ML20132A104

Annual Radiological Environmental Operation Report

ML20132A104
Person / Time
Site:	Clinton
Issue date:	04/30/2020
From:	Teledyne Brown Engineering Environmental Services
To:	Office of Nuclear Reactor Regulation
References
U-604545
Download: ML20132A104 (118)

Text

11& f, u@ MJMM& << t 1 1& t + ,,j,,@N£¥+& P&d wx - WJrMWii#h+/- t tt M& ,w@ t-Wk ,wvwt+t , &¥ -@-, ,;, , "ii t&,, 'thh1f<&f#¥ & 'tihl ,,-¥¥& 1,t, ,,t+r +zm January 01, 2019 - December 31, 2019 ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERA TING REPORT CLINTON POWER STATION - DOCKET NUMBER 50-461 Prepared by:

Teledyne Brown Engineering Environmental Services April 2020

Intentionally left blank Table Of Contents I. Summary and Conclusions .............................................................................................. 1 II. Introduction ..................................................................................................................... 2 A. Objectives of the REMP ...................................................................................... 2 B. Implementation of the Objectives ........................................................................ 2 Ill. Program Description ..........*............................................................................................ 3 A. Sample Collection ............................................................................................... 3 B. Sample Analysis .................................................................................................. 5 C. Data Interpretation .............................................................................................. 5 D. Program Exceptions ............................................................................................ 6 E. Program Changes ............................................................................................. 10 IV. Results and Discussion ............................................................................................... 10 A. Aquatic Environment ......................................................................................... 10

1. Surface Water ......................................................................................... 10

2. Drinking Water ........................................................................................ 11

3. Well Water ............................................................................................. 11

4. Fish ......................................................................................................... 12

5. Shoreline Sediment ................................................................................ 12 B. Atmospheric Environment ................................................................................. 12 1 . Airborne .................................................................................................. 12

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

b. Airborne Iodine ............................................................................ 13

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

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

b. Food Products ............................................................................. 14

c. Grass ........................................................................................... 14 C. Ambient Gamma Radiation ............................................................................... 14 D. Independent Spent Fuel Storage (ISFSI) ......................................................... 15 E. Land Use Survey ............................................................................................... 15 F. Errata Data ........................................................................................................ 16 G. Summary of Results - Inter-laboratory Comparison Program ......................... 16 V. References ................................................................................................................... 19

Appendices Appendix A Radiological Environmental Monitoring Report Summary Tables Table A-1 Radiological Environmental Monitoring Program Annual Summary for the Clinton Power Station, 2019 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, 2019 Table 8-2 Radiological Environmental Monitoring Program - Summary of Sample Collection and Analytical Methods, Clinton Power Station, 2019 Figures Figure 8-1. Environmental Sampling Locations Within One Mile of the Clinton Power Station, 2019 Figure B-2 Environmental Sampling Locations Between One and Two Miles from the Clinton Power Station, 2019 Figure 8-3 Environmental Sampling Locations Between Two and Five Miles from the Clinton Power Station, 2019 Figure 8-4 Environmental Sampling Locations Greater Than Five Miles from the Clinton Power Station, 2019 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, 2019 Table C-1.2 Concentrations of Tritium in Surface Water Samples Collected in the Vicinity of Clinton Power Station, 2019 Table C-1.3 Concentrations of Gamma Emitters in Surface Water Samples Collected in the Vicinity of Clinton Power Station, 2019 Table C-11.1 Concentrations of Gross Beta in Drinking Water Samples Collected in the Vicinity of Clinton Power Station, 2019 ii

Table C-11.2 Concentrations of Tritium in Drinking Water Samples Collected in the Vicinity of Clinton Power Station, 2019 Table C-11.3 Concentrations of 1-131 in Drinking Water Samples Collected in the Vicinity of Clinton Power Station, 2019 Table C-11.4 Concentrations of Gamma Emitters in Drinking Water Samples Collected in the Vicinity of Clinton Power Station, 2019 Table C-111.1 Concentrations of Tritium in Well Water Samples Collected in the Vicinity of Clinton Power Station, 2019 Table C-111.2 Concentrations of Gamma Emitters in Well Water Samples Collected in the Vicinity of Clinton Power Station, 2019 Table C-IV.1 Concentrations of Gamma Emitters in Fish Samples Collected in the Vicinity of Clinton Power Station, 2019 Table C-V.1 Concentrations of Gamma Emitters in Sediment Samples Collected in the Vicinity of Clinton Power Station, 2019 Table C-Vl.1 Concentrations of Gross Beta in Air Particulate Samples Collected in the Vicinity of Clinton Power Station, 2019 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, 2019 Table C-Vl.3 Concentrations of Gamma Emitters in Air Particulate Samples Collected in the Vicinity of Clinton Power Station, 2019.

Table C-Vll.1 Concentrations of 1-131 in Air Iodine Samples Collected in the Vicinity of Clinton Power Station, 2019 Table C-Vlll.1 Concentrations of 1-131 in Milk Samples Collected in the Vicinity of Clinton Power Station, 2019 Table C-Vlll.2 Concentrations of Gamma Emitters in Milk Samples Collected in the Vicinity of Clinton Power Station, 2019 Table C-IX.1 Concentrations of Gamma Emitters in Vegetation Samples Collected in the Vicinity of Clinton Power Station, 2019 Table C-IX.2 Concentrations of Gamma Emitters in Grass Samples Collected in the Vicinity of Clinton Power Station, 2019 Table C-X.1 Quarterly DLR Results for Clinton Power Station, 2019 iii

Figures Figure C-1 Mean Monthly Gross Beta Concentrations in Air Particulate Samples Collected in the Vicinity of CPS, 2019 Figure C-2 Mean Quarterly Ambient Gamma Radiation Levels (DLR) *in the Vicinity of CPS, 2019 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, 2019 through December 31, 2019.

During that time period, 1,591 analyses were performed on 1,464 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 2019. 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 2019 due to the release of gaseous effluents from CPS was 3.89E-02 or 0.0389 mRem.

Surface, drinking, and well water samples were analyzed for concentrations of tritium and gamma-emitting nuclides. Drinking water samples were also analyzed for concentrations of gross beta and lodine-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, 2019 through December 31, 2019.

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 2019. 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 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-078 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 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 four locations (CL-114, CL-115, CL-117 and CL-118). The control location was CL-114, which is located 12.5 miles upwind of the station. Various broadleaf 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 the environmental samples for radioactivity for the CPS REMP in 2019. 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 and air particulates

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, malfunction of automatic sampling equipment and other legitimate reasons" .... The below section addresses the reporting requirements found within Section 6.0 of the Station's ODCM.

Exceptions/Anomalies

1. IR 4216350 Scheduled Sampling Delayed Due to Weather 01/31/2019 - WOs 4870408 (Surface Water Monitoring), 4880369 (Airborne Iodine/Particulate), and 4870407 (Milk Monitoring) were all scheduled to be worked by the Environmental Inc. sampling vendor on Wednesday, 01/30/19. With the extreme low temperatures reaching a wind chill of-40° F, the work was rescheduled to 01/31/19 due to the hazardous conditions. Stay times at these low temperatures were not conducive with the outside environmental sampling, so rescheduling the work caused extended sampler timers (approximately 192 hours0.00222 days <br />0.0533 hours <br />3.174603e-4 weeks <br />7.3056e-5 months <br /> were noted rather than the typical 168 hours0.00194 days <br />0.0467 hours <br />2.777778e-4 weeks <br />6.3924e-5 months <br />).

2. IR 4243360 ODCM Drinking Water Compositor, CL-14, Outage 04/24/2019 - During the 12kV outage, the ODCM drinking water compositor CL-14 located in the Service Building was secured on 4/18/19 at 07:58. Securing the compositor does not allow the 20 ml per hour sample to be obtained. On 04/24/19, the Environmental Inc.

sampling vendor collected the monthly composite sample but had to take an additional grab sample to make up for the missed 20 ml per hour samples since the outage began. The sample volume is adequate for proper analysis, but this additional grab sample does not constitute as a 'composite' sample since it was not obtained over a period of time.

3. IR 4245299 Non-ODCM CL-99 Water Compositor Found Flooded 05/01/2019 - During the weekly inspection of the water compositors, the sampling vendor from Environmental Inc. identified the non-ODCM water compositor and access point flooded. CL-99 is located approximately 3.5 miles upstream from the station and serves as an additional control (background) water sampler to make comparisons against the ODCM Composite Sampler CL-90. This affected the May composite sample, and a subsequent grab sample was obtained once the waters resided. *

4. IR4252847 Duplicate TLD Not Received From Vendor & Compositor Repair Impact on April CL-91 Composite Sample 05/30/2019 - When performing the quarterly TLD exchange, it was noted that there was only one TLD allocated for location CL-01 from the vendor, Landauer. CL-01 is an ODCM required location approximately 1.8 n,iles W of the station. Typically, there are two TLDs allocated and placed at each monitoring location. Since there was only one for CL-01, the sampling vendor was instructed to replace the second missing TLD with the TLD labeled Spare-01. Both TLDs (one labeled CL-01 and one labeled Spare-01) were placed out in the field at the same time, so there should be no impacts to the dose collected.

Four spare TLDs are sent each quarter from the vendor for situations as this where replacement of TLDs is required.

Also, when performing the weekly water compositor check, water compositor CL-91 was sent off for repair during the weekly compositor inspection. CL-91 is an ODCM required upstream surface water sampler located 6.1 miles ENE of the station that collects 20 ml aliquots every hour throughout the month. The repairs took two weeks, so grab samples were obtained on 4/03/2019 and 4/10/2019. The April composite sample will not meet the definition of a composite sample due to the grabs taken on these dates.

5. IR4268503 ODCM Air Samplers CL-2 and CL-3 Loss of Power 7/31/2019 - During the weekly ODCM air sampling surveillance on Wednesday, 7/31/19, the Environmental Inc. sampling vendor identified that two ODCM sample compositors CL-2 (location off of the main access road) and CL-3 (location on wren road) had no power.

The timer and pump were off indicating power outage at the location.

Collection was adequate for sample analysis.

6. IR 4268685 ODCM: Insufficient Vegetation for the July, 2019 REMP Sampling 7/31/2019 - During the vegetation sampling on 07/31/19, the vendor collector could not obtain enough cabbage sample for the July monthly sample at CL-114. The vendor was able to obtain the little amount of cabbage that was left and gathered extra lettuce as a substitute to complete the amount of vegetation required for analysis.

7. IR 4270243 ODCM Water Compositor CL-91 Found with Jammed Pump 08/07/2019 - While performing weekly checks of the supplemental ODCM water compositors, CL-91, the vendor found that the pump had jammed and needed to be replaced. The vendor replaced the pump but had to obtain a supplemental grab sample from the process stream to add to the monthly collection container.

8. IR 4282220 ODCM: Insufficient Vegetation for September, 2019 REMP Sampling 09/25/2019 - During the September vegetation sampling, the vendor collector was required to obtain substitute samples. Since September is the end of harvest season, three differing types of broadleaves could not be collected at the sampling locations, CL-114, CL-115, CL-117 and CL-118. Enough sample was obtained at each location for analysis, but not all gardens had three differing types of broadleaf vegetation as required.

9. IR 4293189 ODCM Water Compositor CL-90 Found Without Power 10/30/2019 - The Environmental Inc. vendor notified chemistry management on that CL-90 water compositor did not have power. The vendor was able to obtain the required amount of weekly sample for the week of 10/30/19, but the power needed to be restored.

1O. IR 4295194 ODCM Water Compositor CL-90 Sample Volume Less Than Adequate 11/06/2019 - During the weekly checks of the ODCM water compositor CL-90, located 0.4 miles SE downstream from the station, the vendor observed the compositor to have less than the weekly composite sample collection volume for the monthly analysis. A supplemental grab sample was obtained from the process stream and added to the monthly collection container. The cause for the less than normal weekly compositor collection was due to two power outages at the flume detox building between 10/30/19 to 11/01/19 (reference work order 4975036 and IR 4292855) that also caused a power outage at the CL-90 ODCM water compositor that are fed from the same power source. Power was restored prior to the following sampling collection.

11. IR 4298823 ODCM and Non-ODCM Air Sampler Issues 11/20/2019 - During the weekly ODCM air sampling surveillance on Wednesday, 11/20/19, the Environmental Inc. sampling vendor identified that all the samples were satisfactory except for CL-1 and CL-94. CL-1 is located approximately 1.8 miles west of the plant near the gate to Camp Quest south of Birkbeck. CL-1 had a timer shortage due to a power outage on Sunday, 11 /17 /19. The sample was still enough for analysis. CL-94 also had a timer shortage, but sufficient sample was obtained for analysis.

Throughout 2019, the following IRs were generated to document Program exceptions that were entered into the corrective action program for trending purposes.

Missed Samples

1. IR 4216350 No Sample Obtained at CL-13 Surface Water 01/31/19 - While performing Surface Water Sampling WO 4870408, the sample at the non-ODCM location CL-13, was not obtained due to a frozen lake. CL-13 is a monthly surface water grab sample located approximately 3.6 miles SW oft the plant off of Salt Creek Bridge.

2. IR 4298823 ODCM and Non-ODCM Air Sampler Issues 11/20/2019 - During the weekly ODCM air sampling surveillance on Wednesday, 11 /20/19, the Environmental Inc. sampling vendor identified that CL-11 was found with the power cord ajar. The vendor plugged in the power cord and it is now working, but the weekly sample could not be obtained. CL-11 is located approximately 16 miles south of the plant.

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 2019.

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 (Tables C-11.1, Appendix C). No gross beta was detected in any of the samples.

Tritium Monthly samples were composited quarterly and analyzed for tritium activity (Table C-11.2, Appendix C). No tritium was detected in any samples and the required LLD was met.

lodine-131 Monthly samples from location CL-14 were analyzed for 1-131 activity (Table C-11.3, Appendix C). No 1-131 was detected in any samples and the required LLD was met.

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

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

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

(Table C-111.1, Appendix C)

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

4. Fish Fish samples comprised of largemouth bass, channel catfish, bluegill, carp, white crappies 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 31 E-3 pCi/m 3 with a mean of 16 E-3 pCi/m 3 . The results from the Intermediate Distance location (Group 11) ranged from 7 to 29 E-3 pCi/m 3 with a mean of 15 E-3 pCi/m 3 . The results from the Control locations (Group Ill) ranged from 6 to 32 E-3 pCi/m 3 with a mean of 16 E-3 pCi/m 3 . Comparison of the 2019 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 2019 indicate no notable differences among the three groups.

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

(Table C-Vl.3, Appendix C)

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

(Table C-Vll.1, Appendix C)

2. Terrestrial

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

lodine-131 Milk samples were analyzed for concentrations of 1-131 lodine-131 was not detected in any of the samples. The required LLD was met. (Table C-Vlll.1, Appendix C).

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

b. Food Products Broadleaf vegetation samples were collected from four locations (CL-114, CL-115, CL-117 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 nuqlides. 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 to C-X.3, Appendix C.

A total of 216 OSLO measurements were made in 2019. The average dose from the inner ring was 18.9 mRem/quarter. The average dose from the outer ring was 19.3 mRem/quarter. The average dose from the special interest group was 18.9 mRem/quarter. The average dose from the supplemental group was 17.8 mRem/quarter. The quarterly measurements ranged from 13.5 to 23.6 mRem/quarter.

The inner ring and outer ring measurements compared well to the Control Station, CL-11, which ranged from 15.9 to 18.6 mRem/quarter with 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 December, 18, 2019. The purpose of the survey was to document the nearest resident, milk-producing animal and garden of greater than 50 m 2 in each of the sixteen 22 ~ 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 1.5 1.5 1.5 2 NNE 1.5 >8 >8 3 NE 2.1 3.5 >8 4 ENE 2.9 4.3 >8 5 E 1.7 1.7 >8 6 ESE 5.1 7.7 >8 7 SE 4.4 >8 >8 8 SSE 2.9 >8 >8 9 S 4.8 >8 6.6 10SSW 4.7 >8 >8 11 SW 1.2 >8 >8 12WSW 3.6 4.3 4.3 13W 2.0 >8 >8 14WNW 2.6 >8 >8 15NW 2.7 4.7 >8 16NNW 2.1 2.1 2.1 F. Errata Data There was no errata data for 2019.

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 (POE) Mixed Analyte Performance Evaluation Program (MAPEP), were evaluated against the following pre-set acceptance criteria:

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

B. ERA Evaluation Criteria ERA's evaluation report provides an acceptance range for control and warning limits with associated flag values. ERA's acceptance limits are established per the USEPA, National Environmental Laboratory Accreditation Conference (NELAC), state-specific Performance Testing (PT) program requirements or ERA's SOP for the Generation of Performance Acceptance Limits, as applicable.

The acceptance limits are either determined by a regression equation specific to each analyte or a fixed percentage limit promulgated under the appropriate regulatory document.

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

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

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

to +/- 30% of the reference value

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

For the TBE laboratory, 119 out of 129 analyses performed met the specified acceptance criteria. Ten 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 April 2019 water Cs-134 result was evaluated as Not Acceptable. The reported value was 15.2 pCi/L (error 2.82 pCi/L) and the known result was 12.1 pCi/L (acceptance range of 8.39 - 14.4 pCi/L). With the error, the reported result overlaps ttie acceptable range. This sample was run as the workgroup duplicate on a different detector with a result of 10.7 pCi/L (within acceptable range).

(NCR 19-10)

2. The ERA April 2019 water Sr-89 result was evaluated as Not Acceptable. The reported value was 44.9 pCi/L and the known result was 33.3 pCi/L (acceptance range of 24.5 - 40.1 pCi/L). The sample was only counted for 15 minutes instead of 200 minutes. The sample was re-prepped in duplicate and counted for 200 minutes with results of 30.7 +/- 5.37 pCi/L and 33.0 +/- 8.71 pCi/L. This was the 1st "high" failure for Sr-89 in 5 years. (NCR 19-11)

3. The MAPEP February 2019 soil Sr-90 result was not submitted and therefore evaluated as Not Acceptable. The sample was run in duplicate, with *results of -1.32 +/- 4.09 Bq/kg (<6.87) and -1.030 +/- 3.55 Bq/kg (<5.97). The known result was a false positive test (no significant activity). TBE did not submit a result because it appeared that the results may not be accurate. TBE analyzed a substitute soil Sr-90 sample from another vendor, with a result within the acceptable range. (NCR 19-12)

4. The MAPEP February 2019 water Am-241 result was evaluated as Not Acceptable. The reported value was 0.764 +/- 0.00725 Bq/L with a known result of 0.582 Bq/L (acceptable range 0.407 - 0.757 Bq/L).

TBE's result falls within the upper acceptable range with the error. It appeared that a non-radiological interference was added and lead to an increased mass and higher result. (NCR 19-13)

5. The MAPEP February 2019 vegetation Sr-90 result was evaluated as Not Acceptable. The reported result was -0.1060 +/- 0.0328 Bq/kg and the known result was a false positive test (no significant activity).

TBE's result was correct in that there was no activity. MAPEP's evaluation was a "statistical failure" at 3 standard deviations.

(NCR 19-14)

6. The ERA October 2019 water Gross Alpha result was evaluated as Not Acceptable. TB E's reported result was 40.5 +/- 10.3 pCi/L and the known result was 27.6 pCi/L (ratio ofTBE to known result at 135%).

With the associated error, the result falls within the acceptable range (14.0 - 36.3 pCi/L). The sample was run as the workgroup duplicate on a different detector with a result of 30.8 +/- 9.17 pCi/L (within the acceptable range). This was the first failure for drinking water Gr-A since 2012. (NCR 19-23)

7. The ERA October 2019 water Sr-90 result was evaluated as Not Acceptable. TBE's reported result was 32.5 +/- 2.12 pCi/L and the known result was 26.5 pCi/L (ratio of TBE to known result at 123%).

With the associated error, the result falls within the acceptable range (19.2 - 30.9 pCi/L). The sample was run as the workgroup duplicate on a different detector with a result of 20.0 +/- 1.91 pCi/L (within the acceptable range). Both TBE results are within internal QC limits. A substitute "quick response" sample was analyzed with an acceptable result of 18.6 pCi/L (known range of 13.2 - 22.1 pCi/L). (NCR 19-24)

8. The MAPEP August 2019 soil Ni-63 result of 436 +/- 22.8 Bq/kg was evaluated as Not Acceptable. The known result was 629 Bq/kg (acceptable range 440 - 818 Sq/sample). With the associated error, the TBE result falls within the lower acceptance range. All associated QC was acceptable. No reason for failure could be found. This is the first failure for soil Ni-63 since 2012. (NCR 19-25).

9. The MAPEP August 2019 water Am-241 result was not reported and therefore evaluated as Not Acceptable. Initial review of the results showed a large peak where Am-241 should be (same as the February, 2019 sample results). It is believed that Th-228 was intentionally added as an interference. The sample was re-prepped and analyzed using a smaller sample aliquot. The unusual large peak (Th-228) was seen again and also this time a smaller peak (Am-241 ).

The result was 436 +/- 22.8 Bq/L (acceptable range 0.365 +/- 0.679 Bq/L). Th-228 is not a typical nuclide requested by clients, so there is no analytical purpose to take samples through an additional separation step. TBE will pursue using another vendor for Am-241 water cross-checks that more closely reflects actual customer samples. (NCR 19-26)

10. The Analytics September 2019 soil Cr-51 sample was evaluated as Not Acceptable. TBE's reported result of 0.765 +/- 0.135 pCi/g exceeded the upper acceptance range (140% of the known result of 0.547 pCi/g). The TBE result was within the acceptable range (0.63 -

0.90 pCi/g) with the associated error. The Cr-51 result is very close to TBE's normal detection limit. In order to get a reportable result, the sample must be counted for 15 hours1.736111e-4 days <br />0.00417 hours <br />2.480159e-5 weeks <br />5.7075e-6 months <br /> (1 Ox longer than client samples). There is no client or regulatory requirement for this nuclide and TBE will remove Cr-51 from the reported gamma nuclides going forward. (NCR 19-27)

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

V. References

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

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

3. CPS 2014 Annual Radioactive Effluent Release Report.

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

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

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

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

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

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

9. "Radioactivity in the Environment: Sources, Distribution and Surveillance," Ronald L. Kathren, 1984.

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

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

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

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

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

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

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

91, "Recommendations on Limits for Exposure to Ionizing Radiation,"

June 1987.

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

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

September 1987.

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

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

17. United States Nuclear Regulatory 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, 2019 NAME OF FACILITY: CLINTON POWER STATION DOCKET NUMBER: 50-461 LOCATION OF FACILITY: DEWITT COUNTY IL REPORTING PERIOD: 2019 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 (UN/TOF 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 <LLD NA 0 (PCI/LITER)

H-3 16 2000 <LLD <LLD 0 GAMMA 47 MN-54 15 <LLD <LLD 0 C0-58 15 <LLD <LLD 0 FE-59 30 <LLD <LLD 0 C0-60 15 <LLD <LLD 0 ZN-65 30 <LLD <LLD 0 NB-95 15 <LLD <LLD 0

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

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

H-3 4 2000 <LLD NA 0 1*131 (LOW LVL) 12 <LLD NA 0 GAMMA 12 MN-54 15 <LLD NA 0 C0-58 15 <LLD NA 0 FE-59 30 <LLD NA 0 C0-60 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, 2019 NAME OF FACILITY: CLINTON POWER STATION DOCKET NUMBER: 50-461 LOCATION OF FACILITY: DEWITT COUNTY IL REPORTING PERIOD: 2019 INDICATOR CONTROL LOCATION WITH HIGHEST ANNUAL MEAN (M)

MEDIUM OR REQUIRED LOCATIONS LOCATION NUMBER OF PATHWAY SAMPLED TYPES OF NUMBER OF LOWER LIMIT MEAN (M) MEAN (M) MEAN(M) STATION# NON ROUTINE (UNITOF ANALYSIS ANALYSIS OF DETECTION (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/LITER)

GAMMA 12 MN-54 15 <LLD NA 0 C0-58 15 <LLD NA 0 FE-59 30 <LLD NA 0 C0-60 15 <LLD NA 0 ZN-65 30 <LLD NA 0 NB-95 15 <LLD NA 0 l> ZR-95 30 <LLD NA 0 I

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 C0-58 130 <LLD <LLD 0 FE-59 260 <LLD <LLD 0 C0-60 130 <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, 2019 NAME OF FACILITY: CLINTON POWER STATION DOCKET NUMBER: 50-461 LOCATION OF FACILITY: DEWITT COUNTY IL REPORTING PERIOD: 2019 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 SEDIMENT GAMMA 4 (PCUKGDRY) MN-54 NA <LLD <LLD 0 C0-58 NA <LLD <LLD 0 FE-59 NA <LLD <LLD 0 C0-60 NA <LLD <LLD 0 ZN-65 NA <LLD <LLD 0 NB-95 NA <LLD <LLD 0 ZR-95 NA <LLD <LLD 0 CS-134 150 <LLD <LLD 0 CS-137 180 <LLD <LLD 0

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

CA) LA-140 NA <LLD <LLD 0 CE-144 NA <LLD <LLD 0 AIR PARTICULATE GR*B 519 10 16 16 16 CL-11 CONTROL 0 (E-3 PC/ICU.METER) (467/468) (51/51) (51/51) ILLINOIS POWER SUBSTATION 5-31 6-32 6-32 16 MILES S OF SITE GAMMA 40 C0-60 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, 2019 NAME OF FACILITY: CLINTON POWER STATION DOCKET NUMBER: 50-461 LOCATION OF FACILITY: DEWITT COUNTY IL REPORTING PERIOD: 2019 INDICATOR CONTROL LOCATION WITH HIGHEST ANNUAL MEAN (M)

MEDIUM OR REQUIRED LOCATIONS LOCATION NUMBER OF PATHWAY SAMPLED TYPES OF NUMBER OF LOWER LIMIT MEAN(M) MEAN (M) MEAN(M) STATION# NON ROUTINE (UNITOF ANALYSIS ANALYSIS OF DETECTION (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 (PCIIL/TER)

GAMMA 19 K-40 NA NA 1031 1031 CL-116 CONTROL 0 (19/19) (19/19) DEMENT DAIRY 614 - 1302 614-1302 14 MILES WSW OF SITE MN-54 NA NA <LLD 0 C0-58 NA NA <LLD 0 FE-59 NA NA <LLD 0 C0-60 NA NA <LLD 0

)> 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 48 (PCI/KG WET) MN-54 NA <LLD <LLD 0 C0-58 NA <LLD <LLD 0 FE-59 NA <LLD <LLD 0 C0-60 NA <LLD <LLD 0 ZN-65 NA <LLD <LLD 0 NB-95 NA <LLD <LLD 0 ZR-95 NA <LLD <LLD 0 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, 2019 NAME OF FACILITY: CLINTON POWER STATION DOCKET NUMBER: 50-461 LOCATION OF FACILITY: DEWITT COUNTY IL REPORTING PERIOD: 2019 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 GRASS GAMMA 52 (PCIIKG WET) MN-54 NA <LLD <LLD 0 C0-58 NA <LLD <LLD 0 FE-59 NA <LLD <LLD 0 C0-60 NA <LLD <LLD 0 ZN-65 NA <LLD <LLD 0 NB-95 NA <LLD <LLD 0 ZR-95 NA <LLD <LLD 0 1-131 60 <LLD <LLD 0 CS-134 60 <LLD <LLD 0 l> CS-137 80 <LLD <LLD 0 I

01 BA-140 NA <LLD <LLD 0 LA-140 NA <LLD <LLD 0 CE-144 NA <LLD <LLD 0 DIRECT RADIATION OSLD-QUARTERLY 216 NA 18.7 17.4 21.2 CL-65 INDICATOR 0 (MILU-ROENTGENIQTR.) (212/212) (4/4) (4/4) 13.5- 23.6 159- 18.6 19.9- 22.2 2.6 MILES ENE (M) The Mean Values are calculated using the positive values. (F) Fraction of detectable measurement are indicated in parentheses.

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

Intentionally left blank TABLE B-1: Radiological Environmental Monitoring Program - Sampling Locations, Distance and Direction Clinton Power Station, 2019 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. Well Water CL-7D Mascoutin Recreation Area (indicator) 2.3 miles ESE CL-12T DeWitt Pump House (indicator) 1.6 miles E CL-12R DeWitt Pump House (indicator) 1.6 miles E D. Milk - bi-weekly/ monthly CL-116 Dement Dairy (control) 14 miles WSW E. Air Particulates/ Air Iodine CL-1 Camp Quest 1.8 miles W CL-2 Clinton's Main Access Road 0.7 miles NNE CL-3 Clinton's Secondary Access Road 0.7 miles NE CL-4 Residence Near Recreation Area 0.8 miles SW CL-6 Clinton's Recreation Area 0.7milesWSW CL-7 Mascoutin Recreation Area 2.3 miles SE CL-8 DeWitt Cemetery 2.2 miles E CL-11 Illinois Power Substation (control) 16 miles S CL-15 Rt. 900N Residence 0.9 miles N CL-94 Old Clinton Road 0.6 miles E F. Fish CL-19 End of Discharge Flume (indicator) 3.4 miles E CL-105 Lake Shelbyville (control) 50 miles S G. Shoreline Sediment CL-7B Clinton Lake (indicator) 2.1 miles SE CL-105 Lake Shelbyville (control) 50 miles S H. Food Products CL-114 Residence SSE of Site (Control) 12.5 miles SSE CL-115 Site's Secondary Access Road 0.7 miles NE CL-117 Residence North of Site 0.9 miles N 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 8-1

TABLE B-1: Radiological Environmental Monitoring Program - Sampling Locations, Distance and Direction Clinton Power Station, 2019 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 4.5milesWNW 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 B-2

TABLE B-1: Radiological Environmental Monitoring Program - Sampling Locations, Distance and Direction Clinton Power Station, 2019 Location Location Description Distance & Direction From Site J. Environmental Dosimetry- DLR (cont.)

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 CL-11 16 miles S B-3

TABLE B-2: Radiological Environmental Monitoring Program - Summary of Sample Collection and Analytical Methods, Clinton Power Station, 2019 Sample Analysis Sampling Method Analytical Procedure Number Medium Surface Monthly composite from a TBE, TBE-2007 Gamma-Emitting Radioisotope Analysis Gamma Spectroscopy Water continuous water compositor Env. Inc., SPM-1 Sampling Procedure Manual TBE, TBE-2011 Tritium Analysis in Drinking Water by Surface Quarterly composite from a 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 Drinking Monthly composite from a Various Matrices Gross Beta Water continuous water compositor Env. Inc., SPM-1 Sampling Procedure Manual Drinking Monthly composite from a TBE, TBE-2007 Gamma-Emitting Radioisotope Analysis Gamma Spectroscopy Water continuous water compositor Env. Inc., SPM-1 Sampling Procedure Manual TBE, TBE-2011 Tritium Analysis in Drinking Water by Drinking Quarterly composite from a 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 Quarterly composite from a TBE, TBE-2007 Gamma-Emitting Radioisotope Analysis Well Water Gamma Spectroscopy continuous water compositor Env. Inc., SPM-1 Sampling Procedure Manual TBE, TBE-2011 Tritium Analysis in Drinking Water by Quarterly composite from a Liquid Scintillation Well Water Tritium continuous water compositor Env. Inc., SPM-1 Sampling Procedure Manual Semi-annual samples TBE-2007 Gamma-Emitting Radioisotope Analysis Fish Gamma Spectroscopy collected via electroshocking or other techniques Env. Inc., SPM-1 Sampling Procedure Manual TBE, TBE-2007 Gamma-Emitting Radioisotope Analysis Sediment Gamma Spectroscopy Semi-annual grab samples Env. Inc., SPM-1 Sampling Procedure Manual One-week composite of TBE, TBE-2008 Gross Alpha and/or Gross Beta Activity in Air continuous air sampling Various Matrices Gross Beta Particulates through glass fiber filter paper Env. Inc., SPM-1 Sampling Procedure Manual Air Quarterly composite of each TBE, TBE-2007 Gamma-Emitting Radioisotope Analysis Gamma Spectroscopy Particulates station Env. Inc., SPM-1 Sampling Procedure Manual One-week composite of TBE, TBE-2007 Gamma-Emitting Radioisotope Analysis Air Iodine Gamma Spectroscopy continuous air sampling through charcoal filter Env. Inc., SPM-1 Sampling Procedure Manual 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 8-4

TABLE B-2: Radiological Environmental Monitoring Program - Summary of Sample Collection and Analytical Methods, Clinton Power Station, 2019 Sample Analysis Sampling Method Analytical Procedure Number Medium Bi-weekly grab sample when TBE-2007 Gamma-Emitting Radioisotope Analysis Milk Gamma Spectroscopy cows are on pasture.

Monthly all other times Env. Inc., SPM-1 Sampling Procedure Manual TBE, TBE-2008 Gross Alpha and/or Gross Beta Activity in Food Monthly grab Various Matrices Gross Beta Products June through September Env. Inc., SPM-1 Sampling Procedure Manual Food Monthly grab TBE, TBE-2007 Gamma-Emitting Radioisotopes Analysis Gamma Spectroscopy Products June through September Env. Inc., SPM-1 Sampling Procedure Manual Biweekly TBE, TBE-2007 Gamma-Emitting Radioisotopes Analysis Grass Gamma Spectroscopy May through October Env. Inc., SPM-1 Sampling Procedure Manual Quarterly DLRs comprised Thermo-Luminescence DLR of two Al20,: C Landauer Landauer Incorporated Dosimetry Incorporated elements 8-5

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Figure B-2 Environmental Sampling Locations Between One and Two Miles of the Clinton Power Station, 2019 B-7

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Figure B-3 Environmental Sampling Locations between Two and Five Miles from the Clinton Power Station, 2019 B-8

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Mt Figure B-4 Environmental Sampling Locations Greater Than Five Miles of the Clinton Power Station, 2019 B-9

Intentionally left blank APPENDIXC DATA TABLES AND FIGURES

Intentionally left blank Table C-1.1 CONCENTRATIONS OF 1-131 IN SURFACE WATER SAMPLES COLLECTED IN THE VICINITY OF CLINTON POWER STATION, 2019 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION PERIOD CL-90 12/26/18 - 01/31/19 < 0.6 01/31/19 - 02/27/19 < 0.7 02/27/19 - 03/27/19 < 0.8 03/27/19 - 04/24/19 < 0.7 04/24/19 - 05/29/19 < 0.5 05/29/19 - 06/26/19 < 0.8 06/26/19 - 07/31/19 < 0.8 07/31/19 - 08/28/19 < 0.5 08/28/19 - 09/25/19 < 0.9 09/25/19 - 10/30/19 < 0.7 10/30/19 - 11/27/19 < 0.8 11/27/19 - 12/26/19 < 0.8 MEAN Table C-1.2 CONCENTRATIONS OF TRITIUM IN SURFACE WATER SAMPLES COLLECTED IN THE VICINITY OF CLINTON POWER STATION, 2019 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION PERIOD CL-13 CL-90 CL-91 CL-99 12/26/18 - 03/27/19 < 181 < 185 < 183 < 183 03/27/19 - 06/26/19 < 195 < 193 < 197 < 194 06/26/19 - 09/25/19 < 178 < 183 < 180 < 185 09/25/19 - 12/26/19 < 197 < 194 < 195 < 186 MEAN C-1

Table C-1.3 CONCENTRATIONS OF GAMMA EMITTERS IN SURFACE WATER SAMPLES COLLECTED IN THE VICINITY OF CLINTON POWER STATION, 2019 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION SITE PERIOD Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 Cs-134 Cs-137 Ba-140 La-140 Ce-144 CL-13 01/31/19 - 01/31/19 (1) < 6 < 6 < 10 < 8 < 10 < 5 < 8 < 5 < 6 < 29 < 8 < 34 02/27/19 - 02/27/19 < 6 < 6 < 11 <5 < 11 < 6 < 10 < 7 <5 < 27 < 7 < 49 03/27/19 - 03/27/19 < 8 < 8 < 15 <9 < 14 < 7 < 13 < 7 < 7 < 30 < 6 < 62 04/24/19 - 04/24/19 < 6 < 6 < 15 < 4 < 15 < 7 < 13 < 6 < 6" < 28 < 10 < 45 05/29/19 - 05/29/19 < 6 < 5 < 13 <4 < 9 < 7 < 10 < 7 < 7 < 27 < 8 < 47 06/26/19 - 06/26/19 < 7 < 6 < 11 <9 < 10 < 6 < 12 < 7 <6 < 24 < 9 < 41 07/31/19 - 07/31/19 < 6 < 7 < 15 <8 < 12 < 7 < 11 < 7 < 6 < 29 < 9 < 46 08/28/19 - 08/28/19 < 5 < 5 < 14 < 6 < 12 < 5 < 9 < 6 < 6 < 21 < 10 < 38 09/25/19 - 09/25/19 < 6 < 6 < 11 < 6 < 11 < 8 < 10 < 5 < 5 < 27 < 9 < 45 10/30/19 - 10/30/19 < 6 < 6 < 11 <9 < 8 < 6 < 12 < 6 < 6 < 27 < 10 < 37 11/27/19 - 11/27/19 < 5 < 6 < 14 <6 < 15 < 6 < 9 < 7 <5 < 31 < 8 < 44 12/26/19 - 12/26/19 < 6 < 6 < 12 < 7 < 13 < 5 < 11 < 6 < 6 < 27 < 11 < 35

(") MEAN I

N CL-90 12/26/18 - 01/31/19 < 6 < 5 < 9 <7 < 10 < 7 < 10 < 7 < 6 < 22 < 13 < 35 01/31/19 - 02/27/19 < 6 < 8 < 15 < 8 < 14 <7 < 13 < 7 < 8 < 34 < 8 < 61 02/27/19 - 03/27/19 < 8 < 9 < 14 <7 < 15 < 8 < 12 < 9 < 9 < 44 < 13 < 66 03/27/19 - 04/24/19 < 6 < 7 < 11 < 6 < 16 < 7 < 13 < 5 < 6 < 30 < 5 < 38 04/24/19 - 05/29/19 < 5 < 5 < 10 <4 < 12 <4 < 10 < 6 < 6 < 26 < 8 < 43 05/29/19 - 06/26/19 < 7 < 6 < 12 < 7 < 14 < 8 < 13 < 7 < 7 < 30 < 8 < 44 06/26/19 - 07/31/19 < 8 < 7 < 13 <7 < 12 < 7 < 9 < 6 < 7 < 30 < 12 < 39 07/31 /19 - 08/28/19 < 5 < 5 < 11 <4 < 9 < 5 < 8 < 5 < 6 < 23 < 5 < 35 08/28/19 - 09/25/19 < 5 < 6 < 12 <6 < 13 < 6 < 10 < 7 < 6 < 26 < 8 < 45 09/25/19 - 10/30/19 < 6 < 5 < 14 < 6 < 10 < 6 < 11 < 5 <7 < 25 < 7 < 43 10/30/19 - 11/27/19 < 6 < 6 < 13 < 8 < 14 <7 < 12 < 6 <7 < 33 < 10 < 48 11/27/19 - 12/26/19 < 5 < 6 < 10 < 5 < 11 <5 < 9 < 6 < 5 < 20 < 7 < 33 MEAN (1) SEE PROGRAM EXCEPTIONS SECTION FOR EXPLANATION CL-91 12/26/18 - 01/31/19 < 7 < 7 < 12 <7 < 15 < 7 < 11 < 6 < 5 < 29 < 10 < 39

Table C-1.3 CONCENTRATIONS OF GAMMA EMITTERS IN SURFACE WATER SAMPLES COLLECTED IN THE VICINITY OF CLINTON POWER STATION, 2019 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 01/31/19 - 02/27/19 < 6 < 8 < 11 < 5 < 14 < 7 < 11 < 7 <7 < 28 < 8 < 48 02/27/19 - 03/27/19 < 3 < 7 < 15 < 7 < 12 < 8 < 10 < 7 < 8 < 29 < 11 < 39 03/27/19 - 04/24/19 < 7 < 7 < 17 < 7 < 14 < 9 < 12 < 8 < 8 < 37 < 13 < 52 04/24/19 - 05/29/19 < 5 < 7 < 15 < 4 < 10 < 7 < 13 < 5 < 6 < 28 < 9 < 45 05/29/19 - 06/26/1 9 < 6 < 7 < 13 < 5 < 13 < 7 < 11 < 7 < 6 < 26 < 12 < 48 06/26/19 - 07/31/19 < 5 < 6 < 13 < 8 < 13 < 6 < 10 < 6 < 6 < 33 < 10 < 42 07/31/19 - 08/28/19 < 4 < 4 < 13 < 7 < 10 < 6 < 11 < 7 < 5 < 24 < 8 < 35 08/28/19 - 09/25/19 < 5 < 4 < 11 < 8 < 13 < 6 < 11 < 5 < 5 < 17 < 9 < 35 09/25/19 - 10/30/19 < 7 < 4 < 13 < 7 < 13 < 6 < 7 < 6 < 6 < 22 < 14 < 43 10/30/19 - 11/27/19 < 7 < 9 < 12 < 8 < 12 < 7 < 9 < 9 < 7 < 33 < 13 < 38 11/27/19 - 12/26/19 < 6 < 6 < 11 < 6 < 13 < 7 < 10 < 6 < 6 < 20 < 9 < 35 MEAN

()

I c.>

CL-99 12/26/18 - 01/31/19 < 5 < 6 < 12 < 5 < 13 < 6 < 6 < 6 < 5 < 27 < 7 < 43 01/31/19 - 02/27/19 < 5 < 7 < 10 < 7 < 14 < 7 < 13 < 6 <7 < 25 < 9 < 40 02/27/19 - 03/27/19 < 5 < 5 < 15 < 6 < 15 < 8 < 11 < 8 < 5 < 34 < 8 < 42 03/27/19 - 04/24/19 < 5 < 5 < 12 < 5 < 11 < 6 < 9 < 5 < 5 < 26 < 7 < 35 04/24/19 - 05/29/19 < 5 < 5 < 11 < 6 < 9 < 6 < 8 < 6 < 5 < 23 < 11 < 42 05/29/19 - 06/26/19 < 6 < 7 < 19 <4 < 14 < 8 < 11 < 6 <6 < 27 < 6 < 34 06/26/19 - 07/31 /19 < 7 < 6 < 15 < 6 < 10 < 6 < 9 < 7 <7 < 29 < 10 < 51 07/31/19 - 08/28/19 < 5 < 5 < 10 < 6 < 11 < 5 < 9 < 5 < 5 < 22 < 7 < 39 08/28/19 - 09/25/19 < 7 < 7 < 12 < 7 < 13 < 8 < 11 < 7 < 7 < 29 < 11 < 52 09/25/19 - 10/30/19 < 5 < 6 < 10 < 6 < 10 < 5 < 9 < 5 < 6 < 23 < 9 < 41 10/30/19 - 11/27/19 < 6 < 6 < 12 <7 < 9 < 6 < 11 < 8 <5 < 26 < 10 < 46 11 /27/19 - 12/26/19 < 5 <4 < 11 <4 < 11 < 6 < 8 < 5 <5 < 24 < 7 < 37 MEAN

Table C-11.1 CONCENTRATIONS OF GROSS BETA IN DRINKING WATER SAMPLES COLLECTED IN THE VICINITY OF CLINTON POWER STATION, 2019 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION PERIOD CL-14 12/26/18 - 01/31/19 < 1.7 01/31/19 - 02/27/19 < 1.6 02/27/19 - 03/27/19 < 1.6 03/27/19 - 04/24/19 < 1.5 04/24/19 - 05/29/19 < 2.0 05/29/19 - 06/26/19 < 1.6 06/26/19 - 07/31/19 < 1.8 07/31/19 - 08/28/19 < 1.6 08/28/19 - 09/25/19 < 1.6 09/25/19 - 10/30/19 < 1.7 10/30/19 - 11/27/19 < 1.6 11/27/19 - 12/26/19 < 1.6 MEAN Table C-11.2 CONCENTRATIONS OF TRITIUM IN DRINKING WATER SAMPLES COLLECTED IN THE VICINITY OF CLINTON POWER STATION, 2019 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION PERIOD CL-14 12/26/18 - 03/27/19 < 187 03/27/19 - 06/26/19 < 198 06/26/19 - 09/25/19 < 198 09/25/19 - 12/26/19 < 188 MEAN Table C-11.3 CONCENTRATIONS OF 1-131 IN DRINKING WATER SAMPLES COLLECTED IN THE VICINITY OF CLINTON POWER STATION, 2019 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION PERIOD CL-14 12/26/18 - 01/31/19 < 0.4 01/31/19 - 02/27/19 < 0.8 02/27/19 - 03/27/19 < 0.9 03/27/19 - 04/24/19 < 0.8 04/24/19 - 05/29/19 < 0.4 05/29/19 - 06/26/19 < 0.7 06/26/19 - 07/31/19 < 0.8 07/31/19 - 08/28/19 < 0.4 08/28/19 - 09/25/19 < 0.7 09/25/19 - 10/30/19 < 0.7 10/30/19 - 11/27/19 < 0.6 11/27/19 - 12/26/19 < 0.8 MEAN C-4

Table C-11.4 CONCENTRATIONS OF GAMMA EMITTERS IN DRINKING WATER SAMPLES COLLECTED IN THE VICINITY OF CLINTON POWER STATION, 2019 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 12/26/18 - 01/31/19 <5 < 5 < 13 < 8 < 9 < 5 < 9 < 6 < 6 < 27 < 11 < 35 01/31/19 - 02/27/19 <5 < 7 < 10 < 8 <7 < 6 < 10 < 8 < 6 < 35 < 11 < 41 02/27/19 - 03/27/19 < 6 < 7 < 14 <7 < 13 <4 < 10 < 6 < 7 < 24 < 12 < 46 03/27/19 - 04/24/19 <4 <7 < 8 < 6 < 15 < 8 < 13 < 6 < 7 < 27 < 9 < 43 04/24/19 - 05/29/19 < 5 <4 < 12 <4 < 10 < 5 < 9 < 6 < 6 < 25 < 8 < 35 05/29/19 - 06/26/19 <5 < 5 < 11 <5 < 12 < 6 < 10 < 5 < 5 < 28 < 8 < 43 06/26/19 - 07/31/19 < 5 < 7 < 13 < 10 < 16 < 7 < 12 < 8 < 6 < 39 < 12 < 52 07/31/19 - 08/28/19 < 7 < 7 < 14 < 8 < 15 <7 < 12 < 7 < 7 < 30 < 10 < 51 08/28/19 - 09/25/19 < 5 < 4 < 10 < 5 < 10 <4 < 8 < 5 < 5 < 20 < 7 < 35 09/25/19 - 10/30/19 <5 <5 < 14 <7 < 13 <5 < 9 < 6 < 7 < 24 < 8 < 39 10/30/19 - 11/27/19 < 8 <7 < 16 <8 < 13 < 6 < 11 < 9 < 9 < 29 < 10 < 46 11/27/19 - 12/26/19 < 5 < 6 < 11 <5 < 13 < 5 < 8 < 7 < 5 < 25 < 5 < 35 C) MEAN I

U'I

Table C-111.1 CONCENTRATIONS OF TRITIUM IN WELL WATER SAMPLES COLLECTED IN THE VICINITY OF CLINTON POWER STATION, 2019 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION PERIOD CL-07D CL-12R CL-12T 03/27/19 - 03/27/19 < 199 < 199 < 197 06/26/19 - 06/26/19 < 194 < 193 < 198 09/25/19 - 09/25/19 < 188 < 190 < 188 12/26/19 - 12/26/19 < 180 < 180 < 183 MEAN C-6

Table C-111.2 CONCENTRATIONS OF GAMMA EMITTERS IN WELL WATER SAMPLES COLLECTED IN THE VICINITY OF CLINTON POWER STATION, 2019 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 03/27/19 < 6 < 7 < 15 < 7 < 7 < 7 < 11 < 7 < 8 < 21 < 11 < 45 06/26/19 <4 < 5 < 7 < 5 < 9 < 5 < 7 < 6 < 5 < 25 < 9 < 41 09/25/19 < 6 < 6 < 12 < 7 < 12 < 8 < 9 < 7 < 6 < 29 < 10 < 46 12/26/19 < 5 < 5 < 11 < 5 < 10 < 5 < 8 < 5 < 6 < 22 < 7 < 33 MEAN CL-12R 03/27/19 < 5 <6 < 15 < 6 < 5 < 6 < 10 < 8 < 7 < 24 < 15 < 45 06/26/19 <4 <4 < 12 < 6 < 9 < 6 < 7 < 5 < 6 < 28 < 6 < 37 09/25/19 < 6 < 6 < 11 < 5 < 15 < 7 < 9 < 6 < 6 < 25 < 7 < 41 12/26/19 < 5 < 5 < 6 < 7 < 9 < 6 < 10 < 6 < 5 < 25 < 8 < 35 MEAN C)

I

-...I CL-12T 03/27/19 < 8 < 6 < 11 < 7 < 15 < 6 < 14 < 6 <6 < 30 < 13 < 40 06/26/19 < 5 < 6 < 13 < 6 < 11 < 6 < 11 < 7 < 6 < 22 < 7 < 37 09/25/19 < 5 < 5 < 11 < 8 < 9 <4 < 7 < 6 < 5 < 22 < 7 < 34 12/26/19 < 5 <4 < 11 < 6 < 14 < 4 < 12 < 6 <5 < 24 < 9 < 37 MEAN

Table C-IV.1 CONCENTRATIONS OF GAMMA EMITTERS IN FISH SAMPLES COLLECTED IN THE VICINITY OF CLINTON POWER STATION, 2019 RES ULTS IN UNITS OF PCI/KG WET+/- 2 SIGMA COLLECTION SITE PERIOD Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 Cs-134 Cs-137 Ba-140 La-140 Ce-144 CL-19 Largemouth Bass 04/23/19 < 78 < 78 < 120 < 70 < 114 < 67 < 108 < 70 < 75 < 329 < 114 < 402 Channel Catfish 04/23/19 < 62 < 49 < 103 < 59 < 127 < 56 < 100 < 47 < 42 < 275 < 82 < 343 Bluegill 04/23/19 < 79 < 69 < 154 < 105 < 147 < 69 < 120 < 83 < 71 < 265 < 127 < 355 Carp 04/23/19 < 61 < 58 < 130 < 96 < 117 < 49 < 102 < 52 < 69 < 226 < 72 < 351 Largemouth Bass 09/30/19 < 72 < 60 < 204 < 60 < 110 < 62 < 115 < 62 < 71 < 318 < 52 < 256 Channel Catfish 09/30/19 < 78 < 77 < 150 < 56 < 136 < 69 < 125 < 63 < 79 < 389 < 80 < 359 Bluegill 09/30/19 < 66 < 94 < 141 < 83 < 187 < 84 < 140 < 98 < 78 < 384 < 83 < 391 Carp 09/30/19 < 50 < 68 < 115 < 74 < 135 < 66 < 106 < 61 < 61 < 274 < 85 < 307 MEAN CL-105 Largemouth Bass 04/23/19 < 53 < 55 < 108 < 52 < 130 < 52 < 84 < 49 < 62 < 209 < 77 < 270 Crappie 04/23/19 < 74 < 63 < 121 < 80 < 144 < 62 < 119 < 64 < 64 < 333 < 95 < 391

(") Bluegill 04/23/19 < 57 < 41 < 107 < 51 < 91 < 64 < 86 < 51 < 43 < 300 < 91 < 292 I

ex, Carp 04/23/19 < 82 < 82 < 166 < 76 < 145 < 70 < 98 < 71 < 78 < 390 < 130 < 398 Largemouth Bass 09/30/19 < 65 < 62 < 103 < 61 < 137 < 33 < 121 < 75 < 57 < 273 < 116 < 258 White Crappie/White Bass 09/30119 < 52 < 56 < 130 < 71 < 134 < 57 < 99 < 70 < 53 < 269 < 67 < 301 Bluegill 09/30/19 < 75 < 68 < 160 < 74 < 203 < 88 < 107 < 63 < 78 < 387 < 110 < 313 Carp 09/30/19 < 72 < 61 < 148 < 73 < 121 < 68 < 100 < 72 < 51 < 307 < 77 < 280 MEAN

Table C-V.1 CONCENTRATIONS OF GAMMA EMITTERS IN SEDIMENT SAMPLES COLLECTED IN THE VICINITY OF CLINTON POWER STATION, 2019 RESULTS IN UNITS OF PCI/KG DRY+ 2 SIGMA COLLECTION SITE PERIOD Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 Cs-134 Cs-137 Ba-140 La-140 Ce-144 CL-078 04/23/19 < 59 < 40 < 108 < 56 < 98 < 49 < 75 < 51 < 43 < 205 < 63 < 276 09/30/19 < 41 < 39 < 98 < 46 < 98 < 41 < 63 < 43 < 37 < 201 < 70 < 185 MEAN CL-105 04/23/19 < 52 < 32 < 96 < 50 < 82 < 46 < 70 < 52 < 44 < 167 < 47 < 202 09/30/19 < 31 < 32 < 83 < 46 < 86 < 37 < 56 < 40 < 38 < 185 < 83 < 175 MEAN 0I c.c

---

_ __J

Table C-Vl.1 CONCENTRATIONS OF GROSS BETA IN AIR PARTICULATE SAMPLES COLLECTED IN THE VICINITY OF CLINTON POWER STATION, 2019 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 01/02/19 - 01/09/19 23 +/- 4 24 +/- 5 24 +/- 4 23 +/- 5 22 +/- 4 25 +/- 5 01/09/19 - 01/16/19 16 +/- 4 16 +/- 4 13 +/- 3 18 +/- 4 17 +/- 4 12 +/- 3 01/16/19 - 01/23/19 12 +/- 4 13 +/- 4 13 +/- 4 12 +/- 4 11 +/- 4 9 +/- 4 01/23/19 - 01/31/19 20 +/- 4 21 +/- 4 25 +/- 4 21 +/- 4 23 +/- 4 20 +/- 4 01/31/19 - 02/06/19 17 +/- 4 19 +/- 5 18 +/- 5 17 +/- 4 14 +/- 4 20 +/- 5 02/06/19 - 02/13/19 12 +/- 4 13 +/- 4 11 +/- 4 10 +/- 4 10 +/- 4 12 +/- 4 02/13/19 - 02/20/19 20 +/- 4 20 +/- 4 22 +/- 4 25 +/- 5 23 +/- 4 22 +/- 5 02/20/19 - 02/27/19 27 +/- 5 29 +/- 5 29 +/- 5 28 +/- 5 29 +/- 5 25 +/- 5 02/27/19 - 03/06/19 24 +/- 5 26 +/- 5 20 +/- 4 21 +/- 4 23 +/- 4 25 +/- 5 03/06/19 - 03/13/19 19 +/- 4 18 +/- 4 18 +/- 4 17 +/- 4 15 +/- 4 16 +/- 4 03/13/19 - 03/20/19 15 +/- 4 14 +/- 4 13 +/- 4 13 +/- 4 14 +/- 4 13 +/- 4 03/20/19 - 03/27/19 12 +/- 4 8 +/- 3 9 +/- 3 8+/-3 10 +/- 3 8 +/- 3 03/27/19 - 04/03/19 16 +/- 4 14 +/- 4 18 +/- 4 21 +/- 5 16 +/- 4 18 +/- 4 04/03/19 - 04/10/19 12 +/- 3 14 +/- 4 14 +/- 4 13 +/- 3 15 +/- 4 14 +/- 4 04/10/19 - 04/17/19 8+/-4 8 +/- 4 7+/-4 7 +/- 4 9+/-4 6+/-3 04/17/19 - 04/24/19 13 +/- 4 11 +/- 4 11 +/- 4 12 +/- 4 13 +/- 4 12 +/- 4 04/24/19 - 05/01/19 11 +/- 3 11 +/- 3 13 +/- 4 11 +/- 3 12 +/- 4 12 +/- 3 05/01/19 - 05/08/19 11 +/- 3 7 +/- 3 12 +/- 3 10 +/- 3 11 +/- 4 8 +/- 3 05/08/19 - 05/15/19 15 +/- 4 12 +/- 4 10 +/- 4 14 +/- 4 11 +/- 4 17 +/- 4 05/15/19 - 05/22/19 13 +/- 4 15 +/- 4 16 +/- 4 14 +/- 4 14 +/- 4 14 +/- 4 05/22/19 - 05/29/19 11 +/- 4 13 +/- 4 11 +/- 4 9+/-3 12 +/- 4 11 +/- 4 05/29/19 - 06/05/19 9+/-4 13 +/- 4 9+/-4 12 +/- 4 10 +/- 4 9+/-4 06/05/19 - 06/12/19 17 +/- 4 19 +/- 4 15 +/- 4 18 +/- 4 15 +/- 4 14 +/- 4 06/12/19 - 06/19/19 9+/-3 12 +/- 4 11 +/- 3 10 +/- 3 13 +/- 4 10 +/- 3 06/19/19 - 06/26/19 15 +/- 4 11 +/- 3 12 +/- 4 14 +/- 4 14 +/- 4 17 +/- 4 06/26/19 - 07/03/19 20 +/- 4 19 +/- 4 18 +/- 4 21 +/- 4 18 +/- 4 17 +/- 4 07/03/19 - 07/10/19 11 +/- 4 14 +/- 4 11 +/- 4 10 +/- 4 10 +/- 4 12 +/- 4 07/10/19 - 07/17/19 15 +/- 4 15 +/- 4 10 +/- 4 14 +/- 4 13 +/- 4 12 +/- 4 07/17/19 - 07/24/19 9+/- 4 8 +/- 4 10 +/- 4 9+/-4 5+/- 3 6 +/- 3 07/24/19 - 07/31/19 18 +/- 5 15 +/- 5 15 +/- 4 18 +/- 4 14 +/- 4 15 +/- 4 07/31/19 - 08/07/19 23 +/- 5 23 +/- 5 19 +/- 4 19 +/- 5 17 +/- 4 18 +/- 4 08/07/19 - 08/14/19 9 +/- 3 13 +/- 4 10 +/- 4 13 +/- 4 8 +/- 3 12 +/- 4 08/14/19 - 08/21/19 17 +/- 5 18 +/- 5 16 +/- 5 13 +/- 4 11 +/- 4 11 +/- 4 08/21/19 - 08/28/19 14 +/- 4 14 +/- 4 11 +/- 4 16 +/- 4 14 +/- 4 12 +/- 4 08/28/19 - 09/04/19 19 +/- 4 20 +/- 4 20 +/- 4 19 +/- 4 21 +/- 4 20 +/- 4 09/04/19 - 09/11/19 12 +/- 4 15 +/- 4 17 +/- 4 14 +/- 4 8 +/- 3 12 +/- 4 09/11/19 - 09/18/19 24 +/- 5 24 +/- 5 20 +/- 4 27 +/- 5 23 +/- 5 28 +/- 5 09/18/19 - 09/25/19 24 +/- 5 25 +/- 5 23 +/- 5 21 +/- 5 23 +/- 5 23 +/- 5 09/25/19 - 10/02/19 15 +/- 4 15 +/- 4 17 +/- 4 18 +/- 4 11 +/- 4 14 +/- 4 10/02/19 - 10/09/19 15 +/- 4 11 +/- 3 12 +/- 3 14 +/- 4 13 +/- 4 10 +/- 3 10/09/19 - 10/16/19 20 +/- 4 21 +/- 5 19 +/- 4 14 +/- 4 15 +/- 4 19 +/- 4 10/16/19 - 10/23/19 16 +/- 4 14 +/- 4 14 +/- 4 12 +/- 4 14 +/- 4 15 +/- 4 10/23/19 - 10/30/19 11 +/- 5 10 +/- 5 9 +/- 4 10 +/- 4 < 6 10 +/- 5 10/30/19 - 11/06/19 11 +/- 4 8 +/- 3 12 +/- 4 9+/-4 8+/-4 9 +/- 4 11/06/19 - 11/13/19 15 +/- 4 17 +/- 4 15 +/- 4 14 +/- 4 11 +/- 4 19 +/- 4 11/13/19 - 11/20/19 20 +/- 4 27 +/- 5 22 +/- 4 31 +/- 5 20 +/- 4 23 +/- 5 11/20/19 - 11/27/19 16 +/- 4 17 +/- 4 20 +/- 4 19 +/- 4 16 +/- 4 19 +/- 4 11/27/19 - 12/04/19 7 +/- 3 5 +/- 3 7+/-3 11 +/- 4 8+/-3 10 +/- 4 12/04/19 - 12/11/19 18 +/- 4 24 +/- 5 15 +/- 4 18 +/- 4 19 +/- 5 18 +/- 5 12/11/19 - 12/18/19 25 +/- 4 31 +/- 5 23 +/- 4 27 +/- 5 24 +/- 4 25 +/- 4 12/18/19 - 12/26/19 21 +/- 4 22 +/- 4 28 +/- 5 26 +/- 4 24 +/- 4 25 +/- 4 12/26/19 - 01/01/20 18 +/- 5 25 +/- 5 20 +/- 5 21 +/- 5 19 +/- 5 20 +/- 5 MEAN+/- 2 STD DEV 16 +/- 10 16 +/- 12 15 +/- 11 16 +/- 12 15 +/- 11 15 +/- 11 THE MEAN AND 1WO STANDARD DEVIATION ARE CALCULATED USING THE POSITIVE VALUES C-10

Table C-Vl.1 CONCENTRATIONS OF GROSS BETA IN AIR PARTICULATE SAMPLES COLLECTED IN THE VICINITY OF CLINTON POWER STATION, 2019 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 01102119 - 01109119 25 +/- 5 25 +/- 5 24 +/- 5 26 +/- 5 01109119 - 01116119 17 +/- 4 12 +/- 3 15 +/- 4 15 +/- 4 01116119 - 01123119 12 +/- 4 13 +/- 4 12 +/- 4 11 +/- 4 01123119 - 01131119 24 +/- 4 19 +/- 4 20 +/- 4 22 +/- 4 01131119 - 02/06119 21 +/- 5 18 +/- 4 21 +/- 5 15 +/- 4 02106119 - 02113119 11 +/- 4 9 +/- 4 12 +/- 4 11 +/- 4 02113119 - 02120119 20 +/- 4 19 +/- 4 20 +/- 4 23 +/- 4 02120119 - 02127119 22 +/- 4 26 +/- 5 29 +/- 5 28 +/- 5 02127119 - 03106119 21 +/- 4 23 +/- 5 22 +/- 4 19 +/- 4 03106119 - 03113119 22 +/- 4 16 +/- 4 17 +/- 4 19 +/- 4 03113119 - 03120119 11 +/- 3 12 +/- 3 12 +/- 4 15 +/- 4 03120119 - 03127119 8+/-3 10 +/- 3 9+/-3 11 +/- 3 03127119 - 04103119 13 +/- 4 15 +/- 4 15 +/- 4 12 +/- 4 04103119 - 04110119 13 +/- 4 14 +/- 4 14 +/- 4 16 +/- 4 04110119 - 04117119 8+/-4 7 +/- 4 10 +/- 4 9 +/-4 04117119 - 04124119 14 +/- 4 11 +/- 4 10 +/- 3 13 +/- 4 04124119 - 05101119 15 +/- 4 13 +/-4 10 +/- 3 13 +/- 4 05101119 - 05108119 8 +/- 3 11 +/- 3 10 +/- 3 10 +/- 3 05108119 - 05115119 11 +/- 4 15 +/-4 14 +/- 4 12 +/- 4 05/15119 - 05122119 16 +/- 4 15 +/-4 12 +/- 4 17 +/- 4 05122119 - 05129119 12 +/- 4 11 +/-4 11 +/- 4 10 +/- 4 05129119 - 06105119 10 +/- 4 11 +/-4 9 +/- 4 12 +/- 4 06105119 - 06112119 16 +/- 4 17 +/-4 18 +/- 4 17 +/- 4 06112119 - 06119119 12 +/- 4 13 +/-4 13 +/- 4 12 +/- 4 06119119 - 06126119 13 +/- 4 13 +/-4 15 +/- 4 17 +/- 4 06126119 - 07103119 19 +/- 4 17 +/- 4 19 +/- 4 16 +/- 4 07103119 - 07110119 11 +/- 4 9 +/-3 11 +/- 4 13 +/- 4 07/10119 - 07117119 17 +/- 4 14 +/-4 13 +/- 4 13 +/- 4 07117119 - 07124119 8+/-4 10 +/- 4 8+/- 4 11 +/- 4 07124119 - 07131119 14 +/- 4 17 +/- 4 14 +/- 4 14 +/- 4 07131119 - 08107119 20 +/- 4 17 +/- 4 17 +/- 4 22 +/- 5 08107119 - 08114119 13 +/- 4 12 +/- 4 9+/-4 10 +/- 4 08114119 - 08121119 13 +/- 4 15 +/- 5 14 +/- 4 18 +/- 5 08121119 - 08128119 14 +/- 4 15 +/- 4 12 +/- 4 16 +/- 4 08128119 - 09104119 24 +/- 5 19 +/- 4 18 +/- 4 21 +/- 4 09104119 - 09111119 19 +/- 4 15 +/- 4 15 +/- 4 19 +/- 4 09111119 - 09118119 26 +/- 5 19 +/-4 23 +/- 5 25 +/- 5 09118119 - 09125119 21 +/- 5 21 +/- 5 23 +/- 5 26 +/- 5 09125119 - 10102119 15 +/- 4 15 +/-4 17 +/- 4 24 +/- 5 10102119 - 10109119 9+/-3 13 +/-4 12 +/- 4 15 +/- 4 10109119 - 10116119 15 +/- 4 17 +/-4 12 +/- 4 21 +/- 5 10116119 - 10123119 16 +/- 4 14 +/-4 14 +/- 4 18 +/- 4 10123119 - 10130119 13 +/- 5 9 +/-4 10 +/- 4 11 +/- 5 10130119 - 11106119 9+/-4 13 +/-4 11 +/- 4 11 +/- 4 11106119 - 11113119 14 +/- 4 14 +/-4 15 +/- 4 18 +/- 4 11113119 - 11120119 24+/- 5 22 +/-4 19 +/- 4 (1) 11120119 - 11127119 18 +/- 4 14 +/-3 17 +/- 4 17 +/- 4 11127119 - 12104119 7 +/- 3 7 +/- 3 7 +/- 3 6 +/- 3 12104119 - 12111119 19 +/- 5 16 +/- 4 22 +/- 5 17 +/- 4 12111119 - 12118119 25 +/- 5 25 +/- 4 27 +/- 5 32 +/- 5 12118119 - 12126119 23 +/- 4 20 +/- 4 24 +/- 4 23 +/- 4 12126119 - 01101120 15 +/- 5 20 +/- 5 22 +/- 5 17 +/- 5 MEAN+/- 2 STD DEV 16 +/- 10 15 +/- 9 15 +/- 10 16 +/- 11 THE MEAN AND 1WO STANDARD DEVIATION ARE CALCULATED USING THE POSITIVE VALUES (1) SEE PROGRAM EXCEPTIONS SECTION FOR EXPLANATION C-11

Table C-Vl.2 MONTHLY AND YEARLY MEAN VALUES OF GROSS BETA CONCENTRATIONS IN AIR PARTICULATE SAMPLES COLLECTED IN THE VICINITY OF CLINTON POWER STATION, 2019 RESULTS IN UNITS OF E-3 PCI/CU METER+/- 2 SIGMA GROUP I - ON-SITE LOCATIONS GROUP II - INTERMEDIATE DISTANCE LOCATIONS GROUP Ill - CONTROL LOCATIONS COLLECTION MIN MAX MEAN COLLECTION MIN MAX MEAN COLLECTION MIN MAX MEAN PERIOD +/-2SD PERIOD +/-2SD PERIOD +/-2SD 01/02/19 - 01/31/19 9 25 18 +/- 10 01/02/19 - 01/31/19 12 25 18 +/- 11 01/02/19 - 01/31/19 11 26 19 +/- 14 01/31/19 - 02/27/19 10 29 20 +/- 13 01/31/19 - 02/27/19 9 29 19 +/- 12 01/31/19 - 02/27/19 11 28 19 +/- 15 02/27/19 - 04/03/19 8 26 16 +/- 10 02/27/19 - 04/03/19 8 23 15 +/- 10 02/27/19 - 04/03/19 11 19 15 +/- 7 04/03/19 - 05/01/19 6 15 11 +/- 5 04/03/19 - 05/01/19 7 15 11 +/- 5 04/03/19 - 05/01/19 9 16 13 +/- 6 05/01/19 - 05/29/19 7 17 12 +/- 5 05/01/19 - 05/29/19 8 16 12 +/- 4 05/01/19 - 05/29/19 10 17 12 +/- 7 05/29/19 - 07/03/19 9 21 14 +/- 7 05/29/19 - 07/03/19 9 19 14 +/- 7 05/29/19 - 07/03/19 12 17 15 +/- 5 07/03/19. - 07/31/19 5 18 12 +/- 7 07/03/19 - 07/31/19 8 17 12 +/- 6 07/03/19 - 07/31/19 11 14 13 +/- 3 07/31/19 - 09/04/19 8 23 16 +/- 8 07/31/19 - 09/04/19 9 24 15 +/- 8 07/31/19 - 09/04/19 10 22 18 +/- 10 09/04/19 - 10/02/19 8 28 19 +/- 11 09/04/19 - 10/02/19 15 26 19 +/- 7 09/04/19 - 10/02/19 19 26 23 +/- 7 10/02/19 - 10/30/19 9 21 14 +/- 7 10/02/19 - 10/30/19 9 17 13 +/- 5 10/02/19 - 10/30/19 11 21 16 +/- 8 10/30/19 - 12/04/19 5 31 15 +/- 13 10/30/19 - 12/04/19 7 24 14 +/- 11 10/30/19 - 12/04/19 6 18 13 +/- 11

(")

I

...i,.

12/04/19 - 01/01/20 15 31 22 +/- 8 12/04/19 - 01/01/20 15 27 22 +/- 7 12/04/19 - 01/01/20 17 32 22 +/- 14 I'll 01/02/19 - 01/01/20 5 31 16 +/- 11 01/02/19 - 01/01/20 7 29 15 +/- 10 01/02/19 - 01/01/20 6 32 16 +/- 11

Table C-Vl.3 CONCENTRATIONS OF GAMMA EMITTERS IN AIR PARTICULATE SAMPLES COLLECTED IN THE VICINITY OF CLINTON POWER STATION, 2019 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 01/02/19 - 04/03/19 < 3 < 3 < 5 < 3 < 26 < 3 < 3 < 3 < 11 04/03/19 - 07/03/19 < 2 < 3 < 4 < 2 < 17 < 1 <2 < 3 < 10 07/03/19 - 10/02/19 < 2 < 3 < 4 < 2 < 23 < 3 < 3 < 3 < 11 10/02/19 - 01/01/20 <4 < 3 < 7 < 3 < 27 <4 < 3 < 4 < 13 MEAN CL-2 01/02/19 - 04/03/19 < 3 < 2 <4 < 2 < 17 <2 < 2 < 2 < 8 04/03/19 - 07/03/19 <4 <2 <4 < 3 < 11 < 2 < 2 <4 < 11 07/03/19 - 10/02/19 < 3 <2 < 3 < 2 < 16 < 2 < 2 < 2 < 6 10/02/19 - 01/01/20 < 2 < 2 < 3 < 2 < 14 < 2 < 1 < 2 < 7 MEAN

....0ell I CL-3 01/02/19 04/03/19 04/03/19 07/03/19

< 3

<2

< 2

< 3

< 5

< 5 3

3 24 16 3

3 3

2

<3

<4 11 11 07/03/19 - 10/02/19 <2 < 2 < 3 < 2 < 15 < 2 < 2 < 2 < 8 10/02/19 - 01/01/20 < 2 <2 <4 < 3 < 21 < 2 < 2 < 3 < 9 MEAN CL-4 01/02/19 - 04/03/19 < 1 < 3 <3 < 2 < 17 < 3 <2 <2 < 8 04/03/19 - 07/03/19 < 2 < 3 <6 < 3 < 22 < 3 < 2 <4 < 11 07/03/19 - 10/02/19 <2 < 2 < 3 < 2 < 12 < 2 < 2 < 2 < 7 10/02/19 - 01/01/20 <2 < 2 <4 < 3 < 16 < 2 < 3 < 3 < 11 MEAN CL-6 01/02/19 - 04/03/19 < 2 < 2 <4 < 2 < 16 < 2 <2 <2 < 7 04/03/19 - 07/03/19 <4 <4 < 6 < 3 < 28 < 3 < 3 <4 < 12 07/03/19 - 10/02/19 < 3 <3 <5 < 3 < 22 < 2 <3 <3 < 9 10/02/19 - 01/01/20 < 2 < 2 <4 < 2 < 15 <2 < 2 < 2 < 7 MEAN

Table C-Vl.3 CONCENTRATIONS OF GAMMA EMITTERS IN AIR PARTICULATE SAMPLES COLLECTED IN THE VICINITY OF CLINTON POWER STATION, 2019 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 01/02/19 - 04/03/19 < 2 < 1 <4 < 2 < 18 < 2 < 2 < 3 < 10 04/03/19 - 07/03/19 < 2 <2 < 3 < 3 < 18 < 2 < 2 < 3 < 8 07/03/19 - 10/02/19 < 2 < 3 < 5 < 2 < 23 < 3 < 2 < 3 < 10 10/02/19 - 01/01/20 < 2 < 2 <4 < 2 < 17 <2 < 2 < 2 < 7 MEAN CL-8 01/02/19 - 04/03/19 < 3 < 3 < 5 < 2 < 17 < 3 < 2 < 3 < 10 04/03/19 - 07/03/19 < 3 < 3 < 3 < 3 < 19 < 3 < 2 < 3 < 10 07/03/19 - 10/02/19 < 3 <2 < 3 < 2 < 16 < 2 < 2 < 2 < 7 10/02/19 - 01/01/20 < 2 < 2 <4 < 2 < 20 < 2 < 2 < 2 < 7 MEAN C) CL-11 < 3 I 01/02/19 - 04/03/19 < 3 < 5 < 3 < 23 < 3 < 3 <3 < 11

..II.

.j::,. 04/03/19 - 07/03/19 < 2 < 3 <4 < 3 < 22 <2 < 2 <3 < 7 07/03/19 - 10/02/19 < 3 < 2 <4 < 2 < 12 <2 < 2 <2 < 8 10/02/19 - 01/01/20 < 3 < 3 <5 < 3 < 21 < 3 < 3 < 3 < 11 MEAN CL-15 01/02/19 - 04/03/19 < 2 < 3 < 4 < 2 < 23 < 2 <3 <2 < 7 04/03/19 - 07/03/19 < 3 < 3 <5 < 3 < 21 < 2 <2 <4 < 13 07/03/19 - 10/02/19 <2 < 2 <3 <2 < 15 < 2 <2 < 2 < 6 10/02/19 - 01/01/20 <2 < 2 <4 < 2 < 17 < 2 < 2 < 2 < 7 MEAN CL-94 01/02/19 - 04/03/19 < 3 < 3 < 5 < 3 < 24 < 3 < 3 <4 < 16 04/03/19 - 07/03/19 < 3 <2 <4 < 3 < 23 < 2 <2 <4 < 10 07/03/19 - 10/02/19 <4 < 3 < 5 < 2 < 22 < 2 < 2 <3 < 10 10/02/19 - 01/01/20 <3 <3 <4 < 3 < 22 < 3 < 2 <3 < 10 MEAN

Table C-Vll.1 CONCENTRATIONS OF 1-131 IN AIR IODINE SAMPLES COLLECTED IN THE VICINITY OF CLINTON POWER STATION, 2019 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 01/02/19 - 01/09/19 < 48 < 48 < 47 < 49 < 27 < 26 01/09/19 - 01/16/19 < 54 < 55 < 56 < 56 < 46 < 46 01/16/19 - 01/23/19 < 36 < 36 < 36 < 37 < 51 < 51 01/23/19 - 01/31/19 < 29 < 30 < 30 < 31 < 37 < 20 01/31/19 - 02/06/19 < 45 < 44 < 45 < 44 < 61 < 61 02/06/19 - 02/13/19 < 39 < 39 < 38 < 38 < 26 < 26 02/13/19 - 02/20/19 < 50 < 49 < 50 < 51 < 40 < 42 02/20/19 - 02/27/19 < 37 < 37 < 38 < 37 < 48 < 48 02/27/19 - 03/06/19 < 56 < 55 < 57 < 54 < 33 < 33 03/06/19 - 03/13/19 < 39 < 40 < 40 < 40 < 62 < 62 03/13/19 - 03/20/19 < 32 < 33 < 34 < 33 < 39 < 16 03/20/19 - 03/27/19 < 46 < 46 < 45 < 47 < 35 < 36 03/27/19 - 04/03/19 < 29 < 30 < 30 < 30 < 43 < 43 04/03/19 - 04/10/19 < 32 < 33 < 33 < 33 < 44 < 44 04/10/19 - 04/17/19 < 42 < 42 < 42 < 43 < 20 < 47 04/17/19 - 04/24/19 < 38 < 38 < 38 < 38 < 65 < 64 04/24/19 - 05/01/19 < 36 < 36 < 36 < 36 < 46 < 45 05/01 /19 - 05/08/19 < 40 < 40 < 40 < 17 < 30 < 29 05/08/19 - 05/15/19 < 52 < 52 < 52 < 22 < 36 < 15 05/15/19 - 05/22/19 < 36 < 36 < 36 < 36 < 23 < 23 05/22/19 - 05/29/19 < 45 < 45 < 46 < 46 < 32 < 32 05/29/19 - 06/05/19 < 42 < 42 < 42 < 42 < 22 < 22 06/05/19 - 06/12/19 < 28 < 30 < 29 < 29 < 34 < 33 06/12/19 - 06/19/19 < 32 < 32 < 32 < 32 < 35 < 35 06/19/19 - 06/26/19 < 65 < 66 < 65 < 66 < 48 < 49 06/26/19 - 07/03/19 < 68 < 68 < 69 < 69 < 36 < 36 07/03/19 - 07/10/19 < 39 < 39 < 39 < 39 < 24 < 42 07/10/19 - 07/17/19 < 58 < 58 < 58 < 58 < 43 < 43 07/17/19 - 07/24/19 < 24 < 21 < 24 < 24 < 36 < 37 07/24/19 - 07/31/19 < 22 < 26 < 20 < 20 < 37 < 16 07/31/19 - 08/07/19 < 38 < 38 < 32 < 32 < 47 < 47 08/07/19 - 08/14/19 < 48 < 50 < 49 < 49 < 56 < 56 08/14/19 - 08/21/19 < 44 < 44 < 44 < 19 < 42 < 42 08/21/19 - 08/28/19 < 41 < 41 < 41 < 41 < 41 < 21 08/28/19 - 09/04/19 < 21 < 25 < 25 < 25 < 27 < 33 09/04/19 - 09/11 /19 < 36 < 15 < 36 < 36 < 23 < 27 09/11/19 - 09/18/19 < 18 < 44 < 44 < 44 < 30 < 25 09/18/19 - 09/25/19 < 35 < 35 < 35 < 35 < 27 < 27 09/25/19 - 10/02/19 < 28 < 28 < 28 < 23 < 44 < 18 10/02/19 - 10/09/19 < 24 < 25 < 10 < 25 < 14 < 12 10/09/19 - 10/16/19 < 15 < 37 < 37 < 37 < 27 < 27 10/16/19 - 10/23/19 < 50 < 50 < 50 < 50 < 24 < 30 10/23/19 - 10/30/19 < 20 < 48 < 47 < 47 < 24 < 42 10/30/19 - 11/06/19 < 36 < 35 < 18 < 36 < 14 < 29 11/06/19 - 11 /13/19 < 32 < 15 < 32 < 32 < 13 < 28 11 /13/19 - 11 /20/19 < 36 < 38 < 36 < 36 < 37 < 36 11/20/19 - 11/27/19 < 37 < 32 < 38 < 38 < 39 < 40 11/27/19 - 12/04/19 < 31 < 31 < 31 < 26 < 18 < 18 12/04/19 - 12/11 /19 < 31 < 27 < 31 < 31 < 38 < 16 12/11/19 - 12/18/19 < 27 < 23 < 27 < 27 < 15 < 36 12/18/19 - 12/26/19 < 49 < 51 < 50 < 21 < 52 < 52 12/26/19 - 01/01/20 < 25 < 25 < 25 < 25 < 33 < 15 MEAN C-15

Table C-Vll.1 CONCENTRATIONS OF 1-131 IN AIR IODINE SAMPLES COLLECTED IN THE VICINITY OF CLINTON POWER STATION, 2019 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 01/02/19 - 01/09/19 < 20 < 11 < 26 < 26 01/09/19 - 01/16/19 < 19 < 46 < 46 < 19 01/16/19 - 01/23/19 < 20 < 18 < 51 < 51 01/23/19 - 01/31/19 < 25 < 37 < 37 < 37 01/31/19 - 02/06/19 < 38 < 25 < 60 < 60 02/06/19 - 02/13/19 < 16 < 22 < 26 < 26 02/13/19 - 02/20/19 < 18 < 22 < 41 < 40 02/20/19 - 02/27/19 < 29 < 20 < 47 < 47 02/27/1 9 - 03/06/1 9 < 23 < 28 < 34 < 34 03/06/19 - 03/13/1 9 < 33 < 25 < 61 < 61 03/13/19 - 03/20/19 < 28 < 39 < 39 < 38 03/20/19 - 03/27/19 < 20 < 35 < 29 < 35 03/27/19 - 04/03/19 < 16 < 24 < 42 < 42 04/03/1 9 - 04/10/19 < 27 < 18 < 44 < 43 04/10/19 - 04/17/19 < 18 < 47 < 47 < 47 04/17/19 - 04/24/19 < 21 < 64 < 63 < 34 04/24/19 - 05/01/19 < 15 < 18 < 45 < 45 05/01/19 - 05/08/19 < 41 < 24 < 28 < 28 05/08/19 - 05/15/19 < 51 < 36 < 36 < 36 05/15/19 - 05/22/19 < 15 < 19 < 23 < 23 05/22/19 - 05/29/19 < 19 < 26 < 32 < 32 05/29/19 - 06/05/19 < 18 < 22 < 22 < 9 06/05/19 - 06/12/19 < 25 < 28 < 33 < 33 06/12/19 - 06/19/19 < 18 < 35 < 35 < 12 06/19/19 - 06/26/19 < 28 < 20 < 49 < 48 06/26/19 - 07/03/19 < 29 < 30 < 36 < 35 07/03/19 - 07/10/19 < 16 < 43 < 43 < 42 07/10/19 - 07/17/19 < 25 < 42 < 42 < 35 07/17/19 - 07/24/19 < 25 < 15 < 37 < 37 07/24/19 - 07/31/19 < 21 < 36 < 36 < 36 07/31/19 - 08/07/19 < 26 < 47 < 46 < 20 08/07/19 - 08/14/19 < 21 < 24 < 57 < 56 08/14/19 - 08/21/19 < 44 < 41 < 34 < 41 08/21/19 - 08/28/19 < 23 < 39 < 39 < 40 08/28/19 - 09/04/19 < 25 < 33 < 33 < 32 09/04/19 - 09/11/19 < 36 < 27 < 27 < 28 09/11/19 - 09/18/19 < 44 < 30 < 30 < 30 09/18/19 - 09/25/19 < 15 < 27 < 23 < 27 09/25/19 - 10/02/19 < 28 < 44 < 44 < 43 10/02/19 - 10/09/19 < 25 < 13 < 13 < 14 10/09/19 - 10/16/19 < 37 < 23 < 27 < 27 10/16/19 - 10/23/19 < 21 < 30 < 30 < 29 10/23/19 - 10/30/19 < 48 < 42 < 41 < 41 10/30/19 - 11/06/19 < 36 < 28 < 29 < 29 11/06/19 - 11/13/19 < 32 < 28 < 27 < 28 11/13/19 - 11/20/19 < 18 < 36 < 36 (1) 11/20/19 - 11/27/19 < 38 < 19 < 40 < 39 11/27/19 - 12/04/19 < 31 < 18 < 18 < 16 12/04/19 - 12/11/19 < 32 < 38 < 38 < 38 12/11/19 - 12/18/19 < 28 < 36 < 35 < 35 12/18/19 - 12/26/19 < 50 < 50 < 51 < 21 12/26/19 - 01/01/20 < 25 < 33 < 34 < 34 MEAN (1) SEE PROGRAM EXCEPTIONS SECTION FOR EXPLANATION C-16

Table C-Vlll.1 CONCENTRATIONS OF 1-131 IN MILK SAMPLES COLLECTED IN THE VICINITY OF CLINTON POWER STATION, 2019 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION CONTROL FARM PERIOD CL-116 01/31/19 < 0.6 02/27/19 < 0.8 03/27/19 < 0.8 04/24/19 < 0.8 05/08/19 < 0.6 05/22/19 < 0.8 06/05/19 < 0.9 06/19/19 < 0.8 07/03/19 < 0.6 07/17/19 < 0.8 07/31/19 < 0.6 08/14/19 < 0.9 08/28/19 < 0.8 09/11/19 < 0.8 09/25/19 < 0.7 10/09/19 < 0.9 10/23/19 < 0.8 11/27/19 < 0.8 12/26/19 < 0.8 MEAN C-17

Table C-Vlll.2 CONCENTRATIONS OF GAMMA EMITTERS IN MILK SAMPLES COLLECTED IN THE VICINITY OF CLINTON POWER STATION, 2019 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 01/31/19 1127 +/- 137 < 5 < 6 < 13 < 7 < 12 < 5 < 11 < 7 < 6 < 25 < 7 < 40 02/27/19 855 +/- 149 < 7 < 6 < 16 < 9 < 16 < 6 < 11 < 6 < 7 < 20 < 5 < 39 03/27/19 1114 +/- 186 < 8 < 7 < 18 < 8 < 17 < 8 < 14 < 10 < 8 < 35 < 9 < 60 04/24/19 926 +/- 163 < 8 < 8 < 16 < 11 < 20 < 8 < 14 < 12 < 10 < 28 < 12 < 61 05/08/19 905 +/- 123 < 6 < 6 < 15 < 7 < 14 < 7 < 11 < 6 < 6 < 28 < 8 < 42 05/22/19 1169 +/- 164 < 7 < 6 < 16 < 7 < 16 < 9 < 11 < 9 < 8 < 41 < 9 < 54 06/05/19 938 +/- 174 < 7 < 9 < 15 < 9 < 17 < 8 < 16 < 10 < 9 < 33 < 13 < 60 06/19/19 1177 +/- 163 < 8 < 6 < 14 < 9 < 14 < 6 < 15 < 7 < 8 < 36 < 11 < 59 07/03/19 979 +/- 165 < 8 < 8 < 16 < 7 < 16 < 8 < 15 < 11 < 8 < 35 < 12 < 62 07/17/19 1048 +/- 149 < 7 < 6 < 14 < 8 < 18 < 7 < 12 < 7 < 7 < 36 < 9 < 56 07/31/19 1041 +/- 166 < 7 < 8 < 15 < 8 < 18 < 7 < 13 < 9 < 7 < 26 < 10 < 47

(") 08/14/19 932 +/- 170 < 6 < 11 < 17 < 10 < 17 < 7 < 15 < 9 < 8 < 36 < 11 < 62 I

08/28/19 1017 +/- 148 < 7 < 7 < 16 < 9 < 15 < 8 < 12 < 8 < 7 < 30 < 10 < 49 co 09/11/19 614 +/- 140 < 8 < 8 < 18 < 10 < 18 < 8 < 13 < 9 < 9 < 31 < 12 < 62 09/25/19 1265 +/- 201 < 8 < 7 < 22 < 7 < 20 < 10 < 15 < 9 < 10 < 42 < 9 < 62 10/09/19 1302 +/- 171 < 7 < 8 < 15 < 8 < 18 < 9 < 12 < 8 < 8 < 34 < 8 < 54 10/23/19 1169 +/- 187 < 10 < 9 < 17 < 10 < 21 < 8 < 12 < 8 < 9 < 39 < 10 < 63 11/27/19 855 +/- 169 < 8 < 8 < 17 < 12 < 15 < 9 < 14 < 10 < 8 < 44 < 12 < 62 12/26/19 1156 +/- 158 < 7 < 6 < 16 < 7 < 14 < 6 < 11 < 8 < 8 < 25 < 7 < 45 MEAN 1031 +/- 335 THE MEAN AND 7WO 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, 2019 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-14' CL-114 Cabbage 06/26/19 < 29 < 27 < 53 < 29 < 60 < 38 < 60 < 52 < 33 < 35 < 137 < 36 < 187 Lettuce 06/26/19 < 35 < 31 < 85 < 40 < 77 < 39 < 73 < 52 < 40 < 29 < 152 < 52 < 193 Swiss Chard 06/26/19 < 25 < 24 < 50 < 20 < 60 < 25 < 43 < 39 < 26 < 29 < 112 < 35 < 145 Cabbage/Lettuce 07/31/19 < 25 < 31 < 68 < 35 < 62 < 31 < 47 < 45 < 40 < 28 < 150 < 36 < 203 Lettuce 07/31/19 < 29 < 30 < 50 < 23 < 72 < 31 < 61 < 41 < 33 < 28 < 109 < 50 < 169 Swiss Chard 07/31/19 < 34 < 32 < 84 < 35 < 76 < 35 < 59 < 49 < 33 < 34 < 137 < 32 < 235 Com 08/28/19 < 27 < 23 < 48 < 27 < 39 < 21 < 42 < 35 < 24 < 23 < 101 < 28 < 147 Lettuce 08/28/19 < 26 < 27 < 61 < 30 < 65 < 28 < 43 < 38 < 37 < 33 < 103 < 35 < 144 Swiss Chard 08/28/19 < 24 < 21 < 62 < 19 < 48 < 26 < 46 < 40 < 30 < 25 < 111 < 28 < 134 Com 09/25/19 < 28 < 31 < 72 < 33 < 55 < 39 < 64 < 39 < 33 < 37 < 123 < 54 < 151 Swiss Chard 09/25/19 < 28 < 30 < 60 < 26 < 76 < 29 < 47 < 29 < 35 < 28 < 92 < 24 < 173 Swiss Chard 09/25/19 < 35 < 42 < 86 < 50 < 89 < 52 < 66 < 51 < 43 < 38 < 159 < 48 < 241 MEAN 0I

~

(C CL-115 Cabbage 06/26/19 < 25 < 32 < 73 < 41 < 51 < 22 < 56 < 44 < 25 < 30 < 117 < 39 < 172 Lettuce 06/26/19 < 18 < 18 < 42 < 21 < 46 < 20 < 31 < 27 < 21 < 19 < 76 < 24 < 89 Swiss Chard 06/26/19 < 31 < 32 < 57 < 29 < 63 < 28 < 44 < 42 < 26 < 30 < 117 < 42 < 180 Cabbage 07/31/19 < 23 < 26 < 45 < 33 < 55 < 23 < 47 < 42 < 31 < 33 < 115 < 32 < 140 Lettuce 07/31/19 < 31 < 31 < 69 < 32 < 70 < 35 < 45 < 47 < 34 < 34 < 125 < 26 < 181 Swiss Chard 07/31/19 < 29 < 30 < 78 < 29 < 77 < 35 < 45 < 47 < 33 < 28 < 114 < 27 < 193 Cabbage 08/28/19 < 28 < 29 < 52 < 34 < 79 < 27 < 54 < 42 < 32 < 32 < 133 < 36 < 185 Lettuce 08/28/19 < 24 < 22 < 52 < 22 < 50 < 28 < 40 < 38 < 27 < 23 < 119 < 26 < 135 Swiss Chard 08/28/19 < 24 < 27 < 57 < 32 < 66 < 26 < 54 < 37 < 28 < 28 < 95 < 38 < 151 Cabbage 09/25/19 < 23 < 21 < 47 < 32 < 51 < 22 < 41 < 22 < 31 < 25 < 81 < 30 < 141 Cabbage 09/25/19 < 28 < 28 < 72 < 37 < 51 < 30 < 42 < 36 < 31 < 31 < 98 < 41 < 145 Swiss Chard 09/25/19 < 27 < 25 < 65 < 25 < 81 < 28 < 41 < 28 < 37 < 30 < 106 < 34 < 162 MEAN

Table C-IX.1 CONCENTRATIONS OF GAMMA EMITTERS IN VEGETATION SAMPLES COLLECTED IN THE VICINITY OF CLINTON POWER STATION, 2019 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-14' CL-117 Cabbage 06/26/19 < 22 < 22 < 41 < 24 < 43 < 15 < 34 < 32 < 21 < 25 < 84 < 12 < 108 Lettuce 06/26/19 < 21 < 28 < 57 < 26 < 46 < 22 < 42 < 40 < 30 < 23 < 124 < 38 < 159 Swiss Chard 06/26/19 < 18 < 21 < 52 < 22 < 45 < 23 < 38 < 31 < 29 < 23 < 91 < 22 < 105 Cabbage 07/31/19 < 27 < 26 < 58 < 30 < 57 < 31 < 58 < 42 < 35 < 26 < 148 < 32 < 175 Lettuce 07/31/19 < 28 < 29 < 73 < 36 < 69 < 29 < 51 < 49 < 36 < 32 < 150 < 36 < 207 Swiss Chard 07/31/19 < 30 < 29 < 75 < 37 < 81 < 30 < 54 < 50 < 35 < 33 < 122 < 30 < 203 Cabbage 08/28/19 < 28 < 26 < 54 < 32 < 57 < 26 < 44 < 44 < 28 < 32 < 148 < 39 < 160 Lettuce 08/28/19 < 30 < 23 < 77 < 32 < 70 < 36 < 52 < 55 < 31 < 30 < 136 < 31 < 165 Swiss Chard 08/28/19 < 27 < 27 < 57 < 30 < 64 < 31 < 55 < 40 < 33 < 28 < 136 < 34 < 163 Cabbage 09/25/19 < 30 < 31 < 61 < 29 < 69 < 34 < 47 < 33 < 33 < 30 < 121 < 40 < 203 Cabbage 09/25/19 < 22 < 26 < 33 < 25 < 49 < 18 < 32 < 25 < 23 < 22 < 91 < 21 < 122 Swiss Chard 09/25/19 < 24 < 22 < 48 < 28 < 59 < 25 < 40 < 28 < 28 < 28 < 85 < 18 < 139 MEAN C')

I N

0 CL-118 Cabbage 06/26/19 < 25 < 22 < 56 < 30 < 56 < 24 < 33 < 41 < 27 < 26 < 112 < 34 < 155 Lettuce 06/26/19 < 19 < 21 < 43 < 29 < 51 < 22 < 39 < 32 < 22 < 20 < 83 < 26 < 150 Swiss Chard 06/26/19 < 23 < 20 < 49 < 30 < 53 < 23 < 39 < 37 < 25 < 23 < 89 < 30 < 131 Cabbage 07/31/19 < 29 < 37 < 76 < 24 < 80 < 24 < 58 < 49 < 33 < 28 < 139 < 46 < 220 Lettuce 07/31/19 < 25 < 24 < 65 < 25 < 59 < 25 < 43 < 34 < 22 < 26 < 95 < 30 < 146 Swiss Chard 07/31/19 < 23 < 24 < 73 < 36 < 69 < 26 < 53 < 40 < 37 < 26 < 115 < 37 < 164 Cabbage 08/28/19 < 31 < 27 < 62 < 29 < 52 < 28 < 51 < 37 < 34 < 28 < 117 < 26 < 144 Lettuce 08/28/19 < 28 < 28 < 52 < 25 < 79 < 26 < 54 < 44 < 34 < 31 < 128 < 20 < 168 Swiss Chard 08/28/19 < 19 < 16 < 44 < 24 < 42 < 21 < 44 < 34 < 23 < 21 < 83 < 23 < 112 Cabbage 09/25/19 < 28 < 26 < 53 < 38 < 57 < 26 < 50 < 28 < 30 < 29 < 99 < 28 < 161 Cabbage 09/25/19 < 33 < 30 < 67 < 27 < 60 < 32 < 49 < 38 < 37 < 32 < 113 < 32 < 197 Swiss Chard 09/25/19 < 25 < 28 < 59 < 28 < 64 < 24 < 44 < 39 < 31 < 28 < 105 < 36 < 127 MEAN

Table C-IX.2 CONCENTRATIONS OF GAMMA EMITTERS IN GRASS SAMPLES COLLECTED IN THE VICINITY OF CLINTON POWER STATION, 2019 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 05/08/19 < 27 < 26 < 50 < 29 < 58 < 25 < 37 < 35 < 24 < 22 < 81 < 27 < 134 05/22/19 < 23 < 29 < 54 < 23 < 50 < 19 < 44 < 31 < 24 < 24 < 94 < 23 < 151 06/05/19 < 37 < 36 < 80 < 43 < 77 < 36 < 54 < 48 < 32 < 35 < 108 < 44 < 207 06/19/19 < 35 < 32 < 97 < 34 < 82 < 34 < 56 < 51 < 39 < 41 < 145 < 42 < 198 07/03/19 < 35 < 29 < 77 < 39 < 62 < 30 < 50 < 59 < 35 < 35 < 143 < 46 < 208 07/17/19 < 13 < 13 < 29 < 13 < 29 < 13 < 20 < 21 < 13 < 13 < 58 < 14 < 64 07/31/19 < 23 < 33 < 68 < 40 < 53 < 29 < 50 < 49 < 32 < 27 < 114 < 43 < 169 08/14/19 < 28 < 28 < 56 < 24 < 58 < 35 < 51 < 40 < 29 < 33 < 113 < 32 < 173 08/28/19 < 30 < 31 < 72 < 33 < 69 < 30 < 51 < 47 < 36 < 32 < 139 < 26 < 191 09/11/19 < 27 < 28 < 75 < 39 < 98 < 31 < 61 < 56 < 39 < 37 < 126 < 39 < 196 09/25/19 < 25 < 28 < 65 < 30 < 75 < 31 < 49 < 43 < 29 < 31 < 125 < 38 < 191 10/09/19 < 32 < 37 < 86 < 38 < 92 < 34 < 60 < 56 < 37 < 42 < 141 < 47 < 227 0I < 44 < 139 < 32 < 264 10/23/19 < 34 < 32 < 75 < 42 < 69 < 37 < 62 < 52 < 36 I\)

~

MEAN CL-02 05/08/19 < 29 < 29 < 64 < 25 < 68 < 30 < 36 < 39 < 25 < 28 < 121 < 35 < 174 05/22/19 < 38 < 31 < 68 < 41 < 89 < 39 < 59 < 47 < 43 < 45 < 142 < 51 < 250 06/05/19 < 26 < 29 < 70 < 36 < 76 < 31 < 44 < 51 < 35 < 30 < 112 < 46 < 167 06/19/19 < 39 < 37 < 86 < 36 < 64 < 36 < 68 < 53 < 31 < 34 < 137 < 35 < 205 07/03/19 < 32 < 32 < 70 < 28 < 70 < 28 < 57 < 55 < 32 < 36 < 155 < 35 < 242 07/17/19 < 12 < 13 < 28 < 14 < 30 < 13 < 22 < 21 < 14 < 14 < 56 < 17 < 82 07/31/19 < 30 < 36 < 83 < 27 < 85 < 35 < 63 < 55 < 45 < 37 < 137 < 40 < 229 08/14/19 < 34 < 41 < 71 < 47 < 101 < 36 < 71 < 57 < 45 < 40 < 171 < 33 < 249 08/28/19 < 33 < 29 < 50 < 31 < 54 < 31 < 54 < 55 < 33 < 28 < 119 < 35 < 179 09/11/19 < 30 < 32 < 56 < 37 < 69 < 38 < 55 < 47 < 40 < 37 < 137 < 39 < 198 09/25/19 < 32 < 34 < 78 < 38 < 86 < 39 < 61 < 59 < 43 < 35 < 160 < 32 < 242 10/09/19 < 37 < 32 < 74 < 40 < 91 < 28 < 56 < 53 < 33 < 34 < 133 < 31 < 236 10/23/19 < 40 < 32 < 78 < 45 < 68 < 37 < 66 < 56 < 35 < 37 < 166 < 43 < 232 MEAN

Table C-IX.2 CONCENTRATIONS OF GAMMA EMITTERS IN GRASS SAMPLES COLLECTED IN THE VICINITY OF CLINTON POWER STATION, 2019 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 05/08/19 < 25 < 24 < 67 < 24 < 66 < 28 < 44 < 46 < 31 < 28 < 107 < 26 < 198 05/22/19 < 26 < 25 < 59 < 27 < 68 < 27 < 49 < 37 < 34 < 30 < 111 < 32 < 175 06/05/19 < 29 < 27 < 54 < 32 < 62 < 24 < 48 < 41 < 28 < 28 < 108 < 34 < 172 06/19/19 < 35 < 33 < 73 < 43 < 79 < 34 < 52 < 50 < 35 < 41 < 145 < 48 < 228 07/03/19 < 31 < 23 < 67 < 29 < 67 < 36 < 47 < 49 < 24 < 27 < 136 < 33 < 194 07/17/19 < 12 < 11 < 25 < 10 < 27 < 12 < 21 < 18 < 12 < 11 < 51 < 15 < 69 07/31/19 < 23 < 30 < 55 < 23 < 86 < 34 < 48 < 42 < 35 < 33 < 128 < 37 < 186 08/14/19 < 21 < 20 < 64 < 37 < 61 < 28 < 44 < 30 < 27 < 28 < 95 < 26 < 129 08/28/19 < 27 < 26 < 58 < 24 < 69 < 31 < 42 < 35 < 26 < 24 < 103 < 27 < 133 09/11/19 < 14 < 13 < 33 < 16 < 33 < 15 < 24 < 22 < 15 < 14 < 64 < 19 < 71 09/25/19 < 37 < 33 < 82 < 35 < 86 < 36 < 72 < 58 < 40 < 34 < 170 < 36 < 245 10/09/19 < 30 < 39 < 75 < 37 < 78 < 40 < 52 < 55 < 38 < 40 < 173 < 35 < 221

(')

N I 10/23/19 < 30 < 22 < 85 < 43 < 71 < 27 < 47 < 42 < 20 < 30 < 134 < 18 < 169 N

MEAN CL-116 05/08/19 < 23 < 20 < 54 < 26 < 53 < 17 < 38 < 35 < 33 < 26 < 101 < 27 < 150 05/22/19 < 25 < 21 < 38 < 18 < 52 < 25 < 37 < 30 < 28 < 27 < 90 < 25 < 147 06/05/19 < 32 < 37 < 90 < 44 < 95 < 36 < 53 < 58 < 43 < 39 < 161 < 25 < 204 06/19/19 < 33 < 25 < 80 < 26 < 58 < 33 < 71 < 44 < 35 < 34 < 174 < 32 < 203 07/03/19 < 29 < 26 < 63 < 38 < 67 < 32 < 41 < 50 < 35 < 27 < 157 < 54 < 141 07/17/19 < 26 < 23 < 55 < 27 < 71 < 27 < 44 < 30 < 23 < 26 < 122 < 24 < 152 07/31/19 < 28 < 31 < 69 < 28 < 67 < 31 < 47 < 46 < 29 < 31 < 140 < 32 < 188 08/14/19 < 26 < 27 < 53 < 23 < 55 < 25 < 45 < 37 < 31 < 25 < 129 < 35 < 156 08/28/19 < 22 < 20 < 63 < 26 < 49 < 25 < 39 < 39 < 30 < 25 < 96 < 23 < 138 09/11/19 < 26 < 31 < 65 < 29 < 68 < 33 < 54 < 52 < 36 < 34 < 140 < 47 < 215 09/25/19 < 30 < 36 < 62 < 32 < 84 < 41 < 54 < 53 < 38 < 32 < 138 < 31 < 252 10/09/19 < 37 < 38 < 59 < 35 < 84 < 36 < 50 < 52 < 33 < 40 < 136 < 51 < 194 10/23/19 < 37 < 34 < 77 < 35 < 87 < 42 < 73 < 55 < 34 < 45 < 130 < 26 < 245 MEAN

Table C-X.1 QUARTERLY DLR RES ULTS FOR CLINTON POWER STATION, 2019 Qtr 1 Qtr 2 Qtr 3 Qtr4 Normalized Annual BA+ Annual Facility Location 8}11 (mrem) (mrem) (mrem) (mrem) Dose, MA (mrem/yr) MDD} 21 Dose, FA (mrem)

CL-01 17.3 13.5 19.3 19.3 69.4 74.0 83.6 ND CL-02 17.8 18.6 21.2 19.1 76.7 76.7 86.2 ND CL-03 17.2 19.0 19.7 20.4 76.3 74.7 84.2 ND CL-04 17.2 19.4 20.2 19.1 75.9 72.8 82.3 ND CL-05 17.3 19.1 21.3 19.8 77.5 76.5 86.0 ND CL-06 15.1 16.0 17.7 17.5 66.3 65.8 75.3 ND CL-07 15.9 16.9 19.8 17.9 70.5 69.5 79.0 ND CL-08 17.0 18.7 18.1 17.2 71.0 74.0 83.5 ND CL-11 15.9 17.0 18.6 18.1 69.6 69.3 78.8 ND CL-15 14.8 16.9 16.6 15.9 64.2 66.3 75.8 ND CL-22 16.1 18.9 20.9 20.6' 76.5 77.6 87.1 ND CL-23 18.1 20.5 21.3 19.3 79.2 81.5 91.0 ND CL-24 17.0 20.1 21.2 20.7 79.0 80.5 90.0 ND CL-33 17.6 18.5 22.3 19.1 77.5 79.2 88.7 ND CL-34 16.8 18.2 17.2 17.9 70.1 77.5 87.0 ND CL-35 16.2 18.1 19.7 17.6 71.6 71.6 81.1 ND CL-36 16.7 18.1 21.1 18.6 74.5 74.2 83.7 ND CL-37 16.3 18.1 21.8 18.2 74.4 71.1 80.6 ND CL-41 17.9 20.5 20.2 20.6 79.2 79.4 88.9 ND Cl-42 16.7 17.5 19.6 18.7 72.5 74.2 83.7 ND CL-43 17.4 20.3 22.8 20.9 81.4 79.7 89.2 ND CL-44 16.4 17.9 19.4 19.0 72.7 75.4 84.9 ND CL-45 18.0 21.8 23.6 19.9 83.3 80.6 90.1 ND CL-46 18.1 18.3 20.5 18.7 75.6 73.0 82.5 ND CL-47 17.7 19.3 22.5 19.7 79.2 79.4 88.9 ND CL-48 16.5 19.7 19.4 19.0 74.6 74.2 83.7 ND CL-49 17.6 18.6 19.4 20.0 75.6 79.8 89.3 ND CL-51 17.2 20.4 22.2 21.9 81.7 76.6 86.1 ND CL-52 16.7 19.9 19.6 20.5 76.7 75.6 85.1 ND CL-53 15.4 17.1 19.1 18.2 69.8 71.9 81.4 ND CL-54 17.9 19.3 21.0 20.7 78.9 78.0 87.5 ND CL-55 17.2 19.4 21.1 20.9 78.6 78.7 88.2 ND CL-56 18.6 20.0 22.9 20.6 82.1 81.0 90.5 ND CL-57 16.5 21.2 22.8 20.7 81.2 81.5 91.0 ND CL-58 17.1 19.3 20.5 20.4 77.3 79.1 88.6 ND CL-60 17.4 19.7 20.8 19.5 77.4 79.0 88.5 ND CL-61 16.4 18.3 21.2 19.0 74.9 78.1 87.6 ND CL-63 14.9 19.8 18.6 16.8 70.1 66.6 76.1 ND CL-64 17.3 18.2 19.7 18.9 74.1 75.9 85.4 ND CL-65 19.9 22.2 21.9 20.6 84.6 80.5 90.01 ND CL-74 15.0 17.1 16.9 17.8 66.8 68 77.51 ND CL-75 17.7 18.5 18.9 20.4 75.5 75.7 85.21 ND CL-76 17.2 20.1 21.0 20.4 78.7 78.7 88.21 ND CL-77 16.2 18.0 18.8 18.6 71.6 72.2 81.71 ND CL-78 18.2 20.6 19.0 20.0 77.8 72 81.51 ND CL-79 16.1 19.5 19.9 19.8 75.3 77.1 86.61 ND CL-80 17.0 19.2 20.6 19.5 76.3 75.5 85.01 ND CL-81 17.4 19.1 21.1 20.0 77.6 76.8 86.31 ND CL-84 16.7 19.5 20.6 18.9 75.7 76.3 85.81 ND CL-90 14.1 15.8 15.1 15.0 60 62.2 71.71 ND CL-91 15.6 18.8 18.6 18.4 71.4 69.5 79.01 ND CL-97 16.9 20.3 20.4 19.9 77.5 77.6 87.11 ND CL-99 13.5 15.1 16.1 16.1 60.8 60.6 70.11 ND CL-114 15.3 19.3 19.3 19.1 73.0 72.3 81.8 ND 1

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

<l Minimum differential dose (MDDA): The smallest amount of facility related dose at each monitored location annually above the baseline background dose that can be reliably detected by an environmental dosimetry system C-23

FIGURE C-1 MEAN MONTHLY GROSS BETA CONCENTRATION IN AIR PARTICULATE SAMPLES COLLECTED IN THE VICINITY OF CPS, 2019 0.047 0.042 E

0.037 0.032 0

~

C.

0.027

>j:::

0.022 0

<(

0.017 0.012 0.007 MONTH PRE-OP (ALL SITES)

-A- 2019 INDICATOR

.....,_ 2019 CONTROL C-24

FIGURE C-2 MEAN QUARTERLY AMBIENT GAMMA RADIATION LEVELS (DLR) IN THE VICINITY OF CPS, 2019 40 35 E

a:: 30 Q)

E 25 20 15 10

• PRE-OP D2019 indicator

• 2019 control C-25

Intentionally left blank APPENDIX D INTER-LABORATORY COMPARISON PROGRAM

Intentionally Left Blank Analytics Environmental Radioactivity Cross Check Program Table D.1 Teledyne Brown Engineering Environmental Services TBE Identification Known Ratio of TBE to Month/Year Matrix Nuclide Units Reported Evaluation (bl Number Value (a) Analytics Result Value March 2019 E12468A Milk Sr-89 pCi/L 87.1 96 0.91 A Sr-90 pCi/L 12.6 12.6 1.00 A E12469A Milk Ce-141 pCi/L 113 117 0.97 A Co-58 pCi/L 153 143 1.07 A Co-60 pCi/L 289 299 0.97 A Cr-51 pCi/L 233 293 0.80 A Cs-134 pCi/L 147 160 0.92 A Cs-137 pCi/L 193 196 0.98 A Fe-59 pCi/L 153 159 0.96 A 1-131 pCi/L 91.5 89.5 1.02 A Mn-54 pCi/L 149 143 1.04 A Zn-65 pCi/L 209 220 0.95 A E12470 Charcoal 1-131 pCi 77.5 75.2 1.03 A E12471 AP Ce-141 pCi 60.7 70.2 0.87 A Co-58 pCi 87.9 85.8 1.02 A Co-60 pCi 175 179 0.98 A Cr-51 pCi 165 176 0.94 A Cs-134 pCi 91.2 95.9 0.95 A Cs-137 pCi 120 118 1.02 A Fe-59 pCi 108 95.3 1.13 A Mn-54 pCi 94.2 85.7 1.10 A Zn-65 pCi 102 132 0.77 w E12472 Water Fe-55 pCi/L 2230 1920 1.16 A E12473 Soil Ce-141 pCi/g 0.189 0.183 1.03 A Co-58 pCi/g 0.209 0.224 0.93 A Co-60 pCi/g 0.481 0.466 1.03 A Cr-51 pCi/g 0.522 0.457 1.14 A Cs-134 pCi/g 0.218 0.250 0.87 A Cs-137 pCi/g 0.370 0.381 0.97 A Fe-59 pCi/g 0.263 0.248 1.06 A Mn-54 pCi/g 0.248 0.223 1.11 A Zn-65 pCi/g 0.371 0.344 1.08 A E12474 AP Sr-89 pCi 88.3 95.2 0.93 A Sr-90 pCi 11.7 12.5 0.94 A August 2019 E12562 Soil Sr-90 pCi/g 4.710 6.710 0.70 w (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)

D-1

Analytics Environmental Radioactivity Cross Check Program Table 0.1 Teledyne Brown Engineering Environmental Services TBE Identification Known Ratio ofTBE to Month/Year Matrix Nuclide Units Reported Evaluation (b)

Number Value (a) Analytics Result Value September 2019 E12475 Milk Sr-89 pCi/L 70.0 93.9 0.75 w Sr-90 pCi/L 12.0 12.9 0.93 A E12476 Milk Ce-141 pCi/L 150 167 0.90 A Co-58 pCi/L 170 175 0.97 A Co-60 pCi/L 211 211 1.00 A Cr-51 pCi/L 323 331 0.98 A Cs-134 pCi/L 180 207 0.87 A Cs-137 pCi/L 147 151 0.97 A Fe-59 pCi/L 156 148 1.05 A 1-131 pCi/L 81.1 92.1 0.88 A Mn-54 pCi/L 160 154 1.04 A Zn-65 pCi/L 303 293 1.03 A E12477 Charcoal 1-131 pCi 95.9 95.1 1.01 A E12478 AP Ce-141 pCi 129 138 0.93 A Co-58 pCi 128 145 0.88 A Co-60 pCi 181 174 1.04 A Cr-51 pCi 292 274 1.07 A Cs-134 pCi 166 171 0.97 A Cs-137 pCi 115 125 0.92 A Fe-59 pCi 119 123 0.97 A Mn-54 pCi 129 128 1.01 A Zn-65 pCi 230 242 0.95 A E12479 Water Fe-55 pCi/L 1810 1850 0.98 A E12480 Soil Ce-141 pCi/g 0.305 0.276 1.10 A Co-58 pCi/g 0.270 0.289 0.93 A Co-60 pCi/g 0.358 0.348 1.03 A Cr-51 pCi/g 0.765 0.547 1.40 N(1)

Cs-134 pCi/g 0.327 0.343 0.95 A Cs-137 pCi/g 0.308 0.321 0.96 A Fe-59 pCi/g 0.257 0.245 1.05 A Mn-54 pCi/g 0.274 0.255 1.07 A Zn-65 pCi/g 0.536 0.485 1.11 A E12481 AP Sr-89 pCi 95.9 91.9 1.04 A Sr-90 pCi 12.3 12.6 0.97 A E12563 Soil Sr-90 pCi/g 0.392 0.360 1.09 A (a) The Analytics known value is equal to 100% of the parameter present in the standard as determined by gravimetric and/or volumetric measurements made during standard preparation (b) Analytics evaluation based on TBE internal QC limits:

A= Acceptable - reported result falls within ratio limits of 0.80-1.20 W =Acceptable with warning- reported result falls within 0. 70-0.80 or 1.20-1.30 N =Not Acceptable - reported result falls outside the ratio limits of< 0. 70 and > 1.30 (1) See NCR 19-27 (Page 2 of 2) 0-2

DOE's Mixed Analyte Performance Evaluation Program (MAPEP)

Table D.2 Teledyne Brown Engineering Environmental Services TBE Identification Known Acceptance Month/Year Matrix Nuclide Units Reported Evaluation (bl Number Value (a) Range Value February 2019 19-GrF40 AP Gross Alpha Sq/sample 0.184 0.528 0.158 - 0.898 A Gross Beta Sq/sample 0.785 0.948 0.474-1.422 A 19-MaS40 Soil Ni-63 Bq/kg 420 519.0 363 - 675 A Sr-90 Bq/kg (1) NR(3l 19-MaW40 Water Am-241 . Bq/L 0.764 0.582 0.407 - 0.757 N(4l Ni-63 Bq/L 4.72 5.8 4.1 - 7.5 A Pu-238 Bq/L 0.443 0.451 0.316 - 0.586 A Pu-239/240 Bq/L -0.00161 0.0045 (2) A 19-RdF40 AP U-234/233 Sq/sample 0.1138 0.106 0.074-0.138 A U-238 Sq/sample 0.107 0.110 0.077 - 0.143 A 19-RdV40 Vegetation Cs-134 Sq/sample 2.14 2.44 1.71 -3.17 A Cs-137 Sq/sample 2.22 2.30 1.61 - 2.99 A Co-57 Sq/sample 2.16 2.07 1.45 - 2.69 A Co-60 Sq/sample 0.02382 (1) A Mn-54 Sq/sample -0.03607 (1) A Sr-90 Sq/sample -0.1060 (1) N,si Zn-65 Sq/sample 1.35 1.71 1.20 - 2.22 w August 2019 19-GrF41 AP Gross Alpha Sq/sample 0.192 0.528 0.158 - 0.898 w Gross Beta Sq/sample 0.722 0.937 0.469 - 1.406 A 19-MaS41 Soil Ni-63 Bq/kg 436 629 440 - 818 N(Bl Sr-90 Bq/kg 444 572 400- 744 w 19-MaW41 Water Am-241 Bq/L NR(7l Ni-63 Bq/L 7.28 9.7 6.8 - 12.6 w Pu-238 Bq/L 0.0207 0.0063 (2) A Pu-239/240 Bq/L 0.741 0.727 0.509 - 0.945 A 19-RdF41 AP U-234/233 Sq/sample 0.0966 0.093 0.065-0.121 A U-238 Sq/sample 0.0852 0.096 0.067-0.125 A 19-RdV41 Vegetation Cs-134 Sq/sample 0.0197 (1) A Cs-137 Sq/sample 3.21 3.28 2.30 - 4.26 A Co-57 Sq/sample 4.62 4.57 3.20 - 5.94 A Co-60 Sq/sample 4.88 5.30 3.71 - 6.89 A Mn-54 Sq/sample 4.54 4.49 3.14 - 5.84 A Sr-90 Sq/sample 0.889 1.00 0.70-1.30 A Zn-65 Sq/sample 2.78 2.85 2.00 - 3.71 A (a) The MAPEP known value is equal to 100% of the parameter present in the standard as determined by gravimetric and/or volumetric measurements made during standard preparation (b) DOEIMAPEP evaluation:

A =Acceptable - 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 NR =Not Reported (1) False positive test (2) Sensitivity evaluation (3) See NCR 19-12 (4) See NCR 19-13 (5) See NCR 19-14 (6) See NCR 19-25 (7) See NCR 19-26 (Page 1 of 1) 0-3

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<*l Limits Value April 2019 Rad-117 Water Ba-133 pCi/L 26.3 24.1 18.6-27.8 A Cs-134 pCi/L 15.2 12.1 8.39 - 14.4 Nc1J Cs-137 pCi/L 33.6 33.1 28.8 - 39.4 A Co-60 pCi/L 11.9 11.5 8.67 - 15.5 A Zn-65 pCi/L 87.1 89.2 80.3 -107 A GR-A pCi/L 19 19.3 9.56- 26.5 A GR-B pCi/L 20.2 29.9 19.1-37.7 A U-Nat pCi/L 55.5 55.9 45.6 - 61.5 A H-3 pCi/L 21500 21400 18700 - 23500 A Sr-89 pCi/L 44.9 33.3 24.5 - 40.1 Nc2, Sr-90 pCi/L 24.5 26.3 19.0- 30.7 A 1-131 pCi/L 28.9 28.4 23.6 - 33.3 A October 2019 Rad-119 Water Ba-133 pCi/L 42.7 43.8 35.7 - 48.8 A Cs-134 pCi/L 53.5 55.9 45.2 - 61.5 A Cs-137 pCi/L 77.7 78.7 70.8 - 89.2 A Co-60 pCi/L 51.5 53.4 48.1 - 61.3 A Zn-65 pCi/L 36.6 34.0 28.5 - 43.1 A GR-A pCi/L 40.5 27.6 14.0 - 36.3 NC3J GR-B pCi/L 36.3 39.8 26.4-47.3 A U-Nat pCi/L 27.66 28.0 22.6 - 31.1 A H-3 pCi/L 22800 23400 20500 - 25700 A Sr-89 pCi/L 47.1 45.5 35.4- 52.7 A Sr-90 pCi/L 32.5 26.5 19.2 - 30.9 NC4l 1-131 pCi/L 26.0 23.9 19.8 - 28.4 A December 2019 QR 120419D Water Sr-90 pCi/L 20.1 18.6 13.2 - 22.1 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 19-10 (2) See NCR 19-11 (3) See NCR 19-23 (4) See NCR 19-24 (Page 1 of 1)

D-4

APPENDIX E ERRATA DATA

Intentionally Left Blank There was no errata data for 2019.

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 ..................................................................................................................... 3 A. Objectives of the RGPP ...................................................................................... 3 B. Implementation of the Objectives ........................................................................ 3 C. Program Description **************************************************'.**************************************** 4 D. Characteristics of Tritium (H-3) .................................. ,........................................ 5 111. Program Description ...................................................................................................... 6 A. Sample Analysis .................................................................................................. 6 B. Data Interpretation ............................................................................................... 6 C. Background.Analysis ........................................................................................... 7

1. Background Concentrations of Tritium ..................................................... 8 IV. Results and Discussion ................................................................................................. 9 A. Program Exceptions ............................................................................................ 9 B. Program Changes ............................................................................................... 9 C. Groundwater Results ........................................................................................ 10 D. Surface Water Results ...................................................................................... 11 E. Precipitation Water Results (Recapture) ........................................................... 11 F. Summary of Results - Inter-laboratory Comparison Program ........................... 11 G. Errata Data ......................................................................................................... 11 H. Leaks, Spills and Releases ................................................................................ 11 I. Trends .................................................................................................................. 12 J. Investigations ..................................................................................................... 12 K. Actions Taken ..................................................................................................... 12

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, 2019.

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 8-1.1 Concentrations of Tritium, Strontium, Gross Alpha, and Gross Beta in Groundwater Samples Collected in the Vicinity of Clinton Power Station, 2019 Table B-1.2 Concentrations of Gamma Emitters in Groundwater Samples Collected in the Vicinity of Clinton Power Station, 2019 Table B-1.3 Concentrations of Hard To Detects in Groundwater Samples Collected in the Vicinity of Clinton Power Station, 2019 Table 8-11.1 Concentrations of Tritium in Surface Water Samples Collected in the Vicinity of Clinton Power Station, 2019 Table 8-11.2 Concentrations of Gamma Emitters in Surface Water Samples Collected in the Vicinity of Clinton Power Station, 2019 Table B-111.1 Concentrations of Tritium in Precipitation Water Samples Collected in the Vicinity of Clinton Power Station, 2019 ii

I. Summary and Conclusions In 2006, Exelon instituted a comprehensive program to evalu;:ite 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 2019. During that time period, 236 analyses were performed on 92 samples from 30 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 2019.

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.

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 247 +/- 127 pCi/L to 507 +/- 137 pCi/L. Tritium was not detected in any surface water samples.

Gross Alpha and Gross Beta analyses in the dissolved and suspended fractions were performed on groundwater samples during the third quarter of sampling in 2019. Gross Alpha (dissolved) was not detected at any of the groundwater locations. Gross Alpha (suspended) was detected in one of the seventeen groundwater locations at a concentration of 10 +/- 1.9 pCi/L. Gross Beta (dissolved) was detected in eleven of seventeen groundwater locations. The concentrations ranged from 1.6 to 6.8 pCi/L. Gross Beta (suspended) was detected in three of seventeen groundwater locations. The concentrations ranged from 2.0 to 9.7 pCi/L.

Hard-to-Detect analyses were performed on three groundwater locations. The analyses included lron-55 (Fe-55), Nickel-63 (Ni-63), Americium-241 (Am-241 ),

Cerium-242 (Cm-242), Cerium-243/244 (Cm-243/244), Plutonium-238 (Pu-238),

Plutonium-239/240 (Pu-239/240), Uranium-234 (U-234), Uranium-235 (U-235) and Uranium-238 (U-238). U-234 and U-238 were detected at one location with concentrations of 0.29 +/- 0.14 pCi/L and 0.25 +/- 0.13 pCi/L respectively. All other hard-to-detect nuclides analyzed were not found at concentrations greater than their respective MDCs.

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 2019.

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 radioac~ive 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 2019. In order to achieve the stated objectives, the current program includes the following analyses:

1. Concentrations of gamma emitters in groundwater and surface water

2. Concentrations of strontium in groundwater

3. Concentrations of tritium in groundwater, surface water and precipitation samples

4. Concentrations of gross alpha and gross beta in groundwater

5. Concentrations of Am-241 in groundwater

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

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

8. Concentrations of U-234, U-235 and U-238 in groundwater

9. Concentrations of Fe-55 in groundwater

10. Concentrations of Ni-63 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 2019.

2. Missed Samples There were no missed samples in 2019.

B. Program Changes During 2019, monitoring well MW-CL-131 was conservatively changed from a detection well to an elevated well per Station procedures.

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 507 pCi/1. (Table B-1.1 Appendix B)

Strontium Sr-89 was not detected in any of the seventeen samples analyzed and the required LLD of 10 pCi/L was met. Sr-90 was also not detected in any of the seventeen samples analyzed and the required LLD of 1 pCi/L was met. (Table B-1.1 Appendix B)

Gross Alpha and Gross Beta (dissolved and suspended)

Gross Alpha and Gross Beta analyses in the dissolved and suspended fractions were performed on groundwater samples during the third quarter of sampling in 2019. Gross Alpha (dissolved) was not detected at any of the groundwater locations. Gross Alpha (suspended) was detected in one of seventeen groundwater locations at a concentration of 10 +/- 1.9 pCi/L pCi/L. Gross Beta (dissolved) was detected in eleven of seventeen groundwater locations. The concentrations ranged from 1.6 to 6.8 pCi/L.

Gross Beta (suspended) was detected in three of the groundwater locations. The concentrations ranged from 2.0 to 9.7 pCi/L.

(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 performed on two groundwater locations to establish background levels. The analyses included Fe-55, Ni-63, Am- 241, Cm-242, Cm-243/244, Pu-238, Pu-239/240, U-234, U-235, and U-238. One sample detected U-234 and U-238. Occasionally, the isotopes of U-234 and U-238 are detected at low levels and indistinguishable from background. All other hard-to-detect nuclides were not detected at concentrations greater than their respective MDCs.

(Table B-1.3 Appendix B)

D. Surface Water Results Surface Water Baseline samples were collected from on-site surface waters during four (4) phases at the station. Analytical results are discussed below. No anomalies were noted during the year.

Tritium Samples from six locations were analyzed for tritium activity. Tritium was not detected at concentrations greater than the LLD.

(Table B-11.1 Appendix B)

Gamma Emitters No plant-produced radionuclides were detected.

(Table B-11.2, Appendix B)

E. Precipitation Water Results (Recapture)

Precipitation water samples from 7 locations were analyzed for tritium activity. Tritium was detected in two samples with concentrations ranging from 187 to 574 pCi/L. (Table B-111.1, Appendix B)

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

G. Errata Data There was no Errata Data for 2019.

H. Leaks, Spills, and Releases There were no leaks, spills or releases in 2019.

I. Trends No trends have been identified in 2019.

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 2019.

2. Installation of Monitoring Wells No new wells were installed during the 2019.

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

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, 2019 Site Site Type B-3 Monitoring Well MW-CL-1 Monitoring Well MW-CL-2 Monitoring Well MW-CL-121 Monitoring Well MW-CL-131 Monitoring Well MW-CL-13S Monitoring Well MW-CL-14S Monitoring Well MW-CL-151 Monitoring Well MW-CL-15S Monitoring Well MW-CL-16S Monitoring Well MW-CL-17S Monitoring Well MW-CL-181 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 SW-CL-1 Surface Water SW-CL-2 Surface Water SW-CL-4 Surface Water SW-CL-5 Surface Water SW-CL-6 Surface Water SW-CL-7 Surface Water RG-2 Precipitation Water RG-3 Precipitation Water RG-15 Precipitation Water RG-ENE Precipitation Water RG-N Precipitation Water RG-NNE Precipitation Water RG-NNW Precipitation Water RG-NW Precipitation Water RG-S Precipitation Water RG-WNW Precipitation Water A-1

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I N

Figure A-1 Onsite Sampling Locations at Clinton Power Station

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- - =:::::::11-200 c=::::i Feet FigureA-2 Sampling Locations South of Clinton Power Station

0 100 200 Feet Sam lin . Figure A - 3 P g Locations East of erinton Power Station

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

Intentionally left blank APPENDIX B DATA TABLES OF THE ANNUAL RADIOLOGICAL GROUNDWATER PROTECTION PROGRAM REPORT (ARGPPR)

Intentionally left blank TABLE 8-1.1 CONCENTRATIONS OF TRITIUM, STRONTIUM, GROSS ALPHA AND GROSS BETA IN GROUNDWATER SAMPLES COLLECTED IN THE VICINITY OF CLINTON POWER STATION, 2019 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION SITE DATE H-3 Sr-89 Sr-90 Gr-A (Dis) Gr-A (Sus) Gr-8 (Dis) Gr-8 (Sus) 8-3 02/27/19 < 190 8-3 05/22/19 < 198 8-3 08/21/19 < 193 < 7.0 < 0.7 < 0.5 < 1.0 < 2.0 < 1.7 8-3 12/04/19 < 183 MW-CL-1 02/27/19 < 190 MW-CL-1 05/22/19 < 192 MW-CL-1 08/21/19 < 191 < 7.9 < 0.8 < 0.8 < 1.0 1.6 +/- 0.9 < 1.7 MW-CL-1 12/04/19 < 183 MW-CL-2 02/27/19 < 189 MW-CL-2 05/22/19 < 192 MW-CL-2 08/21/19 < 190 < 7.1 < 1.0 < 0.5 < 1.0 < 2.0 < 1.7 MW-CL-2 12/04/19 < 182 MW-CL-121 02/27/19 < 196 MW-CL-121 05/22/19 < 197 MW-CL-121 08/21/19 < 193 < 6.8 < 0.8 < 1.3 < 1.1 2.5 +/- 1.3 < 1.7 MW-CL-121 12/04/19 < 184 MW-CL-131 02/27/19 < 194 MW-CL-131 05/23/19 < 195 MW-CL-131 08/22/19 < 193 < 5.3 < 0.8 < 1.0 < 1.0 2.8 +/- 1.0 < 1.7 MW-CL-131 12/05/19 < 185 MW-CL-13S 02/27/19 < 189 MW-CL-13S 05/23/19 < 192 MW-CL-13S 08/22/19 < 191 < 5.0 < 0.9 < 0.9 < 1.1 < 1.3 < 1.7 MW-CL-13S 12/05/19 < 182 MW-CL-14S 02/28/19 404 +/- 139 MW-CL-14S 05/23/19 < 192 MW-CL-14S 08/22/19 < 190 < 5.0 < 0.5 < 1.2 10 +/- 1.9 4.6 +/- 1.1 9.7 +/- 1.7 MW-CL-14S 12/05/19 507 +/- 137 MW-CL-151 02/27/19 < 188 MW-CL-151 05/22/19 < 190 MW-CL-151 08/21/19 < 190 < 7.0 < 0.9 < 0.9 < 1.2 < 1.4 < 1.8 MW-CL-151 12/04/19 < 186 MW-CL-15S 02/27/19 < 191 MW-CL-15S 05/22/19 < 189 MW-CL-15S 08/21/19 < 191 < 6.6 < 0.7 < 0.5 < 1.0 < 0.9 2.0 +/- 1.1 MW-CL-15S 12/04/19 < 186 MW-CL-16S 02/28/19 < 191 MW-CL-16S 05/23/19 < 190 MW-CL-16S 08/22/19 < 187 < 6.1 < 0.7 < 0.9 < 1.1 2.7 +/- 1.1 2.0 +/- 1.1 MW-CL-16S 12/05/19 < 188 MW-CL-17S 02/28/19 < 191 MW-CL-17S 05/23/19 < 184 MW-CL-17S 08/22/19 < 189 < 6.1 < 0.7 < 1.7 < 1.0 2.5 +/- 1.2 < 1.4 MW-CL-17S 12/05/19 < 186 MW-CL-181 02/28/19 < 195 MW-CL-181 05/23/19 < 190 MW-CL-181 08/22/19 < 191 < 6.8 < 0.9 < 0.9 < 1.0 2.4 +/- 0.9 < 1.4 MW-CL-181 12/05/19 < 187 MW-CL-18S 02/28/19 < 197 B-1

TABLE B-1.1 CONCENTRATIONS OF TRITIUM, STRONTIUM, GROSS ALPHA AND GROSS BETA IN GROUNDWATER SAMPLES COLLECTED IN THE VICINITY OF CLINTON POWER STATION, 2019 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION SITE DATE H-3 Sr-89 Sr-90 Gr-A (Dis) Gr-A (Sus) Gr-B (Dis) Gr-B (Sus)

MW-CL-18S 05/23/19 < 190 MW-CL-18S 08/22/19 < 190 < 7.3 < 0.9 < 1.1 < 1.0 3.8 +/- 1.1 < 1.4 MW-CL-18S 12/05/19 < 185 MW-CL-19S 02/27/19 < 191 MW-CL-19S 05/22/19 < 187 MW-CL-19S 08/21/19 < 194 < 5.3 < 0.6 < 2.1 < 1.1 3.9 +/- 1.3 < 1.5 MW-CL-19S 12/04/19 < 189 MW-CL-20S 02/27/19 < 194 MW-CL-20S 05/22/19 < 187 MW-CL-20S 08/21/19 < 192 < 4.9 < 1.0 < 1.1 < 1.0 2.8 +/- 1.1 < 1.4 MW-CL-20S 12/04/19 < 183 MW-CL-21S 02/27/19 < 194 MW-CL-21S 05/22/19 247 +/- 127 MW-CL-21S 08/21/19 < 192 < 4.9 < 0.9 < 0.9 < 1.0 < 1.4 < 1.4 MW-CL-21S 12/04/19 < 184 MW-CL-22S 02/28/19 < 198 MW-CL-22S 05/23/19 < 191 MW-CL-22S 08/22/19 < 191 < 5.6 < 0.6 < 1.1 < 1.0 6.8 +/- 1.2 < 1.4 MW-CL-22S 12/05/19 < 184 B-2

Table 8-1.2 CONCENTRATIONS OF GAMMA EMITTERS IN GROUNDWATER SAMPLES COLLECTED IN THE VICINITY OF CLINTON POWER STATION, 2019 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 08/21/19 < 58 < 114 < 6 < 5 < 18 < 8 < 13 < 7 < 15 < 6 <7 < 31 <9 MW-CL-1 08/21/19 < 66 < 172 < 8 < 6 < 15 < 5 < 16 < 8 < 11 <8 <7 < 31 < 10 MW-CL-2 08/21/19 < 42 < 92 <4 < 5 < 9 < 5 < 10 < 5 < 8 < 5 < 5 < 25 < 9 MW-CL-121 08/21/19 < 50 < 109 < 5 <4 < 9 < 5 < 11 < 6 < 9 < 5 < 7 < 35 < 13 MW-CL-131 08/22/19 < 65 < 75 <7 < 8 < 17 < 8 < 18 < 7 < 15 < 7 < 8 < 46 < 14 MW-CL-13S 05/23/19 < 68 < 106 < 6 < 7 < 15 < 8 < 16 < 6 < 10 < 8 < 8 < 40 < 8 MW-CL-13S 08/22/19 < 45 < 55 < 5 < 6 < 14 < 7 < 12 < 6 < 8 <7 < 6 < 26 < 12 MW-CL-14S 02/28/19 < 57 < 96 < 6 < 6 < 13 < 7 < 11 < 9 < 12 < 9 < 7 < 36 < 8 MW-CL-14S 08/22/19 < 63 < 131 < 7 < 7 < 15 < 8 < 12 < 6 < 11 < 8 < 7 < 30 < 11 MW-CL-151 08/21/19 < 68 < 120 < 9 < 7 < 14 < 6 < 13 < 6 < 13 < 7 < 7 < 26 < 9 MW-CL-15S 08/21/19 < 45 < 115 < 5 < 6 < 11 <5 < 7 < 5 < 9 < 6 < 5 < 25 < 9 MW-CL-16S 08/22/19 < 50 < 87 < 6 < 6 < 10 < 5 < 10 < 6 < 9 < 6 < 5 < 29 < 13 MW-CL-17S 08/22/19 < 57 < 118 < 6 < 6 < 12 <7 < 16 < 9 < 9 < 5 < 7 < 34 < 9 CJ I

c.> MW-CL-181 08/22/19 < 47 < 125 < 6 < 7 < 13 <8 < 12 < 6 < 10 < 6 < 8 < 33 < 9 MW-CL-18S 08/22/19 < 54 < 97 < 6 < 6 < 10 < 6 < 12 < 6 < 8 < 8 < 7 < 26 < 9 MW-CL-19S 08/21/19 < 39 < 48 < 5 < 5 < 10 <4 < 9 < 4 < 7 <4 < 3 < 25 < 7 MW-CL-20S 08/21/19 < 47 < 128 < 6 < 7 < 13 < 6 < 12 < 7 < 10 <7 < 7 < 30 < 11 MW-CL-21S 02/27/19 < 50 < 63 < 7 < 5 < 12 <7 < 14 < 5 < 14 < 8 < 7 < 26 < 13 MW-CL-21S 08/21/19 < 69 < 131 < 7 < 8 < 15 < 8 < 16 < 7 < 12 < 7 < 8 < 39 < 12 MW-CL-22S 08/22/19 < 58 < 130 < 8 < 7 < 13 < 9 < 15 < 9 < 12 < 9 < 8 < 30 < 11

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_J

TABLE B-1.3 CONCENTRATIONS OF HARD TO DETECTS IN GROUNDWATER SAMPLES COLLECTED IN THE VICINITY OF CLINTON POWER STATION, 2019 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION SITE DATE Am-241 Cm-242 Cm-243/244 Pu-238 Pu-239/240 U-234 U-235 U-238 Fe-55 Ni-63 MW-CL-13S 08/22/19 < 0.08 < 0.03 < 0.06 < 0.08 < 0.17 < 0.11 < 0.03 < 0.11 < 55 < 4.7 MW-CL-14S 08/22/19 < 0.04 < 0.02 < 0.02 < 0.16 < 0.16 0.29 +/- 0.14 < 0.05 0.25 +/- 0.13 < 90 < 4.7 MW-CL-21S 08/21/19 < 0.03 < 0.02 < 0.02 < 0.07 < 0.14 < 0.12 < 0.07 < 0.09 < 61 < 4.0

TABLE B-11.1 CONCENTRATIONS OF TRITIUM IN SURFACE WATER SAMPLES COLLECTED IN THE VICINITY OF CLINTON POWER STATION, 2019 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION SITE DATE H-3 SW-CL-1 02/27/19 < 197 SW-CL-1 05/22/19 < 190 SW-CL-1 08/21/19 < 190 SW-CL-1 12/04/19 < 187 SW-CL-2 02/27/19 < 198 SW-CL-2 05/22/19 < 190 SW-CL-2 08/21/19 < 191 SW-CL-2 12/04/19 < 188 SW-CL-4 02/27/19 < 190 SW-CL-4 05/22/19 < 184 SW-CL-4 08/21/19 < 190 SW-CL-4 12/04/19 < 184 SW-CL-5 02/27/19 < 195 SW-CL-5 05/22/19 < 185 SW-CL-5 08/21/19 < 195 SW-CL-5 12/04/19 < 188 SW-CL-6 02/27/19 < 191 SW-CL-6 05/22/19 < 185 SW-CL-6 08/21/19 < 195 SW-CL-6 12/04/19 < 183 SW-CL-7 02/27/19 < 192 SW-CL-7 05/22/19 < 185 SW-CL-7 08/21/19 < 199 SW-CL-7 12/04/19 < 184 B-5

Table B-11.2 CONCENTRATIONS OF GAMMA EMITTERS IN SURFACE WATER SAMPLES COLLECTED IN THE VICINITY OF CLINTON POWER STATION, 2019 RESULTS IN UNITS OF PC I/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 SW-CL-1 08/21/19 < 44 < 97 <4 <5 < 10 <5 < 10 <4 < 7 < 6 < 6 < 25 <8 SW-CL-2 08/21/19 < 61 < 89 < 6 <7 < 12 < 6 < 12 < 7 < 11 < 7 < 6 < 39 < 15 SW-CL-4 08/21/19 < 80 < 121 < 8 <9 < 18 < 8 < 21 < 8 < 15 < 10 < 9 < 41 < 13 SW-CL-5 08/21/19 < 59 < 135 < 6 <4 < 18 < 9 < 14 < 8 < 9 < 10 <7 < 39 < 12 SW-CL-6 08/21/19 < 56 < 60 < 7 < 7 < 12 < 8 < 10 < 8 < 10 < 6 < 7 < 33 < 12 SW-CL-7 08/21/19 < 55 < 111 < 6 <4 < 14 <5 <8 < 5 < 10 < 7 < 6 < 28 < 8 c:,

I C'l

l TABLE B-111.1 CONCENTRATIONS OF TRITIUM IN PRECIPITATION WATER SAMPLES COLLECTED IN THE VICINITY OF CLINTON POWER STATION, 2019 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION SITE DATE H-3 RG-ENE 12/18/19 574 +/- 140 RG-ESE 12/18/19 187 +/- 121 RG-N 12/18/19 < 184 RG-NNW 12/18/19 < 184 RG-S 12/18/19 < 185 RG-SE 12/18/19 < 182 RG-WNW 12/18/19 < 184 B-7

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