000 0.004 0.115 0.227 0.379 0.958 0.192 0.004 0.000 1.879 NE 0.000 0.006 0.121 0.234 0.316 0.574 0.075 0.000 0.000 1.326 ENE 0.000 0.004 0.114 0.235 0.246 0.270 0.013 0.002 0.000 0.882 E 0.000 0.009 0.114 0.236 0.380 0.437 0.013 0.000 0.000 1.189 ESE 0.000 0.011 0.126 0.290 0.516 1.199 0.141 0.008 0.000 2.291 SE 0.000 0.006 0.166 0.389 0.480 1.210 0.666 0.140 0.008 3.066 SSE 0.000 0.014 0.195 0.491 0.532 0.994 0.700 0.212 0.013 3.152 S 0.000 0.016 0.207 0.470 0.504 1.039 0.820 0.321 0.018 3.396 SSW 0.000 0.008 0.212 0.462 0.407 0.665 0.461 0.135 0.005 2.355 SW 0.000 0.005 0.280 0.543 0.327 0.313 0.104 0.011 0.000 1.583 WSW 0.000 0.005 0.173 0.376 0.274 0.200 0.044 0.005 0.000 1.076 W 0.000 0.002 0.140 0.323 0.478 0.399 0.042 0.004 0.000 1.388 WNW 0.000 0.005 0.071 0.195 0.201 0.268 0.056 0.006 0.000 0.801 NW 0.000 0.011 0.080 0.136 0.160 0.450 0.203 0.005 0.000 1.045 NNW 0.000 0.004 0.089 0.197 0.268 0.877 0.216 0.003 0.000 1.654 SUBTOTAL 0.000 0.116 2.300 5.048 5.849 10.728 3.941 0.862 0.044 28.889 TOTAL HOURS OF VALID OBSERVATIONS 85083.000 TOTAL HOURS OF ELEVATED RELEASES 76234.094 TOTAL HOURS OF STABILITY CLASS E 27241.568 TOTAL HOURS OF ELEVATED STABILITY CLASS E 24579.459 METEOROLOGICAL FACILITY: BROWNS FERRY NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 10.03 AND 89.59 METERS WIND DIRECTION MEASURED AT 45.74 METER LEVEL WIND SPEED MEASURED AT 45.74 METER LEVEL EFFLUENT VELOCITY = 12.60 M/S DATE PRINTED: 2021/06/29 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS

Browns Ferry Nuclear Plant Units 1, 2 and 3 2024 Annual Radioactive Effluent Release Report Meteorological Data Page 59 of 68 SPLIT JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS F ( 1.5< DELTA T<= 4.0 C/100 M)

BROWNS FERRY NUCLEAR PLANT PART 2 OF 2 ELEVATED RELEASE MODE JAN 1, 2009 - DEC 31, 2018 WIND WIND SPEED(MPH)

DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.002 0.047 0.083 0.146 0.634 0.057 0.000 0.000 0.971 NNE 0.000 0.004 0.053 0.100 0.193 0.689 0.101 0.001 0.000 1.140 NE 0.000 0.006 0.072 0.165 0.230 0.393 0.030 0.000 0.000 0.896 ENE 0.000 0.001 0.072 0.139 0.195 0.238 0.013 0.000 0.000 0.657 E 0.000 0.008 0.073 0.122 0.208 0.300 0.001 0.000 0.000 0.712 ESE 0.000 0.008 0.103 0.196 0.292 0.463 0.004 0.000 0.000 1.068 SE 0.000 0.015 0.142 0.234 0.353 0.561 0.099 0.026 0.001 1.431 SSE 0.000 0.008 0.127 0.179 0.217 0.354 0.340 0.076 0.004 1.305 S 0.000 0.013 0.134 0.160 0.202 0.552 0.360 0.054 0.003 1.478 SSW 0.000 0.008 0.125 0.125 0.155 0.198 0.037 0.002 0.000 0.649 SW 0.000 0.009 0.122 0.133 0.074 0.056 0.002 0.000 0.000 0.396 WSW 0.000 0.016 0.106 0.096 0.033 0.004 0.000 0.000 0.000 0.256 W 0.000 0.007 0.087 0.122 0.056 0.014 0.001 0.000 0.000 0.287 WNW 0.000 0.006 0.055 0.092 0.065 0.013 0.001 0.000 0.000 0.231 NW 0.000 0.004 0.066 0.101 0.098 0.072 0.000 0.000 0.000 0.340 NNW 0.000 0.006 0.045 0.098 0.098 0.235 0.021 0.000 0.000 0.503 SUBTOTAL 0.001 0.122 1.428 2.144 2.616 4.775 1.067 0.159 0.007 12.320 TOTAL HOURS OF VALID OBSERVATIONS 85083.000 TOTAL HOURS OF ELEVATED RELEASES 76234.094 TOTAL HOURS OF STABILITY CLASS F 11784.029 TOTAL HOURS OF ELEVATED STABILITY CLASS F 10482.140 METEOROLOGICAL FACILITY: BROWNS FERRY NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 10.03 AND 89.59 METERS WIND DIRECTION MEASURED AT 45.74 METER LEVEL WIND SPEED MEASURED AT 45.74 METER LEVEL EFFLUENT VELOCITY = 12.60 M/S DATE PRINTED: 2021/06/29 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS

Browns Ferry Nuclear Plant Units 1, 2 and 3 2024 Annual Radioactive Effluent Release Report Meteorological Data Page 60 of 68 SPLIT JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS G (DELTA T > 4.0 C/100 M)

BROWNS FERRY NUCLEAR PLANT PART 2 OF 2 ELEVATED RELEASE MODE JAN 1, 2009 - DEC 31, 2018 WIND WIND SPEED(MPH)

DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.001 0.024 0.027 0.026 0.136 0.014 0.000 0.000 0.227 NNE 0.000 0.006 0.026 0.038 0.057 0.169 0.035 0.000 0.000 0.330 NE 0.000 0.004 0.051 0.083 0.095 0.135 0.004 0.000 0.000 0.372 ENE 0.000 0.006 0.033 0.067 0.082 0.082 0.002 0.000 0.000 0.271 E 0.000 0.006 0.068 0.073 0.050 0.044 0.002 0.000 0.000 0.243 ESE 0.000 0.009 0.067 0.105 0.098 0.056 0.000 0.000 0.000 0.335 SE 0.000 0.013 0.118 0.197 0.195 0.086 0.001 0.002 0.000 0.611 SSE 0.000 0.020 0.118 0.082 0.037 0.028 0.050 0.014 0.000 0.348 S 0.000 0.011 0.067 0.048 0.024 0.055 0.036 0.001 0.000 0.241 SSW 0.000 0.014 0.071 0.039 0.018 0.021 0.000 0.000 0.000 0.162 SW 0.000 0.012 0.052 0.029 0.008 0.001 0.000 0.000 0.000 0.102 WSW 0.000 0.008 0.051 0.012 0.001 0.000 0.000 0.000 0.000 0.072 W 0.000 0.009 0.062 0.028 0.009 0.000 0.000 0.000 0.000 0.109 WNW 0.000 0.007 0.033 0.034 0.011 0.001 0.000 0.000 0.000 0.087 NW 0.000 0.008 0.036 0.031 0.024 0.013 0.000 0.000 0.000 0.112 NNW 0.000 0.008 0.034 0.034 0.023 0.012 0.002 0.000 0.000 0.113 SUBTOTAL 0.002 0.142 0.909 0.927 0.757 0.838 0.144 0.016 0.000 3.736 TOTAL HOURS OF VALID OBSERVATIONS 85083.000 TOTAL HOURS OF ELEVATED RELEASES 76234.094 TOTAL HOURS OF STABILITY CLASS G 3774.870 TOTAL HOURS OF ELEVATED STABILITY CLASS G 3178.710 METEOROLOGICAL FACILITY: BROWNS FERRY NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 10.03 AND 89.59 METERS WIND DIRECTION MEASURED AT 45.74 METER LEVEL WIND SPEED MEASURED AT 45.74 METER LEVEL EFFLUENT VELOCITY = 12.60 M/S DATE PRINTED: 2021/06/29 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS

Browns Ferry Nuclear Plant Units 1, 2 and 3 2024 Annual Radioactive Effluent Release Report Meteorological Data Page 61 of 68 Table 8 - Elevated Releases 2009 - 2018 Joint Frequency Distribution In Percent

Browns Ferry Nuclear Plant Units 1, 2 and 3 2024 Annual Radioactive Effluent Release Report Meteorological Data Page 62 of 68 JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS A (DELTA T<=-1.9 C/100 M)

BROWNS FERRY NUCLEAR PLANT JAN 1, 2009 - DEC 31, 2018 WIND WIND SPEED(MPH)

DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.000 0.000 0.000 0.000 0.000 0.033 0.008 0.002 0.044 NNE 0.000 0.000 0.002 0.000 0.000 0.000 0.014 0.004 0.000 0.020 NE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 ENE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 E 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 ESE 0.000 0.000 0.000 0.000 0.000 0.029 0.026 0.004 0.000 0.059 SE 0.000 0.000 0.000 0.009 0.029 0.093 0.029 0.008 0.007 0.177 SSE 0.000 0.000 0.000 0.016 0.074 0.094 0.044 0.021 0.004 0.253 S 0.000 0.000 0.000 0.002 0.020 0.058 0.044 0.002 0.000 0.126 SSW 0.000 0.000 0.000 0.001 0.004 0.033 0.021 0.002 0.000 0.061 SW 0.000 0.000 0.000 0.002 0.002 0.028 0.008 0.006 0.000 0.047 WSW 0.000 0.000 0.000 0.005 0.005 0.012 0.007 0.000 0.000 0.028 W 0.000 0.000 0.000 0.001 0.000 0.008 0.009 0.002 0.000 0.021 WNW 0.000 0.000 0.000 0.000 0.000 0.000 0.001 0.005 0.000 0.006 NW 0.000 0.000 0.001 0.000 0.000 0.002 0.004 0.001 0.000 0.008 NNW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.002 0.002 0.005 SUBTOTAL 0.000 0.000 0.004 0.038 0.134 0.358 0.240 0.066 0.015 0.855 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 85621 TOTAL HOURS OF STABILITY CLASS A 730 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS A 726 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 84888 TOTAL HOURS CALM 0 METEOROLOGICAL FACILITY: BROWNS FERRY NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 10.03 AND 89.59 METERS WIND SPEED AND DIRECTION MEASURED AT 90.29 METER LEVEL DATE PRINTED: 2021/06/29 MEAN WIND SPEED = 11.70 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS

Browns Ferry Nuclear Plant Units 1, 2 and 3 2024 Annual Radioactive Effluent Release Report Meteorological Data Page 63 of 68 JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS B (-1.9< DELTA T<=-1.7 C/100 M)

BROWNS FERRY NUCLEAR PLANT JAN 1, 2009 - DEC 31, 2018 WIND WIND SPEED(MPH)

DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.000 0.000 0.000 0.001 0.051 0.132 0.020 0.001 0.205 NNE 0.000 0.000 0.000 0.000 0.001 0.037 0.049 0.001 0.000 0.088 NE 0.000 0.000 0.000 0.001 0.000 0.006 0.004 0.002 0.000 0.013 ENE 0.000 0.000 0.000 0.000 0.001 0.000 0.001 0.000 0.000 0.002 E 0.000 0.000 0.000 0.000 0.000 0.002 0.000 0.000 0.000 0.002 ESE 0.000 0.000 0.000 0.007 0.019 0.064 0.038 0.006 0.000 0.133 SE 0.000 0.000 0.002 0.040 0.090 0.112 0.049 0.012 0.008 0.313 SSE 0.000 0.000 0.001 0.046 0.059 0.042 0.031 0.012 0.002 0.193 S 0.000 0.000 0.000 0.016 0.026 0.082 0.055 0.009 0.000 0.190 SSW 0.000 0.000 0.000 0.024 0.021 0.045 0.033 0.007 0.000 0.130 SW 0.000 0.000 0.000 0.021 0.014 0.040 0.041 0.004 0.001 0.121 WSW 0.000 0.000 0.000 0.011 0.019 0.034 0.021 0.001 0.000 0.086 W 0.000 0.000 0.000 0.004 0.006 0.038 0.046 0.005 0.002 0.100 WNW 0.000 0.000 0.000 0.000 0.002 0.013 0.015 0.015 0.000 0.046 NW 0.000 0.000 0.000 0.001 0.000 0.008 0.015 0.004 0.004 0.032 NNW 0.000 0.000 0.000 0.000 0.000 0.009 0.035 0.018 0.001 0.064 SUBTOTAL 0.000 0.000 0.004 0.171 0.259 0.583 0.567 0.115 0.020 1.719 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 85621 TOTAL HOURS OF STABILITY CLASS B 1478 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS B 1459 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 84888 TOTAL HOURS CALM 0 METEOROLOGICAL FACILITY: BROWNS FERRY NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 10.03 AND 89.59 METERS WIND SPEED AND DIRECTION MEASURED AT 90.29 METER LEVEL DATE PRINTED: 2021/06/29 MEAN WIND SPEED = 11.50 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS

Browns Ferry Nuclear Plant Units 1, 2 and 3 2024 Annual Radioactive Effluent Release Report Meteorological Data Page 64 of 68 JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS C (-1.7< DELTA T<=-1.5 C/100 M)

BROWNS FERRY NUCLEAR PLANT JAN 1, 2009 - DEC 31, 2018 WIND WIND SPEED(MPH)

DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.000 0.001 0.004 0.011 0.206 0.217 0.015 0.001 0.455 NNE 0.000 0.000 0.000 0.004 0.020 0.190 0.099 0.013 0.000 0.325 NE 0.000 0.000 0.000 0.000 0.001 0.025 0.013 0.002 0.000 0.041 ENE 0.000 0.000 0.000 0.000 0.002 0.004 0.002 0.000 0.000 0.008 E 0.000 0.000 0.002 0.001 0.001 0.006 0.000 0.000 0.000 0.011 ESE 0.000 0.000 0.000 0.034 0.097 0.152 0.080 0.015 0.001 0.379 SE 0.000 0.000 0.015 0.137 0.152 0.141 0.064 0.020 0.008 0.537 SSE 0.000 0.000 0.019 0.084 0.053 0.054 0.033 0.022 0.000 0.265 S 0.000 0.000 0.011 0.075 0.040 0.101 0.072 0.014 0.004 0.317 SSW 0.000 0.000 0.006 0.060 0.033 0.091 0.060 0.018 0.000 0.267 SW 0.000 0.000 0.012 0.072 0.031 0.093 0.053 0.011 0.004 0.274 WSW 0.000 0.000 0.006 0.052 0.074 0.118 0.052 0.015 0.002 0.319 W 0.000 0.000 0.002 0.022 0.060 0.163 0.095 0.028 0.004 0.375 WNW 0.000 0.000 0.001 0.001 0.018 0.107 0.143 0.077 0.012 0.358 NW 0.000 0.000 0.000 0.000 0.005 0.065 0.111 0.033 0.009 0.223 NNW 0.000 0.000 0.000 0.001 0.004 0.073 0.124 0.027 0.007 0.236 SUBTOTAL 0.000 0.000 0.075 0.547 0.601 1.588 1.217 0.311 0.052 4.390 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 85621 TOTAL HOURS OF STABILITY CLASS C 3752 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS C 3727 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 84888 TOTAL HOURS CALM 0 METEOROLOGICAL FACILITY: BROWNS FERRY NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 10.03 AND 89.59 METERS WIND SPEED AND DIRECTION MEASURED AT 90.29 METER LEVEL DATE PRINTED: 2021/06/29 MEAN WIND SPEED = 11.06 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS

Browns Ferry Nuclear Plant Units 1, 2 and 3 2024 Annual Radioactive Effluent Release Report Meteorological Data Page 65 of 68 JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS D (-1.5< DELTA T<=-0.5 C/100 M)

BROWNS FERRY NUCLEAR PLANT JAN 1, 2009 - DEC 31, 2018 WIND WIND SPEED(MPH)

DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.004 0.077 0.192 0.386 1.303 1.258 0.298 0.021 3.539 NNE 0.000 0.006 0.086 0.206 0.398 1.224 0.651 0.088 0.005 2.665 NE 0.000 0.007 0.075 0.190 0.229 0.633 0.224 0.024 0.001 1.382 ENE 0.000 0.005 0.075 0.141 0.179 0.290 0.071 0.008 0.001 0.770 E 0.000 0.009 0.092 0.127 0.179 0.293 0.139 0.037 0.002 0.879 ESE 0.000 0.006 0.155 0.377 0.377 0.760 0.543 0.172 0.032 2.422 SE 0.000 0.011 0.279 0.530 0.353 0.623 0.795 0.516 0.223 3.330 SSE 0.000 0.011 0.336 0.392 0.355 0.748 0.660 0.316 0.099 2.916 S 0.000 0.013 0.333 0.365 0.363 0.955 0.776 0.264 0.101 3.171 SSW 0.000 0.016 0.342 0.377 0.331 0.757 0.660 0.193 0.051 2.727 SW 0.000 0.006 0.370 0.395 0.379 0.755 0.373 0.068 0.008 2.355 WSW 0.000 0.009 0.273 0.569 0.419 0.816 0.450 0.115 0.032 2.685 W 0.000 0.007 0.174 0.468 0.607 1.271 0.789 0.279 0.110 3.705 WNW 0.000 0.006 0.105 0.316 0.494 1.421 0.907 0.498 0.191 3.937 NW 0.000 0.005 0.075 0.227 0.333 0.953 1.230 0.620 0.141 3.585 NNW 0.000 0.001 0.079 0.153 0.253 1.088 1.011 0.345 0.058 2.989 SUBTOTAL 0.000 0.121 2.927 5.025 5.636 13.891 10.537 3.842 1.076 43.056 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 85621 TOTAL HOURS OF STABILITY CLASS D 36907 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS D 36549 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 84888 TOTAL HOURS CALM 0 METEOROLOGICAL FACILITY: BROWNS FERRY NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 10.03 AND 89.59 METERS WIND SPEED AND DIRECTION MEASURED AT 90.29 METER LEVEL DATE PRINTED: 2021/06/29 MEAN WIND SPEED = 10.97 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS

Browns Ferry Nuclear Plant Units 1, 2 and 3 2024 Annual Radioactive Effluent Release Report Meteorological Data Page 66 of 68 JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS E (-0.5< DELTA T<= 1.5 C/100 M)

BROWNS FERRY NUCLEAR PLANT JAN 1, 2009 - DEC 31, 2018 WIND WIND SPEED(MPH)

DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.004 0.037 0.088 0.135 0.740 0.838 0.082 0.007 1.931 NNE 0.000 0.005 0.037 0.073 0.150 0.748 0.856 0.137 0.001 2.006 NE 0.000 0.009 0.041 0.110 0.154 0.584 0.507 0.100 0.000 1.506 ENE 0.000 0.004 0.064 0.093 0.152 0.349 0.217 0.020 0.001 0.899 E 0.000 0.007 0.074 0.097 0.118 0.385 0.267 0.020 0.000 0.968 ESE 0.000 0.013 0.066 0.141 0.179 0.787 0.789 0.146 0.037 2.158 SE 0.000 0.004 0.101 0.186 0.311 1.052 1.230 0.502 0.224 3.610 SSE 0.000 0.009 0.101 0.188 0.410 1.222 1.096 0.613 0.273 3.912 S 0.000 0.012 0.105 0.214 0.368 1.134 1.264 0.747 0.370 4.214 SSW 0.000 0.012 0.106 0.153 0.270 0.846 0.896 0.436 0.111 2.830 SW 0.000 0.011 0.097 0.213 0.282 0.790 0.376 0.081 0.015 1.865 WSW 0.000 0.009 0.072 0.188 0.240 0.555 0.203 0.028 0.009 1.305 W 0.000 0.008 0.098 0.205 0.251 0.646 0.290 0.041 0.008 1.547 WNW 0.000 0.009 0.054 0.143 0.192 0.487 0.170 0.033 0.009 1.097 NW 0.000 0.007 0.048 0.105 0.123 0.333 0.416 0.101 0.001 1.134 NNW 0.000 0.004 0.070 0.075 0.111 0.466 0.769 0.090 0.002 1.587 SUBTOTAL 0.001 0.126 1.170 2.274 3.445 11.124 10.183 3.177 1.070 32.569 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 85621 TOTAL HOURS OF STABILITY CLASS E 27887 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS E 27647 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 84888 TOTAL HOURS CALM 1 METEOROLOGICAL FACILITY: BROWNS FERRY NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 10.03 AND 89.59 METERS WIND SPEED AND DIRECTION MEASURED AT 90.29 METER LEVEL DATE PRINTED: 2021/06/29 MEAN WIND SPEED = 12.20 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS

Browns Ferry Nuclear Plant Units 1, 2 and 3 2024 Annual Radioactive Effluent Release Report Meteorological Data Page 67 of 68 JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS F ( 1.5< DELTA T<= 4.0 C/100 M)

BROWNS FERRY NUCLEAR PLANT JAN 1, 2009 - DEC 31, 2018 WIND WIND SPEED(MPH)

DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.007 0.033 0.038 0.052 0.201 0.491 0.086 0.000 0.908 NNE 0.000 0.004 0.029 0.041 0.074 0.265 0.617 0.161 0.002 1.195 NE 0.000 0.005 0.037 0.040 0.072 0.291 0.406 0.098 0.000 0.948 ENE 0.000 0.002 0.035 0.064 0.084 0.278 0.240 0.027 0.000 0.730 E 0.000 0.007 0.044 0.072 0.084 0.251 0.119 0.008 0.000 0.584 ESE 0.000 0.011 0.053 0.105 0.111 0.386 0.240 0.009 0.000 0.915 SE 0.000 0.007 0.106 0.160 0.141 0.543 0.310 0.074 0.020 1.362 SSE 0.000 0.009 0.093 0.135 0.193 0.564 0.603 0.280 0.081 1.960 S 0.000 0.006 0.082 0.067 0.101 0.413 0.798 0.217 0.046 1.731 SSW 0.000 0.004 0.060 0.077 0.091 0.249 0.365 0.037 0.000 0.881 SW 0.000 0.011 0.046 0.073 0.067 0.186 0.097 0.002 0.000 0.482 WSW 0.000 0.005 0.064 0.055 0.053 0.126 0.033 0.000 0.000 0.336 W 0.000 0.006 0.047 0.074 0.059 0.074 0.026 0.000 0.000 0.286 WNW 0.000 0.005 0.048 0.075 0.097 0.104 0.008 0.000 0.000 0.337 NW 0.000 0.005 0.048 0.061 0.079 0.131 0.031 0.000 0.000 0.355 NNW 0.000 0.005 0.038 0.042 0.054 0.125 0.180 0.025 0.000 0.469 SUBTOTAL 0.001 0.097 0.863 1.180 1.411 4.188 4.565 1.025 0.150 13.480 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 85621 TOTAL HOURS OF STABILITY CLASS F 11524 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS F 11443 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 84888 TOTAL HOURS CALM 1 METEOROLOGICAL FACILITY: BROWNS FERRY NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 10.03 AND 89.59 METERS WIND SPEED AND DIRECTION MEASURED AT 90.29 METER LEVEL DATE PRINTED: 2021/06/29 MEAN WIND SPEED = 11.35 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS

Browns Ferry Nuclear Plant Units 1, 2 and 3 2024 Annual Radioactive Effluent Release Report Meteorological Data Page 68 of 68 JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS G (DELTA T > 4.0 C/100 M)

BROWNS FERRY NUCLEAR PLANT JAN 1, 2009 - DEC 31, 2018 WIND WIND SPEED(MPH)

DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.006 0.021 0.019 0.013 0.035 0.080 0.018 0.000 0.192 NNE 0.000 0.005 0.021 0.024 0.013 0.061 0.115 0.059 0.000 0.298 NE 0.000 0.006 0.031 0.029 0.021 0.115 0.117 0.026 0.000 0.345 ENE 0.000 0.011 0.034 0.035 0.035 0.126 0.079 0.005 0.000 0.325 E 0.000 0.006 0.041 0.051 0.048 0.097 0.026 0.001 0.000 0.270 ESE 0.000 0.011 0.054 0.094 0.097 0.066 0.016 0.000 0.000 0.338 SE 0.000 0.005 0.070 0.090 0.078 0.098 0.037 0.004 0.000 0.380 SSE 0.000 0.006 0.053 0.075 0.080 0.167 0.072 0.040 0.002 0.496 S 0.000 0.006 0.041 0.060 0.062 0.098 0.085 0.024 0.000 0.376 SSW 0.000 0.009 0.035 0.062 0.032 0.038 0.035 0.008 0.000 0.220 SW 0.000 0.008 0.032 0.048 0.027 0.027 0.005 0.000 0.000 0.147 WSW 0.000 0.006 0.034 0.037 0.019 0.024 0.005 0.000 0.000 0.124 W 0.000 0.004 0.026 0.031 0.024 0.018 0.000 0.000 0.000 0.101 WNW 0.000 0.006 0.022 0.020 0.007 0.021 0.004 0.000 0.000 0.080 NW 0.000 0.004 0.028 0.016 0.025 0.027 0.005 0.000 0.000 0.105 NNW 0.000 0.005 0.026 0.022 0.031 0.028 0.016 0.004 0.000 0.132 SUBTOTAL 0.002 0.101 0.570 0.714 0.611 1.046 0.696 0.187 0.002 3.931 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 85621 TOTAL HOURS OF STABILITY CLASS G 3343 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS G 3337 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 84888 TOTAL HOURS CALM 2 METEOROLOGICAL FACILITY: BROWNS FERRY NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 10.03 AND 89.59 METERS WIND SPEED AND DIRECTION MEASURED AT 90.29 METER LEVEL DATE PRINTED: 2021/06/29 MEAN WIND SPEED = 8.48 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS

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