Text

Annual Radiological Environmental Operating Report
	ML19119A160
Person / Time
Site:	Clinton
Issue date:	04/30/2019
From:	; Exelon Generation Co, Teledyne Brown Engineering Environmental Services
To:	; Office of Nuclear Reactor Regulation
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ML19199A164	List: U-604487, Annual Radiological Environmental Operating Report;
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	Download: ML19119A160 (119)
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~, Exelon Generation January 01, 2018 - December 31, 2018 ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT CLINTON POWER STATION - DOCKET NUMBER 50-461 Prepared by:

Teledyne Brown Engineering Environmental Services April 2019 L

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 ............................................................................................... 1O A. Aquatic Environment ......................................................................................... 1O

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 ................................................................................................................... 18 I

Appendices Appendix A Radiological Environmental Monitoring Report Summary Tables Table A-1 Radiological Environmental Monitoring Program Annual Summary for the Clinton Power Station, 2018 Appendix B Location Designation, Distance & Direction, and Sample Collection &

Analytical Methods Tables Table B-1 Radiological Environmental Monitoring Program - Sampling Locations, Distance and Direction, Clinton Power Station, 2018

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Table B-2 Radiological Environmental Monitoring Program - Summary of Sample Collection and Analytical Methods, Clinton Power Station, 2018 Figures Figure B-1 Environmental Sampling Locations Within One Mile of the Clinton Power Station, 2018 Figure B-2 Environmental Sampling Locations Between One and Two Miles from the Clinton Power Station, 2018 Figure B-3 Environmental Sampling Locations Between Two and Five Miles from the Clinton Power Station, 2018 Figure B-4 Environmental Sampling Locations Greater Than Five Miles from the Clinton Power Station, 2018 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, 2018 Table C-1.2 Concentrations of Tritium in Surface Water Samples Collected in the Vicinity of Clinton Power Station, 2018 Table C-1.3 Concentrations of Gamma Emitters in Surface Water Samples -

Collected in the Vicinity of Clinton Power Station, 2018 Table C-11.1 Concentrations of Gross Beta in Drinking Water Samples Collected in the Vicinity of Clinton Power Station, 2018 ii

Table C-11.2 Concentrations of Tritium in Drinking Water Samples Collected in the Vicinity of Clinton Power Station, 2018 Table C-11.3 Concentrations of 1-131 in Drinking Water Samples Collected in the Vicinity of Clinton Power Station, 2018 Table C-11.4 Concentrations of Gamma Emitters in Drinking Water Samples Collected in the Vicinity of Clinton Power Station, 2018 Table C-111.1 Concentrations of Tritium in Well Water Samples Collected in the Vicinity of Clinton Power Station, 2018 Table C-111.2 Concentrations of Gamma Emitters in Well Water Samples Collected in the Vicinity of Clinton Power Station, 2018 Table C-IV.1 Concentrations of Gamma Emitters in Fish Samples Collected in the Vicinity of Clinton Power Station, 2018 Table C-V.1 Concentrations of Gamma Emitters in Sediment Samples Collected in the Vicinity of Clinton Power Station, 2018 Table C-Vl.1 Concentrations of Gross Beta in Air Particulate Samples Collected in the Vicinity of Clinton Power Station, 2018 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, 2018 Table C-Vl.3 Concentrations of Gamma Emitters in Air Particulate Samples Collected in the Vicinity of Clinton Power Station, 2018.

Table C-Vll.1 Concentrations of 1-131 in Air Iodine Samples Collected in the Vicinity of Clinton Power Station, 2018 Table C-Vlll.1 Concentrations of 1-131 in Milk Samples Collected in the Vicinity of Clinton Power Station, 2018 Table C-Vlll.2 Concentrations of Gamma Emitters in Milk Samples Collected in the Vicinity of Clinton Power Station, 2018 Table C-IX.1 Concentrations of Gamma Emitters in Vegetation Samples Collected in the Vicinity of Clinton Power Station, 2018 Table C-IX.2 Concentrations of Gamma Emitters in Grass Samples Collected in the Vicinity of Clinton Power Station, 2018 Table C-X.1 Quarterly DLR Results for Clinton Power Station, 2018 Table C-X.2 Mean Quarterly DLR Results for the Inner Ring, Outer Ring, Special Interest, Supplemental and Control Locations for Clinton Power Station, 2018 Table C-X.3 Summary of the Ambient Dosimetry Program for Clinton Power Station, 2018 iii

Figures Figure C-1 Mean Monthly Gross Beta Concentrations in Air Particulate Samples Collected in the Vicinity of CPS, 2018 Figure C-2 Mean Quarterly Ambient Gamma Radiation Levels (DLR) in the Vicinity of CPS, 2018 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

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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, 2018 through December 31, 2018.

During that time period, 1,552 analyses were performed on 1,425 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 2018. 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 2018 due to the release of gaseous effluents from CPS was 4.69E-02 or 0.0469 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 1

or shoreline sedimen t 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 (TSE) and Landauer on samples collected during the period January 1, 2018 through December 31, 2018.

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) to obtain environmental samples for the CPS REMP in 2018. 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-70 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, crappie, carp, bluegill, and channel catfish, the species most commonly harvested from the lakes by sporting fishermen, were collected semiannually at two locations, CL-19 and CL-105. CL-105 was the control location, which is located about 50 miles upwind of the station. Shoreline sediment samples composed of recently deposited substrate were collected at two locations semiannually (CL-07B and CL-105 (control)).

Atmospheric Environment The atmospheric environment was evaluated by performing radiological analyses on samples of air particulate, airborne iodine, milk, food produce and grass. Airborne iodine and particulate samples were collected and analyzed weekly 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

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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 TSE and Environmental Inc. (Midwest Labs) to analyze the environmental samples for radioactivity for the CPS REMP in 2018. 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 b~coming 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 4096676 Non-ODCM CL-1 Timer Shortage 01/24/2018-During the weekly particulate and iodine sampling activities on 1/24/2018, the REMP sample collection vendor Environmental Inc. found non-ODCM air sampler CL-1 with a timer reading shortage of approximately 2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months ,-This indicates a power outage at some point during the sampling week. The sampler was back up and running as expected. The sample is sufficient for analysis.

2. IR 4104312 ODCM Air Samplers CL-7, CL-8 1 CL-15 & CL-94 Timer Shortages 02/14/2018-During the weekly airborne iodine and particulate surveillance performed on 2/14/2018, the sampling vendor Environmental, Inc. found two ODCM air samplers CL-8 and CL-15 and two non-ODCM air samplers CL-7 and CL-94 with timer reading shortages indicating a power outage during the collection week. The timers were all back up and running appropriately. The samples are sufficient for analysis, but the sample collections were not continuous as required by the ODCM.

3. IR 4112366 ODCM Environmental Area TLD's CL-35 Missing Clinton's ODCM Table 4.6-1 (1) requires Direct Radiation Monitoring at both inner and outer rings surrounding Clinton Power Station.

Within these requirements, specific reference is made to having monitoring capabilities at CL-35, a location in the Northwest Inner Ring Meteorological Sector, located 0.7 miles from the centerline of our Station HVAC Stack. This Environmental Area TLDs are exchanged quarterly per the ODCM Table, but weekly verifications are performed to ensure we are capturing the direct radiation throughout the quarter.

Contrary to the above requirement, our ODCM Sample Collector Vendor reported that during the verification of ODCM REMP TLDs under WO 4752566, the two TLDs located at CL-35 were missing.

The vendor was able to replace these two TLDs with the spares that are kept in a lead shielded box prior to/if use is required throughout the quarter.

4. IR 4125532 ODCM Air Samplers CL-3, CL-4 & CL-6 Timer Shortages 04/11 /2018-During the weekly ODCM air sampling surveillance on Wednesday 4/11/2018, the Environmental Inc. sampling vendor identified that one ODCM air sample location, CL-3, and two non-ODCM sample locations, CL-4 and CL-6, timers were short approximately 4 to 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months . The samplers and timers were back up and running as expected. This indicates a power outage at some point during the sampling week. The samples are sufficient for analysis, but the sample collections were not continuous as required by the ODCM.

5. IR 4128517 ODCM Water Compositor CL-91 Sample Line or Header Clogged 04/18/2018-During the routine weekly compositor check performed on 4/18/2018, the sampling vendor, Environmental Inc. found ODCM upstream surface water compositor CL-91 unable to obtain a sample due to an apparent blockage in the sample line extending into Clinton Lake. Troubleshooting of the compositor indicates that the compositor itself and the heat trace are functioning as expected, however, no air could be forced backwards through the sampling line extending into the lake. Once the header and sample line were cleared, the compositor was functioning as normal.

6. IR 4138861 ODCM & Non-ODCM Air Samplers Timer Shortages 05/16/2018- During the weekly ODCM air sampling surveillance on Wednesday 05/16/2018, the Environmental Inc. sampling vendor identified that all the timers besides CL-1 and CL-11 were short indicating power outages at some point during the sampling week.

Significant storms went through the area during the week, which could have potentially caused these outages. Every sampler and timer were back up and running as expected. The samples are sufficient for analysis, but the sample collections were not continuous as required by the ODCM.

7. IR 4151028 ODCM Insufficient Vegetation for the June 2018 REMP Sampling 06/27/2018- During the vegetation sampling on 06/27/2018, the vendor collector could not obtain enough vegetation samples for the June 2018 monthly sample at CL-115 and CL-118. Nearby broadleaf weeds and corn leaves were collected as a substitute samples.

8. IR 4158990 ODCM Insufficient Vegetation for the July 2018 REMP Sampling 07/25/2018- During the vegetation sampling on 07/25/2018, the vendor collector could not obtain enough vegetation samples for the July 2018 monthly sample at CL-115 and CL-118. Nearby broadleaf weeds and corn leaves were collected as a substitute samples.

9. IR 4168514 ODCM Insufficient Vegetation for the August 2018 REMP Sampling 08/29/2018- During the vegetation sampling on 08/29/2018 under the WO 4811564, the vendor collector could not obtain enough vegetation samples for the August 2018 monthly sample at CL-114, CL-115 and CL-118. Three types of broadleaf vegetation were appropriately obtained from CL-117. CL-114, the control garden located in approximately 12.5 miles SSE of CPS, only had cabbage available for sampling. Nearby broad leaf weeds and corn leaves were collected as a substitute samples for CL-115 and CL-118.

10. IR 4177596 ODCM Insufficient Vegetation for the September 2018 REMP Sampling 09/27/2018- During the vegetation sampling on 09/27/2018 under the WO 4824687, the vendor collector could not obtain enough vegetation samples for the September 2018 monthly sample at CL-114, CL-115 and CL-118. The remaining cabbage and some week substitutes were collected at CL-114, while nearby corn leaves were collected as a substitute CL-115 sample and nearby broad leaf weeds were collected as a substitute CL-118 sample

11. IR 4194818 Non-ODCM Heater at Water Compositor CL-99 Not Functioning 11/14/2018- During the weekly compositor check performed on 11/14/2018, the sampling vendor from Environmental Inc. found that the non-ODCM water compositor CL-99 was without heat. The compositor and sampler are frozen due to the heater being out of service, therefore not allowing the 20 ml per hour aliquot sample to be collected until fixed. Once the heater was fixed, the compositor was functioning as normal, but grab samples were taken on 12/5/18 and 12/12/18 to make up for the loss composite time.

Throughout 2018, the following IRs were generated to document Program exceptions that .were entered into the corrective action program for trending purposes.

Missed Samples

1. IR 4090070 No Samples Obtained at CL-90 and CL-99 During the weekly compositor checks and sample collection performed during the month of January, th.e sampling vendor from Environmental Inc. found that the ODCM required sampling point CL-90 was without heat and non-ODCM sample point CL-99 was frozen.

No representative grab samples were able to be obtained on either compositor due to the frozen water intake areas.

2. IR 4163281 REMP Weekly Air Particulate and Iodine Cartridges Missing 07/25/2018- Notified by Teledyne Brown Engineering and Environmental Inc. that the weekly air particulate and iodine cartridges collected on 7/25/18 under WO 04809207 were lost by FedEx. The Environmental Inc. Sampling Vendor shipped the cartridges and other samples (such as vegetation, surface water, etc.)

collected on 7/25/18 via FedEx on 7/26/18, but the cartridges never arrived at Teledyne Brown as of 8/10/18. The other samples collected on 7/25/18 appropriately arrived at Teledyne Brown.

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 2018.

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 (Table C-111.1, 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-111.2, Appendix C). No plant-produced radionuclides were detected and all required LLDs were met.

4. Fish Fish samples comprised of bluegill, carp, crappie, channel catfish, and largemouth 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 (Table C-IV.1, Appendix C).

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

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 (Table C-V.1, Appendix C). No plant-produced radionuclides were detected and all required LLDs were met.

B. Atmospheric Environment

1. Airborne *

a. Air Particulates Continuous air particulate samples were collected from 10 locations on a weekly basis. The 1O locations were separated into three groups: Group I represents loc~tions 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 9 to 36 E-3 pCi/m 3 with a mean of 18 E-3 pCi/m 3 . The results from the Intermediate Distance location (Group II) ranged from 9 to 35 E-3 pCi/m 3 with a mean of 18 E-3 pCi/m 3 . The results from the Control locations (Group Ill) ranged from 6 to 31 E-3 pCi/m 3 with a mean of 17 E-3 pCi/m 3

Comparison of the 2018 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 2018 indicate no notable differences among the three groups.

Gamma Spectrometry Weekly samples were composited quarterly and analyzed for gamma-emitting nuclides (Table C-Vl.3, Appendix C).

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

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 (Table C-Vll.1, Appendix C). All results were less than the MDC and the required LLD was met.

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

Gamma Spectrometry Each milk sample was analyzed for concentrations of gamma-emitting nuclides (Table C-Vlll.2, Appendix C).

Naturally-occurring K-40 activity was found in all samples.

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

b. Food Pro.ducts Broadleaf vegetation samples were collected from four locations (CL-114, CL-115, CL-117 and CL-1'18) monthly June through September to coincide with the harvest season. The following analysis was performed:

Gamma Spectrometry Each food product sample was analyzed for concentrations of gamma-emitting nuclides (Table C-IX.1, Appendix C). No plant-produced radionuclides were detected and all required LLDs were met.

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 (Table C-IX.2, Appendix C). No plant-produced radionuclides were detected and all required LLDs were met.

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 215 OS LO measurements were made in 2018. The average dose from the inner ring was 19.1 mRem/quarter. The average dose from the outer ring was 19.2 mRem/quarter. The average dose from the special interest group was 18. 7 mRem/quarter. The average dose from the supplemental group was 17.7 mRem/quarter. The quarterly measurements ranged from 14.6 to 24.9 mRem/quarter.

The inner ring and outer ring measurements compared well to the Control Station, CL-11, which ranged from 16.6 mRem/quarter to 17.6 mRem/quarter with an average measurement of 17 .2 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 Tables C-X.1 to C-X.3, Appendix C.

E. Land Use Survey The Annual Land Use Survey conducted during the growing season around the Clinton Power Station (CPS) was performed by Environmental Inc. (Midwest Labs) for Exelon to comply with Clinton's Offsite Dose Calculation Manual, section 8.0. The report to CPS was dated October, 10, 2018. The purpose of the survey was to document the nearest resident, milk-producing animal and garden of greater than 50 m2 in each of the sixteen 22 % 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 1.5 >8 3 NE 2.1 3.5 >8 4 ENE 2.9 4.2 4.2 5 E 1.7 1.7 >8 6 ESE 5.1 5.3 >8 7 SE 4.4 7.8 7.2 8 SSE 2.9 >8 >8 9 S 4.8 6.6 6.6 10SSW 4.7 >8 6.3 11 SW 1.2 >8 >8 12WSW 3.6 4.3 4.3 13W 2.0 3.2 >8 14WNW 2.6 2.6 >8 15NW 2.7 >8 >8 16NNW 2.1 2.1 2.1 F. Errata Data There was no errata data for 2018.

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

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

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

8. 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, 166 out of 172 analyses performed met the specified acceptance criteria. Six analyses did not meet the specified acceptance criteria for the following reasons and were addressed through the TBE Corrective Action Program.

1. TBE was unable to report the February 2018 DOE MAPEP vegetation Sr-90 result due to QC failure and limited sample amount. (NCR 18-09)

2. The Analytics September 2018 milk Fe-59 result was evaluated as Not Acceptable (Ratio of TBE to known result at 132%). The reported value was 158 +/- 17.6 pCi/L and the known value was 119

+/- 19.9 pCi/L. No cause for the failure could be determined. TBE has passed 24 of the previous 27 milk cross-check results since 2012. This sample was run in duplicate on a different detector with comparable results (162 +/- 16 pCi/L). NOTE: TBE's 4h Qtr result passed at 105% (NCR 18-20)

3. The Analytics September milk 1-131 result was evaluated as Not Acceptable (Ratio of TBE to known result at 143%). Due to a personnel change in the gamma prep lab, the sample was not prepped/counted in a timely manner such as to accommodate the 1-131 8-day half-life. Analysts have been made aware of the urgency for this analysis and it will be monitored more closely by QA. NOTE: TBE's 4h Qtr result passed at 101% (NCR 18-24)

4. The Analytics September soil Cr-51 result was evaluated as Not Acceptable (Ratio of TSE to known result at 131 %). As with #3 above, the sample was not prepped/counted in a timely manner such as to accommodate the Cr-51 27-day half-life. The same corrective action applies here as in #3. (NCR 18-21)

5. The MAPEP November vegetation Sr-90 result of 0.338 Sq/sample was evaluated as Not Acceptable -(Lower acceptable range was 0.554 Sq/sample). It appears that there has been incomplete dissolution of Sr-90 due to the composition of the MAPEP vegetation "matrix". To resolve this issue, the TSE-2018 procedure has been modified to add H202 to assist in breaking down the organic material that comprises this "matrix". This corrective action will be monitored closely by QA. (NCR 18-25).

6. The ERA October 2018 water Sr-90 sample was evaluated as Not Acceptable. TSE's initial reported result of 36.8 pCi/L exceeded the upper acceptance range (22.9 - 36.4 pCi/L). After reviewing the data for this sample, it was discovered that there was a typographical error at the time the results were entered at the ERA website. The correct result in LIMS of 36.2 should have been submitted instead. This result is within ERA's acceptance limits. In addition to the typo error, ERA's very stringent upper acceptance limit of 116% is not a reflection of TS E's ability to successfully perform this analysis. (NCR 18-23)

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

,J 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.

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APPENDIX A*

RADIOLOGICAL ENVIRONMENTAL MONITORING REPORT

SUMMARY

I_

Intentionally left blank J

TABLE A-1 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANNUAL

SUMMARY

FOR THE CLINTON POWER STATION, 2018 NAME OF FACILITY: CLINTON POWER STATION DOCKET NUMBER: 50-461 LOCATION OF FACILITY: DEWITT COUNTY IL REPORTING PERIOD: 2018 INDICATOR CONTROL LOCATION WITH HIGHEST ANNUAL MEAN (M)

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

..I, CS-134 15 <LLD <LLD 0 CS-137 18 <LLD <LLD 0 BA-140 60 <LLD <LLD 0 LA-140 15 <LLD <LLD 0 CE-144 NA <LLD <LLD 0 DRINKING WATER GR-8 12 4 . <LLD NA 0 (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, 2018 NAME OF FACILITY: CLINTON POWER STATION DOCKET NUMBER: 50-461 LOCATION OF FACILITY: DEWITT COUNTY IL REPORTING PERIOD: 2018 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 WELL WATER H-3 12 2000 <LLD NA 0 (PCIA.ITER)

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 N

I 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, 2018 NAME OF FACILITY: CLINTON POWER STATION DOCKET NUMBER: 50-461 LOCATION OF FACILITY: DEWITT COUNTY IL REPORTING PERIOD: 2018 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 (PCIIKG DRY) 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

w LA-140 NA <LLD <LLD 0 CE-144 NA <LLD <LLD 0 AIR PARTICULATE GR-B 510 10 18 17 18 CL-3 INDICATOR 0 (E-3 PC/ICU.METER) (459/459) (51/51) (51/51) CLINTON'S SECONDARY ACCESS ROAD (9/36) (6131) (9/34) 0.7 MILES NE 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 510 (E-3 PC/ICU.METER) 1-131 70 <LLD <LLD 0 (M) The Mean Values are calculated using the positive values. (F) Fraction of detectable measuremen'! are indicated in parentheses.

TABLE A-1 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANNUAL

SUMMARY

FOR THE CLINTON POWER STATION, 2018 NAME OF FACILITY: CLINTON POWER STATION DOCKET NUMBER: 50-461 LOCATION OF FACILITY: DEWITT COUNTY IL REPORTING PERIOD: 2018 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 (UN/TOF 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 o (PC/11./TER)

GAMMA 19 K-40 NA NA 1129 1129 CL-116 CONTROL o (19/19) (19/19) Dement Dairy (790/1333) (790/1333) 14 MILES WSW OF SITE MN-54 NA NA <LLD o C0-58 NA NA <LLD o FE-59 NA NA <LLD o C0-60 NA NA <LLD o J>

I ZN-65 NA NA <LLD o

~ NB-95 NA NA <LLD o ZR-95 NA NA <LLD o CS-134 15 NA <LLD o CS-137 18 NA <LLD o BA-140 60 NA <LLD o LA-140 15 NA <LLD o CE-144 NA NA <LLD o VEGETATION GAMMA 28 (PCIIKG WE7) MN-54 NA <LLD <LLD o C0-58 NA <LLD <LLD o FE-59 NA <LLD <LLD o C0-60 NA <LLD <LLD o ZN-65 NA <LLD <LLD o NB-95 NA <LLD <LLD o ZR-95 NA <LLD <LLD o 1-131 60 <LLD <LLD o CS-134 60 <LLD <LLD o CS-137 80 <LLD <LLD o BA-140 NA <LLD <LLD o LA-140 NA <LLD <LLD o CE-144 NA <LLD <LLD o (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, 2018 NAME OF FACILITY: CLINTON POWER STATION DOCKET NUMBER: 50-461 LOCATION OF FACILITY: DEWITT COUNTY IL REPORTING PERIOD: 2018 INDICATOR CONTROL LOCATION WITH HIGHEST ANNUAL MEAN (M)

MEDIUM OR REQUIRED LOCATIONS LOCATION NUMBER OF PATHWAY SAMPLED TYPES OF NUMBER OF LOWER LIMIT MEAN(M) MEAN (M) MEAN(M) STATION# NONROUTINE (UNITOF ANALYSIS ANALYSIS OF DETECTION (F) (F) (F) NAME REPORTED MEASUREMENT) PERFORMED PERFORMED (LLD) RANGE RANGE RANGE DISTANCE AND DIRECTION MEASUREMENTS GRASS GAMMA 52 (PCl!KG WE7J 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

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

CTI BA-140 NA <LLD <LLD 0 LA-140 NA <LLD <LLD 0 CE-144 NA <LLD <LLD 0 DIRECT RADIATION OSLD-QUARTERLY 215 NA 18.7 17.2 21.2 CL-43 INDICATOR 0 (MILL/-ROENTGENIQTR.) (211/211) (4/4) (4/4)

(14.6/24.9) (16.6/17.6) (19.7/24.9) 2.8 MILES SE (M) The Mean Values are calculated using the positive values. (F) Fraction of detectable measurement are indicated in parentheses.

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

Intentionally left blank

_J

TABLE 8-1: Radiological Environmental Monitoring Program - Sampling Locations, Distance and Direction Clinton Power Station, 2018 Location Location Description Distance & Direction From Site A. Surface Water CL-13 Salt Creek Bridge on Rt. 1O (indicator) 3.6 miles SW CL-90 Discharge Flume (indicator) 0.4 miles SE CL-91 Parnell Boat Access (control) 6.1 miles ENE*

CL-99 North Fork Access (control) 3.5 miles NNE

8. Drinking (Potable) Water CL-14 Station Plant Service Bldg (indicator) Onsite C. WellWater CL-7D Mascoutin Recreation Area (indicator) 2.3 miles ESE CL-12T DeWitt Pump House (indicator) 1.6 miles E CL-12R DeWitt Pump House (indicator) 1.6 miles E D. Milk - bi-weekly/ monthly CL-t16 Dement Dairy (control) 14 miles WSW E. Air Particulates/ Air Iodine CL-1 Camp Quest 1.8 miles W CL-2 Clinton's Main Access Road 0.7 miles NNE CL-3 Clinton's Secondary Access Road 0.7 miles NE CL-4 Residence Near Recreation Area 0.8 miles SW CL-6 Clinton's Recreation Area 0.7 miles WSW CL-7 Mascoutin Recreation Area 2.3 miles SE CL-8 DeWitt Cemetery 2.2 miles E CL-11 Illinois Power Substation (control) 16 miles S CL-15 Rt. 900N Residence 0.9 miles N CL-94 Old Clinton Road 0.6 miles E F. Fish CL-19 End of Discharge Flume (indicator) 3.4 miles E CL-105 Lake Shelbyville (control) 50 miles S G. Shoreline Sediment CL-78 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 B-1

TABLE B-1: Radiological Environmental Monitoring Program - Sampling Locations, Distance and Direction Clinton Power Station, 2018 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 0.7miles NW CL-36 0.6 miles N CL-42 2.8 miles ESE CL-43 2.8 miles SE CL-44 2.3 miles SSE CL-45 2.8 miles S CL-46 2.8miles SSW CL-47 3.3 miles SW CL-48 2.3milesWSW 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 4.5milesWSW CL-76 4.6 miles N CL-77 4.5 miles NNE CL-78 4.8 miles NE CL-79 4.5 miles ENE CL-80 4.1 miles W CL-81 4.5milesWNW Special Interest CL-37 3.4 miles N CL-41 2.4 miles E CL-49 3.5 milesW CL-64 2.1 miles WNW CL-65 2.6 miles ENE CL-74 1.9 miles W CL-75 0.9 miles N B-2

TABLE B-1: Radiological Environmental Monitoring Program - Sampling Locations, Distance and Direction Clinton Power Station, 2018 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 0.8milesWSW 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, 2018 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 liquid Surface Quarterly composite from a 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 liquid Drinking Quarterly composite from a scintillation Tritium Water continuous water compositor Env. Inc., SPM-1 Sampling Procedure Manual Drinking Monthly composite from a TBE, TBE-2031 Radioactive Iodine in Drinking Water 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 liquid Quarterly composite from a 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 techniaues Env. Inc., SPM-1 Sampling Procedure Manual TBE, TBE-2007 Gamma emitting radioisotope analysis Sediment Gamma Spectroscopy Semi-annual grab samples Env. Inc., GS-01 Determination of gamma emitters by gamma spectroscopy 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 B-4 J

TABLE B-2: Radiological Environmental Monitoring Program - Summary of Sample Collection and Analytical Methods, Clinton Power Station, 2018 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 Eriv. 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 Al203: C Landauer Landauer Incorporated Dosimetry Incorporated elements B-5

84

~94 CLJN'rON LAkE Figure B-1 Environmental Sampling Locations Within One Mile of the Clinton Power Station, 2018 B-6

Figure B-2 Environmental Sampling _Locations Between One and Two Miles of the Clinton Power Station, 2018 B-7

Figure 8-3 Environmental Sampling Locations between Two and Five Miles from the Clinton Power Station, 2018 8-8

~

N

~

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Figure B-4 Environmental Sampling Locations Greater Than Five Miles of the Clinton Power Station, 2018 B-9

Intentionally left blank J

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 CLINiON POWER STATION, 2018 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION PERIOD CL-90 01/10/18 - 01/31/18 < 0.4 01/31/18 - 02/28/18 < 0.3 02/28/18 - 03/28/18 < 0.7 03/28/18 - 04/25/18 < 0.6 04/25/18 - 05/30/18 < 0.8 05/30/18 - 06/27/18 < 0.6 06/27/18 - 07/25/18 < 0.5 07/25/18 - 08/29/18 < 0.8 08/29/18 - 09/26/18 < 0.5 09/26/18 - 10/31/18 < 0.6 10/31/18 - 11/28/18 < 1.0 11/28/18 - 12/26/18 < 0.6 MEAN Table C-1.2 CONCENTRATIONS OF TRITIUM IN SURFACE WATER SAMPLES COLLECTED IN THE VICINITY OF CLINTON POWER STATION, 2018 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION PERIOD CL-13 CL-90 CL-91 CL-99 12/27/17 - 03/28/18 < 187 < 191 < 188 < 184 04/25/18 - 06/27/18 < 192 < 196 < 196 < 192 07/25/18 - 09/26/18 < 191 < 190 < 194 < 195 10/31/18 - 12/26/18 < 189 < 191 < 192 < 189 MEAN C-1

Table C-1.3 CONCENTRATIONS OF GAMMA EMITTERS IN SURFACE WATER SAMPLES COLLECTED IN THE VICINITY OF CLINTON POWER STATION, 2018 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 01/31/18 - 01/31/18 < 6 <7 < 14 <5 < 10 <8 < 9 < 7 <7 < 28 < 8 < 45 02/28/18 - 02/28/18 < 8 < 8 < 18 <8 < 19 < 8 < 15 < 8 <8 < 34 < 14 < 45 03/28/18 - 03/28/18 < 9 < 10 < 21 < 10 < 21 < 10 < 16 < 8 < 8 < 37 < 14 < 53 04/25/18 - 04/25/18 < 6 < 8 < 15 < 8 < 16 <7 < 12 < 8 <8 < 33 < 10 < 51 05/30/18 - 05/30/18 < 3 <3 <7 <3 < 7 <3 < 5 < 3 <3 < 21 <7 < 22 '

06/27/18 - 06/27/18 <4 <4 < 8 <4 < 9 <4 <7 <4 <4 < 17 <5 < 30 07/25/18 - 07/25/18 < 7 <6 < 14 < 6 < 10 < 7 < 10 <7 <7 < 31 < 8 < 58 08/29/18 - 08/29/18 < 6 <6 < 9 < 5 < 13 < 8 < 11 <6 <5 < 27 < 11 < 49 09/26/18 - 09/26/18 < 7 <5 < 10 < 6 < 12 < 7 < 10 <8 <7 < 32 < 8 < 51 10/31/18 - 10/31/18 < 9 <8 < 14 <7 < 13 <7 < 12 < 10 <8 < 37 < 12 < 57 11/28/18 - 11/28/18 < 5 < 5 < 9 < 5 < 10 < 5 < 10 <6 <5 < 33 <7 < 36 12/26/18 - 12/26/18 < 6 <6 < 10 < 8 < 10 < 5 < 8 <5 <6 < 29 < 8 < 34 C) MEAN N

CL-90 01/10/18 - 01/31/18 (1) < 8 <6 < 10 <7 < 13 < 7 < 10 < 7 <7 < 28 <8 < 50 01/31/18 - 02/28/18 < 6 <6 < 13 < 8 < 9 < 7 < 11 < 9 <7 < 27 <9 < 45 02/28/18 - 03/28/18 < 8 <8 < 17 <7 < 18 < 8 < 13 < 11 < 10 < 41 < 15 < 51 03/28/18 - 04/25/18 <4 < 3 <7 < 5 <6 <4 <7 <4 <4 < 19 <7 < 29 04/25/18 - 05/30/18 < 3 <3 < 8 <4 <6 <4 <7 < 3 <3 < 20 <8 < 18 05/30/18 - 06/27/18 <4 <4 < 10 < 5 < 10 <4 < 7 <4 < 5 < 19 <5 < 32 06/27/18 - 07/25/18 < 8 <7 < 11 <7 < 12 < 6 < 12 < 9 <7 < 34 < 11 < 61 07/25/18 - 08/29/18 < 7 <7 < 15 < 8 < 15 < 9 < 14 < 8 <6 < 38 < 14 < 47 08/29/18 - 09/26/18 < 5 <6 < 16 < 6 < 16 < 8 < 11 <7 <7 < 31 < 14 < 50 09/26/18 - 10/31/18 <7 <4 < 12 <7 < 12 < 6 < 8 <7 < 6 < 26 < 12 < 40 10/31/18 - 11/28/18 <4 <5 < 11 <4 < 10 < 5 < 9 < 6 <5 < 34 < 14 < 37 11/28/18 - 12/26/18 < 7 <6 < 13 <7 < 12 < 7 < 10 <7 <7 < 35 < 12 < 37 MEAN (1) SEE PROGRAM EXCEPTIONS SECTION FOR EXPLANATION

Table C-1.3 CONCENTRATIONS OF GAMMA EMITTERS IN SURFACE WATER SAMPLES COLLECTED IN THE VICINITY OF CLINTON POWER STATION, 2018 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-91 12/27/17 - 01/13/18 < 5 <8 < 14 <8 < 14 < 8 < 14 <9 <7 < 37 < 14 < 64 01/31/18 - 02/28/18 < 6 <5 < 12 <5 < 10 < 5 <9 <6 <6 < 23 < 9 < 42 02/28/18 - 03/28/18 < 6 < 7 < 14 < 8 < 13 < 6 < 12 < 6 < 7 < 26 < 6 < 58 03/28/18 - 04/25/18 < 4 < 4 < 9 < 4 < 7 < 5 < 8 < 4 < 4 < 18 < 3 < 33 04/25/18 - 05/30/18 < 3 < 3 < 6 < 3 < 5 < 3 < 5 < 3 < 3 <.18 < 6 < 24 05/30/18 - 06/27/18 < 5 < 5 < 12 < 6 < 11 < 5 < 9 < 5 < 6 < 27 < 9 < 47 06/27/18 - 07/25/18 < 6 < 6 < 12 < 7 < 12 < 7 < 10 < 6 < 6 < 29 < 7 < 43 07/25/18 - 08/29/18 < 6 < 7 < 15 < 7 <-16 < 7 < 12 < 7 < 6 < 32 < 10 < 49 08/29/18 - 09/26/18 < 8 < 9 < 17 < 9 < 11 < 8 < 10 < 9 < 8 < 38 < 11 < 53 09/26/18 - 10/31/18 < 7 < 6 < 15 < 7 < 15 < 5 < 11 < 6 < 6 < 34 < 10 < 41 10/31/18 - 11/28/18 < 3 <5 <9 <5 <7 < 5 <7 <4 <5 < 28 < 8 < 36 11 /28/18 - 12/26/18 < 6 <7 < 15 <6 < 14 < 7 < 10 <8 <8 < 30 < 15 < 43

() MEAN w

CL-99 12/27/17 - 01/31/18 (1) 01/31/18 - 02/28/18 <8 <8 < 15 < 10 < 21 <8 < 15 <9 < 10 < 38 < 11 < 77 02/28/18 - 03/28/18 < 6 <8 < 22 <8 < 13 <5 < 14 <5 <9 < 35 < 11 < 55 03/28/18 - 04/25/18 <7 <6 < 16 <5 < 12 <6 <9 <7 <7 < 31 < 10 < 34 04/25/18 - 05/30/18 <2 <2 < 5 <2 <4 <3 <4 <3 <2 < 14 <5 < 18 05/30/18 - 06/27/18 <4 <5 < 8 <5 <9 <4 <8 <4 <4 < 18 <7 < 28 06/27/18 - 07/25/18 <8 <7 < 14 <8 < 18 <8 < 12 <7 <8 < 31 < 12 < 59 07/25/18 - 08/29/18 <6 <5 < 14 <6 < 11 <6 < 12 <7 <6 < 30 < 10 < 45 08/29/18 - 09/26/18 <3 <5 < 13 <6 < 12 <7 <9 <5 <5 < 31 < 10 < 36 09/26/18 - 10/31/18 <7 <8 < 18 <7 < 19 <8 < 13 <9 <8 < 40 <8 < 56 10/31/18 - 11/28/18 <4 <5 < 11 <5 <8 <5 <7 <5 <4 < 34 < 10 < 34 11/28/18 - 12/26/18 <5 <6 < 14 <7 < 11 <5 < 11 <7 <6 < 28 < 11 < 40 MEAN (1) SEE PROGRAM EXCEPTIONS SECTION FOR EXPLANATION

Table C-11.1 CONCENTRATIONS OF GROSS BETA IN DRINKING WATER SAMPLES COLLECTED IN THE VICINITY OF CLINTON POWER STATION, 2018 RESULTS IN UNITS OF PC I/LITER +/- 2 SIGMA COLLECTION PERIOD CL-14 12/27/17 - 01/31/18 < 1.6 01/31/18 - 02/28/18 < 1.8 02/28/18 - 03/28/18 < 1.9 03/28/18 - 04/25/18 < 1.5 04/25/18 - 05/30/18 < 1.6 05/30/18 - 06/27/18 < 1.6 06/27/18 - 07/25/18 < 1.6 07/25/18 - 08/29/18 < 1.6 08/29/18 - 09/26/18 < 1.3 09/26/18 - 10/31/18 < 1.6 10/31/18 - 11/28/18 < 1.7 11/28/18 - 12/26/18 < 1.6 MEAN Table C-11.2 CONCENTRATIONS OF TRITIUM IN DRINKING WATER SAMPLES COLLECTED IN THE VICINITY OF CLINTON POWER STATION, 2018 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION PERIOD CL-14 12/27/17 - 03/28/18 < 187 03/28/18 - 06/27/18 < 165 06/27/18 - 09/26/18 < 194 09/26/18 - 12/26/18 < 190 MEAN Table C-11.3 CONCENTRATIONS OF 1-131 IN DRINKING WATER SAMPLES COLLECTED IN THE VICINITY OF CLINTON POWER STATION, 2018 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION PERIOD CL-14 12/27/17 - 01/31/18 < 0.3 01 /31 /18 - 02/28/18 < 0.3 02/28/18 - 03/28/18 < 0.9 03/28/18 - 04/25/18 < 0.6 04/25/18 - 05/30/18 < 0.7 05/30/18 - 06/27/18 < 0.6 06/27/18 - 07/25/18 < 0.7 07/25/18 - 08/29/18 < 0.7 08/29/18 - 09/26/18 < 0.5 09/26/18 - 10/31/18 < 0.6 10/31/18 - 11/28/18 < 0.8 11 /28/18 - 12/26/18 < 0.6 MEAN C-4

Table C-11.4 CONCENTRATIONS OF GAMMA EMITTERS IN DRINKING WATER SAMPLES COLLECTED IN THE VICINITY OF CLINTON POWER STATION, 2018 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 12/27/17 - 01/31/18 < 8 < 9 < 19 < 6 < 14 <8 < 14 < 9 <8 < 29 < 14 < 50 01/31/18 - 02/28/18 < 7 < 8 < 14 < 9 < 17 <7 < 12 <8 < 8 < 34 < 14 < 52 02/28/18 - 03/28/18 < 8 < 7 < 15 < 9 < 14 < 8 < 14 < 9 < 8 < 29 < 12 < 61 03/28/18 - 04/25/18 <4 < 3 <7 <3 < 8 <5 < 6 <4 <4 < 16 .< 6 < 29 04/25/18 - 05/30/18 <3 <4 <8 <4 <7 <4 <6 <4 <3 < 20 < 6 < 25 05/30/18 - 06/27/18 < 5 < 5 < 8 < 6 <9 <5 < 11 <6 <6 < 23 < 9 < 40 06/27/18 - 07/25/18 < 7 < 7 < 14 <7 < 15 < 7 < 13 < 8 < 7 < 27 < 11 < 51 07/25/18 - 08/29/18 < 6 <7 < 13 <8 < 15 <8 < 11 < 8 <7 < 33 < 8 < 52 08/29/18 - 09/26/18 < 8 <7 < 15 <6 < 17 < 7 < 15 < 8 <7 < 37 < 13 < 55 09/26/18 - 10/31/18 < 7 < 7 < 13 <7 < 11 <7 < 10 < 6 < 8 < 31 < 10 < 47 10/31/18 - 11/28/18 <4 < 5 < 10 <5 < 8 < 5 < 8 <4 <4 < 28 < 11 < 34 11/28/18 - 12/26/18 < 7 <5 < 12 <6 < 11 < 8 < 13 < 9 < 6 < 32 < 12 < 43 0 MEAN 01

Table C-111.1 CONCENTRATIONS OF TRITIUM IN WELL WATER SAMPLES COLLECTED IN THE VICINITY OF CLINTON POWER STATION, 2018 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION PERIOD CL-07D CL-12R CL-12T 03/28/18 - 03/28/18 < 179 < 180 < 177 06/27/18 - 06/27/18 < 178 < 180 < 179 09/26/18 - 09/26/18 < 191 < 192 < 191 12/26/18 - 12/26/18 < 193 < 186 < 188 MEAN C-6

~ _,j

Table C-111.2 CONCENTRATIONS OF GAMMA EMITTERS IN WELL WATER SAMPLES COLLECTED IN THE VICINITY OF CLINTON POWER STATION, 2018 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-070 03/28/18 < 8 < 8 < 14 < 10 < 11 < 10 < 13 <9 < 8 < 32 < 9 < 66 06/27/18 < 7 <4 < 10 < 6 < 13 < 6 < 12 <8 < 6 < 31 < 11 < 43 09/26/18 < 7 < 5 < 13 <7 < 16 < 9 < 13 <8 < 7 < 38 < 12 < 60 12/26/18 < 2 <2 <4 <2 <3 <2 < 3 <2 <2 < 16 < 5 < 12 MEAN CL-12R 03/28/18 <5 <6 < 12 <7 < 11 < 6 < 10 <8 <7 < 27 < 9 < 46 06/27/18 < 5 <7 < 11 < 6 < 13 <5 < 10 <6 <7 < 31 < 10 < 34 09/26/18 < 6 <8 < 12 <6 < 15 < 9 < 12 <6 <8 < 35 < 10 < 52 12/26/18 <6 <7 < 14 <8 < 12 <5 < 11 <6 <4 < 28 < 10 < 45 MEAN

()

-!.i CL-12T 03/28/18 <7 < 6 < 12 < 6 < 13 < 6 < 10 <7 < 6 < 28 < 7 < 52 06/27/18 <7 < 5 < 15 < 5 < 15 <6 < 14 <7 < 7 < 34 < 9 < 46 09/26/18 < 6 < 6 < 14 < 8 < 15 < 8 < 12 < 10 < 8 < 34 < 14 < 48 12/26/18 < 6 < 6 < 10 < 7 < 14 < 6 < 11 <7 < 6 < 27 < 12 < 46 MEAN

Table C-IV.1 CONCENTRATIONS OF GAMMA EMITTERS IN FISH SAMPLES COLLECTED IN THE VICINITY OF CLINTON POWER STATION, 2018 RESULTS IN UNITS OF PCI/KG WET+/- 2 SIGMA COLLECTION SITE PERIOD Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 Cs-134 Cs-137 Ba-140 La-140 Ce-144 CL-19 Bluegill 04/24/18 < 37 < 41 < 95 < 46 < 103 < 53 < 79 < 50 < 45 < 235 < 53 < 268 Carp 04/24/18 < 89 < 86 < 159 < 93 < 210 < 90 < 128 < 94 < 83 < 410 < 138 < 419 Channel Catfish 04124118 < 75 < 78 < 151 < 71 < 185 < 87 < 162 < 71 < 92 < 449 < 172 < 435 Largemouth Bass 04124118 < 57 < 46 < 95 < 76 < 104 < 64 < 100 < 58 < 54 < 292 < 87 < 328 Bluegill 10/01118 < 68 < 77 < 125 < 68 < 136 < 73 < 133 < 71 < 70 < 423 < 90 < 352 Carp 10101118 < 76 < 69 < 148 < 69 < 150 < 69 < 122 < 79 < 73 < 385 < 124 < 429 Channel Catfish 10101/18 < 44 < 35 < 83 < 36 < 105 < 44 < 79 < 43 < 40 < 206 < 72 < 220 Largemouth Bass 10101118 < 50 < 50 < 84 < 41 < 89 < 56 < 56 < 45 < 40 < 243 < 53 < 225 MEAN CL-105 Carp 04124/18 < 78 < 69 < 145 < 67 < 146 < 71 < 137 < 74 < 81 < 355 < 155 < 273 Largemouth Bass 04124118 < 78 < 76 < 183 < 95 < 193 < 87 < 152 < 83 < 89 < 408 < 93 < 430 Bluegill 05102/18 < 61 < 51 < 106 < 89 < 140 < 64 < 109 < 63 < 62 < 306 < 79 < 292 c;i 0, Crappie 05102118 < 38 < 37 < 83 < 38 < 58 < 43 < 58 < 37 < 43 < 198 < 76 < 222 Bluegill 10101/18 < 65 < 73 < 137 < 63 < 163 < 82 < 99 < 67 < 76 < 355 < 75 < 353 Carp 10101118 < 50 < 40 < 86 < 38 < 90 < 47 < 75 < 44 < 34 < 214 < 64 < 242 Crappie/White Bass 10101118 < 36 < 29 < 82 < 46 < 72 < 45 < 64 < 34 < 40 * < 210 < 65 < 210 Largemouth Bass 10101/18 < 68 < 59 < 119 < 63 < 135 < 54 < 95 < 56 < 51 < 373 < 90 < 364 MEAN

Table C-V.1 CONCENTRATIONS OF GAMMA EMITTERS IN SEDIMENT SAMPLES COLLECTED IN THE VICINITY OF CLINTON POWER STATION, 2018 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-07B 04/24/18 < 93 < 87 < 122 < 58 < 176 < 95 < 160 < 99 < 85 < 614 < 168 < 464 10/01/18 < 56 < 55 < 113 < 64 < 99 < 49 < 90 < 63 < 50 < 282 < 67 < 281 MEAN CL-105 04/24/18 < 52 < 51 < 163 < 53 < 102 < 56 < 93 < 73 < 59 < 418 < 74 < 309 10/01/18 < 44 < 44 < 101 < 43 < 97 < 44 < 78 < 48 < 47 < 202 < 76 < 216 MEAN

Table C-Vl.1 CONCENTRATIONS OF GROSS BETA IN AIR PARTICULATE SAMPLES COLLECTED IN THE VICINITY OF CLINTON POWER STATION, 2018 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 01103118 - 01110118 31 +/- 5 34 +/- 5 28 +/- 5 30 +/- 5 36 +/- 5 31 +/- 5 01110118 - 01117118 19 +/- 4 16 +/-4 16 +/- 4 17 +/- 4 18 +/- 4 15 +/- 4 01117118 - 01124118 20 +/- 4 19 +/- 4 22 +/- 5 16 +/- 4 18 +/- 4 16 +/- 4 01124118 - 01131118 12 +/- 4 12 +/- 4 15 +/- 4 14 +/- 4 11 +/- 4 14 +/- 4 01131118 - 02107118 15 +/- 4 19 +/- 5 15 +/- 4 15 +/- 4 17 +/- 5 16 +/- 4 02107118 - 02114118 28 +/- 5 31 +/- 5 27 +/- 5 29 +/- 5 32 +/- 5 26 +/- 5 02114118 - 02121118 15 +/- 4 22 +/- 5 17 +/- 4 16 +/- 4 19 +/- 4 21 +/- 5 02121118 - 02/28118 13 +/- 4 16 +/-4 13 +/- 4 15 +/- 4 12 +/- 4 15 +/- 4 02128118 - 03107118 16 +/- 4 18 +/-4 14 +/- 4 17 +/- 4 15 +/- 4 13 +/- 4 03107118 - 03114118 16 +/- 4 18 +/- 5 17 +/- 4 14 +/- 4 17 +/- 4 17 +/- 4 03114118 - 03121118 14 +/- 4 15 +/-4 15 +/- 4 13 +/- 4 14. +/- 4 11 +/- 4 03121118 - 03128118 12 +/- 4 11 +/-4 13 +/- 4 13 +/- 4 11 +/- 4 14 +/- 4 03128118 - 04104118 15 +/- 4 9 +/-4 14 +/- 4 17 +/- 5 13 +/- 4 16 +/- 4 04104118 - 04111118 17 +/- 5 16 +/- 5 20 +/- 5 21 +/- 5 15 +/- 4 16 +/- 4 04111118 - 04118118 13 +/- 4 11 +/- 3 13 +/- 4 14 +/- 4 14 +/- 4 15 +/- 4 04118118 - 04125118 15 +/- 4 17 +/-4 10 +/- 4 14 +/- 4 13 +/- 4 17 +/- 4 04125118 - 05102118 11 +/- 4 16 +/- 4 12 +/- 4 14 +/- 4 14 +/- 4 15 +/- 4 05102118 - 05109118 18 +/- 4 20 +/- 4 20 +/- 4 21 +/- 4 22 +/- 4 21 +/- 4 05109118 - 05116118 17 +/- 5 20 +/- 5 20 +/- 5 14 +/- 5 16 +/- 5 13 +/- 5 05116118 - 05123118 18 +/- 4 18 +/-4 19 +/- 4 18 +/- 4 19 +/- 4 14 +/- 4 05123118 - 05130118 22 +/- 5 19 +/-4 21 +/- 5 16 +/- 4 20 +/- 4 18 +/- 4 05130118 - 06106118 13 +/- 4 13 +/-4 14 +/- 4 19 +/- 4 14 +/- 4 16 +/- 4 06106118 - 06113118 17 +/- 4 23 +/- 4 18 +/- 4 20 +/- 4 21 +/- 4 21 +/- 4 06113118 - 06120118 16 +/- 4 14 +/-4 13 +/- 4 16 +/- 4 16 +/- 4 16 +/- 4 06120118 - 06127118 10 +/- 3 12 +/-4 10 +/- 3 17 +/- 4 13 +/- 4 13 +/- 4 06127118 - 07104118 15 +/- 4 17 +/-4 15 +/- 4 13 +/- 4 18 +/- 4 13 +/- 4 07104118 - 07111118 15 +/- 4 20 +/- 5 12 +/- 4 17 +/- 4 18 +/- 4 15 +/- 4 07111118 - 07118118 20 +/- 4 18 +/-4 16 +/- 4 19 +/- 4 15 +/- 4 16 +/- 4 07118118 - 07125118 (1) 07125118 - 08101118 19 +/- 4 17 +/-4 18 +/- 4 20 +/- 4 18 +/- 4 15 +/- 4 08101118 - 08108118 32 +/- 5 28 +/- 5 28 +/- 5 29 +/- 5 28 +/- 5 21 +/- 5 08108118 - 08115118 25 +/- 5 20 +/-4 22 +/- 4 23 +/- 4 22 +/- 4 23 +/- 4 08115118 - 08122118 18 +/- 4 16 +/-4 15 +/- 4 19 +/- 4 14 +/- 4 15 +/- 4 08122118 - 08129118 25 +/- 4 22 +/-4 21 +/- 4 25 +/- 4 26 +/- 5 20 +/- 4 08129118 - 09105118 15 +/- 4 17 +/- 4 13 +/- 4 16 +/- 4 16 +/- 4 14 +/- 4 09105118 - 09112118 11 +/- 4 13 +/-4 10 +/- 3 12 +/- 4 11 +/- 4 12 +/- 4 09112118 - 09119118 16 +/- 4 18 +/-4 14 +/- 4 19 +/- 4 20 +/- 4 14 +/- 4 09119118 - 09126118 13 +/- 4 15 +/-4 11 +/- 4 14 +/- 4 12 +/- 4 12 +/- 4 09126118 - 10103118 18 +/- 4 21 +/-4 23 +/- 4 24 +/- 5 21 +/- 4 13 +/- 4 10103118 - 10110118 12 +/- 4 13 +/-4 9+/-4 13 +/- 4 13 +/- 4 10 +/- 4 10110118 - 10117118 14 +/- 4 12 +/-4 12 +/- 4 13 +/- 4 10 +/- 3 9 +/- 3 10117118 - 10124118 12 +/- 4 14 +/-4 13 +/- 4 12 +/- 4 15 +/- 4 11 +/- 4 10124118 - 10131118 16 +/- 4 21 +/-4 17 +/- 4 19 +/- 4 18 +/- 4 18 +/- 4 10131118 - 11107118 14 +/- 4 16 +/-4 15 +/- 4 14 +/- 4 18 +/- 4 14 +/- 4 11107118 - 11114118 21 +/- 4 17 +/-4 16 +/- 4 17 +/- 4 16 +/- 4 18 +/- 4 11114118 - 11121118 23 +/- 5 21 +/-4 21 +/- 4 26 +/- 5 24 +/- 5 21 +/- 4 11121118 - 11128118 31 +/- 5 34 +/- 5 30 +/- 5 30 +/- 5 30 +/- 5 30 +/- 5 11128118 - 12105118 13 +/- 4 17 +/-4 15 +/- 4 17 +/- 4 16 +/- 4 16 +/- 4 12105118 - 12112118 32 +/- 5 30 +/- 5 29 +/- 5 28 +/- 5 29 +/- 5 24 +/- 4 12112118 - 12119118 23 +/- 5 31 +/- 5 25 +/- 5 28 +/- 5 31 +/- 5 25 +/- 5 12119118 - 12126118 19 +/- 4 19 +/- 4 19 +/- 4 19 +/- 4 20 +/- 4 18 +/- 4 12126118 - 01102119 16 +/- 4 15 +/-4 14 +/- 4 15 +/- 4 17 +/- 4 13 +/- 4 MEAN+/- 2 STD DEV 18 +/- 11 18 +/- 11 17 +/- 11 18 +/- 10 18 +/- 12 17 +/- 9 THE MEAN AND TWO STANDARD DEVIATION ARE CALCULATED USING THE POSITIVE VALUES (1) SEE PROGRAM EXCEPTIONS SECTION FOR EXPLANATION C-10

Table C-Vl.1 CONCENTRATIONS OF GROSS BETA IN AIR PARTICULATE SAMPLES COLLECTED IN THE VICINITY OF CLINTON POWER STATION, 2018 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 01/03/18 - 01/10/18 23 +/- 5 27 +/- 5 31 +/- 5 30 +/- 5 01/10/18 - 01/17/18 17 +/- 4 15 +/- 4 15 +/- 4 16 +/- 4 01/17/18 - 01/24/18 17 +/- 4 18 +/- 4 16 +/- 4 17 +/- 4 01/24/18 - 01/31/18 13 +/- 4 15 +/- 4 16 +/- 4 13 +/- 4 01/31/18 - 02/07/18 15 +/- 4 14 +/- 4 17 +/- 5 17 +/- 5 02/07/18 - 02/14/18 25 +/- 5 26 +/- 5 26 +/- 5 25 +/- 5 02/14/18 - 02/21/18 19 +/- 4 17 +/- 4 18 +/- 4 22 +/- 5 02/21/18 - 02/28/18 13 +/- 4 14 +/- 4 14 +/- 4 16 +/- 4 02/28/18 - 03/07/18 16 +/- 4 11 +/- 4 10 +/- 4 14 +/- 4 03/07/18 - 03/14/18 17 +/- 4 14 +/- 4 19 +/- 4 17 +/- 4 03/14/18 - 03/21/18 16 +/- 4 15 +/- 4 14 +/- 4 16 +/- 4 03/21/18 - 03/28/18 14 +/- 4 12 +/- 4 12 +/- 4 10 +/- 4 03/28/18 - 04/04/18 15 +/- 4 11 +/- 4 16 +/- 4 13 +/- 4 04/04/18 - 04/11/18 15 +/- 4 17 +/- 4 18 +/- 5 16 +/- 4 04/11/18 - 04/18/18 12 +/- 4 15 +/- 4 15 +/- 4 13 +/- 4 04/18/18 - 04/25/18 13 +/- 4 18 +/- 4 15 +/- 4 13 +/- 4 04/25/18 - 05/02/18 16 +/- 4 15 +/- 4 16 +/- 4 13 +/- 4 05/02/18 - 05/09/18 20 +/-4 18 +/- 4 23 +/- 4 25 +/- 5 05/09/18 - 05/16/18 16 +/-5 16 +/- 5 15 +/- 5 17 +/-5 05/16/18 - 05/23/18 20 +/-4 18 +/- 4 20 +/- 4 16 +/-4 05/23/18 - 05/30/18 20 +/-4 23 +/- 5 19 +/- 4 20 +/-4 05/30/18 - 06/06/18 15 +/-4 15 +/-4 16 +/- 4 18 +/-4 06/06/18 - 06/13/18' 18 +/-4 20 +/-4 20 +/- 4 21 +/-4 06/13/18 - 06/20/18 16 +/-4 15 +/-4 19 +/- 4 15 +/-4 06/20/18 - 06/27/18 12 +/-4 10 +/- 3 13 +/- 4 12 +/- 3 06/27/18 - 07/04/18 18 +/-4 12 +/-4 14 +/-4 6 +/-3 07/04/18 - 07/11/18 20 +/-4 21 +/- 5 18 +/-4 16 +/-4 07/11/18 - 07/18/18 16 +/-4 18 +/-4 17 +/-4 18 +/-4 07/18/18 - 07/25/18 (1) 07/25/18 - 08/01/18 19 +/- 4 18 +/- 4 18 +/- 4 15 +/- 4 08/01/18 - 08/08/18 30 +/- 5 28 +/- 5 27 +/- 5 27 +/- 5 08/08/18 - 08/15/18 25 +/- 4 22 +/- 4 24 +/- 4 12 +/- 3 08/15/18 - 08/22/18 18 +/- 4 15 +/- 4 18 +/- 4 17 +/- 4 08/22/18 - 08/29/18 22 +/- 4 18 +/- 4 18 +/- 4 19 +/- 4 08/29/18 - 09/05/18 15 +/- 4 14 +/- 4 17 +/- 4 15 +/- 4 09/05/18 - 09/12/18 9+/-3 10 +/- 3 12 +/- 4 14 +/- 4 09/12/18 - 09/19/18 17 +/- 4 18 +/- 4 20 +/- 5 22 +/- 5 09/19/18 - 09/26/18 13 +/- 4 14 +/- 4 16 +/- 4 15 +/- 4 09/26/18 - 10/03/18 19 +/- 4 21 +/- 4 21 +/- 4 17 +/- 4 10/03/18 - 10/10/18 14 +/- 4 12 +/- 4 14 +/- 4 16 +/- 4 10/10/18 - 10/17/18 12 +/- 4 12 +/- 4 14 +/- 4 12 +/- 4 10/17/18 - 10/24/18 14 +/- 4 13 +/- 4 12 +/- 4 11 +/- 4 10/24/18 - 10/31/18 15 +/- 4 19 +/- 4 19 +/- 4 16 +/- 4 10/31/18 - 11/07/18 16 +/- 4 12 +/- 4 14 +/- 4 15 +/- 4 11/07/18 - 11/14/18 19 +/- 4 20 +/- 4 22 +/- 4 18 +/- 4 11/14/18 - 11/21/18 25 +/- 5 26 +/- 5 26 +/- 5 25 +/- 5 11/21/18 - 11/28/18 35 +/- 5 31 +/- 5 35 +/- 5 31 +/- 5 11/28/18 - 12/05/18 16 +/- 4 16 +/- 4 21 +/- 4 20 +/- 4 12/05/18 - 12/12/18 28 +/- 5 29 +/- 5 29 +/- 5 29 +/- 5 12/12/18 - 12/19/18 22 +/- 5 26 +/- 5 31 +/- 5 23 +/- 5 12/19/18 - 12/26/18 21 +/- 4 18 +/- 4 15 +/- 4 14 +/- 4 12/26/18 - 01/02/19 12 +/- 4 15 +/- 4 13 +/- 4 16 +/- 4 MEAN +/- 2 STD DEV 18 +/- 10 17 +/- 10 18 +/- 11 17 +/- 10 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, 2018 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 01/03/18 - 01/31/18 11 36 20 +/- 15 01/03/18 - 01/31/18 13 31 18 +/- 11 01/03/18 - 01/31/18 13 30 19 +/- 15 01/31/18 - 02/28/18 12 32 19 +/- 12 01/31/18 - 02/28/18 13 26 18 +/- 9 01/31/18 - 02/28/18 16 25 20 +/- 9 02/28/18 - 04/04/18 9 18 14 +/- 4 02/28/18 - 04/04/18 10 19 14 +/- 5 02/28/18 - 04/04/18 10 17 14 +/- 6 04/04/18 - 05/02/18 10 21 15 +/- 5 04/04/18 - 05/02/18 12 18 15 +/- 4 04/04/18 - 05/02/18 13 16 13 +/- 3 05/02/18 - 05/30/18 13 22 18 +/- 5 05/02/18 - 05/30/18 15 23 19 +/- 5 05/02/18 - 05/30/18 16 25 20 +/- 8 05/30/18 - 07/04/18 10 23 15 +/- 6 05/30/18 - 07/04/18 10 20 15 +/- 6 05/30/18 - 07/04/18 6 21 14 +/- 12 07/04/18 - 08/01/18 12 20 17 +/- 5 07/04/18 - 08/01/18 16 21 18 +/- 3 07/04/18 - 08/01/18 15 18 16 +/- 3 08/01 /18 - 08/29/18 14 32 22 +/- 10 08/01/18 - 08/29/18 15 30 22 +/- 9 08/01/18 - 08/29/18 12 27 19 +/- 12 08/29/18 - 10/03/18 10 24 15 +/- 7 08/29/18 - 10/03/18 9 21 16 +/- 8 08/29/18 - 10/03/18 14 22 17 +/- 7 10/03/18 - 10/31/18 9 21 14 +/- 6 10/03/18 - 10/31/18 12 19 14 +/- 5 10/03/18 - 10/31/18 11 16 14 +/- 6 10/31/18 - 11/28/18 14 34 22 +/- 13 10/31/18 - 11/28/18 12 35 23 +/- 15 10/31/18 - 11/28/18 15 31 22 +/- 14

~

N 11/28/18 - 01/02/19 13 32 21 +/- 12 11/28/18 - 01/02/19 12 31 21 +/- 13 11/28/18 - 01/02/19 14 29 21 +/- 12 01/03/18 - 01/02/19 9 36 18 +/- 11 01/03/18 - 01/02/19 9 35 18 +/- 10 01/03/18 - 01/02/19 6 31 17 +/- 10

Table C-Vl.3 CONCENTRATIONS OF GAMMA EMITTERS IN AIR PARTICULATE SAMPLES COLLECTED IN THE VICINITY OF CLINTON POWER STATION, 2018 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 01/03/18 - 04/04/18 <2 <2 <3 <2 < 18 <2 <2 <3 < 10 04/04/18 - 07/04/18 <3 <3 <5 <2 < 21 <3 <3 <4 < 11 07/04/18 - 10/03/18 <3 <3 <5 <3 < 22 <3 <2 <4 < 11 10/03/18 - 01/02/19 <3 <2 <3 <3 < 23 <2 <3 <3 < 10 MEAN CL-2 01/03/18 - 04/04/18 <3 <3 <5 <3 < 20 <2 <2 <3 <9 04/04/18 - 07/04/18 <3 <3 <4 <2 < 21 <2 <3 <4 < 10 07/04/18 - 10/03/18 <3 <2 <5 <3 < 23 <3 <2 <4 < 11 10/03/18 - 01/02/19 <2 <2 <5 <2 < 23 <3 <2 <3 < 10 MEAN

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w CL-3 01/03/18 - 04/04/18 <3 <2 <4 <3 < 24 <2 <2 <2 < 6 04/04/18 - 07/04/18 <2 <2 <5 <2 < 17 <2 <2 <3 < 9 07/04/18 - 10/03/18 <2 <2 <4 <3 < 15 < 1 <3 <3 < 8 10/03/18 - 01/02/19 <3 <3 <5 <3 < 23 <3 <3 <4 < 14 MEAN CL-4 01/03/18 - 04/04/18 <4 <5 <8 <4 < 32 <4 <3 <4 < 14 04/04/18 - 07/04/18 <3 <4 <7 <4 < 32 <4 <3 <4 < 14 07/04/18 - 10/03/18 <3 <2 <5 <3 < 20 <2 < 1 <4 < 10 10/03/18 - 01/02/19 <3 <3 <5 <3 < 21 <4 <3 <4 < 15 MEAN CL-6 01/03/18 - 04/04/18 <2 <2 <4 <2 < 17 <2 <2 <3 <9 04/04/ 18 - 07/04/ 18 <2 <2 <5 <3 < 23 <3 <3 <4 < 11 07/04/18 - 10/03/18 <3 <3 <5 <3 < 22 <3 <3 <4 < 12 10/03/18 - 01/02/19 <2 <2 <3 <2 < 22 <2 <2 <3 <9 MEAN

Table C-Vl.3 CONCENTRATIONS OF GAMMA EMITTERS IN AIR PARTICULATE SAMPLES COLLECTED IN THE VICINITY OF CLINTON POWER STATION, 2018 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 01/03/18 - 04/04/18 < 1 <2 <4 < 3 < 22 < 3 <2 <4 < 11 04/04/18 - 07/04/18 <2 <2 <4 <2 < 20 < 3 <2 < 3 < 10 07/04/18 - 10/03/18 <4 <2 < 6 < 3 < 17 <2 <2 <4 <9 10/03/18 - 01/02/19 <2 <2 <4 <2 < 21 <2 <2 <3 <8 MEAN CL-8 01/03/18 - 04/04/18 < 3 < 3 <4 < 3 < 20 < 3 <2 <2 <7 04/04/18 - 07/04/18 <2 <2 <3 <2 < 16 <2 <2 <3 <9 07/04/18 - 10/03/18 < 3 <4 <8 <5 < 28 <4 < 3 <6 < 14 10/03/18 - 01/02/19 < 3 <3 <4 <3 < 22 <3 < 3 <4 < 14 MEAN CL-11 01/03/18 - 04/04/18 <4 <4 <7 <4 < 26 < 3 <3 <4 < 13

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-I> 04/04/18 - 07/04/18 <2 < 3 <5 <2 < 19 <2 <2 <3 <9 07/04/18 - 10/03/18 <2 < 3 <5 <3 < 18 < 3 <3 <4 < 10 10/03/18 - 01/02/19 < 3 <2 <4 < 2 < 17 < 3 <2 <3 < 10 MEAN CL-15 01/03/18 - 04/04/18 <2 <2 <4 <2 < 15 <2 <2 <3 < 9 04/04/18 - 07/04/18 <2 <3 <5 <3 < 18 <2 < 3 <3 < 13 07/04/18 - 10/03/18 <3 <2 <5 <3 < 19 <3 <2 <4 < 10 10/03/18 - 01/02/19 <3 <3 <6 <3 < 26 <3 <3 <4 < 14 MEAN CL-94 01/03/18 - 04/04/18 <2 <2 <3 <3 < 18 <2 <2 <3 < 8 04/04/18 - 07/04/18 <3 < 3 <4 <2 < 23 <3 <2 < 3 < 10 07/04/18 - 10/03/18 <3 <2 <4 <2 < 18 <2 <2 <3 < 8 10/03/18 - 01/02/19 <2 <2 <4 <3 < 19 <2 <2 <2 < 8 MEAN

Table C-Vll.1 CONCENTRATIONS OF 1-131 IN AIR IODINE SAMPLES COLLECTED IN THE VICINITY OF CLINTON POWER STATION, 2018 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 01/03/18 - 01/10/18 < 48 < 48 < 48 < 48 < 27 < 27 01/10/18 - 01/17/18 < 65 < 67 < 68 < 67 < 62 < 62 01/17/18 - 01/24/18 < 48 < 48 < 48 < 47 < 33 < 33 01/24/18 - 01/31/18 < 47 < 47 < 47 < 46 < 33 < 34 01/31/18 - 02/07/18 < 35 < 35 < 35 < 35 < 24 < 20 02/07/18 - 02/14/18 < 48 < 47 < 48 < 48 < 51 < 51 02/14/18 - 02/21/18 < 36 < 36 < 36 < 35 < 23 < 23 02/21/18 - 02/28/18 < 57 < 58 < 57 < 58 < 29 < 29 02/28/18 - 03/07/18 < 61 < 60 < 60 < 60 < 29 < 29 03/07/18 - 03/14/18 < 41 < 42 < 40 < 40 < 26 < 26 03/14/18 - 03/21/18 < 56 < 57 < 56 < 56 < 31 < 31 03/21/18 - 03/28/18 < 41 . < 41 < 41 < 41 < 28 < 15 03/28/18 - 04/04/18 < 29 < 29 < 29 < 29 < 26 < 26 04/04/18 - 04/11/18 < 54 < 57 < 55 < 55 < 27 < 27 04/11 /18 - 04/18/18 < 47 < 46 < 19 < 47 < 29 < 29 04/18/18 - 04/25/18 < 24 < 24 < 24 < 54 < 54 < 23 04/25/18 - 05/02/18 < 17 < 18 < 17 < 17 < 31 < 31 05/02/18 - 05/09/18 < 56 < 56 < 55 < 56 < 18 < 34 05/09/18 - 05/16/18 < 31 < 32 < 32 < 51 < 24 < 24 05/16/18 - 05/23/18 < 41 < 41 < 41 < 21 < 24 < 24 05/23/18 - 05/30/18 < 61 < 61 < 61 < 30 < 50 < 50 05/30/18 - 06/06/18 < 30 < 31 < 30 < 30 < 53 < 54 06/06/18 - 06/13/18 < 52 < 50 < 52 < 52 < 31 < 31 06/13/18 - 06/20/18 < 26 < 26 < 26 < 26 < 33 < 33 06/20/18 - 06/27/18 < 41 < 41 < 41 < 41 < 57 < 24 06/27/18 - 07/04/18 < 61 < 61 < 61 < 61 < 41 < 41 07/04/18 - 07/11/18 < 32 < 32 < 32 < 32 < 51 < 21 07/11/18 - 07/18/18 < 32 < 32 < 32 < 32 < 63 < 63 07/18/18 - 07/25/18 (1) 07/25/18 - 08/01/18 < 55 < 55 < 55 < 55 < 46 < 46 08/01/18 - 08/08/18 < 66 < 66 < 66 < 66 < 50 < 50 08/08/18 - 08/15/18 < 57 < 55 < 57 < 57 < 60 < 60 08/15/18 - 08/22/18 < 65 < 65 < 66 < 65 < 57 < 57 08/22/18 - 08/29/18 < 32 < 33 < 31 < 32 < 39 < 37 08/29/18 - 09/05/18 < 46 < 46 < 46 < 46 < 55 < 56 09/05/18 - 09/12/18 < 31 < 31 < 30 < 30 < 58 < 57 09/12/18 - 09/19/18 < 35 < 35 < 35 < 35 < 24 < 57 09/19/18 - 09/26/18 < 65 < 64 < 67 < 67 < 31 < 32 09/26/18 - 10/03/18 < 48 < 48 < 49 < 49 < 63 < 64 10/03/18 - 10/10/18 < 47 < 47 < 47 < 47 < 51 < 27 10/10/18 - 10/17/18 < 46 < 46 < 36 < 44 < 60 < 59 10/17/18 - 10/24/18 < 32 < 31 < 31 <,31 < 47 < 47 10/24/18 - 10/31/18 < 39 < 39 < 39 < 39 < 54 < 54 10/31/18 - 11/07/18 < 35 < 36 < 36 < 36 < 56 < 56 11/07/18 - 11/14/18 < 29 < 29 < 29 < 29 < 65 < 65 I

11/14118 - 11/21/18 < 49 < 49 < 49 < 49 < 34 < 35 11/21/18 - 11/28/18 < 59 < 60 < 61 < 25 < 58 < 57 11/28/18 - 12/05/18 < 20 < 19 < 19 < 19 < 38 < 38 12/05/18 - 12/12/18 < 33 < 32 < 32 < 33 < 56 < 57 12/12/18 - 12/19/18 < 41 < 42 < 41 < 41 < 48 < 47 12/19/18 - 12/26/18 < 69 < 68 < 69 < 69 < 67 < 68 12/26/18 - 01/02/19 < 59 < 61 < 60 < 60 < 68 < 69 MEAN (1) SEE PROGRAM EXCEPTIONS SECTION FOR EXPLANATION C-15

Table C-Vll.1 CONCENTRATIONS OF 1-131 IN AIR IODINE SAMPLES COLLECTED IN THE VICINITY OF CLINTON POWER STATION, 2018 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 01/03/18 - 01/10/18 < 20 < 27 < 27 < 22 01/10/18 - 01/17/18 < 35 < 33 < 62 < 62 01/17/18 - 01/24/18 < 20 < 27 < 33 < 32 01/24/18 - 01/31/18 < 20 < 34 < 34 < 27 01/31/18 - 02/07/18 < 15 < 24 < 24 < 24 02/07/18 - 02/14/18 < 24 < 28 < 50 < 49 02/14/18 - 02/21/18 < 15 < 23 < 23 < 19 02/21/18 - 02/28/18 < 24 < 29 < 24 < 29 02/28/18 - 03/07/18 < 26 < 24 < 29 < 28 03/07/18 - 03/14/18 < 17 < 21 < 26 < 26 03/14/18 - 03/21 /18 < 24 < 26 < 31 < 31 03/21 /18 - 03/28/18 < 17 < 28 < 27 < 28 03/28/18 - 04/04/18 < 12 < 15 < 26 < 26 04/04/18 - 04/11 /18 < 23 < 22 < 27 < 26 04/11/18 - 04/18/18 < 48 < 24 < 29 < 29 04/18/18 - 04/25/18 < 24 < 53 < 53 < 20 04/25/18 - 05/02/18 < 14 < 13 < 31 < 31 05/02/18 - 05/09/18 < 24 < 34 < 34 < 34 05/09/18 - 05/16/18 < 32 < 52 < 52 < 23 05/16/18 - 05/23/18 < 41 < 21 < 21 < 24 05/23/18 - 05/30/18 < 61 < 30 < 30 < 49 05/30/18 - 06/06/18 < 17 < 19 < 54 < 54 06/06/18 - 06/13/18 < 27 < 17 < 31 < 31 06/13/18 - 06/20/18 < 22 < 28 < 33 < 34 06/20/18 - 06/27/18 < 34 < 56 < 57 < 55 06/27/18 - 07/04/18 < 25 < 35 < 41 < 41 07/04/18 - 07/11/18 < 26 < 50 < 50 < 50 07/11/18 - 07/18/18 < 27 < 27 < 63 < 63 07/18/18 - 07/25/18 (1) 07/25/18 - 08/01/18 < 29 < 19 < 46 < 47 08/01/18 - 08/08/18 < 28 < 21 < 50 < 49 08/08/18 - 08/15/18 < 25 < 31 < 60 < 58 08/15/18 - 08/22/18 < 34 < 20 < 57 < 56 08/22/18 - 08/29/18 < 27 < 31 < 37 < 37 08/29/18 - 09/05/18 < 19 < 24 < 56 < 55 09/05/18 - 09/12/18 < 27 < 24 < 57 < 59 09/12/18 - 09/19/18 < 30 < 57 < 57 < 58 09/19/18 - 09/26/18 < 28 < 26 < 32 < 31 09/26/18 - 10/03/18 < 26 < 63 < 28 < 63 10/03/18 - 10/10/18 < 26 < 51 < 51 < 51 10/10/18 - 10/17/18 < 46 < 25 < 59 < 59 10/17/18 - 10/24/18 < 26 < 19 < 46 < 46 10/24/18 - 10/31/18 < 33 < 23 < 54 < 55 10/31/18 - 11/07/18 < 30 < 56 < 55 < 23 11/07/18 - 11/14/18 < 24 < 27 < 65 < 65 11/14/18 - 11/21/18 < 23 < 29 < 34 < 34 11/21/18 - 11/28/18 < 61 < 24 < 58 < 57 11/28/18 - 12/05/18 < 16 < 32 < 37 < 38 12/05/18 - 12/12/18 < 28 < 24 < 57 < 57 12/12/18 - 12/19/18 < 36 < 26 < 47 < 47 12/19/18 - 12/26/18 < 30 < 37 < 68 < 67 12/26/18 - 01/02/19 < 25 < 29 < 69 < 69 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, 2018 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION CONTROL FARM PERIOD CL-116 01/31/18, < 0.5 02/28/18 < 0.7 03/28/18 < 0.6 04/25/18 < 0.7 05/09/18 < 0.6 05/23/18 < 0.5 06/06/18 < 0.6 06/20/18 < 0.7 07/04/18 < 0.7 07/18/18 < 0.8 08/01/18 < 0.6 08/15/18 < 0.8 08/29/18 < 0.6 09/12/18 < 0.7 09/26/18 < 0.5 10/10/18 < 0.6 10/24/18 < 0.7 11/28/18 < 0.7 12/26/18 < 0.7 MEAN C-17

Table C-Vlll.2 CONCENTRATIONS OF GAMMA EMITTERS IN MILK SAMPLES COLLECTED IN THE VICINITY OF CLINTON POWER STATION, 2018 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 01/31/18 1024 +/- 151 < 10 < 10 < 20 < 11 < 27 < 11 < 18 < 11 < 9 < 39 < 11 < 92 02/28/18 1133 +/- 165 < 11 < 11 < 24 < 11 < 33 < 13 < 17 < 12 < 12 < 53 < 14 < 99 03/28/18 1184 +/- 140 < 7 < 7 < 13 < 9 < 15 < 7 < 13 < 8 < 7 < 31 < 9 < 59 04/25/18 790 +/- 133 < 8 < 8 < 17 < 8 < 18 < 7 < 14 < 8 < 9 < 34 < 13 < 56 05/09/18 952 +/- 137 < 5 < 6 < 14 < 6 < 14 < 6 < 11 < 7 < 7 < 29 < 10 < 45 05/23/18 1103 +/- 138 < 6 < 7 < 13 < 6 < 14 < 7 < 11 < 6 < 7 < 32 < 7 < 52 06/06/18 1090 +/- 165 < 7 < 9 < 21 < 10 < 20 < 7 < 14 < 9 < 9 < 35 < 10 < 58 06/20/18 1184 +/- 174 < 6 < 7 < 15 < 5 < 17 < 8 < 11 < 8 < 8 < 26 < 8 < 57 07/04/18 1118 +/- 188 < 7 < 7 < 16 < 8 < 22 < 8 < 14 < 9 < 8 < 35 < 12 < 55 07/18/18 1244 +/- 201 < 9 < 7 < 23 < 10 < 16 < 8 < 13 < 10 < 10 < 41 < 14 < 66 08/01/18 1273 +/- 148 < 8 < 7 < 18 < 10 < 21 < 8 < 12 < 8 < 8 < 32 < 11 < 48 08/15/18 1333 +/- 166 < 5 < 5 < 16 < 11 < 13 < 7 < 11 < 8 < 7 < 25 < 10 < 44

~

CX) 08/29/18 1200 +/- 170 < 7 < 6 < 14 < 7 < 16 < 7 < 11 < 8 < 7 < 28 < 8 < 51 09/12/18 1207 +/- 154 < 6 < 7 < 16 < 7 < 20 < 7 < 10 < 7 < 8 < 36 < 10 < 54 09/26/18 1262 +/- 185 < 8 < 8 < 17 < 8 < 19 < 9 < 16 < 9 < 7 < 33 < 11 < 51 10/10/18 1154 +/- 149 < 6 < 6 < 12 < 7 < 17 < 8 < 14 < 7 < 7 < 36 < 10 < 49 10/24/18 1118 +/- 112 < 5 < 6 < 13 < 7 < 14 < 6 < 9 < 6 < 6 < 24 < 7 < 39 11/28/18 1063 +/- 196 < 6 < 8 < 13 < 8 < 16 < 8 < 11 < 8 < 7 < 27 < 12 < 45 12/26/18 1026 +/- 144 < 7 < 7 < 17 < 7 < 14 < 7 < 11 < 8 < 6 < 39 < 11 < 45 MEAN 1129 +/- 252 THE MEAN AND TWO STANDARD DEVIATION ARE CALCULATED USING THE POSITIVE VALUES

Table C-IX.1 CONCENTRATIONS OF GAMMA EMITIERS IN VEGETATION SAMPLES COLLECTED IN THE VICINITY OF CLIN,_TON POWER STATiON, 2018 RESULTS IN UNITS OF PCI/KG WET+/- 2 SIGMA COLLECTION SITE E_E_8.lQ_D Mn-54 Co-58 Fe-59 Co-60 Zn-65 r,,/b-95 Zr-95 1-131 Cs-_1_34_ C_s~~7 Ba-140 L,i-140 Ce-_14<i

.CL-114

~Cabbage 06/27/18 < 23 < 21 <ITT <25 <~ < 28 <~ <49 <~ < 27 < 96 < 36 < 126 Kale/Swiss Chard 06/27/18 < 9 < 10 <~ <10 <~ < 10 <18 < 21 <11 < 11 < 54 < 13 < 66 Lettuce 06/27/18 < 34 < 25 <~ <45 <ro < 29 <Q < 58 <M < 32 < 142 < 34 < 169 Cabbage 07/25/18 < 27 <25 <~ <27 <~ < 37 <~ <45 <~ < 29 < 142 < 37 < 207 Cabbage/Lettuce 07/25/18 < 30 < 39 <ro < 31 <~ < 38 <~ < 58 <~ < 31 < 174 < 44 < 249 Cabbage/Swiss Chard 07/25/18 < 32 < 31 <M <34 <W < 30 <~ <45 <M < 36 < 128 < 36 < 191 Cabbage 08/29/18 < 31 < 34 <~ <35 <W < 38 <W < 58 <~ < 28 < 155 < 49 < 199 Cabbage/Weeds 09/26/18 < 19 < 21 <m <22 <~ < 20 <~ < 50 <~ < 22 < 119 < 36 < 127 MEAN CL-115 Com 06/27/18 < 31 < 34 <60 <32 <62 < 33 <46 < 55 < 31 < 29 < 163 < 50 < 210 Com Leaves 07/25/18 < 24 < 29 <57 <29 <50 < 25 < 46 < 50 <25 < 28 < 129 < 38 < 193 Com Leaves 08/29/18 < 26 <23 <46 <26 <70 < 28 < 43 < 50 <29 < 21 < 118 < 37 < 164 Com 09/26/18 < 16 < 16 <36 <15 <35 < 15 <28 < 38 <15 < 16 <93 < 20 < 94 MEAN CL-117 Cabbage 06/27/18 < 25 < 27 <W < 31 <M <~ < 51 <~ <23 < 29 < 143 < 46 < 167

~ Lettuce 06/27/18 < 34 < 31 <~ <33 <~ <~ < 53 <<< <26 < 24 < 139 < 43 < 170 CD Swiss Chard 06/27/18 < 35 < 32 <n <27 <~ <M <46 <~ <29 < 38 < 161 < 33 < 179 Cabbage 07/25/18 < 35 < 26 <~ <26 <W <~ <44 <~ <32 < 25 < 154 < 28 < 164 Kale 07/25/18 < 27 < 22 <~ <25 <~ <~ < 55 <Q < 31 < 31 < 120 < 36 < 157 Swiss Chard 07/25/18 < 33 < 27 <~ <43 <~ <~ < 56 <m <40 < 35 < 165 < 53 < 193 Cabbage 08/29/18 < 33 < 25 <~ <37 <N <~ < 59 <M <29 < 30 < 146 < 43 < 186 Kale 08/29/18 < 27 < 23 <~ <28 <ITT <U < 53 <m <37 < 33 < 141 < 46 < 192 Swiss Chard 08/29/18 < 20 <18 <~ <21 <~ <~ < 37 <~ <23 < 23 < 91 < 28 < 129 Cabbage 09/26/18 < 22 < 23 <~ <26 <~ <M <45 <W <27 < 28 < 136 < 35 < 155 Kale 09/26/18 < 15 < 16 <~ <16 <~ <16 < 33 <~ <19 < 17 <92 < 27 < 104 Swiss Chard 09/26/18 < 19 <24 <~ <23 <Q <~ <40 <~ <25 < 23 <136 < 37 < 135 MEAN CL-118 Weeds 06/27/18 < 29 < 32 <82 <24 <74 <34 < 57 < 59 <37 < 25 <148 < 36 < 172 Weeds 07/25/18 < 34 < 27 < 66 <31 <76 <32 < 58 <47 <39 < 34 < 166 < 43 < 188 Weeds 08/29/18 < 30 < 30 <68 <35 <64 <37 < 49 < 46 <35 < 23 < 161 < 54 < 173 Weeds 09/26/18 < 23 < 24 <49 <23 <50 < 24 < 39 < 58 <25 < 23 < 126 < 35 < 145 MEAN

Table C-IX.2 CONCENTRATIONS OF GAMMA EMITTERS IN GRASS SAMPLES COLLECTED IN THE VICINITY OF CLINTON POWER STATION, 2018 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 05/09/18 < 30 < 33 < 73 < 29 < 81 < 29 < 52 < 49 < 29 < 28 < 149 < 35 < 185 05/23/18 < 25 < 25 < 48 < 25 < 58 < 25 < 45 < 59 < 28 < 25 < 137 < 41 < 128 06/06/18 < 33 < 35 < 74 < 37 < 76 < 35 < 55 < 54 < 43 < 42 < 169 < 52 < 207 06/20/18 < 37 < 31 < 76 < 35 < 51 < 38 < 64 < 47 < 46 < 25 < 129 < 50 < 193 07/04/18 < 24 < 25 < 65 < 27 < 56 < 23 < 39 < 32 < 26 < 29 < 101 < 35 < 138 07/18/18 < 39 < 29 < 70 < 29 < 66 < 31 < 56 < 52 < 32 < 29 < 136 < 37 < 197 08/01/18 < 30 < 24 < 58 < 23 < 61 < 27 < 40 < 43 < 24 < 24 < 123 < 30 < 155 08/15/18 < 28 < 23 < 54 < 24 < 47 < 27 < 40 < 43 < 25 < 24 < 116 < 31 < 168 08/29/18 < 23 < 24 < 50 < 23 < 54 < 30 < 38 < 50 < 27 < 25 < 127 < 36 < 163 09/12/18 < 30 < 27 < 71 < 27 < 71 < 29 < 51 < 57 < 35 < 27 < 136 < 36 < 181 09/26/18 < 20 < 23 < 44 < 26 < 51 < 22 < 42 < 59 < 22 < 19 < 124 < 39 < 121 10/10/18 < 20 < 19 < 45 < 21 < 45 < 21 < 42 < 57 < 23 < 21 < 129 < 42 < 136 0 10/24/18 < 28 < 29 < 57 < 25 < 50 < 24 < 51 < 48 < 26 < 27 < 104 < 28 < 169 N

0 MEAN CL-02 05/09/18 < 30 < 32 < 72 < 35 < 65 < 24 < 53 < 49 < 30 < 30 < 131 < 40 < 154 05/23/18 < 27 < 24 < 56 < 23 < 47 < 23 < 46 < 54 < 28 < 26 < 150 < 37 < 137 06/06/18 < 35 < 32 < 85 < 38 < 78 < 40 < 69 < 59 < 43 < 42 < 178 < 40 < 230 06/20/18 < 31 < 27 < 72 < 29 < 65 < 25 < 58 < 35 < 33 < 25 < 113 < 39 < 160 07/04/18 < 29 < 25 < 63 < 30 < 65 < 27 < 42 < 36 < 30 < 25 < 115 < 40 < 190 07/18/18 < 31 < 29 < 66 < 33 < 56 < 33 < 56 < 55 < 31 < 33 < 139 < 39 < 219 08/01/18 < 32 < 28 < 63 < 35 < 70 < 32 < 53 < 50 < 33 < 28 < 128 < 33 < 158 08/15/18 < 34 < 39 < 78 < 37 < 83 < 37 < 67 < 60 < 38 < 31 < 142 < 45 < 233 08/29/18 < 28 < 25 < 61 < 31 < 70 < 23 < 46 < 57 < 28 < 27 < 148 < 52 < 171 09/12/18 < 30 < 30 < 63 < 31 < 64 < 34 < 55 < 58 < 34 < 34 < 159 < 44 < 196 09/26/18 < 19 < 18 < 44 < 21 < 40 < 22 < 32 < 52 < 20 < 21 < 121 < 37 < 126 10/10/18 < 22 < 22 < 44 < 23 < 54 < 20 < 43 < 58 < 24 < 21 < 138 < 44 < 139 10/24/18 < 29 < 25 < 70 < 24 < 62 < 26 < 50 < 55 < 31 < 32 < 120 < 28 < 190 MEAN

Table C-IX.2 CONCENTRATIONS OF GAMMA EMITTERS IN GRASS SAMPLES COLLECTED IN THE VICINITY OF CLINTON POWER STATION, 201°8 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 05/09/18 < 30 < 26 < 67 < 31 < 79 < 31 < 55 < 43 < 30 < 27 < 112 < 35 < 175 05/23/18 < 17 < 18 < 47 < 16 < 43 < 19 < 34 < 51 < 21 < 20 < 95 < 21 < 118 06/06/18 < 38 < 38 < 87 < 43 < 98 < 36 < 75 < 48 < 45 < 44 < 167 < 58 < 163 06/20/18 < 14 < 14 < 29 < 15 < 30 < 15 < 25 < 22 < 16 < 15 < 65 < 19 < 84 07/04/18 < 36 < 24 < 78 < 24 < 53 < 27 < 50 < 42 < 24 < 33 < 127 < 42 < 178 07/18/18 < 28 < 31 < 77 < 34 < 88 < 38 < 52 < 50 < 36 < 35 < 120 < 40 < 173 08/01/18 < 34 < 34 < 67 < 35 < 78 < 30 < 50 < 54 < 32 < 31 < 150 < 29 < 183 08/15/18 < 31 < 31 < 75 < 33 < 87 < 27 < 56 < 56 < 31 < 39 < 158 < 38 < 207 08/29/18 < 26 < 25 < 62 < 28 < 58 < 31 < 50 < 57 < 32 < 28 < 154 < 44 < 165 09/12/18 < 27 < 20 < 52 < 27 < 54 < 23 < 45 < 43 < 25 < 25 < 108 < 35 < 141 09/26/18 < 19 < 20 < 40 < 21 < 47 < 24 < 38 < 58 < 20 < 21 < 126 < 34 < 125 10/10/18 < 10 < 11 < 27 < 11 < 24 < 12 < 19 < 33 < 12 < 11 < 73 < 20 < 62

()

10/24/18 < 32 < 28 < 76 < 31 < 83 < 28 < 55 < 54 < 38 < 35 < 134 < 26 < 205

~

MEAN CL-116 05/09/18 < 29 < 38 < 75 < 29 < 72 < 36 < 54 < 52 < 37 < 33 < 166 < 29 < 235 05/23/18 < 24 < 26 < 48 < 28 < 50 < 25 < 41 < 59 < 25 < 22 < 149 < 42 < 135 06/06/18 < 39 < 39 < 88 < 42 < 97 < 37 < 68 < 55 < 48 < 39 < 173 < 42 < 267 06/20/18 < 31 < 31 < 66 < 45 < 78 < 34 < 55 < 57 < 37 < 33 < 146 < 28 < 237 07/04/18 < 26 < 27 < 62 < 32 < 70 < 30 < 45 < 36 < 34 < 31 < 112 < 33 < 165 07/18/18 < 28 < 33 < 61 < 30 < 67 < 26 < 42 < 54 < 32 < 29 < 140 < 29 < 208 08/01/18 < 30 < 28 < 72 < 32 < 72 < 26 < 47 < 51 < 36 < 26 < 129 < 38 < 182 08/15/18 < 31 < 36 < 79 < 36 < 82 < 33 < 60 < 57 < 34 < 31 < 128 < 26 < 189 08/29/18 < 25 < 29 < 67 < 24 < 74 < 32 < 55 < 59 < 37 < 32 < 160 < 48 < 193 09/12/18 < 25 < 30 < 69 < 31 < 63 < 31 < 53 < 51 < 32 < 28 < 145 < 44 < 187 09/26/18 < 20 < 20 < 45 < 21 < 48 < 18 < 34 < 52 < 21 < 19 < 118 < 31 < 111 10/10/18 < 21 < 21 < 49 < 24 < 47 < 24 < 39 < 59 < 24 < 24 < 128 < 29 < 124 10/24/18 < 31 < 30 < 74 < 31 < 71 < 32 < 49 < 54 < 35 < 27 < 155 < 23 < 211 MEAN

Table C-X.1 QUARTERLY DLR RESULTS FOR CLINTON POWER STATION, 2018 RESULTS IN UNITS OF MILLI REM/QUARTER+/- 2 STANDARD DEVIATIONS STATION MEAN CODE +/-2S.D. JAN- MAR APR-JUN JUL-SEP OCT-DEC CL-01 18.1 +/- 1.6 17.8 17.4 18.0 19.3 CL-02 18.7 +/- 0.4 18.5 18.6 19.0 18.6 CL-03 18.5 +/- 0.6 18.1 18.8 18.5 18.7 CL-04 18.4 +/- 1.1 17.8 18.1 18.8 19.0 CL-05 19.0 +/- 2.0 19.3 18.6 20.2 17.8 CL-06 16.6 +/- 1.0 16.2 16.2 17.2 16.7 CL-07 17.0 +/- 1.3 17.0 16.1 17.4 17.6 CL-08 18.2 +/- 1.5 18.4 17.9 19.2 17.4 CL-11 17.2 +/- 0.9 17.4 16.6 17.0 17.6 CL-15 16.5 +/- 0.7 16.5 16.9 16.6 16.0 CL-22 19.7 +/- 0.7 19.3 19.6 20.1 19.7 CL-23 20.2 +/- 1.8 19.9 21.4 20.2 19.3 CL-24 19.9 +/- 0.6 19.5 19.7 20.1 20.1 CL-33 19.4 +/- 1.0 19.7 19.9 19.0 18.9 CL-34 18.1 +/- 1.6 17.0 18.2 18.7 18.6 CL-35 18.2 +/- 2.3 (1) 17.0 19.3 18.2 CL-36 18.7 +/- 2.2 17.8 18.1 20.3 18.6 CL-37 18.0 +/- 0.7 17.9 17.5 18.4 18.0 CL-41 20.2 +/- 1.5 19.4 19.9 21.2 20.4 CL-42 18.5 +/- 1.7 18.1 19.1 19.3 17.5 CL-43 21.2 +/- 5.0 20.3 19.8 24.9 19.7 CL-44 18.4 +/- 1.2 17.7 18.1 18.6 19.1 CL-45 20.3 +/- 2.3 18.8 20.3 21.5 20.7 CL-46 18.6 +/- 1.1 18.5 18.4 18.1 19.4 CL-47 19.8 +/- 1.6 19.3 19.0 20.8 20.0 CL-48 19.3 +/- 0.9 18.7 19.2 19.8 19.3 CL-49 19.4 +/- 1.7 19.4 18.8 20.5 18.7 CL-51 19.9 +/- 2.3 20.4 18.5 21.1 19.4 CL-52 19.6 +/- 1.3 18.9 20.0 20.3 19.3 CL-53 17.5 +/- 1.4 17.1 17.2 18.6 17.2 CL-54 20.2 +/- 1.1 20.0 19.7 21.0 20.0 CL-55 19.5 +/- 2.9 17.9 19.0 19.7 21.4 CL-56 20.2 +/- 0.7 19.7 20.5 20.2 20.3 CL-57 20.2 +/- 1.0 20.1 20.3 20.8 19.6 CL-58 20.1 +/- 1.4 19.0 20.2 20.4 20.6 CL-60 19.8 +/- 0.6 19.4 19.6 19.9 20.1 CL-61 18.6 +/- 2.2 17.4 18.2 20.0 18.9 CL-63 16.9 +/- 0.2 16.8 16.9 16.9 17.0 CL-64 18.4 +/- 1.7 18.3 19.3 17.3 18.7 CL-65 19.8 +/- 1.1 20.1 19.0 19.9 20.2 CL-74 16.9 +/- 0.9 16.9 16.2 17.1 17.2 CL-75 18.7 +/- 0.9 18.5 18.2 19.3 18.6 CL-76 18.7 +/- 2.5 18.5 17.0 19.9 19.2 CL-77 17.9 +/- 1.5 17.7 17.0 18.8 18.2 CL-78 18.0 +/- 0.6 17.7 17.7 18.2 18.2 CL-79 18.7 +/- 1.6 17.8 18.5 19.7 18.8 CL-80 18.9 +/- 2.1 17.9 18.7 18.5 20.4 CL-81 19.7 +/- 2.1 18.4 20.0 20.9 19.3 CL-84 18.9 +/- 0.9 18.5 18.7 19.5 18.8 CL-90 14.9 +/- 0.8 14.9 14.6 15.5 14.7 CL-91 17.6 +/- 1.6 16.7 17.7 18.6 17.3 CL-97 19.5 +/- 2.1 18.0 20.2 19.7 20.2 CL-99 15.2 +/- 0.4 15.3 15.1 15.4 14.9 CL-114 18.6 +/- 2.6 18.3 18.5 20.3 17.1 (1) SEE PROGRAM EXCEPTIONS SECTION FOR EXPLANATION C-22

TABLE C-X.2 MEAN QUARTLY DLR RESULTS FOR THE INNER RING, OUTER RING, SPECIAL INTEREST SUPPLEMENTAL AND CONTROL LOCATIONS FOR CLINTON POWER STATION, 2018 RESULTS IN UNITS OF MILLIREM/QUARTER +/- 2 STANDARD DEVIATIONS OF THE STATION DATA COLLECTION INNER RING PERIOD +/-2 S.D. OUTER RING SPECIAL INTEREST SUPPLEMENTAL CONTROL JAN-MAR 18.6 +/- 2.1 18.6 +/- 2.1 18.6 +/- 2.2 17.4 +/- 2.7 . 17.4 +/- 0 APR-JUN 18,8 +/- 2.4 18.9 +/- 2.4 18.4 +/- 2.5 17.7 +/- 3.4, 16.6 +/- 0 JUL-SEP 19.8 +/- 3.6 19.9 +/- 1.8 19.1 +/- 3.1 18.2 +/- 3.1 17.0 +/- 0 OCT-DEC 19.0 +/- 2.0 19.4 +/- 2.1 18.8 +/- 2.3 17.6 +/- 3.2 17.6 +/- 0 TABLE C-X.3

SUMMARY

OF THE AMBIENT DOSIMETRY PROGRAM FOR CLINTON POWER STATION, 2018 RESULTS IN UNITS OF MILLI REM/QUARTER+/- 2 STANDARD DEVIATION SAMPLES PERIOD PERIOD PERIOD MEAN PRE-OP MEAN LOCATION ANALYZED MINIMUM MAXIMUM +/-2 S.D. +/- 2 S.D, ALL LOCATIONS INNER RING 63 16.8 24.9 19.1 +/- 2.7 OUTER RING 64 17.0 21.4 19.2 +/- 2.3 18.0 +/- 2.4 SPECIAL INTEREST 28 16.2 21.2 18.7 +/- 2.5 SUPPLEMENTAL 56 14.6 20.3 17.7 +/- 3.1 CONTROL 4 16.6 17.6 17.2 +/- 0.9 INNER RING STATIONS - CL-01, CL-05, CL-22, CL-23, CL-24, CL-34, CL-35, CL-36, CL-42, CL-43, CL-44, CL-45, CL-46, CL-47, CL-48, CL-63 OUTER RING STATIONS - CL-51, CL-52, CL-53, CL-54, CL-55, CL-56, CL-57, CL-58, CL-60, CL-61, CL-76, CL-77, CL-78, CL-79, CL-80, CL-81 SPECIAL INTEREST STATIONS- CL-37, CL-41, CL-49, CL-64, CL-65, CL-74, CL-75 SUPPLEMENTAL STATIONS - CL-02, CL-03, CL-04, CL-06, CL-07, CL-08, CL-114, CL-15, CL-33, CL-84, CL-90, CL-91, CL-97, CL-99 CONTROL STATIONS - CL-11 C-23

FIGURE C-1 MEAN MONTHLY GROSS BETA CONCENTRATION IN AIR PARTICULATE SAMPLES COLLECTED IN THE VICINITY OF CPS, 2018 0.052 0.047 0.042 "E'

0.037 0.032

(.)

~

a..

0.027 j::

0.022

(.)

<(

0.017 0.012 0.007 MONTH Ill!; 'II PRE-OP (ALL SITES)

-A- 2018 INDICATOR

~ 2018 CONTROL C-24

FIGURE C-2 MEAN QUARTERLY AMBIENT GAMMA RADIATION LEVELS (DLR) IN THE VICINITY OF CPS, 2018 50 45 40 35 E

a:: 30 Q)

E 25 20 15 10

PRE-OP o 2018 indicator

2018 control C-25

_j

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 ofTBE to Month/Year Matrix Nuclide Units Reported Evaluation (bl Number Value (a) Analytics Result Value March 2018 E12133 Milk Sr-89 pCi/L 76.1 90.1 0.84 A Sr-90 pCi/L 12.2 12.5 0.98 A E12134 Milk Ce-141 pCi/L 77.8 77.0 1.01 A Co-58 pCi/L 105 114 0.92 A Co-60 pCi/L 181 187 0.97 A Cr-51 pCi/L 298 326 0.92 A Cs-134 pCi/L 150 180 0.84 A Cs-137 pCi/L 164 172 0.95 A Fe-59 pCi/L 140 139 1.01 A 1-131 pCi/L 105 108.0 0.97 A Mn-54 pCi/L 133 131 1.01 A Zn-65 pCi/L 242 244 0.99 A E12135 Charcoal 1-131 pCi 93.7 95.4 0.98 A E12136 AP Ce-141 pCi 92.6 85.3 1.09 A Co-58 pCi 130 126 1.03 A Co-60 pCi 237 207 1.14 A Cr-51 pCi 411 361 1.14 A Cs-134 pCi 194 199 0.98 A Cs-137 pCi 200 191 1.05 A Fe-59 pCi 160 154 1.04 A Mn-54 pCi 152 145 1.05 A Zn-65 pCi 267 271 0.99 A E12137 Water Fe-55 pCi/L 1990 1700 1.17 A E12138 Soil Ce-141 pCi/g 0.148 0.118 1.26 w Co-58 pCi/g 0.171 0.174 0.98 A Co-60 pCi/g 0.297 0.286 1.04 A Cr-51 pCi/g 0.537 0.498 1.08 A Cs-134 pCi/g 0.274 0.275 1.00 A Cs-137 pCi/g 0.355 0.337 1.05 A Fe-59 pCi/g 0.243 0.212 1.15 A Mn-54 pCi/g 0.228 0.201 1.14 A Zn-65 pCi/g 0.395 0.374 1.06 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 of0.80-1.20 W = Acceptable with warning - reported result falls within 0. 70-0.80 or 1.20-1.30 N = Not Acceptable - reported result falls outside the ratio limits of< 0. 70 and> 1.30 (Page 1 of 4)

D-1

\

Analytics Environmental Radioactivity Cross Check Program TABLE D.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 June 2018 E12205 Milk Sr-89 pCi/L 74.9 84.6 0.89 A Sr-90 pCi/L 10.5 11.4 0.92 A E12206 Milk Ce-141 pCi/L 89.2 82.2 1.08 A Co-58 pCi/L 94.8 89 1.07 A Co-60 pCi/L 125 113 1.10 A Cr-51 pCi/L 256 239 1.07 A Cs-134 pCi/L 112 114 0.99 A Cs-137 pCi/L 107 98.8 1.08 A Fe-59 pCi/L 95.9 86.0 1.12 A 1-131 pCi/L 69.8 71.9 0.97 A Mn-54 pCi/L 138 130 1.06 A Zn-65 pCi/L 186 157 1.18 A E12207 Charcoal 1-131 pCi 69.6 72.2 0.96 A E12208 AP Ce-141 pCi 151 165 0.92 A Co-58 pCi 174 178 0.98 A Co-60 pCi 290 227 1.28 w Cr-51 pCi 452 478 0.95 A Cs-134 pCi 215 227 0.95 A Cs-137 pCi 206 198 1.04 A Fe-59 pCi 180 172 1.05 A Mn-54 pCi 265 260 to2 A Zn-65 pCi 280 315 0.89 A E12209 Water Fe-55 pCi/L 1790 1740 1.03 A E12210 AP Sr-89 pCi 77.8 90.3 0.86 A Sr-90 pCi 9.54 12.2 0.78 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 2 of 4)

D-2

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 September 2018 E12271 Milk Sr-89 pCi/L 79.4 81.7 0.97 A Sr-90 pCi/L 12.2 14.8 0.82 A E12272 Milk Ce-141 pCi/L 152 128 1.19 A Co-58 pCi/L 161 144 1.12 A Co-60 pCi/L 208 190 1.10 A Cr-51 pCi/L 244 265 0.92 A Cs-134 pCi/L 124 123 1.01 A Cs-137 pCi/L 166 147 1.13 A Fe-59 pCi/L 158 119 1.32 N(1l 1-131 pCi/L 83.1 58.2 1.43 N(2l Mn-54 pCi/L 191 167 1.14 A Zn-65 pCi/L 229 201 1.14 A E12273 Charcoal 1-131 pCi 83.0 80.7 1.03 A E12274 AP Ce-141 pCi 101 85.6 1.18 A Co-58 pCi 92.7 96.0 0.97 A Co-60 pCi 142 127 1.12 A Cr-51 pCi 218 177 1.23 w Cs-134 pCi 81.2 81.9 0.99 A Cs-137 pCi 99.0 98.5 1.01 A Fe-59 pCi 93.7 79.7 1.18 A Mn-54 pCi 116 112 1.04 A Zn-65 pCi 139 134 1.04 A E12302 Water Fe-55 pCi/L 2120 1820 1.17 A E12276 Soil Ce-141 pCi/g 0.259 0.221 1.17 A Co-58 pCi/g 0.279 0.248 1.12 A Co-60 pCi/g 0.367 0.328 1.12 A Cr-51 pCi/g 0.597 0.457 1.31 N (3l Cs-134 pCi/g 0.261 0.212 1.23 w Cs-137 pCi/g 0.376 0.330 1.14 A Fe-59 pCi/g 0.248 0.206 1.20 A Mn-54 pCi/g 0.317 0.289 1.10 A Zn-65 pCi/g 0.407 0.347 1.17 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 18-20 (2) See NCR 18-24 (3) See NCR 18-21 (Page 3 of 4)

D-3

Analytics Environmental Radioactivity Cross Check Program TABLE D.1 Teledyne Brown Engineering Environmental Services TSE Identification Known Ratio ofTBE to Month/Year Matrix Nuclide Units Reported Evaluation (b)

Number Value (a) Analytics Result Value December 2018 E12313 Milk Sr-89 pCi/L 71.9 91.9 0.78 w Sr-90 pCi/L 12.1 13.3 0.91 A*

E12314 Milk Ce-141 pCi/L 124 133 0.93 A Co-58 pCi/L 110 119 0.93 A Co-60 pCi/L 202 212 0.95 A Cr-51 pCi/L 292 298 0.98 A Cs-134 pCi/L 146 171 0.85 A Cs-137 pCi/L 118 121 n.98 A Fe-59 pCi/L 120 114 1.05 A 1-131 pCi/L 94.2 93.3 1.01 A Mn-54 pCi/L 151 154 0.98 A Zn-65 pCi/L 266 264 1.01 A E12315 Charcoal 1-131 pCi 94.8' 89.9 1.05 A E12316A AP Ce-141 pCi 92.3 94.0 0.98 A Co-58 pCi 73.4 83.8 0.88 A Co-60 pCi 137 150 0.91 A Cr-51 pCi 202 210 0.96 A Cs-134 pCi 115 121 0.95 A Cs-137 pCi 85.0 85.4 1.00 A Fe-59 pCi 83.1 80.8 1.03 A Mn-54 pCi 104 109 0.96 A Zn-65 pCi 168 187 0.90 A E12317 Water Fe-55 pCi/L 2110 1840 1.15 A E12318 AP Sr-89 pCi 81.1 83.0 .0.98 A Sr-90 pCi 11.4 12.0 0.95 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 of0.80-1.20 W = Acceptable with warning- reported result falls within 0.70-0.80 or 1.20-1.30 N = Not Acceptable - reported result falls outside the ratio limits of< 0. 70 and > 1. 30 (Page 4 of 4)

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DOE's Mixed Analyte Performance Evaluation Program (MAPEP)

TABLE D.2 Teledyne Brown Engineering Environmental Services TSE Identification Known Acceptance Month/Year Matrix Nuclide Units Reported Evaluation (bl Number Value (a) Range Value February 2018 18-MaS38 Soil Ni-63 Bq/kg 9.94 (1) A Sr-90 Bq/kg 0.846 (1) A 18-MaW38 Water Am-241 Bq/L 0.785 0.709 0.496 - 0.922 A Ni-63 Bq/L 12.6 14.0 9.8 -18.2 A Pu-238 Bq/L 0.0214 0.023 (2) A Pu-239/240 Bq/L 0.544 0.600 0.420 - 0.780 A 18-RdF38 AP U-234/233 Sq/sample 0.111 0.. 124 0.087 - 0.161 A U-238 Sq/sample 0.123 0.128 0.090- 0.166 A 18-RdV38 Vegetation Cs-134 Sq/sample 2.46 3.23 2.26 - 4.20 w Cs-137 Sq/sample 3.14 3.67 2.57 -4.77 A Co-57 Sq/sample 4.12 4.42 3.09 - 5.75 A Co-60 Sq/sample 1.86 2.29 1.60 - 2.98 A Mn-54 Sq/sample 2.21 2.66 1.86 - 3.46 A Sr-90 Sq/sample NR(3l Zn-65 Sq/sample -0.201 (1) A November 2018 18-MaS39 Soil Ni-63 Bq/kg 703 765 536 - 995 A Sr-90 Bq/kg 137 193 135 - 251 w 18-MaW39 Water Am-241 Bq/L 0.0363 (1) A Ni-63 Bq/L 6.18 7.0 4.9- 9.1 A Pu-238 Bq/L 0.73 0.674 0.472 - 0.876 A Pu-239/240 Bq/L 0.89 0.928 0.650 - 1.206 A 18-RdF39 AP U-234/233 Sq/sample 0.159 0.152 0.106- 0.198 A U-238 Sq/sample 0.162 0.158 0.111 - 0.205 A 18-RdV39 Vegetation Cs-134 Sq/sample 1.85 1.94 1.36- 2.52 A Cs-137 Sq/sample 2.5 2.36 1.65- 3.07 A Co-57 Sq/sample 3.53 3.31 2.32-4.30 A Co-60 Sq/sample 1.6 1.68 1.18-2.18 A Mn-54 Sq/sample 2.61 2.53 1.77 - 3.29 A Sr-90 Sq/sample 0.338 0.791 0.554 - 1.028 N(4l Zn-65 Sq/sample 1.32 1.37 0.96-1.78 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 (1) False positive test (2) Sensitivity evaluation (3) See NCR 18-09 (4) See NCR 18-25 (Page 1 of 1)

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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 (b)

Number Value(*> Limits Value March 2018 MRAD-28 AP GR-A pCi/sample 65.7 43.4 22.7-71.5 A GR-8 pCi/sample 57.2 52 31.5- 78.6 A April 2018 RAD-113 Water Ba-133 pCi/L 91.2 91.5 77.1-101 A Cs-134 pCi/L 70.4 75.9 62.0- 83.5 A Cs-137 pCi/L 122 123 111 - 138 A Co-60 pCi/L 64.8 64.3 57.9 - 73.2 A Zn-65 pCi/L 98.6 86.7 78.0 -104 A GR-A pCi/L 32.8 28.6 14.6 - 37.5 A GR-8 pCi/L 62.9 73.7 51.4- 81.1 A U-Nat pCi/L 6.7 6.93 5.28- 8.13 A H-3 pCi/L 17100 17200 15000 - 18900 A Sr-89 pCi/L 38.6 48.8 38.3 - 56.2 A Sr-90 pCi/L 27.1 26.5 19.2 - 30.9 A 1-131 pCi/L 26.7 24.6 20.4 - 29.1 A September 2018 MRAD-29 AP GR-A pCi/sample 49.7 55.3 28.9 - 91.1 A AP GR-8 pCi/sample 75.3 86.5 52.4 -131 A October 2018 RAD-115 Water Ba-133 pCi/L 15.2 16.3 11.9 - 19.4 A Cs-134 pCi/L 85.9 93.0 76.4 -102 A Cs-137 pCi/L 229 235 212 - 260 A Co-60 pCi/L 81.9 80.7 72.6- 91.1 A Zn-65 pCi/L 348 336 302 - 392 A GR-A pCi/L 38.9 60.7 31.8-75.4 A GR-8 pCi/L 36.5 41.8 27.9 - 49.2 A U-Nat pCi/L 17.48 20.9 16.8 - 23.4 A H-3 pCi/L 2790 2870 2410 - 3170 A 1-131 pCi/L 26.9 27.2 22.6 - 32.0 A Sr-89 pCi/L 57.2 56.9 45.5 - 64.6 A Sr-90 pCi/L 36.8 31.4 22.9- 36.4 N(1)

(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 18-23 (Page 1 of 1)

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APPENDIX E ERRATA DATA

Intentionally left blank There was no errata data for 2018 Intentionally left blank APPENDIX F ANNUAL RADIOLOGICAL GROUNDWATER PROTECTION PROGRAM REPORT (ARGPPR)

Intentionally left blank J

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 Ill. Program Description ...................................................................................................... 5 A. Sample Analysis .................................................................................................. 5 B. Data Interpretation ............................................................................................... 6 C. Background Analysis ........................................................................................... 7

1. Background Concentrations of Tritium ..................................................... 7 IV. Results and Discussion ................................................................................................. 9 A. Program Exceptions .......................................................,..................................... 9 B. Program Changes ............................................................................................. 1O C. Groundwater Results ........................................................................................ 1O 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 ................................................................................ 12 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, 2018 Figures Figure A-1 Onsite Sampling Locations at Clinton Power Station Figure A-2 Sampling Locations South of Clinton Power Station Figure A-3 Sampling Locations East of Clinton Power Station Figure A-4 Recapture Sampling Locations of Clinton Power Station Appendix B Data Tables of the Annual Radiological Groundwater Protection Program Report (ARGPPR)

Tables Table B-1.1 Concentrations of Tritium, Strontium, Gross Alpha, and Gross Beta in Groundwater Samples Collected in the Vicinity of Clinton Power Station, 2018 Table B-1.2 Concentrations of Gamma Emitters in Groundwater Samples Collected in the Vicinity of Clinton Power Station, 2018 Table B-1.3 Concentrations of Hard To Detects in Groundwater Samples Collected in the Vicinity of Clinton Power Station, 2018 Table B-11.1 Concentrations of Tritium in Surface Water Samples Collected in the Vicinity of Clinton Power Station, 2018 Table B-11.2 Concentrations of Gamma Emitters in Surface Water Samples Collected in the Vicinity of Clinton Power Station, 2018 Table B-111.1 Concentrations of Tritium in Precipitation Water Samples Collected in the Vicinity of Clinton Power Station, 2018 ii

I. Summary and Conclusions In 2006, Exelon instituted a comprehensive program to evaluate the impact of station operations on groundwater and surface water in the vicinity of Clinton Power Station (CPS). This evaluation involved numerous station personnel and contractor support personnel. This report covers groundwater and surface water samples, collected outside of the Licensee required Off-Site Dose Calculation Manual (ODCM) requirements, both on and off station property in 2018. During that time period, 236 analyses were performed on 102 samples from 33 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 2018.

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 laboralory 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 five of seventeen groundwater monitoring locations. The tritium concentrations ranged from 245 +/- 122 pCi/L to 840 +/- 151 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 2018. Gross Alpha (dissolved and suspended) was not detected at any of the groundwater locations. Gross Beta (dissolved) was detected in twelve of seventeen groundwater locations. The concentrations ranged from 1.9 to 17.6 pCi/L. Gross Beta (suspended) was not detected at any of the groundwater locations.

Hard-To-Detect analyses were performed on two 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 0.64 +/- 0.25 pCi/L and 0.63 +/- 0.25 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 2018.

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:

~I

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

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

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

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

5. Clinton Power Station staff and consulting hydrogeologist assess analytical results on an ongoing basis to identify adverse trends.

C. Program Description

1. Sample Collection Sample locations can be found in Table A-1 and Figures A-1, A-2, A-3, and A-4 Appendix A.

Groundwater, Surface Water and Precipitation Water Samples of water are collected, managed, transported and analyzed in accordance with approved procedures following regulatory methods. Groundwater, surface water, and precipitation water are collected. Sample locations, sample collection frequencies and analytical frequencies are controlled in accordance with approved station procedures. Contractor and/or station personnel are trained in the collection, preservation management, and shipment of samples, as well as in documentation of sampling events. Analytical laboratories are subject to internal quality assurance programs and inter-laboratory cross-check programs, as well as nuclear industry audits. Station personnel review and evaluate all analytical data deliverables after initial review by the contractor.

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

D. Characteristics of Tritium (H-3)

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

Tritiated water behaves the same as ordinary water in both 1the 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 2018. 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 IR 4188917 RGPP: Vendor Failed to Reach LLD per EN-AA-408-4000:

Table 1 in Attachment 5 of EN-AA-408-4000 indicates the LLD for the annual dissolved gross alpha in Clinton's Monitoring Wells to be 3 pCi/L. The sampling and analysis of dissolved gross alpha in the Monitoring Wells is contracted out to Teledyne Brown Engineering (TBE). TBE identified a discrepancy during their review of the analytical results from 3Q18 and not~fied the station that they could not .

reach EN-AA-408-4000's MDC in Monitoring Well MW-CL-19S due to high solid content in the samples. The vendor extended the count time to 200 minutes to achieve the lowest possible MDC, but were only capable of obtaining a MDC of 4.38E+OO pCi/L.

2. Missed Samples There were no missed samples in 2018.

B. Program Changes There were no program changes in 2018.

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 (Table 8-1.1 Appendix 8). Tritium values ranged from below the Exelon-imposed LLD of 200 pCi/1 to 840 pCi/1.

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 8-1.1 Appendix 8)

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 2018. Gross Alpha (dissolved and suspended) was not detected at any of the groundwater locations. Gross Beta (dissolved) was detected in twelve of seventeen groundwater locations. The concentrations ranged from 1.9 to 17.6 pCi/L. Gross Beta (suspended) was not detected at any of the groundwater locations.

(Table 8-1.1 Appendix B)

Gamma Emitters No plant-produced radionuclides were detected.

(Table 8-1.2, 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 (Table B-11.1 Appendix B). Tritium was not detected at concentrations greater than the LLD.

Gamma Emitters No plant-produced radionuclides were detected.

(Table B-11.2, Appendix B)

E. Precipitation Water Results (Recapture)

Precipitation water samples from 10 locations were analyzed for tritium activity. Tritium was detected in one sample at a concentration of 224 +/-

144 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 2018.

H. Leaks, Spills, and Releases There were no leaks, spills or releases in 2018.

I. Trends No trends have been identified in 2018.

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 2018.

2. Installation of Monitoring Wells No new wells were installed during the 2018.

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, 2018 Site Site Tvpe B-3 Monitoring Well MW-1 Monitoring Well MW-2 Monitoring Well MW-CL-121 Monitoring Well MW-CL-131 Monitoring Well MW-CL-13S Monitoring Well MW-CL-148 Monitoring Well MW-CL-151 Monitoring Well MW-CL-15S Monitoring Well l\i1W-CL-16S Monitoring Well MW-CL-17S Monitoring Well MW-CL-181 Monitoring Well MW-CL-18S Monitoring Well MW-CL-19S Monitoring Well M\I\/-CL-20S Monitoring 'Nell MW-CL-21S Monitoring Well M\I\/-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 l..

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Figure A-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 G'i:~.OUNDWATER SAMPLES COLLECTED IN THE VICINITY OF CLINTON POWER STATION, 2018 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)

B-3 01/24/18 < 192 B-3 05/10/18 < 181 B-3 09/12/18 < 197 < 4.5 < 0.5 < 1.5 < 1.4 2.1 +/- 1.1 < 1.9 B-3 10/31/18 < 192 MW-CL-1 01/24/18 < 193 MW-CL-1 05/10/18 < 184 MW-CL-1 09/12/18 < 196 < 6.5 < 1.0 < 1.3 < 0.5 1.9 +/- 0.9 < 1.3 MW-CL-1 10/31/18 < 194 MW-CL-2 01/24/18 < 193 MW-CL-2 05/10/18 < 180 MW-CL-2 09/12/18 < 195 < 7.4 < 0.8 < 1.6 < 0.5 2.5 +/- 1.1 < 1.3 MW-CL-2 10/31/18 < 196 MW-CL-121 01/25/18 < 177 MW-CL-121 05/10/18 < 181 MW-CL-121 09/13/18 < 194 < 4.2 < 0.7 < 1.3 < 0.5 3.2 +/- 1.0 < 1.3 MW-CL-121 10/31/18 < 194 MW-CL-131 01/24/18 < 192 MW-CL-131 05/10/18 < 178 MW-CL-131 09/12/18 < 195 < 7.1 < 0.9 < 1.4 < 0.5 < 1.5 < 1.3 MW-CL-131 10/31/18 < 199 MW-CL-13S 01/24/18 < 193 MW-CL-13S 05/10/18 245 +/- 122 MW-CL-13S 09/12/18 < 200 < 4.9 < 0.9 < 0.9 < 0.5 < 1.5 < 1.3 MW-CL-13S 10/31/18 < 197 MW-CL-14S 01/25/18 392 +/- 131 MW-CL-14S 05/11/18 840 +/- 151 MW-CL-14S 09/13/18 517 +/- 145 < 4.6 < 0.5 < 2.4 < 0.5 9.8 +/- 1.7 < 1.3 MW-CL-14S 11/01/18 422 +/- 141 MW-CL-151 01/24/18 < 195 MW-CL-151 05/10/18 < 180 MW-CL-151 09/12/18 < 197 < 4.3 < 0.6 < 0.9 < 1.3 < 1.4 < 1.9 MW-CL-151 10/31/18 < 197 MW-CL-15S 01/24/18 < 196 MW-CL-15S 05/10/18 < 182 MW-CL-15S 09/12/18 < 195 < 5.4 < 0.7 < 0.5 < 0.8 < 0.9 < 2.2 MW-CL-15S 10/31/18 < 198 MW-CL-16S 01/25/18 < 193 MW-CL-16S 05/11/18 < 180 MW-CL-16S 09/13/18 < 188 < 4.5 < 0.5 < 0.8 < 0.7 4.6 +/- 1.0 < 2.2 MW-CL-16S 11/01/18 < 197 MW-CL-17S 01/25/18 < 192 MW-CL-17S 05/11/18 < 181 MW-CL-17S 09/13/18 < 198 < 3.8 < 0.6 < 2.2 < 0.5 4.5 +/- 1.5 < 1.5 MW-CL-17S 11/01/18 < 197 MW-CL-181 01/25/18 < 191 MW-CL-181 05/11/18 < 179 MW-CL-181 09/13/18 < 197 < 3.4 < 0.5 < 1.5 < 0.5 3.3 +/- 1.1 < 1.5 MW-CL-181 11/01/18 < 193 B-1

TABLE 8-1.1 C'

CONCENTRATIONS OF TRITIUM, STRONTIUM, GROSS ALPHA AND GROSS BETA IN GROUNDWATER SAMPLES COLLECTED IN THE VICINITY OF CLINTON POWER STATION, 2018 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-8 (Sus)

MW-CL-18S 01/25/18 < 194 MW-CL-18S 05/11/18 < 181 MW-CL-18S 09/13/18 < 197 < 8.2 < 0.7 < 2.7 < 0.5 4.0 +/- 1.4 < 1.5 MW-CL-18S 11/01/18 < 174 MW-CL-19S 01/25/18 < 176 MW-CL-19S 05/10/18 < 182 MW-CL-19S 09/13/18 < 193 < 6.7 < 0.8 < 4.4 < 0.5 5.6 +/- 1.6 < 1.5 MW-CL-19S 10/31/18 < 198 MW-CL-20S 01/24/18 < 191 MW-CL-20S 05/10/18 < 183 MW-CL-208 09/12/18 < 190 < 6.8 < 0.7 < 2.1 < 0.5 2.1 +/- 1.2 < 1.5 MW-CL-208 10/31/18 < 200 MW-CL-21S 01/25/18 < 194 MW-CL-218 05/10/18 < 177 MW-CL-218 09/14/18 < 195 < 4.4 < 0.8 < 1.4 < 0.5 < 1.4 < 1.5 MW-CL-218 10/31/18 < 197 MW-CL-228 01/25/18 < 188 MW-CL-228 05/11/18 < 174 MW-CL-228 09/13/18 < 196 < 7.6 < 0.6 < 2.3 < 0.5 17.6 +/- 1.8 < 1.5 MW-CL-228 11/01/18 < 198 Bolded values indicate LLD was not met due to high solids content in the sample (see program exceptions)

B-2

Table B-1.2 CONCENTRATIONS OF GAMMA EMITTERS IN GROUNDWATER SAMPLES COLLECTED IN THE VICINITY OF CLINTON POWER STATION, 2018 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 09/12/18 < 21 < 21 <2 <2 <5 <2 <5 <3 <5 <2 <2 < 16 <5 MW-1 09/12/18 < 23 < 22 <2 <2 <5 <2 <5 <3 <4 <3 <2 < 16 <6 MW-2 09/12/18 < 16 < 17 <2 <2 <4 <2 <3 <2 <3 <2 <2 < 12 <4 MW-CL-121 09/13/18 < 19 < 18 <2 <2 <5 <2 <4 <2 <4 <2 <2 < 14 <5 MW-CL-131 09/12/18 < 8 < 24 < 1 < 1 <2 < 1 <2 < 1 <2 < 1 < 1 <7 <2 MW-CL-13S 09/12/18 < 15 < 30 <2 <2 <4 <2 <3 <2 <3 <2 <2 < 12 <4 MW-CL-14S 05/11/18 < 27 < 51 <3 <3 <7 <3 <5 <3 <6 <3 <3 < 15 <5 MW-CL-14S 09/13/18 < 15 < 25 < 1 <2 <3 <2 <3 <2 <3 <2 <2 < 13 <4 MW-CL-151 09/12/18 < 16 < 16 <2 <2 <4 <2 <3 <2 <3 <2 <2 < 12 <5 MW-CL-15S 09/12/18 < 18 < 36 <2 <2 <4 <2 <4 <2 <4 <2 <2 < 14 <5 MW-CL-16S 09/13/18 < 15 < 26 < 1 <2 <4 <2 <3 <2 <3 <2 <2 < 13 <4 MW-CL-17S 09/13/18 < 14 < 32 < 1 < 1 <3 < 1 <3 <2 <3 <2 < 1 < 12 <4 MW-CL-181 09/13/18 < 16 < 17 <2 <2 <4 <2 <3 <2 <3 <2 <2 < 14 <5 OJ I

~ MW-CL-18S 09/13/18 < 8 < 22 < 1 < 1 <2 < 1 <2 < 1 <2 < 1 < 1 <7 <2 MW-CL-19S 09/13/18 < 11 < 11 < 1 < 1 <3 < 1 <2 < 1 <2 < 1 < 1 < 10 <3 MW-CL-20S 09/12/18 < 16 < 28 <2 <2 <4 <2 <3 <2 <3 <2 <2 < 12 <5 MW-CL-21S 05/10/18 < 34 < 100 <4 <5 <8 <5 < 11 <4 <7 <4 <5 < 21 <8 MW-CL-21S 09/14/18 < 41 < 36 <4 <4 < 10 <5 <9 <3 <7 <4 <4 < 28 < 13 MW-CL-22S 09/13/18 < 14 < 13 < 1 <2 <4 < 1 <3 <2 <3 <2 <1 < 13 C <4

TABLE B-1.3 CONCENTRATIONS OF HARD TO DETECTS IN GROUNDWATER SAMPLES COLLECTED IN THE VICINITY OF CLINTON POWER STATION, 2018 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-14S 09/13/18 < 0.12 < 0.06 < 0.12 < 0.05 < 0.02 0.. 64 +/- 0.25 < 0.09 0.63 +/- 0.25 < 180 < 4.8 MW-CL-21S 09/14/18 < 0.20 < 0.12 < 0.19 < 0.02 < 0.07 < 0.20 < 0.07 < 0.05 < 200 < 4.2

TABLE B-11.1 CONCENTRATIONS OF TRITIUM IN SURFACE WATER SAMPLES COLLECTEDUIN THE VICINITY OF CLINTON POWER STATION, 2018 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION SITE DATE H-3 SW-CL-1 01/25/18 < 180 SW-CL-1 05/10/18 < 182 SW-CL-1 09/14/18 < 196 SW-CL-1 10/31/18 < 200 SW-CL-2 01/24/18 < 190 SW-CL-2 05/10/18 < 182 SW-CL-2 09/14/18 < 196 SW-CL-2 10/31/18 < 199 SW-CL-4 01/24/18 < 195 SW-CL-4 05/10/18 < 179 SW-CL-4 09/14/18 < 197 SW-CL-4 10/31/18 < 197 SW-CL-5 01/24/18 < 192 SW-CL-5 05/10/18 < 178 SW-CL-5 09/14/18 < 195 SW-CL-5 10/31/18 < 196 SW-CL-6 01/24/18 < 192 SW-CL-6 05/10/18 < 179 SW-CL-6 09/14/18 < 195 SW-CL-6 10/31/18 < 196 SW-CL-7 01/24/18 < 192 SW-CL-7 05/10/18 < 179 SW-CL-7 09/14/18 < 194 SW-CL-7 10/31/18 < 190 B-5

Table B-11.2 CONCENTRATIONS OF GAMMA EMITTERS IN SURFACE WATER SAMPLES COLLECTED IN THE VICINITY OF CLINTON POWER STATION, 2018 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 SW-CL-1 09/14/18 < 19 < 44 < 2 < 2 < 5 < 2 < 4 < 2 < 4 < 2 < 2 < 16 < 6 SW-CL-2 09/14/18 < 19 < 32 < 2 < 2 < 5 < 2 < 4 < 2 < 4 < 2 < 2 < 17 < 6 SW-CL-4 09/14/18 < 18 < 19 < 2 < 2 < 5 < 2 < 4 < 2 < 4 < 2 < 2 < 18 < 6 SW-CL-5 09/14/18 < 19 < 34 < 2 < 2 < 5 < 2 < 4 < 2 < 3 < 2 < 2 < 17 < 5 SW-CL-6 09/14/18 < 19 52 +/- 27 < 2 < 2 < 4 < 2 < 4 < 2 < 4 < 2 < 2 < 16 < 6 SW-CL-7 09/14/18 < 26 < 21 < 3 < 3 < 7 < 3 < 5 < 3 < 5 < 3 < 3 < 22 < 7 OJ I

a,

TABLE B-111.1 CONCENTRATIONS OF TRITIUM IN PRECIPITATION WATER SAMPLES COLLECTED IN THE VICINITY OF CLINTON POWER STATION~ 2018 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION SITE DATE H-3 RG-2 12/28/18 < 194 RG-3 12/28/18 < 192 RG-15 12/28/18 < 195 RG-ENE 12/28/18 < 199 RG-N 12/28/18 < 197 RG-NNE 12/28/18 < 196 RG-NNW 12/28/18 < 197 RG-NW 12/28/18 < 199 RG-S 12/28/18 < 193 RG-WNW 12/28/18 224 +/- 144 B-7

U-604487, Annual Radiological Environmental Operating Report

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