Text

County Nuclear Power Station - Effluent and Waste Disposal Annual Report (2021)
	ML22119A031
Person / Time
Site:	LaSalle
Issue date:	04/29/2021
From:	; Constellation Energy Generation
To:	; Office of Nuclear Material Safety and Safeguards, Office of Nuclear Reactor Regulation
Shared Package
ML22122A085	List: ML22119A030; ML22119A031; ML22119A032; RA22-015, Part II, Offsite Dose Calculation Manual;
References
	RA22-015
	Download: ML22119A031 (75)
	v • d • e

Page 1 of 75 LASALLE COUNTY NUCLEAR POWER STATION ANNUAL RADIOACTIVE EFFLUENT RELEASE REPORT (ARERR)

DOCKET NUMBERS 50-373 AND 50-374 2021

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2021)

Page 2 of 75 Table of Contents 1

Regulatory Limits................................................................................................................................................... 3 1.a Gaseous Effluents............................................................................................................................................ 3 1.b Liquid Effluents............................................................................................................................................... 3 1.c Total Dose........................................................................................................................................................ 3 2

Allowable Concentrations....................................................................................................................................... 3 2.a Gaseous Effluents............................................................................................................................................ 3 2.b Liquid Effluents............................................................................................................................................... 4 3

Average Energy...................................................................................................................................................... 4 4

Measurements and Approximations of Total Radioactivity..................................................................................... 4 4.a Gaseous Effluents............................................................................................................................................ 4 4.b Liquid Effluents............................................................................................................................................... 6 5

Batch Releases........................................................................................................................................................ 6 6

Abnormal Releases.................................................................................................................................................. 6 7

Process Control Program......................................................................................................................................... 7 8

Effluent Monitoring Instrumentation time clocks and sample anomalies................................................................. 7 9

Offsite Dose Calculation Manual (ODCM) Revisions............................................................................................. 7 10 Independent Spent Fuel Storage Installation (ISFSI)............................................................................................. 7 Attachments

, ARERR Release Summary Tables (RG-1.21 Tables)............................................................................ 8, Solid Waste Shipped from LaSalle...................................................................................................... 14, Radiological Impact on Man................................................................................................................. 40, ERRATA from Previous Reports.......................................................................................................... 44, Meteorological Data............................................................................................................................. 53

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2021)

SUPPLEMENTAL INFORMATION Page 3 of 75

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 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.

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2021)

SUPPLEMENTAL INFORMATION Page 4 of 75

b. Liquid Effluents

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 2, 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

(µCi/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

a.

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) The Containment Vent and Purge System (DW) is sampled prior to release by grab sample and analyzed for principal noble gas gamma emitters and H-3.

2) The Station Vent Stack (SVS) is sampled weekly by grab sample and analyzed for principal noble gas gamma emitters and H-3.

3) The Standby Gas Treatment (SBGT) System is sampled by grab sample whenever there is flow and analyzed for principal noble gas gamma emitters.

4) All release types as listed in 4.a.1) and 4.a.2) above are sampled at the SVS Wide Range Gas Monitor (WRGM), and those listed in 4.a.3) above are sampled at the SBGT WRGM whenever there is flow.

These effluents are continuously sampled by charcoal cartridge and particulate filter paper. They are analyzed for iodines and principal gamma emitters, respectively. Particulate filter papers are composited and analyzed for gross alpha (monthly) and Fe-55, Sr-89, and Sr-90 (quarterly). Noble gases, gross beta and gamma are continuously monitored by noble gas monitors for the SVS and the SBGT System.

5) Carbon-14 a) The LaSalle County Station 2021 total estimate of 32.94 Ci of C-14 (as total C-14 released) is based upon the following:

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),

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2021)

SUPPLEMENTAL INFORMATION Page 5 of 75 a Unit 1 equivalent full power operation of 364.3 days (17.87 Ci) and a Unit 2 equivalent full power operation of 307.3 days (15.23 Ci).

Of the 32.94 Ci of C-14 produced only 95% is released as CO2 (31.3 Ci), which can be incorporated into the environment for dose analysis.

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2021)

SUPPLEMENTAL INFORMATION Page 6 of 75

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.

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, I-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:

None

2) Total time period for batch releases:

N/A

3) Maximum time period for a batch release:

N/A

4) Average time period for batch releases:

N/A

5) Minimum time period for a batch release:

N/A

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:

None

2) Total activity released:

N/A

3) Summary of release(s):

N/A

b. Liquid

1) Number of releases:

None

2) Total activity released:

N/A

3) Summary of release(s):

N/A

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2021)

SUPPLEMENTAL INFORMATION Page 7 of 75

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 2021.

b. Sample anomalies:

There were no sampling anomalies affecting the measurement of effluents experienced during 2021.

9. Offsite Dose Calculation Manual (ODCM) Revisions Revision 10 of CY-LA-170-301, Offsite Dose Calculation Manual, was issued in September 2021. The ODCM adds the statement or Required Action C.2 Enter Condition D with a Completion Time of 1 hour1.157407e-5 days 2.777778e-4 hours 1.653439e-6 weeks 3.805e-7 months to REC 12.2.2.C. The revision will allow entry into Condition D for condition when one off-gas post-treat channel is INOP rather than placing the at channel in trip, which creates a single point vulnerability to safe and reliable plant operations. Condition D requires grab sampling and analysis when both off-gas post treat channels are INOP.

10. Independent Spent Fuel Storage Installation (ISFSI)

During the period January 1, through December 31, 2021, no radioactive effluents were released from the LaSalle Nuclear Station Independent Spent Fuel Storage Installation (ISFSI). Also, during this period, eight (8) casks were transferred to the outdoor concrete ISFSI storage pad, bringing the total to 49 casks placed on the pad.

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2021)

Page 8 of 75

, ARERR Release Summary Tables (RG-1.21 Tables)

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2021)

UNIT 1 AND UNIT 2 TABLE 1-A: GASEOUS EFFLUENTS SUMMATION OF ALL RELEASES Page 9 of 75 A. Fission & Activation Gases Unit Quarter 1 Quarter 2 Quarter 3 Quarter4 Total Est. Total Error %

1. Total Release Ci 1.97E+01 8.81E+00 7.90E+00 2.10E+00 3.85E+01 2.50E+01

2. Average release rate for the period µCi/sec 2.50E+00 1.12E+00 1.00E+00 2.66E-01 1.22E+00

3. Percent of ODCM limit B. Radioiodines

1. Total Iodine - 131 Ci 2.38E-03 1.60E-03 1.32E-03 1.98E-03 7.28E-03 1.50E+01

2. Average release rate for the period µCi/sec 3.02E-04 2.03E-04 1.68E-04 2.52E-04 2.31E-04

3. Percent of ODCM limit C. Particulates

1. Particulates with half-lives > 8 days Ci 5.76E-05 4.40E-05 3.69E-08 1.07E-07 1.02E-04 3.50E+01

2. Average release rate for the period µCi/sec 7.31E-06 5.58E-06 4.70E-09 1.36E-08 3.23E-06

3. Percent of ODCM limit D. Tritium

1. Total Release Ci 3.85E+01 2.34E+01 2.16E+01 1.63E+01 9.98E+01 1.50E+01

2. Average release rate for the period µCi/sec 4.88E+00 2.97E+00 2.74E+00 2.07E+00 3.17E+00

3. Percent of ODCM limit E. Gross Alpha

1. Total Release Ci

<LLD

<LLD N/A

2. Average release rate for the period µCi/sec

<LLD

3. Percent of ODCM limit F. Carbon-14

1. Total Release Ci 7.83E+00 7.83E+00 7.83E+00 7.83E+00 3.13E+01 N/A

2. Average release rate for the period µCi/sec 9.93E-01 9.94E-01 9.93E-01 9.94E-01 9.93E-01

3. Percent of ODCM 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

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2021)

TABLE 1-B: GASEOUS EFFLUENTS ELEVATED RELEASE UNIT 1 AND UNIT 2 Page 10 of 75 Nuclides Released Continuous Mode Unit Quarter Quarter Quarter Quarter Total 1

2 3

4 A. Fission gases Ar-41 Ci

<LLD 1.98E-01 2.31E-01

<LLD 4.29E-01 Kr-85m Ci 3.82E+00 8.61E+00 7.67E+00 2.10E+00 2.22E+01 Xe-133m Ci 1.59E+01

<LLD

<LLD 1.59E+01 Ci Ci Ci Ci Ci Ci Ci Total for Period Ci 1.97E+01 8.81E+00 7.90E+00 2.10E+00 3.85E+01 B. Iodines I-131 Ci 2.38E-03 1.60E-03 1.32E-03 1.98E-03 7.28E-03 I-133 Ci 4.55E-03 4.70E-03 4.84E-03 7.39E-03 2.15E-02 Ci Ci Ci Total for Period Ci 6.94E-03 6.30E-03 6.16E-03 9.37E-03 2.88E-02 C. Particulates Co-60 Ci 5.74E-05 4.39E-05 3.69E-08 1.07E-07 1.02E-04 Y-91m Ci 6.38E-03 1.11E-02 8.02E-03

< LLD 2.55E-02 Ba-139 Ci 3.30E-02 6.07E-02 9.17E-02 5.35E-02 2.39E-01 Ci Ci Ci Ci Ci Ci Ci Ci Ci Total for Period Ci 3.94E-02 7.18E-02 9.97E-02 5.35E-02 2.65E-01 D. Tritium Ci 3.85E+01 2.34E+01 2.16E+01 1.63E+01 9.98E+01 E. Gross Alpha Ci

<LLD

<LLD F. Carbon-14 Ci 7.83E+00 7.83E+00 7.83E+00 7.83E+00 3.13E+01 Note: Only nuclides with positive activity are reported.

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2021)

TABLE 1-B: GASEOUS EFFLUENTS ELEVATED RELEASE UNIT 1 AND UNIT 2 Page 11 of 75 Nuclides Released Batch Mode Unit Quarter Quarter Quarter Quarter Total 1

2 3

4 A. Fission gases None Ci N/A N/A N/A N/A N/A Ci Ci Ci Ci Ci Ci Ci Ci Ci Total for Period Ci N/A N/A N/A N/A N/A B. Iodines None Ci N/A N/A N/A N/A N/A Ci Ci Ci Ci Total for Period Ci N/A N/A N/A N/A N/A C. Particulates None Ci N/A N/A N/A N/A N/A Ci Ci Ci Ci Ci Ci Ci Ci Ci Ci Ci Ci Ci Ci Total for Period Ci N/A N/A N/A N/A N/A D. Tritium Ci N/A N/A N/A N/A N/A E. Gross Alpha Ci N/A N/A N/A N/A N/A F. Carbon-14 Ci N/A N/A N/A N/A N/A

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2021)

TABLE 2A: LIQUID RELEASES UNIT 1 AND UNIT 2 SUMMATION OF ALL LIQUID RELEASES Page 12 of 75 A. Fission & Activation Products Unit Quarter 1 Quarter 2 Quarter 3 Quarter4 Total Est. Total Error %

1. Total Release (not including tritium, gases

& alpha)

Ci

<LLD

<LLD N/A

2. Average diluted concentration during period

µCi/mL

<LLD

3. Percent of applicable limit B. Tritium

1. Total Release Ci

<LLD

<LLD N/A

2. Average diluted concentration during period

µCi/mL

<LLD

3. Percent of applicable limit C. Dissolved & Entrained Gases

1. Total Release Ci

<LLD

<LLD N/A

2. Average diluted concentration during period

µCi/mL

<LLD

3. Percent of applicable limit D. Gross Alpha Activity

1. Total Release Ci

<LLD

<LLD N/A

2. Average release rate for the period

µCi/mL

<LLD

3. Percent of ODCM limit E. Volume of Waste Released (prior to dilution)

Liters 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 F. Volume of Dilution Water Used During Period Liters 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00

"*" 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

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2021)

TABLE 2B: LIQUID RELEASES UNIT 1 AND UNIT 2 Page 13 of 75 Nuclides Released Continuous Mode Batch Mode A. Fission &

Activation Products Unit Quarter Quarter Quarter Quarter Total Quarter Quarter Quarter Quarter Total 1

2 3

4 1

2 3

4 None Ci N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A Ci Ci Ci Ci Ci Ci Total for Period Ci N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A B. H-3 H-3 Total for Period Ci N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A C. Dissolved &

Entrained Gasses None Ci N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A Ci Ci Ci Ci Ci Ci Ci Total for Period Ci N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A D. Gross Alpha Gross Alpha Total for Period Ci N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2021)

Page 14 of 75

, Solid Waste Shipped from LaSalle

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2021)

Solid Waste Shipped Offsite for Burial or Disposal and Estimates of Major Nuclides by Waste Class and Stream During Period From 01/01/2021 to 03/31/2021 Page 15 of 75 Resins, Filters, and Evaporator Bottoms Summary for the LaSalle Site Waste Volume Curies

% Error Class ft3 m3 Shipped (Activity)

A 3.80E+01 1.08E+00 1.83E+00

+/-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 3.80E+01 1.08E+00 1.83E+00

+/-25%

Major Nuclides for Above Table:

H-3, C-14, Fe-55, Co-60, Ni-59, Ni-63, Sr-90, Tc-99, 1-129, Cs-137, Pu-238, Pu-239, Pu-241, Am-241, Cm-242, Cm-244 Waste Class A

> 1% Abundance Nuclide Name Abundance Curies Fe-55 25.39%

4.65E-01 Co-60 71.99%

1.32E+00 Ni-63 1.47%

2.69E-02 Waste Class B

> 1% Abundance Nuclide Name Abundance Curies None N/A N/A Waste Class C

> 1% Abundance Nuclide Name Abundance Curies None N/A N/A Total Combined

> 1% Abundance Nuclide Name Abundance Curies Fe-55 25.39%

4.65E-01 Co-60 71.99%

1.32E+00 Ni-63 1.47%

2.69E-02

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2021)

Solid Waste Shipped Offsite for Burial or Disposal and Estimates of Major Nuclides by Waste Class and Stream During Period From 01/01/2021 to 03/31/2021 Page 16 of 75 Dry Active Waste (DAW) Summary for the LaSalle Site Waste Volume Curies

% Error Class ft3 m3 Shipped (Activity)

A 2.32E+04 6.56E+02 1.48E+00

+/-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 2.32E+04 6.56E+02 1.48E+00

+/-25%

Major Nuclides for Above Table:

H-3, C-14, Fe-55, Co-60, Ni-63, Sr-89, Sr-90, Tc-99, 1-129, Cs-137, Am-241, Cm-242, Cm-244 Waste Class A

> 1% Abundance Nuclide Name Abundance Curies Fe-55 8.88%

1.31E-01 Co-60 87.06%

1.29E+00 Cs-137 1.43%

2.12E-02 Waste Class B

> 1% Abundance Nuclide Name Abundance Curies None N/A N/A Waste Class C

> 1% Abundance Nuclide Name Abundance Curies None N/A N/A Total Combined

> 1% Abundance Nuclide Name Abundance Curies Fe-55 8.88%

1.31E-01 Co-60 87.06%

1.29E+00 Cs-137 1.43%

2.12E-02

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2021)

Solid Waste Shipped Offsite for Burial or Disposal and Estimates of Major Nuclides by Waste Class and Stream During Period From 01/01/2021 to 03/31/2021 Page 17 of 75 Irradiated Components Summary for the LaSalle Site Waste Volume Curies

% Error Class ft3 m3 Shipped (Activity)

A 0.00E+00 0.00E+00 0.00E+00

+/-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 0.00E+00 0.00E+00 0.00E+00

+/-25%

Major Nuclides for Above Table:

Waste Class A

> 1% Abundance Nuclide Name Abundance Curies None N/A N/A Waste Class B

> 1% Abundance Nuclide Name Abundance Curies None N/A N/A Waste Class C

> 1% Abundance Nuclide Name Abundance Curies None N/A N/A Total Combined

> 1% Abundance Nuclide Name Abundance Curies None N/A N/A

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2021)

Solid Waste Shipped Offsite for Burial or Disposal and Estimates of Major Nuclides by Waste Class and Stream During Period From 01/01/2021 to 03/31/2021 Page 18 of 75 Other Waste Summary for the LaSalle Site Waste Volume Curies

% Error Class ft3 m3 Shipped (Activity)

A 2.06E+02 5.84E+00 1.89E-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 2.06E+02 5.84E+00 1.89E-02

+/-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 Waste Class A

> 1% Abundance Nuclide Name Abundance Curies H-3 85.77%

1.62E-02 Fe-55 1.27%

2.40E-04 Co-60 12.41%

2.35E-03 Waste Class B

> 1% Abundance Nuclide Name Abundance Curies None N/A N/A Waste Class C

> 1% Abundance Nuclide Name Percent Abundance Curies None N/A N/A Total Combined

> 1% Abundance Nuclide Name Abundance Curies H-3 85.77%

1.62E-02 Fe-55 1.27%

2.40E-04 Co-60 12.41%

2.35E-03

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2021)

Solid Waste Shipped Offsite for Burial or Disposal and Estimates of Major Nuclides by Waste Class and Stream During Period From 01/01/2021 to 03/31/2021 Page 19 of 75 Sum of All Low-Level Waste Shipped from the LaSalle Site Waste Volume Curies

% Error Class ft3 m3 Shipped (Activity)

A 2.34E+04 6.63E+02 3.32E+00

+/-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 2.34E+04 6.63E+02 3.32E+00

+/-25%

Major Nuclides for Above Table:

H-3, C-14, Fe-55, Co-60, Ni-59, Ni-63, Sr-89, Sr-90, Tc-99, 1-129, Cs-137, Pu-238, Pu-239, Pu-241, Am-241, Cm-242, Cm-244 Waste Class A

> 1% Abundance Nuclide Name Abundance Curies Fe-55 17.92 5.96E-01 Co-60 78.34 2.61E+00 Ni-63 1.03 3.43E-02 Waste Class B

> 1% Abundance Nuclide Name Abundance Curies None N/A N/A Waste Class C

> 1% Abundance Nuclide Name Abundance Curies None N/A N/A Total Combined

> 1% Abundance Nuclide Name Abundance Curies Fe-55 17.92 5.96E-01 Co-60 78.34 2.61E+00 Ni-63 1.03 3.43E-02 Total Shipments by Carrier Number of Shipments Mode of Transportation Destination 10 Hittman Transport Energy Solutions - Bear Creek 1560 Bear Creek Road 3

Interstate Ventures Energy Solutions - Bear Creek 1560 Bear Creek Road

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2021)

Solid Waste Shipped Offsite for Burial or Disposal and Estimates of Major Nuclides by Waste Class and Stream During Period From 04/01/2021 to 06/30/2021 Page 20 of 75 Resins, Filters, and Evaporator Bottoms Summary for the LaSalle Site Waste Volume Curies

% Error Class ft3 m3 Shipped (Activity)

A 1.41E+03 4.00E+01 1.13E+01

+/-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 1.41E+03 4.00E+01 1.13E+01

+/-25%

Major Nuclides for Above Table:

H-3, C-14, Mn-54, Fe-55, Co-60, Ni-63, Sr-90, Tc-99, 1-129, Cs-137 Waste Class A

> 1% Abundance Nuclide Name Abundance Curies C-14 54.71%

6.18E+00 Fe-55 2.76%

3.11E-01 Co-60 39.29%

4.44E+00 Waste Class B

> 1% Abundance Nuclide Name Abundance Curies None N/A N/A Waste Class C

> 1% Abundance Nuclide Name Abundance Curies None N/A N/A Total Combined

> 1% Abundance Nuclide Name Abundance Curies C-14 54.71%

6.18E+00 Fe-55 2.76%

3.11E-01 Co-60 39.29%

4.44E+00

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2021)

Solid Waste Shipped Offsite for Burial or Disposal and Estimates of Major Nuclides by Waste Class and Stream During Period From 04/01/2021 to 06/30/2021 Page 21 of 75 Dry Active Waste (DAW) Summary for the LaSalle Site Waste Volume Curies

% Error Class ft3 m3 Shipped (Activity)

A 5.17E+03 1.46E+02 8.86E-01

+/-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 5.17E+03 1.46E+02 8.86E-01

+/-25%

Major Nuclides for Above Table:

H-3, C-14, Mn-54, Fe-55, Co-60, Ni-63, Sr-90, Tc-99, 1-129, Cs-137, Ce-144, Pu-238, Am-241 Waste Class A

> 1% Abundance Nuclide Name Abundance Curies Mn-54 1.92%

1.70E-02 Fe-55 25.55%

2.27E-01 Co-60 70.63%

6.26E-01 Waste Class B

> 1% Abundance Nuclide Name Abundance Curies None N/A N/A Waste Class C

> 1% Abundance Nuclide Name Abundance Curies None N/A N/A Total Combined

> 1% Abundance Nuclide Name Abundance Curies Mn-54 1.92%

1.70E-02 Fe-55 25.55%

2.27E-01 Co-60 70.63%

6.26E-01

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2021)

Solid Waste Shipped Offsite for Burial or Disposal and Estimates of Major Nuclides by Waste Class and Stream During Period From 04/01/2021 to 06/30/2021 Page 22 of 75 Irradiated Components Summary for the LaSalle Site Waste Volume Curies

% Error Class ft3 m3 Shipped (Activity)

A 0.00E+00 0.00E+00 0.00E+00

+/-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 0.00E+00 0.00E+00 0.00E+00

+/-25%

Major Nuclides for Above Table:

Waste Class A

> 1% Abundance Nuclide Name Abundance Curies None N/A N/A Waste Class B

> 1% Abundance Nuclide Name Abundance Curies None N/A N/A Waste Class C

> 1% Abundance Nuclide Name Abundance Curies None N/A N/A Total Combined

> 1% Abundance Nuclide Name Abundance Curies None N/A N/A

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2021)

Solid Waste Shipped Offsite for Burial or Disposal and Estimates of Major Nuclides by Waste Class and Stream During Period From 04/01/2021 to 06/30/2021 Page 23 of 75 Other Waste Summary for the LaSalle Site Waste Volume Curies

% Error Class ft3 m3 Shipped (Activity)

A 2.63E+02 7.43E+00 2.53E-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 2.63E+02 7.43E+00 2.53E-02

+/-25%

Major Nuclides for Above Table:

H-3, C-14, Co-60, Ni-63, Sr-90, Tc-99, 1-129, Cs-137, Am-241, Cm-242, Cm-244 Waste Class A

> 1% Abundance Nuclide Name Percent Abundance Curies H-3 88.93%

2.25E-02 Co-60 9.65%

2.44E-03 Waste Class B

> 1% Abundance Nuclide Name Abundance Curies None N/A N/A Waste Class C

> 1% Abundance Nuclide Name Abundance Curies None N/A N/A Total Combined

> 1% Abundance Nuclide Name Abundance Curies H-3 88.93%

2.25E-02 Co-60 9.65%

2.44E-03

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2021)

Solid Waste Shipped Offsite for Burial or Disposal and Estimates of Major Nuclides by Waste Class and Stream During Period From 04/01/2021 to 06/30/2021 Page 24 of 75 Sum of All Low-Level Waste Shipped from the LaSalle Site Waste Volume Curies

% Error Class ft3 m3 Shipped (Activity)

A 6.85E+03 1.94E+02 1.22E+01

+/-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 6.85E+03 1.94E+02 1.22E+01

+/-25%

Major Nuclides for Above Table:

H-3, C-14, Mn-54, Fe-55, Co-60, Ni-63, Sr-90, Tc-99, 1-129, Cs-137, Ce-144, Pu-238, Am-241, Cm-242, Cm-244 Waste Class A

> 1% Abundance Nuclide Name Abundance Curies C-14 50.63%

6.18E+00 Fe-55 4.41%

5.38E-01 Co-60 41.5%

5.07E+00 Waste Class B

> 1% Abundance Nuclide Name Abundance Curies None N/A N/A Waste Class C

> 1% Abundance Nuclide Name Abundance Curies None N/A N/A Total Combined

> 1% Abundance Nuclide Name Abundance Curies C-14 50.63%

6.18E+00 Fe-55 4.41%

5.38E-01 Co-60 41.5%

5.07E+00 Total Shipments by Carrier Number of Shipments Mode of Transportation Destination 4

Hittman Transport Energy Solutions - Bear Creek 1560 Bear Creek Road 8

Hittman Transport Energy Solutions LLC Containerized Waste Facility

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2021)

Solid Waste Shipped Offsite for Burial or Disposal and Estimates of Major Nuclides by Waste Class and Stream During Period From 07/01/2021 to 09/30/2021 Page 25 of 75 Resins, Filters, and Evaporator Bottoms Summary for the LaSalle Site Waste Volume Curies

% Error Class ft3 m3 Shipped (Activity)

A 1.20E+03 3.40E+01 2.07E+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 1.20E+03 3.40E+01 2.07E+02

+/-25%

Major Nuclides for Above Table H-3, C-14, Mn-54, Fe-55, Co-60, Ni-63, Sr-90, Tc-99, 1-129, Cs-137, Ce-144, Pu-238, Pu-239, Pu-240, Pu-241, Am-241, Cm-242, Cm-243, Cm-244 Waste Class A

> 1% Abundance Nuclide Name Abundance Curies C-14 1.76%

3.63E+00 Fe-55 22.92%

4.74E+01 Co-60 72.61%

1.50E+02 Ni-63 1.18%

2.44E+00 Waste Class B

> 1% Abundance Nuclide Name Abundance Curies None N/A N/A Waste Class C

> 1% Abundance Nuclide Name Abundance Curies None N/A N/A Total Combined

> 1% Abundance Nuclide Name Abundance Curies C-14 1.76%

3.63E+00 Fe-55 22.92%

4.74E+01 Co-60 72.61%

1.50E+02 Ni-63 1.18%

2.44E+00

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2021)

Solid Waste Shipped Offsite for Burial or Disposal and Estimates of Major Nuclides by Waste Class and Stream During Period From 07/01/2021 to 09/30/2021 Page 26 of 75 Dry Active Waste (DAW) Summary for the LaSalle Site Waste Volume Curies

% Error Class ft3 m3 Shipped (Activity)

A 5.07E+01 1.44E+00 2.90E-01

+/-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 5.07E+01 1.44E+00 2.90E-01

+/-25%

Major Nuclides for Above Table:

H-3, C-14, Mn-54, Fe-55, Co-60, Ni-63, Sr-90, Tc-99, 1-129, Cs-137, Ce-144, Pu-238, Am-241 Waste Class A

> 1% Abundance Nuclide Name Abundance Curies H-3 1.1%

3.20E-03 Mn-54 1.91%

5.55E-03 Fe-55 25.37%

7.37E-02 Co-60 70.1%

2.04E-01 Waste Class B

> 1% Abundance Nuclide Name Abundance Curies None N/A N/A Waste Class C

> 1% Abundance Nuclide Name Abundance Curies None N/A N/A Total Combined

> 1% Abundance Nuclide Name Abundance Curies H-3 1.1%

3.20E-03 Mn-54 1.91%

5.55E-03 Fe-55 25.37%

7.37E-02 Co-60 70.1%

2.04E-01

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2021)

Solid Waste Shipped Offsite for Burial or Disposal and Estimates of Major Nuclides by Waste Class and Stream During Period From 07/01/2021 to 09/30/2021 Page 27 of 75 Irradiated Components Summary for the LaSalle Site Waste Volume Curies

% Error Class ft3 m3 Shipped (Activity)

A 0.00E+00 0.00E+00 0.00E+00

+/-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 0.00E+00 0.00E+00 0.00E+00

+/-25%

Major Nuclides for Above Table:

Waste Class A

> 1% Abundance Nuclide Name Abundance Curies None N/A N/A Waste Class B

> 1% Abundance Nuclide Name Abundance Curies None N/A N/A Waste Class C

> 1% Abundance Nuclide Name Abundance Curies None N/A N/A Total Combined

> 1% Abundance Nuclide Name Abundance Curies None N/A N/A

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2021)

Solid Waste Shipped Offsite for Burial or Disposal and Estimates of Major Nuclides by Waste Class and Stream During Period From 07/01/2021 to 09/30/2021 Page 28 of 75 Other Waste Summary for the LaSalle Site Waste Volume Curies

% Error Class ft3 m3 Shipped (Activity)

A 0.00E+00 0.00E+00 0.00E+00

+/-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 0.00E+00 0.00E+00 0.00E+00

+/-25%

Major Nuclides for Above Table:

Waste Class A

> 1% Abundance Nuclide Name Abundance Curies None N/A N/A Waste Class B

> 1% Abundance Nuclide Name Abundance Curies None N/A N/A Waste Class C

> 1% Abundance Nuclide Name Abundance Curies None N/A N/A Total Combined

> 1% Abundance Nuclide Name Abundance Curies None N/A N/A

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2021)

Solid Waste Shipped Offsite for Burial or Disposal and Estimates of Major Nuclides by Waste Class and Stream During Period From 07/01/2021 to 09/30/2021 Page 29 of 75 Sum of All Low-Level Waste Shipped from the LaSalle Site Waste Volume Curies

% Error Class ft3 m3 Shipped (Activity)

A 1.25E+03 3.55E+01 2.07E+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 1.25E+03 3.55E+01 2.07E+02

+/-25%

Major Nuclides for Above Table:

H-3, C-14, Mn-54, Fe-55, Co-60, Ni-63, Sr-90, Tc-99, 1-129, Cs-137, Ce-144, Pu-238, Pu-239, Pu-240, Pu-241, Am-241, Cm-242, Cm-243, Cm-244 Waste Class A

> 1% Abundance Nuclide Name Abundance Curies C-14 1.75%

3.63E+00 Fe-55 22.92%

4.74E+01 Co-60 72.8%

1.50E+02 Ni-63 1.18%

2.44E+00 Waste Class B

> 1% Abundance Nuclide Name Abundance Curies None N/A N/A Waste Class C

> 1% Abundance Nuclide Name Abundance Curies None N/A N/A Total Combined

> 1% Abundance Nuclide Name Abundance Curies C-14 1.75%

3.63E+00 Fe-55 22.92%

4.74E+01 Co-60 72.8%

1.50E+02 Ni-63 1.18%

2.44E+00 Total Shipments by Carrier Number of Shipments Mode of Transportation Destination 4

Hittman Transport Energy Solutions - Bear Creek 1560 Bear Creek Road 7

Hittman Transport Energy Solutions LLC Containerized Waste Facility

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2021)

Solid Waste Shipped Offsite for Burial or Disposal and Estimates of Major Nuclides by Waste Class and Stream During Period From 10/01/2021 to 12/31/2021 Page 30 of 75 Resins, Filters, and Evaporator Bottoms Summary for the LaSalle Site Waste Volume Curies

% Error Class ft3 m3 Shipped (Activity)

A 1.77E+02 5.01E+00 4.27E+00

+/-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 1.77E+02 5.01E+00 4.27E+00

+/-25%

Major Nuclides for Above Table H-3, C-14, Fe-55, Co-60, Ni-63, Sr-90, Tc-99, 1-129, Cs-137 Waste Class A

> 1% Abundance Nuclide Name Abundance Curies C-14 58.95%

2.52E+00 Fe-55 2.74%

1.17E-01 Co-60 36%

1.54E+00 Waste Class B

> 1% Abundance Nuclide Name Abundance Curies None N/A N/A Waste Class C

> 1% Abundance Nuclide Name Abundance Curies None N/A N/A Total Combined

> 1% Abundance Nuclide Name Abundance Curies C-14 58.95%

2.52E+00 Fe-55 2.74%

1.17E-01 Co-60 36%

1.54E+00

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2021)

Solid Waste Shipped Offsite for Burial or Disposal and Estimates of Major Nuclides by Waste Class and Stream During Period From 10/01/2021 to 12/31/2021 Page 31 of 75 Dry Active Waste (DAW) Summary for the LaSalle Site Waste Volume Curies

% Error Class ft3 m3 Shipped (Activity)

A 0.00E+00 0.00E+00 0.00E+00

+/-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 0.00E+00 0.00E+00 0.00E+00

+/-25%

Major Nuclides for Above Table:

Waste Class A

> 1% Abundance Nuclide Name Abundance Curies None N/A N/A Waste Class B

> 1% Abundance Nuclide Name Abundance Curies None N/A N/A Waste Class C

> 1% Abundance Nuclide Name Abundance Curies None N/A N/A Total Combined

> 1% Abundance Nuclide Name Abundance Curies None N/A N/A

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2021)

Solid Waste Shipped Offsite for Burial or Disposal and Estimates of Major Nuclides by Waste Class and Stream During Period From 10/01/2021 to 12/31/2021 Page 32 of 75 Irradiated Components Summary for the LaSalle Site Waste Volume Curies

% Error Class ft3 m3 Shipped (Activity)

A 0.00E+00 0.00E+00 0.00E+00

+/-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 0.00E+00 0.00E+00 0.00E+00

+/-25%

Major Nuclides for Above Table:

Waste Class A

> 1% Abundance Nuclide Name Abundance Curies None N/A N/A Waste Class B

> 1% Abundance Nuclide Name Abundance Curies None N/A N/A Waste Class C

> 1% Abundance Nuclide Name Abundance Curies None N/A N/A Total Combined

> 1% Abundance Nuclide Name Abundance Curies None N/A N/A

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2021)

Solid Waste Shipped Offsite for Burial or Disposal and Estimates of Major Nuclides by Waste Class and Stream During Period From 10/01/2021 to 12/31/2021 Page 33 of 75 Other Waste Summary for the LaSalle Site Waste Volume Curies

% Error Class ft3 m3 Shipped (Activity)

A 0.00E+00 0.00E+00 0.00E+00

+/-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 0.00E+00 0.00E+00 0.00E+00

+/-25%

Major Nuclides for Above Table:

Waste Class A

> 1% Abundance Nuclide Name Abundance Curies None N/A N/A Waste Class B

> 1% Abundance Nuclide Name Abundance Curies None N/A N/A Waste Class C

> 1% Abundance Nuclide Name Abundance Curies None N/A N/A Total Combined

> 1% Abundance Nuclide Name Abundance Curies None N/A N/A

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2021)

Solid Waste Shipped Offsite for Burial or Disposal and Estimates of Major Nuclides by Waste Class and Stream During Period From 10/01/2021 to 12/31/2021 Page 34 of 75 Sum of All Low-Level Waste Shipped from the LaSalle Site Waste Volume Curies

% Error Class ft3 m3 Shipped (Activity)

A 1.77E+02 5.01E+00 4.27E+00

+/-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 1.77E+02 5.01E+00 4.27E+00

+/-25%

Major Nuclides for Above Table:

H-3, C-14, Fe-55, Co-60, Ni-63, Sr-90, Tc-99, 1-129, Cs-137 Waste Class A

> 1% Abundance Nuclide Name Abundance Curies C-14 58.95%

2.52E+00 Fe-55 2.74%

1.17E-01 Co-60 36%

1.54E+00 Waste Class B

> 1% Abundance Nuclide Name Abundance Curies None N/A N/A Waste Class C

> 1% Abundance Nuclide Name Abundance Curies None N/A N/A Total Combined

> 1% Abundance Nuclide Name Abundance Curies C-14 58.95%

2.52E+00 Fe-55 2.74%

1.17E-01 Co-60 36%

1.54E+00 Total Shipments by Carrier Number of Shipments Mode of Transportation Destination 1

Hittman Transport Energy Solutions LLC Containerized Waste Facility

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2021)

Solid Waste Shipped Offsite for Burial or Disposal and Estimates of Major Nuclides by Waste Class and Stream During Period From 01/01/2021 to 12/31/2021 Page 35 of 75 Resins, Filters, and Evaporator Bottoms Summary for the LaSalle Site Waste Volume Curies

% Error Class ft3 m3 Shipped (Activity)

A 2.83E+03 8.02E+01 2.24E+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 2.83E+03 8.02E+01 2.24E+02

+/-25%

Major Nuclides for Above Table H-3, C-14, Mn-54, Fe-55, Co-60, Ni-59, Ni-63, Sr-90, Tc-99, I-129, Cs-137, Ce-144, Pu-238, Pu-240, Pu-241, Am-241, Cm-242, Cm-243, Cm-244 Waste Class A

> 1% Abundance Nuclide Name Abundance Curies C-14 5.5%

1.23E+01 Fe-55 21.54%

4.82E+01 Co-60 70.22%

1.57E+02 Ni-63 1.15%

2.58E+00 Waste Class B

> 1% Abundance Nuclide Name Abundance Curies None N/A N/A Waste Class C

> 1% Abundance Nuclide Name Abundance Curies None N/A N/A Total Combined

> 1% Abundance Nuclide Name Abundance Curies C-14 5.5%

1.23E+01 Fe-55 21.54%

4.82E+01 Co-60 70.22%

1.57E+02 Ni-63 1.15%

2.58E+00

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2021)

Solid Waste Shipped Offsite for Burial or Disposal and Estimates of Major Nuclides by Waste Class and Stream During Period From 01/01/2021 to 12/31/2021 Page 36 of 75 Dry Active Waste (DAW) Summary for the LaSalle Site Waste Volume Curies

% Error Class ft3 m3 Shipped (Activity)

A 2.84E+04 8.04E+02 2.65E+00

+/-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 2.84E+04 8.04E+02 2.65E+00

+/-25%

Major Nuclides for Above Table:

H-3, C-14, Mn-54, Fe-55, Co-60, Ni-63, Sr-89, Sr-90, Tc-99, I-129, Cs-137, Ce-144, Pu-238, Am-241, Cm-242, Cm-244 Waste Class A

> 1% Abundance Nuclide Name Abundance Curies Mn-54 1%

2.66E-02 Fe-55 16.25%

4.31E-01 Co-60 79.72%

2.12E+00 Cs-137 1.06%

2.80E-02 Waste Class B

> 1% Abundance Nuclide Name Abundance Curies None N/A N/A Waste Class C

> 1% Abundance Nuclide Name Abundance Curies None N/A N/A Total Combined

> 1% Abundance Nuclide Name Abundance Curies Mn-54 1%

2.66E-02 Fe-55 16.25%

4.31E-01 Co-60 79.72%

2.12E+00 Cs-137 1.06%

2.80E-02

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2021)

Solid Waste Shipped Offsite for Burial or Disposal and Estimates of Major Nuclides by Waste Class and Stream During Period From 01/01/2021 to 12/31/2021 Page 37 of 75 Irradiated Components Summary for the LaSalle Site Waste Volume Curies

% Error Class ft3 m3 Shipped (Activity)

A 0.00E+00 0.00E+00 0.00E+00

+/-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 0.00E+00 0.00E+00 0.00E+00

+/-25%

Major Nuclides for Above Table:

Waste Class A

> 1% Abundance Nuclide Name Abundance Curies None N/A N/A Waste Class B

> 1% Abundance Nuclide Name Abundance Curies None N/A N/A Waste Class C

> 1% Abundance Nuclide Name Abundance Curies None N/A N/A Total Combined

> 1% Abundance Nuclide Name Abundance Curies None N/A N/A

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2021)

Solid Waste Shipped Offsite for Burial or Disposal and Estimates of Major Nuclides by Waste Class and Stream During Period From 01/01/2021 to 12/31/2021 Page 38 of 75 Other Waste Summary for the LaSalle Site Waste Volume Curies

% Error Class ft3 m3 Shipped (Activity)

A 4.69E+02 1.33E+01 4.42E-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 4.69E+02 1.33E+01 4.42E-02

+/-25%

Major Nuclides for Above Table:

H-3, C-14, Fe-55, Co-60, Ni-63, Sr-90, Tc-99, I-129, Cs-137, Am-241, Cm-242, Cm-244 Waste Class A

> 1% Abundance Nuclide Name Abundance Curies H-3 87.58%

3.87E-02 Fe-55 1.11%

4.90E-04 Co-60 10.83%

4.79E-03 Waste Class B

> 1% Abundance Nuclide Name Abundance Curies None N/A N/A Waste Class C

> 1% Abundance Nuclide Name Abundance Curies None N/A N/A Total Combined

> 1% Abundance Nuclide Name Abundance Curies H-3 87.58%

3.87E-02 Fe-55 1.11%

4.90E-04 Co-60 10.83%

4.79E-03

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2021)

Solid Waste Shipped Offsite for Burial or Disposal and Estimates of Major Nuclides by Waste Class and Stream During Period From 01/01/2021 to 12/31/2021 Page 39 of 75 Sum of All Low-Level Waste Shipped from the LaSalle Site Waste Volume Curies

% Error Class ft3 m3 Shipped (Activity)

A 3.17E+04 8.97E+02 2.27E+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 3.17E+04 8.97E+02 2.27E+02

+/-25%

Major Nuclides for Above Table:

H-3, C-14, Mn-54, Fe-55, Co-60, Ni-59, Ni-63, Sr-89, Sr-90, Tc-99, I-129, Cs-137, Ce-144, Pu-238, Pu-239, Pu-240, Pu-241, Am-241, Cm-242, Cm-243, Cm-244 Waste Class A

> 1% Abundance Nuclide Name Abundance Curies C-14 5.44%

1.23E+01 Fe-55 21.47%

4.87E+01 Co-60 70.32%

1.59E+02 Ni-63 1.14%

2.59E+00 Waste Class B

> 1% Abundance Nuclide Name Abundance Curies None N/A N/A Waste Class C

> 1% Abundance Nuclide Name Abundance Curies None N/A N/A Total Combined

> 1% Abundance Nuclide Name Abundance Curies C-14 5.44%

1.23E+01 Fe-55 21.47%

4.87E+01 Co-60 70.32%

1.59E+02 Ni-63 1.14%

2.59E+00 Total Shipments by Carrier Number of Shipments Mode of Transportation Destination 18 Hittman Transport Energy Solutions - Bear Creek 1560 Bear Creek Road 16 Hittman Transport Energy Solutions LLC Containerized Waste Facility 3

Interstate Ventures Energy Solutions - Bear Creek 1560 Bear Creek Road

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2021)

RADIOLOGICAL IMPACT ON MAN Page 40 of 75

, Radiological Impact on Man

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2021)

RADIOLOGICAL IMPACT ON MAN MAXIMUM DOSES RESULTING FROM GASEOUS RELEASES AND COMPLIANCE STATUS Page 41 of 75 Adult Receptor Quarterly Limit Units 1st Quarter

% of Limit 2nd Quarter

% of Limit 3rd Quarter

% of Limit 4th Quarter

% of Limit Annual Limit Annual

% of Limit Gamma Air 5.00E+00 mRad 1.30E-05 2.60E-04 2.17E-05 4.34E-04 2.07E-05 4.14E-04 4.08E-06 8.16E-05 1.00E+01 5.94E-05 5.94E-04 Beta Air 1.00E+01 mRad 8.34E-06 8.34E-05 4.73E-06 4.73E-05 4.26E-06 4.26E-05 1.11E-06 1.11E-05 2.00E+01 1.84E-05 1.84E-04 NG Total Body 2.50E+00 mRem 8.62E-06 3.45E-04 1.46E-05 5.84E-04 1.39E-05 5.56E-04 2.75E-06 1.10E-04 5.00E+00 3.98E-05 3.98E-04 NG Skin 7.50E+00 mRem 1.84E-05 2.45E-04 2.64E-05 3.52E-04 2.50E-05 3.33E-04 5.08E-06 6.77E-05 1.50E+01 7.49E-05 7.49E-04 NNG Organ 7.50E+00 mRem 3.14E-03 4.19E-02 3.13E-03 4.17E-02 3.13E-03 4.17E-02 3.13E-03 4.17E-02 1.50E+01 1.25E-02 1.25E-01 Teenager Receptor Quarterly Limit Units 1st Quarter

% of Limit 2nd Quarter

% of Limit 3rd Quarter

% of Limit 4th Quarter

% of Limit Annual Limit Annual

% of Limit Gamma Air 5.00E+00 mRad 1.30E-05 2.60E-04 2.17E-05 4.34E-04 2.07E-05 4.14E-04 4.08E-06 8.16E-05 1.00E+01 5.94E-05 5.94E-04 Beta Air 1.00E+01 mRad 8.34E-06 8.34E-05 4.73E-06 4.73E-05 4.26E-06 4.26E-05 1.11E-06 1.11E-05 2.00E+01 1.84E-05 1.84E-04 NG Total Body 2.50E+00 mRem 8.62E-06 3.45E-04 1.46E-05 5.84E-04 1.39E-05 5.56E-04 2.75E-06 1.10E-04 5.00E+00 3.98E-05 3.98E-04 NG Skin 7.50E+00 mRem 1.84E-05 2.45E-04 2.64E-05 3.52E-04 2.50E-05 3.33E-04 5.08E-06 6.77E-05 1.50E+01 7.49E-05 7.49E-04 NNG Organ 7.50E+00 mRem 4.73E-03 6.31E-02 4.73E-03 6.31E-02 4.72E-03 6.29E-02 4.72E-03 6.29E-02 1.50E+01 1.89E-02 1.89E-01 Child Receptor Quarterly Limit Units 1st Quarter

% of Limit 2nd Quarter

% of Limit 3rd Quarter

% of Limit 4th Quarter

% of Limit Annual Limit Annual

% of Limit Gamma Air 5.00E+00 mRad 1.30E-05 2.60E-04 2.17E-05 4.34E-04 2.07E-05 4.14E-04 4.08E-06 8.16E-05 1.00E+01 5.94E-05 5.94E-04 Beta Air 1.00E+01 mRad 8.34E-06 8.34E-05 4.73E-06 4.73E-05 4.26E-06 4.26E-05 1.11E-06 1.11E-05 2.00E+01 1.84E-05 1.84E-04 NG Total Body 2.50E+00 mRem 8.62E-06 3.45E-04 1.46E-05 5.84E-04 1.39E-05 5.56E-04 2.75E-06 1.10E-04 5.00E+00 3.98E-05 3.98E-04 NG Skin 7.50E+00 mRem 1.84E-05 2.45E-04 2.64E-05 3.52E-04 2.50E-05 3.33E-04 5.08E-06 6.77E-05 1.50E+01 7.49E-05 7.49E-04 NNG Organ 7.50E+00 mRem 1.11E-02 1.48E-01 1.11E-02 1.48E-01 1.11E-02 1.48E-01 1.11E-02 1.48E-01 1.50E+01 4.44E-02 4.44E-01 Infant Receptor Quarterly Limit Units 1st Quarter

% of Limit 2nd Quarter

% of Limit 3rd Quarter

% of Limit 4th Quarter

% of Limit Annual Limit Annual

% of Limit Gamma Air 5.00E+00 mRad 1.30E-05 2.60E-04 2.17E-05 4.34E-04 2.07E-05 4.14E-04 4.08E-06 8.16E-05 1.00E+01 5.94E-05 5.94E-04 Beta Air 1.00E+01 mRad 8.34E-06 8.34E-05 4.73E-06 4.73E-05 4.26E-06 4.26E-05 1.11E-06 1.11E-05 2.00E+01 1.84E-05 1.84E-04 NG Total Body 2.50E+00 mRem 8.62E-06 3.45E-04 1.46E-05 5.84E-04 1.39E-05 5.56E-04 2.75E-06 1.10E-04 5.00E+00 3.98E-05 3.98E-04 NG Skin 7.50E+00 mRem 1.84E-05 2.45E-04 2.64E-05 3.52E-04 2.50E-05 3.33E-04 5.08E-06 6.77E-05 1.50E+01 7.49E-05 7.49E-04 NNG Organ 7.50E+00 mRem 1.28E-02 1.71E-01 9.11E-03 1.21E-01 7.80E-03 1.04E-01 1.10E-02 1.47E-01 1.50E+01 4.07E-02 4.07E-01 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 as detailed on page 4.

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2021)

RADIOLOGICAL IMPACT ON MAN MAXIMUM DOSES RESULTING FROM LIQUID RELEASES AND COMPLIANCE STATUS Page 42 of 75 Infant Receptor Quarterly Limit Units 1st Quarter

% of Limit 2nd Quarter

% of Limit 3rd Quarter

% of Limit 4th Quarter

% of Limit Annual Limit

% of Limit 10CFR50 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 1.00E+01 0.00 40CFR141 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 Child Receptor Quarterly Limit Units 1st Quarter

% of Limit 2nd Quarter

% of Limit 3rd Quarter

% of Limit 4th Quarter

% of Limit Annual Limit

% of Limit 10CFR50 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 1.00E+01 0.00 40CFR141 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 Teenager Receptor Quarterly Limit Units 1st Quarter

% of Limit 2nd Quarter

% of Limit 3rd Quarter

% of Limit 4th Quarter

% of Limit Annual Limit

% of Limit 10CFR50 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 1.00E+01 0.00 40CFR141 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 Adult Receptor Quarterly Limit Units 1st Quarter

% of Limit 2nd Quarter

% of Limit 3rd Quarter

% of Limit 4th Quarter

% of Limit Annual Limit

% of Limit 10CFR50 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 1.00E+01 0.00 40CFR141 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

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2021)

RADIOLOGICAL IMPACT ON MAN 10CFR20 / 40CFR190 Compliance Page 43 of 75 1st Quarter 2nd Quarter 3rd Quarter 4th Quarter Annual Annual

% Annual Dose Dose Dose Dose Dose Limit Limit (mRem)

(mRem)

(mRem/yr)

Unit 1 40CFR190 Compliance U1 DEx 9.65E-02 9.62E-02 7.18E-02 9.82E-02 3.63E-01 25 1.45 10CFR20 Compliance U1 DTot 1.11E-01 1.07E-01 8.29E-02 1.10E-01 4.11E-01 100 0.41 40CFR190 Compliance Bone 1.11E-02 1.11E-02 1.11E-02 1.11E-02 4.44E-02 25 0.18 Liver 2.26E-03 2.24E-03 2.25E-03 2.25E-03 9.00E-03 25 0.04 Thyroid 1.28E-02 9.11E-03 7.80E-03 1.10E-02 4.07E-02 75 0.05 Kidney 2.27E-03 2.25E-03 2.25E-03 2.26E-03 9.03E-03 25 0.04 Lung 2.24E-03 2.23E-03 2.24E-03 2.24E-03 8.95E-03 25 0.04 GI-LLI 2.24E-03 2.24E-03 2.24E-03 2.24E-03 8.96E-03 25 0.04 Skin 3.26E-05 2.50E-05 1.15E-06 1.50E-06 6.02E-05 25 0.00 Unit 2 40CFR190 Compliance U2 DEx 5.48E-02 7.72E-02 7.23E-02 9.84E-02 3.03E-01 25 1.21 10CFR20 Compliance U2 DTot 5.48E-02 7.72E-02 7.23E-02 9.84E-02 3.03E-01 100 0.30 40CFR190 Compliance Bone 0.00E+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 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 75 0.00 Kidney 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 25 0.00 Lung 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 25 0.00 GI-LLI 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 25 0.00 Skin 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 25 0.00

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2021)

ERRATA FROM PREVIOUS REPORTS Page 44 of 75

, ERRATA from Previous Reports

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2021)

ERRATA FROM PREVIOUS REPORTS REPORT YEAR: 2018 Page 45 of 75 ARERR Report Year:

2018 There were several errors discovered in the 2018 Annual Radioactive Effluent Release Report (ARERR):

1. During the V&V of the RACER database for Radiological Environmental Monitoring Program (REMP) and Radioactive Effluents Control (REC) data the RACER group reviewed all the REC data for 2018 to verify dose calculations. During this review they discovered that the GASEOUS EFFLUENTS ELEVATED RELEASE UNIT 1 AND UNIT 2 reported a release of 17.1 Ci of Xe-135m in Q4, which should have been reported as Xe-133m, and a release of 4.62E-4 Ci of Co-60 in Q3 which should have been 4.26E-4 Ci. (AR04349924)

2. Several quarterly composite updates for Standby Gas Treatment (SBGT) had erroneous strontium-89 data included in the database.

3. The second quarter composite update did not include data for strontium 89 for the Station Vent Stack (SVS).

4. The table displaying The Maximum Doses Resulting from Gaseous Releases and Compliance Status was revised, to add the annual doses. Previously, only the percent of the limit values were listed. In addition, the annual adult organ dose percent compliance changed from 0.696% to 0.209%

These changes had no significant impact to doses reported to the maximumly exposed individual and organ. The corrections are marked in red.

A. Fission & Activation Gases Unit Quarter 1 Quarter 2 Quarter 3 Quarter4 Est. Total Error %

1. Total Release Ci 1.51E+02 2.40E+02 3.69E+02 2.43E+02 2.50E+01

2. Average release rate for the period Ci/sec 1.94E+01 3.05E+01 4.64E+01 3.06E+01

3. Percent of ODCM limit B. Iodine

1. Total Iodine - 131 Ci 1.23E-02 9.23E-03 1.99E-02 5.98E-03 1.50E+01

2. Average release rate for the period Ci/sec 1.58E-03 1.17E-03 2.50E-03 7.52E-04

3. Percent of ODCM limit C. Particulates

1. Particulates with half-lives > 8 days Ci 1.11E-03 1.59E-03 1.72E-03 3.46E-03 2.28E-03 2.26E-03 3.50E+01

2. Average release rate for the period Ci/sec 1.42E-04 2.02E-04 2.18E-04 4.35E-04 2.87E-04

3. Percent of ODCM limit D. Tritium

1. Total Release Ci 5.75E+00 6.07E+00 1.30E+01 1.16E+00 1.50E+01

2. Average release rate for the period Ci/sec 7.39E-01 7.71E-01 1.63E-00 1.46E-00

3. Percent of ODCM limit E. Gross Alpha

1. Total Release Ci

<LLD

<LLD N/A

2. Average release rate for the period Ci/sec

<LLD

3. Percent of ODCM limit F. Carbon-14

1. Total Release Ci 8.62E+00 8.62E+00 8.62E+00 8.63E+00

2. Average release rate for the period Ci/sec 1.11E+00 1.10E+00 1.09E+00 1.09E+00

3. Percent of ODCM 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

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2021)

ERRATA FROM PREVIOUS REPORTS REPORT YEAR: 2018 Page 46 of 75 Nuclides Released Continuous Mode Batch Mode Unit Quarter Quarter Quarter Quarter Quarter Quarter Quarter Quarter 1

2 3

4 1

2 3

4 A. Fission gases Kr-85m Ci 7.35E+01 8.89E+01 1.05E+02 8.60E+01 N/A N/A N/A N/A Kr-87 Ci

<LLD

<LLD 3.00E+01

<LLD N/A N/A N/A N/A Kr-88 Ci 5.60E+01 1.02E+02 1.77E+02 1.12E+02 N/A N/A N/A N/A Xe-131m Ci

<LLD

<LLD N/A N/A N/A N/A Xe-133m Ci

<LLD

<LLD 9.35E-06

< LLD 1.71E+01 N/A N/A N/A N/A Xe-133 Ci 1.68E+01 4.87E+01 5.14E+01 2.65E+01 N/A N/A N/A N/A Xe-135 Ci 4.29E+00

<LLD 5.57E+00 1.35E+00 N/A N/A N/A N/A Xe-135m Ci

<LLD

<LLD 1.71E+01

<LLD N/A N/A N/A N/A Xe-138 Ci

<LLD

<LLD N/A N/A N/A N/A Ar-41 Ci 3.26E-02 5.57E-03 1.77E-02

<LLD N/A N/A N/A N/A Total for Period Ci 1.51E+02 2.40E+02 3.69E+02 2.43E+02 N/A N/A N/A N/A B. lodines I-131 Ci 1.23E-02 9.23E-03 1.99E-02 5.98E-03 N/A N/A N/A N/A I-132 Ci 3.07E-02 3.05E-02 6.71E-02 1.74E-02 N/A N/A N/A N/A I-133 Ci 4.60E-02 4.07E-02 8.68E-02 2.47E-02 N/A N/A N/A N/A I-134 Ci 3.90E-02 7.63E-03 5.37E-02

<LLD N/A N/A N/A N/A I-135 Ci 5.32E-02 4.49E-02 9.71E-02 2.26E-02 N/A N/A N/A N/A Total for Period Ci 1.82E-01 1.33E-01 3.25E-01 7.07E-02 N/A N/A N/A N/A Tot. I-131,I-133,I-135 Ci 1.12E-01 9.48E-02 2.04E-01 5.33E-02 N/A N/A N/A N/A C. Particulates Mn-54 Ci

<LLD

<LLD 8.97E-06 N/A N/A N/A N/A Fe-55 Ci

<LLD

<LLD N/A N/A N/A N/A Co-58 Ci

<LLD

<LLD 2.33E-04 N/A N/A N/A N/A Fe-59 Ci

<LLD

<LLD N/A N/A N/A N/A Co-60 Ci 2.47E-04 1.64E-04 4.62E-04 4.26E-04 9.95E-04 N/A N/A N/A N/A Zn-65 Ci

<LLD

<LLD 2.44E-04 N/A N/A N/A N/A Sr-89 Ci

<LLD

<LLD 1.30E-04 1.58E-04 3.74E-05 N/A N/A N/A N/A Mo-99 Ci

<LLD

<LLD 2.71E-05 N/A N/A N/A N/A Cs-134 Ci

<LLD

<LLD N/A N/A N/A N/A Cs-137 Ci

<LLD

<LLD N/A N/A N/A N/A Ba-140 Ci 3.60E-04 4.76E-04 1.35E-03 3.14E-04 N/A N/A N/A N/A La-140 Ci 5.06E-04 9.47E-04 1.53E-03 4.22E-04 N/A N/A N/A N/A Ce-141 Ci

<LLD

<LLD N/A N/A N/A N/A Total for Period Ci 1.11E-03 1.59E-03 1.72E-03 3.46E-03 3.93E-03 2.28E-03 N/A N/A N/A N/A D. Tritium H-3 Total for Period Ci 5.75E+00 6.07E+00 1.30E+01 1.16E+01 N/A N/A N/A N/A E. Gross Alpha Gross Alpha Total for Period Ci

<LLD

<LLD N/A N/A N/A N/A F. Carbon-14 C-14 Total for Period Ci 8.62E+00 8.62E+00 8.62E+00 8.63E+00 N/A N/A N/A N/A

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2021)

ERRATA FROM PREVIOUS REPORTS REPORT YEAR: 2018 Page 47 of 75 Infant Receptor Quarterly Limit Units 1st Quarter % of Limit 2nd Quarter % of Limit 3rd Quarter % of Limit 4th Quarter % of Limit Annual Limit Annual

% of Limit Gamma Air 5.00E+00 mRad 1.98E-03 0.040 3.49E-03 0.070 6.34E-03 0.127 3.82E-03 0.076 1.00E+01 1.56E-02 0.156 Beta Air 1.00E+01 mRad 9.05E-05 0.001 1.41E-04 0.001 2.96E-04 0.003 1.49E-04 0.001 2.00E+01 6.76E-04 0.003 NG Total Body 2.50E+00 mRem 1.32E-03 0.053 2.33E-03 0.093 4.23E-03 0.169 2.55E-03 0.102 5.00E+00 1.04E-02 0.209 NG Skin 7.50E+00 mRem 2.22E-03 0.030 3.92E-03 0.052 7.15E-03 0.095 4.28E-03 0.057 1.50E+01 1.76E-02 0.117 NNG Organ 7.50E+00 mRem 6.16E-02 0.821 4.68E-02 0.624 9.89E-02 1.32 3.09E-02 0.411 1.50E+01 2.38E-01 1.588 Child Receptor Quarterly Limit Units 1st Quarter % of Limit 2nd Quarter % of Limit 3rd Quarter % of Limit 4th Quarter % of Limit Annual Limit Annual

% of Limit Gamma Air 5.00E+00 mRad 1.98E-03 0.040 3.49E-03 0.070 6.34E-03 0.127 3.82E-03 0.076 1.00E+01 1.56E-02 0.156 Beta Air 1.00E+01 mRad 9.05E-05 0.001 1.41E-04 0.001 2.96E-04 0.003 1.49E-04 0.001 2.00E+01 6.76E-04 0.003 NG Total Body 2.50E+00 mRem 1.32E-03 0.053 2.33E-03 0.093 4.23E-03 0.169 2.55E-03 0.102 5.00E+00 1.04E-02 0.209 NG Skin 7.50E+00 mRem 2.22E-03 0.030 3.92E-03 0.052 7.15E-03 0.095 4.28E-03 0.057 1.50E+01 1.76E-02 0.117 NNG Organ 7.50E+00 mRem 2.55E-02 0.340 1.94E-02 0.259 4.10E-02 0.546 1.29E-02 0.172 1.50E+01 9.88E-02 0.659 Teenager Receptor Quarterly Limit Units 1st Quarter % of Limit 2nd Quarter % of Limit 3rd Quarter % of Limit 4th Quarter % of Limit Annual Limit Annual

% of Limit Gamma Air 5.00E+00 mRad 1.98E-03 0.040 3.49E-03 0.070 6.34E-03 0.127 3.82E-03 0.076 1.00E+01 1.56E-02 0.156 Beta Air 1.00E+01 mRad 9.05E-05 0.001 1.41E-04 0.001 2.96E-04 0.003 1.49E-04 0.001 2.00E+01 6.76E-04 0.003 NG Total Body 2.50E+00 mRem 1.32E-03 0.053 2.33E-03 0.093 4.23E-03 0.169 2.55E-03 0.102 5.00E+00 1.04E-02 0.209 NG Skin 7.50E+00 mRem 2.22E-03 0.030 3.92E-03 0.052 7.15E-03 0.095 4.28E-03 0.057 1.50E+01 1.76E-02 0.117 NNG Organ 7.50E+00 mRem 1.29E-02 0.171 9.76E-03 0.130 2.06E-02 0.275 6.50E-03 0.087 1.50E+01 4.97E-02 0.332 Adult Receptor Quarterly Limit Units 1st Quarter % of Limit 2nd Quarter % of Limit 3rd Quarter % of Limit 4th Quarter % of Limit Annual Limit Annual

% of Limit Gamma Air 5.00E+00 mRad 1.98E-03 0.040 3.49E-03 0.070 6.34E-03 0.127 3.82E-03 0.076 1.00E+01 1.56E-02 0.156 Beta Air 1.00E+01 mRad 9.05E-05 0.00 1.41E-04 0.001 2.96E-04 0.003 1.49E-04 0.001 2.00E+01 6.76E-04 0.003 NG Total Body 2.50E+00 mRem 1.32E-03 0.053 2.33E-03 0.093 4.23E-03 0.169 2.55E-03 0.102 5.00E+00 1.04E-02 0.209 NG Skin 7.50E+00 mRem 2.22E-03 0.030 3.92E-03 0.052 7.15E-03 0.095 4.28E-03 0.057 1.50E+01 1.76E-02 0.117 NNG Organ 7.50E+00 mRem 8.11E-02 0.108 6.15E-03 0.082 1.30E-02 0.174 4.12E-03 0.055 1.50E+01 3.14E-02 0.696 0.209

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2021)

ERRATA FROM PREVIOUS REPORTS REPORT YEAR: 2019 Page 48 of 75 ARERR Report Year:

2019 There were several errors discovered in the 2019 Annual Radioactive Effluent Release Report (ARERR).

1. The values for Kr-85m and Kr-88 for the second quarter were switched.

2. The second quarter composite update had erroneous data for strontium 89 for the Station Vent Stack (SVS) and incorrect composite dates.

3. The table displaying The Maximum Doses Resulting from Gaseous Releases and Compliance Status was revised, to add the annual doses. Previously, only the percent of the limit values were listed. Changes in organ dose was noted in the first, second, and fourth quarters for the teenager and adult. In addition, the annual teenager and adult organ dose percent compliance changed.

These changes had no significant impact to doses reported to the maximumly exposed individual and organ. The corrections are marked in red.

Nuclides Released Continuous Mode Batch Mode Unit Quarter Quarter Quarter Quarter Quarter Quarter Quarter Quarter 1

2 3

4 1

2 3

4 A. Fission gases Kr-85m Ci 5.01E+01 3.66E+01 4.44E+01 3.56E+01 4.82E+01 N/A N/A N/A N/A Kr-87 Ci 2.18E+00

<LLD

<LLD N/A N/A N/A N/A Kr-88 Ci 2.10E+01 4.44E+01 3.66E+01 3.10E+00 8.06E+00 N/A N/A N/A N/A Xe-131m Ci

<LLD

<LLD N/A N/A N/A N/A Xe-133m Ci

<LLD

<LLD N/A N/A N/A N/A Xe-133 Ci 7.48E+00

<LLD 5.18E+00 4.43E+00 N/A N/A N/A N/A Xe-135 Ci 2.48E+01

<LLD 5.45E-03 2.94E+00 N/A N/A N/A N/A Xe-135m Ci

<LLD

<LLD N/A N/A N/A N/A Xe-138 Ci

<LLD

<LLD N/A N/A N/A N/A Ar-41 Ci 6.48E-03

<LLD

<LLD 1.49E-02 N/A N/A N/A N/A Total for Period Ci 1.06E+02 8.09E+01 4.39E+01 6.37E+01 N/A N/A N/A N/A B. lodines I-131 Ci 1.64E-02 1.83E-03 1.90E-03 1.74E-03 N/A N/A N/A N/A I-132 Ci 3.21E-03 6.03E-04 1.14E-03

<LLD N/A N/A N/A N/A I-133 Ci 1.20E-02 6.17E-03 7.56E-03 5.52E-03 N/A N/A N/A N/A I-134 Ci

<LLD

<LLD N/A N/A N/A N/A I-135 Ci 3.89E-03

<LLD 1.30E-03

<LLD N/A N/A N/A N/A Total for Period Ci 3.55E-02 8.60E-03 1.19E-02 7.26E-03 N/A N/A N/A N/A Tot. I-131,I-133,I-135 Ci 3.22E-02 8.00E-03 1.08E-02 7.26E-03 N/A N/A N/A N/A C. Particulates Na-24 Ci 4.27E-04

<LLD

<LLD N/A N/A N/A N/A Mn-54 Ci 1.93E-05

<LLD 5.85E-05 1.60E-05 N/A N/A N/A N/A Fe-55 Ci

<LLD

<LLD 3N/A N/A N/A N/A Co-58 Ci 2.62E-04 3.03E-04 3.26E-04 2.37E-05 N/A N/A N/A N/A Fe-59 Ci

<LLD

<LLD N/A N/A N/A N/A Co-60 Ci 1.15E-03 1.26E-03 1.51E-03 3.50E-04 N/A N/A N/A N/A Zn-65 Ci 4.08E-04 5.54E-04 6.68E-04 7.89E-05 N/A N/A N/A N/A Zn-69m Ci 4.57E-04

<LLD

<LLD N/A N/A N/A N/A Sr-89 Ci

<LLD

<LLD 1.54E-04 3.85E-05 N/A N/A N/A N/A

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2021)

ERRATA FROM PREVIOUS REPORTS REPORT YEAR: 2019 Page 49 of 75 Sr-90 Ci

<LLD

<LLD N/A N/A N/A N/A Zr-95 Ci

<LLD 1.10E-05

<LLD

<LLD N/A N/A N/A N/A Mo-99 Ci 2.55E-05

<LLD 8.39E-05 9.78E-07 N/A N/A N/A N/A Cs-134 Ci

<LLD

<LLD N/A N/A N/A N/A Cs-137 Ci

<LLD

<LLD N/A N/A N/A N/A Ba-140 Ci 1.95E-04 9.76E-05 4.68E-04

<LLD N/A N/A N/A N/A La-140 Ci 8.14E-05 2.87E-05 4.06E-04 5.69E-05 N/A N/A N/A N/A Ce-141 Ci

<LLD

<LLD N/A N/A N/A N/A Ce-144 Ci

<LLD

<LLD N/A N/A N/A N/A Hf-181 Ci

<LLD 1.62E-05

<LLD

<LLD Total for Period Ci 3.03E-03 2.27E-03 3.68E-03 5.65E-04 N/A N/A N/A N/A D. Tritium Ci 3.71E+01 1.02E+01 1.07E+01 1.35E+01 N/A N/A N/A N/A E. Gross Alpha Ci

<LLD

<LLD N/A N/A N/A N/A F. Carbon-14 Ci 8.69E+00 8.69E+00 8.69E+00 8.68E+00 N/A N/A N/A N/A

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2021)

ERRATA FROM PREVIOUS REPORTS REPORT YEAR: 2019 Page 50 of 75 Infant Receptor Quarterly Limit Units 1st Quarter % of Limit 2nd Quarter % of Limit 3rd Quarter

% of Limit 4th Quarter % of Limit Annual Limit Annual

% of Limit Gamma Air 5.00E+00 mRad 8.91E-04 0.018 1.27E-03 0.025 1.71E-04 0.003 3.66E-04 0.007 1.00E+01 2.70E-03 0.027 Beta Air 1.00E+01 mRad 6.74E-05 0.001 5.22E-05 0.001 2.27E-05 0.000 3.50E-05 0.000 2.00E+01 1.77E-04 0.001 NG Total Body 2.50E+00 mRem 5.95E-04 0.024 8.46E-04 0.034 1.14E-04 0.005 2.45E-04 0.010 5.00E+00 1.80E-03 0.036 NG Skin 7.50E+00 mRem 1.02E-03 0.014 1.42E-03 0.019 2.00E-04 0.003 4.22E-04 0.056 1.50E+01 3.06E-03 0.020 NNG Organ 7.50E+00 mRem 7.94E-02 1.059 1.05E-02 0.140 1.09E-02 0.146 1.00E-02 0.133 1.50E+01 1.11E-01 0.739 Child Receptor Quarterly Limit Units 1st Quarter % of Limit 2nd Quarter % of Limit 3rd Quarter

% of Limit 4th Quarter % of Limit Annual Limit Annual

% of Limit Gamma Air 5.00E+00 mRad 8.91E-04 0.018 1.27E-03 0.025 1.71E-04 0.003 3.66E-04 0.007 1.00E+01 2.70E-03 0.027 Beta Air 1.00E+01 mRad 6.74E-05 0.001 5.22E-05 0.001 2.27E-05 0.000 3.50E-05 0.000 2.00E+01 1.77E-04 0.001 NG Total Body 2.50E+00 mRem 5.95E-04 0.024 8.46E-04 0.034 1.14E-04 0.005 2.45E-04 0.010 5.00E+00 1.80E-03 0.036 NG Skin 7.50E+00 mRem 1.02E-03 0.014 1.42E-03 0.019 2.00E-04 0.003 4.22E-04 0.056 1.50E+01 3.06E-03 0.020 NNG Organ 7.50E+00 mRem 3.29E-02 0.439 4.52E-03 0.060 4.71E-03 0.063 4.25E-03 0.057 1.50E+01 4.64E-02 0.309 Teenager Receptor Quarterly Limit Units 1st Quarter % of Limit 2nd Quarter % of Limit 3rd Quarter

% of Limit 4th Quarter % of Limit Annual Limit Annual

% of Limit Gamma Air 5.00E+00 mRad 8.91E-04 0.018 1.27E-03 0.025 1.71E-04 0.003 3.66E-04 0.007 1.00E+01 2.70E-03 0.027 Beta Air 1.00E+01 mRad 6.74E-05 0.001 5.22E-05 0.001 2.27E-05 0.000 3.50E-05 0.000 2.00E+01 1.77E-04 0.001 NG Total Body 2.50E+00 mRem 5.95E-04 0.024 8.46E-04 0.034 1.14E-04 0.005 2.45E-04 0.010 5.00E+00 1.80E-03 0.036 NG Skin 7.50E+00 mRem 1.02E-03 0.014 1.42E-03 0.019 2.00E-04 0.003 4.22E-04 0.056 1.50E+01 3.06E-03 0.020 NNG Organ 7.50E+00 mRem 1.09E-02 1.67E-02 0.146 0.222 4.71E-03 2.28E-03 0.063 0.030 2.39E-03 0.032 1.54E-03 2.10E-03 0.021 0.028 1.50E+01 2.35E-02 0.130 0.156 Adult Receptor Quarterly Limit Units 1st Quarter % of Limit 2nd Quarter % of Limit 3rd Quarter

% of Limit 4th Quarter % of Limit Annual Limit Annual

% of Limit Gamma Air 5.00E+00 mRad 8.91E-04 0.018 1.27E-03 0.025 1.71E-04 0.003 3.66E-04 0.007 1.00E+01 2.70E-03 0.027 Beta Air 1.00E+01 mRad 6.74E-05 0.001 5.22E-05 0.001 2.27E-05 0.000 3.50E-05 0.000 2.00E+01 1.77E-04 0.001 NG Total Body 2.50E+00 mRem 5.95E-04 0.024 8.46E-04 0.034 1.14E-04 0.005 2.45E-04 0.010 5.00E+00 1.80E-03 0.036 NG Skin 7.50E+00 mRem 1.02E-03 0.014 1.42E-03 0.019 2.00E-04 0.003 4.22E-04 0.056 1.50E+01 3.06E-03 0.020 NNG Organ 7.50E+00 mRem 1.00E-02 1.06E-02 0.133 0.141 4.25E-03 1.46E-03 0.057 0.019 2.10E-03 0.028 1.32E-03 0.018 1.50E+01 1.49E-02 0.118 0.099

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2021)

ERRATA FROM PREVIOUS REPORTS REPORT YEAR: 2020 Page 51 of 75 ARERR Report Year:

2020 There were several errors discovered in the 2020 Annual Radioactive Effluent Release Report (ARERR).

1. The reporting software that is used to produce Table 1A and Table 1B for the gaseous releases only produces those tables with particulate and iodine nuclides with half-life of greater than eight days. Other reporting software must be used to obtain all nuclides reported in the year.

2. The gaseous summary table report Particulates with half-lives > 8 days also includes the carbon-14 values. This number must be removed and reported separately.

These changes had no impact to doses reported to the maximumly exposed individual and organ. The corrections are marked in red.

A. Fission & Activation Gases Unit Quarter 1 Quarter 2 Quarter 3 Quarter4 Est. Total Error %

1. Total Release Ci 1.18E+02 7.58E+01 3.28E+01 2.30E+01 2.50E+01

2. Average release rate for the period

µCi/sec 1.50E+01 9.62E+00 4.16E+00 2.92E+00

3. Percent of ODCM limit B. Iodine

1. Total Iodine - 131 Ci 2.59E-03 2.12E-03 2.30E-03 1.78E-03 1.50E+01

2. Average release rate for the period

µCi/sec 3.28E-04 2.69E-04 2.92E-04 2.26E-04

3. Percent of ODCM limit C. Particulates

1. Particulates with half-lives > 8 days Ci 8.30E+00 6.87E-05 8.79E+00 1.52E-04 9.02E+00 4.20E-05 8.93E+00

<LLD 3.50E+01

2. Average release rate for the period

µCi/sec 1.05E+00 8.73E-06 1.12E+00 1.94E-05 1.14E+00 5.28E-06 1.13E+00 N/A

3. Percent of ODCM limit D. Tritium

1. Total Release Ci 1.36E+01 1.90E+01 1.69E+01 3.68E+01 1.50E+01

2. Average release rate for the period

µCi/sec 1.73E+00 2.41E+00 2.14E+00 4.67E+00

3. Percent of ODCM limit E. Gross Alpha

1. Total Release Ci

<LLD

<LLD N/A

2. Average release rate for the period

µCi/sec

<LLD

3. Percent of ODCM limit F. Carbon-14

1. Total Release Ci 8.30E+00 8.79E+00 9.02E+00 8.93E+00

2. Average release rate for the period

µCi/sec 1.06E+00 1.11E+00 1.14E+00 1.13E+00

3. Percent of ODCM 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

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2021)

ERRATA FROM PREVIOUS REPORTS REPORT YEAR: 2020 Page 52 of 75 Nuclides Released Continuous Mode Batch Mode Unit Quarter Quarter Quarter Quarter Quarter Quarter Quarter Quarter 1

2 3

4 1

2 3

4 A. Fission gases Ar-41 Ci 6.62E-03

<LLD

<LLD N/A N/A N/A N/A Kr-85m Ci 4.97E+01 3.78E+01 3.08E+01 1.67E+01 N/A N/A N/A N/A Kr-88 Ci 3.59E+01 2.19E+01 2.00E+00 6.31E+00 N/A N/A N/A N/A Xe-133 Ci 3.28E+01 1.61E+01

<LLD

<LLD N/A N/A N/A N/A Ci Ci Ci Ci Ci Ci Total for Period Ci 1.18E+02 7.58E+01 3.28E+01 2.30E+01 N/A N/A N/A N/A B. Iodines I-131 Ci 2.59E-03 2.12E-03 2.30E-03 1.78E-03 N/A N/A N/A N/A I-132 Ci

<LLD 3.34E-03 1.74E-03 1.45E-03 N/A N/A N/A N/A I-133 Ci 6.30E-03 8.08E-03 9.46E-03 7.28E-03 N/A N/A N/A N/A I-135 Ci 7.85E-04 3.81E-03 3.38E-03 3.19E-03 N/A N/A N/A N/A Ci Ci Total for Period Ci 9.67E-03 1.40E-02 1.74E-02 1.51E-02 1.69E-02 1.22E-02 1.37E-02 N/A N/A N/A N/A C. Particulates Co-60 Ci 6.86E-05 6.06E-05 4.20E-05

<LLD N/A N/A N/A N/A Ba-140 Ci

<LLD 9.18E-05

<LLD

<LLD N/A N/A N/A N/A La-140 Ci

<LLD

<LLD 4.24E-05 N/A N/A N/A N/A Ci Ci Ci Ci Ci Ci Ci Ci Ci Ci Ci Ci Total for Period Ci 6.86E-05 1.52E-04 4.20E-05

<LLD 4.24E+01 N/A N/A N/A N/A D. Tritium Ci 1.36E+01 1.90E+01 1.69E+01 3.68E+01 N/A N/A N/A N/A E. Gross Alpha Ci

<LLD

<LLD N/A N/A N/A N/A F. Carbon-14 Ci 8.30E+00 8.79E+00 9.02E+00 8.93E+00 N/A N/A N/A N/A

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2021)

METEOROLOGICAL DATA Page 53 of 75

, Meteorological Data

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2021)

METEOROLOGICAL DATA Page 54 of 75 The meteorological tower is 400 ft. high and is instrumented at three levels. Wind speed and direction are measured at 33 ft., 200 ft., and 375 ft. Ambient temperature is measured at 33 ft. Differential temperatures, referenced to 33 ft., are measured at 200 ft. and 375 ft. Precipitation data is measured at approximately 10 ft.

Joint frequency stability wind rose tables of wind direction, wind speed, and stability are routinely tabulated from hourly measurements. The quarterly and annual tables are included in this attachment.

The LaSalle Station meteorological monitoring program produced 78,345 hours0.00399 days 0.0958 hours 5.704365e-4 weeks 1.312725e-4 months of valid data out of a possible 78,840 parameter hours during 2021 (365 x 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months per day x 9 measured priority parameters), which represents an overall data recovery rate of 99.4%.

Table 1 Wind Direction Classes IF 348.75° WD 11.25° THEN Class is N

IF 11.25° WD 33.75° THEN Class is NNE IF 33.75° WD 56.25° THEN Class is NE IF 56.25° WD 78.75° THEN Class is ENE IF 78.75° WD 101.25° THEN Class is E

IF 101.25° WD 123.75° THEN Class is ESE IF 123.75° WD 146.25° THEN Class is SE IF 146.25° WD 168.75° THEN Class is SSE IF 168.75° WD 191.25° THEN Class is S

IF 191.25° WD 213.75° THEN Class is SSW IF 213.75° WD 236.25° THEN Class is SW IF 236.25° WD 258.75° THEN Class is WSW IF 258.75° WD 281.25° THEN Class is W

IF 281.25° WD 303.75° THEN Class is WNW IF 303.75° WD 326.25° THEN Class is NW IF 326.25° WD 348.75° THEN Class is NNW Table 2 Wind Speed Classes IF 0.0 mph WS 0.5 mph THEN Class is 1

IF 0.5 mph WS 3.5 mph THEN Class is 2

IF 3.5 mph WS 7.5 mph THEN Class is 3

IF 7.5 mph WS 12.5 mph THEN Class is 4

IF 12.5 mph WS 18.5 mph THEN Class is 5

IF 18.5 mph WS 24.5 mph THEN Class is 6

IF 24.5 mph WS THEN Class is 7

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2021)

METEOROLOGICAL DATA Page 55 of 75 Table 3 Atmospheric Stability Classes Class Differential Temperature Interval (in °C/100m)1 Differential Temperature Interval (in °F over the 200-33ft. range)2 Differential Temperature Interval (in °F over the 375-33ft. range)2 Extremely Unstable T <

-1.9 T < -1.8 T < -3.6 Moderately Unstable

-1.9 < T < -1.7

-1.8 < T < -1.6

-3.6 < T < -3.2 Slightly Unstable

-1.7 < T < -1.5

-1.6 < T < -1.4

-3.2 < T < -2.9 Neutral

-1.5 < T < -0.5

-1.4 < T < -0.5

-2.9 < T < -1.0 Slightly Stable

-0.5 < T < 1.5

-0.5 < T < 1.3

-1.0 < T < 2.8 Moderately Stable 1.5 < T < 4.0 1.3 < T < 3.6 2.8 < T < 7.5 Extremely Stable 4.0 < T 3.6 < T 7.5 < T Table 4 Data Recovery Summary 2021 Recovered Recovered Lost Percent Measurement Elevation Hours Percent Hours Changed Wind Speed 33 ft.

8751 99.9 9

0.1 Wind Speed 200 ft.

8533 97.4 227 2.7 Wind Speed 375 ft.

8549 97.6 211 2.5 Wind Direction 33 ft.

8752 99.9 8

0.1 Wind Direction 200 ft.

8752 99.9 8

0.1 Wind Direction 375 ft.

8752 99.9 8

0.1 Ambient Temperature 33 ft.

8752 99.9 8

0.1 Differential Temperature 200-33 ft.

8752 99.9 8

0.2 Differential Temperature 375-33 ft.

8752 99.9 8

0.7 Precipitation 10 ft.

8755 99.9 5

1.5 AVERAGE*

99.4

Average of priority parameters (all except precipitation) 1 from ANSI/ANS 2.5 2 ANSI/ANS 2.5 intervals scaled for instrument heights on the LaSalle meteorological tower

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2021)

METEOROLOGICAL DATA Page 56 of 75 LaSalle County Generating Station January-March 2021 33 ft. Wind Speed and Direction 200Ft-33Ft Delta-T (F)

Number of Observations = 2155 Values are Percent Occurrence SPEED ---------------------------------- WIND DIRECTION CLASSES ---------------------------------- --------- STABILITY CLASSES ----------

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

- N 0.05 0.00 0.05 0.00 0.23 0.00 0.00 0.05 0.19 0.00 0.05 0.00 0.00 0.14 0.05 0.00 0.79 0.79 3 SS 0.19 0.00 0.05 0.19 0.09 0.00 0.09 0.09 0.05 0.05 0.05 0.09 0.00 0.00 0.05 0.05 1.02 1.02 MS 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.05 0.09 0.00 0.05 0.00 0.05 0.00 0.05 0.05 0.37 0.37 ES 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.00 0.00 0.05 0.00 0.00 0.19 0.05 0.00 0.05 0.37 0.37 2.55 EU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 MU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.00 0.00 0.00 0.05 0.05 4 SU 0.00 0.05 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.00 0.00 0.05 0.05 0.00 0.00 0.00 0.19 0.19

- N 1.35 0.74 0.28 0.28 0.51 0.37 0.32 0.05 0.65 0.46 0.46 0.46 0.56 0.51 0.23 0.84 8.07 8.07 7 SS 0.93 0.60 0.46 0.14 0.56 0.23 0.51 0.23 0.19 0.23 0.09 0.14 0.23 0.74 0.42 0.93 6.64 6.64 MS 0.14 0.00 0.00 0.00 0.28 0.46 0.46 0.23 0.23 0.23 0.00 0.23 0.32 0.37 0.09 0.05 3.11 3.11 ES 0.00 0.00 0.00 0.00 0.14 0.32 0.56 0.23 0.28 0.09 0.14 0.23 0.23 0.46 0.00 0.00 2.69 2.69 20.74 EU 0.00 0.00 0.00 0.09 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.09 0.09 MU 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.00 0.05 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.09 0.09 8 SU 0.00 0.00 0.14 0.09 0.00 0.09 0.14 0.14 0.09 0.14 0.05 0.00 0.05 0.05 0.00 0.05 1.02 1.02

- N 3.94 0.84 1.53 0.70 0.74 0.37 0.70 0.42 0.32 0.23 0.42 1.07 2.46 2.65 1.62 3.85 21.86 21.86 1 SS 0.65 0.14 0.14 0.37 0.51 0.42 0.51 0.42 0.23 0.28 0.42 0.56 1.02 1.16 1.35 0.42 8.58 8.58 2 MS 0.00 0.00 0.00 0.05 0.42 0.23 0.37 0.19 0.32 0.42 0.23 0.79 0.32 0.60 0.42 0.00 4.36 4.36 ES 0.00 0.00 0.00 0.00 0.09 0.46 1.30 0.70 0.56 0.79 0.14 0.00 0.51 0.14 0.00 0.00 4.69 4.69 40.70 EU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.14 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.14 0.14 1 MU 0.00 0.00 0.00 0.05 0.00 0.00 0.00 0.00 0.14 0.14 0.00 0.05 0.00 0.14 0.00 0.00 0.51 0.51 3 SU 0.00 0.00 0.00 0.09 0.00 0.00 0.00 0.19 0.23 0.23 0.00 0.00 0.05 0.14 0.14 0.00 1.07 1.07

- N 1.39 0.32 1.35 0.14 0.42 0.14 0.37 0.14 0.32 0.37 0.32 0.79 0.70 1.39 0.60 4.27 13.04 13.04 1 SS 0.05 0.05 0.14 0.05 0.00 0.42 0.46 0.46 0.42 0.56 0.97 0.60 0.84 1.02 0.19 0.00 6.22 6.22 8 MS 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.19 0.19 0.46 0.70 0.46 0.23 0.00 0.00 0.00 2.27 2.27 ES 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.19 0.37 0.37 0.23 0.09 0.00 0.00 0.00 0.00 1.25 1.25 24.50

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2021)

METEOROLOGICAL DATA Page 57 of 75 LaSalle County Generating Station January-March 2021 33 ft. Wind Speed and Direction 200Ft-33Ft Delta-T (F)

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

CLASS N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL EU MU SU N SS MS ES TOTAL EU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.14 0.00 0.00 0.05 0.00 0.00 0.00 0.00 0.19 0.19 1 MU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.14 0.00 0.05 0.14 0.00 0.09 0.00 0.00 0.42 0.42 9 SU 0.00 0.00 0.00 0.05 0.00 0.00 0.00 0.00 0.05 0.00 0.00 0.05 0.05 0.14 0.00 0.00 0.32 0.32

- N 0.00 0.70 0.32 0.60 0.09 0.37 0.05 0.05 0.09 0.19 0.32 0.14 0.84 0.97 0.09 0.00 4.83 4.83 2 SS 0.00 0.00 0.00 0.00 0.05 0.14 0.37 0.42 0.74 0.32 0.23 0.00 0.56 0.28 0.00 0.00 3.11 3.11 4 MS 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.14 0.05 0.00 0.00 0.00 0.00 0.19 0.19 ES 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.09 0.00 0.00 0.00 0.00 0.00 0.00 0.09 0.09 9.14 EU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.09 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.09 0.09 G MU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.09 0.00 0.00 0.00 0.00 0.00 0.14 0.14 T SU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.09 0.05 0.05 0.00 0.00 0.00 0.05 0.00 0.23 0.23 N 0.00 0.00 0.05 0.09 0.19 0.00 0.00 0.05 0.05 0.14 0.00 0.00 0.09 0.14 0.14 0.00 0.93 0.93 2 SS 0.00 0.00 0.00 0.00 0.05 0.00 0.05 0.09 0.14 0.23 0.00 0.00 0.37 0.05 0.00 0.00 0.97 0.97 4 MS 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 ES 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 2.37 TOT 8.68 3.43 4.50 2.97 4.36 4.04 6.45 4.55 6.64 6.17 5.20 6.03 9.74 11.23 5.48 10.53 100.00 0.51 1.21 2.83 49.51 26.54 10.30 9.10 100.00 Wind Direction by Stability N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL -STABILITY CLASSES-0.00 0.00 0.00 0.09 0.00 0.00 0.00 0.00 0.37 0.00 0.00 0.05 0.00 0.00 0.00 0.00 0.51 Extremely Unstable 0.00 0.00 0.00 0.05 0.00 0.00 0.05 0.00 0.32 0.19 0.14 0.19 0.05 0.23 0.00 0.00 1.21 Moderately Unstable 0.00 0.05 0.14 0.23 0.00 0.09 0.14 0.32 0.51 0.42 0.09 0.09 0.19 0.32 0.19 0.05 2.83 Slightly Unstable 6.73 2.60 3.57 1.81 2.18 1.25 1.44 0.74 1.62 1.39 1.58 2.46 4.64 5.80 2.74 8.96 49.51 Neutral 1.81 0.79 0.79 0.74 1.25 1.21 2.00 1.72 1.76 1.67 1.76 1.39 3.02 3.25 2.00 1.39 26.54 Slightly Stable 0.14 0.00 0.00 0.05 0.70 0.70 0.93 0.65 0.84 1.11 1.11 1.53 0.93 0.97 0.56 0.09 10.30 Moderately Stable 0.00 0.00 0.00 0.00 0.23 0.79 1.90 1.11 1.21 1.39 0.51 0.32 0.93 0.65 0.00 0.05 9.10 Extremely Stable Wind Direction by Wind Speed N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL -WIND SPEED CLASSES-0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 C A L M 0.23 0.00 0.09 0.19 0.32 0.00 0.19 0.19 0.32 0.09 0.14 0.09 0.23 0.19 0.14 0.14 2.55 < 3.5 mph 2.41 1.39 0.74 0.42 1.48 1.39 1.86 0.74 1.39 1.02 0.70 1.11 1.44 2.09 0.74 1.81 20.74 3.6 - 7.5 mph 4.59 0.97 1.81 1.30 1.76 1.58 3.06 1.86 1.58 1.86 1.25 2.41 4.36 4.59 3.39 4.32 40.70 7.6 - 12.5 mph 1.44 0.37 1.48 0.32 0.42 0.56 0.88 1.16 1.81 2.13 2.23 2.00 1.81 2.69 0.93 4.27 24.50 12.6 - 18.5 mph 0.00 0.70 0.32 0.65 0.14 0.51 0.42 0.46 1.16 0.60 0.74 0.42 1.44 1.48 0.09 0.00 9.14 18.6 - 24.5 mph 0.00 0.00 0.05 0.09 0.23 0.00 0.05 0.14 0.37 0.46 0.14 0.00 0.46 0.19 0.19 0.00 2.37 > 24.5 mph

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2021)

METEOROLOGICAL DATA Page 58 of 75 LaSalle County Generating Station January-March 2021 375 ft. Wind Speed and Direction 375Ft-33Ft Delta-T (F)

Number of Observations = 1954 Values are Percent Occurrence SPEED ---------------------------------- WIND DIRECTION CLASSES ---------------------------------- --------- STABILITY CLASSES ----------

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

- N 0.26 0.20 0.00 0.05 0.00 0.00 0.00 0.10 0.05 0.00 0.05 0.05 0.10 0.05 0.00 0.10 1.02 1.02 3 SS 0.05 0.05 0.10 0.05 0.00 0.05 0.10 0.10 0.00 0.05 0.00 0.00 0.05 0.05 0.00 0.00 0.67 0.67 MS 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.00 0.00 0.05 0.00 0.00 0.00 0.00 0.00 0.00 0.10 0.10 ES 0.05 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.10 0.10 1.89 EU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 MU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 4 SU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

- N 0.31 0.36 0.20 0.26 0.20 0.10 0.26 0.05 0.00 0.20 0.10 0.15 0.26 0.00 0.31 0.26 3.02 3.02 7 SS 0.00 0.26 0.26 0.10 0.10 0.00 0.00 0.05 0.00 0.05 0.41 0.05 0.00 0.00 0.05 0.10 1.43 1.43 MS 0.05 0.00 0.05 0.05 0.05 0.05 0.15 0.10 0.10 0.05 0.10 0.05 0.15 0.05 0.05 0.00 1.07 1.07 ES 0.00 0.00 0.00 0.05 0.00 0.00 0.00 0.00 0.05 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.10 0.10 5.63 EU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 MU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 8 SU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

- N 1.28 1.23 0.92 0.77 0.67 0.20 0.15 0.56 0.26 0.05 0.05 0.36 0.87 1.43 1.59 1.28 11.67 11.67 1 SS 0.61 0.31 0.26 0.41 0.10 0.20 0.31 0.41 0.20 0.10 0.15 0.00 0.15 0.51 0.51 0.20 4.45 4.45 2 MS 0.00 0.00 0.00 0.00 0.10 0.00 0.41 0.10 0.51 0.10 0.10 0.15 0.10 0.05 0.31 0.00 1.94 1.94 ES 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.00 0.05 0.05 18.12 EU 0.00 0.00 0.00 0.05 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.05 1 MU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 3 SU 0.00 0.00 0.05 0.05 0.00 0.00 0.00 0.00 0.05 0.00 0.00 0.00 0.00 0.15 0.05 0.00 0.36 0.36

- N 2.61 1.13 1.23 0.26 0.82 0.36 0.61 0.51 0.67 0.82 0.46 1.02 1.84 1.79 2.10 2.61 18.83 18.83 1 SS 0.56 0.67 0.20 0.36 0.36 0.15 0.61 0.46 0.31 0.31 0.72 0.51 0.87 1.07 0.72 0.51 8.39 8.39 8 MS 0.15 0.05 0.00 0.00 0.05 0.20 0.56 0.46 0.31 0.15 0.10 0.15 0.10 0.51 0.26 0.26 3.33 3.33 ES 0.00 0.00 0.00 0.00 0.00 0.10 0.26 0.05 0.20 0.00 0.05 0.00 0.00 0.00 0.00 0.05 0.72 0.72 31.68

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2021)

METEOROLOGICAL DATA Page 59 of 75 LaSalle County Generating Station January-March 2021 375 ft. Wind Speed and Direction 375Ft-33Ft Delta-T (F)

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

CLASS N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL EU MU SU N SS MS ES TOTAL EU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 1 MU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 9 SU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.15 0.00 0.00 0.15 0.05 0.05 0.00 0.00 0.41 0.41

- N 1.28 0.00 1.02 0.46 0.15 0.05 0.31 0.05 0.51 0.46 0.61 0.61 0.46 1.13 0.92 1.64 9.67 9.67 2 SS 0.20 0.41 0.10 0.00 0.10 0.20 0.46 0.31 0.41 0.56 0.15 0.46 0.61 0.97 0.20 0.20 5.37 5.37 4 MS 0.05 0.00 0.00 0.00 0.00 0.05 0.67 0.31 0.15 0.51 0.26 0.10 0.05 0.20 0.10 0.10 2.56 2.56 ES 0.00 0.00 0.00 0.00 0.00 0.00 0.46 0.61 0.41 0.20 0.10 0.00 0.00 0.00 0.00 0.00 1.79 1.79 19.81 EU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.10 0.00 0.00 0.10 0.10 G MU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.15 0.00 0.00 0.00 0.00 0.20 0.15 0.00 0.51 0.51 T SU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.10 0.00 0.10 0.05 0.05 0.15 0.10 0.00 0.56 0.56 N 0.26 0.87 1.28 0.82 0.41 0.41 0.31 0.20 0.61 0.51 0.26 0.41 1.69 1.74 0.41 0.05 10.24 10.24 2 SS 0.00 0.05 0.00 0.00 0.05 0.10 0.87 0.72 1.69 0.82 1.43 0.72 0.77 0.77 0.15 0.00 8.14 8.14 4 MS 0.00 0.05 0.00 0.00 0.00 0.00 0.10 0.15 0.36 0.56 0.41 0.72 0.31 0.00 0.00 0.00 2.66 2.66 ES 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.10 0.31 0.20 0.00 0.00 0.00 0.00 0.00 0.00 0.67 0.67 22.88 TOT 7.73 5.63 5.68 3.74 3.17 2.25 6.70 5.42 7.63 5.78 5.63 5.73 8.50 11.00 8.03 7.37 100.00 0.15 0.51 1.33 54.45 28.45 11.67 3.43 100.00 Wind Direction by Stability N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL -STABILITY CLASSES-0.00 0.00 0.00 0.05 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.10 0.00 0.00 0.15 Extremely Unstable 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.15 0.00 0.00 0.00 0.00 0.20 0.15 0.00 0.51 Moderately Unstable 0.00 0.00 0.05 0.05 0.00 0.00 0.00 0.00 0.31 0.00 0.10 0.20 0.10 0.36 0.15 0.00 1.33 Slightly Unstable 5.99 3.79 4.66 2.61 2.25 1.13 1.64 1.48 2.10 2.05 1.54 2.61 5.22 6.14 5.32 5.94 54.45 Neutral 1.43 1.74 0.92 0.92 0.72 0.72 2.35 2.05 2.61 1.89 2.87 1.74 2.46 3.38 1.64 1.02 28.45 Slightly Stable 0.26 0.10 0.05 0.05 0.20 0.31 1.94 1.13 1.43 1.43 0.97 1.18 0.72 0.82 0.72 0.36 11.67 Moderately Stable 0.05 0.00 0.00 0.05 0.00 0.10 0.77 0.77 1.02 0.41 0.15 0.00 0.00 0.00 0.05 0.05 3.43 Extremely Stable Wind Direction by Wind Speed N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL -WIND SPEED CLASSES-0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 C A L M 0.36 0.26 0.10 0.10 0.00 0.05 0.15 0.20 0.10 0.10 0.05 0.05 0.15 0.10 0.00 0.10 1.89 < 3.5 mph 0.36 0.61 0.51 0.46 0.36 0.15 0.41 0.20 0.15 0.31 0.61 0.26 0.41 0.05 0.41 0.36 5.63 3.6 - 7.5 mph 1.89 1.54 1.18 1.18 0.87 0.41 0.87 1.07 0.97 0.26 0.31 0.51 1.13 2.00 2.46 1.48 18.12 7.6 - 12.5 mph 3.33 1.84 1.48 0.72 1.23 0.82 2.05 1.48 1.54 1.28 1.33 1.69 2.81 3.53 3.12 3.43 31.68 12.6 - 18.5 mph 1.54 0.41 1.13 0.46 0.26 0.31 1.89 1.28 1.64 1.74 1.13 1.33 1.18 2.35 1.23 1.94 19.81 18.6 - 24.5 mph 0.26 0.97 1.28 0.82 0.46 0.51 1.33 1.18 3.22 2.10 2.20 1.89 2.81 2.97 0.82 0.05 22.88 > 24.5 mph

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2021)

METEOROLOGICAL DATA Page 60 of 75 LaSalle County Generating Station April-June 2021 33 ft. Wind Speed and Direction 200Ft-33Ft Delta-T (F)

Number of Observations = 2171 Values are Percent Occurrence SPEED ---------------------------------- WIND DIRECTION CLASSES ---------------------------------- --------- STABILITY CLASSES ----------

CLASS N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL EU MU SU N SS MS ES TOTAL EU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 MU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 C SU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 A N 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 L SS 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 M MS 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 ES 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 EU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 MU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.05 1 SU 0.00 0.00 0.00 0.00 0.09 0.00 0.09 0.05 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.23 0.23

- N 0.05 0.28 0.18 0.23 0.37 0.28 0.37 0.09 0.00 0.18 0.05 0.09 0.18 0.18 0.23 0.05 2.81 2.81 3 SS 0.23 0.37 0.23 0.78 1.06 0.46 0.28 0.41 0.09 0.05 0.23 0.09 0.14 0.37 0.05 0.14 4.97 4.97 MS 0.32 0.09 0.32 0.88 1.01 0.60 0.05 0.00 0.14 0.00 0.00 0.28 0.32 0.32 0.14 0.18 4.65 4.65 ES 0.09 0.18 0.23 0.51 0.78 0.23 0.09 0.05 0.05 0.05 0.09 0.09 0.18 0.46 0.41 0.41 3.92 3.92 16.63 EU 0.09 0.23 0.18 0.09 0.09 0.00 0.00 0.00 0.00 0.00 0.05 0.09 0.00 0.14 0.09 0.09 1.15 1.15 MU 0.00 0.18 0.28 0.18 0.05 0.09 0.05 0.14 0.18 0.05 0.14 0.14 0.05 0.05 0.41 0.14 2.12 2.12 4 SU 0.23 0.05 0.32 0.28 0.05 0.05 0.09 0.14 0.14 0.41 0.18 0.09 0.23 0.37 0.23 0.05 2.90 2.90

- N 1.11 0.46 0.88 1.38 0.69 0.78 0.92 1.01 0.97 0.64 0.74 0.51 0.69 0.51 0.46 0.51 12.25 12.25 7 SS 0.74 0.41 0.41 0.18 0.37 0.55 1.20 1.24 1.24 0.78 0.60 0.78 0.83 0.32 0.23 0.18 10.09 10.09 MS 0.09 0.05 0.00 0.09 0.32 0.37 0.18 0.28 0.23 0.18 0.05 0.18 0.23 0.46 0.14 0.00 2.86 2.86 ES 0.00 0.00 0.00 0.00 0.00 0.05 0.00 0.09 0.05 0.09 0.18 0.09 0.09 0.05 0.00 0.00 0.69 0.69 32.06 EU 0.51 0.09 0.32 0.09 0.00 0.00 0.00 0.00 0.32 0.18 0.09 0.28 0.37 0.14 0.18 0.28 2.86 2.86 MU 0.18 0.09 0.09 0.05 0.00 0.00 0.00 0.05 0.05 0.14 0.28 0.09 0.14 0.09 0.09 0.05 1.38 1.38 8 SU 0.18 0.05 0.14 0.18 0.05 0.00 0.05 0.14 0.28 0.18 0.51 0.23 0.05 0.18 0.09 0.05 2.35 2.35

- N 0.60 1.01 1.01 1.01 0.09 0.09 0.32 0.78 2.21 1.52 2.16 0.55 0.64 0.55 0.41 1.61 14.60 14.60 1 SS 0.09 0.00 0.05 0.05 0.18 0.18 0.37 0.55 1.24 0.83 1.06 0.51 0.78 0.32 0.55 0.28 7.05 7.05 2 MS 0.00 0.00 0.00 0.00 0.14 0.18 0.05 0.09 0.23 0.46 0.46 0.28 0.46 0.05 0.00 0.00 2.40 2.40 ES 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.14 0.74 0.41 0.28 0.55 0.00 0.00 0.00 0.00 2.12 2.12 32.75 EU 0.05 0.05 0.00 0.00 0.00 0.00 0.00 0.00 0.09 0.09 0.18 0.28 0.00 0.05 0.00 0.00 0.78 0.78 1 MU 0.18 0.00 0.05 0.00 0.00 0.00 0.00 0.00 0.28 0.14 0.37 0.09 0.14 0.09 0.00 0.05 1.38 1.38 3 SU 0.28 0.00 0.05 0.00 0.00 0.00 0.00 0.00 0.18 0.37 0.14 0.05 0.32 0.51 0.05 0.28 2.21 2.21

- N 0.18 0.05 0.55 0.37 0.41 0.00 0.05 0.09 0.69 1.20 0.97 0.18 0.83 1.01 0.55 0.55 7.69 7.69 1 SS 0.00 0.00 0.00 0.00 0.05 0.00 0.05 0.18 0.18 0.60 0.23 0.14 0.09 0.09 0.05 0.00 1.66 1.66 8 MS 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.00 0.14 0.32 0.28 0.28 0.00 0.00 0.00 0.00 1.06 1.06 ES 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.05 14.83

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2021)

METEOROLOGICAL DATA Page 61 of 75 LaSalle County Generating Station April-June 2021 33 ft. Wind Speed and Direction 200Ft-33Ft Delta-T (F)

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

CLASS N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL EU MU SU N SS MS ES TOTAL EU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.37 0.18 0.05 0.05 0.00 0.00 0.00 0.69 0.69 1 MU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.14 0.14 0.23 0.00 0.14 0.00 0.00 0.00 0.64 0.64 9 SU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.00 0.00 0.14 0.05 0.09 0.00 0.00 0.00 0.32 0.32

- N 0.00 0.00 0.00 0.00 0.09 0.00 0.05 0.05 0.09 0.14 0.18 0.05 0.00 0.05 0.00 0.14 0.83 0.83 2 SS 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.41 0.05 0.00 0.00 0.00 0.00 0.00 0.46 0.46 4 MS 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 ES 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 2.95 EU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.18 0.05 0.09 0.00 0.00 0.00 0.00 0.00 0.37 0.37 G MU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.05 0.00 0.00 0.00 0.00 0.00 0.09 0.09 T SU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.05 0.05 0.00 0.00 0.00 0.00 0.14 0.14 N 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.09 0.00 0.05 0.00 0.00 0.00 0.00 0.14 0.14 2 SS 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.00 0.00 0.00 0.00 0.05 0.05 4 MS 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 ES 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.78 TOT 5.20 3.64 5.30 6.36 5.90 3.92 4.28 5.67 10.23 10.23 10.27 6.22 7.05 6.36 4.38 5.02 100.00 5.85 5.67 8.15 38.32 24.27 10.96 6.77 100.00 Wind Direction by Stability N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL -STABILITY CLASSES-0.64 0.37 0.51 0.18 0.09 0.00 0.00 0.05 0.64 0.69 0.60 0.69 0.41 0.32 0.28 0.37 5.85 Extremely Unstable 0.37 0.28 0.41 0.23 0.05 0.09 0.05 0.18 0.69 0.51 1.06 0.32 0.46 0.23 0.51 0.23 5.67 Moderately Unstable 0.69 0.09 0.51 0.46 0.18 0.05 0.23 0.37 0.60 1.01 1.01 0.46 0.69 1.06 0.37 0.37 8.15 Slightly Unstable 1.93 1.80 2.63 2.99 1.66 1.15 1.70 2.03 3.96 3.78 4.10 1.43 2.35 2.30 1.66 2.86 38.32 Neutral 1.06 0.78 0.69 1.01 1.66 1.20 1.89 2.40 2.76 2.67 2.16 1.57 1.84 1.11 0.88 0.60 24.27 Slightly Stable 0.41 0.14 0.32 0.97 1.47 1.15 0.32 0.37 0.74 0.97 0.78 1.01 1.01 0.83 0.28 0.18 10.96 Moderately Stable 0.09 0.18 0.23 0.51 0.78 0.28 0.09 0.28 0.83 0.60 0.55 0.74 0.28 0.51 0.41 0.41 6.77 Extremely Stable Wind Direction by Wind Speed N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL -WIND SPEED CLASSES-0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 C A L M 0.69 0.92 0.97 2.40 3.32 1.57 0.88 0.60 0.32 0.28 0.37 0.55 0.83 1.34 0.83 0.78 16.63 < 3.5 mph 2.26 1.38 2.07 2.21 1.57 1.89 2.44 2.90 2.81 2.16 1.93 1.89 2.12 1.89 1.57 0.97 32.06 3.6 - 7.5 mph 1.57 1.24 1.61 1.38 0.46 0.46 0.78 1.75 5.07 3.73 4.84 2.49 2.44 1.34 1.34 2.26 32.75 7.6 - 12.5 mph 0.69 0.09 0.64 0.37 0.46 0.00 0.14 0.28 1.57 2.76 2.16 1.01 1.38 1.75 0.64 0.88 14.83 12.6 - 18.5 mph 0.00 0.00 0.00 0.00 0.09 0.00 0.05 0.09 0.28 1.06 0.78 0.14 0.28 0.05 0.00 0.14 2.95 18.6 - 24.5 mph 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.18 0.23 0.18 0.14 0.00 0.00 0.00 0.00 0.78 > 24.5 mph

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2021)

METEOROLOGICAL DATA Page 62 of 75 LaSalle County Generating Station April-June 2021 375 ft. Wind Speed and Direction 375Ft-33Ft Delta-T (F)

Number of Observations = 2181 Values are Percent Occurrence SPEED ---------------------------------- WIND DIRECTION CLASSES ---------------------------------- --------- STABILITY CLASSES ----------

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

- N 0.00 0.09 0.05 0.09 0.18 0.28 0.09 0.14 0.09 0.05 0.09 0.18 0.09 0.05 0.09 0.09 1.65 1.65 3 SS 0.00 0.05 0.00 0.09 0.05 0.00 0.14 0.00 0.00 0.05 0.00 0.00 0.00 0.14 0.05 0.00 0.55 0.55 MS 0.00 0.00 0.00 0.05 0.00 0.00 0.00 0.00 0.05 0.05 0.18 0.14 0.05 0.05 0.05 0.05 0.64 0.64 ES 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 2.84 EU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 MU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.00 0.00 0.00 0.00 0.00 0.05 0.05 4 SU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

- N 0.83 0.60 0.50 1.15 0.60 0.46 0.64 0.50 0.87 0.32 0.46 0.78 0.46 0.28 0.41 0.32 9.17 9.17 7 SS 0.05 0.28 0.28 0.83 0.37 0.64 0.60 0.60 0.46 0.73 0.55 0.14 0.28 0.09 0.14 0.05 6.05 6.05 MS 0.09 0.28 0.23 0.14 0.09 0.14 0.23 0.18 0.05 0.14 0.14 0.18 0.09 0.14 0.23 0.09 2.43 2.43 ES 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.14 0.05 0.00 0.23 0.23 17.93 EU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 MU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 8 SU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

- N 1.24 1.01 0.60 1.42 0.41 0.50 0.28 0.28 1.01 1.28 0.87 0.83 0.83 0.41 0.23 0.73 11.92 11.92 1 SS 0.50 0.55 0.73 0.55 0.78 0.46 0.60 0.37 1.24 1.19 0.55 0.50 0.87 0.55 0.37 0.23 10.04 10.04 2 MS 0.05 0.18 0.18 0.05 0.00 0.14 0.28 0.18 0.18 0.23 0.14 0.09 0.32 0.09 0.05 0.00 2.15 2.15 ES 0.00 0.00 0.05 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.09 0.18 0.09 0.14 0.05 0.00 0.60 0.60 24.71 EU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 1 MU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 3 SU 0.09 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.14 0.05 0.00 0.00 0.00 0.09 0.05 0.09 0.55 0.55

- N 1.10 0.50 0.96 1.01 0.41 0.46 0.23 0.50 0.96 1.38 1.33 1.05 0.83 0.96 1.28 1.51 14.49 14.49 1 SS 0.41 0.46 0.55 0.14 0.69 0.92 0.69 1.56 2.02 1.88 0.96 0.55 0.50 0.92 0.50 0.46 13.20 13.20 8 MS 0.05 0.09 0.05 0.00 0.00 0.05 0.14 0.14 0.32 0.46 0.32 0.41 0.28 0.14 0.28 0.05 2.75 2.75 ES 0.00 0.00 0.05 0.00 0.00 0.00 0.00 0.00 0.05 0.00 0.00 0.14 0.18 0.00 0.00 0.00 0.41 0.41 31.41

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2021)

METEOROLOGICAL DATA Page 63 of 75 LaSalle County Generating Station April-June 2021 375 ft. Wind Speed and Direction 375Ft-33Ft Delta-T (F)

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

CLASS N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL EU MU SU N SS MS ES TOTAL EU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 1 MU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.18 0.00 0.00 0.00 0.18 0.18 9 SU 0.09 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.09 0.14 0.28 0.05 0.28 0.14 0.00 0.00 1.05 1.05

- N 0.46 0.23 0.87 0.41 0.32 0.00 0.14 0.32 1.15 1.19 0.69 0.55 0.69 1.05 0.73 0.28 9.08 9.08 2 SS 0.05 0.00 0.09 0.00 0.05 0.18 0.14 0.46 1.15 0.96 0.64 0.28 0.32 0.46 0.18 0.37 5.32 5.32 4 MS 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.00 0.28 0.55 0.46 0.14 0.28 0.00 0.00 0.00 1.74 1.74 ES 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.09 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.09 0.09 17.47 EU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.09 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.09 0.09 G MU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.09 0.23 0.09 0.05 0.00 0.00 0.00 0.00 0.50 0.50 T SU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.14 0.28 0.23 0.05 0.00 0.00 0.00 0.00 0.69 0.69 N 0.00 0.00 0.00 0.05 0.00 0.00 0.00 0.05 0.37 0.37 0.32 0.14 0.00 0.05 0.09 0.05 1.47 1.47 2 SS 0.00 0.00 0.00 0.00 0.00 0.00 0.09 0.05 0.28 0.87 0.60 0.05 0.00 0.00 0.00 0.00 1.93 1.93 4 MS 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.09 0.32 0.18 0.23 0.05 0.05 0.00 0.00 0.96 0.96 ES 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 5.64 TOT 5.00 4.31 5.18 5.96 3.94 4.22 4.31 5.46 11.23 12.70 9.22 6.69 6.69 5.91 4.81 4.36 100.00 0.09 0.73 2.29 47.78 37.09 10.68 1.33 100.00 Wind Direction by Stability N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL -STABILITY CLASSES-0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.09 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.09 Extremely Unstable 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.09 0.23 0.14 0.05 0.18 0.00 0.00 0.00 0.73 Moderately Unstable 0.18 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.37 0.46 0.50 0.09 0.28 0.23 0.05 0.09 2.29 Slightly Unstable 3.62 2.43 2.98 4.13 1.93 1.70 1.38 1.79 4.45 4.59 3.76 3.53 2.89 2.80 2.84 2.98 47.78 Neutral 1.01 1.33 1.65 1.60 1.93 2.20 2.25 3.03 5.14 5.69 3.30 1.51 1.97 2.15 1.24 1.10 37.09 Slightly Stable 0.18 0.55 0.46 0.23 0.09 0.32 0.69 0.55 0.96 1.74 1.42 1.19 1.05 0.46 0.60 0.18 10.68 Moderately Stable 0.00 0.00 0.09 0.00 0.00 0.00 0.00 0.00 0.14 0.00 0.09 0.32 0.32 0.28 0.09 0.00 1.33 Extremely Stable Wind Direction by Wind Speed N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL -WIND SPEED CLASSES-0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 C A L M 0.00 0.14 0.05 0.23 0.23 0.28 0.23 0.14 0.14 0.14 0.28 0.32 0.14 0.23 0.18 0.14 2.84 < 3.5 mph 0.96 1.15 1.01 2.11 1.05 1.24 1.47 1.28 1.38 1.19 1.19 1.10 0.87 0.64 0.83 0.46 17.93 3.6 - 7.5 mph 1.79 1.74 1.56 2.02 1.19 1.10 1.15 0.83 2.43 2.71 1.65 1.60 2.11 1.19 0.69 0.96 24.71 7.6 - 12.5 mph 1.65 1.05 1.60 1.15 1.10 1.42 1.05 2.25 3.48 3.76 2.61 2.15 1.79 2.11 2.11 2.11 31.41 12.6 - 18.5 mph 0.60 0.23 0.96 0.41 0.37 0.18 0.32 0.78 2.75 2.84 2.06 1.01 1.74 1.65 0.92 0.64 17.47 18.6 - 24.5 mph 0.00 0.00 0.00 0.05 0.00 0.00 0.09 0.18 1.05 2.06 1.42 0.50 0.05 0.09 0.09 0.05 5.64 > 24.5 mph

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2021)

METEOROLOGICAL DATA Page 64 of 75 LaSalle County Generating Station July-September.2021 33 ft. Wind Speed and Direction 200Ft-33Ft Delta-T (F)

Number of Observations = 2208 Values are Percent Occurrence SPEED ---------------------------------- WIND DIRECTION CLASSES ---------------------------------- --------- STABILITY CLASSES ----------

CLASS N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL EU MU SU N SS MS ES TOTAL EU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 MU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 C SU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 A N 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 L SS 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 M MS 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 ES 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 EU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 MU 0.00 0.00 0.05 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.05 1 SU 0.05 0.00 0.00 0.09 0.05 0.00 0.00 0.00 0.05 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.27 0.27

- N 0.23 0.14 0.18 0.54 0.32 0.09 0.23 0.05 0.05 0.05 0.00 0.14 0.05 0.14 0.32 0.36 2.85 2.85 3 SS 0.27 0.32 0.32 0.63 0.59 0.41 0.14 0.14 0.00 0.05 0.09 0.09 0.23 0.36 0.32 0.23 4.17 4.17 MS 0.18 0.05 0.14 0.05 0.32 0.18 0.09 0.09 0.18 0.18 0.09 0.09 0.27 0.14 0.23 0.05 2.31 2.31 ES 0.05 0.05 0.00 0.14 0.09 0.05 0.14 0.09 0.05 0.00 0.00 0.14 0.27 0.54 0.27 0.18 2.04 2.04 11.68 EU 0.00 0.05 0.09 0.05 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.09 0.00 0.00 0.32 0.32 MU 0.05 0.14 0.05 0.00 0.09 0.00 0.00 0.00 0.00 0.09 0.05 0.36 0.41 0.23 0.27 0.05 1.77 1.77 4 SU 0.09 0.14 0.27 0.18 0.23 0.05 0.14 0.09 0.27 0.14 0.14 0.18 0.50 0.41 0.32 0.14 3.26 3.26

- N 1.27 1.27 2.85 2.49 1.04 0.50 0.41 0.32 0.45 0.50 0.54 0.63 1.00 0.68 0.41 1.18 15.53 15.53 7 SS 1.22 1.13 0.41 0.86 0.59 0.45 0.27 0.72 0.86 0.59 1.27 1.04 0.72 0.41 0.59 0.63 11.78 11.78 MS 0.36 0.05 0.00 0.32 1.13 0.59 0.54 0.50 1.13 1.09 0.32 0.59 0.59 0.68 0.27 0.09 8.24 8.24 ES 0.00 0.00 0.00 0.14 0.77 0.72 0.54 0.91 0.68 0.50 0.54 0.18 0.41 0.59 0.00 0.00 5.98 5.98 46.88 EU 0.00 0.05 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.23 0.36 0.05 0.00 0.00 0.00 0.72 0.72 MU 0.00 0.09 0.18 0.14 0.05 0.05 0.05 0.00 0.23 0.36 0.36 0.27 0.09 0.18 0.05 0.00 2.08 2.08 8 SU 0.14 0.00 0.27 0.23 0.18 0.05 0.05 0.23 0.41 0.77 1.13 0.23 0.32 0.27 0.09 0.05 4.39 4.39

- N 0.50 0.23 1.45 0.23 0.36 0.32 0.59 0.82 1.40 1.18 1.95 0.63 0.36 0.45 0.32 0.95 11.73 11.73 1 SS 0.14 0.36 0.36 1.04 0.18 0.00 0.05 0.50 1.00 1.90 1.59 0.59 0.09 0.36 0.50 0.36 9.01 9.01 2 MS 0.00 0.00 0.00 0.27 0.32 0.00 0.00 0.05 0.41 0.27 0.63 0.36 0.14 0.05 0.05 0.05 2.58 2.58 ES 0.00 0.00 0.00 0.05 0.09 0.00 0.00 0.14 0.18 0.05 0.50 0.18 0.00 0.18 0.00 0.00 1.36 1.36 31.88 EU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.05 0.00 0.00 0.00 0.00 0.00 0.09 0.09 1 MU 0.05 0.00 0.00 0.00 0.05 0.00 0.00 0.00 0.00 0.09 0.14 0.18 0.05 0.05 0.00 0.00 0.59 0.59 3 SU 0.00 0.00 0.00 0.05 0.00 0.00 0.00 0.00 0.18 0.14 0.32 0.50 0.27 0.18 0.18 0.14 1.95 1.95

- N 0.14 0.00 0.00 0.09 0.00 0.00 0.05 0.05 0.18 1.09 0.77 0.23 0.32 0.14 0.36 0.82 4.21 4.21 1 SS 0.00 0.00 0.00 0.05 0.00 0.00 0.00 0.05 0.05 0.54 0.68 0.14 0.05 0.09 0.09 0.05 1.77 1.77 8 MS 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.14 0.09 0.00 0.00 0.00 0.00 0.23 0.23 ES 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 8.83

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2021)

METEOROLOGICAL DATA Page 65 of 75 LaSalle County Generating Station July-September 2021 33 ft. Wind Speed and Direction 200Ft-33Ft Delta-T (F)

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

CLASS N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL EU MU SU N SS MS ES TOTAL EU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.05 0.00 0.00 0.00 0.00 0.00 0.09 0.09 1 MU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.09 0.00 0.00 0.00 0.00 0.00 0.09 0.09 9 SU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.00 0.00 0.00 0.14 0.00 0.05 0.23 0.23

- N 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.14 0.09 0.05 0.00 0.00 0.00 0.32 0.32 2 SS 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 4 MS 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 ES 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.72 EU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 G MU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 T SU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 N 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 2 SS 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 4 MS 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 ES 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 TOT 4.71 4.03 6.61 7.61 6.43 3.44 3.26 4.71 7.74 9.78 11.78 7.29 6.25 6.34 4.62 5.39 100.00 1.22 4.57 10.10 34.65 26.72 13.36 9.38 100.00 Wind Direction by Stability N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL -STABILITY CLASSES-0.00 0.09 0.09 0.05 0.00 0.00 0.00 0.00 0.00 0.14 0.32 0.36 0.09 0.09 0.00 0.00 1.22 Extremely Unstable 0.09 0.23 0.27 0.14 0.18 0.05 0.05 0.00 0.23 0.54 0.63 0.82 0.54 0.45 0.32 0.05 4.57 Moderately Unstable 0.27 0.14 0.54 0.54 0.45 0.09 0.18 0.32 0.91 1.09 1.59 0.91 1.09 1.00 0.59 0.41 10.10 Slightly Unstable 2.13 1.63 4.48 3.35 1.72 0.91 1.27 1.22 2.08 2.85 3.40 1.72 1.77 1.40 1.40 3.31 34.65 Neutral 1.63 1.81 1.09 2.58 1.36 0.86 0.45 1.40 1.90 3.08 3.62 1.86 1.09 1.22 1.49 1.27 26.72 Slightly Stable 0.54 0.09 0.14 0.63 1.77 0.77 0.63 0.63 1.72 1.54 1.18 1.13 1.00 0.86 0.54 0.18 13.36 Moderately Stable 0.05 0.05 0.00 0.32 0.95 0.77 0.68 1.13 0.91 0.54 1.04 0.50 0.68 1.31 0.27 0.18 9.38 Extremely Stable Wind Direction by Wind Speed N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL -WIND SPEED CLASSES-0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 C A L M 0.77 0.54 0.68 1.45 1.36 0.72 0.59 0.36 0.32 0.27 0.18 0.45 0.82 1.18 1.13 0.86 11.68 < 3.5 mph 2.99 2.76 3.67 4.03 3.85 2.31 1.90 2.54 3.40 2.90 2.85 2.99 3.67 3.08 1.86 2.08 46.87 3.6 - 7.5 mph 0.77 0.72 2.26 1.95 1.18 0.41 0.72 1.72 3.62 4.57 6.39 2.63 1.04 1.49 1.00 1.40 31.88 7.6 - 12.5 mph 0.18 0.00 0.00 0.18 0.05 0.00 0.05 0.09 0.41 1.90 2.08 1.13 0.68 0.45 0.63 1.00 8.83 12.6 - 18.5 mph 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.14 0.27 0.09 0.05 0.14 0.00 0.05 0.72 18.6 - 24.5 mph 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 > 24.5 mph

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2021)

METEOROLOGICAL DATA Page 66 of 75 LaSalle County Generating Station July-September 2021 375 ft. Wind Speed and Direction 375Ft-33Ft Delta-T (F)

Number of Observations = 2208 Values are Percent Occurrence SPEED ---------------------------------- WIND DIRECTION CLASSES ---------------------------------- --------- STABILITY CLASSES ----------

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

- N 0.14 0.09 0.23 0.05 0.00 0.14 0.14 0.05 0.00 0.05 0.00 0.05 0.09 0.14 0.00 0.00 1.13 1.13 3 SS 0.05 0.00 0.09 0.05 0.05 0.00 0.00 0.00 0.09 0.00 0.05 0.05 0.05 0.00 0.05 0.00 0.50 0.50 MS 0.00 0.00 0.00 0.00 0.05 0.05 0.00 0.09 0.09 0.00 0.09 0.00 0.09 0.09 0.00 0.00 0.54 0.54 ES 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 2.17 EU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 MU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 4 SU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

- N 0.91 0.82 1.09 0.82 0.82 0.23 0.41 0.18 0.63 0.59 0.63 0.77 0.82 0.45 0.59 0.72 10.46 10.46 7 SS 0.45 0.32 0.36 0.50 0.68 0.41 0.27 0.27 0.36 0.05 0.18 0.27 0.18 0.18 0.18 0.23 4.89 4.89 MS 0.00 0.00 0.05 0.09 0.00 0.05 0.05 0.18 0.14 0.18 0.32 0.27 0.36 0.14 0.09 0.05 1.95 1.95 ES 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.09 0.05 0.00 0.14 0.14 17.44 EU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 MU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 8 SU 0.00 0.00 0.00 0.09 0.00 0.05 0.00 0.05 0.09 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.27 0.27

- N 0.77 1.00 1.77 1.13 1.27 0.82 0.45 0.72 1.13 1.18 1.86 1.45 0.82 1.13 0.86 1.00 17.35 17.35 1 SS 0.45 1.04 1.04 0.68 1.13 0.41 0.32 0.23 0.27 0.59 1.31 0.32 0.41 0.18 0.50 0.32 9.19 9.19 2 MS 0.32 0.23 0.00 0.00 0.05 0.09 0.23 0.32 0.23 0.23 0.41 0.00 0.27 0.54 0.59 0.09 3.58 3.58 ES 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.09 0.09 0.05 0.05 0.14 0.00 0.00 0.00 0.45 0.45 30.84 EU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 1 MU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 3 SU 0.00 0.00 0.09 0.00 0.05 0.00 0.00 0.00 0.00 0.14 0.05 0.00 0.00 0.00 0.00 0.00 0.32 0.32

- N 0.27 0.59 2.08 0.45 0.23 0.00 0.09 0.36 0.86 1.27 1.77 0.59 0.45 0.59 0.63 0.50 10.73 10.73 1 SS 0.63 0.82 1.00 0.32 0.59 0.32 0.00 0.63 1.13 1.54 1.59 0.82 0.86 0.50 0.36 0.82 11.91 11.91 8 MS 0.27 0.00 0.14 0.00 0.32 0.72 0.77 0.45 0.91 0.54 1.18 0.41 0.27 0.41 0.68 0.23 7.29 7.29 ES 0.00 0.00 0.00 0.00 0.00 0.09 0.27 0.14 0.09 0.00 0.00 0.00 0.27 0.05 0.05 0.00 0.95 0.95 31.20

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2021)

METEOROLOGICAL DATA Page 67 of 75 LaSalle County Generating Station July-September 2021 375 ft. Wind Speed and Direction 375Ft-33Ft Delta-T (F)

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

CLASS N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL EU MU SU N SS MS ES TOTAL EU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 1 MU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 9 SU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.09 0.05 0.05 0.00 0.00 0.00 0.00 0.18 0.18

- N 0.72 0.09 0.23 0.14 0.00 0.00 0.00 0.14 0.27 1.04 0.77 0.63 0.18 0.27 0.63 0.41 5.53 5.53 2 SS 0.18 0.05 0.23 0.32 0.14 0.00 0.00 0.36 0.82 2.04 1.13 0.50 0.32 0.05 0.14 0.41 6.66 6.66 4 MS 0.00 0.05 0.00 0.05 0.50 0.32 0.05 0.00 0.23 0.14 0.32 0.18 0.00 0.00 0.23 0.00 2.04 2.04 ES 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.09 0.00 0.05 0.05 0.00 0.00 0.00 0.00 0.23 0.23 14.63 EU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 G MU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.05 0.00 0.00 0.00 0.00 0.00 0.09 0.09 T SU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.09 0.00 0.00 0.00 0.00 0.00 0.14 0.14 N 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.41 0.45 0.09 0.09 0.14 0.00 0.14 1.31 1.31 2 SS 0.00 0.00 0.00 0.00 0.05 0.00 0.00 0.00 0.05 0.36 0.82 0.09 0.05 0.00 0.05 0.18 1.63 1.63 4 MS 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.18 0.32 0.00 0.00 0.00 0.00 0.54 0.54 ES 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 3.71 TOT 5.16 5.07 8.38 4.66 5.89 3.67 3.03 4.26 7.56 10.64 13.36 6.93 5.71 4.94 5.66 5.07 100.00 0.00 0.09 0.91 46.51 34.78 15.94 1.77 100.00 Wind Direction by Stability N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL -STABILITY CLASSES-0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Extremely Unstable 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.05 0.00 0.00 0.00 0.00 0.00 0.09 Moderately Unstable 0.00 0.00 0.09 0.09 0.05 0.05 0.00 0.05 0.09 0.27 0.18 0.05 0.00 0.00 0.00 0.00 0.91 Slightly Unstable 2.81 2.58 5.39 2.58 2.31 1.18 1.09 1.45 2.90 4.53 5.48 3.58 2.45 2.72 2.72 2.76 46.51 Neutral 1.77 2.22 2.72 1.86 2.63 1.13 0.59 1.49 2.72 4.57 5.07 2.04 1.86 0.91 1.27 1.95 34.78 Slightly Stable 0.59 0.27 0.18 0.14 0.91 1.22 1.09 1.04 1.59 1.13 2.49 1.18 1.00 1.18 1.59 0.36 15.94 Moderately Stable 0.00 0.00 0.00 0.00 0.00 0.09 0.27 0.23 0.27 0.09 0.09 0.09 0.41 0.14 0.09 0.00 1.77 Extremely Stable Wind Direction by Wind Speed N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL -WIND SPEED CLASSES-0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 C A L M 0.18 0.09 0.32 0.09 0.09 0.18 0.14 0.14 0.18 0.05 0.14 0.09 0.23 0.23 0.05 0.00 2.17 < 3.5 mph 1.36 1.13 1.49 1.40 1.49 0.68 0.72 0.63 1.13 0.82 1.13 1.31 1.36 0.86 0.91 1.00 17.44 3.6 - 7.5 mph 1.54 2.26 2.81 1.90 2.45 1.36 1.00 1.36 1.81 2.08 3.62 1.81 1.63 1.86 1.95 1.40 30.84 7.6 - 12.5 mph 1.18 1.40 3.31 0.77 1.18 1.13 1.13 1.59 2.99 3.49 4.57 1.81 1.86 1.54 1.72 1.54 31.20 12.6 - 18.5 mph 0.91 0.18 0.45 0.50 0.63 0.32 0.05 0.54 1.40 3.31 2.31 1.40 0.50 0.32 1.00 0.82 14.63 18.6 - 24.5 mph 0.00 0.00 0.00 0.00 0.05 0.00 0.00 0.00 0.05 0.91 1.59 0.50 0.14 0.14 0.05 0.32 3.71 > 24.5 mph

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2021)

METEOROLOGICAL DATA Page 68 of 75 LaSalle County Generating Station October-December 2021 33 ft. Wind Speed and Direction 200Ft-33Ft Delta-T (F)

Number of Observations = 2206 Values are Percent Occurrence SPEED ---------------------------------- WIND DIRECTION CLASSES ---------------------------------- --------- STABILITY CLASSES ----------

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

- N 0.00 0.05 0.00 0.00 0.05 0.00 0.00 0.00 0.05 0.05 0.00 0.00 0.05 0.00 0.00 0.00 0.23 0.23 3 SS 0.05 0.00 0.05 0.09 0.00 0.00 0.09 0.05 0.05 0.09 0.05 0.00 0.05 0.00 0.05 0.05 0.63 0.63 MS 0.00 0.00 0.05 0.09 0.05 0.00 0.09 0.09 0.18 0.18 0.05 0.05 0.05 0.05 0.05 0.14 1.09 1.09 ES 0.09 0.00 0.00 0.00 0.05 0.00 0.00 0.00 0.05 0.05 0.00 0.00 0.00 0.00 0.05 0.00 0.27 0.27 2.22 EU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 MU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 4 SU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

- N 1.54 0.50 0.32 0.23 0.23 0.27 0.45 0.41 0.63 0.54 0.54 0.41 0.50 0.54 0.14 0.73 7.98 7.98 7 SS 1.09 0.32 0.05 0.09 0.45 0.36 0.18 0.36 0.63 0.45 0.32 0.50 0.50 0.54 0.63 0.54 7.03 7.03 MS 0.14 0.09 0.05 0.05 0.63 0.41 0.36 0.59 0.54 0.45 0.23 0.32 0.63 0.63 0.14 0.18 5.44 5.44 ES 0.00 0.00 0.00 0.00 0.36 0.82 1.04 0.36 1.27 0.68 0.41 0.27 1.00 0.18 0.09 0.09 6.57 6.57 27.02 EU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 MU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.05 8 SU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.27 0.18 0.09 0.05 0.00 0.18 0.00 0.00 0.82 0.82

- N 1.00 0.95 0.73 1.41 1.09 0.36 0.77 0.95 1.04 1.45 0.73 0.23 1.27 1.63 0.59 1.31 15.50 15.50 1 SS 0.23 0.23 0.32 0.59 1.22 0.23 0.59 0.63 1.00 1.00 0.45 0.45 1.54 1.95 0.36 0.41 11.20 11.20 2 MS 0.00 0.00 0.00 0.14 0.63 0.09 0.14 0.27 0.63 0.54 0.73 0.45 1.04 0.82 0.09 0.00 5.58 5.58 ES 0.00 0.00 0.00 0.00 0.23 0.18 0.14 0.09 0.68 1.04 0.18 0.59 0.27 0.00 0.00 0.00 3.40 3.40 36.54 EU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.00 0.00 0.00 0.05 0.05 1 MU 0.00 0.00 0.00 0.00 0.00 0.05 0.00 0.00 0.05 0.05 0.05 0.00 0.00 0.00 0.00 0.00 0.18 0.18 3 SU 0.00 0.00 0.00 0.05 0.00 0.14 0.00 0.05 0.09 0.14 0.41 0.00 0.05 0.18 0.05 0.00 1.13 1.13

- N 0.54 0.23 0.18 1.54 0.59 0.45 0.54 0.45 0.73 0.91 0.68 0.77 1.63 1.90 0.95 1.59 13.69 13.69 1 SS 0.00 0.00 0.00 0.05 0.54 0.23 0.32 1.09 1.95 1.13 0.77 0.54 0.73 0.77 0.09 0.05 8.25 8.25 8 MS 0.00 0.00 0.00 0.00 0.00 0.00 0.18 0.05 0.18 0.77 0.63 0.45 0.00 0.00 0.00 0.00 2.27 2.27 ES 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.14 0.00 0.05 0.00 0.00 0.00 0.18 0.18 25.75

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2021)

METEOROLOGICAL DATA Page 69 of 75 LaSalle County Generating Station October-December 2021 33 ft. Wind Speed and Direction 200Ft-33Ft Delta-T (F)

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

CLASS N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL EU MU SU N SS MS ES TOTAL EU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.00 0.00 0.00 0.05 0.05 1 MU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 9 SU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.00 0.00 0.00 0.00 0.00 0.05 0.05

- N 0.00 0.00 0.09 0.54 0.05 0.14 0.00 0.05 0.36 0.36 0.09 0.73 0.82 0.68 0.23 0.09 4.22 4.22 2 SS 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.18 0.32 0.27 0.09 0.05 0.41 0.45 0.00 0.00 1.81 1.81 4 MS 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 ES 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 6.12 EU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 G MU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 T SU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.09 0.00 0.00 0.00 0.09 0.09 N 0.00 0.00 0.00 0.09 0.00 0.00 0.00 0.05 0.00 0.14 0.00 0.14 0.09 0.00 0.00 0.00 0.50 0.50 2 SS 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.00 0.32 0.18 0.00 0.05 0.32 0.86 0.00 0.00 1.77 1.77 4 MS 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 ES 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 2.36 TOT 4.67 2.36 1.81 4.94 6.17 3.72 4.99 5.76 11.06 10.65 6.66 6.03 11.15 11.38 3.49 5.17 100.00 0.09 0.23 2.09 42.11 30.69 14.37 10.43 100.00 Wind Direction by Stability N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL -STABILITY CLASSES-0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.09 0.00 0.00 0.00 0.09 Extremely Unstable 0.00 0.00 0.00 0.00 0.00 0.05 0.00 0.00 0.09 0.05 0.05 0.00 0.00 0.00 0.00 0.00 0.23 Moderately Unstable 0.00 0.00 0.00 0.05 0.00 0.14 0.00 0.09 0.36 0.32 0.54 0.05 0.14 0.36 0.05 0.00 2.09 Slightly Unstable 3.08 1.72 1.31 3.81 1.99 1.22 1.77 1.90 2.81 3.45 2.04 2.27 4.35 4.76 1.90 3.72 42.11 Neutral 1.36 0.54 0.41 0.82 2.22 0.82 1.27 2.31 4.26 3.13 1.68 1.59 3.54 4.58 1.13 1.04 30.69 Slightly Stable 0.14 0.09 0.09 0.27 1.31 0.50 0.77 1.00 1.54 1.95 1.63 1.27 1.72 1.50 0.27 0.32 14.37 Moderately Stable 0.09 0.00 0.00 0.00 0.63 1.00 1.18 0.45 1.99 1.77 0.73 0.86 1.31 0.18 0.14 0.09 10.43 Extremely Stable Wind Direction by Wind Speed N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL -WIND SPEED CLASSES-0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 C A L M 0.14 0.05 0.09 0.18 0.14 0.00 0.18 0.14 0.32 0.36 0.09 0.05 0.14 0.05 0.14 0.18 2.22 < 3.5 mph 2.77 0.91 0.41 0.36 1.68 1.86 2.04 1.72 3.08 2.13 1.50 1.50 2.63 1.90 1.00 1.54 27.02 3.6 - 7.5 mph 1.22 1.18 1.04 2.13 3.17 0.86 1.63 1.99 3.67 4.22 2.18 1.77 4.13 4.58 1.04 1.72 36.54 7.6 - 12.5 mph 0.54 0.23 0.18 1.63 1.13 0.86 1.04 1.63 2.99 2.99 2.67 1.77 2.49 2.86 1.09 1.63 25.75 12.6 - 18.5 mph 0.00 0.00 0.09 0.54 0.05 0.14 0.05 0.23 0.68 0.63 0.23 0.77 1.27 1.13 0.23 0.09 6.12 18.6 - 24.5 mph 0.00 0.00 0.00 0.09 0.00 0.00 0.05 0.05 0.32 0.32 0.00 0.18 0.50 0.86 0.00 0.00 2.36 > 24.5 mph

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2021)

METEOROLOGICAL DATA Page 70 of 75 LaSalle County Generating Station October-December 2021 375 ft. Wind Speed and Direction 375Ft-33Ft Delta-T (F)

Number of Observations = 2206 Values are Percent Occurrence SPEED ---------------------------------- WIND DIRECTION CLASSES ---------------------------------- --------- STABILITY CLASSES ----------

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

- N 0.00 0.00 0.05 0.00 0.00 0.00 0.00 0.00 0.05 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.14 0.14 3 SS 0.05 0.00 0.05 0.00 0.00 0.00 0.05 0.00 0.00 0.00 0.05 0.09 0.00 0.05 0.00 0.00 0.32 0.32 MS 0.00 0.00 0.00 0.00 0.05 0.00 0.00 0.05 0.00 0.00 0.00 0.05 0.00 0.00 0.00 0.00 0.14 0.14 ES 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.59 EU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 MU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 4 SU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

- N 0.50 0.27 0.41 0.14 0.14 0.14 0.27 0.09 0.27 0.18 0.41 0.14 0.14 0.27 0.14 0.32 3.81 3.81 7 SS 0.18 0.09 0.23 0.09 0.09 0.09 0.00 0.09 0.27 0.36 0.18 0.27 0.14 0.00 0.05 0.09 2.22 2.22 MS 0.05 0.05 0.09 0.14 0.05 0.05 0.05 0.05 0.14 0.18 0.45 0.09 0.14 0.09 0.05 0.00 1.63 1.63 ES 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.09 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.09 0.09 7.75 EU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 MU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 8 SU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

- N 0.63 0.82 0.27 0.50 0.54 0.27 0.27 0.45 0.63 1.04 1.00 0.32 0.50 1.13 0.41 0.36 9.16 9.16 1 SS 0.54 0.23 0.14 0.09 0.36 0.27 0.23 0.14 0.32 0.63 0.54 0.23 0.41 0.45 0.50 0.18 5.26 5.26 2 MS 0.05 0.18 0.18 0.05 0.05 0.09 0.18 0.09 0.36 0.23 0.09 0.23 0.27 0.32 0.14 0.18 2.67 2.67 ES 0.00 0.00 0.00 0.00 0.00 0.00 0.27 0.14 0.14 0.18 0.05 0.18 0.23 0.00 0.00 0.00 1.18 1.18 18.27 EU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.00 0.00 0.00 0.00 0.05 0.05 1 MU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 3 SU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

- N 0.73 1.18 0.63 1.50 0.86 0.45 0.73 1.09 1.09 0.68 0.95 0.41 1.13 1.72 0.82 0.86 14.82 14.82 1 SS 0.32 0.63 0.27 0.32 0.41 0.41 0.14 0.54 1.09 0.54 0.54 0.36 0.41 1.81 0.91 0.41 9.11 9.11 8 MS 0.14 0.05 0.00 0.05 0.23 0.27 0.36 0.09 0.68 0.41 0.18 0.00 0.23 0.73 0.27 0.00 3.67 3.67 ES 0.00 0.00 0.00 0.00 0.00 0.00 0.23 0.18 0.09 0.32 0.18 0.05 0.00 0.00 0.00 0.00 1.04 1.04 28.69

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2021)

METEOROLOGICAL DATA Page 71 of 75 LaSalle County Generating Station October-December 2021 375 ft. Wind Speed and Direction 375Ft-33Ft Delta-T (F)

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

CLASS N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL EU MU SU N SS MS ES TOTAL EU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 1 MU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.00 0.00 0.00 0.05 0.05 9 SU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

- N 0.86 0.05 0.36 1.00 0.54 0.23 0.36 0.36 0.73 1.04 0.77 0.59 1.04 1.27 1.27 0.45 10.92 10.92 2 SS 0.27 0.05 0.09 0.18 0.77 0.63 0.23 0.68 0.95 1.68 1.13 0.50 0.59 1.90 0.82 0.18 10.65 10.65 4 MS 0.00 0.09 0.00 0.05 0.32 0.09 0.14 0.27 0.36 0.63 0.59 0.18 0.32 0.50 0.09 0.05 3.67 3.67 ES 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.05 0.05 0.09 0.00 0.09 0.00 0.00 0.00 0.00 0.32 0.32 25.61 EU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 G MU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 T SU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 N 0.23 0.18 0.14 0.59 0.27 0.18 0.00 0.14 1.04 0.54 0.27 0.95 1.13 0.68 0.95 0.27 7.57 7.57 2 SS 0.00 0.00 0.00 0.00 0.36 0.09 0.41 0.95 1.90 1.68 1.18 0.59 1.13 1.99 0.18 0.00 10.47 10.47 4 MS 0.00 0.00 0.00 0.00 0.05 0.00 0.00 0.05 0.14 0.18 0.41 0.18 0.00 0.05 0.00 0.00 1.04 1.04 ES 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 19.08 TOT 4.53 3.85 2.90 4.67 5.08 3.26 3.94 5.58 10.29 10.61 8.98 5.53 7.84 12.96 6.57 3.40 100.00 0.05 0.05 0.00 46.42 38.03 12.83 2.63 100.00 Wind Direction by Stability N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL -STABILITY CLASSES-0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.00 0.00 0.00 0.00 0.05 Extremely Unstable 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.00 0.00 0.00 0.05 Moderately Unstable 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Slightly Unstable 2.95 2.49 1.86 3.72 2.36 1.27 1.63 2.13 3.81 3.49 3.40 2.40 3.94 5.08 3.58 2.31 46.42 Neutral 1.36 1.00 0.77 0.68 1.99 1.50 1.04 2.40 4.53 4.90 3.63 2.04 2.67 6.21 2.45 0.86 38.03 Slightly Stable 0.23 0.36 0.27 0.27 0.73 0.50 0.73 0.59 1.68 1.63 1.72 0.73 0.95 1.68 0.54 0.23 12.83 Moderately Stable 0.00 0.00 0.00 0.00 0.00 0.00 0.54 0.45 0.27 0.59 0.23 0.32 0.23 0.00 0.00 0.00 2.63 Extremely Stable Wind Direction by Wind Speed N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL -WIND SPEED CLASSES-0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 C A L M 0.05 0.00 0.09 0.00 0.05 0.00 0.05 0.05 0.05 0.00 0.05 0.14 0.00 0.05 0.00 0.05 0.59 < 3.5 mph 0.73 0.41 0.73 0.36 0.27 0.27 0.32 0.32 0.68 0.73 1.04 0.50 0.41 0.36 0.23 0.41 7.75 3.6 - 7.5 mph 1.22 1.22 0.59 0.63 0.95 0.63 0.95 0.82 1.45 2.09 1.68 0.95 1.41 1.90 1.04 0.73 18.27 7.6 - 12.5 mph 1.18 1.86 0.91 1.86 1.50 1.13 1.45 1.90 2.95 1.95 1.86 0.86 1.77 4.26 1.99 1.27 28.69 12.6 - 18.5 mph 1.13 0.18 0.45 1.22 1.63 0.95 0.77 1.36 2.09 3.45 2.49 1.36 1.99 3.67 2.18 0.68 25.61 18.6 - 24.5 mph 0.23 0.18 0.14 0.59 0.68 0.27 0.41 1.13 3.08 2.40 1.86 1.72 2.27 2.72 1.13 0.27 19.08 > 24.5 mph

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2021)

METEOROLOGICAL DATA Page 72 of 75 LaSalle County Generating Station January-December 2021 33 ft. Wind Speed and Direction 200Ft-33Ft Delta-T (F)

Number of Observations = 8740 Values are Percent Occurrence SPEED ---------------------------------- WIND DIRECTION CLASSES ---------------------------------- --------- STABILITY CLASSES ----------

CLASS N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL EU MU SU N SS MS ES TOTAL EU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 MU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 C SU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 A N 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 L SS 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 M MS 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 ES 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 EU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 MU 0.00 0.00 0.01 0.00 0.00 0.00 0.00 0.00 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.02 0.02 1 SU 0.01 0.00 0.00 0.02 0.03 0.00 0.02 0.01 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.13 0.13

- N 0.08 0.11 0.10 0.19 0.24 0.09 0.15 0.05 0.07 0.07 0.02 0.06 0.07 0.11 0.15 0.10 1.67 1.67 3 SS 0.18 0.17 0.16 0.42 0.43 0.22 0.15 0.17 0.05 0.06 0.10 0.07 0.10 0.18 0.11 0.11 2.70 2.70 MS 0.13 0.03 0.13 0.25 0.34 0.19 0.07 0.06 0.15 0.09 0.05 0.10 0.17 0.13 0.11 0.10 2.11 2.11 ES 0.06 0.06 0.06 0.16 0.23 0.07 0.07 0.03 0.03 0.03 0.02 0.06 0.16 0.26 0.18 0.16 1.65 1.65 8.27 EU 0.02 0.07 0.07 0.03 0.02 0.00 0.00 0.00 0.00 0.00 0.01 0.02 0.01 0.06 0.02 0.02 0.37 0.37 MU 0.01 0.08 0.08 0.05 0.03 0.02 0.01 0.03 0.05 0.03 0.05 0.13 0.13 0.07 0.17 0.05 0.98 0.98 4 SU 0.08 0.06 0.15 0.11 0.07 0.02 0.06 0.06 0.11 0.14 0.08 0.08 0.19 0.19 0.14 0.05 1.59 1.59

- N 1.32 0.74 1.09 1.10 0.62 0.48 0.53 0.45 0.68 0.54 0.57 0.50 0.69 0.56 0.31 0.81 10.97 10.97 7 SS 1.00 0.62 0.33 0.32 0.49 0.40 0.54 0.64 0.73 0.51 0.57 0.62 0.57 0.50 0.47 0.57 8.89 8.89 MS 0.18 0.05 0.01 0.11 0.59 0.46 0.39 0.40 0.54 0.49 0.15 0.33 0.45 0.54 0.16 0.08 4.93 4.93 ES 0.00 0.00 0.00 0.03 0.32 0.48 0.54 0.40 0.57 0.34 0.32 0.19 0.43 0.32 0.02 0.02 4.00 4.00 31.74 EU 0.13 0.03 0.08 0.05 0.00 0.00 0.00 0.00 0.08 0.06 0.08 0.16 0.10 0.03 0.05 0.07 0.92 0.92 MU 0.05 0.05 0.07 0.05 0.01 0.01 0.02 0.01 0.09 0.13 0.16 0.09 0.06 0.07 0.03 0.01 0.90 0.90 8 SU 0.08 0.01 0.14 0.13 0.06 0.03 0.06 0.14 0.26 0.32 0.45 0.13 0.10 0.17 0.05 0.03 2.15 2.15

- N 1.50 0.76 1.18 0.84 0.57 0.29 0.59 0.74 1.25 1.10 1.32 0.62 1.18 1.32 0.73 1.92 15.89 15.89 1 SS 0.27 0.18 0.22 0.51 0.53 0.21 0.38 0.53 0.87 1.01 0.88 0.53 0.86 0.95 0.69 0.37 8.97 8.97 2 MS 0.00 0.00 0.00 0.11 0.38 0.13 0.14 0.15 0.40 0.42 0.51 0.47 0.49 0.38 0.14 0.01 3.73 3.73 ES 0.00 0.00 0.00 0.01 0.10 0.16 0.35 0.26 0.54 0.57 0.27 0.33 0.19 0.08 0.00 0.00 2.88 2.88 35.45 EU 0.01 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.06 0.03 0.06 0.07 0.01 0.01 0.00 0.00 0.26 0.26 1 MU 0.06 0.00 0.01 0.01 0.01 0.01 0.00 0.00 0.11 0.10 0.14 0.08 0.05 0.07 0.00 0.01 0.66 0.66 3 SU 0.07 0.00 0.01 0.05 0.00 0.03 0.00 0.06 0.17 0.22 0.22 0.14 0.17 0.25 0.10 0.10 1.59 1.59

- N 0.56 0.15 0.51 0.54 0.35 0.15 0.25 0.18 0.48 0.89 0.69 0.49 0.87 1.11 0.62 1.80 9.65 9.65 1 SS 0.01 0.01 0.03 0.03 0.15 0.16 0.21 0.45 0.65 0.71 0.66 0.35 0.42 0.49 0.10 0.02 4.47 4.47 8 MS 0.00 0.00 0.00 0.00 0.00 0.00 0.07 0.06 0.13 0.39 0.43 0.32 0.06 0.00 0.00 0.00 1.45 1.45 ES 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.09 0.10 0.09 0.02 0.01 0.00 0.00 0.00 0.37 0.37 18.46

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2021)

METEOROLOGICAL DATA Page 73 of 75 LaSalle County Generating Station January-December 2021 33 ft. Wind Speed and Direction 200Ft-33Ft Delta-T (F)

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

CLASS N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL EU MU SU N SS MS ES TOTAL EU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.10 0.06 0.02 0.02 0.00 0.00 0.00 0.25 0.25 1 MU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.07 0.03 0.09 0.03 0.03 0.02 0.00 0.00 0.29 0.29 9 SU 0.00 0.00 0.00 0.01 0.00 0.00 0.00 0.01 0.01 0.01 0.05 0.02 0.03 0.07 0.00 0.01 0.23 0.23

- N 0.00 0.17 0.10 0.29 0.06 0.13 0.02 0.03 0.14 0.18 0.18 0.25 0.42 0.42 0.08 0.06 2.54 2.54 2 SS 0.00 0.00 0.00 0.00 0.01 0.03 0.10 0.15 0.26 0.25 0.09 0.01 0.24 0.18 0.00 0.00 1.34 1.34 4 MS 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.03 0.01 0.00 0.00 0.00 0.00 0.05 0.05 ES 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.02 0.00 0.00 0.00 0.00 0.00 0.00 0.02 0.02 4.71 EU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.07 0.01 0.02 0.00 0.00 0.00 0.00 0.00 0.11 0.11 G MU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.02 0.03 0.00 0.00 0.00 0.00 0.00 0.06 0.06 T SU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.02 0.02 0.02 0.01 0.02 0.00 0.01 0.00 0.11 0.11 N 0.00 0.00 0.01 0.05 0.05 0.00 0.00 0.02 0.01 0.09 0.00 0.05 0.05 0.03 0.03 0.00 0.39 0.39 2 SS 0.00 0.00 0.00 0.00 0.01 0.00 0.02 0.02 0.11 0.10 0.00 0.02 0.17 0.23 0.00 0.00 0.70 0.70 4 MS 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 ES 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 1.37 TOT 5.80 3.36 4.55 5.48 5.72 3.78 4.74 5.17 8.92 9.22 8.49 6.40 8.55 8.82 4.49 6.51 100.00 1.91 2.92 5.80 41.11 27.07 12.27 8.92 100.00 Wind Direction by Stability N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL -STABILITY CLASSES-0.16 0.11 0.15 0.08 0.02 0.00 0.00 0.01 0.25 0.21 0.23 0.27 0.15 0.10 0.07 0.09 1.91 Extremely Unstable 0.11 0.13 0.17 0.10 0.06 0.05 0.03 0.05 0.33 0.32 0.47 0.33 0.26 0.23 0.21 0.07 2.92 Moderately Unstable 0.24 0.07 0.30 0.32 0.16 0.09 0.14 0.27 0.59 0.71 0.81 0.38 0.53 0.69 0.30 0.21 5.80 Slightly Unstable 3.46 1.93 3.00 3.00 1.89 1.13 1.54 1.48 2.62 2.87 2.78 1.97 3.27 3.56 1.92 4.69 41.11 Neutral 1.46 0.98 0.74 1.29 1.62 1.02 1.40 1.96 2.68 2.64 2.31 1.60 2.37 2.54 1.37 1.08 27.07 Slightly Stable 0.31 0.08 0.14 0.48 1.32 0.78 0.66 0.66 1.21 1.40 1.18 1.24 1.17 1.04 0.41 0.19 12.27 Moderately Stable 0.06 0.06 0.06 0.21 0.65 0.71 0.96 0.74 1.24 1.08 0.71 0.61 0.80 0.66 0.21 0.18 8.92 Extremely Stable Wind Direction by Wind Speed N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL -WIND SPEED CLASSES-0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 C A L M 0.46 0.38 0.46 1.05 1.28 0.57 0.46 0.32 0.32 0.25 0.19 0.29 0.50 0.69 0.56 0.49 8.27 < 3.5 mph 2.61 1.61 1.73 1.76 2.15 1.86 2.06 1.98 2.68 2.06 1.75 1.88 2.47 2.24 1.29 1.60 31.74 3.6 - 7.5 mph 2.03 1.03 1.68 1.69 1.65 0.82 1.54 1.83 3.49 3.60 3.67 2.32 2.99 3.00 1.68 2.41 35.45 7.6 - 12.5 mph 0.71 0.17 0.57 0.63 0.51 0.35 0.53 0.79 1.69 2.45 2.29 1.48 1.59 1.93 0.82 1.93 18.46 12.6 - 18.5 mph 0.00 0.17 0.10 0.30 0.07 0.16 0.13 0.19 0.53 0.61 0.50 0.35 0.76 0.70 0.08 0.07 4.71 18.6 - 24.5 mph 0.00 0.00 0.01 0.05 0.06 0.00 0.02 0.06 0.22 0.25 0.08 0.08 0.24 0.26 0.05 0.00 1.37 > 24.5 mph

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2021)

METEOROLOGICAL DATA Page 74 of 75 LaSalle County Generating Station January-December 2021 375 ft. Wind Speed and Direction 375Ft-33Ft Delta-T (F)

Number of Observations = 8549 Values are Percent Occurrence SPEED ---------------------------------- WIND DIRECTION CLASSES ---------------------------------- --------- STABILITY CLASSES ----------

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

- N 0.09 0.09 0.08 0.05 0.05 0.11 0.06 0.07 0.05 0.02 0.04 0.07 0.07 0.06 0.02 0.06 0.98 0.98 3 SS 0.04 0.02 0.06 0.05 0.02 0.01 0.07 0.02 0.02 0.02 0.02 0.04 0.02 0.06 0.02 0.00 0.50 0.50 MS 0.00 0.00 0.00 0.01 0.02 0.01 0.01 0.04 0.04 0.02 0.07 0.05 0.04 0.04 0.01 0.01 0.36 0.36 ES 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.02 0.02 1.87 EU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 MU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.00 0.00 0.00 0.00 0.00 0.01 0.01 4 SU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

- N 0.64 0.51 0.56 0.60 0.44 0.23 0.40 0.21 0.46 0.33 0.41 0.47 0.42 0.26 0.36 0.41 6.71 6.71 7 SS 0.18 0.23 0.28 0.39 0.32 0.29 0.22 0.26 0.28 0.30 0.33 0.19 0.15 0.07 0.11 0.12 3.71 3.71 MS 0.05 0.08 0.11 0.11 0.05 0.07 0.12 0.13 0.11 0.14 0.26 0.15 0.19 0.11 0.11 0.04 1.79 1.79 ES 0.00 0.00 0.00 0.01 0.00 0.00 0.00 0.02 0.01 0.00 0.00 0.00 0.01 0.06 0.02 0.00 0.14 0.14 12.36 EU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 MU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 8 SU 0.00 0.00 0.00 0.02 0.00 0.01 0.00 0.01 0.02 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.07 0.07

- N 0.97 1.01 0.89 0.96 0.73 0.46 0.29 0.50 0.77 0.91 0.97 0.75 0.75 1.02 0.75 0.83 12.55 12.55 1 SS 0.53 0.54 0.55 0.43 0.61 0.34 0.36 0.28 0.51 0.64 0.66 0.27 0.47 0.42 0.47 0.23 7.31 7.31 2 MS 0.11 0.15 0.09 0.02 0.05 0.08 0.27 0.18 0.32 0.20 0.19 0.12 0.25 0.26 0.27 0.07 2.61 2.61 ES 0.00 0.00 0.01 0.00 0.00 0.00 0.07 0.05 0.06 0.07 0.05 0.11 0.12 0.04 0.02 0.00 0.58 0.58 23.13 EU 0.00 0.00 0.00 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.00 0.00 0.00 0.00 0.02 0.02 1 MU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 3 SU 0.02 0.00 0.04 0.01 0.01 0.00 0.00 0.01 0.05 0.05 0.01 0.00 0.00 0.06 0.02 0.02 0.30 0.30

- N 1.13 0.84 1.23 0.82 0.57 0.32 0.41 0.62 0.90 1.04 1.15 0.76 1.04 1.25 1.18 1.33 14.60 14.60 1 SS 0.48 0.64 0.51 0.28 0.51 0.46 0.35 0.81 1.16 1.09 0.96 0.56 0.66 1.08 0.62 0.55 10.71 10.71 8 MS 0.15 0.05 0.05 0.01 0.15 0.32 0.46 0.28 0.56 0.40 0.46 0.25 0.22 0.44 0.37 0.13 4.29 4.29 ES 0.00 0.00 0.01 0.00 0.00 0.05 0.19 0.09 0.11 0.08 0.06 0.05 0.12 0.01 0.01 0.01 0.78 0.78 30.72

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2021)

METEOROLOGICAL DATA Page 75 of 75 LaSalle County Generating Station January-December 2021 375 ft. Wind Speed and Direction 375Ft-33Ft Delta-T (F)

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

CLASS N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL EU MU SU N SS MS ES TOTAL EU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 1 MU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.06 0.00 0.00 0.00 0.06 0.06 9 SU 0.02 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.06 0.06 0.08 0.06 0.08 0.05 0.00 0.00 0.41 0.41

- N 0.82 0.09 0.61 0.50 0.26 0.07 0.20 0.22 0.67 0.95 0.71 0.60 0.60 0.92 0.89 0.67 8.77 8.77 2 SS 0.18 0.12 0.13 0.13 0.27 0.26 0.20 0.46 0.84 1.33 0.78 0.43 0.46 0.84 0.34 0.29 7.05 7.05 4 MS 0.01 0.04 0.00 0.02 0.21 0.12 0.21 0.14 0.26 0.46 0.41 0.15 0.16 0.18 0.11 0.04 2.50 2.50 ES 0.00 0.00 0.00 0.00 0.00 0.00 0.12 0.16 0.15 0.07 0.04 0.04 0.00 0.00 0.00 0.00 0.57 0.57 19.37 EU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.02 0.00 0.00 0.00 0.00 0.02 0.00 0.00 0.05 0.05 G MU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.06 0.07 0.04 0.01 0.00 0.05 0.04 0.00 0.27 0.27 T SU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.06 0.08 0.11 0.02 0.01 0.04 0.02 0.00 0.34 0.34 N 0.12 0.25 0.33 0.35 0.16 0.14 0.07 0.09 0.50 0.46 0.33 0.40 0.70 0.62 0.36 0.13 5.01 5.01 2 SS 0.00 0.01 0.00 0.00 0.12 0.05 0.33 0.42 0.96 0.94 0.99 0.35 0.48 0.69 0.09 0.05 5.47 5.47 4 MS 0.00 0.01 0.00 0.00 0.01 0.00 0.02 0.06 0.14 0.27 0.29 0.35 0.08 0.02 0.00 0.00 1.26 1.26 ES 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.02 0.07 0.05 0.00 0.00 0.00 0.00 0.00 0.00 0.15 0.15 12.55 TOT 5.54 4.69 5.53 4.78 4.56 3.38 4.43 5.17 9.22 10.05 9.40 6.23 7.15 8.64 6.22 4.98 100.00 0.07 0.34 1.12 48.63 34.76 12.82 2.26 100.00 Wind Direction by Stability N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL -STABILITY CLASSES-0.00 0.00 0.00 0.01 0.00 0.00 0.00 0.00 0.02 0.00 0.00 0.01 0.00 0.02 0.00 0.00 0.07 Extremely Unstable 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.06 0.07 0.05 0.01 0.06 0.05 0.04 0.00 0.34 Moderately Unstable 0.05 0.00 0.04 0.04 0.01 0.01 0.00 0.02 0.19 0.19 0.20 0.08 0.09 0.14 0.05 0.02 1.12 Slightly Unstable 3.78 2.80 3.70 3.28 2.21 1.32 1.43 1.72 3.35 3.71 3.60 3.04 3.58 4.13 3.57 3.43 48.63 Neutral 1.39 1.57 1.53 1.28 1.85 1.40 1.53 2.25 3.78 4.33 3.74 1.84 2.23 3.16 1.65 1.24 34.76 Slightly Stable 0.32 0.33 0.25 0.18 0.49 0.60 1.09 0.82 1.42 1.49 1.67 1.06 0.94 1.04 0.87 0.28 12.82 Moderately Stable 0.01 0.00 0.02 0.01 0.00 0.05 0.39 0.35 0.41 0.27 0.14 0.19 0.25 0.11 0.06 0.01 2.26 Extremely Stable Wind Direction by Wind Speed N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL -WIND SPEED CLASSES-0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 C A L M 0.14 0.12 0.14 0.11 0.09 0.13 0.14 0.13 0.12 0.07 0.13 0.15 0.13 0.15 0.06 0.07 1.87 < 3.5 mph 0.87 0.83 0.95 1.10 0.81 0.60 0.74 0.62 0.85 0.77 1.01 0.81 0.77 0.49 0.60 0.56 12.36 3.6 - 7.5 mph 1.60 1.70 1.54 1.44 1.38 0.89 0.99 1.02 1.68 1.82 1.86 1.24 1.58 1.73 1.51 1.13 23.13 7.6 - 12.5 mph 1.79 1.53 1.84 1.13 1.25 1.13 1.40 1.81 2.77 2.66 2.63 1.63 2.04 2.84 2.21 2.05 30.72 12.6 - 18.5 mph 1.03 0.25 0.74 0.66 0.74 0.44 0.73 0.98 1.98 2.87 2.02 1.28 1.36 1.99 1.33 0.99 19.37 18.6 - 24.5 mph 0.12 0.27 0.33 0.35 0.29 0.19 0.43 0.61 1.81 1.86 1.75 1.13 1.28 1.44 0.51 0.18 12.55 > 24.5 mph

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