Text

Annual Radiological Environmental Operating Report (AREOR)
	ML12136A477
Person / Time
Site:	Byron
Issue date:	05/11/2012
From:	Tulon T; Exelon Generation Co, Exelon Nuclear
To:	; Document Control Desk, Office of Nuclear Reactor Regulation
References
	2012-0044
	Download: ML12136A477 (201)
	v • d • e

Exelon Generation Company, LLC www.exeloncorp.com Exelkn@

Nuclear Byron Station 445o North German Church Road Byron, IL61oi0-9794 May 11,2012 LTR: BYRON 2012-0044 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:

2011 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 Re Port (AREOR) for Byron Station. This report is required to be submitted to the NRC by May i5t 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.

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

Respectfully,

ýTi J.Tulon S'inVice President Byron Nuclear Generating Station TJT/JG/TLH/cy Attachments: AREOR

Docket No: 50-454 50-455 BYRON NUCLEAR GENERATING STATION UNITS I and 2 Annual Radiological Environmental Operating Report 1 January Through 31 December 2011 Prepared By Teledyne Brown Engineering Environmental Services Nuclear Byron Nuclear Generating Station Byron, IL 61010 May 2012 1 of 200

2 of 200 Table Of Contents I. Sum mary and Conclusions .............................................................................................. 1 II. Introduction ............................................................................................................. 3 A. Objectives of the REMP .................................................................................. 3 B. Im plementation of the Objectives .................................................................... 3 I1l. Program Description ................................................................................................ 3 A. Sam ple Collection ........................................................................................... 3 B. Sample Analysis .............................................................................................. 6 C. Data Interpretation ......................................................................................... 6 D. Program Exceptions ....................................................................................... 7 E. Program Changes ......................................................................................... 9 IV. Results and Discussion ........................................................................................... 9 A. Aquatic Environment ....................................................................................... 9

1. Surface W ater ..................................................................................... 9

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

3. Fish ..................................................................................................... 10

4. Sediment ............................................................................................ 10 B. Atmospheric Environment ............................................................... ......... 11

1. Airborne .............................................................................................. 11

a. Air Particulates ......................................................................... 11

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

2. Terrestrial ............................................................................................ 12

a. Milk .......................................................................................... 12

b. Vegetation ................................................................................ 12 C. Am bient Gam ma Radiation .......................................................................... 13 D. Land Use Survey .......................................................................................... 13 E. Errata Data ................................................................................................... 13 F. Summary of Results - Inter-laboratory Comparison Program ...................... 14 3 of 200

Appendices Appendix A Radiological Environmental Monitoring Report Summary Tables Table A-1 Radiological Environmental Monitoring Program Summary for Byron Nuclear Generating Station, 2011 Appendix B Location Designation, Distance & Direction, and Sample Collection &

Analytical Methods Tables Radiological Environmental Monitoring Program - Sampling Locations, Table B-1 Distance and Direction, Byron Nuclear Generating Station, 2011 Table B-2 Radiological Environmental Monitoring Program - Summary of Sample Collection and Analytical Methods, Byron Nuclear Generating Station, 2011 Figqures Figure B-1 Inner and Outer Ring TLD Locations of the Byron Nuclear Generating Station, 2011 Figure B-2 Onsite Air Sampling Locations of the Byron Nuclear Generating Station, 2011 Figure B-3 Offsite Air Sampling Locations of the Byron Nuclear Generating Station, 2011 Figure B4 Ingestion and Waterborne Exposure Pathway Sampling Locations of the Byron Nuclear Generating Station, 2011 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, 2011.

Table C-1.2 Concentrations of Tritium in Surface Water Samples Collected in the Vicinity of Byron Nuclear Generating Station, 2011.

Table C-1.3 Concentrations of Gamma Emitters in Surface Water Samples Collected in the Vicinity of Byron Nuclear Generating Station, 2011

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Table C-II. 1 Concentrations of Tritium in Ground Water Samples Collected in the Vicinity of Byron Nuclear Generating Station, 2011.

Table C-II.2 Concentrations of Gamma Emitters in Ground Water Samples Collected in the Vicinity of Byron Nuclear Generating Station, 2011.

Table C-111.1 Concentrations of Gamma Emitters in Fish Samples Collected in the Vicinity of Byron Nuclear Generating Station, 2011.

Table C-IV.1 Concentrations of Gamma Emitters in Sediment Samples Collected in the Vicinity of Byron Nuclear Generating Station, 2011.

Table C-V.1 Concentrations of Gross Beta in Air Particulate Samples Collected in the Vicinity of Byron Nuclear Generating Station, 2011.

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, 2011.

Table C-V.3 Concentrations of Gamma Emitters in Air Particulate Samples Collected in the Vicinity of Byron Nuclear Generating Station, 2011.

Table C-VI.1 Concentrations of 1-131 in Air Iodine Samples Collected in the Vicinity of Byron Nuclear Generating Station, 2011.

Table C-VII.1 Concentrations of 1-131 in Milk Samples Collected in the Vicinity of Byron Nuclear Generating Station, 2011.

Table C-VII.2 Concentrations of Gamma Emitters in Milk Samples Collected in the Vicinity of Byron Nuclear Generating Station, 2011.

Table C-VIII.1 Concentrations of Gamma Emitters in Vegetation Samples Collected in the Vicinity of Byron Nuclear Generating Station, 2011.

Table C-IX.1 Quarterly TLD Results for Byron Nuclear Generating Station, 2011.

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, 2011.

Table C-IX.3 Summary of the Ambient Dosimetry Program for Byron Nuclear Generating Station, 2011.

Figures Figure C-1 Surface Water - Gross Beta - Stations BY-12 and BY-29 (C) Collected in the Vicinity of BNGS, 2000 - 2011.

Figure C-2 Surface Water - Tritium - Stations BY-12 and BY-29 (C) Collected in the Vicinity of BNGS, 2000 - 2011.

Figure C-3 Ground Water - Tritium - Stations BY-14-1 and BY-18 Collected in the Vicinity of BNGS, 2000 - 2011.

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Figure C-4 Ground Water - Tritium - Stations BY-1 8-1 Collected in the Vicinity of BNGS, 2010 - 2011.

Figure C-5 Ground Water - Tritium - Station BY-32 Collected in the Vicinity of BNGS, 2000 - 2011.

Figure C-6 Ground Water - Tritium - Station BY-35 and BY-36 Collected in the Vicinity of BNGS, 2006 - 2011.

Figure C-7 Ground Water - Tritium - Station BY-37 Collected in the Vicinity of BNGS, 2006 - 2011.

Figure C-8 Air Particulate - Gross Beta - Stations BY-08 (C) and BY-21 Collected in the Vicinity of BNGS, 2000 - 2011.

Figure C-9 Air Particulate - Gross Beta - Stations BY-22 and BY-23 Collected in the Vicinity of BNGS, 2000 - 2011.

Figure C-10 Air Particulate - Gross Beta - Station BY-24 Collected in the Vicinity of BNGS, 2000 - 2011.

Figure C-i 1 Air Particulate - Gross Beta - Station BY-01 and BY-04 Collected in the Vicinity of BNGS, 2005 - 2011.

Figure C-12 Air Particulate - Gross Beta - Station BY-06 Collected in the Vicinity of BNGS, 2005 - 2011.

Appendix D Inter-Laboratory Comparison Program Tables Table D-1 Analytics Environmental Radioactivity Cross Check Program Teledyne Brown Engineering, 2011 Table D-2 ERA Environmental Radioactivity Cross Check Program Teledyne Brown Engineering, 2011 Table D-3 DOE's Mixed Analyte Performance Evaluation Program (MAPEP)

Teledyne Brown Engineering, 2011 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 200

Intentionally left blank

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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 2011 through 31 December 2011. During that time period, 1,472 analyses were performed on 1,351 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.

On March 11, 2011 an earthquake off the Japanese islands produced a massive tsunami that caused a nuclear accident at four of the six Fukushima Daiichi reactors. In planning for the potential radioactive plume reaching the United States, Exelon Nuclear increased the sampling frequency and added additional analyses of select media from pathways that were expected to be the most sensitive to any increase in ambient radiation levels. Low level 1-131 analyses and gamma spectroscopy analyses were performed on air particulates, air iodine, and milk, as appropriate.

The resulting radioactive plume was first detected in the environs of Byron Nuclear Generating Station on March 22, 2011. The final date of positive detection was April 12, 2011. The radionuclide identified was Iodine-131.

Maximum activity levels found by media were 116 E-3 pCi/m 3 for air iodine.

Samples collected were compared to offsite control locations to verify that these positive detections were not attributable to licensed activities. All other radionuclides analyzed were below the MDC (Minimum Detectable Concentration).

The radioactive half-life of 1-131 is about 8 days. This short half-life allowed the affects of this radioactive plume to subside over about 4 weeks. As of April 13, 2011 no further impacts from the Fukushima Daiichi accident were evident.

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 detected at one sediment location. Low levels of Cs-1 37 are detected occasionally and are consistent with data from previous years and are not a result of plant effluents.

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

High sensitivity 1-131 analyses were performed on weekly air samples. All results were less than the minimum detectable concentration with the exception 9 of 200

of 26 samples which were positive for 1-131. These positive results are directly attributed to the Fukushima event in March of 2011.

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 1,280 and 1,254 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 Mirion Technologies on samples collected during the period 1 January 2011 through 31 December 2011.

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.

Ill. Program Description A. Sample Collection Samples for the BNGS REMP were collected for Exelon Nuclear by Environmental Inc. (Midwest Labs). This section describes the general collection methods used by Environmental Inc. to obtain environmental 11 of 200

samples for the BNGS REMP in 2011. Sample locations and descriptions can be found in Table B-1 and Figures B-1 through B-4, Appendix B.

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

Two gallon water samples were collected weekly from two surface water locations (BY-12 and BY-29 [Control location]) and quarterly from six ground water locations (BY-14-1, BY-18-1, BY-32, BY-35, BY-36 and BY-37). All samples were collected in new unused plastic bottles, which were rinsed with source water prior to collection. Fish samples comprising the flesh of golden redhorse, quillback, river carpsucker, smallmouth bass and common carp were collected semiannually at two locations, BY-29 (control) and BY-31. Sediment samples composed of recently deposited substrate were collected at two locations semiannually, BY-12 and BY-29 (in place of BY-34 temporarily)(control).

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

Terrestrial Environment The terrestrial environment was evaluated by performing radiological analyses on samples of milk and food product. 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 August at five locations (BY-Control, BY-Quad 1, BY-Quad 2, BY-Quad 3, and BY-Quad 4).

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

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Ambient Gamma Radiation 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 ringq 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 ringq 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 200

sent to Mirion Technologies 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 2011. 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 200

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

2. Net Activity Calculation and Reporting of Results Net activity for a sample was calculated by subtracting background activity from the sample activity. Since the REMP measures extremely small changes in radioactivity in the environment, background variations may result in sample activity being lower than the background activity effecting a negative number. An MDC was reported in all cases where positive activity was not detected.

Gamma spectroscopy results for each type of sample were grouped as follows:

For surface water, ground water and vegetation twelve nuclides, Mn-54, Co-58, Fe-59, Co-60, Zn-65, Nb-95, Zr-95, 1-131, Cs-134, Cs-137, Ba-140, and La-140 were reported.

For fish, sediment, air particulate and milk eleven nuclides, Mn-54, Co-58, Fe-59, Co-60, Zn-65, Nb-95, Zr-95, Cs-134, Cs-1 37, Ba-1 40 and La-1 40 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 2011 the BNGS REMP had a sample recovery rate in excess of 99%.

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

Table D-1 LISTING OF SAMPLE ANOMALIES Sample Location Collection Reason Type Code Date A/I BY-24 02/08/11 Low timer reading due to power outage from snowstorm.

A/I BY-08 03/29/11 Timer would not reset - replaced.

TLD ALL 03/29/11 All TLDs were not available for scheduled exchange - replaced on 04/05/11.

Al ALL 04/12/11 1-131 positive detects were due to the Fukushima accident.

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

Sample Location Collection Sample Location Collection Reason Type Code Date A/I BY-04 05/24/11 Low timer reading due to power outage from storm.

A/I BY-22 05/24/11 Low timer reading due to power outage from storm.

A/I BY-23 05/24/11 Low timer reading due to power outage from storm.

A/I BY-24 05/24/11 Low timer reading due to power outage from storm.

Location inaccessible due to construction; S BY-34 05/24/11 upstream sample taken from location BY-29.

A/I BY-08 06/07/11 Vacuum gauge broken; replaced and checked.

A/I BY-21 06/14/11 Low timer reading due to power line repair.

TLD ALL 06/28/11 TLDs not available for scheduled exchange -

replaced on 07/19/11.

A/I ALL 07/12/11 Pump field checks delayed until 07/19/11 -

rotameter damaged in transit.

Location inaccessible due to construction; S BY-34 10/18/11 upstream sample taken from location BY-29.

A/I BY-01 10/25/11 Timer would not reset - replaced.

Table D-2 I-STING OF MISSED SAMPLES n Collection Sample Locatio Reason Type Code Date SW BY-1 2, BY-29 01/04/11 Sample unobtainable due to ice on river.

SW BY-12, BY-29 01/11/11 Sample unobtainable due to ice on river.

SW BY-12, BY-29 01/18/11 Sample unobtainable due to ice on river.

SW BY-12, BY-29 01/25/11 Sample unobtainable due to ice on river.

SW BY-12, BY-29 02/01/11 Sample unobtainable due to ice on river.

SW BY-12, BY-29 02/08/11 Sample unobtainable due to ice on river.

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Each program exception was reviewed to understand the causes of the program exception. Sampling and maintenance errors were reviewed with the personnel involved to prevent recurrence. Occasional equipment breakdowns and power outages were unavoidable.

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

E. Program Changes There were no program changes in 2011.

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 2.9 to 7.6 pCi/l. Concentrations detected were consistent with those detected in previous years (Figure C-1, Appendix C).

Tritium Quarterly composites of weekly collections were analyzed for tritium activity (Table C-1.2, Appendix C). Tritium was detected in three samples. The concentration ranged from 225 to 584 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, 17 of 200

and all required LLDs were met.

2. Ground Water Quarterly grab samples were collected at six locations (BY-14-1, BY-1 8-1, 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:

Tritium Quarterly grab samples from the locations were analyzed for tritium activity (Table C-11.1, Appendix C). No tritium was detected, and the required LLD was met (Figures C-3 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 golden redhorse, quillback, river carpsucker, smallmouth bass 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-29) 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 18 of 200

detected in one sample at a concentration of 166 pCi/L.

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

B. Atmospheric Environment

1. Airborne

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

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

Detectable gross beta activity was observed at all locations.

Comparison of results among the three groups aid in determining the effects, if any, resulting from the operation of BNGS. The results from the Nearsite locations (Group I) ranged from 7 to 43 E-3 pCi/m 3 with a mean of 20 E-3 pCi/m 3. The results from the Far Field locations (Group II) ranged from 7 to 45 E-3 pCi/m 3 with a mean of 20 E-3 pCi/m 3. The results from the Control location (Group Ill) ranged from 8 to 36 E-3 pCi/m 3 with a mean of 20 E-3 pCi/m 3 . Comparison of the 2011 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 2011 indicate no notable differences among the three groups (Figures C-8 through C-12, 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.

Additional sampling occurred in the weeks immediately following the Fukushima event in 2011. All nuclides were less than the MDC.

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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). All results were less than the minimum detectable concentration with the exception of 26 samples which were positive for 1-131. These positive results are directly attributed to the Fukushima event in March of 2011.

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

Gamma Spectrometry Each milk sample was analyzed for concentrations of gamma emitting nuclides (Table C-VII.2, Appendix C). No nuclides were detected, and all required LLDs were met.

b. Vegetation Vegetation samples were collected at five locations (BY-Control, BY-Quad 1, BY-Quad 2, BY-Quad 3 and BY-Quad 4) when available. Four locations (BY-Quad 1, BY-Quad 2, BY-Quad 3 and BY-Quad 4) could be affected by Byron Nuclear Generating Station's effluent releases.

The following analysis was performed:

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.

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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 34 mR/standard quarter. A comparison of the Inner Ring, Outer Ring, Special Interest, Other and Control Location data indicate that the ambient gamma radiation levels were comparable among the groups.

D. Land Use Survey A Land Use Survey conducted during August 2011 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 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 4.2 12.0 B NNE 1.6 1.5 C NE 1.1 D ENE 1.0 3.5 -

E E 1.2 4.2 F ESE 1.5 1.5 G SE 1.7 4.3 H SSE 0.7 3.5 J S 0.6 0.7 K SSW 0.7 2.3 L SW 0.8 2.0 M WSW 1.6 1.6 4.5 N W 1.8 3.2 P WNW 1.6 3.6 Q NW 0.9 3.7 -

R NNW 0.9 1.4 5.0 E. Errata Data There is no errata data for 2011 21 of 200

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.

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, 14 out of 18 analytes met the specified acceptance criteria. Three analytes did not meet the specified acceptance criteria for the following reason:

22 of 200

1. Teledyne Brown Engineering's Analytics March 2011 Cr-51 in milk result of 398 pCi/L was higher than the known value of 298 pCi/L, resulting in a found to known ratio of 1.34. NCR 11-13 was initiated to investigate this failure. There was a slightly high bias in all the gamma activities. The June gamma results in milk did not show a high bias. No further action was required.

2. Teledyne Brown Engineering's ERA May 2011 Gross Alpha in water result of 64.1 pCi/L was higher than the known value of 50.1 pCi/L, which exceeded the upper control limit of 62.9 pCi/L. NCR 11-08 was initiated to investigate this failure. The solids on the planchet exceeded 100 mg, which was beyond the range of the efficiency curve.

Teledyne Brown Engineering's MAPEP March 2011 Gross Alpha in air particulate result of 0.101 Bq/sample was lower than the known value of 0.659 Bq/sample, which exceeded the lower control limit of 0.198 Bq/sample. NCR 11-11 was initiated to investigate this failure. The air particulate filter was counted on the wrong side.

3. Teledyne Brown Engineering's ERA November 2011 Sr-89 in water result of 81.0 pCi/L was higher than the known value of 69.7 pCi/L, which exceeded the upper control limit of 77.9 pCi/L. NCR 11-16 was initiated to investigate this failure. The TBE reported value to known ratio of 1.16 fell within the acceptable range of +/- 20%, which TBE considers acceptable.

4. Teledyne Brown Engineering's MAPEP March 2011 Sr-90 in soil, air particulate and vegetation were non-reports that were evaluated as failed. NCR 11-11 was initiated to investigate these failures.

MAPEP evaluated the non-reports as failed due to not reporting a previously reported analyte.

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

23 of 200

Intentionally left blank 24 of 200

APPENDIX A RADIOLOGICAL ENVIRONMENTAL MONITORING REPORT

SUMMARY

25 of 200

26 of 200 TABLE A-1 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANNUAL

SUMMARY

FOR BYRON NUCLEAR GENERATION STATION, 2011 Name of Facility: BYRON DOCKET NUMBER: 50-454 & 50-455 Location of Facility: BYRON, IL REPORTING PERIOD: 2011 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 21 4 4.7 4.9 4.9 BY-29 CONTROL 0 (PCI/LITER) (10/11) (10/10) (10/10) BYRON - UPSTREAM (3.5/5.9) (2.9/7.6) (2.9/7.6) 3.0 MILES N OF SITE H-3 200 387 <LLD 387 BY-12 INDICATOR 0 (3/4) (3/4) OREGON POOL OF ROCK RIVER - DOWNSTREAM (225/584) (225/584) 4.5 MILES SSW OF SITE GAMMA 21 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'

I---

0 0O 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-1 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANNUAL

SUMMARY

FOR BYRON NUCLEAR GENERATION STATION, 2011 Name of Facility: BYRON DOCKET NUMBER: 50-454 & 50-455 Location of Facility: BYRON, IL REPORTING PERIOD: 2011 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 CS-134 15 <LLD <LLD CS-137 18 <LLD <LLD BA- 140 60 <LLD <LLD 0 I`'Q 0-,,

0 LA-140 15 <LLD <LLD 0

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

TABLE A-1 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANNUAL

SUMMARY

FOR BYRON NUCLEAR GENERATION STATION, 2011 Name of Facility: BYRON DOCKET NUMBER: 50-454 & 50-455 Location of Facility: BYRON, IL REPORTING PERIOD: 2011 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 24 200 <LLD NA 0 (PCI/LITER)

GAMMA 24 MN-54 15 <LLD NA 0 CO-58 15 <LLD NA 0 FE-59 30 <LLD NA 0 CO-60 15 <LLD NA 0 ZN-65 30 <LLD NA 0 0

-b 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, 2011 Name of Facility: BYRON DOCKET NUMBER: 50-454 & 50-455 Location of Facility: BYRON, IL REPORTING PERIOD: 2011 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 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 t.J 0

0O FISH GAMMA 8 (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, 2011 Name of Facility: BYRON DOCKET NUMBER: 50-454 & 50-455 Location of Facility: BYRON, IL REPORTING PERIOD: 2011 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)

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 01 CS-134 130 <LLD <LLD

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

TABLE A-1 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANNUAL

SUMMARY

FOR BYRON NUCLEAR GENERATION STATION, 2011 Name of Facility: BYRON DOCKET NUMBER: 50-454 & 50-455 Location of Facility: BYRON, IL REPORTING PERIOD: 2011 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 <LLD 0 CO-58 NA <LLD <LLD 0 FE-59 NA <LLD <LLD 0 0

tQ CO-60 NA <LLD <LLD 0

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

TABLE A-i RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANNUAL

SUMMARY

FOR BYRON NUCLEAR GENERATION STATION, 2011 Name of Facility: BYRON DOCKET NUMBER: 50-454 & 50-455 Location of Facility: BYRON, IL REPORTING PERIOD: 2011 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 <LLD 0 (PCI/KG DRY)

NB-95 NA <LLD <LLD 0 ZR-95 NA <LLD <LLD 0 CS- 134 150 <LLD <LLD 0 CS-137 180 <LLD 166 166 BY-29 CONTROL 0 (1/2) (1/2) BYRON - UPSTREAM 3.0 MILES N OF SITE BA-140 NA <LLD <LLD

(-JJ 0a 0

0o LA- 140 NA <LLD <LLD 0

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

TABLE A-i RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANNUAL

SUMMARY

FOR BYRON NUCLEAR GENERATION STATION, 2011 Name of Facility: BYRON DOCKET NUMBER: 50-454 & 50-455 Location of Facility: BYRON, IL REPORTING PERIOD: 2011 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 20 20 21 BY-24 INDICATOR 0 (E-3 PCI/CU.METER) (364/364) (52/52) (52/52) BYRON NEARSITE SOUTHWEST (7/45) (8/36) (7/38) 0.7 MILES SW OF SITE 00 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

I'Q 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-I RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANNUAL

SUMMARY

FOR BYRON NUCLEAR GENERATION STATION, 2011 Name of Facility: BYRON DOCKET NUMBER: 50-454 & 50-455 Location of Facility: BYRON, IL REPORTING PERIOD: 2011 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 PCI/CU.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 (E-3 PCI/CU.METER) 1-131 70 77 75 85 BY-21 INDICATOR 0 (22/364) (4/52) (3/52) BYRON NEARSITE NORTH 0

(36/116) (41/105) (63/107) 0.3 MILES N OF SITE 0-MILK 1-131 57 I <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-I RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANNUAL

SUMMARY

FOR BYRON NUCLEAR GENERATION STATION, 2011 Name of Facility: BYRON DOCKET NUMBER: 50-454 & 50-455 Location of Facility: BYRON, IL REPORTING PERIOD: 2011 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 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

0'-

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, 2011 Name of Facility: BYRON DOCKET NUMBER: 50-454 & 50-455 Location of Facility: BYRON, IL REPORTING PERIOD: 2011 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 II (PCI/KG WET) MN-54 NA <LLD <LLD 0 CO-58 NA <LLD <LLD 0 0

t'J 0

O 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-1 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANNUAL

SUMMARY

FOR BYRON NUCLEAR GENERATION STATION, 2011 Name of Facility: BYRON DOCKET NUMBER: 50-454 & 50-455 Location of Facility: BYRON, IL REPORTING PERIOD: 2011 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 00 00 00 CS-13'7 80 <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, 2011 Name of Facility: BYRON DOCKET NUMBER: 50-454 & 50-455 Location of Facility: BYRON, IL REPORTING PERIOD: 2011 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 364 NA 25 23 29 BY-107-1 INDICATOR (MILLI-ROENTGEN/QTR.) (356/356) (8/8) (4/4)

(16/34) (16/29) (26/32) 1.4 MILES SE 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)

Intentionally left blank 40 of 200

APPENDIX B LOCATION DESIGNATION, DISTANCE & DIRECTION, AND SAMPLE COLLECTION & ANALYTICAL METHODS 41 of 200

42 of 200 TABLE B-i: Radiological Environmental Monitoring Program - Sampling Locations, Distance and Direction, Byron Nuclear Generating Station, 2011 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 Southeast 0.4 miles SE BY-23 Byron Nearsite South 0.6 miles S BY-24 Byron Nearsite Southwest 0.7 miles SW E. Fish BY-29 Byron, Upstream (control) 3.0 miles N BY-31 Byron, Discharge 2.6 miles WNW F. Sediment BY-12 Oregon Pool of Rock River, Downstream 4.6 miles SSW BY-34 Rock River, Upstream of Discharge (control) 2.6 miles WNW G. Vegetation Quadrant 1 5186 N. Cox Road, Stillman Valley 4.9 miles ENE Quadrant 2 6274 Brick Road, Oregon 4.7 miles SE Quadrant 3 2522 Pleasant Grove Road, Oregon 1.6 miles S Quadrant 4 2770 Buckingham Road, Byron 5.3 miles N Control 3933 South Bend Road, New Mulford 10.8 miles NE 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-I 43 of 200

TABLE B-1: Radiological Environmental Monitoring Program - Sampling Locations, Distance and Direction, Byron Nuclear Generating Station, 2011 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-1 12-3 and -4 0.8 miles WSW BY-113-1 and -2 0.7 miles W BY-114-1 and -2 0.8 miles WNW BY-115-1 and -2 1.0 miles NW BY-116-1 and -2 1.4 miles NNW BY-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 200

TABLE B-1: Radiological Environmental Monitoring Program - Sampling Locations, Distance and Direction, Byron Nuclear Generating Station, 2011 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 200

TABLE B-2: Radiological Environmental Monitoring Program - Summary of Sample Collection and Analytical Methods, Byron Nuclear Generating Station, 2011 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-201 1 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-201 1 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 CaF2 elements.

B-4 46 of 200

Figure B-1 Inner and Outer Ring TLD Locations of the Byron Nuclear Generating Station, 2011 B-5 47 of 200

A

/

U~TOPGA~ 7TAT RNE.U UURVES I 0 12 1 MN 0 AIROMiPLHO LDTION Figure B-2 Onsite Air Sampling Locations of the Byron Nuclear Generating Station, 2011 B-6 48 of 200

BYRDN Mr. 72 LEAF mUvm VALLEMY wr.

MORRS 1I 2I aS 4I 6I MILES a

2 4 H] II 10 KNI

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Air Sampling L*cai*xn E B)rcM Station Figure B-3 Offsite Air Sampling Locations of the Byron Nuclear Generating Station, 2011 B-7 49 of 200

OFFSITE DOSE CALCULATION MANUAL BYRON STATION 0 FISH_______________________ __

A MLK FIGURE 6-4 o SE0IMENT

+ WATER INGESTION AND WATERBORNE EXPOSURE A BYRON STATION PATHWAY SAMPLE LOCATIONS o PLANT LIQUID DISCHARGE Figure B-4 Ingestion and Waterborne Exposure Pathway Sampling Locations of the Byron Nuclear Generating Station, 2011 B-8 50 of 200

APPENDIX C DATA TABLES AND FIGURES PRIMARY LABORATORY 51 of 200

52 of 200 TABLE C-1.1 CONCENTRATIONS OF GROSS BETA IN SURFACE WATER SAMPLES COLLECTED IN THE VICINITY OF BYRON NUCLEAR GENERATING STATION, 2011 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION BY-12 BY-29 PERIOD 1/l/2011 -01/31/11 (1) (1) 02/15/11 - 02/22/11 4.2 + 2.2 (1) (1) 03/01/11 - 03/29/11 3.5 + 2.0 5.4 +/-2.1 04/05/11 - 04/26/11 3.8 + 2.3 3.7 +/-2.2 05/03/11 - 05/31/11 5.2 + 2.2 4.7 +/-2.2 06/07/11 - 06/28/11 4.4 + 2.1 5.1 +/-2.1 07/05/11 - 07/25/11 5.5 + 2.7 7.6 +/-2.8 08/02/11 - 08/30/11 5.7 + 1.7 5.7 +/-1.6 09/06/11 - 09/27/11 4.6 + 2.5 5.2 +/-2.5 10/04/11 - 10/25/11 < 2.8 3.6 +/-1.9 11/01/11 - 11/29/11 5.9 +/- 2.0 5.4 +/-2.8 12/06/11 - 12/27/11 4.1 + 1.5 2.9 +/-1.5 MEAN 4.7 +/- 1.7 4.9 +/-2.6 TABLE C-I.2 CONCENTRATIONS OF TRITIUM IN SURFACE WATER SAMPLES COLLECTED IN THE VICINITY OF BYRON NUCLEAR GENERATING STATION, 2011 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION BY-12 BY-29 PERIOD 03/01/11 - 03/29/11 (1) < 164 162 (1) 04/05/11 - 06/28/11 (1) 225 +/- 106 166 07/05/11 - 09/27/11 (1) 584 +/- 143 189 10/04/11 - 12/27/11 352 ::! 128 183 MEAN 387 +/- 364

THE MEAN AND 2 STANDARD DEVIATION VALUES ARE CALCULATED USING THE POSITIVE VALUES (1) SEE PROGRAM EXCEPTIONS SECTION FOR EXPLANATION C-I 53 of 200

TABLE C-l.3 CONCENTRATIONS OF GAMMA EMITTERS IN SURFACE WATER SAMPLES COLLECTED IN THE VICINITY OF BYRON NUCLEAR GENERATING STATION, 2011 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA SITE 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 1/1/2011 - 01/31/ /11 (1) 02/15/11 - 02/22//11 (1) <3 <3 <8 <3 <6 <3 <6 15 <3 <3 < 28 <9 03/01/11 - 03/29//11 <1 <1 <3 <1 <2 <1 <2 14 <1 <1 < 17 <5 04/05/11 - 04/26//11 <1 <1 <2 <1 <2 <1 <2 12 <1 <1 < 14 <4 05/03/11 - 05/31/ /11 <1 <2 <5 <2 <3 <2 <4 12 <1 <2 < 43 < 13 06/07/11 - 06/28//11 <2 <2 <5 <2 <4 <3 <5 15 <2 <2 < 24 <5 07/05/11 - 07/25/ /11 <3 <3 <7 <3 <6 <4 <5 13 <3 <3 < 24 <7 08/02/11 - 08/30//11 <2 <2 <5 <2 <4 <2 <4 13 <2 <2 < 20 <6 09/06/11 - 09/27//11 <2 <2 <4 <2 <4 <2 <3 8 <2 <2 < 16 <5 10/04/11 - 10/25//11 <3 <3 <7 <3 <6 <4 <5 14 <3 <3 < 26 <9 11/01/11 - 11/29/ /11 <2 <2 <6 <2 <4 <3 <4 14 <2 <2 < 23 <7 12/06/11 -12/27/ /11 <2 <3 <6 <2 <5 <3 <2

<5 13 <2 < 23 <7 t'Q MEAN BY-29 1/1/2011 - 01/31/11 (1) 02/15/11 - 02/22/11 (1) 03/01/11 - 03/29/11 <1 <1 <2 <1 <2 <1 <2 <11 <1 <1 < 14 <5 04/05/11 - 04/26/11 <1 <1 <3 <1 <2 <1 <2 < 14 <1 <1 < 17 <5 05/03/11 - 05/31/11 <2 <2 <5 <1 <3 <2 <4 < 12 < 2 <2 < 46 < 12 06/07/11 - 06/28/11 <2 <2 <4 <2 <5 <2 <4 < 11 <2 <2 < 18 <6 07/05/11 - 07/25/11 <3 <4 <7 <3 <6 <4 <6 < 15 <3 <3 < 29 <9 08/02/11 - 08/30/11 <2 <2 <4 <2 <3 <2 <3 < 11 <2 <2 < 18 <5 09/06/11 - 09/27/11 <2 <2 <4 <2 <4 <2 <3 <7 <1 <2 < 14 <5 10/04/11 - 10/25/11 <3 <3 <7 <2 <5 <4 <5 < 13 <3 <3 < 24 <8 11/01/11 - 11/29/11 <3 <3 <5 <3 <5 <3 <5 < 14 <2 <3 < 25 <8 12/06/11 - 12/27/11 <2 <3 <6 <3 <5 <3 <5 < 14 <2 <2 < 23 <8 MEAN

(

(1) SEE PROGRAM EXCEPTIONS SECTION FOR EXPLANATION

TABLE C-I1.1 CONCENTRATIONS OF TRITIUM IN GROUND WATER SAMPLES COLLECTED IN THE VICINITY OF BYRON NUCLEAR GENERATING STATION, 2011 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION BY-14-1 BY-18-1 BY-32 BY-35 BY-36 BY-37 PERIOD 01/11/11 - 01/11/11

174 < 170 < 171

175 < 171

170 04/12/11 - 04/12/11 < 192 < 194 < 191 < 178 < 177 < 177 07/12/11 -07/12/11 < 162 < 166

165 < 164 < 162 < 163 10/11/11 -10/11/11 < 185 < 185 < 185 < 184 < 194 < 179 MEAN C-3 55 of 200

TABLE C-11.2 CONCENTRATIONS OF GAMMA EMITTERS IN GROUND WATER SAMPLES COLLECTED IN THE VICINITY OF BYRON NUCLEAR GENERATING STATION, 2011 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA SITE 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 01/11/11 - 01/11/ /11 <3 <4 <8 <3 <8 <4 <7 <9 <4 <4 < 21 <7 04/12/11 - 04/12//11 <1 <2 <4 <1 <3 <2 <3 < 13 <1 <1 < 20 <6 07/12/11 - 07/12//11 <8 <6 < 14 <6 < 16 <7 < 12 < 13 <7 <8 < 28 < 10 10/11/11 - 10/11/ /11 <5 <5 < 11 <5 < 13 <6 < 10 <8 <5 <5 < 24 < 10 MEAN BY-18-1 01/11/11 01/11/11 <5 <5 < 11 <5 < 11 <5 <8 < 10 <5 <5 < 29 <6 04/12/11 04/12/11 <2 <2 <4 <1 <3 <2 <3 < 13 <1 <2 < 20 <6 07/12/11 07/12/11 <6 <6 < 16 <8 < 10 <8 < 12 < 11 <7 <5 < 35 <6 10/11/11 10/11/11 <6 <6 < 12 <6 <9 <6 < 12 <9 <5 <7 < 27 <9 MEAN BY-32 01/11/11 - 01/11/11 <5 <6 <9 <5 < 11 <6 < 11 < 12 <5 <5 < 28 <8 04/12/11 - 04/12/11 <1 <1 <3 <1 <2 <1 <2 <9 <1 <1 < 15 <5 07/12/11 - 07/12/11 <7 <7 < 15 <7 < 16 <9 < 14 < 13 <8 <8 < 37 < 11 10/11/11 - 10/11/11 <5 <6 < 11 <5 < 12 <7 <9 < 10 <5 <6 < 24 < 10 MEAN BY-35 01/11/11 01/11/11 <3 <4 <9 <4 <8 <5 <7 <9 <4 <4 < 22 <6 04/12/11 04/12/11 <1 <.2 <4 <1 <3 <2 <3 < 14 <1 <2 < 21 <6 07/12/11 07/12/11 <7 <7 < 17 <6 < 13 <6 < 11 < 10 <6 <6 < 33 < 11 10/11/11 10/11/11 <7 <7 < 16 <7 < 16 <9 < 12 < 13 <6 <8 < 37 < 12 MEAN BY-36 01/11/11 01/11/11 <6 <5 < 12 <6 < 11 <6 < 10 < 10 <5 <5 < 27 <8 04/12/11 04/12/11 <2 <2 <5 <2 <3 <2 <3 < 14 <2 <2 < 21 <7 07/12/11 07/12/11 <7 <8 < 15 <7 < 13 <8 < 14 < 11 <6 <7 < 25 < 11

(-I' ON 10/11/11 10/11/11 <7 <7 < 14 <8 < 14 <8 < 10 < 11 <6 <8 < 26 < 13 0

MEAN 0

TABLE C-11.2 CONCENTRATIONS OF GAMMA EMITTERS IN GROUND WATER SAMPLES COLLECTED IN THE VICINITY OF BYRON NUCLEAR GENERATING STATION, 2011 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA SITE 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-37 01/11/11 - 01/11/11 <5 <4 <11 <5 < 10 <4 <8 < 11 <4 <5 < 26 <7 04/12/11 - 04/12/11 <1 <1 <3 <1 <2 <1 <2 < 10 <1 <1 < 16 <4 07/12/11 - 07/12/11 <7 <7 < 14 <6 < 12 <7 <13 < 13 <7 <7

27 <12 10/11/11 - 10/11/11 <6 <6 < 14 <5 < 13 <8 <9 <11 <6 <7 < 32 < 11 MEAN l-1

TABLE C-II1.1 CONCENTRATIONS OF GAMMA EMITTERS IN FISH SAMPLES COLLECTED IN THE VICINITY OF BYRON NUCLEAR GENERATING STATION, 2011 RESULTS IN UNITS OF PCI/KG WET +/- 2 SIGMA SITE COLLECTION Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 Cs-134 Cs-137 Ba-140 La-140 PERIOD BY-29 Common carp 05/05/11 < 31

36

80

30 < 77 < 35

58

25

23

330 < 110 River Carpsucker 05/05/11 < 47

58

128

48 < 93 < 59

89 < 45

38

592

177 Common Carp 10/26/11 < 63 < 58 < 144 < 78 < 128 < 76

124 < 64 < 58 < 638 < 197 Smallmouth Bass 10/26/11 < 77

67 < 169 < 73 < 160 < 93 < 145 < 61 < 71 < 670

266 MEAN BY-31 Common carp 05/05/11 < 73 < 99 < 197 < 84 < 188 < 84 < 163 < 102 < 78 < 946 < 321 Quillback 05/05/11

25 < 32 < 62 < 14 < 71 < 33 < 62 < 29 < 30

380 < 134 Common Carp 10/26/11

67 < 59

191 < 68 < 127 < 77 < 113 < 44 < 52 < 657

199 Golden Redhorse 10/26/11 < 53 < 62 < 130 < 63 < 115

66 < 106

50 < 46 < 582 < 173 MEAN 00 co 0

0o

TABLE C-IV.1 CONCENTRATIONS OF GAMMA EMITTERS IN SEDIMENT SAMPLES COLLECTED IN THE VICINITY OF BYRON NUCLEAR GENERATING STATION, 2011 RESULTS IN UNITS OF PCI/KG DRY +/- 2 SIGMA SITE COLLECTION Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 Cs-134 Cs-137 Ba-140 La-140 PERIOD BY-12 05/24/11 < 53 < 50 < 141 < 64 < 122 < 71 < 124 < 50 < 64 < 875 < 184 10/18/11 < 65 < 70 < 151 < 64 < 123 < 80 < 130 < 66 < 76 < 474 < 131 MEAN BY-29 05/24/11 (1) < 65 < 70 < 157 < 55 < 119 < 77 < 127 < 46 166 +/- 65 < 926 < 299 10/18/11 (1) < 42 < 45 < 101 < 48 < 86 < 45 < 68 < 32 < 45 < 335 < 109 MEAN ci 0

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

TABLE C-V.1 CONCENTRATIONS OF GROSS BETA IN AIR PARTICULATE SAMPLES COLLECTED IN THE VICINITY OF BYRON NUCLEAR GENERATING STATION, 2011 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 12/28/10 -01/04/11 14 +/- 4 11 +/- 4 17 +/- 4 14 +/- 4 12 +/- 4 16 +/- 4 15 +/- 4 9 +/- 4 01/04/11 -01/11/11 35 +/- 4 35 +/- 4 34 +/- 4 26 +/- 4 30 +/- 4 28 +/- 4 31 +/- 4 34 +/- 4 01/11/11 -01/18/11 28 +/- 5 24 +/- 5 28 +/- 5 34 +/- 5 32 +/- 5 31 +/- 5 25 +/- 5 32 +/- 5 01/18/11 -01/25/11 26 +/- 5 29 +/- 5 28 +/- 5 38 +/- 6 31 +/- 6 28 +/- 5 31 +/- 6 32 +/- 6 01/25/11 -02/01/11 25 +/- 5 25 +/- 5 30 +/- 5 30 +/- 5 27 +/- 5 29 +/- 5 26 +/- 5 30 +/- 5 01/31/11 -02/08/11 20 +/- 4 20 +/- 4 16 +/- 4 25 +/- 5 (1) 18 +/- 4 17 +/- 4 18 +/- 4 18 +/- 4 02/08/11-02/15/11 22 +/-5 22 +/-5 25 +/-5 27 +/-5 24 +/-5 22 +/-5 26 +/-5 20+/- 4 02/15/11 -02/22/11 15 +/- 4 21 +/- 4 15 +/- 4 16 +/- 4 19 +/- 4 17 +/- 4 16 +/- 4 16 +/- 4 02/22/11 -03/01/11 22 +/- 5 20 +/- 5 21 +/- 5 19 +/- 5 14 +/- 5 17 +/- 5 16 +/- 5 28 +/- 6 03/01/11 -03/08/11 17 +/- 4 16 +/- 4 20 +/- 4 12 +/- 4 16 +/- 4 13 +/- 4 17 +/- 4 16 +/- 4 03/08/11 -03/15/11 15 +/- 5 16 +/- 5 17 +/- 5 15 +/- 5 13 +/- 5 14 +/- 5 12 +/- 5 15 +/- 5 03/15/11 -03/22/11 20 +/-5 21 +/-5 21 +/-5 23 +/-5 28 +/-6 24 +/-5 25 +/-5 21+/- 5 03/22/11-03/29/11 22 +/-5 22 +/-5 23 +/-5 22 +/-5 28 +/-5 26 +/-5 29 +/-5 22 +/-5 (1) 03/29/11-04/05/11 27 +/-5 27 +/-5 28 +/-5 28 +/-5 25 +/-5 26 +/-5 27 +/-5 30 +/-5 04/05/111 04/12/11 15 +/- 5 17 +/- 5 17 +/- 5 16 +/- 5 15 +/- 5 21 +/- 5 17 +/- 5 17 +/- 5 04/12/11 -04/19/11 17 +/- 4 18 +/- 4 18 +/- 4 17 +/- 4 19 +/- 4 15 +/- 4 13 +/- 4 22 +/- 5 04/19/11 -04/26/11 9 +/- 4 12 +/- 4 10 +/- 4 10 +/- 4 22 +/- 5 13 +/- 5 12 +/- 4 10 +/- 4 04/26/111- 05/03/11 9 +/- 3 14 +/- 4 12 +/- 4 12 +/- 4 11 +/- 4 10 +/- 3 10 +/- 3 11 +/- 4 05/03/11 -05/10/11 11 +/- 4 13 +/- 4 14 +/- 4 16 +/- 4 15 +/- 4 12 +/- 4 12 +/- 4 13 +/- 4 05/10/11 -05/17/11 16 +/- 5 12 +/- 4 13 +/- 4 14 +/- 5 12 +/- 4 11 +/- 4 11 +/- 4 12 +/- 4 05/17/11 - 05/24/11 7 +/- 4 9 +/- 4 (1) 8 +/- 4 (1) 11 +/- 4 (1) 9 +/- 4 10 +/- 4 (1) 10 +/- 4 9 +/- 4 05/24/11 -05/31/11 10 +/- 4 11 +/- 4 8 +/- 4 12 +/- 4 9 +/- 4 8 +/- 3 9 +/- 4 9 +/- 4 05/31/11 -06/07/11 18 +/- 5 20 +/- 5 18 +/- 5 18 +/- 5 22 +/- 5 16 +/- 4 20 +/- 5 18 +/- 4 (1) 06/07/111 06/14/11 11 +/- 4 (1) 12 +/- 4 9 +/- 4 11 +/- 4 15 +/- 4 7 +/- 4 11 +/- 4 8 +/- 4 06/14/11 -06/21/11 15 +/- 5 11 +/- 5 11 +/- 5 17 +/- 5 13 +/- 5 12 +/- 5 18 +/- 5 12 +/- 5 06/21/11 -06/28/11 8 +/- 4 10 +/- 4 10 +/- 4 9 +/- 4 9 +/- 4 7+/- 4 9 +/- 4 8 +/- 4 06/28/11 -07/05/11 17 +/- 4 19 +/- 4 20 +/- 4 20 +/- 4 19 +/- 4 16 +/- 4 15 +/- 4 19 +/- 4 07/05/11 -07/12/11 16 +/- 4 18 +/- 4 21 +/- 4 20 +/- 4 21 +/- 4 18 +/- 4 22 +/- 5 19 +/- 4 07/12/11 -07/19/11 21 +/- 5 (1) 21 +/- 5 (1) 22 +/- 5 (1) 23 +/- 5 (1) 23 +/- 5 (1) 17 +/- 4 (1) 18 +/- 4 (1) 21 +/- 4 (1) 07/19/11 -07/25/11 16 +/- 4 18 +/- 5 18 +/- 5 23 +/- 5 17 +/- 5 19 +/- 5 17 +/- 5 17 +/- 5 07/25/11 -08/02/11 25 +/-4 27 +/-5 24 +/-4 24 +/-4 27 +/-5 20 +/-4 28 +/-5 21+/- 4 08/02/11-08/09/11 16 +/-5 17 +/-5 15 +/-4 20 +/-5 24 +/-5 20 +/-5 20 +/-5 20+/- 5 08/09/11 -08/16/11 14 +/- 4 15 +/- 4 14 +/- 4 22 +/- 5 20 +/- 4 18 +/- 4 16 +/- 4 22 +/- 5 08/16/11 -08/23/11 23 +/- 5 19 +/- 5 19 +/- 5 18 +/- 5 15 +/- 5 15 +/- 5 18 +/- 5 23 +/- 5 08/23/11 -08/30/11 20 +/- 5 18 +/- 4 15 +/- 4 17 +/- 4 21 +/- 5 15 +/- 4 14 +/- 4 19 +/- 4 08/30/11-09/06/11 39 +/-6 33 +/-5 41 +/-6 26 +/-5 35 +/-6 27 +/-5 30+/-15 30+/- 6 09/06/11 -09/13/11 22 +/- 5 19 +/- 4 19 +/- 4 31 +/- 5 19 +/- 4 20 +/- 4 18 +/- 4 22 +/- 4 09/13/11 -09/20/11 17 +/- 4 14 +/- 4 17 +/- 4 16 +/- 4 14 +/- 4 16 +/- 4 16 +/- 4 18 +/- 4 09/20/11 -09/27/11 14 +/- 4 17 +/- 4 16 +/- 4 17 +/- 4 16 +/- 4 17 +/- 4 16 +/- 4 15 +/- 4 09/27/11 -10/04/11 18 +/- 4 19 +/- 4 15 +/- 4 19 +/- 4 21 +/- 4 15 +/- 4 17 +/- 4 20 +/- 4 10/04/11 -10/11/11 43 +/- 6 37 +/- 6 39 +/- 6 35 +/- 6 45 +/- 6 44 +/- 6 36 +/- 6 36 +/- 6 10/11/11 -10/18/11 21 +/- 4 19 +/- 4 21 +/- 4 21 +/- 4 20 +/- 4 15 +/- 4 23 +/- 5 17 +/- 4 10/18/11- 10/25/11 18 +/- 5 20 +/- 5 18 +/- 5 19 +/- 5 16 +/- 5 (1) 11 +/- 4 14 +/- 4 16 +/- 4 10/25/11 -11/01/11 22 +/- 5 22 +/- 5 21 +/- 5 23 +/- 5 22 +/- 5 19 +/- 5 24 +/- 5 21 +/- 5 11/01/11 -11/08/11 27 +/- 5 30 +/- 5 34 +/- 5 33 +/- 5 26 +/- 5 26 +/- 5 35 +/- 5 29 +/- 5 11/08/111 11/15/11 29 +/- 5 29 +/- 5 30 +/- 5 29 +/- 5 26 +/- 5 32 +/- 6 30 +/- 5 28 +/- 5 11/15/11 -11/22/11 8+/- 4 7 +/- 4 8 +/- 4 7 +/- 4 13 +/- 4 8 +/- 4 14 +/- 4 11 +/- 4 11/22/11 -11/29/11 14 +/- 5 15 +/- 5 15 +/- 5 18 +/- 5 16 +/- 5 15 +/- 5 15 +/- 5 16 +/- 5 11/29/11 12/06/11 15 +/- 5 20 +/- 5 16 +/- 5 18 +/- 5 17 +/- 5 21 +/- 5 16 +/- 5 14 +/- 5 12/06/11 -12/13/11 24 +/- 5 25 +/- 6 23 +/- 5 28 +/- 6 25 +/- 6 25 +/- 6 16 +/- 5 22 +/- 5 12/13/11 -12/20/11 34 +/- 5 35 +/- 5 38 +/- 5 36 +/- 5 36 +/- 5 30 +/- 5 36 +/- 5 36 +/- 5 12/20/11 -12/27/11 18 +/-4 18+/-4 17 +/-4 19 +/-4 22 +/-4 22 +/-4 24+/-:t4 18+/- 4 MEAN 19 +/- 15 20 +/- 14 20 +/- 16 21 +/- 15 20 +/- 15 19 +/- 15 19 +/- 15 20 +/- 15

THE MEAN AND 2 STANDARD DEVIATION VALUES ARE CALCULATED USING THE POSITIVE VALUES (1) SEE PROGRAM EXCEPTIONS SECTION FOR EXPLANATION C-8 C-8 60 of 200

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, 2011 RESULTS IN UNITS OF E-3 PCI/CU METER +/- 2 SIGMA GROUP I - NEARSITE LOCATIONS GROUP II - FAR FIELD LOCATIONS GROUP III - CONTROL LOCATIONS COLLECTION MIN MAX MEAN +/- COLLECTION MIN MAX MEAN + COLLECTION MIN MAX MEAN +

PERIOD 2SD PERIOD 2SD PERIOD 2SD 12/28/10 - 01/31/11 11 27 +/- 15 12/28/10 02/01/11 12 32 26 +/- 13 12/28/10l - 02/01/11 9 34 27 + 21 01/31/11 - 03/01/11 15 27 20 +/- 7 02/01/11 03/01/11 14 26 19 +/- 7 02/01/11 03/01/11 16 28 21 +/- 11 03/01/11 - 03/29/11 12 23 19 +/- 7 03/01/11 03/29/11 12 29 20 +/- 14 03/01/11 03/29/11 15 22 19 +/- 7 03/29/11 - 05/03/11 9 28 17 +/- 12 03/29/11 05/03/11 10 27 17 + 12 03/29/11 05/03/11 10 30 18 +/- 17 05/03/11 - 05/31/11 7 16 12 +/- 6 05/03/11 05/31/11 8 15 11 +4 05/03/11 05/31/11 9 13 11+/- 4 05/31/11 - 06/28/11 8 20 13 +/- 8 05/31/11 06/28/11 7 22 13 + 10 05/31/11 06/28/11 8 18 12 9 06/28/11 - 08/02/11 16 27 21 +/- 6 06/28/11 08/02/11 15 28 20 +/-7 06/28/11 08/02/11 17 21 19+/- 3 08/02/11 - 08/30/11 14 23 18 +/- 5 08/02/11 08/30/11 14 24 18+/- 6 08/02/11 08/30/11 19 23 21 +4 08/30/11 - 09/27/11 14 41 22 +/- 18 08/30/11 09/27/11 14 35 20 +/- 14 08/30/11 09/27/11 15 30 21 +/- 14 09/27/11 - 11/01/11 15 43 23 +/- 16 09/27/11 11/01/11 11 45 23 +/- 21 09/27/11 11/01/11 16 36 22 +/- 17 11/01/11 - 11/29/11 7 34 21 +/-20 11/01/11 11/29/11 8 35 21 +/-18 11/01/11 11/29/11 11 29 21 +/- 18 11/29/11 - 12/27/11 15 38 24 +/- 16 11/29/11 12/27/11 16 36 24 +/- 14 11/29/11 12/27/11 14 36 22 +/- 18 12/28/10 - 12/27/11 7 43 20 +/- 15 12/28/10 - 12/27/11 7 45 20 +/- 15 12/28/10 - 12/27/11 8 36 20 +/- 15

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

TABLE C-V.3 CONCENTRATIONS OF GAMMA EMITTERS IN AIR PARTICULATE SAMPLES COLLECTED IN THE VICINITY OF BYRON NUCLEAR GENERATING STATION, 2011 RESULTS IN UNITS OF E-3 PCI/CU METER +/- 2 SIGMA SITE COLLECTION Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 Cs-134 Cs-137 Ba-140 La-140 PERIOD BY-01 12/28/10 - 03/29/11 <3 <5 < 17 <3 <9 <7 < 11 <3 <4 < 516 < 241 03/29/11 - 06/28/11 <3 <6 <18 <2 <7 <7 <9 <2 <2 < 1590

491 06/28/11 - 09/27/11 <3 <5 < 15 <2 <8 <5 <8 <4 <3 < 624 < 277 09/27/11 - 12/27/11 <2 <3 < 10 <2 <4 <3 <5 <2 <2 < 198 < 92 MEAN BY-04 12/28/10 - 03/29/11 <3 <6 <13 <2 <8 <5 <9 <3 <3

462 < 213 03/29/11 - 06128/11 <2 <7 < 16 <2 <6 <5 < 10 <2 <3 < 1620 < 333 06/28/11 - 09/27/11 <3 <5 < 13 <2 <7 <5 <9 <3 <2 < 739 < 368 09/27/11 - 12/27/11 <3 <4 < 12 <3 <8 <5 <8 <3 <3 < 224 < 114 MEAN BY-06 12/28/10 - 03/29/11 <2 <4 < 15 <3 <7 <5 <8 <3 <2 < 404 < 167 03/29/11 - 06/28/11 <4 <8 < 23 <3 <8 <7 < 15 <4 <3 < 2360 < 576 06/28/11 - 09/27/11 <2 <2 <8 <2 <4 <4 <7 <1 <2 < 438 < 140 09/27/11 - 12/27/11 <3 <3 < 14 <3 <6 <3 <7 <2 <2 < 222 < 97 MEAN BY-08 03/08/11 - 03115/11 < 30 < 33 < 75 < 43 < 77 < 35 < 79 < 32 < 34 < 251 < 65 03115/11 - 03122111 < 35 < 38 < 66 < 39 < 88 < 45 < 64 < 42 < 41 < 179 < 55 03122/11 - 03/29111 < 21 < 18 < 41 < 18 < 59 < 26 < 45 < 26 < 25 < 106 < 25 03/29/11 - 04/05/11 < 28 < 25 < 40 < 30 < 40 < 27 < 43 < 27 < 27 < 115 < 51 04/05/11 - 04/12/11 < 37 < 38 < 75 < 38 < 72 < 27 < 63 < 39 < 37 < 180 < 57 12/28/10 - 03/29/11 <2 <3

14 <3 <6 <4 <7 <2 <2 < 333 < 174 03/29/11 - 06/28/11 <2 <5

14 <2 <6 <6 < 11 <3 <2 < 1250 < 648 06/28/11 - 09/27/11 <4 <7 < 18 <3 < 10 <8 < 12 <4 <3 < 974 < 420 09/27/11 - 12/27/11 <3 <6 < 13 <3 < 10 <4 <7 <3 <3 < 329 < 109 MEAN C

0 BOLDED VALUES INDICATE ADDITIONAL SAMPLING DUE TO THE FUKUSHIMA EVENT 0

TABLE C-V.3 CONCENTRATIONS OF GAMMA EMITTERS INAIR PARTICULATE SAMPLES COLLECTED IN THE VICINITY OF BYRON NUCLEAR GENERATING STATION, 2011 RESULTS IN UNITS OF E-3 PCI/CU METER +/- 2 SIGMA SITE COLLECTION Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 Cs-134 Cs-137 Ba-140 La-140 PERIOD BY-21 12/28/10 - 03/29/ /11 <4 <5

16 <3 <8 <6 <11 3 <3

467 < 104 03/29/11 - 06/28/ /11 <3 <6

29 <4 <8 <8 < 14 3 <3 < 2140 < 740 06/28/11 - 09/27/ /11 <2 <5 < 16 <2 < 10 <7 < 11 3 <3 < 713

235 09/27/11 - 12/27//11 <3 <7 < 11 <3 <8 <5 <8 3 <3 < 295 < 112 MEAN BY-22 12/28/10 03/29/11 <4 <6 < 16 <3 <8 <6 <9 <3 <4 < 592

188 03/29/11 06/28/11 <3 <7 < 22 <3 <7 <7 < 11 <3 <2 < 2370 < 534 06/28/11 09/27/11 <1 <3 <9 <2 <4 <3 <4 <1 <1

512 < 228 09/27/11 12/27/11 <2 <4 <9 <2 <6 <4 <5 <2 <2 < 204 < 93 MEAN C)

BY-23 12/28/10 03/29/11 <2 <3 < 13 <2 <6 <3 <7 <2 <2

307 < 112 03/29/11 06/28/11 <2 <6 < 34 <4 < 10 <9 < 16 <4 <3 < 2710 < 1050 06/28/11 09/27/11 <2 <5 < 11 <2 <4 <5 < 11 <2 <2 < 715 < 259 09/27/11 12/27/11 <3 <4 < 14 <2 <7 <5 <9 <3 <3 < 254 < 87 MEAN BY-24 12/28/10 - 03/29/11 <4 <6 < 20 <4 <9 <7 < 11 <4 <4 < 469 < 142 03/29/11 - 06/28/11 <2 <5 < 20 <2 <7 <5 <9 <3 <2 < 1510 < 567 06/28/11 - 09/27/11 <3 <6 < 15 <3 <9 <9 < 10 <4 <3 < 1010 < 325 09/27/11 - 12/27/11 <3 <6 < 12 <2 <7 <6 <11 <3 <3

313 < 118 MEAN

TABLE C-VI.1 CONCENTRATIONS OF 1-131 IN AIR IODINE SAMPLES COLLECTED IN THE VICINITY OF BYRON NUCLEAR GENERATING STATION, 2011 RESULTS IN UNITS OF E-3 PCI/CU METER +/- 2 SIGMA COLLECTION GROUP I GROUP 11 GROUP III PERIOD BY-21 BY-22 B) ~-23 BY-24 BY-01 BY-04 BY-06 BY-08 12/28/10 -01/04/11

69

69

68

68

62

63

62

65

< 44

44

43

43

55

54

55

31 01/11/11 -01/18/11

68

68

68

68

69

69

69

69 01/18/11 -01/25/11

27

63

64 < 64

61

60

61

60 01/25/11 -012/0/11

62

26

62

63

46

39

39

39 01/31/11 -02/08/11

< 47

47

47

60 (1)

44

47

47 < 47 (1) 02/08/11 -02/15/11 < 46

46

46

45

41

42

42

42 02/15/11 -02/22/11

53

53

53

53

54

53

54

53 02/22/11 -03/01/11

68

68

68

68

67

67

67

69 03/01/111 03/08/11 < 43 < 43 < 43

18 < 37 < 37 < 37 < 36 03/08/11 -03/15/11 < 43

43

43

43

34

34

34

34 03/15/11 -03/22/11 (1) 85 +/- 44 (1) 63 +/- 45 (1) 82 +/- 47 (1) 87 +/- 38 (1) 64 +/- 48 (1) 94 +/- 46 (1) 36 +/- 35 (1) 100 +/- 56 03/22/11 -03/29/11 (1) 63 +/- 26 (1) 61 +/- 30 (1) 61 +/- 33 (1) 64 +/- 24 (1) 65 +/- 39 (1) 46 +/- 29 (1) 72 +/- 41 (1) 55 +/- 32 03/29/11 -04/05/11 (1) 107 +/- 38 (1) 116 +/- 64 (1) 104 +/- 42 (1) 95 +/- 36 (1) 78 +/- 46 (1) 77 +/- 26 (1) 113 +/- 29 (1) 105 +/- 38 04/05/11 -04/12/11 < 54

43 < 45 < 46 (1) 57 +/- 28 < 40

57 (1) 41 +/- 35 04/12/11 -04/19/11 < 43

33 < 57 < 40

41

36

46 < 43 04/19/11 -04/26/11

67

67 < 67 < 67

57

59

59

56 04/26/11 -05/03/11

66

66 < 65 < 65

56

53

54

29 05/03/11 -05/10/11

65 -c 65 < 66 < 66

68

68

68

65 05/10/11 -05/17/11 < 34

62 < 62 < 62

67

67

67

69 05/17/11 -05/24/11

62

63 (1) < 63 (1) < 64 (1)

67

70 (1)

67

65 05/24/11 -05/31/11

68

29 < 67 < 67

56

55

55

70 05/31/11 -06/07/11

45 < 45 < 45 < 45 < 64 < 65 < 65 < 64 (1) 06/07/11 -06/14/11

69 (1)

70 < 65 < 65

56

56

56

57 06/14/11 -06/21/11

63

63 < 63 < 35

56

56

56

64 06/21/11 -06/28/11

68

69 < 68 < 68

65

66

65

67 06/28/11 -07/05/11

67

67 < 67 < 67

65

63

63

61 07/05/11 -07/12/11

49 < 49 < 49 < 49

29

68

68

52 07/12/11 -07/19/11

45 (1)

45 (1) < 45 (1) < 46 (1)

34 (1)

34 (1)

34 (1) < 33 (1) 07/19/11 -07/25/11

61

67 < 67 < 67

62

34

62 < 64 07/25/11 -08/02/11

32

32 < 32 < 32

37

36

36

35 08/02/11 -08/09/11

65

59 < 59 < 59

66

40

66

68 08/09/11 -08/16/11

53

53 < 53 < 22 < 34

33

34

18 08/16/11 -08/23/11

65

66 < 66 < 66

18

65

28

67 08/23/11 -08/30/11 < 46

46 < 46 < 46

32

33

33

32 08/30/11 -09/06/11 < 69

68 < 68 < 68

58

57

58

59 09/06/11 -09/13/11

48 < 48 < 49 < 49

67

66

66

65 09/13/11 -09/20/11

54 < 54 < 54 < 54

33

33

33

24 09/20/11 -09/27/11

67

67 < 67 < 67 < 45 < 46 < 46

46 09/27/111 10/04/111 <7

22 < 22 <9

14

13

13

14 10/04/11 -10/11/11

53

53 < 53

53

57

57

57

55 10/11/11 -10/18/11

52

22 < 52

52

38

40

40

41 10/18/11 -10/25/11

66

66 < 67

67

68 (1)

66

66 < 64 10/25/11 -11/01/11

62

62 < 34

61

59

60

62

62 11/01/11 - 11/08/11

68

68 < 69

69

58

58

57

56 11/08/11 - 11/15/11

65

65 < 64

35

62

63

63

65 11/15/11 - 11/22/11 < 48

48 < 48

49

60

60

59

58 11/22/11 - 11/29/11

50 < 41 < 41 < 41

28

50

50

50 11/29/11 - 12/06/11

38

38 < 38

39

26

26

26

27 12/06/11 - 12/13/11

61

60 < 61

61

62

27

62

60 12/13/11 - 12/20/11

21

21 < 21

20

14

15

15

15 12/20/11 - 12/27/11

52

52 < 53

53

53

54

54

52 MEAN 85 +/-44 80 +/-63 83 +/-43 82 +/-33 66 +/- 18 72 +/-50 74 +/-77 75 +/-63

THE MEAN AND 2 STANDARD DEVIATION VALUES ARE CALCULATED USING THE POSITIVE VALUES (1) SEE PROGRAM EXCPETIONS SECTION FOR EXPLANATION C-12 C-12 64 of 200

TABLE C-VII.1 CONCENTRATIONS OF 1-131 IN MILK SAMPLES COLLECTED IN THE VICINITY OF BYRON NUCLEAR GENERATING STATION, 2011 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA CONTROL FARM INDICATOR FARM COLLECTION BY-26-1 I BY-20-1 BY-30-1 PERIOD 01/04/11 < 0.7 < 0.7 < 0.6 02/01/11

0.8 < 0.8 < 1.0 03/01/11 < 0.7 < 0.2 < 0.2 03/29/11 < 0.7 04/05/11 < 0.5 < 0.6 < 0.5 04/19/11 < 0.6 05/03/11 < 0.6 < 0.5 < 0.8 05/17/11 < 0.4 < 0.9 < 0.5 05/31/11 < 0.7 < 0.5 < 0.6 06/14/11 < 0.8 < 0.9 < 0.8 06/28/11 < 0.7 < 0.8 < 0.7 07/12/11 < 0.9 < 0.9 < 0.7 07/25/11 < 0.6 < 0.7 < 0.7 08/09/11 < 0.6 < 0.7 < 0.6 08/23/11 < 0.7 < 0.9 < 0.9 09/06/11 < 0.6 < 0.7 < 0.8 09/20/11 < 0.7 < 0.7 < 0.7 10/04/11 < 0.7 < 0.7 < 0.7 10/18/11

0.7 < 0.7 < 0.7 11/01/11 < 0.7 < 0.6 < 0.8 12/06/11 < 0.9 < 0.7 < 0.7 MEAN BOLDED VALUES INDICATE ADDITIONAL SAMPLING DUE TO THE FUKUSHIMA EVENT C-13 65 of 200

TABLE C-VII.2 CONCENTRATIONS OF GAMMA EMITTERS IN MILK SAMPLES COLLECTED IN THE VICINITY OF BYRON NUCLEAR GENERATING STATION, 2011 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA SITE COLLECTION Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 Cs-134 Cs-137 Ba-140 La- 140 PFpInn PERIOD BY-20-1 01/04/11 <6 <4 < 14 <6 < 11 <5 < 10 <5 <6 < 32 <8 02/01/11 <7 <7 < 18 <9

15 <7 < 14 <6 <8 < 37 < 11 03/01/11 <5 <5 < 11 <6 <12 <5 < 10 <4 <5 < 37

10 04/05/11 <5 <5 < 13 <5 < 12 <4 <8 <4 <5 < 43 < 15 05/03/11 <5 <5 < 13 <7 <11 <5 < 10 <5 <5 < 35 <9 05/17/11 <5 <4 < 13 <5 < 11 <5 <9 <4 <4 < 37 <9 05/31/11 <5 <5 < 12 <6 <11 <6 <9 <5 <5 < 47 < 14 06/14/11 <6 <6 < 15 <8 < 14 <6 < 11 <5 <6 < 36 < 10 06/28/11 <8 <8 < 18 < 10 < 20 < 10 < 17 <5 <8 < 54 < 13 07/12/11 <6 <6 < 12 <7 < 14 <6 <9 <4 <5

25 <8 07/25/11 <6 <7 < 18 <9 < 18 <7 <11 <6 <8 < 41 <8 08/09/11 <6 <6 < 13 <7 < 12 <6 < 10 <6 <5 < 31 <7 08/23/11 <7 <7 < 14 <8 <16 <6 < 12 <6 <7 < 34 <8

(-I 13 <6 < 10 <4 <9 <4 <5 < 23 <8 09/06/11 <4 <5 <

09/20/11 <8 <6 < 18 <8

20 <8 < 12 <6 <7 < 32 < 11 10/04/11 <8 <6 < 15 < 10 < 17 <7 < 13 <7 <9 < 39 <13 10/18/11 <6 <6 < 13 <8 < 17 <7 < 10 <6 <6

30 <9 11/01/11 <8 <6 < 17 <9 < 17 <7

12 <7 <7 < 30 < 10 12/06/11 <5 <6 < 13 <6 < 11 <5 <9 <5 <6 < 27 <5 MEAN ON ON 0

0'

TABLE C-VII.2 CONCENTRATIONS OF GAMMA EMITTERS IN MILK SAMPLES COLLECTED IN THE VICINITY OF BYRON NUCLEAR GENERATING STATION, 2011 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA SITE COLLECTION Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 Cs-134 Cs-137 Ba-140 La-140 PERIOD BY-26-1 01/04/11 <5 <5 < 12 <6 < 12 <5 <9 <4 <6 < 30 <8 02/01/11 <7 <6 *17 <8 < 16 <7 < 12 <7 <8 < 33 <8 03/01/11 <5 <6 <12 <5 <9 <5 <9 <4 <4 < 37 <9 03/29/11 <5 <6 < 13 <6 < 11 <7 < 11 <5 <5 < 50 < 15 04/05/11 <5 <4 < 13 <6 <13 <6 <9 <5 <5 < 47 < 12 05/03/11 <6 <6 < 17 <8 <16 <8 < 13 <4 <5 < 39 < 12 05/17/11 <5 <6 < 13 <5 < 12 <6 <9 <4 <5 < 39 <11 05/31/11 <5 <5 <15 <6 < 11 <7 < 11 <5 <5 < 52 < 15 06/14/11 <4 <5 < 12 <6 <11 <5 < 10 <4 <5 < 35 <9 06/28/11 <6 <5 < 17 <7 < 15 <7 < 11 <5 <7 < 44 <7 07/12/11 <8 <7 < 15 <8 < 16 <8 <11 <7 <9 < 32 <11 07/25/11 <6 <8 <19 <9 < 15 <7 < 11 <7 <6 < 44 < 12 08/09/11 <5 <5 < 11 <6 <12 <4 <7 <5 <5 < 25 <7

(-I 08/23/11 <7 <7 < 17 <9 < 20 <8 < 13 <8 <9 < 39 <10 09/06/11 <4 <5 < 11 <6 < 13 <5 <9 <5 <5 < 27 <8 09/20/11 <7 <7 < 16 <9 < 15 <7 < 13 <7 <7 < 37 < 10 10/04/11 <6 <7 <17 < 12 < 18 <7 < 14 <7 <8 < 43 < 11 10/18/11 <5 <6 < 15 <9 < 18 <6 < 13 <6 <7 < 35 < 11 11/01/11 <6 <6 < 12 <7 < 14 <6 <9 <5 <6 < 25 <6 12/06/11 <5 <5 < 13 <6 < 13 <5 <9 <6 <5 < 28 <8 MEAN 0

BOLDED VALUES INDICATE ADDITIONAL SAMPLING DUE TO THE FUKUSHIMA EVENT 0

0

TABLE C-VII.2 CONCENTRATIONS OF GAMMA EMITTERS IN MILK SAMPLES COLLECTED IN THE VICINITY OF BYRON NUCLEAR GENERATING STATION, 2011 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA SITE COLLECTION Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 Cs-134 Cs-137 Ba-140 La-140 PERIOD BY-30-1 01/04/11 <6 <6 < 14 <7 < 12 <6 < 10 <4 <6

30 < 10 02/01/11 <6 <7 <15 <8 < 13 <7 < 11 <5 <7 < 42 < 13 03/01/11 <4 <5 < 12 <5 <11 <6 <9 <4 <4 < 33 < 11 04/05/11 <5 <7 < 16 <6 < 12 <7 < 11 <5 <5

50 < 15 05/03/11 <5 <5 < 14 <6 <11 <7 <11 <5 <5 < 37 <9 05/17/11 <5 <5 < 14 <6 < 11 <6 <9 <5 <5

38 < 14 05/31/11 <6 <7 < 16 <7 < 13 <7 < 11 <6 <5 < 52 <13 06/14/11 <5 <5 < 12 <6 <9 <5 <9 <4 <5 < 40 < 11 06/28/11 <5 <6 < 14 <7 < 14 <7 <9 <5 <5 < 45 <10 07/12/11 <7 <7 < 18 < 10 < 19 <7 < 12 <7 <7 < 36 <8 07/25/11 <9 <9 < 23 < 11 < 20 <9 < 17 <8 <8 < 54 <15 I-~ 08109111 <6 <5 < 16 <7 < 14 <5 < 11 <6 <6 < 26 <8 08/23/11 <8 <7 < 20 < 11 < 20 <7 < 15 <7 <7 < 32 <11 09/06/11 <5 <5 <12 <6 <11 <5 <9 <5 <5 < 24 <6 09/20/11 <7 <7 < 13 <8 < 16 <6 < 15 <5 <6 < 31 < 12 10/04/11 <7 <6 < 17 <8 < 15 <8 < 11 <7 <6 < 31 <8 10/18/11 <7 <8 < 20 <8 < 21 <8 < 12 <6 <7

36 <10 11/01/11 <6 <6 <11 <7 < 13 <6 < 10 <5 <5 < 27 <7 12/06/11 <5 <6 <12 <6

14 <5 <10 <4 <6 < 31 <9 MEAN Oc 0

I'-

0 0

TABLE C-VIII.1 CONCENTRATIONS OF GAMMA EMITTERS IN VEGETATION SAMPLES COLLECTED INTHE VICINITY OF BYRON NUCLEAR GENERATING STATION, 2011 RESULTS IN UNITS OF PCI/KG WET +/- 2 SIGMA 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 SITENRO PERIOD BY-CONTROL Carrots/beets/onions (comp) 08/29/11 < 23 < 25 < 72 < 35 < 47 < 21 < 37 < 50 < 19 < 23 < 125 < 41 Lettuce 08/29/11 < 23 < 26 < 48 < 25 < 57 < 27 < 40 < 48 < 21 < 25 < 146 < 47 MEAN BY-QUAD 1 Beet greens 08/29/11 < 31 < 31 < 56 < 36 < 56 < 29 < 49 < 57 < 26 < 26 < 149 < 29 Beets 08/29/11 < 22 < 16 < 60 < 26 < 33 < 21 < 36 < 43 < 17 < 24 < 84 < 43 MEAN - - - - - - - - - - - -

BY-QUAD 2 Kohlrabi leaves 08/29/11 < 27 < 26 < 66 < 30 < 63 < 32 < 50 < 57 < 25 < 29 < 162 < 31 Kohlrabi/potatoes (comp) 08/29/11 < 20 < 20 < 47 < 25 < 49 < 18 < 38 < 48 < 16 < 21 < 100 < 22 cm MEAN BY-QUAD 3 Potatoes/garlic (comp) 08/29/11 < 15 < 12 < 35 < 23 < 46 < 20 < 30 < 33 < 14 < 21 < 74 < 18 Rhubarb leaves 08/29/11 < 13 < 12 < 29 < 15 < 27 < 13 < 22 < 28 < 11 < 13 < 69 < 22 MEAN BY-QUAD 4 Beet greens 08/29/11 < 13 < 13 < 30 < 16 <29 < 14 < 23 < 27 < 11 < 13 < 77 < 23 Beets 08/29/11 < 21 < 24 < 36 < 31 < 62 < 24 < 46 < 48 < 23 < 24 < 146 < 43 Parsley 08/29/11 <28 < 26 < 78 < 34 < 71 <26 < 46 < 58 < 26 < 28 < 150 < 43 MEAN 0

TABLE C-IX.1 QUARTERLY TLD RESULTS FOR BYRON NUCLEAR GENERATING STATION, 2011 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 21.0 + 7.1 23 (I) 18 (1) 25 18 BY-01-2 21.8 + 9.1 24 (I) 19 (1) 27 17 BY-04-1 25.0 + 7.3 27 (I) 21 (1) 29 23 BY-04-2 25.0 + 6.3 26 (i) 22 (1) 29 23 BY-06-1 21.8 + 5.0 22 (i) 19 (1) 25 21 BY-06-2 22.5 + 11.6 24 (I) 19 (1) 30 17 BY-08-1 23.5 + 10.4 26 (I) 22 (1) 29 17 BY-08-2 22.3 + 9.1 23 (I ) 23 (1) 27 16 BY-21-1 21.5 + 8.4 24 (I) 19 (1) 26 17 BY-21-2 21.0 + 8.5 23 (I) 18 (1) 26 17 BY-22-1 27.3 +/- 4.1 29 (i) 26 (1) 29 25 BY-22-2 27.0 +/- 7.7 30 (I) 26 (1) 30 22 BY-23-1 26.3 +/- 8.9 29 (I) 23 (1) 31 22 BY-23-2 26.5 +/- 8.1 29 (1) 26 (1) 30 21 BY-24-1 25.3 +/- 5.5 27 (i) 22 (1) 28 24 BY-24-2 24.5 +/- 8.1 25 (I) 22 (1) 30 21 BY-101-1 21.8 +/- 9.7 23 (I) 19 (1) 28 17 BY-101-2 20.8 +/- 10.0 24 (i) 17 (i) 26 16 BY-102-1 27.5 +/- 5.3 28 (I) 25 (1) 31 26 BY-1 02-2 26.8 +/- 7.0 28 (I) 25 (1) 31 23 BY-103-1 26.3 +/- 10.6 28 (I ) 22 (1) 33 22 BY-103-2 26.0 +/- 8.5 28 (I) 23 (1) 31 22 BY-1 03-3 25.0 +/- 4.3 25 (I) 24 (1) 28 23 BY-104-1 25.8 +/- 6.4 28 (i) 23 (1) 29 23 BY- 104-2 26.3 +/- 7.7 29 (I ) 24 (1) 30 22 BY-1 04-3 25.0 +/- 7.1 27 (I) 22 (1) 29 22 BY-105-1 27.3 +/- 7.2 29 (i) 28 (1) 30 22

"-BY-105-2 26.8 +/- 8.5 28 (I) 25 (1) 32 22

,BY-106-1 25.5 + 7.4 27 (I) 23 (1) 30 22 BY- 106-2 26.0 + 8.5 29 (I) 24 (1) 30 21 BY-107-1 28.5 +/- 6.0 30 (I) 26 (1) 32 26 BY- 107-2 28.3 +/- 6.4 31 (I) 26 (1) 31 25 BY-1 07-3 24.0 +/- 8.5 26 (I) 21 (1) 29 20 BY-108-1 27.8 +/- 8.7 30 (I) 27 (1) 32 22 BY- 108-2 26.0 +/- 11.9 27 (I ) 22 (1) 34 21 BY-109-1 24.8 +/- 6.2 25 (I) 23 (1) 29 22 BY-1 09-2 26.5 +/- 6.6 29 (I) 22 (1) 29 26 BY-110-1 24.5 +/- 5.8 27 (1) 22 (1) 27 22 BY-110-2 25.3 +/- 8.9 28 (I) 22 (1) 30 21 BY-111-3 26.5 +/- 6.2 28 (I) 25 (1) 30 23 BY-111-4 25.0 +/- 9.5 28 (I) 22 (1) 30 20 BY-1 12-3 27.0 +/- 9.4 30 (1) 23 (1) 32 23 BY-1 12-4 25.5 +/- 7.4 28 (I ) 24 (1) 29 21 BY-1 13-1 25.8 +/- 7.0 27 (i) 24 (1) 30 22 BY-113-2 23.0 +/- 9.8 25 (I) 19 (1) 29 19 (1) SEE PROGRAM EXCEPTIONS SECTION FOR FURTHER EXPLANATION C-18 70 of 200

TABLE C-IX.1 QUARTERLY TLD RESULTS FOR BYRON NUCLEAR GENERATING STATION, 2011 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 14-1 24.5 +/- 11.0 27 (1) 21 (1) 31 19 BY-1 14-2 25.0 +/- 7.8 26 (1) 23 (1) 30 21 BY-115-1 25.3 +/- 7.9 27 (1) 22 (1) 30 22 BY-1 15-2 22.8 +/- 7.7 25 (1) 20 (1) 27 19 BY-116-1 23.0 +/- 8.5 25 (1) 20 (1) 28 19 BY-1 16-2 23.0 +/- 7.7 24 (1) 20 (1) 28 20 BY-1 16-3 24.0 +/- 9.4 28 (1) 21 (1) 28 19 BY-201-3 24.0 +/- 8.5 27 (1) 22 (1) 28 19 BY-201-4 25.8 +/- 7.5 29 (1*) 22 (1) 29 23 BY-202-1 25.3 +/- 6.6 27 (1) 22 (1) 29 23 BY-202-2 27.8 +/- 6.6 31 (1) 24 (1) 30 26 BY-203-1 22.0 +/- 9.9 24 (1) 19 (1) 28 17 BY-203-2 24.0 +/- 8.5 26 (1) 21 (1) 29 20 BY-204-1 22.8 +/- 9.0 23 (1) 20 (1) 29 19 BY-204-2 27.0 +/- 6.7 28 (1) 23 (1) 31 26 BY-205-1 27.3 +/- 8.2 30 (1) 26 (1) 31 22 BY-205-2 24.3 +/- 5.0 25 (1) 24 (1) 27 21 BY-206-1 28.0 +/- 4.3 28 (1) 27 (1) 31 26 BY-206-2 26.3 +/- 8.1 26 (1) 23 (1) 32 24 BY-207-1 27.0 +/- 8.5 29 (1) 24 (1) 32 23 BY-207-2 25.3 +/- 5.5 27 (1) 24 (1) 28 22 BY-208-1 28.5 +/- 5.3 29 (1) 26 (1) 32 27 BY-208-2 25.3 +/- 5.7 27 (1) 26 (1) 27 21 BY-209-1 25.8 +/- 5.5 27 (1) 24 (1) 29 23 BY-209-4 27.3 +/- 6.6 29 (1) 24 (1) 31 25 BY-210-3 25.8 +/- 9.0 28 (1) 22 (1) 31 22 BY-210-4 26.5 +/- 2.6 27 (1) 25 (1) 28 26 BY-21 1-1 27.3 +/- 5.3 29 (1) 25 (1) 30 25 BY-211-4 25.8 +/- 7.7 28 (1) 22 (1) 30 23 BY-212-1 26.8 +/- 6.6 29 (1) 25 (1) 30 23 BY-212-4 27.3 +/- 7.7 31 (1) 25 (1) 30 23 BY-213-1 26.5 +/- 7.0 29 (1) 24 (1) 30 23 BY-213-4 27.0 +/- 7.3 29 (1) 25 (1) 31 23 BY-214-1 25.3 +/- 7.7 28 (1) 23 (1) 29 21 BY-214-4 27.0 +/- 7.1 29 (1) 24 (1) 31 24 BY-215-1 26.8 +/- 7.7 27 (1) 23 (1) 32 25 BY-215-4 27.3 +/- 7.7 31 (1) 25 (1) 30 23 BY-216-1 28.3 +/- 6.8 28 (1) 25 (1) 33 27 BY-216-2 26.3 +/- 7.2 27 (1) 23 (1) 31 24 BY-301 -1 19.8 +/- 6.2 20 (1) 18 (1) 24 17 BY-302-1 26.0 +/- 5.9 29 (1) 23 (1) 28 24 BY-309-1 25.0 +/- 6.7 27 (1) 26 (1) 27 20 BY-309-2 24.8 +/- 7.0 26 (1) 23 (1) 29 21 BY-309-3 24.3 +/- 9.3 26 (1) 21 (1) 30 20 BY-309-4 22.0 +/- 7.1 22 (1) 20 (1) 27 19 BY-314-1 22.0 +/- 9.5 25 (1) 19 (1) 27 17 (1) SEE PROGRAM EXCEPTIONS SECTION FOR FURTHER EXPLANATION C-19 71 of 200

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, 2011 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 27.3 +/- 3.8 27.9 +/- 3.7 25.0 +/- 6.1 25.9 +/- 5.3 24.5 +/- 4.2 APR-JUN 22.8 +/- 4.7 23.7 +/- 3.6 21.4 +/- 5.5 21.4 +/- 5.9 22.5 +/- 1.4 JUL-SEP 29.8 +/- 3.5 30.0 +/- 3.1 27.4 +/- 3.8 28.2 +/- 4.1 28.0 +/- 2.8 OCT-DEC 21.5 +/- 4.5 23.1 +/- 4.7 19.7 +/- 4.9 20.6 +/- 5.7 16.5 +/- 1.4 TABLE C-IX.3

SUMMARY

OF THE AMBIENT DOSIMETRY PROGRAM FOR BYRON NUCLEAR GENERATING STATION, 2011 RESULTS IN UNITS OF MILLI-ROENTGEN/QUARTER LOCATION SAMPLES PERIOD PERIOD PERIOD MEAN ANALYZED MINIMUM MAXIMUM +/-2 S.D.

INNER RING 144 16 34 25.3 + 7.9 OUTER RING 128 17 33 26.1 +/- 6.9 SPECIAL INTEREST 28 17 30 23.4 +/- 7.8 OTHER 56 17 31 24.0 +/- 8.2 CONTROL 8 16 29 22.9 +/- 9.2 INNER RING STATIONS - BY-101-1, BY-101-2, BY-102-1, BY-102-2, BY-103-1, BY-103-2, BY-103-3, BY-104-1, BY-104-2, BY-104-3, BY-105-1, BY-105-2, BY-106-1, BY-106-2, BY-107-1, BY-107-2, BY-107-3, BY-108-1, BY-108-2, BY-109-1, BY-109-2, BY-110-1, BY-110-2, BY-111-3, BY-111-4, BY-112-3, BY-112-4, BY-113-1, BY-113-2, BY-114-1, BY-114-2, BY-115-1, BY-115-2, BY-116-1, BY-116-2, BY-116-3 OUTER RING STATIONS - BY-201-3, BY-201-4, BY-202-1, BY-202-2, BY-203-1, BY-203-2, BY-204-1, BY-204-2, BY-205-1, BY-205-2, BY-206-1, BY-206-2, BY-207-1, BY-207-2, BY-208-1, BY-208-2, BY-209-1, BY-209-4, BY-210-3, BY-210-4, BY-211-1, BY-211-4, BY-212-1, BY-212-4, BY-213-1, BY-213-4, BY-214-1, BY-214-4, BY-215-1, BY-215-4, BY-216-1, BY-216-2 SPECIAL INTEREST STATIONS - BY-301-1, BY-302-1, BY-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 200

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

Collected in the Vicinity of BNGS, 2000 - 2011 BY-12 Oregon Pool of Rock River, Downstream 10.0 8.0 6.0

,-J 0.

4.0 2.0 0.0I I I I 01-25-00 01-20-02 01-16-04 01-11-06 01-07-08 01-02-10 12-29-11 BY-29 (C) Byron, Rock River Upstream 10.0 8.0 6.0 0.

4.0 2.0 0.0I I I I I 01-25-00 01-20-02 01-16-04 01-11-06 01-07-08 01-02-10 12-29-11 DUE TO VENDOR CHANGE IN 2005, < VALUES ARE LLD VALUES JANUARY THROUGH JUNE 2005 AND MDC VALUES AFTER JUNE 2005 C-21 73 of 200

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

Collected in the Vicinity of BNGS, 2000 - 2011 BY-12 Oregon Pool of Rock River, Downstream 4500 4000 3500 3000 2500 C-2000 1500 1000 500 0

03-28-00 03-14-02 02-28-04 02-13-06 01-30-08 01-15-10 01-01-12 BY-29 (C) Byron, Rock River Upstream 250 200 150

,-J C.)

100 50 0 4-03-28-00 03-14-02 02-28-04 02-13-06 01-30-08 01-15-10 01-01-12 DUE TO VENDOR CHANGE IN 2005, < VALUES ARE LLD VALUES JANUARY THROUGH JUNE 2005 AND MDC VALUES AFTER JUNE 2005 C-22 74 of 200

FIGURE C-3 Ground Water - Tritium - Stations BY-14-1 and BY-18 Collected in the Vicinity of BNGS, 2000 - 2011 BY-14-1 3200 N. German Church Road Well 250 200 150

-h 100 50 0 I I 01-04-00 01-03-02 01-03-04 01-02-06 01-02-08 01-01-10 01-01-12 BY-18 McCoy Farmstead Well 250 200

,-J 150 C. 100 50 0 4I 01-04-00 01-03-02 01-03-04 01-02-06 01-02-08 01-01-10 01-01-12 DUE TO VENDOR CHANGE IN 2005, < VALUES ARE LLD VALUES JANUARY THROUGH JUNE 2005 AND MDC VALUES AFTER JUNE 2005 C-23 75 of 200

FIGURE C-4 Ground Water - Tritium - Stations BY-18-1 Collected in the Vicinity of BNGS, 2010 - 2011 BY-18-1 Calhoun Well 250 T 200 150 C.,

100 50 TL 07-01-10 10-06-10 01-11-11 04-18-11 07-24-11 10-29-11 C-24 76 of 200

FIGURE C-5 Ground Water - Tritium - Station BY-32 Collected in the Vicinity of BNGS, 2000 - 2011 BY-32 Wolford Well 250 200 150

-J C.)

100 50 0o I , I I I I 01/04/00 12/23/01 12/12/03 11/30/05 11/19/07 11/07/09 10/27/11 DUE TO VENDOR CHANGE IN 2005, < VALUES ARE LLD VALUES JANUARY THROUGH JUNE 2005 AND MDC VALUES AFTER JUNE 2005 C-25 77 of 200

FIGURE C-6 Ground Water - Tritium - Stations BY-35 and BY-36 Collected in the Vicinity of BNGS, 2006 - 2011 BY-35 Vancko Well 250 200

.J 150 C.

100 50 0 i 04-11-06 05-21-07 06-29-08 08-08-09 09-17-10 10-27-11 BY-36 Blanchard Well 250 200 150 C.)

100 50 0

04-1 1-06 05-21-07 06-29-08 08-08-09 09-17-10 10-27-11 C-26 78 of 200

FIGURE C-7 Ground Water - Tritium - Stations BY-37 Collected in the Vicinity of BNGS, 2006 - 2011 BY-37 Alexander Well 250 T 200 +

150 L-C.

100 +

50 +

0 4-04-11-06 05-21-07 06-29-08 08-08-09 09-17-10 10-27-11 C-27 79 of 200

FIGURE C-8 Air Particulates - Gross Beta - Stations BY-08 (C) and BY-21 Collected in the Vicinity of BNGS, 2000 - 2011 BY-08 (C) Leaf River WNW 60.0 50.0 e~40.0 E

30.0 9

o 20.0 10.0 0.0 01-04-00 01-03-02 01-03-04 01-02-06 01-02-08 01-01-10 01-01-12 BY-21 Byron Nearsite N 60.0 50.0 40.0 c*

0. 30.0 ULJ 0 20.0 10.0 0.0 01-04-00 01-03-02 01-03-04 01-02-06 01-02-08 01-01-10 01-01-12 C-28 80 of 200

FIGURE C-9 Air Particulates - Gross Beta - Stations BY-22 and BY-23 Collected in the Vicinity of BNGS, 2000 - 2011 BY-22 Byron Nearsite SE 60.0 50.0 t)40.0 E

CL 30.0 o 20.0 10.0 0.0 01-04-00 01-03-02 01-03-04 01-02-06 01-02-08 01-01-10 01-01-12 BY-23 Byron Nearsite S 60.0 50.0 40.0 4-CL 30.0 LU.

0 20.0 10.0 0.0 01-04-00 01-03-02 01-03-04 01-02-06 01-02-08 01-01-10 01-01-12 C-29 81 of 200

FIGURE C-10 Air Particulates - Gross Beta - Station BY-24 Collected in the Vicinity of BNGS, 2000 - 2011 BY-24 Byron Nearsite SW 70.0 60.0 50.0 40.0 0.

CL 30.0 uJ 0

20.0 10.0 0.0 I i t i 1 01-04-00 01-03-02 01-03-04 01-02-06 01-02-08 01-01-10 01-01-12 C-30 82 of 200

FIGURE C-1I Air Particulates - Gross Beta - Stations BY-01 and BY-04 Collected in the Vicinity of BNGS, 2005 - 2011 BY-01 Byron N 60.0 50.0 c~40.0-Q CL 30.0 9

w 20.0 10.0 0.0 ' i i i i 07-05-05 08-04-06 09-03-07 10-02-08 11-01-09 12-01-10 12-31-11 BY-04 Paynes Point SE 60.0 50.0 40.0 C4)

L-9 o 30.0 o20.0 10.0 0.0 I I 07-05-05 08-04-06 09-03-07 10-02-08 11-01-09 12-01-10 12-31-11 Regular analysis of far field air particulate & gross beta did not take place prior to 2005.

C-31 83 of 200

FIGURE C-12 Air Particulates - Gross Beta - Station BY-06 Collected in the Vicinity of BNGS, 2005 - 2011 BY-06 Oregon SSW 60.0 50.0 c* 40.0 E

c 30.0 Lkl o 20.0 10.0 0.0 I I I I I I 07-05-05 08-04-06 09-03-07 10-02-08 11-01-09 12-01-10 12-31-11 Regular analysis of far field air particulate & gross beta did not take place prior to 2005.

C-32 84 of 200

APPENDIX D INTER-LABORATORY COMPARISON PROGRAM 85 of 200

86 of 200 TABLE D-1 ANALYTICS ENVIRONMENTAL RADIOACTIVITY CROSS CHECK PROGRAM TELEDYNE BROWN ENGINEERING, 2011 (PAGE 1 OF 3)

Identification Reported Known Ratio (c)

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

March 2011 E7460-396 Milk Sr-89 pCi/L 98.8 97.4 1.01 A Sr-90 pCi/L 15.2 15.8 0.96 A E7461-396 Milk 1-131 pCi/L 92.9 96.9 0.96 A Ce-141 pCi/L not provided by Analytics for this study Cr-51 pCi/L 398 298 1.34 N (1)

Cs-134 pCi/L 130 130 1.00 A Cs-137 pCi/L 232 205 1.13 A Co-58 pCi/L 121 113 1.07 A Mn-54 pCi/L 289 266 1.09 A Fe-59 pCi/L 201 175 1.15 A Zn-65 pCi/L 287 261 1.10 A Co-60 pCi/L 186 172 1.08 A E7463-396 AP Ce-141 pCi not provided by Analytics for this study Cr-51 pCi 243 215 1.13 A Cs-1 34 pCi 85.0 94.2 0.90 A Cs-1 37 pCi 168 148 1.14 A Co-58 pCi 89.2 81.8 1.09 A Mn-54 pCi 171 192 0.89 A Fe-59 pCi 129 126 1.02 A Zn-65 pCi 159 189 0.84 A Co-60 pCi 132 124 1.06 A E7462-396 Charcoal 1-131 pCi 96.5 96.3 1.00 A June 2011 E7851-396 Milk Sr-89 pCi/L 96.7 103 0.94 A Sr-90 pCi/L 13.8 15.6 0.88 A E7852-396 Milk 1-131 pCi/L 110 103.0 1.07 A Ce-141 pCi/L 68.1 79.9 0.85 A Cr-51 pCi/L 186 206 0.90 A Cs-134 pCi/L 164 190 0.86 A Cs-137 pCi/L 140 138 1.01 A Co-58 pCi/L 141 152 0.93 A Mn-54 pCi/L 136 138 0.99 A Fe-59 pCi/L 128 123 1.04 A Zn-65 pCi/L 263 261 1.01 A Co-60 pCi/L 189 195 0.97 A E7854-396 AP Ce-141 pCi 49.9 42.9 1.16 A Cr-51 pCi 95.6 110 0.87 A Cs-134 pCi 104 102 1.02 A Cs-137 pCi 83.8 74.0 1.13 A Co-58 pCi 90.7 81.3 1.12 A Mn-54 pCi 74.5 73.9 1.01 A Fe-59 pCi 62.0 66.1 0.94 A Zn-65 pCi 140 140 1.00 A Co-60 pCi 119 104 1.14 A E7853-396 Charcoal 1-131 pCi 76.2 86.1 0.89 A D-1 87 of 200

TABLE D-1 ANALYTICS ENVIRONMENTAL RADIOACTIVITY CROSS CHECK PROGRAM TELEDYNE BROWN ENGINEERING, 2011 (PAGE 2 OF 3)

Identification Reported Known Ratio (c)

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

September 2011 E8070-396 Milk Sr-89 pCi/L 102 90.8 1.12 Sr-90 pCi/L 13.2 14.7 0.90 E8071-396 Milk 1-131 pCi/L 74.2 89.2 0.83 Ce-141 pCi/L 66.9 66.7 1.00 Cr-51 pCi/L 249 226 1.10 Cs-134 pCi/L 116 128 0.91 Cs- 137 pCi/L 106 114 0.93 Co-58 pCi/L 95.4 97.5 0.98 Mn-54 pCi/L 147 151 0.97 Fe-59 pCi/L 53.1 54.8 0.97 Zn-65 pCi/L 175 180 0.97 Co-60 pCi/L 150 157 0.96 E8073-396 AP Ce-141 pCi 66.6 67.5 0.99 Cr-51 pCi 263 229 1.15 Cs-1 34 pCi 139 130 1.07 Cs-137 pCi 110 115 0.96 Co-58 pCi 108 98.6 1.10 Mn-54 pCi 152 153 0.99 Fe-59 pCi 57.5 55.5 1.04 Zn-65 pCi 190 183 1.04 Co-60 pCi 156 159 0.98 E8072-396 Charcoal 1-131 pCi 77.6 80.6 0.96 A December, 2011 E8230-396 Milk Sr-89 pCi/L 93.3 93.1 1.00 A Sr-90 pCi/L 12.7 15.4 0.82 A E8231-396 Milk 1-131 pCi/L 82.5 90.2 0.91 A Ce-141 pCi/L not provided by Analytics for this study Cr-51 pCi/L 465 566 0.82 A Cs-134 pCi/L 142 171 0.83 A Cs-137 pCi/L 185 210 0.88 A Co-58 pCi/L 177 221 0.80 A Mn-54 pCi/L 208 241 0.86 A Fe-59 pCi/L 164 183 0.90 A Zn-65 pCi/L 259 291 0.89 A Co-60 pCi/L 224 270 0.83 A E8233-396 AP Ce-141 pCi not provided by Analytics for this study Cr-51 pCi 344 368 0.93 A Cs-134 pCi 105 ill 0.95 A Cs-137 pCi 129 137 0.94 A Co-58 pCi 145 144 1.01 A Mn-54 pCi 137 157 0.87 A Fe-59 pCi 119 119 1.00 A Zn-65 pCi 145 190 0.76 W Co-60 pCi 168 176 0.95 A D-2 88 of 200

TABLE D-1 ANALYTICS ENVIRONMENTAL RADIOACTIVITY CROSS CHECK PROGRAM TELEDYNE BROWN ENGINEERING, 2011 (PAGE 3 OF 3)

Identification Reported Known Ratio (c)

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

December 2011 E8232-396 Charcoal 1-131 pCi 100 89.5 1.12 A (1) Sample appears to be biased high. CorrectiveAction evaluatedafter the 2nd QuarterAnalytics PE sample; no action required. NCR 11-13 (a) Teledyne Brown Engineeringreported result.

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

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

(d) Analytics evaluation basedon TBE internalQC 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 89 of 200

TABLE D-2 ERA ENVIRONMENTAL RADIOACTIVITY CROSS CHECK PROGRAM TELEDYNE BROWN ENGINEERING, 2011 (PAGE 1 OF 1)

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

May 2011 RAD-85 Water Sr-89 pCi/L 59.8 63.2 51.1 -71.2 A Sr-90 pCi/L 42.5 42.5 31.3 -48.8 A Ba-133 pCi/L 73.3 75.3 63.0 - 82.8 A Cs-134 pCi/L 64.9 72.9 59.5 - 80.2 A Cs-1 37 pCi/L 74.6 77.0 69.3 - 87.4 A Co-60 pCi/L 87.8 88.8 79.9 - 100 A Zn-65 pCi/L 103 98.9 89.0- 118 A Gr-A pCi/L 64.1 50.1 26.1 - 62.9 N (1)

Gr-B pCi/L 51.8 49.8 33.8 - 56.9 A 1-131 pCi/L 27.4 27.5 22.9 - 32.3 A U-Nat pCi/L 38.5 39.8 32.2 - 44.4 A H-3 pCi/L 10057 10200 8870-11200 A MRAD-14 Filter Gr-A pCi/filter 79.7 74.3 38.5-1.12 A November 2011 RAD-87 Water Sr-89 pCi/L 81.0 69.7 56.9 - 77.9 N (2)

Sr-90 pCi/L 35.5 41.4 30.2 - 47.2 A Ba-133 pCi/L 90.7 96.9 81.8- 106 A Cs-1 34 pCi/L 36.6 33.4 26.3 - 36.7 A Cs-1 37 pCi/L 44.7 44.3 39.4-51.7 A Co-60 pCi/L 118.7 119 107- 133 A Zn-65 pCi/L 80.2 76.8 68.9 - 92.5 A Gr-A pCi/L 34.2 53.2 27.8 - 66.6 A Gr-B pCi/L 39.3 45.9 30.9-53.1 A 1-131 pCi/L 22.9 27.5 22.9 - 32.3 A U-Nat pCi/L 46.8 48.6 39.4 - 54.0 A H-3 pCi/L 15733 17400 15200 - 19100 A MRAD-1 5 Filter Gr-A pCi/filter 44.6 58.4 30.3 - 87.8 A (1) The solids on the planchet exceeded 100 mg, which was beyond the range of the efficiency curve. NCR 11-08 (2) Sr-89 TBE to known ratio of 1.16 fell within acceptable range of+/- 20%. No action required. NCR 11-16 (a) Teledyne Brown Engineeringreported result.

(b) The ERA known value is equal to 100% of the parameterpresent in the standardas determinedby gravimetricand/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 90 of 200

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

TELEDYNE BROWN ENGINEERING, 2011 (PAGE 1 OF 2)

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

March 2011 11-MaW24 Water Cs-1 34 Bq/L 19.1 21.5 15.1 -28.0 A Cs-1 37 Bq/L 29.0 29.4 20.6 - 38.2 A Co-57 Bq/L 0.139 (1) A Co-60 Bq/L 23.9 24.6 17.2-32.0 A H-3 Bq/L 265 243 170-316 A Mn-54 Bq/L 31.8 31.6 22.1 -41.1 A K-40 Bq/L 94.8 91 64 - 118 A Sr-90 Bq/L 9.64 8.72 6.10-11.34 A Zn-65 Bq/L -0.142 (1) A 11-GrW24 Water Gr-A Bq/L 0.767 1.136 0.341 - 1.931 A Gr-B Bq/L 3.43 2.96 1.48 - 4.44 A 11-MaS24 Soil Cs-134 Bq/kg 612 680 476 - 884 A Cs-137 Bq/kg 772 758 531 - 985 A Co-57 Bq/kg 910 927 649- 1205 A Co-60 Bq/kg 500 482 337 - 627 A Mn-54 Bq/kg 0.607 (1) A K-40 Bq/kg 569 540 378 - 702 A Sr-90 Bq/kg NR 160 112- 208 N (2)

Zn-65 Bq/kg 1497 1359 951 -1767 A 11 -Rd F24 AP Cs-134 Bq/sample 3.26 3.49 2.44 -4.54 A Cs-137 Bq/sample 2.36 2.28 1.60-2.96 A Co-57 Bq/sample 3.30 3.33 2.33 -4.33 A Co-60 Bq/sample 0.0765 (1) A Mn-54 Bq/sample 2.84 2.64 1.85 - 3.43 A Sr-90 Bq/sample NR 1.36 0.95- 1.77 N (2)

Zn-65 Bq/sample 3.30 3.18 2.23-4.13 A 11-GrF24 AP Gr-A Bq/sample 0.101 0.659 0.198- 1.120 N (3)

Gr-B Bq/sample 1.23 1.323 0.662 - 1.985 A 11-RdV24 Vegetation Cs-1 34 Bq/sample 4.97 5.50 3.85- 7.15 A Cs-137 Bq/sample 0.0356 (1) A Co-57 Bq/sample 10.8 9.94 6.96- 12.92 A Co-60 Bq/sample 4.89 4.91 3.44 - 6.38 A Mn-54 Bq/sample 6.42 6.40 4.48 - 8.32 A Sr-90 Bq/sample NR 2.46 1.72 -3.20 N (2)

Zn-65 Bq/sample 3.07 2.99 2.09 - 3.89 A September 2011 11-MaW25 Water Cs-134 Bq/L 16.0 19.1 13.4-24.8 A Cs-1 37 Bq/L 0.0043 (1) A Co-57 Bq/L 33.1 36.6 25.6-47.6 A Co-60 Bq/L 26.9 29.3 20.5 - 38.1 A H-3 Bq/L 1011 1014 710- 1318 A Mn-54 Bq/L 23.2 25.0 17.5-32.5 A K-40 Bq/L 147 156 109 - 203 A Sr-90 Bq/L 15.8 14.2 9.9 - 18.5 A Zn-65 Bq/L 27.3 28.5 20.0 - 37.1 A D-5 91 of 200

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

TELEDYNE BROWN ENGINEERING, 2011 (PAGE 2 OF 2)

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

September 2011 11-GrW25 Water Gr-A Bq/L 0.894 0.866 0.260 - 1.472 A Gr-B Bq/L 5.87 4.81 2.41 - 7.22 A 11-MaS25 Soil Cs-1 34 Bq/kg -0.213 (1) A Cs-137 Bq/kg 1110 979 685-1273 A Co-57 Bq/kg 1290 1180 826-1534 A Co-60 Bq/kg 731 644 451 -837 A Mn-54 Bq/kg 987 848 594-1102 A K-40 Bq/kg 753 625 438-813 W Sr-90 Bq/kg 276 320 224-416 A Zn-65 Bq/kg 1870 1560 1092-2028 A September 2011 11-RdF25 AP Cs-134 Bq/sample -0.043 (1) A Cs-137 Bq/sample 3.09 2.60 1.82 - 3.38 A Co-57 Bq/sample 5.36 5.09 3.56 - 6.62 A Co-60 Bq/sample 3.41 3.20 2.24-4.16 A Mn-54 Bq/sample 0.067 (1) A Sr-90 Bq/sample 1.84 1.67 1.17-2.17 A Zn-65 Bq/sample 5.17 4.11 2.88 - 5.34 W 11-GrF25 AP Gr-A Bq/sample 0.0058 (1) A Gr-B Bq/sample -0.01 (1) A 11-RdV25 Vegetation Cs-134 Bq/sample 0.0081 (1) A Cs-137 Bq/sample 4.94 4.71 3.30 -6.12 A Co-57 Bq/sample 0.0639 (1) A Co-60 Bq/sample 3.36 3.38 2.37 - 4.39 A Mn-54 Bq/sample 5.89 5.71 4.00 - 7.42 A Sr-90 Bq/sample 1.31 1.26 0.88-1.64 A Zn-65 Bq/sample 6.54 6.39 4.47 - 8.31 A (1) False positive test.

(2) Evaluated as failed due to not reporting a previously reportedanalyte. NCR 11-11 (3) The filter for Gross Alpha was counted on the wrong side. Recounted on the correct side resulted in acceptable results. NCR 11-11 (a) Teledyne Brown Engineering reportedresult.

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

(c) DOEIMAPEPevaluation: A=acceptable, W=acceptablewith warning, N=not acceptable.

D-6 92 of 200

APPENDIX E EFFLUENT REPORT 93 of 200

94 of 200 TABLE OF CONTENTS SUM MARY ........................................................................................................................... 1 INTRO DUCTIO N ................................................................................................................. 2 1.0. EFFLUENTS ................................................................................................ 3 1.1. G aseous Effluents to the Atm osphere ............................................ 3 1.2. Liquids Released to Rock River ........................................................ 3 2.0. SO LID RA DIO ACTIVE W ASTE ................................................................... 4 3.0. DO SE TO MAN ............................................................................................ 4 3.1. G aseous Effluent Pathways ............................................................. 4 3.1.1. Noble G ases ........................................................................ 4 3.1.1.1. G am m a Dose Rates .............................................. 4 3.1.1.2. Beta Air and Skin Dose Rate ................................ 4 3.1.2. Radioactive Iodine & Particulate ........................................ 5 3.1.3. G aseous Total Dose ........................................................... 6 3.2. Liquid Effluent Pathways ................................................................... 6 3.3. Total Dose ......................................................................................... 6 3.4. Assessm ent of Dose to Mem ber of Public ......................................... 6 4.0. SITE METEO RO LO GY ................................................................................ 7 95 of 200

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 Liquid Effluents ......................................................................... 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 96 of 200

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 2.62E-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 40CFR1 90.

There were no additional operational controls implemented which affected the areas of radiological effluents in 2011.

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.

97 of 200

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 2011 gaseous dose was vegetation. The critical pathway for 2011 liquid dose was freshwater fish.

98 of 200

1.0 EFFLUENTS 1.1 Gaseous Effluents to the Atmosphere Measured concentrations and isotopic composition of noble gases, radioiodine, tritium and particulate radioactivity released to the atmosphere during the year are listed in Table 1.1-1.

A total of 1.40E+00 curies of fission and activation gases were released with a maximum average quarterly release rate of 1.36E-01 pCi/sec.

A total of 7.47E-05 curies of 1-131 were released during the year with a maximum average quarterly release rate of 5.36E-06 pCi/sec.

A total of 1.37E-06 curies were released as airborne particulate matter with a maximum average quarterly release rate of 1.32E-07 pCi/sec.

A total of 8.23E+00 curies of other (C-14, Br-82) radioisotopes were released with a maximum average quarterly release rate of 2.86E-01 pCi/sec.

A total of 5.95E+01 curies of tritium were released with a maximum average quarterly release rate of 2.51 E+00 pCi/sec.

Gross alpha-emitting radionuclides were below detectable limits.

1.2 Liquids Released to Rock River A total of 2.66E+10 liters of radioactive liquid wastes containing 2.52E-02 curies of fission and activation products were discharged with a maximum quarterly average concentration of 2.46E-09 pCi/ml.

A total of 2.58E+03 curies of tritium were discharged with a maximum quarterly average concentration of 4.26E-04 uCi/ml.

A total of 1.23E-03 curies of dissolved and entrained gases were discharged with a maximum quarterly average concentration of 2.90E-10 uCi/ml.

Gross alpha-emitting radionuclides were below detectable limits.

99 of 200

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

2.0 SOLID RADIOACTIVE WASTE Solid radioactive wastes were shipped by truck. For detail, refer to Byron Station 2011 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 5.02E-05 mrad based on measured effluents and average meteorological data, and 8.68E-06 mrad based on measured effluents and concurrent meteorological data.

(Table 3.4-1).

3.1.1.2 Beta Air and Skin Dose Rates The range of beta particles in air is relatively small (on the order of a few meters or less);

consequently, plumes of gaseous effluents may be considered "semi-infinite" for purpose of calculating the dose from beta radiation incident on the skin. However, the actual dose to sensitive skin tissues is difficult to calculate due to the effect of the beta particle energies, thickness of inert skin and clothing covering sensitive tissues. For purposes of this report the skin is taken to have a 100 of 200

thickness of 7.0 mg/cm2 and an occupancy factor of 1.0 is used. The skin dose based on measured effluents and concurrent meteorological data for the year was 1.23E-05 mrem.

The maximum offsite beta air dose for the year based on measured effluents and average meteorological data was 2.25E-05 mrad. The beta air dose based on measured effluents and concurrent meteorological data was 1.60E-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 6.71E-01 mrem (child/bone) based on measured effluents and average meteorological data and 6.11E-01 mrem based on measured effluents and concurrent meteorological data.

The maximum dose from radioactive iodine and particulate (including C-14) to the whole body was 1.37E-01 mrem (child) based on measured effluents and average meteorological data and 1.26E-01 mrem based on measured effluents and concurrent meteorological data.

101 of 200

3.1.3 Gaseous Total Dose The maximum total dose from gaseous releases to any organ was 6.71 E-01 mrem (child/bone) based on measured effluents and average meteorological data, and 6.11E-01 mrem (child/bone) based on measured effluents and concurrent meteorological data. The maximum total dose from gaseous releases to the whole body was 1.37E-01 mrem (child) based on measured effluents and average meteorological data, and 1.26E-01 mrem (child) based on measured effluents and concurrent meteorological data.

3.2 Liquid Effluent Pathways The principal pathways through the aquatic environment for potential doses to man from liquid waste are ingestion of potable water and eating aquatic foods. Liquid dose was calculated based on the ingestion of potable water and sport fish. It should be noted, however, there were no communities within 10 km downstream of the plant using the Rock River for drinking water. NRC-developed equations were used to calculate the doses to the whole body, bone, liver, thyroid, kidney, lung, lower GI tract, and skin. Specific parameters for use in the equations are given in the Exelon Offsite Dose Calculation Manual (ODCM). The maximum dose from liquid releases to any organ was 2.15E-01 mrem (adult/gilli). The maximum dose from liquid releases to the whole body was 1.49E-01 mrem (adult).

3.3 Total Dose The maximum total dose to any organ via both gaseous and liquid effluents to any organ is 6.72E-01 mrem (child/bone). The maximum dose to the whole body via both gaseous and liquid effluents is 2.62E-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.

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

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

to any organ during any calendar quarter and 15 mrem during a calendar year.

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

4.0 SITE METEOROLOGY Detailed records of the site meteorological measurements taken during each calendar quarter of the year are maintained by the meteorological vendor, retained on site, and are available upon request. The data are presented as cumulative joint frequency distributions of the wind direction for the 250' level and wind speed class by atmospheric stability class determined from the temperature difference between the 250' and 30' levels. Data recovery for all measurements on the meteorological tower was 99.8% during 2011.

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APPENDIX E-1 DATA TABLES AND FIGURES 105 of 200

106 of 200 Table 1.1-1 EFFLUENT AND WASTE DISPOSAL REPORT TABLE 1A GASEOUS EFFLUENTS - SUMMATION OF ALL RELEASES Unit 1 REPORT FOR 2011 Units QTR 1 QTR 2 QTR 3 QTR 4 YEAR Fission and Activation Gases

1. Total Release Ci 1.10E-01 1.20E-01 4.05E-02 8.20E-03 2.80E-01

2. Avg. Release Rate uCi/sec 1.41E-02 1.53E-02 5.10E-03 1.03E-03 8.88E-03 Iodine-131

1. Total Release Ci 1.75E-05 1.60E-06 (1) (1) 1. 91E-05

2. Avg. Release Rate uCi/sec 2.25E-06 2.04E-07 (1) (1) 6. 05E-07 Particulates Half Life >= 8 da ys

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

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

Others

1. Total Release Ci 9.55E-01 7.99E-01 1.18E+00 1.20E+00 4.13E+00

2. Avg. Release Rate uCi/sec 1.23E-01 1.02E-01 1.48E-01 1.51E-01 1.31E-01 Tritium

1. Total Release Ci 3.95E+00 3.01E+00 3.14E+00 5.31E+00 1.54E+01

2. Avg. Release Rate uCi/sec 5.07E-01 3.82E-01 3.95E-01 6.68E-01 4.89E-01 Gross Alpha Radioactivity

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

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

(1) Less than minimum detectable activity which meets the lower limit of detection (LLD) requirements of TRM Section 3.11 E-1.1 107 of 200

Table 1.1-1 (cont.)

EFFLUENT AND WASTE DISPOSAL REPORT TABLE 1A GASEOUS EFFLUENTS - SUMMATION OF ALL RELEASES Unit 2 REPORT FOR 2011 Units QTR 1 QTR 2 QTR 3 QTR 4 YEAR Fission and Activation Gases

1. Total Release Ci 9.49E-01 1.28E-01 4.48E-02 1.48E-03 1.12E+00

2. Avg. Release Rate uCi/sec 1.22E-01 1.63E-02 5.64E-03 1.86E-04 3.55E-02 Iodine-131

1. Total Release Ci 2.42E-05 3.14E-05 (1) (i) 5. 56E-05

2. Avg. Release Rate uCi/sec 3.11E-06 4.OOE-06 (1) (i) 1.76E-06 Particulates Half Life >= 8 days

1. Total Release Ci (1) 1.04E-06 3.35E-07 (1) 1.37E-06

2. Avg. Release Rate uCi/sec (I) 1.32E-07 4.22E-08 (1) 4. 35E-08 Others

1. Total Release Ci 1.13E+00 1.02E+00 8.80E-01 1.08E+00 4.10E+00

2. Avg. Release Rate uCi/sec 1.45E-01 1.30E-01 1.lIE-01 1.35E-01 1.30E-01 Tritium

1. Total Release Ci 1.56E+01 1.02E+01 1.10E+01 7.26E+00 4.41E+01

2. Avg. Release Rate uCi/sec 2.OOE+00 1.30E+00 1.38E+00 9.13E-01 1.40E+00 Gross Alpha Radioactivi ty

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

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

(1) Less than minimum detectable activity which meets the lower limit of detection (LLD) requirements of TRM Section 3.11 E-1.2 108 of 200

Table 1.2-1 EFFLUENT AND WASTE DISPOSAL REPORT TABLE 2A LIQUID EFFLUENTS - SUMMATION OF ALL RELEASES Unit 1 REPORT FOR 2011 Units QTR 1 QTR 2 QTR 3 QTR 4 YEAR Fission and Activation Products

1. Total Release Ci 3.63E-03 3.69E-03 3.83E-03 1.49E-03 1.26E-02

2. Avg. Diluted Conc. uCi/ml 1.23E-09 1.09E-09 1.03E-09 4.63E-10 9.53E-10 Tritium

1. Total Release Ci 6.29E+02 3.30E+02 2.75E+02 5.70E+01 1.29E+03

2. Avg. Diluted Conc. uCi/ml 2.13E-04 9.78E-05 7.38E-05 1.77E-05 9.73E-05 Dissolved and Entrained Gases

1. Total Release Ci 4.27E-04 2.67E-05 1.61E-04 (1) 6. 15E-04

2. Avg. Diluted Conc. uCi/ml 1.45E-10 7.92E-12 4.33E-11 (1) 4. 64E-11 Gross Alpha Radioactivity

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

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

Volume of liquid waste liters 2.95E+09 3.38E+09 3.72E+09 3.22E+09 1.33E+10 (1) Less than minimum detectable activity which meets the lower limit of detection (LLD) requirements of TRM Section 3.11 E-1.3 109 of 200

Table 1.2-1 (cont.)

EFFLUENT AND WASTE DISPOSAL REPORT TABLE 2A LIQUID EFFLUENTS - SUMMATION OF ALL RELEASES Unit 2 REPORT FOR 2011 Units QTR 1 QTR 2 QTR 3 QTR 4 YEAR Fission and Activation Products

1. Total Release Ci 3.63E-03 3.69E-03 3.83E-03 1.49E-03 1.26E-02

2. Avg. Diluted Conc. uCi/ml 1.23E-09 1.09E-09 1.03E-09 4.63E-10 9.53E-10 Tritium

1. Total Release Ci 6.29E+02 3.30E+02 2.75E+02 5.70E+01 1.29E+03

2. Avg. Diluted Conc. uCi/ml 2.13E-04 9.78E-05 7.38E-05 1.77E-05 9.73E-05 Dissolved and Entrained Gases

1. Total Release Ci 4.27E-04 2.67E-05 1.61E-04 (1) 6. 15E-04

2. Avg. Diluted Conc. uCi/ml 1.45E-10 7.92E-12 4.33E-Il (1) 4. 64E-11 Gross Alpha Radioactivity

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

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

Volume of liquid waste liters 2.95E+09 3.38E+09 3.72E+i09 3.22E+09 1.33E+10 (1) Less than minimum detectable activity which meets the lower limit of detection (LLD) requirements of TRM Section 3.11 E-1.4 110 of 200

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

SUMMARY

Unit 1 & 2 Report for: 2011 Unit Range - From: 1 To: 2 I&P DOSE LIMIT ANALYSIS ANNUAL 2011 Age Dose Limit Max % of Annual - Limit Group Organ (mrem) (mrem) Limit 2011 - Admin. Any Organ CHILD BONE 6.71E-01 1.13E+01 5. 96E+00 2011 - Admin. Total Body CHILD TBODY 1.37E-01 1.05E+01 1.31E+00 2011 - T.Spc. Any Organ CHILD BONE 6.71E-01 1.50E+01 4.47E+00 Receptor: 5 Composite Crit. Receptor - IP Distance: 800 (meters) Compass Point: SSE Critical Pathway: Vegetation Major Contributors ( 0% or greater to total)

Nuclide Percentage H-3 0. OOE+00 C-14 1. 00E+02 CO-58 9.26E-06 1-131 1 . 97E-03 1-132 2. 54E-05 1-133 7.55E-06 2011 - T.Spc. Total Body CHILD TBODY 1.37E-01 1.50E+01 9.17E-01 Receptor: 5 Composite Crit. Receptor - IP Distance: 800 (meters) Compass Point: SSE Critical Pathway: Vegetation Major Contributors ( 0% or greater to total)

Nuclide Percentage H-3 2.44E+00 C-14 9.76E+01 CO-58 7.91E-05 1-131 5.55E-03 1-132 1.22E-04 1-133 1.91E-05 E-1.5 111 of 200

Table 3.1-1 (cont.)

40CFR190 URANIUM FUEL CYCLE DOSE REPORT GASEOUS DOSE

SUMMARY

Unit 1 & 2 Report for: 2011 Unit Range - From: 1 To: 2 NG DOSE LIMIT ANALYSIS ANNUAL 2011 Dose Limit Max % of Annual - Limit (mrad) (mrad) Limit 2011 - Admin. Gamma 5.02E-05 7.50E+00 6.70E-04 2011 - Admin. Beta 2.25E-05 1.50E+01 1 . 50E-04 2011 - T.Spc. Gamma 5.021E-05 1.OOE+01 5.02E-04 Receptor: 4 Composite Crit. Receptor - NG Distance: 800 (meters) Compass Point: SSE Nuclide Percentage AR-41 4.23E+01 KR-87 9.84E-03 KR-85M 3.57E-02 XE-135 2.61E+00 XE-133M 8.51E-02 KR-88 2.95E-01 XE-131M 1.94E-01 XE-133 5.45E+01 2011 - T.Spc. Beta 2.25E-05 2.00E+01 1. 13E-04 Receptor: 4 Composite Crit. Receptor - NG Distance: 800 (meters) Compass Point: SSE Nuclide Percentage AR-41 8.17E+00 KR-87 9.01E-03 KR-85M 3.14E-02 XE-135 1.83E+00 XE-133M 2.11E-01 KR-88 3.12E-02 XE-131M 7.57E-01 XE-133 8.90E+01 E-1.6 112 of 200

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

SUMMARY

Unit 1 & 2 Report for: 2011 Unit Range - From: 1 To: 2 Liquid Receptor

=== PERIOD DOSE BY ORGAN AND AGE GROUP (mrem) ANNUAL 2011 Agegrp Bone Liver Thyroid Kidney Lung GI-LLI Skin TB ADULT 9.67E-04 1.49E-01 1.46E-01 1.47E-01 1.47E-01 2.15E-01 0.00E+00 1.49E-01 TEEN 1.02E-03 1.12E-01 1.10E-01 1.10E-01 1.10E-01 1.58E-01 0.00E+00 1. 12E-01 CHILD 1.31E-03 1.24E-01 1.22E-01 1.23E-01 1.23E-01 1.40E-01 0.OOE+00 1.25E-01 INFANT 5.26E-06 5.43E-02 5.43E-02 5.43E-02 5.43E-02 5.44E-02 0.00E+00 5.44E-02

=== SITE DOSE LIMIT ANALYSIS ANNUAL 2011 Age Dose Limit Max % of Annual - Limit Group Organ (mrem) (mrem) Limit 2011 - Admin. Any Organ ADULT GILLI 2.15E-01 7.50E+00 2.87E+00 2011 - Admin. Total Body ADULT TBODY 1.49E-01 2.25E+00 6. 62E+00 2011 - T.Spc. Any Organ ADULT GILLI 2.15E-01 1.00E+01 2.15E+00 Critical Pathway: Fresh Water Fish - Sport (FFSP)

Major Contributors ( 0% or greater to total)

Nuclide Percentage H-3 6.81E+01 CR-51 3.69E-02 MN-54 3.79E-01 FE-55 9.48E-02 FE-59 3.31E-01 CO-58 5.46E+00 CO-60 2.59E+00 ZR-95 1.13E-03 NB-95 2.30E+01 1-132 5.56E-06 CS-137 4.27E-03 2011 - T.Spc. Total Body ADULT TBODY 1.49E-01 3.00E+00 4.97E+00 Critical Pathway: Fresh Water Fish - Sport (FFSP)

Major Contributors ( 0% or greater to total)

Nuclide Percentage H-3 9. 83E+01 CR-51 2 .12E-04 MN-54 3.41E-02 FE-55 5 . 57E-02 FE-59 5 49E-02 CO-58 8.71E-01 CO-60 4. 39E-01 E-1.7 113 of 200

Table 3.2-1 (cont.)

40CFR190 URANIUM FUEL CYCLE DOSE REPORT Nuclide Percentage ZR-95 3.48E-07 NB-95 2.94E-03 1-132 1.49E-05 CS-137 2.09E-01 E-1.8 114 of 200

Table 3.4-1 The following are the maximum annual calculated cumulative offsite doses resulting from Byron airborne releases in 2011 based on concurrent meteorological data:

Unit 1:

Dose Maximum Value Sector Affected gamma air (1) 3.610 x 10-6 mrad North-Northwest beta air (2) 3.690 x 10-6 mrad North-Northwest whole body (3) 6.222 xl0-2 mrem North-Northwest skin (4) 4.440 x 10-6 mrem North-Northwest organ (5)(child-bone) 3.065 x 10' mrem North-Northwest Unit I Compliance Status 10 CFR 50 Appendix I Yearly Objective % of Appendix I gamma air 10.0 mrad0.00 beta air 20.0 mrad0.00 whole body 5.0 mrem 1.24 skin 15.0 mrem 0.00 organ 15.0 mrem 2.04 Unit 2:

Sector Dose Maximum Value Affected gamma air 5.070 x 10-6 mrad North-Northwest beta air (2) 1.230 x 10-5 mrad North-Northwest whole body (3) 6.351 xl0-2 mrem North-Northwest skin (4) 7.820 X 10-6 mrem North-Northwest organ (5) (child-bone) 3.043 x 10-1 mrem North-Northwest Unit 2 Compliance Status 10 CFR 50 Appendix I Yearly Objective % of Appendix I gamma air 10.0 mrad0.00 beta air 20.0 mrad0.00 whole body 5.0 mrem 1.27 skin 15.0 mrem 0.00 organ 15.0 mrem 2.03 (1)

Gamma Air Dose - GASPAR II, NUREG-0597 (2)

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

Whole Body Dose - GASPAR II, NUREG-0597 (4)

Skin Dose - GASPAR I, NUREG-0597 (5) Inhalation and Food Pathways Dose - GASPAR II, NUJREG-0597 Data recovery: 99.8%

E-1.9 115 of 200

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APPENDIX F METEOROLOGICAL DATA 117 of 200

118 of 200 Byron Generating Station Period of Record: January - March 2011 Stability Class - Extremely Unstable - 250Ft-30Ft Delta-T (F)

Winds Measured at 30 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 0 0 0 0 0 NNE 0 0 0 0 0 0 0 NE 0 0 0 0 0 0 0 ENE 0 0 0 0 0 0 0 E 0 0 1 0 0 0 1 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 1 0 0 0 1 W 0 0 0 0 0 0 0 WNW 0 0 0 0 0 0 0 NW 0 0 0 0 0 0 0 NNW 0 0 0 0 0 0 0 Variable 0 0 0 0 0 0 0 Total 0 0 2 0 0 0 2 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 4 F-I 119 of 200

Byron Generating Station Period of Record: January - March 2011 Stability Class - Moderately Unstable - 250Ft-3OFt Delta-T (F)

Winds Measured at 30 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 0 0 0 0 0 NNE 0 0 2 0 0 0 2 NE 0 0 2 0 0 0 2 ENE 0 0 3 0 0 0 3 E 0 0 0 0 0 0 0 ESE 0 1 0 0 0 0 1 SE 0 0 0 0 0 0 0 SSE 0 0 0 0 0 0 0 S 0 0 0 0 0 0 0 SSW 0 0 0 0 0 0 0 SW 0 0 1 0 0 0 1 WSW 0 0 2 0 0 0 2 W 0 0 1 0 0 0 1 WNW 0 0 0 2 0 0 2 NW 0 0 1 0 0 0 1 NNW 0 0 0 2 0 0 2 Variable 0 0 0 0 0 0 0 Total 0 1 12 4 0 0 17 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: 4 F-2 120 of 200

Byron Generating Station Period of Record: January - March 2011 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 NNE 0 NE 0 ENE 0 E 0 ESE SE SSE S

SSW SW WSW W 0 WNW 0 NW 0 NNW 0 Variable 0 Total 1 5 23 10 1 0 40 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: 4 F-3 121 of 200

Byron Generating Station Period of Record: January - March 2011 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 15 71 30 5 124 NNE 20 27 11 5 66 NE 18 40 9 6 76 ENE 36 56 20 0 119 E 55 46 8 0 114 ESE 17 12 8 1 43 SE 14 22 9 0 48 SSE 12 31 17 1 63 S 13 26 9 0 50 SSW 10 22 16 1 51 SW 24 36 11 0 74 WSW 21 24 15 6 71 W 32 24 25 23 110 WNW 33 47 13 1 98 NW 50 89 10 0 153 NNW 37 52 14 2 108 Variable 0 0 0 0 4 Total 63 407 625 225 51 1 1372 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: 4 F-4 122 of 200

Byron Generating Station Period of Record: January - March 2011 Stability Class - Slightly Stable - 250Ft-3OFt Delta-T (F)

Winds Measured at 30 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 2 12 1 0 0 0 15 NNE 2 14 6 0 0 0 22 NE 4 17 4 4 0 0 29 ENE 2 34 6 5 0 0 47 E 6 27 5 2 0 0 40 ESE 3 14 6 9 0 0 32 SE 1 5 6 6 0 0 18 SSE 1 6 19 5 0 0 31 S 2 3 23 14 0 0 42 SSW 3 11 20 8 1 0 43 SW 7 16 21 2 1 0 47 WSW 5 14 9 6 3 0 37 W 7 10 25 7 4 0 53 WNW 3 29 19 4 2 0 57 NW 5 41 10 0 0 0 56 NNW 4 13 1 0 0 0 18 Variable 2 0 0 0 0 0 2 Total 59 266 181 72 11 0 589 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: 4 F-5 123 of 200

Byron Generating Station Period of Record: January - March 2011 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 0 0 3 N 0 2 1 0 0 0 2 NNE 0 2 0 0 0 0 1 NE 0 1 0 0 0 0 2 ENE 0 2 0 0 0 0 12 E 7 3 1 0 0 0 7 ESE 2 5 0 0 0 0 10 SE 1 5 4 0 0 0 15 SSE 1 5 8 1 0 0 15 S 2 6 2 1 0 0 10 SSW 6 3 1 0 0 0 7 SW 3 4 0 0 0 0 7 WSW 4 3 0 0 0 0 10 W 2 1 0 0 0 2 WNW 1 1 0 0 0 0 5 NW 3 2 0 0 0 0 5 NNW 3 2 0 0 0 0 0 Variable 0 0 0 0 Total 40 48 18 2 0 0 108 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: 4 F-6 124 of 200

Byron Generating Station Period of Record: January - March 2011 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 0 0 0 0 N 0 0 0 0 0 0 0 NNE 0 1 1 0 0 0 0 NE 0 0 0 0 0 0 0 ENE 0 0 0 0 0 0 0 E 1 2 3 0 0 0 0 ESE 0 2 2 0 0 0 0 SE 0 1 1 0 0 0 0 SSE 0 0 0 0 0 0 0 S 0 3 3 0 0 0 0 SSW 3 2 5 0 0 0 0 SW 3 2 5 0 0 0 0 WSW 0 2 2 0 0 0 0 W 2 1 3 0 0 0 0 WNW 2 0 2 0 0 0 0 NW 0 0 0 0 0 0 0 NNW 0 0 0 0 0 0 0 Variable 0 0 0 Total 11 16 0 0 0 0 27 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: 4 F-7 125 of 200

Byron Generating Station Period of Record: January - March 2011 Stability Class - Extremely Unstable - 250Ft-30Ft Delta-T (F)

Winds Measured at 250 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 0 0 0 0 0 NNE 0 0 0 0 0 0 0 NE 0 0 0 0 0 0 0 ENE 0 0 0 0 0 0 0 E 0 0 0 1 0 0 1 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 1 0 0 1 W 0 0 0 0 0 0 0 WNW 0 0 0 0 0 0 0 NW 0 0 0 0 0 0 0 NNW 0 0 0 0 0 0 0 Variable 0 0 0 0 0 0 0 Total 0 0 0 2 0 0 2 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 4 F-8 126 of 200

Byron Generating Station Period of Record: January - March 2011 Stability Class - Moderately Unstable - 250Ft-30Ft Delta-T (F)

Winds Measured at 250 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 0 0 0 0 0 NNE 0 0 0 0 0 0 0 NE 0 0 2 2 0 0 4 ENE 0 0 1 2 0 0 3 E 0 0 0 0 0 0 0 ESE 0 1 0 0 0 0 1 SE 0 0 0 0 0 0 0 SSE 0 0 0 0 0 0 0 S 0 0 0 0 0 0 0 SSW 0 0 0 0 0 0 0 SW 0 0 0 0 0 0 0 WSW 0 0 0 3 0 0 3 W 0 0 0 1 0 0 1 WNW 0 0 0 2 0 0 2 NW 0 0 1 0 0 0 1 NNW 0 0 0 0 2 0 2 Variable 0 0 0 0 0 0 0 Total 0 1 4 10 2 0 17 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: 4 F-9 127 of 200

Byron Generating Station Period of Record: January - March 2011 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 0 0 0 0 N 0 0 0 2 0 0 0 NNE 0 0 2 4 0 0 0 NE 0 0 4 3 2 0 0 ENE 0 0 5 3 0 0 0 E 0 1 4 0 1 0 0 ESE 0 4 5 0 0 0 0 SE 0 0 0 0 0 0 0 SSE 0 0 0 0 0 0 0 S 0 0 0 1 0 0 0 SSW 0 0 1 0 0 0 0 SW 0 0 0 WSW 0 0 0 3 0 1 4 W 0 0 2 1 0 0 3 WNW 0 0 0 4 1 0 5 NW 0 0 0 4 0 0 4 NNW 0 0 1 1 1 0 3 Variable 0 0 0 0 0 0 0 Total 0 5 16 16 2 1 40 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: 4 F-10 128 of 200

Byron Generating Station Period of Record: January - March 2011 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 10 36 45 21 5 120 NNE 3 8 21 26 14 6 78 NE 2 9 19 23 10 8 71 ENE 4 23 25 32 14 3 101 E 5 30 35 50 22 1 143 ESE 1 13 11 11 5 2 43 SE 5 5 13 13 12 0 48 SSE 2 1 14 25 14 6 62 S 0 2 23 8 9 3 45 SSW 0 6 15 15 13 1 50 SW 2 14 25 19 17 3 80 WSW 0 21 31 11 5 8 76 W 2 17 20 27 18 19 103 WNW 3 19 22 22 11 1 78 NW 1 13 45 85 8 0 152 NNW 1 12 36 24 13 1 87 Variable 2 2 0 0 0 0 4 Total 36 205 391 436 206 67 1341 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 31 Hours of missing stability measurements in all stability classes: 4 F-11I 129 of 200

Byron Generating Station Period of Record: January - March 2011 Stability Class - Slightly Stable - 250Ft-30Ft Delta-T (F)

Winds Measured at 250 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 7 5 0 0 12 NNE 0 2 11 6 1 0 20 NE 0 0 12 7 0 0 19 ENE 0 6 19 8 3 1 37 E 0 14 20 10 1 0 45 ESE 0 2 9 5 12 0 28 SE 1 1 11 4 11 3 31 SSE 0 2 7 3 14 2 28 S 2 1 2 8 16 6 35 SSW 0 4 3 9 18 3 37 SW 3 8 5 26 11 3 56 WSW 1 7 8 15 6 2 39 W 0 3 6 33 9 6 57 WNW 1 1 13 16 3 4 38 NW 2 2 20 50 1 0 75 NNW 0 4 13 8 0 0 25 Variable 0 0 0 0 0 0 0 Total 10 57 166 213 106 30 582 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 7 Hours of missing stability measurements in all stability classes: 4 F-12 130 of 200

Byron Generating Station Period of Record: January - March 2011 Stability Class - Moderately Stable - 250Ft-30Ft Delta-T (F)

Winds Measured at 250 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 2 3 1 0 7 NNE 0 2 1 0 0 3 NE 0 1 2 0 0 3 ENE 0 2 0 0 0 3 E 0 1 0 0 0 5 ESE 0 4 0 0 0 5 SE 0 5 3 2 0 11 SSE 0 4 3 2 4 13 S 0 2 2 0 6 2 12 SSW 0 0 0 3 0 1 4 SW 0 1 0 0 1 0 2 WSW 0 3 5 5 0 0 13 W 0 6 0 0 13 WNW 1 2 3 0 0 0 6 NW 0 0 3 0 0 0 3 NNW 0 1 3 1 0 0 5 Variable 0 0 0 0 0 0 0 Total 1 21 40 27 12 7 108.

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: 4 F-13 131 of 200

Byron Generating Station Period of Record: January - March 2011 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 0 0 0 NNE 0 0 0 0 0 NE 0 0 0 0 0 ENE 0 0 0 1 0 E 0 0 0 0 0 ESE 0 0 1 1 1 SE 0 0 1 0 0 SSE 0 0 1 0 0 s 0 0 2 0 0 SSW 0 0 0 0 0 SW 0 0 1 0 0 WSW 0 1 2 2 0 W 0 0 3 3 0 WNW 0 0 1 1 0 NW 0 3 2 0 0 NNW 0 0 1 0 0 Variable 0 0 0 0 0 Total 0 4 15 8 1 0 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: 4 F-14 132 of 200

Byron Generating Station Period of Record: April - June 2011 Stability Class - Extremely Unstable - 250Ft-30Ft Delta-T (F)

Winds Measured at 30 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 2 1 0 0 0 3 NNE 0 0 0 2 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 3 0 0 0 3 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 2 2 0 4 WNW 0 0 1 5 0 0 6 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 2 5 9 2 0 18 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 8 F-15 133 of 200

Byron Generating Station Period of Record: April - June 2011 Stability Class - Moderately Unstable - 250Ft-3OFt Delta-T (F)

Winds Measured at 30 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 0 1 0 0 1 NNE 0 0 1 2 0 0 3 NE 0 0 1 2 0 0 3 ENE 0 0 1 4 0 0 5 E 0 0 2 0 0 0 2 ESE 0 0 4 0 0 0 4 SE 0 0 0 0 0 0 0 SSE 0 0 0 0 0 0 0 s 0 0 2 2 0 0 4 SSW 0 1 3 1 0 0 5 SW 0 0 0 0 0 0 0 WSW 0 0 0 0 0 0 0 W 0 0 0 9 1 0 10 WNW 0 0 0 10 0 0 10 NW 0 0 0 2 0 0 2 NNW 0 0 0 0 0 0 0 Variable 0 0 0 0 0 0 0 Total 0 1 14 33 1 0 49 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 8 F-16 134 of 200

Byron Generating Station Period of Record: April - June 2011 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 2 0 0 2 NNE 0 0 1 5 0 6 NE 0 0 1 1 0 2 ENE 0 1 2 0 4 E 0 0 0 0 5 3

1 ESE 0 0 0 0 1 SE 0 0 3 0 0 3 SSE 0 1 0 3 5 S 0 0 6 6 0 12 SSW 0 2 2 4 3 11 SW 0 0 2 0 0 2 WSW 0 0 3 0 0 3 W 0 0 0 3 5 8 WNW 0 1 0 5 0 6 NW 0 0 8 3 0 11 NNW 0 0 0 0 1 Variable 0 0 0 0 0 0 Total 0 6 36 29 11 0 82 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: 8 F-17 135 of 200

Byron Generating Station Period of Record: April - June 2011 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 0 24 27 10 0 0 61 NNE 0 22 29 36 0 0 87 NE 2 11 24 18 8 0 63 ENE 0 15 58 31 18 1 123 E 1 38 56 1 0 0 96 ESE 1 17 34 12 1 0 65 SE 0 8 23 11 8 0 50 SSE 0 10 30 6 3 0 49 S 3 17 43 25 6 1 95 SSW 1 13 19 20 4 0 57 SW 1 15 36 12 0 0 64 WSW 0 6 29 13 1 0 49 W 1 3 28 26 11 0 69 WNW 2 10 41 35 3 0 91 NW 0 16 37 10 0 0 63 NNW 2 16 19 0 0 0 37 Variable 0 0 0 0 0 0 0 Total 14 241 533 266 63 2 1119 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: 8 F-18 136 of 200

Byron Generating Station Period of Record: April - June 2011 Stability Class - Slightly Stable - 250Ft-30Ft Delta-T (F)

Winds Measured at 30 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 16 7 0 30 NNE 15 11 4 34 NE 13 9 0 28 ENE 17 19 2 42 E 43 8 0 57 ESE 18 27 15 64 SE 18 18 8 50 SSE 21 32 6 62 S 13 25 10 50 SSW 19 33 10 69 SW 12 15 2 33 WSW 17 16 1 37 W 24 14 3 49 WNW 24 15 2 46 NW 10 6 1 22 NNW 9 1 1 13 Variable 0 0 0 1 Total 68 289 256 65 8 1 687 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: 8 F- 19 137 of 200

Byron Generating Station Period of Record: April - June 2011 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 1 0 0 0 N 3 8 12 0 0 0 0 NNE 1 2 3 0 0 0 0 NE 2 0 2 0 0 0 0 ENE 0 5 5 2 0 0 0 E 2 17 21 ESE 0 9 3 1 0 0 13 SE 1 16 4 0 0 0 21 SSE 4 14 16 1 0 0 35 S 1 4 4 1 0 0 10 SSW 7 4 0 0 0 0 11 SW 3 0 0 0 0 0 3 WSW 3 0 0 0 0 0 3 W 9 0 0 0 0 0 9 WNW 5 4 0 0 0 0 9 NW 7 1 0 0 0 0 8 NNW 2 1 0 0 0 0 3 Variable 0 0 0 0 0 0 0 Total 50 85 30 3 0 0 168 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: 8 F-20 138 of 200

Byron Generating Station Period of Record: April - June 2011 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 4 1 5 NNE 1 0 NE 1 0 ENE 0 0 E 1 ESE 3 SE 2 SSE 0 S 2 SSW 3 SW 1 WSW 3 W 2 0 WNW 1 0 0 0 NW 4 0 0 0 NNW 3 0 0 0 Variable 0 0 0 0 Total 31 16 3 0 0 0 50 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: 8 F-21 139 of 200

Byron Generating Station Period of Record: April - June 2011 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 3 0 0 0 3 NNE 0 0 0 2 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 3 0 0 3 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 1 4 1 6 WNW 0 0 0 4 0 0 4 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 3 10 4 1 18 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 8 F-22 140 of 200

Byron Generating Station Period of Record: April - June 2011 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 0 0 1 NNE 0 0 0 3 0 0 3 NE 0 0 0 2 0 0 2 ENE 0 0 0 1 4 0 5 E 0 0 1 3 0 0 4 ESE 0 0 2 1 0 0 3 SE 0 0 0 0 0 0 0 SSE 0 0 0 0 0 0 0 S 0 0 2 4 0 0 6 SSW 0 0 0 2 1 0 3 SW 0 0 0 0 0 0 0 WSW 0 0 0 0 0 0 0 W 0 0 0 5 6 0 11 WNW 0 0 0 5 4 0 9 NW 0 0 0 1 1 0 2 NNW 0 0 0 0 0 0 0 Variable 0 0 0 0 0 0 0 Total 0 0 5 28 16 0 49 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 8 F-23 141 of 200

Byron Generating Station Period of Record: April - June 2011 Stability Class - Slightly Unstable - 250Ft-3OFt Delta-T (F)

Winds Measured at 250 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 3 1 0 0 4 NNE 0 0 0 4 2 0 6 NE 0 0 0 1 0 0 1 ENE 0 0 2 1 0 4 E 0 1 2 2 0 0 5 ESE 0 0 1 1 0 0 2 SE 0 1 1 0 2 5 SSE 0 0 0 2 0 1 3 S 0 0 3 8 2 0 13 SSW 0 1 3 2 10 SW 0 0 2 0 2 WSW 0 0 1 0 4 W 0 0 0 2 7 WNW 0 0 0 0 6 NW 0 0 1 0 9 NNW 0 1 0 0 1 Variable 0 0 0 0 0 Total 0 4 18 35 18 7 82 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: 8 F-24 142 of 200

Byron Generating Station Period of Record: April - June 2011 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 0 14 16 16 8 0 54 NNE 1 14 19 18 26 13 91 NE 0 2 13 16 10 8 49 ENE 0 8 11 51 23 31 124 E 0 11 58 31 20 3 123 ESE 1 5 19 24 8 3 60 SE 0 5 19 13 14 11 62 SSE 0 8 18 20 9 5 60 S 0 8 13 23 16 9 69 SSW 0 10 6 19 20 6 61 SW 0 7 12 31 18 2 70 WSW 0 4 6 19 11 1 42 W 4 15 33 27 3 82 0

WNW 4 8 38 18 7 75 0

NW 10 10 32 7 4 63 0

NNW 11 11 12 0 0 34 0

Variable 0 0 0 0 0 0 Total 3 125 254 396 235 106 1119 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: 8 F-25 143 of 200

Byron Generating Station Period of Record: April - June 2011 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 11 6 0 0 22 NNE 7 18 7 0 34 NE 10 10 6 0 30 ENE 16 15 3 0 43 E 31 22 3 1 66 ESE 5 15 21 12 55 SE 7 21 16 8 53 SSE 12 12 20 5 54 S 9 17 33 1 65 SSW 6 24 27 5 67 SW 4 25 3 1 38 WSW 8 21 3 1 34 W 18 21 2 1 42 WNW 14 28 2 1 48 NW 12 7 1 0 26 NNW 7 2 0 1 12 Variable 0 0 0 0 0 Total 9 55 177 264 147 37 689 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: 8 F-26 144 of 200

Byron Generating Station Period of Record: April - June 2011 Stability Class - Moderately Stable - 250Ft-30Ft Delta-T (F)

Winds Measured at 250 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total 2 2 0 0 N 0 4 8 2 2 0 0 8 NNE 0 4 5 0 0 0 NE 0 2 7 2 0 0 0 ENE 0 1 3 E 2 4 5 1 5 0 17 ESE 0 3 0 6 2 1 12 SE 1 1 4 6 5 1 18 SSE 0 1 2 6 7 0 16 s 0 0 7 10 10 1 28 SSW 0 0 5 3 0 0 8 SW 0 1 4 2 0 0 7 WSW 1 0 3 0 0 0 4 W 0 0 3 2 0 0 5 WNW 0 1 8 0 0 0 9 NW 0 2 6 0 0 0 8 NNW 1 3 6 0 0 0 10 Variable 0 0 0 0 0 0 0 Total 5 27 64 40 29 3 168 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: 8 F-27 145 of 200

Byron Generating Station Period of Record: April - June 2011 Stability Class - Extremely Stable - 250Ft-3OFt Delta-T (F)

Winds Measured at 250 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 2 0 0 0 0 2 NNE 0 1 0 1 0 0 2 NE 0 1 0 0 0 0 1 ENE 0 3 0 0 0 0 3 E 1 3 1 0 0 0 5 ESE 0 1 0 1 0 0 2 SE 0 2 3 3 0 0 8 SSE 0 0 4 2 0 0 6 S 0 1 1 1 2 0 5 SSW 0 1 0 1 0 0 2 SW 0 1 1 0 0 0 2 WSW 0 1 0 0 0 0 1 W 0 0 2 0 0 0 2 WNW 0 1 0 0 0 0 1 NW 0 0 4 0 0 0 4 NNW 0 2 0 3 0 0 5 Variable 0 0 0 0 0 0 0 Total 1 20 16 12 2 0 51 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: 8 F-28 146 of 200

Byron Generating Station Period of Record: July - September 2011 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 S

SSW SW WSW 2 W 0 2 WNW 0 0 NW 0 1 0 NNW 0 2 0 Variable 0 0 0 Total 0 0 9 3 0 0 12 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-29 147 of 200

Byron Generating Station Period of Record: July - September 2011 Stability Class - Moderately Unstable - 250Ft-3OFt Delta-T (F)

Winds Measured at 30 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 1 0 0 0 0 1 NNE 0 1 1 1 0 0 3 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 1 0 0 0 0 1 SE 0 0 1 0 0 0 1 SSE 0 0 0 0 0 0 0 S 0 0 2 0 0 0 2 SSW 0 0 2 1 0 0 3 SW 0 0 1 1 0 0 2 WSW 0 0 2 0 0 0 2 W 0 0 1 1 0 0 2 WNW 0 1 1 0 0 0 2 NW 0 1 1 0 0 0 2 NNW 0 0 4 0 0 0 4 Variable 0 0 0 0 0 0 0 Total 0 5 16 4 0 0 25 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 3 F-30 148 of 200

Byron Generating Station Period of Record: July - September 2011 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 4 0 0 0 4 NNE 0 1 3 2 0 0 6 NE 0 0 0 0 0 0 0 ENE 1 0 0 0 0 0 1 E 0 0 0 0 0 0 0 ESE 0 0 1 0 0 0 1 SE 0 0 2 0 0 0 2 SSE 0 0 0 0 0 0 0 S 0 0 1 2 0 0 3 SSW 0 0 0 1 0 0 1 SW 0 1 4 0 0 0 5 WSW 0 2 7 0 0 0 9 W 0 1 2 4 0 0 7 WNW 0 1 3 0 0 0 4 NW 0 0 1 0 0 0 1 NNW 0 1 4 4 0 0 9 Variable 0 0 0 0 0 0 0 Total 1 7 32 13 0 0 53 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 3 F-31 149 of 200

Byron Generating Station Period of Record: July - September 2011 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 6 51 46 1 0 0 104 NNE 4 23 23 2 0 0 52 NE 3 8 10 0 0 0 21 ENE 4 6 3 0 0 0 13 E 10 18 4 0 0 0 32 ESE 3 17 5 0 0 0 25 SE 6 17 22 2 0 0 47 SSE 6 15 12 5 0 0 38 S 3 21 31 14 2 0 71 SSW 2 24 22 5 2 0 55 SW 4 24 14 5 0 0 47 WSW 5 37 11 1 0 0 54 W 15 35 24 1 0 0 75 WNW 6 17 10 7 5 0 45 NW 4 36 15 3 1 0 59 NNW 5 47 18 5 0 0 75 Variable 2 0 0 0 0 0 2 Total 88 396 270 51 10 0 815 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-32 150 of 200

Byron Generating Station Period of Record: July - September 2011 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 7 53 5 0 0 0 65 NNE 15 26 3 0 0 0 44 NE 6 15 4 0 0 0 25 ENE 4 28 1 0 0 0 33 E 14 24 2 0 0 0 40 ESE 9 20 15 0 0 0 44 SE 7 12 11 0 0 0 30 SSE 4 20 8 0 0 0 32 S 7 25 15 3 0 0 50 SSW 9 20 13 1 0 0 43 SW 6 28 19 0 0 0 53 WSW 14 24 11 1 0 0 50 W 5 15 5 0 0 0 25 WNW 16 17 8 0 0 0 41 NW 22 29 4 1 0 0 56 NNW 14 52 6 3 0 0 75 Variable 1 0 0 0 0 0 1 Total 160 408 130 9 0 0 707 Hours of calm in this stability class: 4 Hours of missing wind measurements in this stabili ty class: 0 Hours of missing stability measurements in all sta bility cl asses: 3 F-33 151 of 200

Byron Generating Station Period of Record: July - September 2011 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 8 22 2 0 0 0 32 NNE 3 9 0 0 0 0 12 NE 5 0 0 0 0 0 5 ENE 7 7 0 0 0 0 14 E 7 13 0 0 0 0 20 ESE 9 28 3 0 0 0 40 SE 4 17 0 0 0 0 21 SSE 5 32 1 1 0 0 39 S 9 30 2 0 0 0 41 SSW 18 13 2 0 0 0 33 SW 18 4 0 0 0 0 22 WSW 14 2 0 0 0 0 16 W 13 3 1 0 0 0 17 WNW 18 3 0 0 0 0 21 NW 16 5 0 0 0 0 21 NNW 24 20 0 0 0 0 44 Variable 0 0 0 0 0 0 0 Total 178 208 11 1 0 0 398 Hours of calm in this stability class: 4 Hours of missing wind measurements in this stabili ty class: 0 Hours of missing stability measurements in all sta bility cl asses: 3 F-34 152 of 200

Byron Generating Station Period of Record: July - September 2011 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 2 1 0 0 0 3 NNE 0 0 0 0 0 0 NE 1 0 0 0 0 1 ENE 1 0 0 0 0 1 E 0 6 0 0 0 6 ESE 6 8 0 0 0 14 SE 5 9 0 0 0 14 SSE 10 13 2 0 0 25 S 5 13 0 19 SSW 9 7 0 16 SW 7 0 0 7 WSW 4 0 0 4 W 0 0 9 WNW 19 0 0 19 NW 18 2 0 20 NNW 8 5 0 13 Variable 1 0 0 1 Total 105 64 0 172 Hours of calm in this stability class: 15 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 3 F-35 153 of 200

Byron Generating Station Period of Record: July - September 2011 Stability Class - Extremely Unstable - 250Ft-30Ft Delta-T (F)

Winds Measured at 250 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 NNE 0 NE 0 ENE 0 E 0 ESE 0 SE 0 SSE 0 S 0 SSW 0 SW 0 WSW 0 3 W 0 0 WNW 0 0 0 0 0 NW 0 1 0 0 1 NNW 0 0 0 2 Variable 0 0 0 0 0 Total 0 8 2 0 12 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-36 154 of 200

Byron Generating Station Period of Record: July - September 2011 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 NNE 0 NE 0 ENE 0 E 0 ESE 0 SE 0 SSE 0 S 0 SSW 0 SW 0 WSW 0 W

WNW 0 0 2 NW 0 0 2 NNW 0 0 1 Variable 0 0 0 Total 0 0 12 10 3 0 25 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 3 F-37 155 of 200

Byron Generating Station Period of Record: July - September 2011 Stability Class - Slightly Unstable - 250Ft-30Ft Delta-T (F)

Winds Measured at 250 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 0 2 0 0 2 NNE 0 1 0 6 1 0 8 NE 0 0 0 0 0 0 0 ENE 0 0 0 0 0 0 0 E 0 1 0 0 0 0 1 ESE 0 0 0 1 0 0 1 SE 0 0 1 1 0 0 2 SSE 0 0 0 0 0 0 0 S 0 0 0 2 1 0 3 SSW 0 0 0 1 1 0 2 SW 0 0 4 5 0 0 9 WSW 0 0 4 0 0 0 4 W 0 0 3 1 3 0 7 WNW 0 0 4 0 0 0 4 NW 0 0 1 0 0 0 1 NNW 0 0 2 3 4 0 9 Variable 0 0 0 0 0 0 0 Total 0 2 19 22 10 0 53 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 3 F-38 156 of 200

Byron Generating Station Period of Record: July - September 2011 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 24 34 28 0 0 87 NNE 2 18 14 20 2 0 56 NE 3 8 6 7 2 0 26 ENE 2 5 4 2 0 0 13 E 4 14 10 1 0 0 29 ESE 4 12 16 4 1 0 37 SE 6 10 14 13 1 2 46 SSE 2 9 20 10 3 4 48 S 3 11 21 18 12 3 68 SSW 1 12 15 12 3 2 45 SW 3 21 22 9 4 2 61 WSW 3 28 21 7 0 0 59 W 4 23 19 11 2 0 59 WNW 0 11 13 4 6 5 39 NW 2 12 28 11 0 4 57 NNW 3 30 31 14 5 1 84 Variable 1 0 0 0 0 0 1 Total 44 248 288 171 41 23 815 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: 3 F-39 157 of 200

Byron Generating Station Period of Record: July - September 2011 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 1 13 27 37 0 0 78 NNE 3 8 29 21 0 0 61 NE 0 7 7 13 2 0 29 ENE 1 11 16 8 0 0 36 E 4 14 13 11 4 0 46 ESE 3 5 8 14 9 0 39 SE 1 3 7 14 3 0 28 SSE 1 7 7 7 3 0 25 S 1 3 7 22 9 2 44 SSW 1 5 10 15 10 2 43 SW 0 10 20 29 14 0 73 WSW 1 8 7 14 0 0 30 W 2 3 17 16 1 0 39 WNW 2 5 14 12 1 0 34 NW 0 5 17 17 2 1 42 NNW 1 11 22 22 6 2 64 Variable 0 0 0 0 0 0 0 Total 22 118 228 272 64 7 711 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: 3 F-40 158 of 200

Byron Generating Station Period of Record: July - September 2011 Stability Class - Moderately Stable - 250Ft-30Ft Delta-T (F)

Winds Measured at 250 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 1 2 8 19 5 0 35 NNE 1 6 15 11 1 0 34 NE 0 7 12 10 0 0 29 ENE 3 3 3 1 0 0 10 E 2 6 9 7 0 0 24 ESE 1 5 7 13 9 0 35 SE 0 3 5 4 0 0 12 SSE 1 1 6 20 4 1 33 S 0 3 13 17 10 0 43 SSW 0 0 11 15 1 0 27 SW 1 1 10 12 0 0 24 WSW 0 1 15 8 0 0 24 W 3 3 9 1 0 0 16 WNW 2 3 6 2 1 0 14 NW 1 3 8 4 0 0 16 NNW 0 3 10 13 0 0 26 Variable 0 0 0 0 0 0 0 Total 16 50 147 157 31 1 402 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 3 F-41 159 of 200

Byron Generating Station Period of Record: July - September 2011 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 3 3 4 3 0 14 NNE 0 0 0 4 0 0 4 NE 0 3 1 0 0 0 4 ENE 2 4 0 0 0 0 6 E 1 4 3 3 0 0 11 ESE 1 1 1 5 1 0 9 SE 0 1 6 7 0 0 14 SSE 0 3 8 4 0 0 15 S 2 3 10 8 4 0 27 SSW 0 4 3 9 0 0 16 SW 0 7 9 1 0 0 17 WSW 0 7 4 6 0 0 17 W 1 2 1 0 0 0 4 WNW 1 4 5 0 0 0 10 NW 0 2 5 0 0 0 7 NNW 1 7 4 0 0 0 12 Variable 0 0 0 0 0 0 0 Total 10 55 63 51 8 0 187 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-42 160 of 200

Byron Generating Station Period of Record: October - December 2011 Stability Class - Extremely Unstable - 250Ft-3OFt Delta-T (F)

Winds Measured at 30 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total 0 0 0 0 0 0 N 0 0 0 0 0 0 0 NNE 0 0 0 0 0 0 0 NE 0 0 0 0 0 0 0 ENE 0 0 0 0 0 0 0 E 0 0 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 0 0 0 0 0 0 0 NNW 0 0 0 0 0 0 0 Variable 0 Total 0 0 0 0 0 0 0 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 0 F-43 161 of 200

Byron Generating Station Period of Record: October - December 2011 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 3 0 0 0 3 NNE 0 0 0 0 0 0 0 NE 0 0 0 0 0 0 0 ENE 0 0 0 0 0 0 0 E 0 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 2 0 0 0 2 S 0 1 2 0 0 0 3 SSW 0 0 2 0 0 0 2 SW 0 1 0 0 0 0 1 WSW 0 0 0 0 0 0 0 W 0 0 2 3 1 0 6 WNW 0 0 1 2 0 0 3 NW 0 1 0 0 0 0 1 NNW 0 0 0 0 0 0 0 Variable 0 0 0 0 0 0 0 Total 0 3 12 5 1 0 21 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 0 F -44 162 of 200

Byron Generating Station Period of Record: October - December 2011 Stability Class - Slightly Unstable - 250Ft-30Ft Delta-T (F)

Winds Measured at 30 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 1 4 0 0 0 NNE 0 0 1 0 0 0 NE 0 0 0 0 0 0 ENE 0 0 0 0 0 0 E 0 0 0 0 0 0 ESE 0 0 0 0 0 0 SE 0 0 1 0 0 0 SSE 0 1 1 0 0 0 s 0 1 2 2 0 0 SSW 0 5 1 3 0 0 SW 0 2 5 0 0 0 WSW 0 0 2 0 0 0 W 0 2 2 2 0 0 WNW 0 4 0 2 0 0 NW 0 3 1 0 0 0 NNW 0 0 0 0 0 0 Variable 0 0 0 0 0 0 Total 0 19 20 9 0 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-45 163 of 200

Byron Generating Station Period of Record: October - December 2011 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 11 79 29 5 0 125 NNE 10 29 21 1 0 63 NE 11 12 8 3 0" 37 ENE 7 11 3 0 0 25 E 12 7 0 0 0 24 ESE 5 2 0 0 0 7 SE 4 5 0 0 0 11 SSE 13 22 17 5 0 58 S 16 39 43 5 0 104 SSW 15 38 33 9 0 102 SW 25 30 7 1 0 64 WSW 13 25 8 2 0 52 W 34 19 30 4 0 91 WNW 29 33 30 4 1 99 NW 25 27 13 3 0 70 NNW 27 38 27 1 0 95 Variable 0 0 0 0 0 0 Total 41 257 416 269 43 1 1027 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 0 F-46 164 of 200

Byron Generating Station Period of Record: October - December 2011 Stability Class - Slightly Stable - 250Ft-30Ft Delta-T (F)

Winds Measured at 30 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 2 14 14 1 0 0 31 NNE 2 7 8 0 0 0 17 NE 1 4 8 1 0 0 14 ENE 2 6 9 1 0 0 18 E 4 5 4 0 0 0 13 ESE 2 8 2 0 0 0 12 SE 2 11 9 0 0 0 22 SSE 3 17 47 14 2 0 83 S 7 29 47 42 2 0 127 SSW 5 24 29 21 5 0 84 SW 7 23 18 0 0 0 48 WSW 2 12 22 4 2 0 42 W 12 36 51 7 1 0 107 WNW 13 23 11 1 0 0 48 NW 9 21 8 0 0 0 38 NNW 6 23 9 4 0 0 42 Variable 0 0 0 0 0 0 0 Total 79 263 296 96 12 0 746 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 0 F-47 165 of 200

Byron Generating Station Period of Record: October - December 2011 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 0 0 0 0 N 3 2 5 0 0 0 0 NNE 0 0 0 0 0 0 0 NE 1 1 2 0 0 0 0 ENE 2 2 4 0 0 0 0 E 1 6 7 4 0 0 0 ESE 1 12 17 1 0 0 0 SE 3 13 17 37 0 0 0 SSE 1 20 58 37 0 0 0 S 3 15 29 0 0 0 0 SSW 1 8 9 0 0 0 0 SW 3 3 6 0 0 0 0 WSW 5 2 7 1 0 0 0 W 8 15 24 0 0 0 0 WNW 11 4 15 0 0 0 0 NW 7 3 10 0 0 0 0 NNW 3 1 4 0 0 0 0 Variable 0 0 0 Total 53 107 54 0 0 0 214 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: 0 F-48 166 of 200

Byron Generating Station Period of Record: October - December 2011 Stability Class - Extremely Stable - 250Ft-3OFt Delta-T (F)

Winds Measured at 30 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 0 0 0 0 0 NNE 0 0 0 0 0 0 0 NE 1 0 0 0 0 0 1 ENE 0 0 0 0 0 0 0 E 4 7 0 0 0 0 11 ESE 3 8 1 0 0 0 12 SE 3 18 2 0 0 0 23 SSE 8 16 9 0 0 0 33 S 8 9 1 0 0 0 18 SSW 3 8 0 0 0 0 11 SW 1 0 0 0 0 0 1 WSW 0 0 0 0 0 0 0 W 3 0 0 0 0 0 3 WNW 10 0 0 0 0 0 10 NW 14 1 0 0 0 0 15 NNW 11 0 0 0 0 0 11 Variable 0 0 0 0 0 0 0 Total 69 67 13 0 0 0 149 Hours of calm in this stability class: 3 Hours of missing wind measurements in this stabili ty class: 0 Hours of missing stability measurements in all sta bility cliasses: 0 F-49 167 of 200

Byron Generating Station Period of Record: October - December 2011 Stability Class - Extremely Unstable - 250Ft-30Ft Delta-T (F)

Winds Measured at 250 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total 0 0 0 0 N 0 0 0 0 0 0 0 NNE 0 0 0 0 0 0 0 NE 0 0 0 0 0 0 0 ENE 0 0 0 0 0 0 0 E 0 0 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 0 0 0 0 0 0 0 NNW 0 0 0 0 0 0 0 Variable 0 0 0 Total 0 0 0 0 0 0 0 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 0 F-50 168 of 200

Byron Generating Station Period of Record: October - December 2011 Stability Class - Moderately Unstable - 250Ft-30Ft Delta-T (F)

Winds Measured at 250 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 3 0 0 0 3 NNE 0 0 0 0 0 0 0 NE 0 0 0 0 0 0 0 ENE 0 0 0 0 0 0 0 E 0 0 0 0 0 0 0 ESE 0 0 0 0 0 0 0 SE 0 0 0 0 0 0 0 SSE 0 0 1 2 0 0 3 S 0 1 1 0 0 0 2 SSW 0 0 1 2 0 0 3 SW 0 0 0 0 0 0 0 WSW 0 0 0 1 0 0 1 W 0 0 1 0 1 3 5 WNW 0 0 1 0 0 2 3 NW 0 1 0 0 0 0 1 NNW 0 0 0 0 0 0 0 Variable 0 0 0 0 0 0 0 Total 0 2 8 5 1 5 21 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 0 F-51 169 of 200

Byron Generating Station Period of Record: October December 2011 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 5 0 0 0 N 0 0 5 1 0 0 0 NNE 0 0 1 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 1 0 0 0 SE 0 0 1 SSE 0 1 0 1 0 0 2 S 0 2 2 2 1 0 7 SSW 0 1 3 1 2 0 7 SW 0 1 4 2 0 0 7 WSW 0 0 2 0 1 0 3 W 0 1 3 1 1 0 6 WNW 0 1 1 0 2 0 4 NW 0 3 1 1 0 0 5 NNW 0 0 0 0 0 0 0 Variable 0 0 0 0 0 0 0 Total 0 10 23 8 7 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-52 170 of 200

Byron Generating Station Period of Record: October - December 2011 Stability Class - Neutral - 250Ft-30Ft Delta-T (F)

Winds Measured at 250 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 1 3 27 57 15 13 116 NNE 1 5 11 32 19 9 77 NE 1 5 11 7 13 6 43 ENE 5 4 5 9 1 3 27 E 0 8 15 3 0 0 26 ESE 1 5 2 0 0 0 8 SE 0 4 4 3 0 0 11 SSE 0 3 15 17 10 7 52 S 1 10 17 41 27 11 107 SSW 2 11 10 42 29 12 106 SW 0 13 16 23 9 2 63 WSW 1 9 19 17 2 2 50 W 1 16 28 17 24 8 94 WNW 0 10 25 28 21 6 90 NW 4 5 24 20 18 5 76 NNW 0 5 26 27 17 6 81 Variable 0 0 0 0 0 0 0 Total 18 116 255 343 205 90 1027 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-53 171 of 200

Byron Generating Station Period of Record: October - December 2011 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 4 13 15 4 0 36 NNE 1 1 7 11 3 0 23 NE 0 0 8 5 1 0 14 ENE 2 3 5 16 2 0 28 E 0 4 6 3 1 0 14 ESE 0 3 3 3 1 0 10 SE 0 1 3 4 4 0 12 SSE 0 2 3 12 26 16 59 s 0 4 8 27 47 29 115 SSW 0 3 18 44 26 18 109 SW 0 3 28 9 13 0 53 WSW 0 2 10 22 8 3 45 W 0 3 25 54 18 2 102 WNW 0 4 16 22 6 0 48 NW 0 3 17 18 2 0 40 NNW 0 5 18 12 3 0 38 Variable 0 0 0 0 0 0 0 Total 3 45 188 277 165 68 746 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-54 172 of 200

Byron Generating Station Period of Record: October - December 2011 Stability Class - Moderately Stable - 250Ft-30Ft Delta-T (F)

Winds Measured at 250 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 1 3 0 0 0 4 NNE 1 0 1 0 0 0 2 NE 0 3 4 0 0 0 7 ENE 1 0 1 0 0 0 2 E 0 1 1 1 1 0 4 ESE 0 2 2 8 4 2 18 SE 0 0 2 5 0 0 7 SSE 0 1 2 5 9 4 21 s 0 1 1 18 27 1 48 SSW 0 1 3 16 2 0 22 SW 0 0 3 7 0 0 10 WSW 0 0 4 2 0 0 6 W 0 1 6 5 0 0 12 WNW 0 0 9 16 0 0 25 NW 0 1 5 12 0 0 18 NNW 1 2 4 1 0 0 8 Variable 0 0 0 0 0 0 0 Total 3 14 51 96 43 7 214 Hours of calm in this stability class: 0 Hours of missing wind measurements in this sta bility class: 0 Hours of missing stability measurements in all stability class es: 0 F-55 173 of 200

Byron Generating Station Period of Record: October - December 2011 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 1 2 0 0 0 4 NNE 0 1 2 0 0 0 3 NE 2 1 2 0 0 0 5 ENE 1 1 0 0 0 0 2 E 2 2 0 0 0 0 4 ESE 1 0 1 4 4 0 10 SE 0 0 3 4 5 1 13 SSE 0 4 7 6 4 2 23 S 0 2 6 20 8 0 36 SSW 0 1 1 5 1 0 8 SW 0 1 4 10 0 0 15 WSW 0 0 2 5 0 0 7 W 0 1 0 0 0 0 1 WNW 2 0 2 1 0 0 5 NW 0 2 3 6 0 0 11 NNW 0 2 0 3 0 0 5 Variable 0 0 0 0 0 0 0 Total 9 19 35 64 22 3 152 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-56 174 of 200

APPENDIX G ANNUAL RADIOLOGICAL GROUNDWATER PROTECTION PROGRAM REPORT (ARGPPR) 175 of 200

176 of 200 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 2011 Prepared By Teledyne Brown Engineering Environmental Services ExeIQu -fl5M Nuclear Byron Nuclear Generating Station Byron, IL 61010 May 2012 177 of 200

178 of 200 Table Of Contents I. Sum m ary and Conclusions ......................................................................................... 1 I1. Introduction ............................................................................................................. 3 A. O bjectives of the RG PP .................................................................................. 3 B. Im plem entation of the Objectives .................................................................. 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 ......................................................................... 10 E. Trends ......................................................................................................... 11 F. Investigations ................................................................................................. 11 G . Actions Taken .............................................................................................. 11 179 of 200

Appendices Appendix A Location Designation Tables Table A-1 Radiological Groundwater Protection Program - Sampling Locations, Distance and Direction, Byron Nuclear Generating Station, 2011 Figures Figure A-1 Monitoring Well Locations, Byron Nuclear Generating Station, 2011 (Extra wells noted on map are for reference only.)

Appendix B Data Tables Tables Table B-1.1 Concentrations of Tritium, Strontium-90, Gross Alpha, and Gross Beta in Groundwater Samples Collected in the Vicinity of Byron Nuclear Generating Station, 2011.

Table B-1.2 Concentrations of Gamma Emitters in Groundwater Samples Collected in the Vicinity of Byron Nuclear Generating Station, 2011.

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

Phase 2 of the RGPP was conducted by Exelon corporate and station personnel to initiate follow up of Phase 1 and begin long-term monitoring at groundwater locations selected during Phase 1. This is the sixth in a series of annual reports on the status of the Radiological Groundwater Protection Program (RGPP) conducted ai Byron Nuclear Generating Station. This report covers groundwater samples, collected from the environment, both on and off station property in 2011. During that time period, 101 analyses were performed on 49 samples from 13 locations.

Gamma-emitting radionuclides associated with licensed plant operations were not detected at concentrations greater than their respective Lower Limits of Detection (LLDs) as specified in the Offsite Dose Calculation Manual (ODCM) in any of the groundwater samples tested. In the case of tritium, Exelon specified that its laboratories achieve a lower limit of detection 10 times lower than that required by federal regulation.

In 2011, thirteen (13) Radiological Groundwater Protection Program (RGPP) monitoring wells were sampled. The samples were obtained quarterly throughout the sampling year and analyzed for tritium. Of these samples, three wells contained levels of tritium above the lower limit of detection (LLD) of 200 pCi/L. These were: AR-4 (777 to 912 pCi/L), AR-7 (199 to 318 pCi/L), and AR-11 (827 to 1,150 pCi/L). Wells AR-4 and AR-11 are near the Circulating Water Blowdown piping, where historical leakage through vacuum breakers was known to have occurred. Both of these wells are showing a slow but gradual overall decrease in tritium concentration since first sampled in 2006. Well AR-7, located just west of plant structures, last showed tritium (228 pCi/L) above the LLD in 2008. The tritium in this well is believed to be from precipitation recapture of permitted gaseous tritium releases from the plant that has entered the well during rainfall events as a result of improperly compacted soil around the well during original installation. The dose consequence from tritium present in these sample wells is negligible.

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Strontium-90 was not detected in any samples above the LLD of 1 pCi/L.

Gross Alpha and Gross Beta analyses in the dissolved and suspended fractions were performed on groundwater samples during the second sampling in 2011.

Gross Alpha (dissolved) was not detected in any of 8 groundwater locations.

Gross Alpha (suspended) was detected in 3 of 8 groundwater locations. The concentrations ranged from 1.0 to 3.7 pCi/L. Gross Beta (dissolved) was detected in 7 of 8 groundwater locations. The concentrations ranged from 4.1 to 21.2 pCi/L. Gross Beta (suspended) was not detected in any of the 8 groundwater locations. The concentrations of Gross Alpha and Gross Beta, which are slightly above detectable levels, are considered to be background and are not the result of plant effluents.

Hard-To-Detect analyses were not performed in 2011.

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 1,280 and 1,254 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 2011.

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 2011.

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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 gross alpha and gross beta in groundwater.

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

Several factors were important in the interpretation of the data:

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

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

Statistically, the exact value of a measurement is expressed as a range with a stated level of confidence. The convention is to report results with a 95% level of confidence. The uncertainty comes from calibration standards, sample volume or weight measurements, sampling uncertainty and other factors. Exelon reports the uncertainty of a measurement created by statistical process (counting error) as well as all sources of error (Total Propagated Uncertainty or TPU). Each result has two values calculated. Exelon reports the TPU by following the result with plus or minus +/- the estimated sample standard deviation, as TPU, that is obtained by propagating all sources of analytical uncertainty in measurements.

Analytical uncertainties are reported at the 95% confidence level in 186 of 200

this report for reporting consistency with the AREOR.

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

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

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

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

A major anthropogenic source of tritium and strontium-90 comes from the former atmospheric testing of thermonuclear weapons. Levels of tritium in precipitation increased significantly during the 1950s and early 1960s, and later with 187 of 200

additional testing, resulting in the release of significant amounts of tritium to the atmosphere. The Canadian heavy water nuclear power reactors, other commercial power reactors, nuclear research and weapons production continue to influence tritium concentrations in the environment.

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

RadNet provides tritium precipitation concentration data for samples collected at stations through out the U.S. from 1960 up to and including 2006. Based on GNIP data for sample stations located in the U.S. Midwest, tritium concentrations peaked around 1963. This peak, which approached 10,000 pCi/L for some stations, coincided with the atmospheric testing of thermonuclear weapons. Tritium concentrations in surface water showed a sharp decline up until 1975 followed by a gradual decline since that time. Tritium concentrations in Midwest precipitation have typically been below 100 pCi/L since around 1980. Tritium concentrations in wells may still be above the 200 pCi/L detection limit from the external causes described above. Water from previous years and decades is naturally captured in groundwater, so some well water sources today are affected by the surface water from the 1960s that was elevated in tritium.

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

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

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

Therefore, the typical background data provided may be subject to measurement uncertainty of approximately +/- 70 to 188 of 200

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-I.1, Appendix B). Tritium values ranged from less than the detection limit to 1,150 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 2011, three contained levels of tritium above the lower limit of detection (LLD) of 200 pCi/L. These were: AR-4 (777 to 912 pCi/L), AR-7 (199 to 318 pCi/L), and AR-11 (827 to 1,150 pCi/L). Both wells AR-4 and AR-1 1 have shown an overall decrease in tritium concentration since first sampled in 2006. The tritium in well AR-7 is believed to be from precipitation recapture of permitted gaseous tritium releases from the plant that has entered the well during rainfall events as a result of improperly compacted soil around the well during original installation. The tritium detected in groundwater samples has been isolated to the Galena-Platteville aquifer, which is isolated from the deeper regional groundwater aquifer by the semi-confining Glenwood Formation.

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

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Strontium Strontium-90 was not detected in any samples above the LLD of 1 pCi/L.

Gross Alpha and Gross Beta (dissolved and suspended)

Gross Alpha and Gross Beta analyses in the dissolved and suspended fractions were performed on groundwater surface water samples during the second sampling in 2011. Gross Alpha (dissolved) was not detected in any of 8 groundwater locations. Gross Alpha (suspended) was detected in 3 of 8 groundwater locations. The concentrations ranged from 1.0 to 3.7 pCi/L. Gross Beta (dissolved) was detected in 7 of 8 groundwater locations. The concentrations ranged from 4.1 to 21.2 pCi/L.

Gross Beta (suspended) was not detected in any of the 8 groundwater locations. The concentrations of Gross Alpha and Gross Beta, which are slightly above detectable levels, are considered to be background and are not the result of plant effluents.

Gamma Emitters Naturally occurring K-40 was detected in one sample at a concentration of 66 pCi/L. All other gamma-emitting radionuclides associated with licensed plant operations were not detected at concentrations greater than their respective Lower Limits of Detection (LLDs) in any of the samples during 2011.

Hard-To-Detect Hard-To-Detect analyses were not performed in 2011.

B. Drinking Water Well Survey No drinking water well surveys were conducted in 2011.

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

D. Leaks, Spills, and Releases There are no new previously unidentified leaks or plumes at Byron Station. There have been no new leaks, spills or releases at Byron Station in 2011.

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E. Trends Wells AR-4 and AR-1 1 have shown an overall decrease in tritium concentration since first sampled in 2006. Newly discovered tritium in Well AR-7 is be!ieved to be from precipitation recapture of permitted gaseous tritium releases from the plant that has entered the well during rainfall events as a result of improperly compacted soil around the well during original installation.

F. Investigations Additional AR-7 samples were obtained to more closely monitor the tritium in Well AR-7 subsequent to a positive detect in July, 2011.

G. Actions Taken

1. Compensatory Actions No compensatory actions were initiated in 2011.

2. Installation of Monitoring Wells No new monitoring wells were installed in 2011.

3. Actions to Recover/Reverse Plumes No actions were undertaken to recover/reverse plumes in 2011.

-11 -

191 of 200

Intentionally left blank 192 of 200

APPENDIX A LOCATION DESIGNATION 193 of 200

194 of 200 TABLE A-1: Radiological Groundwater Protection Program - Sampling Locations, Distance and Direction, Byron Nuclear Generating Station, 2011 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-I1 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-1 195 of 200

+.,+++++,

+,+:41

++ '* ...

~Figure A-1 Monitoring Well Locations, Byron Nuclear Generating Station, 2011

APPENDIX B DATA TABLES 197 of 200

198 of 200 TABLE B-I.1 CONCENTRATIONS OF TRITIUM, STRONTIUM-90, GROSS ALPHA, AND GROSS BETA COLLECTED IN THE VICINITY OF BYRON NUCLEAR GENERATING STATION, 2011 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION SITE DATE H-3 SR-90 GR-A (DIS) GR-A (SUS) GR-B (DIS) GR-B (SUS)

AR-1 03/07/11 < 139 AR-i 05/03/11 < 184 < 0.4 < 1.0 1.0 +/- 0.7 4.1 +/- 1.3 < 1.9 AR-1 07/19/11 < 172 AR-i 11/02/11 < 181 AR-10 03/07/11 < 174 AR-10 05/03/11 < 184

0.4 < 3.7 1.5 +/- 0.8 13.4 +/- 2.2 < 2.2 AR-10 07/19/11

171 AR-10 11/02/11 < 189 AR-11 03/07/11 827 +/- 139 AR-1l 05/09/11 919 +/- 159 AR-1I 07/20/11 1150 +/- 173 AR-11 11/02/11 894 +/- 157 AR-2 05/09/11 < 183 AR-2 11/02/11

183 AR-3 03/07/11 < 149 AR-3 05/09/11 < 188 < 0.7 <1.1 <0.8 6.6 +/- 1.5 < 2.0 AR-3 07/20/11

170 AR-3 11/02/11

181 AR-4 03/07/11 875 +/- 158 AR-4 05/09/11 818 +/- 157 < 0.7 < 1.9 3.7 +/- 1.5 5.2 +/- 1.6 < 2.1 AR-4 07/20/11 777 + 143 AR-4 11/02/11 912+ 158 AR-7 03/07/11

166 AR-7 05/03/11 199 + 124 < 0.5 <3.2 <0.4 21.2 +/- 2.4 17.5 +/- 2.3 AR-7 07/19/11 291 + 121 AR-7 08/29/11 269 + 120 AR-7 09/30/11

182 AR-7 11/02/11 318 + 133 AR-7 11/02/11 Re count 317 + 132 AR-8 03/07/11 < 155 AR-8 05/03/11

187 < 0.4 <1.2 <0.8 5.6 +/- 1.5 < 1.9 AR-8 07/19/11 < 173 AR-8 11/02/11 < 185 AR-9 03/07/11 < 182 AR-9 05/03/11

184 < 0.4 < 1.0 < 0.8 < 2.1 < 1.9 AR-9 07/19/11 < 171 AR-9 11/02/11 < 189 CAR-i 05/09/11 < 191 CAR-i 11/02/11

184 CAR-3 03/07/11 < 151 CAR-3 05/03/11 < 184 < 0.4 <2.4 <0.5 6.2 +/- 1.8 <2.2 CAR-3 07/19/11 < 170 CAR-3 11/02/11 < 166 DF-24 03/07/11 < 152 DF-24 05/09/11 < 185 DF-24 07/20/11 < 170 DF-24 11/02/11 < 184 TW-13 05/09/11 < 185 TW-13 11/02/11 < 181 B-1 199 of 200

TABLE B-I.2 CONCENTRATIONS OF GAMMA EMITTERS IN GROUNDWATER SAMPLES COLLECTED IN THE VICINITY OF BYRON NUCLEAR GENERATION STATION, 2011 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA SITE COLLECTION Be-7 K-40 Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 1-131 Cs-134 Cs-137 Ba-140 La-140 DATE BY-AR-1 5/3/2011 <22 <16 <2 <2 <5 <2 <4 <3 <5 <7 <2 <1 <44 <12 BY-AR-1 0 5/3/2011 < 21 < 46 <1 <2 <4 <1 <4 <2 <4 9 <1 <2 < 36 < 14 BY-AR-11 5/9/2011 <10 < 24 <1 <1 <2 <1 <2 <1 <2 13 <1 <1 < 16 <5 BY-AR-2 5/9/2011 < 11 < 22 <1 <1 <2 <1 <2 <1 <2 14 <1 <1 < 17 <6 BY-AR-3 5/9/2011 < 12 < 31 <1 <1 <3 <1 <2 <1 <2 15 <1 <1 < 20 <6 BY-AR-4 5/9/2011 < 10 <6 <1 <1 <2 <1 <2 <1 <2 14 <1 <1 < 16 <4 BY-AR-7 5/3/2011 < 23 < 19 <2 <2 <6 <2 <3 <3 <4 7 <2 <2

36 < 14 BY-AR-8 513/2011 < 19 < 38 <2 <2 <5 <2 <2 <2 <2 9 <1 <2 < 27 < 14 BY-AR-9 5/3/2011 < 17 < 45 <1 <2 <4 <1 <2 <2 <3 8 <1 <1 < 21 < 15 t CAR-1 5/9/2011 < 10 < 25 <1 <1 <3 <1 <2 <1 <2 14 <1 <1 <17 <4 R. CAR-3 5/3/2011 < 21 < 45 <2 <2 <4 <1 <3 <2 <4 7 <1 <1 < 31 < 13 TW-13 5/9/2011 < 10 66+/-27 <1 <1 <2 <1 <2 <1 <2 <15 <1 <1 <19 <4 k) 0 0'

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