ML20115E357

Annual Radioactive Effluent Release Report for 2019 Monitoring Period

ML20115E357
Person / Time
Site:	Sequoyah
Issue date:	04/24/2020
From:	Rasmussen M Tennessee Valley Authority
To:	Document Control Desk, Office of Nuclear Material Safety and Safeguards, Office of Nuclear Reactor Regulation
References
Download: ML20115E357 (100)

Text

um Tennessee Valley Authority, Sequoyah Nuclear Plant, P.O. Box 2000, Soddy Daisy, Tennessee 37384 April24,2020 10 CFR 50.4 10 CFR 50.36a 10 CFR 50, Appendix I A TIN: Document Control Desk U.S. Nuclear Regulatory Commission Washington, D. C. 20555-0001 Sequoyah Nuclear Plant, Units 1 and 2 Renewed Facility Operating License Nos. DPR-77 and DPR-79 NRC Docket Nos. 50-327, 50-328, and 72-034

Subject:

Annual Radioactive Effluent Release Report for 2019 Monitoring Period Enclosed is the Annual Radioactive Effluent Release Report (ARERR) for the period of January 1 to December 31, 2019. This report (Enclosure 1) is being submitted in accordance with the respective Sequoyah Nuclear Plant (SQN), Units 1 and 2, Technical Specification (TS) 5.6.2 and Certificate of Compliance for Spent Fuel Storage Casks Nos. 1014 and 1032, Chapter 5.

Offsite Dose Calculation Manual (ODCM), Section 5.2 requires that a Radiological Impact Assessment be submitted with the ARERR for the same reporting period. The assessment is included as Enclosure 2. There were no changes to the ODCM during the reporting period.

There are no regulatory commitments contained in this letter. If you have any questions concerning this matter, please contact Mr. Jeffrey Sowa at (423) 843-8129.

~~---

Respectfully, Matthew Rasmussen Site Vice President Sequoyah Nuclear Plant

Enclosures:

1. Annual Radioactive Effluent Release Report, Sequoyah Nuclear Plant, January -

December 2019

2. Radiological Impact Assessment Report, Sequoyah Nuclear Plant, January - December 2019 printed on recycled paper

ENCLOSURE 1 ANNUAL RADIOACTIVE EFFLUENT RELEASE REPORT SEQUOYAH NUCLEAR PLANT JANUARY - DECEMBER 2019

2019 SEQUOYAH NUCLEAR PLANT (SQN)

EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT I. REGULATORY LIMITS A. Gaseous Effluents

1. 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:

a. 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.

b. Iodine-131 (I-131), Iodine-133 (I-133), tritium, and all radionuclides in particulate form with half-lives greater than eight days:

- Less than or equal to 1500 mrem/year to any organ.

2. Air dose due to noble gases released in gaseous effluents to areas at and beyond the unrestricted area boundary shall be limited to the following:

a. 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.

b. 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.

3. Dose to a member of the public from Iodine-131, Iodine-133, tritium, and radionuclides in particulate form with half-lives greater than eight days in gaseous effluents released to areas at and beyond the unrestricted area boundary shall be limited to the following:

a. Less than or equal to 7.5 mrem to any organ during any calendar quarter.

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

B. Liquid Effluents

1. The annual average concentration of radioactivity released in liquid effluents to unrestricted areas shall be limited to the concentrations 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 2.0E-04 microcuries/milliliter (µCi/ml) total activity.

E1-2

2. The dose or dose commitment to a member of the public from radioactivity in liquid effluents released to unrestricted areas shall be limited to:

a. Less than or equal to 1.5 mrem to the total body and less than or equal to 5 mrem to any organ during any calendar quarter.

b. Less than or equal to 3 mrem to the total body and less than or equal to 10 mrem to any organ during any calendar year.

II. EFFLUENT CONCENTRATION LIMITS A. Liquids

• 1. 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 2.0E-04 µCi/ml is applied. This ECL is based on the Xenon-135 (Xe-135) concentration in air (submersion dose) converted to an equivalent concentration in water as discussed in the International Commission on Radiological Protection (ICRP), Publication 2.

• These values are used as applicable limits for liquid and gaseous effluents.

B. Gaseous

• 1. The maximum permissible dose rates for gaseous releases are defined in the plant Offsite Dose Calculation Manual (ODCM).

a. Noble gas dose rate at the unrestricted area boundary:

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

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

b. Iodine-131, Iodine-133, tritium, and particulates with half-lives greater than eight days dose rate at the unrestricted area boundary:

- Less than or equal to 1500 mrem/year to any organ.

• These values are used as applicable limits for liquid and gaseous effluents.

III. AVERAGE ENERGY SQN's ODCM limits the dose equivalent rates due to the release of noble gases to less than or equal to 500 mrem/year to the total body and less than or equal to 3000 mrem/year to the skin. The use of dose rate is in accordance with NUREG-0133, Preparation of Radiological Effluent Technical Specifications for Nuclear Power Plants. Since the release rate is not used for effluent control, the average energy discussed in Regulatory Guide 1.21 (used for release rate control) is not included in this report.

E1-3

IV. MEASUREMENTS AND APPROXIMATIONS OF TOTAL RADIOACTIVITY NOTE: Every effort is made to ensure that effluent releases from SQN are conducted such that the ODCM Lower Limit of Detection (LLD) values are met. Whenever an analysis does not identify a radioisotope, a value of "0.00E-01 or 0.00+E01 Ci" is recorded for the release. This does not necessarily mean that no activity was released for that particular radionuclide, but that the concentration was below the ODCM and analysis LLD. Refer to Tables A and B for estimates of these typical LLD values.

A. Fission and Activation Gases Airborne effluent gaseous activity is continuously monitored and recorded. Additional grab samples from the shield building, auxiliary building, service building, and condenser vacuum exhausts are taken and analyzed at least monthly to determine the quantity of noble gas activity released for the month based on the average vent flow rates recorded for the sample period. Also, noble gas samples are collected and evaluated for the shield and auxiliary buildings following startup, shutdown, or rated thermal power change exceeding 15 percent within one hour (sampling is only required if the dose equivalent I-131 concentration in the primary coolant or the noble gas activity monitor shows that the containment activity has increased more than a factor of 3).

The quantity of noble gases released through the shield and auxiliary building exhausts due to purging or venting of containment and releases of waste gas decay tanks are also determined.

The total noble gas activity released for the month is then determined by summing of the activity released from each vent for the sampling periods.

B. Iodines and Particulates Iodine and particulate activity is continuously sampled. Charcoal and particulate samples are taken from the shield and auxiliary building exhausts and analyzed at least weekly to determine the total activity released from the plant based on the average vent flow rates recorded for the sampling period.

Also, particulate and charcoal samples are taken from the auxiliary and shield building exhausts once per 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> for 2 days following startup, shutdown, or a rated thermal power change exceeding 15 percent within 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br />. The quantity of iodine and particulate released from each vent during each sampling period is then determined using the average vent flow rates recorded for the sampling period and activity concentration.

The total particulate and iodine activity released for the month is then determined by summing all activity released from the shield and auxiliary building exhausts for the sampling periods.

E1-4

C. Carbon-14 in Gaseous Releases The Carbon-14 production and effluent source term estimates were based on Electric Power Research Institute methodology provided in EPRI Report 1021106, Estimation of Carbon-14 in Nuclear Power Plant Gaseous Effluents, December 2010. It was determined that 21.6 curies of Carbon-14 is generated annually at SQN. However, only 98 percent is considered released as gas and only the carbon dioxide form (20 percent) of that is used in the gaseous dose calculations.

D. Liquid Effluents Batch (Radwaste and during periods of primary to secondary leakage, condensate regenerants to cooling tower blowdown)

Total gamma isotopic activity concentrations are determined on each batch of liquid effluent prior to release. The total activity of a released batch is determined by summing each nuclide's concentration and multiplying by the total volume discharged. The total activity released during a month is then determined by summing the activity content of each batch discharged during the month.

There were no changes made to the radioactive waste systems and/or the Process Control Program (PCP) for this calendar year.

Continuous Releases and Periodic Continuous Releases (Condensate regenerants, turbine building sump, and steam generator blowdown)

Total gamma isotopic activity and tritium concentrations are determined monthly on one composite sample each from the condensate system, and the turbine building sump. The tritium value is applied to releases over the month. Total gamma isotopic activity concentration for Units 1 and 2 steam generator blowdown is determined 3 times a week. In addition to ODCM Table 2.2-1, tritium concentrations are determined 3 times a week, averaged for the month, and applied to releases over the month. The total activity of the continuous release is determined by summing each nuclide's concentration and multiplying by the total volume discharged.

E1-5

Monitoring Wells SQN started conducting an investigation of tritium releases to the groundwater in 2003 due to identification of tritium in one of the on-site monitoring wells. This study involved pressure testing of the radwaste discharge line, installation and sampling of groundwater wells, visual inspection under the refueling water storage tanks (RWSTs) and inspection of drain lines. In addition to the one on-site Radiological Environmental Monitoring Program (REMP) groundwater monitoring well, SQN also has 29 non-REMP monitoring wells to support monitoring the onsite groundwater plume and for the presence or increase of radioactivity. SQN updated the number of wells in 2019 to better monitor the onsite groundwater. These wells are sampled periodically for tritium. The tritium concentrations obtained in 2019 from these non-REMP wells are listed below. Initial and follow up analyses for the semi-annual sampling procedure indicated no gamma activity.

Tritium Tritium In Well Date In pCi/L Date pCi/L GP-10 04/03/19 < 313 ---- ----

GP-13 01/10/19 2110 04/03/19 2020 W10 01/09/19 5580 04/30/19 6510 W10 07/24/19 3930 10/30/19 3490 W10 11/26/19 5220 12/19/19 4810 W11 01/10/19 < 147 04/01/19 < 310 W11 07/24/19 < 153 10/30/19 < 228 W12 01/09/19 951 04/01/19 691 W12 07/24/19 682 10/30/19 932 W12 11/26/19 931 12/20/19 743 W13 01/08/19 < 148 04/03/19 < 365 W13 07/23/19 < 194 10/30/19 < 205 W15 01/09/19 197 04/03/19 < 368 W15 07/23/19 275 10/31/19 < 220 W15 11/26/19 < 230 12/20/19 < 213 W16 01/08/19 594 04/03/19 422 W16 07/22/19 672 10/29/19 455 W18 01/08/19 570 04/03/19 445 W18 07/23/19 523 10/30/19 621 W24 01/09/19 170 04/02/19 < 308 W24 07/22/19 335 10/28/19 < 226 W25 04/02/19 < 320 10/28/19 < 223 W26 04/02/19 < 303 12/19/19 < 233 W27 04/03/19 383 10/29/19 541 W28 04/03/19 < 310 10/29/19 < 237 E1-6

Tritium Tritium In Well Date In pCi/L Date pCi/L W29 01/09/19 378 04/03/19 < 365 W30 01/09/19 391 04/01/19 < 315 W32 04/02/19 < 314 ---- ----

W34 04/02/19 < 314 ---- ----

W35 04/01/19 < 309 ---- ----

W36 01/08/19 179 04/03/19 < 344 W36 07/23/19 < 162 10/31/19 232 W37 07/22/19 < 182 10/28/19 < 211 W38 07/24/19 281 10/29/19 < 211 W39 07/23/19 < 176 10/29/19 < 216 W40 07/24/19 < 181 10/29/19 < 222 W41 07/24/19 < 176 10/30/19 < 232 W42 07/24/19 < 181 10/30/19 < 234 W43 07/25/19 < 164 10/31/19 < 229 W44 07/25/19 332 10/30/19 331 W45i 07/23/19 926 10/30/19 528 W45s 07/23/19 1700 10/30/19 360 W46i 07/23/19 363 10/30/19 582 W46s 07/23/19 284 10/30/19 371 W47i 07/24/19 20100 09/30/19 23300 W47i 10/01/19 19000 10/31/19 20900 W47i 11/26/19 25800 12/19/19 22100 W47s 07/24/19 13600 10/01/19 21600 W47s 10/31/19 17400 11/26/19 19400 W47s 12/19/19 18600 ---- ----

W48 07/24/19 1270 10/30/19 1550 W9 01/08/19 < 147 04/03/19 < 312 W9 07/22/19 < 170 10/29/19 < 227 E1-7

Doses from I-131 Water Ingestion Pathway The REMP requirements as specified in Table 3.12-1 from NUREG 1301, Offsite Dose Calculation Manual Guidance: Standard Radiological Effluent Controls for Pressurized Water Reactors, dated April 1991, requires an I-131 specific analysis for drinking water pathway samples if the annual dose from I-131 is greater than 1 mrem.

In order to evaluate the need for implementation of this additional analysis, the drinking water pathway dose from I-131 to the maximum organ and age group was calculated.

The results being reported confirm that the drinking water pathway dose from I-131 was less than the 1 mrem limit and that the performance of the I-131 specific analysis is not required for SQN REMP drinking water samples.

Quarter 1 2 3 4 Totals I-131 Ci 0.00E+01 0.00E+01 0.00E+01 0.00E+01 0.00E+01 Infant/Thyroid (mrem) 0.00E+01 0.00E+01 0.00E+01 0.00E+01 0.00E+01 Population/Thyroid 0.00E+01 0.00E+01 0.00E+01 0.00E+01 0.00E+01 (mrem)

E1-8

V. BATCH RELEASES

1. Liquid (Radwaste only) 1st Quarter 2nd Quarter Units

a. Number of releases 20 25 Each

b. Total time period of releases 3260 3980 Minutes

c. Maximum time period of release 189 241 Minutes

d. Average time period of releases 163 159 Minutes

e. Minimum time period of release 129 120 Minutes

f. Average dilution stream flow during release periods 107186 37902 CFS Liquid (Radwaste only) 3rd Quarter 4th Quarter Units

a. Number of releases 45 55 Each

b. Total time period of releases 7430 8720 Minutes

c. Maximum time period of release 215 208 Minutes

d. Average time period of releases 165 158 Minutes

e. Minimum time period of release 120 101 Minutes

f. Average dilution stream flow during release periods 27444 41216 CFS

2. Gaseous (Batches only - containment purges, and waste gas decay tanks) 1st Quarter 2nd Quarter Units

a. Number of releases 30 29 Each

b. Total time period of releases 21000 21100 Minutes

c. Maximum time period of release 1040 1020 Minutes

d. Average time period of releases 699 726 Minutes

e. Minimum time period of release 10 41 Minutes Gaseous (Batches only - containment purges, and waste gas decay tanks) 3rd Quarter 4th Quarter Units

a. Number of releases 29 30 Each

b. Total time period of releases 20200 64300 Minutes

c. Maximum time period of release 1010 23600 Minutes

d. Average time period of releases 696 2140 Minutes

e. Minimum time period of release 40 100 Minutes E1-9

VI. ABNORMAL RELEASES

1. Liquid 1st Half 2nd Half Units

a. Number of releases 0 0

b. Total activity released 0.00E+01 0.00E+01 Ci

2. Gaseous 1st Half 2nd Half Units

a. Number of releases 0 0

b. Total activity released 0.00E+01 0.00E+01 Ci E1-10

Release Type: Gaseous (Steam)

Release Point: Unit 1 PORVs 1, 2, 3, & 4 Date(s) of Release: 10/12/19 13:29 - 11/3/2019 22:58 This evaluation is for the release to the environment that occurred from Unit 1 PORVs 1, 2, 3 and 4 during the U1R23 refueling outage. Following the reactor trip, the Steam Generator PORVs were open for periods of time during the outage. The following is data used to determine the curies and dose impacts as a result of the release:

• The evaluation assumed the release was continuous from PORVs 1, 2, 3, and 4.

• There have been no gamma emitting radionuclides identified in any Secondary Coolant samples during the previous cycle.

The volume of the steam generator was taken from Westinghouse Guidelines for Secondary Water Chemistry. The listed normal water level value of 3516 ft3 was used as a conservative value. This calculation assumes that the total volume of the 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:

3516 ft3/generator

• 2.832E+04 ml/ft3

• 4 generators = 3.983E+08 ml 2.19E-06 µCi/ml

• 3.983E+08 ml = 8.73E+02 µCi of H3 or 8.73E-04 Ci of H3 The activity of 8.73E-04 curies was added to the 4th Quarter Table Curies Released in Gaseous Ground Level Releases, and the 4th Quarter doses in Enclosure 2: Table 4 Doses from Airborne Effluents.

Individual Doses Pathway Dose Quarterly Percent of Location External Limit Limit Sector/Distance/Unit Gamma Air 0.00E+01 mrad 5 mrad <1 N/A Beta Air 0.00E+01 mrad 10 mrad <1 N/A Submersion Total Body 0.00E+01 mrad 10 mrad <1 N/A Skin 0.00E+01 mrad 10 mrad <1 N/A Organ Dose Child/Thyroid 3.40E-07 mrem 7.5 mrem <1 WSW/1152/meters Child/Total Body 3.40E-07 mrem 7.5 mrem <1 WSW/1152/meters Population Doses Total Body Dose 4.63E-06 man-rem Maximum Organ Dose (organ) 4.63E-06 man-rem (Thyroid, Liver, Bone, GIT, Lung, Kidney)

E1-11

Release Type: Gaseous (Steam)

Release Point: Unit 1 PORVs 1, 2, 3, & 4 Date(s) of Release: 11/24/19 20:04 - 11/24/2019 21:00 This evaluation is for the release to the environment that occurred from Unit 1 PORVs 1, 2, 3 and 4 during the U1R23 refueling outage. Following the reactor trip, the Steam Generator PORVs were open for periods of time during the outage. The following is data used to determine the curies and dose impacts as a result of the release:

• The evaluation assumed the release was continuous from PORVs 1, 2, 3, and 4.

• There have been no gamma emitting radionuclides identified in any Secondary Coolant samples during the previous cycle.

The volume of the steam generator was taken from Westinghouse Guidelines for Secondary Water Chemistry. The listed normal water level value of 3516 ft3 was used as a conservative value. This calculation assumes that the total volume of the 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:

3516 ft3/generator

• 2.832E+04 ml/ft3

• 4 generators = 3.983E+08 ml 1.30E-06 µCi/ml

• 3.983E+08 ml = 5.18E+02 µCi of H3 or 5.18E-04 Ci of H3 The activity of 5.18E-04 was added to the 4th Quarter Table Curies Released in Gaseous Ground Level Releases, and the 4th Quarter doses in Enclosure 2: Table 4 Doses from Airborne Effluents.

Individual Doses Pathway Dose Quarterly Percent of Location External Limit Limit Sector/Distance/Unit Gamma Air 0.00E+01 mrad 5 mrad <1 N/A Beta Air 0.00E+01 mrad 10 mrad <1 N/A Submersion Total Body 0.00E+01 mrad 10 mrad <1 N/A Skin 0.00E+01 mrad 10 mrad <1 N/A Organ Dose Child/Thyroid 2.02E-07 mrem 7.5 mrem <1 WSW/1152/meters Child/Total Body 2.02E-07 mrem 7.5 mrem <1 WSW/1152/meters Population Doses Total Body Dose 2.75E-06 man-rem Maximum Organ Dose (organ) 2.75E-06 man-rem (Thyroid, Liver, Bone, GIT, Lung, Kidney)

Release Type: Gaseous (Steam)

E1-12

Release Point: Unit 2 PORVs 1, 2, 3, & 4 Date(s) of Release: 12/12/19 04:49 - 12/12/2019 04:53 This evaluation is for the release to the environment that occurred from Unit 1 PORVs 1, 2, 3 and 4 during the Unit 2 Forced Outage in December 2019. Following the reactor trip, the Steam Generator PORVs were open for a short period of time. The following is data used to determine the curies and dose impacts as a result of the release:

• The evaluation assumed the release was continuous from PORVs 1, 2, 3, and 4.

• There have been no gamma emitting radionuclides identified in any Secondary Coolant samples during the previous cycle.

The volume of the steam generator was taken from Westinghouse Guidelines for Secondary Water Chemistry. The listed normal water level value of 3516 ft3 was used as a conservative value. This calculation assumes that the total volume of the 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:

3516 ft3/generator

• 2.832E+04 ml/ft3

• 4 generators = 3.983E+08 ml 8.53E-07 µCi/ml

• 3.983E+08 ml = 3.40E+02 µCi of H3 or 3.40E-04 Ci of H3 The activity of 3.40E-04 curies was added to the 4th Quarter Table Curies Released in Gaseous Ground Level Releases, and the 4th Quarter doses in Enclosure 2: Table 4 Doses from Airborne Effluents.

Individual Doses Pathway Dose Quarterly Percent of Location External Limit Limit Sector/Distance/Unit Gamma Air 0.00E+01 mrad 5 mrad <1 N/A Beta Air 0.00E+01 mrad 10 mrad <1 N/A Submersion Total Body 0.00E+01 mrad 10 mrad <1 N/A Skin 0.00E+01 mrad 10 mrad <1 N/A Organ Dose Child/Thyroid 1.32E-07 mrem 7.5 mrem <1 WSW/1152/meters Child/Total Body 1.32E-07 mrem 7.5 mrem <1 WSW/1152/meters Population Doses Total Body Dose 1.80E-06 man-rem Maximum Organ Dose (organ) 1.80E-06 man-rem (Thyroid, Liver, Bone, GIT, Lung, Kidney)

E1-13

Liquid Effluents-Summation of Releases During the Period Starting: 1-Jan-2019 Ending: 30-Jun-2019 Est.

Total Type Of Effluent Units Quarter 1 Quarter 2 Error A. Fission & Activation Products

1. Total Release (Not Including Tritium, Gases, Alpha) Ci 4.50E-03 1.98E-02 18%

2. Average Diluted Concentration During Period µCi/ml 2.26E-09 9.35E-09

3. Percent Of Applicable Limit B. Tritium

1. Total Release Ci 3.62E+01 3.47E+02 18%

2. Average Diluted Concentration During Period µCi/ml 1.82E-05 1.64E-04

3. Percent Of Applicable Limit  % *

• C. Dissolved And Entrained Gases

1. Total Release Ci 0.00E+01 5.59E-05 39%

2. Average Diluted Concentration During Period µCi/ml 0.00E+01 2.64E-11

3. Percent Of Applicable Limit  % 0.00E+01 1.32E-05 D. Gross Alpha Radioactivity

1. Total Release Curies 0.00E+01 0.00E+01 N/A***

E. Total Waste Volume Released Liters 4%

7.02E+07 7.11E+07 (Pre-Dilution)

F. Volume Of Dilution Water Used 1.99E+09 2.12E+09 Liters 4%

G. Radwaste Volume Released Liters 1.131E+06 1.356E+06 N/A

• Applicable Limits are expressed in terms of dose. See Tables 5-8 of the 2019 Radiological Impact Assessment Report.

• • Zeroes indicate that no radioactivity was present at detectable levels.

• • • N/A - Errors in measurement are not reported for these values since none were identified during the reporting period.

E1-14

Liquid Effluents-Summation of Releases During the Period Starting: 1-Jul-2019 Ending: 31-Dec-2019 Est.

Total Type Of Effluent Units Quarter 3 Quarter 4 Error A. Fission & Activation Products

1. Total Release (Not Including Tritium, Gases, Alpha) Ci 6.50E-03 1.19E-02 18%

2. Average Diluted Concentration During Period µCi/ml 2.51E-09 4.26E-09

3. Percent Of Applicable Limit B. Tritium

1. Total Release Ci 9.43E+02 4.91E+02 18%

2. Average Diluted Concentration During Period µCi/ml 3.63E-04 1.77E-04

3. Percent Of Applicable Limit  % *

• C. Dissolved And Entrained Gases

1. Total Release Ci 4.34E-03 1.09E-03 39%

2. Average Diluted Concentration During Period µCi/ml 1.67E-09 3.91E-10

3. Percent Of Applicable Limit  % 8.35E-04 1.96E-04 D. Gross Alpha Radioactivity

1. Total Release Curies 0.00E+01** 0.00E+01 N/A***

E. Total Waste Volume Released Liters 4%

9.53E+07 9.22E+07 (Pre-Dilution) 2.60E+09 2.78E+09 F. Volume Of Dilution Water Used Liters 4%

G. Radwaste Volume Released Liters 2.530E+06 2.989E+06 N/A

• Applicable Limits are expressed in terms of dose. See Tables 5-8 of the 2019 Radiological Impact Assessment Report.

• • Zeroes indicate that no radioactivity was present at detectable levels.

• • • N/A - Errors in measurement are not reported for these values since none were identified during the reporting period.

E1-15

Curies Released in Liquid Effluents During the Period Starting: 1-Jan-2019 Ending 31-Mar-2019 Continuous Batch Total Tritium 1.08E-01 3.61E+01 3.61E+01 FISSION & ACTIVATION PRODUCTS Chromium-51 0.00E+00 1.85E-05 1.85E-05 Cobalt-58 0.00E+00 1.80E-03 1.80E-03 Cobalt-60 0.00E+00 9.05E-04 9.05E-04 Nickel-63 0.00E+00 8.79E-04 8.79E-04 Antimony-124 0.00E+00 1.90E-04 1.90E-04 Antimony-125 0.00E+00 7.07E-04 7.07E-04 TOTALS 0.00E+01 4.50E-03 4.50E-03 DISSOLVED AND ENTRAINED GASES TOTALS 0.00E+01 0.00E+01 0.00E+01

• Zeroes indicate that no activity was present at detectable levels.

E1-16

Curies Released in Liquid Effluents During the Period Starting: 1-Apr-2019 Ending 30-Jun-2019 Continuous Batch Total Tritium 1.18E-01 3.47E+02 3.47E+02 FISSION & ACTIVATION PRODUCTS Manganese-54 0.00E+01 5.83E-05 5.83E-05 Cobalt-58 0.00E+01 1.30E-03 1.30E-03 Cobalt-60 0.00E+01 2.71E-03 2.71E-03 Nickel-63 0.00E+01 1.57E-02 1.57E-02 Zinc- 65 0.00E+01 1.08E-05 1.08E-05 Niobium-95 0.00E+01 3.11E-05 3.11E-05 Niobium-97 0.00E+01 3.70E-06 3.70E-06 Antimony-124 0.00E+01 5.43E-06 5.43E-06 Antimony-125 0.00E+01 1.44E-05 1.44E-05 TOTALS 0.00E+01 1.98E-02 1.98E-02 DISSOLVED AND ENTRAINED GASES Xenon-133 0.00E+01 5.59E-05 5.59E-05 TOTALS 0.00E+01 5.59E-05 5.59E-05

• Zeroes indicate that no activity was present at detectable levels.

E1-17

Curies Released in Liquid Effluents During the Period Starting: 1-Jul-2019 Ending 30-Sep-2019 Continuous Batch Total Tritium 1.78E-01 9.43E+02 9.43E+02 FISSION & ACTIVATION PRODUCTS Chromium-51 0.00E+01 7.44E-05 7.44E-05 Manganese-54 0.00E+01 4.89E-05 4.89E-05 Cobalt-58 0.00E+01 6.10E-04 6.10E-04 Cobalt-60 0.00E+01 2.66E-03 2.66E-03 Nickel-63 0.00E+01 2.77E-03 2.77E-03 Niobium-95 0.00E+01 6.88E-05 6.88E-05 Niobium-97 0.00E+01 4.67E-05 4.67E-05 Tin-125 0.00E+01 2.15E-05 2.15E-05 Antimony-125 0.00E+01 2.02E-04 2.02E-04 TOTALS 0.00E+01 6.50E-03 6.50E-03 DISSOLVED AND ENTRAINED GASES Argon-41 0.00E+01 3.34E-05 3.34E-05 Xe-133m 0.00E+01 1.73E-05 1.73E-05 Xenon-133 0.00E+01 4.01E-03 4.01E-03 Xenon-135 0.00E+01 2.74E-04 2.74E-04 TOTALS 0.00E+01 4.34E-03 4.34E-03

• Zeroes indicate that no activity was present at detectable levels.

E1-18

Curies Released in Liquid Effluents During the Period Starting: 1-Oct-2019 Ending 31-Dec-2019 Continuous Batch Total Tritium 1.48E-01 4.91E+02 4.91E+02 FISSION & ACTIVATION PRODUCTS Chromium-51 0.00E+01 3.56E-03 3.56E-03 Manganese-54 0.00E+01 3.49E-05 3.49E-05 Cobalt-58 0.00E+01 1.75E-03 1.75E-03 Cobalt-60 0.00E+01 2.71E-03 2.71E-03 Nickel-63 0.00E+01 2.07E-03 2.07E-03 Zirconium-95 0.00E+01 9.91E-05 9.91E-05 Niobium-95 0.00E+01 1.77E-04 1.77E-04 Niobium-97 0.00E+01 4.75E-05 4.75E-05 Silver-110m 0.00E+01 3.16E-04 3.16E-04 Tin-117m 0.00E+01 8.13E-06 8.13E-06 Antimony 122 0.00E+01 1.46E-05 1.46E-05 Antimony-124 0.00E+01 4.48E-04 4.48E-04 Antimony-125 0.00E+01 5.89E-04 5.89E-04 TOTALS 0.00E+01 1.18E-02 1.18E-02 DISSOLVED AND ENTRAINED GASES Xenon-133 0.00E+01 9.64E-04 9.64E-04 Xenon-135 0.00E+01 1.24E-04 1.24E-04 TOTALS 0.00E+01 1.09E-03 1.09E-03

• Zeroes indicate that no activity was present at detectable levels.

E1-19

TABLE A LIQUID TYPICAL LLD EVALUATION(1) t(2)

Nuclide ODCM LLD 1 hr 8 hr 32 hr Manganese-54 5.0E-07 3.36E-08 3.36E-08 3.37E-08 Cobalt-58 5.0E-07 2.53E-08 2.54E-08 2.56E-08 Iron-59 5.0E-07 5.26E-08 5.29E-08 5.37E-08 Cobalt-60 5.0E-07 4.63E-08 4.63E-08 4.64E-08 Zinc-65 5.0E-07 2.95E-08 2.95E-08 2.96E-08 Molybdenum-99 5.0E-07 1.55E-07 1.67E-07 2.15E-07 Cesium-134 5.0E-07 1.91E-08 1.91E-08 1.92E-08 Cesium-137 5.0E-07 3.87E-08 3.87E-08 3.87E-08 Cerium-141 5.0E-07 2.80E-08 2.81E-08 2.87E-08 Cerium-144 5.0E-06 1.11E-07 1.12E-07 1.12E-07 Iodine-131 1.0E-06 2.28E-08 2.34E-08 2.55E-08 Krypton-87 1.0E-05 1.16E-07 5.25E-07 (3)

Krypton-88 1.0E-05 9.95E-08 5.49E-07 (3)

Xenon-133 1.0E-05 4.19E-08 4.36E-08 4.98E-08 Xenon-133m 1.0E-05 1.42E-07 1.55E-07 2.13E-07 Xenon-135 1.0E-05 2.06E-08 3.50E-08 2.17E-07 Xenon-138 1.0E-05 8.37E-06 (3) (3)

Nuclide ODCM LLD Typical LLD Tritium 1.0E-05 1.2E-06 Gross Alpha 1.0E-07 2.0E-08 Strontium-89/90 5.0E-08 3.8E-08/1.4E-08 Iron-55 1.0E-06 1.3E-08 Notes: (1) LLD values are in µCi/ml.

(2) t is the time between sample collection and counting time.

(3) T 1/2 too short.

E1-20

Gaseous Effluents - Summation of Releases During the Period Starting: 1-Jan-2019 Ending: 30-Jun-2019 Type of Effluent Units Quarter 1 Quarter 2 Estimated Total Error A. Fission and Activation Products

1. Total Release Ci 2.51E-01 1.76E-01 11%

2. Average Release Rate For Period µCi/sec 3.23E-02 2.23E-02

3. Percent of Applicable Limit  % *

• B. Radioiodines

1. Total Iodine-131 Ci 0.00E+01 0.00E+01 N/A***

2. Average Release Rate For Period µCi/sec 0.00E+01 0.00E+01

3. Percent of Applicable Limit  % *

• C. Particulates

1. Particulates (Half-Lives > 8 Days) Ci 0.00E+01 0.00E+01 N/A

2. Average Release Rate For Period µCi/sec 0.00E+01 0.00E+01

3. Percent of Applicable Limit  % * *

4. Gross Alpha Radioactiviy Ci 0.00E+01 0.00E+01 D. Tritium

1. Total Release Ci 5.00E-01 6.48E-01 15%

2. Average Release Rate For Period µCi/sec 6.43E-02 8.24E-02

3. Percent of Applicable Limit  % *

• E. Carbon-14

1. Total Release Ci 5.63E+00 6.27E+00 N/A

2. Average Release Rate For Period µCi/sec 7.25E-01 7.97E-01

3. Percent of Applicable Limit  % * *

• Applicable Limits are expressed in terms of dose. See Tables 1-4 of the 2019 Radiological Impact Assessment Report.

• • Zeroes indicate that no radioactivity was present at detectable levels.

• • • N/A - Errors in measurement are not reported for these values since none were identified during the reporting period.

E1-21

Gaseous Effluents - Summation of Releases During the Period Starting: 1-Jul-2019 Ending: 31-Dec-2019 Type of Effluent Units Quarter 3 Quarter 4 Estimated Total Error A. Fission and Activation Products

1. Total Release Ci 2.84E-01 4.50E+00 11%

2. Average Release Rate For Period µCi/sec 3.57E-02 5.66E-01

3. Percent of Applicable Limit  % *

• B. Radioiodines

1. Total Iodine-131 Ci 0.00E+01 0.00E+01 N/A***

2. Average Release Rate For Period µCi/sec 0.00E+01 0.00E+01

3. Percent of Applicable Limit  % *

• C. Particulates

1. Particulates (Half-Lives > 8 Days) Ci 0.00E+01 0.00E+01 16%

2. Average Release Rate For Period µCi/sec 0.00E+01 0.00E+01

3. Percent of Applicable Limit  % * *

4. Gross Alpha Radioactiviy Ci 0.00E+01 0.00E+01 D. Tritium

1. Total Release Ci 1.33E+00 8.47E+00 15%

2. Average Release Rate For Period µCi/sec 1.67E-01 1.07E+00

3. Percent of Applicable Limit  % *

• E. Carbon-14

1. Total Release Ci 5.55E+00 4.14E+00 N/A

2. Average Release Rate For Period µCi/sec 6.98E-01 5.21E-01

3. Percent of Applicable Limit  % * *

• Applicable Limits are expressed in terms of dose. See Tables 1-4 of the 2019 Radiological Impact Assessment Report.

• • Zeroes indicate that no radioactivity was present at detectable levels.

• • • N/A - Errors in measurement are not reported for these values since none were identified during the reporting period.

E1-22

Curies Released Gaseous Ground Level Releases During the Period Starting: 1-Jan-2019 Ending: 31-Mar-2019 CONTINUOUS BATCH TOTAL FISSION GASES Argon-41 0.00E+01 1.45E-01 1.45E-01 Xenon-133 0.00E+01 9.99E-02 9.99E-02 Xenon-135m 0.00E+01 2.74E-04 2.74E-04 Xenon-135 0.00E+01 6.41E-03 6.41E-03 TOTALS 0.00E+01 2.51E-01 2.51E-01 IODINES TOTALS 0.00E+01 0.00E+01 0.00E+01 PARTICULATES TOTALS 0.00E+01 0.00E+01 0.00E+01 TRITIUM Tritium 3.69E-01 1.30E-01 4.99E-01 CARBON-14 Carbon-14 (CO2 form) 1.13E+00 0.00E+01 1.13E+00 Carbon-14 (Total) 5.63E+00 0.00E+01 5.63E+00

• Zeros indicate that no radioactivity was present at detectable levels.

E1-23

Curies Released Gaseous Ground Level Releases During the Period Starting: 1-Apr-2019 Ending: 30-Jun-2019 CONTINUOUS BATCH TOTAL FISSION GASES Argon-41 0.00E+01 1.39E-01 1.39E-01 Xenon-133 0.00E+01 3.52E-02 3.52E-02 Xenon-135 0.00E+01 1.27E-03 1.27E-03 TOTALS 0.00E+01 1.76E-01 1.76E-01 IODINES TOTALS 0.00E+01 0.00E+01 0.00E+01 PARTICULATES TOTALS 0.00E+01 0.00E+01 0.00E+01 TRITIUM Tritium 5.22E-01 1.26E-01 6.48E-01 CARBON-14 Carbon-14 (CO2 form) 1.25E+00 0.00E+01 1.25E+00 Carbon-14 (Total) 6.27E+00 0.00E+01 6.27E+00

• Zeros indicate that no radioactivity was present at detectable levels.

E1-24

Curies Released Gaseous Ground Level Releases During the Period Starting: 1-July-2019 Ending: 30-Sep-2019 CONTINUOUS BATCH TOTAL FISSION GASES Argon-41 0.00E+01 2.65E-01 2.65E-01 Xenon-133 0.00E+01 1.85E-02 1.85E-02 Xenon-135 0.00E+01 2.71E-04 2.71E-04 TOTALS 0.00E+01 2.84E-01 2.84E-01 IODINES TOTALS 0.00E+01 0.00E+01 0.00E+01 PARTICULATES TOTALS 0.00E+01 0.00E+01 0.00E+01 TRITIUM Tritium 1.09E+00 2.38E-01 1.33E+00 CARBON-14 Carbon-14 (CO2 form) 1.11E+00 0.00E+01 1.11E+00 Carbon-14 (Total) 5.55E+00 0.00E+01 5.55E+00

• Zeros indicate that no radioactivity was present at detectable levels.

E1-25

Curies Released Gaseous Ground Level Releases During the Period Starting: 1-Oct-2019 Ending: 31-Dec-2019 CONTINUOUS BATCH TOTAL FISSION GASES Argon-41 0.00E+01 4.44E+00 4.44E+00 Xenon-133 0.00E+01 5.53E-02 5.53E-02 Xenon-135 0.00E+01 5.52E-04 5.52E-04 TOTALS 0.00E+01 4.50E+00 4.50E+00 IODINES TOTALS 0.00E+01 0.00E+01 0.00E+01 PARTICULATES TOTALS 0.00E+01 0.00E+01 0.00E+01 TRITIUM Tritium 2.10E+00 6.37E+00 8.47E+00 CARBON-14 Carbon-14 (CO2 form) 8.28E-01 0.00E+01 8.28E-01 Carbon-14 (Total) 4.14E+00 0.00E+01 4.14E+00

• Zeros indicate that no radioactivity was present at detectable levels.

E1-26

TABLE B GASEOUS "TYPICAL" LLD EVALUATION(1)

Noble Gas t(2)

Nuclide ODCM LLD 1 hr 1.5 hr Krypton-87 1.0E-04 2.08E-06 2.73E-06 Krypton-88 1.0E-04 1.61E-06 1.81E-06 Xenon-133 1.0E-04 6.61E-07 6.63E-07 Xenon-133m 1.0E-04 2.34E-06 2.35E-06 Xenon-135 1.0E-04 3.43E-07 3.56E-07 Xenon-138 1.0E-04 1.40E-04 6.10E-04 Particulate Sample(3) 1 hr(4) 24 hr(4) 7.0 day(4)

Manganese-54 1.0E-11 7.47E-12 3.12E-13 4.48E-14 Cobalt-58 1.0E-11 5.62E-12 2.35E-13 3.46E-14 Iron-59 1.0E-11 1.20E-11 5.02E-13 7.49E-14 Cobalt-60 1.0E-11 1.07E-11 4.46E-13 6.38E-14 Zinc-65 1.0E-11 6.71E-12 2.80E-13 4.03E-14 Molybdenum-99 1.0E-11 3.43E-11 1.61E-12 4.70E-13 Cesium-134 1.0E-11 4.25E-12 1.77E-13 2.54E-14 Cesium-137 1.0E-11 8.48E-12 3.54E-13 5.05E-14 Cerium-141 1.0E-11 5.10E-12 2.15E-13 3.26E-14 Cerium-144 1.0E-11 2.01E-11 8.33E-13 1.20E-13 Iodine-131 1.0E-11 4.76E-12 2.07E-13 3.77E-14 Charcoal Sample Iodine-131 1.0E-12 7.25E-12 3.15E-13 5.74E-14 Notes:

(1) LLD values are in µCi/ml.

(2) t is the time between sample collection and counting time.

(3) LLD based on sample time + 30 min. sample to analysis.

(4) LLD may be increased by a factor of 10 when samples collected for 2264hours are analyzed.

E1-27

TABLE B GASEOUS "TYPICAL" LLD EVALUATION(1)

(continued)

Nuclide ODCM LLD Typical LLD Tritium 1.0E-06 1.0E-11 Gross Alpha 1.0E-11 1.5E-14 Strontium-89 1.0E-11 1.0E-14 Strontium-90 1.0E-11 1.0E-15 NOTE:

(1) LLD values are in µCi/cc.

E1-28

SOLID WASTE (RADIOACTIVE SHIPMENTS)

Solid Waste Shipped Offsite for Burial or Disposal (not Irradiated Fuel) 12 Month Est. Tot.

1. Type of Waste Unit Period Error %

a. Spent Resins, Filter Sludges, Evaporator Bottoms, m3 15.8 +5.00E-01 etc. Ci 1.04E+02 +2.29E+01

b. Dry Active Waste, Compressible Waste m3 940 +1.00E+01 Contaminated Equipment, etc. Ci 2.58E+00 +2.29E+01

c. Irradiated Components, Control m3 None N/A Rods, etc. Ci None N/A

d. Other: Asbestos Sent for Processing m3 None N/A Ci None N/A The reported volume for category a waste is based on the volume of the disposal container. Waste volumes for categories b, c, and d are based on the net waste volume rather than the shipping container volume. During transit, the waste for categories b and d may settle resulting in an overall reduced volume. The reduction in disposal volume is estimated to be 10 percent due to settling. Volume estimates for category b and d wastes were based on a visual inspection of the containers contents and its percent full.

The estimated total error (percent) for the total Curies shipped is based on calculating the square root of the sum of the squares method. Three parameters were considered as important for estimating the error. The parameters were variances with sample preparation and counting geometry, survey instrument accuracy for dose to Curie evaluations, and in-field sampling techniques. The assigned values for these parameters were 20, 10, and 5 percent, respectively.

Total error (%) = (0.202 + 0.102 + 0.052)1/2 x 100 = 22.9%

E1-29

SOLID WASTE (RADIOACTIVE SHIPMENTS) (continued)

2. Estimate of Major Nuclide Composition (by type of waste)

a. Spent resins, filter sludges, evaporator bottoms, etc. (nuclides determined by measurement)

Curies Percent

1. Hydrogen-3 1.85E-02 0.02

2. Carbon-14 7.00E-01 0.67

3. Chromium-51 4.42E-04 0.00

4. Manganese-54 1.92E+00 1.84

5. Iron-55 3.98E+00 3.82

6. Iron-59 1.24E-04 0.00

7. Cobalt-57 5.51E-02 0.05

8. Cobalt-58 2.33E-01 0.22

9. Cobalt-60 3.87E+01 37.14

10. Nickel-59 1.55E-01 0.15

11. Nickel-63 5.44E+01 52.20

12. Zinc-65 3.95E-01 0.38

13. Krypton-85 2.94E-02 0.03

14. Strontium-89 8.47E-10 0.00

15. Strontium-90 7.07E-03 0.01

16. Zirconium-95 1.22E-02 0.01

17. Niobium-95 2.70E-02 0.03

18. Technitium-99 2.51E-03 0.00

19. Silver-110m 5.94E-08 0.00

20. Tin-113 2.94E-03 0.00

21. Antimony-124 4.69E-04 0.00

22. Antimony-125 1.63E+00 1.57

23. Cesium-134 1.23E-01 0.12

24. Cesium-137 1.66E+00 1.59

25. Cerium-144 1.34E-01 0.13

26. Plutonium-238 2.64E-05 0.00

27. Plutonium-239 5.87E-06 0.00

28. Plutonium-240 5.87E-06 0.00

29. Plutonium-241 2.71E-02 0.03

30. Americium-241 2.07E-04 0.00

31. Curium-242 1.38E-07 0.00

32. Curium-243 1.65E-04 0.00

33. Curium-244 1.44E-04 0.00 E1-30

SOLID WASTE (RADIOACTIVE SHIPMENTS) (continued)

b. Dry active waste, compressible waste, contaminated equipment, etc. (nuclides determined by estimate)

Curies Percent

1. Hydrogen-3 5.87E-03 0.23

2. Carbon-14 3.24E-06 0.00

3. Chromium-51 9.88E-01 38.32

4. Manganese-54 7.63E-02 2.96

5. Iron-55 2.07E-01 8.02

6. Iron-59 2.75E-02 1.07

7. Cobalt-57 1.25E-03 0.05

8. Cobalt-58 3.44E-01 13.34

9. Cobalt-60 2.44E-01 9.45

10. Nickel-63 1.11E-02 0.43

11. Zinc-65 9.98E-03 0.39

12. Strontium-89 1.47E-06 0.00

13. Strontium-90 7.75E-06 0.00

14. Zirconium-95 2.24E-01 8.68

15. Niobium-95 4.19E-01 16.26

16. Antimony-124 1.61E-03 0.06

17. Antimony-125 1.16E-05 0.00

18. Cesium-137 4.95E-03 0.19

19. Cerium-144 1.43E-02 0.56

20. Plutoniuu-238 7.60E-07 0.00

21. Plutonium-239 4.05E-07 0.00

22. Plutonium-240 4.05E-07 0.00

23. Plutonium-241 6.96E-06 0.00

24. Americium-241 9.00E-07 0.00

25. Curium-243 5.18E-07 0.00

26. Curium-244 5.18E-07 0.00

c. Irradiated Components Curies Percent None N/A N/A

d. Other: Curies Percent None N/A N/A E1-31

SOLID WASTE (RADIOACTIVE SHIPMENTS) (continued)

3. Solid Waste Disposition

a. Spent resins, filter sludges, evaporator bottoms, etc.

Number of Shipments Type Quantity Mode of Transportation Destination 1 AU Motor Freight EnergySolutions Services, Inc.

1560 Bear Creek Rd.

Oak Ridge, TN 1 AU Motor Freight EnergySolutions Services, LLC Clive Disposal Site Containerized Waste Facility Interstate 80, Exit 49 Clive, UT 84029 1 B Motor Freight Waste Control Specialist, LLC Compact Waste Disposal Facility 9998 W. State Hwy. 176 Andrews, TX 79714 1 C Motor Freight Waste Control Specialist, LLC Compact Waste Disposal Facility 9998 W. State Hwy. 176 Andrews, TX 79714

b. Dry active waste, compressible waste, contaminated equipment, etc.

Number of Shipments Type Quantity Mode of Transportation Destination 1 LQ Motor Freight EnergySolutions Services , Inc.

1560 Bear Creek Rd.

Oak Ridge, TN 5 A-LSA II Motor Freight TOXCO Inc.

TOXCO Materials Management Center 109 Flint Rd.

Oak Ridge, TN 4 A-LSA II Motor Freight TOXCO Inc.

Limited Quantity TOXCO Materials Management Center 109 Flint Rd.

Oak Ridge, TN 12 Limited Quantity Motor Freight TOXCO Inc.

TOXCO Materials Management Center 109 Flint Rd.

Oak Ridge, TN E1-32

SOLID WASTE (RADIOACTIVE SHIPMENTS) (continued)

c. Irradiated components, control rods, etc.

Number of Shipments Type Quantity Mode of Transportation Destination None N/A N/A N/A

d. Other: Asbestos for processing Number of Shipments Type Quantity Mode of Transportation Destination None N/A N/A N/A

4. Irradiated Fuel Shipments (Disposition)

Number of Shipments Type Quantity Mode of Transportation Destination None N/A N/A N/A

5. Solidification of Waste Was solidification performed? No If yes, solidification media: N/A E1-33

Independent Spent Fuel Storage Installation SQN implemented use of an independent spent fuel storage installation (ISFSI) on July13, 2004.

10 CFR 72.214 Certificate of Compliance (CoC) Nos. 1014 and 1032 correspond to the two certificates of the spent fuel storage systems in use at the ISFSI. The ISFSI is located on site, within the protected area and is designed to hold 90 spent fuel storage canisters (SFSCs). CoC Nos. 1014 and 1032 Appendix A Chapter 5 requires an annual report in accordance with 10 CFR 72.44(d)(3). CoC Nos. 1014 and 1032 Chapter 5 also provides that the ISFSI operations may be considered part of plant operations for the purposes of the radiological environmental monitoring program.

CoC No. 1014 Section 5.4a states The HI-STORM 100 Cask System does not create any radioactive material or have any radioactive waste treatment systems. Therefore, specific operating procedures for the control of radioactive effluents are not required.

Specification 3.1.1, Multi-Purpose Canister (MPC), provides assurance that there are not radioactive effluents from SFSC.

CoC No. 1032 Section 5.1a states, The HI-STORM FW MPC Storage System does not create any radioactive materials or have any radioactive waste treatment systems. Therefore, specific operating procedures for the control of radioactive effluents are not required. Specification 3.1.1, Multi-Purpose Canister (MPC), provides assurance that there are not radioactive effluents from the SFSC.

The Environmental Protection Agency limits for the total dose to the public in the vicinity of a nuclear power plant, established in the Environmental Dose Standard of 40 CFR 190, are as follows:

Total Body 25 mrem/year Thyroid 75 mrem/year Any other organ 25 mrem/year Although CoC Nos. 1014 and 1032 provide that the HI-STORM 100 Cask System and HI-STORM FW MPC Storage System do not create any radioactive material or have any radioactive waste treatment systems, for this report, total site releases include the SQN ISFSI as part of the SQN site and part of plant operations. These releases are within 40 CFR 190 limits and 10 CFR 72.104 limits.

E1-34

ENCLOSURE 2 RADIOLOGICAL IMPACT ASSESSMENT REPORT SEQUOYAH NUCLEAR PLANT JANUARY - DECEMBER 2019

INTRODUCTION Potential doses to maximum individuals and the population around Sequoyah Nuclear Plant (SQN) are calculated for each quarter as required in Section 5.2 of the Offsite Dose Calculation Manual (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 riverflow data measured during the period. In this report, the doses resulting from releases are described and compared to limits established for SQN.

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."

The limits for doses in unrestricted areas from airborne noble gases released are:

Less than or equal to 5 mrad per quarter and 10 mrad per year (per reactor unit) for gamma radiation,

- and -

Less than or equal to 10 mrad per quarter and 20 mrad per year (per reactor unit) for beta radiation.

The limit for the dose to a member of the general public in an unrestricted area from iodines and particulates released in airborne effluents is:

Less than or equal to 7.5 mrem per quarter and 15 mrem per year (per reactor unit) to any organ.

The limits for doses to a member of the general public from radioactive material in liquid effluents released to unrestricted areas are:

Less than or equal to 1.5 mrem per quarter and 3 mrem per year (per reactor unit) to the total body,

- and -

Less than or equal to 5 mrem per quarter and 10 mrem per year (per reactor unit) to any organ The Environmental Protection Agency limits for total dose to the public in the vicinity of a nuclear power plant, established in the Environmental Dose Standard of 40 CFR 190 are:

Less than or equal to 25 mrem per year to the total body, Less than or equal to 75 mrem per year to the thyroid,

- and -

Less than or equal to 25 mrem per year to any other organ.

E2-2

DOSE CALCULATIONS Estimated doses to the public are determined using computer models: 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/CR-1004. 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 1 through 9.

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 Releases from SQN are considered ground-level releases. The ground-level Joint Frequency Distribution (JFD) is derived from windspeeds and directions measured 10 meters above ground and from the vertical temperature difference between 10 and 46 meters, and are presented for each quarter in Attachment 1.

Meteorological Data Meteorological variables at SQN are measured continuously. Measurements collected include wind speed, wind direction, and temperature at heights of 10, 46, and 91 meters above the ground. Quarterly JFD are calculated for each release point using the appropriate levels of meteorological data. A JFD gives 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 (gamma-air and beta-air doses) are made for points at and beyond the unrestricted area boundary as described in the SQN ODCM. The highest of these doses is then selected.

E2-3

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 four possible contributing pathways: ingestion of cow/goat 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. To conservatively account for beef ingestion, a beef ingestion dose equal to that for the highest unrestricted area boundary location is added to each identified receptor. For ground contamination, the dose added to the organ dose being calculated is the total body dose calculated for that location, i.e., it is assumed that the dose to an individual organ is equal to the total body dose.

Doses from airborne effluents are presented in Tables 1-4.

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 SQN. Parameters used to determine the doses are based on guidance given by the NRC (in Regulatory Guides 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 SQN ODCM.

Liquid Release Points and River Data Radioactivity concentrations in the Tennessee River are calculated assuming that releases in liquid effluents are continuous. Routine liquid releases from SQN, located at Tennessee River Mile 484, are made through diffusers which extend into the Tennessee River. It is assumed that releases to the river through these diffusers will initially be entrained in one-fifth of the water which flows past the plant. The QWATA code makes the assumption that this mixing condition holds true until the water is completely mixed at the first downstream dam, at Tennessee River Mile 471.

E2-4

Doses are calculated for locations within a 50-mile radius downstream of the plant site. The maximum potential recreation dose is calculated for a location immediately downstream from the 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 (East Side Utilities).

This could be interpreted as indicating that the maximum individual, as assumed for liquid releases from Sequoyah, is an individual who obtains all of his drinking water at East Side Utilities, consumes fish caught from the Tennessee River between SQN and Chickamauga Dam, and spends 500 hours0.00579 days <br />0.139 hours <br />8.267196e-4 weeks <br />1.9025e-4 months <br /> per year on the shoreline just below the outfall from Sequoyah. Dose estimates for the maximum individual due to liquid effluents for each quarter in the period are presented in Tables 5-8, along with the average river flows past the plant site for the periods.

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 50-mile human population distribution.

POPULATION DOSES Population doses for the highest exposed organ due to airborne effluents are calculated for an estimated 1,060,000 persons living within a 50-mile radius of the plant site. Doses from external pathways and inhalation are based on the 50-mile human population distribution.

Ingestion population doses 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 are presented in Tables 1-4 and Tables 5-8.

DIRECT RADIATION External gamma radiation levels were measured by dosimeters deployed around SQN as part of the offsite REMP. The quarterly gamma radiation levels determined from these dosimeters during this reporting period averaged approximately 14.0 mrem/quarter at onsite (at or near the site boundary) stations and approximately 13.1 mrem/quarter at offsite stations, or approximately 0.9 mrem/quarter higher at onsite than at offsite stations. This difference is consistent with levels measured for preoperation and construction phases of the TVA nuclear plant site where the average radiation levels onsite were generally 1-3 mrem/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 dosimeter readings tend to mask any small increments which may be due to plant operations. Thus, there E2-5

was no identifiable increase in dose rate levels attributable to direct radiation from plant equipment and/or gaseous effluents.

DOSE TO A MEMBER OF THE PUBLIC INSIDE THE UNRESTRICTED AREA BOUNDARY As stated in the SQN 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 fence for an entire work year (2000/8760 hours). Results from onsite dosimeter measurements for the calendar year in question indicate that the highest onsite dosimeter reading was 22 mrem after subtraction of the annual background value of 63 mrem/year (from perimeter dosimeters around Sequoyah and Area dosimeter posting data for the year). Using this value and multiplying by the ratio of the occupancy times (2000/8760), the external dose was 5.02 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 well below the 10 CFR 20 annual limit of 100 mrem.

TOTAL DOSE To determine compliance with 40 CFR 190, annual total dose contributions to the maximum individual from SQN radioactive effluents and 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 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 9 Total Dose from Fuel Cycle.

E2-6

Tables 1 and 2 Doses from Airborne Effluents First Quarter Individual Doses Quarterly Percent of Location X/Q D/Q Pathway Dose Limit Limit Sector/Distance/Unit (sec/m3) (1/m2)

External Gamma Air 1.73E-04 5 mrad <1 SSW/1840/meters 4.78E-06 1.18E-08 Beta Air 7.68E-05 10 mrad <1 SSW/1840/meters 4.78E-06 1.18E-08 Submersion Total Body 1.29E-04 10 mrad <1 SSW/2129/meters 3.88E-06 9.18E-09 Skin 1.94E-04 10 mrad <1 SSW/2129/meters 3.88E-06 9.18E-09 Organ Doses1 (Max) Child/Bone 3.32E-01 7.5 mrem 4.4 SSW/4532/meters 1.31E-06 2.50E-09 Child/Thyroid 6.66E-02 7.5 mrem <1 SSW/4532/meters 1.31E-06 2.50E-09 Child/Total Body 6.66E-02 7.5 mrem <1 SSW/4532/meters 1.31E-06 2.50E-09 Population Doses Total Body Dose 4.77E-01 man-rem Maximum Organ Dose (organ) 2.37E+00 man-rem (Bone)

Second Quarter Individual Doses Quarterly Percent of Location X/Q D/Q Pathway Dose Limit Limit Sector/Distance/Unit (sec/m3) (1/m2)

External Gamma Air 2.51E-04 5 mrad <1 N/950/meters 6.96E-06 1.56E-08 Beta Air 9.63E-05 10 mrad <1 N/950/meters 6.96E-06 1.56E-08 Submersion Total Body 1.78E-04 10 mrad <1 NNW/864/meters 5.31E-06 6.94E-09 Skin 2.64E-04 10 mrad <1 NNW/864/meters 5.31E-06 6.94E-09 Organ Doses1 (Max) Child/Bone 5.04E-01 7.5 mrem 6.7 WSW/1152/meters 1.74E-06 1.71E-09 Child/Thyroid 1.01E-01 7.5 mrem 1.3 WSW/1152/meters 1.74E-06 1.71E-09 Child/Total Body 1.01E-01 7.5 mrem 1.3 WSW/1152/meters 1.74E-06 1.71E-09 Population Doses Total Body Dose 5.36E-01 man-rem Maximum Organ Dose (organ) 2.67E+00 man-rem (Bone)

Population doses can be compared to the natural background dose for the entire 50-mile population of about 95,400 man-rem/year (based on 90 mrem/year for natural background).

1 Organ Doses include contributions from Carbon-14 in the form of Carbon Dioxide.

E2-7

Tables 3 and 4 Doses from Airborne Effluents Third Quarter Individual Doses Quarterly Percent of Location X/Q D/Q Pathway Dose Limit Limit Sector/Distance/Unit (sec/m3) (1/m2)

External Gamma Air 3.84E-04 5 mrad <1 SSW/1840/meters 6.37E-06 1.07E-08 Beta Air 1.39E-04 10 mrad <1 SSW/1840/meters 6.37E-06 1.07E-08 Submersion Total Body 2.84E-04 10 mrad <1 SSW/2129/meters 5.17E-06 8.32E-09 Skin 4.20E-04 10 mrad <1 SSW/2129/meters 5.17E-06 8.32E-09 Organ Doses1 (Max) Child/Bone 4.38E-01 7.5 mrem 5.8 SSW/4532/meters 1.76E-06 2.27E-09 Child/Thyroid 8.80E-02 7.5 mrem 1.2 SSW/4532/meters 1.76E-06 2.27E-09 Child/Total Body 8.80E-02 7.5 mrem 1.2 SSW/4532/meters 1.76E-06 2.27E-09 Population Doses Total Body Dose 5.56E-01 man-rem Maximum Organ Dose (organ) 2.75E+00 man-rem (Bone)

Fourth Quarter Individual Doses Quarterly Percent of Location X/Q D/Q Pathway Dose Limit Limit Sector/Distance/Unit (sec/m3) (1/m2)

External Gamma Air 5.98E-03 5 mrad <1 SSW/1840/meters 5.71E-06 1.25E-08 Beta Air 2.12E-03 10 mrad <1 SSW/1840/meters 5.71E-06 1.25E-08 Submersion Total Body 4.46E-03 10 mrad <1 SSW/2129/meters 4.64E-06 9.79E-09 Skin 6.57E-03 10 mrad <1 SSW/2129/meters 4.64E-06 9.79E-09 Organ Doses1 (Max) Child/Bone 3.16E-01 7.5 mrem 4.2 WSW/1152/meters 1.74E-06 2.06-09 Child/Thyroid 6.72E-02 7.5 mrem <1 WSW/1152/meters 1.74E-06 2.06-09 Child/Total Body 6.72E-02 7.5 mrem <1 WSW/1152/meters 1.74E-06 2.06-09 Population Doses Total Body Dose 4.63E-01 man-rem Maximum Organ Dose (organ) 2.11E+00 man-rem (Bone)

Population doses can be compared to the natural background dose for the entire 50-mile population of about 95,400 man-rem/year (based on 90 mrem/year for natural background).

1 Organ Doses include contributions from Carbon-14 in the form of Carbon Dioxide.

E2-8

Tables 5 and 6 Doses from Liquid Effluents First Quarter Individual Doses (mrem)

Quarterly Percent of Age Group Organ Dose Limit Limit Child Total Body 7.50E-05 1.5 mrem <1%

Child Bone 8.40E-05 5 mrem <1%

Child Thyroid 7.40E-05 5 mrem <1%

Average Riverflow past SQN (cubic feet per second): 107186 Population Doses Total Body Dose 6.10E-03 man-rem Maximum Organ Dose (organ) 6.30E-03 man-rem (Bone)

Second Quarter Individual Doses (mrem)

Quarterly Percent of Age Group Organ Dose Limit Limit Child Total Body 1.90E-03 1.5 mrem <1%

Child Bone 2.40E-03 5 mrem <1%

Child Thyroid 1.90E-03 5 mrem <1%

Average Riverflow past SQN (cubic feet per second): 37902 Population Doses Total Body Dose 1.30E-01 man-rem Maximum Organ Dose (organ) 1.40E-01 man-rem (Bone)

Population doses can be compared to the natural background dose for the entire 50-mile population of about 95,400 man-rem/year (based on 90 mrem/year for natural background).

E2-9

Tables 7 and 8 Doses from Liquid Effluents Third Quarter Individual Doses (mrem)

Quarterly Percent of Age Group Organ Dose Limit Limit Child Total Body 6.80E-03 1.5 mrem <1%

Child Bone 6.90E-03 5 mrem <1%

Child Thyroid 6.80E-03 5 mrem <1%

Average Riverflow past SQN (cubic feet per second): 27444 Population Doses Total Body Dose 4.7E-01 man-rem Maximum Organ Dose (organ) 4.7E-01 man-rem (GIT, Bone, Liver, Lung, Kidney, Thyroid)

Fourth Quarter Individual Doses (mrem)

Quarterly Percent of Age Group Organ Dose Limit Limit Child Total Body 2.40E-03 1.5 mrem <1%

Child Bone 2.40E-03 5 mrem <1%

Child Thyroid 2.40E-03 5 mrem <1%

Average Riverflow past SQN (cubic feet per second): 41216 Population Doses Total Body Dose 1.6E-01 man-rem Maximum Organ Dose (organ) 1.6E-01 man-rem (GIT, Bone, Liver, Lung, Kidney, Thyroid)

Population doses can be compared to the natural background dose for the entire 50-mile population of about 95,400 man-rem/year (based on 90 mrem/year for natural background).

E2-10

Table 9 Total Dose from Fuel Cycle First Second Third Fourth Dose Quarter Quarter Quarter Quarter Total Body or any Organ (except thyroid)

Total body air submersion 1.29E-04 1.78E-04 2.84E-04 4.46E-03 Critical organ dose (air) 3.32E-01 5.04E-01 4.38E-01 3.16E-01 Total body dose (liquid) 7.50E-05 1.90E-03 6.80E-03 2.40E-03 Maximum organ dose (liquid) 8.40E-05 2.40E-03 6.90E-03 2.40E-03 Direct Radiation Dose 0.00E+01 0.00E+01 0.00E+01 0.00E+01 Total 3.32E-01 5.08E-01 4.52E-01 3.25E-01 Cumulative Total Dose (Total body or any other organ) mrem 1.62E+00 Annual Dose Limit (mrem) 25 Percent of Limit 6.48 Thyroid Dose (mrem)

Total body air submersion 1.29E-04 1.78E-04 2.84E-04 4.46E-03 Thyroid dose (airborne) 6.66E-02 1.01E-01 8.80E-02 6.72E-02 Total body dose (liquid) 7.50E-05 1.90E-03 6.80E-03 2.40E-03 Thyroid dose (liquid) 7.40E-05 1.90E-03 6.80E-03 2.40E-03 Direct Radiation Dose 0.00E+01 0.00E+01 0.00E+01 0.00E+01 Total 6.69E-02 1.05E-01 1.02E-01 7.65E-02 Cumulative Total Dose (Thyroid) mrem 3.50E-01 Annual Dose Limit (mrem) 75 Percent of Limit 0.47 E2-11

Attachment 1 Joint Frequency Distribution Tables A1-1

JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS A (DELTA T<=-1.9 C/100 M)

SEQUOYAH NUCLEAR PLANT JAN 1, 2019 - MAR 31, 2019 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 0.186 0.000 0.000 0.000 0.186 NNE 0.000 0.000 0.000 0.000 0.186 0.604 0.000 0.000 0.000 0.790 NE 0.000 0.000 0.000 0.093 0.232 0.232 0.000 0.000 0.000 0.557 ENE 0.000 0.000 0.000 0.046 0.000 0.000 0.000 0.000 0.000 0.046 E 0.000 0.000 0.000 0.046 0.046 0.000 0.000 0.000 0.000 0.093 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 0.046 0.000 0.000 0.000 0.000 0.000 0.046 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 0.046 0.093 0.000 0.000 0.000 0.139 SSW 0.000 0.000 0.000 0.093 0.279 0.232 0.000 0.000 0.000 0.604 SW 0.000 0.000 0.000 0.046 0.186 0.186 0.000 0.000 0.000 0.418 WSW 0.000 0.000 0.000 0.000 0.000 0.093 0.000 0.000 0.000 0.093 W 0.000 0.000 0.000 0.000 0.186 0.000 0.000 0.000 0.000 0.186 WNW 0.000 0.000 0.000 0.046 0.139 0.418 0.000 0.000 0.000 0.604 NW 0.000 0.000 0.000 0.000 0.093 0.372 0.000 0.000 0.000 0.464 NNW 0.000 0.000 0.000 0.000 0.186 0.232 0.000 0.000 0.000 0.418 SUBTOTAL 0.000 0.000 0.000 0.464 1.579 2.647 0.000 0.000 0.000 4.691 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2153 TOTAL HOURS OF STABILITY CLASS A 101 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS A 101 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2153 TOTAL HOURS CALM 0 METEOROLOGICAL FACILITY: SEQUOYAH NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 9.25 AND 45.99 METERS WIND SPEED AND DIRECTION MEASURED AT 9.73 METER LEVEL DATE PRINTED: 2019/05/15 MEAN WIND SPEED = 7.43 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS A1-2

JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS B (-1.9< DELTA T<=-1.7 C/100 M)

SEQUOYAH NUCLEAR PLANT JAN 1, 2019 - MAR 31, 2019 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 0.186 0.232 0.000 0.000 0.000 0.464 NNE 0.000 0.000 0.000 0.000 0.279 0.372 0.046 0.000 0.000 0.697 NE 0.000 0.000 0.000 0.046 0.139 0.046 0.000 0.000 0.000 0.232 ENE 0.000 0.000 0.000 0.046 0.000 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 0.046 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 0.093 0.046 0.046 0.000 0.000 0.000 0.186 SSW 0.000 0.000 0.000 0.139 0.604 0.186 0.000 0.000 0.000 0.929 SW 0.000 0.000 0.000 0.046 0.139 0.046 0.000 0.000 0.000 0.232 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 0.046 0.046 0.046 0.000 0.000 0.000 0.139 WNW 0.000 0.000 0.000 0.000 0.000 0.093 0.000 0.000 0.000 0.093 NW 0.000 0.000 0.000 0.046 0.093 0.046 0.000 0.000 0.000 0.186 NNW 0.000 0.000 0.000 0.046 0.046 0.093 0.000 0.000 0.000 0.186 SUBTOTAL 0.000 0.000 0.000 0.604 1.579 1.208 0.046 0.000 0.000 3.437 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2153 TOTAL HOURS OF STABILITY CLASS B 74 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS B 74 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2153 TOTAL HOURS CALM 0 METEOROLOGICAL FACILITY: SEQUOYAH NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 9.25 AND 45.99 METERS WIND SPEED AND DIRECTION MEASURED AT 9.73 METER LEVEL DATE PRINTED: 2019/05/15 MEAN WIND SPEED = 6.90 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS A1-3

JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS C (-1.7< DELTA T<=-1.5 C/100 M)

SEQUOYAH NUCLEAR PLANT JAN 1, 2019 - MAR 31, 2019 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 0.046 0.279 0.139 0.000 0.000 0.000 0.511 NNE 0.000 0.000 0.000 0.093 0.279 0.511 0.046 0.000 0.000 0.929 NE 0.000 0.000 0.139 0.186 0.000 0.093 0.000 0.000 0.000 0.418 ENE 0.000 0.000 0.046 0.000 0.000 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 0.046 0.000 0.000 0.000 0.000 0.000 0.000 0.046 SE 0.000 0.000 0.000 0.046 0.000 0.000 0.000 0.000 0.000 0.046 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 0.186 0.000 0.139 0.000 0.000 0.000 0.325 SSW 0.000 0.000 0.046 0.836 0.372 0.046 0.000 0.000 0.000 1.301 SW 0.000 0.000 0.046 0.139 0.372 0.000 0.000 0.000 0.000 0.557 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 0.046 0.000 0.186 0.000 0.000 0.000 0.000 0.232 NW 0.000 0.000 0.000 0.093 0.046 0.046 0.000 0.000 0.000 0.186 NNW 0.000 0.000 0.000 0.093 0.232 0.139 0.000 0.000 0.000 0.464 SUBTOTAL 0.000 0.000 0.418 1.765 1.765 1.115 0.046 0.000 0.000 5.109 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2153 TOTAL HOURS OF STABILITY CLASS C 110 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS C 110 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2153 TOTAL HOURS CALM 0 METEOROLOGICAL FACILITY: SEQUOYAH NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 9.25 AND 45.99 METERS WIND SPEED AND DIRECTION MEASURED AT 9.73 METER LEVEL DATE PRINTED: 2019/05/15 MEAN WIND SPEED = 6.13 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS A1-4

JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS D (-1.5< DELTA T<=-0.5 C/100 M)

SEQUOYAH NUCLEAR PLANT JAN 1, 2019 - MAR 31, 2019 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 1.068 1.486 1.811 1.719 0.000 0.000 0.000 6.085 NNE 0.000 0.093 2.415 3.576 2.601 2.369 0.046 0.000 0.000 11.101 NE 0.000 0.046 1.440 0.325 0.325 0.046 0.000 0.000 0.000 2.183 ENE 0.000 0.000 0.279 0.046 0.000 0.000 0.000 0.000 0.000 0.325 E 0.000 0.000 0.139 0.000 0.000 0.000 0.000 0.000 0.000 0.139 ESE 0.000 0.000 0.093 0.046 0.000 0.000 0.000 0.000 0.000 0.139 SE 0.000 0.093 0.093 0.000 0.000 0.000 0.000 0.000 0.000 0.186 SSE 0.000 0.093 0.186 0.000 0.000 0.093 0.000 0.000 0.000 0.372 S 0.000 0.000 0.650 0.511 0.093 0.418 0.000 0.000 0.000 1.672 SSW 0.000 0.000 1.161 2.229 0.836 0.604 0.000 0.000 0.000 4.830 SW 0.000 0.000 1.161 1.254 0.697 0.093 0.000 0.000 0.000 3.205 WSW 0.000 0.046 0.093 0.139 0.279 0.093 0.000 0.000 0.000 0.650 W 0.000 0.093 0.186 0.325 0.046 0.186 0.000 0.000 0.000 0.836 WNW 0.000 0.046 0.325 0.279 0.139 0.372 0.000 0.000 0.000 1.161 NW 0.000 0.093 0.557 0.650 0.511 0.232 0.000 0.000 0.000 2.044 NNW 0.000 0.000 0.557 1.393 0.882 1.068 0.000 0.000 0.000 3.902 SUBTOTAL 0.000 0.604 10.404 12.262 8.221 7.292 0.046 0.000 0.000 38.830 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2153 TOTAL HOURS OF STABILITY CLASS D 836 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS D 836 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2153 TOTAL HOURS CALM 0 METEOROLOGICAL FACILITY: SEQUOYAH NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 9.25 AND 45.99 METERS WIND SPEED AND DIRECTION MEASURED AT 9.73 METER LEVEL DATE PRINTED: 2019/05/15 MEAN WIND SPEED = 5.10 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS A1-5

JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS E (-0.5< DELTA T<= 1.5 C/100 M)

SEQUOYAH NUCLEAR PLANT JAN 1, 2019 - MAR 31, 2019 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 0.279 1.672 1.161 0.372 0.139 0.000 0.000 0.000 3.623 NNE 0.000 0.743 2.740 1.579 0.929 0.232 0.000 0.000 0.000 6.224 NE 0.000 0.279 1.022 0.186 0.000 0.000 0.000 0.000 0.000 1.486 ENE 0.000 0.139 0.046 0.000 0.000 0.000 0.000 0.000 0.000 0.186 E 0.000 0.046 0.046 0.000 0.000 0.000 0.000 0.000 0.000 0.093 ESE 0.000 0.093 0.139 0.000 0.000 0.000 0.000 0.000 0.000 0.232 SE 0.000 0.139 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.139 SSE 0.000 0.046 0.418 0.000 0.000 0.046 0.000 0.000 0.000 0.511 S 0.000 0.046 0.697 0.464 0.232 0.511 0.000 0.000 0.000 1.951 SSW 0.000 0.279 2.276 1.858 1.393 0.743 0.000 0.000 0.000 6.549 SW 0.000 0.139 2.137 1.486 0.604 0.093 0.000 0.000 0.000 4.459 WSW 0.000 0.139 0.743 0.232 0.139 0.046 0.000 0.000 0.000 1.301 W 0.000 0.186 0.418 0.093 0.046 0.093 0.000 0.000 0.000 0.836 WNW 0.000 0.046 0.139 0.325 0.139 0.046 0.000 0.000 0.000 0.697 NW 0.000 0.046 0.511 0.511 0.139 0.139 0.000 0.000 0.000 1.347 NNW 0.000 0.093 0.557 0.557 0.418 0.093 0.000 0.000 0.000 1.719 SUBTOTAL 0.000 2.740 13.562 8.453 4.412 2.183 0.000 0.000 0.000 31.352 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2153 TOTAL HOURS OF STABILITY CLASS E 675 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS E 675 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2153 TOTAL HOURS CALM 0 METEOROLOGICAL FACILITY: SEQUOYAH NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 9.25 AND 45.99 METERS WIND SPEED AND DIRECTION MEASURED AT 9.73 METER LEVEL DATE PRINTED: 2019/05/15 MEAN WIND SPEED = 3.79 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS A1-6

JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS F ( 1.5< DELTA T<= 4.0 C/100 M)

SEQUOYAH NUCLEAR PLANT JAN 1, 2019 - MAR 31, 2019 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 0.139 0.372 0.046 0.000 0.000 0.000 0.000 0.000 0.557 NNE 0.000 0.232 3.019 0.232 0.000 0.000 0.000 0.000 0.000 3.484 NE 0.000 0.650 0.975 0.000 0.000 0.000 0.000 0.000 0.000 1.626 ENE 0.000 0.093 0.139 0.000 0.000 0.000 0.000 0.000 0.000 0.232 E 0.000 0.186 0.046 0.000 0.000 0.000 0.000 0.000 0.000 0.232 ESE 0.000 0.046 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.046 SE 0.000 0.093 0.186 0.000 0.000 0.000 0.000 0.000 0.000 0.279 SSE 0.000 0.232 0.186 0.000 0.000 0.000 0.000 0.000 0.000 0.418 S 0.000 0.093 0.232 0.093 0.000 0.000 0.000 0.000 0.000 0.418 SSW 0.000 0.139 1.579 0.697 0.186 0.000 0.000 0.000 0.000 2.601 SW 0.000 0.000 0.975 0.325 0.046 0.046 0.000 0.000 0.000 1.393 WSW 0.000 0.139 0.325 0.046 0.000 0.000 0.000 0.000 0.000 0.511 W 0.000 0.139 0.093 0.000 0.046 0.000 0.000 0.000 0.000 0.279 WNW 0.000 0.000 0.000 0.046 0.000 0.000 0.000 0.000 0.000 0.046 NW 0.000 0.000 0.232 0.000 0.000 0.000 0.000 0.000 0.000 0.232 NNW 0.000 0.232 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.232 SUBTOTAL 0.000 2.415 8.360 1.486 0.279 0.046 0.000 0.000 0.000 12.587 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2153 TOTAL HOURS OF STABILITY CLASS F 271 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS F 271 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2153 TOTAL HOURS CALM 0 METEOROLOGICAL FACILITY: SEQUOYAH NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 9.25 AND 45.99 METERS WIND SPEED AND DIRECTION MEASURED AT 9.73 METER LEVEL DATE PRINTED: 2019/05/15 MEAN WIND SPEED = 2.33 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS A1-7

JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS G (DELTA T > 4.0 C/100 M)

SEQUOYAH NUCLEAR PLANT JAN 1, 2019 - MAR 31, 2019 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 0.325 0.650 0.000 0.000 0.000 0.000 0.000 0.000 0.975 NE 0.000 0.232 0.836 0.000 0.000 0.000 0.000 0.000 0.000 1.068 ENE 0.000 0.046 0.139 0.000 0.000 0.000 0.000 0.000 0.000 0.186 E 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 ESE 0.000 0.093 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.093 SE 0.000 0.000 0.093 0.000 0.000 0.000 0.000 0.000 0.000 0.093 SSE 0.000 0.186 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.186 S 0.000 0.093 0.046 0.000 0.000 0.000 0.000 0.000 0.000 0.139 SSW 0.000 0.186 0.232 0.000 0.000 0.000 0.000 0.000 0.000 0.418 SW 0.000 0.093 0.325 0.000 0.000 0.000 0.000 0.000 0.000 0.418 WSW 0.000 0.000 0.000 0.046 0.000 0.000 0.000 0.000 0.000 0.046 W 0.000 0.093 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.093 WNW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 NW 0.000 0.046 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.046 NNW 0.000 0.046 0.046 0.000 0.000 0.000 0.000 0.000 0.000 0.093 SUBTOTAL 0.000 1.486 2.462 0.046 0.000 0.000 0.000 0.000 0.000 3.994 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2153 TOTAL HOURS OF STABILITY CLASS G 86 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS G 86 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2153 TOTAL HOURS CALM 0 METEOROLOGICAL FACILITY: SEQUOYAH NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 9.25 AND 45.99 METERS WIND SPEED AND DIRECTION MEASURED AT 9.73 METER LEVEL DATE PRINTED: 2019/05/15 MEAN WIND SPEED = 1.69 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS A1-8

JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS A (DELTA T<=-1.9 C/100 M)

SEQUOYAH NUCLEAR PLANT APR 1, 2019 - JUN 30, 2019 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 0.092 0.046 0.000 0.000 0.000 0.137 NNE 0.000 0.000 0.000 0.137 0.504 0.367 0.000 0.000 0.000 1.008 NE 0.000 0.000 0.000 0.321 0.137 0.000 0.000 0.000 0.000 0.458 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 0.092 0.046 0.092 0.000 0.000 0.000 0.229 SSW 0.000 0.000 0.092 0.596 1.100 0.092 0.000 0.000 0.000 1.879 SW 0.000 0.000 0.046 0.687 0.092 0.000 0.000 0.000 0.000 0.825 WSW 0.000 0.000 0.000 0.000 0.046 0.000 0.000 0.000 0.000 0.046 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 0.000 0.046 0.000 0.000 0.000 0.000 0.046 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 0.092 0.000 0.000 0.000 0.000 0.092 SUBTOTAL 0.000 0.000 0.137 1.833 2.200 0.596 0.000 0.000 0.000 4.766 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2182 TOTAL HOURS OF STABILITY CLASS A 104 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS A 104 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2182 TOTAL HOURS CALM 0 METEOROLOGICAL FACILITY: SEQUOYAH NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 9.25 AND 45.99 METERS WIND SPEED AND DIRECTION MEASURED AT 9.73 METER LEVEL DATE PRINTED: 2019/08/09 MEAN WIND SPEED = 5.80 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS A1-9

JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS B (-1.9< DELTA T<=-1.7 C/100 M)

SEQUOYAH NUCLEAR PLANT APR 1, 2019 - JUN 30, 2019 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 0.275 0.046 0.000 0.000 0.000 0.321 NNE 0.000 0.000 0.046 0.229 0.092 0.137 0.000 0.000 0.000 0.504 NE 0.000 0.000 0.183 0.183 0.046 0.046 0.000 0.000 0.000 0.458 ENE 0.000 0.000 0.000 0.046 0.000 0.000 0.000 0.000 0.000 0.046 E 0.000 0.000 0.092 0.000 0.000 0.000 0.000 0.000 0.000 0.092 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 0.046 0.000 0.000 0.000 0.000 0.000 0.046 SSE 0.000 0.000 0.000 0.046 0.092 0.046 0.000 0.000 0.000 0.183 S 0.000 0.000 0.000 0.229 0.092 0.229 0.000 0.000 0.000 0.550 SSW 0.000 0.000 0.092 1.054 0.779 0.137 0.000 0.000 0.000 2.062 SW 0.000 0.000 0.137 0.733 0.321 0.046 0.000 0.000 0.000 1.237 WSW 0.000 0.000 0.000 0.046 0.000 0.000 0.000 0.000 0.000 0.046 W 0.000 0.000 0.000 0.046 0.000 0.000 0.000 0.000 0.000 0.046 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 0.046 0.092 0.046 0.000 0.000 0.000 0.183 NNW 0.000 0.000 0.000 0.000 0.092 0.000 0.000 0.000 0.000 0.092 SUBTOTAL 0.000 0.000 0.550 2.704 1.879 0.733 0.000 0.000 0.000 5.866 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2182 TOTAL HOURS OF STABILITY CLASS B 128 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS B 128 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2182 TOTAL HOURS CALM 0 METEOROLOGICAL FACILITY: SEQUOYAH NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 9.25 AND 45.99 METERS WIND SPEED AND DIRECTION MEASURED AT 9.73 METER LEVEL DATE PRINTED: 2019/08/09 MEAN WIND SPEED = 5.49 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS A1-10

JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS C (-1.7< DELTA T<=-1.5 C/100 M)

SEQUOYAH NUCLEAR PLANT APR 1, 2019 - JUN 30, 2019 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 0.046 0.000 0.000 0.000 0.000 0.092 NNE 0.000 0.000 0.183 0.321 0.000 0.137 0.000 0.000 0.000 0.642 NE 0.000 0.000 0.183 0.046 0.000 0.000 0.000 0.000 0.000 0.229 ENE 0.000 0.000 0.046 0.000 0.000 0.000 0.000 0.000 0.000 0.046 E 0.000 0.000 0.137 0.046 0.000 0.000 0.000 0.000 0.000 0.183 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 0.046 0.000 0.000 0.000 0.000 0.000 0.046 SSE 0.000 0.000 0.092 0.000 0.046 0.046 0.000 0.000 0.000 0.183 S 0.000 0.000 0.137 0.367 0.000 0.137 0.000 0.000 0.000 0.642 SSW 0.000 0.000 0.229 1.375 0.550 0.275 0.000 0.000 0.000 2.429 SW 0.000 0.000 0.321 0.871 0.229 0.000 0.000 0.000 0.000 1.421 WSW 0.000 0.000 0.000 0.000 0.092 0.046 0.000 0.000 0.000 0.137 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 0.092 0.046 0.046 0.000 0.000 0.000 0.183 NNW 0.000 0.000 0.000 0.000 0.046 0.092 0.000 0.000 0.000 0.137 SUBTOTAL 0.000 0.000 1.329 3.208 1.054 0.779 0.000 0.000 0.000 6.370 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2182 TOTAL HOURS OF STABILITY CLASS C 139 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS C 139 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2182 TOTAL HOURS CALM 0 METEOROLOGICAL FACILITY: SEQUOYAH NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 9.25 AND 45.99 METERS WIND SPEED AND DIRECTION MEASURED AT 9.73 METER LEVEL DATE PRINTED: 2019/08/09 MEAN WIND SPEED = 4.93 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS A1-11

JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS D (-1.5< DELTA T<=-0.5 C/100 M)

SEQUOYAH NUCLEAR PLANT APR 1, 2019 - JUN 30, 2019 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 0.642 0.367 0.321 0.046 0.000 0.000 0.000 1.375 NNE 0.000 0.046 1.696 0.733 0.642 0.458 0.000 0.000 0.000 3.575 NE 0.000 0.092 1.008 0.321 0.000 0.000 0.000 0.000 0.000 1.421 ENE 0.000 0.046 0.504 0.000 0.000 0.000 0.000 0.000 0.000 0.550 E 0.000 0.046 0.183 0.000 0.000 0.000 0.000 0.000 0.000 0.229 ESE 0.000 0.000 0.183 0.000 0.000 0.000 0.000 0.000 0.000 0.183 SE 0.000 0.000 0.367 0.046 0.000 0.000 0.000 0.000 0.000 0.412 SSE 0.000 0.000 0.596 0.367 0.046 0.000 0.000 0.000 0.000 1.008 S 0.000 0.092 1.100 1.787 0.596 0.550 0.000 0.000 0.000 4.125 SSW 0.000 0.137 2.979 3.896 1.054 0.229 0.000 0.000 0.000 8.295 SW 0.000 0.046 1.146 1.283 1.375 0.229 0.046 0.000 0.000 4.125 WSW 0.000 0.000 0.321 0.458 0.183 0.137 0.000 0.000 0.000 1.100 W 0.000 0.000 0.183 0.412 0.321 0.000 0.000 0.000 0.000 0.917 WNW 0.000 0.000 0.137 0.137 0.321 0.183 0.000 0.000 0.000 0.779 NW 0.000 0.046 0.092 0.412 0.183 0.092 0.000 0.000 0.000 0.825 NNW 0.000 0.000 0.229 0.321 0.367 0.137 0.000 0.000 0.000 1.054 SUBTOTAL 0.000 0.550 11.366 10.541 5.408 2.062 0.046 0.000 0.000 29.973 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2182 TOTAL HOURS OF STABILITY CLASS D 654 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS D 654 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2182 TOTAL HOURS CALM 0 METEOROLOGICAL FACILITY: SEQUOYAH NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 9.25 AND 45.99 METERS WIND SPEED AND DIRECTION MEASURED AT 9.73 METER LEVEL DATE PRINTED: 2019/08/09 MEAN WIND SPEED = 4.34 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS A1-12

JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS E (-0.5< DELTA T<= 1.5 C/100 M)

SEQUOYAH NUCLEAR PLANT APR 1, 2019 - JUN 30, 2019 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 0.504 2.016 0.458 0.275 0.000 0.000 0.000 0.000 3.254 NNE 0.000 0.642 3.162 1.100 0.092 0.000 0.000 0.000 0.000 4.995 NE 0.000 0.275 0.504 0.092 0.000 0.000 0.000 0.000 0.000 0.871 ENE 0.000 0.229 0.229 0.000 0.000 0.000 0.000 0.000 0.000 0.458 E 0.000 0.046 0.183 0.000 0.000 0.000 0.000 0.000 0.000 0.229 ESE 0.000 0.183 0.229 0.000 0.000 0.000 0.000 0.000 0.000 0.412 SE 0.000 0.229 0.092 0.000 0.000 0.000 0.000 0.000 0.000 0.321 SSE 0.000 0.275 0.779 0.412 0.092 0.092 0.000 0.000 0.000 1.650 S 0.000 0.550 1.146 0.779 0.504 0.642 0.000 0.000 0.000 3.621 SSW 0.000 0.458 3.941 1.467 0.321 0.046 0.000 0.000 0.000 6.233 SW 0.000 0.275 4.262 1.696 0.229 0.046 0.000 0.000 0.000 6.508 WSW 0.000 0.229 1.054 0.229 0.137 0.000 0.000 0.000 0.000 1.650 W 0.000 0.183 0.412 0.092 0.046 0.000 0.000 0.000 0.000 0.733 WNW 0.000 0.046 0.596 0.275 0.046 0.000 0.000 0.000 0.000 0.962 NW 0.000 0.046 0.825 0.183 0.046 0.000 0.000 0.000 0.000 1.100 NNW 0.000 0.275 0.733 0.550 0.000 0.000 0.000 0.000 0.000 1.558 SUBTOTAL 0.000 4.445 20.165 7.333 1.787 0.825 0.000 0.000 0.000 34.555 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2182 TOTAL HOURS OF STABILITY CLASS E 754 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS E 754 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2182 TOTAL HOURS CALM 0 METEOROLOGICAL FACILITY: SEQUOYAH NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 9.25 AND 45.99 METERS WIND SPEED AND DIRECTION MEASURED AT 9.73 METER LEVEL DATE PRINTED: 2019/08/09 MEAN WIND SPEED = 2.98 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS A1-13

JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS F ( 1.5< DELTA T<= 4.0 C/100 M)

SEQUOYAH NUCLEAR PLANT APR 1, 2019 - JUN 30, 2019 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 0.367 1.696 0.137 0.000 0.000 0.000 0.000 0.000 2.200 NNE 0.000 0.962 2.475 0.000 0.000 0.000 0.000 0.000 0.000 3.437 NE 0.000 0.458 0.321 0.000 0.000 0.000 0.000 0.000 0.000 0.779 ENE 0.000 0.275 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.275 E 0.000 0.183 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.183 ESE 0.000 0.046 0.046 0.000 0.000 0.000 0.000 0.000 0.000 0.092 SE 0.000 0.458 0.092 0.000 0.000 0.000 0.000 0.000 0.000 0.550 SSE 0.000 0.504 0.137 0.000 0.000 0.000 0.000 0.000 0.000 0.642 S 0.000 0.687 0.550 0.000 0.000 0.000 0.000 0.000 0.000 1.237 SSW 0.000 0.321 1.421 0.092 0.000 0.000 0.000 0.000 0.000 1.833 SW 0.000 0.092 0.917 0.000 0.000 0.000 0.000 0.000 0.000 1.008 WSW 0.000 0.092 0.367 0.046 0.000 0.000 0.000 0.000 0.000 0.504 W 0.000 0.000 0.137 0.000 0.000 0.000 0.000 0.000 0.000 0.137 WNW 0.000 0.046 0.046 0.000 0.000 0.000 0.000 0.000 0.000 0.092 NW 0.000 0.092 0.046 0.000 0.000 0.000 0.000 0.000 0.000 0.137 NNW 0.000 0.092 0.367 0.000 0.046 0.000 0.000 0.000 0.000 0.504 SUBTOTAL 0.000 4.675 8.616 0.275 0.046 0.000 0.000 0.000 0.000 13.611 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2182 TOTAL HOURS OF STABILITY CLASS F 297 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS F 297 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2182 TOTAL HOURS CALM 0 METEOROLOGICAL FACILITY: SEQUOYAH NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 9.25 AND 45.99 METERS WIND SPEED AND DIRECTION MEASURED AT 9.73 METER LEVEL DATE PRINTED: 2019/08/09 MEAN WIND SPEED = 1.83 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS A1-14

JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS G (DELTA T > 4.0 C/100 M)

SEQUOYAH NUCLEAR PLANT APR 1, 2019 - JUN 30, 2019 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 0.092 0.137 0.000 0.000 0.000 0.000 0.000 0.000 0.229 NNE 0.000 0.183 0.871 0.046 0.000 0.000 0.000 0.000 0.000 1.100 NE 0.000 0.183 0.321 0.000 0.000 0.000 0.000 0.000 0.000 0.504 ENE 0.000 0.229 0.046 0.000 0.000 0.000 0.000 0.000 0.000 0.275 E 0.000 0.137 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.137 ESE 0.000 0.046 0.092 0.000 0.000 0.000 0.000 0.000 0.000 0.137 SE 0.000 0.137 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.137 SSE 0.000 0.504 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.504 S 0.000 0.183 0.367 0.000 0.000 0.000 0.000 0.000 0.000 0.550 SSW 0.000 0.137 0.642 0.000 0.000 0.000 0.000 0.000 0.000 0.779 SW 0.000 0.000 0.504 0.000 0.000 0.000 0.000 0.000 0.000 0.504 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 1.833 2.979 0.046 0.000 0.000 0.000 0.000 0.000 4.858 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2182 TOTAL HOURS OF STABILITY CLASS G 106 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS G 106 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2182 TOTAL HOURS CALM 0 METEOROLOGICAL FACILITY: SEQUOYAH NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 9.25 AND 45.99 METERS WIND SPEED AND DIRECTION MEASURED AT 9.73 METER LEVEL DATE PRINTED: 2019/08/09 MEAN WIND SPEED = 1.69 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS A1-15

JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS A (DELTA T<=-1.9 C/100 M)

SEQUOYAH NUCLEAR PLANT STA 57 A - Validated Edited Data JUL 1, 2019 - SEP 30, 2019 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 0.182 0.454 0.136 0.000 0.000 0.000 0.772 NNE 0.000 0.000 0.000 1.817 0.727 0.045 0.000 0.000 0.000 2.590 NE 0.000 0.000 0.182 1.318 0.136 0.000 0.000 0.000 0.000 1.636 ENE 0.000 0.000 0.182 0.227 0.000 0.000 0.000 0.000 0.000 0.409 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 0.045 0.273 0.000 0.000 0.000 0.000 0.000 0.318 SSE 0.000 0.000 0.000 0.091 0.045 0.000 0.000 0.000 0.000 0.136 S 0.000 0.000 0.000 0.182 0.409 0.136 0.000 0.000 0.000 0.727 SSW 0.000 0.000 0.091 1.363 1.090 0.045 0.000 0.000 0.000 2.590 SW 0.000 0.000 0.045 1.408 0.636 0.000 0.000 0.000 0.000 2.090 WSW 0.000 0.000 0.000 0.227 0.045 0.000 0.000 0.000 0.000 0.273 W 0.000 0.000 0.045 0.000 0.000 0.000 0.000 0.000 0.000 0.045 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 0.045 0.000 0.000 0.000 0.000 0.091 NNW 0.000 0.000 0.000 0.182 0.045 0.000 0.000 0.000 0.000 0.227 SUBTOTAL 0.000 0.000 0.591 7.315 3.635 0.363 0.000 0.000 0.000 11.904 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2201 TOTAL HOURS OF STABILITY CLASS A 262 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS A 262 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2201 TOTAL HOURS CALM 0 METEOROLOGICAL FACILITY: SEQUOYAH NUCLEAR PLANT STA 57 A - Validated Edited Data STABILITY BASED ON DELTA-T BETWEEN 9.25 AND 45.99 METERS WIND SPEED AND DIRECTION MEASURED AT 9.73 METER LEVEL DATE PRINTED: 2019/10/29 MEAN WIND SPEED = 5.09 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS A1-16

JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS B (-1.9< DELTA T<=-1.7 C/100 M)

SEQUOYAH NUCLEAR PLANT STA 57 A - Validated Edited Data JUL 1, 2019 - SEP 30, 2019 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 0.045 0.091 0.136 0.045 0.000 0.000 0.000 0.318 NNE 0.000 0.000 0.182 0.727 0.091 0.091 0.000 0.000 0.000 1.090 NE 0.000 0.000 0.772 0.318 0.000 0.000 0.000 0.000 0.000 1.090 ENE 0.000 0.000 0.091 0.045 0.000 0.000 0.000 0.000 0.000 0.136 E 0.000 0.000 0.136 0.000 0.000 0.000 0.000 0.000 0.000 0.136 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 0.091 0.000 0.000 0.000 0.000 0.000 0.091 SSE 0.000 0.000 0.045 0.091 0.000 0.000 0.000 0.000 0.000 0.136 S 0.000 0.000 0.000 0.682 0.136 0.000 0.000 0.000 0.000 0.818 SSW 0.000 0.000 0.182 1.590 0.545 0.000 0.000 0.000 0.000 2.317 SW 0.000 0.000 0.136 0.318 0.045 0.000 0.000 0.000 0.000 0.500 WSW 0.000 0.000 0.000 0.045 0.000 0.000 0.000 0.000 0.000 0.045 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 0.045 0.000 0.000 0.000 0.000 0.000 0.000 0.045 NW 0.000 0.000 0.000 0.091 0.000 0.000 0.000 0.000 0.000 0.091 NNW 0.000 0.000 0.000 0.000 0.091 0.000 0.000 0.000 0.000 0.091 SUBTOTAL 0.000 0.000 1.636 4.089 1.045 0.136 0.000 0.000 0.000 6.906 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2201 TOTAL HOURS OF STABILITY CLASS B 152 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS B 152 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2201 TOTAL HOURS CALM 0 METEOROLOGICAL FACILITY: SEQUOYAH NUCLEAR PLANT STA 57 A - Validated Edited Data STABILITY BASED ON DELTA-T BETWEEN 9.25 AND 45.99 METERS WIND SPEED AND DIRECTION MEASURED AT 9.73 METER LEVEL DATE PRINTED: 2019/10/29 MEAN WIND SPEED = 4.36 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS A1-17

JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS C (-1.7< DELTA T<=-1.5 C/100 M)

SEQUOYAH NUCLEAR PLANT STA 57 A - Validated Edited Data JUL 1, 2019 - SEP 30, 2019 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 0.182 0.136 0.000 0.000 0.000 0.000 0.318 NNE 0.000 0.000 0.182 0.454 0.045 0.136 0.000 0.000 0.000 0.818 NE 0.000 0.000 0.500 0.227 0.000 0.000 0.000 0.000 0.000 0.727 ENE 0.000 0.000 0.227 0.000 0.000 0.000 0.000 0.000 0.000 0.227 E 0.000 0.000 0.227 0.045 0.000 0.000 0.000 0.000 0.000 0.273 ESE 0.000 0.000 0.227 0.000 0.000 0.000 0.000 0.000 0.000 0.227 SE 0.000 0.000 0.091 0.000 0.000 0.000 0.000 0.000 0.000 0.091 SSE 0.000 0.000 0.091 0.091 0.000 0.000 0.000 0.000 0.000 0.182 S 0.000 0.000 0.454 0.500 0.000 0.000 0.000 0.000 0.000 0.954 SSW 0.000 0.000 0.682 1.454 0.136 0.000 0.000 0.000 0.000 2.272 SW 0.000 0.000 0.182 0.182 0.000 0.000 0.000 0.000 0.000 0.363 WSW 0.000 0.000 0.000 0.136 0.000 0.000 0.000 0.000 0.000 0.136 W 0.000 0.000 0.045 0.000 0.000 0.000 0.000 0.000 0.000 0.045 WNW 0.000 0.000 0.000 0.091 0.000 0.000 0.000 0.000 0.000 0.091 NW 0.000 0.000 0.045 0.045 0.045 0.045 0.000 0.000 0.000 0.182 NNW 0.000 0.000 0.045 0.045 0.091 0.000 0.000 0.000 0.000 0.182 SUBTOTAL 0.000 0.000 2.999 3.453 0.454 0.182 0.000 0.000 0.000 7.088 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2201 TOTAL HOURS OF STABILITY CLASS C 156 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS C 156 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2201 TOTAL HOURS CALM 0 METEOROLOGICAL FACILITY: SEQUOYAH NUCLEAR PLANT STA 57 A - Validated Edited Data STABILITY BASED ON DELTA-T BETWEEN 9.25 AND 45.99 METERS WIND SPEED AND DIRECTION MEASURED AT 9.73 METER LEVEL DATE PRINTED: 2019/10/29 MEAN WIND SPEED = 3.88 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS A1-18

JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS D (-1.5< DELTA T<=-0.5 C/100 M)

SEQUOYAH NUCLEAR PLANT STA 57 A - Validated Edited Data JUL 1, 2019 - SEP 30, 2019 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 0.091 1.590 0.727 0.500 0.091 0.000 0.000 0.000 2.999 NNE 0.000 0.182 2.090 1.545 0.409 0.000 0.000 0.000 0.000 4.225 NE 0.000 0.000 0.863 0.227 0.000 0.000 0.000 0.000 0.000 1.090 ENE 0.000 0.091 0.318 0.000 0.000 0.000 0.000 0.000 0.000 0.409 E 0.000 0.000 0.091 0.045 0.000 0.000 0.000 0.000 0.000 0.136 ESE 0.000 0.091 0.318 0.091 0.000 0.000 0.000 0.000 0.000 0.500 SE 0.000 0.045 0.363 0.091 0.000 0.000 0.000 0.000 0.000 0.500 SSE 0.000 0.136 0.636 0.227 0.000 0.000 0.000 0.000 0.000 1.000 S 0.000 0.000 2.135 1.136 0.454 0.000 0.000 0.000 0.000 3.726 SSW 0.000 0.091 2.681 2.953 0.363 0.045 0.000 0.000 0.000 6.134 SW 0.000 0.045 1.045 1.045 0.136 0.000 0.000 0.000 0.000 2.272 WSW 0.000 0.000 0.273 0.273 0.045 0.000 0.000 0.000 0.000 0.591 W 0.000 0.045 0.273 0.227 0.000 0.000 0.000 0.000 0.000 0.545 WNW 0.000 0.000 0.136 0.227 0.000 0.000 0.000 0.000 0.000 0.363 NW 0.000 0.136 0.182 0.182 0.000 0.000 0.000 0.000 0.000 0.500 NNW 0.000 0.000 0.091 0.227 0.091 0.000 0.000 0.000 0.000 0.409 SUBTOTAL 0.000 0.954 13.085 9.223 1.999 0.136 0.000 0.000 0.000 25.398 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2201 TOTAL HOURS OF STABILITY CLASS D 559 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS D 559 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2201 TOTAL HOURS CALM 0 METEOROLOGICAL FACILITY: SEQUOYAH NUCLEAR PLANT STA 57 A - Validated Edited Data STABILITY BASED ON DELTA-T BETWEEN 9.25 AND 45.99 METERS WIND SPEED AND DIRECTION MEASURED AT 9.73 METER LEVEL DATE PRINTED: 2019/10/29 MEAN WIND SPEED = 3.40 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS A1-19

JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS E (-0.5< DELTA T<= 1.5 C/100 M)

SEQUOYAH NUCLEAR PLANT STA 57 A - Validated Edited Data JUL 1, 2019 - SEP 30, 2019 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 0.954 5.588 0.636 0.091 0.000 0.000 0.000 0.000 7.269 NNE 0.000 1.272 3.907 0.500 0.000 0.045 0.000 0.000 0.000 5.725 NE 0.000 0.363 0.273 0.000 0.000 0.000 0.000 0.000 0.000 0.636 ENE 0.000 0.091 0.045 0.000 0.000 0.000 0.000 0.000 0.000 0.136 E 0.000 0.091 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.091 ESE 0.000 0.227 0.182 0.000 0.000 0.000 0.000 0.000 0.000 0.409 SE 0.000 0.091 0.136 0.000 0.000 0.000 0.000 0.000 0.000 0.227 SSE 0.000 0.091 0.682 0.045 0.000 0.000 0.000 0.000 0.000 0.818 S 0.000 0.500 1.499 0.045 0.000 0.000 0.000 0.000 0.000 2.045 SSW 0.000 0.363 2.363 0.182 0.000 0.000 0.000 0.000 0.000 2.908 SW 0.000 0.318 2.635 0.818 0.000 0.000 0.000 0.000 0.000 3.771 WSW 0.000 0.318 1.545 0.136 0.000 0.000 0.000 0.000 0.000 1.999 W 0.000 0.318 0.363 0.045 0.000 0.000 0.000 0.000 0.000 0.727 WNW 0.000 0.136 0.545 0.000 0.000 0.000 0.000 0.000 0.000 0.682 NW 0.000 0.136 0.682 0.045 0.000 0.000 0.000 0.000 0.000 0.863 NNW 0.000 0.500 2.317 0.545 0.000 0.000 0.000 0.000 0.000 3.362 SUBTOTAL 0.000 5.770 22.762 2.999 0.091 0.045 0.000 0.000 0.000 31.667 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2201 TOTAL HOURS OF STABILITY CLASS E 697 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS E 697 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2201 TOTAL HOURS CALM 0 METEOROLOGICAL FACILITY: SEQUOYAH NUCLEAR PLANT STA 57 A - Validated Edited Data STABILITY BASED ON DELTA-T BETWEEN 9.25 AND 45.99 METERS WIND SPEED AND DIRECTION MEASURED AT 9.73 METER LEVEL DATE PRINTED: 2019/10/29 MEAN WIND SPEED = 2.18 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS A1-20

JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS F ( 1.5< DELTA T<= 4.0 C/100 M)

SEQUOYAH NUCLEAR PLANT STA 57 A - Validated Edited Data JUL 1, 2019 - SEP 30, 2019 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 0.409 3.862 0.045 0.000 0.000 0.000 0.000 0.000 4.316 NNE 0.000 1.636 5.679 0.000 0.000 0.000 0.000 0.000 0.000 7.315 NE 0.000 0.591 0.227 0.000 0.000 0.000 0.000 0.000 0.000 0.818 ENE 0.000 0.318 0.045 0.000 0.000 0.000 0.000 0.000 0.000 0.363 E 0.000 0.227 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.227 ESE 0.000 0.227 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.227 SE 0.000 0.227 0.091 0.000 0.000 0.000 0.000 0.000 0.000 0.318 SSE 0.000 0.273 0.136 0.000 0.000 0.000 0.000 0.000 0.000 0.409 S 0.000 0.136 0.273 0.045 0.000 0.000 0.000 0.000 0.000 0.454 SSW 0.000 0.227 0.227 0.000 0.000 0.000 0.000 0.000 0.000 0.454 SW 0.000 0.182 0.227 0.000 0.000 0.000 0.000 0.000 0.000 0.409 WSW 0.000 0.000 0.136 0.000 0.000 0.000 0.000 0.000 0.000 0.136 W 0.000 0.000 0.091 0.000 0.000 0.000 0.000 0.000 0.000 0.091 WNW 0.000 0.000 0.045 0.000 0.000 0.000 0.000 0.000 0.000 0.045 NW 0.000 0.000 0.136 0.000 0.000 0.000 0.000 0.000 0.000 0.136 NNW 0.000 0.136 0.591 0.000 0.000 0.000 0.000 0.000 0.000 0.727 SUBTOTAL 0.000 4.589 11.767 0.091 0.000 0.000 0.000 0.000 0.000 16.447 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2201 TOTAL HOURS OF STABILITY CLASS F 362 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS F 362 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2201 TOTAL HOURS CALM 0 METEOROLOGICAL FACILITY: SEQUOYAH NUCLEAR PLANT STA 57 A - Validated Edited Data STABILITY BASED ON DELTA-T BETWEEN 9.25 AND 45.99 METERS WIND SPEED AND DIRECTION MEASURED AT 9.73 METER LEVEL DATE PRINTED: 2019/10/29 MEAN WIND SPEED = 1.77 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS A1-21

JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS G (DELTA T > 4.0 C/100 M)

SEQUOYAH NUCLEAR PLANT STA 57 A - Validated Edited Data JUL 1, 2019 - SEP 30, 2019 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 0.136 0.000 0.000 0.000 0.000 0.000 0.000 0.182 NE 0.000 0.000 0.091 0.000 0.000 0.000 0.000 0.000 0.000 0.091 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 0.045 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.045 SSE 0.000 0.182 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.182 S 0.000 0.000 0.091 0.000 0.000 0.000 0.000 0.000 0.000 0.091 SSW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 SW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 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 0.273 0.318 0.000 0.000 0.000 0.000 0.000 0.000 0.591 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2201 TOTAL HOURS OF STABILITY CLASS G 13 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS G 13 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2201 TOTAL HOURS CALM 0 METEOROLOGICAL FACILITY: SEQUOYAH NUCLEAR PLANT STA 57 A - Validated Edited Data STABILITY BASED ON DELTA-T BETWEEN 9.25 AND 45.99 METERS WIND SPEED AND DIRECTION MEASURED AT 9.73 METER LEVEL DATE PRINTED: 2019/10/29 MEAN WIND SPEED = 1.48 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS A1-22

JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS A (DELTA T<=-1.9 C/100 M)

SEQUOYAH NUCLEAR PLANT OCT 1, 2019 - DEC 31, 2019 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 0.230 0.046 0.000 0.000 0.000 0.000 0.276 NNE 0.000 0.000 0.046 0.506 0.506 0.414 0.000 0.000 0.000 1.471 NE 0.000 0.000 0.184 0.414 0.230 0.046 0.000 0.000 0.000 0.874 ENE 0.000 0.000 0.000 0.322 0.000 0.000 0.000 0.000 0.000 0.322 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 0.046 0.000 0.000 0.000 0.000 0.000 0.046 SE 0.000 0.000 0.000 0.092 0.000 0.000 0.000 0.000 0.000 0.092 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 0.046 0.046 0.184 0.000 0.000 0.000 0.276 SSW 0.000 0.000 0.000 0.230 0.322 0.092 0.000 0.000 0.000 0.644 SW 0.000 0.000 0.000 0.414 0.276 0.138 0.000 0.000 0.000 0.828 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 0.046 0.046 0.000 0.000 0.000 0.092 SUBTOTAL 0.000 0.000 0.230 2.345 1.471 0.920 0.000 0.000 0.000 4.966 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2189 TOTAL HOURS OF STABILITY CLASS A 108 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS A 108 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2175 TOTAL HOURS CALM 0 METEOROLOGICAL FACILITY: SEQUOYAH NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 9.25 AND 45.99 METERS WIND SPEED AND DIRECTION MEASURED AT 9.73 METER LEVEL DATE PRINTED: 2020/01/23 MEAN WIND SPEED = 5.74 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS A1-23

JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS B (-1.9< DELTA T<=-1.7 C/100 M)

SEQUOYAH NUCLEAR PLANT OCT 1, 2019 - DEC 31, 2019 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 0.138 0.046 0.460 0.230 0.000 0.000 0.000 0.874 NE 0.000 0.000 0.230 0.368 0.046 0.046 0.000 0.000 0.000 0.690 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 0.092 0.046 0.000 0.000 0.000 0.000 0.000 0.138 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 0.046 0.000 0.000 0.000 0.000 0.000 0.046 SSE 0.000 0.000 0.000 0.092 0.000 0.000 0.000 0.000 0.000 0.092 S 0.000 0.000 0.000 0.092 0.046 0.046 0.000 0.000 0.000 0.184 SSW 0.000 0.000 0.046 0.184 0.322 0.046 0.000 0.000 0.000 0.598 SW 0.000 0.000 0.000 0.230 0.092 0.276 0.000 0.000 0.000 0.598 WSW 0.000 0.000 0.000 0.046 0.046 0.092 0.000 0.000 0.000 0.184 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 0.046 0.092 0.000 0.000 0.000 0.138 SUBTOTAL 0.000 0.000 0.506 1.195 1.103 0.828 0.000 0.000 0.000 3.632 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2189 TOTAL HOURS OF STABILITY CLASS B 79 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS B 79 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2175 TOTAL HOURS CALM 0 METEOROLOGICAL FACILITY: SEQUOYAH NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 9.25 AND 45.99 METERS WIND SPEED AND DIRECTION MEASURED AT 9.73 METER LEVEL DATE PRINTED: 2020/01/23 MEAN WIND SPEED = 5.77 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS A1-24

JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS C (-1.7< DELTA T<=-1.5 C/100 M)

SEQUOYAH NUCLEAR PLANT OCT 1, 2019 - DEC 31, 2019 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 0.092 0.138 0.000 0.000 0.000 0.322 NNE 0.000 0.000 0.368 0.460 0.184 0.230 0.000 0.000 0.000 1.241 NE 0.000 0.000 0.046 0.230 0.092 0.046 0.000 0.000 0.000 0.414 ENE 0.000 0.000 0.138 0.000 0.000 0.000 0.000 0.000 0.000 0.138 E 0.000 0.000 0.092 0.000 0.000 0.000 0.000 0.000 0.000 0.092 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 0.322 0.000 0.000 0.000 0.000 0.000 0.322 SSW 0.000 0.000 0.000 0.460 0.276 0.000 0.000 0.000 0.000 0.736 SW 0.000 0.000 0.138 0.598 0.000 0.046 0.000 0.000 0.000 0.782 WSW 0.000 0.000 0.046 0.000 0.000 0.046 0.000 0.000 0.000 0.092 W 0.000 0.000 0.000 0.046 0.000 0.000 0.000 0.000 0.000 0.046 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 0.000 0.138 0.230 0.000 0.000 0.000 0.368 SUBTOTAL 0.000 0.000 0.828 2.253 0.782 0.782 0.000 0.000 0.000 4.644 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2189 TOTAL HOURS OF STABILITY CLASS C 102 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS C 101 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2175 TOTAL HOURS CALM 0 METEOROLOGICAL FACILITY: SEQUOYAH NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 9.25 AND 45.99 METERS WIND SPEED AND DIRECTION MEASURED AT 9.73 METER LEVEL DATE PRINTED: 2020/01/23 MEAN WIND SPEED = 5.13 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS A1-25

JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS D (-1.5< DELTA T<=-0.5 C/100 M)

SEQUOYAH NUCLEAR PLANT OCT 1, 2019 - DEC 31, 2019 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 0.092 1.195 1.333 1.747 1.195 0.000 0.000 0.000 5.563 NNE 0.000 0.000 1.839 2.345 2.897 1.563 0.000 0.000 0.000 8.644 NE 0.000 0.138 1.103 0.322 0.230 0.000 0.000 0.000 0.000 1.793 ENE 0.000 0.092 0.276 0.046 0.000 0.000 0.000 0.000 0.000 0.414 E 0.000 0.000 0.276 0.000 0.000 0.000 0.000 0.000 0.000 0.276 ESE 0.000 0.000 0.046 0.000 0.000 0.000 0.000 0.000 0.000 0.046 SE 0.000 0.000 0.046 0.000 0.000 0.000 0.000 0.000 0.000 0.046 SSE 0.000 0.000 0.276 0.046 0.000 0.184 0.000 0.000 0.000 0.506 S 0.000 0.000 0.782 0.690 0.414 0.414 0.046 0.000 0.000 2.345 SSW 0.000 0.138 1.701 1.885 1.011 0.368 0.000 0.000 0.000 5.103 SW 0.000 0.046 0.920 0.920 0.184 0.230 0.000 0.000 0.000 2.299 WSW 0.000 0.046 0.552 0.230 0.276 0.046 0.000 0.000 0.000 1.149 W 0.000 0.046 0.138 0.230 0.552 0.368 0.046 0.000 0.000 1.379 WNW 0.000 0.000 0.230 0.184 0.276 0.552 0.000 0.000 0.000 1.241 NW 0.000 0.046 0.368 0.322 0.460 0.322 0.000 0.000 0.000 1.517 NNW 0.000 0.046 0.184 0.736 0.598 0.460 0.000 0.000 0.000 2.023 SUBTOTAL 0.000 0.690 9.931 9.287 8.644 5.701 0.092 0.000 0.000 34.345 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2189 TOTAL HOURS OF STABILITY CLASS D 748 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS D 747 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2175 TOTAL HOURS CALM 0 METEOROLOGICAL FACILITY: SEQUOYAH NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 9.25 AND 45.99 METERS WIND SPEED AND DIRECTION MEASURED AT 9.73 METER LEVEL DATE PRINTED: 2020/01/23 MEAN WIND SPEED = 5.01 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS A1-26

JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS E (-0.5< DELTA T<= 1.5 C/100 M)

SEQUOYAH NUCLEAR PLANT OCT 1, 2019 - DEC 31, 2019 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 0.414 2.483 1.839 0.184 0.000 0.000 0.000 0.000 4.920 NNE 0.000 0.506 3.034 1.839 0.644 0.690 0.000 0.000 0.000 6.713 NE 0.000 0.368 0.552 0.092 0.046 0.000 0.000 0.000 0.000 1.057 ENE 0.000 0.184 0.368 0.000 0.000 0.000 0.000 0.000 0.000 0.552 E 0.000 0.138 0.092 0.000 0.000 0.000 0.000 0.000 0.000 0.230 ESE 0.000 0.184 0.092 0.000 0.000 0.000 0.000 0.000 0.000 0.276 SE 0.000 0.092 0.230 0.000 0.000 0.000 0.000 0.000 0.000 0.322 SSE 0.000 0.184 0.276 0.092 0.000 0.092 0.000 0.000 0.000 0.644 S 0.000 0.138 1.149 0.552 0.644 0.736 0.000 0.000 0.000 3.218 SSW 0.000 0.368 2.713 1.379 0.322 0.046 0.046 0.000 0.000 4.874 SW 0.000 0.276 2.805 0.966 0.092 0.000 0.000 0.000 0.000 4.138 WSW 0.000 0.184 0.782 0.644 0.276 0.138 0.000 0.000 0.000 2.023 W 0.000 0.184 0.184 0.276 0.184 0.092 0.000 0.000 0.000 0.920 WNW 0.000 0.092 0.322 0.276 0.092 0.046 0.000 0.000 0.000 0.828 NW 0.000 0.138 0.138 0.414 0.046 0.046 0.000 0.000 0.000 0.782 NNW 0.000 0.276 1.011 0.414 0.092 0.000 0.000 0.000 0.000 1.793 SUBTOTAL 0.000 3.724 16.230 8.782 2.621 1.885 0.046 0.000 0.000 33.287 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2189 TOTAL HOURS OF STABILITY CLASS E 725 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS E 724 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2175 TOTAL HOURS CALM 0 METEOROLOGICAL FACILITY: SEQUOYAH NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 9.25 AND 45.99 METERS WIND SPEED AND DIRECTION MEASURED AT 9.73 METER LEVEL DATE PRINTED: 2020/01/23 MEAN WIND SPEED = 3.43 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS A1-27

JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS F ( 1.5< DELTA T<= 4.0 C/100 M)

SEQUOYAH NUCLEAR PLANT OCT 1, 2019 - DEC 31, 2019 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 0.010 0.552 2.621 0.184 0.000 0.000 0.000 0.000 0.000 3.366 NNE 0.018 0.920 4.828 0.276 0.000 0.000 0.000 0.000 0.000 6.041 NE 0.005 0.644 0.920 0.092 0.000 0.000 0.000 0.000 0.000 1.660 ENE 0.001 0.184 0.046 0.000 0.000 0.000 0.000 0.000 0.000 0.231 E 0.000 0.046 0.046 0.000 0.000 0.000 0.000 0.000 0.000 0.092 ESE 0.001 0.230 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.231 SE 0.000 0.092 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.092 SSE 0.001 0.184 0.092 0.000 0.000 0.000 0.000 0.000 0.000 0.277 S 0.002 0.414 0.368 0.000 0.000 0.000 0.000 0.000 0.000 0.784 SSW 0.003 0.276 0.736 0.046 0.092 0.000 0.000 0.000 0.000 1.153 SW 0.002 0.092 0.552 0.000 0.000 0.000 0.000 0.000 0.000 0.646 WSW 0.000 0.046 0.000 0.046 0.000 0.046 0.000 0.000 0.000 0.138 W 0.000 0.046 0.046 0.092 0.000 0.000 0.000 0.000 0.000 0.184 WNW 0.000 0.046 0.046 0.000 0.000 0.000 0.000 0.000 0.000 0.092 NW 0.001 0.092 0.184 0.046 0.000 0.000 0.000 0.000 0.000 0.323 NNW 0.002 0.184 0.322 0.000 0.046 0.000 0.000 0.000 0.000 0.553 SUBTOTAL 0.046 4.046 10.805 0.782 0.138 0.046 0.000 0.000 0.000 15.862 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2189 TOTAL HOURS OF STABILITY CLASS F 355 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS F 345 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2175 TOTAL HOURS CALM 1 METEOROLOGICAL FACILITY: SEQUOYAH NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 9.25 AND 45.99 METERS WIND SPEED AND DIRECTION MEASURED AT 9.73 METER LEVEL DATE PRINTED: 2020/01/23 MEAN WIND SPEED = 2.01 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS A1-28

JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS G (DELTA T > 4.0 C/100 M)

SEQUOYAH NUCLEAR PLANT OCT 1, 2019 - DEC 31, 2019 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 0.046 0.000 0.000 0.000 0.000 0.000 0.000 0.092 NNE 0.000 0.230 0.460 0.138 0.000 0.000 0.000 0.000 0.000 0.828 NE 0.000 0.092 0.414 0.046 0.000 0.000 0.000 0.000 0.000 0.552 ENE 0.000 0.276 0.046 0.000 0.000 0.000 0.000 0.000 0.000 0.322 E 0.000 0.138 0.092 0.000 0.000 0.000 0.000 0.000 0.000 0.230 ESE 0.000 0.046 0.000 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 0.138 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.138 S 0.000 0.092 0.046 0.000 0.000 0.000 0.000 0.000 0.000 0.138 SSW 0.000 0.138 0.230 0.000 0.000 0.000 0.000 0.000 0.000 0.368 SW 0.000 0.046 0.046 0.000 0.000 0.000 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 0.046 0.046 0.000 0.000 0.000 0.000 0.000 0.000 0.092 WNW 0.000 0.000 0.092 0.000 0.000 0.000 0.000 0.000 0.000 0.092 NW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 NNW 0.000 0.092 0.092 0.000 0.000 0.000 0.000 0.000 0.000 0.184 SUBTOTAL 0.000 1.425 1.655 0.184 0.000 0.000 0.000 0.000 0.000 3.264 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2189 TOTAL HOURS OF STABILITY CLASS G 72 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS G 71 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2175 TOTAL HOURS CALM 0 METEOROLOGICAL FACILITY: SEQUOYAH NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 9.25 AND 45.99 METERS WIND SPEED AND DIRECTION MEASURED AT 9.73 METER LEVEL DATE PRINTED: 2020/01/23 MEAN WIND SPEED = 1.80 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBER A1-29

Attachment 2 Deviations from ODCM Controls/Surveillance Requirements No Deviations in Calandar Year 2019 A2-1

Attachment 3 Radiation Monitors Non Functional for Greater than 30 days Date Description of Non Functionality June 20, 2016 Unit 2 Shield Building Exhaust Radiation Monitor: 2-RM-90-400 has been non-functional for greater than 30 days due to DCN D23440. The monitor was declared non-functional 6/20/16 at 09:20 and is currently still non functional due to complications with DCN D23440. Compensatory sampling has been in place and will continue until monitor is returned to functional status.

June 25, 2016 Unit 1 Shield Building Exhaust Radiation Monitor:1-RM-90-400 has been non-functional for greater than 30 days due to DCN D23440. The monitor was declared non-functional 6/25/16 at 14:17 and is currently still non functional due to complications with DCN D23440. Compensatory sampling has been in place and will continue until monitor is returned to functional status.

A3-1

Attachment 4 Errata/Corrections to Previous ARERRs The subsequent addendums document changes to previous ARERRs from the years 2018, 2017 and 2016. The changes are a result of a procedure error that allowed for incorrect flow values to be used for the monthly shield building exhaust permits. In the third quarter of 2016, flow elements were replaced in the U1 and U2 SBVMS (Shield Building Vent Monitoring System) as part of a design change to address system aging issues. During post installation testing on U1, it was discovered that the new flow sensors could not meet system accuracy requirements during periods of low flow and the SBVMS was never returned to service. Based on the U1 test results, the U2 SBVMS was also declared non-functional.

During normal operation, the SBVMS provides U1 and U2 Shield Building ventilation flow rates to the plant computer system. Chemistry personnel use this data point to calculate the quantity of radioactive effluents released from the plant for determining doses to the public.

Although the SBVMS was out of service, the flow sensors were still providing erroneous data to ICS and the computer data point was still available. The procedure available provided an opportunity to calculate the flows using the erroneous data and that method continued to be used until June 10, 2019, when, following a software upgrade to ICS, personnel noticed significant errors in the data provided and the licensee realized that information from a non-functional system was being used.

The affected release permits were reprocessed with the appropriate compensatory flows, doses recalculated, and appropriate changes made to the affected ARERRs. The recalculated differences were for tritium only. Released values for 2018, 2017 and 2016 differed by 1%, 2%

and 1.5% respectively. Total Body and Thyroid Dose reported for 2018 and 2017 remained unchanged from previous values. Thyroid Dose for 2016 decreased from 7.15E-01 mrem to 7.13E-01 mrem for the calendar year.

The following addendums address the use of erroneous data and correct tables that required corrections. The pages of the reports requiring updates are included in their entirety.

Associated Condition Reports: 1561202, 1524521, and 1546981.

A4-1

Addendum 1 Errata/Corrections to Previous ARERRs: 2018 ARERR A4-2

Gaseous Effluents - Summation of Releases During the Period Starting: 1-Jan-2018 Ending: 30-Jun-2018 Type of Effluent Units Quarter 1 Quarter 2 Estimated Total Error A. Fission and Activation Products

1. Total Release Ci 2.82E-01 9.21E-01 11%

2. Average Release Rate For Period µCi/sec 3.63E-02 1.17E-01

3. Percent of Applicable Limit  % *

• B. Radioiodines

1. Total Iodine-131 Ci 0.00E+01** 0.00E+01 N/A***

2. Average Release Rate For Period µCi/sec 0.00E+01 0.00E+01

3. Percent of Applicable Limit  % *

• C. Particulates

1. Particulates (Half-Lives > 8 Days) Ci 0.00E+01 0.00E+01 N/A

2. Average Release Rate For Period µCi/sec 0.00E+01 0.00E+01

3. Percent of Applicable Limit  % * *

4. Gross Alpha Radioactivity Ci 0.00E+01 0.00E+01 D. Tritium

1. Total Release Ci 1.80E+00 3.17E+00 15%

2. Average Release Rate For Period µCi/sec 2.32E-01 4.04E-01

3. Percent of Applicable Limit  % *

• E. Carbon-14

1. Total Release Ci 5.61E+00 5.40E+00 N/A

2. Average Release Rate For Period µCi/sec 7.22E-01 6.87E-01

3. Percent of Applicable Limit  % * *

• Applicable Limits are expressed in terms of dose. See Tables 1-4 of the 2018 Radiological Impact Assessment Report.

• • Zeroes indicate that no radioactivity was present at detectable levels.

• • • N/A - Errors in measurement are not reported for these values since none were identified during the reporting period.

A4-3

Gaseous Effluents - Summation of Releases During the Period Starting: 1-Jul-2018 Ending: 31-Dec-2018 Type of Effluent Units Quarter 3 Quarter 4 Estimated Total Error %

A. Fission and Activation Products

1. Total Release Ci 1.05E+00 2.12E+00 11%

2. Average Release Rate For Period µCi/sec 1.32E-01 2.67E-01

3. Percent of Applicable Limit  % *

• B. Radioiodines

1. Total Iodine-131 Ci 0.00E+01** 0.00E+01 N/A***

2. Average Release Rate For Period µCi/sec 0.00E+01 0.00E+01

3. Percent of Applicable Limit  % *

• C. Particulates

1. Particulates (Half-Lives > 8 Days) Ci 0.00E+01 0.00E+01 16%

2. Average Release Rate For Period µCi/sec 0.00E+01 0.00E+01

3. Percent of Applicable Limit  % * *

4. Gross Alpha Radioactiviy Ci 0.00E+01 0.00E+01 D. Tritium

1. Total Release Ci 4.43E+00 4.81E+00 15%

2. Average Release Rate For Period µCi/sec 5.57E-01 6.05E-01

3. Percent of Applicable Limit  % *

• E. Carbon-14

1. Total Release Ci 5.83E+00 4.33E+00 N/A

2. Average Release Rate For Period µCi/sec 7.33E-01 5.44E-01

3. Percent of Applicable Limit  % * *

• Applicable Limits are expressed in terms of dose. See Tables 1-4 of the 2018 Radiological Impact Assessment Report.

• • Zeroes indicate that no radioactivity was present at detectable levels.

• • • N/A - Errors in measurement are not reported for these values since none were identified during the reporting period.

A4-4

Curies Released Gaseous Ground Level Releases During the Period Starting: 1-Jan-2018 Ending: 31-Mar-2018 CONTINUOUS BATCH TOTAL FISSION GASES Argon-41 0.00E+01* 2.03E-01 2.03E-01 Xenon-133 0.00E+01 7.92E-02 7.92E-02 Xenon-135 0.00E+01 1.51E-04 1.51E-04 TOTALS 0.00E+01 2.82E-01 2.82E-01 IODINES TOTALS 0.00E+01 0.00E+01 0.00E+01 PARTICULATES TOTALS 0.00E+01 0.00E+01 0.00E+01 TRITIUM Tritium 1.55E+00 2.58E-01 1.80E+00 CARBON-14 Carbon-14 (CO2 form) 1.12E+00 0.00E+01 1.12E+00 Carbon-14 (Total) 5.61E+00 0.00E+01 5.61E+00

• Zeros indicate that no radioactivity was present at detectable levels.

A4-5

Curies Released Gaseous Ground Level Releases During the Period Starting: 1-July-2018 Ending: 30-Sep-2018 CONTINUOUS BATCH TOTAL FISSION GASES Argon-41 0.00E+01* 6.91E-01 6.91E-01 Xenon-133 0.00E+01 3.36E-01 3.36E-01 Xenon-135 0.00E+01 1.83E-02 1.83E-02 TOTALS 0.00E+01 1.05E+00 1.05E+00 IODINES TOTALS 0.00E+01 0.00E+01 0.00E+01 PARTICULATES TOTALS 0.00E+01 0.00E+01 0.00E+01 TRITIUM Tritium 3.98E+00 4.50E-01 .43E+00 CARBON-14 Carbon-14 (CO2 form) 1.17E+00 0.00E+01 1.17E+00 Carbon-14 (Total) 5.83E+00 0.00E+01 5.83E+00

• Zeros indicate that no radioactivity was present at detectable levels.

A4-6

Curies Released Gaseous Ground Level Releases During the Period Starting: 1-Oct-2018 Ending: 31-Dec-2018 CONTINUOUS BATCH TOTAL FISSION GASES Argon-41 0.00E+01* 1.28E+00 1.28E+00 Xenon-133 0.00E+01 7.99E-01 7.99E-01 Xenon-135 0.00E+01 4.32E-02 4.32E-02 TOTALS 0.00E+01 2.12E+00 2.12E+00 IODINES TOTALS 0.00E+01 0.00E+01 0.00E+01 PARTICULATES TOTALS 0.00E+01 0.00E+01 0.00E+01 TRITIUM Tritium .91E-01 4.12E+00 4.81E+00 CARBON-14 Carbon-14 (CO2 form) 8.65E-01 0.00E+01 8.65E-01 Carbon-14 (Total) 4.33E+00 0.00E+01 4.33E+00

• Zeros indicate that no radioactivity was present at detectable levels.

A4-7

Table 1 Doses from Airborne Effluents First Quarter Individual Doses Quarterly Percent of Location X/Q D/Q Pathway Dose Limit Limit Sector/Distance/Unit (sec/m3) (1/m2)

External Gamma Air 1.89E-04 5 mrad <1 N/950/meters 3.43E-06 9.97E-09 Beta Air 7.47E-05 10 mrad <1 N/950/meters 3.43E-06 9.97E-09 Submersion Total Body 1.25E-04 10 mrad <1 SSW/2129/meters 2.64E-06 7.67E-09 Skin 1.86E-04 10 mrad <1 SSW/2129/meters 2.64E-06 7.67E-09 Organ Doses1 (Max) Child/Bone 2.85E-01 7.5 mrem 3.8 NNE/3770/meters 1.24E-06 2.83E-09 Child/Thyroid 5.75E-02 7.5 mrem <1 NNE/3770/meters 1.24E-06 2.83E-09 Child/Total Body 5.75E-02 7.5 mrem <1 NNE/3770/meters 1.24E-06 2.83E-09 Population Doses Total Body Dose 3.69E-01 man-rem Maximum Organ Dose (organ) 1.82E+00 man-rem (Bone)

Second Quarter Individual Doses Quarterly Percent of Location X/Q D/Q Pathway Dose Limit Limit Sector/Distance/Unit (sec/m3) (1/m2)

External Gamma Air 1.71E-03 5 mrad <1 N/950/meters 7.63E-06 1.36E-08 Beta Air 6.13E-04 10 mrad <1 N/950/meters 7.63E-06 1.36E-08 Submersion Total Body 8.54E-04 10 mrad <1 N/1389/meters 4.29E-06 7.32E-09 Skin 1.26E-03 10 mrad <1 N/1389/meters 4.29E-06 7.32E-09 Organ Doses 1 (Max) Child/Bone 4.25E-01 7.5 mrem 5.7 NW/1316/meters 1.57-06 1.91E-09 Child/Thyroid 8.62E-02 7.5 mrem 1.2 NW/1316/meters 1.57-06 1.91E-09 Child/Total Body 8.62E-02 7.5 mrem 1.2 NW/1316/meters 1.57-06 1.91E-09 Population Doses Total Body Dose 4.44E-01 man-rem Maximum Organ Dose (organ) 2.16E+00 man-rem (Bone)

Population doses can be compared to the natural background dose for the entire 50-mile population of about 95,400 man-rem/year (based on 90 mrem/year for natural background).

1 Organ Doses include contributions from Carbon-14 in the form of Carbon Dioxide Tables 3 and 4 A4-8

Doses from Airborne Effluents Third Quarter Individual Doses Quarterly Percent of Location X/Q D/Q Pathway Dose Limit Limit Sector/Distance/Unit (sec/m3) (1/m2)

External Gamma Air 1.22E-03 5 mrad <1 N/950/meters 6.61E-06 1.58E-08 Beta Air 5.03E-04 10 mrad <1 N/950/meters 6.61E-06 1.58E-08 Submersion Total Body 6.63E-04 10 mrad <1 S/1764/meters 4.27E-06 6.62E-09 Skin 9.91E-04 10 mrad <1 S/1764/meters 4.27E-06 6.62E-09 Organ Doses1 (Max) Child/Bone 4.12E-01 7.5 mrem 5.5 SSW/4532/meters 1.43E-06 2.36E-09 Child/Thyroid 8.37E-02 7.5 mrem 1.1 SSW/4532/meters 1.43E-06 2.36E-09 Child/Total Body 8.37E-02 7.5 mrem 1.1 SSW/4532/meters 1.43E-06 2.36E-09 Population Doses Total Body Dose 5.29E-01 man-rem Maximum Organ Dose (organ) 2.56E+00 man-rem (Bone)

Fourth Quarter Individual Doses Quarterly Percent of Location X/Q D/Q Pathway Dose Limit Limit Sector/Distance/Unit (sec/m3) (1/m2)

External Gamma Air 1.59E-03 5 mrad <1 N/950/meters 4.75E-06 9.23E-09 Beta Air 6.86E-04 10 mrad <1 SSW/1840/meters 5.06E-06 1.12E-08 Submersion Total Body 1.19E-03 10 mrad <1 S/1764/meters 4.04-06 7.33E-09 Skin 1.79E-03 10 mrad <1 S/1764/meters 4.04-06 7.33E-09 Organ Doses1 (Max) Child/Bone 3.25E-01 7.5 mrem 4.3 WSW/1152/meters 1.81E-06 2.07-09 Child/Thyroid 6.69E-02 7.5 mrem <1 WSW/1152/meters 1.81E-06 2.07-09 Child/Total Body 6.69E-02 7.5 mrem <1 WSW/1152/meters 1.81E-06 2.07-09 Population Doses Total Body Dose 4.46E-01 man-rem Maximum Organ Dose (organ) 2.13E+00 man-rem (Bone)

Population doses can be compared to the natural background dose for the entire 50-mile population of about 95,400 man-rem/year (based on 90 mrem/year for natural background).

1 Organ Doses include contributions from Carbon-14 in the form of Carbon Dioxide.

A4-9

Addendum 2 Errata/Corrections to Previous ARERRs: 2017 ARERR A4-10

Gaseous Effluents - Summation of Releases During the Period Starting: 1-Jan-2017 Ending: 30-Jun-2017 Type of Effluent Units Quarter 1 Quarter 2 Estimated Total Error A. Fission and Activation Products

1. Total Release Ci 4.49E-01 3.87E+01 11%

2. Average Release Rate For Period µCi/sec 5.77E-02 4.92E+00

3. Percent of Applicable Limit  % *

• B. Radioiodines

1. Total Iodine-131 Ci 0.00E+01** 0.00E+01 N/A***

2. Average Release Rate For Period µCi/sec 0.00E+01 0.00E+01

3. Percent of Applicable Limit  % *

• C. Particulates

1. Particulates (Half-Lives > 8 Days) Ci 0.00E+01 0.00E+01 N/A

2. Average Release Rate For Period µCi/sec 0.00E+01 0.00E+01

3. Percent of Applicable Limit  % * *

4. Gross Alpha Radioactiviy Ci 0.00E+01 0.00E+01 D. Tritium

1. Total Release Ci 9.25E-01 9.41E+00 15%

2. Average Release Rate For Period µCi/sec 1.19E-01 1.20E+00

3. Percent of Applicable Limit  % *

• E. Carbon-14

1. Total Release Ci 5.24E+00 4.40E+00 N/A

2. Average Release Rate For Period µCi/sec 6.74E-01 5.60E-01

3. Percent of Applicable Limit  % * *

• Applicable Limits are expressed in terms of dose. See Tables 1-4 of the 2017 Radiological Impact Assessment Report.

• • Zeroes indicate that no radioactivity was present at detectable levels.

• • • N/A - Errors in measurement are not reported for these values since none were identified during the reporting period.

A4-11

Gaseous Effluents - Summation of Releases During the Period Starting: 1-Jul-2017 Ending: 31-Dec-2017 Type of Effluent Units Quarter 3 Quarter 4 Estimated Total Error %

A. Fission and Activation Products

1. Total Release Ci 8.49E-01 8.63E-01 11%

2. Average Release Rate For Period µCi/sec 1.07E-01 1.09E-01

3. Percent of Applicable Limit  % *

• B. Radioiodines

1. Total Iodine-131 Ci 0.00E+01** 0.00E+01 N/A***

2. Average Release Rate For Period µCi/sec 0.00E+01 0.00E+01

3. Percent of Applicable Limit  % *

• C. Particulates

1. Particulates (Half-Lives > 8 Days) Ci 0.00E+01 0.00E+01 16%

2. Average Release Rate For Period µCi/sec 0.00E+01 0.00E+01

3. Percent of Applicable Limit  % * *

4. Gross Alpha Radioactiviy Ci 0.00E+01 0.00E+01 D. Tritium

1. Total Release Ci 9.15E-01 2.50E+00 15%

2. Average Release Rate For Period µCi/sec 1.15E-01 3.15E-01

3. Percent of Applicable Limit  % *

• E. Carbon-14

1. Total Release Ci 5.76E+00 5.49E+00 N/A

2. Average Release Rate For Period µCi/sec 7.25E-01 6.98E-01

3. Percent of Applicable Limit  % * *

• Applicable Limits are expressed in terms of dose. See Tables 1-4 of the 2017 Radiological Impact Assessment Report.

• • Zeroes indicate that no radioactivity was present at detectable levels.

• • • N/A - Errors in measurement are not reported for these values since none were identified during the reporting period.

A4-12

Curies Released Gaseous Ground Level Releases During the Period Starting: 1-Jan-2017 Ending: 31-Mar-2017 CONTINUOUS BATCH TOTAL FISSION GASES Argon-41 0.00E+01* 3.38E-01 3.38E-01 Xenon-133 0.00E+01 1.03E-01 1.03E-01 Xenon-135 0.00E+01 7.32E-03 7.32E-03 TOTALS 0.00E+01 4.49E-01 4.49E-01 IODINES Iodine-131 0.00E+01 0.00E+01 0.00E+01 TOTALS 0.00E+01 0.00E+01 0.00E+01 PARTICULATES TOTALS 0.00E+01 0.00E+01 0.00E+01 TRITIUM Tritium 7.67E-01 1.58E-01 9.25E-01 CARBON-14 Carbon-14 (CO2 form) 1.05E+00 0.00E+01 1.05E+00 Carbon-14 (Total) 5.24E+00 0.00E+01 5.24E+00

• Zeros indicate that no radioactivity was present at detectable levels.

A4-13

Curies Released Gaseous Ground Level Releases During the Period Starting: 1-Apr-2017 Ending: 30-Jun-2017 CONTINUOUS BATCH TOTAL FISSION GASES Argon-41 0.00E+01* 1.95E+00 1.95E+00 Xenon-133 0.00E+01 3.67E+01 3.67E+01 Xenon-135 0.00E+01 1.58E-02 1.58E-02 TOTALS 0.00E+01 3.87E+01 3.87E+01 IODINES Iodine-131 0.00E+01 0.00E+01 0.00E+01 TOTALS 0.00E+01 0.00E+01 0.00E+01 PARTICULATES TOTALS 0.00E+01 0.00E+01 0.00E+01 TRITIUM Tritium 1.68E+00 7.73E+00 9.41E+00 CARBON-14 Carbon-14 (CO2 form) 8.80E-01 0.00E+01 8.80E-01 Carbon-14 (Total) 4.40E+00 0.00E+01 4.40E+00

• Zeros indicate that no radioactivity was present at detectable levels.

A4-14

Curies Released Gaseous Ground Level Releases During the Period Starting: 1-July-2017 Ending: 30-Sep-2017 CONTINUOUS BATCH TOTAL FISSION GASES Argon-41 0.00E+01* 7.94E-01 7.94E-01 Xenon-133 0.00E+01 5.29E-02 5.29E-02 Xenon-135 0.00E+01 1.51E-03 1.51E-03 TOTALS 0.00E+01 8.49E-01 8.49E-01 IODINES TOTALS 0.00E+01 0.00E+01 0.00E+01 PARTICULATES TOTALS 0.00E+01 0.00E+01 0.00E+01 TRITIUM Tritium 7.25E-01 1.90E-01 9.15E-01 CARBON-14 Carbon-14 (CO2 form) 1.15E+00 0.00E+01 1.15E+00 Carbon-14 (Total) 5.76E+00 0.00E+01 5.76E+00

• Zeros indicate that no radioactivity was present at detectable levels.

A4-15

Curies Released Gaseous Ground Level Releases During the Period Starting: 1-Oct-2017 Ending: 31-Dec-2017 CONTINUOUS BATCH TOTAL FISSION GASES Argon-41 0.00E+01* 7.34E-01 7.34E-01 Xenon-133 0.00E+01 9.81E-02 9.81E-02 Xenon-135 0.00E+01 3.10E-02 3.10E-02 TOTALS 0.00E+01 8.63E-01 8.63E-01 IODINES TOTALS 0.00E+01 0.00E+01 0.00E+01 PARTICULATES TOTALS 0.00E+01 0.00E+01 0.00E+01 TRITIUM Tritium 1.58E+00 9.21E-01 2.50E+00 CARBON-14 Carbon-14 (CO2 form) 1.10E+00 0.00E+01 1.10E+00 Carbon-14 (Total) 5.49E+00 0.00E+01 5.49E+00

• Zeros indicate that no radioactivity was present at detectable levels.

A4-16

Tables 1 and 2 Doses from Airborne Effluents First Quarter Individual Doses Quarterly Percent of Location X/Q D/Q Pathway Dose Limit Limit Sector/Distance/Unit (sec/m3) (1/m2)

External Gamma Air 5.47E-04 5 mrad <1 NNE/1300/meters 6.11E-06 1.86E-08 Beta Air 2.14E-04 10 mrad <1 NNE/1300/meters 6.11E-06 1.86E-08 Submersion Total Body 1.66E-04 10 mrad <1 NNE/2590/meters 2.21E-06 5.90E-09 Skin 2.47E-04 10 mrad <1 NNE/2590/meters 2.21E-06 5.90E-09 Organ Doses1 (Max) Infant/Bone 5.62E-01 7.5 mrem 7.5 N/1000/meters 3.89E-06 1.12E-08 Infant/Thyroid 1.21E-01 7.5 mrem 1.6 N/1000/meters 3.89E-06 1.12E-08 Infant/Total Body 1.21E-01 7.5 mrem 1.6 N/1000/meters 3.89E-06 1.12E-08 Population Doses Total Body Dose 4.18E-01 man-rem Maximum Organ Dose (organ) 2.08E+00 man-rem (Bone)

Second Quarter Individual Doses Quarterly Percent of Location X/Q D/Q Pathway Dose Limit Limit Sector/Distance/Unit (sec/m3) (1/m2)

External Gamma Air 6.10E-03 5 mrad <1 NNE/1300/meters 6.67E-06 2.00E-08 Beta Air 9.33E-03 10 mrad <1 NNE/1300/meters 6.67E-06 2.00E-08 Submersion Total Body 2.08E-03 10 mrad <1 N/1981/meters 2.67E-06 6.80E-09 Skin 3.88E-03 10 mrad <1 N/1981/meters 2.67E-06 6.80E-09 Organ Doses1 (Max) Infant/Bone 9.26E-01 7.5 mrem 12.3 N/1000/meters 7.50E-06 2.08E-08 Infant/Thyroid 2.14E-01 7.5 mrem 2.9 N/1000/meters 7.50E-06 2.08E-08 Infant/Total Body 2.14E-01 7.5 mrem 2.9 N/1000/meters 7.50E-06 2.08E-08 Population Doses Total Body Dose 3.72E-01 man-rem Maximum Organ Dose (organ) 1.68E+00 man-rem (Bone)

Population doses can be compared to the natural background dose for the entire 50-mile population of about 95,400 man-rem/year (based on 90 mrem/year for natural background).

1 Organ Doses include contributions from Carbon-14 in the form of Carbon Dioxide.

A4-17

Addendum 3 Errata/Corrections to Previous ARERRs: 2016 ARERR A4-18

Gaseous Effluents - Summation of Releases During the Period Starting: 1-Jul-2016 Ending: 31-Dec-2016 Type of Effluent Units Quarter 3 Quarter 4 Estimated Total Error A. Fission and Activation Products

1. Total Release Ci 6.25E-01 1.23E+02 11%

2. Average Release Rate For Period µCi/sec 7.87E-02 1.55E+01

3. Percent of Applicable Limit  % *

• B. Radioiodines

1. Total Iodine-131 Ci 0.00E+01** 0.00E+01 N/A***

2. Average Release Rate For Period µCi/sec 0.00E+01 0.00E+01

3. Percent of Applicable Limit  % *

• C. Particulates

1. Particulates (Half-Lives > 8 Days) Ci 0.00E+01 0.00E+01 16%

2. Average Release Rate For Period µCi/sec 0.00E+01 0.00E+01

3. Percent of Applicable Limit  % * *

4. Gross Alpha Radioactiviy Ci 0.00E+01 0.00E+01 D. Tritium

1. Total Release Ci 7.87E-01 3.28E+00 15%

2. Average Release Rate For Period µCi/sec 9.94E-02 4.12E-01

3. Percent of Applicable Limit  % *

• E. Carbon-14

1. Total Release Ci 5.71E+00 4.56E+00 N/A

2. Average Release Rate For Period µCi/sec 7.34E-01 5.86E-01

3. Percent of Applicable Limit  % * *

• Applicable Limits are expressed in terms of dose. See Tables 1-4 of the 2016 Radiological Impact Assessment Report.

• • Zeroes indicate that no radioactivity was present at detectable levels.

• • • N/A - Errors in measurement are not reported for these values since none were identified during the reporting period.

A4-19

Curies Released Gaseous Ground Level Releases During the Period Starting: 1-July-2016 Ending: 30-Sep-2016 CONTINUOUS BATCH TOTAL FISSION GASES Xenon-133M 0.00E+01* 6.72E-04 6.72E-04 Xenon-135 0.00E+01 1.04E-02 1.04E-02 Argon-41 0.00E+01 2.35E-01 2.35E-01 Xenon-133 0.00E+01 3.79E-01 3.79E-01 TOTALS 0.00E+01 6.25E-01 6.25E-01 IODINES TOTALS 0.00E+01 0.00E+01 0.00E+01 PARTICULATES TOTALS 0.00E+01 0.00E+01 0.00E+01 TRITIUM Tritium 6.62E-01 1.25E-01 7.87E-01 CARBON-14 Carbon-14 (CO2 form) 1.14E+00 0.00E+01 1.14E+00 Carbon-14 (Total) 5.71E+00 0.00E+01 5.71E+00

• Zeros indicate that no radioactivity was present at detectable levels.

A4-20

Curies Released Gaseous Ground Level Releases During the Period Starting: 1-Oct-2016 Ending: 31-Dec-2016 CONTINUOUS BATCH TOTAL FISSION GASES Xenon-135 0.00E+01* 2.27E-02 2.27E-02 Argon-41 0.00E+01 9.62E-01 9.62E-01 Xenon-133 0.00E+01 1.22E+02 1.22E+02 TOTALS 0.00E+01 1.23E+02 1.23E+02 IODINES TOTALS 0.00E+01 0.00E+01 0.00E+01 PARTICULATES TOTALS 0.00E+01 0.00E+01 0.00E+01 TRITIUM Tritium 1.61E+00 1.67E+00 3.28E+00 CARBON-14 Carbon-14 (CO2 form) 9.12E-01 0.00E+01 9.12E-01 Carbon-14 (Total) 4.56E+00 0.00E+01 4.56E+00

• Zeros indicate that no radioactivity was present at detectable levels.

Tables 3 and 4 Doses from Airborne Effluents A4-21

Third Quarter Individual Doses Quarterly Percent of Location X/Q D/Q Pathway Dose Limit Limit Sector/Distance/Unit (sec/m3) (1/m2)

External Gamma Air 2.53E-04 5 mrad <1 NNE/1300/meters 3.88E-06 1.62E-08 Beta Air 1.35E-04 10 mrad <1 NNE/1300/meters 3.88E-06 1.62E-08 Submersion Total Body 2.34E-04 10 mrad <1 S/1764/meters 4.13E-06 6.99E-09 Skin 3.59E-04 10 mrad <1 S/1764/meters 4.13E-06 6.99E-09 Organ Doses1 (Max) Child/Bone 9.29E-01 7.5 mrem 12.4 S/2000/meters 3.44E-06 5.66E-09 Child/Thyroid 1.86E-01 7.5 mrem 2.5 S/2000/meters 3.44E-06 5.66E-09 Child/Total Body 1.86E-01 7.5 mrem 2.5 S/2000/meters 3.44E-06 5.66E-09 Population Doses Total Body Dose 4.51E-01 man-rem Maximum Organ Dose (organ) 2.24E+00 man-rem (Bone)

Fourth Quarter Individual Doses Quarterly Percent of Location X/Q D/Q Pathway Dose Limit Limit Sector/Distance/Unit (sec/m3) (1/m2)

External Gamma Air 8.20E-03 5 mrad <1 NNE/1300/meters 5.11E-06 1.37E-08 Beta Air 2.12E-02 10 mrad <1 NNE/1300/meters 5.11E-06 1.37E-08 Submersion Total Body 7.23E-03 10 mrad <1 SSW/2129/meters 5.40E-06 1.05E-08 Skin 1.62E-02 10 mrad <1 SSW/2129/meters 5.40E-06 1.05E-08 Organ Doses1 (Max) Child/Bone 1.00E+00 7.5 mrem 13.3 NNW/635/meters 6.69E-06 6.60E-09 Child/Thyroid 2.11E-01 7.5 mrem 2.8 NNW/635/meters 6.69E-06 6.60E-09 Child/Total Body 2.11E-01 7.5 mrem 2.8 NNW/635/meters 6.69E-06 6.60E-09 Population Doses Total Body Dose 5.53E-01 man-rem Maximum Organ Dose (organ) 2.56E+00 man-rem (Bone)

Population doses can be compared to the natural background dose for the entire 50-mile population of about 95,400 man-rem/year (based on 90 mrem/year for natural background).

1 Organ Doses include contributions from Carbon-14 in the form of Carbon Dioxide.

A4-22

Table 9 Total Dose from Fuel Cycle First Second Third Fourth Dose Quarter Quarter Quarter Quarter Total Body or any Organ (except thyroid)

Total body air submersion 3.18E-04 1.69E-04 2.34E-04 7.23E-03 Critical organ dose (air) 4.94E-01 9.28E-01 9.29E-01 1.00E+00 Total body dose (liquid) 7.20E-05 1.20E-03 1.10E-03 8.50E-03 Maximum organ dose (liquid) 1.60E-04 1.40E-03 1.30E-03 9.00E-03 Direct Radiation Dose 0.00E+00 0.00E+00 0.00E+00 0.00E+00 Total 4.95E-01 9.31E-01 9.32E-01 1.02E+00 Cumulative Total Dose (Total body or any other organ) mrem 3.38E+00 Annual Dose Limit (mrem) 25 Percent of Limit 13.5 Thyroid Dose (mrem)

Total body air submersion 3.18E-04 1.69E-04 2.34E-04 7.23E-03 Thyroid dose (airborne) 1.01E-01 1.86E-01 1.86E-01 2.11E-01 Total body dose (liquid) 7.20E-05 1.20E-03 1.10E-03 8.50E-03 Thyroid dose (liquid) 6.80E-05 1.20E-03 1.10E-03 8.50E-03 Direct Radiation Dose 0.00E+00 0.00E+00 0.00E+00 0.00E+00 Total 1.01E-01 1.89E-01 1.88E-01 2.35E-01 Cumulative Total Dose (Thyroid) mrem 7.13E-01 Annual Dose Limit (mrem) 75 Percent of Limit 0.95 A4-23