ML103140664

OL - FW: 10-21-10_WBN U2 FSAR Section 2.3_NRC Copy 1 of 4.pdf

ML103140664
Person / Time
Site:	Watts Bar
Issue date:	10/21/2010
From:	Office of Nuclear Reactor Regulation
To:	Division of Operating Reactor Licensing
References
Download: ML103140664 (111)

Text

1 WBN2Public Resource From:

Poole, Justin Sent:

Thursday, October 21, 2010 4:29 PM To:

Brown, Leta Cc:

WBN2HearingFile Resource

Subject:

FW: 10-21-10_WBN U2 FSAR Section 2.3_NRC Copy 1 of 4.pdf Attachments:

10-21-10_WBN U2 FSAR Section 2.3_NRC Copy 1 of 4.pdf

Leta, Here is your section of the FSAR as it will appear in Amendment 101. This letter will be on the docket so you dont need to wait for the actual Amendment 101 to arrive. Note - due to the file size there are 4 emails which make up the entire document.

JustinC.Poole ProjectManager NRR/DORL/LPWB U.S.NuclearRegulatoryCommission (301)4152048 email:Justin.Poole@nrc.gov From: Boyd, Desiree L [1]

Sent: Thursday, October 21, 2010 4:13 PM To: Wiebe, Joel; Poole, Justin; Raghavan, Rags; Milano, Patrick; Campbell, Stephen Cc: Crouch, William D

Subject:

10-21-10_WBN U2 FSAR Section 2.3_NRC Copy 1 of 4.pdf Please see attached letter that was mailed to the NRC today.

I have broken this large file up into 4.

1 of 4 - FSAR Section 2.3

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

Désireé L. Boyd WBN2LicensingSupport SunTechnicalServices dlboyd@tva.gov 4233658764

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

Hearing Identifier:

Watts_Bar_2_Operating_LA_Public Email Number:

179 Mail Envelope Properties (19D990B45D535548840D1118C451C74D6FD3723A07)

Subject:

FW: 10-21-10_WBN U2 FSAR Section 2.3_NRC Copy 1 of 4.pdf Sent Date:

10/21/2010 4:28:39 PM Received Date:

10/21/2010 4:28:45 PM From:

Poole, Justin Created By:

Justin.Poole@nrc.gov Recipients:

"WBN2HearingFile Resource" <WBN2HearingFile.Resource@nrc.gov>

Tracking Status: None "Brown, Leta" <Leta.Brown@nrc.gov>

Tracking Status: None Post Office:

HQCLSTR02.nrc.gov Files Size Date & Time MESSAGE 1077 10/21/2010 4:28:45 PM 10-21-10_WBN U2 FSAR Section 2.3_NRC Copy 1 of 4.pdf 3402613 Options Priority:

Standard Return Notification:

No Reply Requested:

No Sensitivity:

Normal Expiration Date:

Recipients Received:

Tennessee Valley Authority, Post Office Box 2000, Spring City, Tennessee 37381-2000 October 21, 2010 10 CFR 50.4 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, D.C. 20555-0001 Watts Bar Nuclear Plant, Unit 2 Docket No. 50-391

Subject:

WATTS BAR NUCLEAR PLANT (WBN) - UNIT 2 - FINAL SAFETY ANALYSIS REPORT (FSAR), SECTION 2.3

References:

1. TVA letter to NRC dated August 30, 2010, Watts Bar Nuclear Plant (WBN) Unit 2 - Final Safety Analysis Report (FSAR) - Response to Requests for Additional Information

2. TVA letter to the NRC dated September 1, 2010, Watts Bar Nuclear Plant (WBN) - Unit 2 - Final Safety Analysis Report Amendment 100

3. TVA letter to NRC dated October 4, 2010, Watts Bar Nuclear Plant (WBN) Unit 2 - Final Safety Analysis Report (FSAR) - Response to Requests for Additional Information The purpose of this letter is to provide FSAR Section 2.3, Meteorology, in advance of FSAR, Amendment 101 being submitted in order to facilitate an NRC review request.

Changes to Section 2.3 are a result of previous NRC Requests for Additional Information (RAIs) with the responses to those RAIs provided in References 1 and 3. The attached advance FSAR Section 2.3 will be submitted as part of the FSAR Amendment 101. contains the text, tables, and figures for Section 2.3. Enclosure 2 provides the list of commitments made in this letter.

U.S. Nuclear Regulatory Commission Page 3 October 21, 2010 cc (Enclosures)

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 4 October 21, 2010 bcc (Enclosures):

Stephen Campbell U.S. Nuclear Regulatory Commission MS 08H4A One White Flint North 11555 Rockville Pike Rockville, Maryland 20852-2738 Loren R. Plisco, 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 WBN Unit 2 FSAR Section 2.3, Meteorology E1-1

METEOROLOGY 2.3-1 WATTS BAR WBNP-101 2.3 METEOROLOGY 2.3.1 Regional Climate 2.3.1.1 Data Sources Most of the climatic data summaries and other publications used in describing the site region meteorology are included in the list of references for Section 2.3. Those used in a general way not specifically referenced are the following: (1) U.S. Department of Commerce, Normal Weather Charts for the Northern Hemisphere, U. S. Weather Bureau, Technical Paper No. 21, October 1952, and (2) U.S. Department of Commerce, Climatic Atlas of the United States, Environmental Science Services Administration, Environmental Data Service, June 1968.

2.3.1.2 General Climate The Watts Bar site is in the eastern Tennessee portion of the southern Appalachian region. This area is dominated much of the year by the Azores-Bermuda anticyclonic circulation shown in the annual normal sea level pressure distribution (Figure 2.3-1).[1]

This dominance is most pronounced in late summer and early fall and is accompanied by extended periods of fair weather and widespread atmospheric stagnation. [2] In winter and early spring, the normal circulation becomes diffuse over the region as eastward moving migratory high-or low-pressure systems, identified with the mid-latitude westerly upper air circulation, bring alternately cold and warm air masses into the Watts Bar site area with resultant changes in wind, atmospheric stability, precipitation, and other meteorological elements. In the summer and early fall, the migratory systems are less frequent and less intense. Frequent incursions of warm, moist air from the Gulf of Mexico and occasionally from the Atlantic Ocean are experienced in the summer.

The site is primarily influenced by cyclones from the Southwest and Gulf Coast that translate toward the Northeast U.S. Coast by passing along either the west side or the east side of the Appalachian chain and by cyclones from the Plains or Midwest that move up the Ohio Valley. Topography around the site strongly influences the local climate. Mountain ranges located both northwest and southeast of the site, which is in the upper Tennessee River Valley, are oriented generally northeast-southwest and rise 3,000 to 4,000 feet MSL and, in places, 5,000 to 6,000 feet MSL. The latter elevations are in the Great Smoky Mountains to the east and southeast. They provide an orographic barrier that reduces the low-level atmospheric moisture from the Atlantic Ocean brought into the area by winds from the East. However, considerable low-level atmospheric moisture from the Gulf of Mexico is often brought into the area by winds from the south, southwest, or west.

The predominant air masses affecting the site area may be described as interchangeably continental and maritime in the winter and spring, maritime in the summer, and continental in the fall. Temperature patterns generally conform to the seasonal trends typical of continental, humid subtropical climates. Precipitation is normally well distributed throughout the year, but monthly amounts are generally

2.3-2 METEOROLOGY WATTS BAR WBNP-101 largest in the winter and early spring and smallest in the late summer and fall. The primary maximum occurs in March and is associated with cyclones passing through or near the region. A secondary maximum of precipitation occurs in July and is characteristically the result of diurnal thunderstorms occurring most frequently in the afternoon and evening. The minimum monthly precipitation normally occurs in October. Snow and sleet usually occur only during the period November through March and generally result from cold air pushing southward through the area against relatively warm, moist air.

2.3.1.3 Severe Weather Severe storms are relatively infrequent in east Tennessee, being east of the area of major tornadic activity, south of nearly all storms producing blizzard conditions, and too far inland to be affected often by the remnants of intense tropical cyclones. Damage from such remnants of tropical cyclones is rare, occurring only about once every 18 years, and is generally restricted to flood effects from heavy rains.[3]

The probability that a tornado will strike the Watts Bar site is low. During the period 1950-2009 (when climatological records are fairly complete) there were 38 tornadoes within 30 miles of the Watts Bar site, including 12 tornadoes F3/EF3 or greater [aa,bb].

The probability of a tornado striking the site can be calculated using the following equations according to NUREG/CR-4461, Rev. 2 [cc]. Using the principle of geometric probability described by H. C. S. Thom, [8] the probability of a tornado striking any point in the one degree latitude by one degree longitude square containing the plant site may be calculated. Thom's equations are the following:

P = mean probability of a tornado striking a point in any year in a one-degree square.

= mean path area of a tornado (mi2) t = mean number of tornadoes per year.

A = area of one-degree latitude, one-degree longitude square = 3887 mi2 for the one-degree square containing the Watts Bar site (84°W to 85°W by 35°N to 36°N).

R = mean recurrence interval for a tornado striking a point in the one-degree square (years).

P zt A----

=

(1)

R 1

P---

=

(2)

Z

METEOROLOGY 2.3-3 WATTS BAR WBNP-101 For z = 2.8209 mi2 (from H. C. S. Thom [8]) and t = 1.02 tornadoes per year (55 tornadoes from NUREG/CR-4461 divided by 54 years of record), the probability is 7.40 x 10-4 with a recurrence interval of 1351 years. For consideration in station blackout criteria, the annual expectation of tornadoes with winds exceeding 113 mph (F2/EF2 or greater) is 3.77 x 10-4 per square mile (t = 0.52, based on 28 tornadoes F2 and above 54 years).

Windstorms are relatively infrequent, but may occur several times a year. Strong winds are usually associated with thunderstorms that occur about 50 times per year based on records for Chattanooga and Knoxville (Table 2.3-1). Moderate and occasionally strong winds sometimes accompany migrating cyclones and air mass fronts. Wind records for Chattanooga exist for 1945-2009 (65 years)[dd], for Knoxville during 1943-2009 (67 years)[ee], and for Watts Bar meteorological tower during 1973-2009 (37 years). The extreme wind speed cases have been converted to 3-second gust equivalents for comparison (Table 2.3-1A). The highest observed wind speeds (3-second equivalent) are 102 mph on March 24, 1947 at Chattanooga, 88 mph on July 15, 1961 at Knoxville, and 59 mph on March 25, 1975 at Watts Bar meteorological tower. During 1950-2009, winds > 50 knots (> 57 mph) were reported an average of 16.33 times per year for Rhea County (which contains Watts Bar Nuclear Plant) and the 6 surrounding counties[ff] combined (Table 2.3-1B).

During 1950-2009, hail 3/4 inch in diameter or larger has been reported an average of 6.98 times per year for Rhea County and the 6 surrounding counties[ff] combined (Table 2.3-1B).The likelihood of hail (any size) for a specific location in the area is less than once per year, based on a 52-year record (1879-1930) at Chattanooga and a 60-year record (1871-1930) at Knoxville. [gg]

Annual lightning strike density is estimated to be 7.7 flashes to ground per km2 according to NUREG/CR-3759 [hh]. Based on thunderstorm day frequencies observed at Chattanooga (Table 2.3-1) the seasonal densities of flashes to ground per km2 are estimated to be 0.55 (winter), 2.17 (spring), 4.02 (summer), and 0.96 (fall). These seasonal densities were estimated by calculating the percent of the annual thunderstorm days during the season and multiplying by the annual lightning density value. For example, winter has 3.9 thunderstorm days out of the 55.1 annual total, or 7.1%. Applying 7.1% to the 7.7 annual flashes values results in the 0.55 seasonal flashes value for the winter season.

Relative potential for air pollution is indicated by the seasonal distribution of atmospheric stagnation cases of four days or more analyzed by Korshover.[15]In a 35-year period (1936-1970), there were about one case in the winter, 11 cases in the spring, 24 cases in the summer, and 34 cases in the fall. According to Holzworth [16]

there were about 35 forecast-days of high meteorological potential for air pollution in a 5-year period based on data collected in the 1960s and early 1970 (Figure 2.3-2). On the average, about seven air pollution forecast-days per year can be expected, with significantly greater probability in the summer and fall than in the winter and spring.

Frost penetration depth is important for protection of water lines and other buried structural features that are subject to freeze damage. The average depth for the 1899

2.3-4 METEOROLOGY WATTS BAR WBNP-101 through 1938 period was about six inches, and the extreme depth during the 1909 through 1939 period was about 14 inches.[17]

Estimations of regional glaze probabilities have been made by Tattelman, et al. [18] For Region V, which contains Tennessee, point probabilities for glaze icing 5.0 cm or more thick and 2.5 cm or more thick in any one year are about 1.0 x 10-4 and 4.0 x 10-4, respectively. These probabilities correspond to recurrences of about once in 10,000 years and about once in 2,500 years. Ice thicknesses of 2.0, 1.8, 1.7, and 1.5 cm correspond to return periods of 100, 50, 25, and 10 years.

All ice storms with glaze thicknesses 2.5 cm or greater that were analyzed were accompanied by maximum wind gusts 10 m/sec or greater. However, only one had maximum gusts 20 m/sec or greater, and that storm had ice thicknesses less than 5.0 cm.

The point probabilities for lesser ice thicknesses are about 0.20 for > 1.25 cm and 0.37 for > 0.63 cm, and the respective recurrence intervals are once in five years and once in three years. However, glaze ice thicknesses 1.25 cm or less generally result in little structural damage, except for above-ground utility wires when strong winds are combined with the storms. The major impact of storms which produce these lesser ice thicknesses is a hazard to travel in the affected areas.

Snowfall records for Chattanooga NWS (1937-2009) show maximum 24-hour and monthly snowfall amounts of 20.0 and 20.0 inches [dd]. Snowfall records for Knoxville NWS (1951-2009) show maximum 24-hour and monthly snowfall amounts of 18.2 and 23.3 inches [ee]. Older records for Knoxville before the NWS station was established show a maximum single storm of 22.5 inches [19]. The total snow load was calculated by assuming that the maximum single snowfall falls on the maximum snowpack. For the Watts Bar Site area, the weight of the 100-year return period snow pack is estimated to be about 14 pounds per square foot.[20]Assuming that the 22.5 inches of snow that fell at Knoxville on December 4-6, 1886, had the water equivalency ratio of 1:7, or 0.14 inch per inch of snow, the weight would be about 17 pounds per square foot. The combined weight of the existing snowpack, plus the new snow would be about 31 pounds per square foot on a flat surface. For conservatism, the weight of the maximum single storm snowfall recorded in Tennessee during the 1871 through 1970 period was estimated. This 28-inch snowfall occurred on February 19-21, 1960 at Westbourne, on the Cumberland Plateau in northeastern Tennessee.[21] A more conservative water equivalency ratio of 1:6 was used to give an estimated weight of about 24 pounds per square foot. The total snow load for this case would be about 38 pounds per square foot. Design loading considerations, including the snow load, for the reactor shield building and other Category I structures are presented in Sections 3.8.1 and 3.8.4, respectively.

No meteorological parameters were used in evaluating the performance of the ultimate heat sink, which consists of a once-through cooling system utilizing the Chickamauga Reservoir on the Tennessee River. A demonstration of adequate water flow past the site is used in the design bases. This is discussed in Section 2.4.11.

METEOROLOGY 2.3-5 WATTS BAR WBNP-101 The initial design conditions assumed for the Watts Bar Nuclear Plant reactor shield building (and other safety-related structures) are the following:

For the additional Diesel Generator Building and structures initiated after July 1979, the design basis tornado parameters are as follows:

These requirements have been recently updated by NRC. As defined in Regulatory Guide-1.76 (revision 1), the site is located on Region I for Design Basis Tornado considerations [ii]. The design conditions assumed for the Watts Bar Nuclear Plant reactor shield building (and other safety-related structures) are the following:

These and tornado-driven missile criteria are discussed in Sections 3.3 and 3.5. The fastest mile of wind at 30 feet above ground is about 95 mph for a 100-year return period in the site area.[22] The vertical distribution of horizontal wind speeds at 50, 100, and 150 feet above ground is 102, 113, and 120 mph on the basis of the speed at 30 feet and a power law exponent of 1/7. A gust factor of 1.3 is often used at the 30-foot level, but this would be conservative for higher levels. The wind load for the Shield Building is based on 95 mph for that level, as discussed in Section 3.3. Estimates of the probable maximum precipitation (PMP) and the design considerations for the PMP are discussed in Section 2.4.

(1) 300 mph

=

Rotational Speed (2) 60 mph

=

Translational Speed (3) 360 mph

=

Maximum Wind Speed (4) 3 psi

=

Pressure Drop (5) 1psi/sec

=

Rate of Pressure Drop (3 psi/3 sec is assumed)

(1) 290 mph

=

Rotational Speed (2) 70 mph

=

Translational Speed (3) 360 mph

=

Maximum Wind Speed (4) 3 psi

=

Pressure Drop (5) 2 psi/sec

=

Rate of Pressure Drop (3 psi/1.5 sec is assumed)

(1) 184 mph

=

Rotational Speed (2) 46 mph

=

Translational Speed (3) 230 mph

=

Maximum Wind Speed (4) 1.2 psi

=

Pressure Drop (5) 0.5 psi/sec

=

Rate of Pressure Drop (1.2 psi/2.4 sec is assumed)

2.3-6 METEOROLOGY WATTS BAR WBNP-101 2.3.2 Local Meteorology 2.3.2.1 Data Sources Short-term site-specific meteorological data from the TVA meteorological facility at the Watts Bar Nuclear Plant site are the basis for dispersion meteorology analysis. Data representative of the site or indicative of site conditions for temperature, precipitation, snowfall, humidity, fog, or wind were also obtained from climatological records for Chattanooga, Dayton, Decatur, Knoxville, Oak Ridge, and Watts Bar Dam, all in Tennessee. Short-term records for the Sequoyah Nuclear Plant site were used.

These data source locations are shown relative to the plant site in Figure 2.3-3.

2.3.2.2 Normal and Extreme Values of Meteorological Parameters Temperature data from Dayton [13] and Chattanooga[dd] are presented in Tables 2.3-2 and 2.3-3, respectively. The Chattanooga and Dayton mean daily data are provided as reasonably representative and recent (1971-2000) temperature information.

Normal mean dry-bulb temperatures range from 36.2-39.4°F in the winter to 76.9-79.6°F in the summer. Normal daily maximum temperatures range from 45.9-48.8°F in winter to 87.7-89.8°F in summer. Normal daily minimum temperatures range from 26.5-29.9°F in winter to 66.1-69.4°F in summer. The extreme maxima recorded for the respective data periods (46 years for Dayton and 70 years for Chattanooga) were 107°F at Dayton and 106°F at Chattanooga, while the extreme minima recorded were

-15°F and -10°F, respectively. Temperature data from Decatur (Table 2.3.2), for 60 years prior to data collection at Dayton, reported an extreme maximum temperature of 108°F and an extreme minimum temperature of -20°F.

Precipitation data are presented in Table 2.3-4. These data are from two different rain gauges near Watts Bar Nuclear Plant, one at Watts Bar Dam (1939-1975) and one at the Watts Bar Nuclear Plant meteorological tower (1974-2008). Precipitation has fallen an average of 110-111 days per year, with an annual average of 45.43 inches at the meteorological tower and 52.57 inches at Watts Bar Dam. The maximum monthly rainfall ranged from 6.52 inches to 14.78 inches. The minimum monthly amount was 0,00. The maximum rainfall in 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> was 5.31 inches at Watts Bar Dam in January 1946. The maximum in 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> at the meteorological tower was 4.77 inches on January 17, 1994. Mean monthly data reveal the wettest period as late fall through early spring, with March normally the wettest month of the year. Thunderstorm activity is most predominant in the spring and summer seasons, and the maximum frequency of thunderstorm days (Table 2.3-1) is normally in July.

Appreciable snowfall is relatively infrequent in the area. Snowfall data are summarized in Table 2.3-5 for Dayton[13] and in Table 2.3-6 for Chattanooga[dd] and Knoxville.[ee]

The Dayton, Chattanooga and Knoxville records provide current information and offer a complete picture of the pattern of snowfall in the Tennessee River Valley from Chattanooga to Knoxville. Mean annual snowfall has ranged from 4.4 inches at Dayton to about 10 inches at Knoxville. Dayton, about halfway between those locations, averaged about 4 inches annually for an earlier period of record. Generally, significant snowfalls are limited to November through March. For the data periods presented in the tables, respective 24-hour maximum snowfalls have been 20.0, 8.0, and 18.2

METEOROLOGY 2.3-7 WATTS BAR WBNP-101 inches at Chattanooga, Dayton, and Knoxville. Severe ice storms of freezing rain (or glaze) are infrequent, as discussed in the regional climatology section.

Atmospheric water vapor content is generally rather high in the site area, as was indicated in the discussion of the regional climatology. Long-term relative humidity and absolute humidity data for Chattanooga are presented in Tables 2.3-7 through 2.3-9.[dd,25] The relative humidity for selected hours in Table 2.3-7 has been updated to a more current period of record. Tables 2.3-8 and 2.3-9 cannot be easily updated, but are still valid since the information in Table 2.3-7 show no major changes in humidity characteristics. Humidity data based on measurements at the onsite meteorological facility are summarized in Tables 2.3-10 and 2.3-11 for comparison with the data in Tables 2.3-8 and 2.3-9. A typical diurnal variation is apparent in Table 2.3-7. Relative humidity and absolute humidity are normally greatest in the summer.

Fog data for Chattanooga,[dd] Knoxville,[ee] and Oak Ridge,[26] Tennessee, and from Hardwick [27] are presented in Table 2.3-12. These data indicate that heavy fog at the Watts Bar site likely occurs on about 35 days per year with the fall normally the foggiest season. Sources of data on fogs with visibilities significantly less than 1/4 mile and on durations of fogs which can be considered representative of the site have not been identified.

Wind direction patterns are strongly influenced by the northeast-southwest orientation of the major topographic features, as evidenced in the onsite data, Sequoyah Nuclear Plant data[28], and the records for Knoxville[ee] and Oak Ridge.[26] The Watts Bar wind direction and wind speed data are summarized in Tables 2.3-13 and 2.3-14 (annual at 10 and 46 meters); Tables 2.3-15 and 2.3-16 (directional persistence at 10 and 46 meters); and Tables 2.3-17 through 2.3-40 (monthly at 10 and 46 meters). The annual wind roses for each level are shown in Figures 2.3-4 and 2.3-5.

The most frequent wind direction at 10 meters has been from south-southwest (about 16%). The next highest frequencies (about 8%) are from the north-northeast and northwest wind. The data in Table 2.3-41 and the data in Table 2.3-13 show a predominance of wind from the north-northwest and northwest, respectively, for wind speeds less than about 3.5 mph. More discussion of this very light wind speed pattern is contained in Section 2.3.3.3. It is very significant that the frequencies of calms differ so markedly between the two sets of onsite data. It appears that the higher frequency of calm conditions is primarily a consequence of the location of the temporary meteorological facility in a "sink." The maximum wind direction persistence period at 10 meters is shown in Table 2.3-15 as 44 hours5.092593e-4 days <br />0.0122 hours <br />7.275132e-5 weeks <br />1.6742e-5 months <br /> from the south-southwest direction.

The monthly summaries show some minor variation in the wind direction patterns, but the upvalley-downvalley primary and secondary frequency maxima generally are fully evident.

In the summary tables for 46 meters, the upvalley-downvalley wind direction pattern is very clear and dominant. The two highest frequencies are 19% from the south-southwest wind direction and 11% from the north-northeast wind direction. The maximum wind direction persistence (Table 2.3-16) during the 17-year period was 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> from the south-southwest.

2.3-8 METEOROLOGY WATTS BAR WBNP-101 Wind speed is normally lower than for most parts of the United States. The other data sources referenced in the discussion of wind direction patterns also reflect this condition. Annually, the onsite data show about 53% of the hourly average wind speeds at 10 meters were less than 3.5 mph and about 85% were less than 7.5 mph.

At 46 meters, the respective frequencies show the wind speeds are relatively lighter in summer and early fall and relatively stronger in late fall, winter, and spring.

Mean mixing height data for the United States have been researched by Holzworth.[16]

However, his analysis has utilized data to estimate morning mixing heights (after sunrise) and mid afternoon mixing heights. Night-time mixing heights are not addressed. Average daily mixing heights are likely to be reasonably similar to the mean morning mixing heights. The seasonal and annual estimates of these mixing heights are the following: winter, about 500 meters; spring, about 530 meters; summer, about 430 meters; fall, about 350 meters; and annual, about 450 meters.

Low-level inversion frequencies in the eastern Tennessee area have been studied by Hosler.[29] His seasonal frequencies indicate inversions in the Watts Bar area about 40% of the time in winter, 30% in spring, 45% in summer, and 45% in fall. The annual frequency is about 40%. The monthly and annual percent frequencies of hours with inversions measured at the Watts Bar onsite meteorological facility for the 20-year period, 1974 through 1993, are presented in Table 2.3-42. In comparison to Hosler's seasonal and annual values, the winter, summer, and fall values are slightly lower and the spring value is higher and has the greatest departure. The highest monthly frequency in Table 2.3-42 is about 44% in October and the lowest is about 30% in January, with an annual average of about 39%. Monthly and annual frequencies of Pasquill stability classes A-G are also presented in the same table and indicate that the most stable time of year is the fall. Korshover's statistics on atmospheric stagnation cases[15] discussed under "General Climate," provide the same indication.

Table 2.3-44 presents a summary of onsite inversion persistence data, with a breakdown by stability class, for the same 20-year period discussed above.

Persistence in this case is defined as two or more consecutive hours with vertical temperature gradient (T) values > 0 degrees Celsius. However, the individual classes are allowed one-hour departures among themselves. The data analyzed correspond to the T interval between 10 and 46 meters above the ground. The longest periods of inversion were 45 hours5.208333e-4 days <br />0.0125 hours <br />7.440476e-5 weeks <br />1.71225e-5 months <br /> in January 1982 and 42 hours4.861111e-4 days <br />0.0117 hours <br />6.944444e-5 weeks <br />1.5981e-5 months <br /> in December 1989. Other long periods, up to 21 hours2.430556e-4 days <br />0.00583 hours <br />3.472222e-5 weeks <br />7.9905e-6 months <br />, occurred in winter. A combination of cold, dry air masses with the shorter length of the solar day in that half of the year and fresh snow on the ground surface can increase the probability for inversion durations greater than 14 hours1.62037e-4 days <br />0.00389 hours <br />2.314815e-5 weeks <br />5.327e-6 months <br /> in that time of year. The unusual case of 45 hours5.208333e-4 days <br />0.0125 hours <br />7.440476e-5 weeks <br />1.71225e-5 months <br /> of inversion persistence at this site occurred from January 19 to 21, 1982 at the end of a 10-day period of very cold weather. Persistent fog and low overcast with a synoptic pattern of warm air advection above an initially frozen, snow-covered ground surface and very light, variable winds at the 10-meter level created this condition.[30,31,32] The unusual case of 42 hours4.861111e-4 days <br />0.0117 hours <br />6.944444e-5 weeks <br />1.5981e-5 months <br /> of inversion persistence occurred from December 29-31, 1989 during a period in which a cold front stalled to the west of the site. All of Eastern Tennessee (including the Watts Bar site) was covered by heavy fog with occasional light rain and drizzle.[33, 34, 35]

METEOROLOGY 2.3-9 WATTS BAR WBNP-101 Distributions of stability classes A-G are presented in Figures 2.3-6A and 2.3-6B. The average diurnal variations of stability class frequencies are quite evident, with the neutral (class D) and unstable (A, B, and C) lapse conditions predominant in the daytime and the stable classes (E, F, and G) predominant through the nighttime.

2.3.2.3 Potential Influence of the Plant and Its Facilities on Local Meteorology The Watts Bar site is about 45 miles north-northeast of Chattanooga. It is located on the west shore of Chickamauga Lake on the Tennessee River, which flows generally southwesterly through eastern Tennessee. The site (about 700 feet MSL) is near the center of a northeast-southwest aligned valley, 10 to 15 miles wide, flanked to the west by Walden Ridge (900 to 1,800 feet MSL,) and to the east by a series of ridges reaching elevations of 800 to 1,000 feet MSL. Figure 2.1-3 consists of a map of the topographic features (as modified by the plant) of the site area for 10 miles in all directions from the plant. Profiles of maximum elevation versus distance from the center of the plant are shown in Figures 2.3-14 through 2.3-29 for the sixteen compass point sectors (keyed to true north) to a radial distance of 10 miles.

The only plant systems which may have any pragmatic effects on the local climatic patterns of meteorological parameters discussed in the preceding section are the two natural draft cooling towers and their blowdown discharge system. During their operation, some small increase in ambient atmospheric moisture and temperature can be expected from the vapor plumes discharged from the tower tops. Also, some increase in the surface water temperature of Chickamauga Lake will be associated with the discharge of heated water from the plant (primarily the cooling tower blowdown). The vapor plumes may produce some additional localized fog on rare occasions on top of Walden Ridge (about eight miles, at its closest point, to the west-northwest). The increased lake surface temperature will likely increase the frequency of river steam fog slightly over a relatively small area of the reservoir downstream from the plant. No significant environmental impacts are expected from these effects. Discontinuities in ambient thermal structure of the atmosphere related to differential surface temperatures between land and water should produce no detectable effect on the local wind patterns or stability conditions. The physical plant structures will alter wind and stability somewhat in the immediate lee of the structures by mechanical turbulence factors produced in the building wake(s). However, these effects are expected to be generally insignificant beyond the first one or two thousand feet downwind.

2.3.2.4 Local Meteorological Conditions for Design and Operating Bases All design basis meteorological parameters are discussed or referenced in Section 2.3.1.3.

2.3.3 Onsite Meteorological Measurements Program 2.3.3.1 Preoperational Program Onsite meteorological facilities have been in operation since 1971 when a temporary 40-meter (130-foot) instrumented tower was installed. It was located about 760 meters (0.5 mile) west-southwest of the unit 1 Reactor Building and had a base elevation of

2.3-10 METEOROLOGY WATTS BAR WBNP-101 2 meters (8 feet) below plant grade. The temporary facility collected wind speed, wind direction, and temperature data at the 10-meter (33-foot) and 40-meter levels until it was decommissioned in September 1973. Since the FSAR dispersion meteorology data base was collected exclusively by the permanent facility, only that facility is described in detail in this section.

Permanent Meteorological Facility The permanent meteorological facility consists of a 91-meter (300-foot) instrumented tower for wind and temperature measurements, a separate 10-meter (33-foot) tower for dewpoint measurements, a ground-based instrument for rainfall measurements, and an environmental data station (EDS), which houses the data processing and recording equipment. A system of lightning and surge protection circuitry and proper grounding is included in the facility design. This facility is located approximately 760 meters south-southwest of the Unit 1 Reactor Building and has a base elevation of 4 meters (11 feet) below plant grade.

Data collected included: (1) wind direction and wind speed at 10, 46, and 91 meters; (2) temperature at 10, 46, and 91 meters; (3) dewpoint at 10 meters and (4) rainfall at 1 meter (3 feet). More exact measurement heights for the wind and temperature parameters are given in the EDS manual.[37] Elsewhere in the text of this document, temperature and wind sensor heights are given as 10, 46, and 91 meters.

Data collection at the permanent facility began May 23, 1973, with measurements of wind speed and wind direction at 10 and 93 meters (305 feet), temperature at 1, 10, 46, and 91 meters and dewpoint, and rainfall at 1 meter. Measurements of 46-meter wind speed and wind direction and 10-meter dewpoint began September 16, 1976.

Measurements of 1-meter dew point were discontinued September 30, 1977. Wind Sensors at 93-meter (actual height was 93.3 meters) were moved to their present height on May 18, 1978. Measurements of 1-meter temperature were discontinued on April 2, 1981. The 10-meter dewpoint sensor was removed from the meteorological tower and a new dewpoint sensor was installed on a separate tower 24 meters to the northwest on April 11, 1994.

Instrument Description A description of the meteorological sensors follows. More detailed sensor specifications are included in the EDS Manual. Replacement sensors, which may be of a different manufacturer or model, will satisfy the Regulatory Guide (RG)1.23 (Revision 1) specifications.[36]

METEOROLOGY 2.3-11 WATTS BAR WBNP-101 Data Acquisition System The previous data collection system, which included a NOVA minicomputer, was replaced by a new system on March 2, 1989. This data acquisition system is located at the EDS and consists of meteorological sensors and a computer. These devices send meteorological data to the plant, to the Central Emergency Control Center (CECC) and to an offsite computer that enables callup for data validation and archiving.

System Accuracies The meteorological data collection system is designed and replacement components are chosen to meet or exceed specifications for accuracy identified in RG 1.23.

The meteorological data collection system satisfies the RG 1.23 accuracy requirements. A detailed listing of error sources for each parameter is included in the EDS manual.

Data Recording and Display The data acquisition is under control of the computer program. The output of each meteorological sensor is scanned periodically, scaled, and the data values are stored.

Meteorological sensor outputs are measured at the following rates: horizontal wind direction and wind speed, every five seconds (720 per hour); temperature and dewpoint, every minute (60 per hour); and rainfall, every hour (one per hour). Prior to February 1, 1975, only one reading of temperature and dewpoint was made each hour.

Software data processing routines within the computer accumulate output and perform data calculations to generate 15-minute and hourly average of wind speed and temperature, 15-minute and hourly vector wind speed and direction, hourly average of dewpoint, hourly horizontal wind direction sigmas, and hourly total precipitation. Prior to February 11, 1987, a prevailing wind direction calculation method was used.

Subsequently, vector wind speed and direction have been calculated along with arithmetic average wind speed.

Sensor Height (Meters)

Description Wind Direction and Wind Speed 10, 46, and 91 Ultrasonic wind sensor.

Temperature 10, 46, and 91 Platinum wire resistance temperature detector (RTD) with aspirated radiation shield.

Dewpoint 10 Capacitive humidity sensor.

Rainfall 1

Tipping bucket rain gauge.

2.3-12 METEOROLOGY WATTS BAR WBNP-101 Selected data each 15 minutes and all data each hour are stored for remote data access.

Data sent to the plant control room every minute includes 10-, 46-, and 91-meter values for wind direction, wind speed, and temperature.

Data sent to the CECC computer every 15 minutes includes 10-, 46-, and 91-meter wind direction, wind speed, and temperature values. These data are available from the CECC computer to other TVA and the State emergency centers in support of the Radiological Emergency Plan, including the Technical Support Center at Watts Bar.

Remote access of meteorological data by the NRC is available through the CECC computer.

Data are sent from the EDS to an offsite computer for validation, reporting, and archiving.

Equipment Servicing, Maintenance, and Calibration The meteorological equipment at the EDS is kept in proper operating condition by staff that are trained and qualified for the necessary tasks.

Most equipment is calibrated or replaced at least every six months of service. The methods for maintaining a calibrated status for the components of the meteorological data collection system (sensors, electronics, data logger, etc.) include field checks, field calibration, and/or replacement by a laboratory calibrated component. More frequent calibration and/or replacement intervals for individual components may be conducted, on the basis of the operational history of the component type. Procedures and processes such as appropriate maintenance processes (procedures, work order/work request documents, etc.) are used to calibrate and maintain meteorological and station equipment.

2.3.3.2 Operational Meteorological Program The operational phase of the meteorological program includes those procedures and responsibilities related to activities beginning with the initial fuel loading and continuing through the life of the plant. This phase of the meteorological data collection program will be continuous without major interruptions. The meteorological program has been developed to be consistent with the guidance given in RG 1.23 (Revision 1) and the reporting procedure in RG 1.21 (Revision 1).[40] The basic objective is to maintain data collection performance to assure at least 90% joint recoverability and availability of data needed for assessing the relative concentrations and doses resulting from accidental or routine releases.

The restoration of the data collection capability of the meteorological facility in the event of equipment failure or malfunction will be accomplished by replacement or repair of affected equipment. A stock of spare parts and equipment is maintained to minimize and shorten the periods of outages. Equipment malfunctions or outages are detected by maintenance personnel during routine or special checks. Equipment outages that affect the data transmitted to the plant can be detected by review of data displays in the reactor control room. Also, checks of data availability to the emergency

METEOROLOGY 2.3-13 WATTS BAR WBNP-101 centers are performed each work day. When an outage of one or more of the critical data items occurs, the appropriate maintenance personnel will be notified.

In the event that the onsite meteorological facility is rendered inoperable, or there is an outage of the communication or data access systems; there is no fully representative offsite source of meteorological data for identification of atmospheric dispersion conditions. Therefore, TVA has prepared objective backup procedures to provide estimates for missing or garbled data. These procedures incorporate available onsite data (for a partial loss of data), offsite data, and conditional climatology. The CECC meteorologist will apply the appropriate backup procedures.

2.3.3.3 Onsite Data Summaries of Parameters for Dispersion Meteorology Annual joint frequency distributions of wind speed by wind direction for Pasquill atmospheric stability classes A-G, based on the onsite data for January 1974 through December 1993 are presented in Tables 2.3-45 through 2.3-52. These tables are summaries of hourly data for the wind at 10 meters and vertical temperature difference (T) between 10 and 46 meters (in the form of stability classes A-G). Tables 2.3-53 through 2.3-60 were prepared from the hourly data for the wind at 46 meters and T between 10 and 46 meters (as stability classes A-G) for January 1977 through December 1993. The frequency distributions in Tables 2.3-45 through 2.3-51 are also displayed in Figures 2.3-7 through 2.3-13.

The upvalley-downvalley primary wind pattern at 46 meters exists for all seven stability classes. The 10-meter wind level also shows upvalley-downvalley wind direction patterns. However, for classes E-G, the flow patterns become progressively more diffuse, with peaks from the northwest which become primary maxima in classes F and G (Tables 2.3-50 and 2.3-51). These directional peaks for the stable classes are most pronounced in the lighter wind speed ranges. The combination of these very light winds with the more stable conditions near the earth's surface indicate that very poor atmospheric dispersion conditions for ground-level plant releases of air-borne effluent occur most frequently at night and with the northwest wind direction.

The period of record for the joint frequency tables for the 46-meter wind measurement level is three years shorter than the record used for the 10-meter wind level. Collection of wind data at the 46-meter level began in September 1976. Tables 2.3-53 through 2.3-60 were originally prepared with 93-meter wind data and 10- to 91-meter T data for the July 1973-June 1975 period. The 46-meter wind level is near the height of the reactor building; and the 10- to 46-meter T interval is more representative than the 10- to 91-meter interval for stability classification, particularly for poorer dispersion conditions. The 10-meter wind level is applicable to design accident analysis and to semiannual reports on routine plant operations. The 46-meter wind level is used in radiological emergency dispersion and transport calculations.

The 20-year period for the tables with 10-meter wind data and the 17-year period for the tables with 46-meter wind data reasonably represent long-term dispersion conditions at the site. The length of the record is an important factor, and patterns of unusually wet weather in the 1970s and unusually dry weather in the 1980s are included in this data base. The dispersion meteorology varied during the 20-year

2.3-14 METEOROLOGY WATTS BAR WBNP-101 period, but the period is climatologically representative of long-term conditions. An increase in the frequency of 10-meter level calm winds (values less than 0.6 mi/hr) occurred in the early 1990s. The calm wind frequency increased from 1.6% for 1974-1988 to about 3.0% for 1974-1993. Consistent with the increase in calms, average wind speed decreased from 4.2 mi/hr for 1974-1988 to 4.1 mi/hr for 1974-1993.

Potential climate change associated with a global warming of the earth's lower atmosphere may occur in the Watts Bar site area. Should that occur during the life of this nuclear plant, the dispersion meteorology will be evaluated for any significant changes and consequent impacts on plant design and operation.

2.3.4 Short-Term (Accident) Diffusion Estimates 2.3.4.1 Objective Revised estimates of atmospheric diffusion expressed as dispersion factors (X/Q) have been calculated for accident releases considered as ground-level releases from the Watts Bar Nuclear Plant for specified time intervals and distances. The revised X/Q values are based on an updated onsite meteorological data base for 1974 through 1993 and RG 1.145 calculation methodology.[41] The original FSAR calculations were based on data collected at the Watts Bar onsite meteorological facility for the period July 1, 1973 through June 30, 1975 and R.G. 1.4 methodology.[42] All data used include wind direction and wind speed at 10 meters above ground and vertical temperature difference (T) between 10 and 46 meters above ground. The revised X/Q values at the exclusion area boundary and at the outer boundary of the low population zone (LPZ) were calculated as stated below.

Nomenclature for RG 1.145 Method X/Q = centerline ground-level relative concentration (sec/m3) y = lateral plume spread with meander and building wake effects (m), as a function of atmospheric stability, wind speed <<10, and distance (for distances greater than 800 meters, y = (M-1)y800m + y).

y = lateral plume spread as a function of atmospheric stability and distance (m).

z = vertical plume spread as a function of atmospheric stability and distance (m).

x = distance from effluent release point to point at which atmospheric dispersion factors (X/Q values) are computed (m).

= mean hourly horizontal wind speed at 10 meters (m/sec)

M = y correction factors for stability classes D, E, F, and G from Figure 3 in RG 1.145.

A = minimum containment and Auxiliary Building cross-sectional area (m2).

U10

METEOROLOGY 2.3-15 WATTS BAR WBNP-101 Atmospheric dispersion factors (X/Q values) were calculated for a 1-hour averaging period and assumed to apply to the 2-hour period immediately following an accident.

The following equations were used to determine these values:

For stability classes D, E, F, or G and windspeeds less than 6 meters per second (m/s),

the higher value from equations (1) and (2) was compared to the value from equation (3). The lower of these compared values was selected for the X/Q distributions. For wind speeds greater than 6 m/s in these classes and for all wind speeds in stability classes A, B, and C, the higher of the values from equations (1) and (2) was selected.

The minimum cross-sectional area, A, for Watts Bar Nuclear plant is 1630 m2. The exclusion boundary distance is 1200 m, as shown in Figure 2.1-4b. However, to avoid possible nonconservative accident X/Qs, the distance that was used to calculate the X/Qs is 1100 m, which is the minimum distance from the outer edge of the release zone to the exclusion area boundary. The assumed release zone is a 100-m radius circular envelope, which contains all of the structures that are potential sources of accidental releases of airborne radioactive materials. A distance of three miles (4828 m) was used as the low population zone (LPZ) outer boundary distance.

The 1-hour X/Q values for the exclusion boundary distance were distributed in the downwind 22.5-degree compass-point sectors (plume sectors) based on wind direction. Calm wind speeds (less than 0.6 mi/hr) were distributed based on the wind direction frequencies for non-calm wind speeds less than 3.5 mi/hr. The 0.5th and 5th percentile values for each sector and for all sectors combined were identified. For the LPZ distance, the 0.5th percentile and 5th percentile 1-hour values for each sector, the annual average values for each sector, and the 0.5th and 5th percentile 1-hour values for all sectors combined were determined. The annual average X/Qs were calculated from hourly average data according to guidance in Regulatory Guide 1.111 for constant mean wind direction models.[43] All calculations used an assumed wind speed of 0.6 mile per hour (0.268 m/s), which is the starting threshold of the anemometer, for hours with values less than that and thus defined as calms. Site-specific adjustment factors for terrain confinement and recirculation effects on concentrations at the LPZ distance were calculated and applied to the initial annual X Q e

1 U10 SVyVz A 2 e

+





=

(1)

X Q e

1 U10 3SVyVz





=

(2)

X Q e

1 U10S6yVz

=

(3)

2.3-16 METEOROLOGY WATTS BAR WBNP-101 average X/Qs. The method used to develop these adjustment factors is the same as that discussed in the offsite dose calculation manual for Watts Bar Nuclear Plant. The 16 sector adjustment factors are the following:

LPZ distance X/Qs for 8-hour, 16-hour, 3-day, and 26-day averaging periods were obtained by logarithmic interpolation between 1-hour values used for the 2-hour averaging period and annual average values. Sector values were interpolated between the 0.5th percentile 1-hour values assumed for the 2-hour time period and the annual average values for the respective sectors (e.g., between southeast sector 0.5th percentile 2-hour X/Q and southeast sector annual average X/Q). The 5th percentile overall site X/Q values were interpolated between the 5th percentile 1-hour value (assumed for the 2-hour time period) for all sectors combined and the maximum sector annual average value selected from the 16 sector annual average values.

2.3.4.2 Calculation Results The 1-hour sector-specific and overall (all directions combined) atmospheric dispersion factors (X/Q) for the exclusion boundary are presented in Table 2.3-61 based on the 15-year data set of 1974-1988 and Table 2.3.61a based on the 20-year data set of 1974-1993. The maximum 0.5th and 5th percentile X/Q values are from the 15-year data set and are 6.040 x 10-4 sec/m3 and 5.323 x 10-4 sec/m3, respectively.

The maximum 0.5th and 5th percentile X/Q values from the 20-year data sets (6.070 x 10-4 sec/m3 and 5.263 x 10-4 sec m3, respectively) are essentially unchanged from the 15-year values.

The 1-hour 0.5th percentile, 1-hour 5th percentile, and annual average X/Q values for each of the 16 plume sectors and the 1-hour overall 0.5th and 5th percentile X/Q values for the low population zone distance are presented in Table 2.3-62 based on the 15-year data set of 1974-1988 and Table 2.3-62a based on the 20-year set of 1974-1993. Only minor differences exist between the two sets of values.

For 8-hour, 16-hour, 3-day, and 26-day averaging periods, the X/Qs were obtained by logarithmic interpolation between the 1-hour and annual average X/Q values. The 5th percentile overall site 1-hour X/Q and the maximum sector annual average X/Q were used to produce the values given in Table 2.3-63 (1974-1988) and Table 2.3-63a (1974-1993).

The 0.5th percentile 1-hour X/Q and annual average X/Q for each sector were used to produce the values given in Table 2.3-64 (1974-1988) and Table 2.3-65 (1974-1993).

The maximum sector set corresponds to the southeast plume sector. The respective values are:

N NNE NE ENE E

ESE SE SSE 1.36 1.65 2.01 1.61 1.58 1.81 1.28 1.49 S

SSW SW WSW W

WNW NW NNW 1.81 1.77 1.86 1.47 1.00 1.49 1.00 1.00

METEOROLOGY 2.3-17 WATTS BAR WBNP-101 In Section 2.3.3.3, the representativeness of the onsite data summarized in the joint frequency distributions of wind direction and wind speed by atmospheric stability class was discussed. Topographic effects have been mentioned previously, but some expansion relative to the 10-meter wind data is necessary. There is a predominance of northwest wind direction frequencies for a combination of very light wind speeds and quite stable atmospheric stability conditions. The terrain at the site has a general, gradual downward slope toward the south and southeast. Apparently, this is influencing the air flow over the site during periods with very light winds and stable conditions.

Dispersion meteorology used in accident analyses in Chapter 15 include X/Q values in Table 2.3-66 and 1/U values in Table 2.3-67. These values were based on the 15-year data set for 1974-1988. Table 2.3-66a and 2.3-67a present the same information based on the 20-year data set for 1974-1993. The original FSAR values are presented with the updated bases for comparison.

2.3.5 Long-Term (Routine) Diffusion Estimates The X/Qs and D/Qs and the respective calculation methodologies are presented in the Offsite Dose Calculation Manual for Watts Bar Nuclear Plant.

The joint frequency distributions of wind speed and wind direction by stability class in Tables 2.3-45 through 2.3-51 form the basis for Offsite Dose Calculation Manual estimation of long-term X/Qs. RG 1.111 methodology is used to calculate these X/Qs from the onsite meteorological data base. Additional information is provided in the Offsite Dose Calculation Manual.

The long-term representativeness of the 20-year onsite meteorological data base is discussed in Sections 2.3.3.3 and 2.3.4.2.

Period 1974-1988 1974-1993 8-hour 6.765 x 10-5 6.677 x 10-5 16-hour 4.629 x 10-5 4.592 x 10-5 3-day 2.032 x 10-5 2.039 x 10-5 26-day 6.230 x 10-6 6.353 x 10-6

2.3-18 METEOROLOGY WATTS BAR WBNP-101 REFERENCES (1)

U. S. Atomic Energy Commission, A Meteorological Survey of the Oak Ridge Area, Weather Bureau, Publication ORO-99, Oak Ridge, Tennessee, November 1953, page 377.

(2)

Ibid., page 192.

(3)

Dickson, Robert R. Climates of the States - Tennessee, Climatography of the United States No. 60-40, U. S. Department of Commerce., Weather Bureau, February 1960, page 3.

(aa) Nashville NWS web site (http://www.srh.noaa.gov/ohx/?n=tornadodatabase) for Cumberland County [Accessed May 12, 2010].

(bb) Morristown NWS web site (http://www.srh.noaa.gov/mrx/?n=mrx_tornado_db) for Bledsoe, Hamilton, McMinn, Meigs, Rhea, and Roane Counties [Accessed May 12, 2010].

(cc) NUREG/CR-4461 (revision 2), Tornado Climatology of the Contiguous United States, February 2007.

(8)

Thom, H.C.S. "Tornado Probabilities," Monthly Weather Review, October-December 1963, pages 730-736.

(dd) U.S. Department of Commerce. Local Climatological Data, Annual Summary with Comparative Data, 2009, Chattanooga, Tennessee, NOAA, National Climatic Data Center, Asheville, North Carolina.

(ee) U.S. Department of Commerce. Local Climatological Data, Annual Summary with Comparative Data, 2009, Knoxville, Tennessee, NOAA, National Climatic Data Center, Asheville, North Carolina.

(ff)

National Climatic Data Center (NCDC) Storm Event database for 1950-2009 (http://www4.ncdc.noaa.gov/cgi-win/wwcgi.dll?wwEvent~Storms).

(gg) U.S. Department of Commerce. "Climatic Summary of the United States -

Eastern Tennessee," Climatography of the United States No. 10-77, U.S.

Weather Bureau, Revised 1957.

(13) U.S. Department of Commerce. Climatography of the United States No. 20, 1971-2000, Tennessee.

(hh) NUREG/CR-3759, Lightning Strike Density fo Contiguous United States from Thunderstorm Duration Records, May 1984.

(15) Korshover, J. "Climatology of Stagnating Anticyclones East of the Rocky Mountains, 1936-1970," NOAA Technical Memorandum ERL ARL-34, U.S.

Department of Commerce, Air Resources Laboratories, Silver Spring, Maryland, October 1971.

METEOROLOGY 2.3-19 WATTS BAR WBNP-101 (16) Holzworth, G. C. Mixing Heights, Wind Speeds, and Potential for Urban Air Pollution Throughout the Contiguous United States, Environmental Protection Agency, Research Triangle Park, North Carolina, January 1972.

(17) U.S. Department of Commerce/U.S. Department of Agriculture. Weekly Weather and Crop Bulletin, NOAA/USDA Joint Agricultural Weather Facility, Washington, D.C., December 18, 1984, page 14.

(18) Tattelman, Paul, et al. "Estimated Glaze Ice and Wind Loads at the Earth's Surface for the Contiguous United States," Air Force Cambridge Research Laboratories, L. G. Hanscom Field, Massachusetts, October 16, 1973.

(19) American Meteorological Society. "Extremes of Snowfall: United States and Canada," Weatherwise, Vol. 23, December 1970, page 291.

(20) American National Standards Institute, Inc. "American National Standard Building Code Requirements for Minimum Design Loads in Buildings and Other Structures." A58.1-1972, New York, New York, Figure 4, page 27.

(21) Ludlum, David M. Weather Record Book, United States and Canada, Weatherwise, Inc., 1971, page 73.

(ii)

NRC Regulatory Guide-1.76 (revision 1), "Design-Basis Tornado and Tornado Missiles for Nuclear Power Plants, March 2007.

(22) Thom, H. C. S. "New Distributions of Extreme Winds in the United States,"

"Journal of the Structural Division Proceedings of the American Society of Civil Engineers, Paper 6038, July 1968, pages 1787-1801.

(24) Deleted by Amendment 94.

(25) Magnetic tape of Chattanooga, Tennessee, National Weather Service Station data, obtained from the National Climatic Data Center, Asheville, North Carolina. Period of data analyzed, 1965-1971.

(26) U.S. Department of Commerce. Local Climatological Data, Annual Summary with Comparative Data, 2009, Oak Ridge, Tennessee, NOAA, National Climatic Data Center, Asheville, North Carolina.

(27) Hardwick, W. C. "Monthly Fog Frequency in the Continental United States,"

Monthly Weather Review, Volume 101, October 1973, pages 763-766.

(28) Tennessee Valley Authority. Final Safety Analysis Report for Sequoyah Nuclear Plant, Section 2.3, Figure 2.3-5.

(29) Hosler, C. R. "Low-Level Inversion Frequency in the Contiguous United States," Monthly Weather Review, Vol. 89, September 1961, pages 319-339.

2.3-20 METEOROLOGY WATTS BAR WBNP-101 (30) U.S. Department of Commerce. Local Climatological Data, January 1982, Knoxville, Tennessee, NOAA, National Climatic Data Center, Asheville, North Carolina.

(31) U.S. Department of Commerce. Local Climatological Data, January 1982, Chattanooga, Tennessee, NOAA, National Climatic Data Center, Asheville, North Carolina.

(32) U.S. Department of Commerce. Daily Weather Maps, January 18-24, 1982, NOAA, Washington, D.C.

(33) U.S. Department of Commerce. Local Climatological Data, December 1989, Chattanooga, Tennessee, NOAA, National Climatic Data Center, Asheville, North Carolina.

(34) U.S. Department of Commerce. Local Climatological Data, December 1989, Knoxville, Tennessee, NOAA, National Climatic Data Center, Asheville, North Carolina.

(35) U.S. Department of Commerce. Daily Weather Maps, December 25-31, 1989, NOAA, Washington, D.C.

(36) U.S. NuclearRegulatory Commission. Regulatory Guide 1.23, Revision 1, "

Meteorological Monitoring Programs for Nuclear Power Plants," Washington, D.C., March 2007.

(37) Tennessee Valley Authority. "Watts Bar Nuclear Plant Environmental Data Station Manual."

(38) Deleted by Amendment 94.

(39) Deleted by Amendment 94.

(40) U.S. Atomic Energy Commission. Regulatory Guide 1.21, Revision 1, "Measuring, Evaluating, and Reporting Radioactivity in Solid Wastes and Releases of Radioactive Materials in Liquid and Gaseous Effluents from Light-Water-Cooled Nuclear Power Plants," Washington, D.C., June 1974.

(41) U.S. Nuclear Regulatory Commission. Regulatory Guide 1.145, Revision 1, "Atmospheric Dispersion Models for Potential Accident Consequence Assessment at Nuclear Power Plants," Washington, D.C., November 1982.

(42) U.S. Atomic Energy Commission. Regulatory Guide 1.4, Revision 2, "Assumptions Used for Evaluating the Potential Radiological Consequences of a Loss of Coolant Accident for Pressurized Water Reactors," Washington, D.C., June 1974.

METEOROLOGY 2.3-21 WATTS BAR WBNP-101 (43) U.S. Nuclear Regulatory Commission. Regulatory Guide 1.111, Revision 1, "Methods for Estimating Atmospheric Transport and Dispersion of Gaseous Effluents in Routine Releases from Light-Water-Cooled Reactors,"

Washington, D.C., July 1977.

2.3-22 METEOROLOGY WATTS BAR WBNP-101 Table 2.3-1 Thunderstorm Day Frequencies Chattanooga1 1 National Oceanic and Atmospheric Administration, 2009 Local Climatological Data Annual Summary with Comparative Data; Chattanooga, TN (KCHA) -- period of record 62 years.

Knoxville2 2 National Oceanic and Atmospheric Administration, 2009 Local Climatological Data Annual Summary with Comparative Data; Knoxville, TN (KTYS) -- period of record 62 years.

December January February 0.6 1.3 2.0 0.7 0.8 1.4 Winter 3.9 2.9 March April May 3.6 4.8 7.1 3.2 4.5 6.9 Spring 15.5 14.6 June July August 9.0 11.1 8.8 8.5 9.9 6.9 Summer 28.8 25.3 September October November 4.0 1.4 1.5 3.0 1.3 1.1 Autumn 6.9 5.4 Annual 55.1 48.2

METEOROLOGY 2.3-23 WATTS BAR WBNP-101 Table 2.3-1A Extreme Wind Speeds (Page 1 of 2)

This table lists the highest wind speeds observed at Chattanooga NWS, Knoxville NWS, and Watts Bar Nuclear Plant site for different time periods. Because the wind averaging periods varied, all observations were converted to 3-second gusts for comparison (based on ANSI/TIA-222-G, Annex L.a)

Chattanooga, Tennessee (National Weather Service Airport Station)

Period of Record = 1945-2009 (65 years).

Period Data Source (s)

Date of Occurence Observed value (averaging period)

Max 3-sec gust equivalent 1945-1975 Chattanooga (CHA) Local Climatological Data (LCD),

1975 Annual and CHA LCD, March 1947.b March 24, 1947 82 mph (fastest mile) 102 mph 1976-1995 CHA LCD, 1995 Annual and CHA LCD, November 1995.b November 11, 1995.

38 mph (2-min average) 47 mph (5-sec average) 48 mph 1996-2009 CHA LCD, 2009 Annual and CHA LCD, June 2009.b June 11, 2009 63 mph (3 second gust) 63 mph Maximum wind speed (3-second gust equivalent) = 102 mph on March 24, 1947.

Knoxville, Tennessee (National Weather Service Airport Stations)

Period of Record = 1943-2009 (67 years).

Period Data Source (s)

Date of Occurence Observed value (averaging period)

Max 3-sec gust equivalent 1943-1974 Knoxville (TYS) LCD, 1974 Annual and TYS LCD, July 1961.b July 15, 1961 73 mph (fastest mile) 88 mph 1975-1995 TYS LCD, 1995 Annual and TYS LCD, November 1995.b November 11, 1995.

45 mph (2-min average) 54 mph (5-sec average) 56 mph 1996-2009 TYS LCD, 2009 Annual and TYS LCD, June 2009.b April 20, 1996 76 mph (3 second gust) 76 mph Maximum wind speed (3-second gust equivalent) = 88 mph on July 15, 1961.

2.3-24 METEOROLOGY WATTS BAR WBNP-101 Watts Bar Meteorological Tower Period of Record = 1973-2009 (37 years).

Period Data Source (s)

Date of Occurence Observed value (averaging period)

Max 3-sec gust equivalent 1973-2009 TVA wind observations for 10- and 91-meter wind sensors Mar 25, 1975 39 mph (hourly average) 5 mph Maximum wind speed (3-second gust equivalent) = 59 mph on March 25, 1975.

a. ANSI/TIA-222-G, Structural Standard for Antenna Supporting Structures and Antennas", effective January 1, 2006.

The relevant portion of Annex L, "Wind Speed Conversions" is provided below:

Fastest Mile 10-min average (mph) 3-sec gust (mph)

Wind Speed (mph)

Averaging Period (sec)

Hourly mean (mph) 60 70 80 85 90 95 100 105 50 58 66 70 75 78 80 85 72 62 55 51 48 46 45 42 42 49 56 59 62 66 69 73 40 46 53 56 60 63 66 70 Intermediate values are determined by interpolation.

b.

Annual and Monthly Local Climatological Data reports (for applicable cities and time periods) from the NOAA National Climatic Data Center, Asheville, North Carolina.

Table 2.3-1A Extreme Wind Speeds (Page 2 of 2)

METEOROLOGY 2.3-25 WATTS BAR WBNP-101 Table 2.3-1B Storm Events for Rhea and Surronding Counties (Page 1 of 2)

These tables list the storm events for Rhea and surrounding counties from the National Climatic Data Center (NCDC) Storm Event database for 1950-2009 (http://www4.ncdc.noaa.gov/cgi-win/wwcgi.dll?wwEvent~Storms). Accessed August 20, 2010.

Listed counties are adjacent to Rhea county and/or have potions of the county within 10 miles of Watts Bar Nuclear Plant. Number of occurrences is for the entire county.

High winds:

Search Settings (except county):

Begin Date = 01/01/1950 End Date = 12/31/2009 Event type = All High Wind Speed of at Least 50 Knots All other search settings default.

County Total Number of Occurrences Average Occurrences per Year

• Rhea (including Watts Bar)

Bledsoe Cumberland Hamilton McMinn Meigs Roane 122 103 91 275 163 82 144 2.03 1.72 1.52 4.58 2.72 1.36 2.40 TOTAL EVENTS 980 16.33

2.3-26 METEOROLOGY WATTS BAR WBNP-101 Large Hail:

Search Settings (except county):

Begin Date = 01/01/1950 End Date = 12/31/2009 Event type = Hail Hail, Size of at Least 0.75 Inches All other search settings default.

County Total Number of Occurrences Average Occurrences per Year

• Rhea (including Watts Bar)

Bledsoe Cumberland Hamilton McMinn Meigs Roane 122 103 91 275 163 82 144 2.03 1.72 1.52 4.58 2.72 1.36 2.40 TOTAL EVENTS 980 16.33

• Total Number of Occurrences/60 years Table 2.3-1B Storm Events for Rhea and Surronding Counties (Page 2 of 2)

METEOROLOGY 2.3-27 WATTS BAR WBNP-101

a. Cooperative Observer Stations

[Dayton, Tennessee] Climatography of the United States No. 20 1971-2000 (Station -

Dayton 2 SE, TN; COOP ID = 402360), National Climate Data Center, Ashville, NC.

[Decatur, Tennessee] Climatography of the United States No. 10-77, "Climatic Summary of the United States - Eastern Tennessee," U.S. Department of Commerce, Weather Bureau, revised 1957 and Annual NCDC Tennessee Climatological Data for individual years during 1896-1956.

b. Period of Record:

Dayton = 1971-2000 (30 years).

Decatur = 1896-1930 (35 years)

c. Period of Record:

Dayton = 1956-2001 (46 years).

Decatur = 1896-1945, 1952-1956 (60 years).

d. July 16, 1980.

e. July 28, 1930 and July 29, 1952.

f. January 21, 1985

g. Date unknown. According to Climatography of the United States No. 10-77, Decatur reported a low temperature of -20°F during 1896-1930. However, the specific date cannot be identified in the Annual NCDC Tennessee Climatological Data reports for the period. Coldest temperature for a known date was -19°F on January 26, 1940.

Table 2.3-2 Temperature Data Dayton and Decatur, Tennessee Coopertive Observer Data (Data in °F)

Daily Averageb Average Daily Maximumb Average Daily Minimumb Extreme Maximumc Extreme Minimumc Month Dayton Decatur Dayton Decatur Dayton Decatur Dayton Decatur Dayton Decatur Jan 36.2 40.0 45.9 50.6 26.5 29.4 75 76

-15f

-9 Feb 40.5 41.6 51.6 53.0 29.3 30.3 79 78

-4

-20g Mar 48.8 50.5 60.8 63.0 36.7 38.1 85 91 3

2 Apr 57.4 58.5 70.3 72.0 44.4 45.0 92 94 22 20 May 65.4 67.1 77.3 80.8 53.5 53.5 94 99 30 30 Jun 73.3 74.6 84.7 87.2 61.8 62.0 100 103 40 40 Jul 76.9 77.6 87.7 89.8 66.1 65.3 107d 108e 49 48 Aug 76.0 76.9 86.9 89.3 65.0 64.5 104 107 49 49 Sep 70.1 71.9 81.0 85.1 59.1 58.7 100 106 30 34 Oct 58.3 60.0 70.4 74.1 46.1 45.9 90 96 23 19 Nov 48.1 48.4 58.8 61.3 37.3 35.5 83 82 9

7 Dec 39.3 40.3 49.0 50.8 29.6 29.9 76 76

-5

-4 Annual 57.5 59.0 68.7 71.4 46.3 46.5 107d 108e

-15f

-20g

2.3-28 METEOROLOGY WATTS BAR WBNP-101

a. National Oceanic and Atmospheric Administration, 2009 Local Climatological Data Annual Summary with Comparative Data; Chattanooga, TN (KCHA).

b. Period of Record = 1971-2000 (30 years).

c. Period of Record = 1928-2009 (82 Years).

d. Period of Record = 1940-2009 (70 Years).

e. January 1985.

f. July 1952.

Table 2.3-3 Temperature Data Chattanooga, Tennessee National Weather Servicea (Data in °F)

Month Normal Dry Bulba Mean Daily Maximumc Mean Daily Minimumc Extreme Maximumd Extreme Minimumd January 39.4 49.9 31.1 78

-10d February 43.4 52.8 32.5 79 1

March 51.4 62.3 40.0 89 8

April 59.6 71.7 47.8 93 25 May 67.7 80.0 56.7 99 34 June 75.4 86.3 64.4 104 41 July 79.6 89.6 69.0 106e 51 August 78.5 89.0 68.2 105 50 September 72.1 82.6 61.2 102 36 October 60.4 73 49.2 94 22 November 50.3 60.6 38.8 84 4

December 42.4 51.8 32.8 78

-2 Annual 60.0 70.8 49.3 106e

-10d

METEOROLOGY 2.3-29 WATTS BAR WBNP-101 WBN =

Watts Bar Nuclear Plant Meteorological tower. The meteorological facility is located 0.8 km south-southwest of Watts Bar Nuclear Plant. The rain gauge is 1 meter above ground.

Dam =

TVA rain gauge station 421 at Watts Bar Dam. The Dam is located 1.9 km north of Watts Bar Nuclear Plant. The rain gauge is located on the roof of the Control Building at Watts Bar Dam.

• • Annual totals do not equal the sum of monthly values due to rounding.

a. Period of record = 1974-2008 for Watts Bar Nuclear Plant and 1940-1975 for Watts Bar Dam.

b. Period of record = 1974-2008 for Watts Bar Nuclear Plant and 1941-1970 for Watts Bar Dam.

c. Period of record = 1974-2008 for Watts Bar Nuclear Plant and September 1939-September 1989 for Watts Bar Dam.

d. January 1946.

e. March 1975.

f.

September 1957.

g. September 17, 1994.

Table 2.3-4 Precipitation Data Watts Bar Nuclear Plant and Watts Bar Dam Precipitation Data (Inches)

(Data in Inches)

Average No.

of Days 0.01 Inch or Morea Averageb Extreme Maximumc Extreme Minimumc 24-hour Maximumc Month WBN*

Dam*

WBN Dam WBN Dam WBN Dam WBN Dam Jan 11 11 4.39 5.30 9.89 11.67 0.80 0.93 3.31 5.31d Feb 10 10 4.12 5.34 12.28 9.79 0.37 0.74 3.56 3.50 Mar 11 11 4.50 5.62 12.33e 11.75 1.43 1.32 3.49 5.00 Apr 9

10 3.52 4.56 8.72 8.66 0.41 0.80 3.69 3.10 May 10 9

4.00 3.57 11.94 10.94 0.73 0.56 4.26 3.20 Jun 9

9 3.42 3.81 10.29 12.30 0.13 0.03 4.44 3.73 Jul 10 10 3.86 5.14 11.41 12.50 0.25 0.50 3.70 4.80 Aug 8

9 2.96 3.20 7.91 7.13 0.02 0.52 3.61 3.19 Sep 7

7 3.45 3.69 8.55 14.78f 0.46 0.45 4.77g 4.50 Oct 7

6 2.59 2.90 6.52 7.91 0.00 0.00 3.09 3.05 Nov 9

8 4.30 4.13 8.85 14.06 0.73 0.94 2.64 4.63 Dec 11 10 4.31 5.31 11.92 12.08 1.32 0.30 4.72 4.15 Annual 111 110 45.43 52.57

2.3-30 METEOROLOGY WATTS BAR WBNP-101

a. Climatography of the United States, No. 20, 1971-2000 (COOP ID = 402360).

b. Derived from Snow Climatology and 1971-2000 daily data.

c. Derived from 1971-2000 daily data.

d. February 1979

e. March 13, 1993.

Table 2.3-5 Snowfall Data (Inches)

Dayton, Tennessee (Data in Inches)

Month Averagea,b Maximum Monthlya,c Highest Dailya,c January 1.8 9.7 7.2 February 1.6 13.3d 7.5 March 0.8 8.0 8.0e April 0.1 2.7 2.7 May 0

0 0

June 0

0 0

July 0

0 0

August 0

0 0

September 0

0 0

October 0

0 0

November Trace Trace Trace December 0.1 1.1 1.0 Annual 4.4

METEOROLOGY 2.3-31 WATTS BAR WBNP-101

• Value is between 0.00 and 0.05.

a. Local Climatological Data, Annual Summary with Comparative Data, 1983 and 2009, Chattanooga, Tennessee, U.S. Department of Commerce, NOAA, NCDC, Asheville, N.C.

b. Local Climatological Data, Annual Summary with Comparative Data, 1983 and 2009, Knoxville, Tennessee, U.S. Department of Commerce, NOAA, NCDC, Asheville, N.C.

c. Period of record for monthly normal is 30 years (1971-2000).

d. Period of record for maximum monthly and maximum 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> events is 72 years for Chattanooga and 65 years for Knoxville.

For Chattanooga, the maximum monthly and maximum 24-hour event was 20.0 inches during March 1993.

For Knoxville, the maximum monthly event was 23.3 inches during February 1960 and the maximum 24-hour event was 18.2 inches during November 1952.

e. Another site had the highest maximum monthly event for the Knoxville locality -- 25.7 inches in February 1895.

Table 2.3-6 Snowfall Data Chattanooga and Knoxville, Tennessee NWS (Data in Inches)

Normalc Maximum Monthlyd Maximum in 24 Hrs.d Month Chattanooga Knoxville Chattanooga Knoxville Chattanooga Knoxville January 2.0 3.7 10.2 15.1 10.2 12.0 February 1.3 3.0 10.4 23.3 8.7 17.5 March 1.2 1.6 20.0 20.2 20.0 14.1 April 0.2 0.8 2.8 10.7 2.8 10.7 May 0

0 trace trace trace trace June 0

0 trace trace trace trace July 0

0 0

0 0

0 August 0

0 0

trace 0

trace September 0

0 trace trace trace trace October trace trace trace trace November 0.1 2.8 18.2 2.8 18.2 December 0.1 0.7 9.1 12.2 8.9 8.9 Annual 4.8 9.9 20.0 23.3e 20.0 18.2

2.3-32 METEOROLOGY WATTS BAR WBNP-101

1. Local Climatological Data, Annual Summary with Comparative Data, 1983 and 2009, Chattanooga, Tennessee, U.S. Department of Commerce, NOAA, NCDC, Asheville, N.C.

(Period of Record = 1971-2000).

2. Local Climatological Data, Annual Summary with Comparative Data, 1974, Chattanooga, Tennessee, U.S. Department of Commerce, NOAA, NCDC, Asheville, N.C. (Period of Record =

1941-1974 for hour 0100 and 1931-1974 for hours 0700, 1300, and 1900).

Table 2.3-7 Average Relative Humidity Data (Percent) - Selected Hours Chattanooga, Tennessee*

(Eastern Standard Time)

Updated Data (1971-2000)1 Original Date (1931/41-1974)2 Month Hour 0100 Hour 0700 Hour 1300 Hour 1900 Hour 0100 Hour 0700 Hour 1300 Hour 1900 January 79 81 63 66 80 82 63 68 February 77 82 58 58 78 80 57 60 March 76 82 55 53 77 81 53 56 April 78 85 49 49 78 81 49 52 May 87 89 55 58 86 85 51 56 June 87 90 57 60 88 85 54 60 July 87 90 57 62 89 89 57 64 August 88 92 58 64 90 91 57 66 September 89 92 59 66 89 90 55 66 October 88 91 55 68 88 89 52 67 November 83 86 59 68 82 84 55 65 December 80 83 62 68 82 83 62 70 Annual 83 87 57 62 84 85 55 63

METEOROLOGY 2.3-33 WATTS BAR WBNP-101 Analysis based on data tapes obtained from National Climatic Data Center, Asheville, North Carolina. Observations recorded on tape are for 3-hourly synoptic times.

Table 2.3-8 Relative Humidity (Percent)

National Weather Service Station Chattanooga, Tennessee*

January 1965-December 1971 Month Average Avg. Max.

Avg. Min.

Extreme Max.

Extreme Min.

December 75.3 83.6 67.7 100.0 10.7 January 72.3 74.6 69.5 100.0 18.6 February 67.0 76.8 58.0 100.0 12.1 Winter 71.5 78.3 65.1 100.0 10.7 March 64.1 71.4 55.0 100.0 13.8 April 64.6 72.3 56.9 100.0 12.8 May 71.1 77.1 65.0 100.0 19.0 Spring 66.6 73.6 58.9 100.0 12.8 June 72.3 77.4 68.3 100.0 23.1 July 75.5 80.1 71.2 100.0 26.9 August 78.4 82.9 75.3 100.0 32.5 Summer 75.4 80.1 71.6 100.0 23.1 September 79.7 84.0 75.2 100.0 26.0 October 76.6 83.0 71.1 100.0 18.2 November 72.6 79.7 66.2 100.0 16.1 Fall 76.3 82.2 70.8 100.0 16.1 Annual 72.5 78.6 66.6 100.0 10.7

2.3-34 METEOROLOGY WATTS BAR WBNP-101 Analysis based on data tapes obtained from National Climatic Data Center, Asheville, North Carolina. Observations recorded on tape are for 3-hourly synoptic times.

Absolute Humidity Chattanooga, Tennessee NWS (Data in gm/m3)

January 1965-December 1971*

Month Average Avg. Max.

Avg. Min.

Extreme Max.

Extreme Min.

December 5.8 7.2 4.5 16.1 0.9 January 4.8 5.3 4.5 14.0 0.4 February 4.5 5.8 3.4 14.1 0.8 Winter 5.0 6.1 4.1 16.1 0.4 March 5.9 7.2 4.6 16.6 1.1 April 8.6 10.3 7.0 20.1 2.4 May 11.4 12.8 9.9 19.6 3.4 Spring 8.6 10.1 7.1 20.1 1.1 June 14.7 15.9 13.5 22.7 4.9 July 16.7 17.7 15.6 24.2 8.6 August 17.0 18.2 16.0 25.8 9.6 Summer 16.1 17.3 15.0 25.8 4.9 September 14.8 16.2 13.6 23.6 4.2 October 10.0 11.6 8.5 20.8 3.0 November 6.5 7.9 5.1 17.8 1.2 Fall 10.4 11.9 9.1 23.6 1.2 Annual 10.0 11.4 8.8 25.8 0.4

METEOROLOGY 2.3-35 WATTS BAR WBNP-101 Data were collected at the Watts Bar Meteorological tower located 0.8 km SSW of Watts Bar Nuclear Plant. Temperature and dewpoint instruments at 4 feet above ground.

Relative Humidity Watts Bar Nuclear Plant Meteorological Facility (Sheet 1 of 2)

(Data in Percent)

July 1, 1973 - June 30, 1975

• Month Average Average Maximum Average Minimum Extreme Maximum Extreme Minimum December 71.2 85.1 53.8 100.0 30.2 January 73.6 87.5 54.5 100.0 10.4 February 70.3 87.5 50.9 100.0 21.4 Winter 71.7 86.7 53.1 100.0 10.4 March 69.9 88.4 49.8 100.0 22.6 April 64.5 87.8 38.6 100.0 11.2 May 78.3 94.1 56.9 100.0 28.3 Spring 70.9 90.1 48.5 100.0 11.2 June 75.2 91.6 55.0 100.0 34.6 July 76.2 93.4 48.4 100.0 10.1 August 78.7 93.6 55.1 100.0 36.7 Summer 76.7 92.9 52.9 100.0 10.1 September 77.9 91.8 56.8 100.0 29.3 October 71.5 89.9 43.2 100.0 19.7 November 69.0 87.0 47.4 96.5 26.9 Fall 72.8 89.6 49.1 100.0 19.7 Annual 73.0

2.3-36 METEOROLOGY WATTS BAR WBNP-101 Data were collected at the Watts Bar Meteorological tower located 0.8 km SSW of Watts Bar Nuclear Plant. Temperature and dewpoint instruments are 10 meters (33 feet) above ground.

Relative Humidity (RH) is calculated from simultaneous 10-m temperature (T) and 10-m dewpoint (Td) using equations from El Paso NWS website (http://www.srh.noaa.gov/epz/?n=wxcalc).

units:

RH = percent (%)

T, Td = degrees celsius (°C) e, es = millibars (mb)

Table 2.3-10 Relative Humidity Watts Bar Nuclear Plant Meteorological Facility (Sheet 2 of 2)

(Data in Percent)

January 1, 1976 - December 31, 2008

• Month Average Average Maximum Average Minimum Extreme Maximum Extreme Minimum December 71.2 89.7 52.7 100.0 18.1 January 68.7 87.6 51.1 100.0 14.3 February 66.0 87.8 46.5 100.0 11.6 Winter 68.6 88.4 50.1 100.0 11.6 March 64.0 88.3 43.0 100.0 10.4 April 64.5 91.2 42.1 100.0 11.2 May 72.5 95.5 50.5 100.0 18.3 Spring 67.0 91.7 45.2 100.0 10.4 June 75.0 95.9 53.1 100.0 20.0 July 76.8 95.9 55.1 100.0 19.6 August 76.4 95.6 54.0 100.0 25.6 Summer 76.1 95.8 54.1 100.0 19.6 September 75.9 94.7 53.2 100.0 18.8 October 73.5 94.4 49.9 100.0 15.5 November 71.3 91.7 50.3 100.0 12.0 Autumn 73.6 93.6 51.1 100.0 12.0 Annual 71.3 RH e

es

©

¹

§

• *100 where: e 6.11* 10 7.5*Td 237.6 Td

+

©

¹

§

=

=

es 6.11* 10 7.5*Td 237.6 T

+

©

¹

§

=

METEOROLOGY 2.3-37 WATTS BAR WBNP-101 Data were collected at the Watts Bar Meteorological tower located 0.8 km SSW of Watts Bar Nuclear Plant. Temperature and dewpoint instruments at 4 feet above ground.

Table 2.3-11 Absolute Humidity Watts Bar Nuclear Plant Meteorological Facility (Sheet 1 of 2)

(Data in gm/m3)

July 1, 1973 - June 30, 1975

• Month Average Average Maximum Average Minimum Extreme Maximum Extreme Minimum December 5.2 6.6 4.0 14.5 1.5 January 6.1 7.8 4.3 13.2 1.0 February 5.7 7.3 4.3 15.1 1.5 Winter 5.7 7.2 4.2 15.1 1.0 March 7.1 8.9 5.3 14.7 1.8 April 8.3 10.3 6.4 17.7 2.0 May 13.7 15.9 11.6 21.5 4.9 Spring 9.7 11.7 7.8 21.5 1.8 June 14.7 17.2 12.4 22.1 7.8 July 17.1 19.3 13.7 22.7 1.8 August 16.7 18.9 14.9 24.4 10.1 Summer 16.2 18.4 13.7 24.4 1.8 September 14.4 16.5 12.5 21.9 4.9 October 9.2 11.0 7.7 17.7 3.1 November 7.0 8.7 5.4 16.6 2.1 Fall 10.2 12.1 8.5 21.9 2.1 Annual 10.4

2.3-38 METEOROLOGY WATTS BAR WBNP-101

• Data were collected at the Watts Bar Meteorological tower located 0.8 km SSW of Watts Bar Nuclear Plant. Temperature and dewpoint instruments are 10 meters (33 feet) above ground.

Absolute Humidity (AH) is calculated from simultaneous 10-m temperature (T) and 10-m vapor pressure (Pw = e from Table 2.3-10) using equation from User's Guide - Vaisala HUMICAP Humidity and Temperature Transmitter Series HMT330.

units: AH = grams/cubic meter (g/m3)

T = degrees kelvin (°K)

Pw = millibars (mb)

Absolute Humidity Watts Bar Nuclear Plant Meteorological Facility (Sheet 2 of 2)

(Data in gm/m3)

January 1, 1976 - December 31, 2008

• Month Average Average Maximum Average Minimum Extreme Maximum Extreme Minimum December 5.1 6.5 4.2 16.5 0.5 January 4.4 5.7 3.6 14.7 0.4 February 4.7 6.1 3.9 14.2 0.6 Winter 4.8 6.1 3.9 16.5 0.4 March 6.1 7.8 5.0 17.6 0.8 April 8.3 10.3 6.8 18.8 1.6 May 11.9 14.0 10.4 24.0 3.1 Spring 8.8 10.7 7.4 24.0 0.8 June 15.4 17.5 13.6 24.8 5.3 July 17.5 19.5 15.6 27.1 7.1 August 16.9 19.0 15.1 27.6 7.2 Summer 16.6 18.7 14.8 27.6 5.3 September 14.0 16.0 12.3 21.9 3.8 October 9.7 11.5 8.3 21.9 1.7 November 6.9 8.4 5.7 19.0 1.2 Autumn 10.2 11.9 8.7 21.2 1.2 Annual 10.1 AH = 216.68

• Pw T

©

¹

§

METEOROLOGY 2.3-39 WATTS BAR WBNP-101 Mean number of days with heavy fog, which is defined by horizontal visibility 1/4 mile or less.

a.

Local Climatological Data, Annual Summary with Comparative Data, 2009, Chattanooga, Tennessee, U.S. Department of Commerce, NOAA, NCDC, Asheville, North Carolina. Period of record = 46 years.

b.

Local Climatological Data, Annual Summary with Comparative Data, 2009, Knoxville, Tennessee, U.S.

Department of Commerce, NOAA, NCDC, Asheville, North Carolina. Period of record = 46 years.

c.

Local Climatological Data, Annual Summary with Comparative Data, 2009, Oak Ridge, Tennessee, U.S. Department of Commerce, NOAA, NCDC, Asheville, North Carolina. Period of record = 10 years.

d.

Hardwick, W. C. "Monthly Fog Frequency in the Continental United States", Monthly Weather Review, Volume 101, October 1973, pages 763-766.

Table 2.3-12 Fog Data*

Month Chat.a Knox.b Oak R.c Est. from Hardwickd January 2.8 2.6 2.5 1

February 1.5 1.8 1.3 2

March 1.2 1.7 1.8 1

April 1.3 1.3 1.7 1

May 2.2 2.2 5.5 2

June 1.6 1.8 4.8 2

July 1.5 2.1 5.8 2

August 1.9 3.5 5.2 3

September 3.3 3.8 7.5 4

October 4.8 4.3 7.8 6

November 3.3 2.9 4.5 4

December 2.4 2.4 4.3 3

Annual 27.8 30.4 52.7 33

2.3-40 METEOROLOGY WATTS BAR WBNP-101 TOTAL HOURS OF VALID W IND OBSERVATIONS169102 TOTAL HOURS OF OBSERVATIONS175320 RECOVERABILITY PERCENTAGE96.5 TOTAL HOURS CALM4990 METEOROLOGICAL FACILITY: W ATTS BAR NUCLEAR PLANT W IND SPEED AND DIRECTION M EASURED AT 9.72 M ETER LEVEL M EAN W IND SPEED = 4.07Date Printed: 29-NOV-94 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUM BERS Table 2.3-13 Joint Percentage Frequencies of Wind Speed By Wind Direction Disregarding Stability Class Watts Bar Nuclear Plant Jan 1, 1974 - Dec 31, 1993 WIND DIRECTION 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 N

0.125 0.707 1.399 1.677 1.445 1.578 0.074 0.000 0.000 7.004 NNE 0.124 0.615 1.407 2.043 1.956 2.127 0.112 0.000 0.000 8.446 NE 0.160 0.728 1.957 1.783 1.051 0.695 0.011 0.001 0.000 6.386 ENE 0.242 1.112 2.944 1.296 0.425 0.150 0.002 0.000 0.000 6.170 E

0.151 0.992 1.540 0.583 0.138 0.045 0.002 0.000 0.000 3.451 ESE 0.059 0.438 0.546 0.192 0.028 0.013 0.001 0.000 0.000 1.277 SE 0.086 0.609 0.834 0.319 0.076 0.048 0.014 0.000 0.000 1.985 SSE 0.145 0.892 1.540 0.598 0.176 0.141 0.037 0.003 0.000 3.532 S

0.222 1.106 2.621 1.844 0.869 0.732 0.204 0.021 0.001 7.620 SSW 0.281 1.209 3.504 4.017 3.001 3.115 0.611 0.048 0.000 15.786 SW 0.237 1.479 2.506 1.516 0.756 0.470 0.072 0.004 0.001 7.040 WSW 0.239 1.888 2.135 0.666 0.372 0.317 0.082 0.004 0.000 5.702 W

0.235 2.104 1.843 0.646 0.546 0.653 0.090 0.008 0.002 6.127 WNW 0.212 2.052 1.505 0.637 0.597 0.821 0.086 0.005 0.000 5.915 NW 0.266 2.455 2.061 0.765 0.722 1.026 0.102 0.002 0.000 7.354 NNW 0.168 1.354 1.463 0.975 0.921 1.242 0.082 0.001 0.000 6.205 SUBTOTAL 2.951 19.738 29.823 19.554 13.081 13.172 1.583 0.095 0.003 100.00

METEOROLOGY 2.3-41 WATTS BAR WBNP-101 Table 2.3-14 Joint Percentage Frequencies Of Wind Speed By Wind Direction Disregarding Stability Class, Watts Bar Nuclear Plant Jan 1, 74 - Dec 31, 93 Wind Direction

( 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 N

NNE NE ENE E

ESE SE SSE S

SSW SW WSW W

WNW NW NNW Subtotal 0.109 0.189 0.272 0.215 0.109 0.056 0.061 0.112 0.191 0.237 0.140 0.085 0.068 0.056 0.062 0.065 2.026 0.561 0.809 1.144 1.013 0.774 0.418 0.387 0.574 0.765 0.745 0.584 0.448 0.428 0.390 0.388 0.387 9.813 1.284 2.381 3.460 2.622 1.061 0.526 0.642 1.313 2.456 3.261 1.787 0.981 0.721 0.549 0.661 0.710 24.413 1.176 2.260 2.490 1.257 0.488 0.279 0.334 0.671 1.791 4.368 2.080 0.747 0.428 0.416 0.486 0.622 19.894 1.327 2.104 1.633 0.579 0.195 0.059 0.103 0.217 0.887 3.484 1.732 0.514 0.396 0.450 0.650 0.714 15.143 2.822 2.940 1.555 0.393 0.087 0.026 0.093 0.240 0.875 4.555 2.366 0.764 0.859 1.243 1.398 1.554 21.770 0.419 0.437 0.126 0.024 0.008 0.002 0.024 0.097 0.314 1.901 0.714 0.294 0.327 0.438 0.391 0.457 6.045 0.019 0.008 0.002 0.000 0.000 0.001 0.008 0.018 0.093 0.355 0.103 0.073 0.049 0.031 0.027 0.021 0.808 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.013 0.032 0.015 0.017 0.007 0.001 0.001 0.001 0.087 7.788 11.128 10.682 6.203 2.722 1.367 1.652 3.242 7.386 18.939 9.521 3.922 3.282 3.573 4.065 4.530 100.000 Total Hours Of Valid Wind Observations 142902 Total Hours Of Observations 149016 Recoverability Percentage Total Hours Calm 95.9 2895 Meteorological Facility: Watts Bar Nuclear Plant Wind Speed And Direction Measured At 46.36 Meter Level Mean Wind Speed = 5.6981 Date Printed: 29-NOV-94 Note: Totals And Subtotals Are Obtained From Unrounded Numbers

METEOROLOGY 2.3-42 WATTS BAR WBNP-101 Table 2.3-15 Wind Direction Persistence Data Disregarding Stability, Watts Bar Nuclear Plant Jan 1, 74 - Dec 31, 93 (Sheet 1 of 2)

Wind Direction ACC.

ACC.

N NNE NE ENE E

ESE SE SSE S

SSW SW WSW W

WNW NW NNW CALM TOTAL TOTAL FREQUENCY 2

3 4

5 6

7 8

9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32

>32 TOTAL 860 360 241 159 112 74 75 36 29 25 15 14 5

5 4

4 3

3 4

1 1

1 0

1 0

0 0

0 0

0 0

0 2032 887 465 298 169 160 93 78 42 54 30 19 16 13 14 8

9 6

8 6

5 7

0 5

0 1

0 0

0 0

0 0

3 2396 906 388 253 146 89 70 39 20 14 9

3 4

4 0

3 1

2 0

0 0

0 0

0 0

1 0

0 0

0 0

0 0

1952 938 428 220 122 64 37 20 11 12 4

1 2

0 1

1 0

0 0

0 0

0 0

0 0

0 0

0 0

0 0

0 0

1861 487 201 71 30 18 7

2 0

0 0

0 0

0 0

1 0

0 0

0 0

0 0

0 0

0 0

0 0

0 0

0 0

817 134 44 9

1 0

0 0

0 0

0 0

0 0

0 0

0 0

0 0

0 0

0 0

0 0

0 0

0 0

0 0

0 188 208 77 27 11 5

3 0

0 0

0 3

0 0

0 0

0 0

0 0

0 0

0 0

0 0

0 0

0 0

0 0

0 334 462 196 77 30 21 4

5 2

2 0

1 0

0 0

0 0

1 0

0 0

0 0

0 0

0 0

0 0

0 0

0 0

801 1085 496 275 174 102 50 29 18 14 13 11 3

2 2

0 1

0 0

0 0

0 1

0 1

0 0

0 0

0 0

0 0

2277 1242 697 531 417 289 269 187 139 123 99 79 62 49 42 21 20 22 19 10 2

6 6

3 3

6 3

3 0

4 0

2 7

4362 1030 392 219 130 46 38 26 17 8

5 1

2 3

3 0

1 1

0 0

1 0

0 0

0 0

0 0

0 0

0 0

0 1923 782 328 132 67 42 20 20 5

6 4

0 2

0 1

1 0

1 0

0 0

0 0

0 0

0 0

0 0

0 0

0 0

1411 879 353 182 114 61 20 34 9

9 6

3 2

1 1

1 0

0 1

0 0

0 0

0 0

0 0

0 0

0 0

0 0

1676 783 328 179 127 68 34 18 17 8

12 2

2 2

0 1

0 0

1 0

0 0

0 0

0 0

0 0

0 0

0 0

0 1582 988 481 255 162 99 63 56 22 12 11 2

4 0

1 2

1 1

2 0

1 0

1 0

0 2

1 0

0 0

0 0

0 2167 802 373 212 114 81 52 25 30 13 11 7

6 3

6 2

2 0

1 0

3 0

1 1

1 0

0 1

0 0

0 0

0 1747 344 186 113 72 61 45 29 23 20 9

4 5

6 2

0 0

0 0

0 0

0 0

0 0

0 0

0 0

0 0

0 0

919 12817 5793 3294 2045 1318 879 643 391 324 238 151 124 88 78 45 39 37 35 20 13 14 10 9

6 10 4

4 0

4 0

2 10 28445 28445 15628 9835 6541 4496 3178 2299 1656 1265 941 703 552 428 340 262 217 178 141 106 86 73 59 49 40 34 24 20 16 16 12 12 10 100.00 54.94 34.58 23.00 15.81 11.17 8.08 5.82 4.45 3.31 2.47 1.94 1.50 1.20 0.92 0.76 0.63 0.50 0.37 0.30 0.26 0.21 0.17 0.14 0.12 0.08 0.07 0.06 0.06 0.04 0.04 0.04

METEOROLOGY 2.3-43 WATTS BAR WBNP-101 Meteorological Facility: Watts Bar Nuclear Plant Wind Speed And Direction Measured At The 9.72 Meter Level Maximum Persistence (Hours) 25 40 26 16 16 5

12 18 25 44 21 18 19 19 27 28 15 50.0%

80.0%

90.0%

99.0%

99.9%

3 6

8 16 22 3

6 9

20 37 3

5 6

11 18 2

4 5

10 15 2

3 4

7 16 2

3 3

4 5

2 3

4 7

12 2

3 4

8 18 3

4 6

11 17 4

8 11 21 34 2

4 5

10 18 2

4 5

10 16 2

4 5

10 16 3

4 6

11 16 3

5 6

11 26 3

5 6

15 25 3

6 8

13 15 Table 2.3-15 Wind Direction Persistence Data Disregarding Stability, Watts Bar Nuclear Plant Jan 1, 74 - Dec 31, 93 (Sheet 2 of 2)

Wind Direction ACC.

ACC.

N NNE NE ENE E

ESE SE SSE S

SSW SW WSW W

WNW NW NNW CALM TOTAL TOTAL FREQUENCY

METEOROLOGY 2.3-44 WATTS BAR WBNP-101 Table 2.3-16 Wind Direction Persistence Data Disregarding Stability, Watts Bar Nuclear Plant Jan 1, 77 - Dec 31, 93 (Sheet 1 of 2)

Persistence Wind Direction ACC.

ACC.

(Hours)

N NNE NE ENE E

ESE SE SSE S

SSW SW WSW W

WNW NW NNW CALM TOTAL TOTAL FREQUENCY 2

3 4

5 6

7 8

9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 772 348 227 168 122 77 54 47 27 20 20 11 18 10 5

4 2

3 0

1 2

1 0

0 0

1 1

0 1014 503 360 182 165 128 73 59 46 36 36 23 15 23 16 7

9 8

7 5

6 3

1 3

0 2

0 1

1137 539 403 275 169 122 70 57 35 18 31 14 10 10 4

2 3

1 1

2 1

0 0

0 2

2 0

0 822 353 200 98 59 31 18 7

8 4

1 1

0 0

0 0

0 0

0 0

0 0

0 0

0 0

0 0

323 102 45 12 4

3 2

0 0

0 0

0 0

0 0

0 0

0 0

0 0

0 0

0 0

0 0

0 145 32 16 4

0 0

0 0

0 0

0 0

0 0

0 0

0 0

0 0

0 0

0 0

0 0

0 0

174 60 19 11 7

0 1

2 0

0 0

0 0

0 0

0 0

0 0

0 0

0 0

0 0

0 0

0 414 134 65 28 10 6

5 1

2 1

0 1

0 0

0 0

1 0

0 0

0 0

0 0

0 0

0 0

1015 438 212 124 79 34 21 9

11 8

3 2

0 0

0 0

0 0

0 0

0 0

0 0

0 0

0 0

1244 735 577 391 285 249 175 148 124 99 81 60 64 54 31 29 31 16 17 5

14 9

5 5

3 2

5 7

1088 503 344 191 130 77 58 43 16 13 10 10 6

3 0

1 1

1 3

2 1

2 0

2 0

1 0

0 489 148 87 45 26 13 8

8 1

3 2

2 1

2 0

0 0

0 1

0 0

0 0

0 0

0 0

0 370 123 82 47 33 13 14 10 5

1 3

3 2

1 2

0 0

0 0

0 0

0 0

0 0

0 0

0 367 171 124 64 55 31 14 14 6

7 3

0 2

1 2

0 0

1 0

0 0

0 0

0 0

0 0

0 412 205 106 77 50 37 17 21 14 6

6 6

3 5

1 2

1 0

1 0

1 0

0 0

0 0

1 0

491 247 120 79 49 31 31 17 8

11 10 2

4 1

2 1

1 1

0 1

0 0

0 0

0 0

0 0

245 128 73 38 40 18 11 8

1 5

1 0

1 0

0 0

0 0

0 0

0 0

1 0

0 0

0 0

10522 4769 3060 1834 1283 870 572 451 304 232 207 135 126 110 63 46 49 31 30 16 25 15 7

10 5

8 7

8 24808 14286 9517 6457 4623 3340 2470 1898 1447 1143 911 704 569 443 333 270 224 175 144 114 98 73 58 51 41 36 28 21 100.00 57.59 38.36 26.03 18.64 13.46 9.96 7.65 5.83 4.61 3.67 2.84 2.29 1.79 1.34 1.09 0.90 0.71 0.58 0.46 0.40 0.29 0.23 0.21 0.17 0.15 0.11 0.08

METEOROLOGY 2.3-45 WATTS BAR WBNP-101 Meteorological Facility: Watts Bar Nuclear Plant Wind Speed And Direction Measured At The 46.36 Meter Level 30 31 32

>32 TOTAL 0

0 0

0 1941 1

0 0

1 2733 0

0 0

0 2908 0

0 0

0 1602 0

0 0

0 491 0

0 0

0 197 0

0 0

0 274 0

0 0

0 668 0

0 0

0 1956 0

2 0

8 4475 0

0 1

0 2507 0

0 0

0 836 0

0 0

0 709 0

0 0

0 862 0

0 0

0 972 0

0 0

0 1107 0

0 0

0 570 1

2 1

9 24808 13 12 10 9

0.05 0.05 0.04 0.04 MAXIMUM PERSISTENCE (HOURS) 28 33 27 13 8

5 9

18 13 48 32 20 16 19 28 21 24 50.0%

80.0%

90.0%

99.0%

99.9%

3 6

8 16 27 3

6 9

20 29 3

5 7

14 26 2

4 5

9 12 2

3 4

7 8

2 3

4 5

5 2

3 4

8 9

2 3

4 8

18 2

4 5

10 13 4

8 12 23 34 3

5 7

13 25 2

4 5

11 20 2

4 6

13 16 3

5 6

12 19 3

5 7

15 28 3

5 7

13 19 3

5 6

11 24 Table 2.3-16 Wind Direction Persistence Data Disregarding Stability, Watts Bar Nuclear Plant Jan 1, 77 - Dec 31, 93 (Sheet 2 of 2)

Persistence Wind Direction ACC.

ACC.

(Hours)

N NNE NE ENE E

ESE SE SSE S

SSW SW WSW W

WNW NW NNW CALM TOTAL TOTAL FREQUENCY

METEOROLOGY 2.3-46 WATTS BAR WBNP-101 Table 2.3-17 Joint Percentage Frequencies Of Wind Speed By Wind Direction Disregarding Stability Class, Watts Bar Nuclear Plant January (74-93)

Wind Direction Wind Speed(MPH)

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 N

NNE NE ENE E

ESE SE SSE S

SSW SW WSW W

WNW NW NNW SUBTOTAL 0.123 0.136 0.181 0.238 0.130 0.043 0.060 0.116 0.130 0.211 0.150 0.179 0.188 0.168 0.208 0.164 2.425 0.767 0.527 0.870 1.117 0.829 0.329 0.336 0.658 0.555 0.836 0.849 1.144 1.445 1.459 1.692 1.144 14.556 1.411 1.891 2.343 3.110 1.486 0.432 0.740 1.411 1.754 2.911 1.822 2.041 1.904 1.521 2.007 1.767 28.550 1.555 2.418 1.884 1.110 0.370 0.123 0.144 0.329 1.130 3.569 1.514 1.240 0.980 0.959 1.144 1.288 19.755 1.795 2.377 1.069 0.356 0.151 0.034 0.027 0.103 0.706 2.466 0.870 0.877 1.185 1.089 1.260 1.480 15.844 2.158 2.151 0.548 0.110 0.096 0.021 0.000 0.014 0.432 2.850 0.555 0.733 1.329 1.623 1.904 2.048 16.570 0.075 0.110 0.000 0.000 0.000 0.000 0.000 0.027 0.178 0.569 0.151 0.315 0.288 0.158 0.212 0.144 2.226 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.021 0.014 0.021 0.000 0.007 0.014 0.000 0.000 0.000 0.075 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 7.883 9.609 6.894 6.040 3.062 0.981 1.307 2.678 4.897 13.431 5.911 6.536 7.333 6.976 8.428 8.034 100.000 Total Hours Of Valid Wind Observations 14599 Total Hours Of Observations 14880 Recoverability Percentage Total Hours Calm 98.1 354 Meteorological Facility: Watts Bar Nuclear Plant Wind Speed And Direction Measured At 9.72 Meter Level Date Printed: 1-DEC-94 Mean Wind Speed = 4.57 Note: Totals And Subtotals Are Obtained From Unrounded Numbers

METEOROLOGY 2.3-47 WATTS BAR WBNP-101 Table 2.3-18 Joint Percentage Frequencies Of Wind Speed By Wind Direction Disregarding Stability Class, Watts Bar Nuclear Plant January (77-93)

Wind Direction 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 N

NNE NE ENE E

ESE SE SSE S

SSW SW WSW W

WNW NW NNW SUBTOTAL 0.086 0.140 0.170 0.136 0.085 0.030 0.036 0.065 0.104 0.142 0.090 0.066 0.050 0.041 0.042 0.050 1.333 0.372 0.565 0.687 0.678 0.598 0.315 0.380 0.372 0.525 0.412 0.485 0.428 0.291 0.363 0.258 0.307 7.035 1.510 2.504 3.045 2.310 1.260 0.339 0.420 1.058 1.769 2.714 1.486 1.018 0.808 0.541 0.670 0.792 22.244 1.147 2.496 2.722 1.018 0.218 0.089 0.073 0.331 1.171 3.497 1.688 0.767 0.420 0.614 0.743 0.775 17.769 1.446 2.617 1.971 0.533 0.057 0.016 0.073 0.137 0.509 2.859 1.672 0.670 0.775 0.905 1.220 1.074 16.533 3.400 3.473 1.745 0.226 0.024 0.000 0.016 0.024 0.428 4.038 2.811 1.373 1.615 2.367 2.609 2.423 26.573 0.678 0.557 0.057 0.000 0.000 0.000 0.000 0.008 0.121 1.381 0.743 0.517 0.759 0.880 0.953 0.695 7.350 0.000 0.000 0.000 0.000 0.000 0.000 0.008 0.000 0.065 0.291 0.105 0.178 0.218 0.057 0.065 0.000 0.985 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.016 0.032 0.032 0.065 0.032 0.000 0.000 0.000 0.178 8.639 12.352 10.395 4.901 2.241 0.789 1.006 1.995 4.708 15.367 9.112 5.082 4.969 5.768 6.560 6.116 100.000 Total Hours Of Valid Wind Observations 12381 Total Hours Of Observations 12648 Recoverability Percentage Total Hours Calm 97.9 165 Meteorological Facility: Watts Bar Nuclear Plant Wind Speed and Direction Measured at 46.36 Meter Level Date Printed: 1-DEC-94 Mean Wind Speed = 6.34 Note: Totals and Subtotals are Obtained From Unrounded Numbers

METEOROLOGY 2.3-48 WATTS BAR WBNP-101 Table 2.3-19 Joint Percentage Frequencies Of Wind Speed By Wind Direction Disregarding Stability Class, Watts Bar Nuclear Plant February (74-93)

Wind Direction 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 N

NNE NE ENE E

ESE SE SSE S

SSW SW WSW W

WNW NW NNW SUBTOTAL 0.120 0.128 0.170 0.258 0.118 0.035 0.049 0.069 0.116 0.166 0.138 0.152 0.147 0.117 0.180 0.123 2.085 0.693 0.745 0.896 1.536 0.858 0.331 0.474 0.519 0.625 0.806 0.866 1.084 1.302 1.137 1.724 1.031 14.628 1.701 1.807 2.477 3.584 1.491 0.361 0.497 0.851 1.679 2.492 1.882 1.935 1.611 1.189 1.844 1.415 26.816 1.807 2.492 2.078 1.250 0.467 0.098 0.196 0.339 0.994 2.989 1.558 0.986 0.858 0.715 1.024 1.340 19.190 1.634 2.499 1.250 0.354 0.196 0.045 0.038 0.136 0.474 2.612 1.001 0.647 0.768 0.949 1.287 1.235 15.125 2.319 2.868 0.896 0.128 0.083 0.000 0.060 0.128 0.550 3.433 1.084 0.798 1.182 1.438 1.777 2.198 18.942 0.083 0.151 0.030 0.000 0.008 0.000 0.000 0.038 0.294 1.242 0.173 0.256 0.188 0.256 0.196 0.173 3.087 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.008 0.023 0.053 0.008 0.008 0.008 0.023 0.000 0.000 0.128 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 8.357 10.691 7.796 7.108 3.220 0.871 1.314 2.087 4.753 13.792 6.711 5.866 6.064 5.824 8.032 7.516 100.000 Total Hours Of Valid Wind Observations 13283 Total Hours Of Observations 13560 Recoverability Percentage Total Hours Calm 98.0 277 Meteorological Facility: Watts Bar Nuclear Plant Wind Speed And Direction Measured At 9.72 Meter Level Date Printed: 1-DEC-94 Mean Wind Speed = 4.84 Note: Totals And Subtotals Are Obtained From Unrounded Numbers

METEOROLOGY 2.3-49 WATTS BAR WBNP-101 Table 2.3-20 Joint Percentage Frequencies Of Wind Speed By Wind Direction Disregarding Stability Class, Watts Bar Nuclear Plant February (77-93)

Wind Direction 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 N

NNE NE ENE E

ESE SE SSE S

SSW SW WSW W

WNW NW NNW SUBTOTAL 0.073 0.139 0.203 0.137 0.056 0.026 0.026 0.040 0.076 0.086 0.067 0.044 0.040 0.031 0.033 0.045 1.122 0.380 0.654 0.760 0.830 0.503 0.256 0.203 0.300 0.380 0.336 0.336 0.274 0.318 0.318 0.238 0.318 6.404 1.396 2.729 4.160 2.491 0.848 0.371 0.433 0.680 1.457 1.749 1.281 0.804 0.662 0.424 0.556 0.768 20.811 1.228 3.074 3.118 1.316 0.397 0.159 0.168 0.344 0.839 2.562 1.952 0.768 0.495 0.459 0.415 0.839 18.134 1.926 2.526 2.261 0.742 0.132 0.018 0.035 0.088 0.486 2.208 1.625 0.530 0.477 0.601 1.042 0.954 15.652 3.825 3.842 1.926 0.389 0.053 0.000 0.071 0.106 0.627 4.107 2.835 1.157 1.334 2.005 2.579 2.252 27.109 0.821 0.707 0.274 0.035 0.035 0.000 0.009 0.097 0.424 2.129 1.086 0.530 0.592 0.804 0.698 0.874 9.116 0.035 0.000 0.000 0.000 0.000 0.000 0.000 0.035 0.115 0.627 0.194 0.159 0.150 0.088 0.044 0.071 1.519 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.009 0.053 0.026 0.035 0.009 0.000 0.000 0.000 0.132 9.684 13.672 12.702 5.940 2.025 0.830 0.945 1.692 4.413 13.857 9.403 4.302 4.077 4.730 5.606 6.122 100.000 Total Hours Of Valid Wind Observations 11321 Total Hours Of Observations 11520 Recoverability Percentage Total Hours Calm 98.3 127 Meteorological Facility: Watts Bar Nuclear Plant Wind Speed and Direction Measured at 46.36 Meter Level Date Printed: 1-DEC-94 Mean Wind Speed = 6.68 Note: Totals and Subtotals are Obtained From Unrounded Numbers

METEOROLOGY 2.3-50 WATTS BAR WBNP-101 Table 2.3-21 Joint Percentage Frequencies Of Wind Speed By Wind Direction Disregarding Stability Class, Watts Bar Nuclear Plant March (74-93)

Wind Direction 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 N

NNE NE ENE E

ESE SE SSE S

SSW SW WSW W

WNW NW NNW SUBTOTAL 0.097 0.103 0.142 0.223 0.112 0.042 0.059 0.075 0.101 0.137 0.121 0.138 0.127 0.109 0.142 0.092 1.820 0.546 0.770 0.924 1.365 0.903 0.392 0.581 0.609 0.658 0.721 0.868 1.169 1.519 1.246 1.533 0.847 14.653 1.596 1.498 2.212 3.563 1.575 0.546 0.714 1.043 1.568 2.303 1.806 1.883 1.288 1.155 1.603 1.190 25.546 1.659 1.806 1.421 1.029 0.511 0.154 0.280 0.553 1.316 3.402 1.624 0.679 0.693 0.651 1.036 1.008 17.824 1.484 1.729 1.001 0.504 0.161 0.070 0.119 0.217 0.658 3.171 1.155 0.469 0.539 0.616 0.882 1.253 14.030 2.331 2.576 1.113 0.175 0.035 0.021 0.168 0.406 1.344 5.419 1.043 0.574 1.099 1.330 1.890 2.051 21.577 0.189 0.112 0.028 0.014 0.000 0.007 0.105 0.133 0.588 1.911 0.189 0.105 0.210 0.161 0.266 0.210 4.229 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.091 0.063 0.000 0.014 0.063 0.028 0.021 0.007 0.287 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.007 0.000 0.007 0.000 0.021 0.000 0.000 0.000 0.035 7.903 8.595 6.842 6.874 3.298 1.233 2.026 3.036 6.332 17.128 6.814 5.032 5.560 5.296 7.374 6.659 100.000 Total Hours of Valid Wind Observations 14284 Total Hours of Observations 14880 Recoverability Percentage Total Hours Calm 96.0 260 Meteorological Facility: Watts Bar Nuclear Plant Wind Speed and Direction Measured At 9.72 Meter Level Date Printed: 1-DEC-94 Mean Wind Speed = 5.17 Note: Totals and Subtotals Are Obtained From Unrounded Numbers

METEOROLOGY 2.3-51 WATTS BAR WBNP-101 Table 2.3-22 Joint Percentage Frequencies Of Wind Speed By Wind Direction Disregarding Stability Class, Watts Bar Nuclear Plant March (77-93)

Wind Direction 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 N

NNE NE ENE E

ESE SE SSE S

SSW SW WSW W

WNW NW NNW SUBTOTAL 0.106 0.172 0.264 0.157 0.077 0.049 0.033 0.068 0.111 0.128 0.089 0.056 0.051 0.040 0.054 0.050 1.504 0.449 0.581 0.930 0.606 0.515 0.282 0.183 0.216 0.449 0.432 0.349 0.282 0.316 0.249 0.324 0.241 6.405 1.379 2.376 3.614 2.093 0.814 0.557 0.390 0.955 1.462 1.778 1.180 0.689 0.565 0.432 0.606 0.615 19.505 1.246 2.401 2.368 0.972 0.515 0.241 0.332 0.557 1.213 2.725 1.570 0.714 0.407 0.474 0.557 0.565 16.855 1.346 1.653 1.288 0.573 0.282 0.075 0.116 0.191 0.706 2.475 1.886 0.565 0.341 0.507 0.822 0.872 13.698 3.879 3.315 1.894 0.498 0.150 0.042 0.174 0.557 1.205 5.076 3.157 0.905 1.097 1.545 2.019 2.093 27.604 0.797 0.498 0.199 0.058 0.017 0.000 0.150 0.432 0.831 3.780 1.595 0.515 0.640 0.764 0.756 0.989 12.020 0.066 0.000 0.000 0.000 0.000 0.008 0.066 0.033 0.316 0.972 0.307 0.125 0.075 0.083 0.066 0.058 2.176 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.058 0.058 0.042 0.017 0.025 0.017 0.008 0.008 0.233 9.269 10.996 10.556 4.958 2.370 1.253 1.445 3.009 6.349 17.423 10.173 3.869 3.515 4.110 5.213 5.491 100.000 Total Hours Of Valid Wind Observations 12038 Total Hours Of Observations 12648 Recoverability Percentage Total Hours Calm 95.2 181 Meteorological Facility: Watts Bar Nuclear Plant Wind Speed And Direction Measured At 46.36 Meter Level Date Printed: 1-DEC-94 Mean Wind Speed = 7.13 Note: Totals And Subtotals Are Obtained From Unrounded Numbers

METEOROLOGY 2.3-52 WATTS BAR WBNP-101 Table 2.3-23 Joint Percentage Frequencies Of Wind Speed By Wind Direction Disregarding Stability Class, Watts Bar Nuclear Plant April (74-93)

Wind Direction 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 N

NNE NE ENE E

ESE SE SSE S

SSW SW WSW W

WNW NW NNW SUBTOTAL 0.074 0.075 0.113 0.168 0.122 0.056 0.059 0.101 0.134 0.178 0.166 0.177 0.160 0.126 0.152 0.101 1.961 0.651 0.528 0.832 1.223 1.122 0.608 0.695 0.782 1.136 1.028 1.389 1.918 1.744 1.585 1.715 1.078 18.034 0.984 1.129 1.657 2.468 1.563 0.630 0.601 1.433 1.816 2.888 2.258 1.976 1.773 1.201 1.643 1.158 25.177 1.281 1.788 1.100 0.970 0.767 0.355 0.391 0.796 1.592 3.495 1.534 0.789 0.745 0.709 0.832 0.876 18.020 1.230 1.621 1.013 0.528 0.224 0.022 0.145 0.275 0.905 3.597 0.890 0.420 0.644 0.637 0.825 0.861 13.837 1.476 2.128 0.738 0.232 0.058 0.007 0.043 0.297 1.100 5.797 0.695 0.536 1.020 1.426 1.744 1.462 18.758 0.130 0.181 0.022 0.000 0.000 0.000 0.000 0.145 0.579 1.578 0.174 0.159 0.232 0.224 0.232 0.109 3.763 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.007 0.094 0.282 0.036 0.014 0.007 0.000 0.007 0.000 0.449 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 5.828 7.450 5.476 5.588 3.856 1.677 1.933 3.835 7.356 18.842 7.142 5.988 6.326 5.909 7.151 5.645 100.000 Total Hours Of Valid Wind Observations 13818 Total Hours Of Observations 14400 Recoverability Percentage Total Hours Calm 96.0 271 Meteorological Facility: Watts Bar Nuclear Plant Wind Speed And Direction Measured At 9.72 Meter Level Date Printed: 1-DEC-94 Mean Wind Speed = 4.87 Note: Totals And Subtotals Are Obtained From Unrounded Numbers

METEOROLOGY 2.3-53 WATTS BAR WBNP-101 Table 2.3-24 Joint Percentage Frequencies Of Wind Speed By Wind Direction Disregarding Stability Class, Watts Bar Nuclear Plant April (77-93)

Wind Direction Wind Speed (MPH)

Wind 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

NNE NE ENE E

ESE SE SSE S

SSW SW WSW W

WNW NW NNW SUBTOTAL 0.087 0.157 0.228 0.192 0.075 0.047 0.045 0.092 0.158 0.198 0.119 0.075 0.065 0.044 0.058 0.050 1.691 0.401 0.706 0.846 0.750 0.392 0.262 0.218 0.453 0.584 0.610 0.418 0.340 0.384 0.305 0.279 0.279 7.228 0.959 1.735 2.711 2.241 0.776 0.471 0.480 0.985 1.883 2.467 1.439 0.828 0.636 0.384 0.619 0.506 19.119 0.820 1.656 1.500 0.942 0.488 0.340 0.384 0.820 1.691 3.470 1.953 0.750 0.584 0.453 0.549 0.567 16.966 0.968 1.674 1.177 0.619 0.288 0.139 0.174 0.323 1.055 3.862 1.883 0.671 0.471 0.453 1.003 0.689 15.449 2.467 2.642 1.447 0.514 0.227 0.026 0.166 0.480 1.107 6.164 3.025 1.142 1.194 1.857 2.014 1.901 26.373 0.462 0.645 0.209 0.009 0.009 0.000 0.017 0.253 0.575 3.662 1.412 0.567 0.645 1.020 0.610 0.750 10.846 0.009 0.009 0.000 0.000 0.000 0.000 0.000 0.087 0.288 0.828 0.314 0.192 0.070 0.052 0.087 0.035 1.970 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.070 0.157 0.052 0.061 0.017 0.000 0.000 0.000 0.357 6.173 9.224 8.118 5.266 2.255 1.285 1.483 3.493 7.412 21.418 10.616 4.626 4.067 4.569 5.219 4.776 100.000 Total Hours Of Valid Wind Observations 11470 Total Hours Of Observations 12240 Recoverability Percentage Total Hours Calm 93.7 194 Meteorological Facility: Watts Bar Nuclear Plant Wind Speed And Direction Measured At 46.36 Meter Level Date Printed: 1-DEC-94 Mean Wind Speed = 6.93 Note: Totals And Subtotals Are Obtained From Unrounded Numbers

METEOROLOGY 2.3-54 WATTS BAR WBNP-101 Table 2.3-25 Joint Percentage Frequencies Of Wind Speed By Wind Direction Disregarding Stability Class, Watts Bar Nuclear Plant May (74-93)

Wind Direction 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 N

NNE NE ENE E

ESE SE SSE S

SSW SW WSW W

WNW NW NNW SUBTOTAL 0.109 0.099 0.143 0.225 0.183 0.081 0.117 0.178 0.256 0.327 0.281 0.256 0.254 0.165 0.211 0.149 3.035 0.618 0.426 0.633 0.988 1.329 0.682 0.931 1.237 1.315 1.578 1.940 2.409 2.459 1.578 1.940 1.222 21.285 1.237 1.265 1.798 2.836 1.791 0.696 1.066 1.791 3.042 3.980 2.843 1.940 1.869 1.237 1.656 1.308 30.353 1.606 1.748 1.883 1.407 0.768 0.306 0.583 0.725 2.168 4.307 1.812 0.441 0.561 0.633 0.540 0.760 20.247 1.293 1.571 1.094 0.682 0.213 0.028 0.142 0.156 1.080 3.440 0.746 0.320 0.434 0.497 0.441 0.505 12.643 1.208 1.606 0.796 0.284 0.028 0.014 0.057 0.156 0.874 3.397 0.561 0.149 0.362 0.590 0.696 0.739 11.520 0.050 0.057 0.000 0.007 0.007 0.000 0.000 0.014 0.178 0.448 0.050 0.014 0.014 0.021 0.014 0.036 0.910 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.007 0.000 0.000 0.000 0.000 0.000 0.000 0.007 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 6.121 6.773 6.347 6.429 4.320 1.808 2.896 4.257 8.912 17.482 8.234 5.529 5.954 4.721 5.499 4.718 100.000 Total Hours Of Valid Wind Observations 14071 Total Hours Of Observations 14880 Recoverability Percentage Total Hours Calm 94.6 427 Meteorological Facility: Watts Bar Nuclear Plant Wind Speed And Direction Measured At 9.72 Meter Level Date Printed: 1-DEC-94 Mean Wind Speed = 3.87 Note: Totals And Subtotals Are Obtained From Unrounded Numbers

METEOROLOGY 2.3-55 WATTS BAR WBNP-101 Table 2.3-26 Joint Percentage Frequencies Of Wind Speed By Wind Direction Disregarding Stability Class, Watts Bar Nuclear Plant May (77-93)

Wind Direction 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 N

NNE NE ENE E

ESE SE SSE S

SSW SW WSW W

WNW NW NNW SUBTOTAL 0.114 0.220 0.324 0.266 0.119 0.068 0.080 0.141 0.241 0.296 0.189 0.112 0.093 0.066 0.072 0.081 2.481 0.504 0.944 1.318 1.163 0.610 0.268 0.325 0.635 0.748 0.822 0.610 0.553 0.496 0.382 0.366 0.415 10.160 1.123 2.213 3.319 2.644 1.090 0.708 0.822 1.383 2.709 3.425 2.099 1.058 0.838 0.569 0.659 0.740 25.397 1.098 1.912 2.310 1.155 0.700 0.488 0.439 0.797 2.017 4.417 2.253 0.683 0.399 0.415 0.439 0.578 20.101 1.245 1.757 1.432 0.838 0.203 0.065 0.203 0.212 1.131 3.474 2.001 0.537 0.317 0.358 0.447 0.635 14.854 2.099 2.253 1.464 0.700 0.114 0.049 0.220 0.260 1.180 5.255 2.628 0.716 0.667 0.879 0.968 0.984 20.434 0.382 0.366 0.089 0.049 0.000 0.008 0.000 0.081 0.374 2.595 0.773 0.212 0.236 0.220 0.268 0.187 5.841 0.016 0.000 0.000 0.000 0.000 0.000 0.000 0.016 0.065 0.456 0.106 0.033 0.000 0.008 0.000 0.016 0.716 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.016 0.000 0.000 0.000 0.000 0.000 0.000 0.016 6.581 9.665 10.256 6.814 2.836 1.654 2.089 3.525 8.465 20.755 10.658 3.903 3.046 2.897 3.220 3.635 100.000 Total Hours Of Valid Wind Observations 12293 Total Hours Of Observations 12648 Recoverability Percentage Total Hours Calm 97.2 305 Meteorological Facility: Watts Bar Nuclear Plant Wind Speed And Direction Measured At 46.36 Meter Level 1-DEC-94 Mean Wind Speed = 5.53 Note: Totals And Subtotals Are Obtained From Unrounded Numbers

METEOROLOGY 2.3-56 WATTS BAR WBNP-101 Table 2.3-27 Joint Percentage Frequencies Of Wind Speed By Wind Direction Disregarding Stability Class, Watts Bar Nuclear Plant June (74-93)

Wind Direction 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 N

NNE NE ENE E

ESE SE SSE S

SSW SW WSW W

WNW NW NNW SUBTOTAL 0.078 0.077 0.097 0.185 0.158 0.068 0.113 0.174 0.294 0.376 0.319 0.265 0.218 0.185 0.193 0.111 2.910 0.403 0.403 0.454 0.850 1.102 0.605 0.951 1.390 1.599 1.643 2.305 2.377 2.240 1.844 2.082 0.994 21.245 1.023 1.001 1.304 2.521 1.765 0.627 1.102 1.765 3.753 5.187 3.487 2.449 1.722 1.520 1.426 1.016 31.669 1.801 1.679 1.304 1.527 0.605 0.180 0.461 0.720 2.637 5.619 2.183 0.483 0.555 0.569 0.526 0.778 21.627 1.174 1.477 0.627 0.490 0.173 0.050 0.043 0.245 1.297 4.005 1.001 0.202 0.382 0.612 0.497 0.576 12.852 0.994 1.830 0.483 0.137 0.014 0.029 0.000 0.086 0.713 3.112 0.317 0.072 0.195 0.418 0.360 0.439 9.200 0.050 0.166 0.000 0.007 0.000 0.007 0.007 0.000 0.029 0.158 0.007 0.000 0.014 0.007 0.014 0.029 0.497 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 5.525 6.633 4.268 5.718 3.817 1.566 2.678 4.381 10.323 20.100 9.619 5.849 5.326 5.156 5.099 3.943 100.000 Total Hours Of Valid Wind Observations 13381 Total Hours Of Observations 14400 Recoverability Percentage Total Hours Calm 96.4 404 Meteorological Facility: Watts Bar Nuclear Plant Wind Speed And Direction Measured At 9.72 Meter Level Date Printed: 1-DEC-94 Mean Wind Speed = 3.62 Note: Totals And Subtotals Are Obtained From Unrounded Numbers

METEOROLOGY 2.3-57 WATTS BAR WBNP-101 Table 2.3-28 Joint Percentage Frequencies Of Wind Speed By Wind Direction Disregarding Stability Class, Watts Bar Nuclear Plant June (77-93)

Wind Direction 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 N

NNE NE ENE E

ESE SE SSE S

SSW SW WSW W

WNW NW NNW SUBTOTAL 0.107 0.174 0.231 0.195 0.109 0.054 0.068 0.133 0.225 0.254 0.149 0.091 0.066 0.065 0.050 0.058 2.030 0.792 0.944 1.340 1.078 0.784 0.371 0.472 0.716 0.927 0.767 0.725 0.463 0.463 0.573 0.421 0.447 11.281 1.163 2.224 2.881 2.477 1.213 0.615 0.775 1.702 3.185 3.859 1.997 1.188 0.741 0.615 0.497 0.615 25.748 1.137 2.056 1.938 1.331 0.615 0.329 0.514 0.977 2.603 6.471 2.898 0.893 0.379 0.396 0.354 0.463 23.355 1.196 1.592 1.053 0.767 0.261 0.076 0.076 0.329 1.255 4.870 2.182 0.371 0.354 0.404 0.404 0.514 15.705 1.988 2.334 0.994 0.447 0.126 0.034 0.034 0.194 0.876 5.771 2.755 0.615 0.607 0.767 0.581 0.699 18.822 0.219 0.388 0.017 0.008 0.000 0.000 0.008 0.008 0.135 1.297 0.480 0.110 0.051 0.051 0.042 0.110 2.924 0.008 0.008 0.008 0.000 0.000 0.008 0.000 0.000 0.008 0.042 0.008 0.000 0.017 0.000 0.008 0.000 0.118 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.017 0.000 0.000 0.000 0.000 0.000 0.000 0.017 6.612 9.720 8.463 6.303 3.109 1.486 1.947 4.059 9.215 23.347 11.195 3.730 2.678 2.871 2.359 2.906 100.000 Total Hours Of Valid Wind Observations 11869 Total Hours Of Observations 12240 Recoverability Percentage Total Hours Calm 97.0 241 Meteorological Facility: Watts Bar Nuclear Plant Wind Speed And Direction Measured At 46.36 Meter Level Date Printed: 1-DEC-94 Mean Wind Speed = 4.98 Note: Totals And Subtotals Are Obtained From Unrounded Numbers

METEOROLOGY 2.3-58 WATTS BAR WBNP-101 Table 2.3-29 Joint Percentage Frequencies Of Wind Speed By Wind Direction Disregarding Stability Class, Watts Bar Nuclear Plant July (74-93)

Wind Direction 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 N

NNE NE ENE E

ESE SE SSE S

SSW SW WSW W

WNW NW NNW SUBTOTAL 0.062 0.058 0.068 0.126 0.118 0.060 0.104 0.169 0.246 0.310 0.268 0.223 0.182 0.158 0.161 0.095 2.409 0.414 0.387 0.373 0.656 1.049 0.518 0.870 1.415 1.664 1.885 2.168 2.575 2.154 1.899 1.892 1.091 21.008 1.056 1.001 1.243 2.347 1.760 0.918 1.609 2.603 4.211 5.516 4.225 2.748 2.195 1.878 1.947 1.174 36.431 1.388 1.643 1.747 1.574 0.884 0.394 0.670 1.084 2.996 5.647 1.843 0.587 0.580 0.663 0.456 0.677 22.831 0.808 1.719 1.084 0.614 0.166 0.055 0.076 0.214 1.042 3.238 0.683 0.193 0.338 0.373 0.407 0.545 11.557 0.373 1.070 0.366 0.138 0.055 0.000 0.035 0.124 0.504 1.685 0.249 0.069 0.200 0.166 0.269 0.311 5.613 0.000 0.021 0.014 0.000 0.000 0.000 0.007 0.000 0.014 0.076 0.000 0.000 0.000 0.007 0.007 0.007 0.152 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 4.100 5.899 4.893 5.456 4.032 1.945 3.369 5.609 10.678 18.357 9.436 6.395 5.650 5.143 5.139 3.899 100.000 Total Hours Of Valid Wind Observations 14485 Total Hours Of Observations 14880 Recoverability Percentage Total Hours Calm 97.3 349 Meteorological Facility: Watts Bar Nuclear Plant Wind Speed And Direction Measured At 9.72 Meter Level Date Printed: 1-DEC-94 Mean Wind Speed = 3.32 Note: Totals And Subtotals Are Obtained From Unrounded Numbers

METEOROLOGY 2.3-59 WATTS BAR WBNP-101 Table 2.3-30 Joint Percentage Frequencies Of Wind Speed By Wind Direction Disregarding Stability Class, Watts Bar Nuclear Plant July (77-93)

Wind Direction 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 N

NNE NE ENE E

ESE SE SSE S

SSW SW WSW W

WNW NW NNW SUBTOTAL 0.088 0.122 0.161 0.120 0.071 0.034 0.050 0.104 0.165 0.219 0.120 0.059 0.051 0.042 0.050 0.046 1.501 0.833 0.899 1.279 0.883 0.602 0.256 0.256 0.627 0.874 0.866 0.544 0.610 0.470 0.478 0.495 0.454 10.427 1.468 2.302 2.929 2.252 1.262 0.635 1.064 2.095 3.448 4.867 2.607 0.940 0.874 0.610 0.808 0.759 28.923 1.237 1.873 2.062 1.526 0.800 0.462 0.817 1.171 2.854 7.095 3.003 0.932 0.652 0.346 0.561 0.495 25.887 1.064 1.947 1.477 0.982 0.363 0.132 0.173 0.256 1.279 4.917 2.079 0.610 0.437 0.412 0.388 0.487 17.002 0.940 1.980 0.973 0.429 0.074 0.066 0.049 0.198 0.998 4.290 1.881 0.544 0.454 0.553 0.454 0.635 14.519 0.041 0.132 0.016 0.025 0.000 0.000 0.025 0.025 0.066 0.643 0.355 0.099 0.082 0.025 0.107 0.016 1.658 0.000 0.008 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.041 0.008 0.008 0.000 0.008 0.000 0.008 0.082 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 5.673 9.263 8.897 6.216 3.173 1.585 2.434 4.476 9.685 22.938 10.597 3.804 3.021 2.475 2.863 2.901 100.000 Total Hours Of Valid Wind Observations 12122 Total Hours Of Observations 12648 Recoverability Percentage Total Hours Calm 95.8 182 Meteorological Facility: Watts Bar Nuclear Plant Wind Speed And Direction Measured At 46.36 Meter Level Date Printed: 1-DEC-94 Mean Wind Speed = 4.62 Note: Totals And Subtotals Are Obtained From Unrounded Numbers

METEOROLOGY 2.3-60 WATTS BAR WBNP-101 Table 2.3-31 Joint Percentage Frequencies Of Wind Speed By Wind Direction Disregarding Stability Class, Watts Bar Nuclear Plant August (74-93)

Wind Direction 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 N

NNE NE ENE E

ESE SE SSE S

SSW SW WSW W

WNW NW NNW SUBTOTAL 0.132 0.101 0.153 0.278 0.185 0.080 0.120 0.226 0.349 0.409 0.342 0.310 0.258 0.242 0.307 0.189 3.681 0.672 0.367 0.471 0.915 1.109 0.499 0.749 1.199 1.754 1.865 2.156 2.558 2.385 2.302 2.808 1.359 23.170 1.428 1.241 1.955 3.494 1.823 0.776 1.165 2.392 3.792 4.638 3.279 2.371 1.712 1.539 2.073 1.636 35.316 1.934 1.907 1.913 2.045 0.991 0.354 0.506 1.026 2.940 4.368 1.220 0.395 0.333 0.444 0.451 0.638 21.464 1.130 2.004 0.887 0.499 0.139 0.014 0.125 0.277 1.075 2.662 0.263 0.076 0.187 0.153 0.257 0.624 10.372 0.770 1.414 0.492 0.250 0.049 0.014 0.090 0.111 0.603 1.456 0.069 0.007 0.014 0.076 0.097 0.381 5.893 0.014 0.035 0.007 0.000 0.000 0.000 0.000 0.000 0.007 0.021 0.000 0.000 0.000 0.000 0.007 0.014 0.104 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 6.081 7.069 5.879 7.481 4.296 1.737 2.755 5.232 10.520 15.419 7.330 5.718 4.889 4.755 5.999 4.840 100.000 Total Hours Of Valid Wind Observations 14424 Total Hours Of Observations 14880 Recoverability Percentage Total Hours Calm 96.9 531 Meteorological Facility: Watts Bar Nuclear Plant Date Printed: 1-DEC-94 Wind Speed And Direction Measured At 9.72 Meter Level Mean Wind Speed = 3.20 Note: Totals And Subtotals Are Obtained From Unrounded Numbers

METEOROLOGY 2.3-61 WATTS BAR WBNP-101 Table 2.3-32 98Joint Percentage Frequencies Of Wind Speed By Wind Direction Disregarding Stability Class, Watts Bar Nuclear Plant August (77-93)

Wind Direction 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 N

NNE NE ENE E

ESE SE SSE S

SSW SW WSW W

WNW NW NNW SUBTOTAL 0.134 0.241 0.346 0.275 0.140 0.077 0.086 0.153 0.277 0.356 0.191 0.088 0.069 0.066 0.086 0.082 2.664 0.737 1.131 1.474 1.332 0.972 0.528 0.461 0.737 1.072 1.014 0.771 0.486 0.461 0.394 0.528 0.519 12.616 1.483 2.848 4.247 3.209 1.349 0.746 0.955 1.784 3.502 4.867 2.379 0.963 0.679 0.704 0.888 0.829 31.432 1.424 2.161 2.622 2.237 0.880 0.578 0.570 1.081 2.957 5.831 2.212 0.670 0.302 0.352 0.352 0.662 24.889 1.206 2.111 1.659 0.888 0.285 0.101 0.159 0.402 1.198 4.071 1.374 0.218 0.159 0.209 0.268 0.469 14.778 1.625 2.186 0.963 0.511 0.151 0.059 0.151 0.226 0.871 3.301 0.930 0.193 0.201 0.226 0.285 0.586 12.465 0.142 0.109 0.067 0.050 0.008 0.008 0.008 0.017 0.042 0.352 0.117 0.025 0.008 0.025 0.084 0.075 1.139 0.000 0.008 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.008 0.000 0.000 0.000 0.000 0.000 0.000 0.017 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 6.752 10.796 11.379 8.501 3.784 2.096 2.389 4.400 9.919 19.799 7.973 2.643 1.878 1.976 2.490 3.223 100.000 Total Hours Of Valid Wind Observations 11937 Total Hours Of Observations 12648 Recoverability Percentage Total Hours Calm 94.4 318 Meteorological Facility: Watts Bar Nuclear Plant Wind Speed And Direction Measured At 46.36 Meter Level Date Printed: 1-DEC-94 Mean Wind Speed = 4.24 Note: Totals And Subtotals Are Obtained From Unrounded Numbers

METEOROLOGY 2.3-62 WATTS BAR WBNP-101 Table 2.3-33 Joint Percentage Frequencies Of Wind Speed By Wind Direction Disregarding Stability Class, Watts Bar Nuclear Plant September (74-93)

Wind Direction 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 N

NNE NE ENE E

ESE SE SSE S

SSW SW WSW W

WNW NW NNW SUBTOTAL 0.188 0.155 0.186 0.274 0.166 0.059 0.088 0.171 0.307 0.348 0.281 0.271 0.290 0.327 0.430 0.278 3.821 0.890 0.550 0.601 0.999 0.818 0.268 0.391 0.912 1.397 1.418 1.737 2.178 2.489 2.967 3.813 2.055 23.480 1.780 1.657 2.048 2.902 1.548 0.579 0.861 1.520 2.981 3.531 2.265 1.686 1.643 1.693 2.315 1.903 30.912 2.091 2.554 2.677 1.512 0.695 0.159 0.224 0.651 2.113 3.944 1.165 0.326 0.326 0.470 0.535 1.035 20.478 1.664 2.352 1.368 0.347 0.080 0.022 0.072 0.174 1.143 2.598 0.355 0.065 0.195 0.268 0.434 0.673 11.809 1.158 3.169 0.984 0.145 0.036 0.022 0.014 0.058 0.767 1.382 0.072 0.014 0.072 0.166 0.355 0.796 9.211 0.029 0.130 0.022 0.000 0.000 0.000 0.014 0.000 0.029 0.058 0.000 0.000 0.000 0.000 0.000 0.000 0.282 0.000 0.000 0.007 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 0.007 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 7.800 10.567 7.892 6.178 3.343 1.109 1.665 3.485 8.737 13.278 5.874 4.541 5.015 5.892 7.883 6.740 100.000 Total Hours Of Valid Wind Observations 13820 Total Hours Of Observations 14400 Recoverability Percentage Total Hours Calm 96.0 528 Meteorological Facility: Watts Bar Nuclear Plant Wind Speed And Direction Measured At 9.72 Meter Level Date Printed: 1-DEC-94 Mean Wind Speed = 3.51 Note: Totals And Subtotals Are Obtained From Unrounded Numbers

METEOROLOGY 2.3-63 WATTS BAR WBNP-101 Table 2.3-34 Joint Percentage Frequencies Of Wind Speed By Wind Direction Disregarding Stability Class, Watts Bar Nuclear Plant September (77-93)

Wind Direction 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 N

NNE NE ENE E

ESE SE SSE S

SSW SW WSW W

WNW NW NNW SUBTOTAL 0.129 0.256 0.388 0.299 0.148 0.089 0.094 0.169 0.277 0.336 0.169 0.104 0.072 0.074 0.080 0.085 2.770 0.604 0.968 1.545 1.438 1.128 0.613 0.586 0.844 1.083 1.243 0.790 0.488 0.462 0.417 0.444 0.506 13.159 1.261 2.744 4.067 2.895 1.012 0.675 0.781 1.607 2.930 3.623 1.652 1.021 0.577 0.657 0.710 0.719 26.931 1.501 2.753 3.312 1.598 0.426 0.364 0.249 0.915 2.060 4.466 1.900 0.551 0.329 0.284 0.364 0.586 21.657 1.403 2.690 2.060 0.666 0.186 0.053 0.080 0.275 0.861 3.570 1.438 0.240 0.222 0.204 0.293 0.648 14.891 2.646 3.871 2.131 0.444 0.044 0.036 0.062 0.231 1.048 3.818 1.279 0.195 0.240 0.479 0.657 1.021 18.203 0.169 0.657 0.240 0.027 0.000 0.009 0.027 0.000 0.124 0.719 0.044 0.018 0.044 0.044 0.036 0.115 2.273 0.000 0.018 0.018 0.000 0.000 0.000 0.009 0.000 0.009 0.062 0.000 0.000 0.000 0.000 0.000 0.000 0.115 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 7.712 13.957 13.760 7.367 2.945 1.838 1.888 4.041 8.393 17.838 7.272 2.617 1.945 2.161 2.584 3.681 100.000 Total Hours Of Valid Wind Observations 11262 Total Hours Of Observations 12240 Recoverability Percentage Total Hours Calm 92.0 312 Meteorological Facility: Watts Bar Nuclear Plant Wind Speed And Direction Measured At 46.36 Meter Level Date Printed: 1-DEC-94 Mean Wind Speed = 4.74 Note: Totals And Subtotals Are Obtained From Unrounded Numbers

METEOROLOGY 2.3-64 WATTS BAR WBNP-101 Table 2.3-35 Joint Percentage Frequencies Of Wind Speed By Wind Direction Disregarding Stability Class, Watts Bar Nuclear Plant October (74-93)

Wind Direction 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 N

NNE NE ENE E

ESE SE SSE S

SSW SW WSW W

WNW NW NNW SUBTOTAL 0.269 0.225 0.262 0.374 0.195 0.069 0.103 0.197 0.333 0.369 0.308 0.383 0.472 0.510 0.696 0.350 5.117 1.027 0.847 0.798 1.326 0.909 0.389 0.562 0.757 1.125 1.083 1.354 2.083 3.082 3.686 4.638 1.993 25.660 1.805 1.527 1.965 2.617 1.146 0.333 0.528 1.319 2.388 2.805 1.888 1.958 1.895 1.687 2.701 1.701 28.263 1.861 2.194 1.937 1.222 0.396 0.083 0.118 0.292 1.673 3.076 1.062 0.458 0.410 0.673 0.660 1.125 17.238 1.937 1.923 1.222 0.340 0.111 0.000 0.049 0.160 0.833 2.312 0.444 0.208 0.299 0.569 0.576 0.868 11.851 2.055 2.298 0.757 0.118 0.076 0.021 0.028 0.069 0.639 2.083 0.194 0.104 0.368 0.660 0.618 1.264 11.351 0.049 0.146 0.000 0.000 0.000 0.000 0.000 0.021 0.062 0.153 0.007 0.007 0.000 0.021 0.035 0.021 0.521 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 9.002 9.160 6.941 5.998 2.833 0.895 1.388 2.814 7.054 11.880 5.258 5.202 6.526 7.806 9.923 7.321 100.000 Total Hours Of Valid Wind Observations 14404 Total Hours Of Observations 14880 Recoverability Percentage Total Hours Calm 96.8 737 Meteorological Facility: Watts Bar Nuclear Plant Wind Speed And Direction Measured At 9.72 Meter Level Date Printed: 1-DEC-94 Mean Wind Speed = 3.56 Note: Totals And Subtotals Are Obtained From Unrounded Numbers

METEOROLOGY 2.3-65 WATTS BAR WBNP-101 Table 2.3-36 Joint Percentage Frequencies Of Wind Speed By Wind Direction Disregarding Stability Class, Watts Bar Nuclear Plant October (77-93)

Wind Direction 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 N

NNE NE ENE E

ESE SE SSE S

SSW SW WSW W

WNW NW NNW Subtotal 0.163 0.317 0.487 0.456 0.235 0.118 0.119 0.207 0.328 0.410 0.241 0.138 0.132 0.082 0.098 0.089 3.622 0.562 0.855 1.595 1.579 1.514 0.863 0.724 0.944 1.164 1.017 0.830 0.570 0.610 0.366 0.480 0.399 14.072 1.221 2.613 3.728 3.410 1.058 0.431 0.578 1.318 2.417 3.467 1.807 0.944 0.830 0.529 0.586 0.578 25.515 1.025 2.450 2.588 1.001 0.350 0.163 0.195 0.480 1.587 3.996 1.620 0.619 0.244 0.350 0.383 0.521 17.571 1.660 2.197 1.628 0.619 0.163 0.016 0.049 0.155 0.798 3.280 1.367 0.415 0.277 0.439 0.578 0.676 14.316 3.768 2.962 1.717 0.236 0.090 0.000 0.057 0.244 0.822 3.841 1.563 0.464 0.570 1.213 1.099 1.701 20.347 0.602 0.285 0.065 0.024 0.016 0.000 0.008 0.057 0.252 1.465 0.358 0.138 0.179 0.317 0.179 0.439 4.387 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.033 0.098 0.024 0.000 0.000 0.008 0.000 0.008 0.171 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 9.002 11.679 11.808 7.325 3.426 1.591 1.731 3.406 7.400 17.575 7.810 3.288 2.842 3.305 3.402 4.411 100.000 Total Hours Of Valid Wind Observations 12287 Total Hours Of Observations 12648 Recoverability Percentage Total Hours Calm 97.1 445 Meteorological Facility: Watts Bar Nuclear Plant Wind Speed And Direction Measured At 46.36 Meter Level Date Printed: 1-DEC-94 Mean Wind Speed = 5.03 Note: Totals And Subtotals Are Obtained From Unrounded Numbers

METEOROLOGY 2.3-66 WATTS BAR WBNP-101 Table 2.3-37 Joint Percentage Frequencies Of Wind Speed By Wind Direction Disregarding Stability Class, Watts Bar Nuclear Plant November (74-93)

Wind Direction 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 N

NNE NE ENE E

ESE SE SSE S

SSW SW WSW W

WNW NW NNW SUBTOTAL 0.190 0.241 0.254 0.329 0.190 0.058 0.071 0.114 0.228 0.289 0.242 0.305 0.368 0.359 0.425 0.278 3.940 1.041 1.091 0.969 1.292 1.019 0.366 0.402 0.452 0.746 0.804 1.077 1.644 2.476 2.792 3.172 1.931 21.273 1.378 1.974 2.268 2.892 1.400 0.366 0.495 0.998 2.153 2.871 2.002 2.239 2.203 1.773 2.239 1.601 28.852 1.636 2.261 1.694 0.976 0.359 0.065 0.136 0.416 1.199 3.560 1.170 0.754 0.739 0.545 1.019 1.234 17.764 1.493 2.153 1.062 0.179 0.014 0.000 0.050 0.108 0.660 2.727 0.782 0.452 0.725 0.560 0.883 1.191 13.041 1.737 2.089 0.488 0.043 0.007 0.007 0.065 0.194 0.761 3.223 0.323 0.416 0.897 0.775 1.041 1.471 13.536 0.151 0.072 0.007 0.000 0.000 0.000 0.029 0.043 0.230 0.646 0.043 0.065 0.036 0.072 0.086 0.079 1.557 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.036 0.000 0.000 0.000 0.000 0.000 0.000 0.036 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 7.626 9.880 6.743 5.712 2.989 0.861 1.248 2.325 5.977 14.155 5.639 5.875 7.445 6.876 8.866 7.785 100.000 Total Hours Of Valid Wind Observations 13933 Total Hours Of Observations 14400 Recoverability Percentage Total Hours Calm 96.8 549 Meteorological Facility: Watts Bar Nuclear Plant Wind Speed And Direction Measured At 9.72 Meter Level Date Printed: 1-DEC-94 Mean Wind Speed = 3.99 Note: Totals And Subtotals Are Obtained From Unrounded Numbers

METEOROLOGY 2.3-67 WATTS BAR WBNP-101 Table 2.3-38 Joint Percentage Frequencies Of Wind Speed By Wind Direction Disregarding Stability Class, Watts Bar Nuclear Plant November (77-93)

Wind Direction 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 N

NNE NE ENE E

ESE SE SSE S

SSW SW WSW W

WNW NW NNW Subtotal 0.116 0.201 0.326 0.273 0.133 0.054 0.062 0.104 0.187 0.227 0.142 0.102 0.072 0.052 0.073 0.085 2.208 0.573 0.952 1.180 1.180 0.944 0.548 0.514 0.531 0.725 0.716 0.641 0.405 0.489 0.346 0.455 0.455 10.653 1.306 2.309 4.121 3.253 1.222 0.337 0.489 1.155 2.318 2.967 1.660 1.256 0.674 0.506 0.733 0.927 25.234 1.096 2.056 2.756 1.129 0.270 0.067 0.143 0.320 1.306 3.767 1.896 0.767 0.379 0.430 0.506 0.716 17.606 1.290 2.309 1.787 0.497 0.084 0.008 0.067 0.160 0.750 2.958 1.433 0.615 0.430 0.379 0.573 0.784 14.126 3.253 2.857 1.795 0.160 0.000 0.000 0.093 0.253 0.809 4.560 2.158 0.818 1.037 1.155 1.525 2.014 22.486 0.725 0.396 0.126 0.000 0.000 0.000 0.025 0.160 0.539 2.200 0.725 0.464 0.346 0.396 0.303 0.480 6.886 0.034 0.008 0.000 0.000 0.000 0.000 0.000 0.042 0.126 0.371 0.051 0.110 0.017 0.000 0.000 0.008 0.767 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.017 0.008 0.008 0.000 0.000 0.000 0.000 0.034 8.392 11.090 12.092 6.493 2.653 1.015 1.393 2.725 6.761 17.782 8.713 4.544 3.443 3.264 4.169 5.471 100.000 Total Hours Of Valid Wind Observations 11865 Total Hours Of Observations 12240 Recoverability Percentage Total Hours Calm 96.9 262 Meteorological Facility: Watts Bar Nuclear Plant Wind Speed And Direction Measured At 46.36 Meter Level Date Printed: 1-DEC-94 Mean Wind Speed = 5.73 Note: Totals And Subtotals Are Obtained From Unrounded Numbers

METEOROLOGY 2.3-68 WATTS BAR WBNP-101 Table 2.3-39 Joint Percentage Frequencies Of Wind Speed By Wind Direction Disregarding Stability Class, Watts Bar Nuclear Plant December (74-93)

Wind Direction 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 N

NNE NE ENE E

ESE SE SSE S

SSW SW WSW W

WNW NW NNW Subtotal 0.098 0.110 0.144 0.187 0.090 0.025 0.043 0.092 0.133 0.167 0.149 0.174 0.191 0.169 0.234 0.144 2.149 0.759 0.752 0.929 1.106 0.851 0.270 0.355 0.745 0.674 0.816 1.014 1.475 1.915 2.085 2.426 1.496 17.667 1.390 1.667 2.234 3.014 1.135 0.270 0.589 1.277 2.241 2.851 2.262 2.362 2.277 1.638 2.709 1.674 29.589 1.511 2.050 1.766 0.908 0.177 0.021 0.106 0.227 1.312 4.163 1.511 0.858 0.979 0.610 0.965 0.957 18.121 1.709 2.064 0.950 0.199 0.028 0.000 0.021 0.050 0.546 3.206 0.908 0.539 0.865 0.858 0.943 1.248 14.135 2.390 2.411 0.709 0.035 0.000 0.000 0.014 0.057 0.504 3.667 0.511 0.355 1.128 1.213 1.603 1.787 16.383 0.071 0.170 0.007 0.000 0.007 0.000 0.007 0.028 0.277 0.539 0.078 0.064 0.099 0.121 0.156 0.170 1.794 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.035 0.121 0.000 0.000 0.000 0.007 0.000 0.000 0.163 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 7.928 9.223 6.740 5.450 2.289 0.585 1.135 2.475 5.721 15.528 6.433 5.827 7.453 6.701 9.035 7.477 100.000 Total Hours Of Valid Wind Observations 14100 Total Hours Of Observations 14880 Recoverability Percentage Total Hours Calm 94.8 303 Meteorological Facility: Watts Bar Nuclear Plant Wind Speed And Direction Measured At 9.72 Meter Level Date Printed: 1-DEC-94 Mean Wind Speed = 4.39 Note: Totals And Subtotals Are Obtained From Unrounded Numbers

METEOROLOGY 2.3-69 WATTS BAR WBNP-101 Table 2.3-40 Joint Percentage Frequencies Of Wind Speed By Wind Direction Disregarding Stability Class, Watts Bar Nuclear Plant December (77-93)

Wind Direction 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 N

NNE NE ENE E

ESE SE SSE S

SSW SW WSW W

WNW NW NNW Subtotal 0.074 0.112 0.158 0.127 0.068 0.039 0.037 0.068 0.135 0.178 0.103 0.068 0.050 0.049 0.043 0.044 1.352 0.514 0.506 0.763 0.647 0.713 0.456 0.315 0.506 0.639 0.713 0.498 0.456 0.365 0.481 0.365 0.307 8.244 1.128 1.982 2.762 2.190 0.796 0.423 0.514 1.004 2.364 3.260 1.800 1.053 0.738 0.605 0.589 0.672 21.879 1.169 2.281 2.621 0.887 0.199 0.066 0.116 0.274 1.178 4.023 2.015 0.846 0.547 0.406 0.597 0.705 17.931 1.186 2.206 1.841 0.431 0.033 0.008 0.025 0.083 0.605 3.243 1.825 0.705 0.481 0.506 0.763 0.763 14.705 3.973 3.658 1.650 0.166 0.000 0.000 0.025 0.116 0.547 4.462 3.351 1.037 1.286 1.858 2.007 2.331 26.466 0.836 0.547 0.174 0.000 0.008 0.000 0.017 0.033 0.299 2.604 0.896 0.340 0.340 0.722 0.647 0.763 8.228 0.058 0.033 0.000 0.000 0.000 0.000 0.008 0.008 0.100 0.489 0.124 0.075 0.041 0.066 0.050 0.050 1.103 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.800 0.041 0.017 0.017 0.000 0.000 0.008 0.000 0.091 8.940 11.325 9.970 4.448 1.818 0.993 1.057 2.091 5.874 19.014 10.628 4.596 3.848 4.693 5.069 5.634 100.000 Total Hours Of Valid Wind Observations 12057 Total Hours Of Observations 12648 Recoverability Percentage Total Hours Calm 95.3 163 Meteorological Facility: Watts Bar Nuclear Plant Wind Speed And Direction Measured At 46.36 Meter Level Date Printed: 1-DEC-94 Mean Wind Speed = 6.36 Note: Totals And Subtotals Are Obtained From Unrounded Numbers

2.3-70 METEOROLOGY WATTS BAR WBNP-101 THIS PAGE IS INTENTIONALLY LEFT BLANK

METEOROLOGY 2.3-71 WATTS BAR WBNP-101 All columns and calm total 100 percent of net valid observations, which represent 91 percent of total record.

• Watts Bar temporary meteorological facility. Wind instruments 10 meters aboveground.

• • Wind speed class 1-3 mph includes values 0.6-3.5 mph; class 4-7 mph includes values 3.6-7.5 mph; etc.

Table 2.3-41 Percent Occurrence Of Wind Speed*

For All Wind Directions July 1, 1971 - June 28, 1972 Annual Wind Wind Speed (MPH)**

Direction 1-3 4-7 8-12 13-18

> 19 Total N

NNE NE ENE E

ESE SE SSE S

SSW SW WSW W

WNW NW NNW Total 4.33 4.16 5.26 3.9 1.64 1.11 1.72 2.27 2.94 2.54 2.54 2.07 2.18 2.38 4.97 5.71 49.72 1.07 2.11 4.12 2.07 0.5 0.45 0.5 0.81 2.83 4.69 3.08 1.08 1.26 1.21 1.74 2.13 29.65 0.14 0.29 0.49 0.23 0.04 0.25 0.33 0.16 0.68 1.8 0.62 0.2 1.02 0.9 0.73 0.29 8.17 0.03 0.01 0.01 0.15 0.33 0.04 0.03 0.09 0.01 0.06 0.05 0.81 5.57 6.57 9.87 6.21 2.18 1.81 2.55 3.24 6.6 9.36 6.28 3.38 4.55 4.5 7.5 8.18 88.35 Calm = 11.64

2.3-72 METEOROLOGY WATTS BAR WBNP-101 Inversion Conditions Distributed Within Total Hours With Valid Vertical Temperature Difference Data. Stability Classes Distributed Within Total Hours With Valid Wind Direction, Wind Speed, And Vertical Temperature Difference Data.

Meteorological Facility Located 0.8 Km Ssw Of Watts Bar Nuclear Plant. Temperature Difference Between 9.51 And 45.63 Meters And Wind Direction And Wind Speed At 9.72 Meter Level.

Table 2.3-42 Percent Occurrences Of Inversion Conditions And Pasquill Stability Classes A-G*

Watts Bar Nuclear Plant Jan 1, 74 - Dec 31, 93 STABILITY CLASS INVERSIONS A

B C

D E

F G

JANUARY FEBRUARY MARCH APRIL MAY JUNE JULY AUGUST SEPTEMBER OCTOBER NOVEMBER DECEMBER ANNUAL 31.0 34.3 36.3 39.9 40.3 40.7 39.6 40.7 40.7 44.3 41.2 36.1 38.8 2.2 3.7 5.4 5.2 4.4 5.6 5.8 5.0 5.0 4.3 1.8 1.6 4.2 2.2 3.6 4.1 4.2 4.1 4.7 4.5 4.4 4.2 3.9 2.2 1.8 3.7 4.5 5.4 6.1 7.3 7.1 7.9 7.9 7.2 6.6 6.3 4.5 4.6 6.3 47.0 42.5 37.5 33.0 33.3 30.9 31.5 30.8 31.8 32.1 38.5 44.0 36.1 26.5 23.3 23.7 22.6 26.2 27.3 29.4 32.5 30.9 24.1 26.8 27.1 26.7 11.5 11.9 11.9 13.2 16.8 17.6 16.5 17.0 17.4 20.9 15.4 13.6 15.3 6.1 9.5 11.3 14.5 8.1 5.9 4.6 3.0 4.0 8.5 10.8 7.3 7.8

METEOROLOGY 2.3-73 WATTS BAR WBNP-101 Table 2.3-43 Deleted By Amendment 63

2.3-74 METEOROLOGY WATTS BAR WBNP-101 Table 2.3-44 Inversion Persistence Data Watts Bar Nuclear Plant Jan 1, 74 - Dec 31, 93 (Delta-T Given In Degrees Celsius) (Page 1 of 2)

DISREGARDING INVERSION NO. HOURS E

0.0<DELTA-T<=1.5 F

1.5<DELTA-T<=4.0 G

DELT A-T>4.0 F AND G DELT A-T>1.5 STRENGTH DELTA-T>0.0 2

3 4

5 6

7 8

9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 2027 993 709 483 340 224 151 94 72 64 42 19 10 7

4 1

0 0

0 0

0 0

0 0

0 0

0 1091 728 597 530 513 399 291 220 164 132 60 31 17 3

1 0

0 1

0 0

0 0

0 0

0 0

0 527 337 302 286 189 159 103 118 89 87 53 40 34 6

2 0

0 0

0 0

0 0

0 0

0 0

0 377 309 312 286 305 299 307 350 399 477 414 357 213 168 50 8

1 2

1 1

0 0

0 0

0 0

0 842 549 393 349 314 271 277 270 298 419 773 731 595 468 272 98 25 8

0 1

0 0

0 0

0 0

0 29 30 31 32

>=32 0

0 0

0 0

0 0

0 0

0 0

0 0

0 0

0 0

0 0

0 0

0 0

0 2*

2.3-75 METEOROLOGY WATTS BAR WBNP-101 Meteorological Facility Located 0.8 Km SSW Of Watts Bar Nuclear Plant Temperature Instruments Located 45.63 And 9.51 Meters Above Ground

• January 1982 and December 1989 TOTAL 5420 4778 2332 4636 6955 Maximum Hours of Persistence 17 19 16 21 45 Table 2.3-44 Inversion Persistence Data Watts Bar Nuclear Plant Jan 1, 74 - Dec 31, 93 (Delta-T Given In Degrees Celsius) (Continued) (Page 2 of 2)

DISREGARDING INVERSION NO. HOURS E

0.0<DELTA-T<=1.5 F

1.5<DELTA-T<=4.0 G

DELT A-T>4.0 F AND G DELT A-T>1.5 STRENGTH DELTA-T>0.0

2.3-76 METEOROLOGY WATTS BAR WBNP-101 Table 2.3-45 Joint Percentage Frequencies Of Wind Speed By Wind Direction For Stability Class A (Delta T<=-1.9 C/100 M),

Watts Bar Nuclear Plant Jan 1, 74 - Dec 31, 93 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

NNE NE ENE E

ESE SE SSE S

SSW SW WSW W

WNW NW NNW SUBTOTAL 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 0.001 0.000 0.001 0.002 0.000 0.001 0.001 0.002 0.001 0.000 0.000 0.000 0.000 0.000 0.001 0.008 0.008 0.012 0.035 0.037 0.037 0.016 0.021 0.042 0.058 0.046 0.018 0.006 0.004 0.001 0.003 0.007 0.350 0.021 0.054 0.088 0.079 0.041 0.016 0.027 0.055 0.139 0.257 0.093 0.016 0.010 0.004 0.005 0.021 0.925 0.036 0.074 0.078 0.071 0.015 0.002 0.005 0.020 0.127 0.476 0.118 0.017 0.014 0.007 0.010 0.035 1.102 0.060 0.141 0.089 0.032 0.005 0.001 0.001 0.013 0.129 0.743 0.102 0.063 0.064 0.033 0.029 0.057 1.563 0.003 0.004 0.000 0.000 0.000 0.000 0.001 0.002 0.018 0.113 0.012 0.021 0.014 0.005 0.006 0.011 0.210 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.001 0.005 0.000 0.002 0.001 0.000 0.000 0.000 0.008 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 0.129 0.285 0.289 0.220 0.100 0.035 0.055 0.133 0.473 1.639 0.343 0.125 0.106 0.050 0.052 0.131 4.166 Total Hours Of Valid Stability Observations 167789 Total Hours Of Stability Class A 6970 Total Hours Of Valid Wind Direction-Wind Speed-Stability Class A 6849 Total Hours Of Valid Wind Direction-Wind Speed-Stability Observations 164406 Total Hours Calm Meteorological Facility: Watts Bar Nuclear Plant 1

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 = 7.21 Date Printed: 20-SEP-94 Note: Totals And Subtotals Are Obtained From Unrounded Numbers

METEOROLOGY 2.3-77 WATTS BAR WBNP-101 Table 2.3-46 Joint Percentage Frequencies Of Wind Speed By Wind Direction For Stability Class B (-1.9< Delta T<=-1.7 C/100 M),

Watts Bar Nuclear Plant Jan 1, 74 - Dec 31, 93 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

NNE NE ENE E

ESE SE SSE S

SSW SW WSW W

WNW NW NNW Subtotal 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 0.000 0.001 0.001 0.002 0.000 0.001 0.001 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.006 0.021 0.040 0.069 0.052 0.061 0.021 0.030 0.046 0.052 0.068 0.027 0.007 0.005 0.005 0.007 0.008 0.519 0.055 0.108 0.123 0.101 0.055 0.024 0.028 0.046 0.128 0.211 0.114 0.024 0.010 0.005 0.013 0.027 1.072 0.052 0.112 0.107 0.071 0.015 0.002 0.003 0.013 0.077 0.289 0.080 0.026 0.023 0.019 0.023 0.033 0.944 0.080 0.186 0.086 0.024 0.002 0.001 0.002 0.005 0.054 0.238 0.029 0.023 0.049 0.060 0.063 0.081 0.982 0.007 0.012 0.002 0.000 0.000 0.000 0.001 0.000 0.012 0.046 0.003 0.007 0.012 0.007 0.005 0.010 0.123 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.002 0.003 0.000 0.000 0.001 0.000 0.001 0.001 0.007 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 0.213 0.458 0.387 0.249 0.133 0.049 0.064 0.111 0.326 0.855 0.252 0.085 0.099 0.097 0.112 0.161 3.654 Total Hours Of Valid Stability Observations 167789 Total Hours Of Stability Class B 6109 Total Hours Of Valid Wind Direction-Wind Speed-Stability Class B 6007 Total Hours Of Valid Wind Direction-Wind Speed-Stability Observations Total Hours Calm 166406 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 = 6.38 Date Printed: 20-SEP-94 Note: Totals And Subtotals Are Obtained From Unrounded Numbers

2.3-78 METEOROLOGY WATTS BAR WBNP-101 Table 2.3-47 Joint Percentage Frequencies Of Wind Speed By Wind Direction For Stability Class C (-1.7< Delta T<=-1.5 C/100 M),

Watts Bar Nuclear Plant Jan 1, 74 - Dec 31, 93 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

NNE NE ENE E

ESE SE SSE S

SSW SW WSW W

WNW NW NNW Subtotal 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 0.002 0.001 0.004 0.002 0.001 0.001 0.001 0.001 0.001 0.001 0.001 0.000 0.000 0.000 0.015 0.041 0.099 0.130 0.117 0.101 0.041 0.055 0.085 0.116 0.099 0.049 0.021 0.018 0.011 0.020 0.024 1.027 0.099 0.205 0.234 0.172 0.126 0.040 0.056 0.109 0.245 0.418 0.193 0.057 0.027 0.022 0.040 0.056 2.097 0.117 0.221 0.163 0.082 0.022 0.004 0.008 0.029 0.114 0.375 0.103 0.037 0.050 0.038 0.051 0.081 1.494 0.154 0.292 0.128 0.027 0.005 0.000 0.001 0.012 0.068 0.268 0.036 0.023 0.060 0.113 0.144 0.129 1.460 0.008 0.019 0.001 0.001 0.001 0.000 0.002 0.004 0.017 0.062 0.007 0.009 0.011 0.018 0.015 0.011 0.184 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.001 0.004 0.000 0.000 0.002 0.000 0.001 0.000 0.009 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 0.419 0.837 0.658 0.400 0.258 0.088 0.123 0.238 0.561 1.227 0.388 0.148 0.169 0.201 0.270 0.301 6.286 Total Hours Of Valid Stability Observations 167789 Total Hours Of Stability Class C 10556 Total Hours Of Valid Wind Direction-Wind Speed-Stability Class C 10335 Total Hours Of Valid Wind Direction-Wind Speed-Stability Observations Total Hours Calm 164406 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 = 6.06 Date Printed: 20-SEP-94 Note: Totals And Subtotals Are Obtained From Unrounded Numbers

METEOROLOGY 2.3-79 WATTS BAR WBNP-101 Table 2.3-48 Joint Percentage Frequencies Of Wind Speed By Wind Direction For Stability Class D (-1.5< Delta T<=-0.5 C/100 M),

Watts Bar Nuclear Plant Jan 1, 74 - Dec 31, 93 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

NNE NE ENE E

ESE SE SSE S

SSW SW WSW W

WNW NW NNW SUBTOTAL 0.005 0.006 0.008 0.010 0.007 0.003 0.005 0.007 0.011 0.014 0.009 0.006 0.005 0.004 0.004 0.004 0.108 0.046 0.043 0.067 0.108 0.135 0.070 0.078 0.130 0.133 0.106 0.129 0.083 0.095 0.098 0.080 0.048 1.450 0.502 0.584 0.727 0.859 0.568 0.245 0.378 0.591 0.991 1.259 0.784 0.498 0.408 0.325 0.341 0.369 9.428 0.875 1.226 1.043 0.585 0.260 0.082 0.151 0.256 0.816 1.837 0.742 0.335 0.336 0.359 0.398 0.526 9.828 0.967 1.348 0.615 0.159 0.064 0.013 0.029 0.052 0.339 1.071 0.249 0.170 0.347 0.436 0.530 0.626 7.014 1.190 1.457 0.355 0.052 0.016 0.007 0.023 0.046 0.294 1.119 0.151 0.121 0.409 0.571 0.748 0.903 7.463 0.046 0.063 0.009 0.001 0.000 0.000 0.007 0.018 0.100 0.246 0.018 0.029 0.044 0.055 0.069 0.047 0.751 0.000 0.000 0.001 0.000 0.000 0.000 0.000 0.002 0.011 0.021 0.001 0.001 0.002 0.003 0.001 0.000 0.042 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.001 0.000 0.001 0.000 0.000 0.000 0.000 0.000 0.002 3.631 4.728 2.824 1.773 1.050 0.420 0.670 1.102 2.697 5.671 2.084 1.242 1.647 1.851 2.171 2.523 36.085 Total Hours Of Valid Stability Observations 167789 Total Hours Of Stability Class D 60302 Total Hours Of Valid Wind Direction-Wind Speed-Stability Class D 59326 Total Hours Of Valid Wind Direction-Wind Speed-Stability Observations Total Hours Calm 164406 177 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 = 5.37 Date Printed: 20-SEP-94 Note: Totals And Subtotals Are Obtained From Unrounded Numbers

2.3-80 METEOROLOGY WATTS BAR WBNP-101 Table 2.3-49 Joint Percentage Frequencies Of Wind Speed By Wind Direction For Stability Class E (-0.5< Delta T<= 1.5 C/100 M),

Watts Bar Nuclear Plant Jan 1, 74 - Dec 31, 93 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

NNE NE ENE E

ESE SE SSE S

SSW SW WSW W

WNW NW NNW SUBTOTAL 0.030 0.025 0.030 0.057 0.034 0.013 0.019 0.039 0.067 0.090 0.071 0.063 0.059 0.055 0.059 0.039 0.748 0.164 0.138 0.156 0.280 0.304 0.148 0.208 0.341 0.450 0.505 0.566 0.651 0.671 0.626 0.652 0.349 6.208 0.499 0.415 0.513 0.988 0.461 0.147 0.209 0.519 1.037 1.499 1.008 0.764 0.645 0.595 0.664 0.512 10.478 0.599 0.422 0.266 0.290 0.083 0.028 0.049 0.114 0.478 1.117 0.300 0.178 0.222 0.214 0.256 0.308 4.925 0.274 0.213 0.088 0.040 0.016 0.007 0.030 0.059 0.206 0.743 0.176 0.106 0.111 0.091 0.111 0.146 2.415 0.083 0.070 0.030 0.009 0.010 0.002 0.021 0.066 0.186 0.751 0.131 0.071 0.067 0.037 0.049 0.075 1.658 0.002 0.003 0.000 0.001 0.001 0.001 0.004 0.014 0.061 0.148 0.021 0.010 0.008 0.002 0.002 0.002 0.280 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.001 0.007 0.016 0.002 0.001 0.000 0.001 0.000 0.000 0.028 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 1.650 1.286 1.085 1.663 0.910 0.347 0.539 1.152 2.492 4.869 2.274 1.844 1.783 1.622 1.793 1.430 26.739 Total Hours Of Valid Stability Observations 167789 Total Hours Of Stability Class E 44969 Total Hours Of Valid Wind Direction-Wind Speed-Stability Class E 43961 Total Hours Of Valid Wind Direction-Wind Speed-Stability Observations Total Hours Calm 164406 1229 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 = 3.28 Date Printed: 20-SEP-94 Note: Totals And Subtotals Are Obtained From Unrounded Numbers

METEOROLOGY 2.3-81 WATTS BAR WBNP-101 Table 2.3-50 Joint Percentage Frequencies Of Wind Speed By Wind Direction For Stability Class F ( 1.5< Delta T<= 4.0 C/100 M),

Watts Bar Nuclear Plant Jan 1, 74 - Dec 31, 93 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

NNE NE ENE E

ESE SE SSE S

SSW SW WSW W

WNW NW NNW SUBTOTAL 0.051 0.043 0.054 0.087 0.046 0.016 0.023 0.042 0.061 0.078 0.096 0.126 0.131 0.126 0.184 0.099 1.262 0.288 0.229 0.246 0.345 0.286 0.120 0.159 0.254 0.338 0.387 0.517 0.738 0.884 0.937 1.225 0.644 7.598 0.245 0.219 0.318 0.567 0.200 0.048 0.082 0.189 0.304 0.435 0.498 0.588 0.499 0.393 0.707 0.398 5.688 0.027 0.027 0.025 0.058 0.010 0.001 0.005 0.018 0.040 0.175 0.064 0.038 0.028 0.024 0.041 0.030 0.609 0.006 0.001 0.002 0.002 0.001 0.000 0.001 0.002 0.005 0.063 0.018 0.007 0.001 0.002 0.004 0.004 0.119 0.001 0.001 0.001 0.002 0.001 0.000 0.000 0.002 0.004 0.013 0.005 0.001 0.001 0.001 0.002 0.000 0.035 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.001 0.000 0.000 0.000 0.001 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 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 0.617 0.519 0.645 1.062 0.544 0.185 0.270 0.508 0.751 1.151 1.199 1.497 1.544 1.483 2.163 1.175 15.311 Total Hours Of Valid Stability Observations 166789 Total Hours Of Stability Class F 25805 Total Hours Of Valid Wind Direction-Wind Speed-Stability Class F 25173 Total Hours Of Valid Wind Direction-Wind Speed-Stability Observations Total Hours Calm 164406 2075 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 = 1.53 Date Printed: 20-SEP-94 NOTE: Totals And Subtotals Are Obtained From Unrounded Numbers

2.3-82 METEOROLOGY WATTS BAR WBNP-101 Table 2.3-51 Joint Percentage Frequencies Of Wind Speed By Wind Direction For Stability Class G (Delta T > 4.0 C/100 M),

Watts Bar Nuclear Plant Jan 1, 74 - Dec 31, 93 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

NNE NE ENE E

ESE SE SSE S

SSW SW WSW W

WNW NW NNW SUBTOTAL 0.034 0.038 0.054 0.091 0.047 0.015 0.027 0.031 0.035 0.042 0.053 0.089 0.094 0.075 0.101 0.056 0.881 0.195 0.196 0.257 0.376 0.257 0.095 0.159 0.176 0.192 0.217 0.278 0.436 0.464 0.406 0.517 0.306 4.525 0.066 0.095 0.161 0.327 0.105 0.024 0.049 0.065 0.075 0.107 0.130 0.251 0.260 0.172 0.264 0.128 2.280 0.001 0.002 0.001 0.008 0.002 0.000 0.000 0.002 0.005 0.012 0.005 0.007 0.005 0.004 0.010 0.003 0.068 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.002 0.002 0.000 0.000 0.000 0.000 0.001 0.000 0.004 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 0.001 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 0.000 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 0.296 0.331 0.473 0.803 0.410 0.135 0.235 0.274 0.308 0.379 0.466 0.782 0.823 0.656 0.893 0.494 7.758 Total Hours Of Valid Stability Observations 167789 Total Hours Of Stability Class G 13078 Total Hours Of Valid Wind Direction-Wind Speed-Stability Class G 12755 Total Hours Of Valid Wind Direction-Wind Speed-Stability Observations Total Hours Calm 164406 1448 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 = 1.23 Date Printed: 20-SEP-94 NOTE: Totals And Subtotals AreObtained From Unrounded Numbers

METEOROLOGY 2.3-83 WATTS BAR WBNP-101 Table 2.3-52 Joint Percentage Frequencies Of Wind Speed By Stability Class, Watts Bar Nuclear Plant Jan 1, 74 - Dec 31, 93 WIND SPEED STABILITY CLASS (MPH)

A B

C D

E F

G 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 0.001 0.008 0.350 0.925 1.102 1.563 0.210 0.008 0.000 4.166 0.000 0.006 0.519 1.072 0.944 0.982 0.123 0.007 0.000 3.654 0.000 0.015 1.027 2.097 1.494 1.460 0.184 0.009 0.000 6.286 0.108 1.450 9.428 9.828 7.014 7.463 0.751 0.042 0.001 36.085 0.748 6.208 10.478 4.925 2.415 1.658 0.280 0.028 0.000 26.739 1.262 7.598 5.688 0.609 0.119 0.035 0.001 0.000 0.000 15.311 0.881 4.525 2.280 0.068 0.004 0.001 0.000 0.000 0.000 7.758 Total Hours Of Valid Stability Observations 167789 Total Hours Of Valid Wind Direction-Wind Speed-Stability Observations 164406 Total Hours Of Observations 175320 Joint Recoverability Percentage 93.8 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 Date Printed: 20-SEP-94

2.3-84 METEOROLOGY WATTS BAR WBNP-101 Table 2.3-53 Joint Percentage Frequencies Of Wind Speed By Wind Direction For Stability Class A (Delta T<=-1.9 C/100 M),

Watts Bar Nuclear Plant Jan 1, 77 - Dec 31, 93 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

NNE NE ENE E

ESE SE SSE S

SSW SW WSW W

WNW NW NNW SUBTOTAL 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 0.000 0.001 0.002 0.001 0.001 0.001 0.001 0.001 0.000 0.001 0.000 0.001 0.000 0.000 0.001 0.001 0.011 0.006 0.011 0.032 0.035 0.022 0.014 0.016 0.027 0.037 0.032 0.014 0.004 0.001 0.001 0.001 0.004 0.258 0.019 0.036 0.066 0.073 0.036 0.021 0.025 0.049 0.087 0.161 0.080 0.009 0.003 0.003 0.002 0.009 0.680 0.029 0.071 0.091 0.076 0.016 0.003 0.003 0.016 0.058 0.261 0.150 0.016 0.005 0.001 0.002 0.014 0.813 0.072 0.136 0.128 0.072 0.007 0.003 0.001 0.016 0.091 0.699 0.334 0.046 0.032 0.023 0.019 0.043 1.721 0.016 0.019 0.009 0.003 0.000 0.000 0.001 0.004 0.028 0.347 0.141 0.056 0.039 0.036 0.014 0.016 0.728 0.001 0.000 0.000 0.000 0.000 0.000 0.000 0.001 0.005 0.056 0.019 0.024 0.002 0.001 0.002 0.001 0.114 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.006 0.000 0.008 0.003 0.000 0.000 0.000 0.017 0.144 0.275 0.327 0.261 0.082 0.042 0.047 0.114 0.307 1.564 0.736 0.165 0.085 0.066 0.041 0.088 4.343 Total Hours Of Valid Stability Observations 144312 Total Hours Of Stability Class A 6198 Total Hours Of Valid Wind Direction-Wind Speed-Stability Class A 6089 Total Hours Of Valid Wind Direction-Wind Speed-Stability Observations Total Hours Calm 140205 2

Meteorological Facility: Watts Bar Nuclear Plant Stability Based On Delta-T Between 9.51 and 45.63 Meters Wind Speed And Direction Measured At 46.36 Meter Level Mean Wind Speed = 9.02 Date Printed: 29-NOV-94 NOTE: Total And Subtotals Are Obtained From Unrounded Numbers

METEOROLOGY 2.3-85 WATTS BAR WBNP-101 Table 2.3-54 Joint Percentage Frequencies Of Wind Speed By Wind Direction For Stability Class B (-1.9< Delta T<=-1.7 C/100 M), Watts Bar Nuclear Plant Jan 1, 77 - Dec 31, 93 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

NNE NE ENE E

ESE SE SSE S

SSW SW WSW W

WNW NW NNW SUBTOTAL 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 0.001 0.000 0.002 0.001 0.001 0.000 0.001 0.000 0.001 0.000 0.000 0.000 0.000 0.000 0.000 0.007 0.024 0.039 0.055 0.075 0.036 0.016 0.020 0.031 0.034 0.050 0.021 0.005 0.004 0.004 0.002 0.005 0.422 0.037 0.083 0.125 0.093 0.044 0.028 0.029 0.049 0.078 0.160 0.103 0.014 0.005 0.004 0.009 0.016 0.876 0.051 0.091 0.106 0.088 0.020 0.003 0.006 0.009 0.049 0.178 0.148 0.016 0.005 0.006 0.006 0.024 0.806 0.103 0.198 0.138 0.064 0.006 0.001 0.003 0.008 0.044 0.293 0.161 0.045 0.040 0.063 0.056 0.068 1.292 0.019 0.041 0.012 0.001 0.001 0.000 0.001 0.001 0.010 0.111 0.044 0.015 0.031 0.039 0.024 0.039 0.387 0.001 0.000 0.000 0.000 0.000 0.000 0.001 0.000 0.004 0.029 0.007 0.008 0.009 0.001 0.001 0.004 0.063 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.001 0.004 0.002 0.001 0.001 0.001 0.001 0.001 0.011 0.237 0.453 0.437 0.324 0.108 0.049 0.059 0.098 0.220 0.826 0.486 0.105 0.093 0.117 0.098 0.155 3.866 Total Hours Of Valid Stability Observations 144312 Total Hours Of Stability Class B 5522 Total Hours Of Valid Wind Direction-Wind Speed-Stability Class B 5420 Total Hours Of Valid Wind Direction-Wind Speed-Stability Observations Total Hours Calm 140205 1

Meteorological Facility: Watts Bar Nuclear Plant Stability Based On Delta-T Between 9.51 And 45.63 Meters Wind Speed And Direction Measured At 46.36 Meter Level Mean Wind Speed = 7.71 Date Printed: 29-NOV-94 Note: Totals And Subtotals Are Obtained From Unrounded Numbers

2.3-86 METEOROLOGY WATTS BAR WBNP-101 Table 2.3-55 Joint Percentage Frequencies Of Wind Speed By Wind Direction For Stability Class C (-1.7< Delta T<=-1.5 C/100 M), Watts Bar Nuclear Plant Jan 1, 77 - Dec 31, 93 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

NNE NE ENE E

ESE SE SSE S

SSW SW WSW W

WNW NW NNW SUBTOTAL 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 0.002 0.004 0.004 0.001 0.001 0.001 0.001 0.001 0.003 0.001 0.001 0.000 0.000 0.001 0.001 0.022 0.030 0.068 0.122 0.133 0.048 0.031 0.044 0.049 0.070 0.076 0.039 0.015 0.011 0.006 0.011 0.020 0.772 0.087 0.138 0.215 0.168 0.087 0.051 0.044 0.078 0.127 0.270 0.165 0.036 0.016 0.011 0.020 0.031 1.544 0.091 0.178 0.172 0.123 0.018 0.007 0.006 0.027 0.068 0.270 0.193 0.033 0.019 0.026 0.024 0.041 1.296 0.178 0.314 0.201 0.049 0.009 0.002 0.001 0.014 0.057 0.331 0.192 0.048 0.059 0.106 0.132 0.121 1.814 0.039 0.070 0.016 0.006 0.000 0.000 0.003 0.006 0.020 0.115 0.037 0.020 0.023 0.067 0.051 0.045 0.516 0.001 0.000 0.000 0.000 0.000 0.000 0.001 0.001 0.009 0.028 0.011 0.009 0.005 0.011 0.001 0.002 0.078 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.001 0.004 0.001 0.001 0.001 0.000 0.000 0.000 0.009 0.427 0.770 0.730 0.482 0.163 0.092 0.101 0.176 0.352 1.096 0.638 0.163 0.135 0.226 0.239 0.262 6.051 Total Hours Of Valid Stability Observations 144312 Total Hours Of Stability Class C 8714 Total Hours Of Valid Wind Direction-wind Speed-stability Class C 8484 Total Hours Of Valid Wind Direction-wind Speed-stability Observations Total Hours Calm 140205 1

Meteorological Facility: Watts Bar Nuclear Plant Stability Based On Delta-t Between 9.51 And 45.63 Meters Wind Speed And Direction Measured At 46.36 Meter Level Mean Wind Speed = 7.24 Date Printed: 29-NOV-94 Note: Totals And Subtotals Are Obtained From Unrounded Numbers

METEOROLOGY 2.3-87 WATTS BAR WBNP-101 Table 2.3-56 Joint Percentage Frequencies Of Wind Speed By Wind Direction For Stability Class D (-1.5< Delta T<=-0.5 C/100 M), Watts Bar Nuclear Plant Jan 1, 77 - Dec 31, 93 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

NNE NE ENE E

ESE SE SSE S

SSW SW WSW W

WNW NW NNW SUBTOTAL 0.006 0.008 0.012 0.012 0.008 0.004 0.004 0.007 0.010 0.014 0.009 0.006 0.005 0.004 0.004 0.004 0.116 0.047 0.068 0.101 0.116 0.102 0.058 0.059 0.086 0.085 0.083 0.063 0.061 0.068 0.052 0.054 0.039 1.144 0.324 0.435 0.718 0.660 0.402 0.213 0.240 0.393 0.588 0.824 0.558 0.361 0.233 0.185 0.230 0.226 6.589 0.516 0.852 1.040 0.569 0.215 0.107 0.150 0.247 0.553 1.378 0.880 0.331 0.194 0.188 0.215 0.306 7.742 0.633 1.134 0.901 0.310 0.104 0.021 0.038 0.068 0.271 1.026 0.622 0.210 0.188 0.257 0.356 0.383 6.522 1.831 1.933 0.962 0.164 0.043 0.013 0.037 0.066 0.285 1.387 0.745 0.302 0.484 0.867 0.964 1.080 11.162 0.384 0.294 0.088 0.012 0.004 0.002 0.008 0.039 0.133 0.718 0.238 0.118 0.198 0.277 0.279 0.335 3.128 0.009 0.007 0.001 0.000 0.000 0.000 0.004 0.009 0.044 0.145 0.038 0.020 0.030 0.017 0.020 0.012 0.356 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.006 0.016 0.009 0.006 0.002 0.000 0.001 0.000 0.039 3.749 4.731 3.822 1.843 0.878 0.419 0.539 0.914 1.976 5.590 3.162 1.416 1.402 1.847 2.123 2.385 36.798 Total Hours Of Valid Stability Observations 144312 Total Hours Of Stability Class D 52796 Total Hours Of Valid Wind Direction-Wind Speed-Stability Class D 51592 Total Hours Of Valid Wind Direction-Wind Speed-Stability Observations Total Hours Calm 140205 162 Meteorological Facility: Watts Bar Nuclear Plant Stability Based On Delta-T Between 9.51 And 45.63 Meters Wind Speed And Direction Measured At 46.36 Meter Level Mean Wind Speed = 6.93 Date Printed: 29-NOV-94 Note: Totals And Subtotals Are Obtained From Unrounded Numbers

2.3-88 METEOROLOGY WATTS BAR WBNP-101 Table 2.3-57 Joint Percentage Frequencies Of Wind Speed By Wind Direction For Stability Class E (-0.5< Delta T<= 1.5 C/100 M), Watts Bar Nuclear Plant Jan 1, 77 - Dec 31, 93 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

NNE NE ENE E

ESE SE SSE S

SSW SW WSW W

WNW NW NNW SUBTOTAL 0.030 0.051 0.070 0.054 0.031 0.017 0.017 0.032 0.058 0.080 0.044 0.025 0.020 0.016 0.018 0.018 0.581 0.168 0.242 0.336 0.336 0.270 0.157 0.133 0.205 0.275 0.303 0.205 0.168 0.124 0.121 0.121 0.118 3.281 0.363 0.655 0.893 0.622 0.281 0.137 0.166 0.359 0.749 1.108 0.575 0.277 0.220 0.170 0.203 0.196 6.976 0.275 0.561 0.540 0.216 0.082 0.056 0.062 0.155 0.509 1.282 0.538 0.225 0.127 0.135 0.138 0.149 5.049 0.415 0.436 0.273 0.070 0.034 0.019 0.037 0.073 0.311 1.081 0.439 0.159 0.133 0.123 0.205 0.183 3.992 0.595 0.337 0.123 0.039 0.021 0.006 0.046 0.120 0.340 1.430 0.729 0.255 0.211 0.160 0.205 0.223 4.840 0.019 0.007 0.004 0.003 0.003 0.000 0.012 0.049 0.126 0.575 0.223 0.083 0.037 0.016 0.019 0.023 1.198 0.000 0.000 0.000 0.000 0.000 0.001 0.003 0.008 0.032 0.099 0.026 0.010 0.004 0.001 0.001 0.000 0.184 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.006 0.003 0.003 0.001 0.000 0.000 0.000 0.000 0.012 1.865 2.288 2.239 1.339 0.722 0.393 0.476 1.002 2.406 5.961 2.782 1.202 0.875 0.741 0.910 0.910 26.112 Total Hours Of Valid Stability Observations 144312 Total Hours Of Stability Class E 37823 Total Hours Of Valid Wind Direction-Wind Speed-Stability Class E 36611 Total Hours Of Valid Wind Direction-Wind Speed-Stability Observations Total Hours Calm 140205 814 Meteorological Facility: Watts Bar Nuclear Plant Stability Based On Delta-T Between 9.51 And 45.63 Meters Wind Speed And Direction Measured At 46.36 Meter Level Mean Wind Speed = 5.17 Date Printed: 29-NOV-94 Note: Totals And Subtotals Are Obtained From Unrounded Numbers

METEOROLOGY 2.3-89 WATTS BAR WBNP-101 Table 2.3-58 Joint Percentage Frequencies Of Wind Speed By Wind Direction For Stability Class F (1.5< Delta T<= 4.0 C/100 M), Watts Bar Nuclear Plant Jan 1, 77 - Dec 31, 93 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

NNE NE ENE E

ESE SE SSE S

SSW SW WSW W

WNW NW NNW SUBTOTAL 0.057 0.110 0.147 0.105 0.049 0.023 0.026 0.050 0.094 0.111 0.066 0.037 0.033 0.026 0.028 0.033 0.997 0.223 0.314 0.469 0.377 0.291 0.151 0.150 0.206 0.297 0.270 0.240 0.153 0.168 0.150 0.132 0.155 3.749 0.333 0.757 0.964 0.645 0.190 0.072 0.106 0.278 0.617 0.814 0.405 0.205 0.155 0.106 0.136 0.165 5.950 0.142 0.388 0.293 0.071 0.010 0.008 0.018 0.061 0.254 0.689 0.208 0.079 0.049 0.046 0.060 0.066 2.442 0.086 0.147 0.059 0.006 0.003 0.002 0.009 0.016 0.086 0.450 0.130 0.056 0.032 0.025 0.038 0.053 1.198 0.032 0.031 0.010 0.001 0.002 0.000 0.004 0.016 0.046 0.334 0.173 0.056 0.019 0.015 0.018 0.020 0.777 0.001 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.001 0.029 0.027 0.004 0.001 0.000 0.001 0.001 0.066 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.001 0.000 0.001 0.001 0.000 0.000 0.000 0.000 0.003 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 0.875 1.747 1.943 1.207 0.546 0.256 0.314 0.626 1.397 2.698 1.251 0.591 0.458 0.369 0.412 0.493 15.182 Total Hours Of Valid Stability Observations 144312 Total Hours Of Stability Class F 22122 Total Hours Of Valid Wind Direction-Wind Speed-Stability Class F 21286 Total Hours Of Valid Wind Direction-Wind Speed-Stability Observations Total Hours Calm 140205 1398 Meteorological Facility: Watts Bar Nuclear Plant Stability Based On Delta-T Between 9.51 And 45.63 Meters Wind Speed And Direction Measured At 46.36 Meter Level Mean Wind Speed = 2.91 Note: Totals and Subtotals are Obtained from Unrounded Numbers Date Printed: 29-NOV-94

2.3-90 METEOROLOGY WATTS BAR WBNP-101 Table 2.3-59 Joint Percentage Frequencies Of Wind Speed By Wind Direction For Stability Class G (Delta T > 4.0 C/100 M) Watts, Bar Nuclear Plant Jan 1, 77 - Dec 31, 93 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

NNE NE ENE E

ESE SE SSE S

SSW SW WSW W

WNW NW NNW SUBTOTAL 0.023 0.041 0.063 0.043 0.014 0.006 0.007 0.018 0.033 0.032 0.018 0.012 0.011 0.010 0.011 0.012 0.353 0.123 0.185 0.238 0.179 0.109 0.051 0.046 0.081 0.113 0.092 0.081 0.065 0.068 0.070 0.082 0.073 1.655 0.205 0.415 0.674 0.439 0.087 0.038 0.049 0.175 0.367 0.376 0.175 0.113 0.091 0.069 0.080 0.096 3.449 0.087 0.195 0.208 0.053 0.004 0.006 0.005 0.035 0.178 0.424 0.108 0.044 0.027 0.027 0.041 0.041 1.484 0.017 0.066 0.034 0.001 0.000 0.000 0.003 0.009 0.043 0.218 0.046 0.023 0.016 0.010 0.015 0.018 0.517 0.009 0.009 0.004 0.001 0.001 0.000 0.001 0.003 0.011 0.091 0.034 0.009 0.008 0.004 0.004 0.001 0.188 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.002 0.001 0.000 0.000 0.000 0.000 0.000 0.003 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 0.465 0.912 1.220 0.715 0.215 0.101 0.111 0.319 0.745 1.235 0.463 0.265 0.220 0.189 0.233 0.240 7.648 Total Hours Of Valid Stability Observations 144312 Total Hours Of Stability Class G 11137 Total Hours Of Valid Wind Direction-Wind Speed-Stability Class G 10723 Total Hours Of Valid Wind Direction-Wind Speed-Stability Observations Total Hours Calm 140205 495 Meteorological Facility: Watts Bar Nuclear Plant Stability Based On Delta-T Between 9.51 And 45.63 Meters Wind Speed And Direction Measured At 46.36 Meter Level Mean Wind Speed = 2.78 Date Printed: 29-NOV-94 Note: Totals And Subtotals Are Obtained From Unrounded Numbers

METEOROLOGY 2.3-91 WATTS BAR WBNP-101 Table 2.3-60 Joint Percentage Frequencies Of Wind Speed By Stability Class, Watts Bar Nuclear Plant Jan 1, 77 - Dec 31, 93 Wind Speed Stability Class (MPH)

A B

C D

E F

G 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 0.001 0.011 0.258 0.680 0.813 1.721 0.728 0.114 0.017 4.343 0.001 0.007 0.422 0.876 0.806 1.292 0.387 0.063 0.011 3.866 0.001 0.022 0.772 1.544 1.296 1.814 0.516 0.078 0.009 6.051 0.116 1.144 6.589 7.742 6.522 11.162 3.128 0.356 0.039 36.798 0.581 3.281 6.976 5.049 3.992 4.840 1.198 0.184 0.012 26.112 0.997 3.749 5.950 2.442 1.198 0.777 0.066 0.003 0.000 15.182 0.353 1.655 3.449 1.484 0.517 0.188 0.003 0.000 0.000 7.648 Total Hours Of Valid Stability Observations 144312 Total Hours Of Valid Wind Direction-Wind Speed-Stability Observations 140205 Total Hours Of Observations 149016 Joint Recoverability Percentage 94.1 Meteorological Facility: Watts Bar Nuclear Plant Stability Based On t Between 9.51 And 45.63 Meters Wind Speed And Direction Measured At 46.36 Meter Level Date Printed: 29-NOV-94

2.3-92 METEOROLOGY WATTS BAR WBNP-101 Meteorological facility located 0.8 km SSW of reactor site. Temperature instruments 9.51 and 45.63 meters above ground. Wind speed and direction measured at 9.72-meter level. Joint percent valid data in data base = 93.4.

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

Table 2.3-61 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 (Sheet 1 of 1)

Based on RG 1.145 and Meteorological Data for 1974 Through 1988*

Plume Sector Direction 0.5th Percentile X/Q Value (sec/m3) 5th Percentile X/Q Value (sec/m3)

N 3.312E-4 3.396E-5 NNE 3.341E-4 4.596E-5 NE 3.954E-4 3.314E-5 ENE 5.060E-4 2.883E-5 E

5.293E-4 3.177E-5 ESE 5.321E-4 2.721E-5 SE 6.040E-4 5.996E-5 SSE 4.705E-4 2.622E-5 S

3.068E-4 2.662E-5 SSW 2.901E-4 2.806E-5 SW 3.441E-4 1.791E-5 WSW 4.394E-4 3.217E-5 W

3.704E-4 WNW 1.322E-4 NW 2.242E-4 NNW 3.154E-4 All Directions Combined 1.217E-3 5.323E-4

METEOROLOGY 2.3-93 WATTS BAR WBNP-101

• Meteorological facility located 0.8 km SSW of reactor site. Temperature instruments 9.51 and 45.63 meters above ground. Wind speed and direction measured at 9.72-meter level. Joint percent valid data in data base = 93.7.

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

Table 2.3-61a 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 (Sheet 1 of 1)

Based On Rg 1.145 And Meteorological Data For 1974 Through 1993*

Plume Sector Direction 0.5th Percentile X/Q Value (sec/m3) 5th Percentile X/Q Value (sec/m3)

N 3.674E-4 3.550E-5 NNE 3.808E-4 5.036E-5 NE 4.597E-4 3.990E-5 ENE 5.305E-4 3.181E-5 E

5.297E-4 2.989E-5 ESE 5.089E-4 2.572E-5 SE 6.069E-4 4.769E-5 SSE 4.645E-4 2.375E-5 S

3.452E-4 2.598E-5 SSW 3.171E-4 2.721E-5 SW 3.703E-4 2.376E-5 WSW 4.728E-4 3.286E-5 W

3.701E-4 WNW 1.452E-4 NW 2.357E-4 NNW 3.239E-4 All Directions Combined 9.297E-3 5.263E-5

2.3-94 METEOROLOGY WATTS BAR WBNP-101

• Meteorological facility located 0.8 km SSW of reactor site. Temperature instruments 9.51 and 45.63 meters above ground. Wind speed and direction measured at 9.72-meter level. Joint percent valid data in data base = 93.4.

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

Table 2.3-62 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 R.G. 1.145 and Meteorological Data for 1974 Through 1988*

Plume Sector Direction 0.5th Percentile x/Q Value (sec/m3) 5th Percentile x/Q Value (sec/m3)

Annual Average x/Q Value (sec/m3)

N 7.665E-5 4.828E-6 7.054E-7 NNE 7.799E-5 8.040E-6 1.150E-6 NE 9.809E-5 4.720E-6 1.225E-6 ENE 1.298E-4 3.714E-6 1.282E-6 E

1.348E-4 4.333E-6 1.391E-6 ESE 1.331E-4 3.357E-6 1.533E-6 SE 1.445E-4 1.060E-5 1.467E-6 SSE 1.183E-4 3.148E-6 9.964E-7 S

7.146E-5 3.246E-6 7.454E-7 SSW 6.759E-5 3.542E-6 7.091E-7 SW 8.790E-5 1.467E-6 8.111E-7 WSW 1.206E-4 4.466E-6 9.701E-7 W

9.350E-5 4.400E-7 WNW 2.284E-5 2.335E-7 NW 4.944E-5 2.507E-7 NNW 7.223E-5 3.935E-7 All Directions Combined 2.717E-4 1.352E-4

METEOROLOGY 2.3-95 WATTS BAR WBNP-101

• Meteorological facility located 0.8 km SSW of reactor site. Temperature instruments 9.51 and 45.63 meters above ground. Wind speed and direction measured at 9.72-meter level. Joint percent valid data in data base = 93.7.

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

Table 2.3-62a 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 R.G. 1.145 and Meteorological Data for 1974 Through 1993*

Plume Sector Direction 0.5th Percentile X/Q Value (sec/m3) 5th Percentile X/Q Value (sec/m3)

Annual Average X/Q Value (sec/m3)

N 0.798E-4 5.094E-6 0.842E-6 NNE 0.845E-4 8.854E-6 1.386E-6 NE 1.135E-4 5.827E-6 1.639E-6 ENE 1.338E-4 4.514E-6 1.561E-6 E

1.365E-4 4.128E-6 1.600E-6 ESE 1.305E-4 3.181E-6 1.655E-6 SE 1.411E-4 7.997E-6 1.526E-6 SSE 1.161E-4 2.853E-6 1.035E-6 S

0.772E-4 3.211E-6 0.881E-6 SSW 0.731E-4 3.444E-6 0.814E-6 SW 0.930E-4 2.451E-6 1.001E-6 WSW 1.239E-4 4.608E-6 1.212E-6 W

0.897E-4 0.469E-6 WNW 0.265E-4 0.263E-6 NW 0.502E-4 0.272E-6 NNW 0.691E-4 0.416E-6 All Directions Combined 2.797E-4 1.349E-4

2.3-96 METEOROLOGY WATTS BAR WBNP-101 1-hour and annual average X/Qs calculated from meteorological data for 1974 through 1988.

Meteorological facility located 0.8 km SSW of reactor site. Temperature instruments 9.51 and 45.63 meters above ground. Wind speed and direction measured at 9.72-meter level. Joint percent valid data in data base = 93.4.

Table 2.3-63 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 2.3-62)*

Averaging Period 5th Percentile X/Q Value (sec/m3) 8-hour 6.447E-5 16-hour 4.452E-5 3-day 1.993E-5 26-day 6.288E-6

METEOROLOGY 2.3-97 WATTS BAR WBNP-101 1-hour and annual average X/Qs calculated from meteorological data for 1974 through 1993.

Meteorological facility located 0.8 km SSW of reactor site. Temperature instruments 9.51 and 45.63 meters above ground. Wind speed and direction measured at 9.72-meter level. Joint percent valid data in data base = 93.7.

Table 2.3-63a 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 RG 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 (from Table 2.3-62a)*

Averaging Period 5th Percentile X/Q Value (sec/m3) 8-hour 6.516E-5 16-hour 4.529E-5 3-day 2.057E-5 26-day 6.621E-6

2.3-98 METEOROLOGY WATTS BAR WBNP-101 1-hour and annual average X/Qs calculated from meteorological data for 1974 through 1988.

Meteorological facility located 0.8 km SSW of reactor site. Temperature instruments 9.51 and 45.63 meters above ground. Wind speed and direction measured at 9.72-meter level. Joint percent valid data in data base = 93.4.

Table 2.3-64 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.*

Sector-Specific X/Q Values (sec/m3)

Plume Sector 8-hour 16-hour 3-day 26-day N

3.531E-5 2.396E-5 1.034E-5 3.090E-6 NNE 3.884E-5 2.741E-5 1.286E-5 4.342E-6 NE 4.752E-5 3.308E-5 1.507E-5 4.874E-6 ENE 6.049E-5 4.130E-5 1.804E-5 5.492E-6 E

6.328E-5 4.336E-5 1.909E-5 5.877E-6 ESE 6.363E-5 4.399E-5 1.975E-5 6.257E-6 SE 6.765E-5 4.629E-5 2.032E-5 6.230E-6 SSE 5.370E-5 3.618E-5 1.536E-5 4.488E-6 S

3.361E-5 2.305E-5 1.017E-5 3.139E-6 SSW 3.182E-5 2.183E-5 9.639E-6 2.980E-6 SW 4.051E-5 2.750E-5 1.187E-5 3.550E-6 WSW 5.433E-5 3.647E-5 1.535E-5 4.433E-6 W

3.855E-5 2.475E-5 9.465E-6 2.381E-6 WNW 1.071E-5 7.329E-6 3.221E-6 9.895E-7 NW 2.064E-5 1.333E-5 5.167E-6 1.325E-6 NNW 3.051E-5 1.983E-S 7.784E-6 2.033E-6

METEOROLOGY 2.3-99 WATTS BAR WBNP-101 1-hour and annual average X/Qs calculated from meteorological data for 1974 through 1993.

Meteorological facility located 0.8 km SSW of reactor site. Temperature instruments 9.51 and 45.63 meters above ground. Wind speed and direction measured at 9.72-meter level. Joint percent valid data in data base = 93.7.

Table 2.3-65 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 RG 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.*

Sector-Specific X/Q Values (sec/m3)

Plume Sector 8-hour 16-hour 3-day 26-day N

3.760E-5 2.581E-5 1.141E-5 3.534E-6 NNE 4.281E-5 3.048E-5 1.458E-5 5.060E-6 NE 5.631E-5 3.967E-5 1.855E-5 6.228E-6 ENE 6.412E-5 4.438E-5 1.997E-5 6.347E-6 E

6.545E-5 4.532E-5 2.041E-5 6.494E-6 ESE 6.340E-5 4.418E-5 2.018E-5 6.553E-6 SE 6.677E-5 4.592E-5 2.039E-5 6.353E-6 SSE 5.319E-5 3.601E-5 1.544E-5 4.579E-6 S

3.683E-5 2.545E-5 1.141E-5 3.606E-6 SSW 3.475E-5 2.396E-5 1.070E-5 3.359E-6 SW 4.397E-5 3.023E-5 1.341E-5 4.174E-6 WSW 5.765E-5 3.933E-5 1.715E-5 5.208E-6 W

3.763E-5 2.438E-5 0.950E-5 2.458E-6 WNW 1.234E-5 0.843E-5 0.369E-5 1.124E-6 NW 2.116E-5 1.375E-5 0.539E-5 1.406E-6 NNW 2.969E-5 1.946E-5 0.777E-5 2.084E-6

2.3-100 METEOROLOGY WATTS BAR WBNP-101 a Hourly 10-m wind and 10- and 46-m temperature data. Meteorological facility located 0.8 km SSW of reactor site.

b Calms assigned a wind speed of 0.3 mph.

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

d Actual 2-hour and 6-hour X/Q averaging periods were used.

e Calms assigned a wind speed of 0.6 mph.

Table 2.3-66 Atmospheric Dispersion Factors (X/q), Sec/m3, For Design Basis Accident Analyses Based On Onsite Meteorological Data For Watts Bar Nuclear Planta (Sheet 1 of 1)

A.

Regulatory Guide 1.4 Results in original FSAR (5th percentile values) for July 1973 Through June 1975 Data.b Period (hours)

Minimum Distance to Exclusion Boundary (1100 m)c Low Population Zone (4828 m) 0-2 0.692E-3d 0.160E-3d 2-8 0.844E-4d 8-24 0.854E-5 24-96 0.455E-5 96-720 0.198E-5 B.

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 1974 through 1988 Datae.

Period (1100 m)c (4828 m) 0-2 0.604E-3 0.145E-3 2-8 0.677E-4 8-24 0.463E-4 24-96 0.203E-4 96-720 0.623E-5

METEOROLOGY 2.3-101 WATTS BAR WBNP-101

1. Hourly 10-m wind and 10 and 46-meter temperature data. Meteorological facility located 0.8 km SSW of reactor site.

2. Calms assigned a wind speed of 0.3 mph.

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

4. Actual 2-hour and 6-hour X/Q averaging periods were used.

5. Calms assigned a wind speed of 0.6 mph.

Table 2.3-66a Atmospheric Dispersion Factors (X/q), Sec/m3, For Design Basis Accident Analyses Based On Onsite Meteorological Data For Watts Bar Nuclear Plant1 A.

Regulatory Guide 1.4 Results in original FSAR (5th percentile values) for July 1973 Through June 1975 Data.2 Period (hours)

Minimum Distance to Exclusion Boundary (1100 m)3 Low Population Zone (4828 m) 0-2 0.692E-34 0.160E-34 2-8 0.844E-44 8-24 0.854E-5 24-96 0.455E-5 96-720 0.198E-5 B.

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 1974 through 1993 Data5.

Period (hours)

Minimum Distance to Exclusion Boundary (1100 m)3 Low Population Zone (4828 m) 0-2 0.607E-3 0.141E-3 2-8 0.668E-4 8-24 0.459E-4 24-96 0.204E-4 96-720 0.635E-5

2.3-102 METEOROLOGY WATTS BAR WBNP-101 NOTE: The calculations for the 2-year data base were slightly conservative in comparison to those for the 15-year data base. The 2-year values were computed in 1976 with the speed assigned to calm hours assumed to be 0.3 mph. The 15-year values were computed in 1989 with the speed assigned to calms assumed to be 0.6 mph, which is the starting threshold for the anemometer.

• Meteorological facility located 0.8 km SSW of reactor site.

Table 2.3-67 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 A.

July 1973 through June 1975 Wind Speed and Direction Data Plume Sectors Averaging Periods (degrees) 1-hour 8-hour 16-hour 3-day 26-day 89.75-157.25 1.59 0.834 0.670 0.447 0.348 132.25-199.75 1.61 0.864 0.688 0.496 0.361 154.75-222.25 1.44 0.743 0.598 0.441 0.300 192.25-259.75 1.33 0.719 0.601 0.437 0.302 B.

January 1974 through December 1988 Wind Speed and Direction Data Plume Sectors Averaging Periods (degrees) 1-hour 8-hour 16-hour 3-day 26-day 89.75-157.25 1.82 1.04 0.852 0.593 0.463 132.25-199.75 1.27 0.760 0.626 0.440 0.316 154.75-222.25 0.866 0.574 0.497 0.360 0.264 192.25-259.75 1.04 0.653 0.576 0.416 0.266

METEOROLOGY 2.3-103 WATTS BAR WBNP-101 NOTE: The 2-year values were computed in 1976 with the speed assigned to calm hours assumed to be 0.3 mph. The 20-year values were computed in 1994 with the speed assigned to calms assumed to be 0.6 mph, which is the starting threshold for the anemometer.

• Meteorological facility located 0.8 km SSW of reactor site.

Table 2.3-67a 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 A.

July 1973 through June 1975 Wind Speed and Direction Data Plume Sectors Averaging Periods (degrees) 1-hour 8-hour 16-hour 3-day 26-day 89.75-157.25 1.59 0.834 0.670 0.447 0.348 132.25-199.75 1.61 0.864 0.688 0.496 0.361 154.75-222.25 1.44 0.743 0.598 0.441 0.300 192.25-259.75 1.33 0.719 0.601 0.437 0.302 B.

January 1974 through December 1993 Wind Speed and Direction Data Plume Sectors Averaging Periods (degrees) 1-hour 8-hour 16-hour 3-day 26-day 89.75-157.25 1.97 1.04 0.862 0.607 0.456 132.25-199.75 1.29 0.784 0.626 0.434 0.312 154.75-222.25 0.891 0.606 0.516 0.368 0.255 192.25-259.75 1.10 0.713 0.610 0.435 0.300

2.3-104 METEOROLOGY WATTS BAR WBNP-101 THIS PAGE INTENTIONALLY LEFT BLANK