ML13127A029

2012 Annual Radioactive Effluent Release Report No. 38, Attachment 1

ML13127A029
Person / Time
Site:	Limerick
Issue date:	12/31/2012
From:	Exelon Nuclear, Exelon Generation Co
To:	Office of Nuclear Reactor Regulation, Office of Nuclear Material Safety and Safeguards
References
Download: ML13127A029 (103)

Text

ATTACHMENT 1 2012 ANNUAL RADIOACTIVE EFFLUENT RELEASE REPORT NO. 38 FOR LGS

Exelkn Nuclear Annual Radioactive Effluent Release Report No. 38 2012 Limerick Generating Station

SITE: LIMERICK GENERATING STATION - UNITS I & 2 LICENSEE: EXELON GENERATION COMPANY, LLC ANNUAL RADIOACTIVE EFFLUENT RELEASE REPORT NO. 38 January 1, 2012 through December 31, 2012 EXELON GENERATION COMPANY, LLC LIMERICK GENERATING STATION UNITS NO. 1 AND 2 DOCKET NO. 50-352 (Unit 1)

DOCKET NO. 50-353 (Unit 2)

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

NPF-39 (Unit 1)

NPF-85 (Unit 2)

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

1. Introduction 1

2. Supplemental Information 1 A Regulatory Limits 1 B Effluent Concentration Limits 2 C Average Energy (i) 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 6 I Radioactive Effluent Monitoring Instrumentation Out of Service for More Than 30 Days 6 J Independent Spent Fuel Storage Installation (ISFSI) 6 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 - Meteorological Data 25 Appendix D - ODCM Change Summary 93 Pagei

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SITE: LIMERICK GENERATING STATION - UNITS I & 2 LICENSEE: EXELON GENERATION COMPANY, LLC 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, 2012 through December 31, 2012. 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 2012 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 mremlYr 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 10 CFR 50, Appendix I, Section (Gamma) II.B.2(b) (limits listed here are

< 30 mrem Skin (Beta) based on two unit operation)

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

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

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

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

3. Liquid Effluents

a. 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 I & 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 Offsite Dose Calculation Manual (ODCM) Controls 3.2.2.1 .a and 3.2.2. I.b as 500 mremlyr (Total Body), 3000 mrem/yr (Skin), and 1500 mrem/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 ODCM Control 3.2.1.1. The total activity concentration for all dissolved or entrained gases was limited to < 2E-04 jaCi/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 lodines The method used for Gamma Isotopic Analysis is the Canberra Gamma Spectroscopy System with a particulate filter (47 mm) or charcoal cartridge, respectively. Particulate Page 2

SITE: LIMERICK GENERATING STATION - UNITS 1 & 2 LICENSEE: EXELON GENERATION COMPANY, LLC and iodine activity was continuously sampled and analyzed in accordance with ODCM Table 4.2-2. Charcoal and particulate samples are taken from the North Stack, Unit 1 South Stack, Unit 2 South Stack and the Hot Maintenance Shop exhausts and analyzed 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 0-17(n,a) 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,a)

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 the form of 14 CO 2 .

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 32.87 Curies (Ci). Ninety-five percent or 32.33 Ci was in the form of 14C0 2, 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 XIQ 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 Liquid effluents are analyzed for tritium using a Liquid Scintillation Counter.

Gaseous effluents are analyzed for tritium by passing air from stack effluents through two bubblers in series. 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:

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

Noble Gas (Kr-87, Kr-88, Xe-133, Xe-133m, Xe-135, Xe-135m, Xe-138) iE-04 uCi/cc Liquid: LLD Principal Gamma Emitters (Mn-54, Fe-59, Co-58, Co-60, Zn-65, Mo-99, 5E-07 uCi/mI Cs-134, Cs-137, Ce-141, Ce-144) 1-131 1E-06 uCi/mI Entrained Gases (Kr-87, Kr-88, Xe-1 33, Xe-1 33m, Xe-135, Xe-1 35m, 1E-05 uCi/mI Xe-138)

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

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 I Qtr 2 Qtr 3 Qtr 4 Total Number of Batch Releases 2.20E+01 2.10E+01 1.10E+01 2.00E+00 5.60E+01 Total time period for batch releases (min) 2.11E+03 1.95E+03 9.23E+02 2.14E+02 5.21E+03 Maximum time period for batch release (min) 1.13E+02 1.15E+02 1.07E+02 1.10E+02 1.15E+02 Average time period for batch release (min) 9.61E+01 9.30E+01 8.39E+01 1.07E+02 9.29E+01 Minimum time period for batch release (min) 7.50E+01 7.OOE+01 5.OOE+00 1.04E+02 5.00E+00 Average stream flow (Schuylkill River) during periods of release of effluents into a flowing 2.23E+04 2.15E+04 2.13E+04 2.04E+04 2.17E+04 stream (Lpm)

Gaseous Qtr I Qtr 2 Qtr 3 Qtr 4 Total Number of Batch Releases O.OOE+00 0.OOE+00 1.OOE+00 1.OOE+00 2.OOE+00 Total time perod for batch releases (min) 0.OOE+00 0.OOE+00 1.01E+04 1.87E+04 2.88E+04 Maximum time period for batch release (min) 0.OOE+00 0.OOE+00 1.01E+04 1.87E+04 1.87E+04 Average time period for batch release (min) 0.OOE+00 0.OOE+00 1.01E+04 1.87E+04 1.44E+04 Minimum time period for batch release (min) 0.OOE+00 O.00E+001 1.01E+04 1.87E+04 1.01E+04 Page 4

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

1. Liquid Qtr I Qtr 2 Qtr 3 Qtr 4 Total Number of Releases 1.OOE+00 O.OOE+00 1.OOE+00 O.OOE+00 2.00E+00 Total Activity Released (Ci) 2.48E-01 0.00E+00 4.20E-06 0.OOE+00 2.48E-01

2. Gaseous Qtr I Qtr 2 Qtr 3 Qtr 4 Total Number of Releases 0.OOE+00 0.00E+00 O.OOE+00 1.00E+00 1.OOE+00 Total Activity Released (Ci) 0.00E+00 O.OOE+00 0.00E+00 3.10E-04 3.10E-04 On March 19, 2012 water was observed overflowing from the Cooling Tower Blowdown Line emergency relief top hat. Concurrently, a tank of contaminated water was being released via the approved pathway to the Schuylkill River. The overflowed water traveled into Possum Hollow Creek and then to the Schuylkill River. The initial sample taken showed only tritium, at a concentration of 112,000 pCi/L. The area was remediated on 3/20/12 by pumping out the standing water and removing the sludge and silt in the nearby ditch where water had accumulated.

A bounding dose calculation was performed. The maximum daily organ dose from the 3/19/2012 release to Possum Hollow was 0.175 mrem to a child liver. The maximum daily total body dose to a child was 0.123 mrem. This calculation was based upon the following assumptions:

1. Reg Guide 1.109 equation D-1 methodology was used.

2. A dilution factor of 30 was used for cooling tower dilution.

3. Drinking Water and Fish dose calculated at LGS Discharge (same location as Possum Hollow).

4. 1 day exposure (2 L drinking water consumption, 0.5 kg fish consumption).

The resulting calculations were both less than 10 % of the Appendix I Annual dose limits of 20 mrem organ dose and 6 mrem total body dose.

This issue is documented in the following IRs: 1342540, 1344180, 1347829, 1342884, 1350714.

" On July 15, 2012, tritium was identified in the U1 Turbine Plenum and was pumped to the Hold Pond for release through the normal discharge pathway. The tritium concentration identified was 1.85E-05 uCi/mI. This issue is documented in IR 1392419.

" On November 7, 2012, tritium was identified in the Auxiliary Boiler Dearator at a concentration of 8770 pCi/L. Samples obtained November 21, 2012 and all subsequent samples showed <LLD. The tritium came from the steam heating coils of one of the three storage tanks. There was slight weepage through one the heating coil welds which allowed a buildup of the storage tank fluid in the heating coil during the summer months when the heating coils were out of service. When the heating coils were placed in service in November, the small about of tank fluid was carried back to the deaerator. The effluent pathway from the dearator would be a gaseous release out the dearator vent. The entire issue was documented in IR 1442976.

G. Spills There was one spill to ground containing radioactive material in 2012. This event was the overflow from the Cooling Tower Blowdown Line emergency relief top hat. The event on 3/19/12 is described in section F. Abnormal Releases.

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SITE: LIMERICK GENERATING STATION - UNITS 1 & 2 LICENSEE: EXELON GENERATION COMPANY, LLC H. Revisions to the ODCM Revision 26 of the Offsite Dose Calculation Manual (CY-LG-170-301) was approved by PORC and signed by the Plant Manager in March 2013. A complete legible copy of the new revision, along with detailed information justifying the changes, a determination that the changes did not reduce the accuracy or reliability of dose calculations or setpoint determination, and documentation of review and approval is included in this report.

The majority of the changes were administrative in nature. Appendix D includes a summary of all changes. The following is a summary of the significant changes:

1. Added an Applicability column in Table 3.1-1, Radioactive Liquid Effluent Monitoring Instrumentation, for action to take when less than the minimum number of radiation monitor channels are operable.

2. Revised wording of Action 101 in Table 3.1-1, Radioactive Liquid Effluent Monitoring Instrumentation, to match the standard wording that is in NUREG 1302.

3. Adjusted the midpoint of the facility operating life due to license extension.

4. Updated the X/Q and D/Q values for the garden pathway.

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 2012.

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 2012 the dose to the nearest resident to the ISFSI was zero, using environmental dosimeters from the Radiological Environmental Monitoring Program.

K. Significant Events Gross alpha is performed monthly on a Liquid Waste Release composite. A positive activity was identified on the July composite sample. Transuranics were performed with all results of less than the lower limit of detection. Gross alpha was not identified in any subsequent samples.

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:

a 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.

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

• 100 percent occupancy factor was assumed.

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

• 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.

Gaseous Releases:

The critical age-organ group was the child-bone. Calculated dose was 6.28E-01 mrem, which represents 2.09 percent of the allowable limits. Carbon-14 represented 99.9 % or 6.28E-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 8.09E-02 and 8.09E-02 mrem, respectively.

40 CFR 190 Compliance:

The maximum calculated dose to a real individual would not exceed 2.12E-01 mrem (total body), 7.13E-01 mrem (organ), or 2.12 E-01 mrem (thyroid).

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

Table 1 Summary of Gaseous and Liquid Effluent Doses to Members of the Public at the Highest Dose Receptors and 40CFRI90 Compliance Maximum Individual Applicable Estimated Age  % of Limit Unit Noble Gas Dose Dose Group Applicable Limit Nearest Residence Gamma Air Dose 4.69E-03 All 2.35E-02 20 mRad Nearest Residence Beta Air Dose 3.02E-03 All 7.55E-03 40 mRad Nearest Residence Total Body 4.45E-03 All 4.45E-02 10 mrem Nearest Residence Skin 7.47E-03 All 2.49E-02 30 mrem Iodine, Particulate, C-14 &

Tritium Vegetation Pathway Bone 6.28E-01 Child 2.09E+00 30 mrem Liquid Phoenixville, PA Total Body 8.09E-02 Child 1.35E+00 6 mrem Phoenixville, PA Liver 8.09E-02 Child 4.05E-01 20 mrem 40 CFR 190 Compliance Gaseous Effluents  % of Noble Particulate, Liquid Net Direct Total Applicable Limit Unit Gas Iodine, C-14 Effluents Radiation Limit

& Tritium Total Body Dose 4.45E-03 1.27E-01 8.09E-02 0.OOE+00 2.12E-01 8.49E-01 25 mrem Organ Dose 4.45E-03 6.28E-01 8.09E-02 0.OOE+00 7.13E-01 2.85E-00 25 mrem Thyroid Dose 4.45E-03 1.27E-01 8.08E-02 0.OOE+00 2.12E-01 2.83E-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 Page 7

SITE: LIMERICK GENERATING STATION - UNITS I & 2 LICENSEE: EXELON GENERATION COMPANY, LLC 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 sectors encompassing 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.

The maximum calculated dose for activities on site was 3.57E-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, Approx. X/Q D/Q mrem(') mrem(')

Location Sector Distance S/mA3 l/mA2 Iodine, Iodine, Total (meters) Noble Gas Particulate, Particulate, C-14 & H-3 C-14 & H-3 R.R. Tracks W 225 2.66E-06 2.36E-08 5.14E-03 5.63E-03 2.49E-02 3.57E-02 Info. Center ESE 884 7.32E-07 9.27E-09 1.42E-03 1.55E-03 6.84E-03 9.81 E-03 Frick's Lock WSW 450 5.58E-07 4.78E-09 1.08E-03 1.18E-03 5.21E-03 7.47E-03 Security NNE 682 4.OOE-07 4.43E-09 7.72E-04 5.18E-04 1.89E-03 3.18E-03 Check Point r m I Ih I (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 I & 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 IA GASEOUS EFFLUENTS - SUMMATION OF ALL RELEASES 13 TABLE 1B-1 GASEOUS EFFLUENTS-GROUND-LEVEL RELEASE-BATCH MODE 16 TABLE 1B-2 GASEOUS EFFLUENTS - GROUND LEVEL RELEASE - CONTINUOUS MODE 15 TABLE 2A 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 I & 2 LICENSEE: EXELON GENERATION COMPANY, LLC TABLE 1A GASEOUS EFFLUENTS - SUMMATION OF ALL RELEASES PERIOD 2012 A. Fission And Activation Uncertainty Gasses Units Qtr 1 Qtr 2 Qtr 3 Qtr 4 Total Total Release Ci 2.31 E+01 1.99E+01 3.51E+00 2.51 E+01 7.16E+01 36.6 Average ReleaeoRate for uCi/sec 2.93E+00 2.52+00 4.46E-01 3.19E+00 2.27E+00 Period ____ ____ ____ ____

Dose - Gamma Air Dose mrad 8.13E-04 1.23E-03 2.33E-04 2.41E-03 4.69E-03

- Beta Air Dose mrad 7.30E-04 7.48E-04 1.40E-04 1.40E-03 3.02E-03 Percent of ODCM Limit

- Gamma Air Dose  % 8.13E-03 1.23E-02 2.33E-03 2.41E-02 2.35E-02

- Beta Air Dose  % 3.65E-03 3.74E-03 7.02E-04 7.01E-03 7.55E-03 B. Radlolodlnes Units Qtr I Qtr 2 Qtr 3 Qtr 4 Total Uncertainty Total Release Ci 1.04E-04 3.11 E-05 < LLD < LLD 1.35E-04 20.4 Average Release Rate for uCi/sec 1.32E-05 3.94E-06 < LLD < LLD 4.29E-06 Period I_________ _____ _ _ _ _

Percent of ODCM Limit  %* * * *

• C. Partlculates Units Qtr I Qtr 2 Qtr 3 Qtr 4 Total Uncertainty Total Release Ci < LLD < LLD 6.60E-1 I < LLD 6.60E-1 1 22.6 Average Release Rate for uCi/sec < LLD < LLD 8.37E-12 < LLD 2.09E-12 Period__ _ _ _ _ _ _ _ __ _ _ _ _____ _ _ _ _

Percent of ODCM Limit  % .....

D. Gross Alpha Units Qtr I Qtr 2 Qtr 3 Qtr 4 Total Uncertainty

___ ___ __ _ __ ___(%)

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

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

(%)

Total Release Ci 3.21E+01 1.06E+01 1.30E+01 1.60E+01 7.16E+01 15.7 Average Release Rate for i/e Period uCi/sec 4.07E+00 1.34E+00 1.64E+00 2.03E+00 2.27E+00 Percent of ODCM Limit  %* * * *

• F. Carbon-14 Units Qtr I Qtr 2 Qtr 3 Qtr 4 Total Total Release Ci 6.49E+00 8.52E+00 1.05E+01 7.32E+00 3.28E+01 Average Perod Release Rate for i/e uCi/sec 8.23E-01 1.08E+00 1.33E+00 9.29E-01 1.04E+00 Percent of ODCM Limit  %* ....

G. Iodine 131 & 133, Particulate, C-14 & H-3 Units Qtr I Qtr 2 Qtr 3 Qtr 4 Total Organ Dose mrem 1.24E-01 1.63E-01 2.00E-011 1.40E-01 6.28E-01 Percent of ODCM Limit  % 8.28E-01 1.09E+00 1.33E+00 9.35E-01 2.09E+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 EFFLUENTS-GROUND-LEVEL RELEASE-BATCH MODE PERIOD 2012 Fission And Activation Gasses Units Qtr I Qtr 2 Qtr 3 Qtr 4 Total 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

- 4 4 4 4 ---- ~ 4 Kr-85m Ci N/A NIA NIA N/A NIA Kr-87 Ci N/A N/A N/A N/A N/A N/A Ci . N/A N/A N/A N/A Kr-88 Xe-1 33 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-1 38 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 I Qtr 2 Qtr 3 Qtr 4 Annual 1-131 Ci N/A N/A < LLD N/A < LLD 1-133 Ci N/A N/A < LLD N/A < LLD 1-135 Ci N/A N/A < LLD N/A < LLD Total Ci N/A N/A < LLD N/A < LLD Particulates Units Qtr I Qtr 2 Qtr 3 Qtr 4 Annual Cr-51 Ci N/A N/A < LLD N/A < LLD Mn-54 Ci N/A N/A < LLD N/A < LLD Co-58 Ci N/A N/A < LLD N/A < LLD Co-60 Ci N/A N/A 6.60E-1 1 N/A 6.60E-1 1 Zn-65 Ci N/A N/A < LLD N/A < LLD Sr-89 Ci N/A N/A < LLD N/A < LLD Sr-90 Ci N/A N/A < LLD N/A < LLD Mo-99 Ci N/A N/A < LLD N/A < LLD Ag- 110m Ci N/A N/A < LLD N/A < LLD Cs- 134 Ci N/A N/A < LLD N/A < LLD Cs-137 CI N/A N/A < LLD N/A < LLD Ba-140 Ci N/A N/A < LLD N/A < LLD La-140 Ci N/A N/A < LLD N/A < LLD Ce-141 Ci N/A N/A < LLD N/A < LLD Ce-144 Ci N/A N/A < LLD N/A < LLD Total Ci N/A N/A 6.60E- I1 N/A 6.60E-1 1 H-3 Ci N/A N/A N/A 1.67E-04 1.67E-04 Gross Alpha f'li N/A N/A NI/A NI/A NiI/A C-14 Ci N/A N 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 2012 Fission And Activation Gasses Units Qtr I Qtr 2 Qtr 3 Qtr 4 Total Kr-85m Ci 4.36E-01 3.52E-01 6.28E-02 4.80E-01 1.33E+00 Kr-85 Ci 1.55E-01 2.97E-01 7.41E-02 1.61E+00 2.14E+00 Kr-87 Ci 2.03E-01 4.11E-01 7.76E-02 8.01E-01 1.49E+00 Kr-88 Ci 6.74E-01 5.16E-01 1.04E-01 1.37E+00 2.67E+00 Ar-41 Ci 2.54E-01 1.14E+00 1.80E-01 2.28E-01 1.80E+00 Xe-131m Ci 3.89E-03 7.43E-03 1.86E-03 4.03E-02 5.35E-02 Xe-133m Ci 3.98E-01 O.OOE+00 O.OOE+00 O.OOE+00 3.98E-01 Xe-1 33 Ci 1.24E+01 5.95E+00 9.44E-01 1.33E+00 2.07E+01 Xe-135m Ci 1.71E+00 4.88E+00 8.36E-01 4.59E+00 1.20E+01 Xe-135 Ci 5.94E+00 4.18E+00 7.61E-01 6.50E+00 1.74E+01 Xe-138 Ci 9.18E-01 2.12E+00 4.71E-0I 8.17E+00 1.17E+01 Total Ci 2.31E+01 1.99E+01 3.51E+00 2.51E+01 7.16E+01 Radlolodines Units Qtr I Qtr 2 Qtr 3 Qtr 4 Total 1-131 Ci 1.04E-04 3.11E-05 < LLD < LLD 1.35E-04 1-133 Ci < LLD < LLD < LLD < LLD < LLD 1-135 Ci < LLD < LLD < LLD < LLD < LLD Total Ci 1.04E-04 3.11 E-05 < LLD < LLD 1.35E-04 Partlculates Units Qtr I 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 < LLD < LLD < LLD < LLD < LLD Ni-63 Ci < LLD < LLD < LLD < LLD < LLD 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 < LLD < LLD < LLD < LLD < LLD H-3 Ci 3.21E+01 1.06E+01 1.30E+01 1.60E+01 7.16E+01 Gross Alpha Ci < LLD < LLD < LLD < LLD < LLD C-14 Ci 6.49E+00 8.52E+00 1.05E+01 7.32E+00 3.28E+01 Page 15

SITE: LIMERICK GENERATING STATION - UNITS 1 & 2 LICENSEE: EXELON GENERATION COMPANY, LLC TABLE 2A LIQUID EFFLUENTS - SUMMATION OF ALL RELEASES PERIOD 2012 Fission and Activation Uncertaint Products Excluding Units Qtr I Qtr 2 Qtr 3 Qtr 4 Total N Tritium, Gasses & Alpha)_ _ (%)

Total Release Ci 7.92E-04 2.76E-04 1.62E-04 9.07E-06 1.24E-03 21.1 Average Concentration uCi/mI 1.62E-08 6.36E-09 7.98E-09 2.OOE-09 1.06E-08 Dose - Whole Body mrem 3.04E-02 3.27E-02 1.30E-02 4.75E-03 8.09E-02

- Organ mrem 3.04E-02 3.27E-02 1.30E-02 4.75E-03 8.09E-02

%of ODOM Limit

%Whole Lit Bdy 1.01 E+00 1.09E+00 4.33E-01 1.58E-01

- Whole Bodly Dose*  % 1.35E+00

- Organ Dose*  % 3.04E-01 3.27E-01 1.30E-01 4.75E-02 4.05E-01 Tritium Units Qtr 1 Qtr 2 Qtr 3 Qtr 4 Total Uncertainty Total Release Ci 6.30E+00 6.34E+00 2.76E+00O 8.82E-01 1.63E+01 6.4 Average Concentration uCi/mI 1.29E-04 1.46E-04 1.36E-04 1.95E-04 1.39E-04 I/ of ODCM Limit - ECL  % 1.29E+00 1.46E+00 1.36E+00 1.95E+00 1.39E+00 Dissolved and Entrained Uncertainty Gases Units Qtr I Otr 2 Otr 3 Qtr 4 Total M%

otal Release Ci 3.94E-05 2.72E-05 1.56E-05 4.71E-06 8.68E-05 21.1 verage Concentration uCi/mI 8.08E-10 6.27E-10 7.64E-10 1.04E-09 7.43E-10 Y of ODCM Limit - ECL  % 4.04E-04 3.14E-04 3.82E-04 5.20E-04 3.71E-04 Gross Alpha Units Qtr I Qtr 2 Qtr 3 Qtr 4 Total Uncertainty Total Release Ci < LLD < LLD 9.OOE-05 < LLD 9.OOE-05 23.0 Average Concentration uCi/mI N/A N/A 1.37E-07 N/A 2.43E-08 Volume of Waste Released Units Qtr I Qtr 2 Qtr 3 Qtr 4 Total Uncertainty Total Liters 1.51 E+06 1.39E+06 6.55E+05 1.52E+05 3.70E+06 5.0 olume of Dilution Water Units Qtr I Qtr 2 Qtr 3 Qtr 4 Total Uncertainty used durnn period (0) otal Liters 4.72E+07 4.20E+07 1.97E+07 4.37E+06 1.13E+08 3.6

• Percent of limit includes gases and tritium.

Page 16

SITE: LIMERICK GENERATING STATION - UNITS 1 & 2 LICENSEE: EXELON GENERATION COMPANY, LLC TABLE 2A-1 LIQUID EFFLUENTS - BATCH MODE PERIOD 2012 Fission and Activation Units Qtr I Qtr 2 Qtr 3 Qtr 4 Total Products Utr34 NA-24 CI < LLD 6.87E-06 < LLD < LLD 6.87E-06 Cr-51 CI 2.21 E-04 8.98E-06 1.86E-05 < LLD 2.49E-04 Mn-54 Ci 8.30E-05 2.35E-05 1.37E-05 < LLD 1.20E-04 Fe-55 Ci < LLD < LLD < LLD < LLD < LLD Co-58 CI 2.OOE-05 7.41 E-06 1.02E-05 < LLD 3.77E-05 Fe-59 Ci 1.23E-05 < LLD < LLD < LLD 1.23E-05 Co-60 Ci 3.95E-04 2.03E-04 1.06E-04 9.07E-06 7.14E-04 Zn-65 Ci 4.06E-05 1.61E-05 1.21E-05 < LLD 6.88E-05 Zn-69m Ci 1.52E-06 1.13E-06 < LLD < LLD 2.65E-06 Sr-89 Ci < LLD < LLD < LLD < LLD <LLD Sr-90 Ci < LLD < LLD < LLD < LLD < LLD Zr-95 Ci < LLD < LLD 1.36E-06 < LLD 1.36E-06 Nb-95 Ci 2.63E-06 < LLD < LLD < LLD 2.63E-06 Nb-97 Ci 2.48E-06 < LLD < LLD < LLD 2.48E-06 Mo-99 Ci 9.40E-07 < LLD < LLD < LLD 9.40E-07 TC-99m Ci 1.11E-06 < LLD < LLD < LLD 1.11E-06 AG-110m Ci < LLD < LLD < LLD < LLD <LLD Sb-124 Ci < LLD < LLD < LLD < LLD < LLD Sb-125 Ci < LLD < LLD < LLD < LLD < LLD 1-131 Ci 8.58E-07 < LLD < LLD < LLD 8.58E-07 Cs-1 34 Ci 1.62E-06 1.08E-06 < LLD < LLD 2.70E-06 Cs-137 Ci 7.68E-06 5.99E-06 < LLD < LLD 1.37E-05 Ba-140 Ci < LLD < LLD < LLD < LLD < LLD La-140 Ci < LLD < LLD < LLD < LLD < LLD Ce-141 Ci < LLD < LLD < LLD < LLD < LLD U-235 Ci < LLD 1.25E-06 < LLD < LLD 1.25E-06 Total Ci 7.92E-04 2.76E-04 1.62E-04 9.07E-06 1.24E-03 Dissolved and Entrained Gases Units Qtr I Qtr 2 Qtr 3 Qtr 4 Total

,r-41 Ci 1.99E-06 < LLD < LLD < LLD 1.99E-06 Xe-131m < LLD < LLD < LLD < LLD < LLD Xe-133 Ci 1.61E-05 1.45E-05 1.11E-05 < LLD 4.18E-05 Xe-135 Ci 2.13E-05 1.27E-05 4.44E-06 4.71E-06 4.31E-05 Total Ci 3.94E-05 2.72E-05 1.56E-05 4.71 E-06 8.68E-05 H-3 Ci 6.30E+00 6.33E+00 2.76E+00 8.82E-01 1.63E+01 Gross Alpha Ci < LLD <LLD 9.OOE-05 < LLD 9.OOE-05 Page 17

SITE: LIMERICK GENERATING STATION - UNITS I & 2 LICENSEE: EXELON GENERATION COMPANY, LLC TABLE 2A-2 LIQUID EFFLUENTS - CONTINUOUS MODE PERIOD 2012 Fission and Activation Units Qtr 1 Qtr 2 Qtr 3 Qtr 4 Total Products Units trIt2tr3r4Ta 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 C 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 1-131 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 Entrained Gases Units Qtr I Qtr 2 Qtr 3 Qtr 4 Total 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 NIA 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 I & 2 LICENSEE: EXELON GENERATION COMPANY, LLC Appendix B Solid Waste and Irradiated Fuel Shipments Page 19

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

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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) 01/01/2012 - 12/31/2012

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

a. Spent resin, filters sludges, evaporator m3 136.20 25%

bottoms, etc Ci 4.80E+02 1 Dry compressible waste, contaminated m3 i 113.19 25%

equipment, etc. Ci 6.78E+00

" Irradiated components, control rods, etc. m3 None N/A 1c. Ci None Pi. Other (Describe) Ima None I 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 1.92E+00 0.95%

Mn-54 7.78E+00 3.88%

Fe-55 8.34E+01 41.68%

Co-60 8.01 E+01 40.04%

Ni-59 3.14E-02 0.01%

Ni-63 4.21E+00 2.10%

Zn-65 1.03E+01 5.14%

Sr-90 8.41E-02 0.03%

Cs-I37 6.64E+00 3.30%

Ce-144 2.29E-02 0.01%

Cs-134 4.16E+00 2.07%

H-3 7.62E-02 0.03%

Co-58 1.55E+00 0.76%

TOTALS 2.OOE+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.

Isotope Waste Class A Percent Curies

• Abundance Co-60 2.17E+00 32.01%

Cs-137 8.52E-03 0.12%

Fe-55 4.13E+00 60.92%

Mn-54 2.38E-01 3.51%

Ni-63 1.10E-01 1.63%

Zn-65 5.39E-02 0.79%

H-3 6.89E-02 1.02%

TOTALS 6.78E+00 100.00%

• Activity is estimated

3. Solid Waste (Disposition)

Number of Mode of Transportation Destination Shipments 49 Truck Energy Solutions (Bear Creek Operations to Clive) 18 Truck Limerick Gen. Sta. to Energy Solutions / Clive 1 Truck Limerick Gen. Sta. to Waste Control Spec./Texas Waste (Processing)

Number of Mode of Transportation Destination Shipments 39 Truck Limerick Gen. Sta. to Energy Solutions Processing Facility 3 Truck Limerick Gen Sta to TOSCO Processing Facility Waste (Solidification)

Number of Mode of Transportation Destination Shipments 0 N/A N/A Category A - 24 shipments Type A LSA Category A - 4 shipments > Type A LSA Category A - 1 shipment Type B Category B - 32 shipments Type A LSA Category C - No shipments made Category D - No shipments made B. Irradiated Fuel Shipments (disposition)

Number of Shipmentsl Mode of Transportation INDestination 0 N/A IN/A Page 22

SITE: LIMERICK GENERATING STATION - UNITS 1 & 2 LICENSEE: EXELON GENERATION COMPANY, LLC C. Changes to the Process Control Program Revision 8 to RW-AA-1 00, "Process Control Program for Radioactive Wastes" was implemented in 2012. The revision addresses the storage of waste from one Exelon Nuclear plant at another Exelon Nuclear plant provided NRC approval has been received for the transfer of the waste.

Wording was also added to the procedure to address the storage of activated hardware in the pool or processed into the dry cask storage system.

Page 23

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

Page 24

SITE: LIMERICK GENERATING STATION - UNITS 1 & 2 LICENSEE: EXELON GENERATION COMPANY, LLC Appendix C Meteorological Data Page 25

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

Page 26

SITE: LIMERICK GENERATING STATION - UNITS I & 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, 2012 29 Table D - 2 Wind Speed by Direction Measured at 175 Feet for Various Stability Classes for the Limerick Generating Station, January - March, 2012 36 Table D - 3 Wind Speed by Direction Measured at 30 Feet for Various Stability Classes for the Limerick Generating Station, April - June, 2012 43 Table D - 4 Wind Speed by Direction Measured at 175 Feet for Various Stability Classes for the Limerick Generating Station, April - June, 2012 50 Table D - 5 Wind Speed by Direction Measured at 30 Feet for Various Stability Classes for the Limerick Generating Station, July - September, 2012 57 Table D - 6 Wind Speed by Direction Measured at 175 Feet for Various Stability Classes for the Limerick Generating Station, July - September, 2012 64 Table D - 7 Wind Speed by Direction Measured at 30 Feet for Various Stability Classes for the Limerick Generating Station, October - December, 2012 71 Table D - 8 Wind Speed by Direction Measured at 175 Feet for Various Stability Classes for the Limerick Generating Station, October - December, 2012 78 Table D - 9 Wind Speed by Direction Measured at 30 Feet for Various Stability Classes for the Limerick Generating Station, January - December, 2012 85 Table D - 10 Wind Speed by Direction Measured at 175 Feet for Various Stability Classes for the Limerick Generating Station, January - December, 2012 87 Table D - 11 Annual x/Q undepleted and D/Q values for the North Stack, Limerick Generating Station, 2012 89 Table D - 12 Annual x/Q undepleted and D/Q values for the South Stack, Limerick Generating Station, 2012 91 Page 27

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

Page 28

SITE: LIMERICK GENERATING STATION - UNITS 1 & 2 LICENSEE: EXELON GENERATION COMPANY, LLC Table D - I Wind Speed by Direction Measured at 30 Feet for Various Stability Classes for the Limerick Generating Station, January - March, 2012 Limerick Tower 1 Period of Record: January - March 2012 Stability Class - Extremely Unstable - l7lFt-26Ft Delta-T (F)

Winds Measured at 30 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 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 3 0 0 0 3 S 0 7 4 0 0 0 11 SSW 0 10 14 1 0 0 25 SW 0 12 4 0 0 0 16 WSW 0 7 3 0 0 0 10 W 0 2 4 2 0 0 8 WNW 0 4 3 0 0 0 7 NW 0 1 0 0 0 0 1 NNW 0 0 1 0 0 0 1 Variable 0 0 0 0 0 0 0 Total 0 43 36 3 0 0 82 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 12 Page 29

SITE: LIMERICK GENERATING STATION - UNITS I & 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, 2012 Limerick Tower 1 Period of Record: January - March 2012 Stability Class - Moderately Unstable - l71Ft-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 NNE 0 0 0 NE 0 0 0 ENE 0 0 0 E 0 0 4 ESE 0 0 1 SE 0 0 1 SSE 0 0 2 S 0 5 00 SSW 0 6 0

SW 0 4 0

WSW 9 0 0 W 8 0 0 WNW 17 0 0 NW 11 00 0 NNW 4 0 0 Variable 0 Total 1 29 40 2 0 0 72 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: 12 Page 30

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, 2012 Limerick Tower 1 Period of Record: January - March 2012 Stability Class - Slightly Unstable - 17lFt-26Ft Delta-T (F)

Winds Measured at 30 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 B-12 13-18 19-24 > 24 Total N 0 1 0 0 0 1 NNE 0 1 0 0 0 1 NE 0 0 0 0 0 0 ENE 0 1 0 0 0 1 E 0 2 6 0 0 8 ESE 0 4 2 0 0 6 SE 0 3 1 0 0 4 SSE 0 1 1 0 0 2 S 1 3 1 0 0 5 SSW 0 3 1 0 0 4 SW 0 6 0 0 0 6 WSW 0 3 1 0 0 4 W 0 6 7 3 0 0 16 WNW 0 7 14 4 0 0 25 NW 0 9 15 4 0 0 28 NNW 0 1 5 0 0 0 6 Variable 0 0 0 0 0 0 0 Total 1 51 54 11 0 0 117 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: 12 Page 31

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, 2012 Limerick Tower 1 Period of Record: January - March 2012 Stabil itv Class - Neutral - l7lFt-26Ft Delta--T (F)

Winds Measured at 30 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 13 22 14 0 49 NNE 10 15 4 0 29 NE 17 24 2 0 43 ENE 18 38 4 0 60 E 10 29 42 1 82 ESE 4 13 7 0 24 SE 5 10 2 0 17 SSE 8 11 2 0 21 S 5 14 4 0 23 SSW 8 27 6 1 42 SW 8 16 1 0 25 WSW 7 13 1 1 22 W 12 34 47 7 100 WNW 10 36 40 25 112 NW 5 42 99 43 190 NNW 5 14 30 9 65 Variable 1 0 0 0 1 Total 146 358 305 87 9 0 905 Hours of calm in this stability class: 2 Hours of missing wind measurements in this stability class: 1 Hours of missing stability measurements in all stability classes: 12 Page 32

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, 2012 Limerick Tower 1 Period of Record: January - March 2012 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 14 7 0 0 0 21 NNE 20 9 1 0 0 30 NE 11 6 1 0 0 18 ENE 13 15 1 0 0 29 E 14 15 15 0 0 45 ESE 15 6 8 0 0 29 SE 10 4 0 0 0 14 SSE 6 15 4 0 0 25 S 18 37 3 0 0 58 SSW 13 26 11 0 0 50 SW 18 19 4 0 0 41 WSW 27 15 0 0 0 42 W 28 41 18 0 0 88 WNW 28 40 6 0 0 78 NW 10 19 13 0 0 47 NNW 10 10 6 0 0 29 Variable 0 0 0 0 0 0 Total 255 284 91 14 0 0 644 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: 12 Page 33

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, 2012 Limerick Tower 1 Period of Record: January - March 2012 Stability Class - Moderately Stable - l7lFt-26Ft Delta-T (F)

Winds Measured at 30 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 8 0 8 NNE 7 1 8 NE 3 0 3 ENE 10 0 10 E 9 1 10 ESE 6 1 7 SE 5 1 6 SSE 2 0 2 S 6 1 7 SSW 4 3 7 SW 6 1 7 WSW 8 4 12 W 27 4 31 WNW 18 8 26 NW 6 2 8 NNW 10 0 10 Variable 4 0 4 Total 139 27 0 166 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: 12 Page 34

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, 2012 Limerick Tower 1 Period of Record: January - March 2012 Stability Class - Extremely Stable - l7lFt-26Ft Delta-T (F)

Winds Measured at 30 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 15 3 0 0 0 0 18 NNE 6 0 0 0 0 0 6 NE 13 0 0 0 0 0 13 ENE 7 0 0 0 0 0 7 E 3 0 0 0 0 0 3 ESE 4 0 0 0 0 0 4 SE 3 0 0 0 0 0 3 SSE 3 0 0 0 0 0 3 S 3 1 0 0 0 0 4 SSW 3 0 0 0 0 0 3 SW 7 0 0 0 0 0 7 WSW 6 0 0 0 0 0 6 W 27 0 0 0 0 0 27 WNW 21 1 0 0 0 0 22 NW 23 1 0 0 0 0 24 NNW 19 0 0 0 0 0 19 Variable 0 0 0 0 0 0 0 Total 163 6 0 0 0 0 169 Hours of calm in this stability class: 10 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 12 Page 35

SITE: LIMERICK GENERATING STATION - UNITS I & 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, 2012 Limerick Tower 1 Period of Record: January - March 2012 Stability Class - Extremely Unstable - l7lFt-26Ft Delta-T (F)

Winds Measured at 175 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 NNE 0 0 NE 0 0 ENE 0 0 E 0 0 ESE 0 0 SE 0 0 SSE 0 3 S 3 7 SSW 14 24 SW 11 22 WSW 4 10 W 1 6 WNW 4 8 NW 0 0 NNW 2 2 Variable 0 0 Total 0 4 39 32 5 2 82 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 12 Page 36

SITE: LIMERICK GENERATING STATION - UNITS I & 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, 2012 Limerick Tower 1 Period of Record: January - March 2012 Stability Class - Moderately Unstable - 17lFt-26Ft Delta-T (F)

Winds Measured at 175 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 0 0 1 NNE 0 0 0 0 0 NE 0 0 0 0 0 ENE 0 0 0 0 0 E 0 3 0 0 3 ESE 0 2 0 0 2 SE 0 0 0 0 0 SSE 0 0 0 0 1 S 0 3 1 0 5 SSW 0 2 1 0 7 SW 0 3 3 0 6 WSW 0 2 5 0 9 W 0 1 7 0 8 WNW 0 1 11 0 17 NW 0 0 9 1 0 0 10 NNW 0 1 2 0 0 0 3 Variable 0 0 0 0 0 0 0 Total 0 12 28 29 3 0 72 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: 12 Page 37

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, 2012 Limerick Tower 1 Period of Record: January - March 2012 Stability Class - Slightly Unstable - l7lFt-26Ft Delta-T (F)

Winds Measured at 175 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total 0 0 1 N 0 0 1 0 0 NNE 1 1 0 2 0 0 NE 0 0 0 0 0 0 ENE 1 0 0 1 0 0 E 1 5 0 6 0 0 ESE 2 4 0 6 0 0 SE 1 4 0 5 0 0 SSE 1 0 1 2 0 0 S 1 3 0 4 0 0 SSW 2 3 1 6 0 0 SW 2 2 1 5 0 0 WSW 1 4 1 6 W 3 3 3 5 2 16 WNW 2 6 13 2 3 26 NW 2 9 2 0 24 NNW 0 5 2 0 0 7 Variable 0 0 0 0 0 0 Total 0 20 49 34 9 5 117 Hours of calm in this stability class:

Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 12 Page 38

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, 2012 Limerick Tower 1 Period of Record: January - March 2012 Stability Class - Neutral - l7lFt-26Ft Delta-T (F)

Winds Measured at 175 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 10 25 3 1 41 NNE 18 14 6 0 38 NE 22 13 2 0 46 ENE 31 8 1 0 47 E 29 41 14 1 89 ESE 6 18 8 0 35 SE 5 8 2 0 19 SSE 5 8 0 0 16 S 8 7 2 0 23 SSW 12 22 9 2 50 SW 9 10 1 2 24 WSW 5 11 3 1 26 W 9 13 35 12 78 WNW 12 40 52 24 137 NW 13 56 61 27 160 NNW 6 17 28 12 73 Variable 0 0 0 0 0 Total 58 200 311 227 82 24 902 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 6 Hours of missing stability measurements in all stability classes: 12 Page 39

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, 2012 Limerick Tower 1 Period of Record: January - March 2012 Stability Class - Slightly Stable - l7lFt-26Ft Delta-T (F)

Winds Measured at 175 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 8 13 0 24 NNE 8 9 2 21 NE 10 3 1 20 ENE 35 4 0 42 E 7 15 5 31 ESE 9 11 8 32 SE 6 5 0 13 SSE 8 4 2 17 S 13 27 7 51 SSW 19 34 10 71 SW 22 16 11 55 WSW 13 19 4 37 W 15 24 18 65 WNW 24 39 8 81 NW 14 27 8 54 NNW 6 10 6 27 Variable 0 0 0 0 Total 37 217 260 90 35 2 641 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 4 Hours of missing stability measurements in all stability classes: 12 Page 40

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, 2012 Limerick Tower 1 Period of Record: January - March 2012 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 2 4 2 0 0 0 8 NNE 1 6 2 0 0 0 9 NE 0 3 0 0 0 0 3 ENE 1 5 0 0 0 0 6 E 1 3 2 0 0 0 6 ESE 4 2 0 0 0 0 6 SE 3 1 1 0 0 0 5 SSE 3 4 0 0 0 0 7 S 2 9 2 0 0 0 13 SSW 0 3 3 0 0 0 6 SW 1 5 4 0 0 0 10 WSW 1 7 7 3 0 0 18 W 2 7 6 0 0 0 15 WNW 1 17 14 0 0 0 32 NW 1 12 5 2 0 0 20 NNW 0 4 1 0 0 0 5 Variable 0 0 0 0 0 0 0 Total 23 92 49 5 0 0 169 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: 12 Page 41

SITE: LIMERICK GENERATING STATION - UNITS 1 & 2 LICENSEE: EXELON GENERATION COMPANY, LLC Table D - 2 Wind Speed by Direction Measured at 175 Feet for Various Stability Classes for the Limerick Generating Station, January - March, 2012 Limerick Tower 1 Period of Record: January - March 2012 Stability Class - Extremely Stable - 17lFt-26Ft Delta-T (F)

Winds Measured at 175 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 2 6 NNE 0 0 2 NE 0 0 3 ENE 2 0 5 E 0 0 2 ESE 1 0 1 SE 1 0 2 SSE 0 1 4 S 8 0 13 SSW 11 2 17 SW 6 5 18 WSW 9 2 16 W 9 1 17 WNW 19 11 41 NW 8 7 23 NNW 2 1 8 Variable 0 0 0 Total 65 76 32 5 0 0 178 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: 12 Page 42

SITE: LIMERICK GENERATING STATION - UNITS I & 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, 2012 Limerick Tower 1 Period of Record: April - June 2012 Stability Class - Extremely Unstable - l7lFt-26Ft Delta-T (F)

Winds Measured at 30 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 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 1 0 0 0 0 1 S 0 2 0 0 0 0 2 SSW 0 0 0 0 0 0 0 SW 0 4 1 0 0 0 5 WSW 0 1 2 0 0 0 3 W 0 9 1 0 0 0 10 WNW 0 4 3 0 0 0 7 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 21 7 0 0 0 28 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: 78 Page 43

SITE: LIMERICK GENERATING STATION - UNITS I & 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, 2012 Limerick Tower 1 Period of Record: April - June 2012 Stability Class - Moderately Unstable - 17lFt-26Ft Delta-T (F)

Winds Measured at 30 Feet Wind Spe ed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total 0 0 N 0 0 0 0 0 0 NNE 0 0 0 0 0 0 NE 0 0 0 0 0 0 ENE 0 0 0 0 0 0 E 0 0 0 0 0 0 ESE 0 1 0 1 0 0 SE 0 2 0 2 0 0 SSE 0 2 0 2 S 0 1 1 0 0 2 SSW 0 5 3 0 0 8 SW 0 2 1 0 0 3 WSW 1 2 3 0 0 6 W 0 3 2 1 0 6 WNW 0 11 0 2 0 13 NW 0 1 3 2 0 6 NNW 0 0 0 0 0 0 Variable 0 0 0 0 0 0 Total 1 30 13 5 0 0 49 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: 78 Page 44

SITE: LIMERICK GENERATING STATION - UNITS I & 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, 2012 Limerick Tower 1 Period of Record: April - June 2012 Stability Class - Slightly Unstable - 171Ft-26Ft Delta-T (F)

Winds Measured at 30 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 0 0 NNE 0 0 0 0 NE 0 0 0 0 ENE 0 0 0 1 E 0 0 0 2 ESE 0 0 0 0 SE 0 0 0 4 SSE 0 0 0 1 S 0 0 0 2 SSW 1 0 0 8 SW 0 0 0 1 WSW 0 8 0 0 8 W 0 7 1 0 0 8 WNW 0 6 4 2 0 12 NW 0 7 14 5 0 0 26 NNW 1 1 3 0 0 0 5 Variable 0 0 0 0 0 0 0 Total 2 44 25 7 0 0 78 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: 78 Page 45

SITE: LIMERICK GENERATING STATION - UNITS I & 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, 2012 Limerick Tower 1 Period of Record: April - June 2012 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 2 27 12 0 41 NNE 1 15 2 0 18 NE 3 17 1 0 21 ENE 2 25 0 0 27 E 12 35 13 0 60 ESE 10 12 13 3 38 SE 5 13 0 0 18 SSE 11 6 0 0 17 S 10 26 8 0 44 SSW 20 27 2 0 49 SW 10 11 0 0 21 WSW 16 22 0 0 38 W 10 22 5 0 37 WNW 9 33 17 6 65 NW 14 49 83 41 187 NNW 7 19 33 13 73 Variable 0 0 0 0 0 Total 142 359 189 63 1 0 754 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: 78 Page 46

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, 2012 Limerick Tower 1 Period of Record: April - June 2012 Stability Class - Slightly Stable - l7lFt-26Ft Delta-T (F)

Winds Measured at 30 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 11 11 18 1 0 0 41 NNE 9 8 3 2 0 0 22 NE 12 9 0 0 0 0 21 ENE 19 13 1 0 0 0 33 E 10 44 12 0 0 0 66 ESE 15 26 8 0 0 0 49 SE 14 15 1 0 0 0 30 SSE 19 26 0 0 0 0 45 S 21 32 4 0 0 0 57 SSW 22 36 1 0 0 0 59 SW 16 7 0 0 0 0 23 WSW 31 6 0 0 0 0 37 W 33 22 1 0 0 0 56 WNW 22 33 7 1 0 0 63 NW 13 48 24 5 0 0 90 NNW 16 25 22 2 0 0 65 Variable 0 0 0 0 0 0 0 Total 283 361 102 11 0 0 757 Hours of calm in this stability class: 2 Hours of missing wind measurements in this stability class: 1 Hours of missing stability measurements in all stability classes: 78 Page 47

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, 2012 Limerick Tower 1 Period of Record: April - June 2012 Stability Class - Moderately Stable - 17lFt-26Ft Delta-T (F)

Winds Measured at 30 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total 0 0 9 N 7 2 0 0 4 NNE 3 1 0 0 7 NE 6 1 0 0 3 ENE 3 0 0 0 8 E 7 1 0 0 7 ESE 5 2 0 0 0 5 SE 5 0 0 9 SSE 8 1 0 0 5 S 3 2 4 0 0 13 SSW 9 2 0 0 14 SW 12 0 0 15 WSW 15 0 W 30 6 0 0 36 WNW 34 6 0 0 40 NW 18 11 0 0 29 NNW 16 0 0 0 16 Variable 1 1 0 0 2 Total 182 40 0 0 0 0 222 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: 78 Page 48

SITE: LIMERICK GENERATING STATION - UNITS 1 & 2 LICENSEE: EXELON GENERATION COMPANY, LLC Table D - 3 Wind Speed by Direction Measured at 30 Feet for Various Stability Classes for the Limerick Generating Station, April - June, 2012 Limerick Tower 1 Period of Record: April - June 2012 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 0 0 12 N 12 0 0 8 NNE 8 0 0 11 NE 11 0 0 11 ENE 11 0 0 9 E 9 0 0 4 ESE 3 0 0 2 SE 2 0 0 0 SSE 0 0 0 2 S 2 0 0 2 SSW 2 0 0 7 SW 6 0 0 12 WSW 12 W 27 0 0 29 WNW 38 0 0 42 NW 24 0 0 25 NNW 24 0 0 24 Variable 1 0 0 1 Total 192 9 0 0 0 0 201 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: 78 Page 49

SITE: LIMERICK GENERATING STATION - UNITS I &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, 2012 Limerick Tower 1 Period of Record: April - June 2012 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 2 0 0 0 2 SSW 0 0 1 0 0 0 1 SW 0 0 4 0 1 0 5 WSW 0 0 1 1 2 0 4 W 0 1 11 2 0 0 14 WNW 0 0 1 1 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 0 1 20 4 3 0 28 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: 78 Page 50

SITE: LIMERICK GENERATING STATION - UNITS I & 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, 2012 Limerick Tower 1 Period of Record: April - June 2012 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 NNE 0 0 0 NE 0 0 0 ENE 0 0 0 E 0 0 0 ESE 0 0 0 SE 0 0 3 SSE 0 0 1 S 0 0 2 SSW 0 0 8 SW 0 1 5 WSW 0 1 5 W 0 2 16 WNW 0 0 6 NW 0 2 3 NNW 0 0 0 Variable 0 0 0 Total 0 8 20 13 6 2 49 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: 78 Page 51

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, 2012 Limerick Tower 1 Period of Record: April - June 2012 Stability Class - Slightly Unstable - l7lFt-26Ft Delta-T (F)

Winds Measured at 175 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 >24 Total N 0 0 NNE 1 1 NE 0 0 ENE 0 1 E 0 2 ESE 0 0 SE 0 2 SSE 0 2 S 0 2 SSW 0 8 SW 0 2 WSW 0 8 W 0 8 WNW 0 2 8 10 1 2 23 NW 0 2 3 6 4 0 15 NNW 0 0 3 1 0 0 4 Variable 0 0 0 0 0 0 0 Total 1 19 27 24 5 2 78 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stab:ility measurements in all stability classes: 78 Page 52

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, 2012 Limerick Tower 1 Period of Record: April - June 2012 Stability Class - Neutral - l7lFt-26Ft Delta-T (F)

Winds Measured at 175 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 2 16 25 10 2 55 NNE 1 13 4 1 0 19 NE 3 11 5 1 0 20 ENE 0 16 8 0 0 24 E 3 20 28 6 0 57 ESE 5 12 10 7 3 37 SE 8 8 8 1 1 26 SSE 1 10 2 0 0 13 S 4 16 15 6 0 41 SSW 4 23 17 5 0 49 SW 5 14 10 1 1 31 WSW 6 21 11 9 0 47 W 5 15 17 6 3 46 WNW 7 18 27 24 16 94 NW 6 13 32 59 22 132 NNW 0 8 21 29 4 63 Variable 0 0 0 0 0 0 Total 60 234 240 165 52 3 754 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: 78 Page 53

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, 2012 Limerick Tower 1 Period of Record: April - June 2012 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 6 22 18 0 50 NNE 5 7 7 3 27 NE 3 8 0 0 16 ENE 14 4 0 0 24 E 25 29 5 1 66 ESE 15 18 1 0 38 SE 18 23 7 1 53 SSE 14 23 0 0 42 S 25 27 5 0 63 SSW 17 36 5 0 63 SW 17 15 4 0 41 WSW 10 12 3 0 27 W 16 20 6 0 46 WNW 22 42 14 6 89 NW 8 38 9 4 65 NNW 9 28 7 1 48 Variable 0 0 0 0 0 Total 74 224 352 91 16 1 758 Hours of calm in this stability class: 1 Hours of missing wind measurements in this stability class: I Hours of missing stability measurements in all stability classes: 78 Page 54

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, 2012 Limerick Tower 1 Period of Record: April - June 2012 Stability Class - Moderately Stable - l7lFt-26Ft Delta-T (F)

Winds Measured at 175 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 7 4 0 0 11 NNE 2 5 1 0 0 8 NE 2 3 1 0 0 6 ENE 4 4 0 0 0 8 E 1 1 1 0 0 3 ESE 2 3 3 0 0 8 SE 2 0 2 0 0 4 SSE 2 1 0 0 0 3 S 2 5 2 0 0 9 SSW 5 8 7 0 0 20 SW 0 7 10 1 0 18 WSW 0 7 10 0 0 17 W 1 21 5 0 0 27 WNW 4 23 20 0 0 47 NW 3 10 12 1 0 26 NNW 1 3 4 0 0 8 Variable 0 0 0 0 0 0 Total 31 108 82 2 0 0 223 Hours of calm in this stability class: 1 Hours of missing wind measurements in this stability class:

Hours of missing stability measurements in all stability classes: 78 Page 55

SITE: LIMERICK GENERATING STATION - UNITS I & 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, 2012 Limerick Tower 1 Period of Record: April - June 2012 Stability Class - Extremely Stable - l71Ft-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 1 0 0 11 NNE 8 4 0 0 15 NE 1 0 0 0 1 ENE 10 0 0 0 13 E 5 0 0 0 8 ESE 3 3 0 0 7 SE 2 1 0 0 6 SSE 0 0 0 0 1 S 3 1 0 0 5 SSW 1 0 0 0 2 SW 5 1 0 0 7 WSW 9 3 0 0 13 W 16 4 0 0 23 WNW 29 28 0 0 63 NW 17 6 0 0 27 NNW 7 0 0 0 9 Variable 0 0 0 0 0 Total 31 122 52 0 0 211 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: 78 Page 56

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, 2012 Limerick Tower 1 Period of Record: July - September 2012 Stability Class - Extremely Unstable - 171Ft-26Ft Delta-T (F)

Winds Measured at 30 Feet Wind Spe4ed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total 0 0 N 0 0 0 0 0 0 NNE 0 0 0 0 0 0 NE 0 0 0 0 0 0 ENE 0 0 0 0 0 0 E 0 0 0 0 0 0 ESE 0 0 0 0 0 0 SE 0 0 0 0 0 0 SSE 0 0 0 0 0 0 S 0 3 0 3 1 0 SSW 0 11 0 12 0 0 SW 0 10 0 10 0 0 WSW 0 3 0 3 0 0 W 0 9 0 9 0 0 WNW 0 5 0 5 NW 0 6 1 0 0 7 NNW 0 0 0 0 0 0 Variable 0 0 0 0 0 0 Total 0 47 2 0 0 0 49 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: 1340 Page 57

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, 2012 Limerick Tower 1 Period of Record: July - September 2012 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 14 0 0 14 SSE 0 0 0 0 0 S 0 3 0 0 3 SSW 0 1 0 0 2 SW 1 3 0 0 4 WSW 0 1 0 0 1 W 0 5 0 0 5 WNW 0 6 0 0 6 NW 1 4 0 0 12 NNW 1 2 0 0 5 Variable 0 0 0 0 0 Total 3 39 10 0 0 0 52 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: 1340 Page 58

SITE: LIMERICK GENERATING STATION - UNITS I & 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, 2012 Limerick Tower 1 Period of Record: July - September 2012 Stability Class - Slightly Unstable - l7lFt-26Ft Delta-T (F)

Winds Measured at 30 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 1 NNE 0 0 0 NE 0 0 0 ENE 0 0 0 E 0 0 1 ESE 0 0 0 SE 0 0 0 SSE 0 0 0 S 0 0 3 SSW 0 0 8 SW 0 0 2 WSW 0 0 4 W 0 0 4 WNW 0 0 4 NW 0 0 14 NNW 0 0 22 Variable 0 0 0 Total 12 26 24 1 0 0 63 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: 1340 Page 59

SITE: LIMERICK GENERATING STATION - UNITS I & 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, 2012 Limerick Tower 1 Period of Record: July - September 2012 Stability Class - Neutral - l7lFt-26Ft Delta-T (F)

Winds Measured at 30 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 2 3 10 NNE 0 0 0 NE 0 0 2 ENE 0 0 2 E 3 0 9 ESE 5 0 7 SE 6 1 16 SSE 7 0 13 S 9 5 23 SSW 13 1 16 SW 0 0 6 WSW 5 1 11 W 7 0 10 WNW 6 0 13 NW 33 12 53 NNW 17 22 41 Variable 0 0 1 Total 73 113 45 0 233 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: 1340 Page 60

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, 2012 Limerick Tower 1 Period of Record: July - September 2012 Stability Class - Slightly Stable - 171Ft-26Ft Delta-T (F)

Winds Measured at 30 Feet Wind Spee d (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 3 1 0 0 0 4 NNE 3 0 0 0 0 3 NE 5 0 0 0 0 5 ENE 3 1 0 0 0 4 E 11 7 0 0 0 18 ESE 12 8 0 0 0 20 SE 2 6 0 0 0 8 SSE 4 7 0 0 0 11i S 1 18 3 1 0 23 SSW 9 10 1 0 0 20 SW 6 2 0 0 0 8 WSW 9 2 0 0 0 11 W 11 2 0 0 0 13 WNW 23 4 0 0 0 27 NW 26 11 1 0 0 38 NNW 5 3 0 0 0 8 Variable 0 0 0 0 0 0 Total 133 82 5 0 0 221 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: 1340 Page 61

SITE: LIMERICK GENERATING STATION - UNITS I &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, 2012 Limerick Tower 1 Period of Record: July - September 2012 Stability Class - Moderately Stable - l7lFt-26Ft Delta-T (F)

Winds Measured at 30 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 14 15 NNE 4 5 NE 3 3 ENE 0 0 E 1 1 ESE 3 3 SE 0 0 SSE 1 1 S 1 1 SSW 5 7 SW 9 10 WSW 16 16 W 8 8 WNW 26 27 NW 23 23 NNW 10 11 Variable 0 0 Total 124 0 131 Hours of calm in this stability class: 6 Hours of missing wind measurements in this stabili ty class: 0 Hours of missing stability measurements in all stability classes: 1340 Page 62

SITE: LIMERICK GENERATING STATION - UNITS 1 & 2 LICENSEE: EXELON GENERATION COMPANY, LLC Table D - 5 Wind Speed by Direction Measured at 30 Feet for Various Stability Classes for the Limerick Generating Station, July - September, 2012 Limerick Tower 1 Period of Record: July - September 2012 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 14 NNE 5 5 NE 5 5 ENE 1 1 E 3 3 ESE 1 1 SE 1 1 SSE 0 0 S 1 SSW 0 0 SW 3 3 WSW 6 6 W 12 12 WNW 15 15 NW 19 19 NNW 12 12 Variable 1 1 Total 98 1 0 0 0 0 99 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: 1340 Page 63

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, 2012 Limerick Tower 1 Period of Record: July - September 2012 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 NNE 0 NE 0 ENE 0 E 0 ESE 0 SE 0 SSE 0 S 4 SSW 11 SW 10 WSW 4 W 10 WNW 8 NW 2 NNW 0 Variable 0 Total 0 17 27 5 0 0 49 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: 1340 Page 64

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, 2012 Limerick Tower 1 Period of Record: July - September 2012 Stability Class - Moderately Unstable - l7lFt-26Ft Delta-T (F)

Winds Measured at 175 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 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 1 9 0 10 SSE 0 2 2 0 4 S 0 1 1 0 2 SSW 0 1 1 0 3 SW 0 3 1 0 4 WSW 0 1 3 0 4 W 0 2 2 0 5 WNW 1 2 2 0 7 NW 0 1 8 0 10 NNW 0 1 1 0 3 Variable 0 0 0 0 0 Total 1 15 30 6 0 0 52 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: 1340 Page 65

SITE: LIMERICK GENERATING STATION - UNITS I & 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, 2012 Limerick Tower 1 Period of Record: July - September 2012 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 0 0 1 NNE 0 0 0 0 0 NE 0 0 0 0 0 ENE 0 0 0 0 0 E 0 1 0 0 1 ESE 0 0 0 0 0 SE 0 0 0 0 0 SSE 0 0 0 0 0 S 0 3 0 0 3 SSW 0 3 3 2 8 SW 0 3 1 0 4 WSW 0 0 2 0 2 W 0 2 1 0 3 WNW 1 7 3 0 11 NW 0 1 7 4 12 NNW 0 2 5 10 17 Variable 0 0 0 0 0 Total 2 22 22 16 0 0 62 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class:

Hours of missing stability measurements in all stability classes: 1340 Page 66

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, 2012 Limerick Tower 1 Period of Record: July - September 2012 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 0 0 7 1 0 0 8 NNE 4 1 0 0 0 0 5 NE 3 0 0 0 0 0 3 ENE 4 1 0 0 0 0 5 E 2 2 6 0 0 0 10 ESE 5 6 3 0 0 0 14 SE 2 3 1 1 0 0 7 SSE 1 2 8 0 4 0 15 S 3 4 13 2 0 0 22 SSW 1 10 3 1 1 0 16 SW 5 3 0 0 0 0 8 WSW 3 1 4 1 1 0 10 W 3 2 4 2 0 0 11 WNW 2 7 14 2 0 0 25 NW 2 12 19 7 0 0 40 NNW 1 5 16 12 0 0 34 Variable 0 0 0 0 0 0 0 Total 41 59 98 29 6 0 233 Hours of calm in this stability class: 1 Hours of missing wind measurements in this s tability class: 0 Hours of missing stability measurements in all stability classes: 1340 Page 67

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, 2012 Limerick Tower 1 Period of Record: July - September 2012 Stability Class - Slightly Stable - l7lFt-26Ft Delta-T (F)

Winds Measured at 175 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 2 2 NNE 3 0 4 NE 0 0 1 ENE 7 0 10 E 8 13 23 ESE 2 4 6 SE 6 1 7 SSE 2 9 13 S 2 19 26 SSW 6 13 24 SW 5 1 8 WSW 7 5 13 W 5 4 11 WNW 21 12 37 NW 17 10 31 NNW 4 1 6 Variable 0 0 0 Total 20 95 94 11 2 0 222 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: 1340 Page 68

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, 2012 Limerick Tower 1 Period of Record: July - September 2012 Stability Class - Moderately Stable - 17lFt-26Ft Delta-T (F)

Winds Measured at 175 Feet Wind Speed (in mph)

Wind Directio*n 1-3 4-7 8-12 13-18 19-24 > 24 Total N 3 2 7 NNE 3 0 4 NE 2 0 2 ENE 0 0 2 E 0 0 0 ESE 0 1 1 SE 0 0 0 SSE 0 1 1 S 1 2 SSW 2 4 7 SW 7 2 10 WSW 7 7 15 W 11 2 14 WNW 25 10 38 NW 14 7 29 NNW 1 1 4 Variable 0 0 0 Total 22 76 38 0 0 0 136 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: 1340 Page 69

SITE: LIMERICK GENERATING STATION - UNITS 1 &2 LICENSEE: EXELON GENERATION COMPANY, LLC Table D - 6 Wind Speed by Direction Measured at 175 Feet for Various Stability Classes for the Limerick Generating Station, July - September, 2012 Limerick Tower 1 Period of Record: July - September 2012 Stability Class - Extremely Stable - l7lFt-26Ft Delta-T (F)

Winds Measured at 175 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 2 1 4 NNE 0 0 1 NE 0 0 0 ENE 0 0 2 E 1 0 3 ESE 1 0 1 SE 0 0 1 SSE 0 0 0 S 1 0 2 SSW 4 2 10 SW 5 1. 9 WSW 1 1 4 W 9 1 12 WNW 26 12 40 NW 12 1 15 NNW 4 1 6 Variable 0 0 0 Total 24 66 20 0 0 0 110 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: 1340 Page 70

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, 2012 Limerick Tower 1 Period of Record: October - December 2012 Stability Class - Extremely Unstable - l7lFt-26Ft Delta-T (F)

Winds Measured at 30 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 0 NNE 0 1 NE 0 0 ENE 0 0 E 0 0 ESE 0 0 SE 0 0 SSE 0 0 S 0 3 SSW 0 9 SW 0 2 WSW 0 2 W 0 3 WNW 0 3 NW 0 3 NNW 0 0 Variable 0 0 Total 0 20 6 0 0 0 26 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: 22 Page 71

SITE: LIMERICK GENERATING STATION - UNITS I & 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, 2012 Limerick Tower 1 Period of Record: October - December 2012 Stability Class - Moderately Unstable - l7lFt-26Ft Delta-T (F)

Winds Measured at 30 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 0 0 0 NNE 1 0 1 0 0 NE 0 0 0 0 0 ENE 0 0 0 0 0 E 1 0 0 0 0 ESE 0 0 2 0 0 SE 0 0 1 0 0 SSE 0 0 0 0 0 S 0 3 0 0 0 SSW 0 5 1 0 0 SW 0 2 0 0 0 WSW 0 2 0 0 0 W 0 8 5 0 0 WNW 1 5 2 0 0 NW 0 1 3 1 0 NNW 0 0 0 0 0 Variable 0 0 0 0 0 Total 3 26 15 1 0 0 45 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: 22 Page 72

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, 2012 Limerick Tower 1 Period of Record: October - December 2012 Stability Class - Slightly Unstable - l7lFt-26Ft Delta-T (F)

Winds Measured at 30 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 0 0 0 NNE 1 3 0 0 4 NE 2 4 0 0 6 ENE 0 7 0 0 7 E 0 3 0 0 3 ESE 0 0 0 0 0 SE 0 0 0 0 0 SSE 0 1 0 0 1 S 0 5 0 0 5 SSW 0 1 1 0 2 SW 0 1 0 0 1 WSW 0 1 0 0 1 W 1 7 0 0 8 WNW 0 7 6 0 13 NW 0 7 18 1 26 NNW 0 0 2 1 3 Variable 0 0 0 0 0 Total 4 47 27 2 0 0 80 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 22 Page 73

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, 2012 Limerick Tower 1 Period of Record: October - December 2012 Stability Class - Neutral - l7lFt-26Ft Delta-T (F)

Winds Measured at 30 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 27 14 13 6 0 1 61 NNE 29 35 9 1 1 0 75 NE 23 38 10 0 1 1 73 ENE 31 55 3 4 0 0 93 E 24 43 7 4 1 1 80 ESE 16 21 7 5 2 1 52 SE 9 4 11 2 0 0 26 SSE 4 14 5 0 0 0 23 S 5 17 5 0 0 0 27 SSW 4 19 0 0 0 0 23 SW 9 3 1 0 0 0 13 WSW 9 9 2 0 0 0 20 W 14 32 13 0 0 0 59 WNW 16 44 54 10 0 0 124 NW 10 40 122 57 1 0 230 NNW 23 18 42 11 3 0 97 Variable 3 0 0 0 0 0 3 Total 256 406 304 100 9 4 1079 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: 22 Page 74

SITE: LIMERICK GENERATING STATION - UNITS I & 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, 2012 Limerick Tower 1 Period of Record: October - December 2012 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 24 17 0 42 NNE 12 17 0 29 NE 17 5 0 22 ENE 22 5 0 27 E 10 7 0 17 ESE 6 2 0 10 SE 0 0 0 0 SSE 2 11 0 14 S 6 20 0 27 SSW 7 13 0 20 SW 6 2 0 8 WSW 20 7 0 28 W 38 14 0 53 WNW 41 28 0 73 NW 16 25 0 43 NNW 18 6 0 24 Variable 0 0 0 0 Total 245 179 13 0 0 0 437 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: 22 Page 75

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, 2012 Limerick Tower 1 Period of Record: October - December 2012 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 11 0 11 NNE 5 0 8 NE 6 0 9 ENE 17 0 18 E 14 0 15 ESE 8 0 12 SE 8 0 9 SSE 1 0 1 S 4 0 4 SSW 2 0 4 SW 8 0 9 WSW 7 0 7 W 30 0 33 WNW 35 0 41 NW 28 0 31 NNW 10 0 11 Variable 0 0 0 Total 194 28 1 0 0 0 223 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 cl asses: 22 Page 76

SITE: LIMERICK GENERATING STATION - UNITS 1 & 2 LICENSEE: EXELON GENERATION COMPANY, LLC Table D - 7 Wind Speed by Direction Measured at 30 Feet for Various Stability Classes for the Limerick Generating Station, October - December, 2012 Limerick Tower 1 Period of Record: October - December 2012 Stability Class - Extremely Stable - l7lFt -26Ft Delta-T (F)

Winds Measured at 30 Feet Wind Spe ed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total 0 0 N 20 0 0 0 20 0 0 NNE 8 0 0 0 8 0 0 NE 5 0 0 0 5 0 0 ENE 8 0 0 0 8 0 0 E 3 0 0 0 3 0 0 ESE 5 0 0 0 5 0 0 SE 1 0 0 0 1 0 0 SSE 0 0 0 0 0 0 0 S 2 0 0 0 2 0 0 SSW 5 0 0 0 5 0 0 SW 0 1 0 0 1 0 0 WSW 12 0 0 0 12 0 0 W 47 1 0 0 48 1 0 0 WNW 60 0 0 61 1 0 0 NW 54 0 0 55 1 0 0 NNW 26 0 0 27 0 0 0 Variable 0 0 0 0 Total 256 5 0 0 0 0 261 Hours of calm in this stability class: 18 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 22 Page 77

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, 2012 Limerick Tower 1 Period of Record: October - December 2012 Stability Class - Extremely Unstable - l7lFt-26Ft Delta-T (F)

Winds Measured at 175 Feet Wind SpeEed (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 1 0 0 1 o0 o0 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 S 0 1 3 0 0 0 4 SSW 0 2 5 2 0 0 9 SW 0 1 0 0 0 0 1 WSW 0 0 2 2 0 0 4 W 0 0 3 1 0 0 4 WNW 0 0 1 1 0 0 2 NW 0 1 0 0 0 0 1 NNW 0 0 0 0 0 0 0 Variable 0 0 0 0 0 0 0 Total 0 6 14 6 0 0 26 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: 22 Page 78

SITE: LIMERICK GENERATING STATION - UNITS I & 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, 2012 Limerick Tower 1 Period of Record: October - December 2012 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 1 0 0 0 1 NE 0 0 0 0 0 0 0 ENE 0 0 0 0 0 0 0 E 1 0 0 0 0 0 1 ESE 0 0 0 0 0 0 0 SE 0 0 0 2 0 0 2 SSE 0 0 0 1 0 0 1 S 0 1 1 1 0 0 3 SSW 0 2 4 1 0 0 7 SW 0 0 1 0 0 0 1 WSW 0 0 3 1 0 0 4 W 0 2 3 8 0 0 13 WNW 0 2 3 2 0 0 7 NW 0 0 0 3 1 0 4 NNW 0 0 0 0 0 0 0 Variable 0 0 0 0 0 0 0 Total 1 7 16 19 1 0 44 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: 22 Page 79

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, 2012 Limerick Tower 1 Period of Record: October - December 2012 Stability Class - Slightly Unstable - l7lFt-26Ft Delta-T (F)

Winds Measured at 175 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 2 NNE 0 2 NE 3 7 ENE 0 7 E 0 2 ESE 0 0 SE 0 0 SSE 0 2 S 0 4 SSW 0 1 SW 0 2 WSW 0 4 W 0 7 WNW 0 22 NW 0 16 NNW 0 2 Variable 0 0 Total 3 14 36 25 2 0 80 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 22 Page 80

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, 2012 Limerick Tower 1 Period of Record: October - December 2012 Stability Class - Neutral - l7lFt-26Ft Delta-T (F)

Winds Measured at 175 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 15 15 15 7 9 65 NNE 17 23 22 8 1 72 NE 20 45 21 7 0 95 ENE 26 56 14 4 5 106 E 8 25 26 3 1 64 ESE 8 20 11 4 5 49 SE 5 12 3 11 3 37 SSE 4 4 9 6 1 24 S 4 9 15 4 0 32 SSW 1 7 15 1 0 24 SW 3 4 6 0 1 14 WSW 5 3 18 6 1 33 W 7 5 23 18 7 60 WNW 10 17 31 70 43 180 NW 4 14 44 59 30 157 NNW 3 7 28 28 2 68 Variable 0 0 0 0 0 0 Total 140 266 301 236 109 28 1080 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: 22 Page 81

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, 2012 Limerick Tower 1 Period of Record: October - December 2012 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 9 17 0 0 31 3 2 0 0 32 NNE 9 12 10 1 0 0 33 NE 12 11 10 0 0 0 21 ENE 5 14 2 0 0 0 32 E 5 17 8 2 0 0 9 ESE 4 1 4 0 1 0 0 5 SE 1 3 0 1 0 0 15 SSE 3 2 9 0 0 25 S 0 3 14 8 0 0 21 SSW 0 5 16 0 0 0 17 SW 3 6 8 0 1 0 31 WSW 3 6 18 3 2 0 0 38 W 1 20 15 11 0 0 63 WNW 4 14 34 1 0 0 47 NW 6 16 24 0 0 19 NNW 6 6 7 0 0 0 0 Variable 0 0 0 0 Total 65 145 196 32 1 0 439 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: I Hours of missing stability measurements in all stability classes: 22 Page 82

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, 2012 Limerick Tower 1 Period of Record: October - December 2012 Stability Class - Moderately Stable - l7lFt-26Ft Delta-T (F)

Winds Measured at 175 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total 0 0 11 N 6 0 0 0 13 NNE 4 5 0 0 14 NE 5 7 0 0 8 ENE 2 1 0 0 16 E 8 2 0 0 14 ESE 10 0 0 0 2 SE 2 0 0 0 10 SSE 5 2 0 0 10 S 6 3 0 0 11 SSW 8 2 0 0 5 SW 2 3 0 0 18 WSW 14 1 W 10 7 0 0 21 WNW 16 20 0 .0 41 NW 13 8 0 0 24 NNW 8 1 0 0 16 Variable 0 0 0 0 0 Total 50 119 62 3 0 0 234 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: 22 Page 83

SITE: LIMERICK GENERATING STATION - UNITS 1 & 2 LICENSEE: EXELON GENERATION COMPANY, LLC Table D -8 Wind Speed by Direction Measured at 175 Feet for Various Stability Classes for the Limerick Generating Station, October - December, 2012 Limerick Tower 1 Period of Record: October - December 2012 Stability Class - Extremely Stable - 171Ft- -26Ft Delta-T (F)

Winds Measured at 175 Feet Wind Spei ed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total 0 0 N 8 14 0 0 22 0 0 NNE 3 7 0 0 10 0 0 NE 3 5 0 0 8 0 0 ENE 2 2 0 0 4 0 0 E 2 3 0 0 5 0 0 ESE 2 4 0 0 6 0 0 SE 4 2 0 0 6 0 0 SSE 0 3 0 0 3 1 0 S 1 1 0 0 3 1 0 SSW 2 3 0 0 6 SW 4 2 2 1 0 0 9 WSW 8 6 3 0 0 0 17 W 14 14 2 0 0 0 30 WNW 6 40 16 0 0 0 62 NW 10 34 7 0 0 0 51 NNW 7 25 3 0 0 0 35 Variable 1 0 0 0 0 0 1 Total 77 165 35 1 0 0 278 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: 22 Page 84

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, 2012 Limerick Tower 1 January-December, 2012 30 ft. Wind Speed and Direction 171Ft-26Ft Delta-T (F)

Number of Observations - 7262 Values are Percent Occurrence SPEED ---------------------------------- WIND DIRECTION CLASSES -------------- .................- . . STABILITY CLASSES 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 CLASS 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 EU 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 0.07 0.07 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 0.01 0.00 0.00 0.00 0.00 0.10 0.10 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 0.03 0.00 0.06 0.06 0.22 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 0.01 0.00 0.00 0.01 0.00 0.00 0.00 0.00 0.00 0.01 0.03 0.00 0.01 0.01 0.01 0.11 0.11 1 SU 0.01 0.01 0.03 0.00 0.00 0.00 0.00 0.00 0.04 0.01 0.01 0.01 0.04 0.06 0.01 0.01 0.26 0.26

- N 0.65 0.55 0.62 0.73 0.72 0.44 0.39 0.40 0.39 0.47 0.45 0.51 0.54 0.58 0.51 0.50 8.43 8.43 3 SS 0.72 0.61 0.62 0.78 0.62 0.66 0.36 0.43 0.63 0.70 0.63 1.20 1.51 1.57 0.90 0.67 12.61 12.61 MS 0.55 0.26 0.25 0.41 0.43 0.30 0.25 0.17 0.19 0.28 0.48 0.63 1.31 1.56 1.03 0.63 8.73 8.73 ES 0.83 0.37 0.47 0.37 0.25 0.18 0.10 0.04 0.11 0.14 0.22 0.50 1.56 1.85 1.65 1.12 9.74 9.74 39.88 EU 0.00 0.01 0.00 0.00 0.00 0.00 0.00 0.01 0.21 0.37 0.39 0.17 0.32 0.21 0.12 0.00 1.80 1.80 MU 0.00 0.00 0.00 0.00 0.00 0.03 0.23 0.04 0.15 0.19 0.14 0.12 0.23 0.36 0.12 0.08 1.71 1.71 4 SU 0.01 0.06 0.06 0.12 0.11 0.06 0.10 0.04 0.15 0.21 0.11 0.21 0.30 0.28 0.41 0.10 2.31 2.31

- N 0.90 0.90 1.09 1.62 1.51 0.70 0.45 0.52 0.91 1.18 0.41 0.67 1.31 1.64 2.26 0.94 17.02 17.02 7 SS 0.50 0.47 0.28 0.47 1.01 0.58 0.34 0.81 1.47 1.17 0.41 0.41 1.09 1.45 1.42 0.61 12.48 12.48 MS 0.04 0.08 0.06 0.01 0.04 0.10 0.03 0.01 0.04 0.15 0.06 0.06 0.18 0.29 0.22 0.03 1.39 1.39 ES 0.06 0.00 0.00 0.00 0.00 0.01 0.00 0.00 0.01 0.00 0.03 0.00 0.04 0.08 0.04 0.01 0.29 0.29 37.00 EU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.04 0.06 0.25 0.07 0.08 0.07 0.10 0.03 0.01 0.70 0.70 MU 0.00 0.01 0.00 0.00 0.06 0.03 0.01 0.01 0.03 0.10 0.03 0.10 0.19 0.19 0.29 0.03 1.07 1.07 8 SU 0.00 0.00 0.00 0.00 0.08 0.03 0.01 0.01 0.01 0.08 0.01 0.01 0.11 0.33 0.73 0.36 1.79 1.79

- N 0.58 0.21 0.18 0.10 0.85 0.37 0.19 0.10 0.30 0.12 0.03 0.06 0.90 1.53 4.35 1.75 11.61 1 SS 0.06 11.61 0.26 0.01 0.03 0.37 0.25 0.01 0.07 0.15 0.18 0.06 0.01 0.28 0.23 0.55 0.39 2.91 2 MS 0.00 0.00 2.91 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.00 0.00 0.00 0.00 0.00 0.01 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 18.09 EU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.00 0.00 0.03 0.00 0.00 0.00 0.04 0.04 1 MU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.00 0.00 0.01 0.04 0.04 0.00 0.11 0.11 3 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 0.04 0.08 0.14 0.03 0.29 0.29

- N 0.08 0.01 0.00 0.06 0.07 0.11 0.03 0.00 0.01 0.01 0.00 0.01 0.10 0.56 1.94 0.47 3.47 3.47 1 SS 0.01 0.03 0.00 0.00 0.01 0.00 0.00 0.00 0.01 0.00 0.00 0.00 0.01 0.07 0.14 0.07 0.36 0.36 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 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 4.27 Limerick Tower 1 January-December, 2012 Page 85

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, 2012 30 ft. Wind Speed and Direction 171Ft-26Ft Delta-T (F)

SPEED- --------------------- DIRECTION

-WIND CLASSES STABILITY CLASSES---------- ---------

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

- N 0.00 0.01 0.01 0.00 0.01 0.03 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.03 0.15 0.26 0.26 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 0.00 0.00 0.00 0.00 0.00 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 ES 0.00 0.00 0.26 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 0.01 0.00 0.01 0.00 0.01 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.06 0.06 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 0.06 TOT 5.21 3.66 3.68 4.71 6.17 3.88 2.51 2.71 4.89 5.65 3.57 4.81 10.16 13.07 16.98 7.96 99.78 2.55 3.00 4.65 40.91 28.35 10.23 10.08 99.78 Wind Direction by Stability N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL -STABILITY CLASSES-0.00 0.01 0.00 0.00 0.00 0.00 0.00 0.06 0.26 0.63 0.45 0.25 0.41 0.30 0.15 0.01 2.55 Extremely Unstable 0.00 0.03 0.00 0.00 0.07 0.06 0.25 0.06 0.18 0.30 0.18 0.25 0.44 0.61 0.47 0.12 3.00 Moderately Unstable 0.03 0.07 0.08 0.12 0.19 0.08 0.11 0.06 0.21 0.30 0.14 0.23 0.50 0.74 1.29 0.50 4.65 Slightly Unstable 2.22 1.68 1.91 2.51 3.18 1.67 1.06 1.02 1.61 1.79 0.90 1.25 2.84 4.32 9.09 3.80 40.91 Neutral 1.49 1.16 0.91 1.28 2.01 1.49 0.72 1.31 2.27 2.05 1.10 1. 62 2.89 3.32 3.00 1.74 28.35 Slightly Stable 0.59 0.34 0.30 0.43 0.47 0.40 0.28 0.18 0.23 0.43 0.55 0.70 1.49 1.85 1.25 0.66 10.23 Moderately Stable 0.88 0.37 0.47 0.37 0.25 0.19 0.10 0.04 0.12 0.14 0.25 0.50 1.60 1.93 1.72 1.13 10.08 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 0.22 CALM 2.75 1.82 1.98 2.30 2.02 1.58 1.09 1.03 1.36 1.60 1.82 2.88 4.96 5.62 4.12 2.95 39.88 < 3.5 mph 1.50 1.51 1.47 2.23 2.67 1.47 1.16 1.45 2.95 3.28 1.54 1.64 3.47 4.30 4.60 1.76 37.00 3.6 - 7.5 mph 0.84 0.28 0.19 0.12 1.36 0.67 0.23 0.23 0.55 0.73 0.21 0.26 1.54 2.38 5.95 2.53 18.09 7.6 - 12.5 mph 0.10 0.04 0.00 0.06 0.08 0.11 0.03 0.00 0.03 0.04 0.00 0.01 0.19 0.76 2.26 0.56 4.27 12.6 - 18.5 mph 0.00 0.01 0.01 0.00 0.01 0.03 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.03 0.15 0.26 18.6 - 24.5 mph 0.01 0.00 0.01 0.00 0.01 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.06 > 24.5 mph Page 86

SITE: LIMERICK GENERATING STATION - UNITS I & 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, 2012 Limerick Tower 1 January-December, 2012 175 ft. Wind Speed and Direction 171Ft-26Ft Delta-T (F)

Number of Observations = 7308 Values are Percent Occurrence WIN D DIRE CT ION CLASSE S ---- -- ------ --- --------- ---- --- --- STABILITY CLASSES SPEED TOTAL WSW W WNW NW NNW TOTAL EU MU SU N SS MS ES CLASS N NNE NE ENE E ESE SE SSE S SSW SW 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 0.00 0.00 0.00 0.00 0.00 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 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 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 0.01 0.01 0.01 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 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.00 0.00 0.03 0.03 I SU 0.01 0.01 0.04 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 0.08 0.08

- N 0.26 0.30 0.48 0.51 0.23 0.29 0.26 0.12 0.23 0.15 0.21 0.26 0.23 0.27 0.18 0.11 4.09 4.09 3 SS 0.12 0.23 0.33 0.23 0.23 0.15 0.10 0.18 0.12 0.11 0.11 0.10 0.10 0.18 0.22 0.18 2.68 2.68 MS 0.12 0.11 0.05 0.16 0.11 0.14 0.07 0.11 0.07 0.08 0.03 0.07 0.11 0.15 0.21 0.14 1.72 1.72 ES 0.23 0.12 0.08 0.14 0.12 0.04 0.12 0.05 0.10 0.15 0.19 0.22 0.34 0.25 0.31 0.21 2.68 2.68 11.29 EU 0.00 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.04 0.12 0.11 0.01 0.01 0.03 0.04 0.00 0.38 0.38 MU 0.01 0.00 0.00 0.00 0.00 0.00 0.03 0.04 0.04 0.10 0.07 0.05 0.08 0.11 0.01 0.03 0.57 0.57 4 SU 0.03 0.03 0.04 0.10 0.04 0.03 0.04 0.01 0.08 0.11 0.08 0.05 0.14 0.15 0.07 0.03 1.03 1.03

- N 0.56 0.75 1.07 1.42 1.04 0.60 0.38 0.29 0.51 0.71 0.41 0.41 0.42 0.74 0.71 0.36 10.39 10.39 7 SS 0.31 0.38 0.33 0.96 0.78 0.37 0.45 0.36 0.59 0.64 0.68 0.49 0.77 1 .11 0.75 0.34 9.32 9.32 MS 0.27 0.25 0.18 0.15 0.16 0.21 0.04 0.14 0.29 0.29 0.29 0.48 0.67 1.11 0.67 0.22 5.41 5.41 ES 0.30 0.21 0.08 0.19 0.12 0.12 0.07 0.04 0.18 0.26 0.25 0.34 0.66 1.56 0.97 0.52 5.87 5.87 32.96 EU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.15 0.34 0.23 0.15 0.30 0.16 0.00 0.03 1.37 1.37 MU 0.00 0.01 0.00 0.00 0.04 0.03 0.15 0.04 0.10 0.14 0.08 0.14 0.18 0.10 0.25 0.04 1.29 1.29 6 SU 0.00 0.03 0.01 0.03 0.11 0.05 0.05 0.05 0.10 0.11 0.07 0.16 0.12 0.40 0.36 0.18 1.83 1.83

- N 0.99 0.55 0.53 0.41 1.38 0.57 0.27 0.37 0.68 0.78 0.36 0.60 0.78 1.53 2.07 1.12 13.00 13.00 I SS 0.74 0.36 0.29 0.14 0.89 0.51 0.40 0.62 1.19 1.35 0.55 0.74 0.86 1.74 1.35 0.63 12.34 12.34 2 MS 0.11 0.11 0.11 0.01 0.07 0.05 0.04 0.04 0.11 0.22 0.26 0.34 0.27 0.88 0.44 0.10 3.16 3.16 ES 0.05 0.05 0.00 0.00 0.00 0.04 0.01 0.01 0.03 0.07 0.12 0.12 0.11 0.92 0.29 0.07 1.90 1.90 34.89 EU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.04 0.04 0.14 0.12 0.11 0.11 0.08 0.00 0.00 0.64 0.64 1 MU 0.00 0.00 0.00 0.00 0.00 0.00 0.03 0.01 0.03 0.10 0.05 0.10 0.29 0.23 0.07 0.01 0.92 0.92 3 SU 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.00 0.10 0.03 0.05 0.11 0.45 0.40 0.19 1.35 1.35

- N 0.29 0.21 0.14 0.07 0.31 0.26 0.21 0.08 0.19 0.22 0.03 0.26 0.83 2.03 2.55 1.33 8.99 8.99 1 SS 0.27 0.14 0.01 0.00 0.16 0.12 0.11 0.04 0.33 0.23 0.23 0.14 0.37 0.47 0.26 0.18 3.07 3.07 8 MS 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.01 0.04 0.00 0.03 0.04 0.00 0.14 0.14 ES 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.00 0.03 0.00 0.01 0.10 0.01 0.00 0.16 0.16 15.27 Page 87

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, 2012 Limerick Tower 1 January-December, 2012 175 ft. Wind Speed and Direction 171Ft-26Ft Delta-T (F)

SPEED ----------- WIND DIRECTION CLASSES CLASSES CLASS N NNE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL EU MU SU N SS MS ES TOTAL NE ENE 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.05 0.03 0.01 0.00 0.00 0.00 0.11 0.11 EU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.01 0.01 0.03 0.03 0.04 0.00 0.14 0.14 1 MU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.07 0.04 0.10 0.01 0.22 0.22 9 SU 0.00 0.00 0.00 0.00 0.11 0.05 0.07 0.00 0.04 0.05 0.04 0.30 1.14 1.08 0.25 3.41 3.41

- N 0.16 0.01 0.00 0.07 0.03 0.01 0.01 0.00 0.03 0.11 0.08 0.01 0.10 0.18 0.10 0.04 0.74 0.74 2 SS 0.01 0.04 0.00 0.00 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 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 4.61 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 0.03 0.00 0.00 0.00 0.03 0.03 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 0.03 0.00 0.00 0.03 0.03 T SU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.03 0.07 0.00 0.00 0.10 0.10 N 0.05 0.01 0.03 0.01 0.01 0.01 0.04 0.00 0.00 0.00 0.00 0.01 0.10 0.26 0.11 0.10 0.75 0.75 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 0.03 0.01 0.00 0.04 0.04 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 0.94 TOT 4.94 3.93 3.80 4.60 5.88 3.72 2.94 2.74 5.23 6.70 4.80 5.56 8.54 16.54 13.66 6.39 99.99 2.53 2.97 4.61 40.63 28.19 10.43 10.63 99.99 Wind Direction by Stability N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL -STABILITY CLASSES-0.00 0.01 0.00 0.00 0.00 0.00 0.00 0.04 0.23 0.62 0.52 0.30 0.47 0.27 0.04 0.03 2.53 Extremely Unstable 0.01 0.01 0.00 0.00 0.05 0.03 0.21 0.10 0.16 0.34 0.22 0.30 0.57 0.51 0.37 0.08 2.97 Moderately Unstable 0.05 0.07 0.10 0.12 0.15 0.08 0.10 0.08 0.18 0.31 0.18 0.27 0.47 1.12 0.92 0.41 4.61 Slightly Unstable 2.31 1.83 2.24 2.49 3.01 1.85 1.22 0.93 1.61 1.90 1.05 1.59 2.67 5.97 6.69 3.26 40.63 Neutral 1.46 1.15 0.96 1.33 2.08 1.16 1.07 1.19 2.26 2.45 1.66 1.48 2.19 3.69 2.70 1.37 28.19 Slightly Stable 0.51 0.47 0.34 0.33 0.34 0.40 0.15 0.29 0.47 0.60 0.59 0.93 1.05 2.16 1.35 0.45 10.43 Moderately Stable 0.59 0.38 0.16 0.33 0.25 0.21 0.21 0.11 0.31 0.48 0.59 0.68 1.12 2.82 1.59 0.79 10.63 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 0.01 CALM 0.75 0.78 0.99 1.04 0.71 0.62 0.55 0.47 0.52 0.49 0.53 0.64 0.78 0.88 0.92 0.63 11.29 < 3.5 mph 1.49 1.63 1.70 2.82 2.15 1.33 1.01 0.88 1.72 2.23 1.89 1.85 2.75 4.80 3.23 1.49 32.96 3.6 - 7.5 mph 1.89 1.11 0.94 0.59 2.49 1.26 0.93 1.14 2.35 3.01 1.67 2.26 2.63 5.72 4.75 2.16 34.89 7.6 - 12.5 mph 0.57 0.34 0.15 0.07 0.48 0.38 0.34 0.19 0.60 0.79 0.51 0.70 1.72 3.38 3.33 1.71 15.27 12.6 - 18.5 mph 0.18 0.05 0.00 0.07 0.04 0.12 0.07 0.07 0.03 0.18 0.21 0.10 0.51 1.38 1.31 0.30 4.61 18.6 - 24.5 mph 0.05 0.01 0.03 0.01 0.01 0.01 0.04 0.00 0.00 0.00 0.00 0.01 0.15 0.38 0.12 0.10 0.94 > 24.5 mph Page 88

SITE: LIMERICK GENERATING STATION - UNITS I & 2 LICENSEE: EXELON GENERATION COMPANY, LLC Table D - 11 Annual x/Q and D/Q values for the North Stack, Limerick Generating Station, 2012 Limerick Generating Station x/Q and D/Q values North Stack- Flow = 3160()0 cfm X/Q (s/mA3) D/Q (1/mA2)

Stack ID Location Direction Range (m) Undepleted N Site Boundary S 762 1.11E-07 1.20E-09 N Site Boundary SSW 762 7.74E-08 7.68E-1 0 N Site Boundary SW 884 4.87E-08 4.49E-10 N Site Boundary WSW 854 7.15E-08 6.59E-10 N Site Boundary W 854 1.38E-07 1.44E-09 N Site Boundary WNW 793 1.02E-07 1.27E-09 N Site Boundary NW 762 8.68E-08 1.1 5E-09 N Site Boundary NNW 884 9.69E-08 1.16E-09 N Site Boundary N 884 1.38E-07 1.53E-09 N Site Boundary NNE 793 1.75E-07 2.43E-09 N Site Boundary NE 793 9.58E-08 1.59E-09 N Site Boundary ENE 793 8.08E-08 1.12E-09 N Site Boundary E 762 2.17E-07 2.94E-09 N Site Boundary ESE 762 3.76E-07 4.95E-09 N Site Boundary SE 762 6.64E-07 9.57E-09 N Site Boundary SSE 1006 1.79E-07 2.44E-09 N RR-Inf-Lck-NG S 300 4.77E-07 4.26E-09 N RR-Inf-Lck-NG SSW 225 5.63E-07 3.93E-09 N RR-Inf-Lck-NG SW 225 4.26E-07 2.76E-09 N RR-Inf-Lck-NG WSW 345 2.68E-07 2.07E-09 N RR-Inf-Lck-NG W 225 1.14E-06 8.83E-09 N RR-Inf-Lck-NG WNW 345 3.56E-07 3.68E-09 N RR-Inf-Lck-NG NW 450 1.69E-07 2.04E-09 N RR-Inf-Lck-NG ESE 884 3.13E-07 4.08E-09 N RR-Inf-Lck-NG WSW 450 1.68E-07 1.44E-09 N RR-Inf-Lck-NG NNE 682 2.11E-07 2.90E-09 N Inhalation N 948 1.27E-07 1.41 E-09 N Inhalation NNE 825 1.66E-07 2.32E-09 N Inhalation NE 1057 6.63E-08 1.16E-09 N Inhalation ENE 985 6.32E-08 9.OOE-10 N Inhalation E 873 1.84E-07 2.50E-09 N Inhalation ESE 1047 2.55E-07 3.31 E-09 N Inhalation SE 1557 2.93E-07 3.78E-09 N Inhalation SSE 1647 1.11 E-07 1.36E-09 N Inhalation S 1325 5.82E-08 6.73E-10 N Inhalation SSW 1543 3.76E-08 4.13E-10 N Inhalation SW 991 4.20E-08 4.10E-10 N Inhalation WSW 1158 4.99E-08 5.37E-10 N Inhalation W 1105 1.02E-07 1.10E-09 N Inhalation WNW 1198 6.32E-08 7.99E-1 0 Page 89

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, 2012 Limerick Generating Station x/Q and D/Q values North Stack - Flow = 316000 cfm X/Q (s/mA3) D/Q (1/m^2)

Stack ID Location Direction Ranae (m) Undeoleted N Inhalation NW 1104 5.82E-08 7.72E-10 N Inhalation NNW 1540 5.29E-08 6.42E-10 N Vegetation N 1017 1.17E-07 1.31E-09 N Vegetation NNE 2929 6.48E-08 4.53E-10 N Vegetation NE 1065 6.56E-08 1.15E-09 N Vegetation ENE 4561 4.85E-08 1.52E-10 N Vegetation E 3849 9.26E-08 4.12E-10 N Vegetation ESE 555 5.75E-07 7.51 E-09 N Vegetation SE 390 1.74E-06 2.47E-08 N Vegetation SSE 2102 9.61 E-08 9.94E-10 N Vegetation S 1860 4.90E-08 4.90E-10 N Vegetation SSW 1622 3.68E-08 3.93E-10 N Vegetation SW 1390 3.05E-08 3.61E-10 N Vegetation WSW 3662 4.70E-08 2.27E-10 N Vegetation W 1283 8.87E-08 9.82E-10 N Vegetation WNW 1198 6.32E-08 7.99E-1 0 N Vegetation NW 2490 3.60E-08 2.99E-10 N Vegetation NNW 2166 4.54E-08 4.12E-10 N Meat N 7551 3.83E-08 9.37E-1 1 N Meat ENE 6264 4.44E-08 9.56E-1 1 N Meat SE 3331 1.68E-07 1.33E-09 N Meat S 6741 3.85E-08 9.53E-1 1 N Meat SSW 3167 3.68E-08 1.96E-10 N Meat SW 5653 3.17E-08 9.26E-11 N Meat WSW 4321 4.60E-08 1.87E-10 N Meat W 4467 5.80E-08 2.68E-10 N Cow N 7551 3.83E-08 9.37E-1 1 N Cow S 6741 3.85E-08 9.53E-1 1 N Cow SSW 3167 3.68E-08 1.96E-10 N Cow WSW 4321 4.60E-08 1.87E-10 N Cow W 4467 5.80E-08 2.68E-10 N Garden ESE 2198 1.44E-07 1.30E-09 N Garden SE 1972 2.42E-07 2.74E-09 Page 90

SITE: LIMERICK GENERATING STATION - UNITS 1 & 2 LICENSEE: EXELON GENERATION COMPANY, LLC Table D - 12 Annual x/Q and D/Q values for the South Stack, Limerick Generating Station, 2012 Limerick Generating Station x/Q and D/Q values South Stack - Flow = 187000 cfm X/Q (slmA3) D/Q (I/mA2)

Stack ID Location Direction Range (m) Undepleted Site Boundary S 762 6.18E-08 8.14E-10 Site Boundary SSW 762 3.79E-08 4.90E-10 Site Boundary Sw 884 2.34E-08 3.03E-10 Site Boundary WSW 854 2.80E-08 3.93E-10 Site Boundary W 854 7.94E-08 1.02E-09 Site Boundary WNW 793 5.42E-08 9.18E-10 Site Boundary NW 762 5.40E-08 9.20E-10 Site Boundary NNW 884 5.73E-08 9.20E-10 Site Boundary N 884 7.97E-08 1.17E-09 Site Boundary NNE 793 1.02E-07 1.95E-09 Site Boundary NE 793 6.OOE-08 1.36E-09 Site Boundary ENE 793 4.27E-08 8.92E-10 Site Boundary E 762 1.24E-07 2.21 E-09 Site Boundary ESE 762 2.06E-07 3.47E-09 Site Boundary SE 762 3.65E-07 6.20E-09 Site Boundary SSE 1006 1.11 E-07 1.77E-09 RR-Inf-Lck-NG S 300 2.50E-07 2.50E-09 RR-Inf-Lck-NG SSW 225 2.55E-07 2.08E-09 RR-Inf-Lck-NG SW 225 1.89E-07 1.56E-09 RR-Inf-Lck-NG WSW 345 9.36E-08 9.15E-10 RR-Inf-Lck-NG W 225 6.14E-07 5.32E-09 RR-Inf-Lck-NG WNW 345 1.69E-07 2.24E-09 RR-Inf-Lck-NG NW 450 8.94E-08 1.47E-09 RR-Inf-Lck-NG ESE 884 11.78E-07 2.97E-09 RR-Inf-Lck-NG WSW 450 5.88E-08 6.72E-10 RR-Inf-Lck-NG NNE 682 1.19E-07 2.26E-09 Inhalation N 948 7.46E-08 1.09E-09 Inhalation NNE 825 9.78E-08 1.87E-09 Inhalation NE 1057 4.44E-08 1.03E-09 Inhalation ENE 985 3.63E-08 7.43E-10 Inhalation E 873 1.09E-07 1.93E-09 Inhalation ESE 1047 1.54E-07 2.51 E-09 Inhalation SE 1557 2.15E-07 3.07E-09 Inhalation SSE 1647 8.70E-08 1.14E-09 Inhalation S 1325 3.95E-08 5.36E-1 0 Inhalation SSW 1543 2.65E-08 3.38E-10 Inhalation SW 991 2.1OE-08 2.90E-1 0 Inhalation WSW 1158 2.40E-08 3.87E-10 Inhalation W 1105 6.44E-08 8.39E-10 Inhalation WNW 1198 3.95E-08 6.38E-10 Inhalation NW 1104 4.10E-08 I 6.56E-10 Inhalation Page 91

SITE: LIMERICK GENERATING STATION - UNITS 1 & 2 LICENSEE: EXELON GENERATION COMPANY, LLC Table D - 12 Annual xJQ and D/Q values for the South Stack, Limerick Generating Station, 2012 Limerick Generating Station x/Q and D/Q values South Stack - Flow = 1870 00 cfm X/Q (s/mA3) D/Q (1/mA2)

Stack ID Location Direction Range (m) Undepleted S Inhalation NNW 1540 3.83E-08 5.56E-10 S Vegetation N 1017 7.01E-08 1.02E-09 S Vegetation NNE 2929 6.18E-08 4.1OE-10 S Vegetation NE 1065 4.41E-08 1.02E-09 S Vegetation ENE 4561 5.17E-08 1.46E-10 S Vegetation E 3849 9.60E-08 3.86E-10 S Vegetation ESE 555 2.93E-07 4.87E-09 S Vegetation SE 390 8.99E-07 1.37E-08 S Vegetation SSE 2102 8.41E-08 8.72E-10 S Vegetation S 1860 4.14E-08 4.22E-10 S Vegetation SSW 1622 2.71E-08 3.25E-10 S Vegetation SW 1390 1.99E-08 2.98E-10 S Vegetation WSW 3662 4.95E-08 2.16E-10 S Vegetation W 1283 6.07E-08 7.85E-10 S Vegetation WNW 1198 3.95E-08 6.38E-10 S Vegetation NW 2490 3.48E-08 2.76E-1 0 S Vegetation NNW 2166 3.95E-08 3.67E-10 S Meat N 7551 3.92E-08 8.82E-11 S Meat ENE 6264 4.73E-08 9.21E-11 S Meat SE 3331 1.59E-07 1.22E-09 S Meat S 6741 4.08E-08 9.07E-1 1 S Meat SSW 3167 3.73E-08 1.78E-10 S Meat SW 5653 3.39E-08 8.98E-1 1 S Meat WSW 4321 4.88E-08 1.80E-10 S Meat W 4467 6.01E-08 2.55E-10 S Cow N 7551 3.92E-08 8.82E-1 1 S Cow S 6741 4.08E-08 9.07E-11 S Cow SSW 3167 3.73E-08 1.78E-10 S Cow WSW 4321 4.88E-08 1.80E-10 S Cow W 4467 6.01E-08 2.55E-10 S Garden ESE 2198 1.27E-07 1.14E-09 S Garden SE 1972 1.98E-07 2.34E-09 Page 92

SITE: LIMERICK GENERATING STATION - UNITS I & 2 LICENSEE: EXELON GENERATION COMPANY, LLC Appendix D ODCM Revision 26 Changes Page 93

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

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SITE: LIMERICK GENERATING STATION - UNITS I & 2 LICENSEE: EXELON GENERATION COMPANY, LLC Change Matrix for 00CM Revision 26 Change Type - A Administrative Changes Change Type - T Technical Changes Item .I I Rev 25 Rev 26 Change and Reason Change No. Page Tvoe0 Page TVDO j=-T

1. 7 7 Combined Table of Contents Sections 1.2.2 and 1.2.3. A Reason:

2. 20 20 Changed Applicability wording from 'At all times' to 'As shown A in Table 3.1-1.

Reason:

A column for applicability of radiation monitor actions has been added.

3. 21 21 Added a column for applicability A Reason:

There have been questions on applicability when systems are drained. This change will clarify when the action statements apply.

4. 22 22 Action 101 A Wording revised to reflect wording provided in NUREG 1302.

Reason:

NUREG 1302, "Offsite Dose Calculation Manual Guidance:

Standard Radiological Effluent Controls for Boiling Water Reactors." Is used as a standard for implementing the ODCM.

Chemistry procedure CY-AA-170-300, Offsite Dose Calculation Manual Administration directs that the ODCM use the guidance of this NUREG.

Using the guidance in this NUREG provides clarified guidance

_ _ when monitors are declared inoperable for long periods of time.

5. 54 54 Replaced thermoluminescent (TLD) with dosimeter (meaning A 112 112 OSL, TLD, or similar).

336 321 Reason:

Dosimeter type has changed from a TLD to an OSL type dosimeter. This change to a generic term will incorporate any future changes of dosimeter types.

6. 111 il Changed subscript of the total dose at receptor from Di-rw to A Dm. This change was made to equations 4-1, 4-2, and 4-3.

Reason:

Dosimeter type has changed from a TLD to an OSL type dosimeter. This change to a generic term will incorporate any future changes of dosimeter types.

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SITE: LIMERICK GENERATING STATION - UNITS 1 & 2 LICENSEE: EXELON GENERATION COMPANY, LLC Change Matrix for ODCM Revision 26 Change Type - A Administrative Changes Change Type - T Technical Changes Item Rev 25 Rev 26 Change and Reason Change No. Page Page Type

7. 204 189 Adjusted value of Tb for Approximate midpoint of facility T operating life (years). The Approximate midpoint of facility operating life (years) changed from 15 years to 25 years.

Reason:

Reg Guide 1.109 App A, Equation A-4 adjusted for license renewal.

8. 238-253 223-238 Changed Tables 112-10, 112-11,112-12, 112-13 heading from A Vegetation to Green Leafy Vegetation.

Reason:

Changed to make it a more descriptive heading.

9. 154-158 149-152 Adjusted Adult Shoreline Arr Dose Factors. A 169-173 161-164 Adjusted Teen Shoreline AIT Dose Factors.

184-188 173-176 Adjusted Child Shoreline AIT Dose Factors.

Reason:

Changed because of rounding and typos.

10. 222-225 207-210 Adjusted Adult Ground Plane R, Dose Factors. A 226-229 211-214 Adjusted Teen Ground Plane R, Dose Factors.

230-233 215-218 Adjusted Child Ground Plane R, Dose Factors.

234-237 219-222 Adjusted Infant Ground Plane R, Dose Factors.

Reason:

_ _Changed because of rounding and typos.

11. 238-241 223-226 Adjusted Adult Leafy Vegetation R, Dose Factors. A 242-245 227-230 Adjusted Teen Leafy Vegetation R, Dose Factors.

246-249 231-234 Adjusted Child Leafy Vegetation R, Dose Factors.

Reason:

Changed because of rounding and typos.

12. 254-257 239-242 Adjusted Adult Meat R, Dose Factors. A 258-261 243-246 Adjusted Teen Meat R, Dose Factors.

262-265 247-250 Adjusted Child Meat R, Dose Factors.

266-269 Reason:

I Changed because of rounding and typos.

13. 270-273 255-258 Adjusted Adult Cow Milk R, Dose Factors. A 274-277 259-262 Adjusted Teen Cow Milk R, Dose Factors.

278-281 263-266 Adjusted Child Cow Milk R, Dose Factors.

282-285 267-270 Adjusted Infant Cow Milk R, Dose Factors.

Reason:

Changed because of rounding and typos. _ _

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SITE: LIMERICK GENERATING STATION - UNITS I & 2 LICENSEE: EXELON GENERATION COMPAN*Y, LLC Change Matrix for ODCM Revision 26 Change Type - A Administrative Changes Change Type - T Technical Changes Item Rev 25 Rev 26 Change and Reason Change No. Page Page Type

14. 286-289 271-274 Adjusted Adult Goat Milk R, Dose Factors. A 290-293 275-278 Adjusted Teen Goat Milk R, Dose Factors.

294-297 279-282 Adjusted Child Goat Milk R, Dose Factors.

298-301 283-286 Adjusted Infant Goat Milk R, Dose Factors.

Reason:

Changed because of rounding and typos.

15. 322 307 Adjusted value of t for Period of buildup of activity in soil (sec). T This is the number is seconds in 25 years. This was adjusted due to the approximate midpoint of facility operating life (years) changing from 15 years to 25 years.

Reason:

Reg Guide 1.109 App C, Equation C-I adjusted for license renewal.

16. 322 307 Adjusted value of Tb for Approximate midpoint of facility T operating life (years). The Approximate midpoint of facility operating life (years) changed from 15 years to 25 years.

Reason:

Reg Guide 1.109 App C, Equation C-I adjusted for license renewal.

17. 323 308 Updated X/Q and D/Q factors T Reason:

2011 Meteorology data indicated that the W sector garden had the highest X/Q and D/Q, therefore should be used as the ODCM sector values.

18. 324 309 Asterisks added to ESE and SE Vegetation Pathway. A Reason:

Asterisks indicate those gardens are the REMP Gardens.

19. 331 316 Added NPDES Outfall 001 to the Radwaste schematic. A Reason:

Provides clarification of the actual release point identification.

20. 337 322 Removed 13C1 and added 15D1 and associated location A under Airborne Particulates and Iodine.

Reason:

13C1 was removed because it was located in the middle of a housing complex. 15D1 replaced it because it is located in the same SE sector at a similar distance. 15D1 location was already equipped with an air sampler.

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