Text

Annual Radioactive Effluent Release Report
	ML22119A005
Person / Time
Site:	Watts Bar
Issue date:	04/29/2022
From:	Anthony Williams; Tennessee Valley Authority
To:	; Document Control Desk, Office of Nuclear Material Safety and Safeguards, Office of Nuclear Reactor Regulation
References
	WBL-22-019
	Download: ML22119A005 (79)
	v • d • e

Post Office Box 2000, Spring City, Tennessee 37381 WBL-22-019 April 29, 2022 10 CFR 50.36a(a)(2) 10 CFR 72.104(a)

ATTN: Document Control Desk U.S. Nuclear Regulatory Commission Washington, D.C. 20555-0001 Watts Bar Nuclear Plant, Unit 1 and Unit 2 Facility Operating License Nos. NPF-90 and NPF-96 NRC Docket Nos. 50-390, 50-391, and 72-1048

Subject:

Watts Bar Nuclear Plant 2021 Annual Radioactive Effluent Release Report The purpose of this letter is to provide the Tennessee Valley Authority (TVA) Watts Bar Nuclear Plant (WBN) Annual Radioactive Effluent Release Report (ARERR) for the period of January 1, 2021 to December 31, 2021. The enclosed annual report is being submitted to the Nuclear Regulatory Commission (NRC) in accordance with Title 10 of the Code of Federal Regulations (10 CFR) 50.36a and the WBN, Unit 1 and Unit 2, Technical Specification (TS) 5.9.3, that requires the ARERR be submitted prior to May 1st of each year.

The enclosure provides the required effluent release data. The enclosure includes information related to the Independent Spent Fuel Storage Installation (ISFSI), documents any deviations which have occurred from Offsite Dose Calculation Manual (ODCM) requirements, addresses any radioactive effluent monitoring instrumentation which was inoperable for greater than 30 days, and provides corrections to previous annual reports. Revision 6 of the Two-Unit ODCM, dated November 16, 2020, remains in the current revision.

Enclosure TENNESSEE VALLEY AUTHORITY WATTS BAR NUCLEAR PLANT 2021 Annual Radioactive Effluent Release Report WBL-22-019 E1 of 77

Watts Bar Nuclear Power Plant Tennessee Valley Authority Annual Radioactive Effluent Release Report 2021 WBL-22-019 E2 of 77

Watts Bar Nuclear Power Plant Units 1 and 2 2021 Annual Radioactive Effluent Release Report I. Introduction .......................................................................................................................................... 5 II. Supplemental Information .................................................................................................................... 5 A. Regulatory Limits .............................................................................................................................. 5 B. Effluent Concentration Limits ........................................................................................................... 6 C. Average Energy ................................................................................................................................. 6 D. Measurements & Approximations of Total Radioactivity ................................................................. 6 E. Batch Releases .................................................................................................................................. 9 F. Abnormal Releases............................................................................................................................ 9 G. Nonroutine, Planned Discharges ................................................................................................... 12 H. Radioactive Waste System Treatment Changes ............................................................................. 12 I. Land Use Census Changes ............................................................................................................... 13 J. Effluent Monitoring Instrument Inoperability > 30 Days ................................................................ 14 K. Effluent Monitoring Equipment Sample Deviation ......................................................................... 16 L. Offsite Dose Calculation Manual Changes ...................................................................................... 16 M. Groundwater Monitoring Program (NEI 0707) .............................................................................. 17 N. Errata/Corrections to Previous ARERRs .......................................................................................... 19 III. Gaseous Effluents ........................................................................................................................... 20 Table 1A Gaseous Effluents Summation of all Releases for Unit 1 ..................................................... 20 Table 1B Gaseous Effluents Summation of all Releases for Unit 2...................................................... 21 Table 1C Gaseous Effluents - Ground Level Release from Unit 1 (Batch) ............................................. 22 Table 1C Gaseous Effluents - Ground Level Releases from Unit 1 (Continuous) .................................. 23 Table 1D Gaseous Effluents - Ground Level Release from Unit 2 (Batch) ............................................ 24 Table 1D Gaseous Effluents - Ground Level Releases from Unit 2 (Continuous).................................. 25 IV. Liquid Effluents ............................................................................................................................... 26 Table 2A Liquid Effluents Summation of all Releases for Unit 1 ......................................................... 26 Table 2B Liquid Effluents Summation of all Releases for Unit 2.......................................................... 27 Table 2C Liquid Effluents - Unit 1 Batch Mode ..................................................................................... 28 Table 2C Liquid Effluents - Unit 1 Continuous Mode ............................................................................ 29 Table 2D Liquid Effluents - Unit 2 Batch Mode ..................................................................................... 30 Table 2D Liquid Effluents - Unit 2 Continuous Mode............................................................................ 31 V. Solid Waste Storage and Shipment..................................................................................................... 32 A. Types of Solid Waste - Summary .................................................................................................... 32

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Watts Bar Nuclear Power Plant Units 1 and 2 2021 Annual Radioactive Effluent Release Report B. Destination by Carrier ..................................................................................................................... 32 C. Major Nuclides by Waste Class and Stream ................................................................................... 33 D. Irradiated Fuel Shipments ............................................................................................................... 34 E. Solidification of Waste .................................................................................................................... 34 VI. Radiological Impact to Man ............................................................................................................ 35 A. Introduction .................................................................................................................................... 35 B. Dose Limits ...................................................................................................................................... 35 C. Dose Calculations ............................................................................................................................ 35 D. Doses from Airborne Effluents........................................................................................................ 35 E. Doses from Liquid Effluents ............................................................................................................ 37 F. Population Doses ............................................................................................................................ 37 G. Offsite Direct Radiation Dose.......................................................................................................... 38 H. Dose to a Member of the Public Inside the Site Boundary ............................................................. 38 I. Total Dose ....................................................................................................................................... 38 J. Tables .............................................................................................................................................. 40 Table 3A Doses from Unit 1 Airborne Effluents - 1st Quarter ............................................................... 40 Table 3B Doses from Unit 1 Airborne Effluents - 2nd Quarter ............................................................... 41 Table 3C Doses from Unit 1 Airborne Effluents - 3rd Quarter ............................................................... 42 Table 3D Doses from Unit 1 Airborne Effluents - 4th Quarter ............................................................... 43 Table 3E Doses from Unit 2 Airborne Effluents - 1st Quarter ................................................................ 44 Table 3F Doses from Unit 2 Airborne Effluents - 2nd Quarter ............................................................... 45 Table 3G Doses from Unit 2 Airborne Effluents - 3rd Quarter ............................................................... 46 Table 3H Doses from Unit 2 Airborne Effluents - 4th Quarter ............................................................... 47 Table 4A Doses from Unit 1 Liquid Effluents - 1st Quarter .................................................................... 48 Table 4B Doses from Unit 1 Liquid Effluents - 2nd Quarter ................................................................... 48 Table 4C Doses from Unit 1 Liquid Effluents - 3rd Quarter.................................................................... 49 Table 4D Doses from Unit 1 Liquid Effluents - 4th Quarter ................................................................... 49 Table 4E Doses from Unit 2 Liquid Effluents - 1st Quarter .................................................................... 50 Table 4F Doses from Unit 2 Liquid Effluents - 2nd Quarter ................................................................... 50 Table 4G Doses from Unit 2 Liquid Effluents - 3rd Quarter ................................................................... 51 Table 4H Doses from Unit 2 Liquid Effluents - 4th Quarter ................................................................... 51 Table 5 Total Dose from Fuel Cycle ......................................................................................................... 52 VII. Independent Spent Fuel Storage Installation ................................................................................. 53

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Watts Bar Nuclear Power Plant Units 1 and 2 2021 Annual Radioactive Effluent Release Report VIII. Meteorological Data ....................................................................................................................... 54

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Watts Bar Nuclear Power Plant Units 1 and 2 2021 Annual Radioactive Effluent Release Report TABLES TABLE 1A GASEOUS EFFLUENTS SUMMATION OF ALL RELEASES FOR UNIT 1 ............................................................................. 20 TABLE 2B GASEOUS EFFLUENTS SUMMATION OF ALL RELEASES FOR UNIT 2 ............................................................................. 21 TABLE 1C GASEOUS EFFLUENTS - GROUND LEVEL RELEASE FROM UNIT 1 (BATCH) ..................................................................... 22 TABLE 1C GASEOUS EFFLUENTS - GROUND LEVEL RELEASES FROM UNIT 1 (CONTINUOUS) ........................................................... 23 TABLE 1D GASEOUS EFFLUENTS - GROUND LEVEL RELEASE FROM UNIT 2 (BATCH) ..................................................................... 24 TABLE 1D GASEOUS EFFLUENTS - GROUND LEVEL RELEASES FROM UNIT 2 (CONTINUOUS) .......................................................... 25 TABLE 2A LIQUID EFFLUENTS SUMMATION OF ALL RELEASES FOR UNIT 1 ................................................................................. 26 TABLE 2B LIQUID EFFLUENTS SUMMATION OF ALL RELEASES FOR UNIT 2 ................................................................................. 27 TABLE 2C LIQUID EFFLUENTS - UNIT 1 BATCH MODE ............................................................................................................ 28 TABLE 2C LIQUID EFFLUENTS - UNIT 1 CONTINUOUS MODE ................................................................................................... 29 TABLE 2D LIQUID EFFLUENTS - UNIT 2 BATCH MODE ............................................................................................................ 30 TABLE 2D LIQUID EFFLUENTS - UNIT 2 CONTINUOUS MODE ................................................................................................... 31 TABLE 3A DOSES FROM UNIT 1 AIRBORNE EFFLUENTS - 1ST QUARTER ...................................................................................... 40 TABLE 3B DOSES FROM UNIT 1 AIRBORNE EFFLUENTS - 2ND QUARTER ...................................................................................... 41 TABLE 3C DOSES FROM UNIT 1 AIRBORNE EFFLUENTS - 3RD QUARTER ...................................................................................... 42 TABLE 3D DOSES FROM UNIT 1 AIRBORNE EFFLUENTS - 4TH QUARTER ...................................................................................... 43 TABLE 3E DOSES FROM UNIT 2 AIRBORNE EFFLUENTS - 1ST QUARTER ...................................................................................... 44 TABLE 3F DOSES FROM UNIT 2 AIRBORNE EFFLUENTS - 2ND QUARTER ...................................................................................... 45 TABLE 3G DOSES FROM UNIT 2 AIRBORNE EFFLUENTS - 3RD QUARTER...................................................................................... 46 TABLE 3H DOSES FROM UNIT 2 AIRBORNE EFFLUENTS - 4TH QUARTER ...................................................................................... 47 TABLE 4A DOSES FROM UNIT 1 LIQUID EFFLUENTS - 1ST QUARTER ........................................................................................... 48 TABLE 4B DOSES FROM UNIT 1 LIQUID EFFLUENTS - 2ND QUARTER .......................................................................................... 48 TABLE 4C DOSES FROM UNIT 1 LIQUID EFFLUENTS - 3RD QUARTER .......................................................................................... 49 TABLE 4D DOSES FROM UNIT 1 LIQUID EFFLUENTS - 4TH QUARTER .......................................................................................... 49 TABLE 4E DOSES FROM UNIT 2 LIQUID EFFLUENTS - 1ST QUARTER ........................................................................................... 50 TABLE 4F DOSES FROM UNIT 2 LIQUID EFFLUENTS - 2ND QUARTER........................................................................................... 50 TABLE 4G DOSES FROM UNIT 2 LIQUID EFFLUENTS - 3RD QUARTER .......................................................................................... 51 TABLE 4H DOSES FROM UNIT 2 LIQUID EFFLUENTS - 4TH QUARTER .......................................................................................... 51 TABLE 5 TOTAL DOSE FROM FUEL CYCLE ............................................................................................................................... 52

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Watts Bar Nuclear Power Plant Units 1 and 2 2021 Annual Radioactive Effluent Release Report I. Introduction The Annual Radioactive Effluent Release Report covering the operation of both units is submitted pursuant to Watts Bar Nuclear Plant Technical Specification 5.9.3 and Offsite Dose Calculation Manual 5.2.

II. Supplemental Information A. Regulatory Limits

1. Gaseous Effluents Dose rates due to radioactivity released in gaseous effluents from the site to areas at and beyond the unrestricted area boundary shall be limited to the following:

Noble gases Less than or equal to 500 mrem/year to the total body.

Less than or equal to 3000 mrem/year to the skin.

Iodines, tritium and particulates with halflives greater than eight days Less than or equal to 1500 mrem/year to any organ.

Dose to a member of the public shall be limited to the following:

Iodines, tritium and particulates with halflives greater than eight days Less than or equal to 7.5 mrem to any organ during any calendar quarter.

Less than or equal to 15 mrem to any organ during any calendar year.

Air dose due to noble gases Less than or equal to 5 mrad for gamma radiation and less than or equal to 10 mrad for beta radiation during any calendar quarter.

Less than or equal to 10 mrad for gamma radiation and less than or equal to 20 mrad for beta radiation during any calendar year.

2. Liquid Effluents The concentration of radioactivity released in liquid effluents to unrestricted areas shall be limited to 10 times the concentration specified in Title 10 of the Code of Federal Regulations (CFR), Part 20 (Standards for Protection against Radiation), 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 2.0E04 Ci/ml total activity.

The dose or dose commitment to a member of the public from radioactivity in liquid effluents released to unrestricted areas shall be limited to less than or equal to 1.5 mrem to the total body during any calendar quarter, less than or equal to 5 mrem to any organ during any calendar quarter, less than or equal to 3 mrem to the total body during any calendar year and less than or equal to 10 mrem to any organ during any calendar year.

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Watts Bar Nuclear Power Plant Units 1 and 2 2021 Annual Radioactive Effluent Release Report B. Effluent Concentration Limits

1. Gaseous Effluents Concentration limits for gaseous releases are met through compliance with the maximum permissible dose rates for gaseous releases as defined in plant Offsite Dose Calculation Manual (ODCM) and presented in Section II subsection A.1 of this report.

2. Liquid Effluents The effluent concentration limits (ECL) for liquids are those listed in 10 CFR 20, Appendix B, Table 2, Column 2. For dissolved and entrained gases, the ECL of 2.0E04 Ci/ml is applied. This ECL is based on the Xe135 concentration in air (submersion dose) converted to an equivalent concentration in water as discussed in the International Commission on Radiological Protection (ICRP), Publication 2.

C. Average Energy Watts Bar Nuclear Plant's (WBN) 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. Therefore, the average beta and gamma energies (E) for gaseous effluents as described in Regulatory Guide 1.21 Revision 1, "Measuring, Evaluation, and Reporting Radioactivity in Solid Wastes and Releases of Radioactive Materials in Liquid and Gaseous Effluents from LightWaterCooled Nuclear Power Plants," are not applicable.

D. Measurements & Approximations of Total Radioactivity Radioactivity measurements performed in support of the Watt Bar Nuclear Power Plant ODCM meet the Lower Limit of Detection requirements given in ODCM Table 2.21 and Table 2.22.

1. Gaseous Effluents Fission and Activation Gases Airborne effluent gaseous activity is continuously monitored and recorded. Weekly grab samples from the auxiliary building and monthly grab samples from the service building are taken and analyzed to determine the quantity of noble gas activity released based on the total flows for the sample period. Also, noble gas samples are collected and evaluated following startup, shutdown or rated thermal power change exceeding 15 percent within one hour. Sampling is only required if dose equivalent I131 concentration in the primary coolant has increased more than a factor of three or if the noble gas activity monitor indicates that the containment activity has increased more than a factor of three.

The concentration of noble gases released through the shield building exhausts due to purging containment is determined by using the purge monitor response in combination with containment air samples obtained prior to each purge. The quantity of activity released during the purge is determined using the duration, flowrate, and concentration of noble gases for each purge. Also, noble gas samples are collected and evaluated for ongoing containment purges following startup, shutdown, or rated thermal power change exceeding 15 percent within one hour. Sampling is only required if DEI concentration in the primary coolant has increased more than a factor of three or if the noble gas activity monitor shows that the containment activity has increased more than a factor of three.

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Watts Bar Nuclear Power Plant Units 1 and 2 2021 Annual Radioactive Effluent Release Report The quantity of noble gases released through the shield building exhausts due to the batch release of waste gas decay tanks are determined by sampling each tank prior to release. Total activity released is determined from total tank pressure change recorded during the release.

Iodines and Particulates in Gaseous Releases lodine and particulate activity are continuously sampled. Weekly charcoal and particulate samples are taken from the shield building exhausts and auxiliary building exhaust and from the condenser vacuum exhausts during periods of primary to secondary leakage. These samples are analyzed at least weekly to determine the total activity released from the plant based on the total vent flows recorded for the sampling period. Also, particulate and charcoal samples are taken from the shield building exhausts, auxiliary building exhaust, and (when a primary to secondary leak exists) condenser vacuum exhausts once per 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months for 7 days following startup, shutdown, or a rated thermal power change exceeding 15 percent within one hour if dose equivalent l 131 concentration in the primary coolant or the noble gas activity monitor shows that the containment activity has increased more than a factor of three.

Carbon14 in Gaseous Releases The Carbon14 production and effluent source term estimates were based on EPRI methodology provided in EPRI Report 1021106, "Estimation of Carbon14 in Nuclear Power Plant Gaseous Effluents," dated December 2010. It was determined in 2021 that 9.43 curies of Carbon14 was generated from Unit 1 and 9.63 curies of Carbon14 was generated from Unit 2. However, only 98% is considered released as gas and only the carbon dioxide form (20%) of that is used in the gaseous dose calculations.

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Watts Bar Nuclear Power Plant Units 1 and 2 2021 Annual Radioactive Effluent Release Report

2. Liquid Effluents Batch (Radwaste and Condensate Demineralizer Drains)

Total gamma isotopic and tritium concentrations are determined on each radwaste batch tank prior to release. The total activity of a batch release is obtained by determining the concentration of each nuclide and then multiplying by the volume discharged to arrive at the curie activity for each nuclide. The curies of each nuclide are then summed. Composite samples are maintained and analyzed monthly for gross alpha and quarterly for iron55, strontium89, and strontium90. During periods of no significant identified primary to secondary leakage, composite samples are not maintained for batch releases from the condensate demineralizer tank releases. During periods of no significant identified primary to secondary leakage or when the condensate demineralizer tanks are discharged to the turbine building station sump, the feedwater tritium concentrations are used to determine the curies of tritium released from condensate demineralizer tank.

Continuous Releases (Turbine Building Station Sump (TBSS), Steam Generator Blowdowns (SGB), and Groundwater Sump (GWS))

During periods of no significant identified primary to secondary leakage, the volume released from the TBSS and SGB's are obtained. The TBSS tritium concentration is determined via weekly grab samples. The feedwater tritium concentrations are used to determine the curies of tritium released from SGB's. The GWS is sampled monthly and analyzed for gross gamma and tritium on a monthly basis, and for Sr89, Sr90, and Ni63 on a quarterly basis. The total activity released is obtained by determining the concentration of each nuclide and then multiplying by the volume discharged to arrive at the curie activity for each nuclide.

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Watts Bar Nuclear Power Plant Units 1 and 2 2021 Annual Radioactive Effluent Release Report E. Batch Releases

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

1. Gaseous

1. Number of Batch 22 24 26 27 99 Releases

2. Total duration of minutes 3.81E+04 2.71E+04 1.31E+05 7.84E+04 2.75E+05 batch releases

3. Maximum batch minutes 4.87E+03 4.75E+03 5.67E+04 3.29E+04 5.67E+04 release duration

4. Average batch minutes 1.73E+03 1.13E+03 5.04E+03 2.90E+03 2.77E+03 release duration

5. Minimum batch minutes 4.00E+00 5.00E+00 1.40E+01 2.10E+01 4.00E+00 release duration

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

1. Liquids

1. Number of Batch 15 25 31 35 106 Releases

2. Total duration of minutes 3.79E+03 7.10E+03 7.95E+03 1.23E+04 3.11E+04 batch releases

3. Maximum batch minutes 5.02E+02 9.55E+02 4.35E+02 3.31E+03 3.31E+03 release duration

4. Average batch minutes 2.53E+02 2.84E+02 2.56E+02 3.51E+02 2.94E+02 release duration

5. Minimum batch minutes 1.50E+02 2.50E+01 1.35E+02 9.00E+01 2.50E+01 release duration F. Abnormal Releases

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

1. Gaseous

1. Number of 0 1 0 1 2 Abnormal Releases

2. Total activity of Ci 0.00E+00 1.11E03 0.00E+00 5.96E04 3.92E03 abnormal releases

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Watts Bar Nuclear Power Plant Units 1 and 2 2021 Annual Radioactive Effluent Release Report Unit 1 Steam Generator PORVs (10/29/21 through 12/01/21)

This evaluation is for the release to the environment that occurred from the Unit 1 Steam Generator PORVs during Unit 1 Refueling Outage 17. The PORV valves were opened and closed during this period of time.

The following is data used to show no dose impact of the release:

While all the PORVs were not open continuously during this period, the evaluation assumed the release was continuous from all four PORVs.

There have been no gamma emitting radionuclides identified in any Secondary Coolant samples.

The feedwater tritium results obtained on 10/25/2021 indicated a tritium concentration of 1.108E06 µCi/mL. This tritium concentration is assumed to have been the initial concentration with no additional tritium introduced into the steam generators during the release period. All of the tritium initially present in the steam generators was assumed to have been released through the PORVs from 10/29/2021 through 12/01/2021.

The volume of each steam generator was taken from Westinghouse Guidelines for Secondary Water Chemistry. The listed normal water level value of 4750 ft3 was used as a conservative value. This calculation conservatively assumes that the total volume of all four generators was released and that all the tritium present in that initial volume was released. The calculation for the total tritium activity released is as follows:

4750 ft3/generator

2.832E+04 mL/ft3

4 generators = 5.38E+08 mL 1.108E06 µCi/mL

5.38E+08 mL = 5.96E+02 µCi (5.96E04 Ci) of H3 for 4th quarter The activity of 5.96E04 curies of H3 was added to the 4th quarter Table 1C and Table 3D. The addition of 5.96E04 curies of tritium did not have any impact on changing the dose values for the 4th quarter of 2021.

Individual Doses 4th Quarter U1 Steam Generator PORV Release Pathway Dose Quarterly Limit Percent of Limit Location Beta Air 0.00E+00 mrad 1.00E+01 mrad 0.00E+00 N/A Gamma Air 0.00E+00 mrad 5.00E+00 mrad 0.00E+00 N/A NG Skin 0.00E+00 mrad N/A N/A N/A NG Total Body 0.00E+00 mrad N/A N/A N/A Organ Doses (Iodine, Tritium, Particulates with >8Day halflife)

Child / Thyroid 8.93E07 mrem 7.5 mrem 1.19E05 SE 1409 meters Child / Total 8.93E07 mrem 7.5 mrem 1.19E05 SE 1409 meters Body Population Doses 4th Quarter U1 Steam Generator PORV Release Total Body Dose 4.24E06 manrem Maximum Organ Dose (Organ) 4.24E06 manrem (Bone, GILLI, Kidney, Liver, Lung, Thyroid)

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Watts Bar Nuclear Power Plant Units 1 and 2 2021 Annual Radioactive Effluent Release Report Unit 2 Steam Generator PORVs (09/12/21 through 09/28/21)

This evaluation is for the release to the environment that occurred from the Unit 2 Steam Generator PORVs in 2021 due to Unit 2 midcycle outage. The PORV valves were opened and closed during these periods of time.

The following is data used to show no dose impact of the release:

While all the PORVs were not open continuously during this period, the evaluation assumed the release was continuous from all four PORVs.

There have been no gamma emitting radionuclides identified in any Secondary Coolant samples.

The feedwater tritium results obtained on 09/06/2021 indicated a tritium concentration of 6.892E06 µCi/mL. This tritium concentration is assumed to have been the initial concentration with no additional tritium introduced into the steam generators during the release period. All of the tritium initially present in the steam generators was assumed to have been released through the PORVs from 09/12/2021 through 09/28/2021.

The volume of each steam generator was taken from Westinghouse Guidelines for Secondary Water Chemistry. The listed normal water level value of 4250 ft3 was used as a conservative value. This calculation conservatively assumes that the total volume of all four generators was released and that all the tritium present in that initial volume was released. The calculation for the total tritium activity released is as follows:

4250 ft3/generator

2.832E+04 mL/ft3

4 generators = 4.81E+08 mL 6.892E06 µCi/mL

4.81E+08 mL = 3.32E+03 µCi (3.32E03 Ci) of H3 for 3rd quarter The activity of 3.32E03 curies of H3 was added to the 3rd quarter Table 1D and Table 3G. The addition of 3.32E03 curies of tritium did not have any impact on changing the dose values for the 3rd quarter of 2021.

Individual Doses 3rd Quarter U2 Steam Generator PORV Release Pathway Dose Quarterly Limit Percent of Limit Location Beta Air 0.00E+00 mrad 1.00E+01 mrad 0.00E+00 N/A Gamma Air 0.00E+00 mrad 5.00E+00 mrad 0.00E+00 N/A NG Skin 0.00E+00 mrad N/A N/A N/A NG Total Body 0.00E+00 mrad N/A N/A N/A Organ Doses (Iodine, Tritium, Particulates with >8Day halflife)

Child / Thyroid 3.53E06 mrem 7.5 mrem 4.71E05 NE 3661 meters Child / Total 3.53E06 mrem 7.5 mrem 4.71E05 NE 3661 meters Body Population Doses 3rd Quarter U2 Steam Generator PORV Release Total Body Dose 2.16E05 manrem Maximum Organ Dose (Organ) 2.16E05 manrem (Bone, GILLI, Kidney, Liver, Lung, Thyroid)

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Watts Bar Nuclear Power Plant Units 1 and 2 2021 Annual Radioactive Effluent Release Report

2. Liquid In calendar year 2021 there were no abnormal liquid releases.

G. Nonroutine, Planned Discharges In calendar year 2021 there were no nonroutine planned discharges.

H. Radioactive Waste System Treatment Changes In calendar year 2021 there were no changes to the radwaste system. The process control program was revised to include correct references for the Concentration Averaging and Encapsulation Branch Technical Position revision 1 Volume 1 U.S. Nuclear Regulatory Commission Office of Nuclear Material Safety and Safeguard February 2015.

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Watts Bar Nuclear Power Plant Units 1 and 2 2021 Annual Radioactive Effluent Release Report I. Land Use Census Changes Receptor Receptor Distance Terrain Adj.

Number Type* Sector (m) Factor 1 NR N 4474 1.5 2 NR NNE 3556 1.8 3 NR NE 3399 2.3 4 NR ENE 3072 1.9 5 NR E 4388 1.6 6 NR ESE 4654 1.8 7 NR SE 1409 1.5 8 NR SSE 1646 1.5 9 NR S 1550 1.8 10 NR SSW 1832 1.9 11 NR SW 4223 2.0 12 NR WSW 2422 1.7 13 NR W 2901 1.1 14 NR WNW 1448 2.5 15 NR NW 1903 1.6 16 NR NNW 4376 1.0 17 NG N 6295 1.1 18 NG NNE 5030 1.6 19 NG NE 3661 2.2 20 NG ENE 4623 1.7 21 NG E 4712 1.6 22 NG ESE 6916 1.7 23 NG SE 1409 1.5 24 NG SSE 8100 1.0 25 NG S 3568 2.0 26 NG SSW 2286 2.0 27 NG SW 8100 1.7 28 NG WSW 2422 1.7 29 NG W 3701 1.0 30 NG WNW 2110 2.9 31 NG NW 2065 1.5 32 NG NNW 4406 1.0 33 MC ESE 6706 1.7 Note Changes from previous years land use file are marked in bold

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Watts Bar Nuclear Power Plant Units 1 and 2 2021 Annual Radioactive Effluent Release Report J. Effluent Monitoring Instrument Inoperability > 30 Days Date Instrument Explanation 12/16/20 ODCM 1/2.1.2 1RM90400 (Unit 1 Shield Building Exhaust Radiation Control 1.1.2 Monitor) was declared inoperable on 12/16/20 at 02:02 due Table 1.12 to the sample pump intermittently tripping (CR #1659169).

Item 4.a,b 1RM90400 was declared operable on 1/20/21 at 09:13 after power was restored and the database was reloaded.

CR #1664633 was written to document inoperability exceeding 30 days.

1/24/21 ODCM 1/2.1.1 0RM90134 (ERCW effluent header radiation monitor) was Control 1.1.1 declared inoperable on 1/24/21 at 12:30 for 1RM90119 Table 1.11 replacement (DCP 18160), with 0RM90141 already Item 2.a inoperable. 0RM90134 was declared operable on 3/2/21 at 17:25 after the power supply to the new radiation monitor had been restored. CR #1673920 was written to document inoperability exceeding 30 days.

1/24/21 ODCM 1/2.1.2 1RM90119 (U1 Condenser Vacuum Exhaust radiation Control 1.1.2 monitor) was declared inoperable on 1/24/21 at 12:30 for Table 1.12 radiation monitor replacement (DCP 18160). 1RM90119 Item 2.a was declared operable after the power supply to the new radiation monitor had been restored. CR #1673918 was written to document inoperability exceeding 30 days.

3/17/21 ODCM 1/2.1.1 0RM90212 (Turbine Building Sump effluent radiation Control 1.1.1 monitor) was declared inoperable on 3/17/21 at 12:20 due Table 1.11 to instrument malfunction alarm caused by the junction box Item 1.a getting flooded and detector damage during the Unit 2 plant trip (see CR #1679452). Repair of the monitor has been delayed due to unavailability of parts. CR #1687006 was written to document inoperability exceeding 30 days.

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Watts Bar Nuclear Power Plant Units 1 and 2 2021 Annual Radioactive Effluent Release Report J. Effluent Monitoring Instrument Inoperability > 30 Days (Continued)

Date Instrument Explanation 3/26/21 ODCM 1/2.1.2 0FI90300/1B (Auxiliary Building Ventilation System Control 1.1.2 effluent flow rate measuring device) was declared Table 1.12 inoperable on 3/26/21 at 05:27 due to failed flow Item 4.c transmitter (see CR #1681672). Action B (flow estimates once per four hours) was entered and remained in place until 4/14/21. After the flow transmitter was repaired (WO #122033719), 0FI90300/1B remained inoperable due to exhaust fan malfunction resulting in effluent flowrate less than 100,000 scfm. On 4/14/21 at 14:55, sample loop 0LPF 90300 flowrate was manually adjusted to 20 scfm, at which point ODCM Action L was entered, and Action B was exited.

WO #121823233 is in place to repair the exhaust fan, which will allow restoration of 0FI90300/1B to operable and exiting ODCM actions. 0FI90300/1B was declared operable on 5/13/21 at 20:45 following MIG restoration of sample flow to auto and two trains of Aux Building Exhaust in service. CR #1693376 was written to document inoperability exceeding 30 days.

10/5/21 ODCM 1/2.1.2 2FE2256 (Unit 2 Condenser Vacuum Exhaust Flow Rate Control 1.1.2 Monitor) was declared inoperable on 10/5/21 at 21:43 due Table 1.12 to erratic flow (see CR #1726176). CR #1734451 was written Item 2.c to document inoperability exceeding 30 days.

11/6/21 ODCM 1/2.1.2 1RM90400 (Unit 1 Shield Building Exhaust Radiation Control 1.1.2 Monitor) and 1FI90400 (Unit 1 Shield Building Exhaust Table 1.12 Effluent Flow Rate Measuring Device) were declared Item 4.a,b,c inoperable on 11/6/21 at 16:45 for DCN WBN18160. 1RM 90400 and 1FI90400 declared operable following replacement of radiation monitor and calibration on 2/8/22 at 14:30. CR #1741909 was written to document inoperability exceeding 30 days.

11/14/21 ODCM 1/2.1.2 0RE90101 (Auxiliary Building Ventilation System Control 1.1.2 iodine/particulate sampler) was declared inoperable on Table 1.12 11/14/21 at 00:48 due to instrument malfunction Item 4.b annunciator lit and lack of response from source check (CR

1735781). 0RE90101 was declared operable on 12/31/21 at 08:00 after the particulate channel operate light was lit and the instrument malfunction was cleared. CR #1735781 was written to document inoperability exceeding 30 days.

[15]

WBL-22-019 E17 of 77

Watts Bar Nuclear Power Plant Units 1 and 2 2021 Annual Radioactive Effluent Release Report K. Effluent Monitoring Equipment Sample Deviation Date Instrument Explanation 1/19/21 ODCM 1/2.1.1 On 1/19/21 at 14:23, ODCM Action C was entered for Control 1.1.1 inoperability of 0RM90133 & 0RM90140, requiring grab Table 1.11 samples to be sampled and analyzed for gamma activity Item 2.a once per 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months . Per 0ODI904, samples are required to be obtained from the ERCW side of CCS HX B and CCS HX C.

A sample was obtained from CCS HX B as required on 1/19/21 at 21:00, but no sample was obtained from CCS HX C until 1/20/21 at 10:00, 19.6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months after entry into ODCM Action C, exceeding the required sample time of once per 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months . The missed sample was discovered during effluents chemist review of 0ODI904. This is a deviation from the ODCM and will require reporting in the 2021 Annual Radioactive Effluent Release Report.

L. Offsite Dose Calculation Manual Changes In calendar year 2021 there was no revisions to the Offsite Dose Calculation Manual.

Revision 06 is attached.

[16]

WBL-22-019 E18 of 77

Watts Bar Nuclear Power Plant Units 1 and 2 2021 Annual Radioactive Effluent Release Report M.Groundwater Monitoring Program (NEI 0707)

Monitoring Wells Watts Bar has six (6) radiological environmental monitoring program (REMP) onsite groundwater monitoring wells and 22 nonREMP monitoring wells. These wells support monitoring the onsite groundwater plume for the presence or increase of radioactivity.

WBN contracts ARCADIS to perform investigations of the impact tritium has on groundwater and to perform site characterizations, area of impact, and preliminary human health and ecological risk screening.

The nonREMP monitoring wells are sampled at least semiannually for gamma and tritium. No gamma activity was detected in any groundwater wells in 2021. In September 2021, the quarterly Well R and S samples indicated tritium activity above the Nuclear Energy Institute Groundwater Protection Initiative voluntary communication threshold of 20,000 pCi/L. Voluntary communication was initiated to the State of Tennessee and local officials. The cause was identified as the Liquid Radiological Waste (LRW) line. On October 22, 2021, TVA stopped releasing water through the LRW line. A temporary line was set up until a new permanent line can be constructed.

All other groundwater monitoring wells continue to exhibit a stable trend and historical average tritium decreasing over time. MW09 and Well K,R,S were also analyzed for Sr89, Sr90, Fe55, and Ni63, with no detectable activity.

[17]

WBL-22-019 E19 of 77

Watts Bar Nuclear Power Plant Units 1 and 2 2021 Annual Radioactive Effluent Release Report Monitoring Well Sample Results (pCi/L)

Well ID March June September December 2021 2021 2021 2021 D < 297 < 294 < 239 E < 295 < 301 < 242 G < 289 < 259 I < 295 < 315 503 593 J < 268 < 282 < 297 K 1860 1490 1170 1200 L 705 < 313 529 2350 M < 276 < 308 < 286 O < 305 < 310 1240 P < 291 400 364 Q < 277 < 309 < 293 R 258 308 1.57E+05 1.82E+05 S 318 7.47E+05 3.36E+05 V < 271 < 281 MW06 436 467 < 256 < 339 MW08 < 294 < 243 MW09 8240 4720 5550 6780

< 290 < 324 642 < 337 MW10

< 248*

MW11i < 296 < 246 MW11s < 305 < 238 MW12 < 299 < 307 < 258 < 336 MW13 < 298 < 246

MW10 was resampled on 10/28/21.

Doses from l131 Water lngestion Pathway The REMP specified in Table 3.121 from NUREG 1301, "Offsite Does Calculation Manual Guidance: Standard Radiological Effluent Controls for Pressurized Water Reactors," April 1991, requires an I131 specific analysis for drinking water pathway samples if the annual dose from I131 is greater than 1 mrem. To evaluate the need for implementation of this additional analysis, the drinking water pathway dose from I131 to the maximum organ and age group was evaluated. Therefore, the evaluation confirms that the drinking water pathway dose from I131 was less than the 1 mrem limit and that the performance of the I131 specific analysis is not required for WBN REMP drinking water samples.

1st 2nd 3rd 4th Total Quarter Quarter Quarter Quarter I131 Ci 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 Child/Thyroid 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 (mrem)

Population/Thyroid 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 (mrem)

[18]

WBL-22-019 E20 of 77

Watts Bar Nuclear Power Plant Units 1 and 2 2021 Annual Radioactive Effluent Release Report N. Errata/Corrections to Previous ARERRs There are no correction to previous ARERRs.

[19]

WBL-22-019 E21 of 77

Watts Bar Nuclear Power Plant Units 1 and 2 2021 Annual Radioactive Effluent Release Report III. Gaseous Effluents Table 1A Gaseous Effluents Summation of all Releases for Unit 1 Units 1st 2nd 3rd 4th Total Error %

Quarter Quarter Quarter Quarter A. Fission and Activation Gases

1. Total Release Curies 2.00E+01 8.95E+00 1.03E+01 8.42E+00 4.76E+01 22%

2. Average Release Rate for uCi/sec 2.57E+00 1.14E+00 1.29E+00 1.06E+00 1.51E+00 Period

3. Percent of Tech Spec Limit % * * * *

B. Iodines

1. Total Release Curies 4.29E-06 8.30E-06 5.07E-06 7.45E-06 2.51E-05 12%

2. Average Release Rate for uCi/sec 5.51E-07 1.06E-06 6.38E-07 9.37E-07 7.96E-07 Period

3. Percent of Tech Spec Limit % * * * *

C. Particulates

1. Total Release Curies 7.86E-06 2.43E-05 1.65E-07 1.15E-04 1.47E-04 15%

2. Average Release Rate for uCi/sec 1.01E-06 3.09E-06 2.07E-08 1.44E-05 4.66E-06 Period

3. Percent of Tech Spec Limit % * * * *

D. Tritium

1. Total Release Curies 1.51E+01 1.83E+01 5.26E+01 4.37E+01 1.29E+02 11%

2. Average Release Rate for uCi/sec 1.94E+00 2.32E+00 6.61E+00 5.50E+00 4.11E+00 Period

3. Percent of Tech Spec Limit % * * * * *

4. Tritium from Operating as a Curies 1.25E+01 1.51E+01 4.36E+01 3.63E+01 1.07E+02 Tritium Producing Core (TPC)

5. Adjusted Tritium without Curies 2.56E+00 3.10E+00 8.94E+00 7.43E+00 2.20E+01 TPC Contribution E. Gross Alpha

1. Total Release Curies 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 N/A

2. Average Release Rate for uCi/sec 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 Period

3. Percent of Tech Spec Limit % * * * *

F. Carbon14

1. Total Release Curies 2.84E+00 2.87E+00 2.90E+00 0.82E+00 9.43E+00 N/A

2. Average Release Rate for uCi/sec 3.65E01 3.65E01 3.65E01 1.03E01 3.00E00 Period

3. Percent of Tech Spec Limit % * * * * *

Applicable limits are expressed in terms of dose. See Table 3A through 3D of this report.

[20]

WBL-22-019 E22 of 77

Watts Bar Nuclear Power Plant Units 1 and 2 2021 Annual Radioactive Effluent Release Report Table 1B Gaseous Effluents Summation of all Releases for Unit 2 Units 1st 2nd 3rd 4th Total Error %

Quarter Quarter Quarter Quarter A. Fission and Activation Gases

1. Total Release Curies 3.95E+00 2.17E+00 1.25E+01 2.22E+01 4.08E+01 22%

2. Average Release Rate for uCi/sec 5.08E-01 2.76E-01 1.58E+00 2.79E+00 1.29E+00 Period

3. Percent of Tech Spec Limit % * * * *

B. Iodines

1. Total Release Curies 2.14E-06 5.98E-06 7.91E-06 7.09E-06 2.31E-05 12%

2. Average Release Rate for uCi/sec 2.75E-07 7.60E-07 9.95E-07 8.92E-07 7.33E-07 Period

3. Percent of Tech Spec Limit % * * * *

C. Particulates

1. Total Release Curies 7.79E-06 2.43E-05 0.00E+00 1.15E-04 1.47E-04 15%

2. Average Release Rate for uCi/sec 1.00E-06 3.09E-06 0.00E+00 1.44E-05 4.65E-06 Period

3. Percent of Tech Spec Limit % * * * *

D. Tritium

1. Total Release Curies 4.25E+00 5.15E+00 1.48E+01 1.23E+01 3.65E+01 11%

2. Average Release Rate for uCi/sec 5.46E01 6.55E01 1.87E+00 1.55E+00 1.16E+00 Period

3. Percent of Tech Spec Limit % * * * * *

4. Tritium from Operating as a Curies 2.55E+00 3.09E+00 8.90E+00 7.39E+00 2.19E+01 Tritium Producing Core (TPC)

5. Adjusted Tritium without Curies 1.70E+00 2.06E+00 5.93E+00 4.93E+00 1.46E+01 TPC Contribution E. Gross Alpha

1. Total Release Curies 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 N/A

2. Average Release Rate for uCi/sec 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 Period

3. Percent of Tech Spec Limit % * * * *

F. Carbon14

1. Total Release Curies 2.47E+00 2.52E+00 1.99E+00 2.65E+00 9.63E+00 N/A

2. Average Release Rate for uCi/sec 3.17E01 3.21E01 2.50E01 3.33E01 3.05E01 Period

3. Percent of Tech Spec Limit % * * * * *

Applicable limits are expressed in terms of dose. See Table 3E through 3H of this report.

[21]

WBL-22-019 E23 of 77

Watts Bar Nuclear Power Plant Units 1 and 2 2021 Annual Radioactive Effluent Release Report Table 1C Gaseous Effluents - Ground Level Release from Unit 1 (Batch)

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

1. Fission and Activation Gases Ar41 Ci 1.76+01 8.11E+00 9.10E+01 8.09E+00 4.29E+01 Kr85m Ci 1.07E02 2.61E06 9.79E03 5.81E03 2.63E02 Kr87 Ci 0.00E+00 2.07E02 0.00E+00 0.00E+00 2.07E02 Kr88 Ci 0.00E+00 0.00E+00 0.00E+00 3.19E05 3.19E05 Xe133m Ci 0.00E+00 2.20E05 3.03E04 4.54E04 7.79E04 Xe133 Ci 2.13E+00 7.33E01 1.13E+00 1.55E01 4.15E+00 Xe135m Ci 7.94E02 4.50E02 0.00E+00 0.00E+00 1.15E01 Xe135 Ci 1.19E01 3.60E02 8.53E03 4.02E02 2.05E01 Xe138 Ci 1.95E02 3.66E02 9.45E06 1.32E01 1.70E01 Total For Period Ci 2.00+01 8.95E+00 1.03E+01 8.42E+00 4.76E+01

2. Iodines Total For Period Ci 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00

3. Particulates Total For Period Ci 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00

4. Gross Alpha Gross Alpha Ci 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00

5. Tritium H3 Ci 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00

6. Carbon14 C14 (Total) Ci 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 C14 (CO2 Form) Ci 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00

[22]

WBL-22-019 E24 of 77

Watts Bar Nuclear Power Plant Units 1 and 2 2021 Annual Radioactive Effluent Release Report Table 1C Gaseous Effluents - Ground Level Releases from Unit 1 (Continuous)

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

1. Fission and Activation Gases Total For Period Ci 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00

2. Iodines Br82 Ci 2.63E06 3.10E06 4.16E06 3.25E06 1.31E05 I131 Ci 5.50E07 2.46E07 9.11E07 1.71E06 3.42E06 I133 Ci 1.11E06 4.96E06 0.00E+00 2.48E06 8.54E06 Total For Period Ci 4.29E06 8.30E06 5.07E06 7.45E06 2.51E05

3. Particulates Cr51 Ci 0.00E+00 0.00E+00 6.82E08 1.97E05 1.98E05 Mn54 Ci 0.00E+00 2.59E06 0.00E+00 3.38E06 5.97E06 Co57 Ci 9.52E07 0.00E+00 0.00E+00 3.08E07 1.26E06 Co58 Ci 6.65E08 7.22E06 8.97E08 5.05E05 5.79E05 Co60 Ci 6.84E06 1.44E05 6.67E09 2.73E05 4.86E05 Zr95 Ci 0.00E+00 0.00E+00 0.00E+00 3.23E06 3.23E06 Nb95 Ci 0.00E+00 0.00E+00 0.00E+00 6.22E06 6.22E06 Sb125 Ci 0.00E+00 0.00E+00 0.00E+00 3.86E06 3.86E06 Total For Period Ci 7.86E06 2.43E05 1.65E07 1.15E04 1.47E04

4. Gross Alpha Gross Alpha Ci 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00

5. Tritium H3 Ci 1.51E+01 1.83E+01 5.26E+01 4.370E+01 1.29E+02

6. Carbon14 C14 (Total) Ci 2.84E+00 2.87E+00 2.90E+00 8.18E01 9.43E+00 C14 (CO2 Form) Ci 5.68E01 5.75E01 5.81E01 1.64E01 1.89E+00

[23]

WBL-22-019 E25 of 77

Watts Bar Nuclear Power Plant Units 1 and 2 2021 Annual Radioactive Effluent Release Report Table 1D Gaseous Effluents - Ground Level Release from Unit 2 (Batch)

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

1. Fission and Activation Gases Ar41 Ci 3.95E+00 2.13E+00 1.25E+01 2.22E+01 4.08E+01 Xe131m Ci 6.63E05 0.00E+00 9.61E05 0.00E+00 1.62E04 Xe133m Ci 0.00E+00 0.00E+00 1.57E04 0.00E+00 1.57E04 Xe133 Ci 7.68E05 1.28E02 1.72E02 0.00E+00 3.01E02 Xe135 Ci 0.00E+00 1.38E02 1.03E04 0.00E+00 1.39E02 Xe138 Ci 0.00E+00 6.24E03 0.00E+00 0.00E+00 6.24E03 Total For Period Ci 3.95E+00 2.17E+00 1.25E+01 2.22E+01 4.08E+01

2. Iodines Total For Period Ci 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00

3. Particulates Total For Period Ci 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00

4. Gross Alpha Gross Alpha Ci 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00

5. Tritium H3 Ci 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00

6. Carbon14 C14 (Total) Ci 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 C14 (CO2 Form) Ci 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00

[24]

WBL-22-019 E26 of 77

Watts Bar Nuclear Power Plant Units 1 and 2 2021 Annual Radioactive Effluent Release Report Table 1D Gaseous Effluents - Ground Level Releases from Unit 2 (Continuous)

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

1. Fission and Activation Gases Total For Period Ci 0.00E+00 0.00E+00 1.78E+00 0.00E+00 0.00E+00

2. Iodines Br82 Ci 4.82E07 8.78E07 6.83E06 2.90E06 1.11E05 I131 Ci 5.50E07 2.46E07 1.08E06 1.71E06 3.59E06 I133 Ci 1.11E06 4.85E06 0.00E+00 2.48E06 8.44E06 Total For Period Ci 2.14E06 5.98E06 7.91E06 7.09E06 2.31E05

3. Particulates Cr51 Ci 0.00E+00 0.00E+00 0.00E+00 1.97E05 1.97E05 Mn54 Ci 0.00E+00 2.59E06 0.00E+00 3.38E06 5.97E06 Co57 Ci 9.52E07 0.00E+00 0.00E+00 3.19E07 1.27E06 Co58 Ci 0.00E+00 7.22E06 0.00E+00 5.05E05 5.77E05 Co60 Ci 6.84E06 1.44E05 0.00E+00 2.73E05 4.86E05 Zr95 Ci 0.00E+00 0.00E+00 0.00E+00 3.23E06 3.23E06 Nb95 Ci 0.00E+00 0.00E+00 0.00E+00 6.22E06 6.22E06 Sb125 Ci 0.00E+00 0.00E+00 0.00E+00 3.86E06 3.86E06 Total For Period Ci 7.79E06 2.43E05 0.00E+00 1.15E04 1.47E04

4. Gross Alpha Gross Alpha Ci 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00

5. Tritium H3 Ci 4.25E+00 5.15E+00 1.48E+01 1.23E+01 3.65E+01

6. Carbon14 C14 (Total) Ci 2.47E+00 2.52E+00 1.99E+00 2.65E+00 9.63E+00 C14 (CO2 Form) Ci 4.93E01 5.05E01 3.98E01 5.30E01 1.93E+00

[25]

WBL-22-019 E27 of 77

Watts Bar Nuclear Power Plant Units 1 and 2 2021 Annual Radioactive Effluent Release Report IV. Liquid Effluents Table 2A Liquid Effluents Summation of all Releases for Unit 1 Units 1st 2nd 3rd 4th Total Error %

Quarter Quarter Quarter Quarter A. Fission and Activation Products

1. Total Release Curies 0.00E+00 0.00E+00 0.00E+00 3.42E02 3.42E02 25%

2. Average Diluted Concentration uCi/mL 0.00E+00 0.00E+00 0.00E+00 4.83E09 5.81E10

3. Percent of Tech Spec Limit % * * * *

B. Tritium

1. Total Release Curies 4.45E+02 1.21E+03 2.22E+03 2.57E+03 6.44E+03 18%

2. Average Diluted Concentration uCi/mL 2.30E05 6.42E05 1.63E04 3.64E04 1.09E04

3. Percent of Tech Spec Limit % * * * * *

4. Tritium from Operating as a Curies 3.70E+02 1.05E+03 1.93E+03 2.25E+03 5.62E+03 Tritium Producing Core (TPC)

5. Adjusted Tritium without TPC Curies 7.57E+01 1.54E+02 2.83E+02 3.29E+02 8.23E+02 Contribution C. Dissolved and Entrained Noble Gases

1. Total Release Curies 3.49E05 6.30E05 5.05E04 9.70E04 1.57E03 39%

2. Average Diluted Concentration uCi/mL 1.80E12 3.35E12 3.71E11 1.37E10 2.67E11

3. Percent of Tech Spec Limit % * * * *

D. Gross Alpha Radioactivity

1. Total Release Curies 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 N/A E. Volume of Liquid Waste to Liters 3.70E+08 4.57E+08 4.26E+08 4.86E+08 1.74E+09 2%

Discharge Canal (prior to dilution)

F. Volume of Dilution Water for Liters 1.94E+10 1.88E+10 1.36E+10 7.08E+09 5.89E+10 12%

Period

Applicable limits are expressed in terms of dose. See Table 4A through 4D of this report.

[26]

WBL-22-019 E28 of 77

Watts Bar Nuclear Power Plant Units 1 and 2 2021 Annual Radioactive Effluent Release Report Table 2B Liquid Effluents Summation of all Releases for Unit 2 Units 1st 2nd 3rd 4th Total Error %

Quarter Quarter Quarter Quarter A. Fission and Activation Products

1. Total Release Curies 0.00E+00 0.00E+00 0.00E+00 3.42E02 3.42E02 25%

2. Average Diluted Concentration uCi/mL 0.00E+00 0.00E+00 0.00E+00 2.48E09 5.35E10

3. Percent of Tech Spec Limit % * * * *

B. Tritium

1. Total Release Curies 1.26E+02 3.41E+02 6.25E+02 7.26E+02 1.82E+03 18%

2. Average Diluted Concentration uCi/mL 6.53E06 1.72E05 5.67E05 5.26E05 2.84E05

3. Percent of Tech Spec Limit % * * * * *

4. Tritium from Operating as a Curies 7.54E+01 2.05E+02 3.75E+02 4.36E+02 1.09E+03 Tritium Producing Core (TPC)

5. Adjusted Tritium without TPC Curies 5.02E+01 1.36E+02 2.50E+02 2.90E+02 7.27E+02 Contribution C. Dissolved and Entrained Noble Gases

1. Total Release Curies 3.49E05 6.30E05 5.05E04 9.70E04 1.57E03 39%

2. Average Diluted Concentration uCi/mL 1.81E12 3.18E12 4.58E11 7.03E11 2.46E11

3. Percent of Tech Spec Limit % * * * *

D. Gross Alpha Radioactivity

1. Total Release Curies 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 N/A E. Volume of Liquid Waste to Liters 3.83E+08 4.47E+08 3.94E+08 5.14E+08 1.74E+09 2%

Discharge Canal (prior to dilution)

F. Volume of Dilution Water for Liters 1.92E+10 1.98E+10 1.10E+10 1.38E+10 6.39E+10 12%

Period

Applicable limits are expressed in terms of dose. See Table 4E through 4H of this report.

[27]

WBL-22-019 E29 of 77

Watts Bar Nuclear Power Plant Units 1 and 2 2021 Annual Radioactive Effluent Release Report Table 2C Liquid Effluents - Unit 1 Batch Mode Units 1st 2nd 3rd 4th Total Quarter Quarter Quarter Quarter

1. Fission and Activation Products Na24 Ci 0.00E+00 0.00E+00 0.00E+00 2.64E06 2.64E06 Cr51 Ci 0.00E+00 0.00E+00 0.00E+00 2.71E03 2.71E03 Mn54 Ci 0.00E+00 0.00E+00 0.00E+00 6.35E04 6.35E04 Mn56 Ci 0.00E+00 0.00E+00 0.00E+00 1.44E06 1.44E06 Fe59 Ci 0.00E+00 0.00E+00 0.00E+00 3.11E05 3.11E05 Co58 Ci 0.00E+00 0.00E+00 0.00E+00 2.28E02 2.28E02 Co60 Ci 0.00E+00 0.00E+00 0.00E+00 3.73E03 3.73E03 Ni63 Ci 0.00E+00 0.00E+00 0.00E+00 1.72E03 1.72E03 Zn65 Ci 0.00E+00 0.00E+00 0.00E+00 3.72E06 3.72E06 Zr95 Ci 0.00E+00 0.00E+00 0.00E+00 4.42E04 4.42E04 Zr97 Ci 0.00E+00 0.00E+00 0.00E+00 1.75E06 1.75E06 Nb95 Ci 0.00E+00 0.00E+00 0.00E+00 6.50E04 6.50E04 Nb97 Ci 0.00E+00 0.00E+00 0.00E+00 1.10E06 1.10E06 Mo99 Ci 0.00E+00 0.00E+00 0.00E+00 8.70E07 8.70E07 Ag110m Ci 0.00E+00 0.00E+00 0.00E+00 2.92E05 2.92E05 Sn117m Ci 0.00E+00 0.00E+00 0.00E+00 5.30E07 5.30E07 Sb124 Ci 0.00E+00 0.00E+00 0.00E+00 8.80E05 8.80E05 Sb125 Ci 0.00E+00 0.00E+00 0.00E+00 1.31E03 1.31E03 I135 Ci 0.00E+00 0.00E+00 0.00E+00 5.05E06 5.05E06 Total Ci 0.00E+00 0.00E+00 0.00E+00 3.24E02 3.42E02

2. Tritium H3 Ci 4.45E+02 1.21E+03 2.22E+03 2.54E+03 6.40E+03

3. Dissolved and Entrained Gases Ar41 Ci 0.00E+00 0.00E+00 0.00E+00 2.79E06 2.79E06 Kr85m Ci 0.00E+00 0.00E+00 5.45E07 0.00E+00 5.45E07 Xe131m Ci 1.76E05 0.00E+00 2.17E05 0.00E+00 3.93E05 Xe133m Ci 0.00E+00 0.00E+00 0.00E+00 1.83E05 1.83E05 Xe133 Ci 1.73E05 6.25E05 4.75E04 8.85E04 1.44E03 Xe135m Ci 0.00E+00 0.00E+00 0.00E+00 1.07E05 1.07E05 Xe135 Ci 0.00E+00 5.45E07 5.80E06 5.10E05 5.75E05 Xe138 Ci 0.00E+00 0.00E+00 1.44E06 0.00E+00 1.44E06 Total Ci 3.49E05 6.30E05 5.05E04 9.70E04 1.57E03

4. Gross Alpha Radioactivity Total For Period Ci 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00

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WBL-22-019 E30 of 77

Watts Bar Nuclear Power Plant Units 1 and 2 2021 Annual Radioactive Effluent Release Report Table 2C Liquid Effluents - Unit 1 Continuous Mode Units 1st 2nd 3rd 4th Total Quarter Quarter Quarter Quarter

1. Fission and Activation Products Total For Period Ci 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00

2. Tritium H3 Ci 6.67E01 1.11E+00 1.28E+00 3.69E+01 4.00E+01

3. Dissolved and Entrained Gases Total For Period Ci 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00

4. Gross Alpha Radioactivity Total For Period Ci 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00

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WBL-22-019 E31 of 77

Watts Bar Nuclear Power Plant Units 1 and 2 2021 Annual Radioactive Effluent Release Report Table 2D Liquid Effluents - Unit 2 Batch Mode Units 1st 2nd 3rd 4th Total Quarter Quarter Quarter Quarter

1. Fission and Activation Products Na24 Ci 0.00E+00 0.00E+00 0.00E+00 2.63E06 2.63E06 Cr51 Ci 0.00E+00 0.00E+00 0.00E+00 2.70E03 2.70E03 Mn54 Ci 0.00E+00 0.00E+00 0.00E+00 6.35E04 6.35E04 Mn56 Ci 0.00E+00 0.00E+00 0.00E+00 1.44E06 1.44E06 Co58 Ci 0.00E+00 0.00E+00 0.00E+00 2.28E02 2.28E02 Fe59 Ci 0.00E+00 0.00E+00 0.00E+00 3.11E05 3.11E05 Co60 Ci 0.00E+00 0.00E+00 0.00E+00 3.73E03 3.73E03 Ni63 Ci 0.00E+00 0.00E+00 0.00E+00 1.72E03 1.72E03 Zn65 Ci 0.00E+00 0.00E+00 0.00E+00 3.72E06 3.72E06 Zr95 Ci 0.00E+00 0.00E+00 0.00E+00 4.41E04 4.41E04 Nb95 Ci 0.00E+00 0.00E+00 0.00E+00 6.49E04 6.49E04 Zr97 Ci 0.00E+00 0.00E+00 0.00E+00 1.75E06 1.75E06 Nb97 Ci 0.00E+00 0.00E+00 0.00E+00 1.10E06 1.10E06 Mo99 Ci 0.00E+00 0.00E+00 0.00E+00 8.71E07 8.71E07 Ag110m Ci 0.00E+00 0.00E+00 0.00E+00 2.92E05 2.92E05 Sn117m Ci 0.00E+00 0.00E+00 0.00E+00 5.31E07 5.31E07 Sb124 Ci 0.00E+00 0.00E+00 0.00E+00 8.80E05 8.80E05 Sb125 Ci 0.00E+00 0.00E+00 0.00E+00 1.31E03 1.31E03 I135 Ci 0.00E+00 0.00E+00 0.00E+00 5.07E06 5.07E06 Total For Period Ci 0.00E+00 0.00E+00 0.00E+00 3.24E02 3.42E02

2. Tritium H3 Ci 1.26E+02 3.41E+02 6.25E+02 7.17E+02 1.81E+03

3. Dissolved and Entrained Gases Ar41 Ci 0.00E+00 0.00E+00 0.00E+00 2.79E06 2.79E06 Kr85m Ci 0.00E+00 0.00E+00 5.45E07 0.00E+00 5.45E07 Xe131m Ci 1.75E05 0.00E+00 2.17E05 0.00E+00 3.92E05 Xe133m Ci 0.00E+00 0.00E+00 0.00E+00 1.83E05 1.83E05 Xe133 Ci 1.73E05 6.25E05 4.75E04 8.85E04 1.44E03 Xe135m Ci 0.00E+00 0.00E+00 0.00E+00 1.07E05 1.07E05 Xe135 Ci 0.00E+00 5.45E07 5.80E06 5.10E05 5.75E05 Xe138 Ci 0.00E+00 0.00E+00 1.44E06 0.00E+00 1.44E06 Total For Period Ci 3.49E05 6.30E05 5.05E04 9.70E04 1.57E03

4. Gross Alpha Radioactivity Total For Period Ci 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00

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WBL-22-019 E32 of 77

Watts Bar Nuclear Power Plant Units 1 and 2 2021 Annual Radioactive Effluent Release Report Table 2D Liquid Effluents - Unit 2 Continuous Mode Units 1st 2nd 3rd 4th Total Quarter Quarter Quarter Quarter

1. Fission and Activation Products Total For Period Ci 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00

2. Tritium H3 Ci 1.88E01 3.12E01 3.61E01 1.04E+01 1.13E+01

3. Dissolved and Entrained Gases Total For Period Ci 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00

4. Gross Alpha Radioactivity Total For Period Ci 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00

[31]

WBL-22-019 E33 of 77

Watts Bar Nuclear Power Plant Units 1 and 2 2021 Annual Radioactive Effluent Release Report V. Solid Waste Storage and Shipment A. Types of Solid Waste - Summary 12 Month Est. (Ci)

Unit Type of Waste Period Error %

Spent resins, filters, sludges, evaporator m3 12.99E+00 N/A bottoms, etc. Ci 1.56E+02 +/ 25%

Dry Active Waste, Compressible Waste m3 6.65E+02 N/A Contaminated Equipment, etc. Ci 1.45E+00 +/ 25%

m3 0.00 N/A Irradiated Components, Control Rods, etc.

Ci 0.00 N/A B. Destination by Carrier Number of Shipments Mode of Transportation Destination 1 Motor Freight Waste Control Specialist Andrews, TX 3 Motor Freight Energy Solutions, Clive Utah 3 Motor Freight Energy Solutions, Memphis TN 2 Motor Freight Energy Solutions, Oak Ridge TN 9 Motor Freight TOXCO Oak Ridge, TN

[32]

WBL-22-019 E34 of 77

Watts Bar Nuclear Power Plant Units 1 and 2 2021 Annual Radioactive Effluent Release Report C. Major Nuclides by Waste Class and Stream (Cutoff = 1.0%)

Spent resins, filters, sludges, evaporator bottoms, etc. (nuclides determined by measurement Nuclide Percent Ci Be7 1.14% 2.75E+00 Mn54 8.71% 1.71E+01 Fe55 22.01% 4.31E+01 Co58 27.18% 5.33E+00 Co60 23.10% 4.53E+01 Ni63 13.44% 2.63E+01 Zn65 1.70% 3.33E+00 Dry Active Waste, Compressible Waste Contaminated Equipment, etc. (nuclides determined by estimate) Nuclide Percent Ci H3 47.03% 7.24E01 Mn54 2.81% 3.36E02 Fe55 7.62% 1.17E01 Co58 4.26% 6.56E02 Co60 19.30% 2.97E01 Ni63 3.59% 5.52E02 Zr95 3.49% 5.37E02 Nb95 7.30% 8.71E03 Sb125 2.73% 4.21E02 Cs137 1.44% 2.22E02 Irradiated Components None N/A N/A

[33]

WBL-22-019 E35 of 77

Watts Bar Nuclear Power Plant Units 1 and 2 2021 Annual Radioactive Effluent Release Report D. Irradiated Fuel Shipments None E. Solidification of Waste Was solidification performed? No If yes, solidification media: N/A

[34]

WBL-22-019 E36 of 77

Watts Bar Nuclear Power Plant Units 1 and 2 2021 Annual Radioactive Effluent Release Report Radiological Impact VI. Radiological Impact to Man A. Introduction Potential doses to maximum individuals and the population around WBN are calculated for each quarter as required in Section 5.2 of the ODCM. Measured plant releases for the reporting period are used to estimate these doses. Dispersion of radioactive effluents in the environment is estimated using meteorological data and river flow data. In this report, the doses resulting from releases are described and compared to limits established for WBN.

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.

C. Dose Calculations Estimated doses to the public are determined using computer models (the Gaseous Effluent Licensing Code, GELC, and the Quarterly Water Dose Assessment Code, QWATA).

These models are based on guidance provided by the NRC (in Regulatory Guides 1.109, 1.111 and 1.113) 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. Many of these factors are obtained from NUREG/CR1004. The values chosen will tend to overestimate the dose to this "maximum" person. The expected dose to actual individuals is lower. The calculated doses are presented in Tables 3 and 4.

D. Doses from Airborne Effluents For airborne effluents, 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 eaten by milk and beef animals.

Airborne Discharge Points All releases from WBN are considered groundlevel releases. The groundlevel Joint Frequency Distribution (JFD) is derived from wind speeds and directions measured 10 meters above ground and from the vertical temperature difference between 10 and 46 meters, as presented for each quarter in Section VIII.

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WBL-22-019 E37 of 77

Watts Bar Nuclear Power Plant Units 1 and 2 2021 Annual Radioactive Effluent Release Report Radiological Impact Meteorological Data Meteorological variables at WBN are measured continuously. Measurements collected include wind speed, wind direction, and temperature at heights of 10, 46, and 91 meters above the ground. Quarterly JFDs are calculated for each release point using the appropriate levels of meteorological data. A JFD provides the percentage of the time in a quarter 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 0.7 m/s (1.5 mph). Stability classes are determined from the vertical temperature difference between two measurement levels.

External Exposure Dose Dose estimates for maximum external air dose (gammaair and betaair doses) are made for points at and beyond the unrestricted area boundary as described in the WBN ODCM.

The highest of these doses is then selected.

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

Organ Dose Doses to organs 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 milk, ingestion of beef, and ingestion of vegetables. Doses from applicable pathways are calculated for each real 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. For the ingestion dose, however, only those pathways that exist for each receptor are considered in the sum, i.e., milk ingestion doses are included only for locations where milk is consumed without commercial preparation and vegetable ingestion is included only for those locations where a garden is identified. Since specific data on beef animals were not available, the location of the highest beef dose for all receptors within an age group will be considered the beef dose for each receptor within that age group. 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.

Doses from airborne effluents from Unit 1 are presented in Tables 3A through 3D. Doses from airborne effluents from Unit 2 are presented in Tables 3E through 3H.

[36]

WBL-22-019 E38 of 77

Watts Bar Nuclear Power Plant Units 1 and 2 2021 Annual Radioactive Effluent Release Report Radiological Impact 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 sediment (recreation).

The concentrations of radioactivity in the Tennessee River are estimated by a computer model which uses measured hydraulic data downstream of WBN. Parameters used to determine the doses are based on guidance given by the NRC (in Regulatory Guide 1.109) for maximum ingestion rates, exposure times, etc. Wherever possible, parameters used in the dose calculation are site specific use factors determined by TVA. The models that are used to estimate doses, as well as the parameters input to the models, are described in detail in the WBN ODCM.

Liquid Release Points and River Data Radioactivity concentrations in the Tennessee River are calculated assuming that releases in liquid effluents are continuous. All routine liquid releases from WBN, located at Tennessee River Mile 528.5, 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 tenth 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 Tennessee River Mile 510.0.

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

The maximum potential recreation dose is calculated for a location immediately downstream from the plant outfall. The maximum 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 (Chickamauga Dam). The maximum individual dose from drinking water is assumed to be that calculated at the nearest downstream public water supply (Dayton, TN).

This could be interpreted as indicating that the maximum individual, as assumed for liquid releases from WBN, is an individual who obtains all of his drinking water at Dayton, TN, consumes fish caught from the Tennessee River between WBN and Chickamauga Dam, and spends 500 hours0.00579 days 0.139 hours 8.267196e-4 weeks 1.9025e-4 months per year on the shoreline just below the outfall from WBN. Dose estimates for the maximum individual due to liquid effluents for each quarter in the period are presented in Tables 4A through 4H, along with the average river flows past the plant site for the periods.

F. Population Doses Population doses for highest exposed organ due to airborne effluents are calculated for a projected 2040 population distribution of 1,523,385 persons living within a 50mile radius of the plant site. Doses from external pathways and inhalation are based on the 50mile human population distribution. Ingestion population doses are calculated assuming that each individual consumes milk, vegetables, and meat produced within the sector annulus in which he resides. Doses from external pathways and inhalation are based on the 50mile human population distribution.

[37]

WBL-22-019 E39 of 77

Watts Bar Nuclear Power Plant Units 1 and 2 2021 Annual Radioactive Effluent Release Report Radiological Impact Population doses for total body and the maximum exposed organ 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 actual recreational data on the number of shoreline visits at downstream locations.

Population dose estimates for airborne and liquid effluents from Unit 1 are presented in Tables 3A through 3D and 4A through 4D. Population dose estimates for airborne and liquid effluents from Unit 2 are presented in Tables 3E through 3H and 4E through 4H.

G. Offsite Direct Radiation Dose External gamma radiation levels were measured by Landauer InLight (optically stimulated luminescence dosimeters (OSLDs) deployed around WBN as part of the offsite Radiological Environmental Monitoring Program. The quarterly gamma radiation levels determined from these dosimeters during this reporting period averaged 15.4 mR/quarter at onsite (at or near the site boundary) stations and 14.5 mR/quarter at offsite stations or 0.9 mR/quarter higher onsite than at offsite stations. This difference is consistent with levels measured for preoperational and construction phases of the WBN plant site where the average radiation levels onsite were generally 28 mR/quarter higher than the levels offsite. This may be attributable to natural variations in environmental radiation levels, earth moving activities onsite, the mass of concrete employed in the construction of the plants, or other undetermined influences. Fluctuations in natural background dose rates and in dosimeters readings tend to mask any small increments which may be due to plant operations. Thus, there was no identifiable increase in dose rate levels attributable to direct radiation from plant equipment and/or gaseous effluents.

H. Dose to a Member of the Public Inside the Site Boundary As stated in the WBN ODCM, an evaluation of the dose to a member of the public inside the unrestricted area boundary is performed for a hypothetical TVA employee who works just outside the restricted area boundary for an entire work year (2000 hours0.0231 days 0.556 hours 0.00331 weeks 7.61e-4 months ). Results from onsite dosimeter measurements indicated that the highest annual dosimeter reading outside Radiological Control Area was 70 mrem. Using this value, subtracting an annual background value of approximately 50 mrem/year, and multiplying by the ratio of the occupancy times (2000/8760), the highest external dose to a member of the public inside the unrestricted area boundary would be 4.6 mrem. The doses due to radioactive effluents released to the atmosphere calculated in this report would not add a significant amount to this measured dose. This dose is below the 10 CFR 20 annual limit of 100 mrem.

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

The annual dose to any organ other than thyroid for the maximum individual is conservatively estimated by summing the following doses: the total body air submersion

[38]

WBL-22-019 E40 of 77

Watts Bar Nuclear Power Plant Units 1 and 2 2021 Annual Radioactive Effluent Release Report Radiological Impact 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 environmental monitoring program. This dose is compared to the 40 CFR 190 limit for total body or any organ dose (other than thyroid) to determine compliance.

The annual thyroid dose to the maximum 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 environmental monitoring program. This dose is compared to the 40 CFR 190 limit for thyroid dose to determine compliance. Cumulative annual total doses are presented in Table 5.

[39]

WBL-22-019 E41 of 77

Watts Bar Nuclear Power Plant Units 1 and 2 2021 Annual Radioactive Effluent Release Report Radiological Impact J. Tables Table 3A Doses from Unit 1 Airborne Effluents - 1st Quarter Individual Doses Pathway Dose Quarterly Limit Percent of Limit Location Beta Air 1.98E02 mrad 1.00E+01 mrad 1.98E01 ENE 1370 meters Gamma Air 5.35E02 mrad 5.00E+00 mrad 1.07E+00 ENE 1370 meters NG Skin 2.08E02 mrad N/A N/A SE 1409 meters NG Total Body 1.41E02 mrad N/A N/A SE 1409 meters Organ Doses (Iodine, Tritium, Particulates with >8Day halflife)

(Max) Child / 4.95E01 mrem 7.5 mrem 6.54E+00 NE 3661 meters Bone Child / Thyroid 1.20E01 mrem 7.5 mrem 1.54E+00 SE 1409 meters Child / Total 1.20E01 mrem 7.5 mrem 1.54E+00 SE 1409 meters Body Population Doses Total Body Dose 3.57E01 manrem Maximum Organ Dose (Organ) 1.44E+00 manrem (Bone)

[40]

WBL-22-019 E42 of 77

Watts Bar Nuclear Power Plant Units 1 and 2 2021 Annual Radioactive Effluent Release Report Radiological Impact Table 3B Doses from Unit 1 Airborne Effluents - 2nd Quarter Individual Doses Pathway Dose Quarterly Limit Percent of Limit Location Beta Air 4.28E02 mrad 1.00E+01 mrad 4.82E01 ENE 1370 meters Gamma Air 1.57E02 mrad 5.00E+00 mrad 3.14E01 ENE 1370 meters NG Skin 1.59E02 mrad N/A N/A ENE 3072 meters NG Total Body 1.07E02 mrad N/A N/A ENE 3072 meters Organ Doses (Iodine, Tritium, Particulates with >8Day halflife)

(Max) Child / 9.07E01 mrem 7.5 mrem 12.1E+00 NE 3661 meters Bone Child / Thyroid 2.10E01 mrem 7.5 mrem 2.80E+00 NE 3661 meters Child / Total 2.10E01 mrem 7.5 mrem 2.80E+00 NE 3661 meters Body Population Doses Total Body Dose 5.55E01 manrem Maximum Organ Dose (Organ) 2.20E+00 manrem (Bone)

[41]

WBL-22-019 E43 of 77

Watts Bar Nuclear Power Plant Units 1 and 2 2021 Annual Radioactive Effluent Release Report Radiological Impact Table 3C Doses from Unit 1 Airborne Effluents - 3rd Quarter Individual Doses Pathway Dose Quarterly Limit Percent of Limit Location Beta Air 1.57E01 mrad 1.00E+01 mrad 1.57E+00 ENE 1370 meters Gamma Air 4.42E01 mrad 5.00E+00 mrad 8.84E+00 ENE 1370 meters NG Skin 1.59E01 mrad N/A N/A ENE 3072 meters NG Total Body 1.08E01 mrad N/A N/A ENE 3072 meters Organ Doses (Iodine, Tritium, Particulates with >8Day halflife)

(Max) Child / 7.68E01 mrem 7.5 mrem 1.02E+01 NE 3661 meters Bone Child / Thyroid 2.62E01 mrem 7.5 mrem 3.49E+00 SE 1409 meters Child / Total 2.62E01 mrem 7.5 mrem 3.49E+00 SE 1409 meters Body Population Doses Total Body Dose 7.36E01 manrem Maximum Organ Dose (Organ) 2.16E+00 manrem (Bone)

[42]

WBL-22-019 E44 of 77

Watts Bar Nuclear Power Plant Units 1 and 2 2021 Annual Radioactive Effluent Release Report Radiological Impact Table 3D Doses from Unit 1 Airborne Effluents - 4th Quarter Individual Doses Pathway Dose Quarterly Limit Percent of Limit Location Beta Air 1.37E02 mrad 1.00E+01 mrad 1.37E01 ESE 1250 meters Gamma Air 3.82E02 mrad 5.00E+00 mrad 7.64E01 ESE 1250 meters NG Skin 1.71E02 mrad N/A N/A SE 1409 meters NG Total Body 1.60E02 mrad N/A N/A SE 1409 meters Organ Doses (Iodine, Tritium, Particulates with >8Day halflife)

(Max) Child / 3.12E01 mrem 7.5 mrem 4.16E+00 SE 1409 meters Bone Child / Thyroid 1.24E01 mrem 7.5 mrem 1.65E+00 SE 1409 meters Child / Total 1.24E01 mrem 7.5 mrem 1.65E+00 SE 1409 meters Body Population Doses Total Body Dose 4.25E01 manrem Maximum Organ Dose (Organ) 8.64E01 manrem (Bone)

[43]

WBL-22-019 E45 of 77

Watts Bar Nuclear Power Plant Units 1 and 2 2021 Annual Radioactive Effluent Release Report Radiological Impact Table 3E Doses from Unit 2 Airborne Effluents - 1st Quarter Individual Doses Pathway Dose Quarterly Limit Percent of Limit Location Beta Air 4.20E03 mrad 1.00E+01 mrad 4.2E02 ENE 1370 meters Gamma Air 1.19E02 mrad 5.00E+00 mrad 2.38E01 ENE 1370 meters NG Skin 4.65E03 mrad N/A N/A SE 1409 meters NG Total Body 3.16E03 mrad N/A N/A SE 1409 meters Organ Doses (Iodine, Tritium, Particulates with >8Day halflife)

(Max) Child / 4.16E01 mrem 7.5 mrem 5.55E+00 NE 3661 meters Bone Child / Thyroid 8.79E02 mrem 7.5 mrem 1.17E+00 SE 1409 meters Child / Total 8.79E02 mrem 7.5 mrem 1.17E+00 SE 1409 meters Body Population Doses Total Body Dose 2.59E01 manrem Maximum Organ Dose (Organ) 1.20E+00 manrem (Bone)

[44]

WBL-22-019 E46 of 77

Watts Bar Nuclear Power Plant Units 1 and 2 2021 Annual Radioactive Effluent Release Report Radiological Impact Table 3F Doses from Unit 2 Airborne Effluents - 2nd Quarter Individual Doses Pathway Dose Quarterly Limit Percent of Limit Location Beta Air 3.96E03 mrad 1.00E+01 mrad 3.96E02 ENE 1370 meters Gamma Air 1.12E02 mrad 5.00E+00 mrad 2.24E01 ENE 1370 meters NG Skin 4.19E03 mrad N/A N/A ENE 3072 meters NG Total Body 2.86E03 mrad N/A N/A ENE 3072 meters Organ Doses (Iodine, Tritium, Particulates with >8Day halflife)

(Max) Child / 7.75E01 mrem 7.5 mrem 10.3E+00 NE 3661 meters Bone Child / Thyroid 1.63E01 mrem 7.5 mrem 2.17E+00 NE 3661 meters Child / Total 1.63E01 mrem 7.5 mrem 2.17E+00 NE 3661 meters Body Population Doses Total Body Dose 4.02E01 manrem Maximum Organ Dose (Organ) 1.85E+00 manrem (Bone)

[45]

WBL-22-019 E47 of 77

Watts Bar Nuclear Power Plant Units 1 and 2 2021 Annual Radioactive Effluent Release Report Radiological Impact Table 3G Doses from Unit 2 Airborne Effluents - 3rd Quarter Individual Doses Pathway Dose Quarterly Limit Percent of Limit Location Beta Air 2.14E02 mrad 1.00E+01 mrad 2.14E01 ENE 1370 meters Gamma Air 6.07E02 mrad 5.00E+00 mrad 1.21E+00 ENE 1370 meters NG Skin 2.17E02 mrad N/A N/A ENE 3072 meters NG Total Body 1.48E02 mrad N/A N/A ENE 3072 meters Organ Doses (Iodine, Tritium, Particulates with >8Day halflife)

(Max) Child / 4.71E01 mrem 7.5 mrem 6.28E+00 NE 3661 meters Bone Child / Thyroid 1.13E01 mrem 7.5 mrem 1.51E+00 NE 3661 meters Child / Total 1.13E01 mrem 7.5 mrem 1.51E+00 NE 3661 meters Body Population Doses Total Body Dose 3.45E01 manrem Maximum Organ Dose (Organ) 1.32E+00 manrem (Bone)

[46]

WBL-22-019 E48 of 77

Watts Bar Nuclear Power Plant Units 1 and 2 2021 Annual Radioactive Effluent Release Report Radiological Impact Table 3H Doses from Unit 2 Airborne Effluents - 4th Quarter Individual Doses Pathway Dose Quarterly Limit Percent of Limit Location Beta Air 3.68E02 mrad 1.00E+01 mrad 3.68E01 ESE 1250 meters Gamma Air 1.04E01 mrad 5.00E+00 mrad 2.08E+00 ESE 1250 meters NG Skin 4.62E02 mrad N/A N/A SE 1409 meters NG Total Body 3.14E02 mrad N/A N/A SE 1409 meters Organ Doses (Iodine, Tritium, Particulates with >8Day halflife)

(Max) Child / 8.10E01 mrem 7.5 mrem 10.8E+00 SE 1409 meters Bone Child / Thyroid 2.02E01 mrem 7.5 mrem 2.69E+00 SE 1409 meters Child / Total 2.02E01 mrem 7.5 mrem 2.69E+00 SE 1409 meters Body Population Doses Total Body Dose 4.53E01 manrem Maximum Organ Dose (Organ) 1.87E+00 manrem (Bone)

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Watts Bar Nuclear Power Plant Units 1 and 2 2021 Annual Radioactive Effluent Release Report Radiological Impact Table 4A Doses from Unit 1 Liquid Effluents - 1st Quarter Individual Doses Age Group Organ Dose Quarterly Limit Percent of Limit Child Bone 1.30E03 mrem 5.00E+00 2.60E02 Child GILLI 1.30E03 mrem 5.00E+00 2.60E02 Child Kidney 1.30E03 mrem 5.00E+00 2.60E02 Child Liver 1.30E03 mrem 5.00E+00 2.60E02 Child Lung 1.30E03 mrem 5.00E+00 2.60E02 Child Thyroid 1.30E03 mrem 5.00E+00 2.60E02 Child Total Body 1.30E03 mrem 1.50E+00 8.67E02 Average river flow past WBN (cubic feet per second): 44,582 cfs Population Doses Total Body Dose 1.10E01 manrem Maximum Organ Dose (Organ) 1.10E01 manrem (Bone, GILLI, Kidney, Liver, Lung, Thyroid)

Table 4B Doses from Unit 1 Liquid Effluents - 2nd Quarter Individual Doses Age Group Organ Dose Quarterly Limit Percent of Limit Child Bone 6.50E03 mrem 5.00E+00 1.30E01 Child GILLI 6.50E03 mrem 5.00E+00 1.30E01 Child Kidney 6.50E03 mrem 5.00E+00 1.30E01 Child Liver 6.50E03 mrem 5.00E+00 1.30E01 Child Lung 6.50E03 mrem 5.00E+00 1.30E01 Child Thyroid 6.50E03 mrem 5.00E+00 1.30E01 Child Total Body 6.50E03 mrem 1.50E+00 4.33E01 Average river flow past WBN (cubic feet per second): 23,902 cfs Population Doses Total Body Dose 5.50E01 manrem Maximum Organ Dose (Organ) 5.50E01 manrem (Bone, GILLI, Kidney, Liver, Lung, Thyroid)

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Watts Bar Nuclear Power Plant Units 1 and 2 2021 Annual Radioactive Effluent Release Report Radiological Impact Table 4C Doses from Unit 1 Liquid Effluents - 3rd Quarter Individual Doses Age Group Organ Dose Quarterly Limit Percent of Limit Child Bone 1.20E02 mrem 5.00E+00 2.40E01 Child GILLI 1.20E02 mrem 5.00E+00 2.40E01 Child Kidney 1.20E02 mrem 5.00E+00 2.40E01 Child Liver 1.20E02 mrem 5.00E+00 2.40E01 Child Lung 1.20E02 mrem 5.00E+00 2.40E01 Child Thyroid 1.20E02 mrem 5.00E+00 2.40E01 Child Total Body 1.20E02 mrem 1.50E+00 8.00E01 Average river flow past WBN (cubic feet per second): 23,826 cfs Population Doses Total Body Dose 9.70E01 manrem Maximum Organ Dose (Organ) 9.70E01 manrem (Bone, GILLI, Kidney, Liver, Lung, Thyroid)

Table 4D Doses from Unit 1 Liquid Effluents - 4th Quarter Individual Doses Age Group Organ Dose Quarterly Limit Percent of Limit Child Bone 1.30E02 mrem 5.00E+00 2.60E01 Adult GILLI 1.40E02 mrem 5.00E+00 2.80E01 Child Kidney 1.20E02 mrem 5.00E+00 2.40E01 Child Liver 1.20E02 mrem 5.00E+00 2.40E01 Child Lung 1.20E02 mrem 5.00E+00 2.40E01 Child Thyroid 1.20E02 mrem 5.00E+00 2.40E01 Child Total Body 1.20E02 mrem 1.50E+00 8.00E01 Average river flow past WBN (cubic feet per second): 27,974 cfs Population Doses Total Body Dose 1.10E+00 manrem Maximum Organ Dose (Organ) 1.10E+00 manrem (Bone, GILLI, Kidney, Liver, Lung, Thyroid)

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Watts Bar Nuclear Power Plant Units 1 and 2 2021 Annual Radioactive Effluent Release Report Radiological Impact Table 4E Doses from Unit 2 Liquid Effluents - 1st Quarter Individual Doses Age Group Organ Dose Quarterly Limit Percent of Limit Child Bone 3.60E04 mrem 5.00E+00 7.20E03 Child GILLI 3.60E04 mrem 5.00E+00 7.20E03 Child Kidney 3.60E04 mrem 5.00E+00 7.20E03 Child Liver 3.60E04 mrem 5.00E+00 7.20E03 Child Lung 3.60E04 mrem 5.00E+00 7.20E03 Child Thyroid 3.60E04 mrem 5.00E+00 7.20E03 Child Total Body 3.60E04 mrem 1.50E+00 2.40E02 Average river flow past WBN (cubic feet per second): 44,582 cfs Population Doses Total Body Dose 3.20E02 manrem Maximum Organ Dose (Organ) 3.20E02 manrem (Bone, GILLI, Kidney, Liver, Lung, Thyroid)

Table 4F Doses from Unit 2 Liquid Effluents - 2nd Quarter Individual Doses Age Group Organ Dose Quarterly Limit Percent of Limit Child Bone 1.80E03 mrem 5.00E+00 3.60E02 Child GILLI 1.80E03 mrem 5.00E+00 3.60E02 Child Kidney 1.80E03 mrem 5.00E+00 3.60E02 Child Liver 1.80E03 mrem 5.00E+00 3.60E02 Child Lung 1.80E03 mrem 5.00E+00 3.60E02 Child Thyroid 1.80E03 mrem 5.00E+00 3.60E02 Child Total Body 1.80E03 mrem 1.50E+00 1.20E01 Average river flow past WBN (cubic feet per second): 23,902 cfs Population Doses Total Body Dose 1.50E01 manrem Maximum Organ Dose (Organ) 1.50E01 manrem (Bone, GILLI, Kidney, Liver, Lung, Thyroid)

[50]

WBL-22-019 E52 of 77

Watts Bar Nuclear Power Plant Units 1 and 2 2021 Annual Radioactive Effluent Release Report Radiological Impact Table 4G Doses from Unit 2 Liquid Effluents - 3rd Quarter Individual Doses Age Group Organ Dose Quarterly Limit Percent of Limit Child Bone 3.40E03 mrem 5.00E+00 6.80E02 Child GILLI 3.40E03 mrem 5.00E+00 6.80E02 Child Kidney 3.40E03 mrem 5.00E+00 6.80E02 Child Liver 3.40E03 mrem 5.00E+00 6.80E02 Child Lung 3.40E03 mrem 5.00E+00 6.80E02 Child Thyroid 3.40E03 mrem 5.00E+00 6.80E02 Child Total Body 3.40E03 mrem 1.50E+00 2.27E01 Average river flow past WBN (cubic feet per second): 23,826 cfs Population Doses Total Body Dose 2.70E01 manrem Maximum Organ Dose (Organ) 2.70E01 manrem (Bone, GILLI, Kidney, Liver, Lung, Thyroid)

Table 4H Doses from Unit 2 Liquid Effluents - 4th Quarter Individual Doses Age Group Organ Dose Quarterly Limit Percent of Limit Child Bone 4.10E03 mrem 5.00E+00 8.20E02 Adult GILLI 6.90E03 mrem 5.00E+00 1.38E01 Child Kidney 3.93E03 mrem 5.00E+00 7.86E02 Child Liver 3.90E03 mrem 5.00E+00 7.80E02 Child Lung 3.90E03 mrem 5.00E+00 7.80E02 Child Thyroid 3.90E03 mrem 5.00E+00 7.80E02 Child Total Body 3.90E03 mrem 1.50E+00 2.60E02 Average river flow past WBN (cubic feet per second): 27,974 cfs Population Doses Total Body Dose 3.1E01 manrem Maximum Organ Dose (Organ) 3.2E01 manrem (Bone, GILLI)

[51]

WBL-22-019 E53 of 77

Watts Bar Nuclear Power Plant Units 1 and 2 2021 Annual Radioactive Effluent Release Report Radiological Impact Table 5 Total Dose from Fuel Cycle Dose First Second Third Fourth Quarter Quarter Quarter Quarter Total Body or any Organ (except thyroid)

Total body air 1.73E02 1.36E02 2.56E01 4.74E02 (submersion)

Critical organ dose 9.11E01 1.68E+00 1.24E+00 1.12E+00 (airborne)

Total body 2.60E02 1.30E02 2.40E02 3.90E03 dose (liquid)

Maximum organ dose 2.60E02 1.30E02 2.40E02 6.90E03 (liquid)

Direct Radiation 0.00E+00 0.00E+00 0.00E+00 0.00E+00 Dose Total 9.80E01 1.72E+00 1.54E+00 1.18E+00 Cumulative Total Dose (mrem) 5.42E+00 Annual Dose Limit (mrem) 2.50E+01 Percent of Limit 2.17E+01 Thyroid Total body air 1.73E02 1.36E02 2.56E01 4.74E02 (submersion)

Thyroid dose 2.08E01 3.73E01 3.75E01 3.26E01 (airborne)

Total body dose 2.60E02 1.30E02 2.40E02 3.90E03 (liquid)

Thyroid dose 2.60E02 1.30E02 2.40E02 2.40E02 (liquid)

Total 2.77E01 4.13E01 6.79E01 4.01E01 Cumulative Total Dose (mrem) 1.77E+00 Annual Dose Limit (mrem) 7.50E+01 Percent of Limit 2.36E+00

[52]

WBL-22-019 E54 of 77

Watts Bar Nuclear Power Plant Units 1 and 2 2021 Annual Radioactive Effluent Release Report VII. Independent Spent Fuel Storage Installation The Tennessee Valley Authority (TVA) selected the Holtec International Storage Module (HISTORM) Flood/Wind (FW) MultiPurpose Canister (MPC) Storage System for storage of spent fuel at the Watts Bar Nuclear (WBN) Plant Independent Spent Fuel Storage Installation (ISFSI). The HISTORM FW MPC Storage System has been reviewed and approved by the Nuclear Regulatory Commission (NRC) and Certificate of Compliance (CoC) number 1032 Title 10 CFR 72.104, Criteria for radioactive materials in effluents and direct radiation from an ISFSI or Monitored Retrievable Storage Installation (MSRI), requires that the annual dose equivalent to any real individual, located beyond the controlled area, must not exceed 25 millirem (mrem) to the whole body, 75 mrem to the thyroid, and 25 mrem to any other critical organ, as a result of exposure to direct radiation from ISFSI operations.

WBN successfully placed its first loaded HISTORM FW on the ISFSI pad on October 5, 2016. The TVA ISFSI storage pad is located within the plants protected area. The storage pad is designed to adequately support both static and dynamic loads of 80 loaded Holtec HI STORM FW MPC Storage Systems. Currently, the storage pad contains twenty canisters.

The offsite dose for normal operating conditions to a real individual beyond the controlled area boundary is limited by 10 CFR 72.104(a) to a maximum of 25 mrem/year whole body, 75 mrem/year thyroid, and 25 mrem/year for other critical organs, including contributions from all nuclear fuel cycle operations. For this report, total site releases include the WBN ISFSI as part of plant operations. By its design, there were no liquid or gaseous effluents from the operation of the ISFSI during 2021.

Radiological Environmental Monitoring Program assessment of direct radiation exposure by dosimeters at or near the site boundary is 3.5 mrem/yr for onsite locations. As stated in the WBN ODCM and per this report, the dose to a member of the public inside the unrestricted boundary is then performed. Results from onsite dosimeter measurement and subtracting background indicated that the highest dosimeter reading at the boundary of the protected area was 3 mrem for the Warehouse B O/S wall of RMA Cage location AR002.

Based on the above measurements performed during this reporting period, it can be concluded that the radiation exposure due to the ISFSI, combined with all other fuel cycle operations, will not exceed the regulatory requirements of 25 mrem/year in 10 CFR 72.104(a) and 40 CFR Part 190.

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Watts Bar Nuclear Power Plant Units 1 and 2 2021 Annual Radioactive Effluent Release Report Meteorological Data VIII. Meteorological Data

[54]

WBL-22-019 E56 of 77

Watts Bar Nuclear Power Plant Units 1 and 2 2021 Annual Radioactive Effluent Release Report Meteorological Data JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS A (DELTA T<=-1.9 C/100 M)

WATTS BAR NUCLEAR PLANT JAN 1, 2021 - MAR 31, 2021 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 0.046 0.000 0.000 0.000 0.000 0.046 NNE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 NE 0.000 0.000 0.000 0.000 0.046 0.000 0.000 0.000 0.000 0.046 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 0.000 0.000 0.000 0.000 0.000 SE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 SSE 0.000 0.000 0.000 0.046 0.000 0.000 0.000 0.000 0.000 0.046 S 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 SSW 0.000 0.000 0.046 0.000 0.000 0.278 0.000 0.000 0.000 0.325 SW 0.000 0.000 0.000 0.000 0.000 0.046 0.000 0.000 0.000 0.046 WSW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 W 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 WNW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 NW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 NNW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 SUBTOTAL 0.000 0.000 0.046 0.046 0.093 0.325 0.000 0.000 0.000 0.510 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2157 TOTAL HOURS OF STABILITY CLASS A 11 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS A 11 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2157 TOTAL HOURS CALM 0 METEOROLOGICAL FACILITY: WATTS BAR NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 9.51 AND 45.63 METERS WIND SPEED AND DIRECTION MEASURED AT 9.72 METER LEVEL DATE PRINTED: 2021/04/26 MEAN WIND SPEED = 8.20 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS

[55]

WBL-22-019 E57 of 77

Watts Bar Nuclear Power Plant Units 1 and 2 2021 Annual Radioactive Effluent Release Report Meteorological Data JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS B (-1.9< DELTA T<=-1.7 C/100 M)

WATTS BAR NUCLEAR PLANT JAN 1, 2021 - MAR 31, 2021 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 0.046 0.000 0.139 0.000 0.000 0.000 0.185 NNE 0.000 0.000 0.000 0.000 0.185 0.278 0.000 0.000 0.000 0.464 NE 0.000 0.000 0.000 0.000 0.000 0.046 0.000 0.000 0.000 0.046 ENE 0.000 0.000 0.000 0.000 0.046 0.000 0.000 0.000 0.000 0.046 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 0.000 0.000 0.000 0.000 0.000 SE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 SSE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 S 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 SSW 0.000 0.000 0.000 0.000 0.046 0.185 0.000 0.000 0.000 0.232 SW 0.000 0.000 0.000 0.000 0.046 0.093 0.000 0.000 0.000 0.139 WSW 0.000 0.000 0.000 0.000 0.000 0.046 0.000 0.000 0.000 0.046 W 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 WNW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 NW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 NNW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 SUBTOTAL 0.000 0.000 0.000 0.046 0.325 0.788 0.000 0.000 0.000 1.159 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2157 TOTAL HOURS OF STABILITY CLASS B 25 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS B 25 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2157 TOTAL HOURS CALM 0 METEOROLOGICAL FACILITY: WATTS BAR NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 9.51 AND 45.63 METERS WIND SPEED AND DIRECTION MEASURED AT 9.72 METER LEVEL DATE PRINTED: 2021/04/26 MEAN WIND SPEED = 8.34 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS

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WBL-22-019 E58 of 77

Watts Bar Nuclear Power Plant Units 1 and 2 2021 Annual Radioactive Effluent Release Report Meteorological Data JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS C (-1.7< DELTA T<=-1.5 C/100 M)

WATTS BAR NUCLEAR PLANT JAN 1, 2021 - MAR 31, 2021 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 0.278 0.093 0.046 0.000 0.000 0.000 0.417 NNE 0.000 0.000 0.000 0.185 0.417 0.232 0.000 0.000 0.000 0.834 NE 0.000 0.000 0.000 0.046 0.000 0.093 0.000 0.000 0.000 0.139 ENE 0.000 0.000 0.000 0.093 0.093 0.000 0.000 0.000 0.000 0.185 E 0.000 0.000 0.000 0.093 0.093 0.046 0.000 0.000 0.000 0.232 ESE 0.000 0.000 0.000 0.046 0.000 0.000 0.000 0.000 0.000 0.046 SE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 SSE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 S 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 SSW 0.000 0.000 0.000 0.046 0.232 0.371 0.000 0.000 0.000 0.649 SW 0.000 0.000 0.000 0.000 0.093 0.278 0.000 0.000 0.000 0.371 WSW 0.000 0.000 0.000 0.000 0.046 0.093 0.000 0.000 0.000 0.139 W 0.000 0.000 0.000 0.000 0.046 0.000 0.000 0.000 0.000 0.046 WNW 0.000 0.000 0.000 0.046 0.000 0.185 0.000 0.000 0.000 0.232 NW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 NNW 0.000 0.000 0.000 0.000 0.000 0.093 0.000 0.000 0.000 0.093 SUBTOTAL 0.000 0.000 0.000 0.834 1.113 1.437 0.000 0.000 0.000 3.384 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2157 TOTAL HOURS OF STABILITY CLASS C 73 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS C 73 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2157 TOTAL HOURS CALM 0 METEOROLOGICAL FACILITY: WATTS BAR NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 9.51 AND 45.63 METERS WIND SPEED AND DIRECTION MEASURED AT 9.72 METER LEVEL DATE PRINTED: 2021/04/26 MEAN WIND SPEED = 7.06 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS

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WBL-22-019 E59 of 77

Watts Bar Nuclear Power Plant Units 1 and 2 2021 Annual Radioactive Effluent Release Report Meteorological Data JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS D (-1.5< DELTA T<=-0.5 C/100 M)

WATTS BAR NUCLEAR PLANT JAN 1, 2021 - MAR 31, 2021 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 1.020 2.364 2.503 2.457 0.000 0.000 0.000 8.345 NNE 0.000 0.000 1.808 2.735 1.391 0.603 0.000 0.000 0.000 6.537 NE 0.000 0.000 2.133 3.338 1.113 0.046 0.000 0.000 0.000 6.630 ENE 0.000 0.046 1.484 1.159 0.278 0.185 0.000 0.000 0.000 3.153 E 0.000 0.000 0.742 0.278 0.000 0.046 0.000 0.000 0.000 1.066 ESE 0.000 0.046 0.371 0.232 0.000 0.000 0.000 0.000 0.000 0.649 SE 0.000 0.093 0.325 0.139 0.000 0.000 0.000 0.000 0.000 0.556 SSE 0.000 0.046 0.139 0.139 0.000 0.000 0.000 0.000 0.000 0.325 S 0.000 0.046 0.788 0.417 0.093 0.185 0.000 0.000 0.000 1.530 SSW 0.000 0.046 1.252 1.113 0.881 1.113 0.000 0.000 0.000 4.404 SW 0.000 0.093 1.530 1.762 0.510 0.417 0.000 0.000 0.000 4.312 WSW 0.000 0.000 0.742 0.974 0.510 0.185 0.000 0.000 0.000 2.411 W 0.000 0.046 0.417 0.371 0.974 0.371 0.000 0.000 0.000 2.179 WNW 0.000 0.093 0.464 0.371 0.742 0.603 0.000 0.000 0.000 2.272 NW 0.000 0.046 0.417 0.278 0.464 0.649 0.000 0.000 0.000 1.854 NNW 0.000 0.093 0.649 0.417 1.252 2.643 0.000 0.000 0.000 5.053 SUBTOTAL 0.000 0.695 14.279 16.087 10.709 9.504 0.000 0.000 0.000 51.275 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2157 TOTAL HOURS OF STABILITY CLASS D 1106 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS D 1106 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2157 TOTAL HOURS CALM 0 METEOROLOGICAL FACILITY: WATTS BAR NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 9.51 AND 45.63 METERS WIND SPEED AND DIRECTION MEASURED AT 9.72 METER LEVEL DATE PRINTED: 2021/04/26 MEAN WIND SPEED = 5.12 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS

[58]

WBL-22-019 E60 of 77

Watts Bar Nuclear Power Plant Units 1 and 2 2021 Annual Radioactive Effluent Release Report Meteorological Data JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS E (-0.5< DELTA T<= 1.5 C/100 M)

WATTS BAR NUCLEAR PLANT JAN 1, 2021 - MAR 31, 2021 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 0.649 0.603 0.742 0.093 0.000 0.000 0.000 2.086 NNE 0.000 0.000 0.649 0.417 0.185 0.000 0.000 0.000 0.000 1.252 NE 0.000 0.093 0.556 0.139 0.000 0.000 0.000 0.000 0.000 0.788 ENE 0.000 0.046 0.417 0.556 0.046 0.000 0.000 0.000 0.000 1.066 E 0.000 0.093 0.510 0.046 0.000 0.000 0.000 0.000 0.000 0.649 ESE 0.000 0.185 0.046 0.000 0.000 0.000 0.000 0.000 0.000 0.232 SE 0.000 0.232 0.232 0.046 0.000 0.000 0.000 0.000 0.000 0.510 SSE 0.000 0.278 0.232 0.232 0.093 0.000 0.000 0.000 0.000 0.834 S 0.000 0.325 0.649 0.093 0.046 0.000 0.000 0.000 0.000 1.113 SSW 0.000 0.139 1.391 1.066 0.464 0.371 0.000 0.000 0.000 3.431 SW 0.000 0.371 1.715 1.205 0.139 0.185 0.000 0.000 0.000 3.616 WSW 0.000 0.603 1.020 0.510 0.093 0.000 0.000 0.000 0.000 2.225 W 0.000 0.232 0.649 0.371 0.000 0.000 0.000 0.000 0.000 1.252 WNW 0.000 0.325 0.649 0.510 0.093 0.046 0.000 0.000 0.000 1.623 NW 0.000 0.371 0.742 0.139 0.000 0.000 0.000 0.000 0.000 1.252 NNW 0.000 0.000 0.185 0.278 0.417 0.232 0.000 0.000 0.000 1.113 SUBTOTAL 0.000 3.292 10.292 6.212 2.318 0.927 0.000 0.000 0.000 23.041 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2157 TOTAL HOURS OF STABILITY CLASS E 497 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS E 497 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2157 TOTAL HOURS CALM 0 METEOROLOGICAL FACILITY: WATTS BAR NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 9.51 AND 45.63 METERS WIND SPEED AND DIRECTION MEASURED AT 9.72 METER LEVEL DATE PRINTED: 2021/04/26 MEAN WIND SPEED = 3.38 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS

[59]

WBL-22-019 E61 of 77

Watts Bar Nuclear Power Plant Units 1 and 2 2021 Annual Radioactive Effluent Release Report Meteorological Data JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS F ( 1.5< DELTA T<= 4.0 C/100 M)

WATTS BAR NUCLEAR PLANT JAN 1, 2021 - MAR 31, 2021 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 0.046 0.093 0.000 0.000 0.000 0.000 0.000 0.000 0.139 NNE 0.000 0.046 0.185 0.000 0.000 0.000 0.000 0.000 0.000 0.232 NE 0.000 0.046 0.046 0.000 0.000 0.000 0.000 0.000 0.000 0.093 ENE 0.000 0.000 0.139 0.000 0.000 0.000 0.000 0.000 0.000 0.139 E 0.000 0.000 0.093 0.000 0.000 0.000 0.000 0.000 0.000 0.093 ESE 0.000 0.093 0.046 0.000 0.000 0.000 0.000 0.000 0.000 0.139 SE 0.000 0.046 0.093 0.000 0.000 0.000 0.000 0.000 0.000 0.139 SSE 0.000 0.093 0.046 0.000 0.000 0.000 0.000 0.000 0.000 0.139 S 0.000 0.046 0.325 0.000 0.000 0.000 0.000 0.000 0.000 0.371 SSW 0.000 0.185 0.649 0.139 0.000 0.000 0.000 0.000 0.000 0.974 SW 0.000 0.556 0.649 0.046 0.000 0.000 0.000 0.000 0.000 1.252 WSW 0.000 0.742 0.927 0.046 0.000 0.000 0.000 0.000 0.000 1.715 W 0.000 1.437 0.510 0.000 0.000 0.000 0.000 0.000 0.000 1.947 WNW 0.000 0.695 0.185 0.000 0.000 0.000 0.000 0.000 0.000 0.881 NW 0.000 0.417 0.185 0.000 0.000 0.000 0.000 0.000 0.000 0.603 NNW 0.000 0.046 0.185 0.046 0.000 0.000 0.000 0.000 0.000 0.278 SUBTOTAL 0.000 4.497 4.358 0.278 0.000 0.000 0.000 0.000 0.000 9.133 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2157 TOTAL HOURS OF STABILITY CLASS F 197 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS F 197 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2157 TOTAL HOURS CALM 0 METEOROLOGICAL FACILITY: WATTS BAR NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 9.51 AND 45.63 METERS WIND SPEED AND DIRECTION MEASURED AT 9.72 METER LEVEL DATE PRINTED: 2021/04/26 MEAN WIND SPEED = 1.67 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS

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WBL-22-019 E62 of 77

Watts Bar Nuclear Power Plant Units 1 and 2 2021 Annual Radioactive Effluent Release Report Meteorological Data JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS G (DELTA T > 4.0 C/100 M)

WATTS BAR NUCLEAR PLANT JAN 1, 2021 - MAR 31, 2021 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 0.001 0.046 0.046 0.000 0.000 0.000 0.000 0.000 0.000 0.094 NNE 0.002 0.185 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.188 NE 0.002 0.093 0.093 0.000 0.000 0.000 0.000 0.000 0.000 0.188 ENE 0.003 0.046 0.232 0.000 0.000 0.000 0.000 0.000 0.000 0.282 E 0.001 0.046 0.046 0.000 0.000 0.000 0.000 0.000 0.000 0.094 ESE 0.001 0.093 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.094 SE 0.001 0.046 0.046 0.000 0.000 0.000 0.000 0.000 0.000 0.094 SSE 0.003 0.232 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.235 S 0.004 0.232 0.093 0.000 0.000 0.000 0.000 0.000 0.000 0.328 SSW 0.007 0.464 0.139 0.000 0.000 0.000 0.000 0.000 0.000 0.610 SW 0.022 1.576 0.185 0.000 0.000 0.000 0.000 0.000 0.000 1.783 WSW 0.036 2.179 0.742 0.000 0.000 0.000 0.000 0.000 0.000 2.956 W 0.031 1.994 0.556 0.000 0.000 0.000 0.000 0.000 0.000 2.581 WNW 0.014 0.927 0.232 0.000 0.000 0.000 0.000 0.000 0.000 1.173 NW 0.007 0.325 0.278 0.000 0.000 0.000 0.000 0.000 0.000 0.610 NNW 0.002 0.139 0.046 0.000 0.000 0.000 0.000 0.000 0.000 0.188 SUBTOTAL 0.139 8.623 2.735 0.000 0.000 0.000 0.000 0.000 0.000 11.497 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2157 TOTAL HOURS OF STABILITY CLASS G 248 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS G 248 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2157 TOTAL HOURS CALM 3 METEOROLOGICAL FACILITY: WATTS BAR NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 9.51 AND 45.63 METERS WIND SPEED AND DIRECTION MEASURED AT 9.72 METER LEVEL DATE PRINTED: 2021/04/26 MEAN WIND SPEED = 1.22 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS

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WBL-22-019 E63 of 77

Watts Bar Nuclear Power Plant Units 1 and 2 2021 Annual Radioactive Effluent Release Report Meteorological Data JJOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS A (DELTA T<=-1.9 C/100 M)

WATTS BAR NUCLEAR PLANT APR 1, 2021 - JUN 30, 2021 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 0.092 0.184 0.230 0.000 0.000 0.000 0.506 NNE 0.000 0.000 0.000 0.138 0.138 0.276 0.000 0.000 0.000 0.551 NE 0.000 0.000 0.046 0.046 0.046 0.000 0.000 0.000 0.000 0.138 ENE 0.000 0.000 0.000 0.092 0.000 0.092 0.000 0.000 0.000 0.184 E 0.000 0.000 0.000 0.000 0.000 0.046 0.000 0.000 0.000 0.046 ESE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 SE 0.000 0.000 0.000 0.000 0.092 0.000 0.000 0.000 0.000 0.092 SSE 0.000 0.000 0.000 0.000 0.092 0.000 0.000 0.000 0.000 0.092 S 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 SSW 0.000 0.000 0.000 0.000 0.138 0.276 0.000 0.000 0.000 0.414 SW 0.000 0.000 0.000 0.000 0.000 0.092 0.000 0.000 0.000 0.092 WSW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 W 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 WNW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 NW 0.000 0.000 0.000 0.000 0.000 0.046 0.000 0.000 0.000 0.046 NNW 0.000 0.000 0.000 0.092 0.046 0.138 0.000 0.000 0.000 0.276 SUBTOTAL 0.000 0.000 0.046 0.460 0.735 1.195 0.000 0.000 0.000 2.436 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2176 TOTAL HOURS OF STABILITY CLASS A 53 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS A 53 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2176 TOTAL HOURS CALM 0 METEOROLOGICAL FACILITY: WATTS BAR NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 9.51 AND 45.63 METERS WIND SPEED AND DIRECTION MEASURED AT 9.72 METER LEVEL DATE PRINTED: 2021/07/23 MEAN WIND SPEED = 7.70 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS

[62]

WBL-22-019 E64 of 77

Watts Bar Nuclear Power Plant Units 1 and 2 2021 Annual Radioactive Effluent Release Report Meteorological Data JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS B (-1.9< DELTA T<=-1.7 C/100 M)

WATTS BAR NUCLEAR PLANT APR 1, 2021 - JUN 30, 2021 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 0.046 0.230 0.414 0.230 0.000 0.000 0.000 0.919 NNE 0.000 0.000 0.092 0.322 0.230 0.092 0.000 0.000 0.000 0.735 NE 0.000 0.000 0.000 0.138 0.000 0.092 0.000 0.000 0.000 0.230 ENE 0.000 0.000 0.138 0.046 0.000 0.000 0.000 0.000 0.000 0.184 E 0.000 0.000 0.000 0.046 0.000 0.000 0.000 0.000 0.000 0.046 ESE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 SE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 SSE 0.000 0.000 0.000 0.046 0.092 0.000 0.000 0.000 0.000 0.138 S 0.000 0.000 0.000 0.138 0.000 0.000 0.000 0.000 0.000 0.138 SSW 0.000 0.000 0.000 0.414 0.368 0.414 0.000 0.000 0.000 1.195 SW 0.000 0.000 0.000 0.322 0.184 0.184 0.000 0.000 0.000 0.689 WSW 0.000 0.000 0.046 0.000 0.000 0.000 0.000 0.000 0.000 0.046 W 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 WNW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 NW 0.000 0.000 0.046 0.046 0.000 0.000 0.000 0.000 0.000 0.092 NNW 0.000 0.000 0.092 0.092 0.046 0.184 0.000 0.000 0.000 0.414 SUBTOTAL 0.000 0.000 0.460 1.838 1.333 1.195 0.000 0.000 0.000 4.825 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2176 TOTAL HOURS OF STABILITY CLASS B 105 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS B 105 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2176 TOTAL HOURS CALM 0 METEOROLOGICAL FACILITY: WATTS BAR NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 9.51 AND 45.63 METERS WIND SPEED AND DIRECTION MEASURED AT 9.72 METER LEVEL DATE PRINTED: 2021/07/23 MEAN WIND SPEED = 6.07 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS

[63]

WBL-22-019 E65 of 77

Watts Bar Nuclear Power Plant Units 1 and 2 2021 Annual Radioactive Effluent Release Report Meteorological Data JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS C (-1.7< DELTA T<=-1.5 C/100 M)

WATTS BAR NUCLEAR PLANT APR 1, 2021 - JUN 30, 2021 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 0.092 0.368 0.184 0.368 0.000 0.000 0.000 1.011 NNE 0.000 0.000 0.046 0.230 0.046 0.138 0.000 0.000 0.000 0.460 NE 0.000 0.000 0.000 0.184 0.000 0.000 0.000 0.000 0.000 0.184 ENE 0.000 0.000 0.046 0.092 0.000 0.000 0.000 0.000 0.000 0.138 E 0.000 0.000 0.000 0.138 0.000 0.000 0.000 0.000 0.000 0.138 ESE 0.000 0.000 0.138 0.046 0.000 0.000 0.000 0.000 0.000 0.184 SE 0.000 0.000 0.046 0.046 0.046 0.000 0.000 0.000 0.000 0.138 SSE 0.000 0.000 0.000 0.046 0.000 0.000 0.000 0.000 0.000 0.046 S 0.000 0.000 0.046 0.368 0.230 0.000 0.000 0.000 0.000 0.643 SSW 0.000 0.000 0.046 0.506 0.322 0.230 0.000 0.000 0.000 1.103 SW 0.000 0.000 0.000 0.506 0.276 0.138 0.000 0.000 0.000 0.919 WSW 0.000 0.000 0.000 0.138 0.000 0.000 0.000 0.000 0.000 0.138 W 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 WNW 0.000 0.000 0.046 0.000 0.000 0.000 0.000 0.000 0.000 0.046 NW 0.000 0.000 0.092 0.000 0.000 0.184 0.000 0.000 0.000 0.276 NNW 0.000 0.000 0.000 0.046 0.092 0.092 0.046 0.000 0.000 0.276 SUBTOTAL 0.000 0.000 0.597 2.711 1.195 1.149 0.046 0.000 0.000 5.699 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2176 TOTAL HOURS OF STABILITY CLASS C 124 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS C 124 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2176 TOTAL HOURS CALM 0 METEOROLOGICAL FACILITY: WATTS BAR NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 9.51 AND 45.63 METERS WIND SPEED AND DIRECTION MEASURED AT 9.72 METER LEVEL DATE PRINTED: 2021/07/23 MEAN WIND SPEED = 5.74 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS

[64]

WBL-22-019 E66 of 77

Watts Bar Nuclear Power Plant Units 1 and 2 2021 Annual Radioactive Effluent Release Report Meteorological Data JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS D (-1.5< DELTA T<=-0.5 C/100 M)

WATTS BAR NUCLEAR PLANT APR 1, 2021 - JUN 30, 2021 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 0.460 1.425 1.379 1.149 0.000 0.000 0.000 4.412 NNE 0.000 0.000 1.011 0.873 0.322 0.138 0.000 0.000 0.000 2.344 NE 0.000 0.000 0.230 0.460 0.138 0.000 0.000 0.000 0.000 0.827 ENE 0.000 0.000 0.597 0.322 0.184 0.046 0.000 0.000 0.000 1.149 E 0.000 0.092 0.460 0.276 0.046 0.000 0.000 0.000 0.000 0.873 ESE 0.000 0.092 0.184 0.276 0.092 0.000 0.000 0.000 0.000 0.643 SE 0.000 0.230 0.322 0.368 0.000 0.000 0.000 0.000 0.000 0.919 SSE 0.000 0.322 0.460 0.551 0.092 0.046 0.000 0.000 0.000 1.471 S 0.000 0.276 1.241 1.241 0.368 0.138 0.000 0.000 0.000 3.263 SSW 0.000 0.046 2.206 3.263 1.792 0.873 0.046 0.000 0.000 8.226 SW 0.000 0.092 1.471 1.884 0.460 0.276 0.000 0.000 0.000 4.182 WSW 0.000 0.092 0.414 0.184 0.138 0.092 0.000 0.000 0.000 0.919 W 0.000 0.000 0.184 0.138 0.046 0.000 0.000 0.000 0.000 0.368 WNW 0.000 0.092 0.230 0.276 0.322 0.184 0.000 0.000 0.000 1.103 NW 0.000 0.092 0.138 0.184 0.506 0.689 0.000 0.000 0.000 1.608 NNW 0.000 0.046 0.322 0.689 0.368 1.195 0.000 0.000 0.000 2.619 SUBTOTAL 0.000 1.471 9.926 12.408 6.250 4.825 0.046 0.000 0.000 34.926 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2176 TOTAL HOURS OF STABILITY CLASS D 760 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS D 760 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2176 TOTAL HOURS CALM 0 METEOROLOGICAL FACILITY: WATTS BAR NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 9.51 AND 45.63 METERS WIND SPEED AND DIRECTION MEASURED AT 9.72 METER LEVEL DATE PRINTED: 2021/07/23 MEAN WIND SPEED = 4.72 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS

[65]

WBL-22-019 E67 of 77

Watts Bar Nuclear Power Plant Units 1 and 2 2021 Annual Radioactive Effluent Release Report Meteorological Data JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS E (-0.5< DELTA T<= 1.5 C/100 M)

WATTS BAR NUCLEAR PLANT APR 1, 2021 - JUN 30, 2021 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 0.046 0.551 0.322 0.368 0.230 0.000 0.000 0.000 1.517 NNE 0.000 0.046 0.322 0.092 0.000 0.000 0.000 0.000 0.000 0.460 NE 0.000 0.046 0.368 0.046 0.000 0.000 0.000 0.000 0.000 0.460 ENE 0.000 0.092 0.506 0.092 0.046 0.046 0.000 0.000 0.000 0.781 E 0.000 0.092 0.230 0.184 0.000 0.000 0.000 0.000 0.000 0.506 ESE 0.000 0.092 0.092 0.000 0.000 0.000 0.000 0.000 0.000 0.184 SE 0.000 0.046 0.092 0.000 0.000 0.000 0.000 0.000 0.000 0.138 SSE 0.000 0.322 0.230 0.138 0.046 0.000 0.000 0.000 0.000 0.735 S 0.000 0.689 1.057 0.276 0.046 0.000 0.000 0.000 0.000 2.068 SSW 0.000 0.689 2.160 0.873 0.368 0.184 0.000 0.000 0.000 4.274 SW 0.000 0.506 2.022 0.460 0.000 0.000 0.000 0.000 0.000 2.987 WSW 0.000 0.322 1.149 0.046 0.046 0.000 0.000 0.000 0.000 1.563 W 0.000 0.460 0.597 0.230 0.092 0.000 0.000 0.000 0.000 1.379 WNW 0.000 0.230 0.230 0.276 0.000 0.000 0.000 0.000 0.000 0.735 NW 0.000 0.138 0.551 0.322 0.046 0.046 0.000 0.000 0.000 1.103 NNW 0.000 0.046 0.506 0.460 0.322 0.138 0.000 0.000 0.000 1.471 SUBTOTAL 0.000 3.860 10.662 3.814 1.379 0.643 0.000 0.000 0.000 20.358 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2176 TOTAL HOURS OF STABILITY CLASS E 443 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS E 443 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2176 TOTAL HOURS CALM 0 METEOROLOGICAL FACILITY: WATTS BAR NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 9.51 AND 45.63 METERS WIND SPEED AND DIRECTION MEASURED AT 9.72 METER LEVEL DATE PRINTED: 2021/07/23 MEAN WIND SPEED = 2.93 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS

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WBL-22-019 E68 of 77

Watts Bar Nuclear Power Plant Units 1 and 2 2021 Annual Radioactive Effluent Release Report Meteorological Data JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS F ( 1.5< DELTA T<= 4.0 C/100 M)

WATTS BAR NUCLEAR PLANT APR 1, 2021 - JUN 30, 2021 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 0.001 0.000 0.230 0.000 0.000 0.000 0.000 0.000 0.000 0.231 NNE 0.000 0.000 0.000 0.046 0.000 0.000 0.000 0.000 0.000 0.046 NE 0.000 0.000 0.046 0.000 0.000 0.000 0.000 0.000 0.000 0.046 ENE 0.001 0.092 0.092 0.000 0.000 0.000 0.000 0.000 0.000 0.184 E 0.001 0.138 0.276 0.046 0.000 0.000 0.000 0.000 0.000 0.461 ESE 0.001 0.184 0.092 0.000 0.000 0.000 0.000 0.000 0.000 0.277 SE 0.001 0.138 0.046 0.046 0.000 0.000 0.000 0.000 0.000 0.230 SSE 0.001 0.138 0.138 0.000 0.000 0.000 0.000 0.000 0.000 0.277 S 0.002 0.322 0.276 0.000 0.000 0.000 0.000 0.000 0.000 0.599 SSW 0.004 0.551 0.735 0.046 0.000 0.046 0.000 0.000 0.000 1.383 SW 0.010 1.517 1.471 0.000 0.000 0.000 0.000 0.000 0.000 2.997 WSW 0.009 1.746 0.873 0.046 0.000 0.000 0.000 0.000 0.000 2.674 W 0.009 1.884 1.011 0.000 0.000 0.000 0.000 0.000 0.000 2.905 WNW 0.004 0.597 0.643 0.046 0.000 0.000 0.000 0.000 0.000 1.291 NW 0.002 0.414 0.230 0.000 0.000 0.000 0.000 0.000 0.000 0.645 NNW 0.001 0.138 0.138 0.138 0.000 0.000 0.000 0.000 0.000 0.414 SUBTOTAL 0.046 7.858 6.296 0.414 0.000 0.046 0.000 0.000 0.000 14.660 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2176 TOTAL HOURS OF STABILITY CLASS F 319 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS F 319 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2176 TOTAL HOURS CALM 1 METEOROLOGICAL FACILITY: WATTS BAR NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 9.51 AND 45.63 METERS WIND SPEED AND DIRECTION MEASURED AT 9.72 METER LEVEL DATE PRINTED: 2021/07/23 MEAN WIND SPEED = 1.58 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS

[67]

WBL-22-019 E69 of 77

Watts Bar Nuclear Power Plant Units 1 and 2 2021 Annual Radioactive Effluent Release Report Meteorological Data JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS G (DELTA T > 4.0 C/100 M)

WATTS BAR NUCLEAR PLANT APR 1, 2021 - JUN 30, 2021 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 0.000 0.000 0.000 0.000 NNE 0.000 0.046 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.046 NE 0.000 0.092 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.092 ENE 0.000 0.046 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.046 E 0.000 0.046 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.046 ESE 0.000 0.000 0.046 0.000 0.000 0.000 0.000 0.000 0.000 0.046 SE 0.000 0.046 0.046 0.000 0.000 0.000 0.000 0.000 0.000 0.092 SSE 0.000 0.046 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.046 S 0.001 0.230 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.230 SSW 0.002 0.781 0.092 0.000 0.000 0.000 0.000 0.000 0.000 0.876 SW 0.010 3.355 0.414 0.000 0.000 0.000 0.000 0.000 0.000 3.779 WSW 0.016 5.101 0.827 0.000 0.000 0.000 0.000 0.000 0.000 5.944 W 0.009 3.079 0.414 0.000 0.000 0.000 0.000 0.000 0.000 3.502 WNW 0.004 1.057 0.460 0.000 0.000 0.000 0.000 0.000 0.000 1.521 NW 0.002 0.276 0.414 0.000 0.000 0.000 0.000 0.000 0.000 0.691 NNW 0.000 0.138 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.138 SUBTOTAL 0.046 14.338 2.711 0.000 0.000 0.000 0.000 0.000 0.000 17.096 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2176 TOTAL HOURS OF STABILITY CLASS G 372 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS G 372 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2176 TOTAL HOURS CALM 1 METEOROLOGICAL FACILITY: WATTS BAR NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 9.51 AND 45.63 METERS WIND SPEED AND DIRECTION MEASURED AT 9.72 METER LEVEL DATE PRINTED: 2021/07/23 MEAN WIND SPEED = 1.20 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS

[68]

WBL-22-019 E70 of 77

Watts Bar Nuclear Power Plant Units 1 and 2 2021 Annual Radioactive Effluent Release Report Meteorological Data JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS A (DELTA T<=-1.9 C/100 M)

WATTS BAR NUCLEAR PLANT OCT 1, 2021 - DEC 31, 2021 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 0.045 0.000 0.000 0.000 0.045 NNE 0.000 0.000 0.045 0.045 0.182 0.000 0.000 0.000 0.000 0.272 NE 0.000 0.000 0.000 0.000 0.045 0.000 0.000 0.000 0.000 0.045 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 0.000 0.000 0.000 0.000 0.000 SE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 SSE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 S 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 SSW 0.000 0.000 0.045 0.000 0.182 0.227 0.000 0.000 0.000 0.454 SW 0.000 0.000 0.000 0.000 0.000 0.136 0.000 0.000 0.000 0.136 WSW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 W 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 WNW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 NW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 NNW 0.000 0.000 0.000 0.000 0.000 0.091 0.000 0.000 0.000 0.091 SUBTOTAL 0.000 0.000 0.091 0.045 0.409 0.500 0.000 0.000 0.000 1.045 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2202 TOTAL HOURS OF STABILITY CLASS A 23 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS A 23 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2202 TOTAL HOURS CALM 0 METEOROLOGICAL FACILITY: WATTS BAR NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 9.51 AND 45.63 METERS WIND SPEED AND DIRECTION MEASURED AT 9.72 METER LEVEL DATE PRINTED: 2022/01/14 MEAN WIND SPEED = 7.28 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS

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WBL-22-019 E71 of 77

Watts Bar Nuclear Power Plant Units 1 and 2 2021 Annual Radioactive Effluent Release Report Meteorological Data JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS B (-1.9< DELTA T<=-1.7 C/100 M)

WATTS BAR NUCLEAR PLANT OCT 1, 2021 - DEC 31, 2021 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 0.091 0.182 0.000 0.000 0.000 0.000 0.272 NNE 0.000 0.000 0.000 0.182 0.091 0.091 0.000 0.000 0.000 0.363 NE 0.000 0.000 0.000 0.000 0.091 0.000 0.000 0.000 0.000 0.091 ENE 0.000 0.000 0.045 0.045 0.091 0.000 0.000 0.000 0.000 0.182 E 0.000 0.000 0.045 0.000 0.000 0.000 0.000 0.000 0.000 0.045 ESE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 SE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 SSE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 S 0.000 0.000 0.000 0.045 0.045 0.045 0.000 0.000 0.000 0.136 SSW 0.000 0.000 0.000 0.182 0.545 0.227 0.000 0.000 0.000 0.954 SW 0.000 0.000 0.000 0.000 0.136 0.045 0.000 0.000 0.000 0.182 WSW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 W 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 WNW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 NW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 NNW 0.000 0.000 0.045 0.000 0.045 0.091 0.000 0.000 0.000 0.182 SUBTOTAL 0.000 0.000 0.136 0.545 1.226 0.500 0.000 0.000 0.000 2.407 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2202 TOTAL HOURS OF STABILITY CLASS B 53 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS B 53 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2202 TOTAL HOURS CALM 0 METEOROLOGICAL FACILITY: WATTS BAR NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 9.51 AND 45.63 METERS WIND SPEED AND DIRECTION MEASURED AT 9.72 METER LEVEL DATE PRINTED: 2022/01/14 MEAN WIND SPEED = 6.38 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS

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WBL-22-019 E72 of 77

Watts Bar Nuclear Power Plant Units 1 and 2 2021 Annual Radioactive Effluent Release Report Meteorological Data JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS C (-1.7< DELTA T<=-1.5 C/100 M)

WATTS BAR NUCLEAR PLANT OCT 1, 2021 - DEC 31, 2021 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 0.091 0.136 0.182 0.091 0.000 0.000 0.000 0.500 NNE 0.000 0.000 0.000 0.136 0.182 0.136 0.000 0.000 0.000 0.454 NE 0.000 0.000 0.045 0.091 0.045 0.000 0.000 0.000 0.000 0.182 ENE 0.000 0.000 0.000 0.136 0.000 0.000 0.000 0.000 0.000 0.136 E 0.000 0.000 0.091 0.091 0.000 0.000 0.000 0.000 0.000 0.182 ESE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 SE 0.000 0.000 0.045 0.000 0.000 0.000 0.000 0.000 0.000 0.045 SSE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 S 0.000 0.000 0.000 0.091 0.045 0.000 0.000 0.000 0.000 0.136 SSW 0.000 0.000 0.136 0.636 0.091 0.182 0.000 0.000 0.000 1.045 SW 0.000 0.000 0.045 0.363 0.045 0.045 0.000 0.000 0.000 0.500 WSW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 W 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 WNW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 NW 0.000 0.000 0.000 0.045 0.000 0.000 0.000 0.000 0.000 0.045 NNW 0.000 0.000 0.000 0.000 0.182 0.136 0.000 0.000 0.000 0.318 SUBTOTAL 0.000 0.000 0.454 1.726 0.772 0.590 0.000 0.000 0.000 3.542 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2202 TOTAL HOURS OF STABILITY CLASS C 78 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS C 78 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2202 TOTAL HOURS CALM 0 METEOROLOGICAL FACILITY: WATTS BAR NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 9.51 AND 45.63 METERS WIND SPEED AND DIRECTION MEASURED AT 9.72 METER LEVEL DATE PRINTED: 2022/01/14 MEAN WIND SPEED = 5.36 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS

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WBL-22-019 E73 of 77

Watts Bar Nuclear Power Plant Units 1 and 2 2021 Annual Radioactive Effluent Release Report Meteorological Data JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS D (-1.5< DELTA T<=-0.5 C/100 M)

WATTS BAR NUCLEAR PLANT OCT 1, 2021 - DEC 31, 2021 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 0.636 0.545 1.272 1.453 0.000 0.000 0.000 3.906 NNE 0.000 0.000 0.863 0.817 0.363 0.091 0.000 0.000 0.000 2.134 NE 0.000 0.091 0.454 0.999 0.363 0.000 0.000 0.000 0.000 1.907 ENE 0.000 0.091 0.863 0.999 0.182 0.000 0.000 0.000 0.000 2.134 E 0.000 0.045 0.727 0.136 0.000 0.000 0.000 0.000 0.000 0.908 ESE 0.000 0.000 0.545 0.091 0.000 0.000 0.000 0.000 0.000 0.636 SE 0.000 0.045 0.409 0.045 0.045 0.000 0.000 0.000 0.000 0.545 SSE 0.000 0.091 0.590 0.136 0.000 0.000 0.000 0.000 0.000 0.817 S 0.000 0.091 0.772 0.772 0.318 0.182 0.000 0.000 0.000 2.134 SSW 0.000 0.091 1.953 3.224 1.544 1.045 0.000 0.000 0.000 7.856 SW 0.000 0.182 1.045 1.544 0.136 0.045 0.000 0.000 0.000 2.952 WSW 0.000 0.227 1.090 0.227 0.000 0.000 0.000 0.000 0.000 1.544 W 0.000 0.000 0.272 0.045 0.045 0.000 0.000 0.000 0.000 0.363 WNW 0.000 0.091 0.590 0.182 0.182 0.000 0.000 0.000 0.000 1.045 NW 0.000 0.000 0.454 0.363 0.454 0.272 0.045 0.000 0.000 1.589 NNW 0.000 0.000 0.454 0.182 0.636 1.090 0.000 0.000 0.000 2.361 SUBTOTAL 0.000 1.045 11.717 10.309 5.540 4.178 0.045 0.000 0.000 32.834 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2202 TOTAL HOURS OF STABILITY CLASS D 723 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS D 723 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2202 TOTAL HOURS CALM 0 METEOROLOGICAL FACILITY: WATTS BAR NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 9.51 AND 45.63 METERS WIND SPEED AND DIRECTION MEASURED AT 9.72 METER LEVEL DATE PRINTED: 2022/01/14 MEAN WIND SPEED = 4.52 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS

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WBL-22-019 E74 of 77

Watts Bar Nuclear Power Plant Units 1 and 2 2021 Annual Radioactive Effluent Release Report Meteorological Data JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS E (-0.5< DELTA T<= 1.5 C/100 M)

WATTS BAR NUCLEAR PLANT OCT 1, 2021 - DEC 31, 2021 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 0.045 0.500 0.363 0.227 0.136 0.000 0.000 0.000 1.272 NNE 0.000 0.045 0.500 0.272 0.000 0.000 0.000 0.000 0.000 0.817 NE 0.000 0.136 0.817 0.272 0.000 0.000 0.000 0.000 0.000 1.226 ENE 0.000 0.136 0.500 0.409 0.000 0.000 0.000 0.000 0.000 1.045 E 0.000 0.045 0.363 0.045 0.000 0.000 0.000 0.000 0.000 0.454 ESE 0.000 0.091 0.091 0.045 0.000 0.000 0.000 0.000 0.000 0.227 SE 0.000 0.136 0.091 0.045 0.000 0.000 0.000 0.000 0.000 0.272 SSE 0.000 0.409 0.590 0.000 0.000 0.000 0.000 0.000 0.000 0.999 S 0.000 0.363 1.090 0.272 0.045 0.000 0.000 0.000 0.000 1.771 SSW 0.000 0.500 2.271 1.726 1.272 0.727 0.000 0.000 0.000 6.494 SW 0.000 0.863 1.817 0.409 0.182 0.000 0.000 0.000 0.000 3.270 WSW 0.000 1.090 1.408 0.136 0.045 0.000 0.000 0.000 0.000 2.679 W 0.000 0.817 1.045 0.227 0.000 0.000 0.000 0.000 0.000 2.089 WNW 0.000 0.817 0.681 0.318 0.045 0.045 0.000 0.000 0.000 1.907 NW 0.000 0.636 0.363 0.363 0.091 0.045 0.000 0.000 0.000 1.499 NNW 0.000 0.227 0.545 0.363 0.681 0.136 0.000 0.000 0.000 1.953 SUBTOTAL 0.000 6.358 12.670 5.268 2.589 1.090 0.000 0.000 0.000 27.975 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2202 TOTAL HOURS OF STABILITY CLASS E 616 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS E 616 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2202 TOTAL HOURS CALM 0 METEOROLOGICAL FACILITY: WATTS BAR NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 9.51 AND 45.63 METERS WIND SPEED AND DIRECTION MEASURED AT 9.72 METER LEVEL DATE PRINTED: 2022/01/14 MEAN WIND SPEED = 3.00 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS

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WBL-22-019 E75 of 77

Watts Bar Nuclear Power Plant Units 1 and 2 2021 Annual Radioactive Effluent Release Report Meteorological Data JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS F ( 1.5< DELTA T<= 4.0 C/100 M)

WATTS BAR NUCLEAR PLANT OCT 1, 2021 - DEC 31, 2021 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 0.136 0.136 0.000 0.000 0.000 0.000 0.000 0.000 0.274 NNE 0.001 0.045 0.091 0.000 0.000 0.000 0.000 0.000 0.000 0.137 NE 0.001 0.091 0.091 0.000 0.000 0.000 0.000 0.000 0.000 0.183 ENE 0.002 0.045 0.363 0.045 0.000 0.000 0.000 0.000 0.000 0.457 E 0.001 0.000 0.091 0.000 0.000 0.000 0.000 0.000 0.000 0.091 ESE 0.001 0.091 0.045 0.000 0.000 0.000 0.000 0.000 0.000 0.137 SE 0.001 0.000 0.091 0.000 0.000 0.000 0.000 0.000 0.000 0.091 SSE 0.001 0.045 0.091 0.000 0.000 0.000 0.000 0.000 0.000 0.137 S 0.003 0.227 0.272 0.000 0.000 0.000 0.000 0.000 0.000 0.502 SSW 0.010 0.500 1.181 0.091 0.000 0.000 0.000 0.000 0.000 1.781 SW 0.009 0.863 0.636 0.045 0.000 0.000 0.000 0.000 0.000 1.553 WSW 0.014 1.680 0.636 0.000 0.000 0.000 0.000 0.000 0.000 2.330 W 0.017 2.225 0.590 0.000 0.000 0.000 0.000 0.000 0.000 2.832 WNW 0.018 2.634 0.500 0.000 0.000 0.000 0.000 0.000 0.000 3.152 NW 0.008 0.954 0.409 0.000 0.000 0.000 0.000 0.000 0.000 1.370 NNW 0.004 0.272 0.363 0.000 0.000 0.000 0.000 0.000 0.000 0.640 SUBTOTAL 0.091 9.809 5.586 0.182 0.000 0.000 0.000 0.000 0.000 15.668 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2202 TOTAL HOURS OF STABILITY CLASS F 345 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS F 345 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2202 TOTAL HOURS CALM 2 METEOROLOGICAL FACILITY: WATTS BAR NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 9.51 AND 45.63 METERS WIND SPEED AND DIRECTION MEASURED AT 9.72 METER LEVEL DATE PRINTED: 2022/01/14 MEAN WIND SPEED = 1.44 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS

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WBL-22-019 E76 of 77

Watts Bar Nuclear Power Plant Units 1 and 2 2021 Annual Radioactive Effluent Release Report Meteorological Data JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS G (DELTA T > 4.0 C/100 M)

WATTS BAR NUCLEAR PLANT OCT 1, 2021 - DEC 31, 2021 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 0.000 0.000 0.000 0.000 NNE 0.000 0.045 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.046 NE 0.002 0.136 0.045 0.000 0.000 0.000 0.000 0.000 0.000 0.183 ENE 0.002 0.045 0.136 0.000 0.000 0.000 0.000 0.000 0.000 0.183 E 0.001 0.045 0.091 0.000 0.000 0.000 0.000 0.000 0.000 0.137 ESE 0.001 0.091 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.092 SE 0.001 0.091 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.092 SSE 0.002 0.227 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.229 S 0.002 0.182 0.045 0.000 0.000 0.000 0.000 0.000 0.000 0.229 SSW 0.006 0.545 0.182 0.000 0.000 0.000 0.000 0.000 0.000 0.733 SW 0.020 1.953 0.454 0.000 0.000 0.000 0.000 0.000 0.000 2.427 WSW 0.032 3.043 0.817 0.000 0.000 0.000 0.000 0.000 0.000 3.892 W 0.031 3.179 0.545 0.000 0.000 0.000 0.000 0.000 0.000 3.755 WNW 0.023 2.316 0.454 0.000 0.000 0.000 0.000 0.000 0.000 2.793 NW 0.010 0.863 0.363 0.000 0.000 0.000 0.000 0.000 0.000 1.236 NNW 0.004 0.409 0.091 0.000 0.000 0.000 0.000 0.000 0.000 0.504 SUBTOTAL 0.136 13.170 3.224 0.000 0.000 0.000 0.000 0.000 0.000 16.530 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2202 TOTAL HOURS OF STABILITY CLASS G 364 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS G 364 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2202 TOTAL HOURS CALM 3 METEOROLOGICAL FACILITY: WATTS BAR NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 9.51 AND 45.63 METERS WIND SPEED AND DIRECTION MEASURED AT 9.72 METER LEVEL DATE PRINTED: 2022/01/14 MEAN WIND SPEED = 1.19 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS

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WBL-22-019 E77 of 77

WBL-22-019, Annual Radioactive Effluent Release Report

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