RBG-46812, Radioactive Effluent Release Report for January 1, 2007 Through December 31, 2007

Radioactive Effluent Release Report for January 1, 2007 Through December 31, 2007

ML081270529
Person / Time
Site:	River Bend
Issue date:	04/30/2008
From:	Lorfing D Entergy Operations
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
RBF1-08-0054, RBG-46812
Download: ML081270529 (71)

Text

Entergy Operations, Inc.

River Bend Station 5485 U.S. Highway 61 N St. Francisville, LA 70775 Enterga Tel 225381 4157 Fax 225 635 5068 dlorfin@entergy.com David N. Lorfing Manager-Licensing April 30, 2008 U.S. Nuclear Regulatory Commission Document Control Desk 11555 Rockville Pike Rockville, MD 20852-2738

Subject:

Radioactive Effluent Release Report for 2007 River Bend Station - Unit 1 License No. NPF-47 Docket No. 50-458 File Nos.: G9.5, G9.25.1.5 RBG-46812 RBF1-08-0054

Dear Sir or Madam,

Enclosed the River Bend Station (RBS) Annual Radioactive Effluent Release Report for the period January 1, 2007, through December 31, 2007. This report is submitted in accordance with the RBS Technical Specifications, Section 5.6.3.

Should you have any questions regarding the enclosed information, please contact Mr. David Lorfing at (225) 381-4157.

Sincerely, David N. Lorfing DNL/wjf enclosure 1iYi~*4S~

Radioactive Effluent Release Report for 2007 Page 2 of 2 cc: U.S. Nuclear Regulatory Commission (w/o Enclosure)

Region IV 611 Ryan Plaza Drive, Suite 400 Arlington, TX 76011 NRC Resident Inspector (w/o Enclosure)

PO Box 1050 St. Francisville, LA 70775 Mr. Jack Donohew, Project Manager (w/o Enclosure)

U.S. Nuclear Regulatory Commission MS O-8G14 111555 Rockville Pike Rockville, MD 20852-2738

2007 ANNUAL EFFLUENT RELEASE REPORT PREPARED BY:

William H. SW, Jr. / Senior Environmental Specialist K

REVIEWED BY Robert W. Heath / Superintendent - Chemistry REVIEWED BY:

Bradford L.fHouston / Radiation Protection Manager APPROVED BY: W s G a n P O a Eric W. Olson IGeneral Manager Plant Operations'

River Bend Station 2007 Regulatory Guide 1.21 4/15/2007 TABLE OF CONTENTS PAGE I. INTRODUCTION 4 II. SUPPLEMENTAL INFORMATION A. Regulatory Limits 4 B. Effluent Concentration Limits 7 C. Measurements and Approximations of Total Radioactivity 7 D. Batch Releases 9 E. Abnormal Releases 9 F. Estimate of Total Error 9 III. GASEOUS EFFLUENT

SUMMARY

INFORMATION 10 IV. LIQUID EFFLUENT

SUMMARY

INFORMATION 11 V. SOLID WASTE 11 VI. RADIOLOGICAL IMPACT ON MAN 11 VII. METEOROLOGICAL DATA 11 VIII. RADIOACTIVE LIQUID EFFLUENT MONITORING INSTRUMENTATION OPERABILITY 11 IX. RADIOACTIVE GASEOUS EFFLUENT MONITORING INSTRUMENTATION OPERABILITY 12 X. LIQUID HOLDUP TANKS 12 XI. RADIOLOGICAL ENVIRONMENTAL MONITORING 12 XII. LAND USE CENSUS 12 XIII. OFFSITE DOSE CALCULATION MANUAL (ODCM) 12 XIV. MAJOR CHANGES TO RADIOACTIVE LIQUID, GASEOUS AND SOLID WASTE TREATMENT SYSTEMS 13 XV. PROCESS CONTROL PROGRAM (PCP) 13 XVI. INDUSTRY GROUND WATER PROTECTION INITIATIVE (GPI) - FINAL GUIDANCE DOCUMENT OBJECTIVE ANNUAL REPORTING 13 2

River Bend Station 2007 Regulatory Guide 1.21 4/15/2007 TABLES Table IA Gaseous Effluent - Summation of All Releases 14 Table lB Gaseous Effluent - Ground Level Releases 15 Table IC Gaseous Effluent - Ground Level Batch Release 16 Table 11 Gaseous Effluent - Mixed Mode Continuous Releases 17 Table 1E Gaseous Effluent - Mixed Mode Batch Releases 18 Table iF Radioactive Gaseous Waste Sampling and Analysis Program 19 Table 1G Gaseous Dose Summary 20 Table 2A Liquid Effluent - Summation of All Releases 21 Table 2B Liquid Effluent - Continuous Mode 22 Table 2C Liquid Effluent - Batch Mode 23 Table 2D Liquid Batch Information 24 Table 2E Radioactive Liquid Waste Sampling and Analysis Program 25 Table 2F Liquid Dose Summary 26 Table 3 Solid Waste and Irradiated Fuel Shipments 27 Table 4 Assumptions/Parameters for Doses to Member of the Public Inside Site Boundary 30 Table 5 Doses to Members of the Public on Site from Gaseous Releases 31 Table 6 Meteorological Data - Joint Frequency Tables 32 Table 7 Atmospheric Dispersion Factors 65 Table 8 Groundwater Initiative Sample Results 66 3

River Bend Station 2007 Regulatory Guide 1.21 4/15/2007 I. INTRODUCTION This is the annual Radioactive Effluent Release Report for the period of January 1, 2007, through December 31, 2007. This report is submitted in accordance with Technical Specification 5.6.3 of Appendix A to River Bend Station (RBS) License Number NPF-47.

1I. SUPPLEMENTAL INFORMATION A. Regulatory Limits

1. 10CFR50, Appendix I Limits

a. Fission and Activation Gases In accordance with Technical Requirement (TR) 3.11.2.2, the air dose due to noble gases released in gaseous effluent to areas at and beyond the SITE BOUNDARY shall be limited to:

DGammaAir = gamma air dose from radioactive noble gases in millirad (mrad)

II

-3.17E-8 X- Mi (X/Q) Qi < 5 mrads/qtr i=1 < 10 mrads/yr DBeta-Air - beta air dose from radioactive noble gases in millirad (mrad) n 3.17E-8 X Ni (X/Q) Qi < 10 mrads/qtr i=1 < 20 mrads/yr

b. Radioiodines (1-131 & 1-133) and Particulate In accordance with Technical Requirement 3.11.2.3, the dose to a MEMBER OF THE PUBLIC from radioiodines (1-131 and 1-133), tritium (H-3) and all radionuclides in particulate form with half-lives greater than 8 days, in gaseous effluent releases to areas at and beyond the SITE BOUNDARY shall be limited to:

DIsp= Dose in mrem to the organ (-r) for the age group of interest from radioiodine (1-131, 1-133, tritium, and 8 day particulate via the pathway of interest.)

n

= 3.17E-08 (Fo) y- Pi, (X/Q) Qi and I=1 n

= 3.17E-08 (Fo) y- Ri, (D/0) Qi and 4

River Bend Station 2007 Regulatory Guide 1.21 4/15/2007 1=1 nI DT IXI8P < 7.5 mrem/qtr Z=-1 _<15 mrem/yr (above terms defined in the RBS ODCM)

c. Liquid Effluent In accordance with Technical Requirement 3.11.1.2, the dose or dose commitment to a MEMBER OF THE PUBLIC from radioactive materials in liquid effluent released to UNRESTRICTED AREAS shall be limited to:

Di = AiT At Qi (DF) Dw and n

DTOTALt= Z Di, i=1 DTOTALT= Total dose commitment to the organ (T) due to all releases during the desired time interval in mrem and DTOTAL Total Body < 1.5 mrem/qtr

< 3 mrem/yr DTOTAL Any Organ < 5 mrem/qtr

< 10 mrem/yr (above terms defined in RBS ODCM)

2. 40CFR190 Limits In accordance with Technical Requirement 3.11.4, the annual (calendar year) dose or dose commitment to any MEMBER OF THE PUBLIC, due to releases of radioactivity and to radiation from uranium fuel cycle sources, shall be limited to:

_< 25 mrem to the total body or any organ (except the thyroid)

_< 75 mrem to the thyroid

3. Miscellaneous Limits

a. Technical Requirement 3.11.2.1 - Fission and Activation Gases 5

River Bend Station 2007 Regulatory Guide 1.21 4/15/2007 In accordance with Technical Requirement 3.11.2.1, the dose rate due to radioactive materials released in gaseous effluents from the site to areas at and beyond the SITE BOUNDARY shall be less than or equal to 500 millirems/year (mrem/yr) to the total body and less than or equal to 3000 mrem/yr to the skin:

DRTB Dose rate to the total body in mrem/yr n

Z Ki (X/Q) Qi < 500 mrem/yr and i=1 DRSKIN = Dose rate to the skin in mrem/yr n

Y L, + L.1Mi (X/Q) Qi <3000 mrem/yr i= 1 (above terms defined in RBS ODCM)

b. Technical Requirement 3.11.2.1 - Radioiodine (1-131 & 1-133) and Particulate In accordance with Technical Requirement 3.11.2.1, the dose rate due to radioiodines, tritium, and all radionuclides in particulate form with half-lives greater than 8 days released in gaseous effluents from the site to areas at and beyond the SITE BOUNDARY shall be limited to less than or equal to 1500 mrem/yr to any organ:

DRI&8 DP* = Dose rate to the organ t for the age pathway group of interest from Radioiodines (1-131 & 1-133), tritium, and 8 day particulate via the inhalation pathway in mrem/yr.

n Z Pi (X/Q) Qi <1500 mrem/yr i= 1 (above terms defined in RBS ODCM)

c. Technical Requirement 3.11.1.1 - Liquid Effluent In accordance with Technical Requirement 3.11.1.1, the concentration of radioactive material released in liquid effluent to UNRESTRICTED AREAS shall. be limited to ten times the concentrations specified in 10CFR20, Appendix B, Table 2, Column 2 for radionuclides other than dissolved or entrained noble gases. For dissolved or entrained noble gases, the concentration shall be limited to 2.OE-04 6

River Bend Station 2007 Regulatory Guide 1.21 4/15/2007 microcuries/milliliter total concentration.

d. Technical Requirement 3.11.2.5 - Ventilation Exhaust Treatment In accordance with Technical Requirement 3.11.2.5, the VENTILATION EXHAUST TREATMENT SYSTEM shall be used to reduce radioactive materials in gaseous waste prior to their discharge when the projected doses, due to gaseous effluent releases to areas and beyond the SITE BOUNDARY would exceed 0.3 mrem to any organ in a 31-day period.

e. Technical Requirement 3.11.1.3 - Liquid Radwaste Treatment System In accordance with Technical Requirement 3.11.1.3, the liquid radwaste treatment system shall be used to reduce the radioactive materials in liquid waste prior to their discharge When the projected doses, due to the liquid effluent, to UNRESTRICTED AREAS would exceed 0.06 mrem to the total body or 0.2 mrem to any organ in a 31-day period.

B. Effluent Concentration Limits

1. Gaseous Releases The concentrations of radioactive gaseous releases are based on the dose rate restrictions in RBS Technical Requirements, rather than the Effluent Concentration Limits (ECL) listed in 10CFR20 Appendix B, Table 2, Column 1.

2. Liquid Releases The Effluent Concentration Limits of radioactive materials in liquid effluent is limited to ten times, 10CFR20, Appendix B, Table 2, Column 2.

C. Measurements and Approximations of Total Radioactivity

1. Gaseous Effluent

a. Fission and Activation Gases Periodic grab samples are obtained from the Main Plant Exhaust Duct, Fuel Building Exhaust Vent and Radwaste Building Exhaust Vent. These samples are analyzed using high purity germanium detectors coupled to computerized pulse height analyzers. The sampling and analysis frequencies are described in Table iF.

Sampling and analysis of these effluent streams provide noble gas radionuclide relative abundance that can then be applied to 7

River Bend Station 2007 Regulatory Guide 1.21 4/15/2007 the noble gas gross activity and gross activity release rate to obtain nuclide specific activities and release rates. The noble gas gross activity released within a specific time period is determined by integrating the stack monitor release rate over the considered time period. If no activity was detected between the stack grab sample and a significant increase in hourly averages was recorded, the nuclide relative abundance of the last sample (or the last similar event), which indicated the presence of activity, was used to obtain nuclide specific activities. Correction factors for the monitors are derived and applied for each sampling period whenever noble gas radionuclides are detected in the effluent stream.

b. Particulate and Radioiodine (1-131 & 1-133)

Particulates, Iodine-131 and Iodine-133 are continuously sampled from the three release points using a particulate filter and charcoal cartridge in line with a sample pump (stack monitor pump). These filters and charcoal cartridges are removed and analyzed in accordance with the frequencies specified in Table iF. Analysis is performed to identify and quantify radionuclides using high purity germanium detectors coupled to computerized pulse height analyzers. Given the nuclide specific activity concentrations, process flow rate, and duration of the sample, the nuclide specific activity released to the environment can be obtained. Due to the continuous sampling process, it is assumed that the radioactive material is released to the environment at a constant rate within the sampling period. Strontium-89 and Strontium-90 (Sr-89 and Sr-90) are quantitatively analyzed by counting by scintillation techniques (Chrenkov counting).

Gross alpha analysis is performed using a zinc sulfide scintillation counter.

c. Tritium Tritium grab samples are obtained from the three gaseous release points at the specified frequencies listed in Table iF using an ice bath condensation collection method. The collected sample is then analyzed using a Liquid Scintillation Counter. Given the tritium concentration, process flow rate, and time period for which the sample is obtained, the tritium activity released to the environment can be determined. Due to the frequency of sampling, it is assumed that the tritium is released to the environment at a constant rate within the time period for which the sample is obtained.

8

River Bend Station 2007 Regulatory Guide 1.21 4/15/2007

2. Liquid Effluent Representative grab samples are obtained from the appropriate sample recovery tank and analyzed prior to release of the tank in accordance with the frequencies listed in Table 2E. Analysis for gamma emitting nuclides (including dissolved and entrained noble gases) is performed using a high resolution germanium detector coupled to a computerized pulse height analyzer. Tritium concentration is determined using a liquid scintillation counter. Strontium-89 and Strontium-90 are quantitatively analyzed by scintillation techniques (Chrenkov counting).

Iron-55 is counted with a liquid scintillation counter after digestion of the iron. Gross alpha analysis is performed using a zinc sulfide scintillation counter.

Given the nuclide specific activity concentration and total volume of the tank that was released, the activity of each nuclide released to the environment can be determined.

D. Batch Releases Liquid Effluents Batch releases and receiving stream flow from River Bend Station during the reporting period of January 1, 2007, through December 31, 2007 are shown in Table 2D.

The Mississippi River stream flow is obtained by .averaging data from the U. S. Army Corp of Engineers website using flow gauge data at Tarbert Landing.

Gaseous Effluents There were no batch releases of gaseous effluents from River Bend Station during the reporting period of January 1, 2007, through December 31, 2007.

E. Abnormal Releases There were no abnormal liquid or gaseous releases during the reporting period of' January 1, 2007, through December 31, 2007.

F. Estimate of Total Error

1. Liquid The maximum error associated with sample collection, laboratory analysis, and discharge volume is collectively estimated to be:

9

River Bend Station 2007 Regulatory Guide 1.21 4/15/2007 Fission and Activation Products  : + 14.2%

Tritium  : + 14.2%

Dissolved and Entrained Noble Gases  : + 14.2%

Gross Alpha Radioactivity  : + 14.2%

2. Gaseous The maximum errors (not including sample line loss) associated with sample flow, process flow, sample collection, monitor accuracy and laboratory analysis are collectively estimated to be:

Noble Gases + 37.0%

lodines + 18.6%

Particulate + 18.6%

Tritium + 18.2%

3. Determination of Total Error The total error (i.e., collective error due to sample collection, laboratory analysis, sample flow, process flow, monitor accuracy, etc.) is calculated using the following equation:

ET -V -((E 1I)-' ý+(E2,)L + -.(En))

where:

ET = total error El, E 2 ... En individual errors due to sample collection, laboratory analysis, sample flow, process flow, monitor accuracy, etc.

III. GASEOUS EFFLUENT

SUMMARY

INFORMATION Refer to the Table 1 series for "Summation of All Releases and "Nuclides Released,"

respectively. It should be noted that an entry of "0.OOE+00" Curie (Ci) or microcurie/second (uCi/sec) in this section indicates that the concentration of the particular radionuclide was below the Lower Limit of Detection (LLD) as listed in Table 1F. Also, any nuclide not appearing in the tables was < LLD for all four quarters.

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River Bend Station 2007 Regulatory Guide 1.21 4/15/2007 IV. LIQUID EFFLUENT

SUMMARY

INFORMATION Refer to the Table 2 series for "Summation of All Releases and Nuclides Released." It should be noted that an entry of "0.OOE+00" Ci or uCi/mI in this section indicates that the concentration of the particular radionuclide was below the Lower Limit of Detection (LLD) as listed in Table 2E. Also, any nuclide not appearing in the tables was < LLD for all four quarters.

V. SOLID WASTE Refer to Table 3, for "Solid Waste and Irradiated Fuel Shipments.

VI. RADIOLOGICAL IMPACT ON MAN (40CFR190)

An assessment (see summary below) was made of radiation doses to the likely most-exposed member of the public from River Bend and other nearby uranium fuel cycle sources (none within five miles). The annual (calendar year) dose or dose commitment to any MEMBER OF THE PUBLIC, due to releases of radioactivity and to radiation from uranium fuel cycle sources, shall be limited to less than or equal to 25 mrem to the total body or any organ, except the thyroid, which shall be limited to less than or equal to 75 torem.

Organ mrem Total Body 1.93E-01 Skin 8.98E-01 Thyroid 2.08E-01 Other Organ 2.92E-01 In addition, an assessment of doses was made for members of the public due to their activities inside the site boundary. Parameters and assumptions used to make this determination can be found in Table 4. The results of the calculations can be found in Table 5. The maximally exposed member of the public was split between the lawn service provider and RBS employees who are staying on site. The lawn service provider dose is conservatively calculated to have performed all work at the Generation Support Building during 2007. The employees staying at RBS during the week are conservatively calculated to have stayed at least four days per week for 38 weeks. It should be noted that liquid effluent pathway dose was not considered since these individuals would not engage in activities that would allow exposure to this pathway.

VII. METEOROLOGICAL DATA See Tables 6 and 7 for the cumulative joint frequency distributions and annual average data for continuous releases. The meteorological recovery for 2007 was 95.5 %.

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River Bend Station 2007 Regulatory Guide 1.21 4/15/2007 VIII. RADIOACTIVE LIQUID EFFLUENT MONITORING INSTRUMENTATION OPERABILITY The minimum number of channels required to be OPERABLE as described in Table 3.3.11.2-1 of Technical Requirement 3.3.11.2 were, if inoperable at any time in the period January 1, 2007, through December 31, 2007, restored to operable status within the required time. Reporting of these inoperable channels in this report is, therefore, not required.

IX. RADIOACTIVE GASEOUS EFFLUENT MONITORING INSTRUMENTATION OPERABILITY The minimum number of channels required to be OPERABLE as described in Table 3.3.11.3-1 of Technical Requirement 3.3.11.3 were, if inoperable at any time' in the period January 1, 2007, through December 31, 2007, restored to operable status within the required time. Reporting of inoperable channels is therefore not required in this report.

X. LIQUID HOLD UP TANKS The maximum quantity of radioactive material, excluding tritium and dissolved or entrained noble gases, contained in any unprotected outdoor tank during the period of January 1, 2007, through December 31, 2007 was less than or equal to the 10 curie limit as required by Technical Specification 5.5.8.b.

XI. RADIOLOGICAL ENVIRONMENTAL MONITORING There were no changes to the Radiological Environmental Monitoring Program during the reporting period January 1, 2007, through December 31, 2007.

XII. LAND USE CENSUS There was no land use census performed for 2007 as this is a biennial surveillance and will next be performed in 2008.

XIII. OFFSITE DOSE CALCULATION MANUAL (ODCM)

There were no changes to the ODCM in 2007.

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River Bend Station 2007 Regulatory Guide 1.21 4/15/2007 XIV. MAJOR CHANGES TO RADIOACTIVE LIQUID, GASEOUS, AND SOLID WASTE TREATMENT SYSTEMS Engineering has performed a review of the IDEAS and IAS database to evaluate design changes completed orpartially completed during 2007 involving the subject systems. These design changes were then reviewed to determine if there have been any major changes to the subject systems. The review was based on a major change being defined as a modification which affected the method of processing or the effluent from the system. Also, to be a "major change" the change must have affected the USAR.

The Engineering Requests (ER's) and Engineering Changes (EC's) completed during this time period primarily consisted of administrative changes, parts equivalencies or approval of alternate parts with enhanced performance characteristics, evaluation of maintenance items such as leak repairs, and evaluation of temporary removal of liquid radwaste. strainer elements. The administrative changes primarily consisted of drawing/document corrections.

Equivalencies or enhanced alternate parts involved replacement level instruments and pump seals. Temporary removal of, the strainer elements was allowed given that an alternate strainer or downstream filtration was in use for liquid radwaste processing. These changes did not modify any radioactive waste system major component such that the processing method or effluent was changed. These changes also had no affect on the method, of processing solid, liquid or gaseous waste and did not affect the isotopic composition or the quantity of liquid, solid, or gaseous waste as described in the USAR.

In conclusion, no design changes were completed during the specified time period that constituted a major change to either liquid, solid or gaseous radwaste treatment systems.

XV. PROCESS CONTROL PROGRAM (PCP)

There were no changes to the PCP in 2007.

XVI. INDUSTRY', GROUND WATER PROTECTION INITIATIVE (GPI) - FINAL GUIDANCE DOCUMENT (NEI 07-07) OBJECTIVE ANNUAL REPORTING Ground water sample results were taken in support of the GPI beginning in the third quarter, 2007. These samples are not part of the REMP program. Five monitoring wells were sampled for gamma radiation and tritium. The Minimum Detectable Activity (MDA) in all samples was less than the Lower Limit of Detection as required in Technical Requirement 3.12.1 (Environmental LLDs). There were no significant spills or leaks in 2007 and no on-site or off-site ground water sample results that exceeded the REMP reporting thresholds in 2007. The sample results are located in Table 8.

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River Bend Station 2007 Regulatory Guide 1.21 4/15/2007 EFFLUENT AND WASTE DISPOSAL REPORT TABLE 1A GASEOUS EFFLUENTS - SUMMATION OF ALL RELEASES REPORT FOR 2007 Units QTR 1 QTR 2 QTR 3 QTR 4 YEAR Fission and Activation Gases

1. Total Release Ci 4. 04E+01 1. 26E+02 9.31E+01 8.39E+01 3.44E+02

2. Avg. Release Rate uCi/sec -5.19E+00 1.61E+01 1. 17E+01 1.06E+01 1.09E+01

3.  % Applicable Limit  % (1) 4. 71E-01 1.03E+00 6.41E-01 1.07E+00 1.61E+00 Iodine-131

1. Total Release Ci 5.14E-03 2.52E-03 2.81E-03 7.61E-03 1.81E-02

2. Avg. Release Rate uCi/sec 6.61E-04 3.20E-04 3. 53E-04 9. 58E-04 5 .73E-04

3.  % Applicable Limit  % (2) 2.20E+00 1.07E+00 1. 20E+00 3.24E+00 3.87E+00 Particulates Half Life >= 8 days

1. Total Release Ci 1. 13E-03 6.16E-04 1. 18E-03 5. 64E-04 3.49E-03

2. Avg. Release Rate uCi/sec 1.45E-04 7.84E-05 1.49E-04 7. l0E-05 1.l1E-04

3.  % Applicable Limit  % (2) 6.09E-01 1.96E-01 2.37E-01 6.41E-01 8.43E-01 Tritium

1. Total Release Ci 4.87E+00 5. 41E+00 4. 63E+00 4. 51E+00 1.94E+01

2. Avg. Release Rate uCi/sec 6.26E-01 6.88E-01 5. 82E-01 5.67E-01 6.16E-01

3.  % Applicable.Limit  % (2) 1.38E-01 1.71E-01 1.l1E-01 1.04E-01 2.62E-01 Gross Alpha Radioactivity

1. Total Release Ci 0. OOE+00 0. OOE+00 0 . OOE+00 0 . OOE+00 0. OOE+00

2. Avg. Release Rate uCi/sec 0. OOE+00 0. OOE+00 0 . OOE+00 0 . OOE+00 0. OOE+00 1 Either the gamma air dose limit of 5 mrads/qtr or beta air dose limit of 10 mrads/qtr (T.R. 3.11.2.2.a), which ever is most limiting.

2) The % of applicable limit is determined by comparing the dose contribution to the critical organ limits of TRM 3.11.2.3 14

River Bend Station 2007 Regulatory Guide 1.21 4/15/2007 EFFLUENT AND WASTE DISPOSAL REPORT TABLE 1B GASEOUS EFFLUENTS - GROUND RELEASES - CONTINUOUS MODE REPORT FOR 2007 Units QTR 1 QTR 2 QTR 3 QTR 4 YEAR Fission and Activation Gases XE-133 Ci 2.49E+00 1. 17E+00 8. 36E-02 5.54E-01 4.30E+00 XE-133M Ci 0. OOE+00 0. OOE+00 0. OOE+00 0.OOE+00 0. OOE+00 XE-135 Ci 4.78E+00 8.09E+00 5. 63E-01 1.30E+01 2.64E+01 XE-135M Ci 1.79E-01 0. OOE+00 0. OOE+00 0.OOE+00 1.79E-01 Totals for Period... Ci 7 . 45E+00 9. 26E+00 6.46E-01 1.35E+01 3 .09E+01 Iodines 1-131 Ci 5.57E-05 2.50E-06 0. OOE+00 9.23E-06 6 .74E-05 1-132 Ci 0. OOE+00 0. OOE+00 0. OOE+00 0 . OOE+00 0. OOE+00 1-133 Ci 4.80E-04 0. OOE+00 0 . OOE+00 4.37E-05 5.24E-04 Totals for Period... Ci 5.36E-04 2 . 50E-06 0 . OOE+00 5. 29E-05 5. 91E-04 Particulates Half Life >= 8 days CE-141 Ci 0. OOE+00 0. OOE+00 0 .OOE+00 0. OOE+00 0. OOE+00 CO-57 Ci 0. OOE+00 0 OOE+00 0 .OOE+00 0. OOE+00 0 OOE+00 CO-58 Ci 0. OOE+00 0 OOE+00 0. OOE+00 0 OOE+00 0 OOE+00 CO-60 Ci 0. OOE+00 0 OOE+00 0 .OOE+00 0 OOE+00 0 OOE+00 CR-51 Ci 0. OOE+00 0 OOE+00 0. OOE+00 0 OOE+00 0 OOE+00 CS-137 Ci 0. OOE+00 0 OOE+00 0. OOE+00 0 OOE+00 0 OOE+00 FE-59 Ci 0. OOE+00 0 OOE+00 0. OOE+00 0 OOE+00 0 OOE+00 MN-54 Ci 2.61E-06 0 OOE+00 0. OOE+00 0 OOE+00 2 .61E-06 NB-95 Ci 0. OOE+00 0 OOE+00 0. OOE+00 0 OOE+00 0 OOE+00 RU-103 Ci 0. OOE+00 0. OOE+00 0. OOE+00 0 OOE+00 0 OOE+00 RU-106 Ci 0. OOE+00 0. OOE+00 0. OOE+00 0. OOE+00 0 OOE+00 ZN-65 Ci 0. OOE+00 0. OOE+00 0. OOE+00 0. OOE+00 0. OOE+00 Totals for Period... Ci 2 .61E-06 0.OOE+00 0.OOE+00 0.OOE+00 2 .61E-06 Tritium H-3 Ci 1. 82E+00 2.33E+00 1.41E+00 1.31E+00 6.87E+00 Totals for Period... Ci 1.82E+00 2. 33E+00 1.41E+00 1. 31E+00 6. 87E+00 Gross Alpha Radioactivity

• • No Nuclide Activities **

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River Bend Station 2007 Regulatory Guide 1.21 4/15/2007 EFFLUENT AND WASTE DISPOSAL REPORT TABLE IC GASEOUS EFFLUENTS - GROUND RELEASES - BATCH MODE REPORT FOR 2007 Units QTR 1 QTR 2 QTR 3 QTR 4 YEAR Fission and Activation Gases XE-133 Ci 0.OOE+00 0.OOE+00 0.OOE+00 0.OOE+00 0.OOE+00 XE-135 Ci 0.OOE+00 0.OOE+00 0.OOE+00 0.OOE+00 0.06E+00 XE-135M Ci 0.OOE+00 0.OOE+/-00 0.OOE+00 0.OOE+00 0.OOE+00 Totals for Period... Ci 0.OOE+00 0.OOE+00 0.OOE+00 0.OOE+00 0.OOE+00 Iodines

• • No Nuclide Activities **

Particulates Half Life >= 8 days CO-60 Ci 0.OOE+00 0.OOE+00 0.OOE+00 0.OOE+00 0.OOE+00 MN-54 Ci 0.OOE+00 0.OOE+00 0.OOE+00 0.OOE+00 0.OOE+00 ZN-65 Ci 0.OOE+00 0.OOE+00 0.OOE+00 0.OOE+00 0.OOE+00 Totals for Period... Ci 0.OOE+00 0.OOE+00 0.OOE+00 0.OOE+00 0.OOE+00 Tritiumx

• • No Nuclide Activities **

16

River Bend Station 2007 Regulatory Guide 1.21 4/15/2007 EFFLUENT AND WASTE DISPOSAL REPORT TABLE ID GASEOUS EFFLUENTS - MIXED MODE RELEASES - CONTINUOUS MODE REPORT FOR 2007 Units QTR 1 QTR 2 QTR 3 QTR 4 YEAR Fission and Activation Gases AR-41 Ci 0. OOE+00 0. OOE+00 0 OOE+00 0. OOE+00 0 OOE+00 KR-85 Ci 0. OOE+00 0. OOE+00 0 OOE+00 0. OOE+00 0 OOE+00 KR-85M Ci 0. 00E+00 2.66E-01 2 .79E-01 4.46E-01 9. 92E-01 KR-87 Ci 0. OOE+00 8.54E-01 5 75E-01 1. 07E+00 2 50E+00 KR-88 Ci 0. OOE+00 6. 25E-01 8 .56E-01 1. 10E+00 2. 59E+00 XE-131M Ci 0. OOE+00 0. OOE+00 0 . OOE+00 0. OOE+00 0. OOE+00 XE-133 Ci 2.40E-01 1. 90E+01 3. 91E+00 2. 15E+0 1 4 .46E+01 XE-133M Ci 0. OOE+00 0. OOE+00 0 . OOE+00 0. OOE+00 0.OOE+00 XE-135 Ci 1.51E+01 5.66E+01 3. 86E+01 2.35E+01 1.34E+02 XE-135M Ci 1. 76E+01 3.50E+01 4 .20E+01 1.63E+01 1. 11E+02 XE-137 Ci 0. OOE+00 0. OOE+00 0 . OOE+00 0 . OOE+00 0. OOE+00 XE-138 Ci 7.72E-02 4. 58E+00 6 27E+00 6.43E+00 1.74E+01 Totals for Period... Ci 3.29E+01 1.17E+02 9.25E+01 7.04E+01 3.13E+02 Iodines 1-131 Ci 5. 08E-03 2.51E-03 2.81E-03 7.60E-03 1.80E-02 1-132 Ci 0. OOE+00 0 . OOE+00 0. OOE+00 0. OOE+00 0. OOE+00 1-133 Ci 4. 92E-02 1.70E-02 2.04E-02 5.51E-02 1.42E-01 1-135 Ci 0.OOE+00 0.OOE+00 0 .OOE+00 0 .OOE+00 0.OOE+00 Totals for Period... Ci 5.43E-02 1.95E-02 2.32E-02 6.27E-02 1.60E-01 Particulates Half Life >= 8 days BA-140 Ci 5 50E-04 2. 11E-04 5.04E-04 2.19E-04 1.48E-03 CE-139 Ci 0 OOE+00 0 OOE+00 0.OOE+00 0 . OOE+00 0. OOE+00 CE-141 Ci 1.38E-05 0 OOE+00 0.OOE+00 0 . OOE+00 1.38E-05 CO-58 Ci 0 OOE+00 0 OOE+00 0 . OOE+00 0 . OOE+00 0. OOE+00 CO-60 Ci 0 OOE+00 0 OOE+00 0.OOE+00 0 . OOE+00 0 OOE+00 CR-51 Ci 0 OOE+00 0 OOE+00 0.OOE+00 0. OOE+00 0 OOE+00 CS-134 Ci 0 OOE+00 0 OOE+00 0. OOE+00 0. OOE+00 0 OOE+00 CS-137 Ci 0 . OOE+00 0 OOE+00 0. OOE+00 0. OOE+00 0. OOE+00 FE-59 Ci 0 . OOE+00 0 OOE+00 0. OOE+00 0. OOE+00 0 OOE+00 MN-54 Ci 0 OOE+00 0 OOE+00 0. OOE+00 0. OOE+00 0 OOE+00 RU-103 Ci 0 OOE+00 0 OOE+00 0. OOE+00 0. OOE+00 0 OOE+00 SR-89 Ci 5. 65E-04 4. 06E-04 6.78E-04 3.45E-04 1.99E-03 SR-90 Ci 7. 67E-08 0 OOE+00 0. OOE+00 0. OOE+00 7. 67E-08 ZN-65 Ci 0 OOE+00 0 OOE+00 0. OOE+00 0.OOE+00 0 OOE+00 Totals for Period... Ci 1.13E-03 6.16E-04 1.18E-03 5.64E-04 3.49E-03 Tritium H-3 Ci 3.05E+00 3.08E+00 3.22E+00 3.20E+00 1.25E+01 Gross Alpha Radioactivity

• • No Nuclide Activities **

17

River Bend Station 2007 Regulatory Guide 1;21 4/15/2007 EFFLUENT AND WASTE DISPOSAL REPORT SUPPLEMENTAL INFORMATION GASEOUS EFFLUENTS - BATCH MODE Table 1E REPORT FOR 2007 Units QTR 1 QTR 2 QTR 3 QTR 4 YEAR Number of releases 0 0 0 0 0 Total release time minutes 0 .OOE+00 0 .OOE+00 0. OOE+00 0. OOE+00 0. OOE+00 Maximum release time minutes 0. OOE+00 0. OOE+00 0. OOE+00 0. OOE+00 0 .OOE+00 Average release time minutes 0. OOE+00 0. OOE+00 0.OOE+00 0 .OOE+00 0. OOE+00 Minimum release time minutes 0 .OOE+00 0. OOE+00 0 . OOE+00 0 .OOE+00 0. OOE+00 18

River Bend Station 2007 Regulatory Guide 1.21 4/15/2007 TABLE iF Effluent and Waste Disposal Annual Report 2007 Year RADIOACTIVE GASEOUS WASTE SAMPLING AND ANALYSIS PROGRAM Gaseous Release Type Sampling Minimum Analysis Type of Activity Lower Limit of' Frequency Frequency Analysis Detection (LLD) uCi/ml A. Main Plant M M Principal Gamma Exhaust Duct Grab Sample Emitters 1.OOE-04 H-3 1.OOE-06 B. Fuel Building M M Principal Gamma Ventilation Grab Sample Emitters 1.OOE-04 Exhaust Duct H-3 1.OOE-06 C. Radwaste M M Principal Gamma Building Grab Sample Emitters 1.00E-04 Ventilation Exhaust Duct D. All Release Continuous W 1-131 1.OOE-12 Types as listed Charcoal Sample in A, B, & C above 1-133 1.OOE-10 Continuous W Principal Gamma Particulate Sample Emitters (1-131, 1.OOE-11 Others)

Continuous M Gross Alpha Composite 1.OOE-I 1 Particulate Sample Continuous 0 Sr-89, Sr-90 Composite 1.OOE-1 1 Particulate Sample Continuous Noble Gas Monitor Noble Gases Gross Beta or Gamma 1.OOE-06 W = At least once per 7 days M = At least once per 31 days Q = At least once per 92 days 19

River Bend Station 2007 Regulatory Guide 1.21 4/15/2007 Table IG GASEOUS DOSE

SUMMARY

Release ,ID: 1 All Gas Release Points Coefficient Type: Historical I&P DOSE LIMIT ANALYSIS Age Dose Limit Max % of Period-Limit Group Organ (mrem) (mrem) Limit Q1 - T.Spec Any Organ CHILD THYROID 2.24E-01 7.50E+00 2.99E+00 Q2 - T.Spec Any Organ CHILD THYROID 1.08E-01 7.50E+00 1.44E+00 Q3 - T.Spec Any Organ CHILD THYROID 1.16E-01 7.50E+00 1.54E+00 Q4 - T.Spec Any Organ CHILD THYROID 2.99E-01 7.50E+00 3.99E+00 Yr - T.Spec Any Organ CHILD THYROID 7.47E-01 1.50E+01 4.98E+00 NOBLE GAS DOSE LIMIT ANALYSIS Dose Limit  %-of Period-Limit (mrad) (mrad) Limit Q1 - T.Spec Gamma 2.35E-02 5.OOE+00 4.71E-01 Q2 - T.Spec Gamma 5.17E-02 5.OOE+00 1.03E+00 Q3 - T.Spec Gamma 3.20E-02 5.OOE+00 6.41E-01 Q4 - T.Spec Gamma 5.36E-02 5.OOE+00 1.07E+00 Yr - T.Spec Gamma 1.61E-01 1.OOE+01 1.61E+00 Qi T.Spec Beta 2.47E-02 1.OOE+01 2.47E-01 Q2 T.Spec Beta 5. 1 1E-02 1.OOE+01 5. 11E-01 Q3 T.Spec Beta 1.97E-02 1.OOE+01 1.97E-01 Q4 T.Spec Beta 5.79E-02 1.OOE+01 5.79E-01 Yr T.Spec Beta 1.53E-01 2 .OOE+01 7.67E-01 20

River Bend Station 2007 Regulatory Guide 1.21 4/15/2007 EFFLUENT AND WASTE DISPOSAL REPORT TABLE 2A LIQUID EFFLUENTS - SUMMATION OF ALL RELEASES REPORT FOR 2007 Units QTR 1 QTR 2 QTR 3 QTR 4 YEAR Fission and Activation Gases

1. Total Release Ci 9.07E-04 4 .85E-04 2.20E-03 2.44E-03 6 .02E-03

2. Avg. Diluted Conc. uCi/ml 5.96E-10 3.64E-10 1.61E-09 1. 78E-09 1.08E-09

3.  % Applicable Limit  % (1) 5. 03E-04 1.40E-03 2.66E-03 9.28E-03 1.25E-02 Tritium

1. Total Release Ci 1.80E+01 3.64E+01 4.64E+01 3.01E+01 1.31E+02

2. Avg. Diluted Conc. uCi/ml 1. 18E-05 2.74E-05 3.40E-05 2.20E-05 2.35E-05

3.  % Applicable Limit  % (1) 1.43E-04 8.18E-04 1 . 88E-03 8 .69E-04 3.20E-03 Dissolved and Entrained Gases

1. Total Release Ci 2 . 83E-02 9.43E-02 1.97E-01 1.45E-01 4.64E-01

2. Avg. Diluted Conc. uCi/ml 1. 86E-08 7.08E-08 1.45E-07 1.06E-07 8.32E-08

3.  % Applicable Limit % (2) 9.31E-03 3.55E-02 7.24E-02 5.33E-02 4.17E-02 Gross Alpha Radioactivity

1. Total Release Ci 0.OOE+00 0.OOE+00 0.OOE+00 0.OOE+00 0.OOE+00 Volume of liquid waste liters 8.48E+05 2.04E+06 3.78E+06 2.75E+06 9.41E+06 Volume of dil. water liters 1. 52E+09 1. 33E+09 1.36E+09 1.36E+09 5. 57E+09 (1) The most limiting dose compared to the total body and critical organ limits of TRM 3.11.1.2.a.

(2) Technical Requirement 3.11.1.1 limit of 2.OOE-04 uCi/ml for dissolved and entrained noble gases in liquid effluent.

21

River Bend Station 2007 Regulatory Guide 1.21 4/15/2007 EFFLUENT AND WASTE DISPOSAL REPORT TABLE 2B LIQUID EFFLUENTS - CONTINUOUS MODE REPORT FOR 2007 Units. QTR 1 QTR 2 QTR 3 QTR 4 YEAR Fission and Activation Products

• • No Nuclide Activities **

Tritium

• • No Nuclide Activities **

Dissolved and Entrained Gases

• • No Nuclide Activities **

Gross Alpha Radioactivity

• • No Nuclide Activities **

22

River Bend Station 2007 Regulatory Guide 1.21 4/15/2007 EFFLUENT AND WASTE DISPOSAL REPORT TABLE 2C LIQUID EFFLUENTS - BATCH MODE REPORT FOR 2007 Units QTR 1 QTR 2 QTR 3 QTR 4 YEAR Fission and Activation Gases CE-141 Ci 0 .OOE+00 0. OOE+00 0 OOE+00 1. lIE-05 1.lIE-05 CO-58 Ci 0. OOE+00 0. OOE+00 0 . OOE+00 1.68E-05 1.68E-05 CO-60 Ci 2.28E-04 4. 1OE-04 6. 07E-04 1. 18E-03 2.43E-03 CR-51 Ci 0. OOE+00 0. OOE+00 0 . OOE+00 2.41E-04 2.41E-04 FE-55 Ci 5.93E-04 0. OOE+00 1. 51E-03 0. OOE+00 2. 1OE-03 LA-140 Ci 1.09E-05 0. OOE+00 0 OOE+00 1. 12E-04 1.23E-04 MN-54 Ci 7.50E-05 7.45E-05 7. 1 1E-05 3. 82E-04 6.02E-04 MO-99 Ci 2 23E-07 0. OOE+00 0 OOE+00 2. 48E-07 4.70E-07 NA-24 Ci 6. 37E-07 0. OOE+00 0 OOE+00 0 OOE+00 6.37E-07 N3-97 Ci 0 OOE+00 0. OOE+00 0 OOE+00 1. 56E-05 1.56E-05 NP-239 Ci 0 OOE+00 0 . OOE+00 0 OOE+00 3. 87E-04 3 .87E-04 RU-103 Ci 0 OOE+00 0.OOE+00 0 OOE+00 6. 72E-06 6.72E-06 SR-92 Ci 0 OOE+00 0.OOE+00 6. 81E-06 0 OOE+00 6.81E-06 TC-99M Ci 2 40E-07 0.OOE+00 0 . OOE+00 2. 84E-07 5.24E-07 Y-92 Ci 0 .OOE+00 0. OOE+00 0.OOE+00 8.19E-05 8. 19E-05 Totals for Period... Ci 9.07E-04 4.85E-04 2.20E-03 2.44E-03 6.02E-03 Tritium H-3 Ci 1.80E+01 3.64E+01 4.64E+01 3.01E+01 1.31E+02 Dissolved and Entrained Gases XE-133 Ci 9.65E-03 2.95E-02 4.OOE-02 5.30E-02 1.32E-01 XE-133M Ci 3.10E-04 1.10E-03 3.58E-04 1.89E-03 3.66E-03 XE-135 Ci 1.84E-02 6.36E-02 1.57E-01 9.OOE-02 3.29E-01 XE-135M Ci 1.43E-05 0.OOE+00 0.OOE+00 0.OOE+00 1.43E-05 Totals for Period... Ci 2.83E-02 9.43E-02 1.97E-01 1.45E-01 4.64E-01 Gross Alpha Radioactivity

• • No Nuclide Activities **

23

River Bend Station 2007 Regulatory Guide 1.21 4/15/2007 EFFLUENT AND WASTE DISPOSAL REPORT SUPPLEMENTAL INFORMATION LIQUID EFFLUENTS - BATCH MODE Table 2D REPORT FOR 2007 Units QTR 1 QTR 2 QTR 3 QTR 4 YEAR Number of releases 16 37 69 50 172 Total release time minutes 5.30E+03 1.30E+04 2.41E+04 1 . 72E+04 5.97E+04 Maximum release time minutes 3 . 66E+02 3 . 90E+02 3.90E+02 3.88E+02 3.90E+02 Average release time minutes 3 .31E+02 3. 52E+02 3 .49E+02 3. 44E+02 3. 47E+02 Minimum release time minutes 1. 05E+02 2 . 55E+02 1.98E+02 7. 50E+01 7 .50E+01 OTR I OTR 2 OTR 3 OTR 4 Average Mississippi River stream flow 3

during periods of ft /sec 634,744 555,934 358,272 275,413 release of effluent into a flowing stream 24

River Bend Station 2007 Regulatory Guide 1.21 4/1'5/2007 TABLE 2E Effluent and Waste Disposal Annual Report 2007 Year C

RADIOACTIVE LIQUID WASTE SAMPLING AND ANALYSIS PROGRAM Liquid Release Type Sampling Minimum Analysis Type of Activity Lower Limit of Frequency Frequency Analysis 'Detection (LLD) uCi/ml A. BatchrrWaste P P Principal Gamma 5.00E-07 Release (Liquid Each Batch Each Batch Emitters: except Radwaste for Ce-144 5.OOE-06 Recovery Sample Tanks) 1-131 1.OOE-06 P M Dissolved and One Batch/M Entrained Gases 1.OOE05 (Gamma Emitters)

P M H-3 1.OOE-05 Each Batch Composite Gross Alpha 1.OOE-07 P Q Sr-89, Sr-90 5.OOE-08 Each Batch Composite Fe-55 1.OOE-06 P = Prior to each radioactive release M = At least once per 31 days Q = At least once per 92 days 25

River Bend Station 2007 Regulatory Guide 1.21 4/15/2007 Table 2F LIQUID DOSE

SUMMARY

Report for: 2007 Release ID: 10 All Liquid Release Points Liquid Receptor SITE DOSE LIMIT ANALYSIS-----------

Age Dose Limit Max % of Period - Limit Group Organ (mrem) (mrem) Limit Qtr 1 - T.Spec Any Organ ADULT GILLI 2.73E-05 5 .OOE+00 5.46E-04 Qtr 2 - T.Spec Any Organ ADULT GILLI 8.22E-05 5. OOE+00 1.64E-03 Qtr 3 - T.Spec Any Organ ADULT GILLI 1.61E-04 5. OOE+00 3.21E-03 Qtr 4 - T.Spec Any Organ ADULT GILLI 4.77E-04 5.0 0E+00 9 . 55E-03 2007 - T.Spec Any Organ ADULT GILLI 6.75E-04 1.OOE+01 6.75E-03 Qtr 1 - T.Spec Total Body ADULT TBODY 3.94E-06 1.50E+00 2.63E-04 Qtr 2 - T.Spec Total Body ADULT TBODY 1.69E-05 1 . 50E+00 1. 12E-03 Qtr 3 - T.Spec Total Body ADULT TBODY 3.96E-05 1.50E+00 2.64E-03 Qtr 4 - T.Spec Total Body ADULT TBODY 4.19E-05 1 . 50E+00 2.80E-03 2007 - T.Spec Total Body ADULT TBODY 9.OOE-05 3 . OOE+00 3. OOE-03 26

River Bend Station 2007 Regulatory Guide 1.21 4/15/2007 TABLE 3 Effluent and Waste Disposal Annual Report 2007 Year Solid Waste and Irradiated Fuel Shipments Reporting Period from 01/01/07 to 12/31/07 A. Solid Waste Shipped for Burial or Disposal (Not Irradiated Fuel)

1. Type of Waste Units 12 Month Waste Class Estimated Period Error %

Spent Resins, Filter m3 1.79E+02 A See Below Sludges, Evaporator Ci 6.23E+02 A See Below Bottoms, etc. m3 O.OOE+00 B See Below Ci O.OOE+00 B See Below m3 1.49E+00 C See Below Ci 4.55E+02 C See Below Dry Compressible m3 6.20E+02 A See Below Wastes, Contaminated Equipment, Etc. Ci 7.91E+00 A See Below Irradiated Components, m3 1.OOE-03 C N/A Control Rods, etc. Ci 3.89E+00 C N/A Other (Water, EHC, m3 2.05E+01 A See Below Waste Oil) Ci 4.06E+00 A See Below Note: Volume considered being the total disposal volume of the container.

Radwaste Estimated Error %:

Waste types considered are processed solid waste (i.e. resin, filter media) and non-compactable /

compactable dry active waste.

1. Possible Errors

a. Volume

b. Representative Sampling C. Instrument/Counting

d. Dose to Curie Calculations 27

River Bend Station .2007 Regulatory Guide 1.21 4/15/2007 Effluent and Waste Disposal Annual Report 2007 Year Solid Waste and Irradiated Fuel Shipments Reporting Period from 01/01/07 to 12/31/07 Table 3 (continued)

2. Volume Error Level indication for processed resins can be determined to +/- 0.5 inches. This correlates to approximately 1.0%. Container manufacturer stated design tolerance allows for 1.0%

deviation from container dimensions. Volume error is not applicable to dry active waste.

3. Representative Sampling Error Sampling error for processed resins is based upon obtaining a representative sample from the waste being processed using an iso-lock sampler. Sampling error from dry active waste is based upon obtaining a representative sample from the material being packaged. This error is estimated to be +/- 10% for all waste types, which is consistent with industry standards.

4. Instrument/Counting Error The error caused by sample geometry, counting time, sample activity and instrument background is estimated to be +/- 10%. The error for radiological survey instrumentation is estimated to be +/- 20%. This error is applicable to all waste types.

5. Dose to Curie Calculations Error The Dose to Curie method used to calculate activity suffers from analytical accuracy in that certain important parameters are neglected. These parameters are geometry of package, measuring instrument characteristics, build-up, internal attenuation effect, and external media attenuation. An activity correction factor is applied to provide adjustment for these factors.

This error is applicable to all waste types.

28

River Bend Station 2007 Regulatory Guide 1.21 4/15/2007 Effluent and Waste Disposal Annual Report 2007 Year Solid Waste and Irradiated Fuel Shipments Reporting Period from 01/01/07 to 12/31/07 Table 3 (continued)

2. Estimates of Major Nuclides by Waste Stream Resins, Filters and Evaporator Dry Compressible Wastes, Other Bottoms, etc. Contaminated Equipment, etc. Water, EHC, Waste Oil, etc. (Min (Min I%) (Min 1%) 1%)

Isotope Curies Isotope Curies Isotope  % Abundance Curies Abundance Abundance Mn-54 1.721 1.71E+01 Mn-54 3.370 2.66E-01 Mn-54 1.570 7.32E+00 Fe-55 78.099 7.75E+02 Fe-55 85.652 6.77E+00 Fe-55 87.655 4.09E+02 Co-60 13.016 1.29E+02 Co-60 10.086 7.98E-01 Co-60 8.921 4.16E+01 Zn-65 1.356 1.35E+01 C-14 1.950 1.94E+01 CS-137 1.227 1.22E+01 Determined by Measurement & Correlation.

Packaged in Strong, Tight Liners.

No Solidification Agent or Absorbent Used No Control Rods, Etc. were shipped in 2007

3. Solid Waste Disposition Number of Shipments Mode of Transportation Destination 41 Truck Studsvik Processing Facility - Erwin, TN.

10 Truck Energy Solutions (Bear Creek)-Oak Ridge, TN.

-5 Truck Studsvik Processing Facility - Memphis, TN.

B. Irradiated Fuel Shipments Disposition Number of Shipments Mode of Transportation Destination 0 N/A N/A 29

River Bend Station 2007 Regulatory Guide 1.21 4/15/2007 TABLE 4 Effluent and Waste Disposal Annual Report 2007 Year ASSUMPTIONS/PARAMETERS FOR DOSES TO A MEMBER OF THE PUBLIC INSIDE SITE BOUNDARY MEMBER OF LOCATION DISTANCE"' SECTOR DURATION THE PUBLIC METERS (HR/YEAR) (2)

People Entering Site Without Alligator Bayou 2500 SW 40 Consent Lawn Service General Services 115 ENE 360 Provider Building National Guard Activity Center 994 WNW 0(3)

Delivery Driver Main Warehouse 275 N 125 Workers staying Activity Center 994 WNW 1776(4) onsite Trailer City (1) The approximate distances from main plant vent exhaust to location.

(2) Liquid pathways dose is not considered due to the nature of activities that individuals are engaged in.

(3) National Guard/State Police are being evaluated, if applicable, for dose while stationed on site as members of the public. The adult age group is the only age group considered in this category. No National Guard in 2007.

(4) Workers began staying at the Activity Center Trailer City beginning April 10, 2007. Some left and some stayed for the remainder of the year. During the outage (RF-14), additional workers were on site for about 60 days. The long term indivduals will be the receptors for this pathway. For 2007, this estimate is based on 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> per day, 4 days per week for 266 days. This is based on direct observation of vehicles present and conversation with the long-term individuals. The adult age group is the only age group considered for this activity.

30

River Bend Station 2007 Regulatory Guide 1.21 4/15/2007 TABLE 5 DOSES TO MEMBERS OF THE PUBLIC ON SITE FROM GASEOUS RELEASES 2007 Critical Total Skin Dose Annual Organ Body Dose Annual Duration Dose Annual (mrem) 'Factor Annual (mrem)

(mrem)

Alligator 2.92E-04 7.95E-05 1.48E-04 4.57E-03 Bayou Lawn Service 1.37E-01 8.16E-02 1.59E-01 4.11E-02 Provider Workers staying 1.51E-01 3.06E-02 5.90E-02 2.03E-01 onsite Delivery 4.26E-02 9.89E-03 1.87E-02 1.43E-02 Driver I 31

River Bend Station 2007 Regulatory Guide 1.21 4/15/2007 Table 6 Effluent and Waste Disposal Annual Report 2007 Year Meteorological Data - Joint Frequency Tables 32

River Bend Station 2007 Regulatory Guide 1.21 4/15/2007 RIVER BEND STATION JOINT FREQUENCY TABLE ALL STABILITY CLASSES FROM 1/ 1/07 0:00 TO 3/31/07 23:00 PRIMARY SENSORS - 30 FOOT WIND SPEED (METERS/SECOND)

WIND .22- .51- .76- 1.1- 1.6- 2.1- 3.1- 5.1- 7.1- 10.1- 13.1- >18 TOT.

DIR .50 .75 1.0 1.5 2.0 3.0 5.0 7.0 10.0 13.0 18.0 N 6 10 12 36 33 58 43 0 0 0 0 0 198 NNE 12 10 9 27 38 30 1 0 0 0 0 0 127 NE 9 25 6 19 43 16 1 0 0 0 0 0 119 ENE 3 26 21 26 17 16 2 0 0 0 0 0 111 E 1 "12 14 19 14 1 0 0 0 0 0 0 61 ESE 2 13 18 54 47 33 0 0 0 0 0 0 167 SE 0 11 19 91 102 109 14 0 0 0 0 0 346 SSE 0 3 3 25 21 67 64 4 0 0 0 0 187 S 2 0 7 12 11 44 33 9 1 0 0 0 119 SSW 0 6 7 19 14 39 23 1 0 0 0 0 109 SW 1 2 9 18 7 14 6 1 0 0 0 0 58 WSW 1 1 3 13 7 26 4 0 0 0 0 0 55 W 1 4 9 8 14 18 7 0 0 0 0 0 61 WNW 0 13 10 8 7 10 10 2 0 0 0 0 60 NW 3 16 23 23 23 32 26 4 0 0 0 0 150 NNW 9 17 18 27 29 41 53 0 0 0 0 0 194 TOTAL 50 169 188 425 427 554 287 21 1 0 0 0 2122 NUMBER OF CALMS: 0 '

NUMBER OF INVALID HOURS: 38 NUMBER OF VALID HOURS: 2122 TOTAL HOURS FOR THE PERIOD: 2160 STABILITY CLASS A FROM 1/ 1/07 0:00 TO 3/31/07 23:00 PRIMARY SENSORS - 30 FOOT WIND SPEED (METERS/SECOND)

WIND .22- .51- .76- 1.1- 1.6- 2.1- 3.1- 5.1- 7.1- 10.1- 13.1- >18 TOT.

DIR .50 .75 1.0 1.5 2.0 3.0 5.0 7.0 10.0 13.0 18.0 N 0 0 0 0 0 0 0 0 0 0 0 0 0 NNE 0 0 0 0 0 3 0 0 0 0 0 0 3 NE 0 0 0 0 2 1 0 0 0 0 0 0 3 ENE 0 0 0 0 0 7 0 0 0 0 0 0 7 E 0 0 0 3 2 0 0 0 0 0 0 0 5 ESE 0 0 0 1 12 15 0 0 0 0 0 0 28 SE 0 0 0 1 15 36 5 0 0 0 0 0 57 SSE 0 0 0 0 1 16 7 0 0 0 0 0 24 S 0 0 0 0 0 1 1 0 0 0 0 0 2 SSW 0 0 0 0 0 0 0 0 0 0 0 0 0 SW 0 0 0 0 0 0 0 0 0 0 0 0 0 WSW 0 0 0 0 2 6 0 0 0 0 0 0 8 W 0 0 0 0 0 1 2 0 0 0 0 0 3 WNW 0 0 0 0 0 0 1 1 0 0 0 0 2 NW 0 0 0 0 0 0 3 0 0 0 0 0 3 NNW 0 0 0 0 0 0 2 0 0 0 0 0 2 TOTAL 0 0 0 5 34 86 21 1 0 0 0 0 147 NUMBER OF CALMS: 0 NUMBER OF INVALID HOURS: 0 NUMBER OF VALID HOURS: 147 TOTAL HOURS FOR THE PERIOD: 147

'33

River Bend Station 2007 Regulatory Guide 1.21 4/15/2007 RIVER BEND STATION JOINT FREQUENCY TABLE STABILITY CLASS B FROM 1/ 1/07 0:00 TO 3/31/07 23:00 PRIMARY SENSORS - 30 FOOT WIND SPEED (METERS/SECOND)

WIND .22- .51- .76- 1.1- 1.6- 2.1- 3.1- 5.1- 7.1- 10.1- 13.1- >18 TOT.

DIR .50 .75 1.0 1.5 2.0 3.0 5.0 7.0 10.0 13.0 18.0 N 0 0 0 0 0 0 5 0 0 0 0 0 5 NNE 0 0 0 0 1 1 0 0 0 0 0 0 2 NE 0 0 0 0 0 0 1 0 0 0 0 0 1 ENE 0 0 0 1 2 0 0 0 0 0 0 0 3 E 0 0 0 0 1 0 0 0 0 0 0 0 1 ESE 0 0 0 0 1 3 0 0 0 0 0 0 4 SE 0 0 0 0 5 8 1 0 0 0 0 0 14 SSE 0 0 0 0 0 1 4 0 0 0 0 0 5 S 0 0 0 0 0 0 5 0 0 0 0 0 5 SSW 0 0 0 0 0 0 0 0 0 0 0 0 0 SW 0 0 0 0 0 0 0 0 0 0 0 0 0 WSW 0 0 0 1 0 0 0 0 0 0 0 0 1 W 0 0 .0 0 0 1 1 0 '0 0 0 2 0

WNW 0 0 0 0 0 0 2 0 0 0 0 0 2 NW 0 0 0 0 0 3 4 1 0 0 0 0 8 NNW 0 0 0 '0 0 0 5 0 0 0 0 0 5 TOTAL 0 0 0 2 10 17 28 1 0 0 0 0 58 NUMBER OF CALMS: 0 NUMBER OF INVALID HOURS: 0 NUMBER OF VALID HOURS: 58 TOTAL HOURS FOR THE PERIOD: 58 STABILITY CLASS C FROM 1/ 1/07 0:00 TO 3/31/07 23:00 PRIMARY SENSORS - 30 FOOT WIND SPEED (METERS/SECOND)

WIND .22- .51- .76- 1.1- 1.6- 2.1- 3.1- 5.1- 7.1- 10.1- 13.1- >18 TOT.

DIR .50 .75 1.0 1.5 2.0 3.0 5.0 7.0 10.0 13.0 18.0 N 0 0 0 0 0 0 2 0 0 0 0 0 2 NNE 0 0 0 0 0 0 0 0 0 0 0 0 0 NE 0 0 0 0 2 0 '0 0 0 0 0 0 2 ENE 0 0 0 0 1 0 0 0 0 0 0 0 1 E 0 0 P0 0 0 0 0 0 0 0 0 0 0 ESE 0 0 0 1 3 0 0 0 0 0 0 0 4 SE 0 0 0 1 2 1 0 0 0 0 0 0 4 SSE 0 0 0 0 1 1 6 0 0 0 0 0 8 S 0 0 0 0 2 1 0 0 0 0 0 3 SSW 0 0 0 0 0 0 0 0 0 0 0 0 0 SW 0 0 0 0 0 0 0 0 0 0 0 0 0 WSW 0 0 0 0 0 0 1 0 0 0 0 0 1 W 0 1 0 0 0 1 0 0 0 0 0 0 2 WNW 0 0 0 0 0 0 0 1 0 0 0 0 1 NW 0 0 0 00 0 0 3 0 0 0 0 0 3 NNW 0 0 0 0 0 3 0 0 0 0 0 3 0 0 TOTAL 0 1 0 2 9 5 16 1 0 0 0 0 34 NUMBER OF CALMS: 0 NUMBER OF INVALID HOURS: 0 NUMBER OF VALID HOURS: 34 TOTAL HOURS FOR THE PERIOD: 34 34

River Bend Station 2007 Regulatory Guide 1.21 4/15/2007 RIVER BEND STATION JOINT FREQUENCY TABLE STABILITY CLASS D FROM 1/ 1/07 0:00 TO 3/31/07 23:00 PRIMARY SENSORS - 30 FOOT WIND SPEED (METERS/SECOND)

WIND .22- .51- .76- 1.1- 1.6- 2.1- 3.1- 5.1- 7.1- 10.1- 13.1- >18 TOT.

DIR .50 .75 1.0 1.5 2.0 3.0 5.0 7.0 10.0 13.0 18.0 N 0 0 5 23 26 46 35 0 0 0 0 0 135 NNE 0 0 2 11 29 24 1 0 0 0 0 0 67 NE 0 1 3 7 19 9 0 0 0 0 0 0 39 ENE 0 0 2 3 2 5 1 0 0 0 0 0 13 E 0 0 0 6 6 0 0 0 0 0 0 0 12 ESE 0 1 1 8 8 4 0 0 0 0 0 0 22 SE 0 0 0 6 20 32 7 0 0 0 0 0 65 SSE 0 0 0 1 7 31 35 3 0 0 0 0 77 S 0 0 0 2 4 21 22 8 1 0 0 0 58 SSW 0 0 2 5 2 22 14 1 0 0 0 0 46 SW 0 0 1 2 3 7 5 0 0 0 0 0 18 WSW 0 0 0 3 3 8 3 0 0 0 0 0 17 W 0 0 3 4 11 6 4 0 0 0 0 0 28 WNW 0 1 0 2 3 6 6 0 0 0 0 0 18 NW 0 0 2 10 12 18 10 2 0 0 0 0 54 NNW 0 0 3 10 14 30 38 0 0 0 0 0 95 TOTAL 0 3 24 103 169 269 181 14 1 0 0 0 764 NUMBER OF CALMS: 0 NUMBER OF INVALID HOURS: 0 NUMBER OF VALID HOURS: 764 TOTAL HOURS FOR THE PERIOD: 764 STABILITY CLASS E FROM 1/ 1/07 0:00 TO 3/31/07 23:00 PRIMARY SENSORS - 30 FOOT WIND SPEED (METERS/SECOND)

WIND .22- .51- .76- 1.1- 1.6- 2.1- 3.1- 5.1- 7.1- 10.1- 13.1- >18 TOT.

DIR .50 .75 1.0 1.5 2.0 3.0 5.0 7.0 10.0 13.0 18.0 N 0 1 1 4 7 12 1 0 0 0 0 0 26 NNE 0 2 1 5 6 2 0 0 0 0 0 0 16 NE 0 2 1 5 9 6 0 0 0 0 0 0 23 ENE 0 2 3 10 8 4 1 0 0 0 0 0 28 E 0 1 2 6 3 0 0 0 0 0 0 0 12 ESE 0 3 4 28 19 11 0 0 0 0 0 0 65 SE 0 2 5 45 45 31 1 0 0 0 0 0 129 SSE 0 1 1 9 9 18 12 1 0 0 0 0 51 S 0 0 3 3 7 18 4 1 0 0 0 0 36 SSW 0 2 0 4 6 13 8 0 0 0 0 0 33 SW 1 0 3 5 4 5 0 1 0 0 0 0 19 WSW 0 0 1 5 1 11 0 0 0 0 0 0 18 W 0 0 1 3 2 7 0 0 0 0 0 0 13 WNW 0 1 1 2 3 4 1 0 0 0 0 0 12 NW 0 0 2 6 10 11 6 1 0 0 0 0 36 NNW 1 0 2 8 15 11 5 0 0 0 0 0 42 TOTAL 2 17 31 148 154 164 39 4 0 0 0 0 559 NUMBER OF CALMS: 0 NUMBER OF INVALID HOURS: 0 NUMBER OF VALID HOURS: 559 TOTAL HOURS FOR THE PERIOD: 559 35

River Bend Station 2007 Regulatory Guide 1.21 4/15/2007 RIVER BEND STATION JOINT FREQUENCY TABLE STABILITY CLASS F FROM 1/ 1/07 0:00 TO 3/31/07 23:00 PRIMARY SENSORS - 30 FOOT WIND SPEED (METERS/SECOND)

WIND .22- .51- .76- 1.1- 1.6- 2.1- 3.1- 5.1- 7.1- 10.1- 13.1- >18 TOT.

DIR .50 .75 1.0 1.5 2.0 3.0 5.0 7.0 10.0 13.0 18.0 N 1 2 1 6 0 0 0 0 0 0 0 0 10 NNE 0 1 1 11 2 0 0 0 0 0 0 0 15 NE 0 2 1 5 10 0 0 0 0 0 0 0 18 ENE 0 3 4 8 4 0 0 0 0 0 0 0 19 E 1 6 1 0 2 1 0 0 0 0 0 0 11 ESE 1 4 8 16 4 0 0 0 0 0 0 0 33 SE 0 6 5 28 15 1 0 0 0 0 0 0 55 SSE 0 0 2 11 3 0 0 0 0 0 0 0 16 S 1 0 0 4 0 2 0 0 0 0 0 0 7 SSW 0 2 2 8 6 4 1 0 0 0 0 0 23 SW 0 1 3 9 0 2 1 0 0 0 0 16 0

WSW 0 1 2 2 1 1 0 0 0 0 0 0 7 W 0 0 1 1 1 2 0 0 0 0 0 0 5 WNW 0 1 4 2 1 0 0 0 0 0 0 0 8 NW 0 2 2 6 1 0 0 0 0 0 0 0 11 NNW 0 0 2 5 0 0 0 0 0 0 0 0 7 TOTAL 4 31 39 122 50 13 2 0 0 0 0 0 261 NUMBER OF CALMS: 0 NUMBER OF INVALID HOURS: 0 NUMBER OF VALID HOURS: 261 TOTAL HOURS FOR THE PERIOD: 261 STABILITY CLASS G FROM 1/ 1/07 0:00 TO. 3/31/07 23:00 PRIMARY SENSORS - 30 FOOT WIND SPEED (METERS/SECOND)

WIND .22- .51- .76- 1.1- 1.6- 2.1- 3.1- 5.1- 7.1- 10.1- 13.1- >18 TOT.

DIR .50 .75 1.0 1.5 2.0 3.0 5.0 7.0 10.0 13.0 18.0 N 5 7 5 3 0 0 0 0 0 0 0 0 20 NNE 12 7 5 0 0 0 0 0 0 0 0 0 24 NE 9 20 1 2 1 0 0 0 0 0 0 0 33 ENE 3 21 12 4 0 0 0 0 0 0 0 0 40 E 0 5 11 4 0 0 0 0 0 0 0 0 20 ESE 1 5 5 0 0 0 0 0 0 0 0 0 11 SE 0 3 9 10 0 0 0 0 0 0 0 0 22 SSE 0 2 0 4 0 0 0 0 0 0 0 0 6 S 1 0 4 3 0 0 0 0 0 0 0 0 8 SSW 0 2 3 2 0 0 0 0 0 0 0 0 7 SW 0 1 2 2 0 0 0 0 0 0 0 0 5 WSW 1 0 0 2 0 0 0 0 0 0 0 0 3 W 1 3 4 0 0 0 0 0 0 0 0 0 8 WNW 0 10 5 2 0 0 0 0 0 0 0 0 17 NW 3 14 17 1 0 0 0 0 0 0 0 0 35 NNW 8 17 11 4 0 0 0 0 0 0 0 0 40 TOTAL 44 117 94 43 1 0 0 0 0 0 0 0 299 NUMBER OF CALMS: 0 NUMBER OF INVALID HOURS: 0 NUMBER OF VALID HOURS: 299 TOTAL HOURS FOR THE PERIOD: 299 36

River Bend Station 2007 Regulatory Guide 1.21 4/15/2007 RIVER BEND STATION JOINT FREQUENCY TABLE ALL STABILITY CLASSES FROM 4/ 1/07 0:00 TO 6/30/07 23:00 PRIMARY SENSORS - 30 FOOT WIND SPEED (METERS/SECOND)

WIND .22- .51- .76- 1.1- 1.6- 2.1- 3.1- 5.1-*7.1- 10.1- 13.1- >18 TOT.

DIR .50 .75 1.0 1.5 2.0 3.0 5.0 7.0 10.0 13.0 18.0 N 22 31 20 30 24 34 16 0 0 0 0 0 177 NNE 22 22 11 35 24 42 4 - 0 0 0 0 0 160 NE 16 30 23 19 23 10 0 0 0 0 0 0 121 ENE 5 23 17 21 12 2 0 0 0 0 0 0 80 E 7 19 22 18 3 1 0 0 0 0 0 0 70 ESE 1 17 28 24 21 14 0 0 0 0 0 0 105 SE 2 18. 25 90 58 107 9 0 0 0 0 0 309 SSE 0 10 17 38 35 105 45 1 0 0 0 0 251 S 2 4 4 15 27 54 36 0 0 0 0 0 142 SSW 0 3 7 19 22 24 4 0 0 0 0 0 79 SW 3 6 6 9 9 5 1 0 0 0 0 0 39 WSW 3 6 9 11 10 18 0 0 0 0 0 0 57 W 2 18 10 22 15 15 2 0 0 0 0 0 84 WNW 10 32 20 18 15 7 2 0 0 0 0 0 104 NW 7 30 19 11 9 19 19 2 0 0 0 0 116 NNW 8 30 26 24 21 15 16 2 0 0 0 0 142 TOTAL 110 299 264 404 328 472 154 5 0 0 0. 0 2036 NUMBER OF CALMS: 5 NUMBER OF INVALID HOURS: 143 NUMBER OF VALID HOURS: 2041 TOTAL HOURS FOR THE PERIOD: 2184 STABILITY CLASS A FROM 4/ 1/07 0:00 TO 6/30/07 23:00 PRIMARY SENSORS - 30 FOOT WIND SPEED (METERS/SECOND)

WIND .22- .51- .76- 1.1- 1.6- 2.1- 3.1- 5.1- 7.1- 10.1- 13.1- >18 TOT.

DIR .50 .75 1.0 1.5 2.0 3.0 5.0 7.0 10.0 13.0 18.0 N 1 0 0 1 5 13' 7 0 0 0 0 0 27 NNE 1 0 0 4 12 25 2 0 0 0 0 0 44 NE 0 1 0 0 13 8 0 0 0 0 0 0 22 ENE 0 0 0 4 11 1 0 0 0 0 0 0 16 E 0 0 0 4 2 0 0 0 0 0 0 0 6 ESE 0 0 1 6 14 13 0 0 0 0 0 0 34 SE 0 0 1 5 13 60 7 0 0 0 0 0 86 SSE 0 0 1 0 11 36 11 0 0 0 0 0 59 S 0 0 0 0 2 8 8 0 0 0 0 0 18 SSW 0 0 0 1 2 4 0 0 0 0 0 0 7 SW 0 0 0 3 4 2 0 0 0 0 0 0 9 WSW 0 0 0 1 2 13 0 0 0 0 0 0 16 W 0, 0 0 5 10 8 2 0 0 0 0 0 25 WNW 0 0 1 1 7 5 2 0 0 0 0 0 16 NW 0 0 0 0 3 9 0 2 0 0 0 0 14 NNW 0 0 0 2 2 3 5 1 0 0 0 0 13 TOTAL 2 1 4 37 113 208 44 3 0 0 0 0 412 NUMBER OF CALMS: 0 NUMBER OF INVALID HOURS: 0 NUMBER OF VALID HOURS: 412 TOTAL HOURS FOR THE PERIOD: 412 37

River Bend Station 2007 Regulatory Guide 1.21 4/15/2007 RIVER BEND STATION JOINT FREQUENCY TABLE STABILITY CLASS B FROM 4/ 1/07 0:00 TO 6/30/07 23:00 PRIMARY SENSORS - 30 FOOT WIND SPEED (METERS/SECOND)

WIND .22- .51- .76- 1.1- 1.6- 2.1- 3.1- 5.1- 7.1- 10.1- 13.1- >18 TOT.

DIR .50 .75 1.0 1.5 2.0 3.0 5.0 7.0 10.0 13.0 18.0 N 0 0 0 0 0 2 3 0 0 0 0 0 5 NNE 0 0 0 0 ' 1 0 1 0 0 0 *0 0 2 NE 0 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 E 0 0 0 0 0 0 0 0 0 0 0 0 0 ESE 0 0 0 1 1 0 0 0 0 0 0 0 2 SE 0 0 0 0\ 1 5 0 0 0 0 0 0 6 SSE 0 0 0 0 1 2 2 0 0 0 0 0 5 S 0 0 0 0 0 5 6 0 0 0 0 0 11 SSW 0 0 0 1 1 0 0 0 0 0 0 0 2 SW 0 0 0 1 1 0 0 0 0 0 0 0 2 WSW 0 0 0 1 1 0 0 0 0 0 0 0 2 W 0 0 1 2 1 1 0 0 0 0 0 0 5 WNW 0 0 0 1 0 0 0 0 0 0 0 0 1 NW 0 0 0 1 3 2 4 0 0 0 0 0 10 NNW 0 0 0 0 1 2 3 1 0 0 0 0 7 TOTAL 0 0 1 8 12 19 19 1 0 0 0 0 60 NUMBER OF CALMS: 0 NUMBER OF INVALID HOURS: 0 NUMBER OF VALID HOURS: 60 TOTAL HOURS FOR THE PERIOD: 60 STABILITY CLASS C FROM 4/ 1/07 0:00 TO 6/30/07 23:00 PRIMARY SENSORS - 30 FOOT WIND SPEED (METERS/SECOND)

WIND .22- .51- .76- 1.1- 1.6- 2.1- 3.1- 5.1- 7.1- 10.1- 13.1- >18 TOT.

DIR .50 .75 1.0 1.5 2.0 3.0 5.0 7.0 10.0 13.0 18.0 N 0 0 0 0 1 2 0 0 0 0 0 0 3 NNE 0 0 0 0 0 0 0 0 0 0 0 0 0 NE 0 0 0 1 0 0 0 0 0 0 0 0 1 ENE 0 0 0 1 0 0 0 0 0 0 0 0 1 E 0 0 0 2 0 0 0 0 0 0 0 0 2 ESE 0 0 0 1 1 0 0 0 0 0 0 0- 2 SE 0 0 0 1 2 1 0 0 0 0 0 0 4 SSE 0 0 0 0 0 1 0 0 0 0 0 0 1 S 0 0 0 0 2 1 1 0 0 0 0 0 4 SSW 0 0 0 0 3 0 0 0 0 0 0 0 3 SW 0 0 0 0 1 0 0 0 0 0 0 0 1 WSW 0 0 0 0 1 0 0 0 0 0 0 0 1 W 0 0 0 1 0 0 0 0 0 0 0 0 1 WNW 0 0 0 0 1 1 0 0 0 0 0 0 2 NW 0 0 0 1 0 0 2 0 0 0 0 0 3 NNW 0 0 0 2 0 1 3 0 0 0 0 0 6 TOTAL 0 '0 0 10 12 7 6 0 0 0 0 0 35 NUMBER OF CALMS: 0 NUMBER OF INVALID HOURS, NUMBER OF VALID HOURS: 35 TOTAL HOURS FOR THE PERIOD: 36 38

River Bend Station 2007 Regulatory Guide 1.21 4/15/2007 RIVER BEND STATION JOINT FREQUENCY TABLE STABILITY CLASS D FROM 4/ 1/07 0:00 TO 6/30/07 23:00 PRIMARY SENSORS - 30 FOOT WIND SPEED (METERS/SECOND)

WIND .22- .51- .76- 1.1- 1.6- 2.1- 3.1- 5.1- 7.1- 10.1- 13.1- >18 TOT.

DIR .50 .75 1.0 1.5 2.0 3.0 5.0 7.0 10.0 13.0 18.0 N 0 0 1 2 3 13 5 0 0 0 0 0 24 NNE 0 0 1 7 3 5 0 0 0 0 0 0 16 NE 0 1 1 4 4 0 0 0 0 0 0 0 10 ENE 0 0 0 5 1 0 0 0 0 0 0 0 6 E 0 0 1 3 1 0 0 0 0 0 0 0 5 ESE 0 0 3 7 4 1 0 0 0 0 0 0 15 SE 0 1 2 10 17 17 2 0 0 0 0 0 49 SSE 0 0 0 5 6 34 24 1 0 0 0 0 70 S 0 0 1 4 6 14 12 0 0 0 0 0 37 SSW 0 0 0 2 11 4 4 0 0 0 0 0 21 SW 1 0 1 1 2 2 1 0 0 0 0 0 8 WSW 1 0 0 2 2 4 0 0 0 0 0 0 9 W 1 1 1 6 3 4 0 0 0 0 0 0 16 WNW 0 0 1 6 5 1 0 0 0 0 0 0 13 NW 0 0 0 1 2 6 13 0 0 0 0 0 22 NNW 0 0 0 2 5 5 5 0 0 0 0 0 17 TOTAL 3 3 13 67 75 110 66 1 0 0 0 0 338 NUMBER OF CALMS: 0 NUMBER OF INVALID HOURS: 4 NUMBER OF VALID HOURS: 338 TOTAL HOURS FOR THE PERIOD: 342 STABILITY CLASS E FROM 4/ 1/07 0:00 TO 6/30/07 23:00 PRIMARY SENSORS - 30 FOOT WIND SPEED (METERS/SECOND)

WIND .22- .51- .76- 1.1- 1.6- 2.1- 3.1- 5.1- 7.1- 10.1- 13.1- >18 TOT.

DIR .50 .75 1.0 1.5 2.0 3.0 5.0 7.0 10.0 13.0 18.0 N 0 6 5 6 8 4 1 0 0 0 0 0 30 NNE 2 5 5 7 6 12 1 0 0 0 0 0 38 NE 2 5 9 8 3 1 0 0 0 0 0 0 28 ENE 2 4 8 6 0 1 0 0 0 0 0 0 21 E 1 9 14 7 0 1 0 0 0 0 0 0 32 ESE 0 5 14 8 1 0 0 0 0 0 0 0 28 SE 0 4 10 54 20 21 0 0 0 0 0 0 109 SSE 0 3 1 15 11 24 7 0 0 0 0 0 61 S 0 2 2 10 15 17 5 0 0 0 0 0 51 SSW 0 1 6 12 3 12 0 0 0 0 0 0 34 SW 0 3 3 3 0 1 0 0 0 0 0 0 10 WSW 0 2 8 5 4 1 0 0 0 0 0 0 20 W 0 3 2 6 1 2 0 0 0 0 0 0 14 WNW 2 4 9 7 2 0 0 0 0 0 0 0 24 NW 0 4 4 6 1 2 0 0 0 0 0 0 17 NNW 0 0 8 10 10 4 0 0 0 0 0 0 32 TOTAL 9 60 108 170 85 103 14 0 0 0 0 0 549 NUMBER OF CALMS: 0 NUMBER OF INVALID HOURS: 14 NUMBER OF VALID HOURS: 549 TOTAL HOURS FOR THE PERIOD: 563 39

River Bend Station 2007 Regulatory Guide 1:21 4/15/2007 RIVER BEND STATION JOINT FREQUENCY TABLE STABILITY CLASS F FROM 4/ 1/07 0:00 TO 6/30/07 23:00 PRIMARY SENSORS - 30 FOOT WIND SPEED (METERS/SECOND)

WIND .22- .51- .76- 1.1- 1.6- 2.1- 3.1- 5.1- 7.1- 10.1- 13.1- >18 TOT.

DIR .50 .75 1.0 1.5 2.0 3.0 5.0 7.0 10.0 13.0 18.0 N 2 6 11 8 6 0 0 0 0 0 0 0 33 NNE 2 6 1 12 2 0 0 0 0 0 0 0 23 NE 2 13 7 3 3 1 0 0 0 0 0 0 29 ENE 1 11 7 3 0 0 0 0 0 0 0 0 22 E 3 5 5 1 0 0 0 0 0 0 0 0 14 ESE 1 7 7 1 0 0 0 0 0 0 0 0 16 SE 2 7 9 18. 4 3 0 0 0 0 0 0 43 SSE 0 3 11 13 4 7 1 0 0 0 0 0 39 S 1 1 1 1 2 6 3 0 0 0 0 0 15 SSW 0 1 1 2 0 1 0 0 0 0 0 0 5 SW 1 1 2 1 1 0 0 0 0 0 0 0 6 WSW 0 3 0 2 0 0 0 0 0 0 0 0 5 W 0 6 5 2 0 0 0 0 0 0 0 0 13 WNW 4 11 7 3 0 0 0 0 0 0 0 0 25 NW 2 8 8 1 0 0 0 0 0 0 0 0 19 NNW 3 7 3 4 2 0 0 0 0 0 0 0 19 TOTAL 24 96 85 75 24 18 4 0 0 0 0 0 326 NUMBER OF CALMS: 4 NUMBER OF INVALID HOURS: 0 NUMBER OF VALID HOURS: 330 TOTAL HOURS FOR THE PERIOD: 330 STABILITY CLASS G FROM 4/ 1/07 0:00 TO 6/30/07 23:00 PRIMARY SENSORS - 30 FOOT WIND SPEED (METERS/SECOND)

WIND .22- .51- .76- 1.1- 1.6- 2.1- 3.1- 5.1- 7.1- 10.1- 13.1- >18 TOT.

DIR .50 .75 1.0 1.5 2.0 3.0 5.0 7.0 10.0 13.0 18.0 N 19 19 3 13 1 0 0 0 0 0 0 0 55 NNE 17 11 4 5 0 0 0 0 0 0 0 0 37 NE 12 10 6 3 0 0 0 0 0 0 0 0 31 ENE 2 8 2 2 0 0 0 0 0 0 0 0 14 E 3 5 2 1 0 0 0 0 0 0 0 0 11 ESE 0 5 3 0 0 0 0 0 0 0 0 0 8 SE 0 6 3 2 1 0 0 0 0 0 0 0 12 SSE 0 4 4 5 2 1 0 0 0 0 0 0 16 S 1 1 0 0 0 3 1 0 0 0 0 0 6 SSW 0 1 0 1 2 3 0 0 0 0 0 0 7 SW 1 2 0 0 0 0 0 0 0 0 0 0 3 WSW 2 1, 1 0 0 0 0 0 0 0 0 0 4 W 1 8 1 0 0 0 0 0 0 0 0 0 10 WNW 4 17 2 0 0 0 0 0 0 0 0 0 23 NW 5 18 7 1 0 0 0 0 0 0 0 0 31 NNW 5 23 15 4 1 0 0 0 0 0 0 0 48 TOTAL 72 139 53 37 7 7 1 0 0 0 0 0 316 NUMBER OF CALMS: 1 NUMBER OF INVALID HOURS: 0 NUMBER OF VALID HOURS: 317 TOTAL HOURS FOR THE PERIOD: 317 40

River Bend Station 2007 Regulatory Guide 1.21 4/15/2007 RIVER BEND STATION JOINT FREQUENCY TABLE ALL STABILITY CLASSES FROM 7/ 1/07 0:00 TO 9/30/07 23:00 PRIMARY SENSORS - 30 FOOT WIND SPEED (METERS/SECOND)

WIND .22- .51- .76- 1.1- 1.6- 2.1- 3.1- 5.1- 7.1-10.1- 13.1- >18 TOT.

DIR .50 .75 1.0 1.5 2.0 3.0 5.0 7.0 10.0 13.0 18.0 N 18 18 30 53 18 22 1 0 0 0 0 0 160 NNE 18 20 28 38 13 19 0 0 0 0 0 0 136 NE 10 23 22 38 21 4 0 0 0 0 0 0 118 ENE 11 21 17 41 18 1 0 0 0 0 0 0 109 E 7 20 20 27 13 0 0 0 0 0 0 0 87 ESE 8 17 17 25 14 1 0 0 0 0 0 0 82 SE 7 29 39 67 75 49 5 0 0 0 0 0 271 SSE 5 11 17 46 40 38 12 0 0 0 0 0 169 S 2 6 6 12 21 40 10 0 0 0 0 0 97 SSW 3 7 12 21 18 33 4 0 0 0 0 0 98 SW 4 11 11 15 21 17 0 0 0 0 0 0 79 WSW 6 11 16 16 27 20 0 0 0 0 0 0 96 W 12 27 12 24 22 38 1 0 0 0 0 0 136 WNW 15 28 16 22 24 21 3 0 0 0 0 0 129 NW 23 47 12 15 14 9 0 0 0 0 0 0 120 NNW 27 36 20 24 18 24 2 0 0 0 0 0 151 TOTAL 176 332 295 484 377 336 38 0 0 0 0 0 2038 NUMBER OF CALMS: 5 NUMBER OF INVALID HOURS: 165 NUMBER OF VALID'HOURS: 2043 TOTAL HOURS FOR THE PERIOD: 2208 STABILITY CLASS A FROM 7/ 1/07 0:00 TO 9/30/07 23:00 PRIMARY SENSORS - 30 FOOT WIND SPEED (METERS/SECOND)

WIND .22- .51- .76- 1.1- 1.6- 2.1- 3.1- 5.1- 7.1- 10.1- 13.1- >18 TOT.

DIR .50 .75 1.0 1.5 2.0 3.0 5.0 7.0 10.0 13.0 18.0 N 0 0 0 0 0 0 0 0 0 0 0 0 0 NNE 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 ENE 0 0 0 0 0 1 0 0 0 0 0 0 1 E 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 SE 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 S 0 0 0 0 0 0 0 0 0 0 0 0 0 SSW 0 0 0 0 0 0 0 0 0 0 0 0 0 SW 0 0 0 0 0 0 0 0 0 0 0 0 0 WSW 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 WNW 0 0 0 0 0 0 0 0 0 0 0 0 0 NW 0 0 0 0 0 0O 0 0 0 0 0 0 0 NNW 0 0 0 0 0 0 0 0 0 0 0 0 0 TOTAL 0 0 0 0 0 1 0 0 0 0 0 0 1 NUMBER OF CALMS: 0 NUMBER OF INVALID HOURS: 0 NUMBER OF VALID HOURS: 1 TOTAL HOURS FOR THE PERIOD: 1 41

River Bend Station 2007 Regulatory Guide 1.21 4/15/2007 RIVER BEND STATION JOINT FREQUENCY TABLE STABILITY CLASS B FROM 7/ 1/07 0:00 TO 9/30/07 23:00 PRIMARY SENSORS - 30 FOOT WIND SPEED (METERS/SECOND)

WIND .22- .51- .76- 1.1- 1.6- 2.1- 3.1- 5.1- 7.1- 10.1- 13.1- >18 TOT.

DIR .50 .75 1.0 1.5 2.0 3.0 5.0 7.0 10.0 13.0 18.0 N... . 0..

.. 0.... 0..

.. 0... 0.... 0..... 0..

. .. 0.. ... 0.....

.. 0 0......... 0..

N 0 0 0 0 0 0 0 0 0 0 0 0 0 NNE 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 ENE 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 ESE 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 SSE 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 0 0 SSW 0 0 0 0 0 0 0 0 0 0 0 0 0 SW 0 0 0 0 0 0 0 0 0 0 0 0 0 WSW 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 WNW 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 NNW 0 0 0 0 0 0 0 0 0 0 0 0 0 TOTAL. 0 0 0 0 0 0 0 0 0 0 .0 0 0 NUMBER OF CALMS: 0 NUMBER OF INVALID HOURS: 0 NUMBER OF VALID HOURS:. 0 TOTAL HOURS FOR THE PERIOD: 0 STABILITY CLASS C FROM 7/ 1/07 0:00 TO 9/30/07 23:00 PRIMARY SENSORS - 30 FOOT WIND SPEED (METERS/SECOND)

WIND .22- .51- .76- 1.1- 1.6- 2.1- 3.1- 5.1- 7.1- 10.1- 13.1- >18 TOT.

DIR .50 .75 1.0 1.5 2.0, 3.0 5.0 7.0 10.0 13.0 18.0 N 0 0 0 0 0 0 0 0 0 0 0 0 0 NNE 0 0 0 0 0 0 0 0 0 0 0 0 0 NE 0 0 0 0 0 1 0 0 0 0 0 0 1 ENE 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 ESE 0 0 0 1 0 0 0 0 0 0 0 0 1 SE 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 S 0 0 0 0 0 0 0 0 0 0 0 0 0 SSW 0 0 0 0 0 0 0 0 0 0 0 0 0 SW 0 0 0 0 0 0 0 0 0 0 0 0 0 wSW 0 0 0 0 0 0 0 0 0 0 0 0 0 W 0 0 0 0o 0 0 0 0 0 0 0 0 0 WNW 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 NNW 0 0 0 0 0 0 0 0 0 0 0 0 0 TOTAL 0 0 0 1 0 1 0 0 0 0 0 0 2 NUMBER OF CALMS: 0 NUMBER OF INVALID HOURS: 0 NUMBER OF VALID HOURS: 2 TOTAL HOURS FOR THE PERIOD: 2 42

River Bend Station 2007 Regulatory Guide 1.21 4/15/2007 RIVER BEND STATION JOINT FREQUENCY TABLE STABILITY CLASS D FROM 7/ 1/07 0:00 TO 9/30/07 23:00 PRIMARY SENSORS - 30 FOOT WIND SPEED (METERS/SECOND)

WIND .22- .51- .76- 1.1- 1.6- 2.1- 3.1- 5.1- 7.1- 10.1- 13.1- >18 TOT.

DIR .50 .75 1.0 1.5 2.0 3.0 5.0 7.0 10.0 13.0 18.0 N 0 0 3 5 1 0 0 0 0 0 0 0 9 NNE 0 2 1 5 1 3 0 0 0 0 0 0 12 NE 0 3 3 7 6 2 0 0 0 0 0 0 21 ENE 0 1 5 10 4 0 0 0 0 0 0 0 20 E 0 1 5 12 3 0 0 0 0 0 0 0 21 ESE 0 1 6 6 2 0 0 0 0 0 0 0 15 SE 0 2 6 17 19 13 4 0 0 0 0 0 61 SSE 0 0 1 9 8 2 4 0 0 0 0 0 24 S 0 0 1 1 4 4 0 0 0 0 0 0 10 SSW 0 0 1 1 3 4 1 0 0 0 0 0 10 SW 0 0 2 2 2 1 0 0 0 0 0 0 7 WSW 0 0 1 1 2 1 0 0 0 0 0 0 5 W 0 1 1 3 2 2 0 0 0 0 0 0 9 WNW 0 2 1 6 5 2 3 0 0 0 0 0 19 NW 0 0 1 4 3 :i 0 0 0 0 0 0 9 NNW 0 1 1 4 1 1 1 0 0 0 0 0 9 TOTAL 0 14 39 93 66 36 13 0 0 0 0 0 261 NUMBER OF CALMS: 0 NUMBER OF INVALID HOURS: 0 NUMBER OF VALID HOURS: 261 TOTAL HOURS FOR THE PERIOD: 261 STABILITY CLASS E FROM 7/ 1/07 0:00 TO 9/30'/07 23:00 PRIMARY SENSORS - 30 FOOT WIND SPEED (METERS/SECOND)

WIND .22- .51- .76- 1.1- 1.6- 2.1- 3.1- 5.1- 7.1- 10.1- 13.1- >18 TOT.

DIR .50 .75 1.0 1.5 2.0' 3.0 5.0 7.0 10.0 13.0 18.0 N 2 6 12 14 5 20 1 0 0 0 0 0 60 NNE 2 10 7 15 10 16 0 0 0 0 0 0 60 NE 2 6 16 20 14 1 0 0 0 0 0 0 59 ENE 4 10 8 26 10 0 0 0 0 0 0 0 58 E 3 12 10 11 8 0 0 0 0 0 0 0 44 ESE 5 11 11 14 8 1 0 0 0 0 0 0 50 SE 3 .9 22 42 42 29 1 0 0 0 0 0 148 SSE 2 8 11 23 16 19

• 7 0 0 0 0 0 86 S 1 3 2 7 5 7 6 0 0 0 0 0 31 SSW 1 4 8 14 2 4 0 0 0 0 0 0 33 SW 1 8 5 8 2 3 0 0 0 0 0 27 WSW 2 5 8 6 7 11 0 0 0 0 0 0. 39 W 4 11 6 10 11 16 1 0 0 0 0 0 59 WNW 9 6 10 12 9 15 0 0 0 0 0 .0 .61 NW 2 7 5 2 5 7 0 0 0 0 0 0 28 NNW 4 5 7 7 7 18 1 0 0 0 0 0 49 TOTAL 47 121 148 231 161 167 17 0 0 0 0 0 892 NUMBER OF CALMS: 1 NUMBER OF INVALID HOURS: 0 NUMBER OF VALID HOURS: 893 TOTAL HOURS FOR THE PERIOD: 893 43

River Pend Station 2007 Regulatory Guide 1.21 4/15/2007 RIVER BEND STATION JOINT FREQUENCY TABLE STABILITY CLASS F FROM 7/ 1/07 0:00 TO 9/30/07 23:00 PRIMARY SENSORS - 30 FOOT WIND SPEED (METERS/SECOND)

WIND .22- .51- .76- 1.1- 1.6- 2.1- 3.1- 5.1- 7.1- 10.1- 13.1- >18 TOT.

DIR .50 .75 1.0 1.5 2.0 3.0 5.0 7.0 10.0 13.0 18.0 N 5 5 9 19 7 2 0 0 0 0 0 0 47 NNE 8 7 17 15 2 0 0 0 0 0 0 0 49 NE 3 10 2 10 1 0 0 0 0 0 0 0 26 ENE 7 7 4 5 4 0 0 0 0 0 0 0 27 E 2 6 4 2 2 0 0 0 0 0 0 0 16 ESE 3 4 0 4 4 0 0 0 0 0 0 0 15 SE 2 18 10 8 13 7 0 0 0 0 0 0 58 SSE 1 3 5 14 10 17 1 0 0 0 0 0 51 S 1 3 2 1 3 24 4 0 0 0 0 0 38 SSW 2 3 3 3 5 18 3 0 0 0 0 0 37 SW 3 2 4 2 14 9 0 0 0 0 0 0 34 WSW 3 c5 5 5 14 8 0 0 0 0 0 0 40 W 5 9 4 9 7 20 0 0 0 0 0 0 54 WNW 4 11 5 2 8 4 0 0 0 0 0 0 34 NW 12 18 3 6 3 1 0 0 0 0 0 0 43 NNW 13 16 3 9 7 5 0 0 0 0 0 0 53 TOTAL 74 127 80 114 104 115 8 0 0 0 0 0 622 NUMBER OF CALMS: 1 NUMBER OF INVALID HOURS: 0.

NUMBER OF VALID HOURS: 623 TOTAL HOURS FOR THE PERIOD: 623 STABILITY CLASS G FROM 7/ 1/07 0:00 TO 9/30/07 23:00 PRIMARY SENSORS - 30 FOOT WIND SPEED (METERS/SECOND)

WIND .22- .51- .76- 1.1- 1.6- 2.1- 3.1- 5.1- 7.1- 10.1- 13.1- >18 TOT.

DIR .50 .75 1.0 1.5 2.0 3.0 5.0 7.0 10.0 13.0 18.0 N 11 7 6 15 5 0 0 0 0 0 0 0 44 NNE 8 1 3 3 0 0 0 0 0 0 0 0 15 NE 5 4 1 1 0 0 0 0 0 0 0 0 11 ENE 0 3 0 0 0 0 0 0 0 0 0 0 3 E 2 1 1 2 0 0 0 0 0 0 0 0 6 ESE 0 1 0 0 0 0 0 0 0 o 0 0 1 SE 2 0 1 0 1 0 0 0 0 o 0 0 4 SSE 2 0 0 0 6 0 0 0 0 o 0 0 8 S 0 0 1 3 9 5 0 0 0 o 0 0 18 SSW 0 0 0 3 8 7 0 0 0 o 0 0 18 SW 0 1 0 3 3 4 0 0 0 0 0 0 11 WSW 1 1 2 4 4 0 0 0 0 0 0 0 12 W 3 6 1 2 2 0 0 0 0 0 0 0 14 WNW 2 9 0 2 2 0 0 0 0 0 0 0 15 NW 9 22 3 3 3 0 0 0 0 0 0 0 40 NNW 10 14 9 4 3 0 0 0 0 0 0 0 40 TOTAL 55 70 28 45 46 16 0 0 0 0 0 0 260 NUMBER OF CALMS: 3 NUMBER OF INVALID HOURS: 0 NUMBER OP VALID HOURS: 263 TOTAL HOURS FOR THE PERIOD: 263 44

River Bend Station 2007 Regulatory Guide 1.21 4/15/2007 RIVER BEND STATION JOINT FREQUENCY TABLE ALL STABILITY CLASSES FROM 10/ 1/07 0:00 TO 12/31/07 23:00 PRIMARY SENSORS - 30 FOOT WIND SPEED (METERS/SECOND)

WIND .22- .51- .76- 1.1- 1.6- 2.1- 3.1- 5.1- 7 1- 10.1- 13.1- >18 TOT.

DIR .50 .75 1.0 1.5 2.0 3.0 5.0 7.0 10.0 13.0 18.0 N 9 27 25 64 47 44 47 0 0 0 0 0 263 NNE 26 25 19 69 67 27 7 0 0 0 0 0 240 NE 20 32 14 64 38 24 1 0 0 0 0 0 193 ENE 8 34 25 24 26 9 0 0 0 0 0 0 126 E 2 19 21 21 14 3 0 0 0 0 0 0 80 ESE 3 20 27 44 28 18 0 0 0 0 0 0 140 SE 4 5 22 106 127 86 5 0 0 0 0 0 355 SSE 1 7 11 35 32 64 22 1 0 0 0 0 173 S 1 10 10 21 22 37 8 0 0 0 0 0 109 SSW 0 4 6 14 17 10 5 0 0 0 0 0 56 SW 0 2 1 11 8 16 3 0 0 0 0 0 41 WSW 1 2 6 3 5 5 2 0 0 0 0 0 24 W 1 5 0 11 14 11 0 0 0 0 0 0 42 WNW 2 5 5 15 5 21 13 0 0 0 0 0 66 NW 3 14 9 9 8 25 33 1 0 0 0 0 102 NNW 6 23 21 17 20 41 23 0 0 0 0 0 151 TOTAL 87 234 222 528 478 441 169 2 0 0 0 0 2161 NUMBER OF CALMS: 1 NUMBER OF INVALID HOURS: 46 NUMBER OF VALID HOURS: 2162 TOTAL HOURS FOR THE PERIOD: 2208 STABILITY CLASS A FROM 10/ 1/07 0:00 TO 12/31/07 23:00 PRIMARY SENSORS - 30 FOOT WIND SPEED (METERS/SECOND)

WIND .22- .51- .76- 1.1- 1.6- 2.1- 3.1- 5.1- 7.1- 10.1- 13.1- >18 TOT.

DIR .50 .75 1.0 1.5 2.0 3.0 5.0 7.0 10.0 13.0 18.0 N 0 0 0 0 0 3 5 0 0 0 0 0 8 NNE 0 0 0 0 3 7 5 0 0 0 0 0 15 NE 0 0 1 0 5 6 1 0 0 0 0 0 13 ENE 0 0 1 0 5 4 0 0 0 0 0 0 10 E 0 0 0 0 3 3 0 0 0 0 0 0 6 ESE 0 0 0 0 9 5 0 0 0 0 0 0 14 SE 0 0 0 0 10 19 0 0 0 0 0 0 29 SSE 0 0 0 0 0 10 1 0 0 0 0 0 11 S 0 0 0 0 0 0 0 0 0 0 0 0 0 SSW 0 0 0 0 0 1 0 0 0 0 0 0 1 SW 0 0 0 0 0 0 0 0 0 0 0 0 0 WSW 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 WNW 0 0 0 0 0 0 0 0 0 0 0 0 0 NW 0 0 0 0 0 0 1 0 0 0 0 0 1 NNW 0 0 0 0 0 0 1 0 0 0 0 0 1 TOTAL 0 0 2 0 35 58 14 0 0 0 0 0 109 NUMBER OF CALMS: 0 NUMBER OF INVALID HOURS: 1 NUMBER OF VALID HOURS: 109 TOTAL HOURS FOR THE PERIOD: 110 45

River Bend Station 2007 Regulatory Guide 1.21 4/15/2007 RIVER BEND STATION JOINT FREQUENCY TABLE STABILITY CLASS B FROM 10/ 1/07 0:00 TO 12/31/07 23:00 PRIMARY SENSORS- 30 FOOT WIND SPEED (METERS/SECOND)

WIND .22- .51- .76- 1.1- 1.6- 2.1- 3.1- 5.1- 7.1- 10.1- 13.1- >18 TOT.

DIR 50 .75 1.0 1.5 2.0 3.0 5.0 7.0 10.0 13.0 18.0 N 0 0 0 0 0 14 16 0 0 0 0 0 30 NNE 0 0 0 0 5 5 0 0 0 0 0 0 10 NE 0 0 0 1 7 0 0 0 0 0 0 0 8 ENE 0 0 1 0 ý2 0 0 0 0 0 0 0 3 E 0 0 0 2 3 0 0 0 0 .0 0 0 5 ESE 0 0 0 5 4 2 0 0 0. 0 0 0 11 SE 0 0 0 2 9 9 1 .0 0 0 0 0 21 SSE 0 0 0 0 3 9 6 0 0 0 0 0 18 S 0 0 0 0 0 10 3 0 0 0 0 0 13 SSW 0 0 0 0 0 2 0 0 o 0 0 0 2 SW 0 0 0 0 0 0 1 0 .0 0 0 0 1 WSW 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 WNW 0 0 0 0 0 0 0 0 0 0 0 0 0 NW 0 0 0 0 0 1 2 0 0 0 0 0 3 NNW 0 0 0 0 0 2 2 0 0 0 0 0 4 TOTAL 0 0 1 10 33 54 31 0 0 0 0 0 129 NUMBER OF CALMS: 0 NUMBER OF INVALID HOURS: 0 NUMBER OF VALID HOURS: 129 TOTAL HOURS FOR THE PERIOD: 129 STABILITY CLASS C FROM 10/ 1/07 0:00 TO 12/31/07 23:00 PRIMARY SENSORS - 30 FOOT WIND SPEED (METERS/SECOND)

WIND .22- .51- .76- 1.1- 1.6- 2.1- 3.1- 5.1- 7.1- 10.1- 13.1- >18 TOT.

DIR .50 .75 1.0 1.5 2.0 3.0 5.0 7.0 10.0 13.0 18.0 N 0 0 0 0 1 4 6 0 0 0 0 0 11 NNE 0 0 0 2 4 3 2 0 0 0 0 0 11 NE 0 0 0 0 3 0 0 0 0 0 0 0 3 ENE 0 0 0 2 3 0 0 0 0 0 0 0 5 E 0 0 0 2 1 0 0 0 0 0 0 0 3 ESE 0 0 0 2 0 0 0 0 0 0 0 0 2 SE 0 0 0 1 1 3 1 0 0 0 0 0 6 SSE 0 0 0 0 1 0 1 0 0 0 0 0 2 S 0 0 0 0 1 4 1 0 0 0 0 0 6 SSW 0 0 0 1 3 2 0 0 0 0 0 6 SW 0 0 0 0 1 5 1 0 0 0 0 0 7 WSW 0 0 0 0 0 1 0 0 0 0 0 0 1 W 0 0 0 0 1 1 0 0 0 0 0 0 2 WNW 0 0 1 0 0 0 0 0 0 0 0 0 1 NW 0 0 0 0 1 1 3 0 0 0 0 0 5 NNW 0 0 0 0 0 2 2 0 0 0 0 0 4 TOTAL 0 0 1 9 19 27 19 0 0 0 0 0 75 NUMBER OF CALMS: 0 NUMBER OF INVALID HOURS: 0 NUMBER OF VALID HOURS: 75 TOTAL HOURS FOR THE PERIOD: 75 46

River Bend Station 2007 Regulatory Guide 1.21 4/15/2007 RIVER BEND STATION JOINT FREQUENCY TABLE STABILITY CLASS D FROM 10/ 1/07 0:00 TO 12/31/07 23:00 PRIMARY SENSORS - 30 FOOT WIND SPEED (METERS/SECOND)

WIND .22- .51- .76- 1.1- 1.6- 2.1- 3.1- 5.1- 7.1- 10.1- 13.1- >18 TOT.

DIR .50 .75 1.0 1.5 2.0 3.0 5.0 7.0 10.0 13.0 18.0 N 0 1 0 8 16 19 17 0 0 0 0 0 61 NNE 0 0 0 9 23 4 0 0 0 0 0 0 36 NE 0 0 2 18 9 10 0 0 0 0 0 0 39 ENE 0 0 2 5 7 2 0 0 0 0 0 0 16 E 0 0 1 11 2 0 0 0 0 0 0 0 14 ESE 0 1 4 16 4 4 0 0 0 0 0 0 29 SE 0 0 1 20 33 23 3 0 0 0 0 0 80 SSE 0 0 0 0 8 28 12 1 0 0 0 0 49 S 0 0 1 5 8 17 3 0 0 0 0 0 34 SSW 0 0 0 2 7 3 3 0 0 0 0 0 15 SW 0 0 0 7 5 8 1 0 0 0 0 -0 21 WSW 0 0 1 2 5 4 2 0 0 0 0 0 14 W 0 0 0 5 13 10 0 0 0 0 0 0 28 WNW 0 0 1 1 5 21 10 0 0 0 0 0 38 NW 0 0 0 5 6 18 23 1 0 0 0 0 53 NNW 0 0 0 2 11 33 16 0 0 0 0 0 62 TOTAL 0 2 13 116 162 204 90 2 0 0 0 0 589 NUMBER OF CALMS: 0 NUMBER OF INVALID HOURS: 0 NUMBER OF VALID HOURS: 589 TOTAL HOURS FOR THE PERIOD: 589 STABILITY CLASS E FROM 10/ 1/07 0:00 TO 12/31/07 23:00 PRIMARY SENSORS - 30 FOOT WIND SPEED (METERS/SECOND)

WIND .22- .51- .76- 1.1- 1.6- 2.1- 3.1- 5.1- 7.1- 10.1- 13.1- >18 TOT.

DIR .50 .75 1.0 1.5 2.0 3.0 5.0 7.0 10.0 13.0 18.0 N 3 4 7 38 28 4 3 0 0 0 0 0 87 NNE 0 1 9 22 31 7 0 0 0 0 0 0 70 NE 0 3 4 31 13 8 0 0 0 0 0 0 59 ENE 0 3 7 10 6 3 0 0 0 0 0 0 29 E 0 6 9, 5 5 0 0 0 0 0 0 0 25 ESE 0 9 12 19 11 7 0 0 0 0 0 0 58 SE 0 4 9 72 72 32 0 0 0 0 0 0 189 SSE 0 2 3 32 19 17 2 0 0 0 0 0 75 S 0 1 8 13 11 6 1 0 0 0 0 0 40 SSW 0 1 3 12 9 1 0 0 0 0 0 0 26 Sw 0 0 0 3 2 3 0 0 0 0 0 0 8 WSW 0 0 5 1 0 0 0 0 0 0 0 0 6 W 0 3 0 6 0 0 0 0 0 0 0 0 9 WNW 0 2 2 14 0 0 3 0 0 0 0 0 21 NW 0 1 1 4 1 5 4 0 0 0 0 0 16 NNW 0 1 2 9 7 4 2 0 0 0 0 0 25 TOTAL 3 41 81 291 215 97 15 0 0 0 0 0 743 NUMBER OF CALMS: 0 NUMBER OF INVALID HOURS: 2 NUMBER OF VALID HOURS: 743 TOTAL HOURS FOR THE PERIOD: 745 47

River Bend Station 2007 Regulatory Guide 1.21 4/15/2007 RIVER BEND STATION JOINT FREQUENCY TABLE STABILITY CLASS F FROM 10/ 1/07 0:00 TO 12/31/07 23:00 PRIMARY SENSORS - 30 FOOT WIND SPEED (METERS/SECOND)

WIND .22- .51- .76- 1.1- 1.6- 2.1- 3.1- 5.1- 7.1- 10.1- 13.1- >18 TOT.

DIR .50 .75 1.0 1.5 2.0 3.0 5.0 7.0 10.0 13.0 18.0 N 1 1 10 10 1 0 0 0 0 0 0 0 23 NNE 1 5 5 29 1 0 0 0 0 0 0 0 41 NE 2 6 6 14 1 0 0 0 0 0 0 0 29 ENE 3 9 5 7 3 0 0 0 0 0 0 0 27 E 0 9 8 1 0 0 0 0 0 0 0 0 18 ESE 2 6 8 2 0 0 0 0 0 0 0 0 18 SE 2 1 12 10 2 0 0 0 0 0 0 0 27 SSE 0 4 4 3 0 0 0 0 0 0 0 0 11 S 1 3 0 2 2 0 0 0 0 0 0 0 8 SSW 0 1 2 0 0 0 0 0 0 0 0 0 3 SW 0 0 1 1 0 0 0 0 0 0 0 0 2 WSW 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 WNW 1 1 1 0 0 0 0 0 0 0 0 0 3 NW 1 4 2 0 0 0 0 0 0 0 0 0 7 NNW 1 4 3 3 2 0 0 0 0 0 0 0 13 TOTAL 15 54 67 82 12 0 0 0 0 0 0 0 230 NUMBER OF CALMS: 1 NUMBER OF INVALID HOURS: 0 NUMBER OF VALID HOURS: 231 TOTAL HOURS FOR THE PERIOD: 231 STABILITY CLASS G FROM 10/ 1/07 0:00 TO 12/31/07 23:00 PRIMARY SENSORS - 30 FOOT WIND SPEED (METERS/SECOND)

WIND .22- .51- .76- 1.1- 1.6- 2.1- 3.1- 5.1- 7.1- 10.1- 13.1- >18 TOT.

DIR .50 .75 1.0 1.5 2.0 3.0 5.0 7.0 10.0 13.0 18.0 N 5 21 8 8 1 0 0 0 0 0 0 0 43 NNE 25 19 5 7 0 1 0 0 0 0 0 0 57 NE 18 23 1 0 0 0 0 0 0 0 0 0 42 ENE 5 22 9 0 0 0 0 0 0 0 0 0 36 E 2 4 3 0 0 0 0 0 0 0 0 0 9 ESE 1 4 3 0 0 0 0 0 0 0 0 0 8 SE 2 0 0 1 0 0 0 0 0 0 0 0 3 SSE 1 1 4 0 1 0 0 0 0 0 0 0 7 S 0 6 1 1 0 0 0 0 0 0 0 0 8 SSW 0 2 1 0 0 0 0 0 0 0 0 0 3 SW 0 2 0 0 0 0 0 0 0 0 0 0 2 WSW 1 2 0 0 0 0 0 0 0 0 0 0 3 W 1 2 0 0 0 0 0 0 0 0 0 0 3 WNW 1 2 0 0 0 0 0 0 0 0 0 0 3 NW 2 9 6 0 0 0 0 0 0 0 0 0 17 NNW 5 18 16 3 0 0 0 0 0 0 0 0 42 TOTAL 69 137 57 20 2 1 0 0 0 0 0 0 286 NUMBER OF CALMS: 0 NUMBER OF INVALID HOURS: 0 NUMBER OF VALID HOURS: 286 TOTAL HOURS FOR THE PERIOD: 286 48

River Bend Station 2007 Regulatory Guide 1.21 4/15/2007 RIVER BEND STATION JOINT FREQUENCY TABLE ALL STABILITY CLASSES FROM 1/ 1/07 0:00 TO 3/31/07 23:00 PRIMARY SENSORS - 150 FOOT WIND SPEED (METERS/SECOND)

WIND .22- .51- .76- 1.1- 1.6- 2.1- 3.1- 5.1- 7.1- 10.1- 13.1- >18 TOT.

DIR . .50 .75 1.0 1.5 2.0 3.0 5.0 7.0 10.0 13.0 18.0 N 1 1 2 8 12 53 91 11 0 0 0 0 179 NNE 0 0 3 10 14 62 53 0 0 0 0 0 142 NE 0 0 1 6 3 20 72 2 0 0 0 0 104 ENE 0 0 0 2 10 22 24 18 0 0 0 0 76 E 1 0 2 4 11 21 18 10 1 0 0 0 68 ESE 0 0 1 3 4 27 256 76 1 0 0 0 368 SE 0 0 0 1 2 25 128 29 0 0 0 0 185 SSE 0 0 1 4 7 31 81 38 4 0 0 0 166 S 0 0 1 5 8 35 71 13- 9 0 0 0 142 SSW 0 0 1 3 7 38 53 8 1 0 0 0 111 SW 0 1 2 3 5 18 29 2 1 0 0 0 61 WSW 0 1 2 4 16 36 21 3 0 0 0 0 83 IW 0 0 2 6 12 22 21 1 0 0 0 0 64 WNW 0 0 11 6 7 21 22 6 4 0 0 0 67 NW 0 1 0 5 14 38 52 16 4 0 0 0 130 NNW 0 1 3 8 11 40 85 28 0 0 0 0 176 TOTAL 2 5 22 78 143 509 1077 261 25 0 0 0 2122 NUMBER OF CALMS: 0 NUMBER OF INVALID HOURS: 38 NUMBER OF VALID HOURS: 2122 TOTAL HOURS FOR THE PERIOD: 2160 STABILITY CLASS A FROM 1/ 1/07 0:00 TO 3/31/07 23:00 PRIMARY SENSORS - 150 FOOT WIND SPEED (METERS/SECOND)

WIND .22- .51- .76- 1.1- 1.6- 2.1- 3.1- 5.1- 7.1- 10.1- 13.1- >18 TOT.

DIR .50 .75 1.0 1.5 2.0 3.0 5.0 7.0 10.0 13.0 18.0 N 0 0 0 0 0 0 0 0 0 0 0 0 0 NNE 0 0 0 0 0 0 0 0 0 0 0 0 0 NE 0 0 0 0 0 0 5 0 0 0 0 0 5 ENE 0 0 0 0 0 2 6 1 0 0 0 0 9 E 0 0 0 0 2 4 1 0 0 0 0 0 7 ESE 0 0 0 0 2 4 49 7 1 0 0 0 63 SE 0 0 0 0 0 5 24 9 0 0 0 0 38 SSE 0 0 0 0 0 1 4 1 0 0 0 0 6 S 0 0 0 0 0 0 0 1 0 0 0 0 1 SSW 0 0 0 0 0 0 0 0 0 0 0 0 0 SW. 0 0 0 0 0 0 0 0 0 0 0 0 0 WSW 0 0 0 0 0 2 5 0 0 0 0 0 7 W 0 0 0 0 0 0 3 1 0 0 0 0 4 WNW 0 0 0 0 0 0 0 1 1 0 0 0 2 NW ý0 0 0 0 0 0 2 1 0 0 0 0 3 NNW 0 0 ..0 0 0 0 0 2 0 0 0 0 2 TOTAL 0 0 0 0 4 18 99 24 2 0 0 0 147 NUMBER OF CALMS: 0 NUMBER OF INVALID HOURS: 0 NUMBER OF VALID HOURS: 147 TOTAL HOURS FOR THE PERIOD: 147 49

River Bend Station 2007 Regulatory Guide 1.21 4/15/2007 RIVER BEND STATION JOINT FREQUENCY TABLE STABILITY CLASS B FROM 1/ 1/07 0:00 TO 3/31/07 23:00 PRIMARY SENSORS - 150 FOOT WIND SPEED (METERS/SECOND)

(

WIND .22- .51- .76- 1.1- 1.6- 2.1- 3.1- 5.1- 7.1- 10.1- 13.1- >18 TOT.

DIR .50 .75 1.0 1.5 2.0 3.0 5.0 7.0 10.0 13.0 18.0 N 0 0 0 0 0 0 3 0 0 0 0 0 3 NNE 0 0 0 0 0 0 2 0 0 0 0 0 2 NE 0 0 0 0 0 1 1 0 0 0 0 0 2 ENE 0 0 0 0 2 1 0 0 0 0 0 0 3 E 0 0 0 0 0 0 1 0 0 0 0 0 1 ESE 0 0 0 0 0 0 10 3 0 0 0 0 13 SE 0 0 0 0 0 1 3 1 0 0 0 0 5 SSE 0 0 0 0 0 1 1 4 0 0 0 0 6 S 0 0 0 0 0 0 2 2 0 0 0 0 4 SSW 0 0 0 0 0 0 0 0 0 0 0 0 0 SW 0 0 0 0 0 0 0 0 0 0 0 0 0 WSW 0 0 0 0 0 0 0 0 0 0 0 0 0 W 0 0 0 0 1 0 3 0 0 0 0 0 4 WNW 0 0 0 0 0 0 1 2 0 0 0 0 3 NW 0 0 0 0 0 2 1 5 0 0 0 0 8 NNW 0 0 0 0 0 0 1 3 0 0 0 0 4 TOTAL 0 0 0 0 3 6 29 20 0 0 0 0 58 NUMBER OF CALMS: 0 NUMBER OF INVALID HOURS: 0 NUMBER OF VALID HOURS: 58 TOTAL HOURS FOR THE PERIOD: 58 STABILITY CLASS C FROM 1/ 1/07 0:00 TO 3/31/07 23:00 PRIMARY SENSORS - 150 FOOT WIND SPEED (METERS/SECOND)

WIND .22- .51- .76- 1.1- 1.6- 2.1- 3.1- 5.1- 7.1- 10.1- 13.1- >18 TOT.

DIR .50 .75 1.0 1.5 2.0 3.0 5.0 7.0 10.0 13.0 18.0 N.....0....0....0.....0....0....0.....2....0....0.....0....0....0.....2.

N 0 0 0 0 0 0 2 0 0 0 0 0 2 NNE 0 0 0 0 0 0 0 0 0 0 0 0 0 NE 0 0 0 0 1 1 0 0 0 0 0 0 2 ENE 0 0 0 0 0 0 1 0 0 0 0 0 1 E 0 0 0 0 0 0 0 0 0 0 0 0 0 ESE 0 0 0 0 0 0 6 1 0 0 0 0 7 SE 0 0 0 0 0 1 3 0 0 0 0 0 4 SSE 0 0 0 0 0 0 1 3 0 0 0 0 4 S 0 0 0 0 0 0 2 2 0 0 0 0 4 SSW 0 0 0 0 0 0 0 0 0 0 0 0 0 SW 0 0 0 0 0 0 0 0 0 0 0 0 0 WSW 0 0 0 0 0 0 1 1 0 0 0 0 2 W 0 0 0 0 0 0 0 0 0 0 0 0 0 WNW 0 0 0 0 0 0 0 0 1 0 0 0 1 NW 0 1 0 0 0 0 1 1 1 0 0 0 4" NNW 0 0 0 0 0 0 1 2 0 0 0 0 3 TOTAL 0 1 0 0 1 2 18 10 2 0 0 0 34 NUMBER OF CALMS: 0 NUMBER OF INVALID HOURS: 0 NUMBER OF VALID HOURS: 34 TOTAL HOURS FOR THE PERIOD: 34 50

River Bend Station 2007 Regulatory Guide 1.21 4/15/2007 RIVER BEND STATION JOINT FREQUENCY TABLE STABILITY CLASS D FROM 1/ 1/07 0:00 TO 3/31/07 23:00 PRIMARY SENSORS - 150 FOOT WIND SPEED (METERS/SECOND)

WIND .22- .51- .76- 1.1- 1.6- 2.1- 3.1- 5.1- 7.1- 10.1- 13.1- >18 TOT.

DIR .50 .75 1.0 1.5 2.0 3.0 5.0 7.0 10.0 13.0 18.0 N 0 0 1 5 6 34 59 10 0 0 0 0 115 NNE 0 0 1 7 9 33 38 0 0 0 0 0 88 NE 0 0 0 4 1 7 26 1 0 0 0 0 39 ENE 0 0 0 0 3 4 6 6 0 0 .0 0 19 E 0 0 0 0 4 3 3 0 0 0 0 0 10 ESE 0 0 0 1 1 4 25 14 0 0 0 0 45 SE 0 0 0 0 0 6 32 12 0 0 0 0 50 SSE 0 0 0 0 1 4 45 21 3 0 0 0 74 S 0 0 0 0 2 6 31 6 9 0 0 0 54 SSW 0 0 1 1 2 10 22 6 1 0 0 0 43 SW 0 0 0 0 0 5 8 2 0 0 0 0 15 WSW 0 1 0 1 6 8 8 2 0 0 0 0 26 W 0 0 0 1 2 10 8 0 0 0 0 0 21 WNW 0 0 0 1 0 3 10 1 2 0 0 0 17 NW 0 0 0 1 7 17 24 3 2 0 0 0 54 NNW 0 0 0 5 6 13 50 20 0 0 0 0 94 TOTAL 0 1 3 27 50 167 395 104 17 0 0 0 764 NUMBER OF CALMS: 0 NUMBER OF INVALID HOURS: 0 NUMBER OF VALID HOURS: 764 TOTAL HOURS FOR THE PERIOD: 764 STABILITY CLASS E FROM 1/ 1/07 0:00 TO 3/31/07 23:00 PRIMARY SENSORS - 150 FOOT WIND SPEED (METERS/SECOND)

WIND .22- .51- .76- 1.1- 1.6- 2.1- 3.1- 5.1- 7.1- 10.1- 13.1- >18 TOT.

DIR .50 .75 1.0 1.5 2.0 3.0 5.0 7.0 10.0 13.0 18.0 N 0 0 0 1 2 7 17 1 0 0 0 0 28 NNE 0 0 0 1 2 11 8 0 0 0 0 0 22 NE 0 0 0 1 1 4 15 1 0 0 0 0 22 ENE 0 0 0 1 1 7 4 7 0 0 0 0 20 E 0 0 1 1 2 3 9 5 1 0 0 0 22 ESE 0 0 1 1 0 9 91 50 0 0 0 0 152 SE 0 0 0 1 1 7 32 7 0 0 0 0 48 SSE 0 0 0 1 1 8 19 9 1 0 0 0 39 S 0 0 0 3 2 9 27 2 0 0 0 0 43 SSW 0 0 0 0 1 8 18 2 0 0 0 0 29 SW 0 0 1 2 1 5 10 0 1 0 0 0 20 WSW 0 0 0 2 3 13 4 0 0 0 0 0 22 W 0 0 1 0 2 5 4 0 0 0 0 0 12 WNW 0 0 0 0 3 2 5 2 0 0 0 0 12 NW 0 0 0 0 2 5 15 6 1 0 0 0 29 NNW 0 0 1 2 1 15 19 1 0 0 0 0 39 TOTAL 0 0 5 17 25 118 297 93 4 0 0 0 559 NUMBER OF CALMS: 0 NUMBER OF INVALID HOURS: 0 NUMBER OF VALID HOURS: 559 TOTAL HOURS FOR THE PERIOD: 559 51

River Bend Station 2007 Regulatory Guide 1.21 4/15/2007 RIVER BEND STATION JOINT FREQUENCY TABLE STABILITY CLASS F FROM 1/ 1/07 0:00 TO 3/31/07 23:00 PRIMARY SENSORS - 150 FOOT WIND SPEED (METERS/SECOND)

WIND .22- .51- .76- 1.1- 1.6- 2.1- 3.1- 5.1- 7.1- 10.1- 13.1- >18 TOT.

DIR .50 .75 1.0 1.5 2.0 3.0 5.0 7.0 10.0 13.0 18.0 N 1 0 0 1 0 3 5 0 0 .0 0 0 10 NNE 0 0 0 1 1 6 4 0 0 0 0 0 12 NE 0 0 .1 0 0 2 17 0 o 0 0 0 20 ENE 0 0 0 1 1 3 5 3 0 0 0 0 13 ESE 0 0 0 2 1 6 2 5 0 0 0 0 16 ESE 0 0 0 0 0 6 54 1 0 0 0 0 61 SE 0 0 0 0 1 3 23 0 0 0 0 0 27 SSE 0 0 1 0 1 4 2 0 0 0 0 0 8 S 0 0 0 1 1 9 3 0 0 0 0 0 14 SSW 0 0 0 1 2 14 11 0 0 0 0 0 28.

SW 0 0 0 0 3 6 8 0 0 0 0 0 17 WSW 0 0 0 0 1 5 2 0 0 0 0 0 8 W 0 0 0 0 0 2 0 0 0 0 0 0 2 WNW 0 0 0 0 0 2 2 0 0 0 0 0 4 NW 0 0 0 0 1 5 5 0 0 0 0 0 11 NNW 0 0 0 0 1 4 5 0 0 0 0 0 10 TOTAL 1 0 2 7 14 80 148 9 0 0 0 0 261 NUMBER OF CALMS: 0 NUMBER OF INVALID HOURS: 0 NUMBER OF VALID HOURS: 261 TOTAL HOURS FOR THE PERIOD: 261 STABILITY CLASS G FROM 1/ 1/07 0:00 TO 3/31/07 23:00 PRIMARY SENSORS - 150 FOOT WIND SPEED (METERS/SECOND)

WIND .22- .51- .76- 1.1- 1.6- 2.1- 3.1- 5.1- 7.1- 10.1- 13.1- >18 TOT.

DIR .50 .75 1.0 1.5 2.0 3.0 5.0 7.0 10.0 13.0 18.0 N 0 1 1 1 4 9 5 0 0 0 0 0 21 NNE 0 0 2 1 2 12 1 0 0 0 0 0 18 NE 0 0 0 1 0 5 8 0 0 0 0 0 14 ENE o 0 0 0 3 5 2 1 0 0 0 0 11 E 1 0 1 1 2 5 2 0 0 0 0 0 12 ESE 0 0 0 1 1 4 21 0 0 0 "0 0 27 SE 0 0 0 0 0 2 11 0 0 0 0 0 13 SSE o 0 0 3 4 13 9 0 0 0 0 0 29 S o 0 1 1 3 11 6 0 0 0 0 0 22 SSW o 0 0 1 2 6 2 0 0 0 0 0 11 SW o 1 1 1 1 2 3 0 0 0 0 0 9 WSW 0 0 2 1 6 8 1 0 0 0 0 0 18 W 0 0 1 5 7 5 3 0 0 0 0 0 21 WNW 1 5 4 14 4 0 0 0 0 0 28 NW 0 0 0 4 4 9 4 0 0 0 0 0 21 NNW 0 1 2 1 3 8 9 0 0 0 0 0 24 TOTAL 1 3 12 27 46 118 91 1 0 0 0 0 299 NUMBER OF CALMS: 0 NUMBER OF INVALID HOURS: 0 NUMBER OF VALID HOURS: 299 TOTAL HOURS FOR THE PERIOD: 299 52

River Bend Station 2007 Regulatory Guide 1.21 4/15/2007 RIVER BEND STATION JOINT FREQUENCY TABLE ALL STABILITY CLASSES FROM 4/ 1/07 0:00 TO 6/30/07 23:00 PRIMARY SENSORS - 150 FOOT WIND SPEED (METERS/SECOND)

WIND .22- .51- .76- 1.1- 1.6- 2.1- 3.1- 5.1- 7.1- 10.1- 13.1- >18 TOT.

DIR .50 .75 1.0 1.5 2.0 3.0 5.0 7.0 10.0 13.0 18.0 N 0 1 1 6 7 29 54 2 0 0 0 0 100 NNE 0 1 1 8 13 33 68 4 0 0 0 0 128 NE 1 0 5 13 9 40 55 5 0 0 0 0 128 ENE 0 0 4 10 15 49 35 7 0 0 0. 0 120 E 0 0 1 8 18 70 47 0 0 0 0 0 144 ESE 0 0 3 11 12 74 207 14 1 0 0 0 322 SE 0 1 2 4 5 50 139 15 2 0 0 0 218 SSE 0 0 0 3 12 38 79 28 1 0 0 0' 161 S 0 0 1 8 14 44 63 8 0 0 0 0 138 SSW 0 0 1 7 16 40 31 2 0 0 0 0 97 Sw 0 0 2 8 15 27 5 0 0 0 0 0 57 WSW 0 1 0 8 15 39 8 0 0 0 0 0 71 W 0 0 1 5 26 48 11 1 0 0 0 0 92 WNW 0 0 1 11 13 42 14 3 3 0 0 0 87 NW 0 0 4 6 11 29 21 13 7 0 0 0 91 NNW 0 2 0 5 8 25 37 4 1 0 0 0 82 TOTAL 1 6 27 121 209 677 874 106 15 0 0 0 2036 NUMBER OF CALMS: 1 NUMBER OF INVALID HOURS: 147 NUMBER OF VALID HOURS: 2037 TOTAL HOURS FOR THE PERIOD: 2184 STABILITY CLASS A FROM 4/ 1/07 0:00 TO 6/30/07 23:00 PRIMARY SENSORS - 150 FOOT WIND SPEED (METERS/SECOND)

WIND .22- .51- .76- 1.1- 1.6- 2.1- 3.1- 5.1- 7.1- 10.1- 13.1- >18 TOT.

DIR .50 .75 1.0 1.5 2.0 3.0 5.0 7.0 10.0 13.0 18.0 N 0 0 0 1 1 8 4 0 0 0 0 0 14 NNE 0 0 6 0 4 5 21 1 .0 0 0 0 31 NE 1 0 1 2 2 15 19 1 0 0 0 0 41 ENE 0 0 1 '0 0 11 15 2 0 0 0 0 29 E 0 0 0 0 2 7 16 0 0 0 0 0 25 ESE 0 0 0 0 0 7 52 11 1 0 0 0 71 SE 0 0 0 0 2 8 47 9 2 0 0 0 68 SSE 0 0 0 0 1 10 5 7 0 0 0 0 23 S 0 0 0 0 0 4 9 0 0 0 0 0 13 SSW 0 0 0 0 2 5 2 0 0 0 0 0 9 Sw 0 0 0 0 1 6 0 0 0 0 0 0 7 WSW 0 0 0 0 2 9 4 0 0 0 0 0 15 W 0 0 0 1 5 15 6 1 0 0 0 0 28 WNW 0 0 0 1 2 8 5 2 1 0 0 0 19 NW 0 0 0 0 1 4 3 1 3 0 0 0 12 NNW 0 0 0 0 1 2 3 1 0 0 0 0 7 TOTAL 1 0 2 5 26 124 211 36 7 0 0 0 412 NUMBER OF CALMS: 0 NUMBER OF INVALID HOURS: 0 NUMBER OF VALID HOURS: 412 TOTAL HOURS FOR THE PERIOD: 412 53

River Bend Station 2007 Regulatory Guide 1.21 4/15/2007 RIVER BEND STATION JOINT FREQUENCY TABLE STABILITY CLASS B FROM 4/ 1/07 0:00 TO 6/30/07 23:00 PRIMARY SENSORS - 150 FOOT WIND SPEED (METERS/SECOND)

WIND .22- .51- .76- 1.1- 1.6- 2.1- 3.1- 5.1- 7.1- 10.1- 13.1- >18 TOT.

DIR .50 .75 1.0 1.5 2.0 3.0 5.0 7.0 10.0 13.0 18.0 N 0 0 0 0 0 1 4 1 0 0 0 0 6 NNE 0 0 0 0 0 0 0 1 0 0 0 0 1 NE 0 0 0 0 0 0 1 0 0 0 0 0 1 ENE 0 0 0 0 0 0 0 0 0 0 0 0 0 E 0 0 0 0 0 1 1 0 0 0 0 0 2 ESE 0 0 0 0 0 0 2 0 0 0 0 0 4 SE 0 0 0 0 0 0 5 0 0 0 0 0 5 SSE 0 0 0 0 0 0 2 3 0 0 0 0 5 S 0 0 0 0 0 2 6 1 0 0 0 0 9 SSW 0 0 0 0 0 0 0 0 0 0 o 0 0 Sw 0 0 0 0 1 2 0 0 0 0 0 0 3 wSw 0 0 0 0 3 0 0 0 0 0 0 0 3 W 0 0 0 0 1 1 1 0 0 0 0 0 3)

WNW 0 0 0 0 1 2 1 1 1 0 0 0 6 NW 0 0 0 0 1 2 1 3 0 0 0 0 7 NNW 0 0 0 0 0 1 1 2 1 0 0 0 5 TOTAL 0 0 0 0 7 12 25 14 2 0 0 0 60 NUMBER OF CALMS: 0 NUMBER OF INVALID HOURS: 0 NUMBER OF VALID HOURS: 60 TOTAL HOURS FOR THE PERIOD: 60 STABILITY CLASS C FROM 4/ 1/07 0:00 TO 6/30/07 23:00 PRIMARY SENSORS - 150 FOOT WIND SPEED (METERS/SECOND)

WIND .22- .51- .76- 1.1- 1.6- 2.1- 3.1- 5.1- 7.1- 10.1- 13.1- >18 TOT.

DIR .50 .75 1.0 1.5 2.0 3.0 5.0 7.0 10.0 13.0 18.0 N 0 0 0 0 0 1 2 0 0 0 0 0 3 NNE 0 0 0 0 0 0 1 0 0 0 0 0 1 NE 0 0 0 0 1 0 0 0 0 0 0 0 1 ENE 0 0 0 0 0 0 0 0 0 0 0 0 0 E 0 0 0 0 0 3 1 0 0 0 0 0 4 ESE 0 0 0 0 0 0 4 0 0 0 0 0 4 SE 0 0 0 0 0 0 1 1 0 0 0 0 2 SSE 0 0 0 0 0 0 0 1 0 0 0 0 1 S 0/0 0 0 2 1 1 0 0 0 0 0 4 SSW 0 0 0 0 0 1 1 0 0 0 0 0 2 SW 0 0 0 0 0 1 0 0 0 0 0 0 1 WSW 0 0 0 0 0 1 0 0 0 0 0 0 1 W 0 0 0 0 1 0 1 0 0 0 0 0 2 WNW 0 0 0 0 1 0 0 0 0 0 0 0 1 NW 0 0 0 0 1 0 3 0 0 0 0 0 4 NNW 0 0 0 0 0 1 3 0 0 0 0 0 4 TOTAL 0 0 0 0 6 9 18 2 0 0 0 0 35 NUMBER OF CALMS: 0 NUMBER OF INVALID HOURS: 1 NUMBER OF VALID HOURS: 35 TOTAL HOURS FOR THE PERIOD: 36 54

River Bend Station 2007 Regulatory Guide 1.21 4/15/2007 RIVER BEND STATION JOINT FREQUENCY TABLE STABILITY CLASS D FROM 4/ 1/07 0:00 TO 6/30/07 23:00 PRIMARY SENSORS - 150 FOOT' WIND SPEED (METERS/SECOND)

WIND .22- .51- .76- 1.1- 1.6- 2.1- 3.1- 5.1- 7.1- 10.1- 13.1- >18 TOT.

DIR .50 .75 1.0 1.5 2.0 3.0 5.0 7.0 10.0 13.0 18.0 N 0 0 0 0 1 2 17 0 0 0 0 0 20 NNE 0 0 0 1 0 5 5 0 0 0 0 0 11 NE 0 0 1 1 0 7 4 1 0 0 0 0 14 ENE 0 0 0 2 2 3 3 0 0 0 0 0 10 E 0 0 0 1 1 6 4 0 0 0 0 0 12 ESE 0 0 0 2 0 8 20 1 0 0 0 0 31 SE 0 0 0 1 0 6 26 3 0 0 0 0 36 SSE 0 0 0 1 2 9 33 14 1 0 0 0 60 S 0 0 0 1 0 11 20 4 0 0. 0 0 36 SSW 0 0 0 0 3 7 11 1 0 0 0 0 22 SW 0 0 0 1 3 3 2 0 0 0 0 0 9 WSW 0 1 0 2 1 2 3 0 0 0 0 0 9 W 0 0 0 2 5 7 2 0 0 0 0 0 16 WNW 0 0 0' 2 2 7 3 0 1 0 0 0 15 NW 0 0 0 0 2 2 6 9 4 0 0 0 23 NNW 0 0 0 1. 0 7 5 1 0 0 0 0 14 TOTAL 0 1 1 18 22 92 164 34 6 0 0 0 338 NUMBER OF CALMS: 0 NUMBER OF INVALID HOURS: 4 NUMBER OF VALID HOURS: 338 TOTAL HOURS FOR THE PERIOD: 342 STABILITY CLASS E FROM 4/ 1/07 0:00 TO 6/30/07 23:00 PRIMARY SENSORS - 150 FOOT WIND SPEED (METERS/SECOND)

WIND .22- .51- .76- 1.1- 1.6- 2.1- 3.1- 5.1- 7.1- 10.1- 13.1- >18 TOT.

DIR .50 .75 1.0 1.5 2.0 3.0 5.0 7.0 10.0 13.0 18.0 N 0 1 0 1 3 9 7 1 0 0 0 0 22 NNE 0 1 0 2 6 8 17 2 0 0 0 0 36 NE 0 0 1 3 4 6 3 1 0 0 0 0 18 ENE 0 0 0 6 5 14 2 2 0o 0 0 0 29 E 0 0 0 1 8 20 14 0 0 0 0 0 43 ESE 0 0 1 3 2 33 70 0 0 0 0 0 109 SE 0 0 0 2 0 12 37 2 0 0 0 0 53 SSE 0 0 0 1 4 8 30 3 0 0 0 0 46 S 0 0 0 3 5 13 20 1 0 0 0 0 42 SSW 0 0 0 2 4 18 14 1 0 0 0 0 39 SW 0 0 2 1 4 5 2 0 0 0 0 0 14 WSW 0 0 0 4 5 12 1 0 0 0 0 0 22 W 0 0 0 1 6 9 1 0 0 0 0 0 17 WNW 0 0 0 1 5 7 2 0 0 0 0 0 15 NW 0 0 0 2 4 4 2 0 0 0 0 0 12 NNW 0 0 0 3 6 8 10 0 0 0 0 0 27 TOTAL 0 2 4 36 71 186 232 13 0 0 0 0 544 NUMBER OF CALMS: 1 NUMBER OF INVALID HOURS: 18 NUMBER OF VALID HOURS: 545

• TOTAL HOURS FOR THE PERIOD: *563 55

River Bend Station 2007 Regulatory Guide 1.21 4/15/2007 RIVER BEND STATION JOINT FREQUENCY-TABLE STABILITY CLASS F FROM 4/ 1/07 0:00 TO 6/30/07 23:00 PRIMARY SENSORS - 150 FOOT WIND SPEED (METERS/SECOND)

WIND .22- .51- .76- 1.1- 1.6- 2.1- 3.1- 5.1- 7.1- 10.1- 13.1- >18 TOT.

DIR .50 .75 1.0 1.5 2.0 3.0 5.0 7.0 10.0 13.0 18.0 N 0 0 0 2 1 3 8 0 0 0 0 0 14 NNE 0 0 0 0 1 7 9 0 0 0 0 0 17 NE 0 0 2 3 1 2 10 2 0 0 0 0 20 ENE 0 0 2 1 4 14 6 3 0 0 0 0 30 E 0 0 1 2 5 22 6 0 0 0 0 0 36 ESE 0 0 1 3 6 16 39 0 0 0 0 0 65 SE 0 1 1 0 2 18 15 0 0 0 0 0 37 SSE 0 0 0 1 2 5 7 0 0 0 0 0 15 S 0 0 0 1 2 6 6 1 0 0 0 0 16 SSW 0 0 1 r5 2 5 1 0 0 0 0 0 14 SW 0 0 0 1 4 4 0 0 0 0 0 0 9 WSW 0 0 0 1 2 6 0 0 0 0 0 0 9 W 0 0 1 0 5 '6 0 0 0 0 0 0 12 WNW 0 0 1 3 0 8 2 0 0 0 0 0 14 NW 0 0 2 2 0 10 4 0 0 0 0 0 18 NNW 0 1 0 1 0 1 1 0 0 0 0 0 4 TOTAL 0 2 12 26 37 133 114 6 0 0 0 0 330 NUMBER OF CALMS: 0 NUMBER OF INVALID HOURS:, 0 NUMBER OF VALID HOURS: 330 TOTAL HOURS FOR THE PERIOD: 330 STABILITY CLASS G FROM 4/ 1/07 0:00 TO 6/30/07 23:00 PRIMARY SENSORS - 150 FOOT WIND SPEED (METERS/SECOND)

WIND '.22- .51- .76- 1.1- 1.6- 2.1- 3.1- 5.1- 7.1- 10.1- 13.1- >18 TOT.

DIR .50 .75 1.0 1.5 2.0 3.0 5.0 7.0 10.0 13.0 18.0 N 0 0 1 2 1 5 12 0 0 0 0 0 21 NNE 0 0 1 5 2 8 15 0 0 0 0 0 31 NE 0 0 0 4 1 10 18 0 0 0 0 0 33 ENE 0 0 1 1 4 7 9 0 0 0 0 0 22 E 0 0 0 4 2 11 5 0 0 0 0 0 22 ESE 0 0 1 3 4 10 20 0 0 0 0 0 38 SE 0 0 1 1 1 6 8 0 0 0 0 0 17 SSE 0 0 0 0 3 6 2 0 0 0 0 0 11 S 0 0 1 3 5 7 1 1 0 0 0 0' 18 SSW 0 0 0 0 5 4 2 0 0 0 0 0 11 SW 0 0 0 5 2 6 1 0 0 0 0 0 14 WSW 0 0 0 1 2 9 0 0 0 0 0 0 12 w 0 0 0 1 3 10 0 0 0 0 0 0 14 WNW 0 0 0 4 2 10 1 0 0 0 0 0 17 NW 0 0 2 2 2 7 2 0 0 0 0 0 15 NNW 0 1 0 0 1 5 14 0 0 0 0 0 21 TOTAL 0 1 8 36 40 121 110 1 0 0 0 0 317 NUMBER OF CALMS: 0 NUMBER OF INVALID HOURS: 0 NUMBER OF VALID HOURS: 317 TOTAL HOURS FOR THE PERIOD: 317 56

River Bend Station 2007 Regulatory Guide 1.21 4/15/2007 RIVER BEND STATION JOINT FREQUENCY TABLE ALL STABILITY CLASSES FROM 7/ 1/07 0:00 TO 9/30/07 23:00 PRIMARY SENSORS - 150 FOOT WIND SPEED (METERS/SECOND)

WIND .22- .51- .76- 1.1- 1.6- 2.1- 3.1- 5.1- 7.1- 10.1- 13.1- >18 TOT.

DIR .50 .75 1.0 1.5 2.0 3.0 5.0 7.0 10.0 13.0 18.0 N 0 1 4 11 14 33 29 0 0 0 0 0 92 NNE 0 0 3 7 13 34 53 0 0 0 0 0 110 NE 0 1 3 13 20 53 73 1 0 0 0 0 164 ENE 0 0 2 17 29 75 36 2 0 0 0 0 161 E 0 3 3 12 24 49 25 0 0 0 0 0 116 ESE 0 0 0 17 17 82 162 14 0 0 0 0 292 SE 0 0 1 7 19 63 65 3 0 0 0 0 158 SSE 0 0 3 6 15 74 24 5 1 0 0 0 128 S 0 1 0 20 21 45 36 3 0 0 0 0 126 SSW 0 1 2 4 23 43 29 0 0 0 0 0 102 SW 1 1 1 12 21 39 14 0 0 0 0 0 89 WSW 0 0 2 12 24 61 20 0 0 0 0 0 119 W 0 0 3 7 31 90 25 0 0 0 0 0 156 WNW 0 1 3 12 15 36 18 0 0 0 0 0 85 NW 0 0 2 11 15 25 7 0 0 0 0 0 60 NNW 0 0 2 12 14 29 28 0 0 0 0 0 85 TOTAL 1 9 34 180 315 831 644 28 1 0 0 0 2043 NUMBER OF CALMS: 0 NUMBER OF INVALID HOURS: 165 NUMBER OF VALID HOURS: 2043 TOTAL HOURS FOR THE PERIOD: 2208 STABILITY CLASS A FROM 7/ 1/07 0:00 TO 9/30/07 23:00 PRIMARY SENSORS - 150 FOOT WIND SPEED (METERS/SECOND)

WIND .22- .51- .76- 1.1- 1.6- 2.1- 3.1- 5.1- 7.1- 10.1- 13.1- >18 TOT.

DIR .50 .75 1.0 1.5 2.0 3.0 5.0 7.0 10.0 13.0 18.0 N 0 0 0 0 0 0 0 0 0 0 0 0 0 NNE 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 ENE 0 0 0 0 0 0 0 1 0 0 0 0 1 E 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 SE 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 S 0 0 0 0 0 0 0 0 0 0 0 0 0 SSW 0 0 0 0 0 0 0 0 0 0 0 0 0 SW 0 0 0 0 0 0 0 0 0 0 0 0 0 WSW 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 WNW 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 NNW 0 0 0 0 0 0 0 0 0 0 0 0 0 TOTAL 0 0 0 0 0 0 0 1 0 0 0 0 1 NUMBER OF CALMS: 0 NUMBER OF INVALID HOURS: 0 NUMBER OF VALID HOURS: 1 TOTAL HOURS FOR THE PERIOD: 1 57

River Bend Station 2007 Regulatory Guide 1.21 4/15/2007 RIVER BEND STATION JOINT FREQUENCY TABLE STABILITY CLASS B FROM 7/ 1/07 0:00 TO 9/30/07 23:00 PRIMARY SENSORS - 150 FOOT WIND'SPEED (METERS/SECOND)

WIND .22- .51- .76- 1.1- 1.6- 2.1- 3.1- 5.1- 7.1- 10.1- 13.1- >18 TOT.

DIR .50 .75 1.0 1.5 2.0 3.0 5.0 7.0 10.0 13.0 18.0 N 0 0 0 0 0 0 0 0 0 0 0 0 0 NNE 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 ENE 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 ESE 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 SSE 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 0 0 SSW 0 0 0 0 0 0 0 0 0 0 0 0 0 SW 0 0 0 0 0 0 0 0 0 0 0 0 0 WSW 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 WNW 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 NNW 0 0 0 0 0 0 0 0 0 o0 0 0 0 TOTAL 0 0 0 0 0 0 0 0 0 0 0 0 0 NUMBER OF CALMS: 0 NUMBER OF INVALID HOURS: 0 NUMBER OF VALID HOURS: 0 TOTAL HOURS FOR THE PERIOD: 0 STABILITY CLASS C FROM 7/ 1/07 0:00 TO 9/30/07 23:00 PRIMARY SENSORS - 150 FOOT WIND SPEED (METERS/SECOND)

WIND .22- .51- .76- 1.1- 1.6- 2.1- 3.1- 5.1- 7.1- 10.1- 13.1- >18 TOT.

DIR .50 .75 1.0 1.5 2.0 3.0 5.0 7.0 10.0 13.0 18.0 N 0 0 0 0 0 0 0 0 0 0 0 0 0 NNE 0 0 0 0 0 0 0 0 0 0 0 0 0 NE 0 0 0 0 0 '0 1 0 0 0 0 0 1 ENE 0 0 0 0 0 0 0 0 0 0 0 0 0 E 0 0 0 0 0 1 0 0 0 0 0 0 .0 ESE 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 SSE 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 0 0 Ssw 0 0 0 0 0 0 0 0 0 0 0 0 0 SW 0 0 0 0 0 0 0 0 0 0 0 0 0 wsw 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 WNW 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 NNW 0 0 0 0 0 0 0 0 0 0 0 0 0 TOTAL 0 0 0 0 0 1 1 0 0 0 0 0 2 NUMBER OF CALMS: 0 NUMBER OF INVALID HOURS: 0 NUMBER OF VALID HOURS: 2 TOTAL HOURS FOR THE PERIOD: 2 58

River Bend Station 2007 Regulatory Guide 1.21 4/15/2007 RIVER BEND STATION JOINT FREQUENCY TABLE STABILITY.CLASS D FROM 7/ i/07 0:00 TO 9/30/07 23:00 PRIMARY SENSORS - 150 FOOT WIND SPEED (METERS/SECOND)

WIND .22- .51- .76- 1.1- 1.6- 2.1- 3;1- 5.1- 7.1- 10.1- 13.1- >18 TOT.

DIR .50 .75 1.0 1.5 2.0 3.0 5.0 7.0 10.0 13.0 18.0 N 0 0 I 0 1 1 0 0 0 0 0 0 3 NNE 0 0 0 3 0 2 2 0 0 0 0 0 7 NE 0 0 0 2 3 6 16 0 0 0 0 0 27 ENE 0 0 0 2 7 21 9 0 0 0 0 0 39 E 0 0 1 0 5 6 9 0 0 0 0 0 21 ESE 0 0 0 3 0 11 27 7 0 0 0 0 48 SE 0 0 0 0 2 10 9 1 0 0 0 0 22 SSE 0 0 0 0 1 8 7 2 0 0 0 0 18 S 0 0 0 2 1 1 4 0 0 0 0 0 8 SSW 0 0 1 0 0 1 8 0 0 0 0 0 10 SW 0 0 0 0 0 1 5 0 0 0 0 0 6 WSW 0 0 0 0 1 5 2 0 0 0 0 0 8 W 0 0 0 0 2 7 3 0 0 0 0 0 12 WNW 0 0 0 1 1 8 6 0 0 0 0 0 16 NW 0 0 1 3 3 4 1 0 0 0 0 0 12 NNW 0 0 0 1 1 1 1 0 0 0 0 0 4 TOTAL 0 0 4 17 28 93 109 10 0 0 0 0 261 NUMBER OF CALMS: 0 NUMBER OF INVALID HOURS: 0 NUMBER OF VALID HOURS: 261 TOTAL HOURS FOR THE PERIOD: 261 STABILITY CLASS E FROM 7/ 1/07 0:00 TO 9/30/07 23:00 PRIMARY SENSORS - 150 FOOT WIND SPEED (METERS/SECOND)

WIND .22- .51- .76- 1.1- 1.6- 2.1- 3.1- 5.1- 7.1- 10.1- 13.1- >18 TOT.

DIR .50 .75 1.0 1.5 2.0 3.0 5.0 7.0 10.0 13.0 18.0 N 0 1 1 5 6 10 12 0 0 0 0 0 35 NNE 0 0 2 1 4 16 25 0 0 0 0 0 48 NE 0 0 0 3 9 31 30 1 0 0 0 0 74

,ENE 0 0 2 7 10- 43 22 1 0 0 0 0 85 E 0 0 0 2 6 27 14 0 0 0 0 0 49 ESE 0 0 0 4 12 44 91 7 0 0 0 0 158 SE 0 0 0 2 9 27 39 2 0 0 0 0 79 SSE 0 0 1 2 8 28 8 3 1 0 0 0 51 S 0 0 0 5 11 16 14 2 0 0 0 0 48 SSW 0 0 0 2 9 15 8 0 0 0 0 0 34 SW 1 0 0 2 7 10 3 0 0 0 0 0 23 WSW 0 0 1 2 8 25 13 0 0 0 0 0 49 W 0 0 1 3 4 49 20 0 0 0 0 0 77 WNW 0 0 2 2 3 6 10 0 0 0 0 0 23 NW 0 0 0 6 2 11 4 0 0 0 0 0 23 NNW 0 0 0 2 4 11 20 0 0 0 0 0 37 TOTAL 1 1 10 50 112 369 333 16 1 0 0 0 893 NUMBER OF CALMS: 0 NUMBER OF INVALID HOURS: 0 NUMBER OF VALID HOURS: 893 TOTAL HOURS FOR THE PERIOD: 893 59

River Bend Station 2007 Regulatory Guide 1.21 4/15/2007 RIVER BEND STATION JOINT FREQUENCY TABLE STABILITY CLASS F FROM 7/ 1/07 0:00 TO 9/30/07 23:00 PRIMARY SENSORS - 150 FOOT WIND SPEED (METERS/SECOND)

WIND .22- .51- .76- 1.1- 1.6- 2.1- 3.1- 5.1- 7.1- 10.1- 13.1- >18 TOT.

DIR .50 .75 1.0 1.5 2.0 3.0 5.0 7.0 10.0 13.0 18.0 N 0 0 1 3 2 18 6 0 0 0 0 0 30 NNE 0 0 0 2 7 12 14 0 0 0 0 0 35 NE 0 1 3 6 6 14 13 0 0 0 0 0 43 ENE 0 0 0 7 10 10 5 0 0 0 0 0 32 E 0 1 1 8 12 14 2 0 0 0 0 0 38 ESE 0 0 0 9 4 20 38 0 0 0 0 0 71 SE 0 0 1 4 6 18 17 0 0 0 0 0 46 SSE 0 0 2 4 3 25 9 0 0 0 0 0 43 S 0 0 0 10 6 20 15 1 0 0 0 0 52 SSW 0 1 0 1 8 16 11 0 0 0 0 0 37 SW 0 1 0 6 11 18 6 0 0 0 0 0 42 WSW 0 0 1 6 5 21 5 0 0 0 0 0 38 W 0 0 0 2 20 31 1 0 0 0 0 0 54 WNW 0 1 1 4 2 18 1 0 0 0 0 0 27 NW 0 0 0 1 7 7 2 0 0 0 0 0 17 NWW 0 0 1 5 5 4 3 0 0 0 0 0 18 TOTAL 0 5 11 78 114 266 148 1 0 0 0 0 623 NUMBER OF CALMS: 0 NUMBER OF INVALID HOURS: 0 NUMBER OF VALID HOURS: 623 TOTAL HOURS FOR THE PERIOD: 623 STABILITY CLASS G FROM 7/ 1/07 0:00 TO 9/30/07 23:00 PRIMARY SENSORS - 150 FOOT WIND SPEED (METERS/SECOND)

WIND .22- .51- .76- 1.1- 1.6- 2.1- 3.1- 5.1- 7.1- 10.1- 13.1- >18 TOT.

DIR -. 50 .75 1.0 1.5' 2.0 3.0 5.0 7.0 10.0 13.0 18.0 N 0 0 1 3 5 4 11 0 0 0 I.

0 0 24 NNE 0 0 1 1 2 4 12 0 0 0 0 0 20 NE 0 0 0 2 2 2 13 0 0 0 0 0 19 ENE 0 0 0 1 2 1 0 0 0 0 0 0 4 E 0 2 1 2 1 1 0 0 0 0 0 0 7 ESE 0 0 0 1 1 7 6 0 0 0 0 0 15 SE 0 0 0 1 2 8 0 0 0 0 0 0 11 SSE 0 0 0 0 3 13 0 0 0 0 0 0 16 S 0 1 0 3 3 8 3 0 0 0 0 0 18 SSW 0 0 1 1 6 11 2 0 0 0 0 0 21 SW 0 0 1 4 3 10 0 0 0 0 0 0 18 WSW 0 0 0 4 10 10 0 0 0 0 0 0 24 W 0 0 2 2 5 3 1 0 0 0 0 0 13 WNW / 0 0 0 5 9 4 1 0 0 0 0 0 19 NW 0 0 1 1 3 3 0 0 0 0 0 0 8 NNW 0 0 1 4 4 13 4 0 0 0 0 0 26 TOTAL 0 3 9 35 61 102 53 0 0 0 0 0 263 NUMBER OF CALMS: 0 NUMBER OF INVALID HOURS: 0 NUMBER OF VALID HOURS: 263 TOTAL HOURS FOR THE PERIOD: 263 60

River Bend Station 2007 Regulatory Guide 1.21 4/15/2007 RIVER BEND STATION JOINT FREQUENCY TABLE ALL STABILITY CLASSES FROM 10/ 1/07 0:00 TO 12/31/07 23:00 PRIMARY SENSORS - 150 FOOT WIND SPEED (METERS/SECOND)

WIND .22- .51- .76- 1.1- 1.6- 2.1- 3.1- 5.1- 7.1- 10.1- 13.1- >18 TOT.

DIR .50 .75 1.0 1.5 2.0 3.0 5.0 7.0 10.0 13.0 18.0 N 1 6 8 10 22 59 118 24 0 0 0 0 248 NNE 0 0 1 4 8 68 128 6 0 0 0 0 215 NE 0 0 0 4 13 52 131 10 0 0 0 0 210 ENE 1 0 0 3 9 45 75 13 0 0 0 0 146 E 0 0 1 4 13 43 43 14 3 0 0 0 121 ESE 0 0 0 2 9 50 234 35 3 0 0 0 333 SE 0 0 1 2 9 41 150 14 0 0 0 0 217 SSE 0 0 0 4 9 26 71 8 1 0 0 0 119 S 0 0 0 3 5 48 45 0 0 0 0 0 101 SSW 0 0 0 2 11 35 25 5 0 0 0 0 78 SW 0 0 0 3 7 15 18 3 0 0 0 0 46 WSW 0 0 1 5 6 20 9 1 0 0 0 0' 42 W 0 2 0 2 6 25 18 2 0 0 0 0 55 WNW 0 0 1 2 4 8 33 20 2 0 0 0 70 NW 0 1 0 0 7 12 35 16 5 0 0 0 76 NNW 0 0 0 0 3 24 51 9 0 0 0 0 87 TOTAL 2 9 13 50 141 571 1184 180 14 0 0 0 2164 NUMBER OF CALMS: 0 NUMBER OF INVALID HOURS: 44 NUMBER OF VALID HOURS: 2164 TOTAL HOURS FOR THE PERIOD: 2208 STABILITY CLASS A FROM 10/ 1/07 0:00 TO 12/31/07 23:00 PRIMARY SENSORS - 150 FOOT WIND SPEED (METERS/SECOND)

WIND .22- .51- .76- 1.1- 1.6- 2.1- 3.1- 5.1- 7.1- 10.1- 13.1- >18 TOT.

DIR .50 .75 1.0 1.5 2.0 3.0 5.0 7.0 10.0 13.0 18.0 N 0 0 0 0 1 0 2 1 0 0 0 0 4 NNE 0 0 0 1 0 0 10 2 0 0 0 0 13 NE 0 0 0 0 0 4 11 3 0 0 0 0 , 18 ENE 0 0 0 0 0 2 10 1 0 0 0 0 13 E 0 0 0 0 0 5 5 2 0 0 0 0 12 ESE 0 0 0 0 0 6 19 1 0 0 0 0 26 SE 0 0 0 0 0 1 16 1 0 0 0 0 18 SSE 0 0 0 0 0 0 2 0 0 0 0 0. 2 S 0 0 0 0 0 0 0 0 0 0 0 0 0 SSW 0 0 0 0 0 0 1 0 0 0 0 0 1 SW 0 0 0 0 0 0 0 0 0 0 0 0 0 WSW 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 WNW 0 0 0 0 0 0 1 0 0 0 0 0 1 NW 0 0 0 0 0 0 1 0 0 0 0 0 1 NNW 0 0 0 0 0 0 0 0 0 0 0 0 0 TOTAL 0 0 0 1 1 18 78 11 0 0 0 0 109 NUMBER OF CALMS: 0 NUMBER OF INVALID HOURS: 1 NUMBER OF VALID HOURS: 109 TOTAL HOURS FOR THE PERIOD: 110 61

River Bend Station 2007 Regulatory Guide 1.21 4/15/2007 RIVER BEND STATION JOINT FREQUENCY TABLE STABILITY CLASS B FROM 10/ 1/07 0:00 TO 12/31/07 23:00 PRIMARY SENSORS - 150 FOOT WIND SPEED (METERS/SECOND)

WIND .22- .51- .76- 1.1- 1.6- 2.1- 3.1- 5.1- 7.1- 10.1- 13.1- >18 TOT.

DIR .50 .75 1.0 1.5 2.0 3.0 5.0 7.0 10.0 13.0 18.0 N 0 0 0 0 0 1 19 7 0 0 0 0 27 NNE 0 0 0 0 0 2 4 0 0 0 0 0 6 NE 0 0 0 0 1 8. 7 0 0 0 0 0 16 ENE 0 0 0 0 0 2 3 0 0 0 0 0 5 E 0 0 0 0 1 4 3 0 0 0 0 0 8 ESE 0 0 0 0 1 5 12 1 2 0 0 0 21 SE 0 0 0 0 0 5 10 0 0 0 0 0 15 SSE 0 0 0 0 0 0 10 1 0 0 0 0 11 S 0 0 0 0 0 3 7 0 0 0 0 0 10 SSW 0 00 0 0 0 0 2 0 0 0 0 0 2 SW 0 0 0 0 0 0 0 1 0 0 0 0 1 WSW 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 WNW 0 0 0 0 0 2 0 0 0 0 0 2 0

NW 0 0 0 0 0 2 0 0 0 0 0 2 0 0 NNW 0 0 0 0 , 3 0 0 0 0 0 3 TOTAL 0 0 0 0 3 30 84 10 2 0 0 0 129 NUMBER OF CALMS: 0 NUMBER OF INVALID HOURS: 0 NUMBER OF VALIDeHOURS: 129 TOTAL HOURS FOR THE PERIOD: 129 STABILITY CLASS C FROM 10/ 1/07 0:00 TO 12/31/07 23:00 PRIMARY SENSORS - 150 FOOT WIND SPEED (METERS/SECOND)

WIND .22- .51- .76- 1.1- 1.6- 2.1- 3.1- 5.1- 7.1- 10.1- 13.1- >18 TOT.

DIR .50 .75 1.0 1.5 2.0 3.0 5.0 7.0 10.0 13.0 18.0 N 0 0 0 0 0 1 4 3 0 0 0 0 8 NNE 0 0 0 0 0 4 4 1 0 0 0 0 9 NE 0 0 0 0 0 4 3 1 0 0 0 0 8 ENE 0 0 0 0 0 2 4 0 0 0 0 0 6 E 0 0 0 0 1 2 0 0 0 0 0 0 3 ESE 0 0 0 0 0 1 4 0 0 0 0 0 5 SE 0 0 0 0 0 0 1 2 0 0 0 0 3 SSE 0 0 0 0 0 1 0 0 0 0 0 0 1 S 0 0 0 0 0 1 5 0 0 0 0 0 6 SSW 0 0 0 0 0 2 2 2 0 0 0 0 6 SW 0 0 0 0 0 1 2 1 0 0 0 0 4 WSW 0 0 0 0 0 2 2 0 0 0 0 0 4 W 0 0 0 0 0 2 0 0 0 0 0 0 2 WNW 0 0 0 1 0 0 0 0 0 0 0 0 1 NW 0 0 0 0 0 1 2 2 0 0 0 0 5 NNW 0 0 0 0 0 1 2 1 0 0 0 0 4 TOTAL 0 0 0 1 1 25 35 13 0 0 0 0 75 NUMBER OF CALMS: 0 NUMBER OF INVALID HOURS: 0 NUMBER OF VALID HOURS: 75 TOTAL HOURS FOR THE PERIOD: 75 62

River Bend Station 2007 Regulatory Guide 1.21 4/15/2007 RIVER BEND STATION JOINT FREQUENCY TABLE STABILITY CLASS D FROM 10/ 1/07 0:00 TO 12/31/07 23:00 PRIMARY SENSORS - 150 FOOT WIND SPEED (METERS/SECOND)

WIND .22- .51- .76- 1.1- 1.6- 2.1- 3.1- 5.1- 7.1- 10.1- 13.1- >18 TOT.

DIR .50 .75 1.0 1.5 2.0 3.0 5.0 7.0 10.0 13.0 18.0 N 0 0 0 2 7 18 25 10 0 0 0 0 62 NNE 0 0 0 0 5 18 14 2 0 0 0 0 39 NE 0 0 0 2 6 12 24 0 0 0 0 0 44 ENE 0 0 0 1 4 3 16 5 0 0 0 0 29 E 0 0 0 1 3 5 5 2 0 0 0 0 16 ESE 0 0 0 1 4 8 40 8 0 0 0 0 61 SE 0 0 1 0 1 8 29 8 0 0 0 0 47 SSE 0 0 0 3 2 5 24 5 1 0 0 0 40 S 0 0 0 0 0 11 17 0 0 0 0 0 28 SSW 0 0 0 1 3 6 5 3 0 0 0 0 18 SW 0 0 0 0 4 4 6 1 0 0 0 0 15 WSW 0 0 1 0 4 12 5 1 0 0 0 0 23 W 0 0 0 1 4 13 14 1 0 0 0 0 33 WNW 0 0 0 1 0 1 22 17 1 0 0 0 42 NW 0 0 0 0 3 4 19 12 5 0 0 0 43 NNW 0 0 0 0 1 15 27 6 0 0 0 0 49 TOTAL 0 0 2 13 51 143 292 81 7 0 0 0 589 NUMBER OF CALMS: 0 NUMBER OF INVALID HOURS: 0 NUMBER OF VALID HOURS: 589 TOTAL HOURS FOR THE PERIOD: 589 STABILITY CLASS E FROM 10/ 1/07 0:00 TO 12/31/07 23:00 PRIMARY SENSORS - 150 FOOT WIND SPEED (METERS/SECOND)

WIND .22- .51- .76- 1.1- 1.6- 2.1- 3.1- 5.1- 7.1- 10.1- 13.1- >18 TOT.

DIR .50 .75 1.0 1.5 2.0 3.0 5.0 7.0 10.0 13.0 18.0 N 1 6 7 5 7 17 45 3 0 0 0 0 91 NNE 0 0 0 1 2 22 53 1 0 0 0 0 79 NE 0 0 0 2 5 12 39 6 0 0 0 0 64 ENE 0 0 0 0 1 13 14 7 0 0' 0 0 35 E 0 0 0 2 3 9 17 8 3 0 0 0 42 ESE 0 0 0 0 1 11 118 24 1 0 0 0 155 SE 0 0 0 0 4 13 69 3 0 0 0 0 89 SSE 0 0 0 0 4 12 31 2 0 0 0 0 49 S 0 0 0 1 1 19 14 0 0 0 0 0 35 SSW 0 0 0 0 3 14 13 0 0 0 0 0 30 Sw 0 0 0 3 0 2 8 0 0 0 0 0 13 WSW 0 0 0 2 1 2 2 0 0 0 0 0 7 W 0 0 0 0 0 6 4 1 0 0 0 0 11 WNW 0 0 0 0 0 4 7 3 1 0 0 0 15 NW 0 1 0 0 2 3 7 2 0 0 0 0 15 NNW 0 0 0 0 1 4 8 2 0 0 0 0 15 TOTAL 1 7 7 16 35 163 449 62 5 0 0 0 745 NUMBER OF CALMS: 0 NUMBER OF INVALID HOURS: 0 NUMBER OF VALID HOURS: 745 TOTAL HOURS FOR THE PERIOD: 745 63

River Bend Station 2007 Regulatory Guide 1.21 4/15/2007 RIVER BEND STATION JOINT FREQUENCY TABLE STABILITY CLASS F FROM 10/ 1/07 0:00 TO 12/31/07 23:00 PRIMARY SENSORS - 150 FOOT WIND SPEED (METERS/SECOND)

WIND .22- .51- .76- 1.1- 1.6- 2.1- 3.1- 5.1- 7.1- 10.1- 13.1- >18 TOT.

DIR .50 .75 1.0 1.5 2.0 3.0 5.0 7.0 10.0 13.0 18.0 N 0 0 0 1 0 4 8 0 0 0 0 0 13 NNE 0 0 0 0 0 10 28 0 0 0 0 0 38 NE 0 0 0 0 0 5 28 0 0 0 0 0 33 ENE 1 0 0 1 1 9 20 0 0 0 0 0 32 E 0, 0 0 1 1 7 6 1 0 0 0 0 16 ESE 0 0 0 1 1 11 27 1 0 0 0 0 41 SE 0 0 0 .2 3 5 14 0 0 0 0 0 24 SSE 0 0 0 1 1 1 2 0 0 0 0 0 5 S 0 0 0 2 1 4 2 0 0 0 0 0 9 SSW 0 0 0 0 0 3 1 0 0 0 0 0 4 SW 0 0 0 0 0 1 1 0 0' 0 0 0 2 WSW 0 0 0 1 0 1 0 0 0 0 0 0 2 W 0 0 0 0 1 1 0 0 0 0 0 0 2 WNW 0 0 0 0 1 1 0 0 0 0 0 0 2

,/NW 0 0 0 0 1 0 0 0 0 0 0 0 1 NNW 0 0 0 0 0 2 5 0 0 0 0 0 7 TOTAL 1 0 0 10 11 65 142 2 0 0 0 0 231 NUMBER OF CALMS: 0 NUMBER OF INVALID HOURS: 0 NUMBER OF VALID HOURS: 231 TOTAL HOURS FOR THE PERIOD: 231 STABILITY CLASS G FROM 10/ 1/07 0:00 TO 12/31/07 23:00 PRIMARY SENSORS - 150 FOOT WIND SPEED (METERS/SECOND)

WIND .22- .51- .76- 1.1- 1.6- 2.1- 3.1- 5.1- 7.1- 10.1- 13.1- >18 TOT.

DIR .50 .75 1.0 1.5 2.0 3.0 5.0 7.0 10.0 13.0 18.0 N 0 0 1 2 7 18 15 0 0 0 0 0 43 NNE 0 0 1 2 1 12 15 0 0 0 0 0 31 NE 0 0 0 0 1 7 19 0 0 0 0 0 27 ENE 0 0 0 1 3 14 8 0 0 0 0 0 26 E 0 0 1 0 4 11 7 1. 0 0; 0 0 24 ESE 0 0 0 0 2 8 14 0 0 0 0 0 24 SE 0 0 '0 0 1 9 11 0 .0 0 0 0 21 SSE 0 0 0 0 2 7 2 0 0 0 0 0 11 S 0 0 0 0 3 10 0 0 0 0 0 0 13 SSW 0 0 0 1 5 10 1 0 0 0 0 0 17 SW 0 0 0 0 3 7 1 0 0 0 0 0 11 WSW 0 0 0 2 1 3 0 0 0 0 0 0 6 W 0 2 0 1 1 3 0 0 0 0 0 0 7 WNW 0 0 1 0 3 2 1 0 0 0 0 0 7 NW 0 0 0 0 1 4 4 0 0 0 0 0 9 NNW 0 0 0 0 1 2 6 0 0 0 0 0 9 TOTAL 0 2 4 9 39 127 104 1 0 0 0 0 286 NUMBER OF CALMS: 0 NUMBER OF INVALID HOURS: 0 NUMBER OF VALID HOURS: 286 TOTAL HOURS FOR THE PERIOD: 286 64

River Bend Station 2007 Regulatory Guide 1.21 4/15/2007 Table 7 Effluent and Waste Disposal Annual Report 2007 .Year ATMOSPHERIC DISPERSION AND DEPOSITION RATES FOR THE MAXIMUM INDIVIDUAL DOSE CALCULATIONS Analysis Location Ground Level Mixed Mode (meters) Releases Releases Gamma air dose (3) and 994 m WNW (Containment) CHI/Q - 421.0 CHI/Q - 33.1 Beta Air Dose Maximum Receptor (4) 994 m WNW CHI/Q - 421.0 CHI/Q - 33.1 Resident D/Q - 50.3 D/Q - 18.0 Garden Meat animal Immersion Milk animal (5) 7,000 m WNW CHI/Q - 3.58 CHI/Q - .870 D/Q - 0.38 D/Q - .223 Other on-site Receptors 115 m ENE CHI/Q - 5977.0 CHI/Q - 407.5 D/Q - 529.7 D/Q - 46.9 275 m N CHI/Q - 1644.0 CHI/Q 169.1 D/Q - 345.6 D/Q 68.4 2500 SW CHI/Q - 34.45 CHI/Q - 4.65 I D/Q - 3.35 D/Q 1.40 Notes: " 7 3 (1) All CHI/Q = 10- sec/m 2

(2) All D/Q = 10-9 m-(3) Maximum offsite location (property boundary) with highest CHI/Q (unoccupied).

(4) Maximum hypothetical occupied offsite location with highest CHI/Q and D/Q.

(5) No milk animal within 5 miles radius, hypothetical location in worst sector.

65

River Bend Station 2004 Regulatory Guide 1.21 April 15,2007 Table 8 GROUND MONITORING WELL SAMPLES (H-3) - RBS LLD (pCi/I) 3000 LAB ID LOCATION DATE TRITIUM 20070960 MW-05 9/19/2007 < 529 20070962 MW-08 9/19/2007 < 531 20070963 EB Blank 1 9/20/2007 < 529 20070964 EB Blank 2 9/20/2007 <.532 20070967 MW-10 9/20/2007 < 527 20070968 MW-10 DUP 9/20/2007 < 528 20070976 MW-04 9/20/2007 < 524 20070978 MW-02 9/20/2007 < 524 20071294 MW-08 12/5/2007 < 570 20071295 MW-05 12/5/2007 < 566 20071296 MW.-05D 12/5/2007 < 574 20071297 MW-02 12/5/2007 < 587 20071298 MW-04 12/5/2007 < 586 20071299 MW-10 12/5/2007 < 590 66

River Bend Station 2004 Regulatory Guide 1.21 April 15,2007 Table 8 (Continued)

GROUND MONITORING WELL SAMPLES (H-3) - RBS (Continued)

LLD (pCi/I) 3000 LAB ID LOCATION DATE TRITIUM 20071300 EB-1 12/5/2007 < 588 MW - Monitoring Well EB - Equipment Blank D - Duplicate DUP - Duplicate 67

River Bend Station 2004 Regulatory Guide 1.21 April 15,2007 Table 8 (Continued)

GROUND MONITORING WELL SAMPLES (GAMMA) - RBS LLD (pCi/I) 15 15 30 15 30 15 30 15 15 18 60 15 LAB ID LOCATION DATE MN-54 C0-58 FE-59 CO-60 ZN-65 NB-95 ZR-95 1-131 CS-134 CS-137 BA-140 LA-140 20070959 MW-05 9/19/2007 < 9.24 < 9.36 < 20.83 < 9.44 < 23.58 12.72 < 15.66 < 10.83 < 8.81 < 9.78 < 38.05 < 12.97 20070961 MW-08 9/19/2007 < 9.63 < 10.09 < 21.61 < 7.52 < 14.89 10.17 < 13.86 < 8.04 < 10.93 < 8.83 < 26.51 < 7.23 20070963 EB Blank I 9/20/2007 < 7.13

• 5.21 < 15.84 < 4.91 < 20.47 7.38 < 11.83 < 9.89 < 8.12 < 8.45 < 29.33 < 7.06 20070964 EB Blank 2 9/20/2007 < 8.40 < 8.02 < 16.44 < 9.72 < 18.89 7.23 < 12.60 < 10.01 < 7.62 < 6.13 < 35.26 < 6.13 20070965 MW-10 9/20/2007 < 12.97 < 11.56 < 19.95 < 12.54 < 21.77 13.17 < 14.09 < 10.49 < '14.07 < 12.75 < 38.41 < 14.43 20070966 MW-10 DUP 9/20/2007 < 8.70 < 9.37 < 17.94 < 10.15 < 26.44 12.41 < 18.13 < 10.38 < 10.54 < 10.17 < 36.63 < 14.02 20070975 MW-04 9/20/2007 < 12.09 < 9.81 < 14.22 < 10.30. < 25.58 8.25 < 13.95 <*A1.29 < 10.60 < 10.33 < 28.15 < 13.57 20070977 MW-02 9/20/2007 < 11.81 < 9.92 < 25.59 < 10.34 < 26.25 12.55 < 20.14 < 11.30 < 14.94 < 12.86 < 43.23 < 14.28 20071294 MW-08 12/5/2007 < 10.13 < 8.60 < 18.88 < 9.20 < 18.08 9.80 < 12.99 < 9.08 < 10.77 < 11.12 < 37.91 < 14.66 20071295 MW-05 12/5/2007 < 14.76 < 5.97 < 19.82 < 13.82 < 19.76 12.18

• 19.37 < 11.45 < 11.41 < 11.95 < 39.78 < 14.95 20071296 MW-05D 12/5/2007 < 9.86 < 6.74 < 15.09 < 8.41 < 19.64 11.26 < 16.14 < 9.67 9.65 < 8.06 < 28.35 < 12.65 20071297 MW-02 12/5/2007 < 11.78 < 11.74 < 20.27 < 12.84 < 23.33 13.30 < 17.28 < 11.56 < 10.58 < 8.93 < 36.86 < 12.55 68

River Bend Station 2004 Regulatory Guide 1.21 April 15,2007 Table 8 (Continued)

GROUND MONITORING WELL SAMPLES (GAMMA) - RBS (Continued) 20071298 MW-04 12/5/2007 < 9.08 < 9.09 < 18.89 < 11.80 < 19.67 < 12.54 < 19.97 < 13.30 < 13.02 < 8.31 < 30.42 < 12.79 20071299 MW-10 12/5/2007 < 8.29 < 8.23 < 16.05 < 6.69 < 16.36 < 12.42 < 17.91 < 6.85 < 10.76 < 9.87 < 31.06 < 9.21 20071300 EB-1 12/5/2007 < 8.49 < 11.75 < 24.20 < 9.86 < 21.42 < 12.75 < 9.09 < 12.82 < 11.83 < 13.17 < 37.42 < 7.08 MW - Monitoring Well EB - Equipment Blank D - Duplicate DUP - Duplicate 69