Text

Annual Radiological Environmental Operation Report
	ML23122A068
Person / Time
Site:	Clinton
Issue date:	12/31/2022
From:	; Constellation Energy Generation, Teledyne Brown Engineering Environmental Services
To:	; Office of Nuclear Reactor Regulation
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ML23122A085	List: ML23122A068; U-604761, Submittal of 2022 Annual Radiological Environmental Operation Report;
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Constellation~

January 01, 2022 - December 31, 2022 ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERA TING REPORT CLINTON POWER STATION - DOCKET NUMBER 50-461 Prepared by:

Teledyne Brown Engineering Environmental Services April 2023

Intentionally Left Blank Table Of Contents I. Summary and Conclusions ................................................................................................ 1 II. Introduction ........................................................................................................................ 2 A. Objectives of the REMP .. ..'.................................................................................... 2 B. Implementation of the Objectives .......................................................................... 2 Ill. Program Description ........................................................................................................ 3 A. Sample Collection ................................................................................................. 3 B. Sample Analysis .................................................................................................... 5 C. Data Interpretation ................................................................................................ 5 D. Program Exceptions .............................................................................................. 6 E. Program Changes ................................................................................................. 8 IV. Results and Discussion ... ;............................................................................................... 9 A. Aquatic Environment ............................................................................................. 9

1. Surface Water ............................................................................................. 9

2. Drinking Water ............................................................................................ 9

3. Well Water ................................................................................................ 1O

4. Fish ........................................................................................................... 10

5. Shoreline Sediment .................................................................................. 10 B. Atmospheric Environment ................................................................................... 11

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

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

b. Airborne Iodine .............................................................................. 11

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

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

b. Food Products ............................................................................... 12

c. Grass ............................................................................................. 12 C. Ambient Gamma Radiation ................................................................................. 13 D. Independent Spent Fuel Storage Installation ..................................................... 13 E. Land Use Survey ................................................................................................. 13 F. Errata Data ........................................................................................................... 14 G. Summary of Results - Inter-laboratory Comparison Program ........................... 14 V. References ......................................................................................., .............................. 17

Appendices Appendix A Radiological Environmental Monitoring Report Summary Tables Table A-1 Radiological Environmental Monitoring Program Annual Summary for the Clinton Power Station, 2022 Appendix B Location Designation, Distance & Direction, and Sample Collection &

Analytical Methods Tables Table B-1 Radiological Environmental Monitoring Program - Sampling Locations, Distance and Direction, Clinton Power Station, 2022 Table B-2 Radiological Environmental Monitoring Program - Summary of Sample Collection and Analytical Methods, Clinton Power Station, 2022 Figures Figure B-1 Environmental Sampling Locations Within One Mile of the Clinton Power Station, 2022 Figure B-2 Environmental Sampling Locations Between One and Two Miles of the Clinton Power Station, 2022 Figure B-3 Environmental Sampling Locations Between Two and Five Miles of the Clinton Power Station, 2022 Figure B-4 Environmental Sampling Locations Greater Than Five Miles from of the Clinton Power Station, 2022 Appendix C Data Tables and Figures Tables Table C-1.1 Concentrations of 1-131 in Surface Water Samples Collected in the Vicinity of Clinton Power Station, 2022 Table C-1.2 Concentrations of Tritium in Surface Water Samples Collected in the Vicinity of Clinton Power Station, 2022 Table C-1.3 Concentrations of Gamma Emitters in Surface Water Samples Collected in the Vicinity of Clinton Power Station, 2022 Table C-I1.1 Concentrations of Gross Beta in Drinking Water Samples Collected in the Vicinity of Clinton Power Station, 2022 ii

Table C-I1.2 Concentrations of Tritium in Drinking Water Samples Collected in the Vicinity of Clinton Power Station, 2022 Table C-I1.3 Concentrations of 1-131 in Drinking Water Samples Collected in the Vicinity of Clinton Power Station, 2022 Table C-II.4 Concentrations of Gamma Emitters in Drinking Water Samples Collected in the Vicinity of Clinton Power Station, 2022 Table C-II1.1 Concentrations of Tritium in Well Water Samples Collected in the Vicinity of Clinton Power Station, 2022 Table C-111.2 Concentrations of Gamma Emitters in Well Water Samples Collected in the Vicinity of Clinton Power Station, 2022 Table C-IV.1 Concentrations of Gamma Emitters in Fish Samples Collected in the Vicinity of Clinton Power Station, 2022 Table C-V.1 Concentrations of Gamma Emitters in Sediment Samples Collected in the Vicinity of Clinton Power Station, 2022 Table C-Vl.1 Concentrations of Gross Beta in Air Particulate Samples Collected in the Vicinity of Clinton Power Station, 2022 Table C-Vl.2 Monthly and Yearly Mean Values of Gross Beta Concentrations in Air Particulate Samples Collected in the Vicinity of Clinton Power Station, 2022 Table C-Vl.3 Concentrations of Gamma Emitters in Air Particulate Samples Collected in the Vicinity of Clinton Power Station, 2022.

Table C-Vll.1 Concentrations of 1-131 in Air Iodine Samples Collected in the Vicinity of Clinton Power Station, 2022 Table C-VIIL 1 Concentrations of 1-131 in Milk Samples Collected in the Vicinity of Clinton Power Station, 2022 Table C-Vlll.2 Concentrations of Gamma Emitters in Milk Samples Collected in the Vicinity of Clinton Power Station, 2022 Table C-IX.1 Concentrations of Gamma Emitters in Vegetation Samples Collected in the Vicinity of Clinton Power Station, 2022 Table C-IX.2 Concentrations of Gamma Emitters in Grass Samples Collected in the Vicinity of Clinton Power Station, 2022 Table C-X.1 Quarterly DLR Results for Clinton Power Station, 2022 iii

Figures Figure C-1 Mean Monthly Gross Beta Concentration in Air Particulate Samples Collected in the Vicinity of CPS, 2022 Figure C-2 Mean Quarterly Ambient Gamma Radiation Levels (DLR) in the Vicinity of CPS, 2022 Appendix D Inter-Laboratory Comparison Program Tables Table D-1 Analytics Environmental Radioactivity Cross Check Program Teledyne Brown Engineering Environmental Services Table D-2 DOE's Mixed Analyte Performance Evaluation Program (MAPEP)

Teledyne Brown Engineering Environmental Services Table D-3 ERA Environmental Radioactivity Cross Check Program Teledyne Brown Engineering Environmental Services Appendix E Errata Data Appendix F Annual Radiological Groundwater Protection Program Report (ARGPPR) iv

I. Summary and Conclusions This report on the Radiological Environmental Monitoring Program (REMP) conducted for the Clinton Power Station (CPS) by Exelon Generation Company, LLC (Exelon) which split to form Constellation during 1st quarter of 2022, covers the period January 1, 2022, through December 31, 2022. During that time

.period, 1,593 analyses wer~ performed on 1,466 samples. In assessing all the data gathered for this report and comparing these results with preoperational data, it was concluded that the operation of CPS had no adverse radiological impact on the environment.

There were zero (0) radioactive liquid releases from CPS during 2022. Releases of gaseous radioactive materials were accurately measured in plant effluents.

There were no gaseous effluent releases that approached the limits specified in the CPS Offsite Dose Calculation Manual (ODCM). The highest calculated offsite dose received by a member of the public in 2022 due to the release of gaseous effluents from CPS was 3.11 E-01 mrem or 0.311 mrem.

Surface, drinking, and well water samples were analyzed for concentrations of tritium and gamma-emitting nuclides. Drinking water samples were also analyzed for concentrations of gross beta and iodine-131 (1-131 ). No fission or activation products were detected. No tritium or gross beta activity was detected, and the required lower limit of detection (LLD) was met.

Fish and shoreline sediment samples were analyzed for concentrations of gamma-emitting nuclides. No fission or activation products were detected in fish or shoreline sediment samples.

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

lodine-131 analyses were performed on weekly air samples. All results were less than the lower limit of detection for 1-131.

High sensitivity 1-131 analyses and gamma analyses were performed on cow milk samples. All results were below the required LLDs for 1-131.

Concentrations of naturally occurring K-40 were consistent with those detected in previous years. 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.

Grass samples were analyzed for concentrations of gamma-emitting nuclides.

No fission or activation products were detected.

Environmental gamma radiation measurements were performed quarterly using Dosimeters of Legal Record (DLR). Levels detected were consistent with those observed in previous years.

II. Introduction The Clinton Power Station (CPS), consisting of one approximately 1,120 MW gross electrical power output boiling water reactor is located in Harp Township, DeWitt County, Illinois. CPS is owned and operated by Constellation and became operational in 1987. Unit No. 1 went critical on February 27, 1987. The site encloses approximately 13,730 acres. This includes the 4,895 acre, man-made cooling lake and about 452 acres of property not owned by Constellation.

The plant is situated on approximately 150 acres. The cooling water discharge flume - which discharges to the eastern arm of the lake - occupies an additional 130 acres. Although the nuclear reactor, supporting equipment and associated electrical generation and distribution equipment lie in Harp Township, portions of the aforementioned 13,730 acre plot reside within Wilson, Rutledge, DeWitt, Creek, Nixon and Santa Anna Townships.

A Radiological Environmental Monitoring Program (REMP) for CPS was initiated in 1987. The preoperational period for most media covers the periods May 1980 through February 27, 1987 and was summarized in a separate report. This report covers those analyses performed by Teledyne Brown Engineering (TBE) and Landauer on samples collected during the period January 1, 2022, through December 31, 2022.

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

1. Provide data on measurable levels of radi~tion 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 raqiological 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 This section describes the general collection methods used by Environmental Inc. Midwest Labs (EIML) to obtain environmental samples for the CPS REMP in 2022. Sample locations and descriptions can be found in Tables B-1 and B-2, and Figures B-1 through B-4, Appendix B.

The sampling methods used by Environmental Inc. (Midwest Labs) are listed in Table B-2.

Aquatic Environment The aquatic environment was evaluated by performing radiological analyses on samples of surface water, drinking water, well water, fish, and shoreline sediment. Two gallon water samples were collected monthly and quarterly from composite samplers located at three surface water locations (CL-90, CL-91 and CL-99) and one drinking water location (CL-14). A monthly grab sample was obtained from one surface water location (CL-13). Quarterly samples were obtained from two well water locations (CL-7D and CL,-12). All samples were collected in new unused plastic bottles, which were rinsed at least twice with source water prior to collection. Fish samples comprising the flesh of largemouth bass, channel catfish, bluegill, carp, white crappie and white bass, the species most commonly harvested from the lakes by sporting fishermen, were collected semiannually at two locations, CL-19 and CL-105. CL-105 was the control location, which is located about 50 miles upwind of the station. Shoreline sediment samples composed of recently deposited substrate were collected at two locations semiannually (CL-07B and CL-105 (control)).

Atmospheric Environment The atmospheric environment was evaluated by performing radiological analyses on samples of air particulate, airborne iodine, milk, food produce and grass. Airborne iodine and particulate samples were collected and analyzed weekly and quarterly at ten locations (CL-1, CL-2, CL-3, CL-4, CL-6, CL-7, CL-8, CL-11, CL-15 and CL-94). CL-11 was the control location, which is located 16 miles upwind of the station. 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 filters were replaced weekly and sent to an independent laboratory for analysis.

Milk samples were collected biweekly at one location (CL-116) from May through October to coincide with the grazing season, and monthly from November through April. All samples were collected. in new unused plastic bottles from the bulk tank at the dairy farm, preserved with sodium bisulfite and shipped promptly to the laboratory.

Food products were collected once a month from June through September at three locations (CL-114, CL-115 and CL-118). The control location was CL-114, which is located 12.5 miles upwind of the station. Various broad leaf vegetable samples were collected and placed in new unused plastic bags and sent to the laboratory for analysis.

Grass samples were collected biweekly at four locations (CL-01, CL-02, CL-08 and CL-116) from May through October. CL-116 was the control location, which is located 14 miles WSW of the station. All samples were collected in new unused plastic bags and sent to the laboratory for analysis.

Ambient Gamma Radiation Direct radiation measurements were made using DLRs. Each location consisted of 2 dosimeter sets in a vented PVC conduit located a few feet off the ground. The DLRs were exchanged quarterly and sent to Landauer for analysis. The DLR locations were placed around the CPS site as follows:

An inner ring consisting of 16 locations (CL-1, CL-5, CL-22, CL-23,. CL-24, CL-34, CL-35, CL-36, CL-42 CL-43, CL-44, CL-45, CL-46, CL-47, CL-48, CL-63).

An outer ring consisting of 16 locations (CL-51, CL-52, CL-53, CL-54, CL-55, CL-56, CL-57, CL-58, CL-60, CL-61, CL-76, CL-77, CL-78, CL-79, CL-80, CL-81).

A special interest set consisting of seven locations (CL-37, CL-41, CL-49, CL-64, CL-65, CL-74 and CL-75) representing special interest areas.

A supplemental set consisting of 14 locations (CL-2, CL-3, CL-4, CL-6, CL-7, CL-8, CL-15, CL-33, CL-84, CL-90, CL-91, CL-97, CL-99, CL-114).

CL-11 rep,resents the control location for all environmental DLRs.

The specific DLR 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 meteorological sectors around the site, where estimated annual dose from CPS, if detected, would be most significant;

3. On hills free from local obstructions and within sight of the HVAC and VG stacks (where practical);

4. And near the closest dwelling to the HVAC and VG stacks in the prevailing downwind direction.

B. Sample Analysis This section describes the general analytical methodologies used by TBE and Environmental Inc. (Midwest Labs) to analyze and collect environmental samples for radioactivity for the CPS REMP in 2022.

The analytical procedures used by the laboratories are listed in Table B-2.

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

1. Concentrations of beta emitters in drinking water, air particulates and vegetables

2. Concentrations of gamma emitters in surface, drinking and well water, air particulates, milk, fish, grass, sediment and vegetables

3. Concentrations of tritium in surface, drinking and well water

4. Concentrations of 1-131 in air, milk, drinking water and surface water

5. Ambient gamma radiation levels at various off-site environs C. Data Interpretation The radiological and direct radiation data collected prior to CPS becoming operational was used as a baseline with which these operational data were compared. For the purpose of this report, CPS 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" value. 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 CPS detection capabilities for environmental sample analysis. ,

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 resulting in a negative number. A minimum detectable concentration (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, drinking water, well water, fish, and sediment:

12 nuclides, Mn-54, Co-58, Fe-59, Co-60, Zn-65, Nb-95, Zr-95, Cs-134, Cs-137, Ba-140, La-140 and Ce-144 were reported For milk: 13 nuclides, K-40, Mn-54, Co-58, Fe-59, Co-60, Zn-65, Nb-95, Zr-95, Cs-134, Cs-137, Ba-140, La-140 and Ce-144 were reported For grass and vegetation: 13 nuclides, Mn-54, Co-58, Fe-59, Co-60, Zn-65, Nb-95, Zr-95, 1-131, Cs-134, Cs-137, Ba-140, La-140 and Ce-144 were reported For air particulate: 9 nuclides, Co-60, Nb-95, Zr-95, Ru-103, Ru-106, Cs-134, Cs-137, Ce-141 and Ce-144 were reported The mean and standard deviation of the results were calculated. The standard deviation represents the variability of measured results for different samples rather than single analysis uncertainty.

D. Program Exceptions The exceptions (Issue Reports, IRs) described below are those that are considered 'deviations' from the Radiological Environmental Monitoring Program as required by the Station's ODCM. By definition, 'deviations' are permitted as delineated within NUREG-1302, "Offsite Dose Calculation Mani.Jal Guidance: Standard Radiological Effluent Controls for Boiling Water Reactors, Generic Letter 89-01, Supplement No. 1", April 1991, and within Radiological Assessment Branch Technical Position, Revision 1, November 1979, which states .... "Deviations are permitted from the required sampling schedule if specimens are unobtainable due to hazardous conditions, seasonal unavailability, malfunction of automatic sampling equipment and other legitimate reasons .... " The below section addresses the reporting requirements found within Section 6.0 of the Station's ODCM.

Exceptions/Anomalies

1. Air Particulate/Air Iodine Samples (IR 04551478, IR 04520264)

a. During weekly ODCM air sampling surveillance on 03/23/22, the Environmental, Inc. vendor identified that compositors CL-2 and CL-3 had lower than expected timer readings indicating a power outage.

b. During weekly ODCM air sampling surveillance on 08/31/22, the Environmental, Inc. vendor found non-ODCM air sampler CL-7 with no timer reading, indicating a power outage.

2. Drinking Water Compositor Repair (IR 04488545)

On 03/30/22, ODCM water compositor CL-14 was secured due to a leak in the sink from which the sample.is utilized. The 20-ml per hour sample could not be obtained and grab samples were obtained for the months of April and May 2022.

3. REMP Monitoring Sample Stations Damage (IR 04497692)

During the routine weekly ODCM sampling surveillance on 05/04/22, the Environmental Inc. Sampling vendor identified non-ODCM air sample station CL-6 was non-functional due to damage to the power pole, leaving it located on the ground.

Also, non-ODCM water compositor CL-99 was determined to be non-functional due to a loss of power. The outage lasted from May -

November 2022 and grab samples were obtained during these months.

4. Insufficient Vegetation (IR 04669802)

During the monthly vegetation sampling on 06/26/22 and 09/28/22, the Environmental, Inc. sampling vendor was not able to obtain sufficient vegetation. Substitutions were made for the June sampling to meet the required 3 types of vegetation being sampled.

Substitutions were not able to be made for the September sampling and 2 types of vegetation were sampled.

Throughout 2022, IRs were generated to document program exceptions that were entered into the corrective action program for trending purposes.

Missed Samples

1. AP/Al Location CL-06 (01/05/22) (IR 04471146)

During the weekly ODCM air sampling surveillance, the Environmental Inc. sampling vendor identified that the lock on the non-OCDM air sampler was frozen and no sample could be obtained. Multiple attempts to unfreeze the lock and obtain the sample but were unsuccessful. *

2. OSLO Location CL-78 (07/18/22) (IR 04511798)

The dosimeter could not be located after a search of the immediate area resulting in no measurement for CL-78 in the 2 nd quarter.

3. AP/Al Locations CL-6 1 CL-7, CL-11 (08/24/22) (IR 04523810)

The samples were damaged after receipt at the laboratory on 08/26/22 and results were invalid.

4. AP/Al Location CL-7 (08/31/22) (IR 04520264)

During the weekly surveillance, the Environmental Inc. sampling vendor found the non-ODCM air sampler with no timer reading, indicating a power outage and a valid sample could not be attained.

5. Surface Water Location CL-13 (12/28/22) OR 04545346)

The sampling vendor was unable to take a grab sample at non-ODCM location CL-13 due to a frozen lake.

Program exceptions were reviewed to understand the causes of the exception and to return to ODCM sample compliance before the next sampling frequency period. The overall sample recovery rate indicates that the appropriate procedures and equipment are in place to assure reliable program implementation.

E. Program Changes The location for site CL:-114 was changed to 12.5 miles WSW.

(IR 04521356)

There were no other program changes in 2022.

IV. Results and Discussion A. Aquatic Environment

1. Surface Water Composite samples were taken hourly at three locations (CL-90, CL-91 and CL-99) on a monthly schedule and grab samples were taken monthly from one location (CL-13). The following analyses were performed:

lodine-131 Monthly samples from location CL-90 were analyzed for 1-131 activity (Table C-1.1, Appendix C). No 1-131 was detected in any samples and the required LLD was met.

Tritium Monthly samples from all locations were composited quarterly and analyzed for tritium activity (Table C-1.2, Appendix C). No tritium was detected in any samples and the required LLD was met.

Gamma Spectrometry Samples from all locations were analyzed for gamma-emitting nuclides (Table C-1.3, Appendix C).

No plant-produced radionuclides were detected and all required LLDs were met.

2. Drinking Water Monthly composite samples were taken hourly at one location (CL-14). The following analyses were performed:

Gross Beta Monthly samples were analyzed for concentrations of gross beta. No gross beta was detected in any of the samples.

(Tables C-11.1, Appendix C)

Tritium Monthly samples were composited quarterly and analyzed for tritium activity. No tritium was detected in any samples and the required LLD was met. (Table C-I1.2, Appendix C) lodine-131 Monthly samples from location CL-14 were analyzed for 1-131 activity.

No 1-131 was detected in any samples and the required LLD was met.

(Table C-I1.3, Appendix C)

Gamma Spectrometry Monthly samples were analyzed for gamma-emitting nuclides. No plant-produced radionuclides were detected and all required LLDs were met. (Table C-11.4, Appendix C)

3. Well Water Quarterly grab samples were collected at two locations (CL-07D and CL-12, consisting of CL-12R [a raw water sample from this well] and CL-12T [same well water, but after treatment and available for consumption]). The following analyses were performed:

Tritium Samples from all locations were analyzed for tritium activity. No tritium was detected in any samples and the required LLD was met.

(Table C-111.1, Appendix C)

Gamma Spectrometry Samples from all locations were analyzed for gamma-emitting nuclides. No plant-produced radionuclides were detected and all required LLDs were met. (Table C-111.2, Appendix C)

4. Fish Fish samples comprised of largemouth bass, channel catfish, bluegill, carp, white crappie and white bass were collected at two locations (CL-19 and CL-105) semiannually. The following analysis was performed:

Gamma Spectrometry The edible portion of fish samples from both locations was analyzed for gamma-emitting nuclides. No plant-produced radionuclides were detected and all required LLDs were met. (Table C-IV.1, Appendix C)

5. Shoreline Sediment Aquatic shoreline sediment samples were collected at CL-078 and CL-105 semiannually. The following analysis was performed:

Gamma Spectrometry Shoreline sediment samples were analyzed for gamma-emitting nuclides. No plant-produced radionuclides were detected and all required LLDs were met. (Table C-V.1, Appendix C)

B. _Atmospheric Environment

1. Airborne

a. Air Particulates Continuous air particulate samples were collected from 10 locations on a weekly basis. The 10 locations were separated into three groups: Group I represents locations within one mile of the CPS site boundary (CL-2, CL-3, CL-4, CL-6, GL-15 and CL-94); Group II represents the locations at an intermediate distance within one to five miles of CPS (CL-1, CL-7 and CL-8);

and Group Ill represents the control location greater than five miles from CPS (CL-11). The following analyses were performed:

Gross Beta Weekly samples were analyzed for concentrations of beta emitters (Table C-Vl.1 and C-Vl.2 and Figure C-1, 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 CPS. The results from the On-Site locations (Group I) ranged from 8 to 43 E-3 pCi/m 3 with a mean of 20 E-3 pCi/m 3 . The results from the Intermediate Distance location (Group II) ranged from 8 to 42 E-3 pCi/m 3 with a mean of 19 E-3 pCi/m 3 . The results from the Control location (Group Ill) ranged from 12 to 43 E-3 pCi/m 3 with a mean of 22 E-3 pCi/m 3 . Comparison of the 2022 air particulate data with previous years' data indicate no 'measurable impact from the operation of CPS. In addition, a comparison of the weekly mean values for 2022 indicate no notable differences among the three groups.

Gamma Spectrometry Weekly samples were composited quarterly and analyzed for gamma-emitting nuclides. No plant-produced radionuclides were detected and all required LLDs were met.

(Table C-Vl.3, Appendix C)

b. Airborne Iodine Continuous air samples were collected from 10 locations (CL-1, CL-2, CL-3, CL-4, CL-6, CL-7, CL-8, CL-11, CL-15 and CL-94) and analyzed weekly for 1-131. All results were less than the MDC and the required LLD was met.

(Table C-Vll.1, Appendix C)

2. Terrestrial

a. Milk Samples were collected from CL-116 biweekly May through October to coincide with the grazing season, and monthly November through April. The following analyses were performed:

lodine-131 Milk samples were analyzed for concentrations of 1-131.

lodine-131 was not detected in any of the samples. The required LLD was met. (Table C-Vlll.1, Appendix C}.

Gamma Spectrometry Each milk sample was analyzed for concentrations of gamma-emitting nuclides. Naturally occurring K-40 activity was found in all samples. No plant-produced radionuclides were detected and all required LLDs were met. (Table C-Vlll.2, Appendix C}

b. Food Products Broadleaf vegetation samples were collected from three locations (CL-114, CL-115 and CL-118) monthly June through September to coincide with the harvest season. The following analysis was performed:

Gamma Spectrometry Each food product sample was analyzed for concentrations of gamma-emitting nuclides. No plant-produced radionuclides were detected and all required LLDs were met.

(Table C-IX.1, Appendix C)

c. Grass Samples were collected from four locations (CL-1, CL-2, CL-8, and CL-116) biweekly May through October. The following analysis was performed:

Gamma Spectrometry Each grass sample was analyzed for concentrations of gamma-emitting nuclides. No plant-produced radionuclides were detected and all required LLDs were met.

(Table C-IX.2, Appendix C)

C. Ambient Gamma Radiation Ambient gamma radiation levels were measured utilizing DLRs. Fifty-four DLR locations were established around the site. Results of DLR measurements are listed in Tables C-X.1, Appendix C.

A total of 215 OSLO measurements were made in 2022. The average dose from the inner ring was 18.7 mRem/quarter. The average dose from the outer ring was 19.0 mRem/quarter. The average dose from the special interest group was 18.7 mRem/quarter. the average dose from the supplemental group was 18.0 mRem/quarter. The quarterly measurements ranged from 14.3 to 22.8 mRem/quarter.

The inner ring and outer ring measurements compared well to the Control Station, CL-11, which ranged from 15.8 to 18.1 mRem/quarter with an average measurement of 16.9 mRem/quarter. A comparison of the Inner Ring and Outer Ring data to the Control Location data indicate that the ambient gamma radiation levels from all the locations were comparable.

The historical ambient gamma radiation data from the control location were plotted along with similar data from the Inner and Outer Ring Locations (Figure C-2, Appendix C).

D. Independent Spent Fuel Storage Installation (ISFSI)

Ambient gamma radiation levels were measured utilizing DLRs.

Fifty-four DLR locations were established around the site, which encompasses the ISFSI pad. ISFSI dose contribution is in the form of direct radiation as no liquid or gas releases are expected to occur.

Results of DLR measurements are listed in Table C-X.1, Appendix C.

E. Land Use Survey The Annual Land Use Survey conducted during the growing season around the Clinton Power Station (CPS) was performed by Environmental Inc. (Midwest Labs) for Constellation to comply with Clinton's Offsite Dose Calculation Manual, section 8.0. The report to CPS was dated October 3, 2022. The purpose of the survey was to document the nearest resident, milk-producing animal and garden of greater than 50 m2 in each of the sixteen 22 1/2 degree sectors around the site. The distance and direction of all locations from the CPS Station HVAC vent stack were positioned using Global Positioning System (GPS) technology. The Sector location for site CL-114 was changed to WSW for the previous year's Land Use Census. There were no changes required to the CPS REMP as a result of the Land Use Survey. The results of this survey are summarized below:

Distance in Kilometers from the CPS Station HVAC Vent Stack Sector Residence Garden Milk Animal (km) (km) (km) 1 N 1.50 1.50 1.50 2 NNE 1.50 4.78 >8 3 NE 2.07 >8 >.8 4 ENE 2.86 4.35 >8 5 E 1.67 1.67 >8 6 ESE 5.14 >8 >8 7 SE 4.44 >8 >8 8 SSE 2.90 4.32 >8 9 S 4.78 >8 >8 10SSW 4.68 >8 >8 11 SW 1.17 5.61 >8 12WSW 3.62 3.66 4.32 13W 1.95 >8 >8 14WNW 2.63 2.63 >8 15 NW 2.65 4.70 >8 16 NNW 2.05 2.05 2.05 F. Errata Data The highest calculated offsite dose was reported incorrectly in the 2021 AREOR. (See Appendix E for corrected information). (IR 04543917)

There was no other errata data for 2022.

G. Summary of Results - Inter-Laboratory Comparison Program The TBE Laboratory analyzed Performance Evaluation (PE) samples of air particulate, air iodine, milk, soil, vegetation, and water matrices for various analytes. The PE samples supplied by Analytics Inc.,

Environmental Resource Associates (ERA) and Department of Energy (DOE) Mixed Analyte Performance Evaluation Program (MAPEP), were evaluated against the following pre-set acceptance criteria:

A. Analytics Evaluation Criteria Analytics' evaluation report provides a ratio of TB E's result and Analytics' known value. Since flag values are not assigned by Analytics, TBE evaluates the reported ratios based on internal QC requirements based on the DOE MAPEP criteria.

B. 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, National Environmental Laboratory Accreditation Conference (NELAC), state-specific Performance Testing (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.

C. DOE Evaluation Criteria MAPEP's evaluation report provides an acceptance range with associated flag values. MAPEP defines three levels of performance:

Acceptable (flag = "A") - result within+/- 20% of the reference value

Acceptable with Warning (flag = "W') - result falls in the +/- 20%

to +/- 30% of the reference value

-* Not Acceptable (flag= "N") - bias is greater than 30% of the reference value Note: The Department of Energy (DOE) Mixed Analyte Performance Evaluation Program (MAPEP) samples are created to mimic conditions found at DOE sites which do not resemble typical environmental samples obtained at commercial nuclear power facilities.

For the TBE laboratory, 142 out of 150 analyses performed met the specified acceptance criteria. Eight analyses did not meet the specified acceptance criteria and were addressed through the TBE Corrective Action Program. NOTE: Two analyses (soil for Tc-99 and U-238) that did not meet acceptance criteria was performed for TBE information and is not on the list of required /GP analyses. A summary is found below:

1. The Analytics March 2022 AP Ce-141 result was evaluated as Not Acceptable. The reported value for Ce-141 was 60.9 pCi and the known result was 42.0 pCi/L (1.45 ratio of reported result vs. known; TBE's internal acceptance range is 0.70 - 1.30). This sample was used as the workgroup duplicate with a result of 45.7 (109% of known) and was also counted on a different detector with a result of 50.9 (121% of known). This was TBE's first failure for AP Ce-141.

(NCR 22-04)

2. The MAPEP February 2022 Urine U-234 & U-238 results were evaluated as Not Acceptable. TBE's reported values of 0.142 and 0.0254 were above the known upper ranges of 0.0096 and 0.0134 respectively for U-234 and U-238. These spiked values were below TBE's typical MDC for urine client samples. The samples were re-prepped using a larger sample aliquot and counted for 60 hours6.944444e-4 days 0.0167 hours 9.920635e-5 weeks 2.283e-5 months as opposed to 48 hours5.555556e-4 days 0.0133 hours 7.936508e-5 weeks 1.8264e-5 months . The recount results were 0.00732 for U-234 and 0.0119 for U-238 (both within acceptable range). MAPEP urine samples will be flagged to use a larger sample aliquot and counting time than typical client samples. MAPEP did not include any urine cross-check samples in August. (NCR 22-05)

3. The ERA MRAO September 2022 AP Pu-238 was evaluated as Not Acceptable. The reported value was 38.8 pCi and the known result was 29.9 (acceptance range 22.6 - 36.7). The AP filter was cut in half prior to digestion (shared with Fe-55) but should have been complete digested together and aliquotted afterwards like typical client samples. This is the first failure for AP Pu-238. (NCR 22-19)

4. The ERA October 2022 water Uranium result was evaluated as Not Acceptable. The reported value was 10.54 pCi/L and the known was 8.53 (acceptance range 6.60- 9.88) or 124% of the known (acceptable for TBE QC). The 2-sigma error was 3.2, placing the reported result well within the acceptable range. This sample was used as the workgroup duplicate with a result_ of 8.2 +/- 2.9 pCi/L (also within the acceptable range). All other QA was reviewed with no anomalies. (NCR 22-20)

5. The Analytics AP Co-60 result was evaluated as Not Acceptable. The reported value was 207 pCi and the known was 147 (141% of the known). TBE's internal QC acceptance is 70 - 130%. All QA was reviewed with no anomalies. This sample was used as the workgroup duplicate and counted on a different detector with a result of 167 pCi (114% of the known). This is the first failure for AP Co-60

- average result ratio compared to the known is 109%. (NCR 22-21}

6. The MAPEP August 2022 water Tc-99 result was evaluated as Not Acceptable. The reported value was 1.86 +/- 0.414 Bq/L for this "false positive" test. The evaluation of the submitted result to the 3 times the uncertainty indicated a slight positive. This sample was used as the workgroup duplicate with a result of 0.88 +/- 0.374 Bq/L.

All QC was reviewed, and no anomalies found. This is the first unacceptable since the resumption of reporting water Tc-99 for the 3 rd quarter of 2020. TBE to known ratios have ranged from 94-109%

during this time. (NCR 22-22)

The Inter-Laboratory Comparison Program provides evidence of "in control

counting systems and methods, and that the laboratories are producing accurate and reliable data.

V. References

1. American National Standards Institute, Inc., "Performance, Testing and Procedural Specifications for Thermoluminescent Dosimetry," ANSI N545-1975.

2. Code of Federal Regulations, Title 10, Part 20 (Nuclear Regulatory Commission).

3. CPS 2014 Annual Radioactive Effluent Release Report.

4. "Environmental Radioactivity," M. Eisenbud, 1987 (E187).

5. "Natural Radon Exposure in the United States," Donald T. Oakley, U.S.

Environmental Protection Agency. ORP/SID 72-1, June 1972.

6. Federal Radiation Council Report No. 1, "Background Material for the Development of Radiation Protection Standards," May 13, 1960.

7. International Commission on Radiation Protection, Publication 2, "Report of Committee II on Permissible Dose for Internal Radiation," (1959) with 1962 Supplement issued in ICRP Publication 6; Publication 9, "Recommendations on Radiation Exposure," (1965); ICRP Publication 7 (1965), amplifying specific recommendations of Publication 26 (1977).

8. International Commission on Radiation Protection, Publication No. 39 (1984), "Principles of Limiting Exposure to the Public to Natural Sources of Radiation".

9. "Radioactivity in the Environment: Sources, Distribution and Surveillance,"

Ronald L. Kathren, 1984.

10. National Council on Radiation Protection and Measurements, Report No.

22, "Maximum Permissible Body Burdens and Maximum Permissible Concentrations of Radionuclides in Air and Water for Occupational Exposure," (Published as National Bureau of Standards Handbook 69, issued June 1959, superseding Handbook 52).

11. National Council on Radiation Protection and Measurements, Report No.

39, "Basic Radiation Protection Criteria," January 1971.

12. National Council on Radiation Protection and Measurements, Report No.

44, "Krypton-85 in the Atmosphere -Accumulation, Biological Significance, and Control Technology," July 1975.

13. National Council on Radiation Protection and Measurements, Report No.

91, "Recommendations on Limits for Exposure to Ionizing Radiation," June 1987.

14. National Council on Radiation Protection and Measurements, Report No.

93, "Ionizing Radiation Exposure of the Population of the United States,"

September 1987.

15. National Research Council, 1990, Committee on Biological Effects of Ionizing Radiation (BEIR V), Board on Radiation Effects Research on Life Sciences, "The Effects of Exposure to Low Levels of Ionizing Radiation".

16. United States Nuclear Regulatory Commission, Regulatory Guide 4.1, "Programs for Monitoring Radioactivity in the Environs of Nuclear Power Plants," Revision 1, April 1975.

17. United States Nuclear Regulatory Com.mission, Regulatory Guide 4.13, "Performance, Testing and Procedural Specifications for Thermoluminescence Dosimetry: Environmental Applications, "Revision 1, July 1977.

18. United States Nuclear Regulatory Commission, Regulatory Guide 1.109, "Calculation of Annual Dose to Man from Routine Releases of Reactor Effluents for the Purpose of Evaluating Compliance with 10CFR Part 50, Appendix I, "Revision 1, October 1977..

19. United States Nuclear Regulatory Commission Branch Technical Position, "An Acceptable Radiological Environmental Monitoring Program," Revision 1, November 1979.

20. United States Nuclear Regulatory Commission, Regulatory Guide 4.15, "Quality Assurance for Radiological Monitoring Programs (Normal Operations) - Effluent Streams and the Environment," Revision 1, February 1979.

21. Technical Specifications, Clinton Power Station, Unit No. 1, Docket No.

50-461, Office of Nuclear Reactor Regulation, 1986. Facility Operating License Number NPF-62.

22. Clinton Power Station, Updated Safety Analysis Report.

23. Clinton Power Station, Unit 1, Off-Site Dose Calculation Manual.

24. United States Nuclear Regulatory Commission, NUREG-1302, "Offsite Dose Calculation Manual Guidance: Standard Radiological Effluent Controls for Boiling Water Reactors, Generic Letter 89-01, Supplement No. 1", April 1991.

APPENDIX A RADIOLOGICAL ENVIRONMENTAL MONITORING REPORT

SUMMARY

Intentionally left blank TABLE A-1 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANNUAL

SUMMARY

FOR THE CLINTON POWER STATION, 2022 NAME OF FACILITY: CLINTON POWER STATION DOCKET NUMBER: 50-461 LOCATION OF FACILITY: DEWITT COUNTY IL REPORTING PERIOD: 2022 INDICATOR CONTROL LOCATION WITH HIGHEST ANNUAL MEAN (M)

MEDIUM OR REQUIRED LOCATIONS LOCATION NUMBER OF PATHWAY SAMPLED TYPES OF NUMBER OF LOWER LIMIT MEAN(M) MEAN(M) MEAN (M) STATION# NONROUTINE (UNITOF ANALYSIS ANALYSIS OF DETECTION (F) (F) (Fl NAME REPORTED MEASUREMEN1) PERFORMED PERFORMED (LLD) RANGE RANGE RANGE DISTANCE AND DIRECTION MEASUREMENTS SURFACE WATER 1-131 (LOW LVL) 12 <LLD NA 0 (PCl!LITER)

H-3 16 2000 <LLD <LLD 0 GAMMA 47 MN-54 15 <LLD <LLD 0 CO-58 15 <LLD <LLD 0 FE-59 30 <LLD <LLD 0 CO-60 15 <LLD <LLD 0 ZN-65 30 <LLD <LLD 0 NB-95 15 <LLD <LLD 0

)> ZR-95 30 <LLD <LLD 0 I

CS-134 15 <LLD <LLD 0 CS-137 18 <LLD <LLD 0 BA-140 60 <LLD <LLD 0 LA-140 15 <LLD <LLD 0 CE-144 NA <LLD <LLD 0 DRINKING WATER GR-B 12 4 <LLD NA 0 (PCIILITER)

H-3 4 2000 <LLD NA 0 l-131 (LOW LVL) 12 <LLD NA 0 GAMMA 12 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 NB-95 15 <LLD NA 0 ZR-95 30 <LLD NA 0 CS-134 15 <LLD NA 0 CS-137 18 <LLD NA 0 BA-140 60 <LLD NA 0 LA-140 15 <LLD NA 0 CE-144 NA <LLD NA 0 (M) The Mean Values are calculated using the positive values. (F) FracUon of detectable measurement are indicated in parentheses.

TABLE A-1 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANNUAL

SUMMARY

FOR THE CLINTON POWER STATION, 2022 NAME OF FACILITY: CLINTON POWER STATION DOCKET NUMBER: 50-461 LOCATION OF FACILITY: DEWITT COUNTY IL REPORTING PERIOD: 2022 INDICATOR CONTROL LOCATION WITH HIGHEST ANNUAL MEAN (M)

MEDIUM OR REQUIRED LOCATIONS LOCATION NUMBER OF PATHWAY SAMPLED TYPES OF NUMBER OF LOWER LIMIT MEAN(M) MEAN{M) MEAN (M) STATION# NON ROUTINE (UNITOF ANALYSIS ANALYSIS OF DETECTION (Fl (F) {F) NAME REPORTED MEASUREMEN!). PERFORMED PERFORMED {LLD) RANGE RANGE RANGE DISTANCE AND DIRECTION MEASUREMENTS WELL WATER H-3 12 2000 <LLD NA 0 (PCVLITER)

GAMMA 12 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 NB-95 15 <LLD NA 0 l> ZR-95 30 <LLD NA 0 I

l\l CS-134 15 <LLD NA 0 CS-137 18 <LLD NA 0 BA-140 60 <LLD NA 0 LA-140 15 <LLD NA 0 CE-144 NA <LLD NA 0 FISH GAMMA 16 (PCI/KG WET) MN-54 130 <LLD <LLD 0 CO-58 130 <LLD <LLD 0 FE-59 260 <LLD <LLD 0 CO-60 130 <LLD <LLD 0 ZN-65 260 <LLD <LLD 0 NB-95 NA <LLD <LLD 0 ZR-95 NA <LLD <LLD 0 CS-134 130 <LLD <LLD 0 CS-137 150 <LLD <LLD 0 BA-140 NA <LLD <LLD 0 LA-140 NA <LLD <LLD 0 CE-144 NA <LLD <LLD 0 (M) The Mean Values are calculated using the positive values. (F) Fraction of detectable measurement are indicated in parentheses.

TABLE A-1 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANNUAL

SUMMARY

FOR THE CLINTON POWER STATION, 2022 NAME OF FACILITY: CLINTON POWER STATION DOCKET NUMBER: 50-461 LOCATION OF FACILITY: DEWITT COUNTY IL REPORTING PERIOD: 2022 INDICATOR CONTROL LOCATION WITH HIGHEST ANNUAL MEAN (M)

MEDIUM OR REQUIRED LOCATIONS LOCATION NUMBER OF PATHWAY SAMPLED TYPES OF NUMBER OF LOWER LIMIT MEAN(M) MEAN(M) MEAN(M) STATION# NONROUTINE (UNITOF ANALYSIS ANALYSIS OF DETECTION (F) (F) (F) NAME REPORTED MEASUREMEN!J. PERFORMED PERFORMED (LLD) RANGE RANGE RANGE DISTANCE AND DIRECTION MEASUREMENTS SEDIMENT GAMMA 4 (PCIIKG DRY) MN-54 NA <LLD <LLD 0 CO-58 NA <LLD <LLD 0 FE-59 NA <LLD <LLD 0 C0-60 NA <LLD <LLD 0 ZN-65 NA <LLD <LLD 0 NB-95 NA <LLD <LLD 0 ZR-95 NA <LLD <LLD 0 CS-134 150 <LLD <LLD 0 CS-137 180 <LLD <LLD 0 J> BA-140 NA <LLD <LLD 0 I

(,) LA-140 NA <LLD <LLD 0 CE-144 NA <LLD <LLD 0 AIR PARTICULATE GR-B 525 10 20 22 22 CL-11 CONTROL 0 (E-3 PC/ICU.METER) (473/473) (52/52) (52152) ILLINOIS POWER SUBSTATION 8-43 12 43 12-43 16 MILES S OF SITE GAMMA 40 CO-60 NA <LLD <LLD 0 NB-95 NA <LLD <LLD 0 ZR-95 NA <LLD <LLD 0 RU-103 'NA <LLD <LLD 0 RU-106 NA <LLD <LLD 0 CS-134 50 <LLD <UD 0 CS-137 60 <LLD <LLD 0 CE-141 NA <LLD <LLD . 0 CE-144 NA <LLD <LLD 0 AIR IODINE GAMMA 528 (E-3 PC/ICU.METER) /-131 70 <LLD <LLD 0 (M) The Mean Values are calculated using the positive values. (Fl Fraction of detectable measurement are indicated in parentheses.

TABLE A-1 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANNUAL

SUMMARY

FOR THE CLINTON POWER STATION, 2022 NAME OF FACILITY: CLINTON POWER STATION DOCKET NUMBER: 50-461 LOCATION OF FACILITY: DEWITT COUNTY IL REPORTING PERIOD: 2022 INDICATOR CONTROL LOCATION WITH HIGHEST ANNUAL MEAN (M)

MEDIUM OR REQUIRED LOCATIONS LOCATION NUMBER OF PATHWAY SAMPLED TYPES OF NUMBER OF LOWER LIMIT MEAN (M) MEAN(M) MEAN (M) STATION# NONROUTINE (UNJTOF ANALYSIS ANALYSIS OF DETECTION (F) (Fl (F) NAME REPORTED MEASUREMEN!l PERFORMED PERFORMED (LLD) RANGE RANGE RANGE DISTANCE AND DIRECTION MEASUREMENTS MILK 1*131 (LOW LVL) 19 NA <LLD 0 (PCIILITER)

GAMMA 19 K-40 NA NA 957 957 CL-116 CONTROL 0 (19/19) (19/19) . DEMENT DAIRY 635-1200 635- 1200 14 MILES WSW OF SITE MN-54 NA NA <LLD 0 C0-58 NA NA <LLD 0 FE-59 NA NA <LLD 0 CO-60 NA NA <LLD 0

)> ZN-65 NA NA <LLD 0 I

,:,. NB-95 <LLD NA NA 0 ZR-95 NA NA <LLD 0 CS-134 15 NA <LLD 0 CS-137 18 NA <LLD 0 BA-140 60 NA <LLD 0 LA-140 15 NA <LLD 0 CE-144 NA NA <LLD 0 VEGETATION GAMMA 36 (PCI/KG WE1J MN-54 NA <LLD <LLD 0 CO-58 NA <LLD <LLD 0 FE-59 NA <LLD <LLD 0 CO-60 NA <LLD <LLD 0 ZN-65 NA <LLD <LLD 0 NB-95 NA <LLD <LLD 0 ZR-95 NA <LLD <LLD 0 1-131 60 <LLD <LLD 0 CS-134 60 <LLD <LLD 0 CS-137 80 <LLD <LLD 0 BA-140 NA <LLD <LLD 0 LA-140 NA <LLD <LLD 0 CE-144 NA <LLD <LLD 0 (M) The Mean Values are calculated using the positive values. (F) Fraction of detectable measurement are indicated in parentheses.

TABLE A-1 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANNUAL

SUMMARY

FOR THE CLINTON POWER STATION, 2022 NAME OF FACILITY: CLINTON POWER STATION DOCKET NUMBER: 50-461 LOCATION OF FACILITY: DEWITT COUNTY IL REPORTING PERIOD: 2022 INDICATOR CONTROL LOCATION WITH HIGHEST ANNUAL MEAN (M)

MEDIUM OR REQUIRED LOCATIONS LOCATION NUMBER OF PATHWAY SAMPLED TYPES OF NUMBER OF LOWER LIMIT MEAN(M) MEAN(M) MEAN(M) STATION# NONROUTINE (UNITOF ANALYSIS ANALYSIS OF DETECTION (F) (F) (F) NAME REPORTED MEASUREMENT} PERFORMED PERFORMED {LLD) RANGE RANGE RANGE DISTANCE AND DIRECTION MEASUREMENTS GRASS GAMMA 52 (PCIIKG WE1J MN-54 NA <LLD <LLD 0 C0-58 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 ZR-95 NA <LLD <LLD 0

/-131 60 <LLD <LLD 0 CS-134 60 <LLD <LLD 0 l> CS-137 80 <LLD <LLD 0 I

(.J1 BA-140 NA <LLD <LLD 0 LA-140 NA <LLD <LLD 0 CE-144 NA <LLD <LLD 0 DIRECT RADIATION OSLD-QUARTERLY 215 NA 18.6 16.9 20.2 CL-49 INDICATOR 0 (MILLI-ROENTGENIQTR.) (211/211) (4/4) (4/4) 14.3-22.8 15.8 - 18.1 17.7 - 22. 1 3.5 MILESW (M) The Mean Values are calculated using the positive values. (F) Fraction of detectable measurement are indicated in parentheses.

Intentionally left blank APPENDIX B LOCATION DESIGNATION, DISTANCE & DIRECTION, AND SAMPLE COLLECTION & ANALYTICAL METHODS

Intentionally left blank TABLE B-1: Radiological Environmental Monitoring Program - Sampling Locations, Distance and Direction Clinton Power Station, 2022 Location Location Description Distance & Direction from Site A. Surface Water CL-13 Salt Creek Bridge on Rt. 1O (indicator) 3.6 miles SW CL-90 Discharge Flume (indicator) 0.4 miles SE CL-91 Parnell Boat Access (control) 6.1 miles ENE CL-99 North Fork Access (control) 3.5 miles NNE B. Drinking /Potable) Water CL-14 Station Plant Service Bldg (indicator) Onsite C. Well Water CL-7D Mascoutin Recreation Area (indicator) 2.3 miles ESE CL-12T DeWitt Pump House (indicator) 1.6 miles E CL-12R DeWitt Pump House (indicator) 1.6 miles E D. Milk - bi-weekly/ monthly CL-116 Dement Dairy (control) 14 miles WSW E. Air Particulates / Air Iodine CL-1 Camp Quest 1.8 miles W CL-2 Clinton's Main Access Road 0.7 miles NNE CL-3 _Clinton's Secondary Access Road 0.7 miles NE CL-4 Residence Near Recreation Area 0.8 miles SW CL-6 Clinton's Recreation Area 0.7 miles WSW CL-7 Mascoutin Recreation Area 2.3 miles SE CL-8 DeWitt Cemetery 2.2 miles E CL-11 Illinois Power Substation (control) 16 miles S CL-15 Rt. 900N Residence 0.9 miles N CL-94 Old Clinton Road 0.6 miles E F. Fish CL-19 End of Discharge Flume (indicator) 3.4 miles E CL-105 Lake Shelbyville (control) 50 miles S G. Shoreline Sediment CL-7B Clinton Lake (indicator) 2.1 miles SE CL-105 Lake Shelbyville (control) 50 miles S H. Food Products CL-114 Residence WSW of Site (control) 12.5 miles WSW CL-115 Site's Secondary Access Road 0.7 miles NE CL-118 Site's Main Access Road 0.7 miles NNE I. Grass CL-1 Camp Quest 1.8 miles W CL-2 Clinton's Main Access Road 0.7 miles NNE CL-8 DeWitt Cemetery 2.2 miles E CL-116 Pasture in Rural Kenney (control) 14 miles WSW B-1

TABLE B-1: Radiological Environmental Monitoring Program - Sampling Locations, Distance and Direction Clinton Power Station, 2022 .

Location Location Description Distance & Direction from Site J. Environmental Dosimet!Y - DLR Inner Ring CL-1 1.8 miles W CL-5 0.7 miles NNE CL-22 0.6 miles NE CL-23 0.5 miles ENE CL-24 0.5 miles E CL-34 0.8milesWNW CL-35 0.7miles NW CL-36 0.6 miles N CL-42 2.8 miles ESE CL-43 2.8 miles SE CL-44 2.3 miles SSE CL-45 2.8 miles S CL-46 2.8 miles SSW CL-47 3.3 miles SW CL-48 2.3 miles WSW CL-63 1.3 miles NNW Outer Ring CL-51 4.4miles NW CL-52 4.3 miles NNW CL-53 4.3 miles E CL-54 4.6 miles ESE CL-55 4.1 miles SE CL-56 4.1 miles SSE CL-57 4.6 miles S CL-58 4.3 miles SSW CL-60 4.5 miles SW CL-61 4.5milesWSW CL-76 4.6 miles N CL-77 4.5 miles NNE CL-78 4.8 miles NE CL-79 4.5 miles ENE CL-80 4.1 milesW CL-81 4.5milesWNW Special Interest CL-37 3.4 miles N CL-41 2.4 miles E CL-49 3.5 milesW CL-64 2.1 miles WNW CL-65 2.6 miles ENE CL-74 1.9 miles W CL-75 0.9 miles N B-2

TABLE B-1: Radiological Environmental Monitoring Program - Sampling Locations, Distance and Direction Clinton Power Station, 2022 Location Location Description Distance & Direction from Site J. Environmental Dosimet[Y - DLR (cont'd)

Supplemental CL-2 0.7 miles NNE CL-3 0.7 miles NE CL-4 0.8 miles SW CL-6 0.8 miles WSW CL-7 2.3 miles SE CL-8 2.2 miles E CL-15 0.9 miles N CL-33 11.7 miles SW CL-84 0.6 miles E CL-90 0.4 miles SE CL-91 6.1 miles ENE CL-97 10.3 miles SW CL-99 3.5 miles NNE CL-114 12.5 miles WSW Control CL-11 16 miles S B-3

TABLE 8-2: Radiological Environmental Monitoring Program - Summary of Sample Collection and Analytical Methods, Clinton Power Station, 2022 Sample Analysis Sampling Method Ani3lytical Procedure Number Medium Monthly grab and; composite TBE, TBE-2007 Gamma-Emitting Radioisotope Analysis Surface Gamma from a continuous water Water Spectroscopy Env. Inc., SPM-1 Sampling Procedure Manual compositor Surface Quarterly composite from a TBE, TBE-2011 Tritium Analysis in Drinking Water by Liquid Scintillation Tritium Water continuous water compositor Env. Inc., SPM-1 Sampling Procedure Manual Surface Monthly composite from a TBE, TBE-2012 Radioiodine in Various Matrices 1-131 Water continuous water compositor Env. Inc., SPM-1 Sampling Procedure Manual TBE, TBE-2008 Gross Alpha and/or Gross Beta Activity in Various Drinking Monthly composite from a Matrices Gross Beta Water continuous water compositor Env. Inc., SPM-1 Sampling Procedure Manual Drinking Gamma Month,ly composite from a TBE, TBE-2007 Gamma-Emitting Radioisotope Analysis Water Spectroscopy continuous water compositor Env. Inc., SPM-1 Sampling Procedure Manual Drinking Quarterly composite from a TBE, TBE-2011 Tritium Analysis in Drinking Water by Liquid Scintillation Tritium Water continuous water compositor Env. Inc., SPM-1 Sampling Procedure Manual Drinking Monthly composite from a TBE, TBE-2012 Radioiodine in Various Matrices 1-131 Water continuous water compositor Env. Inc., SPM-1 Sampling Procedure Manual Gamma Quarterly composite from a TBE, TBE-2007 Gamma-Emitting Radioisotope Analysis Well Water Spectroscopy continuous water compositor Env. Inc., SPM-1 Sampling Procedure Manual Quarterly composite from a TBE, TBE-2011 Tritium Analysis in Drinking water by Liquid Scintillation Well Water Tritium continuous water compositor Env. Inc., SPM-1 Sampling Procedure Manual Semi-annual samples TBE-2007 Gamma-Emitting Radioisotope Analysis Gamma Fish collected via electroshocking Spectroscopy Env. Inc., SPM-1 Sampling Procedure Manual or other techniques Gamma TBE, TBE-2007 Gamma-Emitting Radioisotope Analysis Sediment Semi-annual grab samples Spectroscopy Env. Inc., SPM-1 Sampling Procedure Manual One-week composite of TBE, TBE-2008 Gross Alpha and/or Gross Beta Activity in Various Air Matrices Gross Beta continuous air sampling Particulates through glass fiber filter paper Env. Inc., SPM-1 Sampling Procedure Manual Air Gamma Quarterly composite of each TBE, TBE-2007 Gamma-Emitting Radioisotope Analysis Particulates Spectroscopy station Env. Inc., SPM-1 Sampling Procedure Manual One-week composite of TBE, TBE-2007 Gamma-Emitting Radioisotope Analysis Gamma Air Iodine continuous air sampling Spectroscopy Env. Inc., SPM-1 Sampling Procedure Manual through charcoal filter Bi-weekly grab sample when TBE, TBE-2012 Radioiodine in Various Matrices Milk 1-131 cows are on pasture.

Monthly all other times Env. Inc., SPM-1 Sampling Procedure Manual Bi-weekly grab sample when TBE-2007 Gamma-Emitting Radioisotope Analysis Gamma Milk cows are on pasture.

Spectroscopy Env. Inc., SPM-1 Sampling Procedure Manual Monthly all other times TBE. TBE-2008 Gross Alpha and/or Gross Beta Activity in Various Food Monthly grab Matrices Gross Beta Products June through September Env. Inc., SPM-1 Sampling Procedure Manual Food Gamma Monthly grab TBE, TBE-2007 Gamma-Emitting Radioisotopes Analysis Products Spectroscopy June through September Env. Inc., SPM-1 Sampling Procedure Manual Gamma Biweekly TBE, TBE-2007 Gamma-Emitting Radioisotopes Analysis Grass Spectroscopy May through October Env. Inc., SPM-1 Sampling Procedure Manual Thermo- Quarterly DLRs comprised DLR Luminescence of two A'20a:C Landauer Landauer Incorporated Dosimetry Incorporated elements B-4

CLINTON LAKE Figure B-1 Environmental Sampling Locations Within One Mile of the Clinton Power Station, 2022 B-5

ILL RT 54 Figure B-2 Environmental Sampling Locations Between One and Two Miles of the Clinton Power Station, 2022 B-6

Figure B-3 Environmental Sampling Locations Between Two and Five Miles of the Clinton Power Station, 201 O B-7

r -

I Figure B-4 Environmental Sampling Locations Greater Than Five Miles of the Clinton Power Station, 2022 B-8

APPENDIXC DATA TABLES AND FIGURES

Intentionally left blank Table C-1.1 CONCENTRATIONS OF I-131 IN SURFACE WATER SAMPLES COLLECTED IN THE VICINITY OF CLINTON POWER STATION, 2022 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION PERIOD CL-90 12/29/21 - 01/26/22 < 0.4 01 /26/22 - 02/23/22 < 0.9 02/23/22 - 03/30/22 < 0.8 03/30/22 - 04/27/22 < 1.0 04/27/22 - 05/25/22 <- 0.6 05/25/22 - 06/29/22 < 0.8 06/29/22 - 07127122 < 0.9 07/27/22 - 08/31/22 < 0.9 08/31 /22 - 09/2 8/22 < 0.7 09/28/22 - 10/26/22 < 0.8 10/26/22 - 11 /30/22 < 0.6 11 /30/22 - 12/28/22 < 0.9 MEAN Table C-1.2 CONCENTRATIONS OF TRITIUM IN SURFACE WATER SAMPLES COLLECTED IN THE VICINITY OF CLINTON POWER STATION, 2022 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION PERIOD CL-90 CL-13 CL-91 CL-99 12/29/21 - 03/30/22 < 195 < 181 < 185 < 170 03/30/22 - 06/29/22 < 184 < 187 < 168 < 167 06/29/22 - 09/28/22 < 199 < 191 < 190 < 194 09/28/22 - 12/28/22 < 181 < 188 < 180 < 180 MEAN C-1

Table C-1.3 CONCENTRATIONS OF GAMMA EMITTERS IN SURFACE WATER SAMPLES COLLECTED IN THE VICINITY OF CLINTON POWER STATION, 2022 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION SITE PERIOD Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 Cs-134 Cs-137 Ba-140 La-140 Ce-144 CL-13 01/26/22 - 01/26/22 <5 < 5 < 7 < 6 < 11 < 5 < 8 <5 <4 < 15 <7 < 31 02/23/22 - 02/23/22 <7 <5 < 11 <9 < 14 < 6 < 11 <7 < 7 < 31 < 6 < 39 03/30/22 - 03/30/22 < 6 <7 < 9 < 10 < 10 < 5 < 14 < 8 < 8 < 31 < 12 < 43 04/27/22 - 04/27/22 <4 <4 < 8 <4 < 7 < 5 < 7 < 5 < 4 < 17 < 6 < 32 05/25/22 - 05/25/22 < 5 < 5 < 11 < 6 < 11 < 6 < 8 < 6 < 6 < 23 < 8 < 34 06/29/22 - 06/29/22 <7 < 8 < 14 <8 < 16 < 7 < 14 < 7 < 6 < 35 < 12 < 35 07/27/22 - 07/27/22 < 6 <4 < 12 < 6 < 13 < 5 < 10 < 5 < 5 < 24 < 8 < 34 08/31/22 - 08/31/22 <5 <8 < 11 < 9 < 13 < 8 < 12 < 7 < 6 < 35 < 13 < 42 09/28/22 - 09/28/22 <7 <7 < 11 < 10 < 16 < 8 < 9 < 9 <7 < 29 < 12 < 44 10/26/22 - 10/26/22 <7 < 6 < 15 <6 < 14 < 7 < 11 < 6 < 6 < 25 <7 < 45 11/30/22 - 11/30/22 <4 <5 < 8 <4 <8 < 5 < 7 <4 <4 < 19 <7 < 31 12/28/22 - 12/28/22 (1)

C) MEAN I

N CL-90 12/29/21 - 01/26/22 <4 <4 < 7 <4 <8 <4 < 8 <5 < 5 < 16 < 3 < 27 01/26/22 - 02/23/22 < 5 < 6 < 13 <7 < 15 < 8 < 11 < 6 < 6 < 30 < 9 < 48 02/23/22 - 03/30/22 <6 < 6 < 9 < 6 < 14 < 6 < 11 <7 < 6 < 32 < 14 < 50 03/30/22 - 04/27/22 <4 < 5 < 12 <'5 < 11 < 5 < 9 < 5 <5 < 20 < 6 < 30 04/27/22 - 05/25/22 < 5 < 8 < 12 <7 < 13 < 7 < 9 < 6 < 6 < 27 < 9 < 40 05/25/22 - 06/29/22 < 6 <5 < 14 < 6 < 14 < 5 < 11 < 7 < 7 < 34 < 9 < 50 06/29/22 - 07/27/22 < 5 <4 < 9 <5 < 10 < 6 < 11 < 6 < 5 < 24 < 9 < 36 07127122 - 08/31 /22 < 5 < 6 < 10 < 6 < 11 < 5 < 10 < 5 <5 < 26 < 10 < 42 08/31 /22 - 09/28/22 < 7 < 6 < 12 < 8 < 13 < 6 < 12 < 7 < 6 < 35 < 8 < 38 09/28/22 - 10/26/22 < 6 < 6 < 12 < 6 < 12 < 5 < 8 < 6 < 5 < 27 < 6 < 47 10/26/22 - 11 /30/22 < 5 <5 < 10 < 6 < 12 < 5 < 7 < 5 < 4 < 23 < 8 < 37 11 /30/22 - 12/28/22 < 7 < 6 < 16 <7 < 15 < 8 < 11 < 9 <7 < 41 < 9 < 52 MEAN (1) SEE PROGRAM EXCEPTIONS SECTION FOR EXPLANATION

Table C-1.3 CONCENTRATIONS OF GAMMA EMITTERS IN SURFACE WATER SAMPLES COLLECTED IN THE VICINITY OF CLINTON POWER STATION, 2022 RES ULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION SITE PERIOD Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 Cs-134 Cs-137 Ba-140 La-140 Ce-144 CL-91 12/29/21 - 01/26/22 < 5 < 4 <9 <5 < 11 < 5 < 8 < 5 <5 < 16 < 5 < 35 01 /26/22 - 02/23/22 < 6 < 6 < 10 <5 < 10 < 5 < 10 < 4 <5 < 25 < 9 < 34 02/23/22 - 03/30/22 < 7 < 7 < 14 < 5 < 13 < 7 < 12 < 7 < 6 < 37 < 14 < 60 03/30/22 - 04/27/22 < 5 < 4 < 10 < 4 < 8 < 5 < 7 < 5 < 5 < 19 < 6 < 41 04/27122 - 05/25/22 < 6 < 7 < 12 < 8 < 13 < 6 < 10 < 8 < 7 < 32 < 13 < 43 05/25/22 - 06/29/22 < 5 < 6 < 12 < 5 < 15 < 6 < 11 < 9 < 5 < 30 < 12 < 53 06/29/22 - 07/27/22 < 6 < 6 < 12 < 8 < 14 < 6 < 9 < 5 < 6 < 26 < 13 < 36 07127122 - 08/31/22 < 5 < 6 < 12 < 7 < 10 < 6 < 9 < 5 < 5 < 28 < 11 < 40 08/31 /22 - 09/28/22 < 5 < 4 < 13 < 5 < 11 < 6 < 10 < 6 < 6 < 25 < 6 < 50 09/28/22 - 10/26/22 < 5 < 5 < 11 < 6 < 14 < 7 < 11 < 6 < 6 < 28 < 9 < 41 10/26/22 - 11 /30/22 < 4 < 4 < 11 < 6 < 8 < 5 < 7 < 4 < 5 < 26 < 9 < 32 11 /30/22 - 12/28/22 <7 < 7 < 14 <7 < 16 < 8 < 11 < 7 <7 < 34 < 11 < 54 0I MEAN Ci)

CL-99 12/29/21 - 01/26/22 <4 < 4 < 8 < 5 < 7 < 5 < 7 < 4 <5 < 18 < 6 < 28 01/26/22 - 02/23/22 <5 < 5 < 11 < 6 < 10 < 5 < 9 < 5 <5 < 30 < 9 < 41 02/23/22 - 03/30/22 <5 < 5 < 9 < 4 < 12 < 5 < 8 < 5 <5 < 21 < 7 < 32 03/30/22 - 04/27/22 <5 < 4 < 8 < 4 < 10 < 5 < 9 < 4 < 6 < 20 < 7 < 34 04/27122 - 05/25/22 < 6 < 6 < 13 < 7 < 11 < 7 < 10 < 6 < 5 < 33 < 13 < 37 06/29/22 - 06/29/22 < 6 < 5 < 10 < 7 < 13 < 6 < 9 < 7 < 5 < 30 < 11 < 46 07/27/22 - 07/27/22 < 5 < 5 < 12 < 6 < 13 < 5 < 9 < 6 < 5 < 27 < 9 < 30 08/31/22 - 08/31/22 < 5 < 5 < 9 < 6 < 10 < 5 < 9 < 6 < 5 < 24 < 7 < 33 08/31 /22 - 09/28/22 < 7 < 8 < 15 < 9 < 12 < 5 < 12 < 6 <8 < 30 < 12 < 43 10/26/22 - 10/26/22 <5 < 4 < 10 <8 < 13 < 8 < 14 < 6 <7 < 22 < 12 < 36 11 /30/22 - 11 /30/22 < 6 .< 7 < 14 <7 < 13 < 7 < 13 < 7 < 6 < 35 < 8 < 51 12/14/22 - 12/28/22 <7 < 7 < 16 <9 < 12 < 9 < 10 < 6 < 6 < 33 < 9 < 47 MEAN

Table C-I1.1 CONCENTRATIONS OF GROSS BETA IN DRINKING WATER SAMPLES COLLECTED IN THE VICINITY OF CLINTON POWER STATION, 2022 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION PERIOD CL-14 12/29/21 - 01/26/22 < 1.6 01 /26/22 - 02/23/22 < 1.5 02/23/22 - 03/30/22 < 1.4 03/30/22 - 04/27/22 < 1.3 04/27 /22 - 05/25/22 < 1.7 05/25/22 - 06/29/22 < 1.7 06/29/22 - 07/27/22 < 1.3 07/27/22 - 08/31/22 < 1.6 08/31 /22 - 09/28/22 < 1.7 09/28/22 - 10/26/22 < 1.9 10/26/22 - 11 /30/22 < 1.7 11 /30/22 - 12/28/22 < 1.5 MEAN Table C-I1.2 CONCENTRATIONS OF TRITIUM IN DRINKING WATER SAMPLES COLLECTED IN THE VICINITY OF CLINTON POWER STATION, 2022 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION PERIOD CL-14 12/29/21 - 03/30/22 < 171 03/30/22 - 06/29/22 < 184 06/29/22 - 09/28/22 < 183 09/28/22 - 12/28/22 < 181 MEAN Table C-I1.3 CONCENTRATIONS OF 1-131 IN DRINKING WATER SAMPLES COLLECTED IN THE VICINITY OF CLINTON POWER STATION, 2022 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION PERIOD CL-14 12/29/21 - 01/26/22 < 0.5 01 /26/22 - 02/23/22 < 0.8 02/23/22 - 03/30/22 < 0.6 03/30/22 - 04/27/22 < 0.9 04/27/22 - 05/25/22 < 0.9 05/25/22 - 06/29/22 < 0.8 06/29/22 - 07127122 < 0.7 07/27/22 - 08/31/22 < 0.9 08/31 /22 - 09/28/22 < 0.9 09/28/22 - 10/26/22 < 0.8 10/26/22 - 11 /30/22 < 0.6 11 /30/22 - 12/28/22 < 0.8 MEAN C-4

Table C-11.4 CONCENTRATIONS OF GAMMA EMITTERS IN DRINKING WATER SAMPLES COLLECTED IN THE VICINITY OF CLINTON POWER STATION, 2022 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION SITE PERIOD Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 Cs-134 Cs-137 Ba-140 La-140 Ce-144 CL-14 12/29/21 - 01/26/22 <4 <4 < 8 < 5 <9 < 5 < 7 < 5 < 5 < 16 <5 < 30 01/26/22 - 02/23/22 < 5 <6 < 10 < 6 < 13 < 8 < 10 < 7 < 6 < 27 <8 < 39 02/23/22 - 03/30/22 < 6 <7 < 10 < 6 < 14 < 7 < 8 < 5 < 5 < 30 <9 < 44 03/30/22 - 04/27/22 < 4 <4 < 9 < 5 < 10 <4 < 7 < 4 < 3 < 19 < 5 < 31 04/27/22 - 05/25/22 < 5 <6 < 11 < 6 < 9 < 6 < 10 < 6 <7 < 34 < 9 < 49 05/25/22 - 06/29/22 < 6 <5 < 18 < 8 < 12 < 8 < 12 < 7 < 9 < 37 < 12 < 40 06/29/22 - 07/27/22 <4 <4 < 10 < 6 < 11 < 4 < 7 < 6 < 5 < 23 < 9 < 35 07/27/22 - 08/31/22 < 6 <7 < 12 < 7 < 13 < 6 < 10 < 7 < 7 < 28 < 13 < 42 08/31/22 - 09/28/22 < 6 <7 < 14 < 8 < 11 < 5 < 12 < 7 < 7 < 36 < 9 < 51 09/28/22 - 10/26/22 < 6 <6 < 13 < 6 < 10 < 6 < 7 < 5 < 7 < 30 <4 < 38 10/26/22 - 11/30/22 < 4 <4 < 10 < 6 < 9 < 5 < 9 < 6 < 5 < 28 < 8 < 39 11/30/22 - 12/28/22 < 7 <8 < 14 < 8 < 17 <7 < 10 < 9 < 9 < 35 < 14 < 52 C') MEAN I

u,

Table C-111.1 CONCENTRATIONS OF TRITIUM IN WELL WATER SAMPLES COLLECTED IN THE VICINITY OF CLINTON POWER STATION, 2022 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION PERIOD CL-070 CL-12R CL-12T 03/30/22 03/30/22 < 181 < 198 < 192 06/29/22 06/29/22 < 185 < 183 < 178 09/28/22 - 09/28/22 < 192 < 199 < 191 12/28/22 - 12/28/22 < 170 < 167 < 182 MEAN C-6

Table C-111.2 CONCENTRATIONS OF GAMMA EMITTERS IN WELL WATER SAMPLES COLLECTED IN THE VICINITY OF CLINTON POWER STATION, 2022 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION SITE PERIOD Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 Cs-134 Cs-137 Ba-140 La-140 Ce-144 CL-07D 03/30/22 < 7 < 7 < 13 < 6 < 15 < 7 < 9 < 7 < 5 < 33 < 14 < 40 06/29/22 < 7 < 6 < 15 < 7 < 12 < 7 < 12 < 7 < 7 < 32 < 11 < 36 09/28/22 < 8 < 9 < 16 < 10 < 11 < 6 < 12 < 6 < 8 < 31 < 14 < 40 12/28/22 < 8 < 8 < 15 < 8 < 14 < 7 < 10 < 7 < 10 < 35 < 7 < 40 MEAN CL-12R 03/30/22 < 8 < 7 < 13 < 8 < 14 < 8 < 10 < 8 < 8 < 36 < 13 < 41 06/29/22 < 5 < 5 < 16 < 8 < 6 < 5 < 14 < 7 < 6 < 37 < 9 < 47 09/28/22 < 7 < 8 < 12 < 8 < 13 < 7 < 12 < 8 < 6 < 34 < 12 < 51 12/28/22 < 7 < 7 < 13 < 7 < 13 < 8 < 10 < 7 < 6 < 27 < 6 < 47 MEAN C)

I CL-12T 03/30/22 < 7 <8 < 18 < 7 < 13 < 8 < 15 < 8 < 7 < 30 < 12 < 48 06/29/22 < 7 <5 < 13 <7 < 13 < 5 < 13 < 8 < 5 < 32 < 11 < 32 09/28/22 < 8 <7 < 15 < 8 < 17 < 8 < 13 < 9 < 7 < 27 < 11 < 43 12/28/22 < 6 <7 < 14 <6 < 14 < 6 < 13 < 5 < 6 < 33 < 11 < 48 MEAN

Table C-IV.1 CONCENTRATIONS OF GAMMA EMITTERS IN FISH SAMPLES COLLECTEC IN THE VICINITY OF CLINTON POWER STATION, 2022 RES ULTS IN UNITS OF PCI/KG WET+/- 2 SIGMA COLLECTION SITE PERIOD Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 Cs-134 Cs-137 Ba-140 La-140 Ce-144 CL-19 Largemouth Bass 05/02/22 < 77 < 71 < 195 < 92 < 161 <: 74 < 111 < 86 < 74 < 302 < 124 < 327 Channel Catfish 05/02122 < 75 < 83 < 146 < 80 < 145 < 77 < 117 < 92 < 78 < 307 < 96 < 427 Bluegill 05/02122 < 78 < 46 < 145 < 79 < 129 < 77 < 114 < 80 < 85 < 299 < 49 < 295 Garp 05/02/22 < 73 < 74 < 137 < 59 < 150 < 74 < 120 < 60 < 84 < 313 < 104 < 379 Largemouth Bass 09/29/22 < 79 < 68 < 149 < 47 < 143 < 78 < 106 < 83 < 61 < 389 < 81 < 427 Channel Catfish 09/29/22 < 66 < 92 < 186 < 98 < 144 < 71 < 157 < 86 < 67 < 317 < 121 < 347 Bluegill 09/29/22 < 61 < 56 < 127 < 57 < 123 < 70 < 102 < 65 < 59 < 243 < 89 < 338 Carp 09/29/22 < 54 < 52 < 109 < 61 < 115 < 66 < 97 < 72 < 62 < 277 < 87 < 314 MEAN CL-105 Largemouth Bass 04/27/22 < 61 < 52 < 94 < 57 < 108 < 50 < 87 < 59 < 50 < 259 < 66 < 283 White Crappie 04/27/22 < 47 < 45 < 98 < 34 < 103 < 37 < 96 < 59 < 42 < 289 < 75 < 256 0I 0:,

Bluegill 04/27/22 < 70 < 61 < 151 < 79 < 146 < 69 < 99 < 90 < 56 < 321 < 85 < 302 Carp 04/27/22 < 55 < 57 < 104 < 55 < 150 < 56 < 96 < 69 < 55 < 335 < 98 < 306 Largemouth Bass 09/29/22 < 78 < 55 < 114 < 78 < 106 < 62 < 106 < 69 < 56 < 281 < 82 < 222 White Crappie/White Bass 09/29/22 < 51 < 73 < 165 < 62 < 144 < 52 < 104 < 68 < 54 < 208 < 125 < 240 Bluegill 09/29/22 < 67 < 61 < 185 < 75 < 131 < 64 < 102 < 77 < 71 < 295 < 116 < 335 Carp 09/29/22 < 42 < 59 < 142 < 53 < 123 < 56 < 69 < 51 < 59 < 200 < 58 < 264 MEAN

Table C-V.1 CONCENTRATIONS OF GAMMA EMITTERS IN SEDIMENT SAMPLES COLLECTED IN THE VICINITY OF CLINTON POWER STATION, 2022 RES ULTS IN UNITS OF PCI/KG WET+/- 2 SIGMA COLLECTION SITE PERIOD Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 Cs-134 Cs-137 Ba-140 La-140 Ce-144 CL-078 05/02/22 < 44 < 30 < 79 < 48 < 92 < 45 < 67 < 52 < 42 < 191 < 50 < 174 09/29/22 < 43 < 36 < 83 < 42 < 137 < 40 < 80 < 47 < 38 < 176 <66 <208 MEAN CL-105 04/27/22 < 40 < 37 < 91 < 47 < 97 < 44 < 75 < 48 < 37 < 244 < 68 < 208 09/29/22 < 53 < 53 < 104 < 49 < 134 < 58 < 97 < 52 < 55 < 252 < 81 < 270 MEAN C')

co

Table C-Vl.1 CONCENTRATIONS OF GROSS BETA IN AIR PARTICULATE SAMPLES COLLECTED IN THE VICINITY OF CLINTON POWER STATION, 2022 RESULTS IN UNITS OF E-3 PCI/CU METER+/- 2 SIGMA COLLECTION GROUP I PERIOD CL-2 CL-3 CL-4 CL-6 CL-15 CL-94 12/2 9/21 - 01 /05/22 31 +/-5 34 +/- 6 32 +/-5 (1) 37 +/- 6 43 +/-6 01/05/22 - 01/12/22 30 +/- 5 29 +/- 5 29 +/- 5 34 +/- 4 27 +/- 5 28 +/-5 01/12/22 - 01/19/22 22 +/- 5 25 +/- 5 23 +/-5 22 +/- 5 25 +/- 5 24 +/-5 01/19/22

01/26/22 22 +/- 5 25 +/- 5 25 +/-5 26 +/- 5 22 +/- 5 23 +/-5 01 /26/22 - 02/02/22 32 +/- 5 29 +/- 5 30 +/- 5 30 +/- 5 26 +/- 5 28 +/- 5 02/02/22 02/09/22 24 +/-5 29 +/- 5 28 +/- 5 31 +/- 5 31 +/- 5 22 +/-4 02/09/22

02/16/22 13 +/- 5 18 +/- 5 18 +/- 5 15 +/- 5 18 +/- 5 15 +/-5 02/16/22 02/23/22 11 +/- 5 13 +/- 5 13 +/- 5 12 +/- 5 15 +/- 5 14 +/- 5 02/23/22 - 03/02/22 19 +/- 5 19 +/- 5 23 +/- 5 19 +/- 5 21 +/- 5 21 +/-5 03/02/22 - 03/09/22 22 +/- 4 27 +/-5 20 +/-4 21 +/- 5 23 +/- 5 22 +/-5 03/09/22 - 03/16/22 21 +/- 5 16 +/-5 19 +/-5 19 +/- 5 18 +/- 5 17 +/-5 03/16/22

03/23/22 16 +/- 5 17 +/- 5 17 +/- 4 15 +/- 4 17 +/- 4 14 +/-4 03/23/22 - 03/30/22 11 +/-4 12 +/-4 10 +/-4 11 +/- 4 12 +/- 4 13 +/-4 03/30/22 04/06/22 10 +/-4 10 +/-4 10 +/-4 10 +/- 4 14 +/- 4 9 +/-4 04/06/22 - 04/13/22 12 +/-4 10 +/- 3 15 +/-4 13 +/- 4 13 +/- 4 17 +/-4 04/13/22 04/20/22 10 +/-4 13 +/-4 16 +/-4 21 +/- 4 20 +/- 4 15 +/-4 04/20/22 04/27/22 16 +/-4 18 +/-4 14 +/-4 15 +/- 4 19 +/- 4 14 +/-4 04/27/22 - 05/04/22 14 +/-4 19 +/-5 15 +/-4 17 +/- 5 11 +/- 4 15 +/-4 05/04/22 - 05/ 11122 14 +/-4 12 +/-4 10 +/-4 15 +/- 4 15 +/- 4 11 +/-4 05/11 /22 - 05/18/22 20 +/-5 23 +/-5 20 +/- 5 20 +/- 5 17 +/- 4 22 +/-5 05/18/22 05/25/22 19 +/-5 17 +/-4 19 +/-5 14 +/- 4 13 +/- 4 16 +/-4 05/25/22 - 06/01/22 15 +/-4 16 +/- 4 16 +/-4 17 +/- 4 12 +/- 4 14 +/-4 06/01/22 - 06/08/22 19 +/-4 19 +/-4 21 +/-5 20 +/- 5 19 +/- 4 21 +/- 5 06/08/22 06/15/22 19 +/-5 19 +/- 5 20 +/- 5 22 +/- 5 21 +/- 5 20 +/-5 06/15/22 06/22/22 14 +/-4 12 +/-4 15 +/- 4 20 +/- 5 12 +/- 4 14 +/-4 06/22/22 - 06/29/22 13 +/-4 12 +/-4 12 +/-4 12 +/- 4 10 +/- 4 12 +/-4 06/29/22 - 07/06/22 20 +/-4 19 +/-4 17 +/- 4 18 +/- 4 17 +/- 4 21 +/-4 07/06/22 - 07113/22 13 +/-4 13 +/- 4 10 +/-4 12 +/- 4 9+/-4 11 +/-4 07/13/22 - 07/20/22 24 +/- 5 23 +/- 5 26 +/- 5 22 +/- 5 23 +/- 5 24 +/- 5 07/20122 - 07/27/22 20 +/- 5 24 +/-5 20 +/- 5 24 +/- 5 17 +/- 4 21 +/-5 07/27/22

08/03/22 15 +/-4 11 +/-4 14 +/- 4 12 +/- 4 13 +/- 4 18 +/- 5 08/03/22

08/10/22 15 +/-4 13 +/- 3 16 +/- 4 11 +/- 3 8+/-3 16 +/-4 08/10/22

08/17/22 18 +/-4 23 +/- 5 23 +/- 5 21 +/- 4 17 +/- 4 23 +/- 5 08/17/22 - 08/24/22 17 +/-4 15 +/-4 14 +/- 4 (1) 15 +/- 4 12 +/-4 08/24/22 - 08/31 /22 22 +/-4 22 +/-4 23 +/-4 22 +/- 4 23 +/- 5 25 +/- 5 08/31/22 - 09/07/22 20 +/-5 21 +/-5 21 +/- 5 22 +/- 5 16 +/- 4 18 +/-4 09/07/22 - 09/14/22 22 +/-4 23 +/-5 23 +/- 5 18 +/- 4 21 +/- 4 19 +/-4 09/14/22 - 09/21/22 24 +/- 5 25 +/- 5 22 +/- 5 25 +/- 5 21 +/- 4 26 +/-5 09/21 /22 - 09/28/22 15 +/-4 17 +/-4 16 +/-4 16 +/- 4 17 +/- 4 15 +/-4 09/28/22 10/05/22 . 12 +/-4 17 +/-4 15 +/-4 14 +/- 4 14 +/- 4 18 +/-4 10/05/22 10/12/22 22 +/-4 25 +/- 5 25 +/- 5 24 +/- 5 26 +/- 5 26 +/- 5 10/12/22 - 10/19/22 12 +/-4 14 +/-4 11 +/- 3 16 +/- 4 11 +/- 4 13 +/-4 10/19/22 - 10/26/22 26 +/-5 32 +/-5 24 +/-5 26 +/- 5 24 +/- 5 29 +/-5 10/26/22 - 11 /02/22 21 +/-4 27 +/-5 28 +/-5 28 +/- 5 26 +/- 5 29 +/-5 11 /02/22 - 11 /09/22 27 +/- 5 28 +/-5 29 +/-5 28 +/- 5 27 +/- 5 28 +/-5 11/09/22 - 11/16/22 14 +/-4 17 +/-4 14 +/-4 14 +/- 4 15 +/- 4 24 +/-5 11/16/22 - 11/23/22 25 +/- 5 25 +/-5 30 +/- 5 27 +/- 5 25 +/- 5 28 +/-5 11/23/22 - 11/30/22 34 +/-5 37 +/-5 38 +/-5 37 +/- 5 37 +/- 5 43 +/-6 11/30/22 12/07/22 24 +/-4 32 +/-5 36 +/-5 28 +/- 5 28 +/- 5 34 +/-5 12/07/22 - 12/14/22 27 +/-5 31 +/-5 32 +/- 5 29 +/- 5 31 +/- 5 36 +/-5 12/14/22 - 12/21/22 22 +/-4 27 +/-5 26 +/-5 28 +/- 5 27 +/- 5 30 +/- 5 12/21/22 - 12/28/22 27 +/-5 27 +/-5 28 +/-5 29 +/- 5 28 +/- 5 33 +/- 5 12/28/22 - 01/04/23 30 +/- 5 24 +/-4 30 +/-5 25 +/- 5 25 +/- 5 33 +/-5 MEAN +/- 2 STD DEV 19 +/- 12 21 +/- 14 21 +/- 14 20 +/- 13 20 +/- 14 21 +/- 16 THE MEAN AND 7WO STANDARD DEVIATION ARE CALCULATED USING THE POSITIVE VALUES (1) SEE PROGRAM EXCEPTIONS SECTION FOR EXPLANATION C-10

Table C-Vl.1 CONCENTRATIONS OF GROSS BETA IN AIR PARTICULATE SAMPLES COLLECTED IN THE VICINITY OF CLINTON POWER STATION, 2022 RESULTS IN UNITS OF E-3 PCI/CU METER+/- 2 SIGMA COLLECTION GROUP II GROUP Ill PERIOD CL-1 CL-7 CL-8 CL-11 12/29/21 - 01/05/22 31 +/- 5 30 +/- 5 34 +/- 6 32 +/- 5 01/05/22 - 01/12/22 41 +/- 6 28 +/- 5 28 +/- 5 34 +/- 5 01/12/22 - 01/19/22 22 +/- 5 24 +/- 5 24 +/- 5 25 +/- 5 01/19/22 - 01/26/22 17 +/- 5 21 +/- 5 21 +/- 5 26 +/- 5 01 /26/22 - 02/02/22 22 +/- 5 28 +/- 5 27 +/- 5 27 +/- 5 02/02/22 - 02/09/22 27 +/- 5 29 +/- 5 25 +/- 5 33 +/- 5 02/09/22 - 02/16/22 17 +/- 5 13 +/- 5 15 +/- 5 17 +/- 5 02/16/22 - 02/23/22 15 +/- 5 ,11 +/- 5 8 +/- 5 16 +/- 5 02/23/22 - 03/02/22 22 +/- 5 24 +/- 5 17 +/- 5 20 +/- 5 03/02/22 - 03/09/22 19 +/- 4 25 +/- 5 21 +/- 5 23 +/- 5 03/09/22 - 03/16/22 17 +/- 5 19 +/- 5 17 +/- 5 19 +/- 5 03/16/22 - 03/23/22 13 +/- 4 14 +/-4 16 +/- 4 15 +/- 4 03/23/22 - 03/30/22 11 +/- 4 11 +/-4 12 +/- 4 12 +/- 4 03/30/22 - 04/06/22 9+/-4 11 +/- 4 9+/-4 15 +/- 4 04/06/22 - 04/13/22 13 +/- 4 11 +/-4 14 +/- 4 13 +/- 4 04/13/22 - 04/20/22 14 +/- 4 13 +/-4 16 +/- 4 15 +/- 4 04/20/22 - 04/27/22 14 +/- 4 15 +/-4 16 +/- 4 18 +/- 4 04/27/22 - 05/04/22 15 +/- 4 14 +/- 4 12 +/- 4 17 +/- 5 05/04/22 - 05/11/22 9 +/- 4 13 +/- 4 12 +/- 4 13 +/- 4 05/11/22 - 05/18/22 18 +/- 5 19 +/- 5 20 +/- 5 22 +/- 5 05/18/22 - 05/25/22 20 +/- 5 11 +/- 4 14 +/- 4 18 +/- 4 05/25/22 - 06/01/22 14 +/- 4 13 +/- 4 10 +/- 4 19 +/- 5 06/01/22 - 06/08/22 15 +/- 4 18 +/- 4 21 +/- 5 22 +/- 5 06/08/22 - 06/15/22 17 +/- 4 20 +/-5 18 +/- 5 23 +/- 5 06/15/22 - 06/22/22 12 +/- 4 10 +/- 4 14 +/- 4 14 +/- 4 06/22/22 - 06/29/22 8 +/- 4 10 +/- 4 13 +/- 4 15 +/- 4 06/29/22 - 07/06/22 15 +/- 4 17 +/- 4 19 +/- 4 25 +/- 5 07/06/22 - 07/13/22 11 +/- 4 13 +/- 4 16 +/- 4 12 +/- 4 07/13/22 - 07/20/22 20 +/- 4 18 +/- 4 26 +/- 5 24 +/- 5 07/20/22 - 07/27/22 14 +/- 4 14 +/- 4 20 +/- 5 22 +/- 5 07/27 /22 - 08/03/22 14 +/- 4 13 +/-4 14 +/- 4 15 +/- 4 08/03/22 - 08/10/22 14 +/- 4 13 +/- 3 15 +/- 4 13 +/- 3 08/10/22 - 08/17/22 21 +/- 4 20 +/-4 22 +/- 5 23 +/- 5 08/17/22 - 08/24/22 23 +/- 5 (1) 15 +/- 4 (1) 08/24/22 - 08/31 /22 23 +/- 4 (1) 26 +/- 5 22 +/- 4 08/31/22 - 09/07/22 15 +/- 4 18 +/- 5 20 +/- 5 20 +/- 5 09/07/22 - 09/14/22 20 +/- 4 21 +/- 4 23 +/- 5 19 +/- 4 09/14/22 - 09/21/22 23 +/- 4 21 +/- 4 25 +/- 5 24 +/- 5 09/21/22 - 09/28/22 13 +/- 4 16 +/- 4 21 +/- 4 17 +/- 4 09/28/22 - 10/05/22 14 +/- 4 15 +/- 4 18 +/- 4 18 +/- 4 10/05/22 - 10/12/22 22 +/- 5 21 +/- 4 31 +/- 5 26 +/- 5 10/12/22 - 10/19/22 13 +/- 4 14 +/- 4 13 +/- 4 17 +/- 4 10/19/22 - 10/26/22 29 +/- 5 20 +/- 5 27 +/- 5 31 +/- 5 10/26/22 - 11 /02/22 20 +/- 4 22 +/- 4 30 +/- 5 34 +/- 5 11 /02/22 - 11 /09/22 26 +/- 5 20 +/- 4 34 +/- 5 29 +/- 5 11/09/22 - 11/16/22 14 +/- 4 8 +/- 4 16 +/- 4 16 +/- 4 11 /16/22 - 11 /23/22 28 +/- 5 23 +/- 5 29 +/- 5 28 +/- 5 11/23/22 - 11/30/22 42 +/- 6 32 +/- 5 36 +/- 5 43 +/- 6 11/30/22 - 12/07/22 31 +/- 5 23 +/- 4 30 +/- 5 30 +/- 5 12/07/22 - 12/14/22 39 +/- 5 28 +/- 5 32 +/- 5 34 +/- 5 12/14/22 - 12/21/22 29 +/- 5 26 +/- 4 24 +/- 4 31 +/- 5 12/21 /22 - 12/28/22 25 +/- 5 26 +/- 5 30 +/- 5 26 +/- 5 12/28/22 - 01/04/23 33 +/- 5 20 +/- 4 23 +/- 4 30 +/- 5 MEAN+/- 2 STD DEV 20 +/- 16 18 +/- 12 20 +/- 14 22 +/- 14 THE MEAN AND TWO STANDARD DEV/AT/ON ARE CALCULATED USING THE POSITIVE VALUES (1) SEE PROGRAM EXCEPTIONS SECTION FOR EXPLANATION C-11

Table C-Vl.2 MONTHLY AND YEARLY MEAN VALUES OF GROSS BETA CONCENTRATIONS IN AIR PARTICULATE SAMPLES COLLECTED IN THE VICINITY OF CLINTON POWER STATION, 2022 RES ULTS IN UNITS OF E-3 PCI/CU METER+/- 2 SIGMA GROUP I- ON-SITE LOCATIONS GROUP II - INTERMEDIATE DISTANCE LOCATIONS GROUP Ill CONTROL LOCATIONS COLLECTION MIN MAX MEAN COLLECTION MIN MAX MEAN COLLECTION MIN MAX MEAN PERIOD +/-2SD PERIOD +/-2SD PERIOD +/-2SD 12/29/21 - 02/02/22 22 43 28 +/- 10 12/29/21 - 02/02/22 17 41 26 +/- 12 12/29/21 - 02/02/22 25 34 29 +/- 8 02/02/22 - 03/02/22 11 31 19 +/- 12 02/02/22 - 03/02/22 8 29 19 +/- 13 02/02/22 - 03/02/22 16 33 22 +/- 16 03/02/22 - 03/30/22 10 27 17 +/- 9 03/02/22 03/30/22 11 25 16 +/- 9 03/02/22 - 03/30/22 12 23 17 +/- 10 03/30/22 04/27/22 9 21 14 +/- 7 03/30/22 - 04/27/22 9 16 13 +/- 5 03/30/22 - 04/27/22 13 18 15 +/- 4 04/27/22 - 06/01/22 10 23 16 +/- 6 04/27/22 - 06/01/22 9 20 14 +/- 7 04/27/22 - 06/01 /22 13 22 18 +/- 7 06/01/22 - 06/29/22 10 22 17 +/- 8 06/01/22 06/29/22 8 21 15 +/- 9 06/01/22 06/29/22 14 23 18 +/- 9 06/29/22 - 08/03/22 9 26 18 +/- 10 06/29/22 - 08/03/22 11 26 16 +/- 7 06/29/22 - 08/03/22 12 25 20 +/- 12 08/03/22 - 08/31/22 8 25 18 +/- 9 08/03/22 - 08/31 /22 13 26 19 +/- 9 08/03/22 - 08/31/22 13 23 19 +/- 11 08/31/22 09/28/22 15 26 20 +/-7 08/31 /22 - 09/28/22 13 25 20 +/- 7 08/31/22. - 09/28/22 17 24 20 +/- 6 09/28/22 - 11/02/22 11 32 21 +/- 13 09/28/22 11/02/22 13 31 21 +/- 13 09/28/22 - 11/02/22 17 34 25 :!: 15 11 /02/22 - 11 /30/22 14 43 27 +/- 16 11 /02/22 - 11 /30/22 8 42 26 +/- 20 11/02/22 11/30/22 16 43 29 +/- 22 0I I\)

11/30/22 - 01/04/23 22 36 29 +/- 7 11/30/22 01/04/23 20 39 28 +/- 10 11 /30/22 - 01 /04/23 26 34 30 +/-6 12/29/21 - 01/04/23 8 43 20 +/- 14 12/29/21 - 01/04/23 8 42 19 +/- 14 12/29/21 - 01/04/23 12 43 22 +/- 14

Table C-Vl.3 CONCENTRATIONS OF GAMMA EMITTERS IN AIR PARTICULATE SAMPLES COLLECTED IN THE VICINITY OF CLINTON POWER STATION, 2022 RES ULTS JN UNITS OF E-3 PCI/CU METER+/- 2 SIGMA COLLECTION SITE PERIOD Co-60 Nb-95 Zr-95 Ru-103 Ru-106 Cs-134 Cs-137 Ce-141 Ce-144 CL-1 12/29/21 - 03/30/22 <3 <4 < 7 <4 < 25 <3 <3 <5 < 14 03/30/22 06/29/22 <2 <3 < 5 <3 < 26 <4 <3 ~< 3 < 10 06/29/22 - 09/28/22 <4 <3 < 5 <4 < 25 <3 <3 <5 < 13 09/28/22 - 01/04/23 <3 <3 < 5 <2 < 23 <3 <3 <4 < 12 MEAN CL-2 12/29/21 03/30/22 <2 <2 <4 <2 < 17 <2 < 2 <3 <9 03/30/22 - 06/29/22 <2 <2 <5 <2 < 16 <2 < 2 <3 <6 06/29/22 - 09/28/22 <3 <3 <5 <3 < 24 <3 < 2 <4 < 11 09/28/22 - 01 /04/23 <2 <2 <3 <2 < 11 <2 < 2 <2 <7 MEAN 0I CL-3 12/29/21 - 03/30/22 <2 <2 < 5 <3 < 18 <2 <2 <3 < 9

~

CIJ 03/30/22 - 06/29/22 <3 <2 < 3 <2 < 17 <2 <2 <3 < 8 06/29/22 09/28/22 <2 <2 < 3 <2 < 18 <2 <2 <3 < 7 09/28/22 - 01/04/23 <2 <2 < 1 < 1 < 17 <2 <2 <2 < 6 MEAN CL-4 12/29/21 - 03/30/22 < 4 <4 <7 <4 < 27 <4 <3 <4 < 12 03/30/22 06/29/22 <2 <2 <3 <3 < 14 <2 <2 <3 <7 06/29/22 - 09/28/22 <2 <3 <4 <2 < 14 <2 <2 <3 <5 09/28/22 - 01/04/23 <3 <2 <4 <3 < 23 <2 <2 <3 < 11 MEAN CL-6 12/29/21 - 03/30/22 <3 <2 <6 <2 < 19 <3 <2 <3 <9 03/30/22 06/29/22 <4 <3 <4 <2 < 21 <2 <2 <3 < 10 06/29/22 - 09/28/22 <3 <4 <8 <4 < 25 <3 <3 <5 < 13 09/28/22 01/04/23 <3 <2 <3 <2 < 12 <2 <2 <2 <7 MEAN

Table C-Vl.3 CONCENTRATIONS OF GAMMA EMITTERS IN AIR PARTICULATE SAMPLES COLLECTED IN THE VICINITY OF CLINTON POWER STATION, 2022 RESULTS IN UNITS OF E-3 PCI/CU METER+/- 2 SIGMA COLLECTION SITE PERIOD Co-60 Nb-95 Zr-95 Ru-103 Ru-106 Cs-134 Cs-137 Ce-141 Ce-144 CL-7 12/29/21 03/30/22 < 3 <3 <5 <3 < 21 < 2 <2 <4 < 10 03/30/22 - 06/29/22 <3 <4 <6 <4 < 26 <4 <3 <3 < 11 06/29/22 - 09/28/22 < 3 <4 <6 <4 < 27 <4 <3 <5 < 11 09/28/22 - 01/04/23 < 2 <2 <3 <1 < 10 <2 <2 <2 <7 MEAN CL-8 12/29/21 03/30/22 <2 < 3 <6 <3 < 20 < 3 <3 <4 < 10 03/30/22 06/29/22 <2 <2 <3 <3 < 20 <2 <2 < 3 <6 06/29/22 - 09/28/22 < 2 <2 <4 <2 < 16 <2 <2 <3 < 8 09/28/22 - 01/04/23 < 3 < 1 <4 <2 < 16 <2 <2 <3 < 7 MEAN 0 CL-11 12/29/21 - 03/30/22 < 2 <2 < 3 <2 < 15 <2 <2 <3 < 7

.....* 03/30/22 - 06/29/22 < 3 <2 < 6 <3 < 25 <4 < 3 <3 < 10

~

06/29/22 - 09/28/22 <2 <3 < 5 <2 < 17 <2 < 1 <3 < 7 09/28/22

01/04/23 <2 < 3 < 5 <2 < 24 <3 <3 <4 < 12 MEAN CL-15 12/29/21 - 03/30/22 < 2 < <2 <3 <3 < 18 <2 <2 <3 <7 03/30/22 - 06/29/22 <3 <3 <4 < 3 < 20 <2 <2 <3 < 11 06/29/22 - 09/28/22 < 3 <3 < 5 <3 < 26 < 3 <2 <5 < 12 09/28/22 - 01/04/23 <2 <2 <4 < 1 < 15 <2 <2 <2 <6 MEAN CL-94 12/29/21 - 03/30/22 <2 <2 <4 <2 < 18 <2 <2 <3 < 9 03/30/22 06/29/22 <2 <2 <4 <2 < 15 < 2 <2 < 2 < 8 06/29/22 09/28/22 < 3 <3 < 5 <3 < 21 < 3 <2 <4 <9 09/28/22 01/04/23 <2 <2 <3 <2 < 10 <2 <2 <2 < 6 MEAN

Table C-Vll.1 CONCENTRATIONS OF I-131 IN AIR IODINE SAMPLES COLLECTED IN THE VICINITY OF CLINTON POWER STATION, 2022 RESULTS IN UNITS OF E-3 PCI/CU METER +/- 2 SIGMA COLLECTION GROUP I PERIOD CL-2 CL-3 CL-4 CL-6 CL-15 CL-94 12/29/21 - 01/05/22 < 17 < 33 < 33 (1) < 39 < 38 01/05/22 - 01/12/22 < 46 < 46 < 46 < 10 < 43 < 43 01/12/22 - 01/19/22 < 24 < 24 < 24 < 25 < 18 < 18 01/19/22 - 01/26/22 < 30 < 31 < 30 < 30 < 26 < 25 01 /26/22 - 02/02/22 < 33 < 27 < 32 < 32 < 37 < 37 02/02/22 - 02/09/22 < 39 < 39 < 38 < 38 < 13 < 30 02/09/22 - 02/16/22 < 50 < 50 < 50 < 22 < 17 < 35 02/16/22 - 02/23/22 < 39 < 39 < 39 < 27 < 34 < 33 02/23/22 - 03/02/22 < 40 < 41 < 41 < 40 < 16 < 32 03/02/22 - 03/09/22 < 44 < 44 < 44 < 22 < 24 < 58 03/09/22 - 03/16/22 < 18 < 38 < 37 < 37 < 56 < 56 03/16/22 - 03/23/22 < 28 < 33 < 25 < 26 < 33 < 14 03/23/22 - 03/30/22 < 59 < 59 < 59 < 59 < 41 < 17 03/30/22 - 04/06/22 < 30 < 15 < 30 < 31 < 13 < 28 04/06/22 - 04/13/22 < 26 < 25 < 25 < 15 < 40 < 19 04/13/22 - 04/20/22 < 54 < 54 < 54 < 26 < 34 < 34 04/20/22 - 04/27/22 < 34 < 34 < 33 < 23 < 41 < 41 04/27/22 - 05/04/22 < 57 < 23 < 56 < 58 < 43 < 43 05/04/22 - 05/11/22 < 43 < 19 < 43 < 43 < 30 < 29 05/11/22 - 05/18/22 < 46 < 45 < 46 < 47 < 29 < 29 05/18/22 - 05/25/22 < 36 < 29 < 36 < 36 < 60 < 26 05/25/22 - 06/01/22 < 51 < 52 < 52 < 52 < 43 < 43 06/01/22 - 06/08/22 < 53 < 53 < 53 < 55 < 53 < 52 06/08/22 - 06/15/22 < 54 < 54 < 54 < 55 < 57 < 57 06/15/22 - 06/22/22 < 41 < 41 < 40 < 20 < 36 < 36 06/22/22 - 06/29/22 < 53 < 54 < 53 < 23 < 58 < 24 06/29/22 - 07/06/22 < 21 < 51 < 51 < 51 < 25 < 59 07/06/22 - 07/13/22 < 19 < 47 < 46 < 47 < 64 < 64 07/13/22 - 07/20/22 < 19 < 46 < 46 < 47 < 48 < 20 07/20/22 - 07/27/22 < 47 < 46 < 20 < 47 < 51 < 51 07/27/22 - 08/03/22 < 36 < 36 < 35 < 15 < 46 < 45 08/03/22 - 08/10/22 < 24 < 30 < 29 < 30 < 60 < 60 08/10/22 - 08/17/22 < 23 < 27 < 27 < 27 < 27 < 32 08/17/22 - 08/24/22 < 19 < 38 < 38 < 38 < 14 < 31 08/24/22 - 08/31/22 < 57 < 48 < 57 < 57 < 67 < 68 08/31/22 - 09/07/22 < 45 < 44 < 45 < 19 < 47 < 47 09/07/22 - 09/14/22 < 53 < 52 < 52 < 22 < 59 < 59 09/14/22 - 09/21/22 < 55 < 23 < 56 < 56 < 29 < 35 09/21/22 - 09/28/22 < 51 < 50 < 51 < 50 < 53 < 22 09/28/22 - 10/05/22 < 50 < 50 < 50 < 21 < 65 < 66 10/05/22 - 10/12/22 < 44 < 44 < 44 < 44 < 59 < 24 10/12/22 - 10/19/22 < 16 < 20 < 20 < 20 < 27 < 11 10/19/22 - 10/26/22 < 19 < 47 < 49 < 47 < 46 < 46 10/26/22 - 11 /02/22 < 27 < 41 < 40 < 41 < 41 < 41 11 /02/22 - 11 /09/22 < 54 < 54 < 53 < 53 < 22 < 50 11 /09/22 - 11 /16/22 < 50 < 51 < 50 < 21 < 43 < 21 11 /16/22 - 11 /23/22 < 51 < 49 < 52 < 51 < 22 < 46 11 /23/22 - 11 /30/22 < 23 < 23 < 23 < 23 < 14 < 33 11/30/22 - 12/07/22 < 63 < 62 < 27 < 64 < 46 < 22 12/07/22 - 12/14/22 < 50 < 50 < 21 < 50 < 53 < 22 12/14/22 - 12/21/22 < 44 < 45 < 45 < 44 < 43 < 42 12/21/22 - 12/28/22 < 45 < 46 < 47 < 47 < 38 < 38 12/28/22 - 01/04/23 < 41 < 41 < 21 < 41 < 43 < 43 MEAN (1) SEE PROGRAM EXCEPTIONS SECTION FOR EXPLANATION C-15

Table C-Vll.1 CONCENTRATIONS OF 1-131 IN AIR IODINE SAMPLES COLLECTED IN THE VICINITY OF CLINTON POWER STATION, 2022 RESULTS IN UNITS OF E-3 PCI/CU METER +/- 2 SIGMA COLLECTION GROUP II I GROUP Ill PERIOD CL-1 CL-7 CL-8 CL-11 12/29/21 - 01/05/22 < 33 < 33 < 39 < 38 01/05/22

01/12/22 < 46 < 43 < 21 < 43 01/12/22 - 01/19/22 < 20 < 17 < 18 < 17 01/19/22 01/26/22 < 13 < 22 < 26 < 25 01/26/22 02/02/22 < 32 < 37 < 16 < 37 02/02/22 - 02/09/22 < 17 < 30 < 30 < 31 02/09/22 - 02/16/22 < 51 < 36 < 35 < 35 02/16/22

02/23/22 < 39 < 32 < 28 < 33 02/23/22 - 03/02/22 < 28 < 32 < 32 < 32 03/02/22 - 03/09/22 < 44 < 57 < 61 < 57 03/09/22 03/16/22 < 38 < 56 < 56 * < 24 03/16/22 - 03/23/22 < 25 < 33 < 34 < 33 03/23/22 - 03/30/22 < 25 < 41 < 41 < 41 03/30/22 - 04/06/22 < 30 < 28 < 28 < 28 04/06/22 04/13/22 < 25 < 39 < 40 < 39 04/13/22 - 04/20/22 < 55 < 28 < 35 < 34 04/20/22 - 04/27/22 < 33 < 41 < 18 < 40 04/27/22 - 05/04/22 < 57 < 43 < 23 < 43 05/04/22

05/11 /22 < 44 < 29 < 29 < 25 05/11/22

05/18/22 < 19 < 24 < 30 < 29 05/18/22 - 05/25/22 < 36 < 61 < 61 < 61 05/25/22 06/01/22 < 22 < 43 < 18 < 43 06101/22 06/08/22 < 26 < 52 < 52 < 22 06/08/22 - 06/15/22 < 23 < 56 < 24 < 56 06/15/22 - 06/22/22 < 41 <.36 < 36 < 30 06/22/22 - 06/29/22 < 54 < 57 < 58 < 57 06/29/22 07/06/22 < 51 < 58 < 58 < 57 07/06/22 - 07/13/22 < 47 < 64 < 64 < 27 07/13/22 07/20/22 < 46 < 48 < 48 < 47 07/20/22 07/27/22 < 47 < 22 < 51 < 51 07/27/22 - 08/03/22 < 36 < 45 < 45 < 19 08/03/22 - 08/10/22 < 30 < 26 < 60 < 61 08/10/22 - 08/17/22 < 27 < 32 < 32 < 32 08/17/22 - 08/24/22 < 38 < 31 < 31 < 31 08/24/22 - 08/31 /22 < 58 (1) < 66 < 44 08/31/22 - 09/07/22 < 45 < 21 < 48 < 47 09/07/22 09/14/22 < 54 < 59 < 59 < 24 09/14/22 - 09/21 /22 < 55 < 35 < 35 < 35 09/21/22

09/28/22 < 22 < 53 < 53 < 53 09/28/22 - 10/05/22 < 50 < 67 < 67 < 28 10/05/22 10/12/22 < 19 < 58 < 58 < 59 10/12/22 - 10/19/22 < 20 < 27 < 27 < 27 10/19/22 - 10/26/22 < 49 < 46 < 20 < 44 10/26/22 - 11 /02/22 < 41 < 21 < 42 < 42 11 /02/22

11 /09/22 < 23 < 50 < 50 < 51 11/09/22 - 11/16/22 < 51 < 43 < 43 < 43 11/16/22 11/23/22 < 22 < 46 < 46 < 46 11/23/22 11/30/22 < 19 < 32 < 33 < 32 11/30/22 - 12/07/22 < 64 < 46 < 45 < 46 12/07/22 - 12/14/22 < 50 < 53 < 53 < 53 12/14/22

12/21/22 < 29 < 19 < 42 < 42 12/21/22 12/28/22 < 20 < 17 < 37 < 37 12/28/22 - 01/04/23 < 41 < 43 < 43 < 29 MEAN (1) SEE PROGRAM EXCEPTIONS SECTION FOR EXPLANATION C-16

Table C-Vlll.1 CONCENTRATIONS OF 1-131 IN MILK SAMPLES COLLECTED IN THE VICINITY OF CLINTON POWER STATION, 2022 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION CONTROL FARM PERIOD CL-116 01/26/22 < 0.8 02/23/22 < 0.9 03/30/22 < 0.9 04/27/22 < 1.0 05/11/22 < 0.6 05/25/22 < 0.7 06/08/22 < 0.9 06/22/22 < 0.8 07/06/22 < 0.9 07/20/22 < 0.8 08/03/22 < 0.8 08/17/22 < 0.8 08/31/22 < 0.9 09/14/22 < 0.9 09/28/22 < 0.7 10/12/22 < 0.9 10/26/22 < 0.9 11/30/22 < 0.8 12/28/22 < 0.9 MEAN C-17

Table C-Vlll.2 CONCENTRATIONS OF GAMMA EMITTERS IN MILK SAMPLES COLLECTED IN THE VICINITY OF CLINTON POWER STATION, 2022 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION SITE PERIOD K-40 Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 Cs-134 Cs-137 Ba-140 La-140 Ce-144 CL-116 01126122 1200 +/- 124 < 5 < 5 < 10 <5 < 13 < 5 < 9 <6 <5 < 20 < 5 < 38 02123122 1066 +/- 152 <7 < 8 < 18 <7 < 15 < 7 < 12 < 8 <7 < 37 < 10 < 51 03130122 947 +/- 179 < 8 < 7 < 19 <8 < 18 < 8 < 13 < 9 < 9 < 39 < 12 < 48 04127122 839 +/- 156 <8 < 9 < 17 <8 < 19 < 9 < 12 < 8 < 10 < 42 < 11 < 64 05111122 721 +/- 161 <6 < 6 < 11 <7 < 16 < 5 < 12 < 7 <7 < 27 < 12 < 43 05125122 1073 +/- 168 <7 < 9 < 16 < 9 < 17 < 8 < 14 <7 <8 < 38 < 9 < 52 06108122 669 +/- 140 < 8 < 9 < 16 < 11 < 16 < 5 < 16 < 8 < 9 < 27 < 10 < 54 06122122 874 +/- 167 < 8 < 7 < 18 < 10 < 16 < 9 < 14 <6 < 8 < 39 < 9 < 47 07106122 936 +/- 150 <6 < 7 < 18 <9 < 13 < 7 < 12 < 8 <6 < 27 < 8 < 42 07120122 1180 +/- 138 <8 < 8 < 18 <9 < 20 < 8 < 15 < 9 <7 < 37 < 10 < 52 08103122 841 +/- 128 <7 < 6 < 15 <7 < 13 < 6 < 12 < 7 <7 < 28 < 11 < 36 C') 08117122 1018 +/- 180 <7 < 8 < 18 < 8 < 18 < 7 < 13 < 9 < 9 < 29 < 12 < 49 I

..I,, 08131122 1139 +/- 147 < 5 < 5 < 14 <6 < 13 < 7 < 12 <6 <6 < 27 < 10 < 49 00 09114122 972 +/- 197 < 10 < 11 < 24 < 14 < 21 < 15 < 18 < 11 < 11 < 49 < 14 < 93 09128122 846 +/- 187 < 10 < 6 < 14 <9 < 17 < 9 < 13 < 9 <8 < 37 < 10 < 53 10112122 635 +/- 127 <6 < 6 < 16 < 10 < 17 < 9 < 14 < 9 <7 < 31 < 11 < 48 10126122 1185 +/- 178 < 9 < 7 < 15 <8 < 17 < 7 < 13 < 8 <6 < 39 < 11 < 60 11130122 1089 +/- 166 < 8 < 6 < 19 <6 < 18 < 6 < 14 < 9 <7 < 35 < 12 < 45 12128122 960 +/- 155 <8 < 8 < 17 <7 < 19 < 7 < 12 < 9 <9 < 32 < 9 < 54 MEAN +/- 2 STD DEV 957 +/- 343 THE MEAN AND 1WO STANDARD DEVIATION ARE CALCULATED USING THE POSITIVE VALUES

Table C-IX.1 CONCENTRATIONS OF GAMMA EMITTERS IN VEGETATION SAMPLES COLLECTED IN THE VICINITY OF CLINTON POWER STATION, 2022 RESULTS IN UNITS OF PCI/KG WET+/- 2 SIGMA COLLECTION SITE PERIOD Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 1-131 Cs-134 Cs-137 Ba-140 La-140 Ce-144 CL-114 Kale 06/29/22 < 22 < 23 < 53 < 31 < 59 < 23 < 46 < 35 < 28 < 22 < 116 < 39 < 104 Lettuce 06/29/22 < 28 < 24 < 76 < 33 < 72 < 32 < 57 < 56 < 32 < 33 < 144 < 17 < 206 Swiss Chard 06/29/22 < 24 < 27 < 63 < 30 < 78 < 29 < 49 < 54 < 29 < 30 < 125 < 27 < 186 Kale 07/27/22 < 44 < 33 < 79 < 38 < 90 < 31 < 73 < 52 < 43 < 37 < 158 < 39 < 187 Lettuce 07/27/22 < 29 < 31 < 81 < 36 < 77 < 30 < 53 < 41 < 32 < 35 < 135 < 22 < 176 Swiss Chard 07127122 < 28 < 39 < 81 < 39 < 77 < 31 < 61 < 48 < 37 < 36 < 116 < 11 < 216 Kale 08/31/22 < 29 < 29 < 75 < 35 < 73 < 29 < 52 < 55 < 32 < 28 < 153 < 51 < 144 Lettuce 08/31/22 < 21 < 24 < 64 < 24 < 61 < 25 < 42 < 52 < 26 < 21 < 137 < 34 < 129 Swiss Chard 08/31/22 < 26 < 29 < 71 < 29 < 71 < 33 < 46 < 58 < 27 < 28 < 160 < 56 < 152 Kale 09/28/22 < 35 < 36 < 88 < 49 < 96 < 39 < 66 < 54 < 40 < 41 < 149 < 52 < 203 Cabbage 09/28/22 < 36 < 32 < 63 < 43 < 83 < 34 < 58 < 53 < 35 < 34 < 161 < 38 < 200 Swiss Chard 09/28/22 < 45 < 28 < 66 < 30 < 89 < 34 < 45 < 50 < 43 < 36 < 143 < 39 < 189 MEAN CL-115 Kale 06/29/22 < 32 < 35 < 68 < 30 < 78 < 33 < 53 < 55 < 36 < 26 < 148 < 23 < 168 Lettuce 06129/22 < 23 < 22 < 22 < 18 < 42 < 21 < 33 < 28 < 21 < 17 < 79 < 40 < 89 C) Swiss Chard 06/29/22 < 17 < 16 < 40 < 18 < 37 < 16 < 27 < 26 < 16 < 13 < 92 < 15 < 94 (0

I Kale 07/27/22 < 30 < 24 < 54 < 31 < 57 < 26 < 49 < 37 < 28 < 28 < 122 < 36 < 123 Lettuce 07/27/22 < 26 < 23 < 46 < 26 < 46 < 23 < 35 < 31 < 28 < 26 < 107 < 22 < 156 Swiss Chard 07/27/22 < 18 < 20 < 50 < 24 < 41 < 20 < 31 < 34 < 19 < 23 < 90 < 19 < 135 Kale 08/31122 < 20 < 23 < 48 < 24 < 51 < 25 < 41 < 55 < 21 < 23 < 136 < 26 < 135 Lettuce 08/31/22 < 22 < 20 < 56 < 23 < 54 < 22 < 43 < 51 < 25 < 20 < 135 < 49 < 105 Swiss Chard 08/31122 < 23 < 24 < 55 < 25 < 50 < 24 < 35 < 58 < 22 < 26 < 135 < 32 < 106 Kale 09/28/22 < 31 < 28 < 61 < 33 < 69 < 38 < 54 < 48 < 27 < 32 < 141 < 37 < 199 Gabbage 09/28/22 < 25 < 23 < 56 < 27 < 56 < 23 < 48 < 46 < 27 < 24 < 124 < 32 < 171 Swiss Chard 09/28122 < 30 < 32 < 70 < 32 < 80 < 32 < 53 < 53 < 34 < 37 < 146 < 51 < 191 MEAN CL-118 Cabbage/Kale 06/29122 < 30 < 31 < 74 < 37 < 81 < 32 < 64 < 39 < 33 < 31 < 146 < 35 < 139 Lettuce 06/29122 < 24 < 24 < 54 < 23 < 56 < 25 < 39 < 34 < 25 < 21 < 102 < 43 < 96 Swiss Chard/Lettuce 06/29/22 < 21 < 21 < 57 < 21 < 46 < 26 < 42 < 37 < 24 < 22 < 105 < 26 < 143 Kale 07127122 < 34 < 43 < 67 < 32 < 77 < 37 < 65 < 53 < 42 < 35 < 182 < 30 < 254 Lettuce 07/27122 < 24 < 31 < 50 < 23 < 62 < 25 < 49 < 45 < 31 < 29 < 129 < 33 < 191 Swiss Chard 07/27/22 < 33 < 32 < 73 < 29 < 82 < 29 < 59 < 53 < 37 < 40 < 145 < 43 < 194 Kale 08/31122 < 13 < 13 < 32 < 15 < 30 < 14 < 24 < 37 < 14 < 13 < 88 < 22 < 71 Lettuce 08/31/22 < 20 < 26 < 54 < 21 < 51 < 25 < 36 < 56 < 27 < 20 < 139 < 29 < 136 Cabbage 08/31/22 < 22 < 18 < 51 < 23 < 51 < 20 < 34 < 57 < 22 < 21 < 122 < 37 < 120 Swiss Chard 09/28/22 < 36 < 36 < 62 < 32 < 79 < 33 < 63 < 50 < 39 < 31 < 155 < 48 < 221 Cabbage 09/28/22 < 33 < 37 < 68 < 35 < 85 < 31 < 59 < 50 < 34 < 33 < 118 < 44 < 228 Gabbage 09/28/22 < 37 < 31 < 71 < 34 < 86 < 36 < 58 < 49 < 36 < 39 < 164 < 42 < 189 MEAN

Table C-IX.2 CONCENTRATIONS OF GAMMA EMITTERS IN GRASS SAMPLES COLLECTED IN THE VICINITY OF CLINTON POWER STATION, 2022 RES ULTS IN UNITS OF PCI/KG WET+/- 2 SIGMA COLLECTION SITE PERIOD Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 1-131 Cs-134 Cs-137 Ba-140 La-140 Ce-144 CL-01 05/11/22 < 32 < 37 < 63 < 38 < 80 < 31 < 53 < 39 < 33 < 32 < 107 < 41 < 169 05/25/22 < 32 < 35 < 73 < 32 < 67 < 35 < 67 < 50 < 32 < 28 < 137 < 39 < 163 06/08/22 < 24 < 20 < 39 < 22 < 53 < 26 < 37 < 28 < 24 < 22 < 99 < 33 < 110 06/22/22 < 26 < 30 < 73 < 32 < 74 < 30 < 55 < 46 < 34 < 29 < 124 < 46 < 149 07/06/22 < 32 < 36 < 70 < 28 < 74 < 34 < 52 < 50 < 37 < 23 < 154 < 39 < 189 07/20/22 < 28 < 25 < 64 < 36 < 67 < 28 < 45 < 39 < 36 < 28 < 130 < 45 < 151 08/03/22 < 31 < 24 < 46 < 30 < 62 < 23 < 51 < 31 < 25 < 25 < 93 < 29 < 173 08/17/22 < 25 < 24 < 66 < 34 < 61 < 27 < 43 < 29 < 28 < 31 < 102 < 33 < 182 08/31/22 < 24 < 28 < 56 < 31 < 54 < 25 < 41 < 44 < 28 < 25 < 118 < 34 < 160 09/14/22 < 33 < 27 < 72 < 39 < 74 < 29 < 54 < 48 < 39 < 25 < 126 < 46 < 152 09/28/22 < 33 < 30 < 69 < 34 < 84 < 32 < 63 < 51 < 29 < 34 < 136 < 33 < 206 10/12/22 < 43 < 36 < 80 < 45 < 86 < 43 < 69 < 45 < 34 < 33 < 150 < 49 < 223 0I I\)

10/26/22 < 33 < 29 < 64 < 26 < 60 < 36 < 60 < 52 < 30 < 39 < 155 < 33 < 209 0

MEAN CL-02 05/11/22 < 24 < 26 < 48 < 31 < 48 < 26 < 34 < 41 < 34 < 30 < 109 < 22 < 178 05/25/22 < 32 < 31 < 73 < 26 < 71 < 37 < 62 < 49 < 35 < 36 < 133 < 51 < 187 06/08/22 < 29 < 25 < 60 < 26 < 60 < 35 < 41 < 37 < 26 < 23 < 108 < 25 < 171 06/22/22 < 31 < 33 < 95 < 38 < 82 < 32 < 60 < 49 < 24 < 38 < 141 < 29 < 219 07/06/22 < 31 < 31 < 70 < 45 < 75 < 31 < 59 < 45 < 34 < 36 < 135 < 37 < 188 07/20/22 < 39 < 33 < 92 < 38 < 84 < 24 < 51 < 52 < 33 < 35 < 119 < 56 < 196 08/03/22 < 26 < 35 < 67 < 37 < 65 < 35 < 58 < 36 < 37 < 27 < 133 < 33 < 209 08/17/22 < 25 < 30 < 82 < 29 < 79 < 30 < 39 < 26 < 38 < 28 < 99 < 27 < 173 08/31/22 < 27 < 27 < 52 < 23 < 57 < 26 < 46 < 47 < 29 < 26 < 134 < 45 < 127 09/14/22 < 40 < 48 < 70 < 43 < 68 < 39 < 65 < 57 < 39 < 47 < 180 < 35 < 281 09/28/22 < 25 < 42 < 68 < 38 < 80 < 33 < 44 < 46 < 37 < 27 < 120 < 33 < 155 10/12/22 < 31 < 26 < 70 < 38 < 75 < 32 < 56 < 51 < 37 < 25 < 128 < 35 < 191 10/26/22 < 28 < 26 < 79 < 39 < 82 < 35 < 69 < 41 < 39 < 31 < 117 < 46 < 186 MEAN

Table C-IX.2 CONCENTRATIONS OF GAMMA EMITTERS IN GRASS SAMPLES COLLECTED IN THE VICINITY OF CLINTON POWER STATION, 2022 RESULTS IN UNITS OF PCI/KG WET+/- 2 SIGMA COLLECTION SITE PERIOD Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 1-131 Cs-134 Cs-137 Ba-140 La-140 Ce-144 CL-08 05/11/22 < 26 < 22 < 45 < 25 < 68 < 26 < 53 < 37 < 26 < 25 < 118 < 24 < 145 05/25/22 < 32 < 37 < 73 < 34 < 69 < 32 < 58 < 53 < 32 < 35 < 158 < 46 < 220 06/08/22 < 25 < 29 < 77 < 32 < 64 < 28 < 45 < 48 < 31 < 31 < 121 < 36 < 175 06/22/22 < 32 < 35 < 80 < 41 < 79 < 29 < 57 < 51 < 36 < 31 < 125 < 39 < 212 07/06/22 < 31 < 33 < 69 < 37 < 98 < 39 < 70 < 48 < 47 < 38 < 154 < 52 < 199 07/20/22 < 38 < 35 < 83 < 52 < 94 < 40 < 70 < 57 < 43 < 39 < 169 < 41 < 212 08/03/22 < 45 < 33 < 84 < 43 < 90 < 48 < 70 < 47 < 39 < 33 < 170 < 39 < 269 08/17/22 < 30 < 32 < 84 < 30 < 63 < 32 < 55 < 34 < 31 < 32 < 93 < 23 < 188 08/31/22 < 25 < 23 < 65 < 24 < 51 < 25 < 37 < 43 < 23 < 22 < 109 < 29 < 162 09/14/22 < 37 < 34 < 83 < 31 < 81 < 35 < 37 < 56 < 37 < 34 < 123 < 55 < 193 09/28/22 < 31 < 28 < 70 < 31 < 75 < 30 < 54 < 58 < 33 < 26 < 146 < 43 < 204 10/12/22- < 34 < 25 < 68 < 25 < 61 < 33 * < 53 < 40 < 30 < 30 < 100 < 38 < 182 C)

I 10/26/22 < 21 < 26 < 59 < 26 < 53 < 25 < 41 < 46 < 25 < 24 < 137 < 33 < 166 N

...I,.

MEAN CL-116 05/11/22 < 29 < 27 < 57 < 33 < 66 < 26 < 45 < 38 < 24 < 24 < 105 < 33 < 158 05/25/22 < 27 < 25 < 66 < 27 < 72 < 28 < 54 < 47 < 34 < 31 < 100 < 27 < 164 06/08/22 < 20 < 24 < 69 < 21 < 51 < 28 < 43 < 35 < 28 < 26 < 99 < 39 < 135 06/22/22 < 34 < 38 < 65 < 34 < 85 < 36 < 49 < 54 < 33 < 35 < 161 < 47 < 203 07/06/22 < 38 < 28 < 93 < 40 < 88 < 30 < 69 < 53 < 36 < 35 < 125 < 47 < 180 07/20/22 < 32 < 35 < 75 < 48 < 75 < 36 < 61 < 54 < 41 < 50 < 151 < 45 < 227 08/03/22 < 21 < 23 < 57 < 32 < 61 < 28 < 48 < 27 < 30 < 25 < 99 < 37 < 146 08/17/22 < 23 < 27 < 52 < 27 < 63 < 25 < 44 < 29 < 30 < 30 < 85 < 29 < 128 08/31/22 < 21 < 24 < 40 < 22 < 36 < 21 < 36 < 37 < 21 < 20 < 94 < 32 < 136 09/14/22 < 36 < 38 < 83 < 32 < 74 < 33 < 58 < 57 < 40 < 38 < 152 < 42 < 208 09/28/22 < 29 < 32 < 58 < 34 < 64 < 28 < 48 < 44 < 36 < 23 < 126 < 39 < 170 10/12/22 < 31 < 31 < 63 < 32 < 62 < 37 < 54 < 46 < 37 < 34 < 145 < 35 < 216 10/26/22 < 23 < 17 < 50 < 22 < 59 < 21 < 34 < 33 < 24 < 26 < 109 < 23 < 140 MEAN

Table C-X.1 QUARTERLY DLR RES ULTS FOR CLINTON POWER STATION, 2022 Qtr 1 Qtr2 Qtr3 Qtr4 Normalized Annual 111 BA+ Annual Facility Location BA (mrem) (mrem) (mrem) (mrem) Dose, MA (mrem/yr) MDDA121 Dose, FA (mrem)

CL-01 18.4 18.0 19.4 17.1 74.0 83.6 72.9 ND CL-02 19.3 19.6 20.0 21.4 76.7 86.2 80.3 ND CL-03 18.4 17.1 18.4 20.3 74.7 84.2 74.2 ND CL-04 18.4 18.6 19.6 20.5 72.8 82.3 77.1 ND CL-05 19.5 18.3 20.3 18.4 76.5 86.0 76.5 ND CL-06 15.8 15.9 17.0 16.0 65.8 75.3 64.7 ND CL-07 17.5 16 18.3 19.3 69.5 79.0 71.1 ND CL-08 17.0 17.6 18.6 18.4 74.0 83.5 71.6 ND CL-11 17.0 16.8 18.1 15.8 69.3 78.8 67.7 ND CL-15 18.1 16.8 18.1 17.5 66.3 75.8 70.5 ND CL-22 19.1 19.0 20.4 19.1 77.6 87.1 77.6 ND CL-23 19.3 18.2 20.4 20.3 81.5 91.0 78.2 ND CL-24 19.4 19.1 21.1 20.2 80.5 90.0 79.8 ND Cl-33 17.5 19.9 20.3 19.8 79.2 88.7 77.5 ND CL-34 18.6 17.5 18.4 18.6 77.5 87.0 73.1 ND CL-35 19.4 17.8 17.9 16.7 71.6 81.1 71.8 ND CL-36 17.2 16.5 20.1 18.6 74.2 83.7 72.4 ND CL-37 17.9 17.4 19.5 18.2 71.1 80.6 73.0 ND CL-41 19.1 18.8 22.8 19.1 79.4 88.9 79.8 ND CL-42 18.2 16.5 18.8 19.8 74.2 83.7 73.3 ND CL-43 18.2 18.3 20.3 20.0 79.7 89.2 76.8 ND CL-44 18.0 17.3 19.4 17.1 75.4 84.9 71.8 ND CL-45 19.9 18.9 21.1 20.9 80.6 90.1 80.8 ND CL-46 18.6 16.6 19.2 17.5 73.0 82.5 71.9 ND CL-47 18.9 18.3 19.2 16.9 79.4 88.9 73.3 ND CL-48 19.0 17.6 20.5 20.3 74.2 83.7 77.4 ND CL-49 19.9 17.7 21.2 22.1 79.8 89.3 80.9 ND CL-51 19.0 18.8 20.8 20.2 76.6 86.1 78.8 ND CL-52 19.9 19.2 18.3 21.2 75.6 85.1 78.6 ND CL-53 17.5 15.7 19.4 20.7 71.9 81.4 73.3 ND CL-54 19.4 18.7 20.4 18.7 78.0 87.5 77.2 ND CL-55 19.1 17.8 18.5 18.9 78.7 88.2 74.3 ND CL-56 19.3 17.0 19.8 19.5 81.0 90.5 75.6 ND CL-57 19.7 16.7 21.8 21.8 81.5 91.0 80.0 ND CL-58 19.1 20.0 20.3 20.4 79.1 88.6 79.8 ND CL-60 18.6 17.6 20.5 19.8 79.0 88.5 76.5 ND.

CL-61 17.5 17.3 19.2 17.9 78.1 87.6 71.9 ND CL-63 16.6 15.7 17.4 16.6 66.6 76.1 66.3 ND CL-64 19.0 17.8 18.8 19.0 75.9 85.4 74.6 ND CL-65 18.8 18.9 20.2 19.2 80.5 90.01 77.1 ND CL-74 17.0 15.0 16.3 17.5 68 77.51 65.8 ND CL-75 19.6 16.8 19.8 15.7 75.7 85.21 71.9 ND CL-76 19.8 19.0 19.9 19.4 78.7 88.21 78.1 ND CL-77 18.2 16.5 17.4 18.2 72.2 81.71 70.3 ND CL-78 18.5 (3) 20.1 16.9 72 81.51 73.7 ND CL-79 19.0 18.2 18.3 18.8 77.1 86.61 73.6 ND CL-80 18.4 17.5 20.0 19.2 75.5 85.01 74.6 ND CL-81 20.1 17.0 21.6 19.6 76.8 86.31 77 ND CL-84 20.0 15.7 18.4 19.1 76.3 85.81 72 ND CL-90 15.2 14.5 15.9 16.0 62.2 71.71 61.9 ND CL-91 16.0 14.8 18.3 18.5 69.5 79.01 72.2 ND CL-97 20.0 19.4 20.9 20.1 77.6 87.11 75.3 ND CL-99 15.3 14.3 16.2 16.7 60.6 70.11 54 ND CL-114 18.9 18.1 18.1 18.5 72.3 81 .8 73.6 ND 1

<) Baseline background dose (BA): The estimated mean background radiation dose at each field monitoring location annually based on historical measurements, excluding any dose contribution from the monitored facility 2

' l Minimum differential dose (MDDA): The smallest amount of facility related dose at each monitored location annually above the baseline background dose that can be reliably detected by an environmental dosimetry system (3) SEE PROGRAM EXCEPTIONS SECTION FOR EXPLANATION

c-22

FIGURE C-1 MEAN MONTHLY GROSS BETA CONCENTRATION IN AIR PARTICULATE SAMPLES COLLECTED IN THE VICINITY OF CPS, 2022 0.052 0.047 0.042

- 0.037

< ')

E 0.032 0Q.

~

0.027 j:: 0.022

(.)

<(

0.017 0.012 0.007 MONTH

- PRE-OP (ALL SITES)

...,_2022 INDICATOR

-+-2022 CONTROL C-23

FIGURE C-2 MEAN QUARTERLY AMBIENT GAMMA RADIATION LEVELS (DLR)

IN THE VICINITY OF CPS, 2022 30 25 E

CD 20 ix:

E 15 10 QUARTER mPRE-OP 2022 indicator 2022 control C-24

APPENDIX D INTER-LABO RATORY COMPARISON PROGRAM

Intentionally Left Blank Analytics Environmental Radioactivity Cross Check Program Table D.1 TeledJt!ne Brown Engineering Environmental Services TBE Identification Known Ratio of TBE to Month/Year Matrix Nuclide Units Reported Evaluation {bl Number Value {a) Analytics Result Value March 2022 E13706 Milk Sr-89 pCi/L 80.3 96.8 0.83 A Sr-90 pCi/L 12.7 12.6 1.01 A E13707 Milk Ce-141 pCi/L 62.3 65 0.96 A Co-58 pCi/L 158 164 0.96 A Co-60 pCi/L 286 302 0.95 A Cr-51 pCi/L 314 339 0.93 A Cs-134 pCi/L 155 182 0.85 A Cs-137 pCi/L 210 223 0.94 A Fe-59 pCi/L 211 185 1.14 A 1-131 pCi/L 88.0 96.7 0.91 A Mn-54 pCi/L 169 164 1.03 A Zn-65 pCi/L 238 246 0.97 A E13708 Charcoal 1-131 pCi 79.9 87.1 0.92 A E13709 AP Ce-141 pCi 60.9 42.0 1.45 N(1l Co-58 pCi 118 107 1.11 A Co-60 pCi 218 196 1.11 A Cr-51 pCi 251 221 1.14 A Cs-134 pCi 129 118 1.09 A Cs-137 pCi 156 145.0 1.07 A Fe-59 pCi 124 120.0 1.03 A Mn-54 pCi 120 107 1.12 A Zn-65 pCi 162 160 1.01 A E13710 Soil Ce-141 pCi/g 0.123 0.103 1.19 A Co-58 pCi/g 0.254 0.263 0.97 A Co-60 pCi/g 0.493 0.483 1.02 A Cr-51 pCi/g 0.603 0.543 1.11 A Cs-134 pCi/g 0.268 0.292 0.92 A Cs-137 pCi/g 0.399 0.431 0.93 A Fe-59 pCi/g 0.320 0.296 1.08 A Mn-54 pCi/g 0.263 0.263 1.00 A Zn-65 pCi/g 0.407 0.395 1.03 A E13711 AP Sr-89 pCi 83.2 97.4 0.85 A Sr-90 pCi 12.7 12.7 1.00 A (a) The Analytics known value is equal to 100% of the parameter present in the standard as determined by gravimetric and/or volumetric measurements made during standard preparation (b) Analytics evaluation based on TBE internal QC limits:

A= Acceptable - reported result falls within ratio limits of 0.80-1.20 W = Acceptable with warning- reported result falls within 0. 70-0.80 or 1.20-1.30 N = Not Acceptable - reported result falls outside the ratio limits of< 0. 70 and> 1.30 (1) See NCR 22-04 (Page 1 of 2)

Analytics Environmental Radioactivity Cross Check Program Table D.1 Teled~ne Brown Engineering Environmental Services TBE Identification Known Ratio of TBE to Month/Year Matrix Nuclide Units Reported Evaluation (bl Number Value (aJ Analytics Result Value September 2022 E13712 Milk Sr-89 pCi/L 71.1 89.1 0.80 A Sr-90 pCi/L 12.0 13.6 0.88 A E13713 Milk Ce-141 pCi/L 148 161 0.92 A Co-58 pCi/L 178 189 0.94 A Co-60 pCi/L 229 260 0.88 A Cr-51 pCi/L 486 456 1.07 A Cs-134 pCi/L 220 252 0.87 A Cs-137 pCi/L 203 222 0.92 A Fe-59 pCi/L 174 173 1.01 A 1-131 pCi/L 75.9 94.2 0.81 A Mn-54 pCi/L 269 282 0.95 A Zn-65 pCi/L 364 373 0.97 A E13714 Charcoal 1-131 pCi 81.4 83.6 0.97 A E13715 AP Ce-141 pCi 102 91 1.12 A Co-58 pCi 118 107 1.11 A Co-60 pCi 207 147 1.41 Nc2J Cr-51 pCi 310 257 1.21 w Cs-134 pCi 148. 142 1.04 A Cs-137 pCi 137 125 1.10 A Fe-59 pCi 115 98 1.18 A Mn-54 pCi 168 159 1.05 A Zn-65 pCi 240 211 1.14 A E13716 Soil Ce-141 pCi/g 0.288 0.284 1.01 A Co-58 pCi/g 0.320 0.334 0.96 A Co-60 pCi/g 0.445 0.459 0.97 A Cr-51 pCi/g 0.883 0.805 1.10 A Cs-134 pCi/g 0.410 0.446 0.92 A Cs-137 pCi/g 0.447 0.465 0.96 A Fe-59 pCi/g 0.314 0.305 1.03 A Mn-54 pCi/g 0.489 0.499 0.98 A Zn-65 pCi/g 0.666 0.660 1.01 A E13717 AP Sr-89 pCi 87.5 98.3 0.89 A Sr-90 pCi 12.6 15.0 0.84 A (a) The Analytics known value is equal to 100% of the parameter present in the standard as determined by gravimetric and/or volumetric measurements made during standard preparation (b) Analytics evaluation based on TBE internal QC limits:

A= Acceptable - reported result falls within ratio limits of 0.80-1.20 W= Acceptable with warning- reported result falls within 0.70-0.80 or 1.20-1.30 N = Not Acceptable - reported result falls outside the ratio limits of< 0. 70 and > 1.30 (2) See NCR 22-21 (Page 2 of 2)

DOE's Mixed Analyte Performance Evaluation Program (MAPEP)

Table 0.2 Teledlne Brown En9ineerin~ Environmental Services TBE Identification Known Acceptance Month/Year Matrix Nuclide Units Reported Evaluation (bl Number Value (a) Range Value February 2022 22-GrF46 AP Gross Alpha Sq/sample 0.402 1.20 0.36 - 2.04 A Gross Beta Sq/sample 0.669 0.68 0.341 - 1.022 A 22-MaS46 Soil Ni-63 Bq/kg 645 780 546 - 1014 A Tc-99 Bq/kg 526 778 545-1011 N(3l 22-MaSU46 Urine Cs-134 Bq/L 1.67 1.77 1.24 - 2.30 A Cs-137 Bq/L 1.50 1.56 1.09 - 2.03 A Co-57 Bq/L 4.93 5.39 3.77 - 7.01 A Co-60 Bq/L 2.13 2.06 1.44 - 2.68 A Mn-54 Bq/L 4.83 5.08 3.56 - 6.60 A U-234 Bq/L 0.142 0.0074 0.0052 - 0.0096 N(4l U-238 Bq/L 0.0254 0.0103 0.0072 - 0.0134 N(4l Zn-65 Bq/L 4.71 4.48 3.14- 5.82 A 22-MaW46 Water Ni-63 Bq/L 28.6 34.0' 23.8 - 44.2 A Tc-99 Bq/L 8.59 7.90 5.5 - 10.3 A 22-RdV46 Vegetation Cs-134 Sq/sample 6.61 7.61 5.33 - 9.89 A Cs-137 Sq/sample 1.50 1.52 1.06-1.98 A Co-57 Sq/sample 5.11 5.09 3.56 - 6.62 A Co-60 Sq/sample 0.0162 (1) A Mn-54 Sq/sample 2.42 2.59 1.81 - 3.37 A Sr-90 Sq/sample 0.684 0.789 0.552 -1.026 A Zn-65 Sq/sample 1.44 1.47 1.03-1.91 A August 2022 22-MaS47 Soil Ni-63 Bq/kg 14.6 (1) A Tc-99 Bq/kg 994 1000 700 - 1300 A 22-MaW47 Water Ni-63 Bq/L 24.4 32.9 23.0 - 42.8 A Tc-99 Bq/L 1.9 (1) N(Sl 25-RdV47 Vegetation Cs-134 Sq/sample 0.032 (1) A Cs-137 Sq/sample 0.891 1.08 0. 758 - 1.408 A Co-57 Sq/sample 0.006 (1) A Co-60 Sq/sample 4.04 4.62 3.23 - 6.01 A Mn-54 Sq/sample 2.01 2.43 1.70- 3.16 A Sr-90 Sq/sample 1.25 1.60 1.12-2.08 w Zri-65 Sq/sample 6.16 7.49 5.24 - 9.74 A (a) The MAPEP known value is equal to 100% of the parameter present in the standard as determined by gravimetric and/or volumetric measurements made during standard preparation (b) DOEIMAPEP evaluation:

=

A Acceptable - reporled result falls within ratio limits of 0. 80-1.20

=

W Acceptable with warning- reporled result falls within 0.70-0.80 or 1.20-1.30

=

N Not Acceptable - reporled result falls outside the ratio limits of< 0. 70 and> 1.30 (1) False positive test (2) Sensitivity evaluation (3) Tc-99 soi/ cross-checks done for TBE information only- not required (4) See NCR 22-05 (5) See NCR 22-22 (Page 1 of 1)

ERA Environmental Radioactivity Cross Check Program Table D.3 Teledyne Brown Engineering Environmental Services Identification TBE Reported Known Acceptance Month/Year Matrix Nuclide Units Evaluation (b)

Number Value Value<aJ Limits March 2022 MRAD-36 Water Am-241 pCi/L 68.3 74.6 51.2 - 95.4 A Fe-55 pCi/L 797 1140 670 - 1660 A Pu-238 pCi/L 146 147 88.4 - 190 A Pu-239 pCi/L 69.9 71.9 44.5- 88.6 A Soil Sr-90 pCi/kg 8050 6720 2090 10500 A AP Fe-55 pCi/filter 148 127 46.4- 203 A Pu-238 pCi/filter 29.9 29.6 22.3 - 36.4 A Pu-239 pCi/filter 51.6 49.7 37.2 - 60.0 A U-234 pCi/filter 59.9 67.3 49.9 - 78.9 A U-238 pCi/filter 59.0 66.7 50.4 - 79.6 A GR-A pCi/filter 95.6 94.2 49.2 -155 A GR-B pCi/filter 71.2 66.8 40.5-101 A April 2022 RAD-129 Water Ba-133 pCi/L 61.7 62.9 52.3- 69.2 A Cs-134 pCi/L 80.9 81.6 68.8- 89.8 A Cs-137 pCi/L 37.4 36.6 32.1 43.3 A Co-60 pCi/L 103 97.4 87.7 -109 A Zn-65 pCi/L 318 302 272 - 353 A GR-A pCi/L 26.9 20.8 10.4 - 28.3 A GR-B pCi/L 49.7 51.0 34.7-58.1 A U-Nat pCi/L 56.3 68.9 56.3 75.8 A H-3 pCi/L 17,000 18,100 15,800 - 19,000 A Sr-89 pCi/L 65.3 67.9 55.3 76.1 A Sr-90 pCi/L 42.1 42.7 31.5 -49.0 A 1-131 pCi/L 25.7 26.2 21.8-30.9 A September 2022 MRAD-37 Water Am-241 pCi/L 111 96.2 66.0-123 A Fe-55 pCi/L 850 926 544- 1350 A Pu-238 pCi/L 62.1 52.6 31.6 68.2 A Pu-239 pCi/L 139.5 117 72.5 144 A Soil Sr-90 pCi/kg 3350 6270 1950 - 9770 A U-234 pCi/kg 1684 3350 1570 -4390 A U-238 pCi/kg 1658 3320 1820 -4460 Nt<i AP Fe-55 pCi/filter 71.9 122 44.5-195 A Pu-238 pCi/filter 38.8 29.9 22.6 - 36.7 N11i Pu-239 pCi/filter 14.5 13.0 9.73 15.7 A U-234 pCi/filter 78.0 71.5 53.0 - 83.8 A U-238 pCi/filter 79.7 70.9 53.5 - 84.6 A GR-A pCi/filter 62.8 55.5 29.0 - 91.4 A GR-8 pCi/filter 70.9 64.8 39.3 -97.9 A October 2022 RAD-131 Water Ba-133 pCi/L 76.2 79.4 66.6 - 87.3 A Cs-134 pCi/L 28.0 30.5 23.9 - 33.6 A Cs-137 pCi/L 202 212 191 -235 A Co-60 pCi/L 52.4 51.4 46.3 -59.1 A Zn-65 pCi/L 216 216 194 253 A GR-A pCi/L 19.7 16.9 8.28 - 23.7 A GR-B pCi/L 49.8 53.0 36.1 -60.0 A U-Nat pCi/L 10.54 8.53 6.60- 9.88 N\O)

H-3 pCi/L 13,900 15,100 13,200 -16,600 A Sr-89 pCi/L 59.7 64.5 52.3 - 72.5 A Sr-90 pCi/L 32.9 37.3 27.4-43.0 A 1-131 pCi/L 26.9 24.4 20.2 28.9 A (a) The ERA known value is equal to 100% of the parameter present in the standard as determined by gravimetric and/or volumetric measurements made during standard preparation.

(b) ERA evaluation:

A = Acceptable - Reported value falls within the Acceptance Limits N = Not Acceptable - Reported value falls outside of the Acceptance Limits (1) See NCR 22-19 (2) U soil cross-checks done for TB£. information only - not required (3) See NCR 22-20 (Page 1 of 1)

APPENDIX E ERRATA DATA

Intentionally Left Blank In the 2021 AREOR, the following statement was incorrect:

"The highest calculated offsite dose received by a member of the public in 2021 due to the release of gaseous effluents from CPS was 3.3E-02 or 0.0337 mRem." (page 5)

The correct values should have been 3.13E-02 or 0.0313 mRem. (IR 04543917)

I. Summary and Conclusions This report on the Radiological Environmental Monitoring Program (REMP) conducted for the Clinton Power Station (CPS) by Exelon Generation Company, LLC (Exelon) covers the period January 1, 2021, through December 31, 2021.

During that time period, 1,556 analyses were performed on 1,430 samples. In assessing all the data gathered for this report and comparing these results with preoperational data, it was concluded that the operation of CPS had no adverse radiological impact on the environment.

There were zero (0) radioactive liquid releases from CPS during 2021. , Releases of gaseous radioactive materials were accurately measured in plant effluents.

There were no gaseous effluent releases that approached the limits specified in the CPS Offsite Dose Calculation Manual (ODCM). The highest calculated offsite dose received by a member of the public in 2021 due to the release of gaseous effluents from CPS was 3.37E-02 or 0.0337 mRem. 3.13E-02 mRem or 0.0313 mRem Surface, drinking, and well water samples were analyzed for concentrations of tritium and gamma-emitting nuclides. Drinking water samples were also analyzed for concentrations of gross beta and iodine-131 (1-131 ). No fission or activation products were detected. No tritium or gross beta activity was detected and the required lower limit of detection (LLD) was met.

Fish and shoreline sediment samples were analyzed for concentrations of gamma-emitting nuclides. No fission or activation products were detected in fish or shoreline sediment samples.

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

Iodine-131 analyses were perfonned on weekly air samples. All results were less than the lower limit of detection for 1-131.

High sensitivity 1-131 analyses and gamma analyses were performed on cow milk samples. All results were below the required LLDs for 1-131. Concentrations of naturally-occurring K-40 were consistent with those detected in previous years.

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.

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

Environmental gamma radiation measurements were performed quarter1y using Dosimeters of Legal Record (DLR). Levels detected were consistent with those observed in previous years.

There was no other errata data for 2022.

E-1

Intentionally left blank APPENDIX F ANNUAL RADIOLOGICAL GROUNDWATER PROTECTION PROGRAM REPORT (ARGPPR)

Intentionally Left Blank ARGPPR Table Of Contents I. Summary and Conclusions .............................................................................................. 1 II. Introduction ..................................................................................................................... 2 A. Objectives of the RGPP ....................................................................................... 2 B. Implementation of the Objectives ........................................................................ 2 C. Program Description ............................................................................................ 3 D. Characteristics of Tritium (H-3) ........................................................................... 3 Ill. Program Description ...................................................................................................... 5 A. Sample Analysis .................................................................................................. 5 B. Data Interpretation ............................................................................................... 5 C. Background Analysis ........................................................................................... 6

1. Background Concentrations of Tritium ........................................................... 6 IV. Results and Discussion ................................................................................................. 8 A. Program Exceptions ............................................................................................ 8 B. Program Changes ............................................................................................... 8 C. Groundwater Results .......................................................................................... 8 D. Surface Water Results ........................................................................................ 8 E. Precipitation Water Results (Recapture) ............................................................. 9 F. Summary of Results - Inter-laboratory Comparison Program .............................. 9 G. Errata Data ........................................................................................................... 9 H. Leaks, Spills and Releases .................................................................................. 9 I. Trends .................................................................................................................... 9 J. Investigations ....................................................................................................... 9 K. Actions Taken ....................................................................................................... 9

ARGPPR Appendices Appendix A Location Designation of the Annual Radiological Groundwater Protection Program Report {ARGPPR)

Tables Table A-1 Radiological Groundwater Protection Program - Sampling Locations, Clinton Power Station, 2022 Figures

Figure A-1 Onsite Sampling Locations at Clinton Power Station Figure A-2 Sampling Locations South of Clinton Power Station Figure A-3 Sampling Locations East of Clinton Power Station Figure A-4 Recapture Sampling Locations of Clinton Power Station Appendix B Data Tables of the Annual Radiological Groundwater Protection Program Report (ARGPPR)

Tables Table B-1.1 Concentrations of Tritium and Strontium in Groundwater Samples Collected in the Vicinity of Clinton Power Station, 2022 Table B-1.2 Concentrations of Gamma Emitters in Groundwater Samples Collected in the Vicinity of Clinton Power Station, 2022 Table B-1.3 Concentrations of Hard To Detects in Groundwater Samples Collected in the Vicinity of Clinton Power Station, 2022 Table B-I1.1 Concentrations of Tritium in Surface Water Samples Collected in the Vicinity of Clinton Power Station, 2022 Table B-111.1 Concentrations of Tritium in Precipitation Water Samples Collected in the Vicinity of Clinton Power Station, 2022 ii

I. Summary and Conclusions In 2006, Constellation, formerly Exelon, instituted a comprehensive program to evaluate the impact of station operations on groundwater and surface water in the vicinity of Clinton Power Station (CPS). This evaluation involved numerous station personnel and contractor support personnel. This report covers groundwater and surface water samples, collected outside of the Licensee required Off-Site Dose Calculation Manual (ODCM) requirements, both on and off station property in 2022. During that time period, 114 analyses were performed on 72 samples from 29 locations. The monitoring was conducted in four phases.

In assessing all the data gathered for this report, it was concluded that the operation of CPS had no adverse radiological impact on the environment, and there are no known active releases into the groundwater or surface water at CPS. No program changes occurred during the sampling year of 2022.

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 NUREG-1302 in any of the groundwater or surface water samples. In the case of tritium, Constellation specified that the independent laboratory achieve a lower limit of detection ten times lower than that required by the United States Environmental Protection Agency (USEPA)

. regulation.

Strontium-89 (Sr-89) was not detected in any samples. Strontium-90 (Sr-90) was not detected in any samples.

Gross Alpha in the suspended fraction was not detected in any samples. Gross Alpha in the dissolved fraction was detected in one sample.

Tritium was not detected in any of the groundwater samples at concentrations greater than the United States Environmental Protection Agency (USEPA) drinking water standard (and the Nuclear Regulatory Commission Reporting Limit) of 20,000 pCi/L. Background levels of tritium were detected at concentrations greater than the self-imposed LLD of 200 pCi/L in 4 of 17 groundwater monitoring locations. The detected tritium concentrations ranged from 188 +/- 122 pCi/L to 383 +/- 133 pCi/L. Tritium was detected in 7 of 25 precipitation water samples with concentrations ranging from 202 +/- 121 pCi/L to 464 +/- 134 pCi/L.

II. Introduction The Clinton Power Station (CPS), consisting of one approximately 1,120 MW gross electrical power output boiling water reactor is located in Harp Township, DeWitt County, Illinois. CPS is owned and operated by Constellation and became operational in 1987. Unit No. 1 went critical on February 27, 1987. The site encloses approximately 13,730 acres. This includes the 4,895 acre, man-made cooling lake and about 452 acres of property not owned by Constellation.

The plant is situated on approximately 150 acres. The cooling water discharge flume, which discharges to the eastern arm of the lake, occupies an additional 130 acres. Although the nuclear reactor, supporting equipment and associated electrical generation and distribution equipment lie in Harp Township, portions of the aforementioned 13,730 acre plot reside within Wilson, Rutledge, DeWitt, Creek, Nixon and Santa Anna Townships.

This report covers those analyses performed by Teledyne Brown Engineering (TBE) on samples collected in 2022.

A. Objectives of the Radiological Groundwater Protection Program (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 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 Clinton Power Station as discussed below:

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

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

3. Clinton Power Station will continue to perform routine sampling and radiological analysis of water from selected locations.

4. Clinton Power Station has procedures to identify and report new leaks, spills, or other detections with potential radiological significance in a timely manner.

5. Clinton Power 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 Figures A-1, A-2, A-3, and A-4 Appendix A.

Groundwater, Surface Water and Precipitation Water Samples of water are collected, managed, transported and analyzed in accordance with approved procedures following regulatory methods. Groundwater, surface water, and precipitation water are 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 and inter-laboratory cross-check programs, as well as nuclear industry audits. Station personnel review and evaluate all analytical data deliverables after initial review by the contractor.

Analytical data results are reviewed by both station personnel and an independent hydrogeologist for adverse trends or changes to hydrogeologic conditions.

D. Characteristics of Tritium (H-3)

Tritium (chemical symbol H-3) is a radioactive isotope of hydrogen. The most common form of tritium is tritium oxide, which is also called "tritiated water." The chemical properties of tritium are essentially those of ordinary hydrogen.

Tritiated water behaves the same as ordinary water in both the environment and the body. Tritium can be taken into the body by drinking water, breathing air, eating food, or absorption through skin. Once tritium enters the body, it disperses quickly and is uniformly distributed throughout the body. Tritium is excreted primarily through urine with a clearance rate characterized by an effective biological half-life of about 14 days. Within one month or so after ingestion, essentially all tritium is cleared. Organically bound tritium (tritium that is incorporated in organic compounds) can remain in the body for a longer period.

Tritium is produced naturally in the upper atmosphere when cosmic rays strike air molecules. Tritium is also produced during nuclear weapons explosions, as a by-product in reactors producing electricity, and in special production reactors, where the isotopes Lithium-? (Li-7) and/or Boron-10 (B-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 (He-3). 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 beta 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 Clinton Power Station RGPP in 2022. In order to achieve the stated objectives, the current program includes the following analyses:

1. Concentrations of gamma emitters in groundwater

2. Concentrations of strontium in groundwater

3. Concentrations of tritium in groundwater and precipitation samples

4. Concentrations of gross alpha (dissolved and suspended) in groundwater

8. Data Interpretation The radiological data collected prior to Clinton Power Station becoming operational were used as a baseline with which these operational data were compared. For the purpose of this report, Clinton Power 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 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 is intended as an a priori (a before the fact) estimate of a system (including instrumentation, procedure and sample type) and not as an a posteriori (after the fact) criteria for the presence of activity. All analyses were designed to achieve the required CPS detection capabilities for environmental sample.analysis.

The minimum detectable concentration (MDC) is defined above with the exception that the measurement is an a posteriori (after the fact) estimate of the presence of activity.

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. Constellation 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. Constellation reports the TPU by following the result with plus or minus +/- the estimated sample standard deviation, as TPU, that is obtained by propagating all sources of analytical uncertainty in measurements.

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

C. Background Analysis 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, milk, and vegetation. The results of the monitoring were detailed in the report entitled, Environmental Radiological Monitoring for Clinton Power Nuclear Power Station, Illinois Power Company, Annual Report 1987, May 1988.

The pre-operational REMP contained analytical results from samples collected from the surface water and groundwater.

1. Background Concentrations of Tritium -

The purpose of the following discussion is to summarize background measurements of tritium in various media performed by others:

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 Sr-90 comes from the former atmospheric testing of thermonuclear weapons.

Levels of tritium in precipitation increased significantly during the 1950s and early 1960s, and later with additional testing, resulting in the release of significant amounts of tritium to the atmosphere.

The Canadian heavy water nuclear power reactors, other commercial power reactors, nuclear research and weapons production continue to influence tritium concentrations in the environment.

b. Precipitation Data Precipitation samples are routinely collected at stations around the world for the analysis of tritium and other radionuclides. Two publicly available databases that provide tritium concentrations in precipitation are Global Network of Isotopes in Precipitation (GNIP) and USEPA's RadNet database. GNIP provides tritium precipitation concentration data for samples collected world wide from 1960 to 2006. RadNet provides tritium precipitation concentration data for samples collected at stations through out the U.S. from 1960 up to and including 2006. Based on GNIP data for sample stations located in the U.S. Midwest, tritium concentrations peaked around 1963. This peak, which approached 10,000 pCi/L for some stations, coincided with the atmospheric testing of thermonuclear weapons. Tritium concentrations in surface water showed a sharp decline up until 1975, followed by a gradual* decline since that time. Tritium concentrations in Midwest precipitation have typically been below 100 pCi/L since around 1980. Tritium concentrations in wells may still be above the 200 pCi/L detection limit from the external causes described above.

c. Surface Water Data Tritium concentrations are routinely measured in Clinton Lake.

According to the USEPA, surface water data typically has an uncertainty +/- 70 to 100 pCi/L 95% confidence bound on each given measurement. Therefore, the typical background *data provided may be subject to measurement uncertainty of approximately +/- 70 to 100 pCi/L.

The radio-analytical laboratory is counting tritium results to a Constellation 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. . Program Exceptions

1. Sample Anomalies There were no sample anomalies in 2022.

2. Missed Samples There were no missed samples in 2022.

B. Program Changes There were no program changes in 2022.

C. Groundwater Results Groundwater Baseline samples were collected from off-site wells during four (4) phases at the station. Analytical results are discussed below:

Tritium Samples from seventeen locations were analyzed for tritium activity.

Tritium values ranged from below the Constellation-imposed LLD of 200 pCi/L to 383 pCi/L. (Table B-1.1 Appendix B)

Strontium Sr-89 was not detected in any of the samples analyzed and the required LLD of 10 pCi/L was met. Sr-90 was also not detected in any of the samples analyzed and the required LLD of 1 pCi/L was met.

(Table B-1.1 Appendix B)

Gamma Emitters Analysis of gamma-emitting nuclides are required on a biennial basis and was not performed in 2022. (Table B-1.2, Appendix B)

Hard-to-Detect (HTD)

Hard-to-Detect analyses were performed on one sample in 2022. No HTD nuclides were detected and all MDC's were met. HTD analyses are performed on all wells biennially. (Table B-1.3 Appendix B)

D. Surface Water Results There were no surface water samples analyzed in 2022 since surface water locations were removed from the program in 2021.

(Table B-I1.1 Appendix B)

E. Precipitation Water Results (Recapture)

Precipitation water samples from 11 locations were analyzed for tritium activity. Tritium was detected in seven samples at a concentration range of 202 pCi/L - 464 pCi/L. (Table B-111.1, Appendix B)

F. Summary of Results - Inter-Laboratory Comparison Program Inter-Laboratory Comparison Program results for TBE are presented in Section IV, Part G in the Annual Radiological Environmental Operating Report.

G. Errata Data There was no Errata Data for 2022.

H. Leaks, Spills, and Releases There were no reportable leaks, spills or releases in 2022.

I. Trends No trends have been identified in 2022.

J. Investigations Currently no investigations are on-going.

K. Actions Taken

1. Compensatory Actions There have been no station events requiring compensatory actions at the Clinton Power Station in 2022.

2. Installation of Monitoring Wells No new wells were installed during the 2022.

3. Actions to Recover/Reverse Plumes No actions were required to recover or reverse groundwater plumes.

Intentionally left blank APPENDIX A LOCATION DESIGNATION OF THE ANNUAL RADIOLOGICAL GROUNDWATER PROTECTION PROGRAM REPORT (ARGPPR)

Intentionally Left Blank TABLE A-1: Radiological Groundwater Protection Program - Sampling Locations, Clinton Power Station, 2022 Site Site Type B-3 Monitoring Well MW-CL-1 Monitoring Well MW-CL-2 Monitoring Well MW-CL-12I Monitoring Well MW-CL-13I Monitoring Well MW-CL-13S Monitoring Well MW-CL-14S Monitoring Well MW-CL-15I Monitoring Well MW-CL-15S Monitoring Well MW-CL-16S Monitoring Well MW-CL-17S Monitoring Well MW-CL-18I Monitoring Well MW-CL-18S Monitoring Well MW-CL-19S Monitoring Well MW-CL-20S Monitoring Well MW-CL-21S Monitoring Well MW-CL-22S Monitoring Well RG-E Precipitation Water RG-ENE Precipitation Water RG-N Precipitation Water RG-NE Precipitation Water RG-NNW Precipitation Water RG-S Precipitation Water RG-SE Precipitation Water RG-SW Precipitation Water RG-SW2 Precipitation Water RG-W Precipitation Water RG-WNW Precipitation Water RG-WSW Precipitation Water A-1

A; Fig_ure a 6iinton Power Station Onsite Sampling Locations

2 Sampling LocationsFigure South Aof- Chn

. t on Power Station

0 100 200

--===-~=::::iFeet FigureA-3 Sampling Locations East of Clinton Power Station

0 FigureA-4 Recapture Sampling Locations of Clinton Power Station A-5

~---------------------------~----------------- -- -- - -- -- -

Intentionally Left Blank

APPENDIX B DATA TABLES

Intentionally left blank TABLE B-1.1 CONCENTRATIONS OF TRITIUM AND STRONTIUM IN GROUNDWATER SAMPLES COLLECTED IN THE VICINITY OF CLINTON POWER STATION, 2022 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION SITE DATE H-3 Sr-89 Sr-90 B-3 06/01/22 < 169 MW-CL-1 06/01/22 < 182 MW-CL-2 06/01/22 < 198 MW-CL-12I 02/16/22 < 183 MW-CL-12I 06/01/22 < 188 < 7.1 < 0.9 MW-CL-12I 09/07/22 < 185 MW-CL-12I 11/01/22 < 193 MW-CL-13I 06/01/22 < 181 MW-CL-13S 02/16/22 309 +/- 133 MW-CL-13S 02/16/22 < 184 MW-CL-13S 06/01/22 < 189 < 7.8 < 0.9 MW-CL-13S 09/07/22 < 183 MW-CL-13S 11/01/22 205 +/- 131 MW-CL-13S 11/01/22 < 183 MW-CL-14S 02/16/22 383 +/- 133 MW-CL-14S 02/16/22 < 193 MW-CL-14S 06/02/22 < 185 < 7.5 < 1.0 MW-CL-14S 09/08/22 188 +/- 122 MW-CL-14S 11/02/22 224 +/- 131 MW-CL-14S 11/02/22 345 +/- 125 MW-CL-15I 06/01/22 < 186 MW-CL-15S 06/01/22 < 184 MW-CL-16S 02/16/22 314 +/- 135 MW-CL-16S 02/16/22 236 +/- 134 MW-CL-16S 06/02/22 < 191 < 6.4 < 0.9 MW-CL-16S 09/08/22 < 174 MW-CL-16S 11/02/22 < 191 MW-CL-17S 02/16/22 < 198 MW-CL-17S 06/02/22 < 179 < 8.1 < 0.8 MW-CL-17S 09/08/22 < 189 MW-CL-17S 11/02/22 < 180 MW-CL-18I 02/16/22 < 199 MW-CL-18I 06/02/22 < 183 < 9.3 < 1.0 MW-CL-18I 09/08/22 < 170 MW-CL-18I 11/02/22 < 198 MW-CL-18S 02/16/22 < 185 MW-CL-18S 06/02/22 < 187 < 8.8 < 0.9 MW-CL-18S 09/08/22 < 184 MW-CL-18S 11/02/22 < 197 MW-CL-19S 03/23/22 < 188 MW-CL-19S 06/01/22 < 191 < 7.0 < 0.8 MW-CL-19S 09/07/22 < 191 MW-CL-19S 11/01/22 < 193 MW-CL-20S 06/01/22 < 182 MW-CL-21S 02/16/22 < 189 MW-CL-21S 06/01/22 < 182 < 8.6 < 0.9 MW-CL-21S 09/07/22 < 181 MW-CL-21S 11/01/22 193 +/- 121 MW-CL-21S 11/01/22 < 179 MW-CL-22S 02/16/22 < 179 MW-CL-22S 06/02/22 < 187 < 6.7 < 0.9 MW-CL-22S 09/08/22 < 188 MW-CL-22S 11/02/22 221 +/- 126 MW-CL-22S 11/02/22 232 +/- 127 8-1

Table B-1.2 CONCENTRATIONS OF GAMMA EMITTERS IN GROUNDWATER SAMPLES COLLECTED IN THE VICINITY OF CLINTON POWER STATION, 2022 RESULTS IN UNITS OF PCI/LITER + SIGMA No samples collected or analyzed for gamma emitters in 2022 CJ I

I\)

TABLE B-1.3 CONCENTRATIONS OF HARD TO DETECTS IN GROUNDWATER SAMPLES COLLECTED IN THE VICINITY OF CLINTON POWER STATION, 2022 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION SITE DATE Am-241 Cm-242 Cm-243/244 Pu-238 Pu-239/240 U-234 U-235 U-238 MW-CL-19S 06/01/22 < 0.02 < 0.02 < 0.02 < 0.08 < 0.05 < 0.05 < 0.06 < 0.05 CJ I

c,J

TABLE 8-11.1 CONCENTRATIONS OF TRITIUM IN SURFACE WATER SAMPLES COLLECTED IN THE VICINITY OF CLINTON POWER STATION, 2022 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA There were no Surface Water Samples analyzed in 2022 B-4

TABLE B-111.1 CONCENTRATIONS OF TRITIUM IN PRECIPITATION WATER SAMPLES COLLECTED IN THE VICINITY OF CLINTON POWER STATION, 2022 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION SITE DATE H-3 RG-E 03/01/22 < 184 RG-E 11/09/22 < 185 RG-ENE 03/01/22 211 +/- 118 RG-ENE 11/09/22 219 +/- 119 RG-ESE 03/01/22 < 190 RG-ESE 11/09/22 < 190 RG-N 03/01/22 202 +/- 121 RG-N 11/09/22 < 183 RG-NE 03/01/22 < 175 RG-NE 11/09/22 < 195 RG-NNW 03/01/22 236 +/- 131 RG-NNW 11/09/22 253 +/- 123 RG-S 03/01/22 < 189 RG-S 11/09/22 < 178 RG-SE 03/01/22 < 198 RG-SE 11/09/22 < 192 RG-SW 03/01/22 < 187 RG-SW 11/09/22 < 192 RG-SW2 11/30/22 464 +/- 134 RG-W 03/01/22 < 192 RG-W 11/09/22 < 187 RG-WNW 03/01/22 < 184 RG-WNW 11/09/22 223 +/- 128 RG-WSW 03/01/22 < 155 RG-WSW 11/09/22 < 200 B-5

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