ML11167A060

OL - FW: TVA Letter to NRC_05-06-2011_RAI Response from Public Meeting on May 12, 2011

ML11167A060
Person / Time
Site:	Watts Bar
Issue date:	05/26/2011
From:	Office of Nuclear Reactor Regulation
To:	Division of Operating Reactor Licensing
References
Download: ML11167A060 (42)

Text

1 WBN2Public Resource From:

Poole, Justin Sent:

Thursday, May 26, 2011 4:29 PM To:

Beissel, Dennis; Brown, Leta; Hickey, Eva E Cc:

WBN2HearingFile Resource; Milano, Patrick

Subject:

FW: TVA letter to NRC_05-06-2011_RAI Response from Public Meeting on May 12, 2011 Attachments:

05-26-2011_RAI Response from Public Meeting on May 12, 2011_Final.pdf Here is a copy of the letter TVA sent to document control today.

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

Sent: Thursday, May 26, 2011 4:24 PM To: Poole, Justin Cc: Crouch, William D

Subject:

TVA letter to NRC_05-06-2011_RAI Response from Public Meeting on May 12, 2011 PleaseseeattachedTVAletterthatwassenttotheNRC.

ThankYou,

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

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

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

Hearing Identifier:

Watts_Bar_2_Operating_LA_Public Email Number:

399 Mail Envelope Properties (19D990B45D535548840D1118C451C74D840AB18629)

Subject:

FW: TVA letter to NRC_05-06-2011_RAI Response from Public Meeting on May 12, 2011 Sent Date:

5/26/2011 4:29:04 PM Received Date:

5/26/2011 4:29:05 PM From:

Poole, Justin Created By:

Justin.Poole@nrc.gov Recipients:

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

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

Tracking Status: None "Beissel, Dennis" <Dennis.Beissel@nrc.gov>

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

Tracking Status: None "Hickey, Eva E" <eva.hickey@pnl.gov>

Tracking Status: None Post Office:

HQCLSTR02.nrc.gov Files Size Date & Time MESSAGE 774 5/26/2011 4:29:05 PM 05-26-2011_RAI Response from Public Meeting on May 12, 2011_Final.pdf 247110 Options Priority:

Standard Return Notification:

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Recipients Received:

Tennessee Valley Authority, Post Office Box 2000, Spring City, Tennessee 37381-2000 May 26, 2011 10 CFR 50.4(b)(6) 10 CFR 50.34(b)

U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, D.C. 20555-0001 Watts Bar Nuclear Plant, Unit 2 NRC Docket No. 50-391

Subject:

WATTS BAR NUCLEAR PLANT (WBN) UNIT 2 - RESPONSE TO REQUEST FOR INFORMATION FROM PUBLIC MEETING ON MAY 11, 2011

References:

1.

E-mail from Justin C. Poole, U.S. Nuclear Regulatory Commission to William D. Crouch, TVA dated May 11, 2011

2.

TVA to NRC letter dated May 20, 2011, Watts Bar Nuclear Plant (WBN) Unit 2 - Response to Final Safety Analysis Report (FSAR)

Chapter 11 and Final Supplemental Environmental Impact Statement (FSEIS) Request for Additional Information The purpose of this letter is to provide a response to questions received via a handout during a public meeting held on May 11, 2011 in Rockville, Maryland and subsequently via an email received on May 11, 2011 (Reference 1), regarding the review of Unit 2 FSAR, Chapters 11 and12 and the environmental review. This information is being requested as part of the effort to ensure consistency between the FSAR review and environmental review.

provides the requested information. Enclosure 2 provides X/Q and D/Q information from the site to a radius of 50 miles. This information will be added to the Unit 2 FSAR in Amendment 104. Enclosure 3 provides the list of commitments.

Should you have any questions, please contact Bill Crouch at (423) 365-2004.

U.S. Nuclear Regulatory Commission Page 3 May 26, 2011 bcc (Enclosures):

Stephen Campbell U.S. Nuclear Regulatory Commission MS 08H4A One White Flint North 11555 Rockville Pike Rockville, Maryland 20852-2738 Charles Casto, 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 Response to NRC Questions Received during May 11, 2011 Public Meeting Request For Additional Information E1-1 Information Required for Staff Analysis for Dose from Gaseous Effluents The staff will be performing dose assessment for dose to the public from gaseous effluents from Watts Bar Nuclear Unit 2 using the NRC developed GASPAR II computer code (Strenge et al. 1986) developed using the approach specified in Regulatory Guide 1.109 (NRC 1977). The following is a list of input values needed to run the computer code. Provide the data, the source of the data and any appropriate assumptions. Refer to RG 1.109 for any questions on the need for the parameter or more detail on what the parameter is.

Please provide answers to the following questions, as well as Tables 1-5.

1. Confirm that there are no milk goat or meat animals are present in the 5-mi radius.

TVA Response Based on the 2007 Land Use Survey (LUS), Watts Bar Nuclear Plant does not have any milk goats within the 5 mile radius.

Beef cattle are assumed to be located at the site boundary for all 16 sectors.

2. Provide the direction and distance for the nearest residence, nearest garden, and nearest milk cow.

TVA Response See Attachment A taken from the 2007 LUS.

3. Confirm that releases are calculated as ground level releases.

TVA Response All releases from Watts Bar Nuclear Plant are considered to be ground releases for dose calculations.

4. Provide nearest site boundary distances for the 16 cardinal compass directions TVA Response See Attachment B for the nearest site boundary for each sector.

Response to NRC Questions Received during May 11, 2011 Public Meeting Request For Additional Information E1-2

5. Provide the estimate of direct radiation doses from sources within the site for each of the 22.5-degree radial sectors centered on the 16 cardinal compass directions for radial distances of 2, 4, 6, 8, 10, 20, 40, 60, and 80 km (1.2, 2.5, 3.7, 5, 6.2, 12, 25, 27, and 50 mi) from the reactor.

TVA Response See Attachment C taken from the 2007 Environmental Dosimetry Data at distances monitored at WBN. The most distant point routinely monitored is 15 miles from the plant. The data indicates that dose at the monitored locations is essentially the same irrespective of distance and direction. These readings appear to be indicative of offsite doses from direct radiation that are so low as to be indistinguishable from normal background radiation.

6. Confirm that there are no unusual animals, plants, agricultural practices, game harvests, or food processing operations having the potential to contribute 10 percent or more to either individual or population doses in areas affected by liquid effluents, and food-processing operations involving large quantities of water.

TVA Response Based on the 2007 Land Use Survey, Watts Bar does not have any unusual animals, plants, agricultural practices, game harvests that would contribute 10% or more to either the individual or population doses in areas affected by liquid or gaseous pathways and no food processing operations involving large quantities of water.

7. Identify and provide a reference for direct radiation sources within or onsite out-of-plant as solid waste (e.g., independent fuel storage).

TVA Response Outside Radwaste Storage Operational considerations make it necessary to temporarily store containers of radioactive materials and radioactive wastes in designated areas such as the concrete pad in the east yard outside of the Condensate Demineralizer Waste Evaporator (CDWE). Drums, boxes, and liners of radioactive materials or wastes including Dry Active Waste (DAW) may be stored in outside storage areas after being packaged for shipment or storage. Liners of dewatered resin (that have been processed for imminent shipment offsite) are stored the same as other containers. The outside storage area provides sufficient storage to accommodate one full shipment of DAW or radioactive materials. The concrete pad east of the CDWE will also be used to temporarily store (less than 5 years) DAW. Watts Bar does not have an independent wet or dry fuel storage facility.

Monitoring in the immediate vicinity of this storage shows dose rates that range from 81 to 180 mrem/year. The monitored values vary substantially throughout the year depending on the quantity of material being stored. Other monitored Response to NRC Questions Received during May 11, 2011 Public Meeting Request For Additional Information E1-3 locations on the site do not appear to vary based on the dose rate from the Radwaste Storage area.

Old Steam Generator Storage Facility (OSGSF)

The OSGSF is a non-safety related, non-seismic reinforced concrete structure that provides interim storage for the Old Steam Generators (OSGs) removed from the Reactor Building as a result of steam generator replacement during the Unit 1 Cycle 7 refueling outage. The OSGSF is located north of the plant, outside the protected area but within the exclusion area and site boundary. The reinforced concrete walls and roof (minimum density of 145 lb/ft3) of the OSGSF and its access vestibule have been designed to ensure that the dose rates outside the facility are below station administrative and 10 CFR 20 and 40 CFR 190 limits.

Radiation zones inside the OSGSF were calculated to range from a radiation area near the OSGs to unlimited access at the vestibule door and unlimited access outside the OSGSF. Based on measured radiation levels inside the OSGSF, the interior of the OSGSF is controlled as a radiologically controlled area.

The radiation dose assessment was accomplished using the MCNP (Monte Carlo NParticle) computer code. MCNP is a Monte Carlo program that calculates direct and skyshine doses.

In a manner similar to the Radwaste Storage discussed above, this structure is routinely monitored. The dose rate ranges from 61 to 79 mrem/year. Values in this range are typical of very slightly higher than measured at other locations on site.

Response to NRC Questions Received during May 11, 2011 Public Meeting Request For Additional Information E1-4

8. The following five tables of information were requested:

Table 1 Item Parameter Units Value Source Assumptions 1

Distance (in miles) from the site to the northeast corner of the U.S.

miles 5

NUREG/CR-4653 Any dummy value >0 in order not to abort GASPAR 2

Fraction of the year that leafy vegetables are grown 0.33 WBN LUS Survey 4 out 12 months 3

Fraction of the year that milk cows are on pasture 0.65 2

Value was used for all three dairy farms 4

Fraction of the maximum individuals vegetable intake that is from his own garden 1

WBN ODCM Conservatively assumed that all food eaten by the average individual is grown within the sector.

5 Fraction of milk-cow feed intake that is from pasture while on pasture.

kg/d 64 2, 6 N/A 6

Average absolute humidity over the growing season g/m3 9

See Attachment D See Attachment D 7

Average temperature over the growing season (deg F).

T is used only to calculate absolute humidity.

If T is supplied, H must be supplied as relative humidity

(%). Otherwise set T=0 or blank N/A 0

N/A N/A 8

Fraction of the year that goats are on pasture.

N/A N/A N/A No Goats in 5 mile radius of WBN 9

Fraction of goat-feed intake that is from pasture while on pasture N/A N/A N/A No Goats in 5 mile radius of WBN 10 Fraction of the year that beef cattle are on pasture.

N/A 1

2 N/A 11 Fraction of beef-cattle feed intake that is from pasture while the cattle are on pasture.

kg/d 64 2, 6 N/A Response to NRC Questions Received during May 11, 2011 Public Meeting Request For Additional Information E1-5 Table 1 (continued)

Item Parameter Units Value Source Assumptions 12 Consumption factors for milk, meat, leafy vegetables, and vegetables Milk (

L/yr) 2 consumption factors for max individual Population doses are determined by multiplying the average dose for each sector by the population in that sector. The average population dose is then multiplied by the ratio of the average consumptions obtained from RG 1.109 Table E-4 divided by the consumption factors for the max individuals Adult 310 Teen 400 Child 330 Infant 330 Meat (kg/yr)

Adult 110 Teen 65 Child 41 Infant 0

Leafy Vegetable (kg/yr)

Adult 64 Teen 42 Child 26 Infant 0

Vegetable (kg/yr)

Adult 520 Teen 630 Child 520 Infant 0

Response to NRC Questions Received during May 11, 2011 Public Meeting Request For Additional Information E1-6 Table 2.

Present Annual Milk Production Sector and Radial Distance Around the WBN2 Site for the Year 2007.

Sectors Year Radii/Distances (mi) 0-1 1-2 2-3 3-4 4-5 5-10 10-20 20-30 30-40 40-50 0-50 North 2007 North-Northeast 2007 Northeast 2007 East-Northeast 2007 East 2007 East-Southeast 2007 4.17 Southeast 2007 South-Southeast 2007 South 2007 South-Southwest 2007 1.42 2.08 Southwest 2007 West-Southwest 2007 West 2007 West-Northwest 2007 Northwest 2007 North-Northwest 2007 Total 1

1 1

Response to NRC Questions Received during May 11, 2011 Public Meeting Request For Additional Information E1-7 Table 3.

Present Annual Meat Production Sector and Radial Distance Around The WBN2 Site for the Year 2007.

Sectors Year Radii/Distances (mi) 0-1 1-2 2-3 3-4 4-5 5-10 10-20 20-30 30-40 40-50 0-50 North 2007 0.96 North-Northeast 2007 1.23 Northeast 2007 0.98 East-Northeast 2007 0.85 East 2007 0.80 East-Southeast 2007 0.78 Southeast 2007 0.78 South-Southeast 2007 0.78 South 2007 0.83 South-Southwest 2007 0.96 Southwest 2007 1.04 West-Southwest 2007 0.89 West 2007 0.91 West-Northwest 2007 0.87 Northwest 2007 0.87 North-Northwest 2007 0.91 Total 14 2

Response to NRC Questions Received during May 11, 2011 Public Meeting Request For Additional Information E1-8 Table 4.

Present Annual Vegetable Production Sector and Radial Distance around the WBN2 Site for the Year 2007 Sectors Year Radii/Distances (mi) 0-1 1-2 2-3 3-4 4-5 5-10 10-20 20-30 30-40 40-50 0-50 North 2007 4.76 North-Northeast 2007 3.84 Northeast 2007 2.08 East-Northeast 2007 3.06 East 2007 3.96 East-Southeast 2007 2.96 Southeast 2007 2.88 South-Southeast 2007 4.63 South 2007 1.40 South-Southwest 2007 1.23 Southwest 2007 5.03 West-Southwest 2007 2.90 West 2007 3.18 West-Northwest 2007 3.67 Northwest 2007 1.97 North-Northwest 2007 2.86 Total 3

5 6

2 Response to NRC Questions Received during May 11, 2011 Public Meeting Request For Additional Information E1-9 Table 5.

Present Annual Leafy Vegetable production Sector and Radial Distance around the WBN2 Site for the Year 2007.

Sectors Year Radii/Distances (mi) 0-1 1-2 2-3 3-4 4-5 5-10 10-20 20-30 30-40 40-50 0-50 North 2007 4.76 North-Northeast 2007 3.84 Northeast 2007 2.08 East-Northeast 2007 3.06 East 2007 3.96 East-Southeast 2007 2.96 Southeast 2007 2.88 South-Southeast 2007 4.63 South 2007 1.40 South-Southwest 2007 1.23 Southwest 2007 5.03 West-Southwest 2007 2.90 West 2007 3.18 West-Northwest 2007 3.67 Northwest 2007 1.97 North-Northwest 2007 2.86 Total 0

3 5

6 2

Response to NRC Questions Received during May 11, 2011 Public Meeting Request For Additional Information E1-10 Information Required for Staff Analysis for Dose from Liquid Effluents The staff will be performing dose assessment for dose to the public from liquid effluents from Watts Bar Nuclear Unit 2 using the NRC developed LADTAP II computer code (Strenge et al. 1986) developed using the approach specified in Regulatory Guide 1.109 (NRC 1977). The following is a list of input values needed to run the computer code. Provide the data, the source of the data and any appropriate assumptions. Refer to RG 1.109 for any questions on the need for the parameter or more detail on what the parameter is. Some supplementary information is provided in Regulatory Guide 1.113 (NRC 1977) to which the licensee is referred.

1. The staff compares their calculations against the applicants. Will TVA be revising the information in the TVA application or will the staffs comparison be against the 2008 application?

TVA Response TVA is using the 2007 LUS and clarified both the liquid and gaseous source terms.

Response to NRC Questions Received during May 11, 2011 Public Meeting Request For Additional Information E1-11

2. Projected population by sector and radial distance around the WBN2 site for the year 2040, including totals for each sector and a total population. See Table I below:

Table I.

Projected Population by Sector and Radial Distance Around the WBN2 Site for the Year 2040. Population with Projections to the Year 2040 Sectors Year Radii/Distances (mi) 0-1 1-2 2-3 3-4 4-5 5-10 0-10(a) 10-20 20-30 30-40 40-50 0-50 North 2040 0 18 0

0 135 2465 2619 1885 2778 4798 6172 18222 North-Northeast 2040 0

0 18 411 185 1536 2150 11762 18766 14502 2547 49727 Northeast 2040 0

0 18 308 287 827 1441 3783 16734 29838 78334 130130 East-Northeast 2040 0

0 18 308 287 497 1110 3553 29539 63798 253831 351832 East 2040 0

8 431 308 616 552 1915 11352 18647 30063 44013 105990 East-Southeast 2040 0

0 0

27 41 68 135 6230 20120 5068 3280 34833 Southeast 2040 8

0 0

29 39 135 203 19852 15185 3950 7822 44012 South-Southeast 2040 21 0

0 246 413 103 783 8951 12907 2918 48593 74151 South 2040 16 0

0 0 1983 3824 5823 4586 42883 56430 17985 127707 South-Southwest 2040 0

0 21 0

0 546 567 5725 42517 46281 106392 201482 Southwest 2040 0

0 0

0 0

1051 1051 12978 14499 62307 111795 202630 West-Southwest 2040 0

6 36 59 126 711 938 12791 2837 2840 3372 22778 West 2040 0 14 22 101 90 710 937 3406 5555 2944 5474 18316 West-Northwest 2040 0

0 22 126 79 490 717 2091 4372 5654 20511 33345 Northwest 2040 0 108 332 376 526 2655 3998 2889 18634 10462 15956 51940 North-Northwest 2040 0

0 0

173 123 3116 3413 1536 33843 11609 5890 56290 Total 45 155 919 2471 4930 19287 27799 113368 299818 353432 728968 1523385 Response to NRC Questions Received during May 11, 2011 Public Meeting Request For Additional Information E1-12 Table II.

Item Parameter Units Value Source Assumptions 1

Liquid effluent discharge rate ft3/s 0.33 FSAR Table 11.2-2 Maximum rate of undiluted radwaste discharge 2

Reconcentration model (see Reg Guide 1.113)

No model /

completely mixed model/plug-flow model/partially mixed model No model or considered a direct release 4

Liquid waste is discharged directly into the cooling tower blowdown line which enters the TN river 3

Effluent discharge rate to receiving body ft3/s 44.56 +

0.33 =

44.89 FSAR Section 11.2.4 Minimum rate of cooling tower blowdown dilution flow +

radwaste discharge rate Total volume of impoundment ft3 N/A N/A N/A 4

Fraction of population who are adults 0.665 6

N/A 5

Fraction of population who are teens 0.153 6

Fraction of population 6

Fraction of population who are children 0.168 6

Fraction of population 7

Liquid effluent source term by radionuclide (Ci/yr)

See Attachment E

7 N/A 8

9 Shore width factor (see Reg Guide 1.109) none 0.2 2

N/A Include items 10-14 or items 15-20 10 Dilution factor for aquatic food pathways and external exposure while boating See Attachment F

1, 8 See Attachment F 11 Dilution factor for shoreline and swimming exposure See Attachment F

1, 8 See Attachment F 12 Dilution factor for drinking water pathway See Attachment G

1, 8 See Attachment G 13 Transit time from discharge to exposure location for all pathways except drinking water h

0 N/A For conservatism 0 was assumed 14 Transit time from discharge to drinking water supply h

0 N/A For conservatism 0 was assumed Response to NRC Questions Received during May 11, 2011 Public Meeting Request For Additional Information E1-13 Table II.

Item Parameter Units Value Source Assumptions Include Items 15-20 if no value was given for items 10-12. Include one set of items 15-20 for each dilution factor (Items 10-12) not provided above.

15 Surface water model 16 Average flow velocity Ft/s N/A N/A N/A 17 Average depth of water body ft N/A N/A N/A 18 Downshore distance from discharge point to usage location ft.

N/A N/A N/A 19 Offshore, distance to water usage location ft.

N/A N/A N/A 20 Width of river or depth of discharge point in lake ft.

N/A N/A N/A 21 Consumption and usage factors for adults, teens, children, and infants Shoreline usage (hr/yr)

(adult)

(teen)

(child)

(infant)

Water usage (L/yr)

(adult)

(teen)

(child)

(infant)

Fish consumption (kg/yr)

(adult)

(teen)

(child)

(infant) 500 500 500 500 730 510 510 330 21 16 6.9 0.0 2

2 Max. individual Shoreline conservatism is based on the max individual visits the shoreline for 10 hours1.157407e-4 days <br />0.00278 hours <br />1.653439e-5 weeks <br />3.805e-6 months <br /> per week for 50 weeks per year Population usage are the same as RG 1.109 except shoreline is 5 hr per visits per year at each reach For Each Sport Fishing Usage Location N/A 22 Surface water model N/A N/A N/A 23 Average flow velocity Ft/s N/A N/A N/A 24 Average depth of water body ft N/A N/A N/A 25 Downshore distance from discharge point to usage location ft.

N/A N/A N/A 26 Offshore, distance to water usage location ft.

N/A N/A N/A 27 Width of river or depth of discharge point in lake ft.

N/A N/A N/A Sport Fish harvest - Provide a separate dataset for each location 28 Identification mi downstream 18 N/A Usage location is considered from 528 to Response to NRC Questions Received during May 11, 2011 Public Meeting Request For Additional Information E1-14 Table II.

Item Parameter Units Value Source Assumptions 510 TRM downstream (4799 acres) 29 Fish Harvest Kg/yr 662 5

3.04 lb/acre/yr 30 Dilution See Attachment F

1, 8 See Attachment F 31 Transit time h

0 N/A For conservatism 0 was assumed Commercial fish harvest - provide a separate dataset for each location WBN does not have commercial fishing.

32 identification N/A N/A N/A 33 Fish Harvest Kg/yr N/A N/A N/A 34 Dilution N/A N/A N/A 35 Transit time h

N/A N/A N/A Sport invertebrate harvest - provide a separate dataset for each location WBN ODCM does not consider invertebrates.

36 identification N/A N/A N/A 37 invertibrate Harvest Kg/yr N/A N/A N/A 38 Dilution N/A N/A N/A 39 Transit time h

N/A N/A N/A Commercial invertebrate harvest - provide a separate dataset for each location WBN ODCM does not consider invertebrates.

40 identification N/A N/A N/A 41 invertibrate Harvest Kg/yr N/A N/A N/A 42 Dilution N/A N/A N/A 43 Transit time h

N/A N/A N/A Population shoreline - provide a separate dataset for each location 44 Identification N/A See Attachment F

N/A N/A 45 Dilution See Attachment F

1, 8 See Attachment F 46 Transit time hr 0

For conservatism 0 was assumed 47 Usage (person-hours) hr See Attachment F

WBN ODCM Population usage for shoreline is 5 Response to NRC Questions Received during May 11, 2011 Public Meeting Request For Additional Information E1-15 Table II.

Item Parameter Units Value Source Assumptions hr per visits per year at each reach 48 Shorewidth factor 0.2 2

N/A Population swimming - provide a separate dataset for each location WBN ODCM does not consider swimming.

49 Identification N/A N/A N/A 50 Total Exposure time for swimming for the current usage location hr/y N/A N/A N/A 51 Dilution Factor for the current swimming location N/A N/A N/A 52 Transit time from the release point to the current usage location hr N/A N/A N/A Population Boating - provide a separate dataset for each location WBN ODCM does not consider boating.

53 Identification N/A N/A N/A 54 Total Exposure time for boating for the current usage location hr/y N/A N/A N/A 55 Dilution Factor for the current swimming location N/A N/A N/A 56 Transit time from the release point to the current usage location hr N/A N/A N/A Population drinking water - provide a separate dataset for each location 57 Supplier Identification N/A Attachment G

58 Total population supplied by the current drinking water location N/A Attachment G

59 Dilution factor for current usage location intake See Attachment G

1, 8 See Attachment G 60 Transit time from discharge point (to receiving water body) hr 0

For conservatism 0 was assumed 61 Supply rate of drinking water for current water plant. (used only if pop = 0)

Gal/d N/A N/A pop not = 0 62 Ave. rate of water usage by individuals for the current water-plant service area (used Gal/d N/A N/A pop not = 0 Response to NRC Questions Received during May 11, 2011 Public Meeting Request For Additional Information E1-16 Table II.

Item Parameter Units Value Source Assumptions only if pop = 0) 63 Surface water model N/A N/A N/A 64 Average flow velocity Ft/s N/A N/A N/A 65 Average depth of water body Ft N/A N/A N/A 66 Downshore distance from discharge point to usage location ft.

N/A N/A N/A 67 Offshore, distance to water usage location ft.

N/A N/A N/A 68 Width of river or depth of discharge point in lake ft.

N/A N/A N/A Irrigated foods: include a separate dataset for each irrigated food. If there are no irrigated foods these items may be omitted No irrigation pathway at WBN 69 Food type Vegetation/leafy vegetation/milk/

meat N/A N/A N/A 70 Irrigation rate L.m-2.mo-1 N/A N/A N/A 71 Fr. of animal feed not produced with contaminated irrigation water N/A N/A N/A 72 Fr. of animal drinking water not obtained from contaminated irrigation water supply.

N/A N/A N/A 73 Total production of food product within 50 miles of the site Kg/y or L/y N/A N/A N/A 74 Growing period for current food product D

N/A N/A N/A 75 Crop yield for current food product Kg/m2 N/A N/A N/A 76 Rate of consumption by maximally exposed adult Kg/y N/A N/A N/A 77 Rate of consumption by maximally exposed teen Kg/y N/A N/A N/A 78 Rate of consumption by maximally exposed child Kg/y N/A N/A N/A 79 Average rate of consumption by an adult in local population Kg/y N/A N/A N/A 80 Average rate of consumption by a teen in local population Kg/y N/A N/A N/A 81 Average rate of consumption by a child in local population Kg/y N/A N/A N/A 82 Holdup time between harvest and consumption by average Hr N/A N/A N/A Response to NRC Questions Received during May 11, 2011 Public Meeting Request For Additional Information E1-17 Table II.

Item Parameter Units Value Source Assumptions members of population 83 Holdup time between harvest and consumption by maximally exposed members of population Hr N/A N/A N/A 84 Dilution Factor for irrigation water usage location for the current food product N/A N/A N/A 85 Production rate for the current food product using current irrigation water supply Kg/y or L/y N/A N/A N/A 86 Transit time from the release point to the current usage location Hr N/A N/A N/A Items 88-93 (only if dilution factors not given above)

N/A N/A N/A 88 Surface water model N/A N/A N/A 89 Average flow velocity Ft/s N/A N/A N/A 90 Average depth of water body Ft N/A N/A N/A 91 Downshore distance from discharge point to usage location ft.

N/A N/A N/A 92 Offshore, distance to water usage location ft.

N/A N/A N/A 93 Width of river or depth of discharge point in lake ft.

N/A N/A N/A Biota Exposure Location Data: The following data are for calculation of dose to biota WBN does not consider Biota 94 Location identifier N/A N/A N/A 95 Dilution Factor for current exposure location for biota N/A N/A N/A 96 Transit time from the effluent release location to current exposure location hr N/A N/A N/A Include items97-102 following only if no dilution factor was given for biota WBN does not consider Biota 97 Surface water model N/A N/A N/A 98 Average flow velocity Ft/s N/A N/A N/A 99 Average depth of water body Ft N/A N/A N/A 100 Downshore distance from discharge point to usage location ft.

N/A N/A N/A 101 Offshore, distance to water usage location ft.

N/A N/A N/A 102 Width of river or depth of discharge point in lake ft.

N/A N/A N/A Response to Questions Received during May 11, 2011 Public Meeting Request For Additional Information E1-18 Attachment A - 2007 LUS Sector Distance (Meters)

Chi/Q (s/m3)

D/Q (1/m2)

Terrain Adjustment Factor Milk Feeding Factor Nearest Resident N

2134 2.84e-06 4.21e-09 1.50 Nearest Resident NNE 3600 2.69e-06 4.41e-09 1.80 Nearest Resident NE 3353 3.84e-06 3.22e-09 2.20 Nearest Resident ENE 2414 6.26e-06 3.83e-09 1.90 Nearest Resident E

3268 3.97e-06 2.14e-09 1.70 Nearest Resident ESE 4416 2.64e-06 1.46e-09 1.90 Nearest Resident SE 1372 9.66e-06 8.16e-09 1.50 Nearest Resident SSE 1524 4.18e-06 5.56e-09 1.40 Nearest Resident S

1585 3.91e-06 8.42e-09 1.80 Nearest Resident SSW 1979 2.76e-06 6.64e-09 1.90 Nearest Resident SW 4230 1.15e-06 1.43e-09 2.00 Nearest Resident WSW 1829 3.61e-06 4.03e-09 1.70 Nearest Resident W

2896 7.30e-07 6.01e-10 1.10 Nearest Resident WNW 1646 2.26e-06 2.12e-09 2.90 Nearest Resident NW 2061 1.03e-06 9.95e-10 1.50 Nearest Resident NNW 4389 3.50e-07 2.97e-10 1.00 Nearest Garden N

7664 3.13e-07 3.00e-10 1.00 Nearest Garden NNE 6173 1.06e-06 1.42e-09 1.50 Nearest Garden NE 3353 3.84e-06 3.22e-09 2.20 Nearest Garden ENE 4927 2.01e-06 9.39e-10 1.60 Nearest Garden E

6372 1.35e-06 5.42e-10 1.40 Nearest Garden ESE 4758 2.26e-06 1.21e-09 1.80 Nearest Garden SE 4633 1.58e-06 8.97e-10 1.30 Nearest Garden SSE 7454 3.73e-07 2.80e-10 1.10 Nearest Garden S

2254 2.50e-06 4.94e-09 1.90 Nearest Garden SSW 1979 2.76e-06 6.64e-09 1.90 Nearest Garden SW 8100 4.28e-07 4.03e-10 1.80 Nearest Garden WSW 4667 8.70e-07 7.11e-10 1.50 Nearest Garden W

5120 3.03e-07 2.03e-10 1.00 Nearest Garden WNW 5909 1.72e-07 1.05e-10 1.30 Nearest Garden NW 3170 4.13e-07 3.50e-10 1.10 Nearest Garden NNW 4602 3.28e-07 2.74e-10 1.00 Milk Cow ESE 6706 1.35e-06 6.18e-10 1.70 0.65 Milk Cow SSW 2286 2.24e-06 5.20e-09 1.90 0.65 Milk Cow SSW 3353 1.36e-06 2.84e-09 2.00 0.65 Response to Questions Received during May 11, 2011 Public Meeting Request For Additional Information E1-19 Attachment B - Nearest Sector for Site Boundary Sector Distance (Meters)

Chi/Q (s/m3)

D/Q (1/m2)

Terrain Adjustment Factor Unrestricted Area Boundary N

1550 5.12e-06 8.13e-09 1.70 Unrestricted Area Boundary NNE 1980 6.35e-06 1.23e-08 1.80 Unrestricted Area Boundary NE 1580 1.05e-05 1.10e-08 2.10 Unrestricted Area Boundary ENE 1370 1.23e-05 8.77e-09 1.70 Unrestricted Area Boundary E

1280 1.37e-05 9.66e-09 1.60 Unrestricted Area Boundary ESE 1250 1.43e-05 1.16e-08 1.80 Unrestricted Area Boundary SE 1250 1.11e-05 9.49e-09 1.50 Unrestricted Area Boundary SSE 1250 6.04e-06 8.21e-09 1.50 Unrestricted Area Boundary S

1340 5.33e-06 1.17-e08 1.90 Unrestricted Area Boundary SSW 1550 4.14e-06 1.05e-08 2.00 Unrestricted Area Boundary SW 1670 4.46e-06 7.34e-09 2.10 Unrestricted Area Boundary WSW 1430 5.47e-06 6.37e-09 1.80 Unrestricted Area Boundary W

1460 2.11e-06 2.07e-09 1.20 Unrestricted Area Boundary WNW 1400 2.49e-06 2.38e-09 2.50 Unrestricted Area Boundary NW 1400 2.05e-06 2.13e-09 1.70 Unrestricted Area Boundary NNW 1460 2.68e-06 3.08e-09 1.60 Response to Questions Received during May 11, 2011 Public Meeting Request For Additional Information E1-20 Attachment C - 2007 Land Use Survey Environmental Dosimetry Data TLD Station Number Direction degrees Approx Distance miles 1st Qtr 2007 mR/year 2nd Qtr 2007 mR/year 3rd Qtr 2007 mR/year 4th Qtr 2007 mR/year Annual Exposure mR/year N-1 10 1.2 15.7 16.8 12.1 16.1 60.7 N-2 350 4.7 15.8 12.1 13.5 11.2 52.6 NNE-1 21 1.2 15.7 9.3 14.4 15 54.4 NNE-1A 22 1.9 15 8.8 8.4 10.1 42.3 NNE-2 20 4.1 15.3 11.6 10.2 12.9 50 NNE-3 17 10.4 15.7 12.1 7.9 8.5 44.2 NE-1 39 0.9 15.7 12.6 13.5 12.3 54.1 NE-2 54 2.9 15.3 9.8 13 12.3 50.4 NE-3 47 6.1 15.2 6.9 10.2 9.6 41.9 ENE-1 74 0.7 15.7 9.8 14 11.2 50.7 ENE-2 69 5.8 15.3 11.6 12.1 11.8 50.8 ENE-2A 69 3.5 15.2 7.4 8.4 9.6 40.6 ENE-3 56 7.6 15.5 8.8 12.6 9

45.9 E-1 85 1.3 15.5 14

-1 13.9 57.9 E-2 92 5

15.6 14.9 17.7 14.5 62.7 E-3 90 15 15.4 12.6 17.2 14.5 59.7 ESE-1 109 1.2 14.8 8.3 8.8 8

39.9 ESE-2 106 4.4 15.8 14.9 17.7 14.5 62.9 SE-1A 138 0.9 15.1 10.2 9.8 8.5 43.6 SE-2 128 5.3 15.5 10.2 10.7 11.2 47.6 SE-2A 144 3.1 15.2 12.6 10.2 10.7 48.7 SSE-1 146 0.6 15.1 13.1 8.4 11.2 47.8 SSE-1A 161 0.6 15.6 10.2 12.1 12.3 50.2 SSE-2 156 5.8 15.6 10.7 14.9 15.6 56.8 S-1 182 0.7 15.6 9.3 9.3 8.5 42.7 S-2 185 4.8 15.3 8.8 5.1 9.6 38.8 S-2A 177 2

15.3 12.1 13.5 12.9 53.8 S-3 185 6.2 15.2 10.2 10.7 8.5 44.6 SSW-1 199 0.8 15.6 15.9 16.3 16.7 64.5 SSW-2 200 1.3 15.1 9.3 12.6 11.8 48.8 SSW-3 199 5

15.3 10.2 9.8 9.6 44.9 SW-1 226 0.8 15.6 16.8 12.6 18.8 63.8 SW-2 220 5.3 15.3 10.2 11.2 13.4 50.1 SW-3 225 15 15.2 9.3 10.2 10.1 44.8 WSW-1 255 0.9 15.6 10.2 11.2 15 52 WSW-2 247 4

15.2 13.1 13.5 16.1 57.9 W-1 270 0.9 15.6 13.5 13 8.5 50.6 Response to Questions Received during May 11, 2011 Public Meeting Request For Additional Information E1-21 Attachment C - 2007 Land Use Survey Environmental Dosimetry Data (continued)

TLD Station Number Direction degrees Approx Distance miles 1st Qtr 2007 mR/year 2nd Qtr 2007 mR/year 3rd Qtr 2007 mR/year 4th Qtr 2007 mR/year Annual Exposure mR/year W-2 277 4.8 15.3 10.2 8.8 9

43.3 W-2A 268 3.2 15.4 10.7 11.2 8

45.3 WNW-1 294 0.9 15.9 19.2 19.6 15 69.7 WNW-2 292 4.9 15.5 16.3 18.2 17.2 67.2 NW-1 320 1.1 15.8 11.6 12.1 13.9 53.4 NW-2 313 4.7 15.5 12.6 15.8 13.4 57.3 NW-2A 321 3

15.7 7.9 11.6 6.3 41.5 NW-3 317 7

15.6 13.1 14.4 15 58.1 NNW-1 340 1

15.6 12.1 9.8 12.3 49.8 NNW-2 333 4.5 15.7 11.2 12.1 10.1 49.1 NNW-3 329 7

15.6 7.9 7.9 7.4 38.8 NNW-4 337 15 15.6 9.8 8.8 8.5 42.7 Response to Questions Received during May 11, 2011 Public Meeting Request For Additional Information E1-22 Attachment D Absolute Humidity TVAs Offsite Dose Calculation manuals include absolute humidity in the denominators of equations for ingestion dose factors. An estimated value of 9 grams per cubic meter is used based on the calculations performed for Browns Ferry and Sequoyah. The methodology used to determine the absolute humidity is examined in the following study.

Absolute humidity (H) is the ratio of the mass of water vapor present to the volume occupied by the mixture: that is the density of the water vapor component. (Glossary of Meteorology) Absolute humidity is not directly measured, but must be calculated from those variables which are measured by TVA. TVA measures the temperature (T) and dewpoint (Td) at 10m at each nuclear plant. In the 1970s and early 1980s TVA also measured the barometric pressure.

Response to Questions Received during May 11, 2011 Public Meeting Request For Additional Information E1-23 Attachment E Liquid Effluent Source Term Nuclide LRW Ci SGB Ci Total Released Ci Br-84 1.65E-04 5.23E-04 6.88E-04 I-131 2.63E-02 1.14E+00 1.16E+00 I-132 1.32E-02 1.08E-01 1.21E-01 I-133 5.29E-02 8.57E-01 9.10E-01 I-134 6.26E-03 2.65E-02 3.28E-02 I-135 4.75E-02 4.22E-01 4.70E-01 Rb-88 6.89E-03 7.84E-04 7.68E-03 Cs-134 2.93E-02 1.68E-01 1.98E-01 Cs-136 2.55E-03 1.72E-02 1.98E-02 Cs-137 4.03E-02 2.21E-01 2.61E-01 Na-24 1.86E-02 0.00E+00 1.86E-02 Cr-51 7.03E-03 9.27E-02 9.98E-02 Mn-54 4.99E-03 5.10E-02 5.59E-02 Fe-55 8.09E-03 0.00E+00 8.09E-03 Fe-59 2.42E-03 9.05E-03 1.15E-02 Co-58 2.20E-02 1.44E-01 1.66E-01 Co-60 1.44E-02 1.72E-02 3.16E-02 Zn-65 3.82E-04 0.00E+00 3.82E-04 Sr-89 1.92E-04 4.33E-03 4.52E-03 Sr-90 2.20E-05 3.88E-04 4.10E-04 Sr-91 2.84E-04 2.18E-03 2.47E-03 Y-91m 1.68E-04 0.00E+00 1.68E-04 Y-91 9.00E-05 3.00E-04 3.90E-04 Y-93 1.27E-03 0.00E+00 1.27E-03 Zr-95 1.39E-03 1.20E-02 1.34E-02 Nb-95 2.10E-03 8.98E-03 1.11E-02 Mo-99 4.20E-03 9.95E-02 1.04E-01 Tc-99m 3.35E-03 0.00E+00 3.35E-03 Ru-103 5.88E-03 0.00E+00 5.88E-03 Ru-106 7.63E-02 0.00E+00 7.63E-02 Te-129m 1.41E-04 0.00E+00 1.41E-04 Te-129 7.30E-04 0.00E+00 7.30E-04 Te-131m 8.05E-04 0.00E+00 8.05E-04 Te-131 2.03E-04 0.00E+00 2.03E-04 Te-132 1.11E-03 2.93E-02 3.05E-02 Ba-140 1.02E-02 3.48E-01 3.58E-01 La-140 1.62E-02 4.98E-01 5.14E-01 Ce-141 3.41E-04 0.00E+00 3.41E-04 Ce-143 1.53E-03 0.00E+00 1.53E-03 Ce-144 6.84E-03 1.26E-01 1.33E-01 Np-239 1.37E-03 0.00E+00 1.37E-03 H-3 1.25E+03 0.00E+00 1.25E+03 Unplanned 1.60E-01 0.00E+00 1.60E-01 Response to Questions Received during May 11, 2011 Public Meeting Request For Additional Information E1-24 Attachment E Liquid Effluent Source Term Nuclide LRW Ci SGB Ci Total Released Ci Totals w/o H-3 4.4020E+00 4.8400E+00 Total w/unplanned 5.0000E+00 Totals w H-3 1.2576E+03 Total w/unplanned 1.2578E+03 Response to Questions Received during May 11, 2011 Public Meeting Request For Additional Information E1-25 Attachment F Shoreline Data For WBN, the dilution factor (Mp/F) is replaced by the near field dilution factor (DNF) as described below; DNF = 1/0.1 RF (for receptors upstream of TRM 510.0)

DNF = 1/RF (for receptors downstream of TRM 510.0) where: RF = 28,000 cfs 0.1 = the fraction of river flow available for dilution in the near field TRM 510 is the point at which the effluent is considered to be fully mixed with the river flow.

Name Beginning TRM Ending TRM Size Estimated 2040 Recreation Estimated 2040 Recreation (acres)

(visits/year)

(usage person hours)

Chickamauga Reservoir (from WBN to 100 percent mixing point) 528 510 4799 120,986 6.0E5 Chickamauga Reservoir (from 100 percent mixing point to SQN) 510 484 22101 1,297,880 6.5E6 Chickamauga Reservoir (from SQN to Chickamauga Dam) 484 471 9889 7,421,905 3.7E7 Nickajack Reservoir (from Chickamauga Dam to WBN 50-mile radius) 471 460 1799 284,000 1.4E6 Response to Questions Received during May 11, 2011 Public Meeting Request For Additional Information E1-26 Attachment G Public Water Supply Data For WBN, the dilution factor (Mp/F) is replaced by the near field dilution factor (DNF) as described below; DNF = 1/0.1 RF (for receptors upstream of TRM 510.0)

DNF = 1/RF (for receptors downstream of TRM 510.0) where: RF = 28,000 cfs 0.1 = the fraction of river flow available for dilution in the near field TRM 510 is the point at which the effluent is considered to be fully mixed with the river flow.

Name TRM Estimated 2040 Population Dayton, Tenn.

504 19,170 Soddy-Daisy/Falling Water Utility District 487 11,452 East Side Utility, Tenn.

473 49,700 Chattanooga, Tenn.

465 237,048 Response to Questions Received during May 11, 2011 Public Meeting Request For Additional Information E1-27 Sources

1. NUREG-0133, "Preparation of Radiological Effluent Technical Specifications for Nuclear Power Plants," September 1978.

2. Regulatory Guide 1.109, "Calculation of Annual Doses to Man from Routine Releases of Reactor Effluents for the Purpose of Evaluating Compliance with 10 CFR Part 50, Appendix I," Revision 1, October 1977.

3. Regulatory Guide 1.111, "Methods for Estimating Atmospheric Transport and Dispersion of Gaseous Effluents in Routine Releases from Light-Water-Cooled Reactors," Revision 1, July 1977.

4. Regulatory Guide 1.113, "Estimating Aquatic Dispersion of Effluents from Accidental and Routine Reactor Releases for the Purpose of Implementing 10 CFR Part 50 Appendix I," Revision 1, April 1977.

5. TVA Memorandum, Edwin M. Scott to Betsy Eiford-Lee, "Fish Harvest Estimates for the Revision of the QWATA Computer Code," December 15, 1987.

6. NUREG/CR-1004, "A Statistical Analysis of Selected Parameters for Predicting Food Chain Transport and Internal Dose of Radionuclides," October 1979.

7. NUREG-0017 R1 Calculation of Releases of Radioactive Materials in Gaseous and Liquid Effluents from Pressurized Water Reactors.

8. TVA Memorandum, E. E. Driver to R. B. Maxwell, "Watts Bar Nuclear Plant Dispersion," December 3, 1984.

X/Q and D/Q Information From the Site to a Radius of 50 Miles.

E2-1 provides a table of the X/Q and D/Q data for each of the 16 cardinal compass points out to 50 miles. Attachment 2 provides tables of the joint frequency distributions to be used in conjunction with the Attachment 1 data. The information provided is used for the determination of doses to the public in both the FSAR Chapter 11 routine releases and in the values provided in the Final Supplemental Environmental Impact Statement. The methodology used to develop this information was described in Reference 2.

Average Annual X/Qs and D/Qs Out to 50 Miles E2-A1-1 X/Qs Sector 1305 (m) 2414 (m) 4023 (m) 5633 (m) 7242 (m) 12070 (m) 24140 (m) 40234 (m) 56327 (m) 72420 (m)

N 3.92E-06 1.59E-06 7.65E-07 4.78E-07 3.39E-07 1.68E-07 6.69E-08 3.42E-08 2.22E-08 1.61E-08 NNE 6.54E-06 2.65E-06 1.28E-06 7.99E-07 5.65E-07 2.81E-07 1.12E-07 5.72E-08 3.71E-08 2.69E-08 NE 6.66E-06 2.76E-06 1.36E-06 8.61E-07 6.14E-07 3.10E-07 1.25E-07 6.47E-08 4.22E-08 3.07E-08 ENE 7.79E-06 3.29E-06 1.65E-06 1.05E-06 7.58E-07 3.87E-07 1.58E-07 8.23E-08 5.39E-08 3.94E-08 E

8.32E-06 3.53E-06 1.77E-06 1.13E-06 8.14E-07 4.16E-07 1.70E-07 8.87E-08 5.81E-08 4.28E-08 ESE 7.45E-06 3.15E-06 1.57E-06 1.00E-06 7.19E-07 3.67E-07 1.49E-07 7.79E-08 5.10E-08 3.73E-08 SE 6.94E-06 2.94E-06 1.47E-06 9.38E-07 6.73E-07 3.43E-07 1.40E-07 7.30E-08 4.78E-08 3.50E-08 SSE 3.77E-06 1.57E-06 7.78E-07 4.93E-07 3.52E-07 1.78E-07 7.20E-08 3.73E-08 2.44E-08 1.77E-08 S

2.92E-06 1.19E-06 5.77E-07 3.61E-07 2.56E-07 1.28E-07 5.08E-08 2.60E-08 1.69E-08 1.22E-08 SSW 2.70E-06 1.09E-06 5.26E-07 3.29E-07 2.33E-07 1.16E-07 4.57E-08 2.34E-08 1.51E-08 1.09E-08 SW 3.09E-06 1.26E-06 6.17E-07 3.89E-07 2.77E-07 1.39E-07 5.55E-08 2.86E-08 1.86E-08 1.35E-08 WSW 3.50E-06 1.45E-06 7.12E-07 4.50E-07 3.21E-07 1.62E-07 6.52E-08 3.37E-08 2.20E-08 1.60E-08 W

2.09E-06 8.59E-07 4.22E-07 2.67E-07 1.90E-07 9.56E-08 3.85E-08 1.99E-08 1.29E-08 9.40E-09 WNW 1.11E-06 4.56E-07 2.24E-07 1.41E-07 1.01E-07 5.05E-08 2.03E-08 1.05E-08 6.81E-09 4.95E-09 NW 1.34E-06 5.51E-07 2.70E-07 1.70E-07 1.21E-07 6.10E-08 2.45E-08 1.26E-08 8.20E-09 5.96E-09 NNW 1.99E-06 8.12E-07 3.95E-07 2.48E-07 1.76E-07 8.82E-08 3.52E-08 1.81E-08 1.18E-08 8.52E-09 D/Qs Sector 1305 (m) 2414 (m) 4023 (m) 5633 (m) 7242 (m) 12070 (m) 24140 (m) 40234 (m) 56327 (m) 72420 (m)

N 6.32E-09 2.28E-09 9.45E-10 5.22E-10 3.32E-10 1.37E-10 4.18E-11 1.71E-11 9.24E-12 5.61E-12 NNE 1.35E-08 4.87E-09 2.02E-09 1.12E-09 7.10E-10 2.92E-10 8.94E-11 3.65E-11 1.98E-11 1.20E-11 NE 7.13E-09 2.57E-09 1.07E-09 5.89E-10 3.74E-10 1.54E-10 4.72E-11 1.92E-11 1.04E-11 6.33E-12 ENE 5.58E-09 2.01E-09 8.35E-10 4.61E-10 2.93E-10 1.21E-10 3.70E-11 1.51E-11 8.17E-12 4.96E-12 E

5.85E-09 2.11E-09 8.76E-10 4.84E-10 3.08E-10 1.27E-10 3.88E-11 1.58E-11 8.57E-12 5.20E-12 ESE 6.02E-09 2.17E-09 9.01E-10 4.98E-10 3.17E-10 1.30E-10 3.99E-11 1.63E-11 8.82E-12 5.35E-12 SE 5.90E-09 2.13E-09 8.82E-10 4.87E-10 3.10E-10 1.28E-10 3.91E-11 1.59E-11 8.63E-12 5.24E-12 SSE 5.11E-09 1.84E-09 7.64E-10 4.22E-10 2.68E-10 1.10E-10 3.38E-11 1.38E-11 7.47E-12 4.54E-12 S

6.41E-09 2.31E-09 9.59E-10 5.29E-10 3.37E-10 1.39E-10 4.24E-11 1.73E-11 9.38E-12 5.69E-12 SSW 6.91E-09 2.49E-09 1.03E-09 5.71E-10 3.63E-10 1.50E-10 4.58E-11 1.87E-11 1.01E-11 6.14E-12 SW 5.21E-09 1.88E-09 7.80E-10 4.31E-10 2.74E-10 1.13E-10 3.45E-11 1.41E-11 7.63E-12 4.63E-12 WSW 4.10E-09 1.48E-09 6.14E-10 3.39E-10 2.16E-10 8.88E-11 2.72E-11 1.11E-11 6.01E-12 3.65E-12 W

2.07E-09 7.45E-10 3.09E-10 1.71E-10 1.09E-11 4.47E-11 1.37E-11 5.58E-12 3.02E-12 1.83E-12 WNW 1.06E-09 3.84E-10 1.59E-10 8.79E-11 5.59E-11 2.30E-11 7.05E-12 2.87E-12 1.56E-12 9.46E-13 NW 1.41E-09 5.07E-10 2.10E-10 1.16E-10 7.39E-11 3.04E-11 9.31E-12 3.87E-12 2.06E-12 1.25E-12 NNW 2.31E-09 8.34E-10 3.46E-10 1.91E-10 1.21E-10 5.00E-11 1.53E-11 6.24E-12 3.38E-12 2.05E-12 Joint Percentage Frequencies of Wind Direction and Wind Speed for Difference Stability Classes E2-A2-1 STABILITY CLASS A (DELTA T<=-1.9 C/100 M)

Watts Bar Nuclear Plant JAN 1, 1986 - DEC 31, 2005 WIND SPEED (MPH)

WIND DIRECTION CALM 0.6-1.4 1.5-3.4 3.5-5.4 5.5-7.4 7.5-12.4 12.5-18.4 18.5-24.4 >=24.5 TOTAL N 0.000 0.001 0.011 0.052 0.079 0.095 0.005 0.000 0.000 0.244 NNE 0.000 0.001 0.021 0.084 0.124 0.181 0.007 0.000 0.000 0.418 NE 0.000 0.000 0.034 0.100 0.080 0.094 0.000 0.000 0.000 0.308 ENE 0.000 0.000 0.039 0.076 0.045 0.017 0.000 0.000 0.000 0.175 E 0.000 0.000 0.037 0.040 0.010 0.004 0.000 0.000 0.000 0.092 ESE 0.000 0.000 0.017 0.023 0.002 0.001 0.000 0.000 0.000 0.042 SE 0.000 0.001 0.026 0.027 0.005 0.004 0.000 0.000 0.000 0.064 SSE 0.000 0.000 0.049 0.063 0.015 0.011 0.001 0.000 0.000 0.140 S 0.000 0.002 0.070 0.180 0.142 0.121 0.020 0.001 0.000 0.535 SSW 0.000 0.000 0.063 0.371 0.594 0.700 0.049 0.001 0.000 1.778 SW 0.000 0.000 0.029 0.146 0.148 0.065 0.002 0.000 0.000 0.390 WSW 0.000 0.000 0.007 0.020 0.018 0.040 0.006 0.000 0.000 0.091 W 0.000 0.000 0.006 0.007 0.029 0.059 0.007 0.000 0.000 0.108 WNW 0.000 0.000 0.004 0.010 0.011 0.064 0.005 0.000 0.000 0.093 NW 0.000 0.000 0.004 0.007 0.019 0.052 0.005 0.000 0.000 0.087 NNW 0.000 0.000 0.009 0.021 0.038 0.081 0.012 0.000 0.000 0.161 SUBTOTAL 0.001 0.005 0.426 1.226 1.359 1.589 0.119 0.001 0.000 4.725 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 170639 TOTAL HOURS OF STABILITY CLASS A 8030 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS A 7945 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 168144 TOTAL HOURS CALM 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 9.72 METER LEVEL MEAN WIND SPEED = 6.72 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS Joint Percentage Frequencies of Wind Direction and Wind Speed for Difference Stability Classes E2-A2-2 STABILITY CLASS B

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

Watts Bar Nuclear Plant JAN 1, 1986 - DEC 31, 2005 WIND SPEED (MPH)

WIND 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 0.027 0.092 0.084 0.109 0.005 0.000 0.000 0.318 NNE 0.000 0.001 0.039 0.155 0.147 0.212 0.009 0.000 0.000 0.563 NE 0.000 0.000 0.081 0.147 0.090 0.077 0.001 0.000 0.000 0.396 ENE 0.000 0.001 0.058 0.096 0.043 0.010 0.000 0.000 0.000 0.208 E 0.000 0.001 0.046 0.052 0.004 0.002 0.000 0.000 0.000 0.106 ESE 0.000 0.002 0.026 0.022 0.000 0.000 0.000 0.000 0.000 0.051 SE 0.000 0.000 0.039 0.032 0.005 0.002 0.001 0.000 0.000 0.078 SSE 0.000 0.000 0.057 0.035 0.008 0.004 0.000 0.000 0.000 0.104 S 0.000 0.001 0.077 0.148 0.075 0.039 0.014 0.001 0.000 0.354 SSW 0.000 0.001 0.082 0.322 0.266 0.199 0.020 0.000 0.000 0.890 SW 0.000 0.000 0.036 0.169 0.054 0.014 0.001 0.000 0.000 0.275 WSW 0.000 0.000 0.007 0.037 0.015 0.021 0.001 0.000 0.000 0.081 W 0.000 0.000 0.006 0.011 0.025 0.040 0.009 0.000 0.000 0.091 WNW 0.000 0.001 0.005 0.014 0.031 0.079 0.007 0.000 0.000 0.137 NW 0.000 0.000 0.007 0.015 0.033 0.071 0.008 0.000 0.000 0.135 NNW 0.000 0.000 0.011 0.034 0.040 0.079 0.008 0.000 0.000 0.173 SUBTOTAL 0.000 0.007 0.606 1.383 0.923 0.958 0.083 0.001 0.000 3.960 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 170639 TOTAL HOURS OF STABILITY CLASS B 6722 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS B 6659 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 168144 TOTAL HOURS CALM 0 METEOROLOGICAL FACILITY: Watts Bar Nuclear Plant STABILITY BASED ON DELTA-T BETWEEN 9.51 AND 45.63 METERS WIND SPEED AND DIRECTION MEASURED AT 9.72 METER LEVEL MEAN WIND SPEED = 5.98 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS Joint Percentage Frequencies of Wind Direction and Wind Speed for Difference Stability Classes E2-A2-3 STABILITY CLASS C

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

Watts Bar Nuclear Plant JAN 1, 1986 - DEC 31, 2005 WIND SPEED (MPH)

WIND DIRECTION CALM 0.6-1.4 1.5-3.4 3.5-5.4 5.5-7.4 7.5-12.4 12.5-18.4 18.5-24.4 >=24.5 TOTAL N 0.000 0.001 0.060 0.141 0.125 0.151 0.007 0.000 0.000 0.485 NNE 0.000 0.001 0.111 0.224 0.209 0.260 0.013 0.000 0.000 0.817 NE 0.000 0.003 0.139 0.221 0.117 0.070 0.001 0.000 0.000 0.552 ENE 0.000 0.001 0.113 0.127 0.030 0.005 0.001 0.000 0.000 0.277 E 0.000 0.005 0.080 0.049 0.005 0.002 0.000 0.000 0.000 0.140 ESE 0.000 0.003 0.054 0.028 0.002 0.001 0.000 0.000 0.000 0.088 SE 0.000 0.002 0.071 0.033 0.002 0.001 0.000 0.000 0.000 0.109 SSE 0.000 0.002 0.080 0.064 0.009 0.004 0.002 0.000 0.000 0.161 S 0.000 0.001 0.128 0.230 0.085 0.048 0.008 0.001 0.000 0.503 SSW 0.000 0.001 0.152 0.423 0.256 0.177 0.019 0.000 0.000 1.028 SW 0.000 0.001 0.080 0.225 0.070 0.011 0.001 0.000 0.000 0.387 WSW 0.000 0.001 0.023 0.049 0.026 0.015 0.001 0.000 0.000 0.117 W 0.000 0.001 0.016 0.027 0.039 0.042 0.004 0.000 0.000 0.130 WNW 0.000 0.000 0.013 0.030 0.049 0.111 0.010 0.000 0.000 0.214 NW 0.000 0.000 0.020 0.036 0.043 0.096 0.011 0.000 0.000 0.206 NNW 0.000 0.000 0.032 0.059 0.064 0.098 0.011 0.000 0.000 0.264 SUBTOTAL 0.000 0.023 1.171 1.968 1.130 1.093 0.089 0.001 0.000 5.476 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 170639 TOTAL HOURS OF STABILITY CLASS C 9309 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS C 9207 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 168144 TOTAL HOURS CALM 0 METEOROLOGICAL FACILITY: Watts Bar Nuclear Plant STABILITY BASED ON DELTA-T BETWEEN 9.51 AND 45.63 METERS WIND SPEED AND DIRECTION MEASURED AT 9.72 METER LEVEL MEAN WIND SPEED = 5.57 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS Joint Percentage Frequencies of Wind Direction and Wind Speed for Difference Stability Classes E2-A2-4 STABILITY CLASS D

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

Watts Bar Nuclear Plant JAN 1, 1986 - DEC 31, 2005 WIND SPEED (MPH)

WIND 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 0.006 0.050 0.656 0.996 1.063 1.203 0.034 0.000 0.000 4.007 NNE 0.006 0.052 0.697 1.241 1.206 1.182 0.072 0.002 0.000 4.458 NE 0.007 0.064 0.796 1.060 0.477 0.203 0.005 0.000 0.000 2.612 ENE 0.008 0.095 0.840 0.479 0.115 0.038 0.002 0.000 0.000 1.577 E 0.005 0.126 0.478 0.137 0.022 0.005 0.000 0.000 0.000 0.774 ESE 0.003 0.081 0.275 0.057 0.006 0.004 0.000 0.000 0.000 0.426 SE 0.004 0.090 0.369 0.076 0.022 0.014 0.001 0.001 0.000 0.575 SSE 0.006 0.133 0.566 0.160 0.035 0.034 0.014 0.000 0.000 0.949 S 0.011 0.174 1.104 0.699 0.296 0.251 0.076 0.004 0.000 2.615 SSW 0.015 0.145 1.610 1.796 0.927 0.815 0.076 0.002 0.000 5.386 SW 0.010 0.167 1.060 0.790 0.202 0.097 0.004 0.000 0.000 2.329 WSW 0.006 0.109 0.558 0.289 0.123 0.088 0.004 0.000 0.000 1.177 W 0.005 0.121 0.406 0.293 0.258 0.256 0.008 0.000 0.000 1.347 WNW 0.004 0.095 0.353 0.394 0.491 0.520 0.021 0.000 0.000 1.879 NW 0.004 0.071 0.353 0.403 0.532 0.608 0.046 0.001 0.000 2.017 NNW 0.004 0.042 0.445 0.566 0.631 0.795 0.034 0.000 0.000 2.517 SUBTOTAL 0.104 1.615 10.566 9.436 6.405 6.113 0.395 0.010 0.000 34.645 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 170639 TOTAL HOURS OF STABILITY CLASS D 58946 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS D 58253 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 168144 TOTAL HOURS CALM 175 METEOROLOGICAL FACILITY: Watts Bar Nuclear Plant STABILITY BASED ON DELTA-T BETWEEN 9.51 AND 45.63 METERS WIND SPEED AND DIRECTION MEASURED AT 9.72 METER LEVEL MEAN WIND SPEED = 4.96 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS Joint Percentage Frequencies of Wind Direction and Wind Speed for Difference Stability Classes E2-A2-5 STABILITY CLASS E

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

Watts Bar Nuclear Plant JAN 1, 1986 - DEC 31, 2005 WIND SPEED (MPH)

WIND 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 0.032 0.156 0.484 0.623 0.300 0.062 0.002 0.000 0.000 1.659 NNE 0.029 0.142 0.431 0.322 0.171 0.047 0.003 0.000 0.000 1.144 NE 0.039 0.169 0.606 0.366 0.068 0.012 0.003 0.000 0.000 1.264 ENE 0.053 0.240 0.813 0.196 0.015 0.004 0.001 0.000 0.000 1.321 E 0.029 0.277 0.310 0.040 0.011 0.003 0.000 0.000 0.000 0.671 ESE 0.014 0.167 0.118 0.024 0.006 0.004 0.001 0.000 0.000 0.333 SE 0.018 0.203 0.149 0.048 0.025 0.017 0.002 0.000 0.000 0.462 SSE 0.032 0.324 0.321 0.083 0.051 0.039 0.007 0.000 0.000 0.856 S 0.077 0.519 1.012 0.415 0.197 0.193 0.041 0.001 0.000 2.454 SSW 0.123 0.604 1.864 1.178 0.645 0.516 0.051 0.000 0.000 4.981 SW 0.101 0.731 1.291 0.307 0.121 0.062 0.002 0.000 0.000 2.616 WSW 0.072 0.736 0.711 0.147 0.087 0.037 0.001 0.000 0.000 1.792 W 0.064 0.698 0.591 0.194 0.083 0.034 0.000 0.000 0.000 1.664 WNW 0.059 0.645 0.537 0.263 0.099 0.037 0.001 0.000 0.000 1.642 NW 0.048 0.461 0.507 0.279 0.108 0.047 0.002 0.001 0.000 1.453 NNW 0.036 0.255 0.457 0.375 0.247 0.092 0.005 0.000 0.000 1.465 SUBTOTAL 0.827 6.326 10.201 4.862 2.234 1.206 0.121 0.002 0.000 25.777 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 170639 TOTAL HOURS OF STABILITY CLASS E 44130 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS E 43343 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 168144 TOTAL HOURS CALM 1390 METEOROLOGICAL FACILITY: Watts Bar Nuclear Plant STABILITY BASED ON DELTA-T BETWEEN 9.51 AND 45.63 METERS WIND SPEED AND DIRECTION MEASURED AT 9.72 METER LEVEL MEAN WIND SPEED = 3.03 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS Joint Percentage Frequencies of Wind Direction and Wind Speed for Difference Stability Classes E2-A2-6 STABILITY CLASS F (1.5< DELTA T<= 4.0 C/100 M)

Watts Bar Nuclear Plant JAN 1, 1986 - DEC 31, 2005 WIND SPEED (MPH)

WIND 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 0.046 0.268 0.181 0.018 0.001 0.001 0.000 0.000 0.000 0.515 NNE 0.038 0.199 0.172 0.016 0.002 0.001 0.000 0.000 0.000 0.429 NE 0.050 0.218 0.266 0.029 0.002 0.000 0.000 0.000 0.000 0.565 ENE 0.064 0.275 0.348 0.032 0.002 0.001 0.000 0.000 0.000 0.721 E 0.033 0.197 0.123 0.005 0.001 0.000 0.000 0.000 0.000 0.358 ESE 0.015 0.121 0.027 0.000 0.000 0.000 0.000 0.000 0.000 0.163 SE 0.016 0.119 0.036 0.004 0.001 0.001 0.000 0.000 0.000 0.176 SSE 0.025 0.177 0.066 0.010 0.001 0.002 0.001 0.000 0.000 0.282 S 0.056 0.313 0.236 0.032 0.004 0.002 0.000 0.000 0.000 0.643 SSW 0.103 0.459 0.547 0.156 0.020 0.004 0.000 0.000 0.000 1.290 SW 0.136 0.698 0.627 0.040 0.006 0.001 0.000 0.000 0.000 1.507 WSW 0.167 0.994 0.639 0.023 0.002 0.001 0.000 0.000 0.000 1.827 W 0.183 1.268 0.522 0.021 0.003 0.001 0.000 0.000 0.000 1.999 WNW 0.177 1.279 0.447 0.029 0.001 0.001 0.000 0.000 0.000 1.933 NW 0.171 1.198 0.472 0.034 0.002 0.001 0.000 0.000 0.000 1.878 NNW 0.080 0.525 0.254 0.036 0.002 0.001 0.000 0.000 0.000 0.897 SUBTOTAL 1.360 8.307 4.963 0.486 0.049 0.016 0.001 0.000 0.000 15.181 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 170639 TOTAL HOURS OF STABILITY CLASS F 26048 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS F 25526 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 168144 TOTAL HOURS CALM 2286 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 = 1.42 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS Joint Percentage Frequencies of Wind Direction and Wind Speed for Difference Stability Classes E2-A2-7 STABILITY CLASS G (DELTA T > 4.0 C/100 M)

Watts Bar Nuclear Plant JAN 1, 1986 - DEC 31, 2005 WIND SPEED (MPH)

WIND 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 0.035 0.221 0.066 0.001 0.000 0.000 0.000 0.000 0.000 0.323 NNE 0.034 0.199 0.077 0.001 0.000 0.000 0.000 0.000 0.000 0.310 NE 0.048 0.271 0.123 0.002 0.000 0.000 0.000 0.000 0.000 0.444 ENE 0.059 0.300 0.188 0.004 0.001 0.000 0.000 0.000 0.000 0.551 E 0.032 0.202 0.058 0.002 0.000 0.000 0.000 0.000 0.000 0.294 ESE 0.016 0.116 0.018 0.000 0.000 0.000 0.000 0.000 0.000 0.151 SE 0.021 0.145 0.023 0.000 0.000 0.000 0.000 0.000 0.000 0.189 SSE 0.025 0.173 0.032 0.001 0.000 0.000 0.000 0.000 0.000 0.231 S 0.036 0.246 0.051 0.002 0.000 0.000 0.000 0.000 0.000 0.335 SSW 0.060 0.367 0.123 0.005 0.001 0.000 0.000 0.000 0.000 0.556 SW 0.096 0.569 0.222 0.002 0.000 0.000 0.000 0.000 0.000 0.889 WSW 0.162 0.916 0.410 0.007 0.000 0.000 0.000 0.000 0.000 1.495 W 0.169 1.036 0.351 0.002 0.000 0.000 0.000 0.000 0.000 1.559 WNW 0.130 0.825 0.240 0.004 0.000 0.000 0.000 0.000 0.000 1.200 NW 0.127 0.751 0.292 0.002 0.000 0.000 0.000 0.000 0.000 1.173 NNW 0.058 0.356 0.120 0.002 0.000 0.000 0.000 0.000 0.000 0.536 SUBTOTAL 1.109 6.695 2.394 0.037 0.001 0.000 0.000 0.000 0.000 10.236 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 170639 TOTAL HOURS OF STABILITY CLASS G 17454 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS G 17211 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 168144 TOTAL HOURS CALM 1864 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 = 1.14 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS List of Commitments E3-1

1.

This information will be added to the Unit 2 FSAR in Amendment 104. [Cover Letter]