Text

Annual Radiological Environmental Operating Report (AREOR)
	ML24130A130
Person / Time
Site:	Byron
Issue date:	05/09/2024
From:	Welt H; Constellation Energy Generation
To:	; Office of Nuclear Reactor Regulation, Document Control Desk
References
	BYRON 2024-0028
	Download: ML24130A130 (1)
	v • d • e

Constellation May 9, 2024 L TR:

BYRON 2024-0028 File:

10.101 2C.111 United States Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555-0001 Byron Station, Units 1 and 2 Constellation Energy Generation. LLC (CEG)

Byron Station 4450 N. German Church Road Byron IL 61010-9794 www.constellationenergy.com Renewed Facility Operating License Nos. NPF-37 and NPF-66 NRC Docket Nos. STN 50-454 and STN 50-455

Subject:

2023 Annual Radiological Environmental Operating Report (AREOR)

In accordance with Technical Specification 5.6.2, "Annual Radiological Environmental Operating Report," we are submitting the Annual Radiological Environmental Operating Report (AREOR) for Byron Station, Units 1 and 2. This report is required to be submitted to the NRC by May 15th of each year and contains the results of the radiological environmental and meteorological monitoring programs. The Radioactive Effluent Release Report was submitted under separate cover.

Also included are the results of groundwater monitoring conducted in accordance with Constellation's Radiological Groundwater Protection Program (RGPP), which is a voluntary program implemented in 2006. This information is being reported in accordance with a nuclear industry initiative.

If you have any questions regarding this information, please contact Ms. Zoe Cox, Regulatory Assurance Manager, at (779) 231-6606.

Respectfully, Harris Welt Site Vice President Byron Generating Station HW/AH/JA/hh

Attachment:

AREOR Report cc:

Regional Administrator - NRC Region Ill

NRC.Docket No:

50-454 50-455 BYRON CLEAN ENERGY CENTER Ui~iTS 1 and 2 Annual Radiological Environmental Operating Report 1 January Through 31 December 2023 Prepared By Teledyne Brown Engineering Environmental Services p1 Constellation Byron Clean Energy Center Byron, IL 61010 April 2024

Intentionally left blank

Table Of Contents I. Summary and Conclusions.............................................................................................. 2

!I. !ntrcducticn...................................................................................................................... 3 A. Objectives of the REMP....................................................................................... 3 B. Implementation of the Objectives........................................................................ 3 Ill. Program Description....................................................................................................... 4 A. Sample Collection................................................................................................ 4 B. Sample Analysis.................................................................................................. 6 C. Data Interpretation............................................................................................... 5 D. Program Exceptions............................................................................................ 6 E. Program Changes............................................................................................... 7 IV. Results and Discussion................................................................................................. 8 A. Aquatic Environment........................................................................................... 9

1. Surface Water........................................................................................... 9

2. Ground Water........................................................................................... 9

3. Fish......................................................................................................... 10

4. Sediment................................................................................................. 1 O B. Atmospheric Environment................................................................................. 1 O 1. Airborne.................................................................................................. 1 O

a. Air Particulates............................................................................. 1 O

b. Airborne Iodine............................................................................. 11

2. Terrestrial................................................................................................ 11

a. Milk............................................................................................... 11

b. Vegetation.................................................................................... 12 C. Ambient Gamma Radiation............................................................................... 12 D. Land Use Survey............................................................................................... 12 E. Errata Data........................................................................................................ 13 F. Summary of Results - Inter-laboratory Comparison Program............................ 13

- i -

Appendix A Tables Table A-1 Appendix B Tables Table B-1 Table 8-2 Figures Figure 8-1 Figure B-2 Figure B-3 Figure 8-4 Figure B-5 Appendix C Tables Table C-1.1 Table C-1.2 Table C-1.3 Table C-1.4 Table C-I1.1 Table C-I1.2 Appendices Radiological Environmental Monitoring Report Summary Radiological Environmental Monitoring Program Annual Summary for Byron Clean Energy Center, 2023 Location Designation, Distance & Direction, and Sample Collection &

Analytical Methods Radiological Environmental Monitoring Program - Sampling Locations, Distance and Direction, Byron Clean Energy Center, 2023 Radiological Environmental Monitoring Program - Summary of Sample Collection and Analytical Methods, Byron Clean Energy Center, 2023 Inner Ring and Special Interest OSLO Locations of the Byron Clean Energy Center, 2023 Outer Ring OSLO Locations of the Byron Clean Energy Center, 2023 Onsite Air Sampling Locations of the Byron Clean Energy Center, 2023 Offsite Air Sampling Locations of the Byron Clean Energy Center, 2023 Ingestion and Waterborne Exposure Pathway Sampling Locations of the Byron Clean Energy Center, 2023 Data Tables and Figures Concentrations of Gross Beta in Surface Water Samples Collected in the Vicinity of Byron Clean Energy Center, 2023.

Concentrations of Tritium in Surface Water Samples Collected in the Vicinity of Byron Clean Energy Center, 2023.

Concentrations of Nickel-63 in Surface Water Samples Collected in the Vicinity of Byron Clean Energy Center, 2023 Concentrations of Gamma Emitters in Surface Water Samples Collected in the Vicinity of Byron Clean Energy Center, 2023 Concentrations of Tritium in Ground Water Samples Collected in the Vicinity of Byron Clean Energy Center, 2023 Concentrations of Gamma Emitters in Ground Water Samples II

Collected in the Vicinity of Byron Clean Energy Center, 2023 Table C-I11.1 Concentrations of Nickel-63 and Gamma Emitters in Fish Samples Collected in the Vicinity of Byron Clean Energy Center, 2023 Table C-IV.1 Concentrations of Nickel-63 and Gamma Emitters in Sediment Samples Collected in the Vicinity of Byron Clean Energy Center, 2023 Table C-V.1 Concentrations of Gross Beta in Air Particulate Samples Collected in the Vicinity of Byron Clean Energy Center, 2023 Table C-V.2 Monthly and Yearly Mean Values of Gross Beta Concentrations in Air Particulate Samples Collected in the Vicinity of Byron Clean Energy Center, 2023 Table C-V.3 Concentrations of Gamma Emitters in Air Particulate Samples Collected in the Vicinity of Byron Clean Energy Center, 2023 Table C-Vl.1 Concentrations of 1-131 in Air Iodine Samples Collected in the Vicinity of Byron Clean Energy Center, 2023 Table C-Vll.1 Concentrations of 1-131 in Milk Samples Collected in the Vicinity of Byron Clean Energy Center, 2023 Table C-Vll.2 Concentrations of Gamma Emitters in Milk Samples Collected in the Vicinity of Byron Clean Energy Center, 2023 Table C-Vlll.1 Concentrations of Gamma Emitters in Vegetation Samples Collected in the Vicinity of Byron Clean Energy Center, 2023 Table C-IX.1 Quarterly OSLO Results for Byron Clean Energy Center, 2023 Table C-IX.2 Mean Quarterly OSLO Results for the Inner Ring, Outer Ring, Special Interest, Other and Control Locations for Byron Clean Energy Center, 2023 Table C-IX.3 Summary of the Ambient Dosimetry Program for Byron Clean Energy Center, 2023 Figures Figure C-1 Figure C-2 Figure C-3 Figure C-4 Figure C'-5 Surface Water - Gross Beta - Stations BY-12 and BY-29 (C) Collected in the Vicinity of BCEC, 2000 - 2023 Surface Water - Tritium - Stations BY-12 and BY-29 (C) Collected in the Vicinity of BCEC, 2000 - 2023 Ground Water - Tritium - Station BY-14-1 Collected in the Vicinity of BCEC, 2000 - 2023 Ground Water - Tritium - Station BY-18-1 Collected in the Vicinity of BCEC, 2010 - 2023 Ground Water - Tritium - Station BY-32 Collected in the Vicinity of BCEC, 2006 - 2023 iii

Figure C-6 Figure C-7 Figure C-8 Figure C-9 Figure C-10 Figure C-11 Figure C-12 Appendix D Tables Ground Water - Tritium - Station BY-35 Collected in the Vicinity of BCEC, 2006 - 2023 Ground Water - Tritium - Stations BY-37 and BY-38 Collected in the Vicinity of BCEC, 2006 - 2023 Air Particulate - Gross Beta - Stations BY-08 (C) and BY-21 Collected in the Vicinity of BCEC, 2000 - 2023 Air Particulate - Gross Beta - Stations BY-22 and BY-23 Collected in the Vicinity of BCEC, 2000 - 2023 Air Particulate - Gross Beta - Station BY-24 Collected in the Vicinity of BCEC, 2000 - 2023 Air Particulate - Gross Beta - Stations BY-01 and BY-04 Collected in the Vicinity of BCEC, 2005 - 2023 Air Particulate - Gross Beta - Station BY-06 Collected in the Vicinity of BCEC, 2005 - 2023 Inter-Laboratory Comparison Program Table D-1 Analytics Environmental Radioactivity Cross Check Program Teledyne Brown Engineering, 2023 Table D-2 DOE's Mixed Analyte Performance Evaluation Program (MAPEP)

Teledyne Brown Engineering, 2023 Table 0-3 ERA Environmental Radioactivity Cross Check Program Teledyne Brown Engineering, 2023 Appendix E Effluent Report Appendix E-1 Data Tables and Figures Appendix F Meteorological Data Appendix G Errata data Appendix H Annual Radiological Groundwater Protection Program Report (ARGPPR)

IV

I.

Summary and Conclusions This report on the Radiological Environmental Monitoring Program conducted for the Byron Clean Energy Center by Constellation covers the period 1 January 2023 through 31 December 2023. During that time period, 1,452 analyses were performed on 1,290 samples. In assessing all the data gathered for this report and comparing these results with preoperational data, it was concluded that the operation of BCEC had no adverse radiological impact on the environment.

Surface water samples were analyzed for concentrations of gross beta, tritium (H-3), nickel-63 (Ni-63), and gamma-emitting nuclides. Ground water samples were analyzed for concentrations of tritium and gamma-emitting nuclides. Gross beta activities detected were consistent with those detected in previous years. All surface water samples analyzed for Ni-63 were less than the minimum detectable concentration. Tritium detected in downstream surface water was well below reportable limits and consistent with expected levels as a result of permitted liquid discharges.

Fish (commercially and/or recreationally important species) and sediment samples were analyzed for concentrations of Ni-63 and gamma-emitting nuclides. No fission or activation products were detected in fish or in sediment samples.

Air particulate samples were analyzed for concentrations of gross beta and gamma-emitting nuclides. No fission or activation products were detected.

High sensitivity iodine-131 (1-131) analyses were performed on weekly air samples. All results were less than the minimum detectable concentration for 1-131.

Cow milk samples were analyzed for concentrations of 1-131 and gamma-emitting nuclides. All I-131 results were below the minimum detectable activity. No fission or activation products were found.

Food Product samples were analyzed for concentrations of gamma-emitting nuclides. No fission or activation products were detected.

Environmental gamma radiation measurements were performed quarterly using Optically Stimulated Luminescence Dosimeters (OSLO). Beginning in 2012, Exelon Nuclear changed the type of dosimetry used for the Radiological Environmental Monitoring Program (REMP). Optically Stimulated Luminescent Dosimetry were deployed, and Thermoluminescent Dosimetry (TLD) were discontinued. This change may have resulted in a step change in readings, up or down, depending on site characteristics. The relative comparison to control locations remains valid. OSLO technology is different than that used in a TLD but has the same purpose (to measure direct radiation).

11.

Introduction Byron Station, a two-unit PWR station, is located about two miles east of the Rock River and approximately three miles southwest of Byron in Ogle County, Illinois.

The reactors are designed to have capacities of 1,268 and 1,241 MW gross, respectively. Unit One loaded fuel in November 1984 and went online February 2, 1985. Unit Two went on line January 9, 1987. The station has been designed to keep releases to the environment at levels below those specified in the codes of federal regulations.

This report covers those analyses performed by Teledyne Brown Engineering (TBE) and Landauer on samples collected during the period 1 January 2023 through 31 December 2023.

A.

Objectives of the REMP The objectives of the REMP are to:

1.

Provide data on measurable levels of radiation and radioactive materials in the site environs.

2.

Evaluate the relationship between quantities of radioactive material released from the plant and resultant radiation doses to individuals from principal pathways of exposure.

B.

Implementation of the Objectives The implementation of the objectives is accomplished by:

1.

Identifying significant exposure pathways

2.

Establishing baseline radiological data of media within those pathways

3.

Continuously monitoring those media before and during Station operation to assess Station radiological effects (if any) on man and the environment Ill.

Program Description A.

Sample Collection Samples for the BCEC REMP were collected for Constellation by Environmental Inc. (Midwest Labs). This section describes the general collection methods used by Environmental Inc. to obtain environmental samples for the BCEC REMP in 2023. Sample locations and descriptions can be found in Table B-1 and Figures B-1 through 8-5, Appendix B.

Aquatic Environment The aquatic environment was evaluated by performing radiological analyses on samples of surface water, ground water, fish and sediment.

Two gallon water samples were collected weekly from two surface water locations (BY-12 and BY-29 [Control location]) and quarterly from six ground water locations (BY-14-1, BY-18-1, BY-32, BY-35, BY-37 and BY-38). All samples were collected in new unused plastic bottles, which were rinsed with source water prior to collection. Fish samples comprising the flesh of freshwater drum, golden redhorse and shorthead red horse, were collected semiannually at two locations, BY-29 (control) and BY-31.

Sediment samples composed of recently deposited substrate were collected at two locations semiannually, BY-12 and BY-34 (control).

Atmospheric Environment The atmospheric environment was evaluated by performing radiological analyses on samples of air particulate, and airborne iodine. Airborne iodine and particulate samples were collected and analyzed weekly at eight locations (BY-01, BY-04, BY-06, BY-08, BY-21, BY-22, BY-23 and BY-24).

The control location was BY-08. Airborne iodine and air particulate samples were obtained at each location, using a vacuum pump with charcoal and glass fiber filters attached. The pumps ran continuously and sampled air at the rate of approximately one cubic foot per minute. The air filters and air iodine samples were replaced weekly and sent to the laboratory for analysis.

Terrestrial Environment The terrestrial environment was evaluated by performing radiological analyses on samples of milk and food products. Milk samples were collected monthly from January through April and November through December, and biweekly May through October. The control location was BY-26-2 and the indicator location was BY-20-1. All samples were collected in new unused two gallon plastic bottles from the bulk tank at each location, preserved with sodium bisulfite and shipped promptly to the laboratory.

Food products were collected annually in July and August at five locations (BY-Control, BY-Quad 1, BY-Quad 2, BY-Quad 3 and BY-Quad 4). Various types of samples were collected and placed in new unused plastic bags and sent to the laboratory for analysis.

Ambient Gamma Radiation Beginning in 2012, Exelon Nuclear changed the type of dosimetry used for the Radiological Environmental Monitoring Program (REMP). Optically Stimulated Luminescent Dosimetry (OSLO) were deployed, and Thermoluminescent Dosimetry (TLD) were discontinued. This change may result in a step change in readings, up or down, depending on site characteristics. The relative comparison to control locations remains valid.

OSLO technology is different than that used in a TLD but has the same purpose (to measure direct radiation).

In recent years, the industry recognized the need for a standard method of reporting environmental dosimetry results. In 2018, Exelon Nuclear began assessing facility-related dose in accordance with ANSI N13.37-2014, Environmental Dosimetry - Criteria for System Design and Implementation.

This standard is applicable to passive environmental dosimetry systems used to monitor areas surrounding radiological facilities to assess potential facility-related radiation doses and to verify compliance with public dose limits. Such environmental dosimetry systems include dosimeters which accumulate radiation dose and any readout device required to process the dosimeters. Passive dosimeters include optically stimulated luminescence (OSL) dosimeters which are deployed at field locations around a facility and exchanged periodically (e.g., quarterly). Facility-related dose is calculated using a statistical model that uses baseline historical data and accounts for transit and deploy dose. In 2023, none of the Byron Station field locations listed in this report exhibited facility-related dose as calculated in accordance with this standard.

Each location consisted of 2 OSLO sets. The OSLDs were exchanged quarterly and sent to Landauer for analysis. The OSLDs were placed at locations on and around the BCEC Station site as follows:

An inner ring consisting of 16 locations (BY-101, BY-102, BY-103, BY-104, BY-105, BY-106, BY-107, BY-108, BY-109, BY-110, BY-111, BY-112, BY-113, BY-114, BY-115 and BY-116) near and within the site perimeter representing fence post doses (i.e., at locations where the doses will be potentially greater than maximum annual off-site doses) from BCEC releases.

An outer ring consisting of 16 locations (BY-201, BY-202, BY-203, BY-204, BY-205, BY-206, BY-207, BY-208, BY-209, BY-210, BY-211, BY-212, BY-213, BY-214, BY-215 and BY-216) extending to approximately 5 miles from the site designed to measure possible exposures to close-in population.

A special interest set consisting of seven locations (BY-301-1, BY-301-2, BY-309-1, BY-309-2, BY-309-3, BY-309-4, and BY-314-2) to measure possible exposures from on-site storage facilities.

An other set consisting of seven locations (BY-01, BY-04, BY-06, BY-21, BY-22, BY-23 and BY-24) at locations where air samplers are present.

The balance of one location (BY-08) representing the control area.

The specific OSLO locations were determined by the following criteria:

1.

The presence of relatively dense population;

2.

Site meteorological data taking into account distance and elevation for each of the sixteen-22 1 /2 degree sectors around the site, where estimated annual dose from BCEC, if any, would be most significant;

3.

On hills free from local obstructions and within sight of the vents (where practical);

4.

And near the closest dwelling to the vents in the prevailing downwind direction if applicable.

Two OSLDs were placed at each location above ground level. The OSLDs were exchanged quarterly and sent to Landauer for analysis.

B.

Sample Analysis This section describes the general analytical methodologies used by TBE to analyze the environmental samples for radioactivity for the BCEC REMP in 2023. The analytical procedures used by the laboratory are listed in Table B-2.

In order to achieve the stated objectives, the current program includes the following analyses:

1.

Concentrations of beta emitters in surface water and air particulates

2.

Concentrations of gamma emitters in ground and surface water, air particulates, milk, fish, sediment and vegetation

3.

Concentrations of tritium in ground and surface water

4.

Concentrations of iodine-131 in air and milk

5.

Concentrations of nickel-63 in surface water, fish and sediment

6.

Ambient gamma radiation levels at various site environs C.

Data Interpretation The radiological and direct radiation data collected prior to Byron Clean Energy Center becoming operational were used as a baseline with which these operational data were compared. For the purpose of this report, Byron Clean Energy Center was considered operational at initial criticality.

In addition, data were compared to previous years' operational data for consistency and trending. Several factors were important in the interpretation of the data:

1.

Lower Limit of Detection and Minimum Detectable Concentration The lower limit of detection (LLD) was defined as the smallest concentration of radioactive material in a sample that would yield a net count (above background) that would be detected with only a 5%

probability of falsely concluding that a blank observation represents a "real" signal. The LLD was intended as a before-the-fact estimate of a system (including instrumentation, procedure and sample type) and not as an after-the-fact criteria for the presence of activity. All analyses were designed to achieve the required BCEC detection capabilities for environmental sample analysis.

The minimum detectable concentration (MDC) is defined above with the exception that the measurement is an after-the-fact estimate of the presence of activity.

2.

Net Activity Calculation and Reporting of Results Net activity for a sample was calculated by subtracting background activity from the sample activity. Since the REMP measures extremely small changes in radioactivity in the environment, background variations may result in sample activity being lower than the background activity, effecting a negative number. An MDC was reported in all cases where positive activity was not detected.

Gamma spectroscopy results for each type of sample were grouped as follows:

For surface water, ground water, milk and vegetation, twelve nuclides, Mn-54, Co-58, Fe-59, Co-60, Zn-65, Nb-95, Zr-95, 1-131, Cs-134, Cs-137, Ba-140 and La-140 were reported.

For fish, sediment, and air particulates, eleven nuclides, Mn-54, Co-58, Fe-59, Co-60, Zn-65, Nb-95, Zr-95, Cs-134, Cs-137, Ba-140 and La-140 were reported.

Means and standard deviations of the results were calculated. The standard deviations represent the variability of measured results for different samples rather than single analysis uncertainty.

D.

Program Exceptions For 2023, the BCEC REMP had a sample recovery rate in excess of 99%.

Sample anomalies and missed samples are listed in the following tables:

TABLE D-1 LISTING OF SAMPLE ANOMALIES Sample Location Collection Reason Type Code Date AP/Al BY-21 01/10/23 Timer indicated 7 hours8.101852e-5 days 0.00194 hours 1.157407e-5 weeks 2.6635e-6 months less due to power outage.

AP/Al BY-04 01/31/23 Pump indicated lower reading of 1269 hours0.0147 days 0.353 hours 0.0021 weeks 4.828545e-4 months . During the 2/7 collection it was found not working and replaced on 2/8.

AP/Al BY-01 02/14//23 Timer broken - replaced on 2/8.

AP/Al BY-04 02/14/23 Timer indicates lower reading - timer replaced on 28.

M BY-20-1 04/04/23 Unable to collect milk. Farmer suspended operation due to the main computer destruction. Sample collected 4/25.

AP/Al BY-22 04/11/23 Timer indicated 335.3 due to improper reset during the previous week collection. Run calculated.

AP/Al BY-24 04/18/23 Timer indicated lower reading of 146.7 possibly due to power outage at station.

AP/Al BY-06 05/09/23 Timer indicated lower reading of 99.9 due to local power outage.

Timer indicated 7.4 hours4.62963e-5 days 0.00111 hours 6.613757e-6 weeks 1.522e-6 months less than expected, possibly due APA!

BY-22 10/24/23 to power outage Following week's timer showed expected number of hours.

TABLE D-2 LISTING OF MISSED SAMPLES Sample Location Collection Reason Type Code Date SW BY-29 01/03/23 Unable to collect water; river frozen AP BY-24 04/04/23 Filter washed out by heavy rains.

Pump stopped working after 132 hours0.00153 days 0.0367 hours 2.18254e-4 weeks 5.0226e-5 months due to tripped AP/Al BY-22 06/13/23 breaker. Pump restarted. During 6/20 collection it was 06/27/23 determined to be a faulty plug (burned wire). Pump was exchanged.

Each program exception was reviewed to understand the causes of the program exception. Sampling and maintenance errors were reviewed with the personnel involved to prevent recurrence. Occasional equipment breakdowns and power outages were unavoidable.

The overall sample recovery rate indicates that the appropriate procedures and equipment are in place to assure reliable program implementation.

E.

Program Changes There were no program changes in 2023. I I

i

IV.

Results and Discussion A

Aquatic Environment

1.

Surface Water Samples were taken weekly and composited monthly at two locations (BY-12 and BY-29). Of these locations only BY-12 located downstream, could be affected by Byron Clean Energy Center's effluent releases. The following analyses were performed:

Gross Beta Samples from both locations were analyzed for concentrations of gross beta (Table C-1.1, Appendix C). The values ranged from 3.5 to 9.2 pCi/L. Concentrations detected were consistent with those detected in previous years (Figure C-1, Appendix C).

Tritium Quarterly composites of weekly collections were analyzed for tritium activity (Table C-1.2, Appendix C). Tritium was detected in three samples. (Figure C-2, Appendix C). The concentrations ranged from 552 to 5,960 pCi/L. Tritium detected in downstream surface water was well below reportable limits and consistent with expected levels as a result of permitted liquid discharges.

Nickel Samples from both locations were analyzed for concentrations of Ni-63 (Table C-1.3, Appendix C). All results were less than the minimum detectable concentration.

Gamma Spectrometry Samples from both locations were analyzed for gamma-emitting nuclides (Table C-1.4, Appendix C). No nuclides were detected, and all required LLDs were met.

2.

Ground Water Quarterly grab samples were collected at six locations (BY-14-1, BY-18-1, BY-32, BY-35, BY-37 and BY-38). These locations could be affected by Byron Clean Energy Center's effluent releases.

The following analyses were performed:

Tritium Quarterly grab samples from the locations were analyzed for tritium activity (Table C-II.1, Appendix C). No tritium was detected, and the required LLD was met (Figures C-3 through C-7, Appendix C).

Gamma Spectrometry Samples from all locations were analyzed for gamma-emitting nuclides (Table C-I1.2 Appendix C). No nuclides were detected, and all required LLDs were met.

3.

Fish Fish sarnples comprised of freshwater drum, golden red horse and shorthead red horse were collected at two locations (BY-29 and BY-31) semiannually. Location BY-31 could be affected by Byron Clean Energy Center's effluent releases. The following analyses were performed:

Nickel The edible portion of fish samples from both locations was analyzed for Ni-63 (Table C-II1.1, Appendix C). Nickel-63 was not detected and the required LLD was met.

Gamma Spectrometry The edible portion of fish samples from both locations was analyzed for gamma-emitting nuclides (Table C-II1.1, Appendix C). No nuclides were detected, and all required LLDs were met.

4.

Sediment Aquatic sediment samples were collected at two locations (BY-12 and BY-34) semiannually. BY-12, located downstream, could be affected by Byron Clean Energy Center's effluent releases. The following analyses were performed:

Nickel Sediment samples from both locations were analyzed for Ni-63 (Table C-IV.1, Appendix C). Ni-63 was not detected and the required LLD was met.

Gamma Spectrometry Sediment samples from both locations were analyzed for gamma-emitting nuclides (Table C-IV.1, Appendix C). No fission or activation products were detected and all required LLDs were met.

B.

Atmospheric Environment

1.

Airborne

a.

Air Particulates Continuous air particulate samples were collected from eight locations on a weekly basis. The eight locations were separated into three groups: Nearsite samplers within 4 km of the site (BY-21, BY-22, BY-23 and BY-24), Far Field samplers between 4 and 10 km of the site (BY-01, BY-04 and BY-06) and the Control sampler between 10 and 30 km from the site (BY-08). The following analyses were performed:

Gross Beta Weekly samples were analyzed for concentrations of beta emitters (Table C-V.1 and C-V.2, Appendix C). Detectable gross beta activity was observed at all locations. Comparison of results among the three groups aid in determining the effects, if any, resulting from the operation of BCEC.

The results from the Nearsite locations (Group I) ranged from 8 to 37E-3 pCi/m3 with a mean of 21 E-3 pCi/m3. The results from the Far Field locations (Group II) ranged from 10 to 36E-3 pCi/m3 with a mean of 20E-3 pCi/m3. The results from the Control location (Group Ill) ranged from 8 to 42E-3 pCi/m3 with a mean of 22E-3 pCi/m3. Comparison of the 2023 air particulate data with previous year's data indicate no effects from the operation of BCEC. In addition, a comparison of the weekly mean values for 2023 indicate no notable differences among the three groups.

(Figures C-8 through C-12, Appendix C)

Gamma Spectrometry Weekly samples were composited quarterly and analyzed for gamma-emitting nuclides (Table C-V.3, Appendix C). No nuclides were detected, and all required LLDs were met.

b.

Airborne Iodine Continuous air samples were collected from eight locations (BY-01, BY-04, BY-06, BY-08, BY-21, BY-22, BY-23 and BY-24) and analyzed weekly for 1-131 (Table C-Vl.1, Appendix C). All results were less than the minimum detectable concentration for 1-131.

2.

Terrestrial

a. Milk Samples were collected from two locations (BY-20-1 and BY-26-2) monthly from January to April and November through December, and biweekly May through October. The following analyses were performed:

lodine-131 Milk samples from all locations were analyzed for concentrations of 1-131 (Table C-Vll.1, Appendix C). No nuclides were detected, and all required LLDs were met.

Gamma Spectrometry Each milk sample was analyzed for concentrations of gamma-emitting nuclides (Table C-Vll.2, Appendix C). No nuclides were detected, and all required LLDs were met.

b. Vegetation Vegetation samples weie collected at five locations (BY-Control, BY-Quad 1, BY-Quad 2, BY-Quad 3 and BY-Quad 4). Four locations (BY-Quad 1, BY-Quad 2, BY-Quad 3 and BY-Quad 4) could be affected by Byron Clean Energy Center's effluent releases. The following analysis was performed:

Gamma Spectrometry Samples from all locations were analyzed for gamma-emitting nuclides (Table C-Vlll.1, Appendix C). No nuclides were detected, and all required LLDs were met.

C.

Ambient Gamma Radiation Ambient gamma radiation levels were measured utilizing OSLDs.

Ninety-one OSLO locations were established around the site. Results of OSLO measurements are listed in Tables C-IX.1 to C-IX.3, Appendix C.

All OSLO measurements were below 29 mR/standard quarter, with a range of 15 to 28 mR/standard quarter. A comparison of the Inner Ring, Outer Ring, Special Interest, Other and Control Location data indicate that the ambient gamma radiation levels were comparable among the groups.

D.

Land Use Survey A Land Use Survey conducted during August 2023 around the Byron Clean Energy Center (BCEC) was performed by Environmental Inc. (Midwest Labs) for Constellation to comply with the Byron Clean Energy Center's Offsite Dose Calculation Manual. The purpose of the survey was to document the nearest resident, livestock, and milk producing animals in each of the sixteen 22 1/2 degree sectors. The results of this survey are summarized as follows:

Distance in Miles from the SCEC Vent Stacks Sector Residence Livestock Milk Farm Miles Miles Miles A

N 1.2 5.9 B

NNE 1.6 6.2 C

NE 1.1 2.0 D

ENE 1.4 3.7 E

E 1.0 4.2 F

ESE 1.5 1.5 G

SE 1.7 3.5 H

SSE 0.7 3.3 J

s 0.6 0.7 K

SSW 0.7 0.7 L

SW 0.8 2.0 M

wsw<aJ 1.6 0.8 4.5 N

w 1.8 3.2 p

WNW 1.6 1.6 11.5 Q

NW 0.8 1.5 R

NNW 0.9 1.4

<a! Denotes the nearest industrial facility located at 1.5 miles E.

Errata Data There was no errata data for 2023.

F.

Summary of Results - Inter-Laboratory Comparison Program The TSE Laboratory analyzed Performance Evaluation (PE) samples of air particulate, air iodine (charcoal), milk, soil, vegetation and water matrices that represent test & matrix combinations available for REMP programs (Appendix D). The PE sample matrices were chosen based on the types of samples submitted to the primary laboratory for analysis. The selected parameters for the PE samples are based on the appropriate matrices, methodologies and geometries, which include geometries that are comparable. The PE samples, supplied by Analytics Inc., Environmental Resource Associates (ERA) and DOE's Mixed Analyte Performance Program (MAPEP) were evaluated against the following pre-set acceptance criteria:

1.

Analytics Evaluation Criteria Analytics' evaluation report provides a ratio of laboratory results and Analytics' known value. Since flag values are not assigned by Analytics, TSE-ES evaluates the reported ratios based on internal QC requirements, which are based on the DOE MAPEP criteria.

2.

ERA Evaluation Criteria ERA's evaluation report provides an acceptance range for control and warning limits with associated flag values. ERA's acceptance limits are established per the USEPA, NELAC, state specific PT program requirements or ERA's SOP for the Generation of Performance Acceptance Limits, as applicable. The acceptance limits are either determined by a regression equation specific to each analyte or a fixed percentage limit promulgated under the appropriate regulatory document.

3.

DOE Evaluation Criteria MAPEP's evaluation report provides an acceptance range with associated flag values. MAPEP defines three levels of performance:

Acceptable (flag = "A") - result within +/- 20% of the reference value Acceptable with Warning (flag = "W") - result falls in the +/- 20% to

+/- 30% of the reference value Not Acceptable (flag = "N") - bias is greater than 30% of the reference value Note: The Department of Energy (DOE) Mixed Analyte Performance Evaluation Program (MAPEP) samples are created to mimic conditions found at DOE sites which do not resemble typical environmental samples obtained at commercial nuclear power facilities.

For the TSE laboratory, 124 out of 131 analyses performed met the specified acceptance criteria. Seven analyses did not meet the specified acceptance criteria and were addressed through the TSE Corrective Action Program. A summary is found below:

1.

The MAPEP February 2023 Soil Ni-63 result was evaluated as Not Acceptable. TBE's reported value was 294 Bq/kg and the known result was 1130 Bq/kg (range 791 - 1469). The sample was reprepped by a different (senior) lab technician with results of 1120 & 1250 Bq. It was determined that there was a difference between the two techs during the sample prep (technique) and the procedure was revised to reflect these differences including using a specific aliquot amount (NCR 23-08)

2.

The MAPEP February 2023 vegetation Sr-90 result was evaluated as Not Acceptable. The reported value was 0.05 Bq (not detected) and the known result was a "false positive". This was considered to be a statistical failure because TBE's reported result with 3 times the uncertainty resulted in a slightly positive net result (0.03194 Bq/kg). The reported result was significantly below TBE's average detection limit for vegetation samples.

(NCR 23-09)

3.

The ERA RAD April 2023 water Ba-133 result was evaluated as Not Acceptable. The reported value was 26.0 pCi/L and the known was 22.3 (acceptance range 17.1 - 25.8 pCi) or 117% of the known (acceptable for TBE QC). The sample was used as the workgroup duplicate with a result of 25.4 (114%). The sample had also been counted on a different detector with a result of 21.9 (98%). This was TBE's first failure for Ba-133.

(NCR 23-10)

4.

The MAPEP August 2023 soil Fe-55 result was evaluated as Not Acceptable.

The reported value was 346 Bq/kg and the known result was 1280 (acceptance range of 896-1664 Bq/kg). This was TBE's initial evaluation for Fe-55 in soils. The result was received at the end of December and the root cause is under investigation. No client samples were associated with this cross-check. (CAR 23-31)

5.

The Analytics September 2023 milk Sr-90 result was evaluated as Not Acceptable. The reported resuit was 7.28 pCi/L and the known result was 12.8 (57% of known). This sample was used as the workgroup duplicate and the carrier yields for both samples were 107% and 75%. The LCS recovery for the workgroup was at 106%. The ERA drinking water Sr-90 cross check that was analyzed around the same time was acceptable at 108%. There was no explanation for the failure. This is the first low biased failure for Sr-90 milk. The last failure (high) was in 2016. (NCR 23-24)

6.

The ERA RAD October 2023 water Gross Alpha result was evaluated as Not Acceptable. The reported result was 53.2 pCi/L and the known result was 70.6 (acceptable range of 54.0 - 87.2 pCi/L). The reported result was the workgroup duplicate and was within 75% of the known value (within TBE QC range). The original result was 63.3 pCi/L (90% of the known). Because the LCS result was biased slightly high, the decision was made to report the lower value. (NCR 23-20)

7.

The ERA RAD October 2023 water 1-131 result was evaluated as Not Acceptable. The reported value was 23.5 pCi/L and the known result was 29.7 (acceptable range of 25.8 - 33.6) The reported result was 79% of the known, which is within the acceptable TBE QC range. The workgroup was reviewed with no anomalies found. The LCS/LCSD results were 109% and 86.1 %. The sample was not processed in a timely manner as per the ERA instructions which stated to analyze shortly after receipt due to the short half-life. Going forward, the QA &/or Lab Mgr. will ensure that this analysis is started sooner.

(NCR 23-21)

The Inter-Laboratory Comparison Program provides evidence of "in control" counting systems and methods, and that the laboratories are producing accurate and reliable data.

APPENDIX A RADIOLOGICAL ENVIRONMENTAL MONITORING REPORT

SUMMARY

Intentionally left blank

TABLE A-1 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANNUAL

SUMMARY

FOR BYRON CLEAN ENERGY CENTER, 2023 NAME OF FACILITY:

BYRON CLEAN ENERGY CENTER DOCKET NUMBER:

50-454 & 50-455 LOCATION OF FACILITY:

BYRON, IL REPORTING PERIOD:

2023 INDICATOR CONTROL REQUIRED LOCATIONS LOCATION LOCATION WITH HIGHEST ANNUAL MEAN (M)

NUMBER OF MEDIUM OR TYPES OF NUMBER OF LOWER LIMIT MEAN(M)

MEAN (M)

STATION#

NONROUTINE PATHWAY SAMPLED ANALYSIS ANALYSES OF DETECTION (F)

(F)

NAME REPORTED (Uint of Measurement)

PERFORMED PERFORMED (LLD)

RANGE RANGE RANGE DISTANCE AND DIRECTION MEASUREMENTS SURFACE WATER GR-B 24 4

5.2 4.8 5.2 BY-12 INDICATOR 0

(PCI/L!TER)

(10/12)

(11/12)

(10/12)

OREGON POOL OF ROCK RIVER - DOWNSTREAM 3.5-9.2 35-7.1 3.5-9.2 4.5 MILES SSW OF SITE H-3 8

200 2495

<LLD 2495 BY-12 INDICATOR 0

(3/4)

OREGON POOL OF ROCK RIVER - DOWNSTREAM 552 - 5960 552 - 5960 4.5 MILES SSW OF SITE Nl-63 24 30

<LLD

<LLD 0

GAMMA 24 MN-54 15

<LLD

<LLD 0

CO-58 15

<LLD

<LLD 0

Ff.59 30

<LLD

<LLD 0

)>

CO-60 15

<LLD

<LLD 0

I ZN-65 30

<LLD

<LLD 0

NB-95 15

<LLD

<LLD 0

ZR-95 30

<LLD

<LLD 0

1-131 15

<LLD

<LLD 0

CS-134 15

<LLD

<LLD 0

CS-137 18

<LLD

<LLD 0

BA-140 60

<LLD

<LLD 0

LA-140 15

<LLD

<LLD 0

GROUND WATER H-3 24 200

<LLD NA 0

(PCl!LITER)

GAMMA 24 MN-54 15

<LLD NA 0

CO-58 15

<LLD NA 0

FE-59 30

<LLD NA 0

CO-60 15

<LLD NA 0

ZN-65 30

<LLD NA 0

NB-95 15

<LLD NA 0

ZR-95 30

<LLD NA 0

1-131 15

<LLD NA 0

CS-134 15

<LLD NA 0

CS-137 18

<LLD NA 0

BA-140 60

<LLD NA 0

LA-140 15

<LLD NA 0

(M) The Mean Values are calculated using the positive values. (F) Fraction of detectable measurement are indicated in parentheses.

TABLE A-1 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANNUAL

SUMMARY

FOR BYRON CLEAN ENERGY CENTER, 2023 NAME OF FACILITY:

BYRON CLEAN ENERGY CENTER DOCKET NUMBER:

50-454 & 50-455 LOCATION OF FACILITY:

BYRON, IL REPORTING PERIOD:

2023 INDICATOR CONTROL REQUIRED LOCATIONS LOCATION LOCATION WITH HIGHEST ANNUAL MEAN (M)

NUMBER OF MEDIUM OR TYPES OF NUMBER OF LOWER LIMIT MEAN (M)

MEAN (M)

STATION#

NONROUTINE PATHWAY SAMPLED ANALYSIS ANALYSES OF DETECTION (F)

(F)

NAME REPORTED (Uint of Measurement)

PERFORMED PERFORMED (LLD)

RANGE RANGE RANGE DISTANCE AND DIRECTION MEASUREMENTS FISH Nl-63 8

260

<LLD

<LLD 0

(PCIILITER)

GAMMA 8

MN-54 130

<LLD

<LLD 0

CO-58 130

<LLD

<LLD 0

FE-59 260

<LLD

<LLD 0

CO-60 130

<LLD

<LLD 0

ZN-65 260

<LLD

<LLD 0

NB-95 NA

<LLD

<LLD 0

ZR-95 NA

<LLD

<LLD 0

CS-134 130

<LLD

<LLD 0

CS-137 150

<LLD

<LLD 0

BA-140 NA

<LLD

<LLD 0

LA-140 NA

<LLD

<LLD 0

SEDIMENT Nl-63 4

260

<LLD

<LLD 0

)>

(PCl!KG DRY)

GAMMA 4

I r,J MN-54 NA

<LLD

<LLD 0

CO-58 NA

<LLD

<LLD 0

FE-59 NA

<LLD

<LLD 0

CO-60 NA

<LLD

<LLD 0

ZN-65 NA

<LLD

<LLD 0

NB-95 NA

<LLD

<LLD 0

ZR-95 NA

<LLD

<LLD 0

CS-134 150

<LLD

<LLD 0

CS-137 180

<LLD

<LLD 0

BA-140 NA

<LLD

<LLD 0

LA-140 NA

<LLD

<LLD 0

AIR PARTICULATE GR-8 422 10 21 22 22 BY-08 CONTROL 0

(E-3 PCl!CUMETER)

(368/369)

(53/53)

LEAF RIVER 8-37 8-42 8-42 6.8 MILES WNW OF SITE GAMMA 32 MN-54 NA

<LLD

<LLD 0

CO-58 NA

<LLD

<LLD 0

FE-59 NA

<LLD

<LLD 0

CO-60 NA

<LLD

<LLD 0

ZN-65 NA

<LLD

<LLD 0

NB-95 NA

<LLD

<LLD 0

ZR-95 NA

<LLD

<LLD 0

CS-134 15

<LLD

<LLD 0

CS-137 18

<LLD

<LLD 0

BA-140 NA

<LLD

<LLD 0

LA-140 NA

<LLD

<LLD 0

(M) The Mean Values are calculated using the positive values. (F) Fraction of detectable measurement are indicated in parentheses.

TABLE A-1 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANNUAL

SUMMARY

FOR BYRON CLEAN ENERGY CENTER, 2023 NAME OF FACILITY:

BYRON CLEAN ENERGY CENTER DOCKET NUMBER:

50-454 & 50-455 LOCATION OF FACILITY:

BYRON, IL REPORTING PERIOD:

2023 INDICATOR CONTROL REQUIRED LOCATIONS LOCATION LOCATION WITH HIGHEST ANNUAL MEAN (M)

NUMBER OF MEDIUM OR TYPES OF NUMBER OF LOWER LIMIT MEAN (M)

MEAN (M)

STATION#

NONROUTINE PATHWAY SAMPLED ANALYSIS ANALYSES OF DETECTION (F)

(F)

NAME REPORTED (Uint of Measurement)

PERFORMED PERFORMED (LLD}

RANGE RANGE RANGE DISTANCE AND DIRECTION MEASUREMENTS AIR IODINE GAMMA 422 (E-3 PCl!CUMETER) l-131 (GELi) 70

<LLD

<LLD 0

MILK 1-131 (LOWLVL) 38

<LLD

<LLD 0

(PCIILITER)

GAMMA MN-54 38 NA

<LLD

<LLD 0

CO-58 NA

<LLD

<LLD 0

FE-59 NA

<LLD

<LLD 0

CO-60 NA

<LLD

<LLD 0

ZN-65 NA

<LLD

<LLD 0

NB-95 NA

<LLD

<LLD 0

ZR-95 NA

<LLD

<LLD 0

)>

CS-134 15

<LLD

<LLD 0

t,J CS-137 18

<LLD

<LLD 0

BA-140 60

<LLD

<LLD 0

LA-140 15

<LLD

<LLD 0

VEGETATION GAMMA 16 (PCIIKG WET)

MN-54 NA

<LLD

<LLD 0

CO-58 NA

<LLD

<LLD 0

FE-59 NA

<LLD

<LLD 0

CO-60 NA

<LLD

<LLD 0

ZN-65 NA

<LLD

<LLD 0

NB-95 NA

<LLD

<LLD 0

ZR-95 NA

<LLD

<LLD 0

l-131 60

<LLD

<LLD 0

CS-134 60

<LLD

<LLD 0

CS-137 80

<LLD

<LLD 0

BA-140 NA

<LLD

<LLD 0

LA-140 NA

<LLD

<LLD DIRECT RADIATION OSLD-QUARTERL Y 332 NA 21.8 18.0 25.0 BY-212-4 INDICATOR 0

(MILLIREM!OTR.)

(328/328)

(4/4)

(4/4) 15-28 17 - 22 24-28 4.7 MILES WSW (M) The Mean Values are calculated using the positive values. (F) Fraction of detectable measurement are indicated in parentheses.

Intentionally left blank

APPENDIX 8 LOCATION DESIGNATION, DISTANCE & DIRECTION, AND SAMPLE COLLECTION & ANALYTICAL METHODS

Intentionally Left Blank

TABLE 8-1:

Radiological Environmental Monitoring Program - Sampling Locations, Distance and Direction, Byron Clean Energy Center, 2023 Location Location Description Distance & Direction From Site A

Surface Water BY-12 BY-29

8.

Ground/Well Water BY-14-1 BY-18-1 BY-32 BY-35 BY-37 BY-38 BY-20-1 BY-26-2 Oregon Pool of Rock River. Downstream Byron, Upstream ( control) 3200 North German Church Road Calhoun Krueger Well Vancko Well Cavage Well Steve Storz Well Ron Snodgrass Farm Joseph Akins Farm (control)

D.

Air Particulates/ Air Iodine BY-01 BY-04 BY-06 BY-08 BY-21 BY-22 BY-23 BY-24 E.

Fish BY-29 BY-31 F.

Sediment BY-12 BY-34 G.

Vegetation Quadrant 1 Quadrant 2 Quadrant 2 Quadrant 3 Quadrant 4 Quadrant 4 Control Byron Paynes Point Oregon Leaf River (control)

Byron Nearsite North Byron Nearsite Southeast Byron Nearsite South Byron Nearsite Southwest Byron Upstream (control)

Byron, Discharge Oregon Pool of Rock River, Downstream Rock River, Upstream of Discharge (control) 5186 Cox Road, Stillman Valley 4834 Brick Road, Oregon 410 Red Oak Lane, Chana, IL 555 Park Rd. Oregon 4615 N Razorville Road., Byron 880 Equestrian Dr., Bryon 2327 Route 251, Rochelle H.

Environmental Dosimetry - OSLO Inner Ring BY-101-1 and -2 BY-102-1 BY-102-2 BY-103-1 and -2 BY-103-3 BY-104-1 and -2 BY-104-3 BY-105-1 and -2 BY-106-1 and -2 BY-107-1 and -2 BY-107-3 B-1 4.5 miles SSW 3.0 miles N 1.0 miles SSE

0. 7 miles SSW 1.9 miles W 1.9 miles WNW 2.0 miles WNW 2.0 miles WNW 4.8 miles WSW 12.2 miles WNW 3.0 miles N 5.0 miles SE 4.7 miles SSW 7.0 miles WNW 0.3 miles N 0.4 miles SE 0.6 miles S 0.7 miles SW 3.0 miles N 2.6 miles WNW 4.6 miles SSW 2.6 miles WNW 4.6 miles E 4.9 miles SE 5.7 miles SE 3.7 miles SW 2.7 miles SW 1.8 miles W 20.7 miles SE 0.3 miles N 1.0 miles NNE 1.0 miles NNE 1.7 miles NE 0.4 miles NE 1.4 miles ENE 0.3 miles ENE 1.3 miles E 1.4 miles ESE 1.4 miles SE 0.4 miles SE

TABLE B-1:

Radiological Environmental Monitoring Program - Sampling Locations, Distance and Direction.

Byron Clean Energy Center, 2023 Location Location Description Distance & Direction From Site

~

BY-108-1 BY-108-2 BY-109-1 and -2 BY-110-1 and -2 BY-111-3 8Y-ii1-4 BY -112-3 and -4 BY-113-1 and-2 BY-114-1 and -2 BY-115-1 and -2 BY-116-1 and -2 BY-116-3 Outer Ring BY-201-3 BY-201-4 BY-202-1 BY-202-2 BY-203-1 BY-203-2 BY-204-1 BY-204-2 BY-205-1 and -2 BY-206-1 BY-206-2 BY-207-1 BY-207-2 BY-208-1 BY-208-2 BY-209-1 and -4 BY-210-3 and -4 BY-211-1 and -4 BY-212-1 and -4 BY-213-1 BY-213-4 BY-214-1 BY-214-4 BY-215-1 BY-215-4 BY-216-1 BY-216-2 Special Interest BY-301-1 BY-301-2 BY-309-1 BY-309-2 BY-309-3 BY-309-4 BY-314-2 Other BY-01-1 and-2 BY-04-1 and -2 BY-06-1 and-2 BY-21-1 and -2 BY-22-1 and -2 BY-23-1 and -2 BY-24-1 and -2 BY-08-1 and -2 8-2 o_ 7 miles SSE 0.6 miles SSE 0.6 miles S

0. 7 miles SSW 0.8 miles SW 0.9 miles SW 0.8 miles WSW 0.7 miles W 0.8 miles WNW 1.0 miles NW 1.4 miles NNW 0.9 miles NNW 4.4 miles N 4.4 miles N 4.4 miles NNE 4.8 miles NNE 4.8 miles NE 4.7 miles NE 4.1 miles ENE 4.0 miles ENE 3.8 miles E 4.0 miles ESE 4.3 miles ESE 4.2 miles SE 3.9 miles SE 4.0 miles SSE 3.8 miles SSE 4.0 miles S 3.9 miles SSW 4.9 miles SW 4.7 miles WSW 4.7 miles W 4.7 miles W 4.7 miles WNW 4.6 miles WNW 4.2 miles NW 4.2 miles NW 4.5 miles NNW 4.7 miles NNW 0.3 miles N 0.2 miles N 0.3 miles s 0.4 miles S 0.4 miles S 0.4 miles SSW 0.3 miles WNW 3.0 miles N 5.0 miles SE 4.7 miles SSW 0.3 miles N 0.4 miles SE 0.6 miles S 0.7 miles SW 7.0 miles WNW

TABLE B-2:

Radiological Environmental Monitoring Program - Summary of Sample Collection and Analytical Methods, Byron Clean Energy Center, 2023 Sample Analysis Sampling Method Analytical Procedure Number Medium Surface Water Gamma Spectroscopy Monthly composite from TBE TBE-2007 Gamma-Emitting Radioisotope Analysis weekly grab samples.

Surface Water

(.;.rn.c:c Ro.ta Monthly composite from TBE, TBE-2008 Gross Alpha and/or Gross Betel Activity in weekly grab samples Various Matrices Surface Water Nickel-63 Monthly composite from TBE. TBE-2013 Radionickel Activity in Various Matrices weekly grab samples.

Surface Water Tritium Quarterly composite from TBE. TBE-2011 Tritium Analysis in Drinking Water by Liquid weekly grab samples.

Scintillation Ground Water Gamma Spectroscopy Quarterly grab samples.

TBE. TBE-2007 Gamma-Emitting Radioisotope Analysis Ground Water Tritium Quarterly grab samples.

TBE. TBE-2011 Tritium Analysis in Drinking Water by Liquid Scintillation Semi-annual samples Fish Gamma Spectroscopy collected via electroshocking TBE, TBE-2007 Gamma-Emitting Radioisotope Analysis or other techniques Semi-annual samples Fish Nickel-63 collected via electroshocking TBE. TBE-2013 Radionickel Activity in Various Matrices or other techniques

-~-

Sediment Gamma Spectroscopy Semi-annual grab samples TBE, TBE-2007 Gamma-Emitting Radioisotope Analysis Sediment Nickel-63 Semi-annual grab samples TBE, TBE-2013 Radionickel Activity in Various Matrices One-week composite of TBE, TBE-2008 Gross Alpha and/or Gross Beta Activity in Air Particulates Gross Beta continuous air sampling through glass fiber filter paper Various Matrices Quarterly composite of Air Particulates Gamma Spectroscopy continuous air sapling TBE. TBE-2007 Gamma-Emitting Radioisotope Analysis through glass fiber filter paper One-week composite of Air Iodine Gamma Spectroscopy continuous air sampling TBE, TBE-2007 Gamma-Emitting Radioisotope Analysis through charcoal filter Bi-weekly grab sample when Milk 1-131 cows are on pasture TBE. TBE-2012 Radioiodine in Various Matrices Monthly all other times Bi-weekly grab sample when Milk Gamma Spectroscopy cows are on pasture.

TBE, TBE-2007 Gamma-Emitting Radioisotope Analysis Monthly all other times Vegetation Gamma Spectroscopy Annual grab samples.

TBE. TBE-2007 Gamma-Emitting Radioisotope Analysis Optically Stimulated Quarterly OSLDs comprised OSLO Luminescence of two Al2O3:C Landauer Landauer Incorporated Dosimetry Incorporated elements.

~---

-**-*a---

8-3

Figure B-1 Inner Ring and Special Interest OSLO Locations of the Byron Clean Energy Center, 2023 B-4

Figure B-2 Outer Ring OSLO Locations of the Byron Clean Energy Center, 2023 B-5

REFEFCENac:

!.NTED8TAT&'l 13Etl.OGIC8URVEY STil.l.MAN VAi.LEY QIJADfWQ..E, OR TOPOG'l'W"ilC. T.IS t.lNUTES SERJES tffl 0

1l2 1 IIM HI I

Q O.ILE AIRS.WPI.Nl 1..carnoN Figure B-3 Onsite Air Sampling Locations of the Byron Clean Energy Center, 2023 B-6 I

_I I

I I

I I I

\\

LEH' RIVER e AIR SAMPUNG LOCATION I) 1 t' '

0 2

+-J 2

3 4

5 MlllES I

l I ~a RT.IW STIU.MAH VAi.LEY OFFSITE DOSE CALCULATION MANUAL BYRON STATION FIGURE6-2 OFF SITE AIR S.AA!PLING LOCATIONS Figure 8-4 Offsite Air Sampling Locations of the Byron Clean Energy Center, 2023 B-7

r I

I,l

1. r flt f,Af'<f{!~I,~.

/

d:Af fil',ni 0

S,fr:J1Ml;NI

+ '.NAT!;:R a*rµ;~)N !;i'f_,1,T!f}N hl 0

r"LAN7" ! HJt!!D 01.:;,~,t.:~Gf f?

~ nu ~,u,.!',t Lt: y

+

)

i I

~ J)'i!J~t:~

I

1 f!}fl.].},~j 1

OFfSIH, DOSE: CALCULATION MAN>.}.4,l BYfK>N STATION INGES llO~J AND 'N,\\TERBORNE EXPOSURE r'ATHWAv SAMPLE i.OCXflONS Figure B-5 Ingestion and Waterborne Exposure Pathway Sampling Locations of the Byron Clean Energy Center. 2023 B-8

APPENDIX C DATA TABLES AND FIGURES

Intentionally left blank

Table C-1.1 Table C-1.2 Table C-1.3 CONCENTRATIONS OF GROSS BETA IN SURFACE WATER SAMPLES COLLECTED IN THE VICINITY OF BYRON CLEAN ENERGY CENTER, 2023 RES UL TS IN UNITS OF PC I/LITER+/- 2 SIGMA COLLECTION PERIOD 01/10/23 01/31/23 02/07/23 02/28/23 03/07/23 03/28/23 04/04/23 04/25/23 05/02/23 05/30/23 06/06/23 06/27/23 07/05/23 - 07/25/23 08/01/23 08/29/23 09/05/23 09/26/23 10/03/23 -

10/31/23 11/07/23 11 /28/23 12/05/23 -

12/26/23 MEAN+/- 2 STD DEV BY-12 4.9 +/- 1.8 4.8 +/- 2.2

< 3.3 4.6 +/- 2.2 5.6 +/- 2.0 3.5 +/- 2.2 4.7 +/- 2.3 3.9 +/- 2.2

< 3.7 4.7 +/- 2.1 6.7 +/- 2.5 9.2 +/- 3.3 5.2 +/- 3.3

< 3.1 BY-29 3.6 +/- 1.8 4.9 +/- 2.1 3.5 +/- 2.3 3.9 +/- 2.2 4.0 +/- 1.9 4.8 +/- 2.3 7.1 +/- 4.2 5.1 +/- 2.6 5.8 +/- 2.3 5.4 +/- 2.4 4.4 +/- 2.8 4.8 +/- 2.2 CONCENTRATIONS OF TRITIUM IN SURFACE WATER SAMPLES COLLECTED IN THE VICINITY OF BYRON CLEAN ENERGY CENTER, 2023 RES UL TS IN UNITS OF PC I/LITER+/- 2 SIGMA COLLECTION PERIOD 01/10/23 -

03/28/23 04/04/23 06/27 /23 07 /05/23 -

09/26/23 10/03/23 -

12/26/23 MEAN+/- 2 STD DEV BY-12 552 +/- 141

< 180 5960 +/- 664 973 +/- 177 2495 +/- 6016 BY-29

< 186

< 182

< 195

< 193 CONCENTRATIONS OF Nl-63 IN SURFACE WATER SAMPLES COLLECTED IN THE VICINITY OF BYRON CLEAN ENERGY CENTER, 2023 RESULTS IN UNITS OF PC I/LITER+/- 2 SIGMA COLLECTION PERIOD BY-12 BY-29 01/10/23 -

01/31/23

< 23

< 23 02/07/23 02/28/23

< 23

< 23 03/07/23 03/28/23

< 21

< 24 04/04/23 04/25/23

< 14

< 24 05/02/23 05/30/23

< 25

< 22 06/06/23 06/27/23

< 20

< 20 07/05/23 -

07/25/23

< 19

< 19 08/01/23 08/29/23

< 17

< 17 09/05/23 09/26/23

< 18

< 21 10/03/23 10/31/23

< 22

< 19 11/07/23 11 /28/23

< 19

< 19 12/05/23 12/26/23

< 22

< 21 MEAN THE MEAN AND TWO STANDARD DEV/AT/ON ARE CALCULATED USING THE POSITIVE VALUES C-1

Table C-1.4 CONCENTRATIONS OF GAMMA EMITTERS IN SURFACE WATER SAMPLES COLLECTED IN THE VICINITY OF BYRON CLEAN ENERGY CENTER, 2023 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION SITE PERIOD Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 1-131 Cs-134 Cs-137 Ba-140 La-140 BY-12 01/03/23 - 01/31/23

< 2

< 6

< 3

< 5

< 3

< 4

< 9

< 3

< 2

< 18

< 6 02/14/23 - 02/28/23

< 5

< 6

< -12

< 7

< 11

< 6

< 11

< 13

< 6

< 7

< 30

< 13 03/07/23 - 03/28/23

< 2

< 5

< 2

< 5

< 2

< 4

< 7

< 2

< 15

< 5 04/04/23 - 04/25/23

< 2

< 5

< 2

< 5

< 3

< 4

< 7

< 3

< 16

< 5 05/02/23 - 05/30/23

< 2

< 4

< 2

< 4

< 2

< 4

< 10

< 2

< 18

< 6 06/06/23 - 06/27/23

< 2

< 4

< 2

< 3

< 2

< 4

< 14

< 2

< 20

< 7 07/05/23 - 07/25/23

< 2

< 4

< 2

< 3

< 2

< 3

< 6

< 2

< 12

< 4 08/01/23 - 08/29/23

< 1

< 2

< 3

< 2

< 3

< 2

< 3

< 9

< 1

< 14

< 5 09/05/23 - 09/26/23

< 4

< 9

< 6

< 8

< 5

< 7

< 14

< 4

< 30

< 11 10/03/23 - 10/31/23

< 3

< 6

< 3

< 5

< 3

< 5

< 10

< 3

< 20

< 7 11/07/23 - 11/28/23

< 3

< 8

< 3

< 6

< 3

< 5

< 7

< 3

< 16

< 6 12/05/23 - 12/26/23

< 4

< 5

< 13

< 6

< 10

< 5

< 9

< 14

< 5

< 32

< 11 MEAN

(')

I I\\)

BY-29 01/10/23 - 01/31/23

< 6

< 15

< 7

< 13

< 5

< 10

< 13

< 6

< 4

< 30

< 9 02/07 /23 - 02/28/23

< 5

< 11

< 5

< 9

< 5

< 9

< 13

< 5

< 33

< 10 03/07/23 - 03/28/23

< 3

< 6

< 3

< 7

< 3

< 5

< 9

< 3

< 19

< 6 04/04/23 - 04/25/23

< 3

< 4

< 7

< 4

< 6

< 4

< 6

< 10

< 4

< 22

< 9 05/02/23 - 05/30/23

< 2

< 4

<2

< 4

< 2

< 3

< 9

< 2

< 18

< 7 06/06/23 - 06/27 /23

< 2

< 5

< 2

< 4

< 2

< 4

< 13

< 2

< 23

< 9 07 /05/23 - 07 /25/23

< 2

< 4

< 2

< 3

< 2

< 3

< 5

< 2

< 11

< 5 08/01 /23 - 08/29/23

< 2

< 4

< 2

< 3

< 2

< 3

< 11

< 2

< 17

< 6 09/05123 - 09126/23

< 4

< 5

< 10

< 5

< 10

< 5

< 10

< 13

< 4

< 29

< 9 10/03/23 - 10131 /23

< 2

< 6

< 3

< 5

< 2

< 5

< 9

< 3

< 2

< 18

< 7 11107/23 - 11/28123

< 2

< 5

< 2

< 5

< 3

< 5

< 7

< 2

< 3

< 16

< 5 12/05123 - 12126/23

< 5

< 13

< 7

< 10

< 5

< 8

< 14

< 6

< 35

< 14 MEAN

Table C-11.1 CONCENTRATIONS OF TRITIUM IN GROUND WATER SAMPLES COLLECTED IN THE VICINITY OF BYRON CLEAN ENERGY CENTER, 2023 RESULTS IN UNITS OF PC I/LITER+/- 2 SIGMA COLLECTION PERIOD BY-14-1 BY-18-1 BY-32 BY-35 BY-37 BY-38 02/11/23 - 02/11/23

< 184

< 183

< 178

< 184

< 192 02/14/23 - 02/14/23

< 175 04/11/23 - 04/11/23

< 194

< 193

< 185

< 183

< 185

< 187 07/11/23 - 07/11/23

< 196

< 195

< 197

< 194 10/10/23 10/10/23

< 183

< 174

< 176

< 172

< 177 MEAN C-3

Table C-11.2 CONCENTRATIONS OF GAMMA EMITTERS IN GROUND WATER SAMPLES COLLECTED IN THE VICINITY OF BYRON CLEAN ENERGY CENTER, 2023 RES UL TS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION SITE PERIOD Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 1-131 Cs-134 Cs-137 Ba-140 La-140 BY-14-1 02/14/23 - 02/14/23

< 7

< 6

< 14

< 9

< 16

< 7

< 12

< 6

<8

< 7

< 24

< 6 04/11/23 - 04/11/23

< 6

< 10

< 8

< 15

< 7

< 10

< 13

<7

< 7

< 28

< 15 07/11/23 - 07/11 /23

< 5

< 8

< 12

< 6

< 12

< 8

< 12

< 10

<7

< 7

< 28

< 5 10/10/23 - 10/10/23

< 6

< 7

< 17

< 7

< 20

< 8

< 11

< 9

< 7

< 26

< 13 MEAN BY-18-1 02/11/23 - 02/11/23

< 7

< 8

< 14

< 8

< 16

< 9

< 13

< 10

<9

< 7

< 41

< 9 04/11/23 - 04/11/23

< 8

< 5

< 11

< 8

< 12

< 6

< 11

< 10

< 5

< 8

< 34

< 13 07/11/23 - 07/11/23

< 7

< 6

< 14

< 8

< 10

< 9

< 12

< 10

< 4

< 34

< 8 10/10/23 - 10/10/23

< 7

< 16

< 8

< 14

< 9

< 12

< 11

< 8

< 7

< 29

< 8 MEAN BY-32 02/11 /23 - 02/11 /23

< 8

< 13

< 9

< 19

< 10

< 13

< 10

<9

< 8

< 31

< 10 04/11/23 - 04/11/23

< 8

< 5

< 18

< 8

< 13

< 8

< 14

< 13

<7

< 6

< 30

< 12

(')

07/11/23 - 07/11/23

< 4

< 7

< 6

< 10

< 5

< 7

< 6

<4

< 5

< :22

< 7

.I:,.

10/10/23 - 10/10/23

< 8

< 13

< 10

< 21

< 10

< 15

< 10

<7

< 8

< :27

< 13 MEAN BY-35 02/11/23 - 02/11 /23

< 7

< 9

< 6

< 14

< 7

< 10

< 7

<4

< 6

< 18

< 7 04/11/23 - 04/11/23

< 6

< 7

< 14

< 8

< 15

< 8

< 12

< 14

< 9

< 8

< 33

< 10 07/11/23 - 07/11/23

< 4

< 5

< 12

< 5

< 9

< 5

< 9

< 5

<6

< 5

< 21

< 8 10/10/23 - 10/10/23

< 7

<7

< 16

< 8

< 17

< 8

< 13

< 9

< 8

< 30

< 8 MEAN BY-37 02/11 /23 - 02/11 /23

< 6

< 8

< 12

< 9

< 14

< 5

< 13

< 8

<7

< 5

< 25

< 8 04/11/23 - 04/11/23

< 6

< 7

< 15

< 7

< 12

< 7

< 13

< 12

<4

< 7

< '.11

< 14 07/11/23 - 07/11/23

< 5

< 4

< 8

< 6

< 7

< 5

< 12

< 7

< 5

< 16

< 7 10/10/23 - 10/10/23

< 7

< 16

< 7

< 19

< 9

< 15

< 11

<9

< 9

< 35

< 11 MEAN BY-38 02/11/23 - 02/11 /23

< 5

< 6

< 23

< 8

< 17

< 7

< 13

< 8

< 10

< 8

< 29

< 12 04/11/23 - 04/11/23

< 6

< 8

< 11

< 7

< 14

< 7

< 12

< 13

<6

< 5

< 29

< 13 07/11/23 - 07/11123

< 6

< 8

< 13

< 6

< 14

< 6

< 10

< 8

<7

< 5

< 33

< 8 10/10/23 - 10/10/23

< 6

< 7

< 15

< 9

< 13

< 7

< 12

< 9

< 8

< 7

< 27

< 11 MEAN

Table C-111.1 CONCENTRATIONS OF NICKEL-63 AND GAMMA EMITTERS IN FISH SAMPLES COLLECTED IN THE VICINITY OF BYRON CLEAN ENERGY CENTER, 2023 RES UL TS IN UNITS OF PCI/KG WET+/- 2 SIGMA COLLECTION SITE PERIOD Ni-63 Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 Cs-134 Cs-137 Ba-140 La-140 BY-29 Freshwater Drum 05/23/23 - 05/23/23

< 250

< 53

< 66

< 133

< 69

< 140

< 68

< 129

< 48

< 61

< 408

< 165 Golden Redhorse 05/23/23 - 05/23/23

< 235

< 45

< 56

< 145

< 49

< 126

< 52

< 87

< 63

< 62

< 462

< 122 Shorthead Redhorse 10/10/23 - 10/10/23

< 173

< 61

< 59

< 183

< 74

< 179

< 63

< 133

< 84

< 69

< 341

< 144 Golden Redhorse 10/10/23 - 10/10/23

< 156

< 54

< 53

< 94

< 78

< 141

< 52

< 82

< 56

< 54

< 310

< 129 MEAN BY-31 Freshwater Drum 05/23/23 - 05/23/23

< 169

< 65

< 66

< 106

< 66

< 146

< 55

< 133

< 74

< 42

< 674

< 162

(")

Golden Redhorse 05/23/23 - 05/23/23

< 171

< 85

< 74

< 175

< 71

< 176

< 80

< 165

< 72

< 78

< 672

< 186 I

c.n Freshwater Drum 10/10/23 - 10/10/23

< 164

< 66

< 54

< 126

< 45

< 111

< 52

< 95

< 58

< 48

< 230

< 72 Golden Redhorse 10/10/23 10/10/23

< 202

< 74

< 70

< 181

< 75

< 174

< 81

< 139

< 86

< 362

< 147 MEAN

()

O')

Table C-IV.1 COLLECTION SITE PERIOD BY -12 05/09/23 - 05/09/23 10/10/23 - 10/10/23 MEAN BY-34 05/09/23 - 05/09/23 10/10/23 10/10/23 MEAN CONCENTRATIONS OF NICKEL-63 AND GAMMA EMITTERS IN SEDIMENT SAMPLES COLLECTED IN THE VICINITY OF BYRON CLEAN ENERGY CENTER, 2023 Ni-63

< 209

< 255

< 151

< 133 Mn-54

< 101

< 98

< 40

< 83 Co-58

< 94

< 108

< 53

< 104 RES UL TS IN UNITS OF PCI/KG DRY+/- 2 SIGMA Fe-59

< 194

< 221

< 102

< 215 Co-60 Zn-65

< 88

< 168

< 100

< 41

< 104

< 235

< 102

< 222 Nb-95

< 102

< 114

< 44

< 111 Zr-95

< 168

< 177

< 90

< 151 Cs-134

< 109

< 127

< 67

< 124 Cs-137

< 142

< 114

< 58

< 131 Ba-140

< 413

< 424

< 220

< 366 La-140

< 92

< 138

< 94

< 172

Table C-V.1 CONCENTRATIONS OF GROSS BETA IN AIR PARTICULATE SAMPLES COLLECTED IN THE VICINITY OF BYRON CLEAN ENERGY CENTER, 2023 RES UL TS IN UNITS OF E-3 PCI/CU METER+/- 2 SIGMA COLLECTION PERIOD 12/27/22 - 01 /03/23 01/03/23 - 01/10/23 01/10/23 - 01/17/23 01/17/23 - 01/24/23 01/24/23 - 01/31/23 01/31/23 - 02/07/23 02/07/23 - 02/14/23 02/14/23 - 02/21 /23 02/21/23 - 02/28/23 02/28/23 - 03/07/23 03/07/23 - 03/14/23 03/14/23 - 03/21 /23 03/21 /23 - 03/28/23 03/28/23 - 04/04/23 04/04/23 - 04/11/23 04/11/23 - 04/18/23 04/18/23 - 04/25/23 04/25/23 - 05/02/23 05/02/23 - 05/09/23 05/09/23 - 05/16/23 05/16/23 - 05/23/23 05/23/23 - 05/30/23 05/30/23 - 06/06/23 06/06/23 - 06/13/23 06/13/23 - 06/20/23 06/20/23 - 06/27/23 06/27 /23 - 07 /05/23 07/05/23 - 07/11/23 07/11/23 - 07/18/23 07/18/23 - 07/25/23 07/25/23 - 08/01/23 08/01 /23 - 08/08/23 08/08/23 - 08/15/23 08/15/23 - 08/22/23 08/22/23 - 08/29/23 08/29/23 - 09/05/23 09/05/23 - 09/12/23 09/12/23 - 09/19/23 09/19/23 - 09/26/23 09/26/23 - 10/03/23 10/03/23 - 10/10/23 10/10/23 - 10/17/23 10/17/23 - 10/24/23 10/24/23 - 10/31 /23 10/31/23 - 11/07/23 11/07/23 - 11/14/23 11/14/23 11/21/23 11/21/23 - 11/28/23 11/28/23 - 12/05/23 12/05/23 - 12/12/23 12/12/23 - 12/19/23 12/19/23 - 12/26/23 12/26/23 - 01/02/24 MEAN+/- 2 STD DEV BY-21 29 +/- 5 23 +/- 5 31 +/- 5 18 +/- 4 24 +/- 5 27 +/- 5 17 +/- 4 18 +/- 4 16 +/- 4 15 +/- 4 14 +/- 4 20 +/- 5 10 +/- 4 22 +/- 4 25 +/- 5 16 +/- 4 11 +/- 4 9 +/- 3 13 +/- 4 18 +/- 4 15 +/- 4 21 +/- 4 23 +/- 5 15 +/- 4 16 +/- 4 21 +/- 4 25 +/- 4 20 +/- 5 14 +/- 4 20 +/- 4 21 +/- 4 26 +/- 4 19 +/- 4 15 +/- 4 33 +/- 5 18 +/- 4 14 +/- 4 18 +/- 4 33 +/- 5 33 +/- 5 17 +/- 5 14 +/- 4 24 +/- 5 22 +/- 5 35 +/- 5 22 +/- 4 20 +/- 4 21 +/- 4 21 +/- 4 27 +/- 5 15 +/- 4 23 +/- 5 14 +/- 4 20 +/- 12 GROUP I BY-22 36 +/- 5 23 +/- 4 35 +/- 5 22 +/- 4 25 +/- 4 26 +/- 5 13 +/- 4 19 +/- 4 13 +/- 4 14 +/- 4 13 +/- 4 23 +/- 5 23 +/- 5 22 +/- 4 24 +/- 5 14 +/- 4 11 +/- 4 12 +/- 4 15 +/- 4 21 +/- 4 18 +/- 4 20 +/- 4 23 +/- 5

< 6 (1)

(1) 30 +/- 4 20 +/- 5 17 +/- 4 18 +/- 4 19 +/- 4 19 +/- 4 17 +/- 4 17 +/- 4 33 +/- 5 22 +/- 4 13 +/- 4 17 +/- 4 37 +/- 5 30 +/- 5 18 +/- 5 20 +/- 5 25 +/- 5 21 +/- 5 35 +/- 5 18 +/- 4 19 +/- 4 19 +/- 4 23 +/- 4 27 +/- 5 22 +/- 5 21 +/- 4 15 +/- 4 21 +/- 13 BY-23 31 +/- 5 35 +/- 5 32 +/- 5 17 +/- 4 23 +/- 4 29 +/- 5 12 +/- 4 23 +/- 4 18 +/- 4 14 +/- 4 14 +/- 4 22 +/- 5 25 +/- 5 18 +/- 4 23 +/- 5 14 +/- 4 8 +/- 3 11 +/- 4 15 +/- 4 19 +/- 4 16 +/- 4 21 +/- 4 24 +/- 5 15 +/- 4 15 +/- 4 19 +/- 4 28 +/- 4 24 +/- 5 16 +/- 4 16 +/- 4 21 +/- 4 24 +/- 4 18 +/- 4 16 +/- 4 29 +/- 5 20 +/- 4 14 +/- 4 19 +/- 4 36 +/- 5 10 +/- 4 20 +/- 5 16 +/- 4 24 +/- 5 17 +/- 4 30 +/- 5 17 +/- 4 21 +/- 4 24 +/- 4 26 +/- 5 27 +/- 5 26 +/- 5 25 +/- 5 11 +/- 4 20 +/- 13 BY-24 33 +/- 5 28 +/- 5 35 +/- 6 14 +/- 4 25 +/- 5 28 +/- 5 13 +/- 4 18 +/- 4 16 +/- 4 17 +/- 4 13 +/- 4 21 +/- 5 24 +/- 5 23 +/- 4 21 +/- 4 15 +/- 4 13 +/- 4 11 +/- 3 13 +/- 4 18 +/- 4 18 +/- 4 23 +/- 4 26 +/- 5 12 +/- 4 15 +/- 4 23 +/- 4 24 +/- 4 23 +/- 5 11 +/- 4 21 +/- 4 18 +/- 4 21 +/- 4 21 +/- 4 22 +/- 5 35 +/- 5 19 +/- 4 13 +/- 4 16 +/- 4 36 +/- 5 28 +/- 5 17 +/- 5 17 +/- 4 24 +/- 5 23 +/- 5 36 +/- 5 21 +/- 4 20 +/- 4 21 +/- 4 20 +/- 4 21 +/- 4 23 +/- 5 22 +/- 4 15 +/- 4 21 +/- 13 BY-01 31 +/- 5 26 +/- 5 31 +/- 5 16 +/- 4 23 +/- 5 33 +/- 5 13 +/- 4 19 +/- 4 16 +/- 4 20 +/- 4 13 +/- 4 23 +/- 5 21 +/- 5 20 +/- 4 22 +/- 5 16 +/- 4 16 +/- 4 12 +/- 4 18 +/- 4 18 +/- 4 16 +/- 4 16 +/- 4 24 +/- 5 13 +/- 4 20 +/- 4 25 +/- 4 28 +/- 4 22 +/- 5 13 +/- 4 18 +/- 4 18 +/- 4 27 +/- 4 21 +/- 4 14 +/- 4 34 +/- 5 23 +/- 4 17 +/- 4 19 +/- 4 30 +/- 5 28 +/- 5 15 +/- 4 18 +/- 4 25 +/- 5 23 +/- 5 35 +/- 5 18 +/- 4 21 +/- 4 21 +/- 4 21 +/- 4 24 +/- 5 26 +/- 5 25 +/- 5 13 +/- 4 21 +/- 12 GROUP II BY-04 27 +/- 5 25 +/- 5 29 +/- 5 18 +/- 4 30 +/- 6 25 +/- 5 19 +/- 5 19 +/- 4 16 +/- 4 17 +/- 4 11 +/- 4 23 +/- 5 21 +/- 5 24 +/- 5 23 +/- 5 10 +/- 4 12 +/- 4 12 +/- 4 17 +/- 4 17 +/- 4 15 +/- 4 15 +/- 4 20 +/- 4 12 +/- 4 14 +/- 4 17 +/- 4 22 +/- 4 20 +/- 5 12 +/- 4 19 +/- 4 17 +/- 4 23 +/- 4 19 +/- 4 15 +/- 4 35 +/- 5 17 +/- 4 14 +/- 4 16 +/- 4 28 +/- 5 30 +/- 5 18 +/- 5 11 +/- 4 26 +/- 5 17 +/- 4 36 +/- 5 15 +/- 4 20 +/- 4 16 +/- 4 21 +/- 4 22 +/- 4 23 +/- 5 30 +/- 5 14 +/- 4 20 +/- 12 BY-06 30 +/- 5 33 +/- 5 28 +/- 5 17 +/- 4 23 +/- 4 14 +/- 4 18 +/- 5 18 +/- 4 16 +/- 4 13 +/- 4 13 +/- 4 18 +/- 5 22 +/- 5 18 +/- 4 25 +/- 5 14 +/- 4 12 +/- 4 15 +/- 4 28 +/- 7 22 +/- 4 16 +/- 4 22 +/- 4 21 +/- 4 13 +/- 4 16 +/- 4 21 +/- 4 27 +/- 4 27 +/- 5 13 +/- 4 19 +/- 4 22 +/- 4 25 +/- 4 19 +/- 4 14 +/- 4 34 +/- 5 22 +/- 4 13 +/- 4 18 +/- 4 33 +/- 5 29 +/- 5 20 +/- 5 24 +/- 5 28 +/- 5 24 +/- 5 29 +/- 5 16 +/- 4 18 +/- 4 18 +/- 4 20 +/- 4 23 +/- 4 20 +/- 5 24 +/- 5 18 +/- 4 21 +/- 11 THE MEAN AND TWO STANDARD DEVIATION ARE CALCULATED USING THE POSITIVE VALUES (1) SEE PROGRAM EXCEPTIONS SECTION FOR EXPLANA T/ON C-7 GROUP Ill BY-08 34 +/- 5 31 +/- 5 37 +/- 6 18 +/- 4 28 +/- 5 30 +/- 5 20 +/- 5 17 +/- 4 10 +/- 4 20 +/- 4 12 +/- 4 22 +/- 5 26 +/- 5 24 +/- 5 20 +/- 4 15 +/- 4 10 +/- 4 13 +/- 4 20 +/- 4 21 +/- 4 19 +/- 4 23 +/- 4 25 +/- 5 13 +/- 4 20 +/- 4 24 +/- 4 25 +/- 4 16 +/- 4 16 +/- 4 21 +/- 4 22 +/- 4 23 +/- 4 24 +/- 4 19 +/- 4 38 +/- 5 19 +/- 4 17 +/- 4 23 +/- 5 38 +/- 5 29 +/- 5 18 +/- 5 16 +/- 4 26 +/- 5 20 +/- 5 42 +/- 6 19 +/- 4 19 +/- 4 18 +/- 4 23 +/- 4 21 +/- 4 8 +/- 4 21 +/- 4 12 +/- 4 22 +/- 15

Table C-V.2 MONTHLY AND YEARLY MEAN VALUES OF GROSS BETA CONCENTRATIONS IN AIR PARTICULATE SAMPLES COLLECTED IN THE VICINITY OF BYRON CLEAN ENERGY CENTER, 2023 RES UL TS IN UNITS OF E-3 PCI/CU METER+/- 2 SIGMA GROUP I - NEARSITE LOCATIONS GROUP II - FAR FIELD LOCATIONS GROUP Ill CONTROL LOCATIONS COLLECTION MIN MAX MEAN COLLECTION MIN MAX MEAN COLLECTION Mlt\\'

MAX MEAN PERIOD

+/- 2SD PERIOD

+/-2SD 12/27/22 - 01/31/23 14 36 27 +/- 13 12/27/22 01/31/23 16 33 26 +/- 11 12/27/22 - 01/31/23 18 37 30 +/- 14 01/31/23 - 02/28/23 12 29 19 +/- 11 01 /31 /23 - 02/28/23 13 33 19 +/- 11 01/31/23 02/28/23 10 30 19 +/- 17 02/28/23 - 03/28/23 10 25 18 +/- 10 02/28/23 03/28/23 11 23 18 +/- 9 02/28/23 - 03128/23 12 26 20 +/- 12 03/28/23 - 05/02123 8

25 16 +/- 11 03128123 05102123 10 25 17 +/- 10 03128/23 05/02/23 10 24 16 +/- 11 05102/23 - 05/30/23 13 23 18 +/- 6 05102/23 05130/23 15 28 18 +/- 8 05102123 - 05/30/23 19 23 20 +/- 4 05/30/23 06/27/23 12 26 19 +/- 9 05/30/23 06/27/23 12 25 18 +/- 9 05130/23 - 06/27/23 13 25 21 +/- 11 06/27/23 - 08/01/23 11 30 20 +/- 9 06/27/23 - 08101/23 12 28 20 +/- 10 06/27123 08/01/23 16 25 20 +/- 8 08/01/23 - 08129/23 15 35 23 +/- 13 08/01123 08/29/23 14 35 23 +/- 15 08101 /23 - 08129/23 19 38 26 +/- 16 08/29123 10/03/23 10 37 22 +/- 18 08/29/23 10/03123 13 33 22 +/- 14 08/29123 10/03/23 17 38 26 +/- 17 10/03123 - 10/31/23 14 25 20 +/- 7 10/03/23 10/31/23 11 28 21 +/- 10 10/03/23 - 10/31/23 16 26 20 +/- 9

()

10131123 - 11128/23 17 36 24 +/- 13 10/31/23 11/28/23 15 36 22 +/- 15 10/31/23 11 /28/23 18 42 25 +/- 24 I

11/28/23 - 01/02124 11 27 21 +/- 10 11 /28/23 01/02/24 13 30 22 +/- 9 11/28/23 - 01/02/24 8

23 17 +/- 13 CX) 12/27/22 - 01/02/24 8

37 21 +/- 13 12/27/22 01/02/24 10 36 20 +/- 12 12/27/22 - 01/02124 8

42 22 +/- 15

Table C-V.3 CONCENTRATIONS OF GAMMA EMITTERS IN AIR PARTICULATE SAMPLES COLLECTED IN THE VICINITY OF BYRON CLEAN ENERGY CENTER, 2023:

RES UL TS IN UNITS OF E-3 PCI/CU METER+/- 2 SIGMA COLLECTION SITE PERIOD Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 Cs-134 Cs-137 Ba-140 La-140 BY-01 12/27/22 - 03/28/23

< 3

< 5

< 14

< 4

< 10

< 4

< 11

< 3

< 230

< 80 03/28/23 - 06/27/23

< 4

< 5

< 15

< 3

< 9

< 5

< 9

< 3

< 240

< 97 06/27/23 - 10/03/23

< 2

< 3

< 11

< 3

< 6

< 4

< 5

< 2

< 98

< 59 10/03/23 - 01 /02/24

< 3

< 4

< 12

< 2

< 6

< 3

< 6

< 3

< 139

< 46 MEAN BY-04 12/27/22 - 03/28/23

< 3

< 4

< 12

< 3

< 5

< 3

< 6

< 2

< 144

< 82 03/28/23 - 06/27/23

< 3

< 5

< 17

< 3

< 9

< 7

< 9

< 4

< 3

< 263

< 117 06/27/23 - 10/03/23

< 2

< 3

< 8

< 2

< 7

< 3

< 5

< 2

< 129

< 65 10/03/23 - 01 /02/24

< 2

< 3

< 7

< 3

< 5

< 2

< 5

< 2

< 93

< 44

(')

MEAN I

(!:)

BY-06 12/27/22 - 03/28/23

< 2

< 3

< 10

< 2

< 5

< 4

< 6

< 2

< 163

< 71 03/28/23 - 06/27/23

< 3

< 5

< 15

< 4

< 12

< 6

< 10

< 4

< 3

< 238

< 61 06/27/23 10/03/23

< 2

< 3

< 8

< 2

< 5

< 3

< 5

< 2

< 118

< 31 10/03/23 - 01 /02/24

< 2

< 8

< 3

< 6

< 3

< 7

< 3

< 2

< 119

< 50 MEAN BY-08 12/27/22 - 03/28/23

< 2

< 3

< 6

< 2

< 4

< 3

< 5

< 2

< 128

< 78 03/28/23 - 06/27/23

< 2

< 7

< 2

< 5

< 3

< 6

< 2

< 175

< 49 06/27/23 - 10/03/23

< 2

< 3

< 10

< 1

< 5

< 3

< 6

< 2

< 147

< 55 10/03/23 01 /02/24

< 3

< 12

< 3

< 7

< 5

< 9

< 3

< 140

< 50 MEAN

Table C-V.3 CONCENTRATIONS OF GAMMA EMITTERS IN AIR PARTICULATE SAMPLES COLLECTED IN THE VICINITY OF BYRON CLEAN ENERGY CENTER, 202~1 RESULTS IN UNITS OF E-3 PCI/CU METER+/- 2 SIGMA COLLECTION SITE PERIOD Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 Cs-134 Cs-137 Ba-140 La-140 BY-21 12/27/22 - 03/28/23

< 3

< 5

< 15

< 3

< 8

< 4

< 7

< 3

< 254

< 69 03/28/23 - 06/27/23

< 3

< 13

< 3

< 7

< 4

< 7

< 3

< 225

< 93 06/27/23 - 10/03/23

< 2

< 9

< 2

< 4

< 3

< 2

< 1

< 109

< 51 10/03/23 - 01 /02/24

< 3

< 6

< 17

< 4

< 8

< 6

< 10

< 4

< 3

< 205

< 88 MEAN BY-22 12/27 /22 -

03/28/23

< 3

< 5

< 16

< 2

< 6

< 7

< 4

< 3

< 239

< 90 03/28/23 - 06/27/23

< 3

< 5

< 21

< 5

< 11

< 6

< 12

< 5

< 3

< 338

< 141 06/27/23 - 10/03/23

< 2

< 3

< 7

< 3

< 5

< 3

< 6

< 2

< 144

< 67 10/03/23 01/02/24

< 2

< 4

< 14

< 3

< 8

< 4

< 7

< 3

< 2

< 108

< 46

~

MEAN 0

BY-23 12/27/22 03/28/23

< 3

< 4

< 16

< 3

< 8

< 4

< 9

< 3

< 228

< 98 03/28/23 - 06/27/23

< 2

< 3

< 8

< 2

< 5

< 3

< 5

< 2

< 182

< 64 06/27/23 - 10/03/23

< 2

< 3

< 9

< 2

< 6

< 3

< 6

< 1

< 2

< 127

< 44 10/03/23 - 01 /02/24

< 2

< 3

< 10

< 2

< 5

< 3

< 6

< 2

< 95

< 46 MEAN BY-24 12/27/22 - 03/28/23

< 3

< 10

< 2

< 6

< 3

< 5

< 3

< 2

< 150

< 80 03/28/23 - 06/27/23

< 3

< 5

< 15

< 3

< 8

< 4

< 9

< 3

< 287

< 60 06/27/23 -

10/03/23

< 2

< 1

< 8

< 2

< 5

< 4

< 5

< 2

< 134

< 38 10/03/23 01 /02/24

< 2

< 4

< 10

< 2

< 5

< 3

< 6

< 1

< 2

< 83

< 39 MEAN

Table C-Vl.1 CONCENTRATIONS OF 1-131 IN AIR IODINE SAMPLES COLLECTED IN THE VICINITY OF BYRON CLEAN ENERGY CENTER, 2023 RESULTS IN UNITS OF E-3 PCI/CU METER+/- 2 SIGMA COLLECTION GROUP I GROUP 11 GROUP Ill PERIOD BY-21 BY-22 BY-23 BY-24 BY-01 BY-04 BY-06 BY-08 12/27/22 - 01 /03/23

< 50

< 48

< 49

< 51

< 57

< 56

< 54

< 60 01103/23 - 01/10/23

< 41

< 36

< 38

< 39

< 44

< 41

< 42 01/10/23 - 01/17/23

< 57

< 56

< 59

< 48

< 47

< 45

< 48 01/17/23 - 01/24/23

< 24

< 26

< 51

< 50

< 50 ca

--. VI 01/24/23 - 01/31/23

< 33

< 21

< 33

< 34

< 44

< 24

< 43

< 43 01/31/23 - 02/07/23

< 60

< 61

< 29

< 66

< 27

< 67

< 68 02/07/23 - 02114/23

< 36

< 35

< 34

< 31

< 32

< 31 02/14/23 - 02/21/23

< 47

< 46

< 47

< 38

< 37 02/21 /23 - 02/28/23

< 36

< 35

< 36

< 37

< 41

< 40

< 39 02/28/23 03/07/23

< 43

< 42

< 44

< 33

< 34

< 33

< 34 03/07/23 - 03/14/23

< 45

< 44

< 43

< 45

< 46

< 22

< 46 03/14/23 - 03/21 /23

< 34

< 35

< 54

< 58

< 58 03/21 /23 - 03/28/23

< 36

< 17

< 44

< 45 03/28/23 - 04/04/23

< 48

< 47

< 46

< 47

< 61

< 62

< 61

< 64 04/04/23 - 04/11/23

< 62

< 63

< 61

< 26

< 66

< 67

< 68 04/11/23 - 04/18/23

< 33

< 17

< 38

< 30

< 30 04/18/23 - 04/25/23

< 38

< 44

< 44 04/25/23 - 05/02/23

< 50

< 51

< 61

< 26

< 61 05/02/23 - 05/09/23

< 31

< 13

< 59

< 60

< 42

< 60 05/09/23 - 05/16/23

< 65

< 66

< 67 05/16/23 - 05/23/23

< 41

< 28

< 44

< 44 05/23/23 - 05/30/23

< 27

< 65

< 50

< 50 05/30/23 - 06/06/23

< 54

< 55

< 60

< 40 06/06/23 - 06/13/23

< 51

< 65

< 51

< 34

< 58

< 28

< 59 06/13/23 - 06/20/23

< 38 (1)

< 38

< 20

< 22

< 18

< 38 06/20/23 - 06/27/23

< 50 (1)

< 21

< 50

< 55

< 56

< 56 06/27/23 - 07/05/23

< 46

< 48

< 48 07/05/23 - 07/11/23

< 35

< 33

< 33 07/11/23 - 07/18/23

< 33

< 41

< 41 07/18/23 - 07/25/23

< 61

< 39

< 40

< 40 07/25/23 - 08/01/23

< 61

< 61 08/01/23 - 08/08/23

< 31

< 29

< 31

< 15

< 31 08/08/23 - 08/15/23

< 40

< 59

< 59 08/15/23 - 08/22/23

< 64

< 65

< 66

< 66 08/22/23 - 08/29/23

< 50

< 69

< 69 08/29/23 - 09/05/23

< 45

< 23

< 46

< 46 09/05/23 - 09/12/23

< 44

< 61

< 61 09/12/23 - 09/19/23

< 52

< 54

< 55 09/19/23 - 09/26/23

< 51

< 57

< 57 09/26/23 10/03/23

< 32

< 21

< 32

< 35

< 35 10/03/23 10/10/23

< 50

< 42

< 20 10/10/23 10/17/23

< 41

< 62

< 62 10/17/23 10/24/23

< 49

< 52

< 49

< 57

< 58

< 58 10/24/23 10/31/23

< 27

< 27 10/31/23 11/07/23

< 58

< 25

< 38

< 38 11/07/23 - 11/14/23

< 50

< 51

< 49

< 49 11/14/23 - 11/21/23

< 54

< 67

< 67 11 /21 /23 - 11 /28/23

< 67

< 59

< 60

< 60 11 /28/23 - 12/05/23

< 62

< 43

< 28

< 43

< 43 12/05/23 - 12/12/23

< 31

< 44

< 44 12/12/23 - 12/19/23

< 68

< 32

< 68

< 65

< 66

< 66 12/19/23 - 12/26/23

< 42

< 43

< 42

< 41

< 41 12/26/23 - 01/02/24

< 38

< 49

< 50

< 50 MEAN

( 1) SEE PROGRAM EXCEPTIONS SECTION FOR EX PLANA T!ON C-11

Table C-Vll.1 CONCENTRATIONS OF 1-131 IN MILK SAMPLES COLLECTED IN THE VICINITY OF BYRON CLEAN ENERGY CENTER, 2023 RES UL TS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION CONTROL FARM INDICATOR FARM PERIOD BY-26-2 BY-20-1 01/03/23

< 0.9

< 0.9 02/07/23

< 0.8

< 0.9 03/07/23

< 0.8

< 0.8 04/04/23

< 0.7 04/25/23

< 0.8 05/02/23

< 0.7

< 0.9 05/16/23

< 1.0

< 0.8 05/30/23

< 0.8

< 0.7 06/13/23

< 0.9

< 0.6 06/27/23

< 0.9

< 1.0 07/11/23

< 0.8

< 0.8 07/25/23

< 0.8

< 0.8 08/08/23

< 0.8

< 0.8 08/22/23

< 0.9

< 0.9 09/05/23

< 0.9

< 0.7 09/19/23

< 0.9

< 0.9 10/03/23

< 0.9

< 0.8 10/17/23

< 0.7

< 0.7 11/07/23

< 0.9

< 0.7 12/05/23

< 0.9

< 0.9 MEAN C-12

Table C-Vll.2 CONCENTRATIONS OF GAMMA EMMITTERS IN MILK SAMPLES COLLECTED IN THE VICINITY OF BYRON CLEAN ENERGY CENTER, 2023 RES UL TS IN UNITS OF PC I/LITER+/- 2 SIGMA COLLECTION SITE PERIOD Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 Cs-134 Cs-137 Ba-140 La-140 BY-20-1 01/03/23

< 8

< 7

< 20

< 9

< 21

< 7

< 15

< 9

< 8

< 36

< 11 02/07/23

< 8

< 9

< 23

< 7

< 16

< 9

< 15

< 9

< 8

< 42

< 12 03/07/23

< 7

< 16

< 9

< 17

< 7

< 13

< 9

< 8

< 27

< 7 04/25/23

< 8

< 19

< 10

< 21

< 8

< 14

< 9

< 8

< 31

< 9 05/02/23

< 8

< 9

< 20

< 10

< 19

< 7

< 16

< 8

< 7

< 30

< 9 05/16/23

< 8

< 21

< 10

< 19

< 7

< 14

< 8

< 9

< 37

< 9 05/30/23

< 6

< 7

< 15

< 10

< 20

< 7

< 11

< 8

< 7

< 34

< 9 06/13/23

< 8

< 6

< 17

< 9

< 18

< 7

< 14

< 8

< 6

< 30

< 12 06/27/23

< 6

< 8

< 18

< 9

< 18

< 8

< 14

< 9

< 34

< 7 07/11/23

< 9

< 6

< 19

< 9

< 16

< 8

< 13

< 7

< 8

< 29

< 11 07/25/23

< 8

< 9

< 17

< 7

< 19

< 8

< 16

< 8

< 37

< 9 08/08/23

< 6

< 15

< 9

< 17

< 6

< 12

< 7

< 6

< 26

< 8 08/22/23

< 8

< 7

< 20

< 9

< 15

< 9

< 13

< 8

< 44

< 12 09/05/23

< 8

< 7

< 16

< 6

< 18

< 7

< 13

< 8

< 9

< 29

< 10 09/19/23

< 8

< 16

< 10

< 18

< 8

< 12

< 9

< 8

< 29

< 8 10/03/23

< 5

< 14

< 7

< 17

< 5

< 9

< 6

< 5

< 29

< 9

(")

10/17/23

< 8

< 19

< 9

< 18

< 8

< 13

< 10

< 8

< 34

< 8 I

11/07/23

< 15

< 8

< 7

< 9

< 16

< 8

< 13

< 9

< 7

< 37

< 10 w

12/05/23

< 7

< 9

< 18

< 10

< 15

< 10

< 14

< 10

< 28

< 8 MEAN BY-26-2 01/03/23

< 7

< 10

< 22

< 10

< 17

< 8

< 16

< 9

< 8

< 34

< 11 02/07/23

< 7

< 8

< 16

< 8

< 17

< 7

< 15

< 9

< 7

< 34

< 11 03/07/23

< 8

< 7

< 17

< 7

< 17

< 8

< 13

< 9

< 6

< 28

< 9 04/04/23

< 4

< 5

< 12

< 7

< 13

< 5

< 8

< 6

< 5

< 19

< 6 05/02/23

< 6

< 8

< 21

< 9

< 17

< 9

< 14

< 9

< 36

< 12 05/16/23

< 8

< 17

< 7

< 18

< 6

< 11

< 9

< 7

< 25

< 10 05/30/23

< 9

< 7

< 20

< 10

< 22

< 8

< 15

< 7

< 8

< 38

< 14 06/13/23

< 7

< 9

< 18

< 10

< 16

< 8

< 16

< 9

< 8

< 35

< 9 06/27/23

< 7

< 6

< 18

< 11

< 23

< 8

< 15

< 8

< 9

< 24

< 6 07/11/23

< 9

< 8

< 17

< 8

< 18

< 6

< 15

< 9

< 8

< 25

< 11 07/25/23

< 8

< 18

< 8

< 15

< 7

< 14

< 9

< 8

< 44

< 9 08/08/23

< 8

< 17

< 11

< 21

< 10

< 11

< 9

< 6

< 28

< 4 08/22/23

< 7

< 20

< 10

< 21

< 7

< 12

< 10

< 34

< 9 09/05/23

< 9

< 10

< 22

< 7

< 23

< 9

< 18

< 9

< 37

< 10 09/19/23

< 7

< 19

< 8

< 18

< 9

< 10

< 9

< 31

< 10 10/03/23

< 6

< 8

< 17

< 6

< 17

< 7

< 13

< 7

< 29

< 10 10/17/23

< 9

< 19

< 9

< 19

< 8

< 14

< 9

< 29

< 8 11/07/23

< 8

< 9

< 18

< 11

< 19

< 9

< 11

< 8

< 40

< 10 12/05/23

< 9

< 7

< 17

< 9

< 18

< 9

< 14

< 8

< 9

< 36

< 10 MEAN

Table C-Vlll.1 CONCENTRATIONS OF GAMMA EMITTERS IN VEGETATION SAMPLES COLLECTED IN THE VICINITY OF BYRON CLEAN ENERGY CENTER, 202:3 RESULTS IN UNITS OF PCI/KG WET+/- 2 SIGMA COLLECTION SITE PERIOD Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 1-131 Cs-134 Cs-137 Ba-140 La-140 BY-CONTROL Beans 07/31/23

< 24

< 31

< 76

< 38

< 68

< 29

< 66

< 45

< 36

< 32

< 109

< 56 Zucchini/Cucumber 07/31/23

< 20

< 23

< 42

< 22

< 36

< 21

< 41

< 32

< 23

< 18

< 65

< 21 Potatoes 08/07/23

< 18

< 46

< 18

< 40

< 17

< 34

< 22

< 18

< 72

< 24 Com Leaves 08/22/23

< 43

< 33

< 81

< 33

< 80

< 38

< 58

< 57

< 45

< 40

< 176

< 71 MEAN BY-QUAD 1 Onions 07/31/23

< 17

< 41

< 14

< 37

< 17

< 30

< 22

< 18

< 17

< 65

< 21 Onion/Beet Leaves 07/31/23

< 25

< 22

< 56

< 31

< 61

< 26

< 43

< 40

< 26

< 23

< 117

< 41 Cabbage/Beet Leaves/Green Beans 08/07/23

< 18

< 11

< 29

< 17

< 39

< 16

< 28

< 23

< 20

< 17

< 69

< 17 C')

MEAN I

~

BY-QUAD 2 Kohlrabi 07/31/23

< 30

< 39

< 54

< 44

< 84

< 26

< 55

< 49

< 36

< 31

< 128

< 57 Cabbage 07/31/23

< 19

< 20

< 46

< 29

< 37

< 18

< 34

< 30

< 20

< 23

< 84

< 26 Beans 07/31/23

< 30

< 48

< 33

< 67

< 34

< 54

< 51

< 24

< 32

< 147

< 34 Onions 08/26/23

< 26

< 28

< 60

< 32

< 58

< 27

< 31

< 34

< 25

< :27

< 88

< 32 MEAN BY-QUAD 3 Beets 07/31/23

< 26

< 28

< 53

< 33

< 57

< 29

< 43

< 35

< 26

< 24

< 98

< 39 Beet Leaves 07/31/23

< 28

< 26

< 59

< 35

< 55

< 28

< 49

< 46

< 34

< :io

< 143

< 37 MEAN BY-QUAD 4 Beans 07/31/23

< 27

< 22

< 51

< 37

< 65

< 25

< 50

< 43

< 32

< 121

< 49 Onions 07/31/23

< 24

< 18

< 51

< 24

< 49

< 21

< 32

< 33

< 22

< 23

< 108

< 42 Cabbage/Broccoli/Beet Leaves 08/13/23

< 21

< 18

< 40

< 27

< 44

< 20

< 39

< 23

< 22

<,!2

< 84

< 25 MEAN

Table C-IX.1 QUARTERLY OSLO RES UL TS FOR BYRON CLEAN ENERGY CENTER, 2023 RESULTS IN UNITS OF MREM/QUARTER +/- 2 STANDARD DEVIATIONS STATION MEAN CODE

+/- 2 S.D.

JAN - MAR APR - JUN JUL-SEP OCT-DEC BY-01-1 19 +/- 1 19 19 19 19 BY-04-1 22 +/- 3 23 20 23 21 BY-06-1 19 +/- 1 20 19 1n an 10 BY-08-1 (Ctrl) 18 +/- 2 18 19 17 20 BY-21-1 16 +/- 2 17 17 15 16 BY-22-1 23 +/- 3 22 22 25 24 BY-23-1 22 +/- 2 20 22 21 22 BY-24-2 21 +/- 2 21 22 20 20 BY-101-1 17 +/- 1 17 16 17 18 BY-101-2 17 +/- 2 16 17 18 16 BY-102-1 24 +/- 1 24 24 24 24 BY-102-2 24 +/- 4 24 24 27 23 BY-103-1 23 +/- 3 23 20 23 24 BY-103-2 23 +/- 3 22 25 23 22 BY-103-3 20 +/- 3 22 19 21 20 BY-104-1 23 +/- 2 22 23 25 22 BY-104-2 24 +/- 0 24 24 24 24 BY-104-3 21 +/- 4 21 22 21 18 BY-105-1 24 +/- 3 24 26 24 22 BY-105-2 24 +/- 2 25 24 23 25 BY-106-1 23 +/- 3 24 24 21 22 BY-106-2 22 +/- 1 23 22 22 23 BY-107-1 24 +/- 2 24 26 23 24 BY-107-2 24 +/- 3 23 26 24 22 BY-107-3 21 +/- 1 20 21 20 21 BY-108-1 23 +/- 2 24 24 24 22 BY-108-2 22 +/- 3 22 23 20 22 BY-109-1 21 +/- 1 20 21 21 22 BY-109-2 22 +/- 1 22 22 21 22 BY-110-1 21 +/- 3 21 22 20 19 BY-110-2 22 +/- 2 21 21 23 23 BY-111-3 23 +/- 2 24 22 23 24 BY-111-4 21 +/- 3 23 20 22 20 BY-112-3 23 +/- 2 22 24 22 22 BY-112-4 22 +/- 3 23 22 23 20 BY-113-1 22 +/- 3 23 21 24 20 BY-113-2 19 +/- 4 21 17 21 19 BY-114-1 18 +/- 2 19 19 17 18 BY-114-2 21 +/- 4 22 23 19 19 BY-115-1 22 +/- 3 22 24 24 20 BY-115-2 20 +/- 5 20 18 21 24 BY-116-1 20 +/- 2 20 21 18 21 BY-116-2 20 +/- 2 20 21 19 21 BY-116-3 19 +/- 1 20 20 19 19 BY-201-3 22 +/- 3 22 23 20 21 BY-201-4 23 +/- 1 22 24 23 22 BY-202-1 22 +/- 2 21 23 22 21 BY-202-2 24 +/- 2 24 24 25 22 BY-203-1 18 +/- 2 18 19 18 18 BY-203-2 20 +/- 1 20 20 20 19 BY-204-1 19 +/- 4 19 21 16 20 C-15

Table C-IX.1 QUARTERLY OSLO RES UL TS FOR BYRON CLEAN ENERGY CENTER, 2023 RESULTS IN UNITS OF MREM/QUARTER +/- 2 STANDARD DEVIATIONS STATION MEAN CODE

+/-2 S.D.

JAN - MAR APR-JUN JUL-SEP OCT-DEC BY-204-2 24 +/- 3 22 26 24 25 BY-205-1 24 +/- 3 22 25 22 25 BY-205-2 22 +/- 2 21 23

')".>

22

<...J BY-206-1 23 +/- 2 22 24 24 22 BY-206-2 23 +/- 2 23 22 24 22 BY-207-1 24 +/- 2 23 25 23 24 BY-207-2 23 +/- 3 21 25 24 22 BY-208-1 25 +/- 1 24 26 25 25 BY-208-2 22 +/- 3 22 25 21 22 BY-209-1 24 +/- 2 23 25 24 23 BY-209-4 25 +/- 3 23 27 24 25 BY-210-3 23 +/- 2 22 24 23 23 BY-210-4 21 +/- 2 20 22 22 20 BY-211-1 23 +/- 2 22 24 23 23 BY-211-4 23 +/- 2 22 23 25 23 BY-212-1 24 +/- 2 23 25 23 25 BY-212-4 25 +/- 4 24 28 24 24 BY-213-1 24 +/- 3 21 25 25 24 BY-213-4 24 +/- 7 22 20 25 28 BY-214-1 24 +/- 1 23 24 24 24 BY-214-4 23 +/- 1 22 24 23 23 BY-215-1 22 +/- 1 23 22 21 23 BY-215-4 23 +/- 3 23 24 22 25 BY-216-1 25 +/- 3 24 26 27 24 BY-216-2 22 +/- 2 22 23 22 23 BY-301-1 16 +/- 1 17 16 17 15 BY-301-2 18 +/- 2 19 19 17 17 BY-309-1 22 +/- 1 22 22 21 21 BY-309-2 22 +/- 2 23 23 21 22 BY-309-3 21 +/- 1 21 21 22 20 BY-309-4 20 +/- 4 22 20 21 18 BY-314-2 17 +/- 2 17 15 17 17 (1) SEE PROGRAM EXCEPTIONS SECTION FOR EXPLANATION C-16

(")

I.....

--..J TABLE C-IX.2 MEAN QUARTERLY OSLO RES UL TS FOR THE INNER RING, OUTER RING, SPECIAL INTEREST, OTHER AND CONTROL LOCATIONS FOR BYRON CLEAN ENERGY CENTER, 2023 COLLECTION PERIOD JAN-MAR APR-JUN JUL-SEP OCT-DEC TABLE C-IX.3 RESULTS IN UNITS OF MILLIREM/STD. QUARTER+/- 2 STANDARD DEVIATION INNER RING

+/-2 S.D.

22 +/- 4 22 +/- 5 22 +/- 5 21 +/- 4 OUTER RING SPECIAL INTEREST OTHER

+/-2 SD.

+/-2 S.D.

22 +/- 3 20 +/- 5 20 +/- 4 24 +/- 4 19 +/- 6 20 +/- 4 23 +/- 4 19 +/- 5 20 +/- 7 23 +/- 4 19 +/- 5 20 +/- 5

SUMMARY

OF THE AMBIENT DOSIMETRY PROGRAM FOR BYRON CLEAN ENERGY CENTER, 2023 CONTROL

+/-2 S.D. -

18 +/- 0 19 +/- 0 17 +/- 0 20 +/- 0 RESULTS IN UNITS OF MILLI REM/STD. QUARTER+/- 2 STANDARD DEVIATION SAMPLES PERIOD PERIOD PERIOD MEAN LOCATION ANALYZED MINIMUM MAXIMUM

+/-2 S.D. -

INNER RING 144 16 27 22 +/- 4 OUTER RING 128 16 28 23 +/- 4 SPECIAL INTEREST 28 15 23 19 +/- 5 OTHER 28 15 25 20 +/- 5 CONTROL 4

17 20 18 +/- 2 INNER RING STATIONS - BY-101-1, BY-101-2, BY-102-1, BY-102-2, BY-103-1, BY-103-2, BY-103-3, BY-104-1, BY-104-2, BY-104-3, BY-105-1, BY-105-2, BY-106-1, BY-106-2, BY-107-1, BY-107-2, BY-107-3, BY-108-1, BY-108-2, BY-109-1, BY-109-2, BY-110-1, BY-110-2, BY-111-3, BY-111-4, BY-112-3, BY-112-4, BY-113-1, BY-113-2, BY-114-1, BY-114-2, BY-115-1, BY-115-2, BY-116-1, BY-116-2, BY-116-3 OUTER RING STATIONS-BY-201-3, BY-201-4, BY-202-1, BY-202-2, BY-203-1, BY-203-2, BY-204-1, BY-204-2, BY-205-1, BY-205-2, BY-206-1, BY-206-2, BY-207-1, BY-207-2, BY-208-1, BY-208-2, BY-209-1, BY-209-4, BY-210-3, BY-210-4, BY-211-1, BY-211-4, BY-212-1, BY-212-4, BY-213-1, BY-213-4, BY-214-1, BY-214-4, BY-215-1, BY-215-4, BY-216-1, BY-216-2 SPECIAL INTEREST STATIONS - BY-301-1, BY-301-2, BY-309-1*, BY-309-2*, BY-309-3*, BY-309-4*, BY-314-2 OTHER STATIONS - BY-01-1, BY-04-1, BY-06-1, BY-21-1, BY-22-1,BY-23-1, BY-24 CONTROL STATION - BY-08-1

For !SFS! Monitoring

FIGURE C-1 Surface Water - Gross Beta - Stations BY-12 and BY-29 (C)

Collected in the Vicinity of BCEC, 2000 - 2023 BY-12 Oregon Pool of Rock River, Downstream 10.0 8.0 6.0 4.0 2.0 0.0 --------------------+---------+

01-25-00 01-17-06 01-10-12 01-02-18 BY-29 (C) Byron, Rock River Upstream 14.0 12.0 10.0 8.0 u

a.

6.0 4.0 2.0 00 01-25-00 01-17-06 01-10-12 01-02-18 DUE TO VENDOR CHANGE IN 2005, < VALUES ARE LLD VALUES JANUARY THROUGH JUNE 2005 ANO MOC VALUES AFTER JUNE 2005 C-18 12-26-23 12-26-23

! u C.

! u FIGURE C-2 Surface Water - Tritium - Stations BY-12 and BY-29 (C)

Collected in the Vicinity of BCEC, 2000 - 2023 BY-12 Oregon Pool of Rock River, Downstream 10000 1000 100 10 ------1-------1--------+--------1 03-28-00 03-06-06 02-12-12 01-20-18 12-29-23 BY-29 (C) Byron, Rock River Upstream 250 200 150 C.

100 50 0

03-28-00 03-06-06 02-12-12 01-20-18 12-29-23 DUE TO VENDOR CHANGE IN 2005, < VALUES ARE LLD VALUES JANUARY THROUGH JUNE 2005 AND MDC VALUES AFTER JUNE 2005 C-19

u C.

FIGURE C-3 Ground Water - Tritium - Station BY-14-1 Collected in the Vicinity of BCEC, 2000 - 2023 BY-14-1 3200 N. German Church Road Well 250 200 150 100 50 0

01-04-00 12-13-05 11-22-11 10-31-17 10-10-23 DUE TO VENDOR CHANGE IN 2005, < VALUES ARE LLD VALUES JANUARY THROUGH JUNE 2005 AND MDC VALUES AFTER JUNE 2005 C-20

FIGURE C-4 Ground Water - Tritium - Station BY-18-1 Collected in the Vicinity of BCEC, 2010 - 2023 BY-18-1 Calhoun Well 250 200 150 100 50 0-l-------1-----____. ____

I-07-01-10 10-26-13 02-20-17 06-17-20 10-13-23 C-21

! u C.

FIGURE C-5 Ground Water - Tritium - Station BY-32 Collected in the Vicinity of BCEC, 2000 - 2023 BY-32 Krueger Well 250 200 150 100 50 0

01-01-00 12-11-05 11-21-11 10-31-17 10-11-23 DUE TO VENDOR CHANGE IN 2005, < VALUES ARE LLD VALUES JANUARY THROUGH JUNE 2005 AND MDC VALUES AFTER JUNE 2005 C-22

FIGURE C-6 Ground Water - Tritium - Station BY-35 Collected in the Vicinity of BCEC 2006 - 2023 BY-35 Vancko Well 250 200 150 100 50 0+---------+--------+-------+-

04-01-06 02-03-12 12-07-17 10-11-23 C-23

..J

~

C.

FIGURE C-7 Ground Water - Tritium - Station BY-37 Collected in the Vicinity of BCEC, 2006 - 2023 BY-37 Cavage Well 250 200 150 100 50 0

04-01-06 02-03-12 12-07-17 10-11-23 Ground Water - Tritium - Station BY-38 Collected in the Vicinity of BCEC, 2006 - 2023 BY-38 Steve Storz Well 250 200 150 100 50 o-1------+------+------------+-

07-13-15 08-04-17 08-27-19 09-18-21 10-11-23 C-24

FIGURE C-8 Air Particulate - Gross Beta - Stations BY-08 (C) and BY-21 Collected in the Vicinity of BCEC, 2000 - 2023 60.0 50.0 e

4o.o

~

c.

30.0 0 w 0

20.0 10.0 BY-08 (C) Leaf River WNW 0.0 +--------+-------+-------+----------1 01-04-00 60.0 50.0

'E 4o.o

~

c.

30.0 q

w

~

20.0 10.0 01-03-06 01-03-12 01-02-18 01-02-24 BY-21 Byron Nearsite N 0.0 +--------+-------+-------+----------1 01-04-00 01-03-06 01-03-12 01-02-18 01-02-24 C-25

FIGURE C-9 Air Particulate - Gross Beta - Stations BY-22 and BY-23 Collected in the Vicinity of BCEC, 2000 - 2023 60.0 50.0 M

40.0

.§ u

c.

30.0 M

'T w

~

20.0 10.0 BY-22 Byron Nearsite SE 0.0 +--------------+-------+-------

01-04-00 60.0 50.0 M

40.0

.§ u

c.

30.0 M

'T w

~

20.0 100 01-03-06 01-03-12 01-02-18 01-02-24 BY-23 Byron Nearsite S 0.0 +--------1-------------+---------f 01-04-00 01-03-06 01-03-12 01-02-18 01-02-24 C-26

FIGURE C-10 Air Particulate - Gross Beta - Station BY-24 Collected in the Vicinity of BCEC, 2000 - 2023 M

70.0 60.0 50.0

.§ u 40.0 C.

M

~

30.0 0...

20.0 10.0 BY-24 Byron Nearsite SW 0.0 +--------+-------------------1 01-04-00 01-03-06 01-03-12 01-02-18 01-02-24 C-27

FIGURE C-11 Air Particulate - Gross Beta - Stations BY-01 and BY-04 Collected in the Vicinity of BCEC, 2005 - 2023 60.0 50.0 e

4o.o r,

a.

30.0 0 w

~

20.0 10.0 BY-01 Byron N 0.0 +-------,~------1------t------;--------1 07-05-05 60.0 50.0 40.0

-E u

a.

30.0 0 w o

20.0 10.0 03-17-09 11-27-12 08-09-16 04-21-20 01-02-24 BY-04 Paynes Point SE 0.0 --------------------------

07-05-05 03-17-09 11-27-12 08-09-16 04-21-20 01-02-24 Regular analysis of far field air particulate & gross beta did not take place prior to 2005 C-28

FIGURE C-12 Air Particulate - Gross Beta - Station BY-06 Collected in the Vicinity of BCEC, 2005 - 2023 BY-06 Oregon SSW 60.0 50.0 M

40.0

.§ u

c.

30.0 M

0 w

~

20.0 100 00+------+-----+----~f-------+------l 07-05-05 03-17-09 11-27-12 08-09-16 04-21-20 01-02-24 Regular analysis of far field air particulate & gross beta did not take place prior to 2005 C-29

Intentionally left blank

APPENDIX D INTER-LABORATORY COMPARISON PROGRAM

Intentionally left blank

Analytics Environmental Radioactivity Cross Check Program Table D.1 Teled:c:ne Brown En9ineerin9 Environmental Services Identification TSE Known Ratio of TSE to Month/Year Number Matrix Nuclide Units Reported Value (a)

Analytics Result Evaluation (bJ Value March 2023 E13826 Milk Sr-89 pCi/L 70.5 93.1 0.76 w

Sr-90 pCi/L 12.3 147 0.84

/1, E13827 Milk Ce-141 pCi/L 127 139 0.91 A

Co-58 pCi/L 119 131 0.91 A

Co-60 pCi/L 250 279 0.90 A

Cr-51 pCi/L 246 302 0.82 A

Cs-134 pCi/L 172 200 0.86 A

Cs-137 pCi/L 125 140 0.89 A

Fe-59 pCi/L 122 122 1.00 A

1-131 pCi/L 70.2 82.0 0.86 A

Mn-54 pCi/L 165 180 0.92 A

Zn-65 pCi/L 306 306 1.00 A

E13828 Charcoal 1-131 pCi 79.0 89.9 0.88 A

E13829 AP Ce-141 pCi 91.9 87.8 1 05 A

Co-58 pCi 87.5 82.5 1 06 A

Co-60 pCi 199 176 1.13 A

Cr-51 pCi 218 191 1.14 A

Cs-134 pCi 119 126 0.94 A

Cs-137 pCi 92.4 88.7 1.04 A

Fe-59 pCi 95.5 76.9 1.24 w

Mn-54 pCi 120 113 1.06 A

Zn-65 pCi 17'9 193 0.93 A

E13830 Soil Ce-141 pCi/g 0.224 0.220 1 02 A

Co-58 pCi/g 0.193 0.207 0.93 A

Co-60 pCi/g 0.406 0.441 0.92 A

Cr-51 pCi/g 0.464 0.477 0.97 A

Cs-134 pCi/g 0.334 0.316 1 06 A

Cs-137 pCi/g 0.270 0.288 0.94 A

Fe-59 pCi/g 0.183 0.193 0.95 A

Mn-54 pCi/g 0.263 0.284 0.93 A

Zn-65 pCi/g 0.475 0.484 0.98 A

E13831 AP Sr-89 pCi 99.4 90.8 1 09 A

Sr-90 pCi 14.6 14.3 1.02 A

(a) The Analytics known value is equal to 100% of the parameter present in the standard as determined by gravimetric and/or volumetric measurements made during standard preparation (b} Analytics evaluation based on TBE internal QC limits.

A= Acceptable - reported result falls within ratio limits of0.80-1.20 W = Acceptable with warning - reported result falls within 0. 70-0. 80 or 1. 20-1.30 N = Not Acceptable - reported result falls outside the ratio limits of< 0. 70 and> 1.30 (Page 1 of 2)

Analytics Environmental Radioactivity Cross Check Program Table D.1 Teledlne Brown En9ineerin9 Environmental Services Identification TBE Known Ratio ofTBE to Month/Year Number Matrix Nuclide Units Reported Value (a)

Analytics Result Evaluation lb)

Value September 2023 E13832 Milk Sr-89 pCi/L 49.8 71.4 0.70 w

Sr-90 pCi/L 7.28 12.8 0.57

!'/1)

E13833 Milk Ce-141 pCi/L 93.4 104 0.90 A

Co-58 pCi/L 58.2 65.8 0.88 A

Co-60 pCi/L 190 223 0.85 A

Cr-51 pCi/L 207 205 1 01 A

Cs-134 pCi/L 96.0 114 0.84 A

Cs-137 pCi/L 121 141 0.86 A

Fe-59 pCi/L 78.8 78.8 1.00 A

1-131 pCi/L 27.9 37.4 0.75 w

Mn-54 pCi/L 128 146 0.88 A

Zn-65 pCi/L 185 203 0.91 A

E13834 Charcoal 1-131 pCi 76.9 78.7 0.98 A

E13835 AP Ce-141 pCi 91.9 87.1 1 05 A

Co-58 pCi 58.7 55.2 1 06 A

Co-60 pCi 200 187 1 07 A

Cr-51 pCi 192 172 1.12 A

Cs-134 pCi 89.6 96 0.94 A

Cs-137 pCi 109 119 0.92 A

Fe-59 pCi 68.3 66.1 1.03 A

Mn-54 pCi 129 123 1.05 A

Zn-65 pCi 163 171 0.96 A

E13836 Soil Ce-141 pCi/g 0.228 0.184 1.24 w

Co-58 pCi/g 0.103 0.116 0.89 A

Co-60 pCi/g 0.364 0.394 0.92 A

Cr-51 pCi/g 0.371 0.362 1.02 A

Cs-134 pCi/g 0176 0.202 0.87 A

Cs-137 pCi/g 0.285 0.315 0.90 A

Fe-59 pCi/g 0.140 0139 1.00 A

Mn-54 pCi/g 0.237 0.259 0.92 A

Zn-65 pCi/g 0.349 0.359 0.97 A

E13837 AP Sr-89 pCi 74.6 80.2 0.93 A

Sr-90 pCi 13.9 14.4 0.96 A

(a) The Analytics known value is equal to 100% of the parameter present in the standard as determined by gravimetric and/or volumetric measurements made during standard preparation (b)

Analytics evaluation based on TBE internal QC limits:

A = Acceptable - reported result falls within ratio limits of 0. 80-1. 20 W = Acceptable with warning - reported result falls within 0 70-0. 80 or 1. 20-1. 30 N = Not Acceptable - reported result falls outside the ratio limits of< 0. 70 and > 1.30 (1) See NCR 23-24 (Page 2 of 2)

DOE's Mixed Analyte Performance Evaluation Program (MAPEP)

Table D.2 Teledyne Brown Engineering Environmental Services Identification TBE Known Acceptance Month/Year Number Matrix Nuclide Units Reported Value (a)

Range Evaluation (b)

Value February 2023 23-MaS48 Soil Ni-63 Bq/kg 294 1130 791-1469 Nl3) 23-MaSU48 Urine Cs-134 Bq/L 9.92 10 6.7 - 12.4 A

Cs-137 Bq/L 0.0994

( 1)

A Co-57 Bq/L 9.35 8.67 6.07 -11.27 A

Co-60 Bq/L 9.03 8.13 5.69 - 10.57 A

Mn-54 Bq/L 11.80 100 7.0 - 13.0 A

U-234 Bq/L 0.01 Not spiked U-238 Bq/L 0.01 Not spiked Zn-65 Bq/L 10.60 9.29 6.50 - 12.08 A

23-MaW48 Water Ni-63 Bq/L 23.1 27.3 19.1-35.5 A

23-RdV48 Vegetation Cs-134 Bq/sample 5.6 7.6 5.32 - 9.88 w

Cs-137 Bq/sample 0.03 (1)

A Co-57 Bq/sample 5.9 6.9 4.85 - 9.01 A

Co-60 Bq/sample 5.00 6.51 4.56 - 8.46 w

Mn-54 Bq/sample 6.08 8.03 5.62 - 10.44 w

Sr-90 Bq/sample 0.05 (1)

Ni4l Zn-65 Bq/sample 5.49 7.43 5.20-9.66 w

August 2023 23-MaS49 Soil Fe-55 Bq/kg 346 1280 896 - 1664 N1s1 Ni-63 Bq/kg 1260 1370 959-1781 A

23-MaW49 Water Ni-63 Bq/L 1.0 (2)

A 23-RdV49 Vegetation Cs-134 Bq/sample 3.860 4.98 3.49-6.47 w

Cs-137 Bq/sample 0.027 (1)

A Co-57 Bq/sample 3.88 4.24 2.97 - 5.51 A

Co-60 Bq/sample 2.37 2.79 1.95 - 3.63 A

Mn-54 Bq/sample 2.04 2.56 1.79-3.33 w

Sr-90 Bq/sample 0.96 1.17 0.82 - 1.52 A

Zn-65 Bq/sample

-0.514 (1)

A (a) The MAPEP known value is equal to 100% of the parameter present in the standard as determined by gravimetric and/or volumetric measurements made during standard preparation (b) DOE/MAPEP evaluation A = Acceptable - reported result falls within ratio limits of O 80-120 W = Acceptable with warning - reported result falls within O 70-0.80 or 1.20-1.30 N = Not Acceptable - reported result falls outside the ratio limits of< 0 70 and> 1.30 (1) False positive test (2) Sensitivity evaluation (3) See NCR 23-08 (4) See NCR 23-09 (5) Initial evaluation - See CAR 23-31 (Page 1 of 1)

ERA Environmental Radioactivity Cross Check Program Table D.3 Teledyne Brown Engineering Environmental Services Identification TBE Reported Known Acceptance Evaluation (bl Month/Year Number Matrix Nuclide Units Value Value (al Limits March 2023 MRAD-38 Water Am-241 pCi/L 28.1 32.1 22.0 - 41.0 A

Fe-55 pCi/L 1180 1380 811-2010 A

Pu-238 pCi/L 65.6 70.7 42.5 - 91.6 A

Pu-239 pCi/L 82.9 92.4 57.2-114 A

Soil Sr-90 pCi/kg 2630 2580 803 - 4020 A

AP GR-A pCi/filter 69.6 76.8 40.1 - 127 A

GR-8 pCi/filter 36.8 32.8 19.9 - 49.6 A

April 2023 RAD-133 Water Ba-133 pCi/L 26.0 22.3 17.1 - 25.8 N(1J Cs-134 pCi/L 72.1 77.6 63.4 - 85.4 A

Cs-137 pCi/L 62.1 63.1 56.8 - 72.2 A

Co-60 pCi/L 32.6 30.3 26.7-36.1 A

Zn-65 pCi/L 253 242 218-283 A

GR-A pCi/L 34.2 29.2 14.9 - 38.2 A

GR-8 pCi/L 64.3 60.7 41.8-67.4 A

U-Nat pCi/L 61.75 62.7 51.2 - 69.0 A

H-3 pCi/L 13,300 12700 11,100 - 14,000 A

Sr-89 pCi/L 67.0 61.1 49.2 - 69.0 A

Sr-90 pCi/L 36.5 36.0 26.4-41.5 A

1-131 pCi/L 24.3 28.7 23.9 - 33.6 A

September 2023 MRAD-39 Water Am-241 pCi/L 54.0 71.0 48.7 - 90.8 A

Fe-55 pCi/L 2430 2630 1550 - 3830 A

Pu-238 pCi/L 172 177 106 - 229 A

Pu-239 pCi/L 171 182 113 - 224 A

Soil Sr-90 pCi/kg 9580 6800 2120 -10,600 A

AP GR-A pCi/filter 82.2 79.8 41.7-131 A

GR-8 pCi/filter 54.3 42.6 25.8 - 64.4 A

October 2023 RAD-135 Water Ba-133 pCi/L 86.3 92.2 73.8-111 A

Cs-134 pCi/L 38.4 41.2 27.9 - 54.5 A

Cs-137 pCi/L 194 199 161 - 237 A

Co-60 pCi/L 49.5 47.8 33.8 - 61.8 A

Zn-65 pCi/L 59.7 57.0 23.7 - 90.3 A

GR-A pCi/L 53.2 70.6 54.0 - 87.2 N(2J GR-8 pCi/L 46.9 42.2 30.5 - 53.9 A

U-Nat pCi/L 51.26 51.7 45.9-57.5 A

H-3 pCi/L 20,100 22,900 19,700 - 26,100 A

Sr-89 pCi/L 51.1 38.2 25.2 - 51.2 A

Sr-90 pCi/L 31.7 35.7 30.3-411 A

1-131 pCi/L 23.5 29.7 25.8 - 33.6 N(3J (a) The ERA known value is equal to 100% of the parameter present in the standard as determined by gravimetric and/or volumetric measurements made during standard preparation.

(b) ERA evaluation.

A = Acceptable - Reported value falls within the Acceptance Limits N = Not Acceptable - Reported value fails outside of the Acceptance Limits (1) See NCR 23-10 (2) See NCR 23-20 (3) See NCR 23-21 (Page 1 of 1)

APPENDIX E EFFLUENT REPORT

Intentionally left blank

Table of Contents Summary.................................................................................................................................... 1 lntroduction................................................................................................................................. 2 1.0. Gaseous Effluents to the A.tmosphere................................................................................. 3 2.0. Solids Radioactive Waste.................................................................................................... 3 3.0. Dose Limits to Members of the Public................................................................................. 3 4.0. Site Meteorology.................................................................................................................4 APPENDIX E-1 Effluent and Waste Disposal Reports Table 1 Gaseous Effluents................................................................................................... E-1-1 Table 2 Liquid Effluents........................................................................................................ E-1-3 Table 3 Summary of Gaseous and Liquid Effluents Doses (10CFR50)................................ E-1-5 Table 4 Summary of Doses to Members of the Public (40CFR190 & 10CFR72.104)........... E-1-5 Table 5 Maximum Annual Calculated Cumulative Offsite Doses.......................................... E-1-6

Summary Calculations based on gaseous and liquid effluents and meteorological data indicate that public dose due to radioactive material attributable to Byron Clean Energy Center during the period does not exceed regulatory or Offsite Dose Calculation Manual (ODCM) limits.

The Totai Effective Dose Equivalent (TEDE) due to licensed activities at Byron Clean Energy Center calculated for the maximum exposed individual for the period is 4.86E-01 mrem. The annual limit on TEDE is 100 mrem.

The assessment of radiation doses to the public is performed in accordance with the ODCM. The results of these analyses confirm that the station is operating in compliance with 1 0CFR50 Appendix I, 1 0CFR20 and 40CFR190.

There were no additional operational controls implemented which affected the areas of radiological effluents in 2023.

There were no measurements which exceeded the reporting levels, including any which would not have been attributable to station effluents.

The results of the current radiological environmental monitoring program are approximately the same as those found during the pre-operational studies conducted at Byron Clean Energy Center.

E-1

Introduction Liquid effluents from Byron Clean Energy Center are released to the Rock River in controlled batches after radioassay of each batch. Gaseous effluents are released to the atmosphere and are calculated on the basis of analyses of weekly grab samples and grab samples of batch releases prior to the release of noble gases as well as continuously collected composite samples of iodine and particuiate radioactivity sampled during the course of the year. The results of effluent analyses are summarized on a monthly basis. Airborne concentrations of noble gases, 1-131, and particulate radioactivity in offsite areas are calculated using isotopic composition of effluents and meteorological data. Carbon-14 (C-14) concentration in offsite areas is calculated based on industry-approved methodology for estimation of the amount released and meteorological data.

Environmental monitoring is conducted by sampling at indicator and control (background) locations in the vicinity of Byron Clean Energy Center to measure changes in radiation or radioactivity levels that may be attributable to station operation.

If significant changes attributable to Byron Station are measured, these changes are correlated with effluent releases. An environmental monitoring program is conducted which also includes all potential pathways at the site. Gaseous pathways include ground plane (direct), inhalation, vegetation, meat, and milk. Liquid pathways include potable water and freshwater fish. The critical pathway for 2023 gaseous dose was vegetation. The critical pathway for 2023 liquid dose was freshwater fish.

E-2

1.0 Gaseous Effluents to the Atmosphere Measured concentrations and isotopic composition of noble gases radioiodine, tritium and particulate radioactivity released to the atmosphere during the year are listed in Table 1. The average quarterly release rate for all gaseous effluents were below detectable limits.

A total of 1.05E+00 curies of fission and activation gases \\"Jere released.

A total of 8.47E+00 curies of other (C-14) radioisotopes were released.

A total of 7.76E+01 curies of tritium were released.

lodine-131 and gross alpha-emitting radionuclides were below detectable limits.

2.0 Solid Radioactive Waste Solid radioactive wastes were shipped by truck. For detail, refer to Byron Clean Energy Center 2023 Annual Radiological Effluent Release Report.

3.0 Dose Limits to Members of the Public Byron Clean Energy Center did not exceed any of the dose limits as shown below based on concurrent or historical meteorological data.

The limits on dose or dose commitment to a member of the public due to radioactive materials in liquid effluents from each reactor is 1.5 mrem to the whole body or 5 mrem to any organ during any calendar quarter and 3 mrem to the whole body or 10 mrem to any organ during a calendar year.

The limits on air dose in noble gases released in gaseous effluents to a member of the public from each reactor is 5 mrad for gamma radiation or 10 mrad for beta radiation during any calendar quarter and 10 mrad for gamma radiation or 20 mrad for beta radiation during a calendar year.

The limits on dose to a member of the public due to radioactive iodine &

particulate with half-lives greater than eight days in gaseous effluents released from each reactor is 7.5 mrem to any organ during any calendar quarter and 15 mrem during a calendar year.

The annual 1 0CFR20 limit on Total Effective Dose Equivalent to individual members of the public is 100 mrem.

The 40CFR 190 limits on individual members of the public is 25 mrem to the whole body, 25 mrem to any organ (except thyroid), and 75 mrem to the thyroid.

E-3

4.0 Site Meteorology Detailed records of the site meteorological measurements taken during each calendar quarter of the year are maintained by the meteorological vendor, retained on site, and are available upon request. The data are presented as cumulative joint frequency distributions of the wind direction for the 250' level and wind speed class by atmospheric stability class determined from the temperature difference between the 250' and 30' ieveis. Data recovery for all measurements on the meteorological tower was 99.6% during 2023.

E-4

Intentionally left blank

APPENDIX E-1 EFFLUENT AND WASTE DISPOSAL REPORT DATA TABLES

Intentionally left blank

Table 1 GASEOUS EFFLUENTS SUMMATION OF ALL RELEASES UNIT 1 REPORT FOR 2023 Units QTR 1 QTR 2 QTR 3 QTR4 YEAR Fission & Activation Gases 1

Tl""\\f.-,,1 0,.....1,.....,...,...,...,.

2.15E-01 1.01 E-0-1 1.70E-0i i.36E-01 6.22E-01 I.

I ULCH l'\\c:;fc;Q~c;

\\..,I

2. Avg. Release Rate

µCi/sec 2.76E-02 1.28E-02 2.14E-02 1.71E-02 lodine-131

1. Total Release Ci (1)

(1)

2. Avg. Release Rate

µCi/sec (1)

(1)

Particulates Half Life >= 8 days

1. Total Release Ci (1)

(1)

2. Avg. Release Rate

µCi/sec (1)

(1)

Carbon-14

1. Total Release Ci 8.28E-01 1.11 E+00 1.10E+00 1.12E+00 4.17E+00

2. Avg. Release Rate

µCi/sec 1.06E-01 1.41 E-01 1.39E-01 1.41E-01 Tritium

1. Total Release Ci 5.61 E+00 3.63E+00 1.66E+00 3.43E+00 1.43E+01

2. Avg. Release Rate

µCi/sec 7.22E-01 4.62E-01 2.09E-01 4.32E-01 Gross Alpha Radioactivity

1. Total Release Ci (1)

(1)

2. Avg. Release Rate

µCi/sec (1)

(1)

(1) Less than minimum detectable activity which meets the lower limit of detection (LLD) requirements of TRM Section 3.11 E-1-1

Table 1 (cont.)

GASEOUS EFFLUENTS SUMMATION OF ALL RELEASES UNIT2 REPORT FOR 2023 Units QTR 1 QTR 2 QTR 3 QTR4 YEAR Fission & Activation Gases

1. Total Release Ci 1.86E-0*1 3.38E-02 i.26E-01 8.25E-02 4.28E-01

2. Avg. Release Rate

µCi/sec 2.39E-02 4.30E-03 1.59E-02 1.04E-02 lodine-131

1. Total Release Ci (1)

(1)

2. Avg. Release Rate

µCi/sec (1)

(1)

Particulates Half Life >= 8 days

1. Total Release Ci (1)

(1)

2. Avg. Release Rate

µCi/sec (1)

(1)

Carbon-14

1. Total Release Ci 1.13E+00 1.10E+00 1.17E+00 8.98E-01 4.30E+00

2. Avg. Release Rate

µCi/sec 1.45E-01 1.40E-01 1.47E-01 1.13E-01 Tritium

1. Total Release Ci 2.31 E+01 1.10E+01 1.71 E+01 1.21 E+01 6.33E+01

2. Avg. Release Rate

µCi/sec 2.97E+00 1.40E+00 2.15E+00 1.52E+00 Gross Alpha Radioactivity

1. Total Release Ci (1)

(1)

2. Avg. Release Rate

µCi/sec (1)

(1)

(1) Less than minimum detectable activity which meets the lower limit of detection (LLD) requirements of TRM Section 3.11 E-1-2

Table 2 LIQUID EFFLUENTS SUMMATION OF ALL RELEASES UNIT 1 REPORT FOR 2023 Units QTR 1 QTR2 QTR3 QTR4 YEAR Fission and Activation Products

1. Total Release Ci 2.40E-03 7.05E-04 6.61E-04 4.98E-03 8.75E-03

2. Avg. Diluted Cone.

µCi/ml 6.63E-10 2.87E-10 1.79E-10 2.08E-09 7.20E-10 Tritium

1. Total Release Ci 7.86E+02 9.87E+01 4.94E+02 1.87E+02 1.57E+03

2. Avg. Diluted Cone.

µCi/ml 2.17E-04 4.03E-05 1.34E-04 7.84E-05 1.29E-04 Dissolved & Entrained Gases

1. Total Release Ci 4.45E-04 (1)

(1) 1.SSE-04 6.00E-04

2. Avg. Diluted Cone.

µCi/ml 1.23E-10 N/A N/A 6.49E-11 4.94E-11 Gross Alpha Radioactivity

1. Total Release Ci (1)

(1)

Volume of liquid waste Liters 3.62E+09 2.45E+09 3.69E+09 2.39E+09 1.21E+10 Volume of dil. water Liters 7.24E+09 4.90E+09 7.38E+09 4.77E+09 2.43E+10 (1) Less than minimum detectable activity which meets the lower limit of detection (LLD) requirements of TRM Section 3. 11 E-1-3

Table 2 (cont.)

LIQUID EFFLUENTS SUMMATION OF ALL RELEASES Unit 2 REPORT FOR 2023 Units QTR 1 QTR 2 QTR 3 QTR4 YEAR Fission and Activation Products

1. Total Release Ci 2.40E-03 7.05E-04 6.61 E-04 4.98E-03 8.75E-03

2. Avg. Diluted Cone.

µCi/ml 6.63E-10 2.87E-10 1.79E-10

'J n,u::::_no 7 'Jf"IC 1 f"I

£-.vvt--vv I.£..VL-IU Tritium

1. Total Release Ci 7.86E+02 9.87E+01 4.94E+02 1.87E+02 1.57E+03

2. Avg. Diluted Cone.

µCi/ml 2.17E-04 4.03E-05 1.34E-04 7.84E-05 1.29E-04 Dissolved & Entrained Gases

1. Total Release Ci 4.45E-04 (1)

(1) 1.55E-04 6.00E-04

2. Avg. Diluted Cone.

µCi/ml 1.23E-10 N/A N/A 6.49E-11 4.94E-11 Gross Alpha Radioactivity

1. Total Release Ci (1)

(1)

Volume of liquid waste Liters 3.62E+09 2.45E+09 3.69E+09 2.39E+09 1.21E+10 Volume of dil. water Liters 7.24E+09 4.90E+09 7.38E+09 4.77E+09 2.43E+10 (1) Less than minimum detectable activity which meets the lower limit of detection (LLD) requirements of TRM Section 3.11 E-1-4

Table 3 Summary of Gaseous and Liquid Effluents Doses to Members of the Public at the Highest Dose Receptors vs 10CFR50 Design Objectives Unit 1

--- --- ~*-----

Noble Gas Applicable Dose

% of Estimated Age Dose Group Applicable Limit Design Unit Objective Limit (per year, combined)

-- ---------- ---i ------1-------t---

~v~aximum Location i Gamma Air 1 1. ?0E-04 Aii

1.70E-03 10

! mrad Maxi~*,:;:;-Loccrtion:=setaA;;:-Dos-e t6.29E-05 _

All 3.15E-04 20 I mrad.

Ma_xin,u111_ L~c~ti()n '-- _To.!_al~o~y _ L 1J>1!=:-Q4.. _A_II __ =-3.22E~03

___ __-_ __-5__-- __-.

pn~em

~~xi_ni.t:illl_ L~ca!io_n !

_§kin __ L 2.33E-04_

All 1.55E-03 15 1 mrem i

.. i i

NO~:!'~~as --

Bone

-1~os,~+~*-

-Child 725E+DD *

- I mrem~

f - -

-t - -- -

- *r- -- -- i I

--~ig_lli~ -

- L ___ J L --~a~im~f!l___

_To.!_alBO.~Y_

1_:~1_E-_()? __ C::h}d _____ 5.:.03_E-:()_1 __ __ '.3_ ___.. f-! m_re_m---,1 L _ _lv1aximum GI-Lli 1.54E-02 Child 1.54E-01 :

-~---~-

10

_J mrem:

Unit 2

--*--*----G-----*

1

% f i

Design 1

Applicable Estimated.

1 Age A

01* 0 bl i Objective Limit I pp 1ca e 1 Dose Dose

, Group Limit (per ~ear, I

combined)

--~-~

Noble Gas Unit Maximum Location

Gamma Air 9.93E-05 All 9.93E-04 10

----- ----------+------+- ---

iyi_aximum_ L~t:clti()_f2 : __ B~Ja Air Dose, 4.05E-05 4 _A_ll ____ ~:Q3~-~

__ -~0-

_ 1 _ mrad I Maximum Locatio11~_Tot~~.c:>~Y- __ _§.39E-05 L _

_811 1.88E-03 5 __ _j.mrem I I Maximum Location i Ski_f2__

1.38E-04 I

All 9.19E-04 i 15 I mrem 1

I

~ Non-Noble Gas I

I __ _______

_ ______ 1 1

Maximum I

Bone

1.12E+00 4 Child 7.48E+00.

15 mre111_i r-:~~!m I- -:la180~~ ~ 1~51E-02 i Cnild- - SQ3E:*1-! *** -~-

7 :r:

t-=-~aximum. =-T-=-_GI-Ui _ --1 _

1.54E-02 [- Child =

.1.54E-01-\\=--

1 O __ j_ mrem J Table 4 Summary of Doses to Members of the Public at the Highest Dose Receptors for 40CFR190 and 10CFR72.104 Compliance I-*------,-----

~-----i Highest I

N bl Non-On-Site I

% of

. ~::~:::

12 :~~:4 i-.:!:!:1 ; 3~::i:2 ! :;::~::j.:;01: ~P~!:~::e I L~:it ! :.r::

o.r.ga_n ~()s~ L -~IA_ j2.21 E+00 i _ 3.08E-02 1 0.QQE_+0_0_ L2.?4~+Q~_l ~.97f=.-+-0_Q J_ _2!5_ :_mr~m_l E-1-5

Table 5 MAXIMUM ANNUAL CALCULATED CUMULATIVE OFFSITE DOSES Resulting from Airborne Releases Based on Concurrent Meteorological Data 2023 Unit 1:

Dose gamma air (ii beta air (2l whole body (3l skin (4l organ (5l (child-bone)

Maximum Value 3.02 x10-5 mrad 1.43 x10-5 mrad 6.58 x10-2 mrem 3.35 x10-5 mrem 3.25 x10-1 mrem Unit 1 Compliance Status 10 CFR 50 Appendix I gamma air beta air whole body skin organ Unit 2:

Dose gamma air (1l beta air (2l whole body (3l skin (4l organ (5l (child-bone)

Yearly Objective 10.0 mrad 20.0 mrad 5.0 mrem 15.0 mrem 15.0 mrem Maximum Value

1. 77 x10-5 mrad 9.26 x1 o-e mrad 7.13 x10-2 mrem 2.00 x10-5 mrem 3.38 x10-1 mrem Unit 2 Compliance Status 10 CFR 50 Appendix I gamma air Yearly Objective beta air whole body skin organ 10.0 20.0 5.0 15.0 15.0 mrad mrad mrem mrem mrem

<1l Gamma Air Dose - GASPAR II, NUREG-0597 12l Beta Air Dose - GASPAR II, NUREG-0597 l3l Whole Body Dose - GASPAR II, NUREG-0597 14l Skin Dose - GASPAR II, NUREG-0597 l5l Inhalation and Food Pathways Dose - GASPAR II, NUREG-0597 Data recovery: 99.6%

E-1-6 Sector Affected North-Northwest North-Northwest North-Northwest North-Northwest North-Northwest

% of Appendix I 0.00 0.00 1.32 0.00 2.17 Sector Affected North-Northwest North-Northwest North-Northwest North-Northwest North-Northwest

% of Appendix I 0.00 0.00 1.43 0.00 2.25

APPENDIX F METEOROLOGICAL DAT A

Intentionally left blank

Byron Clean Energy Center Period of Record: January -

March 2023 Stability Class -

Extremely Unstable -

250Ft-30Ft Delta-T (F)

Winds Measured at 30 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 iJ-18 19-24

> 24 Total N

0 0

0 NNE 0

0 0

NE 0

0 0

ENE 0

0 0

E 0

0 0

ESE 0

0 0

SE 0

0 0

c; c; 1?

~~~

0 0

l 0

0 0

1 s

0 0

2 0

0 0

2 SSW 2

1 0

0 0

4 SW 0

0 0

vvsw l

0 0

0 1

w 0

1 0

0 0

0 WNW 0

0 2

1 0

0 3

NW 0

0 0

NNW 0

0 0

Variable 0

0 0

Total 2

3 6

1 0

0 12 Hours of calm in this stability class:

0 Hours of missing wind measurements in this stability class:

0 Hours of missing stability measurements in all stability classes:

19 F-1

Byron Clean Energy Center Period of Record: January -

March 2023 Stability Class - Moderately Unstable 250Ft-30Ft Delta-T (F)

Winds Measured at 30 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24

> 24 Total N

0 0

0 NNE 0

0 0

NE 0

0 0

ENE 0

0 0

E 0

0 0

ESE 0

0 0

SE 0

0 0

SSE 0

0 0

s 0

0 0

SSW 0

1 0

0 0

0 1

SW 0

0 0

WSW 0

0 0

w 0

0 0

1 0

0 1

WNW 0

0 0

1 0

0 1

NW 0

0 0

NNW 0

0 0

Variable 0

0 0

Total 0

1 0

2 0

0 3

Hours of calm in this stability class:

0 Hours of missing wind measurements in this stability class:

0 Hours of missing stability measurements in all stability classes:

19 F-2

Byron Clean Energy Center Period of Record: January -

March 2023 Stability Class -

Slightly Unstable -

250Ft-30Ft Delta-T (F)

Winds Measured at 30 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24

> 24 Total N

0 0

1 0

0 0

1 NNE 0

0 0

NE 0

0 0

ENE 0

0 1

0 0

0 1

E 0

0 0

ESE 0

0 0

SE 0

0 0

SSE 0

0 0

s 0

0 1

0 0

0 SSW 1

0 0

0 1

SW 1

0 2

0 0

0 3

(/JSW 0

0 2

1 0

0 3

w 0

0 1

4 1

0 6

WNW 0

0 1

1 3

0 5

_j_

NW 0

0 0

NNW 0

0 0

Variable 0

0 0

Total 2

0 9

6 4

0 21 Hours of calm in this stability class:

0 Hours of missing wind measurements in this stability class:

0 Hours of missing stability measurements in all stability classes:

19 F-3

Byron Clean Energy Center Period of Record: January -

March 2023 Stability Class - Neutral -

250Ft-30Ft Delta-T (F)

Winds Measured at 30 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24

> 24 Total N

8 19 50 23 0

0 100 NNE 3

11 11 8

0 0

33 NE 3

8 20 17 2

0 50 ENE 8

16 39 14 0

0 77 E

7 20 18 3

0 0

48 ESE 3

11 13 11 0

0 38 SE 2

10 7

15 0

0 34 SSE 3

10 26 18 0

0 57 s

6 9

23 9

0 0

47 SSW 2

12 8

12 0

0 34 SW 4

31 47 5

0 0

87 WSW 6

22 23 25 6

1 83 w

7 28 55 39 13 0

142 WNW 6

16 41 54 17 0

134 NW 4

22 44 17 0

0 87 NNW 1

31 62 24 0

0 118 Variable 0

0 0

Total 73 276 487 294 38 1

1169 Hours of calm in this stability class:

0 Hours of missing wind measurements in this stability class:

32 Hours of missing stability measurements in all stability classes:

19 F-4

Byron Clean Energy Center Period of Record: January -

March 2023 Stability Class - Slightly Stable -

250Ft-30Ft Delta-T (F)

Winds Measured at 30 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24

> 24 Total N

4 4

2 0

0 0

10 NNE 3

6 1

0 0

0 10 NE 1

12 6

1 0

0 20 ENE 3

10 32 9

0 0

54 J:'.,

2 34 18 2

0 0

56 ESE 4

10 9

9 0

0 32 SE 3

11 14 11 2

0 41 SSE 0

8 37 23 7

1 76 s

6 5

13 14 2

0 40 SSW 2

27 19 19 0

0 67 SW 2

27 28 9

1 0

67

[fJSW 12 17 15 6

3 4

57

\\AJ 3

30 28 14 3

1 79 WNW 5

26 9

0 0

0 40 NW 4

18 11 2

0 0

35 NNW 2

18 13 0

0 0

33 Variable 0

0 0

Total 56 263 255 119 18 6

717 Hours of calm in this stability class:

0 Hours of missing wind measurements in this stability class:

15 Hours of missing stability measurements in all stability classes:

19 F-5

Byron Clean Energy Center Period of Record: January -

March 2023 Stability Class - Moderately Stable -

250Ft-30Ft Delta-T (F)

Winds Measured at 30 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24

> 24 Total N

0 0

0 NNE 2

2 0

0 0

0 4

NE 1

0 0

0 l

ENE 2

l 0

0 0

0 3

E 0

6 2

0 0

0 8

ESE 0

8 5

0 0

0 13 SE 2

3 4

l 0

0 10 SSE 3

10 6

1 0

0 20 s

3 7

6 0

0 0

]_ 6 SSW 0

27 3

0 0

0 30 SV'l

]_

2

]_

0 0

0 4

WSW 4

3 0

0 0

0 7

[fJ 6

6 0

0 0

0 12 WNW 6

5 0

0 0

0 11 NW 3

1 0

0 0

0 4

NNW

]_

2 1

0 0

0 4

Variable 0

0 0

Total 34 83 28 2

0 0

147 Hours of calm in this stabil class:

0 Hours of missing wind measurements in this stability class:

0 Hours of missing stability measurements in all stability classes:

19 F-6

Byron Clean Energy Center Period of Record: January -

March 2023 Stability Class -

Extremely Stable -

250Ft-30Ft Delta-T (F)

Winds Measured at 30 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24

> 24 Total N

1 0

0 0

1 NNE 0

0 0

NE 0

0 0

ENE 2

1 0

0 0

0 3

E 0

1 0

0 0

0 1

ESE 0

2 1

0 0

0 3

SE 0

2 0

0 0

0 2

SSE 1

1 4

0 0

0 6

s 2

0 0

0 2

SSW 1

0 0

2 J_

Svsl 0

0 0

WS\\1-i 1

0 0

0 w

0 0

0 WNW 1

0 0

0 1

NW 0

0 0

NNW 2

1 0

0 0

0 3

Variable 0

0 0

Total 11 9

5 0

0 0

25 Hours of calm in this stability class:

0 Hours of missing wind measurements in this stability class:

0 Hours of missing stability mea.suremen ts lC all stability classes:

1 0

_j_-'

F-7

Byron Clean Energy Center Period of Record: January -

March 2023 Stability Class -

Extremely Unstable -

250Ft-30Ft Delta-T (F)

Winds Measured at 250 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24

> 24 Total N

0 0

0 NNE 0

0 0

NE 0

0 0

ENE 0

0 0

E 0

0 0

ESE 0

0 0

SE 0

0 0

SSE 0

0 0

s 0

0 0

3 0

0 3

SS\\1J 0

2 l

0 0

0 3

SW l

0 0

0 l

WSW 0

0 0

l"J l

l 0

0 0

0 2

WNW 0

0 1

2 0

0 3

NW 0

0 0

NNW 0

0 0

Variable 0

0 0

Total 2

3 2

5 0

0 12 Hours of calm in this stability class:

0 Hours of missing wind measurements in this stability class:

0 Hours of missing stability measurements in all stability classes:

19 F-8

Byron Clean Energy Center Period of Record: January -

March 2023 Stability Class -

Moderately Unstable -

250Ft-30Ft Delta-T (F)

Winds Measured at 250 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24

> 24 Tntal N

0 0

0 NNE 0

0 0

NE 0

0 0

ENE 0

0 0

E 0

0 0

ESE 0

0 0

SE 0

0 0

SSE 0

0 0

s 0

0 0

SSW 0

1 0

0 0

0 1

SW 0

0 0

WSW 0

0 0

w 0

0 0

1 0

0 1

WNW 0

0 0

0 1

NW 0

0 0

NNW 0

0 0

Variable 0

0 0

Total 0

1 0

1 1

0 3

Hours of calm in this stability class:

0 Hours of missing wind measurements in this stability class:

0 Hours of missing stability measurements in all stability classes:

19 F-9

Byron Clean Energy Center Period of Record: January -

March 2 023 Stability Class - Slightly Unstable -

250Ft-30Ft Delta-T (F)

Winds Measured at 250 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24

> 24 Total N

0 0

0 1

0 0

1 NNE 0

0 0

NE 0

0 0

ENE 0

0 0

1 0

0 1

E 0

0 0

ESE 0

0 0

SE 0

0 0

SSE 0

0 0

s 0

0 0

1 0

0 1

SSW 0

1 0

0 0

0 1

SW 0

l 1

l 0

0 3

WSW 0

0 1

3 0

0 4

w 0

0 3

1 1

6 WNW 0

0 0

0 4

NW 0

0 0

NNW 0

0 0

Variable 0

0 0

Total 0

2 3

10 5

1 21

_j_

Hours of calm in this stability class:

0 Hours of missing wind measurements in this stability class:

0 Hours of missing stability measurements in all stability classes:

19 F-10

Byron Clean Energy Center Period of Record: January -

March 2023 Stability Class -

Neutral -

250Ft-30Ft Delta-T (F)

Winds Measured at 250 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24

> 24

'T'otal N

2 8

34 38 12 0

94 NNE 2

15 8

12 8

1 46 NE 4

5 7

9 11 6

42 ENE 1

8 12 28 18 2

69 E

1 1

29 16 4

3 64 ESE 2

11 14 9

8 0

44 SE 0

9 3

10 8

0 30 SSE 2

11 10 17 21 3

64 s

2 7

12 15 7

1 44 SSW 1

5 8

8 10 1

33 SW 2

17 29 37 7

0 92 WSW 2

12 30 23 12 6

85 w

2 17 38 58 17 13 145 WNW 1

10 29 35 39 16 130 NW 2

12 27 36 10 0

87 NNW 2

10 56 44 13 0

125 Variable 0

0 0

Total 28 168 346 395 205 52 1194 Hours of calm in this stability class:

0 Hours of missing wind measurements in this stability class:

7 Hours of missing stability measurements in all stability classes:

19 F-11

Byron Clean Energy Center Period of Record: January -

March 2023 Stability Class -

Slightly Stable -

250Ft-30Ft Delta-T (F)

Winds Measured at 250 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24

> 24 Total N

0 4

8 5

0 0

17 NNE 0

3 7

3 0

0 13 NE 0

4 4

5 2

0 15 ENE 0

6 5

16 10 0

37 E

0 7

24 30 6

2 69 ESE 2

6 4

9 6

8 35 SE 0

4 6

10 6

6 32 SSE 0

0 6

9 24 17 56 s

0 3

l 17 31 11 63 SS'0J 3

1 3

17 24 8

56 SW 0

2 16 29 27 2

76

'v/SW G

l 17 26 8

6 58

'01 0

3 23 35 12 4

77 WNW 2

7 15 18 2

0 44 NW l

1 21 18 2

G 43 NNft/

0 5

10 19 1

0 35 Variable 0

0 0

Total 8

57 170 266 161 64 726 Hours of calm in this stability class:

0 Hours of missing wind measurements in this stability class:

6 Hours of missing stability measurements in all stability classes:

19 F-12

Byron Clean Energy Center Period of Record: January -

March 2023 Stability Class -

Moderately Stable -

250Ft-30Ft Delta-T (F)

Winds Measured at 250 Feet

\\ill ind Speed ( in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24

> 24 Total N

1 2

2 2

0 0

7 NNE 0

0 2

0 0

0 2

NE 0

0 2

0 0

0 2

ENE 0

l 0

0 0

0 l

E 0

3 1

2 0

0 6

J_

ESE 0

0 0

2 6

1 9

SE 0

1 4

3 4

0 12 SSE l

l l

1 6

l 11 s

0 0

3 4

6 0

13 SSW 0

0 3

4 5

0 12 S[l'J 0

0 1

25 4

0 30 WSW 0

1 1

5 l

0 8

\\J,J 0

l 3

6 0

0 10 WNW 0

0 3

4 0

0 7

NW 0

2 8

1 0

0 11 NNW 0

1 4

l 0

0 6

Variable 0

0 0

Total 2

13 38 60 32 2

147 Hours of calm in this stability class:

0 Hours of missing wind measurements in this stability class:

0 Hours of missing stability measurements in all stability classes:

19 F-13

Byron Clean Energy Center Period of Record: January -

March 2 023 Stability Class -

Extremely Stable -

250Ft-30Ft Delta-T (F)

Winds Measured at 250 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24

> 24 Total N

0 0

0 NNE 0

0 1

2 0

0 3

NE 1

0 0

0 1

ENE 0

0 0

E 0

0 0

1 ESE 0

1 0

2 3

0 6

SE 0

1 0

1 1

0 3

J..

SSE 0

0 0

s 0

0 0

2 3

0 CC J

SSW 0

0 1

0 0

0 1

J..

S\\rJ 0

0 1

0 0

0 1

WSW 0

0 1

1 0

0 2

w 0

0 0

WNW 0

0 0

NW 0

0 1

0 0

0 1

NNW 0

0 0

1 0

0 1

Variable 0

0 0

Total j_

2 6

9 7

0 25 Hours of calm in this stability class:

0 Hours of missing wind measurements in this stability class:

0 Hours of missing stability measurements in all stability classes:

19 F-14

Byron Clean Energy Center Period of Record: April -

June 2023 Stability Class -

Extremely Unstable -

250Ft-30Ft Delta-T (F)

Winds Measured at 30 Feet Wind Speed ( in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24

> 24 Total N

0 0

0 NNE 0

1 1

0 0

0 2

NE 0

1 0

0 0

0 1

_j_

ENE 0

0 0

E 0

0 3

0 0

0 3

ESE 0

0 0

SE 0

0 0

SSE 0

0 0

s 0

0 0

SSW 0

0 0

ST;iJ 0

0 0

vJSW 0

0 0

[JV 0

0 0

WNW 0

0 0

NW 0

0 0

NNW 0

0 0

Variable 0

0 0

Total 0

2 4

0 0

0 6

Hours of calm in this stability class:

0 Hours of miss wind measurements in this stability class:

0 Hours of missing stability measurements in all stability classes:

s F-15

Byron Clean Energy Center Period of Record: April -

June 2023 Stability Class -

Moderately Unstable -

250Ft-30Ft Delta-T (F)

Winds Measured at 30 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24

> 24 Total N

0 0

0 NNE 0

0 1

0 0

0 1

NE 0

0 2

0 0

0 2

ENE 0

0 6

0 0

0 6

E 0

1 7

1 0

0 9

J_

ESE 0

0 1

2 0

0 3

SE 0

0 0

SSE 0

0 1

1 0

0 2

s 0

0 0

SSW 0

0 0

S'07 0

1 0

0 0

0 1

WSW 0

1 0

0 0

0 1

[i'J 0

0 1

0 0

0 1

WNW 0

0 0

NW 0

0 1

0 0

0 1

NNW 0

0 0

Variable 0

0 0

Hours of calm in this stabili class:

0 Hours of missing wind measurements in this stability class:

0 Hours of missing stability measurements in all stability classes:

5 F-16

Byron Clean Energy Center Period of Record: April -

June 2023 Stability Class - Slightly Unstable -

250Ft-30Ft Delta-T (F)

Winds Measured at 30 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24

> 24 Total N

0 2

2 0

0 0

4 NNE 0

0 0

3 0

0 3

NE 0

1 2

1 0

0 4

ENE 0

1 9

0 0

0 10 E

0 5

15 0

0 0

20 ESE 0

2 0

0 0

0 2

SE 0

1 0

0 0

0 1

SSE 0

0 l

3 0

0 4

s 0

1 1

0 0

0 2

SSW 0

1 l

0 0

3 SW 0

3 0

0 0

8 WSW 0

1 1

0 0

0 2

w 0

2 1

3 0

0 6

WNW 0

1 3

0 0

0 4

NW 0

0 0

NNW 0

0 3

0 0

0 3

Variable 0

0 0

Total 0

23 42 11 0

0 76 Hours of calm in this stability class:

0 Hours of missing wind measurements in this stability class:

0 Hours of missing stability measurements in all stability classes:

5 F-17

Byron Clean Energy Center Period of Record: April -

June 2023 Stability Class -

Neutral -

250Ft-30Ft Delta-T (F) vhnds Measured at 30 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24

> 24 Total N

2 19 26 4

0 0

51 NNE 0

28 32 2

0 0

62 NE 2

23 18 10 0

0 53 ENE 2

22 34 7

0 0

65 E

2 30 36 2

0 0

70 ESE 2

15 9

1 1

0 28 SE 0

13 20 5

0 0

38 SSE 0

11 39 12 3

0 65 s

0 14 32 13 2

0 61 SSW 4

7 16 4

0 0

31 SW 1

12 17 10 0

0 40 WSW 0

11 3

20 8

0 42 v\\)

3 17 9

21 13 0

63 WNW 4

13 36 38 10 0

101 NW 2

24 21 21 15 0

83 NNW 4

18 15 6

2 0

45 Variable 0

0 0

Total 28 277 3 63 176 54 0

898 Hours of calm in this stability class:

0 Hours of missing wind measurements in this stability class:

0 Hours of missing stability measurements in all stability classes:

5 F-18

Byron Clean Energy Center Period of Record: April -

June 2023 Stability Class -

Sl y Stable -

250Ft-30Ft Delta-T (F)

Winds Measured at 30 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24

> 24 Tota *1 N

6 13 5

0 0

0 24 NNE 3

14 7

0 0

0 24 NE 4

l 4 23 10 0

0 51 ENE 10 28 47 9

0 0

94 E

7 47 9

0 1

0 64 ESE 3

10 16 3

l l

34 SE 0

20 18 1

0 0

39 SSE 4

11 37 4

2 l

59 s

6 7

] 9 5

0 0

37 SSW 5

10 7

2 0

0 24 sr;v 4

19 13 1

0 0

37 vlSW 5

10 6

3 2

0 26 w

6 15 29 6

0 0

56 WNW 7

23 14 5

0 0

49 NW 3

16 13 17 0

0 49 NNW 4

19 13 3

0 0

39 Variable 0

0 0

Total 77 276 276 69 6

2 706 Hours of calm in this stability class:

0 Hours of missing wind measurements in this stability class:

0 Hours of missing stability measurements in all stability classes:

5 F-19

Byron Clean Energy Center Period of Record: April -

June 2023 Stability Class -

Moderately Stable -

250Ft-30Ft Delta-T (F)

Winds Measured at 30 Feet Wind Speed ( in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24

> 24 Total N

1 2

0 0

3 NNE 4

3 0

0 0

0 7

NE 2

0 0

0 2

ENE 4

17 5

0 0

0 26 E

8 35 3

0 0

0 46 ESE 1

31 20 0

0 0

52 SE 2

35 8

1 0

0 46 SSE 4

30 31 0

0 0

65 s

2 13 4

0 0

0 19 SS\\"J 6

9 1

0 0

0 16 Sv1 4

3 0

1 0

0 8

WSW 2

0 0

0 2

[fJ 6

2 0

0 0

0 8

WNW 7

1 0

0 0

0 8

NW 5

6 0

0 0

0 11 NNW 4

3 0

0 0

0 7

Variable 0

0 0

Total 62 190 72 2

0 0

32 6 Hours of calm in this stability class:

3 Hours of missing wind measurements in this stability class:

0 Hours of miss stability measurements in all stability classes:

5 F-20

Byron Clean Energy Center Period of Record: April -

June 2023 Stability Class -

Extremely Stable -

250Ft-30Ft Delta-T (F)

Winds Measured at 30 Feet Wind Speed ( in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24

> 24 Total N

r-,)

0 0

0 5

NNE 1

0 0

0 1

NE 2

1 0

0 0

0 3

ENE 6

1 0

0 0

0 7

E 5

12 0

0 0

0 17 ESE 6

10 8

0 0

0 24 SE 2

9 2

0 0

0 13 SSE 2

2 1

0 0

0 5

s 2

1 0

0 0

0 3

SSW 7

2 0

0 0

0 9

Sv1i 8

0 0

0 8

[J1/Sv1/

6 0

0 0

6 w

8 0

0 0

8 v,JNW 11 1

0 0

12 NW 8

0 0

0 8

NNW 4

0 0

0 4

Variable 0

0 0

Total 83 39 11 0

0 0

133 Hours of calm in this stability class:

4 Hours of missing wind measurements in this stability class:

0 Hours of missing stability measurements in all stability classes:

5 F-21

Byron Clean Energy Center Period of Record: April -

June 2023 Stability Class -

Extremely Unstable -

250Ft-30Ft Delta-T (F)

Winds Measured at 250 Feet Wind Speed ( in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24

> 24 Total N

0 0

0 NNE 0

0 1

1 0

0 2

NE 0

0 1

0 0

0 1

ENE 0

0 0

1:c 0

0 2

0 0

0 2

ESE 0

0 0

1 0

0 1

SE 0

0 0

sss 0

0 0

s 0

0 0

SSW 0

0 0

SW 0

0 0

vvsw 0

0 0

[fl 0

0 0

WNW 0

0 0

NW 0

0 0

NNW 0

0 0

Variable 0

0 0

Total 0

0 4

2 0

0 6

Hours of calm in this stability class:

0 Hours of missing wind measurements in this stability class:

0 Hours of missing stability measurements in all stability classes:

5 F-22

Byron Clean Energy Center Period of Record: April -

June 2023 Stability Class - Moderately Unstable -

250Ft-30Ft Delta-T (F)

Winds Measured at 250 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24

> 24 Total N

0 0

0 NNE 0

0 0

l 0

0 l

NE 0

0 0

2 0

0 2

ENE 0

0 l

2 0

0 3

E 0

0 10 1

0 0

11 J_

ESE 0

0 l

3 0

0 4

SE 0

0 0

SSE 0

0 l

l 0

0 2

s 0

0 0

SSliJ 0

0 0

Sv\\J 0

0 l

0 0

0 l

WSW 0

0 l

0 0

0 l

w 0

0 0

l 0

0 1

WNW 0

0 0

NW 0

0 0

l 0

0 1

NNW 0

0 0

Variable 0

0 0

Total 0

0 15 12 0

0 27 Hours of calm in this stability class:

0 Hours of missing wind measurements in this stability class:

0 Hours of missing stability measurements in all stability classes:

J F-23

Byron Clean Energy Center Period of Record: April -

June 2023 Stability Class -

Slightly Unstable -

250Ft-30Ft Delta-T (F)

Winds Measured at 250 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24

> 24 Total N

0 2

2 0

0 0

4 NNE 0

0 0

NE 0

0 0

3 0

0 3

ENE 0

0 7

cc 0

0 12 J

E 0

2 15 3

0 0

20 ESE 0

1 2

l 0

0 4

SE 0

l 0

0 0

0 1

SSE Cl 0

1 3

Cl Cl 4

s 0

Cl 1

0 Cl 0

1 SSW Cl Cl 2

1 Cl Cl 3

SW Cl 8

Cl Cl 0

9 WSW Cl 1

0 1

0 Cl 2

[fJ 0

1 1

4 0

0 6

WNW 0

0 2

Cl Cl 0

2 NW Cl 1

1 Cl 0

Cl 2

NNW Cl 0

2 1

0 Cl 3

Variable 0

Cl 0

Cl Cl Cl 0

Total 0

10 44 22 0

0 76 Hours of calm in this stability class:

Cl Hours of missing wind measurements in this stability class:

0 Hours of missing stability measurements in all stability classes:

5 F-24

Byron Clean Energy Center Period of Record: April -

June 2023 Stability Class -

Neutral -

250Ft-30Ft Delta-T (F)

Winds Measured at 250 Feet Wind Speed ( in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24

> 24 Total N

1 12 22 7

1 0

43 NNE 2

14 23 11 2

0 52 NE l

20 21 19 9

0 70 ENE 0

13 17 14 6

0 so E

2 20 38 25 6

0 91 ESE 1

12 11 l

1 1

27 SE 0

7 15 6

5 0

33 SSE 0

3 28 24 8

3 66 s

2 10 20 28 2

2 64 SSW 1

9 8

13 0

32 j_

SW 2

7 14 11 6

41 WSW

.L 7

5 6

17 6

42 w

2 13 11 9

19 10 64 WNW 1

6 26 30 18 9

90 NW 4

12 19 24 15 14 88 NNW 2

17 14 5

s 2

45 Variable 0

0 0

Total 22 182 2 92 233 121 48 898 Hours of calm.1 n this stability class:

0 Hours of missing wind measurements in this stability class:

0 Hours of missing stability measurements in all stability classes:

5 F-25

Byron Clean Energy Center Period of Record:

l June 2023 Stability Class - Slightly Stable -

250Ft-30Ft Delta-T (F)

Winds Measured at 250 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24

> 24 Total N

1 5

4 9

0 0

19 NNE 1

1 9

10 0

0 21 NE 1

6 11 18 9

0 45 ENE 1

5 19 37 20 3

85 E

2 17 27 33 2

2 83 ESE 2

4 4

21 7

3 41 SE 1

1 9

15 7

0 33 SSE 1

0 3

31 9

7 51 s

1 1

3 20 16 42 SSW 0

3 C

10 4

0 22 s)

SW 1

6 12 12 16 0

47 WSW 0

5 11 2

3 2

23

[fl 2

4 15 33 3

0 57 WNW 1

3 14 13 5

0 36 NW 0

3 17 19 15 0

54 NNW 2

4 14 24 3

0 47 Variable 0

0 0

Hours of calm in this stability class:

0 Hours of missing wind measurements in this stability class:

0 Hours of missing stability measurements in all stability classes:

5 F-26

Byron Clean Energy Center Period of Record: April -

June 2023 Stability Class -

Moderately Stable -

250Ft-30Ft Delta-T (F)

Winds Measured at 250 Feet V'Jind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24

> 24 Totrll N

1 0

6 1

0 0

8 NNE 0

3 0

2 0

0 5

NE 0

0 1

0 0

0

_j_

ENE 0

2 1

1 1

0 s

E 10 24 22 0

0 57 ESE 0

2 4

23 7

1 37 SE 0

3 6

41 6

1 57 SSE 0

0 7

18 20 2

47 s

0 2

0 15 24 0

41 SSv7 0

0 2

12 2

0 16 SW 0

0 1

11 2

0 1 4 WSlt/

0 3

1 l

0 1

6 w

0 2

6 4

0 0

12

\\/JN[;,J 1

1 4

0 0

0 6

NW 0

2 3

1 0

0 6

NN\\/J l

l 7

2 0

0 11 Variable 0

0 0

Total 4

31 73 154 62 5

32 9 Hours of calm in this stability class:

0 Hours of missing wind measurements in this stability class:

0 Hours of missing stability measurements in all stability classes:

5 F-27

Byron Clean Energy Center Period of Record: April -

June 2023 Stability Class -

Extremely Stable -

250Ft-30Ft Delta-T (F)

Winds Measured at 250 Feet Wind Speed ( in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24

> 24 Total N

0 0

0 NNE l

1 l

1 0

0 4

NE 1

0 0

1 0

0 2

ENE 0

7 2

0 0

0 9

E 2

4 6

0 0

0 12 ESE 0

0 1

13 1

0 15 SE 1

3 6

6 9

0 25 SSE 0

2 4

2 0

9 s

2 4

5 2

1 0

14 SSW 1

0 2

5 0

0 8

SW 0

0 0

WSW 0

0 1

3 0

0 4

J_

V'J 0

3 3

9 0

0 15 WNW 0

1 2

3 0

0 6

NW 0

2 4

3 0

0 9

NNW 0

4 0

1 0

0 s

Variable 0

0 0

Total 8

31 37 48 13 0

137 Hours of calm in this stability class:

0 Hours of missing wind measurements in this stability class:

0 Hours of missing stability measurements in all stability classes:

s F-28

Byron Clean Energy Center Period of Record: July -

September 2023 Stability Class -

Extremely Unstable -

250Ft-30Ft Delta-T (F)

Winds Measured at 30 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24

> 24 Total N

1 1

0 0

2 NNE 0

0 0

NE 0

0 0

ENE 0

0 0

E 0

0 0

ESE 0

0 0

SE 0

0 0

SSE 0

0 0

s 0

0 0

SSv'J 0

0 0

SW 0

0 2

1 0

0 3

WSW 0

0 0

ftJ 0

4 2

0 0

0 6

WNW 1

2 0

0 0

0 3

NW 0

2 0

0 0

0 2

NNW 0

0 0

Variable 0

0 0

Total 2

9 4

1 0

0 16 Hours of calm in this stabil y class:

0 Hours of missing wind measurements in this stability class:

0 Hours of missing stability measurements in all stability classes:

3 F-29

Byron Clean Energy Center Period of Record: July -

September 2023 Stability Class -

Moderately Unstable -

250Ft-30Ft Delta-T (F)

Winds Measured at 30 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24

> 24 Total N

0 0

0 NNE 0

0 0

NE 0

0 0

ENE 0

l 0

0 0

0 1

E 0

0 2

0 0

0 2

ESE 0

0 0

SE 0

0 0

SSE 0

0 0

1 0

0 1

s 0

0 l

1 0

0 2

SSW 0

0 5

0 0

0 5

S'ill 0

0 4

1 0

0 5

WSv'J 0

0 2

0 0

0 2

w 0

l 0

0 0

0 1

WNW 0

0 0

1 0

0 1

NW 0

1 1

0 0

0 2

NNW l

0 l

0 0

0 2

Variable 0

0 0

Total 1

3 16 4

0 0

24 Hours of calm in this stability class:

0 Hours of missing wind measurements in this stability class:

0 Hours of missing stability measurements in all stability classes:

3 F-30

Byron Clean Energy Center Period of Record: July -

September 2023 Stability Class - Slightly Unstable -

250Ft-30Ft Delta-T (F)

Winds Measured at 30 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24

> 24 Total N

l 4

1 0

0 0

6 NNE 0

2 1

0 0

0 3

NE 1

0 1

0 0

0 2

ENE 0

0 0

E 0

2 0

0 0

0 2

ESE 0

0 2

0 0

0 2

SE 0

0 0

SSE 0

1 1

0 0

0 2

s 0

l 6

0 0

0 7

SSW 1

1 1

0 0

0 3

SW 0

1 9

0 0

0 10 wsi11J 0

1 7

5 0

0 13 w

0 2

2 1

0 0

5 WNW 0

0 3

2 0

0 5

NW 0

1 1

1 0

0 3

NNW 1

1 5

0 0

0 7

Variable 0

0 0

Total 4

17 40 9

0 0

70 Hours of calm in this stability class:

0 Hours of missing wind measurements in this stability class:

0 Hours of missing stability measurements in all stability classes:

3 F-31

Byron Clean Energy Center Period of Record: July -

September 2023 Stability Class - Neutral -

250Ft-30Ft Delta-T (F)

Winds Measured at 30 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24

> 24 Total N

3 48 33 0

0 0

84 NNE 2

18 9

0 0

0 29 NE 3

9 7

0 0

0 19 ENE 6

19 5

0 0

0 30 E

3 25 11 0

0 0

39 ESE 2

18 12 0

0 0

32 SE 4

27 31 0

0 63 SSE 1

26 37 6

0 0

70 s

2 30 27 4

0 0

63 SSW 3

32 11 2

0 0

48 SW 3

32 22 0

0 0

57

\\'/SW 3

28 30 s

0 0

66 w

5 26 26 4

0 0

61 WNW 7

23 29 7

0 0

66 NW 4

42 19 8

0 0

73 NNW 8

48 37 2

0 0

95 Variable 0

0 0

Total 59 451 346 39 0

0 895 Hours of calm in this stabil class:

0 Hours of missing wind measurements in this stability class:

0 Hours of missing stability measurements in all stability classes:

3 F-32

Byron Clean Energy Center Period of Record: July -

September 2023 Stability Class - Slightly Stable -

250Ft-30Ft Delta-T (F)

Winds Measured at 30 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24

> 24 Total N

9 17 4

0 0

0 30 NNE 5

13 5

0 0

0 23 NE 8

10 10 0

0 0

28 ENE 9

22 13 1

0 0

45 E

14 69 11 0

0 0

94 ESE 23 32 0

0 0

62 I

SE 5

25 21 0

0 0

51 SSE 6

28 18 0

0 0

52 s

12 23 9

0 0

0 44 SSW 7

29 7

4 0

0 47 Slli 15 22 11 0

0 0

48 WSvJ l 0 16 5

0 0

0 31 vii 11 11 3

0 0

0 25 WNW 10 14 2

2 0

0 28 Nf11J 13 35 2

0 0

0 50 NNW 5

31 4

0 0

0 40 Variable 0

0 0

Total 146 388 157 7

0 0

698 Hours of calm in this stability class:

0 Hours of missing wind measurements in this stability class:

0 Hours of missing stability measurements in all stability classes:

3 F-33

Byron Clean Energy Center Period of Record: July -

September 2023 Stability Class - Moderately Stable -

250Ft-30Ft Delta-T (F)

Winds Measured at 30 Feet Wind Speed ( in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24

> 24 Total N

2 2

1 0

0 0

5 NNE 1

1 0

0 0

0 2

NE 1

0 1

0 0

0 2

ENE 6

0 0

0 6

E 1

26 2

0 0

0 29 ESE 7

22 8

0 0

0 37 SE 6

30 4

0 0

0 40 SSE 13 37 5

0 0

0 55 s

14 25 1

0 0

0 40 SSW 1 C

~J 15 0

0 0

0 30 SW 19 4

0 0

23 WSW 7

2 0

0 0

0 9

w 16 5

0 0

21 WNW 12 3

0 0

15 NW 6

7 0

0 0

0 13 NNW 3

7 0

0 0

0 10 Variable 0

0 0

Total 129 186 22 0

0 0

337 Hours of calm in this stability class:

3 Hours of missing wind measurements in this stability class:

0 Hours of missing stability measurements in all stability classes:

3 F-34

Byron Clean Energy Center Period of Record: July -

September 2023 Stability Class -

Extreme Stable -

250Ft-30Ft Delta-T (F)

Winds Measured at 30 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24

> 24 Total N

0 0

0 NNE 0

0 0

NE 2

0 0

0 2

ENE 0

0 0

E 3

5 0

0 0

0 8

ESE 6

9 3

0 0

0 18 SE 3

6 2

0 0

0 11 SSE 2

16 2

0 0

0 20 s

14 7

0 0

21 SSW 13 1

0 0

14 SW 9

0 0

0 9

WSW 12 0

0 0

12

\\f\\J 16 0

0 0

16 WNW 15 0

0 0

15 NW 6

1 0

0 0

0 7

NNW 3

0 0

0 3

Variable 0

0 0

Total 104 45 7

0 0

0 156 Hours of calm in this stability class:

6 Hours of missing wind measurements in this stability class:

0 Hours of missing stability measurements in all stability classes:

3 F-35

Byron Clean Energy Center Period of Record: July -

September 2023 Stability Class -

Extremely Unstable -

250Ft-30Ft Delta-T (F)

Winds Measured at 250 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24

> 24 Total N

0 l

0 0

l NNE l

0 0

0 l

NE 0

0 0

ENE 0

0 0

E 0

0 0

ESE 0

0 0

SE 0

0 0

C 0

SSE 0

0 0

C 0

0 0

s 0

0 0

SSW 0

0 0

0 (0

cl SW 0

0 0

2 l

0 3

V'JSW 0

0 0

[fl 0

l 2

l 0

0 4

li'lNW 0

0 3

0 0

0 3

NW 0

2 2

0 0

0 4

NNW 0

0 0

Variable 0

0 0

Total l

4 7

3 1

0 16 Hours of calm in this stability class:

0 Hours of missing wind measurements in this stability class:

0 Hours of missing stability measurements l n all stability classes:

3 F-36

Byron Clean Energy Center Period of Record: July -

September 2023 Stability Class -

Moderately Unstable -

250Ft-30Ft Delta-T (F)

Winds Measured at 250 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24

> 24 Total N

0 0

0 NNE 0

0 0

NE 0

0 0

ENE 0

0 1

0 0

0 1

E 0

0 l

0 0

0 1

ESE 0

0 0

1 0

0 1

SE 0

0 0

SSE 0

0 0

0 1

s 0

0 0

0 1

SSW 0

0 3

2 0

0 s

SvJ 0

0 1

s 0

0 6

WSW 0

0 0

2 0

0 2

w 0

0 1

0 0

0 1

WNW 0

0 0

0 1

NW 0

1 0

0 0

2 NNW 1

0 0

1 0

0 2

Variable 0

0 0

Total 1

1 7

12 3

0 24 Hours of calm in this stability class:

0 Hours of missing wind measurements in this stability class:

0 Hours of missing stability measurements in all s t:abili ty classes:

3 F-37

Byron Clean Energy Center Period of Record: July -

September 2023 Stability Class - Slightly Unstable -

250Ft-30Ft Delta-T (F)

Winds Measured at 250 Feet Wind Speed ( in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24

> 24 Total N

0 3

l 0

0 0

4 NNE 1

2 1

1 0

0 5

NE 0

0 1

1 0

0 2

ENE 0

0 0

E 1

0 l

0 0

0 2

ESE 0

0 1

0 0

0 1

SE 0

1 0

2 0

0 3

SSE 0

0 1

0 0

0 l

s 0

0 3

4 0

0 7

SSW 1

0 2

0 0

0 3

SW 0

0 6

5 0

0 11 WSW 0

2 1

9 1

0 13

'0) 0 1

2 2

0 0

C s_)

li'JNW 0

0 2

l 2

0 5

NW 0

0 0

1 1

0 2

NNW 0

0 4

2 0

0 6

Variable 0

0 0

Total 3

9 26 28 4

0 70 Hours of calm in this stability class:

0 Hours of missing wind measurements in this stability class:

0 Hours of missing stability measurements in all stability classes:

3 F-38

Byron Clean Energy Center Period of Record: July -

September 2023 Stability Class -

Neutral -

250Ft-30Ft Delta-T (F)

Winds Measured at 250 Feet ii/ind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24

> 24 Total N

5 32 48 9

1 0

95 NNE 0

16 23 8

0 0

47 NE 2

7 8

7 0

0 24 ENE 1

8 11 0

0 0

20 E

1 11 29 0

0 0

41 ESE l

10 25 5

0 0

41 SE 3

6 24 21 2

0 56 SSE 2

12 31 20 5

0 0

s 0

10 30 17 l

0 58 SSW 3

19 25 9

1 0

57 SW 0

22 13 14 1

0 50 WSW 3

22 19 20 0

0 64

!iv 1

21 25 19 0

0 66 WNW 3

17 18 14 3

0 55 NW 2

25 22 7

11 0

67 NNW 1

22 41 19 1

0 84 Variable 0

0 0

Total 28 260 392 189 26 0

895 Hours of calm in this stability class:

0 Hours of missing wind measurements in this stability class:

0 Hours of missing stability measurements in all stability classes:

3 F-39

Byron Clean Energy Center Period of Record: July -

September 2023 Stability Class -

Slightly Stable -

250Ft-30Ft Delta-T (F)

Winds Measured at 250 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24

> 24 Total N

3 8

18 6

1 0

36 NNE 3

11 12 8

2 0

36 NE 2

8 9

10 0

0 29 ENE 3

14 14 9

4 0

44 E

2 13 50 24 3

0 92 ESE 0

8 12 14 17 0

51 SE l

4 6

23 7

0 41 SSE 0

3 4

34 4

0 45 s

2 5

17 20 6

0 50 SSW 2

4 15 23 6

0 50 si,1 3

8 16 26 8

0 61 WSW 2

6 14 14 1

0 37 w

0 9

12 3

0 0

24 WNv,J 4

9 9

4 1

l 28 NW 2

10 16 2

0 0

30 NN!i\\J l

7 20 16 0

0 44 Variable 0

0 0

Total 30 127 244 236 60 1

698 Hours of calm in this stability class:

0 Hours of missing wind measurements in this stability class:

0 Hours of missing stability measurements in all stability classes:

3 F-40

Byron Clean Energy Center Period of Record:,July -

September 2023 Stability Class -

Moderately Stable -

250Ft-30Ft Delta-T (F)

Winds Measured at 250 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24

> 24 Total N

0 2

6 7

0 0

15 NNE 2

1 3

0 0

0 6

NE 0

2 1

2 0

0 5

ENE 2

1 1

0 0

0 4

E 0

3 9

8 0

0 20 ESE 0

3 5

7 8

0 23 SE 0

7 3

8 12 1

31 SSE 1

5 11 15 6

1 39 s

0 3

11 26 6

1 47 SSW 0

2 10 25 2

0 39 STtJ 1

2 9

8 0

0 20 v'JSW 0

3 9

12 0

0 24 V'J 0

5 13 5

0 0

23 WNftJ 1

2 7

2 0

0 12 NW 0

1 14 5

0 0

20 NNW 0

3 8

1 0

0 12 Variable 0

0 0

Total 7

45 120 131 34 3

340 Hours of calm in this stability class:

0 Hours of missing wind measurements in this stability class:

0 Hours of missing stability measurements in all stability classes:

3 F-41

Byron Clean Energy Center Period of Record: July -

September 2023 Stability Class -

Extremely Stable -

250Ft-30Ft Delta-T (F)

Winds Measured at 250 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24

> 24 Total N

1 2

2 1

0 0

6 NNE 1

0 2

0 0

0 3

NE 0

l 0

0 0

0 1

ENE 0

3 2

0 0

0 5

E 2

0 0

0 2

ESE 0

2 2

4 0

9 SE 0

1 6

7 3

0 17 SSE 0

3 5

6 8

0 22 s

0 3

9 2

c:;

0 19 J

SSW 0

C) 12 5

0 0

17 Sv1i 0

0 2

3 0

0 5

WSW 0

l 1

3 0

0 5

w 0

2 3

4 0

0 9

WNW

~

5 5

2 0

0 13 NW 0

2 10 3

0 0

15 NNW 1

4 9

0 0

0 14 Variable 0

0 0

Total 6

29 70 40 17 0

162 Hours of calm in this stability class:

0 Hours of missing wind measurements in this stability class:

0 Hours of missing stability measurements in all stability classes:

3 F-42

Byron Clean Energy Center Period of Record: October -

December 2023 Stability Class -

Extremely Unstable -

250Ft-30Ft Delta-T (F)

Winds Measured at 30 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24

> 24 Total N

0 0

0 NNE 0

0 0

NE 0

0 0

ENE 0

0 0

E 1

2 0

0 0

0 3

ESE 0

8 0

0 0

0 8

SE 0

2 11 4

0 0

17 SSE 0

5 1

0 0

0 6

s 0

0 0

SSW 0

0 0

S'ii'J 0

0 2

0 0

0 2

WSW 0

0 1

0 0

0 1

w 0

0 1

0 0

0 1

WNW 0

0 1

0 0

0 1

NW 0

0 0

NNW 0

0 8

0 0

0 8

Variable 0

0 0

Total 1

17 25 4

0 0

47 Hours of calm in this stability class:

0 Hours of missing 1dind measurements in this stability class:

0 Hours of missing stability measurements in all stability classes:

0 F-43

Byron Clean Energy Center Period of Record: October -

December 2023 Stabil Class -

Moderately Unstable -

250Ft-30Ft Delta-T (F)

Winds Measured at 30 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24

> 24 Totrll N

0 0

0 NNE 0

0 0

NE 0

0 0

ENE 0

0 0

E 0

1 0

0 0

0 1

ESE 0

1 0

0 0

0 1

SE 0

0 0

SSE 0

0 0

s 0

0 0

SSv"J 0

2 1

0 0

0 3

S\\rJ 0

1 2

1 0

0 4

WS\\rJ 0

0 0

1 0

0 1

1i'J 0

0 6

0 0

0 6

v'JN\\rJ 0

0 0

NW 0

0 0

NNW 0

0 3

0 0

0 3

Variable 0

0 0

Total 0

5 12 2

0 0

19 Hours of calm in this stability class:

0 Hours of missing wind measurements in this stability class:

0 Hours of missing stability measurements in all stability classes:

0 F-44

Byron Clean Energy Center Period of Record: October -

December 2023 Stabil Class -

Slightly Unstable -

250Ft-30Ft Delta-T (F)

Winds Measured at 30 Feet Wind Speed (in mph) vi/ind Direction 1-3 4-7 8-12 13-18 19-24

> 24 Total N

0 2

0 0

2 NNE 0

1 0

0 0

0 NE 0

0 1

1 0

0 2

ENE 0

0 0

E 0

2 1

0 0

0 3

ESE 0

0 0

SE 0

0 0

1 0

0 1

SSE 0

0 0

s 0

0 2

0 0

0 2

SSW 0

1 0

0 0

0 1

SW 0

0 0

WSW 0

0 1

0 0

0 1

l'J 0

1 1

0 0

0 2

WNW 0

0 5

3 0

0 8

NW 0

0 1

0 0

0 1

NNW 0

1 5

0 0

0 6

Variable 0

0 0

Total 0

8 17 5

0 0

30 Hours of calm in this stability class:

0 Hours of missing wind measurements in this stability class:

0 Hours of missing stability measurements in all stability classes:

0 F-45

Byron Clean Energy Center Period of Record: October -

December 2023 Stability Class -

Neutral -

250Ft-30Ft Delta-T (F) li'Tinds Measured at 30 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24

> ?4 Total N

0 9

59 5

0 0

73 NNE 0

8 17 2

0 0

27 NE 0

8 6

3 0

0 17 ENE 1

12 18 3

0 0

34 E

9 27 21 0

0 0

57 ESE 1

7 2

4 5

0 19 SE l

1 0 9

3 0

0 23 SSE 3

17 14 10 0

0 44 s

1 21 48 15 0

0 85 SSW 4

19 41 12 0

0 76 SW 3

28 43 5

0 0

79 li'JSW 4

26 26 19 3

0 78

\\fJ 2

12 31 46 4

0 95 WNW 4

11 47 27 0

0 89 NW 1

17 45 29 3

0 95 NNW 1

23 64 13 3

0 104 Variable 0

0 0

Total 35 255 4 91 196 18 0

995 Hours of calm in this stability class:

0 Hours of missing wind measurements in this stability class:

0 Hours of miss stability measurements in all stability classes:

0 F-46

Byron Clean Energy Center Period of Record: October -

December 2023 Stability Class -

Slightly Stable -

250Ft-30Ft Delta-T (F)

Winds Measured at 30 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-?4

> 24 Total N

2 19 14 0

0 0

35 NNE 0

6 6

1 0

0 13 NE 2

s 4

0 0

0 11 ENE 1

4 1 4 2

0 0

21 E

0 26 34 2

0 0

62 ESE 0

10 7

5 3

0 25 SE 1

31 15 3

0 0

so SSE 2

23 33 8

0 0

66 s

4 27 45 7

0 0

83 SSW 3

24 37 16 0

0 80 SW s

23 13 4

0 0

45 WSW 6

8 13 1

0 0

28

10) 10 30 20 10 0

0 70 WNW 8

38 25 3

0 0

74 NW 6

32 18 1

0 0

57 NNW 8

25 10 2

0 0

45 Variable 0

0 0

Total 58 331 308 65 3

0 765 Hours of calm in this stability class:

0 Hours of missing wind measurements in this stability class:

0 Hours of missing stability measurements in all stability classes:

0 F-47

Byron Clean Energy Center Period of Record: October -

December 2023 Stability Class -

Moderately Stable -

250Ft-30Ft Delta-T (F) lf\\Jinds Measured at 30 Feet Wind Speed (in mph)

[/\\)ind Direction 1-3 4-7 8-12 13 18 19-24

> ?4 Total N

2 1

0 0

3 NNE 0

0 0

NE 0

0 0

ENE 0

1 5

0 0

0 6

E 0

10 0

0 0

0 10 ESE 1

5 0

0 0

0 6

SE 1

12 4

0 0

0 17 SSE 1

21 10 3

0 0

35 s

5 9

9 0

0 0

23 SS\\IJ 6

13 2

0 0

0 21 S\\l'I 3

6 0

0 0

0 9

wsv,J 10 3

0 0

13 w

20 11 0

0 0

0 31 WNW 9

4 0

0 0

0 13 NW 15 0

0 0

15 NNW 6

1 0

0 0

0 7

Variable 0

0 0

Total 79 97 30 3

0 0

209 Hours of calm in this stability class:

0 Hours of missing wind measurements in this stability class:

0 Hours of missing stability measurements in all stability classes:

0 F-48

Byron Clean Energy Center Period of Record: October -

December 2023 Stability Class -

Extremely Stable -

250Ft-30Ft Delta-T (F)

Winds Measured at 30 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24

> 24 Total N

0 0

0 NNE 0

0 0

NE 1

0 0

0 1

ENE 0

0 0

E 1

0 0

0 1

ESE 1

l_

0 0

2 SE 4

26 3

0 0

0 33 SSE 8

15 7

0 0

0 30 s

4 14 4

0 0

0 22 SSW 10 6

0 0

16 SV-1 r:

0 0

G 0

0 5

._J WSW 1S 0

0 0

15 w

10 0

0 0

10

'illNW 3

0 0

0 3

NW 5

0 0

0 s

NNW 0

0 0

Variable 0

0 0

Total 67 62 14 0

0 0

143 Hours of calm in this stability class:

0 Hours of missing wind measurements in this stability class:

0 Hours of missing stability measurements in all stability classes:

0 F-49

Byron Clean Energy Center Period of Record: October -

December 2023 Stability Class -

Extremely Unstable -

250Ft-30Ft Delta-T (F)

Winds Measured at 250 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24

> 24 Total N

0 0

0 8

0 0

8 NNE 0

0 0

NE 0

0 0

ENE 0

0 0

E 0

0 0

ESE 0

2 4

0 0

0 6

SE 0

1 4

8 4

1 18 SSE 0

0 7

3 0

0 10 s

0 0

0 C

0 SSW 0

0 0

ST/7 0

0 0

2 0

0 2

WSW 0

0 0

w 0

0 1

1 0

0 2

v,JNW 0

0 1

0 0

0 1

NW 0

0 0

NNW 0

0 0

Variable 0

0 0

Total 0

3 17 22 4

1 47 Hours of calm in this stability class:

0 Hours of missing wind measurements in this stability class:

0 Hours of missing stability meas'.lrements in all stability classes:

0 F-50

Byron Clean Energy Center Period of Record: October -

December 2023 Stability Class - Moderately Unstable -

250Ft-30Ft Delta-T (F)

Winds Measured at 250 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24

> 24 Total N

0 0

0 1

0 0

1 NNE 0

0 0

NE 0

0 0

ENE 0

0 0

E 0

0 0

ESE 0

0 0

SE 0

0 2

0 0

0 2

SSE 0

0 0

s 0

0 0

SSW 0

0 1

0 0

2

_L SW 0

0 2

2 1

0 5

WSW 0

0 0

v'1 0

0 3

3 0

0 6

WNW 0

0 0

1 0

0 1

NW 0

0 0

NNW 0

0 0

2 0

0 2

Variable 0

0 0

Total 0

0 8

10 1

0 19 Hours of calm in this stability class:

0 Hours of missing.wind measurements in this stability class:

0 Hours of missing stability measurements in all stability classes:

0 F-51

Byron Clean Energy Center Period of Record: October -

December 2023 Stability Class - Slightly Unstable -

250Ft-30Ft Delta-T (F)

Winds Measured at 250 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24

> 24 Total N

0 0

0 1

0 0

1 NNE 0

3 0

0 0

0 3

NE 0

1 0

0 2

0 3

ENE 0

0 0

E 0

1 1

1 0

0 3

ESE 0

0 0

SE 0

0 0

0 1

0 SSE 0

0 0

s 0

0 0

2 0

0 2

SS\\17 0

0 1

0 0

0 1

SW 0

0 0

'v'JSW 0

0 0

[;iJ 0

0 1

1 0

0 2

WNW 0

1 0

6 0

0 7

NW 0

0 0

3 0

0 3

NNW 0

0 0

4 0

0 4

Variable 0

0 0

Total 0

6 3

18 3

0 30 Hours of calm in this stability class:

0 Hours of missing wind measurements in this stability class:

0 Hours of missing stability measurements l n all stability classes:

0 F-52

Byron Clean Energy Center Period of Record: October -

December 2023 Stabili Class Neutral -

250Ft-30Ft Delta-T (F)

Winds Measured at 250 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24

> 24 Total N

0 8

24 57 0

0 89 NNE 0

3 10 21 4

0 38 NE 0

2 6

6 3

2 19 ENE 0

C 3

8 0

0 16 0

E 2

10 25 20 3

0 60 ESE 0

7 11 5

1 6

30 SE 0

9

.S 4

5 1

24 SSE 0

7 10 8

8 1

34 s

1 14 18 41 12 3

89 SSW 0

1 6 30 30 7

0 83 Sli'J 1

8 30 31 6

2 78

'iJSW 0

9 31 15 6

1 62 w

l 9

16 40 28 2

96 WNW 2

10 22 39 12 0

85 Nli'J 1

8 18 46 22 2

97 NNW 0

9 23 52 7

4 95 Variable 0

0 0

Total 8

134 282 423 124 24 995 Hours of calm in this stability class:

0 Hours of missing wind measurements in this stability class:

0 Hours of missing stability measurements in all stability classes:

0 F-53

Byron Clean Energy Center Period of Record: October -

December 2023 Stability Class -

Slightly Stable -

250Ft-30Ft Delta-T (F)

Winds Measured at 250 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24

> 24 Total N

0 3

17 28 1

0 49 NNE 0

2 7

11 3

0 23 NE 0

2 2

7 2

0 13 ENE 2

3 3

5 1

0 14 E

1 0

18 28 9

0 56 ESE 0

1 3

11 8

5 28 SE 0

2 5

21 9

0 37 SSE 0

3 8

21 11 1

44 s

1 0

11 45 29 4

90 SSv1J 0

2 13 38 44 4

101 SW 2

l 15 26 12 0

56 WSW 0

2 5

15 0

23

[JV 0

3 12 24 9

0 48 WNW 0

2 27 32 2

0 63 NW 0

4 29 50 4

0 87 NNW l

7 15 10 0

0 33 Variable 0

0 0

Total 7

37 190 372 145 14 765 Hours of calm l n this stability class:

0 Hours of missing wind measurements in this stability class:

0 Hours of missing stability measurements in all stability classes:

0 F-54

Byron Clean Energy Center Period of Record: October -

December 2023 Stability Class -

Moderately Stable -

250Ft-30Ft Delta-T (F) vhnds Measured at 250 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24

> 24 Total N

0 3

1 1

0 0

5 NNE 0

0 2

0 0

3 NE 0

3 0

0 0

0 3

ENE 3

3 0

0 0

0 6

E 2

0 3

2 2

0 9

ESE 0

2 0

4 3

0 9

SE 0

0 1

3 2

0 6

SSE 0

3 3

4 7

0 17 s

0 1

9 12 3

26 J_

SSW 1

0 0

16 9

0 26 SV'*J 1

0 0

13 l

0 15 T;JSW 0

0 4

8 0

0 1 h

~L w

1 2

2 6

0 0

11 WNW 0

4 10 12 0

0 26 NW 0

3 12 6

0 0

21 NNW 0

4 10 0

0 0

14 Variable 0

0 0

Total 9

27 49 85 36 3

209 Hours of calm in this stability class:

0 Hours of missing wind measurements in this stability class:

0 Hours of missing stability measurements in all stability classes:

n u

F-55

Byron Clean Energy Center Period of Record: October -

December 2023 Stability Class -

Extremely Stable -

250Ft-30Ft Delta-T (F)

Winds Measured at 250 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24

> 24 Total N

0 0

3 0

0 0

3 NNE 0

0 1

0 0

0 1

NE 0

1 1

0 0

0 2

ENE 1

1 1

0 0

0 3

E 0

0 0

ESE 0

0 1

0 0

0 1

SE 0

l 1

l 3

0 6

SSE 0

0 6

6 2

0 14 s

1 2

3 11 7

0 24 SSW 1

1 1

11 13 0

27 SW 1

2 3

2 0

9 L

WSW 2

6 3

2 0

0 13 w

0 4

1 4

0 0

9 WNW 1

4 8

5 0

0 18 NW 1

5 3

1 0

0 10 NNW 0

1 1

1 0

0 3

Variable 0

0 0

Total 8

28 37 44 26 0

143 Hours of calm in this stability class:

0 Hours of missing wind measurements in this stability class:

0 Hours of missing stability measurements in all stability classes:

0 F-56

APPENDIX G ERRATA DATA

Intentionally left blank

There was no errata data for 2023.

Intentionally left blank

APPENDIX H ANNUAL RADIOLOGICAL GROUNDWATER PROTECTION PROGRAM REPORT (ARGPPR)

Intentionally left blank

NRG.Docket No 50-454 50-455 Byron Clean Energy Center UNITS 1 and 2 Annual Radiological Groundwater Protection Program Report 1 January Through 31 December 2023 Prepared By Teledyne Brown Engineering Environmental Services 1

Constellation Byron Clean Energy Center Byron, IL 61010 April 2024

Intentionally left blank

Table Of Contents I. Summary and Conclusions.............................................................................................. 1 II. Introduction...................................................................................................................... 2 A. Objectives of the RGPP....................................................................................... 2 B. Implementation of the Objectives........................................................................ 2 C. Program Description............................................................................................ 3 D. Characteristics of Tritium (H-3)............................................................................ 4 Ill. Program Description....................................................................................................... 5 A. Sample Analysis.................................................................................................. 5 B. Data Interpretation............................................................................................... 5 C. Background Analysis........................................................................................... 6

1. Background Concentrations of Tritium...................................................... 6 IV. Results and discussion.................................................................................................. 8 A. Groundwater Results........................................................................................... 8 B. Drinking Water Well Survey................................................................................. 8 C. Summary of Results - Inter-laboratory Comparison Program............................ 8 D. Leaks, Spills, and Releases................................................................................ 8 E. Trends.................................................................................................................. 9 F. Investigations..................................................................................................... 10 G. Actions Taken...................................................................................................... 9

-i-

Appendix A Tables Figures Figure A-1 Appendix B Tables Table B-1.1 Table B-1.2 Table B-1.3 Appendices Location Designation Radiological Groundwater Protection Program - Sampiing Locations, Distance and Direction, Byron Clean Energy Center, 2023 Monitoring Well Locations, Byron Clean Energy Center, 2023 (Extra wells noted on map are for reference only.)

Data Tables Concentrations of Tritium, Strontium and Gross Alpha in Groundwater Samples Collected in the Vicinity of Byron Clean Energy Center, 2023 Concentrations of Gamma Emitters in Groundwater Samples Collected in the Vicinity of Byron Clean Energy Center, 2023 Concentrations of Hard-To-Detects in Groundwater Samples Collected in the Vicinity of Byron Clean Energy Center, 2023

-ii-

I.

Summary and Conclusions In 2006, Exelon (now Constellation) instituted a comprehensive monitoring program to evaluate the impact of station operations on groundwater in the vicinity of Byron Clean Energy Center. The monitoring was conducted in two phases.

Phase 1 of the monitoring was part of a comprehensive study initiated by Exelon to determine whether groundwater or surface water at and in the vicinity of Byron Clean Energy Center had been adversely impacted by any releases of radionuclides. Phase 1 was conducted by Conestoga Rovers and Associates (CRA) and the conclusions were made available to state and federal regulators as well as the public.

Phase 2 of the RGPP was conducted by Exelon corporate and station personnel to initiate follow up of Phase 1 and begin long-term monitoring at groundwater locations selected during Phase 1. This is the fifteenth in a series of annual reports on the status of the Radiological Groundwater Protection Program (RGPP) conducted at Byron Clean Energy Center. This report covers groundwater and surface water samples collected from the environment both on and off station property in 2023. During that time period, 66 analyses were performed on 46 samples from 15 locations.

In 2023, fourteen (14) monitoring wells were sampled in total. Groundwater samples were obtained in March, June, August, and October for tritium. In addition, Sr-89 and Sr-90 analyses were performed on select wells for the samples obtained in June in accordance with site procedures and the Nuclear Energy Institute (NEI) 07-07, Groundwater Protection Initiative. None of these samples showed detectable concentrations of Sr-89/Sr-90. Two wells contained levels of tritium above the lower limit of detection (LLD) of 200 pCi/L. They were AR-4 (265 pCi/L in June, 252 pCi/L in Oct) and AR-11 (420 pCi/L in June, 380 pCi/L in October).

Wells AR-4 and AR-11 are near the Circulating Water Slowdown piping, where historical leakage through vacuum breakers was known to have occurred. These wells have exhibited an overall decreasing trend since 2006. Tritium was not detected in well AR-7, located on-site just west of plant structures, in 2023. All groundwater well sample results are well below the drinking water standard of 20,000 pCi/L tritium. None of the site groundwater wells are used for drinking water, however, should any of the water in these aquifers migrate to off-site wells used for drinking, the off-site dose consequence from tritium present in these wells would be negligible. AMO Environmental Decisions, a nuclear utility groundwater consultant, has reviewed the 2023 RGPP data and concluded there is no evidence of new or ongoing tritium leak(s) at the site.

Analyses for gross alpha in the dissolved and suspended fractions, gamma-emitting nuclides and hard-to-detect (HTD) analyses including americium-241 (Am-241 ), cerium isotopes (Cm-242, Cm-243/244), plutonium isotopes (Pu-238, Pu-239/240), uranium isotopes (U-234, U-235, U-238), iron-55 (Fe-55) and nickel-63 (Ni-63) were not performed on samples in 2023.

In assessing all the data gathered for this report, it was concluded that the operation of Byron Clean Energy Center had no adverse radiological impact on the environment, and there are no known active releases into the groundwater at Byron Clean Energy Center.

II.

Introduction The Byron Station, a two-unit PWR station, is located about two miles east of the Rock River and approximately three miles southwest of Byron in Ogle County, Illinois. The reactors are designed to have capacities of 1,268 and 1,241 MW gross, respectively. Unit One loaded fuel in November 1984 and went online February 2, 1985. Unit Two went online January 9, 1987.

This report covers those analyses performed by Teledyne Brown Engineering (TBE) on samples collected in 2023.

A.

Objectives of the RGPP The long-term objectives of the RGPP are as follows:

1.

Identify suitable locations to monitor and evaluate potential impacts from station operations before significant radiological impact to the environment and potential drinking water sources

2.

Understand the local hydrogeologic regime in the vicinity of the station and maintain up-to-date knowledge of flow patterns on the surface and shallow subsurface

3.

Perform routine water sampling and radiological analysis of water from selected locations

4.

Report new leaks, spills, or other detections with potential radiological significance to stakeholders in a timely manner

5.

Regularly assess analytical results to identify adverse trends

6.

Take necessary corrective actions to protect groundwater resources B.

Implementation of the Objectives The objectives identified have been implemented at Byron Clean Energy Center as discussed below:

1.

Constellation and its consultant identified locations as described in the Phase 1 study. Phase 1 studies were conducted by Conestoga Rovers and Associates (CRA) and the results and conclusions were made available to state and federal regulators as well as the public.

2.

The Byron Clean Energy Center reports describe the local hydrogeologic regime. Periodically, the flow patterns on the surface and shallow subsurface are updated based on ongoing measurements.

3.

Byron Clean Energy Center will continue to perform routine sampling and radiological analysis of water from selected locations.

4.

Byron Clean Energy Center has implemented new procedures to identify and report new leaks, spills, or other detections with potential radiological significance in a timely manner.

5.

Byron Clean Energy Center staff and consulting hydrogeologist assess analytical results on an ongoing basis to identify adverse trends.

C.

Program Description Sample Collection Sample locations can be found in Table A-1 and Figure A-1, Appendix A.

Groundwater/Surface Water Samples of water are collected, managed, transported and analyzed in accordance with approved procedures fo!!m,ving EP.A. methods.

Groundwater is collected from drilled wells. Surface water is collected from the Construction Runoff Pond (CROP), which collects stormwater runoff from the site protected area prior to discharge offsite. Sample locations, sample collection frequencies and analytical frequencies are controlled in accordance with approved station procedures. Contractor and/or station personnel are trained in the collection, preservation management, and shipment of samples, as well as in documentation of sampling events.

Analytical laboratories are subject to internal quality assurance programs, industry cross-check programs, as well as nuclear industry audits. Station personnel review and evaluate all analytical data deliverables as data are received.

Analytical data results are reviewed by both station personnel and an independent hydrogeologist for adverse trends or changes to hydrogeologic conditions.

D.

Characteristics of Tritium (H-3)

Tritium (chemical symbol H-3) is a radioactive isotope of hydrogen. The most common form of tritium is tritium oxide, which is also called "tritiated water." The chemical properties of tritium are essentially those of ordinary hydrogen.

Tritiated water behaves the same as ordinary water in both the environment and the body. Tritium can be taken into the body by drinking water, breathing air, eating food, or absorption through skin. Once tritium enters the body, it disperses quickly and is uniformly distributed throughout the body. Tritium is excreted primarily through urine with a clearance rate characterized by an effective biological half-life of about 14 days. Within one month or so after ingestion, essentially all tritium is cleared. Organically bound tritium (tritium that is incorporated in organic compounds) can remain in the body for a longer period.

Tritium is produced naturally in the upper atmosphere when cosmic rays strike air molecules. Tritium is also produced during nuclear weapons explosions, as a by-product in reactors producing electricity, and in special production reactors, where the isotopes lithium-? and/or boron-10 are activated to produce tritium. Like normal water, tritiated water is colorless and odorless. Tritiated water behaves chemically and physically like non-tritiated water in the subsurface, and therefore tritiated water will travel at the same velocity as the average groundwater velocity.

Tritium has a half-life of approximately 12.3 years. It decays spontaneously to Helium-3 (3He). This radioactive decay releases a beta particle (low-energy electron). The radioactive decay of tritium is the source of the health risk from exposure to tritium. Tritium is one of the least dangerous radionuclides because it emits very weak radiation and leaves the body relatively quickly. Since tritium is almost always found as water, it goes directly into soft tissues and organs. The associated dose to these tissues is generally uniform and is dependent on the water content of the specific tissue.

Ill.

Program Description A.

Sample Analysis This section describes the general analytical methodologies used by TBE to analyze the environmental samples for radioactivity for the Byron Clean Energy Center RGPP in 2023.

In order to achieve the stated objectives, the current program includes the follo'vving analyses (as required by procedure):

1.

Concentrations of strontium in groundwater

2.

Concentrations of tritium in groundwater/surface water

3.

Concentrations of gamma nuclides in groundwater/surface water

4.

Concentrations of gross alpha monitoring in groundwater/surface water

5.

Concentrations of hard-to-detect nuclides (including Fe-55 and Ni-63) in groundwater B.

Data Interpretation The radiological data collected prior to Byron Clean Energy Center becoming operational were used as a baseline with which these operational data were compared. For the purpose of this report, Byron Clean Energy Center was considered operational at initial criticality. Several factors were important in the interpretation of the data:

1.

Lower Limit of Detection and Minimum Detectable Concentration The lower limit of detection (LLD) is specified by federal regulation as a minimum sensitivity value that must be achieved routinely by the analytical parameter.

2.

Laboratory Measurements Uncertainty The estimated uncertainty in measurement of tritium in environmental samples is frequently on the order of 50% of the measurement value.

Statistically, the exact value of a measurement is expressed as a range with a stated level of confidence. The convention is to report results with a 95% level of confidence. The uncertainty comes from calibration standards, sample volume or weight measurements, sampling uncertainty and other factors. Constellation reports the uncertainty of a measurement created by statistical process (counting error) as well as all sources of error (Total Propagated Uncertainty or TPU). Each result has two values calculated. Constellation reports the TPU by following the result with plus or minus +/- the estimated sample standard deviation, as TPU, that is obtained by propagating all sources of analytical uncertainty in measurements.

Analytical uncertainties are reported at the 95% confidence level in this report for reporting consistency with the AREOR.

C.

Background Analysis A pre-operational radiological environmental monitoring program (pre-operational REMP) was conducted to establish background radioactivity levels prior to operation of the Station. The environmental media sampled and analyzed during the pre-operational REMP were atmospheric radiation, fall-out, domestic water, surface water, marine life, and foodstuffs. The results of the monitoring were detailed in the report entitled, Environmental Radiological Allonitoring for Byron lVucfear Generating,"Juclear Power Station, Commonwealth Edison Company, Annual Report 1984, April 1985.

The pre-operational REMP contained analytical results from samples collected from the surface water and groundwater. All groundwater samples listed in the pre-Operational REMP report were <200 pCi/L.

1.

Background Concentrations of Tritium The purpose of the following discussion is to summarize background measurements of tritium in various media performed by others.

Additional detail may be found by consulting references (CRA 2006).

a.

Tritium Production Tritium is created in the environment from naturally occurring processes both cosmic and subterranean, as well as from anthropogenic (i.e., man-made) sources. In the upper atmosphere, "Cosmogenic" tritium is produced from the bombardment of stable nuclides and combines with oxygen to form tritiated water, which will then enter the hydrologic cycle. Below ground, "lithogenic" tritium is produced by the bombardment of natural lithium present in crystalline rocks by neutrons produced by the radioactive decay of naturally abundant uranium and thorium. Lithogenic production of tritium is usually negligible compared to other sources due to the limited abundance of lithium in rock. The lithogenic tritium is introduced directly to groundwater.

A major anthropogenic source of tritium and Sr-90 comes from the former atmospheric testing of thermonuclear weapons. Levels of tritium in precipitation increased significantly during the 1950s and early 1960s, and later with additional testing, resulting in the release of significant amounts of tritium to the atmosphere. The Canadian heavy water nuclear power reactors, other commercial power reactors, nuclear research and weapons production continue to influence tritium concentrations in the environment.

b.

Precipitation Data Precipitation samples are routinely collected at stations around the world for the analysis of tritium and other radionuclides. Two pubiiciy available databases that provide tritium concentrations in precipitation are Global Network of Isotopes in Precipitation (GNIP) and USEPA's RadNet database. GNIP provides tritium precipitation concentration data for samples collected worldwide from 1960 to 2006. RadNet provides tritium precipitation concentration data for samples collected at stations throughout the U.S. from 1960 up to and including 2006. Based on GNIP data for sample stations located in the U.S. Midwest, tritium concentrations peaked around 1963. This peak, which approached 10,000 pCi/L for some stations, coincided with the atmospheric testing of thermonuclear weapons. Tritium concentrations in surface water showed a sharp decline up until 1975 followed by a gradual decline since that time. Tritium concentrations in Midwest precipitation have typically been below 100 pCi/L since around 1980. Tritium concentrations in wells may still be above the 200 pCi/L detection limit from the external causes described above. Water from previous years and decades is naturally captured in groundwater, so some well water sources today are affected by the surface water from the 1960s that was elevated in tritium.

c.

Surface Water Data Tritium concentrations are routinely measured in large surface water bodies, including Lake Michigan and the Mississippi River.

Illinois surface water data were typically less than 100 pCi/L.

The US EPA Rad Net surface water data typically has a reported

'Combined Standard Uncertainty' of 35 to 50 pCi/L. According to US EPA, this corresponds to a+/- 70 to 100 pCi/L 95% confidence bound on each given measurement. Therefore, the typical background data provided may be subject to measurement uncertainty of approximately+/- 70 to 100 pCi/L.

The radioanalytical laboratory is counting tritium results to a Constellation-specified LLD of 200 pCi/L. Typically, the lowest positive measurement will be reported within a range of 40 - 240 pCi/L or 140 +/- 100 pCi/L. Clearly, these sample results cannot be distinguished as different from background at this concentration.

IV.

Results and Discussion A.

Groundwater Results Samples were collected from on-and off-site wells throughout the year in accordance with the station radiological groundwater protection program.

Analytical results and anomalies are discussed below:

Tritium Sampies from all locations were analyzed for tritium activity (Table B-1.1, Appendix B). Tritium values ranged from less than the detection limit to 420 pCi/L. Outside of the station boundary, tritium concentrations were all less than detection limit (<200 pCi/L). The tritium detected in groundwater samples has been isolated to the Galena-Platteville aquifer, which is isolated from the deeper regional groundwater aquifer by the semi-confining Glenwood Formation. Groundwater quality data from production wells and monitoring wells at the station located below this aquifer do not indicate concentrations of tritium greater than the LLD of 200 pCi/L. As such, the tritium impact is limited to the Galena-Platteville aquifer.

Strontium Strontium-89 (Sr-89) and Strontium-90 (Sr-90) were not detected in any samples above their respective LLDs of 10 and 1 pCi/L.

(Table B-1.1, Appendix B)

Gross Alpha (dissolved and suspended)

Gross Alpha analysis in the dissolved and suspended fractions was not performed on samples collected in 2023. (Table B-1.1, Appendix B)

Gamma Emitters Analysis of gamma-emitting nuclides was not performed on groundwater samples in 2023. (Table B-1.2, Appendix B)

Hard-To-Detects Hard-To-Detect (HTD) analyses were not performed on samples in 2023.

(Table B-1.3, Appendix B)

B.

Drinking Water Well Survey No drinking water well surveys were conducted in 2023.

C.

Summary of Results - Inter-Laboratory Comparison Program Inter-Laboratory Comparison Program results for TBE are presented in the AREOR.

D.

Leaks, Spills, and Releases There are no new previously unidentified leaks or plumes at Byron Station.

There were no new leaks, spills or releases at Byron Station in 2023.

E.

Trends Wells AR-4 and AR-11 have shown an overall decrease in tritium concentration since first sampled in 2006.

F.

Investigations There were no investigations that took place in 2023 as a result of groundwater sample results.

G.

Actions Taken

1. Compensatory Actions No compensatory actions were initiated in 2023.

2. Installation of Monitoring Wells No new monitoring wells were installed in 2023.

3. Actions to Recover/Reverse Plumes No actions were undertaken to recover/reverse plumes in 2023.

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APPENDIX A LOCATION DESIGNATION

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TABLE A-1:

Site AR-1 AR-2 AR-3 AR-4 AR-5 AR-6 AR-7 AR-8 AR-9 AR-10 AR-11 AR-12 AR-13 CAR-1 CAR-3 TW-13 CROP Radiological Groundwater Protection Program - Sampling Locations Distance and Direction, Byron Clean Energy Center, 2023 Site Type Temporaey/Permanent Distance and Direction Monitoring Well Permanent 0.36 miles/NNW Monitoring Well Permanent 0.6 miles/NW Monitoring Well Permanent 0.8 miles/NW

~v1onitoiing \\/\\Jell Permanent 1.36 miiestWNW Monitoring Well Permanent 1.92 miles/WNW Monitoring Well Permanent 2.04 miles/WNW Monitoring Well Permanent 0.04 miles/W Monitoring Well Permanent 0.12 miles/S Monitoring Well Permanent 0.24 miles/E Monitoring Well Permanent 0.28 miles/NE Monitoring Well Permanent 1.36 miles/WNW Monitoring Well Permanent 366 feet/W Monitoring Well Permanent 461 feet/WSW Monitoring Well Permanent 2.25 miles/WNW Monitoring Well Permanent 0.16 miles/SE Monitoring Well Permanent 2.3 miles/WNW Surface Water Permanent 0.2 miles NE A-1

)>

I I\\)

0 TW-13 1,000 2,000 Feet DF-24 AR-11 AR-4

/4!"'

AR-11 y Explanation:

AR-4 Surface Water "i?*

Monitoring Well Figure A-1 MW-1 4

AR-3 AR-2 Monitoring Well Locations, Byron Clean Energy Center, 2023

-'-l~'~.

w~.-

\\

APPENDIX B DATA TABLES

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TABLE 8-1.1 CONCENTRATIONS OF TRITIUM AND STRONTIUM IN GROUNDWATER SAMPLES COLLECTED IN THE VICINITY OF BYRON CLEAN ENERGY CENTER, 2023 RESULTS IN UNITS OF PC I/LITER +/- 2 SIGMA COLLECTION SITE DATE H-3 Sr-89 Sr-90 AR-1 03/15/23

< 170 AR-1 06/05/23

< 190

< 5.5

< 0.9 AR-1 08/29/23

< 196 AR-1 10/18/23

< 192 AR-2 06/01/23

< 190 AR-3 03/15/23

< 184 AR-3 06/01/23

< 190

< 9.0

< 0.8 AR-3 08/28/23

< 198 AR-3 10/18/23

< 195 AR-4 03/15/23

< 175 AR-4 06/01/23 265 +/- 125

< 5.1

< 1.0 AR-4 08/28/23

< 197 AR-4 10/18/23 252 +/- 128 AR-7 03/14/23

< 179 AR-7 06/06/23

< 189

< 5.0

< 1.0 AR-7 08/28/23

< 198 AR-7 10/18/23

< 195 AR-8 03/14/23

< 183 AR-8 06/05/23

< 189

< 6.7

< 0.9 AR-8 08/28/23

< 200 AR-8 10/18/23

< 192 AR-9 03/15/23

< 189 AR-9 06/05/23

< 197

< 6.7

< 0.9 AR-9 08/29/23

< 199 AR-9 10/18/23

< 195 AR-10 06/05/23

< 187 AR-11 06/01/23 420 +/- 133 AR-11 10/18/23 380 +/- 133 AR-12 03/14/23

< 181 AR-12 05/31/23

< 199

< 5.4

< 0.9 AR-12 08/28/23

< 197 AR-12 10/18/23

< 196 AR-13 03/14/23

< 179 AR-13 05/31/23

< 194

< 3.8

< 0.8 AR-13 08/28/23

< 198 AR-13 10/18/23

< 190 CAR-1 06/01/23

< 189 CAR-3 03/15/23

< 180 CAR-3 05/31/23

< 185

< 3.9

< 0.8 CAR-3 08/28/23

< 197 CAR-3 10/18/23

< 196

CROP 03/15/23

< 181

CROP 06/05/23

< 192

< 6.7

< 0.9

CROP 08/29/23

< 196

CROP 10/19/23 205 +/- 127 TW-13 06/01/23

< 192

Surface Water Sample B-1

TABLE 8-1.2 co I

I\\J CONCENTRATIONS OF GAMMA EMITTERS IN GROUNDWATER SAMPLES COLLECTED IN THE VICINITY OF BYRON CLEAN ENERGY CENTER, 2023 RESULTS IN UNITS OF PC I/LITER + 2 SIGMA No samples collected or analyzed for gamma emitters in 2023

TABLE B-1.3 co '

C;J CONCENTRATIONS OF HARD-TO-DETECTS IN GROUNDWATER SAMPLES COLLECTE:D IN THE VICINITY OF BYRON CLEAN ENERGY CENTER, 2023 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA No samples collected or analyzed for hard to detects in 2023

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BYRON 2024-0028, Annual Radiological Environmental Operating Report (AREOR)

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