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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)
	v • d • e

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 ........................................................................................... 1 II. Introduction ........................................................................................................................ 3 A. O bjectives of the REM P .................................................................................. 3 B. Implem entation of the O bjectives .................................................................... .3 II1. Program Description ............................................ 3 A. Sam ple Collection ............................................................................................. 3 B. Sam ple Analysis ................................................................................................ 6 C . Data Interpretation ........................................................................................... 6 D. Program Exceptions ........................................................................................ 7 E. Program Changes ......................................................................................... 11 IV. Results and Discussion ............................................................................................. 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 ............................................................... ................... 13

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

a. Air Particulates .......................................................................... 13

b. Airborne Iodine .............................. ......... 14

2. Terrestrial .............................................. 14

a. Milk ................................................................ 14

b. Vegetation ........................................ 14 C . Am bient G am m a Radiation ............................................................................ 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 Radiological Environmental Monitoring Program Summary for Byron Nuclear Generating Station, 2008 Appendix B Location Designation, Distance & Direction, and Sample Collection &

Analytical Methods Tables Table B-1: Radiological Environmental Monitoring Program - Sampling Locations, Distance and Direction, Byron Nuclear Generating Station, 2008 Table B-2: Radiological Environmental Monitoring Program - Summary of Sample Collection and Analytical Methods, Byron Nuclear Generating Station, 2008 Figqures Figure B-I: Inner and Outer Ring TLD Locations of the Byron Nuclear Generating Station, 2008 Figure B-2: Onsite Air Sampling Locations of the Byron Nuclear Generating Station, 2008 Figure B-3: Offsite Air Sampling Locations of the Byron Nuclear Generating Station, 2008 Figure B-4: Ingestion and Waterborne Exposure Pathway Sampling Locations of the Byron Nuclear Generating Station, 2008 Appendix C Data Tables and Figures - Primary Laboratory Tables Table C-1.1 Concentrations of Gross Beta in Surface Water Samples Collected in the Vicinity of Byron Nuclear Generating Station, 2008.

Table C-1.2 Concentrations of Tritium in Surface Water Samples Collected in the Vicinity of Byron Nuclear Generating Station, 2008.

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Table C-1.3 Concentrations of Gamma Emitters in Surface Water Samples Collected in the Vicinity of Byron Nuclear Generating Station, 2008.

Table C-11.1 Concentrations of Tritium in Ground Water Samples Collected in the Vicinity of Byron Nuclear Generating Station, 2008.

Table C-11.2 Concentrations of Gamma Emitters in Ground Water Samples Collected in the Vicinity of Byron Nuclear Generating Station, 2008.

Table C-111.1 Concentrations of Gamma Emitters in Fish Samples Collected in the Vicinity of Byron Nuclear Generating Station, 2008.

Table C-IV.1 Concentrations of Gamma Emitters in Sediment Samples Collected in the Vicinity of Byron Nuclear Generating Station, 2008.

Table C-V.1 Concentrations of Gross Beta in Air Particulate Samples Collected in the Vicinity of Byron Nuclear Generating Station, 2008.

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.

Table C-V.3 Concentrations of Gamma Emitters in Air Particulate Samples Collected in the Vicinity of Byron Nuclear Generating Station, 2008.

Table C-VI.1 Concentrations of 1-131 in Air Iodine Samples Collected in the Vicinity of Byron Nuclear Generating Station, 2008.

Table C-VII.1 Concentrations of 1-131 in Milk Samples Collected in the Vicinity of Byron Nuclear Generating Station, 2008.

Table C-VII.2 Concentrations of Gamma Emitters in Milk Samples Collected in the Vicinity of Byron Nuclear Generating Station, 2008.

Table C-VIII.1 Concentrations of Gamma Emitters in Vegetation Samples Collected in the Vicinity of Byron Nuclear Generating Station, 2008.

Table C-IX.1 Quarterly TLD Results for Byron Nuclear Generating Station, 2008.

Table C-IX.2 Mean Quarterly TLD Results for the Inner Ring, Outer Ring, Other and Control Locations for Byron Nuclear Generating Station, 2008.

Table C-IX.3 Summary of the Ambient Dosimetry Program for Byron Nuclear Generating Station, 2008.

Fi-gures Figure C-1 Surface Water - Gross Beta - Stations BY-12 and BY-29 (C) Collected in the Vicinity of BNGS, 2000 - 2008.

Figure C-2 Surface Water - Tritium - Stations BY-12 and BY-29 (C) Collected in the Vicinity of BNGS, 2000 - 2008.

Figure C-3 Ground Water - Tritium - Stations BY-14-1 and BY-18 Collected in the Vicinity of BNGS, 2000 - 2008.

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Figure C-4 Ground Water - Tritium - Station BY-32 Collected in the Vicinity of BNGS, 2000 - 2008.

Figure C-5 Ground Water - Tritium - Station BY-35 and BY-36 Collected in the Vicinity of BNGS, 2006 - 2008.

Figure C-6 Ground Water - Tritium - Station BY-37 Collected in the Vicinity of BNGS, 2006 - 2008.

Figure C-7 Air Particulate - Gross Beta - Stations BY-08 (C) and BY-21 Collected in the Vicinity of BNGS, 2000 - 2008.

Figure C-8 Air Particulate - Gross Beta - Stations BY-22 and BY-23 Collected in the Vicinity of BNGS, 2000 - 2008.

Figure C-9 Air Particulate - Gross Beta - Station BY-24 Collected in the Vicinity of BNGS, 2000 - 2008.

Figure C-10 Air Particulate - Gross Beta - Station BY-01 and BY-04 Collected in the Vicinity of BNGS, 2005 - 2008.

Figure C-1 1 Air Particulate - Gross Beta - Station BY-06 Collected in the Vicinity of BNGS, 2005 - 2008.

Appendix D Inter-Laboratory Comparison Program Tables Table D-1 Analytics Environmental Radioactivity Cross Check Program Teledyne Brown Engineering, 2008 Table D-2 ERA Environmental Radioactivity Cross Check Program Teledyne Brown Engineering, 2008 Table D-3 DOE's Mixed Analyte Performance Evaluation Program (MAPEP)

Teledyne Brown Engineering, 2008 Appendix E Effluent Report Appendix E-1 Data Tables and Figures iv 6 of 206

Appendix F Meteorological Data Appendix G 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.

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Intentionally left blank 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 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.

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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 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.

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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 14 of 206

Table D-1 LISTING OF SAMPLE ANOMALIES (cont'd)

Sample Sample Location Collection Reason Type Code Date A/I BY-24 06/03/08 Run time meter low due to power outage from storms BY-1 02-1 TLD 06/03/08 Poles holding TLDs blown over from storms; BY- 102-2 TLDs were reattached to replacement poles TLD BY-1 05-1 07/01/08 Could not differentiate results between BY-105-1 & BY-212-4 TLD BY-212-4 07/01/08 Could not differentiate results between BY-105-1 & BY-212-4 A/I BY-04 08/05/08 No power due to storm A/I BY-22 08/05/08 No power due to storm A/I BY-23 08/05/08 No power due to storm A/I BY-24 08/05/08 No power due to storm TLD BY- 108-2 08/05/08 TLD knocked off pole from falling tree; reattached A/I BY-01 08/05/08 Low timer reading due power outage from storm; estimated time A/I BY-04 08/05/08 Low timer reading due power outage from storm; estimated time A/I BY-06 08/05/08 Low timer reading due power outage from storm; estimated time A/I BY-08 08/05/08 Low timer reading due power outage from storm; estimated time A/I BY-21 08/05/08 Low timer reading due power outage from storm; estimated time A/I BY-22 08/05/08 Low timer reading due power outage from storm; estimated time A/I BY-23 08/05/08 Low timer reading due power outage from storm; estimated time A/I BY-24 08/05/08 Low timer reading due power outage from storm; estimated time 8

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Table D-1 LISTING OF SAMPLE ANOMALIES (cont'd)

Sample Location Collection Reason Type Code Date A/I BY-04 08/12/08 Low timer reading due power outage from storm; estimated time A/I BY-22 08/12/08 Low timer reading due power outage from storm; estimated time A/I BY-23 08/12/08 Low timer reading due power outage from storm; estimated time Low timer reading due power outage from A/I BY-24 08/12/08 storm; estimated time A/I BY-01 09/09/08 Vacuum gauge broken; replaced & checked V QUAD-3 09/09/08 Vegetation sample recollected due to measurement change; original QUAD 3 sample location found to be in QUAD 4 A/I BY-01 09/30/08 Vacuum gauge broken; replaced & checked A/I BY-24 10/14/08 Vacuum gauge broken; replaced & checked Table D-2 LISTING OF MISSED SAMPLES Sample Locatio Sample Locatiorn Collection Reason Type Code Date SW BY-12 01/02/08 No sample; ice on river SW BY-29 01/02/08 No sample; ice on river M BY-38 01/08/08 No sample; goats not pro ducing until spring SW BY-12 01/22/08 No sample; ice on river SW BY-29 01/22/08 No sample; ice on river SW BY-29 01/29/08 No sample; ice on river M BY-38 02/05/08 No sample; goats not pro ducing until spring M BY-30 02/05/08 No sample; farmer sold rrnilk cows SW BY-29 02/05/08 No sample; ice on river 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.

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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).

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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, 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).

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

b. Airborne Iodine Continuous air samples were collected from eight locations (BY-01, BY-04, BY-06, BY-08, BY-21, BY-22, BY-23, and BY-24) and analyzed weekly for 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:

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

C. Ambient Gamma Radiation Ambient gamma radiation levels were measured utilizing 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 ft2 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.

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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 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%). Ifthe 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 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 GR-B 23 4 5.2 4.9 5.2 BY- 12 INDICATOR 0 (PCI/LITER) (12/12) (10/11) (12/12) OREGON POOL OF ROCK RIVER - DOWNSTREAM (3.5/6.4) (3.3/5.7) (3.5/6.4) 4.5 MILES SSW OF SITE H-3 8 200 <LLD <LLD GAMMA 23 MN-54 15 <LLD. <LLD 0 CO-58 15 <LLD <LLD 0 FE-59 30 <LLD <LLD 0 0I CO-60 15 <LLD <LLD 0.,

O

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 ZN-65 23 30 <LLD <LLD 0 (PCI/LITER)

NB-95 15 <LLD <LLD 0 ZR-95 30 <LLD <LLD 1-131 15 <LLD <LLD CS-134 15 <LLD <LLD CS-137 18 <LLD <LLD 0'0 O

BA-140 60 <LLD <LLD 0

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

TABLE A-1 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANNUAL

SUMMARY

FOR BYRON NUCLEAR GENERATION STATION, 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 LA-140 23 15 <LLD <LLD (PCI/LITER)

GROUND WATER H-3 24 200 <LLD NA (PCI/LITER)

GAMMA 24 MN-54 15 <LLD NA 0 CO-58 15 <LLD NA 0 FE-59 30 <LLD NA 0 t'J CO-60 15 <LLD NA 0

t0

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 ZN-65 24 30 <LLD NA 0 (PCI/LITER)

NB-95 15 <LLD NA 0 ZR-95 30 <LLD NA 1-131 15 <LLD NA 0 CS-134 15 <LLD NA 0 CS-137 18 <LLD NA 0 0

I'-.

BA- 140 60 <LLD NA 0

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

TABLE A-1 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANNUAL

SUMMARY

FOR BYRON NUCLEAR GENERATION STATION, 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 LA-140 24 15 <LLD NA 0 (PCI/LITER)

FISH GAMMA 8 (PCI/KG WET) MN-54 130 <LLD <LLD 0 CO-58 130 <LLD <LLD 0 FE-59 260 <LLD <LLD 0 CO-60 130 <LLD <LLD 0 ZN-65 260 <LLD <LLD 0

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 NB-95 8 NA <LLD <LLD 0 (PCI/KG WET)

ZR-95 NA <LLD <LLD 0 CS-134 130 <LLD <LLD 0 CS-137 150 <LLD <LLD 0 BA-140 NA <LLD <LLD 0 LA- 140 NA <LLD <LLD 0 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 GAMMA 4 (PCI/KG DRY) MN-54 NA <LLD NA 0 CO-58 NA <LLD NA 0 FE-59 NA <LLD NA 0 CO-60 NA <LLD NA 0 ZN-65 NA <LLD NA 0 NB-95 NA <LLD NA 0 0

-b

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 ZR-95 4 NA <LLD NA 0 (PCIiKG DRY)

CS-134 150 <LLD NA 0 CS-137 180 158 NA 190 BY-12 INDICATOR 0 (3/4) (2/2) OREGON POOL OF ROCK RIVER - DOWNSTREAM (60/320) (60/320) 4.5 MILES SSW OF SITE BA-140 NA <LLD NA LA-140 NA <LLD NA 0 AIR PARTICULATE GR-B 416 10 20 20 21 BY-06 INDICATOR (E-3 PCI/CU.METER) (364/364) (52/52) (52/52) OREGON (5/42) (8/37) (7/42) 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 GAMMA 32 (E-3 PCI/CU.METER) MN-54 NA <LLD <LLD 0 CO-58 NA <LLD <LLD 0 FE-59 NA <LLD <LLD 0 CO-60 NA <LLD <LLD 0 ZN-65 NA <LLD <LLD 0 NB-95 NA <ILD <LLD 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 ZR-95 32 NA <LLD <LLD 0 (E-3 PCI/CU.METER)

CS-134 50 <LLD <LLD 0 CS-137 60 <LLD <LLD 0 BA-140 NA <LLD <LLD 0 LA- 140 NA <LLD <LLD 0 AIR IODINE GAMMA 416 (E-3 PCI/CU.METER) 1-131 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 1-131 55 <LLD <LLD 0 (PCI/LITER)

GAMMA 55 MN-54 NA <LLD <LLD 0 CO-58 NA <LLD <LLD FE-59 NA <LLD <LLD CO-60 NA <LLD <LLD 0 ZN-65 NA <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 NB-95 55 NA <LLD <LLD 0 (PCI/LITER)

ZR-95 NA <LLD <LLD 0 CS-134 15 <LLD <LLD CS-137 18 <LLD <LLD BA-140 60 <LLD <LLD 0 LA- 140 15 <LLD <LLD 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 GAMMA 10 (PCI/KG WET) MN-54 NA <LLD <LLD CO-58 NA <LLD <LLD 0 FE-59 NA <LLD <LLD 0 CO-60 NA <LLD <LLD 0 ZN-65 NA <LLD <LLD 0 NB-95 NA <LLD <LLD 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 ZR-95 10 NA <LLD <LLD 0 (PCI/KG WET) 1-131 60 <LLD <LLD 0 CS-134 60 <LLD <LLD 0 CS-137 80 <LLD <LLD 0 BA-140 NA <LLD <LLD 0 LA-140 NA <LLD <LLD 0 O

0o DIRECT RADIATION TLD-QUARTERLY 342 NA 22.9 19.4 26.7 BY-105-1 INDICATOR 0 (MILLI-ROENTGEN/QTR.) (334/334) (8/8) (3/3)

(16/30) (17/21) (24/29) 1.4 MILES E

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

APPENDIX B LOCATION DESIGNATION, DISTANCE & DIRECTION, AND SAMPLE COLLECTION & ANALYTICAL METHODS 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 Oregon Pool of Rock River, Downstream 4.5 miles SSW BY-29 Byron, Upstream (control) 3.0 miles N B. Ground/Well Water BY-14-1 3200 North German Church Road 1.0 miles SSE BY-18 McCoy Farmstead 0.7 miles SW BY-32 Ron Wolford Well 1.8 miles W BY-35 Vancko Well 2.0 miles WNW BY-36 Blanchard Well 1.0 miles NW BY-37 Alexander Well 1.8 miles WNW C. Milk BY-20-1 Ron Snodgrass Farm 4.7 miles WSW BY-26-1 Dennis Herbert (control) 12.8 miles N BY-30 Don Roos Dairy 5.3 miles SE BY-30-1 Ebert Farm 5.0 miles NNW BY-38 Larson Goat Farm 5.0 miles ENE D. Air Particulates / Air Iodine BY-01 Byron 3.0 miles N BY-04 Paynes Point 5.0 miles SE BY-06 Oregon 4.7 miles SSW BY-08 Leaf River (control) 6.8 miles WNW BY-21 Byron Nearsite North 0.3 miles N BY-22 Byron Nearsite East-Southeast 0.4 miles ESE BY-23 Byron Nearsite South 0.6 miles S BY-24 Byron Nearsite Southwest 0.6 miles SW E. Fish BY-29 Byron, Upstream (control) 3.0 miles N BY-31 Byron, Discharge 2.2 miles WNW F. Sediment BY-12 Oregon Pool of Rock River, Downstream 4.5 miles SSW BY-34 Rock River, Downstream 0.6 miles W G. Vegetation Quadrant 1 5186 N. Cox Road, Stillman Valley 4.9 miles ENE Quadrant 2 6402 Brick Road, Oregon 4.9 miles SE Quadrant 3 555 Park Road, Oregon 3.4 miles SW Quadrant 4 Met Tower, Byron 0.6 miles SW Control 8631 11th Street, Davis Junction 6.8 miles ENE H. Environmental Dosimetry - TLD Inner Ring BY-101-1 and-2 0.3 miles N BY-102-1 0.9 miles NNE BY- 102-2 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 1.7 miles NE BY-103-3 0.43 miles NE BY-104-1 and -2 1.5 miles ENE BY-104-3 0.36 miles ENE BY-1 05-1 and -2 1.3 miles E BY-106-1 and -2 1.4 miles ESE BY-107-1 and -2 1.4 miles SE BY- 107-3 0.47 miles SE BY-108-1 0.7 miles SSE BY-108-2 0.6 miles SSE BY-109-1 and -2 0.6 miles S BY-110-1 and -2 0.6 miles SSW BY-111-3 0.7 miles SW BY-111-4 0.8 miles SW BY-1 12-3 and -4 0.8 miles WSW BY-113-1 and -2 0.7 miles W BY-1 14-1 and -2 0.8 miles WNW BY-1 15-1 and -2 1.0 miles NW BY-116-1 and -2 1.4 miles NNW BY-116-3 0.85 miles NNW Outer Ring BY-201-3 4.5 miles N BY-201-4 4.4 miles N BY-202-1 4.3 miles NNE BY-202-2 4.8 miles NNE BY-203-1 4.8 miles NE BY-203-2 4.7 miles NE BY-204-1 4.2 miles ENE BY-204-2 4.1 miles ENE BY-205-1 and -2 3.8 miles E BY-206-1 4.1 miles ESE BY-206-2 4.4 miles ESE BY-207-1 4.2 miles SE BY-207-2 3.6 miles SE BY-208-1 4.0 miles SSE BY-208-2 3.7 miles SSE BY-209-1 and -4 3.7 miles S BY-210-3 and -4 3.9 miles SSW BY-211-1 and -4 4.9 miles SW BY-212-1 and -4 4.7 miles WSW BY-213-1 4.7 miles W BY-213-4 4.6 miles W BY-214-1 4.6 miles WNW BY-214-4 4.9 miles WNW BY-215-1 5.3 miles NW BY-215-4 5.2 miles NW BY-216-1 4.6 miles NNW BY-216-2 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 0.2 miles N BY-302-1 0.2 miles N BY-314-1 0.2 miles WNW Other BY-01-1 and -2 3.0 miles N BY-04-1 and -2 5.0 miles SE BY-06-1 and -2 4.7 miles SSW BY-21-1 and-2 0.3 miles N BY-22-1 and -2 0.4 miles ESE BY-23-1 and -2 0.6 miles S BY-24-1 and -2 0.6 miles SW Control BY-08-1 and -2 6.8 miles WNW 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

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RMI1PL*.1 L.TON Figure B-2 Onsite Air Sampling Locations of the Byron Nuclear Generating Station, 2008 B-8 48 of 206

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& 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

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+ WAlER Figure B-4 Ingestion and Waterborne Exposure Pathway Sampling of the Byron Nuclear Generating Locations 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 BY-12 BY-29 PERIOD 01/08/08 - 01/15/08 5.9 +/- 1.9 4.7 +/- 1.8 02/05/08 - 02/05/08 3.5 +/- 2.1 (1) 03/11/08 - 03/24/08 6.2 +/- 2.6 5.3. +/- 2.6 04/01/08 - 04/29/08 5.3 +/- 1.9 5.7 +/- 2.0 05/06/08 - 05/27/08 5.9 +/- 2.9 5.4 +/- 2.9 06/03/08 - 06/24/08 5.9 +/- 2.1 5.4 +/- 2.1 07/01/08 - 07/28/08 4.3 +/- 2.1 5.2 +/- 2.2 08/05/08 - 08/26/08 4.9 +/- 2.6 < 3.7 09/02/08 - 09/30/08 4.9 +/- 2.0 4.3 +/- 2.0 10/07/08 10/28/08 5.3 +/- 2.2 4.7 +/- 2.2 11/04/08 - 11/25/08 3.7 +/- 2.0 4.8 +/- 2.1 12/02/08 - 12/02/08 6.4 +/- 2.1 3.3 +/- 1.9 MEAN 5.2 +/- 1.9 4.9 +/- 1.4 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 BY-12 BY-29 PERIOD 01/08/08 - 03/24/08

169 < 169 04/01/08 - 06/24/08

195 < 190 07/01/08 - 09/30/08 < 143 < 135 10/07/08 - 12/30/08 < 178 < 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 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-12 01/08/08 - 01/29/08 <1 <2 <4 <1 <3 <2 <3 < 12 <1 <1 < 18 <6 02/05/08 - 02/05/08 <2 <2 <4 <2 <3 <2 <4 < 14 <2 <2 < 21 <7 03/03/08 - 03/24/08 <3 <3 <5 <2 <5 <3 <6 < 13 <2 <3 < 25 <8 04/01/08 - 04/29/08 <2 <2 <4 <2 <3 <2 <3 < 11 <2 <2 < 18 <6 05/06/08 - 05/27/08 <2 <2 <5 <2 <4 <2 <4 <8 <1 <2 < 16 <5 06/03/08 - 06/24/08 <2 <2 <6 <2 <5 <3 <4 < 15 <2 <2 < 27 <9 07/01/08 - 07/28/08 <2 <2 <5 <2 <4 <2 <4 < 12 <2 <2 < 21 <7 08/05/08 - 08/26/08 <2 <2 <4 <2 <3 <2 <3 < 14 <2 <2 < 22 <7 09/02/08 - 09/30/08 <1 <1 <3 <1 <2 <1 <2 < 11 <1 <1 < 16 <5 10/07/08 - 10/28/08 <2 <2 <5 <1 <3 <2 <4 <9 <2 <2 < 46 < 12 11/04/08 - 11/25/08 <1 <1 <3 <1 <2 <1 <3 <8 <1 <1 < 54 < 13 12/02/08 - 12/30/08 <1 <1 <3 <1 <2 <1 <2 < 11 <1 <1 < 17 <5 MEAN BY-29 01/08/08 - 01/15/08 <1 <1 <3 <1 <2 <1 <2 <14 <1 <1 < 18 02/05/08 - 02/05/08 (1) 03/11/08 - 03/24/08 <4 <4 <9 <5 <8 <4 <8 < 14 <3 <4 < 31 < 10 04/01/08 - 04/29/08 <2 <2 <5 <2 <4 <2 <4 < 12 <2 <2 < 21 <6 05/06/08 - 05/27/08 <2 <2 <4 <2 <4 <2 <3 <9 <2 <2 < 16 <5 06/03/08 - 06/24/08 <2 <2 <5 <2 <4 <3 <4 < 15 <2 <2 < 24 <7 07/01/08 - 07/28/08 <2 <2 <4 <2 <4 <2 <4 < 13 <2 <2 < 21 <6 08/05/08 - 08/26/08 <2 <2 <4 <2 <3 <2 <3 < 14 <1 <2 < 21 <6 09/02/08 - 09/30/08 <1 <1 <3 <1 <3 <1 <3 < 12 <1 <1 < 18 <5 10/07/08 - 10/28/08 <2 <2 <6 <2 <3 <2 <4 <8 <1 <2 < 45 < 14 11/04/08 - 11/25/08 <1 <1 <3 <1 <2 <1 <2 <8 <1 <1 < 49 < 13 12/02/08 - 12/02/08 <0 <0 <1 <1 <1 <1 <1 < 14 <0 <0 < 13 <4 MEAN ON (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 BY-18 BY-32 BY-35 BY-36 BY-37 PERIOD 01/08/08 - 01/08/08 < 187 < 190 < 190 < 192 < 196 < 194 04/08/08 - 04/08/08 < 171 < 170 < 169 < 171 < 169 < 171 07/08/08 - 07/08/08 < 171 < 168 < 169

166 < 167 < 165 10/14/08 - 10/14/08 < 146

146

138 < 139

148

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 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-14-1 01/08/08 - 01/08/08 6 8 13 3 13 7 11 10 5 5 29 11 04/08/08 - 04/08/08 4 4 7 3 7 4 7 5 3 4 16 5 07108108 - 07/08/08 4 4 9 4 7 4 8 13 4 4 29 9 10/14/08 - 10/14/08 2 3 7 2 5 3 5 15 3 3 23 8 MEAN BY-18 01/08/08 - 01/08/08 6 6 10 7 10 6 7 10 5 5 23 12 04/08/08 - 04/08/08 5 5 11 5 9 5 10 9 5 6 26 8 C.) 07/08/08 - 07/08/08 4 5 9 4 7 5 8 14 4 5 34 9 10/14/08 - 10/14/08 2 2 5 2 5 2 4 14 2 2 21 8 MEAN BY-32 01/08/08 - 01/08/08 5 6 15 6 14 7 11 12 5 7 31 8 04/08/08 - 04/08/08 5 5 9 6 8 5 9 8 4 5 19 7 07/08/08 - 07/08/08 4 5 9 4 9 4 8 15 4 4 32 12 10/14/08 - 10/14/08 2 3 6 2 4 3 5 15 2 2 25 7 MEAN BY-35 01/08/08 - 01/08/08 6 6 13 7 12 7 10 11 5 7 32 9 04/08/08 - 04/08/08 4 4 8 4 8 4 7 8 4 4 20 7 07/08/08 - 07/08/08 3 4 9 4 7 4 7 14 4 4 30 10 10/14/08 10/14/08 2 2 5 2 4 2 4 12 2 2 21 7 MEAN 0*

0 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 - 01/08/08 < 5 < 4 <10 <5 < 8 < 5 < 8ý < 10 < 4 < 5 < 24 < 8 04/08/08 - 04/08/08 < 4 < 5 <9 <4 < 9 < 5 < 9 < 9 < 5 < 5 < 23 < 6 07/08/08 - 07/08/08 < 4 < 4 < 8 < 3 < 7 < 4 < 7 < 13 < 4 < 4 < 27 < 9 10/14/08 - 10/14/08 < 2 < 2 < 5 < 2 < 4 < 2 < 4

12 < 2 < 2 < 22 < 6 MEAN BY-37 01/08/08 - 01/08/08 < 7 < 5 <14 <6 <10 <7 < 12 < 13 < 6 < 7 < 35 < 13 04/08/08 - 04/08/08 < 4 < 4 <8 <4 <9 <4 < 6 < 7 < 4 < 3

21 < 5 07/08/08 - 07/08/08 < 3 < 3 < 8 < 3 <7 <4 < 7 < 12 < 3 < 4 < 26 < 10 10/14/08 - 10/14/08 < 1 < 1 < 3 < 1 <2 <1 < 2 <11 < 1 < 1 < 15 < 5 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 Mn-54 Co-58 Fe-59 Co-60 . Zn-65 Nb-95 Zr-95 Cs-134 Cs-137 Ba-140 La-140 PERIOD BY-29 Freshwater Drum 05/20/08 < 53 < 65 < 170 < 41 < 113 75 < 124 < 45 < 44 < 1510

372 Silver Redhorse 05/20/08 < 44 < 47

125 < 45 < 88 57 < 98 < 39 < 39 < 1240 < 373 River Carpsucker 10/21/08

50 < 48

148 < 39 < 106 57 < 105 <41 < 50 < 792

269 Smallmouth Bass 10/21/08 < 54 < 66

155 < 55 < 113 66 < 122 < 55 < 57 < 1020

323 MEAN BY-31 Freshwater Drum 05/20/08 < 44 < 62

144 < 50 130 68 < 114

46 < 39 < 1400

297 Silver Redhorse 05/20/08 < 46 < 58 < 147 < 63 102 71 < 128 < 41. < 48 < 1350

481 Channel Catfish 10/21/08

62 < 58

136 < 58 97 64 < 97 < 43 < 44 < 592 < 335 Common Carp 10/21/08

40 < 58

148 < 45 95 63 < 114 < 45 < 49 < 718 < 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 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 Cs-134 Cs-137 Ba-140 La-140 PERIOD BY-12 05/26/08 < 55 < 66 < 142 < 50 < 118 < 75 < 100 < 48 320 +/- 67 < 408 < 142 10/20/08 < 54 <65 < 163 <48 < 124 < 75 < 113 < 50 60 +/- 34 < 1190 < 330 MEAN 190 +/- 367 BY-34 05/26/08 < 86 < 87 < 207 < 72 < 234 < 100 < 155 < 126 94 +/- 59 < 610 < 195 10/20/08 < 30 < 33 < 96 < 32 < 64 < 43 < 69 < 26 < 34 < 640 < 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 BY-21 BY-22 BY-23 BY-24 BY-01 BY-04 BY-06 BY-08 I

01/02/08 01/08/08 21 +/- 5 23 +/- 5 25 +/- 5 24 +/- 5 *20 +/- 5 26 +/- 5 27 +/- 5 24 +/- 5 01/08/08 01/15/08 29 +/- 5 29 +/- 5 36 +/- 5 38 +/- 6 32 +/- 5 30 +/- 5 42 +/- 6 28 +/- 5 01/15/08 01/22/08 27 +/- 5 27 +/-5 30 +/- 5 31 +/- 5 27 +/- 5 31 +/- 5 29 +/- 5 31 +/- 5 01/22/08 01/29/08 34 +/- 5 35 +/-5 30 +/- 5 36 +/- 5 35 +/- 5 31 +/- 5 40 +/- 6 34 +/- 5 01/29/08 02/05/08 22 +/- 5 21 +/-4 14 +/- 4 21 +/- 4 24 +/- 5 22 +/- 5 20 +/- 4 21 +/- 5 02/05/08 02/12/08 30 +/- 5 28 +/-5 26 +/- 5 28 +/- 5 25 +/- 5 28 +/- 5 27 +/- 5 26 +/- 5 02/12/08 02/19/08 26 +/- 5 26 +/-5 22 +/- 5 26 +/- 5 23 +/- 5 30 +/- 5 26 +/- 5 24 +/- 5 02/19/08 02/25/08 16 +/- 4 12 +/- 4 15 +/- 4 17. +/- 4 19 +/- 5 21 +/- 5 16 +/- 5 17 +/- 5 02/25/08 03/04/08 23 +/- 5 22 +/- 5 18 +/- 5 18 +/- 5 21 +/- 4 19 +/- 4 23 +/- 5 22 +/- 4 03/04/08 03/10/08 22 +/- 5 25 +/- 5 24 +/- 5 27 +/- 5 22 +/- 5 20 +/- 5 21 +/- 5 20 +/- 5 03/10/08 03/18/08 18 +/- 4 15 +/- 4 17 +/- 4 17 +/- 4 19 +/- 5 21 +/- 4 19 +/- 4 19 +/- 5 03/18/08 03/24/08 16 +/- 4 14 +/- 4 12 +/- 4 10 +/- 4 11 +/-4 12 +/- 4 12 +/- 4 11 +/-4 03/24/08 04/01/08 13 +/- 4 13 +/- 4 13 +/- 4 14 +/- 4 13 +/-4 14 +/- 4 15 +/- 4 12 +/-4 04/01/08 04/08/08 17 +/-4 20 +/- 4 19 +/- 4 16 +/- 4 21 +/-4 22 +/- 4 21 +/-4 20 +/-4 04/08/08 04/16/08 9+/-3 8+/-3 8+/-3 7+/-3 9+/-3 10 +/- 3 9+/-3 9+/-3 04/16/08 04/22/08 23 +/-5 26 +/-5 23 +/-5 24 +/-5 18 +/-5 23 +/- 5 23 +/-5 23 +/-5 04/22/08 04/29/08 19 +/-4 19 +/-4 20 +/-4 13 +/-4 16 +/- 4 17 +/-4 15 +/-4 17 +/-4 04/29/08 05/06/08 18 +/-4 23 +/-4 26 +/-5 19 +/-4 20 +/- 4 19 +/-4 21 +/-4 18 +/-4 05/06/08 05/13/08 13 +/-4 13 +/-4 11 +/-4 16 +/-4 17 +/- 4 13 +/-4 14 +/-4 18 +/-4 05/13/08 05/20/08 14 +/-4 12 +/-4 9+/-3 12 +/-4 12 +/- 4 8+/-3 13 +/-4 12 +/-4 05/20/08 05/27/08 8+/-3 5+/-3 10 +/-4 10 +/-4 7+/-3 7+/-3 7+/-3 8+/-3 05/27/08 06/03/08 19 +/-4 12 +/-4 15 +/-4 16 +/-4 16 +/-4 10 +/- 4 15 +/-4 12 +/-4 06/03/08 06/10/08 10 +/-4 13 +/-4 12 +/-4 13 +/-4 10 +/-4 14 +/- 4 11 +/-4 12 +/-4 06/10/08 06/17/08 15 +/-4 14 +/-4 10 +/-4 9+/-4 9+/-4 11 +/-4 13 +/-4 12 +/-4 06/17/08 06/24/08 19 +/-4 13 +/-4 11 +/-4 13 +/-4 19 +/-4 13 +/-4 14 +/-4 13 +/-4 06/24/08 07/01/08 12 +/-4 12 +/-4 7+/-4 12 +/-4 12 +/-4 16 +/-4 14 +/-4 15 +/-4 07/01/08 07/08/08 15 +/-4 11 +/-4 12 +/-4 12 +/-4 12 +/-4 11 +/-4 15 +/-4 15 +/-4 07/08/08 07/15/08 9+/-4 13 +/-4 10 +/-4 10 +/-4 10 +/-4 11 +/-4 9+/-4 8+/-4 07/15/08 07/22/08 19 +/-5 17 +/-5 15 +/-5 21 5 18 +/-5 17 +/-5 .19 +/-5 17 +/-5 07/22/08 07/28/08 16 +/-4 21 +/-5 17 +/-4 18 +/-4 17 +/-5 17 +/-4 18 +/-4 20 +/-5 07/28/08 08/05/08 19 +/-4 14 +/-4 13 +/-4 16 +/-4 16 +/-4 12 +/- 4 21 +/-4 20 +/-4 08/05/08 08/12/08 19 +/-4 15 +/-4 16 +/-4 17 +/-4 20 +/-4 14 +/- 5 16 +/-4 19 +/-4 08/12/08 08/19/08 22 +/-5 23 +/-5 19 +/-5 23 +/-5 22 +/-5 21 +/- 5 18 +/-4 22 +/-5 08/19/08 08/26/08 18 +/- 4 18 +/- 4 14 +/-4 17 +/- 4 15 +/-4 18 +/- 4 18 +/-4 19 +/-4 08/26/08 09/02/08 35 +/- 5 27 +/- 5 25 +/-5 30 +/- 5 32 +/-5 36 +/- 5 31 +/-5 29 +/-5 09/02/08 09/09/08 15 +/- 4 16 +/- 4 15 +/-4 17 +/- 4 17 +/- 4 20 +/- 4 17 +/-4 19 +/-4 09/09/08 09/16/08 14 +/- 4 14 +/-4 10 +/-4 12 +/- 4 14 +/- 4 13 +/- 4 21 +/-4 16 +/-4 09/16/08 09/23/08 35 +/- 5 33 +/-5 29 +/-5 35 +/- 5 37 +/- 5 34 +/- 5 33 5 34 +/-5 09/23/08 09/30/08 36 +/- 6 28 +/-5 30 +/-5 35 +/- 6 38 +/- 6 31 +/- 5 35 +/-5 31 +/-5 09/30/08 10/07/08 22 +/- 5 16 +/-4 15 +/- 4 23 +/- 5 22 +/- 5 17 +/- 4 20 +/- 5 15 +/-4 10/07/08 10/14/08 13 +/- 4 16 +/-4 18 +/- 4 21 +/- 4 20 +/- 4 16 +/- 4 23 +/- 5 19 +/-4 10/14/08 10/20/08 18 +/- 5 1*5 +/-5 19 +/- 5 17 +/- 5 17 +/- 5 18 +/- 5 19 +/- 5 20 5 10120/08 10/28/08 11 +/-3 13 +/-4 12 +/- 4 13 +/- 4 11 +/-3 10 +/- 3 16 +/- 4 10 +/-3 10/28/08 11/04/08 32 +/-5 34 +/-5 33 +/- 5 35 +/- 5 37 +/-5 35 +/- 5 34 +/- 5 33 +/-5 11/04/08 11/11/08 16 +/-4 18 +/- 4 17 +/-4 15 +/- 4 13 +/-4 15 +/- 4 17 +/-4 18 +/-4 1 1/11/08 11/18/08 20 +/-5 13 +/- 4 15 +/-4 18 +/- 4 20 +/-5 13 +/- 4 19 +/- 4 16 +/-4 11/18/08 11/25/08 23 +/-5 20 +/- 4 15 +/-4 21 +/- 4 20 +/-4 15 +/- 4 20 +/-4 17 +/-4 11/25/08 12/02/08 17 +/-4 15 +/- 4 20 +/-4 23 +/- 4 24 +/-5 17 +/- 4 20 +/-4 20 +/-4 12/02/08 12/09/08 23 +/-5 18 +/- 4 21 +/-5 21 +/- 5 24 5 20 +/- 5 19 +/-4 18 +/-4 12/09/08 12/16/08 28 +/-5 21 +/- 5 25 +/-5 23 +/- 5 25 +/-5 25 +/- 5 27 +/- 5 26 +/-5 12/16108 12/22/08 35 +/-5 29 +/- 5 29 +/-5 35 +/- 5 35 +/-6 34 +/- 5 31 +/- 5 30 +/-5 12/22/08 12/30/08 30 +/-5 33 +/- 5 28 +/-5 27 +/- 5 28 +/-4 34 +/- 5 32 +/- 5 37 +/-5 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 MIN MAX MEAN+/- COLLECTION MIN MAX MEAN+/- COLLECTION MIN MAX MEAN+/-

PERIOD 2SD PERIOD 2SD PERIOD 2SD 01/02/08 - 01/29/08 21 38 30 +/- 10 01/02/08 01/29/08 20 42 31 +/- 12 01/02/08 01/29/08 24 34 29 +/- 9 01/29/08- 02/26/08 12 30 22 +/- 11 01/29/08 03/04/08 16 30 23 +/- 8 01/29/08 03/04/08 17 26 22 +/- 6 02/26/08- 04/01/08 10 27 17 +/- 10 03/03/08 04/01/08 11 22 17 +/- 8 03/04/08 04/01/08 11 20 15 +/- 9 04/01/08- 04/29/08 7 26 17 +/- 12 04/01/08 04/29/08 9 23 17 +/- 11 04/01/08 04/29/08 9 23 17 +/- 12 04/29/08- 06/03/08 5 26 14 +/- 10 04/29/08 06/03/08 7 21 13 +/- 10 04/29/08 06/03/08 8 18 14 +/- 9 06/03/08 - 07/01/08 7 19 12 +/- 5 06/03/08 07/01/08 9 19 13 +/- 5 06/03/08 07/01/08 12 15 13 +/- 3 07/01/08 - 07/28/08 9 21 15 +/- 8 07/01/08 07/28/08 9 19 15 +/- 7 07/01/08 07/28/08 8 20 15 +/- 10 07/28/08 - 09/02/08 13 35 20 +/- 12 07/28/08 09/02/08 12 36 21 +/- 14 07/28/08 09/02/08 19 29 22 +/- 9 09/02/08 - 09/30/08 10 36 23 +/- 20 09/02/08 09/30/08 13 38 26 +/- 19 09/02/08 09/30/08 16 34 25 +/- 18 09/30/08 - 10/28/08 11 23 16 +/- 7 09/30/08 10/28/08 10 23 17 +/- 8 09/30/08 10/28/08 10 20 16 +/- 9 10/28/08 - 12/02/08 13 35 21 +/- 14 10/28/08 12/02/08 13 37 21 +/- 16 10/28/08 12/02/08 16 33 21 +/- 14 12/02/08 - 12/30/08 18 35 27 +/- 10 12/02/08 12/30/08 19 35 28 +/- 11 12/02/08 12/30/08 18 37 28 +/- 15 01/02/08 - 12/30/08 5 38 19 +/- 15 01/02/08 - 12/30/08 7 42 20 +/- 16 01/02/08 - 12/30/08 8 37 20 +/- 14

.0" ON

TABLE C-V.3 CONCENTRATIONS OF GAMMA EMITTERS INAIR PARTICULATE SAMPLES COLLECTED IN THE VICINITY OF BYRON NUCLEAR GENERATING STATION, 2008 RESULTS IN UNITS OF E-3 PCI/CU METER +/- 2 SIGMA STC COLLECTION Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 Cs-134 Cs-137 Ba-140 La-140 PERIOD BY-01 01/02/08 04/01/08 <2 <5 < 18 <3 <9 <6 < 10 <2 <2 < 580 < 275 04/01/08 07/01/08 <3 <4 < 19 <2 <6 <5 <8 <3 <3 < 754 < 364 07/01/08 09/30/08 <3 < 11 < 50 <3 <7 < 12 < 21 <4 <2 < 32700 < 12300 09/30/08 12/30/08 <3 <5 < 13 <3 <8 <5 <9 <3 <2 < 439 < 105 MEAN BY-04 01/02/08 04/01/08 <2 <4 < 13 <2 <6 <4 <9 <2 <2 < 617 < 183 04/01/08 07/01/08 <4 <6 < 24 <4 <9 <5 <9 <4 <3 < 980 < 305 07/01/08 09/30/08 <3 < 13 < 45 <3 <9 < 15 < 24 <4 <3 < 48400 < 13500 09/30/08 12/30/08 <3 <6 < 20 <2 < 10 <6 < 12 <4 <3 < 561 < 155 0

MEAN BY-06 01/02/08 04/01/08 <2 <3 < 11 <2 <6 <5 <8 <3 <1 < 552 < 312 04/01/08 07/01/08 <2 <4 < 15 <2 <6 <5 <8 <2 <2 < 652 < 222 07/01/08 09/30/08 <4 <9 < 48 <2 < 12 < 11 < 17 <3 <3 < 44300 < 13900 09/30/08 12/30/08 <3 <5 < 14 <3 <7 <5 < 10 <3 <3 < 410 < 132 MEAN BY-08 01/02/08 04/01/08 <3 <6 <24 <4 <11 <7 <11 <4 < 4 < 974 < 417 04/01/08 07/01/08 <4 <8 < 25 <3 <9 <9 < 14 < 5 < 4 < 1370 < 491 07/01/08 09/30/08 <4 < 15 < 76 <3 <9 < 19 < 29 <4 < 3 < 51300 < 10300 09/30/08 12/30/08 <3 <4 < 14 <3 < 10 <5 <9 < 3 < 3 < 366 < 131 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 STC COLLECTION Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 Cs-134 Cs-137 Ba-140 La-140 PERIOD BY-21 01/02/08 - 04/01 /08 <4 <7 < 16 3 8 <6 < 14 <4 <3

931

420 04/01/08 - 07/01 /08 <3 <5 < 19 2 8 <7 < 11 <3 <3 < 1020

384 07101/08 - 09/30 /08 <3 < 10 < 55 3 10 < 14 < 25 <3 <2 < 36300 < 18700 09/30/08 - 12/30 /08 <4 <6 < 22 4 7 <7 < 10 <4 <3 < 533 < 173 MEAN BY-22 01102/08 04/01/08 <4 <5 <11 2 8 <5 <9 <3 <3 < 678 < 237 04/01/08 07/01/08 <2 <7 < 22 3 8 <6 <12 <4 <3 < 1090 < 290 07/01/08 09/30/08 <4 < 16

68 4 8 < 18 < 26 <4 <4 < 49300 < 25700 09/30/08 12/30/08 <3 <5 < 13 3 8 <5 <8 <2 <2 < 347

133 MEAN BY-23 01/02/08 04/01/08 < 3 < 5 < 18 < 3 < 7 < 5 < 7 < 2 <2

723

261 04/01/08 07/01/08 < 4 < 7 < 22 < 4 < 11 < 8 < 13 < 4 <4 < 1100

486 07/01/08 09/30/08 <4 < 10 < 48 <4 <9 <11 < 23 <3 <3 < 36300 < 13800 09/30/08 12/30/08 <3 <7 < 11 <3 <9 <6 <9 <4 <2

528 < 137 MEAN BY-24 01/02/08 04/01 <3 <7 < 22 <3 <9 <6 ~<11 <4 <3 < 855 < 326 04/01/08 07/01/08 <3 <5 < 22 < 3 < 8 <7 < 10 <3 <2 < 845 < 310 07/01/08 09/30/08 <4 < 10 < 60 <3 <9 < 14

29 <4 <3 < 39100 < 17500 09/30/08 12/30/08 <3 <5 < 19 <4 <5 <5 < 10 <3 <3 < 452 < 150 MEAN 0*

0

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 64 of 206 C-12

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 INDICATOR FARM COLLECTION BY-26-1 BY-20-1 BY-30 BY-30-1 BY-38 PERIOD 01/08/08 < 0.4 < 0.7 < 0.7 (1) (1) 02/05/08 < 0.9 < 0.8 03/04/08 < 0.7 < 0.7 04/01/08 < 0.7 < 0.7 < 0.8 (1) 05/06/08 < 0.3 < 0.4 < 0.7 05/20/08 < 0.6 < 0.9 < 1.0 06/03/08 < 0.5 < 0.6 < 0.6 06/17/08 < 0.7 < 0.8 < 0.8 07/01/08 < 0.6 < 0.7 < 0.8 07115/08 < 0.5 < 0.6 < 0.6 07/28/08 < 0.6 < 0.5 < 0.6 08/12/08 < 0.7 < 0.9 < 0.8 08/26/08 < 0.9 < 0.9 < 0.9 09/09/08 < 0.7 < 0.8 < 0.9 09/23/08 < 0.7 < 0.7 < 0.8 10/07/08 < 0.8 < 0.9 < 0.8 10/20/08 < 0.8 < 0.9 < 0.9 11/04/08 < 0.8 < 0.7 < 0.7 12/02/08 < 0.7 < 0.4 < 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 Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 Cs-134 Cs-137 Ba-140 La-140 PERIOD BY-20-1 01/08/08 <6 <6 < 14 <7 < 15 <6 <9 <5

26 <8 02/05/08 <7 <6 < 14 <8 < 17 <6 < 12 <5

32 < 11 03/04/08 <6 <6 < 16 <8 < 15 <6 < 10 <5

28 <8 04/01/08 <6 <5 < 12 <5 < 10 <5 < 10 <5 < 24 <4

.< 5 05/06/08 <4 < 10 <4 <10 <5 <8 <4 < 23 <8 05/20/08 <6 <7 <17 <8 <15 <7 <15 <6 < 43 <13 06/03/08 <8 <6

22 <9 <17 <8 < 14 <6 < 44 < 14 06/17/08 <5 <6 < 13 <5 <13 <6 < 10 <5 < 40 < 15 07/01/08 <6 <6 < 16 <7 < 14 <6 < 12 <5

41 < 12 07/15/08 <6 <5 < 15 <8 < 15 <7 < 12 <5 < 41 < 12 07/28/08 <7 <8 < 17 <6 < 18 <7 < 15 <6 < 48 < 15 08/12/08 <5 <6 <15 <6 < 13 <6 < 12 <5 < 39 < 14 08/26/08 <6 <5 < 16 <7 < 12 <7 < 12 <6 < 46 < 10 09/09/08 <6 <7 < 14 <5 < 12 <7 < 10 <5 < 43 <11 09/23/08 <6 <6 <15 <5 <12 <7 < 11 <5 < 42 <11 10/07/08 <3 <3 <9 <3 <7 <4 <6 <3 < 49 < 14 10/20/08 <2 <2 <6 <2 <5 <2 <5 <2 < 39 < 11 11/04/08 <1 <1 <4 <1 <2 <1 <2 <1 < 43 <13 12/02/08 <6 <6 <14 <6 <15 <6 < 11 <5 < 33 <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 Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 Cs-134 Cs-137 Ba-140 La-140 PERIOD BY-26-1 01/08/08 <7 <6 < 14 <6 < 14 <6 < 12 <5 < 21 <7 02/05/08 <5 <7 < 17 <6 < 15 <6 <9 <6 < 27 < 10 03/04/08 <5 <4 <11 <6 < 12 <5 <9 <5 < 21 <5 04/01/08 <5 <5 < 12 <8 < 11 <5 <8 <5 < 26 <9 05/06/08 <8 <7 < 19 <7 < 16 <7 < 12 <6 < 44 < 12 05/20/08 <5 <7 < 13 <5 < 12 < 10

<6 <5 < 42 < 13 06/03/08 <8 <7 < 15 <6 < 16 <7 < 12 <7 < 32 < 11 06/17/08 <5 <5 < 14 <6 < 10 <6 < 10 <5 < 37 <9 h) 07/01/08 <5 <6 < 12 <5 < 11 <6 < 10 <4 < 31 <8 07/15/08 <5 <5 < 14 <5 < 11 <6 < 10 <5 < 36 <9 07/28/08 <7 <7 < 18 <8 < 14 <7 < 13 <6 < 40 < 15 08/12/08 <5 <5 < 14 <6 < 10 <6 < 11 <4 < 35 < 11 08/26/08 <7 <7 < 19 <6 < 17 <7 < 13 <6 < 44 < 15 09/09/08 <6 <6 < 17 <6 < 13 <7 < 12 <5 < 45 < 14 09/23/08 <7 <7 < 15 <6 < 15 <7 < 13 <6 < 47 < 11 10/07/08 <1 <2 <4 <1 <3 <2 <3 <1 < 24 <7 10/20/08 <2 <3 <8 <3 <5 <3 <5 <2 < 47 < 12 11/04/08 <1 <1 <5 <1 <3 <2 <3 <1 < 48 < 14 12/02/08 <4 <5 < 12 <5 < 11 <5 <8 <4 < 29 < 10 MEAN BY-30 01/08/08 <6 <6 < 16 <9 <16 <6 <11 <6 < 6 <27 <6 (1)

ON, MEAN 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 Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 Cs-134 Cs-137 Ba-140 La-140 PERIOD BY-30-1 04/01/08 <6 <7 < 16 <7 *17 <7 < 11 <6 6 < 35 <12 (1) 05/06/08 <6 <6 < 14 <6 <12 <6 <9 <5 5 < 34 <9 05/20/08 <6 <7 < 14 <5 <15 <7 < 13 <6 7 < 47 < 15 06/03/08 <5 <5 <12 <6 < 12 <6 <9 <5 5

30 < 10 06/17/08 <6 <6 <12 <6 < 15 <7 < 12 <6 7

48 < 12 07/01/08 <6 <7 <16 <7 < 15 <6 < 10 <4 5 < 40 < 13 07/15/08 <6 <7 < 15 <5 < 15 <7 <12 <5 6

46 < 13 07/28/08 <5 <6 <15 <6 < 11 <5 < 11 <5 5 < 38 < 12 08/12/08 <8 <7 <17 <8 < 17 <7 < 14 <7 8 < 49 < 14 08/26/08 '<7 <8 < 21 <6 < 16 <7 < 13 <6 7 < 58 < 14 09/09/08 <6 <6 <16 <7 < 12 <6 < 11 <5 5 < 44 < 14 09/23/08 <5 <6 <18 <6 < 15 <6 < 12 <5 6 < 44 < 14 10/07/08 <1 <2 <5 <2 <4 <2 <3 <1 2 < 28 <8 10/20/08 <2 <3 <6 <2 <5 <3 <5 <2 2

40 < 10 11/04/08 <1 <1 <4 <1 <2 <1 <2 <1 1 < 46 < 13 12/02/08 <4 <5 < 11 <4 < 10 <5 <9 <4 5

26 <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 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-CONTROL Cabbage 08/27/08 <3 <3 <8 <3 <6 <3 <6 <24 <2 <3 <38 <9 Corn 08/27/08 <4 <5 <13 <4 <12 <6 .<11 <47 <5 <5 <71 < 18 MEAN BY-QUAD 1 Cabbage 08/27/08 <2 <3 <8 <3 <6 <3 <5 <24 <2 <3 <38 <11 Potatoes 08/27/08 <4 <4 <11 <4 <9 <5 <8 <33 <3 <4 <46 <12 C)b MEAN BY-QUAD 2 Onions 08/27/08 < 6 <6 < 14 < 5 < 12 < 7 < 11 < 54 <5 < 6 < 81 < 24 Swiss Chard 08/27/08 < 10 < 12 < 30 < 9 < 21 < 13 < 23 < 48 <9 < 10 < 142 < 43 MEAN - - - - - - - - - - - -

BY-QUAD 3 Corn leaves 09/09/08(1) < 10 < 12 <22 < 10 <24 < 15 < 19 < 57 < 11 < 11 < 104 < 34 Corn leaves 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 < 13 < 13 < 33 < 13 < 28 < 15 < 23 < 45 < 11 < 13 < 171 < 43 Rutabagas 08/27/08 <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 MEAN JAN - MAR APR - JUN JUL - SEP OCT- DEC CODE +/- 2 S.D.

IY-uI-1 19.8 3.8 21 21 20 BY-0 1-2 19.5 + 5.3 22 19 21 BY-04-1 22.8 + 4.4 22 25 24 BY-04-2 22.5 + 4.2 22 23 25 BY-06-1 19.0 + 4.3 20 19 21 BY-06-2 19.3 +/- 4.7 19 21 21 BY-08-1 19.5 _ 3.5 20 20 21 BY-08-2 19.3 _ 3.4 20 19 21 BY-21-1 19.8 +/- 3.8 20 21 21 BY-21-2 19.8 + 3.8 20 21 21 BY-22-1 24.8 + 4.4 24 26 27 BY-22-2 24.8 + 6.2 23 25 29 BY-23-1 23.3 +/- 5.7 24 25 25 BY-23-2 23.3 + 4.4 24 24 25 BY-24-1 22.0 +/- 4.9 22 22 25 BY-24-2 23.0 +/- 6.7 27 22 24 BY-101-1 19.8 + 5.3 21 20 22 BY-101-2 19.0 + 4.3 21 20 19 BY-1 02-1 23.8 + 2.5 24 24 25 BY-102-2 23.5 +/- 3.5 24 24 25 BY-103-1 23.3 + 4.4 25 24 24 BY-1 03-2 23.8 +/- 1.9 23 24 25 BY-1 03-3 22.0 +/- 7.2 (1) 23 25 BY-104-1 24.5 +/- 3.5 25 25 26 BY- 104-2 24.8 +/- 1.9 24 25 26 BY- 104-3 23.0 +/- 8.7 (1) 25 26 BY-105-1 26.7 + 5.0 24 27 29 BY-105-2 25.0 +/- 4.3 25 27 26 BY-106-1 24.0 +/- 4.0 25 25 25 BY-106-2 23.3 +/- 5.0 23 24 26 BY-1 07-1 25.5 + 5.8 25 29 26 BY-1 07-2 26.0 + 5.9 29 27 26 BY-1 07-3 22.0 + 2.0 (1) 23 22 BY-1 08-1 24.5 +/- 4.8 25 26 26 BY-1 08-2 23.0 + 4.3 25 24 23 BY-109-1 22.8 + 5.3 23 24 25 BY- 109-2 23.0 +/- 4.3 23 24 25 BY-110-1 21.5 + 4.8 23 22 23 BY-110-2 22.5 +/- 4.8 23 24 24 BY-1 11-3 24.0 + 2.8 24 25 25 BY-1 11-4 23.3 +/- 4.4 24 25 24 BY-1 12-3 22.8 +/- 3.8 23 24 24 BY-1 12-4 23.5 +/- 1.2 24 23 24 BY-113-1 22.8 +/- 4.1 23 23 25 BY-1 13-2 21.0 +/- 5.4 22 23 22 BY-1 14-1 21.3 +/- 7.5 20 22 26 BY-1 14-2 23.0 +/- 4.3 23 25 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 MEAN JAN - MAR APR - JUN JUL - SEP OCT - DEC CODE +/-2 S.D.

BY-115-1 24.0 +/- 5.7 22 22 BY-1 15-2 20.5 +/- 4.8 19 18 BY-1 16-1 20.5 +/- 3.5 21 18 BY-116-2 21.5 +/- 6.0 20 18 BY-116-3 21.3 +/- 7.6 (1) 17 BY-201-3 22.3 +/- 4.4 23 19 BY-201-4 23.0 +/- 5.4 24 19 BY-202-1 20.8 +/- 5.3 21 17 BY-202-2 23.8 +/- 5.3 26 20 BY-203-1 19.0 +/- 4.0 20 16 BY-203-2 22.0 +/- 3.7 21 20 BY-204-1 22.0 +/- 7.5 21 18 BY-204-2 24.8 +/- 1.9 24 24 BY-205-1 24.5 +/- 4.2 24 22 BY-205-2 21.8 +/- 5.3 22 18 BY-206-1 24.0 +/- 4.3 24 21 BY-206-2 24.0 +/- 5.4 26 20 BY-207-1 25.8 +/- 6.4 28 21 BY-207-2 23.3 +/- 3.4 24 21 BY-208-1 25.0 +/- 2.8 25 23 BY-208-2 25.3 +/- 1.9 26 24 BY-209-1 24.0 +/- 2.8 23 23 BY-209-4 24.0 +/- 4.3 24 21 BY-210-3 23.0 +/- 4.9 22 20 BY-210-4 22.5 +/- 6.8 22 18 BY-21 1-1 23.3 +/- 3.4 23 21 BY-211-4 22.3 +/- 6.6 26 19 BY-212-1 24.8 +/- 3.0 24 23 BY-212-4 24.3 +/- 4.7 26 (2)

BY-213-1 23.8 +/- 5.0 25 20 BY-213-4 26.0 +/- 9.1 29 20 BY-214-1 23.5 +/- 5.3 26 20 BY-214-4 23.5 +/- 5.0 26 20 BY-215-1 24.8 +/- 6.4 27 20 BY-215-4 25.5 +/- 6.2 27 21 BY-216-1 25.3 +/- 4.7 27 22 BY-216-2 23.0 +/- 5.2 22 20 BY-301-1 19.3 +/- 4.4 20 16 BY-302-1 23.3 +/- 6.2 26 19 BY-314-1 20.3 + 4.4 21 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 INNER RING OUTER RING SPECIAL INTEREST OTHER CONTROL PERIOD +/- 2 S.D.

JAN-MAR 23.3 +/- 3.9 24.3 +/- 4.5 22.3 +/- 6.4 22.1 +/- 4.3 20.0 +/- 0.0 APR-JUN 19.9 +/- 4.2 20.4 +/- 3.8 17.3 +/- 3.1 18.6 +/- 4.2 17.0 +/- 0.0 JUL-SEP 24.1 +/- 4.0 24.8 +/- 3.9 22.0 +/- 5.3 22.4 +/- 4.6 19.5 +/- 1.4 OCT-DEC 24.4 +/- 3.5 24.8 +/- 3.2 22.0 +/- 2.0 23.5 +/- 5.4 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 SAMPLES PERIOD PERIOD PERIOD MEAN ANALYZED MINIMUM MAXIMUM +/- 2 S.D.

INNER RING 139 16 29 22.9 +/- 5.3 OUTER RING 127 16 30 23.6 +/- 5.3 SPECIAL INTEREST 12 16 26 20.9 +/- 5.8 OTHER 56 16 29 21.7 +/- 5.9 CONTROL 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-f~A1yq 0.

2.0 -

01-01-00 BY-29 (C) Byron, Upstream 14.0 -

12:.0 -

-J 80-

-4.0 -

F' 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-) 4.04 a.

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 39O0 3500 31 Lo0 2700 2300

-J 1900 1500 1100 700 /

A

\

-`ý'

-300 - 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 C.

150--

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 400 U

U.

0.- \/ I\\

/./\"

I/

K7 m200~ - Ii 12-31-02 12-310-3 12-3D-04 BY-18 McCoy Farmstead Well dOO 400.

3W0D 2W00

'INý, / \ / / - I--,,, \/\,/\/\

01-1-001 -) I 12-31-00 12-31 .01 12,31-02 12-31-93 1 2- .3*1-r04 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

-J 150-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-

\/\ K /\

11,

\ \ /

-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 -

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 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 -

50 -I l I U

vII l l l 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 -

0-04/11/06 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 10 6

4.

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 03 30.0 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 60.0 50.0 40.0 C,.

03 30.0 9

LU 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 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 t0.0a 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 40.0 0.

30.0 0

LU w-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 60.0 50.0 40.0 E

C5, 0.*

CL. 30.0 m

w 0D 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 Milk Sr-89 pCi/L 83.5 95.8 0.87 A Sr-90 pCi/L 13.9 12.9 1.08 A E5848-396 Milk 1-131 pCi/L 57.3 60.0 0.96 A Ce-141 pCi/L 229 249 0.92 A Cr-51 pCi/L 336 359 0.94 A Cs-134 pCi/L 106 125 0.85 A Cs-137 pCi/L 141 146 0.97 A Co-58 pCi/L 71.8 70.8 1.01 A Mn-54 pCi/L 98.1 94.2 1.04 A Fe-59 pCi/L 102 102 1.00 A Zn-65 pCi/L 135 137 0.99 A Co-60 pCi/L 230 236 0.97 A E5850A-396 AP Ce-141 pCi 163 157 1.04 A Cr-51 pCi 233 227 1.03 A Cs-134 pCi 72.6 79.0 0.92 A Cs-1 37 pCi 98.3 92.0 1.07 A Co-58 pCi 46.7 44.7 1.04 A Mn-54 pCi 69.8 59.4 1.18 A Fe-59 pCi 72.2 64.5 1.12 A Zn-65 pCi 106 86.4 1.23 w Co-60 pCi 156 149 1.05 A E5849-396 Charcoal 1-131 pCi 65.5 60.1 1.09 A June 2008 E5971-396 Milk Sr-89 pCi/L 83.9 85.0 0.99 A Sr-90 pCi/L 14.4 15.8 0.91 A E5972-396 Milk 1-131 pCi/L 70.9 71.4 0.99 A Ce-141 pCi/L 157 174 0.90 A Cr-51 pCi/L 159 138 1.15 A Cs-134 pCi/L 69.7 76.7 0.91 A Cs-1 37 pCi/L 115 116 0.99 A Co-58 pCi/L 59.1 61.9 0.95 A Mn-54 pCi/L 139 135 1.03 A Fe-59 pCi/L 98.4 91.7 1.07 A Zn-65 pCi/L 129 127 1.02 A Co-60 pCi/L 101 104 0.97 A E5974-396 AP Ce-141 pCi 206 207 1.00 A Cr-51 pCi 173 164 1.05 A Cs-134 pCi 95.9 91.0 1.05 A Cs-137 pCi 142.0 138.0 1.03 A Co-58 pCi 72.0 73.4 0.98 A Mn-54 pCi 180 160.0 1.13 A Fe-59 pCi 108.0 109.0. 0.99 A Zn-65 pCi 159 150 1.06 A Co-60 pCi 129 124 1.04 A 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 0.88 A September 2008 E6284-396 Milk Sr-89 pCi/L 76.2 73.9 1.03 Sr-90 pCi/L 12.3 11.0 1.12 E6285-396 Milk 1-131 pCi/L 65.7 67.9 0.97 Ce-141 pCi/L 145 161 0.90 Cr-51 pCi/L 406 421 0.96 Cs-134 pCi/L 196 232 0.84 Cs-1 37 pCi/L 147 162 0.91 Co-58 pCi/L 167 179 0.93 Mn-54 pCi/L 165 166 0.99 Fe-59 pCi/L 161 144 1.12 Zn-65 pCi/L 305 319 0.96 Co-60 pCi/L 218 234 0.93 E6287-396 AP Ce-141 pCi 79.5 76.3 1.04 Cr-51 pCi 208 199 1.05 Cs-134 pCi 106 110 0.96 Cs-137 pCi 79.3 76.7 1.03 Co-58 pCi 87.7 84.4 1.04 Mn-54 pCi 90.3 78.6 1.15 Fe-59 pCi 81.7 68.3 1.20 Zn-65 pCi 144 151 0.95 Co-60 pCi 111 ill 1.00 E6286-396 Charcoal 1-131 pCi 93.2 90.0 1.04 A December 2008 E6415-396 Milk Sr-89 pCi/L 98.4 91.9 1.07 A Sr-90 pCi/L 18.0 12.6 1.43 N (1)

E6416-396 Milk 1-131 pCi/L 69.2 79.9 0.87 A Ce-141 pCi/L 177 191 0.93 A Cr-51 pCi/L 231 246 0.94 A Cs-134 pCi/L 117 134 0.87 A Cs-137 pCi/L 119 120 0.99 A Co-58 pCi/L 104 104 1.00 A Mn-54 pCi/L 153 152 1.01 A Fe-59 pCi/L 99.6 100 1.00 A Zn-65 pCi/L 177 183 0.97 A Co-60 pCi/L 133 133 1.00 A E6418-396 AP Ce-141 pCi 148 146 1.01 A Cr-51 pCi 202 187 1.08 A Cs-134 pCi 103 102 1.01 A Cs-137 pCi 95.4 91.2 1.05 A Co-58 pCi 81.4 79.2 1.03 A Mn-54 pCi 113 116.0 0.97 A Fe-59 pCi 76.5 76.4 1.00 A Zn-65 pCi 122 139 0.88 A Co-60 pCi 108 101 1.07 A 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) NCR 09-02 initiated to investigate the failure.

(a) Teledyne Brown Engineering reported result.

(b) The Analytics known value is equal to 100% of the parameterpresent in the standardas determined by gravimetric and/or volumetric measurements made during standardpreparation.

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

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

W-Acceptable with warning. Reported result falls within 0. 70-0.80 or 1.20-1.30. N = Not Acceptable. Reported result falls outside the ratio limits of < 0. 70 and > 1.30.

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 pCi/L 37.33 19.0 11.8 -25.2 N (1)

Sr-90 pCi/L 40.40 42.7 31.5 -49.0 A Ba-1 33 pCi/L 87.8 90.5 76.2 - 99.6 A Cs-1 34 pCi/L 80.67 88.9 72.9 - 97.8 A Cs-1 37 pCi/L 222.33 231 208 - 256 A Co-60 pCi/L 98.9 101.0 90.9-113 A Zn-65 pCi/L 352 350 315-408 A Gr-A pCi/L 13.0 12.7 6.02 - 18.7 A Gr-B pCi/L 32.7 36.2 23.8 - 43.8 A H-3 pCi/L 11100 11300 9840- 12400 A January 2008 RAD 72 Water Sr-89 ,pCi/L 69.0 65.3 53.0 - 73.4 A Sr-90 pCi/L 35.6 41.4 30.5 - 47.6 A Ba-133 pCi/L 25.9 25.7 20.0 - 29.5 A Cs-134 pCi/L 86.5 92.6 76.0- 102 A Cs-137 pCi/L 155 158 142- 176 A Co-60 pCi/L 16.0 14.4 11.4-18.7 A Zn-65 pCi/L 214 204 184 - 240 A Gr-A pCi/L 13.3 14.8 7.15-21.2 A Gr-B pCi/L 21.2 22.5 13.7- 30.6 A 1-131 pCi/L 22.8 23.6 19.6-28.0 A H-3 pCi/L 3390 3540 3000-3910 A April 2008 Rad 73 Water Sr-89 pCi/L 65.47 60.4 48.6 - 68.2 A Sr-90 pCi/L 39.80 39.2 .28.8-45.1 A Ba-133 pCi/L 59.63 58.3 48.3 - 64.3 A Cs-134 pCi/L 45.00 46.6 37.4-51.3 A Cs-137 pCi/L 97.97 102 91.8-115 A Co-60 pCi/L 75.47 76.6 68.9 - 86.7 A Zn-65 pCi/L 109 106 95.4 - 126 A Gr-A pCi/L 41.03 50.8 26.5 - 63.7 A Gr-B pCi/L 50.20 51.4 35.0 - 58.4 A 1-131 pCi/L 26.67 28.7 23.9 - 33.6 A H-3 pCi/L 11633 12000 10400 - 13200 A (1) Could find no cause for Sr-89 failure. Sample sent to outside lab for verification,but the outside laboratorywas 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 Engineeringreported result.

(b) The ERA known value is equalto 100% of the parameterpresent in the standardas determined by gravimetric and/or volumetric measurements made during standardpreparation.

(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 Water Cs-134 Bq/L -0.26 (1) A Cs-137 Bq/L 0.029 (1) A Co-57 Bq/L 21 22.8 16.0-29.6 A Co-60 Bq/L 8.2 8.40 5.88- 10.92 A H-3 Bq/L 473 472 330-614 A Mn-54 Bq/L 12 12.1 8.5- 15.7 A Sr-90 Bq/L 10.70 11.4 7.98- 14.82 A Zn-65 Bq/L 15.6 16.3 11.4-21.2 A 07-GrW18 Water Gr-A Bq/L 1.4 1.399 >0.0 - 2.798 A Gr-B Bq/L 3.06 2.43 1.22-3.65 A 07-MaS18 Soil Cs-134 Bq/kg 790 854.0 598-1110 A Cs-137 Bq/kg 568 545 382 - 709 A Co-57 Bq/kg 424 421 295 - 547 A Co-60 Bq/kg 2.307 2.9 (2) A Mn-54 Bq/kg 611 570 399 - 741 A K-40 Bq/kg 6.09 571 400 - 742 A Sr-90 Bq/kg 454 493.0 345 - 641 A Zn-65 Bq/kg 0.162 (1) A 07-RdF18 AP Cs-134 Bq/sample 2.73 2.5200 1.76-3.28 Cs-137 Bq/sample 2.88 2.7 1.89 - 3.51 Co-57 Bq/sample 3.493 3.55 2.49 -4.62 Co-60 Bq/sample 1.357 1.31 0.92-1.70 Mn-54 Bq/sample 0.006 (1)

Sr-90 Bq/sample 1.61 1.548 1.084 - 2.012 Zn-65 Bq/sample 2.59 2.04 1.43 - 2.65 07-GrF18 AP Gr-A Bq/sample 0.131 0.348 >0.0 - 0.696 Gr-B Bq/sample 0.261 0.286 0.143 - 0.429 January 2008 07-RdV18 Vegetation Cs-1 34 Bq/sample 5.25 6.28 4.40-8.16 Cs-1 37 Bq/sample 3.13 3.41 2.39 - 4.43 Co-57 Bq/sample 6.837 6.89 4.82 - 8.96 Co-60 Bq/sample 2.44 2.77 1.94-3.60 Mn-54 Bq/sample 4.45 4.74 3.32-6.16 K-40 Bq/sample 61.3 (1)

Sr-90 Bq/sample 1.33 1.273 0.891 - 1.655 Zn-65 Bq/sample 0.085 (1)

August 2008 08-MaW19 Water Cs-134 Bq/L 17.1 19.5 13.7-25.4 A Cs-137 Bq/L 21.4 23.6 16.5-30.7 A Co-57 Bq/L -0.044 (1) A Co-60 Bq/L 10.8 11.6 8.1 - 15.1 A H-3 Bq/L 334 341 239 - 443 A Mn-54 Bq/L 13.0 13.7 9.6- 17.8 A Sr-90 Bq/L 6.55 6.45 4.52- 8.39 A Zn-65 Bq/L 16.5 17.1 12.0-22.2 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 Water Gr-A Bq/L 0.0612 <0.56 (3) A Gr-B Bq/L 0.222 <1.85 (3) A 08-MaS19 Soil Cs- 134 Bq/kg 546 581 407 - 755 A Cs-137 Bq/kg 2.52 2.8 (2) A Co-57 Bq/kg 340 333 233 - 433 A Co-60 Bq/kg 157 145.0 102- 189 A Mn-54 Bq/kg 460 415 291 - 540 A K-40 Bq/kg 650 571 399 - 741 A Sr-90 Bq/kg 1.40 (1) A Zn-65 Bq/kg -1.53 (1) A 08-RdF19 AP Cs- 134 Bq/sample 2.46 2.6300 1.84-3.42 A Cs-137 Bq/sample 0.0063 (1) A Co-57 Bq/sample 1.36 1.50 1.05-1.95 A Co-60 Bq/sample 0.0143 (1) A Mn-54 Bq/sample 2.70 2.64 1.85 - 3.43 A Sr-90 Bq/sample 1.42 1.12 0.78-1.46 W Zn-65 Bq/sample 0.975 0.94 0.66- 1.22 A 08-GrF19 AP Gr-A Bq/sample -0.0037 (4) A Gr-B Bq/sample 0.540 0.525 0.263 - 0.788 A 08-RdV1 9 Vegetation Cs-134 Bq/sample 4.36 5.5 3.9 - 7.2 W Cs-137 Bq/sample -0.03 (1) A Co-57 Bq/sample 6.72 7.1 5.0-9.2 A Co-60 Bq/sample 4.04 4.70 3.3-6.1 A Mn-54 Bq/sample 5.22 5.8 4.1-7.5 A K-40 Bq/sample 64.4 (1)

Sr-90 Bq/sample 1.62 1.9 1.3-2.5 A Zn-65 Bq/sample 6.160 6.9 4.8 - 9.0 A (1) Not evaluated by MAPEP.

(2) Reported a statisticallyzero 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 Engineeringreported result.

(b) The MAPEP known value is equal to 100% of the parameterpresent in the standardas determined by gravimetric and/or volumetric measurements made during standardpreparation.

(c) DOE/MAPEPevaluation: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 MARY ............................................................................................................................. 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 RADIOACTIVE W ASTE .................................................................... 3 3.0. DO SE TO MAN ................................................................................................ 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 G aseous Effluents .................................................................... E-1.2 Table 1.2-1 Liq uid E ff lue nts ......................................................................... E -1.3 Table 3.1-1 Maximum Doses Resulting from Airborne Releases ................. E-1.4 Table 3.2-1 Maximum Doses Resulting from Liquid Discharges .................. E-1.8 Table 3.4-1 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.

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 10CFR50 Appendix I, 10CFR20 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.

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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.

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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-03 106 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 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) 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 Gases

1. Total Release Ci 5.47E-01 2.65E-01 2.23E+00 5.88E-01 3.63E+00

2. Avg. Release Rate uCi/sec 6.96E-02 3.37E-02 2.81E-01 7.40E-02 1.15E-02 Iodine-131

1. Total Release Ci 1.72E-05 4.24E-06 0.00E+00 0.00E+00 2.15E-05

2. Avg. Release Rate uCi/sec 2.19E-06 5.39E-07 0.OOE+00 0.00E+00 6.80E-07 Particulates Half Life >= 8 days

1. Total Release Ci 0.00E+00 1.33E-06 0.OOE+00 1.07E-06 2.40E-06

2. Avg. Release Rate uCi/sec 0.00E+00 1.69E-07 0.OOE+00 1.35E-07 7.59E-08 Tritium

1. Total Release Ci 1.14E+01 7.11E+00 6.44E+00 3.69E+00 2.87E+01

2. Avg. Release Rate uCi/sec 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 Gases

1. Total Release Ci 2.30E-01 2.25E-01 8.80E-04 7.41E+00 7.87E+00

2. Avg. Release Rate uCi/sec 2.93E-02 2.86E-02 1.lE-04 9.32E-01 2.49E-01 Iodine-131

1. Total Release Ci 2.36E-05 7.36E-05 0.OOE+00 2.17E-06 9.93E-05

2. Avg. Release Rate uCi/sec 3.OOE-06 9.35E-06 0.OOE+00 2.73E-07 3.14E-06 Particulates Half Life >= 8 days

1. Total Release Ci 0.OOE+00 1.91E-06 0.OOE+00 3.04E-06 4.95E-06

2. Avg. Release Rate uCi/sec 0.00E+00 2.43E-07 0.OOE+00 3.82E-07 1.56E-07 Tritium

1. Total Release Ci 1.19E+01 1.60E+01 1.45E+01 1.14E+01 5.38E+01

2. Avg. Release Rate uCi/sec 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 QTR 1 QTR 2 QTR 3 QTR 4 YEAR Fission and Activation Gases

1. Total Release Ci 2.21E-03 1.55E-03 2.12E-03 4.06E-03 9.35E-03

2. Avg. Diluted Conc. uCi/ml 6.81E-10 4.52E-10 5.24E-10 1.25E-09 6.68E-10 Tritium

1. Total Release Ci 4.77E+02 1.98E+02 5.75E+02 2.50E+02 1.50E+03

2. Avg. Diluted Conc. uCi/ml 1.47E-04 5.77E-05 1.42E-04 7.67E-05 1.07E-04 Dissolved and Entrained Gases

1. Total Release Ci 8.45E-03 5.40E-04 2.73E-04 5.10E-04 9.75E-03

2. Avg. Diluted Conc. uCi/ml 2.61E-09 1.57E-10 6.75E-11 1.57E-10 6.99E-10 Gross Alpha Radioactivity

1. Total Release Ci 0.QOE+00 0.OCE+00 0.ODE+0C 0.0QE+00 0.DCE+00 Volume of liquid waste liters 3. 24E+09 3.43E+09 4. 04E+09 3.26E+09 1.40E+I0 Volume of dil. water liters 0. OOE+00 0.00E+00 0. OE+00 0. OOE+00 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 Units QTR 1 QTR 2 QTR 3 QTR 4 YEAR Fission and Activation Gases

1. Total Release Ci 2.21E-03 1.55E-03 2.12E-03 4.06E-03 9.35E-03

2. Avg. Diluted Conc. uCi/ml 6.81E-10 4.52E-10 5.24E-10 1.25E-09 6.68E-10 Tritium

1. Total Release Ci 4.77E+02 1.98E+02 5.75E+02 2.50E+02 1.50E+03

2. Avg. Diluted Conc. uCi/ml 1.47E-04 5.77E-05 1.42E-04 7.67E-05 1.07E-04 Dissolved and Entrained Gases

1. Total Release Ci 8.45E-03 5.40E-04 2.73E-04 5.10E-04 9.75E-03

2. Avg. Diluted Conc. uCi/ml 2.61E-09 1.57E-10 6.75E-ii 1.57E-10 6.99E-10 Gross Alpha Radioactivi .ty

1. Total Release Ci 0.OOE+00 0.O0E+00 0.O0E+00 0.O0E+00 0.OOE+00 Volume of liquid waste liters 3.24E+09 3.43E+09 4.04E+09 3.26E+09 1.40E+10 Volume of dil. water liters 0. OE+00 0. OE+00 0. COE+00 0. 00E+00 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------------- NNUAL 2008 Age Dose Limit Max % of Annual - Limit Group Organ (mrem) (mrem) Limit 2008 - Admin. Any Organ INFANT THYROID 3.90E-02 1.13E+01 3. 47E-01 2008 - Admin. Total Body CHILD TBODY 6.83E-03 1.05E+01 6. 51E-02 2008 - T.Spc. Any Organ INFANT THYROID 3.90]E-02 1.50E+01 2.60E-01 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 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 NNUAL 2008 Dose Limit Max % of Annual - Limit (mrad) (mrad) Limit 2008 - Admin. Gamma 1.97E-02 7.50E+00 2. 63E-01 2008 - Admin. Beta 1.13E-03 1.50E+01 7. 52E-03 2008 - T.Spc. Gamma 1.97E-02 1.OOE+01 1.97E-01 Receptor: 4 Composite Crit. Receptor - NG Distance: 0.00 (meters) Compass Point: NA 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 2008 - T.Spc. Beta 1.131E-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 - 1.6 114 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 2008 --

Ag e Dose Limit Max % of Annual - Limit Gr oup Organ (mrem) (mrem) Limit 2008 - Admin. Any Organ INFANT THYROID 3.90E-02 1.13E+01 3.47E-01 2008 - Admin. Total Body CHILD TBODY 6.83E-03 1.05E+01 6.51E-02 2008 - T.Spc. Any Organ INFANT THYROID 3.90E-02 1.50E+01 2.60E-01 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 2008 - T.Spc. Total Body CHILD TBO DY 6.83]E-03 1.50E+01 4.56E-02 Receptor: 5 Composite Crit. Receptor - IP Distance: 0.00 (meters) Compas s 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 - 1.7 115 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 Max % of Annual - Limit (mrad) (mrad) Limit 2008 - Admin. Gamma 1.97E-02 7.50E+00 2. 63E-01 2008 - Admin. Beta 1.13E-03 1.50E+01 7.52E-03 2008 - T.Spc. Gamma 1.97E-02 1.OOE+01 1.97E-01 Receptor: 4 Composite Crit. Receptor - NG Distance: 0.00 (meters) Compass Point: NA 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 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) ---- =ANNUAL 2008 Agegrp Bone Liver Thyroid Kidney Lung GI-LLI Skin TB ADULT 2.48E-03 1.49E-01 1.47E-01 1.50E-01 1.45E-01 1.67E-01 0.OOE+00 1.49E-01 TEEN 2.62E-03 1.13E-01 1.10E-01 1.10E-01 1.09E-01 1.24E-01 0.OOE+00 1. 12E-01 CHILD 3.26E-03 1.25E-01 1.23E-01 1.22E-01 1.21E-01 1.27E-01 0.OOE+C0 1.23E-01 INFANT 5.23E-06 5.35E-02 5.36E-02 5.35E-02 5.35E-02 5.35E-02 0.OOE+00 5 . 35E-02 SITE DOSE LIMIT ANALYSIS A NNUAL 2008 Age Dose Limit Max % of Annual - Limit Group Organ (mrem) (mrem) Limit 2008 - Admin. AnyOrgan ADULT GILLI 1. 67E-01 7.50E+00 2. 22E+00 2008 - Admin. Total Body ADULT TBODY 1. 49E.-01 2.25E+00 6. 61E+00 2008 - T.Spc. Any Organ ADULT GILLI 1.67E-01 1.00E+01 1.67E+00 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 1.49E-01 3.OOE+00 4.96E+00 Critical Pathway: Fresh Water Fish- Sport (FFSP)

Major Contributors ( 0% or greater to total)

Nuclide Percentage H-3 9. 72E+01 MN-54 5. 17E-02 FE-59 8.46E-03 CO-58 5. 88E-01 C0-60 4.03E-01 NB-95 1. 76E-04 AG-I1OM 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) ---- =ANNUAL 2008 Agegrp Bone Liver Thyroid Kidney Lung GI-LLI Skin TB ADULT 2.48E-03 1.49E-01-I.47E-01 1.50E-01 1.45E-01 1.67E-01 0.OOE+00 1. 49E-01 TEEN 2.62E-03 1.13E-01 1.10E-01 1.10E-01 1.09E-01 1.24E-01 0.OOE+00 1. 12E-01 CHILD 3.26E-03 1.25E-01 1.23E-01 1.22E-01 1.21E-01 1.27E-01 0.OOE+00 1.23E-01 INFANT 5.23E-06 5.35E-02 5.36E-02 5.35E-02 5.35E-02 5.35E-02 0.OOE+00 5. 35E-02 SITE DOSE LIMIT ANALYSIS ANNUAL 2008 Age Dose Limit Max % of Annual - Limit Group Organ (mrem) (mrem) Limit 2008 - Admin. Any Organ ADULT GILLI 1.67E-01 7.50E+00 2. 22E+00 2008 - Admin. Total Body ADULT TBODY 1.49E-01 2.25E+00 6. 61E+00 2008 - T.Spc. Any Organ ADULT GILLI 1.67E-01 l.OOE+01 1.67E+00 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+00 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 1.49E-01 3.OOE+00 4.96E+00 Critical Pathway: Fresh Water Fish - Sport (FFSP)

Major Contributors ( 0% or greater to total)

Nuclide Percentage H-3 9. 72E+01 MN-54 5.17E-02 FE-59 8.46E-03 CO-58 5. 88E-01 CO-60 4.03E-01 NB-95 1. 76E-04 AG-11OM 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 FIRST QUARTER SECOND QUARTER THIRD QUARTER FOURTH QUARTER ANNUAL GAMMA AIR (mrad) 4.000E-06(ESE) 1.480E-06( SE) 3.530E-03(SSE) 3.080E-06(SSE) 3.537E-03(SSE)

BETA AIR (mrad) 1.650E-05(ESE) 6. 710E-06 (NNW) 1.880E-03( NW) 1.990E-05(NNW) 1.899E-03( NW)

WHOLE BODY (mrem) 1.960E-06( SE) 9.180E-07( SE) 1.920E-03(SSE) 1.610E-06(SSE) 1.924E-03(SSE)

SKIN (mrem) 6.120EL06( SE) 2.800E-06( SE) 3. 920E-03 (SSE) 6.220E-06(SSE) 3.933E-03(SSE)

ORGAN (mrem) 2.180E-04(ESE) 1.090E-04 (NNW) 1.240E-04( NW) 8.020E-05(NNW) 4.753E-04(NNW)

CRITICAL PERSON Teenager Teenager Teenager Teenager Teenager CRITICAL ORGAN Thyroid Thyroid Liver Liver Thyroid COMPLIANCE STATUS 10 CFR 50 APP. I 10 CFR 50 APP.I TYPE OF DOSE QUARTERLY OBJECTIVE % OF APP. I YEARLY OBJECTIVE % OF APP. I GAMMA AIR (mrad) 5.0 0.07 10.0 0.04 BETA AIR (mrad) 10.0 0.02 20.0 0.01 WHOLE BODY (mrem) 2.5 0.08 5.0 0.04 SKIN (mrem) 7.5 0.05 15.0 0.03 ORGAN (mrem) 7.5 0.00 15.0 0.00 CRITICAL PERSON Teena ger Teenager CRITICAL ORGAN Thyro id Thyroid Calculation used release data-from the following:

Unit 1 - Vent Date of calculation: 2/17/2009 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) 1.560E-06(ESE) 9.810E-07( SE) 4.970E-09(SSE) 1.030E-04 (SSE) 1.048E-04 (SSE)

BETA AIR (mrad) 6.840E-06(ESE) 5.530E-06(NNW) 2.720E-08( NW) 4.210E-04 (NNW) 4. 328E-04 (NNW)

WHOLE BODY (mrem) 1.350E-06( SE) l.11OE-06( SE) 2.330E-09(SSE) 5.580E-05(SSE) 5.769E-05(SSE)

SKIN (mrem) 3.120E-06( SE) 2.620E-06( SE) 9.820E-09(SSE) 2.540E-04 (WNW) 2.563E-04 (WNW)

ORGAN (mrem) 2.280E-04(ESE) 2.550E-04(NNW) 2.770E-04( NW) 2.420E-04(NNW) 9.040E-04 (NNW)

CRITICAL PERSON Teenager Teenager Teenager Teenager Teenager CRITICAL ORGAN Thyroid Liver Lung Thyroid Lung COMPLIANCE STATUS 10 CFR 50 APP. I 10 CFR 50 APP.I TYPE OF DOSE QUARTERLY OBJECTIVE % OF APP. I YEARLY OBJECTIVE % OF APP. I GAMMA AIR (mrad) 5.0 0.00 10.0 0.00 BETA AIR (mrad) 10.0 0.00 20.0 0.00 WHOLE BODY (mrem) 2.5 0.00 5.0 0.00 SKIN (mrem) 7.5 0.00 15.0 0.00 ORGAN (mrem) 7.5 0.00 15.0 0.01 CRITICAL PERSON Teenager Teenager CRITICAL ORGAN Liver Thyroid Calculation used release data from the following:

Unit 2 - Vent Date of calculation: 2/17/2009 Data Recovery 99.4%

(priority parameters)

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 0 0 0 0 0 NNE 0 0 0 0 0 NE 0 0 0 0 0

.0 ENE 0 0 0 0 E 0 0 0 0 0 ESE 0 0 0 0 0 SE 0 0 0 2 SSE 0 0 0 0 0 S 0 0 0 0 0 SSW 0 0 0 0 0 SW 0 0 0 0 0 WSW 0 0 0 0 1 W 0 0 0 5 0 5 WNW 0 0 0 0 0 0 NW 0 0 0 0 0 0 NNW 0 0 0 0 0 0 Variable 0 0 0 0 0 0 0 Total 0 .0 7 0 0 8 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 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 0 0 0 0 0 NNE 0 0 0 0 0 NE 0 0 0 0 0 ENE 0 0 0 0 0 1 E 0 1 0 ESE 0 0 1 0 1 SE 1 0 0 0 1 SSE 0 5 0 7 S 5 11 0 17 ssw 5 9 1 0 15 SSW 4 0 0 0 4 0 0 0 0 0 w

4 1 0 0 5 WNW 3 0 0 0 3 NW 3 0 0 0 3 NNW 2 0 0 0 2 Variable 0 0 0 0 0 0 Total 27 23 8 1 0 0 59 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: 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 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 0 NNE 0 0 0 NE 0 0 0 ENE 0 0 0 E 0 0 0 ESE 0 0 2 SE 0 0 0 SSE 0 0 0 S 0 0 0 SSW 0 0 0 SW 0 0 0 WSW 0 0 1 W 0 0 4 WNW 0 0 1 NW 0 0 0 NNW 0 0 0 Variable 0 0 0 0 0 0 0 Total 0 0 0 5 3 0 8 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 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 0 4 0 0 4 NNE 0 1 0 0 3 NE 0 0 0 0 0 ENE 0 0 0 0 0 E 0 0 0 1 ESE 0 0 2 SE 0 0 1 SSE 0 0 0 S 0 0 0 SSW 0 0 0 SW 0 0 0 WSW 0 0 0 W 0 0 4 WNW 0 2 3 NW 0 0 0 NNW 0 0 1 Variable 0 0 0 0 0 0 0 Total 0 0 8 6 3 2 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 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 7 0 0 9 NNE 0 0 0 1 1 0 2 NE 0 0 1 1 0 0 2 ENE 0 0 0 0 0 0 0 E 0 0 3 1 0 0 4 ESE 0 0 0 1 1 0' 2 SE 0 0 1 0 0 0 1 SSE 0 0 0 1 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 3 1 0 5 W 0 0 9 3 1 5 18 WNW 0 0 5 1 0 9 15 NW 0 2 3 2 0 0 7 NNW 0 0 '2 6 0 0 8 Variable 0 0 0 0 0 0 0 Total 0 2 27 27 .4 14 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: 10 134 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 Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N '0 6 11 8 1 0 26 NNE 0 2 4 9 2 0 17 NE 0 1 5 0 0 7 ENE 0 1 4 .4 0 0 9 E 0 3 4 4 0 0 11 ESE 0 0 0 13 10 4 27 SE 0 0 6 19 9 0 34 SSE 0 1 4 13 18 5 41 S 0 1 6 11 34 23 75 SSW 2 1 4 10 13 7 37 SW 0 6 10 5 0 22 WSW 0 5 16 14 4 0 39 W 1 4 13 5 7 0 30 WNW 0 4 15 20 2 0 41 NW 1 5 18 36 1 0 61 0 2 8 4 0 0 14 Variable 0 0 0 0 0 0 0 Total 4 37 124 181 106 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 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 NNE 0 0 0 0 0 0 NE 0 0 0 0 0 0 ENE 1 0 1 0 0 2 E 1 0 0 0 0 1 ESE 1 0 0 0 0 1 SE 0 0 0 1 0 1 SSE 0 0 0 0 0 1 S 0 0 0 1 5 7 SSW 0 2 2 1 8 SW 1 7 4 0 16 WSW 1 1 2 0 4 W 6 0 0 0 6 WNW 1 1 0 0 3 NW 3 3 0 0 6 NNW 1 2 0 0 3 Variable 0 0 0 0 0 Total 13 17 10 6 59 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: 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 Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 1 0 1 NNE 0 0 0 0 NE 0 0 0 0 ENE 1 0 0 E 1 2 0 3 ESE 1 5 0 6 SE 3 5 0 8 SSE 2 6 0 9 S 2 10 0 12 SSW 5 1 0 6 SW 3 2 0 5 WSW 7 0 0 7 W 9 0 0 9 WNW 7 0 0 7 NW 5 0. 6 NNW 1 0 0 2 Variable 0 30 0 0 0 Total 47 34 1 0 82 Hours of calm in this stability class: 1 Hours of missing wind measurements in this stability class: 1 Hours of missing 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- 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 Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 6 11 2 0 22 NNE 12 10 2 0 28 NE 10 10 0 3 27 ENE 15 18 4 1 44 E 16 25 8 1 58 ESE 2 10 12 4 29 SE 2 13 18 11 50 SSE 8 24 34 9 80 S 12 28 28 24 94 SSW 10 30 22 5 69 SW 16 35 10 10 72 WSW 13 21 7 2 45 W 20 20 7 1 50 WNW 10 15 2 *0 30 NW 13 22 0 0 39 NNW 22 21 0 0 45 Variable 0 0 0 0 0 Total 10 45 187 313 156 71 782 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: 17 150 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 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 5 0 13 NNE 1 3 2 6 NE 1 0 0 1 ENE 5 4 2 11 E 6 36 0 42 ESE 5 22 1 28 SE 4 22 5 31 SSE 5 27 2 34 S 17 23 3 43 SSW 14 15 2 31 SW 8 10 0 18 WSW 11 3 0 14 W 14 7 0 21 WNW 16 2 0 18 NW 23 3 0 26 NNW 12 19 0 31 Variable 0 0 0 0 Total 150 201 17 0 368 Hours of calm in this stability class: 10 Hours of missing wind measurements in this stability class: 6 Hours of missing 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 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 23 37 13 75 NNE 14 21 5 40 NE 12 7 10 36 ENE 11 8 4 25 E 13 9 0 22 ESE 13 9 7 30 SE 7 22 6 38 SSE 5 29 16 51 S 8 18 33* 64 SSW 6 11 14 37 SW 8 40 24 76 WSW 15 26 10 53 W 10 45 9 69 WNW 13 28 7 56 NW 18 23 14 60 NNW 10 25 17 57 Variable 0 0 0 0 Total 21 186 358 189 32 3 789 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: 5 163 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 0 1 0 0 1 NNE 2 4 0 0 9 NE 3 3 0 0 7 ENE 0 1 0 0 2 E 2 4 2 0 8 ESE 3 12 4 0 20 SE 8 27 11 0 47 SSE 4 5 7 0 21 S 3 9 2 0 16 SSW 10 10 0 0 23 SW 8 7 0 0 20 WSW 2 0 0 0 5 W 2 3 0 0 14 WNW 2 3 1 0 0 8 NW 3 5 4 0 0 13 NNW 2 1 7 1 0 0 11 Variable 0 0 0 0 0 0 0 Total 10 28 69 92 26 0 225 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: 5 166 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 - December2008 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 4 1 0 0 0 0 5 NNE 0 0 0 0 0 0 0 NE 1 0 0 0 0 0 1 ENE 0 1 0 0 0 0 1 E 2 5 0 0 0 0 7 ESE 0 8 0 0 0 0 8 SE 1 0 0 0 12 SSE 2 11 0 0 0 0 13 S 5 2 0 0 0 0 7 SSW 4 0 0 0 5 SW 0 1 0 0 0 0 WSW 0 0 0 0 0 0 0 W 0 0 0 0 0 0 0 WNW 6 0 0 0 0 0 6 NW 7 0 0 0 0 0 7 NNW 5 0 0 0 0 0 5 Variable 0 0 0 0 0 0 0 Total 37 40 1 0 0 0 78 Hours of calm in this stability class: 7 Hours of missing wind measurements in this stability class: 4 Hours of missing stability measurements in all stability classes: 0 173 of 206

Byron Generating Station Period of Record: October - December2008 Stability Class - Extremely Unstable - 25OFt-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 NNE 0 NE 0 ENE 0 E 0 ESE 1 SE 0 SSE 0 S 0 SSW 0 SW 0 WSW 0 W 2 WNW 5 NW 1 NNW 0 Variable 0 Total 10 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: 0 174 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

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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 Location Designation Tables Table A-i: Radiological Groundwater Protection Program - Sampling Locations, Distance and Direction, Byron Nuclear Generating Station, 2008 Figures Figure A-I: Monitoring Well Locations, Byron Nuclear Generating Station, 2008 (Extra wells noted on map are for reference only.)

Appendix B Data Tables Tables Table B-1.1 Concentrations of Tritium and Strontium in Groundwater Samples Collected in the Vicinity of Byron Nuclear Generating Station, 2008.

Table B-1.2 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 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.

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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 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.

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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 weapons strike air molecules. Tritium is also produced during nuclear 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.

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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 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 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 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.

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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.

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3. Actions to Recover/Reverse Plumes No actions were undertaken to recover/reverse plumes in 2008.

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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 Distance and Direction AR-1 Monitoring Well Permanent 0.36 miles/NNW AR-10 Monitoring Well Permanent 0.28 miles/NE AR-11 Monitoring Well Permanent 1.36 miles/WNW AR-2 Monitoring Well Permanent 0.6 miles/NW AR-3 Monitoring Well Permanent 0.8 miles/NW AR-4 Monitoring Well Permanent 1.36 miles/WNW AR-5 Monitoring Well Permanent 1.92 miles/WNW AR-6 Monitoring Well Permanent 2.04 miles/WNW AR-7 Monitoring Well Permanent 0.04 miles/W AR-8 Monitoring Well Permanent 0.12 miles/S AR-9 Monitoring Well Permanent 0.24 miles/E CAR-1 Monitoring Well Permanent 2.25 miles/WNW CAR-2 Monitoring Well Permanent 1.52 miles/WNW CAR-3 Monitoring Well Permanent 0.16 miles/SE DF-24 (EPA well) Monitoring Well Permanent 1.36 miles/WNW GW-9 Monitoring Well Permanent 0.9 miles/WNW MW-1 (EPA well) Monitoring Well Permanent 0.6 miles/NW MW-3 (EPA well) Monitoring Well Permanent 0.8 miles/NW TW-13 Monitoring Well Permanent 2.3 miles/WNW TW-14 Monitoring Well Permanent 2.25 miles/WNW TW-15 Monitoring Well Permanent 2.2 miles/WNW Well 7 Monitoring Well Permanent 0.4 miles/SE 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 INTHE 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.

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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 < 30 < 51 < 2 <2 <6 <2 <5 <3 <5 <2 <2 < 45 < 14 AR-10 09/30/08 <27 <19 <2 <3 <6 <2 <5 <3 <5 <2 <2 < 45 < 15 AR-11 10/01/08 < 23 < 48 < 2 <2 <6 <2 <4 <3 <4 <2 <2 < 38 < 13 AR-2 10/01/08 < 26 < 45 < 2 <3 <7 <2 <5 <3 <5 <2 <3 < 39 < 11 AR-3 10/01/08 < 22 < 35 < 2 <3 <6 <3 <4 <3 <5 <2 <2 < 33 <12 AR-4 10/01/08 <25 <19 <2 <3 <7 <2 <5 <3 <5 <2 <2 < 39 < 11 AR-5 10/01/08 <27 89 +/-44 <2 <3 <7 <2 <5 <3 <5 <2 <2 < 39 *<15 AR-6 10/01/08 < 20 64 +/- 33 < 2 <2 <5 <2 <3 <2 <4 <2 <2 < 36 *<12 AR-7 09/30/08 <32 71 +/-37 <3 <3 <8 <2 <6 <4 <6 <3 <3 < 47 *<13

<12 AR-8 09/30/08 < 24 < 17 <2 <2 <6 <2 <4 <3 <4 <2 <2

40 < 13 AR-9 09/30/08 <22 <16 <2 <2 <6 <2 <4 <3 <4 <2 <2 < 38 CAR-1 10/01/08 < 16 < 11 < 1 <2 <4 <1 <3 <2 <3 <1 <1 < 24 <7 CAR-2 10/01/08 < 32 < 27 < 3 <3 <7 <3 <6 <4 <6 <3 <3 < 45 < 14 CAR-3 09/30/08 21 < 15 < 2 <2 <6 <2 <3 <2 <4 <2 <2 < 37 < 13 GW-9 10/02/08 <25 < 17 < 2 <2 <5 <2 <4 <2 <4 <2 <2 < 34 < 11 TW-13 10/02/08 < 28 98 +/- 36 < 2 <3 <6 <2 <5 <3 <5 <2 <2 < 40 < 11 TW-14 10/02/08 <25 <17 <2 <2 <6 <2 <4 <3 <5 <2 <2 < 33 < 11 TW-15 10/02/08 < 19 48 +/-26 <2 <2 <4 <2 <3 <2 <3 <2 <2 < 26 <8 WELL 7 10/02/08 < 31 < 49 <2 <3 <7 <3 <5 <4 <6 <3 <3 < 47 < 14 FO

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