Text

Submittal of 2017 Annual Radiological Environmental Operating Report
	ML18123A186
Person / Time
Site:	Byron
Issue date:	05/03/2018
From:	Kanavos M; Exelon Generation Co
To:	; Document Control Desk, Office of Nuclear Reactor Regulation
References
	BYRON 2018-0042
	Download: ML18123A186 (197)
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EZZ_ Byron Generating Station Exeton Gene ra t on 445ONorthGerrnanChurch Rd www.exeloncorp.com May 3, 2018 LTR: BYRON 2018-0042 File: 1.100101 (YD.101) 2.12.1523(20.111)

United States Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555-0001 Byron Station, Units 1 and 2 Renewed Facility Operating License Nos. NPF-37 and NPF-66 NRC Docket Nos. SIN 50-454 and SIN 50-455

Subject:

2017 Annual Radiological Environmental Operating Report (AREOR)

In accordance with Technical Specification 5.6.2, Annual Radiological Envi ronmental Operating Report, we are submitting the Annual Radiological Environmental Operating Report (AREOR) for Byron Station. This report is required to be submitted to the NRC by May y5th 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 Exelons 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 Mr. Douglas Spitzer, Regulatory Assurance Manager, at (815) 406-2800.

Respectfully, Mark E. Kanavos Site Vice President Byron Generating Station M EKIJG/LZ/rm

Attachment:

AREOR Report cc: Regional Administrator NRC Region Ill

NRC.Docket No: 50-454 50-455 BYRON NUCLEAR GENERATING STATION UNITS land 2 Annual Radiological Environmental Operating Report 1 January Through 31 December 2017 Prepared By Teledyne Brown Engineering Environmental Services

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Intentionally left blank Table Of Contents I. Summary and Conclusions I II. Introduction 2 A. Objectives of the REMP 2 B. Implementation of the Objectives 2 Ill. Program Description 2 A. Sample Collection 2 B. Sample Analysis 5 C. Data Interpretation 5 D. Program Exceptions 6 E. ProgramChanges 7 IV. Results and Discussion 7 A. Aquatic Environment 7 I. SurlaceWater 7

2. GroundWater 8

3. Fish 9

4. Sediment 9 B. Atmospheric Environment 10 I. Airborne 10

a. AirParticulates 10

b. Airbornelodine 11

2. Terrestrial II

a. Milk II

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

Appendices Appendix A Radiological Environmental Monitoring Report Summary Tables Table A-I Radiological Environmental Monitoring Program Annual Summary for Byron Nuclear Generating Station, 2017 Appendix B Location Designation, Distance & Direction, and Sample Collection &

Analytical Methods Tables Table B-I Radiological Environmental Monitoring Program Sampling Locations, Distance and Direction, Byron Nuclear Generating Station, 2017 Table B-2 Radiological Environmental Monitoring Program Summary of Sample Collection and Analytical Methods, Byron Nuclear Generating Station, 2017 Figures Figure B-I Inner Ring and Special Interest OSLD Locations of the Byron Nuclear Generating Station, 2017 Figure B-2 Outer Ring OSLD Locations of the Byron Nuclear Generating Station, 2017 Figure B-3 Onsite Air Sampling Locations of the Byron Nuclear Generating Station, 2017 Figure B-4 Offsite Air Sampling Locations of the Byron Nuclear Generating Station, 2017 Figure B-5 Ingestion and Waterborne Exposure Pathway Sampling Locations of the Byron Nuclear Generating Station, 2017 Appendix C Data Tables and Figures Primary Laboratory Tables Table C-I.1 Concentrations of Gross Beta in Surface Water Samples Collected in the Vicinity of Byron Nuclear Generating Station, 2017.

Table C-I.2 Concentrations of Tritium in Surface Water Samples Collected in the Vicinity of Byron Nuclear Generating Station, 2017.

Table C-l.3 Concentrations of Nickel-63 in Surface Water Samples Collected in the Vicinity of Byron Nuclear Generating Station, 2017 Table C-I.4 Concentrations of Gamma Emitters in Surface Water Samples Collected in the Vicinity of Byron Nuclear Generating Station, 2017

Table C-II.J Concentrations of Tritium in Ground Water Samples Collected in the Vicinity of Byron Nuclear Generating Station, 2017 Table C-ll.2 Concentrations of Gamma Emitters in Ground Water Samples Collected in the Vicinity of Byron Nuclear Generating Station, 2017 Table C-lll.1 Concentrations of Nickel-63 and Gamma Emitters in Fish Samples Collected in the Vicinity of Byron Nuclear Generating Station, 2017 Table C-IV.1 Concentrations of Nickel-63 and Gamma Emitters in Sediment Samples Collected in the Vicinity of Byron Nuclear Generating Station, 2017 Table C-V. I Concentrations of Gross Beta in Air Particulate Samples Collected in the Vicinity of Byron Nuclear Generating Station, 2017 Table C-V.2 Monthly and Yearly Mean Values of Gross Beta Concentrations in Air Particulate Samples Collected in the Vicinity of Byron Nuclear Generating Station, 2017 Table C-V.3 Concentrations of Gamma Emitters in Air Particulate Samples Collected in the Vicinity of Byron Nuclear Generating Station, 2017 Table C-Vl.1 Concentrations of 1-131 in Air Iodine Samples Collected in the Vicinity of Byron Nuclear Generating Station, 2017 Table C-Vll.1 Concentrations of 1-131 in Milk Samples Collected in the Vicinity of Byron Nuclear Generating Station, 2017 Table C-VlI.2 Concentrations of Gamma Emitters in Milk Samples Collected in the Vicinity of Byron Nuclear Generating Station, 2017 Table C-VIll.1 Concentrations of Gamma Emitters in Vegetation Samples Collected in the Vicinity of Byron Nuclear Generating Station, 2017 Table C-lX. I Quarterly OSLD Results for Byron Nuclear Generating Station, 2017 Table C-lX.2 Mean Quarterly OSLD Results for the Inner Ring, Outer Ring, Special Interest, Other and Control Locations for Byron Nuclear Generating Station, 2017 Table C-lX.3 Summary of the Ambient Dosimetry Program for Byron Nuclear Generating Station, 2017 Figures Figure C-I Surface Water Gross Beta Stations BY-12 and BY-29 (C) Collected in the Vicinity of BNGS, 2000 2017 -

Figure C-2 Surface Water Tritium Stations BY-12 and BY-29 (C) Collected in the Vicinity of BNGS, 2000 2017 Figure C-3 Ground Water Tritium

- Station BY-14-1 Collected in the Vicinity of BNGS, 20002017 III

Figure C-4 Ground Water Tritium

- Station BY-J 8-J Collected in the Vicinity of BNGS, 2OJO2017 Figure C-5 Ground Water Tritium

- Station BY-32 Collected in the Vicinity of BNGS, 200620J7 Figure C-6 Ground Water Tritium

- Stations BY-35 Collected in the Vicinity of BNGS, 20062OJZ Figure C-f Ground Water Tritium

- Stations BY-37 and BY-38 Collected in the Vicinity of BNGS, 2006 2017 Figure C-8 Air Particulate Gross Beta Stations BY-08 (C) and BY-2J Collected in the Vicinity of BNGS, 2000 2017-Figure C-9 Air Particulate Gross Beta Stations BY-22 and BY-23 Collected in the Vicinity of BNGS, 2000 2017 Figure C-JO Air Particulate Gross Beta Station BY-24 Collected in the Vicinity of BNGS, 2000 -2017 Figure C-J J Air Particulate Gross Beta Stations BY-OJ and BY-04 Collected in the Vicinity of BNGS, 2005 -2017 Figure C-12 Air Particulate Gross Beta Station BY-06 Collected in the Vicinity of BNGS, 20052017 Appendix D Inter-Laboratory Comparison Program Tables Table D-J Analytics Environmental Radioactivity Cross Check Program Teledyne Brown Engineering, 2017 Table D-2 DOEs Mixed Analyte Performance Evaluation Program (MAPEP)

Teledyne Brown Engineering, 2017 Table D-3 ERA Environmental Radioactivity Cross Check Program Teledyne Brown Engineering, 2017 Appendix E Effluent Report Appendix E-J Data Tables and Figures Appendix F Meteorological Data Appendix G Errata data Appendix H Annual Radiological Groundwater Protection Program Report (ARGPPR) iv

Intentionally left blank Summary and Conclusions This report on the Radiological Environmental Monitoring Program conducted for the Byron Nuclear Generating Station by Exelon covers the period I January 201 7 through 31 December 201 7. During that time period, I ,471 analyses were performed on I ,307 samples. In assessing all the data gathered for this report and comparing these results with preoperational data, it was concluded that the operation of BNGS had no adverse radiological impact on the environment.

Surface water samples were analyzed for concentrations of gross beta, tritium, 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. Non-plant produced Cesium-I 37 (Cs-I 37) activity was detected at one sediment location at a concentration of 202 pCi/kg. Low levels of Cs-I 37 are detected occasionally and are consistent with data from previous years and are not a result of plant effluents.

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

High sensitivity lodine-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 I-I 31 and gamma-emitting nuclides. All I-I 31 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 (OSLD). Beginning in 2012, Exelon 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 result in a step change in readings, up or down, depending on site characteristics. The relative comparison to control locations remains valid.

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

I

Intentionally left blank Introduction Byron Station, a two-unit PVVR 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 I ,268 and I ,241 MW gross, respectively. Unit One loaded fuel in November 1 984 and went on line February 2, 1985. UnitTwo 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 I January 2017 through 31 December2017.

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

I . 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:

I . 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 BNGS REMP were collected for Exelon Nuclear by Environmental Inc. (Midwest Labs). This section describes the general collection methods used by Environmental Inc. to obtain environmental samples for the BNGS REMP in 201 7. Sample locations and descriptions can be found in Table Bi and Figures Bi through B5, 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 locationJ) and quarterly from six ground water locations (BY-i 4-i BY-i 8-i 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, silver redhorse, golden redhorse, river carpsucker, bigmouth buffalo and common carp were collected semiannually at two locations, BY-29 (control) and BY-3i Sediment samples composed of recently deposited substrate were collected at two locations semiannually, BY-i2 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-Ol 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-i 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 August at five locations (BY-Control, BY-Quad I 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 201 2, Exelon changed the type of dosimetry used for the Radiological Environmental Monitoring Program (REM P). Optically Stimulated Luminescent Dosimetry (OSLD) 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.

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

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

An inner ring consisting of 16 locations (BY-JOJ, BY-102, BY-103, BY-I 04, BY-I 05, BY-I 06, BY-I 07, BY-I 08, BY-I 09, BY-I I 0, BY-I I I, BY-I I 2, BY-I I 3, BY-I I 4, BY-I I 5 and BY-I I 6) near and within the site perimeter representing fence post doses (i.e., at locations where the doses will be potentially greater than maximum annual offsite doses) from BNGS 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-2I 0, BY-2I I, BY-2I 2, BY-2I 3, BY-2I 4, BY-21 5 and BY-21 6) 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-301-2, BY-309-I 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-Ol 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 OSLD locations were determined by the following criteria:

I . The presence of relatively dense population;

2. Site meteorological data taking into account distance and elevation for each of the sixteen22 1/2 degree sectors around the site, where estimated annual dose from BNGS, 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 located at a minimum of five feet 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 TEE to analyze the environmental samples for radioactivity for the BNGS REMP in 201 7. 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:

I . 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 lodine-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 Nuclear Generating Station becoming operational were used as a baseline with which these operational data were compared. For the purpose of this report, Byron Nuclear Generating Station 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 ENGS 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 and vegetation twelve nuclides, Mn-54, Co-58, Fe-59, Co-60, Zn-65, Nb-95, Zr-95, I-I 31 Cs-I 34, Cs-I 37, Ba-I 40 and La-I 40 were reported.

For fish, sediment, air particulate and milk eleven nuclides, Mn-54, Co-58, Fe-59, Co-60, Zn-65, Nb-95, Zr-95, Cs-I 34, Cs-137, Ba-I40 and La-I40 were reported.

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

D. Program Exceptions For 201 7, the BNGS REMP had a sample recovery rate in excess of 99%.

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

TABLE D-1 LISTING OF SAMPLE ANOMALIES Sample Location Collection Type Code Date Reason OLSD BY-22-2 4th 01/09/1 8 Qtr dosimeter found on ground during exchange TABLE D-2 LISTING OF MISSED SAMPLES Sample Location Collection Type Code Date Reason SW BY-29 01/03/1 7 No sample, water frozen SW BY-29 01/10/17 No sample, water frozen Dosimeter missing during monthly checks; OLSD BY-213-4 05/01/17 replaced with Spare #1 SW BY-29 I 2/1 2/1 7 No sample, water frozen SW I 2/27/1 7 No sample, water frozen 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 2017.

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). Ofthese locations only BY-12 located downstream, could be affected by Byron Nuclear Generating Stations effluent releases. The following analyses were performed:

Gross Beta Samples from both locations were analyzed for concentrations of gross beta (Table Cl.J, Appendix C). The values ranged from 2.5 to 6.7 pCi/I. Concentrations detected were consistent with those detected in previous years (Figure , Appendix C).

Tritium Quarterly composites of weekly collections were analyzed for tritium activity (Table Cl.2, Appendix C). Tritium was detected in two samples. The concentrations ranged from 293 61 1 0 pCi/L (Figure C2, Appendix C). 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 concentration of Ni-63 (Table Cl.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 Cl.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-I 8-I BY-32, BY-35, BY-37 and BY-38). These locations could be affected by Byron Nuclear Generating Stations effluent releases. The following analyses were performed:

Tritium Quarterly grab samples from the locations were analyzed for tritium activity (Table Cll.I Appendix C). No tritium was detected, and the required LLD was met (Figures C3 through C7, Appendix C).

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

3. Fish Fish samples comprised of freshwater drum, silver redhorse, golden redhorse, river carpsucker, bigmouth buffalo and common carp were collected at two locations (BY-29 and BY-31) semiannually. Location BY-31 could be affected by Byron Nuclear Generating Stations effluent releases. The following analyses were performed:

Nickel The edible portion of fish samples from both locations was analyzed for Ni-63 (Table Clll.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 Clll.J, 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 Nuclear Generating Stations effluent releases.

The following analyses were performed:

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

Gamma Spectrometrv Sediment samples from both locations were analyzed for gamma-emitting nuclides (Table ClV.J Appendix C). Cesium-137 was detected in one sample. The concentration was 202 pCi/kg dry.

The concentrations detected was consistent with those detected in previous years and is not a result of plant effluents. No other nuclides were detected, and all required LLDs were met.

B. Atmospheric Environment I . 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-22, BY-23 and BY-24), Far Field samplers between 4 and JO km ofthe site (BY-Ol, 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 CV. I and CV.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 BNGS.

The results from the Nearsite locations (Group I) ranged from 5 to 32E3 pCi/m3 with a mean of I 7E3 pCi/m3.

The results from the Far Field locations (Group II) ranged from 6 to 27E3 pCi/m3 with a mean of I 7E3 pCi/m3.

The results from the Control location (Group Ill) ranged from 8 to 31 E3 pCi/m3 with a mean of I 8 E3 pCi/m3.

Comparison of the 201 7 air particulate data with previous years data indicate no effects from the operation of BNGS.

In addition, a comparison of the weekly mean values for 201 7 indicate no notable differences among the three groups (Figures C8 through C-12, Appendix C).

Gamma Spectrometry Weekly samples were composited quarterly and analyzed for gamma-emitting nuclides (Table CV.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-04, BY-06, BY-08, , BY-22, BY-23 and BY-24) and analyzed weekly for I-I 31 (Table CVl. I, Appendix C). All results were less than the minimum detectable concentration for I-I 31.

2. Terrestrial

a. Milk Samples were collected from two locations (BY-20-J 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 CVll.J 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 CVll.2, Appendix C). No nuclides were detected, and all required LLDs were met.

b. Vegetation Vegetation samples were collected at five locations (BY-Control, BY-Quad I BY-Quad 2, BY-Quad 3 and BY-Quad 4). Four locations (BY-Quad I BY-Quad 2, BY-Quad 3 and BY-Quad 4) could be affected by Byron Nuclear Generating Stations effluent releases. The following analysis was performed:

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

11

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

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

All OSLD measurements were below 31 mR/standard quarter, with a range of 15 to 31 mR/standard quarter. A comparison ofthe 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 2017 around the Byron Nuclear Generating Station (BNGS) was performed by Environmental Inc.

(Midwest Labs) for Exelon Nuclear to comply with the Byron Nuclear Generating Stations 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 % degree sectors. The results of this survey are summarized below:

Distance in Miles from the BNGS Vent Stacks Sector Residence Livestock Milk Farm Miles Miles Miles A N 1.2 5.9 -

B NNE 1.6 1.6 -

C NE 1.1 4.6 -

D ENE 1.4 3.5 -

E E 1.2 4.2 -

F ESE 1.5 1.5 -

C SE 1.7 4.3 -

H SSE 0.7 3.3 -

J S 0.6 0.7 -

K SSW 0.7 1.0 -

L SW 0.8 2.0 -

M WSW(a) 1.6 0.8 4.5 N W 1.8 3.4 -

P WNW 1.6 5.3 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 2017.

-12 -

F. Summary of Results Inter-Laboratory Comparison Program The TEE Laboratory analyzed Performance Evaluation (PE) samples of air particulate, air iodine (charcoal), milk, soil, vegetation and water (including fish) matrices (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 DOEs Mixed Analyte Performance Program (MAPEP) were evaluated against the following pre set acceptance criteria:

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

2. ERA Evaluation Criteria ERAs evaluation report provides an acceptance range for control and warning limits with associated flag values. ERAs acceptance limits are established per the USEPA, NELAC, state specific PT program requirements or ERAs 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 MAPEPs 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 13 -

facilities.

For the TEE laboratory, I 68 out of I 73 analyses performed met the specified acceptance criteria. Five analyses did not meet the specified acceptance criteria for the following reasons and were addressed through the TEE Corrective Action Program.

I . The ERA April 201 7 two nuclides in water were evaluated as Not Acceptable. (NCR I 7-09)

a. The Zn-65 result of 39.3 pCi/L, exceeded the lower acceptance limit of 47.2. The known value was unusually low for this study.

The sample was run in duplicate on two different detectors. The results of each were 39.3 +/- I 8.2 pCi/L (46% error and lower efficiency) and 59.3 +/- 8.23 pCi/L (13.9% error and higher efficiency). The result from the 2nd detector would have been well within the acceptable range (47.2 65.9) and 110.2% of the known value of 53.8 pCi/L.

b. The Sr-89 result of 40.7 pCi/L exceeded the lower acceptance limit of 53.8. All associated QC and recoveries were reviewed and no apparent cause could be determined for the failure. The prior three cross-check results were from 99 I I 5% of the known values and the one that followed this sample (November, 2017) was 114% ofthe known value.

2. The DOE MAPEP August 201 7 air particulate U-238 result of 0.115

+/- 0.025 Eq/sample was higher than the known value of 0.087 +/-

0.002 with a ratio of I .32, therefore the upper ratio of I .30 (acceptable with warning) was exceeded. TEEs result with error easily overlaps with the acceptable range. MAPEP does not evaluate results with any associated error. Also, the spike level for this sample was very low (2.35 pCi) compared to TEEs normal LCS of 6 pCi. TEE considers this result as passing. (NCR I 7-15)

3. The Analytics September 201 7 soil Cr-SI result was evaluated as Not Acceptable (Ratio of TEE to known result at 0.65). The reported value was 0.230 +/- 0.144 pCi/g and the known value was 0.355 +/- 0.00592 pCi/g. The sample was counted overnight for 14 hours1.62037e-4 days 0.00389 hours 2.314815e-5 weeks 5.327e-6 months , however the Cr-SI was spiked at a very low level and had a counting error of 65%. Cr-SI has a 27-day half-life, making low-level quantification even more difficult. The error does not appear to have been taken into consideration for this result. If it had been evaluated with the error, the highest result would have been I 05%

of the reference value, which is acceptable. Also, the known value is significantly lower than TEEs typical MDC for this nuclide in a soil matrix and would typically not be reported to clients (unless specified). The results of all of the previous cross-checks have been in the acceptable (80 120%) range. TEE will evaluate further upon completion ofthe next ICP sample. (NCR 17-16)

4. The ERA November 2017 water Sr-90 sample was evaluated as Not Acceptable. TEEs result of 27. 1 pCi/L exceeded the lower acceptance range (30.8 48.0 pCi/L). After reviewing the associated QC data for this sample, it was determined that although the spike recovery for Sr-90 was within our laboratory guidelines (70% -1 30%), both the spike result and our ERA result were biased low. The original cross-check sample was completely consumed and we were unable to reanalyze before submitting the result. We have modified our preparation process to avoid this situation for future cross-check samples. We also have enhanced LIMS programming to force a LCSD when a workgroup includes cross-check samples (as opposed to running a DUP).

(NCR 17-19)

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

15 -

Intentionally left blank APPENDIX A RADIOLOGICAL ENVIRONMENTAL MONITORING REPORT

SUMMARY

Intentionally left blank TABLE A-i RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANNUAL

SUMMARY

FOR BYRON NUCLEAR GENERATING STATION, 2017 NAME OF FACILITY: BYRON NUCLEAR GENERATING STATION DOCKET NUMBER: 50-454 & 50-455 LOCATION OF FACILITY: BYRON, IL REPORTING PERIOD: 2017 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) MEAN (M) STATION # NONROUTINE PATHWAY SAMPLED ANALYSIS ANALYSIS OF DETECTION (F) (F) (F) NAME REPORTED (Uint ofMeasurement) PERFORMED PERFORMED (LLD) RANGE RANGE RANGE DISTANCE AND DIRECTION MEASUREMENTS SURFACE WATER GR-B 24 4 4.2 4.3 4.3 BY-29 CONTROL 0 (PCI/LITER) (9/12) (10/12) (10/12) -

Byron Upstream 3.1-5.6 2.5-6.7 2.5-6.7 3.0 MILES N OF SITE H-3 8 200 3202 <LLD 3202 BY-I2INDICATOR 0 (2/4) -

Oregon Pool of Rock River Downstream (2/4) 293-6110 293- 6110 4.5 MILES 55W OF SITE 30 -

NI-63 24 <LLD <LLD 0 GAMMA 24 MN-54 15 <LLD <LLD - 0 CO-58 15 <LLD <LLD - 0 FE-59 30 <LLD <LLD - 0 CO-60 15 <LLD <LLD 0 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 (PCI/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-I RADIOLOGICAL ENViRONMENTAL MONITORING PROGRAM ANNUAL

SUMMARY

FOR BYRON NUCLEAR GENERATING STATION, 2017 NAME OF FACILITY: BYRON NUCLEAR GENERATING STATION DOCKET NUMBER: 50-454 & 50-455 LOCATION OF FACILITY: BYRON, IL REPORTING PERIOD: 2017 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) MEAN (M) STATION # NONROUTINE PATHWAY SAMPLED ANALYSIS ANALYSIS OF DETECTION (F) (F) (F) NAME REPORTED (Uint olMeasurement) PERFORMED PERFORMED (LLD) RANGE RANGE RANGE DISTANCE AND DIRECTION MEASUREMENTS FISH NI-63 8 260 <LLD <LLD - 0 (PCI/KG WET)

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-737 150 <LLD <LLD 0 BA-140 NA <LLD <LLD 0 LA-140 NA <LLD <LLD 0 SEDIMENT NI-63 4 260 <LLD <LLD - 0 (PCI/KG DRY)

GAMMA 4 MN-54 NA <LLD <LLD 0 CO-58 NA <LLD <LLD - 0 EE-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-137 180 202 <LLD 202 BY-12 INDICATOR 0 (1/2) -

Oregon Pool of Rock River Downstream (1/2) 4.5 MILES 55W OF SITE 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-I RADIOLOGICAL ENViRONMENTAL MONITORING PROGRAM ANNUAL

SUMMARY

FOR BYRON NUCLEAR GENERATING STATION, 2017 NAME OF FACILITY: BYRON NUCLEAR GENERATING STATION DOCKET NUMBER: 50-454 & 50-455 LOCATION OF FACILITY: BYRON, IL REPORTING PERIOD: 2017 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) MEAN (M) STATION # NONROUTINE PATHWAY SAMPLED ANALYSIS ANALYSIS OF DETECTION (F) (F) (F) NAME REPORTED (Uint olMeasurement) PERFORMED PERFORMED (LLD) RANGE RANGE RANGE DISTANCE AND DIRECTION MEASUREMENTS AIR PARTICULATE GR-B 416 10 17 18 18 BY-08 CONTROL 0 (E-3 PCI/CU.METER) (360/364) (51/52) (51/52) LEAF RIVER 5-32 8-31 8-31 7.OMILESWNWOFSITE 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-134 150 <LLD <LLD - 0 CS-137 180 <LLD <LLD - 0 BA-740 NA <LLD <LLD - 0 LA-140 NA <LLD <LLD - 0 w

AIRIODINE GAMMA 416 (E-3 PCI/CU.METER) 1-137 (GEL!) 70 <LLD <LLD - 0 MILK 1-131 (LOW LVL) 40 1 <LLD <LLD - 0 (PCI/LITER)

GAMMA MN-54 40 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-734 15 <LLD <LLD - 0 CS-137 18 <LLD <LLD - 0 BA-140 60 <LLD <LLD - 0 LA-140 15 <LLD <LLD - 0 (M) The Mean Values are calculated using the positive values. (F) Fraction of detectable measurement are indicated in parentheses.

TABLE A-f RADIOLOGICAL ENViRONMENTAL MONITORING PROGRAM ANNUAL

SUMMARY

FOR BYRON NUCLEAR GENERATING STATION, 2017 NAME OF FACILITY: BYRON NUCLEAR GENERATING STATION DOCKET NUMBER: 50-454 & 50-455 LOCATION OF FACILITY: BYRON, IL REPORTING PERIOD: 2017 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) MEAN (M) STATION # NONROUTINE PATHWAY SAMPLED ANALYSIS ANALYSIS OF DETECTION (F) (F) (F) NAME REPORTED (Uint olMeasurement) PERFORMED PERFORMED (LLD) RANGE RANGE RANGE DISTANCE AND DIRECTION MEASUREMENTS VEGETATION GAMMA 11 (PCI/KG 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 1-131 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-QUARTERLY 364 NA 23.7 21.2 27.5 BY-208-1 INDICATOR 0 (MILLIREMIQTR.) (356/356) (8/8) (4/4) 15.4 31.2 -

18.1 25.0 -

24.3 30.2 4.0 MILES SSE (M) The Mean Values are calculated using the positive values. (F) Fraction of detectable measurement are indicated in parentheses.

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

Intentionally Left Blank TABLE B-I: Radiological Environmental Monitoring Program Sampling Locations, Distance and Direction, Byron Nuclear Generating Station, 2017 Location Location Description Distance & Direction From Site A. Surface Water BY-I 2 Oregon Pool of Rock River, Downstream 4.5 miles 55W BY-29 Byron, Upstream (control) 3.0 miles N B. Ground/Well Water BY-14-I 3200 North German Church Road 1.0 miles SSE BY-I 8-1 Calhoun 0.7 miles 55W BY-32 Krueger Well 1.9 miles W BY-35 Vancko Well 1.9 miles WNW BY-37 Kavage Well 2.0 miles WNW BY-38 Steve Storz Well 2.0 miles VVNW C. Milk BY-20-l Ron Snodgrass Farm 4.8 miles WSW BY-26-2 Joseph Akins Farm (control) 12.2 miles WNW D. Air Particulates I Air Iodine BY-Ol Byron 3.0 miles N BY-04 Paynes Point 5.0 miles SE BY-06 Oregon 4.7 miles 55W BY-08 Leaf River (control) 7.0 miles WNW BY-2I Byron Nearsite North 0.3 miles N BY-22 Byron Nearsite Southeast 0.4 miles SE BY-23 Byron Nearsite South 0.6 miles S BY-24 Byron Nearsite Southwest 0.7 miles SW E. Fish BY-29 Byron, Upstream (control) 3.0 miles N BY-31 Byron, Discharge 2.6 miles WNW F. Sediment BY-12 Oregon Pool of Rock River, Downstream 4.6 miles 55W BY-34 Rock River, Upstream of Discharge (control) 2.6 miles WNW G. Vegetation Quadrant 1 5186 N. Cox Road, Stillman Valley 4.8 miles ENE Quadrant 2 5671 Brick Road, Oregon 4.4 miles SE Quadrant 3 2002 Deer Path Road, Oregon 0.9 miles SW Quadrant 4 2770 Breckenridge Dr., Byron 5.3 miles N Control 17311 E. Edson Rd., Rockford 14.8 miles ENE H. Environmental Dosimetry OSLD-Inner Ring BY-l0I-I and-2 0.3 miles N BY-I 02-1 1.0 miles NNE BY-I 02-2 1.0 miles NNE B-I

TABLE B-i: Radiological Environmental Monitoring Program Sampling Locations, Distance and Direction, Byron Nuclear Generating Station, 2017 Location Location Description Distance & Direction From Site H. Environmental Dosimetry OSLD (continued)

Inner Ring BY-i03-i and -2 i.7 miles NE BY-i 03-3 0.4 miles NE BY-i04-i and -2 i .4 miles ENE BY-i 04-3 0.3 miles ENE BY-i05-i and-2 i.3 miles E BY-i06-i and-2 i.4 miles ESE BY-i07-i and -2 1.4 miles SE BY-i 07-3 0.4 miles SE BY-i 08-i 0.7 miles SSE BY-i 08-2 0.6 miles SSE BY-109-i and-2 0.6 miles S BY-hO-i and-2 0.7 miles 55W BY-iii-3 0.8 miles SW BY-ili-4 0.9 miles SW BY-i 12-3 and -4 0.8 miles WSW BY-ii3-i and-2 0.7 miles W BY-ii4-i and-2 0.8 miles WNW BY-i15-i and-2 i.0 miles NW BY-ii6-i and-2 I .4 miles NNW BY-i i6-3 0.9 miles NNW Outer Ring BY-20i -3 4.4 miles N BY-20i -4 4.4 miles N BY-202-i 4.4 miles NNE BY-202-2 4.8 miles NNE BY-203-i 4.8 miles NE BY-203-2 4.7 miles NE BY-204-i 4.i miles ENE BY-204-2 4.0 miles ENE BY-205-i and -2 3.8 miles E BY-206-i 4.0 miles ESE BY-206-2 4.3 miles ESE BY-207-i 4.2 miles SE BY-207-2 3.9 miles SE BY-208-i 4.0 miles SSE BY-208-2 3.8 miles SSE BY-209-i and -4 4.0 miles S BY-2i0-3 and -4 3.9 miles 55W BY-2ii-i and-4 4.9 miles SW BY-2i2-i and-4 4.7 miles WSW BY-2J 3-i 4.7 miles W BY-2i 3-4 4.7 miles W BY-2i 4-i 4.7 miles WNW BY-2i 4-4 4.6 miles WNW BY-2i 5-i 4.2 miles NW BY-2i 5-4 4.2 miles NW BY-2i 6-i 4.5 miles NNW BY-2i 6-2 4.7 miles NNW B-2

TABLE B-i: Radiological Environmental Monitoring Program Sampling Locations, Distance and Direction, Byron Nuclear Generating Station, 2017 Location Location Description Distance & Direction From Site Special Interest BY-30i-i 0.3 miles N BY-30i -2 0.2 miles N BY-309-i 0.3 miles S BY-309-2 0.4 miles S BY-309-3 0.4 miles S BY-309-4 0.4 miles 55W BY-3i 4-2 0.3 miles WNW Other BY-Oi-i and-2 3.0 miles N BY-04-i and -2 5.0 miles SE BY-06-J and -2 4.7 miles 55W BY-2i-i and-2 0.3 miles N BY-22-i and -2 0.4 miles SE BY-23-i and -2 0.6 miles S BY-24-i and -2 0.7 miles SW Control BY-08-i and -2 7.0 miles WNW B-3

TABLE B-2: Radiological Environmental Monitoring Program Summary of Sample Collection and Analytical Methods, Byron Nuclear Generating Station, 2017 Sample Analysis Sampling Method Analytical Procedure Number Medium Surface Water Gamma Spectroscopy Monthly composite from TEE, TEE-2007 Gamma emitting radioisotope analysis weekly grab samples.

Surface Water Gross Beta Monthly composite from TEE, TBE-2008 Gross Alpha and/or gross beta activity in weekly grab samples. various matrices Surface Water Nickel-63 Monthly composite from TEE TBE-2013 Radionickel activity in various matrices weekly grab samples.

Quarterly composite Surface Water Tritium from weekly grab TEE, TEE-201 1 Tritium analysis in drinking water by liquid samples. scintillation Ground Water Gamma Spectroscopy Quarterly grab samples. TEE, TEE-2007 Gamma emitting radioisotope analysis Ground Water Tritium Quarterly grab samples. TEE, TEE2OII Tritium analysis in drinking water by liquid scintillation Semi-annual samples collected via Fish Gamma Spectroscopy electroshocking or other TEE-2007 Gamma emitting radioisotope analysis techniques Semi-annual samples Fish Nickel-63 collected via TEE, TEE-2013 Radionickel activity in various matrices electroshocking or other techniques Sediment Gamma Spectroscopy Semi-annual grab TEE, TEE-2007 Gamma emitting radioisotope analysis samples Semi-annual grab . . . . . .

Sediment Nickel-63 TEE, TEE2013 Radionickel activity in various matrices samples One-week composite of Air Particulates Gross Eeta continuous air sampling TEE, TEE-2008 Gross Alpha and/or gross beta activity in through glass fiber filter various matrices paper Air Particulates Gamma Spectroscopy Quarterlycomposite of TEE, TEE-2007 Gamma emitting radioisotope analysis each station One-week composite of Air Iodine Gamma Spectroscopy continuous air sampling TEE, TEE-2007 Gamma emitting radioisotope analysis through charcoal filter Ei-weekly grab sample when cows are on Milk -131 pasture. Monthly all TEE, TEE-2012 Radioiodine in various matrices other times Ei-weekly grab sample when cows are on Milk Gamma Spectroscopy pasture. Monthly all TEE, TEE-2007 Gamma emitting radioisotope analysis other times Vegetation Gamma Spectroscopy Annual grab samples. TEE, TEE-2007 Gamma emitting radioisotope analysis Optically Stimulated Quarterly OSLDs OSLD Luminescence comprised oftwo Landauer Incorporated Dosimetry A1203:C Landauer Incorporated elements.

B-4

I Figure B-I Inner Ring and Special Interest OSLD Locations of the Byron Nuclear Generating Station, 2017 B-5

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Figure 6.3b Outer Ring Dosimeter Locations finer circe dstance 3.7 mi Outer crce thstence 0 rn Figure B-2 Outer Ring OSLD Locations of the Byron Nuclear Generating Station, 2017 B-6

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Intentionally left blank APPENDIX C DATA TABLES AND FIGURES PRIMARY LABORATORY

Intentionally left blank Table C-l.1 CONCENTRATIONS OF GROSS BETA IN SURFACE WATER SAMPLES COLLECTED IN THE VICINITY OF BYRON NUCLEAR GENERATING STATION, 2017 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION PERIOD BY-12 BY-29 01/03/17 - 01/31/17 3.1 +/- 1.9 6.7 +/- 2.1 02/07/17 - 02/28/17 5.6 +/- 2.3 4.5 +/- 2.2 03/07/17 - 03/28/17 44 +/- 2.0 4.0 +/- 2.0 04/04/17 - 04/25/17 4.4 +/- 1.8 5.5 +/- 1.9 05/02/17 - 05/30/17 < 2.5 3.3 +/- 1.8 06/06/17 - 06/27/17 < 2.5 < 2.6 07/03/17 - 07/25/17 4.6 +/- 1.8 5.0 +/- 1.8 08/01/17 - 08/29/17 3.1 +/- 1.8 3.1 +/- 1.8 09/05/17 - 09/26/17 4.0 +/- 1.9 3.3 +/- 1.9 10/03/17 - 10/31/17 3.7 +/- 2.0 < 2.8 11/07/17 - 11/28/17 < 2.4 2.5 +/- 1.7 12/05/17 - 12/19/17 5.1 +/- 2.1 4.9 +/- 2.1 MEAN +/- 2 STD DEV 4.2 +/- 1 .7 4.3 +/- 2.6 Table C-l.2 CONCENTRATIONS OF TRITIUM IN SURFACE WATER SAMPLES COLLECTED IN THE VICINITY OF BYRON NUCLEAR GENERATING STATION, 2017 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION PERIOD BY-12 BY-29 01/03/17 - 03/28/1 7 6110 +/- 665 < 190 04/04/1 7 - 06/27/17 < 192 < 191 07/03/17 - 09/26/1 7 293 +/- 127 < 190 10/03/17 - 12/19/17 < 198 < 193 MEAN +/- 2 STD DEV 3202 +/- 8226 Table C-I.3 CONCENTRATIONS OF Nl-63 IN SURFACE WATER SAMPLES COLLECTED IN THE VICINITY OF BYRON NUCLEAR GENERATING STATION, 2017 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION PERIOD BY-12 BY-29 01/03/17 - 01/31/17 < 13 < 14 02/07/1 7 - 02/28/1 7 < 26 < 25 03/07/17 - 03/28/17 < 15 < 13 04/04/1 7 - 04/25/1 7 < II < Ii 05/02/1 7 - 05/30/1 7 < 13 < I3 06/06/17 - 06/27/17 < 14 < 15 07/03/17 - 07/25/17 < 14 < 14 08/01/17 - 08/29/17 < 17 < 17 09/05/17 - 09/26/17 < 13 < 14 10/03/17 - 10/31/17 < 18 < 18 11/07/17 - 11/28/17 < 11 < 12 12/05/17 - 12/19/17 < 20 < 26 MEAN - -

THE MEANAND fl/i/O STANDARD DEVIATIONARE CALCULATED USING THE POSITIVE VALUES C-I

Table C-l.4 CONCENTRATIONS OF GAMMA EMITTERS IN SURFACE WATER SAMPLES COLLECTED IN THE VICINITY OF BYRON NUCLEAR GENERATING STATION, 2017 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 -131 Cs-134 Cs-137 Ba-140 La-140 BY-12 01/03/17 - 01/31/17 <2 <2 <5 <2 <4 <2 <4 <8 <2 <2 <15 <5 02/07/1 7 - 02/28/17 <3 <4 <7 <3 <7 <4 <7 <14 <4 <4 <30 <9 03/07/17 - 03/28/17 <3 <3 <8 <3 <5 <3 <7 <14 <3 <3 <25 <9 04/04/17 - 04/25/17 <2 <2 <4 <2 <3 <2 <4 <8 <2 <2 <15 <5 05/02/1 7 - 05/30/17 <1 <2 <4 <1 <3 <2 <3 <15 <1 <1 <22 <7 06/06/17 - 06/27/17 <3 <4 <9 <3 <9 <5 <8 <14 <4 <5 <23 <9 07/03/17 - 07/25/17 <2 <3 <6 <2 <4 <3 <4 <10 <2 <2 <18 <5 08/01/17 - 08/29/17 <2 <2 <5 <2 <4 <2 <4 <12 <2 <2 <21 <7 09/05/1 7 - 09/26/17 <2 <2 <5 <2 <4 <2 <4 <10 <2 <2 <20 <7 10/03/17 - 10/31/17 <3 <4 <7 <4 <7 <4 <7 <15 <4 <4 <29 <10 11/07/17 - 11/28/17 <3 <3 <6 <3 <6 <3 <5 <9 <3 <3 <20 <7 12/05/17 - 12/19/17 <2 <3 <6 <2 <4 <3 <4 <14 <2 <2 <25 <9 MEAN 9

r3 BY-29 01/17/17 - 01/31/17 <6 <7 < 13 <

<5 <13 <8 13 <15 <6 <7 <32 <9 02/07/17 - 02/28/17 <3 <3 <7 <4 <7 <4 <6 <13 <3 <3 <27 <8 03/07/1 7 - 03/28/17 <3 <3 <8 <4 <6 <4 <7 <14 <3 <4 <27 <8 04/04/1 7 - 04/25/17 <2 <2 <5 <2 <4 <2 <4 <9 <2 <2 <18 <5 05/02/1 7 - 05/30/17 <1 <1 <3 <1 <2 <2 <3 <15 <1 <1 <20 <6 06/06/17 - 06/27/17 <5 <6 < 11 <5 <11 <6 <9 <14 <6 <6 <33 <10 07/03/17 - 07/25/17 <3 <3 <7 <3 <6 <3 <6 <14 <3 <3 <27 <7 08/01/17 - 08/29/17 <2 <2 <6 <2 <4 <2 <4 <13 <2 <2 <23 <7 09/05/17 - 09/26/17 <2 <2 <5 <2 <4 <3 <4 <11 <2 <2 <21 <7 10/03/17 - 10/31/17 <4 <4 <7 <3 <7 <3 <6 <14 <4 <3 <29 <10 11/07/17 - 11/28/17 <3 <3 <8 <4 <7 <4 <6 <11 <4 <3 <23 <7 12/05/17 - 12/19/17 <2 <3 <6 <3 <5 <3 <5 <15 <2 <2 <25 <10 MEAN

Table C-ll.1 CONCENTRATIONS OF TRITIUM IN GROUND WATER SAMPLES COLLECTED IN THE VICINITY OF BYRON NUCLEAR GENERATING STATION, 2017 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION PERIOD BY-14-J BY-18-J BY-32 BY-35 BY-37 BY-38 01/10/17 - 01/24/17 < 189 < 185 < 188 < 183 < 196 < 189 04/11/17 - 04/11/17 < 192 < 189 < 193 < 190 < 189 < 192 07/1 1/1 7 - 07/1 1/1 7 < 192 < 194 < 193 < 193 < 195 < 190 10/10/17 - 10/10/17 < 187 < 183 < 185 < 182 < 187 < 177 MEAN C-3

Table C-ll.2 CONCENTRATIONS OF GAMMA EMITTERS IN GROUND WATER SAMPLES COLLECTED IN THE VICINITY OF BYRON NUCLEAR GENERATING STATION, 2017 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 -131 Cs-134 Cs-137 Ba-140 La-J40 BY-14-1 01/10/17 - 01/10/17 < < <

7 6 12 < 7 < 14 < 8 < JO < 11 < 7 < 7 < 30 < 14 04/11/17 - 04/11/17 < <

7 6 < 10 < 9 < 17 < 8 < 10 < 12 < 7 < 7 < 17 < 9 07/11/17 - 07/11/17 < < <

7 6 17 < 9 < 18 < 9 < 15 < 12 < 8 < 8 < 33 < 10 10/10/17 - 10/10/17 < 11 < <

11 23 < 11 < 24 < 12 < 18 < 13 < 10 < 7 < 41 < 15 MEAN - - - - - - - - -

BY-18-1 01/24/17-01/24/17 <4 <6 <9 <4 <10 <6 <11 <7 <5 <6 <23 <5 04/11/17-04/11/17 <8 <5 <14 <5 <13 <8 <10 <12 <8 <7 <29 <9 07/11/17 - 07/11/17 < 5 < 6 < 13 < 6 < 12 < 7 < 9 < 11 < 7 < 6 < 27 < 10 10/10/17 - 10/10/17 < 8 < 8 < 16 < 9 < 17 < 9 < 14 < 12 < 11 < 8 < 35 <9 MEAN - - -

BY-32 01/10/17 - 01/10/17 < <

8 6 < 13 < 8 < 14 < 6 < 12 < 11 < 5 < 8 < 30 < 10 04/11/17 - 04/11/17 < < <

8 6 11 < 6 < 13 < 8 < 13 < 13 < 8 < 7 < 38 < 12 0 07/11/17 - 07/11/17 < 6 < 8 < 15 < 5 < 11 < < <

8 11 11 < 7 < 7 < 29 < 9 10/10/17 - 10/10/17 < < <

10 10 17 < 9 < 24 < 11 < 17 < 13 < 11 < 10 < 41 < 11 MEAN - - - - - - - -

BY-35 01/17/17 - 01/17/17 < <

7 8 < 14 < 8 < 15 < 6 < JO < 8 < 7 < 6 < 32 < 9 04/11/17 - 04/11/17 < < <

7 7 11 < 8 < 15 < 8 < 10 < 11 < 7 < 7 < 31 < 11 07/11/17 - 07/11/17 < < <

6 7 16 < 10 < 22 < 8 < 8 < 9 < 8 < 8 < 37 < 11 10/10/17 - 10/10/17 < < < <

8 6 14 11 < 15 < 7 < 15 < 9 < 8 < 7 < 39 < 12 MEAN - - - - - - -

BY-37 01/10/17 - 01/10/17 < < <

8 7 18 < 8 < 12 < 8 < 12 < 13 < 8 < 7 < 34 < 14 04/11/17 -04/11/17 <5 <6 <11 <5 <11 <5 <10 <8 <7 <6 <28 <7 07/11/17 - 07/11/17 < 8 < 7 < 15 < 9 < 15 < 8 < 16 < 12 < 6 < 8 < 43 < 12 10/10/17 - 10/10/17 < 7 < 8 < 14 < 8 < 13 < 6 < 12 < 10 < 8 < 7 < 19 < 11 MEAN - - -

BY-38 01/17/17 -01/17/17 <8 <7 <15 <9 <14 <6 <9 <9 <7 <8 <25 <9 04/11/17 - 04/11/17 < <

7 6 < 12 < 5 < 14 < 9 < 11 < 11 < 8 < 4 < 32 < 12 07/11/17-07/11/17 <5 <6 <10 <5 <6 <5 <9 <8 <6 <7 <20 <6 10/10/17-10/10/17 <7 <6 <13 <6 <15 <9 <12 <9 <8 <8 <30 <7 MEAN

Table C-lll.1 CONCENTRATIONS OF NICKEL-63 AND GAMMA EMITTERS IN FISH SAMPLES COLLECTED IN THE VICINITY OF BYRON NUCLEAR GENERATING STATION, 2017 RESULTS 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-i 34 Cs-i 37 Ba-J40 La-i 40 BY-29 FreshwaterDrum 05/25/17 - 05/25/17 < 188 < 69 < 77 < 184 < 80 < 120 < 89 < 149 < 88 < 81 < 463 < 118 Silver Redhorse 05/25/i 7 - < <

05/25/1 7 1 89 55 < 39 < 86 < 38 < 97 < 57 < 72 < 44 < 43 < 265 < 119 FreshwaterDrum 10/26/17 - 10/26/17 < <

53 43 < 29 < 101 < 54 < 107 < 40 < 77 < 50 < 48 < 210 < 66 GoldenRedhorse 10/26/17 - 10/26/17 < <

58 70 < 79 < 154 < 68 < 157 < 79 < 140 < 88 < 79 < 350 < 107 MEAN - - - - -

BY-31 River Carpsucker 05/25/17 - < <

05/25/17 141 55 < 49 < 144 < 63 < I 17 < 52 < I 14 < 66 < 66 < 302 < 82 SilverRedhorse 05/25/17 - 05/25/17 < <

144 69 < 74 < 155 < 69 < 123 < 71 < 116 < 74 < 68 < 427 < 143 Bigmouth Buffalo I 0/26/1 7 - 1 0/26/1 7 < 54 < <

44 32 < 99 < 41 < 99 < 45 < 64 < 44 < 40 < 202 < 75 Common Carp I 0/26/1 7 - 1 0/26/1 7 < < <

53 67 69 < I 36 < 61 < 1 35 < 75 < 1 01 < 78 < 73 < 301 < 85 MEAN

Table C-IV.J CONCENTRATIONS OF NICKEL-63 AND GAMMA EMITTERS IN SEDIMENT SAMPLES COLLECTED IN THE VICINITY OF BYRON NUCLEAR GENERATING STATION, 2017 RESULTS IN UNITS OF PCI/KG DRY +/- 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-12 05/23/17 - 05/23/17 < < <

207 83 81 < 189 < 70 < 181 < 90 < 156 < 102 202 +/- 88 < 416 < 102 10/25/17 - 10/25/17 < < <

168 87 90 < 170 < 82 < 214 < 91 < 141 < 100 < 106 < 381 < 97 MEAN +/- 2 STD DEV 202 +/- 0 -

BY-34 05/23/17 - 05/23/17 < 223 < < <

89 87 191 < 84 < 230 < 99 < 155 < 100 < 116 < 419 < 131 10/25/17 - 10/25/17 < < <

175 41 39 < 86 < 42 < 81 < 46 < 67 < 40 < 38 < 133 < 39 MEAN -

9 THE MEANAND TWO STANDARD DEVIATIONARE CALCULATED USING THE POSITIVE VALUES

Table C-V.J CONCENTRATIONS OF GROSS BETA IN AIR PARTICULATE SAMPLES COLLECTED IN THE VICINITY OF BYRON NUCLEAR GENERATING STATION, 2017 RESULTS IN UNITS OF E-3 PCI/CU METER +/- 2 SIGMA COLLECTION GROUPI I GROUPII I GROUP III PERIOD BY-21 BY-22 BY-23 BY-24 BY-Ol BY-04 BY-06 BY-08 01/03/17 - 01/10/17 24 +/- 5 16 +/- 4 20 +/- 4 23 +/- 5 20 +/- 4 26 +/- 5 24 +/- 5 20 +/- 4 01/10/17 - 01/17/17 23 +/- 5 24 +/- 5 24 +/- 5 22 +/- 4 23 +/- 5 27 +/- 5 20 +/- 4 26 +/- 5 01/17/17 - 01/24/17 22 +/- 5 24 +/- 5 20 +/- 4 21 +/- 5 18 +/- 4 16 +/- 4 18 +/- 4 22 +/- 4 01/24/17 - 01/31/17 16 +/- 4 16 +/- 4 19 +/- 4 20 +/- 4 14 +/- 4 18 +/- 4 17 +/- 4 17 +/- 4 01/31/17 - 02/07/17 16 +/- 4 17 +/- 4 16 +/- 4 16 +/- 4 15 +/- 4 16 +/- 4 15 +/- 4 15 +/- 4 02/07/17 - 02/14/17 16 +/- 4 17 +/- 4 12 +/- 4 19 +/- 4 15 +/- 4 17 +/- 4 15 +/- 4 17 +/- 4 02/14/17 - 02/21/17 16 +/- 4 17 +/- 4 16 +/- 4 18 +/- 4 18 +/- 4 19 +/- 4 17 +/- 4 16 +/- 4 02/21/17 - 02/28/17 12 +/- 4 13 +/- 4 13 +/- 4 12 +/- 4 12 +/- 4 13 +/- 4 11 +/- 4 10 +/- 4 02/28/17 - 03/07/17 18 +/- 4 18 +/- 4 18 +/- 4 17 +/- 4 17 +/- 4 20 +/- 4 16 +/- 4 17 +/- 4 03/07/17 - 03/14/17 9 +/- 4 12 +/- 4 12 +/- 4 10 +/- 4 15 +/- 4 14 +/- 4 11 +/- 4 12 +/- 4 03/14/17 - 03/21/17 17 +/- 4 18 +/- 4 17 +/- 4 19 +/- 4 19 +/- 4 20 +/- 4 18 +/- 4 22 +/- 4 03/21/17 - 03/28/17 13 +/- 4 17 +/- 4 11 +/- 4 16 +/- 4 14 +/- 4 12 +/- 4 12 +/- 4 14 +/- 4 03/28/17 - 04/04/17 11 +/- 4 11 +/- 4 7 +/- 3 11 +/- 4 11 +/- 4 9 +/- 3 11 +/- 4 8 +/- 3 04/04/17 - 04/11/17 15 +/- 4 10 +/- 4 12 +/- 4 12 +/- 4 13 +/- 4 11 +/- 4 12 +/- 4 9 +/- 4 04/11/17 - 04/18/17 11 +/- 4 14 +/- 4 11 +/- 4 15 +/- 4 13 +/- 4 18 +/- 4 13 +/- 4 13 +/- 4 04118117-04125/17 8+/-4 9+/-4 10+/-4 9+/-4 9+/-4 12+/-4 9+/-4 12+/-4 04/25/17 - 05/02/17 < 5 5 +/- 4 < 5 6 +/- 4 6 +/- 4 < 5 < 5 < 5 05/02/17 - 05/09/17 16 +/- 4 16 +/- 4 15 +/- 4 21 +/- 4 17 +/- 4 16 +/- 4 20 +/- 4 16 +/- 4 05/09/17 - 05/16/17 13 +/- 5 18 +/- 5 17 +/- 5 19 +/- 5 17 +/- 5 18 +/- 5 19 +/- 5 21 +/- 5 05/16/17-05/23/17 12+/-4 13+/-4 9+/-3 11+/-4 9+/-3 7+/-3 14+/-4 14+/-4 05/23/17 - 05/30/17 14 +/- 4 13 +/- 4 14 +/- 4 12 +/- 4 15 +/- 4 16 +/- 4 15 +/- 4 16 +/- 4 05/30/17 - 06/06/17 21 +/- 4 19 +/- 4 18 +/- 4 20 +/- 4 20 +/- 4 20 +/- 4 19 +/- 4 19 +/- 4 06/06/17 - 06/13/17 14 +/- 4 15 +/- 4 17 +/- 4 19 +/- 4 15 +/- 4 15 +/- 4 18 +/- 4 16 +/- 4 06/13/17 - 06/20/17 14 +/- 4 11 +/- 4 8 +/- 4 11 +/- 4 11 +/- 4 13 +/- 4 8 +/- 4 12 +/- 4 06/20/17 - 06/27/17 13 +/- 4 8 +/- 4 11 +/- 4 11 +/- 4 13 +/- 4 11 +/- 4 7 +/- 3 12 +/- 4 06/27/17 - 07/03/17 10 +/- 4 12 +/- 4 11 +/- 4 14 +/- 5 11 +/- 4 18 +/- 5 13 +/- 5 13 +/- 4 07/03/17 - 07/11/17 20 +/- 4 20 +/- 4 16 +/- 4 22 +/- 4 23 +/- 4 18 +/- 4 20 +/- 4 16 +/- 4 07/11/17 - 07/18/17 12 +/- 4 12 +/- 4 13 +/- 4 16 +/- 4 12 +/- 4 16 +/- 4 11 +/- 4 15 +/- 4 07/18/17 - 07/25/17 13 +/- 4 17 +/- 4 15 +/- 4 16 +/- 4 16 +/- 4 17 +/- 4 16 +/- 4 19 +/- 4 07/25/17 - 08/01/17 17 +/- 4 15 +/- 4 15 +/- 4 17 +/- 4 18 +/- 4 14 +/- 4 16 +/- 4 14 +/- 4 08/01/17 - 08/08/17 22 +/- 4 22 +/- 4 21 +/- 4 15 +/- 4 16 +/- 4 21 +/- 4 17 +/- 4 21 +/- 4 08/08/17 - 08/16/17 17 +/- 4 21 +/- 4 20 +/- 4 19 +/- 4 22 +/- 4 21 +/- 4 19 +/- 4 23 +/- 4 08/16/17 - 08/22/17 20 +/- 5 21 +/- 5 18 +/- 5 21 +/- 5 23 +/- 5 19 +/- 5 17 +/- 5 18 +/- 5 08/22/17 - 08/29/17 17 +/- 4 17 +/- 4 17 +/- 4 17 +/- 4 18 +/- 4 16 +/- 4 17 +/- 4 19 +/- 4 08/29/17 - 09/05/17 17 +/- 4 14 +/- 4 19 +/- 4 16 +/- 4 16 +/- 4 18 +/- 4 14 +/- 4 17 +/- 4 09/05/17 - 09/12/17 13 +/- 4 16 +/- 4 13 +/- 4 14 +/- 4 14 +/- 4 11 +/- 4 13 +/- 4 14 +/- 4 09/12/17 - 09/19/17 30 +/- 5 28 +/- 5 28 +/- 5 25 +/- 5 22 +/- 5 26 +/- 5 24 +/- 5 30 +/- 5 09/19/17 - 09/26/17 28 +/- 5 28 +/- 5 28 +/- 5 28 +/- 5 25 +/- 5 23 +/- 4 25 +/- 5 31 +/- 5 09/26/17 - 10/03/17 15 +/- 4 13 +/- 4 16 +/- 4 16 +/- 4 15 +/- 4 18 +/- 4 16 +/- 4 21 +/- 4 10103/17-10I10/17 22+/-5 20+/-4 23+/-5 18+/-4 19+/-4 23+/-5 18+/-4 20+/-4 10/10/17 - 10/17/17 13 +/- 4 12 +/- 4 13 +/- 4 8 +/- 4 14 +/- 4 13 +/- 4 13 +/- 4 12 +/- 4 10117/17 - 10/25/17 18 +/- 4 14 +/- 3 16 +/- 4 20 +/- 4 19 +/- 4 15 +/- 4 15 +/- 3 17 +/- 4 10/25/17 - 10/31/17 7 +/- 4 11 +/- 4 7 +/- 4 9 +/- 4 10 +/- 4 10 +/- 4 11 +/- 4 9 +/- 4 10/31/17 - 11/07/17 14 +/- 4 15 +/- 4 15 +/- 4 15 +/- 4 17 +/- 4 16 +/- 4 19 +/- 4 14 +/- 4 11/07/17 - 11/14/17 21 +/- 4 21 +/- 4 21 +/- 4 19 +/- 4 21 +/- 4 17 +/- 4 21 +/- 4 24 +/- 5 11/14/17 - 11/21/17 25 +/- 5 20 +/- 4 20 +/- 4 22 +/- 4 21 +/- 4 22 +/- 4 20 +/- 4 20 +/- 4 11/21/17 - 11/28/17 23 +/- 5 25 +/- 5 22 +/- 5 28 +/- 5 27 +/- 5 23 +/- 5 18 +/- 4 23 +/- 5 11/28/17 - 12/05/17 24 +/- 5 21 +/- 4 23 +/- 4 17 +/- 4 23 +/- 4 23 +/- 4 23 +/- 4 24 +/- 5 12/05/17 - 12/12/17 25 +/- 5 20 +/- 5 17 +/- 4 19 +/- 5 19 +/- 5 16 +/- 4 21 +/- 5 21 +/- 5 12/12/17 - 12/19/17 19 +/- 5 22 +/- 5 18 +/- 5 20 +/- 5 17 +/- 5 21 +/- 5 19 +/- 5 20 +/- 5 12/19/17 - 12/27/17 20 +/- 4 17 +/- 4 17 +/- 4 15 +/- 4 17 +/- 4 19 +/- 4 17 +/- 4 19 +/- 4 12/27/17 - 01/02/18 29 +/- 5 24 +/- 5 26 +/- 5 32 +/- 6 24 +/- 5 26 +/- 5 24 +/- 5 27 +/- 5 MEAN+/-2 STDDEV 17 +/- 11 17 +/- JO 16 +/- JO 17 +/- 11 17 +/- 9 17 +/- 9 16 +/- 9 18 +/- 10 THE MEANAND TWO STANDARD DEWATIONARE CALCULATED USING THE POSITIVE VALUES C-7

Table C-V.2 MONTHLY AND YEARLY MEAN VALUES OF GROSS BETA CONCENTRATIONS IN AIR PARTICULATE SAMPLES COLLECTED IN THE VICINITY OF BYRON NUCLEAR GENERATING STATION, 2017 RESULTS IN UNITS OF E-3 PCI/CU METER +/- 2 SIGMA GROUP -

NEARSITE LOCATIONS GROUP II FAR FIELD LOCATIONS GROUP III - CONTROL LOCATIONS COLLECTION MIN MAX MEAN COLLECTION MIN MAX MEAN COLLECTION MIN MAX MEAN PERIOD +/- 2SD PERIOD +/- 25D PERIOD +/- 25D 01/03/17 - 01/31/17 - -

16 24 21+/-6 01/03/17 01/31/17 14 27 20+/-8 01/03/17 01/31/17 17 26 21+/-8 01/31/17 02/28/17 12 19 16+/-4 01/31/17 02/28/17 11 19 15+/-4 01/31/17 - 02/28/17 10 17 14+/-6 02/28/17 - 04/04/17 - -

7 19 14+/-8 02/28/1 7 04/04/1 7 9 20 15+/-7 02/28/17 04/04/17 8 22 15+/-11 04/04/1 7 05/02/17 5 15 10+/-6 04/04/1 7 05/02/1 7 6 18 12+/-6 04/04/17 - 04/25/17 9 13 11+/-4 05/02/17 - 05/30/1 7 - -

9 21 14+/-6 05/02/17 05/30/17 7 20 15+/-8 05/02/17 05/30/17 14 21 16+/-6 05/30/1 7 07/03/17 8 21 14+/-8 05/30/17 07/03/17 7 20 14+/-8 05/30/17 - 07/03/17 12 19 14+/-6 07/03/17 08/01/17 12 22 16+/-6 07/03/17 08/01/17 11 23 16+/-6 07/03/17 - 08/01/17 14 19 16+/-4 08/01/17 08/29/17 15 22 19+/-4 08/01/17 08/29/17 16 23 19+/-5 08/01/17 - 08/29/17 18 23 20+/-4 08/29/17 - 10/03/17 - -

13 30 20+/-13 08/29/17 10/03/17 11 26 19+/-10 08/29/17 10/03/17 14 31 22+/-15 10/03/17 - 10/31/17 - -

7 23 14+/-10 10/03/17 10/31/17 10 23 15+/-8 10/03/17 10/31/17 9 20 15+/-10 10/31/17 - - -

11/28/17 14 28 20+/-8 10/31/17 11/28/17 16 27 20+/-6 10/31/17 11/28/17 14 24 20+/-9 11/28/17 - - -

Co 01/02/18 15 32 21+/-9 11/28/17 01/02/18 16 26 21+/-6 11/28/17 01/02/18 19 27 22+/-7 01/03/1 7 - - -

01/02/1 8 5 32 17 +/- I0 01/03/17 01/02/18 6 27 17 +/- 9 01/03/17 01/02/18 8 31 18 +/- 10

Table C-V.3 CONCENTRATIONS OF GAMMA EMITTERS IN AIR PARTICULATE SAMPLES COLLECTED IN THE VICINITY OF BYRON NUCLEAR GENERATING STATION, 2017 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-i 34 Cs-i 37 Ba-140 La-i 40 BY-Ol 01/03/1 7 - 04/04/] 7 <3 <4 <11 <2 <6 <4 <8 <3 <2 <164 <62 04/04/17 - 07/03/17 <4 <5 <17 <2 <10 <7 <10 <4 <4 <192 <85 07/03/17 - 10/03/17 <4 <5 <20 <4 <12 <9 <14 <4 <3 <821 <303 10/03/17 - 01/02/18 <2 <2 <7 <2 <5 <3 <6 <2 <2 <123 <45 MEAN BY-04 01/03/1 7 - 04/04/17 <5 <6 <17 <4 <8 <7 <13 <4 <4 <253 <54 04/04/17 - 07/03/17 <3 <5 <14 <2 <8 <4 <6 <3 <3 <91 <78 07/03/17 - 10/03/17 <2 <5 <18 <2 <5 <4 <7 <2 <2 <346 <197 10/03/17 - 01/02/18 <2 <4 <11 <3 <4 <4 <7 <2 <2 <127 <77 MEAN (0 BY-06 01/03/17 - 04/04/17 <2 <4 <9 <1 <6 <4 <5 <2 <2 <164 <47 04/04/17 - 07/03/1 7 <4 <4 <13 <4 <8 <6 <10 <4 <3 <208 <57 07/03/17 - 10/03/17 <2 <3 <14 <2 <5 <4 <8 <3 <2 <421 <234 10/03/17 - 01/02/18 <3 <4 <10 <2 <6 <5 <8 <3 <2 <191 <46 MEAN BY-08 01/03/1 7 - 04/04/17 <3 <4 <12 <3 <4 <5 <6 <2 <2 <149 <97 04/04/17 - 07/03/17 <2 <4 <10 <2 <7 <4 <7 <2 <2 <143 <47 07/03/1 7 - 10/03/17 <3 <5 <17 <2 <8 <6 <11 <3 <3 <421 <196 10/03/17 - 01/02/18 <4 <6 <11 <4 <10 <7 <13 <4 <3 <239 <97 MEAN

Table C-V.3 CONCENTRATIONS OF GAMMA EMITTERS IN AIR PARTICULATE SAMPLES COLLECTED IN THE VICINITY OF BYRON NUCLEAR GENERATING STATION, 2017 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 01/03/1 7 - 04/04/17 <2 <3 <10 <3 <5 <4 <7 <3 <2 <191 <56 04/04/1 7 - 07/03/17 <3 <3 <9 <2 <7 <4 <8 <3 <3 <171 <47 07/03/17 - 10/03/17 <3 <5 <16 <3 <8 <5 <10 <2 <3 <485 <214 10/03/17 - 01/02/18 <2 <4 <8 <3 <5 <3 <7 <3 <2 <105 <54 MEAN BY-22 01/03/1 7 - 04/04/17 <3 <5 <17 <2 <8 <4 <8 <3 <3 <215 <81 04/04/17 - 07/03/17 <3 <5 <14 <4 <7 <5 <9 <3 <3 <184 <44 07/03/17 - 10/03/17 <3 <4 <14 <3 <7 <4 <6 <3 <2 <427 <177 10/03/17 - 01/02/18 <3 <5 <13 <2 <8 <4 <6 <3 <3 <181 <62 MEAN 9

BY-23 01/03/1 7 - 04/04/17 <4 <5 <15 <4 <9 <5 <10 <3 <3 <263 <84 0

04/04/17 - 07/03/17 <3 <3 <10 <2 <5 <4 <6 <2 <2 <134 <40 07/03/17 - 10/03/17 <3 <4 <16 <3 <5 <5 <7 <3 <2 <502 <208 10/03/17 - 01/02/18 <4 <6 <16 <4 <9 <5 <10 <4 <3 <273 <71 MEAN BY-24 01/03/1 7 - 04/04/17 <2 <3 <11 <3 <4 <4 <7 <2 <2 <131 <68 04/04/17 - 07/03/17 <4 <6 <17 <4 <10 <7 <12 <4 <4 <177 <86 07/03/17 - 10/03/17 <4 <8 <22 <4 <9 <8 <14 <4 <4 <685 <252 10/03/17 - 01/02/18 <2 <4 <8 <2 <7 <5 <6 <2 <2 <146 <75 MEAN

Table C-Vl.1 CONCENTRATIONS OF 1-131 IN AIR IODINE SAMPLES COLLECTED IN THE VICINITY OF BYRON NUCLEAR GENERATING STATION, 2017 RESULTS IN UNITS OF E-3 PCI/CU METER +/- 2 SIGMA COLLECTION GROUPI I GROUPIP I GROUP III PERIOD BY-21 BY-22 BY-23 BY-24 BY-Ol BY-04 BY-06 BY-08 01/03/17 01/10/17

- < 58 < 58 < 58 < 58 < 60 < 59 < 58 < 57 01/10/17 01/17/17

- < 44 < 43 < 43 < 43 < 62 < 61 < 62 < 62 01/17/17 01/24/17

- < 55 < 55 < 56 < 56 < 48 < 47 < 47 < 47 01/24/17 01/31/17

- < 44 < 44 < 44 < 44 < 60 < 63 < 62 < 62 01/31/17 02/07/17

- < 41 < 41 < 41 < 41 < 50 < 51 < 51 < 52 02/07/17 02/14/17

- < 61 < 61 < 61 < 62 < 65 < 63 < 63 < 62 02/14/17 02/21/17

- < 54 < 54 < 53 < 53 < 48 < 48 < 48 < 48 02/21/17 02/28/17

- < 53 < 53 < 53 < 53 < 35 < 36 < 36 < 36 02/28/17 03/07/17

- < 68 < 68 < 68 < 68 < 68 < 68 < 69 < 70 03/07/17 03/14/17

- < 46 < 46 < 46 < 47 < 35 < 34 < 34 < 14 03/14/17 03/21/17

- < 47 < 47 < 47 < 47 < 53 < 52 < 52 < 52 03/21/17 03/28/17

- < 54 < 54 < 54 < 55 < 54 < 56 < 56 < 57 03/28/17 04/04/17

- < 50 < 50 < 50 < 50 < 50 < 50 < 50 < 51 04/04/17 04/11/17

- < 46 < 46 < 46 < 46 < 68 < 66 < 66 < 66 04/11/17 04/18/17

- < 44 < 44 < 44 < 44 < 55 < 54 < 54 < 53 04/18/17 04/25/17

- < 47 < 47 < 48 < 21 < 51 < 50 < 51 < 51 04/25/1 7 05/02/1 7

- < 32 < 32 < 32 < 32 < 43 < 44 < 44 < 44 05/02/1 7 05/09/1 7

- < 62 < 62 < 62 < 62 < 54 < 53 < 53 < 53 05/09/1 7 05/1 6/1 7

- < 36 < 36 < I3 < 36 < 35 < 36 < 36 < 36 05/16/17 05/23/17

- < 37 < 37 < 37 < 37 < 44 < 44 < 43 < 16 05/23/17 05/30/17

- < 67 < 67 < 67 < 67 < 50 < 51 < 52 < 52 05/30/17 06/06/17

- < 28 < 28 < 28 < 28 < 47 < 48 < 47 < 47 06/06/17 06/13/17

- < 41 < 41 < 41 < 41 < 47 < 47 < 48 < 48 06/13/17 06/20/17

- < 48 < 47 < 48 < 48 < 55 < 53 < 53 < 52 06/20/17 06/27/17

- < 50 < 50 < 50 < 49 < 47 < 48 < 49 < 49 06/27/17 07/03/17

- < 60 < 60 < 60 < 60 < 61 < 62 < 61 < 60 07/03/17 07/11/17

- < 55 < 55 < 54 < 21 < 61 < 62 < 63 <63 07/11/17 07/18/17

- < 34 < 34 < 34 < 34 < 61 < 59 < 59 <25 07/18/17 07/25/17

- < 46 < 46 < 46 < 46 < 46 < 47 < 47 < 48 07/25/17 08/01/17

- < 49 < 49 < 49 < 49 < 55 < 53 < 53 < 53 08/01/17 08/08/17

- < 48 < 48 < 49 < 49 < 50 < 50 < 51 < 51 08/08/1 7 08/1 6/1 7

- < 62 < 62 < 60 < 60 < 65 < 66 < 65 < 64 08/16/17 08/22/17

- < 52 < 52 < 53 < 52 < 53 < 54 < 54 < 55 08/22/17 08/29/1 7

- < 40 < 40 < 40 < 40 < 46 < 47 < 46 < 45 08/29/1 7 09/05/1 7

- < 54 < 54 < 54 < 23 < 64 < 64 < 64 < 66 09/05/1 7 09/12/1 7

- < 51 < 51 < 51 < 51 < 66 < 64 < 64 < 63 09/12/17 09/19/17

- < 44 < 44 < 43 < 43 < 50 < 51 < 52 < 52 09/19/17 09/26/17

- < 46 < 46 < 46 < 25 < 59 < 59 < 59 < 30 09/26/17 10/03/17

- < 37 < 37 < 20 < 37 < 60 < 25 < 61 < 61 10/03/17 - 10/10/17 < 41 < 41 < 41 < 34 < 42 < 43 < 43 < 43 10/10/17 10/17/17

- < 47 < 47 < 48 < 48 < 57 < 55 < 57 < 57 10/17/17 - 10/25/17 < 26 < 26 < 26 < 26 < 40 < 40 < 39 < 38 10/25/17 10/31/17

- < 51 < 51 < 50 < 50 < 59 < 60 < 61 < 62 10/31/17 - 11/07/17 < 33 < 39 < 39 < 39 < 42 < 42 < 42 <41 11/07/17 - 11/14/17 < 37 < 37 < 37 < 37 < 53 < 54 < 54 <55 11/14/17-11/21/17 <41 <41 <41 <41 <64 <62 <62 <62 11/21/17 - 11/28/17 < 23 < 27 < 27 < 27 < 43 < 43 < 43 <43 11/28/17 12/05/17

- < 37 < 37 < 37 < 37 < 20 < 49 < 49 <49 12/05/17 - 12/12/17 < 58 < 58 < 59 < 59 < 47 < 46 < 45 < 45 12/12/17 12/19/17

- < 44 < 44 < 43 < 43 < 47 < 47 < 47 < 47 12/19/17 - 12/27/17 < 58 < 59 < 59 < 58 < 49 < 48 < 48 < 47 12/27/17 01/02/18

- < 51 < 50 < 50 < 50 < 59 < 61 < 61 < 63 MEAN - - -

C-I I

Table C-Vll.1 CONCENTRATIONS OF 1-131 IN MILK SAMPLES COLLECTED IN THE VICINITY OF BYRON NUCLEAR GENERATING STATION, 2017 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION CONTROL FARM INDICATOR FARM PERIOD BY-26-2 BY-20-J 01/03/17 < 0.7 < 0.8 02/07/17 < 0.5 < 0.5 03/07/17 < 0.8 < 0.7 04/04/17 < 0.6 < 0.7 05/02/17 < 0.8 < 0.7 05/16/17 < 0.9 < 0.9 05/30/17 < 0.5 < 0.4 06/13/17 < 0.9 < 0.5 06/27/17 < 0.6 < 0.6 07/11/17 < 0.6 < 0.7 07/25/17 < 0.7 < 0.8 08/08/17 < 0.9 < 0.4 08/22/17 < 0.8 < 0.5 09/05/17 < 0.6 < 0.5 09/19/17 < 0.4 < 0.4 10/03/17 < 0.9 < 0.5 10/17/17 < 0.4 < 0.7 10/31/17 < 0.8 < 0.8 11/14/17 < 0.3 < 0.6 12/05/17 < 0.7 < 0.8 MEAN - -

C-I 2

Table C-VlI.2 CONCENTRATIONS OF GAMMA EMMITTERS IN MILK SAMPLES COLLECTED IN THE VICINITY OF BYRON NUCLEAR GENERATING STATION, 2017 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 Cs-i 34 Cs-i 37 Ba-i40 La-i 40 BY-20-i 01/03/17 <5 <5 <ii <6 <12 <5 <8 <5 <5 <20 <5 02/07/17 <5 <6 <13 <7 <12 <6 <ii <5 <6 <25 <7 03/07/17 <8 <8 <20 <7 <22 <7 <14 <10 <10 <31 <ii 04/04/17 <7 <7 <16 <9 <18 <8 <16 <7 <8 <31 <8 05/02/17 <6 <7 <15 <7 <16 <6 <12 <7 <7 <28 <9 05/16/17 <6 <6 <ii <6 <ii <5 <9 <6 <6 <20 <7 05/30/17 <7 <9 <17 <7 <21 <9 <16 <ii <8 <42 <7 06/13/17 <10 <9 <21 <8 <22 <8 <15 <9 <10 <39 <9 06/27/17 <10 <9 <21 <10 <17 <10 <19 <ii <8 <35 <12 07/11/17 <5 <6 <16 <8 <17 <6 <13 <7 <7 <30 <6 07/25/17 <7 <8 <20 <7 <20 <8 <14 <9 <9 <37 <8 08/08/17 <8 <7 <19 <7 <19 <8 <15 <8 <9 <30 <8 08/22/17 <7 <8 <17 <8 <18 <8 <14 <8 <8 <33 <8 09/05/17 <7 <8 <18 <7 <17 <8 <15 <9 <9 <36 <9 09/19/17 < 9 < JO < 17 < 10 < 18 < 10 < 15 < 10 < 9 < 44 < 13 10/03/17 <6 <7 <14 <9 <18 <6 <12 <9 <8 <37 <11 10/17/17 <8 <9 <19 <9 <20 <9 <14 <9 <8 <43 <9 10/31/17 <10 <11 <21 <11 <23 <11 <19 <11 <10 <52 <14 Ci3 11/14/17 <5 <6 <12 <6 <16 <7 <9 <6 <5 <24 <5 12/05/17 <6 <6 <14 <6 <14 <7 <9 <6 <7 <24 <6 MEAN - - - -

BY-26-2 01/03/17 < 6 < 7 < 14 < 6 < 16 < 6 < 12 < 6 < 6 < 25 < 10 02/07/17 <6 <6 <13 <6 <13 <6 <10 <5 <6 <25 <7 03/07/17 <8 <8 <20 <10 <18 <8 <14 <11 <9 <38 <8 04/04/17 <5 <7 <15 <7 <17 <7 <10 <9 <8 <30 <8 05/02/17 <9 <9 <24 <7 <22 <8 <16 <8 <9 <46 <11 05/16/17 <8 <7 <17 <7 <17 <8 <15 <8 <8 <30 <8 05/30/17 <8 <8 <18 <10 <15 <8 <13 <7 <8 <36 <10 06/13/17 <7 <8 <16 <7 <18 <7 <12 <8 <7 <31 <8 06/27/17 <10 <10 <23 <10 <19 <8 <17 <11 <12 <41 <14 07/11/17 <9 <8 <22 <11 <17 <11 <18 <8 <9 <50 <10 07/25/17 <11 <10 <23 <10 <22 <10 <18 <12 <11 <38 <11 08/08/17 <7 <7 <15 <7 <15 <7 <9 <8 <6 <26 <8 08/22/17 <6 <6 <16 <7 <13 <6 <10 <7 <7 <29 <8 09/05/17 <8 <8 <18 <9 <20 <8 <15 <10 <9 <39 <10 09/19/17 <8 <10 <22 <10 <21 <11 <18 <9 <11 <49 <15 10/03/17 <9 <9 <20 <10 <24 <11 <18 <10 <10 <44 <12 10/17/17 <8 <8 <19 <9 <23 <8 <14 <9 <9 <38 <13 10/31/17 <7 <6 <18 <8 <16 <7 <12 <7 <7 <38 <10 11/14/17 < 9 < 7 < 14 < 10 < 15 < 8 < 12 < 10 < 8 < 31 < 8 12/05/17 <6 <8 <13 <7 <18 <6 <10 <6 <8 <26 <9 MEAN

Table C-VIIl.1 CONCENTRATIONS OF GAMMA EMITTERS IN VEGETATION SAMPLES COLLECTED IN THE VICINITY OF BYRON NUCLEAR GENERATING STATION, 2017 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 I-13i Cs-134 Cs-137 Ba-140 La-140 BY-CONTROL Lettuce 08/02/1 7 < 30 < 31 < 62 < 36 < 74 < 32 < 54 < 50 < 33 < 29 < 1 50 < 42 Onions 08/02/17 < 29 < 29 < 66 < 27 < 58 < 33 < 50 < 53 < 33 < 38 < 148 < 35 MEAN BY-QUAD 1 Cabbage 08/02/1 7 < 28 < 32 < 47 < 30 < 78 < 37 < 57 < 57 < 38 < 35 < 1 57 < 44 Potatoes 08/02/17 < 24 < 25 < 46 < 18 < 47 < 25 < 40 < 41 < 29 < 27 < 114 < 29 MEAN 0 BY-QUAD 2 Beet greens 08/02/1 7 39 < 47 < 92 < 34 < 78 < 38 < 70 < 57 < 47 < 36 < 150 < 56 Beets 08/02/17 < 39 < 39 < 86 < 36 < 74 < 36 < 62 < 57 < 41 < 34 < 157 < 52 Onions 08/02/17 < 31 < 29 < 70 < 31 < 73 < 33 < 57 < 57 < 32 < 33 < 174 < 52 MEAN BY-QUAD 3 Carrots/Kohlrabi 08/02/17 < 23 < 25 < 56 < 22 < 64 < 29 < 46 < 43 < 31 < 24 < 128 < 29 Lettuce 08/02/17 < 34 < 31 < 60 < 31 < 69 < 39 < 48 < 55 < 32 < 34 < 147 < 49 MEAN BY-QUAD 4 Kale 08/02/17 < 31 < 33 < 70 < 42 < 68 < 43 < 59 < 59 < 42 < 41 < 160 < 50 Potatoes 08/02/17 < 31 < 35 < 69 < 32 < 86 < 37 < 64 < 59 < 33 < 33 < 181 < 41 MEAN

Table C-IX.1 QUARTERLY OSLD RESULTS FOR BYRON NUCLEAR GENERATING STATION, 2017 RESULTS IN UNITS OF MREM/QUARTER +/- 2 STANDARD DEVIATIONS STATION MEAN CODE +/- 2 S.D. JAN MAR

- APR JUN

- JUL SEP

- OCT DEC BY-OJ-J 21 +/- 3 19 20 22 22 BY-O1-2 20 +/- 4 18 21 22 19 BY-04-1 24 +/- 4 22 24 27 23 BY-04-2 23 +/- 2 23 22 24 22 BY-06-1 21 +/- 5 19 19 23 24 BY-06-2 20 +/- 5 17 21 21 22 BY-21-1 18 +/- 2 17 19 19 19 BY-21-2 19 +/- 5 16 20 21 20 BY-22-1 25 +/- 4 22 25 27 25 BY-22-2 24 +/- 6 21 23 28 23 BY-23-1 25 +/- 5 22 24 28 25 BY-23-2 24 +/- 5 21 22 27 24 BY-24-1 22 +/- 6 19 20 26 22 BY-24-2 23 +/- 5 19 22 25 24 BY-JOJ-1 19 +/- 3 17 19 21 19 BY-101-2 18 +/- 5 15 18 21 20 BY-102-1 25 +/- 6 22 24 29 24 BY-102-2 26 +/- 5 23 24 29 27 BY-103-1 24 +/- 5 21 24 27 26 BY-i 03-2 25 +/- 2 24 25 27 25 BY-103-3 24 +/- 3 22 24 25 24 BY-I 04-1 26 +/- 4 23 25 28 27 BY-104-2 25 +/- 7 21 24 29 27 BY-104-3 24 +/- 3 23 23 25 25 BY-105-1 26 +/- 4 24 23 27 28 BY-105-2 27 +/- 7 23 27 31 25 BY-106-i 26 +/- 4 24 26 28 25 BY-106-2 24 +/- 7 20 22 26 27 BY-107-i 26 +/- 3 24 25 27 28 BY-107-2 27 +/- 6 24 26 31 27 BY-107-3 22 +/- 3 20 22 23 24 BY-108-1 25 +/- 5 22 27 27 25 BY-108-2 23 +/- 4 21 21 25 24 BY-109-1 23 +/- 3 21 22 24 24 BY-109-2 24 +/- 4 23 22 27 23 BY-lb-I 23 +/- 3 21 23 23 25 BY-1i0-2 23 +/- 2 23 23 25 22 BY-1Ji-3 25 +/- 6 21 23 28 27 BY-1Ii-4 24 +/- 3 23 23 25 25 BY-112-3 24 +/- 5 22 22 27 24 BY-112-4 25 +/- 4 22 25 26 26 BY-113-i 24 +/- 5 22 25 27 23 BY-113-2 22 +/- 4 20 21 25 23 BY-114-I 21 +/- 5 18 22 22 23 BY-114-2 23 +/- 5 20 22 26 24 BY-115-1 24 +/- 4 22 24 26 26 BY-115-2 22 +/- 5 19 22 25 24 BY-116-i 22 +/- 4 20 21 24 21 BY-116-2 21 +/- 4 19 22 23 22 C-I 5

Table C-IX.1 QUARTERLY OSLD RESULTS FOR BYRON NUCLEAR GENERATING STATION, 2017 RESULTS IN UNITS OF MREM/QUARTER +/- 2 STANDARD DEVIATIONS STATION MEAN CODE +/- 2 S.D. JAN - MAR APR JUN

- JUL SEP

- OCT DEC BY-116-3 22 +/- 3 20 23 23 23 BY-201-3 25 +/- 4 23 24 27 27 BY-201-4 25 +/- 5 23 23 28 26 BY-202-J 23 +/- 2 21 23 23 24 BY-202-2 26 +/- 5 23 24 29 26 BY-203-1 21 +/- 6 17 20 24 22 BY-203-2 23 +/- 4 21 22 24 24 BY-204-1 22 +/- 5 19 21 25 23 BY-204-2 26 +/- 4 23 27 27 25 BY-205-1 26 +/- 5 23 25 26 29 BY-205-2 23 +/- 5 20 23 25 23 BY-206-1 25 +/- 5 23 25 29 26 BY-206-2 26 +/- 5 23 25 28 28 BY-207-1 27 +/- 6 25 25 31 29 BY-207-2 25 +/- 5 22 24 28 25 BY-208-1 27 +/- 6 24 25 30 30 BY-208-2 26 +/- 4 23 26 27 28 BY-209-J 26 +/- 5 23 24 28 28 BY-209-4 26 +/- 5 24 24 29 27 BY-210-3 24 +/- 6 21 23 27 27 BY-210-4 24 +/- 3 21 23 25 25 BY-211-J 25 +/- 4 23 24 27 26 BY-211-4 26 +/- 4 23 28 28 26 BY-212-1 25 +/- 7 22 23 29 26 BY-212-4 27 +/- 8 22 26 31 30 BY-2J3-1 25 +/- 4 23 25 27 27 BY-2J 3-4 25 +/- 6 22 24 29 27 BY-214-1 25 +/- 4 23 24 28 24 BY-214-4 26 +/- 4 24 25 28 27 BY-215-1 26 +/- 4 23 25 27 28 BY-215-4 27 +/- 3 26 25 29 27 BY-216-1 27 +/- 5 23 26 29 29 BY-216-2 26 +/- 6 21 26 29 27 BY-301-1 19 +/- 4 17 18 21 21 BY-301-2 21 +/- 5 18 20 24 21 BY-309-1 24 +/- 5 22 23 27 23 BY-309-2 24 +/- 4 22 24 26 24 BY-309-3 22 +/- 4 20 21 25 21 BY-309-4 21 +/- 4 19 21 24 19 BY-314-2 20 +/- 3 18 19 21 21 BY-08-1 (CtrI) 22 +/- 4 19 21 23 23 BY-08-2 (CtrI) 21 +/- 6 19 18 25 21 C-16

TABLE C-IX.2 MEAN QUARTERLY OSLD RESULTS FOR THE INNER RING, OUTER RING, SPECIAL INTEREST, OTHER, AND CONTROL LOCATIONS FOR BYRON NUCLEAR GENERATING STATION, 2017 RESULTS IN UNITS OF MILLIREM/STD. QUARTER +/- 2 STANDARD DEVIATION COLLECTION INNER RING OUTER RING SPECIAL INTEREST OTHER CONTROL PERIOD +/- 2 S.D. +/- 2 S.D. +/- 2 S.D. +/- 2 S.D. +/- 2 S.D.

JAN-MAR 21 +/- 4 22 +/- 3 19 +/- 4 20 +/- 4 19 +/- 0 APR-JUN 23 +/- 4 24 +/- 3 21 +/- 4 21 +/- 4 20 +/- 4 JUL-SEP 26 +/- 5 28 +/- 4 24 +/- 4 24 +/- 6 24 +/- 3 OCT-DEC 24 +/- 4 26 +/- 4 21 +/- 3 22 +/- 4 22 +/- 3 TABLE C-IX.3

SUMMARY

OF THE AMBIENT DOSIMETRY PROGRAM FOR BYRON NUCLEAR GENERATING STATION, 2017 RESULTS IN UNITS OF MILLIREM/STD. QUARTER +/- 2 STANDARD DEVIATION SAMPLES PERIOD PERIOD PERIOD MEAN LOCATION ANALYZED MINIMUM MAXIMUM +/-2 SD.

INNER RING 144 15 31 24 +/- 5 OUTER RING 128 17 31 25+/-5 SPECIAL INTEREST 28 17 27 21+/-5 OTHER 56 16 28 22+/-6 CONTROL 8 18 25 21+/-5 INNER RING STATIONS BY-1O1-1, BY-1O1-2, 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-hO-I, BY-11O-2, BY-I I 1-3, BY-l 1 1-4, BY-I 12-3, BY-1 12-4, BY-I I 3-I BY-I I 3-2, BY-I 14-I BY-l 14-2, BY-l I 5-I BY-I 15-2, BY-I 16-I BY-I 16-2, BY-I 16-3 OUTER RING STATIONS BY-201-3, BY-201-4, BY-202-I BY-202-2, BY-203-I BY-203-2, BY-204-I BY-204-2, BY-205-I BY-205-2, I ,

BY-206-2, BY-207-I BY-207-2, ,

8, BY-208-2, BY-209-4, BY-2I0-3, BY-2I0-4, BY-2I , BY-2I 1-4, BY-2I2-I, BY-2I2-4, BY-2I3-l, BY-2I3-4, BY-2I4-I, BY-2I4-4, BY-2I5-I, BY-2I5-4, BY-2I6-I, BY-2I6-2 SPECIAL INTEREST STATIONS BY-301-I BY-30I-2, BY3O9I*, BY3O92*, BY3O93*, BY3O94*, BY-3I4-2 OTHER STATIONS BY-OI-I, BY-OI-2, BY-04-I, BY-04-2, BY-06-I, BY-06-2, BY-2I-I, BY-2I-2, BY-22-l, BY-22-2, BY-23-I, BY-23-2,

, BY-24-2 CONTROL STATIONS BY-08-I BY-08-2 ,

FQr ISFSI Monitoring

FIGURE C-I Surface Water Gross Beta Stations BY-I 2 and BY-29 (C)

Collected in the Vicinity of BNGS, 2000 2017 -

BY-12 Oregon Pool of Rock River, Downstream 10.0 8.0 6.0

-I 0

0.

4.0 2.0 0.0 01-25-00 07-19-04 01-11-09 07-06-13 12-29-17 BY-29 (C) Byron, Rock River Upstream 14.0 12.0 10.0

-I 8.0 0

0. 6.0 4.0 2.0 0.0 01-25-00 07-1 9-04 01 -1 1 -09 07-06-1 3 12-29-17 DUE TO VENDOR CHANGE IN 2005, < VALUES ARE LLD VALUES JANUARY THROUGH JUNE 2005 AND MDC VALUES AFTER JUNE 2005 C-I 8

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

Collected in the Vicinity of BNGS, 2000 2017 -

BY-I 2 Oregon Pool of Rock River, Downstream 10000 I 000

-I 0

0.

I 00 10 03-28-00 09-04-04 02-1 1-09 07-21-13 12-28-17 BY-29 (C) Byron, Rock River Upstream 250 200 ISO

.1 0

100 SO 0

03-28-00 09-04-04 02-11-09 07-21-13 12-28-17 DUE TO VENDOR CHANGE IN 2005, < VALUES ARE LLD VALUES JANUARY THROUGH JUNE 2005 AND MDC VALUESAFTER JUNE 2005 C-I 9

FIGURE C-3 Ground Water Tritium Station BY-14-1 Collected in the Vicinity of BNGS, 2000 2017 -

BY-14-1 3200 N. German Church Road Well 250 200 I 50 0

I 00 50 0

01 00 06-28-04 12-21 -08 06-1 5-1 3 12-08-17 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 Stations BY-I 8-I Collected in the Vicinity of BNGS, 2010 2017 -

BY-18-1 Calhoun Well 250 100 50 0

07-01-10 05-11-12 03-22-14 01-31-16 12-11-17 C-21

FIGURE C-5 Ground Water Tritium Station BY-32 Collected in the Vicinity of BNGS, 2000 2017 -

BY-32 Krueger Well 250 200 150

-I 0

100 50 0

01-01-00 07-01-04 01-01-09 07-01-13 01-01-18 C-22

FIGURE C-6 Ground Water Tritium Station BY-35 Collected in the Vicinity of BNGS, 2006 2017 -

BY-35 Vancko Well 250 200 150

-J 0

0.

50 0

04-01-06 03-01-09 02-01-12 01-01-15 12-01-17 C-23

FIGURE C-f Ground Water Tritium Station BY-37 Collected in the Vicinity of BNGS, 2006 2017 -

BY-37 Kavage Well 250 200 150

-J 0

0.

I 00 50 0

04-01 -06 03-01 -09 02-01 -12 01 1 5 12-01-17 Ground Water Tritium Station BY-38 Collected in the Vicinity of BNGS, 2006 2017 -

BY-38 Steve Storz Well 250 200 150 0

0.

I 00 50 0

07-13-15 12-06-1 5 04-30-1 6 09-23-16 02-1 6-1 7 07-1 2-1 7 12-05-17 C-24

FIGURE C-8 Air Particulate Gross Beta Stations EY-08 (C) and BY-21 Collected in the Vicinity of BNGS, 2000 2017 -

BY-08 (C) Leaf River WNW 60.0 50.0 c) 40.0 E

0 30.0 c) 0 w

0 20.0 10.0 0.0 01-04-00 08-1 1 -03 03-1 8-07 1 0-23-1 0 05-30-1 4 01-04-18 BY-21 Byron Nearsite N 60.0 50.0 40.0 E

0 30.0 0

w 0 20.0 10.0 0.0 01-04-00 08-1 1-03 03-18-07 10-23-10 05-30-14 01-04-18 C-25

FIGURE C-9 Air Particulate Gross Beta Stations BY-22 and EY-23 Collected in the Vicinity of BNGS, 2000 2017 -

BY-22 Byron Nearsite SE 60.0 50.0 40.0 0

0 30.0 0

w 20.0 10.0 0.0 01-04-00 08-1 1-03 03-18-07 10-23-10 05-30-14 01-04-18 BY-23 Byron Nearsite S 60.0 50.0 40.0 0

30.0 c) 0 w

20.0 10.0 0.0 01-04-00 08-11-03 03-18-07 10-23-10 05-30-14 01-04-18 C-26

FIGURE C-JO Air Particulate Gross Beta Stations BY-24 Collected in the Vicinity of BNGS, 2000 20J7 -

BY-24 Byron Nearsite SW 70.0 60.0 50.0 C)

E 40.0 C) 9 30.0 w

C 20.0 10.0 0.0 01-04-00 08-1 1-03 03-18-07 10-23-10 05-30-14 01-04-18 C-27

FIGURE C-lI Air Particulate Gross Beta Stations BY-Ol and EY-04 Collected in the Vicinity of BNGS, 2005 2017 -

BY-Ol Byron N 60.0 50.0 c) 40.0 E

0

0. 30.0 0

w 0 20.0 10.0 0.0 07-05-05 08-05-07 09-04-09 10-05-1 1 1 1-04-13 12-05-15 01-04-18 BY-04 Paynes Point SE 60.0 50.0 c) 40.0 E

0

0. 30.0 c) 0 w

0 20.0 10.0 0.0 07-05-05 08-05-07 09-04-09 10-05-1 1 1 1-04-13 12-05-15 01-04-18 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 BNGS, 2005 2017 -

BY-06 Oregon SSW 60.0 50.0 c) 40.0 E

0 30.0 c) 0 w

0 20.0 10.0 0.0 07-05-05 08-05-07 09-04-09 10-05-1 1 1 1-04-13 12-05-15 01-04-18 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

Intenfionally left blank TABLE D.J Analytics Environmental Radioactivity Cross Check Program Teledyne Brown Enqineerina. 2017 TEE Identification . Known Ratio of TEE to Month/Year Matrix Nuclide Units Reported (a)

Evaluation b Number Value Analytics Result Value March 2017 E11811 Milk Sr-89 pCi/L 87 977 0.89 A Sr-90 pCi/L 12.4 16.2 0.77 W E11812 Milk Ce-141 pCi/L 135 145 0.93 A Co-58 pCi/L I 53 1 50 1 .02 A Co-60 pCi/L I 82 1 83 1 .00 A Cr-51 pCi/L 258 290 0.89 A Cs-134 pCi/L 104 120 0.87 A Cs-137 pCi/L 142 140 1.02 A Fe-59 pCi/L 135 129 1.05 A

-131 pCi/L 92.6 97.9 095 A Mn-54 pCi/L 173 164 1 .05 A Zn-65 pCi/L 208 199 1.04 A E11813 Charcoal 1-131 pCi 92 93.9 0.98 A E11814 AP Ce-141 pCi 99.9 101 0.99 A Co-58 pCi 95.4 104 0.92 A Co-60 pCi 140 127 1.10 A Cr-51 pCi 211 201 1.05 A Cs-134 pCi 82.1 83.2 099 A Cs-137 pCi 92.8 97.0 0.96 A Fe-59 pCi I 07 89.3 1 .20 A Mn-54 pCi 106 114 0.93 A Zn-65 pCi 137 138 0.99 A E11816 Soil Ce-141 pCi/g 0.258 0250 1.03 A Co-58 pCilg 0.241 0.258 0.93 A Co-60 pCi/g 0.312 0.315 0.99 A Cr-51 pCilg 0.439 0.500 0.88 A Cs-134 pCilg 0.176 0.207 0.85 A Cs-137 pCilg 0.304 0.317 0.96 A Fe-59 pCi/g 0.210 0.222 0.95 A Mn-54 pCi/g 0.292 0.283 1.03 A Zn-65 pCi/g 0.353 0.344 1.03 A E11815 Water Fe-55 pCi/L 1600 1890 0.85 A (a) The Analytics known value is equal to 700% 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 0.80-7.20 w = Acceptable with warning reported result falls within 0. 70-0.80 or 7.20-7.30 N = NotAcceptable reported result falls outside the ratio limits of < 0. 70 and > 7.30 (Page 1 of 4)

D-1

TABLE D.J Analytics Environmental Radioactivity Cross Check Program Teledyne Brown Engineering, 2017 TEE Identification . . Ratio of TBE to Month/Year Matrix Nuclide Units Reported (a) Evaluation (b)

Number Value Analytics Result June2017 E11844 Milk Sr-89 pCi/L 81.3 92.6 0.88 A Sr-90 pCi/L 12.1 13.5 0.90 A E11846 Milk Ce-141 pCi/L 142 151 0.94 A Co-58 pCi/L 147 155 0.95 A Co-60 pCi/L 185 191 0.97 A Cr-51 pCi/L 321 315 1.02 A Cs-134 pCi/L 168 188 0.89 A Cs-137 pCi/L 148 150 0.99 A Fe-59 pCi/L 116 115 1.01 A

-131 pCi/L 102 93.6 1.09 A Mn-54 pCi/L 168 172 0.98 A Zn-65 pCi/L 195 204 0.96 A E11847 Charcoal 1-131 pCi 87.9 84.8 1.04 A E11845 AP Sr-89 pCi 70.8 79.1 090 A Sr-90 pCi 9.10 11.5 0.79 W E11848 AP Ce-141 pCi 112 116 0.96 A Co-58 pCi 119 119 1.00 A Co-60 pCi 171 146 1.17 A Cr-51 pCi 270 241 1.12 A Cs-I 34 pCi I 52 144 1.05 A Cs-137 pCi 114 115 0.99 A Fe-59 pCi 94.1 88.3 1.07 A Mn-54 pCi 139 132 1.06 A Zn-65 pCi 141 156 090 A E11849 Water Fe-55 pCi/L 1840 1890 0.97 A July2017 E11901 AP GR-A pCi 50.1 44.2 1.13 A GR-B pCi 218 233 0.93 A (a) The Analytics known value is equal to 700% 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 0.80-720 w = Acceptable with warning reported result falls within 0. 70-0.80 or 7.20-7.30 N = NotAcceptable reported result falls outside the ratio limits of < 0. 70 and > 7.30 (Page2 of 4)

D-2

TABLE D.1 Analytics Environmental Radioactivity Cross Check Program Teledyne Brown Engineering, 2017 IBE Identification Known Ratio of TBE to Month/Year Matrix Nuclide Units Reported Evaluation (b)

Number Value Value (a) Analytics Result September2017 E11914 Milk Sr-89 pCi/L 84.3 82.7 1.02 A Sr-90 pCi/L 12.6 12.1 1.04 A E11915 Milk Ce-141 pCi/L 93.9 87.0 1.08 A Co-58 pCiIL 115 117 0.98 A Co-60 pCi/L 265 262 1 .01 A Cr-51 pCi/L 273 217 1.26 W Cs-134 pCiIL 186 201 0.93 A Cs-137 pCiIL 175 172 1.02 A Fe-59 pCi/L 137 125 1.09 A

-131 pCiIL 78.0 71.0 1.10 A Mn-54 pCi/L 128 123 1 .04 A Zn-65 pCiIL 206 1 84 1 I2

. A E11916 Charcoal -131 pCi 71.9 64.4 1.12 A E11917 AP Ce-141 pCi 80.1 86.3 0.93 A Co-58 pCi 110 116 0.95 A Co-60 pCi 277 260 1 .07 A Cr-51 pCi 275 215 1.28 W Cs-134 pCi 192 199 0.96 A Cs-137 pCi 165 170 0.97 A Fe-59 pCi 122 124 0.98 A Mn-54 pCi 120 122 0.99 A Zn-65 pCi 175 183 0.96 A E11918 Water Fe-55 pCi/L 1630 1630 1.00 A E11919 Soil Ce-141 pCi/g 0.136 0.142 0.96 A Co-58 pCi/g 0.179 0.191 0.94 A Co-60 pCi/g 0.405 0.429 0.94 A Cr-51 pCi/g 0.230 0.355 0.65 N (1)

Cs-134 pCi/g 0.272 0.328 0.83 A Cs-137 pCi/g 0.336 0.356 0.94 A Fe-59 pCi/g 0.210 0.205 102 A Mn-54 pCi/g 0.210 0.201 1.05 A Zn-65 pCi/g 0.301 0.301 1.00 A (a) The Analytics known value is equal to 700% 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 0.80-7.20 w = Acceptable with warning reported result falls within 0. 70-0.80 or 1.20-7.30 N = NotAcceptable reported result falls outside the ratio limits of < 0. 70 and > 7.30 (7) SeeNCRI7-16 (Page 3 of 4)

D-3

TABLE D.1 Analytics Environmental Radioactivity Cross Check Program Teledyne Brown Engineering, 2017 TBE Identification . Known Ratio of IBE to Month/Year Matrix Nuclide Units Reported (a) Evaluation (b Number Value Analytics Result Value December2017 E12054 Milk Sr-89 pCi/L 92.1 92.3 1.00 A Sr-90 pCi/L 18.3 16.9 1.09 A E12055 Milk Ce-141 pCi/L 97.8 98.3 0.99 A Co-58 pCi/L 92.3 89.9 1.03 A Co-60 pCi/L I 76 1 73 1 .02 A Cr-51 pCi/L 226 242 0.93 A Cs-134 pCi/L 118 125 0.95 A Cs-137 pCi/L 148 141 1.05 A Fe-59 pCi/L 123 113 1.08 A

-131 pCi/L 66.0 57.8 114 A Mn-54 pCi/L 173 161 108 A Zn-65 pCi/L 233 211 1.10 A E12056 Charcoal 1-131 pCi 48.1 47.5 1.01 A E12057A AP Ce-141 pCi 108 111 097 A Co-58 pCi 89.5 102 0.88 A Co-60 pCi 223 196 1.14 A Cr-51 pCi 311 274 1.13 A Cs-134 pCi 141 142 1.00 A Cs-137 pCi 162 160 101 A Fe-59 pCi 121 129 0.94 A Mn-54 pCi 177 182 0.97 A Zn-65 pCi 203 239 0.85 A E12058 Water Fe-55 pCi/L 1970 1740 1.13 A E12059 AP Sr-89 pCi 71.2 87.4 0.81 A Sr-90 pCi 12.9 16.0 0.81 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 = NotAcceptable reported result falls outside the ratio limits of < 0. 70 and > 1.30 (Page 4 of 4)

D-4

TABLE D2 DOEs Mixed Analyte Performance Evaluation Program (MAPEP)

Teledyne Brown Engineering, 2017 TBE ldentfication Known Acceptance Month/Year Matrix Nuclide Units Reported (a)

Evaluation b Number Value Range Value February 2017 17-MaS36 Soil Ni-63 Bq/kg -5.512 (1) A Sr-90 Eq/kg 571 624 437 81 1- A I 7-MaW36 Water Am-241 Bq/L 0.693 0.846 0.592 - I I 00

. A Ni-63 Bq/L 13.4 12.2 8.5-15.9 A Pu-238 Eq/L 0.7217 0703 0.492 0.914- A Pu-239/240 Bq/L 0.9277 0.934 0654 - 1.214 A 1Z-RdF36 AP U-234/233 Eq/sample 0.091 1 0.104 0.073 0.135- A U-238 Eq/sample 00967 0107 0.075 0.139- A 1Z-RUV36 Vegetation Cs-134 Eq/sample 6.44 6.95 487 9.04 - A Cs-137 Eq/sample 461 4.60 3.22 - 5.98 A Co-57 Eq/sample -0.0229 (7) A Co-60 Eq/sample 8.52 8.75 6. 1 3 - 1 1 .38 A Mn-54 Eq/sample 3.30 3.28 2.30 4.26- A Sr-90 Eq/sample I .30 1 .75 1 .23 2.28

- W Zn-65 Eq/sample 5.45 5.39 3.77 7.01- A August 2017 1Z-Ma537 Soil Ni-63 Eq/kg I 130 1220 854 - 1586 A Sr-90 Eq/kg 296 289 202 376- A 17-MaW37 Water Am-241 Eq/L 0838 0892 0.624 - 1.160 A Ni-63 Eq/L -0096 (1) A Pu-238 Eq/L 0.572 0.603 0.422 0.784

- A Pu-239/240 Eq/L 0.863 0.781 0.547 - 1.015 A 17-RUF3Z AP U-234/233 Eq/sample 0.103 0.084 0059 0.109- W U-238 Eq/sample 0.115 0087 0.061-0.113 N2 17-RUV3Z Vegetation Cs-134 Eq/sample 2.34 2.32 1.62 - 302 A Cs-137 Eq/sample 0.05 (1) A Co-57 Eq/sample 3.32 2.8 2.0 - 3.6 A Co-60 Eq/sample 2.09 2.07 1.45 2.69

- A Mn-54 Eq/sample 2.90 2.62 1.83 3.41

- A Sr-90 Eq/sample I I7

. 1 .23 0.86 - I .60 A Zn-65 Eq/sample 6.07 5.37 3.76 6.98- A (a) The MAPEP known value is equalto 100% of the parameter present in the standard as determined by gravimetric and/or volumetric measurements made during standard preparation (b) DOEIMAPEP evaluation:

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 = NotAcceptable reported result falls outside the ratio limits of < 0. 70 and > 1.30 (1) False positive test (2) SeeNCRI7-15 (Page 1 of 1)

D-5

TABLE D.3 ERA Environmental Radioactivity Cross Check Program Teledyne Brown Engineering, 2017 TBE Identrification . . Known Acceptance Month/Year Matrix Nuclide Units Reported (b)

Evaluation Number Value Value (a) Limits March 2017 MRAD-26 AP GR-A pCi/sample 76.3 85.5 28.6 - 133 A April 2017 RAD-109 Water Ba-133 pCiIL 49.2 49.7 40.8 - 55.1 A Cs-134 pCi/L 83.2 90.1 74.0 - 99.1 A Cs-137 pCiIL 202 206 185 - 228 A Co-60 pCiIL 51 .2 54.7 49.2 - 62.7 A Zn-65 pCiIL 39.3 53.8 47.2 - 65.9 N (1)

GR-A pCi/L 53.6 75.0 39.5 - 92.3 A GR-B pCi/L 42.7 38.5 25.5 - 46.0 A U-Nat pCi/L 50.1 55.6 45.2 - 61 .7 A H-3 pCi/L 7080 6850 5920 - 7540 A Sr-89 pCi/L 40.7 66.2 53.8 74.3

- N (1)

Sr-90 pCiIL 26.9 26.7 19.3 31.1

- A

-131 pCiIL 26.7 29.9 24.9 34.9

- A September2017 MRAD-27 AP GR-A pCi/sample 40.9 50.1 16.8 77.8

- A AP GR-B pCi/sample 58.0 61.8 39.1 -90.1 A October2017 RAD-Ill Water Ba-133 pCiIL 71.3 73.7 61.7 81.1

- A Cs-134 pCi/L 43.0 53.0 42.8 58.3

- A Cs-137 pCi/L 48.2 52.9 47.6 61.1

- A Co-60 pCiIL 69.0 69.5 62.6 78.9

- A Zn-65 pCiIL 335 348 31 3 406

- A GR-A pCi/L 32.5 35.6 18.3-45.8 A GR-B pCi/L 24.3 25.6 16.0 33.6

- A U-Nat pCi/L 36.6 37.0 30.0 40.9

- A H-3 pCi/L 6270 6250 5390 6880

- A 1-131 pCiIL 26.4 24.2 20.1 -28.7 A November2017 1113170 Water Sr-89 pCi/L 57.1 50.0 39.4 57.5

- A (2)

Sr-90 pCi/L 27.1 41 .8 30.8 48.0

- N (a) The ERA known value is equal to 700% 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 = NotAcceptable Reported value falls outside ofthe Acceptance Limits (1) See NCR 17-09 (2) SeeNCRI7-19 (Pagel ofl)

D-6

APPENDIX E EFFLUENT REPORT

Intentionally left blank TABLE OF CONTENTS

SUMMARY

i INTRODUCTION 2 1.0. EFFLUENTS 3 I I Gaseous Effluents to the Atmosphere

. . 3 I .2. Liquids Released to Rock River 3 2.0. SOLID RADIOACTIVE WASTE 4 3.0. DOSETOMAN 4

3. 1 Gaseous Effluent Pathways

. 4 3.1.1. NobleGases 4 3.1 .1 I Gamma Dose Rates

. . 4 3.1.1.2. Beta Air and Skin Dose Rate 4

3. 1 .2. Radioactive Iodine & Particulate 5 3.1 .3. Gaseous Total Dose 5 3.2. Liquid Effluent Pathways 6 3.3. Total Dose 6 3.4. Assessment of Dose to Member of Public 6 4.0. SITEMETEOROLOGY 7

Table of Contents (cant.)

APPENDIX E-1 DATA TABLES AND FIGURES Station Releases Table 1.1-1 Gaseous Effluents E-1-1 Table 1.2-1 Liquid Effluents E-J-3 Table 3.1-1 4OCFRI9O Maximum Doses Resulting from Liquid Releases E-1-5 Table 3.2-1 4OCFRI9O Maximum Doses Resulting from Gaseous Releases.. E-1-7 Table 3.3-1 4OCFRI9O Uranium Fuel Cycle Report Total Dose E-J-9 Table 3.4-1 Maximum Doses Resulting from Airborne Releases Based On Concurrent Meteorological Data E-J-11

SUMMARY

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

The Total Effective Dose Equivalent (TEDE) due to licensed activities at Byron Station calculated for the maximum exposed individual for the period is 2.56E-O1 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 IOCFR5O Appendix I, IOCFR2O and 4OCFRI9O.

There were no additional operational controls implemented which affected the areas of radiological effluents in 2017.

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 Station.

INTRODUCTION Liquid effluents from Byron Station 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 particulate radioactivity sampled during the course of the year. The results of effluent analyses are summarized on a monthly basis. Airborne concentrations of noble gases, I-I 31 and ,

particulate radioactivity in offsite areas are calculated using isotopic composition of effluents and meteorological data. 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 Station 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 201 7 gaseous dose was vegetation. The critical pathway for 2017 liquid dose was freshwater fish.

to EFFLUENTS I I. 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 1.1-1.

A total of 8.90E-O1 curies of fission and activation gases were released with a maximum average quarterly release rate of 3.87E-02 pCi/sec.

A total of I .55E-06 curies of 1-1 31 were released during the year with a maximum average quarterly release rate of I 99E-O7 pCi/sec.

A total of 2.39E-06 curies were released as airborne particulate matter with a maximum average quarterly release rate of 3.01 E-07 pCi/sec.

A total of 8.39E÷OO curies of other (C-14) radioisotopes were released with a maximum average quarterly release rate of 2.87E-O1 pCi/sec.

A total of 3.96E+O1 curies of tritium were released with a maximum average quarterly release rate of I .44E+OO pCi/sec.

Gross alpha-emitting radionuclides were below detectable limits.

I .2 Liquids Released to Rock River A total of 2.82E÷1O liters of radioactive liquid wastes containing I .84E-02 curies of fission and activation products were discharged with a maximum quarterly average concentration of I .20E-09 pCi/mI.

A total of I .98E÷03 curies of tritium were discharged with a maximum quarterly average concentration of I .44E-04 uCi/mI.

A total of 6.58E-04 curies of dissolved and entrained gases were discharged with a maximum quarterly average concentration of 6.82E-11 uCi/mI.

Gross alpha-emitting radionuclides were below detectable limits.

Quarterly release totals of principal radionuclides in liquid effluents are given in Table 1.2-1.

2.0 SOLID RADIOACTIVE WASTE Solid radioactive wastes were shipped by truck. For detail, refer to Byron Station 201 7 Annual Radiological Effluent Release Report.

3.0 DOSETO MAN 3.1 Gaseous Effluent Pathways Table 3.2-1 summarizes the doses resulting from releases of airborne radioactivity via the different exposure pathways.

3.1.1 Noble Gases 3.1.1.1 Gamma Dose Rates Offsite Gamma air and whole body dose rates are shown in Table 3.2-1 and were calculated based on measured release rates, isotopic composition of the noble gases, and average meteorological data for the period. Dose rates based on concurrent meteorological data are shown in Table 3.4-1 Based on measured effluents and average meteorological data, the maximum gamma air dose was 3.72E-05 mrad based on measured effluents and average meteorological data, and 7.54E-06 mrad based on measured effluents and concurrent meteorological data. (Table 3.4-1).

3.1 .1 .2 Beta Air and Skin Dose Rates The range of beta particles in air is relatively small (on the order of a few meters or less); consequently, plumes of gaseous effluents may be considered semi-infinite for purpose of calculating the dose from beta radiation incident on the skin. However, the actual dose to sensitive skin tissues is difficult to calculate due to the effect of the beta particle energies, thickness of inert skin and clothing covering sensitive tissues. For purposes of this report the skin is taken to have a thickness of 7.0 mg/cm2 and an occupancy factor of I .0 is used. The skin dose based on measured effluents and average meteorological data was I .83E-05 mrem, and I .47E-05 mrem based on measured effluents and concurrent meteorological data.

The maximum offsite beta air dose for the year based on measured effluents and average meteorological data was 1.93E-05 mrad. The beta air dose based on measured effluents and concurrent meteorological data was 1.61E-05 mrad.

3. 1 .2 Radioactive Iodine & Particulate The human thyroid exhibits a significant capacity to concentrate ingested or inhaled iodine. 1-131 released during routine operation of the station may be made available to man resulting in a dose to the thyroid. C-14 is also included in this category.

C-14 exhibits a capacity to concentrate in bone. C-14 is released in gaseous form and is absorbed into vegetation through photosynthesis. The principal pathways of interest for C-I 4 are the consumption of vegetation by humans and milk from which animals have ingested C-14 through the consumption of vegetation. Wth the addition of C-14 to plant effluents, human dose in this category is primarily driven by the release of C-14 from the plant.

The hypothetical dose to the maximum exposed individual living near the station via ingestion of milk and vegetation was calculated. The source of milk and vegetation was assumed to be at the nearest site boundary with the cows pastured and vegetation grown from May through October. The maximum dose from radioactive iodine and particulate (including C-14) to any organ was 6.84E-O1 mrem (child/bone) based on measured effluents and average meteorological data and 7.30E-OJ mrem based on measured effluents and concurrent meteorological data. The maximum dose from radioactive iodine and particulate (including C-14) to the whole body was I .39E-O1 mrem (child) based on measured effluents and average meteorological data and 1.49E-O1 mrem based on measured effluents and concurrent meteorological data.

3. 1 .3 Gaseous Total Dose The maximum total dose from gaseous releases to any organ was 6.84E-OJ mrem (child/bone) based on measured effluents and average meteorological data, and 7.30E-O1 mrem (child/bone) based on measured effluents and concurrent meteorological data. The maximum total dose from gaseous releases to the whole body was I .39E-OJ mrem (child) based on measured effluents and average meteorological data, and I .49 E 01 mrem (child) based on measured effluents and concurrent meteorological data.

3.2 Liquid Effluent Pathways The principal pathways through the aquatic environment for potential doses to man from liquid waste are ingestion of potable water and eating aquatic foods. Liquid dose was calculated based on the ingestion of potable water and sport fish. It should be noted, however, there were no communities within I 0 km downstream of the plant using the Rock River for drinking water. NRC-developed equations were used to calculate the doses to the whole body, bone, liver, thyroid, kidney, lung, lower Cl tract, and skin. Specific parameters for use in the equations are given in the Exelon Offsite Dose Calculation Manual (ODCM). The maximum dose from liquid releases to any organ was I .88E-OJ mrem (adulUgilli). The maximum dose from liquid releases to the whole body was I .38E-OJ mrem (adult).

3.3 Total Dose The maximum total dose to any organ via both gaseous and liquid effluents to any organ is 7.55E-O1 mrem (child/bone). The maximum dose to the whole body via both gaseous and liquid effluents is 2.56E-O1 mrem (child).

3.4 Assessment of Dose to Member of Public Byron Station did not exceed any of the dose limits as shown below based on concurrent or historical meteorological data.

. The RETS limits on dose or dose commitment to a member of the public due to radioactive materials in liquid effluents from each reactor is I .5 mrem to the whole body or 5 mrem to any organ during any calendar quarter and 3 mrem to the whole body or I 0 mrem to any organ during a calendar year.

. The RETS 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 JO mrad for gamma radiation or 20 mrad for beta radiation during a calendar year.

. The RETS 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 IOCFR2O limit on Total Effective Dose Equivalentto individual members of the public is 1 00 mrem during a calendar year.

. The 4OCFRI9O limits on individual members ofthe public is 25 mrem to the whole body, 25 mrem to any organ (except thyroid), and 75 mrem to the thyroid.

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 levels. Data recovery for all measurements on the meteorological tower was 99.9% during 2017.

Intentionally left blank APPENDIX E-1 DATA TABLES AND FIGURES

Intentionally left blank Table 1.1-1 RG I .21 EFFLUENT AND WASTE DISPOSAL REPORT GASEOUS EFFLUENTS SUMMATION OF ALL RELEASES Unit I REPORT FOR 2017 Units QTR 1 QTR 2 QTR 3 QTR 4 YEAR Fission and Activation Gases

1. Total Release Ci 8.64E-02 9.9$E-02 1.49E-O1 2.54E-02 3.61E-O1

2. Avg. Release Rate uCi/sec 1.11E-02 1.27E-02 1.87E-02 3.20E-03 1.14E-02 Iodine-131

1. Total Release Ci 2.$3E-07 (1) (1) (1) 2.$3E-07

2. Avg. Release Rate uCi/sec 3.64E-O8 (1) (1) (1) $.98E-09 Particulates Half Life >= 8 days

1. Total Release Ci (1) (1) (1) (1) (1)

2. Avg. Release Rate uCi/sec (1) (1) (1) (1) (1)

Others

1. Total Release Ci 7.42E-O1 1.1SE+OO 1.12E+OO 1.16E+OO 4.17E+OO

2. Avg. Release Rate uCi/sec 9.55E-02 1.46E-O1 1.40E-O1 1.46E-O1 1.32E-O1 Tritium

1. Total Release Ci 2.82E+Øe 2.20E+OO 2.42E+oe 1.92E+OO 9.37E+OO

2. Avg. Release Rate uCi/sec 3.63E-O1 2.80E-Ø1 3.OSE-O1 2.42E-O1 2.97E-O1 Gross Alpha Radioactivity

1. Total Release Ci (1) (1) (1) (1) (1)

2. Avg. Release Rate uCi/sec (1) (1) (1) (1) (1)

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

Table 1.1-1 (cont.)

RG I .21 EFFLUENT AND WASTE DISPOSAL REPORT GASEOUS EFFLUENTS SUMMATION OF ALL RELEASES Unit 2 REPORT FOR 2017 Units QTR 1 QTR 2 QTR 3 QTR 4 YEAR Fission and Activation Gases

1. Total Release Ci 1.8$E-02 2.84E-02 1.40E-el 2.82E-O1 5.29E-O1

2. Avg. Release Rate uCi/sec 2.42E-03 1.12E-02 1.76E-02 3.55E-02 1.68E-02 Iodine- 131

1. Total Release Ci 1.27E-06 (1) (1) (1) 1.27E-06

2. Avg. Release Rate uCi/sec 1.63E-07 (1) (1) (1) 4.02E-O8 Particulates Half Life >= 8 days

1. Total Release Ci (1) (1) (1) 2.39E-06 2.39E-06

2. Avg. Release Rate uCi/sec (1) (1) (1) 3.O1E-07 7.59E-@8 Ot hers

1. Total Release Ci 1.11E÷ØO 1.11E+OO 1.11E+ee 8.83E-O1 4.22E+OO

2. Avg. Release Rate uCi/sec 1.43E-O1 1.41E-O1 1.40E-O1 1.11E-O1 1.34E-O1 Tritium

1. Total Release Ci 8.37E+OO 7.09E+OO 8.24E+OO 6.52E+OO 3.02E+O1

2. Avg. Release Rate uCi/sec 1.O8E÷O 9.02E-O1 1.04E+OO 8.21E-O1 9.5$E-O1 Gross Alpha Radioactivity

1. Total Release Ci (1) (1) (1) (1) (1)

2. Avg. Release Rate uCi/sec (1) (1) (1) (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 I .2-1 RG I .21 EFFLUENT AND WASTE DISPOSAL REPORT LIQUID EFFLUENTS SUMMATION OF ALL RELEASES Unit I REPORT FOR 2017 Units QTR 1 QTR 2 QTR 3 QTR 4 YEAR Fission and Activation Products

1. Total Release Ci 3.74E-03 1.88E-03 1.52E-03 2.71E-03 9.20E-03

2. Avg. Diluted Conc. uCilml 1.20E-09 5.12E-1O 3.91E-1O 7.$2E-1O 6.51E-1O Tritium

1. Total Release Ci 4.49E+02 9.77E+O1 3.40E÷02 1.O1E+02 9.88E+02

2. Avg. Diluted Conc. uCi/ml 1.44E-04 2.67E-05 8.73E-O5 2.93E-05 6.99E-05 Dissolved and Entrained Gases

1. Total Release Ci 2.12E-04 (1) 1.04E-04 1.21E-O5 3.29E-04

2. Avg. Diluted Conc. uCi/ml 6.82E-11 (1) 2.68E-11 3.50E-12 2.32E-11 Gross Alpha Radioactivity

1. Total Release Ci (1) (1) (1) (1) (1)

Volume of liquid waste liters 3.11E+09 3.66E+09 3.89E÷09 3.47E+09 1.41E+1O (1)Less than minimum detectable activity which meets the lower limit of detection (LLD) requirements of TRM Section 3.11 E-1 -3

Table 1.2-1 (cont)

RG I .21 EFFLUENT AND WASTE DISPOSAL REPORT LIQUID EFFLUENTS SUMMATION OF ALL RELEASES Unit 2 REPORT FOR 2017 Units QTR 1 QTR 2 QTR 3 QTR 4 YEAR Fission and Activation Products

1. Total Release Ci 3.74E-03 1.8$E-e3 1.52E-03 2.71E-03 9.20E-03

2. Avg. Diluted Conc. uCi/ml 1.20E-e9 5.12E-1O 3.91E-1O 7.82E-lO 6.S1E-1O Tritium

1. Total Release Ci 4.49E+02 9.77E+O1 3.40E+02 1.O1E+02 9.88E÷02

2. Avg. Diluted Conc. uCi/ml 1.44E-04 2.67E-e5 8.73E-OS 2.93E-05 6.99E-OS Dissolved and Entrained Gases

1. Total Release Ci 2.12E-04 (1) 1.04E-e4 1.21E-es 3.29E-04

2. Avg. Diluted Conc. uCi/ml 6.$2E-11 (1) 2.68E-11 3.50E-12 2.32E-11 Gross Alpha Radioactivity

1. Total Release Ci (1) (1) (1) (1) (1)

Volume of liquid waste liters 3.11E+09 3.66E÷09 3.$9E+09 3.47E+09 1.41E+1O (1)Less than minimum detectable activity which meets the lower limit of detection (LLD) requirements of TRM Section 3.11 E-1-4

Table 3.1-1 4OCFRI9O URANIUM FUEL CYCLE DOSE REPORT LIQUID DOSE

SUMMARY

Unitsi &2 Report for: 2017 Unit Range - From: 1 To: 2 Liquid Receptor

=== PERIOD DOSE BY ORGAN AND AGE GROUP (mrem) ============ ANNUAL 2017 Agegrp Bone Liver Thyroid Kidney Lung GI-LLI Skin TB ADULT 5.35E-02 1.39E-01 1.35E-01 1.35E-01 1.35E-01 1.SSE-01 0.OOE+00 1.3$E-01 TEEN S.50E-02 1.06E-01 1.O1E-01 1.O1E-01 1.O1E-01 1.39E-01 0.OOE+00 1 .OSE-01 CHILD 7.16E-02 1.17E-01 1.13E-01 1.13E-01 1.13E-01 1.26E-01 0.OOE+00 1.17E-01 INFANT 4.S5E-04 5.OOE-02 5.OOE-02 5.OOE-02 5.OOE-02 5.OOE-02 0.OOE+00 S .OOE-02

=== SITE DOSE LIMIT ANALYSIS ============================= ANNUAL 2017 Age Dose Limit Max % of Annual - Limit Group Organ (mrem) (mrem) Limit 2017 - Admin. Any Organ ADULT GILLI 1.S8E-01 7.SOE+00 2.51E+00 2017 - Admin. Total Body ADULT TBODY 1.38E-01 2.25E+00 6.1SE+00 2017 - T.Spc. Any Organ ADULT GILLI 1.28E-01 1.OOE+0i 1.$SE+00 Critical Pathway: Fresh Water Fish Sport (FFSP)

Major Contributors (0% or greater to total)

Nuclide Percentage H-3 7.1$E+01 CR-Si 1.46E-01 MN-54 2.30E-01 FE-55 5.69E-02 F E -S9 1.31E-01 CO-5$ 3.29E+00 CO-60 4.27E+00 NI-63 3.77E-01 SR-89 2.54E-02 SR-90 5.21E-02 ZR-95 2.86E-04 ZR-97 5.92E-04 NB-95 1.96E+01 MO -99 1.30E-04 AG-iiOM 3.23E-03 SB- 124 5.25E-04 SB- 125 2.72E-03 TE-132 7.18E-02 2017 - T.Spc. Total Body ADULT TBODY 1.3$E-01 3.OOE+00 4.6iE+00 Critical Pathway: Fresh Water Fish Sport (FFSP)

Major Contributors (0% or greater to total)

Nuclide Percentage E-1 -5

Table 3.1-1 (cont) 40CFR190 URANIUM FUEL CYCLE DOSE REPORT LIQUID DOSE

SUMMARY

Unitsi &2 Nuclide Percentage H-3 9.75E+O1 CR-Si 7.89E-04 MN-54 1.94E-02 FE-55 3.14E-02 FE-59 2.04E-02 co-58 4.94E-O1 CO-60 6.82E-O1 NI-63 1.19E+OØ SR-89 6.18E-03 SR-90 5.66E-02 ZR-95 8.30E-G$

ZR-97 1.19E-09 NB-95 2.36E-03 MO-99 1.45E-ØS AG-11OM 6.39E-06 SB-124 9.93E-06 SB-125 8.eoE-05 TE-132 1.94E-03 E-1-6

Table 3.2-1 4OCFRI9O URANIUM FUEL CYCLE DOSE REPORT GASEOUS DOSE

SUMMARY

Unitsi &2 Report for: 2017 Unit Range - From: 1 To: 2

=== I&P DOSE LIMIT ANALYSIS ============================== ANNUAL 2017 Age Dose Limit Max % of Annual - Limit Group Organ (mrem) (mrem) Limit 2017 - Admin. Any Organ CHILD BONE 6.$4E-01 1.13E+01 6.0$E+00 2017 - Admin. Total Body CHILD TBODY 1.39E-01 1.OSE+01 1.32E+00 2017 - T.Spc. Any Organ CHILD BONE 6.84E-01 1.50E+01 4.56E+00 Receptor: Composite Crit. Receptor - IP Distance: $00 (meters) Compass Point: SSE Critical Pathway: Vegetation Major Contributors (0% or greater to total)

Nuclide Percentage H-3 0.OOE+00 C-14 1.OOE+02 CO-5$ 1.59E-05 1-131 4.O1E-05 1-132 2.91E-06 2017 - T.Spc. Total Body CHILD TBODY 1.39E-01 1.50E+01 9.26E-01 Receptor: Composite Crit. Receptor - IP Distance: 800 (meters) Compass Point: SSE Critical Pathway: Vegetation Major Contributors (0% or greater to total)

Nuclide Percentage H-3 1.61E+00 C -14 9.$4E+01 CO-58 1 37E -04 1-131 1.14E-04 1-132 1.41E-05 E-1 -7

Table 3.2-1 (cont.)

4OCFRJ9O URANIUM FUEL CYCLE DOSE REPORT GASEOUS DOSE

SUMMARY

Unitsi &2 Report for: 2017 Unit Range - From: 1 To: 2

=== NG DOSE LIMIT ANALYSIS =============================== ANNUAL 2017 Dose Limit Max % of Annual - Limit (mrad) (mrad) Limit 2017 - Admin. Gamma 3.72E-05 7.50E+00 4.97E-04 2017 - Admin. Beta 1.93E-05 1.50E+01 1.29E-04 2017 T.Spc. Gamma 3.72E-0S 1.OOE+01 3.72E-04 Receptor: Composite Crit. Receptor - NG Distance: 800 (meters) Compass Point: SSE Nuclide Percentage AR-41 S .05E+01 KR-85 7.34E-01 KR-85M 4.29E-03 XE-135 2.06E+01 XE-133M 4.92E-02 XE-133 2.81E÷01 2017 T.Spc. Beta 1.93E-05 2.OOE+01 9.66E-05 Receptor: Composite Crit. Receptor - NG Distance: 800 (meters) Compass Point: SSE Nuclide Percentage AR-41 $.44E+00 KR-85 3.94E+01 KR-$5M 3.25E-03 XE- 135 1.25E+01 XE-133M 1.05E-01 XE-133 3.96E+01 E-1-8

Table 3.3-1 4OCFRI9O URANIUM FUEL CYCLE DOSE REPORT Unitsi &2 Report for: 2017 Unit Range - From: 1 To: 2

=

MAXIMUM DOSE ANALYSIS ===================_===========

ANNUAL 2017 Age Dose Dose Type Group Organ (mrem)

Any Organ CHILD BONE 7.55E-01 Liquid Receptor: Liquid Receptor Gaseous Receptor: Composite Crit. Receptor - IP Distance: 800 (meters) Compass Point: SSE Liquid Dose: 7.16E-02 % of Total: 9.48E+00 Critical Pathway: Fresh Water Fish -

Sport (FFSP)

Major Contributors ( 0% or greater to total)

Nuclide Percentage H-3 0.OOE+00 CR-51 0.OOE+00 MN-54 0.OOE+00 FE-55 5.20E-01 FE-59 5.50E-02 CO-58 0.ØOE+00 CO-60 0.ØOE+00 NI-63 9.35E+01 SR-89 5.94E-01 SR-90 5.33E÷00 ZR-95 1.03E-06 ZR-97 3.77E-08 NB-95 1.81E-02 MO -99 0.OOE+00 AG-1OM 2.$6E-05 SB- 124 8.14E-05 SB- 125 1.1OE-03 TE-132 $.13E-03 Gaseous Dose: 6.$4E-01 % of Total: 9.06E÷01 Critical Pathway: Vegetation (VEG)

Major Contributors (0% or greater to total)

Nuclide Percentage H-3 0.OOE+00 C -14 1.OOE+02 CO-58 1.59E-05 1-131 4.O1E-05 1-132 2.91E-06 E-1-9

Table 3.3-1 (cont.)

4OCFRI9O URANIUM FUEL CYCLE DOSE REPORT Unitsi &2

=== MAXIMUM DOSE ANALYSIS ANNUAL 2017 Age Dose Dose Type Group Organ (mrem)

Total Body CHILD TBODY 2.56E-01 Liquid Receptor : Liquid Receptor Gaseous Receptor: Composite Crit. Receptor - IP Distance: 800 (meters) Compass Point: SSE Liquid Dose: 1.17E-O1 % of Total: 4.57E+O1 Critical Pathway: Fresh Water Fish - Sport (FFSP)

Major Contributors (0% or greater to total)

Nuclide Percentage H-3 9.64E+O1 CR-51 1.03E-03 MN-54 2.47E-02 FE-55 5.23E-02 FE-59 2.71E-02 CO-58 6.38E-O1 CO-60 8.$2E-O1 NI-63 1.94E+OO SR-$9 1.04E-02 SR-90 6.55E-02 ZR-95 1.23E-07 ZR-97 1.96E-09 NB-95 3.OBE-03 MO -99 2.34E-O5 AG-11OM 9.43E-06 SB- 124 1.74E-05 SB- 125 1.41E-04 TE-132 2.66E-03 Gaseous Dose: 1.39E-O1 % of Total: 5.43E+O1 Critical Pathway: Vegetation (VEG)

Major Contributors (0% or greater to total)

Nuclide Percentage H-3 1.61E+OO C -14 9.84E÷el CO-SB 1 3 7 E -04 1-131 1.14E-04 1-132 1.41E-05 E-J-1O

Table 3.4-1 The following are the maximum annual calculated cumulative offsite doses resulting from Byron airborne releases in 2017 based on concurrent meteorological data:

Unit I:

Dose Maximum Value Sector Affected (1) gamma air 4.36 xl 06 mrad North-Northwest beta air (2) 6.02 x106 mrad North-Northwest whole body (3) 7.33 x102 mrem North-Northwest skin (4) 6.35 x106 mrem North-Northwest organ (5) (child-bone) 3.63 x101 mrem North-Northwest Unit I ComDliance Status 10 CFR 50 Appendix I Yearly Objective % ofAppendix I gamma air 10.0 mrad 0.00 betaair 20.0 mrad 0.00 whole body 5.0 mrem I .47 skin 15.0 mrem 0.00 organ 15.0 mrem 2.42 Unit 2:

Sector Dose Maximum Value Affected gamma air (1) 3.18 x106 mrad North-Northwest beta air (2) 1 .01 x105 mrad North-Northwest whole body (3) 7.55 x102 mrem North-Northwest skin4 8.37 x106 mrem North-Northwest organ (5) (child-bone) 3.67 x101 mrem North-Northwest Unit 2 Compliance Status Jo CFR 50 Appendix I Yearly Objective % ofAppendix I gamma air 10.0 mrad 0.00 betaair 20.0 mrad 0.00 wholebody 5.0 mrem 1.51 skin 15.0 mrem 0.00 organ 15.0 mrem 2.45 (1) Gamma Air Dose GASPAR II, NUREG-0597 (2) Beta Air Dose GASPAR II, NUREG-0597 (3) Whole Body Dose GASPAR II, NUREG-0597 (4) Skin Dose GASPAR II, NUREG-0597 (5)

Inhalation and Food Pathways Dose GASPAR II, NUREG-0597 Data recovery: 99.9%

E-1-1J

Intentionally left blank APPENDIX F METEOROLOGICAL DATA

Intentionally left blank Byron Generating Station Period of Record: January March, 2017 Stability Class - Extremely Unstable - 250Ft - 30Ft Delta-T (F)

Winds Measured at 30 Feet Wind Speed (in mph)

Wind Direction 13 47 812 1318 1924 > 24 Total N 1 3 5 1 0 0 10 NNE 1 6 1 5 0 0 13 NE 1 3 2 8 2 0 16 ENE 2 7 12 12 2 0 35 E 2 7 8 0 0 0 17 ESE 0 3 0 0 0 0 3 SE 0 4 0 0 0 0 4 SSE 1 1 6 0 0 0 8 S 0 0 3 1 1 0 5 55W 0 0 6 1 0 0 7 SW 1 5 1 1 0 0 8 WSW 0 1 4 0 0 0 5 W 0 1 17 2 0 0 20 WNW 0 4 4 4 1 0 13 NW 0 3 13 1 0 0 17 NNW 0 2 6 0 0 0 8 Variable 0 0 0 0 0 0 0 Total 9 50 88 36 6 0 189 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-I

Byron Generating Station Period of Record: January - March, 2017 Stability Class - Moderately Unstable - 250Ft-30ft DeltaT (F)

Winds Measured at 30 Feet Wind Speed (in mph)

Wind Direction 13 47 812 1318 1924 > 24 Total N 0 0 0 0 0 0 0 NNE 0 0 0 1 0 0 1 NE 0 0 0 4 0 0 4 ENE 0 1 2 1 0 0 4 E 0 1 1 0 0 0 2 ESE 0 0 0 0 0 0 0 SE 0 0 0 0 0 0 0 SSE 0 0 1 0 0 0 1 S 0 1 1 0 1 0 3 55W 0 0 0 0 0 0 0 SW 0 1 0 1 0 0 2 WSW 0 0 0 0 0 0 0 W 0 0 4 0 1 0 5 WNW 0 0 0 2 0 0 2 NW 0 0 0 0 0 0 0 NNW 0 0 0 1 0 0 1 Variable 0 0 0 0 0 0 0 Total 0 4 9 10 2 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: 3 F-2

Byron Generating Station Period of Record: January - March, 2017 Stability Class - Slightly Unstable - 250Ft-30Ft Delta-T (F)

Winds Measured at 30 Feet Wind Speed (in mph)

Wind Direction 13 47 812 1318 1924 > 24 Total N 0 0 0 0 0 0 0 NNE 0 0 0 0 0 0 0 NE 0 0 0 2 1 0 3 ENE 0 0 0 0 0 0 0 E 0 1 2 0 0 0 3 ESE 0 0 1 0 0 0 1 SE 0 1 0 0 0 0 1 SSE 0 0 2 1 0 0 3 S 0 2 0 2 1 0 5 55W 0 0 0 0 0 0 0 SW 0 1 0 1 0 0 2 WSW 0 0 0 0 0 0 0 W 0 2 2 1 1 0 6 WNW 0 0 2 2 0 0 4 NW 0 3 2 3 0 0 8 NNW 0 1 1 1 0 0 3 Variable 0 0 0 0 0 0 0 Total 0 11 12 13 3 0 39 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 3 F-3

Byron Generating Station Period of Record: January - March, 2017 Stability Class Neutral - 250Ft 3OFt DeltaT (F)

Winds Measured at 30 Feet Wind Speed (in mph)

Wind Direction 13 47 812 1318 1924 > 24 Total N 3 22 49 23 0 0 97 NNE 1 13 20 5 0 0 39 NE 1 13 14 12 2 0 42 ENE 0 18 20 12 2 0 52 E 3 42 16 1 0 0 62 ESE 1 13 25 7 5 0 51 SE 1 8 20 8 2 0 39 SSE 0 3 26 35 1 0 65 S 0 6 31 42 8 0 87 55W 1 13 18 18 1 1 52 SW 1 8 13 8 0 0 30 WSW 2 7 7 7 9 2 34 W 2 14 23 27 3 13 82 WNW 3 11 66 88 11 0 179 NW 4 16 87 88 11 3 209 NNW 2 20 44 20 0 0 86 Variable 0 0 0 0 0 0 0 Total 25 227 479 401 55 19 1206 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-4

Byron Generating Station Period of Record: January - March, 2017 Stability Class Slightly Stable - 250Ft 3OFt Delta-T (F)

Winds Measured at 30 Feet Wind Speed (in mph)

Wind Direction 13 47 812 1318 1924 > 24 Total N 8 14 2 0 0 0 24 NNE 2 8 7 0 0 0 17 NE 2 8 4 1 0 0 15 ENE 2 4 3 1 0 0 10 E 3 20 2 0 0 0 25 ESE 2 12 8 7 4 0 33 SE 2 7 19 12 0 0 40 SSE 2 13 12 18 1 0 46 S 0 10 6 14 4 1 35 55W 1 7 6 11 0 0 25 SW 7 10 17 5 0 0 39 WSW 5 9 15 7 3 2 41 W 6 15 13 12 3 1 50 WNW 8 24 14 10 1 0 57 NW 4 27 10 5 1 0 47 NNW 6 13 9 1 0 0 29 Variable 0 0 0 0 0 0 0 Total 60 201 147 104 17 4 533 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-5

Byron Generating Station Period of Record: January - March, 2017 Stability Class - Moderately Stable 250Ft - 30Ft Delta-T (F)

Winds Measured at 30 Feet Wind Speed (in mph)

Wind Direction 13 47 812 1318 1924 > 24 Total N 2 0 0 0 0 0 2 NNE 0 0 0 0 0 0 0 NE 0 0 0 0 0 0 0 ENE 0 0 2 0 0 0 2 E 2 10 1 0 0 0 13 ESE 0 2 3 0 0 0 5 SE 0 13 8 0 0 0 21 SSE 0 5 4 0 0 0 9 S 2 10 1 1 0 0 14 55W 4 7 2 0 0 0 13 SW 5 9 0 1 0 0 15 WSW 0 2 1 0 0 0 3 W 4 7 0 0 0 0 11 WNW 8 4 0 0 0 0 12 NW 5 6 0 0 0 0 11 NNW 2 2 0 0 0 0 4 Variable 0 0 0 0 0 0 0 Total 34 77 22 2 0 0 135 Hours of calm in this stability class: 1 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 3 F-6

Byron Generating Station Period of Record: January - March, 2017 Stability Class - Extremely Stable - 250Ft - 3OFt Delta-T (F)

Winds Measured at 30 Feet Wind Speed (in mph)

Wind Direction 13 47 812 1318 1924 > 24 Total N 0 0 0 0 0 0 0 NNE 0 0 0 0 0 0 0 NE 0 0 0 0 0 0 0 ENE 0 0 0 0 0 0 0 E 2 1 0 0 0 0 3 ESE 0 3 1 0 0 0 4 SE 1 1 4 0 0 0 6 SSE 3 1 0 0 0 0 4 S 0 2 0 0 0 0 2 55W 0 0 0 0 0 0 0 SW 0 0 0 0 0 0 0 WSW 1 0 0 0 0 0 1 W 2 0 0 0 0 0 2 WNW 1 0 0 0 0 0 1 NW 0 1 0 0 0 0 1 NNW 3 1 0 0 0 0 4 Variable 0 0 0 0 0 0 0 Total 13 10 5 0 0 0 28 Hours of calm in this stability class: 1 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 3 F-7

Byron Generating Station Period of Record: January - March, 2017 Stability Class - Extremely Unstable - 250Ft - 3OFt Delta-T (F)

Winds Measured at 250 Feet Wind Speed (in mph)

Wind Direction 13 47 812 1318 1924 > 24 Total N 0 3 5 1 1 0 10 NNE 0 5 2 3 5 0 15 NE 0 3 0 2 7 1 13 ENE 0 2 2 7 10 4 25 E 0 2 17 7 1 0 27 ESE 0 2 1 0 0 0 3 SE 0 2 4 0 0 0 6 SSE 0 1 1 2 1 0 5 S 0 1 1 3 0 2 7 55W 0 0 0 6 0 1 7 SW 0 0 3 2 0 1 6 WSW 0 1 2 4 0 0 7 W 0 1 3 18 0 0 22 WNW 0 2 2 7 0 1 12 NW 0 1 8 6 0 0 15 NNW 1 1 4 3 0 0 9 Variable 0 0 0 0 0 0 0 Total 1 27 55 71 25 10 189 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-8

Byron Generating Station Period of Record: January - March, 2017 Stability Class - Moderately Unstable - 250Ft - 3OFt Delta-T (F)

Winds Measured at 250 Feet Wind Speed (in mph)

Wind Direction 13 47 812 1318 1924 > 24 Total N 0 0 0 0 0 0 0 NNE 0 0 0 0 0 0 0 NE 0 0 0 1 3 1 5 ENE 0 0 1 1 1 0 3 E 0 0 1 1 0 0 2 ESE 0 0 0 1 0 0 1 SE 0 0 0 0 0 0 0 SSE 0 0 0 1 0 0 1 S 0 0 0 0 0 1 1 55W 0 0 0 2 0 0 2 SW 0 0 0 1 1 0 2 WSW 0 0 0 0 0 0 0 W 0 0 2 1 1 1 5 WNW 0 0 1 0 1 0 2 NW 0 0 0 0 0 0 0 NNW 0 0 0 0 1 0 1 Variable 0 0 0 0 0 0 0 Total 0 0 5 9 8 3 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: 3 F-9

Byron Generating Station Period of Record: January - March, 2017 Stability Class Slightly Unstable 250Ft 3OFt Delta-T (F)

Winds Measured at 250 Feet Wind Speed (in mph)

Wind Direction 13 47 812 1318 1924 > 24 Total N 0 0 1 0 0 0 1 NNE 0 0 0 0 0 0 0 NE 0 0 0 0 2 1 3 ENE 0 0 0 0 0 0 0 E 0 0 1 1 1 0 3 ESE 0 0 1 0 0 0 1 SE 0 0 0 0 0 0 0 SSE 0 0 1 2 1 0 4 S 0 1 0 0 2 1 4 55W 0 0 0 1 0 0 1 SW 0 1 0 0 0 1 2 WSW 0 0 0 0 0 0 0 W 0 0 2 2 2 0 6 WNW 0 0 0 3 1 0 4 NW 0 0 4 4 0 0 8 NNW 0 0 0 2 0 0 2 Variable 0 0 0 0 0 0 0 Total 0 2 10 15 9 3 39 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 3 F-I 0

Byron Generating Station Period of Record: January - March, 2017 Stability Class - Neutral - 250Ft - 3OFt Delta-T (F)

Winds Measured at 250 Feet Wind Speed (in mph)

Wind Direction 13 47 812 1318 1924 > 24 Total N 1 12 31 46 4 0 94 NNE 0 5 18 18 6 0 47 NE 0 10 12 11 2 1 36 ENE 0 6 11 10 16 5 48 E 2 8 39 21 2 0 72 ESE 1 5 7 22 10 4 49 SE 1 2 9 19 12 1 44 SSE 1 3 11 23 26 5 69 S 0 4 23 14 32 12 85 55W 1 5 18 13 9 3 49 SW 3 5 12 10 6 1 37 WSW 0 3 6 6 7 11 33 W 1 6 15 29 17 17 85 WNW 2 3 22 100 50 6 183 NW 2 5 42 112 27 9 197 NNW 2 7 32 34 3 0 78 Variable 0 0 0 0 0 0 0 Total 17 89 308 488 229 75 1206 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-Il

Byron Generating Station Period of Record: January - March, 2017 Stability Class Slightly Stable 250Ft 3OFt DeltaT (F)

Winds Measured at 250 Feet Wind Speed (in mph)

Wind Direction 13 47 812 1318 1924 > 24 Total N 0 4 12 5 0 0 21 NNE 1 1 9 7 1 0 19 NE 0 6 13 2 0 0 21 ENE 0 3 8 2 1 0 14 E 0 3 8 5 0 0 16 ESE 0 2 6 6 8 10 32 SE 0 2 3 10 18 1 34 SSE 1 5 7 13 17 8 51 S 0 3 2 8 18 7 38 55W 0 1 3 12 9 4 29 SW 0 2 1 12 12 5 32 WSW 0 1 10 13 6 8 38 W 0 1 13 19 12 6 51 WNW 0 3 18 19 7 3 50 NW 2 2 31 17 6 0 58 NNW 1 1 14 12 1 0 29 Variable 0 0 0 0 0 0 0 Total 5 40 158 162 116 52 533 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-i 2

Byron Generating Station Period of Record: January - March, 2017 Stability Class - Moderately Stable - 250Ft - 3OFt Delta-T (F)

Winds Measured at 250 Feet Wind Speed (in mph)

Wind Direction 13 47 812 1318 1924 > 24 Total N 0 1 2 1 0 0 4 NNE 0 0 2 0 0 0 2 NE 0 0 1 0 0 0 1 ENE 0 0 0 0 0 0 0 E 0 1 3 4 3 0 11 ESE 0 1 2 1 2 0 6 SE 0 3 1 1 5 0 10 SSE 0 3 3 4 6 0 16 S 0 2 1 3 1 0 7 55W 1 1 3 7 2 1 15 SW 0 2 0 7 1 0 10 WSW 0 0 2 7 0 0 9 W 1 2 7 0 0 0 10 WNW 0 3 7 3 0 0 13 NW 0 3 7 2 0 0 12 NNW 0 1 5 4 0 0 10 Variable 0 0 0 0 0 0 0 Total 2 23 46 44 20 1 136 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-I 3

Byron Generating Station Period of Record: January - March, 2017 Stability Class - Extremely Stable - 250Ft - 3OFt Delta-T (F)

Winds Measured at 250 Feet Wind Speed (in mph)

Wind Direction 13 47 812 1318 1924 > 24 Total N 0 0 0 1 0 0 1 NNE 0 0 1 1 0 0 2 NE 0 0 0 0 0 0 0 ENE 0 1 0 0 0 0 1 E 0 1 0 0 0 0 1 ESE 0 3 0 0 0 0 3 SE 1 0 2 1 1 0 5 SSE 0 0 0 2 2 0 4 S 0 2 1 0 0 0 3 55W 0 0 1 1 0 0 2 SW 0 0 0 1 0 0 1 WSW 0 0 1 0 0 0 1 W 0 0 0 0 0 0 0 WNW 0 0 1 0 0 0 1 NW 0 1 0 0 0 0 1 NNW 0 0 2 1 0 0 3 Variable 0 0 0 0 0 0 0 Total 1 8 9 8 3 0 29 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 3 F-14

Byron Generating Station Period of Record: April - June, 2017 Stability Class - Extremely Unstable - 250Ft - 3OFt Delta-T (F)

Winds Measured at 30 Feet Wind Speed (in mph)

Wind Direction 13 47 812 1318 1924 > 24 Total N 0 0 0 0 0 0 0 NNE 0 0 0 0 0 0 0 NE 0 0 0 0 0 0 0 ENE 0 0 0 0 0 0 0 E 0 0 0 0 0 0 0 ESE 0 0 0 0 0 0 0 SE 0 0 0 0 0 0 0 SSE 0 0 0 0 0 0 0 S 0 0 0 0 0 0 0 55W 0 0 0 0 0 0 0 SW 0 0 0 0 0 0 0 WSW 0 0 0 0 0 0 0 W 0 0 0 0 0 0 0 WNW 0 0 0 0 0 0 0 NW 0 0 0 0 0 0 0 NNW 0 0 0 0 0 0 0 Variable 0 0 0 0 0 0 0 Total 0 0 0 0 0 0 0 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 5 F-I 5

Byron Generating Station Period of Record: April - June, 2017 Stability Class - Moderately Unstable - 250Ft - 3OFt Delta-T (F)

Winds Measured at 30 Feet Wind Speed (in mph)

Wind Direction 13 47 812 13-18 1924 > 24 Total N 0 0 0 0 0 0 0 NNE 0 0 0 0 0 0 0 NE 0 0 0 0 0 0 0 ENE 0 0 0 0 0 0 0 E 0 0 0 0 0 0 0 ESE 0 0 0 0 0 0 0 SE 0 0 0 0 0 0 0 SSE 0 0 0 0 0 0 0 S 0 0 0 0 0 0 0 55W 0 0 1 0 0 0 1 SW 0 0 0 0 0 0 0 WSW 0 0 0 0 0 0 0 W 0 0 0 0 0 0 0 WNW 0 0 1 0 0 0 1 NW 0 0 0 0 0 0 0 NNW 0 0 0 0 0 0 0 Variable 0 0 0 0 0 0 0 Total 0 0 2 0 0 0 2 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 5 F-I 6

Byron Generating Station Period of Record: April - June, 2017 Stability Class Slightly Unstable 250Ft 3OFt DeltaT (F)

Winds Measured at 30 Feet Wind Speed (in mph)

Wind Direction 13 47 8-12 1318 1924 > 24 Total N 0 0 0 0 0 0 0 NNE 0 0 0 4 0 0 4 NE 0 0 2 0 0 0 2 ENE 0 0 2 0 0 0 2 E 0 0 0 0 0 0 0 ESE 0 0 0 0 0 0 0 SE 0 0 0 0 0 0 0 555 0 0 0 3 0 0 3 S 0 0 2 0 1 0 3 55W 0 1 2 5 1 0 9 SW 0 0 3 1 0 0 4 WSW 0 0 0 0 0 0 0 W 0 0 2 0 0 0 2 WNW 0 0 2 7 0 0 9 NW 0 0 0 1 0 0 1 NNW 0 0 0 0 0 0 0 Variable 0 0 0 0 0 0 0 Total 0 1 15 21 2 0 39 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 5 F-17

Byron Generating Station Period of Record: April - June, 2017 Stability Class - Neutral - 250Ft 3OFt Delta-T (F)

Winds Measured at 30 Feet Wind Speed (in mph)

Wind Direction 13 47 812 1318 1924 > 24 Total N 0 15 46 21 1 0 83 NNE 3 8 30 18 0 0 59 NE 0 11 25 36 5 1 78 ENE 2 8 26 21 0 0 57 E 4 18 30 1 0 0 53 ESE 0 14 19 7 0 0 40 SE 0 8 13 6 0 0 27 SSE 2 14 19 12 1 0 48 S 1 1 18 29 12 0 61 55W 0 14 27 26 5 0 72 SW 0 24 29 18 0 0 71 WSW 2 18 32 30 2 0 84 W 2 22 32 51 6 0 113 WNW 5 19 41 59 9 0 133 NW 1 13 16 21 1 0 52 NNW 0 15 28 11 2 0 56 Variable 0 0 0 0 0 0 0 Total 22 222 431 367 44 1 1087 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-I 8

Byron Generating Station Period of Record: April - June, 2017 Stability Class - Slightly Stable 250Ft 3OFt Delta-T (F)

Winds Measured at 30 Feet Wind Speed (in mph)

Wind Direction 13 47 812 1318 1924 > 24 Total N 2 9 11 6 0 0 28 NNE 1 14 8 2 0 0 25 NE 8 13 15 1 0 0 37 ENS 3 15 21 1 0 0 40 E 9 51 25 0 0 0 85 ESE 5 21 15 6 0 0 47 SE 3 8 19 1 0 0 31 SSE 2 10 26 15 0 0 53 S 7 14 17 20 1 0 59 55W 4 20 52 27 1 0 104 SW 3 20 9 5 0 0 37 WSW 5 18 15 2 0 0 40 W 14 29 10 0 0 0 53 WNW 5 19 10 1 0 0 35 NW 5 7 7 3 0 0 22 NNW 5 9 11 2 0 0 27 Variable 0 0 0 0 0 0 0 Total 81 277 271 92 2 0 723 Hours of calm in this stability class: 1 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 5 F1 9

Byron Generating Station Period of Record: April - June, 2017 Stability Class - Moderately Stable - 250Ft - 3OFt Delta-T (F)

Winds Measured at 30 Feet Wind Speed (in mph)

Wind Direction 13 47 812 1318 1924 > 24 Total N 2 5 1 0 0 0 8 NNE 2 3 0 0 0 0 5 NE 1 1 0 0 0 0 2 ENE 2 2 1 0 0 0 5 E 6 4 0 0 0 0 10 ESE 5 20 4 2 0 0 31 SE 3 15 9 1 0 0 28 SSE 2 22 7 0 0 0 31 S 6 13 5 0 0 0 24 55W 5 6 0 0 0 0 11 SW 10 8 0 0 0 0 18 WSW 10 2 1 0 0 0 13 W 16 4 2 0 0 0 22 WNW 10 3 0 0 0 0 13 NW 4 3 0 0 0 0 7 NNW 3 6 0 0 0 0 9 Variable 0 0 0 0 0 0 0 Total 87 117 30 3 0 0 237 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: 5 F-20

Byron Generating Station Period of Record: April - June, 2017 Stability Class - Extremely Stable - 250Ft - 3OFt Delta-T (F)

Winds Measured at 30 Feet Wind Speed (in mph)

Wind Direction 13 47 812 1318 1924 > 24 Total N 0 0 0 0 0 0 0 NNE 0 0 0 0 0 0 0 NE 0 0 0 0 0 0 0 ENE 0 0 0 0 0 0 0 E 0 2 0 0 0 0 2 ESE 0 6 1 0 0 0 7 SE 2 2 0 0 0 0 4 SSE 4 1 2 0 0 0 7 S 5 6 1 0 0 0 12 55W 7 2 0 0 0 0 9 SW 9 0 0 0 0 0 9 WSW 5 0 0 0 0 0 5 W 8 0 0 0 0 0 8 WNW 3 0 0 0 0 0 3 NW 8 0 0 0 0 0 8 NNW 2 1 0 0 0 0 3 Variable 0 0 0 0 0 0 0 Total 53 20 4 0 0 0 77 Hours of calm in this stability class: 7 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 5 F-21

Byron Generating Station Period of Record: April - June, 2017 Stability Class - Extremely Unstable - 250Ft - 3OFt Delta-T (F)

Winds Measured at 250 Feet Wind Speed (in mph)

Wind Direction 13 47 812 1318 1924 > 24 Total N 0 0 0 0 0 0 0 NNE 0 0 0 0 0 0 0 NE 0 0 0 0 0 0 0 ENE 0 0 0 0 0 0 0 E 0 0 0 0 0 0 0 ESE 0 0 0 0 0 0 0 SE 0 0 0 0 0 0 0 SSE 0 0 0 0 0 0 0 S 0 0 0 0 0 0 0 55W 0 0 0 0 0 0 0 SW 0 0 0 0 0 0 0 WSW 0 0 0 0 0 0 0 W 0 0 0 0 0 0 0 WNW 0 0 0 0 0 0 0 NW 0 0 0 0 0 0 0 NNW 0 0 0 0 0 0 0 Variable 0 0 0 0 0 0 0 Total 0 0 0 0 0 0 0 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 5 F-22

Byron Generating Station Period of Record: April - June, 2017 Stability Class - Moderately Unstable - 250Ft - 3OFt DeltaT (F)

Winds Measured at 250 Feet Wind Speed (in mph)

Wind Direction 13 47 812 1318 1924 > 24 Total N 0 0 0 0 0 0 0 NNE 0 0 0 0 0 0 0 NE 0 0 0 0 0 0 0 ENE 0 0 0 0 0 0 0 E 0 0 0 0 0 0 0 ESE 0 0 0 0 0 0 0 SE 0 0 0 0 0 0 0 SSE 0 0 0 0 0 0 0 S 0 0 0 0 0 0 0 55W 0 0 0 1 0 0 1 SW 0 0 0 0 0 0 0 WSW 0 0 0 0 0 0 0 W 0 0 0 0 0 0 0 WNW 0 0 0 1 0 0 1 NW 0 0 0 0 0 0 0 NNW 0 0 0 0 0 0 0 Variable 0 0 0 0 0 0 0 Total 0 0 0 2 0 0 2 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 5 F-23

Byron Generating Station Period of Record: April - June, 2017 Stability Class - Slightly Unstable - 250Ft - 30Ft DeltaT (F)

Winds Measured at 250 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 812 1318 1924 > 24 Total N 0 0 0 0 0 0 0 NNE 0 0 0 1 0 0 1 NE 0 0 1 2 2 0 5 ENE 0 0 2 0 0 0 2 E 0 0 0 0 0 0 0 ESE 0 0 0 0 0 0 0 SE 0 0 0 0 0 0 0 SSE 0 0 0 3 1 1 5 S 0 0 1 0 0 0 1 55W 0 0 0 5 2 1 8 SW 0 1 0 3 1 0 5 WSW 0 0 0 0 0 0 0 w 0 0 0 2 0 0 2 WNW 0 0 0 5 5 0 10 NW 0 0 0 0 0 0 0 NNW 0 0 0 0 0 0 0 Variable 0 0 0 0 0 0 0 Total 0 1 4 21 11 2 39 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 5 F-24

Byron Generating Station Period of Record: April - June, 2017 Stability Class Neutral - 250Ft - 3OFt Delta-T (F)

Winds Measured at 250 Feet Wind Speed (in mph)

Wind Direction 13 47 812 1318 1924 > 24 Total N 0 8 23 44 8 0 83 NNE 0 3 14 21 10 6 54 NE 1 4 21 27 24 10 87 ENE 1 4 12 20 15 2 54 E 2 11 20 22 7 0 62 ESE 0 10 8 13 6 1 38 SE 1 3 19 9 2 0 34 SSE 1 5 16 14 4 3 43 S 0 3 3 18 22 16 62 55W 0 8 8 23 19 7 65 SW 0 12 21 25 14 5 77 WSW 0 13 20 22 26 2 83 W 1 12 21 28 44 7 113 WNW 4 8 27 52 34 8 133 NW 2 6 8 18 11 0 45 NNW 1 8 20 14 11 0 54 Variable 0 0 0 0 0 0 0 Total 14 118 261 370 257 67 1087 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-25

Byron Generating Station Period of Record: April - June, 2017 Stability Class Slightly Stable - 250Ft 3OFt Delta-T (F)

Winds Measured at 250 Feet Wind Speed (in mph)

Wind Direction 13 47 812 1318 1924 > 24 Total N 0 2 4 10 7 0 23 NNE 0 3 4 12 1 0 20 NE 0 6 15 15 3 0 39 ENE 3 5 15 17 2 0 42 E 4 10 34 40 6 1 95 ESE 1 5 9 15 10 1 41 SE 3 4 10 9 6 0 32 SSE 1 0 4 11 23 3 42 S 1 3 5 17 23 11 60 55W 0 3 7 34 52 3 99 SW 1 4 13 12 10 4 44 WSW 0 2 13 16 4 0 35 W 0 5 18 28 0 0 51 WNW 2 5 18 24 1 0 50 NW 0 8 10 7 2 0 27 NNW 0 4 4 14 2 0 24 Variable 0 0 0 0 0 0 0 Total 16 69 183 281 152 23 724 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 Generating Station Period of Record: April - June, 2017 Stability Class - Moderately Stable - 250Ft - 3OFt Delta-T (F)

Winds Measured at 250 Feet Wind Speed (in mph)

Wind Direction 13 47 812 1318 1924 > 24 Total N 0 1 2 1 0 0 4 NNE 1 1 0 1 0 0 3 NE 0 3 2 3 0 0 8 ENS 0 3 4 0 0 0 7 E 1 5 3 3 0 0 12 ESE 0 1 7 6 2 2 18 SE 2 2 8 10 5 1 28 SSE 0 0 5 11 5 1 22 S 0 2 5 13 7 0 27 55W 0 4 5 16 2 0 27 SW 0 1 5 5 1 0 12 WSW 1 0 1 6 0 0 8 W 0 3 8 14 3 0 28 WNW 0 6 14 2 0 0 22 NW 0 0 6 0 0 0 6 NNW 0 0 3 7 0 0 10 Variable 0 0 0 0 0 0 0 Total 5 32 78 98 25 4 242 Hours of calm in this stability class: 1 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 5 F-27

Byron Generating Statior Period of Record: April - June, 2017 Stability Class - Extremely Stable - 250Ft-3OFt Delta-T (F)

Winds Measured at 250 Feet Wind Speed (in mph)

Wind Direction 13 47 812 1318 1924 > 24 Total N 1 0 3 0 0 0 4 NNE 0 1 1 0 0 0 2 NE 0 1 0 0 0 0 1 ENE 1 0 0 0 0 0 1 E 2 0 0 0 0 0 2 ESE 0 0 1 0 0 0 1 SE 0 0 1 6 1 0 8 SSE 0 1 2 2 1 0 6 S 0 0 0 5 0 0 5 55W 0 2 2 7 1 0 12 SW 0 1 1 6 0 0 8 WSW 0 2 4 2 0 0 8 W 0 1 5 1 0 0 7 WNW 1 1 0 1 0 0 3 NW 2 4 0 0 0 0 6 NNW 0 2 8 0 0 0 10 Variable 0 0 0 0 0 0 0 Total 7 16 28 30 3 0 84 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-28

Byron Generating Station Period of Record: July - September, 2017 Stability Class - Extremely Unstable - 250Ft - 3OFt Delta-T (F)

Winds Measured at 30 Feet Wind Speed (in mph)

Wind Direction 13 47 812 1318 1924 > 24 Total N 0 0 1 0 0 0 1 NNE 0 0 0 0 0 0 0 NE 0 0 0 0 0 0 0 ENE 0 0 0 0 0 0 0 E 0 3 0 0 0 0 3 ESE 0 2 4 0 0 0 6 SE 0 0 1 0 0 0 1 SSE 0 0 2 0 0 0 2 S 0 0 7 2 0 0 9 55W 0 1 3 0 0 0 4 SW 0 0 2 0 0 0 2 WSW 0 0 0 0 0 0 0 W 0 0 0 0 0 0 0 WNW 0 1 0 0 0 0 1 NW 0 0 1 0 0 0 1 NNW 0 0 1 0 0 0 1 Variable 0 0 0 0 0 0 0 Total 0 7 22 2 0 0 31 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-29

Byron Generating Station Period of Record: July - September, 2017 Stability Class - Moderately Unstable 250Ft - 3OFt Delta-T (F)

Winds Measured at 30 Feet Wind Speed (in mph)

Wind Direction 13 47 812 1318 1924 > 24 Total N 0 0 3 0 0 0 3 NNE 0 0 0 0 0 0 0 NE 0 0 0 0 0 0 0 ENE 0 3 0 0 0 0 3 E 0 3 4 0 0 0 7 ESE 0 1 3 0 0 0 4 55 0 2 1 0 0 0 3 SSE 0 0 0 0 0 0 0 S 0 1 5 1 0 0 7 55W 0 2 6 0 0 0 8 SW 0 1 0 0 0 0 1 WSW 0 0 0 0 0 0 0 W 0 2 0 0 0 0 2 WNW 0 1 2 1 0 0 4 NW 0 0 5 0 0 0 5 NNW 0 0 2 0 0 0 2 Variable 0 0 0 0 0 0 0 Total 0 16 31 2 0 0 49 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 3 F3O

Byron Generating Station Period of Record: July - September, 2017 Stability Class - Slightly Unstable - 250Ft - 3OFt Delta-T (F)

Winds Measured at 30 Feet Wind Speed (in mph)

Wind Direction 13 47 8-12 1318 1924 > 24 Total N 0 0 2 0 0 0 2 NNE 0 1 1 0 0 0 2 NE 0 1 0 0 0 0 1 ENE 0 3 0 0 0 0 3 E 0 3 2 0 0 0 5 ESE 0 5 2 0 0 0 7 SE 0 3 2 0 0 0 5 SSE 0 0 1 0 0 0 1 S 0 2 3 0 0 0 5 55W 0 3 0 0 0 0 3 SW 0 3 1 0 0 0 4 WSW 0 2 0 0 0 0 2 W 0 1 1 0 0 0 2 WNW 0 1 2 0 0 0 3 NW 0 0 4 1 0 0 5 NNW 0 0 3 0 0 0 3 Variable 0 0 0 0 0 0 0 Total 0 28 24 1 0 0 53 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 3 F-31

Byron Generating Station Period of Record: July - September, 2017 Stability Class - Neutral - 250Ft - 3OFt Delta-T (F)

Winds Measured at 30 Feet Wind Speed (in mph)

Wind Direction 13 47 812 1318 1924 > 24 Total N 0 17 22 1 0 0 40 NNE 2 23 28 0 0 0 53 NE 3 14 11 0 0 0 28 ENE 2 27 5 0 0 0 34 E 11 43 1 0 0 0 55 ESE 3 13 6 0 0 0 22 SE 8 17 11 0 0 0 36 SSE 5 33 22 0 0 0 60 S 6 29 31 2 0 0 68 55W 6 24 20 1 0 0 51 SW 6 21 20 0 0 0 47 WSW 3 36 9 9 0 0 57 W 8 33 22 7 0 0 70 WNW 9 27 33 2 0 0 71 NW 7 25 30 15 0 0 77 NNW 5 20 33 2 0 0 60 Variable 0 0 0 0 0 0 0 Total 84 402 304 39 0 0 829 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-32

Byron Generating Station Period of Record: July - September, 2017 Stability Class - Slightly Stable - 250Ft - 3OFt Delta-T (F)

Winds Measured at 30 Feet Wind Speed (in mph)

Wind Direction 13 47 8-12 1318 1924 > 24 Total N 2 10 3 2 0 0 17 NNE 7 8 4 1 0 0 20 NE 6 14 8 0 0 0 28 ENE 3 21 7 0 0 0 31 E 4 56 3 0 0 0 63 ESE 4 17 7 0 0 0 28 SE 8 17 12 0 0 0 37 SSE 7 36 9 0 0 0 52 S 6 22 6 1 0 0 35 55W 8 13 11 3 0 0 35 SW 7 19 5 0 0 0 31 WSW 16 19 8 0 0 0 43 W 19 26 4 0 0 0 49 WNW 16 16 7 1 0 0 40 NW 5 25 6 1 0 0 37 NNW 7 30 5 0 0 0 42 Variable 0 0 0 0 0 0 0 Total 125 349 105 9 0 0 588 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 Generating Station Period of Record: July - September, 2017 Stability Class - Moderately Stable - 250Ft - 3OFt DeltaT (F)

Winds Measured at 30 Feet Wind Speed (in mph)

Wind Direction 13 47 812 1318 1924 > 24 Total N 4 7 1 0 0 0 12 NNE 7 8 1 0 0 0 16 NE 8 4 0 0 0 0 12 ENE 3 12 1 0 0 0 16 E 11 31 0 0 0 0 42 ESE 7 25 1 0 0 0 33 SE 4 27 3 0 0 0 34 SSE 7 43 17 0 0 0 67 S 3 17 3 0 0 0 23 55W 11 10 0 0 0 0 21 SW 12 1 0 0 0 0 13 WSW 16 2 0 0 0 0 18 W 19 14 0 0 0 0 33 WNW 14 6 0 0 0 0 20 NW 13 2 0 0 0 0 15 NNW 8 8 0 0 0 0 16 Variable 0 0 0 0 0 0 0 Total 147 217 27 0 0 0 391 Hours of calm in this stability class: 8 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 3 F-34

Byron Generating Station Period of Record: July - September, 2017 Stability Class - Extremely Stable - 250Ft - 3OFt Delta-T (F)

Winds Measured at 30 Feet Wind Speed (in mph)

Wind Direction 13 47 812 1318 1924 > 24 Total N 3 0 0 0 0 0 3 NNE 2 0 0 0 0 0 2 NE 2 0 0 0 0 0 2 ENE 1 1 0 0 0 0 2 S 7 8 0 0 0 0 15 ESE 8 25 0 0 0 0 33 SE 2 31 0 0 0 0 33 SSE 2 26 0 0 0 0 28 S 14 7 1 0 0 0 22 55W 8 2 0 0 0 0 10 SW 7 0 0 0 0 0 7 WSW 12 1 0 0 0 0 13 W 13 2 0 0 0 0 15 WNW 17 0 0 0 0 0 17 NW 20 3 0 0 0 0 23 NNW 4 1 0 0 0 0 5 Variable 0 0 0 0 0 0 0 Total 122 107 1 0 0 0 230 Hours of calm in this stability class: 26 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 3 F-35

Byron Generating Station Period of Record: July - September, 2017 Stability Class Extremely Unstable - 250Ft - 3OFt Delta-T (F)

Winds Measured at 250 Feet Wind Speed (in mph)

Wind Direction 13 47 812 1318 1924 > 24 Total N 0 0 0 1 0 0 1 NNE 0 0 0 0 0 0 0 NE 0 0 0 0 0 0 0 ENE 0 0 0 0 0 0 0 E 0 2 1 0 0 0 3 ESE 0 0 4 2 0 0 6 SE 0 0 1 0 0 0 1 SSE 0 0 0 1 0 0 1 S 0 0 1 7 2 0 10 55W 0 0 1 3 0 0 4 SW 0 0 0 2 0 0 2 WSW 0 0 0 0 0 0 0 W 0 0 0 0 0 0 0 WNW 0 0 1 0 0 0 1 NW 0 0 1 0 0 0 1 NNW 0 0 1 0 0 0 1 Variable 0 0 0 0 0 0 0 Total 0 2 11 16 2 0 31 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-36

Byron Generating Station Period of Record: July - September, 2017 Stability Class - Moderately Unstable - 250Ft - 3OFt Delta-T (F)

Winds Measured at 250 Feet Wind Speed (in mph)

Wind Direction 13 47 812 1318 1924 > 24 Total N 0 0 3 0 0 0 3 NNE 0 0 0 0 0 0 0 NE 0 0 0 0 0 0 0 ENE 0 1 1 0 0 0 2 E 0 3 3 2 0 0 8 ESE 0 1 2 1 0 0 4 SE 0 0 3 0 0 0 3 SSE 0 0 0 1 0 0 1 S 0 0 3 2 1 0 6 55W 0 0 7 1 0 0 8 SW 0 1 0 0 0 0 1 WSW 0 0 0 0 0 0 0 W 0 0 2 0 0 0 2 WNW 0 1 1 2 1 0 5 NW 0 0 1 3 0 0 4 NNW 0 0 1 1 0 0 2 Variable 0 0 0 0 0 0 0 Total 0 7 27 13 2 0 49 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 3 F-37

Byron Generating Station Period of Record: July - September, 2017 Stability Class - Slightly Unstable - 250Ft - 3OFt Delta-T (F)

Winds Measured at 250 Feet Wind Speed (in mph)

Wind Direction 13 47 812 1318 1924 > 24 Total N 0 0 2 0 0 0 2 NNE 0 0 1 0 0 0 1 NE 0 2 0 0 0 0 2 ENE 0 1 1 0 0 0 2 E 0 4 3 0 0 0 7 ESE 0 1 5 1 0 0 7 SE 0 0 4 0 0 0 4 SSE 0 0 1 0 0 0 1 S 0 2 2 1 0 0 5 55W 0 0 3 0 0 0 3 SW 0 3 2 0 0 0 5 WSW 0 0 1 0 0 0 1 W 0 0 1 2 0 0 3 WNW 0 0 1 2 0 0 3 NW 0 0 1 2 1 0 4 NNW 0 0 1 2 0 0 3 Variable 0 0 0 0 0 0 0 Total 0 13 29 10 1 0 53 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 3 F-38

Byron Generating Station Period of Record: July - September, 2017 Stability Class - Neutral - 250Ft - 3OFt Delta-T (F)

Winds Measured at 250 Feet Wind Speed (in mph)

Wind Direction 13 47 812 1318 1924 > 24 Total N 2 11 13 5 0 0 31 NNE 2 10 31 17 0 0 60 NE 1 8 10 10 0 0 29 ENE 6 12 16 6 0 0 40 E 2 25 24 3 0 0 54 ESE 3 11 11 3 0 0 28 SE 3 12 15 6 2 0 38 SSE 2 16 23 15 1 0 57 S 0 13 32 15 2 1 63 55W 3 9 22 16 1 1 52 SW 2 19 24 10 3 0 58 WSW 0 14 23 7 9 0 53 W 2 16 23 13 4 2 60 WNW 2 27 19 27 1 0 76 NW 2 13 28 26 12 0 81 NNW 3 7 27 12 0 0 49 Variable 0 0 0 0 0 0 0 Total 35 223 341 191 35 4 829 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 F39

Byron Generating Station Period of Record: July - September, 2017 Stability Class Slightly Stable 250Ft 3OFt Delta-T (F)

Winds Measured at 250 Feet Wind Speed (in mph)

Wind Direction 13 47 8-12 1318 1924 > 24 Total N 0 5 5 5 1 0 16 NNE 0 3 6 8 3 0 20 NE 1 8 7 7 0 0 23 ENE 2 11 10 19 1 0 43 E 1 12 35 19 0 0 67 ESE 1 1 9 6 4 0 21 SE 0 8 6 9 7 0 30 SSE 2 11 10 19 5 0 47 S 0 7 13 11 7 0 38 55W 0 2 10 16 8 2 38 SW 1 2 19 18 2 0 42 WSW 0 7 17 15 0 0 39 W 1 3 32 6 1 0 43 WNW 0 5 18 14 2 0 39 NW 0 3 21 14 0 0 38 NNW 2 3 17 21 1 0 44 Variable 0 0 0 0 0 0 0 Total 11 91 235 207 42 2 588 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 Generating Station Period of Record: July - September, 2017 Stability Class - Moderately Stable - 250Ft - 3OFt Delta-T (F)

Winds Measured at 250 Feet Wind Speed (in mph)

Wind Direction 13 47 812 1318 1924 > 24 Total N 0 3 6 6 0 0 15 NNE 3 2 5 6 1 0 17 NE 0 3 9 5 1 0 18 ENE 3 9 10 4 4 0 30 E 1 4 9 12 5 0 31 ESE 0 3 4 8 10 0 25 SE 0 3 12 10 4 0 29 SSE 0 4 6 14 14 0 38 S 1 2 4 25 15 0 47 55W 0 5 5 16 5 0 31 SW 0 1 5 10 0 0 16 WSW 0 1 8 4 0 0 13 W 0 0 17 8 0 0 25 WNW 1 3 16 9 0 0 29 NW 1 5 14 3 0 0 23 NNW 0 4 6 2 0 0 12 Variable 0 0 0 0 0 0 0 Total 10 52 136 142 59 0 399 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 Generating Station Period of Record: July - September, 2017 Stability Class - Extremely Stable - 250Ft - 3OFt Delta-T (F)

Winds Measured at 250 Feet Wind Speed (in mph)

Wind Direction 13 47 812 1318 1924 > 24 Total N 1 4 5 1 0 0 11 NNE 5 2 2 1 0 0 10 NE 2 1 3 2 0 0 8 ENE 2 4 5 1 0 0 12 E 2 6 11 1 0 0 20 ESE 3 3 2 1 5 1 15 SE 1 4 3 16 8 0 32 SSE 0 4 5 21 11 0 41 S 1 4 6 12 5 0 28 55W 0 4 5 5 0 0 14 SW 1 2 6 2 0 0 11 WSW 1 3 7 1 0 0 12 W 1 1 8 0 0 0 10 WNW 0 2 3 8 0 0 13 NW 0 3 4 0 0 0 7 NNW 0 2 9 1 0 0 12 Variable 0 0 0 0 0 0 0 Total 20 49 84 73 29 1 256 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 Generating Station Period of Record: October - December, 2017 Stability Class - Extremely Unstable - 250Ft 3OFt Delta-T (F)

Winds Measured at 30 Feet Wind Speed (in mph)

Wind Direction 13 4-7 812 1318 1924 > 24 Total N 1 1 0 0 0 0 2 NNE 1 0 0 0 0 0 1 NE 0 0 0 0 0 0 0 ENE 0 0 0 0 0 0 0 E 0 1 0 0 0 0 1 ESE 0 2 0 0 0 0 2 SE 1 2 0 0 0 0 3 SSE 1 1 1 1 0 0 4 S 1 0 1 0 0 0 2 55W 1 0 0 0 0 0 1 SW 1 0 1 0 0 0 2 WSW 0 1 0 0 0 0 1 W 2 0 2 0 0 0 4 WNW 2 2 1 0 0 0 5 NW 1 3 2 1 0 0 7 NNW 1 0 0 0 0 0 1 Variable 0 0 0 0 0 0 0 Total 13 13 8 2 0 0 36 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-43

Byron Generating Station Period of Record: October - Decenther, 2017 Stability Class - Moderately Unstable - 250Ft 3OFt Delta-T (F)

Winds Measured at 30 Feet Wind Speed (in mph)

Wind Direction 13 47 8-12 1318 1924 > 24 Total N 0 1 1 0 0 0 2 NNE 0 1 0 0 0 0 1 NE 0 0 0 0 0 0 0 ENE 0 1 0 0 0 0 1 E 0 2 0 0 0 0 2 ESE 0 2 0 0 0 0 2 SE 0 0 0 0 0 0 0 SSE 1 0 0 0 0 0 1 S 0 0 3 4 0 0 7 55W 0 1 1 2 0 0 4 SW 0 1 3 0 0 0 4 WSW 1 0 1 0 0 0 2 W 1 2 3 0 0 0 6 WNW 0 0 2 0 0 0 2 NW 0 1 0 0 0 0 1 NNW 1 2 1 0 0 0 4 Variable 0 0 0 0 0 0 0 Total 4 14 15 6 0 0 39 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 0 F-44

Byron Generating Station Period of Record: October - DecemiDer, 2017 Stability Class - Slightly Unstable 250Ft - 3OFt DeltaT (F)

Winds Measured at 30 Feet Wind Speed (in mph)

Wind Direction 13 47 812 1318 1924 > 24 Total N 1 0 0 0 0 0 1 NNE 0 1 0 0 0 0 1 NE 0 0 1 0 0 0 1 ENE 0 1 0 1 0 0 2 E 0 3 1 0 0 0 4 ESE 0 1 0 0 0 0 1 SE 1 0 1 0 0 0 2 SSE 0 1 2 2 0 0 5 S 0 0 2 1 0 0 3 55W 0 4 5 2 0 0 11 SW 2 2 3 1 0 0 8 WSW 0 0 2 0 0 0 2 W 0 1 1 0 0 0 2 WNW 0 2 0 2 0 0 4 NW 0 2 0 0 0 0 2 NNW 0 1 2 1 0 0 4 Variable 0 0 0 0 0 0 0 Total 4 19 20 10 0 0 53 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 0 F-45

Byron Generating Station Period of Record: October - DecemiDer, 2017 Stability Class - Neutral - 250Ft - 3OFt DeltaT (F)

Winds Measured at 30 Feet Wind Speed (in mph)

Wind Direction 13 47 812 1318 1924 > 24 Total N 1 10 41 7 0 0 59 NNE 1 12 33 1 0 0 47 NE 5 6 8 6 0 0 25 ENE 6 22 13 2 0 0 43 E 4 24 1 0 0 0 29 ESE 1 12 13 0 0 0 26 SE 2 11 23 8 0 0 44 SSE 3 20 59 16 1 0 99 S 0 7 25 22 5 0 59 55W 2 12 15 16 3 0 48 SW 3 20 28 4 0 0 55 WSW 1 22 37 21 3 0 84 W 8 17 35 35 7 6 108 WNW 5 21 54 69 8 0 157 NW 7 31 56 60 13 0 167 NNW 2 12 28 24 4 0 70 Variable 0 0 0 0 0 0 0 Total 51 259 469 291 44 6 1120 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-46

Byron Generating Station Period of Record: October - December, 2017 Stability Class Slightly Stable 250Ft 3OFt Delta-T (F)

Winds Measured at 30 Feet Wind Speed (in mph)

Wind Direction 13 47 812 1318 1924 > 24 Total N 3 13 10 0 0 0 26 NNE 1 3 9 0 0 0 13 NE 1 3 5 1 0 0 10 ENE 1 1 8 1 0 0 11 E 6 18 2 0 0 0 26 ESE 4 5 8 0 0 0 17 SE 4 14 12 1 0 0 31 SSE 1 20 49 30 0 0 100 S 10 25 41 16 3 0 95 55W 4 20 35 20 5 0 84 SW 8 31 25 5 0 0 69 WSW 5 13 18 5 1 3 45 W 9 23 23 4 1 2 62 WNW 9 19 26 7 0 0 61 NW 5 24 25 5 0 0 59 NNW 4 24 11 0 0 0 39 Variable 0 0 0 0 0 0 0 Total 75 256 307 95 10 5 748 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 Generating Station Period of Record: October - December, 2017 Stability Class - Moderately Stable - 250Ft - 3OFt Delta-T (F)

Winds Measured at 30 Feet Wind Speed (in mph)

Wind Direction 13 47 812 1318 1924 > 24 Total N 0 1 0 0 0 0 1 NNE 1 0 0 0 0 0 1 NE 0 0 0 0 0 0 0 ENE 1 0 0 0 0 0 1 E 2 1 0 0 0 0 3 ESE 1 6 5 0 0 0 12 SE 0 17 5 0 0 0 22 SSE 0 9 9 0 0 0 18 S 3 20 6 0 0 0 29 55W 3 8 2 0 0 0 13 SW 6 0 0 0 0 0 6 WSW 4 0 0 0 0 0 4 W 6 2 0 0 0 0 8 WNW 4 2 0 0 0 0 6 NW 5 0 0 0 0 0 5 NNW 1 4 1 0 0 0 6 Variable 0 0 0 0 0 0 0 Total 37 70 28 0 0 0 135 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 Generating Station Period of Record: October - December, 2017 Stability Class - Extremely Stable 250Ft - 3OFt Delta-T (F)

Winds Measured at 30 Feet Wind Speed (in mph)

Wind Direction 13 47 812 1318 1924 > 24 Total N 1 0 0 0 0 0 1 NNE 0 1 0 0 0 0 1 NE 0 0 0 0 0 0 0 ENE 1 0 0 0 0 0 1 E 0 0 0 0 0 0 0 ESE 0 0 0 0 0 0 0 SE 3 8 0 0 0 0 11 SSE 2 8 0 0 0 0 10 S 6 13 1 0 0 0 20 55W 3 1 0 0 0 0 4 SW 6 0 0 0 0 0 6 WSW 1 0 0 0 0 0 1 W 3 0 0 0 0 0 3 WNW 6 0 0 0 0 0 6 NW 7 0 0 0 0 0 7 NNW 4 1 0 0 0 0 5 Variable 0 0 0 0 0 0 0 Total 43 32 1 0 0 0 76 Hours of calm in this stability class: 1 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 0 F-49

Byron Generating Station Period of Record: October - December, 2017 Stability Class - Extremely Unstable - 250Ft 3OFt DeltaT (F)

Winds Measured at 250 Feet Wind Speed (in mph)

Wind Direction 13 47 812 1318 1924 > 24 Total N 0 1 0 0 0 0 1 NNE 0 0 0 0 0 0 0 NE 1 0 0 0 0 0 1 ENE 0 0 0 0 0 0 0 E 0 0 1 0 0 0 1 ESE 0 0 2 0 0 0 2 SE 0 2 1 0 0 0 3 SSE 0 2 0 2 0 0 4 S 0 0 0 1 0 0 1 55W 1 1 0 0 0 0 2 SW 2 0 1 0 0 0 3 WSW 0 1 0 0 0 0 1 W 0 1 3 0 0 0 4 WNW 3 1 0 0 0 0 4 NW 0 3 2 0 1 0 6 NNW 0 2 1 0 0 0 3 Variable 0 0 0 0 0 0 0 Total 7 14 11 3 1 0 36 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-50

Byron Generating Station Period of Record: October - December, 2017 Stability Class - Moderately Unstable - 250Ft - 3OFt Delta-T (F)

Winds Measured at 250 Feet Wind Speed (in mph)

Wind Direction 13 47 812 1318 19-24 > 24 Total N 0 1 0 0 0 0 1 NNE 0 0 1 1 0 0 2 NE 0 0 0 0 0 0 0 ENE 0 0 1 0 0 0 1 E 0 1 0 1 0 0 2 ESE 0 0 1 1 0 0 2 SE 0 0 0 0 0 0 0 SSE 0 1 0 0 1 0 2 S 0 0 0 3 3 0 6 55W 0 0 1 1 2 0 4 SW 1 0 1 0 3 0 5 WSW 0 1 1 0 0 0 2 W 0 1 5 0 0 0 6 WNW 0 0 2 0 0 0 2 NW 0 0 0 0 0 0 0 NNW 0 2 2 0 0 0 4 Variable 0 0 0 0 0 0 0 Total 1 7 15 7 9 0 39 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 0 F-51

Byron Generating Station Period of Record: October - December, 2017 Stability Class - Slightly Unstable - 250Ft - 3OFt DeltaT (F)

Winds Measured at 250 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 812 1318 1924 > 24 Total N 1 0 0 0 0 0 1 NNE 0 0 1 0 0 0 1 NE 0 0 1 0 0 0 1 ENE 0 1 0 0 1 0 2 E 0 0 1 3 0 0 4 ESE 0 1 0 0 0 0 1 SE 0 1 0 1 1 0 3 SSE 0 0 0 3 1 0 4 S 0 0 2 1 1 0 4 55W 0 0 6 2 2 0 10 SW 0 4 0 3 1 0 8 WSW 0 0 1 1 0 0 2 W 0 0 3 0 0 0 3 WNW 0 1 0 0 1 1 3 NW 0 1 1 1 0 0 3 NNW 0 0 2 0 1 0 3 Variable 0 0 0 0 0 0 0 Total 1 9 18 15 9 1 53 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 0 F-52

Byron Generating Station Period of Record: October - December, 2017 Stability Class - Neutral - 250Ft - 3Oft Delta-T (F)

Winds Measured at 250 Feet Wind Speed (in mph)

Wind Direction 13 47 812 1318 1924 > 24 Total N 1 6 15 14 8 0 44 NNE 0 11 14 38 3 0 66 NE 0 1 8 6 6 0 21 ENE 0 9 13 15 3 0 40 E 3 9 20 1 0 0 33 ESE 1 4 14 10 1 0 30 SE 1 5 14 12 13 2 47 SSE 0 5 23 47 18 3 96 S 0 5 12 14 16 6 53 55W 1 4 12 13 15 8 53 SW 0 8 20 22 8 0 58 WSW 3 11 19 41 11 6 91 W 1 11 11 33 27 16 99 WNW 4 5 20 78 33 13 153 NW 2 12 28 66 33 9 150 NNW 2 15 16 26 24 3 86 Variable 0 0 0 0 0 0 0 Total 19 121 259 436 219 66 1120 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 Generating Station Period of Record: October - December, 2017 Stability Class - Slightly Stable 250Ft 3OFt DeltaT (F)

Winds Measured at 250 Feet Wind Speed (in mph)

Wind Direction 13 47 812 1318 1924 > 24 Total N 0 2 13 8 0 0 23 NNE 0 3 3 18 0 0 24 NE 1 2 1 5 0 0 9 ENE 1 1 2 10 1 0 15 E 1 2 9 7 1 0 20 555 0 0 4 7 4 0 15 SE 1 1 1 8 6 1 18 SSE 0 6 10 24 46 11 97 S 0 6 12 22 24 17 81 55W 1 1 15 26 29 18 90 SW 1 4 18 35 23 4 85 WSW 2 1 16 23 6 5 53 W 0 3 10 22 8 3 46 WNW 0 5 19 40 7 0 71 NW 0 3 20 32 7 0 62 NNW 0 4 17 15 3 0 39 Variable 0 0 0 0 0 0 0 Total 8 44 170 302 165 59 748 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-54

Byron Generating Station Period of Record: October - December, 2017 Stability Class - Moderately Stable 250Ft - 3OFt DeltaT (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 0 4 3 1 0 9 NNE 0 0 0 1 0 0 1 NE 0 0 1 0 0 0 1 ENE 0 0 0 0 0 0 0 E 0 1 1 0 0 0 2 ESE 0 1 0 0 3 0 4 SE 0 2 2 1 8 1 14 555 0 2 4 6 8 1 21 S 0 0 1 6 6 0 13 55W 0 0 1 11 9 0 21 SW 0 0 2 9 4 0 15 WSW 0 0 7 1 0 0 8 W 0 0 4 2 0 0 6 WNW 0 1 4 5 0 0 10 NW 1 0 3 0 0 0 4 NNW 0 3 3 0 0 0 6 Variable 0 0 0 0 0 0 0 Total 2 10 37 45 39 2 135 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-55

Byron Generating Station Period of Record: October December, 2017 Stability Class - Extremely Stable - 250Ft - 3OFt Delta-T (F)

Winds Measured at 250 Feet Wind Speed (in mph)

Wind Direction 13 47 812 1318 1924 > 24 Total N 0 1 1 1 0 0 3 NNE 1 0 3 2 0 0 6 NE 0 0 0 0 0 0 0 ENE 0 0 0 0 0 0 0 E 1 0 0 0 0 0 1 ESE 0 1 0 0 0 0 1 SE 0 1 1 0 3 0 5 SSE 0 1 1 2 0 0 4 S 0 0 0 2 3 0 5 55W 1 1 3 3 5 0 13 SW 0 1 6 2 1 0 10 WSW 0 2 4 0 0 0 6 W 0 3 0 0 0 0 3 WNW 0 1 0 0 0 0 1 NW 0 2 10 1 0 0 13 NNW 0 2 2 2 0 0 6 Variable 0 0 0 0 0 0 0 Total 3 16 31 15 12 0 77 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 is no errata data for 2017.

Intentionally left blank APPENDIX H ANNUAL RADIOLOGICAL GROUNDWATER PROTECTION PROGRAM REPORT (ARGPPR)

Intentionally left blank NRCDocket No: 50-454 50-455 BYRON NUCLEAR GENERATING STATION UNITS land 2 Annual Radiological Groundwater Protection Program Report 1 January Through 31 December 2017 Prepared By Teledyne Brown Engineering Environmental Services

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Byron Nuclear Generating Station Byron, IL 61010 April 2018

Intentionally left blank Table Of Contents I. Summary and Conclusions .

I II. Introduction .

3 A. Objectives of the RGPP .

3 B. Implementation of the Objectives .

3 C. Program Description .

4 D. Characteristics of Tritium (H-3) . 4 III. Program Description 5 A. Sample Analysis 5 B. Data Interpretation 5 C. BackgroundAnalysis 6 I Background Concentrations of Tritium 7

IV. Results and discussion 8 A. GroundwaterResults 8 B. Drinking Water Well Survey I0 C. Summary of Results Inter-laboratory Comparison Program I0 D. Leaks, Spills, and Releases 10 E. Trends 10 F. Investigations 10 G. ActionsTaken 10

Appendices Appendix A Location Designation Tables Table A-I Radiological Groundwater Protection Program Sampling Locations, Distance and Direction, Byron Nuclear Generating Station, 2017 Figures Figure A-I Monitoring Well Locations, Byron Nuclear Generating Station, 2017 (Extra wells noted on map are for reference only.)

Appendix B Data Tables Tables Table B-l.1 Concentrations ofTritium, Strontium, Gross Alpha, and Gross Beta in Groundwater Samples Collected in the Vicinity of Byron Nuclear Generating Station, 2017 Table B-l.2 Concentrations of Gamma Emitters in Groundwater Samples Collected in the Vicinity of Byron Nuclear Generating Station, 2017

Summary and Conclusions In 2006, Exelon instituted a comprehensive monitoring program to evaluate the impact of station operations on groundwater in the vicinity of Byron Nuclear Generating Station. The monitoring was conducted in two phases. Phase I 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 Nuclear Generating Station had been adversely impacted by any releases of radionuclides. Phase 1 was conducted by Conestoga Rovers and Associates (CPA) 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 I and begin long-term monitoring at groundwater locations selected during Phase I This is the ninth in a series of annual reports on the status of the Radiological Groundwater Protection Program (RGPP) conducted at Byron Nuclear Generating Station. This report covers groundwater and surface water samples collected from the environment both on and off station property in 2017. During thattime period, 121 analyses were performed on 54 samples from 16 locations.

Gamma-emitting radionuclides associated with licensed plant operations were not detected at concentrations greater than their respective Lower Limits of Detection (LLDs) as specified in the Offsite Dose Calculation Manual (ODCM) in any of the groundwater samples tested. In the case of tritium, Exelon specified that its laboratories achieve a lower limit of detection I 0 times lower than that required by federal regulation.

In 2017, one surface water and fifteen (15) Radiological Groundwater Protection Program (RGPP) monitoring wells were sampled. The samples were obtained throughout the year and analyzed for tritium. In addition, for the samples obtained in June, a study of gamma, beta, and alpha radioisotopes was performed in accordance with Nuclear Energy Institute (NEI) 07-07, Groundwater Protection Initiative. Three wells contained levels of tritium above the lower limit of detection (LLD) of 200 pCi/L. They were: AR-4, with concentrations ranging from 239 443 pCi/L; AR-7, with concentrations ranging from <1 78 431 pCi/L; and AR-I I with concentrations ranging from 554 785 pCi/L. Wells AR-4 and AR-I I are near the Circulating Water Blowdown piping, where historical leakage through vacuum breakers was known to have occurred. Tritium concentrations in these wells have gradually decreased since being first sampled in 2006. Well AR-7 is located on-site, just west of plant structures. Tritium has been measured in this well just above detectable limits on an intermittent basis since the well was first drilled in 2006. The tritium present in this well is at or below tritium levels that have been measured in rainwater as a result of precipitation recapture from permitted gaseous releases and it is not believed to be the result of new leak(s).

In August 2014, a break in the AR-f well piping was discovered about six feet below the surface that could have served as the entry point for tritium in the 1

recapture water. Should the water in these aquifers migrate to off-site wells used for drinking, the off-site dose consequence from tritium present in any of these three wells would be negligible. There are no existing or new leaks evident at the site and all groundwater well sample results are well below the drinking water standard of 20,000 pCi/L tritium.

Strontium-89 (Sr-89) and Strontium-90 (Sr-90) were not detected in any samples above their respective LLDs of I 0 and I pC1IL.

Gross Alpha and Gross Beta analyses in the dissolved and suspended fractions were performed on groundwater samples during the second quarter sampling in 2017.

Gross Alpha (dissolved) was not detected in any groundwater locations. Gross Alpha (suspended) was not detected in any groundwater locations.

Gross Beta (dissolved) was detected in six of fifteen groundwater locations. The concentrations ranged from 2.3 to 19.5 pCiIL. Gross Beta (suspended) was not detected in any groundwater locations.

The concentrations of Gross Alpha and Gross Beta, which are slightly above detectable levels, are considered to be background and are not the result of plant effluents.

Hard-To-Detect analyses were not performed in 2017.

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

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 I ,268 and 1 ,241 MW gross, respectively. Unit One loaded fuel in November 1 984 and went on line February 2, 1985. Unit Two went on line January 9, 1987.

This report covers those analyses performed by Teledyne Brown Engineering (TBE) on samples collected in 2017.

A. Objectives of the RGPP The long-term objectives ofthe 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 ofthe Objectives The objectives identified have been implemented at Byron Nuclear Generating Station as discussed below:

I . Exelon and its consultant identified locations as described in the Phase I study. Phase I 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 Nuclear Generating Station reports describe the local hydrogeologic regime. Periodically, the flow patterns on the surface and shallow subsurface are updated based on ongoing measurements.

3. Byron Nuclear Generating Station will continue to perform routine sampling and radiological analysis of water from selected locations.

4. Byron Nuclear Generating Station has implemented new procedures to identify and report new leaks, spills, or other detections with potential radiological significance in a timely manner.

5. Byron Nuclear Generating Station staff and consulting hydrogeologist assess analytical results on an ongoing basis to identify adverse trends.

C. Program Description I . Sample Collection Sample locations can be found in Table AI and Figure AI, Appendix A.

Groundwater Samples of water are collected, managed, transported and analyzed in accordance with approved proced ures following EPA methods. Only groundwater is collected. 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. Wthin 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-f and/or boron-I 0 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.

III. Program Description A. Sample Analysis This section describes the general analytical methodologies used by TEE to analyze the environmental samples for radioactivity for the Byron Nuclear Generating Station RGPP in 2017.

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

I . Concentrations of gamma emitters in groundwater

2. Concentrations of strontium in groundwater

3. Concentrations of tritium in groundwater

4. Concentrations of gross alpha and gross beta in groundwater B. Data Interpretation The radiological data collected prior to Byron Nuclear Generating Station becoming operational were used as a baseline with which these operational data were compared. For the purpose of this report, Byron Nuclear Generating Station was considered operational at initial criticality.

Several factors were important in the interpretation of the data:

I . 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 oftritium 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. Exelon 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.

Exelon 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 Monitoring for Byron Nuclear Generating Nuclear 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.

I 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 I 950s and early I 960s, 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 publicly available databases that provide tritium concentrations in precipitation are Global Network of Isotopes in Precipitation (GNIP) and USEPAs RadNet database. G NIP provides tritium precipitation concentration data for samples collected worldwide from I 960 to 2006.

RadNet provides tritium precipitation concentration data for samples collected at stations throughoutthe 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 I 975 followed by a gradual decline since that time. Tritium concentrations in Midwest precipitation have typically been below I 00 pCiIL since around I 980. 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 I 960s 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 I 00 pCi/L.

The USEPA RadNet surface water data typically has a reported Combined Standard Uncertainty of 35 to 50 pCi/L.

According to USEPA, 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 radio-analytical laboratory is counting tritium results to an Exelon specified LLD of 200 pCi/L. Typically, the lowest positive measurement will be reported within a range of 40 240 pCi/L or 140 +/- I 00 pCi/L. Clearly, these sample results cannot be distinguished as different from background at this concentration.

IV. Results and Discussion A. Groundwater Results Groundwater 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 Samples from all locations were analyzed for tritium activity (Table B-I. I, Appendix B). Tritium values ranged from less than the detection limit to 785 pCi/L. Outside of the station boundary, tritium concentrations were all less than detection limit (<200 pCi/L). This is based on evaluation of groundwater sample results obtained as part of the Byron Station REMP.

In 2017, fifteen (15) Radiological Groundwater Protection Program (RGPP) monitoring wells were sampled. The samples were obtained throughout the year and analyzed for tritium.

In addition, a study of gamma, beta and alpha radioisotopes was performed in accordance with Nuclear Energy Institute (NEI) 07-07, Groundwater Protection Initiative, for the samples obtained in June. Three wells contained levels of tritium above the lower limit of detection (LLD) of 200 pCiIL. They were: AR-4, with concentrations ranging from 239 443 -

pCi/L; AR-f, with concentrations ranging from <178 431 pCi/L; and AR-I I with concentrations ranging from 554 785 pCi/L. Wells AR-4 and AR-I I are near the Circulating Water Blowdown piping, where historical leakage through vacuum breakers was known to have occurred. Tritium concentrations in these wells have gradually decreased since being first sampled in 2006. Well AR-7 is located on-site, just west of plant structures. Tritium has been measured in this well just above detectable limits on an intermittent basis since the well was first drilled in 2006. The tritium present in this well is at or below tritium levels that have been measured in rainwater as a result of precipitation recapture from permitted gaseous releases and it is not believed to be the result of new leak(s). In August 2014, a break in the AR-f well piping was discovered about six feet below the surface that could have served as the entry point for tritium in the recapture water. There are no existing or new leaks evident at the site and all groundwater well sample results are well below the drinking water standard of 20,000 pCi/L tritium. 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 I 0 and I pCi/L.

Gross Alpha and Gross Beta (dissolved and suspended)

Gross Alpha and Gross Beta analyses in the dissolved and suspended fractions were performed on groundwater samples during the second quarter sampling in 2017.

Gross Alpha (dissolved) was not detected in any groundwater locations.

Gross Alpha (suspended) was not detected in any groundwater locations.

Gross Beta (dissolved) was detected in six of fifteen groundwater locations. The concentrations ranged from 2.3 to 19.5 pCi/L. Gross Beta (suspended) was not detected in any groundwater locations.

The concentrations of Gross Alpha and Gross Beta, which are slightly above detectable levels, are considered to be background and are not the result of plant effluents.

Gamma Emitters Gamma-emitting radionuclides associated with licensed plant operations were not detected at concentrations greater than their respective LLDs in any ofthe samples during 2017.

Hard-To-Detect Hard-To-Detect analyses were not performed in 2017.

B. Drinking Water Well Survey No drinking water well surveys were conducted in 2017.

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 2017.

E. Trends Wells AR-4 and AR-I I have shown an overall decrease in tritium concentration since first sampled in 2006. Tritium has been measured in Well AR-f since 2012, however, tritium has been previously measured in this well and it is believed to be the result of precipitation recapture, not the result of a new spill or leak.

F. Investigations There were no investigations that took place in 201 7 as a result of groundwater sample results.

G. Actions Taken I . Compensatory Actions No compensatory actions were initiated in 2017.

2. Installation of Monitoring Wells No new monitoring wells were installed in 2017.

3. Actions to Recover/Reverse Plumes No actions were undertaken to recover/reverse plumes in 2017.

11

Intentionally left blank APPENDIX A LOCATION DESIGNATION

Intentionally Left Blank TABLE A-I : Radiological Groundwater Protection Program Sampling Locations, Distance and Direction, Byron Nuclear Generating Station, 2017 Site Site Type Temporary/Permanent Distance and Direction AR-I Monitoring Well Permanent 036 miles/NNW AR-JO Monitoring Well Permanent 0.28 miles/NE AR-Il Monitoring Well Permanent 1 .36 miles/WNW AR-2 Monitoring Well Permanent 0.6 miles/NW AR-3 Monitoring Well Permanent 0.8 miles/NW AR-4 Monitoring Well Permanent 1 .36 miles/WNW AR-5 Monitoring Well Permanent 1 .92 miles/WNW AR-6 Monitoring Well Permanent 2.04 miles/WNW AR-7 Monitoring Well Permanent 0.04 miles/W AR-8 Monitoring Well Permanent 0.12 miles/S AR-9 Monitoring Well Permanent 024 miles/E CAR-I Monitoring Well Permanent 2.25 miles/WNW CAR-2 Monitoring Well Permanent 1 .52 miles/WNW CAR-3 Monitoring Well Permanent 0.16 miles/SE DF-24 (EPA well) Monitoring Well Permanent 1 .36 miles/WNW GW-9 Monitoring Well Permanent 0.9 miles/WNW MW-J (EPA well) Monitoring Well Permanent 0.6 miles/NW MW-3 (EPA well) Monitoring Well Permanent 0.8 miles/NW TW-13 Monitoring Well Permanent 2.3 miles/WNW TW-14 Monitoring Well Permanent 2.25 miles/WNW TW-15 Monitoring Well Permanent 2.2 miles/WNW Well 7 Monitoring Well Permanent 0.4 miles/SE CROP Surface Water Permanent 0.2 miles NE A-I

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APPENDIX B DATA TABLES

Intentionally left blank TABLE B-I.1 CONCENTRATIONS OF TRITIUM, STRONTIUM, GROSS ALPHA AND GROSS BETA IN GROUNDWATER SAMPLES COLLECTED IN THE VICINITY OF BYRON NUCLEAR GENERATING STATION, 2017 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION SITE DATE H-3 Sr-89 Sr-90 Gr-A (Dis) Gr-A (Sus) Gr-B (Dis) Gr-B (Sus)

AR-I 03/09/17 < 200 AR-l 05/31/17 < 171 < 7.1 < 0.8 < 1.1 < 0.6 < 1.4 < 1.4 AR-i 09/13/17 < 179 AR-I 11/01/17 < 175 AR-2 05/31/17 < 174 AR-2 10/23/17 < 181 AR-3 03/06/1 7 < 191 AR-3 05/31/17 < 176 < 5.9 < 0.9 < 1.1 < 0.5 5.7 +/- 1.2 < 1.5 AR-3 09/11/17 < 177 AR-3 10/23/17 < 177 AR-4 03/06/1 7 443 +/- 134 AR-4 05/31/17 372 +/- 126 < 4.7 < 0.7 < 1.4 < 0.5 3.8 +/- 1.3 < 1.5 AR-4 09/11/17 239 +/- 120 AR-4 10/23/17 317 +/- 126 AR-f 03/09/17 298 +/- 136 AR-7 05/31/17 431 +/- 128 < 4.5 < 0.7 < 3.7 < 0.6 19.5 +/- 2.1 < 1.4 AR-7 09/13/17 230 +/- 118 AR-f 10/31/17 < 178 AR-8 03/09/1 7 < I 95 AR-8 05/31/17 < 170 < 5.1 < 0.7 < 0.9 < 0.6 2.3 +/- 0.8 < 1.4 AR-8 09/13/If < 183 AR-8 10/31/If < 176 AR-9 03/09/1 7 < 192 AR-9 05/31/if < 168 < 4.4 < 0.7 < 1.7 < 0.6 < 1.6 < 1.4 AR-9 09/1 3/1 f < 184 AR-9 10/31/17 < 177 AR-JO 03/09/if < 194 AR-JO 05/31/17 < 172 < 6.9 < 0.9 < 4.4 < 0.5 < 2.2 < 1.5 AR-JO 09/13/17 < 185 AR-JO JJ/OJ/Jf < 175 AR-JJ 03/06/If 785 +/- 158 AR-li 05/31/If 624 +/- 141 < 5.0 < 0.8 < 1.3 < 1.6 5.1 +/- 1.3 < 2.0 AR-li 09/11/If 603 +/- 136 AR-JJ 10/23/If 554 +/- 137 CAR-i 05/31/if < 172 CAR-i 10/23/If < 188 CAR-3 03/09/I 7 < 196 CAR-3 05/31/If < 172 < 4.6 < 0.6 < 1.9 < 0.5 3.3 +/- 1.2 < 1.5 CAR-3 09/13/If < 188 CAR-3 10/31/If < If0 DF-24 03/06/I 7 < 192 DF-24 05/31/If < 171 DF-24 09/11/If < 180 DF-24 I 0/23/i 7 < 184 MW-I 05/31/If < 172 MW-l 10/23/If < 184 MW-3 05/31/If < 170 MW-3 10/23/17 < 1ff TVV-I3 05/31/If < 174 TW-13 10/23/if < 184 CROP* 03/09/If < 191 CROP* 05/31/If < 174 CROP* 09/1 3/1 7 < 185 CROP* 10/31/If < 173

Suface Water Sample Bolded values indicate LLD was not met due to high soilds content in the sample B-i

TABLE B.i.2 CONCENTRATIONS OF GAMMA EMITTERS IN GROUNDWATER SAMPLES COLLECTED IN THE VICINITY OF BYRON NUCLEAR GENERATION STATION, 2017 RESULTS IN UNITS OF PCI/LITER + 2 SIGMA COLLECTION SITE DATE Be-7 K-40 Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 -131 Cs-J34 Cs-137 Ba-NO La-140 AR-i 05/31/17 <62 <149 <7 <9 <12 <6 <10 <7 <10 <15 <7 <6 <35 <13 AR-2 05/31/17 < 66 < 59 < 7 < 8 < 19 < 10 < 17 < ii < 14 < 13 < 9 < 10 < 35 < 9 AR-3 05/31/17 <43 <88 <5 <4 <9 <5 <8 <5 <9 <12 <6 <5 <27 <10 AR-4 05/31/17 <57 <97 <6 <7 <15 <7 <ii <6 <ii <ii <5 <5 <32 <15 AR-7 05/31/17 <64 <63 <7 <8 <16 <8 <16 <8 <13 <14 <7 <7 <39 <ii AR-8 05/31/17 <61 <127 <7 <7 <16 <7 <16 <8 <ii <14 <7 <9 <41 <14 AR-9 05/31/17 <63 <112 <7 <6 <15 <6 <15 <7 <12 <14 <8 <8 <35 <9 AR-b 05/31/17 <73 <46 <5 <6 <ii <7 <ii <7 <ii <14 <8 <8 <29 <15 AR-il 05/31/17 <69 <124 <7 <9 <18 <7 <12 <9 <16 <14 <9 <9 <40 <13 CAR-i 05/31/if <77 <56 <7 <8 <18 <7 <18 <8 <ii <14 <6 <8 <40 <12 CAR-3 05/31/17 <68 <136 <7 <6 <16 <7 <15 <7 <12 <15 <7 <7 <33 <14 TW-i3 05/31117 <54 <63 <8 <7 <16 <8 <ii <7 <12 <14 <6 <8 <37 <12 CROP* 05/31/17 <71 <125 <8 <8 <18 <8 <21 <9 <16 <14 <8 <7 <36 <12

Su[ace Water Sample