Text

Annual Radiological Environmental Operating Report (AREOR)
	ML11137A061
Person / Time
Site:	Byron
Issue date:	05/13/2011
From:	Tulon T; Exelon Corp, Exelon Generation Co, Exelon Nuclear
To:	; Document Control Desk, Office of Nuclear Reactor Regulation
References
	1.10.0101, BYRON 2011-0071
	Download: ML11137A061 (209)
	v • d • e

Exelon Generation Company, LLC www.exeloncorp.com Exelo5n(

Byron Station Nuclear 445o North German Church Road Byron, IL61010-9794 May 13, 2011 LTR:* BYRON 2011-0071 File: 1.10.0101 United States Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555-0001 Byron Station, Units 1 and 2 Facility Operating License Nos. NPF-37 and NPF-66 NRC Docket Nos. STN 50-454 and STN 50-455

Subject:

2010 Annual Radiological Environmental Operating Report (AREOR)

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

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

Ifyou have any questions regarding this information, please contact David Gudger, Regulatory Assurance Manager, at (815) 406-2800.

Respectfully, Tim y J. Tulon Sit ice President B on- Nuclear Generating Station TJT/JG/TLH/cy Attachments: AREOR

Docket No: 50-454 50-455 BYRON NUCLEAR GENERATING STATION UNITS 1 and 2 Annual Radiological Environmental Operating Report 1 January Through 31 December 2010 Prepared By Teledyne Brown Engineering Environmental Services Nuclear Byron Nuclear Generating Station Byron, IL 61010 May 2011 1 of 208

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Table Of Contents I. Sum m ary and Conclusions .............................................................................................. 1 II. Introduction ............................................................................................................. 3 A. O bjectives of the REM P .................................................................................. 3 B. Im plem entation of the Objectives .................................................................. 3 I1l. Program Description ................................................................................................ 3 A. Sam ple Collection ........................................................................................... 3 B. Sam ple Analysis .............................................................................................. 6 C. Data Interpretation ......................................................................................... 6 D. Program Exceptions ....................................................................................... 7 E. Program Changes ......................................................................................... 9 IV. Results and Discussion ......................................................................................... 10 A. Aquatic Environm ent ..................................................................................... 10

1. Surface W ater ..................................................................................... 10

2. Ground W ater ..................................................................................... 10

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

4. Sedim ent ............................................................................................ 11 B. Atm ospheric Environm ent ........................................................................... 12

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

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

b. Airborne Iodine ...................................................................... 12

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

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

b. Vegetation ................................................................................ 13 C. Am bient Gam m a Radiation ......................................................................... 13 D. Land Use Survey .......................................................................................... 14 E. Errata Data ................................................................................................... 14 F. Summary of Results - Inter-laboratory Comparison Program ...................... 15 3 of 208

Appendices Appendix A Radiological Environmental Monitoring Report Summary Tables Table A-1 Radiological Environmental Monitoring Program Summary for Byron Nuclear Generating Station, 2010 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, 2010 Table B-2 Radiological Environmental Monitoring Program - Summary of Sample Collection and Analytical Methods, Byron Nuclear Generating Station, 2010 Figures Figure B-1 Inner and Outer Ring TLD Locations of the Byron Nuclear Generating Station, 2010 Figure B-2 Onsite Air Sampling Locations of the Byron Nuclear Generating Station, 2010 Figure B-3 Offsite Air Sampling Locations of the Byron Nuclear Generating Station, 2010 Figure B-4 Ingestion and Waterborne Exposure Pathway Sampling Locations of the Byron Nuclear Generating Station, 2010 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, 2010.

Table C-1.2 Concentrations of Tritium in Surface Water Samples Collected in the Vicinity of Byron Nuclear Generating Station, 2010.

Table C-1.3 Concentrations of Gamma Emitters in Surface Water Samples Collected in the Vicinity of Byron Nuclear Generating Station, 2010

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Table C-11.1 Concentrations of Tritium in Ground Water Samples Collected in the Vicinity of Byron Nuclear Generating Station, 2010.

Table C-11.2 Concentrations of Gamma Emitters in Ground Water Samples Collected in the Vicinity of Byron Nuclear Generating Station, 2010.

Table C-111.1 Concentrations of Gamma Emitters in Fish Samples Collected in the Vicinity of Byron Nuclear Generating Station, 2010.

Table C-IV.1 Concentrations of Gamma Emitters in Sediment Samples Collected in the Vicinity of Byron Nuclear Generating Station, 2010.

Table C-V.1 Concentrations of Gross Beta in Air Particulate Samples Collected in the Vicinity of Byron Nuclear Generating Station, 2010.

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, 2010.

Table C-V.3 Concentrations of Gamma Emitters in Air Particulate Samples Collected in the Vicinity of Byron Nuclear Generating Station, 2010.

Table C-VI.1 Concentrations of 1-131 in Air Iodine Samples Collected in the Vicinity of Byron Nuclear Generating Station, 2010.

Table C-VII.1 Concentrations of 1-131 in Milk Samples Collected in the Vicinity of Byron Nuclear Generating Station, 2010.

Table C-VII.2 Concentrations of Gamma Emitters in Milk Samples Collected in the Vicinity of Byron Nuclear Generating Station, 2010.

Table C-VIII.1 Concentrations of Gamma Emitters in Vegetation Samples Collected in the Vicinity of Byron Nuclear Generating Station, 2010.

Table C-IX.1 Quarterly TLD Results for Byron Nuclear Generating Station, 2010.

Table C-IX.2 Mean Quarterly TLD Results for the Inner Ring, Outer Ring, Special Interest, Other and Control Locations for Byron Nuclear Generating Station, 2010.

Table C-IX.3 Summary of the Ambient Dosimetry Program for Byron Nuclear Generating Station, 2010.

Figures Figure C-1 Surface Water - Gross Beta - Stations BY-12 and BY-29 (C) Collected in the Vicinity of BNGS, 2000 - 2010.

Figure C-2 Surface Water - Tritium - Stations BY-12 and BY-29 (C) Collected in the Vicinity of BNGS, 2000 - 2010.

Figure C-3 Ground Water - Tritium - Stations BY-14-1 and BY-18 Collected in the Vicinity of BNGS, 2000 - 2010.

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Figure C-4 Ground Water - Tritium - Stations BY-1 8-1 Collected in the Vicinity of BNGS, 2010.

Figure C-5 Ground Water - Tritium - Station BY-32 Collected in the Vicinity of BNGS, 2000 - 2010.

Figure C-6 Ground Water - Tritium - Station BY-35 and BY-36 Collected in the Vicinity of BNGS, 2006 - 2010.

Figure C-7 Ground Water - Tritium - Station BY-37 Collected in the Vicinity of BNGS, 2006 - 2010.

Figure C-8 Air Particulate - Gross Beta - Stations BY-08 (C) and BY-21 Collected in the Vicinity of BNGS, 2000 - 2010.

Figure C-9 Air Particulate - Gross Beta - Stations BY-22 and BY-23 Collected in the Vicinity of BNGS, 2000 - 2010.

Figure C-10 Air Particulate - Gross Beta - Station BY-24 Collected in the Vicinity of BNGS, 2000 - 2010.

Figure C-11 Air Particulate - Gross Beta - Station BY-01 and BY-04 Collected in the Vicinity of BNGS, 2005 - 2010.

Figure C-12 Air Particulate - Gross Beta - Station BY-06 Collected in the Vicinity of BNGS, 2005 - 2010.

Appendix D Inter-Laboratory Comparison Program Tables Table D-1 Analytics Environmental Radioactivity Cross Check Program Teledyne Brown Engineering, 2010 Table D-2 ERA Environmental Radioactivity Cross Check Program Teledyne Brown Engineering, 2010 Table D-3 DOE's Mixed Analyte Performance Evaluation Program (MAPEP)

Teledyne Brown Engineering, 2010 Appendix E Effluent Report Appendix E-1 Data Tables and Figures Appendix F Meteorological Data

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Appendix G Annual Radiological Groundwater Protection Program Report (ARGPPR) 7 of 208

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I. 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 2010 through 31 December 2010. During that time period, 1,454 analyses were performed on 1,315 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. Tritium detected in downstream surface water was well below reportable limits and consistent with expected levels as a result of permitted liquid discharges.

Fish (commercially and/or recreationally important species) and sediment samples were analyzed for concentrations of gamma emitting nuclides. Non-plant produced Cesium-1 37 activity was found at one sediment location 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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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 codes of federal regulations.

This report covers those analyses performed by Teledyne Brown Engineering (TBE) and Global Dosimetry on samples collected during the period 1 January 2010 through 31 December 2010.

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

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

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

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

1. Identifying significant exposure pathways.

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

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

II1. Program Description A. Sample Collection Samples for the BNGS REMP were collected for Exelon Nuclear by Environmental Inc. (Midwest Labs). This section describes the general collection methods used by Environmental Inc. to obtain environmental 11 of 208

samples for the BNGS REMP in 2010. Sample locations and descriptions can be found in Table B-1 and Figures B-1 through B-4, Appendix B.

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

Two gallon water samples were collected weekly from two surface water locations (BY-12 and BY-29 [Control location]) and quarterly from six ground water locations (BY-1 4-1, BY-1 8-1, BY-32, BY-35, BY-36 and BY-37). All samples were collected in new unused plastic bottles, which were rinsed with source water prior to collection. Fish samples comprising the flesh of channel catfish, freshwater drum, golden redhorse, quillback, shorthead redhorse and common carp were collected semiannually at two locations, BY-29 (control) and BY-31. Sediment samples composed of recently deposited substrate were collected at two locations semiannually, BY-12 and BY-34 (control).

Atmospheric Environment The atmospheric environment was evaluated by performing radiological analyses on samples of air particulate, 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 releases.

An outer ring consisting of 16 locations (BY-201, BY-202, BY-203, BY-204, BY-205, BY-206, BY-207, BY-208, BY-209, BY-210, BY-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 seven locations (BY-301-1, BY-302-1, BY-309-1, BY-309-2, BY-309-3, BY-309-4 and BY-314-1) to measure possible exposures from on-site storage facilities.

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

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

The specific 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 13 of 208

sent to Global Dosimetry for analysis.

B. Sample Analysis This section describes the general analytical methodologies used by TBE to analyze the environmental samples for radioactivity for the BNGS REMP in 2010. The analytical procedures used by the laboratory are listed in Table B-2.

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

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

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

3. Concentrations of tritium in ground and surface water.

4. Concentrations of 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.

The minimum detectable concentration (MDC) is defined above 14 of 208

with the exception that the measurement is an after-the-fact estimate of the presence of activity.

2. Net Activity Calculation and Reportingq 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 and milk eleven nuclides, Mn-54, Co-58, Fe-59, Co-60, Zn-65, Nb-95, Zr-95, Cs-134, Cs-137, Ba-140 and La-140 were reported.

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

D. Program Exceptions For 2010 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-21 01/26/10 Low timer reading due to power outage from line repair SW BY-12 03/30/10 First quarter tritium composite was greater than LLD due to weekly sample obtained on 3/16 directly after liquid release 15 of 208

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

Sample Location Collection Reason Type Code Date A/I BY-01 04/13/1 0 Timer not functioning; estimated time and replaced 0 Sediment sample unobtainable in May due to S BY-12, BY-34 05/25/1 high river conditions; collected in June A/I BY-06 06/01/1 0 Vacuum gauge broken; replaced and checked TLD BY-22-1 06/01/1 0 TLD damaged and was replaced with spare S BY-12 06/01/1 0 Cs-137 sediment sample greater was than LLD due to background A/I BY-06 06/22/1 0 Timer would not reset; replaced SW BY-12 06/29/1 0 Second quarter tritium composite was greater than LLD due to weekly sample obtained on 4/6 directly after liquid release A/I BY-06 08/03/1 0 Timer not functioning; estimated time and replaced A/I BY-23, BY-24 08/03/1 0 Low timer reading due to power outage from storms SW BY-12 11/30/1 0 Fourth quarter tritium composite was greater than LLD due to weekly sample obtained on 11/2 directly after liquid release Table D-2 LISTING OF MISSED SAMPLES Sample Locatiorn Collection Reason Type Code Date SW BY-12, BY-29 01/05/1 0 Sample unobtainable due to ice on river SW BY-12, BY-29 01/12/1 0 Sample unobtainable due to ice on river GW BY-18 01/12/1 0 No sample; house for sale and vacant with water turned off SW BY-12, BY-29 01/19/10 Sample unobtainable due to ice on river SW BY-29 01/26/10 Sample unobtainable due to ice on river SW BY-12, BY-29 02/02/10 Sample unobtainable due to ice on river 16 of 208

Table D-2 LISTING OF MISSED SAMPLES (cont'd)

Sample Location Collection Reason Type Code Date SW BY-29 02/08/10 Sample unobtainable due to ice on river SW BY-29 02/16/10 Sample unobtainable due to ice on river SW BY-29 02/23/10 Sample unobtainable due to ice on river GW BY-18 04/13/10 No sample; house for sale and vacant with water turned off TLD BY-103-2 06/29/10 TLD missing upon exchange, replaced with new quarter TLD GW BY-18 07/13/10 No sample; house for sale and vacant with water turned off SW BY-12, BY-29 12/07/10 Sample unobtainable due to ice on river SW BY-12, BY-29 12/14/10 Sample unobtainable due to ice on river SW BY-12, BY-29 12/21/10 Sample unobtainable due to ice on river SW BY-12, BY-29 12/28/10 Sample unobtainable due to 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.

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

E. Program Changes Groundwater sample location BY-1 8 was replaced with BY-1 8-1 in July 2010.

While working on changes to the REMP sample location tables for an upcoming ODCM revision, it was discovered that seven outer ring TLD locations were outside of the 3.7 - 5.0 mile (6-8 km) range required per plant specifications. In recent years, more precise measurements to the vent stack release point and REMP sample locations have been made using GPS. The existing distances were within 1/4 mile of the required distances and would generally lie within expected uncertainty based on historical location methods. On 12/29/10, TLD locations for BY-202-1, 17 of 208

BY-207-2, BY-208-2, BY-209-1, BY-209-4, BY-215-1, and BY-215-4 were relocated to meet the appropriate sector/distance requirements. The new distance and directions are reflected in Table B-I.

IV. Results and Discussion A. Aquatic Environment

1. Surface Water Samples were taken weekly and composited monthly at two locations (BY-12 and BY-29). Of these locations only BY-12 located downstream, could be affected by Byron 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 3.3 to 7.5 pCi/l. Concentrations detected were consistent with those detected in previous years (Figure C-1, Appendix C).

Tritium Quarterly composites of weekly collections were analyzed for tritium activity (Table C-1.2, Appendix C). Tritium was detected in three samples. The concentration ranged from 2050 to 3830 pCi/L (Figure C-2, Appendix C). Tritium detected in downstream surface water was well below reportable limits and consistent with expected levels as a result of permitted liquid discharges.

Gamma Spectrometry 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-18-1, 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:

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Tritium Quarterly grab samples from the locations were analyzed for tritium activity (Table C-I1.1, Appendix C). No tritium was detected, and the required LLD was met (Figures C-3 through 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 channel catfish, freshwater drum, golden redhorse, quillback, shorthead redhorse 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. BY-12, located downstream, 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 at one location. The values ranged from 90 to 181 pCi/kg dry. Concentrations detected were consistent with those detected in previous years and are not a result of plant effluents. No other nuclides were detected, and all required LLDs were met.

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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 6 to 36 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 6 to 37 E-3 pCi/m 3 with a mean of 18 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 18 E-3 pCi/m 3 . Comparison of the 2010 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 2010 indicate no notable differences among the three groups (Figures C-7 through C-1 1, Appendix C).

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

b. Airborne Iodine Continuous air samples were collected from eight locations (BY-01, BY-04, BY-06, BY-08, BY-21, BY-22, BY-23, and BY-24) and analyzed weekly for 1-131 (Table C-VI.1, Appendix C). No 1-131 was detected and the required LLD was met.

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2. Terrestrial

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

Iodine-1 31 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:

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. Ninety-one 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 quarter, with a range of 16 to 33 mR/standard quarter. A comparison of the Inner Ring, 21 of 208

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 2010 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, livestock, and milk producing animals in each of the sixteen 22 1/2 degree sectors and garden of greater than 500 square feet in each of the four 90 degree quadrants around the site. The results of this survey are summarized below.

Distance in Miles from the BNGS Vent Stacks Sector Residence Livestock Milk Farm Miles Miles Miles A N 1.2 5.2 12.0 B NNE 1.6 1.5 C NE 1.1 3.0 D ENE 1.4 4.2 E E 1.2 3.8 F ESE 1.5 1.3 G SE 1.7 4.3 H SSE 0.7 3.2 J S 0.6 0.6 K SSW 0.7 2.3 L SW 0.8 1.6 M WSW 1.6 1.6 4.5 N W 1.8 3.2 P WNW 1.6 5.8 Q NW 0.8 3.7 R NNW 0.9 1.4 5.0 E. Errata Data 2002-2009 Errata Portions of the Annual Radiological Effluent Operating Reports (AREOR) from 2002-2009 were over-reporting quarterly and annual dose data.

Each year, reports entitled "40CFR190 Uranium Fuel Cycle Dose Report" were being generated to provide annual dose summaries. These reports were being generated twice - once each for Unit 1 and Unit 2. It was recently understood that these reports automatically sum the dose from both units, thus reports on a per-unit basis are not appropriate. As a result, the 40CFR1 90 reports contained within the 2002-2009 AREORs were over-reporting associated dose estimates by a factor of two. Thus, 22 of 208

the 40CFR190 dose estimates reported between 2002 and 2009 should have been a total from both Unit 1 and Unit 2, and should have been exactly half of the total dose after adding Unit 1 and Unit 2 dose together.

The error occurred due a misinterpretation of the reports provided by new dose calculation software introduced in 2002. The error continued to be carried forward in subsequent years through program responsibility changes and employee turnover.

2009 Errata The 2009 AREOR contains two typographical errors on Page 111 of 207.

In the Effluent Waste Disposal Report, Table 1A, Gaseous Effluents -

Summation of all Releases, Reg Guide 1.21 - Unit 2, the total release (Ci) of fission and activation gases for the 3rd and 4th quarter of 2009 are listed as 2.33E-02 and 1.07E-02, respectively. The correct values are 2.33E-01 and 1.07E-01, respectively.

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 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.

23 of 208

3. DOE Evaluation Criteria MAPEP's evaluation report provides an acceptance range with associated flag values.

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

For the primary laboratory, 16 out of 18 analytes met the specified acceptance criteria. Two analytes did not meet the specified acceptance criteria for the following reason:

1. Teledyne Brown Engineering's ERA November 2010 Sr-89 in water result of 77.8 pCi/L was higher than the known value of 68.5 pCi/L, resulting in a found to known ratio of 1.14. NCR 10-09 was initiated to investigate this failure. Since the ratio of 1.14 fell within an acceptance range of 20%, Teledyne considers this an acceptable result.

2. Teledyne Brown Engineering's ERA November 2010 Zn-65 in water result of 11.0 pCi/L was lower than the known value of 102 pCi/L. NCR 10-09 was initiated to investigate this failure. The Zn-65 result of 111 was incorrectly reported as 11.0.

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

24 of 208

APPENDIX A RADIOLOGICAL ENVIRONMENTAL MONITORING REPORT

SUMMARY

25 of 208

26 of 208 TABLE A-i RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANNUAL

SUMMARY

FOR BYRON NUCLEAR GENERATION STATION, 2010 Name of Facility: BYRON DOCKET NUMBER: 50-454 & 50-455 Location of Facility: BYRON, IL REPORTING PERIOD: 2010 INDICATOR CONTROL LOCATION WITH HIGHEST ANNUAL MEAN (M)

LOCATIONS LOCATION MEDIUM OR TYPES OF NUMBER OF REQUIRED MEAN (M) MEAN (M) MEAN (M) STATION # NUMBER OF PATHWAY SAMPLED ANALYSIS ANALYSIS LOWER LIMIT (F) (F) (F) NAME NONROUTINE (UNIT OF PERFORMED PERFORMED OF DETECTION RANGE RANGE RANGE DISTANCE AND DIRECTION REPORTED MEASUREMENT) (LLD) MEASUREMENTS SURFACE WATER GR-B 20 4 4.8 4.4 4.8 BY-12 INDICATOR 0 (PCI/LITER) (8/11) (5/9) (8/11) OREGON POOL OF ROCK RIVER - DOWNSTREAM (3.6/7.5) (3.3/5.1) (3.6/7.5) 4.5 MILES SSW OF SITE H-3 200 2687 <LLD 2687 BY- 12 INDICATOR 3 (3/4) (3/4) OREGON POOL OF ROCK RIVER - DOWNSTREAM (2050/3830) (2050/3830) 4.5 MILES SSW OF SITE GAMMA 20 MN-54 15 <LLD <LLD 0 CO-58 15 <LLD <LLD 0 FE-59 30 <LLD <LLD 0 CO-60 15 <LLD <LLD 0 0

O0 ZN-65 30 <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-I RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANNUAL

SUMMARY

FOR BYRON NUCLEAR GENERATION STATION, 2010 Name of Facility: BYRON DOCKET NUMBER: 50-454 & 50-455 Location of Facility: BYRON, IL REPORTING PERIOD: 2010 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 NB-95 15 <LLD <LLD 0 (PCI/LITER)

ZR-95 30 <LLD <LLD 0 1-131 15 <LLD <LLD 0 CS-134 15 <LLD <LLD 0 CS-137 18 <LLD <LLD 0 BA-140 60 <LLD <LLD 0 00 0

LA- 140 15 <LLD <LLD 0 00

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, 2010 Name of Facility: BYRON DOCKET NUMBER: 50-454 & 50-455 Location of Facility: BYRON, IL REPORTING PERIOD: 2010 INDICATOR CONTROL LOCATION WITH HIGHEST ANNUAL MEAN (M)

LOCATIONS LOCATION MEDIUM OR TYPES OF NUMBER OF REQUIRED MEAN (M) MEAN (M) MEAN (M) STATION # NUMBER OF PATHWAY SAMPLED ANALYSIS ANALYSIS LOWER LIMIT (F) (F) (F) NAME NONROUTINE (UNIT OF PERFORMED PERFORMED OF DETECTION RANGE RANGE RANGE DISTANCE AND DIRECTION REPORTED MEASUREMENT) (LLD) MEASUREMENTS GROUND WATER H-3 22 200 <LLD NA 0 (PCI/LITER)

GAMMA 22 MN-54 15 <LLD NA CO-58 15 <LLD NA 0 FE-59 30 <LLD NA 0 CO-60 15 <LLD NA 0

"',a ZN-65 30 <LLD NA 0 0

toa NB-95 15 <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, 2010 Name of Facility: BYRON DOCKET NUMBER: 50-454 & 50-455 Location of Facility: BYRON, IL REPORTING PERIOD: 2010 INDICATOR CONTROL LOCATION WITH HIGHEST ANNUAL MEAN (NI)

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 ZR-95 30 <LLD NA 0 (PCI/LITER) 1-131 15 <LLD NA 0 CS-134 15 <LLD NA 0 CS-137 18 <LLD NA 0 BA-140 60 <LLD NA 0 LA-140 15 <LLD NA 0 0

FISH GAMMA 8 00 (PCI/KG WET) MN-54 130 <LLD <LLD 0

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

TABLE A-i RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANNUAL

SUMMARY

FOR BYRON NUCLEAR GENERATION STATION, 2010 Name of Facility: BYRON DOCKET NUMBER: 50-454 & 50-455 Location of Facility: BYRON, IL REPORTING PERIOD: 2010 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 CO-58 130 <LLD <LLD 0 (PCI/KG WET)

Lu FE-59 260 <LLD <LLD 0 CO-60 130 <LLD <LLD 0 ZN-65 260 <LLD <LLD 0 NB-95 NA <LLD <LLD 0 ZR-95 NA <LLD <LLD 0 0

t0 CS-134 130 <LLD <LLD 0

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

TABLE A-1 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANNUAL

SUMMARY

FOR BYRON NUCLEAR GENERATION STATION, 2010 Name of Facility: BYRON DOCKET NUMBER: 50-454 & 50-455 Location of Facility: BYRON, IL REPORTING PERIOD: 2010 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 CS-137 150 <LLD <LLD 0 (PCI/KG WET)

BA-140 NA <LLD <LLD 0 LA-140 NA <LLD <LLD 0 SEDIMENT GAMMA 4 (PCI/KG DRY) MN-54 NA <LLD NA 0 CO-58 NA <LLD NA 0 t',J FE-59 NA <LLD NA 0 0

0t 00 CO-60 NA <LLD NA 0

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

TABLE A-i RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANNUAL

SUMMARY

FOR BYRON NUCLEAR GENERATION STATION, 2010 Name of Facility: BYRON DOCKET NUMBER: 50-454 & 50-455 Location of Facility: BYRON, IL REPORTING PERIOD: 2010 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 ZN-65 NA <LLD NA 0 (PCI/KG DRY)

NB-95 NA <LLD NA 0 ZR-95 NA <LLD NA 0 CS-134 150 <LLD NA 0 CS-137 180 136 <LLD 136 BY-12 INDICATOR 0 (2/2) (2/2) OREGON POOL OF ROCK RIVER - DOWNSTREAM (90/181) (90/181) 4.5 MILES SSW OF SITE BA-140 NA <LLD NA 0 0

N)

C LA-140 NA <LLD NA 0

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

TABLE A-1 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANNUAL

SUMMARY

FOR BYRON NUCLEAR GENERATION STATION, 2010 Name of Facility: BYRON DOCKET NUMBER: 50-454 & 50-455 Location of Facility: BYRON, IL REPORTING PERIOD: 2010 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 GR-B 416 10 19 18 19 BY-23 INDICATOR 0 (E-3 PCI/CU.METER) (361/364) (52/52) (52/52) BYRON NEARSITE SOUTH (6/37) (8/37) (7/36) 0.6 MILES S OF SITE 80 GAMMA 32 MN-54 NA <LLD <LLD 0 CO-58 NA <LLD <LLD 0 FE-59 NA <LLD <LLD 0 CO-60 NA <LLD <LLD 0 ZN-65 NA <LLD <LLD 0 0:

0 00.

NB-95 NA <LLD <LLD 0

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

TABLE A-1 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANNUAL

SUMMARY

FOR BYRON NUCLEAR GENERATION STATION, 2010 Name of Facility: BYRON DOCKET NUMBER: 50-454 & 50-455 Location of Facility: BYRON, IL REPORTING PERIOD: 2010 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 NA <LLD <LLD 0 (E-3 PCIICU.METER)

CS-134 150 <LLD <LLD 0 CS-137 180 <LLD <LLD 0 BA-140 NA <LLD <LLD 0 LA-140 NA <LLD <LLD 0 AIR IODINE GAMMA 416 (A (E-3 PCI/CU.METER) 1-131 70 <LLD <LLD 0 0*

0 00, MILK 1-131 57 1 <LLD <LLD 0 (PCI/LITER)

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, 2010 Name of Facility: BYRON DOCKET NUMBER: 50-454 & 50-455 Location of Facility: BYRON, IL REPORTING PERIOD: 2010 INDICATOR CONTROL LOCATION WITH HIGHEST ANNUAL MEAN (NI)

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 GAMMA 57 (PCI/LITER) MN-54 NA <LLD <LLD 0 0

CO-58 NA <LLD <LLD 0 FE-59 NA <LLD <LLD 0 CO-60 NA <LLD <LLD 0 ZN-65 NA <LLD <LLD 0 NB-95 NA <LLD <LLD 0 0

t0 00 ZR-95 NA <LLD <LLD 0

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

TABLE A-1 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANNUAL

SUMMARY

FOR BYRON NUCLEAR GENERATION STATION, 2010 Name of Facility: BYRON DOCKET NUMBER: 50-454 & 50-455 Location of Facility: BYRON, IL REPORTING PERIOD: 2010 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 CS-134 15 <LLD <LLD 0 (PCI/LITER)

CS-137 18 <LLD <LLD 0 BA-140 60 <LLD <LLD 0 LA- 140 15 <LLD <LLD 0 VEGETATION GAMMA 10 (PCI/KG WET) MN-54 NA <LLD <LLD 0 CO-58 NA <LLD <LLD 0 0

0t 00 FE-59 NA <LLD <LLD 0

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

TABLE A-i RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANNUAL

SUMMARY

FOR BYRON NUCLEAR GENERATION STATION, 2010 Name of Facility: BYRON DOCKET NUMBER: 50-454 & 50-455 Location of Facility: BYRON, IL REPORTING PERIOD: 2010 INDICATOR CONTROL LOCATION WITH HIGHEST ANNUAL MEAN (M)

LOCATIONS LOCATION MEDIUM OR TYPES OF NUMBER OF REQUIRED MEAN (M) MEAN (M) MEAN (M) STATION # NUMBER OF PATHWAY SAMPLED ANALYSIS ANALYSIS LOWER LIMIT (F) (F) (F) NAME NONROUTINE (UNIT OF PERFORMED PERFORMED OF DETECTION RANGE RANGE RANGE DISTANCE AND DIRECTION REPORTED MEASUREMENT) (LLD) MEASUREMENTS VEGETATION CO-60 NA <LLD <LLD 0 (PCI/KG WET)

ZN-65 NA <LLD <LLD 0 NB-95 NA <LLD <LLD 0 ZR-95 NA <LLD <LLD 0 1-131 60 <LLD <LLD 0 CS-134 60 <LLD <LLD 0 w

00 00 CS-137 80 <LLD <LLD 0 00

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, 2010 Name of Facility: BYRON DOCKET NUMBER: 50-454 & 50-455 Location of Facility: BYRON, IL REPORTING PERIOD: 2010 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 BA- 140 NA <LLD <LLD 0 (PCI/KG WET)

LA-140 NA <LLD <LLD 0 DIRECT RADIATION TLD-QUARTERLY 363 NA 24.2 21.6 28.3 BY-103-2 INDICATOR 0 (MILLI-ROENTGEN/QTR.) (355/355) (8/8) (3/3)

(16/33) (17/27) (23/33) 1.7 MILES NE 00 00

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)

Intentionally left blank 40 of 208

APPENDIX B LOCATION DESIGNATION, DISTANCE & DIRECTION, AND SAMPLE COLLECTION & ANALYTICAL METHODS 41 of 208

42 of 208 TABLE B-1: Radiological Environmental Monitoring Program - Sampling Locations, Distance and Direction, Byron Nuclear Generating Station, 2010 Location Location Description Distance & Direction From Site A. Surface Water BY-12 Oregon Pool of Rock River, Downstream 4.5 miles SSW BY-29 Byron, Upstream (control) 3.0 miles N B. Ground/Well Water BY-14-1 3200 North German Church Road 1.0 miles SSE BY-18-1 Calhoun 0.7 miles SSW BY-32 Ron Wolford Well 1.9 miles W BY-35 Vancko Well 1.9 miles WNW BY-36 Blanchard Well 0.8 miles NW BY-37 Alexander Well 2.0 miles WNW C. Milk BY-20-1 Ron Snodgrass Farm 4.9 miles WSW BY-26-1 Dennis Herbert (control) 12.8 miles N BY-30-1 Ebert Farm 5.3 miles NNW D. Air Particulates / Air Iodine BY-01 Byron 3.0 miles N BY-04 Paynes Point 5.0 miles SE BY-06 Oregon 4.7 miles SSW BY-08 Leaf River (control) 7.0 miles WNW BY-21 Byron Nearsite North 0.3 miles N BY-22 Byron Nearsite East-Southeast 0.4 miles SE BY-23 Byron Nearsite South 0.6 miles S BY-24 Byron Nearsite Southwest 0.7 miles SW E. Fish BY-29 Byron, Upstream (control) 3.0 miles N BY-31 Byron, Discharge 2.6 miles WNW F. Sediment BY-12 Oregon Pool of Rock River, Downstream 4.6 miles SSW BY-34 Rock River, Upstream of Discharge (control) 2.6 miles WNW G. Veqetation Quadrant 1 5186 N. Cox Road, Stillman Valley 4.8 miles ENE Quadrant 2 6274 Brick Road, Oregon 4.7 miles SE Quadrant 3 2002 Deer Path Rd., Byron 0.9 miles SW Quadrant 4 722 Town Line Rd., Leaf River 4.5 miles NW Control 5631 Fair Oak Rd., Davis Junction 12.6 miles E H. Environmental Dosimetry - TLD Inner Ring BY-101-1 and -2 0.3 miles N BY-102-1 1.0 miles NNE BY-102-2 1.0 miles NNE B-1 43 of 208

TABLE B-i: Radiological Environmental Monitoring Program - Sampling Locations, Distance and Direction, Byron Nuclear Generating Station, 2010 Location Location Description Distance & Direction From Site BY-103-1 and -2 1.7 miles NE BY- 103-3 0.4 miles NE BY-104-1 and -2 1.4 miles ENE BY-104-3 0.3 miles ENE BY-105-1 and -2 1.3 miles E BY-106-1 and -2 1.4 miles ESE BY-107-1 and -2 1.4 miles SE BY-107-3 0.4 miles SE BY-108-1 0.7 miles SSE BY-108-2 0.6 miles SSE BY-109-1 and -2 0.6 miles S BY-110-1 and -2 0.7 miles SSW BY-111-3 0.8 miles SW BY-111-4 0.9 miles SW BY-112-3 and -4 0.8 miles WSW BY-113-1 and -2 0.7 miles W BY-114-1 and -2 0.8 miles WNW BY-1 15-1 and -2 1.0 miles NW BY-1 16-1 and -2 1.4 miles NNW BY-1 16-3 0.9 miles NNW Outer Ring BY-201-3 4.4 miles N BY-201-4 4.4 miles N BY-202-1 4.4 miles NNE BY-202-2 4.8 miles NNE BY-203-1 4.8 miles NE BY-203-2 4.7 miles NE BY-204-1 4.1 miles ENE BY-204-2 4.0 miles ENE BY-205-1 and -2 3.8 miles E BY-206-1 4.0 miles ESE BY-206-2 4.3 miles ESE BY-207-1 4.2 miles SE BY-207-2 3.9 miles SE BY-208-1 4.0 miles SSE BY-208-2 3.8 miles SSE BY-209-1 and -4 4.0 miles S BY-210-3 and -4 3.9 miles SSW BY-211-1 and -4 4.9 miles SW BY-212-1 and -4 4.7 miles WSW BY-213-1 4.7 miles W BY-213-4 4.7 miles W BY-214-1 4.7 miles WNW BY-214-4 4.6 miles WNW BY-215-1 4.2 miles NW BY-215-4 4.2 miles NW BY-216-1 4.5 miles NNW BY-216-2 4.7 miles NNW B-2 44 of 208

TABLE B-1: Radiological Environmental Monitoring Program - Sampling Locations, Distance and Direction, Byron Nuclear Generating Station, 2010 Location Location Description Distance & Direction From Site Special Interest BY-301-1 0.3 miles N BY-302-1 0.1 miles NNE BY-309-1 0.3 miles S BY-309-2 0.4 miles S BY-309-3 0.4 miles S BY-309-4 0.4 miles SSW BY-314-1 0.3 miles WNW Other BY-01-1 and -2 3.0 miles N BY-04-1 and -2 5.0 miles SE BY-06-1 and -2 4.7 miles SSW BY-21-1 and -2 0.3 miles N BY-22-1 and -2 0.4 miles SE BY-23-1 and -2 0.6 miles S BY-24-1 and -2 0.7 miles SW Control BY-08-1 and -2 7.0 miles WNW B-3 45 of 208

TABLE B-2: Radiological Environmental Monitoring Program - Summary of Sample Collection and Analytical Methods, Byron Nuclear Generating Station, 2010 Sample Analysis Sampling Method Analytical Procedure Number Medium Surface Water Gamma Spectroscopy Monthly composite from TBE, TBE-2007 Gamma emitting radioisotope analysis weekly grab samples.

Surface Water Gross Beta Monthly composite from TBE, TBE-2008 Gross Alpha and/or gross beta activity in weekly grab samples. various matrices Surface Water Tritium Quarterly composite TBE, TBE-2011 Tritium analysis in drinking water by liquid from weekly grab scintillation samples.

Ground Water Gamma Spectroscopy Quarterly grab samples. TBE, TBE-2007 Gamma emitting radioisotope analysis Ground Water Tritium Quarterly grab samples. TBE, TBE-2011 Tritium analysis in drinking water by liquid scintillation Fish Gamma Spectroscopy Semi-annual samples TBE-2007 Gamma emitting radioisotope analysis collected via electroshocking or other techniques Sediment Gamma Spectroscopy Semi-annual grab TBE, TBE-2007 Gamma emitting radioisotope analysis samples Air Particulates Gross Beta One-week composite of TBE, TBE-2008 Gross Alpha and/or gross beta activity in continuous air sampling various matrices through glass fiber filter paper Air Particulates Gamma Spectroscopy Quarterly composite of TBE, TBE-2007 Gamma emitting radioisotope analysis each station Air Iodine Gamma Spectroscopy One-week composite of TBE, TBE-2007 Gamma emitting radioisotope analysis continuous air sampling through charcoal filter Milk 1-131 Bi-weekly grab sample TBE, TBE-2012 Radioiodine in various matrices when cows are on pasture. Monthly all other times Milk Gamma Spectroscopy Bi-weekly grab sample TBE, TBE-2007 Gamma emitting radioisotope analysis when cows are on pasture. Monthly all other times Vegetation Gamma Spectroscopy Annual grab samples. TBE, TBE-2007 Gamma emitting radioisotope analysis TLD Thermoluminescence Quarterly TLDs Mirion Technologies Dosimetry comprised of two Mirion Techologies CaF 2 elements.

B-4 46 of 208

Figure B-1 Inner and Outer Ring TLD Locations of the Byron Nuclear Generating Station, 2010 B-5 47 of 208

i*!¸*,

-1/2 rIr nL.'*

E:

0I ln Y Q.,

IE , Figure B-2 .

TOPOGRAPIC*i MNUTS rI L*tios of the

*U,,* -,,,,*,,, Byron Nuclear Generating**cStation, 201

`***!`*!**

LMW&ATEU EOLOUDUUREY ByonsiteairSamplaingLocations of0th B-6 48 of 208

BYRON frt.72 LEAF mOVm M.

MURSI IRD O0EON 0 1 2 3 4 MILES a at 4 H I ID KidS

Air Swipling Loc'tzkm

Brnlmion Figure B-3 Offsite Air Sampling Locations of the Byron Nuclear Generating Station, 2010 B-7 49 of 208

OFFSITE DOSE CALCULATION MANUAL 0 FISH BYRON STATION 1i MILK FIGURE 64 o SEDIMENT

+ WATER INGFSTION AND WATERBORNE EXPOSURE

!1 BYRON STATrON PATHWAY SAMPLE LOCATIONS o PLANT UQUID DISCHARGE Figure B-4 Ingestion and Waterborne Exposure Pathway Sampling Locations of the Byron Nuclear Generating Station, 2010 B-8 50 of 208

APPENDIX C DATA TABLES AND FIGURES PRIMARY LABORATORY 51 of 208

52 of 208 TABLE C-1.1 CONCENTRATIONS OF GROSS BETA IN SURFACE WATER SAMPLES COLLECTED IN THE VICINITY OF BYRON NUCLEAR GENERATING STATION, 2010 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION BY-12 BY-29 PERIOD 01/26/10 - 01/26/10 < 2.9 (1) (1) 02/08/10 - 02/23/10 4.7 +/- 1.4 (1) (1) 03/02/10 - 03/30/10 5.1 +/- 3.1 < 3.0 04/06/10 - 04/27/10 < 3.5 4.0 +/- 2.4 05/04/10 - 05/25/10 4.7 +/- 2.1 5.0 +/- 2.2 06/01/10 - 06/29/10 4.8 +/- 2.5 < 3.4 07/06/10 - 07/27/10 3.6 +/- 2.3 < 3.3 08/03/10 - 08/31/10 7.5 +/- 2.2 5.1 +/- 2.0 09/07/10 - 09/28/10 4.0 +/- 2.0 4.8 +/- 2.2 10/05/10 - 10/26/10 < 2.8 < 2.8 11/02/10 - 11/30/10 4.0 +/- 2.0 3.3 +/- 1.9 12/01/10 - 12/30/10 (1) (1)

MEAN 4.8 +/- 2.4 4.4 +/- 1.6 TABLE C-1.2 CONCENTRATIONS OF TRITIUM IN SURFACE WATER SAMPLES COLLECTED IN THE VICINITY OF BYRON NUCLEAR GENERATING STATION, 2010 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION BY-12 BY-29 PERIOD 01/26/10 - 03/30/10 2180 +/- 262 (1) < 176 (1) 04/06/10 - 06/29/10 2050 +/- 256 (1) < 169 (1) 07/06/10 - 09/28/10 < 188 < 193 10/05/10 - 11/30/10 3830 +/- 435 (1) < 168 (1)

MEAN 2687 +/- 1985

THE MEAN AND 2 STANDARD DEVIATION VALUES ARE CALCULATED USING THE POSITIVE VALUES (1) SEE PROGRAM EXCEPTIONS SECTION FOR EXPLANATION C-I 53 of 208

TABLE C-1.3 CONCENTRATIONS OF GAMMA EMITTERS IN SURFACE WATER SAMPLES COLLECTED IN THE VICINITY OF BYRON NUCLEAR GENERATING STATION, 2010 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 01/26/10 - 01/26/ 10 (1) <4 <5 < 11 <6 < 10 <6 <8 < 12 <5 <6 < 25 <8 02/08/10 - 02/23/ 10 (1) <3 <3 <6 <3 <5 <3 <5 < 15 <2 <3 < 25 <7 03/02/10 - 03/30110 <1 <1 <3 <1 <3 <2 <3 < 10 <1 <1 < 15 <5 04/06/10 - 04/27/ 10 <2 <2 <4 <2 <3 <2 <3 < 15 <2 <2 < 21 <7 05/04/10 - 05/25/ 10 <1 <1 <3 <1 <2 <2 <3 < 13 <1 <1 < 18 <6 06/01/10 - 06/29/ 10 <2 <3 <6 <2 <4 <3 <5 < 14 <2 <2 < 24 <9 07/06/10 - 07/27/ 10 <2 <2 <5 <2 <4 <2 <4 <9 <2 <2 < 18 <6 08/03/10 - 08/31/ 10 <2 <2 <4 <2 <4 <2 <4 < 14 <2 <2 < 21 <7 09/07/10 - 09/28/ 10 <1 <2 <4 <1 <3 <2 <3 < 14 <1 <1 < 22 <7 10/05/10 - 10/26/ 10 <2 <2 <4 <2 <4 <2 <4 <8 <2 <2 < 16 <5 11/02/10 - 11/30/ 10 <1 <1 <2 <1 <2 <1 <2 <9 <1 <1 < 12 <3 12/01/10 - 12/30/ 10 (1)

MEAN BY-29 01/26/10 - 01/26/10 (1) 02/08/10 - 02/23/10 (1) 03/02/10 - 03/30/10 <2 <2 <5 <2 <2 <2 <4 < 13 <2 <2 < 21 <7 04/06/10 - 04/27/10 <1 <2 <4 <1 <3 <2 <3 < 13 <1 <1 < 20 <6 05/04/10 - 05/25/10 <1 <1 <3 <1 <3 <1 <2 < 12 <1 <1 < 18 <5 06/01/10 - 06/29/10 <2 <2 <5 <2 <4 <2 <4 < 14 <2 <2 < 22 <7 07/06/10 - 07/27/10 <2 <3 <6 <2 <6 <3 <5 < 10 <3 <3 < 21 <7 08/03/10 - 08/31/10 <2 <2 <4 <2 <3 <2 <3 < 12 <2 <2 < 19 <6 09/07/10 - 09/28/10 <1 <2 <3 <1 <3 <1 <3 < 13 <1 <1 < 18 <6 10/05/10 - 10/26/10 <2 <2 <5 <2 <4 <2 <4 < 10 <2 <2 < 17 <6 11/02/10 - 11/30/10 <1 <1 <3 <1 <2 <1 <2 < 11 <1 <1 < 16 <5 12/01/10 - 12/30/10 (1)

MEAN

(-A 0*

00 00 (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, 2010 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION BY-14-1 BY-18 BY-18-1 BY-32 BY-35 BY-36 BY-37 PERIOD 01/12/10 - 01/12/10 < 184 (1) < 185

183

181

182 04/13/10 - 04/13/10 < 157 (1) < 161

160

161

161 07/13/10 - 07/13/10 < 171 (1) < 170 (2) < 169

169

176 < 172 10/12/10 - 10/12/10 < 153 < 154 < 138

143

147 < 148 MEAN (1) SEE PROGRAM EXCEPTIONS SECTION FOR EXPLANATION (2) SEE PROGRAM CHANGES SECTION FOR EXPLANATION C-3 55 of 208

TABLE C-II.2 CONCENTRATIONS OF GAMMA EMITTERS IN GROUND WATER SAMPLES COLLECTED IN THE VICINITY OF BYRON NUCLEAR GENERATING STATION, 2010 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 01/12/10 - 01/12/10 <3 <3 <7 <3 <6 <4 <6 < 10 <3 <3

24 <7 04/13/10 - 04/13/10 <1 <1 <3 <1 <2 <2 <3 <8 <1 <1

14 <4 07/13/10 - 07/13/10 <3 <4 <7 <3 <6 <4 <5 <6 <3 <3

16 <5 10/12/10 - 10/12/10 <6 <7 <13 <7 <11 <8 < 14 <14 <6 <7 < 37 < 11 MEAN BY-18 01/12/10 - 01/12/10 (1) -

04/13/10 - 04/13/10 (1) -

07/13/10 - 07/13/10 (1) -

10/12/10 - 10/12/10 (1) -

MEAN BY-18-1 01/12/10 - 01/12/10 04/13/10 - 04/13/10 -

07/13/10 - 07/13/10 (2) < 7 <8 < 14 < 8 < 19 < 9 < 13 < 13 < 10 <8 < 35 < 11 10/12/10 - 10/12/10 < 7 <7 < 13 < 6 < 14 < 8 < 12 < 15 <6 <7 <40 < 13 MEAN BY-32 01/12/10 - 01/12/10 <4 <4 <9 <4 <8 <5 <7 < 14 <4 <4 < 31 <9 04/13/10 - 04/13/10 <2 <2 <4 <2 <4 <2 <4 < 10 <2 <2 < 19 <7 07/13/10 - 07/13/10 <5 <5 < 10 <5 < 10 <5 <8 <9 <4 <5 < 22 <8 10/12/10 - 10/12/10 <6 <5 < 10 <5 < 11 <7 < 10 < 13 <5 <6 < 28 < 10 MEAN BY-35 01/12/10 - 01/12/10 <3 <3 <8 <3 <7 <4 <7 < 15 <4 <4 < 28 <7 04/13/10 - 04/13/10 <2 <2 <5 <2 <4 <2 <4

12 <2 <2 < 21 <6 07/13/10 - 07/13/10 <5 <6 <11 <6 < 12 <6 <9 < 10 <6 <6 < 28 <7 10/12/10 10/12/10 <5 <5 < 11 <6 < 10 <5 <9

- <6 <8 < 11 <4 < 32 0

0o MEAN 00 (1) SEE PROGRAM EXCEPTIONS SECTION FOR EXPLANATION (2) SEE PROGRAM CHANGES SECTION FOR EXPLANATION

TABLE C-II.2 CONCENTRATIONS OF GAMMA EMITTERS IN GROUND WATER SAMPLES COLLECTED IN THE VICINITY OF BYRON NUCLEAR GENERATING STATION, 2010 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 01/12/10 - 01/12/10 <3 <3 <6 <3 <6 <3 <6 < 13 <3 <3 < 24 <6 04/13/10 - 04/13/10 <2 <2 <5 <2 <4 <2 <4 < 11 <2 <2 < 18 <6 07/13/10 - 07/13/10 <8 <7 < 14 <8 < 17 <9 < 14 < 14 <9 <8 < 36 < 11 10/12/10 - 10/12/10 <3 <3 <6 <3 <5 <3 <5 <7 <3 <3 < 17 <5 MEAN BY-37 01/12/10 - 01/12/10 <3 <3 <6 <3 <6 <3 <6 < 11 <3 <3 < 24 <8 04/13/10 - 04/13/10 <2 <2 <4 <2 <4 <2 <3 < 11 <2 <2 < 18 <6 07/13/10 - 07/13/10 <7 <8 < 13 <7 < 16 <8 < 15 < 13 <8 <9 < 37 < 10 10112/10 - 10/12/10 <6 <6 < 14 <7 < 12 <7 < 10 < 14 <6 <7 < 33 < 10 MEAN t Ji 0

0 00

TABLE C-I11.1 CONCENTRATIONS OF GAMMA EMITTERS IN FISH SAMPLES COLLECTED IN THE VICINITY OF BYRON NUCLEAR GENERATING STATION, 2010 RESULTS IN UNITS OF PCI/KG WET 1 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 Channel Catfish 05/03/10 < 41 < 58 < 126 < 36 < 101 < 52 < 96 < 44 < 51 < 623 < 218 Shorthead Redhorse 05/03/10 < 62 < 58 < 136 < 59 < 85 < 63 < 113 < 41 < 47 < 734 < 206 Freshwater Drum 10/19/10 < 43 < 50 < 122 < 40 < 115 < 51 < 82 < 41 < 50 < 326 < 122 Golden Redhorse 10/19/10 < 51 < 44 < 93 < 58 < 100 < 46 < 104 < 47 < 50 < 392 < 88 MEAN BY-31 Channel Catfish 05/03/10 < 39 < 60 < 126 < 26 < 134 < 67 < 138 < 62 < 55 < 957 < 261 Common Carp 05/03/10 < 53 < 62 < 140 < 48 < 104 < 70 < 92 < 52 < 51 < 825 < 269 Common Carp 10/19/10 < 42 < 52 < 112 < 55 < 107 < 48 <94 < 42 < 56 < 280 < 92 Quillback 10/19/10 < 46 < 60 < 104 < 54 < 100 <64 < 91 < 46 < 53 < 372 < 118 MEAN 00 00 0

00

TABLE C-IV.1 CONCENTRATIONS OF GAMMA EMITTERS IN SEDIMENT SAMPLES COLLECTED INTHE VICINITY OF BYRON NUCLEAR GENERATING STATION, 2010 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-1 34 Cs-137 Ba-140 La-140 PERIOD BY-12 06/01/10 (1) < 97 < 96 < 240 < 87 < 177 < 108 < 182 < 71 181 +/- 76 (1) < 1100 < 320 10/25/10 < 60 < 63 < 132 < 67 < 133 < 63 < 114 < 62 90 +/- 65 (1) < 296 < 67 MEAN 136 +/- 128 BY-34 06101/10 (1) < 55 < 68 < 163 < 52 < 129 < 71 < 117 < 49 < 85 < 911 < 215 10/25/10 < 36 < 35 < 73 < 43 < 69 < 43 < 57 < 33 < 37 < 172 < 56 MEAN C-)

-1

THE MEAN AND 2 STANDARD DEVIATION VALUES ARE CALCULATED USING THE POSITIVE VALUES (1) SEE PROGRAM EXCEPTIONS SECTION FOR EXPLANATION

TABLE C-V.1 CONCENTRATIONS OF GROSS BETA IN AIR PARTICULATE SAMPLES COLLECTED IN THE VICINITY OF BYRON NUCLEAR GENERATING STATION, 2010 RESULTS IN UNITS OF E-3 PCI/CU METER +/- 2 SIGMA COLLECTION GROUP I IGROUP 11 GROUP III PERIOD BY-21 BY-22 BY-23 BY-24 BY-01 BY-04 BY-06 BY-08 12/29/09 -01/05/10 27 +/-5 26 +/-5 28 +/-5 24 +/-5 25 +/-5 22 +/-5 20 +/-4 20 +/-5 01/05/10 - 01/12/10 26 +/-5 26 +/-5 24 +/-5 25 +/-5 19 +/-5 27 +/-5 25 +/-5 25+/- 5 01/12/10 - 01/19/10 32 +/-5 34 +/-5 36 +/-6 31 +/-5 34 +/-5 32 +/-5 32 +/-5 22+/- 5 01/19/10 -01/26/10 13 +/-4 (1) 13 +/-4 16 +/-4 15 +/-4 13 +/-4 13 +/-4 17 +/-4 19+/- 5 01/26/10 -02/02/10 23 +/-5 20 +/-5 20 +/-5 22 +/-5 20 +/-5 25 +/-5 21 +/-5 20+/- 5 02/02/10 -02/08/10 21 +/-5 23 +/-6 29 +/-6 25 +/-6 21 +/-5 20 +/-5 20 +/-5 18+/- 5 02/08/10 -02/16/10 15 +/-3 12 +/-3 16 +/-3 16 +/-3 16 +/-3 14 +/-3 20 +/-4 12 +/-3 02/16/10 - 02/23/10 14 +/-4 13 +/-4 15 +/-4 16 +/-4 15 +/-4 10 +/-4 12 +/-4 17+/- 4 02/23/10 - 03/02/10 18 +/-4 19 +/-4 22 +/-5 21 +/-4 17 +/-4 18 +/-4 19 +/-4 23+/- 5 03/02/10 -03/09/10 19 +/-4 17 +/-4 26 +/-4 18 +/-4 21 +/-4 19 +/-4 17 +/-4 19,+/-4 03/09/10 - 03/16/10 13 +/-4 10 +/-4 12 +/-4 9 +/-4 12 +/-4 10 +/-4 8 +/-4 15+/- 4 03/16/10 - 03/22/10 20 +/- 5 11 +/- 4 16 +/- 5 17 +/- 5 17 +/- 5 13 +/- 4 15 +/- 5 16 +/- 5 03/22/10 -03/30/10 18 +/-5 14 +/-4 19 +/-5 17 +/-5 22 +/-5 17 +/-5 20 +/-5 18+/- 5 03/30/10 - 04/06/10 16 +/- 4 14 +/- 4 14 +/- 4 15 +/- 4 18 +/- 4 18 +/- 4 12 +/- 4 11 +/- 4 04/06/10 -04/13/10 15 +/-4 15 +/-4 15 +/-4 16 +/-4 15 +/-4 (1) 14 +/-4 15 +/-4 15+/- 4 04/13/10 - 04/20/10 21 +/-4 19 +/-4 20 +/-4 16 +/-4 17 +/-4 17 +/-4 13 +/-4 17+/- 4 04/20/10 - 04/27/10 21 +/-4 16 +/-4 15 +/-4 20 +/-4 16 +/-4 16 +/-4 18 +/-4 16+/- 4 04/27/10 - 05/04/10 15 +/- 4 11 +/- 4 16 +/- 4 14 +/- 4 14 +/- 4 19 +/- 4 15 +/- 4 15 +/- 4 05/04/10 -05/11/10 10 +/-4 8 +/-4 10 +/-4 10 +/-4 9 +/-4 10 +/-4 6 +/-3 9 +/-4 05/11/10 - 05/18/10 < 5 5 7 +/- 4 <6 7 +/- 4 6 +/- 3 8 +/- 4 11 +/- 4 05/18/10 -05/25/10 17 +/-4 17 +/-4 15 +/-4 20 +/-4 18 +/-4 17 +/-4 18 +/-4 15+/- 4 05/25/10 -06/01/10 18 +/-4 18 +/-4 16 +/-4 19 +/-4 15 +/-4 17 +/-4 16 +/-4 (1) 19+/- 4 06/01/10 - 06/08/10 12 +/-4 14 +/-4 15 +/-4 16 +/-4 13 +/-4 13 +/-4 12 +/-4 14+/- 4 06/08/10 - 06/15/10 12 +/- 4 14 +/- 4 11 +/- 4 9 +/- 4 13 +/- 4 10 +/- 4 11 +/- 4 11 +/- 4 06/15/10 - 06/22/10 9 +/- 4 6 +/- 4 10 +/- 4 11 +/- 4 10 +/- 4 8+/-4 10 +/- 4 (1) 8 +/- 4 06/22/10 - 06/29/10 12 +/- 4 10 +/- 3 11 +/- 3 10 +/- 3 12 +/- 4 14 +/- 4 13 +/- 4 11 +/- 4 06/29/10 -07/06/10 15 +/-4 15 +/-4 19 +/-4 20 +/-4 13 +/-4 14 +/-4 14 +/-4 16+/- 4 07/06/10 -07/13/10 16 +/-4 16 +/-4 16 +/-4 16 +/-4 17 +/-4 15 +/-4 14 +/-4 12+/- 4 07/13/10 -07/20/10 21 +/-5 24 +/-5 24 +/-5 23 +/-5 21 +/-5 22 +/-5 21 +/-5 21+/- 5 07/20/10 -07/27/10 15 +/-3 15 +/-3 13 +/-3 16 +/-4 16 +/-3 18 +/-3 18 +/-3 13+/- 3 07/27/10 - 08/03/10 19 +/- 4 20 +/- 4 19 +/- 4 (1) 21 +/- 4 (1) 22 +/- 4 26 +/- 4 20 +/- 4 (1) 20 +/- 4 08/03/10 -08/10/10 21 +/-5 19 +/-5 22 +/-5 18 +/-5 21 +/-5 16 +/-4 20 +/-5 21+/- 5 08/10/10 - 08/17/10 22 +/-4 21 +/- 4 18 +/-4 20 +/-4 19 +/-4 19 +/-4 19 +/-4 18+/- 4 08/17/10 -08/24/10 24 +/-4 26 +/-4 22 +/-4 27 +/-4 25 +/-4 21 +/-4 26 +/-4 25+/- 4 08/24/10 -08/31/10 24 +/-5 18 +/-4 21 +/-5 21 +/-5 26 +/-5 23 +/-5 20 +/-5 20 +/-4 08/31/10 - 09/07/10 10 +/-4 12 +/-4 12 +/-4 14 +/-4 13 +/-4 15 +/-4 15 +/-4 14+/- 4 09/07/10 - 09/14/10 14 +/-4 14 +/-4 16 +/-4 13 +/-4 13 +/-4 15 +/-4 13 +/-4 15+/- 4 09/14/10 -09/21/10 20 +/-4 22 +/-4 17 +/-4 24 +/-5 19 +/-4 18 +/-4 20 +/-4 22+/- 5 09/21/10 - 09/28/10 15 +/-4 18 +/-4 17 +/-4 21 +/-4 15 +/-4 18 +/-4 15 +/-4 17+/- 4 09/28/10 -10/05/10 15 +/-4 12 +/-4 14 +/-4 13 +/-4 18 +/-4 16 +/-4 17 +/-4 18+/- 4 10/05/10 -10/12/10 34 +/-5 29 +/-5 35 +/-5 35 +/-5 36 +/-5 35 +/-5 37 +/-5 37 +/-5 10/12/10 -10/19/10 26 +/-5 23 +/-5 29 +/-5 26 +/-5 25 +/-5 26 +/-5 24 +/-5 25+/- 5 10/19/10 - 10/26/10 22 +/-4 18 +/-4 20 +/-4 17 +/-4 19 +/-4 18 +/-4 16 +/-4 20+/- 4 10/26/10 - 11/02/10 12 +/- 3 12 +/- 3 9 +/- 3 11 +/- 3 11 +/- 3 13 +/- 3 12 +/- 3 10 +/- 3 11/02/10 - 11/09/10 21 +/- 4 21 +/- 4 25 +/- 4 19 +/- 4 22 +/- 4 21 +/- 4 19 +/- 4 20 +/- 4 11/09/10 - 11/16/10 23 +/- 5 24 +/- 5 29 +/- 5 22 +/- 5 24 +/- 5 24 +/- 5 20 +/- 4 23 +/- 5 11/16/10 - 11/22/10 30 +/- 6 26 +/- 5 29 +/- 6 24 +/- 5 29 +/- 5 23 +/- 5 24 +/- 5 24 +/- 5 11/22/10 - 11/30/10 23 +/- 4 21 +/- 4 19 +/- 4 21 +/- 4 20 +/- 5 20 +/- 4 23 +/- 4 27 +/- 4 11/30/10 - 12/07/10 23 +/- 4 21 +/- 4 25 +/- 4 24 +/- 4 23 +/- 4 26 +/- 4 24 +/- 4 24 +/- 4 12/07/10 -12/14/10 27 +/-4 23 +/-4 32 +/-4 28 +/-4 35 +/-4 29 +/-4 33 +/-4 35 +/-4 12/14/10 -12/21/10 27 +/-5 25 +/-5 32 +/-5 30 +/-5 28 +/-5 25 +/-5 24 +/-5 27+/- 5 12/21/10 -12/28/10 13 +/-4 16 +/-4 13 +/-4 13 +/-4 15 +/-4 13 +/-4 13 +/-4 17+/- 4 MEAN 19 +/-12 18 +/-11 19 +/-14 19 +/-12 19 +/-13 18 +/-12 18 +/-12 18 +/-12

THE MEAN AND 2 STANDARD DEVIATION VALUES ARE CALCULATED USING THE POSITIVE VALUES (1) SEE PROGRAM EXCEPTIONS SECTION FOR EXPLANATION C-8 60 of 208

TABLE C-V.2 MONTHLY AND YEARLY MEAN VALUES OF GROSS BETA CONCENTRATIONS INAIR PARTICULATE SAMPLES COLLECTED IN THE VICINITY OF BYRON NUCLEAR GENERATING STATION, 2010 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 IZI/lIUv - UZIUZI IU ]a au I 13 UZIULI IU 1a LIL/L*:1U;:: - UZIUUZI IU LJ LI 02/02/10 - 03/02/10 12 29 18 +/-9 02/02/10 03/02/10 10 21 17 27 02/02/10 - 03/02/10 12 23 17 9 03/02/10 - 03/30/10 9 26 16 +/-8 03/02/10 03/30/10 8 22 16 29 03/02/10 - 03/30/10 15 19 17 +/- 4 03/30/10 - 04/27/10 14 21 17 +/-5 03/30/10 04/27/10 12 18 16 +4 03/30/10 - 04/27/10 11 17 15 +/- 5 04/27/10 - 06/01/10 7 20 14 +/-8 04/27/10 06/01/10 6 19 13 +/- 10 04/27/10 - 06/01/10 9 19 14 + 8 06/01/10 - 06/29/10 6 16 11 +/-5 06/01/10 06/29/10 8 14 12 +4 06/01/10 - 06/29/10 8 14 11 4 06/29/10 - 08/03/10 13 24 18 +/-7 06/29/10 08/03/10 13 26 18 28 06/29/10 - 08/03/10 12 21 16 +/- 8 08/03/10 - 08/31/10 18 27 22 +/-5 08/03/10 08/31/10 16 26 21 +/-6 08/03/10 - 08/31/10 18 25 21 + 6 08/31/10 - 09/28/10 10 24 16 +/-8 08/31/10 09/28/10 13 20 16 +/-5 08/31/10 - 09/28/10 14 22 17 +/- 7 09/28/10 - 11/02/10 9 35 21 +/- 17 09/28/10 11/02/10 11 37 21 +/- 18 09/28/10 - 11/02/10 10 37 22 + 20 11/02/10 - 11/30/10 19 30 24 +/-7 11/02/10 11/30/10 19 29 22 25 11/02/10 - 11/30/10 20 27 23 +/- 6 11/30/10 - 12/28/10 13 32 23 +/- 13 11/30/10 12/28/10 13 35 24 +/- 14 11/30/10 - 12/28/10 17 35 26 15 12/29/09 - 12/28/10 6 36 19 +/- 12 12/29/09 - 12/28/10 6 37 18 +/- 12 12/29/09 - 12/28/10 8 37 18 +/- 12

THE MEAN AND 2 STANDARD DEVIATION VALUES ARE CALCULATED USING THE POSITIVE VALUES 0

k-,

0o

TABLE C-V.3 CONCENTRATIONS OF GAMMA EMITTERS IN AIR PARTICULATE SAMPLES COLLECTED IN THE VICINITY OF BYRON NUCLEAR GENERATING STATION, 2010 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-1 34 Cs-137 Ba-140 La-140 PERIOD BY-01 12/29/09 - 03/30/10 <5 <8 < 27 <3 < 11 <8 < 12 <4 <3 < 1380 < 646 03/30/10 - 06/29/10 <5 <5 < 22 <4 <9 <7 < 13 <3 <3 < 803 < 189 06/29/10 - 09/28/10 <2 <5 < 17 <2 <6 <5 < 10 <2 <2 < 1780 < 715 09/28/10 - 12/28/10 <3 <4 < 14 <2 <6 <4 <8 <3 <2 < 379 < 100 MEAN BY-04 12/29/09 - 03/30/10 <3 <6 < 14 <2 <7 <7 < 11 <3 <2 < 716 < 285 03/30/10 - 06/29/10 <4 <6 < 19 <2 < 11 <6 <9 <4 <3 < 505 < 115 06/29/10 - 09/28/10 <3 <6 < 22 <3 <8 <8 < 15 <3 <3 < 2490 < 841 09/28/10 - 12/28/10 <3 <4 < 17 <4 <8 <7 <8 <3 <3 < 487 < 119 MEAN

(-

BY-06 12/29/09 - 03/30/10 <3 <5 < 21 <2 <8 <7 < 10 <2 <2 < 918 < 224 03/30/10 - 06/29/10 <5 <8 < 18 <4 < 13 <8 < 12 <4 <4 < 610 < 121 06129/10 - 09/28/10 <3 <7 < 26 <3 <7 <7 < 11 <3 <3 < 2790 < 1350 09/28/10 - 12/28/10 <3 <5 < 19 <3 <8 <5 <8 <2 <2 < 273 < 150 MEAN BY-08 12/29/09 - 03/30/10 <3 <8 < 20 .< 3 <7 <9 < 14 <3 <3 < 1030 < 473 03/30/10 - 06/29/10 <3 <5

19 <4 <8 <5 <7 <3 <3 < 479 < 254 06/29/10 - 09/28/10 <3 <7 <14 <2 <7 <7 < 13 <2 <2 < 1980 < 751 09/28/10 - 12/28/10 <2 <3 < 11 <2 <5 <4 <5 <2 <1 < 342 < 130 MEAN BY-21 12/29/09 - 03/30/10 <3 <5 < 16 <3 <7 <5 <8 <2 <2 < 796 < 408 03/30/10 - 06/29/10 <3 <4 < 16 <2 <6 <5 < 12 <3 <3 < 410 < 175 06/29/10 - 09/28/10 <3 <7 < 27 <3 <5 <7 < 11 <2 <2 < 1530 < 425 09/28/10 - 12/28/10 <3 <5 < 13 <3 <9 <5 <9 <3 <3 < 460 < 197 0

MEAN 00

TABLE C-V.3 CONCENTRATIONS OF GAMMA EMITTERS IN AIR PARTICULATE SAMPLES COLLECTED IN THE VICINITY OF BYRON NUCLEAR GENERATING STATION, 2010 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-22 12/29/09 - 03/30/10 <4 <6 < 20 <4 <6 <9 < 13 <4 <4 < 1260 < 312 03/30/10 - 06/29/10 <3 <9 < 19 <5 < 12 <7 < 13 <4 <4 < 746 < 209 06/29/10 - 09/28/10 <3 <7 < 21 <3 < 10 <8 < 17 <4 <3 < 2650 < 1070 09/28/10 - 12/28/10 <3 <5 < 20 <4 <9 <5 < 11 <3 <3 < 514 < 208 MEAN BY-23 12/29/09 - 03/30/10 <4 <8 < 25 <2 < 12 <8 < 15 <4 <4 < 1510 < 516 03/30/10 - 06/29/10 <3 <6 < 15 < 2. <9 <6 < 11 <4 <2 < 507 < 176 06/29/10 - 09/28/10 <4 <8 < 22 <3 < 10 <8 < 15 <3 <3 < 2740 < 904 09/28/10 - 12/28/10 <3 <5 < 13 <3 <7 <7 < 11 <3 <3 < 432 < 206 MEAN C,..

BY-24 12/29/09 - 03/30/10 <3 <7 < 14 <3 <9 <6 < 12 <4 <3 < 1110 < 434 03/30/10 - 06/29/10 <3 <9 < 23 <4 < 12 <8 < 15 <4 <4 < 672 < 270 06/29/10 - 09/28/10 <2 <5 < 19 <3 <6 <7 < 11 <2 <2 < 2100 < 814 09/28/10 - 12/28/10 <2 <4 < 11 <2 <6 <4 <3 <2 <2 < 352 < 143 MEAN 0

0

TABLE C-VI.1 CONCENTRATIONS OF 1-131 IN AIR IODINE SAMPLES COLLECTED IN THE VICINITY OF BYRON NUCLEAR GENERATING STATION, 2010 RESULTS IN UNITS OF E-3 PCI/CU METER +/-2 SIGMA COLLECTION GROUP I IGROUP 11 GROUP III PERIOD BY-21 BY-22 BY-23 BY-24 BY-01 BY-04 BY-06 BY-08 12/29/09-01/05/10 < 69 < 69 < 69 < 69 < 66 < 66 < 66 < 69 01/05/10-01/12/10 < 39 < 39 < 39 < 39 < 38 < 38 < 38 < 38 01/12/10-01/19/10 < 30 < 30 < 30 < 30 < 57 < 57 < 57 < 55 01/19/10 -01/26/10 < 53 (1) < 51 < 52 < 52 < 60 < 60 < 60 < 51 01/26/10 -02/02/10 < 20 < 20 < 20 < 20 <17 < 17 < 17 < 18 02/02/10 -02/08/10 <7 < 15 < 15 < 15 < 13 < 13 < 13 < 13 02/08/10 -02/16/10 < 13 < 13 < 13 < 13 < 10 < 10 < 10 < 10 02/16/10-02/23/10 < 17 <7 < 17 < 17 < 16 < 17 < 17 < 17 02/23/10-03/02/10 < 54 < 54 < 53 < 53 < 48 < 47 < 48 < 49 03/02/10-03/09/10 < 33 < 33 < 33 < 33 < 23 < 23 < 23 < 22 03/09/10 -03/16/10 < 54 < 54 < 54 < 54 < 31 < 31 < 31 < 31 03/16/10-03/22/10 < 47 < 47 < 48 < 20 < 30 < 30 < 30 < 29 03/22/10-03/30/10 < 18 < 18 < 18 < 18 < 14 < 14 < 14 < 14 03/30/10-04/06/10 < 11 < 14 < 14 < 14 <6 < 11 < 11 < 11 04/06/10-04/13/10 < 13 < 13 < 13 <9 < 10 (1) < 10 < 10 < 10 04/13/10-04/20/10 < 65 < 45 < 44 < 44 < 65 < 35 < 65 < 64 04/20/10-04/27/10 < 40 < 40 < 40 < 41 < 35 < 34 < 34 < 34 04/27/10-05/04/10 < 38 < 38 < 37 < 37 < 39 < 39 < 21 < 40 05/04/10-05/11/10 < 46 < 46 < 46 < 46 < 37 < 37 < 36 < 35 05/11/10 - 05/18/10 < 21 < 24 < 24 < 24 < 21 < 20 < 20 < 12 05/18/10 -05/25/10 < 48 < 48 < 48 < 47 < 39 < 38 < 38 < 37 05/25/10 -06/01/10 < 16 < 42 < 42 < 42 < 38 < 37 < 37 (1) < 39 06/01/10 -06/08/10 < 64 < 63 < 65 < 65 < 42 < 44 < 44 < 42 06/08/10 -06/15/10 < 29 < 17 < 29 < 29 < 32 < 31 < 32 < 33 06/15/10 -06/22/10 < 26 < 26 < 26 < 26 < 37 < 38 < 38 (1) < 36 06/22/10 -06/29/10 < 24 < 24 < 24 < 24 < 22 < 22 < 22 < 22 06/29/10 -07/06/10 < 15 < 15 < 15 < 15 < 13 < 13 < 13 < 12 07/06/10 -07/13/10 < 61 < 61 < 26 < 61 < 41 < 42 < 42 < 63 07/13/10 -07/20/10 < 41 < 40 < 40 < 40 < 29 < 29 < 29 < 28 07/20/10 -07/27/10 < 44 < 44 < 45 < 19 < 40 < 40 < 41 < 41 07/27/10 -08/03/10 < 52 < 53 < 53 (1) < 53 (1) < 37 < 38 < 38 (1) < 37 08/03/10 -08/10/10 < 33 < 48 < 48 < 48 < 18 < 32 < 32 < 33 08/10/10 -08/17/10 < 43 < 43 < 43 < 44 < 45 < 47 < 46 < 44 08117/10 -08/24/10 < 48 < 67 < 67 < 67 < 49 < 26 < 48 < 50 08/24/10 -08/31/10 < 47 < 47 < 47 < 47 < 32 < 32 < 32 < 31 08/31/10 -09/07/10 < 36 < 53 < 53 < 53 < 36 < 36 < 20 < 37 09/07/10 -09/14/10 < 43 < 43 < 43 < 43 < 68 < 68 < 68 < 66 09/14/10 -09/21/10 < 67 < 67 < 67 < 67 < 44 < 44 < 44 < 25 09/21/10 -09/28/10 < 49 < 49 < 48 < 49 < 47 < 48 < 47 < 47 09/28/10 -10/05/10 < 63 < 63 < 63 < 62 < 22 < 21 < 22 < 22 10/05/10 -10/12/10 < 68 < 68 < 68 < 69 < 40 < 40 < 40 < 38 10112110 -10/19/10 < 55 < 23 < 55 < 55 < 58 < 57 < 58 < 60 10/19/10 -10/26/10 < 65 < 65 < 64 < 64 < 57 < 57 < 57 < 55 10/26/10 -11/02/10 < 54 < 54 < 23 < 55 < 58 < 57 < 57 < 56 11/02/10 -11/09/10 < 18 < 18 < 18 < 18 < 13 < 13 < 13 < 13 11/09/10 -11/16/10 < 16 < 16 < 16 < 12 < 16 < 15 < 15 < 16 11/16/10 -11/22/10 < 31 < 31 < 30 < 30 < 26 < 27 < 27 < 26 11/22/10 -11/30/10 < 40 < 40 < 40. <41 < 51 < 51 < 51 < 50 11/30/10 - 12/07/10 < 65 < 65 < 64 < 64 < 45 < 46 < 45 < 47 12/07/10 -12/14/10 < 34 < 35 < 35 < 35 < 35 < 19 < 35 < 33 12/14/10 -12/21/10 < 55 < 54 < 54 < 54 < 57 < 56 < 58 < 58 12/21/10 -12/28/10 < 57 < 62 < 62 < 62 < 58 < 57 < 24 < 56 MEAN - - - - - - - -

(1) SEE PROGRAM EXCEPTIONS SECTION FOR EXPLANATION C-12 C-12 64 of 208

TABLE C-VII.1 CONCENTRATIONS OF 1-131 IN MILK SAMPLES COLLECTED IN THE VICINITY OF BYRON NUCLEAR GENERATING STATION, 2010 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA CONTROL FARM INDICATOR FARM COLLECTION BY-26-1 I BY-20-1 BY-30-1 PERIOD 01/05/10 < 0.3 < 0.2 < 0.4 02/02/10 < 0.7 < 0.5 < 0.5 03/02/10 < 0.7 < 0.8 < 0.8 04/06/10 < 0.7 < 0.7 < 0.8 05/04/10 < 0.7 < 0.6 < 0.7 05/18/10 < 0.6 < 0.4 < 0.8 06/01/10 < 0.7 < 0.9 < 0.7 06/15/10 < 0.7 < 0.7 < 0.8 06/29/10 < 0.8 < 0.8 < 0.9 07/13/10 < 0.9 < 0.9 < 0.9 07/27/10 < 0.9 < 0.9 < 0.8 08/10/10 < 0.7 < 0.7 < 0.9 08/24/10 < 0.5 < 0.5 < 0.6 09/07/10 < 0.5 < 0.7 < 0.5 09/21/10 < 0.6 < 0.6 < 0.6 10/05/10 < 0.8 < 0.8 < 0.9 10/19/10 < 0.5 < 0.6 < 0.6 11/02/10 < 0.8 < 0.6 < 0.6 12/07/10 < 1.0 < 0.9 < 0.9 MEAN C-13 65 of 208

TABLE C-VII.2 CONCENTRATIONS OF GAMMA EMITTERS IN MILK SAMPLES COLLECTED IN THE VICINITY OF BYRON NUCLEAR GENERATING STATION, 2010 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 01/05/10 <5 <6 < 14 <6 < 11 <5 <9 <5 <4 < 44 < 15 02/02/10 <9 <8 < 18 <9 < 17 <9 < 13 <7 <9 < 40 < 10 03/02/10 <8 <7 < 16 <7 < 14 <7 < 13 <7 <7 < 32 < 12 04/06/10 <5 <5 < 12 <5 < 11 <6 <9 <4 <6 < 32 < 11 05/04/10 <3 <4 <9 <4 <8 <4 <6 <3 <3 < 27 <9 05118/10 <2 <2 <7 <2 <4 <3 <4 <2 <2 < 37 < 10 06/01/10 <2 <2 <6 <2 <5 <2 <4 <2 <2 < 24 <7 06/15/10 <6 <7 < 15 <7 < 16 <7 < 11 <6 <6 < 37 <9 06/29/10 <5 <6 < 11 <7 < 14 <5 <9 <4 <6 < 28 <8 07/13/10 <7 <7 < 15 <7 < 14 <6 < 12 <6 <8 < 31 <9 07/27/10 <7 <8 < 15 <7 < 18 <8 < 13 <7 <8 < 33 < 11 08/10/10 <5 <6 < 12 <5 < 13 <6 < 10 <6 <6 < 32 <8 08/24/10 <5 <5 < 11 <6 < 11 <5 <8 <5 <5 < 27 <7 09/07/10 <6 <7 < 14 <7 < 13 <9 < 14 <6 <6 <34 < 10 09/21/10 <5 <5 < 14 <7 < 11 <6 <9 <5 <6 < 37 <9 10/05/10 <7 <8 < 17 <8 < 18 <8 < 15 <6 <8 < 32 < 10 10/19/10 <7 <7 < 17 <6 < 17 <6 < 11 <5 <7 < 40 < 10 11/02/10 <6 <7 < 16 <8 < 15 <7 < 12 <6 <7 < 40 < 15 12/07/10 <6 <6 < 18 <8 < 17 <7 < 12 <6 <7 < 40 < 10 MEAN ON ON t',J 0Q

TABLE C-VII.2 CONCENTRATIONS OF GAMMA EMITTERS IN MILK SAMPLES COLLECTED IN THE VICINITY OF BYRON NUCLEAR GENERATING STATION, 2010 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 01/05/10 <5 <6 < 15 <5 < 12 <6 <9 <5 <5 < 56 < 13 02/02/10 <5 <6 < 12 <5 < 14 <7 <9 <5 <6 < 29 <9 03/02/10 <6 <7 < 16 <7 < 16 <7 < 14 <7 <7 < 40 <9 04/06/10 <5 <5 < 12 <5 < 12 <5 <9 <4 <5 < 36 < 11 05/04/10 <2 <3 <7 <2 <5 <3 <5 <2 <2 < 48 < 13 05/18/10 <2 <2 <6 <2 <5 <3 <4 <2 <2 < 33 < 10 06/01/10 <1 <1 <3 <1 <2 <1 <2 <1 <1 < 12 <4 06/15/10 <4 <4 <9 <4 <9 <4 <6 <3 <4 < 19 <5 06/29/10 <7 <6 < 16 <7 < 11 <7 < 12 <6 <6 < 30 <9 07/13/10 <4 <5 < 10 <5 < 10 <4 <7 <4 <4 < 20 <6 07/27/10 <5 <6 < 15 <7 < 14 <7 < 11 <5 <5 < 25 <9 08/10/10 <5 <5 < 14 <6 < 12 <5 <9 <4 <5 < 31 <8 08/24/10 <7 <7 < 13 <8 < 15 <8 < 12 <6 <6 < 35 <8 09/07/10 <6 <6 < 12 <6 < 14 <6 < 13 <6 <5 < 30 <8 09/21/10 <6 <6 < 16 <7 < 15 <8 < 11 <6 <7 <44 < 14 10/05/10 <7 <7 < 16 <8 < 14 <7 < 13 <6 <7 < 32 <6 10/19/10 <7 <6 < 17 <8 < 19 <8 < 13 <6 <7 < 38 < 10 11/02/10 <5 <6 < 14 <7 < 11 <6 < 10 <5 <5 < 35 < 13 12/07/10 <5 <6 < 15 <7 < 15 <7 < 10 <5 <7 < 33 < 11 MEAN 0'

00

TABLE C-VII.2 CONCENTRATIONS OF GAMMA EMITTERS IN MILK SAMPLES COLLECTED INTHE VICINITY OF BYRON NUCLEAR GENERATING STATION, 2010 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-1 34 Cs-137 Ba-140 La-140 PERIOD BY-30-1 01/05/10 <5 <4 <11 <4 < 10 <5 <8 <4 <4 < 47 < 12 02/02/10 <5 <5 <11 <6 < 12 <5 <7 <5 <5 < 22 <5 03/02/10 <7 <7 < 14 <7 < 16 <6 < 13 <6 <8 < 36 < 11 04/06/10 <5 <7 < 14 <5 < 14 <7 < 12 <6 <7 < 48 < 12 05/04/10 <3 <4 < 10 <4 <7 <4 <8 <3 <4 < 30 <9 05/18/10 <2 <2 <5 <2 <4 <2 <4 <1 <2 < 30 <9 06/01/10 <2 <3 <6 <2 <5 <3 <5 <2 <2 < 28 <7 06/15/10 <7 <6 < 16 <7 < 15 <7 < 12 <7 <7 < 38 <9 06/29/10 <7 <7 < 18 <9 < 17 <8 < 13 <7 <8 < 41 < 12 07/13/10 <4 <4 < 10 <4 <8 <4 <6 <4 <4 < 18 <6 07/27/10 <8 <8 < 18 <7 < 14 <9 < 10 <6 <8 < 28 < 11 08/10/10 <5 <5 < 12 <5 < 12 <6 <8 <4 <5 < 24 <8 08/24/10 <7 <8 < 16 <9 < 16 <7 < 14 <7 <8 < 38 < 13 09/07/10 <4 <5 < 11 <5 <9 <4 <7 <3 <4 < 20 <6 09/21/10 <6 <7 < 14 <7 < 15 <7 < 11 <5 <6 < 40 < 11 10/05/10 <6 <6 < 13 <9 < 14 <7 < 11 <6 <7 < 32 <9 10/19/10 <5 <6 < 13 <5 < 14 <6 < 11 <5 <5 < 35 <8 11/02/10 <5 <6 < 15 <7 < 11 <6 < 11 <5 <5 < 35 < 14 12/07/10 <7 <6 <17 <9 <15 <8 <11 <7 <8 <40 <9 MEAN 00ý 00 00

TABLE C-VIII.1 CONCENTRATIONS OF GAMMA EMITTERS INVEGETATION SAMPLES COLLECTED IN THE VICINITY OF BYRON NUCLEAR GENERATING STATION, 2010 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 Potatoes 08/24/10 <6 <6 <17 <7 <13 <7 <11 <55 <5 <6 < 79 < 22 Swiss Chard/Rhubarb 08/24/10 <5 <6 <15 <6 <12 <6 <11 <44 <4 <4 <70 < 19 MEAN BY-QUAD 1 Beets 08/23/10 <5 <12 <5 <9 <6 < 10 <50 <5 <5 < 66 < 19 Cabbage 08/23/10 <5 <13 <5 <10 <6 <10 <53 <4 <5 < 75 < 18 MEAN BY-QUAD 2 Beet greens 08/23/10 <6 <7 <20 <8 <16 <8 <13 <56 <6 <6 <84 <24 Beets 08/23/10 <5 <5 <13 <6 <11 <6 <10 <53 <4 <5 <73 <16 MEAN BY-QUAD 3 Cabbage 08/23/10 <3 <4 <10 <4 <8 <4 <7 <37 <3 <3 <48 <14 Carrots/beets 08/23/10 <6 <7 <17 <7 <14 <7 <13 <59 <5 <7 <78 <23 MEAN BY-QUAD 4 Beet greens 08/23/10 <5 <6 <16 <7 <13 <6 <11 <53 <5 <5 <74 <17 Onions/leeks 08/23/10 <5 <5 <11 <6 <11 <6 <11 <53 <5 <6 <74 <19 MEAN 0

C>

00

TABLE C-IX.1 QUARTERLY TLD RESULTS FOR BYRON NUCLEAR GENERATING STATION, 2010 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-01-1 22 +/- 6 24 20 25 19 BY-01-2 21 +/- 8 25 17 23 18 BY-04-1 24 +/- 9 27 20 29 21 BY-04-2 23 +/- 7 25 21 27 20 BY-06-1 21 +/- 10 27 17 24 17 BY-06-2 21 +/- 6 23 18 24 19 BY-08-1 22 +/- 10 25 17 27 18 BY-08-2 22 +/- 9 26 17 25 18 BY-21-1 21 +/- 7 25 17 23 20 BY-21-2 21 +/- 8 25 16 24 19 BY-22-1 25 +/- 10 29 19(1) 29 23 BY-22-2 27 +/- 9 33 22 27 25 BY-23-1 25 +/- 8 27 20 29 22 BY-23-2 24 +/- 8 28 21 27 21 BY-24-1 24 +/- 7 28 20 26 22 BY-24-2 24 +/- 8 28 20 27 21 BY-101-1 20 +/- 6 22 17 23 18 BY-101-2 20 +/-8 24 16 23 18 BY-102-1 26 +/-6 26 25 30 23 BY-102-2 26 +/- 7 28 22 30 25 BY-103-1 24 +/- 8 27 20 27 21 BY-103-2 28 +/- 10 33 (1) 29 23 BY-103-3 24 +/- 5 27 22 25 22 BY-104-1 25 +/- 8 27 21 29 22 BY-104-2 26 +/- 6 26 23 30 24 BY-104-3 25 +/- 8 28 20 28 22 BY-105-1 25 +/- 4 27 23 27 24 BY-105-2 27 +/- 6 28 25 30 24 BY-106-1 25 +/- 6 26 21 28 23 BY-106-2 25 +/- 5 27 23 28 23 BY-107-1 27 +/- 8 28 22 31 25 BY-107-2 26 +/- 6 28 23 29 24 BY-107-3 23 +/- 9 27 19 27 20 BY-108-1 26 +/- 7 28 22 30 24 BY-108-2 23 +/- 6 24 20 27 21 BY-109-1 25 +/- 8 28 20 28 22 BY-109-2 25 +/- 7 28 21 27 23 BY-110-1 23 +/- 10 27 18 27 19 BY-110-2 23 +/- 8 27 20 26 20 BY-111-3 25 +/- 8 27 21 30 22 BY-111-4 25 +/- 10 28 20 30 21 BY-112-3 24 +/- 7 27 21 27 21 BY-112-4 25 +/-7 27 22 28 21 BY-113-1 25 +/- 8 27 21 29 22 BY-113-2 22 +/- 6 25 21 24 19 BY-114-1 24 +/- 11 27 18 30 20 BY-114-2 25 +/- 11 24 20 33 22 BY-115-1 26 +/- 10 27 22 32 21 BY-115-2 24 +/- 5 24 22 27 21 BY-116-1 23 +/- 10 27 18 28 19 BY-116-2 22 +/- 7 25 18 25 20 (1) SEE PROGRAM EXCEPTIONS SECTION FOR EXPLANATION C-18 70 of 208

TABLE C-IX.1 QUARTERLY TLD RESULTS FOR BYRON NUCLEAR GENERATING STATION, 2010 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-1 16-3 23 +/- 8 26 19 20 BY-201-3 24 +/- 10 28 19 20 BY-201-4 24 +/- 4 26 23 22 BY-202-1 26 +/- 6 28 24 23 BY-202-2 26 +/- 10 32 22 22 BY-203-1 20 +/-8 23 16 17 BY-203-2 23 +/- 7 26 19 21 BY-204-1 23 +/-9 26 18 19 BY-204-2 25 +/- 6 27 22 23 BY-205-1 25 +/- 6 27 21 24 BY-205-2 23 +/- 7 25 20 21 BY-206-1 25 +/- 7 28 21 23 BY-206-2 25 +/- 8 27 21 22 BY-207-1 26 +/- 5 26 24 24 BY-207-2 25 +/- 6 28 21 24 BY-208-1 26 +/- 6 27 22 24 BY-208-2 25 +/- 6 26 22 23 BY-209-1 26 +/- 10 27 21 23 BY-209-4 25 +/- 9 26 21 23 BY-210-3 25 +/- 7 27 20 24 BY-210-4 24 +/- 8 27 20 21 BY-21 1-1 25 +/- 8 28 21 22 BY-211-4 24 +/- 7 28 20 23 BY-212-1 26 +/- 10 30 22 21 BY-212-4 27 +/- 8 27 25 23 BY-213-1 25 +/- 7 27 21 23 BY-213-4 25 +/- 6 27 21 24 BY-214-1 24 +/- 7 27 20 22 BY-214-4 25 +/- 9 28 21 22 BY-215-1 26 +/- 8 28 22 23 BY-215-4 26 +/- 8 28 22 23 BY-216-1 27 +/- 5 28 23 26 BY-216-2 25 +/- 8 28 20 23 BY-301-1 22 +/- 8 25 19 18 BY-302-1 24 +/- 7 29 20 23 BY-309-1 23 +/- 7 25 18 23 BY-309-2 24 +/- 6 26 21 22 BY-309-3 25 +/- 9 27 21 21 BY-309-4 21 +/- 8 22 17 19 BY-314-1 21 +/- 8 25 17 19 C-19 71 of 208

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, 2010 RESULTS IN UNITS OF MILLI-ROENTGEN/QUARTER STANDARD DEVIATIONS OF THE STATION DATA COLLECTION INNER RING OUTER RING SPECIAL INTEREST OTHER CONTROL PERIOD +/-2 S.D.

JAN-MAR 26.7 +/- 3.6 27.2 +/- 3.0 25.6 +/- 4.3 26.7 +/- 5.0 25.5 +/- 1.4 APR-JUN 20.7 +/- 4.1 21.1 +/- 3.5 19.0 +/- 3.5 19.1 +/- 3.7 17.0 +/- 0.0 JUL-SEP 28.0 +/- 4.6 28.4 +/- 3.7 25.9 +/- 4.2 26.0 +/- 4.4 26.0 +/- 2.8 OCT-DEC 21.6 +/- 3.8 22.4 +/- 3.4 20.7 +/- 4.1 20.5 +/- 4.2 18.0 +/- 0.0 TABLE C-IX.3

SUMMARY

OF THE AMBIENT DOSIMETRY PROGRAM FOR BYRON NUCLEAR GENERATING STATION, 2010 RESULTS IN UNITS OF MILLI-ROENTGEN/QUARTER LOCATION SAMPLES PERIOD PERIOD PERIOD MEAN ANALYZED MINIMUM MAXIMUM +/- 2 S.D.

INNER RING 143 16 33 24.3 +/- 7.5 OUTER RING 128 16 32 24.8 +/- 7.0 SPECIAL INTEREST 28 17 30 22.8 +/- 7.2 OTHER 56 16 33 23.1 +/- 7.9 CONTROL 8 17 27 21.6 +/- 8.9 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-1 14-1, BY-1 14-2, BY-1 15-1, BY-1 15-2, BY-1 16-1, BY-1 16-2, BY-1 16-3 OUTER RING STATIONS - BY-201-3, BY-201-4, BY-202-1, BY-202-2, BY-203-1, BY-203-2, BY-204-1, BY-204-2, BY-205-1, BY-205-2, BY-206-1, BY-206-2, BY-207-1, BY-207-2, BY-208-1, BY-208-2, BY-209-1, BY-209-4, BY-210-3, BY-210-4, BY-211-1, BY-211-4, BY-212-1, BY-212-4, BY-213-1, BY-213-4, BY-214-1, BY-214-4, BY-215-1, BY-215-4, BY-216-1, BY-216-2 SPECIAL INTEREST STATIONS - BY-301-1, BY-302-1, BY-309-1, BY-309-2, BY-309-3, BY-309-4, BY-314-1 OTHER STATIONS - BY-01-1, BY-01-2, BY-04-1, BY-04-2, BY-06-1, BY-06-2, BY-21-1, BY-21-2, BY-22-1, BY-22-2, BY-23-1, BY-23-2, BY-24-1, BY-24-2 CONTROL STATIONS - BY-08-1, BY-08-2 C-20 72 of 208

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

ý9 4n +

pV~%

0:o 4--

CI(1-01-00 12-311-00 12- 3 14) 1 1?..31.:~2 ~2>31..o3 1?.

BY-29 (C) Byron, Upstream 14,0 10-0.

No sampn!:srý No samples: No'*sarpzes:

riverfcfozlýr, ýje razenl. rive frozen.

--J 4.0o, 4.4

~1 U 2- 1-.$JU 12.Y -I~.~1 1...- -4 2 1~.< T~-U ~ <-4.

C-21 73 of 208

FIGURE C-1 (cont.)

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

Collected in the Vicinity of BNGS, 2005 - 2010 BY-12 Oregon Pool of Rock River, Downstream 10.0 8.0 6.0 CL 4.0 2.0 0.0 I I I 01-10-05 01-08-06 01-06-07 01-04-08 01-01-09 12-30-09 12-28-10 BY-29 (C) Byron, Upstream 10.0 8.0 6.0

.-J 4.0 2.0 0.0IIIIII 01-10-05 01-08-06 01-06-07 01-04-08 01-01-09 12-30-09 12-28-10 DUE TO VENDOR CHANGE IN 2005, < VALUES ARE LLD VALUES JANUARY THROUGH JUNE 2005 AND MDC VALUES AFTER JUNE 2005 C-22 74 of 208

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 300 3500 3100 2700 2300

-.J 1900 500 1100

3k

-100 01-01-00 12-31-0 12-lI -01 12-31 -02 12-31-03 *12-30-04 BY-29(C) Byron, Upstream 500 -

400-

30,0 200 -

100 "I\_ N-(7

-100 0, -01L0O 12-31-00 12-3T-01 12-3t-02 12- -03 U2-30--04 C-23 75 of 208

FIGURE C-2 (cont.)

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

Collected in the Vicinity of BNGS, 2005 - 2010 BY-12 Oregon Pool of Rock River, Downstream 4500 4000 3500 3000

-I 2500

0. 2000 1500 1000 500 0 l I l - i 03-3 1-05 05-12-06 06-23-07 08-03-08 09-14-09 10-26-10 BY-29 (C) Byron, Upstream 250 -

200 +

150 +

,J C.,

100 50 +

0 -

03-31-05 05-12-06 06-23-07 08-03-08 09-14-09 10-26-10 DUE TO VENDOR CHANGE IN 2005, < VALUES ARE LLD VALUES JANUARY THROUGH JUNE 2005 AND MDC VALUES AFTER JUNE 2005 C-24 76 of 208

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 4CO 3WO 200-7'

\ /

Ot-0l-010 12-314)0 12-S1-d1 12-31--]2 12-31-03 12-3D-04 BY-18 McCoy Farmstead Well 4OG.

2WO Nm.-

toG "INý, / \ / /-ý,

01-011-00 12-31-aD 12,.1.01 12,S01-12 12-AI-03 12'-.0-94 C-25 77 of 208

FIGURE C-3 (cont.)

Ground Water - Tritium - Stations BY-14-1 and BY-18 Collected in the Vicinity of BNGS, 2005 - 2010 BY-14-1 3200 N. German Church Road 250 200 150

.- I C.,

100 50 0

03-3 1-05 05-12-06 06-23-07 08-03-08 09-14-09 10-26-10 BY-18 McCoy Farmstead Well 250 200 150 CL C.,

100 50 0

03-3 1-05 05-12-06 06-23-07 08-03-08 09-14-09 10-26-10 DUE TO VENDOR CHANGE IN 2005, < VALUES ARE LLD VALUES JANUARY THROUGH JUNE 2005 AND MDC VALUES AFTER JUNE 2005 C-26 78 of 208

FIGURE C-4 Ground Water - Tritium - Stations BY-1 8-1 Collected in the Vicinity of BNGS, 2010 BY-18-1 Calhoun 200 150 100 0.

50 0 I I 1 07-01-10 08-01-10 09-01-10 10-01 -10 C-27 79 of 208

FIGURE C-5 Ground Water - Tritium - Station BY-32 Collected in the Vicinity of BNGS, 2000 - 2004 BY-32 Wolford Well 500 T 400 +

2004 100-

// /\ /~'N./

I 0+

/

-1001 0"1-00 12-31-100 12-31-01 12-31-02 12-31-03 12-3f04 C-28 80 of 208

FIGURE C-5 (cont.)

Ground Water - Tritium - Station BY-32 Collected in the Vicinity of BNGS, 2005 - 2010 BY-32 Wolford Well 250 T 200 150

,J 0,.

100 +

50 +

0 -

03/31/05 05/12/06 06/23/07 08/03/08 09/14/09 10/26/10 DUE TO VENDOR CHANGE IN 2005, < VALUES ARE LLD VALUES JANUARY THROUGH JUNE 2005 AND MDC VALUES AFTER JUNE 2005 C-29 81 of 208

FIGURE C-6 Ground Water - Tritium - Stations BY-35 and BY-36 Collected in the Vicinity of BNGS, 2006 - 2010 BY-35 250 T 200 150

--J 0.

100 +

50 t 0 -

04-11-06 03-09-07 02-04-08 01-01-09 11-29-09 10-27-10 BY-36 250 -

200

,-J 150 C.,

100 +

50 +

0 1 I I I 04-11-06 03-09-07 02-04-08 01-01-09 11-29-09 10-27-10 NEW STATIONS IN 2006 C-30 82 of 208

FIGURE C-7 Ground Water - Tritium - Stations BY-37 Collected in the Vicinity of BNGS, 2006 - 2010 BY-37 250 T-200 +I 150

-I C.,

100 +

50 +

0 i 04-11-06 03-09-07 02-04-08 01-01-09 11-29-09 10-27-10 NEW STATION IN 2006 C-31 83 of 208

FIGURE C-8 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

9.

0"1-0-00 12-31-W( 1231-41 12-11-02 12-31-OS BY-21 Byron Nearslte N 10

.1

~ 4 4

01-01-00 2-31-CO 12-31-01 12-31 -02 12-31.03 C-32 84 of 208

FIGURE C-8 (cont.)

Air Particulates - Gross Beta - Stations BY-08 (C) and BY-21 Collected in the Vicinity of BNGS, 2005 - 2010 BY-08 (C) Leaf River 60.0 50.0 40.0 C.

0M 30.0 9

II D 20.0 10.0 0.0 -

01-04-05 03-17-06 05-28-07 08-07-08 10-18-09 12-29-10 BY-21 Byron Nearsite N 60.0 50.0 40.0 0.

30.0 903 tw CD 20.0 10.0 0.0 01-04-05 03-17-06 05-28-07 08-07-08 10-18-09 12-29-10 DUE TO VENDOR CHANGE IN 2005, THE REPORTED UNITS CHANGED FROM E-02 PCI/M3 TO E-03 PCI/M3 C-33 85 of 208

FIGURE C-9 Air Particulates - Gross Beta - Stations BY-22 and BY-23 Collected in the Vicinity of BNGS, 2000 - 2004 BY.22 Byron Nearsite ESE 1L~

I]

,2 a X 1 B2-31* 2-31-01 1 2-r31-32 BY-23 Byron Nearsite S S0.0 cP*

0F1-01-10 12-31-00 12-31ý01 I142 12-31,3 C-34 86 of 208

FIGURE C-9 (cont.)

Air Particulates - Gross Beta - Stations BY-22 and BY-23 Collected in the Vicinity of BNGS, 2005 - 2010 BY-22 Byron Nearsite ESE 60.0 50.0 M. 40.0 E

(,,1 a.

30.0 9

uJ 0

20.0 10.0 0.04-01-04-05 03-17-06 05-28-07 08-07-08 10-18-09 12-29-10 BY-23 Byron Nearsite S 60.0 50.0

m. 40.0 E

6

0. 30.0 9

w 0 20.0 10.0 0.0 01-04-05 03-17-06 05-28-07 08-07-08 10-18-09 12-29-10 DUE TO VENDOR CHANGE IN 2005, THE REPORTED UNITS CHANGED FROM E-02 PCI/M3 TO E-03 PCI/M3 C-35 87 of 208

FIGURE C-10 Air Particulates - Gross Beta - Station BY-24 Collected in the Vicinity of BNGS, 2000 - 2004 BY-24 Byron Nearsite SW

&0 4.0]

ik 2.0 0~ ,1,01-01 12ý:1t 40 1.;-31 -,1 1231-0*2 12-31-03 12-1-0-04 C-36 88 of 208

FIGURE C-10 (cont.)

Air Particulates - Gross Beta - Station BY-24 Collected in the Vicinity of BNGS, 2005 - 2010 BY-24 Byron Nearsite SW 60.0 50.0 40.0 E

0- 30.0 oU 20.0 10.0 0.0 I 01-04-05 03-17-06 05-28-07 08-07-08 10-18-09 12-29-10 DUE TO VENDOR CHANGE IN 2005, THE REPORTED UNITS CHANGED FROM E-02 PCI/M3 TO E-03 PCI/M3 C-37 89 of 208

FIGURE C-11 Air Particulates - Gross Beta - Stations BY-01 and BY,04 Collected in the Vicinity of BNGS, 2005 - 2010 BY-01 60.0 50.0 40.0 C-)

30.0 C.

uJ o

20.0 10.0 0.0 07-05-05 08-10-06 09-15-07 10-20-08 11-25-09 12-31-10 BY-04 60.0 50.0 40.0 C.)

0. 30.0 9m CU

,e- 20.0 10.0 0.0 07-05-05 08-10-06 09-15-07 10-20-08 11-25-09 12-31-10 AIR PARTICULATE GROSS BETA ANALYSES OF FAR FIELD LOCATIONS STARTED IN JULY 2005 C-38 90 of 208

FIGURE C-12 Air Particulates - Gross Beta - Station BY-06 Collected in the Vicinity of BNGS, 2005 - 2010 BY-06 60.0 50.0 c3 40.0 E

U.

C 30.0 9

o 20.0 10.0 0.0 I 07-05-05 08-10-06 09-15-07 10-20-08 11-25-09 12-31-10 AIR PARTICULATE GROSS BETA ANALYSES OF FAR FIELD LOCATIONS STARTED IN JULY 2005 C-39 91 of 208

Intentionally left blank 92 of 208

APPENDIX D INTER-LABORATORY COMPARISON PROGRAM 93 of 208

94 of 208 TABLE D-1 ANALYTICS ENVIRONMENTAL RADIOACTIVITY CROSS CHECK PROGRAM TELEDYNE BROWN ENGINEERING, 2010 (PAGE 1 OF 3)

Identification Reported Known Ratio (c)

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

March 2010 E6978-396 Milk Sr-89 pCi/L 89.3 92.8 0.96 A Sr-90 pCi/L 13.8 12.7 1.09 A E6979-396 Milk 1-131 pCi/L 65.2 74.0 0.88 A Ce-141 pCi/L 241 261 0.92 A Cr-51 pCi/L 388 361 1.07 A Cs-1 34 pCi/L 157 178 0.88 A Cs-1 37 pCi/L 150 158 0.95 A Co-58 pCi/L 143 143 1.00 A Mn-54 pCi/L 202 207 0.98 A, Fe-59 pCi/L 146 137 1.07 A Zn-65 pCi/L 247 254 0.97 A Co-60 pCi/L 177 183 0.97 A E6981-396 AP Ce-141 pCi 211 185 1.14 A Cr-51 pCi 304 255 1.19 A Cs-134 pCi 142 125 1.14 A Cs-137 pCi 131 111 1.18 A Co-58 pCi 119 101 1.18 A Mn-54 pCi 162 146 1.11 A Fe-59 pCi 110 97 1.14 A Zn-65 pCi 217 179 1.21 W Co-60 pCi 145 129 1.12 A E6980-396 Charcoal 1-131 pCi 80.2 85.6 0.94 A June 2010 E7132-396 Milk Sr-89 pCi/L 82.0 93.4 0.88 A Sr-90 pCi/L 15.8 16.7 0.95 A E7133-396 Milk 1-131 pCi/L 83.5 96.9 0.86 A Ce-141 pCi/L 107 110 0.97 A Cr-51 pCi/L 325 339 0.96 A Cs-134 pCi/L 114 126 0.90 A Cs-137 pCi/L 144 150 0.96 A Co-58 pCi/L 92.3 101 0.91 A Mn-54 pCi/L 165 169 0.98 A Fe-59 pCi/L 121 119 1.02 A Zn-65 pCi/L 197 206 0.96 A Co-60 pCi/L 190 197 0.96 A E7135-396 AP Ce-141 pCi 88.4 91.6 0.97 A Cr-51 pCi 292 282 1.04 A Cs-134 pCi 101 105 0.96 A Cs-137 pCi 132 125 1.06 A Co-58 pCi 87.3 84.0 1.04 A Mn-54 pCi 150 140 1.07 A Fe-59 pCi 105 98.6 1.06 A Zn-65 pCi 168 171 0.98 A Co-60 pCi 170 163 1.04 A E7134-396 Charcoal 1-131 pCi 76.4 79.9 0.96 A D-1 95 of 208

TABLE D-1 ANALYTICS ENVIRONMENTAL RADIOACTIVITY CROSS CHECK PROGRAM TELEDYNE BROWN ENGINEERING, 2010 (PAGE 2 OF 3)

Identification Reported Known Ratio (c)

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

September 2010 E7229-396 Milk Sr-89 pCi/L 85.0 92.8 0.92 A Sr-90 pCi/L 12.6 14.7 0.86 A E7230-396 Milk 1-131 pCi/L 80.2 94.1 0.85 A Ce-141 pCi/L 130 130 1.00 A Cr-51 pCi/L 235 234 1.00 A Cs-134 pCi/L 83.2 93.0 0.89 A Cs-137 pCi/L 95.1 94.5 1.01 A Co-58 pCi/L 77.3 73.7 1.05 A Mn-54 pCi/L 121 119 1.02 A Fe-59 pCi/L 96.4 91.1 1.06 A Zn-65 pCi/L 216 204 1.06 A Co-60 pCi/L 172 171 1.01 A E7232-396 AP Ce-141 pCi 122 119 1.03 A Cr-51 pCi 228 214 1.07 A Cs-1 34 pCi 79.9 85.3 0.94 A Cs-137 pCi 93.8 86.7 1.08 A Co-58 pCi 71.5 67.6 1.06 A Mn-54 pCi 113 110 1.03 A Fe-59 pCi 73.8 83.6 0.88 A Zn-65 pCi 186 187 0.99 A Co-60 pCi 163 157 1.04 A E7231-396 Charcoal 1-131 pCi/L 62.3 59.9 1.04 A December 2010 E7375-396 Milk Sr-89 pCi/L 92.7 98.0 0.95 A Sr-90 pCi/L 13.5 13.5 1.00 A E7376-396 Milk 1-131 pCi/L 87.9 96.9 0.91 A Ce-141 pCi/L not provided by Analytics for this study Cr-51 pCi/L 389 456 0.85 A Cs-134 pCi/L 137 157 0.87 A Cs-137 pCi/L 172 186 0.92 A Co-58 pCi/L 84.3 90.2 0.93 A Mn-54 pCi/L 120 120 1.00 A Fe-59 pCi/L 134 131 1.02 A Zn-65 pCi/L 162 174 0.93 A Co-60 pCi/L 284 301 0.94 A E7378-396 AP Ce-141 pCi not provided by Analytics for this study Cr-51 pCi 387 365 1.06 A Cs- 134 pCi 135 126 1.07 A Cs-137 pCi 157 149 1.05 A Co-58 pCi 73.6 72.3 1.02 A Mn-54 pCi 88.7 96 0.92 A Fe-59 pCi 127 105 1.21 W Zn-65 pCi 151 139 1.09 A Co-60 pCi 249 241 1.03 A D-2 96 of 208

TABLE D-1 ANALYTICS ENVIRONMENTAL RADIOACTIVITY CROSS CHECK PROGRAM TELEDYNE BROWN ENGINEERING, 2010 (PAGE 3 OF 3)

Identification Reported Known Ratio (c)

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

December 2010 E7377-396 Charcoal 1-131 pCi 79.6 84.2 0.95 A (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 measurementsmade during standardpreparation.

(c) Ratio of Teledyne Brown Engineeringto Analytics results.

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

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

D-3 97 of 208

TABLE D-2 ERA ENVIRONMENTAL RADIOACTIVITY CROSS CHECK PROGRAM TELEDYNE BROWN ENGINEERING, 2010 (PAGE 1 OF 1)

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

May 2010 RAD-81 Water Sr-89 pCi/L 64.4 60.4 48.6 - 68.2 A Sr-90 pCi/L 37.8 41.3 30.4 - 47.4 A Ba-1 33 pCi/L 66.4 65.9 54.9 - 72.5 A Cs-1 34 pCi/L 66.43 71.6 58.4 - 78.8 A Cs-1 37 pCi/L 137.33 146 131 - 163 A Co-60 pCi/L 83.33 84.5 76.0 - 95.3 A Zn-65 pCi/L 177 186 167 - 219 A Gr-A pCi/L 26.37 32.9 16.9 -42.6 A Gr-B pCi/L 28.77 37.5 24.7 - 45.0 A 1-131 pCi/L 26.27 26.4 21.9 - 31.1 A H-3 pCi/L 12967 12400 10800- 13600 A November 2010 RAD-83 Water Sr-89 pCi/L 77.8 68.5 55.8 - 76.7 N (1)

Sr-90 pCi/L 39.3 43.0 31.7 - 49.3 A Ba-133 pCi/L 70.3 68.9 57.5 - 75.8 A Cs-134 pCi/L 39.9 43.2 34.5 - 47.5 A Cs-137 pCi/L 117 123 111 -138 A Co-60 pCi/L 53.5 53.4 48.1 -61.3 A Zn-65 pCi/L 11.0 102 91.8 - 122 N (2)

Gr-A pCi/L 35.1 42.3 21.9 -53.7 A Gr-B pCi/L 35.5 36.6 24.0 - 44.2 A 1-131 pCi/L 27.9 27.5 22.9 - 32.3 A H-3 pCi/L 13233 12900 11200 - 14200 A (1) Sr-89 TBE to known ratio of 1. 14 fell within acceptable range of +/- 20%. No action required.NCR 10-09 (2) Zn-65 result of 111 was incorrectly reported as 11. 0. No action required. NCR 10-09 (a) Teledyne Brown Engineering reportedresult.

(b) The ERA known value is equal to 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.

D-4 98 of 208

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

TELEDYNE BROWN ENGINEERING, 2010 (PAGE 1 OF 2)

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

March 2010 10-MaW22 Water Cs-134 Bq/L -0.0942 (1) A Cs-1i37 Bq/L 58.5 60.6 42.4 - 78.8 A Co-57 Bq/L 27.2 28.3 19.8-36.8 A Co-60 Bq/L 0.0226 (1) A H-3 Bq/L 104 90.8 63.6 - 118.0 A Mn-54 Bq/L 26.6 26.9 18.8- 35.0 A Sr-90 Bq/L 0.1029 (1) A Zn-65 Bq/L 42.0 40.7 28.5 - 52.9 A 10-GrW22 Water Gr-A Bq/L 0.5173 0.676 1.352 A Gr-B Bq/L 3.98 3.09 1.55 -4.64 A 10-MaS22 Soil Cs-1 34 Bq/kg 665 733 513- 953 A Cs-1 37 Bq/kg 800 779 545- 1013 A Co-57 Bq/kg 508 522 365 - 679 A Co-60 Bq/kg 648 622 435 - 809 A Mn-54 Bq/kg 893 849 594-1104 A K-40 Bq/kg 597 559 391 - 727 A Sr-90 Bq/kg 221 288 202 - 374 W Zn-65 Bq/kg -4.97 (1) A 10-RdF22 AP Cs-134 Bq/sample 1.81 2.13 1.49-2.77 A Cs-137 Bq/sample 1.70 ,1.53 1.07- 1.99 A Co-57 Bq/sample 0.0056 (1) A Co-60 Bq/sample 2.65 2.473 1.731 - 3.215 A Mn-54 Bq/sample 3.70 3.02 2.11 -3.93 W Sr-90 Bq/sample 0.0523 (1) A Zn-65 Bq/sample -0.0627 (1) A 10-GrF22 AP Gr-A Bq/sample 0.1533 0.0427 0.854 A Gr-B Bq/sample 1.240 1.29 0.65- 1.94 A 10-RdV22 Vegetation Cs-1 34 Bq/sample 4.48 4.39 3.07 - 5.71 A Cs-1 37 Bq/sample 3.43 3.06 2.14-3.98 A Co-57 Bq/sample -0.0117 (1) A Co-60 Bq/sample 3.55 3.27 2.29 - 4.25 A Mn-54 Bq/sample 0.007 (1) A Sr-90 Bq/sample -0.0002 (1) A Zn-65 Bq/sample 8.12 7.10 4.97 - 9.23 A September 2010 10-MaW23 Water Cs-134 Bq/L 27.1 31.4 22.0 -40.8 A Cs-137 BqeL 41.8 44.2 30.9 - 57.5 A Co-57 Bq/L 33.2 36.0 25.2 -46.8 A Co-60 Bq/L 26.5 28.3 19.8-36.8 A H-3 Bq/L 500 453.4 317.4 - 589.4 A Mn-54 Bq/L 0.024 (1) A Sr-90 Bq/L 8.10 8.3 5.8- 10.8 A Zn-65 Bq/L 30.8 31.0 21.7-40.3 A 10-GrW23 Water Gr-A Bq/L 2.36 1.92 0.58 - 3.26 A Gr-B Bq/L 6.37 4.39 2.20 - 6.59 A D-5 99 of 208

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

TELEDYNE BROWN ENGINEERING, 2010 (PAGE 2 OF 2)

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

September 2010 10-MaS23 Soil Cs-134 Bq/kg 837 940 658-1222 A Cs-137 Bq/kg 680 670 469-871 A Co-57 Bq/kg 2.78 (1) A Co-60 Bq/kg 350 343 240-446 A Mn-54 Bq/kg 853 820 574-1066 A K-40 Bq/kg 721 699 489 - 909 A Sr-90 Bq/kg 2.24 (1) A Zn-65 Bq/kg 287 265 186-345 A 10-RdF23 AP Cs-134 Bq/sample 2.31 2.98 2.09 - 3.87 W Cs-1 37 Bq/sample -0.025 (1) A Co-57 Bq/sample 3.64 4.08 2.86 - 5.380 A Co-60 Bq/sample 2.81 2.92 2.04 - 3.80 A Mn-54 Bq/sample 3.19 3.18 2.23-4.13 A Sr-90 Bq/sample 1.01 1.01 0.71 - 1.31 A Zn-65 Bq/sample 0.0310 (1) A 10-GrF23 AP Gr-A Bq/sample 0.004 (1) A Gr-B Bq/sample 0.473 0.50 0.25 - 0.75 A 10-RdV23 Vegetation Cs-1 34 Bq/sample 4.90 4.79 3.35 - 6.23 A Cs-1 37 Bq/sample 6.78 5.88 4.12 - 7.64 A Co-57 Bq/sample 10.2 8.27 5.79 - 10.75 W Co-60 Bq/sample 0.00 (1) A Mn-54 Bq/sample 7.36 6.287 4.401 - 8.173 A Sr-90 Bq/sample 2.53 2.63 1.84-3.42 A Zn-65 Bq/sample 6.40 5.3900 3.77 - 7.01 A (1) False positive test (a) Teledyne Brown Engineering reported result.

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

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

D-6 100 of 208

APPENDIX E EFFLUENT REPORT 101 of 208

102 of 208 TABLE OF CONTENTS S UMMA R Y ........................................................................................................................... I INTR O DUCT ION ................................................................................................................. 2 1.0. EFFLUENTS ................................................................................................ 3 1.1. Gaseous Effluents to the Atmosphere ............................................. 3 1.2. Liquids Released to Rock River ........................................................ 3 2.0. SOLID RADIOACTIVE W ASTE ................................................................... 4 3.0. DOSE TO MAN ............................................................................................ 4 3.1. Gaseous Effluent Pathways ............................................................. 4 3.1.1. Noble Gases ....................................................................... 4 3.1.1.1. Gamma Dose Rates .............................................. 4 3.1.1.2. Beta Air and Skin Dose Rate ................................ 4 3.1.2. Radioactive Iodine & Particulate ......................................... 5 3.2. Liquid Effluent Pathways ................................................................... 6 3.3. Total Dose ......................................................................................... 6 3.4. Assessment of Dose to Member of Public ......................................... 6 4.0. SITE METEOROLOGY ................................................................................ 7 103 of 208

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 fflue nts ......................................................................... E -1.4 Table 3.1-1 Maximum Doses Resulting from Airborne Releases ................ E-1.6 Table 3.2-1 Maximum Doses Resulting from Liquid Discharges ................. E-1.10 Table 3.4-1 Maximum Doses Resulting from Airborne Releases Based On Concurrent Meteorological Data ......................................... E-1.11 ii 104 of 208

SUMMARY

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

The Total Effective Dose Equivalent (TEDE) due to licensed activities at Byron Station calculated for the maximum exposed individual for the period is 2.60E-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 2010.

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.

105 of 208

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. C-14 concentration in offsite areas is calculated based on industry-approved methodology for estimation of the amount released and meteorological data.

Environmental monitoring is conducted by sampling at indicator and control (background) locations in the vicinity of Byron Station to measure changes in radiation or radioactivity levels that may be attributable to station operation. If significant changes attributable to Byron Station are measured, these changes are correlated with effluent releases. An environmental monitoring program is conducted which also includes all potential pathways at the site. Gaseous pathways include ground plane (direct), inhalation, vegetation, meat, and milk.

Liquid pathways include potable water and freshwater fish. The critical pathway for 2010 gaseous dose was vegetation. The critical pathway for 2010 liquid dose was freshwater fish.

106 of 208

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 7.88E-01 curies of fission and activation gases were released with a maximum average quarterly release rate of 3.92E-02 pCi/sec.

A total of 6.98E-06 curies of 1-131 were released during the year with a maximum average quarterly release rate of 8.88E-07 pCi/sec.

A total of 7.90E-05 curies were released as airborne particulate matter with a maximum average quarterly release rate of 3.97E-06 pCi/sec.

Gross alpha-emitting radionuclides were below detectable limits.

A total of 8.91 E+00 curies of other (C-14, Br-82) radioisotopes were released with a maximum average quarterly release rate of 2.82E-01 pCi/sec.

A total of 6.16E+01 curies of tritium were released with a maximum average quarterly release rate of 2.39E+00 pCi/sec.

1.2 Liquids Released to Rock River A total of 2.82E+10 liters of radioactive liquid wastes containing 1.1OE-02 curies of fission and activation products were discharged with a maximum quarterly average concentration of 1.23E-09 pCi/ml.

A total of 2.04E+03 curies of tritium were discharged with a maximum quarterly average concentration of 2.30E-04 uCi/ml.

A total of 1.07E-03 curies of dissolved and entrained gases were discharged with a maximum quarterly average concentration of 3.24E-10 uCi/ml.

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

107 of 208

2.0 SOLID RADIOACTIVE WASTE Solid radioactive wastes were shipped by truck. For detail, refer to Byron Station 2010 Annual Radiological Effluent Release Report.

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 gamma air dose was 4.58E-05 mrad, and 9.07E-06 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/cm2 and an occupancy factor of 1.0 is used. The skin dose based on concurrent meteorological data for the year was 1.13E-05 mrem.

108 of 208

The maximum offsite beta air dose for the year based on measured effluents and average meteorological data was 1.37E-05 mrad. The beta air dose based on concurrent meteorological data was 1.13E-05 mrad.

3.1.2 Radioactive Iodine & Particulate The human thyroid exhibits a significant capacity to concentrate ingested or inhaled iodine. 1-131 released during routine operation of the station may be made available to man resulting in a dose to the thyroid. C-14 is also included in this category. C-14 exhibits a capacity to concentrate in bone. C-14 is released in gaseous form and is absorbed into vegetation through photosynthesis. The principal pathways of interest for C-14 are the consumption of vegetation by humans and milk from which animals have ingested C-14 through the consumption of vegetation. With the addition of C-14 to plant effluents, human dose in this category is primarily driven by the release of C-14 from the plant.

The hypothetical dose to the maximum exposed individual living near the station via ingestion of milk and vegetation was calculated. The source of milk and vegetation was assumed to be at the nearest site boundary with the cows pastured and vegetation grown from May through October.

The maximum dose from radioactive iodine and particulate (including C-14) to any organ was 7.26E-01 mrem (child/bone) based on measured effluents and average meteorological data and 7.53E-01 mrem based on concurrent meteorological data. The maximum dose from radioactive iodine and particulate (including C-14) to the whole body was 1.49E-01 mrem (child) based on measured effluents and average meteorological data and 1.55E-01 mrem based on concurrent meteorological data.

3.13 Gaseous Total Dose The maximum total dose from gaseous releases to any organ was 7.26E-01 mrem (child/bone). The maximum total dose from gaseous releases to the whole body was 1.49E-01 mrem (child).

109 of 208

3.2 Liquid Effluent Pathways The principal pathways through the aquatic environment for potential doses to man from liquid waste are ingestion of potable water and eating aquatic foods. Liquid dose was calculated based on the ingestion of potable water and sport fish. It should be noted, however, there were no communities within 10 km downstream of the plant using the Rock River for drinking water. NRC-developed equations were used to calculate the doses to the whole body, bone, liver, thyroid, kidney, lung, lower GI tract, and skin. Specific parameters for use in the equations are given in the Exelon Offsite Dose Calculation Manual (ODCM). The maximum dose from liquid releases to any organ was 1.59E-01 mrem (adult/gilli). The maximum dose from liquid releases to the whole body was 1.32E-01 mrem (adult).

3.3 Total Dose The maximum total dose to any organ via both gaseous and liquid effluents to any organ is 7.29E-01 mrem (child/bone). The maximum dose to the whole body via both gaseous and liquid effluents is 2.60E-01 mrem (child).

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

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

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

The RETS limits on dose to a member of the public due to radioactive iodine & particulate with half-lives greater than eight days in gaseous effluents released from each reactor is 7.5 mrem to any organ during any calendar quarter and 15 mrem during a calendar year.

110 of 208

The 10CFR20 limit on Total Effective Dose Equivalent to individual members of the public is 100 mrem during a calendar year.

4.0 SITE METEOROLOGY Detailed records of the site meteorological measurements taken during each calendar quarter of the year are maintained by the meteorological vendor, retained on site, and are available upon request. The data are presented as cumulative joint frequency distributions of the wind direction for the 250' level and wind speed class by atmospheric stability class determined from the temperature difference between the 250' and 30' levels. Data recovery for all measurements on the meteorological tower was 99.9% during 2010.

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Intentionally left blank 112 of 208

APPENDIX E-1 DATA TABLES AND FIGURES E-1.1 113 of 208

114 of 208 Table 1.1-1 Byron Station Unit One 2010 EFFLUENT AND WASTE DISPOSAL REPORT TABLE 1A GASEOUS EFFLUENTS - SUMMATION OF ALL RELEASES Unit 1 REPORT FOR 2010 Units QTR 1 QTR 2 QTR 3 QTR 4 YEAR Fission and Activation Gases

1. Total Release Ci 4.34E-02 8.69E-02 1.61E-01 9.18E-02 3.83E-01

2. Avg. Release Rate uCi/sec 5.58E-03 1.10E-02 2.03E-02 1.15E-02 1.21E-02 Iodine-131

1. Total Release Ci (1) 4.42E-06 (1) (1) 4.42E-06

2. Avg. Release Rate uCi/sec (1) 5.62E-07 (1) (1) 1. 40E-07 Particulates Half Life >= 8 days

1. Total Release Ci 1.22E-05 7.60E-06 2.85E-06 (1) 2 .26E-05

2. Avg. Release Rate uCi/sec 1.57E-06 9.67E-07 3.59E-07 (1) 7.18E-07 Others

1. Total Release Ci 1.10E+00 1.lIE+00 1.12E+00 1.12E+00 4.46E+00

2. Avg. Release Rate uCi/sec 1.41E-01 1.41E-01 1.41E-01 1.41E-01 1.41E-01 Tritium

1. Total Release Ci 7.21E+00 7.36E+00 1.77E+00 3.59E+00 1.99E+01

2. Avg. Release Rate uCi/sec 9.27E-01 9.36E-01 2.23E-01 4.52E-01 6.32E-01 Gross Alpha

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

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

(1) Less than minimum detectable activity which meets the lower limit of detection (LLD) requirements of TRM Section 3.11 E- 1.2 115 of 208

Table 1.1-1 (cont.)

Byron Station Unit Two 2010 EFFLUENT AND WASTE DISPOSAL REPORT TABLE 1A GASEOUS EFFLUENTS - SUMMATION OF ALL RELEASES Unit 2 REPORT FOR 2010 Units QTR 1 QTR 2 QTR 3 QTR 4 YEAR Fission and Activation Gases

1. Total Release Ci 8.26E-02 8.79E-02 1.50E-01 8.49E-02 4.05E-01

2. Avg. Release Rate uCi/sec 1.06E-02 1.12E-02 1.89E-02 1.07E-02 1.28E-02 Iodine-131

1. Total Release Ci (1) 2.56E-06 (1) (1) 2. 56E-06

2. Avg. Release Rate uCi/sec (1) 3.26E-07 (1) (1) 8. 13E-08 Particulates Half Life >= 8 days

1. Total Release Ci 4.67E-07 1.OOE-05 1.43E-05 3.16E-05 5.64E-05

2. Avg. Release Rate uCi/sec 6.01E-08 1.28E-06 1.80E-06 3.97E-06 1.79E-06 Others

1. Total Release Ci 1.10E+00 1.lIE+00 1.12E+00 1.12E+00 4.45E+00

2. Avg. Release Rate uCi/sec 1.41E-01 1.41E-01 1.41E-01 1.41E-01 1.41E-01 Tritium

1. Total Release Ci 1.13E+01 5.84E+00 1.17E+01 1.29E+01 4.17E+01

2. Avg. Release Rate uCi/sec 1.46E+00 7.43E-01 1.47E+00 1.62E+00 1.32E+00 Gross Alpha

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

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

(1) Less than minimum detectable activity which meets the lower limit of detection (LLD) requirements of TRM Section 3.11 E-1.3 116 of 208

Table 1.2-1 Byron Station Unit One 2010 EFFLUENT AND WASTE DISPOSAL REPORT TABLE 2A LIQUID EFFLUENTS - SUMMATION OF ALL RELEASES Unit 1 REPORT FOR 2010 Units QTR 1 QTR 2 QTR 3 QTR 4 YEAR Fission and Activation Products

1. Total Release Ci 2.05E-03 1.67E-03 1.32E-03 4.77E-04 5.52E-03

2. Avg. Diluted Conc. uCi/ml 6.13E-10 5.38E-10 3.41E-10 1.25E-10 3.91E-10 Tritium

1. Total Release Ci 3.83E+02 3.25E+02 5.88E+01 2.52E+02 1.02E+03

2. Avg. Diluted Conc. uCi/ml 1.15E-04 1.04E-04 1.52E-05 6.61E-05 7.20E-05 Dissolved and Entrained Gases

1. Total Release Ci 1.50E-05 5.05E-04 (1) 1.32E-05 5.33E-04

2. Avg. Diluted Conc. uCi/ml 4.50E-12 1.62E-10 (1) 3.46E-12 3.77E-11 Gross Alpha Radioactivity

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

2. Avg. Diluted Conc. uCi/ml (1) (1) (1) (1) (1)

Volume of liquid waste liters 3.34E+09 3.11E+09 3.87E+09 3.80E+09 1.41E+10 (1) Less than minimum detectable activity which meets the lower limit of detection (LLD) requirements of TRM Section 3.11 E-I1.4 117 of 208

Table 1.2-1 (cont.)

Byron Station Unit Two 2010 EFFLUENT AND WASTE DISPOSAL REPORT TABLE 2A LIQUID EFFLUENTS - SUMMATION OF ALL RELEASES Unit 2 REPORT FOR 2010 Units QTR 1 QTR 2 QTR 3 QTR 4 YEAR Fission and Activation Products

1. Total Release Ci 2.05E-03 1.67E-03 1.32E-03 4.77E-04 5.52E-03

2. Avg. Diluted Conc. uCi/ml 6.13E-10 5.38E-10 3.41E-10 1.25E-10 3.91E-10 Tritium

1. Total Release Ci 3.83E+02 3.25E+02 5.88E+01 2.52E+02 1.02E+03

2. Avg. Diluted Conc. uCi/ml 1.15E-04 1.04E-04 1.52E-05 6.61E-05 7.20E-05 Dissolved and Entrained Gases

1. Total Release Ci 1.50E-05 5.05E-04 (1) 1.32E-05 5.33E-04

2. Avg. Diluted Conc. uCi/ml 4.50E-12 1.62E-10 (1) 3.46E-12 3.77E-11 Gross Alpha Radioactivity

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

2. Avg. Diluted Conc. uCi/ml (1) (1) (1) (1) (1)

Volume of liquid waste liters 3.34E+09 3.11E+09 3.87E+09 3.80E+09 1.41E+10 (1) Less than minimum detectable activity which meets the lower limit of detection (LLD) requirements of TRM Section 3.11 E-1.5 118 of 208

Table 3.1-1 Byron Station 2010 40CFR190 URANIUM FUEL CYCLE DOSE REPORT GASEOUS DOSE

SUMMARY

Unit 1 & 2 Report for: 2010 Unit Range - From: 1 To: 2 I&P DOSE LIMIT ANALYSIS ANNUAL 2010----------

Age Dose Limit Max % of Annual - Limit Group Organ (mrem) (mrem) Limit 2010 - Admin. Any Organ CHILD BONE 7.26E-01 1.13E+01 6.45E+00 2010 - Admin. Total Body CHILD TBODY 1.49E-01 1.05E+01 1.42E+00 2010 - T.Spc. Any Organ CHILD BONE 7.26E-01 1.50E+01 4.84E+00 Receptor: 5 Composite Crit. Receptor - IP Distance: 0.00 (meters) Compass Point: NA Critical Pathway: Vegetation Major Contributors ( 0% or greater to total)

Nuclide Percentage H-3 0.OOE+00 C-14 1.OOE+02 CO-58 1.90E-06 CO-60 3.15E-02 1-131 1.70E-04 1-132 4.08E-06 2010 - T.Spc. Total Body CHILD TBODY 1.49]E-01 1.50E+01 9.92E-01 Receptor: 5 Composite Crit. Receptor - IP Distance: 0.00 (meters) Compass Point: NA Critical Pathway: Vegetation Major Contributors (0% or greater to total)

Nuclide Percentage H-3 2.34E+00 C-14 9.75E+01 CO-58 1. 62E-05 CO-60 1. 63E-01 1-131 4.79E-04 1-132 1 . 95E-05 E-1.6 119 of 208

Table 3.1-1 (cont.)

Byron Station 2010 40CFR190 URANIUM FUEL CYCLE DOSE REPORT GASEOUS DOSE

SUMMARY

Unit 1 & 2 Report for: 2010 Unit Range - From: 1 To: 2 NG DOSE LIMIT ANALYSIS ANNUAL 2010 Dose Limit Max % of Annual - Limit (mrad) (mrad) Limit 2010 - Admin. Gamma 4.58E-05 7.50E+00 6. 10E-04 2010' - Admin. Beta 1.37E-05 1.50E+01 9. 10E-05 2010 - T.Spc. Gamma 4.58E-05 1.OOE+01 4.58E-04 Receptor: 4 Composite Crit. Receptor - NG Distance: 0.00 (meters) Compass Point: NA Nuclide Percentage AR-41 6.47E+01 KR-85M 6.46E-02 XE-135 6.65E-01 XE-133M 1.67E-01 KR-88 1.93E+00 XE-133 3.24E+01 2010 - T.Spc. Beta 1.37E-05 2.OOE+01 6.83E-05 Receptor: 4 Composite Crit. Receptor - NG Distance: 0.00 (meters) Compass Point: NA Nuclide Percentage AR-41 1. 88E+01 KR-85M 8 . 52E-02 XE-135 7. 02E-01 XE-133M 6.23E-01 KR-88 3. 07E-01 XE-133 7. 95E+01 E-1.7 120 of 208

40CFR190 URANIUM FUEL CYCLE DOSE REPORT Unit 1 & 2 Report for: 2010 Unit Range - From: 1 To: 2 MAXIMUM DOSE ANALYSIS ANNUAL 2010 Age Dose Dose Type Group Organ (mrem)

Any Organ CHILD BONE 7.29E-01 Liquid Receptor: 0 Liquid Receptor Gaseous Receptor: 5 Composite Crit. Receptor - IP Distance: 0.00 (meters) Compass Point: NA Liquid Dose: 2.97E-03 % of Total: 4.07E-01 Critical Pathway: Fresh Water Fish - Sport (FFSP)

Major Contributors (0% or greater to total)

Nuclide Percentage H-3 0.OOE+00 CR-51 0.OOE+00 MN-54 0.00E+00 FE-59 1.44E+00 CO-58 0.OOE+00 CO-60 0.OOE+00 NB-95 1.22E-01 TE-125M 9.82E+01 TE-132 2.91E-01 1-132 1.12E-03 Gaseous Dose: 7.26E-01 % of Total: 9.95E+01 Critical Pathway: Vegetation (VEG)

Major Contributors (0% or greater to total)

Nuclide Percentage H-3 0.OOE+00 C-14 1.00E+02 CO-58 1.90E-06 CO-60 3.15E-02 1-131 1.70E-04 1-132 4.08E-06 E-1.8 121 of 208

40CFR190 URANIUM FUEL CYCLE DOSE REPORT Unit 1 & 2 MAXIMUM DOSE ANALYSIS ANNUAL 2010 Age Dose Dose Type Group Organ (mrem)

Total Body CHILD TBODY 2.60E-01 Liquid Receptor: 0 Liquid Receptor Gaseous Receptor: 5 Composite Crit. Receptor - IP Distance: 0.00 (meters) Compass Point: NA Liquid Dose: 1.llE-01 % of Total: 4.27E+01 Critical Pathway: Fresh Water Fish - Sport (FFSP)

Major Contributors (0% or greater to total)

Nuclide Percentage H-3 9.87E+01 CR-51 1.24E-04 MN-54 1 .07E-02 FE-59 3. 09E-02 CO-58 5. 68E-01 CO-60 3. 54E-01 NB-95 9 .04E-04 TE-125M 3. 50E-01 TE-132 4.16E-03 1-132 2.53E-05 Gaseous Dose: 1.49E-01 % of Total: 5.72E+01 Critical Pathway: Vegetation (VEG)

Major Contributors (0% or greater to total)

Nuclide Percentage H-3 2.34E+00 C-14 9.75E+01 CO-58 1.62E-05 CO-60 1.63E-01 1-131 4.79E-04 1-132 1.95E-05 E-1.9 122 of 208

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

SUMMARY

Unit 1 & 2 2010 Report for: 2010 Unit Range - From: 1 To: 2 Liquid Receptor PERIOD DOSE BY ORGAN AND AGE GROUP (mrem) ANNUAL 2010 Agegrp Bone Liver Thyroid Kidney Lung GI-LLI Skin TB ADULT 2.13E-03 1.32E-01 1.32E-01 1.40E-01 1.31E-01 1.59E-01 0.OOE+00 1.32E-01 TEEN 2.31E-03 9.97E-02 9.89E-02 9.84E-02 9.83E-02 1.18E-01 0.OOE+00 9. 96E-02 CHILD 2.97E-03 1.lIE-01 1.10E-01 1.10E-01 1.10E-01 1.17E-01 0.OOE+00 1.lIE-01 INFANT 7.51E-06 4.86E-02 4.86E-02 4.86E-02 4.86E-02 4.86E-02 0.00E+00 4 .86E-02 SITE DOSE LIMIT ANALYSIS ANNUAL 2010 Age Dose Limit Max % of Annual - Limit Group Organ (mrem) (mrem) Limit 2010 - Admin. Any Organ ADULT GILLI 1.59E-0 )1 7.50E+00 2. 11E+00 2010 - Admin. Total Body ADULT TBODY 1.32E-0 )1 2.25E+00 5. 88E+00 2010 - T.Spc. Any Organ ADULT GILLI 1.59E-01 1.OOE+01 1.59E+00 Critical Pathway: Fresh Water Fish - Sport (FFSP)

Major Contributors (0% or greater to total)

Nuclide Percentage H-3 8.26E+01 CR-51 1.98E-02 MN-54 1.12E-01 FE-59 1.68E-01 CO-58 3.29E+00 CO-60 1.93E+00 NB-95 6.46E+00 TE-125M 5.25E+00 TE-132 1.26E-01 1-132 7.95E-06 2010 - T.Spc. Total Body ADULT TBODY 1.32E-01 3.OOE+00 4.41E+00 Critical Pathway: Fresh Water Fish - Sport (FFSP)

Major Contributors ( 0% or greater to total)

Nuclide Percentage H-3 9.90E+01 CR-51 9.44E-05 MN-54 8.33E-03 FE-59 2.31E-02 CO-58 4.37E-01 CO-60 2.72E-01 NB-95 6.86E-04 TE-125M 2.lIE-01 TE-132 3.01E-03 1-132 1.77E-05 E-1-10 123 of 208

Table 3.4-1 The following are the maximum annual calculated cumulative offsite doses resulting from Byron airborne releases in 2010 based on concurrent meteorological data:

Unit 1:

Dose Maximum Value Sector Affected gamma air (1) 4.080 x 10-6 mrad South-Southeast beta air (2) 5.300 x 10-6 mrad South-Southeast whole body (3) 7.675 x 10-2 mrem South-Southeast skin (4) 5.230 x 10-6 mrem South-Southeast 10-1 organ (5) (child-bone) 3.767 x mrem South-Southeast Unit 1 Compliance Status 10 CFR 50 Appendix I Yearly Objective % of Appendix I gamma air 10.0 mrad 0.00 beta air 20.0 mrad 0.00 whole body 5.0 mrem 1.54 skin 15.0 mrem 0.00 organ 15.0 mrem 2.51 Unit 2:

Dose Maximum Value Sector Affected gamma air (1) 4.870 x 10-6 mrad South-Southeast beta air (2) 5.730 x 10-6 mrad South-Southeast whole body (3) 7.812 x 10-2 mrem South-Southeast 10-6 skin (4) 6.090 x mrem South-Southeast organ (5) (child-bone) 3.762 x 10-1 mrem South-Southeast Unit 2 Compliance Status 10 CFR 50 Appendix I Yearly Objective % of Appendix I gamma air 10.0 mrad 0.00 beta air 20.0 mrad 0.00 whole body 5.0 mrem 1.56 skin 15.0 mrem 0.00 organ 15.0 mrem 2.51 (1) Gamma Air Dose - GASPAR II, NUREG-0597 (2)

Beta Air Dose - GASPAR II, NUREG-0597 (3)

Whole Body Dose - GASPAR II, NUREG-0597 (4) Skin Dose - GASPAR II, NUREG-0597 (5) Inhalation and Food Pathways Dose - GASPAR II, NUREG-0597 Data recovery: 99.9%

E-1.ll 124 of 208

APPENDIX F METEOROLOGICAL DATA 125 of 208

126 of 208 Byron Generating Station Period of Record: January - March 2010 Stability Class - Extremely Unstable - 250Ft-3OFt Delta-T (F)

Winds Measured at 30 Feet Wind SpE*ed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 0 0 0 0 0 0 0 NNE 0 0 0 0 0 0 0 NE 0 0 0 0 0 0 0 ENE 0 0 0 0 0 0 0 E 0 0 0 0 0 0 0 ESE 0 0 0 0 0 0 0 SE 0 0 0 0 0 0 0 SSE 0 0 0 0 0 0 0 S 0 0 0 0 0 0 0 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 0 0 0 0 0 WNW 0 0 0 0 0 0 0 NW 1 1 0 0 2 0 0 NNW 0 0 0 0 0 0 0 Variable 0 0 0 0 0 Total 1 1 0 0 0 0 2 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 3 F-I 127 of 208

Byron Generating Station Period of Record: January - March 2010 Stability Class - Moderately Unstable - 250Ft-3OFt Delta-T (F)

Winds Measured at 30 Feet Wind Sp*eed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total 0 0 N 0 0 0 0 0 0 0 NNE 0 0 0 0 0 1 0 NE 0 0 0 0 1 0 ENE 0 0 0 0 1 E 0 0 0 0 0 0 0 ESE 0 0 1 0 0 0 2 01 SE 0 0 1 0 0 0 1 SSE 0 0 0 0 0 0 0 S 0 0 1 1 0 0 20 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 0 1 0 0 1 WNW 0 0 0 0 0 0 0 NW 0 0 0 0 0 0 0 NNW 0 0 0 0 0 0 0 Variable 0 0 0 0 0 0 0 Total 0 0 5 2 0 0 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability cl asses: 3 F-2 128 of 208

Byron Generating Station Period of Record: January - March 2010 Stability Class - Slightly Unstable - 250Ft-30Ft Delta-T (F)

Winds Measured at 30 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 0 3 0 0 3 NNE 0 0 2 2 0 0 4 NE 0 0 2 ENE 0 0 E 0 ESE SE SSE S

SSW SW WSW W

WNW NW NNW Variable Total 2 11 17 0 31 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 3 F-3 129 of 208

Byron Generating Station Period of Record: January - March 2010 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 7 35 81 20 0 0 143 NNE 5 15 32 68 0 0 120 NE 6 20 16 29 0 0 71 ENE 5 11 14 14 0 0 44 E 7 26 27 1 0 0 61 ESE 2 14 26 8 0 0 50 SE 7 22 25 1 0 0 55 SSE 5 10 10 0 0 0 25 S 5 8 5 12 1 0 31 SSW 4 15 12 7 0 0 38 SW 3 11 19 2 0 0 35 WSW 5 14 27 17 0 0 63 W 11 27 46 37 11 0 132 WNW 8 60 48 7 0 0 123 NW 6 47 70 4 0 0 127 NNW 4 24 61 23 0 0 112 Variable 0 0 0 0 0 0 0 Total 90 359 519 250 12 0 1230 Hours of calm in this stability class: 2 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 3 F-4 130 of 208

Byron Generating Station Period of Record: January - March 2010 Stability Class - Slightly Stable - 250Ft-3OFt Delta-T (F)

Winds Measured at 30 Feet Wind Sp4eed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 3 18 13 3 0 0 37 NNE 5 13 7 0 0 0 25 NE 4 12 6 0 0 0 22 ENE 3 11 16 1 0 0 31 E 6 14 5 0 0 0 25 ESE 4 14 15 15 0 0 48 SE 3 14 14 9 0 0 40 SSE 3 8 11 11 0 0 33 S 3 6 2 5 0 0 16 SSW 4 2 22 2 0 0 30 SW 3 10 8 0 0 0 21 WSW 8 14 7 0 0 0 29 W 7 28 1 0 0 0 36 WNW 16 57 3 0 0 0 76 NW 8 46 14 0 0 0 68 NNW 4 31 19 0 0 0 54 Variable 0 0 0 0 0 0 0 Total 84 298 163 46 0 0 591 Hours of calm in this stability class: 2 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 3 F-5 131 of 208

Byron Generating Station Period of Record: January - March 2010 Stability Class - Moderately Stable - 250Ft-30Ft Delta-T (F)

Winds Measured at 30 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 4 0 0 0 9 NNE 2 0 0 0 8 NE 2 0 0 2 ENE 4 0 0 0 9 E 5 0 0 0 12 ESE 1 2 0 0 15 SE 1 1 0 0 11 SSE 1 0 0 0 18 S 0 0 0 0 1 SSW 3 0 0 0 3 SW 5 8 0 0 0 0 13 WSW 8 3 0 0 0 0 11 W 20 21 0 0 0 0 41 WNW 19 7 0 0 0 0 26 NW 10 12 0 0 0 0 22 NNW 5 6 0 0 0 0 11 Variable 0 0 0 0 0 0 0 Total 90 87 32 3 0 0 212 Hours of calm in this stability class: 2 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 3 F-6 132 of 208

Byron Generating Station Period of Record: January - March 2010 Stability Class - Extremely Stable - 250Ft-30Ft Delta-T (F)

Winds Measured at 30 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 - Total N 1 0 1 NNE 1 0 1 NE 1 0 1 ENE 0 0 0 E 4 0 12 ESE 0 0 4 SE 0 0 0 SSE 1 0 1 S 1 0 1 SSW 1 0 2 SW 1 0 2 WSW 0 0 0 W 9 0 11 WNW 11 0 11 NW 20 3 0 0 0 0 23 NNW 4 2 0 0 0 0 6 Variable 0 0 0 0 0 0 0 Total 55 18 3 0 0 0 76 Hours of calm in this stability class: 2 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 3 F-7 133 of 208

Byron Generating Station Period of Record: January - March 2010 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 FSE 0 0 0 SE 0 0 0 SSE 0 0 0 S 0 0 0 SSW 0 0 0 SW 0 0 0 WSW 0 0 0 W 0 0 0 WNW 0 0 0 NW 0 0 1 NNW 0 0 1 Variable 0 0 0 Total 0 0 2 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 3 F-8 134 of 208

Byron Generating Station Period of Record: January - March 2010 Stability Class - Moderately Unstable - 250Ft-3CFt Delta-T (F)

Winds Measured at 250 Feet Wind Speed (in mph)

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

NNE NE ENE E

ESE SE SSE S

SSW SW WSW W

WNW NW NNW Variable Total Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 3 F-9 135 of 208

Byron Generating Station Period of Record: January - March 2010 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 0 3 0 0 4 NNE 0 0 0 1 1 0 2 NE 0 0 0 4 0 0 4 ENE 0 0 0 0 0 0 0 E 0 0 1 0 0 0 1 ESE 0 0 2 0 0 0 2 SE 0 0 0 4 0 0 4 SSE 0 0 0 0 0 0 0 S 0 0 0 0 2 0 2 SSW 0 0 0 2 2 0 4 SW 0 0 0 0 0 0 0 WSW 0 0 0 0 1 0 1 W 0 0 3 0 3 0 6 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 6 15 9 0 31 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 3 F-10 136 of 208

Byron Generating Station Period of Record: January - March 2010 Stability Class - Neutral - 250Ft-30Ft Delta-T (F)

Winds Measured at 250 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 13 42 53 18 133 NNE 12 19 43 56 136 NE 9 13 25 28 84 ENE 10 12 9 11 45 E 15 18 21 9 66 ESE 3 12 23 5 47 SE 4 20 18 1 51 SSE 12 12 5 1 34 S 4 3 3 7 22 SSW 11 6 14 8 40 SW 6 8 11 3 32 WSW 6 18 28 7 63 W 11 34 33 23 112 WNW 29 49 25 4 113 NW 37 45 57 2 144 NNW 10 33 50 15 109 Variable 0 0 0 0 0 Total 56 192 344 418 198 23 1231 Hours of calm in this stability class: 1 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 3 F-11 137 of 208

Byron Generating Station Period of Record: January - March 2010 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 10 12 26 4 0 52 NNE 1 6 7 16 3 0 33 NE 0 2 16 9 2 0 29 ENE 1 6 12 8 0 0 27 E 2 10 11 1 2 1 40 ESE 0 2 6 1 6 6 33 SE 0 3 9 5 11 14 42 SSE 1 8 5 10 8 8 40 S 0 1 3 0 3 9 16 SSW 5 1 5 14 11 0 36 SW 0 2 2 7 3 0 14 WSW 1 2 6 20 0 0 29 W 2 1 9 2 0 0 14 WNW 3 8 24 8 0 0 43 NW 1 7 29 39 0 0 76 NNW 0 3 17 48 0 0 68 Variable 0 1 0 0 0 0 1 Total 17 73 173 239 53 38 593 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 3 F-12 138 of 208

Byron Generating Station Period of Record: January - March 2010 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 2 13 10 25 NNE 0 1 1 4 6 NE 0 0 3 1 9 ENE 0 2 1 2 6 E 0 6 4 2 14 ESE 1 1 1 0 7 SE 0 2 3 1 15 SSE 0 0 4 5 17 S 0 1 0 5 11 SSW 1 0 1 1 3 SW 0 1 0 1 2 WSW 0 0 4 1 5 W 1 0 5 2 8 WNW 0 1 8 10 19 NW 0 2 20 21 43 NNW 0 1 13 10 24 Variable 0 0 0 0 0 Total 3 20 81 76 26 8 214 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 cl asses: 3 F-13 139 of 208

Byron Generating Station Period of Record: January - March 2010 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 16 NNE 0 NE 1 ENE 0 E 0 ESE 0 SE 0 SSE 0 S 0 SSW 0 SW 0 WSW 0 W 0 WNW 0 NW 0 0 15 NNW 0 0 9 Variable 0 0 0 Total 1 15 26 30 2 4 78 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 3 F-14 140 of 208

Byron Generating Station Period of Record: April - June 2010 Stability Class - Extremely Unstable - 250Ft-30Ft Delta-T (F)

Winds Measured at 30 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total 0 0 1 N 0 0 0 1 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 1 E 0 0 0 0 0 0 ESE 0 0 0 0 0 0 0 SE 0 0 0 0 0 0 0 SSE 0 0 0 0 0 0 0 S 0 0 0 0 0 0 0 SSW 0 0 0 0 0 0 0 0 SW 0 0 0 0 0 0 WSW 1 0 0 1 0 0 0 W 3 4 0 7 0 0 0 WNW 0 0 0 0 0 0 0 NW 2 0 0 2 0 0 0 NNW 3 0 0 3 0 0 0 Variable 0 0 0 0 Total 0 0 2 9 4 0 15 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: 7 F-15 141 of 208

Byron Generating Station Period of Record: April - June 2010 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 6 0 0 0 6 NNE 0 0 3 0 0 0 3 NE 0 0 2 0 0 0 2 ENE 0 0 1 0 0 0 1 E 0 0 8 0 0 0 8 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 0 0 0 0 0 SW 0 0 0 1 0 0 1 WSW 0 0 0 2 0 0 2 W 0 0 1 1 0 0 2 WNW 0 0 0 0 0 0 0 NW 0 1 0 3 0 0 4 NNW 0 0 0 2 0 0 2 Variable 0 0 0 0 0 0 0 Total 0 1 21 9 0 0 31 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 7 F-16 142 of 208

Byron Generating Station Period of Record: April - June 2010 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 NNE 0 NE 0 ENE 0 E 0 ESE 0 SE 0 SSE 0 S 0 SSW 0 SW 0 WSW 0 W 0 WNW 0 NW 0 NNW 0 Variable 0 Total 0 13 35 22 1 1 72 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: 7 F-17 143 of 208

Byron Generating Station Period of Record: April - June 2010 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 5 30 19 9 63 NNE 1 21 28 13 63 NE 3 14 19 9 46 ENE 3 16 25 14 58 E 10 51 41 3 105 ESE 6 20 20 15 69 SE 0 16 7 16 41 SSE 0 21 29 5 58 S 3 12 32 14 77 SSW 0 13 35 14 71 SW 0 14 30 10 57 WSW 3 11 12 5 37 W 3 13 14 21 57 WNW 5 17 34 30 87 NW 1 15 25 14 55 NNW 5 33 19 5 62 Variable 0 1 0 0 1 Total 48 318 389 197 52 3 1007 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: 7 F-I 8 144 of 208

Byron Generating Station Period of Record: April - June 2010 Stability Class - Slightly Stable - 250Ft-30Ft Delta-T (F)

Winds Measured at 30 Feet Wind Sp eed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 3 27 15 0 45 NNE 6 13 8 1 28 NE 7 13 11 3 34 ENE 4 12 20 0 36 E 8 43 24 1 76 ESE 4 15 30 9 67 SE 2 18 23 5 48 SSE 4 18 35 12 69 S 3 25 22 19 70 SSW 1 16 29 11 57 SW 3 22 14 1 40 WSW 10 13 10 4 37 W 5 22 14 0 42 WNW 11 19 15 1 46 NW 9 19 7 0 35 NNW 6 17 3 1 27 Variable 1 1 0 0 2 Total 87 313 280 68 11 0 759 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: 7 F-19 145 of 208

Byron Generating Station Period of Record: April - June 2010 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 8 3 0 0 0 0 11 NNE 5 3 0 0 0 0 8 NE 1 1 1 0 0 0 3 ENE 3 0 1 0 0 0 4 E 7 21 0 0 0 0 28 ESE 7 9 5 0 0 0 21 SE 4 11 2 0 0 0 17 SSE 8 11 15 2 0 0 36 S 8 14 11 1 0 0 34 SSW 6 7 2 0 0 0 15 SW 3 9 0 0 0 0 12 WSW 2 1 0 0 0 0 3 W 4 4 0 0 0 0 8 WNW 9 1 1 0 0 0 11 NW 8 2 0 0 0 0 10 NNW 7 3 0 0 0 0 10 Variable 0 0 0 0 0 0 0 Total 90 100 38 3 0 0 231 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: 7 F-20 146 of 208

Byron Generating Station Period of Record: April - June 2010 Stability Class - Extremely Stable - 250Ft-30Ft Delta-T (F)

Winds Measured at 30 Feet Wind Sp eed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total 0 0 N 2 0 0 0 2 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 1 1 0 0 2 0 0 ESE 1 6 0 0 7 1 1 0 SE 0 0 0 2 1 1 0 SSE 0 0 0 2 1 0 S 3 2 0 0 5 0 0 SSW 5 0 0 0 5 0 0 SW 3 0 0 0 3 0 0 WSW 1 0 0 0 1 0 0 W 2 0 0 0 2 0 0 WNW 7 0 0 0 7 0 0 NW 12 0 0 0 12 0 0 NNW 6 0 0 0 6 0 0 Variable 0 0 0 0 0 Total 43 11 2 0 0 0 56 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: 7 F-21 147 of 208

Byron Generating Station Period of Record: April - June 2010 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

NNE NE ENE E

ESE SE SSE S

SSW SW WSW W

WNW NW NNW Variable Total 0 0 1 3 8 .3 15 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: 7 F-22 148 of 208

Byron Generating Station Period of Record: April - June 2010 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 3 2 N 0 0 0 0 5 3 2 NNE 0 0 0 0 5 0 1 NE 0 0 0 0 1 0 1 ENE 0 0 0 0 1 E 0 0 3 5 0 0 8 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 0 0 0 0 0 SW 0 0 0 0 1 0 1 WSW 0 0 0 1 1 0 2 W 0 0 0 1 1 0 2 WNW 0 0 0 0 0 0 0 NW 0 0 1 0 3 0 4 NNW 0 0 0 0 2 0 2 Variable 0 0 0 0 0 0 0 Total 0 0 10 13 8 0 31 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 7 F-23 149 of 208

Byron Generating Station Period of Record: April - June 2010 Stability Class - Slightly Unstable - 250Ft-30Ft Delta-T (F)

Winds Measured at 250 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 1 1 NNE 0 2 0 NE 0 2 0 ENE 0 1 0 E 0 1 0 ESE 0 1 0 SE 0 0 3 SSE 0 1 0 S 0 1 1 SSW 0 1 SW 0 4 3 WSW 0 0 2 W 0 1 3 WNW 0 0 1 NW 0 0 0 NNW 0 0 1 Variable 0 0 0 Total 0 8 29 16 16 3 72 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: 7 F-24 150 of 208

Byron Generating Station Period of Record: April - June 2010 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 18 25 4 5 1 56 NNE 2 12 16 23 15 0 68 NE 2 8 14 18 8 2 52 ENE 1 8 10 15 11 0 45 E 4 34 37 35 6 1 117 ESE 1 15 12 16 13 13 70 SE 1 12 6 6 11 7 43 SSE 2 10 19 19 4 4 58 S 0 6 12 24 9 18 69 SSW 0 8 29 19 9 12 77 SW 1 8 19 21 9 5 63 WSW 1 3 8 8 4 6 30 W 1 8 15 10 15 7 56 WNW 1 10 18 22 23 3 77 NW 3 10 7 29 13 3 65 NNW 3 20 12 17 6 2 60 Variable 0 1 0 0 0 0 1 Total 26 191 259 286 161 84 1007 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: 7 F-25 151 of 208

Byron Generating Station Period of Record: April - June 2010 Stability Class - Slightly Stable - 250Ft-30Ft Delta-T (F)

Winds Measured at 250 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 1 6 10 19 0 0 36 NNE 1 2 17 19 0 0 39 NE 0 2 8 9 4 0 23 ENE 2 8 12 20 1 0 43 E 2 4 28 29 9 0 72 ESE 1 5 8 24 28 15 81 SE 0 3 6 15 16 4 44 SSE 3 2 4 8 27 8 52 S 0 2 7 22 21 12 64 SSW 0 1 13 36 17 4 71 SW 0 3 5 23 7 0 38 WSW 0 2 19 15 7 0 43 W 1 2 18 23 0 1 45 WNW 0 5 8 19 4 0 36 NW 0 4 15 20 1 0 40 NNW 0 4 12 14 1 0 31 Variable 0 1 0 0 0 0 1 Total 11 56 190 315 143 44 759 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: 7 F-26 152 of 208

Byron Generating Station Period of Record: April - June 2010 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 1 4 1 0 0 7 NNE 0 3 4 2 0 0 9 NE 5 2 0 0 11 ENE 1 1 2 1 0 0 5 E 0 1 6 7 2 0 16 ESE 0 1 10 7 10 1 29 SE 0 1 5 4 2 0 12 SSE 0 1 7 1 5 3 17 S 1 4 2 12 8 6 33 SSW 0 3 7 9 6 2 27 SW 0 2 3 4 0 0 9 WSW 1 1 1 8 0 0 11 W 1 2 5 8 0 0 16 WNW 1 1 1 1 0 0 4 NW 2 2 7 1 0 0 12 NNW 0 6 8 2 0 0 16 Variable 0 0 0 0 0 0 0 Total 8 34 77 70 33 12 234 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: 7 F-27 153 of 208

Byron Generating Station Period of Record: April - June 2010 Stability Class - Extremely Stable - 250Ft-30Ft Delta-T (F)

Winds Measured at 250 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 1 2 NNE 0 2 NE 2 3 ENE 1 1 E 1 3 ESE 0 0 SE 0 0 SSE 0 0 S 0 0 SSW 0 0 SW 0 2 WSW 0 2 W 0 2 WNW 0 2 NW 0 0 NNW 0 2 Variable 0 0 Total 5 21 15 13 2 1 57 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stabili ty class: 0 Hours of missing stability measurements in all sta bility cl asses: 7 F-28 154 of 208

Byron Generating Station Period of Record: July - September 2010 Stability Class - Extremely Unstable - 250Ft-3OFt Delta-T (F)

Winds Measured at 30 Feet Wind Spe _ed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total 1 0 N 0 1 0 0 2 1 1 0 NNE 0 0 0 2 0 0 NE 0 0 0 0 0 0 0 ENE 0 0 0 0 0 0 0 E 0 0 0 0 0 ESE 0 0 5 0 0 0 5 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 1 3 0 0 0 4 SW 0 0 0 0 0 0 0 WSW 0 0 2 0 2 0 4 W 0 0 2 1 5 0 8 WNW 0 0 0 2 0 0 2 NW 0 4 5 0 0 0 9 NNW 0 2 3 0 0 0 5 Variable 0 0 0 0 0 0 0 Total 0 9 22 3 7 0 41 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 3 F-29 155 of 208

Byron Generating Station Period of Record: July - September 2010 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 1 0 0 0 3 NNE 0 1 2 0 0 0 3 NE 0 0 1 0 0 0 1 ENE 0 1 1 0 0 0 2 E 0 3 0 0 0 0 3 ESE 0 1 1 0 0 0 2 SE 0 0 2 0 0 0 2 SSE 0 0 0 0 0 0 0 S 0 0 0 0 0 0 0 SSW 0 0 2 0 0 0 2 SW 0 1 3 0 0 0 4 WSW 0 1 0 0 0 0 1 W 0 0 2 0 1 0 3 WNW 0 0 1 2 0 0 3 NW 0 1 1 2 0 0 4 NNW 0 1 3 0 0 0 4 Variable 0 1 0 0 0 0 1 Total 0 13 20 4 1 0 38 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 3 F-30 156 of 208

Byron Generating Station Period of Record: July - September 2010 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 0 3 NNE 0 0 1 NE 0 0 0 ENE 0 0 1 E 0 0 4 ESE 0 0 2 SE 0 0 3 SSE 0 0 1 S 0 0 10 SSW 0 0 7 SW 0 3 6 1 0 0 10 WSW 0 1 2 2 1 0 6 W 0 4 2 0 0 0 6 WNW 0 0 5 2 2 0 9 NW 0 5 5 0 0 0 10 NNW 0 2 0 1 0 0 3 Variable 1 0 0 0 0 0 1 Total 1 26 40 7 3 0 77 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stabili ty class: 0 Hours of missing stability measurements in all sta bility classes: 3 F-31 157 of 208

Byron Generating Station Period of Record: July - September 2010 Stability Class - Neutral - 250Ft-30Ft Delta-T (F)

Winds Measured at 30 Feet Wind Spqeed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 6 29 10 1 0 0 46 NNE 6 25 3 0 0 0 34 NE 2 4 0 0 0 0 6 ENE 2 10 2 0 0 0 14 E 5 28 1 0 0 0 34 ESE 1 13 2 0 0 0 16 SE 2 23 7 0 0 0 32 SSE 1 26 10 0 0 0 37 S 3 23 55 5 0 0 86 SSW 4 38 44 18 0 0 104 SW 7 31 31 5 0 0 74 WSW 3 28 16 5 0 0 52 W 6 30 9 8 4 0 57 WNW 9 24 27 8 0 0 68 NW 2 37 20 1 0 0 60 NNW 4 30 9 3 0 0 46 Variable 3 0 0 0 0 0 3 Total 66 399 246 54 4 0 769 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 3 F-32 158 of 208

Byron Generating Station Period of Record: July - September 2010 Stability Class - Slightly 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 22 3 0 0 0 33 NNE 6 10 0 0 0 0 16 NE 5 8 0 16 ENE 8 12 2 0 0 0 22 E 12 16 0 0 0 0 28 ESE 5 12 3 0 0 0 20 SE 9 17 4 0 0 0 30 SSE 12 22 19 0 0 0 53 S 13 45 64 11 0 133 SSW 18 28 27 16 0 93 SW 19 20 6 3 0 48 WSW 16 24 5 1 0 46 W 17 20 13 2 0 52 WNW 14 22 9 0 0 45 NW 20 19 1 0 0 40 NNW 9 36 4 0 0 49 Variable 4 0 0 0 0 4 Total 195 333 163 33 0 728 Hours of calm in this stability class: 1 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 3 F-33 159 of 208

Byron Generating Station Period of Record: July - September 2010 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 5 8 0 0 0 0 13 NNE 4 1 0 0 0 0 5 NE 2 1 0 0 0 0 3 ENE 8 3 0 0 0 0 11 E 10 21 0 0 0 0 31 ESE 4 23 0 0 0 0 27 SE 2 36 0 0 0 0 38 SSE 5 37 12 0 0 0 54 S 9 42 4 0 0 0 55 SSW 17 8 2 0 0 0 27 SW 16 6 0 0 0 0 22 WSW 11 3 0 0 0 0 14 W 24 10 1 0 0 0 35 WNW 17 7 0 0 0 0 24 NW 10 6 0 0 0 0 16 NNW 8 13 0 0 0 0 21 Variable 2 0 0 0 0 0 2 Total 154 225 19 0 0 0 398 Hours of calm in this stability class: 8 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 3 F-34 160 of 208

Byron Generating Station Period of Record: July - September 2010 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 1 2 0 0 0 0 3 NNE 0 1 0 0 0 0 1 NE 0 0 0 0 0 0 0 ENE 1 0 0 0 0 0 1 E 2 2 0 0 0 0 4 ESE 3 8 0 0 0 0 11 SE 7 13 0 0 0 0 20 SSE 8 15 2 0 0 0 25 S 17 15 1 0 0 0 33 SSW 5 1 0 0 0 0 6 SW 4 0 0 0 0 0 4 WSW 5 1 0 0 0 0 6 W 5 0 0 0 0 0 5 WNW 5 0 0 0 0 0 5 NW 8 2 0 0 0 0 10 NNW 5 1 0 0 0 0 6 Variable 0 0 0 0 0 0 0 Total 76 61 3 0 0 0 140 Hours of calm in this stability class: 5 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 3 F-35 161 of 208

Byron Generating Station Period of Record: July - September 2010 Stability Class - Extremely Unstable - 250Ft-30Ft Delta-T (F)

Winds Measured at 250 Feet Wind Spe *ed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 1 1 0 0 0 2 NNE 0 0 1 1 0 0 2 NE 0 0 0 0 0 0 0 ENE 0 0 0 0 0 0 0 E 0 0 0 0 0 0 0 ESE 0 0 0 5 0 0 5 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 3 0 0 0 3 SW 0 0 1 0 0 0 1 WSW 0 0 0 2 0 2 4 W 0 0 1 1 0 6 8 WNW 0 0 0 0 1 1 2 NW 0 0 9 0 1 0 10 NNW 0 0 0 4 0 0 4 Variable 0 0 0 0 0 0 0 Total 0 1 16 13 2 9 41 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 3 F-36 162 of 208

Byron Generating Station Period of Record: July - September 2010 Stability Class - Moderately Unstable - 250Ft-3OFt Delta-T (F)

Winds Measured at 250 Feet Wind Speed (ih 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 2 1 0 0 3 NE 0 0 0 0 0 0 0 ENE 0 1 1 1 0 0 3 E 0 2 1 0 0 0 3 ESE 0 1 0 1 0 0 2 SE 0 0 0 2 0 0 2 SSE 0 0 0 0 0 0 0 S 0 0 0 0 0 0 0 SSW 0 0 2 0 0 0 2 SW 0 0 3 0 1 0 4 WSW 0 0 1 0 0 0 1 W 0 0 1 1 0 1 3 WNW 0 0 0 0 2 1 3 NW 0 1 1 1 2 0 5 NNW 0 0 0 3 0 0 3 Variable 0 1 0 0 0 0 1 Total 0 7 14 10 5 2 38 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 3 F-37 163 of 208

Byron Generating Station Period of Record: July - September 2010 Stability Class - Slightly 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 0 0 N 0 1 0 1 0 0 NNE 0 0 1 1 0 0 0 NE 0 0 0 0 0 ENE 0 1 0 1 0 0 E 0 3 1 4 0 0 ESE 0 0 0 2 0 0 SE 0 0 1 4 0 0 SSE 0 0 0 0 0 0 S 0 0 2 8 0 0 SSW 0 1 4 8 0 0 SW 0 0 6 8 WSW 0 1 3 2 2 9 W 0 2 2 0 0 5 WNW 0 2 0 1 3 11 NW 0 3 2 1 0 10 NNW 0 0 1 2 0 4 Variable 0 1 0 0 0 1 Total 0 15 23 28 6 5 77 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 3 F-38 164 of 208

Byron Generating Station Period of Record: July - September 2010 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 18 20 3 0 1 44 NNE 2 12 14 4 0 0 32 NE 1 7 4 0 0 0 12 ENE 1 2 4 1 0 0 8 E 1 17 11 3 0 0 32 ESE 1 9 9 3 0 0 22 SE 2 8 16 8 1 0 35 SSE 1 13 16 8 1 0 39 S 0 14 18 51 4 0 87 SSW 1 17 31 29 11 3 92 SW 2 20 19 24 15 2 82 WSW 4 15 17 12 4 1 53 W 1 16 23 4 9 7 60 WNW 2 11 16 19 10 3 61 NW 1 11 30 19 1 0 62 NNW 1 12 21 8 4 0 46 Variable 2 0 0 0 0 0 2 Total 25 202 269 196 60 17 769 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 3 F-39 165 of 208

Byron Generating Station Period of Record: July - Septembe *r 2010 Stability Class - Slightly Stable - 250Ft- 30Ft Delta-T (F)

Winds Measured at 250 Feet Wind Spe -ed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 3 4 22 17 0 0 46 NNE 0 4 8 4 0 0 16 NE 0 12 9 3 0 0 24 ENE 0 6 8 2 0 0 16 E 0 15 10 4 0 0 29 ESE 2 3 5 8 1 0 19 SE 1 6 8 10 1 0 26 SSE 0 8 10 7 9 0 34 S 3 4 12 53 41 4 117 SSW 2 16 26 28 31 13 116 SW 1 10 18 16 6 3 54 WSW 4 10 20 16 4 0 54 W 2 10 25 21 3 0 61 WNW 2 7 15 14 3 0 41 NW 2 5 13 17 1 0 38 NNW 1 4 20 13 0 0 38 Variable 0 0 0 0 0 0 0 Total 23 124 229 233 100 20 729 Hours of calm in this stability class: U Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 3 F-40 166 of 208

Byron Generating Station Period of Record: July - September 2010 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 2 5 16 0 0 23 NNE 0 0 2 2 0 0 4 NE 1 4 0 0 8 ENE 0 1 8 0 0 0 9 E 0 6 11 8 2 0 27 ESE 0 1 4 6 6 0 17 SE 1 0 5 8 7 0 21 SSE 0 2 14 18 8 0 42 S 3 5 11 24. 29 0 72 SSW 2 0 6 20 2 0 30 SW 0 1 4 9 3 0 17 WSW 1 5 8 9 0 0 23 W 0 6 7 14 0 0 27 WNW 0 4 10 17 0 0 31 NW 0 4 16 13 0 0 33 NNW 0 4 9 8 0 0 21 Variable 0 0 0 0 0 0 0 Total 8 45 123 172 57 0 405 Hours of calm in this stability class: 1 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 3 F-41 167 of 208

Byron Generating Station Period of Record: July - SeptembE*r 2010 Stability Class - Extremely Stable - 250Ft- -30Ft Delta-T (F)

Winds Measured at 250 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 1 2 0 7 0 0 10 NNE 1 1 3 3 0 0 8 NE 0 0 0 1 0 0 1 ENE 1 0 0 0 0 0 1 E 0 0 2 1 0 0 3 ESE 1 0 0 4 3 0 8 SE 1 1 5 3 2 0 12 SSE 1 2 3 7 5 0 18 S 0 2 1 4 9 1 17 SSW 0 0 2 13 0 0 15 SW 1 2 2 6 0 0 11 WSW 0 1 11 1 0 0 13 W 0 4 7 2 0 0 13 WNW 0 2 3 4 0 0 9 NW 0 2 2 0 0 0 4 NNW 0 0 2 0 0 0 2 Variable 0 0 0 0 0 0 0 Total 7 19 43 56 19 1 145 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 3 F-42 168 of 208

Byron Generating Station Period of Record: October - December 2010 Stability Class - Extremely Unstable - 250Ft-30Ft Delta-T (F)

Winds Measured at 30 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 NNE 0 NE 0 ENE 0 E 0 ESE 0 SE 0 SSE 0 S 0 SSW 0 SW 0 WSW 0 W 0 WNW 0 NW 0 NNW 0 Variable 0 Total 0 3 17 0 24 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 0 F-43 169 of 208

Byron Generating Station Period of Record: October - December 2010 Stability Class - Moderately Unstable - 250Ft-30Ft Delta-T (F)

Winds Measured at 30 Feet Wind Speed (in'mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 1 2 0 0 3 NNE 0 0 1 0 0 0 1 NE 0 0 0 0 0 0 0 ENE 0 0 0 0 0 0 0 E 0 0 0 0 0 0 0 ESE 0 0 0 0 0 0 0 SE 0 0 0 0 0 0 0 SSE 0 0 0 0 0 0 0 S 0 0 0 0 0 0 0 SSW 0 0 0 0 0 0 0 SW 0 3 1 0 0 0 4 WSW 0 2 2 1 0 0 5 W 0 3 1 2 1 0 7 WNW 0 3 1 0 0 0 4 NW 0 1 1 0 0 0 2 NNW 0 1 1 0 0 0 2 Variable 0 0 0 0 0 0 0 Total 0 13 9 5 1 0 28 Hours of calm in this stability class: U Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 0 F-44 170 of 208

Byron Generating Station Period of Record: October - December 2010 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 4 3 2 0 0 9 NNE 0 0 2 0 0 0 2 NE 0 0 0 0 0 0 0 ENE 0 0 0 0 0 0 0 E 0 0 0 0 0 0 0 ESE 0 0 0 0 0 0 0 SE 0 0 0 0 0 0 0 SSE 0 0 0 0 0 0 0 S 0 0 0 0 0 0 0 SSW 0 0 1 2 0 0 3 SW 0 0 0 0 0 0 0 WSW 0 4 2 5 0 0 11 W 0 0 0 3 1 0 4 WNW 0 2 2 4 0 0 8 NW 0 1 1 1 0 0 3 NNW 0 2 3 3 0 0 8 Variable 0 0 0 0 0 0 0 Total 0 13 14 20 1 0 48 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 0 F-45 171 of 208

Byron Generating Station Period of Record: October - December 2010 Stability Class - Neutral - 250Ft-3OFt Delta-T (F)

Winds Measured at 30 Feet Wind Spe ed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 11 47 14 8 0 85 NNE 9 6 0 0 0 15 NE 7 5 0 0 0 12 ENE 4 13 6 0 0 27 E 10 6 0 0 0 18 ESE 12 14 11 6 0 46 SE 7 10 8 1 0 26 SSE 3 23 22 0 0 52 S 9 18 18 0 0 45 SSW 1 21 19 3 0 44 SW 7 17 17 9 1 53 WSW 12 19 43 6 2 85 W 17 38 50 8 4 120 WNW 31 65 43 1 0 144 NW 34 35 3 0 0 75 NNW 20 33 17 7 0 78 Variable 0 0 0 0 0 0 Total 34 194 370 271 49 7 925 Hours of calm in this stability class: 1 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 0 F-46 172 of 208

Byron Generating Station Period of Record: October - December 2010 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 5 23 15 0 0 0 43 NNE 6 6 5 1 0 0 18 NE 2 12 6 0 0 0 20 ENE 2 4 5 8 0 0 19 E 7 24 6 0 0 0 37 ESE 1 8 4 1 1 0 15 SE 1 1 11 11 0 0 24 SSE 3 13 46 39 5 0 106 S 1 16 31 14 1 0 63 SSW 2 18 15 14 0 0 49 SW 5 36 4 10 2 0 57 WSW 4 13 9 3 0 0 29 W 5 37 15 8 0 0 65 WNW 8 27 17 1 0 0 53 NW 7 35 16 1 0 0 59 NNW 4 30 19 0 0 0 53 Variable 0 0 0 0 0 0 0 Total 63 303 224 il1 9 0 710 Hours of calm in this stability class: 1 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 0 F-47 173 of 208

Byron Generating Station Period of Record: October - December 2010 Stability Class - Moderately Stable - 250Ft-30Ft Delta-T (F)

Winds Measured at 30 Feet Wind Spieed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 5 9 3 0 0 17 NNE 2 0 0 0 0 2 NE 3 3 0 0 0 6 ENE 2 0 1 0 0 3 E 9 6 0 0 0 15 ESE 2 4 3 0 0 9 SE 2 4 4 0 0 10 SSE 3 18 12 0 0 33 S 0 19 7 2 0 28 SSW 4 15 2 0 0 21 SW 6 9 0 0 0 15 WSW 3 3 0 0 0 6 W 6 3 0 0 0 9 WNW 18 9 0 0 0 27 NW 15 13 0 0 0 28 NNW 2 18 0 0 0 20 Variable 1 0 0 0 0 1 Total 83 133 32 2 0 0 250 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: 0 F-48 174 of 208

Byron Generating Station Period of Record: October December 2010 Stability Class - Extremely Stable - 250Ft -30Ft Delta-T (F)

Winds Measured at 30 Feet Wind Sp~eed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total 1 0 0 N 0 0 0 1 1 0 0 NNE 0 0 0 1 1 0 0 NE 0 0 0 1 0 0 2 ENE 0 2 0 0 0 0 8 E 5 3 0 0 ESE 7 1 2 0 0 0 10 SE 3 2 11 0 0 0 16 SSE 5 11 7 0 0 0 23 S 15 16 3 0 0 0 34 SSW 9 7 0 0 0 0 16 SW 13 2 0 0 0 0 15 WSW 13 0 0 0 0 0 13 W 17 2 0 0 0 0 19 WNW 14 1 0 0 0 0 15 NW 21 4 0 0 0 0 25 NNW 9 2 0 0 0 0 11 Variable 0 0 0 0 0 0 0 Total 134 53 23 0 0 0 210 Hours of calm in this stability class: 8 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 0 F-49 175 of 208

Byron Generating Station Period of Record: October December 2010 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

NNE NE ENE E

ESE SE SSE S

SSW SW WSW W

WNW NW NNW Variable Total 0 0 8 12 4 0 24 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 0 F-50 176 of 208

Byron Generating Station Period of Record: October - December 2010 Stability Class - Moderately Unstable - 250Ft-30Ft Delta-T (F)

Winds Measured at 250 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 0 1 2 0 3 NNE 0 0 1 0 0 0 1 NE 0 0 0 0 0 0 0 ENE 0 0 0 0 0 0 0 E 0 0 0 0 0 0 0 ESE 0 0 0 0 0 0 0 SE 0 0 0 0 0 0 0 SSE 0 0 0 0 0 0 0 S 0 0 0 0 0 0 0 SSW 0 0 0 0 0 0 0 SW 0 0 4 1 0 0 5 WSW 0 1 1 1 1 0 4 W 0 2 1 2 1 1 7 WNW 0 1 3 1 0 0 5 NW 0 0 1 0 0 0 1 NNW 0 1 0 1 0 0 2 Variable 0 0 0 0 0 0 0 Total 0 5 11 7 4 1 28 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 0 F-51 177 of 208

Byron Generating Station Period of Record: October December 2010 Stability Class - Slightly Unstable - 25OFt -30Ft Delta-T (F)

Winds Measured at 250 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 2 0 9 NNE 0 0 3 NE 0 0 0 ENE 0 0 0 E 0 0 0 ESE 0 0 0 SE 0 0 0 SSE 0 0 0 S 0 0 0 SSW 2 0 2 SW 0 0 1 WSW 4 0 10 W 2 0 5 WNW 1 0 7 NW 0 0 4 NNW 2 0 7 Variable 0 0 0 Total 0 10 12 13 13 0 48 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 0 F-52 178 of 208

Byron Generating Station Period of Record: October - December 2010 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 12 62 4 12 98 NNE 3 8 9 3 2 0 25 NE 0 2 5 3 0 0 10 ENE 1 1 7 6 1 1 17 E 1 3 9 9 4 0 26 ESE 2 10 7 9 8 8 44 SE 1 4 9 5 8 4 31 SSE 3 4 2 21 17 7 54 S 0 3 13 8 17 1 42 SSW 1 1 8 19 9 5 43 SW 1 3 17 6 9 14 50 WSW 0 4 14 19 39 7 83 W 1 3 32 27 44 13 120 WNW 1 13 25 48 38 2 127 NW 2 20 25 35 6 0 88 NNW 0 13 14 18 13 10 68 Variable 0 0 0 0 0 0 0 Total 18 99 208 298 219 84 926 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 0 F-53 179 of 208

Byron Generating Station Period of Record: October - Decemt er 2010 Stability Class - Slightly Stable - 250Ft- 30Ft Delta-T (F)

Winds Measured at 250 Feet Wind SpEeed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 4 13 28 5 0 50 NNE 0 1 12 15 2 0 30 NE 1 2 6 9 2 0 20 ENE 1 5 6 6 7 0 25 E 0 7 13 10 2 0 32 ESE 0 1 3 5 5 1 15 SE 0 0. 4 3 5 9 21 SSE 0 0 4 9 44 28 85 S 1 4 3 21 26 11 66 SSW 0 1 6 28 15 7 57 SW 1 1 28 15 3 13 61 WSW 0 3 9 18 1 0 31 W 0 3 19 19 10 2 53 WNW 1 4 20 16 3 0 44 NW 1 4 21 39 4 0 69 NNW 1 8 9 30 4 0 52 Variable 0 0 0 0 0 0 0 Total 7 48 176 271 138 71 711 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 0 F-54 180 of 208

Byron Generating Station Period of Record: October - December 2010 Stability Class - Moderately Stable - 250Ft-3OFt Delta-T (F)

Winds Measured at 250 Feet Wind Spe*ed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 3 9 10 2 0 24 NNE 0 2 5 9 3 0 19 NE 0 4 1 2 0 0 7 ENE 3 4 0 0 0 8 E 1 3 3 3 2 0 12 ESE 1 1 4 3 0 9 1

SE 1 2 1 1 0 5 0

SSE 1 2 1 8 2 2 16 S 0 1 3 9 15 1 29 SSW 1 0 5 12 8 0 26 0

SW 1 3 12 1 0 17 0

WSW 1 0 1 13 0 0 15 W 10 1 3 7 0 0 11 WNW o 1 5 3 0 0 9 NW 0 4 16 0 0 20 NNW 0 8 15 2 0 26 Variable o 0 0 0 0 0 Total 6 23 58 124 39 3 253 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 0 F-55 181 of 208

Byron Generating Station Period of Record: October - December 2010 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 1 2 5 7 0 0 15 NNE 1 6 2 1 0 0 10 NE 0 8 0 0 0 0 8 ENE 0 4 0 0 0 0 4 E 0 2 0 1 0 0 3 ESE 1 2 3 1 0 0 7 SE 0 2 7 3 1 0 13 SSE 1 3 2 3 19 S 0 1 6 3 16 SSW 1 1 11 0 20 SW 0 1 6 0 11 WSW 0 4 5 0 12 W 3 4 15 0 26 WNW 1 6 12 0 24 NW 1 1 9 0 15 NNW 2 2 8 0 15 Variable 0 0 0 0 0 Total 12 53 40 87 20 6 218 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 0 F-56 182 of 208

APPENDIX G ANNUAL RADIOLOGICAL GROUNDWATER PROTECTION PROGRAM REPORT (ARGPPR) 183 of 208

184 of 208 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 2010 Prepared By Teledyne Brown Engineering Environmental Services SM Nuclear Byron Nuclear Generating Station Byron, IL 61010 May 2011 185 of 208

186 of 208 Table Of Contents I. Sum m ary and Conclusions .............................................................................................. 1 II. Introduction ............................................................................................................. 3 A. O bjectives of the RG PP .................................................................................. 3 B. Im plem entation of the O bjectives .................................................................. 3 C. Program Description ...................................................................................... 4 D. Characteristics of Tritium (H-3) ...................................................................... 5 I1l. Program Description ................................................................................................ 5 A. Sam ple Analysis .............................................................................................. 5 B. Data Interpretation .......................................................................................... 6 C. Background Analysis ....................................................................................... 7

1. Background Concentrations of Tritium ................................................. 7 IV. Results and discussion .............................................................................................. 9 A. Groundwater Results ..................................................................................... 9 B. Drinking W ater W ell Survey ......................................................................... 10 C. Summary of Results - Inter-laboratory Comparison Program ...................... 10 D. Leaks, Spills, and Releases ......................................................................... 11 E. Trends ......................................................................................................... 11 F. Investigations ................................................................................................. 11 G . Actions Taken .............................................................................................. 11 187 of 208

Appendices Appendix A Location Designation Tables Table A-1 Radiological Groundwater Protection Program - Sampling Locations, Distance and Direction, Byron Nuclear Generating Station, 2010 Figures Figure A-I Monitoring Well Locations, Byron Nuclear Generating Station, 2010 (Extra wells noted on map are for reference only.)

Appendix B Data Tables Tables Table B-1.1 Concentrations of Tritium, Gross Alpha, and Gross Beta in Groundwater Samples Collected in the Vicinity of Byron Nuclear Generating Station, 2010.

Table B-1.2 Concentrations of Hard-To-Detects in Groundwater Samples Collected in the Vicinity of Byron Nuclear Generating Station, 2010.

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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 I was conducted by Conestoga Rovers and Associates (CRA) and the conclusions were made available to state and federal regulators as well as the public.

Phase 2 of the RGPP was conducted by Exelon corporate and station personnel to initiate follow up of Phase 1 and begin long-term monitoring at groundwater locations selected during Phase 1. This is the fifth 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 2010. During that time period, 67 analyses were performed on 25 samples from 13 locations.

In accordance with Byron's Radiological Groundwater Protection Program, gamma-emitting radionuclides associated with licensed plant operations were not sampled in 2010. In the case of tritium, Exelon specified that its laboratories achieve a lower limit of detection 10 times lower than that required by federal regulation.

In 2010, thirteen (13) Radiological Groundwater Protection Program (RGPP) monitoring wells were sampled. The samples were obtained in May and October and analyzed for tritium. In addition, a baseline study of hard-to-detect radioisotopes was performed in accordance with Nuclear Energy Institute (NEI) 07-07, Groundwater Protection Initiative, for the samples obtained in May. Of these samples, two wells contained levels of tritium above the lower limit of detection (LLD) of 200 pCi/L. They were: AR-4 (1250 pCi/L in May, 1170 pCi/L in October) and AR-11 (1120 pCi/L in May, 947 pCi/L in October). Both of these wells are near the Circulating Water Blowdown piping, where historical leakage through vacuum breakers was known to have occurred. Well AR-4 has shown an overall steady decrease in tritium concentration since first sampled in 2006.

Well AR-1 1 has also shown an overall decrease in tritium since 2006. The dose consequence from tritium present in these sample wells is negligible.

Gross Alpha and Gross Beta analyses in the dissolved and suspended fractions were performed on groundwater samples during the first sampling in 2010.

Gross Alpha (dissolved) was not detected in any of 3 groundwater locations.

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Gross Alpha (suspended) was detected in 1 of 3 groundwater locations at a concentration of 1.4 pCi/L. Gross Beta (dissolved) was detected in 2 of 3 groundwater locations. The concentrations ranged from 6.8 to 35.1 pCi/L.

Gross Beta (suspended) was detected in 2 of 3 groundwater locations. The concentrations ranged from 2.1 to 3.3 pCi/L. The concentrations of Gross Alpha and Gross Beta, which are slightly above detectable levels, are considered to be background and are not the result of plant effluents.

Hard-To-Detect analyses were performed on a select group of groundwater locations to establish background levels. The analyses included Fe-55, Ni-63, Am-241, Cm-242, Cm-243/244, Pu-238, Pu-239/240, U-233/234, U-235 and U-238. The isotope of U-233/234 was detected in one of three groundwater monitoring locations at a concentration of 0.3 pCi/L. This concentration of U-233/234, which is slightly above detectable level, is considered to be background and is not the result of plant effluents.

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 2010.

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.

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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 strike air molecules. Tritium is also produced during nuclear weapons explosions, as a by-product in reactors producing electricity, and in special production reactors, where the isotopes lithium-7 and/or boron-10 are activated to produce tritium. Like normal water, tritiated water is colorless and odorless. Tritiated water behaves chemically and physically like non-tritiated water in the subsurface, and therefore tritiated water will travel at the same velocity as the average groundwater velocity.

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

Ill. Program Description A. Sample Analysis This section describes the general analytical methodologies used by TBE to analyze the environmental samples for radioactivity for the Byron Nuclear Generating Station RGPP in 2010.

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

1. Concentrations of gamma emitters in groundwater.

2. Concentrations of strontium in groundwater.

3. Concentrations of tritium in groundwater.

4. Concentrations of Am-241 in groundwater.

5. Concentrations of Cm-242 and Cm-243/244 in groundwater.

6. Concentrations of Pu-238 and PU-239/240 in groundwater.

7. Concentrations of U-233/234, U-235 and U-238 in groundwater.

8. Concentrations of Fe-55 in groundwater.

9. Concentrations of Ni-63 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 194 of 208

reports the uncertainty of a measurement created by statistical process (counting error) as well as all sources of error (Total Propagated Uncertainty or TPU). Each result has two values calculated. Exelon reports the TPU by following the result with plus or minus +/- the estimated sample standard deviation, as TPU, that is obtained by propagating all sources of analytical uncertainty in measurements.

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

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

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

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 195 of 208

abundant uranium and thorium. Lithogenic production of tritium is usually negligible compared to other sources due to the limited abundance of lithium in rock. The lithogenic tritium is introduced directly to groundwater.

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

b. Precipitation Data Precipitation samples are routinely collected at stations around the world for the analysis of tritium and other radionuclides. Two publicly available databases that provide tritium concentrations in precipitation are Global Network of Isotopes in Precipitation (GNIP) and 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 196 of 208

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

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

According to USEPA, this corresponds to a +/- 70 to 100 pCi/L 95% confidence bound on each given measurement.

Therefore, the typical background data provided may be subject to measurement uncertainty of approximately +/- 70 to 100 pCi/L.

The radio-analytical laboratory is counting tritium results to an Exelon specified LLD of 200 pCi/L. Typically, the lowest positive measurement will be reported within a range of 40 -

240 pCi/L or 140 +/- 100 pCi/L. Clearly, these sample results cannot be distinguished as different from background at this concentration.

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

Analytical results and anomalies are discussed below.

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 1,250 pCi/L. Within the station boundary, concentrations of tritium at the bottom of the Galena-Platteville aquifer ranged from 947 to 1,250 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 thirteen wells sampled in 2010, two contained levels of tritium above the lower limit of detection (LLD) of 200 pCi/L. They were: AR-4 (1,250 and 1,170 pCi/L), and AR-11 (1,120 and 947 pCi/L). Both wells have shown an overall decrease in tritium concentration since first sampled in 2006.

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.

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Groundwater quality data from production wells and monitoring wells at the station located below this aquifer do not indicate concentrations of tritium greater than the LLD of 200 pCi/L. As such, the tritium impact is limited to the Galena-Platteville aquifer.

Strontium Strontium-90 was not analyzed in 2010.

Gross Alpha and Gross Beta (dissolved and suspended)

Gross Alpha and Gross Beta analyses in the dissolved and suspended fractions were performed on groundwater surface water samples during the second sampling in 2010. Gross Alpha (dissolved) was not detected in any of 3 groundwater locations. Gross Alpha (suspended) was detected in 1 of 3 groundwater locations at a concentration of 1.4 pCi/L.

Gross Beta (dissolved) was detected in 2 of 3 groundwater locations. The concentrations ranged from 6.8 to 35.1 pCi/L. Gross Beta (suspended) was detected in 2 of 3 groundwater locations. The concentrations ranged from 2.1 to 3.3 pCi/L. The concentrations detected are considered to be background and not the result of plant effluents.

Gamma Emitters Gamma-emitting radionuclides associated with licensed plant operations were not analyzed in 2010.

Hard-To-Detect Hard-To-Detect analyses were performed on a select group of groundwater locations to establish background levels. The analyses included Fe-55, Ni-63, Am-241, Cm-242, Cm-243/244, Pu-238, Pu-239/240, U-233/234, U-235, and U-238. The isotope of U-233/234 was detected in one groundwater water monitoring location at a concentration of 0.3 pCi/L. The concentration detected is considered to be background and not the result of plant effluents (Table B-1.2, Appendix B).

B. Drinking Water Well Survey No drinking water well surveys were conducted in 2010.

C. Summary of Results - Inter-Laboratory Comparison Program Inter-Laboratory Comparison Program results for TBE are presented in 198 of 208

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 2010.

E. Trends Wells AR-4 and AR-1 1 have shown an overall decrease in tritium concentration since first sampled in 2006.

F. Investigations No investigations were initiated in 2010 due to anomalous sample results.

G. Actions Taken

1. Compensatory Actions No compensatory actions were initiated in 2010.

2. Installation of Monitoring Wells No new monitoring wells were installed in 2010.

3. Actions to Recover/Reverse Plumes No actions were undertaken to recover/reverse plumes in 2010.

-11 -

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APPENDIX A LOCATION DESIGNATION 201 of 208

202 of 208 TABLE A-1: Radiological Groundwater Protection Program - Sampling Locations, Distance and Direction, Byron Nuclear Generating Station, 2010 Site Site Type Temporary/Permanent Distance and Direction AR-1 Monitoring Well Permanent 0.36 miles/NNW AR-10 Monitoring Well Permanent 0.28 miles/NE AR-11 Monitoring Well Permanent 1.36 miles/WNW AR-2 Monitoring Well Permanent 0.6 miles/NW AR-3 Monitoring Well Permanent 0.8 miles/NW AR-4 Monitoring Well Permanent 1.36 miles/WNW AR-5 Monitoring Well Permanent 1.92 miles/WNW AR-6 Monitoring Well Permanent 2.04 miles/WNW AR-7 Monitoring Well Permanent 0.04 miles/W AR-8 Monitoring Well Permanent 0.12 miles/S AR-9 Monitoring Well Permanent 0.24 miles/E CAR-1 Monitoring Well Permanent 2.25 miles/WNW CAR-2 Monitoring Well Permanent 1.52 miles/WNW CAR-3 Monitoring Well Permanent 0.16 miles/SE DF-24 (EPA well) Monitoring Well Permanent 1.36 miles/WNW GW-9 Monitoring Well Permanent 0.9 miles/WNW MW-1 (EPA well) Monitoring Well Permanent 0.6 miles/NW MW-3 (EPA well) Monitoring Well Permanent 0.8 miles/NW TW-13 Monitoring Well Permanent 2.3 miles/WNW TW-14 Monitoring Well Permanent 2.25 miles/WNW TW-15 Monitoring Well Permanent 2.2 miles/WNW Well 7 Monitoring Well Permanent 0.4 miles/SE A-1 203 of 208

C> ...

C Figure A-1 0Monitoring Well Locations, Byron Nuclear Generating Station, 2010

APPENDIX B DATA TABLES 205 of 208

TABLE B-1.1 CONCENTRATIONS OF TRITIUM, GROSS ALPHA, AND GROSS BETA IN GROUND WATER SAMPLE COLLECTED AS PART OF THE RADIOLOGICAL GROUNDWATER PROTECTION PROGRAM, BYRON NUCLEAR GENERATING STATION, 2010 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION SITE DATE H-3 GR-A (DIS) GR-A (SUS) GR-B (DIS) GR-B (SUS)

AR-1 05/17/10 < 154 AR-i 10/22/10 < 159 AR-10 05/17/10 < 157 < 4.4 <2.9 35.1 +/- 8.6 < 4.0 AR-10 10/22/10 < 160 AR-1i 05/20110 1120 +/- 162 AR-11 10/21/10 947 +/- 149 AR-2 05/19/10 160 AR-2 10/20/10 163 AR-3 05/19/10 156 AR-3 10/20/10 162 AR-4 05119/10 1250 +/- 173 < 1.6 < 1.3 < 3.1 2.1 +/- 1.2 AR-4 10/21110 1170 +/- 168 AR-7 05/17110 179 +/- 103 < 2.9 1.4 +/- 0.9 6.8 +/- 3.5 3.3 +/- 1.3 AR-7 10/21/10 171 AR-8 05/17/10 150 AR-8 10/21/10 163 AR-9 05/17/10 150 AR-9 10/22/10 161 CAR-i 10/20/10 (1)

CAR-i 10/20/10 157 CAR-3 05/17/10 158 CAR-3 10/21/10 160 DF-24 05/19/10 157 DF-24 10/21/10 157 TW-13 05/19/10 153 TW-13 10/21110 161 (1) WELL NOT SAMPLED IN MAY DUE TO WELL BEING DRY AT TIME OF COLLECTION B-1 206 of 208

TABLE B-I.2 CONCENTRATIONS OF HARD TO DETECTS IN GROUND WATER SAMPLES COLLECTED AS PART OF THE RADIOLOGICAL GROUNDWATER PROTECTION PROGRAM, BYRON NUCLEAR GENERATING STATION, 2010 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA SITE COLLECTION AM-241 CM-242 CM-243/244 PU-238 PU-239/240 U-233/234 U-235 U-238 FE-55 NI-63 PERIOD PERIOD BY-AR-10 5/17/2010 < 0.10 < 0.10 < 0.04 < 0.2 < 0.1 < 0.03 < 0.06 < 0.07 < 181 <4.5 BY-AR-4 5/19/2010 < 0.07 < 0.04 < 0.04 < 0.2 < 0.1 0.28 + 0.13 < 0.04 < 0.10 < 168 < 4.4 BY-AR-7 5/17/2010 < 0.02 < 0.02 < 0.06 < 0.1 < 0.1 < 0.08 < 0.05 < 0.04 < 147 < 4.4 0

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BYRON 2011-0071, Annual Radiological Environmental Operating Report (AREOR)

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