ML11318A071

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2011/11/08 Watts Bar 2 OL - TVA Letter to NRC_11-07-11_FSAR Section 2.3
ML11318A071
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Site: Watts Bar Tennessee Valley Authority icon.png
Issue date: 11/08/2011
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Text

WBN2Public Resource From: Boyd, Desiree L [dlboyd@tva.gov]

Sent: Tuesday, November 08, 2011 8:03 AM To: Epperson, Dan; Poole, Justin; Raghavan, Rags; Milano, Patrick; Campbell, Stephen Cc: Arent, Gordon; Hamill, Carol L; Boyd, Desiree L

Subject:

TVA letter to NRC_11-07-11_FSAR Section 2.3 Attachments: 11-07-11_FSAR Section 2.3_Final.pdf Please see attached TVA letter that was sent to the NRC today.

Thank You,

~*~*~*~*~*~*~*~*~*~*~*~

Désireé L. Boyd WBN 2 Licensing Support Sun Technical Services dlboyd@tva.gov 423-365-8764 1

Hearing Identifier: Watts_Bar_2_Operating_LA_Public Email Number: 568 Mail Envelope Properties (7AB41F650F76BD44B5BCAB7C0CCABFAF250BF820)

Subject:

TVA letter to NRC_11-07-11_FSAR Section 2.3 Sent Date: 11/8/2011 8:02:53 AM Received Date: 11/8/2011 8:03:38 AM From: Boyd, Desiree L Created By: dlboyd@tva.gov Recipients:

"Arent, Gordon" <garent@tva.gov>

Tracking Status: None "Hamill, Carol L" <clhamill@tva.gov>

Tracking Status: None "Boyd, Desiree L" <dlboyd@tva.gov>

Tracking Status: None "Epperson, Dan" <Dan.Epperson@nrc.gov>

Tracking Status: None "Poole, Justin" <Justin.Poole@nrc.gov>

Tracking Status: None "Raghavan, Rags" <Rags.Raghavan@nrc.gov>

Tracking Status: None "Milano, Patrick" <Patrick.Milano@nrc.gov>

Tracking Status: None "Campbell, Stephen" <Stephen.Campbell@nrc.gov>

Tracking Status: None Post Office: TVANUCXVS2.main.tva.gov Files Size Date & Time MESSAGE 291 11/8/2011 8:03:38 AM 11-07-11_FSAR Section 2.3_Final.pdf 312253 Options Priority: Standard Return Notification: No Reply Requested: No Sensitivity: Normal Expiration Date:

Recipients Received:

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

U.S. Nuclear Regulatory Commission Page 3 November 7, 2011 bcc (Enclosure):

Stephen Campbell U.S. Nuclear Regulatory Commission MS 08H4A One White Flint North 11555 Rockville Pike Rockville, Maryland 20852-2738 Patricia Holahan, Acting Deputy Regional Administrator for Construction U. S. Nuclear Regulatory Commission Region II Marquis One Tower 245 Peachtree Center Ave., NE Suite 1200 Atlanta, Georgia 30303-1257

ENCLOSURE 1 Draft FSAR Section 2.3 Tables Tables Provided 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 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/m3, 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 0.5th Percentile 5th Percentile Direction X/Q Value (sec/m³) X/Q Value (sec/m³)

N 3.681E-04 3.460E-05 NNE 4.601E-04 6.261E-05 NE 5.285E-04 6.777E-05 ENE 6.276E-04 1.005E-04 E 6.382E-04 1.386E-04 ESE 6.309E-04 8.259E-05 SE 6.103E-04 4.620E-05 SSE 4.509E-04 2.383E-05 S 3.044E-04 2.664E-05 SSW 2.463E-04 2.498E-05 SW 3.080E-04 9.021E-06 WSW 3.244E-04 **

W 2.437E-04 **

WNW 1.471E-04 **

NW 1.640E-04 **

NNW 2.278E-04 **

All Directions Combined 9.297E-04 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

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 0.5th Percentile 5th Percentile Annual Average Direction X/Q Value (sec/m³) X/Q Value (sec/m³) X/Q Value (sec/m³)

N 8.003E-05 4.982E-06 8.135E-07 NNE 1.175E-04 1.139E-05 1.640E-06 NE 1.428E-04 1.178E-05 2.220E-06 ENE 1.698E-04 1.824E-05 2.255E-06 E 1.784E-04 2.669E-05 2.541E-06 ESE 1.703E-04 1.464E-05 2.640E-06 SE 1.554E-04 7.360E-06 1.568E-06 SSE 1.159E-04 2.844E-06 9.011E-07 S 6.924E-05 3.330E-06 7.804E-07 SSW 5.744E-05 2.958E-06 6.690E-07 SW 6.975E-05 5.074E-07 7.880E-07 WSW 7.696E-05 ** 6.594E-07 W 5.371E-05 ** 2.940E-07 WNW 2.669E-05 ** 2.754E-07 NW 3.036E-05 ** 2.080E-07 NNW 4.656E-05 ** 2.983E-07 All Directions Combined 2.798E-04 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

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/m³)

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

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)

Direction 8-hour 16-hour 3-day 26-day N 3.748E-05 2.565E-05 1.126E-05 3.453E-06 NNE 5.799E-05 4.074E-05 1.893E-05 6.302E-06 NE 7.173E-05 5.084E-05 2.409E-05 8.242E-06 ENE 8.312E-05 5.815E-05 2.679E-05 8.801E-06 E 8.835E-05 6.217E-05 2.900E-05 9.701E-06 ESE 8.549E-05 6.058E-05 2.869E-05 9.811E-06 SE 7.269E-05 4.971E-05 2.180E-05 6.672E-06 SSE 5.194E-05 3.476E-05 1.454E-05 4.163E-06 S 3.298E-05 2.276E-05 1.018E-05 3.207E-06 SSW 2.751E-05 1.904E-05 8.565E-06 2.721E-06 SW 3.324E-05 2.295E-05 1.027E-05 3.236E-06 WSW 3.503E-05 2.364E-05 1.006E-05 2.954E-06 W 2.270E-05 1.476E-05 5.800E-06 1.517E-06 WNW 1.253E-05 8.584E-06 3.779E-06 1.164E-06 NW 1.332E-05 8.821E-06 3.608E-06 9.999E-07 NNW 2.020E-05 1.331E-05 5.378E-06 1.464E-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.

E1-5

Table 2.3-66b Atmospheric Dispersion Factors (X/Q), sec/m3, 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*.

Minimum Distance to Low Population Period Exclusion Boundary Zone (hours)

(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 9.811E-06

  • Hourly 10-m 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.

E1-6

Table 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 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 2.034 1.223 0.957 0.692 0.547 132.25-199.75 1.177 0.680 0.565 0.413 0.304 154.75-222.25 0.828 0.565 0.494 0.361 0.250 192.25-259.75 0.895 0.609 0.532 0.382 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 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 0.001 0.014 0.065 0.118 0.136 0.006 0.000 0.000 0.340 NNE 0.000 0.000 0.016 0.097 0.152 0.219 0.007 0.000 0.000 0.490 NE 0.000 0.000 0.026 0.084 0.077 0.072 0.000 0.000 0.000 0.258 ENE 0.000 0.000 0.026 0.059 0.042 0.016 0.000 0.000 0.000 0.144 E 0.000 0.000 0.025 0.033 0.008 0.004 0.000 0.000 0.000 0.069 ESE 0.000 0.000 0.008 0.021 0.002 0.001 0.000 0.000 0.000 0.032 SE 0.000 0.001 0.016 0.016 0.006 0.004 0.000 0.000 0.000 0.042 SSE 0.000 0.000 0.029 0.041 0.012 0.010 0.001 0.000 0.000 0.093 S 0.000 0.001 0.041 0.117 0.129 0.099 0.015 0.000 0.000 0.402 SSW 0.000 0.001 0.037 0.300 0.537 0.562 0.022 0.000 0.000 1.459 SW 0.000 0.001 0.024 0.126 0.145 0.055 0.001 0.000 0.000 0.351 WSW 0.000 0.000 0.006 0.020 0.019 0.039 0.007 0.000 0.000 0.092 W 0.000 0.000 0.006 0.006 0.029 0.070 0.006 0.000 0.000 0.117 WNW 0.000 0.000 0.006 0.009 0.024 0.095 0.005 0.000 0.000 0.139 NW 0.000 0.000 0.004 0.009 0.028 0.087 0.011 0.000 0.000 0.138 NNW 0.000 0.000 0.009 0.027 0.059 0.124 0.011 0.000 0.000 0.230 SUBTOTAL 0.000 0.004 0.293 1.030 1.386 1.592 0.091 0.000 0.000 4.398 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 171942 TOTAL HOURS OF STABILITY CLASS A 7524 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS A 7473 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 169934 TOTAL HOURS CALM 0 METEOROLOGICAL FACILITY: WATTS BAR NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 9.51 AND 45.63 METERS WIND SPEED AND DIRECTION MEASURED AT 9.72 METER LEVEL MEAN WIND SPEED = 6.89 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS E1-8

Table 2.3-77 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 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 0.023 0.105 0.098 0.108 0.003 0.000 0.000 0.337 NNE 0.000 0.000 0.030 0.172 0.172 0.219 0.006 0.000 0.000 0.600 NE 0.000 0.000 0.058 0.139 0.078 0.059 0.000 0.000 0.000 0.334 ENE 0.000 0.000 0.041 0.083 0.035 0.008 0.000 0.000 0.000 0.167 E 0.000 0.001 0.026 0.048 0.005 0.001 0.000 0.000 0.000 0.081 ESE 0.000 0.001 0.019 0.026 0.001 0.000 0.000 0.000 0.000 0.047 SE 0.000 0.000 0.026 0.028 0.004 0.002 0.000 0.000 0.000 0.061 SSE 0.000 0.000 0.038 0.038 0.009 0.004 0.000 0.000 0.000 0.089 S 0.000 0.000 0.055 0.142 0.081 0.045 0.010 0.001 0.000 0.334 SSW 0.000 0.001 0.058 0.342 0.270 0.198 0.014 0.000 0.000 0.883 SW 0.000 0.000 0.026 0.179 0.069 0.019 0.000 0.000 0.000 0.294 WSW 0.000 0.000 0.008 0.040 0.015 0.019 0.001 0.000 0.000 0.084 W 0.000 0.000 0.005 0.015 0.031 0.047 0.009 0.000 0.000 0.107 WNW 0.000 0.001 0.004 0.013 0.037 0.082 0.006 0.000 0.000 0.143 NW 0.000 0.000 0.005 0.021 0.034 0.078 0.009 0.000 0.000 0.147 NNW 0.000 0.000 0.008 0.041 0.055 0.080 0.004 0.000 0.000 0.188 SUBTOTAL 0.000 0.004 0.430 1.432 0.996 0.970 0.063 0.001 0.000 3.895 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 171942 TOTAL HOURS OF STABILITY CLASS B 6670 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS B 6619 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 169934 TOTAL HOURS CALM 0 METEOROLOGICAL FACILITY: WATTS BAR NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 9.51 AND 45.63 METERS WIND SPEED AND DIRECTION MEASURED AT 9.72 METER LEVEL 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 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 0.058 0.163 0.134 0.149 0.004 0.000 0.000 0.508 NNE 0.000 0.001 0.108 0.255 0.214 0.233 0.013 0.000 0.000 0.824 NE 0.000 0.002 0.117 0.206 0.089 0.052 0.001 0.000 0.000 0.467 ENE 0.000 0.001 0.097 0.118 0.023 0.005 0.001 0.000 0.000 0.245 E 0.000 0.002 0.069 0.055 0.005 0.001 0.000 0.000 0.000 0.132 ESE 0.000 0.001 0.049 0.036 0.003 0.001 0.000 0.000 0.000 0.091 SE 0.000 0.002 0.062 0.045 0.004 0.001 0.000 0.000 0.000 0.114 SSE 0.000 0.002 0.074 0.071 0.009 0.003 0.001 0.000 0.000 0.159 S 0.000 0.001 0.116 0.252 0.085 0.047 0.006 0.001 0.000 0.508 SSW 0.000 0.001 0.152 0.464 0.255 0.171 0.012 0.000 0.000 1.056 SW 0.000 0.002 0.083 0.269 0.076 0.009 0.001 0.000 0.000 0.440 WSW 0.000 0.001 0.024 0.058 0.027 0.021 0.002 0.000 0.000 0.132 W 0.000 0.001 0.016 0.034 0.039 0.046 0.004 0.000 0.000 0.139 WNW 0.000 0.000 0.016 0.038 0.058 0.105 0.006 0.000 0.000 0.224 NW 0.000 0.000 0.021 0.042 0.052 0.095 0.009 0.000 0.000 0.219 NNW 0.000 0.000 0.034 0.070 0.072 0.101 0.006 0.000 0.000 0.282 SUBTOTAL 0.000 0.016 1.097 2.176 1.143 1.041 0.066 0.001 0.000 5.541 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 171942 TOTAL HOURS OF STABILITY CLASS C 9494 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS C 9416 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 169934 TOTAL HOURS CALM 0 METEOROLOGICAL FACILITY: WATTS BAR NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 9.51 AND 45.63 METERS WIND SPEED AND DIRECTION MEASURED AT 9.72 METER LEVEL MEAN WIND SPEED = 5.49 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS E1-10

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 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 0.004 0.048 0.664 0.970 1.049 1.087 0.024 0.000 0.000 3.847 NNE 0.004 0.047 0.702 1.162 1.020 0.979 0.057 0.002 0.000 3.973 NE 0.005 0.050 0.798 0.976 0.415 0.170 0.004 0.000 0.000 2.418 ENE 0.005 0.089 0.834 0.447 0.101 0.036 0.002 0.000 0.000 1.515 E 0.003 0.102 0.517 0.144 0.023 0.005 0.000 0.000 0.000 0.794 ESE 0.002 0.081 0.317 0.062 0.008 0.004 0.000 0.000 0.000 0.474 SE 0.003 0.087 0.392 0.082 0.024 0.013 0.000 0.001 0.000 0.602 SSE 0.004 0.120 0.620 0.178 0.039 0.032 0.009 0.000 0.000 1.003 S 0.008 0.159 1.179 0.760 0.288 0.280 0.083 0.004 0.000 2.762 SSW 0.011 0.136 1.736 1.934 0.922 0.770 0.059 0.001 0.000 5.567 SW 0.007 0.163 1.138 0.853 0.204 0.094 0.004 0.000 0.000 2.462 WSW 0.004 0.114 0.593 0.310 0.124 0.099 0.001 0.000 0.000 1.244 W 0.003 0.119 0.421 0.313 0.231 0.252 0.008 0.000 0.000 1.347 WNW 0.003 0.084 0.373 0.438 0.521 0.478 0.018 0.000 0.000 1.915 NW 0.002 0.059 0.372 0.427 0.567 0.598 0.040 0.001 0.000 2.067 NNW 0.003 0.035 0.481 0.558 0.655 0.839 0.035 0.000 0.000 2.607 SUBTOTAL 0.071 1.495 11.138 9.614 6.191 5.735 0.345 0.008 0.000 34.598 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 171942 TOTAL HOURS OF STABILITY CLASS D 59374 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS D 58793 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 169934 TOTAL HOURS CALM 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 E1-11

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 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 0.020 0.131 0.474 0.609 0.324 0.058 0.002 0.000 0.000 1.618 NNE 0.018 0.122 0.423 0.304 0.161 0.047 0.003 0.000 0.000 1.078 NE 0.025 0.149 0.598 0.350 0.061 0.011 0.004 0.000 0.000 1.197 ENE 0.033 0.208 0.790 0.188 0.012 0.002 0.001 0.000 0.000 1.235 E 0.018 0.237 0.322 0.043 0.012 0.002 0.000 0.000 0.000 0.636 ESE 0.009 0.157 0.130 0.022 0.007 0.004 0.000 0.000 0.000 0.330 SE 0.011 0.183 0.151 0.045 0.023 0.012 0.001 0.000 0.000 0.425 SSE 0.020 0.300 0.294 0.085 0.046 0.038 0.006 0.000 0.000 0.789 S 0.048 0.469 0.983 0.402 0.197 0.183 0.031 0.001 0.000 2.314 SSW 0.082 0.561 1.928 1.181 0.575 0.395 0.026 0.000 0.000 4.749 SW 0.068 0.701 1.348 0.308 0.109 0.052 0.002 0.000 0.000 2.588 WSW 0.050 0.713 0.800 0.141 0.077 0.031 0.000 0.000 0.000 1.810 W 0.046 0.703 0.687 0.201 0.078 0.029 0.000 0.000 0.000 1.745 WNW 0.040 0.617 0.600 0.295 0.100 0.041 0.001 0.000 0.000 1.693 NW 0.032 0.410 0.565 0.295 0.125 0.059 0.002 0.001 0.000 1.489 NNW 0.022 0.211 0.467 0.425 0.290 0.094 0.005 0.000 0.000 1.513 SUBTOTAL 0.543 5.873 10.559 4.895 2.197 1.057 0.084 0.002 0.000 25.209 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 171942 TOTAL HOURS OF STABILITY CLASS E 43451 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS E 42839 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 169934 TOTAL HOURS CALM 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 E1-12

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 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 0.026 0.227 0.173 0.017 0.000 0.001 0.000 0.000 0.000 0.444 NNE 0.022 0.181 0.165 0.010 0.002 0.001 0.000 0.000 0.000 0.381 NE 0.027 0.176 0.237 0.028 0.002 0.001 0.000 0.000 0.000 0.470 ENE 0.034 0.220 0.304 0.022 0.000 0.001 0.000 0.000 0.000 0.580 E 0.019 0.167 0.125 0.004 0.000 0.000 0.000 0.000 0.000 0.315 ESE 0.009 0.115 0.028 0.000 0.000 0.000 0.000 0.000 0.000 0.152 SE 0.009 0.107 0.035 0.004 0.001 0.002 0.000 0.000 0.000 0.157 SSE 0.014 0.152 0.058 0.009 0.002 0.001 0.001 0.000 0.000 0.236 S 0.033 0.272 0.238 0.033 0.003 0.001 0.000 0.000 0.000 0.580 SSW 0.066 0.424 0.594 0.150 0.009 0.004 0.000 0.000 0.000 1.247 SW 0.088 0.687 0.677 0.029 0.005 0.000 0.000 0.000 0.000 1.486 WSW 0.113 1.020 0.728 0.019 0.002 0.002 0.000 0.000 0.000 1.884 W 0.132 1.389 0.659 0.022 0.004 0.000 0.000 0.000 0.000 2.207 WNW 0.129 1.411 0.577 0.028 0.002 0.001 0.000 0.000 0.000 2.148 NW 0.110 1.159 0.546 0.034 0.004 0.000 0.000 0.000 0.000 1.852 NNW 0.046 0.436 0.272 0.038 0.004 0.001 0.000 0.000 0.000 0.796 SUBTOTAL 0.876 8.143 5.415 0.447 0.037 0.014 0.001 0.000 0.000 14.933 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 171942 TOTAL HOURS OF STABILITY CLASS F 25798 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS F 25377 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 169934 TOTAL HOURS CALM 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 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 0.021 0.215 0.071 0.002 0.000 0.000 0.000 0.000 0.000 0.309 NNE 0.018 0.177 0.068 0.000 0.000 0.000 0.000 0.000 0.000 0.263 NE 0.024 0.231 0.099 0.002 0.000 0.000 0.000 0.000 0.000 0.357 ENE 0.028 0.235 0.151 0.001 0.001 0.000 0.000 0.000 0.000 0.415 E 0.017 0.172 0.057 0.001 0.000 0.000 0.000 0.000 0.000 0.246 ESE 0.010 0.117 0.022 0.000 0.000 0.000 0.000 0.000 0.000 0.148 SE 0.012 0.141 0.022 0.000 0.000 0.000 0.000 0.000 0.000 0.175 SSE 0.013 0.151 0.028 0.001 0.000 0.000 0.000 0.000 0.000 0.193 S 0.023 0.267 0.056 0.002 0.001 0.000 0.000 0.000 0.000 0.349 SSW 0.039 0.405 0.137 0.006 0.001 0.000 0.000 0.000 0.000 0.589 SW 0.069 0.664 0.282 0.003 0.000 0.000 0.000 0.000 0.000 1.018 WSW 0.118 1.112 0.525 0.005 0.000 0.000 0.000 0.000 0.000 1.760 W 0.134 1.359 0.489 0.002 0.000 0.000 0.000 0.000 0.000 1.984 WNW 0.108 1.123 0.364 0.005 0.000 0.000 0.000 0.000 0.000 1.600 NW 0.097 0.930 0.405 0.003 0.000 0.000 0.000 0.000 0.000 1.435 NNW 0.039 0.383 0.159 0.004 0.000 0.000 0.000 0.000 0.000 0.585 SUBTOTAL 0.769 7.682 2.936 0.038 0.002 0.000 0.000 0.000 0.000 11.426 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 171942 TOTAL HOURS OF STABILITY CLASS G 19631 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS G 19417 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 169934 TOTAL HOURS CALM 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 E1-14

Table 2.3-83 JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY STABILITY CLASS WATTS BAR NUCLEAR PLANT JAN 1, 1991 - DEC 31, 2010 WIND SPEED STABILITY CLASS

_______________

(MPH) A B C D E F G CALM 0.000 0.000 0.000 0.071 0.543 0.876 0.769 0.6- 1.4 0.004 0.004 0.016 1.495 5.873 8.143 7.682 1.5- 3.4 0.293 0.430 1.097 11.138 10.559 5.415 2.936 3.5- 5.4 1.030 1.432 2.176 9.614 4.895 0.447 0.038 5.5- 7.4 1.386 0.996 1.143 6.191 2.197 0.037 0.002 7.5-12.4 1.592 0.970 1.041 5.735 1.057 0.014 0.000 12.5-18.4 0.091 0.063 0.066 0.345 0.084 0.001 0.000 18.5-24.4 0.000 0.001 0.001 0.008 0.002 0.000 0.000

>=24.5 0.000 0.000 0.000 0.000 0.000 0.000 0.000 TOTAL 4.398 3.895 5.541 34.598 25.209 14.933 11.426 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 171942 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS169934 TOTAL HOURS OF OBSERVATIONS 175320 JOINT RECOVERABILITY PERCENTAGE 96.9 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 E1-15

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