ML091270070

Byron Nuclear Generating Station Units 1 and 2, Annual Radiological Environmental Operating Report, 1 January Through 31 December 2008

ML091270070
Person / Time
Site:	Byron
Issue date:	05/01/2009
From:	Teledyne Brown Engineering Environmental Services
To:	Office of Nuclear Reactor Regulation
References
FOIA/PA-2010-0209
Download: ML091270070 (206)

Text

Docket No: 50-454 50-455 BYRON NUCLEAR GENERATING STATION UNITS 1 and 2 Annual Radiological Environmental Operating Report 1 January Through 31 December 2008 Prepared By Teledyne Brown Engineering Environmental Services Nuclear Byron Nuclear Generating Station Byron, IL 61010 May 2009 1 of 206 2 of 206 Table Of Contents I. Sum m ary and Conclusions

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1 II. Introduction

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3 A .O bjectives of the REM P ..................................................................................

3 B. Im plem entation of the O bjectives

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.3 II1. Program Description

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3 A. Sam ple Collection

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3 B. Sam ple Analysis ................................................................................................

6 C .Data Interpretation

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6 D. Program Exceptions

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7 E. Program Changes .........................................................................................

11 IV. Results and Discussion

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11 A .Aquatic Environm ent ......................................................................................

11 1. Surface W ater ......................................................................................

11 2. G round W ater ......................................................................................

12 3. Fish ......................................................................................................

12 4. Sedim ent ..............................................................................................

12 B, Atm ospheric Environm ent ...............................................................

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13 1. Airborne .....................

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13 a. Air Particulates

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

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14 2. Terrestrial

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14 a. M ilk ................................................................

14 b. Vegetation

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14 C .Am bient G am m a Radiation

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15 D. Land Use Survey ...........................................................................................

15 E, Errata Data ....................................................................................................

16 F, Summary of Results -Inter-laboratory Comparison Program .......................

16 3 of 206 Appendices Appendix A Radiological Environmental Monitoring Report Summary Tables Table A-1 Appendix B Tables Table B-1: Table B-2: Radiological Environmental Monitoring Program Summary for Byron Nuclear Generating Station, 2008 Location Designation, Distance & Direction, and Sample Collection

&Analytical Methods Radiological Environmental Monitoring Program -Sampling Locations, Distance and Direction, Byron Nuclear Generating Station, 2008 Radiological Environmental Monitoring Program -Summary of Sample Collection and Analytical Methods, Byron Nuclear Generating Station, 2008 Figqures Figure B-I: Figure B-2: Figure B-3: Figure B-4: Appendix C Tables Table C-1.1 Inner and Outer Ring TLD Locations of the Byron Nuclear Generating Station, 2008 Onsite Air Sampling Locations of the Byron Nuclear Generating Station, 2008 Offsite Air Sampling Locations of the Byron Nuclear Generating Station, 2008 Ingestion and Waterborne Exposure Pathway Sampling Locations of the Byron Nuclear Generating Station, 2008 Data Tables and Figures -Primary Laboratory Concentrations of Gross Beta in Surface Water Samples Collected in the Vicinity of Byron Nuclear Generating Station, 2008.Concentrations of Tritium in Surface Water Samples Collected in the Vicinity of Byron Nuclear Generating Station, 2008.Table C-1.2 ii 4 of 206 Table C-1.3 Table C-11.1 Table C-11.2 Table C-111.1 Table C-IV.1 Table C-V.1 Table C-V.2 Table C-V.3 Table C-VI.1 Table C-VII.1 Table C-VII.2 Table C-VIII.1 Table C-IX.1 Table C-IX.2 Table C-IX.3 Fi-gures Figure C-1 Figure C-2 Figure C-3 Concentrations of Gamma Emitters in Surface Water Samples Collected in the Vicinity of Byron Nuclear Generating Station, 2008.Concentrations of Tritium in Ground Water Samples Collected in the Vicinity of Byron Nuclear Generating Station, 2008.Concentrations of Gamma Emitters in Ground Water Samples Collected in the Vicinity of Byron Nuclear Generating Station, 2008.Concentrations of Gamma Emitters in Fish Samples Collected in the Vicinity of Byron Nuclear Generating Station, 2008.Concentrations of Gamma Emitters in Sediment Samples Collected in the Vicinity of Byron Nuclear Generating Station, 2008.Concentrations of Gross Beta in Air Particulate Samples Collected in the Vicinity of Byron Nuclear Generating Station, 2008.Monthly and Yearly Mean Values of Gross Beta Concentrations in Air Particulate Samples Collected in the Vicinity of Byron Nuclear Generating Station, 2008.Concentrations of Gamma Emitters in Air Particulate Samples Collected in the Vicinity of Byron Nuclear Generating Station, 2008.Concentrations of 1-131 in Air Iodine Samples Collected in the Vicinity of Byron Nuclear Generating Station, 2008.Concentrations of 1-131 in Milk Samples Collected in the Vicinity of Byron Nuclear Generating Station, 2008.Concentrations of Gamma Emitters in Milk Samples Collected in the Vicinity of Byron Nuclear Generating Station, 2008.Concentrations of Gamma Emitters in Vegetation Samples Collected in the Vicinity of Byron Nuclear Generating Station, 2008.Quarterly TLD Results for Byron Nuclear Generating Station, 2008.Mean Quarterly TLD Results for the Inner Ring, Outer Ring, Other and Control Locations for Byron Nuclear Generating Station, 2008.Summary of the Ambient Dosimetry Program for Byron Nuclear Generating Station, 2008.Surface Water -Gross Beta -Stations BY-12 and BY-29 (C) Collected in the Vicinity of BNGS, 2000 -2008.Surface Water -Tritium -Stations BY-12 and BY-29 (C) Collected in the Vicinity of BNGS, 2000 -2008.Ground Water -Tritium -Stations BY-14-1 and BY-18 Collected in the Vicinity of BNGS, 2000 -2008.iii 5 of 206 Figure C-4 Figure C-5 Figure C-6 Figure C-7 Figure C-8 Figure C-9 Figure C-10 Figure C-1 1 Appendix D Tables Table D-1 Table D-2 Table D-3 Appendix E Appendix E-1 Ground Water -Tritium -Station BY-32 Collected in the Vicinity of BNGS, 2000 -2008.Ground Water -Tritium -Station BY-35 and BY-36 Collected in the Vicinity of BNGS, 2006 -2008.Ground Water -Tritium -Station BY-37 Collected in the Vicinity of BNGS, 2006 -2008.Air Particulate

-Gross Beta -Stations BY-08 (C) and BY-21 Collected in the Vicinity of BNGS, 2000 -2008.Air Particulate

-Gross Beta -Stations BY-22 and BY-23 Collected in the Vicinity of BNGS, 2000 -2008.Air Particulate

-Gross Beta -Station BY-24 Collected in the Vicinity of BNGS, 2000 -2008.Air Particulate

-Gross Beta -Station BY-01 and BY-04 Collected in the Vicinity of BNGS, 2005 -2008.Air Particulate

-Gross Beta -Station BY-06 Collected in the Vicinity of BNGS, 2005 -2008.Inter-Laboratory Comparison Program Analytics Environmental Radioactivity Cross Check Program Teledyne Brown Engineering, 2008 ERA Environmental Radioactivity Cross Check Program Teledyne Brown Engineering, 2008 DOE's Mixed Analyte Performance Evaluation Program (MAPEP)Teledyne Brown Engineering, 2008 Effluent Report Data Tables and Figures iv 6 of 206 Appendix F Appendix G Meteorological Data Annual Radiological Groundwater Protection Program Report (ARGPPR)v 7 of 206

1. Summary and Conclusions This report on the Radiological Environmental Monitoring Program conducted for the Byron Nuclear Generating Station (BNGS) by Exelon covers the period 1 January 2008 through 31 December 2008. During that time period, 1,432 analyses were performed on 1,290 samples. In assessing all the data gathered for this report and comparing these results with preoperational data, it was concluded that the operation of BNGS had no adverse radiological impact on the environment.

Surface water samples were analyzed for concentrations of gross beta, tritium 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.Fish (commercially and/or recreationally important species) and sediment samples were analyzed for concentrations of gamma emitting nuclides.Cesium-1 37 activity was found at both sediment locations and was consistent with data from previous years. No plant produced fission or activation products were found in fish or sediment.Air particulate samples were analyzed for concentrations of gross beta and gamma emitting nuclides.

No fission or activation products were detected.High sensitivity 1-131 analyses were performed on weekly air samples. All results were less than the minimum detectable activity.Cow milk samples were analyzed for concentrations of 1-131 and gamma emitting nuclides.

All 1-131 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 thermoluminescent dosimeters.

Levels detected were consistent with those observed in previous years.-1 -8 of 206 Intentionally left blank-2-9 of 206 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 1280 and 1254 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 regulations.

This report covers those analyses performed by Teledyne Brown Engineering (TBE) and Global Dosimetry on samples collected during the period 1 January 2008 through 31 December 2008.A. Objective of the REMP The objectives of the REMP are to: 1. Provide data on measurable levels of radiation and radioactive materials in the site environs.2. Evaluate the relationship between quantities of radioactive material released from the plant and resultant radiation doses to individuals from principal pathways of exposure.B. Implementation of the Objectives The implementation of the objectives is accomplished by: 1. Identifying significant exposure pathways.2. Establishing baseline radiological data of media within those pathways.3. Continuously monitoring those media before and during Station operation to assess Station radiological effects (if any) on man and the environment.

Ill. Program Description A. Sample Collection Samples for the BNGS REMP were collected for Exelon Nuclear by Environmental Inc. (Midwest Labs). This section describes the general-3-10 of 206 collection methods used by Environmental Inc. to obtain environmental samples for the BNGS REMP in 2008. 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, well 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 well water locations (BY-14-1, BY-18, 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 channel catfish, river carpsucker, smallmouth bass 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.Atmospheric Environment The atmospheric environment was evaluated by performing radiological analyses on samples of air particulate, airborne iodine, and milk. 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.Milk samples were collected biweekly at three locations (BY-20-1, BY-26-1 and BY-30-1) from May through October, and monthly from November through April. The control location was BY-26-1. All samples were collected in new unused two gallon plastic bottles from the bulk tank at each location, preserved with sodium bisulfite, and shipped promptly to the laboratory.

Food products were collected annually in September 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.-4-S1 of 206 Ambient Gamma Radiation Direct radiation measurements were made using CaF 2 thermoluminescent dosimeters (TLD). The TLD locations were placed on and around the BNGS 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 release.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-21 1, 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 three locations (BY-301-1, BY-302-1 and BY-314-1).

An other set consisting of seven locations (BY-01, BY-04, BY-06, BY-21, BY-22, BY-23 and BY-24).The balance of one location (BY-08) representing the control area.The specific TLD 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;

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 TLDs -each comprised of two CaF 2 thermoluminescent phosphors enclosed in plastic -were placed at each location located at a minimum of five feet above ground level. The TLDs were exchanged quarterly and-5-12 of 206 sent to Global Dosimetry for analysis.B. Sample Analysis This section describes the general analytical methodologies used by TBE and Environmental Inc. (Midwest Labs) to analyze the environmental samples for radioactivity for the BNGS REMP in 2008. The analytical procedures used by the laboratories 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 1-131 in air and milk.5. Ambient gamma radiation levels at various site environs.C. Data Interpretation The radiological and direct radiation data collected prior to Byron Nuclear Generating Station becoming operational were used as a baseline with which these operational data were compared.

For the purpose of this report, Byron Nuclear Generating Station was considered operational at initial criticality.

In addition, data were compared to previous years'operational data for consistency and trending.

Several factors were important in the interpretation of the data: 1. Lower Limit of Detection and Minimum Detectable Concentration The lower limit of detection (LLD) was defined as the smallest concentration of radioactive material in a sample that would yield a net count (above background) that would be detected with only a 5% probability of falsely concluding that a blank observation represents a "real" signal. The LLD was intended as a before-the-fact estimate of a system (including instrumentation, procedure and sample type) and not as an after-the-fact criteria for the presence of activity.

All analyses were designed to achieve the required BNGS detection capabilities for environmental sample analysis.-6-13 of 206 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, 1-131, Cs-134, Cs-137, Ba-140, and La-140 were reported.For fish, sediment, air particulate, milk and vegetation eleven nuclides, Mn-54, Co-58, Fe-59, Co-60, Zn-65, Nb-95, Zr-95, Cs-134, Cs-137, Ba-140 and La-140 were reported.Means and standard deviations of the results were calculated.

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

D. Program Exceptions For 2008 the BNGS REMP had a sample recovery rate in excess of 99%.Sample anomalies and missed samples are listed in the tables below: Table D-1 LISTING OF SAMPLE ANOMALIES Sample Location Collection Reason Type Code Date A/I BY-24 01/08/08 Run time meter not running; estimated time and replaced A/I BY-22 04/16/08 Timer not running; estimated time and replaced A/I BY-04 05/06/08 Run time meter would not reset; meter replaced A/I BY-21 06/03/08 No power due to storm; power lost and restored the same day-7-14 of 206 Table D-1 LISTING OF SAMPLE ANOMALIES (cont'd)Sample Sample Type A/I Location Code BY-24 BY-1 02-1 BY- 102-2 BY-1 05-1 Collection Date 06/03/08 06/03/08 07/01/08 Reason TLD TLD TLD A/I A/I A/I A/I TLD BY-212-4 07/01/08 A/I A/I A/I A/I A/I A/I A/I A/I BY-04 BY-22 BY-23 BY-24 BY- 108-2 BY-01 BY-04 BY-06 BY-08 BY-21 BY-22 BY-23 BY-24 08/05/08 08/05/08 08/05/08 08/05/08 08/05/08 08/05/08 08/05/08 08/05/08 08/05/08 08/05/08 08/05/08 08/05/08 08/05/08 Run time meter low due to power outage from storms Poles holding TLDs blown over from storms;TLDs were reattached to replacement poles Could not differentiate results between BY-105-1 & BY-212-4 Could not differentiate results between BY-105-1 & BY-212-4 No power due to storm No power due to storm No power due to storm No power due to storm TLD knocked off pole from falling tree;reattached Low timer reading due power outage from storm; estimated time Low timer reading due power outage from storm; estimated time Low timer reading due power outage from storm; estimated time Low timer reading due power outage from storm; estimated time Low timer reading due power outage from storm; estimated time Low timer reading due power outage from storm; estimated time Low timer reading due power outage from storm; estimated time Low timer reading due power outage from storm; estimated time 8 15 of 206 Table D-1 LISTING OF SAMPLE ANOMALIES (cont'd)Sample Type A/I Location Code BY-04 Collection Reason A/I A/I A/I A/I V BY-22 BY-23 BY-24 Date 08/12/08 08/12/08 08/12/08 08/12/08 09/09/08 09/09/08 09/30/08 10/14/08 Low timer reading due power outage from storm; estimated time Low timer reading due power outage from storm; estimated time Low timer reading due power outage from storm; estimated time Low timer reading due power outage from storm; estimated time Vacuum gauge broken; replaced & checked Vegetation sample recollected due to measurement change; original QUAD 3 sample location found to be in QUAD 4 Vacuum gauge broken; replaced & checked Vacuum gauge broken; replaced & checked BY-01 QUAD-3 A/I A/I BY-01 BY-24 Sample Locatio Sample Type SW SW M SW SW SW M M SW Locatior Code BY-12 BY-29 BY-38 BY-12 BY-29 BY-29 BY-38 BY-30 BY-29 Table D-2 LISTING OF MISSED SAMPLES n Collection Reason Date 01/02/08 No sample; ice on river 01/02/08 No sample; ice on river 01/08/08 No sample; goats not pro 01/22/08 No sample; ice on river 01/22/08 No sample; ice on river 01/29/08 No sample; ice on river 02/05/08 No sample; goats not pro 02/05/08 No sample; farmer sold rr 02/05/08 No sample; ice on river ducing until spring ducing until spring nilk cows_-16 of 206 Table D-2 LISTING OF MISSED SAMPLES Sample Location Collection Reason.Type Code Date SW BY-12 02/12/08 No sample; ice on river SW BY-29 02/12/08 No sample; ice on river SW BY-12 02/19/08 No sample; ice on river SW BY-29 02/19/08 No sample; ice on river SW BY-12 02/26/08 No sample; ice on river SW BY-29 02/26/08 No sample; ice on river SW BY-29 03/04/08 No sample; ice on river M BY-30 03/04/08-No milk; farmer sold milk cows M BY-38 03/04/08 No goat milk; goats not producing M BY-38 04/01/08 No goat milk; goats not producing M BY-38 05/06/08 Goat farmer stopped milking TLD BY-1 16-3 07/01/08 TLD not received & read by vendor V QUAD 3 09/09/08 Food product sample not obtained SW BY-12 12/09/08 No sample; ice on river SW BY-29 12/09/08 No sample; ice on river SW BY-12 12/16/08 No sample; ice on river SW BY-29 12/16/08 No sample; ice on river SW BY-12 12/23/08 No sample; ice on river SW BY-29 12/23/08 No sample; ice on river SW BY-29 12/30/08 No sample; ice on river 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. 17 of 206 The overall sample recovery rate indicates that the appropriate procedures and equipment are in place to assure reliable program implementation.

E. Program Changes Milk station BY-38 went out of business in January 2008.Milk station BY-30 went out of business in February 2008.Milk station BY-30-1 was added to the sampling program on April 1, 2008.TLD station BY-103-3 was added to the sampling program in April 2008.TLD station BY-1 04-3 was added to the sampling program in April 2008.TLD station BY-1 07-3 was added to the sampling program in April 2008.TLD station BY-1 16-3 was added to the sampling program in April 2008.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 Station's effluent releases.

The following analyses were performed.

Gross Beta Samples from both locations were analyzed for concentrations of gross beta (Table C-1.1, Appendix C). The values ranged from 3.5 to 6.4 pCi/I. Concentrations detected were consistent with those detected in previous years (Figure C-1, Appendix C).Tritium Quarterly composites of weekly collections were analyzed for tritium activity (Table C-1.2, Appendix C). No tritium was detected, and the required LLD was met. (Figure C-2, Appendix C).-11 -18 of 206 Gamma Spectrometrv Samples from both locations were analyzed for gamma emitting nuclides (Table C-1.3, 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, BY-32, BY-35, BY-36 and BY-37). These locations could be affected by Byron Nuclear Generating Station's effluent releases.

The following analyses were performed:

Tritium Quarterly grab samples from the locations were analyzed for tritium activity (Table C-11.1, Appendix C). No tritium was detected, and the required LLD was met (Figures C-3 and C-6, Appendix C).Gamma Spectrometry Samples from all locations were analyzed for gamma emitting nuclides (Table C-11.2 Appendix C). No nuclides were detected, and all required LLDs were met.3. Fish Fish samples comprised of smallmouth bass, channel catfish, river carpsucker and common carp were collected at two locations (BY-29 and BY-31) semiannually.

Location BY-31 could be affected by Byron Nuclear Generating Station's effluent releases.

The following analysis was performed:

Gamma Spectrometry The edible portion of fish samples from both locations was analyzed for gamma emitting nuclides (Table C-111.1, 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.

Both locations, located downstream,-12-19 of 206 could be affected by Byron Nuclear Generating Station's effluent releases.

The following analysis was performed:

Gamma Spectrometry Sediment samples from both locations were analyzed for gamma emitting nuclides (Table C-IV.1, Appendix C). Cesium-137 was detected in both locations.

The values ranged from 60 to 320 pCi/kg dry. Concentrations detected were consistent with those detected in previous years. 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 (BY-21, BY-22, BY-23 and BY-24), Far Field samplers within 4 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 5 to 38 E-3 pCi/m 3 with a mean of 19 E-3 pCi/m 3.The results from the Far Field locations (Group II)ranged from 7 to 42 E-3 pCi/m 3 with a mean of 20 E-3 pCi/m 3.The results from the Control location (Group Ill)ranged from 8 to 37 E-3 pCi/m 3 with a mean of 20 E-3 pCi/m 3.Comparison of the 2008 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 2008 indicate no notable differences among the three groups (Figures C-7 through C-1 1, Appendix C).-13-20 of 206 Gamma Spectrometry Weekly samples were composited quarterly and analyzed for gamma emitting nuclides (Table C-V.3, Appendix C). No nuclides were detected, and all required LLDs were met.b. Airborne Iodine Continuous air samples were collected from eight locations (BY-01, BY-04, BY-06, BY-08, BY-21, BY-22, BY-23, and BY-24) and analyzed weekly for 1-131 (Table C-VI.1, Appendix C). No 1-131 was detected and the required LLD was met.2. Terrestrial

a. Milk Samples were collected from four locations (BY-20-1, BY-26-1, BY-30 and BY-30-1) biweekly May through October and monthly November through April. The following analyses were performed:

Iodine-131 Milk samples from all locations were analyzed for concentrations of 1-131 (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 Station's effluent releases.

The following analysis was performed: 21 of 206 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 Panasonic 814 (CaF 2) thermoluminescent dosimeters.

Eighty-seven TLD locations were established around the site. Results of TLD measurements are listed in Tables C-IX.1 to C-IX.3, Appendix C.Most TLD measurements were below 30 mR/standard month, with a range of 16 to 30 mR/standard month. 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 2008 around the Byron Nuclear Generating Station (BNGS) was performed by Environmental Inc.(Midwest Labs) for Exelon Nuclear to comply with the Byron Nuclear Generating Station's Offsite Dose Calculation Manual. The purpose of the survey was to document the nearest resident, milk producing animal and garden of greater than 500 ft 2 in each of the sixteen 22 1/2 degree sectors around the site. There were no changes required to the BNGS REMP, as a result of this survey. The results of this survey are summarized below.-15-22 of 206 Distance in Miles from the BNGS Vent Stacks Sector Residence Livestock Milk Farm Miles Miles Miles A N 1.3 5.0 12.8 B NNE 2.0 1.5 C NE 1.1 1.9 D ENE 1.3 2.3 E E 1.3 3.5 F ESE 1.4 1.5 G SE 1.3 4.5 H SSE 0.8 3.2 J S 0.7 4.0 K SSW 0.7 2.2 L SW 0.7 2.0 M WSW 1.6 0.4 4.7 N W 1.8 2.5 P WNW 0.9 3.3 Q NW 1.4 4.0 -R NNW 0.9 1.4 5.0 E. Errata Data There is no errata data for 2008.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 DOE's 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 QC requirements, which are based on the DOE MAPEP criteria.2. ERA Evaluation Criteria ERA's evaluation report provides an acceptance range for control and warning limits with associated flag values. ERA's acceptance limits are established per the USEPA, NELAC, state specific PT-16-23 of 206 program requirements or ERA's SOP for the Generation of Performance Acceptance Limits, as applicable.

The acceptance limits are either determined by a regression equation specific to each analyte or a fixed percentage limit promulgated under the appropriate regulatory document.3. DOE Evaluation Criteria MAPEP's evaluation report provides an acceptance range with associated flag values.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.

For the primary laboratory, 16 out of 18 analytes met the specified acceptance criteria.

Two samples did not meet the specified acceptance criteria for the following reasons: 1. Teledyne Brown Engineering's Analytics December 2008 Sr-89 in milk result of 18.0 pCi/L was higher than the known value of 12.6 pCi/L, resulting in a found to known ratio of 1.43. NCR 09-02 was initiated to investigate this failure.2. Teledyne Brown Engineering's Analytics' ERA Quik Response water sample January 2008 Sr-89 result of 37.33 pCi/L exceeded the upper acceptance limit of 25.2 pCi/L. No cause could be found for the failure. Studies bracketing these results, RAD 71 and RAD 72 had acceptable Sr-89 results. NCR 08-03-17-24 of 206 APPENDIX A RADIOLOGICAL ENVIRONMENTAL MONITORING REPORT

SUMMARY

25 of 206 26 of 206 TABLE A-1 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANNUAL

SUMMARY

FOR BYRON NUCLEAR GENERATION STATION, 2008 Name of Facility:

BYRON DOCKET NUMBER: 50-454 & 50-455 Location of Facility:

BYRON; IL REPORTING PERIOD: 2008 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 (PCI/LITER)

GR-B 23 H-3 8 GAMMA MN-54 23 4 5.2 (12/12)(3.5/6.4)200 <LLD 15 <LLD.15 <LLD 30 <LLD 4.9 (10/11)(3.3/5.7)<LLD 5.2 (12/12)(3.5/6.4)BY- 12 INDICATOR 0 OREGON POOL OF ROCK RIVER -DOWNSTREAM

4.5 MILES

SSW OF SITE<LLD<LLD CO-58 FE-59 CO-60 0 0 0<LLD 0I 0., O 15 <LLD<LLD* 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-i RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANNUAL

SUMMARY

FOR BYRON NUCLEAR GENERATION STATION, 2008 Name of Facility:

BYRON DOCKET NUMBER: 50-454 & 50-455 Location of Facility:

BYRON; IL REPORTING PERIOD: 2008 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 (PCI/LITER)

ZN-65 NB-95 ZR-95 23 1-131 30 <LLD 15 <LLD 30 <LLD 15 <LLD 15 <LLD 18 <LLD 60 <LLD<LLD<LLD<LLD<LLD<LLD<LLD<LLD 0 0 CS-134 CS-137 BA-140 0'0 O 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, 2008 Name of Facility:

BYRON DOCKET NUMBER: 50-454 & 50-455 Location of Facility:

BYRON; IL REPORTING PERIOD: 2008 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 (PCI/LITER)

GROUND WATER (PCI/LITER)

LA-140 H-3 23 24 24 15 <LLD 200 <LLD<LLD NA GAMMA MN-54 CO-58 15 <LLD 15 <LLD 30 <LLD 15 <LLD NA NA 0 0 0 FE-59 CO-60 NA t'J 0 t0 NA* 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, 2008 Name of Facility:

BYRON DOCKET NUMBER: 50-454 & 50-455 Location of Facility:

BYRON; IL REPORTING PERIOD: 2008 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 (PCI/LITER)

ZN-65 24 30 <LLD NA 0 NB-95 ZR-95 1-131 15 <LLD 30 <LLD 15 <LLD 15 <LLD 18 <LLD 60 <LLD NA CS-134 CS-137 BA- 140 0 NA NA NA NA NA 0 0 0 0 0 I'-.* 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, 2008 Name of Facility:

BYRON DOCKET NUMBER: 50-454 & 50-455 Location of Facility:

BYRON; IL REPORTING PERIOD: 2008 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 (PCI/LITER)

FISH (PCI/KG WET)LA-140 GAMMA MN-54 24 15 <LLD NA 0 8 CO-58 FE-59 CO-60 ZN-65 130 <LLD 130 <LLD 260 <LLD 130 <LLD 260 <LLD<LLD<LLD<LLD<LLD<LLD 0 0 0 0 0 tN)* 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-i RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANNUAL

SUMMARY

FOR BYRON NUCLEAR GENERATION STATION, 2008 Name of Facility:

BYRON DOCKET NUMBER: 50-454 & 50-455 Location of Facility:

BYRON; IL REPORTING PERIOD: 2008 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 (PCI/KG WET)NB-95 ZR-95 CS-134 CS-137 BA-140 LA- 140 8 NA <LLD NA <LLD 130 <LLD 150 <LLD NA <LLD NA <LLD<LLD 0<LLD<LLD<LLD<LLD<LLD 0 0 0 0 0 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-i RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANNUAL

SUMMARY

FOR BYRON NUCLEAR GENERATION STATION, 2008 Name of Facility:

BYRON DOCKET NUMBER: 50-454 & 50-455 Location of Facility:

BYRON; IL REPORTING PERIOD: 2008 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 (PCI/KG DRY)GAMMA MN-54 4 CO-58 FE-59 CO-60 NA <LLD NA <LLD NA <LLD NA <LLD NA <LLD NA NA NA NA 0 0 0 0 ZN-65 NA 0 NB-95 0-b NA <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-i RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANNUAL

SUMMARY

FOR BYRON NUCLEAR GENERATION STATION, 2008 Name of Facility:

BYRON DOCKET NUMBER: 50-454 & 50-455 Location of Facility:

BYRON; IL REPORTING PERIOD: 2008 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 (PCIiKG DRY)ZR-95 CS-134 CS-137 BA-140 LA-140 4 NA <LLD 150 <LLD 180 158 (3/4)(60/320)NA <LLD NA <LLD NA NA NA NA 0 0 190 (2/2)(60/320)BY-12 INDICATOR 0 OREGON POOL OF ROCK RIVER -DOWNSTREAM

4.5 MILES

SSW OF SITE NA 0 AIR PARTICULATE (E-3 PCI/CU.METER)

GR-B 416 10 20 (364/364)(5/42)20 (52/52)(8/37)21 (52/52)(7/42)BY-06 INDICATOR OREGON 4.7 MILES SSW OF SITE 0-I-* 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-i RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANNUAL

SUMMARY

FOR BYRON NUCLEAR GENERATION STATION, 2008 Name of Facility:

BYRON DOCKET NUMBER: 50-454 & 50-455 Location of Facility:

BYRON; IL REPORTING PERIOD: 2008 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 (E-3 PCI/CU.METER)

GAMMA MN-54 32 CO-58 FE-59 CO-60 ZN-65 NB-95 NA <LLD NA <LLD NA <LLD NA <LLD NA <LLD NA <ILD<LLD<LLD<LLD<LLD<LLD<LLD 0 0 0 0 0 O I',Q 0N* 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-i RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANNUAL

SUMMARY

FOR BYRON NUCLEAR GENERATION STATION, 2008 Name of Facility:

BYRON DOCKET NUMBER: 50-454 & 50-455 Location of Facility:

BYRON; IL REPORTING PERIOD: 2008 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 (E-3 PCI/CU.METER)

ZR-95 32 CS-134 CS-137 BA-140 LA- 140 GAMMA 1-131 NA <LLD 50 <LLD 60 <LLD NA <LLD NA <LLD<LLD<LLD<LLD<LLD<LLD 0 0 0 0 0 AIR IODINE (E-3 PCI/CU.METER) 416 70 <LLD<LLD 0 0-ON* 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-i RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANNUAL

SUMMARY

FOR BYRON NUCLEAR GENERATION STATION, 2008 Name of Facility:

BYRON DOCKET NUMBER: 50-454 & 50-455 Location of Facility:

BYRON; IL REPORTING PERIOD: 2008 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 (PCI/LITER) 1-131 55 55<LLD<LLD 0 GAMMA MN-54 CO-58 FE-59 CO-60 ZN-65 NA <LLD NA <LLD NA <LLD NA <LLD NA <LLD<LLD<LLD<LLD 0<LLD 0-0 ON<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-i RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANNUAL

SUMMARY

FOR BYRON NUCLEAR GENERATION STATION, 2008 Name of Facility:

BYRON DOCKET NUMBER: 50-454 & 50-455 Location of Facility:

BYRON; IL REPORTING PERIOD: 2008 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 (PCI/LITER)

NB-95 ZR-95 55 CS-134 NA <LLD NA <LLD 15 <LLD 18 <LLD 60 <LLD 15 <LLD<LLD<LLD 0 0<LLD<LLD CS-137 BA-140 LA- 140<LLD<LLD 0 0 0 tC* 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, 2008 Name of Facility:

BYRON DOCKET NUMBER: 50-454 & 50-455 Location of Facility:

BYRON; IL REPORTING PERIOD: 2008 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 (PCI/KG WET)GAMMA MN-54 10 CO-58 FE-59 CO-60 ZN-65 NB-95 NA <LLD NA <LLD NA <LLD NA <LLD NA <LLD NA <LLD<LLD<LLD<LLD<LLD<LLD<LLD 0 0 0 0 ON* 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, 2008 Name of Facility:

BYRON DOCKET NUMBER: 50-454 & 50-455 Location of Facility:

BYRON; IL REPORTING PERIOD: 2008 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 (PCI/KG WET)ZR-95 10 1-131 CS-134 CS-137 BA-140 LA-140 NA <LLD 60 <LLD 60 <LLD 80 <LLD NA <LLD<LLD<LLD<LLD<LLD 0 0 0 0 0 0 0<LLD NA <LLD<LLD O 0o DIRECT RADIATION TLD-QUARTERLY 342 NA 22.9 19.4 (MILLI-ROENTGEN/QTR.)

(334/334)

(8/8)(16/30) (17/21)* 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)26.7 (3/3)(24/29)BY-105-1 INDICATOR 1.4 MILES E APPENDIX B LOCATION DESIGNATION, DISTANCE & DIRECTION, AND SAMPLE COLLECTION

& ANALYTICAL METHODS B-1 41 of 206 B-2 42 of 206 TABLE B-1: Radiological Environmental Monitoring Program -Sampling Locations, Distance and Direction, Byron Nuclear Generating Station, 2008 Location Location Description Distance & Direction From Site A. Surface Water BY-12 BY-29 Oregon Pool of Rock River, Downstream Byron, Upstream (control)B. Ground/Well Water BY-14-1 BY-18 BY-32 BY-35 BY-36 BY-37 3200 North German Church Road McCoy Farmstead Ron Wolford Well Vancko Well Blanchard Well Alexander Well C. Milk BY-20-1 BY-26-1 BY-30 BY-30-1 BY-38 Ron Snodgrass Farm Dennis Herbert (control)Don Roos Dairy Ebert Farm Larson Goat Farm D. Air Particulates

/ Air Iodine BY-01 BY-04 BY-06 BY-08 BY-21 BY-22 BY-23 BY-24 Byron Paynes Point Oregon Leaf River (control)Byron Nearsite North Byron Nearsite East-Southeast Byron Nearsite South Byron Nearsite Southwest Byron, Upstream (control)Byron, Discharge 4.5 miles SSW 3.0 miles N 1.0 miles SSE 0.7 miles SW 1.8 miles W 2.0 miles WNW 1.0 miles NW 1.8 miles WNW 4.7 miles WSW 12.8 miles N 5.3 miles SE 5.0 miles NNW 5.0 miles ENE 3.0 miles N 5.0 miles SE 4.7 miles SSW 6.8 miles WNW 0.3 miles N 0.4 miles ESE 0.6 miles S 0.6 miles SW 3.0 miles N 2.2 miles WNW 4.5 miles SSW 0.6 miles W 4.9 miles ENE 4.9 miles SE 3.4 miles SW 0.6 miles SW 6.8 miles ENE E. Fish BY-29 BY-31 F. Sediment BY-12 BY-34 G. Vegetation Quadrant 1 Quadrant 2 Quadrant 3 Quadrant 4 Control Oregon Pool of Rock River, Downstream Rock River, Downstream 5186 N. Cox Road, Stillman Valley 6402 Brick Road, Oregon 555 Park Road, Oregon Met Tower, Byron 8631 11th Street, Davis Junction H. Environmental Dosimetry

-TLD Inner Ring BY-101-1 and-2 BY-102-1 BY- 102-2 0.3 miles N 0.9 miles NNE 1.0 miles NNE B-3 43 of 206 TABLE B-1: Radiological Environmental Monitoring Program -Sampling Locations, Distance and Direction, Byron Nuclear Generating Station, 2008 Location Location Description Distance & Direction From Site BY-103-1 and -2 BY-103-3 BY-104-1 and -2 BY-104-3 BY-1 05-1 and -2 BY-106-1 and -2 BY-107-1 and -2 BY- 107-3 BY-108-1 BY-108-2 BY-109-1 and -2 BY-110-1 and -2 BY-111-3 BY-111-4 BY-1 12-3 and -4 BY-113-1 and -2 BY-1 14-1 and -2 BY-1 15-1 and -2 BY-116-1 and -2 BY-116-3 Outer Ring BY-201-3 BY-201-4 BY-202-1 BY-202-2 BY-203-1 BY-203-2 BY-204-1 BY-204-2 BY-205-1 and -2 BY-206-1 BY-206-2 BY-207-1 BY-207-2 BY-208-1 BY-208-2 BY-209-1 and -4 BY-210-3 and -4 BY-211-1 and -4 BY-212-1 and -4 BY-213-1 BY-213-4 BY-214-1 BY-214-4 BY-215-1 BY-215-4 BY-216-1 BY-216-2 1.7 miles NE 0.43 miles NE 1.5 miles ENE 0.36 miles ENE 1.3 miles E 1.4 miles ESE 1.4 miles SE 0.47 miles SE 0.7 miles SSE 0.6 miles SSE 0.6 miles S 0.6 miles SSW 0.7 miles SW 0.8 miles SW 0.8 miles WSW 0.7 miles W 0.8 miles WNW 1.0 miles NW 1.4 miles NNW 0.85 miles NNW 4.5 miles N 4.4 miles N 4.3 miles NNE 4.8 miles NNE 4.8 miles NE 4.7 miles NE 4.2 miles ENE 4.1 miles ENE 3.8 miles E 4.1 miles ESE 4.4 miles ESE 4.2 miles SE 3.6 miles SE 4.0 miles SSE 3.7 miles SSE 3.7 miles S 3.9 miles SSW 4.9 miles SW 4.7 miles WSW 4.7 miles W 4.6 miles W 4.6 miles WNW 4.9 miles WNW 5.3 miles NW 5.2 miles NW 4.6 miles NNW 4.8 miles NNW.B-4 44 of 206 TABLE B-1: Radiological Environmental Monitoring Program -Sampling Locations, Distance and Direction, Byron Nuclear Generating Station, 2008 Location Location Description Distance & Direction From Site Special Interest BY-301 -1 BY-302-1 BY-314-1 Other BY-01-1 and -2 BY-04-1 and -2 BY-06-1 and -2 BY-21-1 and-2 BY-22-1 and -2 BY-23-1 and -2 BY-24-1 and -2 0.2 miles N 0.2 miles N 0.2 miles WNW 3.0 miles N 5.0 miles SE 4.7 miles SSW 0.3 miles N 0.4 miles ESE 0.6 miles S 0.6 miles SW 6.8 miles WNW Control BY-08-1 and -2 B-5 45 of 206 TABLE B-2: Radiological Environmental Monitoring Program -Summary of Sample Collection and Analytical Methods, Byron Nuclear Generating Station, 2008 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.Env. Inc., GS-01 Determination of gamma emitters by gamma spectroscopy Surface Water Gross Beta Monthly composite from TBE, TBE-2008 Gross Alpha and/or gross beta activity in weekly grab samples. various matrices Env. Inc., W(DS)-01 Determination of gross alpha and/or gross beta in water (dissolved solids or total residue)Surface Water Tritium Quarterly composite from TBE, TBE-201 1 Tritium analysis in drinking water by liquid weekly grab samples. scintillation Env. Inc., T-02 Determination of tritium in water (direct method)Ground Water Gamma Spectroscopy Quarterly grab samples. TBE, TBE-2007 Gamma emitting radioisotope analysis Env. Inc., GS-01 Determination of gamma emitters by gamma spectroscopy Ground Water Tritium Quarterly grab samples. TBE, TBE-2011 Tritium analysis in drinking water by liquid scintillation Env. Inc., T-02 Determination of tritium in water (direct method)Fish Gamma Spectroscopy Semi-annual samples TBE-2007 Gamma emitting radioisotope analysis collected via electroshocking or other Env. Inc., GS-01 Determination of gamma emitters by gamma techniques spectroscopy Sediment Gamma Spectroscopy Semi-annual grab TBE, TBE-2007 Gamma emitting radioisotope analysis samples Env. Inc., GS-01 Determination of gamma emitters by gamma spectroscopy 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 Env. Inc., AP-02 Determination of gross alpha and/or gross beta in air particulate filters Air Particulates Gamma Spectroscopy Quarterly composite of TBE, TBE-2007 Gamma emitting radioisotope analysis each station Env. Inc., GS-01 Determination of gamma emitters by gamma spectroscopy Air Iodine Gamma Spectroscopy One-week composite of TBE, TBE-2007 Gamma emitting radioisotope analysis continuous air sampling through charcoal filter Env. Inc., 1-131-02 Determination of 1-131 in charcoal canisters by gamma spectroscopy (batch method)Milk 1-131 Bi-weekly grab sample TBE, TBE-2012 Radioiodine in various matrices when cows are on pasture. Monthly all Env. Inc., 1-131-01 Determination of 1-131 in milk by anion other times exchange Milk Gamma Spectroscopy Bi-weekly grab sample TBE, TBE-2007 Gamma emitting radioisotope analysis when cows are on pasture. Monthly all Env. Inc., GS-01 Determination of gamma emitters by gamma other times spectroscopy Vegetation Gamma Spectroscopy Annual grab samples. TBE, TBE-2007 Gamma emitting radioisotope analysis Env. Inc., GS-01 Determination of gamma emitters by gamma spectroscopy TLD Thermoluminescence Quarterly TLDs Global Dosimetry Dosimetry comprised of two Global Dosimetry CaF 2 elements.B-6 46 of 206 Figure B-1 Inner and Outer Ring TLD Locations of the Byron Nuclear Generating Station, 2008 B-7 47 of 206 0~p~, ~~2.N ItEFIEPMM-:

ULIT Ti'ATE 3EOS.EUQCUUrYYVA.LEY QUADRANGE ORT7A UNM'ES UENES IR A a 1! 1W UL*

L.TON Figure B-2 Onsite Air Sampling Locations of the Byron Nuclear Generating Station, 2008 B-8 48 of 206 BYO fr". T2 LEAF RVm Mr.MOR C 1 2 3 4 EMILS I a i a KM& Air Safllimg Locxik'v K B)ron Swaimc Figure B-3 Offsite Air Sampling Locations of the Byron Nuclear Generating Station, 2008 B-9 49 of 206 30-1 a LEAP IIimF 81 0iS Mr.T 0 1 G ii ii -2 4 9 5 UIIU4 4 a too 0*9 FMN A MIX+ WAlER Figure B-4 Ingestion and Waterborne Exposure Pathway Sampling Locations of the Byron Nuclear Generating Station, 2008 B-10 50 of 206

-, APPENDIX C DATA TABLES AND FIGURES PRIMARY LABORATORY 51 of 206 52 of 206 TABLE C-1.1 CONCENTRATIONS OF GROSS BETA IN SURFACE WATER SAMPLES COLLECTED IN THE VICINITY OF BYRON NUCLEAR GENERATING STATION, 2008 RESULTS IN UNITS OF PCI/LITER

+/- 2 SIGMA COLLECTION PERIOD BY-12 BY-29 01/08/08 -01/15/08 02/05/08 -02/05/08 03/11/08 04/01/08 05/06/08 06/03/08 07/01/08 08/05/08 09/02/08 10/07/08 11/04/08 12/02/08-03/24/08-04/29/08-05/27/08-06/24/08-07/28/08-08/26/08-09/30/08 10/28/08-11/25/08-12/02/08 5.9 +/- 1.9 3.5 +/- 2.1 6.2 +/- 2.6 5.3 +/- 1.9 5.9 +/- 2.9 5.9 +/- 2.1 4.3 +/- 2.1 4.9 +/- 2.6 4.9 +/- 2.0 5.3 +/- 2.2 3.7 +/- 2.0 6.4 +/- 2.1 5.2 +/- 1.9 4.7 +/- 1.8 (1)5.3. +/- 2.6 5.7 +/- 2.0 5.4 +/- 2.9 5.4 +/- 2.1 5.2 +/- 2.2< 3.7 4.3 +/- 2.0 4.7 +/- 2.2 4.8 +/- 2.1 3.3 +/- 1.9 4.9 +/- 1.4 MEAN TABLE C-I.2 CONCENTRATIONS OF TRITIUM IN SURFACE WATER SAMPLES COLLECTED IN THE VICINITY OF BYRON NUCLEAR GENERATING STATION, 2008 RESULTS IN UNITS OF PCI/LITER

+/- 2 SIGMA COLLECTION PERIOD 01/08/08 -03/24/08 04/01/08 -06/24/08 07/01/08 -09/30/08 10/07/08 -12/30/08 BY-12 BY-29* 169* 195< 143< 178< 169< 190< 135< 180 MEAN* THE MEAN AND 2 STANDARD DEVIATION VALUES ARE CALCULATED USING THE POSITIVE VALUES (1) SEE PROGRAM EXCEPTIONS SECTION FOR EXPLANATION C-I 53 of 206 TABLE C-1.3 CONCENTRATIONS OF GAMMA EMITTERS IN SURFACE WATER SAMPLES COLLECTED IN THE VICINITY OF BYRON NUCLEAR GENERATING STATION, 2008 RESULTS IN UNITS OF PCI/LITER

+/- 2 SIGMA STC COLLECTION PERIOD BY-12 01/08/08 -01/29/08 02/05/08 -02/05/08 03/03/08 -03/24/08 04/01/08 -04/29/08 05/06/08 -05/27/08 06/03/08 -06/24/08 07/01/08 -07/28/08 08/05/08 -08/26/08 09/02/08 -09/30/08 10/07/08 -10/28/08 11/04/08 -11/25/08 12/02/08 -12/30/08 Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 1-131 Cs-134 Cs-137 Ba-140 La-140<1<2<3<2<2<2<2<2<1<2<1<1<2<2<3<2<2<2<2<2<1<2<1<1<4<4<5<4<5<6<5<4<3<5<3<3<1<2<2<2<2<2<2<2<1<1<1<1<3<3<5<3<4<5<4<3<2<3<2<2<2<2<3<2<2<3<2<2<1<2<1<1<3<4<6<3<4<4<4<3<2<4<3<2< 12< 14< 13< 11<8< 15< 12< 14< 11<9<8< 11<1<2<2<2<1<2<2<2<1<2<1<1<1<2<3<2<2<2<2<2<1<2<1<1 MEAN< 18< 21< 25< 18< 16< 27< 21< 22< 16< 46< 54< 17< 18< 31< 21< 16< 24< 21< 21< 18< 45< 49< 13<6<7<8<6<5<9<7<7<5< 12< 13<5 BY-29 01/08/08 -01/15/08 02/05/08 -02/05/08 (1)03/11/08 -03/24/08 04/01/08 -04/29/08 05/06/08 -05/27/08 06/03/08 -06/24/08 07/01/08 -07/28/08 08/05/08 -08/26/08 09/02/08 -09/30/08 10/07/08 -10/28/08 11/04/08 -11/25/08 12/02/08 -12/02/08<1 <1 <3 <1 <2 <1 <2 <14<1 <1<4<2<2<2<2<2<1<2<1<0<4<2<2<2<2<2<1<2<1<0<9<5<4<5<4<4<3<6<3<1<5<2<2<2<2<2<1<2<1<1<8<4<4<4<4<3<3<3<2<1<4<2<2<3<2<2<1<2<1<1<8<4<3<4<4<3<3<4<2<1< 14< 12<9< 15< 13< 14< 12<8<8< 14<3<2<2<2<2<1<1<1<1<0<4<2<2<2<2<2<1<2<1<0< 10<6<5<7<6<6<5< 14< 13<4 ON MEAN (1) SEE PROGRAM EXCEPTIONS SECTION FOR EXPLANATION TABLE C-I1.1 CONCENTRATIONS OF TRITIUM IN GROUND WATER SAMPLES COLLECTED IN THE VICINITY OF BYRON NUCLEAR GENERATING STATION, 2008 RESULTS IN UNITS OF PCI/LITER

+/- 2 SIGMA COLLECTION BY-14-1 PERIOD 01/08/08 -01/08/08 < 187 04/08/08 -04/08/08 < 171 07/08/08 -07/08/08 < 171 10/14/08 -10/14/08 < 146 BY-18 BY-32 BY-35 BY-36 BY-37< 190< 170< 168* 146< 190< 169< 169* 138< 192< 171* 166< 139< 196< 169< 167* 148< 194< 171< 165* 134 MEAN C-3 55 of 206 TABLE C-1I.2 CONCENTRATIONS OF GAMMA EMITTERS IN GROUND WATER SAMPLES COLLECTED IN THE VICINITY OF BYRON NUCLEAR GENERATING STATION, 2008 RESULTS IN UNITS OF PCI/LITER

+/- 2 SIGMA STC COLLECTION PERIOD BY-14-1 01/08/08 -01/08/08 04/08/08 -04/08/08 07108108 -07/08/08 10/14/08 -10/14/08 Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 1-131 Cs-134 Cs-137 Ba-140 La-140 6 4 4 2 MEAN BY-18 01/08/08 04/08/08 07/08/08 10/14/08 C.)MEAN BY-32 01/08/08 04/08/08 07/08/08 10/14/08 MEAN BY-35 01/08/08 04/08/08 07/08/08 10/14/08 MEAN-01/08/08-04/08/08-07/08/08-10/14/08-01/08/08-04/08/08-07/08/08-10/14/08-01/08/08-04/08/08-07/08/08 10/14/08 6 5 4 2 8 4 4 3 6 5 5 2 6 5 5 3 13 7 9 7 10 11 9 5 15 9 9 6 13 8 9 5 3 3 4 2 7 5 4 2 13 7 7 5 10 9 7 5 14 8 9 4 12 8 7 4 7 4 4 3 6 5 5 2 11 7 8 5 7 10 8 4 10 5 13 15 10 9 14 14 5 3 4 3 5 5 4 2 5 4 4 3 5 6 5 2 29 16 29 23 23 26 34 21 31 19 32 25 32 20 30 21 11 5 9 8 12 8 9 8 5 5 4 2 6 6 4 2 7 4 4 2 7 5 4 3 7 4 4 2 11 9 8 5 10 7 7 4 12 8 15 15 11 8 14 12 5 4 4 2 7 5 4 2 7 4 4 2 8 7 12 7 9 7 10 7 6 4 3 2 6 4 4 2 5 4 4 20 tO TABLE C-1I.2 CONCENTRATIONS OF GAMMA EMITTERS IN GROUND WATER SAMPLES COLLECTED IN THE VICINITY OF BYRON NUCLEAR GENERATING STATION, 2008 RESULTS IN UNITS OF PCI/LITER

+/- 2 SIGMA STC COLLECTION Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 1-131 Cs-134 Cs-137 Ba-140 La-140 PERIOD BY-36 01/08/08 04/08/08 07/08/08 10/14/08 MEAN-01/08/08-04/08/08-07/08/08-10/14/08-01/08/08-04/08/08-07/08/08-10/14/08< 5< 4< 4< 2< 7< 4< 3< 1< 4< 5< 4< 2< 5< 4< 3< 1<10 <5<9 <4< 8< 9< 7< 4< 8< 5< 3< 2< 5< 5< 4< 2< 8ý< 9< 7< 4< 12< 6< 7< 2< 10< 9< 13* 12< 4< 5< 4< 2< 5< 5< 4< 2< 7< 3< 4< 1< 24< 23< 27< 22< 35* 21< 26< 15< 8< 6< 9< 6< 13< 5< 10< 5 BY-37 01/08/08 04/08/08 07/08/08 10/14/08<14 <6<8 <4<10 <7<9 <4<7 <4<2 <1< 13< 7< 12<11< 6< 4< 3< 1< 8< 3< 3< 1 MEAN CJ ON TABLE C-I11.1 CONCENTRATIONS OF GAMMA EMITTERS IN FISH SAMPLES COLLECTED IN THE VICINITY OF BYRON NUCLEAR GENERATING STATION, 2008 RESULTS IN UNITS OF PCI/KG WET +/- 2 SIGMA STC COLLECTION PERIOD Mn-54 Co-58 Fe-59 Co-60 .Zn-65 Nb-95 Zr-95 Cs-134 Cs-137 Ba-140 La-140 BY-29 Freshwater Drum Silver Redhorse River Carpsucker Smallmouth Bass 05/20/08 05/20/08 10/21/08 10/21/08< 53< 44* 50< 54< 65< 47< 48< 66< 170* 125* 148* 155< 41< 45< 39< 55< 113< 88< 106< 113 75 57 57 66< 124< 98< 105< 122< 45< 39<41< 55< 44< 39< 50< 57< 1510< 1240< 792< 1020* 372< 373* 269* 323 MEAN BY-31 Freshwater Drum Silver Redhorse Channel Catfish Common Carp 05/20/08 05/20/08 10/21/08 10/21/08< 44< 46* 62* 40< 62< 58< 58< 58* 144< 147* 136* 148< 50< 63< 58< 45 130 102 97 95 68 71 64 63< 114< 128< 97< 114* 46< 41.< 43< 45< 39< 48< 44< 49< 1400< 1350< 592< 718* 297* 481< 335< 383 MEAN ON TABLE C-IV.1 CONCENTRATIONS OF GAMMA EMITTERS IN SEDIMENT SAMPLES COLLECTED IN THE VICINITY OF BYRON NUCLEAR GENERATING STATION, 2008 RESULTS IN UNITS OF PCI/KG DRY +/- 2 SIGMA STC COLLECTION Mn-54 PERIOD BY-12 05/26/08 < 55 10/20/08 < 54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 Cs-134 Cs-137 Ba-140 La-140< 66 < 142 < 50 < 118<65 < 163 <48 < 124< 75< 75< 100< 113< 48< 50 320 +/- 67 < 408 < 142 60 +/- 34 < 1190 < 330 MEAN 190 +/- 367 BY-34 05/26/08 < 86 < 87 < 207 10/20/08 < 30 < 33 < 96< 72 < 234< 32 < 64< 100 < 155< 43 < 69< 126< 26 94 +/- 59 < 610< 34 < 640< 195< 174 MEAN 94 +/- 0 0* THE MEAN AND 2 STANDARD DEVIATION VALUES ARE CALCULATED USING THE POSITIVE VALUES TABLE C-V.i CONCENTRATIONS OF GROSS BETA IN AIR PARTICULATE SAMPLES COLLECTED IN THE VICINITY OF BYRON NUCLEAR GENERATING STATION, 2008 RESULTS IN UNITS OF E-3 PCI/CU METER +/- 2 SIGMA GROUP I GROUP 11 I GROUP III COLLECTION PERIOD 01/02/08 01/08/08 01/15/08 01/22/08 01/29/08 02/05/08 02/12/08 02/19/08 02/25/08 03/04/08 03/10/08 03/18/08 03/24/08 04/01/08 04/08/08 04/16/08 04/22/08 04/29/08 05/06/08 05/13/08 05/20/08 05/27/08 06/03/08 06/10/08 06/17/08 06/24/08 07/01/08 07/08/08 07/15/08 07/22/08 07/28/08 08/05/08 08/12/08 08/19/08 08/26/08 09/02/08 09/09/08 09/16/08 09/23/08 09/30/08 10/07/08 10/14/08 10120/08 10/28/08 11/04/08 1 1/11/08 11/18/08 11/25/08 12/02/08 12/09/08 12/16108 12/22/08 01/08/08 01/15/08 01/22/08 01/29/08 02/05/08 02/12/08 02/19/08 02/25/08 03/04/08 03/10/08 03/18/08 03/24/08 04/01/08 04/08/08 04/16/08 04/22/08 04/29/08 05/06/08 05/13/08 05/20/08 05/27/08 06/03/08 06/10/08 06/17/08 06/24/08 07/01/08 07/08/08 07/15/08 07/22/08 07/28/08 08/05/08 08/12/08 08/19/08 08/26/08 09/02/08 09/09/08 09/16/08 09/23/08 09/30/08 10/07/08 10/14/08 10/20/08 10/28/08 11/04/08 11/11/08 11/18/08 11/25/08 12/02/08 12/09/08 12/16/08 12/22/08 12/30/08 BY-21 21 +/- 5 29 +/- 5 27 +/- 5 34 +/- 5 22 +/- 5 30 +/- 5 26 +/- 5 16 +/- 4 23 +/- 5 22 +/- 5 18 +/- 4 16 +/- 4 13 +/- 4 17 +/-4 9+/-3 23 +/-5 19 +/-4 18 +/-4 13 +/-4 14 +/-4 8+/-3 19 +/-4 10 +/-4 15 +/-4 19 +/-4 12 +/-4 15 +/-4 9+/-4 19 +/-5 16 +/-4 19 +/-4 19 +/-4 22 +/-5 18 +/- 4 35 +/- 5 15 +/- 4 14 +/- 4 35 +/- 5 36 +/- 6 22 +/- 5 13 +/- 4 18 +/- 5 11 +/-3 32 +/-5 16 +/-4 20 +/-5 23 +/-5 17 +/-4 23 +/-5 28 +/-5 35 +/-5 30 +/-5 BY-22 23 +/- 5 29 +/- 5 27 +/-5 35 +/-5 21 +/-4 28 +/-5 26 +/-5 12 +/- 4 22 +/- 5 25 +/- 5 15 +/- 4 14 +/- 4 13 +/- 4 20 +/- 4 8+/-3 26 +/-5 19 +/-4 23 +/-4 13 +/-4 12 +/-4 5+/-3 12 +/-4 13 +/-4 14 +/-4 13 +/-4 12 +/-4 11 +/-4 13 +/-4 17 +/-5 21 +/-5 14 +/-4 15 +/-4 23 +/-5 18 +/- 4 27 +/- 5 16 +/- 4 14 +/-4 33 +/-5 28 +/-5 16 +/-4 16 +/-4 1*5 +/-5 13 +/-4 34 +/-5 18 +/- 4 13 +/- 4 20 +/- 4 15 +/- 4 18 +/- 4 21 +/- 5 29 +/- 5 33 +/- 5 BY-23 25 +/- 5 36 +/- 5 30 +/- 5 30 +/- 5 14 +/- 4 26 +/- 5 22 +/- 5 15 +/- 4 18 +/- 5 24 +/- 5 17 +/- 4 12 +/- 4 13 +/- 4 19 +/- 4 8+/-3 23 +/-5 20 +/-4 26 +/-5 11 +/-4 9+/-3 10 +/-4 15 +/-4 12 +/-4 10 +/-4 11 +/-4 7+/-4 12 +/-4 10 +/-4 15 +/-5 17 +/-4 13 +/-4 16 +/-4 19 +/-5 14 +/-4 25 +/-5 15 +/-4 10 +/-4 29 +/-5 30 +/-5 15 +/- 4 18 +/- 4 19 +/- 5 12 +/- 4 33 +/- 5 17 +/-4 15 +/-4 15 +/-4 20 +/-4 21 +/-5 25 +/-5 29 +/-5 28 +/-5 BY-24 24 +/- 5 38 +/- 6 31 +/- 5 36 +/- 5 21 +/- 4 28 +/- 5 26 +/- 5 17. +/- 4 18 +/- 5 27 +/- 5 17 +/- 4 10 +/- 4 14 +/- 4 16 +/- 4 7+/-3 24 +/-5 13 +/-4 19 +/-4 16 +/-4 12 +/-4 10 +/-4 16 +/-4 13 +/-4 9+/-4 13 +/-4 12 +/-4 12 +/-4 10 +/-4 21 5 18 +/-4 16 +/-4 17 +/-4 23 +/-5 17 +/- 4 30 +/- 5 17 +/- 4 12 +/- 4 35 +/- 5 35 +/- 6 23 +/- 5 21 +/- 4 17 +/- 5 13 +/- 4 35 +/- 5 15 +/- 4 18 +/- 4 21 +/- 4 23 +/- 4 21 +/- 5 23 +/- 5 35 +/- 5 27 +/- 5 BY-01*20 +/- 5 32 +/- 5 27 +/- 5 35 +/- 5 24 +/- 5 25 +/- 5 23 +/- 5 19 +/- 5 21 +/- 4 22 +/- 5 19 +/- 5 11 +/-4 13 +/-4 21 +/-4 9+/-3 18 +/-5 16 +/- 4 20 +/- 4 17 +/- 4 12 +/- 4 7+/-3 16 +/-4 10 +/-4 9+/-4 19 +/-4 12 +/-4 12 +/-4 10 +/-4 18 +/-5 17 +/-5 16 +/-4 20 +/-4 22 +/-5 15 +/-4 32 +/-5 17 +/- 4 14 +/- 4 37 +/- 5 38 +/- 6 22 +/- 5 20 +/- 4 17 +/- 5 11 +/-3 37 +/-5 13 +/-4 20 +/-5 20 +/-4 24 +/-5 24 5 25 +/-5 35 +/-6 28 +/-4 BY-04 26 +/- 5 30 +/- 5 31 +/- 5 31 +/- 5 22 +/- 5 28 +/- 5 30 +/- 5 21 +/- 5 19 +/- 4 20 +/- 5 21 +/- 4 12 +/- 4 14 +/- 4 22 +/- 4 10 +/- 3 23 +/- 5 17 +/-4 19 +/-4 13 +/-4 8+/-3 7+/-3 10 +/- 4 14 +/- 4 11 +/-4 13 +/-4 16 +/-4 11 +/-4 11 +/-4 17 +/-5 17 +/-4 12 +/- 4 14 +/- 5 21 +/- 5 18 +/- 4 36 +/- 5 20 +/- 4 13 +/- 4 34 +/- 5 31 +/- 5 17 +/- 4 16 +/- 4 18 +/- 5 10 +/- 3 35 +/- 5 15 +/- 4 13 +/- 4 15 +/- 4 17 +/- 4 20 +/- 5 25 +/- 5 34 +/- 5 34 +/- 5 BY-06 27 +/- 5 42 +/- 6 29 +/- 5 40 +/- 6 20 +/- 4 27 +/- 5 26 +/- 5 16 +/- 5 23 +/- 5 21 +/- 5 19 +/- 4 12 +/- 4 15 +/- 4 21 +/-4 9+/-3 23 +/-5 15 +/-4 21 +/-4 14 +/-4 13 +/-4 7+/-3 15 +/-4 11 +/-4 13 +/-4 14 +/-4 14 +/-4 15 +/-4 9+/-4.19 +/-5 18 +/-4 21 +/-4 16 +/-4 18 +/-4 18 +/-4 31 +/-5 17 +/-4 21 +/-4 33 5 35 +/-5 20 +/- 5 23 +/- 5 19 +/- 5 16 +/- 4 34 +/- 5 17 +/- 4 19 +/- 4 20 +/- 4 20 +/- 4 19 +/- 4 27 +/- 5 31 +/- 5 32 +/- 5 BY-08 24 +/- 5 28 +/- 5 31 +/- 5 34 +/- 5 21 +/- 5 26 +/- 5 24 +/- 5 17 +/- 5 22 +/- 4 20 +/- 5 19 +/- 5 11 +/-4 12 +/-4 20 +/-4 9+/-3 23 +/-5 17 +/-4 18 +/-4 18 +/-4 12 +/-4 8+/-3 12 +/-4 12 +/-4 12 +/-4 13 +/-4 15 +/-4 15 +/-4 8+/-4 17 +/-5 20 +/-5 20 +/-4 19 +/-4 22 +/-5 19 +/-4 29 +/-5 19 +/-4 16 +/-4 34 +/-5 31 +/-5 15 +/-4 19 +/-4 20 5 10 +/-3 33 +/-5 18 +/-4 16 +/-4 17 +/-4 20 +/-4 18 +/-4 26 +/-5 30 +/-5 37 +/-5--- I MEAN 20 +/-15 19 +/-14 18 +/-14 20 +/-16 20 +/-16 19 +/-16 21 +/-15 20 +/-14 C-8 60 of 206 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, 2008 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 PERIOD 01/02/08 -01/29/08 01/29/08-02/26/08 02/26/08-04/01/08 04/01/08-04/29/08 04/29/08-06/03/08 06/03/08 -07/01/08 07/01/08 -07/28/08 07/28/08 -09/02/08 09/02/08 -09/30/08 09/30/08 -10/28/08 10/28/08 -12/02/08 12/02/08 -12/30/08 MIN MAX MEAN+/-2SD 21 38 30 +/- 10 12 30 22 +/- 11 10 27 17 +/- 10 7 26 17 +/- 12 5 26 14 +/- 10 7 19 12 +/- 5 9 21 15 +/- 8 13 35 20 +/- 12 10 36 23 +/- 20 11 23 16 +/- 7 13 35 21 +/- 14 18 35 27 +/- 10 COLLECTION PERIOD 01/02/08 01/29/08 03/03/08 04/01/08 04/29/08 06/03/08 07/01/08 07/28/08 09/02/08 09/30/08 10/28/08 12/02/08 01/29/08 03/04/08 04/01/08 04/29/08 06/03/08 07/01/08 07/28/08 09/02/08 09/30/08 10/28/08 12/02/08 12/30/08 MIN MAX MEAN+/-2SD 20 42 31 +/- 12 16 30 23 +/- 8 11 22 17 +/- 8 9 23 17 +/- 11 7 21 13 +/- 10 9 19 13 +/- 5 9 19 15 +/- 7 12 36 21 +/- 14 13 38 26 +/- 19 10 23 17 +/- 8 13 37 21 +/- 16 19 35 28 +/- 11 7 42 20 +/- 16 PERIOD 01/02/08 01/29/08 03/04/08 04/01/08 04/29/08 06/03/08 07/01/08 07/28/08 09/02/08 09/30/08 10/28/08 12/02/08 COLLECTION 01/29/08 03/04/08 04/01/08 04/29/08 06/03/08 07/01/08 07/28/08 09/02/08 09/30/08 10/28/08 12/02/08 12/30/08 MIN MAX MEAN+/-2SD 24 34 29 +/- 9 17 26 22 +/- 6 11 20 15 +/- 9 9 23 17 +/- 12 8 18 14 +/- 9 12 15 13 +/- 3 8 20 15 +/- 10 19 29 22 +/- 9 16 34 25 +/- 18 10 20 16 +/- 9 16 33 21 +/- 14 18 37 28 +/- 15 8 37 20 +/- 14 01/02/08 -12/30/08 5 38 19 +/- 15 01/02/08 -12/30/08 01/02/08 -12/30/08.0" ON TABLE C-V.3 CONCENTRATIONS OF GAMMA EMITTERS IN AIR PARTICULATE SAMPLES COLLECTED IN THE VICINITY OF BYRON NUCLEAR GENERATING STATION, 2008 RESULTS IN UNITS OF E-3 PCI/CU METER +/- 2 SIGMA Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 STC COLLECTION PERIOD Cs-134 Cs-137 Ba-140 La-140 BY-01 01/02/08 04/01/08 07/01/08 09/30/08 MEAN 0 BY-04 01/02/08 04/01/08 07/01/08 09/30/08 MEAN BY-06 01/02/08 04/01/08 07/01/08 09/30/08 MEAN BY-08 01/02/08 04/01/08 07/01/08 09/30/08 04/01/08 07/01/08 09/30/08 12/30/08 04/01/08 07/01/08 09/30/08 12/30/08 04/01/08 07/01/08 09/30/08 12/30/08 04/01/08 07/01/08 09/30/08 12/30/08<2<3<3<3<2<4<3<3<2<2<4<3<3<4<4<3<5<4< 11<5<4<6< 13<6<3<4<9<5< 18< 19< 50< 13< 13< 24< 45< 20<3<2<3<3<2<4<3<2<9<6<7<8<6<5< 12<5<4<5< 15<6< 10<8< 21<9<9<9< 24< 12<6<9<9< 10<2<3<4<3<2<4<4<4<2<3<2<2<2<3<3<3<1<2<3<3< 580< 754< 32700< 439< 617< 980< 48400< 561< 552< 652< 44300< 410< 275< 364< 12300< 105< 183< 305< 13500< 155< 312< 222< 13900< 132< 417< 491< 10300< 131< 11< 15< 48< 14<2<2<2<3<6<6< 12<7<5<5< 11<5<8<8< 17< 10<3<2<3<3<6 <24<4 <11<7 <11<8< 15<4< 25< 76< 14<3<3<3<9<9< 10<9< 19<5< 14< 29<9< 4 < 4 < 974< 5 < 4 < 1370< 4 < 3 < 51300< 3 < 3 < 366 MEAN'ON TABLE C-V.3 CONCENTRATIONS OF GAMMA EMITTERS IN AIR PARTICULATE SAMPLES COLLECTED IN THE VICINITY OF BYRON NUCLEAR GENERATING STATION, 2008 RESULTS IN UNITS OF E-3 PCI/CU METER +/- 2 SIGMA Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 STC COLLECTION PERIOD BY-21 01/02/08 -04/01 04/01/08 -07/01 07101/08 -09/30 09/30/08 -12/30 Cs-134 Cs-137 Ba-140 La-140/08/08/08/08 MEAN<4<3<3<4<4<2<4<3<7<5< 10<6<5<7< 16<5 BY-22 01102/08 04/01/08 07/01/08 09/30/08 MEAN BY-23 01/02/08 04/01/08 07/01/08 09/30/08 MEAN BY-24 01/02/08 04/01/08 07/01/08 09/30/08 MEAN 04/01/08 07/01/08 09/30/08 12/30/08< 16< 19< 55< 22<11< 22* 68< 13< 18< 22< 48< 11< 22< 22< 60< 19 3 2 3 4 2 3 4 3 8 8 10 7<6<7< 14<7<5<6< 18<5< 14< 11< 25< 10<9<12< 26<8<4<3<3<4<3<4<4<2 8 8 8 8<3<3<2<3<3<3<4<2<2<4<3<2<3<2<3<3* 931< 1020< 36300< 533< 678< 1090< 49300< 347* 723< 1100< 36300* 528< 855< 845< 39100< 452* 420* 384< 18700< 173< 237< 290< 25700* 133* 261* 486< 13800< 137< 326< 310< 17500< 150 04/01/08 07/01/08 09/30/08 12/30/08 04/01 07/01/08 09/30/08 12/30/08< 3< 4<4<3< 5< 7< 10<7<7<5< 10<5< 3< 4<4<3<3< 3<3<4< 7< 11<9<9<9< 8<9<5< 5< 8<11<6<6<7< 14<5< 7< 13< 23<9~<11< 10* 29< 10< 2< 4<3<4<3<3<4<3<4<3<4<30 TABLE C-VI.1 CONCENTRATIONS OF 1-131 IN AIR IODINE SAMPLES COLLECTED IN THE VICINITY OF BYRON NUCLEAR GENERATING STATION, 2008 RESULTS IN UNITS OF E-3 PCI/CU METER +/-2 SIGMA GROUPI I GROUPI 11 GROUP III COLLECTION PERIOD BY-21 BY-22 BY-23 BY-24 BY-01 BY-04 BY-06 BY-08 01/02/08 -01/08/08

< 46 < 46 < 46 < 46 < 42 < 41 < 41 < 40 01/08/08 -01/15/08

< 29 < 29 < 29 < 29 < 33 < 33 < 32 < 33 01/15/08 -01/22/08

< 32 < 43 < 43 < 43 < 20 < 33 < 33 < 32 01/22/08 -01/29/08

< 44 < 44 < 44 < 45 < 35 < 35 < 35 < 35 01/29/08 -02/05/08

< 42 < 54 < 54 < 54 < 41 < 26 < 43 < 44 02/05/08 -02/12/08

< 62 < 62 < 63 < 63 < 62 < 63 < 62 < 61 02/12/08 -02/19/08

< 62 < 62 < 62 < 62 < 65 < 65 < 65 < 64 02/19/08 -02/25/08

< 52 < 47 < 46 < 46 < 62 < 62 < 62 < 31 02/25/08 -03/04/08

< 58 < 58 < 58 < 58 < 35 < 41 < 42 < 35 03/04/08 -03/10/08

< 42 < 42 < 41 < 41 < 35 < 37 < 37 < 34 03/10/08 -03/18/08

< 42 < 56 < 56 < 56 < 68 < 55 < 55 < 67 03/18/08 -03/24/08

< 47 < 28 < 46 < 46 < 48 < 55 < 54 < 49 03/24/08 -04/01/08

< 43 < 43 < 43 < 44 < 33 < 32 < 33 < 33 04/01/08 -04/08/08

< 46 < 46 < 37 < 46 < 56 < 57 < 56 < 56 04/08/08 -04/16/08

< 58 < 58 < 58 < 58 < 67 < 67 < 67 < 67 04/16/08 -04/22/08

< 63 < 63 < 63 < 27 < 69 < 69 < 69 < 68 04/22/08 -04/29/08

< 49 < 49 < 49 < 49 < 48 < 47 < 47 < 47 04/29/08 -05/06/08

< 41 < 63 < 62 < 62 < 25 < 41 < 41 < 42 05/06/08 -05/13/08

< 18 < 18 < 18 < 18 < 14 < 14 < 14 < 14 05/13/08 -05/20/08

< 49 < 49 < 49 < 50 < 37 < 36 < 36 < 37 05/20/08 -05/27/08

< 34 < 34 < 34 < 34 < 30 < 31 < 30 < 29 05/27/08 -06/03/08

< 53 < 53 < 53 < 55 < 44 < 44 < 44 < 46 06/03/08 -06/10/08

< 17 < 17 < 17 < 17 < 18 < 18 < 18 < 17 06/10/08 -06/17/08

< 53 < 52 < 52 < 53 < 53 < 53 < 53 < 55 06/17/08 -06/24/08

< 52 < 54 < <54 < 54 < 58 < 58 < 58 < 58 06/24/08 -07/01/08

< 62 < 62 < 62 < 69 < 65 < 64 < 64 < 66 07/01/08 -07/08/08

< 54 < 54 < 54 < 55 < 44 < 45 < 44 < 42 07/08/08 -07/15/08

< 58 < 58 < 58 < 58 < 53 < 52 < 53 < 55 07/15/08 -07/22/08

< 24 < 24 < 24 < 24 < 22 < 22 < 22 < 21 07/22/08 -07/28/08.

< 55 < 55 < 55 < 55 < 38 < 36 < 37 < 38 07/28/08 -08/05/08

< 34 < 36 < 36 < 36 < 57 < 60 < 58 < 55 08/05/08 -08/12/08

< 60 < 62 < 62 < 62 < 46 < 68 < 45 < 47 08/12/08 -08/19/08

< 52 < 52 < 52 < 52 < 70 < 69 < 69. <69 08/19/08 -08/26/08

< 63 < 63 < 63 < 63 < 67 < 67 < 67 < 68 08/26/08 -09/02/08

< 69 < 69 < 69 < 69 < 65 < 67 < 67 < 64 09/02/08 -09/09/08

< 55 < 55 < 54 < 55 < 26 < 27 < 27 < 28 09/09/08 -09/16/08

< 65 < 65 < 66 < 66 < 46 < 45 < 45 < 44 09/16/08 -09/23/08

< 68 < 68 < 67 < 67 < 51 < 51 < 51 < 52 09/23/08 -09/30/08

< 70 < 68 < 69 < 70 < 61 < 61 < 60 < 59 09/30/08 -10/07/08

< 65 < 66 < 66 < 66 < 48 < 48 < 48 < 50 10/07/08 -10/14/08

< 48 < 48 < 48 < 48 < 51 < 52 < 52 < 49 10/14/08-10/20/08

< 38 < 38 < 39 < 39 < 62 < 60 < 60 < 64 10/20/08 -10/28/08

< 30 < 30 < 30 < 30 < 42 < 44 < 44 < 41 10/28/08 -11/04/08

< 62 < 62 < 62 < 62 < 66 < 66 < 66 < 70 11/04/08 -11/11/08

< 45 < 45 < 45 < 45 < 50 < 49 < 49 < 48 11/11/08 -11/18/08

< 61 < 61 < 61 < 61 < 56 < 58 < 57 < 56 11/18/08 -11/25/08

< 64 < 63 < 64 < 64 < 62 < 60 < 60 < 60 11/25/08 -12/02/08

< 57 < 57 < 57 < 57 < 60 < 60 < 60 < 62 12/02/08-12/09/08 < 59 < 59 < 59 < 59 < 65 < 67 < 67 < 65 12/09/08 -12/16/08

< 57 < 57 < 57 < 57 < 52 < 53 < 52 < 52 12/16/08-12/22/08 < 62 < 62 < 62 < 63 < 65 < 65 < 65 < 65 12/22/08 -12/30/08 < 54. <54 < 54 < 54 < 48 < 50 < 49 < 49 MEAN --------C-12 C-12 64 of 206 TABLE C-VII.1 CONCENTRATIONS OF 1-131 IN MILK SAMPLES COLLECTED IN THE VICINITY OF BYRON NUCLEAR GENERATING STATION, 2008 RESULTS IN UNITS OF PCI/LITER

+/- 2 SIGMA CONTROL FARMI COLLECTION BY-26-1 INDICATOR FARM BY-30-1 BY-20-1 BY-30 BY-38 PERIOD 01/08/08 02/05/08 03/04/08 04/01/08 05/06/08 05/20/08 06/03/08 06/17/08 07/01/08 07115/08 07/28/08 08/12/08 08/26/08 09/09/08 09/23/08 10/07/08 10/20/08 11/04/08 12/02/08< 0.4< 0.9< 0.7< 0.7< 0.3< 0.6< 0.5< 0.7< 0.6< 0.5< 0.6< 0.7< 0.9< 0.7< 0.7< 0.8< 0.8< 0.8< 0.7< 0.7< 0.8< 0.7< 0.7< 0.4< 0.9< 0.6< 0.8< 0.7< 0.6< 0.5< 0.9< 0.9< 0.8< 0.7< 0.9< 0.9< 0.7< 0.4< 0.7 (1)(1)< 0.8 (1)< 0.7< 1.0< 0.6< 0.8< 0.8< 0.6< 0.6< 0.8< 0.9< 0.9< 0.8< 0.8< 0.9< 0.7< 0.6 MEAN (1) SEE PROGRAM CHANGES SECTION FOR EXPLANATION C-13 65 of 206 TABLE C-VII.2 CONCENTRATIONS OF GAMMA EMITTERS IN MILK SAMPLES COLLECTED IN THE VICINITY OF BYRON NUCLEAR GENERATING STATION, 2008 RESULTS IN UNITS OF PCI/LITER

+/- 2 SIGMA STC COLLECTION PERIOD BY-20-1 01/08/08 02/05/08 03/04/08 04/01/08 05/06/08 05/20/08 06/03/08 06/17/08 07/01/08 07/15/08 07/28/08 08/12/08 08/26/08 09/09/08 09/23/08 10/07/08 10/20/08 11/04/08 12/02/08 Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 Cs-134 Cs-137 Ba-140 La-140<6<7<6<6<4<6<8<5<6<6<7<5<6<6<6<3<2<1<6<6<6<6<5.< 5<7<6<6<6<5<8<6<5<7<6<3<2<1<6< 14< 14< 16< 12< 10<17* 22< 13< 16< 15< 17<15< 16< 14<15<9<6<4<14<7<8<8<5<4<8<9<5<7<8<6<6<7<5<5<3<2<1<6< 15< 17< 15< 10<10<15<17<13< 14< 15< 18< 13< 12< 12<12<7<5<2<15<6<6<6<5<5<7<8<6<6<7<7<6<7<7<7<4<2<1<6<9< 12< 10< 10<8<15< 14< 10< 12< 12< 15< 12< 12< 10< 11<6<5<2< 11<5<5<5<5<4<6<6<5<5<5<6<5<6<5<5<3<2<1<5* 26* 32* 28< 24< 23< 43< 44< 40* 41< 41< 48< 39< 46< 43< 42< 49< 39< 43< 33<8< 11<8<4<8<13< 14< 15< 12< 12< 15< 14< 10<11<11< 14< 11<13<9 MEAN ON ON C ON TABLE C-VII.2 CONCENTRATIONS OF GAMMA EMITTERS IN MILK SAMPLES COLLECTED IN THE VICINITY OF BYRON NUCLEAR GENERATING STATION, 2008 RESULTS IN UNITS OF PCI/LITER

+/- 2 SIGMA STC COLLECTION PERIOD Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 Cs-134 Cs-137 Ba-140 La-140 h)BY-26-1 01/08/08 02/05/08 03/04/08 04/01/08 05/06/08 05/20/08 06/03/08 06/17/08 07/01/08 07/15/08 07/28/08 08/12/08 08/26/08 09/09/08 09/23/08 10/07/08 10/20/08 11/04/08 12/02/08 MEAN BY-30 01/08/08 (1)MEAN<7<5<5<5<8<5<8<5<5<5<7<5<7<6<7<1<2<1<4<6<7<4<5<7<7<7<5<6<5<7<5<7<6<7<2<3<1<5< 14< 17<11< 12< 19< 13< 15< 14< 12< 14< 18< 14< 19< 17< 15<4<8<5< 12<6<6<6<8<7<5<6<6<5<5<8<6<6<6<6<1<3<1<5< 14< 15< 12< 11< 16< 12< 16< 10< 11< 11< 14< 10< 17< 13< 15<3<5<3< 11<6<6<5<5<7<6<7<6<6<6<7<6<7<7<7<2<3<2<5< 12<9<9<8< 12< 10< 12< 10< 10< 10< 13< 11< 13< 12< 13<3<5<3<8<5<6<5<5<6<5<7<5<4<5<6<4<6<5<6<1<2<1<4< 21< 27< 21< 26< 44< 42< 32< 37< 31< 36< 40< 35< 44< 45< 47< 24< 47< 48< 29<7< 10<5<9< 12< 13< 11<9<8<9< 15< 11< 15< 14< 11<7< 12< 14< 10<6<6< 16<9 <16<6 <11<6 < 6<27 <6 ON, ON (1) SEE PROGRAM CHANGES SECTION FOR EXPLANATION TABLE C-VII.2 CONCENTRATIONS OF GAMMA EMITTERS IN MILK SAMPLES COLLECTED IN THE VICINITY OF BYRON NUCLEAR GENERATING STATION, 2008 RESULTS IN UNITS OF PCI/LITER

+/- 2 SIGMA STC COLLECTION PERIOD Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 Cs-134 Cs-137 Ba-140 La-140 BY-30-1 04/01/08 (1) 05/06/08 05/20/08 06/03/08 06/17/08 07/01/08 07/15/08 07/28/08 08/12/08 08/26/08 09/09/08 09/23/08 10/07/08 10/20/08 11/04/08 12/02/08<6<6<6<5<6<6<6<5<8'<7<6<5<1<2<1<4<7<6<7<5<6<7<7<6<7<8<6<6<2<3<1<5< 16< 14< 14<12<12<16< 15<15<17< 21<16<18<5<6<4< 11<7<6<5<6<6<7<5<6<8<6<7<6<2<2<1<4*17<12<15< 12< 15< 15< 15< 11< 17< 16< 12< 15<4<5<2< 10<7<6<7<6<7<6<7<5<7<7<6<6<2<3<1<5< 11<9< 13<9< 12< 10<12< 11< 14< 13< 11< 12<3<5<2<9<6<5<6<5<6<4<5<5<7<6<5<5<1<2<1<4 6 5 7 5 7 5 6 5 8 7 5 6 2 2 1 5< 35< 34< 47* 30* 48< 40* 46< 38< 49< 58< 44< 44< 28* 40< 46* 26<12<9< 15< 10< 12< 13< 13< 12< 14< 14< 14< 14<8< 10< 13<8 MEAN O0 00 (1) SEE PROGRAM CHANGES SECTION FOR EXPLANATION TABLE C-VIII.1 CONCENTRATIONS OF GAMMA EMITTERS IN VEGETATION SAMPLES COLLECTED IN THE VICINITY OF BYRON NUCLEAR GENERATING STATION, 2008 RESULTS IN UNITS OF PCI/KG WET +/- 2 SIGMA STC COLLECTION PERIOD Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 1-131 Cs-134 Cs-137 Ba-140 La-140 C)b BY-CONTROL Cabbage Corn BY-QUAD 1 Cabbage Potatoes BY-QUAD 2 Onions Swiss Chard BY-QUAD 3 Corn leaves Corn leaves 08/27/08 08/27/08<3 <3 <8 <3 <6 <3 <6 <24 <2 <3 <38<4 <5 <13 <4 <12 <6 .<11 <47 <5 <5 <71 MEAN 08/27/08 08/27/08<2 <3 <8 <3 <6 <3 <5 <24 <2 <3 <38 <11<4 <4 <11 <4 <9 <5 <8 <33 <3 <4 <46 <12<9< 18 MEAN 08/27/08 < 6 < 6 < 14 < 5 < 12 < 7 < 11 < 54 < 5 < 6 < 81 < 24 08/27/08 < 10 < 12 < 30 < 9 < 21 < 13 < 23 < 48 < 9 < 10 < 142 < 43 MEAN ------------09/09/08(1)

< 10 < 12 <22 < 10 <24 < 15 < 19 < 57 < 11 < 11 < 104 < 34 09/09/08 < 10 < 12 < 25 < 11 < 23 < 11 < 20 < 55 < 10 < 12 < 98 < 30 MEAN BY-QUAD 4 Lettuce & Beet top ci 08/27/08 Rutabagas 08/27/08< 13 < 13 < 33 < 13 < 28 < 15 < 23 < 45 < 11 < 13 < 171 < 43<5 < 7 < 15 < 5 < 12 < 7 < 12 < 58 < 5 < 5 < 75 < 22 ON MEAN (1) SEE PROGRAM EXCEPTIONS SECTION FOR EXPLANATION TABLE C-IX.1 QUARTERLY TLD RESULTS FOR BYRON NUCLEAR GENERATING STATION, 2001 RESULTS IN UNITS OF MILLI-ROENTGEN/QUARTER

+/- 2 STANDARD DEVIATIONS STATION CODE MEAN+/- 2 S.D.JAN -MAR APR -JUN JUL -SEP OCT- DEC IY-uI-1 BY-0 1-2 BY-04-1 BY-04-2 BY-06-1 BY-06-2 BY-08-1 BY-08-2 BY-21-1 BY-21-2 BY-22-1 BY-22-2 BY-23-1 BY-23-2 BY-24-1 BY-24-2 BY-101-1 BY-101-2 BY-1 02-1 BY-102-2 BY-103-1 BY-1 03-2 BY-1 03-3 BY-104-1 BY- 104-2 BY- 104-3 BY-105-1 BY-105-2 BY-106-1 BY-106-2 BY-1 07-1 BY-1 07-2 BY-1 07-3 BY-1 08-1 BY-1 08-2 BY-109-1 BY- 109-2 BY-110-1 BY-110-2 BY-1 11-3 BY-1 11-4 BY-1 12-3 BY-1 12-4 BY-113-1 BY-1 13-2 BY-1 14-1 BY-1 14-2 19.8 3.8 19.5 + 5.3 22.8 + 4.4 22.5 + 4.2 19.0 + 4.3 19.3 +/- 4.7 19.5 _ 3.5 19.3 _ 3.4 19.8 +/- 3.8 19.8 + 3.8 24.8 + 4.4 24.8 + 6.2 23.3 +/- 5.7 23.3 + 4.4 22.0 +/- 4.9 23.0 +/- 6.7 19.8 + 5.3 19.0 + 4.3 23.8 + 2.5 23.5 +/- 3.5 23.3 + 4.4 23.8 +/- 1.9 22.0 +/- 7.2 24.5 +/- 3.5 24.8 +/- 1.9 23.0 +/- 8.7 26.7 + 5.0 25.0 +/- 4.3 24.0 +/- 4.0 23.3 +/- 5.0 25.5 + 5.8 26.0 + 5.9 22.0 + 2.0 24.5 +/- 4.8 23.0 + 4.3 22.8 + 5.3 23.0 +/- 4.3 21.5 + 4.8 22.5 +/- 4.8 24.0 + 2.8 23.3 +/- 4.4 22.8 +/- 3.8 23.5 +/- 1.2 22.8 +/- 4.1 21.0 +/- 5.4 21.3 +/- 7.5 23.0 +/- 4.3 21 22 22 22 20 19 20 20 20 20 24 23 24 24 22 27 21 21 24 24 25 23 (1)25 24 (1)24 25 25 23 25 29 (1)25 25 23 23 23 23 24 24 23 24 23 22 20 23 21 19 25 23 19 21 20 19 21 21 26 25 25 24 22 22 20 20 24 24 24 24 23 25 25 25 27 27 25 24 29 27 23 26 24 24 24 22 24 25 25 24 23 23 23 22 25 20 21 24 25 21 21 21 21 21 21 27 29 25 25 25 24 22 19 25 25 24 25 25 26 26 26 29 26 25 26 26 26 22 26 23 25 25 23 24 25 24 24 24 25 22 26 24 (1) SEE PROGRAM CHANGES SECTION FOR EXPLANATION (2) SEE PROGRAM EXCEPTIONS SECTION FOR EXPLANATION C-18 70 of 206 TABLE C-IX.1 QUARTERLY TLD RESULTS FOR BYRON NUCLEAR GENERATING STATION, 2001 RESULTS IN UNITS OF MILLI-ROENTGEN/QUARTER

+/- 2 STANDARD DEVIATIONS STATION CODE MEAN+/-2 S.D.JAN -MAR APR -JUN JUL -SEP OCT -DEC BY-115-1 BY-1 15-2 BY-1 16-1 BY-116-2 BY-116-3 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-21 1-1 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 BY-301-1 BY-302-1 BY-314-1 24.0 +/- 5.7 20.5 +/- 4.8 20.5 +/- 3.5 21.5 +/- 6.0 21.3 +/- 7.6 22.3 +/- 4.4 23.0 +/- 5.4 20.8 +/- 5.3 23.8 +/- 5.3 19.0 +/- 4.0 22.0 +/- 3.7 22.0 +/- 7.5 24.8 +/- 1.9 24.5 +/- 4.2 21.8 +/- 5.3 24.0 +/- 4.3 24.0 +/- 5.4 25.8 +/- 6.4 23.3 +/- 3.4 25.0 +/- 2.8 25.3 +/- 1.9 24.0 +/- 2.8 24.0 +/- 4.3 23.0 +/- 4.9 22.5 +/- 6.8 23.3 +/- 3.4 22.3 +/- 6.6 24.8 +/- 3.0 24.3 +/- 4.7 23.8 +/- 5.0 26.0 +/- 9.1 23.5 +/- 5.3 23.5 +/- 5.0 24.8 +/- 6.4 25.5 +/- 6.2 25.3 +/- 4.7 23.0 +/- 5.2 19.3 +/- 4.4 23.3 +/- 6.2 20.3 + 4.4 22 19 21 20 (1)23 24 21 26 20 21 21 24 24 22 24 26 28 24 25 26 23 24 22 22 23 26 24 26 25 29 26 26 27 27 27 22 20 26 21 22 18 18 18 17 19 19 17 20 16 20 18 24 22 18 21 20 21 21 23 24 23 21 20 18 21 19 23 (2)20 20 20 20 20 21 22 20 16 19 17 (1) SEE PROGRAM CHANGES SECTION FOR EXPLANATION (2) SEE PROGRAM EXCEPTION SECTION FOR EXPLANATIjI4 71 of 206 TABLE C-IX.2 MEAN QUARTLY TLD RESULTS FOR THE INNER RING, OUTER RING, SPECIAL INTEREST, OTHER AND CONTROL LOCATIONS FOR BYRON NUCLEAR GENERATING STATION, 2008 RESULTS IN UNITS OF MILLI-ROENTGENS/QUARTER

+/- 2 STANDARD DEVIATIONS OF THE STATION DATA COLLECTION PERIOD JAN-MAR APR-JUN JUL-SEP OCT-DEC INNER RING+/- 2 S.D.OUTER RING SPECIAL INTEREST OTHER CONTROL 23.3 +/- 3.9 19.9 +/- 4.2 24.1 +/- 4.0 24.4 +/- 3.5 24.3 +/- 4.5 20.4 +/- 3.8 24.8 +/- 3.9 24.8 +/- 3.2 22.3 +/- 6.4 17.3 +/- 3.1 22.0 +/- 5.3 22.0 +/- 2.0 22.1 +/- 4.3 18.6 +/- 4.2 22.4 +/- 4.6 23.5 +/- 5.4 20.0 +/- 0.0 17.0 +/- 0.0 19.5 +/- 1.4 21.0 +/- 0.0 TABLE C-IX.3

SUMMARY

OF THE AMBIENT DOSIMETRY PROGRAM FOR BYRON NUCLEAR GENERATING STATION, 2008 RESULTS IN UNITS OF MILLI-ROENTGEN/QUARTER LOCATION INNER RING OUTER RING SPECIAL INTEREST OTHER CONTROL SAMPLES PERIOD PERIOD PERIOD MEAN ANALYZED MINIMUM MAXIMUM +/- 2 S.D.139 16 29 22.9 +/- 5.3 127 16 30 23.6 +/- 5.3 12 16 26 20.9 +/- 5.8 56 16 29 21.7 +/- 5.9 8 17 21 19.4 +/- 3.2 INNER RING STATIONS -BY-101-1, BY-101-2, BY-102-1, BY-102-2, BY-103-1, BY-103-2, BY-103-3, BY-104-1, BY-104-2, BY-104-3, BY-105-1, BY-105-2, BY-106-1, BY-106-2, BY-107-1, BY-107-2, BY-107-3, BY-108-1, BY-108-2, BY-109-1, BY-109-2, BY-110-1, BY-110-2, BY-111-3, BY-111-4, BY-112-3, BY-112-4, BY-113-1, BY-113-2, BY-114-1, BY-114-2, BY-115-1, BY-115-2, BY-116-1, BY-116-2, BY-116-3 OUTER RING STATIONS -BY-201-3, BY-201-4, BY-202-1, BY-202-2, BY-203-1, BY-203-2, BY-204-1, BY-204-2, BY-205-1, BY-205-2, BY-206-1, BY-206-2, BY-207-1, BY-207-2, BY-208-1, BY-208-2, BY-209-1, BY-209-4, BY-210-3, BY-210-4, BY-211-1, BY-211-4, BY-212-1, BY-212-4, BY-213-1, BY-213-4, BY-214-1, BY-214-4, BY-215-1, BY-215-4, BY-216-1, BY-216-2 SPECIAL INTEREST STATIONS -BY-301-1, BY-302-1, 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 C-20 72 of 206 FIGURE C-1 Surface Water -Gross Beta -Station BY-12 and BY-29 (C)Collected in the Vicinity of BNGS, 2000 -2004 BY-12 Oregon Pool of Rock River, Downstream 8.0 4-0.f~A1yq 2.0 01-00 14.0 -12:.0 -BY-29 (C) Byron, Upstream F'-J 80--4.0 -0.0 01-01 -ro.42-31-OC 12-31-01 12-31-02 12-3---Mý 12r1jO.04 73 of 206 FIGURE C-1 (cont.)Surface Water -Gross Beta -Station BY-12 and BY-29 (C)Collected in the Vicinity of BNGS, 2005 -2008 BY-12 Oregon Pool of Rock River, Downstream 8.0 "-C-a.01-10-05 08-01-05 02-20-06 09-11-06 04-02-07 10-22-07 05-12-08 12-01-08 BY-29 (C) Byron, Upstream 8.0,-6.0o--J C-)a.4.04 2.0-0.0 I I I I I I I 01-10-05 08-01-05 02-20-06 09-11-06 04-02-07 10-22-07 05-12-08 12-01-08 DUE TO VENDOR CHANGE IN 2005, < VALUES ARE LLD VALUES JANUARY THROUGH JUNE 2005 AND MDC VALUES AFTER JUNE 2005 74 of 206 FIGURE C-2 Surface Water -Tritium -Stations BY-12 and BY-29 (C)Collected in the Vicinity of BNGS, 2000 -2004 BY-12 Oregon Pool of Rock River, Downstream-J 39O0 3500 31 Lo0 2700 2300 1900 1500 1100 700 /-300 -A \ -`ý'N 12-31-00 12-31-01 1C2-31-02 12-31-03 1 2-30m-4 BY-29(C) Byron, Upstream 500.400 -I 300" +-200 100 -4~N7N ul-100 011-01-0[1 12-31-00 12-34-01 12-31-02 12-3T-03 12-3'0-04 75 of 206 FIGURE C-2 (cont.)Surface Water -Tritium -Stations BY-12 and BY-29 (C)Collected in the Vicinity of BNGS, 2005 -2008 BY-12 Oregon Pool of Rock River, Downstream 3500 3000 2500 2000 L5 a. 1500 1000 500 0 03-31-05 10-12-05 04-25-06 11-06-06 05-20-07 12-01-07 06-13-08 12-25-08 BY-29 (C) Byron, Upstream 250 200 150--C.100 50 03-31-05 10-12-05 04-25-06 11-06-06 05-20-07 12-01-07 06-13-08 12-25-08 DUE TO VENDOR CHANGE IN 2005, < VALUES ARE LLD VALUES JANUARY THROUGH JUNE 2005 AND MDC VALUES AFTER JUNE 2005 76 of 206 FIGURE C-3 Ground Water -Tritium -Stations BY-14-1 and BY-18 Collected in the Vicinity of BNGS, 2000 -2004 BY-14-1 3200 N. German Church Road U U.400 0.-\ /K7 I\\ I/ /./\" m200~ -Ii 12-31-02 12-310-3 12-3D-04 BY-18 McCoy Farmstead Well dOO 400.3W0D 2W00 01-1-001'IN ý, / \ / / -I--\/\,/\/\,,,-) I 12-31-00 12-31 .01 12,31-02 12-31-93 1 2- 77 of 206 FIGURE C-3 (cont.)Ground Water -Tritium -Stations BY-14-1 and BY-18 Collected in the Vicinity of BNGS, 2005 -2008 BY-14-1 3200 N. German Church Road 250-200 150--J C., 100-50-0 03/31/05 09/09/05 02/18/06 07/30/06 01/08/07 06/19/07 11/28/07 05/08/08 10/17/08 BY-18 McCoy Farmstead Well 250 200 150 100 50 03/31/05 09/09/05 02/18/06 07/30/06 01/08/07 06/19/07 11/28/07 05/08/08 10/17/08 DUE TO VENDOR CHANGE IN 2005, < VALUES ARE LLD VALUES JANUARY THROUGH JUNE 2005 AND MDC VALUES AFTER JUNE 2005 78 of 206 FIGURE C-4 Ground Water -Tritium -Station BY-32 Collected in the Vicinity of BNGS, 2000 -2004 BY-32 Wofford Well 500 -T 4OO -30+ 4-100-\/\-1-11, \ \K//\-1Lb 12-1-0'0 12-31-01 12-Mt-02 12-31-0,3 12-3"04 79 of 206 FIGURE C-4 (cont.)Ground Water -Tritium -Station BY-32 Collected in the Vicinity of BNGS, 2005 -2008 BY-32 Wolford Well 250 -200, 150 C.,.0.100 03/31/05 09/09/05 02/18/06 07/30/06 01/08/07 06/19/07 11/28/07 05/08/08 10/17/08 DUE TO VENDOR CHANGE IN 2005, < VALUES ARE LLD VALUES JANUARY THROUGH JUNE 2005 AND MDC VALUES AFTER JUNE 2005 80 of 206 FIGURE C-5 Ground Water -Tritium -Stations BY-35 and BY-36 Collected in the Vicinity of BNGS, 2006-2008 BY-35 250 200 4 150--J C.)100 I II l l l l I v U 04/11/06 10/12/06 04/14/07 10/15/07 04/16/08 10/17/08 BY-36 250 -2004.... .... .. .............

1111o ............

...............

...150 ,-c3 0.100 -I 50+0+I I I I I 04/11/06 10/12/06 04/14/07 10/15/07 04/16/08 10/17/08 NEW STATIONS IN 2006 81 of 206 FIGURE C-6 Ground Water -Tritium -Stations BY-37 Collected in the Vicinity of BNGS, 2006-2008 BY-37 250-200 150+-J C-)100+50 04/11/06 10/12/06 04/14/07 10/15/07 04/16/08 10/17/08 NEW STATION IN 2006 82 of 206 FIGURE C-7 Air Particulates

-Gross Beta -Stations BY-08 (C) and BY-21 Collected in the Vicinity of BNGS, 2000 -2004 BY-08 (C) Leaf River 4.10 6 4 2 01~01-01-,.80 12-31-00 12-31-41 1241-02 12-11-OS BY-21 Byron Nearsite N 0 4'D 4.--01-0 1400 i2.3v.00 12-ý31 .1 12-31032 12-31,03 -12A30-04 83 of 206 FIGURE C-7 (cont.)Air Particulates

-Gross Beta -Stations BY-08 (C) and BY-21 Collected in the Vicinity of BNGS, 2005 -2008 BY-08 (C) Leaf River 60.0 50.0 40.0 30.0 03 9 o 20.0 10.0 L 010.04-0 1-04-05 10-22-05 08-09-06 05-27-07 03-13-08 12-29-08 BY-21 Byron Nearsite N C,.03 9 LU 0 60.0 50.0 40.0 30.0 20.0 10.0 0.0 04-05 10-22-05 08-09-06 05-27-07 03-13-08 12-29-08 DUE TO VENDOR CHANGE IN 2005, THE REPORTED UNITS CHANGED FROM E-02 PCI/M3 TO E-03 PCI/M3 84 of 206 FIGURE C-8 Air Particulates

-Gross Beta -Stations BY-22 and BY-23 Collected in the Vicinity of BNGS, 2000 -2004 BY-22 Byron Nearsite ESE 10 1 U 4 2 o 4-01,01-00 12,31-01 12-31-02 12-31433 -,2-&)44 BY-23 Byron Nearsite S t0.0 a q 0,0 4-0I-DI-00 12431-DD U-1,0~F1 1241142 12-31402 85 of 206 FIGURE C-8 (cont.)Air Particulates

-Gross Beta -Stations BY-22 and BY-23 Collected in the Vicinity of BNGS, 2005 -2008 BY-22 Byron Nearsite ESE 60.0-50.0-E40.0-LU 3- 0.0- -tb 0 AIli 01-04-05 10-22-05 08-09-06 05-27-07 03-13-08 12-29-08 BY-23 Byron Nearsite S 60.0 50.0 m 0.LU 0 w-40.0 30.0 20.0 10.0 0.0oI-01-04-05 10-22-05 08-09-06 05-27-07 03-13-08 12-29-08 DUE TO VENDOR CHANGE IN 2005, THE REPORTED UNITS CHANGED FROM E-02 PCI/M3 TO E-03 PCI/M3 86 of 206 FIGURE C-9 Air Particulates

-Gross Beta -Station BY-24 Collected in the Vicinity of BNGS, 2000 -2004 BY-24 Byron Nearsite SW 104. 0 2.0.87 of 206 FIGURE C-9 (cont.)Air Particulates

-Gross Beta -Station BY-24 Collected in the Vicinity of BNGS, 2005 -2008 BY-24 Byron Nearsite SW E C5,CL.m w 0D 60.0 50.0 40.0 30.0 20.0 10.0 0.0 01-04-05 10-22-05 08-09-06 05-27-07 03-13-08 12-29-08 DUE TO VENDOR CHANGE IN 2005, THE REPORTED UNITS CHANGED FROM E-02 PCI/M3 TO E-03 PCI/M3 88 of 206 FIGURE C-10 Air Particulates

-Gross Beta -Stations BY-01 and BY-04 Collected in the Vicinity of BNGS, 2005 -2008 BY-01 60.0 50.0 40.0 30.0 C, LU 20.0 10.0 0.0 4-07-05-05 03-17-06 11-27-06 08-09-07 04-20-08 12-31-08 BY-04 60.0 50.0 40.0" 30.0 , 20.0 10.0 0.0 1 07-05-05 03-17-06 11-27-06 08-09-07 04-20-08 12-31-08 AIR PARTICULATE GROSS BETA ANALYSES OF FAR FIELD LOCATIONS STARTED IN JULY 2005 89 of 206 FIGURE C-11 Air Particulates

-Gross Beta -Station BY-06 Collected in the Vicinity of BNGS, 2005 -2008 BY-06 60.0 50.0 40.0 0 5 20.0 10.0 0.0 I 07-05-05 03-17-06 11-27-06 08-09-07 04-20-08 12-31-08 AIR PARTICULATE GROSS BETA ANALYSES OF FAR FIELD LOCATIONS STARTED IN JULY 2005 90 of 206 APPENDIX D INTER-LABORATORY COMPARISON PROGRAM 91 of 206

/92 of 206 TABLE D-1 ANALYTICS ENVIRONMENTAL RADIOACTIVITY CROSS CHECK PROGRAM TELEDYNE BROWN ENGINEERING, 2008 (PAGE 1 OF 3)Identification Reported Known Ratio (c)Month/Year Number Matrix Nuclide Units Value (a) Value (b) TBE/Analytics Evaluation (d)March 2008 E5847-396 E5848-396 Milk Milk Sr-89 Sr-90 1-131 Ce-141 Cr-51 Cs-134 Cs-137 Co-58 Mn-54 Fe-59 Zn-65 Co-60 Ce-141 Cr-51 Cs-134 Cs-1 37 Co-58 Mn-54 Fe-59 Zn-65 Co-60 pCi/L 83.5 95.8 pCi/L 13.9 12.9 pCi/L pCi/L pCi/L pCi/L pCi/L pCi/L pCi/L pCi/L pCi/L pCi/L pCi pCi pCi pCi pCi pCi pCi pCi pCi 57.3 229 336 106 141 71.8 98.1 102 135 230 163 233 72.6 98.3 46.7 69.8 72.2 106 156 60.0 249 359 125 146 70.8 94.2 102 137 236 157 227 79.0 92.0 44.7 59.4 64.5 86.4 149 E5850A-396 AP June 2008 E5849-396 E5971-396 E5972-396 E5974-396 Charcoal 1-131 pCi 65.5 60.1 pCi/L 83.9 85.0 pCi/L 14.4 15.8 0.87 1.08 0.96 0.92 0.94 0.85 0.97 1.01 1.04 1.00 0.99 0.97 1.04 1.03 0.92 1.07 1.04 1.18 1.12 1.23 1.05 1.09 0.99 0.91 0.99 0.90 1.15 0.91 0.99 0.95 1.03 1.07 1.02 0.97 1.00 1.05 1.05 1.03 0.98 1.13 0.99 1.06 1.04 A A A A A A A A A A A A A A A A A A A w A A A A A A A A A A A A A A A A A A A A A A A Milk Milk Sr-89 Sr-90 1-131 Ce-141 Cr-51 Cs-134 Cs-1 37 Co-58 Mn-54 Fe-59 Zn-65 Co-60 pCi/L pCi/L pCi/L pCi/L pCi/L pCi/L pCi/L pCi/L pCi/L pCi/L pCi pCi pCi pCi pCi pCi pCi pCi pCi 70.9 157 159 69.7 115 59.1 139 98.4 129 101 206 173 95.9 142.0 72.0 180 108.0 159 129 71.4 174 138 76.7 116 61.9 135 91.7 127 104 207 164 91.0 138.0 73.4 160.0 109.0.150 124 AP Ce-141 Cr-51 Cs-134 Cs-137 Co-58 Mn-54 Fe-59 Zn-65 Co-60 93 of 206 TABLE D-1 ANALYTICS ENVIRONMENTAL RADIOACTIVITY CROSS CHECK PROGRAM TELEDYNE BROWN ENGINEERING, 2008 (PAGE 2 OF 3)Identification Reported Known Ratio (c)Month/Year Number Matrix Nuclide Units Value (a) Value (b) TBE/Analytics Evaluation (d)June 2008 E5973-396 Charcoal 1-131 pCi 73.8 84.1 pCi/L 76.2 73.9 pCi/L 12.3 11.0 September 2008 E6284-396 E6285-396 E6287-396 Milk Milk Sr-89 Sr-90 1-131 Ce-141 Cr-51 Cs-134 Cs-1 37 Co-58 Mn-54 Fe-59 Zn-65 Co-60 pCi/L pCi/L pCi/L pCi/L pCi/L pCi/L pCi/L pCi/L pCi/L pCi/L pCi pCi pCi pCi pCi pCi pCi pCi pCi 65.7 145 406 196 147 167 165 161 305 218 79.5 208 106 79.3 87.7 90.3 81.7 144 111 67.9 161 421 232 162 179 166 144 319 234 76.3 199 110 76.7 84.4 78.6 68.3 151 ill AP Ce-141 Cr-51 Cs-134 Cs-137 Co-58 Mn-54 Fe-59 Zn-65 Co-60 0.88 1.03 1.12 0.97 0.90 0.96 0.84 0.91 0.93 0.99 1.12 0.96 0.93 1.04 1.05 0.96 1.03 1.04 1.15 1.20 0.95 1.00 1.04 1.07 1.43 0.87 0.93 0.94 0.87 0.99 1.00 1.01 1.00 0.97 1.00 1.01 1.08 1.01 1.05 1.03 0.97 1.00 0.88 1.07 A E6286-396 Charcoal 1-131 pCi 93.2 90.0 pCi/L 98.4 91.9 pCi/L 18.0 12.6 December 2008 E6415-396 E6416-396 E6418-396 Milk Milk Sr-89 Sr-90 1-131 Ce-141 Cr-51 Cs-134 Cs-137 Co-58 Mn-54 Fe-59 Zn-65 Co-60 pCi/L pCi/L pCi/L pCi/L pCi/L pCi/L pCi/L pCi/L pCi/L pCi/L pCi pCi pCi pCi pCi pCi pCi pCi pCi 69.2 177 231 117 119 104 153 99.6 177 133 148 202 103 95.4 81.4 113 76.5 122 108 79.9 191 246 134 120 104 152 100 183 133 146 187 102 91.2 79.2 116.0 76.4 139 101 A A N (1)A A A A A A A A A A A A A A A A A A A AP Ce-141 Cr-51 Cs-134 Cs-137 Co-58 Mn-54 Fe-59 Zn-65 Co-60 94 of 206 TABLE D-1 ANALYTICS ENVIRONMENTAL RADIOACTIVITY CROSS CHECK PROGRAM TELEDYNE BROWN ENGINEERING, 2008 (PAGE 3 OF 3)Identification Reported Known Ratio (c)Month/Year Number Matrix Nuclide Units Value (a) Value (b) TBE/Analytics Evaluation (d)December 2008 E6417-396 Charcoal 1-131 pCi 65.8 74.1 0.89 A (1)(a)(b)(C)(d)NCR 09-02 initiated to investigate the failure.Teledyne Brown Engineering reported result.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.

Ratio of Teledyne Brown Engineering to Analytics results.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 > 1.30.95 of 206 TABLE D-2 ERA ENVIRONMENTAL RADIOACTIVITY CROSS CHECK PROGRAM TELEDYNE BROWN ENGINEERING, 2008 (PAGE 1 OF 1)Identification Reported Known Month/Year Number Media Nuclide Units Value (a) Value (b) Control Limits Evaluation (c)January 2008 Quiktm Response Water Sr-89 Sr-90 Ba-1 33 Cs-1 34 Cs-1 37 Co-60 Zn-65 Gr-A Gr-B H-3 January 2008 RAD 72 Water Sr-89 Sr-90 Ba-133 Cs-134 Cs-137 Co-60 Zn-65 Gr-A Gr-B 1-131 H-3 Water Sr-89 Sr-90 Ba-133 Cs-134 Cs-137 Co-60 Zn-65 Gr-A Gr-B 1-131 H-3 pCi/L pCi/L pCi/L pCi/L pCi/L pCi/L pCi/L pCi/L pCi/L pCi/L ,pCi/L pCi/L pCi/L pCi/L pCi/L pCi/L pCi/L pCi/L pCi/L pCi/L pCi/L pCi/L pCi/L pCi/L pCi/L pCi/L pCi/L pCi/L pCi/L pCi/L pCi/L pCi/L 37.33 40.40 87.8 80.67 222.33 98.9 352 13.0 32.7 11100 69.0 35.6 25.9 86.5 155 16.0 214 13.3 21.2 22.8 3390 65.47 39.80 59.63 45.00 97.97 75.47 109 41.03 50.20 26.67 11633 19.0 42.7 90.5 88.9 231 101.0 350 12.7 36.2 11300 65.3 41.4 25.7 92.6 158 14.4 204 14.8 22.5 23.6 3540 60.4 39.2 58.3 46.6 102 76.6 106 50.8 51.4 28.7 12000 11.8 -25.2 31.5 -49.0 76.2 -99.6 72.9 -97.8 208 -256 90.9-113 315-408 6.02 -18.7 23.8 -43.8 9840- 12400 53.0 -73.4 30.5 -47.6 20.0 -29.5 76.0- 102 142- 176 11.4-18.7 184 -240 7.15-21.2 13.7- 30.6 19.6-28.0 3000-3910 48.6 -68.2.28.8-45.1 48.3 -64.3 37.4-51.3 91.8-115 68.9 -86.7 95.4 -126 26.5 -63.7 35.0 -58.4 23.9 -33.6 10400 -13200 N (1)A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A April 2008 Rad 73 (1) Could find no cause for Sr-89 failure. Sample sent to outside lab for verification, but the outside laboratory was unable to confirm our numbers or ERA numbers. Studies bracketing these results, RAD 71 and RAD 72, had acceptable Sr-89 results. NCR 08-03 (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.96 of 206 TABLE D-3 DOE'S MIXED ANALYTE PERFORMANCE EVALUATION PROGRAM (MAPEP)TELEDYNE BROWN ENGINEERING, 2008 (PAGE 1 OF 2)Identification Reported Known Acceptance Month/Year Number Media Nuclide Units Value (a) Value (b) Range Evaluation (c)January 2008 07-MaW18 07-GrW18 Water Cs-134 Cs-137 Co-57 Co-60 H-3 Mn-54 Sr-90 Zn-65 Water Gr-A Gr-B 07-MaS18 Soil Cs-134 Cs-137 Co-57 Co-60 Mn-54 K-40 Sr-90 Zn-65 07-RdF18 07-GrF18 January 2008 07-RdV18 AP Cs-134 Cs-137 Co-57 Co-60 Mn-54 Sr-90 Zn-65 AP Gr-A Gr-B Vegetation Cs-1 34 Cs-1 37 Co-57 Co-60 Mn-54 K-40 Sr-90 Zn-65 Water Cs-134 Cs-137 Co-57 Co-60 H-3 Mn-54 Sr-90 Zn-65 Bq/L -0.26 Bq/L 0.029 Bq/L 21 22.8 Bq/L 8.2 8.40 Bq/L 473 472 Bq/L 12 12.1 Bq/L 10.70 11.4 Bq/L 15.6 16.3 Bq/L 1.4 1.399 Bq/L 3.06 2.43 Bq/kg 790 854.0 Bq/kg 568 545 Bq/kg 424 421 Bq/kg 2.307 2.9 Bq/kg 611 570 Bq/kg 6.09 571 Bq/kg 454 493.0 Bq/kg 0.162 Bq/sample 2.73 2.5200 Bq/sample 2.88 2.7 Bq/sample 3.493 3.55 Bq/sample 1.357 1.31 Bq/sample 0.006 Bq/sample 1.61 1.548 Bq/sample 2.59 2.04 Bq/sample 0.131 0.348 Bq/sample 0.261 0.286 Bq/sample 5.25 6.28 Bq/sample 3.13 3.41 Bq/sample 6.837 6.89 Bq/sample 2.44 2.77 Bq/sample 4.45 4.74 Bq/sample 61.3 Bq/sample 1.33 1.273 Bq/sample 0.085 Bq/L 17.1 19.5 Bq/L 21.4 23.6 Bq/L -0.044 Bq/L 10.8 11.6 Bq/L 334 341 Bq/L 13.0 13.7 Bq/L 6.55 6.45 Bq/L 16.5 17.1 (1)(1)16.0-29.6 5.88- 10.92 330-614 8.5- 15.7 7.98- 14.82 11.4-21.2>0.0 -2.798 1.22-3.65 598-1110 382 -709 295 -547 (2)399 -741 400 -742 345 -641 (1)1.76-3.28 1.89 -3.51 2.49 -4.62 0.92-1.70 (1)1.084 -2.012 1.43 -2.65>0.0 -0.696 0.143 -0.429 4.40-8.16 2.39 -4.43 4.82 -8.96 1.94-3.60 3.32-6.16 (1)0.891 -1.655 (1)A A A A A A A A A A A A A A A A A A August 2008 08-MaW19 13.7-25.4 16.5-30.7 (1)8.1 -15.1 239 -443 9.6- 17.8 4.52- 8.39 12.0-22.2 A A A A A A A A 97 of 206 TABLE D-3 DOE'S MIXED ANALYTE PERFORMANCE EVALUATION PROGRAM (MAPEP)TELEDYNE BROWN ENGINEERING, 2008 (PAGE 2 OF 2)Identification Reported Known Acceptance Month/Year Number Media Nuclide Units Value (a) Value (b) Range Evaluation (c)August 2008 08-GrW19 08-MaS19 Water Gr-A Gr-B Bq/L 0.0612 <0.56 Bq/L 0.222 <1.85 Soil Cs- 134 Cs-137 Co-57 Co-60 Mn-54 K-40 Sr-90 Zn-65 Bq/kg Bq/kg Bq/kg Bq/kg Bq/kg Bq/kg Bq/kg Bq/kg 546 2.52 340 157 460 650 1.40-1.53 581 2.8 333 145.0 415 571 (3)(3)407 -755 (2)233 -433 102- 189 291 -540 399 -741 (1)(1)08-RdF19 08-GrF19 08-RdV1 9 AP Cs- 134 Cs-137 Co-57 Co-60 Mn-54 Sr-90 Zn-65 AP Gr-A Gr-B Vegetation Cs-134 Cs-137 Co-57 Co-60 Mn-54 K-40 Sr-90 Zn-65 Bq/sample Bq/sample Bq/sample Bq/sample Bq/sample Bq/sample Bq/sample 2.46 0.0063 1.36 0.0143 2.70 1.42 0.975 Bq/sample

-0.0037 Bq/sample 0.540 2.6300 1.84-3.42 (1)1.50 1.05-1.95 (1)2.64 1.85 -3.43 1.12 0.78-1.46 0.94 0.66- 1.22 (4)0.525 0.263 -0.788 5.5 3.9 -7.2 (1)7.1 5.0-9.2 4.70 3.3-6.1 5.8 4.1-7.5 (1)1.9 1.3-2.5 6.9 4.8 -9.0 A A A A A A A A A A A A A A A W A A A W A A A A A A Bq/sample Bq/sample Bq/sample Bq/sample Bq/sample Bq/sample Bq/sample Bq/sample 4.36-0.03 6.72 4.04 5.22 64.4 1.62 6.160 (1) Not evaluated by MAPEP.(2) Reported a statistically zero result.(3) Designed to test the Safe Drinking Water screening levels. Labs reporting values less than ref values were found to be acceptable.

(4) False positive test.(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.

98 of 206 APPENDIX E EFFLUENT REPORT 99 of 206 100 of 206 TABLE OF CONTENTS INTRO DUCTIO N ....................................................................................................................

1 SUM M ARY .............................................................................................................................

2 1.0. EFFLUENTS

....................................................................................................

3 1.1. G aseous Effl uents to the Atm osphere ................................................

3 1.2. Liquids Released to Rock River .........................................................

3 2.0. SO LID RA DIOACTIVE W ASTE ....................................................................

3 3.0. DO SE TO M AN ................................................................................................

4 3.1. G aseous Effl uent Pathways ................................................................

4 3.1.1. Noble G ases .........................................................................

4 3.1.1.1. G am m a Dose Rates ..............................................

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

4 3.1.2. Radioactive Iodine ...............................................................

5 3.1.2.1. Dose to Thyroid .......................................................

5 3.2. Liquid Effl uent Pathways ....................................................................

5 3.3. Assessm ent of Dose to M em ber of Public ..........................................

6 4.0. SITE M ETEO RO LO GY ..................................................................................

6 101 of 206 Table of Contents (cont.)APPENDIX E-1 DATA TABLES AND FIGURES .............................................................

E-1.1 Station Releases Table 1.1-1 Table 1.2-1 Table 3.1-1 Table 3.2-1 Table 3.4-1 G aseous Effluents

....................................................................

E-1.2 Liq uid E ff lue nts .........................................................................

E -1.3 Maximum Doses Resulting from Airborne Releases .................

E-1.4 Maximum Doses Resulting from Liquid Discharges

..................

E-1.8 Maximum Doses Resulting from Airborne Releases Based On Concurrent Meteorological Data .........................................

E-1.12 ii 102 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, 1-131, and particulate radioactivity in offsite areas are calculated using isotopic composition of effluents 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.

External gamma radiation exposure from noble gases and internal dose from 1-131 in milk are the critical pathways at this site; however, an environmental monitoring program is conducted which also includes other pathways.-1 -103 of 206 i

SUMMARY

Calculations based on gaseous and liquid effluents, Rock River flow 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 3.12E-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 1OCFR50 Appendix I, 1OCFR20 and 40CFR190.There were no additional operational controls implemented which affected the areas of radiological effluents in 2008.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.-2-104 of 206

1.0 EFFLUENTS

1.1 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 1.15E+01 curies of fission and activation gases were released with a maximum average quarterly release rate of 9.32E-01 pCi/sec.A total of 1.21 E-04 curies of 1-131 were released during the year with a maximum average quarterly release rate of 9.35E-06 pCi/sec.A total of 7.35E-06 curies were released as airborne particulate matter with a maximum average quarterly release rate of 3.82E-07 pCi/sec. Alpha-emitting radionuclides were below detectable limits.A total of O.OOE+00 curies of other radioisotopes were released with a maximum average quarterly release rate of 0.OOE+00 pCi/sec.A total of 8.25E+01 curies of tritium were released with a maximum average quarterly release rate of 2.03E+00 pCi/sec.1.2 Liquids Released to Rock River A total of 2.80E+10 liters of radioactive liquid wastes (prior to dilution) containing 1.87E-02 curies (excluding tritium, noble gases and alpha) were discharged from the station. These wastes were released at a maximum quarterly average concentration of 1.25E-09 pCi/ml. A total of 3.OOE+03 curies of tritium were released.

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 2008 Effluent Report.-3-105 of 206 3.0 DOSE TO MAN 3.1 Gaseous Effluent Pathways Table 3.1-1 summarizes the doses resulting from releases of airborne radioactivity via the different exposure pathways.3.1.1 Noble Gases 3.1.1.1 Gamma Dose Rates Offsite Gamma air and whole body dose rates are shown in Table 3.1-1 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 total body dose to an individual would be 1.37E-02 mrem for the year (Table 3.1-1), with an occupancy or shielding factor of 0.7 included.

The maximum total body dose based on measured effluents and concurrent meteorological data would be 1.98E-03 mrem (Table 3.4-1). The maximum gamma air dose was 3.94E-02 mrad (Table 3.1-1) based on measured effluents and average meteorological data, and 3.64E-03 mrad based on concurrent meteorological data (Table 3.4-1).3.1.1.2 Beta Air and Skin Dose Rates The range of beta particles in air is relatively small (on the order of a few meters or less);consequently, plumes of gaseous effluents may be considered "semi-infinite" for purpose of calculating the dose from beta radiation incident on the skin. However, the actual dose to sensitive skin tissues is difficult to calculate due to the effect of the beta particle energies, thickness of inert skin and clothing covering sensitive tissues. For purposes of this report the skin is taken to have a thickness of 7.0 mg/cm 2 and an occupancy factor of 1.0 is used. The skin dose based on concurrent meteorological data for the year was 4.19E-03-4-106 of 206 mrem (Table 3.4-1)The maximum offsite beta air dose for the year, based on measured effluents and average meteorological data, was 2.26E-03 mrad (Table 3.1-1). The beta air dose based on concurrent meteorological data was 2.33E-03 mrad (Table 3.4-1).3.1.2 Radioactive Iodine The human thyroid exhibits a significant capacity to concentrate ingested or inhaled iodine. The minimal levels of radioiodine, 1-131, released during routine operation of the station, may be made available to man resulting in a dose to the thyroid. The principal pathway of interest for this radionuclide is ingestion of radioiodine in milk. Calculations made for 2008 and previous years indicate that contributions to doses from inhalation of 1-131 and 1-133 and ingestion of 1-133 in milk are negligible.

3.1.2.1 Dose to Thyroid The hypothetical thyroid dose to the maximum exposed individual living near the station via ingestion of milk was calculated.

The radionuclide considered was 1-131 and the source of milk was taken to be the nearest dairy farm with the cows pastured from May through October. The maximum thyroid dose was less than 7.80E-02 mrem during the year (Table 3.1-1 [infant]).

3.2 Liquid

Effluent Pathways The three principal pathways through the aquatic environment for potential doses to man from liquid waste are ingestion of potable water, eating aquatic foods, and exposure while on the shoreline.

Not all of these pathways are significant or applicable at a given time or station but a reasonable approximation of the dose can be made by adjusting the dose formula for season of the year or type and degree of use of the aquatic environment.

NRC developed equations*

were used to calculate the doses to the whole body, lower GI tracts, thyroid, bone and skin; specific parameters for use in the equations are given in the Exelon Offsite Dose Calculation Manual. The maximum whole body dose for the year was 2.98E-01 mrem (adult) and no organ dose exceeded 3.34E-01 mrem (Table-5-107 of 206 3.2-1 [adult]).3.3 Assessment of Dose to Member of Public During the period January to December 2008, Byron Station did not exceed the limits below as shown in Table 3.1-1 and Table 3.2-1 (based on yearly average meteorological data), and Table 3.4-1 (based on concurrent 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 unit (1.5 mrem to the whole body or 5 mrem to any organ during any calendar quarter; 3 mrem to the whole body or 10 mrem to any organ during the calendar year).* The RETS limits on air dose in noble gases released in gaseous effluents to a member of the public from each reactor unit (5 mrads for gamma radiation or 10 mrad for beta radiation during any calendar quarter; 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 iodine-131, iodine-133, tritium, and radionuclides in particulate form 'with half-lives greater than eight days in gaseous effluents released from each reactor unit (7.5 mrem to any organ during any calendar quarter; 15 mrem to any organ during any calendar year).The 10CFR20 limit on Total Effective Dose Equivalent to individual members of the public (100 mrem).4.0 SITE METEOROLOGY A summary of the site meteorological measurements taken during each calendar quarter of the year is given in Appendix E. 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 tower as 99.4% during 2008 (Table 3.4-1).*Nuclear Regulatory Commission, Regulatory Guide 1.109 (Rev. 1)-6-108 of 206 APPENDIX E-1 DATA TABLES AND FIGURES E-I1.1 109 of 206 E- 1.2 110 of 206 Table 1.1-1 Byron Station Unit One 2008 EFFLUENT AND WASTE DISPOSAL REPORT TABLE 1A GASEOUS EFFLUENTS

-SUMMATION OF ALL RELEASES Reg Guide 1.21 Unit 1 2008 REPORT FOR 2008 Units QTR 1 QTR 2 QTR 3 QTR 4 YEAR Fission and Activation

1. Total Release 2. Avg. Release Rate Iodine-131

1. Total Release 2. Avg. Release Rate Particulates Half Life 1. Total Release 2. Avg. Release Rate Gases Ci uCi/sec 5.47E-01 2.65E-01 2.23E+00 5.88E-01 3.63E+00 6.96E-02 3.37E-02 2.81E-01 7.40E-02 1.15E-02 Ci 1.72E-05 uCi/sec 2.19E-06 4.24E-06 0.00E+00 0.00E+00 2.15E-05 5.39E-07 0.OOE+00 0.00E+00 6.80E-07>= 8 days Ci 0.00E+00 1.33E-06 0.OOE+00 1.07E-06 2.40E-06 uCi/sec 0.00E+00 1.69E-07 0.OOE+00 1.35E-07 7.59E-08 Tritium 1. Total Release Ci 2. Avg. Release Rate uCi/sec 1.14E+01 7.11E+00 6.44E+00 3.69E+00 2.87E+01 1.46E+00 9.04E-01 8.10E-01 4.64E-01 9.07E-01 Byron Station Unit Two 2008 EFFLUENT AND WASTE DISPOSAL REPORT TABLE 1A GASEOUS EFFLUENTS

-SUMMATION OF ALL RELEASES Reg Guide 1.21 -Unit 2 REPORT FOR 2008 Units QTR 1 QTR 2 QTR 3 QTR 4 YEAR Fission and Activation

1. Total Release 2. Avg. Release Rate Gases Ci uCi/sec Iodine-131

1. Total Release Ci 2. Avg. Release Rate uCi/sec Particulates Half Life >= 8 days 1. Total Release Ci 2. Avg. Release Rate uCi/sec Tritium 1. Total Release Ci 2. Avg. Release Rate uCi/sec 2.30E-01 2.25E-01 8.80E-04 7.41E+00 7.87E+00 2.93E-02 2.86E-02 1.lE-04 9.32E-01 2.49E-01 2.36E-05 7.36E-05 0.OOE+00 2.17E-06 9.93E-05 3.OOE-06 9.35E-06 0.OOE+00 2.73E-07 3.14E-06 0.OOE+00 1.91E-06 0.OOE+00 3.04E-06 4.95E-06 0.00E+00 2.43E-07 0.OOE+00 3.82E-07 1.56E-07 1.19E+01 1.60E+01 1.45E+01 1.14E+01 5.38E+01 1.52E+00 2.03E+00 1.83E+00 1.43E+00 1.70E+00 E -1.3 111 of 206 Table 1.2-1 Byron Station Unit One 2008 EFFLUENT AND WASTE DISPOSAL REPORT TABLE 2A LIQUID EFFLUENTS

-SUMMATION OF ALL RELEASES Reg Guide 1.21 -Unit 1 2008 REPORT FOR 2008 Units Fission and Activation Gases 1. Total Release Ci 2. Avg. Diluted Conc. uCi/ml Tritium 1. Total Release Ci 2. Avg. Diluted Conc. uCi/ml Dissolved and Entrained Gases 1. Total Release Ci 2. Avg. Diluted Conc. uCi/ml Gross Alpha Radioactivity

1. Total Release Ci Volume of liquid waste liters Volume of dil. water liters QTR 1 QTR 2 QTR 3 2.21E-03 1.55E-03 2.12E-03 6.81E-10 4.52E-10 5.24E-10 QTR 4 YEAR 4.06E-03 9.35E-03 1.25E-09 6.68E-10 4.77E+02 1.98E+02 5.75E+02 2.50E+02 1.50E+03 1.47E-04 5.77E-05 1.42E-04 7.67E-05 1.07E-04 8.45E-03 5.40E-04 2.73E-04 5.10E-04 9.75E-03 2.61E-09 1.57E-10 6.75E-11 1.57E-10 6.99E-10 0.QOE+00 0.OCE+00 0.ODE+0C 0.0QE+00 0.DCE+00 3. 24E+09 0. OOE+00 3.43E+09 0.00E+00 4. 04E+09 0. OE+00 3.26E+09 0. OOE+00 1.40E+I0 0. 0OE+00 Byron Station Unit Two 2008 EFFLUENT AND WASTE DISPOSAL REPORT TABLE 2A LIQUID EFFLUENTS

-SUMMATION OF ALL RELEASES Reg Guide 1.21 -Unit 2 2008 REPORT FOR 2008 Fission and Activation

1. Total Release 2. Avg. Diluted Conc.Tritium 1. Total Release 2. Avg. Diluted Conc.Dissolved and Entrained 1. Total Release 2. Avg. Diluted Conc.Gross Alpha Radioactivi

1. Total Release Volume of liquid waste Volume of dil. water Units QTR 1 QTR 2 QTR 3 QTR 4 YEAR Gases Ci 2.21E-03 1.55E-03 2.12E-03 4.06E-03 9.35E-03 uCi/ml 6.81E-10 4.52E-10 5.24E-10 1.25E-09 6.68E-10 Ci 4.77E+02 1.98E+02 5.75E+02 2.50E+02 1.50E+03 uCi/ml 1.47E-04 5.77E-05 1.42E-04 7.67E-05 1.07E-04 Gases Ci 8.45E-03 5.40E-04 2.73E-04 5.10E-04 9.75E-03 uCi/ml 2.61E-09 1.57E-10 6.75E-ii 1.57E-10 6.99E-10.ty Ci 0.OOE+00 0.O0E+00 0.O0E+00 0.O0E+00 0.OOE+00 liters liters 3.24E+09 0. OE+00 3.43E+09 0. OE+00 4.04E+09 0. COE+00 3.26E+09 0. 00E+00 1.40E+10 0. CCE+00 E -1.4 112 of 206 Table 3.1-1 Byron Station Unit One 2008 40CFR190 URANIUM FUEL CYCLE DOSE REPORT GASEOUS DOSE

SUMMARY

Unit 1 2008 Report for: 2008 Unit Range -From: 1 To: 1 I&P DOSE LIMIT ANALYSIS-------------

Age Annual -Limit Group 2008 -Admin. Any Organ INFANT 2008 -Admin. Total Body CHILD Dose Organ (mrem)THYROID 3.90E-02 TBODY 6.83E-03 NNUAL 2008 Limit (mrem)1.13E+01 1.05E+01 Max % of Limit 3. 47E-01 6. 51E-02 2008 -T.Spc. Any Organ INFANT THYROID 3.90]Receptor:

5 Composite Crit. Receptor -IP Distance:

0.00 (meters) Compass Point: NA Critical Pathway: Grs/Goat/Milk (GMILK)Major Contributors ( 0% or greater to total)Nuclide Percentage H-3 1.36E+01 CO-58 7.29E-04 1-131 8.55E+01 1-132 1.01E-02 1-133 8.81E-01 E-02 1.50E+01 2.60E-01 2008 -T.Spc. Total Body CHILD TBODY 6.83E-03 1.50E+01 4.56E-02 Receptor:

5 Composite Crit. Receptor -IP Distance:

0.00 (meters) Compass Point: NA Critical Pathway: Vegetation (VEG)Major Contributors ( 0% or greater to total)Nuclide Percentage H-3 9.96E+01 CO-58 7.34E-03 1-131 3.69E-01 1-132 3.93E-03 1-133 5.30E-03 E -1.5 113 of 206 Table 3.1-1 (cont.)Byron Station Unit One 2008 40CFR190 URANIUM FUEL CYCLE DOSE REPORT GASEOUS DOSE

SUMMARY

Unit 1 2008 Report for: 2008 Unit Range -From: 1 To: 1 NG DOSE LIMIT ANALYSIS =------------------------------Al Dose Annual -Limit (mrad)2008 -Admin. Gamma 1.97E-02 2008 -Admin. Beta 1.13E-03 NNUAL 2008 Limit (mrad)7.50E+00 1.50E+01 Max % of Limit 2. 63E-01 7. 52E-03 2008 -T.Spc. Gamma Receptor:

4 Composite Crit. Receptor Distance:

0.00 (meters)Nuclide Percentage AR-41 2.97E-02 XE-138 1. 48E-04 KR-85M 2.09E+00 XE-135 2.62E-03 XE-133M 1.02E-04 KR-88 9.75E+01 XE-131M 9.74E-04 XE-133 3.63E-01 1.97E-02 1.OOE+01 1.97E-01-NG Compass Point: NA 2008 -T.Spc. Beta 1.131 Receptor:

4 Composite Crit. Receptor -NG Distance:

0.00 (meters) Compass Point: NA Nuclide Percentage AR-41 4.51E-02 XE-138 3.28E-04 KR-85M 1. 44E+01 XE-135 1.44E-02 XE-133M 1.99E-03 KR-88 8.09E+01 XE-131M 2.98E-02 XE-133 4.65E+00 E-03 2.OOE+01 5.64E-03 E -1.6 114 of 206 Table 3.1-1 (cont.)Byron Station Unit Two 2008 40CFR190 URANIUM FUEL CYCLE DOSE REPORT GASEOUS DOSE

SUMMARY

Unit 2 2008 Report for: 2008 Unit Range -From: 2 To: 2 I&P DOSE LIMIT ANALYSIS Annual -Limit 2008 -Admin. Any Organ 2008 -Admin. Total Body Ag Gr--ANNUAL 2008 e Dose Limit oup Organ (mrem) (mrem)Max % of Limit INFANT CHILD THYROID 3.90E-02 TBODY 6.83E-03 1.13E+01 3.47E-01 1.05E+01 6.51E-02 1.50E+01 2.60E-01 2008 -T.Spc. Any Organ INFANT THYROID 3.90E-02 Receptor:

5 Composite Crit. Receptor -IP Distance:

0.00 (meters) Compass Point: NA Critical Pathway: Grs/Goat/Milk (GMILK)Major Contributors ( 0% or greater to total)Nuclide Percentage H-3 CO-58 1-131 1-132 1-133 1. 36E+01 7.29E-04 8. 55E+01 1.01E-02 8. 81E-01 2008 -T.Spc. Total Body CHILD TBO Receptor:

5 Composite Crit. Receptor -IP Distance:

0.00 (meters) Compas Critical Pathway: Vegetation (VEG)Major Contributors ( .0% or greater to total)Nuclide Percentage H-3 9.96E+01 CO-58 7.34E-03 1-131 3.69E-01 1-132 3.93E-03 1-133 5.30E-03 DY 6.83]s Point: NA E-03 1.50E+01 4.56E-02 E -1.7 115 of 206 Table 3.1-1 (cont.)Byron Station Unit Two 2008 40CFR190 URANIUM FUEL CYCLE DOSE REPORT GASEOUS DOSE

SUMMARY

Unit 2 2008 Report for: 2008 Unit Range -From: 2 To: 2 NG DOSE LIMIT ANALYSIS = ---------------------

ANNUAL 2008 Dose Limit Annual -Limit (mrad) (mrad)2008 -Admin. Gamma 1.97E-02 7.50E+00 2008 -Admin. Beta 1.13E-03 1.50E+01 Max % of Limit 2. 63E-01 7.52E-03 2008 -T.Spc. Gamma Receptor:

4 Composite Crit. Receptor Distance:

0.00 (meters)Nuclide Percentage AR-41 2.97E-02 XE-138 1.48E-04 KR-85M 2.09E+00 XE-135 2.62E-03 XE-133M 1.02E-04 KR-88 9.75E+01 XE-131M 9.74E-04 XE-133 3.63E-01 1.97E-02 1.OOE+01 1.97E-01-NG Compass Point: NA 2008 -T.Spc. Beta 1.13E-03 2.OOE+01 5.64E-03 Receptor:

4 Composite Crit. Receptor -NG Distance:

0.00 (meters) Compass Point: NA Nuclide Percentage AR-41 4.51E-02 XE-138 3.28E-04 KR-85M 1. 44E+01 XE-135 1.44E-02 XE-133M 1.99E-03 KR-88 8.09E+01 XE-131M 2.98E-02 XE-133 4.65E+00 E -1.8 116 of 206 Table 3.2-1 Byron Station Unit One 2008 40CFR190 URANIUM FUEL CYCLE DOSE REPORT LIQUID DOSE

SUMMARY

Unit 1 2008 Report for: 2008 Unit Range -From: 1 To: 1 Liquid Receptor PERIOD DOSE BY ORGAN AND AGE GROUP (mrem)Agegrp Bone Liver Thyroid Kidney Lung ADULT 2.48E-03 1.49E-01 1.47E-01 1.50E-01 1.45E-01 TEEN 2.62E-03 1.13E-01 1.10E-01 1.10E-01 1.09E-01 CHILD 3.26E-03 1.25E-01 1.23E-01 1.22E-01 1.21E-01 INFANT 5.23E-06 5.35E-02 5.36E-02 5.35E-02 5.35E-02----=ANNUAL 2008 GI-LLI Skin 1.67E-01 0.OOE+00 1.24E-01 0.OOE+00 1.27E-01 0.OOE+C0 5.35E-02 0.OOE+00 TB 1.49E-01 1. 12E-01 1.23E-01 5 .35E-02 Max % of Limit 2. 22E+00 6. 61E+00 SITE DOSE LIMIT ANALYSIS Annual -Limit 2008 -Admin. AnyOrgan 2008 -Admin. Total Body Age Group Organ A Dose (mrem)1. 67E-01 1. 49E.-01 NNUAL 2008 Limit (mrem)7.50E+00 2.25E+00 ADULT ADULT GILLI TBODY 2008 -T.Spc. Any Organ ADULT GILLI Critical Pathway: Fresh Water Fish -Sport (FFSP)Major Contributors ( 0%. or greater to total)Nuclide Percentage H-3 8.67E+01 MN-54 7.41E-01 FE-59 6.57E-02 CO-58 4.74E+00, CO-60 3.06E+00.NB-95 1.77E+0.0 AG-11OM 1.52E-03 TE-125M 2.86E+00 1-131 6.79E-04 1-133 1.33E-03 CS-134 3.16E-02 2008 -T.Spc. Total Body ADULT TBODY Critical Pathway: Fresh Water Fish- Sport (FFSP)Major Contributors ( 0% or greater to total)Nuclide Percentage 1.67E-01 1.00E+01 1.67E+00 1.49E-01 3.OOE+00 4.96E+00 H-3 MN-54 FE-59 CO-58 C0-60 NB-95 AG-I1OM 9. 72E+01 5. 17E-02 8.46E-03 5. 88E-01 4.03E-01 1. 76E-04 2.49E-06 E -1.9 117 of 206 Table 3.2-1 (cont.)Byron Station Unit One 2008 40CFR190 URANIUM FUEL CYCLE DOSE REPORT LIQUID DOSE

SUMMARY

Unit 1 2008 Nuclide Percentage TE-125M 1.08E-01 1-131 1.65E-03 1-133 5.05E-04 CS-134 1.66E+00 E- 1.10 118 of 206 Table 3.2-1 (cont.)Byron Station Unit Two 2008 40CFR190 URANIUM FUEL CYCLE DOSE REPORT LIQUID DOSE

SUMMARY

Unit 2 2008 Report for: 2008 Unit Range -From: 2 To: 2 Liquid Receptor PERIOD DOSE BY ORGAN AND AGE GROUP (mrem)Agegrp Bone Liver Thyroid Kidney Lung ADULT 2.48E-03 1.49E-01-I.47E-01 1.50E-01 1.45E-01 TEEN 2.62E-03 1.13E-01 1.10E-01 1.10E-01 1.09E-01 CHILD 3.26E-03 1.25E-01 1.23E-01 1.22E-01 1.21E-01 INFANT 5.23E-06 5.35E-02 5.36E-02 5.35E-02 5.35E-02----=ANNUAL 2008 GI-LLI Skin 1.67E-01 0.OOE+00 1.24E-01 0.OOE+00 1.27E-01 0.OOE+00 5.35E-02 0.OOE+00 TB 1. 49E-01 1. 12E-01 1.23E-01 5. 35E-02 Max % of Limit 2. 22E+00 6. 61E+00 SITE DOSE LIMIT ANALYSIS ANNUAL 2008 Age Dose Limit Annual -Limit Group Organ (mrem) (mrem)2008 -Admin. Any Organ ADULT GILLI 1.67E-01 7.50E+00 2008 -Admin. Total Body ADULT TBODY 1.49E-01 2.25E+00 2008 -T.Spc. Any Organ ADULT GILLI Critical Pathway: Fresh Water Fish -Sport (FFSP)Major Contributors ( 0% or greater to total)Nuclide Percentage 1.67E-01 l.OOE+01 1.67E+00 H-3 MN-54 FE-59 CO-58 CO-60 NB-95 AG-11OM TE-125M 1-131 1-133 CS-134 8. 67E+01 7. 41E-01 6.57E-02 4.74E+00 3. 06E+00 1.77E+00 1. 52E-03 2.86E+00 6.79E-04 1. 33E-03 3. 16E-02 2008 -T.Spc. Total Body ADULT TBODY Critical Pathway: Fresh Water Fish -Sport (FFSP)Major Contributors ( 0% or greater to total)Nuclide Percentage 1.49E-01 3.OOE+00 4.96E+00 H-3 MN-54 FE-59 CO-58 CO-60 NB-95 AG-11OM 9. 72E+01 5.17E-02 8.46E-03 5. 88E-01 4.03E-01 1. 76E-04 2.49E-06 E -1.11 119 of 206 Table 3.2-1 (cont.)Byron Station Unit Two 2008 40CFR190 URANIUM FUEL CYCLE DOSE REPORT LIQUID DOSE

SUMMARY

Unit 2 2008 Nuclide Percentage TE-125M 1.08E-01 1-131 1.65E-03 1-133 5.05E-04 CS-134 1.66E+00 E- 1.12 120 of 206 Table 3.4-1 Byron Station -Unit 1 MAXIMUM DOSES RESULTING FROM AIRBORNE RELEASES 2008 TYPE OF DOSE GAMMA AIR (mrad)BETA AIR (mrad)WHOLE BODY (mrem)SKIN (mrem)ORGAN (mrem)CRITICAL PERSON CRITICAL ORGAN FIRST QUARTER 4.000E-06(ESE) 1.650E-05(ESE) 1.960E-06( SE)6.120EL06( SE)2.180E-04(ESE)

SECOND QUARTER THIRD QUARTER FOURTH QUARTER ANNUAL 1.480E-06( SE)6. 710E-06 (NNW)9.180E-07( SE)2.800E-06( SE)1.090E-04 (NNW)3.530E-03(SSE) 1.880E-03( NW)1.920E-03(SSE)

3. 920E-03 (SSE)1.240E-04( NW)3.080E-06(SSE) 1.990E-05(NNW) 1.610E-06(SSE) 6.220E-06(SSE) 8.020E-05(NNW) 3.537E-03(SSE) 1.899E-03( NW)1.924E-03(SSE) 3.933E-03(SSE) 4.753E-04(NNW)

Teenager Thyroid Teenager Thyroid Teenager Liver Teenager Liver Teenager Thyroid COMPLIANCE STATUS 10 CFR 50 APP. I QUARTERLY OBJECTIVE

% OF APP. I 10 CFR 50 APP.I YEARLY OBJECTIVE TYPE OF DOSE% OF APP. I GAMMA AIR (mrad) 5.0 0.07 BETA AIR (mrad) 10.0 0.02 WHOLE BODY (mrem) 2.5 0.08 SKIN (mrem) 7.5 0.05 ORGAN (mrem) 7.5 0.00 CRITICAL PERSON Teena CRITICAL ORGAN Thyro Calculation used release data-from the following:

Unit 1 -Vent Date of calculation:

2/17/2009 10.0 20.0 5.0 15.0 15.0 0.04 0.01 0.04 0.03 0.00 ger id Teenager Thyroid E -1.13 121 of 206 Table 3.4-1 (cont.)Byron Station -Unit 2 MAXIMUM DOSES RESULTING FROM AIRBORNE RELEASES 2008 TYPE OF DOSE FIRST QUARTER SECOND QUARTER THIRD QUARTER FOURTH QUARTER ANNUAL GAMMA AIR (mrad)BETA AIR (mrad)WHOLE BODY (mrem)SKIN (mrem)ORGAN (mrem)CRITICAL PERSON CRITICAL ORGAN 1.560E-06(ESE) 6.840E-06(ESE) 1.350E-06( SE)3.120E-06( SE)2.280E-04(ESE) 9.810E-07( SE)5.530E-06(NNW) l.11OE-06( SE)2.620E-06( SE)2.550E-04(NNW) 4.970E-09(SSE) 2.720E-08( NW)2.330E-09(SSE) 9.820E-09(SSE) 2.770E-04( NW)1.030E-04 (SSE)4.210E-04 (NNW)5.580E-05(SSE) 2.540E-04 (WNW)2.420E-04(NNW) 1.048E-04 (SSE)4. 328E-04 (NNW)5.769E-05(SSE) 2.563E-04 (WNW)9.040E-04 (NNW)Teenager Thyroid Teenager Liver Teenager Lung Teenager Thyroid Teenager Lung COMPLIANCE STATUS 10 CFR 50 APP. I 10 CFR 50 APP.I QUARTERLY OBJECTIVE

% OF APP. I YEARLY OBJECTIVE TYPE OF DOSE% OF APP. I GAMMA AIR (mrad)BETA AIR (mrad)WHOLE BODY (mrem)SKIN (mrem)ORGAN (mrem)CRITICAL PERSON CRITICAL ORGAN 5.0 10.0 2.5 7.5 7.5 0.00 0.00 0.00 0.00 0.00 10.0 20.0 5.0 15.0 15.0 0.00 0.00 0.00 0.00 0.01 Teenager Liver Teenager Thyroid Calculation used release data from the following:

Unit 2 -Vent Date of calculation:

2/17/2009 Data Recovery (priority parameters) 99.4%E -1.14 122 of 206 APPENDIX F METEOROLOGICAL DATA 123 of 206 124 of 206 Byron Generating Station Period of Record: January -March 2008 Stability Class -Extremely Unstable -250Ft-3OFt 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 NNE NE ENE E ESE SE SSE S 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0.0 SSW SW WSW W WNW 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0.0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 2 0 0 0 0 1 5 0 0 0 0 8 NW 5 0 0 0 0 7 NNW Variable Total 0 0 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 10 125 of 206 Byron Generating Station Period of Record: January -March 2008 Stability Class -Moderately Unstable -250Ft-3OFt Delta-T (F)Winds Measured at 30 Feet Wind Speed (in mph)Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 2 2 0 0 0 4 NNE 0 1 0 2 0 0 3 NE 0 0 0 0 0 0 0 ENE 0 0 0 0 0 0 0 E 0 0 1 0 0 0 1 ESE 0 0 1 1 0 0 2 SE 0 0 0 1 0 0 1 SSE 0 0 0 0 0 .0 0 S 0 0 0 0 0 0 0 SSW 0 0 0 0 0 0 0 SW 0 0 0 0 0 0 0 WSW 0 0 0 0 0 0 0 W 0 0 3 1 0 1 5 WNW 0 0 1 0 1 0 2 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 3 9 5 1 1 19 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 10 126 of 206 Byron Generating Station Period of Record: January -March 2008 Stability Class -Slightly Unstable -250Ft-3OFt 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 5 3 0 0 9 NNE 0 0 0 2 0 0 2 NE 0 1 1 0 0 0 2 ENE 0 0 0 0 0 0 0 E 0 3 1 0 0 0 4 ESE 0 0 0 1 0 0, 1 SE 0 0 2 1 0 0 3 SSE 0 0 0 0 0 0 0 S 0 0 0 0 0 0 0 SSW 0 0 0 0 0 0 0 SW 0 0 0 0 0 0 0 WSW 0 0 2 3 0 0 5 W 0 2 9 1 9 3 24 WNW 0 2 5 1 2 1 11 NW 0 1 3 0 0 0 4 NNW 0 2 5 2 0 0 9 Variable 0 0 0 0 0 0 0 Total 0 12 33 14 11 4 74 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: 10 127 of 206 Byron Generating Station Period of Record: January -March 2008 Stability Class -Neutral -250Ft-30Ft Delta-T (F)Winds Measured at 30 Feet Wind Speed (in mph)Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 3 21 46 18 0 0 88 NNE 1 30 29 12 0 0 72 NE 6 8 16 5 0 0 35 ENE 5 12 26 6 0 0 49-E 14 38 17 4 0 0 73 ESE 3 15 32 13 0 0 63 SE 3 27 35 .5 0 0 70 SSE 2 14 56 6 0 0 78 S 4. 16 40 26 4 0 9.0 SSW 4 11 16 14 3 0 48 SW 3 20 19 6 1 0 49 WSW 6 22 28 21 8 0 85 W 16 47 67 43 15 0 188 WNW 16 29 103 35 7 0 190 NW 9 41 49 15 0 0 114 NNW 7 44 51 10 0 0 112 Variable 0 0 0 0 0 0 0 Total 102 395 630 239 38 0 1404 Hours of calm in this stability class: 1 Hours of missing wind measurements in this stability class: 2 Hours of missing stability measurements in all stability classes: 10 128 of 206 Byron Generating Station Period of Record: January -March 2008 Stability Class -Slightly Stable -250Ft-3OFt 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 9 9 0 0 0 19 NNE 3 6 2 0 0 0 11 NE 0 4 0 0 0 0 4 ENE 0 6 4 0 0 0 10 E 6 9 4 0 0 0 19 ESE 2 16 15 0 0 40 SE 0 21 10 1 0 0 32 SSE 2 12 37 7 2 0 60 S 0 5 32 17 5 0 59 SSW 2 7 10 6 3 1 29 SW 6 19 9 0 0 0 34 WSW 6 16 7 0 0 0 29 W 8 20 2 5 0 0 35 WNW 11 28 10 1 0 0 50 NW 10 32 9 0 0 0 51 NNW 3 15 1 0 0 0 19 Variable 0 0 0 0 0 0 0 Total 60 225 161 44 10 1 501 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:, 10 129 of 206 Byron Generating Station Period of Record: January -March 2008 Stability Class -Moderately Stable -250Ft-3OFt 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 0 0 0 0 0 0 0 NE 0 0 0 0 0 0 0 ENE 2 1 0 0 0 0 3 E 0 1 0 0 0 0 1 ESE 2 1 3 0 0 0 6 SE 0 2 0 0 0 0 2 SSE 0 5 5 7 0 0 17 S 5 5 2 0 0 0 12 SSW 1 5 1 0 0 0 7 SW 6 3 0 0 0 0 9 WSW 3 2 0 0 0 0 5 W 6 3 0 0 .0 0 9 WNW 9' 0 0 0 0 0 9.NW 12 2 0 0 0 0 14 NNW 3 0 0 0 0 0 3 Variable 0 0 0 0 0 0 0 Total 49 32 11 7 0 0 99 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: 10 130 of 206 Byron Generating Station Period of Record: January -March 2008 Stability Class -Extremely Stable -250Ft-3OFt 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 NNE NE ENE E ESE SE SSE S ssw SSW w WNW NW NNW 0 0 0 0 0 0 1 0 5 5 4 0 4 3 3 2 0 0 0 0 1 0 0 0 0 0 0 1 0 5 11 9 0 0 1 0 0 0 0 23 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 7 0 0 0 0 1 1 17 1 0 0 0 0 0 0 8 15 4 0 5 3 3 2 0 Variable Total 0 27 0 1 0 0 59 Hours of calm in this stability class: Hours of missing wind measurements in this Hours of missing stability measurements in 1 stability class: 0 all stability classes: 10 131 of 206 Byron Generating Station Period of Record: January -March 2008 Stability Class -Extremely Unstable -250Ft-3OFt Delta-T (F)Winds Measured at 250 Feet Wind Speed (in mph)Wind Direction N NNE NE ENE E ESE SE SSE S SSW 1-3 0 0 0 0 0 0 0 0 0 0 0 4-7 8-12 13-18 19-24 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 2 0 0 0 0 0> 24 Total SW WSW W WNW NW 0 0 0 0 0 0 0 1 1 4 NNW 0 0 0 8 Variable Total 0 0 0 0 0 5 0 3 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 10 132 of 206 Byron Generating Station Period of Record: January -March 2008 Stability Class -Moderately Unstable -250Ft-3OFt 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 NNE NE ENE E ESE SE SSE S 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 4 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 2 0 0 0 2 4 3 0 0 1 2 1 0 0 0 0 0 4 3 0 SSW SW WSW W WNW NW NNW 1 Variable Total 0 0 0 8 0 6 0 3 0 19 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 10 133 of 206 Byron Generating Station Period of Record: January -March 2008 Stability Class -Slightly Unstable -250Ft-3OFt Winds Measured at 250 Feet Wind Speed (in mph)Wind Direction 1-3 4-7 8-12 13-18 19-24 N 0 0 2 7 0 NNE 0 0 0 1 1 NE 0 0 1 1 0 ENE 0 0 0 0 0 E 0 0 3 1 0 ESE 0 0 0 1 1 SE 0 0 1 0 0 SSE 0 0 0 1 0 S 0 0 0 0 0 SSW 0 0 0 0 .0 SW 0 0 0 0 0 WSW 0 0 1 3 1 W 0 0 9 3 1 WNW 0 0 5 1 0 NW 0 2 3 2 0 NNW 0 0 '2 6 0 Variable 0 0 0 0 0 Delta-T (F)> 24 0 0 0 0 0 0'0 0 0 0 0-0 5 9 0 0 0 14 Total 9 2 2 0 4 2 1 1 0 0 0 5 18 15 7 8 0 74 Total 0 2 27 27.4 Hours of calm in this stability class: Hours of missing wind measurements in this Hours of missing stability measurements in 0 stability class: 0 all stability classes: 10 134 of 206 Byron Generating Station Period of Record: January -March 2008 Stability.Class

-Neutral -250Ft-3OFt 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 15 20 50 5 .0 93 NNE 1 10 24 35 9 0 79 NE 1 8 6 11 6 0 32 ENE 3 6 9 21 9 1 49 E 4 13 31 19 5 0 72 ESE 3 6 10 18 27 1 65 SE 0 6 13 23 11 0 53 SSE 0 1 10 31 18 0 60 S 2 3. 15 42 27 7 96 SSW 2 3 11 13 12 6 47 SW 2 8 17 11 9 1 48 WSW 3 9 22 24 14 3 75 W 5 27 30 51 28 14 155 WNW 7 10 39 74 22 17 169 NW 5 8 39 64 25 2 143 NNW 1 9 29 42 4 0 85 Variable 0 0. 0 0 0 0 0 Total 42 142 325 529 231 52 1321 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 86 Hours of missing stability measurements in all stability classes: 10 135 of 206 Byron Generating Station Period of Record: January March 2008 Stability Class -Slightly Stable -250Ft-30Ft Delta-T (F)Winds Measured at 250 Feet Wind Direction 1-3 Wind Speed (in mph)4-7 8-12 13-18 19-24 > 24 Total N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW Variable'0 0 0 0 0 0 0 0 0 2 6 2 1 1 3 0 0 1 1 1 11 4 8 9 5 4 4 0 6 4 6 4 6 16 13 15 18 8 0 0 0 1 0 1 0 0 4.4 4 13 19 13 11 10 10 14 5 20 36 4 0 181 1 2 0 0 0 10 9 18 34 13 5 4 7 2 1 0 0 106 0 0 0 0 0 4 0 5 7 9 23 5 4 4 5 2 0 7 0 0 0 0 0 0 0 26 17 11 27 34 41 75 37 22 39 30 41 61 14 0 Total 37 124 39 491 Hours of calm in this stability class: 1 Hours of missing wind measurements in this stability class: 13 Hours of missing stability measurements in all stability classes: 10 136 of 206 Byron Generating Station Period of Record: January -March 2008 Stability Class -Moderately Stable -250Ft-3OFt 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 2 0 0 2 NNE 0 3 1 0 0 0 4 NE 0 1 1 0 0 0 2 ENE 1 0 2 0 0 0 3 E 0 0 1 0 0 0 1 ESE 0 0 0 2 1 0 3 SE 0 0 0 2 2 0 4 SSE 0 1 0 0 0 7 8 S 0 0 3 2 5 3 13 SSW 0 0 1 1 2 1 5 SW 0 3 2 2 0 0 7 WSW 0 2 1 2 0 0 5 W 0 4 3 1 0 0 8 WNW 0 0 13 0 0 0 13 NW 1 2 5 13 0 0 21 NNW 0 0 2. 0 0 0 2 Variable 0 0 0 0 0 0 0 Total 2 16 35 27 10 11 101 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: 10 137 of 206 Byron Generating Station Period of Record: January -March 2008 Stability Class -Extremely Stable -250Ft-30Ft Winds Measured at 250 Feet Delta-T (F)Wind Speed (in mph)Wind Direction N NNE NE ENE E 1-3 0 0 0 1 1 4-7 8-12 13-18 19-24 > 24 Total ESE SE 1 0 0 0 SSE S 0 0 0 0 0 0 0 0 0 0 1 1 6 1 3 1 0 13 0 0 0 1 0 0 0 0 0 2 7 1 0 1 3 2 0 17 0 0 0 0 0 0 1 0 1 2 4 2 0 0 0 0 0 10 0 0 0 0 0 0 0 0 5 1 1 7 8 1 0 0 0 2 1 SSW SW WSW W WNW NW NNW Variable Total 1 0 0 0 0 0 0 0 6 16 4 6 3 6 3 0 59 Hours of calm in this stability class: Hours of missing wind measurements in this Hours of missing stability measurements in 1 stability class: 0 all stability classes: 10 138 of 206 Byron Generating Station Period of Record: April -June 2008 Stability Class -Extremely Unstable -250Ft-3OFt 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 1 0 0 0 0 1 ENE 0 0 0 0 0 0 0 E 0 0 0 0 0 0 0 ESE 0 0 0 0 0 0 0 SE 0 0 0 1 0 0 1 SSE 0 1 0 0 0 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 1 1 2 1 5 W 0 0 3 1 0 0 4 WNW 0 0 1 0 0 0 1 NW 0 0 9 4 0 0 13 NNW 0 0 2 1 0 0 3 Variable 0 0 0 0 0 0 0 Total 0 2 16 8 2 1 29 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 17 139 of 206 Byron Generating Station Period of Record: April -June 2008 Stability Class -Moderately Unstable -250Ft-3OFt 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 1 0 0 0 0 1 ESE 0 0 0 0 0 0 0 SE 0 0 1 3 0 0 4 SSE 0 0 0 2 0 0 2 S 0 0 0 0 0 0 0 SSW 0 0 0 1 0 0 1 SW 0 0 5 0 0 0 5 WSW 0 0 0 3 1 1 5 W 0 0 3 1 0 0 4 WNW 0 1 0 0 0 0 1 NW 0 1 10 3 0 0 14 NNW 0 0 5 1 0 0 6 Variable 0 0. 0 .0 0 0 0 Total 0 3 24 14 1 1 43 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: 17 140 of 206 Byron Generating Station Period of Record: April -June 2008 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 1 0 0 0 0 1 NE 0 0 0 0 0 0 0 ENE 0 0 0 0 0 0 0 E 0 1 5 0 0 0 6 ESE 0 2 1 0 0 0 3 SE 0 1 2 3 1 0 7 SSE 0 1 0 4 0 0 5 S 0 0 3 1 1 0 5 SSW 0 0 3 0 0 0 3 SW 0 1 5 0 0 0 6 WSW 0 3 6 0 1 0 10 W 0 6 0 3 3 0 12 WNW 0 2 4 2 0 0 8 NW 0 1 12 3 0 0 16 NNW 0 1 4 3 0 0 8 Variable 0 0 0 0 0 0 0 Total 0 20 46 19 6 0 91 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: 17 141 of 206 Byron Generating Station Period of Record: April -June 2008 Stability Class -Neutral -250Ft-3OFt 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 23 35 2 3 0 64 NNE 0 16 15 3 3 0 37 NE 0 12 11 16 0 0 39 ENE 1 4 33 8 3 0 49 E 1 15 30 8 0 0 54 ESE 0 9 11 4 1 0. 25 SE 0 12 15 5 2 0 34 SSE 1 11 24 7 4 0 47 S 1 7 33 37 13 0 91 SSW 3 12 14 11 13 4 57 SW 0 17 27 18 3 0 65 WSW 1 14 43 10 5 1 74 W 3 12 20 24 11 3 73 WNW 4 8 28 28 1 0 69 NW 1 23 33 13 0 0 70 NNW 0 18 28 9 1 0 56 Variable 0 0 0 0 0 0 0 Total 17 213 400 203 63 8 904 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 3 Hours of missing stability measurements in all stability classes: 17 142 of 206 Byron Generating Station Period of Record: April -June 2008 Stability Class -Slightly Stable -250Ft-3OFt 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 17 6 0 0 0 25 NNE 3 12 5 2 0 0 22 NE 0 10 9 3 0 0 22 ENE 3 17 17 1 1 0 39 E 7 38 18 3 0 0 66 ESE 2 5 20 5 1 0 33 SE 3 19 31 3 3 0 59 SSE 4 24 46 11 0 0 85 S 3 20 37 33 4 1 98 SSW 4 14 20 17 2 0 57 SW 1 37 25 9 2 0 74 WSW 1 24 11 4 0 0 40 W 7 21 10 7 1 0 46 WNW 7 14 10 1 0 0 32 NW 5 33 4 0 0 0 42 NNW 5 28 8 0 0 0 41 Variable 0 0 0 0 0 0 0 Total 57 333 277 99 14 1 781 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: 17 143 of 206 Byron Generating Station Period of Record: April -June 2008 Stability Class -Moderately Stable -250Ft-3OFt Delta-T (F)Winds Measured at 30 Feet Wind Speed (in mph)Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 1 2 0 0 0 0 3 NNE 1 2 1 0 0 0 4 NE 0 0 0 0 0 0 0 ENE 0 1 3 0 0 0 4 E 7 15 0 0 0 0 22 ESE 3 13 2 0 0 0 18 SE 6 12 9 0 0 0 27 SSE 1 18 6 1 0 0 26 S 1 20 0 2 0 0 23 SSW 4 9 1 0 0 0 14 SW 3 4 0 0 0 0 7 WSW 4 2 0 0 0 0 6 W 11 8 0 0 0 0 19 WNW 10 9 0 0 0 0 19 NW 10 11 0 0 0 0 21 NNW 11 4 0 0 0 0 15 Variable 0 0 0 0 0 0 0 Total 73 130 22 3 0 0 228 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: 17 144 of 206 Byron Generating Station Period of Record: April -June 2008 Stability Class -Extremely Stable -250Ft-3OFt Delta-T (F)Winds Measured at 30 Feet Wind Direction 1-3 N 0 NNE 0 NE 0 ENE 1 E 1 ESE 1 SE 3 SSE 2 S 2 SSW 5 SW 3 WSW 7 W 9 WNW 7 NW 5 NNW 1 Variable 0 Total 47 Wind Speed (in mph)4-7 8-12 13-18 19-24 > 24 Total 1 0 0 0 2 5 5 6 10 1 2 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 3 6 8 9 1 12 6 5 7 9 7 0.30 34 0 0 1 0 0 0 6 2 0 82 Hours of calm in Hours of missing Hours of missing this stability class: 1 wind measurements in this stability class: 1 stability measurements in all stability classes: 17 145 of 206 Byron Generating Station Period of Record: April -June 2008 Stability Class -Extremely Unstable -250Ft-3OFt 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 1 0 0 0 1 ENE 0 0 0 0 0 0 0 E 0 0 0 0 0 0 0 ESE 0 0 0 0 0 0 0 SE 0 0 0 0 1 0 1 SSE 0 1 0 0 0 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 2 1 3 6 W 0 0 1 1 1 0 3 WNW 0 0 1 0 0 0 1 NW 0 0 1 8 4 0 13 NNW 0 0 1 1 1 0 3 Variable 0 0 0 0 0 0 0 Total 0 1 5 12 8 3 29 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 17 146 of 206 Byron Generating Station Period of Record: April -June 2008 Stability Class -Moderately Unstable -250Ft-3OFt 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 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 1 0 0 0 1 ESE 0 0 0 0 0 0 0 SE 0 0 1 0 3 0 4 SSE 0 0 0 1 1 0 2 S 0 0 0 0 0 0 0 SSW 0 0 0 1 0 0 1 SW 0 0 1 4 0 0 5 WSW 0 0 0 4 0 2 6 W 0 0 0 2 1. 0 3 WNW 0 1 0 0 0 0 1 NW 0 0 4 11 3 0 18 NNW 0 0 0 1 1 0 2 Variable 0 0 0 0 0 0 0 Total 0 1 7 24 9 2 43 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: 17 147 of 206 Byron Generating Station Period of Record: April -June 2008 Stability Class -Slightly Unstable -250Ft-3OFt 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 1 0 0 0 0 1 NE 0 0 0 0 0 0 0 ENE 0 0 0 0 0 0 0 E 0 2 2 4 0 0 8 ESE 0 0 1 2 0 0 3 SE 0 0 1 1 2 1 5 SSE 0 1 0 2 2 0 5 S 0 0 0 4 1 0 5 SSW 0 0 3 1 0 0 4 SW 0 2 3 1 0 0 6 WSW 0 2 1 5 0 3 11 W 0 4 3 1 3 0 11 WNW 0 2 2 1 2 0 7 NW 0 1 4 9 5 0 19 NNW 0 0 3 1 1 0 5 Variable 0 0 0 0 0 0 0 Total 0 15 24 32 16 4 91 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: 17 148 of 206 Byron Generating Station Period of Record: April -June 2008 Stability Class -Neutral -250Ft-3OFt 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 20 27 0 4 59 NNE 1 7 9 16 3 3 39 NE 0 4 9 9 17 0 3.9 ENE 0 4 10 25 4 1 44 E 0 7 23 17 14 4 65 ESE 0 6 10 4 2 1 23 SE 0 7 10 12 5 4 38 SSE 0 6 10 19 9 4 48 S 1 5 7 32 24 16 85 SSW 1 7 10 9 11 16 54 SW 1 7 12 25 19 4 68 WSW 2 6 20 36 9 5 78 W 2 7 14 19 15 12 69 WNW 1 7 13 21 25 2 69 NW 1 13 17 25 14 1 71 NNW 0 7 20 20 5 3 55 Variable 0 0 0 0 0 0 0 Total 11 107 214 316 176 80 904 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 3 Hours of missing stability measurements in all stability classes: 17 149 of 206 Byron Generating Station Period of Record: April -June 2008 Stability Class -Slightly Stable -250Ft-30Ft Delta-T (F)Winds Measured at 250 Feet Wind Direction 1-3 Wind Speed 4-7 8-12 (in mph)13-18 19-24> 24 Total N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW Variable 6 12 10 15 16 2 2 8 12 10 16 13 20 10 13 22 0 11 10 10 18 25 10 13 24 28 30 35 21 20 15 22 21 0 313 2 2 0 4 8 12 18 34 28 22 10 7 7 2 0 0 0 0 0 3 1 1 4 11 9 24 5 10 2 1*0 0 0 0 22 28 27 44 58 29 50 80 94 69 72 45 50 30 39 45 0 Total 10 45 187 156 71 782 Hours of calm in this stability class: Hours of missing wind measurements in this Hours of missing stability measurements in 0 stability class: 0 all stability classes: 17 150 of 206 Byron Generating Station Period of Record: April -June 2008 Stability Class -Moderately Stable -250Ft-3OFt 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 4 2 0 0 6 NNE 0 2 1 3 0 0 6 NE 0 0 0 1 1 0 2 ENE 0 2 4 0 1 0 7 E 0 2 6 2 1 0 11 ESE 1 1 1 4 6 2 15 SE 0 0 4 14 6 0 24 SSE 0 0 2 11i 4 3 20 S 0 0 2 14 1 2 19 SSW 0 0 6 15 1 0 22 SW 0 2 4 11 1 0 18 WSW 0 2 1 2 0 0 5 W 0 0 1 5 0 0 6 WNW 0 3 7 13 0 0 23 NW 0 5 10 14 0 0 29 NNW 0 3 6 9 0 0 18 Variable 0 0 0 0 0 0 0 Total 1 22 59 120 22 7 231 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: 17 151 of 206 Byron Generating Station Period of Record: April -June 2008 Stability Class -Extremely Stable -250Ft-3OFt 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 2 1 0 0 3 NNE 0 0 0 0 0 0 0 NE 0 0 0 0 0 0 0 ENE 0 2 0 0 0 0 2 E 1 1 0 0 0 0 2 ESE 1 2 3 2 0 0 8 SE 0 1 2 *2 0 0 5 SSE 1 4 0 4 0 1 10 S 0 2 2 4 0 0 8 SSW 0 1 2 3 0 0 6 SW 0 2 1 1 0 0 4 WSW 0 2 6 3 0 0 11 W 0 2 2 4 0 0 8 WNW 0 2 1 0 0 0 3 NW 0 2 3 3 0 0 8 NNW 0 0 4 2 0 0 6 Variable 0 0 0 0 0 0 0 Total 3 23 28 29 0 1 84 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 17 152 of 206 Byron Generating Station Period of Record: July -September 2008 Stability Class -Extremely Unstable -250Ft-3OFt 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 1 0 0 0 0 1 E 0 3 1 0 0 0 4 ESE 0 0 0 0 0 0 0 SE 0 0 0 0 0 0 0 SSE 0 0 0 0 0 0 0 S 0 0 0 0 0 0 0 SSW 0 0 1 0 0 0 1 SW 0 1 0 0 0 0 1 WSW 0 0 0 0 0 0 0 W 0 0 2 0 0 0 2 WNW 0 0 0 0 0 0 0 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 5 5 0 0 0 10 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class:. 0 Hours of missing stability measurements in all stability classes: 5 153 of 206 Byron Generating Station Period of Record: July -September 2008 Stability Class -Moderately Unstable -250Ft-3OFt 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 2 0 0 0 3 NNE 0 0 0 0 0 0 0 NE 0 0 0 0 0 0 0 ENE 0 1 2 0 0 0 3 E 0 4 0 0 0 0 4 ESE 0 3 1 0 0 0 4 SE 0 0 0 0 0 0 0 SSE 0 1 0 0 0 0 1 S 0 0 2 0 0 0 2 SSW 0 1 2 0 0 0 3 SW 0 3 5 0 0 0 8 WSW 0 0 4 0 0 0 4 W 0 0 2 0 0 0 2 WNW 0 0 0 0 0 0 0 NW 0 1 0 0 0 0 1 NNW 0 2 2 0 0 0 4 Variable 0 0 0 0 0 0 0 Total .0 17 22 0 0 0 39 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 1 Hours of missing stability measurements in all stability classes: 5 154 of 206 Byron Generating Station Period of Record: July -September 2008 Stability Class -Slightly Unstable -250Ft-3OFt 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 4 0 0 0 7 NNE 0 0 0 0 0 0 0 NE 0 1 0 0 0 0 1 ENE 0 1 2 0 0 0 3 E 0 7 1 0 0 0 8 ESE 0 4 1 0 0 0 5 SE 0 1 2 0 0 0 3 SSE 0 6 4 0 0 0 10 S 0 1. 5 0 0 0 6 SSW 0 1 0 0 0 0 1 SW 0 5 3 0 0 0 8 WSW 0 6 2 0 0 0 8 W 0 4 6 0 0 0 10 WNW 0 3 2 0 0 0 5 NW 1 1 4 0 0 0 6 NNW 0 5 2 0 0 0 7 Variable 0 0 0 0 0 0 0 Total 1 49 38 0 0 0 88 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 1 Hours of missing stability measurements in all-stability classes: 5 155 of 206 Byron Generating Station Period of Record: July -September 2008 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 44 23 0 0 0 71 NNE 5 21 17 0 0 0 43 NE 5 18 11 0 0 0 34 ENE 4 15 3 0 0 0 22 E 3 19 0 0 0 0 22 ESE 3 18 5 0 0 0 26 SE 2 29 5 0 0 0 36 SSE 3 29 22 0 0 0 54 S 0 24 36 6 0 0 66 SSW 1 16 17 7 0 0 41 SW 3 41 26 1 0 0 71 WSW 3 40 17 1 0 0 61 W 4 36 21 3 0 0 64 WNW 7 34 13 6 0 0 60 NW 7 35 10 0 0 0 52 NNW 6 3.7 23 0 0 0 66 Variable 0 0 0 0 0 0 0 Total 60 456 249 24 0 0 789 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 4 Hours of missing stability measurements in all stability classes: 5 156 of 206 Byron Generating Station Period of Record: July -September 2008 Stability Class -Slightly Stable -250Ft-3OFt 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 15 2 0 0 0 25 NNE 4 13 7 1 0 0 25 NE 5 9 4 0 0 0 18 ENE 6 25 9 0 0 0 40 E 5 29 2 0 0 0 36 ESE 4 14 3 0 0 0 21 SE 7 24 7 0 0 0 38 SSE 5 21 13 0 0 0 39 S 13 27 21 0 0 0 61 SSW 10 28 18 1 0 0 57 SW 9 45 9 1 0 0 64 WSW 13 38 6 0 0 0 57 W 10 35 2 0 0 0 47 WNW 16 17 3 0 0 0 36 NW 14 27 0 0 0 0 41 NNW 16 26 1 0 0 0 43 Variable 0 0 0 0 0 0 0 Total 145 393 107 3 0 0 648 Hours of calm in this stability class: 7 Hours of missing wind measurements in this stability class: 6 Hours of missing stability measurements in all stability classes: 5 157 of 206 Byron Generating Station Period of Record: July -September 2008 Stability Class -Moderately Stable -25OFt-3OFt Winds Measured at 30 Feet Wind Speed (in mph)Wind Direction 1-3 4-7 8-12 13-18 19-24 Delta-T (F)> 24 Total N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW Variable Total 8 1 1 5 6 5 4 5 17 14 8 11 14 16 23 12 0 150 5 3 0 4 36 22 22 27 23 15 10 3 7 2 3 19 0 201 0 2 0 2 0 1 5 2 3 2 0 0 0 0 0 0 0 17 13 6 1 11 42 28 31 34 43 31 18 14 21 18 26 31 0 0 368 Hours of calm in Hours of missing Hours of missing this stability class: 10 wind measurements in this stability class: 6 stability'measurements in all stability classes: 5 158 of 206 Byron Generating Station Period of Record: July -September 2008 Stability Class -Extremely Stable -250Ft-3OFt 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 0 0 0 0 0 2 NNE 1 1 0 0 0 0 2 NE 1 0 0 0 0 0 1 ENE 0 0 0 0 0 0 0 E 5 9 0 0 0 0 14 ESE 9 29 1 0 0 0 39 SE 9 25 0 0 0 0 34 SSE 8 18 0 0 0 0 26 S 13 12 0 0 0 0 25 SSW 13 1 0 0 0 0 14 SW 3 0 0 0 0 0 3 WSW 9 0 0 0 0 0 9 W 11 0 0 0 0 0 11 WNW 10 0 0 0 0 0 10 NW 16 1 0 0 0 0 .17 NNW 7 0 0 0 0 0 7 Variable 0 0 0 0 0 0 0 Total 117 96 1 0 0 0 214 Hours of calm in this stability class: 8 Hours of missing wind measurements in this stability class: 4 Hours of missing stability measurements in all stability classes: 5 159 of 206 Byron Generating Station Period of Record: July -September 2008 Stability Class -Extremely Unstable -250Ft-3OFt 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 1 E 0 1 3 0 0 0 4 ESE 0 0 0 0 0 0 0 SE 0 0 0 0 0 0 0 SSE 0 0 0 0 0 0 0 S 0 0 0 0 0 0 0 SSW 0 0 1 0 0 0 1 SW 0 0 1 0 0 0 1 WSW 0 0 0 0 0 0 0 W 0 0 2 0 0 0 2 WNW 0 0 0 0 0 0 0 NW 0 0 0 1 0 0 1 NNW 0 0 0 0 0 0 0 Variable 0 0 0 0 0 0 0 Total 0 1 8 1 0 0 10 Hours of calm in this stability class: 0 Hours of-missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 5 160 of 206 Byron Generating Station Period of Record: July -September 2008 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 3 0 0 0 3 NNE 0 0 0 0 0 0 0 NE 0 0 0 0 0 0 0 ENE 0 0 3 0 0 0 3 E 0 0 5 0 0 0 5 ESE 0 2 0 1 0 0 3 SE 0 0 0 0 0 0 0 SSE 0 0 1 0 0 0 1 S 0 0 2 1 0 0 3 SSW 0 0 1 0 0 0 1 SW 0 0 6 2 0 0 8 WSW 0 1 3 1 0 0 5 W 0 0 1 1 0 0 2 WNW 0 0 0 0 0 0 0 NW 0 1 0 1 0 0 2 NNW 0 0 3 0 0 0 3 Variable 0 0 0 0 0 0 0 Total 0 4 28 7 0 0 39 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 1 Hours of missing stability measurements in all stability classes: 5 161 of 206 Byron Generating Station Period of Record: July -September 2008 Stability Class -Slightly Unstable -250Ft-3OFt 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 6 1 0 0 7 NNE 0 1 0 0 0 0 1 NE 0 1 0 0 0 0 1 ENE 0 0 -5 0 0 0 5 E 0 2 3 0 0 0 5 ESE 0 3 2 1 0 0 6 SE 0 1 5 1 0 0 7 SSE 0 1 4 2 0 0 7 S 0 0 2 3 0 0 5 SSW 0 0 2 0 0 0 2 SW 0 2 5 1 0 0 8 WSW 0 1 4 0 0 0 5 W 0 1 9 2 0 0 12 WNW 0 4 1 1 0 0 6 NW 0 2 3 1 0 0 6 NNW 0 2 2 1 0 0 5 Variable 0 0 0 0 0 0 0 Total 0 21 53 14 0 0 88 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 1 Hours of missing stability measurements in all stability classes: 5 162of 206 Byron Generating Station Period of Record: July -September 2008 Stability Class -Neutral -25OFt-3OFt Winds Measured at 250 Feet Wind Speed (in mph)Wind Delta-T (F)Direction 1-3 N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW Variable 4-7 23 14 12 11 13 13 7 5 8 6 8 15 10 13 18 10 0 8-12 13-18 19-24 > 24 Total 37 21 7 8 9 9 22 29 18 11 40 26 45 28 23 25 0 13 5 10 4 0 7 6 16 33*14 24 10 9 7 14 17 0 75 40 36 25 22 30 38 51 64 37 76 53 69 56 60 57 0 Total 21 186 358 189 32 3 789 Hours of calm in this stability class: Hours of missing wind measurements in this Hours of missing stability measurements in 0 stability class: 4 all stability classes: 5 163 of 206 Byron Generating Station Period of Record: July -September 2008 Stability Class -Slightly Stable -250Ft-3OFt 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 9 5 0 0 16 NNE 2 5 16 11 2 0 36 NE .2 2 4 10 3 0 21 ENE 4 2 13 14 4 0 37 E 1 6 18 17 1 0 43 ESE 0 5 6 10 4 0 25 SE 2 3 10 8 2 0 25 SSE 1 1 6 12 14 0 34 S 1 3 15 29 8 0 56 SSW 1 4 17 25 8 0 55 SW 1 2 25 27 3 0 58 WSW 3 5 35 22 0 0 65 W 1 4 40 8 0 0 53 WNW 3 5 22 8 1 0 39 NW 1 11 24 17 0 0 53 NNW 1 7 20 13 0 0 41 Variable 0 0 0 0 0 0 0 Total 24 67 280 236 50 0 657 Hours of calm in this stability class: 3 Hours of missing wind measurements in this stability class: 1 Hours of missing stability measurements in all stability classes: 5 164 of 206 Byron Generating Station Period of Record: July -September 2008 Stability Class -Moderately Stable -250Ft-3OFt 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 3 6 12 0 0 22 NNE .1 3 7 5 2ý 0 18 NE 0 2 4 0 0 0 6 ENE 1 3 2 0 1 0 7 E 0 2 14 13 2 0 31 ESE 0 3 4 14 15 0 36 SE 1 1 4 6 17 2 31 SSE 1 2 4 7 5 1 20 S 1 4 5 13 3 0 26 SSW 0 1 16 15 3 0 35 SW 1 2 9 21 0 0 33 WSW 2 1 .9 6 0 0 18 W 0 5 11 16 0 0 32.WNW 1 2 8 6 1 0 18 NW 1 1 13 8 0 0 23 NNW 0 5 14 8 0 0 27 Variable 0 0 0 0 0 0 0 Total 11 40 130 150 49 3 383 Hours of calm in this stability class: 1 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 5 165 of 206 Byron Generating Station Period of Record: July -September 2008 Stability Class -Extremely Stable -250Ft-3OFt 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 NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW 0 2 3 0 2 3 8 4 3 10 8 2 1 4 3 1 4 12 27 5 9 10 7 0 3 1 4 1 0 92 0 0 0 0 2 4 11 7 2 0 0 0 0 0 0 0 0 26 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 9 7 2 8 20 47 21 16 23 20 5 2 2 3 1 14 NW 3 5 7 8 13 11 NNW 2 Variable Total 0 10 0 28 0 69 0 0 225 Hours of calm in this stability class: Hours of missing wind measurements in this Hours of missing stability measurements in 1 stability class: 0 all stability classes: 5 166 of 206 Byron Generating Station Period of Record: October -December2008 Stability Class -Extremely Unstable -250Ft-3OFt 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 2 0 0 0 2 NNE 0 2 2 0 0 0 4 NE 0 0 0 .0 0 0 0 ENE 0 1 0 0 0 0 1 E 0 1 0 0 0 0 1 ESE 0 0 1 0 0 0 1 SE 0 0 0 0 0 0 0 SSE 0 0 0 0 0 0 0 S 0 0 0 0 0 0 0 SSW 0 0 0 0 0 0 0 SW 0 0 0 0 0 0 0 WSW 0 0 0 0 0 0 0 W 0 0 1 0 1 0 2 WNW 0 0 7 0 0 0 7 NW 0 1 2 0 0 0 3 NNW 0 0 0 0 0 0 0 Variable 0 0 0 0 0 0 0 Total 0 5 15 0 1 '0 21 Hours of calm in this-stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 0 167 of 206 Byron Generating Station Period of Record: October -December2008 Stability Class -Moderately Unstable -250Ft-3OFt 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 2 0 0 0 0 2 NE 0 0 0 0 0 0 0 ENE 0 0 0 0 0 0 0 E 0 2 0 0 0 0 2 ESE 0 2 1 1 0 0 4 SE 0 0 1 0 0 0 1 SSE 0 1 0 0 0 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 0 0 0 0 W 0 1 1 2 2 0 6 WNW 0 0 4 0 0 0 4 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 8 9 3 2 0 22 Hours of calm in this stability class: 0.Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 0 168 of 206 Byron Generating Station Period of Record: October -December2008 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 4 2 0 0 0 6 NNE 0 0 0 0 0 0 0 NE 0 1 0 0 0 0 1 ENE 0 0 0 0 0 0 0 E 0 0 0 0 0 0 0 ESE 0 0 2 0 0 0 2 SE 0 1 3 0 0ý 0 4 SSE 0 2 1 0. 0 0 3 S 0 1 2 0 0 0 3 SSW 0 2 1 0 0 0 3 SW 0 0 1 0 0 0 1 WSW 0 0 0 '1 0 0 1 W 0 1 3 2 2 0 8 WNW 0 1 2 0 0 0 3 NW 0 2 3 0 0 0 5 NNW 0 2 1 0 0 0 3 Variable .0 0 0 0 0 0 0 Total 0 17 21 3 2 0 43 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes:.

0 169 of 206 Byron Generating Station Period of Record: October -December2008 Stability Class -Neutral -250Ft-3OFt 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 19 24 22 0 0 66 NNE 2 8 3 5 0 0 18 NE 1 7 0 0 0 0 8 ENE 0 4 8 4 0 0 16 E 2 14 6 0 0 0 22 ESE 3 6 20 23 0 0 52 SE 0 9 38 11 0 0 58 SSE 2 10 28 15 2 0 57 S 1 17 50 27 11 0 /106 SSW 0 6 34 17 6 0 63 SW 1 15 24 5 0 0 45 WSW 2 16 20 7 1 0 46 W 3 20 54 35 32 3 147, WNW 2 18 59 24 10 0 113 NW 5 31 59 16 0 0 i1 NNW 3 33 65 41 0 0 142.Variable 0 0 0 0 0 0 0 Total 28 233 492 252 62 3 1070 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 15 Hours of missing stability measurements in all stability classes: 0 170 of 206 Byron Generating Station Period of Record: October -December2008 Stability Class -Slightly Stable -250Ft-3OFt 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 10 9 8 0 0 30 NNE 0 5 2 0 0 0 7 NE 3 5 0 0 0 0 8 ENE 2 4 11 0 0 0 17 E 1 36 8 0 0 0 45 ESE 0 29 28 0 0 0 57 SE 2 15 5 1 0 0 23 SSE 1 19 29 26 2 0 77 S 2 35 35 23 11 0 106 SSW 2 27 39 13 0 0 81 SW 5 18 11 0 0 0 34 WSW 3 11 6 2 0 0 22 W 9 30 18 1 0 0 58 WNW 6 27 12 1 0 0 46 NW 12 32 17 5 0 0 66 NNW 2 29 4 1 0 0 36 Variable 0 0 0 0 0 0 0 Total 53 332 234 81 13 0 713 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: 0 171 of 206 Byron Generating Station Period of Record: October -December2008 Stability Class -Moderately Stable -250Ft-3OFt 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 5 0 0 0 0 7 NNE 0 4 0 0 0 0 4 NE 0 0 0 0 0 0 0 ENE 1 3 1 0 0 0 5 E 4 20 1 0 0 0 25 ESE 7 16 4 0 0 0 27 SE 0 14 2 0 0 0 16 SSE 1 20 20 3 0 0 44 S 7 11 7 4 0 0 29 SSW 1 5 0 0 0 0 6 SW 5 3 0 0 0 0 8 WSW 2 3 0 0 0 0 5 W 12 13 0 0 0 0 25 WNW 10 3 0 0 0 0 13 NW 4 1 0 0 0 0 5 NNW 7 2 0 0 0 0 9 Variable 0 0 0 0 0 0 0 Total 63 123 35 7 0 0 228 Hours of calm in this stability class: 1 Hours of missing wind measurements in this stability class: 2 Hours of missing stability measurements in all stability classes: 0 172 of 206 Byron Generating Station Period of Record: October Stability Class -Extremely Stable Winds Measured at-December2008

-250Ft-3OFt Delta-T (F)30 Feet Wind Speed (in mph)Wind Direction 1-3 N 4 4-7 8-12 13-18 19-24> 24 Total NNE NE ENE E ESE SE SSE S 0 1 0 2 0 1 2 5 4 0 0 0 6 7 5 1 0 0 1 5 8 11 2 SSW SW WSW 0 0 0 0 0 0 W 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 12 13 7 5 1 1 7 8 WNW 0 0 0 0 0 0 0 0 5 0 0 0 6 7 5 0 NW NNW Variable Total 0 37 0 40 78 Hours of calm in Hours of missing Hours of missing this stability class: 7 wind measurements in this stability class: 4 stability measurements in all stability classes: 0 173 of 206 Byron Generating Station Period of Record: October -December2008 Stability Class -Extremely Unstable -25OFt-3OFt Winds Measured at 250 Feet Wind Speed (in mph)Wind Direction 1-3 4-7 8-12 13-18 19-24 Delta-T (F)> 24 Total N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW Variable Total 1 0 0 0 0 1 0 0 0 0 0 0 2 5 1 0 0 10 21 Hours of calm in this stability class: Hours of missing wind measurements in this Hours of missing stability measurements in 0 stability class: 0 all stability classes: 0 174 of 206 Byron Generating Station Period of Record: October -December2008-Stability Class -Moderately Unstable -250Ft-3OFt 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 1 0 0 0 1 NE 0 0 1 0 0 0 1 ENE 0 1 0 0 0 0 1 E 0 0 1 0 .0 0 1 ESE 0 1 1 1 1 0 4 SE 0 0 0 1 0 0 1 SSE 0 1 0 0 0 0 1 5 0 0 0 0 0 0 0 SSW 0 0 0 0 0 0 0 SW 0 0 0 0 0 0 0 WSW 0 0 0 0 0 0 0 W 0 0 1 1 4 0 6 WNW 0 0 0 5 0 0 5 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 3 5 9 5 0 22 Hours of calm in.this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 0 175 of 206 Byron Generating Station Period of Record: October -December2008 Stability Class -Slightly Unstable -250Ft-3OFt 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 2 2 0 0 5 NNE 0 0 0 0 0 0 0 NE 0 0 1 0 0 0 1 ENE 0 0 0 0 0 0 0 E 0 0 0 0 0 0 0 ESE 0 0 0 1 1 0 2 SE 0 1 0 3 1 0 5 SSE 0 2 0 0 0 0 2 S 0 1 0 2 0 0 3 SSW 0 1 1 1 0 0 3 SW 0 0 0. 1 0 0 1 WSW 0 0 0 1 0 0 1 W 0 2 1 3 2 1 9 WNW 0 0 1 1 0 0 2 NW 0 1 5 0 0 0 6 NNW 0 0 3 0 0 0 3 Variable 0 0 0 0 0 0 0 Total 0 9 14 15 4 1 43 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 0 176 of 206 Byron Generating Station Period of Record: October -December2008 Stability Class -Neutral -250Ft-3OFt 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 7 17 22 16 1 65 NNE 2 1 8 4 10 0 25 NE 0 2 4 0 0 0 6 ENE 1 1 7 4 3 0 16 E 1 7 7 9 4 0 28 ESE 0 2 3 15 25 8 53 SE 0 5 7 24 18 2 56 SSE 0 3 14 17 9 8 51 S 0 3 22 44 23 15 107 SSW 0 1 15 30 11 7 64 SW 0 6 15 19 10 0 50 WSW 2 8 17 14 9 3 53 W 2 .8 27 58 22 34 151 WNW 1 4 20 50 24 9 108 NW 0 13 27 42 23 1 106 NNW 0 12 27 60 33 1 133 Variable 0 0 0 0 0 0 0 Total 11 83 237 412 240 89 1072 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 13 Hours of missing stability measurements in all stability classes: 0 177 of 206 Byron Generating Station Period of Record: October -December2008 Stability Class -Slightly Stable -250Ft-3OFt 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 17 3 0 24 NNE 1 1 5 9 2 0 18 NE 0 0 3 2 0 0 5 ENE 2 0 4 5 1 0 12 E 0 1 17 23 2 0 43 ESE 0 0 5 16 33 4 58 SE 0 1 3 12 1 1 18 SSE 0 2 2 13 12 22 51 S 0 1 15 25 28 31 100 SSW 1 4 14 48 32 4 103 SW 0 4 12 22 9 0 47 WSW 1 4 7 11 2 0 25 W 0 5 13 41 2 0 61 WNW 0 2 16 24 2 0 44 NW 0 2 19 41 6 0 68 NNW 1 2 12 20 1 0 36 Variable 0 0 0 0 0 0 0 Total 6 30 150 329 136 62 713 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 4 Hours of missing stability measurements in all stability classes: 0 178 of 206 Byron Generating Station Period of Record: October -December2008 Stability Class -Moderately Stable -250Ft-3OFt 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 3 1 0 5 NNE 0 1 5 5 0 0 11 NE 0 0 0 0 0 0 0 ENE 1 2 2 1 0 0 6 E 2 6 4 7 1 2 22 ESE 0 3 6 4 7 4 24 SE 1 1 2 9 7 0 20 SSE 0 0 3 4 1 1 9 S 0 0 4 9 33 7 53 SSW 0 1 2 5 1 0 9 SW 0 1 ,5 3 0 0 9 WSW 1 1 2 4 1 0 9 W 0 2 7 11 0 0 20 WNW 0 1 1 10 0 0 12 NW 0 0 8 8 0 0 16 NNW 0 2 1 3 0 0 6 Variable 0 0 0 0 0 0 0 Total 5 21 53 86 52 14 231 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 0 179 of 206 Byron Generating Station Period of Record: October -December2008 Stability Class -Extremely Stable -250Ft-3OFt 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 1 0 1 0 4 NNE 0. 1 3 0 0 0 4 NE 1 1 4 0 0 0 6 ENE 2 2 2 1 0 0 7 E 1 1 3 3 0 0 8 ESE 0 2 3 1 0 1 7 SE 0 0 1 2 6 0 9 SSE 0 0 0 7 4 0 11 S 1 1 1 2 8 0 13 SSW 0 0 3 0 0 0 3 SW 0 1 0 0 0 0 1 WSW 0 0 0 2 0 0 2 W 0 2 0 0 0 0 2 WNW 1 2 2 0 0 0 5 NW 0 3 1 0 0 0 4 NNW 0 2 1 0 0, 0 3 Variable 0 0 0 0 0 0 0 Total 6 20 25 18 19 1 89 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 0 180 of 206 APPENDIX G ANNUAL RADIOLOGICAL GROUNDWATER PROTECTION PROGRAM REPORT (ARGPPR)181 of 206 182 of 206 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 2008 Prepared By Teledyne Brown Engineering Environmental Services SM Nuclear Byron Nuclear Generating Station Byron, IL 61010 May 2009 183 of 206 This page is intentionally blank.184 of 206 Table Of Contents I. Sum m ary and Conclusions

.............................................................................................

1 II. Introduction

....... ....................................................

4 A. O bjectives of the RG PP ....................................................................................

4 B. Im plem entation of the O bjectives

....................................................................

4 C .Program Description

.........................................................................................

5 D. Characteristics of Tritium (H-3) ..........................................................................

6 I1l. Program Description

....................................................................................................

6 A. Sam ple Analysis ...............................................................................................

6 B. Data Interpretation

.............................................................................................

7 C .Background Analysis ........................................................................................

8 1. Background Concentrations of Tritium ..................................................

8 IV. Results and discussion

...............................................................................................

10 A. G roundw ater Results ...............................

.......................................................

10 B. Drinking Water Well Survey ....................................

11 C. Summary of Results -Inter-laboratory Comparison Program .......................

11 D. Leaks, Spills, and Releases ...........................................................................

11 E. Trends ..................................................................................................................

11 F. Investigations

....................................................................................................

11 G .Actions Taken ..................................................................................................

11 185 of 206 Appendices Appendix A Tables Table A-i: Location Designation Radiological Groundwater Protection Program -Sampling Locations, Distance and Direction, Byron Nuclear Generating Station, 2008 Figures Figure A-I: Appendix B Tables Table B-1.1 Table B-1.2 Monitoring Well Locations, Byron Nuclear Generating Station, 2008 (Extra wells noted on map are for reference only.)Data Tables Concentrations of Tritium and Strontium in Groundwater Samples Collected in the Vicinity of Byron Nuclear Generating Station, 2008.Concentrations of Gamma Emitters in Groundwater Samples Collected in the Vicinity of Byron Nuclear Generating Station, 2008.ii 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 on an Exelon web site http://www.exeloncorp.com/ourcompanies/powercqen/nuclear/Tritium.html.

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 third 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 2008.During that time period, 68 analyses were performed on 49 samples from 22 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.

Strontium-90 was not detected at a concentration greater than the LLD of 2.0 picoCuries per liter (pCi/L) in any of the groundwater samples tested in 2008.Tritium was not detected in any of the groundwater samples at concentrations greater than the United States Environmental Protection Agency (USEPA)drinking water standard (and the Nuclear Regulatory Commission Reporting Limit) of 20,000 pCi/L. Low levels of tritium were detected at concentrations greater than the LLD of 200 pCi/L in three of 22 groundwater sample locations.

The tritium concentrations in these three monitoring wells ranged from 207 +/- 118 pCi/L to 2,150 +/- 278 pCi/L. Two of these monitoring wells (AR-4 & AR-11) are located near Circ Water Blowdown vaults (3 & 4) along the blowdown line located west of the station. The third well (AR-7) is located west of U2 Containment.

This well was resampled after a positive result (207 pCi/L) with the results being<LLD. The initial result was suspected to be due to rainwater intrusion into the well borehole that has since been corrected.

Well AR-4 has shown an overall decrease in tritium concentration since first sampled in 2006. Well AR-1 1 has-1-187 of 206 been relatively unchanged from previous results. Wells AR-2 & AR-3 tritium concentrations decreased below the LLD value for the first time since sampling began in 2006.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.-2-188 of 206 Intentionally left blank-3-189 of 206 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 1280 and 1254 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 2008.A. Objectives of the RGPP The long-term objectives of the RGPP are as follows: 1. Identify suitable locations to monitor and evaluate potential impacts from station operations before significant radiological impact to the environment and potential drinking water sources.2. Understand the local hydrogeologic regime in the vicinity of the station and maintain up-to-date knowledge of flow patterns on the surface and shallow subsurface.

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

4. Report new leaks, spills, or other detections with potential radiological significance to stakeholders in a timely manner.5. Regularly assess analytical results to identify adverse trends.6. Take necessary corrective actions to protect groundwater resources.

B. Implementation of the Objectives The objectives identified have been implemented at Byron 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 on an Exelon web site in station specific reports.http://www.exeloncorp.com/ourcompanies/powergen/nuclear/Tritium.html-4-190 of 206

2. The Byron Nuclear Generating Station reports describe the local hydrogeologic regime. Periodically, the flow patterns on the surface and shallow subsurface are updated based on ongoing measurements.

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

.4. Byron Nuclear Generating Station has implemented new procedures to identify and report new leaks, spills, or other detections with potential radiological significance in a timely manner.5. Byron Nuclear Generating Station staff and consulting hydrogeologist assess analytical results on an ongoing basis to identify adverse trends.C. Program Description 1 .Sample Collection Sample locations can be found in Table A--1 and Figure A-I, 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. 191 of 206 D. Characteristics of Tritium (H-3)Tritium (chemical symbol H-3) is a radioactive isotope of hydrogen.

The most common form of tritium is tritium oxide, which is also called "tritiated water." The chemical properties of tritium are essentially those of ordinary hydrogen.Tritiated water behaves the same as ordinary water in both the environment and the body. Tritium can be taken into the body by drinking water, breathing air, eating food, or absorption through skin. Once tritium enters the body, it disperses quickly and is uniformly distributed throughout the body. Tritium is excreted primarily through urine with a clearance rate characterized by an effective biological half-life of about 14 days. Within one month or so after ingestion, essentially all tritium is cleared.Organically bound tritium (tritium that is incorporated in organic compounds) can remain in the body for a longer period.Tritium is produced naturally in the upper atmosphere when cosmic rays strike air molecules.

Tritium is also produced during nuclear weapons explosions, as a by-product in reactors producing electricity, and in special production reactors, where the isotopes lithium-7 and/or boron-1 0 are activated to produce tritium. Like normal water, tritiated water is colorless and odorless.

Tritiated water behaves chemically and physically like non-tritiated water in the subsurface, and therefore tritiated water will travel at the same velocity as the average groundwater velocity.Tritium has a half-life of approximately 12.3 years. It decays spontaneously to helium-3 (3He). This radioactive decay releases a beta particle (low-energy electron).

The radioactive decay of tritium is the source of the health risk from exposure to tritium. Tritium is one of the least dangerous radionuclides because it emits very weak radiation and leaves the body relatively quickly. Since tritium is almost always found as water, it goes directly into soft tissues and organs. The associated dose to these tissues is generally uniform and is dependent on the water content of the specific tissue.Ill. Program Description A. Sample Analysis This section describes the general analytical methodologies used by TBE to analyze the environmental samples for radioactivity for the Byron Nuclear Generating Station RGPP in 2008.-6-192 of 206 In order to achieve the stated objectives, the current program includes the following analyses: 1. Concentrations of gamma emitters in groundwater (as required by procedure).

2. Concentrations of strontium in groundwater (as required by procedure).

3. Concentrations of tritium 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: 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-7-193 of 206 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.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-8-194 of 206 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 USEPA's 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 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-9-195 of 206 100 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.Tritium Samples from all locations were analyzed for tritium activity (Table B-1.1, Appendix B). Tritium values ranged from less than the detection limit to 2,150 pCi/I. Within the station boundary, concentrations of tritium at the bottom of the Galena-Platteville aquifer ranged from 207-2150 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. Of the twenty-two wells sampled in 2008, three contained levels of tritium above the lower limit of detection (LLD) of 200 pCi/L. They were: AR-4 (2150 and 1910 pCi/L), AR-11 (1220 & 1280 pCi/L), and AR-7 (207 pCi/L). Well AR-7 was resampled after the initial positive result and found to be <LLD. The suspected cause of the initial result was rainwater intrusion into the well borehole that has since seen corrected.

Well AR-4 has shown an overall decrease in tritium concentration since first sampled in 2006. Well AR-i 1 has been relatively unchanged from previous results. 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.-10-196 of 206 Strontium Strontium-90 was not detected in the any of the samples tested in 2008.Gamma Emitters Gamma-emitting radionuclides associated with licensed plant operations were not detected at concentrations greater than their respective Lower Limits of Detection (LLDs) in any of the samples during 2008.B. Drinking Water Well Survey No drinking water well surveys were conducted in 2008.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 have been no new leaks, spills or releases at Byron Station in 2008.E. Trends Well AR-4 has shown an overall decrease in tritium concentration since first sampled in 2006. In 2008, Wells AR-2 & AR-3 tritium concentrations decreased below the LLD value for the first time since sampling began in 2006.F. Investigations No investigations were initiated in 2008 due to anomalous sample results.G. Actions Taken 1. Compensatory Actions No compensatory actions were initiated in 2008.2. Installation of Monitoring Wells No new monitoring wells were installed in 2008.-11 -197 of 206

3. Actions to Recover/Reverse Plumes No actions were undertaken to recover/reverse plumes in 2008.-12-198 of 206 APPENDIX A LOCATION DESIGNATION 199 of 206 200 of 206 TABLE A-1: Radiological Groundwater Protection Program -Sampling Locations, Distance and Direction, Byron Nuclear Generating Station, 2008 Site Site Type Temporary/Permanent AR-1 AR-10 AR-11 AR-2 AR-3 AR-4 AR-5 AR-6 AR-7 AR-8 AR-9 CAR-1 CAR-2 CAR-3 DF-24 (EPA well)GW-9 MW-1 (EPA well)MW-3 (EPA well)TW-13 TW-14 TW-15 Well 7 Monitoring Well Monitoring Well Monitoring Well Monitoring Well Monitoring Well Monitoring Well Monitoring Well Monitoring Well Monitoring Well Monitoring Well Monitoring Well Monitoring Well Monitoring Well Monitoring Well Monitoring Well Monitoring Well Monitoring Well Monitoring Well Monitoring Well Monitoring Well Monitoring Well Monitoring Well Permanent Permanent Permanent Permanent Permanent Permanent Permanent Permanent Permanent Permanent Permanent Permanent Permanent Permanent Permanent Permanent Permanent Permanent Permanent Permanent Permanent Permanent Distance and Direction 0.36 miles/NNW 0.28 miles/NE 1.36 miles/WNW 0.6 miles/NW 0.8 miles/NW 1.36 miles/WNW 1.92 miles/WNW 2.04 miles/WNW 0.04 miles/W 0.12 miles/S 0.24 miles/E 2.25 miles/WNW 1.52 miles/WNW 0.16 miles/SE 1.36 miles/WNW 0.9 miles/WNW 0.6 miles/NW 0.8 miles/NW 2.3 miles/WNW 2.25 miles/WNW 2.2 miles/WNW 0.4 miles/SE 201 of 206 OFigure A-1 Monitoring Well Locations, Byron Nuclear Generating Station, 2008 APPENDIX B DATA TABLES 203 of 206 204 of 206 TABLE B-I.1 CONCENTRATIONS OF TRITIUM AND STRONTIUM IN GROUNDWATER SAMPLES COLLECTED IN THE VICINITY OF BYRON NUCLEAR GENERATION STATION, 2008 RESULTS IN UNITS OF PCI/LITER

+/- 2 SIGMA COLLECTION SITE PERIOD H-3 SR-90 AR-1 06/02/08 < 187 AR-1 09/30/08 < 163 < 1.5 AR-10 06/02/08 189 +/- 117 AR-10 09/30/08 < 160 < 0.7 AR-11 05/28/08 1220 +/- 187 AR-11 10/01/08 1280 +/- 189 < 1.4 AR-2 05/29/08 < 186 AR-2 10/01/08 < 169 < 0.7 AR-3 01/08/08 757 +/- 154 AR-3 02/12/08 390 +/- 118 AR-3 03/18/08 413 +/- 119 AR-3 05/29/08 < 186 AR-3 10/01/08 < 163 < 0.4 AR-4 05/28/08 2150 +/- 278 AR-4 05/28/08 1890 +/- 264 AR-4 10/01/08 1910 +/- 250 < 0.6 AR-5 05/28/08 < 184 AR-5 10/01/08 < 166 < 0.6 AR-6 05/28/08 < 188 AR-6 10/01/08 < 171 < 0.5 AR-7 06/02/08 207 +/- 118 AR-7 06/02/08 228 +/- 121 AR-7 06/30/08 < 169 AR-7 09/30/08 < 161 < 0.8 AR-8 06/02/08 < 185 AR-8 09/30/08 < 169 < 0.8 AR-9 06/02/08 < 189 AR-9 09/30/08 < 164 < 0.9 CAR-1 05/28/08 < 187 CAR-1 10/01/08 < 166 < 0.6 CAR-2 05/28/08 < 191 CAR-2 10/01/08 < 158 < 0.8 CAR-3 06/02/08 < 185 CAR-3 09/30/08 < 167 < 0.8 DF-24 05/28/08 < 188 DF-24 10/01/08 < 167 GW-9 05/29/08 < 181 GW-9 10/02/08 < 163 < 0.4 MW-1 05/29/08 < 186 MW-1 10/01/08 < 172 MW-3 05/29/08 < 186 MW-3 10/01/08 (1)TW-13 05/28/08 < 188 TW-13 10/02/08 < 164 < 1.2 TW-14 05/28/08 < 186 TW-14 10/02/08 < 168 < 0.4 TW-15 05/28/08 < 186 TW-15 10/02/08 < 164 < 0.2 WELL 7 05/29/08 < 186 WELL 7 10/02/08 < 150 < 0.9 (1) No sample was collected due to the well being dry.205 of 206 TABLE B-I.2 CONCENTRATIONS OF GAMMA EMITTERS IN GROUNDWATER SAMPLES COLLECTED IN THE VICINITY OF BYRON NUCLEAR GENERATION STATION, 2008 RESULTS IN UNITS OF PCI/LITER

+/- 2 SIGMA STC COLLECTION Be-7 K-40 Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 Cs-134 Cs-137 Ba-140 La-140 PERIOD AR-1 09/30/08 AR-10 09/30/08 AR-11 10/01/08 AR-2 10/01/08 AR-3 10/01/08 AR-4 10/01/08 AR-5 10/01/08 AR-6 10/01/08 AR-7 09/30/08 AR-8 09/30/08 AR-9 09/30/08 CAR-1 10/01/08 CAR-2 10/01/08 CAR-3 09/30/08 GW-9 10/02/08 TW-13 10/02/08 TW-14 10/02/08 TW-15 10/02/08 WELL 7 10/02/08< 30 < 51 < 2<27 <19 <2< 23 < 48 < 2< 26 < 45 < 2< 22 < 35 < 2<25 <19 <2<27 89 +/-44 <2< 20 64 +/- 33 < 2<32 71 +/-37 <3< 24 < 17 <2<22 <16 <2< 16 < 11 < 1< 32 < 27 < 3 21 < 15 < 2<25 < 17 < 2< 28 98 +/- 36 < 2<25 <17 <2< 19 48 +/-26 <2< 31 < 49 < 2<2<3<2<3<3<3<3<2<3<2<2<2<3<2<2<3<2<2<3=<6<6<6<7<6<7<7<5<8<6<6<4<7<6<5<6<6<4<7<2<2<2<2<3<2<2<2<2<2<2<1<3<2<2<2<2<2<3<5<5<4<5<4<5<5<3<6<4<4<3<6<3<4<5<4<3<5<3<3<3<3<3<3<3<2<4<3<3<2<4<2<2<3<3<2<4<5<5<4<5<5<5<5<4<6<4<4<3<6<4<4<5<5<3<6<2<2<2<2<2<2<2<2<2<2<3<2<2<2<2 <2<3 <3<2 <2<2 <2<1 <1<3 <3<2 <2<2 <2<2 <2<2 <2<2 <2<3 <3< 45< 45< 38< 39< 33< 39< 39< 36< 47* 40< 38< 24< 45< 37< 34< 40< 33< 26< 47< 14< 15< 13< 11<12< 11*<15*<12*<13<12< 13<7< 14< 13< 11< 11< 11<8< 14 FO