ML11124A101

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2010 Annual Radioactive Effluent Release Report
ML11124A101
Person / Time
Site: LaSalle  Constellation icon.png
Issue date: 04/26/2011
From: Rhoades D P
Exelon Generation Co, Exelon Nuclear
To:
Document Control Desk, Office of Nuclear Reactor Regulation
References
RA11-021
Download: ML11124A101 (95)
v • d • e


Text

Exeikn.LaSalle Generating Station www.exeloncorp.com 26ol North 21st Road Nuclear Marseilles, I L 61341-9757 RA1 1-021 10 CFR 50.36a April 26, 2011 U. S. Nuclear Regulatory Commission Attention:

Document Control Desk Washington, D.C. 20555 LaSalle County Station, Units 1 and 2 Facility Operating License Nos. NPF-1 1 and NPF-1 8 NRC Docket Nos. 50-373 and 50-374

Subject:

2010 Annual Radioactive Effluent Release Report Enclosed is the Exelon Generation Company, LLC, 2010 Annual Radioactive Effluent Release Report for LaSalle County Station, submitted in accordance with 10 CFR 50.36a, "Technical specifications on effluents from nuclear power reactors," paragraph (a)(2), and Technical Specification 5.6.3, "Radioactive Effluent Release Report." Should you have any questions concerning this letter, please contact Mr. Terrence Simpkin, Regulatory Assurance Manager, at (815) 415-2800.Respectfully, David P. Rhoades Site Vice President LaSalle County Station

Attachment:

2010 Effluent and Waste Disposal Annual Report cc: Regional Administrator

-NRC Region III NRC Senior Resident Inspector

-LaSalle County StationýQOo JLoo&9"N. g-LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2010)SUPPLEMENTAL INFORMATION

1. Regulatory Limits a. Gaseous Effluents 1) The air dose due to noble gases released in gaseous effluents, from each reactor unit, from the site shall be limited to the following:

a) During any calendar quarter: Less than or equal to 5 mrad for gamma radiation and less than or equal to 10 mrad for beta radiation, and b) During any calendar year: Less than or equal to 10 mrad for gamma radiation and less than or equal to 20 mrad for beta radiation.

2) The dose to an individual from radioiodines and radioactive materials in particulate form, and radionuclides, other than noble gases, with half-lives greater than eight days in gaseous effluents released, from each reactor unit, from the site shall be limited to the following:

a) During any calendar quarter: Less than or equal to 7.5 mRem to any organ, and b) During any calendar year: Less than or equal to 15 mRem to any organ.b. Liquid Effluents 1) The dose or dose commitment to an individual from radioactive materials in liquid effluents released, from each reactor unit, from the site shall be limited: a) During any calendar quarter: Less than or equal to 1.5 mRem to the total body and to less than or equal to 5 mRem to any organ, and b) During any calendar year: Less than or equal to 3 mRem to the total body and to less than or equal to 10 mRem to any organ.c. Total Dose 1) The dose or dose commitment to any member of the public, due to releases or radioactivity and radiation, from uranium fuel cycle sources shall be limited to less than or equal to 25 mRem to the body or any organ (except the thyroid, which shall be limited to less than or equal to 75 mRem) over 12 consecutive months.2. Allowable Concentrations

a. Gaseous Effluents 1) The dose rate due to radioactive materials released in gaseous effluents from the site shall be limited to the following:

a) For noble gases: Less than or equal to 500 mRem/year to the total body andless than or equal to 3000 mRem/year to the skin, and b) For all radioiodines and for all radioactive materials in particulate form, and radionuclides, other than noble gases, with half-lives greater than eight days: Less than or equal to 1500 mRem/year to any organ via the inhalation pathway.b. Liquid Effluents Page 1 of 94 LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2010)SUPPLEMENTAL INFORMATION

1) The concentration of radioactive material released from the site shall be limited to ten (10)times the concentrations specified in 10 CFR Part 20, Appendix B, Table II, Column 2 for radionuclides other than dissolved or entrained noble gases. For dissolved or entrained noble gases, the concentration shall be limited to the following:

Nuclide DWC (uci/ml)Kr-85m 2.00E-04 Kr-85 5.00E-04 Kr-87 4.00E-05 Kr-88 9.00E-05 Ar-41 7.OOE-05 Xe-131m 7.00E-04 Xe- 133m 5.OOE-04 Xe-133 6.OOE-04 Xe-135m 2.OOE-04 Xe- 135 2.00E-04 3. Average Energy 1) Not applicable

-average energy is no longer used to determine dose to the public.4. Measurements and Approximations of Total Radioactivity

a. Gaseous Effluents 1) Containment Vent and Purge System is sampled by grab sample, which is analyzed for principal gamma emitters and H-3.2) Main Vent Stack is sampled by grab sample, which is analyzed for principal gamma emitters and H-3.3) Standby Gas Treatment System is sampled by grab sample, which is analyzed for principal gamma emitters.4) All release types as listed in I and 2 above are sampled at the vent stack, and those listed in 3 above are sampled at the Standby Gas Treatment System whenever there is flow. These effluents are continuously sampled by charcoal cartridge and particulate filter paper, which are analyzed for iodines and principal gamma emitters.

Particulate filter papers are composited and analyzed for gross alpha, Sr-89 and Sr-90. Noble gases, gross beta and gamma are continuously monitored by noble gas monitors for the vent stack and the standby gas treatment system.5) Batch releases resultant from activities related to the Ul CY leak were sampled by grab sample, and were analyzed for principal gamma emitters and tritium.6) The LaSalle County Nuclear Power Station Estimate of 1.84E+01 Ci of C-14 is based upon the value obtained from the LaSalle Station Final Environmental Statement.

Quantification of C- 14 and inclusion of C- 14 in dose calculations has not been required or performed in previous reports. C- 14 is now included and presented in accordance with current industry initiatives and NRC guidance.b. Liquid Effluents 1) Batch waste release tanks are sampled each batch for principal gamma emitters, I- 131, dissolved and entrained noble gases, H-3, gross alpha, Sr-89, Sr-90 and Fe-55.Page 2 of 94 LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2010)SUPPLEMENTAL INFORMATION

2) Continuous releases are sampled continuously in proportion to the rate of flow of the effluent stream and by grab sample. Samples are analyzed for principal gamma emitters, l- 131, dissolved and entrained noble gases, H-3, gross alpha, Sr-89, Sr-90 and Fe-55.5. Batch Releases a. Gaseous 1) Number of batch releases:

2 2) Total time period for batch releases:

7.68E+02 hours 3) Maximum time period for a batch release: 4.80E+02 hours 4) Average time period for batch releases:

3.84E+02 hours 5) Minimum time period for a batch release: 2.88E+02 hours b. Liquid 1) Number of batch releases:

None 2) Total time period for batch releases:

Min. N/A 3) Maximum time period for a batch release: Min. N/A 4) Average time period for batch releases:

Min. N/A 5) Minimum time period for a batch release: Min. N/A 6) Average stream flow during periods of release of effluent into a flowing stream: gpm N/A 6. Abnormal Releases a. Gaseous 1) Number of releases:

2 2) Total activity released:

7.18E-03 Ci b. Liquid 1) Number of releases:

None 2) Total activity released:

N/A 7. Process Control Program In the 2010 period, there were no changes to the Process Control Program (PCP) implementation, processing systems or components.

8. Effluent Monitoring Instrumentation timeclocks and sample anomalies.
a. Time clocks: Page 3 of 94 LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2010)SUPPLEMENTAL INFORMATION There were no effluent monitoring time clocks exceeded in 2010.b. Sample anomalies:

There were no sampling anomalies affecting the measurement of effluents experienced during 2010.During the June and July of 2010, a leak from the UI Cycled Condensate (CY) tank was identified and remediated.

Upon confirmation of a leak, this issue was documented in the Corrective Actions Program (CAP) and the proper reports and notifications made to Regulatory agencies and stakeholders.

After isolating the U 1 CY tank, the tank was drained, repaired, and returned to service. Estimations concluded that 2.OE-0 1 Ci of tritium were released as a result of this leak with no tritium found to have migrated offsite. Remediation activities include installation of additional groundwater monitoring wells, increased ground water sampling frequency, and natural monitored attenuation (NMA). Due to the fact that no tritium has been found to have migrated offsite, no liquid radiological release was reported for 2010.Two gaseous gound level batch releases were reported during the 20 10 period. First, due to the U I CY leak, the CY berm which retained some of the leaked tritiated water was observed to have evaporated during remediation activities.

For the purposes of radiological impact on man, the entire contents of the CY berm were assumed to have evaporated as a ground level batch release.Also, after the UI CY tank was drained for maintenance, air samples were taken at the tank hatch.For the purposes of radiological impact on man, the entire atmosphere of the CY tank at the highest concentrations observed was assumed to have evacuated as a ground level batch release.The contribution from these releases to annual dose has been included in the totals.9. Offsite Dose Calculation Manual Revisions.

There was one revision made to the ODCM in 2010. Changes included editorial/grammatical corrections, and changes related to the implementation of the new Independent Spent Fuel Storage Installation (ISFSI).Each change had a determination performed, in accordance with ODCM revision procedures, to ensure the change would not adversely impact accuracy or reliability of effluent, dose or set point calculations and will maintain the level of radiological effluent controls established by regulatory requirements.

The determinations indicated no adverse impacts.A copy of the ODCM Cange Summary Matrix for revision 2 has been included as Appendix A to this report. Also, a copy of revision 2 to the ODCM has been included as Appendix B to this report. All changes in revision 2 to the LaSalle Station ODCM became effective 06/15/2010.

Page 4 of 94 LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2010)UNITS ONE AND TWO DOCKET NUMBERS 50-373 AND 50-374 GASSEOUS EFFLENTS SUMMATION OF ALL RELEASES Units 1st Qtr 2nd Qtr 3rd Qtr 41n Qtr Estimated Total Error %A. Fission and Activation Gas 1. Total Release Activity Ci 6.01 E+02 3.87E+02 3.88E+02 5.39E+02 2.50E+01 2. Average Release Rate uCi/sec 7.64E+01 4.92E+01 4.88E+01 6.78E+01 3. Percent of Technical Specification

%*....Limit B. Iodine 1. Total 1-131 Activity Ci 1.56E-02 3.78E-03 5.43E-03 6.33E-03 1.50E+01 2. Average Release Rate uCi/sec 1.99E-03 4.81 E-04 6.84E-04 7.97E-04 3. Percent of Technical Specification

% *...Limit C. Particulate

(> 8 day half-life)

1. Gross Activity Ci 1.29E-02 1.46E-03 2.03E-03 1.95E-03 3.50E+01 2. Average Release Rate uCi/sec 1.66E-03 1.86E-04 2.56E-04 2.45E-04 3. Percent of Technical Specification

% ....Limit D. Tritium 1. Total Release Activity Ci 1.07E+01 1.38E+01 1.06E+01 8.65E+00 1.50E+01 2. Average Release Rate uCi/sec 1.36E+00 1.75E+00 1.34E+00 1.09E+00 3. Percent of Technical Specification

% *Limit E. Gross Alpha 1. Total Release Activity Ci <1.OOE-11

<1.OOE-11

<1.OOE-11

<1.OOE-11 3.50E+01 2. Average Release Rate 3. Percent of Technical Specification Limit uCi/sec<LLD<LLD<LLD<LLD 4. 4 4"it'k F. Carbon-14 1. Total Release Activity Ci 2. Average Release Rate uCi/sec 3. Percent of Technical Specification

%Limit 4.59E+00 4.59E+00 4.60E+00 4.60E+00 5.84E-01 5.84E-01 5.79E-01 5.79E-01..... This information is contained in the Radiological Impact on Man section of the report."< Indicates activity of sample is less than LLD given in uCi/ml Page 5 of 94 LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2010)GASSEOUS EFFLENTS ELEVATED RELEASE UNIT I AND UNIT 2 Nuclides I Continuous Mode Batch Mode Released Unit uarter Quarter Quarter Quarter Quarter Quarter Quarter Quarter 1 2 3 4 1 2 3 4 1. Fission gases I : :. , ,. ,:: .Kr-85 Ci <1.OOE-04

<1.OOE-04

<1.OOE-04

<1.OOE-04 N/A N/A N/A N/A Kr-85m Ci 1.77E+02 1.14E+02 1.31 E+02 1.58E+02 N/A N/A N/A N/A Kr-87 Ci 3.35E+01 2.71 E+01 5.70E+00 2.53E+01 N/A N/A N/A N/A Kr-88 Ci 2.80E+02 1.51 E+02 1.76E+02 2.86E+02 N/A N/A N/A N/A Xe-133 Ci 1.10E+02 9.24E+01 7.50E+01 6.96E+01 N/A N/A N/A N/A Xe-135 Ci 5.90E-04 2.24E+00 4.25E-04 5.35E-04 N/A N/A N/A N/A Xe-135m Ci <1.OOE-04

<1.OOE-04

<1.OOE-04

<1.OOE-04 N/A N/A N/A N/A Xe-138 Ci <1.OOE-04

<1.OOE-04

<1.OOE-04

<1.OOE-04 N/A N/A N/A N/A Ar-41 Ci 5.67E-04 8.02E-04 4.75E-04 3.93E-04 N/A N/A N/A N/A Total for Period Ci 6.01 E+02 3.87E+02 3.88E+02 5.39E+02 N/A N/A N/A N/A 2. lodines ~---1-131 Ci 1.56E-02 3.78E-03 5.43E-03 6.33E-03 N/A N/A N/A N/A 1-132 Ci 1.72E-02 <1.OOE-11 1.66E-03 2.94E-03 N/A N/A N/A N/A 1-133 Ci 2.67E-02 9.39E-03 1.33E-02 1.72E-02 N/A N/A N/A N/A 1-134 Ci 1.56E-02 <1.O0E-11

<1.OOE-11 9.99E-03 N/A N/A N/A N/A 1-135 Ci 2.53E-02 <1.OE- 11 3.05E-03 1.08E-02 N/A N/A N/A N/A Total for Period Ci 1.OOE-01 1.32E-02 2.34E-02 4.73E-02 N/A N/A N/A N/A Tot 1-131,1- Ci 6.76E-02 1.32E-02 2.17E-02 3.43E-02 N/A N/A N/A N/A 3. Particulates...,-..

Sr-89 Ci 5.36E-04 2.48E-04 2.26E-04 2.06E-04 N/A N/A N/A N/A Sr-90 Ci 2.63E-05 <1.OOE-11

<1.OOE-11

<1.O0E-11 N/A N/A N/A N/A Cs-134 Ci <1.OE-11 <1.O0E-11

<1.O0E-11

<1.OE-11 N/A N/A N/A N/A Cs-137 Ci <1.OE-11 <1.OE-11 <1.OE-11 <1.OE-11 N/A N/A N/A N/A Ba-140 Ci 2.30E-03 5.79E-05 <1.OE-11 1.17E-04 N/A N/A N/A N/A La- 140 Ci 4.73E-03 1.08E-03 1.47E-03 1.53E-03 N/A N/A N/A N/A Cr-51 Ci <1.OE-11 <1.OE-11 <1.OE-11 <1.OOE-11 N/A N/A N/A N/A Mn-54 Ci 7.23E-05 <1.OE-11 <1.OE-11 <1.OE-11 N/A N/A N/A N/A Co-58 Ci 1.31 E-04 <1.OOE-11

<1.OE- 1l <1.OE-11 N/A N/A N/A N/A Co-60 Ci 7.35E-04 7.69E-05 3.09E-04 9.74E-05 N/A N/A N/A N/A Zn-65 Ci 2.45E-03 <1.OE-11 2.96E-05 <1.OE-11 N/A N/A N/A N/A Mo-99 Ci 1.92E-03 <1.OE-11 <1.OE-11 <1.OE-11 N/A N/A N/A N/A Ag-110m Ci <1.O0E-11

<1.OE-11 <1.OE-11 <1.OE-11 N/A N/A N/A N/A Ce-141 Ci <1.O0E-11

<1.OE-11 <1.OE-11 <1.OE-11 N/A N/A N/A N/A Ce- 144 Ci <1.OE-11 <1.00E-11

<1.OE-11 <1.OE-11 N/A N/A N/A N/A Total for Period Ci 1.29E-02 1.46E-03 2.03E-03 1.95E-03 N/A N/A N/A N/A 14. Tritium ~ ---NA NA NA-- NA H-3 Total for [ Ci 1.07E+01 1.38E+01 1.06E+01 I 8.65E+00 N/A N/A 5S.Gross Alphal _.F- ---~- --Gross Alpha I ciI <1.OOE-11 I <1.00E-11 I <1.00E-11 1 <1.00E-11 N/A N/A N/A N/A 6. Carbon-14 I C-14 Total for I Ci 4.59E+00 4.59E+OO 4.60E+00 4.60E+00 N/A N/A N/A N/A Page 6 of 94 LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2010)GASSEOUS EFFLENTS GROUND RELEASE UNIT 1 AND UNIT 2 Nuclides [ Continuous Mode Batch Mode Released I Unit Quarter Quarter Quarter Quarter Quarter Quarter Quarter Quarter_ _ _J1 2 3 4 1 2 3 4 1. Fission I Kr-85 Ci N/A N/A N/A N/A N/A <1.00E-04

<1.00E-04 N/A Kr-85m Ci N/A N/A N/A N/A N/A <1.OOE-04

<1.OOE-04 N/A Kr-87 Ci N/A N/A N/A N/A N/A <1.OOE-04

<1.OOE-04 N/A Kr-88 Ci N/A N/A N/A N/A N/A <1.OOE-04

<1.OOE-04 N/A Xe-133 Ci N/A N/A N/A N/A N/A <1.OOE-04

<1.OOE-04 N/A Xe-135 Ci N/A N/A N/A N/A N/A <1.OOE-04

<1.OOE-04 N/A Xe-135m Ci N/A N/A N/A N/A N/A <1.OOE-04

<1.OOE-04 N/A Xe-138 Ci N/A N/A N/A N/A N/A <1.OOE-04

<1.OOE-04 N/A Ar-41 Ci N/A N/A N/A N/A N/A <1.O0E-04

<1.OOE-04 N/A Total for Ci N/A N/A N/A N/A N/A <1.OOE-04

<1.OOE-04 N/A T-131 Ci N/A N/A N/A N/A N/A <1.OOE-11

<1.OOE-11 N/A 1-132 Ci N/A N/A N/A N/A N/A <1.OE-11 <1.OE-11 N/A 1-133 Ci N/A N/A N/A N/A N/A <1.O0E-11

<1.O0E-11 N/A 1-134 Ci N/A N/A N/A N/A N/A <1.0OE-11

<1.OOE-11 N/A 1-135 Ci N/A N/A N/A N/A N/A <1.OOE-11

<1.OOE-11 N/A Total for Ci N/A N/A N/A N/A N/A <1.OOE-11

<1.OOE-11 N/A Tot 1- 131,1- Ci N/A N/A N/A <1.OOE-11

<1.OOE-11 N/A 3. Particulates

[ -K'" Sr-89 Ci N/A N/A N/A N/A N/A <1.OE-11 <1.OOE-11 N/A Sr-90 Ci N/A N/A N/A N/A N/A <1.OE-11 <1.OE-11 N/A Cs-134 Ci N/A N/A N/A N/A N/A <1.OE-11 <1.OE-11 N/A Cs-137 Ci N/A N/A N/A N/A N/A <1.OE-11 4.62E-09 N/A Ba-140 Ci N/A N/A N/A N/A N/A <1.OE-11 <1.OE-11 N/A La-140 Ci N/A N/A N/A N/A N/A <1.OE-11 <1.OE-11 N/A Cr-51 Ci N/A N/A N/A N/A N/A <1.OE-11 <1.OE-11 N/A Mn-54 Ci N/A N/A N/A N/A N/A <1.OOE-11

<1.OE-11 N/A Co-58 Ci N/A N/A N/A N/A N/A <1.0OE-11

<1.OOE-11 N/A Co-60 Ci N/A N/A N/A N/A N/A <1.0OE-11 6.14E-08 N/A Zn-65 Ci N/A N/A N/A N/A N/A <1.00E-11

<1.O0E-11 N/A Mo-99 Ci N/A N/A N/A N/A N/A <1.OE-11 <1.O0E-11 N/A Ag-110m Ci N/A N/A N/A N/A N/A <1.OE-11 <1.O0E-11 N/A Ce-141 Ci N/A N/A N/A N/A N/A <1.OE-11 <1.O0E-11 N/A Ce-144 Ci N/A N/A N/A N/A N/A <1.OE-11 <1.00E-11 N/A Total for Ci N/A N/A N/A N/A N/A <1.00E-11 6.60E-08 N/A[4. Tritium H-3 Total for Ci N/A N/A N/A N/A N 2.37E-03 4.81 E-03 N/A[5. Gross __ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _GrossAlpha ItI N/A I N/A I N/A I N/A N/A I<1.OE-'i I <i.OE-1 I N/A C- 14 Total for CHi N/A I N/A N/A N/A N/A N/A N/A N/A Page 7 of 94 LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2010)LIQUID RELEASES UNIT 1 AND UNIT 2 SUMMATION OF ALL LIQUID RELEASES Estimated T 3rdQtr I 4th Qtr Total Error %I Units 1 1st Qtr I 2nd Qtr A. Fission and Activation Products 1. Total Activity Released Ci <LLD <LLD <LLD <LLD N/A 2. Average Concentration Released uCi/ml <LLD <LLD <LLD <LLD 3. Percent of Applicable Limit %*....B. Tritium 1. Total Activity Released Ci <LLD <LLD <LLD <LLD N/A 2. Average Concentration Released uCi/ml <LLD <LLD <LLD <LLD 3. Percent of Applicable Limit % ....C. Dissolved Noble Gases 1. Total Activity Released Ci <LLD <LLD <LLD <LLD N/A 2. Average Concentration Released uCi/ml <LLD <LLD <LLD <LLD 3. Percent of Applicable Limit % ....D. Gross Alpha 1. Total Activity Released (estimate)

Ci <LLD <LLD <LLD <LLD N/A 2. Average Concentration Released uCi/ml <LLD <LLD <LLD <LLD 3. Percent of Applicable Limit % .*..Discharge II I I I IF. Volume of Dilution Water I liters IO.OOE+00 O.0OE+00 O.OOE+00 O.OOE+00 N/A". This information is contained in the Radiological Impact on Man section of the report."<" Indicates activity of sample is less than LLD given in uCi/ml Page 8 of 94 LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2010)LIQUID RELEASES UNIT I AND UNIT 2 BATCH MODE lNuclides From Batch Releases Units 1 1st Qtr I 2nd Qtr I 3rd Qtr I 4th Qtr ]H-3 Ci <1.OOE-05

<1.OOE-05

<1.OOE-05

<1.OOE-05 Cr-51 Ci <5.OOE-07

<5.OOE-07

<5.OOE-07

<5.OOE-07 Mn-54 Ci <5.OOE-07

<5.OOE-07

<5.OOE-07

<5.OOE-07 Fe-55 Ci <1.OOE-06

<1.OOE-06

<1.OOE-06

<1.00E-06 Co-58 Ci <5.OOE-07

<5.OOE-07

<5.OOE-07

<5.OOE-07 Fe-59 Ci <5.0OE-07

<5.OOE-07

<5.OOE-07

<5.OOE-07 Co-60 Ci <5.OOE-07

<5.OOE-07

<5.OOE-07

<5.OOE-07 Zn-65 Ci <5.OOE-07

<5.OOE-07

<5.OOE-07

<5.OOE-07 Sr-89 Ci <5.OOE-08

<5.OOE-08

<5.OOE-08

<5.OOE-08 Sr-90 Ci <5.OOE-08

<5.OOE-08

<5.OOE-08

<5.OOE-08 Nb-95 Ci <5.OOE-07

<5.OOE-07

<5.O0E-07

<5.OOE-07 Zr-95 Ci <5.OOE-07

<5.OOE-07

<5.OOE-07

<5.OOE-07 Mo-99 Ci <5.OOE-07

<5.OOE-07

<5.OOE-07

<5.OOE-07 Tc-99m Ci <5.OOE-07

<5.OOE-07

<5.OOE-07

<5.00E-07 Ag-11im Ci <5.OOE-07

<5.OOE-07

<5.OOE-07

<5.OOE-07 Sb-122 Ci <5.OOE-07

<5.OOE-07

<5.OOE-07

<5.OOE-07 Sb-124 Ci <5.00E-07

<5.OOE-07

<5.OOE-07

<5.OOE-07 1-131 Ci <1.OOE-06

<1.OOE-06

<1.OOE-06

<1.OOE-06 Cs-134 Ci <5.OOE-07

<5.OOE-07

<5.OOE-07

<5.OOE-07 Cs-137 Ci <5.OOE-07

<5.OOE-07

<5.OOE-07

<5.OOE-07 Ba\La-140 Ci <5.00E-07

<5.OOE-07

<5.OOE-07

<5.OOE-07 Ce-141 Ci <5.OOE-07

<5.OOE-07

<5.OOE-07

<5.O0E-07 Ce-144 Ci <5.OOE-07

<5.OOE-07

<5.OOE-07

<5.OOE-07 W-187 Ci <5.00E-07

<5.OOE-07

<5.OOE-07

<5.OOE-07 TOTAL Ci <LLD <LLD <LLD <LLD Xe-131m Ci <1.OOE-05

<1.OOE-05

<1.OOE-05

<1.OOE-05 Xe-133 Ci <1.00E-05

<1.OOE-05

<1.OOE-05

<1.OOE-05 Xe-1 33m Ci <1.OOE-05

<1.OOE-05

<1.OOE-05

<1.00E-05 Xe-135 Ci <1.OOE-05

<1.OOE-05

<1.OOE-05

<1.OOE-05 Xe-135m Ci <1.OOE-05

<1.OOE-05

<1.OOE-05

<1.OOE-05 TOTAL Ci <LLD <LLD <LLD <LLD"<" Indicates activity of sample is less than uCi/ml LLD given in Page 9 of 94 LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2010)LIQUID RELEASES UNIT 1 AND UNIT 2 CONTINUOUS MODE lNuclides From Continuous Releases Units 1st Qtr I 2nd Qtr I 3rd Qtr I 4th Qtr Gross Alpha Ci <1.OOE-07

<1.OOE-07

<1.OOE-07

<1.OOE-07 H-3 Ci <1.OOE-05

<1.OOE-05

<1.OOE-05

<1.00E-05 Cr-51 Ci <5.OOE-07

<5.OOE-07

<5.OOE-07

<5.OOE-07 Mn-54 Ci <5.OOE-07

<5.OOE-07

<5.OOE-07

<5.OOE-07 Fe-55 (Estimate)

Ci <11.00E-06

<11.00E-06

<11.00E-06

<1.00E-06 Co-58 Ci <5.OOE-07

<5.OOE-07

<5.OOE-07

<5.OOE-07 Fe-59 Ci <5.OOE-07

<5.OOE-07

<5.OOE-07

<5.OOE-07 Co-60 Ci <5.OOE-07

<5.OOE-07

<5.OOE-07

<5.OOE-07 Zn-65 Ci <5.OOE-07

<5.OOE-07

<5.OOE-07

<5.OOE-07 Sr-89 (Estimate)

Ci <5.OOE-08

<5.OOE-08

<5.OOE-08

<5.OOE-08 Sr-90 (Estimate)

Ci <5.OOE-08

<5.OOE-08

<5.OOE-08

<5.O0E-08 Nb-95 Ci <5.OOE-07

<5.OOE-07

<5.OOE-07

<5.OOE-07 Zr-95 Ci <5.OOE-07

<5.OOE-07

<5.OOE-07

<5.OOE-07 Mo-99 Ci <5.OOE-07

<5.OOE-07

<5.OOE-07

<5.OOE-07 Tc-99m Ci <5.OOE-07

<5.00E-07

<5.OOE-07

<5.OOE-07 Ag-110m Ci <5.OOE-07

<5.OOE-07

<5.OOE-07

<5.OOE-07 Sb-122 Ci <5.OOE-07

<5.OOE-07

<5.OOE-07

<5.00E-07 Sb-1 24 Ci <5.OOE-07

<5.OOE-07

<5.OOE-07

<5.OOE-07 1-131 Ci <11.00E-06

<11.00E-06

<1.OOE-06

<11.00E-06 Cs-134 Ci <5.OOE-07

<5.OOE-07

<5.OOE-07

<5.OOE-07 Cs-1 37 Ci <5.O0E-07

<5.OOE-07

<5.OOE-07

<5.OOE-07 Ba\La-140 Ci <5.OOE-07

<5.OOE-07

<5.OOE-07

<5.OOE-07 Ce-141 Ci <5.OOE-07

<5.OOE-07

<5.OOE-07

<5.OOE-07 Ce-144 Ci <5.OOE-07

<5.OOE-07

<5.OOE-07

<5.OOE-07 W-187 Ci <5.OOE-07

<5.OOE-07

<5.OOE-07

<5.00E-07 TOTAL Ci <LLD <LLD <LLD <LLD Xe-131m Ci <1.OOE-05

<1.OOE-05

<1.OOE-05

<1.OOE-05 Xe-133 Ci <1.OOE-05

<1.O0E-05

<1.OOE-05

<1.OOE-05 Xe-1 33m Ci <1.00E-05

<1.OOE-05

<1.OOE-05

<1.OOE-05 Xe-135 Ci <1.OOE-05

<1.OOE-05

<1.00E-05

<1.OOE-05 Xe-1 35m Ci <1.00E-05

<1.00E-05

<1.OOE-05

<1.OOE-05 TOTAL Ci <LLD <LLD <LLD <LLD"<" Indicates activity of sample is less than LLD given in uCi/ml Page 10 of 94 LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2010)SOLID WASTE AND IRRADIATED FUEL SHIPMENTS FIRST QUARTER A. Solid Waste Shipped Offsite for Burial or Disposal (Not irradiated fuel)1. Types of Waste Total Quantity Total Est. Total Types of Waste (M) Activity (Ci) Period Error (%)a. Spent resins, filter sludges, evaporator bottoms, 1.52E+01 3.57E+01 1Q10 +/-25%etc b. Dry compressible waste, contaminated equip, etc 9.68E+02 7.14E-01 1Q10 +/-25%c. Irradiated components, control rods, etc None None 1Q10 N/A d. Other None None 1Q10 N/A 2. Estimate of major nuclide composition (by waste type)Percent Shipment Abundance Type(s)Major Nuclide Composition

(>1%)a. Spent resins, filter sludges, evaporator bottoms, etc Mn-54 1.668% LSA Fe-55 53.445%Co-60 42.217%Zn-65 1.140%b. Dry compressible waste, contaminated equip, etc H-3 1.402% LSA Mn-54 3.500%Fe-55 50.244%Co-60 39.638%Zn-65 2.475%Cs-137 1.536%c. Irradiated components, control rods, etc None N/A d. Other (describe)

None N/A Page 11 of 94 LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2010)SOLID WASTE AND IRRADIATED FUEL SHIPMENTS FIRST QUARTER 3. Solid Waste Disposition Number of Shipments Mode of Transportation Destination 1 Hittman Transport Clive Disposal Facility (Bulk)1 Hittman Transport Clive Disposal Facility (Containerized) 17 Hittman Transport Energy Solutions

-Bear Creek B. Irradiated Fuel Shipments (disposition)

Number of Shipments Mode of Transportation Destination None N/A N/A C. Changes to the Process Control Program There were no changes to the Process Control Program during this period.Page 12 of 94 LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2010)SOLID WASTE AND IRRADIATED FUEL SHIPMENTS SECOND QUARTER A. Solid Waste Shipped Offsite for Burial or Disposal (Not irradiated fuel)1. Types of Waste Total Quantity Total Est. Total Types of Waste (M) Activity (Ci) Period Error (%)a. Spent resins, filter sludges, evaporator bottoms, 3.41 E+01 4.97E+00 2Q10 +/-25%etc b. Dry compressible waste, contaminated equip, etc 7.41 E+01 3.82E-01 2Q10 +/-25%c. Irradiated components, control rods, etc None None 2Q10 N/A d. Other (2 Oil/Water) 1.09E+01 1.25E-02 2Q10 +/-25%2. Estimate of major nuclide composition (by waste type)Percent Shipment Abundance Type(s)Major Nuclide Composition

(>1%)a. Spent resins, filter sludges, evaporator bottoms, etc Mn-54 1.325% LSA Fe-55 44.374%Co-60 47.614%Zn-65 2.330%Cs-137 2.022%b. Dry compressible waste, contaminated equip, etc Mn-54 3.398% LSA Fe-55 50.885%Co-60 40.529%Zn-65 2.362%Cs-137 1.584%c. Irradiated components, control rods, etc None N/A d. Other (Water and Oil)H-3 52.239% LSA Mn-54 1.708%Fe-55 24.344%Co-60 19.172%Zn-65 1.212%Page 13 of 94 LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2010)SOLID WASTE AND IRRADIATED FUEL SHIPMENTS SECOND QUARTER 3. Solid Waste Disposition Number of Shipments Mode of Transportation Destination 3 Hittman Transport Clive Disposal Facility (Bulk)1 Hittman Transport Clive Disposal Facility (Containerized) 4 Hittman Transport Energy Solutions

-Bear Creek B. Irradiated Fuel Shipments (disposition)

Number of Shipments Mode of Transportation Destination None N/A N/A C. Changes to the Process Control Program There were no changes to the Process Control Program during this period.Page 14 of 94 LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2010)SOLID WASTE AND IRRADIATED FUEL SHIPMENTS THIRD QUARTER A. Solid Waste Shipped Offsite for Burial or Disposal (Not irradiated fuel)1. Types of Waste Total Quantity Total Est. Total Types of Waste (MA) Activity (Ci) Period Error (%)a. Spent resins, filter sludges, evaporator bottoms, 7.35E+01 1.79E+01 3Q10 +/-25%etc b. Dry compressible waste, contaminated equip, etc 1.88E+02 8.43E-02 3Q10 +/-25%c. Irradiated components, control rods, etc None None 3Q10 N/A d. Other (describe)

None None 3Q10 N/A 2. Estimate of major nuclide composition (by waste type)Percent Shipment Abundance Type(s)Major Nuclide Composition

(>1%)a. Spent resins, filter sludges, evaporator bottoms, etc Mn-54 2.552% LSA Fe-55 50.770%Co-60 41.600%Zn-65 2.234%Cs-137 1.514%b. Dry compressible waste, contaminated equip, etc Mn-54 3.369% LSA Fe-55 50.796%Co-60 40.524%Zn-65 2.336%Cs-137 1.586%c. Irradiated components, control rods, etc None N/A d. Other (describe)

None N/A Page 15 of 94 LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2010)SOLID WASTE AND IRRADIATED FUEL SHIPMENTS THIRD QUARTER 3. Solid Waste Disposition Number of Shipments Mode of Transportation Destination 7 Hittman Transport Clive Disposal Facility (Bulk)7 Hittman Transport Energy Solutions

-Bear Creek B. Irradiated Fuel Shipments (disposition)

Number of Shipments Mode of Transportation Destination None N/A N/A C. Changes to the Process Control Program There were no changes to the Process Control Program during this period.Page 16 of 94 LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2010)SOLID WASTE AND IRRADIATED FUEL SHIPMENTS FOURTH QUARTER A. Solid Waste Shipped Offsite for Burial or Disposal (Not irradiated fuel)1. Types of Waste Total Quantity Total Est. Total Types of Waste (M) Activity (Ci) Period Error %a. Spent resins, filter sludges, evaporator bottoms, 1.81 E+01 6.66E+00 4Q10 +/-25%etc b. Dry compressible waste, contaminated equip, etc 1.30E+02 1.07E-01 4Q10 +/-25%c. Irradiated components, control rods, etc None None 4Q10 N/A d. Other (Water and Oil) 8.89E+00 1.23E-02 4Q10 +/-25%2. Estimate of major nuclide composition (by waste type)Percent Shipment Abundance Type(s)Major Nuclide Composition

(>1%)a. Spent resins, filter sludges, evaporator bottoms, etc Mn-54 3.299% LSA Fe-55 50.909%Co-60 40.324%Zn-65 2.658%Cs-137 1.474%b. Dry compressible waste, contaminated equip, etc Mn-54 3.565% LSA Fe-55 50.931%Co-60 40.134%Zn-65 2.526%Cs-137 1.554%c. Irradiated components, control rods, etc None[ N/A d. Other (Water and Oil)H-3 52.277% LSA Mn-54 1.699%Fe-55 24.321%Co-60 19.174%Zn-65 1.203% _Page 17 of 94 LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2010)SOLID WASTE AND IRRADIATED FUEL SHIPMENTS FOURTH QUARTER 3. Solid Waste Disposition Number of Shipments Mode of Transportation Destination 2 Hittman Transport Clive Disposal Facility (Bulk)5 Hittman Transport Energy Solutions

-Bear Creek B. Irradiated Fuel Shipments (disposition)

Number of Shipments Mode of Transportation Destination None N/A N/A C. Changes to the Process Control Program There were no changes to the Process Control Program during this period.Page 18 of 94 LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2010)RADIOLOGICAL IMPACT ON MAN MAXIMUM DOSES RESULTING FROM RELEASES AND COMPLIANCE STATUS AIRBORNE Effluents-10CFR50 Listing 21-mar-2011 10:01:28 STATION: UNIT: PERIOD: NAME: REPORT: MODE: LASALLE STATION 1 01/01/10 12/31/10 ODCMLAS ANNUAL ACTUAL The LaSalle County Nuclear Power Station maximum expected annual dose from Carbon-14 has been calculated using the maximum gross thermal capacity at full power operation.

The resultant bounding doses are based upon site specific assumptions of source term.Page 19 of 94 LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2010)RADIOLOGICAL IMPACT ON MAN MAXIMUM DOSES RESULTING FROM RELEASES AND COMPLIANCE STATUS LASALLE STATION UNIT ONE ACTUAL 2010 MAXIMUM DOSES RESULTING FROM AIRBORNE RELEASES PERIOD OF RELEASE -01/01/10 TO 12/31/10 CALCULATED 03/21/11 INFANT RECEPTOR 1ST 2ND 3RD 4TH TYPE QUARTER QUARTER QUARTER QUARTER ANNUAL JAN-MAR APR-JUN JUL-SEP OCT-DEC GAMMA AIR 1.26E-02 7.01E-03 7.75E-03 1.27E-02 4.01E-02 (MRAD) (WSW ) (WSW ) (WSW ) (WSW ) (WSW)BETA AIR 3.97E-04 2.55E-04 2.24E-04 3.62E-04 1.24E-03 (MRAD) (ESE ) (ESE ) (ESE ) (ESE ) (ESE)TOT. BODY 9.56E-03 5.30E-03 5.86E-03 9.63E-03 3.03E-02 (MREM) (WSW ) (WSW ) (WSW ) (WSW ) (WSW)SKIN 1.01E-02 5.59E-03 6.15E-03 1.01E-02 3.19E-02 (MREM) (WSW ) (WSW ) (WSW ) (WSW ) (WSW)ORGAN 3.85E-02 3.79E-02 3.81E-02 3.79E-02 1.52E-01 (MREM) (ESE) (ESE) (ESE) (ESE) (ESE BONE BONE BONE BONE BONE THIS IS A REPORT FOR THE CALENDAR YEAR 2010 COMPLIANCE STATUS -10CFR 50 APP. I INFANT RECEPTOR-------------

% OF APP I.-------------

QTRLY 1ST QTR 2ND QTR 3RD QTR 4TH QTR YRLY % OF OBJ JAN-MAR APR-JUN JUL-SEP OCT-DEC OBJ APP. I GAMMA AIR (MRAD) 5.0 0.25 0.14 0.16 0.25 10.0 0.40 BETA AIR (MRAD) 10.0 0.00 0.00 0.00 0.00 20.0 0.01 TOT. BODY (MREM) 2.5 0.38 0.21 0.23 0.39 5.0 0.61 SKIN (MREM) 7.5 0.13 0.07 0.08 0.13 15.0 0.21 ORGAN (MREM) 7.5 0.51 0.51 0.51 0.51 15.0 1.02 BONE BONE BONE BONE BONE Page 20 of 94 LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2010)RADIOLOGICAL IMPACT ON MAN MAXIMUM DOSES RESULTING FROM RELEASES AND COMPLIANCE STATUS LASALLE STATION UNIT ONE ACTUAL 2010 MAXIMUM DOSES RESULTING FROM AIRBORNE RELEASES PERIOD OF RELEASE -01/01/10 TO 12/31/10 CALCULATED 03/21/11 CHILD RECEPTOR IST 2ND 3RD 4TH TYPE QUARTER QUARTER QUARTER QUARTER ANNUAL JAN-MAR APR-JUN JUL-SEP OCT-DEC GAMMA AIR 1.26E-02 7.01E-03 7.75E-03 1.27E-02 4.01E-02 (MRAD) (WSW ) (WSW ) (WSW ) (WSW ) (WSW)BETA AIR 3.97E-04 2.55E-04 2.24E-04 3.62E-04 1.24E-03 (MRAD) (ESE ) (ESE ) (ESE ) (ESE ) (ESE)TOT. BODY 9.56E-03 5.30E-03 5.86E-03 9.63E-03 3.03E-02 (MREM) (WSW ) (WSW ) (WSW ) (WSW ) (WSW)SKIN 1.01E-02 5.59E-03 6.15E-03 1.01E-02 3.19E-02 (MREM) (WSW ) (WSW ) (WSW ) (WSW ) (WSW)ORGAN 3.42E-02 1.13E-01 1.53E-01 7.34E-02 3.74E-01 (MREM) (NNE) (NNE) (NNE) (NNE) (NNE BONE BONE BONE BONE BONE THIS IS A REPORT FOR THE CALENDAR YEAR 2010 COMPLIANCE STATUS -10CFR 50 APP. I CHILD RECEPTOR-------------

% OF APP I.-------------

QTRLY 1ST QTR 2ND QTR 3RD QTR 4TH QTR YRLY % OF OBJ JAN-MAR APR-JUN JUL-SEP OCT-DEC OBJ APP. I GAMMA AIR (MRAD) 5.0 0.25 0.14 0.16 0.25 10.0 0.40 BETA AIR (MRAD) 10.0 0.00 0.00 0.00 0.00 20.0 0.01 TOT. BODY (MREM) 2.5 0.38 0.21 0.23 0.39 5.0 0.61 SKIN (MREM) 7.5 0.13 0.07 0.08 0.13 15.0 0.21 ORGAN (MREM) 7.5 0.46 1.51 2.04 0.98 15.0 2.49 BONE BONE BONE BONE BONE Page 21 of 94 LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2010)RADIOLOGICAL IMPACT ON MAN MAXIMUM DOSES RESULTING FROM RELEASES AND COMPLIANCE STATUS LASALLE STATION UNIT ONE ACTUAL 2010 MAXIMUM DOSES RESULTING FROM AIRBORNE RELEASES PERIOD OF RELEASE -01/01/10 TO 12/31/10 CALCULATED 03/21/11 TEENAGER RECEPTOR 1ST 2ND 3RD 4TH TYPE QUARTER QUARTER QUARTER QUARTER ANNUAL JAN-MAR APR-JUN JUL-SEP OCT-DEC GAMMA AIR 1.26E-02 7.01E-03 7.75E-03 1.27E-02 4.01E-02 (MRAD) (WSW ) (WSW ) (WSW ) (WSW ) (WSW)BETA AIR 3.97E-04 2.55E-04 2.24E-04 3.62E-04 1.24E-03 (MRAD) (ESE ) (ESE ) (ESE ) (ESE ) (ESE)TOT. BODY 9.56E-03 5.30E-03 5.86E-03 9.63E-03 3.03E-02 (MREM) (WSW ) (WSW ) (WSW ) (WSW ) (WSW)SKIN 1.01E-02 5.59E-03 6.15E-03 1.01E-02 3.19E-02 (MREM) (WSW ) (WSW ) (WSW ) (WSW ) (WSW)ORGAN 1.66E-02 4.90E-02 6.56E-02 3.25E-02 1.64E-01 (MREM) (NNE) (NNE) (NNE) (NNE) (NNE BONE BONE BONE BONE BONE THIS IS A REPORT FOR THE CALENDAR YEAR 2010 COMPLIANCE STATUS -10CFR 50 APP. I TEENAGER RECEPTOR-------------

% OF APP I.--------------

QTRLY 1ST QTR 2ND QTR 3RD QTR 4TH QTR YRLY % OF OBJ JAN-MAR APR-JUN JUL-SEP OCT-DEC OBJ APP. I GAMMA AIR (MRAD) 5.0 0.25 0.14 0.16 0.25 10.0 0.40 BETA AIR (MRAD) 10.0 0.00 0.00 0.00 0.00 20.0 0.01 TOT. BODY (MREM) 2.5 0.38 0.21 0.23 0.39 5.0 0.61 SKIN (MREM) 7.5 0.13 0.07 0.08 0.13 15.0 0.21 ORGAN (MREM) 7.5 0.22 0.65 0.88 0.43 15.0 1.09 BONE BONE BONE BONE BONE Page 22 of 94 LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2010)RADIOLOGICAL IMPACT ON MAN MAXIMUM DOSES RESULTING FROM RELEASES AND COMPLIANCE STATUS LASALLE STATION UNIT ONE ACTUAL 2010 MAXIMUM DOSES RESULTING FROM AIRBORNE RELEASES PERIOD OF RELEASE -01/01/10 TO 12/31/10 CALCULATED 03/21/11 ADULT RECEPTOR 1ST 2ND 3RD 4TH TYPE QUARTER QUARTER QUARTER QUARTER ANNUAL JAN-MAR APR-JUN JUL-SEP OCT-DEC GAMMA AIR 1.26E-02 7.01E-03 7.75E-03 1.27E-02 4.01E-02 (MRAD) (WSW ) (WSW ) (WSW ) (WSW ) (WSW)BETA AIR 3.97E-04 2.55E-04 2.24E-04 3.62E-04 1.24E-03 (MRAD) (ESE ) (ESE ) (ESE ) (ESE ) (ESE)TOT. BODY 9.56E-03 5.30E-03 5.86E-03 9.63E-03 3.03E-02 (MREM) (WSW ) (WSW ) (WSW ) (WSW ) (WSW)SKIN 1.01E-02 5.59E-03 6.15E-03 1.01E-02 3.19E-02 (MREM) (WSW ) (WSW ) (WSW ) (WSW ) (WSW)ORGAN 1.55E-02 3.53E-02 4.56E-02 2.51E-02 1.21E-01 (MREM) (NNE) (NNE) (NNE) (NNE) (NNE BONE BONE BONE BONE BONE THIS IS A REPORT FOR THE CALENDAR YEAR 2010 COMPLIANCE STATUS -10CFR 50 APP. I ADULT RECEPTOR-------------

% OF APP I.-------------

QTRLY 1ST QTR 2ND QTR 3RD QTR 4TH QTR YRLY % OF OBJ JAN-MAR APR-JUN JUL-SEP OCT-DEC OBJ APP. I GAMMA AIR (MRAD) 5.0 0.25 0.14 0.16 0.25 10.0 0.40 BETA AIR (MRAD) 10.0 0.00 0.00 0.00 0.00 20.0 0.01 TOT. BODY (MREM) 2.5 0.38 0.21 0.23 0.39 5.0 0.61 SKIN (MREM) 7.5 0.13 0.07 0.08 0.13 15.0 0.21 ORGAN (MREM) 7.5 0.21 0.47 0.61 0.33 15.0 0.81 BONE BONE BONE BONE BONE Page 23 of 94 LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2010)RADIOLOGICAL IMPACT ON MAN MAXIMUM DOSES RESULTING FROM RELEASES AND COMPLIANCE STATUS AQUATIC Effluents-10CFR50 Listing 21-mar-2011 10:16:16 STATION: LASALLE STATION UNIT: 1 PERIOD: 01/01/10 12/31/10 NAME: ODCMLAS REPORT: ANNUAL MODE: ACTUAL Page 24 of 94 LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2010)RADIOLOGICAL IMPACT ON MAN MAXIMUM DOSES RESULTING FROM RELEASES AND COMPLIANCE STATUS LASALLE STATION UNIT ONE ACTUAL 2010 MAXIMUM DOSES (MREM) RESULTING FROM AQUATIC EFFLUENTS PERIOD OF RELEASE -01/01/10 TO 12/31/10 CALCULATED 03/21/11 INFANT RECEPTOR DOSE TYPE TOTAL BODY INTERNAL ORGAN IST QUARTER JAN-MAR 2ND QUARTER APR-JUN 3RD QUARTER JUL-SEP 4TH QUARTER OCT-DEC ANNUAL 0.00E+00 0.00E+00 0.OOE+00 0.00E+00 0.00E+00 0.OOE+00 0.OOE+00 0.OOE+00 0.00E+00 0.OOE+00 THIS IS A REPORT FOR THE CALENDAR YEAR 2010 COMPLIANCE STATUS -10 CFR 50 APP. I-------------

% OF APP I.--------------

QTRLY 1ST QTR 2ND QTR 3RD QTR 4TH QTR YRLY % OF OBJ JAN-MAR APR-JUN JUL-SEP OCT-DEC OBJ APP. I TOTAL BODY (MREM) 1.5 CRIT. ORGAN(MREM) 5.0 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 3.0 0.00 10.0 0.00 Page 25 of 94 LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2010)RADIOLOGICAL IMPACT. ON MAN MAXIMUM DOSES RESULTING FROM RELEASES AND COMPLIANCE STATUS LASALLE STATION UNIT ONE 2010 ANNUAL REPORT PROJECTED DOSE AT NEAREST COMMUNITY WATER SYSTEM *PERIOD OF RELEASE -01/01/10 TO 12/31/10 CALCULATED 03/21/11 INFANT RECEPTOR DOSE TYPE TOTAL BODY INTERNAL ORGAN 1ST QUARTER JAN-MAR 2ND QUARTER APR-JUN 3RD QUARTER JUL-SEP 4TH QUARTER OCT-DEC ANNUAL 0.OOE+00 0.OOE+00 0.OOE+00 0.OOE+00 0.OOE+00 0.OOE+00 0.00E+00 0.OOE+00 0.OOE+00 0.OOE+00 THIS IS A REPORT FOR THE CALENDAR YEAR 2010 COMPLIANCE STATUS -40 CFR 141 TYPE TOTAL BODY INTERNAL ORGAN ANNUAL LIMIT 4.0 MREM 4.0 MREM% OF LIMIT 0.000 0.000 Page 26 of 94 LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2010)RADIOLOGICAL IMPACT ON MAN MAXIMUM DOSES RESULTING FROM RELEASES AND COMPLIANCE STATUS LASALLE STATION UNIT ONE ACTUAL 2010 MAXIMUM DOSES (MREM) RESULTING FROM AQUATIC EFFLUENTS PERIOD OF RELEASE -01/01/10 TO 12/31/10 CALCULATED 03/21/11 CHILD RECEPTOR DOSE TYPE TOTAL BODY INTERNAL ORGAN IST QUARTER JAN-MAR 2ND QUARTER APR-JUN 3RD QUARTER JUL-SEP 4TH QUARTER OCT-DEC ANNUAL 0.OOE+00 0.OOE+00 0.OOE+00 0.OOE+00 0.OOE+00 0.OOE+00 0.OOE+00 0.OOE+00 0.OOE+00 0.OOE+00 THIS IS A REPORT FOR THE CALENDAR YEAR 2010 COMPLIANCE STATUS -10 CFR 50 APP. I-------------

% OF APP I.--------------

QTRLY 1ST QTR 2ND QTR 3RD QTR 4TH QTR YRLY % OF OBJ JAN-MAR APR-JUN JUL-SEP OCT-DEC OBJ APP. I TOTAL BODY (MREM) 1.5 CRIT. ORGAN(MREM) 5.0 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 3.0 0.00 10.0 0.00 Page 27 of 94 LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2010)RADIOLOGICAL IMPACT ON MAN MAXIMUM DOSES RESULTING FROM RELEASES AND COMPLIANCE STATUS LASALLE STATION UNIT ONE 2010 ANNUAL REPORT PROJECTED DOSE AT NEAREST COMMUNITY WATER SYSTEM *PERIOD OF RELEASE -01/01/10 TO 12/31/10 CALCULATED 03/21/11 DOSE TYPE TOTAL BODY INTERNAL ORGAN 1ST QUARTER JAN-MAR CHILD RECEPTOR 2ND 3RD QUARTER QUARTER APR-JUN JUL-SEP 4TH QUARTER OCT-DEC ANNUAL 0.00E+00 0.00E+00 0.00E+00 0.OOE+00 0.OOE+00 0.00E+00 0.OOE+00 0.OOE+00 0.OOE+00 0.OOE+00 THIS IS A REPORT FOR THE CALENDAR YEAR 2010 COMPLIANCE STATUS -40 CFR 141 TYPE TOTAL BODY INTERNAL ORGAN ANNUAL LIMIT 4.0 MREM 4.0 MREM% OF LIMIT 0.000 0.000 Page 28 of 94 LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2010)RADIOLOGICAL IMPACT ON MAN MAXIMUM DOSES RESULTING FROM RELEASES AND COMPLIANCE STATUS LASALLE STATION UNIT ONE ACTUAL 2010 MAXIMUM DOSES (MREM) RESULTING FROM AQUATIC EFFLUENTS PERIOD OF RELEASE -01/01/10 TO 12/31/10 CALCULATED 03/21/11 TEENAGER RECEPTOR DOSE TYPE TOTAL BODY INTERNAL ORGAN 1ST QUARTER JAN-MAR 2ND QUARTER APR-JUN 3RD QUARTER JUL-SEP 4TH QUARTER OCT-DEC ANNUAL 0.00E+00 0.OOE+00 0.OOE+00 0.OOE+00 0.OOE+00 0.OOE+00 0.OOE+00 0.OOE+00 0.OOE+00 0.OOE+00 THIS IS A REPORT FOR THE CALENDAR YEAR 2010 COMPLIANCE STATUS -10 CFR 50 APP. I-------------

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QTRLY 1ST QTR 2ND QTR 3RD QTR 4TH QTR YRLY % OF OBJ JAN-MAR APR-JUN JUL-SEP OCT-DEC OBJ APP. I TOTAL BODY (MREM) 1.5 CRIT. ORGAN(MREM) 5.0 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 3.0 0.00 10.0 0.00 Page 29 of 94 LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2010)RADIOLOGICAL IMPACT ON MAN MAXIMUM DOSES RESULTING FROM RELEASES AND COMPLIANCE STATUS LASALLE STATION UNIT ONE 2010 ANNUAL REPORT PROJECTED DOSE AT NEAREST COMMUNITY WATER SYSTEM *PERIOD OF RELEASE -01/01/10 TO 12/31/10 CALCULATED 03/21/11 TEENAGER RECEPTOR DOSE TYPE TOTAL BODY INTERNAL ORGAN IST QUARTER JAN-MAR 2ND QUARTER APR-JUN 3RD QUARTER JUL-SEP 4TH QUARTER OCT-DEC ANNUAL 0.OOE+00 0.OOE+00 0.OOE+00 0.OOE+00 0.OOE+00 0.OOE+00 0.OOE+00 0.OOE+00 0.OOE+00 0.OOE+00 THIS IS A REPORT FOR THE CALENDAR YEAR 2010 COMPLIANCE STATUS -40 CFR 141 TYPE TOTAL BODY INTERNAL ORGAN ANNUAL LIMIT 4.0 MREM 4.0 MREM% OF LIMIT 0.000 0.000 Page 30 of 94 LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2010)RADIOLOGICAL IMPACT ON MAN MAXIMUM DOSES RESULTING FROM RELEASES AND COMPLIANCE STATUS LASALLE STATION UNIT ONE MAXIMUM DOSES PERIOD OF RELEASE -ACTUAL 2010 (MREM) RESULTING FROM AQUATIC EFFLUENTS 01/01/10 TO 12/31/10 CALCULATED 03/21/11 ADULT RECEPTOR DOSE TYPE TOTAL BODY INTERNAL ORGAN 1ST QUARTER JAN-MAR 2ND QUARTER APR-JUN 3RD QUARTER JUL-SEP 4TH QUARTER OCT-DEC ANNUAL 0.OOE+00 0.OOE+00 0.OOE+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.OOE+00 0.00E+00 THIS IS A REPORT FOR THE CALENDAR YEAR 2010 COMPLIANCE STATUS -10 CFR 50 APP. I-------------

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QTRLY 1ST QTR 2ND QTR 3RD QTR 4TH QTR YRLY % OF OBJ JAN-MAR APR-JUN JUL-SEP OCT-DEC OBJ APP. I TOTAL BODY (MREM) 1.5 CRIT. ORGAN(MREM) 5.0 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 3.0 0.00 10.0 0.00 Page 31 of 94 LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2010)RADIOLOGICAL IMPACT ON MAN MAXIMUM DOSES RESULTING FROM RELEASES AND COMPLIANCE STATUS LASALLE STATION UNIT ONE 2010 ANNUAL REPORT PROJECTED DOSE AT NEAREST COMMUNITY WATER SYSTEM *PERIOD OF RELEASE -01/01/10 TO 12/31/10 CALCULATED 03/21/11 ADULT RECEPTOR DOSE TYPE TOTAL BODY INTERNAL ORGAN 1ST QUARTER JAN-MAR 2ND QUARTER APR-JUN 3RD QUARTER JUL-SEP 4TH QUARTER OCT-DEC ANNUAL 0.OOE+00 0.OOE+00 0.OOE+00 0.OOE+00 0.OOE+00 0.OOE+00 0.OOE+00 0.OOE+00 0.OOE+00 0.OOE+00 THIS IS A REPORT FOR THE CALENDAR YEAR 2010 COMPLIANCE STATUS -40 CFR 141 TYPE TOTAL BODY INTERNAL ORGAN ANNUAL LIMIT 4.0 MREM 4.0 MREM% OF LIMIT 0.000 0.000 Page 32 of 94 LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2010)RADIOLOGICAL IMPACT ON MAN MAXIMUM DOSES RESULTING FROM RELEASES AND COMPLIANCE STATUS 21-mar-2011 10:18:01 Total Effective Dose Equivalent

-10CFR20 Listing STATION: LASALLE STATION UNIT: 1 PERIOD: 01/01/10 12/31/10 NAME: ODCMLAS REPORT: ANNUAL MODE: ACTUAL For ADULT dose calculations, INHALATION MILK PRODUCE VEGETABLES MEAT GROUND DEPOSITION FISH WATER SKYSHINE WHOLE BODY the included pathways are: Airborne Effluents are complete from 01/01/10 to 12/31/10 Aquatic Effluents are complete from 01/01/10 to 12/31/10 Skyshine entries are complete from 01/01/10 to 12/31/10 Page 33 of 94 LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2010)RADIOLOGICAL IMPACT ON MAN MAXIMUM DOSES RESULTING FROM RELEASES AND COMPLIANCE STATUS LASALLE STATION UNIT ONE 10 CFR 20 COMPLIANCE ASSESSMENT PERIOD OF ASSESSMENT 01/01/10 TO 12/31/10 CALCULATED 03/21/11 1. 10 CFR 20.1301 (a) (1) Compliance Total Effective Dose Eqivalent, mrem/yr 4.83E-01 10 CFR 20.1301 (a) (1) limit mrem/yr 100.0% of limit 0.48 Compliance Summary -10CFR20 1st Qtr 2nd Qtr 3rd Qtr 4th Qtr% of Limit TEDE 8.91E-02 1.29E-01 1.37E-01 1.28E-01 0.48 Page 34 of 94 LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2010)RADIOLOGICAL IMPACT ON MAN MAXIMUM DOSES RESULTING FROM RELEASES AND COMPLIANCE STATUS LASALLE STATION UNIT ONE 10 CFR 20 COMPLIANCE ASSESSMENT PERIOD OF ASSESSMENT 01/01/10 TO 12/31/10 CALCULATED 03/21/11 2. 10 CFR 20.1301 (d)/40 CFR 190 Compliance Whole Body (DDE)Organ Dose (CDE)Plume Skyshi ISFSI Ground Thyroi Gonads Breast Lung Marrow Bone Remain CEDE TEDE Dose (mrem)3. 03E-02 ne 3.26E-01 2 .94E-02 9.83E-04 Total 3.86E-01[d 1.10E-01 9.63E-02 9.62E-02 9.62E-02 9.63E-02 9.63E-02 tder 9.63E-02 9.67E-02 4.83E-01 25.0 75.0 25.0 25.0 25.0 25.0 25.0 25.0 1.54 0.15 0.39 0.38 0.38 0.39 0.39 0.39 Limit % of (mrem) Limit 100.0 0.48 Page 35 of 94 LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2010)RADIOLOGICAL IMPACT ON MAN MAXIMUM DOSES RESULTING FROM RELEASES AND COMPLIANCE STATUS 21-mar-2011 10:19:26 Total Effective Dose Equivalent

-10CFR20 Listing STATION: LASALLE STATION UNIT: 2 PERIOD: 01/01/10 12/31/10 NAME: ODCMLAS REPORT: ANNUAL MODE: ACTUAL For ADULT dose calculations, INHALATION MILK PRODUCE VEGETABLES MEAT GROUND DEPOSITION FISH WATER SKYSHINE WHOLE BODY the included pathways are: Airborne Effluents are complete from to Aquatic Effluents are complete from to Skyshine entries are complete from 01/01/10 to 12/31/10 Page 36 of 94 LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2010)RADIOLOGICAL IMPACT ON MAN MAXIMUM DOSES RESULTING FROM RELEASES AND COMPLIANCE STATUS LASALLE STATION UNIT TWO 10 CFR 20 COMPLIANCE ASSESSMENT PERIOD OF ASSESSMENT 01/01/10 TO 12/31/10 CALCULATED 03/21/11 1. 10 CFR 20.1301 (a)(1) Compliance Total Effective Dose Eqivalent, mrem/yr 3.81E-01 10 CFR 20.1301 (a) (1) limit mrem/yr 100.0% of limit 0.38 ist Qtr TEDE 9.56E Compliance Sw 2nd Qtr9.51E-02 mmary -3rd Qtr 9.39E-IOCFR20 4th Qtr-02 9.70E-02% of Limit 0.38 Page 37 of 94 LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2010)RADIOLOGICAL IMPACT ON MAN MAXIMUM DOSES RESULTING FROM RELEASES AND COMPLIANCE STATUS LASALLE STATION UNIT TWO 10 CFR 20 COMPLIANCE ASSESSMENT PERIOD OF ASSESSMENT 01/01/10 TO 12/31/10 CALCULATED 03/21/11 2. 10 CFR 20.1301 (d)/40 CFR 190 Compliance Whole Body (DDE)Organ Dose (CDE)Plume Skyshine ISFSI Ground Total Thyroid Gonads Breast Lung Marrow Bone Remainder CEDE TEDE Dose (mrem)0. OOE+00 3 .52E-01 2 .94E-02 0. OOE+00 3.81E-01 0. OOE+00 0. OOE+00 0. OOE+00 0. OOE+00 0. OOE+00 0. OOE+00 0. OOE+00 0. OOE+00 3.81E-01 Limit % of (mrem) Limit 25.0 75.0 25.0 25.0 25.0 25.0 25.0 25.0 100.0 1.52 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.38 Page 38 of 94 LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2010)METEOROLOGICAL DATA LaSalle County Generating Station Period of Record: January -March 2010 Stability Class -Extremely Unstable -200Ft-33Ft Delta-T (F)Winds Measured at 33 Feet Wind Speed (in mph)Wind Direction N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW Variable 1-3 4-7 8-12 2 2 3 8 0 3 0 0 0 0 2 4 1 4 1 0 1 0 0 0 0 0 0 0 0 0 0 1 0 1 0 4 0 0 13-18 1 12 8 0 0 0 0 0 0 3 1 5 3 0 0 0 0 19-24> 24 Total 5 25 11 0 0 6 6 1 3 5 1 5 4 1 1 4 0 Total 4 10 27 33 4 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: 3 Page 39 of 94 LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2010)METEOROLOGICAL DATA LaSalle County Generating Station Period of Record: January -March 2010 Stability Class -Moderately Unstable -200Ft-33Ft Delta-T (F)Winds Measured at 33 Feet Wind Direction N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW Variable Wind Speed (in mph)1-3 4-7 8-12 13-18 19-24 > 24 Total 0 23 6 1 1 6 0 1 1 0 1 0 2 1 2 1 0 0 21 6 1 0 0 0 0 5 0 0 2 2 0 0 0 0 2 44 13 3 2 7 4 1 6 2 1 3 4 1 2 2 0 Total 0 10 46 37 4 0 97 Hours of calm in Hours of missing this stability class: 0 wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 3 Page 40 of 94 LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2010)METEOROLOGICAL DATA LaSalle County Generating Station Period of Record: January -March 2010 Stability Class -Slightly Unstable -200Ft-33Ft Delta-T (F)Winds Measured at 33 Feet Wind Speed (in mph)Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N NNE NE ENE E ESE 0 0 0 0 0 SE SSE S SSW SW WSW 0 0 0 0 1 0 0 0 0 0 1 0 4 0 0 0 1 1 1 0 1 2 0 0 3 6 1 0 8 1 1 1 0 2 4 1 0 4 1 3 7 5 9 5 5 1 7 10 0 0 0 0 0 0 0 0 0 0 0 1 2 0 0 0 0.3 0 0 5 0 0 3 1 0 14 0 18 8 0 0 6 0 11 0 10 4 0 5 0 12 0 31 W 1 20 WNW NW NNW Variable Total 2 0 4 0 4 0 1 0 8 1 1 0 0 0 0 0 0 7 1 6 0 2 17 59 61 0 142 Hours of calm in this Hours of missing wind stability class: measurements in this 0 stability class: 0 Hours of missing stability measurements in all stability classes: 3 Page 41 of 94 LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2010)METEOROLOGICAL DATA LaSalle County Generating Station Period of Record: January -March 2010 Stability Class -Neutral -200Ft-33Ft Delta-T (F)Winds Measured at 33 Feet Wind Speed (in mph)Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW 2 55 34 2 0 26 45 27 0 9 10 10 0 2 3 1 1 7 9 28 1 14 28 11 11 1 13 25 5 14 0 7 9 2 3 3 4 11 8 6 2 4 2 5 6 0 0 0 1 1 0 0 0 93 0 100 0 32 0 46 0 65 0 47 0 34 0 11 0 23 0 13 0 30 0 42 2 114 0 170 0 80 0 123 1 5 6 8 12 5 15 16 0 22 50 26 14 1 13 83 68 1 20 35 24 5 0 0 31 42 39 11 Variable Total 0 0 0 406 0 268 0 49 0 0 27 271 2 1023 Hours of calm in Hours of missing Hours of missing this stability class: wind measurements in this stability measurements in 0 stability class: 1 all stability classes: 3 Page 42 of 94 LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2010)METEOROLOGICAL DATA LaSalle County Generating Station Period of Record: January -March 2010 Stability Class -Slightly Stable Winds Measured at-200Ft-33Ft Delta-T (F)33 Feet Wind Speed (in mph)Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N NNE NE ENE E ESE SE SSE S SSW 1 15 6 1 14 14 2 0 2 4 1 12 1 16 16 0 2 1 2 1 3 8 1 3 0 1 1 1 2 2 8 8 5 4 6 4 3 8 9 4 2 0 0 0 0 1 0 0 0 0 1 2 0 7 1 0 0 0 0 9 0 22 0 31 0 15 0 35 0 19 0 26 0 11 0 10 0 22 0 20 2 11 SW 3 2 WSW W WNW 1 9 1 1 0 7 1 12 34 0 14 57 11 1 56 0 83 0 42 0 33 NNW 0 2 0 7 33 9 21 2 1 0 Variable 0 0 0 0 Total 16 128 227 57 12 1 441 Hours of calm in Hours of missing Hours of missing this stability class: wind measurements in this stability measurements in 0 stability class: 0 all stability classes: 3 Page 43 of 94 LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2010)METEOROLOGICAL DATA LaSalle County Generating Station Period of Record: January -March 2010 Stability Class -Moderately Stable Winds Measured at-200Ft-33Ft Delta-T (F)33 Feet Wind Speed (in mph)Wind Direction N NNE NE ENE 1-3 2 0 0 0 0 4-7 6 0 0 0 6 8-12 13-18 19-24 > 24 Total E 0 0 0 2 9 8 2 1 1 0 0 0 0 0 1 0 3 7 ESE SE SSE S SSW SW WSW W 0 0 2 0 0 0 1 6 7 4 1 1 0 4 0 0 0 0 0 0 0 0 0 3 2 0 0 0 0 0 0 5 0 0 0 0 8 0 0 2 0 15 0 15 0 9 0 10 0 9 3 15 8 9 1 2 0 0 22 0 11 0 16 0 47 0 57 0 17 0 14 33 0 26 31 0 6 11 NW NNW Variable Total 0 0 4 0 1 0 0 0 0 0 29 0 0 5 0 5 85 119 0 243 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: 3 Page 44 of 94 LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2010)METEOROLOGICAL DATA LaSalle County Generating Station Period of Record: January -March 2010 Stability Class -Extremely Stable -200Ft-33Ft Delta-T (F)Winds Measured at 33 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 2 3 0 0 0 5 ESE 0 4 1 0 0 0 5 SE 0 8 4 0 0 0 12 SSE 0 6 0 0 0 0 6 S 0 2 1 0 0 0 3 SSW 0 0 9 1 0 0 10 SW 0 0 1 1 0 0 2 WSW 0 1 6 1 0 0 8 W 0 10 24 0 0 0 34 WNW 0 13 29 0 0 0 42 NW 1 2 0 0 0 0 3 NNW 1 0 0 0 0 0 1 Variable 0 0 0 0 0 0 0 Total 2 48 78 3 0 0 131 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: 3 Page 45 of 94 LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2010)METEOROLOGICAL DATA LaSalle County Generating Station Period of Record: January -March 2010 Stability Class -Extremely Unstable -375Ft-33Ft Delta-T (F)Winds Measured at 375 Feet Wind Direction N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW Variable Total Wind Speed (in mph)1-3 4-7 8-12 13-18 19-24 > 24 0 0 0 0 0 0 0 0 0 2 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 Total 0 0 0 0 2 0 0 0 0 0 0 0 0 0 0 0 0 0 2 2 Hours of calm in Hours of missing this stability class: 0 wind measurements in this stability class: 2 Hours of missing stability measurements in all stability classes: 3 Page 46 of 94 LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2010)METEOROLOGICAL DATA LaSalle County Generating Station Period of Record: January -Stability Class -Moderately Unstable Winds Measured at 375 March 2010-375Ft-33Ft Delta-T (F)Feet Wind Speed (in mph)Wind Direction N NNE NE ENE E ESE SE SSE S SSW SW WSW W 1-3 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 1 4-7 8-12 13-18 0 0 0 0 0 0 0 0 0 0 0 0 2 19-24 > 24 Total 1 0 2 0 2 0 0 0 0 0 0 0 0 0 0 0 0 5 NNW Variable Total 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: 3 Page 47 of 94 LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2010)METEOROLOGICAL DATA LaSalle County Generating Station Period of Record: January -Stability Class -Slightly Unstable Winds Measured at 375 March 2010-375Ft-33Ft Delta-T (F)Feet Wind Speed (in mph)Wind Direction N NNE NE ENE E ESE SE 1-3 0 0 0 0 0 0 0 4-7 8-12 13-18 19-24 > 24 Total 0 0 3 4 3 11 0 1 0 1 0 0 0 0 0 3 SSE 0 S 1 SSW SW WSW W WNW 0 0 0 0 0 0 0 0 1 2 0 1 0 4 5 0 3 5 0 0 0 0 NW NNW Variable 0 0 0 0 0 Total 1 1 11 18 7 39 3 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 3 Hours of missing stability measurements in all stability classes: Page 48 of 94 LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2010)METEOROLOGICAL DATA LaSalle County Generating Station Period of Record: January -March 2010 Stability Class -Neutral -375Ft-33Ft Delta-T (F)Winds Measured at 375 Feet Wind Speed (in mph)Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 6 40 35 2 4 87 NNE 0 14 46 52 61 12 185 NE 0 3 5 26 33 10 77 ENE 1 7 5 17 21 3 54 E 2 10 14 15 10 2 53 ESE 1 7 15 17 11 0 51 SE 0 3 20 19 9 3 54 SSE 1 1 12 6 0 0 20 S 3 9 5 6 5 0 28 SSW 3 2 5 5 2 4 21 SW 4 6 13 2 3 4 32 WSW 2 5 8 22 10 2 49 W 0 8 14 28 25 13 88 WNW 0 6 30 74 22 8 140 NW 0 5 27 40 55 11 138 NNW 0 5 13 32 7 15 72 Variable 0 0 0 0 0 0 0 Total 17 97 272 396 276 91 1149 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 110 Hours of missing stability measurements in all stability classes: 3 Page 49 of 94 LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2010)METEOROLOGICAL DATA LaSalle County Generating Station Period of Record: January -March 2010 Stability Class -Slightly Stable -375Ft-33Ft Delta-T (F)Winds Measured at 375 Feet Wind Speed (in mph)Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 1 2 6 18 6 0 33 NNE 0 4 14 9 1 3 31 NE 0 3 4 9 3 3 22 ENE 0 1 4 2 0 0 7 E 1 2 14 10 12 4 43 ESE 0 3 5 1 0 2 11 SE 0 1 3 8 6 18 36 SSE 1 3 9 5 1 7 26 S 0 5 2 4 2 12 25 SSW 1 3 3 0 3 11 21 SW 3 5 2 4 8 13 35 WSW 1 3 0 3 4 0 11 W 1 3 6 7 7 10 34 WNW 1 2 10 40 17 5 75 NW 1 9 11 27 31 8 87 NNW 0 2 1 22 22 4 51 Variable 0 0 0 0 0 0 0 Total 11 51 94 169 123 100 548 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: 3 Page 50 of 94 LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2010)METEOROLOGICAL DATA LaSalle County Generating Station Period of Record: January -March 2010 Stability Class -Moderately Stable -375Ft-33Ft Delta-T (F)Winds Measured at 375 Feet Wind Speed (in mph)Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 0 5 7 2 14 NNE 0 0 1 0 0 0 1 NE 0 3 0 0 1 0 4 ENE 0 1 0 0 0 0 1 E 0 0 0 3 4 0 7 ESE 0 0 0 2 4 0 6 SE 0 1 1 6 9 5 22 SSE 0 0 0 2 0 5 7 S 0 0 1 3 1 0 5 SSW 0 0 0 0 1 6 7 SW 0 0 1 2 2 17 22 WSW 0 0 0 0 8 1 9 W 0 1 1 2 3 1 8 WNW 0 1 6 11 3 0 21 NW 1 1 9 19 14 0 44 NNW 0 2 3 8 10 0 23 Variable 0 0 0 0 0 0 0 Total 1 10 23 63 67 37 201 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: 3 Page 51 of 94 LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2010)METEOROLOGICAL DATA LaSalle County Generating Station Period of Record: January -March 2010 Stability Class -Extremely Stable -375Ft-33Ft Delta-T (F)Winds Measured at 375 Feet Wind Speed (in mph)Wind Direction N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW Variable 1-3 4-7 8-12 13-18 19-24 > 24 Total 1 1 0 1 1 0 0 0 0 0 0 0 0 0 0 0 0 7 1 2 0 0 0 0 0 0 0 0 0 0 0 1 3 0 2 0 0 0 0 0 0 2 4 0 0 0 4 2 13 17 0 7 0 0 0 0 1 1 2 6 1 0 2 3 0 2 1 0 0 0 0 0 0 0 0 2 0 0 0 0 0 0 0 1 0 17 2 2 1 1 1 1 6 10 1 0 2 7 2 16 23 0 Total 1 4 14 44 26 3 92 Hours of calm in Hours of missing this stability class: 0 wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 3 Page 52 of 94 LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2010)METEOROLOGICAL DATA LaSalle County Generating Station Period of Record: April -June 2010 Stability Class -Extremely Unstable -200Ft-33Ft Delta-T (F)Winds Measured at 33 Feet Wind Speed (in mph)Wind Direction N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW Variable 1-3 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 4-7 8-12 13-18 19-24 > 24 Total 0 0 0 0 0 0 0 0 5 5 0 1 1 0 0 0 0 0 9 9 6 0 1 0 0 0 0 0 0 1 7 0 0 0 Total 0 0 4 10 9 11 34 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stabi lity class: 0 Hours of missing stability measurements in all stability classes: 0 Page 53 of 94 LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2010)METEOROLOGICAL DATA LaSalle County Generating Station Period of Record: April -June 2010 Stability Class -Moderately Unstable -200Ft-33Ft Delta-T (F)Winds Measured at 33 Feet Wind Speed (in mph)Wind Direction N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW Variable 1-3 4-7 8-12 13-18 19-24 > 24 Total 0 2 2 0 0 0 0 0 4 10 14 9 12 9 0 0 0 Total 0 0. 32 22 5 3 62 Hours of calm in Hours of missing this stability class: 0 wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 0 Page 54 of 94 LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2010)METEOROLOGICAL DATA LaSalle County Generating Station Period of Record: April -June 2010 Stability Class -Slightly Unstable -20 Winds Measured at 33 Feet Wind Speed (in mph Wind Direction 1-3 4-7 8-12 13-18 N 0 0 7 1 NNE 0 0 5 0 NE 0 0 3 6 ENE 0 0 1 2 E 0 0 0 0 ESE 0 0 0 0 SE 0 0 0 0 SSE 0 0 0 0 S 0 1 5 5 OFt-33Ft Delta-T (F)19-24 > 24 Total 0 0 0 0 0 0 0 0 4 1 2 2 0 1 0 1 0 0 0 0 0 0 0 0 0 8 5 9 3 0 0 0 0 SSW SW WSW W WNW NW NNW Variable 0 0 0 0 0 0 0 0 0 0 1 0 1 0 2 3 0 5 4 5 7 4 0 0 0 3 4 5 9 5 3 6 0 2 17 2 11 0 11 0 12 0 17 0 10 0 5 0 10 0 0 Total 8 46 49 11 4 118 0 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: 0 Page 55 of 94 LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2010)METEOROLOGICAL DATA LaSalle County Generating Station Period of Record: April -June 2010 Stability Class -Neutral Winds Measured at-200Ft-33Ft Delta-T (F)33 Feet Wind Speed (in mph)Wind Direction N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW Variable 1-3 4-7 8-12 13-18 19-24 > 24 Total 42 29 25 19 25 10 15 13 14 13 12 12 16 14 9 19 0 18 18 34 26 21 14 10 18 21 16 29 13 24 23 12 15 0 8 7 24 32 16 16 15 6 8 12 14 10 17 24 11 23 0 0 0 1 9 2 19 4 2 5 10 2 2 7 5 6 0 0 71 55 85 88 65 66 45 42 51 55 58 39 64 68 39 59 0 Total 22 287 312 243 74 12 950 Hours of calm in this stability class: 0 Hours of missing wind measurements in this s Hours of missing stability measurements in a tability class: 11 stability cl 0 asses: 0 Page 56 of 94 LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2010)METEOROLOGICAL DATA LaSalle County Generating Station Period of Record: April -June 2010 Stability Class -Slightly Stable -200Ft-33Ft Delta-T (F)Winds Measured at 33 Feet Wind Speed (in mph)Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N NNE NE ENE E ESE SE SSE 3 2 0 2:4 6:3 4 4 11 1 0 1 3 0 6 17 18 3 26 44 16 3 1 2 1 3 0 7 17 2 5 4 4 3 2 10 S SSW SW 4 13 19 9 15 13 7 24 13 0 0 0 0 3 8 3 0 2 6 1 0 5 8 0 0 0 0 34 0 27 0 19 0 41 0 92 0 39 0 15 0 17 0 39 1 47 WSW W WNW NW NNW Variable 2 10 24 1 7 24 0 14 16 3 7 0 2 2 0 0 45 0 39 2 46 2 40 0 20 0 22 3 7 1 10 8 9 0 0 0 0 0 Total 26 162 247 106 36 5 582 Hours of calm in this stability class: Hours of missing wind measurements in this Hours of missing stability measurements in 0 stability class: 0 all stability classes: 0 Page 57 of 94 LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2010)METEOROLOGICAL DATA LaSalle County Generating Station Period of Record: April -June 2010 Stability Class -Moderately Stable Winds Measured at-200Ft-33Ft Delta-T (F)33 Feet Wind Speed (in mph)Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N NNE NE ENE E ESE SE SSE S 1 11 0 1 1 2 0 1 1 0 0 1 4 14 19 0 18 10 1 8 10 0 9 10 0 0 0 0 1 0 0 3 8 0 0 0 0 0 0 0 0 0 0 0 0 2 1 3 0 13 0 18 9 0 38 0 28 0 19 0 22 0 35 0 25 0 32 0 25 0 24 0 23 SSW SW WSW W WNW NW NNW Variable Total 2 5 6 12 2 11 17 1 10 14 1 14 1 16 1 5 2 6 0 0 18 148 9 6 0 0 0 112 2 0 0 0 0 0 0 26 0 0 0 6 8 0 0 304 Hours of calm in Hours of missing Hours of missing this stability class: wind measurements in this stability measurements in 1 stability class: 0 all stability classes: 0 Page 58 of 94 LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2010)METEOROLOGICAL DATA LaSalle County Generating Station Period of Record: April -June 2010 Stability Class -Extremely Stable -200Ft-33Ft Delta-T (F)Winds Measured at 33 Feet Wind Speed (in mph)Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 NNE NE ENE 0 0 0 4 0 1 0 2 E 0 0 0 0 0 0 4 6 8 ESE SE SSE 0 10 2 10 0 9 0 5 S 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 2 0 10 0 16 0 15 0 14 0 17 0 17 0 18 0 13 4 0 1 0 SSW SW WSW 1 4 12 7 10 0 2 10 W 1 WNW NW NNW Variable Total 0 0 0 0 9 5 0 0 0 6 3 1 0 0 0 0 0 0 0 6 0 0 0 6 76 50 stability class: measurements in this 0 133 Hours of calm in this Hours of missing wind 0 stability class: 0 Hours of missing stability measurements in all stability classes: 0 Page 59 of 94 LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2010)METEOROLOGICAL DATA LaSalle County Generating Station Period of Record: April -June 2010 Stability Class -Extremely Unstable -375Ft-33Ft Delta-T (F)Winds Measured at 375 Feet Wind Speed (in mph)Wind Direction N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW Variable Total 1-3 4-7 8-12 13-18 19-24 > 24 Total 1 I Hours of calm in this stability class: Hours of missing wind measurements in this Hours of missing stability measurements in 0 stability class: all stability cl 0 asses: 0 Page 60 of 94 LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2010)METEOROLOGICAL DATA LaSalle County Generating Station Period of Record: April -Stability Class -Moderately Unstable Winds Measured at 375 June 2010-375Ft-33Ft Delta-T (F)Feet Wind Speed (in mph)Wind Direction N NNE NE ENE E ESE SE SSE S SSW SW WSW W 1-3 0 0 0 0 0 0 0 0 0 0 0 0 0 0 4-7 8-12 13-18 19-24 > 24 Total 0 0 0 0 0 0 0 0 4 3 1 0 0 0 0 0 0 0 0 2 0 0 0 0 0 4 4 1 WNW 0 0 0 0 0 0 NW 0 NNW Variable Total 0 0 0 8 11 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: 0 Page 61 of 94 LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2010)METEOROLOGICAL DATA LaSalle County Generating Station Period of Record: April -Stability Class -Slightly Unstable Winds Measured at 375 June 2010-375Ft-33Ft Delta-T (F)Feet Wind Speed (in mph)Wind Direction N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW Variable 1-3 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 4-7 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 8-12 13-18 19-24 > 24 Total 0 0 0 0 1 3 0 0 0 0 0 4 0 0 0 0 0 4 6 10 5 2 0 0 0 0 0 8 2 0 1 0 0 0 Total 0 0 0 5 7 17 29 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: 0 Page 62 of 94 LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2010)METEOROLOGICAL DATA LaSalle County Generating Station Period of Record: April -June 2010 Stability Class -Neutral -375Ft-33Ft Delta-T (F)Winds Measured at 375 Feet Wind Speed (in mph)Wind Direction N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW Variable 1-3 4-7 8-12 13-18 19-24 > 24 Total 14 13 15 12 9 17 6 2 7 7 7 10 9 5 7 12 0 15 35 23 21 20 11 5 19 19 20 30 12 19 22 11 17 0 299 9 15 35 30 13 10 14 10 17 16 17 21 23 22 18 11 0 281 14 8 19 28 19 18 13 1 5 10 20 17 16 30 23 20 0 261 1 0 6 10 7 25 14 2 10 23 9 4 7 3 13 2 0 53 73 98 101 68 82 53 37 59 76 83 65 74 82 74 63 0 Total 12 152 136 1141 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: 0 Page 63 of 94 LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2010)METEOROLOGICAL DATA LaSalle County Generating Station Period of Record: April -June 2010 Stability Class -Slightly Stable -375Ft-33Ft Winds Measured at 375 Feet Delta-T (F)Wind Speed (in mph)Wind Direction N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW Variable 1-3 4-7 8-12 13-18 19-24 > 24 Total 3 4 8 10 4 2 2 0 3 0 2 2 4 2 3 7 0 2 3 17 19 16 6 3 3 3 4 1i 1i 9 5 12 1 0 11 18 16 22 22 15 9 5 13 13 14 24 21 12 12 11 0 1 6 1 10 10 14 8 1 8 10 29 8 24 14 16 3 0 1 0 0 0 8 11 7 6 22 39 11 2 4 22 0 1 0 19 31 42 61 61 48 29 15 50 67 68 47 64 56 43 25 0 Total 10 56 125 238 163 134 726 Hours of calm in this stability class: Hours of missing wind measurements in this Hours of missing stability measurements in 0 stability class: 0 all stability classes: 0 Page 64 of 94 LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2010)METEOROLOGICAL DATA LaSalle County Generating Station Period of Record: April -June 2010 Stability Class -Moderately Stable -375Ft-33Ft Delta-T (F)Winds Measured at 375 Feet Wind Speed (in mph)Wind Direction N NNE NE ENE E ESE 1-3 0 0 1 0 0 0 4-7 8-12 13-18 19-24 > 24 Total SE 0 SSE 0 S SSW 1 2 1 3 1 1 0 1 1 0 2 2 1 2 1 5 0 0 0 0 7 4 2 0 2 4 3 2 0 2 2 1 1 4 7 7 0 2 0 0 2 8 8 5 2 15 10 0 10 0 0 0 1 SW 9 6 1 7 1 3 3 9 7 3 WSW 0 W 1 8 11 7 1 5 3 2 2 0 0 1 18 6 24 4 20 0 30 3 23 6 20 2 14 0 28 0 11 WNW 0 0 NW 2 0 1 0 7 4 5 0 NNW 3 0 0 0 6 9 0 Variable Total 0 9 20 44 85 55 23 236 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: 0 Page 65 of 94 LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2010)METEOROLOGICAL DATA LaSalle County Generating Station Period of Record: April -June 2010 Stability Class -Extremely Stable -375Ft-33Ft Delta-T (F)Winds Measured at 375 Feet Wind Speed (in mph)Wind Direction N NNE NE ENE E ESE SE SSE S SSW SW 1-3 0 0 0 0 0 0 0 0 0 0 0 0 4-7 8-12 13-18 19-24 > 24 Total 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 5 9 7 11 WSW W WNW NW 0 0 0 0 0 0 4 0 0 0 0 0 0 1 NNW 8 4 2 0 0 0 Variable Total 2 5 12 9 12 40 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 0 Page 66 of 94 LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2010)METEOROLOGICAL DATA LaSalle County Generating Station Period of Record: July -September 2010 Stability Class -Extremely Unstable -200Ft-33Ft Delta-T (F)Winds Measured at 33 Feet Wind Speed (in mph)Wind Direction N NNE NE ENE E 1-3 0 0 0 0 0 0 0 0 0 4-7 0 0 0 0 0 0 0 0 0 0 0 8-12 13-18 19-24 > 24 Total ESE SE SSE 1 0 0 0 0 0 0 0 1 8 0 4 0 S 0 0 0 0 0 0 0 0 0 0 1 1 0 0 0 0 2 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 1 SSW SW WSW W 0 0 0 0 0 0 0 0 0 0 4 0 0 0 0 0 0 5 3 2 12 0 13 0 3 2 10 0 12 NW NNW Variable 0 0 0 1 0 0 0 0 0 1 0 0 Total 0 18 25 2 47 0 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: 0 Page 67 of 94 LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2010)METEOROLOGICAL DATA LaSalle County Generating Station Period of Record: July -September 2010 Stability Class -Moderately Unstable -200Ft-33Ft Delta-T (F)Winds Measured at 33 Feet Wind Speed (in mph)Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N NNE NE ENE E ESE SE SSE S SSW 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 1 0 1 0 0 0 0 0 0 3 1 0 0 0 0 0 0 0 1 5 7 3 1 5 4 1 0 0 0 0 0 0 0 0 0 0 1 2 1 0 0 0 0 0 4 0 0 0 0 0 0 0 0 1 2 0 0 0 0 0 0 0 5 4 12 SW WSW 5 2 1 8 5 8 0 22 0 22 1 12 0 10 0 18 W WNW 1 12 NW NNW Variable 0 1 0 2 2 0 0 0 0 6 4 0 Total 0 16 53 28 1 102 Hours of calm in this Hours of missing wind stability class: measurements in this 0 stability class: 0 Hours of missing stability measurements in all stability classes: 0 Page 68 of 94 LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2010)METEOROLOGICAL DATA LaSalle County Generating Station Period of Record: July -September 2010 Stability Class -Slightly Unstable -200Ft-33Ft Delta-T (F)Winds Measured at 33 Feet Wind Speed (in mph)Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 4 5 0 0 0 9 NNE 0 11 1 0 0 0 12 NE 0 3 2 0 0 0 5 ENE 0 0 0 0 0 0 0 E 0 1 2 0 0 0 3 ESE 0 0 0 1 0 0 1 SE 0 0 0 0 0 0 0 SSE 0 2 3 0 0 0 5 S 0 6 16 6 0 0 28 SSW 0 10 10 3 1 0 24 SW 0 9 11 4 0 0 24 WSW 0 3 2 2 0 0 7 W 0 10 5 2 1 0 18 WNW 0 7 13 8 0 0 28 NW 0 2 7 2 0 0 11 NNW 0 0 9 6 0 0 15 Variable 0 0 0 0 0 0 0 Total 0 68 86 34 2 0 190 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 0 Page 69 of 94 LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2010)METEOROLOGICAL DATA LaSalle County Generating Station Period of Record: July -September 2010 Stability Class -Neutral -200Ft-33Ft Delta-T (F)Winds Measured at 33 Feet Wind Speed (in mph)Wind Direction N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW Variable 1-3 4-7 8-12 13-18 19-24 > 24 Total 35 22 18 15 15 12 15 11 19 21 19 20 23 21 16 18 0 10 10 13 16 17 9 6 20 33 21 13 10 14 24 19 25 0 0 0 0 2 5 6 0 0 14 11 6 9 9 10 4 8 0 47 35 34 33 38 29 24 36 71 53 45 43 58 59 39 51 0 Total 35 300 260 84 15 1 695 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: 0 Page 70 of 94 LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2010)METEOROLOGICAL DATA LaSalle County Generating Station Period of Record: July -Stability Class -Slightly Stable Winds Measured at September 2010-200Ft-33Ft Delta-T (F)33 Feet Wind Speed (in mph)Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW 1 33 12 1 14 3 4 2 5 0 0 0 3 0 0 0 0 3 5 12 0 20 20 2 13 3 14 3 7 0 0 0 0 9 5 8 12 0 46 0 17 0 12 0 23 0 40 0 18 0 24 0 25 0 76 1 77 0 36 0 28 4 47 0 46 0 16 0 28 5 13 48 1 23 32 13 2 13 11 2 13 10 5 14 11 5 17 16 8 3 5 7 0 0 0 NW 2 6 8 NNW 3 9 16 Variable 0 0 0 0 0 Total 43 219 225 48 19 5 559 Hours of calm in Hours of missing Hours of missing this stability class: wind measurements in this stability measurements in 1 stability class: 0 all stability classes: 0 Page 71 of 94 LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2010)METEOROLOGICAL DATA LaSalle County Generating Station Period of Record: July -Stability Class -Moderately Stable Winds Measured at September 2010-200Ft-33Ft Delta-T (F)33 Feet Wind Speed (in mph)Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N NNE NE ENE E 3 19 1 1 1 3 1 0 0 0 0 1 9 0 0 0 0 0 0 0 0 0 0 0 22 0 0 0 4 2 2 ESE SE SSE S SSW SW WSW W WNW NW NNW Variable Total 3 21 6 19 5 28 0 20 5 31 0 2 4 11 0 33 0 25 0 35 0 24 0 47 0 44 0 19 0 25 0 25 0 41 2 19 21 3 11 3 2 11 11 7 8 10 4 31 1 1 0 5 4 0 6 0 2 0 80 0 0 0 6 7 0 45 231 0 361 Hours of calm in Hours of missing Hours of missing this stability class: wind measurements in this stability measurements in 0 stability class: 0 all stability classes: 0 Page 72 of 94 LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2010)METEOROLOGICAL DATA LaSalle County Generating Station Period of Record: July -Stability Class -Extremely Stable Winds Measured at September 2010-200Ft-33Ft Delta-T (F)33 Feet Wind Speed (in mph)Wind Direction N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW Variable Total 1-3 0 0 0 0 0 4-7 8-12 13-18 19-24 > 24 Total 0 0 0 0 4 8 0 0 0 0 2 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 6 8 0 5 21 1 36 1 37 0 39 0 21 1 21 2 11 0 10 0 0 2 8 9 7 5 1 0 0 0 34 0 26 0 37 0 40 0 47 0 30 0 29 0 18 0 11 0 0 0 1 0 0 0 0 0 1 0 0 10 209 0 253 Hours of calm in Hours of missing Hours of missing this stability class: wind measurements in this stability measurements in 0 stability class: 0 all stability classes: 0 Page 73 of 94 LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2010)METEOROLOGICAL DATA LaSalle County Generating Station Period of Record: July -September 2010 Stability Class -Extremely Unstable -375Ft-33Ft Delta-T (F)Winds Measured at 375 Feet Win Wind Direction 1-3 4-7 N 0 NNE 0 NE 0 ENE 0 E 0 ESE 0 SE 0 SSE 0 S 0 SSW 0 SW 0 WSW 0 W 0 WNW 0 NW 0 NNW 0 Variable 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 d Speed (in mph)8-12 13-18 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 19-24 > 24 Total Total 0 0 0 0 0 0 Hours of calm in Hours of missing this stability class: wind measurements in this 0 stability class: all stability cl Hours of missing stability measurements in 0 asses: 0 Page 74 of 94 LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2010)METEOROLOGICAL DATA LaSalle County Generating Station Period of Record: July -September 2010 Stability Class -Moderately Unstable -375Ft-33Ft Delta-T (F)Winds Measured at 375 Feet Wind Speed (in mph)Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 0 0 0 0 0 NNE 0 0 0 0 0 0 0 NE 0 0 0 0 0 0 0 ENE 0 0 0 0 0 0 0 E 0 0 0 0 0 0 0 ESE 0 0 0 0 0 0 0 SE 0 0 0 0 0 0 0 SSE 0 0 0 0 0 0 0 S 0 0 0 0 0 0 0 SSW 0 0 0 0 1 0 1 SW 0 0 0 0 0 0 0 WSW 0 0 0 1 0 1 2 W 0 0 0 0 0 0 0 WNW 0 0 0 0 0 0 0 NW 0 0 0 0 0 0 0 NNW 0 0 0 0 0 0 0 Variable 0 0 0 0 0 0 0 Total 0 0 0 1 1 1 3 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: 0 Page 75 of 94 LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2010)METEOROLOGICAL DATA LaSalle County Generating Station Period of Record: July -September 2010 Stability Class -Slightly Unstable -375Ft-33Ft Delta-T (F)Winds Measured at 375 Feet Wind Speed (in mph)Wind Direction N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW Variable 1-3 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 4-7 8-12 13-18 19-24 > 24 Total 0 0 0 0 0 0 0 0 0 0 1 1 0 0 0 0 0 0 0 1 9 4 8 4 0 0 0 0 0 6 6 2 2 0 Total 0 0 9 19 6 5 39 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: 0 Page 76 of 94 LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2010)METEOROLOGICAL DATA LaSalle County Generating Station Period of Record: July -September 2010 Stability Class -Neutral -375Ft-33Ft Delta-T (F)Winds Measured at 375 Feet Win Wind Direction 1-3 N 0 NNE 2 NE 0 ENE 0 E 1 ESE 1 SE 4 SSE 2 S 2 SSW 3 SW 0 WSW 5 W 2 WNW 0 NW 1 NNW 0 Variable 0 4-7 10 17 4 9 10 12 10 7 11 12 12 10 15 18 11 13 0.d Speed (in mph)8-12 13-18 20 13 24 7 30 14 11 13 16 6 9 12 9 5 9 3 34 35 34 32 41 20 13 12 18 10 33 20 35 26 26 21 0 0 19-24 4 0 0 2 1 0 0 0 14 17 18 11 8 15 13 9 0> 24 0 0 0 0 0 0 0 0 4 10 10 2 4 4 2 0 0 Total 47 50 48 35 34 34 28 21 100 108 101 53 57 90 88 69 0 Total 23 181 362 249 112 36 963 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: 0 Page 77 of 94 LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2010)METEOROLOGICAL DATA LaSalle County Generating Station Period of Record: July -September 2010 Stability Class -Slightly Stable -375Ft-33Ft Winds Measured at 375 Feet Delta-T (F)Wind Speed (in mph)Wind Direction N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW variable 1-3 4-7 0 0 0 0 1 0 2 3 0 1 1 0 0 2 1 3 0 6 2 3 8 3 7 12 5 2 5 7 4 5 10 7 2 0 8-12 13-18 19-24 > 24 6 15 9 2 12 15 0 0 15 19 0 0 14 16 4 0 13 13 8 3 7 2 3 0 11 9 3 0 14 8 3 0 12 17 22 5 10 24 45 36 14 21 18 8 11 14 7 6 5 5 11 13 10 12 21 9 17 8 14 2 4 15 3 2 0 0 0 0 Total 38 29 37 42 41 19 37 33 58 121 69 42 39 64 49 29 0 Total 14 88 175 213 171 86 747 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: 0 Page 78 of 94 LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2010)METEOROLOGICAL DATA LaSalle County Generating Station Period of Record: July -September 2010 Stability Class -Moderately Stable -375Ft-33Ft Winds Measured at 375 Feet Delta-T (F)Wind Speed (in mph)Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 1 1 NNE NE 0 ENE 1 E ESE 0 0 0 1 1 0 0 0 1 1 1 5 1 2 1 2 3 0 2 2 4 8 0 6 0 0 0 0 4 0 1 0 11 2 0 SE 7 7 1 15 8 14 7 20 5 4 1 SSE S 1 9 19 12 8 20 23 SSW SW WSW W WNW NW 3 1 0 0 0 0 0 0 1 14 0 22 0 27 0 34 0 42 7 63 4 43 1 26 1 24 0 13 0 35 0 21 4 9 21 1 10 13 4 1 2 2 2 1 0 6 2 5 10 7 6 21 4 13 2 6 3 0 NNW Variable Total 0 0 0 0 9 24 78 188 75 16 390 Hours of calm in this Hours of missing wind stability class: measurements in this 0 stability class: 0 Hours of missing stability measurements in all stability classes: 0 Page 79 of 94 LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2010)METEOROLOGICAL DATA LaSalle County Generating Station Stability Period of Record: July -September 2010 Class -Extremely Stable -375Ft-33Ft Winds Measured at 375 Feet Delta-T (F)Wind Speed (in mph)Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N NNE NE ENE 0 0 0 0 0 E ESE SE SSE S SSW SW WSW W WNW NW NNW Variable Total 0 0 0 0 0 0 1 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 1 1 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 6 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 6 3 11 0 0 0 0 0 1 23 0 12 0 5 5 0 1 0 1 0 0 6 1 3 0 5 6 0 0 0 0 0 0 0 0 0 0 7 4 2 5 7 0 0 3 15 38 1 66 Hours of calm in this Hours of missing wind stability class: measurements in this 0 stability class: 0 Hours of missing stability measurements in all stability classes: 0 Page 80 of 94 LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2010)METEOROLOGICAL DATA LaSalle County Generating Station Period of Record: October -December2010 Class -Extremely Unstable -200Ft-33Ft Stability Delta-T (F)Winds Measured at 33 Feet Wind Speed (in mph)Wind Direction N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW Variable Total 1-3 4-7 8-12 13-18 19-24 > 24 Total 0 2 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: 34 Page 81 of 94 LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2010)METEOROLOGICAL DATA LaSalle County Generating Station Period of Record: October -December2010 Class -Moderately Unstable -200Ft-33Ft Stability Delta-T (F)Winds Measured at 33 Feet Wind Speed (in mph)Wind Direction N NNE NE ENE E ESE SE SSE S 1-3 0 0 0 0 0 0 0 0 0 4-7 8-12 13-18 19-24 > 24 Total 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 2 SSW 0 4 1 SW 0 WSW W WNW NW 0 0 0 0 0 0 0 1 0 0 0 0 0 8 NNW Variable Total Hours of calm in this stability class: Hours of missing wind measurements in this Hours of missing stability measurements in 0 stability class: 0 all stability classes: 34 Page 82 of 94 LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2010)METEOROLOGICAL DATA LaSalle County Generating Station Stability Period of Record: October Class -Slightly Unstable Winds Measured at-December2010

-200Ft-33Ft 33 Feet Delta-T (F)Wind Speed (in mph)Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N NNE NE ENE E ESE SE SSE S SSW SW WSW 0 0 0 0 0 0 0 0 0 0 3 0 0 0 0 0 0 0 4 7 7 1 W WNW NW 0 0 0 0 0 0 0 0 0 0 0 1 0 6 4 6 1 0 0 3 8 0 1 0 0 4 1 0 0 0 0 8 1 14 0 13 0 0 0 0 6 2 1 Variable Total 0 2 23 22 2 57 Hours of calm in this Hours of missing wind stability class: measurements in this 0 stability class: 0 Hours of missing stability measurements in all stability classes: 34 Page 83 of 94 LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2010)METEOROLOGICAL DATA LaSalle County Generating Station Period of Record: October -December2010 Stability Class -Neutral -200Ft-33Ft Winds Measured at 33 Feet Wind Speed (in mph)Wind Delta-T (F)Direction N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW Variable 1-3 4-7 0 1 0 0 0 1 1 0 0 1 1 1 1 1 0 0 0 21 7 4 3 3 4 2 0 1 1 4 8 10 8 7 11 0 8-12 13-18 19-24 > 24 26 12 0 1 14 0 0 0 10 1 0 0 14 9 0 0 17 7 1 0 8 7 3 0 3 1 0 0 5 12 1 0 10 13 2 0 14 3 2 0 16 7 9 2 18 22 21 7 29 27 14 0 39 60 12 0 13 17 0 0 22 53 8 12 0 0 0 0 Total 60 22 15 26 28 23 7 18 26 21 39 77 81 120 37 106 0 Total 8 94 258 251 73 22 706 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: 34 Page 84 of 94 LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2010)METEOROLOGICAL DATA LaSalle County Generating Station Period of Record: October -December2010 Stability Wind Direction N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW Variable Class -Slightly Stable Winds Measured at Wind Speed-200Ft-33Ft 33 Feet (in mph)Delta-T (F)1-3 4-7 8-12 13-18 19-24 > 24 2 30 20 0 0 0 4 12 6 0 0 0 2 4 13 0 0 0 1 5 22 9 0 0 1 8 16 9 0 0 1 4 9 9 1 0 4 3 5 13 5 4 3 1 6 32 9 7 1 1 6 20 3 2 3 3 7 12 17 1 0 3 11 15 2 2 0 4 22 12 1 2 1 11 13 19 18 2 1 10 27 25 10 0 0 7 24 5 0 0 2 11 22 9 1 0 0 0 0 0 0 0 Total 52 22 19 37 34 24 34 58 33 43 33 41 64 73 36 45 0 Total 26 117 229 189 67 20 648 Hours of calm in Hours of missing this stability class: 1 wind measurements in this stability class: 1 Hours of missing stability measurements in all stability classes: 34 Page 85 of 94 LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2010)METEOROLOGICAL DATA LaSalle County Generating Station Period of Record: October Stability Class -Moderately Stable Winds Measured at Wind Speed Wind-December2010

-200Ft-33Ft 33 Feet (in mph)Delta-T (F)Direction N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW Variable 1-3 4-7 8-12 13-18 19-24 > 24 Total 12 3 2 1 5 2 2 3 9 6 4 6 5 17 9 8 0 2 0 0 3 13 2 7 7 15 23 14 17 22 22 17 2 0 0 0 0 0 0 0 5 9 8 13 8 7 1 4 0 0 0 55 20 4 4 5 18 5 15 20 35 43 27 30 29 43 28 10 0 Total 15 94 166 6 0 336 0 es: 34 Hours of calm in this stability class: Hours of missing wind measurements in this Hours of missing stability measurements in 0 stability class: all stability class Page 86 of 94 LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2010)METEOROLOGICAL DATA LaSalle County Generating Station Period of Record: October -December2010 Stability Wind Direction N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW Variable Class -Extremely Stable Winds Measured at Wind Speed-200Ft-33Ft 33 Feet (in mph)Delta-T (F)1-3 4-7 8-12 13-18 19-24 > 24 Total 4 0 0 1 9 10 23 19 15 9 5 8 34 41 6 3 0 0 0 0 0 2 1 4 21 40 35 25 32 22 11 5 0 0 4 0 0 1 12 13 28 43 59 46 32 45 59 52 11 4 0 Total 10 187 198 14 0 0 409 Hours of calm in this stability class: Hours of missing wind measurements in this Hours of missing stability measurements in 0 stability class: all stability cl 0 asses: 34 Page 87 of 94 LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2010)METEOROLOGICAL DATA LaSalle County Generating Station Stability Period of Record: October -December2010 Class -Extremely Unstable -375Ft-33Ft Winds Measured at 375 Feet Delta-T (F)Wind Direction N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW Variable Total Wind Speed (in mph)1-3 4-7 8-12 13-18 19-24 > 24 Total 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 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: 34 Page 88 of 94 LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2010)METEOROLOGICAL DATA LaSalle County Generating Station Stability Period of Record: October -December2010 Class -Moderately Unstable -375Ft-33Ft Winds Measured at 375 Feet Delta-T (F)Wind Speed (in mph)Wind Direction N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW 1-3 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 4-7 8-12 13-18 19-24 > 24 Total 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 Variable Total 0 0 0 0 0 0 0 0 0 0 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: 34 Page 89 of 94 LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2010)METEOROLOGICAL DATA LaSalle County Generating Station Period of Record: October -December2010 Stability Class -Slightly Unstable -375Ft-33Ft Winds Measured at 375 Feet Delta-T (F)Wind Direction N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW Variable Total Wind Speed (in mph)1-3 4-7 8-12 13-18 19-24 > 24 Total 3 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: 34 Page 90 of 94 LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2010)METEOROLOGICAL DATA LaSalle County Generating Station Period of Record: October -December2010 Stability Class -Neutral -375Ft-33Ft Winds Measured at 375 Feet Delta-T (F)Wind Direction N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW Variable 1-3 4-7 0 11 0 12 0 0 1 3 0 1 1 3 0 2 0 1 0 1 1 0 1 2 0 4 1 5 0 3 1 5 0 6 0 0 Wind Speed (in mph)8-12 13-18 19-24 > 24 Total 7 10 5 8 7 7 3 1 3 5 15 5 21 20 29 7 0 27 17 14 11 13 9 1 5 13 13 11 22 23 38 21 13 0 27 1 0 6 6 4 5 7 12 4 12 19 26 36 32 40 0----- -----5 0 0 0 1 5 4 1 9 16 11 35 24 14 6 16 0 77 40 19 29 28 29 15 15 38 39 52 85 100 il1 94 82 0 853 Total 6 59 153 251 237 147 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 5 Hours of missing stability measurements in all stability classes: 34 Page 91 of 94 LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2010)METEOROLOGICAL DATA LaSalle County Generating Station Stability Period of Record: October -December2010 Class -Slightly Stable -375Ft-33Ft Winds Measured at 375 Feet Delta-T (F)Wind Speed (in mph)Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N NNE NE ENE E ESE SE SSE 0 0 1 1 0 0 1 0 0 0 7 3 7 14 9 10 13 5 5 18 1 11 11 9 1 9 4 5 4 1 32 0 41 0 30 0 33 0 33 4 24 9 25 4 0 4 4 2 1 1 8 17 5 10 2 1 5 2 5 3 11 36 55 1 12 35 55 S SSW SW WSW 9 6 23 41 1 1 6 12 11 21 52 1 11 11 7 5 36 W WNW NW 0 0 0 0 1 8 14 24 24 71 3 7 21 16 31 78 2 5 15 17 11 50 1 11 10 15 13 50 NNW Variable Total 0 0 0 5 46 100 0 177 0 165 0 0 213 706 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: 34 Page 92 of 94 LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2010)METEOROLOGICAL DATA LaSalle County Generating Station Stability Period of Record: October -December2010 Class -Moderately Stable -375Ft-33Ft Winds Measured at 375 Feet Delta-T (F)Wind Direction Wind Speed (in mph)1-3 4-7 8-12 13-18 19-24 > 24 Total N NNE ENE E ESE SE SSE S SSW SW WSW 0 4 0 0 0 0 0 0 0 0 0 0 3 3 2 4 4 2 2 1 1 1 2 2 3 1 2 2 5 3 0 2 1 0 0 2 0 0 2 12 2 22 0 14 1 11 6 6 2 6 3 0 13 4 4 4 3 17 7 6 5 2 21 5 15 13 25 59 3 9 20 33 66 3 12 6 9 32 6 10 12 11 41 W 1 1 3 9 23 1 2 0 0 2 11 10 9 8 7 44 1 34 0 33 0 23 3 1 0 7 13 5 0 7 10 Variable Total 0 0 128 0 0 8 34 65 113 94 442 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: 34 Page 93 of 94 LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2010)METEOROLOGICAL DATA LaSalle County Generating Station Stability Period of Record: October -December2010 Class -Extremely Stable -375Ft-33Ft Winds Measured at 375 Feet Delta-T (F)Wind Speed (in mph)Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N NNE NE ENE 0 0 0 0 0 E ESE 0 SE SSE S SSW SW WSW 0 0 0 0 0 0 0 0 0 0 0 0 0 2 0 0 1 0 0 1 0 0 0 0 2 0 0 1 0 3 2 0 0 0 2 4 2 1 13 2 3 0 0 1 0 1 3 1 0 0 0 0 0 0 0 9 8 7 7 9 3 2 1 0 0 0 0 0 0 0 5 6 1 0 7 0 0 2 2 1 5 1 14 7 2 3 4 5 1 24 0 14 0 22 2 15 0 19 0 18 0 13 W WNW NW 1 14 4 0 0 7 3 0 0 0 5 0 Variable Total 7 26 75 47 4 159 Hours of calm in this Hours of missing wind stability class: measurements in this 0 stability class: all stability cli Hours of missing stability measurements in 0 asses: 34 Page 94 of 94

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