RA21-029, Unit 2 - 2020 Annual Radioactive Effluent Release Report

From kanterella
Revision as of 08:02, 10 May 2021 by StriderTol (talk | contribs) (StriderTol Bot insert)
(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)
Jump to navigation Jump to search
Unit 2 - 2020 Annual Radioactive Effluent Release Report
ML21120A215
Person / Time
Site: LaSalle  Constellation icon.png
Issue date: 04/29/2021
From: Washko J
Exelon Generation Co
To:
Document Control Desk, Office of Nuclear Material Safety and Safeguards, Office of Nuclear Reactor Regulation
References
RA21-029
Download: ML21120A215 (75)
v • d • e


Text

LaSall e County Station 2601 North 21 st Road Exelon Generation Marseilles, IL 61341 815-415-2000 Telephone www.exeloncorp.com RA21-029 10 CFR 50.36a April 29, 2021 U. S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555-0001 LaSalle County Station, Unit 1 and Unit 2 Renewed Facility Operating License No. NFP-11 and NPF-18 NRC Docket No. 50-373, 50-374, and 72-70

Subject:

2020 Annual Radioactive Effluent Release Report Enclosed is the Exelon Generation Company, LLC, 2020 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."

There are no regulatory commitments contained within this letter. Should you have any questions concerning this letter, please contact Mr. Daniel Mearhoff, Regulatory Assurance Manager, at (815) 415-2800.

Respectfully,

./ ~ ' ;.

l,L--"

Joh . shko Site Vice resident LaSalle County Station

Enclosure:

LaSalle County Nuclear Power Station Annual Radioactive Effluent Release Report (ARERR) for 2020 cc: Regional Administrator - NRC Region Ill NRC Senior Resident Inspector - LaSalle County Station

LASALLE COUNTY NUCLEAR POWER STATION ANNUAL RADIOLOGICAL EFFLUENT RELEASE REPORT (ARERR) 2020 Page I of 74

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2020)

SUPPLEMENT AL INFORMATION I. Regulatory Limits

a. Gaseous Effluents I) 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 IO mrad for beta radiation, and b) During any calendar year: Less than or equal to IO 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 I) 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 I) 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 I) 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 and less 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.

Page 2 of 74

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2020)

SUPPLEMENTAL INFORMATION

b. Liquid Effluents I) The concentration of radioactive material released from the site shall be limited to ten (IO) times the concentrations specified in IO 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 Xe-131m 7.00E-04 Xe-133m 5.00E-04 Xe-133 6.00E-04 Xe-135m 2.00E-04 Xe-135 2.00E-04 Ar-41 7.00E-05

3. Average Energy I) Not applicable - average energy is no longer used to determine dose to the public.
4. Measurements and Approximations of Total Radioactivity
a. Gaseous Effluents I) The Containment Vent and Purge System is sampled by grab sample, which is analyzed for principal gamma emitters and H-3.
2) The Main Vent Stack (Station Vent Stack) is sampled by grab sample, which is analyzed for principal gamma emitters and H-3.
3) Standby Gas Treatment (SBGT) System is sampled by grab sample, which is analyzed for principal gamma emitters.
4) All release types as listed in 4.a. I) and 4.a.2) above are sampled at the Station Vent Stack (SYS)

Wide Range Gas Monitor (WRGM), and those listed in 4.a.3) above are sampled at the Standby Gas Treatment (SBGT) System WRGM 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, Fe-55, Sr-89 and Sr-90. Noble gases, gross beta and gamma are continuously monitored by noble gas monitors for the SVS and the SBGT System.

5) The LaSalle County Station estimate of 17.37 Ci/Unit/yearof C-14 (as total C-14 released) is based upon a normalized C-14 production rate of 5.1 Ci/GWt-yr, a gaseous release fraction of 0.99, a reactor power rating of 3546 MWt (per Unit) and equivalent full power operation of 354 days (per Unit).
b. Liquid Effluents I) Batch waste release tanks are sampled each batch for principal gamma emitters, 1-13 I, dissolved and entrained noble gases, H-3, gross alpha, Sr-89, Sr-90 and Fe-55.

Page 3 of 74

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2020)

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, 1-131, dissolved and entrained noble gases, H-3, gross alpha, Sr-89, Sr-90 and Fe-55.
5. Batch Releases
a. Gaseous I) Number of batch releases: None
2) Total time period for batch releases: NIA
3) Maximum time period for a batch release : NIA
4) Average time period for batch releases: NIA
5) Minimum time period for a batch release: NIA
b. Liquid I) Number of batch releases: None
2) Total time period for batch releases: Min. NIA
3) Maximum time period for a batch release: Min. NIA
4) Average time period for batch releases: Min. NIA
5) Minimum time period for a batch release: Min. NIA
6) Average stream flow during periods of release of effluent into a flowing stream: gpm NIA
6. Abnormal Releases
a. Gaseous I) Number of releases: None
2) Total activity released: NIA
3) Summary ofrelease(s): NIA
b. Liquid I) Number of releases: None
2) Total activity released: NIA
3) Summary ofrelease(s): NIA Page 4 of 74

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2020)

SUPPLEMENT AL INFORMATION

7. Process Control Program There were no changes to the Process Control Program processing systems or components. There was no use of a solidification agent (e.g. cement, urea formaldehyde, etc.) during the processing of solid radioactive waste.
8. Effluent Monitoring Instrumentation time clocks and sample anomalies.
a. Time clocks:

There were no effluent monitoring time clocks exceeded during 2020.

b. Sample anomalies:

There were no sampling anomalies affecting the measurement of effluents experienced during 2020.

9. Offsite Dose Calculation Manual (ODCM) Revisions.

There were no revisions to the LaSalle Station ODCM in 2020 I 0. Independent Spent Fuel Storage Installation (ISFSI).

During the period April I, 2020 to April I, 2021, no radioactive effluents were released from the LaSalle Nuclear Station Independent Spent Fuel Storage Installation (ISFSI). Also, during this period, no casks were transferred to the outdoor concrete ISFSI storage pad.

Page 5 of 74

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2020)

UNIT I AND UNIT 2 DOCKET NUMBERS 50-373 AND 50-374 GASEOUS EFFLUENTS SUMMATION OF ALL RELEASES Est. Total A. Fission & Activation Gases Unit Quarter 1 Quarter 2 Quarter 3 Quarter4 Error %

I. Total Release Ci 1. I 8E+-02 7.58E+-01 3.28E+-O I 2.30E+-OI 2.50E+-OI

2. Average release rate for the period µCi/sec l.50E+-01 9.62E+00 4. 16E+00 2.92E+-O0
3. Percent ofODCM limit  % * * *
  • B. Iodine I. Total Iodine - 131 Ci 2.59E-03 2.12E-03 2.30E-03 l.78E-03 I .50E+-O I I
2. Average release rate for the period µCi/sec 3.28E-04 2.69E-04 2.92E-04 2.26E-04
3. Percent ofODCM limit  % * * *
  • C. Particulates I. Particulates with half-lives > 8 days Ci 6.86E-05 l .52E-04 4.20E-05 <LLD 3.50E+-O I I
2. Average release rate for the period µCi/sec 8.73E-06 1.93E-05 5.28E-06 NIA
3. Percent ofODCM limit  % * * *
  • D. Tritium I. Total Release Ci l.36E+-OI 1.90E+-01 I .69E+-O I 3.68E+-OI I.S0E+-01 I
2. Average release rate for the period µCi /sec 1.73E+-O0 2.41 E+-00 2.14E+O0 4.67E+-O0
3. Percent ofODCM limit  % * * *
  • E. Gross Alpha I. Total Release Ci <LLD <LLD <LLD <LLD NIA I
2. Average release rate for the period µCi/sec <LLD <LLD <LLD <LLD
3. Percent ofODCM limit  % * * *
  • F. Carbon-14 I. Total Release Ci 8.30E+-O0 8.79E+-O0 9.02E+-00 8.93E+-O0
2. Average release rate for the period µCi /sec l.06E+-O0 1.11 E+-00 1.14E+-O0 I. I 3E+-O0
3. Percent ofODCM limit  % * * * *

"*" This information is contained in the Radiological Impact on Man section of the report.

"<" Indicates activity of sample is less than LLD given in µCi /ml Page 6 of 74

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2020)

GASEOUS EFFLUENTS ELEVATED RELEASE UNIT I AND UNIT 2 Nuclides Released Continuous Mode Batch Mode Un er Q 4 11 rter Quarter Quarter Quarter I 2 3 I 2 3 4 A. Fission gases Ar-41 Ci 6.62E-03 <LLD <LLD <LLD NIA NIA NIA NIA Kr-85m Ci 4.97E+0I 3.78E+0l 3.08E 01 l.67 E+0I NIA NIA NIA NIA Kr-88 Ci 3.59E+0I 2.19E+0I 2.00E+ 00 6.3 I E+00 NIA NIA NIA NIA Xe-133 Ci 3.28E+0I 1.61 E+0l <LLD <LLD NIA NIA NIA NIA Ci Ci Ci Ci Ci Ci Total for Period Ci l.18E+02 7.58E+0I 3.28E+0I 2.30E+0I NIA NIA NIA NIA B. Iodines 1-131 Ci 2.59E-03 2.12E-03 2.30E-03 l.78E-03 NIA NIA NIA NIA 1-133 Ci 6.30E-03 8.0SE-03 9.46E-03 7.28E-03 NIA NIA NIA NIA 1-135 Ci 7.85E-04 3.81 E-03 3.38E-03 3.19E-03 NIA NIA NIA NIA Ci Ci Total for Period Ci 9.67E-03 I .40E-02 I .5 IE-02 I .22E-02 NIA NIA NIA NIA C. Particulates Co-60 Ci 6.86E-05 6.06E-05 4.20E-05 <LLD NIA NIA NIA NIA Ba-140 Ci <LLD 9.I SE-05 <LLD <LLD NIA NIA NIA NIA Ci Ci Ci Ci Ci Ci Ci Ci Ci Ci Ci Ci Ci Ci Ci Ci Ci Total for Period Ci 6.86E-05 l.52E-04 4.20E-05 <LLD NIA NIA NIA NIA D. Tritium Ci l.36E+0I l.90E+0I l.69E+0I 3.68E+0I NIA NIA NIA NIA E. Gross Alpha Ci <LLD <LLD <LLD <LLD NIA I NIA I NIA II NIA I F. Carbon-14 Ci 8.30E+00 8.79E+00 9.02E+00 8.93E+00 NIA NIA NIA NIA Note: Only nuclides with positive activity are reported.

Page 7 of 74

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2020)

LIQUID RELEASES UNIT I AND UNIT 2 SUMMATION OF ALL LIQUID RELEASES Est. Total A. Fission & Activation Products Unit Quarter 1 Quarter2 Quarter 3 Quarter4 Error %

1. Total Release (not including tritium, gases &

alpha)

Ci <LLD <LLD <LLD <LLD NIA

2. Average diluted concentration during period µC i/mL <LLD <LLD <LLD <LLD
3. Percent of applicable lim it  % * * *
1. Total Release Ci <LLD <LLD <LLD <LLD NIA I
2. Average diluted concentration during period µCi /mL <LLD <LLD <LLD <LLD
3. Percent of applicable limit  % * * *
  • C. Dissolved & Entrained Gases
1. Total Release Ci <LLD <LLD <LLD <LLD NIA I
2. Average diluted concentration during period µCi/ mL <LLD <LLD <LLD <LLD
3. Percent of applicable limit  % * * *
  • D. Gross Alpha Activity I. Total Release Ci <LLD <LLD <LLD <LLD NIA I
2. Average release rate for the period µCi /mL <LLD <LLD <LLD <LLD
3. Percent ofODCM limit  % * * *
  • E. Volume of Waste Released (prior to Liters O.OOE+oO O.OOE+oO O.OOE+OO O.OOE+oO dilution)

F. Volume of Dilution Water Used During Liters O.OOE+oO O.OOE+OO O.OOE+oO O.OOE+oO Period

"*" This infonnation is contained in the Radiological Impact on Man section of the report.

"<" Indicates activity of sample is less than LLD given in µCi /ml Page 8 of 74

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2020)

LIQUID RELEASES UNIT I AND UNIT 2 I Nuclides Released I I Continuous Mode Batch Mode A. Fission & Actintion Quarter Quarter Quarter Quarter Quarter Quarter Quarter Quarter Unit Products I 2 3 4 I 2 3 4 None Ci NIA NIA NIA NIA NIA NIA NIA NIA Ci Ci Ci Ci Ci Ci Ci Ci Ci Ci Ci Ci Ci Total for Period Ci B.H-3 H-3 Total for Period Ci NIA NIA NIA NIA NIA NIA NIA C. Dissolved &

Entrained Gasses None Ci NIA NIA NIA NIA NIA NIA NIA NIA Ci Ci Ci Ci Ci Ci Ci Ci Ci Total for Period Ci D. Gross Alpha Gross Alpha Total for Ci NIA NIA NIA NIA NIA NIA NIA NIA Period Page 9 of 74

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2020)

SOLID WASTE AND IRRADIATED FUEL SHIPMENTS A. Solid Waste Shipped Offsite for Burial or Disposal (Not irradiated fuel)

Resins, Filters, and Evaporator Bottoms Summary for the LaSalle Site Waste Volume Curies  % Error Class ft 3 m3 Shipped (Activity)

A l.8IE+03 5.13E+0I 3.47E+02 +/-25%

B 0.00E+00 0.00E+00 0.00E+00 +/-25%

C 0.00E+00 0.00E+00 0.00E+00 +/-25%

Unclassified 0.00E+00 0.00E+00 0.00E+00 +/-25%

All l.81E+03 5.13E+0I 3.47E+02 +/-25%

Major Nuclides for Above Table:

H-3, C-14, Fe-55, Co-60, Ni-63, Sr-90, Tc-99, Ru-106, 1-129, Cs-137, Pu-238, Pu-239, Pu-241, Am-241 Resins, Filters and Evaporator Bottoms Waste Class A Nuclide Name Percent Abundance Curies C-14 1.16% 4.04E+00 Fe-55 18.09% 6.29E+0I Co-60 78.29% 2.72E+02 Ni-63 1.18% 4.09E+00 Resins, Filters and Evaporator Bottoms Waste Class B Nuclide Name Percent Abundance Curies None NIA NIA Resins, Filters and Evaporator Bottoms Waste Class C Nuclide Name Percent Abundance Curies None NIA NIA Page 10 of 74

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2020)

SOLID WASTE AND IRRADIATED FUEL SHIPMENTS Dry Active Waste (DAW) Summary for the LaSalle Site Waste Volume Curies  % Error Class ft 3 mJ Shipped (Activity)

A 3.59E+04 l.02E+03 2.22E+00 +l-25%

B 0.00E+00 0.00E+00 0.00E+00 +l-25%

C 0.00E+00 0.00E+00 0.00E+00 +l-25%

Unclassified 0.00E+00 0.00E+00 0.00E+00 +l-25%

All 3.59E+04 l.02E+03 2.22E+00 +l-25%

Major Nuclides for Above Table:

H-3, C-14, Fe-55, Co-60, Ni-63, Sr-90, Tc-99, 1-129, Cs-137, Pu-239, Pu-241, Am-241, Cm-242, Cm-244 DAW Waste Class A Nuclide Name Percent Abundance Curies Fe-55 12.54% 2.78E+0I Co-60 85.66% l.90E+00 DAW Waste Class B Nuclide Name Percent Abundance Curies None NIA NIA DAW Waste Class C Nuclide Name Percent Abundance Curies None NIA NIA Page 11 of 74

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2020)

SOLID WASTE AND IRRADIATED FUEL SHIPMENTS Irradiated Components Summary for the LaSalle Site Waste Volume Curies  % Error Class rt3 mJ Shipped (Activity)

A 0.00E+00 0.00E+00 0.00E+00 +l-25%

B 0.00E+00 0.00E+00 0.00E+00 +l-25%

C 0.00E+00 0.00E+00 0.00E+00 +l-25%

Unclassified 0.00E+00 0.00E+00 0.00E+00 +l-25%

All 0.00E+00 0.00E+00 0.00E+00 +l-25%

Major Nuclides for Above Table:

Irradiated Components Waste Class A Nuclide Name Percent Abundance Curies None NIA NIA Irradiated Components Waste Class B Nuclide Name Percent Abundance Curies None NIA NIA Irradiated Components Waste Class C Nuclide Name Percent Abundance Curies None NIA NIA Page 12 of 74

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2020)

SOLID WASTE AND IRRADIATED FUEL SHIPMENTS Other Waste Summary for the LaSalle Site Waste Volume Curies  % Error Class ft 3 mJ Shinned (Activity)

A 2.55E+02 7.22E+00 2.69E-03 +l-25%

8 0.00E+00 0.00E+00 O.00E+00 +l-25%

C 0.00E+00 0.00E 00 O.00E+00 +l-25%

Unclassified 0.00E+00 0.00E+00 0.00E+00 +l-25%

All 2.55E+02 7.22E+00 2.69E-03 +l-25%

Major Nuclides for Above Table:

H-3, C-14, Fe-55, Co-60, Ni-63, Sr-90, Tc-99, 1-129, Cs-137, Am-241, Cm-242, Cm-244 Other Waste Waste Class A Nuclide Name Percent Abundance Curies H-3 16.7% 4.S0E-04 Fe-55 7.39% l.99E-04 Co-60 72.75% I.96E-03 Cs-137 1.2% 3.23E-05 Other Waste Waste Class B Nuclide Name Percent Abundance Curies None NIA NIA Other Waste Waste Class C Nuclide Name Percent Abundance Curies None NIA NIA Page 13 of 74

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2020)

SOLID WASTE AND IRRADIATED FUEL SHIPMENTS Sum of All Low-Level Waste Shipped from the LaSalle Site Waste Volume Curies  % Error Class ft3 mJ Shipped (Activity)

A 3.80E+04 l.07E+03 3.50E+02 +l-25%

B 0.00E+00 0.00E+00 0.00E+00 +l-25%

C 0.00E+00 0.00E+00 0.00E+00 +l-25%

Unclassified 0.00E+00 0.00E+00 0.00E+00 +l-25%

All 3.80E+04 l.07E+03 3.50E+02 +l-25%

Major Nuclides for Above Table:

H-3, C-14, Co-60, Ni-63, Sr-90, Tc-99, Ru-106, 1-129, Cs-137, Am-241, Cm-242, Cm-244 Waste Stream; Sum of All Four Categories Waste Class A Nuclide Name Percent Abundance Curies C-14 1.16% 4.04E+00 Fe-55 18.06% 6.32E+0I Co-60 78.33% 2.74E+02 Ni-63 1.17% 4. I0E+00 Waste Stream; Sum of All Four Categories Waste Class B Nuclide Name Percent Abundance Curies None NIA NIA Waste Stream; Sum of All Four Categories Waste Class C Nuclide Name Percent Abundance Curies None NIA NIA Page 14 of 74

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2020)

SOLID WASTE AND IRRADIATED FUEL SHIPMENTS Solid Waste Disposition Number of Shipments Mode of Transportation Destination I Hittman Transport Energy Solutions - Bear Creek Facility, Oak Ridge, TN 23 Hittman Transport Energy Solutions - Bear Creek Facility, Oak Ridge, TN 12 Hittman Transport Energy Solutions LLC Containerized Waste Facility Page 15 of74

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2020)

RADIOLOGICAL IMPACT ON MAN MAXIMUM DOSES RESULTING FROM GASEOUS RELEASES AND COMPLIANCE STATUS Quarterly 1st 2nd 3rd 4th Annual Annual Units All Age Groups Limit Quarter Quarter Quarter Quarter Limit Gamma Air 5.00E+00 mRad 1.27E-03 7.88E-04 1.24E-04 2.36E-04 I.00E+0I 2.42E-03

% of Limit  % 2.53E-02 1.SSE-02 2.49E-03 4.73E-03  % 2.42E-02 Beta Air I.00E+0I mRad 6.38E-05 4.17E-05 1.78E-05 1.38E-05 2.00E+0I 1.37E-04

% of Limit  % 6.38E-04 4.17E-04 1.78E-04 1.38E-04  % 6.86E-04 NG Total Body 2.50E+O0 mRem 8.46E-04 5.26E-04 8.34E-05 1.58E-04 5.00E+00 I.61E-03

% of Limit  % 3.38E-02 2.lOE-02 3.34E-03 6.31E-03  % 3.22E-02 NG Skin 7.50E+00 mRem 1.43E-03 8.88E-04 1.47E-04 2.68E-04 l.50E+0I 2.73E-03

% of Limit  % 1.90E-02 1.18E-02 1.95E-03 3.57E-03 I .82E-02 NNG Organ 7.50E+00 mRem 1.39E-02 1.19E-02 1.28E-02 1.03E-02 l.50E+0I 4.887E-02 Infant Thyroid  % of Limit  % 1.SSE-01 1.58E-01 1.71E-01 1.37E-01  % 3.258E-0I The LaSalle County Nuclear Power Station maximum expected annual dose from Carbon-14 has been calculated using th.: maximum gross thermal capacity at lull power operation. The resultant bounding doses are based upon s ite specific assumptions of source term .

Page 16 of74

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2020)

RADIOLOGICAL IMPACT ON MAN MAXIMUM DOSES RESULTING FROM LIQUID RELEASES AND COMPLIANCE STATUS Quarterly 1st %of 2nd %of 3rd %of 4th %of Annual %of Units Infant Rece~tor Limit Quarter Limit Quarter Limit Quarter Limit Quarter Limit Limit Limit I0CFRS0 Appendix I compliance Total Body 1.50E+00 mRem 0.0OE+00 0.00 0.00E+00 0.00 0.00E+00 0.00 0.00E+00 0.00 3.00E+00 0.00 Organ 5.00E+OO mRem 0.00E+0O 0.00 0.00E+O0 0.00 0.00E+0O 0.00 O.OOE+00 0.00 I.00E+0I 0.00 40CFRl41 compliance (nearest public drinking water)

Total Body mRem 0.00E+00 0.00E+00 0.00E+00 0.00E+00 4.00E+00 0.00 Organ mRem 0.00E+00 0.00E+00 0.00E+00 0.00E+00 4.00E+00 0.00 Quarterly 1st %of 2nd %of 3rd %of 4th %of Annual %of Units Child Rece~tor Limit Quarter Limit Quarter Limit Quarter Limit Quarter Limit Limit Limit I0CFRS0 Appendix I compliance Total Body 1.50E+00 mRem 0.00E+00 0.00 0.00E+00 0.00 0.00E+00 0.00 0.00E+00 0.00 3.00E+00 0.00 Organ 5.00E+00 mRem 0.00E+00 0.00 0.00E+00 0.00 0.0OE+00 0.00 0.00E+00 0.00 I.00E+0I 0.00 40CFRl41 compliance (nearest public drinking water)

Total Body mRem 0.00E+00 0.00E+00 0.00E+00 0.00E+00 4.00E+00 0.00 Organ mRem 0.00E+00 0.00E+00 0.00E+00 0.00E+00 4.00E+00 0.00

%of 2nd %of 3rd %of 4th %of Annual %of Teenager Quarterly 1st Units Rece~tor Limit Quarter Limit Quarter Limit Quarter Limit Quarter Limit Limit Limit I0CFRS0 Appendix I compliance Total Body 1.50E+00 mRem 0.00E+00 0.00 0.00E+00 0.00 0.00E+00 0.00 0.00E+00 0.00 3.00E+00 0.00 Organ 5.00E+00 mRem 0.00E+00 0.00 0.00E+00 0.00 0.00E+00 0.00 0.00E+00 0.00 I.00E+0I 0.00 40CFRl41 compliance (nearest public drinking water)

Total Body mRem O.0OE+0O O.0OE+OO 0.00E+0O 0.00E+0O 4.00E+0O 0.00 Organ mRem 0.00E+00 0.00E+00 0.00E+00 0.00E+00 4.00E+00 0.00

%of 2nd %of 3rd %of 4th %of Annual %of Quarterly 1st Units Limit Adult Rece~tor Limit Quarter Limit Quarter Limit Quarter Limit Quarter Limit Limit I0CFRS0 Appendix I compliance Total Body l.50E+O0 mRem 0.00E+00 0.00 0.00E+00 0.00 0.00E+00 0.00 0.00E+00 . 0.00 3.00E+00 0.00 Organ 5.00E+00 mRem 0.00E+00 0.00 0.00E+00 0.00 0.00E+00 0.00 0.00E+00 0.00 I.00E+OI 0.00 40CFRl41 compliance (nearest public drinking water)

Total Body mRem 0.00E+00 0.00E+00 0.00E+00 0.00E+00 4.00E+00 0.00 Organ mRem O.O0E+0O 0.0OE+0O 0.O0E+0O O.00E+0O 4.00E+00 0.00 Page 17 of 74

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2019)

RADIOLOGICAL IMPACT ON MAN MAXIMUM DOSES RESULTING FROM RELEASES AND COMPLIANCE STATUS 10CFR20 / 40CFR190 Compliance 2nd 3rd I" Quarter Quarter Quarter 4th Quarter Annual Annual  % Annual Dose Dose Dose Dose Dose Limit Limit (mRem) (mRem) (mRem) (mRem) (mRem) (mRem/yr)

Unit 1 40CFR 190 Compliance u1 DE' 8.30E-02 l.03E-0I 9.68E-02 4.37E-02 3.26E-0I 25 1.30 I 0CFR20 Compliance UI oroi 9.68E-02 l.15E-0I I.JOE-OJ 5.40E-02 3.75E-0I 100 0.37 40CFR 190 Compliance Bone 6.50E-03 7.13E-03 7.31 E-03 7.23E-03 2.82E-02 25 0.11 Liver l.43E-03 l .56E-03 I .60E-03 l.58E-03 6.18E-03 25 0.02 Thyroid I .39E-02 l.19E-02 l.28E-02 1.03E-02 4.88E-02 75 0.07 Kidney l.44E-03 I .57E-03 1.61 E-03 l.59E-03 6.20E-03 25 0.02 Lung I .39E-03 I .53E-03 l.57E-03 I .56E-03 6.04E-03 25 0.02 GI-LLI l.39E-03 I .53E-03 l.57E-03 I .56E-03 6.05E-03 25 0.02 Unit 2 40CFR 190 Compliance U2 oEx I 9.80E-02 9.68E-02 9.63E-02 6.94E-02 3.60E-0I 25 1.44 I 0CFR20 Compliance U2 oroi 9.80E-02 9.68E-02 9.63E-02 6.94E-02 3.60E-0I 100 0.36 40CFR 190 Compliance Bone 0.0OE+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 25 0.00 Liver 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 25 0.00 Thyroid 0.0OE+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 75 0.00 Kidney 0.0OE+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 25 0.00 Lung O.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 25 0.00 GI-LL! O.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 25 0.00 Page 18 of 74

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2020)

METEOROLOGICAL DATA LaSalle County Generating Station Period of Record: January - March 2020 Stability Class - Extremely 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 0 0 0 0 0 0 NNE 0 0 0 0 0 0 0 NE 0 0 0 0 0 0 0 ENE 0 0 0 0 0 0 0 E 0 0 0 0 0 0 0 ESE 0 0 0 0 0 0 0 SE 0 0 0 0 0 0 0 SSE 0 0 0 0 0 0 0 s 0 0 1 3 0 0 4 SSW 0 0 0 0 1 0 1 SW 0 0 0 1 0 0 1 WSW 0 0 0 0 0 0 0 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 1 4 1 0 6 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 5 Page 19 of 74

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2020)

METEOROLOGICAL DATA LaSalle County Generating Station Period of Record: January - March 2020 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 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 2 0 0 2 SSW 0 0 0 2 2 0 4 SW 0 0 3 9 0 1 13 WSW 0 0 1 0 0 0 1 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 4 13 2 1 20 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes : 5 Page 20 of 74

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2020)

METEOROLOGICAL DATA LaSalle County Generating Station Period of Record: January - March 2020 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 0 0 0 0 0 0 NNE 0 0 0 1 0 0 1 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 2 0 0 2 SSW 0 0 0 1 2 0 3 SW 0 1 3 3 1 0 8 WSW 0 0 2 1 1 0 4 w 0 0 0 2 0 0 2 WNW 0 0 2 4 1 0 7 NW 0 0 1 3 1 0 5 NNW 0 0 1 5 1 0 7 Variable 0 0 0 0 0 0 0 Total 0 1 9 22 7 0 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: 5 Page 21 of 74

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2020)

METEOROLOGICAL DATA LaSalle County Generating Station Period of Record: January - March 2020 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 2 18 54 21 0 0 95 NNE 0 15 63 31 0 0 109 NE 0 9 21 17 0 0 47 ENE 1 3 22 13 0 0 39 E 1 3 17 11 3 0 35 ESE 0 2 7 12 2 1 24 SE 2 5 12 8 3 0 30 SSE 6 8 16 10 2 1 43 s 2 12 13 14 7 0 48 SSW 4 10 12 15 8 1 50 SW 2 11 8 13 1 0 35 WSW 3 19 27 5 1 6 61 w 4 20 43 42 12 3 124 WNW 0 28 53 43 34 1 159 NW 0 18 30 29 2 0 79 NNW 2 20 63 45 15 4 149 Variable 0 0 0 0 0 0 0 Total 29 201 461 329 90 17 1127 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 5 Page 22 of 74

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2020)

METEOROLOGICAL DATA LaSalle County Generating Station Period of Record: January - March 2020 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 2 11 0 0 0 0 13 NNE 0 6 4 0 0 0 10 NE 1 1 13 3 0 0 18 ENE 0 3 21 5 0 0 29 E 2 18 55 9 0 0 84 ESE 1 8 14 12 0 0 35 SE 2 15 9 8 2 0 36 SSE 0 19 8 8 4 0 39 s 3 12 18 25 14 0 72 SSW 5 7 11 32 26 1 82 SW 2 11 13 23 10 1 60 WSW 1 12 27 8 7 1 56 w 1 13 26 16 7 14 77 WNW 2 16 35 15 12 7 87 NW 0 5 17 0 0 0 22 NNW 2 6 4 0 0 0 12 Variable 0 0 0 0 0 0 0 Total 24 163 275 164 82 24 732 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes : 5 Page 23 of 74

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2020)

METEOROLOGICAL DATA LaSalle County Generating Station Period of Record: January - March 2020 Stability Class - Moderately 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 1 0 0 0 0 1 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 4 7 0 0 0 11 ESE 0 8 1 0 0 0 9 SE 0 9 0 0 0 0 9 SSE 1 8 14 5 0 0 28 s 0 9 7 15 1 0 32 SSW 0 8 10 9 0 0 27 SW 0 1 11 4 0 0 16 WSW 0 5 8 4 1 0 18 w 0 6 6 1 0 0 13 WNW 0 8 4 0 0 0 12 NW 0 2 1 0 0 0 3 NNW 1 0 0 0 0 0 1 Variable 0 0 0 0 0 0 0 Total 2 69 69 38 2 0 180 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 5 Page 24 of74

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2020)

METEOROLOGICAL DATA LaSalle County Generating Station Period of Record: January - March 2020 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 1 0 0 0 0 1 ESE 0 3 0 0 0 0 3 SE 0 1 0 0 0 0 1 SSE 1 2 6 0 0 0 9 s 0 1 4 0 0 0 5 SSW 0 3 6 0 0 0 9 SW 0 3 9 0 0 0 12 WSW 0 2 11 1 0 0 14 w 1 6 3 2 0 0 12 WNW 0 5 3 0 0 0 8 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 2 28 42 3 0 0 75 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 5 Page 25 of 74

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2020)

METEOROLOGICAL DATA LaSalle County Generating Station Period of Record: January - March 2020 Stability Class - Extremely 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 1 0 0 1 SW 0 0 0 0 0 0 0 WSW 0 0 0 0 0 0 0 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 0 0 1 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 5 Page 26 of 74

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2020)

METEOROLOGICAL DATA LaSalle County Generating Station Period of Record: January - March 2020 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 0 0 0 SW 0 0 0 0 0 0 0 WSW 0 0 0 0 0 0 0 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 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: 5 Page 27 of 74

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2020)

METEOROLOGICAL DATA LaSalle County Generating Station Period of Record: January - March 2020 Stability Class - Slightly 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 2 1 0 3 SSW 0 0 0 0 0 2 2 SW 0 0 0 3 0 0 3 WSW 0 0 0 0 0 0 0 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 5 1 2 8 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 5 Page 28 of 74

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2020)

METEOROLOGICAL DAT A LaSalle County Generating Station Period of Record: January - March 2020 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 1 15 27 41 21 1 106 NNE 1 4 19 45 55 5 129 NE 2 3 9 41 15 0 70 ENE 2 2 9 25 11 0 49 E 0 1 12 21 5 3 42 ESE 0 4 10 12 16 4 46 SE 1 5 5 8 10 2 31 SSE 1 6 6 20 12 5 50 s 2 10 13 18 12 13 68 SSW 1 7 10 8 16 19 61 SW 1 6 16 8 14 7 52 WSW 1 7 23 19 5 9 64 w 3 11 20 42 35 14 125 WNW 1 7 27 21 35 30 121 NW 0 14 63 39 43 15 174 NNW 0 7 23 43 24 18 115 Variable 0 0 0 0 0 0 0 Total 17 109 292 411 329 145 1303 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class : 1 Hours of missing stability measurements in all stability classes: 5 Page 29 of 74

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2020)

METEOROLOGICAL DAT A LaSalle County Generating Station Period of Record: January - March 2020 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 0 0 0 3 3 0 6 NNE 1 1 3 1 1 0 7 NE 0 2 3 3 3 0 11 ENE 0 0 2 9 7 0 18 E 0 1 3 27 4 1 36 ESE 0 1 6 23 12 6 48 SE 2 2 9 11 15 3 42 SSE 1 7 12 3 3 6 32 s 0 7 21 14 17 28 87 SSW 2 6 7 15 14 55 99 SW 1 1 11 9 16 32 70 WSW 1 3 5 18 12 9 48 w 3 3 8 26 6 13 59 WNW 1 4 9 17 10 46 87 NW 0 2 20 26 6 4 58 NNW 0 4 5 7 3 0 19 Variable 0 0 0 0 0 0 0 Total 12 44 124 212 132 203 727 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 5 Page 30 of 74

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2020)

METEOROLOGICAL DATA LaSalle County Generating Station Period of Record: January - March 2020 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 1 1 2 1 2 0 7 NNE 0 2 0 0 0 0 2 NE 0 0 0 0 0 0 0 ENE 0 0 0 0 0 0 0 E 0 0 0 0 0 0 0 ESE 0 1 0 6 0 0 7 SE 0 0 4 5 0 0 9 SSE 0 0 0 5 2 0 7 s 0 0 1 4 7 7 19 SSW 0 0 0 1 3 6 10 SW 0 1 9 5 6 1 22 WSW 0 0 2 4 3 1 10 w 0 0 4 3 7 0 14 WNW 0 0 3 4 2 1 10 NW 0 1 6 2 1 0 10 NNW 0 1 1 0 0 0 2 Variable 0 0 0 0 0 0 0 Total 1 7 32 40 33 16 129 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class : 0 Hours of missing stability measurements in all stability classes: 5 Page 31 of 74

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2020)

METEOROLOGICAL DAT A LaSalle County Generating Station Period of Record: January - March 2020 Stability Class - Extremely 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 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 1 1 s 0 0 0 0 0 1 1 SSW 0 0 0 0 0 0 0 SW 0 1 2 1 0 0 4 WSW 0 0 0 3 0 0 3 w 0 1 0 0 0 0 1 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 2 2 4 0 2 10 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class : 0 Hours of missing stability measurements in all stability classes : 5 Page 32 of 74

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2020)

METEOROLOGICAL DATA LaSalle County Generating Station Period of Record: April - June 2020 Stability Class - Extremely 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 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 1 0 0 0 1 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 1 0 1 s 0 0 0 1 0 0 1 SSW 0 0 2 0 0 0 2 SW 0 0 1 2 4 0 7 WSW 0 0 0 0 1 0 1 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 4 3 6 0 13 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 33 of74

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2020)

METEOROLOGICAL DATA LaSalle County Generating Station Period of Record: April - June 2020 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 0 0 0 2 0 0 2 NNE 0 0 0 1 0 0 1 NE 0 0 5 1 0 0 6 ENE 0 0 5 2 0 0 7 E 0 0 3 2 0 0 5 ESE 0 0 1 0 0 0 1 SE 0 0 0 2 1 0 3 SSE 0 0 0 0 3 0 3 s 0 0 0 2 0 0 2 SSW 0 0 0 3 1 0 4 SW 0 0 3 6 1 0 10 WSW 0 0 5 4 5 0 14 w 0 0 4 9 0 0 13 WNW 0 0 0 11 3 0 14 NW 0 0 0 0 0 0 0 NNW 0 0 0 1 1 0 2 Variable 0 0 0 0 0 0 0 Total 0 0 26 46 15 0 87 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 3 Page 34 of 74

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2020)

METEOROLOGICAL DATA LaSalle County Generating Station Period of Record: April - June 2020 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 0 1 1 0 0 2 NNE 0 1 2 0 0 0 3 NE 0 1 7 1 0 0 9 ENE 0 1 4 3 0 0 8 E 0 0 6 5 0 0 11 ESE 0 0 2 3 0 1 6 SE 0 1 7 4 1 0 13 SSE 0 0 5 7 3 0 15 s 0 0 8 2 0 0 10 SSW 0 1 11 3 2 0 17 SW 0 5 8 5 0 1 19 WSW 0 1 8 4 3 0 16 w 0 5 13 7 4 0 29 WNW 0 1 7 11 3 0 22 NW 0 2 2 7 1 0 12 NNW 0 1 3 5 0 0 9 Variable 0 0 0 0 0 0 0 Total 0 20 94 68 17 2 201 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 35 of 74

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2020)

METEOROLOGICAL DATA LaSalle County Generating Station Period of Record: April - June 2020 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 1 18 27 2 1 0 49 NNE 0 24 40 11 0 0 75 NE 0 11 45 28 0 0 84 ENE 0 13 16 31 0 0 60 E 0 7 26 21 0 0 54 ESE 0 6 14 16 2 1 39 SE 1 15 27 5 3 3 54 SSE 0 9 18 19 8 1 55 s 2 15 20 9 2 1 49 SSW 2 12 17 7 4 0 42 SW 0 8 19 7 9 1 44 WSW 3 14 16 8 5 1 47 w 0 12 26 11 11 2 62 WNW 1 14 34 27 14 9 99 NW 0 7 17 12 13 2 51 NNW 0 10 36 33 15 3 97 Variable 0 0 0 0 0 0 0 Total 10 195 398 247 87 24 961 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 36 of 74

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2020)

METEOROLOGICAL DATA LaSalle County Generating Station Period of Record: April - June 2020 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 2 12 7 0 0 0 21 NNE 0 5 6 0 0 0 11 NE 1 3 3 0 0 0 7 ENE 0 5 21 5 0 0 31 E 2 15 36 3 0 0 56 ESE 1 5 11 4 0 0 21 SE 3 12 3 1 0 0 19 SSE 5 14 14 6 0 0 39 s 1 9 12 8 1 0 31 SSW 2 14 15 14 2 1 48 SW 2 5 17 25 2 1 52 WSW 1 10 24 15 0 0 50 w 5 10 25 10 0 0 50 WNW 1 10 14 18 1 1 45 NW 2 7 6 2 0 0 17 NNW 1 6 11 0 0 0 18 Variable 0 0 0 0 0 0 0 Total 29 142 225 111 6 3 516 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 37 of 74

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2020)

METEOROLOGICAL DATA LaSalle County Generating Station Period of Record: April - June 2020 Stability Class - Moderately 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 1 0 0 0 0 1 NE 0 1 0 0 0 0 1 ENE 0 3 2 0 0 0 5 E 2 21 16 0 0 0 39 ESE 1 15 10 0 0 0 26 SE 0 9 12 0 0 0 21 SSE 1 16 9 0 0 0 26 s 1 10 0 2 0 0 13 SSW 0 10 7 11 0 0 28 SW 2 10 9 4 0 0 25 WSW 1 12 20 1 0 0 34 w 1 12 28 0 0 0 41 WNW 0 18 3 0 0 0 21 NW 2 0 0 0 0 0 2 NNW 1 3 0 0 0 0 4 Variable 0 0 0 0 0 0 0 Total 12 141 116 18 *O 0 287 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 38 of 74

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2020)

METEOROLOGICAL DATA LaSalle County Generating Station Period of Record: April - June 2020 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 1 0 0 0 0 1 E 0 10 4 0 0 0 14 ESE 0 16 3 0 0 0 19 SE 1 14 3 0 0 0 18 SSE 0 18 1 0 0 0 19 s 0 8 2 0 0 0 10 SSW 0 3 3 0 0 0 6 SW 0 4 2 0 0 0 6 WSW 0 5 5 0 0 0 10 w 1 3 4 0 0 0 8 WNW 0 3 0 0 0 0 3 NW 2 0 0 0 0 0 2 NNW 0 0 0 0 0 0 0 Variable 0 0 0 0 0 0 0 Total 4 85 27 0 0 0 116 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 3 Page 39 of 74

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2020)

METEOROLOGICAL DATA LaSalle County Generating Station Period of Record: April - June 2020 Stability Class - Extremely 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 0 0 0 SW 0 0 0 0 0 0 0 WSW 0 0 0 0 0 0 0 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 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: 3 Page 40 of 74

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2020)

METEOROLOGICAL DATA LaSalle County Generating Station Period of Record: April - June 2020 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 1 0 0 0 1 ENE 0 0 0 0 0 0 0 E 0 0 0 0 0 0 0 ESE 0 0 0 0 0 0 0 SE 0 0 0 0 0 0 0 SSE 0 0 0 0 0 0 0 s 0 0 0 0 0 0 0 SSW 0 0 0 0 0 0 0 SW 0 0 0 0 0 2 2 WSW 0 0 0 0 0 0 0 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 1 0 0 2 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: 3 Page 41 of 74

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2020)

METEOROLOGICAL DATA LaSalle County Generating Station Period of Record: April - June 2020 Stability Class - Slightly 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 3 1 4 NNE 0 0 0 0 2 0 2 NE 0 0 2 2 1 0 5 ENE 0 0 0 4 1 0 5 E 0 0 1 3 0 0 4 ESE 0 0 0 0 0 0 0 SE 0 0 0 0 2 0 2 SSE 0 0 1 0 1 1 3 s 0 0 0 0 1 0 1 SSW 0 0 1 0 2 0 3 SW 0 0 1 3 3 2 9 WSW 0 0 0 1 2 1 4 w 0 0 0 2 1 0 3 WNW 0 0 0 3 1 0 4 NW 0 0 0 0 1 0 1 NNW 0 0 0 0 0 0 0 Variable 0 0 0 0 0 0 0 Total 0 0 6 18 21 5 50 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 42 of 74

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2020)

METEOROLOGICAL DAT A LaSalle County Generating Station Period of Record: April - June 2020 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 10 16 21 5 5 57 NNE 0 7 13 23 19 7 69 NE 0 9 16 39 27 0 91 ENE 0 14 10 32 38 1 95 E 0 3 14 39 17 1 74 ESE 0 5 11 19 7 0 42 SE 1 12 28 13 12 4 70 SSE 0 13 16 28 19 8 84 s 0 7 19 26 15 4* 71 SSW 5 10 16 26 5 11 73 SW 0 8 16 22 9 12 67 WSW 1 6 24 24 12 8 75 w 0 12 16 25 13 13 79 WNW 1 11 15 42 27 20 116 NW 0 6 21 40 25 26 118 NNW 0 2 12 37 19 17 87 Variable 0 0 0 0 0 0 0 Total 8 135 263 456 269 137 1268 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 43 of74

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2020)

METEOROLOGICAL DATA LaSalle County Generating Station Period of Record: April - June 2020 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 0 1 5 6 12 1 25 NNE 0 1 7 5 0 0 13 NE 0 2 5 4 0 0 11 ENE 0 1 4 14 3 0 22 E 0 0 7 22 8 0 37 ESE 0 1 7 24 11 0 43 SE 0 5 11 11 16 1 44 SSE 1 5 6 13 7 4 36 s 0 4 7 16 10 6 43 SSW 1 3 11 13 6 14 48 SW 0 6 14 21 20 22 83 WSW 0 1 10 15 11 7 44 w 1 2 14 21 27 5 70 WNW 0 3 7 27 14 10 61 NW 1 4 12 18 9 7 51 NNW 1 4 3 5 0 1 14 Variable 0 0 0 0 0 0 0 Total 5 43 130 235 154 78 645 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 44 of 74

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2020)

METEOROLOGICAL DATA LaSalle County Generating Station Period of Record: April - June 2020 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 0 0 0 0 NNE 0 0 0 2 0 0 2 NE 0 l l 0 0 0 2 ENE 0 0 0 0 0 0 0 E 0 2 0 6 0 0 8 ESE 0 0 3 5 3 0 11 SE l 1 7 27 7 0 43 SSE 0 1 2 12 6 0 21 s 0 6 5 6 0 0 17 SSW 0 1 5 9 3 3 21 SW 0 2 8 4 1 1 16 WSW 1 0 6 2 0 0 9 w 0 2 1 5 12 0 20 WNW 1 0 2 2 8 3 16 NW 0 1 4 4 0 0 9 NNW 0 2 0 3 0 0 5 Variable 0 0 0 0 0 0 0 Total 3 19 44 87 40 7 200 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 74

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2020)

METEOROLOGICAL DATA LaSalle County Generating Station Period of Record: April - June 2020 Stability Class - Extremely 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 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 3 1 0 0 4 SSE 0 0 0 6 0 0 6 s 0 0 0 2 0 0 2 SSW 0 0 0 1 1 0 2 SW 0 0 0 0 0 0 0 WSW 0 0 0 0 0 0 0 w 0 0 1 0 0 0 1 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 4 10 1 0 15 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 46 of 74

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2020)

METEOROLOGICAL DAT A LaSalle County Generating Station .

Period of Record: July - September 2020 Stability Class - Extremely 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 0 0 0 0 0 0 NNE 0 0 0 0 0 0 0 NE 0 0 0 0 0 0 0 ENE 0 0 0 0 0 0 0 E 0 0 0 0 0 0 0 ESE 0 0 0 0 0 0 0 SE 0 0 0 0 0 0 0 SSE 0 0 0 0 0 0 0 s 0 0 1 0 0 0 1 SSW 0 0 3 0 0 0 3 SW 0 0 5 3 1 0 9 WSW 0 1 5 2 0 0 8 w 0 0 3 0 0 0 3 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 1 17 5 1 0 24 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 47 of 74

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2020)

METEOROLOGICAL DATA LaSalle County Generating Station Period of Record: July - September 2020 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 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 5 0 0 0 5 E 0 0 1 0 0 0 1 ESE 0 0 2 0 0 0 2 SE 0 0 0 0 0 0 0 SSE 0 2 3 2 0 0 7 s 0 3 5 5 0 0 13 SSW 0 3 19 0 0 0 22 SW 0 3 6 4 0 0 13 WSW 0 5 12 3 1 0 21 w 0 5 8 3 0 0 16 WNW 0 1 0 5 0 0 6 NW 0 0 0 2 0 0 2 NNW 0 0 0 1 0 0 1 Variable 0 0 0 0 0 0 0 Total 0 22 61 25 1 0 109 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 48 of 74

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2020)

METEOROLOGICAL DATA LaSalle County Generating Station Period of Record: July - September 2020 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 1 2 0 0 0 3 NNE 0 2 1 0 0 0 3 NE 0 8 4 0 0 0 12 ENE 0 2 8 2 0 0 12 E 0 6 7 0 0 0 13 ESE 0 3 2 0 0 0 5 SE 0 2 2 4 0 0 8 SSE 0 7 6 0 0 0 13 s 0 6 14 1 0 0 21 SSW 0 3 10 1 0 0 14 SW 0 9 11 0 0 0 20 WSW 1 5 10 1 1 0 18 w 0 10 11 1 0 0 22 WNW 0 4 7 4 1 0 16 NW 0 2 6 6 0 0 14 NNW 0 2 1 3 0 0 6 Variable 0 0 0 0 0 0 0 Total 1 72 102 23 2 0 200 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 49 of 74

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2020)

METEOROLOGICAL DAT A LaSalle County Generating Station Period of Record: July - September 2020 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 0 29 32 5 0 0 66 NNE 1 32 34 2 0 0 69 NE 1 14 34 7 0 0 56 ENE 1 17 34 7 0 0 59 E 2 30 20 2 0 0 54 ESE 0 16 8 3 0 0 27 SE 2 9 14 1 0 0 26 SSE 2 22 19 0 0 0 43 s 2 10 24 9 1 0 46 SSW 1 18 19 4 0 0 42 SW 0 11 25 1 0 0 37 WSW 1 14 19 6 0 0 40 w 1 22 19 4 3 0 49 WNW 0 3 19 10 2 2 36 NW 1 8 16 10 2 1 38 NNW 0 11 47 9 0 1 68 Variable 0 0 0 0 0 0 0 Total 15 266 383 80 8 4 756 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 50 of 74

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2020)

METEOROLOGICAL DATA LaSalle County Generating Station Period of Record: July - September 2020 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 1 29 6 0 0 0 36 NNE 2 14 11 0 0 0 27 NE 2 12 7 0 0 0 21 ENE 1 9 17 1 0 0 28 E 0 25 12 0 0 0 37 ESE 1 9 3 0 0 0 13 SE 5 6 4 0 0 0 15 SSE 2 13 5 1 0 0 21 s 3 15 5 4 0 0 27 SSW 2 17 26 12 0 0 57 SW 4 15 26 17 0 0 62 WSW 2 8 8 3 0 0 21 w 1 10 21 0 3 0 35 WNW 0 15 6 0 0 0 21 NW 1 2 16 0 0 0 19 NNW 1 12 10 1 0 0 24 Variable 0 0 0 0 0 0 0 Total 28 211 183 39 3 0 464 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 51 of74

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2020)

METEOROLOGICAL DATA LaSalle County Generating Station Period of Record: July - September 2020 Stability Class - Moderately 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 1 8 1 0 0 0 10 NNE 2 10 0 0 0 0 12 NE 1 1 0 0 0 0 2 ENE 2 7 0 0 0 0 9 E 3 29 4 0 0 0 36 ESE 0 17 0 0 0 0 17 SE 2 9 0 0 0 0 11 SSE 3 12 1 0 0 0 16 s 2 26 3 0 0 0 31 SSW 0 27 7 0 0 0 34 SW 1 16 22 0 0 0 39 WSW 2 14 9 0 0 0 25 w 1 18 6 0 0 0 25 WNW 0 14 3 0 0 0 17 NW 0 4 0 0 0 0 4 NNW 1 9 2 0 0 0 12 Variable 0 0 0 0 0 0 0 Total 21 221 58 0 0 0 300 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 52 of 74

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2020)

METEOROLOGICAL DATA LaSalle County Generating Station Period of Record: July - September 2020 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 1 0 0 0 0 0 1 E 0 16 0 0 0 0 16 ESE 0 28 2 0 0 0 30 SE 2 22 2 0 0 0 26 SSE 2 35 8 0 0 0 45 s 2 41 5 0 0 0 48 SSW 0 49 7 0 0 0 56 SW 0 35 31 0 0 0 66 WSW 1 19 12 0 0 0 32 w 1 20 1 0 0 0 22 WNW 0 7 0 0 0 0 7 NW 2 0 0 0 0 0 2 NNW 0 4 0 0 0 0 4 Variable 0 0 0 0 0 0 0 Total 11 276 68 0 0 0 355 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 53 of 74

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2020)

METEOROLOGICAL DAT A LaSalle County Generating Station Period of Record: July - September 2020 Stability Class - Extremely 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 0 0 0 SW 0 0 0 0 0 0 0 WSW 0 0 0 0 0 0 0 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 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: 0 Page 54 of 74

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2020)

METEOROLOGICAL DAT A LaSalle County Generating Station Period of Record: July - September 2020 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 0 0 0 SW 0 0 0 0 0 0 0 WSW 0 0 0 1 0 0 1 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 0 0 1 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 55 of74

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2020)

METEOROLOGICAL DAT A LaSalle County Generating Station Period of Record: July - September 2020 Stability Class - Slightly 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 2 1 0 0 3 E 0 0 0 0 0 0 0 ESE 0 0 1 1 0 0 2 SE 0 0 0 0 0 0 0 SSE 0 0 0 2 0 0 2 s 0 0 0 2 1 0 3 SSW 0 0 6 2 0 0 8 SW 0 0 3 4 1 0 8 WSW 0 0 3 3 0 0 6 w 0 1 7 0 0 0 8 WNW 0 0 1 1 0 0 2 NW 0 0 0 2 2 0 4 NNW 0 0 0 2 0 0 2 Variable 0 0 0 0 0 0 0 Total 0 1 23 20 4 0 48 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 56 of 74

LASALLE COUNTY NUCLEAR POWER ST ATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2020)

METEOROLOGICAL DATA LaSalle County Generating Station Period of Record: July - September 2020 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 17 23 24 0 0 64 NNE 1 23 21 17 11 0 73 NE 0 12 9 48 12 2 83 ENE 1 20 11 40 9 2 83 E 2 17 38 9 2 0 68 ESE 0 15 12 8 0 0 35 SE 1 10 6 13 1 0 31 SSE 2 11 31 6 1 0 51 s 0 13 28 22 7 1 71 SSW 0 15 24 34 4 4 81 SW 0 13 27 29 7 3 79 WSW 1 10 34 17 8 1 71 w 1 20 32 20 2 3 78 WNW 0 14 17 19 8 6 64 NW 0 7 15 23 17 4 66 NNW 0 3 30 23 4 1 61 Variable 0 0 0 0 0 0 0 Total 9 220 358 352 93 27 1059 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 57 of 74

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2020)

METEOROLOGICAL DATA LaSalle County Generating Station Period of Record: July - September 2020 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 0 3 6 15 7 1 32 NNE 2 4 14 9 7 0 36 NE 1 7 6 11 8 0 33 ENE 1 7 24 13 2 0 47 E 0 4 31 19 3 0 57 ESE 0 4 17 9 2 0 32 SE 1 3 1 12 2 0 19 SSE 0 7 6 3 1 0 17 s 0 6 13 12 4 2 37 SSW 2 0 19 23 19 9 72 SW 1 3 23 22 20 13 82 WSW 1 3 6 17 8 3 38 w 2 3 11 15 2 5 38 WNW 0 1 2 21 1 0 25 NW 0 3 7 12 4 0 26 NNW 1 4 5 9 9 2 30 Variable 0 0 0 0 0 0 0 Total 12 62 191 222 99 35 621 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 58 of 74

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2020)

METEOROLOGICAL DATA LaSalle County Generating Station Period of Record: July - September 2020 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 1 2 0 3 0 0 6 NNE 0 3 4 1 0 0 8 NE 1 2 1 1 0 0 5 ENE 2 0 4 1 0 0 7 E 0 1 5 8 0 0 14 ESE 0 2 9 20 2 0 33 SE 0 0 5 13 1 0 19 SSE 0 0 12 12 2 3 29 s 0 0 18 19 5 1 43 SSW 0 3 20 24 6 0 53 SW 0 2 34 30 10 3 79 WSW 1 1 13 11 18 1 45 w 0 2 6 13 1 0 22 WNW 1 1 8 7 1 0 18 NW 0 1 8 18 2 0 29 NNW 2 3 1 10 0 0 16 Variable 0 0 0 0 0 0 0 Total 8 23 148 191 48 8 426 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 59 of 74

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2020)

METEOROLOGICAL DATA LaSalle County Generating Station Period of Record: July - September 2020 Stability Class - Extremely 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 0 0 0 0 NNE 0 0 0 0 0 0 0 NE 0 0 0 0 0 0 0 ENE 1 0 0 0 0 0 1 E 0 0 0 0 0 0 0 ESE 0 0 1 3 1 0 5 SE 0 0 1 5 6 1 13 SSE 0 0 0 6 4 0 10 s 0 0 1 2 4 0 7 SSW 0 0 1 6 0 0 7 SW 0 0 1 4 0 0 5 WSW 0 0 0 0 0 0 0 w 0 0 1 2 0 0 3 WNW 0 0 1 0 0 0 1 NW 0 0 0 1 0 0 1 NNW 0 0 0 0 0 0 0 Variable 0 0 0 0 0 0 0 Total 1 0 7 29 15 1 53 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 60 of 74

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2020)

METEOROLOGICAL DATA LaSalle County Generating Station Period of Record: October - December2020 Stability Class - Extremely 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 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 1 0 0 1 SSW 0 0 0 0 2 0 2 SW 0 0 0 0 0 0 0 WSW 0 0 0 0 0 0 0 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 2 0 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: 3 Page 61 of 74

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2020)

METEOROLOGICAL DATA LaSalle County Generating Station Period of Record: October - December2020 Stability Class - Moderateiy 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 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 3 5 0 8 SSW 0 0 1 1 3 1 6 SW 0 0 0 2 0 0 2 WSW 0 0 0 1 0 0 1 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 1 7 8 1 17 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 62 of 74

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2020)

METEOROLOGICAL DAT A LaSalle County Generating Station Period of Record: October - December2020 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 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 1 0 0 0 1 SSE 0 0 0 0 0 0 0 s 0 0 3 2 4 0 9 SSW 0 1 1 8 4 4 18 SW 0 0 2 4 2 0 8 WSW 0 0 5 5 0 0 10 w 0 0 0 6 1 0 7 WNW 0 0 1 2 3 0 6 NW 0 0 0 0 1 0 1 NNW 0 0 1 0 0 0 1 Variable 0 0 0 0 0 0 0 Total 0 1 14 27 15 4 61 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 63 of 74

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2020)

METEOROLOGICAL DAT A LaSalle County Generating Station Period of Record: October - December2020 Stability Class - Neutral - 200Ft-33Ft Delta-T (Fl Winds Measured at 33 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 4 51 35 10 0 0 100 NNE 0 28 32 3 0 0 63 NE 2 5 16 10 1 0 34 ENE 1 9 21 19 2 0 52 E 1 8 15 10 0 0 34 ESE 0 5 7 2 1 0 15 SE 2 2 5 13 1 0 23 SSE 0 2 4 14 9 0 29 s 0 4 6 10 12 6 38 SSW 0 6 15 19 4 7 51 SW 1 7 21 22 1 4 56 WSW 3 12 24 15 1 1 56 w 0 19 35 25 13 15 107 WNW 3 19 53 64 17 2 158 NW 1 18 39 29 3 2 92 NNW 4 19 58 52 6 0 139 Variable 0 0 0 0 0 0 0 Total 22 214 386 317 71 37 1047 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 64 of 74

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2020)

METEOROLOGICAL DATA LaSalle County Generating Station Period of Record: October - December2020 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 2 20 9 0 0 0 31 NNE 1 4 2 0 0 0 7 NE 1 0 2 0 0 0 3 ENE 1 2 5 1 0 0 9 E 1 4 11 3 0 0 19 ESE 0 1 6 2 2 1 12 SE 1 3 4 9 2 0 19 SSE 0 8 8 8 11 0 35 s 0 1 11 21 19 0 52 SSW 0 3 21 37 16 2 79 SW 1 6 15 29 8 1 60 WSW 1 3 11 21 2 1 39 w 0 7 24 10 11 8 60 WNW 2 22 22 8 9 9 72 NW 0 10 16 0 0 0 26 NNW 0 5 3 0 0 0 8 Variable 0 0 0 0 0 0 0 Total 11 99 170 149 80 22 531 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 65 of 74

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2020)

METEOROLOGICAL DATA LaSalle County Generating Station Period of Record: October - December2020 Stability Class - Moderately 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 1 11 0 0 0 0 12 NNE 2 1 1 0 0 0 4 NE 1 0 0 0 0 0 1 ENE 0 1 0 0 0 0 1 E 1 3 7 0 0 0 11 ESE 2 6 3 0 0 0 11 SE 0 15 9 0 0 0 24 SSE 0 1 10 3 0 0 14 s 1 8 12 4 0 0 25 SSW 0 14 13 14 2 0 43 SW 0 8 6 19 0 0 33 WSW 0 7 18 11 0 0 36 w 0 14 24 3 0 0 41 WNW 0 16 15 1 0 0 32 NW 1 7 2 0 0 0 10 NNW 0 7 3 0 0 0 10 Variable 0 0 0 0 0 0 0 Total 9 119 123 55 2 0 308 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 66 of 74

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2020)

METEOROLOGICAL DATA LaSalle County Generating Station Period of Record: October - December2020 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 1 0 0 0 0 1 ENE 0 0 0 0 0 0 0 E 0 6 3 0 0 0 9 ESE 0 4 5 0 0 0 9 SE 1 11 6 0 0 0 18 SSE 0 14 16 0 0 0 30 s 0 12 16 1 0 0 29 SSW 0 14 29 11 0 0 54 SW 1 4 17 7 1 0 30 WSW 0 4 20 6 0 0 30 w 0 12 4 0 0 0 16 WNW 0 5 1 0 0 0 6 NW 3 1 0 0 0 0 4 NNW 0 2 0 0 0 0 2 Variable 0 0 0 0 0 0 0 Total 5 90 117 25 1 0 238 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 67 of 74

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2020)

METEOROLOGICAL DATA LaSalle County Generating Station Period of Record: October - December2020 Stability Class - Extremely 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 0 0 0 SW 0 0 0 0 0 0 0 WSW 0 0 0 0 0 0 0 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 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: 3 Page 68 of 74

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2020)

METEOROLOGICAL DATA LaSalle County Generating Station Period of Record: October - December2020 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 0 1 1 SW 0 0 0 0 0 0 0 WSW 0 0 0 0 0 0 0 w 0 0 0 0 0 1 1 WNW 0 0 0 0 0 0 0 NW 0 0 0 0 0 1 1 NNW 0 0 0 0 0 0 0 Variable 0 0 0 0 0 0 0 Total 0 0 0 0 0 3 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: 3 Page 69 of 74

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2020)

METEOROLOGICAL DAT A LaSalle County Generating Station Period of Record: October - December2020 Stability Class - Slightly 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 1 0 3 4 SSW 0 0 0 1 0 2 3 SW 0 0 0 0 0 0 0 WSW 0 0 0 0 0 0 0 w 0 0 0 0 0 0 0 WNW 0 0 0 0 0 0 0 NW 0 0 0 0 0 2 2 NNW 0 0 0 0 0 0 0 Variable 0 0 0 0 0 0 0 Total 0 0 0 2 0 7 9 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 70 of 74

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2020)

METEOROLOGICAL DATA LaSalle County Generating Station Period of Record: October - December2020 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 13 33 34 16 4 100 NNE 1 10 34 14 6 0 65 NE 1 5 8 28 9 7 58 ENE 0 5 9 32 12 3 61 E 0 5 7 17 4 0 33 ESE 0 5 4 4 3 4 20 SE 0 3 2 2 12 2 21 SSE 0 1 3 9 10 9 32 s 1 3 6 10 12 32 64 SSW 0 2 5 17 21 31 76 SW 1 4 15 33 10 7 70 WSW 2 6 14 36 9 6 73 w 1 7 25 25 19 34 111 WNW 1 11 21 52 39 39 163 NW 2 11 33 55 31 11 143 NNW 1 10 25 34 19 13 102 Variable 0 0 0 0 0 0 0 Total 11 101 244 402 232 202 1192 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 71 of 74

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2020)

METEOROLOGICAL DATA LaSalle County Generating Station Period of Record: October - December2020 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 2 1 5 18 4 0 30 NNE 0 5 4 3 4 0 16 NE 1 0 7 2 2 0 12 ENE 0 0 3 2 0 0 5 E 1 0 3 6 7 0 17 ESE 0 2 2 7 4 0 15 SE 1 2 2 12 4 3 24 SSE 1 1 3 8 12 10 35 s 0 0 4 6 12 46 68 SSW 0 4 6 4 15 53 82 SW 0 5 13 11 21 49 99 WSW 1 3 7 11 18 18 58 w 1 4 1 15 20 10 51 WNW 0 2 12 22 13 16 65 NW 1 1 13 22 12 1 50 NNW 0 2 5 20 1 0 28 Variable 0 0 0 0 0 0 0 Total 9 32 90 169 149 206 655 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 72 of74

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2020)

METEOROLOGICAL DATA LaSalle County Generating Station Period of Record: October - December2020 Stability Class - Moderately Stable - 375Ft-33Ft Delta-T (Fl 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 2 1 3 0 6 NNE 0 0 2 1 0 0 3 NE 0 2 1 3 0 1 7 ENE 0 1 3 1 0 0 5 E 0 1 2 0 0 0 3 ESE 0 0 1 0 5 1 7 SE 0 1 1 3 4 3 12 SSE 0 2 3 4 7 4 20 s 0 0 9 7 15 1 32 SSW 1 1 3 5 7 14 31 SW 0 3 8 1 11 18 41 WSW 0 1 1 10 6 13 31 w 0 0 1 5 2 3 11 WNW 0 1 4 8 8 0 21 NW 0 0 0 14 9 0 23 NNW 0 1 2 6 1 0 10 Variable 0 0 0 0 0 0 0 Total 1 14 43 69 78 58 263 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 73 of 74

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2020)

METEOROLOGICAL DATA LaSalle County Generating Station Period of Record: October - December2020 Stability Class - Extremely 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 0 0 0 0 NNE 0 0 0 0 0 0 0 NE 0 0 0 0 0 0 0 ENE 0 1 0 1 0 0 2 E 0 0 0 1 0 0 1 ESE 0 0 1 1 0 0 2 SE 0 0 0 2 4 1 7 SSE 0 0 1 6 1 1 9 s 0 0 0 1 7 3 11 SSW 0 0 2 1 1 0 4 SW 0 0 2 6 7 0 15 WSW 0 0 2 5 3 0 10 w 0 0 1 5 4 1 11 WNW 0 1 2 2 0 0 5 NW 0 0 3 1 0 0 4 NNW 1 0 0 0 0 0 1 Variable 0 0 0 0 0 0 0 Total 1 2 14 32 27 6 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: 3 Page 74 of 74

Retrieved from "https://kanterella.com/w/index.php?title=RA21-029,_Unit_2_-_2020_Annual_Radioactive_Effluent_Release_Report&oldid=3251465"