ML12130A129

ACE - Annual Radioactive Effluent Release Report 2011

ML12130A129
Person / Time
Site:	Limerick
Issue date:	05/09/2012
From:	Exelon Generation Co, Exelon Nuclear
To:	NRC Region 1
KROHN, PG
References
Download: ML12130A129 (116)

Text

Annual Radioactive Effluent Release Report No. 37 2011 Limerick Generating Station

SITE: LIMERICK GENERATING STATION - UNITS 1 & 2 LICENSEE: EXELON GENERATION COMPANY, LLC ANNUAL RADIOACTIVE EFFLUENT RELEASE REPORT NO. 37 January 1, 2011 through December 31, 2011 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)

SITE: LIMERICK GENERATING STATION - UNITS 1 & 2 LICENSEE: EXELON GENERATION COMPANY, LLC (Page Intentionally Left Blank)

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 ( E ) 2 D Measurements and Approximations of Total Radioactivity 2 E Batch Releases 4 F Abnormal Releases 5 G Spills 5 H Revisions to the ODCM 5 I Radioactive Effluent Monitoring Instrumentation Out of Service for More Than 30 Days 5 J Independent Spent Fuel Storage Installation (ISFSI) 5 K Significant Events 6

3. Radiological Impact to Man and Compliance to 40 CFR 190 Limits 6 A Dose to Members of the Public at or Beyond Site Boundary 6 B Dose to Members of the Public Inside the Site Boundary 7 Appendix A - Effluent and Waste Disposal Summary 9 Appendix B - Solid Waste and Irradiated Fuel Shipments 19 Appendix C - ERRATA Data from Previous Reports 23 Appendix D - Meteorological Data 43 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, 2011 through December 31, 2011. 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 2011 report is complete.

2. Supplemental Information A. Regulatory Limits Limit Units Receptor ODCM and 10 CFR 50, Appendix I 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 air dose 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. Iodines, 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. 10 times the concentration limits in 10 CFR 20, ODCM Control 3.2.1.1 Appendix B, Table 2 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. 40 CFR 190, 10 CFR 72.104

< 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 3.2.2.1.a and 3.2.2.1.b as 500 mrem/yr (Total Body),

3000 mrem/yr (Skin) and 1500 mr/yr (Organ).

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 µCi/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 ( E ) 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," may be 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 monitors 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 Iodines 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 Page 2

SITE: LIMERICK GENERATING STATION - UNITS 1 & 2 LICENSEE: EXELON GENERATION COMPANY, LLC 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 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. Carbon-14 in gaseous effluents Gaseous releases of Carbon-14 were estimated based upon a study by EPRI (EPRI 1021106, Estimation of Carbon-14 in Nuclear Power Plant Gaseous Effluents). The principal production reaction leading to the release of C-14 during plant operation is the O-17(n,) C-14 nuclear reaction in reactor coolant. Carbon-14 is also produced by neutron activation of N-14 in the BWR drywell and dissolved nitrogen in the reactor coolant, however these sources are a small fraction of that produced by the O-17(n,)

C-14 reaction and can be neglected since reactor coolant normally contains less than 0.1 ppm by weight nitrogen and the neutron flux in the drywell is low. Most of the C-14 produced in a BWR is released in a gaseous form by the off-gas system, primarily in 14 the form of CO2.

An Exelon Fleet-Wide spreadsheet was developed using the production factors from the EPRI report. The spreadsheet requires site specific inputs of total reactor power ratings (7030) MWth and Equivalent Full Power Operation (350) days. Using this method, total C-14 production was estimated at 34.04 Curies (Ci). Nintey-five percent 14 or 32.33 Ci was in the form of CO2, which was the chemical form necessary to be incorporated in the dose pathways of vegetation, meat and milk. Only inhalation pathway uses the full C-14 production value in estimating dose.

To simplify the dose calculations for C-14, the total production value was used in calculating dose via the offsite effluent pathways. Using the total production C-14 production value, results in a conservative five percent overestimation of dose via the vegetation, meat and milk pathways. In addition, releases of C-14 were assumed to occur only through the North Vent, which is common to both units. The North Vent has the most conservative X/Q factors for calculating dose.

4. 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 quarter was then determined by summing the activity content of all batch releases discharged during the quarter.

5. 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. The monthly liquid radwaste composite was analyzed for tritium using a Liquid Scintillation Counter.

6. 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.

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SITE: LIMERICK GENERATING STATION - UNITS 1 & 2 LICENSEE: EXELON GENERATION COMPANY, LLC The ODCM required lower limit of detection for airborne and liquid releases as follows:

Airborne: LLD Gross Alpha, Sr-89, Sr-90 1E-11 uCi/cc H-3 1E-06 uCi/cc I-131 1E-12 uCi/cc I-133 1E-10 uCi/cc Principal Gamma Emitters (Mn-54, Fe-59, Co-58, Co-60, Zn-65, Mo-99, 1E-11 uCi/cc I-131, Cs-134, Cs-137,Ce-141, Ce-144)

Noble Gas (Kr-87, Kr-88, Xe-133, Xe-133m, Xe-135, Xe-135m, Xe-138) 1E-04 uCi/cc Liquid: LLD Principal Gamma Emitters (Mn-54, Fe-59, Co-58, Co-60, Zn-65, Mo-99, 5E-07 uCi/ml Cs-134, Cs-137, Ce-141, Ce-144)

I-131 1E-06 uCi/ml Entrained Gases (Kr-87, Kr-88, Xe-133, Xe-133m, Xe-135, Xe-135m, 1E-05 uCi/ml Xe-138)

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

7. Estimated Total Error Present Procedure CY-AA-170-2100, Estimated Errors of Effluent Measurements, provides the methodology to obtain an overall estimate of the error associated with radioactive effluents. The sum of errors used in this report was documented in IR 138895-02.

E. Batch Releases Liquid Qtr 1 Qtr 2 Qtr 3 Qtr 4 Total Number of Batch Releases 1.60E+01 2.50E+01 2.00E+00 2.60E+01 6.90E+01 Total time period for batch releases (min) 1.47E+03 2.37E+03 1.65E+02 2.65E+03 6.66E+03 Maximum time period for batch release (min) 1.25E+02 1.18E+02 8.30E+01 1.20E+02 1.25E+02 Average time period for batch release (min) 9.19E+01 9.49E+01 8.25E+01 1.02E+02 9.65E+01 Minimum time period for batch release (min) 7.50E+01 7.00E+01 8.20E+01 7.60E+01 7.00E+01 Average stream flow (Schuylkill River) during periods of release of effluents into a flowing 2.32E+04 2.28E+04 2.10E+04 2.38E+04 2.28E+04 stream (Lpm)

Aux Boiler Waste Oil Incineration Qtr 1 Qtr 2 Qtr 3 Qtr 4 Total Number of Batch Releases N/A N/A N/A N/A N/A Total time period for batch releases (min) N/A N/A N/A N/A N/A Maximum time period for batch release (min) N/A N/A N/A N/A N/A Average time period for batch release (min) N/A N/A N/A N/A N/A Minimum time period for batch release (min) N/A N/A N/A N/A N/A Gaseous Qtr 1 Qtr 2 Qtr 3 Qtr 4 Total Number of Batch Releases 0.00E+00 1.00E+00 0.00E+00 0.00E+00 1.00E+00 Total time period for batch releases (min) 0.00E+00 4.25E+02 0.00E+00 0.00E+00 4.25E+02 Maximum time period for batch release (min) 0.00E+00 4.25E+02 0.00E+00 0.00E+00 4.25E+02 Average time period for batch release (min) 0.00E+00 4.25E+02 0.00E+00 0.00E+00 4.25E+02 Minimum time period for batch release (min) 0.00E+00 4.25E+02 0.00E+00 0.00E+00 4.25E+02 Page 4

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

1. Liquid Qtr 1 Qtr 2 Qtr 3 Qtr 4 Total Number of Releases 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 Total Activity Released (Ci) 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00

2. Gaseous Number of Releases 0.00E+00 1.00E+00 0.00E+00 0.00E+00 0.00E+00 Total Activity Released (Ci) 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 On June 20, 2011 a preplanned outage on the Unit 1B Turbine Enclosure HVAC exhaust fans was performed. Radiation Protection and Chemistry developed actions for monitoring potential airborne radioactivity releases via a non normal pathway, when the TE pressure went positive.

Air sampling was established at the 23 line exit roll-up door monitoring for noble gas, particulate, iodine and tritium. Anemometer readings were taken to determine release velocity for effluent release calculations. Using those readings and knowing the size of the opening a maximum release rate of 30,891 cfm was determined. No noble gas, particulate, idodine or tritium activity was identified. The entire issue was documented in IR 1235034.

G. Spills There were no spills to ground containing radioactive material in 2011. However, the Power Block Foundation Sump, which collects groundwater around the reactor buildings, turbine building and rad waste building, had identified tritium in the first quarter sample and analysis of potentially contaminated systems (IR1200128). The maximum activity of 21,000 pCi/L was recorded. The source of the tritium was thought to be groundwater movement from the 2009 turbine building leak. Tritium activity over a period of months returned to below the MDC of 3500 pCi/L.

H. Revisions to the ODCM Revision 25 of the Offsite Dose Calculation Manual (CY-LG-170-301) was approved by PORC and signed by the Plant Manager on October 4, 2011. As part of this revision burning of contaminated oil in the auxillary boiler system was removed. A complete legeable copy of the change paperwork and ODCM is included in this submittal.

I. Radioactive Effluent Monitoring Instrumentation Out of Service for More Than 30 Days There was no radioactive effluent monitoring instrumentation out of service for more than 30 days in 2011.

J. Independent Spent Fuel Storage Installation (ISFSI)

An Independent Spent Fuel Storage Installation (ISFSI) was placed in service starting July 21, 2008. There have been no gaseous or liquid releases from the ISFSI. In 2011 the dose to the nearest resident to the ISFSI was zero, using environmental dosimeters from the Radiological Environmental Monitoring Program.

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

1. During the week of March 29 through April 5, 2011, effluent iodine samples obtained from the North Vent, U1 South Vent and Hot Maintenance Shop identified detectable concentrations of iodine-131. A total of 32.48 uCi of I-131 was released through these vents. No other charcoal samples collected during 2011 showed positive I-131 activity.

This activity was probably related to the events of March 2011 at the Dai-Ichi atomic power plant, Fukushima Japan and the associated trans-Pacific transportation of airborne releases. For completeness, the concentrations detected at the Limerick Generating Station and calculated doses are conservatively included in this report.

2. Hard-to-detect analyses were performed on the third quarter particulate composites to determine if the current gaseous effluent analysis program is complete. Nickel-63 was identified in the North Vent, U1 South Vent and U2 South Vent composites. That activity was applied to all release permits for 2011. The analysis for Ni-63 was added to the particulate composite analysis requirements beginning in 2012.

3. Radiological Impact to Man and Compliance to 40 CFR 190 Limits A. Dose to Members of the Public at or Beyond Site Boundary 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. The ODCM does not require population doses to be calculated. For purposes of this calculation the following assumptions were made:

• Long term annual average meteorology X/Q and D/Q and actual gaseous effluent releases were used.

• Gamma air dose, Beta air dose, Total Body and Skin doses were attributed to noble gas releases.

• Critical organ and age group dose attributed to iodine, particulate, carbon-14 and tritium releases.

• 100 percent occupancy factor was assumed.

• Dosimetry measurements (minus background levels) obtained from the Radiological Environmental Monitoring Program for the nearest residence to the Independent Spent Fuel Storage Installation (ISFSI) was used to determine direct radiation exposure.

• The highest doses from the critical organ and critical age group for each release pathway was summed and added to the net dosimetry measurement from nearest residence to the ISFSI for 40CFR190 compliance.

Gaseious Releases:

The critical age-organ group was the child-bone. Calculated dose was 4.13E-01 mrem, which represents 1.38 percent of the the allowable limits. Carbon-14 represented 99.5 % or 4.11E-01 mrem of the total dose (Table 1).

Liquid Releases:

The critical age-organ was the child-liver. Calculated total body dose and organ dose were 8.38E-02 and 8.38E-02 mrem, respectively.

40 CFR 190 Compliance:

The maximum calculated dose to a real individual would not exceed 1.30E-01 mrem (total body), 5.11E-01 mrem (organ), or 1.80E-01 mrem (thyroid).

All doses calculated were well below all ODCM and 40 CFR Part 190 limits to a real individual.

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SITE: LIMERICK GENERATING STATION - UNITS 1 & 2 LICENSEE: EXELON GENERATION COMPANY, LLC Table 1 Summary of Gaseous and Liquid Effluent Doses to Members of the Public at the Highest Dose Receptors and 40CFR190 Compliance Maximum Individual Applicable Estimated Age  % of Limit Unit Noble Gas Dose Dose Group Applicable Limit Nearest Residence Gamma Air Dose 1.46E-02 All 7.28E-02 20 mRad Nearest Residence Beta Air Dose 8.73E-03 All 2.18E-02 40 mRad Nearest Residence Total Body 1.39E-02 All 1.39E-02 10 mrem Nearest Residence Skin 2.30E-02 All 7.67E-02 30 mrem Iodine, Particulate, C-14 & Tritium Milk Pathway Bone 4.13E-01 Child 1.38E+00 30 mrem Liquid Phonenixville PA Total Body 8.38E-02 Child 1.40E+00 6 mrem Phonenixville PA Liver 8.38E-02 Child 4.19E-01 20 mrem 40 CFR 190 Compliance Gaseous Effluents

% of Noble Particulate, Liquid Net Direct Total Applicable Limit Unit Gas Iodone, C-14 & Effluents Radiation Limit Tritium Total Body Dose 1.39E-02 3.22E-02 8.38E-02 0.00E+00 1.30E-01 5.20E-01 25 mrem Organ Dose 1.39E-02 4.13E-01 8.38E-02 0.00E+00 5.11E-01 2.04E+00 25 mrem Thryoid Dose 1.39E-02 8.26E-02 8.38E-02 0.00E+00 1.80E-01 2.40E-01 75 mrem B. Dose to Members of the Public Inside the Site Boundary 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. 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. A MEMBER OF THE PUBLIC may receive up to 100 mrem in a year (10CFR20.1301). Areas within the site boundary, where radiation dose of this type could occur include the Limerick Information Center on Longview Road, Frick's Lock on the south shore of the Schuylkill River and the railroad tracks that runs along the north 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:

• Long term annual average meteorology and actual effluent releases for the the sectors encompacing the Railroad Tracks (W), Information Center, Frick's Lock and the Security Checkpoint were used.

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

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

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

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SITE: LIMERICK GENERATING STATION - UNITS 1 & 2 LICENSEE: EXELON GENERATION COMPANY, LLC The maximum calculated dose for activities on site was 4.75E-02 mrem at the Rail Road Tracks in the West sector (Table 2). All Doses calculated were a small fraction of the 10 CFR 20.1301 limits.

Table 2 Summary of Gaseous Radiation Doses to Members of the Public for Activities on Site Total Body Dose Organ Dose, (1)

Approx. mrem mrem (1)

X/Q D/Q Location Sector Distance Iodine, Iodine, Total s/m^3 1/m^2 (meters) Noble Gas Particulate, Particulate, C-14 & H-3 C-14 & H-3 R.R. Tracks W 225 2.66E-06 2.36E-08 1.60E-02 5.54E-03 2.60E-02 4.75E-02 Info. Center ESE 884 7.32E-07 9.27E-09 3.09E-04 1.54E-03 7.16E-03 9.01E-03 Frick's Lock WSW 450 5.58E-07 4.78E-09 2.36E-04 1.16E-03 5.45E-03 6.85E-03 Security NNE 682 4.00E-07 4.43E-09 1.69E-04 4.88E-04 1.99E-03 2.65E-03 Check Point (1) The limit for sum of the Total Body Dose and Organ Dose = 100 mrem (ref. 10 CFR 20.1301)

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SITE: LIMERICK GENERATING STATION - UNITS 1 & 2 LICENSEE: EXELON GENERATION COMPANY, LLC Appendix A Effluent and Waste Disposal Summary Page 9

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SITE: LIMERICK GENERATING STATION - UNITS 1 & 2 LICENSEE: EXELON GENERATION COMPANY, LLC LIST OF TABLES PAGE TABLE 1A GASEOUS EFFLUENTS - SUMMATION OF ALL RELEASES 13 TABLE 1B-1 GASEOUS EFFLUENTSGROUND-LEVEL RELEASEBATCH MODE 16 TABLE 1B-2 GASEOUS EFFLUENTS - GROUND LEVEL RELEASE - CONTINUOUS MODE 15 TABLE A2 LIQUID EFFLUENTS - SUMMATION OF ALL RELEASES 16 TABLE 2A-1 LIQUID EFFLUENTS - BATCH MODE 17 TABLE 2A-2 LIQUID EFFLUENTS - CONTINUOUS MODE 18 Page 11

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SITE: LIMERICK GENERATING STATION - UNITS 1 & 2 LICENSEE: EXELON GENERATION COMPANY, LLC TABLE 1A GASEOUS EFFLUENTS - SUMMATION OF ALL RELEASES PERIOD 2011 A. Fission And Activation Uncertainty Units Qtr 1 Qtr 2 Qtr 3 Qtr 4 Total Gasses (%)

Total Release Ci 6.86E+00 1.04E+02 5.42E+01 2.16E+01 1.87E+02 36.6 Average Release Rate for uCi/sec 8.70E-01 1.33E+01 6.87E+00 2.73E+00 5.93E+00 Period Dose - Gamma Air Dose mrad 6.17E-04 9.53E-03 3.39E-03 1.03E-03 1.46E-02

- Beta Air Dose mrad 3.68E-04 5.56E-03 2.05E-03 7.45E-04 8.73E-03 Percent of ODCM Limit

- Gamma Air Dose  % 6.17E-03 9.53E-02 3.39E-02 1.03E-02 7.28E-02

- Beta Air Dose  % 1.84E-03 2.78E-02 1.03E-02 3.73E-03 2.18E-02 Uncertainty B. Radioiodines Units Qtr 1 Qtr 2 Qtr 3 Qtr 4 Total

(%)

Total Release Ci 3.25E-05 < LLD < LLD < LLD 3.25E-05 20.4 Average Release Rate for uCi/sec 4.12E-06 < LLD < LLD < LLD 1.03-06 Period Percent of ODCM Limit  % * * * *

• Uncertainty C. Particulates Units Qtr 1 Qtr 2 Qtr 3 Qtr 4 Total

(%)

Total Release Ci 1.02E-03 9.68E-04 1.11E-03 9.24E-04 4.02E-03 22.6 Average Release Rate for uCi/sec 1.29E-04 1.23E-04 1.41E-04 1.17E-04 1.27E-04 Period Percent of ODCM Limit  % * * * *

• Uncertainty D. Gross Alpha Units Qtr 1 Qtr 2 Qtr 3 Qtr 4 Total

(%)

Total Release Ci < LLD < LLD < LLD < LLD < LLD 22.6 Average Release Rate for uCi/sec < LLD < LLD < LLD < LLD < LLD Period Percent of ODCM Limit  % * * * *

• Uncertainty E. Tritium (H-3) Units Qtr 1 Qtr 2 Qtr 3 Qtr 4 Total

(%)

Total Release Ci 1.57E+01 8.72E+00 9.45E+00 1.17E+01 4.56E+01 15.7 Average Release Rate for uCi/sec 2.00E+00 1.11E+00 1.20E+00 1.48E+00 1.45E+00 Period Percent of ODCM Limit  % * * * *

• F. Carbon-14 Units Qtr 1 Qtr 2 Qtr 3 Qtr 4 Total Total Release Ci 8.36E+00 8.27E+00 9.76E+00 7.65E+00 3.40E+01 Average Release Rate for uCi/sec 1.06E+00 1.05E+00 1.24E+00 9.70E-01 1.08E+00 Period Percent of ODCM Limit  % * * * *

• G. Iodine 131 & 133, Units Qtr 1 Qtr 2 Qtr 3 Qtr 4 Total Particulate, C-14 & H-3 Organ Dose mrem 1.02E-01 1.00E-01 1.18E-01 9.29E-02 4.13E-01 Percent of ODCM Limit  % 6.77E-01 6.70E-01 7.90E-01 6.19E-01 1.38E+00

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

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SITE: LIMERICK GENERATING STATION - UNITS 1 & 2 LICENSEE: EXELON GENERATION COMPANY, LLC TABLE 1B-1 GASEOUS EFFLUENTSGROUND-LEVEL RELEASEBATCH MODE PERIOD 2011 Fission And Units Qtr 1 Qtr 2 Qtr 3 Qtr 4 Total Activation Gasses Ar-41 Ci N/A N/A N/A N/A N/A Kr-85 Ci N/A N/A N/A N/A N/A Kr-85m Ci N/A N/A N/A N/A N/A Kr-87 Ci N/A N/A N/A N/A N/A Kr-88 Ci N/A N/A N/A N/A N/A Xe-133 Ci N/A N/A N/A N/A N/A Xe-135 Ci N/A N/A N/A N/A N/A Xe-135m Ci N/A N/A N/A N/A N/A Xe-138 Ci N/A N/A N/A N/A N/A Total Ci N/A N/A N/A N/A N/A Radioiodines Units Qtr 1 Qtr 2 Qtr 3 Qtr 4 Annual I-131 Ci N/A < LLD N/A N/A < LLD I-133 Ci N/A < LLD N/A N/A < LLD I-135 Ci N/A < LLD N/A N/A < LLD Total Ci N/A < LLD N/A N/A < LLD Particulates Units Qtr 1 Qtr 2 Qtr 3 Qtr 4 Annual Cr-51 Ci N/A < LLD N/A N/A < LLD Mn-54 Ci N/A < LLD N/A N/A < LLD Co-58 Ci N/A < LLD N/A N/A < LLD Co-60 Ci N/A < LLD N/A N/A < LLD Zn-65 Ci N/A < LLD N/A N/A < LLD Sr-89 Ci N/A < LLD N/A N/A < LLD Sr-90 Ci N/A < LLD N/A N/A < LLD Mo-99 Ci N/A < LLD N/A N/A < LLD Ag-110m Ci N/A < LLD N/A N/A < LLD Cs-134 Ci N/A < LLD N/A N/A < LLD Cs-137 Ci N/A < LLD N/A N/A < LLD Ba-140 Ci N/A < LLD N/A N/A < LLD La-140 Ci N/A < LLD N/A N/A < LLD Ce-141 Ci N/A < LLD N/A N/A < LLD Ce-144 Ci N/A < LLD N/A N/A < LLD Total Ci N/A < LLD N/A N/A < LLD H-3 Ci N/A N/A N/A N/A N/A Gross Alpha Ci N/A N/A N/A N/A N/A C-14 Ci N/A N/A N/A N/A N/A Page 14

SITE: LIMERICK GENERATING STATION - UNITS 1 & 2 LICENSEE: EXELON GENERATION COMPANY, LLC TABLE 1B-2 GASEOUS EFFLUENTS - GROUND LEVEL RELEASE - CONTINUOUS MODE PERIOD 2011 Fission And Units Qtr 1 Qtr 2 Qtr 3 Qtr 4 Total Activation Gasses Kr-85m Ci 1.23E-01 1.98E+00 9.61E-01 2.69E-01 3.33E+00 Kr-85 Ci 3.87E-01 5.95E+00 8.45E-01 2.00E-01 7.38E+00 Kr-87 Ci 2.00E-01 3.16E+00 1.13E+00 3.09E-01 4.80E+00 Kr-88 Ci 3.37E-01 5.29E+00 1.43E+00 3.80E-01 7.43E+00 Ar-41 Ci 8.76E-02 1.67E+00 3.07E+00 9.00E-01 5.73E+00 Xe-131m Ci 9.68E-03 1.49E-01 2.11E-02 5.01E-03 1.85E-01 Xe-133 Ci 4.91E-01 9.23E+00 1.61E+01 8.69E+00 3.45E+01 Xe-135m Ci 1.22E+00 2.00E+01 1.33E+01 3.78E+00 3.83E+01 Xe-135 Ci 2.02E+00 2.63E+01 1.14E+01 5.52E+00 4.53E+01 Xe-138 Ci 1.98E+00 3.07E+01 5.94E+00 1.50E+00 4.01E+01 Total Ci 6.86E+00 1.04E+02 5.42E+01 2.16E+01 1.87E+02 Radioiodines Units Qtr 1 Qtr 2 Qtr 3 Qtr 4 Total I-131 Ci 3.25E-05 < LLD < LLD < LLD 3.25E-05 I-133 Ci < LLD < LLD < LLD < LLD < LLD I-135 Ci < LLD < LLD < LLD < LLD < LLD Total Ci 3.25E-05 < LLD < LLD < LLD 3.25E-05 Particulates Units Qtr 1 Qtr 2 Qtr 3 Qtr 4 Annual Cr-51 Ci < LLD < LLD < LLD < LLD < LLD Mn-54 Ci < LLD < LLD < LLD < LLD < LLD Co-58 Ci < LLD < LLD < LLD < LLD < LLD Co-60 Ci 1.99E-05 < LLD < LLD < LLD 1.99E-05 Ni-63 Ci 9.99E-04 9.68E-04 1.11E-03 9.24E-04 4.00E-03 Zn-65 Ci < LLD < LLD < LLD < LLD < LLD Sr-89 Ci < LLD < LLD < LLD < LLD < LLD Sr-90 Ci < LLD < LLD < LLD < LLD < LLD Mo-99 Ci < LLD < LLD < LLD < LLD < LLD Ag-110m Ci < LLD < LLD < LLD < LLD < LLD Sb-125 Ci < LLD < LLD < LLD < LLD < LLD Cs-134 Ci < LLD < LLD < LLD < LLD < LLD Cs-137 Ci < LLD < LLD < LLD < LLD < LLD Ba-140 Ci < LLD < LLD < LLD < LLD < LLD La-140 Ci < LLD < LLD < LLD < LLD < LLD Ce-141 Ci < LLD < LLD < LLD < LLD < LLD Ce-144 Ci < LLD < LLD < LLD < LLD < LLD Total Ci 1.02E-03 9.68E-04 1.11E-03 9.24E-04 4.020E-03 H-3 Ci 1.57E+01 8.72E+00 9.45E+00 1.17E+01 4.56E+01 Gross Alpha Ci < LLD < LLD < LLD < LLD < LLD C-14 Ci 8.36E+00 8.27E+00 9.76E+00 7.65E+00 3.40E+01 Page 15

SITE: LIMERICK GENERATING STATION - UNITS 1 & 2 LICENSEE: EXELON GENERATION COMPANY, LLC TABLE A2 LIQUID EFFLUENTS - SUMMATION OF ALL RELEASES PERIOD 2011 Fission and Activation Uncertainty Products Excluding Units Qtr 1 Qtr 2 Qtr 3 Qtr 4 Total

(%)

Tritium, Gasses & Alpha)

Total Release Ci 5.63E-04 6.91E-04 6.33E-05 1.44E-04 1.46E-03 21.1 Average Concentration uCi/ml 1.60E-08 1.24E-08 1.77E-08 2.21E-09 9.16E-09 Dose - Whole Body mrem 1.77E-02 2.62E-02 1.70E-03 3.83E-02 8.38E-02

- Organ mrem 1.77E-02 2.62E-02 1.70E-03 3.83E-02 8.38E-02

% of ODCM Limit

- Whole Body 5.89E-01 8.73E-01 5.66E-02 1.28E+00 1.40E+00 Dose*  %

- Organ Dose*  % 1.77E-01 2.62E-01 1.70E-02 3.83E-01 4.19E-01 Uncertainty Tritium Units Qtr 1 Qtr 2 Qtr 3 Qtr 4 Total

(%)

Total Release Ci 3.94E+00 5.36E+00 3.22E-01 8.18E+00 1.78E+01 6.4 Average Concentration uCi/ml 1.12E-04 9.60E-05 8.97E-05 1.26E-04 1.12E-04

% of ODCM Limit - ECL  % 1.12E+00 9.60E-01 8.97E-01 1.26E+00 1.12E+00 Dissolved and Entrained Uncertainty Units Qtr 1 Qtr 2 Qtr 3 Qtr 4 Total Gases (%)

Total Release Ci 1.02E-05 2.01E-05 0.00E+00 5.43E-05 8.46E-05 21.1 Average Concentration uCi/ml 2.90E-10 3.60E-10 0.00E+00 8.37E-10 5.30E-10

% of ODCM Limit - ECL  % 1.45E-04 1.80E-04 0.00E+00 4.18E-04 2.65E-04 Uncertainty Gross Alpha Units Qtr 1 Qtr 2 Qtr 3 Qtr 4 Total

(%)

Total Release Ci < LLD < LLD < LLD < LLD < LLD 23.0 Average Concentration uCi/ml N/A N/A N/A N/A N/A Volume of Waste Uncertainty Units Qtr 1 Qtr 2 Qtr 3 Qtr 4 Total Released (%)

Total Liters 9.91E+05 1.70E+06 1.16E+05 1.81E+06 4.61E+06 5.0 Volume of Dilution Water Uncertainty Units Qtr 1 Qtr 2 Qtr 3 Qtr 4 Total used during period (%)

Total Liters 3.41E+07 5.42E+07 3.47E+06 6.31E+07 1.55E+08 3.6

• Percent of limit includes gases and tritium.

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SITE: LIMERICK GENERATING STATION - UNITS 1 & 2 LICENSEE: EXELON GENERATION COMPANY, LLC TABLE 2A-1 LIQUID EFFLUENTS - BATCH MODE PERIOD 2011 Fission and Units Qtr 1 Qtr 2 Qtr 3 Qtr 4 Total Activation Products Cr-51 Ci 1.40E-05 8.66E-06 < LLD < LLD 2.263E-05 Mn-54 Ci 7.94E-05 8.80E-05 7.52E-06 1.17E-05 1.87E-04 Fe-55 Ci < LLD < LLD < LLD < LLD < LLD Co-58 Ci < LLD 2.85E-05 < LLD < LLD 2.85E-05 Fe-59 Ci < LLD < LLD < LLD < LLD < LLD Co-60 Ci 4.24E-04 4.92E-04 4.89E-05 1.27E-04 1.09E-03 Zn-65 Ci 4.58E-05 6.34E-05 6.94E-06 2.23E-06 1.18E-04 Zn-69m Ci < LLD < LLD < LLD < LLD < LLD Sr-89 Ci < LLD < LLD < LLD < LLD < LLD Sr-90 Ci < LLD < LLD < LLD < LLD < LLD Zr-95 Ci < LLD < LLD < LLD < LLD < LLD Nb-95 Ci < LLD < LLD < LLD < LLD < LLD Nb-97 Ci < LLD < LLD < LLD < LLD < LLD Mo-99 Ci < LLD < LLD < LLD < LLD < LLD TC-99m Ci < LLD < LLD < LLD < LLD < LLD AG-110m Ci < LLD < LLD < LLD < LLD < LLD Sb-124 Ci < LLD 4.30E-06 < LLD < LLD 4.30E-06 Sb-125 Ci < LLD 5.53E-06 < LLD < LLD 5.53E-06 I-131 Ci < LLD 8.64E-07 < LLD < LLD 8.64E-07 Cs-134 Ci < LLD < LLD < LLD < LLD < LLD Cs-137 Ci < LLD < LLD < LLD 2.88E-06 2.88E-06 Ba-140 Ci < LLD < LLD < LLD < LLD < LLD La-140 Ci < LLD < LLD < LLD < LLD < LLD Ce-141 Ci < LLD < LLD < LLD < LLD < LLD Total Ci 5.63E-04 6.91E-04 6.33E-05 1.44E-04 1.46E-03 Dissolved and Units Qtr 1 Qtr 2 Qtr 3 Qtr 4 Total Entrained Gases Xe-131m Ci < LLD < LLD < LLD < LLD < LLD Xe-133 Ci 1.02E-05 1.82E-05 < LLD 2.94E-05 5.77E-05 Xe-135 Ci < LLD 1.96E-06 < LLD 2.50E-05 2.69E-05 Total Ci 1.02E-05 2.01E-05 0.00E+00 5.43E-05 8.46E-05 H-3 Ci 3.94E+00 5.36E+00 3.22E-01 8.18E+00 1.78E+01 Gross Alpha Ci < LLD < LLD < LLD < LLD < LLD Page 17

SITE: LIMERICK GENERATING STATION - UNITS 1 & 2 LICENSEE: EXELON GENERATION COMPANY, LLC TABLE 2A-2 LIQUID EFFLUENTS - CONTINUOUS MODE PERIOD 2011 Fission and Units Qtr 1 Qtr 2 Qtr 3 Qtr 4 Total Activation Products Cr-51 Ci N/A N/A N/A N/A N/A Mn-54 Ci N/A N/A N/A N/A N/A Fe-55 Ci N/A N/A N/A N/A N/A Co-58 Ci N/A N/A N/A N/A N/A Fe-59 Ci N/A N/A N/A N/A N/A Co-60 Ci N/A N/A N/A N/A N/A Zn-65 Ci N/A N/A N/A N/A N/A Sr-89 Ci N/A N/A N/A N/A N/A Sr-90 Ci N/A N/A N/A N/A N/A Zr-95 Ci N/A N/A N/A N/A N/A Nb-95 Ci N/A N/A N/A N/A N/A Mo-99 Ci N/A N/A N/A N/A N/A Tc-99m Ci N/A N/A N/A N/A N/A Ag-110m Ci N/A N/A N/A N/A N/A I-131 Ci N/A N/A N/A N/A N/A Cs-134 Ci N/A N/A N/A N/A N/A Cs-137 Ci N/A N/A N/A N/A N/A Ba-140 Ci N/A N/A N/A N/A N/A La-140 Ci N/A N/A N/A N/A N/A Ce-141 Ci N/A N/A N/A N/A N/A Total Ci N/A N/A N/A N/A N/A Dissolved and Units Qtr 1 Qtr 2 Qtr 3 Qtr 4 Total Entrained Gases Xe-131m Ci N/A N/A N/A N/A N/A Xe-133 Ci N/A N/A N/A N/A N/A Xe-135 Ci N/A N/A N/A N/A N/A Total Ci N/A N/A N/A N/A N/A H-3 Ci N/A N/A N/A N/A N/A Gross Alpha Ci N/A N/A N/A N/A N/A Page 18

SITE: LIMERICK GENERATING STATION - UNITS 1 & 2 LICENSEE: EXELON GENERATION COMPANY, LLC Appendix B Solid Waste and Irradiated Fuel Shipments Page 19

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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) 01/01/2011 - 12/31/2011

1. Type of waste Type of waste Unit 12 Month Period Estimated Error %

3

a. Spent resin, filters sludges, evaporator m 83.15 25%

bottoms, etc Ci 2.68E+02 3

b. Dry compressible waste, contaminated m 99.11 25%

equipment, etc. Ci 9.50E-01 3

c. Irradiated components, control rods, etc. m None N/A Ci None 3

d. Other (Describe) m None N/A Ci None

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

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

Waste Class Isotope A Percent Curies

• Abundance C-14 7.25E-01 0.27%

Mn-54 1.18E+01 4.41%

Fe-55 1.41E+02 52.69%

Co-60 9.50E+01 35.50%

Ni-59 4.59E-03 0.01%

Ni-63 4.49E+00 1.67%

Zn-65 1.10E+01 4.11%

Sr-90 5.91E-02 0.02%

Cs-137 2.38E+00 0.89%

Ce-144 7.54E-03 0.01%

Pu-241 1.73E-01 0.06%

H-3 1.52E-02 0.01%

Co-58 9.61E-01 0.35%

Totals 2.68E+02 100.00%

• Activity is estimated Page 21

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

Waste Class A Percent Isotope Curies

• Abundance Co-60 2.46E-01 25.89%

Cs-137 5.61E-04 0.06%

Fe-55 6.62E-01 69.68%

Mn-54 3.00E-02 3.16%

Ni-63 9.79E-03 1.03%

Zn-65 1.64E-03 0.18%

TOTALS 9.50E-01 100.00%

• Activity is estimated

3. Solid Waste (Disposition)

Number of Mode of Transportation Destination Shipments 40 Truck Duratek to Energy Solutions / Clive 10 Truck Limerick Gen. Sta. to Energy Solutions / Clive

4. Waste (Processing)

Number of Mode of Transportation Destination Shipments 32 Truck Limerick to Duratek

5. Waste (Solidification)

Number of Mode of Transportation Destination Shipments 0 N/A N/A Category A - 13 shipments Type A LSA Category A - 3 shipments > Type A LSA Category B - 26 shipments Type A LSA Category C - No shipments made Category D - No shipments made B. Irradiated Fuel Shipments (disposition)

Number of Shipments Mode of Transportation Destination 0 N/A N/A C. Changes to the Process Control Program There were no revisions to procedure RW-AA-100, Process Control Program for Radioactive Wastes.

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SITE: LIMERICK GENERATING STATION - UNITS 1 & 2 LICENSEE: EXELON GENERATION COMPANY, LLC Appendix C ERRATA - Previous Reports Page 23

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SITE: LIMERICK GENERATING STATION - UNITS 1 & 2 LICENSEE: EXELON GENERATION COMPANY, LLC Correction to 2008 Report A March 2008 radwasted discharge to NPDES outfall 001 was reclassified as a spill to ground and subsequent discharge to NPDES outfall 023, which empties to the river (IR7542414).

Correction to 2009 Report In the 2009 ARERR Table A-1 the rows were not labeled properly. Actural numbers supplied were correct (IR1141537). A corrected table is included in the ERRATA Section of this report.

Correction to 2010 Report While performing a review of the gaseous dose factors listed in revision 25 of the ODCM with those loaded into the effluent software, OpenEMS, it was discovered that the dose factors for cow milk, meat and vegetation were missing from the effluent dose software package. OpenEMS is the software used to calculate the required monthly doses to comply with ODCM Control 3.2.2.3., Dose from Iodine-131, Iodine-133, Tritium, and Radioactive Material in Particulate Form. Further investigation determined that the dose factors had been mistakenly removed from the software package after a November 23, 2010 update. As a result the dose calculations performed for the last five weeks of 2010 were not correct (IR1297197). A corrected 2010 dose tables is included in the ERRATA Section of this report.

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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 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:

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.

I. 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.

Formatted: Bullets and Numbering K.Spills

11. There were no spills to ground containing radioactive material in 2011. However, the Power Block Foundation Sump, which collects groundwater around the reactor buildings, turbine building and rad waste building, had identified tritium in the first quarter sample and analysis of potentially contaminated systems (IR1200128). The maximum activity of 21,000 pCi/L was recorded. The source of the tritium was thought to be groundwater movement from the 2009 turbine building leak. Tritium activity over a period of months returned to below the MDC of 3500 pCi/L.

Formatted: Bullets and Numbering K. Spills On March 20, 2008 a radwaste tank discharge was in progress when the cooling tower blowdown overflowed to an NPDES outfall (IR7542414). Sampling at the time indicated no tritium or other radionuclides present.

However, during the April 29, 2008 sampling of a nearby groundwater monitoring well, MW-LM-5, tritium was identified at a concentration of 902 pCi/L. Therefore, this overflow was reclassified as a spill to ground per the NEI 07-07 groundwater initiative and an abnormal release to Possum Hollow Creek, which discharges to the River.

A bounding calculation was performed, assuming a one day exposure to the tank contents after dilutuion from the cooling tower blowdown. The concentration in the tank post dilution was 1.23E+05 pCi/L of tritium and Page 29

SITE: LIMERICK GENERATING STATION - UNITS 1 & 2 LICENSEE: EXELON GENERATION COMPANY, LLC 9.22E-01 pCi/L of Co-60. The calculated maximum doses were to the child / GI-Li of 2.76E-02 mrem and 2.73E-02 child / whole body (IR1342884).

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SITE: LIMERICK GENERATING STATION - UNITS 1 & 2 LICENSEE: EXELON GENERATION COMPANY, LLC ANNUAL RADIOACTIVE EFFLUENT RELEASE REPORT CORRECTED NO. 35 January 1, 2009 through December 31, 2009 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 A-1 GASEOUS EFFLUENTS - SUMMATION OF ALL RELEASES PERIOD 2009 A. A. Fission And Uncertainty Units Qtr 1 Qtr 2 Qtr 3 Qtr 4 Total Activation Gasses (%)

Total Release Ci 6.35E+00 5.51E+00 1.31E+01 3.18E+00 2.82E+01 36.6 Average Release Rate for uCi/sec Period 8.05E-01 6.99E-01 1.67E+00 4.03E-01 8.93E-01 Dose - Gamma Air Dose mrad 1.10E-02 7.07E-03 1.94E-02 3.91E-03 4.14E-02

- Beta Air Dose mrad 6.41E-03 4.25E-03 1.12E-02 2.36E-03 2.42E-02 Percent of ODCM Limit

% 0.11 0.07 0.19 0.04 0.21

- Gamma Air Dose

- Beta Air Dose  % 0.03 0.02 0.06 0.01 0.06 Uncertainty B. B. Radioiodines Units Qtr 1 Qtr 2 Qtr 3 Qtr 4 Total

(%)

Total Release Ci 7.85E-05 9.35E-06 < LLD < LLD 8.78E-05 20.4 Average Release Rate for uCi/sec 9.96E-06 1.19E-06 < LLD < LLD 2.79E-06 Period Percent of ODCM Limit  % * * * *

• Uncertainty C. C. Particulates Units Qtr 1 Qtr 2 Qtr 3 Qtr 4 Total

(%)

Total Release Ci 2.38E-05 2.50E-05 < LLD < LLD 4.88E-05 22.6 Average Release Rate for uCi/sec 3.02E-06 3.17E-06 < LLD < LLD 1.55E-06 Period Percent of ODCM Limit  % * * * *

• Gross Alpha Radioactivity Ci < LLD < LLD < LLD < LLD < LLD Uncertainty D.D.Tritium Units Qtr 1 Qtr 2 Qtr 3 Qtr 4 Total

(%)

Total Release Ci 1.25E+01 5.42E+00 7.50E+00 7.96E+00 3.34E+01 15.7 Average Release Rate for uCi/sec 1.59E+00 6.87E-01 9.51E-01 1.01E+00 1.07E+00 Period Percent of ODCM Limit  % * * * *

• E. E. Iodine 131 & 133, Units Qtr 1 Qtr 2 Qtr 3 Qtr 4 Total Particulate & Tritium Organ Dose mrem 2.19E-02 5.74E-03 7.35E-03 7.81E-03 3.68E-02 Percent of ODCM Limit  % 0.15 0.04 0.05 0.05 0.12

• 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 ANNUAL RADIOACTIVE EFFLUENT RELEASE REPORT CORRECTED NO. 36 January 1, 2010 through December 31, 2010 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 1A GASEOUS EFFLUENTS - SUMMATION OF ALL RELEASES PERIOD 2010 A. Fission And Activation Uncertainty Units Qtr 1 Qtr 2 Qtr 3 Qtr 4 Total Gasses (%)

Total Release Ci 4.77E+00 1.87E+01 2.43E+01 6.34E+00 5.41E+01 36.6 Average Release Rate for uCi/sec 6.05E-01 2.38E+00 3.08E+00 8.04E-01 1.72E+00 Period Dose - Gamma Air Dose mrad 2.88E-04 1.60E-03 1.59E-03 5.55E-04 4.04E-03

- Beta Air Dose mrad 1.76E-04 9.41E-04 9.62E-04 3.25E-04 2.40E-03 Percent of ODCM Limit

- Gamma Air Dose  % 2.88E-03 1.60E-02 1.59E-02 5.55E-03 2.02E-02

- Beta Air Dose  % 8.78E-04 4.70E-03 4.81E-03 1.62E-03 6.01E-03 Uncertainty B. Radioiodines Units Qtr 1 Qtr 2 Qtr 3 Qtr 4 Total

(%)

Total Release Ci < LLD < LLD < LLD < LLD < LLD 20.4 Average Release Rate for uCi/sec < LLD < LLD < LLD < LLD < LLD Period Percent of ODCM Limit  % * * * *

• Uncertainty C. Particulates Units Qtr 1 Qtr 2 Qtr 3 Qtr 4 Total

(%)

Total Release Ci 5.78E-08 3.48E-06 < LLD < LLD 3.53E-06 22.6 Average Release Rate for uCi/sec 7.33E-09 4.41E-07 < LLD < LLD 1.12E-07 Period Percent of ODCM Limit  % * * * *

• Uncertainty D. Gross Alpha Units Qtr 1 Qtr 2 Qtr 3 Qtr 4 Total

(%)

Total Release Ci < LLD < LLD < LLD < LLD < LLD 22.6 Average Release Rate for uCi/sec < LLD < LLD < LLD < LLD < LLD Period Percent of ODCM Limit  % * * * *

• Uncertainty E. Tritium (H-3) Units Qtr 1 Qtr 2 Qtr 3 Qtr 4 Total

(%)

Total Release Ci 1.13E+01 4.61E+00 1.31E+01 1.39E+01 4.28E+01 15.7 Average Release Rate for uCi/sec 1.43E+00 5.84E-01 1.66E+00 1.76E+00 1.36E+00 Period Percent of ODCM Limit  % * * * *

• F. Carbon-14 Units Qtr 1 Qtr 2 Qtr 3 Qtr 4 Total Total Release Ci 4.06E+00 5.47E+00 5.11E+00 4.15E+00 1.88E+01 Average Release Rate for uCi/sec 5.15E-01 6.94E-01 6.48E-01 5.26E-01 5.96E-01 Period Percent of ODCM Limit  % * * * *

• G. Iodine 131 & 133, Units Qtr 1 Qtr 2 Qtr 3 Qtr 4 Total Particulate, C-14 & H-3 5.01E-Organ Dose mrem 4.91E-02 6.61E-02 4.10E-02 025.01E- 2.06E-02 012.06E-01 Percent of ODCM Limit  % 3.27E-01 4.40E-01 2.73E-01 3.34E- 6.87E-Page 38

SITE: LIMERICK GENERATING STATION - UNITS 1 & 2 LICENSEE: EXELON GENERATION COMPANY, LLC 013.34E- 016.87E-01 01

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

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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

• Long term annual average meteorology and actual gaseous effluent releases were used.

• Gamma air dose, Beta air dose, Total Body and Skin doses were attributed to noble gas releases.

• Critical organ and age group dose attributed to iodine, particulate, carbon-14 and tritium releases.

• 100 percent occupancy factor was assumed.

• Thermoluminescence Dosimetry (TLD) measurements (minus background levels) obtained from the Radiological Environmental Monitoring Program for the nearest residence to the Independent Spent Fuel Storage Installation (ISFSI) was used to determine direct radiation exposure.

• For 40 CFR 190 compliance, the highest doses from the critical organ and critical age group for each release pathway was summed and added to the net TLD measurement from nearest residence to the ISFSI.

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

Maximum Individual Applicable Estimated Age  % of Limit Unit Dose Dose Group Applicable Noble Gas Limit Nearest Residence Gamma Air Dose 4.04E-03 All 2.02E-02 20 mRad Nearest Residence Beta Air Dose 2.40E-03 All 6.01E-03 40 mRad Nearest Residence Total Body 3.83E-03 All 3.84E-02 10 mrem Nearest Residence Skin 6.39E-03 All 2.13E-02 30 mrem Iodine, Particulate, C-14 & Tritium 6.87E-Cow Milk Bone 2.06E- Child 016.87E- 30 mrem 012.06E-01 01 Liquid Aqua PA Total Body 1.76E-02 Child 2.93E-01 6 mrem Aqua PA Liver 1.77E-02 Child 8.82E-02 20 mrem 40 CFR 190 Compliance Gaseous Effluents

% of Noble Gas Particulate, Liquid Direct Total Applicable Limit Unit Iodone, C-14 Effluents Radiation Limit

& Tritium 3.84E-03 4.25E- 6.01E- 2.40E-Total Body Dose 1.76E-02 0.00E+00 25 mrem 024.25E-02 026.01E-02 012.40E-01 3.84E-03 2.06E- 0.00E+00 2.24E- 8.94E-Organ Dose 1.77E-02 25 mrem 012.06E-01 012.24E-01 018.94E-01 3.84E-03 4.25E- 0.00E+00 6.01E- 8.01E-Thryoid Dose 1.76E-02 75 mrem 024.25E-02 026.01E-02 028.01E-02 Doses calculated were well below all ODCM and 40 CFR Part 190 limits to a real individual.

The ODCM does not require population doses to be calculated.

Page 40

SITE: LIMERICK GENERATING STATION - UNITS 1 & 2 LICENSEE: EXELON GENERATION COMPANY, LLC 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. 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. A MEMBER OF THE PUBLIC may receive up to 100 mrem in a year (10CFR20.1301). 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 south shore of the Schuylkill River and the railroad tracks that runs along the north 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:

• Long term annual average meteorology and actual effluent releases for the the sectors encompacing the Railroad Tracks (W), Information Center, Frick's Lock and the Security Checkpoint were used.

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

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

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

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

Total Body Dose Organ Dose, (1)

Approx. mrem mrem (1) x/Q D/Q Location Sector Distance Iodine, Iodine, Total s/m^3 1/m^2 (meters) Noble Gas Particulate, Particulate, C-14 & H-3 C-14 & H-3 4.66E-1.56E- 2.66E-R.R. Tracks W 225 2.66E-06 2.36E-08 4.43E-03 024.66E-021.56E-02 022.66E-02 02 1.28E-4.29E- 7.32E-Info. Center ESE 884 7.32E-07 9.27E-09 1.22E-03 021.28E-034.29E-03 037.32E-03 02 2.31E-4.22E- 1.88E-Frick's Lock WSW 450 5.58E-07 4.78E-09 9.30E-04 012.31E-024.22E-02 011.88E-01 01 National Guard / 2.06E-1.09E-Security NNE 682 4.00E-07 4.43E-09 6.66E-04 3.04E-04 032.06E-031.09E-03 Check Point 03 Doses calculated were a small fraction of the 10 CFR 20.1301 limits.

Notes:

(1) The limit for sum of the Total Body Dose and Organ Dose = 100 mrem (ref. 10 CFR 20.1301)

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SITE: LIMERICK GENERATING STATION - UNITS 1 & 2 LICENSEE: EXELON GENERATION COMPANY, LLC Appendix D Meteorological Data Page 43

SITE: LIMERICK GENERATING STATION - UNITS 1 & 2 LICENSEE: EXELON GENERATION COMPANY, LLC (Page Intentionally Left Blank)

Page 44

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, 2011 47 Table D - 2 Wind Speed by Direction Measured at 175 Feet for Various Stability Classes for the Limerick Generating Station, January - March, 2011 55 Table D - 3 Wind Speed by Direction Measured at 30 Feet for Various Stability Classes for the Limerick Generating Station, April - June, 2011 61 Table D - 4 Wind Speed by Direction Measured at 175 Feet for Various Stability Classes for the Limerick Generating Station, April - June, 2011 68 Table D - 5 Wind Speed by Direction Measured at 30 Feet for Various Stability Classes for the Limerick Generating Station, July - September, 2011 75 Table D - 6 Wind Speed by Direction Measured at 175 Feet for Various Stability Classes for the Limerick Generating Station, July - September, 2011 82 Table D - 7 Wind Speed by Direction Measured at 30 Feet for Various Stability Classes for the Limerick Generating Station, October - December, 2011 89 Table D - 8 Wind Speed by Direction Measured at 175 Feet for Various Stability Classes for the Limerick Generating Station, October - December, 2011 96 Table D - 9 Wind Speed by Direction Measured at 30 Feet for Various Stability Classes for the Limerick Generating Station, January - December, 2011 103 Table D - 10 Wind Speed by Direction Measured at 175 Feet for Various Stability Classes for the Limerick Generating Station, January - December, 2011 105 Table D - 11 Annual x/Q undepleded and D/Q values for the North Stack, Limerick Generating Station, 2011 107 Table D - 12 Annual x/Q undepleted and D/Q values for the South Stack, Limerick Generating Station, 2011 109 Page 45

SITE: LIMERICK GENERATING STATION - UNITS 1 & 2 LICENSEE: EXELON GENERATION COMPANY, LLC (Page Intentionally Left Blank)

Page 46

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, 2011 Limerick Tower 1 Period of Record: January - March 2011 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 2 0 0 0 0 2 NNE 0 3 0 0 0 0 3 NE 0 0 0 0 0 0 0 ENE 0 0 0 0 0 0 0 E 0 1 0 0 0 0 1 ESE 0 1 0 0 0 0 1 SE 0 3 0 0 0 0 3 SSE 0 1 2 0 0 0 3 S 0 2 5 0 0 0 7 SSW 0 5 4 0 0 0 9 SW 0 9 1 0 0 0 10 WSW 1 7 1 0 0 0 9 W 1 4 4 0 0 0 9 WNW 0 6 4 0 0 0 10 NW 0 2 23 1 0 0 26 NNW 0 2 0 0 0 0 2 Variable 0 0 0 0 0 0 0 Total 2 48 44 1 0 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: 8 Page 47

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, 2011 Limerick Tower 1 Period of Record: January - March 2011 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 0 5 0 0 0 5 NNE 0 0 0 0 0 0 0 NE 0 1 0 0 0 0 1 ENE 1 1 0 0 0 0 2 E 0 1 0 0 0 0 1 ESE 0 4 0 1 0 0 5 SE 0 1 0 0 0 0 1 SSE 1 1 1 0 0 0 3 S 0 0 1 0 0 0 1 SSW 0 4 1 0 0 0 5 SW 1 4 1 0 0 0 6 WSW 0 5 1 0 0 0 6 W 0 4 2 0 0 0 6 WNW 0 4 4 1 1 0 10 NW 0 9 19 2 0 0 30 NNW 0 1 2 0 0 0 3 Variable 0 0 0 0 0 0 0 Total 3 40 37 4 1 0 85 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: 8 Page 48

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, 2011 Limerick Tower 1 Period of Record: January - March 2011 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 1 1 4 0 0 0 6 NNE 0 1 0 0 0 0 1 NE 1 0 0 0 0 0 1 ENE 0 0 0 0 0 0 0 E 1 3 0 0 0 0 4 ESE 0 1 0 1 0 0 2 SE 0 0 0 0 0 0 0 SSE 0 2 1 0 0 0 3 S 0 4 1 1 0 0 6 SSW 1 0 3 0 0 0 4 SW 3 1 0 0 0 0 4 WSW 0 3 0 0 0 0 3 W 1 6 2 0 0 0 9 WNW 0 9 13 3 0 0 25 NW 0 5 27 4 4 0 40 NNW 0 1 7 4 0 0 12 Variable 0 0 0 0 0 0 0 Total 8 37 58 13 4 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: 8 Page 49

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, 2011 Limerick Tower 1 Period of Record: January - March 2011 Stability Class - Neutral - 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 12 25 21 2 0 0 60 NNE 13 19 3 0 0 0 35 NE 18 27 5 0 0 0 50 ENE 27 32 5 0 0 0 64 E 13 43 34 6 0 0 96 ESE 5 5 3 15 0 0 28 SE 4 15 8 1 0 0 28 SSE 4 24 7 0 0 0 35 S 9 16 19 0 0 0 44 SSW 2 15 2 0 0 0 19 SW 5 9 4 0 0 0 18 WSW 8 17 3 0 0 0 28 W 6 25 9 3 0 0 43 WNW 11 61 58 27 1 0 158 NW 10 64 153 70 16 0 313 NNW 7 23 28 19 1 0 78 Variable 0 0 0 0 0 0 0 Total 154 420 362 143 18 0 1097 Hours of calm in this stability class: 3 Hours of missing wind measurements in this stability class: 3 Hours of missing stability measurements in all stability classes: 8 Page 50

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, 2011 Limerick Tower 1 Period of Record: January - March 2011 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 4 10 0 0 0 0 14 NNE 8 5 0 0 0 0 13 NE 6 3 0 0 0 0 9 ENE 16 5 0 0 0 0 21 E 11 6 1 0 0 0 18 ESE 5 4 4 0 0 0 13 SE 4 10 0 0 0 0 14 SSE 2 2 1 0 0 0 5 S 6 8 2 0 0 0 16 SSW 10 17 0 0 0 0 27 SW 17 18 1 0 0 0 36 WSW 18 11 1 0 0 0 30 W 27 14 6 1 0 0 48 WNW 21 43 2 9 0 0 75 NW 13 26 6 0 0 0 45 NNW 13 13 1 0 0 0 27 Variable 2 0 0 0 0 0 2 Total 183 195 25 10 0 0 413 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: 8 Page 51

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, 2011 Limerick Tower 1 Period of Record: January - March 2011 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 6 1 0 0 0 0 7 NNE 4 2 0 0 0 0 6 NE 2 0 0 0 0 0 2 ENE 5 1 0 0 0 0 6 E 5 2 0 0 0 0 7 ESE 5 0 0 0 0 0 5 SE 2 0 0 0 0 0 2 SSE 4 1 0 0 0 0 5 S 4 1 0 0 0 0 5 SSW 4 4 0 0 0 0 8 SW 10 0 0 0 0 0 10 WSW 18 0 0 0 0 0 18 W 21 1 0 0 0 0 22 WNW 24 8 0 0 0 0 32 NW 10 5 0 0 0 0 15 NNW 9 0 0 0 0 0 9 Variable 2 0 0 0 0 0 2 Total 135 26 0 0 0 0 161 Hours of calm in this stability class: 12 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 8 Page 52

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, 2011 Limerick Tower 1 Period of Record: January - March 2011 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 0 0 0 0 9 NNE 10 0 0 0 0 0 10 NE 9 0 0 0 0 0 9 ENE 8 0 0 0 0 0 8 E 2 0 0 0 0 0 2 ESE 1 0 0 0 0 0 1 SE 0 0 0 0 0 0 0 SSE 2 0 0 0 0 0 2 S 3 0 0 0 0 0 3 SSW 3 0 0 0 0 0 3 SW 4 0 0 0 0 0 4 WSW 9 0 0 0 0 0 9 W 29 0 0 0 0 0 29 WNW 22 7 0 0 0 0 29 NW 13 0 0 0 0 0 13 NNW 13 0 0 0 0 0 13 Variable 1 0 0 0 0 0 1 Total 138 7 0 0 0 0 145 Hours of calm in this stability class: 13 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 8 Page 53

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, 2011 Limerick Tower 1 Period of Record: January - March 2011 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 3 1 0 0 0 4 NNE 0 2 0 0 0 0 2 NE 0 0 0 0 0 0 0 ENE 0 0 0 0 0 0 0 E 0 1 0 0 0 0 1 ESE 0 0 0 0 0 0 0 SE 0 2 1 0 0 0 3 SSE 0 1 1 0 0 0 2 S 0 1 4 3 0 0 8 SSW 0 0 6 3 1 0 10 SW 0 2 7 1 0 0 10 WSW 0 1 3 5 0 0 9 W 0 3 4 4 0 0 11 WNW 1 1 7 6 0 0 15 NW 0 0 3 16 0 0 19 NNW 0 1 0 0 0 0 1 Variable 0 0 0 0 0 0 0 Total 1 18 37 38 1 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: 8 Page 54

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, 2011 Limerick Tower 1 Period of Record: January - March 2011 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 0 0 0 5 NNE 0 0 0 0 0 0 0 NE 0 1 0 0 0 0 1 ENE 1 0 0 0 0 0 1 E 0 2 0 0 0 0 2 ESE 0 0 0 1 0 0 1 SE 0 4 1 0 0 0 5 SSE 0 0 0 0 0 0 0 S 0 1 4 0 0 0 5 SSW 1 3 1 1 0 0 6 SW 0 1 3 1 0 0 5 WSW 0 1 5 2 0 0 8 W 0 0 0 4 0 0 4 WNW 0 4 6 3 2 1 16 NW 0 1 10 12 0 0 23 NNW 0 1 2 0 0 0 3 Variable 0 0 0 0 0 0 0 Total 2 19 37 24 2 1 85 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: 8 Page 55

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, 2011 Limerick Tower 1 Period of Record: January - March 2011 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 0 3 3 0 0 6 NNE 1 0 2 0 0 0 3 NE 0 0 0 0 0 0 0 ENE 0 0 0 0 0 0 0 E 2 2 0 0 0 0 4 ESE 0 0 0 0 1 0 1 SE 0 1 0 0 0 0 1 SSE 0 1 0 0 0 0 1 S 0 2 1 1 2 0 6 SSW 0 4 0 3 0 0 7 SW 0 3 1 0 0 0 4 WSW 0 1 3 0 0 0 4 W 0 1 3 1 2 0 7 WNW 0 5 9 12 4 2 32 NW 0 1 6 22 3 1 33 NNW 0 0 2 3 3 1 9 Variable 0 0 0 0 0 0 0 Total 3 21 30 45 15 4 118 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: 8 Page 56

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, 2011 Limerick Tower 1 Period of Record: January - March 2011 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 2 13 28 9 2 0 54 NNE 8 13 17 3 0 0 41 NE 9 17 11 3 0 0 40 ENE 5 31 15 0 0 0 51 E 7 20 36 7 0 0 70 ESE 5 8 12 17 12 0 54 SE 3 7 9 8 4 1 32 SSE 1 6 23 8 1 0 39 S 2 10 16 20 0 0 48 SSW 1 7 14 5 0 0 27 SW 8 3 7 1 2 0 21 WSW 1 6 13 7 4 0 31 W 3 5 16 9 2 3 38 WNW 6 15 62 72 35 23 213 NW 2 10 50 114 42 17 235 NNW 1 10 27 25 11 3 77 Variable 0 0 0 0 0 0 0 Total 64 181 356 308 115 47 1071 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 32 Hours of missing stability measurements in all stability classes: 8 Page 57

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, 2011 Limerick Tower 1 Period of Record: January - March 2011 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 2 8 11 0 0 0 21 NNE 3 0 7 0 0 0 10 NE 3 5 0 0 0 0 8 ENE 3 6 0 0 0 0 9 E 5 2 3 2 0 0 12 ESE 5 8 3 5 0 0 21 SE 3 10 1 1 0 0 15 SSE 2 9 3 0 0 0 14 S 0 8 6 4 0 0 18 SSW 0 11 16 1 0 0 28 SW 2 10 29 4 1 0 46 WSW 1 13 11 7 0 0 32 W 2 10 14 2 2 2 32 WNW 2 17 51 8 4 5 87 NW 1 8 22 6 0 0 37 NNW 2 7 17 1 0 0 27 Variable 0 0 0 0 0 0 0 Total 36 132 194 41 7 7 417 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: 8 Page 58

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, 2011 Limerick Tower 1 Period of Record: January - March 2011 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 6 3 0 0 0 15 NNE 1 3 2 0 0 0 6 NE 0 0 0 0 0 0 0 ENE 2 1 0 0 0 0 3 E 1 1 4 1 0 0 7 ESE 6 2 0 1 0 0 9 SE 0 3 0 0 0 0 3 SSE 1 1 0 0 0 0 2 S 2 5 0 1 0 0 8 SSW 0 8 4 0 0 0 12 SW 2 6 5 0 0 0 13 WSW 2 2 5 0 0 0 9 W 3 12 1 0 0 0 16 WNW 3 16 17 3 0 0 39 NW 2 7 9 0 0 0 18 NNW 2 7 4 0 0 0 13 Variable 0 0 0 0 0 0 0 Total 33 80 54 6 0 0 173 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: 8 Page 59

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, 2011 Limerick Tower 1 Period of Record: January - March 2011 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 0 3 1 0 0 0 4 NNE 1 0 1 0 0 0 2 NE 0 2 0 0 0 0 2 ENE 2 1 0 0 0 0 3 E 0 1 0 0 0 0 1 ESE 3 1 0 0 0 0 4 SE 3 1 0 0 0 0 4 SSE 2 0 0 0 0 0 2 S 1 2 0 0 0 0 3 SSW 1 7 0 0 0 0 8 SW 6 10 4 0 0 0 20 WSW 4 11 5 0 0 0 20 W 3 6 3 0 0 0 12 WNW 3 17 8 5 0 0 33 NW 6 16 4 0 0 0 26 NNW 1 9 0 0 0 0 10 Variable 3 1 0 0 0 0 4 Total 39 88 26 5 0 0 158 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 60

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, 2011 Limerick Tower 1 Period of Record: April - June 2011 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 5 0 0 0 0 5 NNE 0 4 0 0 0 0 4 NE 0 3 0 0 0 0 3 ENE 0 1 0 0 0 0 1 E 0 0 4 1 0 0 5 ESE 0 1 2 0 0 0 3 SE 0 2 0 0 0 0 2 SSE 0 4 0 0 0 0 4 S 1 8 5 0 0 0 14 SSW 1 19 13 0 0 0 33 SW 0 6 1 0 0 0 7 WSW 2 22 6 0 0 0 30 W 0 11 4 0 0 0 15 WNW 1 22 5 0 0 0 28 NW 2 9 14 5 0 0 30 NNW 0 3 0 3 0 0 6 Variable 0 0 0 0 0 0 0 Total 7 120 54 9 0 0 190 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: 2 Page 61

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, 2011 Limerick Tower 1 Period of Record: April - June 2011 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 5 1 0 0 0 6 NNE 3 8 1 0 0 0 12 NE 0 1 0 0 0 0 1 ENE 1 1 0 0 0 0 2 E 1 4 2 0 0 0 7 ESE 0 0 1 0 0 0 1 SE 1 2 0 0 0 0 3 SSE 0 3 0 0 0 0 3 S 2 8 3 0 0 0 13 SSW 1 8 3 0 0 0 12 SW 0 3 0 0 0 0 3 WSW 2 6 0 0 0 0 8 W 2 4 1 0 0 0 7 WNW 4 11 2 0 0 0 17 NW 0 18 10 4 0 0 32 NNW 1 10 3 0 0 0 14 Variable 0 0 0 0 0 0 0 Total 18 92 27 4 0 0 141 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: 2 Page 62

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, 2011 Limerick Tower 1 Period of Record: April - June 2011 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 2 5 5 0 0 0 12 NNE 0 2 0 0 0 0 2 NE 1 2 0 0 0 0 3 ENE 3 4 0 0 0 0 7 E 6 5 2 0 0 0 13 ESE 2 5 4 1 0 0 12 SE 5 3 0 0 0 0 8 SSE 3 4 0 0 0 0 7 S 0 15 5 0 0 0 20 SSW 4 11 2 0 0 0 17 SW 2 3 1 0 0 0 6 WSW 5 4 1 0 0 0 10 W 1 3 0 0 0 0 4 WNW 2 5 4 1 0 0 12 NW 5 13 12 9 0 0 39 NNW 1 5 6 0 0 0 12 Variable 1 0 0 0 0 0 1 Total 43 89 42 11 0 0 185 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: 2 Page 63

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, 2011 Limerick Tower 1 Period of Record: April - June 2011 Stability Class - Neutral - 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 12 15 5 0 0 0 32 NNE 11 9 3 0 0 0 23 NE 20 19 2 0 0 0 41 ENE 21 37 15 0 0 0 73 E 21 55 36 7 0 0 119 ESE 18 40 29 8 1 0 96 SE 15 15 3 0 1 0 34 SSE 10 29 4 0 0 0 43 S 12 42 22 1 0 0 77 SSW 4 23 9 2 0 0 38 SW 10 14 2 0 0 0 26 WSW 6 11 2 0 0 0 19 W 11 18 4 0 0 0 33 WNW 11 21 12 1 0 0 45 NW 11 53 40 17 0 0 121 NNW 11 15 14 0 0 0 40 Variable 3 0 0 0 0 0 3 Total 207 416 202 36 2 0 863 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: 2 Page 64

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, 2011 Limerick Tower 1 Period of Record: April - June 2011 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 5 11 0 0 0 0 16 NNE 9 6 0 0 0 0 15 NE 8 9 0 0 0 0 17 ENE 11 2 0 0 0 0 13 E 14 3 0 0 0 0 17 ESE 13 6 0 0 0 0 19 SE 7 4 0 0 0 0 11 SSE 12 18 1 0 0 0 31 S 18 44 10 1 0 0 73 SSW 9 19 3 0 0 0 31 SW 19 9 2 0 0 0 30 WSW 27 9 4 0 0 0 40 W 32 19 6 0 0 0 57 WNW 27 28 3 0 0 0 58 NW 17 26 3 0 0 0 46 NNW 10 9 3 0 0 0 22 Variable 3 0 0 0 0 0 3 Total 241 222 35 1 0 0 499 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: 2 Page 65

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, 2011 Limerick Tower 1 Period of Record: April - June 2011 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 8 0 0 0 0 0 8 NNE 6 2 1 0 0 0 9 NE 5 2 0 0 0 0 7 ENE 7 0 0 0 0 0 7 E 3 1 0 0 0 0 4 ESE 0 3 0 0 0 0 3 SE 2 0 0 0 0 0 2 SSE 5 0 0 0 0 0 5 S 1 1 0 0 0 0 2 SSW 3 0 0 0 0 0 3 SW 4 0 0 0 0 0 4 WSW 14 0 0 0 0 0 14 W 14 1 0 0 0 0 15 WNW 28 2 0 0 0 0 30 NW 21 4 0 0 0 0 25 NNW 8 0 0 0 0 0 8 Variable 5 0 0 0 0 0 5 Total 134 16 1 0 0 0 151 Hours of calm in this stability class: 8 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 2 Page 66

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, 2011 Limerick Tower 1 Period of Record: April - June 2011 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 12 0 0 0 0 0 12 NNE 4 0 0 0 0 0 4 NE 4 0 0 0 0 0 4 ENE 3 0 0 0 0 0 3 E 1 0 0 0 0 0 1 ESE 1 1 0 0 0 0 2 SE 0 0 0 0 0 0 0 SSE 1 0 0 0 0 0 1 S 2 0 0 0 0 0 2 SSW 2 0 0 0 0 0 2 SW 0 0 0 0 0 0 0 WSW 4 0 0 0 0 0 4 W 7 0 0 0 0 0 7 WNW 32 0 0 0 0 0 32 NW 31 0 0 0 0 0 31 NNW 14 0 0 0 0 0 14 Variable 2 0 0 0 0 0 2 Total 120 1 0 0 0 0 121 Hours of calm in this stability class: 16 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 2 Page 67

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, 2011 Limerick Tower 1 Period of Record: April - June 2011 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 2 3 0 0 0 5 NNE 0 6 0 0 0 0 6 NE 0 1 1 0 0 0 2 ENE 0 1 0 0 0 0 1 E 0 0 0 4 0 0 4 ESE 0 0 0 3 0 0 3 SE 0 2 0 0 0 0 2 SSE 0 0 1 0 0 0 1 S 0 4 7 2 0 0 13 SSW 0 7 14 11 3 0 35 SW 0 5 5 2 2 0 14 WSW 0 3 13 11 2 0 29 W 0 2 15 4 3 0 24 WNW 0 3 17 6 2 0 28 NW 0 3 4 7 7 0 21 NNW 0 1 0 1 0 0 2 Variable 0 0 0 0 0 0 0 Total 0 40 80 51 19 0 190 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: 2 Page 68

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, 2011 Limerick Tower 1 Period of Record: April - June 2011 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 2 6 0 0 0 8 NNE 0 5 5 0 0 0 10 NE 1 1 1 0 0 0 3 ENE 1 1 0 0 0 0 2 E 0 3 0 1 0 0 4 ESE 0 1 3 0 0 0 4 SE 1 2 0 0 0 0 3 SSE 0 3 0 0 0 0 3 S 0 4 4 1 0 0 9 SSW 1 5 2 4 1 0 13 SW 2 1 4 1 0 0 8 WSW 0 3 4 3 0 0 10 W 0 5 3 2 1 0 11 WNW 0 5 8 5 2 0 20 NW 0 3 16 2 2 0 23 NNW 0 3 5 1 1 0 10 Variable 0 0 0 0 0 0 0 Total 6 47 61 20 7 0 141 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: 2 Page 69

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, 2011 Limerick Tower 1 Period of Record: April - June 2011 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 1 5 4 0 0 11 NNE 2 1 2 0 0 0 5 NE 0 3 1 0 0 0 4 ENE 0 5 0 0 0 0 5 E 1 6 1 0 0 0 8 ESE 1 4 3 5 0 0 13 SE 1 3 3 0 0 0 7 SSE 3 5 2 0 0 0 10 S 0 9 6 4 1 0 20 SSW 1 6 9 2 1 0 19 SW 0 4 2 0 1 0 7 WSW 1 3 1 5 0 0 10 W 2 2 3 0 0 0 7 WNW 2 5 4 9 2 0 22 NW 0 7 10 4 6 0 27 NNW 1 3 3 3 0 0 10 Variable 0 0 0 0 0 0 0 Total 16 67 55 36 11 0 185 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: 2 Page 70

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, 2011 Limerick Tower 1 Period of Record: April - June 2011 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 4 13 9 3 0 0 29 NNE 5 8 10 3 0 0 26 NE 8 21 9 2 0 0 40 ENE 5 24 30 4 0 0 63 E 8 31 39 31 3 0 112 ESE 10 19 39 21 6 2 97 SE 2 19 22 5 2 1 51 SSE 5 22 19 2 0 0 48 S 0 24 35 12 5 1 77 SSW 1 9 20 12 4 0 46 SW 6 8 8 3 2 0 27 WSW 1 10 11 9 2 0 33 W 3 7 10 10 1 0 31 WNW 1 14 27 21 4 0 67 NW 2 15 23 25 13 1 79 NNW 3 11 11 12 0 0 37 Variable 1 0 0 0 0 0 1 Total 65 255 322 175 42 5 864 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: 2 Page 71

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, 2011 Limerick Tower 1 Period of Record: April - June 2011 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 1 8 8 0 0 0 17 NNE 2 4 6 0 0 0 12 NE 1 6 9 0 0 0 16 ENE 4 7 2 0 0 0 13 E 7 11 2 0 0 0 20 ESE 5 2 4 0 0 0 11 SE 3 8 3 0 0 0 14 SSE 0 13 13 2 0 0 28 S 2 27 34 14 2 0 79 SSW 1 11 22 4 2 0 40 SW 3 12 11 6 0 0 32 WSW 2 19 14 6 5 0 46 W 1 9 18 10 1 0 39 WNW 5 16 39 14 0 0 74 NW 1 13 19 5 0 0 38 NNW 3 9 11 2 0 0 25 Variable 0 0 0 0 0 0 0 Total 41 175 215 63 10 0 504 Hours of calm in this stability class: 2 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 2 Page 72

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, 2011 Limerick Tower 1 Period of Record: April - June 2011 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 2 1 1 0 0 7 NNE 1 3 4 0 0 0 8 NE 2 1 1 0 0 0 4 ENE 2 4 0 0 0 0 6 E 1 3 0 0 0 0 4 ESE 2 3 1 0 0 0 6 SE 2 0 1 0 0 0 3 SSE 1 0 3 0 0 0 4 S 1 1 0 0 0 0 2 SSW 0 3 0 0 0 0 3 SW 0 7 2 0 0 0 9 WSW 1 4 3 0 0 0 8 W 4 10 6 0 0 0 20 WNW 5 24 17 0 0 0 46 NW 1 13 8 0 0 0 22 NNW 2 3 1 0 0 0 6 Variable 0 0 0 0 0 0 0 Total 28 81 48 1 0 0 158 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: 2 Page 73

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, 2011 Limerick Tower 1 Period of Record: April - June 2011 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 5 6 0 0 0 0 11 NNE 2 2 2 0 0 0 6 NE 0 1 0 0 0 0 1 ENE 2 2 0 0 0 0 4 E 1 1 0 0 0 0 2 ESE 0 0 0 0 0 0 0 SE 1 0 0 0 0 0 1 SSE 0 0 1 0 0 0 1 S 3 0 0 0 0 0 3 SSW 1 3 2 0 0 0 6 SW 2 2 0 0 0 0 4 WSW 2 6 2 0 0 0 10 W 2 9 0 0 0 0 11 WNW 4 28 8 0 0 0 40 NW 7 18 4 0 0 0 29 NNW 5 2 0 0 0 0 7 Variable 1 0 0 0 0 0 1 Total 38 80 19 0 0 0 137 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: 2 Page 74

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, 2011 Limerick Tower 1 Period of Record: July - September 2011 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 6 1 0 0 0 7 NNE 0 5 3 0 0 0 8 NE 0 1 1 0 0 0 2 ENE 0 1 0 0 0 0 1 E 0 0 0 0 0 0 0 ESE 1 2 0 0 0 0 3 SE 0 4 0 0 0 0 4 SSE 0 3 0 0 0 0 3 S 1 5 4 0 0 0 10 SSW 4 22 3 0 0 0 29 SW 6 28 0 0 0 0 34 WSW 5 27 0 0 0 0 32 W 3 25 0 0 0 0 28 WNW 2 23 3 0 0 0 28 NW 0 17 1 0 0 0 18 NNW 0 5 1 0 0 0 6 Variable 0 0 0 0 0 0 0 Total 22 174 17 0 0 0 213 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: 7 Page 75

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, 2011 Limerick Tower 1 Period of Record: July - September 2011 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 2 2 0 0 0 4 NNE 0 1 0 0 0 0 1 NE 0 4 0 0 0 0 4 ENE 0 0 0 0 0 0 0 E 0 0 0 0 0 0 0 ESE 1 2 0 0 0 0 3 SE 0 3 0 0 0 0 3 SSE 0 0 0 0 0 0 0 S 1 1 2 0 0 0 4 SSW 1 6 0 0 0 0 7 SW 3 6 0 0 0 0 9 WSW 4 7 0 0 0 0 11 W 5 3 0 0 0 0 8 WNW 1 7 0 0 0 0 8 NW 0 8 6 0 0 0 14 NNW 0 10 3 0 0 0 13 Variable 0 0 0 0 0 0 0 Total 16 60 13 0 0 0 89 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: 7 Page 76

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, 2011 Limerick Tower 1 Period of Record: July - September 2011 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 1 0 0 0 0 1 NNE 1 0 1 0 0 0 2 NE 0 0 1 0 0 0 1 ENE 0 1 1 0 0 0 2 E 2 0 0 0 0 0 2 ESE 2 0 0 0 0 0 2 SE 0 1 0 0 0 0 1 SSE 1 1 0 0 0 0 2 S 1 4 1 0 0 0 6 SSW 4 9 1 0 0 0 14 SW 2 4 0 0 0 0 6 WSW 4 4 0 0 0 0 8 W 4 7 0 0 0 0 11 WNW 6 4 0 0 0 0 10 NW 0 14 6 0 0 0 20 NNW 2 5 2 0 0 0 9 Variable 0 0 0 0 0 0 0 Total 29 55 13 0 0 0 97 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: 7 Page 77

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, 2011 Limerick Tower 1 Period of Record: July - September 2011 Stability Class - Neutral - 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 10 18 7 0 0 0 35 NNE 13 18 0 0 0 0 31 NE 8 30 2 0 0 0 40 ENE 9 45 4 0 0 0 58 E 15 28 5 0 0 0 48 ESE 6 16 5 0 0 0 27 SE 9 12 0 0 0 0 21 SSE 7 1 0 0 0 0 8 S 6 16 4 0 0 0 26 SSW 15 29 2 0 0 0 46 SW 20 14 0 0 0 0 34 WSW 24 8 0 0 0 0 32 W 14 10 1 0 0 0 25 WNW 12 14 2 0 0 0 28 NW 20 41 25 2 1 0 89 NNW 12 19 10 2 1 0 44 Variable 0 0 0 0 0 0 0 Total 200 319 67 4 2 0 592 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: 7 Page 78

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, 2011 Limerick Tower 1 Period of Record: July - September 2011 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 17 8 2 1 0 0 28 NNE 22 6 0 6 2 0 36 NE 26 9 1 1 0 0 37 ENE 26 14 4 0 0 0 44 E 12 16 4 0 0 0 32 ESE 11 11 4 0 0 0 26 SE 21 16 0 0 0 0 37 SSE 20 17 0 0 0 0 37 S 20 52 6 0 0 0 78 SSW 37 31 0 0 0 0 68 SW 34 5 0 0 0 0 39 WSW 27 2 0 0 0 0 29 W 52 1 0 0 0 0 53 WNW 59 13 2 1 0 0 75 NW 38 24 3 4 0 0 69 NNW 16 7 0 1 0 0 24 Variable 0 0 0 0 0 0 0 Total 438 232 26 14 2 0 712 Hours of calm in this stability class: 8 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 7 Page 79

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, 2011 Limerick Tower 1 Period of Record: July - September 2011 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 21 0 0 0 0 0 21 NNE 10 1 0 0 0 0 11 NE 5 1 0 0 0 0 6 ENE 5 0 0 0 0 0 5 E 7 0 0 0 0 0 7 ESE 9 0 0 0 0 0 9 SE 9 1 0 0 0 0 10 SSE 10 0 0 0 0 0 10 S 3 2 0 0 0 0 5 SSW 13 7 0 0 0 0 20 SW 23 0 0 0 0 0 23 WSW 20 1 0 0 0 0 21 W 35 0 0 0 0 0 35 WNW 39 5 0 0 0 0 44 NW 42 11 0 0 0 0 53 NNW 26 0 0 0 0 0 26 Variable 1 0 0 0 0 0 1 Total 278 29 0 0 0 0 307 Hours of calm in this stability class: 11 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 7 Page 80

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, 2011 Limerick Tower 1 Period of Record: July - September 2011 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 13 0 0 0 0 0 13 NNE 9 0 0 0 0 0 9 NE 8 0 0 0 0 0 8 ENE 6 0 0 0 0 0 6 E 6 0 0 0 0 0 6 ESE 1 0 0 0 0 0 1 SE 2 0 0 0 0 0 2 SSE 1 0 0 0 0 0 1 S 1 0 0 0 0 0 1 SSW 5 0 0 0 0 0 5 SW 3 1 0 0 0 0 4 WSW 6 0 0 0 0 0 6 W 10 0 0 0 0 0 10 WNW 26 0 0 0 0 0 26 NW 37 0 0 0 0 0 37 NNW 20 0 0 0 0 0 20 Variable 0 0 0 0 0 0 0 Total 154 1 0 0 0 0 155 Hours of calm in this stability class: 17 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 7 Page 81

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, 2011 Limerick Tower 1 Period of Record: July - September 2011 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 4 3 0 0 0 7 NNE 0 1 4 2 0 0 7 NE 0 2 1 0 0 0 3 ENE 0 1 0 0 0 0 1 E 0 0 0 0 0 0 0 ESE 0 2 0 0 0 0 2 SE 0 2 2 0 0 0 4 SSE 0 1 2 0 0 0 3 S 0 5 1 2 0 0 8 SSW 2 10 15 3 0 0 30 SW 0 9 17 9 0 0 35 WSW 2 14 14 4 0 0 34 W 0 14 24 6 0 0 44 WNW 0 4 18 2 0 0 24 NW 0 3 6 0 0 0 9 NNW 0 0 2 0 0 0 2 Variable 0 0 0 0 0 0 0 Total 4 72 109 28 0 0 213 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: 7 Page 82

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, 2011 Limerick Tower 1 Period of Record: July - September 2011 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 1 2 1 0 0 4 NNE 0 2 1 0 0 0 3 NE 0 2 0 0 0 0 2 ENE 0 0 0 0 0 0 0 E 0 0 0 0 0 0 0 ESE 0 2 1 0 0 0 3 SE 0 1 0 1 0 0 2 SSE 0 1 1 0 0 0 2 S 0 0 1 2 0 0 3 SSW 0 4 2 0 0 0 6 SW 3 3 3 1 0 0 10 WSW 0 8 3 1 0 0 12 W 0 5 3 1 0 0 9 WNW 1 4 5 0 0 0 10 NW 0 1 8 4 0 0 13 NNW 0 1 9 0 0 0 10 Variable 0 0 0 0 0 0 0 Total 4 35 39 11 0 0 89 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: 7 Page 83

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, 2011 Limerick Tower 1 Period of Record: July - September 2011 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 1 0 0 0 2 NNE 0 0 1 0 0 0 1 NE 0 0 0 0 0 0 0 ENE 0 2 2 0 0 0 4 E 0 2 0 0 0 0 2 ESE 0 0 0 0 0 0 0 SE 0 2 0 0 0 0 2 SSE 0 1 0 0 0 0 1 S 0 3 3 0 0 0 6 SSW 3 4 7 2 0 0 16 SW 0 4 2 1 0 0 7 WSW 2 8 2 0 0 0 12 W 1 6 2 1 0 0 10 WNW 1 7 5 1 0 0 14 NW 1 4 12 1 0 0 18 NNW 0 1 1 0 0 0 2 Variable 0 0 0 0 0 0 0 Total 9 44 38 6 0 0 97 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: 7 Page 84

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, 2011 Limerick Tower 1 Period of Record: July - September 2011 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 13 11 4 0 0 33 NNE 8 12 6 1 0 0 27 NE 6 15 15 0 0 0 36 ENE 8 28 31 0 0 0 67 E 4 12 19 3 0 0 38 ESE 3 22 10 5 0 0 40 SE 3 8 10 1 0 0 22 SSE 3 7 0 1 0 0 11 S 4 8 12 3 0 0 27 SSW 4 10 19 6 0 0 39 SW 7 24 14 2 0 0 47 WSW 9 16 8 2 0 0 35 W 9 7 10 1 1 1 29 WNW 6 18 19 4 1 0 48 NW 4 19 29 10 2 1 65 NNW 3 5 15 3 1 1 28 Variable 0 0 0 0 0 0 0 Total 86 224 228 46 5 3 592 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: 7 Page 85

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, 2011 Limerick Tower 1 Period of Record: July - September 2011 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 7 8 6 0 1 0 22 NNE 6 7 7 0 2 5 27 NE 12 13 8 0 1 1 35 ENE 12 19 10 2 0 0 43 E 10 6 9 3 0 0 28 ESE 7 16 8 5 0 0 36 SE 3 11 12 3 0 0 29 SSE 6 19 18 0 0 0 43 S 3 30 43 11 0 0 87 SSW 8 25 36 2 0 0 71 SW 3 29 11 1 0 0 44 WSW 4 27 11 1 0 0 43 W 8 22 12 1 0 1 44 WNW 10 36 32 1 0 4 83 NW 9 30 15 4 0 1 59 NNW 6 10 7 0 0 1 24 Variable 0 0 0 0 0 0 0 Total 114 308 245 34 4 13 718 Hours of calm in this stability class: 2 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 7 Page 86

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, 2011 Limerick Tower 1 Period of Record: July - September 2011 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 6 0 0 0 0 11 NNE 4 9 1 0 0 0 14 NE 2 2 2 0 0 0 6 ENE 5 2 0 0 0 0 7 E 2 2 1 0 0 0 5 ESE 4 1 0 0 0 0 5 SE 1 3 0 0 0 0 4 SSE 8 5 0 0 0 0 13 S 1 7 5 0 0 0 13 SSW 3 8 14 0 0 0 25 SW 2 17 8 0 0 0 27 WSW 2 19 1 1 0 0 23 W 4 17 3 0 0 0 24 WNW 10 31 31 0 0 0 72 NW 10 24 14 2 0 0 50 NNW 11 4 1 0 0 0 16 Variable 0 0 0 0 0 0 0 Total 74 157 81 3 0 0 315 Hours of calm in this stability class: 3 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 7 Page 87

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, 2011 Limerick Tower 1 Period of Record: July - September 2011 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 2 4 1 0 0 0 7 NNE 2 1 0 0 0 0 3 NE 2 0 0 0 0 0 2 ENE 1 1 0 0 0 0 2 E 2 1 1 0 0 0 4 ESE 6 1 0 0 0 0 7 SE 0 0 0 0 0 0 0 SSE 2 0 0 0 0 0 2 S 1 3 0 0 0 0 4 SSW 1 8 1 0 0 0 10 SW 1 7 0 0 0 0 8 WSW 3 10 3 0 0 0 16 W 6 10 0 0 0 0 16 WNW 3 23 11 0 0 0 37 NW 7 21 10 0 0 0 38 NNW 4 10 0 0 0 0 14 Variable 0 0 0 0 0 0 0 Total 43 100 27 0 0 0 170 Hours of calm in this stability class: 2 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 7 Page 88

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, 2011 Limerick Tower 1 Period of Record: October - December 2011 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 0 0 0 0 0 NNE 0 0 0 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 0 0 0 0 0 0 SE 0 0 0 0 0 0 0 SSE 0 0 0 0 0 0 0 S 0 0 0 0 0 0 0 SSW 0 14 4 0 0 0 18 SW 0 7 1 0 0 0 8 WSW 0 0 5 0 0 0 5 W 2 1 2 0 0 0 5 WNW 0 2 0 0 0 0 2 NW 0 0 0 0 0 0 0 NNW 0 0 0 0 0 0 0 Variable 0 0 0 0 0 0 0 Total 2 24 12 0 0 0 38 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 89

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, 2011 Limerick Tower 1 Period of Record: October - December 2011 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 0 0 0 0 0 0 NNE 0 0 0 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 0 0 0 0 0 0 SE 0 0 0 0 0 0 0 SSE 0 0 0 0 0 0 0 S 0 0 1 0 0 0 1 SSW 0 5 1 0 0 0 6 SW 0 6 1 0 0 0 7 WSW 1 3 3 0 0 0 7 W 2 4 2 0 0 0 8 WNW 3 3 2 1 0 0 9 NW 0 2 0 0 0 0 2 NNW 0 0 0 0 0 0 0 Variable 0 0 0 0 0 0 0 Total 6 23 10 1 0 0 40 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 90

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, 2011 Limerick Tower 1 Period of Record: October - December 2011 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 1 4 0 0 0 5 NNE 0 1 0 0 0 0 1 NE 0 2 0 0 0 0 2 ENE 0 2 0 0 0 0 2 E 1 1 0 0 0 0 2 ESE 0 0 0 0 0 0 0 SE 0 1 0 0 0 0 1 SSE 1 3 0 0 0 0 4 S 1 1 1 0 0 0 3 SSW 1 7 5 0 0 0 13 SW 0 4 2 0 0 0 6 WSW 0 1 2 0 0 0 3 W 2 5 1 0 0 0 8 WNW 2 5 1 0 0 0 8 NW 1 5 6 0 0 0 12 NNW 0 0 0 0 0 0 0 Variable 0 0 0 0 0 0 0 Total 9 39 22 0 0 0 70 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 91

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, 2011 Limerick Tower 1 Period of Record: October - December 2011 Stability Class - Neutral - 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 20 12 0 0 0 41 NNE 8 13 3 0 0 0 24 NE 12 21 1 0 0 0 34 ENE 14 27 10 0 0 0 51 E 13 20 23 2 0 0 58 ESE 5 2 7 1 0 0 15 SE 7 2 0 0 0 0 9 SSE 4 8 1 0 0 0 13 S 13 17 2 0 0 0 32 SSW 6 20 8 0 0 0 34 SW 11 19 3 0 0 0 33 WSW 10 7 2 0 0 0 19 W 8 18 15 0 0 0 41 WNW 16 54 42 10 0 0 122 NW 11 66 85 21 1 0 184 NNW 14 13 20 6 0 0 53 Variable 0 0 0 0 0 0 0 Total 161 327 234 40 1 0 763 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 17 Hours of missing stability measurements in all stability classes: 6 Page 92

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, 2011 Limerick Tower 1 Period of Record: October - December 2011 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 10 7 5 0 0 0 22 NNE 8 9 0 0 0 0 17 NE 14 4 0 0 0 0 18 ENE 18 7 0 0 0 0 25 E 14 11 0 0 0 0 25 ESE 7 8 4 0 0 0 19 SE 5 13 0 0 0 0 18 SSE 8 21 0 0 0 0 29 S 14 46 5 0 0 0 65 SSW 9 42 13 0 0 0 64 SW 20 27 6 0 0 0 53 WSW 33 28 1 0 0 0 62 W 39 24 7 0 0 0 70 WNW 34 56 13 0 0 0 103 NW 21 38 13 0 0 0 72 NNW 17 2 4 0 0 0 23 Variable 1 0 0 0 0 0 1 Total 272 343 71 0 0 0 686 Hours of calm in this stability class: 2 Hours of missing wind measurements in this stability class: 16 Hours of missing stability measurements in all stability classes: 6 Page 93

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, 2011 Limerick Tower 1 Period of Record: October - December 2011 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 3 0 0 0 0 0 3 NE 3 0 0 0 0 0 3 ENE 17 2 0 0 0 0 19 E 7 0 0 0 0 0 7 ESE 7 1 0 0 0 0 8 SE 2 0 0 0 0 0 2 SSE 5 1 0 0 0 0 6 S 5 3 0 0 0 0 8 SSW 11 5 0 0 0 0 16 SW 15 4 0 0 0 0 19 WSW 18 1 0 0 0 0 19 W 26 3 0 0 0 0 29 WNW 29 10 0 0 0 0 39 NW 19 1 0 0 0 0 20 NNW 11 0 0 0 0 0 11 Variable 0 0 0 0 0 0 0 Total 187 31 0 0 0 0 218 Hours of calm in this stability class: 3 Hours of missing wind measurements in this stability class: 15 Hours of missing stability measurements in all stability classes: 6 Page 94

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, 2011 Limerick Tower 1 Period of Record: October - December 2011 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 22 0 0 0 0 0 22 NNE 11 0 0 0 0 0 11 NE 11 0 0 0 0 0 11 ENE 9 0 0 0 0 0 9 E 11 0 0 0 0 0 11 ESE 5 0 0 0 0 0 5 SE 6 0 0 0 0 0 6 SSE 2 0 0 0 0 0 2 S 4 0 0 0 0 0 4 SSW 4 2 0 0 0 0 6 SW 6 0 0 0 0 0 6 WSW 10 0 0 0 0 0 10 W 43 0 0 0 0 0 43 WNW 64 1 0 0 0 0 65 NW 42 1 0 0 0 0 43 NNW 22 0 0 0 0 0 22 Variable 1 0 0 0 0 0 1 Total 273 4 0 0 0 0 277 Hours of calm in this stability class: 17 Hours of missing wind measurements in this stability class: 37 Hours of missing stability measurements in all stability classes: 6 Page 95

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, 2011 Limerick Tower 1 Period of Record: October - December 2011 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 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 0 0 0 0 0 SE 0 0 0 0 0 0 0 SSE 0 0 0 0 0 0 0 S 0 0 0 0 0 0 0 SSW 0 0 14 5 0 0 19 SW 0 0 5 3 0 0 8 WSW 0 0 0 6 0 0 6 W 0 4 0 1 0 0 5 WNW 0 0 0 0 0 0 0 NW 0 0 0 0 0 0 0 NNW 0 0 0 0 0 0 0 Variable 0 0 0 0 0 0 0 Total 0 4 19 15 0 0 38 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 96

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, 2011 Limerick Tower 1 Period of Record: October - December 2011 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 0 0 0 0 0 NNE 0 0 0 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 0 0 0 0 0 0 SE 0 0 0 0 0 0 0 SSE 0 0 0 0 0 0 0 S 0 0 1 0 0 0 1 SSW 0 4 2 2 0 0 8 SW 0 2 2 2 0 0 6 WSW 1 1 2 3 1 1 9 W 0 4 1 3 0 0 8 WNW 1 1 4 0 2 0 8 NW 0 0 0 0 0 0 0 NNW 0 0 0 0 0 0 0 Variable 0 0 0 0 0 0 0 Total 2 12 12 10 3 1 40 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 97

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, 2011 Limerick Tower 1 Period of Record: October - December 2011 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 0 1 3 0 0 4 NNE 0 2 0 0 0 0 2 NE 0 1 0 0 0 0 1 ENE 0 3 0 0 0 0 3 E 1 1 0 0 0 0 2 ESE 0 0 0 0 0 0 0 SE 0 1 0 0 0 0 1 SSE 0 0 1 0 0 0 1 S 0 3 2 0 0 0 5 SSW 0 2 6 5 0 0 13 SW 0 2 3 0 2 0 7 WSW 0 3 1 0 2 1 7 W 0 6 3 1 0 0 10 WNW 1 4 3 3 0 0 11 NW 0 1 3 2 0 0 6 NNW 0 0 0 0 0 0 0 Variable 0 0 0 0 0 0 0 Total 2 29 23 14 4 1 73 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 98

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, 2011 Limerick Tower 1 Period of Record: October - December 2011 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 2 12 19 6 0 0 39 NNE 2 14 19 2 0 0 37 NE 6 21 8 0 0 0 35 ENE 8 22 8 7 0 0 45 E 4 16 21 18 2 0 61 ESE 8 3 2 9 0 0 22 SE 5 5 1 2 0 0 13 SSE 4 5 3 1 0 0 13 S 4 14 15 3 1 0 37 SSW 1 14 17 8 1 0 41 SW 2 7 14 5 2 0 30 WSW 2 7 9 7 2 0 27 W 0 9 9 10 3 0 31 WNW 8 18 66 50 17 4 163 NW 3 8 58 49 6 4 128 NNW 3 9 25 14 7 0 58 Variable 0 0 0 0 0 0 0 Total 62 184 294 191 41 8 780 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 99

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, 2011 Limerick Tower 1 Period of Record: October - December 2011 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 5 13 7 3 0 0 28 NNE 5 5 12 3 0 0 25 NE 6 3 0 0 0 0 9 ENE 10 12 4 0 0 0 26 E 10 10 8 2 0 0 30 ESE 7 5 5 2 0 0 19 SE 7 3 7 3 0 0 20 SSE 2 6 16 3 0 0 27 S 0 12 42 12 0 0 66 SSW 1 17 43 19 3 0 83 SW 5 16 26 18 6 0 71 WSW 1 15 23 18 2 0 59 W 3 12 17 13 0 0 45 WNW 3 29 47 30 1 0 110 NW 2 18 34 9 0 0 63 NNW 6 2 14 1 0 0 23 Variable 0 0 0 0 0 0 0 Total 73 178 305 136 12 0 704 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 100

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, 2011 Limerick Tower 1 Period of Record: October - December 2011 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 0 0 0 0 9 NNE 1 3 0 0 0 0 4 NE 1 2 0 0 0 0 3 ENE 8 2 0 0 0 0 10 E 4 1 2 0 0 0 7 ESE 6 4 3 1 0 0 14 SE 2 6 0 0 0 0 8 SSE 2 6 0 0 0 0 8 S 2 3 1 0 0 0 6 SSW 3 11 10 1 0 0 25 SW 2 8 10 2 0 0 22 WSW 1 9 9 0 0 0 19 W 4 13 5 0 0 0 22 WNW 4 20 20 6 0 0 50 NW 5 7 13 0 0 0 25 NNW 0 2 0 0 0 0 2 Variable 0 0 0 0 0 0 0 Total 48 103 73 10 0 0 234 Hours of calm in this stability class: 2 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 6 Page 101

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, 2011 Limerick Tower 1 Period of Record: October - December 2011 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 7 1 1 0 0 0 9 NNE 3 0 0 0 0 0 3 NE 5 1 0 0 0 0 6 ENE 5 1 0 0 0 0 6 E 6 4 0 0 0 0 10 ESE 3 5 2 0 0 0 10 SE 12 3 0 0 0 0 15 SSE 5 5 0 0 0 0 10 S 5 12 2 0 0 0 19 SSW 6 11 5 1 0 0 23 SW 6 10 6 0 0 0 22 WSW 5 5 4 0 0 0 14 W 8 18 2 0 0 0 28 WNW 6 50 18 2 0 0 76 NW 13 38 18 0 0 0 69 NNW 8 3 0 0 0 0 11 Variable 0 0 0 0 0 0 0 Total 103 167 58 3 0 0 331 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 102

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, 2011 Limerick Tower 1 January-December, 2011 30 ft. Wind Speed and Direction 171Ft-26Ft Delta-T (F)

Number of Observations = 8545 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 0.01 0.01 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 0.04 0.04 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 0.07 0.07 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 0.09 0.09 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 0.05 0.05 0.26 EU 0.00 0.00 0.00 0.00 0.00 0.01 0.00 0.00 0.02 0.06 0.07 0.09 0.07 0.04 0.02 0.00 0.39 0.39 MU 0.00 0.04 0.00 0.02 0.01 0.01 0.01 0.01 0.04 0.02 0.05 0.08 0.11 0.09 0.00 0.01 0.50 0.50 1 SU 0.04 0.01 0.02 0.04 0.12 0.05 0.06 0.06 0.02 0.12 0.08 0.11 0.09 0.12 0.07 0.04 1.03 1.03

- N 0.50 0.53 0.68 0.83 0.73 0.40 0.41 0.29 0.47 0.32 0.54 0.56 0.46 0.59 0.61 0.51 8.41 8.41 3 SS 0.42 0.55 0.63 0.83 0.60 0.42 0.43 0.49 0.68 0.76 1.05 1.23 1.76 1.65 1.04 0.66 13.20 13.20 MS 0.51 0.27 0.18 0.40 0.26 0.25 0.18 0.28 0.15 0.36 0.61 0.82 1.12 1.40 1.08 0.63 8.50 8.50 ES 0.66 0.40 0.37 0.30 0.23 0.09 0.09 0.07 0.12 0.16 0.15 0.34 1.04 1.69 1.44 0.81 7.97 7.97 40.00 EU 0.15 0.14 0.05 0.02 0.01 0.05 0.11 0.09 0.18 0.70 0.59 0.66 0.48 0.62 0.33 0.12 4.28 4.28 MU 0.08 0.11 0.07 0.02 0.06 0.07 0.07 0.05 0.11 0.27 0.22 0.25 0.18 0.29 0.43 0.25 2.52 2.52 4 SU 0.09 0.05 0.05 0.08 0.11 0.07 0.06 0.12 0.28 0.32 0.14 0.14 0.25 0.27 0.43 0.13 2.57 2.57

- N 0.91 0.69 1.14 1.65 1.71 0.74 0.51 0.73 1.06 1.02 0.66 0.50 0.83 1.76 2.62 0.82 17.34 17.34 7 SS 0.42 0.30 0.29 0.33 0.42 0.34 0.50 0.68 1.76 1.28 0.69 0.59 0.68 1.64 1.33 0.36 11.61 11.61 MS 0.01 0.06 0.04 0.04 0.04 0.05 0.01 0.02 0.08 0.19 0.05 0.02 0.06 0.29 0.25 0.00 1.19 1.19 ES 0.00 0.00 0.00 0.00 0.00 0.01 0.00 0.00 0.00 0.02 0.01 0.00 0.00 0.09 0.01 0.00 0.15 0.15 39.67 EU 0.01 0.04 0.01 0.00 0.05 0.02 0.00 0.02 0.16 0.28 0.04 0.14 0.12 0.14 0.44 0.01 1.49 1.49 MU 0.09 0.01 0.00 0.00 0.02 0.01 0.00 0.01 0.08 0.06 0.02 0.05 0.06 0.09 0.41 0.09 1.02 1.02 8 SU 0.15 0.01 0.01 0.01 0.02 0.05 0.00 0.01 0.09 0.13 0.04 0.04 0.04 0.21 0.60 0.18 1.58 1.58

- N 0.53 0.11 0.12 0.40 1.15 0.51 0.13 0.14 0.55 0.25 0.11 0.08 0.34 1.33 3.55 0.84 10.12 10.12 1 SS 0.08 0.00 0.01 0.05 0.06 0.14 0.00 0.02 0.27 0.19 0.11 0.07 0.22 0.23 0.29 0.09 1.84 1.84 2 MS 0.00 0.01 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 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 16.06 EU 0.00 0.00 0.00 0.00 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.07 0.04 0.12 0.12 1 MU 0.00 0.00 0.00 0.00 0.00 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.02 0.07 0.00 0.11 0.11 3 SU 0.00 0.00 0.00 0.00 0.00 0.02 0.00 0.00 0.01 0.00 0.00 0.00 0.00 0.05 0.15 0.05 0.28 0.28

- N 0.02 0.00 0.00 0.00 0.18 0.28 0.01 0.00 0.01 0.02 0.00 0.00 0.04 0.44 1.29 0.32 2.61 2.61 1 SS 0.01 0.07 0.01 0.00 0.00 0.00 0.00 0.00 0.01 0.00 0.00 0.00 0.01 0.12 0.05 0.01 0.29 0.29 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 3.41 Page 103

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, 2011 Limerick Tower 1 January-December, 2011 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 0.01 0.00 0.00 0.01 0.01 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 0.00 0.05 0.00 0.05 0.05

- N 0.00 0.00 0.00 0.00 0.00 0.01 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.21 0.02 0.27 0.27 2 SS 0.00 0.02 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 0.02 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 0.35 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 0.00 0.00 0.00 0.00 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 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 0.00 TOT 4.70 3.41 3.67 5.02 5.77 3.62 2.60 3.10 6.16 6.52 5.21 5.76 7.93 13.20 16.84 5.98 99.74 6.27 4.15 5.52 38.79 27.03 9.80 8.17 99.74 Wind Direction by Stability N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL -STABILITY CLASSES-0.16 0.18 0.06 0.02 0.07 0.08 0.11 0.12 0.36 1.04 0.69 0.89 0.67 0.80 0.87 0.16 6.27 Extremely Unstable 0.18 0.15 0.07 0.05 0.09 0.11 0.08 0.07 0.22 0.35 0.29 0.37 0.34 0.51 0.91 0.35 4.15 Moderately Unstable 0.28 0.07 0.08 0.13 0.25 0.19 0.12 0.19 0.41 0.56 0.26 0.28 0.37 0.64 1.30 0.39 5.52 Slightly Unstable 1.97 1.32 1.93 2.88 3.76 1.94 1.08 1.16 2.09 1.60 1.30 1.15 1.66 4.13 8.27 2.52 38.79 Neutral 0.94 0.95 0.95 1.21 1.08 0.90 0.94 1.19 2.72 2.22 1.85 1.88 2.67 3.64 2.72 1.12 27.03 Slightly Stable 0.53 0.34 0.21 0.43 0.29 0.29 0.19 0.30 0.23 0.55 0.66 0.84 1.18 1.70 1.32 0.63 9.80 Moderately Stable 0.66 0.40 0.37 0.30 0.23 0.11 0.09 0.07 0.12 0.19 0.16 0.34 1.04 1.78 1.45 0.81 8.17 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 0.26 C A L M 2.13 1.79 1.88 2.42 1.94 1.23 1.18 1.21 1.50 1.80 2.55 3.23 4.65 5.57 4.26 2.66 40.00 < 3.5 mph 1.67 1.35 1.63 2.14 2.34 1.32 1.26 1.69 3.46 3.79 2.35 2.15 2.47 4.96 5.41 1.67 39.67 3.6 - 7.5 mph 0.87 0.18 0.15 0.46 1.30 0.74 0.13 0.21 1.16 0.90 0.30 0.37 0.77 2.01 5.29 1.22 16.06 7.6 - 12.5 mph 0.04 0.07 0.01 0.00 0.19 0.32 0.01 0.00 0.04 0.02 0.00 0.00 0.05 0.63 1.63 0.41 3.41 12.6 - 18.5 mph 0.00 0.02 0.00 0.00 0.00 0.01 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.02 0.26 0.02 0.35 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 0.00 0.00 0.00 > 24.5 mph Page 104

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, 2011 Limerick Tower 1 January-December, 2011 175 ft. Wind Speed and Direction 171Ft-26Ft Delta-T (F)

Number of Observations = 8696 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 0.01 0.01 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 0.06 0.06 0.07 EU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.02 0.00 0.02 0.00 0.01 0.00 0.00 0.06 0.06 MU 0.00 0.00 0.01 0.02 0.00 0.00 0.01 0.00 0.00 0.02 0.06 0.01 0.00 0.02 0.00 0.00 0.16 0.16 1 SU 0.02 0.03 0.00 0.00 0.05 0.01 0.01 0.03 0.00 0.05 0.00 0.03 0.03 0.05 0.01 0.01 0.34 0.34

- N 0.15 0.26 0.33 0.30 0.26 0.30 0.15 0.15 0.11 0.08 0.26 0.15 0.17 0.24 0.13 0.11 3.17 3.17 3 SS 0.17 0.18 0.25 0.33 0.37 0.28 0.18 0.11 0.06 0.11 0.15 0.09 0.16 0.23 0.15 0.20 3.04 3.04 MS 0.20 0.08 0.06 0.20 0.09 0.21 0.06 0.14 0.07 0.07 0.07 0.07 0.17 0.25 0.21 0.17 2.10 2.10 ES 0.16 0.09 0.08 0.11 0.10 0.14 0.18 0.10 0.11 0.10 0.17 0.16 0.22 0.18 0.38 0.21 2.52 2.52 11.40 EU 0.10 0.10 0.03 0.02 0.01 0.02 0.07 0.02 0.11 0.20 0.18 0.21 0.26 0.09 0.07 0.02 1.54 1.54 MU 0.03 0.08 0.05 0.01 0.06 0.03 0.08 0.05 0.06 0.18 0.08 0.15 0.16 0.16 0.06 0.06 1.30 1.30 4 SU 0.01 0.03 0.05 0.11 0.13 0.05 0.08 0.08 0.20 0.18 0.15 0.17 0.17 0.24 0.15 0.05 1.85 1.85

- N 0.59 0.54 0.85 1.21 0.91 0.60 0.45 0.46 0.64 0.46 0.48 0.45 0.32 0.75 0.60 0.40 9.71 9.71 7 SS 0.43 0.18 0.31 0.51 0.33 0.36 0.37 0.54 0.89 0.74 0.77 0.85 0.61 1.13 0.79 0.32 9.12 9.12 MS 0.23 0.21 0.06 0.10 0.08 0.11 0.14 0.14 0.18 0.34 0.44 0.39 0.60 1.05 0.59 0.18 4.84 4.84 ES 0.16 0.03 0.05 0.06 0.08 0.08 0.05 0.06 0.20 0.33 0.33 0.37 0.49 1.36 1.07 0.28 4.99 4.99 33.35 EU 0.08 0.05 0.02 0.00 0.00 0.00 0.03 0.05 0.14 0.56 0.39 0.34 0.49 0.48 0.15 0.02 2.82 2.82 MU 0.15 0.07 0.01 0.00 0.00 0.05 0.01 0.01 0.11 0.08 0.14 0.16 0.08 0.26 0.39 0.18 1.71 1.71 8 SU 0.11 0.06 0.01 0.02 0.01 0.03 0.03 0.03 0.14 0.25 0.09 0.08 0.13 0.24 0.36 0.07 1.68 1.68

- N 0.77 0.60 0.49 0.97 1.32 0.72 0.48 0.52 0.90 0.80 0.49 0.47 0.52 2.00 1.84 0.90 13.80 13.80 1 SS 0.37 0.37 0.20 0.18 0.25 0.23 0.26 0.57 1.44 1.35 0.89 0.68 0.70 1.94 1.03 0.56 11.03 11.03 2 MS 0.05 0.08 0.03 0.00 0.08 0.05 0.01 0.03 0.07 0.32 0.29 0.21 0.17 0.98 0.51 0.07 2.94 2.94 ES 0.03 0.03 0.00 0.00 0.01 0.02 0.00 0.01 0.02 0.09 0.11 0.16 0.06 0.52 0.41 0.00 1.49 1.49 35.48 EU 0.00 0.02 0.00 0.00 0.05 0.03 0.00 0.00 0.08 0.25 0.17 0.30 0.17 0.16 0.26 0.01 1.52 1.52 1 MU 0.01 0.00 0.00 0.00 0.01 0.01 0.01 0.00 0.03 0.08 0.06 0.10 0.11 0.09 0.21 0.01 0.75 0.75 3 SU 0.11 0.00 0.00 0.00 0.00 0.06 0.00 0.00 0.06 0.14 0.01 0.06 0.03 0.29 0.33 0.07 1.16 1.16

- N 0.25 0.10 0.06 0.13 0.68 0.60 0.18 0.14 0.44 0.36 0.13 0.29 0.34 1.69 2.28 0.62 8.28 8.28 1 SS 0.03 0.03 0.00 0.02 0.08 0.14 0.08 0.06 0.47 0.30 0.33 0.37 0.30 0.61 0.28 0.05 3.15 3.15 8 MS 0.01 0.00 0.00 0.00 0.01 0.02 0.00 0.00 0.01 0.01 0.02 0.01 0.00 0.10 0.02 0.00 0.23 0.23 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 0.08 0.00 0.00 0.09 0.09 15.18 Page 105

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, 2011 Limerick Tower 1 January-December, 2011 175 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 0.05 0.02 0.02 0.03 0.02 0.08 0.00 0.23 0.23 1 MU 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 0.07 0.02 0.01 0.14 0.14 9 SU 0.00 0.00 0.00 0.00 0.00 0.01 0.00 0.00 0.03 0.01 0.03 0.02 0.02 0.07 0.10 0.03 0.34 0.34

- N 0.02 0.00 0.00 0.00 0.06 0.21 0.07 0.01 0.07 0.06 0.07 0.09 0.08 0.66 0.72 0.22 2.33 2.33 2 SS 0.01 0.02 0.01 0.00 0.00 0.00 0.00 0.00 0.02 0.06 0.08 0.08 0.03 0.06 0.00 0.00 0.38 0.38 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 3.43 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 0.01 0.00 0.01 0.00 0.00 0.02 0.02 T SU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.00 0.02 0.01 0.01 0.06 0.06 N 0.00 0.00 0.00 0.00 0.00 0.02 0.02 0.00 0.01 0.00 0.00 0.00 0.05 0.31 0.26 0.05 0.72 0.72 2 SS 0.00 0.06 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.03 0.10 0.01 0.01 0.23 0.23 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 1.03 TOT 4.28 3.33 2.98 4.31 5.04 4.39 3.04 3.32 6.68 7.69 6.49 6.61 6.76 16.54 13.49 4.91 99.93 6.16 4.08 5.44 38.03 26.94 10.12 9.15 99.93 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 0.17 0.06 0.02 0.06 0.06 0.10 0.07 0.33 1.08 0.77 0.90 0.97 0.77 0.56 0.06 6.16 Extremely Unstable 0.20 0.15 0.07 0.03 0.07 0.09 0.11 0.06 0.21 0.38 0.33 0.45 0.37 0.62 0.68 0.26 4.08 Moderately Unstable 0.26 0.13 0.06 0.14 0.18 0.16 0.13 0.15 0.43 0.63 0.29 0.38 0.39 0.91 0.97 0.24 5.44 Slightly Unstable 1.78 1.51 1.74 2.60 3.23 2.45 1.36 1.28 2.17 1.76 1.44 1.45 1.48 5.65 5.83 2.30 38.03 Neutral 1.01 0.85 0.78 1.05 1.03 1.00 0.90 1.29 2.87 2.55 2.22 2.07 1.84 4.07 2.27 1.14 26.94 Slightly Stable 0.48 0.37 0.15 0.30 0.26 0.39 0.21 0.31 0.33 0.75 0.82 0.68 0.94 2.38 1.32 0.43 10.12 Moderately Stable 0.36 0.16 0.13 0.17 0.20 0.24 0.23 0.17 0.33 0.54 0.62 0.69 0.77 2.14 1.86 0.48 9.15 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 0.07 C A L M 0.70 0.66 0.74 0.97 0.87 0.93 0.60 0.54 0.36 0.46 0.71 0.54 0.76 0.99 0.87 0.70 11.40 < 3.5 mph 1.55 1.18 1.39 2.02 1.60 1.25 1.23 1.35 2.28 2.44 2.44 2.59 2.62 4.77 3.32 1.31 33.35 3.6 - 7.5 mph 1.56 1.25 0.77 1.17 1.68 1.10 0.84 1.23 2.82 3.46 2.40 2.10 2.15 6.43 4.69 1.81 35.48 7.6 - 12.5 mph 0.43 0.16 0.06 0.15 0.83 0.86 0.28 0.20 1.09 1.15 0.72 1.13 0.97 3.02 3.38 0.76 15.18 12.6 - 18.5 mph 0.03 0.02 0.01 0.00 0.06 0.22 0.07 0.01 0.13 0.18 0.21 0.23 0.18 0.87 0.93 0.26 3.43 18.6 - 24.5 mph 0.00 0.06 0.01 0.00 0.00 0.02 0.02 0.00 0.01 0.00 0.00 0.02 0.08 0.45 0.29 0.07 1.03 > 24.5 mph Page 106

SITE: LIMERICK GENERATING STATION - UNITS 1 & 2 LICENSEE: EXELON GENERATION COMPANY, LLC Table D - 11 Annual x/Q and D/Q values for the North Stack, Limerick Generating Station, 2011 Limerick Generating Station x/Q and D/Q values North Stack - Flow = 251200 cfm X/Q (s/m^3) D/Q (1/m^2)

Stack ID Location Direction Range (m) Undepleted N Site Boundary S 762 1.04E-07 1.28E-09 N Site Boundary SSW 762 7.12E-08 9.80E-10 N Site Boundary SW 884 5.35E-08 5.52E-10 N Site Boundary WSW 854 8.23E-08 7.79E-10 N Site Boundary W 854 1.37E-07 1.65E-09 N Site Boundary WNW 793 1.13E-07 1.54E-09 N Site Boundary NW 762 5.45E-08 6.41E-10 N Site Boundary NNW 884 6.29E-08 6.74E-10 N Site Boundary N 884 1.58E-07 1.84E-09 N Site Boundary NNE 793 1.81E-07 2.62E-09 N Site Boundary NE 793 1.02E-07 1.60E-09 N Site Boundary ENE 793 9.67E-08 1.77E-09 N Site Boundary E 762 1.39E-07 2.05E-09 N Site Boundary ESE 762 3.44E-07 4.65E-09 N Site Boundary SE 762 6.24E-07 9.73E-09 N Site Boundary SSE 1006 1.14E-07 1.69E-09 N RR-Inf-Lck-NG S 300 4.19E-07 4.00E-09 N RR-Inf-Lck-NG SSW 225 4.93E-07 4.11E-09 N RR-Inf-Lck-NG SW 225 4.45E-07 2.72E-09 N RR-Inf-Lck-NG WSW 345 3.14E-07 2.43E-09 N RR-Inf-Lck-NG W 225 1.13E-06 9.97E-09 N RR-Inf-Lck-NG WNW 345 3.87E-07 4.85E-09 N RR-Inf-Lck-NG NW 450 1.13E-07 1.17E-09 N RR-Inf-Lck-NG ESE 884 2.86E-07 3.86E-09 N RR-Inf-Lck-NG WSW 450 1.97E-07 1.70E-09 N RR-Inf-Lck-NG NNE 682 2.17E-07 3.08E-09 N Inhalation N 948 1.45E-07 1.69E-09 N Inhalation NNE 825 1.73E-07 2.50E-09 N Inhalation NE 1057 7.38E-08 1.19E-09 N Inhalation ENE 985 7.66E-08 1.41E-09 N Inhalation E 873 1.19E-07 1.77E-09 N Inhalation ESE 1047 2.34E-07 3.14E-09 N Inhalation SE 1557 2.82E-07 3.93E-09 N Inhalation SSE 1647 7.37E-08 9.73E-10 N Inhalation S 1325 5.76E-08 7.48E-10 N Inhalation SSW 1543 3.62E-08 4.83E-10 N Inhalation SW 991 4.64E-08 5.08E-10 N Inhalation WSW 1158 5.80E-08 6.36E-10 N Inhalation W 1105 1.02E-07 1.26E-09 N Inhalation WNW 1198 6.90E-08 9.21E-10 Page 107

SITE: LIMERICK GENERATING STATION - UNITS 1 & 2 LICENSEE: EXELON GENERATION COMPANY, LLC Table D - 11 Annual x/Q and D/Q values for the North Stack, Limerick Generating Station, 2011 Limerick Generating Station x/Q and D/Q values North Stack - Flow = 251200 cfm X/Q (s/m^3) D/Q (1/m^2)

Stack ID Location Direction Range (m) Undepleted N Inhalation NW 1104 3.59E-08 4.48E-10 N Inhalation NNW 1540 3.85E-08 4.11E-10 N Vegetation N 1017 1.34E-07 1.57E-09 N Vegetation NNE 2929 7.40E-08 4.96E-10 N Vegetation NE 1065 7.32E-08 1.18E-09 N Vegetation ENE 4561 5.72E-08 1.98E-10 N Vegetation E 3849 8.01E-08 2.95E-10 N Vegetation ESE 555 5.31E-07 6.98E-09 N Vegetation SE 390 1.60E-06 2.41E-08 N Vegetation SSE 2102 6.53E-08 7.15E-10 N Vegetation S 1860 4.83E-08 5.46E-10 N Vegetation SSW 1622 3.55E-08 4.56E-10 N Vegetation SW 1390 3.36E-08 4.49E-10 N Vegetation WSW 3662 5.77E-08 2.70E-10 N Vegetation W 1283 8.90E-08 1.12E-09 N Vegetation WNW 1198 6.90E-08 9.21E-10 N Vegetation NW 2490 2.89E-08 2.10E-10 N Vegetation NNW 2166 3.69E-08 2.80E-10 N Meat N 7551 4.78E-08 1.17E-10 N Meat ENE 6264 5.25E-08 1.23E-10 N Meat SE 3331 1.74E-07 1.39E-09 N Meat S 6741 3.55E-08 1.06E-10 N Meat SSW 3167 3.44E-08 2.05E-10 N Meat SW 5653 3.71E-08 1.12E-10 N Meat WSW 4321 5.67E-08 2.22E-10 N Meat W 4467 5.96E-08 3.05E-10 N Cow N 7551 4.78E-08 1.17E-10 N Cow S 6741 3.55E-08 1.06E-10 N Cow SSW 3167 3.44E-08 2.05E-10 N Cow WSW 4321 5.67E-08 2.22E-10 N Cow W 4467 5.96E-08 3.05E-10 Page 108

SITE: LIMERICK GENERATING STATION - UNITS 1 & 2 LICENSEE: EXELON GENERATION COMPANY, LLC Table D - 12 Annual x/Q and D/Q values for the Sout Stack, Limerick Generating Station, 2011 Limerick Generating Station x/Q and D/Q values South Stack - Flow = 177200 cfm X/Q (s/m^3) D/Q (1/m^2)

Stack ID Location Direction Range (m) Undepleted S Site Boundary S 762 6.30E-08 9.49E-10 S Site Boundary SSW 762 3.90E-08 7.18E-10 S Site Boundary SW 884 2.27E-08 3.77E-10 S Site Boundary WSW 854 3.85E-08 5.09E-10 S Site Boundary W 854 7.57E-08 1.14E-09 S Site Boundary WNW 793 6.10E-08 9.90E-10 S Site Boundary NW 762 2.49E-08 4.51E-10 S Site Boundary NNW 884 3.38E-08 4.93E-10 S Site Boundary N 884 8.94E-08 1.37E-09 S Site Boundary NNE 793 1.12E-07 2.14E-09 S Site Boundary NE 793 6.26E-08 1.33E-09 S Site Boundary ENE 793 6.57E-08 1.53E-09 S Site Boundary E 762 8.67E-08 1.64E-09 S Site Boundary ESE 762 1.89E-07 3.26E-09 S Site Boundary SE 762 3.66E-07 6.85E-09 S Site Boundary SSE 1006 7.44E-08 1.29E-09 S RR-Inf-Lck-NG S 300 2.28E-07 2.48E-09 S RR-Inf-Lck-NG SSW 225 2.33E-07 2.30E-09 S RR-Inf-Lck-NG SW 225 1.53E-07 1.20E-09 S RR-Inf-Lck-NG WSW 345 1.36E-07 1.28E-09 S RR-Inf-Lck-NG W 225 5.81E-07 5.46E-09 S RR-Inf-Lck-NG WNW 345 1.90E-07 2.54E-09 S RR-Inf-Lck-NG NW 450 4.58E-08 7.12E-10 S RR-Inf-Lck-NG ESE 884 1.63E-07 2.80E-09 S RR-Inf-Lck-NG WSW 450 8.57E-08 9.29E-10 S RR-Inf-Lck-NG NNE 682 1.29E-07 2.46E-09 S Inhalation N 948 8.41E-08 1.28E-09 S Inhalation NNE 825 1.07E-07 2.06E-09 S Inhalation NE 1057 4.97E-08 1.03E-09 S Inhalation ENE 985 5.55E-08 1.26E-09 S Inhalation E 873 7.69E-08 1.44E-09 S Inhalation ESE 1047 1.42E-07 2.39E-09 S Inhalation SE 1557 2.17E-07 3.31E-09 S Inhalation SSE 1647 6.08E-08 8.42E-10 S Inhalation S 1325 4.25E-08 6.32E-10 S Inhalation SSW 1543 2.79E-08 4.11E-10 S Inhalation SW 991 2.08E-08 3.66E-10 S Inhalation WSW 1158 3.23E-08 4.81E-10 S Inhalation W 1105 6.30E-08 9.56E-10 S Inhalation WNW 1198 4.37E-08 6.88E-10 S Inhalation NW 1104 1.96E-08 3.51E-10 Page 109

SITE: LIMERICK GENERATING STATION - UNITS 1 & 2 LICENSEE: EXELON GENERATION COMPANY, LLC Table D - 12 Annual x/Q and D/Q values for the Sout Stack, Limerick Generating Station, 2011 Limerick Generating Station x/Q and D/Q values South Stack - Flow = 177200 cfm X/Q (s/m^3) D/Q (1/m^2)

Stack ID Location Direction Range (m) Undepleted S Inhalation NNW 1540 2.87E-08 3.48E-10 S Vegetation N 1017 7.96E-08 1.21E-09 S Vegetation NNE 2929 7.28E-08 4.57E-10 S Vegetation NE 1065 4.94E-08 1.02E-09 S Vegetation ENE 4561 6.18E-08 1.90E-10 S Vegetation E 3849 8.57E-08 2.78E-10 S Vegetation ESE 555 2.75E-07 4.52E-09 S Vegetation SE 390 8.58E-07 1.46E-08 S Vegetation SSE 2102 5.99E-08 6.41E-10 S Vegetation S 1860 4.28E-08 4.89E-10 S Vegetation SSW 1622 2.82E-08 3.91E-10 S Vegetation SW 1390 2.05E-08 3.75E-10 S Vegetation WSW 3662 6.15E-08 2.58E-10 S Vegetation W 1283 6.06E-08 8.99E-10 S Vegetation WNW 1198 4.37E-08 6.88E-10 S Vegetation NW 2490 2.83E-08 1.92E-10 S Vegetation NNW 2166 3.41E-08 2.48E-10 S Meat N 7551 4.92E-08 1.11E-10 S Meat ENE 6264 5.65E-08 1.19E-10 S Meat SE 3331 1.70E-07 1.29E-09 S Meat S 6741 3.80E-08 1.03E-10 S Meat SSW 3167 3.56E-08 1.87E-10 S Meat SW 5653 3.99E-08 1.09E-10 S Meat WSW 4321 6.07E-08 2.14E-10 S Meat W 4467 6.24E-08 2.93E-10 S Cow N 7551 4.92E-08 1.11E-10 S Cow S 6741 3.80E-08 1.03E-10 S Cow SSW 3167 3.56E-08 1.87E-10 S Cow WSW 4321 6.07E-08 2.14E-10 S Cow W 4467 6.24E-08 2.93E-10 Page 110