Text

2014 Annual Radiological Environmental Operating Report (AREOR)
	ML15133A340
Person / Time
Site:	Byron
Issue date:	05/13/2015
From:	Kearney F; Exelon Generation Co
To:	; Document Control Desk, Office of Nuclear Reactor Regulation
References
	BYRON 2015-0054
	Download: ML15133A340 (207)
	v • d • e

Byron Generating Station Exeton Generation ByronJL6imO9794 www.exeloncorp.com Rd May 13, 2015 LTR: BYRON 2015-0054 File: 1.10.0101 (JD.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 Facility Operating License Nos. NPF-37 and NPF-66 NRC Docket Nos. STN 50-454 and STN 50-455

Subject:

2014 Annual Radiological Environmental Operating Report (AREOR)

In accordance with Technical Specification 5.6.2, Annual Radiological Environmental Operating Report, we are submitting the Annual Radiological Environmental Operating Reort (AREOR) for Byron Station. This report is required to be submitted to the NRC by May 15 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, Site Vice President Byron Generating Station FAKIJG/AC/sg

Attachment:

AREOR Report cc: Regional Administrator NRC Region III

Docket No: 50-454 50-455 BYRON NUCLEAR GENERATING STATION UNITS 1 and 2 Annual Radiological Environmental Operating Report 1 January Through 31 December 2014 Prepared By Teledyne Brown Engineering Environmental Services Byron Nuclear Generating Station Byron, IL 61010 May 2015 Page 1 of 206

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Table Of Contents I. Summary and Conclusions ............................................................................................ 1 II. Introduction .................................................................................................................... 3 A. Objectives of the REMP ...................................................................................... 3 B. Implementation of the Objectives ........................................................................ 3 III. Program Description ..................................................................................................... 3 A. Sample Collection................................................................................................ 3 B. Sample Analysis .................................................................................................. 6 C. Data Interpretation ............................................................................................... 6 D. Program Exceptions ............................................................................................ 8 E. Program Changes ............................................................................................... 9 IV. Results and Discussion .............................................................................................. 10 A. Aquatic Environment.......................................................................................... 10

1. Surface Water ..................................................................................... 10

2. Ground Water...................................................................................... 10

3. Fish ......................................................................................................... 11

4. Sediment................................................................................................. 11 B. Atmospheric Environment ................................................................................. 12

1. Airborne .................................................................................................. 12

a. Air Particulates ............................................................................. 12

b. Airborne Iodine............................................................................. 13

2. Terrestrial ................................................................................................ 13

a. Milk .................................................................................................. 13

b. Vegetation.................................................................................... 13 C. Ambient Gamma Radiation ............................................................................... 14 D. Land Use Survey ............................................................................................... 14 E. Errata Data ........................................................................................................ 15 F. Summary of Results - Inter-laboratory Comparison Program ........................... 15

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Appendices Appendix A Radiological Environmental Monitoring Report Summary Tables Table A-1 Radiological Environmental Monitoring Program Summary for Byron Nuclear Generating Station, 2014 Appendix B Location Designation, Distance & Direction, and Sample Collection &

Analytical Methods Tables Table B-1 Radiological Environmental Monitoring Program - Sampling Locations, Distance and Direction, Byron Nuclear Generating Station, 2014 Table B-2 Radiological Environmental Monitoring Program - Summary of Sample Collection and Analytical Methods, Byron Nuclear Generating Station, 2014 Figures Figure B-1 Inner and Outer Ring OSLD Locations of the Byron Nuclear Generating Station, 2014 Figure B-2 Onsite Air Sampling Locations of the Byron Nuclear Generating Station, 2014 Figure B-3 Offsite Air Sampling Locations of the Byron Nuclear Generating Station, 2014 Figure B-4 Ingestion and Waterborne Exposure Pathway Sampling Locations of the Byron Nuclear Generating Station, 2014 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, 2014.

Table C-I.2 Concentrations of Tritium in Surface Water Samples Collected in the Vicinity of Byron Nuclear Generating Station, 2014.

Table C-I.3 Concentrations of Nickel-63 in Surface Water Samples Collected in the Vicinity of Byron Nuclear Generating Station, 2014

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Table C-I.4 Concentrations of Gamma Emitters in Surface Water Samples Collected in the Vicinity of Byron Nuclear Generating Station, 2014 Table C-II.1 Concentrations of Tritium in Ground Water Samples Collected in the Vicinity of Byron Nuclear Generating Station, 2014.

Table C-II.2 Concentrations of Gamma Emitters in Ground Water Samples Collected in the Vicinity of Byron Nuclear Generating Station, 2014.

Table C-III.1 Concentrations of Nickel-63 and Gamma Emitters in Fish Samples Collected in the Vicinity of Byron Nuclear Generating Station, 2014.

Table C-IV.1 Concentrations of Nickel-63 and Gamma Emitters in Sediment Samples Collected in the Vicinity of Byron Nuclear Generating Station, 2014.

Table C-V.1 Concentrations of Gross Beta in Air Particulate Samples Collected in the Vicinity of Byron Nuclear Generating Station, 2014.

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, 2014.

Table C-V.3 Concentrations of Gamma Emitters in Air Particulate Samples Collected in the Vicinity of Byron Nuclear Generating Station, 2014.

Table C-VI.1 Concentrations of I-131 in Air Iodine Samples Collected in the Vicinity of Byron Nuclear Generating Station, 2014.

Table C-VII.1 Concentrations of I-131 in Milk Samples Collected in the Vicinity of Byron Nuclear Generating Station, 2014.

Table C-VII.2 Concentrations of Gamma Emitters in Milk Samples Collected in the Vicinity of Byron Nuclear Generating Station, 2014.

Table C-VIII.1 Concentrations of Gamma Emitters in Vegetation Samples Collected in the Vicinity of Byron Nuclear Generating Station, 2014.

Table C-IX.1 Quarterly OSLD Results for Byron Nuclear Generating Station, 2014.

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, 2014.

Table C-IX.3 Summary of the Ambient Dosimetry Program for Byron Nuclear Generating Station, 2014.

Figures Figure C-1 Surface Water - Gross Beta - Stations BY-12 and BY-29 (C) Collected in the Vicinity of BNGS, 2000 - 2014.

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Figure C-2 Surface Water - Tritium - Stations BY-12 and BY-29 (C) Collected in the Vicinity of BNGS, 2000 - 2014.

Figure C-3 Ground Water - Tritium - Station BY-14-1 Collected in the Vicinity of BNGS, 2000 - 2014.

Figure C-4 Ground Water - Tritium - Stations BY-18-1 Collected in the Vicinity of BNGS, 2010 - 2014.

Figure C-5 Ground Water - Tritium - Station BY-32 Collected in the Vicinity of BNGS, 2000 - 2014.

Figure C-6 Ground Water - Tritium - Station BY-35 and BY-36 Collected in the Vicinity of BNGS, 2006 - 2014.

Figure C-7 Ground Water - Tritium - Station BY-37 Collected in the Vicinity of BNGS, 2006 - 2014.

Figure C-8 Air Particulate - Gross Beta - Stations BY-08 (C) and BY-21 Collected in the Vicinity of BNGS, 2000 - 2014.

Figure C-9 Air Particulate - Gross Beta - Stations BY-22 and BY-23 Collected in the Vicinity of BNGS, 2000 - 2014.

Figure C-10 Air Particulate - Gross Beta - Station BY-24 Collected in the Vicinity of BNGS, 2000 - 2014.

Figure C-11 Air Particulate - Gross Beta - Station BY-01 and BY-04 Collected in the Vicinity of BNGS, 2005 - 2014.

Figure C-12 Air Particulate - Gross Beta - Station BY-06 Collected in the Vicinity of BNGS, 2005 - 2014.

Appendix D Inter-Laboratory Comparison Program Tables Table D-1 Analytics Environmental Radioactivity Cross Check Program Teledyne Brown Engineering, 2014 Table D-2 ERA Environmental Radioactivity Cross Check Program Teledyne Brown Engineering, 2014 Table D-3 DOEs Mixed Analyte Performance Evaluation Program (MAPEP)

Teledyne Brown Engineering, 2014 Appendix E Effluent Report Appendix E-1 Data Tables and Figures

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Appendix F Meteorological Data Appendix G Errata data Appendix H Annual Radiological Groundwater Protection Program Report (ARGPPR)

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I. Summary and Conclusions This report on the Radiological Environmental Monitoring Program conducted for the Byron Nuclear Generating Station by Exelon covers the period 1 January 2014 through 31 December 2014. During that time period, 1,453 analyses were performed on 1,307 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-137 activity was detected at both sediment locations. Low levels of Cs-137 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 I-131 analyses were performed on weekly air samples. All results were less than the minimum detectable concentration for I-131.

Cow milk samples were analyzed for concentrations of I-131 and gamma emitting nuclides. All I-131 results were below the minimum detectable activity.

No fission or activation products were found.

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

Environmental gamma radiation measurements were performed quarterly using Optically Stimulated Luminescence Dosimeters (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).

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II. Introduction Byron Station, a two-unit PWR station, is located about two miles east of the Rock River and approximately three miles southwest of Byron in Ogle County, Illinois. The reactors are designed to have capacities of 1,268 and 1,241 MW gross, respectively. Unit One loaded fuel in November 1984 and went on line February 2, 1985. Unit Two went on line January 9, 1987. The station has been designed to keep releases to the environment at levels below those specified in the codes of federal regulations.

This report covers those analyses performed by Teledyne Brown Engineering (TBE) and Landauer on samples collected during the period 1 January 2014 through 31 December 2014.

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

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

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

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

1. Identifying significant exposure pathways.

2. Establishing baseline radiological data of media within those pathways.

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

III. 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 Page 11 of 206

samples for the BNGS REMP in 2014. Sample locations and descriptions can be found in Table B-1 and Figures B-1 through B-4, Appendix B.

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

Two gallon water samples were collected weekly from two surface water locations (BY-12 and BY-29 [Control location]) and quarterly from six ground water locations (BY-14-1, BY-18-1, BY-32, BY-35, BY-36 and BY-37). 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, smallmouth bass, shorthead redhorse, channel catfish and common carp were collected semiannually at two locations, BY-29 (control) and BY-31. Sediment samples composed of recently deposited substrate were collected at two locations semiannually, BY-12 and BY-34 (control).

Atmospheric Environment The atmospheric environment was evaluated by performing radiological analyses on samples of air particulate, and airborne iodine. Airborne iodine and particulate samples were collected and analyzed weekly at eight locations (BY-01, BY-04, BY-06, BY-08, BY-21, BY-22, BY-23 and BY-24). The control location was BY-08. Airborne iodine and particulate samples were obtained at each location, using a vacuum pump with charcoal and glass fiber filters attached. The pumps were run continuously and sampled air at the rate of approximately one cubic foot per minute. The air filters and air iodine samples were replaced weekly and sent to the laboratory for analysis.

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

Food products were collected annually in August at five locations (BY-Control, BY-Quad 1, BY-Quad 2, BY-Quad 3 and BY-Quad 4).

Various types of samples were collected and placed in new unused plastic bags, and sent to the laboratory for analysis.

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Ambient Gamma Radiation Beginning in 2012, Exelon changed the type of dosimetry used for the Radiological Environmental Monitoring Program (REMP). 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-101, BY-102, BY-103, BY-104, BY-105, BY-106, BY-107, BY-108, BY-109, BY-110, BY-111, BY-112, BY-113, BY-114, BY-115 and BY-116) near and within the site perimeter representing fence post doses (i.e., at locations where the doses will be potentially greater than maximum annual off-site doses) from 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-210, BY-211, BY-212, BY-213, BY-214, BY-215 and BY-216) extending to approximately 5 miles from the site designed to measure possible exposures to close-in population.

A special interest set consisting of seven locations (BY-301-1, BY-302-1, BY-309-1, BY-309-2, BY-309-3, BY-309-4 and BY-314-1) to measure possible exposures from on-site storage facilities.

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

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

The specific OSLD locations were determined by the following criteria:

1. The presence of relatively dense population;

2. Site meteorological data taking into account distance and elevation for each of the sixteen-22 1/2 degree sectors around the site, where estimated annual dose from BNGS, if any, would be most significant; Page 13 of 206

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.

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 TBE to analyze the environmental samples for radioactivity for the BNGS REMP in 2014. The analytical procedures used by the laboratory are listed in Table B-2.

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

1. Concentrations of beta emitters in surface water and air particulates.

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

3. Concentrations of tritium in ground and surface water.

4. Concentrations of I-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:

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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 BNGS 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-131, Cs-134, Cs-137, Ba-140 and La-140 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-134, Cs-137, Ba-140 and La-140 were reported.

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

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D. Program Exceptions For 2014 the BNGS REMP had a sample recovery rate in excess of 98%.

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

Table D-1 LISTING OF SAMPLE ANOMALIES Sample Location Collection Reason Type Code Date WG BY-18-1 01/14/14 No sample - water turned off and no answer at house; obtained on 03/08/14.

WG BY-32 01/14/14 No sample - water turned off and no answer at house; obtained on 03/04/14.

A/I BY-24 01/28/14 Unable to obtain sample due to blocked access road; obtained on 01/29/14.

OSLD BY-22-1 02/24/14 OSLD found on ground (plastic case torn);

rehung.

OSLD BY-22-1 04/01/14 Result greater than 3 sigma (outlier).

A/I BY-04 04/29/14 Replaced vacuum gauge due to broken needle.

A/I BY-04, BY-06 07/01/14 Lower timer reading due to power outage from storms.

A/I All locations 07/08/14 Rotameter not delivered in time to perform scheduled field checks; performed on 07/15/14.

A/I BY-01 07/15/14 Low timer reading due to circuit breaker trip as a result of storms.

A/I BY-04 08/19/14 Vacuum gauge found not working; replaced.

A/I BY-01 11/04/14 Timer would not reset; replaced.

A/I BY-23 12/02/14 Timer would not reset; replaced.

A/I BY-22 12/22/14 Timer would not reset; replaced.

OSLD All locations 12/29/14 Collector unable to exchange; dosimeters exchanged 01/11/15 - 01/15/15.

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Table D-2 LISTING OF MISSED SAMPLES Sample Location Collection Reason Type Code Date SW BY-12, BY-29 01/08/14 Sample unobtainable due to ice on river.

SW BY-12, BY-29 01/14/14 Sample unobtainable due to ice on river.

SW BY-12, BY-29 01/20/14 Sample unobtainable due to ice on river.

SW BY-12, BY-29 01/28/14 Sample unobtainable due to ice on river.

SW BY-12, BY-29 02/04/14 Sample unobtainable due to ice on river.

SW BY-12, BY-29 02/11/14 Sample unobtainable due to ice on river.

SW BY-12, BY-29 02/18/14 Sample unobtainable due to ice on river.

SW BY-12, BY-29 02/24/14 Sample unobtainable due to ice on river.

SW BY-12, BY-29 03/04/14 Sample unobtainable due to ice on river.

SW BY-29 03/11/14 Sample unobtainable due to ice on river.

SW BY-12, BY-29 11/18/14 Sample unobtainable due to ice on river.

SW BY-12, BY-29 11/24/14 Sample unobtainable due to ice on river.

SW BY-12, BY-29 12/02/14 Sample unobtainable due to ice on river.

OSLD BY-309-4 12/31/14 Fourth quarter dosimeter lost in transit, no sample results.

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 are no program changes in 2014.

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IV. Results and Discussion A. Aquatic Environment

1. Surface Water Samples were taken weekly and composited monthly at two locations (BY-12 and BY-29). Of these locations only BY-12 located downstream, could be affected by Byron Nuclear Generating Stations effluent releases. The following analyses were performed.

Gross Beta Samples from both locations were analyzed for concentrations of gross beta (Table C-I.1, Appendix C). The values ranged from 3.0 to 7.6 pCi/l. Concentrations detected were consistent with those detected in previous years (Figure C-1, Appendix C).

Tritium Quarterly composites of weekly collections were analyzed for tritium activity (Table C-I.2, Appendix C). Tritium was detected in two samples. The concentrations ranged from 352 - 985 pCi/L (Figure C-2, 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 C-I.3, Appendix C). All results were less than the minimum detectable concentration.

Gamma Spectrometry Samples from both locations were analyzed for gamma emitting nuclides (Table C-I.4, Appendix C). No nuclides were detected, and all required LLDs were met.

2. Ground Water Quarterly grab samples were collected at six locations (BY-14-1, BY-18-1, BY-32, BY-35, BY-36 and BY-37). These locations could be affected by Byron Nuclear Generating Stations effluent releases. The following analyses were performed:

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

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

3. Fish Fish samples comprised of freshwater drum, shorthead redhorse, smallmouth bass, channel catfish 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 Nickel-63 (Table C-III.1, Appendix C). Nickel-63 was not detected and the required LLD was met.

Gamma Spectrometry The edible portion of fish samples from both locations was analyzed for gamma emitting nuclides (Table C-III.1, Appendix C).

No nuclides were detected, and all required LLDs were met.

4. Sediment Aquatic sediment samples were collected at two locations (BY-12 and BY-34) semiannually. BY-12, located downstream, could be affected by Byron Nuclear Generating Stations effluent releases.

The following analyses were performed:

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

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Gamma Spectrometry Sediment samples from both locations were analyzed for gamma emitting nuclides (Table C-IV.1, Appendix C). Cesium-137 was detected in three samples. The concentrations ranged from 68 to 183 pCi/kg dry. Concentrations detected were consistent with those detected in previous years and are not a result of plant effluents. No other nuclides were detected, and all required LLDs were met.

B. Atmospheric Environment

1. Airborne

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

Gross Beta Weekly samples were analyzed for concentrations of beta emitters (Table C-V.1 and C-V.2, Appendix C).

Detectable gross beta activity was observed at all locations.

Comparison of results among the three groups aid in determining the effects, if any, resulting from the operation of BNGS. The results from the Nearsite locations (Group I) ranged from 6 to 37 E-3 pCi/m3 with a mean of 17 E-3 pCi/m3. The results from the Far Field locations (Group II) ranged from 5 to 37 E-3 pCi/m3 with a mean of 17 E-3 pCi/m3. The results from the Control location (Group III) ranged from 8 to 37 E-3 pCi/m3 with a mean of 19 E-3 pCi/m3. Comparison of the 2014 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 2014 indicate no notable differences among the three groups (Figures C-8 through C-12, Appendix C).

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

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

2. Terrestrial

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

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

Gamma Spectrometry Each milk sample was analyzed for concentrations of gamma emitting nuclides (Table C-VII.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 1, BY-Quad 2, BY-Quad 3 and BY-Quad 4) when available. Four locations (BY-Quad 1, 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:

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

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

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

All OSLD measurements were below 30 mR/standard quarter, with a range of 17 to 29 mR/standard quarter. A comparison of the Inner Ring, Outer Ring, Special Interest, Other and Control Location data indicate that the ambient gamma radiation levels were comparable among the groups.

D. Land Use Survey A Land Use Survey conducted during August 2014 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 1/2 degree sectors and garden in each of the four 90 degree quadrants around the site. The results of this survey are summarized below.

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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 6.1 -

C NE 1.1 4.7 -

D ENE 1.4 3.5 -

E E 1.2 4.1 -

F ESE 1.5 1.5 -

G SE 1.7 4.3 -

H SSE 0.7 3.5 -

J S 0.6 0.7 -

K SSW 0.7 1.9 -

L SW 0.8 2.1 -

M WSW 1.7 0.8 4.5 N W 1.8 3.4 -

P WNW 1.6 6.2 11.5 Q NW 0.9 3.8 -

R NNW 0.9 1.4 -

E. Errata Data AREOR reports from 2010-2013 contained errors in the Appendix E, Section 1.2, Liquids Released to the Rock River, summary information.

The maximum quarterly average concentrations reported for fission and activation products, tritium, and dissolved and entrained gases were incorrectly summed between the Unit 1 and Unit 2 quarterly average concentrations, which are identical because liquid releases are divided evenly between the two units. The original and corrected quarterly average concentrations are summarized in Appendix G:

F. Summary of Results - Inter-Laboratory Comparison Program The primary laboratories analyzed Performance Evaluation (PE) samples of air particulate, air iodine, milk, soil, vegetation and water matrices (Appendix D). The PE samples, supplied by Analytics Inc., Environmental Resource Associates (ERA) and DOEs Mixed Analyte Performance Evaluation Program (MAPEP), were evaluated against the following pre-set acceptance criteria:

1. Analytics Evaluation Criteria Analytics evaluation report provides a ratio of laboratory results and Analytics known value. Since flag values are not assigned by Analytics, TBE-ES evaluates the reported ratios based on internal Page 23 of 206

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.

The MAPEP defines three levels of performance: Acceptable (flag = A), Acceptable with Warning (flag = W), and Not Acceptable (flag = N). Performance is considered acceptable when a mean result for the specified analyte is +/- 20% of the reference value. Performance is acceptable with warning when a mean result falls in the range from +/-20% to +/-30% of the reference value (i.e., 20% < bias < 30%). If the bias is greater than 30%, the results are deemed not acceptable.

In reviewing our environmental inter-laboratory crosscheck programs, we identified 1) duplication of efforts on some matrices and isotopes and 2) that we are performing crosscheck samples on some matrices and isotopes that we do not perform for clients. Since the DOE MAPEP is designed to evaluate the ability of analytical facilities to correctly analyze for radiological constituents representative of those at DOE sites, the needed changes were made to the MAPEP program. Therefore, the following isotopes were removed from the MAPEP program:

Soil - gamma - will be provided by Analytics twice per year, starting in 2015. For 2014, one soil gamma is provided by MAPEP, the 2nd soil gamma is provided by Analytics.

AP - gamma - is currently provided by Analytics.

Water - gamma, H-3, Sr-90, uranium, gross alpha and gross beta currently provided by ERA.

MAPEP evaluates non-reported (NR) analyses as failed if they were Page 24 of 206

reported in the previous series.

For the TBE laboratory, 163 out of 169 analyses performed met the specified acceptance criteria. Six analyses (Ni-63, K-40 and I-131 in water, and two Sr-90s and one Gross Alpha in AP samples) did not meet the specified acceptance criteria for the following reasons:

1. Teledyne Brown Engineerings MAPEP March 2014 Ni-63 in water result of 32.7 +/- 1.69 Bq/L was overlooked when reporting the data but would have passed the acceptance range of 23.9 - 44.2 Bq/L.

NCR 14-04

2. Teledyne Brown Engineerings MAPEP March 2014 K-40 in water result of 1.63 +/- 2.49 Bq/L was overlooked when reporting the data but would have passed the false positive test. NCR 14-04

3. Teledyne Brown Engineerings ERA November 2014 I-131 in water result of 15.8 pCi/L was lower than the known value of 20.3 pCi/L, failing below the lower acceptance limit of 16.8. The result was evaluated as failed with a found to known ratio of 0.778. No cause could be found for the slightly low result. All ERA I-131 evaluations since 2004 have been acceptable. NCR 14-08

4. Teledyne Brown Engineerings MAPEP March 2014 Sr-90 in AP result of 0.822 Bq/sample was lower than the known value of 1.18 Bq/sample, failing below the lower acceptance limit of 0.83 Bq/sample. The rerun result was still low, but fell within the lower acceptance range of 0.836. The rerun result was statistically the same number as the original result. No cause could be found for the slightly low results. NCR 14-04

5. Teledyne Brown Engineerings MAPEP September 2014 Sr-90 in AP result of 0.310 Bq/sample was lower than the known value of 0.703 Bq/sample. The gravimetric yield of 117% was very high (we normally see yields of 60% to 70 %) and could account for the low activity. NCR 14-09

6. Teledyne Brown Engineerings MAPEP September 2014 Gr-Alpha in AP result of 0.153 Bq/sample was lower than the known value of 0.53 Bq/sample. The AP sample was counted on the wrong side.

The AP was flipped over and recounted with acceptable results.

NCR 14-09 The Inter-Laboratory Comparison Program provides evidence of in control counting systems and methods, and that the laboratories are producing accurate and reliable data.

Page 25 of 206

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APPENDIX A RADIOLOGICAL ENVIRONMENTAL MONITORING REPORT

SUMMARY

Page 27 of 206

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TABLE A-1 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANNUAL

SUMMARY

FOR BYRON NUCLEAR GENERATION STATION, 2014 NAME OF FACILITY: BYRON DOCKET NUMBER: 50-454 & 50-455 2014 LOCATION OF FACILITY: BYRON; IL REPORTING PERIOD:

INDICATOR CONTROL LOCATION WITH HIGHEST ANNUAL MEAN (M)

LOCATIONS LOCATION MEDIUM OR TYPES OF NUMBER OF REQUIRED MEAN (M) MEAN (M) MEAN (M) STATION # NUMBER OF PATHWAY SAMPLED ANALYSIS ANALYSIS LOWER LIMIT (F) (F) (F) NAME NONROUTINE (UNIT OF PERFORMED PERFORMED OF DETECTION RANGE RANGE RANGE DISTANCE AND DIRECTION REPORTED MEASUREMENT) (LLD) MEASUREMENTS SURFACE WATER GR-B 20 4 5.3 4.9 5.3 BY-12 INDICATOR 0 (PCI/LITER) (9/10) (9/10) (9/10) OREGON POOL OF ROCK RIVER - DOWNSTREAM (3.0/7.6) (3.2/6.7) (3.0/7.6) 4.5 MILES SSW OF SITE H-3 8 200 669 <LLD 669 BY-12 INDICATOR 0 A-1 (2/4) (2/4) OREGON POOL OF ROCK RIVER - DOWNSTREAM (352/985) (352/985) 4.5 MILES SSW OF SITE NI-63 20 30 <LLD <LLD - 0 GAMMA 20 MN-54 15 <LLD <LLD - 0 CO-58 15 <LLD <LLD - 0 FE-59 30 <LLD <LLD - 0 Page 29 of 206 CO-60 15 <LLD <LLD - 0

THE MEAN AND 2 STANDARD DEVIATION VALUES ARE CALCULATED USING THE POSITIVE VALUES FRACTION OF DETECTABLE MEASUREMENTS AT SPECIFIED LOCATIONS IS INDICATED IN PARENTHESES (F)

TABLE A-1 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANNUAL

SUMMARY

FOR BYRON NUCLEAR GENERATION STATION, 2014 NAME OF FACILITY: BYRON DOCKET NUMBER: 50-454 & 50-455 2014 LOCATION OF FACILITY: BYRON; IL REPORTING PERIOD:

INDICATOR CONTROL LOCATION WITH HIGHEST ANNUAL MEAN (M)

LOCATIONS LOCATION MEDIUM OR TYPES OF NUMBER OF REQUIRED MEAN (M) MEAN (M) MEAN (M) STATION # NUMBER OF PATHWAY SAMPLED ANALYSIS ANALYSIS LOWER LIMIT (F) (F) (F) NAME NONROUTINE (UNIT OF PERFORMED PERFORMED OF DETECTION RANGE RANGE RANGE DISTANCE AND DIRECTION REPORTED MEASUREMENT) (LLD) MEASUREMENTS SURFACE WATER ZN-65 30 <LLD <LLD - 0 (PCI/LITER)

NB-95 15 <LLD <LLD - 0 A-2 ZR-95 30 <LLD <LLD - 0 I-131 15 <LLD <LLD - 0 CS-134 15 <LLD <LLD - 0 CS-137 18 <LLD <LLD - 0 Page 30 of 206 BA-140 60 <LLD <LLD - 0 LA-140 15 <LLD <LLD - 0

THE MEAN AND 2 STANDARD DEVIATION VALUES ARE CALCULATED USING THE POSITIVE VALUES FRACTION OF DETECTABLE MEASUREMENTS AT SPECIFIED LOCATIONS IS INDICATED IN PARENTHESES (F)

TABLE A-1 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANNUAL

SUMMARY

FOR BYRON NUCLEAR GENERATION STATION, 2014 NAME OF FACILITY: BYRON DOCKET NUMBER: 50-454 & 50-455 2014 LOCATION OF FACILITY: BYRON; IL REPORTING PERIOD:

INDICATOR CONTROL LOCATION WITH HIGHEST ANNUAL MEAN (M)

LOCATIONS LOCATION MEDIUM OR TYPES OF NUMBER OF REQUIRED MEAN (M) MEAN (M) MEAN (M) STATION # NUMBER OF PATHWAY SAMPLED ANALYSIS ANALYSIS LOWER LIMIT (F) (F) (F) NAME NONROUTINE (UNIT OF PERFORMED PERFORMED OF DETECTION RANGE RANGE RANGE DISTANCE AND DIRECTION REPORTED MEASUREMENT) (LLD) MEASUREMENTS GROUND WATER H-3 24 200 <LLD NA - 0 (PCI/LITER)

GAMMA 24 A-3 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 Page 31 of 206 NB-95 15 <LLD NA - 0 ZR-95 30 <LLD NA - 0

THE MEAN AND 2 STANDARD DEVIATION VALUES ARE CALCULATED USING THE POSITIVE VALUES FRACTION OF DETECTABLE MEASUREMENTS AT SPECIFIED LOCATIONS IS INDICATED IN PARENTHESES (F)

TABLE A-1 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANNUAL

SUMMARY

FOR BYRON NUCLEAR GENERATION STATION, 2014 NAME OF FACILITY: BYRON DOCKET NUMBER: 50-454 & 50-455 2014 LOCATION OF FACILITY: BYRON; IL REPORTING PERIOD:

INDICATOR CONTROL LOCATION WITH HIGHEST ANNUAL MEAN (M)

LOCATIONS LOCATION MEDIUM OR TYPES OF NUMBER OF REQUIRED MEAN (M) MEAN (M) MEAN (M) STATION # NUMBER OF PATHWAY SAMPLED ANALYSIS ANALYSIS LOWER LIMIT (F) (F) (F) NAME NONROUTINE (UNIT OF PERFORMED PERFORMED OF DETECTION RANGE RANGE RANGE DISTANCE AND DIRECTION REPORTED MEASUREMENT) (LLD) MEASUREMENTS GROUND WATER I-131 15 <LLD NA - 0 (PCI/LITER)

CS-134 15 <LLD NA - 0 A-4 CS-137 18 <LLD NA - 0 BA-140 60 <LLD NA - 0 LA-140 15 <LLD NA - 0 FISH NI-63 8 260 <LLD <LLD - 0 (PCI/KG WET)

GAMMA 8 Page 32 of 206 MN-54 130 <LLD <LLD - 0 CO-58 130 <LLD <LLD - 0

THE MEAN AND 2 STANDARD DEVIATION VALUES ARE CALCULATED USING THE POSITIVE VALUES FRACTION OF DETECTABLE MEASUREMENTS AT SPECIFIED LOCATIONS IS INDICATED IN PARENTHESES (F)

TABLE A-1 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANNUAL

SUMMARY

FOR BYRON NUCLEAR GENERATION STATION, 2014 NAME OF FACILITY: BYRON DOCKET NUMBER: 50-454 & 50-455 2014 LOCATION OF FACILITY: BYRON; IL REPORTING PERIOD:

INDICATOR CONTROL LOCATION WITH HIGHEST ANNUAL MEAN (M)

LOCATIONS LOCATION MEDIUM OR TYPES OF NUMBER OF REQUIRED MEAN (M) MEAN (M) MEAN (M) STATION # NUMBER OF PATHWAY SAMPLED ANALYSIS ANALYSIS LOWER LIMIT (F) (F) (F) NAME NONROUTINE (UNIT OF PERFORMED PERFORMED OF DETECTION RANGE RANGE RANGE DISTANCE AND DIRECTION REPORTED MEASUREMENT) (LLD) MEASUREMENTS FISH FE-59 260 <LLD <LLD - 0 (PCI/KG WET)

CO-60 130 <LLD <LLD - 0 A-5 ZN-65 260 <LLD <LLD - 0 NB-95 NA <LLD <LLD - 0 ZR-95 NA <LLD <LLD - 0 CS-134 130 <LLD <LLD - 0 CS-137 150 <LLD <LLD - 0 Page 33 of 206 BA-140 NA <LLD <LLD - 0

THE MEAN AND 2 STANDARD DEVIATION VALUES ARE CALCULATED USING THE POSITIVE VALUES FRACTION OF DETECTABLE MEASUREMENTS AT SPECIFIED LOCATIONS IS INDICATED IN PARENTHESES (F)

TABLE A-1 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANNUAL

SUMMARY

FOR BYRON NUCLEAR GENERATION STATION, 2014 NAME OF FACILITY: BYRON DOCKET NUMBER: 50-454 & 50-455 2014 LOCATION OF FACILITY: BYRON; IL REPORTING PERIOD:

INDICATOR CONTROL LOCATION WITH HIGHEST ANNUAL MEAN (M)

LOCATIONS LOCATION MEDIUM OR TYPES OF NUMBER OF REQUIRED MEAN (M) MEAN (M) MEAN (M) STATION # NUMBER OF PATHWAY SAMPLED ANALYSIS ANALYSIS LOWER LIMIT (F) (F) (F) NAME NONROUTINE (UNIT OF PERFORMED PERFORMED OF DETECTION RANGE RANGE RANGE DISTANCE AND DIRECTION REPORTED MEASUREMENT) (LLD) MEASUREMENTS FISH LA-140 NA <LLD <LLD - 0 (PCI/KG WET)

SEDIMENT NI-63 4 260 <LLD <LLD - 0 A-6 (PCI/KG DRY)

GAMMA 4 MN-54 NA <LLD <LLD - 0 CO-58 NA <LLD <LLD - 0 FE-59 NA <LLD <LLD - 0 CO-60 NA <LLD <LLD - 0 Page 34 of 206 ZN-65 NA <LLD <LLD - 0 NB-95 NA <LLD <LLD - 0

THE MEAN AND 2 STANDARD DEVIATION VALUES ARE CALCULATED USING THE POSITIVE VALUES FRACTION OF DETECTABLE MEASUREMENTS AT SPECIFIED LOCATIONS IS INDICATED IN PARENTHESES (F)

TABLE A-1 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANNUAL

SUMMARY

FOR BYRON NUCLEAR GENERATION STATION, 2014 NAME OF FACILITY: BYRON DOCKET NUMBER: 50-454 & 50-455 2014 LOCATION OF FACILITY: BYRON; IL REPORTING PERIOD:

INDICATOR CONTROL LOCATION WITH HIGHEST ANNUAL MEAN (M)

LOCATIONS LOCATION MEDIUM OR TYPES OF NUMBER OF REQUIRED MEAN (M) MEAN (M) MEAN (M) STATION # NUMBER OF PATHWAY SAMPLED ANALYSIS ANALYSIS LOWER LIMIT (F) (F) (F) NAME NONROUTINE (UNIT OF PERFORMED PERFORMED OF DETECTION RANGE RANGE RANGE DISTANCE AND DIRECTION REPORTED MEASUREMENT) (LLD) MEASUREMENTS SEDIMENT ZR-95 NA <LLD <LLD - 0 (PCI/KG DRY)

CS-134 150 <LLD <LLD - 0 A-7 CS-137 180 183 91 183 BY-12 INDICATOR 0 (1/2) (2/2) (1/2) OREGON POOL OF ROCK RIVER - DOWNSTREAM (68/115) 4.5 MILES SSW OF SITE BA-140 NA <LLD <LLD - 0 LA-140 NA <LLD <LLD - 0 AIR PARTICULATE GR-B 416 10 17 19 19 BY-08 CONTROL 0 (E-3 PCI/CU.METER) (364/364) (52/52) (52/52) LEAF RIVER (5/37) (8/37) (8/37) 6.8 MILES WNW OF SITE GAMMA 32 Page 35 of 206 MN-54 NA <LLD <LLD - 0 CO-58 NA <LLD <LLD - 0

THE MEAN AND 2 STANDARD DEVIATION VALUES ARE CALCULATED USING THE POSITIVE VALUES FRACTION OF DETECTABLE MEASUREMENTS AT SPECIFIED LOCATIONS IS INDICATED IN PARENTHESES (F)

TABLE A-1 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANNUAL

SUMMARY

FOR BYRON NUCLEAR GENERATION STATION, 2014 NAME OF FACILITY: BYRON DOCKET NUMBER: 50-454 & 50-455 2014 LOCATION OF FACILITY: BYRON; IL REPORTING PERIOD:

INDICATOR CONTROL LOCATION WITH HIGHEST ANNUAL MEAN (M)

LOCATIONS LOCATION MEDIUM OR TYPES OF NUMBER OF REQUIRED MEAN (M) MEAN (M) MEAN (M) STATION # NUMBER OF PATHWAY SAMPLED ANALYSIS ANALYSIS LOWER LIMIT (F) (F) (F) NAME NONROUTINE (UNIT OF PERFORMED PERFORMED OF DETECTION RANGE RANGE RANGE DISTANCE AND DIRECTION REPORTED MEASUREMENT) (LLD) MEASUREMENTS AIR PARTICULATE FE-59 NA <LLD <LLD - 0 (E-3 PCI/CU.METER)

CO-60 NA <LLD <LLD - 0 A-8 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 Page 36 of 206 BA-140 NA <LLD <LLD - 0

THE MEAN AND 2 STANDARD DEVIATION VALUES ARE CALCULATED USING THE POSITIVE VALUES FRACTION OF DETECTABLE MEASUREMENTS AT SPECIFIED LOCATIONS IS INDICATED IN PARENTHESES (F)

TABLE A-1 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANNUAL

SUMMARY

FOR BYRON NUCLEAR GENERATION STATION, 2014 NAME OF FACILITY: BYRON DOCKET NUMBER: 50-454 & 50-455 2014 LOCATION OF FACILITY: BYRON; IL REPORTING PERIOD:

INDICATOR CONTROL LOCATION WITH HIGHEST ANNUAL MEAN (M)

LOCATIONS LOCATION MEDIUM OR TYPES OF NUMBER OF REQUIRED MEAN (M) MEAN (M) MEAN (M) STATION # NUMBER OF PATHWAY SAMPLED ANALYSIS ANALYSIS LOWER LIMIT (F) (F) (F) NAME NONROUTINE (UNIT OF PERFORMED PERFORMED OF DETECTION RANGE RANGE RANGE DISTANCE AND DIRECTION REPORTED MEASUREMENT) (LLD) MEASUREMENTS AIR PARTICULATE LA-140 NA <LLD <LLD - 0 (E-3 PCI/CU.METER)

AIR IODINE GAMMA 416 A-9 (E-3 PCI/CU.METER) I-131 70 <LLD <LLD - 0 MILK I-131 38 1 <LLD <LLD - 0 (PCI/LITER)

GAMMA 38 MN-54 NA <LLD <LLD - 0 CO-58 NA <LLD <LLD - 0 FE-59 NA <LLD <LLD - 0 Page 37 of 206 CO-60 NA <LLD <LLD - 0

THE MEAN AND 2 STANDARD DEVIATION VALUES ARE CALCULATED USING THE POSITIVE VALUES FRACTION OF DETECTABLE MEASUREMENTS AT SPECIFIED LOCATIONS IS INDICATED IN PARENTHESES (F)

TABLE A-1 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANNUAL

SUMMARY

FOR BYRON NUCLEAR GENERATION STATION, 2014 NAME OF FACILITY: BYRON DOCKET NUMBER: 50-454 & 50-455 2014 LOCATION OF FACILITY: BYRON; IL REPORTING PERIOD:

INDICATOR CONTROL LOCATION WITH HIGHEST ANNUAL MEAN (M)

LOCATIONS LOCATION MEDIUM OR TYPES OF NUMBER OF REQUIRED MEAN (M) MEAN (M) MEAN (M) STATION # NUMBER OF PATHWAY SAMPLED ANALYSIS ANALYSIS LOWER LIMIT (F) (F) (F) NAME NONROUTINE (UNIT OF PERFORMED PERFORMED OF DETECTION RANGE RANGE RANGE DISTANCE AND DIRECTION REPORTED MEASUREMENT) (LLD) MEASUREMENTS MILK ZN-65 NA <LLD <LLD - 0 (PCI/LITER)

NB-95 NA <LLD <LLD - 0 A-10 ZR-95 NA <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 Page 38 of 206 VEGETATION GAMMA 10 (PCI/KG WET) MN-54 NA <LLD <LLD - 0

THE MEAN AND 2 STANDARD DEVIATION VALUES ARE CALCULATED USING THE POSITIVE VALUES FRACTION OF DETECTABLE MEASUREMENTS AT SPECIFIED LOCATIONS IS INDICATED IN PARENTHESES (F)

TABLE A-1 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANNUAL

SUMMARY

FOR BYRON NUCLEAR GENERATION STATION, 2014 NAME OF FACILITY: BYRON DOCKET NUMBER: 50-454 & 50-455 2014 LOCATION OF FACILITY: BYRON; IL REPORTING PERIOD:

INDICATOR CONTROL LOCATION WITH HIGHEST ANNUAL MEAN (M)

LOCATIONS LOCATION MEDIUM OR TYPES OF NUMBER OF REQUIRED MEAN (M) MEAN (M) MEAN (M) STATION # NUMBER OF PATHWAY SAMPLED ANALYSIS ANALYSIS LOWER LIMIT (F) (F) (F) NAME NONROUTINE (UNIT OF PERFORMED PERFORMED OF DETECTION RANGE RANGE RANGE DISTANCE AND DIRECTION REPORTED MEASUREMENT) (LLD) MEASUREMENTS VEGETATION CO-58 NA <LLD <LLD - 0 (PCI/KG WET)

FE-59 NA <LLD <LLD - 0 A-11 CO-60 NA <LLD <LLD - 0 ZN-65 NA <LLD <LLD - 0 NB-95 NA <LLD <LLD - 0 ZR-95 NA <LLD <LLD - 0 I-131 60 <LLD <LLD - 0 Page 39 of 206 CS-134 60 <LLD <LLD - 0

THE MEAN AND 2 STANDARD DEVIATION VALUES ARE CALCULATED USING THE POSITIVE VALUES FRACTION OF DETECTABLE MEASUREMENTS AT SPECIFIED LOCATIONS IS INDICATED IN PARENTHESES (F)

TABLE A-1 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANNUAL

SUMMARY

FOR BYRON NUCLEAR GENERATION STATION, 2014 NAME OF FACILITY: BYRON DOCKET NUMBER: 50-454 & 50-455 2014 LOCATION OF FACILITY: BYRON; IL REPORTING PERIOD:

INDICATOR CONTROL LOCATION WITH HIGHEST ANNUAL MEAN (M)

LOCATIONS LOCATION MEDIUM OR TYPES OF NUMBER OF REQUIRED MEAN (M) MEAN (M) MEAN (M) STATION # NUMBER OF PATHWAY SAMPLED ANALYSIS ANALYSIS LOWER LIMIT (F) (F) (F) NAME NONROUTINE (UNIT OF PERFORMED PERFORMED OF DETECTION RANGE RANGE RANGE DISTANCE AND DIRECTION REPORTED MEASUREMENT) (LLD) MEASUREMENTS VEGETATION CS-137 80 <LLD <LLD - 0 (PCI/KG WET)

BA-140 NA <LLD <LLD - 0 A-12 LA-140 NA <LLD <LLD - 0 DIRECT RADIATION OSLD-QUARTERLY 363 NA 22.9 19.5 26.1 BY-216-1 INDICATOR 0 (MILLIREM/QTR.) (355/355) (8/8) (4/4) 4.6 MILES NNW (16.9/28.8) (17.5/20.9) (22.5/28.2)

Page 40 of 206

THE MEAN AND 2 STANDARD DEVIATION VALUES ARE CALCULATED USING THE POSITIVE VALUES FRACTION OF DETECTABLE MEASUREMENTS AT SPECIFIED LOCATIONS IS INDICATED IN PARENTHESES (F)

APPENDIX B LOCATION DESIGNATION, DISTANCE & DIRECTION, AND SAMPLE COLLECTION & ANALYTICAL METHODS Page 41 of 206

Intentionally Left Blank Page 42 of 206

TABLE B-1: Radiological Environmental Monitoring Program - Sampling Locations, Distance and Direction, Byron Nuclear Generating Station, 2014 Location Location Description Distance & Direction From Site A.Surface Water BY-12 Oregon Pool of Rock River, Downstream 4.5 miles SSW BY-29 Byron, Upstream (control) 3.0 miles N B.Ground/Well Water BY-14-1 3200 North German Church Road 1.0 miles SSE BY-18-1 Calhoun 0.7 miles SSW BY-32 Ron Wolford Well 1.9 miles W BY-35 Vancko Well 1.9 miles WNW BY-36 Blanchard Well 0.8 miles NW BY-37 Alexander Well 2.0 miles WNW C.Milk BY-20-1 Ron Snodgrass Farm 4.8 miles WSW BY-26-2 Joseph Akins Farm (control) 12.2 miles WNW D.Air Particulates / Air Iodine BY-01 Byron 3.0 miles N BY-04 Paynes Point 5.0 miles SE BY-06 Oregon 4.7 miles SSW BY-08 Leaf River (control) 7.0 miles WNW BY-21 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 SSW 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 6120 Razorville Road, Byron 2.1 miles NNW Control 3933 South Bend Road, New Mulford 10.7 miles NE H.Environmental Dosimetry - OSLD Inner Ring BY-101-1 and -2 0.3 miles N BY-102-1 1.0 miles NNE BY-102-2 1.0 miles NNE B-1 Page 43 of 206

TABLE B-1: Radiological Environmental Monitoring Program - Sampling Locations, Distance and Direction, Byron Nuclear Generating Station, 2014 Location Location Description Distance & Direction From Site H. Environmental Dosimetry - OSLD (continued)

Inner Ring BY-103-1 and -2 1.7 miles NE BY-103-3 0.4 miles NE BY-104-1 and -2 1.4 miles ENE BY-104-3 0.3 miles ENE BY-105-1 and -2 1.3 miles E BY-106-1 and -2 1.4 miles ESE BY-107-1 and -2 1.4 miles SE BY-107-3 0.4 miles SE BY-108-1 0.7 miles SSE BY-108-2 0.6 miles SSE BY-109-1 and -2 0.6 miles S BY-110-1 and -2 0.7 miles SSW BY-111-3 0.8 miles SW BY-111-4 0.9 miles SW BY-112-3 and -4 0.8 miles WSW BY-113-1 and -2 0.7 miles W BY-114-1 and -2 0.8 miles WNW BY-115-1 and -2 1.0 miles NW BY-116-1 and -2 1.4 miles NNW BY-116-3 0.9 miles NNW Outer Ring BY-201-3 4.4 miles N BY-201-4 4.4 miles N BY-202-1 4.4 miles NNE BY-202-2 4.8 miles NNE BY-203-1 4.8 miles NE BY-203-2 4.7 miles NE BY-204-1 4.1 miles ENE BY-204-2 4.0 miles ENE BY-205-1 and -2 3.8 miles E BY-206-1 4.0 miles ESE BY-206-2 4.3 miles ESE BY-207-1 4.2 miles SE BY-207-2 3.9 miles SE BY-208-1 4.0 miles SSE BY-208-2 3.8 miles SSE BY-209-1 and -4 4.0 miles S BY-210-3 and -4 3.9 miles SSW BY-211-1 and -4 4.9 miles SW BY-212-1 and -4 4.7 miles WSW BY-213-1 4.7 miles W BY-213-4 4.7 miles W BY-214-1 4.7 miles WNW BY-214-4 4.6 miles WNW BY-215-1 4.2 miles NW BY-215-4 4.2 miles NW BY-216-1 4.5 miles NNW BY-216-2 4.7 miles NNW B-2 Page 44 of 206

TABLE B-1: Radiological Environmental Monitoring Program - Sampling Locations, Distance and Direction, Byron Nuclear Generating Station, 2014 Location Location Description Distance & Direction From Site Special Interest BY-301-1 0.3 miles N BY-302-1 0.1 miles NNE BY-309-1 0.3 miles S BY-309-2 0.4 miles S BY-309-3 0.4 miles S BY-309-4 0.4 miles SSW BY-314-1 0.3 miles WNW Other BY-01-1 and -2 3.0 miles N BY-04-1 and -2 5.0 miles SE BY-06-1 and -2 4.7 miles SSW BY-21-1 and -2 0.3 miles N BY-22-1 and -2 0.4 miles SE BY-23-1 and -2 0.6 miles S BY-24-1 and -2 0.7 miles SW Control BY-08-1 and -2 7.0 miles WNW B-3 Page 45 of 206

TABLE B-2: Radiological Environmental Monitoring Program - Summary of Sample Collection and Analytical Methods, Byron Nuclear Generating Station, 2014 Sample Analysis Sampling Method Analytical Procedure Number Medium Surface Water Gamma Spectroscopy Monthly composite from TBE, TBE-2007 Gamma emitting radioisotope analysis weekly grab samples.

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

Surface Water Tritium Quarterly composite TBE, TBE-2011 Tritium analysis in drinking water by liquid from weekly grab scintillation samples.

Ground Water Gamma Spectroscopy Quarterly grab samples. TBE, TBE-2007 Gamma emitting radioisotope analysis Ground Water Tritium Quarterly grab samples. TBE, TBE-2011 Tritium analysis in drinking water by liquid scintillation Fish Gamma Spectroscopy Semi-annual samples TBE-2007 Gamma emitting radioisotope analysis collected via electroshocking or other techniques Fish Nickel-63 Semi-annual samples TBE, TBE-2013 Radionickel activity in various matrices collected via electroshocking or other techniques Sediment Gamma Spectroscopy Semi-annual grab TBE, TBE-2007 Gamma emitting radioisotope analysis samples Sediment Nickel-63 Semi-annual grab TBE, TBE-2013 Radionickel activity in various matrices samples Air Particulates Gross Beta One-week composite of TBE, TBE-2008 Gross Alpha and/or gross beta activity in continuous air sampling various matrices through glass fiber filter paper Air Particulates Gamma Spectroscopy Quarterly composite of TBE, TBE-2007 Gamma emitting radioisotope analysis each station Air Iodine Gamma Spectroscopy One-week composite of TBE, TBE-2007 Gamma emitting radioisotope analysis continuous air sampling through charcoal filter Milk I-131 Bi-weekly grab sample TBE, TBE-2012 Radioiodine in various matrices when cows are on pasture. Monthly all other times Milk Gamma Spectroscopy Bi-weekly grab sample TBE, TBE-2007 Gamma emitting radioisotope analysis when cows are on pasture. Monthly all other times Vegetation Gamma Spectroscopy Annual grab samples. TBE, TBE-2007 Gamma emitting radioisotope analysis OSLD Optically Stimulated Quarterly OSLDs Landauer Incorporated Luminescence comprised of two Dosimetry Al2O3:C Landauer Incorporated elements.

B-4 Page 46 of 206

Figure B-1 Inner and Outer Ring OSLD Locations of the Byron Nuclear Generating Station, 2014 B-5 Page 47 of 206

Figure B-2 Onsite Air Sampling Locations of the Byron Nuclear Generating Station, 2014 B-6 Page 48 of 206

Figure B-3 Offsite Air Sampling Locations of the Byron Nuclear Generating Station, 2014 B-7 Page 49 of 206

Figure B-4 Ingestion and Waterborne Exposure Pathway Sampling Locations of the Byron Nuclear Generating Station, 2014 B-8 Page 50 of 206

APPENDIX C DATA TABLES AND FIGURES PRIMARY LABORATORY Page 51 of 206

Table C-I.1 CONCENTRATIONS OF GROSS BETA IN SURFACE WATER SAMPLES COLLECTED IN THE VICINITY OF BYRON NUCLEAR GENERATING STATION, 2014 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION BY-12 BY-29 PERIOD 01/08/14 - 01/28/14 (1) (1) 02/04/14 - 02/24/14 (1) (1) 03/11/14 - 03/25/14 7.6 +/- 2.2 (1) 6.7 +/- 2.0 (1) 04/01/14 - 04/29/14 5.9 +/- 2.1 5.9 +/- 2.2 05/06/14 - 05/27/14 6.5 +/- 2.2 4.5 +/- 2.1 06/03/14 - 06/24/14 6.2 +/- 2.4 6.2 +/- 2.5 07/01/14 - 07/29/14 4.6 +/- 2.2 4.8 +/- 2.2 08/05/14 - 08/26/14 5.3 +/- 2.4 5.1 +/- 2.3 09/02/14 - 09/30/14 4.0 +/- 2.2 3.2 +/- 2.1 10/07/14 - 10/28/14 3.0 +/- 2.0 4.0 +/- 2.1 11/04/14 - 11/11/14 4.9 +/- 2.3 (1) 4.2 +/- 2.1 (1) 12/09/14 - 12/29/14 < 2.9 (1) < 2.9 (1)

MEAN 5.3 +/- 2.8 4.9 +/- 2.3 Table C-I.2 CONCENTRATIONS OF TRITIUM IN SURFACE WATER SAMPLES COLLECTED IN THE VICINITY OF BYRON NUCLEAR GENERATING STATION, 2014 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION BY-12 BY-29 PERIOD 03/11/14 - 03/25/14 < 172 (1) < 169 (1) 04/01/14 - 06/24/14 352 +/- 139 < 194 07/01/14 - 09/30/14 985 +/- 170 < 186 10/07/14 - 12/29/14 < 189 (1) < 188 (1)

MEAN 669 +/- 895 -

Table C-I.3 CONCENTRATIONS OF NI-63 IN SURFACE WATER SAMPLES COLLECTED IN THE VICINITY OF BYRON NUCLEAR GENERATING STATION, 2014 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION BY-12 BY-29 PERIOD 1/8/2014 - 01/28/14 (1) (1) 02/04/14 - 02/24/14 (1) (1) 03/11/14 - 03/25/14 < 18 (1) < 18 (1) 04/01/14 - 04/29/14 < 5 < 17 05/06/14 - 05/27/14 < 17 < 17 06/03/14 - 06/24/14 < 11 < 11 07/01/14 - 07/29/14 < 14 < 13 08/05/14 - 08/26/14 < 15 < 14 09/02/14 - 09/30/14 < 15 < 15 10/07/14 - 10/28/14 < 16 < 16 11/04/14 - 11/11/14 < 15 (1) < 13 (1) 12/09/14 - 12/29/14 < 17 (1) < 18 (1)

MEAN - -

THE MEAN AND TWO STANDARD DEVIATOIN ARE CALCULATED USING THE POSITIVE VALUES (1) SEE PROGRAM EXCEPTIONS SECTION FOR EXPLANATION Page 52 of 206 C-1

Table C-I.4 CONCENTRATIONS OF GAMMA EMITTERS IN SURFACE WATER SAMPLES COLLECTED IN THE VICINITY OF BYRON NUCLEAR GENERATING STATION, 2014 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA SITE COLLECTION Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 I-131 Cs-134 Cs-137 Ba-140 La-140 PERIOD BY-12 01/08/14 - 01/28/14 (1) - - - - - - - - - - - -

02/04/14 - 02/24/14 (1) - - - - - - - - - - - -

03/11/14 - 03/25/14 (1) < 4 < 5 < 12 < 5 < 11 < 6 < 10 < 15 < 5 < 5 < 34 < 10 04/01/14 - 04/29/14 < 1 < 2 < 4 < 1 < 3 < 2 < 3 < 10 < 1 < 1 < 16 < 6 05/06/14 - 05/27/14 < 1 < 1 < 3 < 1 < 3 < 1 < 2 < 6 < 1 < 1 < 11 < 4 06/03/14 - 06/24/14 < 1 < 2 < 4 < 1 < 3 < 2 < 3 < 7 < 2 < 2 < 14 < 4 07/01/14 - 07/29/14 < 2 < 2 < 4 < 2 < 3 < 2 < 3 < 12 < 2 < 2 < 19 < 6 08/05/14 - 08/26/14 < 2 < 2 < 5 < 2 < 4 < 2 < 4 < 15 < 2 < 2 < 24 < 7 09/02/14 - 09/30/14 < 1 < 1 < 3 < 1 < 2 < 2 < 3 < 8 < 1 < 1 < 13 < 4 10/07/14 - 10/28/14 < 3 < 3 < 7 < 3 < 6 < 3 < 5 < 13 < 3 < 3 < 25 < 7 11/04/14 - 11/11/14 (1) < 1 < 2 < 4 < 1 < 3 < 2 < 3 < 11 < 1 < 1 < 17 < 6 12/09/14 - 12/29/14 (1) < 2 < 2 < 4 < 2 < 4 < 2 < 4 < 10 < 2 < 2 < 18 < 5 MEAN - - - - - - - - - - - -

BY-29 01/08/14 - 01/28/14 (1) - - - - - - - - - - - -

C-2 02/04/14 - 02/24/14 (1) - - - - - - - - - - - -

03/18/14 - 03/25/14 (1) < 5 < 5 < 9 < 5 < 10 < 6 < 9 < 11 < 4 < 4 < 25 < 9 04/01/14 - 04/29/14 < 2 < 2 < 4 < 7 < 3 < 2 < 3 < 11 < 1 < 2 < 18 < 5 05/06/14 - 05/27/14 < 2 < 2 < 5 < 2 < 4 < 2 < 4 < 9 < 2 < 2 < 17 < 6 06/03/14 - 06/24/14 < 2 < 2 < 5 < 2 < 4 < 2 < 4 < 9 < 2 < 2 < 17 < 5 07/01/14 - 07/29/14 < 1 < 2 < 4 < 1 < 3 < 2 < 3 < 10 < 1 < 2 < 16 < 5 08/05/14 - 08/26/14 < 1 < 1 < 4 < 1 < 3 < 2 < 3 < 10 < 1 < 1 < 17 < 5 09/02/14 - 09/30/14 < 2 < 3 < 6 < 2 < 5 < 3 < 5 < 12 < 2 < 2 < 23 < 8 10/07/14 - 10/28/14 < 3 < 3 < 6 < 3 < 7 < 4 < 6 < 13 < 3 < 3 < 26 < 7 11/04/14 - 11/11/14 (1) < 2 < 2 < 4 < 2 < 3 < 2 < 3 < 12 < 1 < 2 < 18 < 6 12/09/14 - 12/29/14 (1) < 2 < 2 < 6 < 2 < 5 < 3 < 4 < 12 < 2 < 2 < 21 < 6 MEAN - - - - - - - - - - - -

Page 53 of 206 (1) SEE PROGRAM EXCEPTIONS SECTION FOR EXPLANATION

Table C-II.1 CONCENTRATIONS OF TRITIUM IN GROUND WATER SAMPLES COLLECTED IN THE VICINITY OF BYRON NUCLEAR GENERATING STATION, 2014 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION BY-14-1 BY-18-1 BY-32 BY-35 BY-36 BY-37 PERIOD 01/14/14 - 03/08/14 < 183 < 176 (1) < 176 (1) < 181 < 182 < 181 04/08/14 - 04/08/14 < 164 < 166 < 173 < 171 < 172 < 170 07/08/14 - 07/08/14 < 171 < 174 < 175 < 170 < 174 < 174 10/14/14 - 10/14/14 < 161 < 161 < 159 < 161 < 159 < 158 MEAN - - - - - -

(1) SEE PROGRAM EXCEPTIONS SECTION FOR EXPLANATION Page 54 of 206 C-3

Table C-II.2 CONCENTRATIONS OF GAMMA EMITTERS IN GROUND WATER SAMPLES COLLECTED IN THE VICINITY OF BYRON NUCLEAR GENERATING STATION, 2014 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA SITE COLLECTION Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 I-131 Cs-134 Cs-137 Ba-140 La-140 PERIOD BY-14-1 01/14/14 - 01/14/14 < 6 < 6 < 14 < 5 < 14 < 7 < 11 < 11 < 6 < 7 < 32 < 9 04/08/14 - 04/08/14 < 4 < 3 < 8 < 4 < 9 < 5 < 6 < 8 < 4 < 4 < 20 < 6 07/08/14 - 07/08/14 < 3 < 3 < 7 < 3 < 7 < 4 < 6 < 5 < 3 < 3 < 16 < 6 10/14/14 - 10/14/14 < 4 < 4 < 9 < 3 < 8 < 5 < 7 < 15 < 4 < 4 < 30 < 10 MEAN - - - - - - - - - - - -

BY-18-1 03/08/14 - 03/08/14 (1) < 3 < 3 < 7 < 3 < 5 < 3 < 6 < 6 < 3 < 3 < 16 < 6 04/08/14 - 04/08/14 < 5 < 6 < 10 < 8 < 13 < 6 < 11 < 11 < 5 < 5 < 31 < 8 07/08/14 - 07/08/14 < 4 < 5 < 11 < 6 < 9 < 5 < 8 < 9 < 5 < 5 < 22 < 7 10/14/14 - 10/14/14 < 4 < 4 < 10 < 4 < 8 < 4 < 8 < 12 < 3 < 4 < 27 < 8 MEAN - - - - - - - - - - - -

BY-32 03/04/14 - 03/04/14 (1) < 7 < 6 < 14 < 8 < 12 < 7 < 13 < 13 < 7 < 7 < 33 < 11 04/08/14 - 04/08/14 < 5 < 6 < 11 < 6 < 12 < 6 < 11 < 12 < 5 < 7 < 32 < 8 07/08/14 - 07/08/14 < 4 < 3 < 8 < 4 < 6 < 4 < 6 < 6 < 4 < 4 < 15 < 6 C-4 10/14/14 - 10/14/14 < 4 < 4 < 7 < 3 < 7 < 4 < 6 < 11 < 3 < 3 < 24 < 7 MEAN - - - - - - - - - - - -

BY-35 01/14/14 - 01/14/14 < 6 < 6 < 8 < 4 < 14 < 7 < 9 < 9 < 6 < 6 < 31 < 6 04/08/14 - 04/08/14 < 5 < 4 < 11 < 4 < 9 < 5 < 8 < 9 < 5 < 5 < 24 < 8 07/08/14 - 07/08/14 < 5 < 6 < 13 < 5 < 13 < 6 < 10 < 8 < 4 < 6 < 26 < 8 10/14/14 - 10/14/14 < 5 < 5 < 13 < 5 < 11 < 5 < 8 < 13 < 4 < 5 < 33 < 12 MEAN - - - - - - - - - - - -

BY-36 01/14/14 - 01/14/14 < 5 < 5 < 10 < 6 < 11 < 6 < 10 < 11 < 6 < 6 < 28 < 9 04/08/14 - 04/08/14 < 6 < 5 < 11 < 6 < 10 < 5 < 9 < 9 < 5 < 5 < 28 < 11 07/08/14 - 07/08/14 < 4 < 5 < 8 < 5 < 9 < 6 < 8 < 9 < 5 < 5 < 25 < 8 10/14/14 - 10/14/14 < 4 < 3 < 9 < 5 < 8 < 5 < 8 < 14 < 4 < 5 < 31 < 6 MEAN - - - - - - - - - - - -

BY-37 01/14/14 - 01/14/14 < 6 < 7 < 14 < 7 < 11 < 7 < 11 < 12 < 7 < 7 < 35 < 8 04/08/14 - 04/08/14 < 6 < 6 < 12 < 6 < 11 < 6 < 8 < 11 < 5 < 6 < 29 < 7 Page 55 of 206 07/08/14 - 07/08/14 < 4 < 4 < 9 < 4 < 8 < 5 < 7 < 7 < 3 < 4 < 21 < 6 10/14/14 - 10/14/14 < 5 < 5 < 12 < 5 < 8 < 5 < 10 < 15 < 4 < 5 < 26 < 9 MEAN - - - - - - - - - - - -

(1) SEE PROGRAM EXCEPTIONS SECTION FOR EXPLANATION

Table C-III.1 CONCENTRATIONS OF NICKEL-63 AND GAMMA EMITTERS IN FISH SAMPLES COLLECTED IN THE VICINITY OF BYRON NUCLEAR GENERATING STATION, 2014 RESULTS IN UNITS OF PCI/KG WET +/- 2 SIGMA SITE COLLECTION Ni-63 Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 Cs-134 Cs-137 Ba-140 La-140 PERIOD BY-29 Freshwater Drum 05/14/14 < 208 < 85 < 90 < 169 < 71 < 156 < 90 < 166 < 82 < 90 < 795 < 233 Shorthead Redhorse 05/14/14 < 189 < 67 < 79 < 180 < 75 < 146 < 99 < 182 < 79 < 79 < 736 < 231 Freshwater Drum 10/16/14 < 111 < 95 < 75 < 208 < 49 < 122 < 93 < 176 < 73 < 74 < 918 < 273 Shorthead Redhorse 10/16/14 < 107 < 41 < 46 < 101 < 43 < 102 < 48 < 92 < 39 < 42 < 463 < 160 MEAN - - - - - - - - - - - -

BY-31 Freshwater Drum 05/14/14 < 177 < 24 < 26 < 56 < 20 < 47 < 27 < 50 < 23 < 25 < 257 < 68 Channel Catfish 05/14/14 < 184 < 69 < 68 < 138 < 66 < 148 < 78 < 124 < 67 < 61 < 665 < 169 Smallmouth Bass 10/16/14 < 118 < 54 < 53 < 137 < 64 < 109 < 60 < 109 < 55 < 47 < 678 < 159 Common Carp 10/16/14 < 118 < 85 < 109 < 243 < 94 < 173 < 123 < 183 < 91 < 94 < 1296 < 324 C-5 MEAN - - - - - - - - - - - -

Page 56 of 206

Table C-IV.1 CONCENTRATIONS OF NICKEL-63 AND GAMMA EMITTERS IN SEDIMENT SAMPLES COLLECTED IN THE VICINITY OF BYRON NUCLEAR GENERATING STATION, 2014 RESULTS IN UNITS OF PCI/KG DRY +/- 2 SIGMA SITE COLLECTION Ni-63 Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 Cs-134 Cs-137 Ba-140 La-140 PERIOD BY-12 05/13/14 < 218 < 89 < 87 < 195 < 82 < 202 < 102 < 156 < 106 183 +/- 87 < 428 < 143 10/07/14 < 256 < 66 < 70 < 117 < 57 < 124 < 65 < 132 < 59 < 99 < 728 < 138 MEAN - - - - - - - - - - - -

BY-34 05/13/14 < 217 < 46 < 47 < 101 < 33 < 126 < 51 < 77 < 48 115 +/- 64 < 228 < 45 10/07/14 < 258 < 45 < 48 < 120 < 57 < 93 < 62 < 90 < 43 68 +/- 39 < 449 < 126 MEAN - - - - - - - - - 91 +/- 66 - -

C-6 Page 57 of 206

Table C-V.1 CONCENTRATIONS OF GROSS BETA IN AIR PARTICULATE SAMPLES COLLECTED IN THE VICINITY OF BYRON NUCLEAR GENERATING STATION, 2014 RESULTS IN UNITS OF E-3 PCI/CU METER +/- 2 SIGMA COLLECTION GROUP I GROUP II GROUP III PERIOD BY-21 BY-22 BY-23 BY-24 BY-01 BY-04 BY-06 BY-08 12/31/13 - 01/08/14 24 +/- 4 28 +/- 5 27 +/- 5 24 +/- 4 24 +/- 4 19 +/- 4 21 +/- 4 27 +/- 5 01/08/14 - 01/14/14 16 +/- 4 25 +/- 5 23 +/- 5 25 +/- 5 29 +/- 5 23 +/- 5 19 +/- 5 27 +/- 5 01/14/14 - 01/20/14 24 +/- 5 24 +/- 5 26 +/- 5 21 +/- 5 29 +/- 6 23 +/- 5 21 +/- 5 26 +/- 5 01/20/14 - 01/28/14 17 +/- 4 15 +/- 4 14 +/- 4 13 +/- 3 (1) 15 +/- 4 11 +/- 3 15 +/- 4 16 +/- 4 01/28/14 - 02/04/14 25 +/- 5 16 +/- 4 20 +/- 4 21 +/- 5 22 +/- 5 19 +/- 4 21 +/- 4 23 +/- 5 02/04/14 - 02/11/14 25 +/- 5 23 +/- 5 20 +/- 5 23 +/- 5 24 +/- 5 27 +/- 5 23 +/- 5 20 +/- 5 02/11/14 - 02/18/14 26 +/- 5 23 +/- 5 26 +/- 5 26 +/- 5 24 +/- 5 25 +/- 5 21 +/- 5 20 +/- 4 02/18/14 - 02/24/14 22 +/- 5 20 +/- 5 17 +/- 4 23 +/- 5 23 +/- 5 23 +/- 5 20 +/- 5 24 +/- 5 02/24/14 - 03/04/14 26 +/- 5 21 +/- 4 29 +/- 5 24 +/- 4 24 +/- 4 24 +/- 4 24 +/- 4 23 +/- 4 03/04/14 - 03/11/14 22 +/- 5 23 +/- 5 22 +/- 5 20 +/- 5 24 +/- 5 23 +/- 5 20 +/- 4 23 +/- 5 03/11/14 - 03/18/14 15 +/- 4 17 +/- 4 16 +/- 4 20 +/- 4 17 +/- 4 17 +/- 4 15 +/- 4 16 +/- 4 03/18/14 - 03/25/14 16 +/- 4 16 +/- 4 17 +/- 4 17 +/- 4 16 +/- 4 17 +/- 4 15 +/- 4 17 +/- 5 03/25/14 - 04/01/14 22 +/- 5 14 +/- 4 17 +/- 4 18 +/- 4 20 +/- 5 19 +/- 4 18 +/- 4 18 +/- 4 04/01/14 - 04/08/14 16 +/- 4 13 +/- 4 17 +/- 4 13 +/- 4 16 +/- 4 15 +/- 4 15 +/- 4 17 +/- 4 04/08/14 - 04/15/14 12 +/- 4 11 +/- 4 11 +/- 4 9 +/- 4 15 +/- 4 10 +/- 4 14 +/- 4 13 +/- 4 04/15/14 - 04/22/14 19 +/- 4 15 +/- 4 16 +/- 4 16 +/- 4 18 +/- 4 21 +/- 5 18 +/- 4 18 +/- 4 04/22/14 - 04/29/14 10 +/- 3 12 +/- 3 11 +/- 3 11 +/- 3 10 +/- 3 11 +/- 3 (1) 9 +/- 3 11 +/- 3 04/29/14 - 05/06/14 6 +/- 3 8 +/- 3 7 +/- 3 8 +/- 3 6 +/- 3 5 +/- 3 7 +/- 3 8 +/- 3 05/06/14 - 05/13/14 14 +/- 4 12 +/- 4 13 +/- 4 11 +/- 4 9 +/- 4 13 +/- 4 13 +/- 4 14 +/- 4 05/13/14 - 05/20/14 15 +/- 4 13 +/- 4 12 +/- 4 15 +/- 4 11 +/- 4 12 +/- 4 13 +/- 4 15 +/- 4 05/20/14 - 05/27/14 17 +/- 4 17 +/- 4 18 +/- 4 15 +/- 4 18 +/- 4 19 +/- 4 18 +/- 4 13 +/- 4 05/27/14 - 06/03/14 16 +/- 4 13 +/- 4 13 +/- 4 12 +/- 4 11 +/- 4 11 +/- 4 14 +/- 4 11 +/- 4 06/03/14 - 06/10/14 15 +/- 4 10 +/- 4 15 +/- 4 14 +/- 4 13 +/- 4 16 +/- 4 13 +/- 4 13 +/- 4 06/10/14 - 06/17/14 14 +/- 4 17 +/- 4 14 +/- 4 13 +/- 4 17 +/- 4 20 +/- 4 14 +/- 4 16 +/- 4 06/17/14 - 06/24/14 9 +/- 4 11 +/- 4 9 +/- 4 7 +/- 3 9 +/- 4 9 +/- 4 11 +/- 4 13 +/- 4 06/24/14 - 07/01/14 14 +/- 4 10 +/- 4 12 +/- 4 13 +/- 4 13 +/- 4 11 +/- 4 (1) 16 +/- 4 (1) 14 +/- 4 07/01/14 - 07/08/14 12 +/- 4 (1) 13 +/- 4 (1) 11 +/- 4 (1) 12 +/- 4 (1) 14 +/- 4 (1) 12 +/- 4 (1) 10 +/- 4 (1) 20 +/- 4 (1) 07/08/14 - 07/15/14 12 +/- 4 13 +/- 4 13 +/- 4 15 +/- 4 14 +/- 5 (1) 13 +/- 4 11 +/- 4 13 +/- 4 07/15/14 - 07/22/14 22 +/- 5 19 +/- 5 18 +/- 4 24 +/- 5 22 +/- 5 23 +/- 5 20 +/- 5 24 +/- 5 07/22/14 - 07/29/14 13 +/- 4 15 +/- 4 16 +/- 4 14 +/- 4 15 +/- 4 20 +/- 5 14 +/- 4 13 +/- 4 07/29/14 - 08/05/14 25 +/- 5 23 +/- 5 23 +/- 5 22 +/- 5 18 +/- 4 22 +/- 5 21 +/- 5 23 +/- 5 08/05/14 - 08/12/14 17 +/- 4 13 +/- 4 15 +/- 4 15 +/- 4 16 +/- 4 18 +/- 4 20 +/- 4 19 +/- 4 08/12/14 - 08/19/14 18 +/- 4 18 +/- 4 14 +/- 4 18 +/- 4 15 +/- 4 18 +/- 4 (1) 25 +/- 5 22 +/- 5 08/19/14 - 08/26/14 19 +/- 4 21 +/- 4 17 +/- 4 20 +/- 4 19 +/- 4 18 +/- 4 18 +/- 4 23 +/- 4 08/26/14 - 09/02/14 11 +/- 4 11 +/- 4 17 +/- 5 15 +/- 4 15 +/- 4 15 +/- 4 14 +/- 4 16 +/- 5 09/02/14 - 09/08/14 18 +/- 5 15 +/- 5 14 +/- 5 14 +/- 5 17 +/- 5 14 +/- 5 13 +/- 5 16 +/- 5 09/08/14 - 09/15/14 10 +/- 3 14 +/- 4 11 +/- 4 14 +/- 4 8 +/- 4 10 +/- 4 11 +/- 4 11 +/- 4 09/15/14 - 09/22/14 21 +/- 4 23 +/- 4 22 +/- 4 26 +/- 5 29 +/- 5 23 +/- 4 28 +/- 5 30 +/- 5 09/22/14 - 09/30/14 33 +/- 5 27 +/- 5 26 +/- 5 22 +/- 5 24 +/- 4 22 +/- 4 25 +/- 5 28 +/- 5 09/30/14 - 10/07/14 11 +/- 4 15 +/- 4 12 +/- 4 10 +/- 4 16 +/- 4 9 +/- 4 9 +/- 4 12 +/- 4 10/07/14 - 10/14/14 17 +/- 4 15 +/- 4 13 +/- 4 14 +/- 4 12 +/- 4 10 +/- 4 15 +/- 4 16 +/- 4 10/14/14 - 10/21/14 14 +/- 4 11 +/- 4 13 +/- 4 10 +/- 4 10 +/- 4 10 +/- 4 10 +/- 4 12 +/- 4 10/21/14 - 10/28/14 17 +/- 4 20 +/- 5 17 +/- 4 20 +/- 5 16 +/- 4 17 +/- 4 23 +/- 5 19 +/- 4 10/28/14 - 11/04/14 16 +/- 4 13 +/- 4 11 +/- 4 13 +/- 4 11 +/- 4 (1) 13 +/- 4 16 +/- 4 14 +/- 4 11/04/14 - 11/11/14 17 +/- 4 18 +/- 4 15 +/- 4 16 +/- 4 14 +/- 4 12 +/- 4 15 +/- 4 20 +/- 4 11/11/14 - 11/18/14 16 +/- 4 19 +/- 4 19 +/- 4 20 +/- 4 16 +/- 4 16 +/- 4 13 +/- 4 16 +/- 4 11/18/14 - 11/24/14 17 +/- 5 16 +/- 5 19 +/- 5 19 +/- 5 17 +/- 5 20 +/- 5 20 +/- 5 20 +/- 5 11/24/14 - 12/02/14 22 +/- 4 19 +/- 4 22 +/- 4 (1) 20 +/- 4 21 +/- 4 21 +/- 4 22 +/- 4 21 +/- 4 12/02/14 - 12/09/14 33 +/- 5 37 +/- 6 34 +/- 5 35 +/- 5 35 +/- 5 30 +/- 5 37 +/- 6 37 +/- 5 12/09/14 - 12/16/14 21 +/- 5 20 +/- 5 16 +/- 5 21 +/- 5 23 +/- 5 21 +/- 5 20 +/- 5 22 +/- 5 12/16/14 - 12/22/14 21 +/- 5 22 +/- 5 (1) 22 +/- 5 19 +/- 5 20 +/- 5 14 +/- 4 20 +/- 5 22 +/- 5 12/22/14 - 12/29/14 21 +/- 5 26 +/- 5 18 +/- 4 22 +/- 5 24 +/- 5 21 +/- 5 20 +/- 5 23 +/- 5 MEAN 18 +/- 11 17 +/- 11 17 +/- 11 17 +/- 11 18 +/- 12 17 +/- 11 17 +/- 11 19 +/- 11 (1) SEE PROGRAM EXCEPTIONS SECTION FOR EXPLANATION Page 58 of 206 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, 2014 RESULTS IN UNITS OF E-3 PCI/CU METER +/- 2 SIGMA GROUP I - 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 2SD PERIOD 2SD 12/31/13 - 02/04/14 13 28 21 +/- 9 12/31/13 - 02/04/14 11 29 21 +/- 10 12/31/13 - 02/04/14 16 27 24 +/- 10 02/04/14 - 03/04/14 17 29 23 +/- 6 02/04/14 - 03/04/14 20 27 24 +/- 4 02/04/14 - 03/04/14 20 24 22 +/- 4 03/04/14 - 04/01/14 14 23 18 +/- 6 03/04/14 - 04/01/14 15 24 18 +/- 6 03/04/14 - 04/01/14 16 23 19 +/- 6 04/01/14 - 04/29/14 9 19 13 +/- 6 04/01/14 - 04/29/14 9 21 14 +/- 8 04/01/14 - 04/29/14 11 18 15 +/- 7 04/29/14 - 06/03/14 6 18 13 +/- 7 04/29/14 - 06/03/14 5 19 12 +/- 8 04/29/14 - 06/03/14 8 15 12 +/- 6 06/03/14 - 07/01/14 7 17 12 +/- 5 06/03/14 - 07/01/14 9 20 13 +/- 7 06/03/14 - 07/01/14 13 16 14 +/- 2 07/01/14 - 07/29/14 11 24 15 +/- 8 07/01/14 - 07/29/14 10 23 16 +/- 8 07/01/14 - 07/29/14 13 24 17 +/- 11 07/29/14 - 09/02/14 11 25 18 +/- 8 07/29/14 - 09/02/14 14 25 18 +/- 6 07/29/14 - 09/02/14 16 23 20 +/- 6 09/02/14 - 09/30/14 10 33 19 +/- 13 09/02/14 - 09/30/14 8 29 19 +/- 15 09/02/14 - 09/30/14 11 30 21 +/- 18 09/30/14 - 11/04/14 10 20 14 +/- 6 09/30/14 - 11/04/14 9 23 13 +/- 8 09/30/14 - 11/04/14 12 19 14 +/- 6 11/04/14 - 12/02/14 15 22 18 +/- 4 11/04/14 - 12/02/14 12 22 17 +/- 7 11/04/14 - 12/02/14 16 21 19 +/- 5 12/02/14 - 12/29/14 16 37 24 +/- 13 12/02/14 - 12/29/14 14 37 24 +/- 14 12/02/14 - 12/29/14 22 37 26 +/- 15 C-8 12/31/13 - 12/29/14 6 37 17 +/- 11 12/31/13 - 12/29/14 5 37 17 +/- 11 12/31/13 - 12/29/14 8 37 19 +/- 11 Page 59 of 206

Table C-V.3 CONCENTRATIONS OF GAMMA EMITTERS IN AIR PARTICULATE SAMPLES COLLECTED IN THE VICINITY OF BYRON NUCLEAR GENERATING STATION, 2014 RESULTS IN UNITS OF E-3 PCI/CU METER +/- 2 SIGMA SITE COLLECTION Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 Cs-134 Cs-137 Ba-140 La-140 PERIOD BY-01 12/31/13 - 04/01/14 < 3 < 7 < 18 < 3 < 10 < 7 < 10 < 4 < 3 < 585 < 181 04/01/14 - 07/01/14 < 4 < 7 < 21 < 3 < 11 < 8 < 13 < 4 < 4 < 689 < 170 07/01/14 - 09/30/14 < 3 < 4 < 15 < 2 < 6 < 5 < 8 < 2 < 2 < 732 < 364 09/30/14 - 12/29/14 < 4 < 7 < 25 < 4 < 9 < 8 < 17 < 3 < 4 < 914 < 382 MEAN - - - - - - - - - - -

BY-04 12/31/13 - 04/01/14 < 2 < 4 < 11 < 2 < 5 < 4 < 6 < 2 < 1 < 337 < 116 04/01/14 - 07/01/14 < 2 < 6 < 15 < 2 < 6 < 7 < 11 < 3 < 3 < 596 < 160 07/01/14 - 09/30/14 < 3 < 6 < 20 < 3 < 6 < 6 < 13 < 3 < 3 < 840 < 351 09/30/14 - 12/29/14 < 3 < 4 < 17 < 4 < 7 < 5 < 7 < 3 < 3 < 516 < 323 MEAN - - - - - - - - - - -

BY-06 12/31/13 - 04/01/14 < 3 < 4 < 16 < 3 < 5 < 4 < 9 < 3 < 2 < 428 < 174 04/01/14 - 07/01/14 < 2 < 3 < 12 < 2 < 6 < 4 < 6 < 2 < 2 < 303 < 110 C-9 07/01/14 - 09/30/14 < 3 < 7 < 14 < 3 < 8 < 6 < 12 < 2 < 3 < 1009 < 379 09/30/14 - 12/29/14 < 4 < 7 < 22 < 4 < 11 < 8 < 13 < 3 < 3 < 822 < 329 MEAN - - - - - - - - - - -

BY-08 12/31/13 - 04/01/14 < 3 < 4 < 15 < 3 < 7 < 4 < 8 < 3 < 2 < 326 < 117 04/01/14 - 07/01/14 < 2 < 4 < 10 < 1 < 5 < 4 < 6 < 1 < 2 < 294 < 110 07/01/14 - 09/30/14 < 2 < 4 < 13 < 1 < 6 < 4 < 7 < 2 < 2 < 705 < 326 09/30/14 - 12/29/14 < 2 < 3 < 16 < 2 < 4 < 5 < 7 < 2 < 2 < 506 < 228 MEAN - - - - - - - - - - -

BY-21 12/31/13 - 04/01/14 < 4 < 8 < 21 < 4 < 11 < 7 < 16 < 4 < 3 < 489 < 277 04/01/14 - 07/01/14 < 3 < 4 < 16 < 3 < 6 < 5 < 10 < 3 < 2 < 307 < 149 07/01/14 - 09/30/14 < 3 < 5 < 16 < 3 < 7 < 5 < 5 < 2 < 3 < 921 < 393 09/30/14 - 12/29/14 < 2 < 4 < 12 < 3 < 2 < 3 < 6 < 1 < 2 < 405 < 127 MEAN - - - - - - - - - - -

Page 60 of 206

Table C-V.3 CONCENTRATIONS OF GAMMA EMITTERS IN AIR PARTICULATE SAMPLES COLLECTED IN THE VICINITY OF BYRON NUCLEAR GENERATING STATION, 2014 RESULTS IN UNITS OF E-3 PCI/CU METER +/- 2 SIGMA SITE COLLECTION Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 Cs-134 Cs-137 Ba-140 La-140 PERIOD BY-22 12/31/13 - 04/01/14 < 3 < 4 < 19 < 3 < 8 < 6 < 10 < 3 < 3 < 438 < 246 04/01/14 - 07/01/14 < 3 < 5 < 15 < 3 < 8 < 4 < 7 < 3 < 2 < 372 < 188 07/01/14 - 09/30/14 < 3 < 4 < 16 < 2 < 6 < 5 < 9 < 2 < 2 < 874 < 322 09/30/14 - 12/29/14 < 3 < 5 < 18 < 3 < 8 < 5 < 9 < 3 < 2 < 728 < 242 MEAN - - - - - - - - - - -

BY-23 12/31/13 - 04/01/14 < 4 < 7 < 20 < 4 < 10 < 7 < 11 < 4 < 4 < 513 < 222 04/01/14 - 07/01/14 < 3 < 5 < 12 < 2 < 7 < 4 < 6 < 3 < 2 < 416 < 148 07/01/14 - 09/30/14 < 4 < 6 < 22 < 2 < 7 < 7 < 12 < 3 < 3 < 1439 < 544 09/30/14 - 12/29/14 < 3 < 4 < 16 < 2 < 7 < 5 < 10 < 3 < 2 < 740 < 114 MEAN - - - - - - - - - - -

BY-24 12/31/13 - 04/01/14 < 4 < 7 < 21 < 3 < 8 < 7 < 13 < 4 < 4 < 520 < 215 C-10 04/01/14 - 07/01/14 < 3 < 4 < 9 < 2 < 6 < 5 < 8 < 3 < 2 < 397 < 132 07/01/14 - 09/30/14 < 4 < 7 < 28 < 3 < 9 < 8 < 17 < 4 < 3 < 1547 < 616 09/30/14 - 12/29/14 < 4 < 8 < 20 < 5 < 10 < 8 < 14 < 4 < 3 < 930 < 368 MEAN - - - - - - - - - - -

Page 61 of 206

Table C-VI.1 CONCENTRATIONS OF I-131 IN AIR IODINE SAMPLES COLLECTED IN THE VICINITY OF BYRON NUCLEAR GENERATING STATION, 2014 RESULTS IN UNITS OF E-3 PCI/CU METER +/- 2 SIGMA COLLECTION GROUP I GROUP II GROUP III PERIOD BY-21 BY-22 BY-23 BY-24 BY-01 BY-04 BY-06 BY-08 12/31/13 - 01/08/14 < 68 < 68 < 67 < 67 < 64 < 63 < 63 < 62 01/08/14 - 01/14/14 < 70 < 69 < 69 < 69 < 55 < 55 < 53 < 54 01/14/14 - 01/20/14 < 68 < 68 < 24 < 69 < 43 < 42 < 42 < 67 01/20/14 - 01/28/14 < 21 < 21 < 21 < 18 (1) < 19 < 19 < 19 < 20 01/28/14 - 02/04/14 < 33 < 33 < 33 < 23 < 51 < 50 < 49 < 50 02/04/14 - 02/11/14 < 59 < 59 < 59 < 60 < 69 < 65 < 65 < 69 02/11/14 - 02/18/14 < 55 < 60 < 60 < 60 < 23 < 54 < 54 < 54 02/18/14 - 02/24/14 < 56 < 56 < 56 < 56 < 69 < 69 < 69 < 67 02/24/14 - 03/04/14 < 29 < 32 < 32 < 32 < 29 < 12 < 29 < 30 03/04/14 - 03/11/14 < 60 < 60 < 61 < 61 < 64 < 65 < 65 < 62 03/11/14 - 03/18/14 < 55 < 51 < 51 < 51 < 56 < 55 < 23 < 54 03/18/14 - 03/25/14 < 52 < 52 < 51 < 51 < 54 < 55 < 56 < 57 03/25/14 - 04/01/14 < 28 < 66 < 66 < 66 < 51 < 52 < 52 < 67 04/01/14 - 04/08/14 < 60 < 60 < 59 < 59 < 46 < 46 < 46 < 45 04/08/14 - 04/15/14 < 23 < 68 < 70 < 70 < 56 < 56 < 56 < 54 04/15/14 - 04/22/14 < 54 < 54 < 55 < 55 < 70 < 67 < 67 < 69 04/22/14 - 04/29/14 < 70 < 29 < 69 < 69 < 56 < 57 (1) < 57 < 59 04/29/14 - 05/06/14 < 64 < 63 < 63 < 63 < 53 < 53 < 53 < 54 05/06/14 - 05/13/14 < 55 < 55 < 56 < 56 < 47 < 47 < 47 < 47 05/13/14 - 05/20/14 < 66 < 66 < 65 < 65 < 62 < 63 < 63 < 63 05/20/14 - 05/27/14 < 52 < 51 < 51 < 22 < 55 < 55 < 55 < 53 05/27/14 - 06/03/14 < 67 < 67 < 67 < 67 < 55 < 56 < 56 < 58 06/03/14 - 06/10/14 < 19 < 18 < 19 < 19 < 31 < 50 < 51 < 49 06/10/14 - 06/17/14 < 59 < 59 < 58 < 58 < 57 < 59 < 59 < 60 06/17/14 - 06/24/14 < 57 < 65 < 65 < 65 < 55 < 24 < 55 < 55 06/24/14 - 07/01/14 < 64 < 63 < 63 < 63 < 60 < 61 (1) < 67 (1) < 62 07/01/14 - 07/08/14 < 46 (1) < 35 (1) < 35 (1) < 35 (1) < 48 (1) < 46 (1) < 19 (1) < 46 (1) 07/08/14 - 07/15/14 < 35 < 35 < 35 < 35 < 44 (1) < 36 < 36 < 36 07/15/14 - 07/22/14 < 40 < 40 < 40 < 40 < 40 < 40 < 39 < 16 07/22/14 - 07/29/14 < 61 < 61 < 60 < 60 < 60 < 60 < 61 < 62 07/29/14 - 08/05/14 < 22 < 51 < 51 < 51 < 53 < 54 < 54 < 54 08/05/14 - 08/12/14 < 26 < 26 < 26 < 26 < 22 < 23 < 23 < 23 08/12/14 - 08/19/14 < 62 < 24 < 62 < 62 < 63 < 63 (1) < 64 < 64 08/19/14 - 08/26/14 < 52 < 52 < 52 < 52 < 68 < 69 < 69 < 67 08/26/14 - 09/02/14 < 68 < 68 < 28 < 68 < 68 < 69 < 69 < 67 09/02/14 - 09/08/14 < 60 < 60 < 60 < 60 < 60 < 60 < 61 < 63 09/08/14 - 09/15/14 < 34 < 34 < 33 < 14 < 43 < 43 < 43 < 42 09/15/14 - 09/22/14 < 69 < 69 < 69 < 69 < 61 < 60 < 60 < 59 09/22/14 - 09/30/14 < 57 < 70 < 69 < 69 < 20 < 52 < 54 < 55 09/30/14 - 10/07/14 < 42 < 42 < 42 < 42 < 39 < 39 < 39 < 39 10/07/14 - 10/14/14 < 22 < 23 < 23 < 23 < 23 < 9 < 22 < 22 10/14/14 - 10/21/14 < 30 < 30 < 30 < 30 < 25 < 25 < 25 < 25 10/21/14 - 10/28/14 < 61 < 54 < 54 < 54 < 62 < 64 < 24 < 61 10/28/14 - 11/04/14 < 67 < 67 < 67 < 66 < 57 (1) < 57 < 58 < 59 11/04/14 - 11/11/14 < 32 < 33 < 33 < 33 < 33 < 32 < 32 < 12 11/11/14 - 11/18/14 < 64 < 64 < 63 < 64 < 55 < 55 < 54 < 54 11/18/14 - 11/24/14 < 19 < 45 < 45 < 45 < 47 < 49 < 49 < 50 11/24/14 - 12/02/14 < 25 < 25 < 25 (1) < 25 < 26 < 26 < 27 < 27 12/02/14 - 12/09/14 < 56 < 29 < 56 < 56 < 49 < 50 < 49 < 48 12/09/14 - 12/16/14 < 62 < 62 < 62 < 61 < 60 < 60 < 60 < 60 12/16/14 - 12/22/14 < 38 < 38 (1) < 21 < 38 < 44 < 44 < 44 < 45 12/22/14 - 12/29/14 < 41 < 41 < 41 < 42 < 64 < 65 < 65 < 65 MEAN - - - - - - - -

(1) SEE PROGRAM EXCEPTIONS SECTION FOR EXPLANATION Page 62 of 206 C-11

Table C-VII.1 CONCENTRATIONS OF I-131 IN MILK SAMPLES COLLECTED IN THE VICINITY OF BYRON NUCLEAR GENERATING STATION, 2014 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA CONTROL FARM INDICATOR FARM COLLECTION BY-26-2 BY-20-1 PERIOD 01/07/14 < 0.7 < 0.7 02/04/14 < 0.8 < 0.7 03/04/14 < 0.8 < 0.8 04/01/14 < 0.8 < 0.7 05/06/14 < 0.7 < 0.9 05/20/14 < 0.8 < 0.7 06/03/14 < 0.8 < 0.8 06/17/14 < 0.5 < 0.5 07/01/14 < 0.6 < 0.7 07/15/14 < 0.6 < 0.7 07/29/14 < 0.5 < 0.5 08/12/14 < 0.6 < 0.5 08/26/14 < 0.8 < 0.7 09/08/14 < 0.7 < 0.7 09/22/14 < 0.5 < 0.7 10/07/14 < 0.7 < 0.8 10/21/14 < 0.8 < 0.7 11/04/14 < 0.7 < 0.4 12/02/14 < 0.3 < 0.4 MEAN - -

Page 63 of 206 C-12

Table C-VII.2 CONCENTRATIONS OF GAMMA EMITTERS IN MILK SAMPLES COLLECTED IN THE VICINITY OF BYRON NUCLEAR GENERATING STATION, 2014 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA SITE COLLECTION Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 Cs-134 Cs-137 Ba-140 La-140 PERIOD BY-20-1 01/07/14 < 6 < 7 < 13 < 10 < 14 < 8 < 13 < 7 < 8 < 43 < 12 02/04/14 < 5 < 5 < 14 < 9 < 14 < 5 < 11 < 5 < 6 < 37 < 10 03/04/14 < 7 < 8 < 16 < 12 < 17 < 9 < 14 < 9 < 11 < 48 < 15 04/01/14 < 5 < 5 < 12 < 5 < 11 < 5 < 10 < 5 < 5 < 30 < 8 05/06/14 < 8 < 9 < 21 < 11 < 21 < 8 < 14 < 7 < 9 < 47 < 12 05/20/14 < 5 < 5 < 9 < 6 < 11 < 5 < 9 < 4 < 5 < 22 < 7 06/03/14 < 7 < 5 < 15 < 7 < 16 < 7 < 9 < 5 < 7 < 36 < 7 06/17/14 < 7 < 5 < 17 < 7 < 18 < 8 < 12 < 7 < 7 < 35 < 11 07/01/14 < 7 < 6 < 14 < 6 < 16 < 7 < 12 < 6 < 7 < 28 < 7 07/15/14 < 6 < 7 < 14 < 9 < 12 < 7 < 13 < 6 < 8 < 36 < 11 07/29/14 < 8 < 9 < 24 < 9 < 22 < 9 < 16 < 8 < 8 < 43 < 10 08/12/14 < 5 < 5 < 13 < 5 < 12 < 5 < 11 < 5 < 5 < 30 < 7 08/26/14 < 6 < 6 < 15 < 6 < 15 < 6 < 11 < 5 < 7 < 28 < 11 09/08/14 < 6 < 8 < 15 < 11 < 18 < 9 < 13 < 7 < 8 < 42 < 14 09/22/14 < 5 < 6 < 11 < 7 < 12 < 6 < 10 < 5 < 5 < 48 < 12 10/07/14 < 7 < 7 < 14 < 8 < 16 < 6 < 10 < 7 < 6 < 31 < 9 C-13 10/21/14 < 6 < 6 < 13 < 7 < 13 < 6 < 10 < 5 < 5 < 44 < 15 11/04/14 < 7 < 7 < 12 < 6 < 14 < 6 < 12 < 5 < 6 < 30 < 9 12/02/14 < 5 < 5 < 11 < 4 < 9 < 5 < 9 < 4 < 5 < 33 < 7 MEAN - - - - - - - - - - -

BY-26-2 01/07/14 < 9 < 8 < 22 < 11 < 20 < 8 < 15 < 7 < 10 < 45 < 13 02/04/14 < 6 < 7 < 16 < 7 < 14 < 7 < 11 < 5 < 6 < 41 < 15 03/04/14 < 8 < 9 < 19 < 10 < 19 < 9 < 13 < 7 < 9 < 40 < 11 04/01/14 < 5 < 6 < 12 < 5 < 11 < 6 < 9 < 5 < 6 < 26 < 7 05/06/14 < 10 < 9 < 23 < 9 < 23 < 11 < 20 < 9 < 10 < 48 < 10 05/20/14 < 5 < 5 < 12 < 6 < 13 < 5 < 10 < 5 < 5 < 25 < 5 06/03/14 < 7 < 7 < 15 < 9 < 15 < 8 < 13 < 8 < 8 < 40 < 11 06/17/14 < 8 < 6 < 16 < 9 < 18 < 8 < 15 < 7 < 8 < 44 < 11 07/01/14 < 7 < 9 < 14 < 6 < 15 < 7 < 13 < 6 < 7 < 32 < 7 07/15/14 < 6 < 6 < 13 < 7 < 16 < 6 < 10 < 5 < 7 < 33 < 9 07/29/14 < 8 < 8 < 16 < 9 < 16 < 7 < 12 < 7 < 8 < 36 < 11 08/12/14 < 6 < 6 < 14 < 6 < 14 < 6 < 12 < 6 < 7 < 31 < 8 08/26/14 < 7 < 6 < 16 < 8 < 17 < 7 < 13 < 6 < 7 < 39 < 14 09/08/14 < 7 < 7 < 13 < 6 < 15 < 7 < 11 < 5 < 7 < 34 < 13 Page 64 of 206 09/22/14 < 5 < 7 < 19 < 6 < 12 < 6 < 11 < 6 < 6 < 55 < 15 10/07/14 < 6 < 6 < 16 < 8 < 17 < 7 < 13 < 6 < 6 < 31 < 13 10/21/14 < 6 < 7 < 15 < 6 < 15 < 7 < 11 < 5 < 6 < 48 < 13 11/04/14 < 3 < 4 < 10 < 4 < 10 < 5 < 7 < 4 < 4 < 19 < 5 12/02/14 < 4 < 4 < 12 < 4 < 9 < 6 < 9 < 4 < 4 < 32 < 9 MEAN - - - - - - - - - - -

Table C-VIII.1 CONCENTRATIONS OF GAMMA EMITTERS IN VEGETATION SAMPLES COLLECTED IN THE VICINITY OF BYRON NUCLEAR GENERATING STATION, 2014 RESULTS IN UNITS OF PCI/KG WET +/- 2 SIGMA SITE COLLECTION Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 I-131 Cs-134 Cs-137 Ba-140 La-140 PERIOD BY-CONTROL Kohlrabi 08/05/14 < 23 < 22 < 54 < 25 < 54 < 27 < 46 < 49 < 22 < 28 < 120 < 48 Lettuce 08/05/14 < 29 < 27 < 53 < 30 < 71 < 30 < 48 < 56 < 23 < 36 < 147 < 48 MEAN - - - - - - - - - - - -

BY-QUAD 1 Cabbage 08/05/14 < 11 < 10 < 28 < 9 < 23 < 11 < 19 < 24 < 10 < 9 < 49 < 20 Potatoes 08/05/14 < 23 < 20 < 50 < 26 < 56 < 26 < 45 < 45 < 21 < 24 < 147 < 38 MEAN - - - - - - - - - - - -

BY-QUAD 2 Cabbage 08/05/14 < 18 < 14 < 35 < 19 < 39 < 17 < 30 < 44 < 18 < 19 < 101 < 24 Onions 08/05/14 < 13 < 16 < 29 < 11 < 34 < 15 < 26 < 32 < 13 < 15 < 89 < 25 MEAN - - - - - - - - - - - -

BY-QUAD 3 C-14 Cabbage 08/05/14 < 15 < 14 < 34 < 16 < 37 < 17 < 28 < 34 < 14 < 15 < 88 < 29 Rutabagas 08/05/14 < 23 < 18 < 59 < 18 < 57 < 21 < 39 < 51 < 20 < 23 < 124 < 34 MEAN - - - - - - - - - - - -

BY-QUAD 4 Cabbage 08/05/14 < 20 < 22 < 41 < 20 < 34 < 21 < 37 < 47 < 21 < 22 < 117 < 24 Onions/beets (comp.) 08/05/14 < 15 < 17 < 37 < 19 < 46 < 18 < 33 < 34 < 16 < 19 < 90 < 27 MEAN - - - - - - - - - - - -

Page 65 of 206

Table C-IX.1 QUARTERLY OSLD RESULTS FOR BYRON NUCLEAR GENERATING STATION, 2014 RESULTS IN UNITS OF MREM/QUARTER +/- 2 STANDARD DEVIATIONS STATION MEAN JAN - MAR APR - JUN JUL - SEP OCT - DEC CODE +/- 2 S.D.

BY-01-1 21 +/- 3 19 21 21 22 (1)

BY-01-2 20 +/- 3 19 22 21 20 (1)

BY-04-1 23 +/- 7 19 22 24 27 (1)

BY-04-2 23 +/- 6 19 23 25 26 (1)

BY-06-1 20 +/- 3 18 20 21 22 (1)

BY-06-2 20 +/- 2 19 20 21 22 (1)

BY-08-1 20 +/- 3 18 20 21 21 (1)

BY-08-2 19 +/- 2 18 19 21 18 (1)

BY-21-1 19 +/- 2 18 20 19 18 (1)

BY-21-2 19 +/- 1 18 19 19 18 (1)

BY-22-1 25 +/- 1 26 (1) 25 25 26 (1)

BY-22-2 24 +/- 3 22 23 25 25 (1)

BY-23-1 23 +/- 3 21 23 23 24 (1)

BY-23-2 22 +/- 5 18 23 23 24 (1)

BY-24-1 21 +/- 3 21 21 23 20 (1)

BY-24-2 22 +/- 4 19 22 22 25 (1)

BY-101-1 18 +/- 2 17 19 18 19 (1)

BY-101-2 19 +/- 2 18 19 20 19 (1)

BY-102-1 24 +/- 5 21 26 27 24 (1)

BY-102-2 24 +/- 4 21 25 25 25 (1)

BY-103-1 23 +/- 5 20 22 25 24 (1)

BY-103-2 24 +/- 3 22 25 24 25 (1)

BY-103-3 24 +/- 3 22 24 24 25 (1)

BY-104-1 24 +/- 5 21 24 26 27 (1)

BY-104-2 25 +/- 7 21 25 26 29 (1)

BY-104-3 23 +/- 3 20 22 23 24 (1)

BY-105-1 24 +/- 6 20 25 26 26 (1)

BY-105-2 25 +/- 4 22 25 25 27 (1)

BY-106-1 23 +/- 6 19 26 24 24 (1)

BY-106-2 23 +/- 7 19 23 26 27 (1)

BY-107-1 25 +/- 6 21 27 27 27 (1)

BY-107-2 25 +/- 8 20 25 27 29 (1)

BY-107-3 22 +/- 5 20 21 23 25 (1)

BY-108-1 24 +/- 8 19 24 26 28 (1)

BY-108-2 22 +/- 6 18 22 23 24 (1)

BY-109-1 23 +/- 5 20 25 24 25 (1)

BY-109-2 22 +/- 4 20 22 24 23 (1)

BY-110-1 22 +/- 6 19 21 23 25 (1)

BY-110-2 23 +/- 5 19 23 25 24 (1)

BY-111-3 24 +/- 6 20 24 26 27 (1)

BY-111-4 22 +/- 7 18 23 22 26 (1)

BY-112-3 23 +/- 7 18 25 24 26 (1)

BY-112-4 23 +/- 5 21 21 24 26 (1)

BY-113-1 23 +/- 5 19 24 24 25 (1)

BY-113-2 21 +/- 5 18 21 23 23 (1)

BY-114-1 20 +/- 4 17 21 21 21 (1)

BY-114-2 23 +/- 4 20 23 25 24 (1)

(1) SEE PROGRAM EXCEPTIONS SECTION FOR EXPLANATION Page 66 of 206 C-15

Table C-IX.1 QUARTERLY OSLD RESULTS FOR BYRON NUCLEAR GENERATING STATION, 2014 RESULTS IN UNITS OF MREM/QUARTER +/- 2 STANDARD DEVIATIONS STATION MEAN JAN - MAR APR - JUN JUL - SEP OCT - DEC CODE +/- 2 S.D.

BY-115-1 23 +/- 6 19 23 25 26 (1)

BY-115-2 22 +/- 3 20 22 23 23 (1)

BY-116-1 21 +/- 3 19 21 22 22 (1)

BY-116-2 22 +/- 6 17 22 23 25 (1)

BY-116-3 22 +/- 3 20 22 24 22 (1)

BY-201-3 24 +/- 4 21 24 25 25 (1)

BY-201-4 24 +/- 5 21 25 26 24 (1)

BY-202-1 23 +/- 5 19 24 25 25 (1)

BY-202-2 26 +/- 6 22 28 27 28 (1)

BY-203-1 19 +/- 3 18 19 20 21 (1)

BY-203-2 21 +/- 2 20 22 21 22 (1)

BY-204-1 21 +/- 5 18 22 23 20 (1)

BY-204-2 24 +/- 5 20 25 26 25 (1)

BY-205-1 25 +/- 6 20 26 27 26 (1)

BY-205-2 23 +/- 4 21 23 25 22 (1)

BY-206-1 24 +/- 4 21 25 25 25 (1)

BY-206-2 25 +/- 5 22 24 26 28 (1)

BY-207-1 24 +/- 7 19 24 26 28 (1)

BY-207-2 22 +/- 6 18 23 24 25 (1)

BY-208-1 24 +/- 8 18 26 26 26 (1)

BY-208-2 23 +/- 8 18 25 27 24 (1)

BY-209-1 25 +/- 6 21 25 27 27 (1)

BY-209-4 24 +/- 6 20 24 28 26 (1)

BY-210-3 23 +/- 7 18 24 25 24 (1)

BY-210-4 24 +/- 5 21 24 25 27 (1)

BY-211-1 25 +/- 4 22 24 27 26 (1)

BY-211-4 24 +/- 6 19 25 26 26 (1)

BY-212-1 26 +/- 6 21 26 28 27 (1)

BY-212-4 26 +/- 6 22 26 29 28 (1)

BY-213-1 25 +/- 7 20 26 26 28 (1)

BY-213-4 24 +/- 6 20 26 22 27 (1)

BY-214-1 23 +/- 5 20 25 25 25 (1)

BY-214-4 24 +/- 6 20 25 28 24 (1)

BY-215-1 24 +/- 7 19 24 26 27 (1)

BY-215-4 25 +/- 7 20 25 25 28 (1)

BY-216-1 26 +/- 5 23 26 28 28 (1)

BY-216-2 24 +/- 6 20 27 24 24 (1)

BY-301-1 19 +/- 1 18 20 19 18 (1)

BY-302-1 24 +/- 3 22 23 26 25 (1)

BY-309-1 22 +/- 4 19 21 24 22 (1)

BY-309-2 24 +/- 7 19 25 28 25 (1)

BY-309-3 22 +/- 6 18 21 24 25 (1)

BY-309-4 20 +/- 3 18 21 21 (1)

BY-314-1 19 +/- 4 18 17 21 21 (1)

(1) SEE PROGRAM EXCEPTIONS SECTION FOR EXPLANATION Page 67 of 206 C-16

TABLE C-IX.2 MEAN QUARTLY OSLD RESULTS FOR THE INNER RING, OUTER RING, SPECIAL INTEREST, OTHER AND CONTROL LOCATIONS FOR BYRON NUCLEAR GENERATING STATION, 2014 RESULTS IN UNITS OF MREM/QUARTER +/- 2 STANDARD DEVIATION OF THE STATION DATA COLLECTION INNER RING OUTER RING SPECIAL INTEREST OTHER CONTROL PERIOD +/- 2 S.D.

JAN-MAR 20 +/- 3 20 +/- 3 19 +/- 3 20 +/- 4 18 +/- 1 APR-JUN 23 +/- 4 25 +/- 3 21 +/- 5 22 +/- 3 20 +/- 2 JUL-SEP 24 +/- 4 25 +/- 4 23 +/- 6 22 +/- 4 21 +/- 0 OCT-DEC 25 +/- 5 25 +/- 4 23 +/- 6 23 +/- 6 20 +/- 4 TABLE C-IX.3

SUMMARY

OF THE AMBIENT DOSIMETRY PROGRAM FOR BYRON NUCLEAR GENERATING STATION, 2014 RESULTS IN UNITS OF MREM/QUARTER LOCATION SAMPLES PERIOD PERIOD PERIOD MEAN ANALYZED MINIMUM MAXIMUM +/- 2 S.D.

INNER RING 144 17 29 23 +/- 6 OUTER RING 128 18 29 24 +/- 6 SPECIAL INTEREST 27 17 28 21 +/- 6 OTHER 56 18 27 22 +/- 5 CONTROL 8 18 21 19 +/- 3 INNER RING STATIONS - BY-101-1, BY-101-2, BY-102-1, BY-102-2, BY-103-1, BY-103-2, BY-103-3, BY-104-1, BY-104-2, BY-104-3, BY-105-1, BY-105-2, BY-106-1, BY-106-2, BY-107-1, BY-107-2, BY-107-3, BY-108-1, BY-108-2, BY-109-1, BY-109-2, BY-110-1, BY-110-2, BY-111-3, BY-111-4, BY-112-3, BY-112-4, BY-113-1, BY-113-2, BY-114-1, BY-114-2, BY-115-1, BY-115-2, BY-116-1, BY-116-2, BY-116-3 OUTER RING STATIONS - BY-201-3, BY-201-4, BY-202-1, BY-202-2, BY-203-1, BY-203-2, BY-204-1, BY-204-2, BY-205-1, BY-205-2, BY-206-1, BY-206-2, BY-207-1, BY-207-2, BY-208-1, BY-208-2, BY-209-1, BY-209-4, BY-210-3, BY-210-4, BY-211-1, BY-211-4, BY-212-1, BY-212-4, BY-213-1, BY-213-4, BY-214-1, BY-214-4, BY-215-1, BY-215-4, BY-216-1, BY-216-2 SPECIAL INTEREST STATIONS - BY-301-1, BY-302-1, BY-309-1, BY-309-2, BY-309-3, BY-309-4, BY-314-1, OTHER STATIONS - BY-01-1, BY-01-2, BY-04-1, BY-04-2, BY-06-1, BY-06-2, BY-21-1, BY-21-2, BY-22-1, BY-22-2, BY-23-1, BY-23-2, BY-24-1, BY-24-2 CONTROL STATIONS - BY-08-1, BY-08-2 Page 68 of 206 C-17

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

Collected in the Vicinity of BNGS, 2000 - 2014 BY-12 Oregon Pool of Rock River, Downstream 10.0 8.0 6.0 pCi/L 4.0 2.0 0.0 01-25-00 01-19-03 01-13-06 01-07-09 01-02-12 12-27-14 BY-29 (C) Byron, Rock River Upstream 14.0 12.0 10.0 8.0 pCi/L 6.0 4.0 2.0 0.0 01-25-00 01-19-03 01-13-06 01-07-09 01-02-12 12-27-14 DUE TO VENDOR CHANGE IN 2005, < VALUES ARE LLD VALUES JANUARY THROUGH JUNE 2005 AND MDC VALUES AFTER JUNE 2005 C-18 Page 69 of 206

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

Collected in the Vicinity of BNGS, 2000 - 2014 BY-12 Oregon Pool of Rock River, Downstream 10000 1000 pCi/L 100 10 03-28-00 03-11-03 02-21-06 02-03-09 01-17-12 12-30-14 BY-29 (C) Byron, Rock River Upstream 250 200 150 pCi/L 100 50 0

03-28-00 03-11-03 02-21-06 02-03-09 01-17-12 12-30-14 DUE TO VENDOR CHANGE IN 2005, < VALUES ARE LLD VALUES JANUARY THROUGH JUNE 2005 AND MDC VALUES AFTER JUNE 2005 C-19 Page 70 of 206

FIGURE C-3 Ground Water - Tritium - Station BY-14-1 Collected in the Vicinity of BNGS, 2000 - 2014 BY-14-1 3200 N. German Church Road Well 250 200 150 pCi/L 100 50 0

01-04-00 01-03-03 01-02-06 01-01-09 01-01-12 12-31-14 DUE TO VENDOR CHANGE IN 2005, < VALUES ARE LLD VALUES JANUARY THROUGH JUNE 2005 AND MDC VALUES AFTER JUNE 2005 C-20 Page 71 of 206

FIGURE C-4 Ground Water - Tritium - Stations BY-18-1 Collected in the Vicinity of BNGS, 2010 - 2014 BY-18-1 Calhoun Well 250 200 150 pCi/L 100 50 0

07-01-10 05-25-11 04-17-12 03-11-13 02-02-14 12-27-14 C-21 Page 72 of 206

FIGURE C-5 Ground Water - Tritium - Station BY-32 Collected in the Vicinity of BNGS, 2000 - 2014 BY-32 Wolford Well 250 200 150 pCi/L 100 50 0

01-04-00 01-03-03 01-02-06 01-01-09 01-01-12 12-31-14 DUE TO VENDOR CHANGE IN 2005, < VALUES ARE LLD VALUES JANUARY THROUGH JUNE 2005 AND MDC VALUES AFTER JUNE 2005 C-22 Page 73 of 206

FIGURE C-6 Ground Water - Tritium - Stations BY-35 and BY-36 Collected in the Vicinity of BNGS, 2006 - 2014 BY-35 Vancko Well 250 200 150 pCi/L 100 50 0

04-11-06 01-08-08 10-06-09 07-05-11 04-02-13 12-30-14 BY-36 Blanchard Well 250 200 150 pCi/L 100 50 0

04-11-06 01-08-08 10-06-09 07-05-11 04-02-13 12-30-14 C-23 Page 74 of 206

FIGURE C-7 Ground Water - Tritium - Stations BY-37 Collected in the Vicinity of BNGS, 2006 - 2014 BY-37 Alexander Well 250 200 150 pCi/L 100 50 0

04-11-06 01-08-08 10-06-09 07-05-11 04-02-13 12-30-14 C-24 Page 75 of 206

FIGURE C-8 Air Particulates - Gross Beta - Stations BY-08 (C) and BY-21 Collected in the Vicinity of BNGS, 2000 - 2014 BY-08 (C) Leaf River WNW 60.0 50.0 40.0 10E-03 pCi/m3 30.0 20.0 10.0 0.0 01-04-00 01-03-03 01-02-06 01-01-09 01-01-12 12-31-14 BY-21 Byron Nearsite N 60.0 50.0 40.0 10E-03 pCi/m3 30.0 20.0 10.0 0.0 01-04-00 01-03-03 01-02-06 01-01-09 01-01-12 12-31-14 C-25 Page 76 of 206

FIGURE C-9 Air Particulates - Gross Beta - Stations BY-22 and BY-23 Collected in the Vicinity of BNGS, 2000 - 2014 BY-22 Byron Nearsite SE 60.0 50.0 40.0 10E-03 pCi/m3 30.0 20.0 10.0 0.0 01-04-00 01-03-03 01-02-06 01-01-09 01-01-12 12-31-14 BY-23 Byron Nearsite S 60.0 50.0 40.0 10E-03 pCi/m3 30.0 20.0 10.0 0.0 01-04-00 01-03-03 01-02-06 01-01-09 01-01-12 12-31-14 C-26 Page 77 of 206

FIGURE C-10 Air Particulates - Gross Beta - Station BY-24 Collected in the Vicinity of BNGS, 2000 - 2014 BY-24 Byron Nearsite SW 70.0 60.0 50.0 10E-03 pCi/m3 40.0 30.0 20.0 10.0 0.0 01-04-00 01-03-03 01-02-06 01-01-09 01-01-12 12-31-14 C-27 Page 78 of 206

FIGURE C-11 Air Particulates - Gross Beta - Stations BY-01 and BY-04 Collected in the Vicinity of BNGS, 2005 - 2014 BY-01 Byron N 60.0 50.0 40.0 10E-03 pCi/m3 30.0 20.0 10.0 0.0 07-05-05 05-29-07 04-21-09 03-15-11 02-05-13 12-30-14 BY-04 Paynes Point SE 60.0 50.0 40.0 10E-03 pCi/m3 30.0 20.0 10.0 0.0 07-05-05 05-29-07 04-21-09 03-15-11 02-05-13 12-30-14 Regular analysis of far field air particulate & gross beta did not take place prior to 2005.

C-28 Page 79 of 206

FIGURE C-12 Air Particulates - Gross Beta - Station BY-06 Collected in the Vicinity of BNGS, 2005 - 2014 BY-06 Oregon SSW 60.0 50.0 40.0 10E-03 pCi/m3 30.0 20.0 10.0 0.0 07-05-05 05-29-07 04-21-09 03-15-11 02-05-13 12-30-14 Regular analysis of far field air particulate & gross beta did not take place prior to 2005.

C-29 Page 80 of 206

APPENDIX D INTER-LABORATORY COMPARISON PROGRAM Page 81 of 206

Intentionally left blank Page 82 of 206

TABLE D-1 ANALYTICS ENVIRONMENTAL RADIOACTIVITY CROSS CHECK PROGRAM TELEDYNE BROWN ENGINEERING, 2014 (PAGE 1 OF 3)

Identification Reported Known Ratio (c)

Month/Year Number Matrix Nuclide Units Value (a) Value (b) TBE/Analytics Evaluation (d)

March 2014 E10854 Milk Sr-89 pCi/L 95.1 91.7 1.04 A Sr-90 pCi/L 10.9 15.1 0.72 W E10855 Milk I-131 pCi/L 96.6 98.5 0.98 A Ce-141 pCi/L 112 119 0.94 A Cr-51 pCi/L 449 491 0.91 A Cs-134 pCi/L 186 210 0.89 A Cs-137 pCi/L 250 253 0.99 A Co-58 pCi/L 248 268 0.93 A Mn-54 pCi/L 292 297 0.98 A Fe-59 pCi/L 230 219 1.05 A Zn-65 pCi/L 312 323 0.97 A Co-60 pCi/L 321 337 0.95 A E10857 AP Ce-141 pCi 53.0 53.9 0.98 A Cr-51 pCi 232 223 1.04 A Cs-134 pCi 100 95.3 1.05 A Cs-137 pCi 122 115 1.06 A Co-58 pCi 122 121 1.01 A Mn-54 pCi 135 135 1.00 A Fe-59 pCi 111 99.3 1.12 A Zn-65 pCi 140 147 0.95 A Co-60 pCi 187 153 1.22 W E10856 Charcoal I-131 pCi 74.1 76.4 0.97 A E10858 Water Fe-55 pCi/L 2090 1760 1.19 A June 2014 E10913 Milk Sr-89 pCi/L 85.9 91.3 0.94 A Sr-90 pCi/L 13.8 14.5 0.95 A E10914 Milk I-131 pCi/L 86.5 90.9 0.95 A Ce-141 pCi/L 111 124 0.90 A Cr-51 pCi/L 255 253 1.01 A Cs-134 pCi/L 147 162 0.91 A Cs-137 pCi/L 123 120 1.03 A Co-58 pCi/L 105 112 0.94 A Mn-54 pCi/L 155 156 0.99 A Fe-59 pCi/L 106 102 1.04 A Zn-65 pCi/L 251 252 1.00 A Co-60 pCi/L 218 224 0.97 A E10916 AP Ce-141 pCi 95.1 92.6 1.03 A Cr-51 pCi 215 190 1.13 A Cs-134 pCi 122 122 1.00 A Cs-137 pCi 95.1 89.8 1.06 A Co-58 pCi 88.7 84.1 1.05 A Mn-54 pCi 115 116 0.99 A Fe-59 pCi 72.6 76.7 0.95 A Zn-65 pCi 193 189 1.02 A Co-60 pCi 179 168 1.07 A E10915 Charcoal I-131 pCi 85.6 85.2 1.00 A E10917 Water Fe-55 pCi/L 1680 1810 0.93 A D-1 Page 83 of 206

TABLE D-1 ANALYTICS ENVIRONMENTAL RADIOACTIVITY CROSS CHECK PROGRAM TELEDYNE BROWN ENGINEERING, 2014 (PAGE 2 OF 3)

Identification Reported Known Ratio (c)

Month/Year Number Matrix Nuclide Units Value (a) Value (b) TBE/Analytics Evaluation (d)

September 2014 E10946 Milk Sr-89 pCi/L 90.7 96.9 0.94 A Sr-90 pCi/L 14.0 16.4 0.85 A E10947 Milk I-131 pCi/L 92.0 97.6 0.94 A Ce-141 pCi/L 117 126 0.93 A Cr-51 pCi/L 281 288 0.98 A Cs-134 pCi/L 141 158 0.89 A Cs-137 pCi/L 186 193 0.96 A Co-58 pCi/L 137 143 0.96 A Mn-54 pCi/L 138 142 0.97 A Fe-59 pCi/L 162 158 1.03 A Zn-65 pCi/L 75.2 73.0 1.03 A Co-60 pCi/L 286 297 0.96 A E10949 AP Ce-141 pCi 97.8 82.1 1.19 A Cr-51 pCi 212 188 1.13 A Cs-134 pCi 106 103 1.03 A Cs-137 pCi 131 126 1.04 A Co-58 pCi 85.7 93.0 0.92 A Mn-54 pCi 92.8 92.3 1.01 A Fe-59 pCi 113 103 1.10 A Zn-65 pCi 53.2 47.5 1.12 A Co-60 pCi 202 193 1.05 A E10948 Charcoal I-131 pCi 83.9 89.8 0.93 A E10950 Water Fe-55 pCi/L 2010 1720 1.17 A E10951 Soil Ce-141 pCi/g 0.208 0.186 1.12 A Cr-51 pCi/g 0.398 0.425 0.94 A Cs-134 pCi/g 0.216 0.233 0.93 A Cs-137 pCi/g 0.398 0.365 1.09 A Co-58 pCi/g 0.197 0.211 0.93 A Mn-54 pCi/g 0.242 0.209 1.16 A Fe-59 pCi/g 0.238 0.233 1.02 A Zn-65 pCi/g 0.117 0.108 1.08 A Co-60 pCi/g 0.447 0.438 1.02 A December 2014 E11078 Milk Sr-89 pCi/L 85.7 95.7 0.90 A Sr-90 pCi/L 12.9 15.6 0.83 A E11079 Milk I-131 pCi/L 85.9 95.1 0.90 A Ce-141 pCi/L 205 219 0.94 A Cr-51 pCi/L 402 406 0.99 A Cs-134 pCi/L 156 164 0.95 A Cs-137 pCi/L 194 198 0.98 A Co-58 pCi/L 122 130 0.94 A Mn-54 pCi/L 220 225 0.98 A Fe-59 pCi/L 183 175 1.05 A Zn-65 pCi/L 287 297 0.97 A Co-60 pCi/L 224 235 0.95 A D-2 Page 84 of 206

TABLE D-1 ANALYTICS ENVIRONMENTAL RADIOACTIVITY CROSS CHECK PROGRAM TELEDYNE BROWN ENGINEERING, 2014 (PAGE 3 OF 3)

Identification Reported Known Ratio (c)

Month/Year Number Matrix Nuclide Units Value (a) Value (b) TBE/Analytics Evaluation (d)

December 2014 E11081 AP Ce-141 pCi 96.4 102 0.95 A Cr-51 pCi 171 190 0.90 A Cs-134 pCi 73.1 76.9 0.95 A Cs-137 pCi 99.0 92.6 1.07 A Co-58 pCi 57.5 60.8 0.95 A Mn-54 pCi 107 105 1.02 A Fe-59 pCi 74.2 81.6 0.91 A Zn-65 pCi 144 139 1.04 A Co-60 pCi 114 110 1.04 A E11080 Charcoal I-131 pCi 93.5 98.2 0.95 A E11082 Water Fe-55 pCi/L 1760 1970 0.89 A (a) Teledyne Brown Engineering reported result.

(b) 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.

(c) Ratio of Teledyne Brown Engineering to Analytics results.

(d) Analytics evaluation based on TBE internal QC limits: A= Acceptable, reported result falls within ratio limits of 0.80-1.20.

W-Acceptable with warning, reported result falls within 0.70-0.80 or 1.20-1.30. N = Not Acceptable, reported result falls outside the ratio limits of < 0.70 and > 1.30.

D-3 Page 85 of 206

TABLE D-2 ERA ENVIRONMENTAL RADIOACTIVITY CROSS CHECK PROGRAM TELEDYNE BROWN ENGINEERING, 2014 (PAGE 1 OF 1)

Identification Reported Known Acceptance Month/Year Number Media Nuclide Units Value (a) Value (b) Limits Evaluation (c)

May 2014 RAD-97 Water Sr-89 pCi/L 38.25 36.7 27.5 - 43.6 A Sr-90 pCi/L 24.65 26.5 19.2 - 30.9 A Ba-133 pCi/L 89.1 87.9 74.0 - 96.7 A Cs-134 pCi/L 45.55 44.3 35.5 - 48.7 A Cs-137 pCi/L 91.15 89.1 80.2 - 101 A Co-60 pCi/L 65.10 64.2 57.8 - 73.1 A Zn-65 pCi/L 244 235 212 - 275 A Gr-A pCi/L 45.65 61.0 31.9 - 75.8 A Gr-B pCi/L 27.95 33.0 21.4 - 40.7 A I-131 pCi/L 23.75 25.7 21.3 - 30.3 A U-Nat pCi/L 9.61 10.2 7.95 - 11.8 A H-3 pCi/L 8435 8770 7610 - 9650 A MRAD-20 Filter Gr-A pCi/filter 28.0 46.0 15.4 - 71.4 A November 2014 RAD-99 Water Sr-89 pCi/L 30.4 31.4 22.8 - 38.1 A Sr-90 pCi/L 18.6 21.8 15.6 - 25.7 A Ba-133 pCi/L 46.8 49.1 40.3 - 54.5 A Cs-134 pCi/L 88.0 89.8 73.7 - 98.8 A Cs-137 pCi/L 99.0 98.8 88.9 - 111 A Co-60 pCi/L 92.5 92.1 82.9 - 104 A Zn-65 pCi/L 325 310 279 - 362 A Gr-A pCi/L 29.9 37.6 19.4 - 48.1 A Gr-B pCi/L 27.5 27.4 17.3 - 35.3 A I-131 pCi/L 15.8 20.3 16.8 - 24.4 N (1)

U-Nat pCi/L 5.74 5.80 4.34 - 6.96 A H-3 pCi/L 6255 6880 5940 - 7570 A MRAD-21 Filter Gr-A pCi/filter 27.3 36.9 12.4 - 57.3 A (1) The Iodine-131 was evaluated as failed with a ratio of 0.778. No cause could be found for the slightly low activity. TBE would evaluate this as acceptablle with warning. A rerun was not possible due to I-131 decay. All other ERA Iodine-131 evaluations since 2004 have been acceptable. NCR 14-08 (a) Teledyne Brown Engineering reported result.

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

(c) ERA evaluation: A=acceptable. Reported result falls within the Warning Limits. NA=not acceptable. Reported result falls outside of the Control Limits. CE=check for Error. Reported result falls within the Control Limits and outside of the Warning Limit.

D-4 Page 86 of 206

TABLE D-3 DOE'S MIXED ANALYTE PERFORMANCE EVALUATION PROGRAM (MAPEP)

TELEDYNE BROWN ENGINEERING, 2014 (PAGE 1 OF 2)

Identification Reported Known Acceptance Month/Year Number Media Nuclide* Units Value (a) Value (b) Range Evaluation (c)

March 2014 14-MaW30 Water Am-241 Bq/L 0.764 0.720 0.504 - 0.936 A Cs-134 Bq/L 20.7 23.1 16.2 - 30 0 A Cs-137 Bq/L 28.0 28.9 20.2 - 37.6 A Co-57 Bq/L 26.5 27.5 19.3 - 35.8 A Co-60 Bq/L 15.6 16.0 11.2 - 20.8 A H-3** Bq/L NR 321 225 - 417 N (3)

Mn-54 Bq/L 13.5 13.9 9.7 - 18.1 A Ni-63 Bq/L NR 34.0 23.8 - 44.2 N (3)

Pu-238 Bq/L 0.911 0.828 0.580 - 1.076 Pu-239/240 Bq/L 0.751 0.676 0.473 - 0.879 K-40 Bq/L NR (1) N (3)

Sr-90** Bq/L NR 8.51 5.96 - 11.06 N (3)

U-234/233** Bq/L NR 0.225 0.158 - 0.293 N (3)

U-238** Bq/L NR 1.45 1.02 - 1.89 N (3)

Zn-65 Bq/L -0.201 (1) A 14-MaS30 Soil Cs-134 Bq/kg 2.02 (1) A Cs-137 Bq/kg 1300 1238 867 - 1609 A Co-57 Bq/kg 1069 966 676 - 1256 A Co-60 Bq/kg 1.32 1.22 (2) A Mn-54 Bq/kg 1510 1430 1001 - 1859 A K-40 Bq/kg 669 622 435 - 809 A Sr-90 Bq/kg 4.14 (1) A Zn-65 Bq/kg 763 695 487 - 904 A 14-RdF30 AP Cs-134** Bq/sample NR 1.91 1.34 - 2.48 N (3)

Cs-137** Bq/sample NR 1.76 1.23 - 2.29 N (3)

Co-57** Bq/sample NR (1) N (3)

Co-60** Bq/sample NR 1.39 0.97 - 1.81 N (3)

Mn-54** Bq/sample NR (1) N (3)

Sr-90 Bq/sample 0.8220 1.18 0.83 - 1.53 N (3)

Zn-65** Bq/sample NR (1) N (3) 14-GrF30 AP Gr-A Bq/sample 0.606 1.77 0.53 - 3.01 A Gr-B Bq/sample 0.7507 0.77 0.39 - 1.16 A 14-RdV30 Vegetation Cs-134 Bq/sample 5.96 6.04 4.23 - 7.85 A Cs-137 Bq/sample 5.06 4.74 3.32 - 6.16 A Co-57 Bq/sample 11.8 10.1 7.1 - 13.1 A Co-60 Bq/sample 7.34 6.93 4.85 - 9.01 A Mn-54 Bq/sample 8.95 8.62 6.03 - 11.21 A Sr-90 Bq/sample 1.23 1.46 1.02 - 1.90 A Zn-65 Bq/sample 8.91 7.86 5.50 - 10.22 A D-5 Page 87 of 206

TABLE D-3 DOE'S MIXED ANALYTE PERFORMANCE EVALUATION PROGRAM (MAPEP)

TELEDYNE BROWN ENGINEERING, 2014 (PAGE 2 OF 2)

Identification Reported Known Acceptance Month/Year Number Media Nuclide* Units Value (a) Value (b) Range Evaluation (c)

September 2014 14-MaW31 Water Am-241 Bq/L 0.705 0.88 0.62 - 1.14 A Cs-134*** Bq/L NR (1) N (4)

Cs-137*** Bq/L NR 18.4 12.9 - 23.9 N (4)

Co-57*** Bq/L NR 24.7 17.3 - 32.1 N (4)

Co-60*** Bq/L NR 12.4 8.7 - 16.1 N (4)

Mn-54*** Bq/L NR 14.0 9.8 - 18.2 N (4)

Ni-63 Bq/L 24.07 24.6 17.2 - 32.0 A Pu-238 Bq/L 0.591 0.618 0.433 - 0.803 A Pu-239/240 Bq/L 0.0153 0.0048 (2) A K-40*** Bq/L NR 161 113 - 209 N (4)

Zn-65*** Bq/L NR 10.9 7.6 - 14.2 N (4) 14-MaS31 Soil Cs-134*** Bq/kg NR 622 435 - 809 N (4)

Cs-137*** Bq/kg NR (1) N (4)

Co-57*** Bq/kg NR 1116 781 - 1451 N (4)

Co-60*** Bq/kg NR 779 545 - 1013 N (4)

Mn-54*** Bq/kg NR 1009 706 - 1312 N (4)

K-40*** Bq/kg NR 824 577 - 1071 N (4)

Sr-90 Bq/kg 694 858 601 - 1115 A Zn-65*** Bq/kg NR 541 379 - 703 N (4) 14-RdF31 AP Sr-90 Bq/sample 0.310 0.703 0.492 - 0.914 N (4) 14-GrF31 AP Gr-A Bq/sample 0.153 0.53 0.16 - 0.90 N (4)

Gr-B Bq/sample 0.977 1.06 0.53 - 1.59 A September 2014 14-RdV31 Vegetation Cs-134 Bq/sample 7.31 7.38 5.17 - 9.59 A Cs-137 Bq/sample 8.93 8.14 5.70 - 10.58 A Co-57 Bq/sample 10.8 9.2 6.4 - 12.0 A Co-60 Bq/sample 6.31 6.11 4.28 - 7.94 A Mn-54 Bq/sample 7.76 7.10 4.97 - 9.23 A Sr-90 Bq/sample 0.738 0.85 0.60 - 1.11 A Zn-65 Bq/sample 7.16 6.42 4.49 - 8.35 A

The MAPEP cross check isotope list has been reduced due to duplication of effort or analysis not being performed for clients.

- These nuclides are no longer part of the TBE cross check program due to duplication of effort or analysis not being performed for clients. MAPEP evaluates non-reported analyses as failed if they were reported in the previous series.

- - All future gamma cross check samples for these isotopes will be provided by Analytics.

(1) False positive test.

(2) Sensitivity evaluation.

(3) Water, Ni-63 overlooked when reporting, but the result of 32.7 +- 1.69 would have passed the acceptance criteria. NCR 14-04 Water , the non-detected K-40 was overlooked when reporting, but would have passed the false positive test. NCR 14-04 AP, Sr-90 rerun was within the low range of the acceptqance criteria. The original and rerun results were statistically the same. No cause could be identified for the slightly low Sr-90 activity. NCR 14-04 For non reported (NR) analyses, MAPEP evaluates as failed if they were reported in the previous series. NCR 14-04 (4) AP, Sr-90 gravimetric yield was very high at 117%. Could indicate larger than normal amounts of calcium in the AP. A second fuming HNO 3 separation would be required to remove the excess calcium. NCR 14-09 AP, Gr-Alpha was counted on the wrong side. When flipped over and recounted the results were acceptable. NCR 14-09 For non reported (NR) analyses, MAPEP evaluates as failed if they were reported in the previous series. NCR 14-09 (a) Teledyne Brown Engineering reported result.

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

(c) DOE/MAPEP evaluation: A=acceptable, W=acceptable with warning, N=not acceptable.

D-6 Page 88 of 206

a TABLE D-4 ERA (a) STATISTICAL

SUMMARY

PROFICIENCY TESTING PROGRAM ENVIRONMENTAL, INC., 2014 (Page 1 of 1)

Concentration (pCi/L)

Lab Code Date Analysis Laboratory ERA Control Result b Result c Limits Acceptance ERW-1384 04/07/14 Sr-89 40.29 +/- 5.76 36.70 27.50 - 43.60 Pass ERW-1384 04/07/14 Sr-90 24.08 +/- 2.35 26.50 19.20 - 30.90 Pass ERW-1385 04/07/14 Ba-133 78.23 +/- 3.93 87.90 74.00 - 96.70 Pass ERW-1385 04/07/14 Co-60 62.75 +/- 3.53 64.20 57.80 - 73.10 Pass ERW-1385 04/07/14 Cs-134 44.97 +/- 3.99 44.30 35.50 - 48.70 Pass ERW-1385 04/07/14 Cs-137 88.54 +/- 4.93 89.10 80.20 - 101.00 Pass ERW-1385 04/07/14 Zn-65 249.1 +/- 10.44 235.0 212.0 - 275.0 Pass ERW-1388 04/07/14 Gr. Alpha 56.70 +/- 2.47 61.00 31.90 - 75.80 Pass ERW-1388 04/07/14 Gr. Beta 32.10 +/- 1.20 33.00 21.40 - 40.70 Pass ERW-1391 04/07/14 I-131 25.52 +/- 1.12 25.70 21.30 - 30.30 Pass ERW-1394 04/07/14 Uranium 10.76 +/- 0.74 10.20 7.95 - 11.80 Pass ERW-1397 04/07/14 H-3 8982 +/- 279 8770 7610 - 9650 Pass ERW-5382 10/06/14 Sr-89 29.40 +/- 5.32 31.40 22.80 - 38.10 Pass ERW-5382 10/06/14 Sr-90 19.19 +/- 1.85 21.80 15.60 - 25.70 Pass ERW-5385 10/06/14 Ba-133 43.54 +/- 4.54 49.10 40.30 - 54.50 Pass ERW-5385 10/06/14 Cs-134 81.95 +/- 7.49 89.80 73.70 - 98.80 Pass ERW-5385 10/06/14 Cs-137 95.76 +/- 5.50 98.80 88.90 - 111.00 Pass ERW-5385 10/06/14 Co-60 90.25 +/- 2.77 92.10 82.90 - 104.00 Pass ERW-5385 10/06/14 Zn-65 327.4 +/- 23.3 310.00 279.0 - 362.0 Pass ERW-5388 10/06/14 Gr. Alpha 30.88 +/- 8.05 37.60 19.40 - 46.10 Pass ERW-5388 10/06/14 G. Beta 20.47 +/- 4.75 27.40 17.30 - 35.30 Pass ERW-5392 10/06/14 I-131 19.58 +/- 2.35 20.30 16.80 - 24.40 Pass ERW-5394 10/06/14 Uranium 5.51 +/- 0.37 5.80 4.34 - 6.96 Pass ERW-5397 10/06/14 H-3 6876 +/- 383 6880 5940 - 7570 Pass a Results obtained by Environmental, Inc., Midwest Laboratory as a participant in the crosscheck program for proficiency testing in drinking water conducted by Environmental Resources Associates (ERA).

b Unless otherwise indicated, the laboratory result is given as the mean +/- standard deviation for three determinations.

c Results are presented as the known values, expected laboratory precision (1 sigma, 1 determination) and control limits as provided by ERA.

D-7 Page 89 of 206

TABLE D-5 DOE'S MIXED ANALYTE PERFORMANCE EVALUATION PROGRAM (MAPEP)

ENVIRONMENTAL, INC., 2014 (Page 1 of 2)

Concentration a Known Control Lab Code b Date Analysis Laboratory result Activity Limits c Acceptance MAW-1140 02/01/14 Gr. Alpha 0.77 +/- 0.06 0.85 0.26 - 1.44 Pass MAW-1140 02/01/14 Gr. Beta 4.31 +/- 0.08 4.19 2.10 - 6.29 Pass MAW-1184 02/01/14 Fe-55 0.40 +/- 3.20 0.00 -0.01 - 2.00 Pass MAW-1184 02/01/14 H-3 345.10 +/- 10.60 321.00 225.00 - 417.00 Pass MAW-1184 02/01/14 Ni-63 32.40 +/- 3.20 34.00 23.80 - 44.20 Pass MAW-1184 02/01/14 Pu-238 1.28 +/- 0.12 0.83 0.58 - 1.08 Fail (1)

MAW-1184 02/01/14 Pu-239/240 0.91 +/- 0.10 0.68 0.47 - 0.88 Fail (1)

MAW-1184 02/01/14 Sr-90 7.00 +/- 0.70 8.51 5.96 - 11.06 Pass MAW-1184 02/01/14 U-233/234 0.20 +/- 0.07 0.23 0.16 - 0.29 Pass MAW-1184 02/01/14 U-238 1.25 +/- 0.18 1.45 1.02 - 1.89 Pass MAW-1184 02/01/14 Co-57 27.86 +/- 0.38 27.50 19.30 - 35.80 Pass MAW-1184 02/01/14 Co-60 15.99 +/- 0.27 16.00 11.20 - 20.80 Pass MAW-1184 02/01/14 Cs-134 21.85 +/- 0.54 23.10 16.20 - 30.00 Pass MAW-1184 02/01/14 Cs-137 28.74 +/- 0.49 28.90 20.20 - 37.60 Pass MAW-1184 02/01/14 K-40 1.80 +/- 2.00 0.00 0.00 - 10.00 Pass MAW-1184 02/01/14 Mn-54 14.06 +/- 0.40 13.90 9.70 - 18.10 Pass MAW-1184 02/01/14 Zn-65 0.00 +/- 0.19 0.00 -0.01 - 0.00 Pass MAVE-1148 02/01/14 Co-57 11.63 +/- 0.19 10.10 7.10 - 13.10 Pass MAVE-1148 02/01/14 Co-60 7.28 +/- 0.18 6.93 4.85 - 9.01 Pass MAVE-1148 02/01/14 Cs-134 6.29 +/- 0.29 6.04 4.23 - 7.85 Pass MAVE-1148 02/01/14 Cs-137 5.18 +/- 0.20 4.74 3.32 - 6.16 Pass MAVE-1148 02/01/14 Mn-54 9.22 +/- 0.26 8.62 6.03 - 11.21 Pass MAVE-1148 02/01/14 Zn-65 8.59 +/- 0.40 7.86 5.50 - 10.22 Pass MAAP-1151 02/01/14 Co-57 1.60 +/- 0.05 0.00 NA Fail (2)

MAAP-1151 02/01/14 Co-60 1.38 +/- 0.08 1.39 0.97 - 1.81 Pass MAAP-1151 02/01/14 Cs-134 1.75 +/- 0.11 1.91 1.34 - 2.48 Pass MAAP-1151 02/01/14 Cs-137 1.81 +/- 0.10 1.76 1.23 - 2.29 Pass MAAP-1151 02/01/14 Mn-54 0.01 +/- 0.03 0.00 NA Pass MAAP-1151 02/01/14 Zn-65 -0.24 +/- 0.09 0.00 -0.50 - 1.00 Pass MAAP-1151 02/01/14 Sr-90 1.11 +/- 0.14 1.18 0.83 - 1.53 Pass MAAP-1154 02/01/14 Gr. Alpha 0.56 +/- 0.06 1.77 0.53 - 3.01 Pass MAAP-1154 02/01/14 Gr. Beta 0.98 +/- 0.06 0.77 0.39 - 1.16 Pass MASO-1146 02/01/14 Ni-63 4.80 +/- 15.30 0.00 NA Pass MASO-1146 02/01/14 Co-57 1064.50 +/- 3.60 966.00 676.00 - 1256.00 Pass MASO-1146 02/01/14 Co-60 1.70 +/- 0.50 1.22 (3) Pass MASO-1146 02/01/14 Cs-134 6.10 +/- 1.80 0.00 NA Fail (4)

MASO-1146 02/01/14 Cs-137 1364.30 +/- 5.30 1238.00 867.00 - 1609.00 Pass MASO-1146 02/01/14 K-40 728.90 +/- 15.90 622.00 435.00 - 809.00 Pass MASO-1146 02/01/14 Mn-54 1588.00 +/- 6.00 1430.00 1001.00 - 1859.00 Pass MASO-1146 02/01/14 Zn-65 763.50 +/- 6.80 695.00 487.00 - 904.00 Pass MASO-1146 02/01/14 Sr-90 1.23 +/- 1.37 0.00 NA Pass D-8 Page 90 of 206

TABLE D-5 DOE'S MIXED ANALYTE PERFORMANCE EVALUATION PROGRAM (MAPEP)

ENVIRONMENTAL, INC., 2014 (Page 2 of 2)

Concentration a Known Control Lab Code b Date Analysis Laboratory result Activity Limits c Acceptance MASO-4439 08/01/14 Ni-63 771.62 +/- 23.29 980.00 686.00 - 1274.00 Pass MASO-4439 08/01/14 Sr-90 778.34 +/- 17.82 858.00 601.00 - 1115.00 Pass MASO-4439 08/01/14 Cs-134 520.60 +/- 7.09 622.00 435.00 - 809.00 Pass MASO-4439 08/01/14 Co-57 1135.00 +/- 7.40 1116.00 781.00 - 1451.00 Pass MASO-4439 08/01/14 Co-60 768.20 +/- 7.70 779.00 545.00 - 1013.00 Pass MASO-4439 08/01/14 Mn-54 1050.70 +/- 12.60 1009.00 706.00 - 1312.00 Pass MASO-4439 08/01/14 Zn-65 407.89 +/- 15.03 541.00 379.00 - 703.00 Pass MAW-4431 08/01/14 Am-241 0.79 +/- 0.08 0.88 0.62 - 1.14 Pass MAW-4431 08/01/14 Cs-137 18.62 +/- 0.54 18.40 12.90 - 23.90 Pass MAW-4431 08/01/14 Co-57 24.85 +/- 0.42 24.70 17.30 - 32.10 Pass MAW-4431 08/01/14 Co-60 12.27 +/- 0.38 12.40 8.70 - 16.10 Pass MAW-4431 08/01/14 H-3 207.20 +/- 10.60 208.00 146.00 - 270.00 Pass MAW-4431 08/01/14 Fe-55 55.10 +/- 14.80 31.50 22.10 - 41.00 Fail (5)

MAW-4431 08/01/14 Mn-54 14.36 +/- 0.53 14.00 9.80 - 18.20 Pass MAW-4431 08/01/14 Zn-65 11.46 +/- 0.78 10.90 7.60 - 14.20 Pass MAW-4493 08/01/14 Gr. Alpha 0.93 +/- 0.07 1.40 0.42 - 2.38 Pass MAW-4493 08/01/14 Gr. Beta 6.31 +/- 1.35 6.50 3.25 - 9.75 Pass MAAP-4433 08/01/14 Sr-90 0.74 +/- 0.10 0.70 0.49 - 0.91 Pass MAAP-4444 08/01/14 Sr-89 7.82 +/- 0.52 9.40 6.60 - 12.20 Pass MAAP-4444 08/01/14 Sr-90 0.76 +/- 0.10 0.76 0.53 - 0.99 Pass MAVE-4436 08/01/14 Cs-134 7.49 +/- 0.18 7.38 5.17 - 9.59 Pass MAVE-4436 08/01/14 Co-57 11.20 +/- 0.19 9.20 6.40 - 12.00 Pass MAVE-4436 08/01/14 Co-60 6.84 +/- 0.17 6.11 4.28 - 7.94 Pass MAVE-4436 08/01/14 Mn-54 8.11 +/- 0.26 7.11 4.97 - 9.23 Pass MAVE-4436 08/01/14 Zn-65 7.76 +/- 0.43 6.42 4.49 - 8.35 Pass a

Results are reported in units of Bq/kg (soil), Bq/L (water) or Bq/total sample (filters, vegetation).

b Laboratory codes as follows: MAW (water), MAAP (air filter), MASO (soil), MAVE (vegetation).

c MAPEP results are presented as the known values and expected laboratory precision (1 sigma, 1 determination) and control limits as defined by the MAPEP. A known value of "zero" indicates an analysis was included in the testing series as a "false positive". MAPEP does not provide control limits.

(1) The high bias on the plutonium crosscheck samples was traced to contamination from a newly purchased standard.

The results of reanalysis with replacement tracer purchased from NIST:

MAW-1184 Pu-238 0.68 +/- 0.10 Bq / L MAW-1184 Pu-239/240 0.66 +/- 0.10 Bq / L (2) Interference from Eu-152 resulted in misidentification of Co-57.

(3) Provided in the series for "sensitivity evaluation". MAPEP does not provide control limits.

(4) False positive test. Long sample counting time lead to interference from naturally occuring Bi-214 in sample matrix with a close spectral energy.

(5) Result of reanalysis Fe-55 32.63 +/- 16.30 Bq/L D-9 Page 91 of 206

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APPENDIX E EFFLUENT REPORT Page 93 of 206

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TABLE OF CONTENTS

SUMMARY

........................................................................................................................... 1 INTRODUCTION ................................................................................................................. 2 1.1. EFFLUENTS ..................................................................................................... 3 1.2. Gaseous Effluents to the Atmosphere................................................... 3 1.3. Liquids Released to Rock River ............................................................. 3 2.0. SOLID RADIOACTIVE WASTE..................................................................... 4 3.1. DOSE TO MAN................................................................................................. 4 3.2. Gaseous Effluent Pathways .................................................................. 4 3.2.1. Noble Gases ............................................................................ 4 3.2.1.1. Gamma Dose Rates .................................................. 4 3.2.1.2. Beta Air and Skin Dose Rate..................................... 4 3.2.2. Radioactive Iodine & Particulate .............................................. 5 3.2.3. Gaseous Total Dose ................................................................ 6 3.3. Liquid Effluent Pathways ....................................................................... 6 3.4. Total Dose ............................................................................................. 6 3.5. Assessment of Dose to Member of Public ............................................ 6 4.0. SITE METEOROLOGY..................................................................................... 7 i

Page 95 of 206

Table of Contents (cont.)

APPENDIX E-1 DATA TABLES AND FIGURES............................................................. E-1.1 Station Releases Table 1.1-1 Gaseous Effluents .................................................................... E-1.2 Table 1.2-1 Liquid Effluents ......................................................................... E-1.4 Table 3.1-1 Maximum Doses Resulting from Liquid Releases .................... E-1.6 Table 3.2-1 Maximum Doses Resulting from Gaseous Releases ............... E-1.8 Table 3.3-1 40CFR190 Uranium Fuel Cycle Report - Total Dose............... E-1.10 Table 3.4-1 Maximum Doses Resulting from Airborne Releases Based On Concurrent Meteorological Data ......................................... E-1.12 ii Page 96 of 206

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 2.64E-01 mrem. The annual limit on TEDE is 100 mrem.

The assessment of radiation doses to the public is performed in accordance with the ODCM. The results of these analyses confirm that the station is operating in compliance with 10CFR50 Appendix I, 10CFR20 and 40CFR190.

There were no additional operational controls implemented which affected the areas of radiological effluents in 2014.

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.

Page 97 of 206

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-131, 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 2014 gaseous dose was vegetation. The critical pathway for 2014 liquid dose was freshwater fish.

Page 98 of 206

1.1 EFFLUENTS 1.2 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 9.33E-01 curies of fission and activation gases were released with a maximum average quarterly release rate of 4.32E-02 µCi/sec.

A total of 6.16E-06 curies of 1-131 were released during the year with a maximum average quarterly release rate of 7.58E-07

µCi/sec.

A total of 5.74E-07 curies were released as airborne particulate matter with a maximum average quarterly release rate of 7.30E-08

µCi/sec.

A total of 8.55E+00 curies of other (C-14) radioisotopes were released with a maximum average quarterly release rate of 2.93E-01 µCi/sec.

A total of 8.48E+01 curies of tritium were released with a maximum average quarterly release rate of 3.90E+00 µCi/sec.

Gross alpha-emitting radionuclides were below detectable limits.

1.3 Liquids Released to Rock River A total of 2.78E+10 liters of radioactive liquid wastes containing 1.43E-02 curies of fission and activation products were discharged with a maximum quarterly average concentration of 8.40E-10

µCi/ml.

A total of 2.94E+03 curies of tritium were discharged with a maximum quarterly average concentration of 2.83E-04 uCi/ml.

A total of 7.68E-04 curies of dissolved and entrained gases were discharged with a maximum quarterly average concentration of 8.82E-11 uCi/ml.

Gross alpha-emitting radionuclides were below detectable limits.

Page 99 of 206

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 2014 Annual Radiological Effluent Release Report.

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

3.2.1 Noble Gases 3.2.1.1 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 4.63E-05 mrad based on measured effluents and average meteorological data, and 9.25E-06 mrad based on measured effluents and concurrent meteorological data.

(Table 3.4-1).

3.2.1.2 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 Page 100 of 206

thickness of 7.0 mg/cm2 and an occupancy factor of 1.0 is used. The skin dose based on measured effluents and average meteorological data was 1.89E-05 mrem, and 1.29E-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 1.58E-05 mrad. The beta air dose based on measured effluents and concurrent meteorological data was 1.30E-05 mrad.

3.2.2 Radioactive Iodine & Particulate The human thyroid exhibits a significant capacity to concentrate ingested or inhaled iodine. I-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-14 are the consumption of vegetation by humans and milk from which animals have ingested C-14 through the consumption of vegetation. With 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 6.96E-01 mrem (child/bone) based on measured effluents and average meteorological data and 7.36E-01 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 1.44E-01 mrem (child) based on measured effluents and average meteorological data and 1.53E-01 mrem based on measured effluents and concurrent meteorological data.

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3.2.3 Gaseous Total Dose The maximum total dose from gaseous releases to any organ was 6.96E-01 mrem (child/bone) based on measured effluents and average meteorological data, and 7.36E-01 mrem (child/bone) based on measured effluents and concurrent meteorological data. The maximum total dose from gaseous releases to the whole body was 1.44E-01 mrem (child) based on measured effluents and average meteorological data, and 1.53E-01 mrem (child) based on measured effluents and concurrent meteorological data.

3.3 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 10 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 GI 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 2.23E-01 mrem (adult/gilli). The maximum dose from liquid releases to the whole body was 1.44E-01 mrem (adult).

3.4 Total Dose The maximum total dose to any organ via both gaseous and liquid effluents to any organ is 7.01E-01 mrem (child/bone). The maximum dose to the whole body via both gaseous and liquid effluents is 2.64E-01 mrem (child).

3.5 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 1.5 mrem to the whole body or 5 mrem to any organ Page 102 of 206

during any calendar quarter and 3 mrem to the whole body or 10 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 10 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 10CFR20 limit on Total Effective Dose Equivalent to individual members of the public is 100 mrem during a calendar year.

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 99.7% during 2014.

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APPENDIX E-1 DATA TABLES AND FIGURES E-1.-1 Page 105 of 206

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Table 1.1-1 RG 1.21 EFFLUENT AND WASTE DISPOSAL REPORT GASEOUS EFFLUENTS - SUMMATION OF ALL RELEASES Unit 1 REPORT FOR 2014 Units QTR 1 QTR 2 QTR 3 QTR 4 YEAR Fission and Activation Gases

1. Total Release Ci 1.81E-01 3.08E-02 1.60E-01 5.54E-02 4.26E-01

2. Avg. Release Rate uCi/sec 2.33E-02 3.92E-03 2.01E-02 6.97E-03 1.35E-02 Iodine-131

1. Total Release Ci 2.03E-06 (1) (1) (1) 2.03E-06

2. Avg. Release Rate uCi/sec 2.62E-07 (1) (1) (1) 6.45E-08 Particulates Half Life >= 8 days

1. Total Release Ci (1) 2.87E-07 (1) (1) 2.87E-07

2. Avg. Release Rate uCi/sec (1) 3.65E-08 (1) (1) 9.10E-09 Others

1. Total Release Ci 8.84E-01 1.11E+00 1.18E+00 1.12E+00 4.30E+00

2. Avg. Release Rate uCi/sec 1.14E-01 1.42E-01 1.48E-01 1.41E-01 1.36E-01 Tritium

1. Total Release Ci 5.57E+00 4.14E+00 3.96E+00 1.25E+01 2.61E+01

2. Avg. Release Rate uCi/sec 7.17E-01 5.27E-01 4.99E-01 1.57E+00 8.29E-01 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 Page 107 of 206

Table 1.1-1 (cont.)

RG 1.21 EFFLUENT AND WASTE DISPOSAL REPORT GASEOUS EFFLUENTS - SUMMATION OF ALL RELEASES Unit 2 REPORT FOR 2014 Units QTR 1 QTR 2 QTR 3 QTR 4 YEAR Fission and Activation Gases

1. Total Release Ci 1.55E-01 1.75E-02 1.58E-01 1.77E-01 5.07E-01

2. Avg. Release Rate uCi/sec 1.99E-02 2.23E-03 1.99E-02 2.23E-02 1.61E-02 Iodine-131

1. Total Release Ci 3.86E-06 (1) 2.77E-07 (1) 4.13E-06

2. Avg. Release Rate uCi/sec 4.96E-07 (1) 3.48E-08 (1) 1.31E-07 Particulates Half Life >= 8 days

1. Total Release Ci (1) 2.87E-07 (1) (1) 2.87E-07

2. Avg. Release Rate uCi/sec (1) 3.65E-08 (1) (1) 9.10E-09 Others

1. Total Release Ci 1.08E+00 1.18E+00 1.13E+00 8.52E-01 4.25E+00

2. Avg. Release Rate uCi/sec 1.39E-01 1.51E-01 1.42E-01 1.07E-01 1.35E-01 Tritium

1. Total Release Ci 1.89E+01 1.01E+01 1.11E+01 1.86E+01 5.87E+01

2. Avg. Release Rate uCi/sec 2.43E+00 1.29E+00 1.40E+00 2.33E+00 1.86E+00 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-1.3 Page 108 of 206

Table 1.2-1 RG 1.21 EFFLUENT AND WASTE DISPOSAL REPORT LIQUID EFFLUENTS - SUMMATION OF ALL RELEASES Unit 1 REPORT FOR 2014 Units QTR 1 QTR 2 QTR 3 QTR 4 YEAR Fission and Activation Products

1. Total Release Ci 2.56E-03 1.29E-03 6.96E-04 2.58E-03 7.13E-03

2. Avg. Diluted Conc. uCi/ml 8.40E-10 3.52E-10 1.79E-10 7.76E-10 5.12E-10 Tritium

1. Total Release Ci 8.62E+02 9.74E+01 3.89E+02 1.24E+02 1.47E+03

2. Avg. Diluted Conc. uCi/ml 2.83E-04 2.65E-05 1.00E-04 3.73E-05 1.06E-04 Dissolved and Entrained Gases

1. Total Release Ci 2.69E-04 (1) 8.93E-05 2.63E-05 3.84E-04

2. Avg. Diluted Conc. uCi/ml 8.82E-11 (1) 2.30E-11 7.91E-12 2.76E-11 Gross Alpha Radioactivity

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

Volume of liquid waste liters 3.05E+09 3.67E+09 3.89E+09 3.32E+09 1.39E+10 (1) Less than minimum detectable activity which meets the lower limit of detection (LLD) requirements of TRM Section 3.11 E-1.4 Page 109 of 206

Table 1.2-1 (cont.)

RG 1.21 EFFLUENT AND WASTE DISPOSAL REPORT LIQUID EFFLUENTS - SUMMATION OF ALL RELEASES Unit 2 REPORT FOR 2014 Units QTR 1 QTR 2 QTR 3 QTR 4 YEAR Fission and Activation Products

1. Total Release Ci 2.56E-03 1.29E-03 6.96E-04 2.58E-03 7.13E-03

2. Avg. Diluted Conc. uCi/ml 8.40E-10 3.52E-10 1.79E-10 7.76E-10 5.12E-10 Tritium

1. Total Release Ci 8.62E+02 9.74E+01 3.89E+02 1.24E+02 1.47E+03

2. Avg. Diluted Conc. uCi/ml 2.83E-04 2.65E-05 1.00E-04 3.73E-05 1.06E-04 Dissolved and Entrained Gases

1. Total Release Ci 2.69E-04 (1) 8.93E-05 2.63E-05 3.84E-04

2. Avg. Diluted Conc. uCi/ml 8.82E-11 (1) 2.30E-11 7.91E-12 2.76E-11 Gross Alpha Radioactivity

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

Volume of liquid waste liters 3.05E+09 3.67E+09 3.89E+09 3.32E+09 1.39E+10 (1) Less than minimum detectable activity which meets the lower limit of detection (LLD) requirements of TRM Section 3.11 E-1.5 Page 110 of 206

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

SUMMARY

Units 1 & 2 Report for: 2014 Unit Range - From: 1 To: 2 Liquid Receptor

PERIOD DOSE BY ORGAN AND AGE GROUP (mrem) ============ ANNUAL 2014 ======

Agegrp Bone Liver Thyroid Kidney Lung GI-LLI Skin TB ADULT 5.28E-03 1.43E-01 1.42E-01 1.42E-01 1.42E-01 2.23E-01 0.00E+00 1.44E-01 TEEN 4.83E-03 1.08E-01 1.07E-01 1.07E-01 1.07E-01 1.64E-01 0.00E+00 1.08E-01 CHILD 5.46E-03 1.20E-01 1.19E-01 1.19E-01 1.19E-01 1.39E-01 0.00E+00 1.20E-01 INFANT 9.40E-05 5.27E-02 5.27E-02 5.27E-02 5.27E-02 5.27E-02 0.00E+00 5.27E-02

SITE DOSE LIMIT ANALYSIS ============================= ANNUAL 2014 ======

Age Dose Limit Max % of Annual - Limit Group Organ (mrem) (mrem) Limit 2014 - Admin. Any Organ ADULT GILLI 2.23E-01 7.50E+00 2.98E+00 2014 - Admin. Total Body ADULT TBODY 1.44E-01 2.25E+00 6.38E+00 2014 - T.Spc. Any Organ ADULT GILLI 2.23E-01 1.00E+01 2.23E+00 Critical Pathway: Fresh Water Fish - Sport (FFSP)

Major Contributors (0% or greater to total)

Nuclide Percentage H-3 6.37E+01 CR-51 4.88E-02 MN-54 2.07E-01 FE-55 5.59E-02 FE-59 7.58E-02 CO-58 1.94E+00 CO-60 2.13E+00 SR-89 2.50E-02 SR-90 5.12E-02 ZR-95 1.89E-03 ZR-97 5.59E-04 NB-95 3.14E+01 TE-132 3.37E-01 I-132 1.06E-05 2014 - T.Spc. Total Body ADULT TBODY 1.44E-01 3.00E+00 4.78E+00 Critical Pathway: Fresh Water Fish - Sport (FFSP)

Major Contributors (0% or greater to total)

Nuclide Percentage H-3 9.91E+01 CR-51 3.02E-04 MN-54 2.00E-02 FE-55 3.54E-02 E-1.6 Page 111 of 206

Table 3.1-1 (cont.)

40CFR190 URANIUM FUEL CYCLE DOSE REPORT Nuclide Percentage FE-59 1.36E-02 CO-58 3.34E-01 CO-60 3.90E-01 SR-89 6.95E-03 SR-90 6.37E-02 ZR-95 6.27E-07 ZR-97 1.28E-09 NB-95 4.33E-03 TE-132 1.04E-02 I-132 3.06E-05 E-1.7 Page 112 of 206

Table 3.2-1 40CFR190 URANIUM FUEL CYCLE DOSE REPORT GASEOUS DOSE

SUMMARY

Units 1 & 2 Report for: 2014 Unit Range - From: 1 To: 2

I&P DOSE LIMIT ANALYSIS ============================== ANNUAL 2014 ======

Age Dose Limit Max % of Annual - Limit Group Organ (mrem) (mrem) Limit 2014 - Admin. Any Organ CHILD BONE 6.96E-01 1.13E+01 6.19E+00 2014 - Admin. Total Body CHILD TBODY 1.44E-01 1.05E+01 1.37E+00 2014 - T.Spc. Any Organ CHILD BONE 6.96E-01 1.50E+01 4.64E+00 Receptor: 5 Composite Crit. Receptor - IP Distance: 800 (meters) Compass Point: SSE Critical Pathway: Vegetation Major Contributors (0% or greater to total)

Nuclide Percentage H-3 0.00E+00 C-14 1.00E+02 CR-51 1.76E-08 CO-58 1.15E-06 CO-60 4.51E-05 ZR-95 1.81E-07 NB-95 7.54E-08 I-131 1.57E-04 I-133 8.27E-06 2014 - T.Spc. Total Body CHILD TBODY 1.44E-01 1.50E+01 9.60E-01 Receptor: 5 Composite Crit. Receptor - IP Distance: 800 (meters) Compass Point: SSE Critical Pathway: Vegetation Major Contributors (0% or greater to total)

Nuclide Percentage H-3 3.33E+00 C-14 9.67E+01 CR-51 8.97E-08 CO-58 9.72E-06 CO-60 2.31E-04 ZR-95 7.99E-07 NB-95 3.52E-07 I-131 4.37E-04 I-133 2.08E-05 E-1.8 Page 113 of 206

Table 3.2-1 (cont.)

40CFR190 URANIUM FUEL CYCLE DOSE REPORT GASEOUS DOSE

SUMMARY

Units 1 & 2 Report for: 2014 Unit Range - From: 1 To: 2

NG DOSE LIMIT ANALYSIS =============================== ANNUAL 2014 ======

Dose Limit Max % of Annual - Limit (mrad) (mrad) Limit 2014 - Admin. Gamma 4.63E-05 7.50E+00 6.18E-04 2014 - Admin. Beta 1.58E-05 1.50E+01 1.05E-04 2014 - T.Spc. Gamma 4.63E-05 1.00E+01 4.63E-04 Receptor: 4 Composite Crit. Receptor - NG Distance: 800 (meters) Compass Point: SSE Nuclide Percentage AR-41 5.94E+01 KR-85M 1.01E-02 XE-135 1.86E+00 XE-133M 3.32E-02 XE-133 3.87E+01 2014 - T.Spc. Beta 1.58E-05 2.00E+01 7.89E-05 Receptor: 4 Composite Crit. Receptor - NG Distance: 800 (meters) Compass Point: SSE Nuclide Percentage AR-41 1.51E+01 KR-85M 1.17E-02 XE-135 1.72E+00 XE-133M 1.08E-01 XE-133 8.30E+01 E-1.9 Page 114 of 206

Table 3.2-1 (cont.)

40CFR190 URANIUM FUEL CYCLE DOSE REPORT Units 1 & 2 Report for: 2014 Unit Range - From: 1 To: 2

MAXIMUM DOSE ANALYSIS ================================ ANNUAL 2014 ======

Age Dose Dose Type Group Organ (mrem)

Any Organ CHILD BONE 7.01E-01 Liquid Receptor: 0 Liquid Receptor Gaseous Receptor: 5 Composite Crit. Receptor - IP Distance: 800 (meters) Compass Point: SSE Liquid Dose: 5.46E-03 % of Total: 7.79E-01 Critical Pathway: Fresh Water Fish - Sport (FFSP)

Major Contributors (0% or greater to total) Nuclide Percentage H-3 0.00E+00 CR-51 0.00E+00 MN-54 0.00E+00 FE-55 7.95E+00 FE-59 4.96E-01 CO-58 0.00E+00 CO-60 0.00E+00 SR-89 9.08E+00 SR-90 8.14E+01 ZR-95 1.05E-04 ZR-97 5.53E-07 NB-95 4.52E-01 TE-132 5.93E-01 I-132 1.14E-03 Gaseous Dose: 6.96E-01 % of Total: 9.93E+01 Critical Pathway: Vegetation (VEG)

Major Contributors (0% or greater to total)

Nuclide Percentage H-3 0.00E+00 C-14 1.00E+02 CR-51 1.76E-08 CO-58 1.15E-06 CO-60 4.51E-05 ZR-95 1.81E-07 NB-95 7.54E-08 I-131 1.57E-04 I-133 8.27E-06 E-1.10 Page 115 of 206

Table 3.2-1 (cont.)

40CFR190 URANIUM FUEL CYCLE DOSE REPORT

MAXIMUM DOSE ANALYSIS ================================ ANNUAL 2014 ======

Age Dose Dose Type Group Organ (mrem)

Total Body CHILD TBODY 2.64E-01 Liquid Receptor: 0 Liquid Receptor Gaseous Receptor: 5 Composite Crit. Receptor - IP Distance: 800 (meters) Compass Point: SSE Liquid Dose: 1.20E-01 % of Total: 4.56E+01 Critical Pathway: Fresh Water Fish - Sport (FFSP)

Major Contributors (0% or greater to total) Nuclide Percentage H-3 9.88E+01 CR-51 3.96E-04 MN-54 2.57E-02 FE-55 5.94E-02 FE-59 1.81E-02 CO-58 4.35E-01 CO-60 5.09E-01 SR-89 1.18E-02 SR-90 7.44E-02 ZR-95 9.36E-07 ZR-97 2.14E-09 NB-95 5.71E-03 TE-132 1.44E-02 I-132 4.38E-05 Gaseous Dose: 1.44E-01 % of Total: 5.45E+01 Critical Pathway: Vegetation (VEG)

Major Contributors (0% or greater to total)

Nuclide Percentage H-3 3.33E+00 C-14 9.67E+01 CR-51 8.97E-08 CO-58 9.72E-06 CO-60 2.31E-04 ZR-95 7.99E-07 NB-95 3.52E-07 I-131 4.37E-04 I-133 2.08E-05 E-1.11 Page 116 of 206

Table 3.4-1 The following are the maximum annual calculated cumulative offsite doses resulting from Byron airborne releases in 2014 based on concurrent meteorological data:

Unit 1:

Dose Maximum Value Sector Affected gamma air (1) 6.13 x10-6 mrad North-Northwest beta air (2) 6.41 x10-6 mrad North-Northwest whole body (3) 7.59 x10-2 mrem North-Northwest skin (4) 8.34 x10-6 mrem North-Northwest organ (5) (child-bone) 3.70 x10-1 mrem North-Northwest Unit 1 Compliance Status 10 CFR 50 Appendix I Yearly Objective % of Appendix I gamma air 10.0 mrad 0.00 beta air 20.0 mrad 0.02 whole body 5.0 mrem 1.65 skin 15.0 mrem 0.00 organ 15.0 mrem 2.68 Unit 2:

Sector Dose Maximum Value Affected (1) gamma air 3.12 x10-6 mrad North-Northwest beta air (2) 6.58 x10-6 mrad North-Northwest whole body (3) 7.72 x10-2 mrem North-Northwest skin (4) 4.58 x10-6 mrem North-Northwest organ (5) (child-bone) 3.66 x10-1 mrem North-Northwest Unit 2 Compliance Status 10 CFR 50 Appendix I Yearly Objective % of Appendix I gamma air 10.0 mrad 0.00 beta air 20.0 mrad 0.00 whole body 5.0 mrem 1.57 skin 15.0 mrem 0.00 organ 15.0 mrem 2.52 (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: 99.7%

E-1.12 Page 117 of 206

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APPENDIX F METEOROLOGICAL DATA Page 119 of 206

Intentionally left blank Page 120 of 206

Byron Generating Station Period of Record: January - March 2014 Stability Class - Extremely Unstable - 250Ft-30Ft Delta-T (F)

Winds Measured at 30 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 0 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 1 1 0 0 2 S 0 0 1 4 0 0 5 SSW 0 0 3 0 0 0 3 SW 0 1 0 0 0 0 1 WSW 0 0 2 0 0 0 2 W 0 0 2 0 0 0 2 WNW 0 0 1 0 0 0 1 NW 0 0 1 1 0 0 2 NNW 0 0 0 0 0 0 0 Variable 0 0 0 0 0 0 0 Total 0 1 11 6 0 0 18 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: 2 F-1 Page 121 of 206

Byron Generating Station Period of Record: January - March 2014 Stability Class - Moderately Unstable - 250Ft-30Ft Delta-T (F)

Winds Measured at 30 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 0 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 1 0 0 1 SSE 0 0 0 0 1 0 1 S 0 0 0 0 0 0 0 SSW 0 0 0 0 0 0 0 SW 0 0 0 0 0 0 0 WSW 0 0 0 1 0 0 1 W 0 0 0 0 0 0 0 WNW 0 0 3 0 0 0 3 NW 0 0 0 2 0 0 2 NNW 0 0 0 0 0 0 0 Variable 0 0 0 0 0 0 0 Total 0 0 3 4 1 0 8 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 2 F-2 Page 122 of 206

Byron Generating Station Period of Record: January - March 2014 Stability Class - Slightly Unstable - 250Ft-30Ft Delta-T (F)

Winds Measured at 30 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 0 0 0 0 0 NNE 0 0 0 0 0 0 0 NE 0 0 0 3 0 0 3 ENE 0 0 0 1 0 0 1 E 0 0 0 0 0 0 0 ESE 0 0 0 0 0 0 0 SE 0 0 0 1 0 0 1 SSE 0 0 0 3 1 0 4 S 0 0 1 6 0 0 7 SSW 0 0 0 0 0 0 0 SW 0 0 0 0 0 0 0 WSW 0 0 2 1 0 0 3 W 0 0 0 0 0 0 0 WNW 0 0 0 1 0 0 1 NW 0 0 2 3 0 0 5 NNW 0 0 1 1 0 0 2 Variable 0 0 0 0 0 0 0 Total 0 0 6 20 1 0 27 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 2 F-3 Page 123 of 206

Byron Generating Station Period of Record: January - March 2014 Stability Class - Neutral - 250Ft-30Ft Delta-T (F)

Winds Measured at 30 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 2 10 54 59 1 0 126 NNE 0 10 33 9 0 0 52 NE 1 17 12 8 2 0 40 ENE 3 9 24 5 0 0 41 E 1 2 8 0 0 0 11 ESE 1 0 7 5 1 0 14 SE 1 7 24 14 1 0 47 SSE 0 25 32 28 10 2 97 S 0 24 30 29 14 0 97 SSW 0 12 11 22 11 1 57 SW 0 8 23 33 4 0 68 WSW 3 9 31 13 2 13 71 W 2 21 69 62 12 3 169 WNW 2 46 80 86 11 0 225 NW 6 37 62 33 4 0 142 NNW 4 15 55 10 1 0 85 Variable 0 0 0 0 0 0 0 Total 26 252 555 416 74 19 1342 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 1 Hours of missing stability measurements in all stability classes: 2 F-4 Page 124 of 206

Byron Generating Station Period of Record: January - March 2014 Stability Class - Slightly Stable - 250Ft-30Ft Delta-T (F)

Winds Measured at 30 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 2 7 0 0 0 0 9 NNE 1 4 4 1 0 0 10 NE 2 2 1 0 0 0 5 ENE 2 5 3 1 0 0 11 E 9 6 4 0 0 0 19 ESE 2 15 11 2 2 0 32 SE 1 9 13 1 1 0 25 SSE 3 11 18 10 3 0 45 S 3 12 16 23 3 0 57 SSW 6 7 8 15 0 0 36 SW 3 15 14 8 0 0 40 WSW 4 22 35 5 0 6 72 W 5 33 34 6 0 1 79 WNW 9 25 15 2 1 0 52 NW 5 37 7 2 0 0 51 NNW 2 13 2 0 0 0 17 Variable 1 0 0 0 0 0 1 Total 60 223 185 76 10 7 561 Hours of calm in this stability class: 4 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 2 F-5 Page 125 of 206

Byron Generating Station Period of Record: January - March 2014 Stability Class - Moderately Stable - 250Ft-30Ft Delta-T (F)

Winds Measured at 30 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 4 1 0 0 0 0 5 NNE 1 1 0 0 0 0 2 NE 1 0 1 0 0 0 2 ENE 0 0 3 0 0 0 3 E 4 9 0 0 0 0 13 ESE 1 12 3 0 0 0 16 SE 0 5 1 0 0 0 6 SSE 6 8 11 2 0 0 27 S 4 3 5 0 0 0 12 SSW 2 3 0 0 0 0 5 SW 1 1 0 0 0 0 2 WSW 2 0 0 0 0 0 2 W 7 9 0 0 0 0 16 WNW 7 5 0 0 0 0 12 NW 5 5 0 0 0 0 10 NNW 0 3 0 0 0 0 3 Variable 0 0 0 0 0 0 0 Total 45 65 24 2 0 0 136 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: 2 F-6 Page 126 of 206

Byron Generating Station Period of Record: January - March 2014 Stability Class - Extremely Stable - 250Ft-30Ft Delta-T (F)

Winds Measured at 30 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 1 0 0 0 0 0 1 NNE 2 0 0 0 0 0 2 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 6 0 0 0 0 6 SE 1 0 1 0 0 0 2 SSE 0 2 3 0 0 0 5 S 2 2 4 0 0 0 8 SSW 0 1 0 0 0 0 1 SW 4 0 0 0 0 0 4 WSW 3 0 0 0 0 0 3 W 3 0 0 0 0 0 3 WNW 4 0 0 0 0 0 4 NW 8 1 0 0 0 0 9 NNW 3 1 0 0 0 0 4 Variable 0 0 0 0 0 0 0 Total 32 13 8 0 0 0 53 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: 2 F-7 Page 127 of 206

Byron Generating Station Period of Record: January - March 2014 Stability Class - Extremely Unstable - 250Ft-30Ft Delta-T (F)

Winds Measured at 250 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 0 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 1 0 1 S 0 0 0 0 3 2 5 SSW 0 0 0 3 1 0 4 SW 0 0 1 0 0 0 1 WSW 0 0 0 2 0 0 2 W 0 0 0 1 0 0 1 WNW 0 0 0 2 0 0 2 NW 0 0 0 0 2 0 2 NNW 0 0 0 0 0 0 0 Variable 0 0 0 0 0 0 0 Total 0 0 1 8 7 2 18 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: 2 F-8 Page 128 of 206

Byron Generating Station Period of Record: January - March 2014 Stability Class - Moderately Unstable - 250Ft-30Ft Delta-T (F)

Winds Measured at 250 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 0 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 2 2 S 0 0 0 0 0 0 0 SSW 0 0 0 0 0 0 0 SW 0 0 0 0 0 0 0 WSW 0 0 0 0 1 0 1 W 0 0 0 0 0 0 0 WNW 0 0 0 3 0 0 3 NW 0 0 0 0 2 0 2 NNW 0 0 0 0 0 0 0 Variable 0 0 0 0 0 0 0 Total 0 0 0 3 3 2 8 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 2 F-9 Page 129 of 206

Byron Generating Station Period of Record: January - March 2014 Stability Class - Slightly Unstable - 250Ft-30Ft Delta-T (F)

Winds Measured at 250 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 0 0 0 0 0 NNE 0 0 0 0 0 0 0 NE 0 0 0 2 1 0 3 ENE 0 0 0 1 0 0 1 E 0 0 0 0 0 0 0 ESE 0 0 0 0 0 0 0 SE 0 0 0 0 1 0 1 SSE 0 0 0 0 1 2 3 S 0 0 0 6 0 2 8 SSW 0 0 0 0 0 0 0 SW 0 0 0 0 0 0 0 WSW 0 0 0 2 1 0 3 W 0 0 0 0 0 0 0 WNW 0 0 0 0 1 0 1 NW 0 0 2 0 3 0 5 NNW 0 0 1 0 0 1 2 Variable 0 0 0 0 0 0 0 Total 0 0 3 11 8 5 27 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 2 F-10 Page 130 of 206

Byron Generating Station Period of Record: January - March 2014 Stability Class - Neutral - 250Ft-30Ft Delta-T (F)

Winds Measured at 250 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 1 7 25 46 41 2 122 NNE 0 5 10 36 23 0 74 NE 1 9 11 17 6 3 47 ENE 1 4 7 18 3 0 33 E 0 2 2 14 1 0 19 ESE 1 0 1 3 2 1 8 SE 0 5 8 11 11 5 40 SSE 0 4 24 21 19 9 77 S 0 7 43 20 15 32 117 SSW 0 6 9 15 14 17 61 SW 0 3 12 21 21 18 75 WSW 3 7 10 26 7 16 69 W 0 17 20 69 33 18 157 WNW 2 15 43 71 61 22 214 NW 1 14 40 44 42 14 155 NNW 1 3 24 39 5 2 74 Variable 0 0 0 0 0 0 0 Total 11 108 289 471 304 159 1342 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 1 Hours of missing stability measurements in all stability classes: 2 F-11 Page 131 of 206

Byron Generating Station Period of Record: January - March 2014 Stability Class - Slightly Stable - 250Ft-30Ft Delta-T (F)

Winds Measured at 250 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 1 4 4 0 0 9 NNE 1 1 4 1 1 0 8 NE 0 0 4 0 1 0 5 ENE 1 5 5 0 3 0 14 E 1 8 2 2 1 2 16 ESE 0 3 2 7 6 2 20 SE 1 4 3 8 1 3 20 SSE 1 1 6 12 11 3 34 S 2 3 5 13 16 27 66 SSW 2 2 10 4 14 10 42 SW 1 3 6 14 9 9 42 WSW 1 2 8 54 5 5 75 W 1 3 14 40 9 2 69 WNW 0 4 17 23 3 0 47 NW 0 8 23 31 5 3 70 NNW 2 0 14 9 1 0 26 Variable 0 0 0 0 0 0 0 Total 14 48 127 222 86 66 563 Hours of calm in this stability class: 2 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 2 F-12 Page 132 of 206

Byron Generating Station Period of Record: January - March 2014 Stability Class - Moderately Stable - 250Ft-30Ft Delta-T (F)

Winds Measured at 250 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 3 5 3 0 0 11 NNE 0 1 1 2 0 0 4 NE 1 2 1 2 0 0 6 ENE 0 1 0 0 0 0 1 E 0 2 5 4 2 0 13 ESE 0 1 2 4 5 0 12 SE 0 1 0 5 2 0 8 SSE 0 0 2 4 8 1 15 S 0 1 1 5 8 1 16 SSW 0 0 4 1 2 1 8 SW 0 0 1 0 0 0 1 WSW 1 1 3 0 0 0 5 W 0 1 3 3 0 0 7 WNW 0 0 4 4 0 0 8 NW 0 0 4 9 0 0 13 NNW 0 1 4 3 0 0 8 Variable 0 0 0 0 0 0 0 Total 2 15 40 49 27 3 136 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: 2 F-13 Page 133 of 206

Byron Generating Station Period of Record: January - March 2014 Stability Class - Extremely Stable - 250Ft-30Ft Delta-T (F)

Winds Measured at 250 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 3 7 4 2 0 16 NNE 0 1 2 2 0 0 5 NE 0 0 1 1 0 0 2 ENE 0 1 0 0 0 0 1 E 1 1 0 0 0 0 2 ESE 0 0 0 2 0 0 2 SE 1 1 1 3 1 0 7 SSE 0 0 0 0 0 0 0 S 0 1 0 1 4 0 6 SSW 0 1 3 0 4 0 8 SW 0 1 1 0 0 0 2 WSW 0 1 1 0 0 0 2 W 0 0 0 0 0 0 0 WNW 1 0 0 0 0 0 1 NW 0 2 1 0 0 0 3 NNW 0 1 0 3 0 0 4 Variable 0 0 0 0 0 0 0 Total 3 14 17 16 11 0 61 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 2 F-14 Page 134 of 206

Byron Generating Station Period of Record: April - June 2014 Stability Class - Extremely Unstable - 250Ft-30Ft Delta-T (F)

Winds Measured at 30 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 0 0 0 0 0 NNE 0 1 5 0 0 0 6 NE 0 1 1 0 0 0 2 ENE 0 1 6 0 0 0 7 E 0 9 2 0 0 0 11 ESE 0 2 0 0 0 0 2 SE 0 0 0 0 0 0 0 SSE 0 1 0 0 0 0 1 S 0 2 2 0 0 0 4 SSW 0 1 1 0 0 0 2 SW 0 0 1 1 0 0 2 WSW 0 1 3 1 0 0 5 W 0 0 2 0 0 0 2 WNW 0 0 1 0 0 0 1 NW 0 0 0 0 0 0 0 NNW 0 0 1 0 0 0 1 Variable 0 0 0 0 0 0 0 Total 0 19 25 2 0 0 46 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-15 Page 135 of 206

Byron Generating Station Period of Record: April - June 2014 Stability Class - Moderately Unstable - 250Ft-30Ft Delta-T (F)

Winds Measured at 30 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 0 0 0 0 0 NNE 0 0 1 0 0 0 1 NE 0 0 0 0 0 0 0 ENE 0 0 0 0 0 0 0 E 0 0 3 1 0 0 4 ESE 0 0 0 0 0 0 0 SE 0 1 0 0 0 0 1 SSE 0 0 0 0 1 0 1 S 0 1 1 0 0 0 2 SSW 0 0 0 0 0 0 0 SW 1 0 3 1 0 0 5 WSW 0 0 1 0 2 0 3 W 0 0 1 0 4 0 5 WNW 0 0 1 0 0 0 1 NW 0 0 1 0 0 0 1 NNW 0 0 0 0 0 0 0 Variable 0 0 0 0 0 0 0 Total 1 2 12 2 7 0 24 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 5 F-16 Page 136 of 206

Byron Generating Station Period of Record: April - June 2014 Stability Class - Slightly Unstable - 250Ft-30Ft Delta-T (F)

Winds Measured at 30 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 1 0 0 0 1 NNE 0 0 1 0 0 0 1 NE 0 0 3 0 0 0 3 ENE 0 1 3 2 0 0 6 E 0 1 5 2 0 0 8 ESE 0 2 2 0 0 0 4 SE 0 0 2 0 0 0 2 SSE 0 1 0 5 4 0 10 S 0 0 6 4 1 0 11 SSW 0 4 8 3 2 0 17 SW 0 3 5 0 0 0 8 WSW 0 0 3 1 1 0 5 W 0 1 5 3 4 0 13 WNW 0 2 0 0 0 0 2 NW 0 0 4 1 0 0 5 NNW 0 0 0 0 1 0 1 Variable 0 0 0 0 0 0 0 Total 0 15 48 21 13 0 97 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 Page 137 of 206

Byron Generating Station Period of Record: April - June 2014 Stability Class - Neutral - 250Ft-30Ft Delta-T (F)

Winds Measured at 30 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 4 24 22 4 1 0 55 NNE 1 12 23 0 0 0 36 NE 1 10 26 2 0 0 39 ENE 2 14 35 37 1 0 89 E 0 41 59 21 0 0 121 ESE 1 21 20 8 0 0 50 SE 0 9 20 3 0 0 32 SSE 0 10 37 21 10 1 79 S 0 15 38 16 1 0 70 SSW 4 20 43 19 2 0 88 SW 1 31 42 4 0 0 78 WSW 4 9 33 13 3 3 65 W 1 18 48 28 6 2 103 WNW 5 19 31 16 7 0 78 NW 3 21 27 6 0 0 57 NNW 1 21 35 14 1 0 72 Variable 0 0 0 0 0 0 0 Total 28 295 539 212 32 6 1112 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 5 F-18 Page 138 of 206

Byron Generating Station Period of Record: April - June 2014 Stability Class - Slightly Stable - 250Ft-30Ft Delta-T (F)

Winds Measured at 30 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 1 10 6 0 0 0 17 NNE 2 5 4 0 0 0 11 NE 2 9 5 1 0 0 17 ENE 3 15 18 8 0 0 44 E 5 42 20 2 0 0 69 ESE 1 16 15 5 1 0 38 SE 4 20 22 2 0 0 48 SSE 3 21 41 26 0 0 91 S 7 26 41 10 0 0 84 SSW 3 23 18 5 2 0 51 SW 8 15 5 1 1 0 30 WSW 12 5 4 1 0 0 22 W 10 10 11 0 0 0 31 WNW 10 19 13 0 0 0 42 NW 12 25 5 0 0 0 42 NNW 5 25 10 1 0 0 41 Variable 0 0 0 0 0 0 0 Total 88 286 238 62 4 0 678 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 5 F-19 Page 139 of 206

Byron Generating Station Period of Record: April - June 2014 Stability Class - Moderately Stable - 250Ft-30Ft Delta-T (F)

Winds Measured at 30 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 3 1 0 0 0 0 4 NNE 4 3 0 0 0 0 7 NE 3 1 0 0 0 0 4 ENE 4 0 0 0 0 0 4 E 3 11 1 0 0 0 15 ESE 4 8 4 0 0 0 16 SE 1 17 3 0 0 0 21 SSE 4 18 14 0 0 0 36 S 7 7 2 0 0 0 16 SSW 2 4 0 0 0 0 6 SW 5 4 0 0 0 0 9 WSW 4 1 0 0 0 0 5 W 3 2 0 0 0 0 5 WNW 4 2 0 0 0 0 6 NW 6 4 0 0 0 0 10 NNW 4 4 0 0 0 0 8 Variable 0 0 0 0 0 0 0 Total 61 87 24 0 0 0 172 Hours of calm in this stability class: 5 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 5 F-20 Page 140 of 206

Byron Generating Station Period of Record: April - June 2014 Stability Class - Extremely Stable - 250Ft-30Ft Delta-T (F)

Winds Measured at 30 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 0 0 0 0 0 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 1 0 0 0 0 0 1 ESE 3 3 2 0 0 0 8 SE 0 4 0 0 0 0 4 SSE 2 1 2 0 0 0 5 S 2 3 0 0 0 0 5 SSW 1 0 0 0 0 0 1 SW 2 0 0 0 0 0 2 WSW 1 0 0 0 0 0 1 W 5 0 0 0 0 0 5 WNW 4 0 0 0 0 0 4 NW 3 0 0 0 0 0 3 NNW 1 0 0 0 0 0 1 Variable 0 0 0 0 0 0 0 Total 26 11 4 0 0 0 41 Hours of calm in this stability class: 4 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 5 F-21 Page 141 of 206

Byron Generating Station Period of Record: April - June 2014 Stability Class - Extremely Unstable - 250Ft-30Ft Delta-T (F)

Winds Measured at 250 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 0 1 0 0 1 NNE 0 0 0 5 0 0 5 NE 0 0 0 1 0 0 1 ENE 0 1 4 3 0 0 8 E 0 6 3 2 0 0 11 ESE 0 0 3 0 0 0 3 SE 0 0 0 0 0 0 0 SSE 0 0 0 0 0 0 0 S 0 0 2 0 2 0 4 SSW 0 1 1 1 0 0 3 SW 0 0 0 0 1 0 1 WSW 0 0 2 3 0 0 5 W 0 0 2 1 0 0 3 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 8 17 18 3 0 46 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 Page 142 of 206

Byron Generating Station Period of Record: April - June 2014 Stability Class - Moderately Unstable - 250Ft-30Ft Delta-T (F)

Winds Measured at 250 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 0 0 0 0 0 NNE 0 0 0 1 0 0 1 NE 0 0 0 0 0 0 0 ENE 0 0 0 0 0 0 0 E 0 0 1 1 1 0 3 ESE 0 0 0 0 1 0 1 SE 0 0 0 1 0 0 1 SSE 0 0 0 0 0 1 1 S 0 0 0 1 0 0 1 SSW 0 1 0 0 0 0 1 SW 0 0 0 4 0 0 4 WSW 0 1 0 1 0 1 3 W 0 0 1 0 2 3 6 WNW 0 0 1 0 0 0 1 NW 0 0 1 0 0 0 1 NNW 0 0 0 0 0 0 0 Variable 0 0 0 0 0 0 0 Total 0 2 4 9 4 5 24 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 5 F-23 Page 143 of 206

Byron Generating Station Period of Record: April - June 2014 Stability Class - Slightly Unstable - 250Ft-30Ft Delta-T (F)

Winds Measured at 250 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 0 0 0 0 0 NNE 0 0 0 1 0 0 1 NE 0 0 2 2 0 0 4 ENE 0 0 2 2 0 0 4 E 0 0 4 3 2 0 9 ESE 0 0 5 1 0 0 6 SE 0 0 0 2 0 0 2 SSE 0 0 0 3 4 4 11 S 0 0 1 5 1 1 8 SSW 0 0 7 8 0 2 17 SW 0 1 4 3 1 0 9 WSW 0 0 0 3 1 0 4 W 0 0 4 4 4 2 14 WNW 0 0 1 0 0 0 1 NW 0 0 2 3 0 0 5 NNW 0 0 0 1 0 1 2 Variable 0 0 0 0 0 0 0 Total 0 1 32 41 13 10 97 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 Page 144 of 206

Byron Generating Station Period of Record: April - June 2014 Stability Class - Neutral - 250Ft-30Ft Delta-T (F)

Winds Measured at 250 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 1 12 27 9 7 1 57 NNE 0 6 11 16 2 0 35 NE 0 4 13 16 9 0 42 ENE 0 5 20 12 31 4 72 E 0 18 38 47 37 4 144 ESE 1 7 21 15 7 0 51 SE 0 3 12 10 3 2 30 SSE 0 2 11 26 23 15 77 S 0 5 19 21 17 1 63 SSW 2 8 27 33 22 3 95 SW 1 6 31 36 4 0 78 WSW 0 10 18 17 9 4 58 W 3 7 32 42 17 8 109 WNW 0 10 14 23 10 10 67 NW 0 6 29 21 7 0 63 NNW 1 15 12 32 10 1 71 Variable 0 0 0 0 0 0 0 Total 9 124 335 376 215 53 1112 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 Page 145 of 206

Byron Generating Station Period of Record: April - June 2014 Stability Class - Slightly Stable - 250Ft-30Ft Delta-T (F)

Winds Measured at 250 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 1 5 12 12 1 0 31 NNE 0 2 5 4 1 0 12 NE 0 0 9 3 2 0 14 ENE 1 7 6 17 7 2 40 E 0 8 30 24 8 3 73 ESE 0 2 8 14 7 6 37 SE 1 0 6 15 9 2 33 SSE 0 2 9 22 34 20 87 S 1 3 7 30 32 2 75 SSW 0 2 23 26 13 10 74 SW 0 3 6 9 5 1 24 WSW 0 6 12 8 2 0 28 W 0 6 10 5 4 0 25 WNW 0 2 14 24 0 0 40 NW 1 3 15 20 2 1 42 NNW 0 8 10 24 1 0 43 Variable 0 0 0 0 0 0 0 Total 5 59 182 257 128 47 678 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 Page 146 of 206

Byron Generating Station Period of Record: April - June 2014 Stability Class - Moderately Stable - 250Ft-30Ft Delta-T (F)

Winds Measured at 250 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 2 4 0 0 0 6 NNE 1 1 3 1 0 0 6 NE 1 4 1 1 0 0 7 ENE 2 0 2 0 0 0 4 E 1 1 5 1 3 0 11 ESE 1 4 6 5 3 0 19 SE 1 2 3 7 3 0 16 SSE 0 2 3 12 5 1 23 S 0 2 0 10 9 0 21 SSW 0 1 1 10 1 0 13 SW 0 0 2 6 0 0 8 WSW 0 0 2 6 0 0 8 W 1 1 1 1 0 0 4 WNW 0 1 4 2 1 0 8 NW 1 3 6 2 0 0 12 NNW 0 3 6 2 0 0 11 Variable 0 0 0 0 0 0 0 Total 9 27 49 66 25 1 177 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 5 F-27 Page 147 of 206

Byron Generating Station Period of Record: April - June 2014 Stability Class - Extremely Stable - 250Ft-30Ft Delta-T (F)

Winds Measured at 250 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 1 1 0 0 0 2 NNE 0 0 0 0 0 0 0 NE 0 1 1 0 0 0 2 ENE 2 0 0 0 0 0 2 E 1 0 0 0 0 0 1 ESE 1 1 2 0 0 0 4 SE 0 0 1 3 1 0 5 SSE 0 0 0 1 1 0 2 S 0 0 2 2 1 0 5 SSW 0 0 4 1 0 0 5 SW 0 1 1 0 0 0 2 WSW 0 0 0 1 0 0 1 W 0 2 0 0 0 0 2 WNW 0 1 0 0 0 0 1 NW 0 2 2 3 0 0 7 NNW 1 2 1 0 0 0 4 Variable 0 0 0 0 0 0 0 Total 5 11 15 11 3 0 45 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 Page 148 of 206

Byron Generating Station Period of Record: July - September 2014 Stability Class - Extremely Unstable - 250Ft-30Ft Delta-T (F)

Winds Measured at 30 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 1 1 0 0 0 0 2 NNE 0 2 0 0 0 0 2 NE 0 4 0 0 0 0 4 ENE 0 4 0 0 0 0 4 E 2 2 0 0 0 0 4 ESE 2 1 0 0 0 0 3 SE 3 0 0 0 0 0 3 SSE 2 4 0 0 0 0 6 S 0 5 0 2 0 0 7 SSW 0 1 0 0 0 0 1 SW 0 4 1 0 0 0 5 WSW 0 1 2 0 0 0 3 W 0 2 0 0 0 0 2 WNW 0 2 0 0 0 0 2 NW 0 1 0 0 0 0 1 NNW 1 0 0 0 0 0 1 Variable 0 0 0 0 0 0 0 Total 11 34 3 2 0 0 50 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 3 F-29 Page 149 of 206

Byron Generating Station Period of Record: July - September 2014 Stability Class - Moderately Unstable - 250Ft-30Ft Delta-T (F)

Winds Measured at 30 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 1 1 3 0 0 0 5 NNE 0 0 0 0 0 0 0 NE 0 0 0 0 0 0 0 ENE 0 0 0 0 0 0 0 E 0 4 1 0 0 0 5 ESE 0 0 1 0 0 0 1 SE 0 3 0 0 0 0 3 SSE 0 2 1 0 0 0 3 S 0 4 4 1 0 0 9 SSW 0 8 1 0 0 0 9 SW 0 8 2 0 0 0 10 WSW 0 4 6 0 0 0 10 W 0 1 2 0 0 0 3 WNW 0 2 1 0 0 0 3 NW 0 2 1 0 0 0 3 NNW 0 5 0 0 0 0 5 Variable 0 0 0 0 0 0 0 Total 1 44 23 1 0 0 69 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 3 F-30 Page 150 of 206

Byron Generating Station Period of Record: July - September 2014 Stability Class - Slightly Unstable - 250Ft-30Ft Delta-T (F)

Winds Measured at 30 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 1 2 3 0 0 0 6 NNE 0 0 1 0 0 0 1 NE 0 1 0 0 0 0 1 ENE 0 3 0 0 0 0 3 E 0 4 1 0 0 0 5 ESE 0 4 1 0 0 0 5 SE 0 4 4 1 0 0 9 SSE 0 4 2 0 0 0 6 S 0 8 9 0 0 0 17 SSW 0 11 2 0 0 0 13 SW 0 7 2 0 0 0 9 WSW 0 9 5 0 0 0 14 W 0 6 5 0 0 0 11 WNW 0 2 4 0 0 0 6 NW 0 6 2 0 0 0 8 NNW 0 6 1 1 0 0 8 Variable 0 0 0 0 0 0 0 Total 1 77 42 2 0 0 122 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 Page 151 of 206

Byron Generating Station Period of Record: July - September 2014 Stability Class - Neutral - 250Ft-30Ft Delta-T (F)

Winds Measured at 30 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 4 19 22 2 0 0 47 NNE 2 13 12 0 0 0 27 NE 4 12 12 0 0 0 28 ENE 9 15 3 0 0 0 27 E 6 24 5 0 0 0 35 ESE 2 5 10 0 0 0 17 SE 4 10 7 2 0 0 23 SSE 5 32 10 0 0 0 47 S 9 48 34 6 0 0 97 SSW 6 22 25 0 0 0 53 SW 4 29 24 0 0 0 57 WSW 5 22 17 9 0 0 53 W 9 31 17 6 0 0 63 WNW 6 26 35 8 0 0 75 NW 9 40 37 3 0 0 89 NNW 5 30 29 3 0 0 67 Variable 0 0 0 0 0 0 0 Total 89 378 299 39 0 0 805 Hours of calm in this stability class: 2 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 3 F-32 Page 152 of 206

Byron Generating Station Period of Record: July - September 2014 Stability Class - Slightly Stable - 250Ft-30Ft Delta-T (F)

Winds Measured at 30 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 8 3 6 0 0 0 17 NNE 7 6 1 0 0 0 14 NE 10 5 0 0 0 0 15 ENE 10 23 5 0 0 0 38 E 8 26 0 0 0 0 34 ESE 4 17 2 0 0 0 23 SE 7 23 2 1 0 0 33 SSE 8 43 13 1 0 0 65 S 8 38 28 0 0 0 74 SSW 9 7 14 0 0 0 30 SW 10 11 9 0 0 0 30 WSW 11 8 5 0 0 0 24 W 12 18 8 0 0 0 38 WNW 8 19 8 0 0 0 35 NW 16 18 2 0 0 0 36 NNW 7 25 7 0 0 0 39 Variable 0 0 0 0 0 0 0 Total 143 290 110 2 0 0 545 Hours of calm in this stability class: 3 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 3 F-33 Page 153 of 206

Byron Generating Station Period of Record: July - September 2014 Stability Class - Moderately Stable - 250Ft-30Ft Delta-T (F)

Winds Measured at 30 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 5 7 0 0 0 0 12 NNE 5 4 0 0 0 0 9 NE 0 2 0 0 0 0 2 ENE 2 8 1 0 0 0 11 E 5 30 0 0 0 0 35 ESE 6 29 0 0 0 0 35 SE 9 25 0 0 0 0 34 SSE 11 40 6 0 0 0 57 S 17 14 0 0 0 0 31 SSW 16 7 0 0 0 0 23 SW 10 1 0 0 0 0 11 WSW 10 0 0 0 0 0 10 W 12 4 0 0 0 0 16 WNW 17 3 0 0 0 0 20 NW 23 2 0 0 0 0 25 NNW 10 4 0 0 0 0 14 Variable 0 0 0 0 0 0 0 Total 158 180 7 0 0 0 345 Hours of calm in this stability class: 3 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 3 F-34 Page 154 of 206

Byron Generating Station Period of Record: July - September 2014 Stability Class - Extremely Stable - 250Ft-30Ft Delta-T (F)

Winds Measured at 30 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 0 0 0 0 0 NNE 2 0 0 0 0 0 2 NE 1 0 0 0 0 0 1 ENE 1 0 0 0 0 0 1 E 9 6 0 0 0 0 15 ESE 12 28 0 0 0 0 40 SE 11 17 0 0 0 0 28 SSE 20 18 0 0 0 0 38 S 38 11 0 0 0 0 49 SSW 23 6 0 0 0 0 29 SW 14 0 0 0 0 0 14 WSW 11 0 0 0 0 0 11 W 7 1 0 0 0 0 8 WNW 12 0 0 0 0 0 12 NW 9 1 0 0 0 0 10 NNW 1 0 0 0 0 0 1 Variable 0 0 0 0 0 0 0 Total 171 88 0 0 0 0 259 Hours of calm in this stability class: 2 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 3 F-35 Page 155 of 206

Byron Generating Station Period of Record: July - September 2014 Stability Class - Extremely Unstable - 250Ft-30Ft Delta-T (F)

Winds Measured at 250 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 1 0 0 0 0 1 NNE 0 1 0 0 0 0 1 NE 0 0 3 0 0 0 3 ENE 0 3 3 0 0 0 6 E 0 2 2 0 0 0 4 ESE 1 2 0 0 0 0 3 SE 0 3 0 0 0 0 3 SSE 0 2 1 1 0 0 4 S 0 1 4 1 2 0 8 SSW 0 0 2 0 0 0 2 SW 0 0 4 1 0 0 5 WSW 0 0 1 2 0 0 3 W 0 0 2 0 0 0 2 WNW 0 0 2 0 0 0 2 NW 0 0 1 0 0 0 1 NNW 0 2 0 0 0 0 2 Variable 0 0 0 0 0 0 0 Total 1 17 25 5 2 0 50 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 3 F-36 Page 156 of 206

Byron Generating Station Period of Record: July - September 2014 Stability Class - Moderately Unstable - 250Ft-30Ft Delta-T (F)

Winds Measured at 250 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 4 2 1 0 0 7 NNE 0 0 0 1 0 0 1 NE 0 0 0 0 0 0 0 ENE 0 0 0 0 0 0 0 E 0 2 2 1 0 0 5 ESE 0 0 1 0 0 0 1 SE 0 1 2 0 0 0 3 SSE 0 1 1 1 0 0 3 S 0 1 3 2 1 0 7 SSW 0 2 8 0 0 0 10 SW 0 3 6 2 0 0 11 WSW 0 0 3 4 1 0 8 W 0 2 2 1 0 0 5 WNW 0 0 2 0 1 0 3 NW 0 0 1 2 0 0 3 NNW 0 1 1 0 0 0 2 Variable 0 0 0 0 0 0 0 Total 0 17 34 15 3 0 69 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 Page 157 of 206

Byron Generating Station Period of Record: July - September 2014 Stability Class - Slightly Unstable - 250Ft-30Ft Delta-T (F)

Winds Measured at 250 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 3 3 2 0 0 8 NNE 0 0 0 1 0 0 1 NE 0 1 0 0 0 0 1 ENE 0 2 0 0 0 0 2 E 0 2 3 1 0 0 6 ESE 0 1 2 2 1 0 6 SE 0 3 3 2 0 1 9 SSE 0 1 3 0 0 0 4 S 0 3 6 8 1 0 18 SSW 0 2 9 2 0 0 13 SW 0 2 4 3 1 0 10 WSW 0 4 5 3 1 0 13 W 0 4 4 2 0 0 10 WNW 0 1 4 2 0 0 7 NW 0 0 6 2 0 0 8 NNW 0 2 2 1 1 0 6 Variable 0 0 0 0 0 0 0 Total 0 31 54 31 5 1 122 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 Page 158 of 206

Byron Generating Station Period of Record: July - September 2014 Stability Class - Neutral - 250Ft-30Ft Delta-T (F)

Winds Measured at 250 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 3 9 20 15 2 1 50 NNE 1 4 10 14 1 0 30 NE 0 8 5 8 1 0 22 ENE 4 11 13 3 0 0 31 E 3 12 17 5 1 0 38 ESE 1 2 3 8 3 0 17 SE 5 10 3 4 2 2 26 SSE 2 16 15 7 2 0 42 S 2 19 32 36 2 4 95 SSW 2 15 21 19 2 0 59 SW 4 11 19 16 6 0 56 WSW 1 13 8 18 9 0 49 W 3 21 24 16 3 0 67 WNW 5 9 27 20 13 4 78 NW 3 14 24 26 13 2 82 NNW 2 12 21 23 7 0 65 Variable 0 0 0 0 0 0 0 Total 41 186 262 238 67 13 807 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 3 F-39 Page 159 of 206

Byron Generating Station Period of Record: July - September 2014 Stability Class - Slightly Stable - 250Ft-30Ft Delta-T (F)

Winds Measured at 250 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 2 5 4 7 0 0 18 NNE 0 5 4 7 0 0 16 NE 2 5 7 2 0 0 16 ENE 1 14 9 8 2 0 34 E 2 10 18 11 0 0 41 ESE 2 0 7 14 2 0 25 SE 0 2 7 8 1 1 19 SSE 0 8 15 23 15 2 63 S 1 2 13 34 18 0 68 SSW 1 3 12 20 8 0 44 SW 2 5 6 10 7 0 30 WSW 0 7 13 6 0 0 26 W 1 7 11 11 4 0 34 WNW 1 3 13 15 2 0 34 NW 0 4 23 12 1 0 40 NNW 1 4 19 16 0 0 40 Variable 0 0 0 0 0 0 0 Total 16 84 181 204 60 3 548 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 Page 160 of 206

Byron Generating Station Period of Record: July - September 2014 Stability Class - Moderately Stable - 250Ft-30Ft Delta-T (F)

Winds Measured at 250 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 1 2 2 6 0 0 11 NNE 0 1 5 3 0 0 9 NE 1 4 5 1 0 0 11 ENE 0 3 1 1 0 0 5 E 1 4 15 19 2 0 41 ESE 0 2 3 9 5 0 19 SE 0 2 5 7 9 0 23 SSE 2 1 11 10 13 0 37 S 1 3 13 19 6 0 42 SSW 0 4 16 12 0 0 32 SW 1 1 9 3 0 0 14 WSW 0 3 13 2 0 0 18 W 1 3 10 4 0 0 18 WNW 0 2 15 3 0 0 20 NW 0 2 12 19 0 0 33 NNW 2 4 7 2 0 0 15 Variable 0 0 0 0 0 0 0 Total 10 41 142 120 35 0 348 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 Page 161 of 206

Byron Generating Station Period of Record: July - September 2014 Stability Class - Extremely Stable - 250Ft-30Ft Delta-T (F)

Winds Measured at 250 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 1 3 3 0 0 7 NNE 0 0 0 0 0 0 0 NE 1 2 1 0 0 0 4 ENE 0 0 0 0 0 0 0 E 0 1 1 0 1 0 3 ESE 0 2 1 4 14 0 21 SE 1 0 4 15 5 1 26 SSE 1 2 12 7 2 0 24 S 0 0 17 14 1 0 32 SSW 0 4 24 9 0 0 37 SW 1 3 16 10 0 0 30 WSW 0 4 17 1 0 0 22 W 1 3 13 0 0 0 17 WNW 1 3 4 3 0 0 11 NW 2 2 11 2 0 0 17 NNW 1 3 4 2 0 0 10 Variable 0 0 0 0 0 0 0 Total 9 30 128 70 23 1 261 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 Page 162 of 206

Byron Generating Station Period of Record: October - December 2014 Stability Class - Extremely Unstable - 250Ft-30Ft Delta-T (F)

Winds Measured at 30 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 2 0 0 0 0 2 NNE 1 3 0 0 0 0 4 NE 0 2 0 0 0 0 2 ENE 0 0 0 0 0 0 0 E 0 0 0 0 0 0 0 ESE 3 3 5 3 0 0 14 SE 0 2 4 0 0 0 6 SSE 1 4 1 0 0 0 6 S 4 5 1 1 0 0 11 SSW 0 3 3 2 0 0 8 SW 0 4 4 0 0 0 8 WSW 0 1 3 0 1 0 5 W 2 6 2 10 0 0 20 WNW 0 1 6 1 0 0 8 NW 1 1 1 2 0 0 5 NNW 2 0 2 0 0 0 4 Variable 0 0 0 0 0 0 0 Total 14 37 32 19 1 0 103 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: 98 F-43 Page 163 of 206

Byron Generating Station Period of Record: October - December 2014 Stability Class - Moderately Unstable - 250Ft-30Ft Delta-T (F)

Winds Measured at 30 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 1 1 0 0 0 2 NNE 0 1 1 0 0 0 2 NE 0 1 0 0 0 0 1 ENE 0 0 0 0 0 0 0 E 0 2 2 0 0 0 4 ESE 0 2 0 1 0 0 3 SE 0 3 5 0 0 0 8 SSE 0 1 2 0 0 0 3 S 0 3 0 3 0 0 6 SSW 0 3 4 1 0 0 8 SW 0 1 1 1 0 0 3 WSW 0 2 2 1 0 0 5 W 0 1 5 3 0 0 9 WNW 0 0 5 1 0 0 6 NW 1 0 3 0 0 0 4 NNW 0 4 2 0 0 0 6 Variable 0 0 0 0 0 0 0 Total 1 25 33 11 0 0 70 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 98 F-44 Page 164 of 206

Byron Generating Station Period of Record: October - December 2014 Stability Class - Slightly Unstable - 250Ft-30Ft Delta-T (F)

Winds Measured at 30 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 1 3 1 0 0 5 NNE 0 1 1 0 0 0 2 NE 0 1 0 0 0 0 1 ENE 0 1 0 0 0 0 1 E 0 0 0 0 0 0 0 ESE 0 2 1 1 0 0 4 SE 0 1 1 0 0 0 2 SSE 0 2 3 3 0 0 8 S 0 2 3 1 0 0 6 SSW 0 4 0 3 0 0 7 SW 0 4 0 1 0 0 5 WSW 1 3 4 0 0 0 8 W 0 2 0 4 1 0 7 WNW 0 2 7 5 0 0 14 NW 0 0 4 1 0 0 5 NNW 0 3 8 0 0 0 11 Variable 0 0 0 0 0 0 0 Total 1 29 35 20 1 0 86 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: 98 F-45 Page 165 of 206

Byron Generating Station Period of Record: October - December 2014 Stability Class - Neutral - 250Ft-30Ft Delta-T (F)

Winds Measured at 30 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 8 37 44 8 5 0 102 NNE 4 24 10 0 0 0 38 NE 3 8 1 0 0 0 12 ENE 1 3 2 0 0 0 6 E 6 10 2 0 0 0 18 ESE 7 9 6 4 0 0 26 SE 4 19 28 2 0 0 53 SSE 4 19 56 15 0 0 94 S 0 15 25 12 0 0 52 SSW 1 14 33 13 0 0 61 SW 7 15 19 7 0 0 48 WSW 2 12 28 7 4 0 53 W 6 18 74 58 12 0 168 WNW 6 30 96 32 0 0 164 NW 5 21 58 7 0 0 91 NNW 7 26 56 17 0 0 106 Variable 0 0 0 0 0 0 0 Total 71 280 538 182 21 0 1092 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: 98 F-46 Page 166 of 206

Byron Generating Station Period of Record: October - December 2014 Stability Class - Slightly Stable - 250Ft-30Ft Delta-T (F)

Winds Measured at 30 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 6 9 7 0 0 0 22 NNE 4 12 0 0 0 0 16 NE 3 4 0 0 0 0 7 ENE 1 5 1 0 0 0 7 E 1 11 1 0 0 0 13 ESE 2 11 5 0 0 0 18 SE 4 7 6 0 0 0 17 SSE 3 18 45 5 0 0 71 S 5 15 32 7 0 0 59 SSW 11 19 36 14 0 0 80 SW 18 30 14 0 0 0 62 WSW 4 28 17 1 1 0 51 W 11 22 18 1 0 0 52 WNW 9 20 7 0 0 0 36 NW 6 19 2 0 0 0 27 NNW 6 7 4 0 0 0 17 Variable 1 0 0 0 0 0 1 Total 95 237 195 28 1 0 556 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: 98 F-47 Page 167 of 206

Byron Generating Station Period of Record: October - December 2014 Stability Class - Moderately Stable - 250Ft-30Ft Delta-T (F)

Winds Measured at 30 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 6 0 0 0 0 6 NNE 3 4 0 0 0 0 7 NE 0 0 0 0 0 0 0 ENE 0 2 0 0 0 0 2 E 4 4 0 0 0 0 8 ESE 0 13 3 0 0 0 16 SE 0 16 0 0 0 0 16 SSE 5 16 2 0 0 0 23 S 7 7 0 0 0 0 14 SSW 4 4 1 0 0 0 9 SW 3 4 0 0 0 0 7 WSW 1 1 0 0 0 0 2 W 5 7 0 0 0 0 12 WNW 3 7 0 0 0 0 10 NW 5 3 0 0 0 0 8 NNW 1 3 0 0 0 0 4 Variable 0 0 0 0 0 0 0 Total 41 97 6 0 0 0 144 Hours of calm in this stability class: 3 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 98 F-48 Page 168 of 206

Byron Generating Station Period of Record: October - December 2014 Stability Class - Extremely Stable - 250Ft-30Ft Delta-T (F)

Winds Measured at 30 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 3 0 0 0 0 3 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 6 1 0 0 0 7 SE 1 7 0 0 0 0 8 SSE 2 1 0 0 0 0 3 S 4 4 0 0 0 0 8 SSW 4 0 0 0 0 0 4 SW 3 0 0 0 0 0 3 WSW 2 0 0 0 0 0 2 W 5 0 0 0 0 0 5 WNW 2 0 0 0 0 0 2 NW 2 0 0 0 0 0 2 NNW 4 0 0 0 0 0 4 Variable 0 0 0 0 0 0 0 Total 29 24 1 0 0 0 54 Hours of calm in this stability class: 2 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 98 F-49 Page 169 of 206

Byron Generating Station Period of Record: October - December 2014 Stability Class - Extremely Unstable - 250Ft-30Ft Delta-T (F)

Winds Measured at 250 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 1 0 0 0 1 NNE 0 2 3 0 0 0 5 NE 0 0 1 0 0 0 1 ENE 0 0 1 0 0 0 1 E 0 0 0 0 0 0 0 ESE 0 0 1 3 6 0 10 SE 1 1 3 3 1 0 9 SSE 1 3 2 1 0 0 7 S 0 4 3 0 1 0 8 SSW 0 3 1 4 2 0 10 SW 0 2 3 1 1 0 7 WSW 0 2 2 4 0 1 9 W 0 1 3 1 8 2 15 WNW 0 2 1 7 1 0 11 NW 0 2 0 1 1 1 5 NNW 0 2 0 1 1 0 4 Variable 0 0 0 0 0 0 0 Total 2 24 25 26 22 4 103 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: 98 F-50 Page 170 of 206

Byron Generating Station Period of Record: October - December 2014 Stability Class - Moderately Unstable - 250Ft-30Ft Delta-T (F)

Winds Measured at 250 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 1 1 0 0 2 NNE 0 0 0 1 0 0 1 NE 0 0 2 0 0 0 2 ENE 0 0 0 0 0 0 0 E 0 1 0 1 1 0 3 ESE 0 0 1 1 1 0 3 SE 0 1 2 4 1 0 8 SSE 0 2 1 0 1 0 4 S 0 0 2 1 3 0 6 SSW 0 1 2 3 2 0 8 SW 0 1 0 2 0 0 3 WSW 0 0 4 2 0 0 6 W 0 1 0 5 1 0 7 WNW 0 0 0 5 1 0 6 NW 0 0 0 2 1 0 3 NNW 0 3 3 1 0 0 7 Variable 0 0 0 0 0 0 0 Total 0 10 18 29 12 0 69 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 1 Hours of missing stability measurements in all stability classes: 98 F-51 Page 171 of 206

Byron Generating Station Period of Record: October - December 2014 Stability Class - Slightly Unstable - 250Ft-30Ft Delta-T (F)

Winds Measured at 250 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 1 1 1 3 0 6 NNE 0 0 1 0 0 0 1 NE 0 0 2 0 0 0 2 ENE 0 1 0 0 0 0 1 E 0 0 0 0 0 0 0 ESE 0 1 0 0 0 1 2 SE 0 0 2 3 0 0 5 SSE 0 0 1 4 2 0 7 S 0 1 0 3 1 0 5 SSW 0 1 3 0 3 0 7 SW 0 2 3 0 1 0 6 WSW 0 2 1 4 0 0 7 W 0 1 2 0 4 0 7 WNW 0 1 1 5 7 1 15 NW 0 0 1 2 2 0 5 NNW 0 0 2 8 0 0 10 Variable 0 0 0 0 0 0 0 Total 0 11 20 30 23 2 86 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: 98 F-52 Page 172 of 206

Byron Generating Station Period of Record: October - December 2014 Stability Class - Neutral - 250Ft-30Ft Delta-T (F)

Winds Measured at 250 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 2 24 21 30 2 9 88 NNE 0 12 30 13 3 0 58 NE 1 7 7 0 0 0 15 ENE 1 0 5 1 0 0 7 E 1 7 8 2 0 0 18 ESE 3 7 8 3 4 0 25 SE 1 9 10 27 7 0 54 SSE 0 7 10 35 21 4 77 S 0 3 9 29 20 1 62 SSW 0 2 20 25 16 0 63 SW 0 5 16 17 9 1 48 WSW 0 11 12 20 2 2 47 W 3 9 16 65 45 16 154 WNW 1 10 32 79 41 6 169 NW 9 8 17 42 23 1 100 NNW 2 16 18 45 9 9 99 Variable 0 0 0 0 0 0 0 Total 24 137 239 433 202 49 1084 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 8 Hours of missing stability measurements in all stability classes: 98 F-53 Page 173 of 206

Byron Generating Station Period of Record: October - December 2014 Stability Class - Slightly Stable - 250Ft-30Ft Delta-T (F)

Winds Measured at 250 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 1 6 3 16 0 0 26 NNE 1 3 8 6 0 0 18 NE 0 1 6 6 0 0 13 ENE 0 4 5 3 0 0 12 E 1 3 1 3 1 0 9 ESE 0 2 2 11 4 0 19 SE 0 1 2 7 2 0 12 SSE 0 3 4 12 26 1 46 S 1 1 6 19 37 4 68 SSW 0 2 4 32 41 4 83 SW 0 1 18 18 12 0 49 WSW 0 3 21 29 5 1 59 W 1 6 24 23 8 0 62 WNW 1 4 16 16 4 0 41 NW 0 2 13 16 0 0 31 NNW 1 1 4 2 0 0 8 Variable 0 0 0 0 0 0 0 Total 7 43 137 219 140 10 556 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: 98 F-54 Page 174 of 206

Byron Generating Station Period of Record: October - December 2014 Stability Class - Moderately Stable - 250Ft-30Ft Delta-T (F)

Winds Measured at 250 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 2 2 4 0 0 8 NNE 0 0 1 6 1 0 8 NE 0 1 1 0 0 0 2 ENE 0 2 3 0 0 0 5 E 0 1 5 0 0 0 6 ESE 1 1 2 5 0 0 9 SE 0 0 3 10 14 0 27 SSE 0 1 1 2 5 0 9 S 0 1 3 5 4 0 13 SSW 0 0 2 5 5 0 12 SW 0 0 4 9 0 0 13 WSW 0 0 0 2 0 0 2 W 0 0 2 10 0 0 12 WNW 0 2 3 3 0 0 8 NW 0 0 3 8 0 0 11 NNW 0 0 0 2 0 0 2 Variable 0 0 0 0 0 0 0 Total 1 11 35 71 29 0 147 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 98 F-55 Page 175 of 206

Byron Generating Station Period of Record: October - December 2014 Stability Class - Extremely Stable - 250Ft-30Ft Delta-T (F)

Winds Measured at 250 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 1 1 0 3 0 0 5 NNE 1 2 0 4 1 0 8 NE 0 0 0 0 0 0 0 ENE 0 4 0 0 0 0 4 E 1 2 0 0 0 0 3 ESE 0 1 1 0 0 0 2 SE 0 0 0 4 7 1 12 SSE 0 0 0 4 1 0 5 S 0 0 0 1 0 0 1 SSW 0 0 1 4 0 0 5 SW 0 0 3 3 0 0 6 WSW 0 1 1 0 0 0 2 W 0 1 0 0 0 0 1 WNW 0 1 0 0 0 0 1 NW 0 0 0 0 0 0 0 NNW 0 1 0 0 0 0 1 Variable 0 0 0 0 0 0 0 Total 3 14 6 23 9 1 56 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: 98 F-56 Page 176 of 206

APPENDIX G ERRATA DATA Page 177 of 206

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Errata Data Original Maximum Corrected Maximum 2013 Quarterly average Quarterly average concentration (uCi/ml) concentration (uCi/ml)

Fission & Activation Products 2.50E-09 1.25E-09 Tritium 1.72E-04 8.58E-05 Dissolved & Entrained Gases 5.18E-11 2.59E-11 Original Maximum Corrected Maximum 2012 Quarterly average Quarterly average concentration (uCi/ml) concentration (uCi/ml)

Fission & Activation Products 1.95E-09 9.74E-10 Tritium 3.34E-04 1.67E-04 Dissolved & Entrained Gases 6.88E-10 3.44E-10 Original Maximum Corrected Maximum 2011 Quarterly average Quarterly average concentration (uCi/ml) concentration (uCi/ml)

Fission & Activation Products 2.46E-09 1.23E-09 Tritium 4.26E-04 2.13E-04 Dissolved & Entrained Gases 2.90E-10 1.45E-10 Original Maximum Corrected Maximum 2010 Quarterly average Quarterly average concentration (uCi/ml) concentration (uCi/ml)

Fission & Activation Products 1.23E-09 6.13E-10 Tritium 2.30E-04 1.15E-04 Dissolved & Entrained Gases 3.24E-10 1.62E-10 G-1 Page 179 of 206

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APPENDIX H ANNUAL RADIOLOGICAL GROUNDWATER PROTECTION PROGRAM REPORT (ARGPPR)

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Docket No: 50-454 50-455 BYRON NUCLEAR GENERATING STATION UNITS 1 and 2 Annual Radiological Groundwater Protection Program Report 1 January Through 31 December 2014 Prepared By Teledyne Brown Engineering Environmental Services Byron Nuclear Generating Station Byron, IL 61010 May 2015 Page 183 of 206

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Table Of Contents I. Summary and Conclusions ............................................................................................ 3 II. Introduction .................................................................................................................... 4 A. Objectives of the RGPP....................................................................................... 4 B. Implementation of the Objectives ........................................................................ 5 C. Program Description ............................................................................................ 6 D. Characteristics of Tritium (H-3)............................................................................ 6 III. Program Description ..................................................................................................... 7 A. Sample Analysis .................................................................................................. 7 B. Data Interpretation ............................................................................................... 7 C. Background Analysis ........................................................................................... 8

1. Background Concentrations of Tritium ..................................................... 9 IV. Results and discussion .............................................................................................. 10 A. Groundwater Results ......................................................................................... 10 B. Drinking Water Well Survey .............................................................................. 12 C. Summary of Results - Inter-laboratory Comparison Program .......................... 12 D. Leaks, Spills, and Releases .............................................................................. 12 E. Trends................................................................................................................ 12 F. Investigations ..................................................................................................... 13 G. Actions Taken ................................................................................................... 13 i

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Appendices Appendix A Location Designation Tables Table A-1 Radiological Groundwater Protection Program - Sampling Locations, Distance and Direction, Byron Nuclear Generating Station, 2014 Figures Figure A-1 Monitoring Well Locations, Byron Nuclear Generating Station, 2014 (Extra wells noted on map are for reference only.)

Appendix B Data Tables Tables 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, 2014.

Table B-I.2 Concentrations of Gamma Emitters in Groundwater Samples Collected in the Vicinity of Byron Nuclear Generating Station, 2014.

ii Page 186 of 206

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

Phase 2 of the RGPP was conducted by Exelon corporate and station personnel to initiate follow up of Phase 1 and begin long-term monitoring at groundwater locations selected during Phase 1. This is the eighth 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 samples, collected from the environment, both on and off station property in 2014. During that time period, 122 analyses were performed on 54 samples from 15 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 10 times lower than that required by federal regulation.

In 2014, 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 May. 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 459 - 791 pCi/L; AR-7, with concentrations ranging from 325 - 791 pCi/L; and AR-11, with concentrations ranging from 822 - 984 pCi/L. Wells AR-4 and AR-11 are near the Circulating Water Blowdown piping, where historical leakage through vacuum breakers was known to have occurred. Tritium concentrations in these wells have decreased since being first sampled in 2006. In 2014, tritium was measured in Well AR-7, located on-site, just west plant structures, at concentrations between 701 and 325 pCi/L. 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).

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In August 2014, a break in the well piping was discovered about six feet below the surface that could have served as the entry point for tritium in the recapture water. Since the well was repaired, 3 of the 4 tritium samples obtained have measured less than 370 pCi/L. Should the water in this aquifer 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.

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

Gross Alpha and Gross Beta analyses in the dissolved and suspended fractions were performed on groundwater samples during the second quarter sampling in 2014. Gross Alpha (dissolved) was not detected in any of eight groundwater locations. Gross Alpha (suspended) was detected in one of eight groundwater locations at a concentration of 6.3 pCi/L. Gross Beta (dissolved) was detected in five of eight groundwater locations. The concentrations ranged from 2.9 to 23 pCi/L. Gross Beta (suspended) was detected in two of eight groundwater locations. The concentration ranged from 4.4 to 13 pCi/L. 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 2014.

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 1,268 and 1,241 MW gross, respectively. Unit One loaded fuel in November 1984 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 2014.

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

1. Identify suitable locations to monitor and evaluate potential impacts Page 188 of 206

from station operations before significant radiological impact to the environment and potential drinking water sources.

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

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

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

5. Regularly assess analytical results to identify adverse trends.

6. Take necessary corrective actions to protect groundwater resources.

B. Implementation of the Objectives The objectives identified have been implemented at Byron Nuclear Generating Station as discussed below:

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

2. The Byron 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.

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C. Program Description

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

Groundwater Samples of water are collected, managed, transported and analyzed in accordance with approved procedures 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. Within one month or so after ingestion, essentially all tritium is cleared. Organically bound tritium (tritium that is incorporated in organic compounds) can remain in the body for a longer period.

Tritium is produced naturally in the upper atmosphere when cosmic rays strike air molecules. Tritium is also produced during nuclear weapons explosions, as a by-product in reactors producing electricity, and in special Page 190 of 206

production reactors, where the isotopes lithium-7 and/or boron-10 are activated to produce tritium. Like normal water, tritiated water is colorless and odorless. Tritiated water behaves chemically and physically like non-tritiated water in the subsurface, and therefore tritiated water will travel at the same velocity as the average groundwater velocity.

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

III. Program Description A. Sample Analysis This section describes the general analytical methodologies used by TBE to analyze the environmental samples for radioactivity for the Byron Nuclear Generating Station RGPP in 2014.

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

1. 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:

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

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

Statistically, the exact value of a measurement is expressed as a range with a stated level of confidence. The convention is to report results with a 95% level of confidence. The uncertainty comes from calibration standards, sample volume or weight measurements, sampling uncertainty and other factors. 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.

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1. Background Concentrations of Tritium The purpose of the following discussion is to summarize background measurements of tritium in various media performed by others. Additional detail may be found by consulting references (CRA 2006).

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

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

b. Precipitation Data Precipitation samples are routinely collected at stations around the world for the analysis of tritium and other radionuclides. Two publicly available databases that provide tritium concentrations in precipitation are Global Network of Isotopes in Precipitation (GNIP) and USEPAs RadNet database. GNIP provides tritium precipitation concentration data for samples collected world wide from 1960 to 2006.

RadNet provides tritium precipitation concentration data for samples collected at stations through out the U.S. from 1960 up to and including 2006. Based on GNIP data for sample stations located in the U.S. Midwest, tritium concentrations Page 193 of 206

peaked around 1963. This peak, which approached 10,000 pCi/L for some stations, coincided with the atmospheric testing of thermonuclear weapons. Tritium concentrations in surface water showed a sharp decline up until 1975 followed by a gradual decline since that time. Tritium concentrations in Midwest precipitation have typically been below 100 pCi/L since around 1980. Tritium concentrations in wells may still be above the 200 pCi/L detection limit from the external causes described above. Water from previous years and decades is naturally captured in groundwater, so some well water sources today are affected by the surface water from the 1960s that was elevated in tritium.

c. Surface Water Data Tritium concentrations are routinely measured in large surface water bodies, including Lake Michigan and the Mississippi River. Illinois surface water data were typically less than 100 pCi/L.

The 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 +/- 100 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.

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Tritium Samples from all locations were analyzed for tritium activity (Table B-I.1, Appendix B). Tritium values ranged from less than the detection limit to 984 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 2014, 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 May. 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 459 - 791 pCi/L; AR-7, with concentrations ranging from 325 - 791 pCi/L; and AR-11, with concentrations ranging from 822 - 984 pCi/L. Wells AR-4 and AR-11 are near the Circulating Water Blowdown piping, where historical leakage through vacuum breakers was known to have occurred. Tritium concentrations in these wells have decreased since being first sampled in 2006. In 2014, tritium was measured in Well AR-7, located on-site, just west plant structures, at concentrations between 701 and 325 pCi/L.

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 well piping was discovered about six feet below the surface that could have served as the entry point for tritium in the recapture water. Since the well was repaired, 3 of the 4 tritium samples obtained have measured less than 370 pCi/L. The tritium detected in groundwater samples has been isolated to the Galena- Platteville aquifer, which is isolated from the deeper regional groundwater aquifer by the semi-confining Glenwood Formation. Groundwater quality data from production wells and monitoring wells at the station located below this aquifer do not indicate concentrations of tritium greater than the LLD of 200 pCi/L. As such, the tritium impact is limited to the Galena- Platteville aquifer.

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

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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 2014. Gross Alpha (dissolved) was not detected in any of eight groundwater locations. Gross Alpha (suspended) was detected in one of eight groundwater locations at a concentration of 6.3 pCi/L. Gross Beta (dissolved) was detected in five of eight groundwater locations. The concentrations ranged from 2.9 to 23 pCi/L. Gross Beta (suspended) was detected in two of eight groundwater locations. The concentration ranged from 4.4 to 13 pCi/L. 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 Naturally occurring K-40 was detected in one sample at a concentration of 98 pCi/L. All other gamma-emitting radionuclides associated with licensed plant operations were not detected at concentrations greater than their respective LLDs in any of the samples during 2014.

Hard-To-Detect Hard-To-Detect analyses were not performed in 2014.

B. Drinking Water Well Survey No drinking water well surveys were conducted in 2014.

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 2014.

E. Trends Wells AR-4 and AR-11 have shown an overall decrease in tritium concentration since first sampled in 2006. Tritium has been measured in Well AR-7 since 2012, however, tritium has been previously measured in Page 196 of 206

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 2014 as a result of groundwater sample results.

G. Actions Taken

1. Compensatory Actions No compensatory actions were initiated in 2014.

2. Installation of Monitoring Wells No new monitoring wells were installed in 2014.

3. Actions to Recover/Reverse Plumes No actions were undertaken to recover/reverse plumes in 2014.

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APPENDIX A LOCATION DESIGNATION Page 199 of 206

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TABLE A-1: Radiological Groundwater Protection Program - Sampling Locations, Distance and Direction, Byron Nuclear Generating Station, 2014 Site Site Type Temporary/Permanent Distance and Direction AR-1 Monitoring Well Permanent 0.36 miles/NNW AR-10 Monitoring Well Permanent 0.28 miles/NE AR-11 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 0.24 miles/E CAR-1 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-1 (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 A-1 Page 201 of 206

A-2 Page 202 of 206 Figure A-1 Monitoring Well Locations, Byron Nuclear Generating Station, 2014

APPENDIX B DATA TABLES Page 203 of 206

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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, 2014 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)

BY-AR-1 03/17/14 < 182 BY-AR-1 05/13/14 < 167 < 6.8 < 0.6 < 1.1 < 1.5 < 2.1 < 2.7 BY-AR-1 08/13/14 < 182 BY-AR-1 10/20/14 < 186 BY-AR-10 03/17/14 < 181 BY-AR-10 05/13/14 < 183 < 6.4 < 0.5 < 3.6 6.3 +/- 3.2 < 6.7 13.0 +/- 2.9 BY-AR-10 08/13/14 < 182 BY-AR-10 10/20/14 < 187 BY-AR-11 03/19/14 984 +/- 167 BY-AR-11 05/14/14 822 +/- 154 BY-AR-11 08/14/14 950 +/- 166 BY-AR-11 10/22/14 907 +/- 164 BY-AR-2 05/14/14 < 182 BY-AR-2 10/22/14 < 157 BY-AR-3 05/14/14 < 180 < 6.6 < 0.6 < 1.4 < 2.2 4.8 +/- 1.7 < 2.7 BY-AR-3 08/14/14 < 182 BY-AR-3 10/22/14 < 156 BY-AR-4 03/19/14 746 +/- 151 BY-AR-4 05/14/14 791 +/- 151 < 6.9 < 0.7 < 1.7 < 1.9 < 2.7 < 2.5 BY-AR-4 08/14/14 459 +/- 140 BY-AR-4 10/22/14 580 +/- 127 BY-AR-7 03/17/14 Original 701 +/- 153 BY-AR-7 03/17/14 Recount 564 +/- 151 BY-AR-7 04/28/14 572 +/- 131 < 5.5 < 0.4 < 2.0 < 1.2 14.8 +/- 1.8 < 1.9 BY-AR-7 05/12/14 557 +/- 133 < 5.7 < 0.6 < 3.5 < 3.0 23.0 +/- 2.9 < 3.0 BY-AR-7 06/20/14 647 +/- 145 BY-AR-7 07/18/14 570 +/- 129 BY-AR-7 08/26/14 369 +/- 118 BY-AR-7 09/19/14 325 +/- 132 BY-AR-7 10/20/14 570 +/- 147 BY-AR-7 11/12/14 359 +/- 144 BY-AR-8 03/17/14 < 183 BY-AR-8 05/12/14 < 182 < 6.9 < 0.6 < 1.1 < 3.3 2.9 +/- 1.4 4.4 +/- 2.2 BY-AR-8 08/13/14 < 183 BY-AR-8 10/20/14 < 183 BY-AR-9 03/17/14 < 183 BY-AR-9 05/13/14 < 184 < 7.0 < 0.6 < 2.0 < 1.9 3.4 +/- 1.9 < 2.5 BY-AR-9 08/26/14 < 158 BY-AR-9 10/20/14 < 187 BY-CAR-1 05/14/14 < 197 BY-CAR-1 10/22/14 < 187 BY-CAR-3 03/17/14 < 199 BY-CAR-3 05/12/14 < 180 < 4.5 < 0.5 < 4.0 < 1.9 5.5 +/- 2.4 < 2.5 BY-CAR-3 08/13/14 < 180 BY-CAR-3 10/20/14 < 187 BY-DF-24 03/19/14 < 178 BY-DF-24 05/14/14 < 183 BY-DF-24 08/14/14 < 180 BY-DF-24 10/22/14 < 184 BY-MW-1 05/14/14 < 195 BY-MW-1 10/22/14 < 187 BY-MW-3 05/14/14 < 194 BY-MW-3 10/22/14 < 188 BY-TW-13 05/14/14 < 178 BY-TW-13 10/22/14 < 187 B-1 Page 205 of 206

TABLE B-I.2 CONCENTRATIONS OF GAMMA EMITTERS IN GROUNDWATER SAMPLES COLLECTED IN THE VICINITY OF BYRON NUCLEAR GENERATION STATION, 2014 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA SITE COLLECTION Be-7 K-40 Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 I-131 Cs-134 Cs-137 Ba-140 La-140 DATE BY-AR-1 05/13/14 < 32 < 33 < 3 < 3 < 6 < 3 < 7 < 4 < 7 < 7 < 3 < 4 < 17 < 7 BY-AR-10 05/13/14 < 52 < 55 < 6 < 6 < 11 < 6 < 13 < 7 < 11 < 12 < 8 < 7 < 31 < 11 BY-AR-11 05/14/14 < 29 < 70 < 3 < 3 < 7 < 3 < 7 < 3 < 6 < 6 < 3 < 4 < 18 < 6 BY-AR-2 05/14/14 < 31 < 66 < 3 < 4 < 6 < 3 < 6 < 4 < 7 < 6 < 3 < 4 < 16 < 5 BY-AR-3 05/14/14 < 36 < 35 < 4 < 4 < 9 < 5 < 7 < 5 < 7 < 7 < 4 < 4 < 22 < 7 BY-AR-4 05/14/14 < 32 < 27 < 3 < 3 < 6 < 3 < 7 < 3 < 5 < 6 < 3 < 3 < 15 < 5 BY-AR-7 04/28/14 < 11 < 28 < 1 < 1 < 3 < 1 < 2 < 1 < 2 < 4 < 1 < 1 < 9 < 2 BY-AR-7 05/12/14 < 43 < 83 < 4 < 4 < 9 < 5 < 9 < 5 < 8 < 9 < 4 < 5 < 24 < 11 BY-AR-8 05/12/14 < 34 < 82 < 3 < 4 < 8 < 3 < 7 < 4 < 6 < 8 < 4 < 4 < 21 < 7 BY-AR-9 05/13/14 < 37 < 32 < 4 < 4 < 10 < 4 < 8 < 5 < 7 < 9 < 4 < 4 < 25 < 7 BY-CAR-1 05/14/14 < 39 < 36 < 4 < 4 < 7 < 4 < 8 < 4 < 7 < 8 < 5 < 4 < 21 < 5 BY-CAR-3 05/12/14 < 37 < 40 < 4 < 4 < 10 < 4 < 9 < 4 < 8 < 9 < 3 < 4 < 23 < 10 BY-TW-13 05/14/14 < 36 98 +/- 53 < 3 < 4 < 7 < 5 < 8 < 4 < 7 < 7 < 4 < 4 < 17 < 5 B-2 Page 206 of 206

BYRON 2015-0054, 2014 Annual Radiological Environmental Operating Report (AREOR)

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PERIOD DOSE BY ORGAN AND AGE GROUP (mrem) ============ ANNUAL 2014 ======

SITE DOSE LIMIT ANALYSIS ============================= ANNUAL 2014 ======

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I&P DOSE LIMIT ANALYSIS ============================== ANNUAL 2014 ======

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NG DOSE LIMIT ANALYSIS =============================== ANNUAL 2014 ======

MAXIMUM DOSE ANALYSIS ================================ ANNUAL 2014 ======

MAXIMUM DOSE ANALYSIS ================================ ANNUAL 2014 ======

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BYRON 2015-0054, 2014 Annual Radiological Environmental Operating Report (AREOR)

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SUMMARY

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SUMMARY

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PERIOD DOSE BY ORGAN AND AGE GROUP (mrem) ============ ANNUAL 2014 ======

SITE DOSE LIMIT ANALYSIS ============================= ANNUAL 2014 ======

SUMMARY

I&P DOSE LIMIT ANALYSIS ============================== ANNUAL 2014 ======

SUMMARY

NG DOSE LIMIT ANALYSIS =============================== ANNUAL 2014 ======

MAXIMUM DOSE ANALYSIS ================================ ANNUAL 2014 ======

MAXIMUM DOSE ANALYSIS ================================ ANNUAL 2014 ======

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