Text

Annual Radioactive Effluent Release Rept for Period of Jan-Dec 1997
	ML20217F089
Person / Time
Site:	Sequoyah
Issue date:	12/31/1997
From:	; TENNESSEE VALLEY AUTHORITY
To:	;
Shared Package
ML20217F075	List: ML20217F070; ML20217F089;
References
	NUDOCS 9804280050
	Download: ML20217F089 (75)
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ENCLOSUREI ANNUAL RADIOACTIVE EFFLUENT RELEASE REPORT 1

FOR Tile PERIOD OF JANUARY I TO DECEMBER 31,1997 I

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l 9804280050 980422 PDR ADOCK 05000327 R PDR

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EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT SUPPLEMENTAL INFORMATION 1997

1. 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. lodine-131, iodine-133, tritium, and all radionuclides in particulate form with half-lives greater than 8 days:

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

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

a. Less than or equal to 5 mrad for gamma radiation and less than or equal to 10 mrad for beta radiation during any calendar quarter,

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

3. Dose to a member of the public from iodine-131, loc:ae-133, tritium, and all 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.

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EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT SUPPLEMENTAL INFORMATION ,

1997 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, 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 2.0 E-04 microcuries/ milliliter (pCi/ml) total activity.

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

2. EFFLUENT CONCENTRATION LIMITS A. Liquids I

1. The Effluent Concentration Limits (ECL) for liquids are those listed in l 10 CFR 20, Appendix B, Table 2, Column 2. For dissolved and l entrained gases the ECL of 2.0E-04 pCi/ml is applied. This ECL is j based on the 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.

l l B. Gaseous

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

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

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

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

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EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT SUPPLEMENTAL INFORMATION 1997

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

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

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

3. AVERAGE ENERGY Sequoyah'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. Therefore, the average beta and gamma energies (E) for gaseous effluents as described in Regulatory Guide 1.21,

" Measuring, Evaluation, and Reporting Radioactivity in Solid Wastes and Releases of Radioactive Materials in Liquid and Gaseous Effluents from Light-Water-Cooled Nuclear Power Plants," are not applicable.

4. MEASUREMENTS AND APPROXIMATIONS OF TOTAL RADIOACTIVITY NOTE: Every effort is made to ensure that effluent releases from Sequoyah are conducted such that all Offsite Dose Calculation Manual (ODCM) Lower Limit of Detection (LLD) values are met. Whenever an analysis does not ,

identify a radioisotope, a "0.00E-01 Ci"is recorded for the release. This i 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 buildirg, auxiliary building, service building, and condenser vacuum exhausts are tt. ken and analyzed at least monthly to determine the quantity of noble gas activity released for the month i based on the average vent flowrates recorded for the sample period. Also, l noble gas samples are collected and evaluated for the shield and auxilmry i buildings following startup, shutdown, or rated thermal power change I exceeding 15 percent within one hour (sampling only required if dose l equivalent 1-131 concentration in the primary coolant or the noble gas activity l monitor shows that the containment activity has increased more than a factor i of 3).

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EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT SUPPLEMENTAL INFORMATION 1997 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 all of the activity released from each vent for all sampling periods.

B. lodines and Particulates lodine 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 flowrates recorded for sampling period.

Also, particulate and charcoal samples are taken from the auxiliary and shield building exhausts once per 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months for 2 days following startup, shutdown, or )

i a rated thermal power change exceeding 15 percent within one hour. The )

l quantity of iodine and particulate released from each vent during each sampling period is then determined using the average vent flowrates recorded for the sampling period and activity concentration.

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

C. Liquid Effluents l 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.

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

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1 EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT -

SUPPLEMENTAL INFORMATION 1997 4

Total gamma isotopic activity concentration is determined daily on a composite sample from the condensate system and turbine building sump and

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weekly for steam generator blowdown. The total activity of the continuous (

release is determined by summing each nuclide's concentration and multiplying by the total volume discharged. The total activity released during the month is then determined by summing the activity content of each daily and weekly composite for the month.

5. BATCH Value .

1st 2nd Half Half Units A. Liquid (Radwaste only) *

1. Number of releases 205 126 Each

2. Total time period of releases 26,290 16,940 Minutes

3. Maximum time period of release 469 197 Minutes ,

4. Average time period of releases 128 135 Minutes

5. Minimum time period for release 53 75 Minutes

6. Average dilution stream flow during 48,861 28,947 CFS release periods - cubic feet /second (CFS)

B. Gaseous (Batches only, containment purges, containment vents, and waste decay tanks)

1. Number of releases 52 98 Each

2. Total time period of releases 40,420 54,130 Minutes

3. Maximum time period for release 3,592 2,949 Minutes

4. Average time period for releases 777 552 Minutes

5. Minimum time period for release 32 5 Minutes i

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EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT SUPPLEMENTAL INFORMATION 1997 ,

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6. ABNORMAL RELEASES Value 1st 2nd' Half Half Units A. Liquid l Number of Releases 1 0 l Total Activity Released 8.73E-02 0.00E01 Ci B. Gaseous )

Number of Releases 1 0 Total Activity Released 1.19E-04 0.00E-01 Ci l

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I EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT 1997 LIQUID EFFLUENTS - SUMMATION OF ALL RELEASES A. Fission and .h1 M M @

Activation Products Ug1 _QlC Qlt Qlt Q1C % Error

1. Total Released Curies 2.09E-01 3.41 E-01 1.92E-01 2.25E-01 11.8E+01

2. Average Diluted Period of All Ci/ml 3.13E-07 6.52E-07 4.30E-07 1.60E-06 Identified

~3. Percent of % 2.60E-01 6.04E-01 1.53E+00 2.63E+00 Applicable Limit (ECL510)

NOTE Percent of applicable limit is based on identified isotope concentration after dilution, related to their appropriate ECL concentration and sum of all the isotope fractions compared to 10.0.

B. Tritium

1. Total Released Curies 5.53E+02 3.45E+02 5.13E+02 1.48E+02 51.8E+01

2. Average Diluted Period Ci/mi 8.29E-04 6.60E-04 1.15E-03 1.05E-03

3. Percent of Applicable % 8.29E+00 6.60E+00 1.15E+01 1.05E+01 Limit j

(1.0E-02 uCi/ml)

C. Dissolved and Entrained Gases

1. Total Released Curies 2.47E-02 1.39E-01 9.62E-01 4.27E-01 13.9E+01

2. Average Diluted Period Ci/mi 3.70E-08 2.66E-07 2.16E-06 3.03E-06

3. Percent of Applicable % 1.85E-02 1.33E-01 1.08E+00 1.52E+00 Limit (2.0E-04 Ci/ml)

D. Gross Aloha

1. Total Released Curies 0.00E-01 0.00E-01 0.00E-01 0.00E-01 52.0E+01 E. Volume of Waste Released Liters 8.10E+06 6.12E+06 5.31 E+06 1.80E+06 14.0E+00

, F. Volume of Dilution Water for Period Liters 6.59E+08 5.17E+08 4.41 E+08 1.39E+08 51.1E+01 l

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EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT 1997 LIQUID EFFLUENTS - TOTAL PLANT DISCHARGE G. Nuclide Summarv (Note: Refer to Table A for ODCM nuclides reported as 0.00E-01)

Required by ODCM/Others Fission and Activation Products Continuous Mode Batch Mode Quarter Quarter Quarter Quarter Nuclide V.011 1st 2nd 1st 2nd

1. Strontium-89 Ci 0.00E-01 0.00E-01 0.00E-01 0.00E-01 1

2. Strontium-90 Ci 0.00E-01 0.00E-01 0.00E-01 0.00E-01

3. Iron-55 Cl 0.00E-01 0.00E-01 4.03E-02 1.44E-02

4. Manganese-54 Ci 0.00E-01 0.00E-01 1.18E-03 4.01 E-03 l

S. Cobalt 58 Cl 0.00E-01 0.00E-01 9.41E-02 2.35E-01

6. Iron-59 Ci 0.00E-01 0.00E-01 1.04E-05 2.70E-04

7. Cobalt-60 Cl 0.00E-01 0.00E-01 1.83E-02 1.07E-02

8. Zinc-65 Cl 0.00E-01 0.00E-01 0.00E-01 3.16E-05

9. Molybdenum-99 Ci 0.00E-01 0.00E-01 2.13E-05 3.46E-05 l

10. lodine-131 Ci 0.00E-01 0.00E-01 1.57E-03 3.43E-04

11. Cesium-134 Ci 0.00E-01 0.00E-01 6.01E-04 4.59E-03

12. Cesium-137 Ci 0.00E-01 0.00E-01 9.26E-04 6.62E-03

13. Cerium-141 Ci 0.00E-01 0.00E-01 6.01 E-06 2.48E-05 l

14. Cerium-144 Cl 0.00E-01 0.00E-01 0.00E-01 0.00E-01 l

15. Antimony 125 Cl 0.00E-01 0.00E-01 3.74E-02 4.00E-02

16. Cobalt-57 Cl 0.00E-01 0.00E-01 8.03E-04 8.47E-04 l 17. Chromium-51 Cl 0.00E-01 0.00E-01 5.68E-04 3.91 E-03 l

18. Niobium-95 Ci 0.00E-01 0.00E-01 7.91 E-04 1.05E-03 i

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EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT 1997 LIQUID EFFLUENTS - TOTAL PLANT DISCHARGE Continuous Mode Batch Mode Quarter Quarter Quarter Quarter Nuchde kl.D.il 1st 2nd 1st 2nd

19. lodine-133 Ci 0.00E-01 0.00E-01 4.70E-04 5.14E-05 20 Zirconium-95 Cl 0.00E-01 0.00E-01 1.35E-03 1.23E-03

21. Technetium-99m Cl 0.00E-01 0.00E-01 2.13E-05 3.46E-05

22. Strontium-91 Cl 0.00E-01 0.00E-01 1.02E-05 0.00E-01

23. Tellurium-132 Cl 0.00E-01 0.00E-01 0.00E-01 9.25E-05

24. Antimony-124 Cl 0.00E-01 0.00E-01 7.12E-03 9.54E-03

25. Lanthanum-140 Cl 0.00E-01 0.00E-01 1.41 E-05 2.44E-04

26. Sodium-24 Cl 0.00E-01 0.00E-01 8.89E-05 1.23E-04

27. Rubidium-86 Ci 0.00E-01 0.00E-01 1.05E-04 0.00E-01 l

28. Silver-110m Cl 0.00E-01 0.00E-01 1.08E-03 2.59E-04 l

29. Nickel-65 Ci 0.00E-01 0.00E-01 2.82E-05 0.00E-01

30. Cesium-138 Ci 0.00E-01 0.00E-01 4.63E-05 3.20E-05

31. lodine-132 Ci 0.00E-01 0.00E-01 0.00E-01 3.01 E-04

32. Barium-139 Cl 0.00E-01 0.00E-01 0.00E-01 2.70E-05

33. Barium-140 Ci 0.00E-01 0.00E-01 0.00E-01 1.94E-04

34. Tin-113 Ci 0.00E-01 0.00E-01 1.10E-04 2.02E-05 1

35. Tellurium-129m Cl 0.00E-01 0.00E-01 1.48E-03 1.69E-03

36. Rubidium-89 Ci 0.00E-01 0.00E-01 0.00E-01 2.70E-05 Total for Period Cl 0.00E-01 0.00E-01 2.09E-01 3.41E-01 I

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i EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT 1997 LIQUID EFFLUENTS - TOTAL PLANT DISCHARGE G. Nuclide Summarv (Note: Refer to Table A for ODCM nuclides reported as 0.00E-01)

Required by ODCM/Others Dissolved and Entrained Noble Gases Continuous Mode Batch Mode Quarter Quarter _Q.uarter Quarter Nuclide Unit 1st 2nd 1st 2nd 1

1. Krypton-87 Ci 0.00E-01 0.00E-01 0 00E-01 0.00E-01

2. Krypton-88 Cl 0.00E-01 0.00E-01 8.53E-06 1.99E-05

3. Xenon-133 Ci 0.00E-01 0.00E-01 1.98E-02 1.34E-01,

4. Xenon-133m Ci 0.00E-01 0.00E-01 1.33E-04 3.65E-04 S. Xenon-135 Cl 0.00E-01 0.00E-01 4.70E-03 6.91 E-04

6. Xenon-138 Ci 0.00E-01 0.00E-01 0.00E-01 0.00E-01 l

7. Krypton-85m Ci 0.00E-01 0.00E 01 0.00E-01 0.00E-01

8. Xenon-131m Ci 0.00E-01 0.00E-01 0.00E-01 3.48E-03

9. Xenon-135m Cl 0.00E-01 0.00E-01 1.71 E-05 0.00E-01 I

10. Krypton-85 Ci 0.00E-01 0.00E-01 0.00E-01 0.00E-01 I

11. Argon-41 Ci 0.00E-01 0.00E-01 3.78E-06 3.20E-05 Total for Period Ci 0.00E-01 0.00E-01 2.47E-02 1.39E-01 I

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EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT 1997 LIQUID EFFLUENTS - TOTAL PLANT DISCHARGE G. Nuclide Sum.glgy(Note: Refer to Table A for ODCM nuclides reported as 0.00E-01)

Required by ODCM/Others Fission and Activation Products Continuous Mode Batch Mode Quader Quader Quader Quader Nuclide .Qrdt 3rd 4th 3rd 4th

1. Strontium-89 Ci 0.00E-01 0.00E-01 0.00E-01 0.00E-01

2. Strontium-90 Ci 0.00E-01 0.00E-01 0.00E-01 0.00E 01

3. Iron-55 Ci 0.00E-01 0.00E-01 2.76E-02 4.86E-03

4. Manganese-54 Ci 0.00E-01 0.00E-01 2.35E-03 5.64E-03

5. Cobalt-58 Ci 0.00E-01 0.00E-01 4.08E-02 7.17E 02

6. Iron-59 Ci 0.00E-01 0.00E-01 5.13E-05 1.07E-03

7. Cobalt-60 Ci 0.00E-01 0.00E-01 4.24E-02 7.89E-02

8. Zinc-65 Ci 0.00E-01 0.00E-01 8.58E-05 2.19E-04

9. Molybdenum 99 Ci 0.00E-01 0.00E-01 3.83E-04 1.10E-05

10. lodine-131 Ci 0.00E-01 0.00E-01 5.10E-03 6.44E-04

11. Cesium-134 Ci 6.55E-06 0.00E-01 1.87E-02 6.58E-04 l

l 12. Cesium-137 Cl 8.17E-06 0.00E-01 2.36E-02 1.13E-03 j l 13. Cerium-141 Cl 0.00E-01 0.00E-01 0.00E-01 0.00E-01 1

14. Cerium-144 Cl 0.00E-01 0.00E-01 0.00E-01 0.00E-01 l 15. Antimony-125 Ci 0.00E-01 0.00E-01 1.57E-02 1.10E-02

16. Cobalt-57 Ci 0.00E-01 0.00E-01 4.56E-04 6.66E-04 1

l 17. Chromium-51 Ci 0.00E-01 0.00E-01 1.75E-03 1.05E-02 ,

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18. Niobium-95 Ci 0.00E-01 0.00E-01 2.60E-03 1.20E-02

19. lodine-133 Ci 0.00E-01 0.00E-01 1.53E-03 0.00E-01

20. t conium-95 Ci 0.00E-01 0.00E-01 1.13E-03 4.90E-03

21. Technetium-99m Cl 0.00E-01 0.00E-01 3.83E-04 1.10E-05 11

T EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT 1997 LIQUID EFFLUENTS - TOTAL PLANT DISCHARGE

, . Continuous Mode Batch Mode j Quar 1er Quarter Quarter Quarter r

Und! 3rd 4th 3rd 4th l Nuchde I

l 22. Bromine-84 Ci 0.00E-01 0.00E-01 9.29E-06 0.00E-01

23. Antimony-124

( Ci 0.00E-01 0.00E-01 1.12E-03 1.19E-03 24 Lantnanum-140 Ci 0.00E-01 0.00E-01 2.03E-04 8.61E-04 25 Sodium-24 Ci 0.00E-01 0.00E-01 0.00E-01 3.30E-06 l

26. Cesium-136 Ci 0.00E-01 0.00E-01 4.08E-04 0.00E-01 l 27. Silver-110m Ci 0.00E-01 0.00E-01 5.42E-03 1.74E-02 l 28. lodine-135 Ci 0.00E-01 0.00E-01 1.06E-04 0.00E-01

29. Rubidium-86 Ci 0.00E-01 0.00E-01 6.67E-05 0.00E-01

30. Tin-113 Cl 0.00E-01 0.00E-01 2.34E-04 1.12E-03 l

31. Strontium-91 Ci 0.00E-01 0.00E-01 1.62E-05 0.00E-01

32. lodine -132 Ci 0.00E ' O.00E-01 0.00E-01 2.97E-05 -

33. Ruthenium-103 Ci 0.00Er 0.00E-01 0.00E-01 9.77E-06

34. Tellurium 132 Cl 0.00E-01 0.00E-01 0.00E-01 8.13E-05 l

! Total for Period Cl 1.47E-05 0.00E-01 1.92E-01 2.25E-01 j I

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I l EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT 1997 LIQUID EFFLUENTS - TOTAL PLANT DISCHARGE G. Nuclide Summarv(Note: Refer to Table A for ODCM nuclides reported as 0.00E-01)

Required by ODCM/Others Dissolved and Entrained Noble Gases Continuous Mode Batch Mode Quader Quader Quader Quader Nuctide Maj.1 3rd 4th 3rd 4th

1. Krypton-87 Ci 0.00E-01 0.00E-01 0.00E-01 0.00E-01 i l

2. Krypton-8tl Ci 0.00E-01 0.00E-01 0.00E-01 0.00E-01 l

3. Xenon-133 Cl 0.00E-01 0.00E-01 9.18E-01 4.15E 01

4. Xenon-133m Ci 0.00E-01 0.00E-01 6.73E-03 2.09E-03

5. Xenon 135 Ci 0.00E-01 0.00E-01 3.97E-03 7.65E-04 1

0. Xenon-138 Cl 0.00E-01 0.00E-01 0.00E-01 0.00E-01 l

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7. Krypton-85m Cl 0.00E-01 0.00E-01 2.16E-06 0.00E-01 !

8. Xenon-131m Ci 0.00E-01 0.00E-01 2.06E-02 9.16E-03

9. Xenon-135m Ci 0.00E-01 0.00E-01 0.00E-01 2.90E-05

10. Krypton-85 Cl 0.00E-01 0.00E-01 1.26E-02 0.00E-01

11. Argon-41 Ci 0.00E-01 0.00E-01 1.46E-05 5.08E-05 Total for Period Ci 0.00E-01 0.00E-01 9.62E-01 4.27E-01 l

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EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT 1997 TABLE A LIQUID " TYPICAL LLD" EVALUATION")

ht*

Nuckde ODCM LLD 1 hr 8 hr 32 hr Manganese-54 5.0E-07 3.36E-08 3.36E-08 3.37E-08 Cobalt-58 5.0E-07 2.53E-08 2.54E-08 2.56E-08 fron-59 5.0E-07 5.26E-08 5.29E-08 5.37E-08 ,

1 Cobalt-60 5.0E-07 4.63E-08 4.63E-08 4.64E-08 Zinc-65 5.0E-07 2.95E-08 2.95E-08 2.96E-08 Molybdenum-99 5.0E-07 1.55E-07 1.67E-07 2.15E-07 Cesium-134 5.0E-07 1.91 E-08 1.91 E-08 1.92E-08 Cesium-137 5.0E 07 3.87E 08 3.87E-08 3.87E-08 Cerium-141 5.0E-07 2.80E-08 2.81E-08 2.87E-08 Cerium-144 5.0E-06 1.11E-07 1.12E-07 1.12E-07 lodine-131 1.0E-06 2.28E-08 2.34E-08 2.55E-08 Krypton-87 1.0E-05 1.16E-07 5.25E-07 (3)

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

Xenon-133 1.0E-05 4.19E-08 4.36E-08 4.98E-08 i I

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

Nuclide ODCM LLD Tvcical LLD Tritium 1.0E-05 1.2E-06 Gross Alpha 1.0E-07 2.0E-08 Strontium-89/90 5.0E-08 3.8E-08/1.4E-08 Iron-55 1.0E-06' 1.3E-08 NOTES. (1) LLD values are in pCi/mi.

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

(3) T 1/2 too short.

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l EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT l

192Z l GASEOUS EFFLUENTS - SUMMATION OF ALL RELEASES l

(GROUND LEVEL RELEASES) i-l Summation of All 1s1 2pA ard flu Releases MDil QtE Q1r QtE QE % Error A. Noble Gases

1. Total Released Ci 1.01 E+01 3.00E+01 2.14E+02 3.63E+02 11.1 E+01

2. Average Release Rate of Period Cl/sec 1.30E+00 3.82E+00 2.69E+01 4.57E+01

3. Percent of Limit % 1.79E-03 2.07E-03 1.22E-02 2.14E-02 B. lodines

1. Totallodine-131 Cl 0.00E-01 1.29E-06 0.00E-01 5.88E-05 11.3E+01

2. Average Release Rate for Period Ci/sec 0.00E-01 1.64E-07 0.00E-01 7.40E-06

3. Percent of Limit (3.78E-01 Ci/sec) % 0.00E-01 4.34E-05 0.00E-01 1.96E-03 C. Particulates

1. Particulates with half-lives >8 days Cl 5.70E 06 8.59E-06 0.00E-01 5.14E-06 11.6E+01

2. Average Release Rate for Period Ci/sec 7.33E-07 1.09E-06 0.00E-01 6.47E-07

3. Percent of Limit % 9.01E-07 1.34E-06 0.00E-01 7.94E-07

4. Gross Alpha Radio-activity Ci 0.00E-01 0.00E-01 0.00E-01 0.00E-01 12.1E+01 D. Tritium

1. Total Release Ci 6.93E+00 6.96E+00 2.02E+01 1.12E+01 11.5E+01

2. Average Release Rate for Period Ci/ser. 8.91E-01 8.85E-01 2.54E+00 1.41 E+00

3. Percent of Limit (6.26E+04 Cl/sec) 1.42E 1.41 E-03 4.06E-03 2.25E-03 I

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EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT 1991.

GASEOUS EFFLUENTS - SUMMATION OF ALL RELEASES i (GROUND LEVEL RELEASES)

1. Noble Gases I

i Required by ODCM/Others Continuous Mode Batch Mode

, Quarter Quarter Quader Quarter Nuclide Qnit 1st 2nd 1st 2nd

1. Krypton-87 Ci 2.22E-03 0.00E-01 0.00E-01 0.00E-01

2. Krypton-88 Ci 7.74E-03 0.00E-01 7.80E-03 0.00E-01

3. Xenon-133 Cl 2.21 E-02 9.81 E+00 9.01 E+00 1.92E+01 l 4. Xenon-133m Cl 0.00E-01 0.00E-01 8.16E-03 2.19E-01

5. Xenon-135 Ci 2.65E-02 9.28E-02 1.10E-01 2.15E-01

! 6. Xenon-138 Ci 0.00E-01 0.00E-01 0.00E-01 0.00E-01 l

7. Krypton-85 Cl 0.00E-01 0.00E-01 6.55E-02 7.69E-02 i

8. Argon-41 Cl 1.08E-01 0.00E-01 6.63E-01 2.87E-01

9. Krypton-85m Ci 1.23E-03 0.00E 01 1.29E-03 1,13E-02

10. Xenon-131m Ci 0.00E 01 0.00E-01 5.26E-02 1.25E-01

11. Xenon-135m Ci 4.86E-03 0.00E-01 0.00E-01 0.00E-01 l Total for Period Cl 1.73E-01 9.90E+00 9.92E+00 2.01 E+01

2. lodines

1. lodine-131 Ci 0.00E-01 1.29E-06

2. lodine-132 Ci 0.00E-01 3.87E-07

3. lodine-135 Ci 0.00E-01 0.00E-01 Total for Period Ci 0.00E-01 1.68E-06 NOTE Refer to Table B for ODCM nuclides reported as 0.00E-01.

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EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT 19.9Z GASEOUS EFFLUENTS - SUMMATION OF ALL RELEASES (GROUND LEVEL RELEASES)

3. Particulates l

l Required by ODCM/Others Coritinuous Mode Quarter Quarter Nuclide .Vuit 1st 2nd

1. Strontium-89 Cl 0.00E-01 0.00E-01

2. Strontium-90 Cl 0.00E-01 0.00E-01

3. Iron-59 Cl 0.00E-01 0.00E-01

4. Cobalt-60 Ci 0.00E-01 0.00E-01

5. Zinc-65 Ci 0.00E-01 0.00E-01

6. Manganese-54 Ci 0.00E-01 0.00E-01 1

7. Cobalt-58 Ci 5.69E-06 8.59E-06 l

8. Molybdenum-99 Ci 0.00E-01 0.00E-01 i l

9. Cesium-134 Cl 0.00E-01 0.00E-01 j

10. Cesium-137 Ci 0.00E-01 0.00E-01

11. Cerium-141 Cl 0.00E-01 0.00E-01 1

12. Cerium-144 Ci 0.00E-01 0.00E-01 i

Total for Period Ci 5.69E-06 8.59E-06 NOTE Refer to Table B for ODCM nuclides reported as 0.00E-01.

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EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT 1R91 GASEOUS EFFLUENTS - SUMMATION OF ALL RELEASES f (GROUND LEVEL RELEASES)

1. Noble Gases Required by ODCM/Others Continuous Mode Batch Mode Quader Quader Quader Quader Nuclide .Qpit 3rd 4th 3rd 4th

1. Krypton-87 Ci 0.00E-01 0.00E-01 0.00E-01 0.00E-00

2. Krypton-88 Ci 2.83E-03 5.88E-05 4.03E-02 2.91 E-01

3. Xenon-133 Cl 1.41 E+00 9.69E+00 2.03E+02 3.35E+02

4. Xenon-133m Ci 0.00E-01 0.00E-01 1.80E+00 4.03E+00

5. Xenon-135 Ci 3.37E-03 5.38E-03 1.69E+00 4.50E+00

6. Xenon-138 Cl 0.00E-01 0.00E-01 0.00E-01 0.00E-01

7. Krypton-85 Cl 0.00E-01 0.00E-01 7.59E-01 7.19E-01

8. Argon-41 Ci 0.00E-01 0.00E-01 5.53E-01 7.16E-01

9. Krypton-85m Ci 0.00E-01 0.00E-01 1.61 E-01 2.46E-01

10. Xenon-131m Ci 0.00E-01 0.00E-01 4.24E+00 7.00E+00

11. Xenon-135m Ci 0.00E-01 0.00E-01 0.00E-01 0.00E-01 Total for Period Cl 1.42E+00 9.69E+00 2.12E+02 3.53E+02

2. fodines

1. lodine-131 Ci 0.00E-01 5.88E-05

2. lodine-133 Ci 0.00E-01 0.00E-01

3. lodine-135 Cl 0.00E-01 0.00E-01 i i

Total for Period Cl 0.00E-01 5.88E 05 l

NOTE Refer to Table B for ODCM nuclides reported as 0.00E-01.

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EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT 19.91 GASEOUS EFFLUENTS - SUMMATION OF ALL RELEASES (GROUND LEVEL RELEASES)

3. Particulates Required by ODCM/Others Continuous Mode Quarter Quarter Nuclide _VD.ij i 3rd 4th j

1. Strontium-89 Ci 0.00E-01 0.00E-01

2. Strontium-90 Cl 0.00E-01 0.00E-01 l

3. Iron-59 Ci 0.00E-01 0.00E-01

4. Cobalt-60 Ci 0.00E-01 0.00E-01

5. Zinc-65 Ci 0.00E-01 0.00E-01

6. Manganese-54 Ci 0.00E-01 0.00E-01

7. Cobalt-58 Ci 0.00E-01 5.14E-06

8. Molybdenum-99 Ci 0.00E-01 3.70E-06

9. Cesium-134 Ci 0.00E-01 0.00E-01

10. Cesium-137 Ci 0.00E-01 0.00E-01

11. Cerium-141 Ci 0.00E-01 0.00E-01

12. Cerium-144 Cl 0.00E-01 0.00E-01

13. Niobium-95 Cl 0.00E-01 0.00E-01

14. Techetium-99m Cl 0.00E-01 3.70E-06 Total for Period Ci 0.00E-01 1.25E-05 NOTE Refer to Table B for ODCM nuclides reported as 0.00E-01.

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n EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT 1997 TABLE B GASEOUS " TYPICAL" LLD EVALUATIO@

Noble Gas ga) l

! Nuclide ODCM LLD 1 hr 1.5 hr Krypton-87 1.0E-04 2.08E-06 2.73E-06 I Krypton-88 1.0E-04 1.61 E-06 1.81 E-06 Xenon-133 1.0E-04 6.61 E-07 6.63E-07 l

Xenon-133m 1.0E-04 2.34E-06 2.35E-06 Xenon-135 1.0E-04 3.43E-07 3.56E-07 Xenon-138 1.0E-04 1.40E-04 6.10E-04 l

Particulate Samold') 1 hL , 24 hr 7.0da Manganese-54 1.0E-10 7.47E-12 3.12E-13 4.48E-14 Cobalt-58 1.0E-10 5.62E-12 2.35E-13 3.46E-14 fron-59 1.0E-10 1.20E-11 5.02E-13 7.49E-14 Cobalt-60 1.0E-10 1.07E-11 4.46E-13 6.38E-14 Zinc-65 1.0E-10 6.71 E-12 2.80E-13 4.03E-14 Molybdenum-99 1.0E-10 3.43E-11 1.61 E-12 4.70E-13 Cesium-134 1.0E-10 4.25E-12 1.77E-13 2.54E-14 Cesium-137 1.0E-10 8.48E-12 3.54E-13 5.05E-14 Cerium-141 1.0E-10 5.10E-12 2.15E-13 3.26E-14 Cerium-144 1.0E-10 2.01E-11 8.33E-13 1.20E 13 lodine-131 1.0E-10 4.76E-12 2.07E-13 3.77E-14 Charcoal Samole lodine-131 1.0E-11 7.25E-12 3.15E-13 5.74E-14 l (1) LLD values are in Cl/ml.

(2) At is the time between sample collection and countin0 time.

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

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EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT 19.21 TABLEB GASEOUS " TYPICAL" LLD EVALUATIOT Nuclide ODCMiin Tvolcal I I n Tritium 1.0E-06 1.0E-11 Gross Alpha 1.0E-11 1.5E-14 Strontium-89 1.0E-11 1.0E-14 Strontium-90 1.0E-11 1.0E-15 NOTES (1)' LLD values are in Cl/cc.

(2) At for noble gases is the time from sampling to analysis.

At for charcoal and particulate samples is the midpoint of sampling to analysis.

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EFFLUEN s A:O WASTE DISPOSAL ANNUAL REPORT 1Rl!I SOLID WASTE (RADIOACTIVE SHIPMENTS) l A. Solid Waste ShippedOffsite for Burial or Disposal (not Irradiated Fuel) 12 Month Est. Tot.

1. Tvoe of Waste MDjj Period grigt %

a. Spent resins, filtersludges, evaporator m 1.26E+01 15.00E-01

! bottoms, etc. Ci 2.57E+02 11.50E+00 i

i b. Dry Active Waste, Compressible Waste m' 4.03E+01 +5.00E-01 l Contaminated Equipment, etc. Cl 1.65E+00 15.00E+00

c. Irradiated Components, Control m' None N/A Rods, etc. Cl None N/A l d. Other: Mechanicd Filters m 3.41 E+00 15.00E-01 Cl 1.63E+01 15.00E+00

2. Estimate of Maior Nuclide Comoosition (by tvoe of waste)

a. Spent resins, filtersludges, evaporator bottoms, etc.

(nuclides determined by measurement)

Curies Percent 1, Manganese-54 8.50E+00 3.31E+00 l 2. Iron-55 6.09E+01 2.37E+01

3. Cobalt-60 3.69E+01 1.44E+01

4. Nickel-63 1.07E+02 4.17E+01

5. Cesium-134 5.62E+00 2.19E+00

6. Cesium-137 9.81E+00 3.82E+00

7. Cobalt-58 1.56E+01 6.06E+00

8. Antimony-125 7.26E+00 2.83E+00

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

(nuclides determined by estimate)

1. Iron-55 8.45E-01 5.15E+01 I

2. Cobalt-58 3.51 E-01 2.13E+01

3. Cobalt-60 1.86E-01 1.13E+01 1

4. Nickel-63 1.27E-01 7.67E+00

5. Cesium-137 4.91 E-02 2.98E+00

6. Chromium-51 3.67E-02 2.16E+00

c. Irradiated Compoilents N/A N/A i

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EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT 1991

SollD WASTE (RADIOACTIVE SHIPMENTS) l 2. Estimate of Maior Nuclide Comoosition (by tvoe of wasteMCont.)

l

d. Other: Mechanical Filters e

_Qgri_es Percent

1. Antimony-125 1.50E-01 9.20E-01

2. Manganese-54 2.35E-01 1.44E+00

3. Iron-55 1.05E+01 6.45E+01

4. Cobalt-58 2.15E-01 1.32E+00

5. Cobalt-60 3.73E+00 2.29E+01

6. Nickel-63 1.06E+00 6.51 E+00

3. Solid Waste Disoosition

a. Spent resins, filtersludges, evaporator bottoms, etc.

Number of Shioments Tvoe Quantity Mode of Transoortation Destination

! 2 >A-LSA ll Motor Freight Bamwell, SC 1 A-LSA 11 Motor Freight Barnwell, SC l

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

1 Number of Shioments Tvoe Quantitv Mode of Transoortation Destination 55* A-LSA Motor Freight Barnwell, SC i '55 of the shipments were shipped by a waste processor. g

c. Irradiated components, control rods, etc.

U: iberof Shioments Tvoe Quantity Mode of Transoortation Destination None N/A N/A N/A

d. Other: Mechanical Filters Number of Shioments Tvoe Quantity Mode of Transoortation Destination 1 A-LSA il Motor Freight Barnwell, SC

4. Irradiated Fuel Shioments(Disposition)

Number of Shioments Tvoe Quantity Mode of Transoortation Destination None N/A N/A N/A

5. Solidification of Waste Was solidification performed? NO J l

if yes, solidification media: N/A I

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1 EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT 1997 ATTACHMENT 1.0 l lNOPERABLE INSTRUMENTATION l

l In accordance with SON Technical Specification 6.8.4.f.1, the radioactive liquid and gaseous effluent monitoring instrumentation channels shown in Table 1.1-1and Table

! 1.1-2 of the ODCM shall be OPERABLE with their alarm / trip setpoints set to ensure l that the limits of the ODCM are not exceeded. If a radiation monitor is declared

inoperable then effluent releases may continue provided grab samples are collected i

and analyzed at a specified frequency. If the required instrumentation is out of service for greater than 30 days it must be reported in the Annual Radioactive Effluent Release Report why the inoperability could not be corrected within the 30 days..

On 9/8/97 @ 0102 the Radwaste effluent radiation monitor (0-RM-90-122) was removed from service for replacement and was not returned to service until 10/28/97.

The radiation monitor was a complete change in design which required additional time due to unforeseen changes during the replacement process. During this time frame duplicate samples and valve alignments were performed as required in the ODCM. 1 During the performance of 1-PI-ICC-090-452.0 on 2/20/97 it was noted that the primary sample flow indicator was out-of-tolerance at +32% high. At that time an evaluation was initiated by SQ970935PER. The 1-F-90-452 instrument loop is a part of the design of the Unit-1 Shield Building Radiation Monitor loop (1-RM-90-400) which is for ODCM evaluation of particulates and iodines. Additionally, it was determined that Unit-2 had this same problem since 11/1/94 of being high by +2.0%. The out-of tolerance was not initially considered a problem because the indicators were not included in the ODCM as a compliance instrument and System Engineering was not aware that they were being used by Chemistry. With the 1,2-FC/FM-90-452 reading out-of-tolerance, the actual sample flow to the samplars would not be isokinetic. An I evaluation of all effluent particulate and iodine samples was performed by Chemistry.

In 1994 and 1996 no particulates were released from the Unit-1 shield building. In 1995, Unit-1's total release from the shield building was 7.73pCi. Unit-2's total particulate release in 1994 was 6.49 Ci,1995 0.04pCi, and 19961.58 Ci. It should also be noted that any evaluation of particulates and iodines performed by Chemistry has a built in conservative correction factor of 20%. Therefore any reported releases from Unit-1 would be 12% low (non-conservative) and Unit-218% high (conservative).

Since there were very few particulates released from Unit-1 in 1995, this non-

, conservative error would not impact the annual dose calculations.

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EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT 1997 ATTACHMENT 1.0 i

INOPERABLE INSTRUMENTATION (Cont.)

The radiation monitors were initially declared inoperable until calibrations were completed. Chemistry procedures which used these flow loops were revised to utilize a conservative sample flow of 0.5 CFM at all times and no longer utilize this particular flow loop. If iodines and particulates become a dose issue in the future the flow instrumentation use will be revisited. However, at this time using 0.5 CFM as sample flow accounts for all potential errors by making an extremely conservative overestimation of the particulate and iodine radioactivity from the shield bldg.

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EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT 1997 ATTACHMENT 2.0 ABNORMAL /UNMONITORED RELEASES in accordance with Regulatory Guide 1.21, any abnormal releases should be clearly identified in the Annual Radioactive Effluent Release and the methods utilized in evaluating any radioactive effluents and/or offsite dose.

Rad DI Soill On 5/19/97 @ 1625, the conductivity probe on the intet to the Modularized Transfer Demineralization System (MFTDS) located in the 706 elevation Railroad Bay failed.

Problem Evaluation Report (SQ971429PER) was initiated. Approximately 3000 gallons unprocessed liquid radwaste was spilled. An estimated 600-1000 gallons of liquid spilled was released to the Site environment under the Railroad Bay door. The Rad Waste Yard outside the Auxiliary Bldg. was damed, visible water was vacuumed and the area covered. The storm drain in proximity to the Rad Waste Yard was sampled and indicated no radioactivity present. The Yard Pond down stream of the storm drain was also sampled and no contamination was identified.

The liquid influent to the MFTDS at the time of the probe failure was 4.84E-03 pCi/ml.

This radioactivity level based on a 600 Gal. release resulted in approximately 1.10E+04 pCi of fission and activation products and 7.63E+04 pCi of tritium being released.

Potential Release via PORVs On 3/22/97 @ 0054, Unit 1 shutdown for U1C8 refueling. During the unit shutdown the Steam Generator Power Operated Relief Valves (PORVs) were opened to reduce system temperature and pressure. However, during Uniti Cycle 8 operation number 4 steam generator had experienced a small primary-to-secondary leak (between 0.5-1.0 Gal./ day). Therefore the opening of the PORVs should have resulted in a small release of radioactivity. An evaluation was performed based on the radioactivity in the Reactor Coolant System, the leakrate and the time the PORVs were opened to quantify the potential release. Based on this evaluation approximately 17.31 pCi of noble gases and 102 pCi of tritium were released.

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4 EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT 1997 ATTACHMENT 2.0 ABNORMAUUNMONITORED RELEASES (Cont.)

Unmonitored Release As required by ODCM SR 2.2.1.1.1 Radioactive liquid wastes shall be sampled and analyzed according to the sampling and analysis program of Table 2.2-1. However on 3/3/97 0630 while closing the daily release permit for the condensate demineralizer it was determined that the sample for the release of the neutralization tank earlier that 1 day could not be found. An investigation was initiated (SQ970477PER). It indicated that due to a communication breakdown the sample was not collected as required. ;

The samples were routinely collected by Operations and picked up by Chemistry.

However, according to procedures, Chemistry when notified by Operations should have obtained the sample. Chemistry failed to obtain the sample due to a communication breakdown in the laboratory. !

The procedures used by Operations for releases from the Condensate Demineralizers has been revised to require Operations to collect the sample at the completion of each .

release. During the missed sample time there was no primary to secondary leakage, therefore only approximately 532 pCi of tritium was released. A release permit was generated to reflect the correct volume and tritium.

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O ENCLOSURE 2 SEQUOYAH NUCLEAR PLANT RADIOLOGICAL IMPACT ASSESSMENT REPORT I

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INTRODUCTION Potential doses to maximum individuals and the population around Sequoyah 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 Sequoyah.

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 releases 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 limit for doses to a member of the general public from radioactive material in liquid effluents released to unrestricted areas, is:

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 i

10 mrem per year (per reactor unit) to any organ The EPA 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: 1 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.

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RadiologicalImpact Assessment Sequoyah Nuclear Plant January - December 1997 Page 2 of 17 DOSE CALCULATIONS

{

)

Estimated doses to the public are determined using computer models (the Gaseous Effluent Licensing Code, GELC, and the Quarterly Water Dose Assessment Code, QWATA). These models are based on guidance provided by the NRC (in Regulatory Guides 1.109,1.111 and 1.113) for determining the potential dose to individuals and populations living in the vicinity of the plant. The area around the plant is analyzed to determine the pathways through which the public may receive a dose. The doses calculated are a representation of the dose to a

" maximum exposed individual." Some of the factors used in these calculations (such as ingestion rates) are maximum values. Many of these factors are obtained from NUREG/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 EFFLUft1TS 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 l

and beef animals.

1 Airbome Discharae Poinis All releases from Sequoyah 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 I are presented for each quarter in Attachment 1.0.

MefcoroloaicalData Meteorological variables at Sequoyah are measured continuously. Measurements collected include wind speed, wind direction, and temperature at heights of 10, 46, and 91 rneters above the ground. Quarterly joint frequency distributions (JFDs) are calculated for each release point using the appropriate levels of meteorological data. A joint frequency distribution 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 l m/s (1.5 mph). Stability classes are determined from the vertical temperature difference l between two measurement levels.

RadiologicalImpact Assessment Sequoyah Nuclear Plant January - December 1997

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Page 3 of 17 ErfemalExcosure 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 Sequoyah ODCM.

The highest of these doses is then selected.

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

Oraan 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 commercia!

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. i 1

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

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RadiologicalImpact Assessment Sequo"

Nuclear Plant January - a.: ember 1997 Page 4 of 17 DOSES FROM UQUID 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 Sequoyah. 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 Sequoyah Nuclear Plant ODCM.

Liould Release Points and RiverData Radioactivity concentrations in the Tennessee River are calculated assuming that releases in liquid effluents are continuous. All routine liquid releases from Sequoyan, 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 willinitially 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 471.0.

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 j downstream dam (Chickamauga Dom). The maximum individual dose from drinking water is {

assumed to be that calculated at the nearest downstream public water supply (E. l. DuPont).

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 E. l. DuPont, consumes fish caught from the Tennessee River between Sequoyah and Chickamauga Dam, u;id spends 500 hours0.00579 days 0.139 hours 8.267196e-4 weeks 1.9025e-4 months per year on the shoreline just below the outfall from Sequoyah. Dose estimates for the maximum individual due to liquid effluents for each quarter in the period are l presented in Tables 5 through 8, along with the average river flows past the plant site for the l periods. !

POPULATION DOSES 1.

Population doses for 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 are calculated assuming that each individual consumes milk, vegetables,

RadiologicalImpact Ass ssment Sequoyah Nuclear Plant i January - December 1997 Page 5 of 17 I

and meat produced within the sector annulus in which he resides. Doses from external I pathways and inhalation are based on the 50-mile human population distribution.

Population doses for total body and the maximum exposed organ due to liquid effluents are calculated for the entire downstream Tennessee hiver Population. Water ingestion population j doses are calculated using actual population figures for downstream public water supplies. I 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 through 8.

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RadiologicalImpact Assessment Sequoyah Nuclear Plant January - December 1997 j Page 6 of 17 l

l DIRECT RADIATION l.

i L External gat ima radiation levels were measured by thermoluminescent dosimeters (TLDs) l deployed around'Sequoyah as part of the offsite Evvironmental Radiological Monitoring Program. The quarterly gamma radiation levels determined from these TLDs during this reporting period averaged approximately 15.25 mR/ quarter at onsite (at or near the site l boundary) stations and approximate _ly 13.75 mR/ quarter at offsite stations, or approximately l - 1.5 mR/ quarter higher onsite than at offsite stations. This difference is consistent with levels l measured for preoperoiion and construction phases of the TVA nuclear plant site where,the 1

average radiation levels onsite were generally 2-6 mR/ quarter higher than the levels offsite.

This may be attributable to natural variations in environmenici radiation levels, earth moving activities onsite, the mass of concrete employed in the construcuon of the plants, or other undetermined influences. Fluctuations in natural background dose rates and in TLD readings l tend to mask any smallincrements 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.

DOSE TO A MEMBER OF THE PUBLIC INSIDE THE UNRESTR!CTED AREA BOUNDARY As stated in the Sequoyah Offsite Dose Calculation Manual, an evaluation of the dose to a member of the public inside the unrestricted area boundary is performed for a hypothetical l TVA employee who works just outside the restricted area fence for-on entire workyear (2000 j hours). Results from onsite TLD measurements for the calendar year in question indicate that the highest onsite TLD reading was 366 mrem. Using this value, and subtracting an annual l background value of 58 mrem / year and multiplying by the ratio of the occupancy times, the l highest external dose to a member of the public inside the unrestricted area boundary is 70 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 Sequoyah radioactive effluents and all other nearby uranium fuel cycle sources are considered, i

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.

Radiologicalimpact Assessment Sequoyah Nuclear Plant January - December 1997 Page 7 of 17 The annual thyroid dose to the maximum individualis 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 J 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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RadiologicalImpact Assessment Sequoyah Nuclear Plant January - December 1997 i

Page 8 of 17 i

Table 1 Doses from Airborne Effluents First Quarter Individual Doses Pathway Dose Quarterly Percent of Location Limit Limit Sector / Distance External Gamma Air 1.38E-03 mrad 5 mrod 0.028 N/950 Beta Air 1.68E-03 mrad 10 mrod 0.017 Submersion Total Body 8.64E-04 mrad 10 mrad 0.009 SSW/2134 l Skin 1.54E-03 mrad 10 mrad 0.015 l

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Oraan Doses Child /All Organs 4.51 E-03 mrem 7.5 mrem 0.06 NNW/841 Child / Total Body 4.51 E-03 mrem 7.5 mrem 0.06 Pooulation Doses i Total Body Dose 3.25E42 man-rem Maximum Organ Dose (organ) 3.25E-02 man-rem (thyroid, liver, GIT, kidney, bone, lung)

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

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s RadiologicalImpact Assessment Sequoyah Nuclear Plant January - December 1997 Page 9 of 17 Table 2

, Doses from Airborne Effluents i

Second Quarter 3 Individual Doses Pathway Dose Quarterly Percent of Location l Limit Limit Sector / Distance l

External i Gamma Air 3.01 E-03 mrod 5 mrad 0.060 N/950 Beta Air 7.46E-03 mrad 10 mrad 0.075 l.

Submersion Total Body 1.60E-03 mrad 10 mrad 0.016 N/1295 Skin 3.56E-03 mrad 10 mrad 0.036 i

Organ Doses Child / Thyroid 5.78E-03 mrem 7.5 mrem 0.077 NNW/841 Child / Total Body 5.77E-03 mrem 7.5 mrem 0.077 Pooulation Doses Total Body Dose 3.44E-02 man-rem Maximum Organ Dose (organ) 3.45E-02 man-rem (thyroid)

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

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I RadiologicalImpact Assessment Sequoyah Nuclear Plant January - December 1997 Page 10 of 17 l

Table 3 i Doses from Airborne Effluents Third Guarter Individual Doses Pathway Dose Quarterly Percent of Location Limit limit Sector / Distance External Gamma Air 1.71 E-02 mrad 5 mrad 0.342 S/1570 Beta Air 4.83E-02 mrad 10 mrod 0.483 Submersion Total Body 1.12E-02 mrad 10 mrad 0.112 S/1860 Skin 2.67E-02 mrad 10 mrad 0.267 Organ Doses Child /All Organs 2.55E-02 mrem 7.5 mrem 0.340 S/2249 Child / Total Body 2.55E-02 mrem 7.5 mrem 0.340 i

Pooulation Doses Total Body Dose 1.38E-01 man-rem Maximum Organ Dose (organ) 1.38E-01 man-rem (thyroid, bone, liver, GIT, lung, kidney)

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

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RadiologicalImpact Assessment Sequoyah Nuclear Plant January - December 1997 Page 11 of 17 l \

Table 4 1 i

Doses from Airborne Effluents

Fourth Quarter Individual Doses Pathway Dose Quarterly Percent of Location Limit Limit Sector / Distance l

L External 1

Gamma Air 2.70E-02 mrad 5 mrad 0.540 S/1570 l Beta Air 7.44E-02 mrad 10 mrod 0.744 l l

Submersion Total Body 1.77E-02 mrad 10 mrad 0.177 S/1860 l l Skin 4.16E-02 mrod 10 mrad 0.416 i Organ Doses l Child / Thyroid 2.24E-02 mrem 7.5 mrem 0.299 S/2249 l

! Child / Total Body 2.18E-02 mrem 7.5 mrem 0.291 J l

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l Pooulation Doses Total Body Dose 1.60E-01 man-rem

Maximum Organ Dose (organ) 1.64E-01 man-rem (thyroid)

Population doses can be compared to the naturalbackground dose for the entire 50-mile

} population of about 95,400 man-rem / year (based on 90 mrem /yr for naturalbackground).

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RadiologicalImpact Assessment Sequoyah Nuclear Plant January - December 1997 Page 12 of 17 Table 5 Doses from Liquid Effluents First Quarter Indi0idual Doses frem)

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

Body Adult / Child GIT / Liver / 1.6E-03 5 mrem <1% 4 Bone Child Thyroid 1.6E-03 5 mrem <1%

1 Average Riverflow past SQN (cubic feet per second): 62,695 l Pooulation Doses l

Total Body Dose 1.0E-01 man-rem i

Maximum Organ Dose (organ) 1.1E-01 rr " rem (GIT) l Population doses con be compared to the naturalbackground dose for the entire 50-mile population of about 95,400 man-rem / year (based on 90 miem/yr for naturalbackground).

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t Radiologicalimpact Assessment Sequoyah Nuclear Plant l January - December 1997 Page 13 of 17 Table 6 Doses from Liquid Effluents Second Quarter Individual Doses frem)

Age Group Orgari Dose Quarterly Percent Limit of Limit Adult Total Body 3.8E-03 1.5 mrem 1%

Adult / Child Liver 4.6E-03 5 mrem <1%

Child Thyroid 1.9E-03 5 mrem <1%

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Average Riverflow post SQN (cubic feet per second): 35,345 ;

i j Pooulation Doses ;

Total Body Dose 1.5E-01 man-rem !

Maximum Organ Dose (organ) 1.6E-01 man-rem (GIT)

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

RadiologicalImpact Assessment Sequoyah Nuclear Plant Januar/ - December 1997 Page 14 of 17 Table 7 Doses from Liquid Effluents l Third Quarter

( Individual Doses frem)

Age Group Organ Dose Quarterly Percent Limit of Limit l Adult Total Body 1.3E-02 1.5 mrem <1%

i Adult / Teen Liver 1.7E-02 5 mrem <1%

Child Thyroid 4.6E-03 5 mrem <1%

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Average Riverflow past SQN (cubic feet per second): 30,461 l

Pooulation Doses Total Body Dose 3.6E-01 man-rem i

Maximum Organ Dose (organ) 3.8E-01 man-rem (Liver) l l Population doses can be compared to the naturalbackground dose for the entire 50-mile population of about 95,400 man-rem / year (based on 90 mrem /yr for naturalbackground).

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L RadiologicalImpact Assessment Sequoyah Nuclear Plant January - December 1997 Page 15 of 17 Table 8 Doses from Liquid Effluents Fourth Quarter Individual Doses frem)

Age Group Organ Dose Quarterly Percent Limit of Limit Adult Total Body 3.5E-03 1.5 mrem <1%

Adult Gli 1.4E-02 5 mrem <1%

Child / Infant Thyroid 3.3E-03 5 mrem <1%

l Average Riverflow past SQN (cubic feet per second): 27,388 Pooulation Doses Total Body Dose 1.8E-01 man-rem Maximum Organ Dose (organ) 2.1E-01 man-rem (GIT)

Population doses con be compared to the naturalbackground dose for the entire 50-mile population of about 95.400 man-rem / year (based on 90 miem/yr fornaturalbackground).

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RadiologicalImpact Assessment Sequoyah Nuclear Plant January - December 1997 Page 16 of 17 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 8.64E-04 1.60E-03 1.12E-02 1.77E-02 Critical organ dose fair) 4.51 E-03 5.77E-03 2.55E-02 2.18E-02 Total body dose (liquid) 1.5E-03 3.8E-03 1.3E-02 3.5E-03 Maximum organ dose (liquid) 1.6E-03 4.6E-03 1.7E-02 1.4E-02 Direct Radiation Dose 0.0E-00 0.0E-00 0.0E-00 0.0E-00 Total 8.47E-03 1.58E-02 6.67E-02 5.70E-02 Cumulative Total Dose (Total body or any other oraan) mrem 1.49E-01 AnnualDose limit (mrem) 2.50E+01 Percent of Limit <1%

Thyroid Dose (mrem)

Total body air submersion 8.64E-04 1.60E-03 1.12E-02 1.77E-02 Thyroid dose (airborne) 4.51 E-03 5.78E-03 2.55E-02 2.24E-02 Total body dose (liquid) 1.5E-03 3.8E-03 1.3E-02 3.5E-03 Thyroid dose (liquid) 1.6E-03 1.9E-03 4.3 E-03 3.3E-03 Direct Radiation Dose 0.0E-00 0.0E-00 0.0E-00 0.0E-00 Total 8.47E-03 1.31 E-02 5.40E-02 4.69E-02 Cumulative Total Dose (Thyroid) mrem 1.22E-01 AnnualDose Limit (mrem) 7.50E+01 Percent of Limit <1%

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RadiologicalImpact Assessment Sequoyah Nuclear Plant January - December 1997 Page 17 of 17 Attachment 1.0 l

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JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECT 10N FOR STABILITY CLASS A (DELTA T<= 1.9 C/100 M)

SEQUOVAN NUCLEAR PLANT JAN 1, 97 MAR 31, 97 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 0.000 0.187 0.373 0.000 0.000 0.000 0.550 NNE 0.000 0.000 0.000 0.093 0.280 0.513 0.000 0.000 0.000 0.886 NE 0.000 0.000 0.000 0.140 0.280 0.047 0.047 0.000 0.000 0.513 ENE 0.000 0.000 0.000 0.047 0.000 0.000 0.000 0.000 0.000 0.047 E 0.000 0.000 0.000 0.047 0.000 0.000 0.000 0.000 0.000 0.047 ESE 0.000 0.000 0.000 0. 04 7 0.047 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 0.000 0.047 0.047 0.000 0.000 0.000 0.093 S 0.000 0.000 0.093 0.000 0.000 0.093 0.000 0.000 0.000 0.187 SSW 0.000 0.000 0.000 0.093 0.466 0.280 0.047 0.000 0.000 0.886 sd 0.000 0.000 0.000 0.093 0.233 0.093 0.000 0.000 0.000 0.420 WSW 0.000 0.000 0.000 0.000 0.140 0.000 0.000 0.000 0.000 0.140 W 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 WWW 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 0.093 0.047 0.000 0.000 0.000 0.140 NNW 0.000 0.000 0.000 C.047 0.140 0.513 0.000 0.000 0.000 0.700 SUBTOTAL 0.000 0.000 0.093 0.606 2.006 2.006 0.093 0.000 0.000 4.804 ,

TOTAL NOURS OF VALID STABILITY DBSERVAT10NS 2155 TOTAL HOURS OF STABILITY class A 104 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED STABILITY CLASS A 103 TOTAL HOURS OF VALID WINO DIRECTION-WIND SPEED STABILITY DBSERVATIONS 2144 TOTAL HOURS CALM 0 l

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METEOROLOGICAL FACILITY: SEQUOYAH NUCLEAR PLANT STABILITY BASED ON DELTA T BETWEEN 9.25 AND 45.99 METERS 9.73 METER LEVEL i WIND SPEED AND DIRECTION MEASURED AT DATE PRINTED: 29 APR-97 l

MEAN WIND SPEED = 7.49 ;

NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS

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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, 97 - MAR 31, 97 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 n24.5 TOTAL N 0.000 0.000 0.000 0.233 0.280 0.000 0.000 0.000 0.000 0.513 NNE 0.000. 0.000 0.000 0.093 0.840 0.140 0.000 0.000 0.000 1.0 73 NE 0.000 0.000 0.000 0.466 0.326 0.047 0.000 0.000 0.000 0.840 1 ENE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 l E 0.000 0.000 0.000 0.047 0.000 0.000 0.000 0.000 0.000 0.047 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 0.140 0.000 0.047 0.000 0.000 0.000 0.187 S 0.000 0.000 0.000 0.047 0.047 0.000 0.000 0.000 0.000 0.093 SSW 0.000 0.000 0.000 0.000 0.280 0.187 0.000 0.000 0.000 0.466 SW 0.000 0.000 0.000 0.093 0.326 0.140 0.000 0.000 0.000 0.560 WS'J 0.000 0.000 0.000 0.000 0.047 0.000 0.000 0.000 0.000 0.047 0 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 WW 0.000 0.000 0.000 0.000 0.047 0.093 0.000 0.000 0.000 0.140 NNW 0.000 0.000 0.000 0.047 0.233 0.140 0.000 0.000 0.000 0.420 SUBTOTAL 0.000 0.000 0.000 1.166 2.425 0.793 0.000 0.000 0.000 4.384 l

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TOTAL HOURS OF VAllD STABILITY OBSERVATIONS 2155 l TOTAL HOURS OF STABILITY CLASS B 94 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS B 94 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED STABILITY OBSERVATIONS 2144 VOTAL HOURS CALM 0 l

METEOROLOGICAL FACILITY: SEQUOYAH NUCLEAR PLANT STABILITY BASED ON DELTA T BETWEEN 9.25 AND 45.99 METERS dlND SPEED AND DIRECTION MEASURED AT 9.73 METER LEVEL DATE PRINTED: 29-APR-97 MEAN WIND SPEED = 6.32 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS I

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l JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR l STABILITY CLASS C ( 1.7< DELTA T<=-1.5 C/100 M) 1 I

! SEQUOYAH NUCLEAR PLANT JAN 1, 97 - MAR 31, 97 l

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WIND WIND SPEED (MPH)

I 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 0.093 0.140 0.047 0.000 0.000 0.000 0.280 NNE 0.000 0.000 0.093 0.280 0.3 73 0.373 0.000 0.000 0.000 1.119 i CE 0.000 0.000 0.140 0.420 0.233 0.047 0.000 0.000 0.000 0.840 ENE 0.000 0.000 0.04 7 0.047 0.000 0.000 0.000 0.000 0.000 0.093 E 0.000 0.000 0.047 0.000 0.000 0.000 0.000 0.000 0.000 0.047 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 0.047 0.000 0.000 0.000 0.000 0.000 0.047 i S 0.000 0.000 0.093 0.047 0.140 0.047 0.000 0.000 0.000 0.326 SSW 0.000 0.000 0.000 0.280 0.140 0.047 0.000 0.000 0.000 0.466 i SW 0.000 0.000 0.000 0.233 0.187 0.047 0.000 0.000 0.000 0.466 WSW 0.000 0.000 0.000 0.000 0.093 0.000 0.000 0.000 0.000 0.093 W 0.000 0.000 0.000 0.047 0.000 0.047 0.000 0.000 0.000 0.093 WNW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 NW 0.000 0.000 0.000 0.000 0.000 0.187 0.000 0.000 0.000 0.187 N:W 0.000 0.000 0.000 0.093 0.326 0.047 0.000 0.000 0.000 0.466 SCJTOTAL 0.000 0.000 0.420 1.586 1.632 0.886 0.000 0.000 0.000 4.524 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2155 TOTAL HOURS OF STABILITY CLASS C 97 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS C 97 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED STABILITY OBSERVATIONS 2144 70TAL HOURS CALM 0 METEOROLOGICAL FACILITY SEQUOYAH NUCLEAR PLANT OTABILITY BASED ON DELTA-T BETWEEN 9.25 AND 45.99 METERS WIND SPEED AND DIRECTION MEASURED AT 9.73 METER LEVEL DATE PRINTED: 29-APR 97 MEAN WIND SPEED = 6.02 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS I

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

SEQUOYAH NUCLEAR PLANT JAN 1, 97 - MAR 31, 97 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 0.047 1.446 2.146 2.332 1.213 0.000 0.000 0.000 7.163 NNE 0.000 0.047 1.166 2.3 79 1.586 2.285 0.000 0.000 0.000 7.463 NE 0.000 0.000 0.793 0.653 0.093 0.000 0.000 0.000 0.000 1.539 ENE 0.000 0.047 0.420 0.187 0.000 0.000 0.000 0.000 0.000 0.653 E 0.000 0.047 0.047 0.000 0.000 0.000 0.000 0.000 0.000 0.093 ESE 0.000 0.000 0.047 0.000 0.000 0.000 0.000 0.000 0.000 0.047 SE 0.000 0.04 7 0.233 0.000 0.047 0.000 0.000 0.000 0.000 0.326 SSE 0.000 0.047 0.140 0.093 0.000 0.000 0.000 0.000 0.000 0.280

$ 0.000 0.047 0.513 0.420 0.513 0.560 0.140 0.000 0.000 2.192 SSW 0.000 0.047 0.840 1.632 0.793 0.793 0.000 0.000 0.000 4.104 SW 0.000 0.047 0.700 1.213 0.420 0.793 0.000 0.000 0.000 3.172 WSW 0.000 0.093 0.513 0.187 0.326 0.233 0.000 0.000 0.000 1.353 0 0.000 0.187 0.233 0. 04 7 0.187 0.093 0.000 0.000 0.000 0.746 WWW 0.000 0.047 0.093 0.093 0.233 0.326 0.000 0.000 0.000 0.793 NW 0.000 0.000 0.373 0.187 0.3 73 0.093 0.000 0.000 0.000 1.026 NNW 0.000 0.047 0.420 0.606 1.0 73 0.840 0.000 0.000 0.000 2.985

$UST0TAL 0.000 0.793 7.976 9.841 7.976 7.229 0.140 0.000 0.000 33.955 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2155 TOTAL HOURS OF STABIAITY CLASS D 731 l

TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED STABILITY CLASS D 728 l TOTAL NOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2144

! TOTAL HOURS CALM 0 l

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: 29-APR-97 MEAN WIND SPEED = 5.34 I

N07Et TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS j

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

SEQUOYAH NUCLEAR PLANT JAN 1, 97 MAR 31, 97 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 0.007 0.3 73 1.912 1.399 0.326 0.187 0.000 0.000 0.000 4.205 NNE 0.007 0.187 2.006 1.353 0.093 0.000 0.000 0.000 0.000 3.645 NE 0.002 0.187 0.513 0.093 0.000 0.000 0.000 0.000 0.000 0.795 ENE 0.001 0.280 0.140 0.000 0.000 0.000 0.000 0.000 0.000 0.421 E 0.001 0.140 0.140 0.000 0.000 0.000 0.000 0.000 0.000 0.281 ESE 0.000 0.000 0.093 0.000 0.000 0.000 0.000 0.000 0.000 0.094 SE 0.001 0.047 0.187 0.000 0.000 0.000 0.000 0.000 0.000 0.234 J

0.887 SSE 0.001 0.04 7 0.326 0.187 0.140 0.140 0.047 0.000 0.000 S 0.004 0.187 0.979 0.653 1.493 1.259 0.093 0.000 0.000 4.668 SSW. 0.007 0.140 2.006 2.239 1.726 0.840 0.000 0.000 0.000 6.956 SW 0.007 0.140 2.052 2.006 0.513 0.093 0.000 0.000 0,000 4.811 WSW 0.002 0.140 0.373 0.3 73 0.093 0.187 0.000 0.000 0.000 1.1 68 0 0.002 0.140 0.466 0.140 0.140 0.047 0.000 0.000 0.000 0.935 WN3 0.001 0.047 0.280 0.466 0.140 0.000 0.000 0.000 0.000 0.934 NW 0.002 0.140 0.420 0.606 0.093 0.047 0.000 0.000 0.000 1.308 WNW 0.003 0.187 0.840 0.700 0.233 0.280 0.000 0.000 0.000 2.242 i

SUBT07AL 0.047 2.379 12.733 10.215 4.991 3.078 0.140 0.000 0.000 33.582 TOTAL HOURS OF VALID STABILITY OBSERVATIDMS 2155 TOTAL NOURS OF STABILITY CLASS E 727 TOTAL HOURS OF VALID WIND DiKICTION WIND SPEED-STABILITY CLASS E 720 TOTAL HOURS OF VAllD WIND DIRECT!DN-WIND SPEED-STABILITY OBSERVATIONS 2144 TOTAL HOURS CALM 1 j

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: 29-APR-97 MEAN WIND SPEED = 4.13 i i

NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS

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

SEQUOYAH NUCLEAR PLANT JAN 1, 97 - MAR 31, 97 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 1.073 0.140 0.000 0.000 0.000 0.000 0.000 1.213

( NNE 0.000 0.233 2.845 0.465 0.000 0.000 0.000 0.000 0.000. 3.545 NE 0.000 0.326 0.840 0.000 0.000 0.000 0.000 0.000 0.000 1.166 0.000 0.047 0.233 0.000 0.000 0.000 0.000 0.000 0.000 0.280

( ENE E 0.000 0.140 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.140 ESE 0.000 0.140 0.093 0.000 0.000 0.000 0.000 0.000 0.000 0.233 SE 0.000 0.140 0.047 0.000 0.000 0.000 0.000 0.000 0.000 0.187 SSE 0.000 0.140 0.093 0.000 0.000 0.000 0.000 0.000 0.000 0.233 S 0.000 0.047 0.606 0.093 0.000 0.000 0.000 0.000 0.000 0.746 SSW 0.000 0.000 1.119 0.513 0.000 0.000 0.000 0.000 0.000 1.632 SW 0.000 0.047 1.073 0.466 0.000 0.047 0.000 0.000 0.000 1.632 WSW 0.000 0.093- 0.280 0.047 0.000 0.000 0.000 0.000 0.000 0.420 0 0.000 0.000 0.093 0.047 0.000 0.000 0.000 0.000 0.000 0.140 WNW 0.000 0.000 0.093 0.000 0.000 0.000 0.000 0.000 0.000 0.093 l NW 0.000 0.000 0.047 0.000 0.000 0.000 0.000 0.000 0.000 0.047 NNW 0.000 0.000 0.140 0.140 0.000 0.000 0.000 0.000 0.000 0.280 SUBTOTAL 0.000 1.353 8.675 1.912 0.000 0.047 0.000 0.000 0.000 11.987 I

TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2155 TOTAL HOURS OF STABILITY CLASS F 257 TOTAL HOURS OF VALID WIND DIRECTION WIND SPEED-STABILITY CLASS F 257 l 70TAL HOURS OF VALID WIND DIRECTION-WIND SPEED STABILITY OBSERVATIONS 2144 VOTAL HOURS CALM 0 METEOROLOGICAL FACILITY: SEQUOYAH NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 9.25 AND 45. M METERS WIND SPEED AND DIRECTION MEASURED AT 9.73 METER LEVEL DATE PRINTED: 29-APR-97 MEAN WIND SPEED = 2.51 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS l ,

I l

.. * ~

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

SE000 YAM NUCLEAR PLANT JAN 1, 97 - MAR 31, 97 WIND WIND SPEED (MPH)

DIRECTION CALM 0.6-1.4 1.5 3.4 3.5 5.4 5.57.4 7.5 12.4 12.5-18.4 18.5-24.4 >=24.5 TOTAL N 0.004 0.000 0.280 0.000 0.000 0.000 0.000 0.000 0.000 0.204 NME 0.023 0.187 1.399 0.000 0.000 0.000 0.000 0.000 0.000 1.626 NE 0.019 0.233 1.119 0.000 0.000 0.000 0.000 0.000 0.000 1.3 72 ENE 0.006 0.187 0.233 0.000 0.000 0.000 0.000 0.000 0.000 0.4:6 E 0.004 0.280 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.234 ESE 0.001 0.04 7 0.047 0.000 0.000 0.000 0.000 0.000 0.000 0.095 SE 0.002 0.047 0.093 0.000 0.000 0.000 0.000 0.000 0.000 0.142 SSE 0.006 0.233 0.187 0.000 0.000 0.000 0.000 0.000 0.000 0.426 j S 0.006 0.187 0.233 0.000 0.000 0.000 0.000 0.000 0.000 0.426 SSW 0.012 0.140 0.700 0.093 0.000 0.000 0.000 0.000 0.000 0.945 SW 0.007 0.000 0.513 0.000 0.000 0.000 0.000 0.000 0.000 0.520 Wsw 0.001 0.000 0.047 0.047 0.000 0.000 0.000 0.000 0.000 0.094 0- 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 WNW 0.001 0.000 0.047 0.000 0.000 0.000 0.000 0.000 0.000 0.047 NW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 NNW 0.001 0.000 0.093 0.000 0.000 0.000 0.000 0.000 0.000 0.095

$UBTOTAL 0.093 1.539 4.991 0.140 0.000 0.000 0.000 0.000 0.000 6.763 1

l l

l TOTAL HOURS OF VALID STABILITY DBSERVATIONS 2155 1 TOTAL HOURS OF STABILITY CLASS G 145 f TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS G 145 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVAT!DNS 2144 VOTAL HOURS CALM 2 I

l i

l METEOROLOGICAL FACILITY: SE000YAN NUCLEAR PLANT f BTABILITY BASED ON DELTA T BETWEEh 9.25 AND 45.99 METERS ,

( WINO SPEED AND DIRECTION MEASURED AT 9.73 METER LEVEL DATE PRINTED: 29 APR-97 MEAN WIND SPEED = 1.91 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS

. 05 I

JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR l

5 l STABILITY CLASS A' (DELTA T<= 1.9 C/100 M)

Sequoyah Nuclear Plant l

APR 1, 97 - JUN 30, 97 i

l UIND 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 I

N 0.000 0.000 0.000 0.147 0.049 0.440 0.000 0.000 0.000 0.636 ENE 0.000 0.000 0.049 0.636 0.685 0.489 0.000 0.000 0.000 1.858 NE 0.000 0.000 0.000 0.489 0.391 0.244 0.00C 0.000 0.000 1.125 ENE 0.000 0.000 0.049 0.049 0.000 0.000 0.000 0.000 0.000 0.098 E 0.000 0.000 0.000 0.049 0.000 0.000 0.000 0.000 0.000 0.049 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 0.147 0.049 0.000 0.000 0.000 0.000 0.196 SSE 0.000 0.000 0.000 0.196 0.000 0.147 0.000 0.000 0.000 0.342 S 0.000 0.000 0.000 0.098 0.293 0.196 0.098 0.000 0.000 0.685 SSW 0.000 0.000 0.049 0.831 1.076 0.244 0.000 0.000 0.000 2.200 SW 0.000 0.000 0.098 0.733 0.489 0.000 0.000 0.000 0.000 1.320 WSW 0.000 0.000 0.000 0.049 0.147 0.000 0.000 0.000 0.000 0.196 W 0.000 0.000 0.000 0.000 0.147 0.049 0.000 0.000 0.000 0.196 WNW 0.000 0.000 0.000 0.049 0.147 0.000 0.000 0.000 0.000 0.196 NW 0.000 0.000 0.000 0.000 0.244 0.440 0.000 0.000 0.000 0.685 NNW 0.000 0.000 0.000 0.000 0.196 0.342 0.000 0.000 0.000 0.538 SUBTOTAL 0.000 0.000 0.244 3.4 72 3.912 2.592 0.098 0.000 0.000 10.318 l TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2056 TOTAL HOURS OF STABILITY CLASS A 213 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED STABILITY CLASS A 211 l 2045 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS TOTAL HOURS CALM 0 METEOROLOGICAL FACILITY: Sequoyah Nuclear Plant STA81LITY BASED DN DELTA-T BETWEEN 9.25 AND 45.99 METERS WIND SPEED AND DIRECTION MEASURED AT 9.73 METER LEVEL DATE PRINTED: 04-Aug-97 MEAN WIND SPEED = 6.29 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMSERS l

J0!NT 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, 97 + JUN 30, 97 t!!ND WIND SPEED (MPM)

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 0.049 0.098 0.000 0.147 0.000 0.000 0.000 0.293 NNE 0.000 0.000 0.098 0.538 0.049 0.244 0.000 0.000 0.000 0.929 NE 0.000 0.000 0.098 0.049 0.147 0.000 0.00C 0.000 0.000 0.293 ENE 0.000 0.000 0.049 0.049 0.000 0.000 0.000 0.000 0.000 0.098 E 0.000 0.000 0.000 0.049 0.000 0.000 0.000 0.000 0.000 0.049 ESE 0.000 0.000 0.147 0.049 0.000 0.000 0.000 0.000 0.000 0.1%

SE 0.000 0.000 0.098 0.000 0.000 0.000 0.000 . 0.000 0.000 0.098 SSE 0.000 0.000 0.000 0.147 0.049 0.049 0.000 0.000 0.000 0.244 S 0.000 0.000 0.049 0.196 0.147 0.1% 0.000 0.000 0.000 0.587 SSW 0.000 0.000 0.098 0.636 0.293 0.000 0.000 0.000 0.000 1.027 SW 0.000 0.000 0.098 0.636 0.196 0.244 0.000 0.000 0.000 1.174 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 0.098 0.000 0.000 0.098 0.000 0.000 0.000 0.1%

WNW 0.000 0.000 0.000 0.000 0.049 0.098 0.000 0.000 0.000 0.147 NW 0.000 0.000 0.000 0.000 0.147 0.000 0.000 0.000 0.000 0.147 NNW 0.000 0.000 0.000 0.000 0.147 0.147 0.000 0.000 0.000 0.293

)

SUBTOTAL 0.000 0.000 0.880 2.445 1.222 1.222 0.000 0.000 0.000 5.770 TOTAL HOURS OF VAllD STABILITY OBSERVATIONS 2056 TOTAL HOURS OF STABILITY CLASS B 118 TOTAL HOURS OF VALIO WIND DIRECTION WIND SPEED-STABILITY CLASS B 118 TOTAL HOURS OF VALID WIND DIRECTION WINO SPEED-STABILITY OBSERVAfloNS 2045 TOTAL HOURS CALM 0 4

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: 04-Aug-97 MEAN WIND SPEED = 5.48 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS

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

Sequoyah Nuclear Plant APR 1, 97 - JUN 30, 97 l

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 0.049 0.049 0.049 0.000 0.000 0.000 0.000 0.147 NNE 0.000 0.000 0.098 0.293 0.04 9 0.098 0.000 0.000 0.000 0.538 NE 0.000 0.000 0.244 0.391 0.000 0.049 0.000 0.000 0.000 0.685 ENE 0.000 0.000 0.098 0.000 0.000 0.000 0.000 0.000 0.000 0.098 E 0.000 0.000 0.098 0.049 0.000 0.000 0.000 0.000 0.000 0.147 l ESE 0.000 0.000 0.098 0.000 0.000 0.000 0.000 0.000 0.000 0.098 SE 0.000 0.000 0.049 0.098 0.000 0.000 0.000 0.000 0.000 0.147 l SSE 0.000 0.000 0.049 0.000 0.000 0.098 0.000 0.000 0.000 0.147 S 0.000 0.000 0.196 0.342 0.196 0.098 0.000 0.000 0.000 0.831 SSW 0.000 0.000 0.293 1.076 0.244 0.000 0.000 0.000 0.000 1.614 SW 0.000 0.000 0.147 0.391 0.147 0.000 0.000 0.000 0.000 0.685 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 l

t WWW 0.000 0.000 0.049 0.000 0.049 0.049 0.000 0.000 0.000 0.147 NW 0.000 0.000 0.000 0.000 0.049 0.049 0.000 0.000 0.000 0.098 NNW 0.000 0.000 0.000 0.000 0.096 0.04 9 0.000 0.000 0.000 0.147 l

SUBTOTAL 0.000 0.000 1.467 2.689 0.880 0.489 0.000 0.000 0.000 5.526 l

l TOTAL HOURS OF VALID STABILITY DBSERVATIONS 2056 TOTAL HOURS OF STABILITY CLASS C 113 TOTAL HOURS OF VALID WIND DIRECTION WIND SPEED-STABILITY CLASS C 113 TOTAL HOURS OF VAllD WIND DIRECT!DN-WIND SPEED-STABILITY OBSERVATIONS 2045 TOTAL HOURS CALM 0 I I

METEOROLOGICAL FACILITY: Sequoyah Nuclear Plant STABILITY DASED ON DELTA *T BETWEEN 9.25 AND 45.99 METERS WIND SPEED AND DIRECTION MEASURED AT 9.73 METER LEVEL DATE PRINTED: 04 Aug-97 MEAN WIND SPEED = 4.71 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS

L )

i I l . !

l l

JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR l

l. .

STABILITY CLASS D ( 1.5< DELTA T<=-0.5 C/100 M) l Sequoyah Nuclear Plant I

I APR 1, 97 - JUN 30, 97 l

WIND WIND SPEED (MPM)

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 1

i I

0 0.000 0.098 1.320 0.538 0.538 0.391 0.000 0.000 0.000 2.885 NNE 0.000 0.147 1.271 1.809 0.587 0.391 0.000 0.000 0.000 4.205 NE 0.000 0.049 0.587 0.440 0.049 0.049 0.000 0.000 0.000 1.174 ENE 0.000 0.244 0.391 0.049 0.000 0.000 0.000 0.000 0.000 0.685 E 0.000 0.000 0.342 0.000 0.000 0.000 0.000 0.000 0.000 0.342 j ESE 0.000 0.098 0.098 0.098 0.000 0.000 0.000 0.000 0.000 0.293 j SE 0.000 0.196 0.636 0.000 0.000 0.000 0.000 0.000 0.000 0.831 SSE 0.000 0.098 0.538 0.293 0.000 0.049 0.049 0.000 0.000 1.027

$ 0.000 0.049 2.054 2.689 1.320 0.342 0.000- 0.000 0.000 6.455 SSW 0.000 0.293 2.200 3.716 1.076 0.147 0.000 0.000 0.000 7.433 SU 0.000 0.000 1.467 1.271 0.342 0.244 0.000 0.000 0.000 3.325 WSW 0.000 0.244 0.733 0.049 0.098 0.049 0.000 0.000 0.000 1.174 W 0.000 0.098 0.098 0.147 0.000 0.049 0.000 0.000- 0.000 0.391 WNW 0.000 0.049 0.147 0.049 0.049 0.000 0.000 0.000 0.000 0.293 NW 0.000 0.349 0.196 0.196 0.244 0.196 0.000 0.000 0.000 0.880 NNW 0.000 0.147 0.196 0.244 0.293 0.049 0.000 0.000 0.000 0.929 I

0.049 0.000 0.000 32.323 I SLDTOTAL 0.000 1.858 12.274 11.589 4.597 1.956 i #

TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2056 l

l TOTAL HOURS OF STABILITY CLASS D 663 TOTAL HOURS OF VALID WIND DIRECTION

WIND SPEED-STABILITY CLASS D 661 1

1 70TAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2045 i TOTAL HOURS CALM 0 l

l 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: 04-Aug-97 MEAN WIND SPEED = 4.06 I

i NOTE: TOTALS AND SU8 TOTALS ARE OBTAINED FROM UNROUNDED NUNBERS

(

l

\ -

JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR l

l STABILITY CLASS E (-0.5< DELTA T<= 1.5 C/100 M)

Sequoyah Nudear Plant 1

APR 1, 97 JUN 30, 97 WIND WIN 0 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 n24.5 TOTAL l

N 0.105 0.685 1.418 1.369 0.831 0.000 0.000 0.000 0.000 4.408 NNE 0.115 0.538 1.760 1.125 0.293 0.098 0.000 0.000 0.000 3.929 NE 0.027 0.244 0.293 0.049 0.000 0.000 0.000 0.000 0.000 0.614 ENE 0.005 0.049 0.049 0.000 0.000 0.000 0.000 0.000 0.000 0.103 E 0.007 0.049 0.098 0.000 0.000 0.000 0.000 0.000 0.000 0.154 ESE 0.010 0.098 0.098 0.000 0.000 0.000 0.000 0.000 0.000 0.205 SE 0.022 0.196 0.244 0.000 0.000 0.000 0.000 0.000 0.000 0.462 SSE ~0.039 0.489 0.293 0.049 0.196 0.293 0.000 0.000 0.000 1.359 S 0.137 0.929 1.809 0.440 0.391 0.293 0.000 0.000 0.000 4.000 SSW 0.198 0.391 3.570 1.516 0.53E 0.049 0.000 0.000 0.000 6.262 SW 0.137 0.293 2.445 1.027 0.293 0.049 0.000 0.000 0.000 4.244 WSW 0.024 0.098 0.391 0.391 0.049 0.000 0.000 0.000 U.000 0.954 0 0.017 0.147 0.1% 0.049 0.049 0.000 0.000 0.000 0.000 0.457 WNW 0.024 0.244 0.244 0.342 0.147 0.000 0.000 0.000 0.000 1.002 NW 0.027 0.293 0.244 0.587 0.049 0.000 0.000 0.000 0.000 1.200 NNW 0.083 0.587 1.076 0.440 0.147 0.098 0.000 0.000 0.000 2.430-SUBTOTAL 0.978 5.330 14.230 7.384 2.983 0.880 0.000 0.000 0.000 31.785 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2056 TOTAL HOURS OF STABILITY CLASS E 656 VOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS E 650 TOTAL HOUR 7 0F VALID WIND DIRECTION WIND SPEED STABILITY OBSERVATIONS 2045 TOTAL HOURS CALM 20 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: 04 Aug-97 l

MEAN WIND SPEED = 3,06 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS

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

Sequoyoh Nuclear Plant APR 1, 97 - JUN 30, 97 l

SIMD 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

]

I J

N 0.024 0.049 1.614 0.342 0.000 0.000 0.000 0.000 0.000 2.029 NNE 0.049 0.636 2.787 0.147 0.000 0.000 0.000 0.000 0.000 3.618 NE 0.015 0.440 0.636 0.049 0.000 0.000 0.000 0.000 0.000 1.140 ENE 0.003 0.147 0.049 0.000 0.000 0.000 0.000 0.000 0.000 0.198 E 0.001 0.098 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.099 ESE 0.005 0.342 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.347 SE 0.005 0.342 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.347 I

SSE 0.003 0.098 0.098 0.000 0.000 0.000 0.000 0.000 0.000 0.198 S 0.005 0.098 0.244 0.000 0.000 0.000 0.000 0.000 0.000 0.347 SSW 0.013 0.293 0.636 0.000 0.000 0.000 0.000 0.000 0.000 0.942 SW 0.008 0.049 0.489 0.000 0.000 0.000 0.000 0.000 0.000 0.546 WSW 0.001 0.049 0.049 0.000 0.000 0.000 0.000 0.000 0.000 0.099 ]

O 0.002 0.000 0.147 0. 049 0.000 0.000 0.000 0.000 0.000 0.198 I WNW 0.003 0.000 0.196 0.147 0.049 0.000 0.000 0.000 0.000 0.394 NW 0.003 0.049 0.196 0.147 0.000 0.000 0.000 0.000 0.000 0.395 NNW 0.007 0.098 0.391 0.147 0.000 0.000 0.000- 0.000 0.000- 0.643 SUBTOTAL 0.147 2.787 7.531 1.027 0.049 0.000 0.000 0.000 0.000 11.540 TOTAL HOURS OF VALID STABILITY DBSERVATIONS 2056 TOTAL HOURS OF STABILITY CLASS F 237 TOTAL NOURS OF VALID WIND DIRECTION WIND SPEED STABILITY CLASS F 236 VOTAL HOURS OF VALID WIND DIRECTION WIND SPEED STABILITY DBSERVATIONS 2045 VOTAL HOURS CALM 3 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: 04-AuB-97 MEAN WIND SPEED = 2.11 l

l NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS

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, 97 JUN 30, 97 WIND WIND SPEED (MPM)

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

_ e I

N 0.000 0.000 0.147 0.000 0.000 0.000 0.000 0.000 0.000 0.147 NNE 0.000 0.000 0.636 0.196 0.000 0.000 0.000 0.000 0.000 0.831 NE 0.000 0.098 0.196 0.000 0.000 0.000 0.000 0.000 0.000 0.293 l ENE 0.000 0.147 0.098 0.000 0.000 0.000 0.000 0.000 0.000 0.244 E 0.000 0.244 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.244 ESE 0.000 0.049 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.049 SE 0.000 0.098 0.049 0.000 0.000 0.000 0.000 0.000 0.000 0.147 SSE 0.000 0.098 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.098 5 0.000 0.049 0.147 0.000 0.000 0.000 0.000 0.000 0.000 0.196 SSW 0.000 0.000 0.244 0.000 0.000 0.000 0.000 0.000 0.000 0.244 SW 0.000 0.000 0.049 0.000 0.000 0.000 0.000 0.000 0.000 0.049 WSW 0.000 0.000 0.049 0.000 0.000 0.000 0.000 0.000 0.000 0.049 l

0 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 1 l

WWW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 l

i N3 0.000 0.000 0.147 0.000 0.000 0.000 0.000 0.000 0.000 0.147 .

! NNW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 SUBTOTAL 0.000 0.782 1.760 0.196 0.000 0.000 0.000 0.000 0.000 2.738 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2056

?OTAL HOURS OF STABILITY CLASS G 56 VOTAL HOURS OF VALID WIND DIRECTION WIND SPEED-STABILITY CLASS G 56 70TAL HOURS OF VALID WIND DIRECTION WIND SPEED-STABILITY OBSERVATIONS 2045 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: 04 Aug 97 MEAN WIND SPEED = 2.00 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS

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

Sequoyah Nuclear Plant JUL 1, 97 SEP 30, 97 WIND WIND SPEED (MPH)

DIREC710N 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 0.096 0.144 0.336 0.048 0.000 0.000 0.000 0.624 NNE 0.000 0.000 0.528 1.823 0.768 0.288 0.000 0.000 0.000 3.407 NE 0.000 0.000 0.768 1.871 0.240 0.000 0.000 0.000 0.000 2.879 ECE 0.000 0.000 0.288 0.192 0.000 0.000 0.000 0.000 0.000 0.480 E 0.000 0.000 0.288 0.144 0.000 0.000 0.000 0.000 0.000 0.432 ESE 0.000 0.000 0.096 0.288 0.000 0.000 0.000 0.000 0.000 0.384 SE 0.000 0.000 0.192 0.336 0.000 0.000 0.000 0.000 0.000 0.528 SSE 0.000 0.000 0.048 0.336 0.096 0.000 0.000 0.000 0.000 0.480 5 0.000 0.000 0.096 1.008 0.240 0.048 0.000 0.000 0.000 1.392 SSW 0.000 0.000 0.096 2.111 0.864 0.096 0.000 0.000 0.000 3.167

'SW 0.000 0.000 0.192 1.344 0.288 0.000 0.000 0.000 0.000 1.823 WSW 0.000 0.000 0.048 0.000 0.048 0.000 0.000 0.000 0.000 0.096 W 0.000 0.000 0.000 0.000 0.096 0.048 0.000 0.000 0.000 0.144 WNW 0.000 0.000 0.048 0.096 0.096 0.048 0.000 0.000 0.000 0.288 N3 0.000 0.000 0.000 0.096 0.144 0.000 0.000 0.000 0.000 0.240 NNW 0.000 0.000 0.000 0.048 0.144 0.048 0.000 0.000 0.000 0.240 I

SUB70TAL 0.000 0.000 2.783 9.837 3.359 0.624 0.000 0.000 0.000 16.603 l i

l YOTAL HOURS OF VALID STABILITY OBSERVATIONS 2198 TOTAL HOURS OF STABILITY CLASS A 352 TOTAL HOURS OF VALIO WIND DIRECTION WIND SPEED STABILITY CLASS A 346 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED STABILITY CBSERVATIONS 2084 TOTAL HOURS CALM 0 1

l METEOROLOGICAL FACILITY: Sequoyah Nuclear Plant S? ABILITY BASED ON DELTA T BETWEEN 9.25 AND 45.99 METERS l- WIND SPEED AND DIRECTION MEASURED AT 9.73 METER LEVEL DATE PRINTED: 27-Oct-97 MEAN WIND SPEED = 4.67 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS

. 1

\

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

Sequoyah Nuclear Plant JUL 1, 97 - SEP 30, 97 UIND WIND SPEED (MPH)

DIRECTIDW 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 0.096 0.240 0.048 0.000 0.000 0.000 0.000 0.384 NNE 0.000 0.000 0.288 0.720 0.288 0.144 0.000 0.000 0.000 1.440 CE 0.000 0.000 0.192 0.144 0.000 0.000 0.000 0.000 0.000 0.336 ENE 0.000 0.000 0.144 0.000 0.000 0.000 0.000 0.000 0.000 0.144 E 0.000 0.000 0.048 0.000 0.000 0.000 0.000 0.000 0.000 0.048 ESE 0.000 0.000 0.048 0.000 0.000 0.000 0.000 0.000 0.000 0.048 SE 0.000 0.000 0.144 0.000 0.000 0.000 0.000 0.000 0.000 0.144 SSE 0.000 0.000 0.192 0.240 0.048 0.000 0.000 0.000 0.000 0.480 S 0.000 0.000 0.240 0.384 0.048 0.000 0.000 0.000 0.000 0.672 SSW 0.000 0.000 0.528 1.200 0.096 0.000 0.000 0.000 0.000 1.823 SW 0.000 0.000 0.288 0.432 0.096 0.000 0.000 0.000 0.000 0.816 WSW 0.000 0.000 0.000, 0.144 0.048 0.000 0.000 0.000 0.000 0.192 0 0.000 0.000 0.000 0.000 0.144 0.000 0.000 0.000 0.000 0.1 44 WNW 0.000 0.000 0.000 0.096 0.048 0.000 0.000 0.000 0.000 0.144 NW 0.000 0.000 0.000 0.048 0.048 0.000 0.000 0.000 0.000 0.096 NNW 0.000 0.000 0.000 0.096 0.096 0.000 0.000 0.000 0.000 0.197 SUBTOTAL 0.000 0.000 2.207 3.743 1.008 0.144 0.000 0.000 0.000 7.102 TOTAL HOURS OF VALID STABILITY DBSERVATIONS 2198 70TAL HOURS OF STABILITY CLASS B 152 TOTAL HOURS OF VALID WIND DIRECTION WIND SPEED STABILITY CLASS B 148 70TAL HOURS OF VALID WIND DIGICll0N WIND SPEED-STABILITY OBSERVATIONS 2084 70TAL HOURS CALM 0 METE 0kt4 M ICAL FeCILITY: Sequoyah Nuclear Plant

$7 ABILITY ittED ni DELTA T BETWEEN 9.25 AND 45.99 METERS WIND SPEED AND DIRECTION MEASURED AT 9.73 METER LEVEL DATE PRINTED: 27-Oct 97 MEAN WIND SPEED = 4.28 1

1 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS l

l

i f

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

Sequoyah Nuclear Plant i

JUL 1, 97 - SEP 30, 97 l

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 l

l A 0.000 0.000 0.000 0.240 0.096 0.000 0.000 0.000 0.000 0.336 i NNE 0.000 0.000 0.240 0.192 0.432 0.048 0.000 0.000 0.000 0.912 i NE 0.000 0.000 0.336 0.240 0.000 0.000 0.000 0.000 0.000 0.576 ENE 0.000 0.000 0.0% 0.000 0.000 0.000 0.000 0.000 0.000 0.096 j E 0.000 0.000 0.048 0.048 0.000 0.000 0.000 0.000 0.000 0.096 {

j ESE 0.000 0.000 0.144 0.000 0.000 0.000 0.000 0.000 0.000 0.144 l SE 0.000 0.000 0.096 0.000 0.000 0.000 0.000 0.000 0.000 0.0%

SSE 0.000 0.000 0.240 0.048 0.000 0.000 0.000 0.000 0.000 0.288 5 0.000 0.000 0.336 0.336 0.000 0.000 0.000 0.000 0.000 0.672 SSW 0.000 0.000 0.624 0.624 0.144 0.000 0.000 0.000 0.000 1.392 SW 0.000 0.000 0.192 0.576 0.000 0.003 0.000 0.000 0.000- 0.768 WSW 0.000 0.000 0.000 0.144 0.000 0.000 0.000 0.000 0.000 0.144 i W 0.000 0.000 0.048 0.000 0.000 0.048 0.000 0.000 0.000 0.096 I

WWW 0.000 0.000 0.000 0.048 0.000 0.000 0.000 0.000 0.000 0.c j a NW 0.000 0.000 0.000 0.000 0.096 0.048 0.000 0.000 0.000 ( .4 NNW 0.000 0.000 0.048 0.000 0.000 0.000 0.000 0.000 0.000 '0.048 SUBTOTAL 0.000 0.000 2.447 2.495 0.768 0.144 0.000 0.000 0.000 5.854-VOTAL HOURS OF VALID STABILITY OBSERVATIONS 2198 VOTAL HOURS OF STABILITY CLASS C 131 VOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED STABILITY CLASS C 122 TOTAL HOURS OF VALID WIND DIRECTION WIND SPEED STABILITY OBSERVATIONS 2084 TOTAL HOURS CALM 0 METEOROLOGICAL FACILITY: Sequoyah Nuclear Plant STABILITY BASED ON DELTA T BETWEEN 9.25 AND 45.99 METERS UIND SPEED AND DIRECTION MEASURED AT 9.73 METER LEVEL DATE PRINTED: 27-Oct 97 MEAN WIND SPEED = 4.05 COTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS l

1 J0!NT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS D (-1.5< DELTA Tc=-0.5 C/100 M)

Sequoyah Nuclear Plant JUL 1, 97 - SEP 30, 97 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 1.440 0.960 0.192 0.048 0.000 0.000 0.000 2.639-NNE 0.000 0.048 1.104 1.919 1.248 0.624 0.000 0.000 0.000 4.942 NE 0.000 0.048 0.576 0.000 0.144 0.048 0.000 0.000 0.000 0.816 ENE 0.000 0.000 0.192 0.000 0.000 0.000 0.000 0.000 0.000 0.192 E 0.000 0.000 0.048 0.000 0.000 0.000 0.000 0.000 0.000 0.048 ESE 0.000 0.000 0.096 0.000 0.048 0.000 0.000 0.000 0.000 0.144 SE 0.000 0.000 0.240 0.048 0.000 0.000 0.000 0.000 0.000 3.288 SSE 0.000 0.096 0.624 0.192 0.048 0.000 0.000 0.000 0.000 0.960 S 0.000 0.096 2.111 1.152 0.240 0.048 0.000 0.000 0.000 3.647 SSW 0.000 0.288 1.823 2.303 0.432 0.000 0.000 0.000 0.000 4.846 SW 0.000 0.096 1.536 0.768 0.144 0.000 0.000 0.000 C 2.543 Wsw 0.000 0.048 0.720 0.096 0.0% 0.048 0.000 0.000 0.000 1.008 (3 0.000 0.096 0.336 0.048 0.048 0.048 0.000 0.000 0.000 0.576 WNW 0.000 0.096 0.192 0.048 0.048 0.000 0.000 0.000 0.000 0.384 NW 0.000 0.144 0.432 0.0% 0.096 0.000 0.000 0.000 0.000 0.768 NNW 0.000 0.0% 0.240 0.384 0.192 0.048 0.000 0.000 0.000 0.960 SUB70TAL 0.000 1.152 11.708 8.013 2.9'/5 0.912 0.000 0.000 0.000 24.760 70TAL HOURS OF VALID STABILITY OBSERVATIONS 2198 VOTAL HOURS OF STABILITY CLASS D 543 70TAL HOURS OF VALID WIND DIRECTION WIND SPEED-STABILITY CLASS D 516 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2084 VOTAL HOURS CALM 0 l

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: 27-Oct 97 MEAN WIND SPEED = 3.73 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS

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, 97 - SEP 30, 97 WIND WIND SPEED (MPH)

DIRECTION CALM 0.6-1.4 1.5 3.4 3.5-5.4 5.57.4 7.5-12.4 12.5-18.4 18.5-24.4 >=24.5 TOTAL N 0.0 72 0.720 4.031 1.104 0.000 0.000 0.000 0.000 0.000 5.926 NNE 0.055 1.008 2.639 0.624 0.096 0.000 0.000 0.000 0.000 4.422 NE 0.011 0.528 0.192 0.000 0.000 0.000 0.000 0.000 0.000 0.731 ENE 0.004 0.192 0.096 0.000 0.000 0.000 0.000 0.000 0.000 0.292 E 0.003 0.144 0.048 0.048 0.000 0.000 0.000 0.000 0.000 0.243 ESE 0.002 0.096 0.048 0.000 0.000 0.000 0.000 0.000 0.000 0.146 SE 0.009 0.480 0.096 0.000 0.000 0.000 0.000 0.000 0.000 0.58'

$$E 0.010 0.432 0.240 0.000 0.000 0.000 0.000 0.000 0.000 0.68 5 0.028 0.768 1.056 0.000 0.000 0.000 0.000 0.000 0.000 1.7 SSW 0.055 0.864 2.783 0.432 0.048 0.000 0.000 0.000 0.000 4.h SW 0.050 0.768 2.495 0.768 0.240 0.000 0.000 0.000 0.000 4.320 WSW 0.020 0.288 1.008 0.144 0.048 0.000 0.000 0.000 0.000 1.507 W 0.010 0.336 0.336 0.000 0.000 0.000 0.000 0.000 0.000 0.682 WWW 0.009 0.288 0.288 0.096 0.048 0.048 0.000 0.000 0.000 0.776 NW 0.012 0.384 0.432 0.192 0.000 0.000 0.000 0.000 0.000 1.020 NNW 0.034 0.624 1.583 0.240 0.048 0.000 0.000 0.000 0.000 2.529 SUBTOTAL 0.3 84 7.917 17.370 3.64 7 0.528 0.048 0.000 0.000 0.000 29.894 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2198 TOTAL HOURS OF STABILITY CLASS E 654 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS E 623 TOTAL HOURS OF ALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2084 TOTAL HOURS CALM 8 l

METEOROLOGICAL FACILITY: Sequoyah Luclear Plant I

STABILITY BASED ON DELTA T EETWEEN 9.25 AND 45.99 HETERS WIND SPEED AND DIRECTION MEASURED AT 9.73 METER LEVEL DATE PRINTED: 27-Oct-97 MEAN WIND SPEED = 2.25 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS

T l ..

L l

l l l JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR i

STABILITY CLASS F ( 1.5< DELTA Tc= 4.0 C/100 M) _

l Sequoyah Nuclear Plant l JUL 1, 97 - SEP 30, 97 I

WIND WIND SPEED (MPH)

DIRECT!DN 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

, i 0.192 0.000 0.000 0.000 0.000 0.000 5.696

}

N 0.130 1.152 4.223 NNE 0.093 1.104 2.735 0.000 0.000 0.000 0.000 0.000 0.000 3.932 j NE 0.007 0.192 0.096 0.000 0.000 0.000 0.000 0.000 0.000 0.295 l ENE 0.005 0.192 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.197 E 0.005 0.192 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.197 ESE 0.005 0.192 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.197 SE 0.005 0.192 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.197 SSE 0.005 0.192 0.144 0.000 0.000 0.000 0.000 0.000 0.000 0.344 S 0.015 0.288 0.336 0.000 0.000 0.000 0.000 0.000 0.000 0.639

! SSW 0.016 0.096 0.576 0.000 0.000 0.000 0.000 0.000 0.000 0.688 l $3 0.007 0.0% 0.192 0.000 0.000 0.000 0.000 0.000 0.000 0.295 I WSW 0.005 0.096 0.0% 0.000 0.000 0.000 0.000 0.000 0.000 0.197 W 0.008 0.0% 0.240 0.000 0.000 0.000 0.000 0.000 0.000 0.344

, WWW 0.003 0.048 0.096 0.096 0.000 0.000 0.000 0.000 0.000 0.243 NW 0.008 0.144 0.192 0.000 0.000 0.000 0.000 0.000 0.000 0.344 NNW 0.016 0.192 0.480 0.048 0.000 0.000 0.000 0.000 0.000 0.7c 6 SUBTOTAL 0.336 4.463 9.405 0.336 0.000 0.000 0.000 0.000 0.000 14.539 70TAL HOURS OF VALID STABILITY OBSERVATIONS 2198 TOTAL HOURS OF STABILITY CLASS F 340 l VOTAL HOURS OF VALID WIND DIRECTION WIND SPEED STABILITY CLASS F 303 l TOTAL HOURS OF VALID WIND DIRECTION WIND SPEED-STABILITY OBSERVATIONS 2084 l

! TOTAL HUURS CALM 7 l

l METEOROLOGICAL FACILITY: Sequoyah Nuclear Plant STABILITY BASED ON DELTA-T BETWEEN 9.23 AND 45.99 METERS WIND SPEED AND DIRECTION MEASURED AT 9.73 METER LEVEL DATE PRINTED: 27-Oct 97 MEAN WIND SPEED e 1.80 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS l

t

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

Sequoyah Nuclear Plant

.JUL 1, 97 - SEP 30, 97 WIND WIND SPEED (MPH) i 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 k N 0.000 0.000 0.048 0.000 0.000 0.000 0.000 0.000 0.000 0.048 i NCE 0.000 0.048 0.144 0.000 0.000 0.000 0.000 0.000 0.000 0.192 NE 0.000 0.096 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.096 i ENE 0.000 0.096 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.096 E 0.000 0.048 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.048 ESE 0.000 0.048 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.048 SE 0.000 0.240 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.240 SSE 0.000 0.048 0.048 0.000 0.000 0.000 0.000 0.000 0.000 0.096 S 0.000 0.096 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.096 SSW 0.000 0.000 0.144 0.000 0.000 0.000 0.000 0.000 0.000 0.144

$9 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 U.000 0.000 0.000 0.000 0.000 0.000 W' O.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 WNW. 0.000 0.000 0.048 0.000 0.000 0.000 0.000 0.000 0.000 0.048 NW 0.000 0.000 0.000 0.048 0.000 0.000 0.000 0.000 0.000 0.048 NNW 0.000 0.048 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.048 SUB10TAL 0.000 0.768 0.432 0.048 0.000 0.000 0.000 0.000 0.000 1.248 l

l 70TAL HOURS OF VALID STABILITY OBSERVATIONS 2198 TOTAL HOURS OF STABILITY CLASS G 26 j TOTAL HOURS OF VALID WIND DIRECT 10N-WIND SPEED-STABILITY CLASS G 26 i TOTAL HbuRS OF VALID WIND DIRECTION WIND SPEED-STABILITY OBSERVATIONS 2084 (

l 70TAL HOURS CALM 0 l

l METEOROLOGICAL FACILITY: Sequoyah Nuclear Plant STABILITY BASED ON DELTA-T BETWEEN 9.25 AND 45.99 METERS L*!ND SPEED AND DIRECTION MEASURED AT 9.73 METER LEVEL DATE PRINTED: 27-Oct 97 MEAN WIND SPEED = 1.59 NOTEt TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS L.

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

Sequoyah Nuclear Plant OCT 1, 97 - DEC 31, 97 t$1ND 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 0.047 0.094 0.142 0.000 0.000 0.000 0.283 NNE 0.000 0.000 0.047 0.425 0.189 0.330 0.047 0.000 0.000 1.038 NE 0.000 0.000 0.094 0.378 0.236 0.047 0.000 0.000 0.000 0.755 l 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 0.047 0.000 0.000 0.000 0.000 0.000 0.000 0.047 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 0.047 0.094 0.000 0.000 0.000 0.000 '0.000 0.142 SSE 0.000 0.000 0.047 0.000 0.000 0.047 0.000 0.000 0.000 0.094 i S 0.000 0.000 0.047 0.094 0.094 0.094 0.000 0.000 0.000 0.330 SSW 0.000 0.000 0.094 0.378 0.094 0.000 0.000 0.000 0.000 0.566 SW 0.000 0.000 0.000 0.566 0.000 0.047 0.000 0.000 0.000 0.613 WSW 0.000 0.000 0.000 0.000 0.047 0.000 0.000 0.000 0.000 0.047 W 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 l

WNW 0.000 0.000 0.000 0.000 0.000 0.094 0.000 0.000 0.000 0.094 NW 0.000 0.000 0.000 0.000 0.330 0.047 0.000 0.000 0.000 0.3 78 NNW 0.000 0.000 0.000 0.000 0.047 0.000 0.000 0.000 0.000 0.047

$UBTOTAL 0.000 0.000 0.425 1.982 1.133 0.849 0.047 0.000 0.000 4.436 l

J VOTAL HOURS OF VALID STABILITY OBSERVATIONS 2135 VOTAL HOURS OF STABILITY CLASS A 94 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS A 94 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2119 TOTAL HOURS CALM 0 METEOROLOGICAL FACILITY: Sequoyah Nuclear Plant j '

STABILITY BASED ON DELTA-T BETWEEN 9.25 AND 45.99 METERS WIND SPEED AND DIRECTION MEASURED AT 9.73 METER LEVEL DATE PRINTED: 11-Feb-98 MEAN WIND SPEED a 5.71 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NU6ERS ,

1 l

l JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR l STA8!LITY CLASS B (-1.9< DELTA T<=-1.7 C/100 M)

Sequoyah Nuclear Plant OCT 1, 97 DEC 31, 97 l

d!ND WIND SPEED (MPH)

DIRECTION- CALM 0.6 1.4 1.5 3.4 3.5-5.4 5.57.4 7.5-12.4 12.5 18.4 18.5-24.4 >=24.5 TOTAL 1

N 0.000 0.000 0.000 0.142 0.000 0.000 0.000 0.000 0.000 0.142 l CNE 0.000 0.000 0.047 0.519 0.142 0.283 0.000 0.000 0.000 0.991 CE 0.000 0.000 0.189 0.283 0.094 0.000 0.000 0.000 0.000 0.566 ENE 0.000 0.000 0.047 0.047 0.000 0.000 0.000 0.000 0.000 0.094 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 0.094 0.047 0.000 0.000 0.000 0.000 0.000 0.142 SE 0.000 0.000 0.047 0.000 0.000 0.000 0.000 0.000 0.000 0.047 SSE 0.000 0.000 0.000 0.047 0.000 0.094 0.000 0.000 0.000 0.142 l S 0.000 0.000 0.047 0.142 0.094 0.000 0.000 0.000 0.000 0.283 l SSU 0.000 0.000 0.142 0.330 0.094 0.047 0.000 0.000 0.000 0.613 SW 0.000 0.000 0.142 0.283 0.094 0.094 0.000 0.000 0.000 0.613

. USS 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 J e 0.000 0.000 0.000 0.000 0.000 0.047 0.000 0.000 0.000 0.047

, WNW 0.000 0.000 0.000 0.000 0.000 0.047 0.000 0.000 0.000 0.047 l NW 0.000 0.000 0.000 0.000 0.047 0.000 0.000 0.000 0.000 0.047 l NNW 0.000 0.000 0.000 0.047 0.000 0.000 0.000 0.000 0.000 0.047 i

S0 TOTAL 0.000 0.000 0.755 1.888 0.566 0.613 0.000 0.000 0.000 3.823 I

l I

i TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2135 TOTAL HOURS OF STABILITY CLASS B 82 TOTAL HOURS OF VAllD WIND DIRECTION-WIND SPEED STABILITY CLASS B 81 T07AL HOURS OF VALID WIND DIRECTION WIND SPEED-STABILITY OBSERVATIONS 2119 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: 11-Feb-98 ]

MEAN WIND SPEED = 5.15 i j

NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS

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

! Sequoyah Nuclear Plant OCT 1, 97 - DEC 31, 97 l

UIND 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 0.094 0.236 0.094 0.047 0.000 0.000 0.000 0.472 NNE 0.000 0.000 0.330 0.708 0.519 0.189 0.000 0.000 0.000 1.746 j NE 0.000 0.000 0.142 0.236 0.047 0.000 0.000 0.000 0.000 0.425 ENE 0.000 0.000 0.330 0.047 0.000 0.000 0.000 0.000 0.000 0.378 l 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 0.094 0.000 0.000 0.000 0.000 0.000 0.000 0.094 l SE 0.000 0.000 0.047 0.047 0.000 0.000 0.000 0.000 0.000 0.094

( SSE 0.000 0.000 0.094 0.000 0.000 0.047 0.000 0.000 0.000 0.142 L S 0.000 0.000 0.094 0.000 0.047 0.094 0.000 0.000 0.000 0.236 d j SSW 0.000 0.000 0.142 0.236 0.000 0.000 0.000 0.000 0.000 0.378 S3 0.000 0.000 0.330 0.378 0.047 0.000 0.000 0.000 0.000 0.755 WSS 0.000 0.000 0.000 0.000 0.047 0.142 0.000 0.000 0.000 0.189 l e 0.000 0.000 0.000 0.000 0.047 0.000 0.000 0.000 0.000 0.047 WNW 0.000 0.000 0.047 0.000 0.094 0.047 0.000 0.000 0.000 0.189 l

NW 0.000 0.000 0.000 0.047 0.142 0.000 0.000 0.000 0.000 0.189 i NNW 0.000 0.000 0.047 0.000 0.189 0.047 0.000 0.000 0.000 0.283 l

f SLGi'OTAL 0.000 0.000 1.793 1.935 1.274 0.613 0.000 0.000 0.000 5.616

)

TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2135 .

TOTAL HOURS OF STABILITY CLASS C 119 TOTAL HOURS OF VALID WIND DIRECTION WIND SPEED-STABILITY CLASS C 119 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2119 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: 11 Feb-98 MEAN WIND SPEED = 4.85 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS f

t

(

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

Sequoyah Nuclear Plant OCT 1, 97 - DEC 31, 97

! WIND WIND SPEED (MPH) l DIREC710N CALM 0.6 1.4 1.5-3.4 3.5 5.' 5.5 7.4 7.5-12.4 12.5-18.4 18.5 24.4 >=24.5 TOTAL l N 0.000 0.142 2.548 2.879 1.274 0.472 0.000 0.000 0.000 '7.315 NNE 0.000 0.047 1.840 2.596 1.935 0.897 0.000 0.000 0.000 7.315 NE 0.000 0.094 0.944 0.203 0.142 0.047 0.000 0.000 0.000 1.510 l

i ECE 0.000 0.000 0.189 0.000 0.047 0.000 0.000 0.000 0.000 0.236 E 0.000 0.047 0.236 0.030 0.000 0.000 0.000 0.000 0.000 0.283 ESE 0.000 0.000 0.142 0.000 0.000 0.000 0.000 0.000 0.000 0.142 SE 0.000 0.047 0.236 0.0v0 0.000 0.000 0.000 0.000 0.000 0.283 SSE 0.000 0.047 0.330 0.047 0.142 0.283 0.000 0.000 0.000 0.849 l

, S 0.000 0.047 0.708 1.133 0.613 0.330 0.000 0.000 0.000 2.832 1 SSW 0.000 0.094 1.180 2.596 0.991 0.142 0.000 0.000 0.000 5.002 !

l S3 0.000 0.189 1.369 1.416 0.944 0.142 0.000 0.000 0.000 4.059 I WSU 0.000 0.047 0.613 0,,189 0.330 0.094 0.000 0.000 0.000 1.274 l

W 0.000 0.142 0.283 0.661 0.330 0.094 0.000 0.000 0.000 1.510 l WNM 0.000 0.047 0.283 0.566 0.283 0.094 0.000 0.000 0.000 1.274 NW 0.000 0.094 0.802 0.897 0.519 0.047 0.000 0.000 0.000 2.360

, NNW 0.000 0.425 1.369 1.274 0.755 0.378 0.000 0.000 0.000 4.200 l

SUB70TAL 0.000 1.510 13.072 14.535 8.306 3.020 0.000 0.000 0.000 40.444 707AL HOURS OF VALID STABILITY OBSERVATIONS 2135 l

i TOVAL HOURS OF STABILITY CLASS D 866 I TOVAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS D 857 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2119 TOTAL HOURS CALM 0 METEOROLOGICAL FACILITY: Sequoyah Nuclear Plant STABILITY BASED ON DELTA-T BETWEEN 9.25 AND 45.99 METERS I WIND SPEED AND DIRECTION MEASURED AT 9.73 METER LEVEL DATE PRINTED: 11-Feb-98 MEAb WIND SPEED = 4.33 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS

r JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR l

STABILITY CLASS E (-0.5< $ ELTA T<= 1.5 C/100 M)

Sequoyah Nuclear' Plrit OCT 1, 97 DEC 31, 97 l

l 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 0.093 0.566 3.728 2.029 0.047 0.000 0.000 0.000 0.000 6.464 l NNE 0.061 0.613 2.218 1.180 0.330 0.000 0.000 0.000 0.000 4.403 l NE 0.009 0.142 0.283 0.047 0.000 0.000 0.000 0.000 0.000 0.481

! ECE 0.005 0.094 0.142 0.000 0.000 0.000 0.000 0.000 0.000 0.241 E 0.006 0.189 0.094 0.000 0.000 0.000 0.000 0.000 0.000 0.289 ESE 0.006 0.142 0.142 0.000 0.000 0.000 0.000 0.000 0.000 0.289 j SE 0.002 0.094 0.000 0.047 0.000 0.000 0.000 0.000 0.000 0.144 I

SSE 0.006 0.094 0.189 0.094 0.047 0.000 0.000 0.000 0.000 0.431 S 0.028 0.425 0.849 0.566 0.047 0.000 0.000 0.000 0.000 1.915 SSU 0.033 0.330 1.180 0.708 0.000 0.000 0.000 0.000 0.000 2.251 SW 0.042 0.566 1.369 0.566 0.283 0.0c0 0.000 0.000 0.000 2.826 l WS9 0.011 0.047 0.472 0.283 0.094 f .000 - 0.000 0.000 0.000 0.908 I W 0.011 0.283 0.236 0.425 0.000 L'.000 0.000 0.000 0.000 0.955 WNW 0.020 0.236 0.708 0.189 0.000 0.000 0.000 0.000 0.000 1.153

( NW 0.030 0.378 0.991 0.189 0.000 0.000 0.000 0.000 0.000 1.587 l CI'W 0.060 0.236 2.548 0.142 0.000 0.000 0.000 0.000 0.000 2.986 l

SUBTOVAL 0.425 4.436 15.149 6.465 0.849 0.000 0.000 0.000 0.000 27.324 l

l TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2135 l TOTAL HOURS OF STABILITY CLASS E 584 l

j TOTAL HOURS OF VALID WIND DIRECTION WIND SPEED-STABILITY CLASS E 579 l VOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2119 TOTAL HOURS CALM 9 l

METEOROLOGICAL FACILITY: Sequoyah Nuclear Plant ,-

STABILITY BASED ON DELTA-T BETWEEN 9.25 AND 45.99 METERS WIND SPEED AND DIRECT!DN MEASURED AT 9.73 METER LEVEL DATE PRINTED: 11-Feb-98 MEAN WIND SPEED = 2.72 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS

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

Sequoyah Nuclear Plant DCT 1, 97 - DEC 31, 97

)

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 0 0.026 0. 75 5 2.643 0.236 0.000 0.000 0.000 0.000 0.000 3.659 CNE 0.035 1.274 3.398 0.189 0.000 0.000 0.000 0.000 0.000 4.896 NE 0.006 0.4 72 0.283 0.000 0.000 0.000 0.000 0.000 0.000 0.761 ENE 0.001 0.094 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.095 E 0.005 0.519 0.142 0.000 0.000 0.000 0.000 0.000 0.000 0.666 ESE 0.002 0.236 0.047 0.000 0.000 0.000 0.000 0.000 0.000 0.285 SE 0.002 0.189 0.142 0.000 0.000 0.000 0.000 0.000 0.000 0.333 l

$$E 0.003 0.236 0.142 0.000 0.000 0.000 0.000 0.000 0.000 0.380 I S 0.002 0.142 0.189 0.000 0.000 0.000 0.000 0.000 0.000 0.333 SSW 0.003 0.142 0.283 0.000 0.000 0.000 0.000 0.000 0.000 0.428 SW 0.002 0.000 0.283 0.000 0.000 0.000 0.000 0.000 0.000 0.285 WSW 0.001 0.000 0.094 0.000 0.000 0.000 0.000 0.000 0.000 0.095 d 0.001 0.000 0.094 0.000 0.000 0.000 0.000 0.000 0.000 0.095 WNW 0.001 0.047 0.047 0.047 0.000 0.000 0.000 0.000 0.000 0.142 I NW 0.001 0.000 0.094 0.047 0.000 0.000 0.000 0.000 0.000 0.142 NNW 0.04. 0.142 0.425 0.094 0.000 0.000 0.000 0.000 0.000 0.665 i

SUBTOTAL 0.094 4.247 8.306 0.613 0.000 0.000 0.000 0.000 0.000 13.261 !

TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2135 TOTAL HOURS OF STABILITY CLASS F 282 TOTAL HOURS OF VALID WIND DIRECTION WIND SPEED-STABILITY CLASS F 281 TOTAL HOURS OF WALID WIND DIRECTION-WIND SPEED STABILITY DBSERVAT10NS 2119 10TAL HOURS CALM 2 METEOROLOGICAL FACILITY: Sequoyeh 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: 11-Feb-98 MEAN WIND SPEED = 1.85

. NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS l

I

r

{

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

Sequoyah Nuclear Plant l

l OCT 1, 97 DEC 31, 97 dlND WIND SPEED (MPH)

DIREC710N 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 j- -

N 0.000 0.000 0.330 0.000 0.000 0.000 0.000 0.000 0.000 0.330

( NNE 0.000 0.330 0.991 0.000 0.000 0.000 0.000 0.000 0.000 1.321 NE 0.000 0.661 0.425 0.000 0.000 0.000 0.000 0.000 0.000 1.085 ENE 0.000 0.283 0.094 0.000 0.000 0.000 0.000 0.000 0.000 0.378 E 0.000 0.142 0.047 0.000 0.000 0.000 0.000 0.000 0.000 0.189 ESE 0.000 0.189 0.047 0.000 0.000 0.000 0.000 0.000 0.000 0.236 SE 0.000 0.283 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.283 l SSE 0.000 0.142 0.047 0.000 0.000 0.000 0.000 0.000 0.000 0.189 l S 0.000 0.236 0.142 0.000 0.000 0.000 0.000 0.000 0.000 0.378 l Ssw 0.000 0.047 0.425 0.000 0.000 0.000 0.000 0.000 0.000 0.472 l SW 0.000 0.000 0.142 0.047 0.000 0.0CJ _

0.000 0.000 0.000 .0.189

! WSU ' O.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 8 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000

)

WWW 0.000 0.000- 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 '

l NW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 l NNW 0.000 0.047 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.047 i

SU8 TOTAL 0.000 2.360 2.690 0.047 0.000 0.000 0.000 0.000 0.000 5.097 i

i 1

i I

l l

l l TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2135 l TOTAL HOURS OF STABILITY CLASS G 108 TOTAL HOURS OF VALID WIND DIRECTION WIND SPEED-STABILITY CLASS G 108 l

l TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVAil0NS 2119 TOTAL HOURS CALM 0 MEVEOROLOGICAL FACILITY: Sequoyah Nuclear Plant ST081LITY BASED ON DELTA T BETWEEN 9.25 AND 45.99 METERS WIND SPEED AND DIRECTION MEASURED AT 9.73 METER LEVEL DATE PRINTED: 11-Feb-98 MEAN WIND SPEED = 1.57 NOTE: TOTALS AND SUST0TALS ARE OBTAINED FROM UNROUNDED NUMBERS l

e JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION DISREGARDING STABILITY CLASS Sequoyah Nuclear Plant OCT 1, 97 - DEC 31, 97 WIND WIND SPEED (MPH)

DIRECT!DN 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 0.102 1.463 9.344 5.569 1.510 0.661 0.000 0.000 0.000 18.649 NNE 0.106 2.265 8.8 72 5.616 3.115 1.699 0.047 0.000 0.000 21.720 NE 0.035 1.369 2.360 1.227 0.519 0.094 0.000 0.090 0.000 5.604 ENE 0.012 0.4 72 0.802 0.094 0.047 0.000 0.000 0.000 0.000 1.428 E 0.014 0.897 0.566 0.000 0.000 0.000 0.000 0.000 0.000 1.477 ESE 0.011 0.566 0.566 0.047 0.000 0.000 0.000 0.000 0.000 1.191 SE 0.011 0.613 0.519 0.189 0.000 0.000 0.000 0.000 0.000 1.332 SSE 0.013 0.519 0.849 0.189 0.189 0.4 72 0.000 0.000 0.000 2.231 S 0.028 0.B49 2.076 1.935 0.897 0.519 0.000 0.000 0.000 6.3 04 SSW 0.038 0.613 3.445 4.247 1.180 0.189 0.000 0.000 0.000 9.713 SU 0.042 0. 755 3.634 3.256 1.369 0.283 0.000 0.000 0.000 9.338 )

WSW 0.012 9.094 1.180 0.472 0.519 0.236 0.000 0.000 0.000 2.513 l

M 0.010 0.425 0.613 1.085 0.378 0.142 0.000 0.000 0.000 2.653 l WNW 0.01' O.330 1.085 0.802 0.378 0.283 0.000 0.000 0.000 2.892 NW 0.022 0.472 1.888 1.180 1.038 0.094 0.000 0.000 0.000 4.694 NNW 0.050 0.849 4.389 1.5%7 0.991 0.425 0.000 0.000 0.000 8.261 l SUBTOTAL 0.519 12.553 42.190 27.466 12.128 5.097 0.047 0.000 0.000 100.000 TOTAL HOURS OF VALID WIND OBSERVATIONS 2119 TOTAL HOURS OF OBSERVATIONS 2208 RECOVERABILITY PERCENTAGE 96.0 TOTAL HOURS CALM 11 METEOROLOGICAL FACILITY: Sequoyah Nuclear Plant WIND SPEED AND DIRECTION MEASURED AT 9.73 METER LEVEL DATE PRINTED: 11-Feb-98 MEAN WIND SPEED = 3.54 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS

_

ML20217F089

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