U-604706, Annual Radiological Environmental Operating Report

Annual Radiological Environmental Operating Report

ML22123A200
Person / Time
Site:	Clinton
Issue date:	04/09/2022
From:	Exelon Generation Co, Teledyne Brown Engineering Environmental Services
To:	Office of Nuclear Reactor Regulation
References
U-604706
Download: ML22123A200 (108)

Text

..,

.,, Exelon Generation.

January 01, 2021- December 31, 2021 ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERA TING REPORT CLINTON POWER STATION - DOCKET NUMBER 50-461 Prepared by:

Teledyne Brown Engineering Environmental Services April 2022

Intentionally Left Blank Table Of Contents I. Summary and Conclusions .............................................................................................. 5 II. Introduction ...................................................................................................................... 6 A. Objectives of the REMP ....................................................................................... 6 B. Implementation of the Objectives ........................................................................ 6 Ill. Program Description ....................................................................................................... 7 A. Sample Collection ................................................................................................ 7 B. Sample Analysis .................................................................................................. 8 C. Data Interpretation ............................................................................................... 9 D. Program Exceptions .......................................................................................... 10 E. Program Changes ............................................................................................. 12 IV. Results and Discussion ............................................................................................... 13 A. Aquatic Environment ......................................................... *................................ 13

1. Surface Water ......................................................................................... 13

2. Drinking Water ........................................................................................ 13

3. Well Water .............................................................................................. 14

4. Fish ......................................................................................................... 14

5. Shoreline Sediment. ................................................................................ 14 B. Atmospheric Environment ................................................................................. 15

1. Airborne .................................................................................................. 15

a. Air Particulates ............................................................................. 15

b. Airborne Iodine ............................................................................. 15

2. Terrestrial .....................................*........................................................... 15

a. Milk .. '. .....................................................................................:...... 15

b. Food Products .............................................................................. 16

c. Grass ............................................................................................ 16 C. Ambient Gamma Radiation ............................................................................... 16 D. Independent Spent Fuel Storage Installation .................................................... 17 E. Land Use Survey ............................................................................................... 17 F. Errata Data ......................................................................................................... 18 G. Summary of Results - Inter-laboratory Comparison Program .......................... 18 V. References ................................................................................................................... 21

Appendices Appendix A Radiological Environmental Monitoring Report Summary Tables Table A-1 Radiological Environmental Monitoring Program Annual Summary for the Clinton Power Station, 2021 Appendix B Location Designation, Distance & Direction, and Sample Collection &

Analytical Methods Tables Table 8-1 Radiological Environmental Monitoring Program - Sampling Locations, Distance and Direction, Clinton Power Station, 2021 Table 8-2 Radiological Environmental Monitoring Program - Summary of Sample Collection and Analytical Methods, Clinton Power Station, 2021 Figures Figure 8-1 Environmental Sampling Locations Within One Mile of the Clinton Power Station, 2021 Figure 8-2 Environmental Sampling Locations Between One and Two Miles of the Clinton Power Station, 2021 Figure 8-3 Environmental Sampling Locations Between Two and Five Miles of the Clinton Power Station, 2021 Figure 8-4 Environmental Sampling Locations Greater Than Five Miles from of the Clinton Power Station, 2021 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, 2021 Table C-1.2 Concentrations of Tritium in Surface Water Samples Collected in the Vicinity of Clinton Power Station, 2021 Table C-1.3 Concentrations of Gamma Emitters in Surface Water Samples Collected in the Vicinity of Clinton Power Station, 2021 Table C-11.1 Concentrations of Gross Beta in Drinking Water Samples Collected in the Vicinity of Clinton Power Station, 2021 ii

Table C-II.2 Concentrations of Tritium in Drinking Water Samples Collected in the Vicinity of Clinton Power Station, 2021 Table C-I1.3 Concentrations of 1-131 in Drinking Water Samples Collected in the Vicinity of Clinton Power Station, 2021 Table C-I1.4 Concentrations of Gamma Emitters in Drinking Water Samples Collected in the Vicinity of Clinton Power Station, 2021 Table C-II1.1 Concentrations of Tritium in Well Water Samples Collected in the Vicinity of Clinton Power Station, 2021 Table C-II1.2 Concentrations of Gamma Emitters in Well Water Samples Collected in the Vicinity of Clinton Power Station, 2021 Table C-IV.1 Concentrations of Gamma Emitters in Fish Samples Collected in the Vicinity of Clinton Power Station, 2021 Table C-V.1 Concentrations of Gamma Emitters in Sediment Samples Collected in the Vicinity of Clinton Power Station, 2021 Table C-Vl.1 Concentrations of Gross Beta in Air Particulate Samples Collected in the Vicinity of Clinton Power Station, 2021 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, 2021 Table C-Vl.3 Concentrations of Gamma Emitters in Air Particulate Samples Collected in the Vicinity of Clinton Power Station, 2021.

Table C-Vll.1 Concentrations of 1-131 in Air Iodine Samples Collected in the Vicinity of Clinton Power Station, 2021 Table C-Vlll.1 Concentrations of 1-131 in Milk Samples Collected in the Vicinity of Clinton Power Station, 2021 Table C-Vlll.2 Concentrations of Gamma Emitters in Milk Samples Collected in the Vicinity of Clinton Power Station, 2021 .

Table C-IX.1 Concentrations of Gamma Emitters in Vegetation Samples Collected in the Vicinity of Clinton Power Station, 2021 Table C-IX.2 Concentrations of Gamma Emitters in Grass Samples Collected in the Vicinity of Clinton Power Station, 2021 Table C-X.1 Quarterly DLR Results for Clinton Power Station, 2021 iii

Figures Figure C-1 Mean Monthly Gross Beta Concentration in Air Particulate Samples Collected in the Vicinity of CPS, 2021 Figure C-2 Mean Quarterly Ambient Gamma Radiation Levels (DLR) in the Vicinity of CPS, 2021 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) 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.

Surface, drinking, and well wat~r 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 1,140 MW gross electrical power output boiling water reactor is located in Harp Township, DeWitt County, Illinois. CPS is owned and operated by Exelon 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 Exelon. 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, 2021 through December 31 , 2021 .

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

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

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

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

1. Identifying significant exposure pathways.

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

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

Ill. Program Description A. Sample Collection This section describes the general collection methods used by Environmental Inc. Midwest Labs (EIML) to obtain environmental samples for the CPS REMP in 2021. 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 and 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 and 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 and CL-114).

CL-11 represents 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 2021. 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-0133, "Preparation of Radiological Effluent Technical Specifications for Nuclear Power Plants", October 1978, 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, ma/function 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

a. During weekly ODCM air sampling surveillances, the Environmental, Inc. vendor identified that there was a (possible) power outage for the following dates/locations:

01/06/21 CL-1, CL-4, CL-6, CL-8, CL-94 01/27/21 CL-7, CL-7 02/10/21 CL-4, CL-6, CL-15 02/17/21 CL-15 03/24/21 CL-7, CL-8 04/04/21 C L-3 04/14/21 CL-15 06/30/21 CL-1 08/04/21 CL-2 (sampler ran only 57.7 hours8.101852e-5 days <br />0.00194 hours <br />1.157407e-5 weeks <br />2.6635e-6 months <br />), CL-3 10/13/21 CL-2, CL-3, CL-4, CL-6

b. During weekly ODCM air sampling surveillances, the Environmental, Inc. vendor identified a broken timer for the CL-3 location on 11/24/21 and the runtime was estimated.

2. OSL Dosimetry Location CL-47 Sample found missing during the monthly check up on 01/27/21, probably removed accidently during tree-clearing activities in the area.

3. Vegetation Samples (AR 04453759)

a. July Garden CL-115 - only cabbage and Swiss chard were available for sampling; Garden CL-118 - only broccoli and Swiss chard were available for sampling. No differing substitute was available and additional vegetation planted (lettuce and kale).

b. August Garden CL~115 - only cabbage and Swiss chard were available for sampling and soybean leaves were collected as a third substitute; Garden CL-118 - only broccoli and Swiss chard were available for sampling and no differing substitute was available. No additional vegetation available to plant (past planting season).

c. September Gardens CL-114 & CL-115 - only cabbage and Swiss chard were available for sampling; Garden CL-118 - only broccoli and Swiss chard were available for sampling. No differing substitute was available and no further actions taken (end of season).

4. Surface Water Location CL-90 During the 10/13/21 weekly check, the vendor observed that the compositor had less than the weekly composite volume for the monthly analysis. A supplemental grab sample was obtained from the process stream and added to the monthly collection container. The lower sample volume was due to a power outage (IR 4451945).

5. Water Compositor Location CL-99SL This non-ODCM compositor was flooded at some point due to the most recent storms. This location is approximately 3.5 miles upstream from the station and serves as an additional control (background) water sampler to compare against the ODCM Composite Sampler CL-90. It was unlikely that the pump and power were capable of supplying the 20-ml aliquot sample per hour. This would affect the June composite sample. Representative grabs samples were taken instead. (07/07/21)

Throughout 2021, 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-03 (08/04/21)

The sampler ran only for 56.3 hours3.472222e-5 days <br />8.333333e-4 hours <br />4.960317e-6 weeks <br />1.1415e-6 months <br /> - no power at the station. The sample was taken but no volume could be determined.

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 There were no program changes in 2021.

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-I1.1, 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-I1.4, Appe?dix 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-II1.1, 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-07B 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, CL-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 5 to 41 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 35 E-3 pCi/m 3 with a mean of 19 E-3 pCi/m 3 . The results from the Control h:>cation (Group Ill) ranged from 8 to 34 E-3 pCi/m 3 with a mean of 20 E-3 pCi/m 3 . Comparison of the 2021 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 2021 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 Broad leaf 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 216 OSLO measurements were made in 2021. The average dose from the inner ring was 18.6 mRem/quarter. The average dose from the outer ring was 19.1 mRem/quarter. The average dose from the special interest group was 19.0 mRem/quarter. The average dose from the supplemental group was 17.6 mRem/quarter. The quarterly measurements ranged from 5.5 to 22.1 mRem/quarter.

The inner ring and outer ring measurements compared well to the Control Station, CL-11, which ranged from 17.0 to 17.7 mRem/quarterwith an average measurement of 17.4 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 Exelon to comply with Clinton's Offsite Dose Calculation Manual, section 8.0. The report to CPS was dated October 19, 2021. 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. 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 3.46 >8 4 ENE 2.86 3.45 >8 5 E 1.67 3.95 >8 6 ESE 5.14 >8 >8 7 SE 4.44 >8 >8 8 SSE 2.90 4.45 >8 9 S 4.78 >8 >8 10SSW 4.68 >8 >8 11 SW 1.17 >8 >8 12WSW 3.62 3.66 4.32 13W 1.95 3.22 >8 14WNW 2.63 2.63 >8 15 NW 2.65 4.70 >8 16NNW 2.05 2.05 2.05 F. Errata Data There was no errata data for 2021.

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 TSE laboratory, 146 out of 154 analyses performed met the specified acceptance criteria. Seven analyses did not meet the specified acceptance criteria for the following reasons and were addressed through the TBE Corrective Action Program. A summary is found below:

1. The ERA MRAD March 2021 Water Fe-55 result was evaluated as Not Acceptable. The reported value for Fe-55 was 579 pCi/L and the known result was 275 pCi/L (acceptance range 162 - 400). When reviewing the original sample data, it was found that the carrier yield was 52.6% (lower than typical water samples). Looking at the etched plate that was counted, it appeared that some loss of sample could have occurred. The sample was logged for reanalysis and used as the workgroup duplicate. The results were acceptable at 197 and 221 respectively. Yields were 97.4% and 105.7% and the plated samples were centered with no apparent loss of sample. The loss of sample during plating resulted in a low yield which produced an artificially high sample result. (NCR 21-01)

2. The MAPEP February 2021 AP Gross Alpha result was evaluated as Not Acceptable. The reported value was 0.371 Sq/sample and the known result was 1. 77 Sq/sample (acceptance range 0.53 - 3.01 ). A similar failure had occurred several years prior due to the filter being placed with the wrong side up on the detector. At that time, a small dot was placed on the top of the filter.

prior to removal from the package to indicate the correct side for counting. The current sample was still in the detector when the result was received (dot side facing the detector). The sample was recounted with a similar result and was flipped and recounted. The flipped result was 0.661 Sq/sample, within the acceptable range. Because TBE cannot rely on receiving correct packaging from the provider, MAPEP AP cross-checks will be counted on both sides going forward. NOTE: The August sample had the same packaging issue (upside down). (NCR 21-02)

3. The MAPEP February 2021 soil Ni-63 was evaluated as Not Acceptable. The reported value was 310 Bq/kg and the known result was 689 (acceptance range 482 - 896). All workgroup QC was reviewed with no anomalies. The analytical procedure had been revised prior to this analysis to eliminate added interferences. The sample yield was >100%, indicative of incomplete separation from interferences, leading to a lower result. The procedure was again revised after acceptable results were obtained. (NCR 21-03)

4. The ERA October 2021 water Gross Beta result was evaluated as Not Acceptable. The reported value was 63.0 pCi/L and the known was 55. 7 (acceptance range 38.1 - 62.6) or 113% of the known. The 2-sigma error was 6.8, placing the reported result well within the acceptable range. All QA was reviewed with no anomalies. A follow-up Quick Response cross-check was analyzed with a 120% ratio (see item 7). (NCR 21-10)

5. The ERA October 2021 water Tritium result was evaluated as Not Acceptable.

The reported value was 13,800 pCi/L and the known was 17,200 (acceptance range 15,000 - 18,900). The 2-sigma error was 1,430, placing the result within the acceptable range. TBE's internal QC acceptance is 70% - 130%, while ERA's for this sample was 87% - 110%. All QA was reviewed with no anomalies. A Quick Response follow-up cross-check was analyzed with a result of 17,500 pCi/L (known 17,800 pCi/L). (NCR 21-11)

6. The MAPEP August 2021 soil Ni-63 result was evaluated as Not Acceptable.

The reported value was 546 Bq/kg and the known result was 1,280 Bq/kg (acceptance range 896 - 1,664). All QC was reviewed and no anomalies found.

The procedure revision to remove added MAPAP interferences was ineffective for this sample. No client soil matrix samples were analyzed for Ni-63 in 2020 or 2021. The root cause investigation is still ongoing at this time. (NCR 21-13)

7. The ERA December 2021 Quick Response water Gross Beta result was evaluated as Not Acceptable. The reported value was 47.6 pCi/L and the known was 39.8 pCi/L or 120% of the known (acceptance range of 26.4 - 47.3). The 2-sigma error was 6.1, placing the reported result well within the acceptable range. All QA was reviewed with no anomalies. The original sample was recounted on a different detector with a result of 40.3 +/- 6.27 pCi/L. The "failure" of this sample and the RAD-127 was due to the narrow upper acceptance ranges assigned (119% and 112%) (NCR 21-14)

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 Radia.tion 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 Commission, 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 (Norm 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.

APPENDIX A RADIOLOGICAL ENVIRONMENTAL MONITORING REPORT

SUMMARY

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

SUMMARY

FOR THE CLINTON POWER STATION, 2021 NAME OF FACILITY: CLINTON POWER STATION DOCKET NUMBER: 50-461 LOCATION OF FACILITY: DEWITT COUNTY IL REPORTING PERIOD: 2021 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 SURFACE WATER 1-131 (LOW LVL) 12 1. <LLD NA 0 (PCI/LITER)

H-3 16 2000 <LLD <LLD 0 GAMMA 48 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-8 12 4 <LLD NA 0 (PCl!LITER)

H-3 4 2000 <LLD NA 0 1-131 (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) Fraction of detectable measurement are indicated in parentheses.

TABLE A-1 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANNUAL

SUMMARY

FOR THE CLINTON POWER STATION, 2021 NAME OF FACILITY: CLINTON POWER STATION DOCKET NUMBER: 50-461 LOCATION OF FACILITY: DEWITT COUNTY IL REPORTING PERIOD: 2021 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 (UNIT OF ANALYSIS ANALYSIS OF DETECTION (F) (F) (F) NAME REPORTED MEASUREMENT) PERFORMED PERFORMED {LLD) RANGE RANGE RANGE DISTANCE AND DIRECTION MEASUREMENTS WELL WATER H-3 12 2000 <LLD NA 0 (PCI/UTER)

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 I

I\J 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, 2021 NAME OF FACILITY: CLINTON POWER STATION DOCKET NUMBER: 50-461 LOCATION OF FACILITY: DEWITT COUNTY IL REPORTING PERIOD: 2021 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) (F) (F) NAME REPORTED MEASUREMEN1) 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 CO-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

)> BA-140 NA <LLD <LLD 0 I

c,) LA-140 NA <LLD <LLD 0 CE-144 NA <LLD <LLD 0 AIR PARTICULATE GR-B 519 10 19 20 21 CL-94 INDICATOR 0 (E-3 PC/ICU.METER) (467/467) (52/52) (52/52) OLD CLINTON ROAD 5-41 8-34 7-40 0.6 MILES E 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 <LLD 0 CS-137 60 <LLD <LLD 0 CE-141 NA <LLD <LLD 0 CE-144 NA <LLD <LLD 0 AIR IODINE GAMMA 519 (E-3 PC/ICU.METER) /-131 70 <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, 2021 NAME OF FACILITY: CLINTON POWER STATION DOCKET NUMBER: 50-461 LOCATION OF FACILITY: DEWITT COUNTY IL REPORTING PERIOD: 2021 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 MILK 1-131 (LOW LVL) 19 NA <LLD 0 (PCI/L/TER)

GAMMA 19 K-40 NA NA 1110 1110 CL-116 CONTROL 0 (19/19) (19/19) DEMENT DAIRY 818-1311 818- 1311 14 MILES WSW OF SITE MN-54 NA NA <LLD 0 CO-58 NA NA <LLD 0 FE-59 NA NA <LLD 0 CO-60 NA NA <LLD 0 l>I ZN-65 NA NA <LLD 0

.i:,.

NB-95 NA NA <LLD 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 WET) 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, 2021 NAME OF FACILITY: CLINTON POWER STATION DOCKET NUMBER: 50-461 LOCATION OF FACILITY: DEWITT COUNTY IL REPORTING PERIOD: 2021 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 (PCI/KG WE7) 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 CS-137 80 <LLD <LLD 0

~ BA-140 NA <LLD <LLD 0 c.n LA-140 NA <LLD <LLD 0 CE-144 NA <LLD <LLD 0 DIRECT RADIATION OSLD-QUARTERLY 216 NA 18.5 17.4 20.7 CL-55 INDICATOR 0 (M/LLI-ROENTGENIQTR.) (216/216) (4/4) (4/4) 5.5-22.1 17.0-17.7. 20.1 - 21.4 4.1 MILES SE (M) The Mean Values are calculated using the positive values. (F) Fraction of detectable measurement are indicated in parentheses.

Intentionally left blank APPENDIX 8 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, 2021 Location Location Description Distance & Direction From Site A. Surface Water CL-13 Salt Creek Bridge on Rt. 10 (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. WellWater 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 I 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 (antral) 50 miles S H. Food Products CL-114 Residence SSE of Site (Control) 12.5 miles SSE 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, 2021 Location Location Description Distance & Direction From Site J. Environmental Dosimetry - 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 0.8 miles WNW CL-35 0.7 miles 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 4.4 miles 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 4.5 miles WSW 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 miles W CL-81 4.5 miles WNW Special Interest CL-37 3.4 miles N CL-41 2.4 miles E CL-49 3.5 miles W CL-64 2.1 miles WNW CL-65 2.6 miles ENE CL-74 1.9 miles W CL-75 0.9 miles N 8-2

TABLE B-1: Radiological Environmental Monitoring Program - Sampling Locations, Distance and Direction Clinton Power Station, 2021 Location Location Description Distance & Direction From Site J. Environmental Dosimetry - 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 SE Control CL-11 16 miles S B-3

TABLE B-2: Radiological Environmental Monitoring Program - Summary of Sample Collection and Analytical Methods, Clinton Power Station, 2021 Sample Analysis Sampling Method Analytical 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 Monthly 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 throuah 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 Al2O3:C Landauer Landauer Incorporated Dosimetry Incorporated elements B-4

Figure B-1 Environmental Sampling Locations Within One Mile of the Clinton Power Station, 2021 B-5

Figure B-2 Environmental Sampling Locations Between One and Two Miles of the Clinton Power Station, 2021 8-6

Figure B-3 Environmental Sampling Locations between Two and Five Miles of the Clinton Power Station, 2021 B-7

Figure B-4 Environmental Sampling Locations Greater Than Five Miles of the Clinton Power Station, 2021 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, 2021 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION PERIOD CL-90 12/30/20 - 01/27/21 < 0.6 01/27/21 - 02/24/21 < 0.8 02/24/21 - 03/31/21 < 0.7 03/31/21 - 04/28/21 < 0.9 04/28/21 - 05/26/21 < 0.7 05/26/21 - 06/30/21 < 0.6 06/30/21 - 07/28/21 < 0.9 07/28/21 - 08/25/21 < 0.7 08/25/21 - 09/29/21 < 0.9 09/29/21 - 10/27/21 < 0.8 10/27/21 - 11/24/21 < 0.8 11/24/21 - 1_2/29/21 < 0.7 MEAN Table C-I.2 CONCENTRATIONS OF TRITIUM IN SURFACE WATER SAMPLES COLLECTED IN THE VICINITY OF CLINTON POWER STATION, 2021 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION PERIOD CL-90 CL-13 CL-91 CL-99 01/27/21 - 03/31/21 < 184 < 179 < 184 < 184 04/28/21 - 06/30/21 < 177 < 178 < 178 < 182 07/28/21 - 09/29/21 < 196 < 192 < 193 < 194 10/27/21 - 12/29/21 < 180 < 194 < 198 < 196 MEAN C-1

Table C-1.3 CONCENTRATIONS OF GAMMA EMITTERS IN SURFACE WATER SAMPLES COLLECTED IN THE VICINITY OF CLINTON POWER STATION, 2021 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-13 01/27/21 - 01/27/21 < 7 < 8 < 12 < 6 < 12 < 8 < 14 < 10 < 7 < 31 < 9 < 52 02/24/21 - 02/24/21 < 6 < 8 < 14 < 9 < 14 < 8 < 13 < 9 < 9 < 27 < 11 < 55 03/31/21 - 03/31/21 < 5 < 6 < 11 < 8 < 9 < 8 < 10 < 8 < 6 < 27 < 5 < 49 04/28/21 - 04/28/21 < 7 < 7 < 14 < 5 < 14 < 5 < 12 < 7 < 7 < 35 < 10 < 45 05/26/21 - 05/26/21 < 7 < 7 < 15 < 8 < 15 < 9 < 14 < 7 < 8 < 26 < 10 < 57 06/30/21 - 06/30/21 < 8 < 11 < 18 < 7 < 22 < 12 < 18 < 11 < 11 < 36 < 12 < 63 07/28/21 - 07/28/21 < 6 < 7 < 14 < 8 < 10 < 5 < 14 < 7 < 7 < 27 < 12 < 43 08/25/21 - 08/25/21 < 6 < 5 < 11 < 7 < 10 < 7 < 12 < 8 < 6 < 23 < 6 < 47 09/29/21 - 09/29/21 < 7 < 5 < 13 < 5 < 12 < 7 < 11 < 7 < 6 < 29 < 12 < 47 10/27/21 - 10/27/21 < 5 < 5 < 12 < 6 < 10 < 6 < 8 < 6 < 6 < 21 < 9 < 33 11/24/21 - 11/24/21 <4 <4 < 9 < 4 < 8 < 4 < 7 < 5 < 3 < 17 < 8 < 24 12/29/21 - 12/29/21 < 6 < 6 < 13 < 5 < 12 < 6 < 10 < 7 < 6 < 32 < 9 < 45 0I MEAN I\)

CL-90 12/30/20 - 01/27/21 < 6 < 6 < 11 < 6 < 12 < 5 < 9 < 6 < 5 < 19 < 8 < 41 01/27/21 - 02/24/21 < 8 < 7 < 14 < 9 < 18 < 9 < 16 < 7 < 8 < 34 < 14 < 48 02/24/21 - 03/31/21 < 6 < 9 < 15 < 8 < 13 < 7 < 12 < 7 < 7 < 32 < 12 < 52 03/31/21 - 04/28/21 < 6 < 6 < 12 <4 < 9 < 6 < 12 < 7 < 7 < 26 < 9 < 47 04/28/21 - 05/26/21 < 8 < 6 < 13 < 7 < 13 < 5 < 9 < 8 < 8 < 27 < 8 < 48 05/26/21 - 06/30/21 < 7 < 6 < 15 < 6 < 12 < 5 < 9 < 6 < 5 < 19 < 8 < 39 06/30/21 - 07/28/21 < 6 < 6 < 11 < 8 < 17 < 5 < 14 < 7 < 7 < 28 < 8 < 44 07/28/21 - 08/25/21 < 4 < 4 < 10 < 5 < 8 < 4 < 8 < 5 < 5 < 20 < 7 < 27 08/25/21 - 09/29/21 < 6 < 5 < 12 < 5 < 11 < 5 < 11 < 6 < 6 < 28 < 7 < 45 09/29/21 - 10/27/21 < 5 < 5 < 12 < 4 < 10 < 3 < 9 < 6 < 5 < 19 < 6 < 32 10/27/21 - 11/24/21 < 5 < 5 < 13 < 5 < 10 < 5 < 8 < 6 <4 < 27 < 7 < 42 11/24/21 - 12/29/21 < 8 < 7 < 17 < 5 < 17 < 8 < 14 < 10 < 8 < 36 < 10 < 59 MEAN

Table C-1.3 CONCENTRATIONS OF GAMMA EMITTERS IN SURFACE WATER SAMPLES COLLECTED IN THE VICINITY OF CLINTON POWER STATION, 2021 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 12/30/20 - 01/27/21 <4 < 5 < 9 < 9 < 13 < 5 < 9 < 5 < 5 < 20 < 8 < 34 01/27/21 - 02/24/21 <7 < 7 < 18 < 6 <8 < 8 < 14 <8 <7 < 36 < 10 < 54 02/24/21 - 03/31/21 < 6 < 7 < 13 < 8 < 9 < 8 < 12 < 8 < 8 < 31 < 12 < 49 03/31/21 - 04/28/21 < 6 < 6 < 14 < 7 < 13 < 6 < 10 < 7 < 7 < 26 < 10 < 35 04/28/21 - 05/26/21 < 7 < 8 < 18 < 6 < 13 < 7 < 14 < 8 < 7 < 32 < 10 < 40 05/26/21 - 06/30/21 < 7 < 5 < 13 < 6 < 14 < 7 < 10 < 7 < 6 < 24 < 8 < 45 06/30/21 - 07/28/21 < 7 < 7 < 13 < 6 < 13 < 5 < 11 < 7 < 8 < 29 < 9 < 37 07/28/21 - 08/25/21 < 6 < 5 < 13 < 7 < 13 < 6 < 10 < 6 < 6 < 24 < 6 < 46 08/25/21 - 09/29/21 < 5 < 7 < 11 < 5 < 12 < 6 < 11 < 7 < 6 < 26 < 8 < 46 09/29/21 - 10/27/21 < 6 < 6 < 14 < 8 < 11 < 7 < 12 < 8 < 8 < 24 < 11 < 38 10/27/21 - 11/24/21 < 6 < 5 < 13 < 5 < 11 < 5 < 10 < 6 < 7 < 28 < 8 < 40 11/24/21 - 12/29/21 < 7 <4 < 9 < 7 < 12 < 6 < 12 <7 < 6 < 27 < 9 < 47 0I MEAN c,J CL-99 12/30/20 - 01/27/21 < 5 < 4 < 10 < 6 < 9 < 5 < 9 < 5 < 5 < 18 < 5 < 36 01/27/21 - 02/24/21 < 5 < 5 < 10 <5 < 11 < 6 < 9 < 6 < 7 < 26 < 7 < 43 02/24/21 - 03/31/21 < 7 < 6 < 15 < 9 < 15 < 7 < 14 < 5 < 7 < 35 < 7 < 44 03/31/21 - 04/28/21 < 5 < 7 < 9 < 6 < 10 < 6 < 10 < 5 < 6 < 24 < 6 < 43 04/28/21 - 05/26/21 < 7 <4 < 14 <7 < 15 < 7 < 13 < 5 < 6 < 21 < 12 < 40 05/26/21 - 06/30/21 < 7 < 6 < 14 < 8 < 12 < 7 < 11 < 8 < 8 < 23 < 10 < 51 06/30/21 - 07/28/21 < 9 < 6 < 12 <7 < 16 < 8 < 13 < 8 < 8 < 28 < 10 < 55 07/28/21 - 08/25/21 < 8 < 7 < 14 <7 < 14 < 8 < 13 < 8 < 9 < 32 < 8 < 60 08/25/21 - 09/29/21 < 6 < 6 < 15 < 8 < 10 < 7 < 10 < 8 < 8 < 38 < 12 < 59 09/29/21 - 10/27/21 <4 < 5 < 9 < 6 < 9 < 5 < 8 < 5 < 5 < 22 < 5 < 35 10/27/21 - 11/24/21 < 6 < 7 < 15 < 6 < 13 < 7 < 12 < 6 < 7 < 27 < 12 < 38 11/24/21 - 12/29/21 < 6 < 7 < 16 <7 < 13 < 7 < 12 < 8 < 6 < 30 < 13 < 46 MEAN

Table C-I1.1 CONCENTRATIONS OF GROSS BETA IN DRINKING WATER SAMPLES COLLECTED IN THE VICINITY OF CLINTON POWER STATION, 2021 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION PERIOD CL-14 12/30/20 - 01/27/21 < 1.7 01/27/21 - 02/24/21 < 1.3 02/24/21 - 03/31/21 < 1.6 03/31/21 - 04/28/21 < 1.5 04/28/21 - 05/26/21 < 1.8 05/26/21 - 06/30/21 < 1.9 06/30/21 - 07/28/21 < 1.7 07/28/21 - 08/25/21 < 1.9 08/25/21 - 09/29/21 < 1.7 09/29/21 - 10/27/21 < 1.5 10/27/21 - 11/24/21 < 1.5 11/24/21 - 12/29/21 < 1.6 MEAN Table C-I1.2 CONCENTRATIONS OF TRITIUM IN DRINKING WATER SAMPLES COLLECTED IN THE VICINITY OF CLINTON POWER STATION, 2021 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION PERIOD CL-14 12/30/20 - 03/31/21 < 180 03/31/21 - 06/30/21 < 182 06/30/21 - 09/29/21 < 191 09/29/21 - 12/29/21 < 188 MEAN Table C-I1.3 CONCENTRATIONS OF I-131 IN DRINKING WATER SAMPLES COLLECTED IN THE VICINITY OF CLINTON POWER STATION, 2021 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION PERIOD CL-14 12/30/20 - 01/27/21 < 0.7 01/27/21 - 02/24/21 < 0.9 02/24/21 - 03/31/21 < 0.8 03/31/21 - 04/28/21 < 0.9 04/28/21 - 05/26/21 < 0.9 05/26/21 - 06/30/21 < 0.7 06/30/21 - 07/28/21 < 0.8 07/28/21 - 08/25/21 < 0.7 08/25/21 - 09/29/21 < 0.9 09/29/21 - 10/27/21 < 0.8 10/27/21 - 11/24/21 < 0.8 11/24/21 - 12/29/21 < 0.6 MEAN C-4

Table C-11.4 CONCENTRATIONS OF GAMMA EMITTERS IN DRINKING WATER SAMPLES COLLECTED IN THE VICINITY OF CLINTON POWER STATION, 2021 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 12/30/20 - 01/27/21 < 8 < 7 < 13 < 7 < 12 < 7 < 9 < 7 < 6 < 21 < 6 < 41 01/27/21 - 02/24/21 < 5 < 6 < 16 < 8 < 14 < 7 < 11 < 6 < 7 < 32 < 10 < 44 02/24/21 - 03/31/21 < 7 < 7 < 13 < 7 < 12 < 7 < 12 < 6 < 7 < 31 < 12 < 46 03/31/21 - 04/28/21 < 5 < 5 < 12 < 7 < 13 < 3 < 8 <4 < 5 < 18 < 6 < 34 04/28/21 - 05/26/21 < 7 < 7 < 12 < 6 < 12 < 8 < 13 < 7 < 8 < 29 < 8 < 53 05/26/21 - 06/30/21 < 6 < 6 < 14 < 6 < 10 < 5 < 10 < 6 < 7 < 20 < 8 < 42 06/30/21 - 07/28/21 < 6 < 6 < 12 < 6 < 12 < 6 < 11 < 7 < 7 < 24 < 10 < 38 07/28/21 - 08/25/21 <4 < 7 < 13 < 7 < 14 < 6 < 9 < 7 < 7 < 25 < 9 < 55 08/25/21 - 09/29/21 < 7 < 4 < 15 < 7 < 12 < 6 < 11 < 7 < 7 < 27 < 9 < 47 09/29/21 - 10/27/21 < 7 < 7 < 10 < 5 < 11 < 6 < 10 < 7 < 7 < 26 < 7 < 45 10/27/21 - 11/24/21 < 5 <4 < 11 < 6 < 12 < 5 < 8 < 7 < 6 < 26 < 11 < 35 11/24/21 - 12/29/21 < 3 < 5 < 9 < 5 < 7 < 6 < 9 < 5 < 5 < 26 < 7 < 33 0I MEAN 0,

Table C-111.1 CONCENTRATIONS OF TRITIUM IN WELL WATER SAMPLES COLLECTED IN THE VICINITY OF CLINTON POWER STATION, 2021 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION PERIOD CL-07D CL-12R CL-12T 03/31/21 - 03/31/21 < 167 < 167 < 168 06/30/21 - 06/30/21 < 192 < 188 < 192 09/29/21 - 09/29/21 < 186 < 186 < 187 12/29/21 - 12/29/21 < 178 < 173 < 184 MEAN C-6

Table C-111.2 CONCENTRATIONS OF GAMMA EMITTERS IN WELL WATER SAMPLES COLLECTED IN THE VICINITY OF CLINTON POWER STATION, 2021 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 03/31/21 < 6 < 8 < 15 < 8 < 13 < 7 < 11 < 8 < 6 < 28 < 10 < 48 06/30/21 < 7 < 6 < 14 < 8 < 19 < 8 < 12 < 9 < 9 < 33 < 9 < 57 09/29/21 < 6 < 5 < 15 < 9 < 14 < 6 < 12 < 8 < 5 < 29 < 9 < 35 12/29/21 < 5 < 7 < 13 < 7 < 11 < 7 < 11 < 7 < 7 < 30 < 8 < 44 MEAN CL-12R 03/31/21 < 5 < 7 < 10 < 6 < 12 < 7 < 10 < 5 < 6 < 31 < 11 < 52 06/30/21 < 8 < 8 < 14 < 10 < 15 < 8 < 15 < 10 < 8 < 34 < 13 < 55 09/29/21 < 8 < 6 < 15 < 8 < 16 < 8 < 15 < 7 < 7 < 33 < 10 < 49 12/29/21 < 6 < 6 < 11 < 6 < 12 < 7 < 11 < 6 < 7 < 23 < 9 < 47 MEAN C)

I

--.J CL-12T 03/31/21 < 6 < 6 < 11 < 7 < 15 < 7 < 11 < 7 < 8 < 26 < 8 < 44 06/30/21 <4 <4 < 10 < 6 < 12 <4 < 9 < 5 < 7 < 25 < 11 < 31 09/29/21 < 8 < 6 < 15 < 8 < 15 < 8 < 13 < 8 < 7 < 35 < 12 < 41 12/29/21 < 6 < 5 < 15 < 7 < 14 < 7 < 10 < 5 < 5 < 26 < 8 < 37 MEAN

Table C-IV.1 CONCENTRATIONS OF GAMMA EMITTERS IN FISH SAMPLES COLLECTEC IN THE VICINITY OF CLINTON POWER STATION, 2021 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 Cs-134 Cs-137 Ba-140 La-140 Ce-144 CL-19 Largemouth Bass 04/30/21 < 68 < 46 < 141 < 59 < 96 < 59 < 110 < 42 < 57 < 197 < 78 < 239 Channel Catfish 04/30/21 < 77 < 70 < 124 < 25 < 134 < 81 < 118 < 89 < 72 < 291 < 101 < 391 Bluegill 04/30/21 < 66 < 64 < 131 < 59 < 83 < 55 < 102 < 62 < 51 < 191 < 71 < 277 Carp 04/30/21 < 52 < 38 < 109 < 53 < 154 < 54 < 85 < 33 < 57 < 271 < 48 < 212 Largemouth Bass 10/12/21 < 81 < 83 < 145 < 59 < 112 < 80 < 132 < 90 < 69 < 344 < 92 < 403 Channel Catfish 10/12/21 < 70 < 60 < 139 < 66 < 179 < 79 < 125 < 78 < 70 < 335 < 94 < 387 Bluegill 10/12/21 < 59 < 55 < 119 < 52 < 90 < 50 < 94 < 63 < 61 < 268 < 82 < 276 Carp 10/12/21 < 54 < 63 < 145 < 59 < 79 < 74 < 122 < 58 < 60 < 285 < 44 < 310 MEAN CL-105 Largemouth Bass 04/30/21 < 67 < 69 < 139 < 84 < 122 < 74 < 134 < 75 < 71 < 291 < 49 < 357 White Crappie 04/30/21 < 50 < 44 < 92 < 56 < 92 < 53 < 105 < 65 < 57 < 225 < 66 < 238

(")

I Bluegill 04/30/21 < 50 < 43 < 112 < 52 < 113 < 46 < 76 < 52 < 47 < 202 < 77 < 215 OJ Carp 04/30/21 < 72 < 81 < 151 < 62 < 184 < 79 < 135 < 99 < 72 < 354 < 110 < 372 Largemouth Bass 10/12/21 < 50 < 58 < 120 < 73 < 106 < 65 < 98 < 58 < 69 < 292 < 136 < 271 White Crappie/White Bass 10/12/21 < 83 < 76 < 161 < 87 < 130 < 78 < 122 < 87 < 92 < 243 < 114 < 341 Bluegill 10/12/21 < 50 < 54 < 102 < 58 < 152 < 51 < 71 < 57 < 46 < 264 < 88 < 259 Carp 10/12/21 < 64 < 80 < 156 < 69 < 133 < 67 < 136 < 90 < 85 < 319 < 88 < 428 MEAN

Table C-V.1 CONCENTRATIONS OF GAMMA EMITTERS IN SEDIMENT SAMPLES COLLECTED IN THE VICINITY OF CLINTON POWER STATION, 2021 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 Cs-134 Cs-137 Ba-140 La-140 Ce-144 CL-07B 04/30/21 < 37 < 40 < 84 < 34 < 98 < 46 < 73 < 51 < 37 < 191 < 58 < 253 10/12/21 < 59 < 59 < 122 < 65 < 128 < 61 < 114 < 62 < 47 < 261 < 63 < 317 MEAN CL-105 04/30/21 < 53 < 52 < 123 < 48 < 112 < 50 < 89 < 42 < 61 < 223 < 75 < 323 10/12/21 < 55 < 62 < 168 < 81 < 162 < 62 < 120 < 74 < 64 < 265 < 97 < 277 MEAN

()

I tO

Table C-Vl.1 CONCENTRATIONS OF GROSS BETA IN AIR PARTICULATE SAMPLES COLLECTED IN THE VICINITY OF CLINTON POWER STATION, 2021 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 12130120 - 01106121 24 +/-5 18 +/- 4 23 +/- 5 21 +/- 5 24 +/- 5 28 +/- 8 01106121 - 01113121 16 +/- 4 19 +/-4 16 +/- 4 17 +/- 4 17 +/- 4 16 +/- 4 01113121 - 01120121 17 +/- 4 18 +/- 5 20 +/- 5 16 +/- 4 22 +/- 5 20 +/- 5 01120121 - 01127121 14 +/- 4 12 +/- 4 14 +/- 4 16 +/- 4 15 +/- 4 14 +/- 4 01127121 - 02103121 20 +/- 4 16 +/- 4 20 +/- 5 17 +/- 4 22 +/- 5 23 +/- 5 02103121 - 02110121 35 +/- 5 36 +/- 5 32 +/- 6 26 +/- 5 33 +/- 6 33 +/- 5 02110121 - 02117121 18 +/- 4 21 +/- 5 19 +/- 5 20 +/- 5 26 +/- 6 21 +/- 4 02117121 - 02124121 23 +/- 5 21 +/- 5 20 +/- 4 21 +/- 5 27 +/- 5 24 +/- 5 02124121 - 03103121 14 +/- 4 14 +/- 4 16 +/- 4 17 +/- 4 14 +/- 4 19 +/- 5 03103121 - 03110121 17 +/- 4 18 +/- 4 21 +/- 4 17 +/- 4 15 +/- 4 17 +/- 4 03110121 - 03117121 13 +/- 4 14 +/- 4 15 +/- 4 15 +/- 4 15 +/- 4 12 +/- 4 03117121 - 03124121 13 +/- 4 14 +/- 4 11 +/- 4 13 +/- 4 19 +/- 5 18 +/- 4 03124121 - 03131121 12 +/- 4 10 +/- 4 14 +/- 4 15 +/- 4 15 +/- 4 12 +/- 4 03131121 - 04107121 20 +/- 5 20 +/- 5 20 +/- 5 17 +/- 4 18 +/- 4 23 +/- 5 04107121 - 04114121 13 +/- 4 13 +/- 4 11 +/- 3 13 +/- 4 16 +/- 4 13 +/- 4 04114121 - 04121121 13 +/- 4 11 +/- 4 12 +/- 4 9+/-4 14 +/- 4 14 +/- 4 04121121 - 04128121 21 +/- 5 23 +/- 5 21 +/- 5 17 +/- 4 18 +/- 4 20 +/- 5 04128121 - 05105121 17 +/- 4 17 +/- 4 5 +/- 3 16 +/- 4 14 +/- 4 18 +/- 4 05105121 - 05112121 8 +/- 3 12 +/- 4 8 +/- 3 8 +/- 4 6 +/- 3 7 +/- 3 05112121 - 05119121 22 +/- 5 20 +/- 5 22 +/- 5 17 +/- 4 15 +/- 4 16 +/- 4 05119121 - 05126121 21 +/- 5 20 +/- 5 17 +/- 4 19 +/- 5 20 +/- 5 20 +/- 4 05126121 - 06102121 16 +/- 4 17 +/- 4 19 +/- 4 14 +/- 4 14 +/- 4 23 +/- 5 06102121 - 06109121 15 +/- 4 13 +/- 4 17 +/- 4 15 +/- 4 15 +/- 4 16 +/- 4 06109121 - 06116121 14 +/- 4 17 +/-4 13 +/- 4 15 +/- 4 14 +/- 4 16 +/- 4 06116121 - 06123121 20 +/- 4 21 +/-4 20 +/- 4 19 +/- 4 21 +/- 4 25 +/- 5 06123121 - 06130121 11 +/- 4 14 +/- 4 8 +/- 4 12 +/- 4 13 +/- 4 11 +/- 4 06130121 - 07107121 13 +/- 4 15 +/- 4 17 +/- 4 11 +/- 4 15 +/- 4 14 +/- 4 07107121 - 07114121 16 +/- 4 15 +/- 4 15 +/- 4 16 +/- 4 13 +/- 4 17 +/- 4 07114121 - 07121121 19 +/- 4 17 +/- 4 16 +/- 4 15 +/- 4 16 +/- 4 17 +/- 4 07121121 - 07128121 28 +/- 5 28 +/- 5 5 +/- 3 25 +/- 5 29 +/-5 30 +/-5 07128121 - 08104121 25 +/- 11 (1) 22 +/- 5 15 +/- 4 22 +/- 5 23 +/- 5 08104121 - 08111121 21 +/- 5 25 +/- 6 20 +/- 5 16 +/- 4 19 +/- 5 22 +/- 5 08111121 - 08118121 16 +/- 4 23 +/- 4 22 +/- 4 19 +/- 4 17 +/-4 21 +/-4 08118121 - 08125121 28 +/- 5 27 +/- 5 30 +/- 5 25 +/- 5 30 +/- 5 27 +/-5 08125121 - 09101121 15 +/-4 16 +/- 4 15 +/- 4 13 +/- 4 18 +/- 4 16 +/- 4 09101121 - 09108121 25 +/- 5 26 +/- 5 6 +/- 3 19 +/- 4 25 +/- 5 25 +/- 5 09108121 - 09115121 18 +/- 5 18 +/- 5 21 +/- 5 18 +/- 5 17 +/- 5 20 +/- 5 09115121 - 09122121 19 +/- 5 20 +/- 5 21 +/- 5 22 +/- 5 25 +/- 5 23 +/-5 09122121 - 09129121 23 +/- 5 25 +/- 5 24 +/- 5 21 +/- 5 27 +/-5 32 +/-5 09129121 - 10106121 26 +/- 5 32 +/- 5 32 +/- 5 24 +/- 5 30 +/- 5 31 +/- 5 10106121 - 10113121 30 +/-5 33 +/- 5 26 +/- 5 24 +/- 5 29 +/- 5 29 +/- 5 10113121 - 10120121 21 +/-5 25 +/- 5 24 +/- 5 23 +/- 5 24 +/- 5 26 +/- 5 10120121 - 10127121 14 +/- 4 15 +/- 4 18 +/- 4 15 +/- 4 15 +/- 4 15 +/- 4 10127121 - 11103121 14 +/-4 16 +/- 4 15 +/- 4 18 +/- 4 16 +/- 4 16 +/-4 11103121 - 11110121 30 +/- 5 33 +/- 5 34 +/- 5 34 +/- 5 35 +/- 5 40 +/- 6 11110121 - 11117121 17 +/- 5 16 +/- 5 15 +/- 5 14 +/- 4 15 +/- 4 16 +/- 5 11117121 - 11124121 15 +/- 4 16 +/- 4 19 +/- 4 17 +/- 4 16 +/- 4 13 +/- 4 11124121 - 12101121 25 +/- 5 29 +/- 5 32 +/- 5 25 +/- 5 27 +/- 5 28 +/- 5 12101121 - 12108121 21 +/-4 18 +/- 4 22 +/- 4 22 +/- 4 19 +/- 4 20 +/-4 12108121 - 12115121 18 +/- 5 22 +/- 5 21 +/- 5 19 +/- 5 23 +/- 5 22 +/- 5 12115121 - 12122121 20 +/-4 23 +/- 5 23 +/- 5 23 +/- 5 28 +/- 5 24 +/- 5 12122121 - 12129121 34 +/- 5 37 +/- 6 41 +/- 6 38 +/- 6 39 +/- 6 38 +/- 6 MEAN+/- 2 STD DEV 19 +/- 12 20 +/- 13 19 +/- 15 18 +/- 11 20 +/- 13 21 +/- 14 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, 2021 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 12/30/20 - 01/06/21 24 +/- 5 19 +/- 5 25 +/- 5 22 +/- 5 01/06/21 - 01/13/21 17 +/- 4 16 +/- 4 17 +/- 4 16 +/- 4 01/13/21 - 01/20/21 19 +/- 5 18 +/- 5 18 +/- 5 15 +/- 4 01/20/21 - 01/27/21 18 +/- 4 9 +/- 4 16 +/- 4 13 +/- 4 01/27/21 - 02/03/21 19 +/- 4 20 +/- 5 17 +/- 4 19 +/- 4 02/03/21 - 02/10/21 35 +/- 5 34 +/- 5 32 +/- 5 32 +/- 5 02/10/21 - 02/17/21 22 +/- 5 21 +/- 5 14 +/- 4 20 +/- 5 02/17/21 - 02/24/21 23 +/- 5 23 +/- 5 24 +/- 5 25 +/- 5 02/24/21 - 03/03/21 18 +/- 4 14 +/- 4 13 +/- 4 16 +/- 4 03/03/21 - 03/10/21 19 +/- 4 16 +/- 4 18 +/- 4 16 +/- 4 03/10/21 - 03/17/21 14 +/- 4 11 +/- 4 12 +/- 4 14 +/- 4 03/17/21 - 03/24/21 15 +/- 4 13 +/- 4 13 +/- 4 15 +/- 4 03/24/21 - 03/31/21 11 +/- 4 12 +/- 4 10 +/- 4 15 +/- 4 03/31/21 - 04/07/21 19 +/- 5 16 +/- 4 16 +/- 4 23 +/- 5 04/07/21 - 04/14/21 13 +/- 4 11 +/- 3 14 +/- 4 14 +/- 4 04/14/21 - 04/21/21 9+/-4 8 +/- 4 8+/-4 8 +/- 4 04/21/21 - 04/28/21 19 +/- 4 17 +/- 4 18 +/- 4 19 +/- 4 04/28/21 - 05/05/21 19 +/- 4 11 +/- 4 13 +/- 4 10 +/- 4 05/05/21 - 05/12/21 8 +/-4 8 +/- 4 9 +/- 4 10 +/- 4 05/12/21 - 05/19/21 18 +/- 4 16 +/- 4 17 +/- 4 22 +/- 5 05/19/21 - 05/26/21 18 +/- 4 16 +/- 4 19 +/- 4 17 +/- 4 05/26/21 - 06/02/21 15 +/- 4 16 +/- 4 16 +/- 4 16 +/- 4 06/02/21 - 06/09/21 16 +/- 4 15 +/- 4 13 +/- 4 18 +/- 4 06/09/21 - 06/16/21 16 +/- 4 19 +/- 4 17 +/- 4 18 +/- 4 06116/21 - 06/23/21 20 +/- 4 17 +/- 4 19 +/- 4 19 +/- 4 06/23/21 - 06/30/21 10 +/- 4 8 +/- 4 12 +/- 4 10 +/- 4 06/30/21 - 07/07/21 13 +/- 4 12 +/- 4 17 +/- 4 19 +/- 5 07/07/21 - 07/14/21 17 +/- 4 13 +/- 4 15 +/- 4 14 +/- 4 07/14/21 - 07/21/21 18 +/- 4 17 +/- 4 16 +/- 4 16 +/- 4 07/21/21 - 07/28/21 27 +/- 5 26 +/- 5 29 +/- 5 28 +/- 5 07/28/21 - 08/04/21 24 +/- 5 21 +/- 5 23 +/- 5 22 +/- 5 08/04/21 - 08/11/21 25 +/- 5 22 +/- 5 24 +/- 5 22 +/- 5 08/11/21 - 08/18/21 20 +/- 4 16 +/- 4 21 +/- 4 20 +/- 4 08/18/21 - 08/25/21 30 +/- 5 21 +/- 4 29 +/- 5 28 +/- 5 08/25/21 - 09/01/21 13 +/- 4 15 +/- 4 10 +/- 3 15 +/- 4 09/01/21 - 09/08/21 30 +/- 5 27 +/- 5 24 +/- 5 27 +/- 5 09/08/21 - 09/15/21 18 +/- 5 19 +/- 5 25 +/- 5 19 +/- 5 09/15/21 - 09/22/21 22 +/- 5 19 +/- 5 23 +/- 5 24 +/- 5 09/22/21 - 09/29/21 26 +/- 5 28 +/- 5 24 +/- 5 28 +/- 5 09/29/21 - 10/06/21 31 +/- 5 24 +/-5 25 +/- 5 31 +/- 5 10/06/21 - 10/13/21 28 +/- 5 29 +/- 5 26 +/- 5 27 +/- 5 10/13/21 - 10/20/21 24 +/- 5 26 +/-5 21 +/- 5 26 +/- 5 10/20/21 - 10/27/21 14 +/- 4 11 +/-4 16 +/- 4 18 +/- 4 10/27/21 - 11/03/21 18 +/- 4 17 +/-4 14 +/- 4 20 +/- 5 11/03/21 - 11/10/21 33 +/- 5 32 +/- 5 31 +/- 5 29 +/- 5 11/10/21 - 11/17/21 15 +/- 4 14 +/-4 10 +/- 4 17 +/- 5 11/17/21 - 11/24/21 11 +/- 4 15 +/-4 14 +/- 4 17 +/- 4 11/24/21 - 12/01/21 25 +/- 5 29 +/- 5 28 +/- 5 31 +/- 5 12/01/21 - 12/08/21 19 +/- 4 20 +/-4 22 +/- 5 20 +/- 4 12/08/21 - 12/15/21 21 +/- 5 24 +/- 5 19 +/- 5 21 +/- 5 12/15/21 - 12/22/21 24 +/- 5 21 +/- 4 22 +/- 4 24 +/- 5 12/22121 - 12/29/21 29 +/- 5 23 +/-5 35 +/- 6 34 +/- 5 MEAN+/- 2 STD DEV 20 +/- 12 18 +/- 12 19 +/- 13 20 +/- 12 THE MEAN AND 7WO STANDARD DEVIATION ARE CALCULATED USING THE POSITIVE VALUES 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, 2021 RESULTS IN UNITS OF E-3 PCI/CU METER+/- 2 SIGMA GROUP 1- 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 12/30/20 - 02/03/21 12 28 18 +/- 7 12/30/20 - 02/03/21 9 25 18 +/- 7 12/30/20 - 02/03/21 13 22 17 +/- 7 02/03/21 - 03/03/21 14 36 23 +/- 14 02/03/21 - 03/03/21 13 35 23 +/- 15 02/03/21 - 03/03/21 16 32 23 +/- 14 03/03/21 - 03/31/21 10 21 15 +/- 5 03/03/21 - 03/31/21 10 19 14 +/- 5 03/03/21 - 03/31/21 14 16 15 +/- 2 03/31/21 - 04/28/21 9 23 16 +/- 8 03/31/21 - 04/28/21 8 19 14 +/- 8 03/31/21 - 04/28/21 8 23 16 +/- 13 04/28/21 - 06/02/21 5 23 16 +/- 10 04/28/21 - 06/02/21 8 19 15 +/- 8 04/28/21 - 06/02/21 10 22 15 +/- 10 06/02/21 - 06/30/21 8 25 16 +/- 8 06/02/21 - 06/30/21 8 20 15 +/- 8 06/02/21 - 06/30/21 10 19 16 +/- 9 06/30/21 - 08/04/21 5 30 18 +/- 12 06/30/21 - 08/04/21 12 29 19 +/- 11 06/30/21 - 08/04/21 14 28 20 +/- 11 08/04/21 - 09/01/21 13 30 21 +/- 10 08/04/21 - 09/01/21 10 30 20 +/- 12 08/04/21 - 09/01/21 15 28 21 +/- 11 09/01/21 - 09/29/21 6 32 22 +/- 10 09/01/21 - 09/29/21 18 30 24 +/- 8 09/01/21 - 09/29/21 19 28 24 +/- 8 09/29/21 - 11/03/21 14 33 23 +/- 13 09/29/21 - 11/03/21 11 31 22 +/- 12 09/29/21 - 11/03/21 18 31 24 +/- 10 11/03/21 - 12/01/21 13 40 23 +/- 17 11/03/21 - 12/01/21 10 33 21 +/- 18 11/03/21 - 12/01/21 17 31 24 +/- 15 C)

I 12/01/21 - 12/29/21 18 41 26 +/- 15 12/01/21 - 12/29/21 19 35 23 +/- 9 12/01/21 - 12/29/21 20 34 25 +/- 13 I\.)

12/30/20 - 12/29/21 5 41 20 +/- 13 12/30/20 - 12/29/21 8 35 19 +/- 12 12/30/20 - 12/29/21 8 34 20 +/- 12

Table C-Vl.3 CONCENTRATIONS OF GAMMA EMITTERS IN AIR PARTICULATE SAMPLES COLLECTED IN THE VICINITY OF CLINTON POWER STATION, 2021 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-1 12/30/20 - 03/31/21 < 1 < 2 < 4 < 2 < 18 < 2 < 2 < 2 < 8 03/31/21 - 06/30/21 < 3 < 2 < 3 < 2 < 15 < 2 < 2 < 2 < 6 06/30/21 - 09/29/21 < 3 < 3 < 5 < 3 < 24 < 2 < 3 < 3 < 11 09/29/21 - 12/29/21 <4 < 3 < 6 <4 < 32 < 4 <4 <4 < 12 MEAN CL-2 12/30/20 - 03/31/21 < 2 < 2 < 4 < 3 < 23 < 3 < 2 < 3 < 10 03/31/21 - 06/30/21 < 2 < 2 <4 < 1 < 11 < 1 < 1 < 2 < 6 06/30/21 - 09/29/21 < 2 < 2 < 3 < 2 < 14 < 2 < 2 < 2 < 7 09/29/21 - 12/29/21 < 2 < 2 < 3 < 2 < 15 < 3 < 2 < 2 < 9 MEAN 0I CL-3 12/30/20 - 03/31/21 < 2 < 2 < 3 < 2 < 15 < 2 < 2 < 2 < 7

-lo.

c,) 03/31/21 - 06/30/21 < 2 < 1 < 2 < 1 < 13 < 1 < 1 < 2 < 6 06/30/21 - 09/29/21 < 3 < 3 < 5 < 3 < 23 < 3 < 3 < 3 < 11 09/29/21 - 12/29/21 < 2 < 3 < 5 <4 < 31 < 3 < 3 < 4 < 13 MEAN CL-4 12/30/20 - 03/31/21 < 3 < 3 < 5 < 2 < 22 < 3 < 3 < 3 < 11 03/31/21 - 06/30/21 < 2 < 2 < 4 < 2 < 18 < 2 < 2 < 2 < 6 06/30/21 - 09/29/21 < 2 < 2 < 3 < 2 < 17 < 2 < 2 < 2 < 7 09/29/21 - 12/29/21 < 1 < 3 < 3 < 2 < 16 < 2 < 2 < 3 < 9 MEAN CL-6 12/30/20 - 03/31/21 < 2 < 2 < 3 < 2 < 20 < 2 < 1 < 2 < 8 03/31/21 - 06/30/21 < 3 < 3 < 6 <4 < 28 < 3 < 3 <4 < 15 06/30/21 - 09/29/21 < 3 < 4 < 5 <4 < 25 < 4 < 3 < 3 < 12 09/29/21 - 12/29/21 < 2 < 2 <4 < 2 < 15 < 2 < 2 < 3 < 8 MEAN

Table C-Vl.3 CONCENTRATIONS OF GAMMA EMITTERS IN AIR PARTICULATE SAMPLES COLLECTED IN THE VICINITY OF CLINTON POWER STATION, 2021 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 12/30/20 - 03/31/21 < 2 < 3 < 5 < 2 < 22 < 2 < 3 < 3 < 10 03/31/21 - 06/30/21 < 2 < 2 <4 < 2 < 20 < 2 < 2 < 2 < 6 06/30/21 - 09/29/21 < 2 < 2 < 3 < 2 < 18 < 2 < 2 < 2 < 9 09/29/21 - 12/29/21 < 3 < 2 < 3 < 2 < 20 < 2 < 2 < 3 < 8 MEAN CL-8 12/30/20 - 03/31/21 < 3 < 2 < 3 < 2 < 14 < 2 < 2 < 2 < 7 03/31/21 - 06/30/21 < 2 < 1 < 3 < 2 < 13 < 2 < 2 < 2 < 6 06/30/21 - 09/29/21 < 1 < 2 < 3 < 2 < 16 < 2 < 2 < 3 < 9 09/29/21 - 12/29/21 < 3 < 2 < 3 <2 < 12 < 2 < 2 < 2 < 6 MEAN C')

I CL-11 12/30/20 - 03/31/21 <4 < 3 < 5 < 4 < 28 < 3 < 3 < 4 < 12

.i:,. 03/31/21 - 06/30/21 < 2 < 2 < 3 < 1 .< 14 < 2 < 1 < 2 < 7 06/30/21 - 09/29/21 <4 < 3 <4 < 3 < 20 < 3 < 2 < 3 < 10 09/29/21 - 12/29/21 < 2 < 2 <4 < 1 < 18 < 2 < 2 < 2 < 6 MEAN CL-15 12/30/20 - 03/31/21 < 3 < 2 < 2 < 2 < 11 < 2 < 1 < 2 <7 03/31/21 - 06/30/21 < 2 < 1 < 2 < 1 < 14 < 1 < 1 < 2 < 6 06/30/21 - 09/29/21 < 3 < 3 < 5 < 3 < 23 < 3 < 3 < 4 < 13 09/29/21 - 12/29/21 < 4 < 3 < 6 < 3 < 24 < 3 < 3 <4 < 12 MEAN CL-94 12/30/20 - 03/31/21 < 1 < 2 <4 < 2 < 20 < 2 < 2 < 2 < 7 03/31/21 - 06/30/21 <4 < 3 < 5 < 3 < 22 < 3 < 3 < 3 < 12 06/30/21 - 09/29/21 < 2 < 2 < 3 < 2 < 12 < 1 < 2 < 2 < 6 09/29/21 - 12/29/21 < 3 < 2 < 3 < 2 < 18 < 2 < 2 < 3 < 8 MEAN

Table C-Vll.1 CONCENTRATIONS OF I-131 IN AIR IODINE SAMPLES COLLECTED IN THE VICINITY OF CLINTON POWER STATION, 2021 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 12/30/20 - 01/06/21 < 33 < 34 < 16 < 35 < 37 < 32 01/06/21 - 01/13/21 < 30 < 30 < 15 < 31 < 36 < 24 01/13/21 - 01/20/21 < 51 < 52 < 22 < 51 < 35 < 35 01/20/21 - 01/27/21 < 41 < 41 < 17 < 42 < 37 < 15 01/27/21 - 02/03/21 < 25 < 25 < 25 < 25 < 34 < 35 02/03/21 - 02/10/21 < 37 < 37 < 35 < 39 < 66 < 25 02/10/21 - 02/17/21 < 55 < 55 < 24 < 56 < 24 < 45 02/17/21 - 02/24/21 < 20 < 46 < 45 < 46 < 21 < 49 02/24/21 - 03/03/21 < 38 < 18 < 39 < 39 < 51 < 51 03/03/21 - 03/10/21 < 51 < 52 < 52 < 52 < 19 < 19 03/10/21 - 03/17/21 < 46 < 46 < 20 < 47 < 41 < 42 03/17/21 - 03/24/21 < 56 < 58 < 57 < 25 < 36 < 35 03/24/21 - 03/31/21 < 44 < 44 < 44 < 36 < 57 < 57 03/31/21 - 04/07/21 < 33 < 33 < 28 < 33 < 47 < 22 04/07/21 - 04/14/21 < 21 < 50 < 50 < 50 < 15 < 31 04/14/21 - 04/21/21 < 26 < 26 < 26 < 11 < 9 < 20 04/21/21 - 04/28/21 < 30 < 26 < 31 < 30 < 18 < 41 04/28/21 - 05/05/21 < 28 < 34 < 33 < 33 < 46 < 45 05/05/21 - 05/12/21 < 31 < 31 < 31 < 32 < 43 < 43 05/12/21 - 05/19/21 < 49 < 48 < 20 < 49 < 33 < 27 05/19/21 - 05/26/21 < 28 < 24 < 28 < 28 < 22 < 22 05/26/21 - 06/02/21 < 21 < 49 < 49 < 49 < 31 < 31 06/02/21 - 06/09/21 < 23 < 23 < 23 < 23 < 25 < 24 06/09/21 - 06/16/21 < 19 < 46 < 46 < 46 < 35 < 35 06/16/21 - 06/23/21 < 34 < 34 < 34 < 34 < 37 < 36 06/23/21 - 06/30/21 < 52 < 53 < 52 < 52 < 49 < 48 06/30/21 - 07/07/21 < 22 < 22 < 11 < 22 < 25 < 25 07/07/21 - 07/14/21 < 18 < 44 < 44 < 44 < 44 < 43 07/14/21 - 07/21/21 < 32 < 32 < 32 < 32 < 33 < 32 07/21/21 - 07/28/21 < 50 < 21 < 50 < 50 < 43 < 18 07/28/21 - 08/04/21 < 40 (1) < 33 < 33 < 41 < 41 08/04/21 - 08/11/21 < 42 < 25 < 42 < 43 < 47 < 47 08/11/21 - 08/18/21 < 40 < 40 < 40 < 17 < 51 < 51 08/18/21 - 08/25/21 < 16 < 15 < 16 < 15 < 21 < 17 08/25/21 - 09/01/21 < 20 < 46 < 47 < 47 < 45 < 19 09/01/21 - 09/08/21 < 43 < 18 < 44 < 44 < 42 < 42 09/08/21 - 09/15/21 < 41 < 41 < 21 < 41 < 31 < 37 09/15/21 - 09/22/21 < 28 < 28 < 28 < 28 < 25 < 25 09/22/21 - 09/29/21 < 59 < 59 < 59 < 59 < 53 < 52 09/29/21 - 10/06/21 < 48 < 48 < 48 < 20 < 50 < 50 10/06/21 - 10/13/21 < 23 < 11 < 23 < 23 < 19 < 19 10/13/21 - 10/20/21 < 48 < 49 < 49 < 20 < 43 < 43 10/20/21 - 10/27/21 < 48 < 48 < 48 < 19 < 54 < 53 10/27/21 - 11/03/21 < 20 < 24 < 23 < 23 < 32 < 14 11/03/21 - 11/10/21 < 40 < 41 < 41 < 39 < 44 < 44 11/10/21 - 11/17/21 < 17 < 40 < 40 < 39 < 25 < 24 11/17/21 - 11/24/21 < 63 < 64 < 63 < 26 < 34 < 34 11/24/21 - 12/01/21 < 22 < 53 < 53 < 53 < 36 < 37 12/01/21 - 12/08/21 < 37 < 16 < 38 < 38 < 24 < 21 12/08/21 - 12/15/21 < 37 < 37 < 37 < 25 < 56 < 57 12/15/21 - 12/22/21 < 23 < 55 < 55 < 54 < 37 < 24 12/22/21 - 12/29/21 < 45 < 46 < 46 < 20 < 45 < 46 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, 2021 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 12/30/20 - 01/06/21 < 35 < 38 < 38 < 38 01/06/21 - 01/13/21 < 30 < 36 < 35 < 36 01/13/21 - 01/20/21 < 52 < 35 < 31 < 35 01/20/21 - 01/27/21 < 41 < 38 < 38 < 36 01/27/21 - 02/03/21 < 21 . < 35 < 34 < 15 02/03/21 - 02/10/21 < 38 < 61 < 60 < 61 02/10/21 - 02/17/21 < 56 < 47 < 46 < 47 02/17/21 - 02/24/21 < 46 < 49 < 50 < 49 02/24/21 - 03/03/21 < 39 < 52 < 53 < 22 03/03/21 - 03/10/21 < 22 < 20 < 20 < 20 03/10/21 - 03/17/21 < 46 < 41 < 18 < 41 03/17/21 - 03/24/21 < 57 < 37 < 18 < 36 03/24/21 - 03/31/21 < 44 < 48 < 57 < 56 03/31/21 - 04/07/21 < 33 < 47 < 46 < 47 04/07/21 - 04/14/21 < 50 < 32 < 31 < 31 04/14/21 - 04/21/21 < 27 < 20 < 20 < 20 04/21/21 - 04/28/21 < 30 < 41 < 41 < 41 04/28/21 - 05/05/21 < 33 < 47 < 46 < 20 05/05/21 - 05/12/21 < 13 < 44 < 18 < 44 05/12/21 - 05/19/21 < 48 < 33 < 33 < 33 05/19/21 - 05/26/21 < 28 < 11 < 22 < 22 05/26/21 - 06/02/21 < 49 < 16 < 32 < 31 06/02/21 - 06/09/21 < 11 < 25 < 13 < 25 06/09/21 - 06/16/21 < 46 < 30 < 34 < 35 06/16/21 - 06/23/21 < 29 < 37 < 18 < 37 06/23/21 - 06/30/21 < 23 < 49 < 21 < 49 06/30/21 - 07/07/21 < 22 < 25 < 25 < 17 07/07/21 - 07/14/21 < 44 < 43 < 19 < 43 07/14/21 - 07/21/21 < 13 < 33 < 16 < 33 07/21/21 - 07/28/21 < 51 < 43 < 43 < 42 07/28/21 - 08/04/21 < 33 < 17 < 40 < 41 08/04/21 - 08/11/21 < 42 < 47 < 20 < 47 08/11/21 - 08/18/21 < 40 < 22 < 50 < 51 08/18/21 - 08/25/21 < 7 < 21 < 21 < 21 08/25/21 - 09/01/21 < 47 < 44 < 45 < 44 09/01/21 - 09/08/21 < 44 < 43 < 18 < 43 09/08/21 - 09/15/21 < 42 < 37 < 37 < 36 09/15/21 - 09/22/21 < 12 < 25 < 25 < 12 09/22/21 - 09/29/21 < 25 < 52 < 53 < 22 09/29/21 - 10/06/21 < 49 < 50 < 34 < 50 10/06/21 - 10/13/21 < 23 < 19 < 16 < 19 10/13/21 - 10/20/21 < 49 < 43 < 18 < 43 10/20/21 - 10/27/21 < 49 < 52 < 23 < 52 10/27/21 - 11/03/21 < 24 < 33 < 33 < 33 11/03/21 - 11/10/21 < 17 < 43 < 19 < 44 11/10/21 - 11/17/21 < 39 < 24 < 21 < 24 11/17/21 - 11/24/21 < 64 < 34 < 23 < 34 11/24/21 - 12/01/21 < 53 < 36 < 16 < 37 12/01/21 - 12/08/21 < 38 < 25 < 25 < 24 12/08/21 - 12/15/21 < 37 < 23 < 57 < 56 12/15/21 - 12/22/21 < 54 < 36 < 36 < 36 12/22/21 - 12/29/21 < 47 < 45 < 20 < 46 MEAN C-16

Table C-Vlll.1 CONCENTRATIONS OF I-131 IN MILK SAMPLES COLLECTED IN THE VICINITY OF CLINTON POWER STATION, 2021 RES ULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION CONTROL FARM PERIOD CL-116 01/27/21 < 0.8 02/24/21 < 0.9 03/31/21 < 0.7 04/28/21 < 0.9 05/12/21 < 0.9 05/26/21 < 0.3 06/09/21 < 0.5 06/23/21 < 0.7 07/07/21 < 0.9 07/21/21 < 0.7 08/04/21 < 0.8 08/18/21 < 0.7 09/01/21 < 0.9 09/15/21 < 0.9 09/29/21 < 0.9 10/13/21 < 1.0 10/27/21 < 0.9 11/24/21 < 0.9 12/29/21 < 0.8 MEAN C-17

Table C-Vlll.2 CONCENTRATIONS OF GAMMA EMITTERS IN MILK SAMPLES COLLECTED IN THE VICINITY OF CLINTON POWER STATION, 2021 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 01127121 912 +/- 164 < 7 < 7 < 15 < 10 < 16 < 7 < 14 < 8 < 10 < 27 < 8 < 54 02124121 1122 +/- 179 < 10 < 7 < 18 < 10 < 15 < 8 < 14 < 9 < 10 < 38 < 11 < 60 03131121 1159 +/- 197 < 7 < 9 < 23 < 6 < 18 < 8 < 16 < 9 < 8 < 36 < 12 < 63 04128121 1010 +/- 158 < 9 < 10 < 19 < 10 < 18 < 9 < 15 < 10 < 9 < 32 < 8 < 58 05112121 1204 +/- 186 < 8 < 8 < 16 < 9 < 20 < 7 < 16 < 9 < 8 < 26 < 6 < 63 05126121 1120 +/- 186 < 8 < 8 < 19 < 7 < 19 < 7 < 12 < 10 < 9 < 38 < 9 < 58 06109121 1230 +/- 162 < 7 < 8 < 17 < 9 < 19 < 7 < 14 < 9 < 7 < 26 < 10 < 40 06123121 1116 +/- 175 < 9 < 8 < 17 < 9 < 18 < 8 < 16 < 9 < 7 < 30 < 7 < 56 07107121 1039 +/- 133 < 6 < 7 < 15 < 6 < 16 < 8 < 12 < 7 < 8 < 22 < 7 < 51 07121121 1062 +/- 171 < 7 < 9 < 12 < 10 < 17 < 8 < 12 < 11 < 9 < 33 < 9 < 57 08104121 723 +/- 151 < 8 < 7 < 20 < 8 < 16 < 9 < 12 < 8 < 8 < 30 < 8 < 68

()

08118121 1024 +/- 175 < 9 < 9 < 21 < 9 < 14 < 9 < 15 < 10 < 8 < 39 < 11 < 63 I

-l. 09101121 1011 +/- 121 < 5 < 5 < 13 < 7 < 13 < 6 < 11 < 6 < 6 < 28 < 8 < 41 0:,

09115121 997 +/- 119 < 5 < 5 < 12 < 5 < 11 < 5 < 8 < 6 < 6 < 22 < 8 < 37 09129121 1447 +/- 189 < 7 < 9 < 18 < 7 < 16 < 8 < 11 < 8 < 8 < 43 < 11 < 60 10113121 891 +/- 162 < 8 < 9 < 16 < 9 < 20 < 8 < 16 < 10 < 9 < 36 < 12 < 61 10127121 1182 +/- 176 < 7 < 7 < 14 < 5 < 15 < 8 < 12 < 7 < 9 < 32 < 8 < 61 11124121 1083 +/- 149 < 6 < 7 < 16 < 7 < 15 < 8 < 10 <.7 < 8 < 33 < 11 < 55 12129121 1083 +/- 160 < 7 < 7 < 15 < 8 < 16 < 7 < 10 < 8 < 8 < 29 < 9 < 44 MEAN +/- 2 STD DEV 1074 +/- 301 THE MEAN AND TWO 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, 2021 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 Cabbage 06/30/21 < 30 < 30 < 57 < 33 < 70 < 32 < 47 < 46 < 34 < 31 < 151 < 43 < 159 Lettuce 06/30/21 < 24 < 25 < 66 < 35 < 62 < 34 < 39 < 47 < 32 < 28 < 116 < 42 < 198 Swiss Chard 06/30/21 < 28 < 31 < 69 < 32 < 75 < 36 < 60 < 53 < 41 < 36 < 133 < 59 < 190 Cabbage 07/28/21 < 17 < 23 < 50 < 32 < 61 < 29 < 40 < 28 < 27 < 26 < 92 < 17 < 173 Lettuce 07/28/21 < 26 < 28 < 74 < 24 < 70 < 24 < 58 < 34 < 34 < 25 < 107 < 31 < 139 Swiss Chard 07/28/21 < 32 < 28 < 66 < 32 < 75 < 29 < 60 < 33 < 36 < 28 < 121 < 21 < 193 Cabbage 08/25/21 < 28 < 28 < 49 < 38 < 60 < 30 < 51 < 33 < 32 < 29 < 101 < 23 < 176 Lettuce 08/25/21 < 23 < 29 < 56 < 33 < 71 < 30 < 42 < 32 < 29 < 26 < 82 < 28 < 153 Swiss Chard 08/25/21 < 22 < 21 < 51 < 33 < 57 < 28 < 37 < 27 < 32 < 24 < 102 < 24 < 127 Cabbage 09/29/21 < 21 < 22 < 49 < 25 < 50 < 25 < 34 < 31 < 24 < 23 < 92 < 28 < 119 Cabbage 09/29/21 < 25 < 23 < 49 < 24 < 56 < 27 < 42 < 37 < 31 < 24 < 108 < 19 < 137 Swiss Chard 09/29/21 < 27 < 27 < 76 < 31 < 77 < 28 < 52 < 45 < 29 < 33 < 134 < 38 < 155 MEAN CL-115 Cabbage 06/30/21 < 29 < 22 < 49 < 25 < 40 < 24 < 37 < 46 < 26 < 27 < 121 < 23 < 144 Lettuce 06/30/21 < 28 < 21 < 45 < 35 < 50 < 21 < 36 < 35 < 24 < 28 < 116 < 34 < 132

(') Swiss Chard 06/30/21 < 23 < 26 < 60 < 28 < 71 < 26 < 47 < 40 < 36 < 29 < 116 < 32 < 158 I

->. Cabbage 07/28/21 < 26 < 30 < 76 < 34 < 53 < 28 < 50 < 38 < 31 < 35 < 137 < 37 < 193

(!)

Swiss Chard 07/28/21 < 23 < 31 < 48 < 31 < 81 < 30 < 47 < 28 < 31 < 31 < 105 < 35 < 152 Swiss Chard 07/28/21 < 26 < 26 < 68 < 28 < 73 < 31 < 51 < 36 < 32 < 32 < 114 < 32 < 179 Cabbage 08/25/21 < 27 < 29 < 51 < 29 < 69 < 32 < 49 < 34 < 30 < 27 < 97 < 35 < 170 Swiss Chard 08/25/21 < 23 < 32 < 53 < 35 < 72 < 33 < 45 < 28 < 29 < 27 < 114 < 30 < 169 Soy Beans 08/25/21 < 20 < 23 < 47 < 22 < 61 < 22 < 42 < 26 < 25 < 30 < 90 < 33 < 117 Cabbage 09/29/21 < 28 < 36 < 68 < 37 < 73 < 33 < 52 < 50 < 42 < 32 < 97 < 48 < 160 Swiss Chard 09/29/21 < 26 < 22 < 50 < 28 < 52 < 22 < 42 < 33 < 24 < 25 < 102 < 31 < 116 Swiss Chard 09/29/21 < 26 < 29 < 59 < 26 < 69 < 31 < 42 < 37 < 34 < 28 < 111 < 26 < 154 MEAN CL-118 Cabbage 06/30/21 < 31 < 27 < 76 < 37 < 78 < 37 < 73 < 50 < 40 < 37 < 152 < 36 < 207 Kale 06/30/21 < 26 < 25 < 62 < 23 < 70 < 33 < 54 < 46 < 33 < 31 < 131 < 33 < 177 Swiss Chard 06/30/21 < 31 < 29 < 53 < 23 < 63 < 29 < 45 < 39 < 32 < 28 < 138 < 35 < 167 Broccoli 07/28/21 < 28 < 30 < 44 < 42 < 90 < 31 < 64 < 31 < 30 < 36 < 133 < 29 < 168 Broccoli 07/28/21 < 32 < 30 < 56 < 33 < 73 < 29 < 47 < 33 < 35 < 30 < 110 < 31 < 161 Swiss Chard 07/28/21 < 36 < 34 < 76 < 39 < 63 < 39 < 64 < 37 < 34 < 34 < 103 < 28 < 208 Broccoli 08/25/21 < 32 < 30 < 62 < 28 < 87 < 27 < 46 < 37 < 41 < 28 < 111 < 44 < 162 Broccoli/Swiss Chard 08/25/21 < 37 < 35 < 82 < 40 < 74 < 34 < 56 < 42 < 37 < 38 < 125 < 32 < 242 Swiss Chard 08/25/21 < 36 < 30 < 93 < 41 < 95 < 41 < 52 < 43 < 44 < 39 < 151 < 36 < 221 Broccoli 09/29/21 < 31 < 28 < 68 < 28 < 61 < 31 < 53 < 46 < 32 < 30 < 133 < 42 < 202 Broccoli 09/29/21 < 36 < 34 < 54 < 39 < 76 < 29 < 60 < 55 < 39 < 39 < 138 < 40 < 168 Swiss Chard 09/29/21 < 50 < 42 < 104 < 63 < 106 < 53 < 96 < 57 < 55 < 47 < 240 < 24 < 232 MEAN

Table C-IX.2 CONCENTRATIONS OF GAMMA EMITTERS IN GRASS SAMPLES COLLECTED IN THE VICINITY OF CLINTON POWER STATION, 2021 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-01 05/12/21 < 28 < 29 < 61 < 25 < 74 < 28 < 41 < 31 < 34 < 30 < 93 < 24 < 180 05/26/21 < 36 < 28 < 73 < 29 < 50 < 26 < 44 < 31 < 30 < 29 < 106 < 29 < 177 06/09/21 < 28 < 31 < 52 < 22 < 72 < 30 < 45 < 35 < 26 < 28 < 93 < 25 < 179 06/23/21 < 30 < 37 < 55 < 28 < 56 < 30 < 47 < 41 < 36 < 29 < 96 < 21 < 176 07/07/21 < 27 < 25 < 50 < 16 < 65 < 25 < 36 < 25 < 24 < 27 < 91 < 24 < 149 07/21/21 < 29 < 25 < 60 < 33 < 67 < 35 < 47 < 31 < 31 < 29 < 110 < 30 < 190 08/04/21 < 25 < 32 < 54 < 27 < 62 < 31 < 48 < 26 < 24 < 21 < 109 < 30 < 166 08/18/21 < 34 < 30 < 99 < 29 < 75 < 31 < 67 < 39 < 42 < 36 < 129 < 39 < 210 09/01/21 < 13 < 14 < 39 < 17 < 36 < 15 < 27 < 23 < 15 < 16 < 67 < 19 < 78 09/15/21 < 33 < 35 < 65 < 37 < 76 < 40 < 52 < 48 < 40 < 33 < 132 < 42 < 183 09/29/21 < 33 < 31 < 60 < 27 < 74 < 37 < 56 < 53 < 32 < 32 < 132 < 48 < 209 10/13/21 < 14 < 17 < 31 < 19 < 36 < 17 < 26 < 22 < 16 < 15 < 67 < 24 < 98

(')

I I\)

10/27/21 < 21 < 20 < 44 < 25 < 49 < 24 < 40 < 35 < 21 < 22 < 86 < 31 < 163 0

MEAN CL-02 05/12/21 < 19 < 24 < 41 < 28 < 52 < 16 < 34 < 28 < 18 < 23 < 77 < 26 < 125 05/26/21 < 30 < 23 < 71 < 40 < 80 < 33 < 46 < 30 < 34 < 30 < 110 < 34 < 174 06/09/21 < 22 < 23 < 53 < 22 < 63 < 23 < 41 < 27 < 28 < 22 < 97 < 32 < 157 06/23/21 < 30 < 30 < 88 < 30 < 88 < 36 < 57 < 41 < 40 < 34 < 120 < 34 < 159 07/07/21 < 34 < 31 < 76 < 32 < 76 < 31 < 47 < 38 < 32 < 35 < 114 < 32 < 209 07/21/21 < 28 < 25 < 73 < 28 < 79 < 28 < 35 < 27 < 30 < 25 < 106 < 31 < 162 08/04/21 < 24 < 33 < 67 < 32 < 66 < 26 < 46 < 37 < 33 < 31 < 97 < 39 < 180 08/18/21 < 22 < 22 < 64 < 24 < 74 < 27 < 47 < 35 < 38 < 33 < 108 < 32 < 180 09/01/21 < 14 < 14 < 29 < 13 < 31 < 15 < 26 < 25 < 16 < 14 < 64 < 16 < 102 09/15/21 < 42 < 34 < 83 < 42 < 77 < 38 < 61 < 49 < 39 < 40 < 162 < 59 < 209 09/29/21 < 31 < 34 < 75 < 28 < 74 < 26 < 62 < 56 < 37 < 37 < 145 < 45 < 174 10/13/21 < 26 < 21 < 52 < 20 < 52 < 22 < 47 < 26 < 25 < 25 < 86 < 29 < 148 10/27/21 < 21 < 25 < 39 < 30 < 59 < 25 < 44 < 39 < 26 < 19 < 92 < 27 < 173 MEAN

Table C-IX.2 CONCENTRATIONS OF GAMMA EMITTERS IN GRASS SAMPLES COLLECTED IN THE VICINITY OF CLINTON POWER STATION, 2021 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 05/12/21 < 29 < 27 < 64 < 22 < 68 < 28 < 44 < 22 < 22 < 30 < 92 < 34 < 167 05/26/21 < 31 < 29 < 75 < 33 < 72 < 28 < 48 < 33 < 35 < 32 < 106 < 26 < 196 06/09/21 < 23 < 29 < 69 < 34 < 59 < 27 < 50 < 32 < 31 < 34 < 109 < 48 < 181 06/23/21 < 22 < 25 < 54 < 27 < 65 < 25 < 46 < 39 < 27 < 27 < 92 < 19 < 175 07/07/21 < 36 < 37 < 70 < 38 < 75 < 36 < 55 < 36 < 38 < 33 < 120 < 38 < 229 07/21/21 < 35 < 25 < 72 < 37 < 73 < 40 < 51 < 35 < 45 < 34 < 128 < 23 < 217 08/04/21 < 30 < 39 < 69 < 44 < 87 < 37 < 50 < 32 < 40 < 38 < 115 < 22 < 218 08/18/21 < 35 < 23 < 81 < 53 < 73 < 40 < 62 < 30 < 46 < 47 < 124 < 48 < 202 09/01/21 < 20 < 21 < 42 < 19 < 43 < 21 < 36 < 32 < 21 < 21 < 88 < 27 < 109 09/15/21 < 33 < 33 < 59 < 33 < 70 < 30 < 58 < 51 < 38 < 33 < 140 < 37 < 230 09/29/21 < 29 < 41 < 57 < 40 < 72 < 39 < 65 < 56 < 39 < 32 < 188 < 41 < 180 10/13/21 < 20 < 18 < 41 < 20 < 43 < 22 < 32 < 28 < 21 < 19 < 76 < 23 < 128 0I 10/27/21 < 26 < 32 < 72 < 33 < 75 < 29 < 43 < 38 < 33 < 25 < 92 < 31 < 174 MEAN CL-116 05/12/21 < 22 < 21 < 60 < 22 < 66 < 28 < 45 < 32 < 31 < 30 < 92 < 22 < 170 05/26/21 < 25 < 22 < 45 < 32 < 58 < 20 < 40 < 24 < 29 < 20 < 82 < 20 < 145 06/09/21 < 25 < 26 < 78 < 34 < 70 < 28 < 48 < 27 < 27 < 30 < 92 < 35 < 168 06/23/21 < 30 < 30 < 70 < 32 < 74 < 33 < 47 < 34 < 35 < 33 < 118 < 36 < 175 07/07/21 < 28 < 30 < 70 < 34 < 63 < 28 < 39 < 35 < 36 < 28 < 125 < 20 < 212 07/21/21 < 29 < 33 < 70 < 29 < 81 < 37 < 52 < 36 < 38 < 36 < 146 < 24 < 200 08/04/21 < 29 < 27 < 72 < 33 < 66 < 33 < 42 < 35 < 38 < 29 < 114 < 38 < 179 08/18/21 < 31 < 24 < 71 < 38 < 78 < 34 < 60 < 35 < 36 < 37 < 91 < 34 < 243 09/01/21 < 12 < 12 < 28 < 12 < 26 < 12 < 21 < 21 < 13 < 13 < 54 < 12 < 82 09/15/21 < 32 < 32 < 68 < 35 < 63 < 39 < 59 < 50 < 36 < 34 < 154 < 40 < 217 09/29/21 < 31 < 34 < 80 < 30 < 74 < 29 < 51 < 54 < 30 < 31 < 157 < 61 < 165 10/13/21 < 23 < 25 < 39 < 21 < 51 < 21 < 32 < 22 < 22 < 18 < 81 < 23 < 112 10/27/21 < 20 < 20 < 51 < 17 < 56 < 25 < 38 < 32 < 19 < 21 < 89 < 21 < 128 MEAN

Table C-X.1 QUARTERLY DLR RESULTS FOR CLINTON POWER STATION, 2021 Qtr 1 Qtr 2 Qtr 3 Qtr4 Normalized Annual 111 BA+ Annual Facility Location BA (mrem) (mrem) (mrem) (mrem) Dose, MA (mrem/yr) MDDA121 Dose, FA (mrem)

CL-01 17.1 18.7 19.1 19.6 74.5 74.0 83.6 ND CL-02 17.8 19.2 19.1 17.2 73.3 76.7 86.2 ND CL-03 17.3 22.1 20.7 18.7 78.8 74.7 84.2 ND CL-04 18.3 18.1 19.8 17.5 73.7 72.8 82.3 ND CL-05 18.1 19.2 20.1 19.0 76.4 76.5 86.0 ND CL-06 15.2 16.7 18.0 17.1 67.0 65.8 75.3 ND CL-07 16.6 15.9 17.2 16.4 66.1 69.5 79.0 ND CL-08 17.4 18.7 19.0 17.5 72.6 74.0 83.5 ND CL-11 17.0 17.2 17.6 17.7 69.5 69.3 78.8 ND CL-15 16.6 15.9 16.0 16.7 65.2 66.3 75.8 ND CL-22 18.0 19.4 20.0 19.1 76.5 77.6 87.1 ND CL-23 18.9 19.7 20.2 19.2 78.0 81.5 91.0 ND CL-24 18.6 19.7 20.0 20.2 78.5 80.5 90.0 ND CL-33 18.0 19.4 19.5 17.3 74.2 79.2 88.7 ND CL-34 16.5 18.8 19.2 18.5 73.0 77.5 87.0 ND CL-35 16.6 18.0 19.0 18.7 72.3 71.6 81.1 ND CL-36 17.3 18.4 5.5 17.9 59.1 74.2 83.7 ND CL-37 17.5 20.6 20.1 16.9 75.1 71.1 80.6 ND CL-41 18.8 18.9 21.6 21.0 80.3 79.4 88.9 ND CL-42 18.5 18.8 18.6 19.2 75.1 74.2 83.7 ND CL-43 18.7 19.3 21.9 20.2 80.1 79.7 89.2 ND CL-44 16.8 19.8 17.4 18.3 72.3 75.4 84.9 ND CL-45 19.8 19.2 20.6 19.6 79.2 80.6 90.1 ND CL-46 17.5 20.9 19.3 18.0 75.7 73.0 82.5 ND CL-47 17.4 18.9 19.7 19.1 75.1 79.4 88.9 ND CL-48 18.4 19.0 18.0 17.6 73.0 74.2 83.7 ND CL-49 18.5 20.0 21.5 18.9 78.9 79.8 89.3 ND CL-51 18.8 19.7 20.5 20.6 79.6 76.6 86.1 ND CL-52 16.3 17.2 21.7 20.1 75.3 75.6 85.1 ND CL-53 16.7 20.2 18.6 17.6 73.1 71.9 81.4 ND CL-54 19.8 20.9 21.2 19.1 81.0 78.0 87.5 ND CL-55 20.6 21.4 20.8 20.1 82.9 78.7 88.2 ND CL-56 17.1 19.5 19.9 20.9 77.4 81.0 90.5 ND CL-57 18.9 20.2 19.2 19.4 77.7 81.5 91.0 ND CL-58 18.3 18.4 20.8 20.2 77.7 79.1 88.6 ND CL-60 17.8 20.1 21.1 19.0 78.0 79.0 88.5 ND CL-61 16.5 16.5 18.8 18.9 70.7 78.1 87.6 ND CL-63 17.7 18.9 16.8 17.9 71.3 66.6 76.1 ND CL-64 18.3 18.9 20.4 19.6 77.2 75.9 85.4 ND CL-65 16.6 17.5 20.6 19.2 73.9 80.5 90.01 ND CL-74 17.4 19.1 17.4 17.9 71.8 68 77.51 ND CL-75 17.0 21.1 19.5 18.4 76 75.7 85.21 ND CL-76 17.9 17.4 20.2 19.7 75.2 78.7 88.21 ND CL-77 18.1 19.3 18.7 17.9 74 72.2 81.71 ND CL-78 17.9 18.3 18.6 18.3 73.1 72 81.51 ND CL-79 18.5 18.5 19.2 19.2 75.4 77.1 86.61 ND CL-80 18.7 19.3 18.9 20.0 76.9 75.5 85.01 ND CL-81 17.6 20.8 17.8 17.7 73.9 76.8 86.31 ND CL-84 16.6 15.3 19.3 19.2 70.4 76.3 85.81 ND CL-90 17.0 17.3 14.6 14.8 63.7 62.2 71.71 ND CL-91 19.2 18.6 18.6 17.6 74 69.5 79.01 ND CL-97 15.5 16.0 20.1 19.7 71.3 77.6 87.11 ND CL-99 15.1 16.2 13.0 15.9 60.2 60.6 70.11 ND CL-114 17.4 18.1 19.7 18.1 73.3 72.3 81.8 ND (ll 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 121 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 C-22

FIGURE C-1 MEAN MONTHLY GROSS BETA CONCENTRATION IN AIR PARTICULATE SAMPLES COLLECTED IN THE VICINITY OF CPS, 2021 0.052 0.047 0.042 0.037 M

u E

C.

0.032 0.027 I-j::

0.022 u

< 0.017 0.012 0.007 MONTH PRE-OP (ALL SITES)

_,._ 2021 INDICATOR

-+- 2021 CONTROL C-23

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

IN THE VICINITY OF CPS, 2021 30 25 E

20 a:C1J E

15 10 QUARTER II PRE-OP 2021 indicator 112021 control C-24

APPENDIX D INTER-LABORATORY COMPARISON PROGRAM

Intentionally Left Blank Analytics Environmental Radioactivity Cross Check Program Table D.1 Teledine Brown Enaineerina Environmental Services TBE Identification Known Ratio of TBE to Month/Year Matrix Nuclide Units Reported Evaluation (bJ Number Value (aJ Analytics Result Value March 2021 E13466 Milk Sr-89 pCi/L 84.6 87.1 0.97 A Sr-90 pCi/L 11.5 12.6 0.91 A E13467 Milk Ce-141 pCi/L 111 125 0.89 A Co-58 pCi/L 123 128 0.96 A Co-60 pCi/L 140 154 0.91 A Cr-51 pCi/L 252 242 1.04 A Cs-134 pCi/L 130 151 0.86 A Cs-137 pCi/L 110 110 1.00 A Fe-59 pCi/L 105 109 0.96 A 1-131 pCi/L 77.6 86.9 0.89 A Mn-54 pCi/L 111 112 0.99 A Zn-65 pCi/L 200 211 0.95 A E13468 Charcoal 1-131 pCi 83.5 88.5 0.94 A E13469 AP Ce-141 pCi 103.0 103 1.00 A Co-58 pCi 93.3 105 0.89 A Co-60 pCi 136 126 1.08 A Cr-51 pCi 213 198 1.07 A Cs-134 pCi 123.0 124 0.99 A Cs-137 pCi 86.3 90.1 0.96 A Fe-59 pCi 81.3 89.6 0.91 A Mn-54 pCi 93.5 92.0 1.02 A Zn-65 pCi 166 173 0.96 A E13470 Soil Ce-141 pCi/g 0.232 0.262 0.89 A Co-58 pCi/g 0.251 0.268 0.94 A Co-60 pCi/g 0.306 0.322 0.95 A Cr-51 pCi/g 0.517 0.506 1.02 A Cs-134 pCi/g 0.263 0.317 0.83 A Cs-137 pCi/g 0.278 0.301 0.92 A Fe-59 pCi/g 0.228 0.229 1.00 A Mn-54 pCi/g 0.221 0.235 0.94 A Zn-65 pCi/g 0.448 0.441 1.02 A E13471 AP Sr-89 pCi 92.2 95.5 0.97 A Sr-90 pCi 11.7 13.9 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 (Page 1 of 2)

Analytics Environmental Radioactivity Cross Check Program Table D.1 Teledine Brown En9ineerin9 Environmental Services TBE Known Identification Ratio of TBE to Month/Year Matrix Nuclide Units Reported Evaluation (bl Number Value (al Analytics Result Value September 2021 E13472 Milk Sr-89 pCi/L 66.4 85.4 0.78 w Sr-90 pCi/L 11.9 14.0 0.85 A E13473 Milk Ce-141 pCi/L 118 114 1.03 A Co-58 pCi/L 116 118 0.98 A Co-60 pCi/L 142 145 0.9§ A Cr-51 pCi/L 244 236 1.03 A Cs-134 pCi/L 81 93.1 0.87 A Cs-137 pCi/L 105 112 0.94 A Fe-59 pCi/L 105 102 1.03 A 1-131 pCi/L 65.1 85.6 0.76 w Mn-54 pCi/L 128 128 1.00 A Zn-65 pCi/L 158 153 1.03 A E13474 Charcoal 1-131 pCi 85.2 90.9 0.94 A E13475 AP Ce-141 pCi 126 135 0.94 A Co-58 pCi 148 139 1.07 A Co-60 pCi 183 171 1.07 A Cr-51 pCi 322 278 1.16 A Cs-134 pCi 118 110 1.08 A Cs-137 pCi 147 132 1.12 A Fe-59 pCi 131 120 1.09 A Mn-54 pCi 161 151 1.06 A Zn-65 pCi 202 180 1.12 A E13476 Soil Ce-141 pCi/g 0.215 0.219 0.98 A Co-58 pCi/g 0.208 0.226 0.92 A Co-60 pCi/g 0.277 0.277 1.00 A Cr-51 pCi/g 0.388 0.452 0.86 A Cs-134 pCi/g 0.157 0.178 0.88 A Cs-137 pCi/g 0.270 0.284 0.95 A Fe-59 pCi/g 0.218 0.195 1.12 A Mn-54 pCi/g 0.239 0.246 0.97 A Zn-65 pCi/g 0.312 0.293 1.06 A E13477 AP Sr-89 pCi 85.6 68.3 1.25 w Sr-90 pCi 12.6 11.2 1.13 A (a) The Analytics known value is equal to 100% of the parameter presentin 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 (Page 2 of 2)

DOE's Mixed Analyte Performance Evaluation Program (MAPEP)

Table D.2 Teled)l'.ne Brown Engineering Environmental Services TBE Identification Known Acceptance Month/Year Matrix Nuclide Units Reported Evaluation (bl Number Value (a) Range Value February 2021 21-GrF44 AP Gross Alpha Sq/sample 0.371 1.77 0.53 - 3.01 N(3J Gross Beta Sq/sample 0.731 0.65 0.325 - 0.974 A 21-MaS44 Soil Ni-63 Bq/kg 310 689.0 482 - 896 Nl"J Tc-99 Bq/kg 457 638 447 - 829 w 21-MaSU44 Urine Cs-134 Bq/L 2.34 2.73 1.91 - 3.55 A Cs-137 Bq/L 2.54 2.71 1.90 - 3.52 A Co-57 Bq/L 0.4100 (1) A Co-60 Bq/L 2.24 2.44 1.71-3.17 A Mn-54 Bq/L 2.03 2.03 1.42 - 2.64 A K-40 Bq/L 52.8 54.0 70 A U-234 Bq/L 0.108 0.0877 0.0614-0.114 w U-238 Bq/L 0.101 0.091 0.064 -0.118 A Zn-65 Bq/L 1.06 1.34 (2) A 21-MaW44 Water Ni-63 Bq/L 6.7 8.2 5.7-10.7 A Tc-99 Bq/L 3.850 4.01 2.81 - 5.21 A 21-RdV44 Vegetation Cs-134 Sq/sample 3.13 3.60 2.5 - 4.7 A Cs-137 Sq/sample 4.64 4.69 3.28- 6.10 A Co-57 Sq/sample 5.25 5.05 3.54 - 6.57 A Co-60 Sq/sample 2.86 2.99 2.09 - 3.89 A Mn-54 Sq/sample 5.02 5.25 3.68 - 6.83 A Sr-90 Sq/sample 0.631 0.673 0.471 - 0.875 A Zn-65 Sq/sample -0.233 (1) A August 2021 21-GrF45 AP Gross Alpha Sq/sample 0.368 0.960 0.288 - 1.632 A Gross Beta Sq/sample 0.595 0.553 0.277 - 0.830 A 21-MaS45 Soil Ni-63 Bq/kg 546 1280 896 - 1664 N\OJ Tc-99 Bq/kg 453 777 544 - 1010 N\OJ 21-MaSU45 Urine Cs-134 Bq/L 3.10 3.62 2.53 - 4.71 A Cs-137 Bq/L 0.083 (1) A Co-57 Bq/L 0.844 0.87 0.606-1.125 A Co-60 Bq/L 0.0535 (1) A Mn-54 Bq/L 0.459 0.417 (2) A K-40 Bq/L 48.8 54.0 38- 70 A U-234 Bq/L 0.133 0.116 0.081 - 0.151 A U-238 Bq/L 0.137 0.121 0.085- 0.157 A Zn-65 Bq/L 0.339 0.420 (2) A 21-MaW45 Water Ni-63 Bq/L 33.5 39.5 27.7-51.4 A Tc-99 Bq/L 3.5 3.7 2.60 - 4.82 A 21-RdV45 Vegetation Cs-134 Sq/sample 3.42 4.34 3.04 - 5.64 *W Cs-137 Sq/sample 2.14 2.21 1.55 - 2.87 A Co-57 Sq/sample 4.08 4.66 3.26 - 6.06 A Co-60 Sq/sample 2.81 3.51 2.46 -4.56 A Mn-54 Sq/sample 0.035 (1) A Sr-90 Sq/sample 1.15 1.320 0.92 - 1.72 A Zn-65 Sq/sample 2.05 2.43 1.70-3.16 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) OOEIMAPEP evaluation:

A= Acceptable - reported result falls within ratio limits of0.80-1.20 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) False positive test (2) Sensitivity evaluation (3) See NCR 21-02 (4) See NCR 21-03 (5) See NCR 21-13 (6) Tc-99 cross-checks done for TBE information only- not required (Page 1 of 1)

ERA Environmental Radioactivity Cross Check Program Table D.3 Teledyne Brown Engineering Environmental Services TBE Identification Known Acceptance Month/Year Matrix Nuclide Units Reported Evaluation (bl Number Value (a) Limits Value March 2021 MRAD-34 Water Am-241 pCi/L 175 157 108 - 201 A Fe-55 pCi/L 579 275 162 - 400 Nl1J Pu-238 pCi/L 181 171 103 - 222 A Pu-239 pCi/L 153 142 87.9-175 A Soil Sr-90 pCi/kg 6570 9190 2860 - 14,300 A AP Fe-55 pCi/filter 107 121 44.2 - 193 A U-234 pCi/filter 25.99 25.5 18.9- 29.9 A U-238 pCi/filter 24.7 25.3 19.1 - 30.2 A April 2021 RAD-125 Water Ba-133 pCi/L 92.3 90.5 76.2- 99.6 A Cs-134 pCi/L 62.9 70.5 57.5 - 77.6 A Cs-137 pCi/L 161 168 151 -187 A Co-60 pCi/L 22.5 20.9 17.7 - 25.8 A Zn-65 pCi/L 183 177.0 159 - 208 A GR-A pCi/L 30.8 30.2 15.4 - 39.4 A GR-B pCi/L 60.1 67.5 46.8 - 74.2 A LI-Nat pCi/L 36.45 36.9 30.0 - 40.8 A H-3 pCi/L 13,400 14,600 12,800 -16,100 A Sr-89 pCi/L 64.5 63.5 51.4- 71.5 A Sr-90 pCi/L 22.8 23.0 16.5 - 27.0 A 1-131 pCi/L 28.2 26.7 22.2 - 31.4 A September 2021 MRAD-35 Water Am-241 pCi/L 68 63.7 43.7 - 81.5 A Fe-55 pCi/L 179 246 145 - 358 A Pu-238 pCi/L 102 114 68.5 - 148 A Pu-239 pCi/L 32 34.3 21.2 - 42.3 A Soil Sr-90 pCi/kg 6160 6090 1,900 - 9,490 A AP Fe-55 pCi/filter 493 548 200 - 874 A Pu-238 pCi/filter 28 28.5 21.5 - 35.0 A Pu-239 pCi/filter 21 21.6 16.1 -26.1 A U-234 pCi/filter 7.95 7.76 5.75 - 9.09 A U-238 pCi/filter 8.0 7.69 5.81 - 9.17 A October 2021 RAD-127 Water Ba-133 pCi/L 82.8 87.5 73.6 - 96.2 A Cs-134 pCi/L 64.0 70.1 57.1 - 77.1 A Cs-137 pCi/L 145 156 140 - 174 A Co-60 pCi/L 83.2 85.9 77.3 - 96.8 A Zn-65 pCi/L 133 145 130-171 A GR-A pCi/L 76.0 66.7 35.0 - 82.5 A GR-B pCi/L 63.0 55.7 38.1 - 62.6 Nl')

LI-Nat pCi/L 52.88 55.5 45.3 - 61.1 A H-3 pCi/L 13,800 17,200 15,000 - 18,900 Nl"J Sr-89 pCi/L 54.9 61.0 49.1 - 68.9 A Sr-90 pCi/L 24.8 29.3 21.3 - 34.0 A 1-131 pCi/L 27.4 26.4 21.9-31.1 A December 2021 QR 120121Y Water GR-B pCi/L 47.6 39.8 26.4- 47.3 Nl4J H-3 pCi/L 17,500 17,800 15,600 - 19,600 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 21-01 (2) See NCR 21-10 (3) See NCR 21-11 (4) See NCR 21-14 (Page 1 of 1)

APPENDIX E ERRATA DATA

Intentionally Left Blank There was no errata data for 2021.

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) ............................................................. 8 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, 2021 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, 2021 Table B-1.2 Concentrations of Gamma Emitters in Groundwater Samples Collected in the Vicinity of Clinton Power Station, 2021 Table B-1.3 Concentrations of Hard To Detects in Groundwater Samples Collected in the Vicinity of Clinton Power Station, 2021 Table B-I1.1 Concentrations of Tritium in Surface Water Samples Collected in the Vicinity of Clinton Power Station, 2021 Table B-II1.1 Concentrations of Tritium in Precipitation Water Samples Collected in the Vicinity of Clinton Power Station, 2021 ii

I. Summary and Conclusions In 2006, 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 2021. During that time period, 129 analyses were performed on 72 samples from 28 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 2021.

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, Exelon 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 or surface water 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 two of seventeen groundwater monitoring locations. The tritium concentrations ranged from 243 +/- 128 pCi/L to 1,500 +/- 219 pCi/L. Tritium was not detected in any precipitation water samples.

II. Introduction The Clinton Power Station (CPS), consisting of one approximately 1,140 MW gross electrical power output boiling water reactor is located in Harp Township, DeWitt County, Illinois. CPS is owned and operated by Exelon 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 Exelon. 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 2021.

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. Exelon 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 (3He). This radioactive decay releases a beta particle (low-energy electron). The radioactive decay of tritium is the source of the health risk from exposure to tritium. Tritium is one of the least dangerous radionuclides because it emits very weak 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 2021. 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 B. 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. Exelon reports the uncertainty of a measurement created by statistical process (counting error) as well as all sources of error (Total Propagated Uncertainty or TPU). Each result has two values calculated. Exelon reports the TPU by following the result with plus or minus +/- the estimated sample standard deviation, as TPU, that is obtained by propagating all sources of analytical uncertainty in measurements.

Analytical uncertainties are reported at the 95% confidence level in 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 an Exelon specified LLD of 200 pCi/L. Typically, the lowest positive measurement will be reported within a range of 40 - 240 pCi/L or 140 +/- 100 pCi/L. Clearly, these sample results cannot be distinguished as different from background at this concentration.

IV. Results and Discussion A. Program Exceptions

1. Sample Anomalies There were no sample anomalies in 2021.

2. Missed Samples There were no missed samples in 2021.

B. Program Changes There were no program changes in 2021.

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 Exelon-imposed LLD of 200 pCi/1 to 1,500 pCi/1. (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 No plant-produced radionuclides were detected.

(Table B-1.2, Appendix B)

Hard-to-Detect Hard-to-Detect analyses were not performed in 2021. (Table B-1.3 Appendix B)

D. Surface Water Results There were no surface water samples analyzed 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 one samples at a concentration of 194 pCi/L. (Table B-II1.1, 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 2021.

H. Leaks, Spills, and Releases There were no leaks, spills or releases in 2021.

I. Trends No trends have been identified in 2021.

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 2021.

2. Installation of Monitoring Wells No new wells were installed during the 2021.

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, 2021 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-W Precipitation Water RG-WNW Precipitation Water RG-WSW Precipitation Water A-1

Figure A- 1 Onsite Sampling Locations at Clinton Power Station

l>

I c,J Figure A- 2 Sampling Locations South of Clinton Power Station

0 F.

Sampling L . igure A - 3 ocat1ons East of Cl"mton Power Station

Figure A-4 Recapture Sampling Locations of Clinton Power Station A-5

Intentionally Left Blank APPENDIX 8 DATA TABLES OF THE ANNUAL RADIOLOGICAL GROUNDWATER PROTECTION PROGRAM REPORT (ARGPPR)

Intentionally left blank TABLE 8-1.1 CONCENTRATIONS OF TRITIUM, STRONTIUM AND GROSS ALPHA IN GROUNDWATER SAMPLES COLLECTED IN THE VICINITY OF CLINTON POWER STATION, 2021 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION SITE DATE H-3 Sr-89 Sr-90 Gr-A (Dis) Gr-A (Sus)

B-3 04/28/21 < 191 MW-CL-1 04/28/21 < 193 MW-CL-2 04/28/21 < 195 MW-CL-12I 03/03/21 < 186 MW-CL-12I 04/28/21 < 195 < 7.9 < 0.9 < 0.9 < 1.1 MW-CL-12I 07/27/21 < 190 MW-CL-12I 11/03/21 < 193 MW-CL-13I 04/28/21 < 195 MW-CL-13S 03/03/21 < 182 MW-CL-13S 04/28/21 < 198 < 7.3 < 0.9 < 1.0 < 1.1 MW-CL-13S 07/27/21 < 185 MW-CL-13S 11/03/21 < 190 MW-CL-14S 03/04/21 1500 +/- 219 MW-CL-14S 04/08/21 502 +/- 145 MW-CL-14S 04/29/21 249 +/- 130 < 7.4 < 0.9 < 0.8 < 1.1 MW-CL-14S 07/28/21 243 +/- 128 MW-CL-14S 11/04/21 < 190 MW-CL-15I 04/28/21 < 194 MW-CL-15S 04/28/21 < 191 MW-CL-16S 03/04/21 < 181 MW-CL-16S 04/29/21 332 +/- 129 < 8.6 < 0.9 1.1 +/- 0.7 < 1.1 MW-CL-16S 07/28/21 258 +/- 129 MW-CL-16S 11/04/21 < 187 MW-CL-17S 03/04/21 < 184 MW-CL-17S 04/29/21 < 192 < 9.0 < 0.8 < 1.8 < 1.1 MW-CL-17S 07/28/21 < 187 MW-CL-17S 11/04/21 < 198 MW-CL-18I 03/04/21 < 184 MW-CL-18I 04/29/21 < 192 < 7.7 < 0.8 < 1.1 < 1.0 MW-CL-18I 07/28/21 < 185 MW-CL-18I 11/04/21 < 195 MW-CL-1,8S 03/04/21 < 182 MW-CL-18S 04/29/21 < 189 < 9.2 < 0.9 < 1.2 < 1.0 MW-CL-18S 07/28/21 < 174 MW-CL-18S 11/04/21 < 196 MW-CL-19S 03/03/21 < 173 MW-CL-19S 04/28/21 < 192 < 6.8 < 0.8 < 2.3 < 1.0 MW-CL-19S 07/27/21 < 180 MW-CL-19S 11/03/21 < 187 MW-CL-20S 04/28/21 < 193 MW-CL-21S 03/03/21 < 183 MW-CL-21S 04/28/21 < 194 < 7.6 < 0.8 < 1.1 < 1.0 MW-CL-21S 07/27/21 < 174 MW-CL-21S 11/03/21 < 198 MW-CL-22S 03/04/21 < 182 MW-CL-22S 04/29/21 < 193 < 7.9 < 0.8 < 1.7 < 1.0 MW-CL-22S 07/28/21 < 197 MW-CL-22S 11/04/21 < 196 B-1

Table 8-1.2 CONCENTRATIONS OF GAMMA EMITTERS IN GROUNDWATER SAMPLES COLLECTED IN THE VICINITY OF CLINTON POWER STATION, 2021 RESULTS IN UNITS OF PCI/LITER + SIGMA COLLECTION SITE DATE Be-7 K-40 Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 Cs-134 Cs-137 Ba-140 La-140 B-3 04/28/21 < 20 < 22 <2 < 2 < 5 <2 <4 <2 <4 <2 <2 < 11 < 3 MW-CL-1 04/28/21 < 14 < 17 <2 < 2 <4 <2 <4 < 2 < 3 < 2 <2 < 8 < 3 MW-CL-2 04/28/21 < 15 < 32 < 2 < 2 < 3 < 2 <4 < 2 < 3 < 2 <2 < 9 < 3 MW-CL-12I 04/28/21 < 18 < 21 < 2 < 2 < 5 < 2 <4 < 2 <4 <2 < 2 < 10 < 3 MW-CL-13I 04/28/21 < 16 < 32 < 2 < 2 <4 < 2 <4 <2 <3 <2 < 2 < 9 < 3 MW-CL-13S 04/28/21 < 12 < 18 < 1 < 1 < 3 < 1 < 2 < 1 <2 < 1 < 1 <6 < 2 MW-CL-14S 04/29/21 < 14 < 30 <2 <2 < 3 <2 < 3 <2 < 3 <2 <2 < 8 < 3 MW-CL-15I 04/28/21 < 18 < 39 <2 <2 < 5 <2 <4 <2 <4 <2 <2 < 10 <4 MW-CL-15S 04/28/21 < 17 < 17 <2 < 2 <4 < 2 <4 <2 < 3 < 2 <2 < 10 < 3 MW-CL-16S 04/29/21 < 14 < 29 <2 < 2 <4 <2 < 3 <2 < 3 < 2 < 2 < 9 < 3 MW-CL-17S 04/29/21 < 13 < 25 < 2 < 1 < 3 < 2 < 3 < 2 < 3 <2 < 2 < 7 < 3 MW-CL-18I 04/29/21 < 23 < 44 < 2 < 2 < 5 < 3 < 5 < 3 < 5 < 3 < 3 < 13 < 5 Ill I

MW-CL-18S 04/29/21 < 16 < 33 < 2 < 2 <4 < 2 <4 <2 <3 <2 <2 < 9 <4 I\)

MW-CL-19S 04/28/21 < 17 < 32 <2 <2 < 4 <2 <4 <2 <3 <2 < 2 < 10 < 3 MW-CL-20S 04/28/21 < 12 < 12 < 1 < 1 < 2 < 1 < 2 < 1 < 3 < 1 < 1 < 7 <2 MW-CL-21S 04/28/21 < 15 < 15 <2 < 2 < 3 <2 < 3 <2 < 3 <2 <2 < 8 < 3 MW-CL-22S 04/29/21 < 14 < 34 <2 < 2 < 3 < 2 < 3 < 2 < 3 <2 < 2 < 8 < 3

TABLE 8-1.3 CONCENTRATIONS OF HARD TO DETECTS IN GROUNDWATER SAMPLES COLLECTED IN THE VICINITY OF CLINTON POWER STATION, 2021 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA There were no HTD Samples analyzed in 2021 c:o I

c,J

TABLE 8-11.1 CONCENTRATIONS OF TRITIUM IN SURFACE WATER SAMPLES COLLECTED IN THE VICINITY OF CLINTON POWER STATION, 2021 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA There were no Surface Water Samples analyzed in 2021 8-4

TABLE B-111.1 CONCENTRATIONS OF TRITIUM IN PRECIPITATION WATER SAMPLES COLLECTED IN THE VICINITY OF CLINTON POWER STATION, 2021 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION SITE DATE H-3 RG-E 06/22/21 < 181 RG-E 12/29/21 < 179 RG-ENE 06/22/21 194 +/- 119 RG-ENE 12/29/21 < 191 RG-ESE 06/22/21 < 192 RG-ESE 12/29/21 < 184 RG-N 06/22/21 < 173 RG-N 12/29/21 < 180 RG-NE 06/22/21 < 177 RG-NE 12/29/21 < 192 RG-NNW 06/22/21 < 198 RG-NNW 12/29/21 < 184 RG-S 06/22/21 < 179 RG-S 12/29/21 < 182 RG-SE 06/22/21 < 197 B-5

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