ML11314A116

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Meteorology Data for Accident Dose Analysis
ML11314A116
Person / Time
Site: Watts Bar Tennessee Valley Authority icon.png
Issue date: 11/07/2011
From: Stinson D
Tennessee Valley Authority
To:
Document Control Desk, Office of Nuclear Reactor Regulation
References
Download: ML11314A116 (17)
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Text

Tennessee Valley Authority, Post Office Box 2000, Spring City, Tennessee 37381-2000 November 7, 2011 10 CFR 100 ATTN: Document Control Desk U.S. Nuclear Regulatory Commission Washington, D.C. 20555-0001 Watts Bar Nuclear Plant, Unit 2 Docket No. 50-391

Subject:

Meteorology Data for Accident Dose Analysis

Reference:

TVA to NRC letter dated October 17, 2011, "Watts Bar Nuclear Plant (WBN) Unit 2 - Final Safety Analysis Report (FSAR) - Chapter 15.5 Fuel Handling Accident (FHA) Dose Analysis" The referenced letter provided hourly meteorology data for the 20-year period of 1991 to 2010 on optical media. This data was used to develop the dispersion factors for the accident dose analysis presented in FSAR Section 15.5.

Draft FSAR Section 2.3 Tables developed from the 20-year meteorology data are enclosed herein. The tables are being provided in advance of the submittal of WBN Unit 2 FSAR Amendment 107 in response to a verbal request from the NRC staff.

There are no new commitments in this submittal.

If you have any questions, please contact Gordon Arent at (423) 365-2004.

I declare under penalty of perjury that the foregoing is true and correct. Executed on the 7 th day of November 2011.

Respectfully, David Stinson Watts Bar Unit 2 Vice President

Pt U.S. Nuclear Regulatory Commission Page 2 November 7, 2011

Enclosure:

1.

Draft FSAR Section 2.3 Tables cc (Enclosure):

U. S. Nuclear Regulatory Commission Region II Marquis One Tower 245 Peachtree Center Ave., NE Suite 1200 Atlanta, Georgia 30303-1257 NRC Resident Inspector Unit 2 Watts Bar Nuclear Plant 1260 Nuclear Plant Road Spring City, Tennessee 37381

I-'L ENCLOSURE I Draft FSAR Section 2.3 Tables Tables Provided 2.3-61 b Calculated 1-Hour Average Atmospheric Dispersion Factors (X/Q) at Minimum Distance (1100 Meters)

Between Release Zone (100 m Radius) and Exclusion Area Boundary (1200 m Radius) for Watts Bar Nuclear Plant 2.3-62b Calculated 1-Hour Average and Annual Average Atmospheric Dispersion Factors (X/Q) at Low Population Zone Distance (4828 Meters) for Watts Bar Nuclear Plant 2.3-63b Values of 5th Percentile Overall Site 8-Hour, 16-Hour, 3-Day, and 26-Day Atmospheric Dispersion Factors (X/Q) at Low Population Zone Distance (4828 Meters) for Watts Bar Nuclear Plant 2.3-64b 0.5th Percentile Sector Values of 8-Hour, 16-Hour, 3-Day, And 26-Day Atmospheric Dispersion Factors (X/Q) at Low Population Zone Outer Boundary Distance (4828 Meters) for Watts Bar Nuclear Plant 2.3-66b Atmospheric Dispersion Factors (X/Q), sec/m 3, for Design Basis Accident Analyses Based on Onsite Meteorological Data for Watts Bar Nuclear Plant 2.3-67b Dispersion Meteorology - Onsite 10-Meter Wind Data - 5th Percentile Values of Inverse Wind Speed (1/u)

Distributions for Post-LOCA Control Bay Dose Calculations for Watts Bar Nuclear Plant 2.3 82 Joint Percentage Frequencies of Wind Direction and Wind Speed for Each Stability Class A through G (seven tables) 2.3-83 Joint Percentage Frequencies of Wind Speed by Stability Class Watts Bar Nuclear Plant E1-1

Table 2.3-61b Calculated 1-Hour Average Atmospheric Dispersion Factors (X/Q) at Minimum Distance (1100 Meters) Between Release Zone (100 m Radius) and Exclusion Area Boundary (1200 m Radius) for Watts Bar Nuclear Plant Based on RG 1.145 and Meteorological Data for 1991 through 2010*

Plume Sector Direction N

NNE NE ENE E

ESE SE SSE S

SSW SW WSW W

WNW NW NNW All Directions Combined 0.5th Percentile X/Q Value (sec/m3) 3.681E-04 4.601E-04 5.285E-04 6.276E-04 6.382E-04 6.309E-04 6.103E-04 4.509E-04 3.044E-04 2.463E-04 3.080E-04 3.244E-04 2.437E-04 1.471 E-04 1.640E-04 2.278E-04 9.297E-04 5th Percentile X/Q Value (sec/m3) 3.460E-05 6.261 E-05 6.777E-05 1.005E-04 1.386E-04 8.259E-05 4.620E-05 2.383E-05 2.664E-05 2.498E-05 9.021 E-06 5.486E-04 Meteorological facility located 0.8 km SSW of reactor site. Temperature instruments are 9.51 and 45.63 meters above ground. Wind speed and direction is measured at 9.72-meter level. Joint percent valid data in data base = 96.9.

Less than 5% of the hours had nonzero X/Q values.

E1-2

4 A.'

Table 2.3-62b Calculated 1-Hour Average and Annual Average Atmospheric Dispersion Factors (X/Q) at Low Population Zone Distance (4828 Meters) for Watts Bar Nuclear Plant Based on RG 1.145 and Meteorological Data for 1991 through 2010*

Plume Sector Direction N

NNE NE ENE E

ESE SE SSE S

SSW SW WSW W

WNW NW NNW All Directions Combined 0.5th Percentile X/Q Value (sec/m3) 8.003E-05 1.175E-04 1.428E-04 1.698E-04 1.784E-04 1.703E-04 1.554E-04 1.159E-04 6.924E-05 5.744E-05 6.975E-05 7.696E-05 5.371 E-05 2.669E-05 3.036E-05 4.656E-05 2.798E-04 5th Percentile X/Q Value (sec/m3) 4.982E-06 1.1 39E-05 1.1 78E-05 1.824E-05 2.669E-05 1.464E-05 7.360E-06 2.844E-06 3.330E-06 2.958E-06 5.074E-07 Annual Average X/Q Value (sec/m3 )

8.135E-07 1.640E-06 2.220E-06 2.255E-06 2.541 E-06 2.640E-06 1.568E-06 9.011 E-07 7.804E-07 6.690E-07 7.880E-07 6.594E-07 2.940E-07 2.754E-07 2.080E-07 2.983E-07 1.484E-04 Meteorological facility located 0.8 km SSW of reactor site. Temperature instruments are 9.51 and 45.63 meters above ground. Wind speed and direction is measured at 9.72-meter level. Joint percent valid data in data base = 96.9.

Less than 5% of the hours had nonzero X/Q values.

E1-3

,4 pJ-

£ Table 2.3-63b Values of 5th Percentile Overall Site 8-Hour, 16-Hour, 3-Day, and 26-Day Atmospheric Dispersion Factors (X/Q) at Low Population Zone Distance (4828 Meters) for Watts Bar Nuclear Plant Based on R.G. 1.145 Method of Logarithmic Interpolation between Overall 5th Percentile 1-hour X/Q Assumed to Apply for 2-hour Period and Maximum Sector Annual Average X/Q (underscored in Table 2.3-62b)*

Averaging period 5th Percentile X/Q Value (sec/mi3 )

8-hour 7.623E-05 16-hour 5.464E-05 3-day 2.652E-05 26-day 9.395E-06 1-hour and annual average X/Qs calculated from meteorological data for 1991 through 2010.

Meteorological facility located 0.8 km SSW of reactor site. Temperature instruments are 9.51 and 45.63 meters above ground. Wind speed and direction is measured at 9.72-meter level.

Joint percent valid data in data base = 96.9.

E1-4

A4 P.'

Table 2.3-64b 0.5th Percentile Sector Values of 8-Hour, 16-Hour. 3-Day, And 26-Day Atmospheric Dispersion Factors (X/Q) at Low Population Zone Outer Boundary Distance (4828 Meters) For Watts Bar Nuclear Plant Based on R.G. 1.145 Method of Logarithmic Interpolation between 0.5th Percentile 1-hour X/Q for Each Sector and Annual Average X/Q for Same Sector.*

Plume Sector Sector-Specific X/Q Value (sec/m3) uirection N

NNE NE ENE E

ESE SE SSE S

SSW SW WSW W

WNW NW NNW 8-hour 3.748E-05 5.799E-05 7.173E-05 8.312E-05 8.835E-05 8.549E-05 7.269E-05 5.194E-05 3.298E-05 2.751 E-05 3.324E-05 3.503E-05 2.270E-05 1.253E-05 1.332E-05 2.020E-05 I~16-hour 2.565E-05 4.074E-05 5.084E-05 5.815E-05 6.217E-05 6.058E-05 4.971 E-05 3.476E-05 2.276E-05 1.904E-05 2.295E-05 2.364E-05 1.476E-05 8.584E-06 8.821 E-06 1.331 E-05 I

3-day 1.1 26E-05 1.893E-05 2.409E-05 2.679E-05 2.900E-05 2.869E-05 2.180E-05 1.454E-05 1.018E-05 8.565E-06 1.027E-05 1.006E-05 5.800E-06 3.779E-06 3.608E-06 5.378E-06 I

26-day 3.453E-06 6.302E-06 8.242E-06 8.801 E-06 9.701 E-06 9.811 E-06 6.672E-06 4.163E-06 3.207E-06 2.721E-06 3.236E-06 2.954E-06 1.517E-06 1.164E-06 9.999E-07 1.464E-06 I

1-hour and annual average X/Qs calculated from meteorological data for 1991 through 2010.

Meteorological facility located 0.8 km SSW of reactor site. Temperature instruments are 9.51 and 45.63 meters above ground. Wind speed and direction is measured at 9.72-meter level.

Joint percent valid data in data base = 96.9.

E1-5

Table 2.3-66b Atmospheric Dispersion Factors (X/Q). seclm 3. for Design Basis Accident Analyses Based on Onsite Meteorological Data for Watts Bar Nuclear Plant Regulatory Guide 1.145 Results (maximum sector 0.5th percentile 1-hour value for 0-2 hours at exclusion area boundary and at low population zone; and 8-hour, 16-hour, 3-day and 26-day values for 2-8, 8-24, 24-96, and 96-720 hours from logarithmic interpolation between 0.5th percentile maximum sector 1-hour value at 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> and corresponding sector annual average value at 8760 hours0.101 days <br />2.433 hours <br />0.0145 weeks <br />0.00333 months <br /> at low population zone) for 1991 through 2010 Data*.

Period Minimum Distance to Low Population (hours)

Exclusion Boundary Zone (1100 m**)

(4828 m) 0-2 6.382E-04 1.784E-04 2-8 8.835E-05 8-24 6.217E-05 24-96 2.900E-05 96-720 9.811 E-06 Hourly 10-in wind and 10-m and 46-m temperature data.

Meteorological facility located 0.8 km SSW of reactor site.

Calms assigned a wind speed of 0.6 mph.

    • Travel distance from 100-m radius release zone to 1200-m exclusion area boundary distance.

El1-6

I,

-~

f Table 2.3-67b Dispersion Meteorology - Onsite 10-Meter Wind Data - 5th Percentile Values of Inverse Wind Speed (l/u) Distributions for Post-LOCA Control Bay Dose Calculations for Watts Bar Nuclear Plant January 1991 through December 2010 Wind Speed and Direction Data

  • Plume Sectors Averaging Periods (degrees) 1-hour 8-hour 16-hour 3-day 26-day 89.75-157.25 132.25-199.75 154.75-222.25 192.25-259.75 2.034 1.177 0.828 0.895 1.223 0.680 0.565 0.609 0.957 0.565 0.494 0.532 0.692 0.413 0.361 0.382 0.547 0.304 0.250 0.265 Meteorological facility is located 0.8 km SSW of reactor site.

Calms are assumed to be 0.6 mph.

E1-7

Table 2.3-76 Joint Percentage Frequencies of Wind Direction and Wind Speed for Different Stability Classes STABILITY CLASS A (DELTA T<=-1.9 C/100 M)

WATTS BAR NUCLEAR PLANT JAN 1, 1991 -

DEC 31, 2010 WIND DIRECTION N

NNE NE ENE E

ESE SE SSE S

SSW SW WSW W

WNW NW NNW SUBTOTAL WIND SPEED(MPH) 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 CALM 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000

>=24.5 TOTAL 0.001 0.000 0.000 0.000 0.000 0.000 0.001 0.000 0.001 0.001 0.001 0.000 0.000 0.000 0.000 0.000 0.004 0.014 0.016 0.026 0.026 0.025 0.008 0.016 0.029 0.041 0.037 0.024 0.006 0.006 0.006 0.004 0.009 0.293 0.065 0.097 0.084 0.059 0.033 0.021 0.016 0.041 0.117 0.300 0.126 0.020 0.006 0.009 0.009 0.027 1.030 0.118

0. 152 0.077 0.042 0.008 0.002 0.006 0.012 0.129 0.537 0.145 0.019 0.029 0.024 0.028 0.059 1.386 0.136 0.219 0.072 0.016 0.004 0.001 0.004 0.010 0.099 0.562 0.055 0.039 0.070 0.095 0.087 0.124 1.592 0.006 0.007 0.000 0.000 0.000
0. 000 0.000 0.001 0.015 0.022 0.001
0. 007 0.006 0.005 0.011 0.011 0.091 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.340 0.490 0.258 0.144 0.069 0.032 0.042 0.093 0.402 1.459 0.351 0.092 0.117 0.139 0.138 0.230 4.398 TOTAL HOURS OF VALID STABILITY OBSERVATIONS TOTAL HOURS OF STABILITY CLASS A TOTAL TOTAL TOTAL HOURS HOURS HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS A OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS CALM 171942 7524 7473 169934 0

METEOROLOGICAL FACILITY:

WATTS BAR NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 9.51 AND 45.63 METERS WIND SPEED AND DIRECTION MEASURED AT 9.72 METER LEVEL MEAN WIND SPEED =

6.89 NOTE:

TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS E1-8

Table 2.3-77

.1 Joint Percentage Frequencies of Wind Direction and Wind Speed for Different Stability Classes STABILITY CLASS B

(-1.9< DELTA T<=-1.7 C/100 M)

WATTS BAR NUCLEAR PLANT JAN 1, 1991 -

DEC 31, 2010 WIND SPEED(MPH) 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 WIND DIRECTION N

NNE NE ENE E

ESE SE SSE S

SSW SW WSW W

WNW NW NNW SUBTOTAL CALM 0.000 0.000 0.000 0.000

0. 000 0.000
0. 000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000
0. 000 0.000 0.000 0.000 0.000 0.001 0.001 0.000 0.000 0.000 0.001 0.000 0.000 0.000 0.001 0.000 0.000 0.004 0.023 0.030 0.058 0.041 0.026 0.019 0.026 0.038 0.055 0.058 0.026 0.008 0.005 0.004 0.005 0.008 0.430 0.105 0.172 0.139 0.083 0.048 0.026 0.028 0.038 0.142 0.342 0.179 0.040 0.015 0.013 0.021 0.041 1.432 0.098 0.172 0.078 0.035 0.005 0.001 0.004 0.009 0.081 0.270 0.069 0.015 0.031 0.037 0.034 0.055 0.996 0.108 0.219 0.059 0.008 0.001 0.000 0.002 0.004 0.045 0.198 0.019 0.019 0.047 0.082 0.078 0.080
0. 970 0.003 0.006 0.000 0.000 0.000 0.000 0.000 0.000 0.010 0.014 0.000 0.001 0.009 0.006 0.009 0.004 0.063 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.001 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.001 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.337
0. 600 0.334 0.167 0.081 0.047 0.061 0.089 0.334 0.883 0.294 0.084 0.107 0.143 0.147 0.188 3.895 TOTAL TOTAL TOTAL TOTAL TOTAL HOURS HOURS HOURS HOURS HOURS OF VALID STABILITY OBSERVATIONS OF STABILITY CLASS B OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS B OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS CALM 171942 6670 6619 169934 0

METEOROLOGICAL FACILITY:

WATTS BAR NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 9.51 AND 45.63 METERS WIND SPEED AND DIRECTION MEASURED AT 9.72 METER LEVEL MEAN WIND SPEED =

6.08 NOTE:

TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS E1-9

Table 2.3-78 Joint Percentage Frequencies of Wind Direction and Wind Speed for Different Stability Classes STABILITY CLASS C

(-1.7< DELTA T<=-1.5 C/100 M)

WATTS BAR NUCLEAR PLANT JAN 1, 1991 -

DEC 31, 2010 WIND SPEED(MPH) 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 WIND DIRECTION N

NNE NE ENE E

ESE SE SSE S

SSW SW WSW W

WNW NW NNW SUBTOTAL CALM 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.001 0.002 0.001 0.002 0.001 0.002 0.002 0.001 0.001 0.002 0.001 0.001 0.000 0.000 0.000 0.016 0.058 0.108 0.117 0.097 0.069 0.049 0.062 0.074 0.116 0.152 0.083 0.024 0.016 0.016 0.021 0.034 1.097 0.163 0.255 0.206 0.118 0.055 0.036 0.045 0.071 0.252 0.464 0.269 0.058 0.034 0.038 0.042 0.070 2.176 0.134 0.214 0.089 0.023 0.005 0.003 0.004 0.009 0.085 0.255 0.076 0.027 0.039 0.058 0.052 0.072 1.143 0.149 0.233 0.052 0.005 0.001 0.001 0.001 0.003 0.047 0.171 0.009 0.021 0.046 0.105 0.095 0.101 1.041 0.004 0.013 0.001 0.001 0.000 0.000 0.000 0.001 0.006 0.012 0.001 0.002 0.004 0.006 0.009 0.006 0.066 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.001 0.000 0.000

0. 000
0. 000 0.000 0.000 0.000 0.001 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000
0. 000 0.000 0.000 0.000 0.000 0.000 0.508 0.824 0.467 0.245 0.132 0.091 0.114 0.159 0.508 1.056 0.440 0.132 0.139 0.224 0.219 0.282 5.541 TOTAL TOTAL TOTAL TOTAL TOTAL HOURS HOURS HOURS HOURS HOURS OF VALID STABILITY OBSERVATIONS OF STABILITY CLASS C OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS C OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS CALM 171942 9494 9416 169934 0

METEOROLOGICAL FACILITY:

WATTS BAR NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 9.51 AND 45.63 METERS WIND SPEED AND DIRECTION MEASURED AT 9.72 METER LEVEL MEAN WIND SPEED =

5.49 NOTE:

TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS El-10

Table 2.3-79 Joint Percentage Frequencies of Wind Direction and Wind Speed for Different Stability Classes STABILITY CLASS D

(-1.5< DELTA T<=-0.5 C/100 M)

WATTS BAR NUCLEAR PLANT JAN 1, 1991 -

DEC 31, 2010 WIND DIRECTION N

NNE NE ENE E

ESE SE SSE S

SSW SW WSW W

WNW NW NNW SUBTOTAL WIND SPEED(MPH) 0.6-1.4 1.5-3.4 3.5-5.4 5.5-7.4 7.5-12.4 12.5-18.4 CALM 0.004 0.004 0.005 0.005 0.003

0. 002 0.003 0.004 0.008 0.011 0.007 0.004 0.003 0.003
0. 002 0.003 0.071 0.048 0.047 0.050 0.089
0. 102 0.081 0.087 0.120 0.159 0.136 0.163 0.114 0.119 0.084 0.059 0.035 1.495
0. 664 0.702 0.798 0.834 0.517 0.317 0.392
0. 620 1.179 1.736 1.138 0.593 0.421 0.373 0.372 0.481
11. 138 0.970 1.162 0.976 0.447 0.144 0.062 0.082 0.178 0.760 1.934 0.853 0.310 0.313 0.438 0.427
0. 558
9. 614 1.049 1.020 0.415 0.101
0. 023 0.008 0.024 0.039 0.288
0. 922 0.204
0. 124 0.231 0.521
0. 567
0. 655 6.191 1.087 0.979 0.170 0.036 0.005 0.004 0.013 0.032 0.280 0.770 0.094 0.099 0.252 0.478 0.598 0.839 5.735 0.024 0.057 0.004 0.002 0.000 0.000 0.000 0.009 0.083 0.059 0.004 0.001 0.008 0.018 0.040 0.035 0.345 18.5-24.4 0.000 0.002 0.000 0.000 0.000 0.000 0.001 0.000 0.004 0.001 0.000 0.000 0.000
0. 000 0.001 0.000 0.008

>=24.5 TOTAL 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 3.847 3.973 2.418 1.515 0.794 0.474

0. 602 1.003 2.762 5.567 2.462 1.244 1.347
1. 915
2. 067
2. 607 0.000 34.598 TOTAL TOTAL TOTAL TOTAL TOTAL HOURS HOURS HOURS HOURS HOURS OF VALID STABILITY OBSERVATIONS OF STABILITY CLASS D OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS D OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS CALM 171942 59374 58793 169934 121 METEOROLOGICAL FACILITY:

WATTS BAR NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 9.51 AND 45.63 METERS WIND SPEED AND DIRECTION MEASURED AT 9.72 METER LEVEL MEAN WIND SPEED =

4.86 NOTE:

TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS El-11

Table 2.3-80 Joint Percentage Frequencies of Wind Direction and Wind Speed for Different Stability Classes STABILITY CLASS E

(-0.5< DELTA T<= 1.5 C/100 M)

WATTS BAR NUCLEAR PLANT JAN 1, 1991 -

DEC 31, 2010 WIND SPEED (MPH) 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 WIND DIRECTION N

NNE NE ENE E

ESE SE SSE S

SSW SW WSW W

WNW NW NNW SUBTOTAL CALM 0.020 0.018 0.025 0.033 0.018 0.009 0.011 0.020 0.048 0.082 0.068 0.050 0.046 0.040

0. 032 0.022 0.543 0.131 0.122 0.149 0.208 0.237 0.157 0.183 0.300 0.469 0.561 0.701 0.713 0.703
0. 617 0.410 0.211 0.474 0.423 0.598 0.790 0.322 0.130 0.151 0.294 0.983
1. 928 1.348 0.800 0.687 0.600 0.565 0.467 0.609 0.304 0.350 0.188 0.043 0.022 0.045 0.085 0.402 1.181 0.308 0.141 0.201 0.295 0.295 0.425 4.895 0.324 0.161 0.061 0.012 0.012 0.007 0.023 0.046 0.197 0.575 0.109 0.077 0.078 0.100 0.125 0.290 2.197 0.058 0.047 0.011 0.002 0.002 0.004 0.012 0.038 0.183 0.395 0.052 0.031 0.029 0.041 0.059 0.094 1.057 0.002 0.003 0.004 0.001 0.000 0.000 0.001 0.006 0.031 0.026
0. 002 0.000 0.000 0.001 0.002 0.005 0.084 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.001 0.000 0.000 0.000 0.000 0.000 0.001 0.000 0.002 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 1.618 1.078 1.197 1.235 0.636 0.330 0.425 0.789 2.314 4.749 2.588 1.810 1.745 1.693 1.489 1.513 25.209 5.873 10.559 TOTAL HOURS OF VALID STABILITY OBSERVATIONS TOTAL HOURS OF STABILITY CLASS E TOTAL TOTAL TOTAL HOURS HOURS HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS E OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS CALM 171942 43451 42839 169934 923 METEOROLOGICAL FACILITY:

WATTS BAR NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 9.51 AND 45.63 METERS WIND SPEED AND DIRECTION MEASURED AT 9.72 METER LEVEL MEAN WIND SPEED 3.03 NOTE:

TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS El-12

Table 2.3-81 Joint Percentage Frequencies of Wind Direction and Wind Speed for Different Stability Classes STABILITY CLASS F

( 1.5< DELTA T<= 4.0 C/100 M)

WATTS BAR NUCLEAR PLANT JAN 1, 1991 -

DEC 31, 2010 WIND SPEED(MPH) 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 WIND DIRECTION N

NNE NE ENE E

ESE SE SSE S

SSW SW WSW W

WNW NW NNW SUBTOTAL CALM 0.026 0.022 0.027 0.034 0.019 0.009 0.009 0.014 0.033 0.066 0.088 0.113 0.132 0.129 0.110 0.046 0.876 0.227 0.181 0.176 0.220 0.167 0.115 0.107 0.152 0.272 0.424 0.687 1.020 1.389 1.411 1.159 0.436 8.143 0.173 0.165 0.237 0.304 0.125 0.028 0.035 0.058 0.238 0.594 0.677 0.728 0.659 0.577 0.546 0.272 5.415 0.017 0.010 0.028 0.022 0.004 0.000 0.004 0.009 0.033 0.150 0.029 0.019 0.022 0.028 0.034 0.038 0.447 0.000 0.002 0.002 0.000 0.000 0.000 0.001 0.002 0.003 0.009 0.005 0.002 0.004 0.002 0.004 0.004 0.037 0.001 0.001 0.001 0.001 0.000 0.000 0.002 0.001 0.001 0.004 0.000 0.002 0.000 0.001 0.000 0.001 0.014 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.001 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.001 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.444 0.381 0.470 0.580 0.315 0.152 0.157 0.236 0.580 1.247 1.486 1.884 2.207 2.148 1.852 0.796

14. 933 TOTAL HOURS OF VALID STABILITY OBSERVATIONS TOTAL HOURS OF STABILITY CLASS F TOTAL TOTAL TOTAL HOURS HOURS HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS F OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS CALM 171942 25798 25377 169934 1489 METEOROLOGICAL FACILITY:

WATTS BAR NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 9.51 AND 45.63 METERS WIND SPEED AND DIRECTION MEASURED AT 9.72 METER LEVEL MEAN WIND SPEED =

1.47 NOTE:

TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS E1-13

Table 2.3-82 Joint Percentage Frequencies of Wind Direction and Wind Speed for Different Stability Classes STABILITY CLASS G (DELTA T > 4.0 C/100 M)

WATTS BAR NUCLEAR PLANT JAN 1, 1991 -

DEC 31, 2010 WIND SPEED(MPH) 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 WIND DIRECTION N

NNE NE ENE E

ESE SE SSE S

SSW SW WSW W

WNW NW NNW SUBTOTAL CALM 0.021 0.018 0.024 0.028 0.017 0.010 0.012 0.013 0.023 0.039 0.069 0.118 0.134 0.108 0.097 0.039 0.769 0.215 0.177 0.231 0.235 0.172 0.117 0.141 0.151 0.267 0.405

0. 664 1.112 1.359 1.123
0. 930 0.383 7.682 0.071 0.068 0.099 0.151 0.057 0.022 0.022 0.028 0.056 0.137 0.282 0.525 0.489 0.364 0.405 0.159 2.936 0.002 0.000 0.002 0.001 0.001 0.000 0.000 0.001 0.002 0.006 0.003 0.005 0.002 0.005 0.003 0.004 0.038 0.000 0.000 0.000
0. 001 0.000
0. 000
0. 000
0. 000 0.001 0.001 0.000 0.000 0.000 0.000 0.000 0.000 0.002 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000
0. 000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.309 0.263
0. 357 0.415 0.246 0.148 0.175
0. 193 0.349 0.589 1.018 1.760
1. 984 1.600 1.435 0.585 11.426 TOTAL HOURS OF VALID STABILITY OBSERVATIONS TOTAL HOURS OF STABILITY CLASS G TOTAL TOTAL TOTAL HOURS HOURS HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS G OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS CALM 171942 19631 19417 169934 1306 METEOROLOGICAL FACILITY:

WATTS BAR NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 9.51 AND 45.63 METERS WIND SPEED AND DIRECTION MEASURED AT 9.72 METER LEVEL MEAN WIND SPEED 1.20 NOTE:

TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS El-14

Table 2.3-83 JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY STABILITY CLASS WATTS BAR NUCLEAR PLANT JAN 1, 1991 -

DEC 31, 2010 STABILITY CLASS B

C D

E WIND SPEED (MPH)

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 A

0.000 0.004 0.293 1.030 1.386 1.592 0.091 0.000 0.000 4.398 0.000 0.004 0.430 1.432 0.996 0.970 0.063 0.001 0.000 3.895 0.000 0.016 1.097 2.176 1.143 1.041 0.066 0.001 0.000 5.541 0.071 1.495 11.138

9. 614 6.191 5.735 0.345 0.008 0.000 34.598 0.543 5.873 10.559 4.895 2.197 1.057 0.084 F

0.876 8.143 5.415 0.447 0.037 0.014 0.001 0.000 0.000 14.933 G

0.769

7. 682 2.936 0.038 0.002 0.000 0.000 0.000
0. 000 11.426 0.002 0.000 25.209 171942 175320 96.9 TOTAL HOURS OF VALID STABILITY OBSERVATIONS TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS169934 TOTAL HOURS OF OBSERVATIONS JOINT RECOVERABILITY PERCENTAGE METEOROLOGICAL FACILITY:

STABILITY BASED ON DELTA-T BETWEEN WIND SPEED AND DIRECTION MEASURED AT 9.51 AND WATTS BAR NUCLEAR PLANT 45.63 METERS 9.72 METER LEVEL E1-15

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