ML091280431

Annual Radioactive Effluent Release Report

ML091280431
Person / Time
Site:	Limerick
Issue date:	12/31/2008
From:	Exelon Nuclear
To:	Office of Nuclear Reactor Regulation
References
Download: ML091280431 (103)

Text

Nuclear Annual Radioactive Effluent Release Report No. 34 2008 Limerick Generating Station

SITE: LIMERICK GENERATING STATION - UNITS 1 & 2 LICENSEE: EXELON GENERATION COMPANY, LLC ANNUAL RADIOACTIVE EFFLUENT RELEASE REPORT NO. 34 January 1, 2008 Through December 31, 2008 EXELON GENERATION COMPANY, LLC LIMERICK GENERATING STATION UNITS NO. 1 AND 2 DOCKET NO. 50-352 (Unit 1)

DOCKET NO. 50-353 (Unit 2)

Submitted to The United States Nuclear Regulatory Commission Pursuant to Facility Operating License:

NPF-39 (Unit 1)

NPF-85 (Unit 2)

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SITE: LIMERICK GENERATING STATION - UNITS 1 & 2 LICENSEE: EXELON GENERATION COMPANY, LLC TABLE OF CONTENTS SECTION PAGE

1. Introduction 1

2. Supplemental Information 1 A Regulatory Limits 1 B Effluent Concentration Limits 2 C Average Energy 2 D Measurements and Approximations of Total Radioactivity 2 E Batch Releases 4 F Abnormal Releases 4 G Revisions to the ODCM 4 H Radioactive Effluent Monitoring Instrumentation Out of Service for More Than 30 Days 4 I Independent Spent Fuel Storage Installation (ISFSI) 5 J Compliance to 40 CFR Part 190 Limits 5 Appendix A - Effluent and Waste Disposal Summary 7 Appendix B - Solid Waste and Irradiated Fuel Shipments 21 Appendix C - Radiological Impact to Man 27 Appendix D - Meteorological Data 31 Page i

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SITE: LIMERICK GENERATING STATION - UNITS 1 & 2 LICENSEE: EXELON GENERATION COMPANY, LLC

1. Introduction In accordance with the reporting requirements of Technical Specification 6.9.1.8 applicable during the reporting period, this report summarizes the effluent release data for Limerick Generating Station Units 1 and 2 for the period January 1, 2008 through December 31, 2008. This submittal complies with the format described in Regulatory Guide 1.21, "Measuring, Evaluating and Reporting Radioactivity in Solid Wastes and Releases of Radioactive Materials in Liquid and Gaseous Effluents from Light-Water Cooled Nuclear Power Plants", Revision 1, June, 1974.

Meteorological data was reported in the format specified in Regulatory Guide 1.23, Revision 1, "Meteorological Monitoring Programs For Nuclear Power Plants".

All vendor results were received and included in the report calculations. Therefore the 2008 report is complete.

2. Supplemental Information A. Regulatory Limits Limit Units Receptor ODCM and 10 CFR 50, Appendix .[

Design Objective Limits

1. Noble Gases:

a. < 500 mrem/Yr Total Body ODCM Control 3.2.2.1 .a

<3000 mrem/Yr Skin

b. <10 mRad Air Gamma Quarterly air dose limits

<20 mRad Air Beta ODCM Control 3.2.2.2.a

c. < 20 mRad Air Gamma Yearly airdose limits

< 40 mRad Air Beta ODCM Control 3.2.2.2.b

d. <10 mrem Total Body (Gamma) 10 CFR 50, Appendix I, Section

< 30 mrem Skin (Beta) II.B.2(b)

2. lodines, Tritium, Particulates with Half Life > 8 days:

a. < 1500 mrem/Yr Any Organ ODCM Control 3.2.2.1 .b

b. <15 mrem Any Organ Quarterly dose limits ODCM Control 3.2.2.3.a

c. < 30 mrem Any Organ Yearly dose limits ODCM Control 3.2.2.3.b

3. Liquid Effluents

a. Concentration 10 CFR 20, Appendix B, Table 2 ODCM Control 3.2.1.1 Col. 2

b. <3 mrem Total Body Quarterly dose limits

<10 mrem Any Organ ODCM Control 3.2.1.2.a

c. <6 mrem Total Body Yearly dose limits

-<20 mrem Any Organ ODCM Control 3.2.1.2.b

4. 40CFR 190

-<25 mrem Total Body or Organ Yearly dose limits

< 75 mrem Thyroid ODCM Control 3.2.3 Page 1

SITE: LIMERICK GENERATING STATION - UNITS 1 & 2 LICENSEE: EXELON GENERATION COMPANY, LLC B. Effluent Concentration Limits:

Gaseous dose rates rather than effluent concentrations are used to calculate permissible release rates for gaseous releases. The maximum permissible dose rates for gaseous releases are defined in ODCM Controls 3.2.2.2.a and 3.2.2.2.b.

The Effluent Concentration Limit (ECL) specified in 10 CFR 20, Appendix B, Table 2, Column 2 for identified nuclides, were used to calculate permissible release rates and concentrations for liquid release per the Limerick Offsite Dose Calculation Manual Control 3.2.1.1. The total activity concentration for all dissolved or entrained gases was limited to < 2E-04 gCi/ml.

C. Average Energy ( E):

The Limerick ODCM limits the instantaneous dose equivalent rates due to the release of noble gases to less than or equal to 500 mrem/year to the total body and less than or equal to 3000 mrem/year to the skin. The average beta and gamma energies (T) of the radionuclide mixture in-releases of fission and activation gases as described in Regulatory Guide 1.21, "Measuring, Evaluation, and Reporting Radioactivity in Solid Wastes and Releases of Radioactive Materials in Liquid and Gaseous Effluents from Light-Water-Cooled Nuclear Power Plants," maybe used to calculate doses in lieu of more sophisticated software. The Limerick radioactive effluent program employs the methodologies presented in U.S. NRC Regulatory Guide 1.109 "Calculation of Annual Doses to Man from Routine Releases of Reactor Effluents for the Purpose of Evaluating Compliance with 10 CFR Part 50, Appendix I,"

Revision 1, October 1977 and NUREG-0133, "Preparation of Radiological Effluent Technical Specifications for Nuclear Power Plants, October 1978. Therefore, average energies are not applicable to Limerick.

D. Measurements and Approximations of Total Radioactivity:

1. Fission and Activation Gases The method used for Gamma Isotopic Analysis is the Canberra Gamma Spectroscopy System with a gas Marinelli beaker. Airborne effluent gaseous activity was continuously monitored and recorded in accordance with ODCM Table 4.2-2. Additional vent grab samples were taken from the North Stack, Unit 1 South Stack and Unit 2 South Stack and analyzed at least monthly to determine the isotopic mixture of noble gas activity released for the month. The data from the noble gas radiation monitor were analyzed to report net noble gas effluent activity. When no activity was found in the grab isotopic analysis, the isotopic mixture was assumed to be that evaluated in the UFSAR (Section 11.5, Table 11.5-4). If activity was found in the grab isotopic analysis, the isotopic mixture for the Noble Gas Monitor was determined from that isotopic mixture.

Each month a monitor background was determined at the time of the noble gas grab sample and used to determine net radiation monitor activity. When no isotopic activity was identified in the grab noble gas sample, the noble gas radiation monitor 15-minute average data for one-hour prior to and one-hour post noble gas grab sampling were used to determine monitor background for the month. The mean plus two standard deviations was used as background for each Noble Gas Monitor. When activity was identified the background determination was made from the last month that no activity was found.

2. Particulates and lodines The method used for Gamma Isotopic Analysis is the Canberra Gamma Spectroscopy System with a particulate filter (47 mm) or charcoal cartridge, respectively. Particulate and iodine activity was continuously sampled and analyzed in accordance with ODCM Table 4.2-2. Charcoal and particulate samples are taken from the North Stack, Unit 1 South Stack, Unit 2 South Stack and the Hot Maintenance Shop exhausts and analyzed Page 2

SITE: LIMERICK GENERATING STATION - UNITS 1 & 2 LICENSEE: EXELON GENERATION COMPANY, LLC at least weekly to determine the total activity released from the plant based on the highest vent flow rates recorded for the sampling period.

3. Liquid Effluents Each batch of liquid effluent was sampled and analyzed for gamma isotopic activity in accordance with ODCM Table 4.2-1 prior to release. The total activity of each released batch was determined by multiplying each nuclide's concentration by the total volume discharged and then summing. The total activity released during a month was then determined by summing the activity content of all batch releases discharged during the month.

4. Tritium in Liquid and Gaseous Effluents:

Tritium in Liquid Effluents is analyzed using a Liquid Scintillation Counter.

Air from stack effluents was passed through two bubblers in series and an aliquot of the water from each bubbler was analyzed using a Liquid Scintillation Counter.

5. Composite Samples and Lower Limit of Detection (LLD)

Particulate air samples were composited quarterly and analyzed for gross alpha, Sr-89 and Sr-90. Liquid radwaste samples were composited monthly and quarterly and analyzed for gross alpha (monthly) and Fe-55, Sr-89 and Sr-90 (quarterly). These composites were submitted to an offsite vendor laboratory for analysis. The ODCM required lower limit of detection for airborne and liquid releases are as follows:

Airborne: LLD Gross Alpha 1E-11 uCi/cc Sr-89, Sr-90 1 E-11 uCi/cc 1-131 1E-12 uCi/cc 1-133 1E-10 uCi/cc Principal Gamma Emitters (Mn-54, Fe-59, Co-58, Co-60, Zn-65, Mo-99, 1-131, Cs-134, 1E-11 uCi/cc Cs-137,Ce-141, Ce-144)

Noble Gas (Kr-87, Kr-88,.Xe-133, Xe-133m, 1E-04'uCi/cc Xe-135, Xe-135m, Xe-138)

H-3 1 E-06 uCi/cc Liquid:

Principal Gamma Emitters (Mn-54, Fe-59, Co-58, Co-60, Zn-65, Mo-99, Cs-1 34, Cs-1 37, 5E-07 uCi/mI Ce-141, Ce-144) 1-131 1E-06 uCi/mI Entrained Gases (Kr-87, Kr-88, Xe-133, 1E-05 uCi/mI Xe-133m, Xe-135, Xe-135m, Xe-138)

H-3 1E-05 uCi/mI Gross Alpha 1E-07 uCi/mI Sr-89, Sr-90 5E-08 uCi/mI Fe-55 1E-06 uCi/mI

6. Estimated Total Error Present Procedure CY-AA-1 70-2100, Estimated Errors of Effluent Measurements, provides the methodology to obtain an overall estimate of the error associated with radioactive effluents.

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SITE: LIMERICK GENERATING STATION - UNITS 1 & 2 LICENSEE: EXELON GENERATION COMPANY, LLC E. Batch Releases:

1. Liquid Qtr 1 Qtr 2 Qtr 3 Qtr 4 Number of Batch Releases 8.80E+01 4.70E+01 4.40E+01 3.70E+01 Total time period for batch releases (min) 7.73E+03 3.60E+03 4.02E+03 3.33E+03 Maximum time period for batch release (min) 1.16E+02 1.08E+02 1.31 E+02 1.03E+02 Average time period for batch release (min) 8.78E+01 7.65E+01 9.13E+01 8.99E+01 Minimum time period for batch release (min) 5.36E+01 2.37E+01 3.24E+01 5.04E+01 Average stream flow (Schuylkill River) during periods of release of effluents into a flowing 2.08E+06 7.26E+05 3.16E+05 1.10E+06 stream (gpm)

2. Gaseous Oil Incineration Qtr 1 Qtr 2 Qtr 3 Qtr 4 Number of Batch Releases 0' 0 0 0 Total time period for batch releases (min) 0 0 0 0 Maximum time period for batch release (min) 0 0 0 0 Average time period for batch release (min) 0 0 0 0 Minimum time period for batch.release (min) 0 0 0 0 Other Batch Releases Qtr 1 Qtr 2 Qtr 3 Qtr 4 Number of Batch Releases 6.00E+0c 2.OOE+00 0 0 Total time period for batch releases (min) 1.27E+04 3.72E+03 0 0 Maximum time period for batch release (min) 2.50E+01 2.22E+03 0 0 Average time period for batch release (min) 2.12E+03 1.86E+03 0 0 Minimum time period for batch release (min) 9.00E+011 1.50E+03 0 0 F. Abnormal Releases:

1. Liquid 1 Qtr 2 Qtr 3 Qtr 4 Number of Releases 0 2 0 0 Total Activity Released (Ci) 0 8.36E-05 0 0

2. Gaseous Number of Releases 6 2 0 0 Total Activity Released (Ci) 2.1 E-05 1.82E-06 0 0 G. Revisions to the ODCM Revision 24 of CY-LG-170-301, Offsite Dose Calculation Manual was approved on July 21, 2008. A complete copy is included in the mailing.

H. Radioactive Effluent Monitoring Instrumentation Out of Service for More Than 30 Days Per ODCM Control 3.1.1, "Radioactive Liquid Effluent Monitoring Instrumentation" and Control 3.1.2 "Radioactive Gaseous Effluent Monitoring Instrumentation", instrumentation requires:

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SITE: LIMERICK GENERATING STATION - UNITS 1 & 2 LICENSEE: EXELON GENERATION COMPANY, LLC With less than the minimum number of radioactive gaseous effluent monitoring instrumentation channels OPERABLE, take the ACTION shown in Table 3.1-1 (liquids) or and Table 3.1-2 (gas). Restore the inoperable instrumentation to OPERABLE status within the time specified in the ACTION or explain in the next Annual Radioactive Effluent, Release Report why this inoperability was not corrected within the time specified. The following is a discussion of instrumentation out of service for greater than 30 days:

Per IR 789169, the Liquid Radwaste effluent line flow monitor was declared inoperable on June 22, 2008 and remained inoperable through the end of 2008. Release flows were conservatively reduced to ensure that release flows did not exceed the ODCM limit of 255 gallons per minute.

The effluent line flow monitor was not repaired in the 30-day time frame was due to the complex troubleshooting that was required to determine the cause of the suspect flow readings. The flow orifice was eventually replaced, which required an engineering change request to evaluate the replacement. However, this did not eliminate the issue.

Troubleshooting is continuing.

Independent Spent Fuel Storage Installation (ISFSI)

An Independent Spent Fuel Storage Installation (ISFSI) was placed in service starting July 21, 2008. In 2008 a total of two canisters were placed in long-term storage. The dose to offsite individuals was non detectable.

J. Compliance to 40 CFR 190 Limits The radioactive material released during this reporting period and the doses listed in this report were within the limits of the ODCM and 40 CFR 190. A detailed analysis of doses to Members of the Public is presented in Appendix C, Radiological Impact to Man.

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SITE: LIMERICK GENERATING STATION - UNITS 1 & 2 LICENSEE: EXELON GENERATION COMPANY, LLC Appendix A Effluent and Waste Disposal Summary Page 7

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SITE: LIMERICK GENERATING STATION - UNITS 1 & 2 LICENSEE: EXELON GENERATION COMPANY, LLC LIST OF TABLES PAGE Table A - 1 Gaseous Effluents - Summation of All Releases 11 Table A - 2 Gaseous Effluents for Release Point - North Stack 12 Table A - 3 Gaseous Effluents for Release Point - Unit 1 South Stack 13 Table A - 4 Gaseous Effluents for Release Point - Unit 2 South Stack 14 Table A - 5 Gaseous Effluents for Release Point - Hot Maintenance Shop 15 Table A - 6 Gaseous Effluents for Release Point - Oil Incineration 16 Table A - 7 Gaseous Effluents for Release Point - Other Batch Releases 17 Table A - 8 Liquid Effluents - Summation.of All Releases 18 Table A - 9 Liquid Effluents for Release Point - Liquid Radwaste 19 Page 9

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SITE: LIMERICK GENERATING STATION - UNITS 1 & 2 LICENSEE: EXELON GENERATION COMPANY, LLC TABLE A -1 GASEOUS EFFLUENTS - SUMMATION OF ALL RELEASES PERIOD 2008 A. FISSION AND ACTIVATION GASSES Units Qtr [ Qtr 2 Qtr 3 Qtr4 Est. Total Error %

1. Total Release Ci 9.65E+00 5.57E+01 6.06E+00 1.94E+00 3.66E+01

2. Averaae Release Rate for Period uCi/sec 1.23E+00 7.08E+00 7.16E-01 2.47E-01

3. Dose- GammaAirDose mrad 1.78E-02 5.50E-02 8.25E-03 2.13E-03

- Beta Air Dose mrad 1.04E-02 3.42E-02 4.93E-03 1.31 E-03

4. Percent of ODCM Limit  % 1.78E-01 5.50E-01 8.25E-02 2.13E-02

- Gamma Air Dose

- Beta Air Dose  % 5.20E-02 1.71 E-01 2.47E-02 6.55E-03 B. IODINES C. PARTICULATES Units Qtr 1 Qtr 2 Qtr 3 Qtr4 Est. Total Error %

1. Particulates with T 1/2 > 8 days Ci 8.24E-05 1.92E-06 < LLD < LLD 2.26E+01

2. Average Release Rate for Period uCi/sec 1.05E-05 2.44E-07 < LLD < LLD

3. Percent of ODCM Limit  %* * * *

4. Gross Alpha Radioactivity Ci < LLD < LLD < LLD < LLD D. TRITIUM Units Qtr 1 Qtr 2 Qtr 3 Qtr 4 Est. Total Error %

1. Total Release Ci 1.28E+00 3.73E-01 1.04E+01 9.52E+00 1.57E+01

2. Averacae Release Rate for Period I uCi/sec 1.63E-01 4.75E-02 1.23E+00 1.21 E+00

13. Percent of ODCM Limit  % * * *

• E. Iodine 131 & 133, Tritium & Particulate Units Qtr 1 Qtr 2 Qtr 3 Qtr 4 1i. Organ Dose mrem 3.81E-03 9.OOE-04 2.46E-02 2.26E-02

2. Percent of ODCM Limit  % 2.54E-02 6.OOE-03 1.64E-01 1.51 E-01

• ODCM Limit for combined Iodine, tritium and particulate only, which is shown in Item E.

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SITE: LIMERICK GENERATING STATION - UNITS 1 & 2 LICENSEE: EXELON GENERATION COMPANY, LLC TABLE A - 2 GASEOUS EFFLUENTS FOR RELEASE POINT - NORTH STACK PERIOD 2008

1. FISSION AND ACTIVATION GASSES Nuclide Released Continuous Mode Units Qtr 1 Qtr 2 Qtr 3 Qtr 4 AR-41 Ci < LLD < LLD < LLD < LLD KR-85 Ci 6.29E-01 3.14E-03 1.71E-01 1.62E-02 KR-85M Ci 1.67E-01 8.31 E-04 4.53E-02 4.29E-03 KR-87 Ci 2.92E-01 1.46E-03 7.94E-02 7.53E-03 KR-88 Ci 5.16E-01 2.58E-03 1.40E-01 1.33E-02 XE-131M Ci 1.58E-02 7.86E-05 4.28E-03 4.06E-04 XE-133 Ci 5.87E-02 2.93E-04 1.60E-02 1.51E-03 XE-1 33M Ci <LLD < LLD < LLD < LLD XE-135 Ci 2.30E+00 1.15E-02 6.25E-01 5.93E-02 XE-135M Ci 1.47E+00 7.31 E-03 3.98E-01 3.78E-02 XE-138 Ci 3.14E+00 1.57E-02 8.54E-01 8.1OE-02 Total for Period Ci 8.58E+00 4.28E-02 2.33E+00 2.21 E-01

2. IODINES Nuclide Released Continuous Mode Units Qtr 1 Qtr 2 Qtr 3 Qtr 4 1-131 Ci < LLD < LLD < LLD <LLD 1-133 Ci < LLD < LLD < LLD < LLD 1-135 Ci < LLD < LLD < LLD < LLD Total for Period Ci < LLD < LLD < LLD < LLD

3. PARTICULATES (T 1/2 > 8 DAYS)

Nuclide Released Continuous Mode Units Qtr 1 Qtr 2 Qtr 3 Qtr 4 CR-51 Ci < LLD < LLD < LLD < LLD MN-54 Ci < LLD < LLD < LLD < LLD CO-58 Ci < LLD < LLD < LLD < LLD CO-60 Ci < LLD < LLD < LLD < LLD SR-89 Ci < LLD < LLD < LLD < LLD SR-90 Ci < LLD < LLD < LLD < LLD MO-99 Ci < LLD < LLD < LLD < LLD AG-110M Ci < LLD < LLD < LLD < LLD CS-134 Ci < LLD < LLD < LLD < LLD CS-137 Ci < LLD < LLD < LLD < LLD BA-140 Ci < LLD < LLD < LLD < LLD LA-140 Ci < LLD < LLD < LLD < LLD CE-141 Ci < LLD < LLD < LLD < LLD CE-144 Ci < LLD < LLD < LLD < LLD Total for Period Ci < LLD < LLD < LLD < LLD Page 12

SITE: LIMERICK GENERATING STATION - UNITS 1 & 2 LICENSEE: EXELON GENERATION COMPANY, LLC TABLE A - 3 GASEOUS EFFLUENTS FOR RELEASE POINT - UNIT 1 SOUTH STACK PERIOD 2008

1. FISSION AND ACTIVATION GASSES Nuclide Released Continuous Mode Units Qtr 1 Qtr 2 Qtr 3 Qtr 4 AR-41 Ci 6.47E-02 3.97E+00 2.66E-01 3.27E-02 KR-85 Ci < LLD < LLD < LLD < LLD KR-85M Ci 1.55E-02 9.51 E-01 6.38E-02 7.84E-03 KR-87 Ci 1.55E-02 9.51E-01 6.38E-02 7.84E-03 KR-88 Ci 1.55E-02 9.51 E-01 6.38E-02 7.84E-03 XE-133 Ci 3.36E-01 2.06E+01 1.38E+00 1.70E-01 XE-133M Ci < LLD < LLD < LLD < LLD XE-135 Ci 1.76E-01 1.08E+01 7.23E-01 8.89E-02 XE-135M Ci 2.38E-01 1.46E+01 9.79E-01 1.20E-01 XE-138 Ci 3.62E-02 2.22E+00 1.49E-01 1.83E-02 Total for Period Ci 8.97E-01 5.50E+01 3.69E+00 4.54E-01

2. IODINES Nuclide Released Continuous Mode Units Qtr 1 Qtr 2 Qtr 3 Qtr 4 1-131 Ci < LLD < LLD < LLD < LLD 1-133 Ci < LLD < LLD < LLD < LLD 1-135 Ci < LLD < LLD < LLD < LLD Total for Period Ci < LLD < LLD < LLD < LLD

3. PARTICULATES (T 1/2 > 8 DAYS)

Nuclide Released Continuous Modeý Units Qtr 1 Qtr 2 Qtr 3 Qtr 4 CR-51 Ci < LLD < LLD < LLD < LLD MN-54 Ci 5.99E-06 < LLD < LLD < LLD CO-58 Ci < LLD < LLD < LLD < LLD CO-60 Ci 2.20E-05 < LLD < LLD < LLD SR-89 Ci < LLD < LLD < LLD < LLD SR-90 Ci < LLD < LLD < LLD < LLD MO-99 Ci < LLD < LLD < LLD < LLD AG-110M Ci < LLD < LLD < LLD < LLD CS-134 Ci < LLD < LLD < LLD < LLD CS-137 Ci < LLD < LLD < LLD < LLD BA-140 Ci < LLD < LLD < LLD < LLD LA-140 Ci < LLD < LLD < LLD < LLD CE-141 Ci < LLD < LLD < LLD < LLD CE-144 Ci < LLD < LLD < LLD < LLD Total for Period Ci 2.80E-05 < LLD < LLD < LLD Page 13

SITE: LIMERICK GENERATING STATION - UNITS 1 & 2 LICENSEE: EXELON GENERATION COMPANY, LLC TABLE A - 4 GASEOUS EFFLUENTS FOR RELEASE POINT - UNIT 2 SOUTH STACK PERIOD 2008

1. FISSION AND ACTIVATION GASSES Nuclide Released Continuous Mode Units Qtr 1 Qtr 2 Qtr 3 Qtr 4 AR-41 Ci 1.18E-02 4.07E-02 2.60E-03 9.14E-02 KR-85 Ci < LLD < LLD < LLD < LLD KR-85M Ci 2.83E-03 9.75E-03 6.23E-04 2.19E-02 KR-87 Ci 2.83E-03 9.75E-03 6.23E-04 2.19E-02 KR-88 Ci 2.83E-03 9.75E-03 6.23E-04 2.19E-02 XE-133 Ci 6.13E-02 2.11E-01 1.35E-02 4.75E-01 XE-133M Ci < LLD < LLD < LLD < LLD XE-135 Ci 3.21E-02 1.10E-01 7.06E-03 2.48E-01 XE-135M Ci 4.34E-02 1.50E-01 9.56E-03 3.36E-01 XE-138 Ci 6.61 E-03 2.28E-02 1.46E-03 5.12E-02 Total for Period Ci 1.64E-01 5.64E-01 3.60E-02 1.27E+00

2. IODINES Nuclide Released Continuous Mode Units Qtr 1 Qtr 2 Qtr 3 Qtr 4 1-131 Ci < LLD < LLD < LLD < LLD 1-133 Ci < LLD < LLD < LLD < LLD 1-135 Ci < LLD < LLD < LLD < LLD Total for Period Ci < LLD < LLD < LLD < LLD

3. PARTICULATES (T 1/2 > 8 DAYS)

Nuclide Released Continuous Mode Units Qtr 1 Qtr 2 Qtr 3 Qtr 4 CR-51 Ci < LLD < LLD < LLD < LLD MN-54 Ci 1.81 E-05 < LLD < LLD < LLD CO-58 Ci < LLD < LLD < LLD < LLD CO-60 Ci 1.43E-05 < LLD < LLD < LLD SR-89 Ci < LLD < LLD < LLD < LLD SR-90 Ci < LLD < LLD < LLD < LLD MO-99 Ci < LLD < LLD < LLD < LLD AG-110M Ci < LLD < LLD < LLD < LLD CS-134 Ci < LLD < LLD < LLD < LLD CS-137 Ci < LLD < LLD < LLD < LLD BA-140 Ci < LLD < LLD < LLD < LLD LA-140 Ci < LLD < LLD < LLD < LLD CE-141 Ci < LLD < LLD < LLD < LLD CE-144 Ci < LLD < LLD < LLD < LLD Total for Period Ci 3.24E-05 < LLD < LLD < LLD Page 14

SITE: LIMERICK GENERATING STATION - UNITS 1 & 2 LICENSEE: EXELON GENERATION COMPANY, LLC TABLE A - 5 GASEOUS EFFLUENTS FOR RELEASE POINT - HOT MAINTENANCE SHOP PERIOD 2008

1. FISSION AND ACTIVATION GASSES NO ANALYSIS PERFORMED FOR ACTIVATION GASSES. PATHWAY DOES NOT EXIST.

2. IODINES Nuclide Released Continuous Mode Units Qtr 1 Qtr 2 .Qtr 3 Qtr 4 1-131 Ci < LLD < LLD < LLD < LLD 1-133 Ci < LLD < LLD < LLD < LLD 1-135 Ci < LLD < LLD < LLD < LLD Total for Period Ci <LLD < LLD < LLD < LLD

3. PARTICULATES (T 1/2 > 8 DAYS)

Nuclide Released Continuous Mode Units Qtr 1 Qtr 2 Qtr 3 Qtr 4 CR-51 Ci < LLD < LLD < LLD < LLD MN-54 Ci < LLD < LLD < LLD < LLD CO-58 Ci < LLD < LLD < LLD < LLD CO-60 Ci 9.28E-08 9.97E-08 < LLD < LLD SR-89 Ci < LLD < LLD < LLD < LLD SR-90 Ci < LLD < LLD < LLD < LLD MO-99 Ci < LLD < LLD < LLD < LLD AG-11OM Ci < LLD < LLD < LLD < LLD CS-134 Ci < LLD < LLD < LLD < LLD CS-137 Ci < LLD < LLD < LLD < LLD BA-140 Ci < LLD < LLD < LLD < LLD LA-140 Ci < LLD < LLD < LLD < LLD CE-141 Ci < LLD < LLD < LLD < LLD CE-144 Ci < LLD < LLD < LLD < LLD Total for Period Ci 9.28E-08 9.97E-08 < LLD < LLD Page 15

SITE: LIMERICK GENERATING STATION - UNITS 1 & 2 LICENSEE: EXELON GENERATION COMPANY, LLC TABLE A - 6 GASEOUS EFFLUENTS FOR RELEASE POINT - OIL INCINERATION PERIOD 2008 NO OIL BURNING OCCURRED IN 2008.

1. FISSION AND ACTIVATION GASSES NO ANALYSIS PERFORMED FOR ACTIVATION GASSES. PATHWAY DOES NOT EXIST.

2. IODINES Nuclide Released Batch Release Units Qtr 1 Qtr 2 Qtr 3 Qtr 4 1-131 Ci N/A N/A N/A N/A 1-133 Ci N/A N/A N/A N/A 1-135 Ci N/A N/A N/A N/A Total for Period Ci N/A N/A N/A N/A

3. PARTICULATES (T 1/2 > 8 DAYS)

Nuclide Released Batch Release Units Qtr 1 Qtr 2 Qtr 3 Qtr 4 CR-51 Ci N/A N/A N/A N/A MN-54 Ci N/A N/A N/A N/A CO-58 Ci N/A N/A N/A N/A CO-60 Ci N/A N/A N/A N/A SR-89 Ci N/A N/A N/A N/A SR-90 Ci N/A N/A N/A N/A MO-99 Ci N/A N/A N/A N/A AG-110M Ci N/A N/A N/A N/A CS-134 Ci N/A N/A N/A N/A CS-137 Ci N/A N/A N/A N/A BA-140 Ci N/A N/A N/A N/A LA-140 Ci N/A N/A N/A N/A CE-141 Ci N/A N/A N/A N/A CE-144 Ci N/A N/A N/A N/A CE-144 Ci N/A N/A N/A N/A Total for Period Ci N/A N/A N/A N/A Page 16

SITE: LIMERICK GENERATING STATION - UNITS 1 & 2 LICENSEE: EXELON GENERATION COMPANY, LLC TABLE A -7 GASEOUS EFFLUENTS FOR RELEASE POINT - OTHER BATCH RELEASES PERIOD 2008

1. FISSION AND ACTIVATION GASSES Nuclide Released Batch Release Units Qtr 1 Qtr 2 Qtr 3 Qtr 4 AR-41 Ci N/A N/A N/A N/A KR-85 Ci N/A N/A N/A N/A KR-85M Ci N/A N/A N/A N/A KR-87 Ci N/A N/A N/A N/A KR-88 Ci N/A N/A N/A N/A XE-133 Ci N/A N/A N/A N/A XE-133M Ci N/A N/A N/A N/A XE-135 Ci N/A N/A N/A N/A XE-135M Ci N/A N/A N/A N/A XE-138 Ci N/A N/A N/A N/A Total for Period Ci N/A N/A N/A N/A

2. IODINES Nuclide Released Batch Release Units Qtr 1 Qtr 2 Qtr 3 Qtr 4 1-131 Ci < LLD < LLD < LLD < LLD 1-133 Ci < LLD < LLD < LLD < LLD 1-135 Ci < LLD < LLD < LLD < LLD Total for Period Ci < LLD < LLD < LLD < LLD

3. PARTICULATES (T 1/2 > 8 DAYS)

Nuclide Released Batch Release Units Qtr 1 Qtr 2 Qtr 3 Qtr 4 CR-51 Ci < LLD < LLD < LLD < LLD MN-54 Ci 3.29E-06 8.49E-07 < LLD < LLD CO-58 Ci 1.60E-06 < LLD < LLD < LLD CO-60 Ci 1.40E-05 9.71 E-07 < LLD < LLD ZN-65 Ci 3.01 E-06 < LLD < LLD < LLD MO-99 Ci < LLD < LLD < LLD < LLD AG-110M Ci < LLD < LLD < LLD < LLD CS-134 Ci < LLD < LLD < LLD < LLD CS-137 Ci < LLD < LLD < LLD < LLD BA-140 Ci < LLD < LLD < LLD < LLD LA-140 Ci < LLD < LLD < LLD < LLD CE-141 Ci < LLD < LLD < LLD < LLD CE-144 Ci < LLD < LLD < LLD < LLD CE-144 Ci < LLD < LLD < LLD <LLD Total for Period Ci 2.19E-05 1.82E-06 < LLD < LLD Page 17

SITE: LIMERICK GENERATING STATION - UNITS 1 & 2 LICENSEE: EXELON GENERATION COMPANY, LLC TABLE A - 8 LIQUID EFFLUENTS - SUMMATION OF ALL RELEASES PERIOD 2008 A. FISSION AND ACTIVATION PRODUCTS Est.

ErrorTotal Units Qtr 1 Qtr 2 Qtr 3 Qtr 4

1. Total release (not including tritium, Ci 5.07E-03 2.54E-03 5.28E-02 8.93E-03 2.11E+01 gasses & alpha)

2. Average diluted concentration during uCi/mI 2.87E-08 3.13E-08 5.27E-07 1.08E-07 batch discharge for the period

3. Dose - Whole Body mrem 7.24E-04 4.35E-03 6.14E-03 2.28E-03

- Organ mrem 8.62E-04 6.35E-03 9.18E-04 3.34E-03

4. % of ODCM Limit - Whole Body Dose* % 2.41 E-02 1.45E-01 2.05E-01 7.60E-02

- Organ Dose*  % 8.62E-03 6.35E-02 9.18E-03 3.34E-02 B. TRITIUM Est. Total Units Qtr 1 Qtr 2 Qtr 3 Qtr 4 Erroral Error %

1. Total Release Ci 2.03E+01 7.09E+00 6.97E+00 6.75E+00 6.43E+00

2. Average diluted concentration during uCi/mI 1.15E-04 8.73E-05 6.95E-05 8.18E-05 batch discharge for the period

3. % of ODCM Limit - ECL  % 1.15E+00 8.37E-01 6.95E-01 8.18E-01 C. DISSOLVED AND ENTRAINED GASSES Qtr 4 Est. Total Erroral Units Qtr 1 Qtr 2 Qtr 3 Error %

1. Total release Ci 6.65E-04 3.75E-06 2.66E-05 < LLD 2.11E+01

2. Average diluted concentration during uCi/mI 3.76E-09 4.62E-1 1 2.65E-10 < LLD batch discharge for the period 3%of ODCM Limit - ECL  % 1.88E-03 2.31E-05 1.33E-04 N/A D. GROSS ALPHA RADIOACTIVITY Units Qtr 1 Qtr 2 Qtr 3 Qtr 4 Est. Total Error %

1. Total release Ci < LLD <LLD < LLD < LLD 2.30E+01

2. Average diluted concentration during uCi/mI < LLD <LD < LLD < LLD batch discharge for the period Units Qtr 1 Qtr 2 Qtr 3 Qtr 4 Est. Total Error %

E. Volume of waste released (prior to Liters 5.62E+06 2.49E+06 2.47E+06 2.13E+06 5.OOE+00 dilution)

F. Volume of dilution water used during Liters 1.71 E+08 7.88E+07 9.78E+07 8.04E+07 3.56E+00 periodI II

• Percent of limit includes tritium.

Page 18

SITE: LIMERICK GENERATING STATION - UNITS 1 & 2 LICENSEE: EXELON GENERATION COMPANY, LLC TABLE A - 9 LIQUID EFFLUENTS FOR RELEASE POINT - LIQUID RADWASTE PERIOD 2008 Nuclide Released Batch Release.

Units Qtr 1 Qtr 2 Qtr 3 Qtr 4 NA-24 Ci < LLD 7.81 E-06 2.28E-06 2.03E-06 CR-51 Ci 6.79E-04 1.53E-05 < LLD < LLD MN-54 Ci 1.34E-03 8.49E-04 5.66E-04 2.95E-04 FE-55 Ci < LLD < LLD 5.01 E-02 6.92E-03 MN-56 Ci < LLD < LLD < LLD 1.26E-06 CO-58 Ci 1.62E-04 4.64E-05 2.47E-05 5.23E-06 FE-59 Ci 3.84E-04 1.27E-05 < LLD < LLD CO-60 Ci 2.21 E-03 8.84E-04 1.29E-03 8.83E-04 NI-63 Ci < LLD < LLD < LLD < LLD CU-64 Ci < LLD < LLD < LLD < LLD NI-65 Ci < LLD < LLD < LLD < LLD ZN-65 Ci 1.64E-04 5.43E-05 3.14E-04 1.85E-04 ZN-69 Ci < LLD < LLD < LLD < LLD ZN-69M Ci < LLD < LLD 2.45E-06 < LLD SR-89 Ci < LLD < LLD < LLD < LLD SR-90 Ci < LLD < LLD < LLD < LLD NB-95 Ci 2.44E-06 < LLD < LLD < LLD ZR-95 Ci 1.61 E-06 < LLD < LLD < LLD RU-105 Ci 1.44E-06 < LLD < LLD < LLD AG-11iM Ci < LLD < LLD < LLD < LLD SB-1 24 Ci 5.02E-05 6.86E-06 7.84E-06 2.75E-06 SB-125 Ci 3.01 E-05 8.79E-05 2.18E-04 1.71 E-04 1-131 Ci < LLD < LLD < LLD 4.23E-07 1-133 Ci < LLD 6.30E-07 < LLD < LLD CS-134 Ci < LLD 2.31 E-05 8.56E-06 1.84E-05 CS-1 37 Ci 3.64E-05 5.48E-04 2.68E-04 4.50E-04 BA-140 Ci < LLD < LLD < LLD < LLD LA-140 Ci < LLD 7.54E-06 1.26E-05 < LLD CE-141 Ci < LLD < LLD < LLD < LLD CE-144 Ci < LLD < LLD < LLD < LLD Total for Period Ci 5.06E-03 2.54E-03 5.28E-02 8.93E-03 XE-1 33M Ci 5.76E-06 < LLD < LLD < LLD XE-1 33 Ci 3.96E-04 3.75E-06 1.48E-05 < LLD XE-135M Ci 8.06E-07 < LLD < LLD < LLD XE-135 Ci 2.62E-04 < LLD 1.18E-05 < LLD Total for Period Ci 6.65E-04 3.75E-06 2.66E-05 < LLD Page 19

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SITE: LIMERICK GENERATING STATION - UNITS 1 & 2 LICENSEE: EXELON GENERATION COMPANY, LLC ,

Appendix B Solid Waste and Irradiated Fuel Shipments Page 21

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SITE: LIMERICK GENERATING STATION - UNITS 1 & 2 LICENSEE: EXELON GENERATION COMPANY, LLC A. Solid waste shipped offsite for burial or disposal (not irradiated fuel) 01/01/2008 - 12/31/2008

1. Type of waste Type of waste Uni112 Month Period Estimated Error %

a. Spent resin, filters sludges, evaporator bottoms, etc m3 51.90 25%

Ci 2.24E+03

b. Dry compressible waste, contaminated equipment, etc.1 m3 l 58.80 25%

Ci 8.68E+00

c. Irradiated components, control rods, etc. m3 None N/A ci None Other(Describe) MI None N/A Ci None I

2. Estimate of Major Nuclide Composition (By Waste Type)

Category A - Spent Resin, Filters, Sludges, Evaporator Bottoms, etc.

Waste Class Waste Class Waste Class A Percent B Percent C Percent Isotope Curies

• Abundance Curies

• Abundance Curies* Abundance C-14 2.19E-01 0.16% 2.86E-03 0.10% 7.29E-01 0.03%

Mn-54 2.11E+01 15.06% 6.76E-02 2.44% 7.27E+01 3.46%

Fe-55 7.73E+01 55.21% 3.71 E-01 13.42% 1.40E+03 66.55%

Co-58 1.48E+00 1.06% 0.OOE+00 0.00% 6.23E-01 0.03%

Co-60 3.06E+01 21.85% 2.25E+00 81.34% 5.56E+02 26.43%

Ni-63 1.05E+00 0.75% 5.82E-02 2.10% 1.47E+01 0.70%

Zn-65 4.12E+00 2.94% 0.OOE+00 0.00% 5.20E+01 2.47%

Cs-137 1.21 E+00 0.86% 1.25E-02 0.46% 3.15E+00 0.15%

Cr-51 1.11 E+00 0.78% 0.OOE+00 0.00% 1.78E+00 0.08%

Fe-59 2.20E-03 0.01% 0.OOE+00 0.00% 2.54E-01 0.01%

H-3 2.30E-01 0.16% 1.09E-03 0.03% 1.53E-01 0.01%

Pu-241 1.29E+00 0.92% 3.98E-04 0.01% 9.90E-01 0.05%

Sr-90 4.70E-02 0.03% 2.79E-03 0.10% 5.07E-01 0.02%

Ce-144 2.99E-01 0.21% 0.OOE+00 0.00% 1.96E-01 0.01%

Totals 1.40E+02 100.00% 2.77E+00 100.00% 2.1OE+03 100.00%

• Activity is estimated Page 23

SITE: LIMERICK GENERATING STATION - UNITS 1 & 2 LICENSEE: EXELON GENERATION COMPANY, LLC Category B - Dry Compressible Waste, Contaminated Equipment, etc.

Waste Class A Percent Waste Class B Percent Isotope Curies

• Abundance Curies

• Abundance Cr-51 9.65E-01 11.26% 0.00E+00 0.00%

Mn-54 1.61 E+00 18.79% 2.61 E-03 2.44%

Fe-55 1.59E+00 18.55% 1.43E-02 13.38%

Co-58 1.75E-01 2.04% 0.OOE+00 0.00%

Co-60 3.26E+00 38.04% 8.72E-02 81.60%

Fe-59 2.33E-01 2.72% 0.OOE+00 0.00%

Zn-65 2.58E-01 3.01% 0.OOE+00 0.00%

Ni-63 2.37E-01 2.77% 2.27E-03 2.12%

Cs-137 9.75E-02 1.14% 4.86E-04 0.46%

Nb-95 1.44E-01 1.68% 0.OOE+00 0.00%

Totals 8.57E+00 100.00% 1.07E-01 100.00%

• Activity is estimated

3. Solid Waste (Disposition)

Number of Shipments Mode of Transportation Destination 15 Truck Studsvik (THOR) to Barnwell 10 Truck Studsvik (THOR) to Energy Solutions / Clive 35 Truck Duratek to Energy Solutions / Clive 4 Truck Limerick Gen. Sta. To Energy Solutions / Clive 1 Truck Limerick Generating Station to Barnwell Comments:

20 Shipments were made from Limerick to Duratek for processing 7 Shipments were made from Limerick to Studsvik (THOR) for processing No solidifications were performed Category A - 20 shipments Type A LSA Category A - 4 shipments > Type A LSA Category A - 5 shipments Type B Category B - 36 shipments Type A LSA Category C - No shipments made Category D - No shipments made B. Irradiated Fuel Shipments (disposition) lNumber of Shipmentsl Mode of Transportation Destination 10 1N/A IN/A Page 24

SITE: LIMERICK GENERATING STATION - UNITS 1 & 2 LICENSEE: EXELON GENERATION COMPANY, LLC C. Changes to the Process Control Program Revision 6 to procedure RW-AA-100, "Process Control Program For Radioactive Waste" was implemented in 2008. Step 4.2.10 was changed to specify the documentation required for High Integrity Containers (HIC) at the burial site. The revision did not make any changes to the Process Control Program at Limerick.

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SITE: LIMERICK GENERATING STATION - UNITS 1 & 2 LICENSEE: EXELON GENERATION COMPANY, LLC Appendix C Radiological Impact to Man Page 27

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SITE: LIMERICK GENERATING STATION - UNITS 1 & 2 LICENSEE: EXELON GENERATION COMPANY, LLC Per ODCM Control 6.2, the Annual Radioactive Effluent Release Report shall include an assessment of the radiation doses to the hypothetically highest exposed MEMBER OF THE PUBLIC from reactor releases and other nearby uranium fuel cycle sources. For purposes of this calculation the following assumptions were made:

Gaseous

• Annual average meteorology and actual gaseous effluent releases were used.

• Beta air dose attributed to noble gas releases.

• The sector with the highest x/Q, x/Q depleted and D/Q was the SE sector at Site Boundary 762 meters.

• All significant pathways were assumed to be present

" Occupancy factor was considered 100%.

Liquid

• Average river flow rate for the year (2.91 OE+03 cfs) was used.

A summary of gaseous and liquid radiation doses to members of the public at these locations was as follows:

Effluent Applicable Estimated Age Location  % of Limit Unit Organ Dose Group Distance Direction Applicable (meters) (toward) Limit Noble Gas Gamma - Air Dose 8.55E-03 All 762 SE 4.28E-02 20 mRad Noble Gas Beta - Air Dose 5.22E-03 All 762 SE 1.31 E-02 40 mRad Noble Gas Total Body (Gamma) 5.32E-03 All 762 SE 5.32E-02 10 mrem Noble Gas Skin (Beta) 9.93E-03 All 762 SE 3.31 E-02 30 mrem Iodine, Particulate & GI-LLI 5.87E-03 Child 762 SE 1.96E-02 30 mrem Tritium Liquid Total Body 7.11E-03 Adult LGS Outfall 1.19E-01 6 mrem Liquid Liver 1.02E-02 Teen LGS Outfall 5.10E-02 20 mrem Doses calculated were well below all ODCM and 40 CFR Part 190 limits of 25 mrem to a real individual.

The ODCM does not require population doses to be calculated.

ODCM Control 6.2 also requires that the Annual Effluent Release Report shall include an assessment of the radiation doses from radioactive liquid and gaseous effluents to members of the public due to activities inside the Site Boundary during the report period. ODCM Controls state that MEMBER OF THE PUBLIC shall include all persons not occupationally associated with the plant. This category does not include employees of the utility or contractors. Also excluded from this category are persons who enter the site to service equipment or to make deliveries. This category does include persons who use portions of the site for recreational, occupational education, or other purposes not associated with the plant. Areas within the site boundary, where radiation dose of this type could occur include the Limerick Information Center on Longview Road near the rear exit of the plant, Frick's Lock on the west shore of the Schuylkill River and the railroad tracks that runs along the east shore of the River. The dose to State Police and National Guard personnel around the location of the Security Checkpoint was also included in this report. The radiation doses to Members of the Public have been estimated using methodology stated in the ODCM. The maximum gaseous dose to members of the public at these locations is based on the following assumptions:

• Annual average meteorology and actual effluent releases were used.

• Beta air dose attributed to noble gas releases.

• Dose is from ground plane and inhalation only. No ingestion dose.

• Adult age group was used for the State Police and National Guard Dose.

Page 29

SITE: LIMERICK GENERATING STATION - UNITS 1 & 2 LICENSEE: EXELON GENERATION COMPANY, LLC The calculated annual average x/Q, x/Q depleted and D/Q for the highest exposed sector for the railroad tracks (W), and the sectors encompacing the Security Checkpoint, Frick's Lock and the Information Center were -used.

• The maximum expected occupancy factor is 25% of a working year at all locations.

• Distance to the railroad tracks, which pass through the Site Boundary in the W sector, is approximately 225 meters.

• Distance to the Limerick Information Center is approximately 884 meters in the ESE sector.

• Distance to Frick's Lock is approximately 450 meters in the WSW sector.

• Distance to Security Checkpoint is approximately 682 meters in the NNE sector.

A summary of gaseous radiation doses to members of the public at these locations is as follows:

Approx. GAMMA Beta Air Iodine/Part/H3 Distance AIR Dose, Organ Dose, Location Sector DOSE, (meters) MRAD(1 ) MRAD(2) MREM(3 >

Frick's Lock WSW 450 7.04E-04 4.30E-04 1.10E-04 Info. Center ESE 884 9.59E-04 5.85E-04 1.63E-04 R.R. Tracks W 225 4.14E-03 2.53E-03 6.50E-04 National Guard / Security NNE 682 6.34E-04 3.87E-04 1.04E-04 Check Point I I Notes:

(1) The limit for Gamma Air Dose = 20 mRad/Yr (ref. ODCM 3.2.2.2.b)

(2) The limit for Beta Air Dose = 40 mRad/Yr (ref. ODCM 3.2.2.2.b)

(3) The limit for Iodine/Particulate/H-3 Organ Dose = 30 mrem/Yr (ref. ODCM 3.2.2.3.b)

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SITE: LIMERICK GENERATING STATION - UNITS 1 & 2 LICENSEE: EXELON GENERATION COMPANY, LLC Appendix D Meteorological Data Page 31

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SITE: LIMERICK GENERATING STATION - UNITS 1 & 2 LICENSEE: EXELON GENERATION COMPANY, LLC

• LIST OF TABLES PAGE Table D - 1 Wind Speed by Direction Measured at 30 Feet for Various Stability Classes for the Limerick Generating Station, January- March, 2008 35 Table D - 2 Wind Speed by Direction Measured at 175 Feet for Various Stability Classes for the Limerick Generating Station, January- March, 2008 42 Table D - 3 Wind Speed by Direction Measured at 30 Feet for Various Stability Classes for the Limerick Generating Station, April - June, 2008 49 Table D - 4 Wind Speed by Direction Measured at 175 Feet for Various Stability Classes for the Limerick Generating Station, April - June, 2008 56 Table D - 5 Wind Speed by Direction Measured at 30 Feet for Various Stability Classes for the Limerick Generating Station, July - September, 2008 63 Table D - 6 Wind Speed by Direction Measured at 175 Feet for Various Stability Classes for the Limerick Generating Station, July - September, 2008 70 Table D - 7 Wind Speed by Direction Measured at 30 Feet for Various Stability Classes for the Limerick Generating Station, October - December, 2008 77 Table D - 8 Wind Speed by Direction Measured at 175 Feet for Various Stability Classes for the Limerick Generating Station, October - December, 2008 84 Table D - 9 Wind Speed by Direction Measured at 30 Feet for Various Stability Classes for the Limerick Generating Station, January - December, 2008 91 Table D - 10 Wind Speed by Direction Measured at 175 Feet for Various Stability Classes for the Limerick Generating Station, January - December, 2008 93 Table D - 11 Annual x/Q, x/Q depleted and D/Q values for the North Stack, Limerick Generating Station, 2008 95 Table D - 12 Annual x/Q, x/Q depleted and D/Q values for the South Stack, Limerick Generating Station, 2008 97 Page 33

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SITE: LIMERICK GENERATING STATION - UNITS 1 & 2 LICENSEE: EXELON GENERATION COMPANY, LLC Table D - 1 Wind Speed by Direction Measured at 30 Feet for Various Stability Classes for the Limerick Generating Station, January - March, 2008 Period of Record: January - March 2008 Stability Class - Extremely Unstable - 171Ft-26Ft Delta-T (F)

Winds Measured at 30 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total 1 0 0 0 1 N 0 0 0 0 0 0 NNE 0 0 0 0 0 0 0 NE 0 2 2 0 0 0 0 ENE 0 0 0 0 0 0 0 E 0 1 1 0 0 0 0 ESE 0 2 2 0 0 0 0 SE 0 0 0 0 0 0 0 SSE 0 1 1 4 0 0 0 S 0 3 7 8 0 0 0 SSW 0 5 13 3 0 0 0 SW 0 0 3 0 0 0 0 WSW 0 4 4 7 3. 0 0 W 0 0 10 7 6 0 0 WNW 1 4 18 NW 0 5 6 4 0 0 15 NNW 0 2 8 1 0 0 11 Variable 0 0 0 0 0 0 0 Total 1 29 44 14 0 0 88 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 6 Page 35

SITE: LIMERICK GENERATING STATION - UNITS 1 & 2 LICENSEE: EXELON GENERATION COMPANY, LLC Table D - 1 Wind Speed by Direction Measured at 30 Feet for Various Stability Classes for the Limerick Generating Station, January - March, 2008 Period of Record: January - March 2008 Stability Class - Moderately Unstable - 171Ft-26Ft Delta-T (F)

Winds Measured at 30 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 3 NNE 0 3 NE 0 0 ENE 0 1 E 0 4 ESE 0 4 SE 0 0 SSE 0 1 S 0 1 SSW 0 2 SW 0 2 WSW 0 3 W 2 2 6 2 0 0 12 WNW 0 5 6 4 0 0 15 NW 0 8 9 16 1 0 34 0 3 5 1 1 0 10 Variable 0 0 0 0 0 0 0 Total 3 31 35 24 2. 0 95 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 6 Page 36

SITE: LIMERICK GENERATING STATION - UNITS 1 & 2 LICENSEE: EXELON GENERATION COMPANY, LLC Table D - 1 Wind Speed by Direction Measured at 30 Feet for Various Stability Classes for the Limerick Generating Station, January - March, 2008 Period of Record: January - March 2008 Stability Class - Slightly Unstable - 17lFt-26Ft Delta-T (F)

Winds Measured at 30 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total 1 0 0 0 N 2 2 5 0 0 0 0 NNE 1 0 1 1 0 0 0 0 1 NE 0 1 0 0 0 0 1 ENE 0 2 0 0 0 E 1 3 6 1 0 0 0 ESE 0 2 3 0 0 0 0 SE 1 2 3 1 0 0 0 SSE 1 1 3 0 0 0 0 S 0 2 2 SSW 0 0 1 1 0 0 2 SW 0 1 0 0 0 0 1 WSW 1 3 0 0 0 0 4 W 0 3 5 2 0 0 10 WNW 0 11 6 3 0 0 20 NW 0 5 16 19 5 0 45 1 5 1 0 0 NNW 1 8 Variable 0 0 0 0 0 0 0 Total 8 38 38 26 5 0 115 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 1 Hours of missing stability measurements in all stability classes: 6 Page 37

SITE: LIMERICK GENERATING STATION - UNITS 1 & 2 LICENSEE: EXELON GENERATION COMPANY, LLC Table D - 1 Wind Speed by Direction Measured at 30 Feet for Various Stability Classes for the Limerick Generating Station, January - March, 2008 Period of Record: January - March 2008 Stability Class - Neutral - 17lFt-26Ft Delta-T (F)

Winds Measured at 30 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > *24 Total N 16 16 7 1 0 0 40 NNE 21 6 0 0 0 0 27 NE 22 4 0 0 0 0 26 ENE 20 24 1 0 0 0 45 E 15 41 22 0 0 0 78 ESE 7 15 7 0 0 0 29 SE 4 14 5 0 0 0 23 SSE 6 7 2 0 0 0 15 S 2 7 5 0 0 0 14 SSW 3 11 7 0 0 0 21 SW 3 8 2 0 0 0 13 WSW 7 8 0 0 0 0 15 W 3 13 23 11 1 0 51 WNW 17 23 70. 20 0 0 130 NW 12 69 114 78 17 0 290 NNW 11 22 45 19 0 0 97 Variable 0 0 0 0 0 0 0 Total 169 288 310 129 18 0 914 Hours of calm in this stability class: 5 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 6 Page 38

SITE: LIMERICK GENERATING STATION - UNITS 1 & 2 LICENSEE: EXELON GENERATION COMPANY, LLC Table D - 1 Wind Speed by Direction Measured at 30 Feet for Various Stability Classes for the Limerick Generating Station, January - March, 2008 Period of Record: January- March 2008 Stability Class - Slightly Stable - 171Ft-26Ft Delta-T (F)

Winds Measured at 30 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 11 14 3 0 0 0 28 NNE 9 14 1 0 0 0. 24 NE 11 6 0 0 0 0 17 ENE 1i 7 0 0 0 0 18 E 15 27 10 0 0 0 52 ESE 4 8 3 0 0 0 15 SE 10 13 1 0 0 0 24 SSE 3 14 7 2 0 0 26 S 7 26 16 0 0 0 49 SSW 11 12 25 0 0 0 48 SW 11 9 4 2 0 0 26 WSW 29 8 3 1 0 0 41 W 24 30 10 4 0 0 68 WNW 32 60 9 0 0 0 101 NW 14 48 10 4 0 0 76 NNW 15 17 2 1 0 0 35 Variable 0 0 0 0 0 0 0 Total 217 313 104 14 0 0 648 Hours of calm in this stability class: 12 Hours of missing wind measurements in this stability class: 3 Hours of missing stability measurements in all stability classes: 6 Page 39

SITE: LIMERICK GENERATING STATION - UNITS 1 & 2 LICENSEE: EXELON GENERATION COMPANY, LLC Table D - 1 Wind Speed by Direction Measured at 30 Feet for Various Stability Classes for the Limerick Generating Station, January - March, 2008 Period of Record: January - March 2008 Stability Class - Moderately Stable - l7lFt-26Ft Delta-T (F)

Winds Measured at 30 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 13 1 0 0 0 0 14 NNE 4 0 0 0 0 0 4 NE 9 0 0 0 0 0 9 ENE 6 0 0 0 0 0 6 E 8 3 0 0 0 0 11

.ESE 10 1 0 11 SE 5 0 0 6 SSE 6 2 0 8 S 3 6 0 9 SSW 3 2 0 5 SW 9 1 0 10 WSW 9 1 0 10 W 11 2 0 13 WNW 18 4 0 22 NW 18 1 0 19 NNW 10 2 0 13 Variable 0 0 0 0 Total 142 26 0 170 Hours of calm in this stability class: 13 Hours of missing wind measurements in this stability class: 1 Hours of missing stability measurements in all stability classes: 6 Page 40

SITE: LIMERICK GENERATING STATION - UNITS 1 & 2 LICENSEE: EXELON GENERATION COMPANY, LLC Table D - 1 Wind Speed by Direction Measured at 30 Feet for Various Stability Classes for the Limerick Generating Station, January - March, 2008 Period of Record: January - March 2008 Stability Class - Extremely Stable - 171Ft-26Ft Delta-T (F)

Winds Measured at 30 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 9 0 9 NNE 3 0 3 NE 4 0 4 ENE 1 0 1 E 3 0 3 ESE 4 0 4 SE 7 0 9 SSE 1 0 1 S 0 0 0 SSW 4 0 4 SW 2 0 2 WSW 6 0 6 W 9 0 9 WNW 16 0 0 0 0 0 16 NW 8 1 0 0 0 0 9 NNW 14 0 0 0 0 0 14 Variable 0 0 0 0 0 0 0 Total 91 3 0 0 0 0 94 Hours of calm in this stability class: 17 Hours of missing wind measurements in this stability class: 2 Hours of missing stability measurements in all stability classes: 6 Page 41

SITE: LIMERICK GENERATING STATION - UNITS 1 &?2 LICENSEE: EXELON GENERATION COMPANY, LLC Table D - 2 Wind Speed by Direction Measured at 175 Feet for Various Stability Classes for the Limerick Generating Station, January - March, 2008 Period of Record: January -. March 2008 Stability Class - Extremely Unstable - 171Ft-26Ft Delta-T (F)

Winds Measured at 175 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 0 0 0 0 0 NNE 0 0 0 0 0 0 0 NE 0 2 0 0 0 0 2 ENE 0 0 0 0 0 0 0 E 0 1 1 0 0 0 2 ESE 0 0 1 0 0 .0 1 SE 0 0 0 0 0 0 0 SSE 0 1 1 0 0 0 2 S 0 2 4 2 0 0 8 SSW 0 1 6 6 1 0 14 SW 0 1 1 0 0 0 2 WSW 0 0 2 3 2 1 8 W 0 0 2 5 2 3 12 1 3 8 5 5 0 22 WNW 0 0 3 0 1 0 4 NNW 0 2 3 6 0 0 11 Variable 0 0 0 0 0 0 0 Total 1 13 32 27 11 4 88 Hours of calm in this stability class:. 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stab:ility measurements in all stability classes: 6 Page 42

SITE: LIMERICK GENERATING STATION - UNITS 1 & 2 LICENSEE: EXELON GENERATION COMPANY, LLC Table D - 2 wind Speed by Direction Measured at 175 Feet for Various Stability Classes for the Limerick Generating Station, January - March, 2008 Period of Record: January - March 2008 Stability Class - Moderately Unstable - 171Ft-26Ft Delta-T (F)

Winds Measured at 175 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 3 NNE 0 0 1 NE 0 0 0 ENE 0 0 1 E 0 0 4 ESE 0 0 3 SE 0 0 2 SSE 0 0 1 S 0 0 0 SSW 0 0 3 SW 0 0 1 WSW 0 0 7 W 1 1 18 WNW 0 3 6 8 8 2 27 NW 0 1 7 2 5 1 16 NNW 0 3 3 2 0 0 8 Variable 0 0 0 0 0 0 0 Total 1 19 29 21 21 4 95 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stabi lity class: 0 Hours of missing stability measurements in all s tability classes: 6 Page 43

SITE: LIMERICK GENERATING STATION - UNITS 1 & 2 LICENSEE: EXELON GENERATION COMPANY, LLC Table D - 2 Wind Speed by Direction Measured at 175 Feet for Various Stability Classes for the Limerick Generating Station, January - March, 2008 Period of Record: January - March 2008 Stability Class - Slightly Unstable - 171Ft-26Ft Delta-T (F)

Winds Measured at 175 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 1 0 4.

NNE 0 0 0 NE 0 0 1 ENE 1 0 5 E 0 0 3 ESE 0 0 4 SE 0 0 2 SSE 0 0 3 S 1 0 2 SSW 0 0 3 SW 0 0 3 WSW 0 0 7 W 0 2 16 1 3 8 5 10 2 29 NW 0 3 5 10 7 3 28 NNW 1 1 2 2 0 0 6 Variable 0 0 0 0 0 0 0 Total 5 25 31 25 23 7 116 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 6 Page 44

SITE: LIMERICK GENERATING STATION - UNITS 1 & 2 LICENSEE: EXELON GENERATION COMPANY, LLC Table D - 2 Wind Speed by Direction Measured at 175 Feet for Various Stability Classes for the Limerick Generating Station, January - March, 2008 Period of Record: January - March 2008 Stability Class - Neutral - 171Ft-26Ft Delta-T (F)

Winds Measured at 175 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 5 16 5 0 31 NNE 12 19 0 0 31 NE 11 16 1 0 28 ENE- 8 24 21 0 55 E 8 30 29 0 74 ESE 2 10 12 0 27 SE 3 3 15 0 24 SSE 1 9 6 0 18 S 3 5 5 0 20 SSW 1 1 10 0 18 SW 6 6 3 0 0 16 WSW 3 6 6 4 0 1 20 W 3 10 9 35 24 12 93 WNW 5 14 48 89 44 16 216 NW 8 22 41 57 *23 7 158 NNW 5 13 33 29 7 0 87 Variable 0 0 0 0 0 0 0 Total 79 204 24.7 251 99 36 916 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 3 Hours of missing stability measurements in all stability classes: 6 Page 45

SITE: LIMERICK GENERATING STATION - UNITS 1 & 2 LICENSEE: EXELON GENERATION COMPANY, LLC Table D - 2 Wind Speed by Direction Measured at 175 Feet for Various Stability Classes for the Limerick Generating Station, January - March, 2008 Period of Record: January - March 2008 Stability Class - Slightly Stable - 171Ft-26Ft Delta-T (F)

Winds Measured at 175 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 3 9 17 2 0 0 31 NNE 1 6 7 2 0 0 16 NE 4 5 1 0 0 0 10 ENE 4 17 6 0 0 0 27 E 4 16 23 9 0 0 52 ESE 2 7 6 1 0 0 16 SE 1 13 7 3 0 0 24 SSE 1 4 8 7 1 1i 22 S 2 12 27 21 7 0 69 SSW 2 9 13 12 7 1 44 SW 3 18 11 3 5 2 42 WSW 1 14 12 3 2 2 34 W 2 17 31 17 2 0 69 WNW 3 33 57 12 0 2 107 NW 3 11 41 7 1 0 63 NNW 3 12 12 2 0 0 29 Variable 0 0 0 0 0 0 0 Total 39 203 279 101 25 8 655 Hours of calm in this stability class: 1 Hours of missing wind measurements in this stability class: 7 Hours of missing stability measurements in all stability classes: 6 Page 46

SITE: LIMERICK GENERATING STATION - UNITS 1 & 2 LICENSEE: EXELON GENERATION COMPANY, LLC Table D - 2 Wind Speed by Direction Measured at 175 Feet for Various Stability Classes for the Limerick Generating Station; January - March, 2008 Period of Record: January - March 2008 Stability Class - Moderately Stable - 171Ft-26Ft Delta-T (F)

Winds Measured at 175 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 3 6 1 0 0 0 10 NNE 3 2 4 0 0 0 9 NE 3 2 0 0 0 0 5 ENE 3 3 0 0 0 0 6 E 2 6 2 0 0 0 10 ESE 2 4 0 0 0 0 6 SE 1 4 0 0 0 0 5 SSE 6 6 1 1 0 0 14 S 1 8 3 0 0 0 12 SSW 5 7 6 0 0 0 18 SW 3 5 4 1 0 0 13 WSW 0 7 2 2 0 0 11 W 3 8 5 0 0 0 16 WNW 2 10 5 0 0 0 17 NW 1 13 4 0 0 0 18 NNW 4 6 3 0 0 0 13 Variable 0 0 0 0 0 0 0 Total 42 97 40 4 0 0 183 Hours of calm in this stability class: 1 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 6 Page 47

SITE: LIMERICK GENERATING STATION - UNITS 1 & 2 LICENSEE: EXELON GENERATION COMPANY, LLC Table D - 2 Wind Speed by Direction Measured at 175 Feet for Various Stability Classes for the Limerick Generating Station, January - March, 2008 Period of Record: January - March 2008 Stability Class - Extremely Stable - 17lFt-26Ft Delta-T (F)

Winds Measured at 175 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 3 6 0 0 0 0 9 NNE 0 11 NE 0 4 ENE 0 4 E 0 2 ESE 0 2 SE 0 4 SSE 0 3 S 0 7 SSW 0 7 SW 0 8 WSW 0 15 W 0 7 WNW 0 13 NW 4 4 2 0 0 0 10 NNW 3 2 1 0 0 0 6 Variable 0 0 0 0 0 0 0 Total 44 57 10 1 0 0 112 Hours of calm in this stability class: 1 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 6 Page 48

SITE: LIMERICK GENERATING STATION - UNITS 1 & 2 LICENSEE: EXELON GENERATION COMPANY, LLC Table D - 3 Wind Speed by Direction Measured at 30 Feet for Various Stability Classes for the Limerick Generating Station, April - June, 2008 Period of Record: April - June 2008 Stability Class - Extremely Unstable - 171Ft-26Ft Delta-T (F)

Winds Measured at 30 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 10 NNE 0 0 3 NE 0 0 0 ENE 0 0 2 E 0 0 4 ESE 0 0 6 SE 0 0 0 SSE 0 0 4 S 1 0 8 SSW 1 0 11 SW 0 0 4 WSW 0 0 8 W 0 0 5 WNW 2 0 16 NW 1 8 12 3 0 0 24 NNW 1 3 11 0 0 0 15 Variable 0 0 0 0 0 0 0 Total 6 49 58 7 0 0 120 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes:

Page 49

SITE: LIMERICK GENERATING STATION - UNITS 1 & 2 LICENSEE: EXELON GENERATION COMPANY, LLC Table D - 3 Wind Speed by Direction Measured at 30 Feet for Various Stability Classes for the Limerick Generating Station, April - June, 2008 Period of Record: April - June 2008 Stability Class - Moderately Unstable - l7lFt-26Ft Delta-T (F)

-Winds Measured at 30 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 6 NNE 0 0 1 NE 1 0 1 ENE 0 0 0 E 0 0 6 ESE 0 0 6 SE 0 0 2 SSE 0 0 1 S 1 0 2 SSW 0 0 8 SW 0 0 4 WSW 0 0 1 W 1 0 2 WNW 0 0 8 NW 3 4 16 2 0 0 25 NNW 1 0 4 4 0 0 9 Variable 0 0 0 0 0 0 0 Total 7 28 39 8 0 0 82 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 1 Page 50

SITE: LIMERICK GENERATING STATION - UNITS 1 & 2 LICENSEE: EXELON GENERATION COMPANY, LLC Table D - 3 Wind Speed by Direction Measured at 30 Feet for Various Stability Classes for the Limerick Generating Station, April - June, 2008 Period of Record: April - June 2008 Stability Class - Slightly Unstable - 171Ft-26Ft Delta-T (F)

Winds Measured at 30 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 5 NNE 0 0 2 NE 0 0 0 ENE 0 0 4 E 0 0 19 ESE 0 9 SE 1 0 4 SSE 0 0 1 S 1 0 2 SSW 0 0 5 SW 1 0 7 WSW 0 0 4 W 2 0 8 WNW 2 5 5 0 0 0 12 0 5 11 2 0 0 18 NNW 0 1 1 2 0 0 4 Variable 0 0 0 0 0 0 0 Total 7 43 46 8 0 0 104 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 1 Page 51

SITE: LIMERICK GENERATING STATION - UNITS 1 & 2 LICENSEE: EXELON GENERATION COMPANY, LLC Table D - 3 Wind Speed by Direction Measured at 30 Feet for Various Stability Classes for the Limerick Generating Station, April - June, 2008 Period of Record: April - June 2008 Stability Class - Neutral - 17lFt-26Ft Delta-T (F)

Winds Measured at 30 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 5 15 19 0 0 39 NNE 9 14 3 0 0 26 NE 17 16 1 0 0* 34 ENE 20 26 14 5 0 65 E 3 50 53 8 0 114

.ý6 ESE 14 10 6 0 36 SE 5 5 0 0 0 10 SSE 8 7 1 0 0 16 S 6 14 5 0 0 25 SSW 9 27 15 1 0 52 SW 6 36 2 1 0 45 WSW 12 36 1 0 0 49 W 11 37 2 0 0 50 WNW 12 39 9 0 0 60 NW 14 49 41 13 3 120 NNW 5 23 23 4 0 55 Variable 0 0 0 0 0 0 Total 148 408 199 38 3 0 796 Hours of calm in this stability class: 7 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 1 Page 52

SITE: LIMERICK GENERATING STATION - UNITS 1 & 2 LICENSEE: EXELON GENERATION COMPANY, LLC Table D - 3 Wind Speed by Direction Measured at 30 Feet for Various Stability Classes for the Limerick Generating Station, April - June, 2008 Period of Record: April - June 2008 Stability Class - Slightly Stable - 171Ft-26Ft Delta-T (F)

Winds Measured at 30 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 7 20 17 0 0 0 44 NNE 8 7 0 0 0 0 15 NE 13 4 1 0 0 0 18 ENE 15 17 6 3 0 0 41 E 8 15 8 0 0 0 31 ESE 3 7 7 0 0 0 17 SE 6 6 0 0 0 0 12 SSE 6 10 1 0 0 0 17 S 6 25 4 0 35 SSW 6 19 10 0 36 SW 21 11 1 0 33 WSW 18 15 0 0 33 W 27 19 2 0 48 WNW 30 34 0 0 66 NW 24 36 16 0 76 NNW 14 8 7 0 29 Variable 0 0 0 0 0 Total 212 253 80 0 551 Hours of calm in this stability class: 13 Hours of missing wind measurements in this stability class: 4 Hours of missing stability measurements in all stability cliasses: 1 Page 53

SITE: LIMERICK GENERATING STATION - UNITS 1 & 2 LICENSEE: EXELON GENERATION COMPANY, LLC Table D - 3 Wind Speed by Direction Measured at 30 Feet for Various Stability Classes for the Limerick Generating Station,

.April - June, 2008 Period of Record: April - June 2008 Stability Class - Moderately Stable - 171Ft-26Ft Delta-T (F)

Winds Measured at 30 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 9 0 0 0 0 0 9 NNE 2 2 0 0 0 0 4 NE 8 0 0 0 0 0 8 ENE 6 0 0 0 0 0 6 E 0 1 0 0 0 0 1 ESE 1 1 1 0 0 0 3 SE 3 1 0 0 0 0 4 SSE 1 2 0 0 0 0 3 S 4 9 0 0 0 0 13 SSW 6 5 0 0 0 0 11 SW 15 3 0 0 0 0 18 WSW 15 0 0 0 0 0 15 W 29 0 0 0 0 0 29 WNW 32 2 0 0 0 0 34 NW 25 3 0 0 0 0 28 NNW 16 2 0 0 0 0 18 Variable 0 0 0 0 0 0 0 Total 172 31 1 0 0 0 204 Hours of calm in this stability class: 28 Hours of missing wind measurements in this stability class: 7 Hours of missing stability measurements in-all stability cl asses: 1 Page 54

SITE: LIMERICK GENERATING STATION - UNITS 1 & 2 LICENSEE: EXELON GENERATION COMPANY, LLC Table D - 3 Wind Speed by Direction Measured at 30 Feet for Various Stability Classes for the Limerick Generating Station, April - June, 2008 Period of Record: April - June 2008 Stability Class - Extremely Stable - 17lFt-26Ft Delta-T (F)

Winds Measured at 30 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total 0 0 0 0 N 11 1 12 0 0 0 0 NNE 6 0 6 0 0 0 0 NE 6 1 7 0 0 0 0.

ENE 2 0 2 0 0 0 0 E 5 1 6 0 0 0 0 ESE 4 0 4 0 0 0 0 SE 4 0 4 0 0 0 0 SSE 2 0 2 5 0 0 0 0 S 7 12 0 0 0 0 SSW 10 7 17 0 0 0 0 SW 18 0 18 0 0 0 0 0 WSW 13 13 0 0 0 0 0 W 14 14 0 0 0 0 0 WNW 34 34 0 0 0 0 NW 26 3 29 0 0 0 0 NNW 11 1 12 Variable 0 0 0 0 0 0 0 Total 173 19 0 0 0 0 192 Hours of calm in this stability class: 63 Hours of missing wind measurements in this stability class: 12 Hours of missing stability measurements in all stability classes: 1 Page 55

SITE: LIMERICK GENERATING STATION - UNITS 1 & 2 LICENSEE: EXELON GENERATION COMPANY, LLC Table D - 4 Wind Speed by Direction Measured at 175 Feet for Various Stability Classes for the Limerick Generating Station, April - June, 2008 Period of Record: April - June 2008 Stability Class - Extremely Unstable - l7lFt-26Ft Delta-T (F)

Winds Measured at 175 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 10 NNE 2 NE 0 ENE 5 E 2 ESE 5 SE 0 SSE 4 S 12 SSW 8 SW 5 WSW 9 W 13 WNW 20 NW 16 NNW 9 Variable 0 Total 3 20 53 37 7 0 120 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: I Page 56

SITE: LIMERICK GENERATING STATION - UNITS 1 & 2 LICENSEE: EXELON GENERATION COMPANY, LLC Table D - 4 Wind Speed by Direction Measured at 175 Feet for Various Stability Classes for the Limerick Generating Station, April - June, 2008 Period of Record: April - June 2008 Stability Class - Moderately Unstable - 171Ft-26Ft Delta-T (F)

Winds Measured at 175 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 5 NNE 0 0 1 NE 0 0 0 ENE 0 0 0 E 0 0 7 ESE 0 0 5 SE 0 0 2 SSE 0 0 1 S 0 0 3 SSW 0 0 7 SW 0 0 4 WSW 0 0 2 W 1 0 5 WNW 0 3 10 6 1 0 20 NW 2 1 2 6 3 0 14 NNW 0 1 2 3 0 0 6 Variable 0 0 0 0 0 0 0 Total 3 14 37 23 5 0 82 Hours of calm in this stability class: 0" Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes:

Page 57

SITE: LIMERICK GENERATING STATION - UNITS 1 & 2 LICENSEE: EXELON GENERATION COMPANY, LLC Table D - 4. Wind Speed by Direction Measured at 175 Feet for Various Stability Classes for the Limerick Generating Station, April - June, 2008 Period of Record: April - June 2008 Stability Class - Slightly Unstable - 171Ft-26Ft Delta-T (F)

Winds Measured at 175 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 2 3 0 0 0 5 NNE 0 0 1 0 0 0 1 NE 0 0 0 0 0 0 0 ENE 0 2 4 1 0 0 7 E 0 6 4 7 1 0 18 ESE 0 3 5 0 0 0 8 SE 0 2 0 0 0 0 2 SSE 0 1 0 0 0 0 1 S 1 2 0 0 0 0 3 SSW 1 1 1 4 1 0 8 SW 0 0 3 0 2 0 5 WSW 0 1 3 2 0 0 6 W 2 1 3 2 3 0 11 WNW 1 6 10 1 0 18 NW 1 1 0 2 3 1 0 8 0 0 1 1 1 0 3 Variable 0 0 0 0 0 0 0 Total 6 22 36 30 10 0 104 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 1 Page 58

SITE: LIMERICK GENERATING STATION - UNITS 1 & 2 LICENSEE: EXELON GENERATION COMPANY, LLC Table D - 4 Wind Speed by Direction Measured at 175 Feet for Various Stability Classes for the Limerick Generating Station, April - June, 2008 Period of Record: April - June 2008 Stability Class - Neutral - 171Ft-26Ft Delta-T (F)

Winds Measured at 175 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total 19 7 0 0 N 2 12 40 9 3 0 0 NNE 5 7 24 NE 4 21 10 1 5 0 41 ENE 3 24 36 15 0 0 78 E 3 17 44 33 6 0 103 ESE 2 11 11 3 2 0 29 SE 4 5 3 0 0 0 12 SSE 2 3 4 1 0 0 10 S 3 10 18 7 0 0 38 SSW 2 14 20 13 4 0 53 SW 2 15 29 4 0 0 50 WSW 5 19 24 12 0 0 60 W 7 18 34 15 1 0 75 WNW 2 23 30 17 0 4 76 NW 6 15 26 26 4 0 77 NNW 1 6 19 11 0 0 37 Variable 0 0 0 0 0 0 0 Total 53 220 336 168 22 -4 803 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability cl asses: 1 Page 59

SITE: LIMERICK GENERATING STATION - UNITS 1 & 2 LICENSEE: EXELON GENERATION COMPANY, LLC Table D - 4 Wind Speed by Direction Measured at 175 Feet for Various Stability Classes for the Limerick Generating Station, April - June, 2008 Period of Record: April - June 2008, Stability Class - Slightly Stable - 171Ft-26Ft Delta-T (F)

Winds Measured at 175 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 10 19 10 40 NNE 9 4 1 17 NE 9 7 2 24 ENE 13 12 4 35 E 12 12 5 33 ESE 6 4 6 19 SE 4 7 1 13 SSE 2 8 3 16 S 9 26 8 46 SSW 10 11 13 37 SW 9 17 2 32 WSW 13 18 3 45 W 20 30 5 60 WNW 26 44 10 85 NW 10 23 6 43 NNW 4 13 4 23 Variable 0 0 0 0 Total 53 166 255 83 9 2 568 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 1 Page 60

SITE: LIMERICK GENERATING STATION - UNITS 1 & 2 LICENSEE: EXELON GENERATION COMPANY, LLC Table D - 4 Wind Speed by Direction Measured at 175 Feet for Various Stability Classes for the Limerick Generating Station, April - June, 2008 Period of Record: April - June 2008 Stability Class - Moderately Stable - 171Ft-26Ft Delta-T (F)

Winds Measured at 175 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 1 3 7 0 0 0 11 NNE 2 3 3 0 0 0 8 NE 3 3 2 0 0 .0 8 ENE 2 3 0 0 0 0 5 E 1 4 3 0 0 0 8 ESE '2 1 0 0 0 0 3 SE 2 2 0 1 0 0 5 SSE 0 2 2 0 0 0 4 S 1 5 5 0 0 11 SSW 1 9 9 1 0 20 SW 2 14 6 0 0 22 WSW 2 15 6 0 0 23 W 7 16 8 0 0 31 WNW 2 29 18 0 0 49 4 12 7 0 0 23 NNW 1 3 3 0 0 7 Variable 0 0 0 0 0 Total 33 124 79 2 0 238 Hours of calm in this stability class: 1.

Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 1 Page 61

SITE: LIMERICK GENERATING STATION - UNITS 1 & 2 LICENSEE: EXELON GENERATION COMPANY, LLC Table D - 4 Wind Speed by Direction Measured at 175 Feet for Various Stability Classes for the Limerick Generating Station, April - June, 2008 Period of Record: April - June. 2008 Stability Class - Extremely Stable - l7lFt-26Ft Delta-T (F)

Winds Measured at 175 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 3 7 6 0 0 0 16 NNE 2 2 0 0 0 0 4 NE 3 2 1 0 0 0 6 ENE 6 3 1 0 0 0 10 E 4 5 0 0 0 0 9 ESE 2 1 0 0 0 0 3 SE 4 0 0 0 0 0 4 SSE 0 3 3 0 0 0 6 S 4 4 5 0 0 0 13 SSW 2 6 10 0 0 0 18 SW 4 14 10 0 0 0 28 WSW 6 13 9 0 0 0 28 W 5 18 2 0 0 0 25 WNW 6 24 22 0 0 0 52 NW 1 19 9 0 0 0 29 NNW 2 11 3 0 0 0 16 Variable 0 0 0 0 0 0 0

. Total 54 132 81 0 0 0 267 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stabi lity class: 0 Hours of missing stability measurements in all s tability classes: 1 Page 62

SITE: LIMERICK GENERATING STATION - UNITS 1 & 2 LICENSEE: EXELON GENERATION COMPANY, LLC Table D - 5 Wind Speed by Direction Measured at 30 Feet for Various Stability Classes for the Limerick Generating Station, July - September, 2008 Period of Record: July - September 2008 Stability Class - Extremely Unstable - 171Ft-26Ft Delta-T (F)

Winds Measured at 30 Feet Wind Speed (in mph)

Wind Directio: 1-3 4-7 8-12 13-18 19-24 > 24 Total 1 0 0 0 N 0 4 5 0 0 0 0 NNE 0 4 4 0 0 0 0 NE 0 0 0 0 0 0 0 ENE 0 0 0 0 0 0 0 E 0 .0 0 0 0 0 0 ESE 0 1 1 0 0 0 0 1 SE 0 1 0 0 0 0 1 SSE 0 1 5 0 0 0 S 0 0 5 0 0 0 0 SSW 0 5 5 14 1 0 0 0 SW 0 15 14 0 0 0 0 WSW 0 14 15 0 0 0 0 W 0 15 0 0 0 0 WNW 2 9 11 0 0 0 0 NW 0 7. 7 0 0 0 0 NNW 0 3 3 Variable 0 0 0 0 0 0 0 Total 2 78 7, 0 0 0 87 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 31 Page 63

SITE: LIMERICK GENERATING STATION - UNITS 1 & 2 LICENSEE: EXELON GENERATION COMPANY, LLC Table D - 5 Wind Speed by Direction Measured at 30 Feet for Various Stability Classes for the Limerick Generating Station, July - September, 2008 Period of Record: July - September 2008 Stability. Class - Moderately Unstable - 171Ft-26Ft Delta-T (F)

Winds Measured at 30 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 7 NNE 0 5 NE 0 2 ENE 0 0 E 0 1 ESE 0 0 SE 0 0 SSE 0 0 S 0 0 SSW 0 2 SW 0 9 WSW 4 9 0 0 0 0 13 W 2 7 0 0 0 0 9 WNW 2 6 2 0, 0 0 10 NW 0 11 3 0 0 0 14 NNW 0 4 4 0 0 0 8 Variable 0 0 0 0 0 0 0 Total 8 60 12. 0 0 0 80 Hours of calm in this stability class: 0 Hours of missing .wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 31 Page 64

SITE: LIMERICK GENERATING STATION - UNITS 1 & 2 LICENSEE: EXELON GENERATION COMPANY, LLC Table D - 5 Wind Speed by Direction Measured at 30 Feet for Various Stability Classes for the Limerick Generating Station, July - September, 2008 Period of Record: July - September 2008 Stability Class - Slightly Unstable - 171Ft-26Ft Delta-T (F)

Winds Measured at 30 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total 3 0 0 0 N 2 3 8 3 0 0 0 NNE 0 7 7 0 0 0 0 NE 0 4 4 0 0 0 0 ENE 1 5 6 2 0 0 0 E 0 7 9 0 0 0 0 ESE 0 2 2 0 0 0 0.

SE 0 1 1 0 0 0 0 SSE 0 2 2 1 0 0 0 S 0 3 4 1 1 0 0 0 SSW 1 3 1 4 0 0 0 SW 5 10 1 0 0 0 0 WSW 13 14 0 0 0 0 W 3 8 11 1 0 0 0 WNW 2 6 9 13 0 0 0 NW 1 10 24 NNW 0 5 11 2 0 0 18 Variable 0 0 0 0 0 0 0 Total 12 82 36 2 0 0 132 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 31 Page 65

SITE: LIMERICK GENERATING STATION - UNITS 1 & 2 LICENSEE: EXELON GENERATION COMPANY, LLC Table D - 5 Wind Speed by Direction Measured at 30 Feet for Various Stability Classes for the Limerick Generating Station, July - September, 2008 Period of Record: July - September 2008 Stability Class - Neutral - 171Ft-26Ft Delta-T (F)

Winds Measured at 30 Feet Wind Speed (in mph)

I Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 12 7 4 0 0 0 23 NNE 7 12 2 0 0 0 21 NE 10 11 3 0 0 0 24 ENE 7 13 7 0 0 0 27 E 5 17 2 0 0 0 24 ESE 2 19 1 0 0 0 22 SE 3 5 0 0 0 0 8 SSE 8 4 0 0 0 0 12 S 6 14 7 0 0 27 SSW 17 26 1 0 0 44 SW 16 31 0 0 48 WSW 20 27 4 0 0 51 W 19 11 0 0 0 30 WNW 18 24 0 0 0 42 NW 19 52 35. 1 0 107 15 31 22 0 0 68 Variable 0 0 0 0 0 0 Total 184 304 89 1 0 578 Hours of calm'in this stability class: 0 Hours of missing wind measurements in this stability class: 2 Hours of missing stability measurements in all stability classes: 31 Page 66

SITE: LIMERICK GENERATING STATION - UNITS 1 & 2 LICENSEE: EXELON GENERATION COMPANY, LLC Table D - 5 Wind Speed by Direction Measured at 30 Feet for Various Stability Classes for the Limerick Generating Station, July - September, 2008 Period of Record: July - September 2008 Stability Class - Slightly Stable - 171Ft-26Ft Delta-T (F)

Winds Measured at 30 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 32 13 46 NNE 26 25 52 NE 19 16 41 ENE 16 24 40 E 16 24 40 ESE 12 4 19 SE 9 4 13 SSE 14 12 26 S 12 46 60 SSW 23 16 49 SW 15 3 19 WSW 28 12 41 W 29 2 31 WNW 56 11 68 NN 69 32 105 NNV 24 17 44 Variable 0 0 0 Total 400 261 33 0 0 0 694 Hours of calm in this stability class: 9 Hours of missing wind measurements in this stability class: 1 Hours of missing stability measurements in all ,stability classes: 31 Page 67

SITE: LIMERICK GENERATING STATION - UNITS 1 & 2 LICENSEE: EXELON GENERATION COMPANY, LLC Table D - 5 Wind Speed by Direction Measured at 30 Feet for Various Stability Classes for the Limerick Generating Station, July - September, 2008 Period of Record: July - September 2008 Stability Class - Moderately Stable - 171Ft-26Ft Delta-T (F)

Winds Measured at 30 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total 0 0 0 0 N 25 0 25 0 0 0 0 NNE 10 3 13 0 0 0 0 NE 12 3 15 0 0 0 0 ENE 6 0 6 0 0 0 0 E 4 3 7 0 0 0 0 ESE 6 1 7 SE 0 0 0 0 0 0 0 SSE 0 0 0 0 4 1 5 S 0 0 0 0 3 2 5 SSW 0 0 0 0 10 7 17 SW 0 0 0 0 15 2 17 WSW 1 0 0 0 0 11 12.

W 1 0 0 0 0 24 25 WNW 0 0 0 0 58 4 62 WNW 0 0 0 0 48 8 56 0 0 0 0 NNW 31 0 31 0 0 0 0 Variable 0 0 0 Total 267 36 0 0 0 0 303 Hours of calm in this stability class: 18 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability cl asses: 31 Page 68

SITE: LIMERICK GENERATING STATION - UNITS 1 & 2 LICENSEE: EXELON GENERATION COMPANY, LLC Table D - 5 Wind Speed by Direction Measured at 30 Feet for Various Stability Classes for the Limerick Generating Station, July - September, 2008 Period of Record: July - SeptembEer 2008 Stability Class - Extremely Stable - 17 LFt-26Ft Delta-T (F)

Winds Measured at 30 Feet Wind Speed (in mph))

I Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 13 13 NNE 13 13 NE 9 9 ENE 10 10 E 7 7 ESE 2 2 SE 0 0 SSE 1 1 S 2 3 SSW 7 9 SW 14 17 WSW 12 12 W 16 16 WNW 47 47 NW 55 55 NNW 44 44 Variable 0 0 Total 252 6 0 0 0 0 258 Hours of calm in this stability class: 15 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 31 Page 69

SITE: LIMERICK GENERATING STATION - UNITS 1 & 2 LICENSEE: EXELON GENERATION COMPANY, LLC Table D - 6 Wind Speed by Direction Measured at 175 Feet for Various Stability Classes for the Limerick Generating Station, July - September,2008 Period of Record: July - September 2008 Stability Class - Extremely Unstable - 17lFt-26Ft Delta-T (F)

Winds Measured at 175 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 2 4 0 0 0 6 NNE 0 1 1 0 0 0 2 NE 0 0 0 0 0 0 0 ENE 0 0 0 0 0 0 0 E 0 0 0 0 0 0 0 ESE 0 0 1 0 0 0 1 SE 0 11 0 0 0 0 1 SSE 0 0 0 0 0 0 0 S 0 1 2 4 0 0 7 SSW 0 1 8 1 0 0 10 SW 0 1 10 1 0 0 12 WSW 0 3 13 3 0 0 19 W 0 2 11 0 0 0 13 WNW 0 8 4 0 0 0 12 NW 0 2 1 0 0 0 3 NNW 0 0 1 0 0 0 1 Variable 0 0 0 0 0 0 0 Total 0 22 56 9 0 0 87 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stabil ity class: 0 Hours of missing stability measurements .in all st ability classes: 31 Page 70

SITE: LIMERICK GENERATING STATION - UNITS 1 & 2 LICENSEE: EXELON GENERATION COMPANY, LLC Table D - 6 Wind Speed by Direction Measured at 175 Feet for Various Stability Classes for the Limerick Generating Station, July - September, 2008 Period of Record: July - September 2008 Stability Class - Moderately Unstable - 171Ft-26Ft Deita-T (F)

Winds Measured at 175' Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 2 4 0 6 NNE 0 5 0 0 5 NE 0 1 0 0 1 ENE 0 0 1 0 1 E 0 0 0 0 0 ESE 0 0 0 0 0 SE 0 0 0 0 0 SSE 0 0 0 0 0 S 0 0. 0 0 0 SSW 0 3 5 0 8 SW 0 4 2 0 7 WSW 0 11 5 0 0 0 16 W 0 6 3 1 0 0 10 WNW 0 5 7 2 1 0 15 NW 0 3 4 0 0 0 7 NNW 0 2 2 0 0 0 4 Variable 0 0 0 0 0 0 0 Total 0 42 33 4 1 0 80 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 31 Page 71

SITE: LIMERICK GENERATING STATION - UNITS 1 & 2 LICENSEE: EXELON GENERATION COMPANY, LLC Table D - 6 Wind Speed by Direction Measured at 175 Feet for Various Stability Classes for the Limerick Generating Station, July - September, 2008 Period of Record: July - September 2008 Stability Class - Slightly Unstable - 171Ft-26Ft Delta-T (F)

Winds Measured at 175 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 1 3 0 8 NNE 0 2 0 6 NE 0 3 0 6 ENE 0 1 0 5 E 0 3 0 8 ESE 0 1 0 2 SE 0 1 0 2 SSE 0 0 0 1 S 0 3 0 4 SSW 0 0 0 3 SW 0 5 0 13 WSW 0 6 7 1 0 0 14 W 2 8 5 0 0 0 15 WNW 1 6 ý6 3 0 0 16 NW 0 5 14 5 0 0 24 NNW 0 1 0 4 0 0 5 Variable 0 0 0 0 0 0 0 0 Total 4 48 60 20 0 132 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 31 Page 72

SITE: LIMERICK GENERATING STATION - UNITS 1 & 2 LICENSEE: EXELON GENERATION COMPANY, LLC Table D- 6 Wind.Speed by Direction Measured at 175 Feet. for Various Stability Classes for the Limerick Generating Station, July - September, 2008 Period of Record: July - September 2008 Stability Class - Neutral - 171Ft-26Ft Delta-T (F)

Winds Measured at 175 Feet

.Wind Speed (in mph)

Wind Direction 1-3. 4-7 8-12 13-18 19-24 > 24 Total N 9 3 10 2 0 24 NNE 7 8 8 0 0 23 NE 2 10 12 3 0 27 ENE 7 11 8 1 0 27 E 2 8 9 0 0 19 ESE 0 6 10 1 0 17 SE 3 6 6 0 0 15 SSE 3 11 4 0 0- 18 S 1 9 11 10 0 31 SSW 7 13 19 0 0 39 SW 8 26 22 8 0 64 WSW 9 16 25 0 0 50 W 5 20 12 0 0 37 WNW 14 33 29 9 0 86 NW 8 17 44 10 0 79 NNW 6 6 9 1 0 22 Variable 0 0 0 0 0 0 Total 91 203 238 45 1 0 578 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 2 Hours of missing stability measurements in all stability classes: 31 Page 73

SITE: LIMERICK GENERATING STATION - UNITS 1 & 2 LICENSEE: EXELON GENERATION COMPANY, LLC Table D - 6 Wind Speed by Direction Measured at 175 Feet for Various Stability Classes for the Limerick Generating Station, July - September, 2008 Period of Record: July - September 2008 Stability. Class - Slightly Stable - 171Ft-26Ft Delta-T (F)

Winds Measured at 175 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 14 15 16 1 0 0 46 NNE 10 14 20 2 0 0 46 NE 13 9 17 4 0 0 43 ENE 5 25 18 0 0 0 48 E 4 8 16 2 0 0, 30 ESE 11 5 7 1 0 0 24 SE 9 8 2 1 0 0 20

.SSE 2 17 13 0 0 0 32 S 1 16 42 8 0 0 67 SSW 7 15 10 5 2 0 39 SW 2 14 18 2 0 0 36 WSW 5 21 10 2 0 0 38 W 8 19 7 2 0 0 36 WNW 8 61 31 5 0 0 105 NW 20 27 15 2ý 0 0 64 NNW 11 15 2 0 0 0 28 Variable 0 0 0 0 0 0 0 Total 130 289 244 37 2 0 702 Hours of calm in this stability class: 1 Hours of missing wind measurements in this stability class: 1 Hours of missing stability measurements in all stability classes: 31 Page 74

SITE: LIMERICK GENERATING STATION - UNITS 1 & 2 LICENSEE: EXELON GENERATION COMPANY,-LLC Table D - 6 Wind Speed by Direction Measured at 175 Feet for Various Stability Classes for the Limerick Generating Station, July - September, 2008 Period of Record: July - September 2008 Stability Class - Moderately Stable - 171Ft-26Ft Delta-T (F)

Winds Measured at 175 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 6 8 0 0 0 0 14 NNE 6 4 4 0 0 0 14 NE 2 3 5 0 0 0 10 ENE 6 2 0 0 0 0 8 E 4 3 1 0 0 0 8 ESE 3 5 1 1 0 0 10 SE 3 3 0 0 0 0 6 SSE 3 3 0 0 0 0 6 S 2 6 5 0 0 0 13 SSW 1 8 7 3 0 0 19 SW 2 13 7 1 0 0 23 WSW 5 13 6 0 0 0 24 W 3 14 4 0 0 0 21 WNW 8 44 25 0 0 0 77 NW 10 32 8 0 0 0 50 8 9 0 0 0 0 17 Variable 0 0 0 0 0 0 0 Total 72 170 73 0 0 320 Hours of calm in this stability class: 1 Hours of missing wind measurements in this stability class: 0.

Hours of missing stability measurements in all stability classes: 31 Page 75

SITE: LIMERICK GENERATING STATION - UNITS 1 & 2 LICENSEE: EXELON GENERATION COMPANY, LLC Table D - 6 Wind Speed by Direction Measured at 175 Feet for Various Stability Classes for the Limerick Generating Station, July - September, 2008 Period of Record: July - September 2008 Stability Class - Extremely Stable - 17lFt-26Ft Delta-T (F)

Winds Measured at 175 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 4 4 0 0 0 0 8 NNE 2 4 1 0 0 0 7 NE 2 6 0 0 0 0 8 ENE 2 4 0 0 0 0 6 E 2 1 0 0 0 0 3 ESE 6 1 0 .0 0 0 7 SE 1 2 0 0 0 0 3 SSE 1 2 0 *0 0 0 3 S 2 1 0 0 0 4 SSW 5 11 1 0 0 25 SW 7 18 3 0 0 0 28 WSW 5 12 4 0 0 0 21

-W 6 15 0 0 0 0 21 WNW 9 51 20 1 0 0 81 NW 3 19 6 0 0 0 28 NNW 4 15 1 0 0 0 20 Variable 0 0 0 0 0 0 0 Total 61 166 44 2 0 0 273 Hours of calm in this stability class: 0 Hours o.f missing wind measurements in this stabil ity class: 0 Hours of missing stability measurements in all st ability cl asses: 31 Page 76

SITE: LIMERICK GENERATING STATION - UNITS 1 & 2 LICENSEE: EXELON GENERATION COMPANY, LLC Table D - 7 Wind Speed by Direction Measured at 30 Feet for Various Stability Classes for the Limerick Generating Station, October - December, 2008 Period of Record: October - December2008 Stability Class - Extremely Unstable - 17lFt-26Ft Delta-T (F)

Winds Measured at 30 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12. 13-18 19-24 > 24 Total N 0 NNE 1 NE 2 ENE 0 E 0 ESE 0 SE 0 SSE 0 S 5 SSW 1 SW 1 WSW 6 W 4 WNW 10 NW 4 NNW 0 Variable 0 Total 2- 19 12 1 0 0 34 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 5 Page ,77

SITE: LIMERICK GENERATING STATION - UNITS 1 & 2 LICENSEE: EXELON GENERATION COMPANY, LLC Table D - 7 Wind Speed by Direction Measured at 30 Feet for Various Stability Classes for the Limerick Generating Station, October - December, 2008 Period of Record: October - December2008 Stability Class - Moderately Unstable - 17lFt-26Ft Delta-T (F)

Winds Measured at 30 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 1 NNE 0 0 7 NE 0 0 0 ENE 0 0 1 E 1 0 1 ESE 0 0 0 SE 0 0 0 SSE 0 0 0 S 1 0 1 SSW 0 0 6 SW 2 0 3 WSW 1 0 3 W 0 0 11 WNW 0 3 6 6 0 0 15 NW 1 2 6 1 0 0 10 0 3 0 0 0 0 3 Variable 0 0 0 0 0 0 0 Total 6 27 22 7 0 0 62 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 5 Page 78

SITE: LIMERICK GENERATING STATION - UNITS 1 & 2 LICENSEE: EXELON GENERATION COMPANY, LLC Table D - 7 Wind Speed by Direction Measured at 30 Feet for Various Stability Classes for the Limerick Generating Station, October - December, 2008 Period of Record: October - December2008

.Stability Class - Slightly Unstable - 17iFt-26Ft Delta-T (F)

Winds Measured at 30 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 8 NNE 0 0 12 NE 1 0 3 ENE 1 0 1 E 0 0 0 ESE 0 0 0 SE 0 0 2 SSE 0 0 0 S 0 0 3 SSW 0 0 5 SW 1 0 1 WSW 1 0 2 W 4 7- 2 0 0 0 13 WNW 0 9 11 6 1 0 27 2 11 10 9 2 1 35 NNW 0 2 2 2 0 0 6 Variable 0 0 0 0 0 0 0 Total 10 54 33 17 3 1 118 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 5 Page 79

SITE: LIMERICK GENERATING STATION - UNITS 1 & 2 LICENSEE: EXELON GENERATION COMPANY, LLC Table D - 7 Wind Speed by Direction Measured at 30 Feet for Various Stability Classes for the Limerick Generating Station, October - December, 2008 Period of Record: October - December2008 Stability Class - Neutral - l7lFt-26Ft Delta-T (F)

Winds Measured at 30 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 14 28 11 0 0 0 53 NNE 9 38 17 0 0 0 64 NE 14 20 1 0 0 0 35 ENE 13 20 2 0 0 0 35 E 10 9 3 0 0 0 22 ESE 4 10 1 0 0 0 15 SE 9 3 3 0 0 0 15 17 4 0 0 0 26 SSE 5

'.S 9 24 3 0 0 0 36 SSW 12 15 11 3 0 0 41 SW 14 3 3 0 0 0 20 WSW 7 8 3 0 0 0 18 W 12 38 19 8 0 0 77 WNW 21 52 40 14 1 0 128 NW 17 46 91 44 10 1 209 NNW 11 15 7 9 0 0 42 Variable 0 0 0 0 0 0 0 Total 181 346 219 78 11 1 836 Hours of calm in this stability class: 1 Hours of missing wind measurements in this stabil ity class: 0 Hours of missing stability measurements in all st ability cl asses: 5 Page 80

SITE: LIMERICK GENERATING STATION - UNITS 1 &2 LICENSEE: EXELON GENERATION COMPANY, LLC Table D - 7 Wind Speed by Direction, Measured at 30 Feet for Various Stability Classes for the Limerick Generating Station, October - December, 2008 Period of Record: October - December2008 Stability.Class - Slightly Stable - 171Ft-26Ft Delta-T (F)

Winds Measured at 30 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 18 11 1 0 0 0 30 NNE 18 18 8 0 0 0 44 NE 8 8 5 0 0 0 21 ENE 17 15 2 0 0 0 34 E 3 9 2 0 0 0 14 ESE 4 5 3 0 0 0 12 SE 9 3 8 0 0 0 20 SSE 9 12 5 1 0 0 27 S 12 -26 13 3 0 0 54 SSW 16 20 9 0 0 0 45 SW 22 8 5 1 0 0 36 WSW 31 19 2 0 0 0 52 W 40 35 18 1 0 0 94 49 51 15 7 0 . 0 122 19 32 14 4 0 0 69 NNW 14 6 0 0 0 0 20 Variable 0 0 0 0 0 0 0 Total 289 278 110 17 0 0 694 Hours of calm in this stability class: 6 Hours of missing wind measurements in this stability class: 2 Hours of missing stability measurements in all stability classes: 5 Page 81

SITE: LIMERICK GENERATING STATION - UNITS 1 & 2 LICENSEE: EXELON GENERATION COMPANY, LLC, Table D - 7 Wind Speed by Direction Measured at 30 Feet for Various Stability Classes for the Limerick Generating Station, October - December, 2008 Period of Record: October - December2008 Stability Class - Moderately Stable - l7lFt-26Ft Delta-T (F)

Winds 'Measured at 30 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N ii 2 0 0 0 0 13 NNE 7 5 0 0 0 0 12 NE 3 0 0 0 0 0 3 ENE 5 0 0 0 0 0 5 E 1 1 0 0 0 0 2 ESE 6. 4 0 0 0 0 10 SE 2 1 0 0 0 0 3 SSE 3 1 0 0 0 0 4 S 3 3 0 0 0 0 6 SSW 4 8 0 0 0 0 12 SW 6 6 1 0 0 0 13 WSW 19 1 0 0 0 0 20 W 29 5 0. 0 0 0 34 WNW 36 6 0 0 0 0 42 NW 20 2 0 0 0. 0 22 NNW 14 0 0 -0 0 0 14 Variable 0 0 0 0 0 0 0 Total 169 45 1 0 0 0 215 Hours of calm in this stability class: 4 Hours of missing wind measurements in this stability class: 1 Hours of missing stability measurements in all stability classes: 5 Page 82

SITE: LIMERICK GENERATING STATION - UNITS 1 & 2 LICENSEE: EXELON GENERATION COMPANY, LLC Table D - 7 Wind Speed by Direction Measured at 30 Feet for Various Stability Classes for the Limerick Generating Station, October - December, 2008 Period of Record: October - December2008 Stability Class - Extremely Stable - l7lFt-26Ft Delta-T (F)

Winds Measured at 30 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total 21 0 0 0 0 0 N 21 10 0 0 0 0 0 NNE 10 12 0 0 0 0 0 NE 12 7 0 0 0 0 0 ENE 7 4 0 0 0 0 0 E 4 3 0 0 0 0 0 ESE 3 7 0 0 0 0 0 SE 7 SSE 3 1 0 0 0 0 4 S 4 0 0 0 0 0 4 SSW 6 0 0 0 0 0 6 SW 2 0 1 0 0 0 3 WSW 10 0 0 0 0 0 10 W 14 1 0 0 0 0 15 WNW 40 0 0 0 0 0 40 NW 40 0 0 0 0 0 40 NNW 26 0 0 .0 0 0 26 Variable 0 0 0 0 0 0 0 Total 209 2 1 0 0 o0 212 Hours of calm ift this stability class: 18 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 5 Page 83

SITE: LIMERICK GENERATING STATION - UNITS 1 & 2 LICENSEE: EXELON GENERATION COMPANY, LLC Table D - 8 Wind Speed by Direction Measured at 175 Feet for Various Stability Classes for the Limerick Generating Station, October - December, 2008 Period of Record: October - December2008 Stability Class - Extremely Unstable - 17lFt-26Ft Delta-T (F)

Winds Measured at 175 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 0 0 0 0 0 NNE 0 0 2 0 0 0 2 NE 0 0 1 0 0 0 1 ENE 0 0 0 0 0 0 0 E 0 0 0 0 0 0 0 ESE 0 0 0 0 0 0 0 SE 0 0 0 0 0 0 0 SSE 0 0 1 0 0 0 1 S 0, 0 2 0 4 SSW 0 0 1 0 1 SW 0 0 4 0 4 WSW 0 0 3 0 4 0 1 4 1 10 0 2 3 0 5 NW 0 1 0 0 2 NNW 0 0 0 0 0 Variable 0 0 0 0 0 Total 0 4 21 1 34 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stabi lity class: 0 Hours of missing stability measurements in all s tability cl asses: 5 Page 84

SITE: LIMERICK GENERATING STATION - UNITS 1 & 2 LICENSEE: EXELON GENERATION COMPANY, LLC Table D - 8 Wind. Speed by Direction Measured at 175 Feet for Various Stability Classes for the Limerick Generating Station, October - December, 2008 Period of Record: October - December2008 Stability Class - Moderately Unstable - 171Ft-26Ft Delta-T (F)

Winds Measured at 175 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 2 NNE 0 0 4 NE 0 0 1 ENE 0 0 0 E 0 0 0 ESE 1 0 1 SE 0 0 0 SSE 0 0 0 S 0 0 2 SSW 0 0 6 SW 1 0 3 WSW 0 0 7 0 2 4 1 3 0 10 0 1 4 4 3 3 15 NW 0 1 4 1 0 0 6 1 2 1 0 0 0 4 Variable 0 0 0 0 0 0 0 Total 3 13 25 11 6 3 61 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stabi lity class: 1 Hours of missing stability measurements in all s tability classes: 5 Page 85

SITE: LIMERICK GENERATING STATION - UNITS 1 & 2 LICENSEE: EXELON GENERATION COMPANY, LLC Table D - 8 Wind Speed by Direction Measured. at 175 Feet for Various Stability Classes for the Limerick Generating Station, October - December, 2008 Period of Record: October - December2008 Stability Class - Slightly Unstable - 171Ft-26Ft Delta-T (F)

Winds Measured at 175 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 1 0 6 NNE 0 3 0 6 NE 1 0 0 1 ENE 0 0 0 0 E 0 0 0 1 ESE 0 0 0 0 SE 0 0 0 2 "

SSE 0 0 0 0 S 0 1 0 3 SSW 0 3 0 4 SW 0 2 0 0 0 0 2 WSW 1 3 2 0 0 0 6 W 0 4 7 5 5 1 22 1 6 5 5 3 4 24 NW 1 2 4 13 2 3 25 NNW 0 3 0 2 1 0 6 Variable 0 0 0 0 0 0 0 Total 4 30 26 28 12 8 108 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class:. 10 Hours of missing stability measurements in all stability classes: 5 Page 86

SITE: LIMERICK GENERATING STATION - UNITS 1 & 2 LICENSEE: EXELON GENERATION COMPANY, LLC Table D - 8 Wind Speed by Direction Measured at 175 Feet for Various Stability Classes for the Limerick Generating Station, October - December, 2008 Period of Record: October - December2008 Stability Class - Neutral -17lFt-26Ft Delta-T (F)

Winds Measured at 175 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 8 17 15 4 0 0 44 NNE 7 20 28 14 0 0 69 NE 8 9 10 0 0 0 27 ENE 3 10 6 .0 0 0 19 E 4 8 8 0 0 0 20 ESE 4 6 2 .0 0 0 12 SE 2 8 0 2 1 0 13 SSE 1 11 13 3 0 0 28 S 1 15 30 1 1 0 48 SSW 4 16 6 9 7 2 44 SW 4 8 3 1 0 0 16 WSW 4 4 11 8 1 0 28 W 7 17 32 24 15 4 99 WNW 1 19 45 47 23 12 147 NW 5 15 35 47 19 11 132 NNW 4 15 6 14 1 0 40 Variable 0 0 0 0 0 0 0 Total 67 198 250 174 68 29 786 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 51 Hours of missing stability measurements in all stability classes: 5 Page 87

SITE: LIMERICK GENERATING STATION - UNITS 1 & 2 LICENSEE: EXELON GENERATION COMPANY, LLC Table D - 8 Wind Speed by Direction Measured at 175 Feet for Various Stability Classes for the Limerick Generating Station, October - December, 2008 Period of Record: October - December2008 Stability Class -Slightly Stable - l7lFt-26Ft Delta-T (F)

Winds Measured at 175 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 9 12 9 4 0 0 34 NNE 1 15 19 10 2 0 47 NE 8 5 4 1 0 0 18 ENE 7 11 13 1 0 0 32 E 3 3 16 1 0 0 23 ESE 3 2 4 3 0 0 12 SE 0 6 0 6 1 0 13 SSE 1 11 7 3 3 1 26 S 4 14 29 15 0 0 62 SSW 1 13 16 12 7 0 49 SW 6 22 18 4 1 1 52 WSW 4 16 30 3 2 0 55 W 4 14 34 17 10 2 81 WNW 4 45 59 14 7 7 136 NW 9 8 18 7 1 0 43 NNW 4 3 5 0 0 0 12 Variable 0 0 0 0 0 0 0 Total 68 200 281. 101 34 11 *695 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 7 Hours of missing stability measurements in all stability classes: 5 Page 88

SITE: LIMERICK GENERATING STATION - UNITS 1 & 2 LICENSEE: EXELON GENERATION COMPANY, LLC Table D - 8 Wind Speed by Direction Measured at 175 Feet for Various Stability Classes for the Limerick Generating Station, October - December, 2008 Period of Record: October - December2008 Stability Class - Moderately Stable - 171Ft-26Ft Delta-T (F)

Winds Measured at 175 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 5 2 2 1 0 0 10 NNE 0 4 6 1 0 0 11 NE 3 4 0 0 0 0 7 ENE 2 4 0 0 0 0 6 E 0 1 2 0 0 0 3 ESE 2 0 0 0 0 0 2 SE 1 1 1 0 0 0 3 SSE 0 3 2 0 0 0 5 S 0 6 4 0 0 0 10 SSW 1 2 7 1 0 0 11 SW 1 6 11 5 0 0 23 WSW 1 14 6 0 0 0 21 W 2 9 8 0 0 0 19 WNW 2 29 19 1 0 0 51 NW 3 10 11 1 0 0 25 NNW 9 4 0 0 0 0 13 Variable 0 0 0 0 0 0 0 Total 32 99 79 10 0 0 220 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 5 Page 89

SITE: LIMERICK GENERATING STATION - UNITS 1 & 2 LICENSEE: EXELON GENERATION COMPANY, LLC Table D - 8 Wind Speed by Direction Measured at 175 Feet for Various Stability Classes for the Limerick Generating Station, October - December, 2008 Period of Record: October - December2008 Stability Class - Extremely Stable - 171Ft-26Ft Delta-T (F)

Winds Measured at 175 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 6 8 1 0 15 NNE 2 1 0 0 3 NE 1 3 0 0 4 ENE 4 2 0 0 6 E 4 4 0 0 8 ESE 3 0 0 0 3 SE 7 2 0 0 9 SSE 1 5 2 0 8 S 4 5 3 0 12 SSW 4 4 2 0 11 SW 1 11 2 0 14 WSW 4 5 3 0 12 W 4 14 2 0 20 WNW 12 31 17 0 60 NW 5 20 6 0 31 NNW 4 8 1 0 13 Variable 0 0 0 0 0 Total 66 123 39 0 1 0 229 Hours of calm in this stability class: 1 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 5 Page 90

SITE: LIMERICK GENERATING STATION:- UNITS 1 & 2 LICENSEE: EXELON GENERATION COMPANY, LLC Table D - 9 Wind Speed by Direction Measured at 30 Feet for Various Stability Classes for the Limerick Generating Station, January - December, 2008 Limerick Tower 1 January-December, 2008 30 ft. Wind Speed and Direction l7lFt-26Ft Delta-T (F)

Number of Observations = 8476 Values are Percent Occurrence SPEED- --------------------- ------ WIND DIRECTION CLASSES -STABILITY

........ CLASSES-----------

CLASS N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL EU MU SU N SS MS ES TOTAL EU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0. 00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 MU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 C SU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0. 00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 A N 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 L SS 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 N MS 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 ES 0.00 0.00 0.00 0.00 0.00 0O00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 EU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.01 0.00 0.00 0.01 0.06 0.02 0.01 0.13 0.13 MU 0.00 0.01 0.01 0.00 0.01 0.00 0.00 0.00 0.02 0.00 0.02 0.06 0.06 0.02 0.05 0.01 0.28 0.28 1 SU 0.05 0.01 0.01 0.02 0.01 0.00 0.02 0.01 0.01 0.01 0.04 0.04 0.11 0.05 0.04 0.01 0.44 0.44

- N 0.55 0.54 0.74 0.71 0.39 0.22 0.25 0.32 0.27 0.48 0.46 0.54 0.53 0.80 0.73 0.50 8.05 8.05 3 SS 0.80 0.72 0.60 0.70 0.50 0.27 0.40 0.38 0.44 0.66 0.81 1.25 1.42 1.97 1.49 0.79 13.19 13.19 MS 0.68 0.27 0.38 0.27 0.15 0.27 0.12 0.17 0.15 0.27 0.53 0.64 1.10 1.70 1.31 0.84 8.85 8.85 ES 0.64 0.38 0.37 0.24 0.22 0.15 0.21 0.08 0.15 0.32 0.42 0.48 0.63 1.62 1.52 1.12 8.55 8.55 39.49 EU 0.07 0.05 0.02 0.00 0.02 0.05 0.01 0.05 0.14 0.21 0.22 0.37 0.21 0.28 0.26 0.09 2.06 2.06 MU 0.08 0.12 0.02 0.02 0.08 0.04 0.02 0.02 0.00 0.13 0.15 0.18 0.21 0.22 0.29 0.12 1.72 1.72 4 SU 0.14 0.19 0.08 0.08 0.21 0.11 0. 09 0.05 0.09 0.07 0.11 0.24 0.26 0.37 0.37 0.11 2.56 2.56 N 0.78 0.83 0.60 0.98 1.38 0.68 0.32 0.41 0.70 0.93 0.92 0.93 1.17 1.63 2.55 1.07 15.88 15.88 7 SS 0.68 0.76 0.40 0.74 0.88 0.2 8 0.31 0.57 1.45 0.79 0.37 0:64 1.01 1.84 1.75 0.57 13.04 13 .04 MS 0.04 0.12 0.04 0.00 0.09 0.08 0.02 0.07 0.24 0.26 0.14 0.04 0.09 0.19 0.17 0.05 1.63 1.63 ES 0.01 0.00 0.01 0.00 0.01 0.00 0.02 0.01 0.07 0.11 0.04 0.00 0.01 0.00 0.05 0.01 0.35 0.35 37.25 EU 0.12 0.05 0.02 0.02 0.01 0.04 0.00 0.02 0.14 0.13 0.05 0.01 0.14 0.22 0.22 0.22 1.43 1.43 NU 0.11 0.06 0.00 0.00 0.05 0.07 0.00 0.00 0.02 0.08 0.04 0.00 0.11 0.19 0.40 0.15 1.27 1.27 8 SU 0.12 0.06 0.00 0.04 0.13 0.06 0.00 0.01 0.02 0.08 0.08 0.01 0.11 0.27 0.59 0.22 1.81 1.81

- N 0.48 0.26 0.06 0.28 0.94 0.22 0.09 0.08 0.24 0.40 0.09 0.09 0.52 1.40 3 .32 1.14 9.64 9.64 1 SS 0.26 0.12 0.14 0.09 0.24 0.19 0.11 0.15 0.41 0.64 0.13 0.07 0.35 0.29 0.52 0.14 3.86 3.86 2 MS 0.00 0.00 0.00 0.00 0.00 0.01 0.01 0.00 0.00 0.00 0.01 0.00 0.00 0.00 0.00 0.01 0.05 0.05 ES 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.60 0.00 0.00 0.00 0.00 0.01 0.01 18.06 EU 0.00 0.00 0.00 0.00 0.02 0.02 0.00 0.00 0.00 0.00 0.00 0.00 0.04 0.08 0.08 0.01 0.26 0.26 1 MU 0.01 0.00 0.00 0.00 0.00 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.02 0.13 0.22 0.06 0.46 0.46 3 SU 0.00 0.00 0.00 0.00 0.05 0.00 0.00 0.00 0.00 0.01 0.00 0.00 0.02 0.11 0.35 0.08 0.63 0.63

- N 0.01 0.00 0.00 0.06 0.09 0.07 0.00 0.00 0.00 0.05 0.01 0.00 0.22 0.40 1.60 0.38 2-90 2.90 1 SS 0.00 0.00 0.00 0.04 0.00 0.00 0.00 0.04 0.04 0.01 0.04 0.01 0.06 0.11 0.09 0.01 0.44 0.44 8 MS 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00' 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 ES 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 4.68 Page 91

SITE: LIMERICK GENERATING STATION - UNITS 1 & 2 LICENSEE: EXELON GENERATION COMPANY, LLC Table D - 9 Wind Speed by Direction Measured at 30 Feet for Various Stability Qlasses for the Limerick Generating Station, January - December, 2008 Limerick Tower 1 January-December, 2008 30 ft. Wind Speed and Direction 171Ft-26Ft Delta-T (F)

SPEED WIND DIRECTION CLASSES STABILITY CLASSES --

CLASS N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL EU MU SU N SS MS ES TOTAL EU 0.00 0.00 0.00 0.00 0.00- 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 1 MU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.01 0.02 0.02 9 SU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.08 0.00 0.09 0.09

- N 0.00 0.00 0.00 0.00 0.00 0. 00 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.01 0.35 0.00 0.38 0.38 2 SS 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 4 MS 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 ES 0.00 0.00 0.00 0.00. 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.50 EU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 G MU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 T SU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.00 0.01 0.01 N 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.00 0.01 0.01 2 SS 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 4 MS 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 ES 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.02 TOT 5.64 4.53 3.52 4.29 5.51 2.86 2.02 2.44 4.62 5.66 4.70 5.59 8.42 13.98 18.46 7.75 100.00 3.88 3.76 5.53 36.86 30.52 10.52 8.92 100.00 Wind Direction by Stability N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL -STABILITY CLASSES-0.19 0.09 0.05 0.02 0.06 0.11 0.01 0.07 0.29 0.35 0.27 0.38 0.40 0.65 0.59 0.34 3.88 Extremely Unstable 0.20 0.19 0.04 0.02 0.14 0.12 0.02 0.02 0.05 0.21 0.21 0.24 0.40 0.57 0.98 0.35 3.76 Moderately Unstable 0.31 0.26 0.09 0.14 0.40 0.17 0.12 0.07 0.13 0.18 0.22 0.28 0.50 0.80 1.44 0.42 5.53 Slightly Unstable 1.83 i.63 1.40 2.03 2.81 1.20 0.66 0..81 1.20 1.86 1.49 1.57 2.45 4.25 8.57 3.09 36.86 Neutral 1,75 1.59 1.14 1.57 1.62 0.74 0.81 1.13 2.34 2.10 1.34 1.97 2.84 4.21 3.85 1.51 30.52 Slightly Stable 0.72 0.39 0.41 0.27 0.25 0.37 0.15 0.24 0.39 0.53 0.68 0.67 1.19 1.89 1.47 0.90 10.52 Moderately Stable 0.65 0.38 0.38 0.24 0.24 0.15 0.24 0.09 0.22 0.42 0.47 0.48 0.64 1.62 1.57 1.13 8.92 Extremely Stable Wind Direction by Wind Speed N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL -WIND SPEED CLASSES-0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 C A L M 2.73 1.93 2.11 1.93 1.29 0.92 1.00 0.96 1.06 1.76 2.29 3.01 3.85 6.22 5.16 3.28 39.49 < 3.5 mph 1.81 2.05 1.18 1.83 2.69 1.24 0.80 1.18 2.69 2.50 1.95 2.38 2.97 4.53 5.43 2.02 37.25 3.6 - 7.5 mph 1.09 0.54 0.22 0.44 1.37 0.59 0.21 0.27 0.84 1.33 0.41 0.19 1.23 2.38 5.05 1.90 18.06 7.6 - 12.5 mph 0.02 0.00 0.00 0.09 0.17 0.11 0.00 0.04 0.04 0.07 0.05 0.01 0.37 0.83 2.36 0.54 4.68 12.6 - 18.5 mph 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.02 0.45 0.01 0.50 18.6 - 24.5 mph 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.02 0.00 0.02 > 24.5 mph Page 92

SITE: LIMERICK GENERATING STATION - UNITS 1 & 2 LICENSEE: EXELON GENERATION COMPANY, LLC Table D - 10 Wind Speed by Direction Measured at 175 Feet for Various Stability Classes for the Limerick Generating Station, January - December, 2008 Limerick Tower 1 January-December,. 2008 175 ft. Wind Speed and Direction 171Ft-26Ft Delta-T (F)

Number of Observations = 8652 Values are Percent Occurrence SPEED WIND DIRECTION CLAASSES ---------------------------------- --------- STABILITY CLASSES-----------

CLASS N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL EU MU SU N SS MS ES TOTAL EU 0.00 0.00 0.00, 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 MU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 C SU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 A N 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 L SS 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 M MS 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 '0.00 0.00 0.00 0.00 0.00 0.00 0.00 ES 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 EU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.00 0.00 0.00 0.00 0.02 0.01 0.00 0.05 0.05 MU 0.00 0.00 0.00 0.00 0.00 0.01 0.00 0.00 0.00 0.00 0.01 0.00 0.02 0.00 0.02 0.01 0.08 0.08 1 SU 0.02 0.00 0.01 0.01 0.00 0.00 0.00 0.00 0.02 0.01 0.00 0.01 0.05 0.05 0.02 0.01 0.22 0.22

- N 0.28 0.36 0.29 0.24 0.20 0.09 0.14 0.08 0.09 0.16 0.17 0.24 0.25 0.25 0.31 0.18 3.35 3.35 3 SS 0.31 0.17 0.35 0.23 0.17 0.22 0.13 0.08 0.10 0.12 0.17 0.22 0.22 0.21 0.42 0.23 3.35 3.35 MS 0.17 0.13 0.13 0.15 0.08 0.10 0.08 0.10 0.05 0.09 0.09 0.09 0.17 0.16 0.21 0.25 2.07 2.07 ES 0.18 0.12 0.08 0.16 0.14 0.14 0.15 0.05 0.15 0.15 0.17 0.23 0.20 0.38 0.15 0.15 2.60 2.60 11.72 EU 0.02 0.01 0.02 0.01 0.01 0.01. 0.01 0.01 0.09 0.05 0.05 0.05 0.03 0.20 0.07 0.03 0.68 0.68 MU 0.05 0.08 0.02 0.01 0.01 0.01 0.01 0.01 0.01 0.08 0.08 0.20 0.14 0.14 0.07 0.09 1.02 1.02 4 SU 0.13 0.05 0.05 0.07 0.13 0.08 0.06 0.01 0.08 0.02 0.12 0.13 0.17 0.17 0.13 0.06 1.44 1.44

- ,.N 0.55 0.62 0.65 0.80 0.73 0.38 0.25 0.39 0.45 0.51 0.64 0.52 0.75 1.03 0.80 0.46 9.54 9.54 7 SS 0.53 0.51 0.32 0.76 0.45 0.23 0.36 0.39 0.59 0.54 0.73 0.74 0.81 1.91 0.65 0.39 9.92 9.92 MS 0.22 0.15 0.14 0.14 0.16 0.12 0.12 0.16 0.29 0.30 0.44 0.57 0.54 1.29 0.77 0.25 5.66 5.66 ES 0.29 0.15 0.16 0.13 0.12 0.03 0.07 0.12 0.16 0.30 0.53 0.44 0.60 1.29 0.72 0.42 5.52 5.52 33.78 EU 0.14 0.06 0.01 0.00 0.01 0.03 0.00 0.06 0.16 0.23 0.21 0.24 0.25 0.25 0.12 0.09 1.87 1.87 MU 0.12 0.01 0.00 0.01 0.10 0.06 0.03 0.01 0.02 0.16' 0 05 0.14 0.12 0.31 0.20 0.09 1.43 1.43 8 SU 0.09 0.09 0.03 0.10 0.12 0.07 0.03 0.03 0:01 0.07 0.09 0.17 0.23 0.29 0.29 0.03 -1.77 1.77

- N 0.57 0.52 0.38 0.82 1.04 0.40 0.28 0.31 0.74 0.64 0.69 0.76 1.01 1.76 .1.69 0.77 12.38 12.38 1 SS 0.71 0.58 0.34 0.57 0.77 0.24 0.18 0.42 1.43 0.58 0.74 0.81 1.18 2.21 1.12 0.37. 12.24 12.24 2 MS 0.12 0.20 0.08 0.00 0.09 0.01 0.01 0.06 0.20 0.34 0.32 0.23 0.29 0.77 0.35 0.07 3: 13 3.13 ES 0.08 0.02 0.01 0.01 0.00 0.00 0.01 0.06 0.10 0.23 0.20 0.21 0.05 0.69 0.27 0.07 2.01 2.01 34.84 EU 0.02 0.00 0.00 0.05 0.02 0.01 0.00 0.01 0.09 0.09 0.01 0.14 0.15 0.14 0.07 0.12 0.92 0.92 1 MU 0.02 0.03 0.00 0.00 0.01 0.01 0.00 0.00 0.02 0.03 0.02 0.02 0.10 0.23 0.10 0.06 0.68 0.68 3 SU 0.02 0.01 0.00 0.01 0.09 0.01 0.00 0.01 0.02 0.07 0.03 0.06 0.12 0.27 0.36 0.10 1.19 1.19

- N 0.21 0.20 0.05 0.21 0.46 0.08 0.06 0.07 0.29 0.31 0.18 0.28 0.86 1.87 1.62 0.64 7.37 7.37 1 SS 0.20 0.17 0.08 0.06 0.20 0.13 0.13 0.15 .0.60 0.49 0.13 0.13 0.47 0.47 0.25 0.07 3.72 3.72 8 MS 0.01 0.01 0.00 0.00 0.00 0.01 0.01 0.01 0.00 0.06 0.08 0.02 0.00 0.01 0.01 0.00 0.24 0.24 ES 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.00 0.01 0.00 0.00 0.00 0.01 0.00 0.00 0.03 0.03 14.17 Page 93

SITE: LIMERICK GENERATING STATION - UNITS 1 & 2 LICENSEE: EXELON GENERATION COMPANY, LLC Table D - 10 Wind Speed by Direction Measured at 175 Feet for Various Stability Classes for the Limerick Generating Station, January - December, 2008 Limerick Tower 1 January-December, 2008 175 ft. Wind Speed and Direction l7lFt-26Ft Delta-T (F)

SPEED WIND DIRECTION CLASSES STABILITY CLASSES----------- ------

CLASS N NNE NE- ENE E ESE SE SSE SSW - SW WSW W WNW NW NNW TOTAL EU MU SU " N SS MS ES TOTAL EU 0.00 0.00 .0.00 0.00 0.00 0.02 0.00 0.00 0.00 0.01 0.00 0.02 0.07 0.07 0.02 0.00 0.22 0.22 1 MU 0.00 0.00 0.00 0.00 0.00 0.01 0.00 0.00 0.00 0.00 0.01 0.01 0.10 0.15 0.09 0.00 0.38 0.38 9 SU 0.00 0.00 0.00 0.00 0.01 0.00 0.00 0.00 0.00 0.03 0.02 0.01 0.14 0.16 0.12 0.02 0.52 0.52

- N 0.00 0.00 0.06 0.00 0.07 0.02 0.01 0.00 0.01 0.14 0.00 0.01 0.46 0.79 2.20 0.53 0.09 2.20 2 SS 0.00 0.02 0.01 0.02 0.00 0.00 0.01 0.05 0.09 0.22 0.07 0.07 0.14 0.08 0.02 0.00 0.81 0.81 4 MS 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 ES 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.00 0.00 0.00 0.00 0.00 0.00 '0.01 0.01 4.14 EU 0.00. 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.05 0.00 0:00 0.00 0.06 0.06 G MU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.06 0.01 0.00 0.08 0.08 T SU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.03 0.07 0.07 0.00 0.17 0.17 N 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.02 0.00 0.01 0.18 0.37 0.21 0.00 0.80 0.80 2 SS 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.02 0.00 0.01 0.03 0.02 0.02 0.13 0.00 0.00 0.24 0.24 4 MS 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 ES 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 1.35 TOT 5.06 4.28 3.27- 4.58 5.20 2.57 2.15 2.69 5.91 6.09 6.10 6.82 10.00 18.27 11.86 5.15 100.00 3.80 3.68 5.32 35.63 30.28 11.11 10.18 100.00 Wind Direction by Stability N NNE NE ENE , E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL -STABILITY CLASSES-0.18 0.07 0.03 0.06 0.05 0.08 0.01 0.08 0.36 0.38 0.27 0.46 0.55 0.68 0.29 0.24 3.80 Extremely Unstable 0.18 0.13 0.02 0.02 0.13 0.10 0.05., 0.02 0.06 0.28 0.17 0.37 0.50 0.89 0.50 0.25" 3.68 Moderately.Unstable 0.27 0.15 0.09 0.20 0.35 0.16 0.09 0.06 0.14 0.21 0.27 0.38 0.74 1.01 0.98 0.23 5.32 :Slightly Unstable 1.61 1.70 1.42 2.07 2.50 0.98 0.74 0.86 1.58 1.78 1.69 1.83 3.51 6.07 5.15 2.15 35.63 Neutral 1.75 1.46 1.10 1.64 1.60 0.82 0.81 1.11 2.82 1.95 1.87 '1.99 2.84 5.00 2.46 1.06 30.28 Slightly Stable 0.52 0.49 0.35 0.29 0.34 0.24 0.22 0.34 0.53 0.79 0.94 0.91 1.01 2.24 1.34 0.58 11.11 Moderately Stable 0.55 0.29 0.25 0.30 0.25 0.17 0.23 0.23 0.42 0.71 0.90 0.88 0.84 2.38 1.13 0.64 10.18 Extremely Stable Wind Direction by Wind Speed N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL -WIND SPEED CLASSES-0.00 0.00 0.00 0.00 0.00 0.00 0.-00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 C A L M 0.97 .0.77 0.86 0.80 0.59 0.57 0.50 0.31 0.43 0.53 0.62 0.80 0.91 1.07 1.14 0.84 11.72 < 3.5 mph 1.79 1.57 1.36 1.92 1.61 0.87 0.88 1.10 1.68 1.80 2.58 2.64 3.05 6.03 3.20 1.71 33.78 3.6 - 7.5 mph 1.81 1.48 0.86 1.51 2.14 0.82 0.55 0.95 2.67 2.24 2.30 2.57 3.12 6.29 4.02 1.50 34.84 7.6 - 12.5 mph 0.49 0.43 0.13 0.32 0.79 0.25 0.20 0.27 1.03 1.06 0.46 0.65 1.70 3.01 2.42 0.98 14.17 12.6 - 18.5 mph 0.00 0.02 0.07 0.02 0.08 0.06 0.02 0o05 0.10 0.42 0.10 0.13 0.91 1.25 0.79 0.12 4.14 18.6 - 24.5 mph 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.02 -0.00 0.03 0.03 0.05 0.30 0.62 0.29 0.00 1.35 > 24.5 mph Page 94

SITE: LIMERICK GENERATING STATION - UNITS 1 & 2 LICENSEE: EXELON GENERATION COMPANY, LLC Table D- 11 Annual x/Q, x/Q depleted and D/Q values for the North Stack, Limerick Generating Station, 2008 Limerick Generating Station x/Q, x/Q depleted and D/Q values North Stack - Flow = 251200 cfm X/Q (s/mA3) X/Q (s/mA2)

Stack ID Location Direction Range (m) Undepleted Depleted No Decay 8.05d Decay D/Q (1/mA2)

N Site Boundary N 884 2.OOE-07 1.82E-07 1.67E-09 N Inhalation N 965 1.78E-07 1.61 E-07 1.47E-09 N Vegetatioh N 2574 6.37E-08 5.69E-08 3.69E-1 0 N Meat N 3414 5.52E-08 5.OOE-08 2.47E-1 0 N Cow N 7562 3.40E-08 3.13E-08 7.04E-1 1 N RR-Inf-Lck-NG NNE 682 3.35E-07 3.09E-07 3.30E-09 N Site Boundary NNE 793 2.71 E-07 2.48E-07 2.67E-09 N Inhalation NNE 805 2.65E-07 2.43E-07 2.61 E-09 N Vegetation NNE 805 2.65E-07 2.43E-07 2.61 E-09 N Meat NNE 1585 1.09E-07 9.67E-08 1.06E-09 N Site Boundary NE 793 1.67E-07 1.53E-07 1.57E-09 N Meat NE 1097 1.08E-07 9.71 E-08 1.05E-09 N Inhalation NE 1287 8.73E-08 7.84E-08 8.75E-10 N Vegetation NE 2414 5.12E-08 4.62E-08 3.97E-10 N Site Boundary ENE 793 1.71 E-07 1.57E-07 1.54E-09 N Inhalation ENE 965 1.32E-07 1.20E-07 1.22E-09 N Vegetation ENE 2896 5.62E-08 5.18E-08 3.35E-10 N Meat ENE 3871 5.47E-08 5.11 E-08 2.34E-10 N Site Boundary E 762 3.56E-07 3.26E-07 3.75E-09 N Inhalation E 965 2.58E-07 2.34E-07 2.68E-09 N Vegetation E 1770 1.23E-07 1.09E-07 1.19E-09 N Meat E 1890 1.16E-07 1.03E-07 1.08E-09 N Site Boundary ESE 762 6.23E-07 5.71 E-07 6.70E-09 N Inhalation ESE 805 5.78E-07 5.28E-07 6.18E-09 N RR-Inf-Lck-NG ESE 884 5.07E-07 4.61 E-07 5.38E-09 N Cow ESE 1770 2.1OE-07 1.86E-07 2.02E-09 N Goat ESE 1770 2.1OE-07 1.86E-07 2.02E-09 N Vegetation ESE 1931 1.93E-07 1.72E'07 1.78E-09 N Meat ESE 4511 1.26E-07 1.16E-07 5.11E-10 N Site Boundary SE 762 1.13E-06 1.04E-06 1.47E-08 N Inhalation SE 1609 4.08E-07 3.61 E-07 4.81 E-09 N Vegetation SE 1770 3.64E-07 3.22E-07 ,4.16E-09 N Meat SE 7241 1.11E-07 9.91 E-08 4.54E-10 N Site Boundary SSE 1006 2.36E-07 2.13E-07 2.84E-09 N Inhalation SSE 1609 1.29E-07 1.14E-07 1.49E-09 N Vegetation SSE 1931 1.06E-07 9.43E-08 1.15E-09 N Meat SSE 7224 4.87E-08 4.48E-08 1.58E-1 0 N Cow SSE 7562 4.73E-08 4.35E-08 1.46E-10 N RR-Inf-Lck-NG S 300 8.74E-07 8.37E-07 7.22E-09 Page 95

SITE: LIMERICK GENERATING STATION - UNITS 1 & 2 LICENSEE: EXELON GENERATION COMPANY, LLC Table D - 11 Annual x/Q, x/Q depleted and D/Q values for the North Stack, Limerick Generating Station, 2008 Limerick Generating Station x/Q, x/Q depleted and D/Q values North Stack - Flow = 251200 cfm X/Q (s/mA3) X/Q (s/mA2)

Stack ID Location Direction Range (m) Undepleted Depleted 4 4 No Decay 4 8.05d Decay 4 D/Q (limA2)

Site Boundary S 762 2.OOE-07 1.83E-07 1.96E-0S Inhalation S 1287 1.OOE-07 8.95E-08 1.OOE-09 Vegetation S 1931 6.62E-08 5.91 E-08 6.17E-1C Meat S 3018 5.36E-08 4.89E-08 3.47E-1C Cow S 3701 5.06E-08 4.67E-08 2.65E-1 C RR-Inf-Lck-NG SSW 225 1.36E-06 1.31 E-06 8.56E-0S Site Boundary SSW 762 1.80E-07 1.65E-07 1.52E-0S Meat SSW 1433 7.85E-08 7.OOE-08 7.07E-1C Inhalation SSW 1609 6.93E-08 6.17E-08 6.19E-1C Vegetation SSW 2253 5.41 E-08 4.85E-08 4.07E-1 C Cow SSW 2896 4.93E-08 4.49E-08 2.96E-1C RR-Inf-Lck-NG SW 225 8.32E-07 8.03E-07 4.15 E-OS Site Boundary SW 884 8.80E-08 7.99E-08 6.21 E-1 C Inhalation SW 965 7.80E-08 7.05E-08 5.59E-1C Vegetation SW 965 7.80E-08 7.05E-08 5.59E-1C Meat SW 2835 3.30E-08 3.03E-08 1.86E-1C Cow SW 4827 3.22E-08 3.03E-08 9.56E-1 1 RR-Inf-Lck-NG WSW 345 5.94E-07 5.66E-07 4.40E-0S RR-Inf-Lck-NG WSW 450 3.72E-07 3.51 E-07 2.98E-09 Site Boundary WSW 854 1.45E-07 1.32E-07 1.17E-09 Inhalation wSW 1287 8.36E-08 7.45E-08 7.16E-1C Vegetation WSW 1287 8.36E-08 7.45E-08 7.16E-1C Meat WSW 2134 5.32E-08 4.77E-08 4.1OE-1C Cow WSW 4505 4.47E-08 4.17E-08 1.60E-1C RR-Inf-Lck-NG W 225 2.19E-06 2.11 E-06 1.75E-08 Site Boundary W 854 2.53E-07 2.30E-07 2.55E-09 Inhalation W 965 2.14E-07 1.94E-07 2.14E-09 Vegetation W 3540 6.21 E-08 5.61 E-08 3.93E-10 Meat W 4084 5.69E-08 5.16E-08 3.21 E-10 RR-Inf-Lck-NG WNW 345 4.56E-07 4.34E-07 4.22E-09 Site Boundary WNW 793 1.24E-07 1.14E-07 1.32E-09 Inhalation WNW 1126 7.67E-08 6.90E-08 8.17E-10 Vegetation WNW 1126 7.67E-08 6.90E-08 8.17E-10 RR-Inf-Lck-NG NW 450 1.76E-07 1.66E-07 1.30E-09 Site Boundary NW 762 7.97E-08 7.32E-08 6.20E- 10 Inhalation NW 2092 2.52E-08 2.25E-08 1.80E-10 Vegetation NW 2574 2.30E-08 2.08E-08 1.38E-10 Meat NW 6660 1.70E-08 1.59E-08 3.63E-1 1 Site Boundary NNW 884 8.91 E-08 8.11 E-08 7.24E-1 0 Inhalation NNW 1448 4.65E-08 4.13E-08 3.83E-10 Vegetation NNW 1931 3.53E-08 3.14E-08 2.60E-10 Meat NNW 6325 2.24E-08 2.09E-08 4.73E-1 1 Page 96

SITE: LIMERICK GENERATING STATION - UNITS 1 & 2 LICENSEE: EXELON GENERATION COMPANY, LLC Table D - 12 Annual x/Q, x/Q depleted and D/Q values for the South Stack, Limerick Generating Station, 2008 Limerick Generating Station x/Q, x/Q depleted and D/Q values South Stack - Flow = 177200 cfm X/Q (s/mA3) X/Q (s/mA2)

Stack ID Location Direction Range (m) Undepleted Depleted

+

No Decay m 8.05d Decay D/Q (1/mA2)

W I f Site Boundary N 884 6.80E-08 6.23E-08 8.23E-10 Inhalation N 965 6.1 OE-08 5.56E-08 7.45E-10 Vegetation N .2574 3.54E-08 3.31 E-08 2.48E-1 0 Meat N 3414 3.69E-08 3.51 E-08 1.76E-10 Cow N 7562 2.93E-08 2.80E-08 5.51 E-1 1 RR-Inf-Lck-NG NNE .682 1.1OE-07 1.02E-07 .1.58E-09 Site Boundary NNE 793 9.03E-08 8.33E-08 1.33E-09 Inhalation NNE 805 8.86E-08 8.17E-08 1.31 E-09 Vegetation NNE 805 8.86E-08 8.17E-08 1.31 E-09 Meat NNE 1585 4.32E-08 3.94E-08 6.78E-1 0 Site Boundary NE 793 4.37E-08 4.07E-08 8.76E-1 0 Meat NE 1097 3.1 OE-08 2.86E-08 6.61 E-10 Inhalation. NE 1287 2.70E-08 2.49E-08 5.86E-1 0 Vegetation NE 2414 2.65E-08 2.51 E-08 3.1OE-10 Site Boundary ENE 793 4.61 E-08 4.29E-08 9.16E-10 Inhalation ENE 965 3.81 E-08 3.53E-08 7.79E-1 0 Vegetation ENE 2896 3.59E-08 3.46E-08 2.81 E-10 Meat ENE 3871 4.11 E-08 3.98E-08 2.04E-1 0 Site Boundary E 762 1.15E-07 1.06E-07 1.76E-09 Inhalation E 965 8.65E-08 7.90E-08 1.36E-09 Vegetation E 1770 5.39E-08 4.96E-08 7.75E-1 0 Meat E 1890 5.36E-08 4.94E-08 7.20E-10 Site Boundary ESE 762 1.92E-07 1.77E-07 2.95E-09 Inhalation ESE 805 1.79E-07 1.65E-07 2.77E-09 RR-Inf-Lck-NG ESE 884 1.60E-07 1.46E-07 2.48E-09 Cow ESE 1770 8.92E-08 8.18E-08 1.25E-09 Goat ESE 1770 8.92E-08 8.18E-08 1.25E-09 Vegetation ESE 1931 8.81 E-08 8.13E-08 1.13E-09 Meat ESE 4511 9.80E-08 9.39E-08 4.04E-1 0 Site Boundary SE 762 4.09E-07 3.76E-07 6.69E-09 Inhalation SE 1609 1.84E-07 1.67E-07 2.88E-09 Vegetation SE 1770 1.73E-07 1.58E-07 2.57E-09 Meat SE 7241 9.56E-08 8.95E-08 3.89E-1 0 Site Boundary SSE 1006 8.78E-08 8.OOE-08 1.41 E-09 Inhalation SSE 1609 5.83E-08 5.33E-08 9.37E-1 0 Vegetation SSE 1931 5.42E-08 4.99E-08 7.68E-10 Meat SSE 7224 4.28E-08 4.06E-08 1.39E-10 Cow SSE 7562 4.19E-08 3.97E-08 1.29E-10 Page 97

SITE: LIMERICK GENERATING STATION - UNITS 1 & 2 LICENSEE: EXELON GENERATION COMPANY, LLC Table D - 12 Annual x/Q, x/Q depleted and D/Q values for the South Stack, Limerick Generating Station, 2008 Limerick Generating Station x/Q, x/Q depleted and D/Q values South Stack - Flow = 177200 cfm X/Q (s/mA3) X/Q (s/mA2)

Stack ID Location Direction Range (m) Undepleted Depleted I No Decav + 8.05d Decav DIQ (IimA2)

RR-Inf-Lck-NG S 300 2.98E-07 2.85E-07 2.94E-O0 Site Boundary S 762 7.22E-08 6.66E-08 9.90E-1 C Inhalation S 1287 4.07E-08 3.70E-08 6.27E-1C Vegetation S 1931 3.38E-08 3.12E-08 4.51 E-1 C Meat S 3018 3.68E-08 3.50E-08 2.82E-1C Cow S 3701 3.83E-08 3.66E-08 2.23E-1C RR-Inf-Lck-NG SSW 225 4.19E-07 4.04E-07 3.1 0E-O0 Site Boundary SSW 762 5.86E-08 5.39E-08 7.OOE-1 C Meat SSW 1433 2.95E-08 2.67E-08 4.43E-1C Inhalation SSW 1609 2.78E-08 2.53E-08 4.08E-1C Vegetation SSW 2253 2.84E-08 2.66E-08 2.97E-1C Cow SSW 2896 3.15E-08 2.99E-08 2.29E- 10 RR-Inf-Lck-NG SW 225 1.97E-07 1.90E-07 1.34E-09 Site Boundary SW 884 2.22E-08 2.02E-08 2.81 E-10 Inhalation SW 965 1.99E-08 1.81 E-08 2.67E-1 0 Vegetation SW 965 1.99E-08 1.81 E-08 2.67E-1 0 Meat SW 2835 1.98E-08 1.90E-08 1.47E-10 Cow SW 4827 2.57E-08 2.49E-08 8.19E-1 1 RR-Inf-Lck-NG WSW 345 1.63E-07 1.56E-07 1.52E-09 RR-Inf-Lck-NG WSW 450 1.02E-07 9.65E-08 1.06E-09 Site Boundary WSW 854 4.11 E-08 3.75E-08 4.90E-10 Inhalation WSW 1287 2.56E-08 2.31 E-08 3.89E-1 0 Vegetation WSW 1287 2.56E-08 2.31 E-08 3.89E-10 Meat WSW 2134 2.50E-08 2.34E-08 2.88E-1 0 Cow WSW 4505 3.53E-08 3.41 E-08 1.34E-10 RR-Inf-Lck-NG W 225 7.61 E-07 7.35E-07 6.46E-09 Site Boundary W 854 9.23E-08 8.44E-08 1.17E-09 Inhalation W 965 7.95E-08 7.22E-08 1.03E-09 Vegetation W 3540 4.51 E-08 4.26E-08 3.18E-10 Meat W 4084 4.36E-08 4.12E-08 2.67E-1 0 RR-Inf-Lck-NG WNW 345 1.47E-07 1.40E-07 1.81 E-09 site Boundary WNW 793 4.35E-08 4.01 E-08 7.11E-10 Site Boundary NNW 884 2.96E-08 2.70E-08 3.50E-10 Inhalation WNW 1126 2.91 E-08 2.65E-08 4.96E-10 Vegetation WNW 1126 2.91 E-08 2.65E-08 4.96E-10 Inhalation NNW 1448 1.70E-08 1.53E-08 2.28E-1 0 Vegetation NNW 1931 1.57E-08 1.44E-08 1.70E-10 Meat NNW 6325 1.90E-08 1.83E-08 3.84E-1 1 RR-Inf-Lck-NG NW 450 4.83E-08 4.55E-08 5.20E-10 Site Boundary NW 762 2.35E-08 2.17E-08 2.83E-10 Inhalation NW 2092 1.17E-08 1.09E-08 1.27E-10 Vegetation NW 2574 1.29E-08 1.22E-08 1.02 E-10 Meat NW 6660 1.45E-08 1.40E-08 3.09E-1 1 Page 98