ML13126A172

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2012 Annual Radioactive Effluent Release Report and Radiological Impact Assessment Report for 2012
ML13126A172
Person / Time
Site: Sequoyah  Tennessee Valley Authority icon.png
Issue date: 04/30/2013
From:
Tennessee Valley Authority
To:
Office of Nuclear Reactor Regulation
References
Download: ML13126A172 (75)
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Text

ENCLOSURE 1 ANNUAL RADIOACTIVE EFFLUENT RELEASE REPORT SEQUOYAH NUCLEAR PLANT JANUARY - DECEMBER 2012

Enclosure 1 ANNUAL RADIOACTIVE EFFLUENT RELEASE REPORT SEQUOYAH NUCLEAR PLANT 2012 E1-1

2012 SEQUOYAH NUCLEAR PLANT (SQN)

EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT 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 (1-131), Iodine-133 (1-133), 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-1 31, Iodine-1 33, 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.OE-04 microcuries/milliliter (pCi/ml) total activity.

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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.

I1. 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 liCi/ml is applied. This ECL is based on the Xenon-1 35 (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

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-1 31, Iodine-1 33, 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.

Ill. 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-01 33, "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.

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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.OOE-01 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 1-131 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 the activity released from each vent for the sampling periods.

B. lodines 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.

C. Carbon-14 in Gaseous Releases The Carbon-14 production and effluent source term estimates were based on Electric Power Institute methodology provided in EPRI Report 1021106, "Estimation of E1-4

Carbon-14 in Nuclear Power Plant Gaseous Effluents," December 2010. It was determined that 19.8 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. Liguid 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 daily. In addition to ODCM Table 2.2-1, tritium concentrations are determined daily, 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.

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Monitorinq 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 18 non-REMP monitoring wells to support monitoring the onsite groundwater plume and for the presence or increase of radioactivity. These wells are sampled periodically for tritium. The tritium concentrations obtained in 2012 from these non-REMP wells are listed below. Initial and follow up analyses for the semi-annual sampling procedure indicated no gamma activity or Hard to Detect nuclides.

Well ID Date Activity in pCi/L Date Activity in pCi/L Well-24 4/16/2012 <219 7/11/2012 <230 Well-24 10/09/2012 <236 N/A N/A Well-25 4/16/2012 <219 7/11/2012 <230 Well-25 10/09/2012 <236 N/A N/A Well-26 4/16/2012 <219 7/11/2012 <230 Well-26 10/09/2012 <236 N/A N/A Well-27 4/17/2012 <219 7/12/2012 <230 Well-27 10/10/2012 <236 N/A N/A Well-28 4/17/2012 <219 7/12/2012 340 Well-28 10/09/2012 <236 N/A N/A Well-29 4/18/2012 407 6/22/2012 745 Well-29 7/11/2012 Covered 10/09/2012 Covered Well-30 4/16/2012 Obstructed 7/11/2012 Obstructed Well-30 10/11/2012 <236 N/A N/A Well-31 4/18/2012 6840 6/22/2012 5677 Well-31 7/11/2012 Covered 10/11/2012 Covered Well-32 4/18/2012 <230 7/12/2012 <230 Well-32 10/10/2012 <236 N/A N/A Well-34 4/17/2012 <230 7/12/2012 <230 Well-34 10/10/2012 <236 N/A N/A Well-35 4/17/2012 <230 7/12/2012 <230 Well-35 10/10/2012 <236 N/A N/A GP-7A 4/18/2012 Dry 7/11/2012 493 GP-7A 10/11/2012 351 N/A N/A GP-13 4/18/2012 4540 7/11/2012 4163 GP-13 10/11/2012 5326 N/A N/A W-9 4/18/2012 <218 7/12/2012 <230 W-9 10/11/2012 <236 N/A N/A WE-10 1/25/2012 21095 2/23/2012 22272 WE-10 3/28/2012 20368 4/18/2012 14704 WE-10 5/27/2012 17848 6/22/2012 18170 Well ID Date Activity in pCi/L Date Activity in pCi/L WE-10 7/12/2012 18437 8/26/2012 19312 WE-10 10/10/2012 19489 N/A N/A E1-6

Doses from 1-131 Water Inaestion 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 1-131 specific analysis for drinking water pathway samples if the annual dose from 1-131 is greater than 1 mrem.

In order to evaluate the need for implementation of this additional analysis, the drinking water pathway dose from 1-131 to the maximum organ and age group was calculated.

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

Quarter I 2 3 4 Totals 1-131 Ci 0.00E+01 0.OOE+01 0.OOE+01 0.00E+01 O.OOE+01 Infant/Thyroid (mrem) 0.00E+01 O.OOE+01 0.OOE+01 0.OOE+01 O.OOE+01 Population/Thyroid (mrem) 0.OOE+01 0.OOE+01 0.OOE+01 O.OOE+01 O.OOE+01 There was no detectable 1-131 released via this pathway during this reporting period.

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V. BATCH RELEASES Value

1. Liquid (Radwaste only) 1st Half 2nd Half Units
a. Number of releases 115 89 Each
b. Total time period of releases 17349.98 21831.00 Minutes
c. Maximum time period of release 1947 2100.00 Minutes
d. Average time period of releases 150.87 245.29 Minutes
e. Minimum time period of release 10.00 60.00 Minutes
f. Average dilution stream flow during release periods 31145.0 26377.0 CFS
2. Gaseous (Batches only - containment purges, and waste gas decay tanks)
a. Number of releases 56 56 Each
b. Total time period of releases 36188.00 40839.00 Minutes
c. Maximum time period of release 5673.00 12609.00 Minutes
d. Average time period of releases 646.08 729.27 Minutes
e. Minimum time period of release 14.00 15.00 Minutes VI. ABNORMAL RELEASES Value
1. Liquid 1st Half 2nd Half Units
a. Number of releases 0 0
b. Total activity released 0.OOE-01 0.OOE-01 Ci
2. Gaseous 1st Half 2nd Half Units
a. Number of releases 2 4
b. Total activity released 1.38E-03 3.56E-03 Ci Release Type: Gaseous Release Point: Unit 2 unmonitored Date(s) of Release: 4th Quarter, 12/28/2012 at 0500 through 12/28/2012 at 1200 The CILRT containment release is intended to be an un-monitored release with three release pathways: one each through the Aux Bldg. and the Shield Bldg. and one through an unmonitored path to the SQN environs. For conservatism, the pressurized containment volume is modeled to be released through the un-monitored pathway at the total release rate. This will provide the maximum calculated dose Pre-release samples were collected and analyzed with the following results:
1. Tritium 3.806E-08 pCi/ml
2. Noble Gas no observed activity
3. Particulate no observed activity
4. Iodine no observed activity E1-8

A pre-release permit was generated using the full containment volume of 1.1922E+06 CF and a flow rate of 2.0E+04 CFM. The pre-release permit was processed to the OPEN status and no limits were exceeded.

The release was conducted on 28 December, 2012, starting at 0500 and ending at 1200. The permit was processed to the CLOSED status and no limits were exceeded.

The activity of 8.45E-04 Ci was added to the 4th Quarter Table "Curies Released in Gaseous Ground Level Releases," and the 4th Quarter doses in Table "Doses from Airborne Effluents."

Release Type: Gaseous (Steam)

Release Point: Unit 1 Steam Generator Atmoshperic Relief Valve (ARVs)

Date(s) of Release: 1st Quarter, 02/29/2012 at 0855 through 03/30/2012 at 0842 This evaluation is for the release to the environment that occurred from the Unit 1 ARVs following a reactor trip on February 26, 2012, to Unit 1 Cycle 18 Refueling Outage. Following the reactor trip, the Steam Generator ARVs 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:

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

  • During Cycle 18, there have been no gamma emitting radionuclides identified in any Secondary Coolant samples.

The volume of each steam generator was taken from Westinghouse Guidelines for Secondary Water Chemistry. The listed normal water level value of 3379 ft3 was used as a conservative value. This calculation assumes that the total volume of all four generators was released and that all the tritium present in that initial volume was released. The calculation for the total tritium activity released is as follows:

3379 ft3/generator

  • 2.832E+04 mi/ft 3
  • 4 generators = 3.828E+08 ml 2.765E-06 pCi/ml
  • 3.828E+08 ml = 1.058E+03 pCi of H3 or 1.058E-03 Ci of H3 The activity of 1.058E-03 curies was added to the 1st Quarter Table "Curies Released in Gaseous Ground Level Releases," and the 1st Quarter doses in Table "Doses from Airborne Effluents."

Release Type: Gaseous (Steam)

Release Point: Unit 1 ARV 2 Date(s) of Release: 2nd Quarter, 04/01/2012 at 1452 through 04/02/2012 at 0059 This evaluation is for the release to the environment that occurred from Unit 1. The Unit 1 ARV 2 gave an open indication on April 01, 2012. The following is data used to determine the curies and dose impacts as a result of the release:

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" The evaluation assumed the release was continuous from ARV 2 only.

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

The volume of each steam generator was taken from Westinghouse Guidelines for Secondary Water Chemistry. The listed normal water level value of 3379 ft3 was used as a conservative value. This calculation assumes that the total volume of all four generators was released and that all the tritium present in that initial volume was released. The calculation for the total tritium activity released is as follows:

3379 ft3/generator

  • 2.832E+04 mi/ft3
  • 1 generator = 9.569E+07 ml 3.387E-06 pCi/ml
  • 9.569E+07 ml = 3.241 E+02 pCi of H3 or 3.241 E-04 Ci of H3 The activity of 3.241 E-04 curies was added to the 2nd Quarter Table "Curies Released in Gaseous Ground Level Releases," and the 2nd Quarter doses in Table "Doses from Airborne Effluents."

Release Type: Gaseous (Steam)

Release Point: Unit 2 ARVs 2 and 4 Date(s) of Release: 3rd Quarter, 08/16/2012 at 1850 through 08/16/2012 at 1859 This evaluation is for the release to the environment that occurred from Unit 2. Unit 2 ARVs 2 and 4 gave an open indication on August 16, 2012. 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 ARV 2 and 4 only.

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

The volume of each steam generator was taken from Westinghouse Guidelines for Secondary Water Chemistry. The listed normal water level value of 3516 ft 3 was used as a conservative value. This calculation assumes that the total volume of all four generators was released and that all the tritium present in that initial volume was released. The calculation for the total tritium activity released is as follows:

3516 ft3/generator

  • 2.832E+04 mi/ft3
  • 2 generators = 1.992E+08 ml 3.744E-06 pCi/ml
  • 1.992E+08 ml = 7.458E+02 pCi of H3 or 7.458E-04 Ci of H3 The activity of 7.458E-04 curies was added to the 3rd Quarter Table "Curies Released in Gaseous Ground Level Releases," and the 3rd Quarter doses in Table "Doses from Airborne Effluents."

Release Type: Gaseous (Steam)

Release Point: Unit 2 ARVs Date(s) of Release: 4th Quarter, 10/15/2012 at 1528 through 10/21/2012 at 1647 El-10

This evaluation is for the release to the environment that occurred from the Unit 2 ARVs following a reactor trip on October 15, 2012, to Unit 2 Cycle 18 Refueling and Steam Generator Replacement Outage. Following the reactor trip, the Steam Generator ARVs were open for periods of time prior to removing the Steam Generators. The following is data used to determine the curies and dose impacts as a result of the release:

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

" During Cycle 18, there have been no gamma emitting radionuclides identified in any Secondary Coolant samples.

The volume of each steam generator was taken from Westinghouse Guidelines for Secondary Water Chemistry. The listed normal water level value of 3516 ft 3 was used as a conservative value. This calculation assumes that the total volume of all four generators was released and that all the tritium present in that initial volume was released. The calculation for the total tritium activity released is as follows:

3516 ft3/generator

  • 2.832E+04 mi/ft3
  • 4 generators = 3.983E+08 ml 2.089E-06 pCi/ml
  • 3.983E+08 ml = 8.321 E+02 pCi of H3 or 8.321 E-04 Ci of H3 The activity of 8.321 E-04 curies was added to the 4th Quarter Table "Curies Released in Gaseous Ground Level Releases," and the 4th Quarter doses in Table "Doses from Airborne Effluents."

Release Type: Gaseous (Steam)

Release Point: Unit 2 ARVs Date(s) of Release: 4th Quarter, 12/17/2012 at 1234 through 12/30/2012 at 2026 This evaluation is for the release to the environment that occurred from the Unit 2 ARVs following a reactor trip on October 15, 2012, to Unit 2 Cycle 18 Refueling and Steam Generator Replacement Outage. Following the installation of the new Steam Generators, the Steam Generator ARVs were open for periods of time until the plant came back online. The following is data used to determine the curies and dose impacts as a result of the release:

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

" During Cycle 18, there have been no gamma emitting radionuclides identified in any Secondary Coolant samples.

The volume of each 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 all four generators was released and that all the tritium present in that initial volume was released. The calculation for the total tritium activity released is as follows:

El-11

3516 ft3/generator

  • 2.832E+04 ml/ft3
  • 4 generators = 3.983E+08 ml 2.853E-06 pCi/ml
  • 3.983E+08 ml = 1.136E+03 pCi of H3 or 1.136E-03 Ci of H3 The activity of 8.321 E-04 curies was added to the 4th Quarter Table "Curies Released in Gaseous Ground Level Releases," and the 4th Quarter doses in Table "Doses from Airborne Effluents."

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Liquid Effluents-Summation of Releases During the Period Starting: 1-Jan-2012 Ending: 30-Jun-2012 Est.

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

1. Total Release (Not Including Tritium, Gases, Ci 7.77E-03 2.08E-03 18%

Alpha)

2. Average Diluted Concentration During Period pCi/mI 4.01 E-09 1.11 E-09
3. Percent Of Applicable Limit  %*
1. Total Release Ci 6.95E+02 1.03E+02 18%
2. Average Diluted Concentration During Period PCi/mI 3.58E-04 5.54E-05
3. Percent Of Applicable Limit  % *
  • C. Dissolved And Entrained Gases
1. Total Release Ci 3.18E-03 3.35E-06 39%
2. Average Diluted Concentration During Period PCi/mI 1.64E-09 1.80E-12
3. Percent Of Applicable Limit  % 5.06E-05 9.OOE-07 D. Gross Alpha Radioactivity
1. Total Release Curies 0.OOE+01** 0.OOE+01 N/A***

E. Total Waste Volume Released Liters 5.57E+07 1.56E+08 4%

(Pre-Dilution)

F. Volume Of Dilution Water Used Liters 1.88E+09 1.71E+09 4%

G. Radwaste Volume Released Liters 2.36E+06 1.22E+06 N/A

  • Applicable Limits are expressed in terms of dose. See Tables 5-8 of the 2012 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.

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Liquid Effluents-Summation of Releases During the Period Starting: 1-Jul-2012 Ending: 31-Dec-2012 Est.

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

1. Total Release (Not Including Tritium, Gases, Ci 9.94E-04 1.06E-01 18%

Alpha)

2. Average Diluted Concentration During Period pCi/ml 4.69E-10 5.33E-08
3. Percent Of Applicable Limit  %*
1. Total Release Ci 8.64E+02 1.37E+02 18%
2. Average Diluted Concentration During Period pCi/mI 4.08E-04 6.88E-05
3. Percent Of Applicable Limit  % *
  • C. Dissolved And Entrained Gases
1. Total Release Ci 9.80E-04 6.48E-04 39%
2. Average Diluted Concentration During Period pCi/ml 4.62E-10 3.26E-10
3. Percent Of Applicable Limit  % 2.31 E-04 1.63E-04 D. Gross Alpha Radioactivity
1. Total Release Curies O.OOE+01** 0.OOE+01 N/A***

E. Total Waste Volume Released Liters 2.40E+08 4.03E+08 4%

(Pre-Dilution)

F. Volume Of Dilution Water Used Liters 1.88E+09 1.58E+09 4%

G. Radwaste Volume Released Liters 1.83E+06 2.OOE+06 N/A

  • Applicable Limits are expressed in terms of dose. See Tables 5-8 of the 2012 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.

El-14

Curies Released in Liquid Effluents During the period Starting: 1-Jan-2012 Ending 31-Mar-2012 Continuous Batch Total Tritium 1.76E-01 6.94E+02 6.95E+02 FISSION & ACTIVATION PRODUCTS Silver- 11OM O.OOE+01 3.70E-05 3.70E-05 Berylium-7 O.OOE+01 3.82E-05 3.82E-05 Colbalt-57 O.OOE+01 1.03E-05 1.03E-05 Cobalt-58 O.OOE+01 1.60E-03 1.60E-03 Cobalt-60 O.OOE+01 1.44E-03 1.44E-03 Chromium-51 O.OOE+01 2.09E-04 2.09E-04 Cesium-137 O.OOE+01 1.94E-04 1.94E-04 Iron-55 O.OOE+01 3.70E-03 3.70E-03 Lanthanum-140 O.OOE+01 4.07E-06 4.07E-06 Manganese-54 O.OOE+01 2.28E-05 2.28E-05 Niobium-95 O.OOE+01 3.94E-05 3.94E-05 Antimony-1 24 O.OOE+01 6.1 OE-05 6.1 OE-05 Antimony-1 25 O.OOE+01 3.95E-04 3.95E-04 Tin-113 O.OOE+01 6.30E-06 6.30E-06 Zinc-95 O.OOE+01 8.97E-06 8.97E-06 TOTALS O.OOE+01 7.77E-03 7.77E-03 DISSOLVED AND ENTRAINED GASES Xenon-1 33 O.OOE+01 3.12E-03 3.12E-03 Xenon-135 O.OOE+01 5.97E-05 5.97E-05 TOTALS O.OOE+01 3.18E-03 3.18E-03

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

El-15

Curies Released in Liquid Effluents During the period Starting: 1-Apr-2012 Ending 30-Jun-2012 Continuous Batch Total Tritium 3.98E-01 1.03E+02 1.03E+02 FISSION & ACTIVATION PRODUCTS Cobalt-57 0.00E+01 1.65E-06 1.65E-06 Cobalt-58 0.OOE+01 8.81 E-04 8.81 E-04 Cobalt-60 O.OOE+01 6.11E-04 6.11 E-04 Cesium-1 37 0.OOE+01 7.77E-06 7.77E-06 Iron-55 0.OOE+01 5.03E-04 5.03E-04 Antimony-124 0.OOE+01 3.07E-05 3.07E-05 Antimony-1 25 0.OOE+01 4.24E-05 4.24E-05 TOTALS 0.OOE+01 2.08E-03 2.08E-03 DISSOLVED AND ENTRAINED GASES Xenon-133 0.OOE+01 3.35E-06 3.35E-06 TOTALS 0.OOE+01 3.35E-06 3.35E-06

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

El-16

Curies Released in Liquid Effluents During the period Starting: 1-Jul-2012 Ending 30-Sep-2012 Continuous Batch Total Tritium 7.73E-01 8.63E+02 8.64E+02 FISSION & ACTIVATION PRODUCTS Cobalt-58 O.OOE+01 1.61 E-04 1.61 E-04 Cobalt-60 O.OOE+01 3.95E-04 3.95E-04 Iron-55 O.OOE+01 2.96E-04 2.96E-04 Antimony-124 O.OOE+01 1.49E-05 1.49E-05 Antimony-125 O.OOE+01 1.27E-04 1.27E-04 TOTALS O.OOE+01 9.94E-04 9.94E-04 DISSOLVED AND ENTRAINED GASES Xenon-1 33 O.OOE+01 9.87E-04 9.87E-04 Xenon-135 O.OOE+01 2.70E-06 2.70E-06 TOTALS O.OOE+01 9.80E-04 9.80E-04

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

El-17

Curies Released in Liquid Effluents During the period Starting: 1-Oct-2012 Ending 31-Dec-2012 Continuous Batch Total Tritium 9.39E-01 1.36E+02 1.37E+02 FISSION & ACTIVATION PRODUCTS Cobalt-57 0.OOE+01 2.29E-04 2.29E-04 Cobalt-58 0.OOE+01 9.63E-02 9.63E-02 Cobalt-60 0.OOE+01 4.29E-03 4.29E-03 Cesium-137 0.OOE+01 5.80E-06 5.80E-06 Iron-55 O.OOE+01 2.68E-03 2.68E-03 Iron-59 O.OOE+01 1.65E-05 1.65E-05 Antimony-124 O.OOE+01 4.56E-04 4.56E-04 Antimony-125 O.OOE+01 2.25E-03 2.25E-03 TOTALS 0.OOE+01 1.06E-01 1.06E-01 DISSOLVED AND ENTRAINED GASES Krypton-88 O.OOE+01 7.76E-05 7.76E-05 Xenon-133 O.OOE+01 5.71E-04 5.71 E-04 TOTALS O.OOE+01 6.49E-04 6.49E-04

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

E1-18

TABLE A LIQUID "TYPICAL LLD" EVALUATION(1 )

At (2)

Nuclide ODCM LLD 1 hr 8 hr 32 hr Manganese-54 5.OE-07 3.36E-08 3.36E-08 3.37E-08 Cobalt-58 5.OE-07 2.53E-08 2.54E-08 2.56E-08 Iron-59 5.OE-07 5.26E-08 5.29E-08 5.37E-08 Cobalt-60 5.OE-07 4.63E-08 4.63E-08 4.64E-08 Zinc-65 5.OE-07 2.95E-08 2.95E-08 2.96E-08 Molybdenum-99 5.OE-07 1.55E-07 1.67E-07 2.15E-07 Cesium-1 34 5.OE-07 1.91 E-08 1.91E-08 1.92E-08 Cesium-1 37 5.OE-07 3.87E-08 3.87E-08 3.87E-08 Cerium-141 5.OE-07 2.80E-08 2.81 E-08 2.87E-08 Cerium-144 5.OE-06 1.11 E-07 1.12E-07 1.12E-07 Iodine-131 1.OE-06 2.28E-08 2.34E-08 2.55E-08 Krypton-87 1.OE-05 1.16E-07 5.25E-07 (3)

Krypton-88 1.OE-05 9.95E-08 5.49E-07 (3)

Xenon-133 1.OE-05 4.19E-08 4.36E-08 4.98E-08 Xenon-133m 1.OE-05 1.42E-07 1.55E-07 2.13E-07 Xenon-1 35 1.OE-05 2.06E-08 3.50E-08 2.17E-07 Xenon-138 1.OE-05 8.37E-06 (3) (3)

Nuclide ODCM LLD Typical LLD Tritium 1.OE-05 1.2E-06 Gross Alpha 1.OE-07 2.OE-08 Strontium-89/90 5.0E-08 3.8E-08/1.4E-08 Iron-55 1.OE-06 1.3E-08 NOTES: (1) LLD values are in piCi/ml.

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

(3) T /2 too short.

El-19

Gaseous Effluents - Summation of Releases During the Period Starting: 1-Jan-2012 Ending: 30-Jun-2012 Type of Effluent Units Quarter I Quarter 2 Estimated Total Error A. Fission and Activation Products

1. Total Release Ci 2.27E+00 3.50E-01 11%
2. Average Release Rate For Period pCi/sec 2.89E-01 4.45E-02
3. Percent of Applicable Limit  %*
  • B. Radioiodines
1. Total Iodine-131 Ci 1.70E-06 O.OOE+01 13%
2. Average Release Rate For Period pCi/sec 2.16E-07 O.OOE+01
3. Percent of Applicable Limit  %*
  • C. Particulates
1. Particulates (Half-Lives > 8 Days) Ci O.OOE+01 O.OOE+01 16%
2. Average Release Rate For Period pCi/sec O.OOE+01 O.OOE+01
3. Percent of Applicable Limit  % *
4. Gross Alpha Radioactiviy Ci O.OOE+01 O.OOE+01 D. Tritium
1. Total Release Ci 4.83E+01 1.49E+01 15%
2. Average Release Rate For Period pCi/sec 6.14E+00 1.89E+00
3. Percent of Applicable Limit  % *
1. Total Release Ci 4.57E+00 5.61E+00 N/A
2. Average Release Rate For Period pCi/sec 5.81 E-01 7.14E-01
3. Percent of Applicable Limit  % * *
  • Applicable Limits are expressed in terms of dose. See Tables 1-4 of the 2012 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.

E1-20

Gaseous Effluents - Summation of Releases During the Period Starting: 1-Jul-2012 Ending: 31-Dec2012 Type of Effluent Units Quarter 3 Quarter 4 Estimated Total Error A. Fission and Activation Products

1. Total Release Ci 1.05E+00 3.15E-01 11%
2. Average Release Rate For Period pCi/sec 1.32E-01 3.96E-02
3. Percent of Applicable Limit  %*
  • B. Radioiodines
1. Total Iodine-131 Ci 0.OOE+01 0.OOE+01 N/A**
2. Average Release Rate For Period pCi/sec 0.OOE+01 0.OOE+01
3. Percent of Applicable Limit  %*
  • C. Particulates
1. Particulates (Half-Lives > 8 Days) Ci 0.OOE+01 1.38E-06 16%
2. Average Release Rate For Period pCi/sec 0.OOE+01 1.73E-07
3. Percent of Applicable Limit  %* *
4. Gross Alpha Radioactiviy Ci 0.OOE+01 O.OOE+01 D. Tritium
1. Total Release Ci 9.45E+00 6.89E+00 15%
2. Average Release Rate For Period pCi/sec 1.19E+00 8.67E-01
3. Percent of Applicable Limit  % *
1. Total Release Ci 5.75E+00 3.36E+00 N/A
2. Average Release Rate For Period pCi/sec 7.23E-01 4.23E-01
3. Percent of Applicable Limit  % * *
  • Applicable Limits are expressed in terms of dose. See Tables 1-4 of the 2012 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.

El-21

Curies Released in Gaseous Ground Level Releases During the Period Starting: 1-Jan-2012 Ending: 31-Mar-2012 CONTINUOUS BATCH TOTAL FISSION GASES Xenon-133 O.OOE+01 1.53E-01 1.53E-01 Xenon-135 O.OOE+01 3.90E-03 3.90E-03 Argon-41 O.OOE+01 2.12E+00 2.12E+00 TOTALS O.OOE+01 2.27E+00 2.27E+00 IODINES Iodine-131 1.70E-06 O.OOE+01 1.70E-06 TOTALS 1.70E-06 O.OOE+01 1.70E-06 PARTICULATES TOTALS O.OOE+01 O.OOE+01 O.OOE+01 TRITIUM Tritium 4.76E+01 6.90E-01 4.83E+01 CARBON-14 Carbon-14 (CO 2 form) 8.97E-01 O.OOE+01 8.97E-01 Carbon-14 (Total) 4.57E+00 O.OOE+01 4.57E+00

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

El-22

Curies Released in Gaseous Ground Level Releases During the Period Starting: 1-Apr-2012 Ending: 30-Jun-2012 CONTINUOUS BATCH TOTAL FISSION GASES Krypton-85M 0.OOE+01 5.54E-05 5.54E-05 Xenon-133 O.OOE+01 1.32E-01 1.32E-01 Xenon-135 O.OOE+01 1.01 E-02 1.01E-02 Argon-41 O.OOE+01 2.08E-01 2.08E-01 TOTALS O.OOE+01 3.50E-01 3.50E-01 IODINES TOTALS 0.OOE+01 0.OOE+01 0.OOE+01 PARTICULATES TOTALS 0.00E+01 0.OOE+01 0.OOE+01 TRITIUM Tritium 1.43E+01 5.77E-01 1.49E+01 CARBON-14 Carbon-14 (CO 2 form) 1.10E+00 0.OOE+O I 1.10E+00 Carbon-14 (Total) 5.61 E+00 O.OOE+01 5.61 E+00

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

El-23

Curies Released in Gaseous Ground Level Releases During the Period Starting: 1-July-2012 Ending: 30-Sep-2012 CONTINUOUS BATCH TOTAL FISSION GASES Xenon-1 33 O.OOE+01 3.66E-01 3.66E-01 Xenon-135 O.OOE+01 2.77E-02 2.77E-02 Argon-41 O.OOE+01 6.54E-01 6.54E-01 TOTALS O.OOE+01 1.05E+00 1.05E+00 IODINES TOTALS O.OOE+01 O.OOE+01 O.OOE+01 PARTICULATES TOTALS O.OOE+01 O.OOE+01 O.OOE+01 TRITIUM Tritium 8.56E+00 8.85E-01 9.45E+00 CARBON-14 Carbon-14 (CO 2 form) 1.13E+00 O.OOE+OI 1.13E+00 Carbon-14 (Total) 5.75E+00 O.OOE+O I 5.75E+00

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

E1-24

Curies Released in Gaseous Ground Level Releases During the Period Starting: 1-Oct-2012 Ending: 31-Dec-2012 CONTINUOUS BATCH TOTAL FISSION GASES Xenon-133 O.OOE+01 1.79E-01 1.79E-01 Xenon-135 O.OOE+01 5.41 E-03 5.41 E-03 Argon-41 O.OOE+01 1.30E-01 1.30E-01 TOTALS O.OOE+01 3.15E-01 3.15E-01 IODINES TOTALS O.OOE+01 O.OOE+01 O.OOE+01 PARTICULATES Colbalt-58 1.38E-06 O.OOE+01 1.38E-06 TOTALS 1.38E-06 O.OOE+01 1.38E-06 TRITIUM Tritium 3.40E+00 3.49E+00 6.89E+00 CARBON-14 Carbon-14 (CO 2 form) 6.59E-01 O.OOE+01 6.60E-01 Carbon-14 (Total) 3.36E+00 O.OOE+01 3.36E+00

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

E1-25

TABLE B GASEOUS "TYPICAL" LLD EVALUATION(1 )

Noble Gas At (2)

Nuclide ODCM LLD 1 hr 1.5 hr Krypton-87 1 .0E-04 2.08E-06 2.73E-06 Krypton-88 1.OE-04 1.61 E-06 1.81 E-06 Xenon-133 1.OE-04 6.61E-07 6.63E-07 Xenon-133m 1.0E-04 2.34E-06 2.35E-06 Xenon-135 1.OE-04 3.43E-07 3.56E-07 Xenon-138 1.OE-04 1.40E-04 6.10E-04 Particulate Sample (3) 1 hr 24 hr 7.0 day Manganese-54 1.OE-10 7.47E-12 3.12E-13 4.48E-14 Cobalt-58 1.OE-10 5.62E-12 2.35E-1 3 3.46E-14 Iron-59 1.OE-10 1.20E-1 1 5.02E-1 3 7.49E-14 Cobalt-60 1.0E-10 1.07E-11 4.46E-13 6.38E-14 Zinc-65 1.OE-10 6.71E-12 2.80E-13 4.03E-14 Molybdenum-99 1.OE-10 3.43E-11 1.61E-12 4.70E-13 Cesium-i134 1.OE-10 4.25E-12 1.77E-13 2.54E-14 Cesium-i137 Cerium-i41 1.OE-10 8.48E-12 3.54E-13 5.05E-14 Cerium-144 1.OE-10 5.10E-12 2.15E-13 3.26E-14 Iodine-131 1.0E-10 2.01E-11 8.33E-13 1.20E-13 Charcoal Sample 1.0E-10 4.76E-12 2.07E-13 3.77E-14 Iodine-131 1.OE-11 7.25E-12 3.15E-13 5.74E-14 Note:

(1) LLD values are in 1.Ci/ml.

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

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

E1-26

TABLE B GASEOUS "TYPICAL" LLD EVALUATION(1 ) (continued)

Nuclide ODCM LLD Typical LLD Tritium 1.OE-06 1.OE-11 Gross Alpha 1.OE-11 1.5E-14 Strontium-89 1.OE-11 1.OE-14 Strontium-90 1.OE-11 1.OE-15 NOTE:

(1) LLD values are in pCi/cc.

E1-27

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 m3 None N/A Bottoms, etc. Ci None N/A
b. Dry Active Waste, Compressible Waste m3 6.04E+01 +1.OOE+01 Contaminated Equipment, etc. Ci 2.56E-01 +2.29E+01
c. Irradiated Components, Control m3 None N/A Rods, etc. Ci None N/A
d. Other: Mechanical Filters m3 None N/A Ci None N/A The reported volume is based on the defined volume of the packaging. During transit, the waste may settle resulting in an overall reduced volume. The reduction in disposal volume is estimated to be 10 percent less than the package volume.

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 Currie 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%

E1-28

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 None N/A N/A

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

Curies Percent

1. Chromium-51 2.95E-03 1.15
2. Manganese-54 1.81 E-02 7.09
3. Iron-55 1.98E-01 77.36
4. Iron-59 1.34E-03 0.53
5. Cobalt-57 2.90E-05 0.01
6. Cobalt-58 3.29E-03 1.29
7. Cobalt-60 1.73E-02 6.76
8. Nickel-63 8.21 E-03 3.21
9. Zinc-65 5.86E-03 2.29
10. Zirconium-95 3.62E-04 0.14
11. Niobium-95 4.04E-04 0.16
12. Cesium-134 2.11E-07 0.00
13. Cesium-137 3.15E-05 0.01
14. Cerium-144 6.78E-05 0.03
c. Irradiated Components Curies Percent None N/A N/A
d. Other: Mechanical Filters Curies Percent None N/A N/A El-29

SOLID WASTE (RADIOACTIVE SHIPMENTS) (continued)

3. Solid Waste Disposition
a. Spent resins, filter sludges, evaporator bottoms, etc.

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

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

Number of Shipments Type Quantity Mode of Destination Transportation 5 A-LSA II Motor Freight EnergySolutions Processing Facility Oak Ridge, TN 5 Limited Quantity Motor Freight EnergySolutions Processing Facility Kingston, TN

c. Irradiated components, control rods, etc.

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

d. Other: Mechanical Filters Number of Shipments Type Quantity Mode of Destination Transportation None N/A N/A N/A
4. Irradiated Fuel Shipments (Disposition)

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

5. Solidification of Waste Was solidification performed? No If yes, solidification media: N/A E1-30

Independent Spent Fuel Storage Installation SQN implemented use of an independent spent fuel storage installation (ISFSI) on July13, 2004, utilizing 10 CFR 72.214 Certificate of Compliance (CoC number 1014). The ISFSI is located on site, within the protected area and is designed to hold 90 spent fuel canisters.

CoC 1014 Appendix A Section 5.4 requires an annual report in accordance with 10 CFR 72.44(d)(3). A report has been submitted providing the results of any releases during this monitoring period. CoC 1014 Section 5.4 also provides that the ISFSI operations may be considered part of plant operations for the purposes of the radiological environmental monitoring program.

CoC 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 spent fuel storage canister."

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 1014 provides that the HI-STORM 100 Cask System does 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.

E1-31

ENCLOSURE 2 RADIOLOGICAL IMPACT ASSESSMENT REPORT SEQUOYAH NUCLEAR PLANT 2012 E2-1

2012 SEQUOYAH NUCLEAR PLANT RADIOLOGICAL IMPACT ASSESSMENT REPORT 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 1.0.

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 joint frequency distributions (JFDs) 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 15.25 mrem/quarter at onsite (at or near the site boundary) stations and approximately 13.75 mrem/quarter at offsite stations, or approximately 1.50 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 2-6 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 was no identifiable increase in dose rate levels attributable to direct radiation from plant equipment and/or gaseous effluents.

E2-5

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 89 mrem. Using this value, and subtracting an annual background value of 0 mrem/year (from perimeter dosimeters around Sequoyah from Area dosimeter posting data for the year), and multiplying by the ratio of the occupancy times (2000/8760), the external dose was 20.32 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.

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Tables 1 and 2 Doses from Airborne Effluents First Quarter Individual Doses Quarterly Percent of Location Pathway Dose Limit Limit Sector/Distance/Unit External Gamma Air 2.47E-03 mrad 5 mrad <1% N/950/meters Beta Air 8.91 E-04mrad 10 mrad <1% N/950/meters Submersion Total Body 1.57E-03 mrad 10 mrad <1% SSW/2129/meters Skin 2.32E-03 mrad 10 mrad <1% SSW/2129/meters Organ Doses 1 (Max) Child/Bone 3.35E-01 mrem 7.5 mrem 4.47% NNE3271/meters Child/Thyroid 8.22E-02 mrem 7.5 mrem 1.10% NNE3271/meters Child/Total Body 8.22E-02 mrem 7.5 mrem 1.10% NNE3271/meters Population Doses Total Body Dose 5.90E-01 man-rem Maximum Organ Dose (organ) 2.08E+00 man-rem (Bone)

Second Quarter Individual Doses Quarterly Percent of Location Pathway Dose Limit Limit Sector/Distance/Unit External Gamma Air 3.15E-04 mrad 5 mrad <1 N/950/meters Beta Air 1.36E-04 mrad 10 mrad <1 N/950/meters Submersion Total Body 1.83E-04 mrad 10 mrad <1 SSW/2129/meters Skin 2.75E-04 mrad 10 mrad <1 SSW/2129/meters Organ Doses 1 (Max) Child/Bone 4.66E-01 mrem 7.5 mrem 6.21% SSW/3349/meters Child/Thyroid 9.86E-02 mrem 7.5 mrem 1.31% SSW/3349/meters Child/Total Body 9.86E-02 mrem 7.5 mrem 1.31% SSW/3349/meters Population Doses Total Body Dose 5.38E-01 man-rem Maximum Organ Dose (organ) 2.42E+00 man-rem (Bone)

Populationdoses can be compared to the natural backgrounddose for the entire 50-mile population of about 95,400 man-rem/year (basedon 90 mrem/year for natural background).

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

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Tables 3 and 4 Doses from Airborne Effluents Third Quarter Individual Doses Quarterly Percent of Location Pathway Dose Limit Limit Sector/Distance/Unit External Gamma Air 9.30E-04 mrad 5 mrad <1 N/950/meters Beta Air 3.90E-04 mrad 10 mrad <1 N/950/meters Submersion Total Body 7.16E-04 mrad 10 mrad <1 S/1786/meters Skin 1.07E-03 mrad 10 mrad <1 S/1 786/meters Organ Doses 1 (Max) Child/Bone 4.21E-01 mrem 7.5 mrem 5.61% SSW/3349/meters Child/Thyroid 8.72E-02 mrem 7.5 mrem 1.16% SSW/3349/meters Child/Total Body 8.72E-02 mrem 7.5 mrem 1.16% SSW/3349/meters Population Doses Total Body Dose 4.86E-01 man-rem Maximum Organ Dose (organ) 2.27E+00 man-rem (Bone)

Fourth Quarter Individual Doses Quarterly Percent of Location Pathway Dose Limit Limit Sector/Distance/Units External Gamma Air 1.98E-04mrad 5 mrad <1 N/950/meters Beta Air 1.01 E-04 mrad 10 mrad <1 N/950/meters Submersion Total Body 1.43E-04 mrad 10 mrad <1 SSW/2129/meters Skin 2.18E-04 mrad 10 mrad <1 SSW/2129/meters Organ Doses 1 (Max) Child/Bone 3.24E-Olmrem 7.5 mrem 4.32% SSW/3349/meters Child/Thyroid 6.77E-02 mrem 7.5 mrem <1 SSW/3349/meters Child/Total Body 6.77E-02 mrem 7.5 mrem <1 SSW/3349/meters Population Doses Total Body Dose 4.33E-01 man-rem Maximum Organ Dose (organ) 1.99E+00 man-rem (Bone)

Populationdoses can be compared to the naturalbackground 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.

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Tables 5 and 6 Doses from Liquid Effluents First Quarter Individual Doses (mreml Quarterly Limit Percent of Age Group Organ Dose Limit Child Total Body 2.70E-03 1.5 mrem < 1%

Child Liver 2.70E-03 5 mrem < 1%

Child Thyroid 2.70E-03 5 mrem < 1%

Average Riverflow past SQN (cubic feet per second): 50,430 Population Doses Total Body Dose 1.80E-01 man-rem Maximum Organ Dose (organ) 1.80E-01 man-rem (GIT, Bone, Thyroid, Liver, Kidney, Lung)

Second Quarter Individual Doses (mrem)

Quarterly Limit Percent of Age Group Organ Dose Limit Child Total Body 1.70E-03 1.5 mrem < 1%

Child Liver/Bone 1.80E-03 5 mrem < 1%

Child Thyroid 1.70E-03 5 mrem < 1%

Average Riverflow past SQN (cubic feet per second): 11,860 Population Doses Total Body Dose 1.20E-01 man-rem Maximum Organ Dose (organ) 1.20E-01 man-rem (Bone, Liver, GIT, Thyroid, Kidney, Lung)

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

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Tables 7 and 8 Doses from Liquid Effluents Third Quarter Individual Doses (mremr Quarterly Limit Percent of Age Group Organ Dose Limit Child Total Body 7.20E-03 1.5 mrem < 1%

Child Liver/Bone 7.20E-03 5 mrem < 1%

Child Thyroid 7.20E-03 5 mrem < 1%

Average Riverflow past SQN (cubic feet per second): 23,525 Population Doses Total Body Dose 4.80E-01 man-rem Maximum Organ Dose (organ) 4.80E-01 man-rem (Bone, Liver, GIT, Thyroid, Kidney, Lung)

Fourth Quarter Individual Doses (mrem)

Quarterly Limit Percent of Age Group Organ Dose Limit Child Total Body 1.10E-03 1.5 mrem < 1%

Child Liver/Bone 1.10E-03 5 mrem < 1%

Child Thyroid 1.10E-03 5 mrem < 1%

Average Riverflow past SQN (cubic feet per second): 29,229 Population Doses Total Body Dose 7.OOE-02 man-rem Maximum Organ Dose (organ) 7.50E-02 man-rem (GIT)

Populationdoses can be compared to the natural backgrounddose for the entire 50-mile population of about 95,400 man-rem/year (basedon 90 mrem/year for naturalbackground).

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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 1.57E-03 1.83E-04 7.16E-04 1.43E-04 Critical organ dose (air) 3.35E-01 4.66E-01 4.21E-01 3.24E-01 Total body dose (liquid) 2.70E-03 1.70E-03 7.20E-03 1.10E-03 Maximum organ dose (liquid) 2.70E-03 1.80E-03 7.20E-03 1.1OE-03 Direct Radiation Dose O.OOE+01 O.OOE+01 O.OOE+01 O.OOE+01 Total 3.42E-01 4.70E-01 4.36E-01 3.26E-01 Cumulative Total Dose (Total body or any other organ) mrem 1.57E+00 Annual Dose Limit (mrem) 25 Percent of Limit 6.28 Thyroid Dose (mrem Total body air submersion 1.57E-03 1.83E-04 7.16E-04 1.43E-04 Thyroid dose (airborne) 8.22E-02 9.86E-02 8.72E-02 6.77E-02 Total body dose (liquid) 2.70E-03 1.70E-03 7.20E-03 1.10E-03 Thyroid dose (liquid) 2.70E-03 1.70E-03 7.20E-03 1.10E-03 Direct Radiation Dose O.OOE+01 O.OOE+01 O.OOE+01 O.OOE+01 Total 8.92E-02 1.02E-01 1.02E-01 7.OOE-02 Cumulative Total Dose (Thyroid) mrem 3.63E-01 Annual Dose Limit (mrem) 75 Percent of Limit 0.48 E2-11

Attachment 1.0 Joint Frequency Distribution Tables Al-I

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, 2012 - MAR 31, 2012 WIND WIND SPEED(MPH)

DIRECTION CALM 0.6-1.4 1.5-3.4 3.5-5.4 5.5-7.4 7.5-12.4 12.5-18.4 18.5-24.4 >=24.5 TOTAL N 0.000 0.000 0.000 0.046 0.046 0.092 0.000 0.000 0.000 0.185 NNE 0.000 0.000 0.000 0.000 0.092 0.092 0.000 0.000 0.000 0.185 NE 0.000 0.000 0.000 0.046 0.139 0.000 0.000 0.000 0.000 0.185 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 0.046 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 0.046 0.000 0.000 0.000 0.000 0.000 0.046 S 0.000 0.000 0.000 0.000 0.000 0.185 0.000 0.000 0.000 0.185 SSW 0.000 0.000 0.000 0.000 0.277 0.277 0.000 0.000 0.000 0.555 SW 0.000 0.000 0.000 0.046 0.231 0.185 0.000 0.000 0.000 0.462 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 0.277 0.046 0.000 0.000 0.370 WNW 0.000 0.000 0.000 0.000 0.046 0.277 0.000 0.000 0.000 0.324 NW 0.000 0.000 0.000 0.000 0.046 0.000 0.000 0.000 0.000 0.046 NNW 0.000 0.000 0.000 0.000 0.092 0.092 0.046 0.000 0.000 0 .231 SUBTOTAL 0.000 0.000 0.000 0.231 1.063 1.479 0.092 0.000 0.000 2.866 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2163 TOTAL HOURS OF STABILITY CLASS A 62 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS A 62 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2163 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: 2012/05/21 MEAN WIND SPEED = 8.37 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, 2012 - MAR 31, 2012 WIND WIND SPEED (MPH)

DIRECTION CALM 0.6-1.4 1.5-3.4 3.5-5.4 5.5-7.4 7.5-12.4 12.5-18.4 18.5-24.4 >=24.5 TOTAL N 0.000 0.000 0.000 0.046 0.092 0.092 0.046 0.000 0.000 0.277 NNE 0.000 0.000 0.000 0.000 0.231 0.139 0.000 0.000 0.000 0.370 NE 0.000 0.000 0.000 0.139 0.139 0.046 0.000 0.000 0.000 0.324 ENE 0.000 0.000 0.046 0.046 0.000 0.000 0.000 0.000 0.000 0.092 E 0.000 0.000 0.000 0.046 0.000 0.000 0.000 0.000 0.000 0.046 ESE 0.000 0.000 0.000 0.046 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 0.092 0.000 0.000 0.000 0.092 S 0.000 0.000 0.000 0.000 0.092 0.185 0.000 0.000 0.000 0.277 SSW 0.000 0.000 0.000 0.000 0.555 0.139 0.000 0.000 0.000 0.693 SW 0.000 0.000 0.000 0.092 0.231 0.000 0.000 0.000 0.000 0.324 WSW 0.000 0.000 0.000 0.000 0.046 0.046 0.000 0.000 0.000 0.092 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 0.185 0.000 0.000 0.000 0.185 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 0.046 0.277 0.185 0.046 0.000 0.000 0.555 SUBTOTAL 0.000 0.000 0.046 0.462 1.664 1.156 0.092 0.000 0.000 3.421 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2163 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 2163 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: 2012/05/21 MEAN WIND SPEED = 7.25 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS AI-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, 2012 - MAR 31, 2012 WIND WIND SPEED(MPH)

DIRECTION CALM 0.6-1.4 1.5-3.4 3.5-5.4 5.5-7.4 7.5-12.4 12.5-18.4 18.5-24.4 >=24.5 TOTAL N 0.000 0.000 0.046 0.092 0.139 0.000 0.000 0.000 0.000 0.277 NNE 0.000 0.000 0.000 0.185 0.231 0.277 0.046 0.000 0.000 0.740 NE 0.000 0.000 0.046 0.139 0.139 0.046 0.000 0.000 0.000 0.370 ENE 0.000 0.000 0.092 0.000 0.000 0.000 0.000 0.000 0.000 0.092 E 0.000 0.000 0.046 0.046 0.000 0.000 0.000 0.000 0.000 0.092 ESE 0.000 0.000 0.046 0.046 0.000 0.000 0.000 0.000 0.000 0.092 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 0.092 0.046 0.046 0.000 0.000 0.000 0.185 S 0.000 0.000 0.000 0.185 0.185 0.185 0.000 0.000 0.000 0.555 SSW 0.000 0.000 0.000 0.092 0.740 0.277 0.000 0.000 0.000 1.110 SW 0.000 0.000 0.000 0.277 0.370 0.000 0.000 0.000 0.000 0.647 WSW 0.000 0.000 0.000 0.000 0.185 0.000 0.000 0.000 0.000 0.185 W 0.000 D.000 0.000 0.000 0.000 0.185 0.000 0.000 0.000 0.185 WNW 0.000 0.000 0.000 0.000 0.046 0.046 0.000 0.000 0.000 0.092 NW 0.000 0.000 0.000 0.000 0.139 0.046 0.000 0.000 0.000 0.185 NNW 0.000 0.000 0.046 0.000 0.185 0.139 0.000 0.000 0.000 0.370 SUBTOTAL 0.000 0.000 0.324 1.156 2.404 1.248 0.046 0.000 0.000 5.178 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2163 TOTAL HOURS OF STABILITY CLASS C 112 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS C 112 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2163 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: 2012/05/21 MEAN WIND SPEED = 6.51 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS AI-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, 2012 - MAR 31, 2012 WIND WIND SPEED(MPH)

DIRECTION CALM 0.6-1.4 1.5-3.4 3.5-5.4 5.5-7.4 7.5-12.4 12.5-18.4 18.5-24.4 >=24.5 TOTAL N 0.000 0.000 0.370 1.202 1.387 0.971 0.000 0.000 0.000 3.930 NNE 0.000 0.000 1.387 2.450 1.202 1.156 0.000 0.000 0.000 6.195 NE 0.000 0.231 0.740 0.370 0.370 0.046 0.000 0.000 0.000 1.757 ENE 0.000 0.046 0.416 0.139 0.000 0.000 0.000 0.000 0.000 0.601 E 0.000 0.000 0.185 0.000 0.000 0.000 0.000 0.000 0.000 0.185 ESE 0.000 0.000 0.231 0.000 0.000 0.000 0.000 0.000 0.000 0.231 SE 0.000 0.046 0.046 0.000 0.000 0.000 0.000 0.000 0.000 0.092 SSE 0.000 0.000 0.185 0.046 0.185 0.185 0.000 0.000 0.000 0.601 S 0.000 0.046 0.555 0.693 0.832 0.786 0.000 0.000 0.000 2.913 SSW 0.000 0.046 1.294 3.282 1.433 1.063 0.092 0.000 0.000 7.212 SW 0.000 0.000 1.110 1.248 0.832 0.139 0.000 0.000 0.000 3.329 WSW 0.000 0.000 0.277 0.277 0.139 0.462 0.046 0.000 0.000 1.202 W 0.000 0.046 0.139 0.185 0.092 0.324 0.092 0.000 0.000 0.878 WNW 0.000 0.092 0.046 0.185 0.139 0.277 0.000 0.000 0.000 0.740 NW 0.000 0.092 0.139 0.416 0.416 0.601 0.000 0.000 0.000 1.664 NNW 0.000 0.000 0.185 0.416 0.786 0.693 0.046 0.000 0.000 2.127 SUBTOTAL 0.000 0.647 7.305 10.911 7.813 6.704 0.277 0.000 0.000 33.657 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2163 TOTAL HOURS OF STABILITY CLASS D 728 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS D 728 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2163 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: 2012/05/21 MEAN WIND SPEED = 5.40 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, 2012 - MAR 31, 2012 WIND WIND SPEED(MPH)

DIRECTION CALM 0.6-1.4 1.5-3.4 3.5-5.4 5.5-7.4 7.5-12.4 12.5-18.4 18.5-24.4 >=24.5 TOTAL N 0.000 0.231 2.080 0.601 0.231 0.046 0.000 0.000 0.000 3.190 NNE 0.000 0.092 4.022 1.757 0.509 0.000 0.000 0.000 0.000 6.380 NE 0.000 0.231 0.462 0.231 0.000 0.000 0.000 0.000 0.000 0.925 ENE 0.000 0.092 0.185 0.000 0.000 0.000 0.000 0.000 0.000 0.277 E 0.000 0.185 0.139 0.000 0.000 0.000 0.000 0.000 0.000 0.324 ESE 0.000 0.092 0.046 0.046 0.000 0.000 0.000 0.000 0.000 0.185 SE 0.000 0.046 0.046 0.000 0.000 0.000 0.000 0.000 0.000 0.092 SSE 0.000 0.185 0.462 0.370 0.046 0.000 0.000 0.000 0.000 1.063 S 0.000 0.185 0.971 1.156 0.555 0.416 0.000 0.000 0.000 3.282 SSW 0.000 0.139 2.312 1 .479 1.572 1.156 0.000 0.000 0.000 6. 657 SW 0.000 0.416 2.681 1.341 0.693 0.416 0.000 0.000 0.000 5.548 WSW 0.000 0.092 0.786 0.277 0.092 0.046 0.000 0.000 0.000 1 .294 W 0.000 0.000 0.231 0.324 0.046 0.046 0.000 0.000 0.000 0.647 WNW 0.000 0.046 0.277 0.000 0.092 0.000 0.000 0.000 0.000 0.416 NW 0.000 0.139 0.462 0.509 0.277 0.139 0.000 0.000 0.000 1.526 NNW 0.000 0.185 0.878 0.693 0.092 0.000 0.000 0.000 0.000 1 .849 SUBTOTAL 0.000 2.358 16.043 8.784 4.207 2.265 0.000 0.000 0.000 33.657 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2163 TOTAL HOURS OF STABILITY CLASS E 728 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS E 728 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2163 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: 2012/05/21 MEAN WIND SPEED 3.72 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS AI-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, 2012 - MAR 31, 2012 WIND WIND SPEED (MPH)

DIRECTION CALM 0.6-1.4 1.5-3.4 3.5-5.4 5.5-7.4 7.5-12.4 12.5-18.4 18.5-24.4 >=24.5 TOTAL N 0 .000 0.046 0.277 0.046 0.000 0.000 0.000 0.000 0.000 0.370 NNE 0 .000 0.046 2.959 0.324 0.046 0.000 0.000 0.000 0.000 3.375 NE 0 .000 0.092 0.740 0.185 0.000 0.000 0.000 0.000 0.000 1.017 ENE 0 .000 0.000 0.231 0.046 0.000 0.000 0.000 0.000 0.000 0.277 E 0 .000 0.231 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.231 ESE 0.000 0.000 0.046 0.000 0.000 0.000 0.000 0.000 0.000 0.046 SE 0.000 0.092 0.185 0.000 0.000 0.000 0.000 0.000 0.000 0.277 SSE 0.000 0. 139 0.139 0.000 0.000 0.000 0.000 0.000 0.000 0.277 S 0.000 0.139 0.462 0.092 0.000 0.046 0.000 0.000 0.000 0.740 SSW 0.000 0. 185 2.265 0.139 0.092 0.000 0.000 0.000 0.000 2.681 SW 0.000 0.092 1.896 0.647 0.046 0.000 0.000 0.000 0.000 2.681 WSW 0.000 0.046 0.231 0.139 0.000 0.000 0.000 0.000 0.000 0.416 W 0.000 0.092 0.000 0.092 0.000 0.000 0.000 0.000 0.000 0.185 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 0.046 0.185 0.046 0.000 0.000 0.000 0.000 0.000 0.277 SUBTOTAL 0.000 1.248 9.709 1.757 0.185 0.046 0.000 0.000 0.000 12.945 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2163 TOTAL HOURS OF STABILITY CLASS F 280 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS F 280 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2163 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: 2012/05/21 MEAN WIND SPEED = 2.53 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS Al-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, 2012 - MAR 31, 2012 WIND WIND SPEED (MPH)

DIRECTION CALM 0.6-1.4 1.5-3.4 3.5-5.4 5.5-7.4 7.5-12.4 12.5-18.4 18.5-24.4 >=24.5 TOTAL N 0.000 0.000 0.185 0.000 0.000 0.000 0.000 0.000 0.000 0.185 NNE 0.000 0.046 1.156 0.092 0.046 0.000 0.000 0.000 0.000 1.341 NE 0.000 0.509 1.433 0.092 0.000 0.000 0.000 0.000 0.000 2.034 ENE 0.000 0.324 0.139 0.000 0.000 0.000 0.000 0.000 0.000 0.462 E 0.000 0.231 0.046 0.000 0.000 0.000 0.000 0.000 0.000 0.277 ESE 0.000 0.092 0.139 0.000 0.000 0.000 0.000 0.000 0.000 0.231 SE 0.000 0.231 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.231 SSE 0.000 0.277 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.277 S 0.000 0.231 0.231 0.000 0.000 0.000 0.000 0.000 0.000 0.462 SSW 0.000 0.370 1.110 0.046 0.000 0.000 0.000 0.000 0.000 1.526 SW 0.000 0.046 1.017 0.046 0.000 0.000 0.000 0.000 0.000 1.110 WSW 0.000 0.000 0.046 0.000 0.000 0.000 0.000 0.000 0.000 0.046 W 0.000 0.000 0.000 0.046 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 0.000 0.000 0.000 0.000 0.000 NNW 0.000 0.000 0.046 0.000 0.000 0.000 0.000 0.000 0.000 0.046 SUBTOTAL 0.000 2.358 5.548 0.324 0.046 0.000 0.000 0.000 0.000 8.276 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2163 TOTAL HOURS OF STABILITY CLASS G 179 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS G 179 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2163 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: 2012/05/21 MEAN WIND SPEED = 2.03 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS AI-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, 2012 - JUN 30, 2012 WIND WIND SPEED(MPH)

DIRECTION CALM 0.6-1.4 1.5-3.4 3.5-5.4 5.5-7.4 7.5-12.4 12.5-18.4 18.5-24.4 >=24.5 TOTAL N 0.000 0.000 0.000 0.046 0.000 0.325 0.000 0.000 0.000 0.372 NNE 0.000 0.000 0.000 0.186 0.279 0.325 0.000 0.000 0.000 0.790 NE 0.000 0.000 0.093 0.790 0.093 0.000 0.000 0.000 0.000 0.976 ENE 0.000 0.000 0.046 0.093 0.000 0.000 0.000 0.000 0.000 0.139 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 0.046 0.000 0.000 0.000 0.000 0.046 SSE 0.000 0.000 0.000 0.046 0.046 0.000 0. 000 0.000 0.000 0.093 S 0.000 0.000 0.000 0.000 0.325 0.046 0. 000 0.000 0.000 0.372 SSW 0.000 0.000 0.046 0.465 1.255 0.093 0. 000 0.000 0.000 1.860 SW 0 .000 0.000 0.000 0.418 0.046 0.000 0. 000 0.000 0.000 0.465 WSW 0.000 0.000 0.046 0.000 0.046 0.000 0. 000 0.000 0.000 0.093 W 0.000 0.000 0.000 0.000 0.000 0.000 0. 000 0.000 0.000 0.000 WNW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 NW 0.000 0.000 0.000 0.000 0.000 0.046 0.000 0.000 0.000 0.046 NNW 0.000 0.000 0.000 0.000 0.000 0.232 0.000 0.000 0.000 0.232 SUBTOTAL 0.000 0.000 0.232 2.046 2.139 1.069 0.000 0.000 0.000 5.486 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2178 TOTAL HOURS OF STABILITY CLASS A 118 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS A 118 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2151 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: 2012/08/15 MEAN WIND SPEED = 5.96 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS AI-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, 2012 - JUN 30, 2012 WIND WIND SPEED(MPH)

DIRECTION CALM 0.6-1.4 1.5-3.4 3.5-5.4 5.5-7.4 7.5-12.4 12.5-18.4 18.5-24.4 >=24.5 TOTAL N 0.000 0.000 0.000 0.139 0.186 0.186 0.000 0.000 0.000 0.511 NNE 0.000 0.000 0.139 0.558 0.046 0.139 0.000 0.000 0.000 0.883 NE 0.000 0.000 0.046 0.558 0.000 0.000 0.000 0.000 0.000 0.604 ENE 0.000 0.000 0.046 0.139 0.000 0.000 0.000 0.000 0.000 0.186 E 0.000 0.000 0.000 0.046 0.000 0.000 0.000 0.000 0.000 0.046 ESE 0.000 0.000 0.046 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 0.093 0.000 0.000 0.000 0.000 0.000 0.093 S 0.000 0.000 0.046 0.046 0.046 0.000 0.000 0.000 0.000 0.139 SSW 0.000 0.000 0.000 0.744 0 .697 0.139 0.000 0.000 0.000 1.581 SW 0.000 0.000 0.093 0.697 0.279 0.000 0.000 0.000 0.000 1.069 WSW 0.000 0.000 0.046 0.000 0.000 0.000 0.000 0.000 0.000 0.046 W 0.000 0.000 0.000 0.046 0.000 0.046 0.000 0.000 0.000 0.093 WNW 0.000 0.000 0.000 0.000 0.093 0.000 0.000 0.000 0.000 0.093 NW 0.000 0.000 0.000 0.000 0.046 0.000 0.000 0.000 0.000 0.046 NNW 0.000 0.000 0.046 0.000 0.046 0.000 0.000 0.000 0.000 0.093 SUBTOTAL 0.000 0.000 0.511 3.115 1.441 0.511 0.000 0.000 0.000 5.579 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2178 TOTAL HOURS OF STABILITY CLASS B 120 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS B 120 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2151 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: 2012/08/15 MEAN WIND SPEED = 5.17 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS Al-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, 2012 - JUN 30, 2012 WIND WIND SPEED(MPH)

DIRECTION CALM 0.6-1.4 1.5-3.4 3.5-5.4 5.5-7.4 7.5-12.4 12.5-18.4 18.5-24.4 >=24.5 TOTAL N 0.000 0.000 0.186 0.186 0.139 0.139 0.000 0.000 0.000 0.651 NNE 0.000 0.000 0.139 0.604 0.186 0.000 0.000 0.000 0.000 0.930 NE 0.000 0.000 0.232 0.232 0.000 0.046 0.000 0.000 0.000 0.511 ENE 0.000 0.000 0.139 0.000 0.000 0.000 0.000 0.000 0.000 0.139 E 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 ESE 0.000 0.000 0.046 0.046 0.000 0.000 0.000 0.000 0.000 0.093 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 0.093 0.000 0.000 0.000 0.000 0.000 0.093 S 0.000 0.000 0.000 0.325 0.232 0.000 0.000 0.000 0.000 0.558 SSW 0.000 0.000 0.093 1.953 0.279 0.139 0.000 0.000 0.000 2. 464 SW 0 .000 0.000 0.186 0.930 0.093 0.046 0.000 0.000 0.000 1.255 WSW 0.000 0.000 0.046 0.000 0.000 0.000 0.000 0.000 0.000 0.046 W 0.000 0.000 0.000 0.046 0.046 0.000 0.000 0.000 0.000 0.093 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 0.046 0.000 0.046 0.093 0.000 0.000 0.000 0.186 NNW 0.000 0.000 0.000 0.046 0.046 0.186 0.000 0.000 0.000 0.279 SUBTOTAL 0.000 0.000 1.116 4.510 1.069 0.651 0.000 0.000 0.000 7.345 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2178 TOTAL HOURS OF STABILITY CLASS C 158 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS C 158 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2151 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: 2012/08/15 MEAN WIND SPEED = 4.81 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS Al-I1

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, 2012 - JUN 30, 2012 WIND WIND SPEED (MPH)

DIRECTION CALM 0.6-1.4 1.5-3.4 3.5-5.4 5.5-7.4 7.5-12.4 12.5-18.4 18.5-24.4 >=24.5 TOTAL N 0.000 0.186 1.209 1.255 0.976 0.232 0.000 0.000 0.000 3.859 NNE 0.000 0.000 1.302 3.161 1.441 0.418 0.000 0.000 0.000 6.323 NE 0.000 0.046 0.604 0.465 0.046 0.046 0.000 0.000 0.000 1.209 ENE 0.000 0.046 0.232 0.000 0.000 0.000 0.000 0.000 0.000 0.279 E 0.000 0.000 0.186 0.000 0.000 0.000 0.000 0.000 0.000 0.186 ESE 0.000 0.000 0.418 0.000 0.000 0.000 0.000 0.000 0.000 0.418 SE 0.000 0.000 0.139 0.093 0.000 0.000 0.000 0.000 0.000 0.232 SSE 0.000 0.046 0.558 0.325 0.186 0.000 0.000 0.000 0.000 1.116 S 0.000 0.046 1 .116 1. 627 0.511 0.000 0.000 0.000 0.000 3.301 SSW 0.000 0.000 2.557 3.766 0.790 0.139 0.000 0.000 0.000 7.252 SW 0.000 0.000 1 .999 1.534 0.279 0.093 0.000 0.000 0.000 3.905 WSW 0.000 0.000 0.418 0.186 0.046 0.000 0.000 0.000 0.000 0. 651 W 0.000 0.000 0.186 0.139 0.093 0.000 0.000 0.000 0.000 0.418 WNW 0.000 0.046 0.186 0.093 0.186 0.093 0.000 0.000 0.000 0.604 NW 0.000 0.046 0.139 0.232 0.325 0.186 0.000 0.000 0.000 0.930 NNW 0.000 0.093 0.325 0.279 0.325 0.279 0.000 0.000 0.000 1.302 SUBTOTAL 0.000 0.558 11.576 13.157 5.207 1.488 0.000 0.000 0.000 31.985 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2178 TOTAL HOURS OF STABILITY CLASS D 691 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS D 688 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2151 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: 2012/08/15 MEAN WIND SPEED = 4.17 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS Al-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, 2012 - JUN 30, 2012 WIND WIND SPEED(MPH)

DIRECTION CALM 0.6-1.4 1.5-3.4 3.5-5.4 5.5-7.4 7.5-12.4 12.5-18.4 18.5-24.4 >=24.5 TOTAL N 0.000 0,418 3.347 0.790 0.093 0.000 0.000 0.000 0.000 4.649 NNE 0.000 0.465 2.836 1.023 0.418 0.000 0.000 0.000 0.000 4.742 NE 0.000 0.232 0.511 0.186 0.000 0.000 0.000 0.000 0.000 0.930 ENE 0.000 0.093 0.139 0.000 0.000 0.000 0.000 0.000 0.000 0.232 E 0.000 0.046 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.046 ESE 0.000 0.139 0.186 0.000 0.000 0.000 0.000 0.000 0.000 0.325 SE 0.000 0.232 0.325 0.046 0.000 0.000 0.000 0.000 0.000 0.604 SSE 0.000 0.093 0.325 0.093 0.000 0.046 0.000 0.000 0.000 0.558 S 0.000 0.418 1.720 0.558 0.139 0.046 0.000 0.000 0.000 2.882 SSW 0.000 0.325 2.557 0.651 0.325 0.000 0.000 0.000 0.000 3.859 SW 0.000 0.232 2.929 1.209 0.093 0.000 0.000 0.000 0.000 4 .463 WSW 0.000 0.000 0.837 0.232 0.139 0.000 0.000 0.000 0.000 1.209 W 0.000 0.186 0.325 0.232 0.000 0.000 0.000 0.000 0.000 0.744 WNW 0.000 0.046 0.418 0.232 0.093 0.000 0.000 0.000 0.000 0.790 NW 0.000 0.279 0.372 0.279 0.000 0.000 0.000 0.000 0.000 0. 930 NNW 0.000 0.325 1.395 0.930 0.046 0.000 0.000 0.000 0.000 2. 696 SUBTOTAL 0.000 3,533 18.224 6.462 1.348 0.093 0.000 0.000 0.000 29.661 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2178 TOTAL HOURS OF STABILITY CLASS E 651 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS E 638 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2151 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: 2012/08/15 MEAN WIND SPEED = 2.82 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS Al-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, 2012 - JUN 30, 2012 WIND WIND SPEED(MPH)

DIRECTION CALM 0.6-1.4 1.5-3.4 3.5-5.4 5.5-7.4 7.5-12.4 12.5-18.4 18.5-24.4 >=24.5 TOTAL N 0.000 0.232 2.603 0.139 0.000 0.000 0.000 0.000 0.000 2.975 NNE 0.000 0.744 4.695 0.139 0.000 0.000 0.000 0.000 0.000 5.579 NE 0.000 0.418 0.558 0.046 0.000 0.000 0.000 0.000 0.000 1.023 ENE 0.000 0.372 0.046 0.000 0.000 0.000 0.000 0.000 0.000 0.418 E 0.000 0. 139 0.093 0.000 0.000 0.000 0.000 0.000 0.000 0.232 ESE 0.000 0.279 0.046 0.000 0.000 0.000 0.000 0.000 0.000 0.325 SE 0.000 0.418 0.139 0.000 0.000 0.000 0.000 0.000 0.000 0.558 SSE 0.000 0.465 0.139 0.000 0.000 0.000 0.000 0.000 0.000 0.604 S 0.000 0.279 0.418 0.000 0.000 0.000 0.000 0.000 0.000 0.697 SSW 0.000 0.232 1.023 0.000 0.000 0.000 0.000 0.000 0.000 1.255 SW 0.000 0.046 0.837 0.232 0.000 0.000 0.000 0.000 0.000 1.118 WSW 0.000 0.139 0.279 0.186 0.000 0.000 0.000 0.000 0.000 0.604 W 0.000 0.000 0.093 0.093 0.000 0.000 0.000 0.000 0.000 0.186 WNW 0.000 0.046 0.232 0.000 0.000 0.000 0.000 0.000 0.000 0.279 NW 0.000 0.186 0.093 0.093 0.000 0.000 0.000 0.000 0.000 0.372 NNW 0.000 0.232 0.651 0.186 0.000 0.000 0.000 0.000 0.000 1.069 SUBTOTAL 0.000 4.231 11.948 1 .116 0.000 0.000 0.000 0.000 0.000 17.294 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2178 TOTAL HOURS OF STABILITY CLASS F 382 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS F 372 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2151 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: 2012/08/15 MEAN WIND SPEED - 2.03 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS Al-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, 2012 - JUN 30, 2012 WIND WIND SPEED (MPH)

DIRECTION CALM 0.6-1.4 1.5-3.4 3.5-5.4 5.5-7.4 7.5-12.4 12.5-18.4 18.5-24.4 >=24.5 TOTAL N 0.000 0.000 0.046 0.000 0.000 0.000 *0.000 0.000 0.000 0.046 NNE 0.000 0.186 0.279 0.000 0.000 0.000 0.000 0.000 0.000 0.465 NE 0.000 0.093 0.093 0.000 0.000 0.000 0.000 0.000 0.000 0.186 ENE 0.000 0.046 0.046 0.000 0.000 0.000 0.000 0.000 0.000 0.093 E 0.000 0.186 0.046 0.000 0.000 0.000 0.000 0.000 0.000 0.232 ESE 0.000 0.093 0.046 0.000 0.000 0.000 0.000 0.000 0.000 0.139 SE 0.000 0.046 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.046 SSE 0.000 0.046 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.046 S 0.000 0.232 0.279 0.000 0.000 0.000 0.000 0.000 0.000 0.511 SSW 0.000 0.093 0.511 0.000 0.000 0.000 0.000 0.000 0.000 0.604 SW 0.000 0.000 0.139 0.000 0.000 0.000 0.000 0.000 0.000 0.139 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 0.046 0.000 0.000 0.000 0.000 0.046 NNW 0.000 0.046 0.000 0.046 0.000 0.000 0.000 0.000 0.000 0.093 SUBTOTAL 0.000 1.069 1.488 0.046 0.046 0.000 0.000 0.000 0.000 2.650 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2178 TOTAL HOURS OF STABILITY CLASS G 58 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS G 57 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2151 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: 2012/08/15 MEAN WIND SPEED 1.86 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS Al-15

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

SEQUOYAH NUCLEAR PLANT JUL 1, 2012 - SEP 30, 2012 WIND WIND SPEED(MPH)

DIRECTION CALM 0.6-1.4 1.5-3.4 3.5-5.4 5.5-7.4 7.5-12.4 12.5-18.4 18.5-24.4 >=24.5 TOTAL N 0.000 0.000 0.000 0.045 0.136 0.000 0.000 0.000 0.000 0.182 NNE 0.000 0.000 0.000 0.227 0.227 0.000 0.000 0.000 0.000 0.455 NE 0.D00 0.000 0.000 0.409 0.045 0.000 0.000 0.000 0.000 0.455 ENE 0.000 0.000 0.045 0.000 0.000 0.000 0.000 0.000 0.000 0.045 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 0.045 0.000 0.000 0.000 0.000 0.000 0.045 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 0.045 0.000 0.000 0.000 0.000 0.000 0.091 S 0.000 0.000 0.000 0.091 0.136 0.000 0.000 0.000 0.000 0.227 SSW 0.000 0.000 0.000 0.318 0. 637 0.045 0.000 0.000 0.000 1.000 SW 0.000 0.000 0.000 0.364 0.318 0.000 0.000 0.000 0.000 0.682 WSW 0.000 0.000 0.000 0.045 0.045 0.000 0.000 0.000 0.000 0.091 W 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 WNW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 NW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 NNW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 SUBTOTAL 0.000 0.000 0.091 1.683 1.546 0.045 0.000 0.000 0.000 3.365 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2199 TOTAL HOURS OF STABILITY CLASS A 74 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS A 74 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2199 TOTAL HOURS CALM 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: 2012/11/14 MEAN WIND SPEED = 5.34 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS Al-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 JUL 1, 2012 - SEP 30, 2012 WIND WIND SPEED(MPH)

DIRECTION CALM 0.6-1.4 1.5-3.4 3.5-5.4 5.5-7.4 7.5-12.4 12.5-18.4 18.5-24.4 >=24.5 TOTAL N 0.000 0.000 0.000 0.136 0.000 0.000 0.000 0.000 0.000 0.136 NNE 0.000 0.000 0.045 0.273 0.136 0.000 0.000 0.000 0.000 0.455 NE 0.000 0.000 0.000 0.364 0.045 0.000 0.000 0.000 0.000 0.409 ENE 0.000 0.000 0.045 0.000 0.000 0.000 0.000 0.000 0.000 0.045 E 0.000 0.000 0.091 0.000 0.000 0.000 0.000 0.000 0.000 0.091 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 0.000 0.045 0.000 0.000 0.000 0.000 0.091 S 0.000 0.000 0.000 0.091 0.227 0.000 0.000 0.000 0.000 0.318 SSW 0.000 0.000 0.045 1.501 0.500 0.000 0.000 0.000 0.000 2.046 SW 0.000 0.000 0.000 1.000 0.000 0.000 0.000 0.000 0.000 1.000 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 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 NW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 NNW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 SUBTOTAL 0.000 0.000 0.273 3.502 0.955 0.000 0.000 0.000 0.000 4.729 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2199 TOTAL HOURS OF STABILITY CLASS B 104 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS B 104 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2199 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: 2012/11/14 MEAN WIND SPEED = 4.73 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS Al-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 JUL 1, 2012 - SEP 30, 2012 WIND WIND SPEED(MPH)

DIRECTION CALM 0.6-1.4 1.5-3.4 3.5-5.4 5.5-7.4 7.5-12.4 12.5-18.4 18.5-24.4 >=24.5 TOTAL N 0.000 0.000 0.045 0.136 0.000 0.000 0.000 0.000 0.000 0.182 NNE 0.000 0.000 0.045 1.000 0.091 0.000 0.000 0.000 0.000 1.137 NE 0.000 0.000 0.182 0.318 0.000 0.000 0.000 0.000 0.000 0.500 ENE 0.000 0.000 0.136 0.045 0.000 0.000 0.000 0.000 0.000 0.182 E 0.000 0.000 0.182 0.000 0.000 0.000 0.000 0.000 0.000 0.182 ESE 0.000 0.000 0.136 0.000 0.000 0.000 0.000 0.000 0.000 0.136 SE 0.000 0.000 0.182 0.000 0.000 0.000 0.000 0.000 0.000 0.182 SSE 0.000 0.000 0.136 0.091 0.000 0.000 0.000 0.000 0.000 0.227 S 0.000 0.000 0. 136 0.136 0.182 0.000 0.000 0.000 0.000 0.455 SSW 0.000 0.000 0.227 1.819 0.364 0.000 0.000 0.000 0.000 2.410 SW 0.000 0.000 0.227 0.773 0.045 0.000 0.000 0.000 0.000 1.046 WSW 0.000 0.000 0.091 0.045 0.000 0.000 0.000 0.000 0.000 0.136 W 0.000 0.000 0.045 0.136 0.000 0.000 0.000 0.000 0.000 0.182 WNW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 NW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 NNW 0.000 0.000 0.045 0.045 0.000 0.000 0.000 0.000 0.000 0.091 SUBTOTAL 0.000 0.000 1.819 4.548 0.682 0.000 0.000 0.000 0.000 7.049 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2199 TOTAL HOURS OF STABILITY CLASS C 155 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS C 155 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2199 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: 2012/11/14 MEAN WIND SPEED 4.10 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS Al-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 JUL 1, 2012 - SEP 30, 2012 WIND WIND SPEED(MPH)

DIRECTION CALM 0.6-1.4 1.5-3.4 3.5-5.4 5.5-7.4 7.5-12.4 12.5-18.4 18.5-24.4 >=24.5 TOTAL N 0.000 0.000 1.683 0.728 0.273 0.000 0.000 0.000 0.000 2.683 NNE 0.000 0.000 1.774 0.910 0.500 0.000 0.000 0.000 0.000 3.183 NE 0.000 0.000 1.501 0.500 0.000 0.000 0.091 0.000 0.000 2.092 ENE 0.000 0.045 0.591 0.000 0.000 0.000 0.000 0.000 0.000 0.637 E 0.000 0.000 0.273 0.045 0.000 0.000 0.000 0.000 0.000 0.318 ESE 0.000 0.000 0.227 0.045 0.045 0.000 0.000 0.000 0.000 0.318 SE 0.000 0.000 0.819 0.045 0.000 0.000 0.000 0.000 0.000 0.864 SSE 0.000 0.000 1.319 0.409 0.000 0.091 0.000 0.000 0.000 1.819 S 0.000 0.000 3.411 2.365 0.182 0.000 0.000 0.000 0.000 5.957 SSW 0.000 0.091 3.502 5.230 0.273 0.000 0.000 0.000 0.000 9.095 SW 0.000 0.091 1.501 1.410 0.227 0.000 0.000 0.000 0.000 3.229 WSW 0.000 0.091 0.409 0.273 0.091 0.000 0.000 0.000 0.000 0.864 W 0.000 0.091 0.136 0.136 0.045 0.000 0.000 0.000 0.000 0.409 WNW 0.000 0.045 0.409 0.182 0.000 0.091 0.000 0. 000 0.000 0.728 NW 0.000 0.045 0.273 0.318 0.091 0.091 0.000 0.000 0.000 0.819 0.000 NNW 0.045 0.591 0.136 0.091 0.091 0.000 0.000 0.000 0.955 0.000 SUBTOTAL 0.546 18.417 12.733 1.819 0.364 0.091 0.000 0.000 33.970 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2199 TOTAL HOURS OF STABILITY CLASS D 747 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS D 747 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2199 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: 2012/11/14 MEAN WIND SPEED 3.45 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS Al-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 JUL 1, 2012 - SEP 30, 2012 WIND WIND SPEED(MPH)

DIRECTION CALM 0.6-1.4 1.5-3.4 3.5-5.4 5.5-7.4 7.5-12.4 12.5-18.4 18.5-24.4 >=24.5 TOTAL N 0.000 0.955 4.548 0.773 0.045 0.000 0.000 0.000 0.000 6.321 NNE 0.000 0. 682 3.047 0.591 0.000 0.000 0.000 0.000 0.000 4.320 NE 0.000 0.318 0.546 0.091 0.000 0.000 0.000 0.000 0.000 0.955 ENE 0.000 0.182 0.318 0.000 0.000 0.000 0.000 0.000 0.000 0.500 E 0.000 0.091 0.091 0.000 0.000 0.000 0.000 0.000 0.000 0.182 ESE 0.000 0.182 0.091 0.000 0.000 0.000 0.000 0.000 0.000 0.273 SE 0.000 0.364 0.136 0.000 0.000 0.000 0.000 0.000 0.000 0.500 SSE 0.000 0.455 0. 637 0.091 0.000 0.000 0.000 0.000 0.000 1.182 S 0.000 0.409 1.592 0.546 0.000 0.000 0.000 0.000 0.000 2.547 SSW 0.000 0.273 3.411 0.546 0.000 0.000 0.000 0.000 0.000 4.229 SW 0.000 0.227 3.683 1.364 0.182 0.091 0.000 0.000 0.000 5.548 WSW 0.000 0.182 1.683 0.409 0.091 0.000 0.000 0.000 0.000 2.365 W 0.000 0.227 0.819 0.136 0.045 0.000 0.000 0.000 0.000 1.228 WNW 0.000 0.273 0.591 0.136 0.000 0.000 0.000 0.000 0.000 1.000 NW 0.000 0.455 1 .000 0.136 0.000 0.000 0.000 0.000 0.000 1.592 NNW 0.000 0.364 1.683 0.318 0.045 0.045 0.000 0.000 0.000 2.456 SUBTOTAL 0 .000 5.639 23.874 5.139 0.409 0.136 0.000 0.000 0.000 35.198 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2199 TOTAL HOURS OF STABILITY CLASS E 774 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS E 774 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2199 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: 2012/11/14 MEAN WIND SPEED = 2.45 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS Al-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 JUL 1, 2012 - SEP 30, 2012 WIND WIND SPEED(MPH)

DIRECTION CALM 0.6-1.4 1.5-3.4 3.5-5.4 5.5-7.4 7.5-12.4 12.5-18.4 18.5-24.4 >=24.5 TOTAL N 0.000 0.455 4.002 0.682 0.045 0.000 0.000 0.000 0.000 5.184 NNE 0.000 0.773 4.047 0.045 0.000 0.000 0.000 0.000 0.000 4.866 NE 0.000 0.273 0.409 0.000 0.000 0.000 0.000 0.000 0.000 0. 682 ENE 0.000 0.227 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.227 E 0.000 0.227 0.091 0.000 0.000 0.000 0.000 0.000 0.000 0.318 ESE 0.000 0.136 0.045 0.000 0.000 0.000 0.000 0.000 0.000 0.182 SE 0.000 0.318 0.045 0.000 0.000 0.000 0.000 0.000 0.000 0.364 SSE 0.000 0.091 0.136 0.000 0.000 0.000 0.000 0.000 0.000 0.227 S 0.000 0.000 0.318 0.000 0.045 0.000 0.000 0.000 0.000 0.364 SSW 0.000 0.136 0.318 0.045 0.000 0.000 0.000 0.000 0.000 0.500 SW 0.000 0.045 0.227 0.045 0.000 0.000 0.000 0.000 0.000 0.318 WSW 0.000 0.000 0.091 0.000 0.000 0.000 0.000 0.000 0.000 0.091 W 0.000 0.045 0.273 0.045 0.000 0.000 0.000 0.000 0.000 0.364 WNW 0.000 0.000 0.227 0.000 0.000 0.000 0.000 0.000 0.000 0.227 NW 0.000 0.000 0.318 0.045 0.000 0.000 0.000 0.000 0.000 0.364 NNW 0.000 0.045 0.546 0.409 0.000 0.000 0.000 0.000 0.000 1.000 SUBTOTAL 0.000 2.774 11.096 1.319 0.091 0.000 0.000 0.000 0.000 15.280 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2199 TOTAL HOURS OF STABILITY CLASS F 336 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS F 336 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2199 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: 2012/11/14 MEAN WIND SPEED = 2.11 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS Al-21

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

SEQUOYAH NUCLEAR PLANT JUL 1, 2012 - SEP 30, 2012 WIND WIND SPEED(MPH)

DIRECTION CALM 0.6-1.4 1.5-3.4 3.5-5.4 5.5-7.4 7.5-12.4 12.5-18.4 18.5-24.4 >=24.5 TOTAL N 0.000 0.045 0. 000 0.000 0.000 0.000 0.000 0.000 0.000 0.045 NNE 0.000 0.000 0. 000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 NE 0.000 0.000 0. 000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 ENE 0.000 0.000 0. 000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 E 0.000 0.000 0. 000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 ESE 0.000 0.045 0. 000 0.000 0.000 0.000 0.000 0.000 0.000 0.045 SE 0.000 0.000 0. 000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 SSE 0.000 0.045 0. 045 0.000 0.000 0.000 0.000 0.000 0.000 0.091 S 0.000 0.045 0.045 0.000 0.000 0.000 0.000 0.000 0.000 0.091 SSW 0.000 0.000 0.000 0.045 0.000 0.000 0.000 0.000 0.000 0.045 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 0.045 0.000 0.000 0.000 0.000 0.000 0.045 WNW 0.000 0.000 0.000 0.045 0.000 0.000 0.000 0.000 0.000 0.045 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 0.182 0.091 0.136 0.000 0.000 0.000 0.000 0.000 0.409 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2199 TOTAL HOURS OF STABILITY CLASS G 9 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS G 9 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2199 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: 2012/11/14 MEAN WIND SPEED - 2.40 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS Al-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, 2012 - DEC 31, 2012 WIND WIND SPEED(MPH)

DIRECTION CALM 0.6-1.4 1.5-3.4 3.5-5.4 5.5-7.4 7.5-12.4 12.5-18.4 18.5-24.4 >=24.5 TOTAL N 0.000 0.000 0.045 0.000 0.091 0.000 0.000 0.000 0.000 0.136 NNE 0.000 0.000 0.045 0.045 0.182 0.000 0.000 0.000 0.000 0.272 NE 0.000 0.000 0.091 0.045 0.045 0.045 0.000 0.000 0.000 0.227 ENE 0.000 0.000 0.091 0.000 0.000 0.000 0.000 0.000 0.000 0.091 E 0.000 0.000 0.045 0.045 0.000 0.000 0.000 0.000 0.000 0.091 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 0.045 0.000 0.000 0.000 0.000 0.000 0.000 0.045 SSW 0.000 0.000 0.091 0.000 0.000 0.000 0.000 0.000 0.000 0.091 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 0.136 0.000 0.000 0.000 0.136 SUBTOTAL 0.000 0.000 0.454 0.136 0.318 0.182 0.000 0.000 0.000 1.090 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2202 TOTAL HOURS OF STABILITY CLASS A 24 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS A 24 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2202 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: 2013/02/19 MEAN WIND SPEED = 4.97 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS Al-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, 2012 - DEC 31, 2012 WIND WIND SPEED (MPH)

DIRECTION CALM 0.6-1.4 1.5-3.4 3.5-5.4 5.5-7.4 7.5-12.4 12.5-18.4 18.5-24.4 >=24.5 TOTAL N 0.000 0.000 0.000 0.045 0.000 0.045 0.000 0.000 0.000 0.091 NNE 0.000 0.000 0.045 0.182 0.272 0.136 0.000 0.000 0.000 0.636 NE 0.000 0.000 0.227 0.409 0.045 0.091 0.000 0.000 0.000 0.772 ENE 0.000 0.000 0.045 0.045 0.000 0.000 0.000 0.000 0.000 0.091 E 0.000 0.000 0.045 0.000 0.000 0.000 0.000 0.000 0.000 0.045 ESE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 SE 0. 000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 SSE 0.000 0.000 0.000 0.045 0.000 0.000 0.000 0.000 0.000 0.045 S 0.000 0.000 0.000 0.091 0.091 0.000 0.000 0.000 0.000 0.182 SSW 0.000 0.000 0.000 0.091 0.136 0.000 0.000 0.000 0.000 0.227 SW 0.000 0.000 0.000 0.045 0.045 0.000 0.000 0.000 0.000 0.091 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 0.091 0.045 0.000 0.000 0.000 0.136 WNW 0.000 0.000 0.000 0.000 0.091 0.091 0.000 0.000 0.000 0.182 NW 0.000 0.000 0.000 0.000 0.091 0.000 0.000 0.000 0.000 0.091 NNW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 SUBTOTAL 0.000 0.000 0.363 0.954 0.863 0.409 0.000 0.000 0.000 2.589 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2202 TOTAL HOURS OF STABILITY CLASS B 57 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS B 57 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2202 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: 2013/02/19 MEAN WIND SPEED 5.72 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS Al-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, 2012 - DEC 31, 2012 WIND WIND SPEED(MPH)

DIRECTION CALM 0.6-1.4 1.5-3.4 3.5-5.4 5.5-7.4 7.5-12.4 12.5-18.4 18.5-24.4 >=24.5 TOTAL N 0.000 0.045 0.000 0.045 0.136 0.000 0.000 0.000 0.000 0.227 NNE 0.000 0.000 0.045 0.318 0.272 0.182 0.000 0.000 0.000 0.817 NE 0.000 0.000 0.363 0.409 0.136 0.000 0.000 0.000 0.000 0.908 ENE 0.000 0.000 0.136 0.136 0.000 0.000 0.000 0.000 0.000 0.272 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 0.045 0.000 0.000 0.000 0.000 0.000 0.000 0.045 SE 0.000 0.000 0.045 0.000 0.000 0.000 0.000 0.000 0.000 0.045 SSE 0.000 0.000 0.045 0.091 0.000 0.000 0.000 0.000 0.000 0.136 S 0.000 0.000 0.045 0.136 0.136 0.000 0.000 0.000 0.000 0.318 SSW 0.000 0.000 0.000 0.136 0.272 0.000 0.000 0.000 0.000 0.409 SW 0.000 0.000 0.045 0.318 0.227 0.091 0.000 0.000 0.000 0.681 WSW 0.000 0.000 0.045 0.045 0.045 0.000 0.000 0.000 0.000 0.136 W 0.000 0.000 0.000 0.000 0.045 0.000 0.000 0.000 0.000 0.045 WNW 0.000 0.000 0.000 0.045 0.045 0.136 0.000 0.000 0.000 0.227 NW 0.000 0.000 0.000 0.045 0.091 0.045 0.000 0.000 0.000 0.182 NNW 0.000 0.000 0.000 0.000 0.045 0.136 0.000 0.000 0.000 0.182 SUBTOTAL 0.000 0.045 0.817 1.726 1.453 0.590 0.000 0.000 0.000 4.632 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2202 TOTAL HOURS OF STABILITY CLASS C 102 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS C 102 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2202 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: 2013/02/19 MEAN WIND SPEED = 5.28 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS Al-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, 2012 - DEC 31, 2012 WIND WIND SPEED(MPH)

DIRECTION CALM 0.6-1.4 1.5-3.4 3.5-5.4 5.5-7.4 7.5-12.4 12.5-18.4 18.5-24.4 >=24.5 TOTAL N 0.000 0.000 0.817 1.181 1.589 0.681 0.000 0.000 0.000 4.269 NNE 0.000 0.000 1.090 2.089 1.907 1.226 0.000 0.000 0.000 6.312 NE 0.000 0.000 0.954 0.772 0.182 0.318 0.000 0.000 0.000 2.225 ENE 0.000 0.091 0.318 0.000 0.000 0.000 0.000 0.000 0.000 0.409 E 0.000 0.045 0.182 0.000 0.000 0.000 0.000 0.000 0.000 0.227 ESE 0.000 0.045 0.091 0.000 0.000 0.000 0.000 0.000 0.000 0.136 SE 0.000 0.045 0.136 0.000 0.000 0.000 0.000 0.000 0.000 0.182 SSE 0.000 0.045 0.091 0.045 0.045 0.045 0.000 0.000 0.000 0.272 S 0.000 0.045 0.636 0.545 0.500 0.272 0.000 0.000 0.000 1.998 SSW 0.000 0.045 1.272 2.589 1.090 0.091 0.000 0.000 0.000 5.086 SW 0.000 0.045 0.908 1.408 0.817 0.272 0.000 0.000 0.000 3.451 WSW 0.000 0.045 0.091 0.091 0.091 0.091 0.045 0.000 0.000 0.454 W 0.000 0.136 0.045 0.091 0.136 0.500 0.045 0.000 0.000 0.954 WNW 0.000 0.000 0.091 0.318 0.227 0.318 0.045 0.000 0.000 0.999 NW 0 .000 0.000 0.182 0.272 0.590 0.000 0.000 0.000 0.000 1.045 NNW 0 .000 0.000 0.045 0.545 0.545 0.182 0.000 0.000 0.000 1.317 SUBTOTAL 0.000 0.590 6.948 9.946 7.720 3.996 0.136 0.000 0.000 29.337 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2202 TOTAL HOURS OF STABILITY CLASS D 646 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS D 646 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2202 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: 2013/02/19 MEAN WIND SPEED = 5.05 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS Al-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, 2012 - DEC 31, 2012 WIND WIND SPEED (MPH)

DIRECTION CALM 0.6-1.4 1.5-3.4 3.5-5.4 5.5-7.4 7.5-12.4 12.5-18.4 18.5-24.4 >=24.5 TOTAL N 0.000 0.318 2.498 1.635 0.500 0.091 0.000 0.000 0.000 5.041 NNE 0.000 0.500 2.861 1.453 1.362 0.454 0.000 0.000 0.000 6.630 NE 0.000 0.136 0.817 0.136 0.227 0.045 0.000 0.000 0.000 1.362 ENE 0.000 0.091 0.272 0.000 0.000 0.000 0.000 0.000 0.000 0.363 E 0.000 0.091 0.045 0.045 0.000 0.000 0.000 0.000 0.000 0.182 ESE 0.000 0.136 0.045 0.045 0.000 0.000 0.000 0.000 0.000 0.227 SE 0.000 0.227 0.182 0.000 0.000 0.000 0.000 0.000 0.000 0.409 SSE 0.000 0.045 0.227 0.045 0.136 0.045 0.000 0.000 0.000 0.500 S 0.000 0.227 1.544 0.772 0.817 0.590 0.000 0.000 0.000 3.951 SSW 0.000 0.318 2.361 1.998 0.681 0.318 0.000 0.000 0.000 5.677 SW 0.000 0.272 2.452 0.908 0.182 0.091 0.000 0.000 0.000 3.906 WSW 0.000 0.227 0.772 0.363 0.000 0.136 0.000 0.000 0.000 1 .499 W 0.000 0.227 0.590 0.318 0.182 0.272 0.091 0.000 0.000 1.680 WNW 0.000 0.045 0.318 0.409 0.182 0.091 0.000 0.000 0.000 1 .045 NW 0.000 0.363 0.454 0.727 0.409 0.272 0.000 0.000 0.000 2.225 NNW 0.000 0.272 0.908 0.590 0.409 0.272 0.000 0.000 0.000 2.452 SUBTOTAL 0.000 3.497 16.349 9.446 5.086 2.679 0.091 0.000 0.000 37.148 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2202 TOTAL HOURS OF STABILITY CLASS E 818 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS E 818 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2202 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: 2013/02/19 MEAN WIND SPEED = 3.81 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS Al-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, 2012 - DEC 31, 2012 WIND WIND SPEED (MPH)

DIRECTION CALM 0.6-1.4 1.5-3.4 3.5-5.4 5.5-7.4 7.5-12.4 12.5-18.4 18.5-24.4 >=24.5 TOTAL N 0.000 0.272 1 .589 0.136 0.000 0.000 0.000 0.000 0.000 1.998 NNE 0.000 0.727 5. 904 0.272 0.000 0.000 0.000 0.000 0.000 6.903 NE 0.000 0.727 1.726 0.136 0.045 0.000 0.000 0.000 0.000 2.634 ENE 0.000 0.272 0.182 0.000 0.000 0.000 0.000 0.000 0.000 0.454 E 0.000 0.454 0.045 0.000 0.000 0.000 0.000 0.000 0.000 0.500 ESE 0.000 0.227 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.227 SE 0.000 0.182 0.045 0.000 0.000 0.000 0.000 0.000 0.000 0.227 SSE 0.000 0.091 0.091 0.000 0.000 0.000 0.000 0.000 0.000 0.182 S 0.000 0.409 0.363 0.000 0.045 0.045 0.000 0.000 0.000 0.863 SSW 0.000 0.272 0. 636 0.182 0.045 0.000 0.000 0.000 0.000 1 .135 SW 0.000 0.136 0.772 0.000 0.000 0.045 0.000 0.000 0.000 0. 954 WSW 0.000 0.091 0.318 0.000 0.000 0.000 0.000 0.000 0.000 0.409 W 0.000 0.000 0.182 0.000 0.000 0.000 0.000 0.000 0.000 0.182 WNW 0.000 0.000 0.091 0.000 0.000 0.000 0.000 0.000 0.000 0.091 NW 0.000 0.045 0.500 0.136 0.000 0.000 0.000 0.000 0.000 0.681 NNW 0.000 0.000 0.409 0.136 0.045 0.000 0.000 0.000 0.000 0.590 SUBTOTAL 0.000 3.906 12.852 0.999 0.182 0.091 0.000 0.000 0.000 18.029 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2202 TOTAL HOURS OF STABILITY CLASS F 397 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS F 397 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2202 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: 2013/02/19 MEAN WIND SPEED = 2.14 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS Al-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, 2012 - DEC 31, 2012 WIND WIND SPEED (MPH)

DIRECTION CALM 0.6-1.4 1.5-3.4 3.5-5.4 5.5-7.4 7.5-12.4 12.5-18.4 18.5-24.4 >=24.5 TOTAL N 0.001 0.045 0.091 0.000 0.000 0.000 0.000 0.000 0.000 0.137 NNE 0.008 0.227 0.954 0.000 0.000 0.000 0.000 0.000 0.000 1.188 NE 0.012 0.590 1.272 0.000 0.000 0.000 0.000 0.000 0.000 1.874 ENE 0.003 0.363 0.045 0.000 0.000 0.000 0.000 0.000 0.000 0.411 E 0.002 0.363 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.366 ESE 0.001 0.136 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.137 SE 0.001 0.136 0.045 0.000 0.000 0.000 0.000 0.000 0.000 0.183 SSE 0.003 0.454 0.091 0.000 0.000 0.000 0.000 0.000 0.000 0.548 S 0.003 0.363 0.182 0.000 0.000 0.000 0.000 0.000 0.000 0.548 SSW 0.008 0.409 0.817 0.000 0.000 0.000 0.000 0.000 0.000 1 .234 SW 0.003 0.045 0.363 0.000 0.000 0.000 0.000 0.000 0.000 0.411 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 0.045 0.000 0.000 0.000 0.000 0.000 0.045 WNW 0.000 0.045 0.000 0.000 0.000 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 0.045 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.046 SUBTOTAL 0.045 3.224 3.860 0.045 0.000 0.000 0.000 0.000 0.000 7.175 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2202 TOTAL HOURS OF STABILITY CLASS G 158 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS G 158 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2202 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: 2013/02/19 MEAN WIND SPEED = 1.70 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS Al-29

Attachment 2.0 Deviations from ODCM Controls/Surveillance Requirements Date ODCM Description of Deviation Requirement December 27, 2012 1/2 1.2 2.1.2 During the performance of Chemistry Technical Instruction Table 1.1-2 0-SI-CEM-030-415.0, Gaseous Effluent Requirements (Noble Item 3a, Gas and Tritium) for Inoperable Monitor, and 2-SI-CEM 090-470.4, Unit 2 Shield Building Flow Estimation, Chemistry personnel missed a 12 hour1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> sample requirement and a 4 hour4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> flow check requirement. The sample and flow check were performed 2.58 hours6.712963e-4 days <br />0.0161 hours <br />9.589947e-5 weeks <br />2.2069e-5 months <br /> late.

PER 666556.

December 31, 2012 1/2 1.2 2.1.2 During the performance of Chemistry Technical Instruction Table 1.1-2 2-SI-CEM 090-470.4, Unit 2 Shield Building Flow Estimation, Item 3a, Chemistry personnel missed a 4 hour4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> flow check requirement.

The flow check was performed 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> late.

PER 662785 A2-1

Attachment 3.0 Radiation Monitors Inoperable for Greater than 30 days Date Description of Inoperability June 11, 2012 Unit 1 Shield Building Exhaust System Radiation Monitor, 1-RM-90-400, was declared inoperable on June 11, 2012 due to inoperable Kurz system. It was removed from service to replace sampling pumps. The Kurz system allows Monitor operation in the mid and high ranges. The Monitor still maintains low range detection functions. DCN 22960 will replace the broken and obsolete Kurz equipment. It has not been returned to operability.

October 19, 2012 Unit 2 Shield Building Exhaust System Radiation Monitor, 1-RM-90-400, was declared inoperable on October 19, 2012.

It had been removed from service to perform scheduled maintenance. The instrument failed its leak check on return to service and was made inoperable. Engineering contacted the vendor for assistance and parts. It was returned to operability on January 26, 2012.

A3-1

Attachment 4.0 Addendum Annual ReDort I DescriDtion of Addendum 2011 Contribution of Tritium to the Gaseous Activities and Dose due to operation of the Unit 1 and 2 Steam Generator Power Operated Relief Valves was not reported in the 2011 Annual Radioactive Effluent Release Report. There was no Gamma activity contributed by these operations.

These operations occured.

April 3, 2011, Ul S/G #2 indicated opened with an estimated release of 2.45E-4 Ci.

June 26, 2011, U1 S/G #1-4 indicated opened with an estimated release of 8.82E-4 Ci.

May, 23 through June,20 2011, for U2C17, U2 S/G #1-4 were opened with an estimated release of 5.38E-4 Ci.for the shut down and 9.18E-4 Ci for the start-up.

July 20, 2011, Ul S/G #2, 3 and 4 indicated opened with an estimated release of 8.29E-4 Ci.

Adding these values to the previously reported totals showed no increase in the reported dose This is to report and correct this omissiom in the 2009 Annual Radioactive Effluent Release Report. This does not affect the reported dose.

A4-1

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