ML20065Q622

Radiological Impact Assessment Rept Sequoyah Nuclear Plant Jan-Dec 1993

ML20065Q622
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Site:	Sequoyah
Issue date:	12/31/1993
From:	TENNESSEE VALLEY AUTHORITY
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l TENNESSEE VALLEY AUTHORITY RADIOLOGICAL IMPACT ASSESSMENT REPORT )

SEQUOYAH NUCLEAR PLANT l

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JANUARY THROUGH DECEMBER 1993 9405040234 94042s PDR R ADOCK 05000327 PDR

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l i i RadiologieriImpact AszmmInt l Sequoyah Nuclear Plant l January - December 1993

1. lNIBODUCTION Potential doses to maximum individuals and the population around Sequoyah are calculated for each quarter as required in Section 5.2 of the Offsite Dose Calculation Manual (ODCM).

Measured plant releases for the reporting period are used to estimate these doses. Dispersion of radioactive effluents in the environment is estimated using meteorological data and riverflow  ;

data measured during the period. In this report, the doses resulting from releases are described  !

and compared to limits established for Sequoyah. l

11. DOSE LIMITS The ODCM specifies limits for the release of radioactive s..'ffluents, as well as limits for doses to the general public from the release of radioactive effluents. These limits are set well below the NRC 10 CFR Part 20 limits which govern the concentrations of radioactivity and exposures permissible ir, unrestricted areas. This ensures that radioactive effluent releases are As Low As Reasonably Achievable. ,

The limits for doses in an unrestricted area from airborne noble gases releases are:

! Less than or equal to 5 mrad per quarter and l

10 mrad per year (per reactor unit) for gamma radiation,

- and - l l Less than or equal to 10 mrad per quarter and 20 mrad per year (per reactor unit) for beta radiation.

The limit for the dose to a member of the general public at in an unrestricted area from iodines and particulates released in airborne effluents is:

Less than or equal to 7.5 mrem per quarter and 15 mrem per year (per reactor unit) to any organ.

The limit for doses to a member of the general public frcm radioactive material in liquid effluents released to unrestricted areas, is: l Less than or equal to 1.5 mrem per quarter and 3 mrem per year (per reactor unit) to the total body,

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I Less than or equal to 5 mrem per quarter and i 10 mrem per year (per reactor unit) to any organ l

The EPA limits for total dose to the public in the vicinity of a nuclear power plant, established in j the Environmental Dose Standard of 40 CFR 190, are: 1 Less than or equal to 25 mrem per year to the total body, Less than or equal to 75 mrem per year to the thyroid,

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l Less than or equal to 25 mrem per year to any other organ.

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Radiologicallmpact Assessment I Sequoyah Nuclear Plant l January - December 1993 1 lit, DOSE CALCULATIONS j Estimated doses to the pub!ic are determined using computer models (the Gaseous Effluent  :

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

" maximum exposed individual." Some of the factors used in these calculations (such as I ingestion rates) are maximum values. Many of these factors are obtained from NUREG/CR-1004. The values chosen will tend to overestimate the dose to this " maximum" person. The l expected dose to actualindividuals is lower. The calculated doses are presented in Tables 1 through 9.

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IV.QQSES FROM AIRBORNE EFFLUENTS For airborne effluents, the public can be exposed to radiation from several sources: direct radiation from the radioactivity in the air, direct radiation from radioactivity deposited on the ground, inhalation of airbome radioactivity, ingestion of vegetation which contains radioactivity deposited from the atmosphere, and ingestion of milk and beef which contains radioactivity deposited from the atmosphere onto vegetation which is then eaten by milk and beef animals. i f

Airbome Release Points All releases from Sequoyah are considered ground-level releases. The ground-level Joint Frequency Distribution (JFD) is derived from windspeeds and directions measured 10 meters above ground and from the vertical temperature difference between 10 and 46 meters, and is presented in Tables 10,11,12, and 13.

Meteorological Date Meteorological variables at Sequoyah are measured continuously. Measurements collected include wind speed, wind direction, and temperature at heights of 10,46 and 91 meters above the ground. Quarterly joint frequency distributions (JFDs) are calculated for each release point using the appropriate levels of meteorological data. A joint frequency distribution gives the percentage of the time in a quarter that the wind is blowing out of a particular upwind compass sector in a particular range of wind speeds for a given stability class A through G. The wind speeds are divided into nine wind speed ranges. Calms are distributed by direction in proportion to the distribution of noncalm wind directions less than 0.7 m/s (1.5 mph). Stability classes are determined from the vertical temperature difference between two measurement levels.

Extemal Exoosure Dg_ge Dose estimates for maximum external air exposures (gamma-air and beta-air doses) are made for points at and beyond the unrestricted area boundary as described in the SON ODCM.

Bybmersion Dose External doses to the skin and total body, due to submersion in a cloud of noble gases, are estimated for the nearest residence in each sector.

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Radiologicalimpact Assessment Sequoyah Nuclear Plant l January - December 1993

.Q1gmtDose Doses to organs due to releases of airborne effluents are estimated for the inhalation, ground contamination, and ingestion pathways. The ingestion pathway is fu:ther divided into four possible contributing pathways' ingestion of cow / goal milk, ingestion of beef, and ingestion of vegetables. Doses from applicable pathways are calculated for each real receptor location identified in the most recent land use survey. To determine the maximum organ dose, the doses j from the pathways are summed for each receptor. For the ingestion dose, however, only those pathways that exist for each receptor are considered in the sum, i.e., milk ingestion doses are included only for locations where milk is consumed without commercial preparation and vegetable ingestion is included only for those locations where a garden is identified. To

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1 conservatively account for beef ingestion, a beef ingestion dose equal to that for the highest site  !

i boundary location is added to each identified receptor For ground contamination, the dose added to the organ dose being calculated is the total body dose calculated for that location, i.e., j it is assumed that the dose to an individual organ is equal to the total body dose.

Doses from airborne effluents are presented in Tables 1,2,3, and 4.

V, DOSES FROM LIQUID EFFLUENTS For liquid effluents, the public can be exposed to radiation from three sources: the ingestion of water from the Tennessee River, the ingestion of fish caught in the Tennessee River, and direct exposure from radioactive material deposited on the river shoreline sediment (recreation).

The concentrations of radioactivity in the Tennessee River are estimated by a computer model which uses measured hydraulic data downstream of Sequoyah. Parameters used to determine the doses are based on guidance given by the NRC (in Regulatory Guides 1.109) for maximum ingestion rates, exposure times, etc. Wherever possible, parameters used in the dose calculation are site specific use factors determined by TVA. The models that are used to estimate doses, as well as the parameters input to the models, are described in detail in the Sequoyah Nuclear Plant ODCM.

Liquid Release Points and River Data Radioactivity concentrations in the Tennessee River are calculated assuming that releases in liquid effluents are continuous. All routine liquid releases from Sequoyah, located at Tennessee River Mile 484, are made through diffusers which extend into the Tennessee River. It is assumed that releases to the river through these diffusers willinitially be entrained in six tenths of the water which flows past the plant. The QWATA code makes the assumption that this mixing condition holds true until the water is completely mixed at the first downstream dam, at Tennessee River Mile 471.0.

Doses are calculated for locations between the plant site and the mouth of the Tennessee River.

The maximum potential recreation dose is calculated for a location immediately downstream from the plant outfall. The maximum individual dose from ingestion of fish is assumed to be that ,

calculated for the consumption of fish caught anywhere between the plant and the first I downstream dam (Chickamauga Dam). The maximum individual dose from drinking water is assumed to be that calculated at the nearest downstream public water supply (E.1. DuPont).

This could be interpreted as indicating that the maximum individual, as assumed for liquid releases from Sequoyah, is an individual who obtains all of his dnnking water at E. l. DuPont, consumes fish caught , rom the Tennessee River between SON and Chickamauga Dam, and spends 500 hours0.00579 days <br />0.139 hours <br />8.267196e-4 weeks <br />1.9025e-4 months <br /> per year on the shoreline just below the outfall from Sequoyah. Dose l

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RadiologicalImpact AzosegmInt Sequoyah Nuclear Plant January - December 1993 estimates for the maximum individual due to liquid effluents for each quarte in the period are presented in Tables 5,6,7, and 8, along with the average river flows past the plant site for the periods.

VI. POPULATIQ1LD_QSES Population doses for highest exposed organ due to airborne effluents are calculated for an estimated 1,060,000 persons living within a 50-mile radius of the plant site. Ingestion population doses are calculated assuming that each individual consumes milk, vegetables, and meat produced with the sector annulus in which he/she resides. Doses from external pathways and inhalation are based on the 50-mile human population distribution.

Population doses for total body and the maximum exposed organ due to 'aquid influents are calculated for the entire downstream Tennessee River Population. Water ingestion population doses are calculated using actual population figures for downstream public water supplies. Fish ingestion population doses are calculated assuming that all sport fish caught in the Tennessee River are consumed by the Tennessee River population. Recreation population doses are calculated using actual recreational data on the number of shoreline visits at downstream locations.

Population dose estimates for airborne and liquid effluents are presented in Tables 1 through 8.

RadigingicalImpact Assis2 mint Sequoyah Nuclear Plant January - December 1993 Vll. DIRECT RADIATION External gamma radiation levels were measured by thermoluminescent dosimeters (TLDs) deployed around SON. The quarterly gamma radiation levels determined from these TLDs for the period of November 1992 to November 1993 showed that external gamma radiation levels averaged approximately 15.4 mR/ quarter at onsita stations and approximately 13.8 mR/ quarter at offsite stations, or approximately 1.6 mR/quartar higher onsite than at offsite stations. This is consistent with levels reported at TVA's non operating nuclear power plant construction sites where the average radiation levels onsite are ger:erally 2-6 mR/ quarter higher than the levels offsite. This may be attributable to natural variations in environmental radiation levels, earth moving activities onsite, the mass of concrete employed in the construction of the plants, or other undetermined influences. Fluctuations in natural background dose rates and in TLD readings toad to mask any small increments which may be due to plant operations. Thus, there was no identifiable increase in dose rate levels attributable to direct radiation from plant equipment and/or gaseous effluents.

Vill. QQSE TO MEMBERS OF THE PUBLIC INSIDE THE SITE BOUNDARY No routine activities within the site boundary by members of the public have been identified which would lead to their radiation exposure.

IX. TOTAL DOSE To determine compliance with 40 CFR 190, annual total dose contributions to the maximum individual from SON radioactive effluents and all other nearby uranium fuel cycle sources are considered.

The annual dose to any organ other than thyroid for the maximum individualis conservatively estimated by summing the following doses: the total body air submersion dose for each quarter, the critical organ dose (for any organ other than the thyroid) from airborne effluents for each quarter from ground contamination, inhalation and ingestion, the total body dose from liquid effluents for each quarter, the maximum organ dose (for any organ other than the thyroid) from liquid effluents for each quarter, and any identifiable increase in direct radiation dose levels as measured by the environmental monitoring program. This dose is compared to the 40 CFR 190 limit for total body or any organ dose (other than thyroid) to determine compliance.

The annual thyroid dose to the maximum individualis conservatively estimated by summing the following doses: the total body air submersion dose for each quarter, the thyroid dose from airborne effluents for each quarter, the total body dose from liquid effluents for each quarter, the thyroid dose from liquid effluents for each quarter, and any identifiable increase in direct radiation dose levels as measured by the environmental monitoring program. This dose is compared to the 40 CFR 190 limit for thyroid dose to determine compliance.

Cumulative annual total doses are presented in Table 9.

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R:dislogicalImpact A:ssesment Sequoyah Nuclear Plant January - December 1993 Table 1 Doses from Airborne Effluents First Quarter Individual Doses

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Pathway Dose Quarterly Limit Percent of Limit Location (mrad)

External Gamma Air 5.44E-03 5 mrad <1 % SSW 1840 meters Beta Air 1.06E-02 10 mrad <1 % SSW 1840 meters Submersion Total Body 4.63E-03 10 mrad <1 % SSW 2591 meters Skin 9.72E-03 10 mrad <1 % SSW 2591 meters Organ Doses Child / Thyroid 2.57E-02 7.5 mrad <1 % SSW 2591 meters Child / Thyroid 2.57E-02 7.5 mrad <1 % SSW 2591 meters Child / Total Body 2.57E-02 7.5 mrad <1 % SSW 2591 meters j Populallan Doses Total Body Dose 2.09E-01 man-rem l

l Maximum Organ Dose (organ) 2.09E-01 man-rem (thyroid)

Population doses can be compared to ti,e natural background dose for the entire 50-mile population of about 95,400 person-rem / year (based on 90 mrem &r for natural background).

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L Radi:logicalimpact A ssesment j Sequoyah Nuclear Plant January - December 1993 Table 2 Doses from Airborne Effluents Second Quarter l Individual Doses Pathway Dose Quarterly Limit Percent of Limit 1.ocation 3 (mrad)

.; External i Gamma Air 6.52E-03 5 mrad <1 % N 950 meters Beta Air 2.17E-03 10 mrad <1 % N 950 meters 4

! Submersion Total Body 1.08E-03 10 mrad <1 % NNW 895 meters Skin 2.59E-03 10 mrad <1 % NNW 895 meters

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Organ Doses j Child / Thyroid 1.26E-03 7.5 mrad <1 % SSW 2591 meters Child / Thyroid 1.26E-03 7.5 mrad <1 % SSW 2591 meters Child / Total Body 1.26E-03 7.5 mrad <1 % SSW 2591 meters j Pooulation Doses Total Body Dose 1.69E-02 man-rem Maximum Organ Dose (organ) 1.69E-02 man-rem (thyroid) l l Population doses can be compared to the natural background dose for the entire 50-mile population of about 95,400 person-rem / year (based on 90 mrem /yr for natural background).

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l Radiologicalimpact A:ssesmint Sequoyah Nuclear Plant January - December 1993 Table 3 Doses from Airborne Effluents Third Quarter Individual Doses Pathway Dose Quarterly Limit Percent of Limit Location (mrad)

External Gamma Air 0.0 5 mrad 0% N/A I Beta Air 0.0 10 mrad 0% N/A Submersion l Total Body 0.0 10 mrad 0% N/A

! Skin 0.0 10 mrad 0% N/A l

Organ Doses Child /GI Tract 5.53E-03 7.5 mrad <1 % NNW 991 meters -

Child / Thyroid 5.50E-03 7.5 mrad <1 % NNW 991 meters Child / Total Body 5.50E-03 7.5 mrad <1 % NNW 991 meters l

Pooulation Dongs l Total Body Dose 4.17E-02 man-rem Maximum Organ we (organ) 4.17E-02 man-rem (Gl Tract)  ;

1 Population doses can be compared to the natural background dose for the entire 50-mile ,

population of about 95,400 person-rem / year (based on 90 mremlyr for natural background).

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RadiclogicalImpact As:scem:nt Sequoyah Nuclear Plant January - December 1993 Table 4 Doses from Airborne Effluents Fourth Quarter Individual Doses Pathway Dose Quarterly Limit Percent of Limit Location (mrad) g External e G3mma Air 1.46E-04 5 mrad <1 % N 950 meters Beta Air 1.64 E-04 10 mrad <1 % N 950 meters Submersion Total Body 6.72E-05 10 mrad <1 % SSW 2591 meters Skin 1.20E-04 10 mrad <1 % SSW 2591 meters -

Organ Doses Child / Thyroid 1.76E-05 7.5 mrad <1 % SSW 2591 meters Child / Thyroid 1.76E-05 7.5 mrad <1 % SSW 2591 meters Child / Total Body 1.76E-05 7.5 mrad <1 % SSW 2591 meters Egpglal[gn Doses Total Body Dose 3.34E-04 man-rem Maximum Organ Dose (organ) 3.34E-04 man-rem (thyroid)

Population doses can be compared to the natural background dose for the entire 50-mile population of about 95,400 person-remhear (based on 90 mremfyr for natural background).

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s RadiologicalImpact A221simsnt Sequoyah Nuclear Plant January - December 1993 Table 5 Doses from Liquid Effluents First Quarter Individual Doses (rem)

Age Group Organ Dose Pathway Dose Quarterly Percent of (mrem) Limit Limit Adult Total Body Water ingestion 5.9E-04  !

Fish Ingestion 5.0E-03 Recreation 3.5E-04 Total 5.9E-03 1.5 mrem <1% j l

Adult Liver Water Ingestion 6.1 E-04 Fish Ingestion 6.9E-03 l Recreation 3.5E-04 Total 7,9E-03 5 mrem <1%

Child Thyroid Water Ingestion 7.7E-04 I Fish Ingestion 5.6E-05 Recreation 3.5E-04 Total 1.2E-03 5 mrem <1%

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l Average Riverflow past SON (cubic feet per second): 52,933 1

Population Doses Total Body Dose 8.4E-02 man-rem Maximum Organ Dose (organ) 9.3E-02 man-rem (liver) l Population doses can be compared to the natural background dose for the entire 50-mile l population of about 95,400 man-rem / year (based on 90 miem/yr for natural background).

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RidinlogicalImpact Azzstamsnt Sequoyah Nuclear Plant ,

January - December 1993 Table 6 Doses from Liquid Effluents 4 Second Quarter Individual Doses (rem)

Age Group Organ Dose Pathway Dose Quarterly Percent of (mrem) Limit Limit Adult Total Body Water Ingestion 5.4 E-04 Fish Ingestion 2.4 E-02

{ Recreation 3.0E-03 Total 2.8E-02 1.5 mrem 1.9%

i Teen Liver Water Ingestion 5.3E-04

Fish Ingestion 3.5E-02 4

Recreation 3.0E-03 Total 3.9E-02 5 mrem <1%

j Child Thyroid Water Ingestion 3.5E-04

, Fish Ingestion 1.7E-05 Recreation 3.0E-03 Total 3.4E-03 5 mrem <1%

Average Riverflow past SON (cubic feet per second): 24,987 I

Population Doses Total Body Dose 3.0E-01 man-rem j Maximum Organ Dose (organ) 3.4E-01 man-rem (liver)

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

] population of about 95,400 man-rem / year (based on 90 mremlyr for natural background).

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l l RadirlsgicIlImpict Asesormant l Sequoyah Nuclear Plant l January - December 1993 l

l l Table 7 Doses from Liquid Effluents Third Quarter ladividual Doses frem)

Age Group Organ Dose Pathway Dose Quarterly Percent of (mrem) Limit Limit Adult Total Body Water Ingestion 5.1 E-04 Fish Ingestion 2.5E-02 Recreation 3.6E-03 Total 2.9E-02 1.5 mrem 1.9%

Teen Liver Water Ingestion 5.2 E-04 Fish Ingestion 3.6E-02 Recreation 3.6E-03 Total 4.0E-02 5 mrem <1%

Child Thyroid Water Ingestion 2.8E-04 Fish Ingestion 5.9E-06 Recreation 3.6E-03 Total 3.9E-03 5 mrem <1%

Average Riverflow past SON (cubic feet per second): 25,441 Eooulation Doses Total Body Dose 4.3E-01 man-rem Maximum Organ Dose (organ) 4.8E--01 man-rem (liver)

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

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, Radi:I:gicalImpact A32sesmint Sequoyah Nuclear Plant January - December 1993

, Table 8 Doses from L! quid Effluents l Fourth Quarter Individual Doses fram)

Age Group Organ Dose Pathway Dose Quarterly Percent of Limit Limit Adult Total Body Water Ingestion 3.1 E-04

. Fish Ingestion 3.0E-03 Recreation 3.3E-03 Total 6.6E-03 1.5 mrem <1%

' l Liver Water Ingestion 2.4 E-04 Teen Fish Ingestion 4.3E-03 Recreation 3.3E-03 j Total 7.8E-03 5 mrem <1%  ;

s Child Thyroid Water ingestion 3.6E-04 Fish Ingestion 1.5E-05 Recreation 3.3E-03 Total 3.7E-03 5 mrem <1%

Average Riverflow past SON (cubic feet per second): 27,468 Eggulation Doses

! Total Body Dose 1.9E-01 man-rem 4

Maximum Organ Dose (organ) 2.0E-01 man-rem (liver)

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

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R:dialogicalimp:ct AssIssm;nt Sequoyah Nuclear Plant January - December 1993 I

Tablo 9 Total Dose from Fuel Cycle Dose First Second Third Fourth Quader Quader Quader Quader i Total Body or any Organ l (except thyroid) i Total body air submersion 4.63E-03 1.08E-03 0.0 6.72E-05 l i

Critical organ dose (air) 2.57E-02 1.26E-03 5.53E-03 1.76E-05 Total body dose (liquia) 5.9 E-03 2.8E-02 2.9E-02 6.6E-03 J Maximum organ dose (liquid) 7.9E-03 3.9E-02 4.0E-02 7.8E-03 i

Direct Radiation Dose 0.0 0.0 0.0 0.0 Total 4.4 E-02 6.9E-02 7.5E-02 1.4 E-02 l Cumulative Total Dose (Total body or any other organ) mrem 2.0E-01 ,

1 Annual Dose Limit (mrem) 2.50E+01 l

! Percent of Limit <1%

Thyroid Dose (mrem)

Total body air submersion 4.63E-03 1.08E-03 0.0 6.72E-05 Thyroid dose (airborne) 2.57E-02 1.26E-03 5.5E-03 1.76E-05 Total body dose (liquid) 5.9E-03 2.8E-02 2.9E-02 6.6E-03 Thyroid dose (liquid) 1.2E-03 3.4 E-03 3.9E-03 3.7E-03 Direct Radiation Dose 0.0 0.0 0.0 0.0 Total 3.7E-02 3.4E-02 3.8 E-02 1.0E-02 i Cumulative Total Dose

! (Thyroid) mrem 1.2E-01 Annual Dose Limit (mrem) 7.50E+01 Percent of Limit <1%

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s l Radiol gicallmpact Assr02 mint l Sequoyah Nuclear Plant i

January - December 1993 l l

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l Table 10 Joint Frequency Distribution in Percent I for Ground Level Releases l First Quarter i

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JOINT PERCENTAGE FREQUENCIES OF WZND SPEED BT WIND DIRECTION FOR ,

j STABILITY CLASS A (DELTA T(=-1.9 C/100 M)

SEQUOYAH NUCLEAR PLANT '

'JAN 1, 93 - MAR 31 93 WIND WIND SPEED (MPH) i DIRECTION CALM 0.6-1.4 1.5-3.4 3.5-5.4 5.5-7.4 7.5-12.4 12.5-18.4 18.5-24.4 >=24.5 TOTAL N 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 NNE 0 . 0 .' O.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0  ;

NE 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0  ;

ENE' O.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 E 0.0 l 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 ESE 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 SE 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 SSE {

0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 S 0.0 0.0 0.0 00 0.0 0.0 0.0 0.0 0.0 0.0 SSW 0.0 0.0 0.0 {

0.0 0.058 0.0 0.0 0.0 0.0 0.058 i

, SW 0.0 0.0 0.0 0.0 0.058 0.115 0.0 0.0 0.0 0.173 i WSW 0.0 0.0 0.0 0.0 0.0 0.230 0.0 0.0 0.0 0.230 l

'W 0.0 0.0 0.0 0.0 0.0 0.0 0.058 0.0 0.G 0.058 WNW 0.0  !

0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 NW 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 '

NNW 0.0 0.0 0.0 0.0 0.058 0.115 0.0' O.0 0.0 0.173 SUBTOTAL 0.0 0.0 0.0 0.0 0.173 0.460 0.058 0.0 0.0 0.690  ;

! TOTAL HOURS OF VALID-STABILITY OBSERVATIONS- 1786

] TOTAL HOURS OF STABILITY CLASS A 13

' TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS A 12 i TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 1738 '

TOTAL HOURS CALM 0 l s l

METEOROLOGICAL FACILITY: SEQUOYAH NUCL*AR PLANT

. STABILITY BASED ON LAPSE RATE MEASURED BETWEEN 9.25 AND 45.99 METERS i WIND SPEED AND DIRECTION MEASURED AT THE 9.73 METER LEVEL l

i LATE PRINTED: 04/29/93 ,

$ MEAN WIND SPEED = 9.5 MPN NOTE: TOTALS AND SUBTOTALS ABOVE ARE OBTAINED FROM UNROUNDED NUMBERS I h

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F JOINT PERCENTAGE FREOUENCIES OF WIND SPEED BY WIND D2RECTION FOR _ !

4 STABILITY CLASS B (-1.9< DELTA-T(=-1.7 C/100 M)

• i SEQUOYAN NUCLEAR PLANT JAN 1, 93 - MAR 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 0.0 0.0 0.0 0.0 0.058 0.058 0.0 0.0 0.0 0.115 NNE 0.0 0.0 0.058 0.0 0.0 0.230 0.0 0.0 0.0 0.288

• 0.0 0.0 0.0 0.0 '

NE ., 0.0 0.0 0.0 0.0 0.0 0.0 ENE 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 E 0.0 0.0 0.0 0.058 0.0 0.0 0.0 0.0 0.0 0.058 ESE 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 '

SE 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 SSE 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0

• S 0.0 0.0 0.0 0.0 0.0 0.4' O.0_ 0.0 0.0 0.0  ;

SSW 0.0' O.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 k SW 0.0 0.0 0.0 0.0 0.058 0.0 0.0 0.0 0.0 0.058  !

WSW 0.0 0.0 0.0 0.0 0.0 0.125 0.058 0.0 0.0 0.173 r W 0.0 0.0 0.0 0.0 0.0 0.115 0.0 0.0 0.0 0.115 i WNW 0.0 0.0 0.0 0.0 0.058 0.058 0.0 0.0 0.0 0.115 NW 0.0 0.0 0.0 0.0 0.058 0.058 0.0 0.0 0.0 0.115 <

NNW 0.0 0.0' O.0 0.0 0.058 0.173 0.0 0.0 0.0 0.230 4

SU8 TOTAL 0.0 0.0 0.058 0.058 0.288 0.806 0.058 0.0 0.0 1.266

.I TOTAL HOURS OF VALID STABILITY OBSERVATIONS 1786' TOTAL HOURS OF STABILITY CLASS B 24 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS B 22 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 1738 TOTAL HOURS CALM 0 t

METEOROLOGICAL FACILITY: SEQUOYAN NUCLEAR PLANT STABILITY BASED ON LAPSE RATE MEASURED BETWEEN 9.25 AND 45.99 METERS WIND SPEED AND DIRECTION MEASURED AT THE 9.73 METER LEVEL T

DATE PRINTED: 04/29/93 ,

i MEAN WIND SPEED = 8.3 MPH i

NOTE: TOTALS AND SUBTOTALS ABOVE ARE OBTAINED FROM UNROUNDED NUMBERS 4

i 4

,_-_-__ _ . - _ _ _ - - - _ - ~ v ~

JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR -

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

SEQUOY)H NUCLEAR PLANT JAN 1, 93 - MAR 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 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 NNE 0.0 0.0 0.0 0.115 0.058 0.173 0.0 0.0 0.0 0.345 NE 0.0 0,0 0.0 0.058 0.345 0.0 0.0 0.0 0.0 0.403 ENE 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 E 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 ESE 0.6 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 SE 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 SSE 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 5 0.0 0.0 0.0 0.058 0.0 0.0 0.0 0.0 0.0 0.058 SSW 0.0 0.0 0.0 0.0 0.173 0.058 0.0 0.0 0.0 0.230 SW 0.0 0.0 0.0 0.0 0.058 0.0 0.0 0.0 0.0 0.058 WSW 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 W 0.0 0.0 0.0 0.0 0.0 0.058 0.0 0.0 0.0 0.058 WNW 0.0 0.0 0.0 0.0 0.058 0.058 0.0 0.0 0.0 0.115 NW 0.0 0.0 0.0 0.0 0.115 0.058 0.0 0.0 0.0 0.173 NNW 0.0 0.0 0.0 0.058 0.058 0.115 0.0 0.0 0.0 0.230 SUBTOTJr. 0.0 0.0 0.0 0.288 0.863 0.518 0.0 0.0 0.0 1.669 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 1786 TOTAL HOURS OF STABILITT CLASS C 31 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITT CLASS C 29 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITT OBSERVATIONS 1738 TOTAL HOURS CALM 0 METEOROLOGICAL FACILITT: SEQUOTAH NUCLEAR PLANT STABILITY BASED ON LAPSE RATE MEASURED BETWEEN 9.25 AND 45.99 METERS WIND SPEED AND DIRECTION MEASURED AT THE 9.73 METER LEVEL DATE PRINTED: 04/29/93 MEAN WIND SPEED = 7.0 MPH NOTE: TOTALS AND SUBTOTALS ABOVE ARE OBTAINED FROM UNROUNDED NUMBERS

JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR ,

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

-SEQUOYAH NUCLEAR PLANT JAN 1, 93 - MAR 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 0.039 0.345 0.748 1.841 1.669 1.036 0.115 0.0 0.0 5.793 NNE 0.070 0.173 1.784 4.661 2.877 3.049 0.0 0.0 0.0 12.613 NE 0.039 0.230 0.863 0.921 0.403 0.345 0.0 0.0 0.0 2.801 ENE 0.023 0.173 0.460 0.115 0.0 0.0 0.0 0.0 0.0 0.771 ~

E 0.012 0.115 0.230 0.058 0.0 0.0 0.0 0.0 0.0 0.415 i ESE 0.002 0.058 0.0 0.115 0.0 0.0 0.0 0.0 0.0 0.175 SE 0.010 0.058 0.230 0.115 0.0 0.0 0.0 0.0 0.0 0.413 SSE 0.018 0.058 0.460 0.288 0.0 0.115 0.0 0.0 0.0 0.939

. S 0.033 0.173 0.748 0.518 0.345 0.0 0.0 0.0 0.0 1.817 i SSW 0.084 0.230 2.129 2.014 1.151 0.345 0.0 0.0 0.0 5.953 SW. 0.037 0.173 0.863 1.266 0.518 0.173 0.0 0.0 0.0 3.029 i

WSW- 0.006 0.0 0.173 0.460 0.288 0.345 0.0 0.0 0.0 1.272 W 0.004 0.058 0.058 0.345 0.748 0.633 0.0 0.0 0.0 1.845

, WNW 0.0 0.0 0.0 0.403 0.633 0.058 0.0 0.0 0.0 1.093 KW 0.008 0.058 0.173 0.403 0.690 0.058 0. 0 . 0.0 0.0 1.389 NNW 0.016 0.115 0.345 0.921 1.381 0.230 0.0 0.0 0.0 3.008 l SUBTOTAL 0.403 2.014 9.264 14.442 10.702 6.387 0.115 0.0 0.0 43.326 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 1786 TOTAL HOURS OF STABILITY CLASS D 763 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS D 753

, TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 1738 i

TOTAL HOURS CALM 7 t

i METEOROLOGICAL FACILITY: SEQUOYAH NUCLEAR PLANT

• STABILITY BASED ON LAPSE RATE MEASURED BETWEEN 9.25 AND 45.99 METERS WIND SPEED AND DIRECTION MEASURED AT THE 9.73 METER LEVEL DATE PRINTED: 04/29/93 MEAN WIND SPEED = 5.0 MPH i i NOTE: TOTALS AND SUBTOTALS ABOVE ARE OBTAINED FROM UNROUNDED NUMBERS i

a E

N r

t m . . . _ . , . _ ,

JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BT WIND DIRECTION F02 -

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

SEQUOYAH NUCLEAR PLANT JAN 1, 93 - MAR 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 M 0.413 0.690 3.280 1.554 0.806 0.115 0.115 0.0 0.0 6.973 NNE 0.389 0.978 2.762 2.877 0.921 0.460 0.0 0.0 0.0 8.387 NE 0.072 0.345 0.345 0.058 0.058 0.058 0.0 0.0 0.0 0.935 ENE 0.012 0.115 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.127 E 0.006 0.058 0.0 0.058 0.0 0.0 0.0 0.0 0.0 0.121 ESE 0.018 0.058 0.115 0.0 0.0 0.0 0.0 0.0 0.0 0.191 SE 0.012 0.115 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.127 SSE 0.042 0.288 0.115 0.058 0.0 0.0 0.0 0.0 0.0 0.502 S 0.084 0.288 0.518 0.460 0.345 0.115 0.0 0.0 0.0 1.810 SSW 0.222 0.173 1.956 1.784 0.978 0.230 0.058 0.0 0.0 5.400 SW 0.228 0.575 1.611 1.784 1.093 0.288 0.0 0.0 0.0 5.579 WSW 0.048 0.115 0.345 0.230 0.345 0.288 0.0 0.0 0.0 1.371 W 0.048 0.0 0.460 0.575 0.288 0.0 0.0 0.0 0.0 1.371 WNW 0.072 0.173 0.518 0.173 0.173 0.0 0.0 0.0 0.0 1.108 NW 0.090 0.230 0.633 0.460 0.173 0.115 0.0 0.0 0.0 1.701 NNW 0.144 0.460 0.921 0.978 0.288 0.115 0.0 0.0 0.0 2.906 SUBTOTAL 1.899 4.661 13.579 11.047 5.466 1.784 0.173 0.0 0.0 38.607 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 1786 TOTAL HOURS OF STABILITY CLASS E 685 TOTAL HOURS OF YALID WIND DIRECTION-WIND SPEED-STABILITY CLASS E 671 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 1738 TOTAL HOURS CALM 33 METEOROLOGICAL FACILITY: SEQUOYAH NUCLEAR PLANT STABILITY BASED ON LAPSE RATE MEASURED BETWEEN 9.25 AND 45.99 METERS WIND SPEED AND DIRECTION MEASURED AT THE 9.73 METER LEVEL DATE PRINTED: 04/29/93 MEAN WIND SPEED = 3.6 MPH NOTE: TOTALS AND SUBTOTALS ABOVE ARE OBTAINED FROM UNROUNDED NUMBERS

JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTIO7 FOS ,

STABILITY CLASS F ( 1.5< DELTA-T(= 4.0 C/100 M)

SEQUOYAH NUCLEAR PLANT JAN 1, 93 - MAR 31, 93 WIND WIND SPEED (MPH)

DIRECTION CALM 0.6-1.4 1.5-3.4 3.5-5.4 5.5-7.4 1.5-12.4 12.5-18.4 18.5-24.4 >=24.5 TOTAL N 0.109 0.173 0.633 0.173 0.0 0.0 0.0 0.0 0.0 1.087 NME 0.281 0.518 1.554 0.288 0.0 0.0 0.0 0.0 0.0 2.640 NE 0.062 0.173 0.288 0.0 0.0 0.0 0.0 0.0 0.0 0.523 ENE 0.016 0.058 0.058 0.0 0.0 0.0 0.0 0.0 0.0 0.131 E 0.008 0.058 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.065 ESE 0.008 0.058 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.065 SE 0.008 0.058 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.065 SSE 0.008 0.058 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.065 5 0.070 0.0 0.518 0.0 0.0 0.0 0.0 0.0 0.0 0.588 SSW 0.148 0.115 0.978 n,058 0.0 0.0 0.0 0.0 0.0 1.299 SW 0.101 0.230 0.518 0.173 0.115 0.058 0.0 0.0 0.0 1.195 WSW 0.008 0.058 0.0 0.0 0.058 0.0 0.0 0.0 0.0 0.123 W 0.023 0.058 0.115 0.0 0.0 0.0 0.0 0.0 0.0 0.196 WNW 0.023 0.058 0.115 0.0 0.0 0.0 0.0 0.0 0.0 0.196 NW 0.008 0.0 0.058 0.0 0.0 0.0 0.0 0.0 0.0 0.065 NNW 0.039 0.0 0.288 0.0 0.0 0.0 0.0 0.0 0.0 0.327 SUBTOTAL 0.921 1.669 5.121 0.690 0.173 0.058 0.0 0.0 0.0 8.631 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 1786 TOTAL HOURS OF STABILITY CLASS F 157 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS F 150 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 1738 TOTAL HOURS CALM 16 METEOROLOGICAL FACILITY: SEQUOYAH NUCLEAR PLANT STABILITY BASED ON LAPSE RATE MEASURED BETWEEN 9.25 AND 45.99 METERS WIND SPEED AND DIRECTION MEASURED AT THE 9.73 METER LEVEL DATE PRINTED: 04/29/93 MEAN WIND SPEED = 2.1 MPH NOTE: TOTALS AND SUBTOTALS ABOVE ARE OBTAINED FROM UNROUNDED NUMBERS

JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR ,

STABILITY CLASS G (DELTA T > 4.0 C/100 M)

SEQUOYAH NUCLEAR PLANT JAN 1, 93 - MAR 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 0.034 0.0 0.173 0.0 0.0 0.0 0.0 0.0 0.0 0.206 NNE 0.438 0.345 1.899 0.058 0.0 0.0 0.0 0.0 0.0 2.739 NE 0.180 0.460 0.460 0.0 0.0 0.0 0.0 0.0 0.0 1.100 ENE 0.034 0.115 0.058 0.0 0.0 0.0 0.0 0.0 0.0 0.206 E 0.011 0.058 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.069 ESE 0.045 0.230 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.275 SE 0.011 0.058 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.069 SSE 0.011 0.058 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.069 s 0.056 0.230 0.058 0.0 0.0 0.0 0.0 0.0 0.0 0.344 SSW 0.079 0.173 0.230 0.058 0.0 0.0 0.0 0.0 0.0 0.539 SW 0.011 0.0 0.058 0.058 0.0 0.0 0.0 0.0 0.0 0.126 WSW 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 W 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 WNW 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 NW 0.011 0.0 0.058 0.0 0.0 0.0 0.0 0.0 0.0 0.069 NNW 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 SUBTOTAL 0.921 1.726 2.992 0.173 0.0 0.0 0.0 0.0 0.0 5.811 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 1786 TOTAL HOURS OF STABILITY CLASS G 113 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STASILITY CLASS G 101 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 1738 TOTAL HOURS CALM 16 METEOROLOGICAL FACILITY: SEQUOTAH NUCLEAR PLANT STABILITY BASED ON LAPSE RATE MEASURED BETWEEN 9.25 AND 45.99 METERS WIND SPEED AND DIRECTION MEASURED AT THE 9.73 METER LEVEL DATE PRINTED: 04/29/93 MEAN WIND SPEED = 1.6 MPH NOTE: TCTALS AND SUBTOTALS ABOVE ARE OBTAINED FROM UNROUNDED NUMBERS

1 Radiologic:llmpact A xsim:nt  ;

Sequoyah Nuclear Plant  !

January - December 1993 l

l 4

Table 11 Joint Frequency Distribution in Percent for Ground Level Releases Second Quarter l

4 l

l l

l

e W

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

SEQUOYAH NUCLEAR PLANT APR 1, 93 - JUN 30, 93 WIND WIND SPEED (MPH)

DIRECTION CA LM 0.6-1.4 1.5-3.4 3.5-5.4 5.5-7.4 7.5-12.4 12.5-18.4 18.5-24.4 >=24.5 TOTAL N 0.000 0.000 0.000 0.000 0.000 0.145 0.000 0.000 0.000 0.145 NME 0.000 0.000 0.048 0.386 0.145 0.097 0.000 0.000 0.000 0.676 NE 0.000 0.000 0.048 0.242 0.000 0.000 ENE 0.000 0.000 0.000 0.290 0.000 0.000 0.097 0.048 0.000 0.000 0.000 E

0.000 0.000 0.145 0.000 0.000 0.097 0.000 0.000 0.000 0.000 ESE 0.000 0.000 0.000 0.097 0.000 0.097 0.000 0.000 0.000 0.000 SE 0.000 0.000 0.000 0.097 0.000 0.000 0.048 0.000 0.048 0.000 0.000 SSE 0.000 0.000 0.000 0.097 0.000 0.000 0.000 0.000 0.000 0.000 S 0.000 0.000 0.000 0.000 0.048 0.048 0.097 0.000 0.000 0.000 SSW 0.000 0.000 0.000 0.193 0.000 0.097 0.097 0.290 0.000 0.000 SW 0.000 0.000 0.000 0.483 0.000 0.338 0.338 0.000 0.000 0.000 0.000 WSW 0.000 0.000 0.000 0.676 0.000 0.048 0.000 0.000 0.000 0.000 0.048 W 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 WNW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 NW 1.000 0.000 0.000 0.000 0.000 0.048 0.048 0.000 0.000 0.000 NRW .000 0.000 0.000 0.000 0.097 0.000 0.145 0.000 0.000 0.000 0.145 SUBTOTAL 0.000 0.000 0.435 1.208 0.773 0.773 0.000 0.000 0.000 3.188 TOTAL MOURS OF VALID STABILITY OBSERVATIONS 2120 TOTAL HOURS OF STABILITY CLASS A 67 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS A 66 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITT OBSERVATIONS 2070 TOTAL HOURS CALM 0 METEOROLOGICAL FACILITY: SEQUOTAH NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 9.25 AND 45.99 METERS WIND SPEED AND DIRECTION MEASURED AT 9.73 METER LEVEL DATE PRINTED: 2-AUG-93 MEAN WIND SPEED = 6.07 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS

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

SEQUOYAH NUCLEAR PLANT APR 1, 93 - JUN 30, 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 0.000 0.000 0.000 f.048 0.048 0.145 0.000 0.000 0.000 0.242 NNE 0.000 0.000 0.145 C.242 0.048 0.097 0.000 0.000 0.000 0.531 NE 0.000 0.000 0.193 C.000 0.048 0.000 0.000 0.000 0.000 0.242 ENE 0.000 0.000 0.097 0.000 0.000 0.000 0.000 0.000 0.000 0.097 E 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 ESE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 SE 0.000 0.000 0.048 0.000 0.000 0.000 0.000 0.000 0.000 0.048 SSE 0.000 0.000 0.000 0.000 0.000 0.048 0.000 0.000 0.000 0.048 S 0.000 0.000 0.000 0.048 0.048 0.048 0.000 0.000 0.000 0.145 SSW 0.000 0.000 0.048 0.338 0.386 0.193 0.000 0.000 0.000 0.966 SW 0.000 0.000 0.048 0.483 0.145 0.097 0.000 0.000 0.000 0.773 WSW 0.000 0.000 0.000 0.000 0.000 0.048 0.000 0.003 0.000 0.048 W 0.000 0.000 0.048 0.000 0.000 0.000 0.000 WKW 0.000 0.000 0.048 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 NW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.048 0.000 0.000 NNW 0.000 0.048 0.000 0.000 0.000 0.000 0.048 0.097 0.000 0.000 0.000 0.145 SUBTOTAL 0.000 0.000 0.628 1.159 0.773 0.821 0.000 0.000 0.000 3.382 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2120 TOTAL HOURS OF STABILITY CLASS B 72 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS B 70 TOTAL HOURS OF VALID WIND DIRECTICN-WIND SPEED-STABILITY OBSERVATIONS 2070 TOTAL HOURS CALM 0 METEOROLOGICAL FACILITY: SEQUOYAH NUCLEAR PLANT 4

STABILITY BASLD ON DELTA-T BETWEEN 9.25 AND 45.99 METERS WIND SPEED AND DIRECTION MEASURED AT 9.73 METER LEVEL DATE PRINTED: 2-AUG-93 MEAN WIND SPEED = 5.79 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS

O JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY W2ND DIRECT 20N FOR STABILITY CLASS C (-1.7( DELTA T(=-1.5 C/100 M)

SEQUOYAN NUCLEAR PLANT i

APR 1, 93 - JUN 30, 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 0.000 0.000 0.000 0.000 0.193 0.097 0.000 0.000 C.000 0.290 NNE 0.000 0.000 0.000 0.338 0.580 NE 0.193 0.000 0.000 0.000 1.111 0.000 0.000 0.097 0.145 0.145 0.145 0.000 ENE 0.000 0.000 0.700 0.531 0.000 0.000 0.000 0.000 0.000 0.000 E 0.000 0.000 0.000 0.000 0.000 0.048 0.000 0.000 0.000 0.000 0.000 ESE 0.000 0.000 0.C00 0.048 0.000 0.000 0.000 0.000 0.000 0.000 SE 0.000 0.000 a **8 0.000 0.000 0.145 0.000 0.000 0.000 0.000 SSE 0.000 0.000 0.000 0.193 0.048 0.097 0.000 0.000 0.000 0.000 S 0.900 0.000 0.097 0.000 0.145 0.097 0.000 0.145 0.000 0.000 0.000 SSW 0.000 0.000 0.091 0.628 0.338 0.676 0.193 0.000 0.000 0.000 1.594 SW 0.000 0.000 0.0f7 0.773 0.435 0.000 0.000 0.000 0.000 1.304 WSW 0.000 0.000 0.0J0 0.000 0.000 W 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.C00 0.000 0.000 0.000 0.000 WNW 0.000 0.000 0.000 0.000 0.000 0.400 0.000 0.097 0.000 0.000 0.000 NW 0.000 0.000 0.000 0.097 0.000 0.000 0.000 0.000 0.000 0.000 NNW 0.000 0.000 0.000 0.000 0.000 0.048 0.048 0.048 0.000 0.000 0.000 0.145 SUBTOTAL 0.000 0.000 0.(28 2.174 2.174 0.821 0.000 0.000 0.000 5.797 i

TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2120 TOTAL HOURS OF STABILITY CLASS C 123 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY Cf. ASS C 120 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2070 TOTAL ROURS CALM 0 METEOROLOGICAL FACILITY: SEQUOTAH NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 9.25 AND 45.99 METERS WIND SPEED AND DIRECTION MEASURED AT 9.73 METER LEVEL 4 DATE PRINTED: 2-AUG-93 MEAN WIND SPEED = *

.69 NOTE: YOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS 1

y e

JOINT PERCENTAGE FCEQUENCIES OF WIND SPEED BT DIND DIRECTION FOR STABILITY CLASS D (~1.5< DELTA T(=-0.5 C/100 M)

SEQUOTAH NUCLEAR PLANT APR 1, 93 - JUN 30, 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 0.003 0.000 0.580 0.676 C.531 0.242 0.000 0.000 0.000 2.032 F. .. L 0.004 0.145 0.821 1.304 0.821 0.531 0.000 0.000 NE 0.007 0.000 3.628 0.097 1.498 1.014 0.048 0.000 0.000 0.000 0.000 ENE 0.004 0.145 C.628 2.664 0.193 0.000 0.000 0.000 0.000 0.000 0.970 E 0.002 0.048 0.290 0.097 0.000 0.000 0.000 0.000 0.000 0.436 ESE 0.002 0.048 0.386 0.145 0.000 0.097 0.000 0.000 0.000 0.678 SE 0.002 0.048 0.290 0.145 0.097 0.048 0.000 0.000 0.000 0.630 SSE 0.003 0.193 0.386 0.290 0.097 0.290 0.048 5

0.000 0.000 1.307 0.006 0.193 1.111 1.014 0.386 0.628 0.097 0.000 SSW 0.008 0.000 0.000 3.436 1.739 3.430 1.594 0.531 0.000 0.000 0.000 SW 0.005 0.145 0.918 7.303 2.415 1.063 0.628 0.000 0.000 0.000 5.174 WSW 0.001 0.048 0.242 0.193 0.290 0.193 0.000 0.000 0.030 0.968 W 0.000 0.048 0.048 0.097 0.145 0.048 0.000 WNW 0.000 0.000 0.387 0.001 0.000 0.145 0.242 0.290 0.048 0.000 0.000 NW 0.000 0.048 0.000 0.725 0.048 0.048 0.338 0.193 0.000 0.000 0.030 NNW 0.001 0.000 0.242 0.677 0.435 0.435 0.048 0.000 0.000 0.000 1.161 SUBTOTAL 0.048 1.208 9.372 11.739 6.135 3.527 0.145 0.000 0.000 32.174 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2120 TOTAL HOURS OF STABILITY CLASS D 684 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS D 666 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2070 TOTAL HOURS CALM 1 METEOROLOGICAL FACILITY: SEQUOTAH NUCLEAR P LANT STABILITT BASED ON DELTA-T BETWEEN 9.25 AND 45.99 METERS WIND SPEED AND DIRECTION MEASURED AT 9.73 METER LEVEL DATE PRINTED: 2-AUG-93 MEAN WIND SPEED = 4.64 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS

a o

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

SEQUOYAH NUCLEAR PLANT APR 1, 93 - JUN 30, 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 0.379 0.821 2.415 0.918 0.242 0.000 0.000 0.000 0.000 4.775 TNE 0.384 1.014 2.271 0.821 0.097 0.000 0.000 0.000 0.000 4.587 NE 0.130 0.483 0.628 0.097 0.000 0.000 0.000 0.000 0.000 1.338 ENE 0.034 0.193 0.097 0.000 0.000 0.000 0.000 0.000 0.000 0.324 E 0.017 0.048 0.097 0.000 0.000 0.000 0.000 0.000 0.000 ESE 0.023 0.097 0.162 0.097 0.000 0.000 J.000 0.000 0.000 0.000 SE 0.051 0.290 0.216 0.145 0.145 0.048 0.048 0.000 0.000 0.000 SSE 0.062 0.290 0.727 0.244 0.435 0.338 0.676 0.097 0.000 0.000 2.139 s 0.283 0.483 1.932 0.725 0.483 0.870 0.000 SSW 0.000 0.000 4.775 0.367 0.290 2.850 1.159 0.676 0.193 0.000 0.000 SW 0.316 0.000 5.536 0.435 2.271 1.159 0.435 0.435 0.000 0.000 0.000 WSW 0.090 0.242 5.051 0.531 0.097 0.048 0.097 0.000 0.000 0.000 W 0.062 0.145 1.105 0.386 0.242 0.097 0.000 0.000 0.000 0.000 WNW 0.068 0.193 0.932 0.386 0.048 0.000 0.048 0.000 0.000 0.000 NW 0.079 0.145 0.744 0.531 0.048 0.048 0.145 0.000 0.000 0.000 0.997 NNW 0.119 0.483 0.531 0.435 0.242 0.048 0.000 0.000 0.000 1.858 SUBTOTAL 2.464 5.652 15.411 6.329 2.754 2.560 0.097 0.000 0.000 35.266 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2120 TOTAL HOURS OF STABILITY CLASS E 747 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS E 730 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2070 TOTAL HOURS CALM 51 METEOROLOGICAL FACILITY: SEQUOYAH NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 9.25 AND 45.99 METERS WIND SPEED AND DIRECTION MEASURED AT 9.73 METER LEVEL DATE PRINTED: 2-AUG-93 MEAN WIND SPEED = 3.25 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS

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I Table 12 Joint Frequency Distribution in Percent  ;

for Ground Level Releases- l Third Quarter i

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JOINT PERCENTAGE FR3OUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS A (DELTA T<=-1.9 C/100 M)

SEQUOYAH NUCLEAR PLANT JUL 1, 93 - SEP 30, 93 WIND WIND SPEED (MPH)

DIRECTION CALM 0.6-1.4 1.5-3.4 3.5-5.4 5.5-7.4 1.5-12.4 12.5-18.4 18.5-24.4 >=24.5 TOTAL N 0.000 0.000 0.000 0.552 0.552 0.138 0.000 0.000 0.000 1.243 NME 0.000 0.000 0.322 1.427 0.690 0.092 0.000 0.000 0.000 2.531 NE 0.000 0.000 0.552 0.920 0.276 0.000 0.000 0.000 0.000 1.749 ENE 0.000 0.000 0.184 0.184 0.000 0.000 0.000 0.000 0.000 0.368 E 0.000 0.000 0.092 0.276 0.000 0.000 0.000 0.000 0.000 0.368 ESE 0.000 0.000 0.230 0.184 0.000 0.000 0.000 0.000 0.000 0.414 SE 0.000 0.000 0.046 0.368 0.046 0.000 0.000 0.000 0.000 0.460 SSE 0.000 0.000 0.138 0.322 0.046 0.046 0.000 0.000 0.000 0.552 5 0.000 0.000 0.230 0.552 0.322 0.184 0.000 0.000 0.000 1.289 SSW 0.000 0.000 0.092 1.703 1.611 0.046 0.000 0.000 SW 0.000 3.a51 0.000 0.000 0.138 1.565 1.335 0.092 0.000 0.000 0.000 WSW 3.129 0.000 0.000 0.000 0.046 0.184 0.000 0.000 0.000 0.000 0.230 W 0.000 0.000 0.000 0.184 0.276 0.000 0.000 0.000 0.000 0.460 WNW 0.000 0.000 0.000 0.046 0.138 0.138 0.000 0.000 0.000 0.322 nw 0.000 0.000 0.046 0.184 0.046 0.230 0.000 0.000 0.000 0.506 NNW 0.000 0.000 0.000 0.138 0.276 0.138 0.000 0.000 0.000 0.552 SUBTOTAL 0.000 0.000 2.071 8.652 5.798 1.104 0.000 0.000 0.000 17.625 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2189 TOTAL HOURS OF STABILIT.* CLASS A 384 TOTAL HOURS OF VALID WIN 1 DIRECTION-WIND SPEED-STABILITY CLASS A 383 TOTAL HOURS OF VALID WINL DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2173 TOTAL HOURS CALM 0 METEOROLOGICAL FACILITY: SEQUOTAH NUCLEAR PLANT STABILITY BASED ON DELTA T BETWEEN 9.25 AND 45.99 METERS WIND SPEED AND DIRECTIOF, MEASURED AT 9.73 METER LEVEL DATE PRINTED: 21-OCT-93 MEAN WIND SPEED = 5.17 1

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SEQUOTAH NUCLEAR PLANT JUL 1 93 - SEP 30, 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 0.356 1.150 3.682 0.506 0.092 0.046 0.000 0.000 0.000 5.832 NME 0.322 1.104 3.267 0.598 0.000 0.000 NE 0.000 0.000 0.000 5.292 0.075 0.552 0.460 0.000 0.000 0.000 0.000 0.000 ENE 0.030 0.230 0.000 1.087 0.184 0.046 0.000 0.000 0.000 0.000 0.000 E 0.017 0.138 0.092 0.000 0.491 0.000 0.000 0.000 0.000 0.000 0.247 ESE 0.027 0.184 0.114 0.000 0.046 0.000 0.000 0.000 0.000 0.441 SE 0.030 0 . .;7 6 0.138 0.092 0.000 0.000 0.000 0.000 0.000 0.537 SSE 0.081 0.644 0.460 0.092 0.092 0.000 0.003 0.000 0.000 1.370 S 0.183 0.644 1.841 0.368 0.092 0.000 0.000 0.000 0.000 3.128 SSW 0.268 0.966 2.669 0.414 0.184 0.000 0.000 0.000 0.000 SW 0.169 0.414 1.887 0.874 4.501 0.046 0.046 0.000 0.000 0.000 WSW 0.098 0.230 1.104 0.138 3.437 0.000 0.000 0.000 0.000 0.000 W 0.061 0.368 0.460 0.184 0.092 1.571 0.046 0.000 0.000 0.000 1.211 WNW 0.058 0.230 0.552 0.184 0.000 0.000 0.000 0.000 0.000 NW 0.061 0.414 0.414 0.230 1.024 0.000 0.000 0.000 0.000 0.000 1.119 NNW 0.142 0.644 1.289 0.506 0.046 0.000 0.000 0.000 0.000 2.627 SUBTOTAL 1.979 8.191 18.684 4.234 0.690 0.138 0.000 0.000 0.000 33.916 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2189 TOTAL HOURS OF STABILITY CLASS E 745 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS E 737 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2173 TOTAL HOURS CALM 43 METEOROLOGICAL FACILITT: SEQUOTAH NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 9.25 AND 45.99 METERS WIND SPEED AND DIRECTION MEASURED AT 9.73 METER LEVEL DATE PRINTED: 21-OCT-93 MEAN WIND SPEED = 2.19 NOTE: TOTALJ AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS

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3 JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR ,

STABILITY CLASS A (DELTA T<=-1.9 C/100 M)

SEQUOYAH NUCLEAR P LANT OCT 1, 93 - 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 0.000 0.000 0.000 0.000 0.046 0.091 0.000 0.000 0.000 0.137 NNE 0.000 0.000 0.046 0.319 0.411 0.137 0.000 0.000 0.000 0.913 NE 0.000 0.000 0.091 0.411 0.000 0.000 0.000 0.000 0.000 0.502 ENE 0.000 0.000 0.046 0.000 0.000 0.000 0.000 0.000 0.000 0.046 E 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 ESE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 SE 0.000 0.000 0.000 0.137 0.000 0.000 0.000 0.000 0.000 0.137 SSE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 S 0.000 0.000 0.000 0.091 0.137 0.000 0.000 0.000 0.000 0.228 SSW 0.000 0.000 0.000 0.000 0.456 0.183 0.000 0.000 0.000 0.639 SW 0.000 0.000 0.046 0.183 0.183 0.091 0.000 0.000 0.000 0.502 wSW 0.000 0.000 0.000 0.046 0.046 0.000 0.000 0.000 0.000 0.091 W 0.000 0.000 0.000 0.000 0.046 0.000 0.000 0.000 0.000 0.046 WNW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 MW 0.000 0.000 0.000 0.000 0.000 0.046 0.000 0.000 0.000 0.046 NNW 0.000 0.000 0.000 0.046 0.000 0.091 0.000 0.000 0.000 0.137 SUBTOTAL 0.000 0.000 0.228 1.232 1.324 0.639 0.000 0.000 0.000 3.423 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2202 TOTAL HOURS OF STABILITY CLASS A 75 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS A 75 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2191 TOTAL HOURS CALM 0 METEOROLOGICAL FACILITY: SEQUOYAH NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 9.25 AND 45.99 METERS WIND SPEED AND DIRECTION MEASURED AT 9.73 METER LEVEL DATE PRINTED: 25-JAN-94 MEAN WIND SPEED = 5.87 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS l

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

SEQUOYAH NUCLEAR PLANT OCT 1, 93 - DEC 31, 93 WIND 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 DIRECTION 0.005 0.137 1.187 1.871 1.643 0.730 0.000 0.000 0.000 5.573 N

0.005 0.000 1.278 1.506 1.278 0.730 0.000 0.000 0.000 4.797 NNE 0.004 0.046 1.004 0.456 0.000 0.000 0.000 0.000 0.000 1.510 NE 0.003 0.137 0.502 0.046 0.000 0.000 0.000 0.000 0.000 0.687 ENE 0.001 0.000 0.274 0.000 0.000 0.000 0.000 0.000 0.000 0.215 E

0.001 0.137 0.04f 0.046 0.000 0.000 0.000 0 000 0.000 0.229 ESE SE 0.000 0.000 0.046 0.091 0.000 0.000 0.000 0.000 0.000 0.137 0.002 0.091 0.411 0.091 0.046 0.G00 0.000 0.000 0.000 0.641 SSE S 0.005 0.091 1.187 1.232 0.776 0.091 0.000 0.000 0.000 3.383 0.C07 0.137 1.506 3.423 1.095 0.411 0.000 0.000 0.000 6.579 SSW SW 0.007 0.183 1.506 1.506 0.548 0.228 0.000 0.000 0.000 3.977 0.001 0.137 0.091 0.046 C.000 0.137 0.000 0.000 0.000 0.412 WSW W 0.001 0.091 0.183 0.046 0.091 0.000 0.000 0.000 0.000 0.412 WNW 0.001 0.046 0.137 0.183 0.365 0.228 0.000 0.000 0.000 0.959 NW 0.001 0.091 0.228 0.730 0.411 0.274 0.000 0.000 0.000 1.736 NNW 0.002 0.046 0.548 1.141 1.597 0.822 0.046 0.000 0.000 4.201 SUBTOTAL 0.046 1.369 10.132 12.414 7.850 3.651 0.046 0.000 0.000 35.509 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2202 TOTAL HOURS OF STABILITY CLASS D 786 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS D 778 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2191 TOTAL HOURS CALM 1 METEOROLOGICAL FACILITY: SEQUOYAH NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 9.25 AND 45.99 METERS WIND SPEED AND DIRECTION MEASURED AT 9.73 METER LEVEL DATE PRINTED: 25-JAN-94 MEAN WIND SPEED = 4.60 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS 5

w JOINT PERCENTAGE FREQUENCIES OF W2ND SPEED BY WIND DIRECTION FOR STABILITY CLASS E {-0.5< DELTA T(= 1.5 C/100 M)

SEQUOYAH NUCLEAR PLANT OCT 1, 93 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 0.059 0.685 2.967 1.050 0.685 0.000 0.000 0.000 0.000 5.445 NNE 0.064 0.822 3.149 0.685 0.183 0.000 0.000 0.000 0.000 4.902 NE 0.013 0.365 0.456 0.137 0.000 0.000 0.000 0.000 0.000 0.972 ENE 0.004 0.091 0.137 0.000 0.000 0.000 0.000 0.000 0.000 0.232 E 0.005 0.274 0.046 0.046 0.000 0.000 0.000 0.000 0.000 0.370 ESE 0.001 0.046 0.046 0.000 0.000 0.000 0.000 0.000 0.000 0.093 SE 0.004 0.274 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.278 SSE 0.010 0.365 0.228 0.137 0.000 0.046 0.000 0.000 0.000 0.785 5 0.032 0.502 1.461 1.461 0.365 0.091 0.000 0.000 0.000 3.911 SSW 0.061 0.502 3.286 2.282 0.502 0.137 0.000 0.000 0.000 6.770 SW 0.046 0.228 2.602 1.187 0.228 0.046 0.000 0.000 0.000 4.336 WSW 0.021 0.456 0.822 0.274 0.046 0.000 0.000 0.000 0.000 1.618 W 0.010 0.274 0.365 0.183 0.046 0.046 0.000 0.000 0.000 0.923 WNW 0.003 0.183 0.000 0.319 0.046 0.091 0.000 0.000 0.000 0.642 0.137 0.593 0.548 0.228 0.137 0.000 0.000 0,000 1.655 NW 0.012 NRW 0.020 0.183 1.050 0.776 0.411 0.091 0.000 0.000 0.000 2.530 SUBTOTAL 0.365 5.386 17.207 9.083 2.738 0.685 0.000 0.000 0.000 35.463 TOTAL HOURS OF VALID STABILITY OBSEaVATIONS 2202 TOTAL HOURS OF STABILITY CLASS E 780 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS E 777 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2191 TOTAL HOURS CALM 8 METEOROLOGICAL FACILITY: SEQUOYAH NUCLEAR P LANT STABILITY BASED ON DELTA-T BETWEEN 9.25 AND 45.99 METERS WIND SPEED AND DIRECTION MEASURED AT 9.73 METER LEVEL DATE PRINTED: 25-JAN-94 MEAN WIND SPEED = 3.10 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS

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