TMI-22-017, 2021 Annual Radiological Environmental Operating Report

2021 Annual Radiological Environmental Operating Report

ML22117A006
Person / Time
Site:	Crane
Issue date:	04/25/2022
From:	Orth T Constellation Generation Group, Teledyne Brown Engineering Environmental Services
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
TMI-22-017
Download: ML22117A006 (149)

Text

Three Mile Island Nuclear Station 441 S P.O. Box 480 Middletown, PA 17057 TMI-22-017 April 25, 2022 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555-0001 Three Mile Island Nuclear Station, Unit 1 Renewed Facility License No. DPR-50 NRC Docket No. 50-289 Three Mile Island Nuclear Station, Unit 2 Possession Only License No. DPR-73 NRC Docket No. 50-320

Subject:

2021 Annual Radiological Environmental Operating Report In accordance with TMI-1 Technical Specification 6.9.2.1 and TMI-2 Technical Specification 6.8.1.1, enclosed is the Annual Radiological Environmental Operating Report covering the time period for January 1 through December 31, 2021, for the Three Mile Island Nuclear Station.

There are no commitments in this letter.

Should you have any questions concerning this letter, please contact Mr. Daniel Jordan, Chemistry/Environmental Specialist, at (717) 948-8470.

Respectfully, Trevor L. Orth Site Decommissioning Director Three Mile Island Nuclear Station, Unit 1

Attachment:

Three Mile Island 2021 Annual Radiological Environmental Operating Report cc: w/ Attachment Regional Administrator - NRC Region I NRC Project Manager, NMSS - Three Mile Island, Unit 1 and Unit 2 W. DeHaas - Commonwealth of Pennsylvania - Bureau of Radiation Protection G. Van Noordennen - TMI-2 Solutions, LLC Orth, Trevor L Digitally signed by Orth, Trevor L Date: 2022.04.25 20:51:17 -04'00'

Docket No:

50-289 50-320 THREE MILE ISLAND NUCLEAR STATION UNITS 1 AND 2 Annual Radiological Environmental Operating Report 1 January through 31 December 2021 Prepared By Teledyne Brown Engineering Environmental Services Three Mile Island Nuclear Station Middletown, PA 17057 April 2022

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i Table Of Contents I. Summary and Conclusions.............................................................................................. 1 II. Introduction..................................................................................................................... 3 A. Objectives of the REMP...................................................................................... 3 B. Implementation of the Objectives........................................................................ 3 III. Program Description...................................................................................................... 4 A. Sample Collection................................................................................................ 4 B. Sample Analysis.................................................................................................. 6 C. Data Interpretation............................................................................................... 6 D. Program Exceptions............................................................................................ 7 E. Program Changes............................................................................................... 9 IV. Results and Discussion............................................................................................... 10 A. Aquatic Environment......................................................................................... 10

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

2. Drinking Water........................................................................................ 10

3. Effluent Water......................................................................................... 11

4. Storm Water............................................................................................ 12

5. Ground Water......................................................................................... 12

6. Fish......................................................................................................... 12

7. Sediment................................................................................................. 12 B. Atmospheric Environment................................................................................. 13

1. Airborne Particulates.............................................................................. 13

a. Air Particulates............................................................................. 13

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

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

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

b. Food Products............................................................................. 14 C. Ambient Gamma Radiation............................................................................... 15 D. Land Use Survey............................................................................................... 15 E. Radiological Impact of TMINS Operations........................................................ 15 F. Errata Data........................................................................................................ 22 G. Summary of Results - Inter-laboratory Comparison Program.......................... 22 V. References................................................................................................................... 26

ii Appendices Appendix A Radiological Environmental Monitoring Report Summary Tables Table A-1 Radiological Environmental Monitoring Program Annual Summary for the Three Mile Island Nuclear Station, 2021 Appendix B Location Designation, Distance & Direction And Sample Collection &

Analytical Methods Tables Table B-1 Location Designation and Identification System for the Three Mile Island Nuclear Station Table B-2 Radiological Environmental Monitoring Program - Sampling Locations, Distance and Direction, Three Mile Island Nuclear Station, 2021 Table B-3 Radiological Environmental Monitoring Program - Summary of Sample Collection and Analytical Methods, Three Mile Island Nuclear Station, 2021 Figures Figure B-1 Environmental Sampling Locations Within One Mile of the Three Mile Island Nuclear Station, 2021 Figure B-2 Environmental Sampling Locations Between One and Five Miles from the Three Mile Island Nuclear Station, 2021 Figure B-3 Environmental Sampling Locations Greater Than Five Miles from the Three Mile Island Nuclear Station, 2021 Appendix C Data Tables and Figures - Primary Laboratory Tables Table C-I.1 Concentrations of Tritium in Surface Water Samples Collected in the Vicinity of Three Mile Island Nuclear Station, 2021 Table C-I.2 Concentrations of I-131 in Surface Water Samples Collected in the Vicinity of Three Mile Island Nuclear Station, 2021 Table C-I.3 Concentrations of Gamma-Emitters in Surface Water Samples Collected in the Vicinity of Three Mile Island Nuclear Station, 2021

iii Table C-II.1 Concentrations of Gross Beta in Drinking Water Samples Collected in the Vicinity of Three Mile Island Nuclear Station, 2021 Table C-II.2 Concentrations of I-131 in Drinking Water Samples Collected in the Vicinity of Three Mile Island Nuclear Station, 2021 Table C-II.3 Concentrations of Tritium in Drinking Water Samples Collected in the Vicinity of Three Mile Island Nuclear Station, 2021 Table C-II.4 Concentrations of Gamma-Emitters in Drinking Water Samples Collected in the Vicinity of Three Mile Island Nuclear Station, 2021 Table C-III.1 Concentrations of Gross Beta, I-131, Tritium, and Strontium in Effluent Water Samples Collected in the Vicinity of Three Mile Island Nuclear Station, 2021 Table C-III.2 Concentrations of Gamma-Emitters in Effluent Water Samples Collected in the Vicinity of Three Mile Island Nuclear Station, 2021 Table C-IV.1 Concentrations of Strontium in Predator and Bottom Feeder (Fish)

Samples Collected in the Vicinity of Three Mile Island Nuclear Station, 2021 Table C-IV.2 Concentrations of Gamma-Emitters in Predator and Bottom Feeder (Fish) Samples Collected in the Vicinity of Three Mile Island Nuclear Station, 2021 Table C-V.1 Concentrations of Gamma-Emitters in Sediment Samples Collected in the Vicinity of Three Mile Island Nuclear Station, 2021 Table C-VI.1 Concentrations of Gross Beta in Air Particulate Samples Collected in the Vicinity of Three Mile Island Nuclear Station, 2021 Table C-VI.2 Monthly and Yearly Mean Values of Gross Beta Concentrations (E-3 pCi/cu meter) in Air Particulate Samples Collected in the Vicinity of Three Mile Island Nuclear Station, 2021 Table C-VI.3 Concentrations of Gamma-Emitters in Air Particulate Samples Collected in the Vicinity of Three Mile Island Nuclear Station, 2021 Table C-VII.1 Concentrations of I-131 in Air Iodine Samples Collected in the Vicinity of Three Mile Island Nuclear Station, 2021 Table C-VIII.1 Concentrations of I-131 in Milk Samples Collected in the Vicinity of Three Mile Island Nuclear Station, 2021 Table C-VIII.2 Concentrations of Strontium in Milk Samples Collected in the Vicinity of Three Mile Island Nuclear Station, 2021 Table C-VIII.3 Concentrations of Gamma-Emitters in Milk Samples Collected in the Vicinity of Three Mile Island Nuclear Station, 2021 Table C-IX.1 Concentrations of Strontium and Gamma-Emitters in Food Product Samples Collected in the Vicinity of Three Mile Island Nuclear Station, 2021

iv Table C-X.1 Quarterly OSLD Results for Three Mile Island Nuclear Station, 2021 Table C-X.2 Mean Quarterly OSLD Results for the Site Boundary, Indicator and Control Locations for Three Mile Island Nuclear Station, 2021 Table C-X.3 Summary of the Ambient Dosimetry Program for Three Mile Island Nuclear Station, 2021 Figures Figure C-1 Monthly Tritium Concentrations in Surface Water and Effluent Water Three Mile Island Nuclear Station, 2021 Figure C-2 Mean Quarterly Tritium Concentrations in Surface Water Three Mile Island Nuclear Station, 1974 - 2021 Figure C-3 Mean Monthly Gross Beta Concentrations in Drinking Water Three Mile Island Nuclear Station, 2021 Figure C-4 Mean Monthly Tritium Concentrations in Drinking Water and Effluent Water Three Mile Island Nuclear Station, 2021 Figure C-5 Mean Cesium-137 Concentrations in Aquatic Sediments Three Mile Island Nuclear Station, 1984 - 2021 Figure C-6 Mean Quarterly Gross Beta Concentrations in Air Particulates Three Mile Island Nuclear Station, 1972 - 2021 Figure C-7 Mean Weekly Gross Beta Concentrations in Air Particulates Three Mile Island Nuclear Station, 2007 - 2021 Figure C-8 Mean Quarterly Strontium-90 Concentrations in Cow Milk Three Mile Island Nuclear Station, 1979 - 2021 Appendix D Data Tables and Figures - Comparison Laboratory Tables Table D-I.1 Concentrations of Gross Beta in Drinking Water Samples Collected in the Vicinity Of Three Mile Island Nuclear Station, 2021 Table D-I.2 Concentration of Tritium in Drinking Water Samples Collected in the Vicinity of Three Mile Island Nuclear Station, 2021 Table D-I.3 Concentrations of Iodine-131 in Drinking Water Samples Collected in the Vicinity of Three Mile Island Nuclear Station, 2021 Table D-I.4 Concentrations of Gamma-Emitters in Drinking Water Samples Collected in the Vicinity of Three Mile Island Nuclear Station, 2021 Table D-II.1 Concentrations of Strontium and Gamma-Emitters in Fish Samples Collected in the Vicinity of Three Mile Island Nuclear Station, 2021 Table D-III.1 Concentrations of Gamma-Emitters in Sediment Samples Collected in the Vicinity of Three Mile Island Nuclear Station, 2021

v Table D-IV.1 Concentrations of Gamma-Emitters and Strontium in Food Product Samples Collected in the Vicinity of Three Mile Island Nuclear Station, 2021 Table D-V.1 Concentrations of Gross Beta in Air Particulate and I-131 in Air Iodine Samples Collected in the Vicinity of Three Mile Island Nuclear Station, 2021 Table D-V.2 Concentrations of Gamma-Emitters in Air Particulate Samples Collected in the Vicinity of Three Mile Island Nuclear Station, 2021 Table D-VI.1 Concentrations of I-131 by Chemical Separation, Gamma-Emitters, and Strontium in Milk Samples Collected in the Vicinity of Three Mile Island Nuclear Station, 2021 Figures Figure D-1 Monthly Gross Beta Concentrations in Drinking Water Samples Collected From TMINS Location Q9-1Q, 2021 Figure D-2 Weekly Gross Beta Concentrations in Air Particulate Samples Collected from TMINS Location E1-2Q, 2021 Appendix E Inter-Laboratory Comparison Program Tables Table E-1 Analytics Environmental Radioactivity Cross Check Program Teledyne Brown Engineering, 2021 Table E-2 DOEs Mixed Analyte Performance Evaluation Program (MAPEP)

Teledyne Brown Engineering, 2021 Table E-3 ERA Environmental Radioactivity Cross Check Program Teledyne Brown Engineering, 2021 Table E-4 Analytics Environmental Radioactivity Cross Check Program Exelon Industrial Services, 2021 Table E-5 ERA Environmental Radioactivity Cross Check Program Exelon Industrial Services, 2021 Table E-6 DOEs Mixed Analyte Performance Evaluation Program (MAPEP)

GEL Laboratories, Inc., 2021 Table E-7 ERA Environmental Radioactivity Cross Check Program GEL Laboratories, Inc., 2021 Table E-8 Analytics Environmental Radioactivity Cross Check Program GEL Laboratories, Inc., 2021 Appendix F Annual Radiological Groundwater Protection Program Report (ARGPPR)

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I.

Summary and Conclusions This report on the Radiological Environmental Monitoring Program conducted for the Three Mile Island Nuclear Station (TMINS) by Exelon covers the period 1 January 2021 through 31 December 2021. During that time period, 1,649 analyses were performed on 1,304 samples. In assessing all the data gathered for this report and comparing these results with preoperational data and operational REMP data, it was concluded that the operation of TMINS had no adverse radiological impact on the environment.

Surface, drinking and effluent water samples were analyzed for concentrations of tritium and gamma-emitting nuclides. Surface, drinking and effluent water samples were also analyzed for concentrations of iodine-131 (I-131). Drinking and effluent water samples were also analyzed for concentrations of gross beta.

Effluent water samples were analyzed for concentrations of strontium-89 (Sr-89) and strontium-90 (Sr-90). All groundwater, precipitation water, and stormwater results are reported in the ARGPPR, Appendix F. No Sr-89 or Sr-90 activities were detected. Iodine-131 activity was detected in one sample. Gross beta concentrations detected were consistent with those detected in previous years.

Tritium activity in 1 surface water sample and 1 monthly effluent water sample was due to TMINS activities or releases. No other fission or activation products potentially attributed to TMI liquid releases were detected.

Fish (predator and bottom feeder) and sediment samples were analyzed for concentrations of gamma-emitting nuclides. Fish samples were also analyzed for concentrations of Sr-90. No Sr-90 activity was detected. Cesium-137 was detected in one sediment sample. No other fission or activation products were detected in fish or in sediment samples.

Air particulate samples were analyzed for concentrations of gross beta and gamma-emitting nuclides. Gross beta activity is consistent with data from previous years. Cosmogenic beryllium-7 (Be-7) was detected at levels consistent with those detected in previous years. No other activation products were detected.

High-sensitivity I-131 analyses were performed on weekly air samples. All results were less than the minimum detectable activity for I-131.

Cow milk samples were analyzed for concentrations of I-131, gamma-emitting nuclides, Sr-89 and Sr-90. Concentrations of naturally-occurring potassium-40 (K-40) were consistent with those detected in previous years. No I-131, Sr-89 or Sr-90 activities were detected. Occasionally Sr-90 activity may be detected and attributed to fallout from nuclear weapons testing. No other fission or activation products were found.

Food Product samples were analyzed for concentrations of gamma-emitting nuclides including I-131 and Sr-90. Concentrations of naturally-occurring Be-7 and K-40 were consistent with those detected in previous years. No other fission or activation products were detected.

Beginning in 2012, Exelon changed the type of dosimetry used for the Radiological Environmental Monitoring Program (REMP). Optically Stimulated Luminescent Dosimetry (OSLD) were deployed and Thermo-luminescent Dosimetry (TLD) were discontinued. This change resulted in a slight change in process and reporting of quarterly results. The relative comparison to control locations remains valid. OSLD technology is different than that used in a TLD but has the same purpose (to measure direct radiation).

In conclusion, radioactive materials related to TMINS operations were detected in environmental samples, but the measured concentrations were low and consistent with measured effluents. The environmental sample results verified that the doses received by the public from TMINS effluents in 2021 were well below applicable dose limits and only a small fraction of the doses received from natural background radiation. Additionally, the results indicated that there was no permanent buildup of radioactive materials in the environment and no increase in background radiation levels.

Therefore, based on the results of the radiological environmental monitoring program (REMP) and the doses calculated from measured effluents, TMINS operations in 2021 did not have any adverse effects on the health of the public or on the environment.

II.

Introduction The Three Mile Island Nuclear Station (TMINS), consisting of two pressurized water reactors (PWR), is located on the northern end of Three Mile Island in the Susquehanna River approximately 2.5 miles south of Middletown in Londonderry Township, Dauphin County, Pennsylvania. TMI-1 is owned and operated by Exelon and became operational in 1974. TMI-2 is operated and owned by TMI-2 Solutions, LLC. TMI-2 became operational in 1978 and was shut down following the 1979 accident. At the end of 1993 TMI-2 was placed in a condition called Post-Defueling Monitored Storage. TMI-2 is maintained by Exelon under contract with TMI-2 Solutions. LLC.

A Radiological Environmental Monitoring Program (REMP) for TMINS was initiated in 1974. This report covers those analyses performed by Teledyne Brown Engineering (TBE), Landauer and Exelon Industrial Services (EIS)/GEL Laboratories on samples collected during the period 1 January 2021 through 31 December 2021.

A.

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

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

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

3. To verify in-plant controls for the containment of radioactive materials.

4. To determine buildup of long-lived radionuclides in the environment and changes in background radiation levels.

5. To provide reassurance to the public that the program is capable of adequately assessing impacts and identifying noteworthy changes in the radiological status of the environment.

6. To fulfill the requirements of the TMI-1 and TMI-2 Technical Specifications.

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.

III.

Program Description A.

Sample Collection Samples for the TMINS REMP were collected for Exelon by Exelon Industrial Services, LLC (EIS) and Normandeau Associates, Inc. (NAI).

This section describes the general collection methods used by EIS & NAI to obtain environmental samples for the TMINS REMP in 2021. Sample locations and descriptions can be found in Tables B-1 and B-2, and Figures B-1 through B-3, Appendix B. The collection procedures used by EIS & NAI are listed in Table B-3.

Aquatic Environment The aquatic environment was evaluated by performing radiological analyses on samples of surface water, drinking water, effluent water, fish and sediment. Two gallon water samples were collected monthly from continuous samplers located at two surface water locations (J1-2 and Q9-1), three drinking water locations (G15-2, G15-3 and Q9-1), and one effluent water location (K1-1). A composite of weekly grab samples at one surface water location (A3-2) were collected. The control locations were A3-2 and Q9-1. All groundwater and storm water results are reported in the ARGPPR, Appendix F.

All water samples were collected in unused plastic bottles, which were rinsed at least twice with source water prior to collection. Fish samples comprising the flesh of two groups, bottom feeders and predators, were collected semiannually at an upstream control (BKG) and a downstream indicator (IND) location. Location IND could be affected by TMINS effluent releases. Sediment samples composed of recently deposited substrate were collected semiannually at three locations (A1-3, J2-1 and K1-3).

Location A1-3 was the control.

Atmospheric Environment The atmospheric environment was evaluated by performing radiological analyses on samples of air particulates and airborne iodine. Airborne iodine and particulate samples were collected and analyzed weekly at seven locations (A3-1, E1-2, F1-3, G2-1, H3-1, M2-1 and Q15-1). The control location was Q15-1. 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 the laboratory for analysis.

Terrestrial Environment The terrestrial environment was evaluated by performing radiological analyses on samples of milk and food product. Milk samples were collected biweekly at four locations (F4-1, G2-1, J18-1 and P4-1) from

March through November, and monthly from December through February.

A single sample was collected in January from control location K15-3. This control location was replaced with J18-1 in March. All samples were collected in new unused two gallon plastic bottles from the bulk tank at each location, preserved with sodium bisulfite and shipped promptly to the laboratory.

Food products were collected from June through September at three locations (B10-2, E1-2 and H1-2), in lieu of milk sampling and annually from the four food product groups at two locations (B10-2 and E1-2). B10-2 was the control location for both annual and monthly sampling. Three different kinds of vegetation samples and nine different kinds of vegetation leaves were collected, placed in new unused plastic bags, and sent to the laboratory for analysis.

Ambient Gamma Radiation Beginning in 2012, Exelon changed the type of dosimetry used for the Radiological Environmental Monitoring Program (REMP). Optically Stimulated Luminescent Dosimetry (OSLD) were deployed and Thermo-Luminescent Dosimetry (TLD) were discontinued. This change may result in a step change in readings, up or down, depending on site characteristics. The relative comparison to control locations remains valid.

OSLD technology is different than that used in a TLD but has the same purpose (to measure direct radiation). The OSLDs were placed at locations on and around the TMINS site as follows:

A site boundary ring consisting of 22 locations (A1-4, B1-2, C1-2, D1-1, E1-4, F1-2, F1-4, G1-3, G1-5, G1-6, H1-1, H1-3, J1-4, J1-3, K1-4, K1-5, L1-1, M1-1, N1-3, P1-2, Q1-2 and R1-1) near and within the site perimeter representing fence post doses (i.e., at locations where the doses will be potentially greater than maximum annual off-site doses) from TMINS release.

An indicator ring consisting of 60 locations (A3-1, A5-1, A9-3, B1-1, B2-1, B5-1, B10-1, C1-1, C2-1, C5-1, C8-1, D1-2, D2-2, D6-1, E1-2, E2-3, E5-1, E7-1, F1-1, F2-1, F5-1, F10-1, G1-2, G2-4, G5-1, H1-3, H3-1, H5-1, H8-1, J1-1, J1-4, J3-1, J5-1, J7-1, K1-5, K2-1, K3-1, K5-1, K8-1, L1-2, L2-1, L5-1, L8-1, M1-2, M2-1, M5-1, M9-1, N1-1, N2-1, N5-1, N8-1, P1-1, P2-1, P5-1, P8-1, Q1-1, Q2-1, Q5-1, Q9-1, R1-2, R3-1, R5-1 and R9-1) extending to approximately 10 miles from the site, designed to measure possible exposures to close-in population.

The balance of 11 locations (D15-1, F25-1, G10-1, G15-1, H15-1, J15-1, K15-1, L15-1, N15-2, Q15-1 and R15-1) represent control areas.

The specific dosimeter 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 221/2 degree sectors around the site, where estimated annual dose from TMINS, if any, would be most significant

3. On hills free from local obstructions and within sight of the vents (where practical)

4. And near the closest dwelling to the vents in the prevailing downwind direction Each station has two Al2O3:C Optically Stimulated Luminescence Dosimeters enclosed in plastic placed at each location in a frame located approximately 3-6 feet above ground level. Since each OSLD responds to radiation independently, this provides two independent detectors at each station.

B.

Sample Analysis This section describes the general analytical methods used by TBE and EIS to analyze the environmental samples for radioactivity for the TMINS REMP in 2021. The analytical procedures used by the laboratories are listed in Table B-3.

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

1. Concentrations of beta-emitters in drinking and effluent water and air particulates

2. Concentrations of gamma-emitters in surface, drinking, and effluent water, air particulates, milk, fish, sediment and food products

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

4. Concentrations of I-131 in surface, drinking and effluent water, air, milk and food products

5. Concentrations of strontium in effluent water, fish, milk and food products

6. Ambient gamma radiation levels at various site environs C.

Data Interpretation Data were compared to previous years' operational data for consistency and trending. In addition, comparison to pre-operational data is sometimes made. For the purpose of this report, TMINS 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) was defined as the smallest concentration of radioactive material in a sample that would yield a net

count (above background) that would be detected with only a 5%

probability of falsely concluding that a blank observation represents a "real" signal. The LLD was intended as a before the fact estimate of a system (including instrumentation, procedure and sample type) and not as an after the fact criteria for the presence of activity. All analyses were designed to achieve the required TMINS detection capabilities for environmental sample analysis.

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

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

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

For surface, drinking, and effluent water 11 nuclides, Mn-54, Co-58, Fe-59, Co-60, Zn-65, Nb-95, Zr-95, Cs-134, Cs-137, Ba-140 and La-140 MDCs were reported.

For fish eight nuclides, K-40, Mn-54, Co-58, Fe-59, Co-60, Zn-65, Cs-134 and Cs-137 MDCs were reported.

For sediment six nuclides, K-40, Mn-54, Co-58, Co-60, Cs-134 and Cs-137 MDCs were reported.

For air particulate eight nuclides, Be-7, Mn-54, Co-58, Co-60, Nb-95, Zn-95, Cs-134 and Cs-137 MDCs were reported.

For milk five nuclides, K-40, Cs-134, Cs-137, Ba-140 and La-140 MDCs were reported.

For food products five nuclides, Be-7, K-40, I-131, Cs-134 and Cs-137 MDCs were reported.

Means and standard deviations of the results were calculated. The standard deviations represent the variability of measured results for different samples rather than single analysis uncertainty.

D.

Program Exceptions For 2021, the TMINS REMP had a sample recovery rate of >99%. Issue Reports (IR) were initiated to document significant exceptions and missing samples. All exceptions are listed below:

Water

1. Q9-1 (Surface Water and Drinking Water)

For the sampling periods 01/02/21 - 04/03/21, 04/03/21 - 07/03/21, 07/03/21 - 10/02/21 and 10/02/21 - 01/01/22, composite samplers were not set back up for collection due to no access to plant for visitors because of COVID. Weekly grab samples were collected by a plant worker at both locations and used to make a monthly composite.

(IRs 4428294, 4443711, 4464906 and 4473524)

2. A3-2 (Surface Water Control Location)

TMIs offsite analyses vendor for environmental samples contacted the TMI task manager to identify that the surface water at Station TM-SW-A3-2 had low-level iodine-131 (I-131) concentration of 2.60 pCi/L for the sampling period 12/29/20 to 01/28/21. Monthly samples from location A3-2 are analyzed for I-131 activity (ODCM Table 8.1).

TMI-SW-A3-2 is a control or background station located upstream of TMI on the Swatara Creek. This is a control or background station sampled because known medical discharges of radiopharmaceuticals occur into the surface water upstream of TMI from Hershey Medical Hospital. During the same sampling period, no detectable I-131 was present at TM-SW-Q9-1, another control background station located upstream of TMI. Also, TMI's effluent composite sample and REMP indicator stations located south of TMI all had no detectable I-131 concentration.

The I-131 detected is not plant related and is a result of medical discharges of radiopharmaceuticals into the surface water upstream of TMI from Hershey Medical Hospital. No further immediate action is required for this reported result. (IR 4404597)

Milk

1. (K15-3)

On 02/10/21, the K15-3 farm site owner Wayne Meyers notified the sampler that his farm was no longer producing milk. The impact is that milk can no longer be collected as required by CY-ES-244-F-03 and the TMI ODCM, CY-AA-170-3100, Rev. 07 OFFSITE DOSE CALCULATION MANUAL. The new dairy farm replacing K15-3 is listed below and is in sector J and has designation J18-1:

Stump Acres Dairy Owner - Terry Stump 1737 Arnold Road York, PA.17408 (717) 495-3216 Coordinates: N 39 54 6.62 W 076 46 36.597

This sample was added to the sampling schedule and was first sampled on 3/10/21. (IR 4401567)

2. Missing Milk Samples All required REMP Milk samples were obtained by EIS on 03/24/21. A portion of each sample is sent to Teledyne for analysis. When Teledyne received the sample cooler on 03/29/21, the cooler was not taped shut.

Samples from farms G2-1 and F4-1 were missing from the cooler and therefore were not analyzed. Sample location J18-1 was missing half of the sample, but the lab had enough sample to run the required analysis.

There was a complete sample volume for location P4-1. This is the normal method for shipping using FedEx with no issues previously.

(IR 4421341)

Dosimetry (E1-2)

For the sampling period 07/03/21 - 09/24/21, the field tech upon arrival found that the 3rd dosimeter was missing. The two main dosimeters of legal record were still inside the bracket, but the 3rd (QA) dosimeter

(#EX00080233Y) was missing. The field tech did a complete sweep of the area, but nothing was found. The previous AR for lost sample at this site is 04394059. (IR 4466619)

J1-2 Sampler When the EIS technician went to obtain the 04/10/21 - 04/17/21 weekly composite water sample at J1-2 sampler building, he found no power to the building and sampler due to downed wires from a fallen tree. Several wires are disconnected from the breaker box. A partial sample was collected.

Sample building is located on the south/west side of the island.

(IR 4444278)

Each program exception was reviewed to understand the causes of the program exception. Sampling and maintenance errors were reviewed with the personnel involved to prevent recurrence. Occasional equipment breakdowns and power outages were unavoidable. The overall sample recovery rate indicates that the appropriate procedures and equipment are in place to assure reliable program implementation.

E.

Program Changes A milk location was replaced (see Program Exceptions above). Three new OSLD sample locations were added during the 4th Quarter, 2021. There were no other changes to the program in 2021.

IV.

Results and Discussion A.

Aquatic Environment

1. Surface Water Samples were taken weekly from a continuous sampler at one location (J1-2) and weekly grab samples from two locations (Q9-1 and A3-2).

Weekly samples were composited on a monthly schedule. Of these locations only J1-2 located downstream could be affected by TMINS effluent releases. The following analyses were performed:

Tritium Monthly samples from J1-2 and Q9-1 were analyzed for tritium activity (Table C-I.1, Appendix C). Positive tritium activity was detected in 1 of 12 samples at location J1-2, which is located immediately downstream of the TMINS effluent outfall. The concentration was 498 pCi/L, well below any regulatory limits. The indicator surface water sample is taken just downstream of the liquid discharge outfall where mixing of liquid effluents with the river water is incomplete. More complete mixing is not achieved until liquid effluents pass over the York Haven Dam. This water is normally not consumed by humans.

(Figures C-1 and C-2, Appendix C)

Iodine Monthly samples were taken from location A3-2 and analyzed for I-131. This is a control or background station sampled because known medical discharges of radiopharmaceuticals occur into the surface water upstream of TMI from a nearby hospital. Positive activity was detected in 1 of 12 samples with a concentration of 2.6 pCi/L and was described previously in the Program Exceptions section above.

(Table C-I.2, Appendix C).

Gamma Spectrometry Locations J1-2 and Q9-1 were analyzed for gamma-emitting nuclides (Table C-I.3, Appendix C). All nuclides were less than the MDC.

2. Drinking Water Monthly samples were collected from continuous water samplers at three locations (G15-2, G15-3 and Q9-1). Two locations (G15-2 and G15-3) could be affected by TMINS effluent releases. The following analyses were performed:

Gross Beta Monthly samples from all locations were analyzed for concentrations of gross beta (Tables C-II.1, Appendix C). Gross beta activity was detected in 12 of 36 samples. The concentrations ranged from 2.3 to

3.1 pCi/L. Concentrations detected were consistent with those detected in previous years. (Figure C-3, Appendix C)

Iodine Monthly samples from all locations were analyzed for concentrations of I-131. I-131 activity was not detected in any sample.

(Table C-II.2, Appendix C)

Tritium Monthly samples from all locations were analyzed for tritium activity (Table C-II.3, Appendix C). Tritium was not detected in any sample.

(Figures C-4, Appendix C)

Gamma Spectrometry Samples from all locations were analyzed for gamma-emitting nuclides. All nuclides were less than the MDC.

(Table C-II.4, Appendix C)

3. Effluent Water Monthly samples were collected from a continuous water sampler at one location (K1-1). The following analyses were performed:

Gross Beta Monthly samples from location K1-1 were analyzed for concentrations of gross beta. Gross beta was detected in 5 of 12 samples. The concentrations ranged from 2.1 to 2.7 pCi/L. Concentrations detected were consistent with those detected in previous years.

(Tables C-III.1, Appendix C)

Iodine-131 Monthly samples from location K1-1 were analyzed for concentrations of I-131. I-131 was not detected in any of the samples.

(Tables C-III.1, Appendix C)

Tritium Monthly samples from location K1-1 were analyzed for tritium activity.

Tritium activity was detected in 1 of 12 samples at a concentration of 4,210 pCi/L. (Table C-III.1 & Figure C-4, Appendix C)

Strontium Semiannual composite samples from location K1-1 were analyzed for Sr-89 and Sr-90. No strontium activity was detected. The highest MDC was calculated at <4.6 pCi/L for Sr-89 and at <0.7 pCi/L for Sr-90. (Table C-III.1, Appendix C)

Gamma Spectrometry Samples from location K1-1 were analyzed for gamma-emitting nuclides. All nuclides were less than the MDC.

(Table C-III.2, Appendix C)

4. Storm Water Storm water results are included in the Annual Radiological Groundwater Protection Program (ARGPPR), Appendix F.

5. Ground Water Groundwater results are included in the Annual Radiological Groundwater Protection Program (ARGPPR), Appendix F.

6. Fish Fish samples comprised of bottom feeders and predators were collected at two locations (IND and BKG) semiannually. Location IND could be affected by TMINS effluent releases. The following analyses were performed:

Strontium The edible portions of fish samples from both locations were analyzed for Sr-90. No strontium activity was detected. The highest MDC was calculated at <4.6 pCi/kg wet for Sr-90. (Table C-IV.1, Appendix C)

Gamma Spectrometry The edible portions of fish samples from both locations were analyzed for gamma-emitting nuclides. Naturally-occurring K-40 was found in all fish samples. Concentrations ranged from 2,505 to 3,694 pCi/kg wet and was consistent with levels detected in previous years. No fission or activation products were detected. (Table C-IV.2, Appendix C)

7. Sediment Aquatic sediment samples were collected at three locations (A1-3, J2-1 and K1-3) semiannually. Of these locations two (J2-1 and K1-3) could be affected by TMINS effluent releases. The following analysis was performed:

Gamma Spectrometry Sediment samples from all locations were analyzed for gamma-emitting nuclides. Potassium-40 was found in all sediment samples and ranged from 7,750 to 17,470 pCi/kg dry. Cesium-137 was found in one sample at a concentration of 94 pCi/kg dry. This nuclide is found occasionally in sediment at very low levels (just above LLD) and is not distinguishable from background levels. No other fission or activation products were detected. (Figure C-5 & Table C-V.1, Appendix C)

B.

Atmospheric Environment

1. Airborne Particulates

a. Air Particulates Continuous air particulate samples were collected from seven locations on a weekly basis. Six locations (A3-1, E1-2, F1-3, G2-1, H3-1 and M2-1) were indicator stations located in the highest D/Q sectors and the nearest communities to TMI. One sample (Q15-1) represents the control location at a remote distance from TMINS. The following analyses were performed:

Gross Beta Weekly samples were analyzed for concentrations of beta emitters. Detectable gross beta activity was observed at all locations. (Table C-VI.1 and C-VI.2, Appendix C)

Comparison of results aid in determining the effects, if any, resulting from the operation of TMINS. The results from the closest to the site boundary locations (Group I) ranged from 6 to 31E-3 pCi/m3 with a mean of 16E-3 pCi/m3. The results from the intermediate offsite locations (Group II) ranged from 6 to 34E-3 pCi/m3 with a mean of 16E-3 pCi/m3. The results from the Control location (Group III) ranged from 8 to 35E-3 pCi/m3 with a mean of 17E-3 pCi/m3. Comparison of the 2021 air particulate data with previous years data indicate no effects from the operation of TMINS (Figure C-6, Appendix C). In addition, a comparison of the weekly mean values for 2021 indicate no notable differences between indicator and control stations. (Figure C-7, Appendix C)

Gamma Spectrometry Weekly samples were composited quarterly and analyzed for gamma-emitting nuclides. Naturally-occurring Be-7 due to cosmic ray activity was detected in all 28 samples. These concentrations ranged from 53 to 93E-3 pCi/m3. All other nuclides were less than MDC. (Table C-VI.3, Appendix C)

b.

Airborne Iodine Continuous air samples were collected from seven (A3-1, E1-2, F1-3, G2-1, H3-1, M2-1 and Q15-1) locations and analyzed weekly for I-131. All results were less than the MDC for I-131.

(Table C-VII.1, Appendix C)

2. Terrestrial

a.

Milk Samples were collected from three locations (F4-1, G2-1 and P4-1) biweekly March through November and monthly December

through February. Samples were collected biweekly March through November and once monthly in December from location J18-1. A single monthly sample was collected from location K15-3 in January. The following analyses were performed:

Iodine-131 Milk samples from all locations were analyzed for concentrations of I-131. All results were less than the MDC.

(Table C-VIII.1, Appendix C)

Strontium Milk samples from all locations were composited quarterly and analyzed for Sr-89 and Sr-90. No Sr-89 or Sr-90 activity was detected. (Table C-VIII.2, Appendix C) The results are consistent with those detected in the pre-operational years.

(Figure C-8, Appendix C)

Gamma Spectrometry Milk samples from all locations were analyzed for concentrations of gamma-emitting nuclides. Naturally-occurring K-40 activity was found in all samples. The concentrations ranged from 631 to 1,579 pCi/L. All other nuclides were less than the MDC.

(Table C-VIII.3, Appendix C).

b.

Food Products Food products were collected monthly at three locations (B10-2, E1-2 and H1-2), in lieu of milk sampling, and annually from the four food product groups at two locations (B10-2 and E1-2). B10-2 was the control location for both annual and monthly sampling.

The following analyses were performed:

Strontium Six food product samples were analyzed for concentrations of Sr-90. No Sr-90 activity was detected in any sample.

(Table C-IX.1, Appendix C)

Gamma Spectrometry Each food product sample was analyzed for concentrations of gamma-emitting nuclides. Naturally-occurring Be-7 due to cosmic ray activity was detected in 26 of 42 samples with concentrations ranging from 357 to 2,272 pCi/kg. Naturally-occurring K-40 activity was found in all samples. The concentrations ranged from 1,234 to 5,865 pCi/kg. All other nuclides were less than the MDC.

(Table C-IX.1, Appendix C)

C.

Ambient Gamma Radiation Ambient gamma radiation levels were measured utilizing Optically Stimulated Luminescence Dosimeter (OSLD). Ninety-three OSLD locations were established around the site. Results of OSLD measurements are listed in Tables C-X.1 to C-X.3, Appendix C.

The nearest resident to the Independent Spent Fuel Storage Installation (ISFSI) saw no detectable gamma radiation levels above background due to ISFSI. Therefore, ISFSI operations did not have an impact to members of the public in 2021.

All of the OSLD measurements were below 32 mR/quarter, with a range of 10.5 to 31.3 mR/standard quarter. A comparison of the Site Boundary and Indicator data to the Control Location data, indicate that the ambient gamma radiation levels from the Control Locations D15-1, F25-1, G10-1, G15-1, H15-1, J15-1, K15-1, L15-1, N15-2, Q15-1 and R15-1 averaged higher than indicator stations. Locations D15-1, F25-1, G10-1, G15-1, H15-1, J15-1, K15-1, L15-1, N15-2, Q15-1 and R15-1 have a historical high bias, and this bias is most likely due to radon and other naturally-occurring nuclides, e.g. K-40, emanating from the ground.

D.

Independent Spent Fuel Storage Instillation (ISFSI)

ISFSI operations began in October 2021. Four casks were added to the ISFSI pad in 2021 utilizing the NAC MAGNASTOR System. Site boundary Environmental OSLD's, which measure gamma radiation closest to ISFSI are C1-2, D1-1, E1-4, F1-2, G1-3, K1-3, K1-5, L1-1, M1-1 and N1-

3. OSLD K1-5 was added at the site boundary and OSLD's H1-3 and J1-4 were added as closest to the ISFSI pad. There was no radiation detected above background. Therefore, there was no direct radiation attributed to TMI from ISFSI operations to any resident.

E.

Land Use Survey A Land Use Survey conducted in the 2021 fall growing season around the Three Mile Island Nuclear Station (TMINS) was performed by Exelon Industrial Services (EIS) for Exelon to comply with TMI-2 Tech Spec 6.7.2.b and Section 8.2 of the Plant's Offsite Dose Calculation Manual (ODCM). The purpose of the survey was to document the nearest resident, milk-producing animal and garden of greater than 500 ft2 in each of the sixteen 221/2 degree sectors around the site. The results of these surveys are summarized below:

F.

Radiological Impact of TMINS Operations An assessment of potential radiological impact indicated that radiation doses to the public from 2021 operations at TMINS were well below all applicable regulatory limits and were significantly less than doses received from natural sources of radiation. The 2021 whole body dose potentially received by an assumed maximum exposed individual from TMI-1 and TMI-2 liquid and airborne effluents was conservatively calculated to be 0.016 mrem. This dose is equivalent to 0.01% of the dose that an individual living in the TMI area receives each year from natural background radiation.

1. Determination of Radiation Doses to the Public Dose assessments can be performed by using either effluent data and an environmental transport model or environmental sample data. To the extent possible, doses to the public are based on the direct measurement of dose rates from external sources and the measurement of radionuclide concentrations in environmental media which may contribute to an internal dose of radiation. Optically Stimulated Luminescent Dosimetry (OSLDs) positioned in the environment around TMINS provide measurements to determine external radiation doses to humans. Samples of air, water and food products are used to determine internal doses.

The quantity of radioactive materials released during normal operations are typically too small to be measured once distributed in the offsite Distance in Miles from the TMINS Reactor Buildings Sector Residence Miles Garden Miles Milk Farm Miles A

N 1.0 1.9 2.1 B

NNE 0.8 1.2 C

NE 0.5 1.1 4.2 D

ENE 0.5 0.5 4.5 E

E 0.4 0.5 1.1 F

ESE 1.1 0.5 3.2 G

SE 0.7 0.6 1.4 H

SSE 0.7 0.8 J

S 2.2 2.5 K

SSW 0.6 1.6 4.9 L

SW 0.5 1.7 M

WSW 1.2 1.3 N

W 1.2 1.3 P

WNW 1.1 1.5 3.7 Q

NW 1.1 1.2 R

NNW 1.1 2.4

environment. Therefore, the potential offsite doses are more effectively calculated for TMINS operations using a computerized model that predicts concentrations of radioactive materials in the environment and subsequent radiation doses based on measured effluents.

Doses are calculated using a model that incorporates the guidelines and methodology set forth by the USNRC in Regulatory Guide 1.109 and NUREG 0133. Due to the conservative assumptions that are used in the model, the calculated doses are generally higher than the doses based on actual environmental sample concentrations.

Therefore, the model predicts doses that are higher than actual doses received by people. The type and amount of radioactivity released from TMINS is calculated using measurements from effluent sample analyses.

Airborne releases are diluted and carried away from the site by atmospheric diffusion, which continuously acts to disperse radioactivity.

Variables that affect atmospheric dispersion include wind speed, temperature at different elevations, terrain, and shift in wind direction. A weather station on the north end of TMI is linked to a data logger that records the meteorological data.

Computer models also are used to predict the downstream dilution and travel times for liquid releases into the Susquehanna River. Actual monthly Susquehanna River flows are obtained from the USGS Stream gauging station 01570500 located at Harrisburg, PA.

The human exposure pathways also are included in the model and are depicted in Figure 1. The exposure pathways that are considered for the discharge of TMINS liquid effluents are consumption of drinking water and fish. The exposure pathways considered for the discharge of TMINS airborne effluents are plume exposure, inhalation, cow milk consumption, fruit and vegetable consumption, and meat consumption.

When determining the dose to humans, it is necessary to consider all applicable pathways and all exposed tissues, summing the dose from each to provide the total dose for each organ as well as the whole body from a given radionuclide. Dose calculations involve determining the energy absorbed per unit mass in the various tissues. Thus, for radionuclides taken into the body, the metabolism of the radionuclide in the body must be known along with the physical characteristics of the nuclide such as energies, types of radiations emitted and half-life. The dose assessment model also contains dose conversion factors for the radionuclides for each of four age groups (adults, teenagers, children and infants) and eight organs (total body, thyroid, liver, skin, kidney, lung, bone and GI tract).

2. Result of Dose Calculations The maximum hypothetical doses due to 2021 TMI-1 and TMI-2 liquid and airborne effluents are summarized in Tables 1 and 2. Table 1 compares the calculated maximum hypothetical individual doses to the USNRC 10 CFR 50 App. I guidelines. This table also compares the calculated doses (to an individual of the public) from effluents and direct radiation to USEPA 40 CFR 190 dose limits. Table 2 presents the maximum hypothetical whole body doses to an individual. As shown in Table 1, the doses calculated for 2021 operations at TMINS were well below the Federal dose limits (USEPA 40 CFR 190) and the guidelines of USNRC 10 CFR 50 App. I. This conclusion was supported by radionuclide concentrations detected in actual environmental samples.

Doses from natural background radiation provide a baseline for assessing the potential public health significance of radioactive effluents.

Natural background radiation from cosmic, terrestrial and natural radionuclides in the human body (not including radon), averages about 81 mrem/yr (Ref. 5). Additionally, the average individual living in the United States receives an annual dose of about 2,760 mrem to the lung from natural radon gas. This lung dose is considered to be equivalent to a whole (or total) body dose of 230 mrem (Ref. 5). Therefore, the average person in the United States receives a whole body dose of about 311 mrem/yr from natural background radiation sources.

As shown on Table 2, the maximum hypothetical whole body dose received by an individual from 2021 TMI-1 and TMI-2 liquid and airborne effluents combined was conservatively calculated to be 0.016 mrem. This dose is equivalent to 0.01% percent of the dose that an individual living in the TMI area receives each year from natural background radiation (311 mrem).

The low doses calculated for 2021 TMINS operations were the result of efforts to maintain releases "as low as reasonably achievable" (ALARA).

In conclusion, radioactive materials related to 2021 TMINS operations were detected in environmental samples, but the measured concentrations were low and consistent with measured effluents. The environmental sample results verified that the doses received by the public from TMINS effluents in 2021 were well below applicable dose limits and only a small fraction of the doses received from natural background radiation. Additionally, the results indicated that there was no permanent buildup of radioactive materials in the environment and no increase in background radiation levels.

Therefore, based on the results of the radiological environmental monitoring program (REMP) and the doses calculated from measured effluents, TMINS operations in 2021 did not have any adverse effects on the health of the public or on the environment.

TABLE 1 Calculated Maximum Hypothetical Doses to an Individual from 2021 TMI-1 and TMI-2 Liquid and Airborne Effluents Maximum Hypothetical Doses To An Individual USNRC 10 CFR 50 APP. I Calculated Dose Guidelines (mrem/yr)

(mrem/yr)

TMI-1 TMI-2 From Radionuclides 3 total body, or 5.43E-03 3.80E-04 In Liquid Releases 10 any organ 7.01E-03 6.05E-04 From Radionuclides In 5 total body, or 0* 0*

Airborne Releases (Noble Gases) 15 skin 0* 0*

From Radionuclides In Airborne 15 any organ 1.02E-02 7.73E-05 Releases (Iodines, Tritium and Particulates)

• No noble gases were released from TMI-2.

USEPA Calculated Dose 40 CFR 190 (mrem/yr)

Limits TMI-1 and TMI-2 (mrem/yr)

Combined**

Total from Site 75 thyroid 0.013 25 total body 0.018 or other organs

• *This sums together TMI-1 and TMI-2 maximum doses regardless of age group for different pathways. The combined doses include those due to radioactive effluents and direct radiation from TMINS. The direct radiation dose is calculated from environmental dosimeter data. For this calculation, exposure is assumed to be equal to dose.

The direct radiation dose from 2021 TMINS operations was 0.183 mrem/yr based on calculations from ANSI/HI Standard N13.37.

TABLE 2 Calculated Whole Body Doses to the Maximum Individual from 2021 TMI-1 and TMI-2 Liquid and Airborne Effluents Calculated Maximum Individual Whole Body Dose (mrem/yr)

TMI-1 TMI-2 From Radionuclides In Liquid Releases 5.43E-03 3.80E-04 From Radionuclides in Airborne Releases 0* 0*

(Noble Gases)

From Radionuclides In Airborne 1.02E-02 7.73E-05 Releases (Iodines, Tritium and Particulates)

• No noble gases were released from TMI-1 or TMI-2.

Individual Whole Body Dose Due to TMI-1 and TMI-2 Operations:

0.016 mrem/yr Individual Whole Body Dose Due to Natural Background Radiation (1) 311 mrem/yr (1) NCRP 160 - (2009)

Figure 1

G.

Errata Data There was no errata data for 2021.

H.

Summary of Results - Inter-Laboratory Comparison Program The primary and other secondary laboratories analyzed Performance Evaluation (PE) samples of air particulate, air iodine, milk, soil, vegetation and water matrices (Appendix E). The PE samples, supplied by Analytics Inc., Environmental Resource Associates (ERA) and DOEs MAPEP, were evaluated against the following pre-set acceptance criteria:

1. Analytics Evaluation Criteria Analytics evaluation report provides a ratio of TBEs result and Analytics known value. Since flag values are not assigned by Analytics, TBE-ES evaluates the reported ratios based on internal QC requirements, which are based on DOE MAPEP criteria.

2. ERA Evaluation Criteria ERAs evaluation report provides an acceptance range for control and warning limits with associated flag values. ERAs acceptance limits are established per the USEPA, NELAC, state specific PT program requirements or ERAs SOP for the Generation of Performance Acceptance Limits, as applicable. The acceptance limits are either determined by a regression equation specific to each analyte or a fixed percentage limit promulgated under the appropriate regulatory document.

3. DOE Evaluation Criteria MAPEPs evaluation report provides an acceptance range with associated flag values. The MAPEP defines three levels of performance:

Acceptable (flag = A)

Acceptable with Warning (flag = W)

Not Acceptable (flag = N)

Performance is considered acceptable when a mean result for the specified analyte is +/- 20% of the reference value. Performance is acceptable with warning when a mean result falls in the range from

+/-20% to +/-30% of the reference value (i.e., 20% < bias < 30%). If the bias is greater than 30%, the results are deemed not acceptable.

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, 146 out of 154 analyses performed met the specified acceptance criteria. Seven analyses did not meet the specified acceptance criteria and were addressed through the TBE Corrective Action

Program. NOTE: One analysis (soil for Tc-99) that did not meet acceptance criteria was performed for TBE information and is not on the list of required ICP analyses. A summary is found below:

1.

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

2.

The MAPEP February 2021 AP Gross Alpha result was evaluated as Not Acceptable. The reported value was 0.371 Bq/sample and the known result was 1.77 Bq/sample (acceptance range 0.53 - 3.01). A similar failure had occurred several years prior due to the filter being placed with the wrong side up on the detector. At that time, a small dot was placed on the top of the filter prior to removal from the package to indicate the correct side for counting. The current sample was still in the detector when the result was received (dot side facing the detector). The sample was recounted with a similar result and was flipped and recounted. The flipped result was 0.661 Bq/sample, within the acceptable range. Because TBE cannot rely on receiving correct packaging from the provider, MAPEP AP cross-checks will be counted on both sides going forward. NOTE: The August sample had the same packaging issue (upside down). (NCR 21-02)

3.

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

4.

The ERA October 2021 water Gross Beta result was evaluated as Not Acceptable. The reported value was 63.0 pCi/L and the known was 55.7 (acceptance range 38.1 - 62.6) or 113% of the known. The 2-sigma error was 6.8, placing the reported result well within the acceptable range. All QA was reviewed with no anomalies. A follow-up Quick Response cross-check was analyzed with a 120% ratio (see item 7). (NCR 21-10)

5.

The ERA October 2021 water Tritium result was evaluated as Not Acceptable. The reported value was 13,800 pCi/L and the known was 17,200 (acceptance range 15,000 - 18,900). The 2-sigma error was 1,430, placing the result within the acceptable range. TBEs internal QC acceptance is 70% - 130%, while ERAs for this sample was 87%

- 110%. All QA was reviewed with no anomalies. A Quick Response follow-up cross-check was analyzed with a result of 17,500 pCi/L (known 17,800 pCi/L). (NCR 21-11)

6.

The MAPEP August 2021 soil Ni-63 result was evaluated as Not Acceptable. The reported value was 546 Bq/kg and the known result was 1,280 Bq/kg (acceptance range 896 - 1,664). All QC was reviewed and no anomalies found. The procedure revision to remove added MAPAP interferences was ineffective for this sample. No client soil matrix samples were analyzed for Ni-63 in 2020 or 2021. The root cause investigation is still ongoing at this time. (NCR 21-13)

7.

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

For the secondary QC samples, EIS laboratory, analyzed gross beta, gramma, and I-131 for TMINS. For the EIS Laboratory, 135 out of 135 analyses performed met the specified NRC Resolution Test Criteria (NRC Inspection Manual, Inspection Procedure 84750, March 15, 1994). The EIS Laboratorys results are reported with 2-sigma uncertainty. When evaluating with the NRC Resolution Test, a 1-sigma uncertainty is used to determine Pass or Fail. Any failures are addressed through the Corrective Action Program.

For the secondary QC samples, GEL laboratory analyzed only H-3 and Sr-89/90 nuclides for TMINS REMP & RGPP. For these analyses, 32 out of 35 cross-check samples met the specified acceptance criteria. Failures were addressed through GELs Corrective Action Program. A summary of these failures are described below:

1.

The ERA 1st quarter 2021 water reported result of 74.6 pCi/L for Sr-89 was evaluated as Not Acceptable. The known result was 61.3 pCi/L with an acceptance range of 49.4 - 69.2 pCi/L. The LCS trend was reviewed to identify the high bias. The calibration used for the analysis was compared to the new calibration performed recently and the original reported data was processed with both calibrations for

comparison. Data was comparable. Instrument logs were reviewed with no indication of possible bias from run log. The Strontium drinking water method includes two gravimetric yields. Both were reviewed and it was noted that the Yttrium yields appeared to be slightly higher than expected for this method. It is possible that the Yttrium yields were biased high due to analyst error during the drying process. The original reported data was processed with typically recovered Yttrium method yields and the Sr-89 value (65.8 pCi/L) was with the acceptance range at 108%.

2.

The MAPEP 2nd quarter 2021 vegetation Sr-90 result was evaluated as Not Acceptable. The reported value was 0.444 Bq/sample and the known result was 0.673 Bq/sample (acceptance range of 0.471 -

0.875 Bq/sample). The data was reviewed with no errors found. It was noted that several other reported isotopes ha a low bias but were within the acceptance ranges for their parameters. It is suspected that the sample preparation had an unidentified error during the digestion process.

3.

The ERA 3rd quarter 2021 water Sr-90 result was evaluated as Not Acceptable. The reported value was 46.2 pCi/L and the known result was 40.1 pCi/L (acceptance range of 29.5 - 46.1 pCi/L). The root cause investigation included a sample preparation and data review of the process. No gross errors or possible contributors were found for the high bias. The reported value is 115% of the reference value, which is within the laboratorys standard acceptance criteria of +/-

25% for Laboratory Control samples. In addition, the sample was prepared/reported by analytical method 905.0. The result was within acceptance limits with an RPD of 11.7 when compared to the unacceptable value.

The Inter-Laboratory Comparison Program provides evidence of in control counting systems and methods, and that the laboratories are producing accurate and reliable data. Interlaboratory Comparison results may be found in Appendix E.

V.

References

1. Three Mile Island Nuclear Station, Unit 1, Technical Specifications, DPR 50.

2. Three Mile Island Nuclear Station, Unit 2, PDMS Technical Specifications, DPR 73.

3. Radiation Management Corporation. Three Mile Island Nuclear Station, Preoperational Radiological Environmental Monitoring Program, January 1, 1974 - June 5, 1974. RMC-TR-75-17, January 1975.

4. Exelon. Three Mile Island Nuclear Station Offsite Dose Calculation Manual (ODCM).

5. National Council of Radiation Protection and Measurements Report No. 160.

Ionizing Radiation Exposure of the Population of the United States. 2009

APPENDIX A RADIOLOGICAL ENVIRONMENTAL MONITORING REPORT

SUMMARY

Intentionally left blank

NAME OF FACILITY: THREE MILE ISLAND NUCLEAR STATION DOCKET NUMBER:

50-289 & 50-320 LOCATION OF FACILITY: MIDDLETOWN COUNTY, PA REPORTING PERIOD:

2021 INDICATOR CONTROL MEDIUM OR REQUIRED LOCATIONS LOCATION NUMBER OF PATHWAY SAMPLED TYPES OF NUMBER OF LOWER LIMIT MEAN (M)

MEAN (M)

MEAN (M)

STATION #

NONROUTINE (UNIT OF ANALYSIS ANALYSIS OF DETECTION (F)

(F)

(F)

NAME REPORTED MEASUREMENT)

PERFORMED PERFORMED (LLD)

RANGE RANGE RANGE DISTANCE AND DIRECTION MEASUREMENTS SURFACE WATER H-3 24 2000 498

<LLD 498 J1-2 INDICATOR 0

(PCI/LITER)

(1/2)

(1/2)

DOWNSTREAM OF TMINS LIQUID DISCHARGE OUTFALL 0.5 MILES S OF SITE I-131 12 1

2.6

<LLD 2.6 A3-2 CONTROL 0

(1/12)

(1/2)

SWATARA CREEK MIDDLETOWN 2.7 MILES N OF SITE GAMMA 24 MN-54 15

<LLD

<LLD 0

CO-58 15

<LLD

<LLD 0

FE-59 30

<LLD

<LLD 0

CO-60 15

<LLD

<LLD 0

ZN-65 30

<LLD

<LLD 0

NB-95 15

<LLD

<LLD 0

ZR-95 30

<LLD

<LLD 0

CS-134 15

<LLD

<LLD 0

CS-137 18

<LLD

<LLD 0

BA-140 60

<LLD

<LLD 0

LA-140 15

<LLD

<LLD 0

DRINKING WATER GR-B 36 4

2.6 2.3 2.6 G15-2 INDICATOR 0

(PCI/LITER)

(11/24)

(1/12)

(9/12)

WRIGHTSVILLE WATER PLANT 2.3 - 3.1 2.3 - 3.1 13.3 MILES SE OF SITE I-131 36 1

<LLD

<LLD 0

H-3 36 2000

<LLD

<LLD 0

GAMMA 36 MN-54 15

<LLD

<LLD 0

CO-58 15

<LLD

<LLD 0

FE-59 30

<LLD

<LLD 0

CO-60 15

<LLD

<LLD 0

ZN-65 30

<LLD

<LLD 0

NB-95 15

<LLD

<LLD 0

ZR-95 30

<LLD

<LLD 0

CS-134 15

<LLD

<LLD 0

CS-137 18

<LLD

<LLD 0

BA-140 60

<LLD

<LLD 0

LA-140 15

<LLD

<LLD 0

TABLE A-1 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANNUAL

SUMMARY

FOR THE THREE MILE ISLAND NUCLEAR STATION, 2021 LOCATION WITH HIGHEST ANNUAL MEAN (M)

(M) The Mean Values are calculated using the positive values. (F ) Fraction of detectable measurement are indicated in parentheses.

A-1

NAME OF FACILITY: THREE MILE ISLAND NUCLEAR STATION DOCKET NUMBER:

50-289 & 50-320 LOCATION OF FACILITY: MIDDLETOWN COUNTY, PA REPORTING PERIOD:

2021 INDICATOR CONTROL MEDIUM OR REQUIRED LOCATIONS LOCATION NUMBER OF PATHWAY SAMPLED TYPES OF NUMBER OF LOWER LIMIT MEAN (M)

MEAN (M)

MEAN (M)

STATION #

NONROUTINE (UNIT OF ANALYSIS ANALYSIS OF DETECTION (F)

(F)

(F)

NAME REPORTED MEASUREMENT)

PERFORMED PERFORMED (LLD)

RANGE RANGE RANGE DISTANCE AND DIRECTION MEASUREMENTS TABLE A-1 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANNUAL

SUMMARY

FOR THE THREE MILE ISLAND NUCLEAR STATION, 2021 LOCATION WITH HIGHEST ANNUAL MEAN (M)

EFFLUENT WATER GR-B 12 4

2.4 NA 2.4 K1-1 INDICATOR 0

(PCI/LITER)

(5/12)

(5/12)

RML-7 MAIN STATION DISCHARGE BLDG 2.1 - 2.7 2.1 - 2.7 0.2 MILES ONSITE I-131 (LOW LVL) 12 1

<LLD NA 0

H-3 12 2000 4210 NA 4210 K1-1 INDICATOR 0

(1/12)

(1/12)

RML-7 MAIN STATION DISCHARGE BLDG 0.2 MILES ONSITE SR-89 2

5

<LLD NA 0

SR-90 2

2

<LLD NA 0

GAMMA 12 MN-54 15

<LLD NA 0

CO-58 15

<LLD NA 0

FE-59 30

<LLD NA 0

CO-60 15

<LLD NA 0

ZN-65 30

<LLD NA 0

NB-95 15

<LLD NA 0

ZR-95 30

<LLD NA 0

CS-134 15

<LLD NA 0

CS-137 18

<LLD NA 0

BA-140 60

<LLD NA 0

LA-140 15

<LLD NA 0

BOTTOM FEEDER SR-90 4

10

<LLD

<LLD 0

(PCI/KGWET)

GAMMA 4

K-40 NA 2832 2648 2832 INDB INDICATOR 0

(2/2)

(2/2)

(2/2)

YORK HAVEN DAM 2505 - 3159 2512 - 2783 2505 - 3159 DOWNSTREAM OF DISCHARGE MN-54 130

<LLD

<LLD 0

CO-58 130

<LLD

<LLD 0

FE-59 260

<LLD

<LLD 0

CO-60 130

<LLD

<LLD 0

ZN-65 260

<LLD

<LLD 0

CS-134 130

<LLD

<LLD 0

CS-137 150

<LLD

<LLD 0

(M) The Mean Values are calculated using the positive values. (F ) Fraction of detectable measurement are indicated in parentheses.

A-2

NAME OF FACILITY: THREE MILE ISLAND NUCLEAR STATION DOCKET NUMBER:

50-289 & 50-320 LOCATION OF FACILITY: MIDDLETOWN COUNTY, PA REPORTING PERIOD:

2021 INDICATOR CONTROL MEDIUM OR REQUIRED LOCATIONS LOCATION NUMBER OF PATHWAY SAMPLED TYPES OF NUMBER OF LOWER LIMIT MEAN (M)

MEAN (M)

MEAN (M)

STATION #

NONROUTINE (UNIT OF ANALYSIS ANALYSIS OF DETECTION (F)

(F)

(F)

NAME REPORTED MEASUREMENT)

PERFORMED PERFORMED (LLD)

RANGE RANGE RANGE DISTANCE AND DIRECTION MEASUREMENTS TABLE A-1 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANNUAL

SUMMARY

FOR THE THREE MILE ISLAND NUCLEAR STATION, 2021 LOCATION WITH HIGHEST ANNUAL MEAN (M)

PREDATOR SR-90 4

10

<LLD

<LLD 0

(PCI/KGWET)

GAMMA 4

K-40 NA 3368 2807 3368 INDP INDICATOR 0

(2/2)

(2/2)

(2/2)

YORK HAVEN DAM 3042 - 3694 2694 - 2920 3042 - 3694 DOWNSTREAM OF DISCHARGE MN-54 130

<LLD

<LLD 0

CO-58 130

<LLD

<LLD 0

FE-59 260

<LLD

<LLD 0

CO-60 130

<LLD

<LLD 0

ZN-65 260

<LLD

<LLD 0

CS-134 130

<LLD

<LLD 0

CS-137 150

<LLD

<LLD 0

SEDIMENT GAMMA 6

(PCI/KG DRY)

K-40 NA 12349 14135 15880 J2-1 INDICATOR 0

(4/4)

(2/2)

(2/2)

YORK HAVEN DAM 7750 - 17470 12360 - 15910 14290 - 17470 1.5 MILES S OF SITE MN-54 NA

<LLD

<LLD 0

CO-58 NA

<LLD

<LLD 0

CO-60 NA

<LLD

<LLD 0

CS-134 150

<LLD

<LLD 0

CS-137 180 94

<LLD 94 J2-1 INDICATOR 0

(1/4)

(1/2)

YORK HAVEN DAM 1.5 MILES S OF SITE AIR PARTICULATE GR-B 364 10 16 17 17 Q15-1 CONTROL 0

(E-3 PCI/CU.METER)

(311/312)

(52/52)

(52/52)

WEST FAIRVIEW FIRE DEPT SOCIAL HALL 6 - 34 8 - 35 8 - 35 13.4 MILES NW OF SITE GAMMA 28 BE-7 NA 73 81 81 Q15-1 CONTROL 0

(24/24)

(4/4)

(4/4)

WEST FAIRVIEW FIRE DEPT SOCIAL HALL 53 - 93 67 - 89 67 - 89 13.4 MILES NW OF SITE MN-54 NA

<LLD

<LLD 0

CO-58 NA

<LLD

<LLD 0

CO-60 NA

<LLD

<LLD 0

NB-95 NA

<LLD

<LLD 0

ZR-95 NA

<LLD

<LLD 0

CS-134 50

<LLD

<LLD 0

CS-137 60

<LLD

<LLD 0

(M) The Mean Values are calculated using the positive values. (F ) Fraction of detectable measurement are indicated in parentheses.

A-3

NAME OF FACILITY: THREE MILE ISLAND NUCLEAR STATION DOCKET NUMBER:

50-289 & 50-320 LOCATION OF FACILITY: MIDDLETOWN COUNTY, PA REPORTING PERIOD:

2021 INDICATOR CONTROL MEDIUM OR REQUIRED LOCATIONS LOCATION NUMBER OF PATHWAY SAMPLED TYPES OF NUMBER OF LOWER LIMIT MEAN (M)

MEAN (M)

MEAN (M)

STATION #

NONROUTINE (UNIT OF ANALYSIS ANALYSIS OF DETECTION (F)

(F)

(F)

NAME REPORTED MEASUREMENT)

PERFORMED PERFORMED (LLD)

RANGE RANGE RANGE DISTANCE AND DIRECTION MEASUREMENTS TABLE A-1 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANNUAL

SUMMARY

FOR THE THREE MILE ISLAND NUCLEAR STATION, 2021 LOCATION WITH HIGHEST ANNUAL MEAN (M)

AIR IODINE GAMMA 364 (E-3 PCI/CU.METER)

I-131 70

<LLD

<LLD 0

MILK I-131 85 1

<LLD

<LLD 0

(PCI/LITER)

SR-89 17 5

<LLD

<LLD 0

SR-90 17 2

<LLD

<LLD 0

GAMMA 85 K-40 NA 1301 1211 1364 P4-1 INDICATOR 0

(64/64)

(21/21)

(22/22)

FISHER FARM 780 - 1579 631 - 1456 1173 - 1579 3.6 MILES WNW OF SITE CS-134 15

<LLD

<LLD 0

CS-137 18

<LLD

<LLD 0

BA-140 60

<LLD

<LLD 0

LA-140 15

<LLD

<LLD 0

VEGETATION SR-90 6

10

<LLD

<LLD 0

(PCI/KG WET)

GAMMA 42 BE-7 NA 1037 494 1058 E1-2 INDICATOR 0

(22/27)

(4/15)

(10/15)

TMI VISITOR'S CENTER 501 - 2272 357 - 649 501 - 1983 0.4 MILES E OF SITE K-40 NA 3647 3022 3644 E1-2 INDICATOR 0

(27/27)

(15/15)

(15/15)

TMI VISITOR'S CENTER 1603 - 5865 1234 - 5488 2209 - 5865 0.4 MILES E OF SITE I-131 60

<LLD

<LLD 0

CS-134 60

<LLD

<LLD 0

CS-137 80

<LLD

<LLD 0

DIRECT RADIATION OSLD - QUARTERLY 363 NA 17.1 18.9 27.9 H8-1 INDICATOR 0

(MILLIREM/STD.MO.)

(319/319)

(44/44)

(4/4)

SAGINAW ROAD 10.5 - 31.3 14.4 - 27.4 23.2 - 31.3 7.4 MILES SSE OF SITE (M) The Mean Values are calculated using the positive values. (F ) Fraction of detectable measurement are indicated in parentheses.

A-4

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

Intentionally left blank

TABLE B-1: Location Designation and Identification System for the Three Mile Island Nuclear Station X/YY/Z -

General code for identification of locations, where:

X Angular Sector of Sampling Location. The compass is divided into 16 sectors of 22 1/2 degrees each with center at Three Mile Island's Units 1 and 2 off-gas vents. Sector A is centered due North, and others are alphabetical in a clockwise direction.

YY Radial Zone of Sampling Location in miles.

Z Station's Numerical Designation within sector and zone, using 1, 2, 3...

in each sector and zone.

B-1

TABLE B-2:

Radiological Environmental Monitoring Program - Sampling Locations, Distance and Direction, Three Mile Island Nuclear Station, 2021 Sample Medium Station Code Map Number Distance (miles)

Azimuth Description AQS A1-3 1

0.6 359° N of site off north tip of TMI in Susquehanna River ID A1-4 1

0.3 6° N of Reactor Building on W fence adjacent to North Weather Station, TMI AP, AI, ID A3-1 2

2.7 357° N of site at Mill Street Substation SW A3-2 2

2.7 356° N of site at Swatara Creek, Middletown ID A5-1 2

4.4 3° N of site on Vine Street Exit off Route 283 ID A9-3 3

8.0 2° N of site at Duke Street Pumping Station, Hummelstown ID B1-1 1

0.6 25° NNE of site on light pole in middle of North Bridge, TMI ID B1-2 1

0.4 24° NNE of Reactor Building on top of dike, TMI ID B2-1 2

1.9 17° NNE of site on Sunset Dr. (off Hillsdale Rd.)

ID B5-1 2

4.9 19° NNE of site at intersection of School House and Miller Roads ID B10-1 3

9.2 21° NNE of site at intersection of West Areba Avenue and Mill Street, Hershey FP B10-2 3

10 31° NNE of site at Milton Hershey School, Hershey ID C1-1 1

0.7 37° NE of site along Route 441 N ID C1-2 1

0.3 50° NE of Reactor Building on top of dike, TMI ID C2-1 2

1.5 44° NE of site at Middletown Junction ID C5-1 2

4.7 43° NE of site on Kennedy Lane ID C8-1 3

7.1 48° NE of site at Schenk's Church on School House Road AQF Control All locations where finfish are collected above Dock St. Dam, Harrisburg ID D1-1 1

0.2 76° ENE of Reactor Building on top of dike, TMI ID D1-2 1

0.5 67° ENE of site off Route 441 along lane between garden center & residence ID D2-2 2

1.6 74° ENE of site along Hillsdale Rd. (S of Zion Rd.)

ID D6-1 3

5.2 66° ENE of site off Beagle Road ID D15-1 3

10.8 64° ENE of site along Route 241, Lawn AP, AI, ID, FP E1-2 1

0.4 97° E of site at TMI Visitor's Center ID E1-4 1

0.2 97° E of Reactor Building on top of dike, TMI M

E2-2 2

1.1 96° E of site at farm on Pecks Road ID E2-3 2

2.0 97° E of site along Hillsdale Rd. (N of Creek Rd.)

ID E5-1 2

4.7 82° E of site at intersection of N. Market Street (Route 230) and Zeager Road ID E7-1 3

6.7 88° E of site along Hummelstown Street, Elizabethtown ID F1-2 1

0.5 117° ESE of site near entrance to 500 kV Substation ID F1-2 1

0.2 112° ESE of Reactor Building on top of dike midway within ISWSF, TMI AP, AI F1-3 1

0.6 112° ESE of site in 500 kV Substation ID F1-4 1

0.2 122° ESE of Reactor Building on top of dike, TMI ID F2-1 2

1.3 119° ESE of site along Engle Road M

F4-1 2

3.2 104° ESE of site at farm on Turnpike Road ID F5-1 2

4.7 109° ESE of site along Amosite Road ID F10-1 3

9.4 112° ESE of site along ESE of site along Donegal Springs ID F25-1 3

22 106° ESE of site at intersection of Steel Way and Loop Roads, Lancaster ID G1-2 1

0.7 145° SE of site along Route 441 S ID G1-2 1

0.2 130° SE of Reactor Building on top of dike, TMI ID G1-5 1

0.3 143° SE of Reactor Building on top of dike, TMI ID G1-6 1

0.3 139° SE of Reactor Building on top of dike, TMI B-2

TABLE B-2:

Radiological Environmental Monitoring Program - Sampling Locations, Distance and Direction, Three Mile Island Nuclear Station, 2021 Sample Medium Station Code Map Number Distance (miles)

Azimuth Description AI, AP, M G2-1 2

1.4 126° SE of site at farm on Becker Road ID G2-4 2

1.7 138° SE of site On Becker Road ID G5-1 2

4.8 131° SE of site at intersection of Bainbridge and Risser Roads ID G10-1 3

9.7 128° SE of site at farm along Engles Tollgate Road, Marietta ID G15-1 3

14.4 126° SE of site at Columbia Water Treatment Plant DW G15-2 3

13.3 129° SE of site at Wrightsville Water Treatment Plant DW G15-3 3

15.7 124° SE of site at Lancaster Water Treatment Plant ID H1-1 1

0.5 167° SSE of site, TMI FP H1-2 1

1.0 151° SSE of site along Route 441, Red Hill Market ID H1-3 1

0.1 82° SSE of site, TMI AP, AI, ID H3-1 2

2.2 160° SSE of site in Falmouth-Collins Substation ID H5-1 2

4.1 158° SSE of site by Guard Shack at Brunner Island Steam Electric Station ID H8-1 3

7.4 163° SSE of site along Saginaw Road, Starview ID H15-1 3

13.2 157° SSE of site at intersection of Orchard and Stonewood Rds, Wilshire Hills AQF Indicator All locations where finfish are collected downstream of the TMINS liquid discharge outfall ID J1-1 1

0.8 176° S of site, TMI SW J1-2 1

0.5 188° S of site downstream of the TMINS liquid discharge outfall in Susquehanna River ID J1-3 1

0.3 189° S of Reactor Building just S of SOB, TMI ID J1-4 1

0.1 307° S of site, TMI AQS J2-1 2

1.4 179° S of site in Susquehanna River just upstream of the York Haven Dam ID J3-1 2

2.7 179° S of site at York Haven/Cly ID J5-1 2

4.9 181° S of site along Canal Road, Conewago Heights ID J7-1 3

6.5 176° S of site off of Maple Street, Manchester ID J15-1 3

12.6 183° S of site in Met-Ed York Load Dispatch Station M

J18-1 3

17.6 188° S of site at Stump Dairy on Arnold Road, York EW K1-1 1

0.2 211° On site at RML-7 Main Station Discharge Building AQS K1-3 1

0.2 213° SSW of site downstream of the TMINS liquid discharge outfall in the Susquehanna River ID K1-4 1

0.2 209° SSW of Reactor Building on top of dike behind Warehouse 2, TMI ID K1-5 1

0.1 277° SSW of site, TNI ID K2-1 2

1.2 200° SSW of site on S Shelley Island ID K3-1 2

2.0 206° SSW of site along Rt. 262, N of Cly ID K5-1 2

4.9 202° SSW of site along Conewago Creek Road, Strinestown ID K8-1 3

7.5 196° SSW of site at intersection of Coppenhaffer Rd and Route 295, Zions View ID K15-1 3

12.8 203° SSW of site behind McDonalds & next to child care center, Weiglestown M

K15-3 3

14.4 205° SSW of site at farm along S Salem Church Rd, Dover ID L1-1 1

0.1 236° SW of site on top of dike W of Mech. Draft Cooling Tower, TMI ID L1-2 1

0.5 221° SW of site on Beech Island ID L2-1 2

1.8 224° SW of site along Route 262 ID L5-1 2

4.1 228° SW of site at intersection of Stevens and Wilson Roads ID L8-1 3

8.0 225° SW of site along Rohlers Church Rd., Andersontown B-3

TABLE B-2:

Radiological Environmental Monitoring Program - Sampling Locations, Distance and Direction, Three Mile Island Nuclear Station, 2021 Sample Medium Station Code Map Number Distance (miles)

Azimuth Description ID L15-1 3

11.8 226° SW of site on W side of Route 74, rear of church, Mt. Royal ID M1-1 1

0.1 249° WSW of Reactor Building on SE corner of U-2 Screenhouse fence, TMI ID M1-2 1

0.4 252° WSW of site on E side of Shelley Island, Lot #157 AP, AI, ID M2-1 2

1.3 256° WSW of site along Route 262 and adjacent to Fishing Creek, Goldsboro ID M5-1 2

4.3 249° WSW of site at intersection of Lewisberry and Roxberry Roads, Newberrytown ID M9-1 3

8.7 243° WSW of site along Alpine Road, Maytown ID N1-1 1

0.7 274° W of site on W side of Shelley Island, between lots #13 and #14 ID N1-3 1

0.1 274° W of Reactor Bldg on fence adjacent to Screenhouse entrance gate, TMI ID N2-1 2

1.2 261° W of site at Goldsboro Marina ID N5-1 2

4.9 268° W of site off of Old York Road along Robin Hood Drive ID N8-1 3

7.7 262° W of site along Route 382, 1/2 mile north of Lewisberry ID N15-2 3

10.4 275° W of site at intersection of Lisburn Road and Main Street, Lisburn ID P1-1 1

0.4 303° WNW of site on Shelley Island ID P1-2 1

0.1 292° WNW of Reactor Building on fence N of Unit 1 Screenhouse, TMI ID P2-1 2

1.9 283° WNW of site along Route 262 M

P4-1 2

3.6 295° WNW of site at farm on Valley Road ID P5-1 2

5.0 284° WNW of site at intersection of Valley Rd (Route 262) and Beinhower Rd ID P8-1 3

7.9 292° WNW of site along Evergreen Road, Reesers Summit ID Q1-1 1

0.5 317° NW of site on E side of Shelley Island ID Q1-2 1

0.2 321° NW of Reactor Building on fence W of Warehouse 1, TMI ID Q2-1 2

1.9 310° NW of site along access road along river ID Q5-1 2

5.0 317° NW of site along Lumber Street, Highspire SW, DW, ID Q9-1 3

8.5 310° NW of site at the Steelton Water Company AP, AI, ID Q15-1 3

13.4 309° NW of site behind West Fairview Fire Dept. Social Hall (abandoned)

ID R1-1 1

0.2 335° NNW of Reactor Building along W fence, TMI ID R1-2 1

1.7 334° NNW of site on central Henry Island ID R3-1 2

2.6 341° NNW of site at Crawford Station, Middletown ID R5-1 2

4.9 339° NNW of site at intersection of Spring Garden Drive and Route 441 ID R9-1 3

8.0 341° NNW of site at intersection of Derry and 66th Streets, Rutherford Heights ID R15-1 3

11.2 332° NNW of site at intersection of Route 22 and Colonial Road, Colonial Park IDENTIFICATION KEY ID = Immersion Dose (OSLD)

EW = Effluent Water SW = Surface Water DW = Drinking Water AI = Air Iodine M = Milk (Cow)

AP = Air Particulate AQF = Finfish FP = Food Products (Green Leafy Vegetation, Fruits, Vegetables)

AQS = Aquatic Sediment B-4

TABLE B-3:

Radiological Environmental Monitoring Program - Summary of Sample Collection and Analytical Methods, Three Mile Island Nuclear Station, 2021 Sample Medium Analysis Sampling Method Collection Procedure Number Sample Size Analytical Procedure Number Surface Water Gamma Spectroscopy Monthly composite from a continuous water compositor CY-ES-240 EIS Collection of Surface-Drinking-Effluent Water Samples for Radiological Analysis (TMI) 2 gallon TBE, TBE-2007 Gamma-Emitting Radioisotope Analysis EIS, CY-ES-205 Gamma Counting Using the HPGe Detector with the Genie PC Counting System Surface Water Gross Beta Monthly composite from a continuous water compositor CY-ES-240 EIS Collection of Surface-Drinking-Effluent Water Samples for Radiological Analysis (TMI) 2 gallon TBE, TBE-2008 Gross Alpha and/or Gross Beta Activity in Various Matrices EIS, CY-ES-206 Operation of the Tennelec S5E Proportional Counter Surface Water Tritium Monthly composite from a continuous water compositor CY-ES-240 EIS Collection of Surface-Drinking-Effluent Water Samples for Radiological Analysis (TMI) 2 gallon TBE, TBE-2011 Tritium Analysis in Drinking Water by Liquid Scintillation GEL, EPA 906.0 Mod, for Tritium analysis by Liquid scintillation Surface Water Iodine-131 Monthly composite from a continuous water compositor CY-ES-240 EIS Collection of Surface-Drinking-Effluent Water Samples for Radiological Analysis (TMI) 2 gallon TBE, TBE-2012 Radioiodine in Various Matrices EIS, CY-ES-205 Gamma Counting Using the HPGe Detector with the Genie PC Counting System Drinking Water Gross Beta Monthly composite from a continuous water compositor CY-ES-240 EIS Collection of Surface-Drinking-Effluent Water Samples for Radiological Analysis (TMI) 2 gallon TBE, TBE-2008 Gross Alpha and/or Gross Beta Activity in Various Matrices Drinking Water Gamma Spectroscopy Monthly composite from a continuous water compositor CY-ES-240 EIS Collection of Surface-Drinking-Effluent Water Samples for Radiological Analysis (TMI) 2 gallon TBE, TBE-2007 Gamma-Emitting Radioisotope Analysis Drinking Water Iodine-131 Monthly composite from a continuous water compositor CY-ES-240 EIS Collection of Surface-Drinking-Effluent Water Samples for Radiological Analysis (TMI) 2 gallon TBE, TBE-2012 Radioiodine in Various Matrices Drinking Water Tritium Monthly composite from a continuous water compositor CY-ES-240 EIS Collection of Surface-Drinking-Effluent Water Samples for Radiological Analysis (TMI) 2 gallon TBE, TBE-2011 Tritium Analysis in Drinking Water by Liquid Scintillation Effluent Water Iodine-131 Monthly composite from a continuous water compositor CY-ES-240 EIS Collection of Surface-Drinking-Effluent Water Samples for Radiological Analysis (TMI) 2 gallon TBE, TBE-2012 Radioiodine in Various Matrices B-5

TABLE B-3:

Radiological Environmental Monitoring Program - Summary of Sample Collection and Analytical Methods, Three Mile Island Nuclear Station, 2021 Sample Medium Analysis Sampling Method Collection Procedure Number Sample Size Analytical Procedure Number Effluent Water Gamma Spectroscopy Monthly composite from a continuous water compositor CY-ES-240 EIS Collection of Surface-Drinking-Effluent Water Samples for Radiological Analysis (TMI) 2 gallon TBE, TBE-2007 Gamma-Emitting Radioisotope Analysis Effluent Water Tritium Monthly composite from a continuous water compositor CY-ES-240 EIS Collection of Surface-Drinking-Effluent Water Samples for Radiological Analysis (TMI) 2 gallon TBE, TBE-2011 Tritium Analysis in Drinking Water by Liquid Scintillation Effluent Water Strontium-89/90 Semi-annual composite from monthly samples TBE, TBE-2023 Compositing of Samples 2 gallon TBE, TBE-2018 Radiostrontium Analysis by Chemical Separation Storm Water Gamma Spectroscopy Quarterly composite of monthly grab samples CY-ES-240 EIS Collection of Surface-Drinking-Effluent Water Samples for Radiological Analysis (TMI) 1 gallon TBE, TBE-2007 Gamma-Emitting Radioisotope Analysis Storm Water Tritium Quarterly composite of monthly grab samples CY-ES-240 EIS Collection of Surface-Drinking-Effluent Water Samples for Radiological Analysis (TMI) 1 gallon TBE, TBE-2011 Tritium Analysis in Drinking Water by Liquid Scintillation Fish Gamma Spectroscopy Semi-annual samples collected via electroshocking or other techniques ER-TMI-13 Collection of fish samples for radiological analysis (TMINS) 1000 grams (wet)

TBE, TBE-2007 Gamma-Emitting Radioisotope Analysis EIS, CY-ES-205 Gamma Counting Using the HPGe Detector with the Genie PC Counting System Fish Strontium-90 Semi-annual samples collected via electroshocking or other techniques ER-TMI-13 Collection of fish samples for radiological analysis (TMINS) 1000 grams (wet)

TBE, TBE-2018 Radiostrontium Analysis by Chemical Separation GEL, EPA 905.0 Mod/DOE RP501 Rev. 1 Mod Sediment Gamma Spectroscopy Semi-annual grab samples ER-TMI-03 Collection of sediment samples for radiological analysis (TMINS) 500 grams (dry)

TBE, TBE-2007 Gamma-Emitting Radioisotope Analysis EIS, CY-ES-205 Gamma Counting Using the HPGe Detector with the Genie PC Counting System Air Particulates Gamma Spectroscopy Quarterly composite of each station TBE, TBE-2023 Compositing of Samples CY-ES-204 Sample Preparation for Gamma and Beta Counting 13 filters (approx.. 3600 cubic meters)

TBE, TBE-2007 Gamma-Emitting Radioisotope Analysis EIS, CY-ES-205 Gamma Counting Using the HPGe Detector with the Genie PC Counting System B-6

TABLE B-3:

Radiological Environmental Monitoring Program - Summary of Sample Collection and Analytical Methods, Three Mile Island Nuclear Station, 2021 Sample Medium Analysis Sampling Method Collection Procedure Number Sample Size Analytical Procedure Number Air Particulates Gross Beta One-week composite of continuous air sampling through glass fiber filter paper CY-ES-237 Collection of Air Iodine &

Air Particulate for Radiological Analysis (TMI) 1 filter (approx.. 280 cubic meters weekly)

TBE, TBE-2008 Gross Alpha and/or Gross Beta Activity in Various Matrices CY-ES-206 Operation of the Tennelec S5E Proportional Counter Air Iodine Gamma Spectroscopy One-week composite of continuous air sampling through charcoal filter CY-ES-237 Collection of Air Iodine &

Air Particulate for Radiological Analysis (TMI) 1 filter (approx. 280 cubic meters weekly)

TBE, TBE-2007 Gamma-Emitting Radioisotope Analysis EIS, CY-ES-205 Gamma Counting Using the HPGe Detector with the Genie PC Counting System Milk I-131 Bi-weekly grab sample when cows are on pasture.

Monthly all other times CY-ES-238 Sample Collection for Radiological Analysis - Milk (TMI) 2 gallon TBE, TBE-2012 Radioiodine in Various Matrices EIS, CY-ES-205 Gamma Counting Using the HPGe Detector with the Genie PC Counting System Milk Sr-89/90 Quarterly composite of bi-weekly and monthly grab samples TBE, TBE-2023 Compositing of Samples CY-ES-238 Sample Collection for Radiological Analysis - Milk (TMI) 2 gallon TBE, TBE-2019 Radiostrontium Analysis by Ion Exchange GEL, EPA 905.0 Mod/DOE RP501 Rev. 1 Mod Milk Gamma Spectroscopy Bi-weekly grab sample when cows are on pasture.

Monthly all other times CY-ES-238 Sample Collection for Radiological Analysis - Milk (TMI) 2 gallon TBE, TBE-2007 Gamma-Emitting Radioisotope Analysis EIS, CY-ES-205 Gamma Counting Using the HPGe Detector with the Genie PC Counting System Vegetation Gamma Spectroscopy Monthly and annual grab sample CY-ES-241 Sample Collection for Gamma Counting - Vegetation (TMI) 1000 grams TBE, TBE-2007 Gamma-Emitting Radioisotope Analysis EIS, CY-ES-205 Gamma Counting Using the HPGe Detector with the Genie PC Counting System Vegetation Strontium-89/90 Monthly and annual grab sample CY-ES-241 Sample Collection for Gamma Counting - Vegetation (TMI) 1000 grams TBE, TBE-2018 Radiostrontium Analysis by Chemical Separation GEL, EPA 905.0 Mod/DOE RP501 Rev. 1 Mod OSLD Optically Stimulated Luminescence Dosimetry Quarterly OSLDs comprised of two Al2O3:C Landauer Incorporated elements.

CY-ES-239 Collection of OSLD samples for radiological analysis (TMINS) 2 badges with 3 dosimeters Landauer Incorporated B-7

Figure B-1 Environmental Sampling Locations Within One Mile of the Three Mile Island Nuclear Station, 2021 B-8

Figure B-2 Environmental Sampling Locations Between One and Five Miles of the Three Mile Island Nuclear Station, 2021 B-9

Figure B-3 Environmental Sampling Locations Greater than Five Miles of the Three Mile Island Nuclear Station, 2021 B-10

APPENDIX C DATA TABLES AND FIGURES PRIMARY LABORATORY

Intentionally left blank

Table C-I.1 Q9-1 12/29/20 - 01/28/21

< 164

< 163 01/28/21 - 02/25/21 498 +/- 133

< 179 02/25/21 - 04/01/21

< 169

< 173 04/01/21 - 04/29/21

< 186

< 183 04/29/21 - 05/27/21

< 188

< 189 05/27/21 - 07/01/21

< 187

< 184 07/01/21 - 07/29/21

< 179

< 175 07/29/21 - 09/02/21

< 179

< 179 09/02/21 - 09/30/21

< 193

< 194 09/30/21 - 10/28/21

< 170

< 195 10/28/21 - 12/02/21

< 184

< 197 12/02/21 - 12/29/21

< 191

< 187 MEAN +/- 2 STD DEV 498 +/- 0 Table C-I.2 A3-2 12/29/20 - 01/28/21 2.6 +/- 0.7 01/28/21 - 02/25/21

< 0.8 02/25/21 - 04/01/21

< 0.9 04/01/21 - 04/29/21

< 0.8 04/29/21 - 05/27/21

< 0.9 05/27/21 - 07/01/21

< 0.8 07/01/21 - 07/29/21

< 0.7 07/29/21 - 09/02/21

< 0.8 09/02/21 - 09/30/21

< 0.8 09/30/21 - 10/28/21

< 0.9 10/28/21 - 12/02/21

< 0.9 12/02/21 - 12/29/21

< 0.9 MEAN +/- 2 STD DEV 2.6 +/- 0 THE MEAN AND TWO STANDARD DEVIATION ARE CALCULATED USING THE POSITIVE VALUES CONCENTRATIONS OF TRITIUM IN SURFACE WATER SAMPLES COLLECTED IN THE VICINITY OF THREE MILE ISLAND NUCLEAR STATION, 2021 J1-2 CONCENTRATIONS OF I-131 IN SURFACE WATER SAMPLES COLLECTED IN THE VICINITY OF THREE MILE ISLAND NUCLEAR STATION, 2021 COLLECTION PERIOD COLLECTION PERIOD RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA C-1

Table C-I.3 SITE Nb-95 Zr-95 Cs-134 Cs-137 J1-2 12/29/20 - 01/28/21

< 8

< 8

< 16

< 9

< 17

< 6

< 13

< 7

< 7

< 26

< 12 01/28/21 - 02/25/21

< 6

< 6

< 13

< 8

< 13

< 5

< 10

< 7

< 6

< 26

< 11 02/25/21 - 04/01/21

< 6

< 7

< 13

< 7

< 14

< 6

< 9

< 7

< 6

< 29

< 9 04/01/21 - 04/29/21

< 4

< 5

< 8

< 4

< 10

< 5

< 7

< 5

< 5

< 22

< 6 04/29/21 - 05/27/21

< 4

< 5

< 11

< 4

< 9

< 5

< 6

< 5

< 5

< 20

< 6 05/27/21 - 07/01/21

< 6

< 8

< 16

< 7

< 12

< 6

< 15

< 8

< 8

< 36

< 11 07/01/21 - 07/29/21

< 7

< 4

< 10

< 4

< 12

< 6

< 9

< 6

< 6

< 28

< 7 07/29/21 - 09/02/21

< 5

< 6

< 14

< 5

< 13

< 7

< 11

< 7

< 7

< 36

< 12 09/02/21 - 09/30/21

< 5

< 6

< 12

< 5

< 12

< 7

< 10

< 8

< 6

< 27

< 10 09/30/21 - 10/28/21

< 5

< 7

< 15

< 7

< 12

< 6

< 10

< 6

< 6

< 24

< 9 10/28/21 - 12/02/21

< 6

< 7

< 13

< 5

< 12

< 7

< 9

< 8

< 7

< 30

< 7 12/02/21 - 12/29/21

< 5

< 6

< 13

< 9

< 12

< 7

< 17

< 7

< 6

< 30

< 11 MEAN Q9-1 12/29/20 - 01/28/21

< 8

< 8

< 13

< 7

< 10

< 8

< 12

< 7

< 8

< 35

< 10 01/28/21 - 02/25/21

< 7

< 7

< 13

< 9

< 13

< 7

< 11

< 5

< 8

< 27

< 9 02/25/21 - 04/01/21

< 7

< 6

< 11

< 5

< 11

< 6

< 11

< 7

< 7

< 25

< 11 04/01/21 - 04/29/21

< 7

< 8

< 14

< 6

< 15

< 8

< 9

< 8

< 7

< 26

< 11 04/29/21 - 05/27/21

< 7

< 5

< 14

< 7

< 12

< 7

< 11

< 7

< 7

< 24

< 10 05/27/21 - 07/01/21

< 6

< 7

< 9

< 6

< 12

< 6

< 10

< 7

< 6

< 24

< 7 07/01/21 - 07/29/21

< 6

< 6

< 16

< 6

< 14

< 4

< 11

< 8

< 6

< 36

< 12 07/29/21 - 09/02/21

< 7

< 6

< 17

< 5

< 13

< 6

< 13

< 6

< 6

< 33

< 8 09/02/21 - 09/30/21

< 5

< 5

< 10

< 6

< 8

< 4

< 10

< 6

< 6

< 27

< 7 09/30/21 - 10/28/21

< 7

< 6

< 10

< 4

< 14

< 6

< 11

< 5

< 6

< 26

< 9 10/28/21 - 12/02/21

< 6

< 5

< 14

< 6

< 8

< 5

< 8

< 8

< 6

< 28

< 8 12/02/21 - 12/29/21

< 5

< 5

< 11

< 7

< 14

< 6

< 11

< 7

< 5

< 31

< 10 MEAN Co-60 Zn-65 CONCENTRATIONS OF GAMMA EMITTERS IN SURFACE WATER SAMPLES COLLECTED IN THE VICINITY OF THREE MILE ISLAND NUCLEAR STATION, 2021 RESULTS IN UNITS OF PCI/LITER + 2 SIGMA Fe-59 Ba-140 La-140 COLLECTION PERIOD Mn-54 Co-58 C-2

Table C-II.1 COLLECTION PERIOD 12/29/20 - 01/28/21

< 2.3

< 2.2

< 2.2 01/28/21 - 02/25/21 2.3 +/- 1.4

< 2.0

< 1.9 02/25/21 - 04/01/21 2.9 +/- 1.5

< 1.9

< 1.9 04/01/21 - 04/29/21 2.6 +/- 1.4

< 1.9 2.3 +/- 1.3 04/29/21 - 05/27/21

< 1.9

< 1.8

< 1.8 05/27/21 - 07/01/21 2.5 +/- 1.6

< 2.3

< 2.2 07/01/21 - 07/29/21 2.4 +/- 1.6 2.3 +/- 1.5

< 2.1 07/29/21 - 09/02/21

< 2.5

< 2.4

< 2.4 09/02/21 - 09/30/21 3.1 +/- 1.6 2.5 +/- 1.5

< 2.0 09/30/21 - 10/28/21 2.3 +/- 1.4

< 1.7

< 1.7 10/28/21 - 12/02/21 3.0 +/- 1.6

< 2.1

< 2.1 12/02/21 - 12/29/21 2.8 +/- 1.5

< 2.0

< 2.2 MEAN +/- 2 STD DEV 2.6 +/- 0.6 2.4 +/- 0.2 2.3 +/- 0 Table C-II.2 COLLECTION PERIOD 12/29/20 - 01/28/21

< 0.7

< 0.7

< 0.8 01/28/21 - 02/25/21

< 0.8

< 0.8

< 0.9 02/25/21 - 04/01/21

< 0.9

< 0.9

< 1.0 04/01/21 - 04/29/21

< 0.9

< 0.9

< 0.9 04/29/21 - 05/27/21

< 0.9

< 0.9

< 0.8 05/27/21 - 07/01/21

< 0.6

< 0.7

< 0.7 07/01/21 - 07/29/21

< 0.8

< 0.8

< 0.9 07/29/21 - 09/02/21

< 0.9

< 0.9

< 0.8 09/02/21 - 09/30/21

< 0.9

< 0.8

< 0.9 09/30/21 - 10/28/21

< 0.9

< 0.9

< 0.9 10/28/21 - 12/02/21

< 1.0

< 0.8

< 0.8 12/02/21 - 12/29/21

< 0.9

< 0.8

< 0.9 MEAN Table C-II.3 COLLECTION PERIOD 12/29/20 - 01/28/21

< 166

< 165

< 162 01/28/21 - 02/25/21

< 181

< 180

< 174 02/25/21 - 04/01/21

< 165

< 170

< 169 04/01/21 - 04/29/21

< 180

< 179

< 178 04/29/21 - 05/27/21

< 189

< 187

< 191 05/27/21 - 07/01/21

< 194

< 193

< 191 07/01/21 - 07/29/21

< 184

< 178

< 180 07/29/21 - 09/02/21

< 178

< 177

< 178 09/02/21 - 09/30/21

< 190

< 193

< 191 09/30/21 -

10/28/21

< 173

< 182

< 183 10/28/21 -

12/02/21

< 173

< 194

< 176 12/02/21 -

12/29/21

< 172

< 180

< 177 MEAN +/- 2 STD DEV THE MEAN AND TWO STANDARD DEVIATION ARE CALCULATED USING THE POSITIVE VALUES Q9-1 G15-3 G15-2 CONCENTRATIONS OF GROSS BETA IN DRINKING WATER SAMPLES COLLECTED IN THE VICINITY OF THREE MILE ISLAND NUCLEAR STATION, 2021 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA CONCENTRATIONS OF TRITIUM IN DRINKING WATER SAMPLES COLLECTED IN THE VICINITY OF THREE MILE ISLAND NUCLEAR STATION, 2021 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA CONCENTRATIONS OF I-131 IN DRINKING WATER SAMPLES G15-2 G15-3 Q9-1 G15-2 G15-3 Q9-1 COLLECTED IN THE VICINITY OF THREE MILE ISLAND NUCLEAR STATION, 2021 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA C-3

Table C-II.4 COLLECTION SITE PERIOD Co-58 Fe-59 Zn-65 Nb-95 Zr-95 G15-2 12/29/20 - 01/28/21

< 6

< 7

< 15

< 7

< 17

< 6

< 10

< 7

< 6

< 27

< 12 01/28/21 - 02/25/21

< 6

< 6

< 14

< 7

< 14

< 7

< 13

< 7

< 6

< 26

< 9 02/25/21 - 04/01/21

< 7

< 6

< 14

< 10

< 16

< 9

< 13

< 8

< 7

< 31

< 10 04/01/21 - 04/29/21

< 8

< 6

< 11

< 8

< 13

< 7

< 10

< 7

< 7

< 23

< 6 04/29/21 - 05/27/21

< 6

< 5

< 13

< 5

< 13

< 7

< 11

< 5

< 7

< 32

< 7 05/27/21 - 07/01/21

< 6

< 6

< 16

< 6

< 12

< 7

< 15

< 8

< 7

< 31

< 10 07/01/21 - 07/29/21

< 8

< 8

< 16

< 6

< 18

< 8

< 13

< 7

< 7

< 27

< 11 07/29/21 - 09/02/21

< 6

< 6

< 11

< 5

< 12

< 8

< 13

< 6

< 6

< 32

< 12 09/02/21 - 09/30/21

< 5

< 6

< 16

< 6

< 13

< 6

< 10

< 4

< 7

< 35

< 14 09/30/21 - 10/28/21

< 6

< 5

< 12

< 9

< 10

< 6

< 11

< 7

< 5

< 23

< 8 10/28/21 - 12/02/21

< 5

< 4

< 12

< 6

< 13

< 6

< 11

< 6

< 7

< 20

< 9 12/02/21 - 12/29/21

< 7

< 5

< 17

< 7

< 9

< 7

< 10

< 7

< 7

< 27

< 11 MEAN G15-3 12/29/20 - 01/28/21

< 5

< 7

< 13

< 8

< 12

< 7

< 9

< 8

< 8

< 26

< 11 01/28/21 - 02/25/21

< 6

< 5

< 10

< 7

< 9

< 5

< 9

< 5

< 6

< 24

< 12 02/25/21 - 04/01/21

< 8

< 6

< 11

< 9

< 10

< 7

< 11

< 8

< 9

< 28

< 9 04/01/21 - 04/29/21

< 8

< 10

< 14

< 7

< 17

< 9

< 13

< 7

< 9

< 29

< 12 04/29/21 - 05/27/21

< 7

< 7

< 15

< 10

< 16

< 8

< 13

< 8

< 9

< 35

< 14 05/27/21 - 07/01/21

< 6

< 6

< 18

< 10

< 11

< 8

< 9

< 7

< 5

< 34

< 14 07/01/21 - 07/29/21

< 6

< 5

< 13

< 6

< 13

< 6

< 10

< 7

< 8

< 30

< 11 07/29/21 - 09/02/21

< 6

< 6

< 9

< 6

< 10

< 6

< 9

< 6

< 6

< 32

< 8 09/02/21 - 09/30/21

< 6

< 4

< 16

< 4

< 16

< 7

< 13

< 7

< 5

< 34

< 10 09/30/21 - 10/28/21

< 6

< 6

< 11

< 8

< 13

< 7

< 13

< 7

< 6

< 31

< 10 10/28/21 - 12/02/21

< 6

< 6

< 10

< 6

< 15

< 7

< 11

< 5

< 5

< 29

< 8 12/02/21 - 12/29/21

< 6

< 6

< 17

< 5

< 13

< 5

< 13

< 8

< 7

< 23

< 10 MEAN Q9-1 12/29/20 -

01/28/21

< 7

< 6

< 12

< 8

< 15

< 6

< 12

< 7

< 9

< 25

< 9 01/28/21 -

02/25/21

< 6

< 8

< 18

< 4

< 10

< 8

< 15

< 8

< 9

< 28

< 10 02/25/21 -

04/01/21

< 8

< 7

< 16

< 6

< 11

< 6

< 10

< 8

< 6

< 29

< 9 04/01/21 -

04/29/21

< 7

< 7

< 15

< 6

< 11

< 6

< 12

< 7

< 8

< 32

< 11 04/29/21 -

05/27/21

< 6

< 7

< 16

< 6

< 10

< 6

< 14

< 7

< 6

< 28

< 11 05/27/21 -

07/01/21

< 4

< 5

< 7

< 6

< 11

< 5

< 8

< 5

< 5

< 22

< 9 07/01/21 - 07/29/21

< 7

< 7

< 17

< 12

< 16

< 10

< 9

< 9

< 7

< 38

< 11 07/29/21 - 09/02/21

< 7

< 7

< 13

< 6

< 13

< 6

< 11

< 7

< 6

< 30

< 11 09/02/21 - 09/30/21

< 7

< 5

< 14

< 5

< 11

< 6

< 13

< 6

< 5

< 29

< 11 09/30/21 - 10/28/21

< 6

< 5

< 14

< 9

< 15

< 7

< 11

< 8

< 6

< 34

< 9 10/28/21 - 12/02/21

< 6

< 6

< 13

< 7

< 14

< 6

< 11

< 7

< 7

< 29

< 5 12/02/21 - 12/29/21

< 4

< 7

< 8

< 9

< 13

< 8

< 13

< 5

< 6

< 27

< 10 MEAN CONCENTRATIONS OF GAMMA EMITTERS IN DRINKING WATER SAMPLES COLLECTED COLLECTED IN THE VICINITY OF THREE MILE ISLAND NUCLEAR STATION, 2021 RESULTS IN UNITS OF PCI/LITER + 2 SIGMA Mn-54 Co-60 Cs-134 Cs-137 Ba-140 La-140 C-4

Table C-III.1 COLLECTION SITE PERIOD K1-1 12/29/20 - 01/28/21

< 2.1

< 0.8

< 164 01/28/21 - 02/25/21 2.7 +/- 1.4

< 0.8 4210 +/- 480 02/25/21 - 04/01/21 2.1 +/- 1.3

< 0.8

< 168 04/01/21 - 04/29/21

< 1.8

< 0.9

< 185 04/29/21 - 05/27/21

< 1.8

< 0.9

< 191 05/27/21 - 07/01/21

< 2.3

< 0.6

< 182 12/29/20 - 07/01/21

< 3.2

< 0.6 07/01/21 - 07/29/21

< 2.1

< 0.7

< 181 07/29/21 - 09/02/21

< 2.6

< 0.8

< 176 09/02/21 - 09/30/21 2.6 +/- 1.4

< 0.9

< 191 09/30/21 - 10/28/21 2.3 +/- 1.3

< 0.8

< 185 10/28/21 - 12/02/21 2.4 +/- 1.4

< 1.0

< 178 12/02/21 - 12/29/21

< 1.9

< 0.9

< 188 07/01/21 - 12/29/21

< 4.6

< 0.7 MEAN +/- 2 STD DEV 2.4 +/- 0.4 4210 +/- 0 THE MEAN AND TWO STANDARD DEVIATION ARE CALCULATED USING THE POSITIVE VALUES I-131 H-3 SR-89 SR-90 CONCENTRATIONS OF GROSS BETA, IODINE-131, TRITIUM AND STRONTIUM IN EFFLUENT WATER SAMPLES COLLECTED IN THE VICINITY OF THREE MILE ISLAND NUCLEAR STATION, 2021 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA GR-B C-5

Table C-III.2 COLLECTION SITE PERIOD TM-EW-K1-1 12/29/20 - 01/28/21

< 8

< 7

< 16

< 8

< 12

< 7

< 11

< 6

< 6

< 26

< 9 01/28/21 - 02/25/21

< 5

< 5

< 7

< 6

< 9

< 3

< 6

< 5

< 5

< 19

< 6 02/25/21 - 04/01/21

< 7

< 6

< 14

< 9

< 12

< 6

< 11

< 7

< 8

< 31

< 10 04/01/21 - 04/29/21

< 9

< 7

< 14

< 8

< 18

< 7

< 13

< 8

< 7

< 32

< 12 04/29/21 - 05/27/21

< 6

< 5

< 10

< 4

< 13

< 6

< 12

< 6

< 6

< 39

< 11 05/27/21 - 07/01/21

< 6

< 5

< 15

< 6

< 11

< 6

< 11

< 7

< 7

< 27

< 12 07/01/21 - 07/29/21

< 6

< 5

< 14

< 5

< 11

< 7

< 11

< 9

< 7

< 23

< 8 07/29/21 - 09/02/21

< 7

< 6

< 17

< 8

< 14

< 7

< 13

< 6

< 7

< 32

< 11 09/02/21 - 09/30/21

< 8

< 8

< 19

< 9

< 12

< 9

< 14

< 11

< 9

< 37

< 10 09/30/21 - 10/28/21

< 4

< 4

< 6

< 5

< 9

< 4

< 6

< 5

< 5

< 19

< 7 10/28/21 - 12/02/21

< 6

< 6

< 15

< 6

< 14

< 7

< 13

< 7

< 7

< 28

< 10 12/02/21 - 12/29/21

< 6

< 8

< 18

< 5

< 12

< 7

< 10

< 7

< 7

< 39

< 9 MEAN CONCENTRATIONS OF GAMMA EMITTERS IN EFFLUENT WATER SAMPLES COLLECTED IN THE VICINITY OF THREE MILE ISLAND NUCLEAR STATION, 2021 RESULTS IN UNITS OF PCI/LITER + 2 SIGMA Zr-95 Cs-134 Cs-137 Ba-140 La-140 Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 C-6

Table C-IV.1 CONCENTRATIONS OF STRONTIUM IN PREDATOR AND BOTTOM COLLECTION PERIOD Sr-90 06/10/21

< 4.1 10/20/21

< 3.7 MEAN 06/10/21

< 4.1 10/20/21

< 4.4 MEAN 06/08/21

< 4.6 10/18/21

< 4.2 MEAN 06/08/21

< 4.4 10/18/21

< 4.3 MEAN BOTTOM FEEDER PREDATOR INDP BKGP RESULTS IN UNITS OF PCI/KG WET +/- 2 SIGMA FEEDER (FISH) SAMPLES COLLECTED IN THE VICINITY SITE BKGB INDB BOTTOM FEEDER PREDATOR OF THREE MILE ISLAND NUCLEAR STATION, 2021 C-7

Table C-IV.2 COLLECTION SITE PERIOD K-40 BKGB BOTTOM FEEDER 06/10/21 2512 +/- 993

< 76

< 60

< 143

< 71

< 150

< 57

< 68 10/20/21 2783 +/- 1043

< 65

< 60

< 143

< 105

< 143

< 73

< 60 MEAN +/- 2 STD DEV 2648 +/- 383 BKGP PREDATOR 06/10/21 2920 +/- 905

< 54

< 51

< 133

< 58

< 130

< 58

< 49 10/20/21 2694 +/- 833

< 52

< 69

< 181

< 66

< 149

< 54

< 55 MEAN +/- 2 STD DEV 2807 +/- 320 INDB BOTTOM FEEDER 06/08/21 2505 +/- 919

< 51

< 61

< 111

< 57

< 112

< 71

< 62 10/18/21 3159 +/- 1032

< 79

< 70

< 162

< 72

< 159

< 89

< 66 MEAN +/- 2 STD DEV 2832 +/- 925 INDP PREDATOR 06/08/21 3694 +/- 1064

< 56

< 53

< 130

< 58

< 120

< 73

< 63 10/18/21 3042 +/- 794

< 51

< 51

< 91

< 56

< 130

< 60

< 58 MEAN +/- 2 STD DEV 3368 +/- 922 THE MEAN AND TWO STANDARD DEVIATION ARE CALCULATED USING THE POSITIVE VALUES Co-60 Fe-59 Co-58 Mn-54 CONCENTRATIONS OF GAMMA EMITTERS IN PREDATOR AND BOTTOM FEEDER (FISH) SAMPLES COLLECTED IN THE VICINITY OF THREE MILE ISLAND NUCLEAR STATION, 2021 Cs-137 Cs-134 RESULTS IN UNITS OF PCI/KG WET +/- 2 SIGMA Zn-65 C-8

Table C-V.1 COLLECTED IN THE VICINITY OF THREE MILE ISLAND NUCLEAR STATION, 2021 COLLECTION SITE PERIOD A1-3 06/18/21 12360 +/- 1114

< 43

< 40

< 44

< 63

< 48 11/02/21 15910 +/- 1735

< 66

< 79

< 79

< 116

< 91 MEAN +/- 2 STD DEV 14135 +/- 5020 J2-1 06/18/21 14290 +/- 1143

< 30

< 35

< 42

< 51 94 +/- 46 11/02/21 17470 +/- 1947

< 89

< 95

< 93

< 120

< 106 MEAN +/- 2 STD DEV 15880 + 4497 94 +/- 0 K1-3 06/18/21 7750 +/- 882

< 46

< 42

< 45

< 54

< 49 11/02/21 9887 +/- 1426

< 88

< 77

< 81

< 93

< 92 MEAN +/- 2 STD DEV 8819 +/- 3022 THE MEAN AND TWO STANDARD DEVIATION ARE CALCULATED USING THE POSITIVE VALUES CONCENTRATIONS OF GAMMA EMITTERS IN SEDIMENT SAMPLES RESULTS IN UNITS OF PCI/KG DRY +/- 2 SIGMA Mn-54 K-40 Co-58 Co-60 Cs-134 Cs-137 C-9

Table C-VI.1 COLLECTION GROUP III PERIOD E1-2 F1-3 A3-1 G2-1 H3-1 M2-1 Q15-1 12/29/20 - 01/06/21 8 +/- 3 9 +/- 3 10 +/- 3 10 +/- 3 12 +/- 4 12 +/- 4 12 +/- 4 01/06/21 - 01/14/21 20 +/- 4 18 +/- 4 14 +/- 3 17 +/- 4 18 +/- 4 18 +/- 4 16 +/- 4 01/14/21 - 01/21/21 15 +/- 4 16 +/- 4 16 +/- 4 18 +/- 4 17 +/- 4 18 +/- 4 17 +/- 4 01/21/21 - 01/28/21 11 +/- 4 9 +/- 4 9 +/- 3 10 +/- 4 10 +/- 4 11 +/- 4 10 +/- 4 01/28/21 - 02/04/21 7 +/- 3 8 +/- 3 7 +/- 3 12 +/- 4 8 +/- 3 10 +/- 3 10 +/- 3 02/04/21 - 02/11/21 22 +/- 4 19 +/- 4 19 +/- 4 19 +/- 4 21 +/- 4 16 +/- 4 18 +/- 4 02/11/21 - 02/19/21 19 +/- 4 18 +/- 4 15 +/- 3 20 +/- 4 18 +/- 4 21 +/- 4 20 +/- 4 02/19/21 - 02/25/21 19 +/- 5 18 +/- 5 18 +/- 4 21 +/- 5 17 +/- 5 17 +/- 5 19 +/- 5 02/25/21 - 03/04/21 10 +/- 4 11 +/- 4 10 +/- 4 8 +/- 4 11 +/- 3 15 +/- 4 11 +/- 4 03/04/21 - 03/11/21 18 +/- 4 16 +/- 4 14 +/- 4 19 +/- 4 16 +/- 4 16 +/- 4 15 +/- 4 03/11/21 - 03/18/21 25 +/- 5 17 +/- 4 17 +/- 4 17 +/- 4 20 +/- 4 17 +/- 4 19 +/- 4 03/18/21 - 03/25/21 15 +/- 5 13 +/- 4 13 +/- 4 12 +/- 4 14 +/- 4 16 +/- 5 12 +/- 4 03/25/21 - 04/01/21 13 +/- 4 15 +/- 4 13 +/- 4 13 +/- 4 17 +/- 4 16 +/- 4 17 +/- 4 04/01/21 - 04/08/21 23 +/- 5 17 +/- 4 18 +/- 4 21 +/- 5 21 +/- 5 27 +/- 5 22 +/- 5 04/08/21 - 04/14/21 6 +/- 4 6 +/- 4

< 5 6 +/- 4 6 +/- 4 6 +/- 4 8 +/- 4 04/14/21 - 04/21/21 16 +/- 5 10 +/- 4 9 +/- 4 12 +/- 4 13 +/- 4 11 +/- 4 13 +/- 4 04/21/21 - 04/29/21 21 +/- 4 22 +/- 4 20 +/- 4 21 +/- 4 25 +/- 4 21 +/- 4 23 +/- 4 04/29/21 - 05/06/21 11 +/- 4 9 +/- 4 12 +/- 4 12 +/- 4 14 +/- 4 12 +/- 4 11 +/- 4 05/06/21 - 05/14/21 10 +/- 3 8 +/- 3 10 +/- 3 12 +/- 3 9 +/- 3 11 +/- 3 10 +/- 3 05/14/21 - 05/19/21 18 +/- 5 18 +/- 5 21 +/- 6 20 +/- 6 17 +/- 5 18 +/- 5 21 +/- 6 05/19/21 - 05/27/21 21 +/- 4 19 +/- 4 20 +/- 5 16 +/- 4 18 +/- 4 20 +/- 4 19 +/- 4 05/27/21 - 06/03/21 10 +/- 4 7 +/- 3 11 +/- 4 11 +/- 4 8 +/- 3 9 +/- 4 9 +/- 4 06/03/21 - 06/10/21 17 +/- 4 15 +/- 4 17 +/- 4 14 +/- 4 12 +/- 4 16 +/- 4 15 +/- 4 06/10/21 - 06/17/21 11 +/- 4 13 +/- 4 11 +/- 4 13 +/- 4 11 +/- 4 11 +/- 4 12 +/- 4 06/17/21 - 06/24/21 14 +/- 4 18 +/- 5 14 +/- 4 16 +/- 4 12 +/- 4 17 +/- 4 14 +/- 4 06/24/21 - 07/01/21 8 +/- 3 7 +/- 3 11 +/- 4 7 +/- 3 8 +/- 3 8 +/- 3 9 +/- 3 07/01/21 - 07/08/21 17 +/- 4 19 +/- 4 17 +/- 4 18 +/- 4 15 +/- 4 16 +/- 4 20 +/- 4 07/08/21 - 07/14/21 10 +/- 4 14 +/- 5 14 +/- 5 12 +/- 4 12 +/- 4 14 +/- 5 13 +/- 5 07/14/21 - 07/22/21 17 +/- 4 16 +/- 4 17 +/- 4 13 +/- 4 15 +/- 4 15 +/- 4 16 +/- 4 07/22/21 - 07/29/21 17 +/- 4 19 +/- 4 19 +/- 5 23 +/- 5 17 +/- 4 21 +/- 5 17 +/- 4 07/29/21 - 08/05/21 18 +/- 4 15 +/- 4 19 +/- 4 18 +/- 4 19 +/- 4 13 +/- 4 16 +/- 4 08/05/21 - 08/11/21 21 +/- 5 21 +/- 5 24 +/- 5 25 +/- 5 24 +/- 5 23 +/- 5 25 +/- 5 08/11/21 - 08/18/21 17 +/- 4 15 +/- 4 16 +/- 4 14 +/- 4 17 +/- 4 18 +/- 4 15 +/- 4 08/18/21 - 08/26/21 15 +/- 4 19 +/- 4 21 +/- 4 15 +/- 4 13 +/- 4 17 +/- 4 21 +/- 4 08/26/21 - 09/02/21 15 +/- 4 17 +/- 4 19 +/- 5 15 +/- 4 16 +/- 4 15 +/- 4 15 +/- 4 09/02/21 - 09/10/21 15 +/- 4 17 +/- 4 16 +/- 4 18 +/- 4 15 +/- 4 17 +/- 4 16 +/- 4 09/10/21 - 09/17/21 21 +/- 4 22 +/- 4 19 +/- 4 18 +/- 4 26 +/- 5 25 +/- 5 21 +/- 4 09/17/21 - 09/23/21 15 +/- 5 19 +/- 5 14 +/- 5 10 +/- 5 17 +/- 5 15 +/- 5 15 +/- 5 09/23/21 - 09/30/21 19 +/- 4 18 +/- 4 18 +/- 4 21 +/- 5 14 +/- 4 17 +/- 4 18 +/- 4 09/30/21 - 10/07/21 13 +/- 4 11 +/- 4 12 +/- 4 14 +/- 4 15 +/- 4 15 +/- 4 13 +/- 4 10/07/21 - 10/13/21 16 +/- 5 16 +/- 4 15 +/- 4 16 +/- 4 16 +/- 4 17 +/- 5 18 +/- 5 10/13/21 - 10/21/21 23 +/- 5 20 +/- 4 20 +/- 4 23 +/- 5 22 +/- 4 20 +/- 4 23 +/- 5 10/21/21 - 10/28/21 18 +/- 5 16 +/- 4 21 +/- 5 19 +/- 5 16 +/- 4 20 +/- 5 21 +/- 5 10/28/21 - 11/04/21 10 +/- 4 10 +/- 4 14 +/- 4 12 +/- 4 11 +/- 4 11 +/- 4 14 +/- 4 11/04/21 - 11/12/21 26 +/- 4 25 +/- 4 28 +/- 5 23 +/- 4 26 +/- 4 20 +/- 4 26 +/- 5 11/12/21 - 11/18/21 15 +/- 5 19 +/- 5 19 +/- 5 12 +/- 4 14 +/- 5 18 +/- 5 18 +/- 5 11/18/21 - 11/24/21 10 +/- 5 13 +/- 5 9 +/- 5 15 +/- 5 14 +/- 5 11 +/- 5 14 +/- 5 11/24/21 - 12/02/21 16 +/- 4 16 +/- 4 17 +/- 4 16 +/- 4 16 +/- 4 18 +/- 4 19 +/- 4 12/02/21 - 12/10/21 18 +/- 4 21 +/- 4 20 +/- 4 19 +/- 4 16 +/- 4 23 +/- 4 18 +/- 4 12/10/21 - 12/16/21 17 +/- 5 19 +/- 5 18 +/- 5 17 +/- 5 21 +/- 5 16 +/- 5 17 +/- 5 12/16/21 - 12/22/21 16 +/- 5 22 +/- 5 20 +/- 5 20 +/- 5 22 +/- 5 23 +/- 5 19 +/- 5 12/22/21 - 12/29/21 27 +/- 5 31 +/- 5 32 +/- 5 34 +/- 5 31 +/- 5 25 +/- 5 35 +/- 6 MEAN +/- 2 STD DEV 16 +/- 10 16 +/- 10 16 +/- 10 16 +/- 10 16 +/- 10 16 +/- 9 17 +/- 10 THE MEAN AND TWO STANDARD DEVIATION ARE CALCULATED USING THE POSITIVE VALUES GROUP II GROUP I CONCENTRATIONS OF GROSS BETA IN AIR PARTICULATE SAMPLES COLLECTED IN THE VICINITY OF THREE MILE ISLAND NUCLEAR STATION, 2021 RESULTS IN UNITS OF E-3 PCI/CU METER +/- 2 SIGMA C-10

Table C-VI.2 COLLECTION MEAN COLLECTION MEAN COLLECTION MEAN PERIOD MIN MAX

+/- 2SD PERIOD MIN MAX

+/- 2SD PERIOD MIN MAX

+/- 2SD 12/29/20 - 02/04/21 7

20 12 +/- 9 12/29/20 - 02/04/21 7

18 13 +/- 8 12/29/20 - 02/04/21 10 17 13 +/- 7 02/04/21 - 03/04/21 10 22 17 +/- 9 02/04/21 - 03/04/21 8

21 17 +/- 8 02/04/21 - 03/04/21 11 20 17 +/- 8 03/04/21 - 04/01/21 13 25 16 +/- 8 03/04/21 - 04/01/21 12 20 16 +/- 5 03/04/21 - 04/01/21 12 19 16 +/- 6 04/01/21 - 04/29/21 6

23 15 +/- 14 04/01/21 - 04/29/21 6

27 16 +/- 14 04/01/21 - 04/29/21 8

23 17 +/- 15 04/29/21 - 06/03/21 7

21 13 +/- 11 04/29/21 - 06/03/21 8

21 14 +/- 9 04/29/21 - 06/03/21 9

21 14 +/- 11 06/03/21 - 07/01/21 7

18 13 +/- 8 06/03/21 - 07/01/21 7

17 12 +/- 6 06/03/21 - 07/01/21 9

15 13 +/- 5 07/01/21 - 07/29/21 10 19 16 +/- 6 07/01/21 - 07/29/21 12 23 16 +/- 7 07/01/21 - 07/29/21 13 20 16 +/- 5 07/29/21 - 09/02/21 15 21 17 +/- 4 07/29/21 - 09/02/21 13 25 18 +/- 7 07/29/21 - 09/02/21 15 25 18 +/- 8 09/02/21 - 09/30/21 15 22 18 +/- 5 09/02/21 - 09/30/21 10 26 17 +/- 8 09/02/21 - 09/30/21 15 21 17 +/- 5 09/30/21 - 11/04/21 10 23 15 +/- 9 09/30/21 - 11/04/21 11 23 16 +/- 7 09/30/21 - 11/04/21 13 23 18 +/- 9 11/04/21 - 12/02/21 10 26 18 +/- 11 11/04/21 - 12/02/21 9

28 17 +/- 10 11/04/21 - 12/02/21 14 26 19 +/- 10 12/02/21 - 12/29/21 16 31 21 +/- 11 12/02/21 - 12/29/21 16 34 22 +/- 11 12/02/21 - 12/29/21 17 35 22 +/- 17 12/29/20 - 12/29/21 6

31 16 +/- 10 12/29/20 - 12/29/21 6

34 16 +/- 10 12/29/20 - 12/29/21 8

35 17 +/- 10 MONTHLY AND YEARLY MEAN VALUES OF GROSS BETA CONCENTRATIONS IN AIR PARTICULATE SAMPLES COLLECTED IN THE VICINITY OF THREE MILE ISLAND NUCLEAR STATION, 2021 RESULTS IN UNITS OF E-3 PCI/CU METER +/- 2 SIGMA GROUP I - CLOSEST TO THE SITE BOUNDARY GROUP II - INTERMEDIATE OFFSITE GROUP III - CONTROL LOCATIONS C-11

Table C-VI.3 COLLECTION SITE PERIOD Co-58 Co-60 Nb-95 Zr-95 Cs-134 Cs-137 A3-1 12/29/20 - 04/01/21 59 +/- 18

< 3

< 4

< 4

< 3

< 5

< 3

< 3 04/01/21 - 07/01/21 81 +/- 21

< 2

< 1

< 1

< 1

< 3

< 2

< 2 07/01/21 - 09/30/21 83 +/- 22

< 3

< 2

< 2

< 2

< 4

< 2

< 2 09/30/21 - 12/29/21 53 +/- 24

< 2

< 2

< 3

< 2

< 3

< 2

< 2 MEAN +/- 2 STD DEV 69 +/- 30 E1-2 12/29/20 - 04/01/21 80 +/- 18

< 2

< 2

< 2

< 2

< 4

< 2

< 2 04/01/21 - 07/01/21 86 +/- 18

< 2

< 2

< 2

< 2

< 3

< 2

< 1 07/01/21 - 09/30/21 82 +/- 20

< 2

< 1

< 2

< 2

< 3

< 2

< 2 09/30/21 - 12/29/21 73 +/- 18

< 2

< 2

< 2

< 2

< 5

< 2

< 2 MEAN +/- 2 STD DEV 80 +/- 11 F1-3 12/29/20 - 04/01/21 69 +/- 22

< 3

< 4

< 4

< 3

< 6

< 4

< 3 04/01/21 - 07/01/21 80 +/- 24

< 3

< 3

< 3

< 3

< 7

< 4

< 3 07/01/21 - 09/30/21 72 +/- 20

< 3

< 3

< 2

< 2

< 6

< 4

< 3 09/30/21 - 12/29/21 64 +/- 17

< 2

< 3

< 2

< 2

< 4

< 2

< 1 MEAN +/- 2 STD DEV 71 +/- 13 G2-1 12/29/20 - 04/01/21 93 +/- 21

< 1

< 3

< 3

< 1

< 4

< 3

< 2 04/01/21 - 07/01/21 83 +/- 23

< 3

< 3

< 3

< 3

< 5

< 2

< 3 07/01/21 - 09/30/21 63 +/- 19

< 2

< 2

< 2

< 2

< 3

< 2

< 1 09/30/21 - 12/29/21 61 +/- 16

< 2

< 2

< 2

< 2

< 3

< 2

< 2 MEAN +/- 2 STD DEV 75 +/- 31 H3-1 12/29/20 - 04/01/21 78 +/- 18

< 2

< 2

< 3

< 3

< 4

< 3

< 2 04/01/21 - 07/01/21 68 +/- 16

< 2

< 2

< 2

< 2

< 4

< 2

< 2 07/01/21 - 09/30/21 62 +/- 18

< 4

< 4

< 3

< 3

< 5

< 3

< 3 09/30/21 - 12/29/21 55 +/- 19

< 2

< 1

< 2

< 2

< 4

< 2

< 2 MEAN +/- 2 STD DEV 66 +/- 19 M2-1 12/29/20 - 04/01/21 68 +/- 17

< 2

< 2

< 2

< 2

< 3

< 2

< 2 04/01/21 - 07/01/21 82 +/- 17

< 2

< 2

< 2

< 2

< 4

< 3

< 3 07/01/21 - 09/30/21 77 +/- 14

< 2

< 2

< 2

< 2

< 3

< 2

< 2 09/30/21 - 12/29/21 82 +/- 18

< 3

< 4

< 4

< 3

< 7

< 3

< 3 MEAN +/- 2 STD DEV 77 +/- 13 Q15-1 12/29/20 - 04/01/21 88 +/- 26

< 4

< 3

< 3

< 3

< 4

< 3

< 4 04/01/21 - 07/01/21 89 +/- 21

< 2

< 2

< 2

< 2

< 3

< 2

< 2 07/01/21 - 09/30/21 81 +/- 22

< 3

< 3

< 4

< 3

< 4

< 3

< 3 09/30/21 - 12/29/21 67 +/- 18

< 2

< 2

< 2

< 2

< 3

< 2

< 2 MEAN +/- 2 STD DEV 81 +/- 20 THE MEAN AND TWO STANDARD DEVIATION ARE CALCULATED USING THE POSITIVE VALUES RESULTS IN UNITS OF E-3 PCI/CU METER +/- 2 SIGMA Mn-54 Be-7 COLLECTED IN THE VICINITY OF THREE MILE ISLAND NUCLEAR STATION, 2021 CONCENTRATIONS OF GAMMA EMITTERS IN AIR PARTICULATE SAMPLES C-12

Table C-VII.1 COLLECTION PERIOD E1-2 F1-3 A3-1 G2-1 H3-1 12/29/20 - 01/06/21

< 15

< 14

< 42

< 46

< 46

< 46

< 20 01/06/21 - 01/14/21

< 14

< 31

< 24

< 31

< 31

< 31

< 26 01/14/21 - 01/21/21

< 20

< 47

< 23

< 47

< 47

< 47

< 25 01/21/21 - 01/28/21

< 21

< 22

< 12

< 25

< 25

< 25

< 25 01/28/21 - 02/04/21

< 22

< 53

< 20

< 53

< 52

< 53

< 22 02/04/21 - 02/11/21

< 35

< 35

< 24

< 32

< 32

< 32

< 32 02/11/21 - 02/19/21

< 37

< 36

< 17

< 44

< 44

< 45

< 45 02/19/21 - 02/25/21

< 59

< 58

< 46

< 49

< 49

< 50

< 21 02/25/21 - 03/04/21

< 30

< 29

< 14

< 29

< 29

< 29

< 29 03/04/21 - 03/11/21

< 29

< 29

< 13

< 32

< 31

< 32

< 32 03/11/21 - 03/18/21

< 42

< 41

< 25

< 33

< 32

< 32

< 33 03/18/21 - 03/25/21

< 37

< 36

< 31

< 34

< 34

< 34

< 16 03/25/21 - 04/01/21

< 29

< 17

< 17

< 45

< 44

< 45

< 45 04/01/21 - 04/08/21

< 15

< 33

< 51

< 33

< 33

< 33

< 56 04/08/21 - 04/14/21

< 10

< 9

< 20

< 42

< 42

< 43

< 43 04/14/21 - 04/21/21

< 12

< 12

< 11

< 26

< 26

< 26

< 26 04/21/21 - 04/29/21

< 17

< 40

< 20

< 40

< 40

< 40

< 10 04/29/21 - 05/06/21

< 45

< 47

< 35

< 37

< 38

< 38

< 16 05/06/21 - 05/14/21

< 23

< 11

< 19

< 23

< 23

< 23

< 19 05/14/21 - 05/19/21

< 18

< 37

< 18

< 30

< 30

< 30

< 31 05/19/21 - 05/27/21

< 33

< 32

< 18

< 32

< 22

< 33

< 29 05/27/21 - 06/03/21

< 61

< 25

< 46

< 60

< 61

< 61

< 46 06/03/21 - 06/10/21

< 36

< 15

< 43

< 35

< 36

< 36

< 43 06/10/21 - 06/17/21

< 14

< 27

< 26

< 30

< 31

< 31

< 31 06/17/21 - 06/24/21

< 32

< 13

< 17

< 16

< 16

< 17

< 10 06/24/21 - 07/01/21

< 35

< 34

< 38

< 37

< 16

< 38

< 38 07/01/21 - 07/08/21

< 54

< 52

< 23

< 53

< 53

< 54

< 55 07/08/21 - 07/14/21

< 15

< 36

< 24

< 27

< 27

< 28

< 28 07/14/21 - 07/22/21

< 19

< 43

< 36

< 44

< 44

< 45

< 35 07/22/21 - 07/29/21

< 44

< 18

< 36

< 43

< 44

< 44

< 35 07/29/21 - 08/05/21

< 33

< 17

< 50

< 33

< 33

< 33

< 50 08/05/21 - 08/11/21

< 34

< 28

< 35

< 33

< 33

< 34

< 35 08/11/21 - 08/18/21

< 46

< 19

< 35

< 46

< 46

< 46

< 35 08/18/21 - 08/26/21

< 28

< 28

< 38

< 23

< 28

< 29

< 38 08/26/21 - 09/02/21

< 27

< 25

< 27

< 12

< 26

< 27

< 27 09/02/21 - 09/10/21

< 17

< 14

< 11

< 27

< 27

< 27

< 27 09/10/21 - 09/17/21

< 28

< 28

< 16

< 38

< 38

< 36

< 37 09/17/21 - 09/23/21

< 23

< 48

< 46

< 43

< 43

< 47

< 23 09/23/21 - 09/30/21

< 43

< 42

< 19

< 43

< 43

< 44

< 44 09/30/21 - 10/07/21

< 22

< 22

< 29

< 42

< 42

< 43

< 43 10/07/21 - 10/13/21

< 38

< 37

< 17

< 39

< 39

< 40

< 40 10/13/21 - 10/21/21

< 28

< 27

< 10

< 9

< 10

< 10

< 10 10/21/21 - 10/28/21

< 32

< 13

< 42

< 31

< 31

< 32

< 42 10/28/21 - 11/04/21

< 17

< 20

< 17

< 20

< 20

< 20

< 16 11/04/21 - 11/12/21

< 21

< 13

< 28

< 20

< 20

< 21

< 28 11/12/21 - 11/18/21

< 16

< 33

< 41

< 33

< 33

< 32

< 40 11/18/21 - 11/24/21

< 47

< 39

< 66

< 46

< 46

< 49

< 67 11/24/21 - 12/02/21

< 33

< 33

< 17

< 24

< 24

< 24

< 25 12/02/21 - 12/10/21

< 24

< 11

< 24

< 23

< 24

< 24

< 16 12/10/21 - 12/16/21

< 22

< 51

< 39

< 52

< 52

< 53

< 38 12/16/21 - 12/22/21

< 35

< 34

< 18

< 35

< 35

< 36

< 36 12/22/21 - 12/29/21

< 63

< 26

< 43

< 62

< 62

< 63

< 43 MEAN CONCENTRATIONS OF I-131 IN AIR IODINE SAMPLES COLLECTED IN THE VICINITY OF THREE MILE ISLAND NUCLEAR STATION, 2021 RESULTS IN UNITS OF E-3 PCI/CU METER +/- 2 SIGMA GROUP I Q15-1 M2-1 GROUP II GROUP III C-13

TABLE C-VIII.1 COLLECTION PERIOD K15-3 G2-1 P4-1 01/13/21

< 0.9 (1)

< 0.9

< 0.9

< 0.9 02/10/21 (1)

(1)

< 0.9

< 0.9

< 0.9 03/10/21 (1)

< 0.8

< 0.9

< 0.9

< 0.9 03/24/21 (1)

< 0.9 (1)

(1)

< 0.8 04/07/21 (1)

< 0.8

< 0.8

< 0.9

< 0.5 04/21/21 (1)

< 0.9

< 0.9

< 0.9

< 0.9 05/05/21 (1)

< 0.9

< 0.8

< 0.7

< 0.8 05/19/21 (1)

< 0.9

< 0.9

< 0.9

< 0.8 06/02/21 (1)

< 0.6

< 0.9

< 0.9

< 0.9 06/16/21 (1)

< 0.6

< 0.4

< 0.5

< 0.6 06/30/21 (1)

< 0.7

< 0.8

< 0.5

< 0.6 07/14/21 (1)

< 0.8

< 0.7

< 0.7

< 0.8 07/28/21 (1)

< 0.9

< 0.9

< 0.9

< 0.8 08/11/21 (1)

< 0.8

< 0.6

< 0.8

< 0.7 08/25/21 (1)

< 0.8

< 1.0

< 0.8

< 1.0 09/09/21 (1)

< 0.7

< 0.9

< 0.9

< 0.8 09/24/21 (1)

< 0.7

< 0.7

< 0.8

< 0.7 10/06/21 (1)

< 1.0

< 0.8

< 0.9

< 0.8 10/20/21 (1)

< 0.9

< 0.9

< 0.8

< 0.8 11/04/21 (1)

< 0.9

< 0.7

< 0.9

< 0.6 11/18/21 (1)

< 0.7

< 0.9

< 0.8

< 0.9 12/22/21 (1)

< 0.7

< 0.9

< 0.8

< 0.9 MEAN (1) SEE PROGRAM EXCEPTIONS SECTION FOR INFORMATION CONCENTRATIONS OF I-131 IN MILK SAMPLES COLLECTED IN THE VICINITY OF THREE MILE ISLAND NUCLEAR STATION, 2021 CONTROL FARMS F4-1 INDICATOR FARMS RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA J18-1 C-14

Table C-VIII.2 INDICATOR FARMS COLLECTION G2-1 P4-1 PERIOD Sr-89 Sr-90 Sr-89 Sr-90 Sr-89 Sr-90 Sr-89 Sr-90 Sr-89 Sr-90 01/13/21 - 03/10/21

< 4.6

< 0.9 (1)

(1)

< 4.4

< 0.9

< 4.2

< 0.9

< 4.3

< 0.8 03/10/21 - 03/24/21 (1)

(1)

< 4.0

< 0.8 03/24/21 - 06/30/21 (1)

(1)

< 4.5

< 0.9 (1)

(1)

(1)

(1)

< 4.4

< 0.9 04/07/21 - 06/30/21 (1)

(1)

< 4.5

< 1.0

< 4.3

< 0.9 07/14/21 - 09/23/21 (1)

(1)

< 4.4

< 0.8

< 4.6

< 0.9

< 4.7

< 1.0

< 3.9

< 0.8 10/06/21 - 12/22/21 (1)

(1)

< 4.1

< 0.8

< 4.0

< 0.9

< 4.1

< 0.9

< 4.7

< 0.8 MEAN (1) SEE PROGRAM EXCEPTIONS SECTION FOR INFORMATION CONCENTRATIONS OF STRONTIUM IN MILK SAMPLES COLLECTED IN THE VICINITY OF THREE MILE ISLAND NUCLEAR STATION, 2021 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA K15-3 F4-1 J18-1 CONTROL FARMS C-15

Table C-VIII.3 COLLECTION SITE PERIOD K-40 F4-1 01/13/21 1350 +/- 176

< 6

< 7

< 36

< 13 02/10/21 1267 +/- 142

< 6

< 5

< 34

< 10 03/10/21 1273 +/- 200

< 9

< 7

< 27

< 11 03/24/21 (1) 04/07/21 1105 +/- 146

< 8

< 6

< 24

< 9 04/21/21 1313 +/- 188

< 10

< 8

< 27

< 15 05/05/21 1363 +/- 172

< 8

< 7

< 27

< 8 05/19/21 1307 +/- 193

< 10

< 8

< 29

< 9 06/02/21 1221 +/- 187

< 9

< 9

< 35

< 8 06/16/21 1361 +/- 168

< 8

< 7

< 26

< 10 06/30/21 1250 +/- 186

< 8

< 8

< 24

< 10 07/14/21 1315 +/- 176

< 7

< 7

< 23

< 9 07/28/21 1472 +/- 158

< 7

< 7

< 34

< 8 08/11/21 1154 +/- 168

< 9

< 8

< 32

< 7 08/25/21 1311 +/- 203

< 10

< 8

< 32

< 14 09/09/21 1363 +/- 163

< 8

< 7

< 31

< 12 09/23/21 1315 +/- 147

< 8

< 6

< 35

< 9 10/06/21 1433 +/- 126

< 6

< 6

< 19

< 7 10/20/21 1336 +/- 190

< 5

< 8

< 25

< 9 11/04/21 1392 +/- 197

< 9

< 8

< 32

< 7 11/18/21 1350 +/- 194

< 8

< 8

< 29

< 11 12/22/21 1266 +/- 204

< 9

< 8

< 32

< 11 MEAN +/- 2 STD DEV 1310 +/- 169 G2-1 01/13/21 1552 +/- 171

< 8

< 9

< 40

< 13 02/09/21 1330 +/- 133

< 6

< 7

< 37

< 11 03/10/21 1050 +/- 150

< 8

< 7

< 29

< 10 03/24/21 (1) 04/07/21 1360 +/- 128

< 7

< 6

< 21

< 6 04/21/21 1064 +/- 183

< 13

< 10

< 45

< 12 05/05/21 1556 +/- 144

< 7

< 7

< 25

< 8 05/19/21 1529 +/- 190

< 9

< 9

< 28

< 8 06/02/21 1264 +/- 161

< 9

< 9

< 36

< 10 06/16/21 1241 +/- 180

< 10

< 7

< 31

< 7 06/30/21 780 +/- 150

< 12

< 10

< 37

< 14 07/14/21 939 +/- 159

< 9

< 7

< 28

< 12 07/28/21 1084 +/- 180

< 8

< 8

< 36

< 7 08/11/21 1209 +/- 160

< 8

< 9

< 32

< 11 08/25/21 1019 +/- 174

< 8

< 8

< 30

< 11 09/09/21 1169 +/- 176

< 10

< 7

< 33

< 9 09/23/21 1210 +/- 129

< 6

< 6

< 30

< 5 10/06/21 1381 +/- 168

< 8

< 7

< 21

< 7 10/20/21 1207 +/- 172

< 10

< 7

< 26

< 9 11/04/21 1211 +/- 140

< 7

< 8

< 25

< 7 11/18/21 1248 +/- 156

< 7

< 8

< 27

< 11 12/22/21 1306 +/- 191

< 9

< 7

< 39

< 11 MEAN +/- 2 STD DEV 1224 +/- 394 THE MEAN AND TWO STANDARD DEVIATION ARE CALCULATED USING THE POSITIVE VALUES (1) SEE PROGRAM EXCEPTIONS SECTION FOR INFORMATION CONCENTRATIONS OF GAMMA EMITTERS IN MILK SAMPLES COLLECTED IN THE VICINITY OF THREE MILE ISLAND NUCLEAR STATION, 2021 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA La-140 Ba-140 Cs-137 Cs-134 C-16

Table C-VIII.3 COLLECTION SITE PERIOD K-40 CONCENTRATIONS OF GAMMA EMITTERS IN MILK SAMPLES COLLECTED IN THE VICINITY OF THREE MILE ISLAND NUCLEAR STATION, 2021 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA La-140 Ba-140 Cs-137 Cs-134 K15-3 01/13/21 (1) 631 +/- 135

< 7

< 6

< 27

< 8 MEAN +/- 2 STD DEV 631 +/- 0 J18-1 03/10/21 1122 +/- 141

< 5

< 6

< 22

< 6 03/24/21 1127 +/- 161

< 8

< 8

< 31

< 12 04/07/21 1296 +/- 161

< 7

< 6

< 20

< 7 04/21/21 1310 +/- 169

< 8

< 7

< 30

< 9 05/05/21 1240 +/- 150

< 6

< 7

< 24

< 6 05/19/21 1456 +/- 188

< 8

< 7

< 27

< 6 06/02/21 1260 +/- 156

< 8

< 8

< 36

< 9 06/16/21 1252 +/- 177

< 9

< 9

< 26

< 9 06/30/21 1136 +/- 189

< 9

< 10

< 29

< 12 07/14/21 1391 +/- 177

< 9

< 7

< 22

< 7 07/28/21 1257 +/- 121

< 5

< 4

< 21

< 6 08/11/21 1373 +/- 198

< 9

< 8

< 30

< 9 08/25/21 1307 +/- 183

< 12

< 9

< 44

< 13 09/09/21 1181 +/- 168

< 10

< 9

< 40

< 10 09/24/21 1123 +/- 132

< 7

< 7

< 26

< 6 10/06/21 1243 +/- 193

< 12

< 9

< 36

< 7 10/20/21 1143 +/- 146

< 7

< 7

< 21

< 9 11/04/21 1058 +/- 165

< 8

< 8

< 26

< 6 11/18/21 1363 +/- 145

< 7

< 6

< 29

< 9 12/22/21 1160 +/- 170

< 7

< 9

< 40

< 13 MEAN +/- 2 STD DEV 1240 +/- 215 P4-1 01/13/21 1426 +/- 162

< 8

< 7

< 32

< 10 02/10/21 1312 +/- 146

< 8

< 7

< 46

< 13 03/10/21 1173 +/- 217

< 8

< 9

< 38

< 9 03/24/21 1269 +/- 182

< 9

< 8

< 38

< 6 04/07/21 1579 +/- 149

< 7

< 7

< 23

< 5 04/21/21 1480 +/- 199

< 9

< 8

< 29

< 10 05/05/21 1341 +/- 174

< 8

< 7

< 29

< 12 05/19/21 1331 +/- 173

< 9

< 8

< 36

< 7 06/02/21 1388 +/- 196

< 8

< 6

< 34

< 9 06/16/21 1227 +/- 171

< 8

< 8

< 25

< 7 06/30/21 1415 +/- 177

< 9

< 7

< 27

< 11 07/14/21 1288 +/- 170

< 9

< 8

< 26

< 8 07/28/21 1527 +/- 204

< 8

< 9

< 33

< 8 08/11/21 1525 +/- 194

< 9

< 7

< 36

< 13 08/25/21 1419 +/- 169

< 7

< 8

< 31

< 10 09/09/21 1442 +/- 212

< 9

< 10

< 37

< 9 09/23/21 1421 +/- 145

< 6

< 6

< 27

< 10 10/06/21 1373 +/- 148

< 6

< 7

< 19

< 6 10/20/21 1329 +/- 169

< 7

< 8

< 27

< 9 11/04/21 1184 +/- 186

< 8

< 9

< 42

< 14 11/18/21 1294 +/- 181

< 9

< 7

< 27

< 10 12/22/21 1271 +/- 165

< 7

< 9

< 36

< 7 MEAN +/- 2 STD DEV 1364 +/- 220 THE MEAN AND TWO STANDARD DEVIATION ARE CALCULATED USING THE POSITIVE VALUES (1) SEE PROGRAM EXCEPTIONS SECTION FOR INFORMATION C-17

Table C-IX.1 CONCENTRATIONS OF STRONTIUM AND GAMMA EMITTERS IN FOOD COLLECTION SITE PERIOD

-131 Cs-134 Cs-137 B10-2 Kale Leaves 06/30/21

< 182 4369 +/- 614

< 31

< 31

< 26 Cabbage Leaves 06/30/21

< 257 3463 +/- 481

< 26

< 25

< 28 Broccoli Leaves 06/30/21

< 245 2892 +/- 535

< 23

< 24

< 25 Kale Leaves 07/28/21

< 293 5488 +/- 710

< 29

< 36

< 36 Cabbage Leaves 07/28/21

< 250 2863 +/- 532

< 28

< 27

< 29 Cauliflower Leaves 07/28/21 357 +/- 157 2301 +/- 443

< 22

< 22

< 17 Corn 08/25/21

< 3.9

< 168 1843 +/- 398

< 21

< 20

< 22 Tomato 08/25/21

< 4.2

< 197 1234 +/- 407

< 20

< 17

< 24 Broccoli Leaves 08/25/21

< 213 2283 +/- 469

< 28

< 28

< 25 Cauliflower Leaves 08/25/21

< 241 2705 +/- 606

< 30

< 33

< 29 Cabbage Leaves 08/25/21

< 240 4176 +/- 673

< 28

< 27

< 30 Potato 09/30/21

< 4.7

< 226 3713 +/- 612

< 41

< 30

< 27 Broccoli Leaves 09/30/21 499 +/- 217 3080 +/- 586

< 37

< 32

< 33 Cauliflower Leaves 09/30/21 473 +/- 253 3131 +/- 561

< 43

< 36

< 32 Kale Leaves 09/30/21 649 +/- 289 4066 +/- 594

< 35

< 27

< 26 MEAN +/- 2 STD DEV 494 +/- 240 3022 +/- 2268 E1-2 Swiss Chard Leaves 06/30/21 709 +/- 291 4041 +/- 720

< 24

< 39

< 30 Broccoli Leaves 06/30/21

< 294 3912 +/- 654

< 32

< 30

< 28 Kale Leaves 06/30/21

< 212 5865 +/- 629

< 25

< 28

< 25 Cabbage Leaves 07/28/21 501 +/- 216 3857 +/- 630

< 27

< 24

< 33 Broccoli Leaves 07/28/21 1230 +/- 316 2342 +/- 515

< 26

< 32

< 21 Kale Leaves 07/28/21 725 +/- 223 3680 +/- 605

< 27

< 28

< 29 Corn 08/25/21

< 3.8

< 127 2245 +/- 387

< 21

< 18

< 22 Tomato 08/25/21

< 4.4

< 130 2209 +/- 363

< 17

< 22

< 17 Kale Leaves 08/25/21 965 +/- 282 4214 +/- 656

< 27

< 34

< 31 Cabbage Leaves 08/25/21 1582 +/- 251 3561 +/- 502

< 20

< 18

< 20 Swiss Chard Leaves 08/25/21 955 +/- 319 4936 +/- 653

< 31

< 33

< 33 Potato 09/30/21

< 4.3

< 221 3564 +/- 602

< 43

< 31

< 29 Kale Leaves 09/30/21 825 +/- 229 4085 +/- 632

< 38

< 32

< 28 Cabbage Leaves 09/30/21 1983 +/- 449 5005 +/- 823

< 56

< 36

< 29 Swiss Chard Leaves 09/30/21 1104 +/- 315 4063 +/- 745

< 45

< 37

< 39 MEAN +/- 2 STD DEV 1058 +/- 889 3644 +/- 2124 H1-2 Cucumber Leaves 06/30/21 731 +/- 187 4055 +/- 549

< 23

< 27

< 19 Yellow Squash Leaves 06/30/21 714 +/- 242 4068 +/- 631

< 29

< 26

< 25 Zucchini Leaves 06/30/21 889 +/- 318 3358 +/- 592

< 31

< 29

< 32 Cucumber Leaves 07/28/21 1051 +/- 238 3495 +/- 461

< 23

< 27

< 20 Yellow Squash Leaves 07/28/21 1409 +/- 310 2899 +/- 683

< 25

< 37

< 23 Zucchini Leaves 07/28/21 618 +/- 198 3313 +/- 556

< 21

< 25

< 27 Zucchini Leaves 08/25/21 597 +/- 256 3434 +/- 611

< 30

< 31

< 28 Yellow Squash Leaves 08/25/21 1008 +/- 285 3729 +/- 549

< 28

< 29

< 31 Watermelon Leaves 08/25/21 2272 +/- 317 4069 +/- 532

< 24

< 26

< 24 Zucchini Leaves 09/30/21 1014 +/- 318 1603 +/- 486

< 36

< 34

< 31 Yellow Squash Leaves 09/30/21 819 +/- 304 3416 +/- 699

< 42

< 34

< 38 Cucumber Leaves 09/30/21 1107 +/- 308 3460 +/- 630

< 38

< 31

< 31 MEAN +/- 2 STD DEV 1019 +/- 915 3408 +/- 1339 PRODUCT SAMPLES COLLECTED IN THE VICINITY OF RESULTS IN UNITS OF PCI/KG WET +/- 2 SIGMA THREE MILE ISLAND NUCLEAR STATION, 2021 THE MEAN AND TWO STANDARD DEVIATION ARE CALCULATED USING THE POSITIVE VALUES K-40 Be-7 Sr-90 C-18

Table C-X.1 QUARTERLY OSLD RESULTS FOR THREE MILE ISLAND NUCLEAR STATION, 2021 STATION MEAN CODE

+/- 2 S.D.

JAN - MAR APR - JUN JUL - SEP OCT - DEC A1-4 15.1 +/- 2.7 13.6 14.8 15.0 16.9 A3-1 13.8 +/- 3.6 12.4 12.1 14.9 15.7 A5-1 17.9 +/- 3.1 16.1 17.3 18.5 19.7 A9-3 15.1 +/- 3.1 13.3 14.4 15.7 16.9 B1-1 15.9 +/- 3.9 13.0 16.2 17.2 17.1 B1-2 15.7 +/- 3.2 13.5 16.3 15.8 17.2 B2-1 15.1 +/- 4.9 13.5 12.8 15.7 18.2 B5-1 17.7 +/- 4.7 15.0 16.5 19.8 19.6 C1-1 16.7 +/- 4.7 15.0 14.6 17.3 19.7 C1-2 15.5 +/- 3.3 13.2 16.0 15.8 17.1 C2-1 16.7 +/- 4.9 14.8 14.3 18.9 18.6 C5-1 17.9 +/- 4.7 16.2 15.6 19.1 20.6 C8-1 18.1 +/- 3.8 17.0 16.1 18.7 20.4 D1-1 16.4 +/- 5.1 12.8 16.6 17.2 18.9 D1-2 15.9 +/- 1.5 15.6 15.0 16.2 16.8 D2-2 20.5 +/- 3.6 18.1 20.3 22.5 20.9 D6-1 19.6 +/- 3.3 19.1 17.6 20.3 21.5 E1-2 15.6 +/- 2.3 15.1 14.2 16.2 16.8 E1-4 17.6 +/- 6.5 14.2 17.2 17.0 22.0 E2-3 17.9 +/- 5.1 15.3 16.5 18.5 21.1 E5-1 19.3 +/- 3.0 18.1 17.8 20.3 20.8 E7-1 17.2 +/- 3.4 15.6 15.9 18.2 19.0 F1-1 16.8 +/- 3.0 15.2 16.0 17.5 18.6 F1-2 17.0 +/- 3.2 14.7 18.2 17.1 17.9 F1-4 15.6 +/- 2.5 14.2 15.5 15.5 17.2 F2-1 18.3 +/- 5.5 15.1 17.0 21.2 19.9 F5-1 20.0 +/- 4.2 17.5 19.7 20.0 22.6 G1-2 17.2 +/- 4.5 14.8 16.1 18.1 19.9 G1-3 14.4 +/- 2.6 12.7 14.1 14.8 15.8 G1-5 14.3 +/- 3.0 12.2 15.3 14.2 15.5 G1-6 15.5 +/- 2.2 14.0 15.3 16.4 16.2 G2-4 21.4 +/- 3.4 20.1 19.7 22.4 23.2 G5-1 16.6 +/- 4.4 14.9 15.2 16.6 19.7 H1-1 17.0 +/- 3.9 14.7 17.3 16.4 19.4 H1-3*

16.5 +/- 0.0 16.5 H3-1 13.2 +/- 1.9 13.0 11.9 14.1 13.7 H5-1 13.5 +/- 2.2 12.0 13.4 14.5 14.2 H8-1 27.9 +/- 7.0 23.2 31.3 27.7 29.5 J1-1 15.8 +/- 2.4 14.2 16.3 15.7 17.0 J1-3 13.5 +/- 4.3 10.5 13.7 14.3 15.5 J1-4*

14.8 +/- 0.0 14.8 J3-1 16.8 +/- 2.3 15.0 17.4 17.4 17.2 J5-1 19.0 +/- 3.4 16.6 19.1 20.4 20.0 J7-1 21.2 +/- 4.9 18.2 20.2 23.5 22.9 K1-4 15.8 +/- 2.7 14.4 15.0 16.6 17.3 K1-5*

15.5 +/- 0.0 15.5 K2-1 19.9 +/- 2.3 18.4 19.9 20.1 21.2

• New Station added 4Q21 RESULTS IN UNITS OF MILLIREM/QUARTER - MISSING C-19

Table C-X.1 QUARTERLY OSLD RESULTS FOR THREE MILE ISLAND NUCLEAR STATION, 2021 STATION MEAN CODE

+/- 2 S.D.

JAN - MAR APR - JUN JUL - SEP OCT - DEC RESULTS IN UNITS OF MILLIREM/QUARTER - MISSING K3-1 15.4 +/- 1.1 15.0 15.0 16.2 15.3 K5-1 19.2 +/- 3.9 16.8 18.9 19.5 21.6 K8-1 17.7 +/- 2.6 16.1 18.4 17.3 19.0 L1-1 17.9 +/- 4.5 15.0 20.5 17.9 18.3 L1-2 14.1 +/- 2.7 12.1 14.5 14.6 15.1 L2-1 16.8 +/- 2.5 15.0 16.8 17.5 17.7 L5-1 15.2 +/- 2.3 14.2 14.2 16.4 15.9 L8-1 17.5 +/- 2.6 15.7 18.2 17.3 18.6 M1-1 15.4 +/- 3.1 14.2 14.2 15.6 17.5 M1-2 17.0 +/- 3.7 14.2 17.7 17.6 18.3 M2-1 14.7 +/- 3.6 13.7 12.9 15.3 17.0 M5-1 16.7 +/- 2.1 15.3 17.3 16.5 17.6 M9-1 21.4 +/- 4.2 19.6 24.0 19.8 22.1 N1-1 16.4 +/- 4.7 13.7 17.1 15.6 19.2 N1-3 18.5 +/- 2.2 16.9 19.3 19.2 18.6 N2-1 17.3 +/- 1.4 16.5 16.9 18.1 17.6 N5-1 15.3 +/- 4.7 13.3 18.6 14.1 15.0 N8-1 18.5 +/- 2.7 16.7 18.4 19.3 19.7 P1-1 15.8 +/- 4.0 13.4 15.3 16.5 18.1 P1-2 23.1 +/- 2.9 21.4 24.2 22.4 24.4 P2-1 21.1 +/- 3.9 19.2 23.2 19.7 22.3 P5-1 16.7 +/- 1.7 15.8 16.4 16.7 17.8 P8-1 14.2 +/- 2.1 13.2 14.3 13.7 15.6 Q1-1 16.6 +/- 3.6 14.0 16.9 17.6 17.9 Q1-2 15.9 +/- 2.4 14.6 15.5 15.8 17.5 Q2-1 14.6 +/- 1.7 13.7 14.7 14.2 15.7 Q5-1 15.4 +/- 2.8 13.7 15.7 15.2 17.1 Q9-1 16.4 +/- 3.4 14.9 18.7 15.4 16.7 R1-1 16.5 +/- 3.6 15.2 14.7 17.8 18.2 R1-2 14.7 +/- 3.7 12.2 14.3 15.9 16.3 R3-1 19.0 +/- 2.7 17.1 19.1 19.5 20.3 R5-1 18.8 +/- 2.9 16.7 19.8 19.4 19.4 R9-1 18.0 +/- 3.0 16.9 17.4 17.4 20.2 B10-1 16.6 +/- 3.5 14.9 15.3 18.0 18.2 D15-1 16.9 +/- 5.6 14.4 14.6 19.6 19.0 F10-1 21.1 +/- 4.1 18.4 21.0 21.5 23.4 F25-1 18.2 +/- 4.4 16.2 16.9 18.6 21.2 G10-1 25.6 +/- 6.4 20.8 26.7 27.4 27.3 G15-1 20.2 +/- 2.0 19.3 20.9 21.3 19.4 H15-1 17.9 +/- 2.4 16.1 18.4 18.4 18.7 J15-1 20.8 +/- 2.5 20.0 19.5 21.9 21.9 K15-1 16.2 +/- 2.9 14.6 15.3 17.7 17.1 L15-1 17.8 +/- 3.5 15.7 17.6 17.9 20.0 N15-2 19.2 +/- 1.7 18.3 18.9 19.4 20.3 Q15-1 18.6 +/- 3.8 16.0 19.6 18.4 20.4 R15-1 16.5 +/- 2.4 15.8 15.5 16.5 18.2 C-20

TABLE C-X.2 COLLECTION SITE BOUNDARY PERIOD

+/- 2 STD DEV INDICATOR CONTROL JAN-MAR 14.3 +/- 4.3 15.6 +/- 4.4 17.0 +/- 4.4 APR-JUN 16.5 +/- 5.2 17.0 +/- 6.2 18.5 +/- 6.7 JUL-SEP 16.6 +/- 3.8 17.9 +/- 5.2 19.7 +/- 6.0 OCT-DEC 17.6 +/- 4.4 18.9 +/- 5.4 20.3 +/- 5.4 TABLE C-X.3 SAMPLES PERIOD LOCATION ANALYZED MAXIMUM SITE BOUNDARY 79 24.4 16.3 +/- 5.0 INDICATOR 240 31.3 17.3 +/- 5.8 CONTROL 44 27.4 18.9 +/- 6.0 SITE BOUNDARY STATIONS - A1-4, B1-2, C1-2, D1-1, E1-4, F1-2, F1-4, G1-3, G1-5 G1-6, H1-1, H1-3, J1-3, J1-4, K1-4, K1-5, L1-1, M1-1, N1-3, P1-2, Q1-2, R1-1 INDICATOR STATIONS - A3-1, A5-1, A9-3, B1-1, B10-1, B2-1, B5-1, C1-1, C2-1, C5-1, C8-1, D1-2, D2-2, D6-1, E1-2, E2-3, E5-1, E7-1, F1-1, F10-1, F2-1, F5-1, G1-2, G2-4, G5-1, H3-1, H5-1, H8-1, J1-1, J3-1, J5-1, J7-1, K2-1, K3-1, K5-1, K8-1, L1-2, L2-1, L5-1, L8-1, M1-2, M2-1, M5-1, M9-1, N1-1, N2-1, N5-1, N8-1, P1-1, P2-1, P5-1, Q1-1, Q2-1, Q5-1, Q9-1, R1-2, R3-1, R5-1, R9-1 CONTROL STATIONS - D15-1, F25-1, G10-1, G15-1, H15-1, J15-1, K15-1, L15-1, N15-1, Q15-1, R15-1 MEAN QUARTERLY OSLD RESULTS FOR THE FOR THREE MILE ISLAND NUCLEAR STATION, 2021 RESULTS IN UNITS OF MILLIREM/QUARTER RESULTS IN UNITS OF MILLIREMQUARTER PERIOD 10.5 11.9 14.4 SITE BOUNDARY, INDICATOR AND CONTROL LOCATIONS

+/- 2 STANDARD DEVIATIONS OF THE STATION DATA

SUMMARY

OF THE AMBIENT DOSIMETRY PROGRAM FOR THREE MILE ISLAND NUCLEAR STATION, 2021 PERIOD MEAN

+/- 2 STD DEV MINIMUM C-21

FIGURE C-1 Monthly Tritium Concentrations in Surface Water and Effluent Water Three Mile Island Nuclear Station, 2021 10 100 1000 10000 100000 1000000 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Picocuries per Liter Month Station K1-1 (TMINS Liquid Discharge) 10 100 1000 10000 100000 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Picocuries per Liter Month Station J1-2 (Downstream of Discharge)

Station Q9-1 (Control)

C-22

FIGURE C-2 Mean Quarterly Tritium Concentrations in Surface Water Three Mile Island Nuclear Station, 1974 - 2021

-1000 0

1000 2000 3000 4000 5000 6000 7000 8000 9000 10000 11000 12000 1974 1980 1986 1992 1998 2004 2010 2016 2022 Picocuries per Liter Year Indicator Samples Control Samples Significant Events TMI-1 Critical June 1974 TMI-2 Critical March 1978 TMI-2 Accident March 1979 TMI-2 RB Purge June 1980 Chernobyl April 1986 Major Atm. Nuclear Weapon Tests June 1974 September 1974 September 1976 November 1976 September 1977 March 1978 December 1978 October 1980 C-23

FIGURE C-3 Mean Monthly Gross Beta Concentrations in Drinking Water Three Mile Island Nuclear Station, 2021 0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10.0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Picocuries per Liter Month Indicator Samples Control Samples C-24

FIGURE C-4 Mean Monthly Tritium Concentrations in Drinking Water and Effluent Water Three Mile Island Nuclear Station, 2021 10 100 1000 10000 100000 1000000 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Picocuries per Liter Month Station K1-1 (TMINS Liquid Discharge) 0 100 200 300 400 500 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Picocuries per Liter Month Indicator Samples Control Samples NOTE: USEPA Drinking Water Limit for Tritium: 20,000 pCi/L The mean values are calculated using both the MDCs and the positive values.

NOTE:

C-25

FIGURE C-5 Mean Cesium-137 Concentrations in Aquatic Sediments Three Mile Island Nuclear Station, 1984 - 2021 0

100 200 300 400 500 600 700 800 900 1984 1991 1998 2006 2014 2021 Picocuries per kilogram (dry)

Year Indicator Samples Control Samples Significant Event

.Chernobyl April 1986 C-26

FIGURE C-6 Mean Quarterly Gross Beta Concentrations in Air Particulates Three Mile Island Nuclear Station, 1972 - 2021 0

0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 1972 1977 1982 1987 1992 1997 2002 2007 2012 2017 2022 Picocuries per Cubic Meter Year Indicator Control Significant Events TMI-1 Critical June 1974 TMI-2 Critical March 1978 TMI-2 Accident March 1979 TMI-2 RB Purge June 1980 Chernobyl April 1986 Major Atm. Nuclear Weapon Tests March 1972 June 1973 June 1974 September 1974 September 1976 November 1976 September 1977 March 1978 December 1978 October 1980 C-27

FIGURE C-7 Mean Weekly Gross Beta Concentrations in Air Particulates Three Mile Island Nuclear Station, 2007 - 2021 0.000 0.010 0.020 0.030 0.040 0.050 0.060 0.070 0.080 0.090 0.100 01/01/07 02/22/09 04/16/11 06/07/13 07/30/15 09/20/17 11/12/19 01/03/22 Picocuries per Cubic Meter Month / Day / Year Indicator Control The high value on 11/24/2009 was caused by an airborne release on 11/21/2009 C-28

FIGURE C-8 Mean Quarterly Strontium-90 Concentrations in Cow Milk Three Mile Island Nuclear Station, 1979 - 2021 0

1 2

3 4

5 6

7 8

9 10 1979 1986 1993 2000 2007 2014 2021 Picocuries per Liter Year Indicator Samples Control Samples Significant Events TMI-2 Accident March 1979 TMI-2 RB Purge June 1980 Chernobyl April 1986 Major Atm. Nuclear Weapon Tests December 1978 October 1980 C-29

Intentionally left blank

APPENDIX D DATA TABLES AND FIGURES COMPARISON LABORATORIES

Intentionally left blank

The following section presents the results of data analysis performed by the QC laboratories, Exelon Industrial Services (EIS) and GEL Laboratories (GEL). Duplicate samples were obtained from several locations and media and were split with the primary laboratory, Teledyne Brown Engineering (TBE). Comparison of the results for most media were within expected ranges.

Intentionally left blank

TABLE D-I.1 LAB EIS 12/29/20 - 01/28/21 2.5 +/- 0.8 01/28/21 - 02/25/21 1.7 +/- 0.8 02/25/21 - 04/01/21 1.6 +/- 0.7 04/01/21 - 04/29/21 1.4 +/- 0.7 04/29/21 - 05/27/21 2.0 +/- 0.8 05/27/21 - 07/01/21 1.9 +/- 0.8 07/01/21 - 07/29/21 1.7 +/- 0.8 07/29/21 - 09/02/21 2.6 +/- 0.8 09/02/21 - 09/30/21 1.7 +/- 0.7

`

09/30/21 - 10/28/21 1.8 +/- 0.7 10/28/21 - 12/02/21 2.1 +/- 0.8 12/02/21 - 12/29/21 1.3 +/- 0.7 MEAN +/- 2 STD DEV 1.8 +/- 0.8 TABLE D-I.2 CONCENTRATIONS OF TRITIUM IN DRINKING WATER SAMPLES COLLECTED LAB Q9-1Q GEL 12/29/20 - 04/01/21

< 112 04/01/21 - 07/01/21

< 194 07/01/21 - 09/30/21

< 130 09/30/21 - 12/29/21

< 146 MEAN TABLE D-I.3 CONCENTRATIONS OF IODINE-131 IN DRINKING WATER SAMPLES COLLECTED LAB Q9-1Q EIS 12/29/20 - 01/28/21

< 0.7 01/28/21 - 02/25/21

< 0.5 02/25/21 - 04/01/21

< 0.6 04/01/21 - 04/29/21

< 0.7 04/29/21 - 05/27/21

< 0.4 05/27/21 - 07/01/21

< 0.8 07/01/21 - 07/29/21

< 0.6 07/29/21 - 09/02/21

< 0.7 09/02/21 - 09/30/21

< 0.4 09/30/21 - 10/28/21

< 0.5 10/28/21 - 12/02/21

< 0.7 12/02/21 - 12/29/21

< 0.4 MEAN THE MEAN AND 2 STANDARD DEVIATION VALUES ARE CALCULATED USING THE POSITIVE VALUES IN THE VICINITY OF THREE MILE ISLAND NUCLEAR STATION, 2021 IN THE VICINITY OF THREE MILE ISLAND NUCLEAR STATION, 2021 CONCENTRATIONS OF GROSS BETA IN DRINKING WATER SAMPLES COLLECTED RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA IN THE VICINITY OF THREE MILE ISLAND NUCLEAR STATION, 2021 PERIOD COLLECTION COLLECTION PERIOD COLLECTION PERIOD RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA Q9-1Q D-1

TABLE D-I.4 LAB SITE Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 Cs-134 Cs-137 Ba-140 La-140 EIS Q9-1Q 12/29/20 - 01/28/21

< 4

< 5

< 8

< 4

< 10

< 4

< 8

< 4

< 4

< 17

< 6 01/28/21 - 02/25/21

< 6

< 6

< 13

< 5

< 13

< 5

< 9

< 5

< 5

< 23

< 8 02/25/21 - 04/01/21

< 5

< 5

< 11

< 5

< 12

< 7

< 11

< 5

< 6

< 26

< 10 04/01/21 - 04/29/21

< 5

< 5

< 12

< 5

< 12

< 7

< 10

< 5

< 5

< 24

< 8 04/29/21 - 05/27/21

< 5

< 6

< 12

< 5

< 10

< 6

< 9

< 5

< 6

< 22

< 8 05/27/21 - 07/01/21

< 5

< 5

< 10

< 6

< 8

< 5

< 8

< 4

< 5

< 23

< 9 07/01/21 -

07/29/21

< 6

< 6

< 14

< 7

< 12

< 7

< 10

< 7

< 8

< 25

< 13 07/29/21 - 09/02/21

< 5

< 6

< 12

< 6

< 14

< 6

< 11

< 5

< 6

< 38

< 13 09/02/21 - 09/30/21

< 5

< 6

< 13

< 5

< 14

< 6

< 9

< 6

< 7

< 33

< 14 09/30/21 - 10/28/21

< 5

< 5

< 12

< 5

< 12

< 5

< 9

< 6

< 5

< 25

< 10 10/28/21 -

12/02/21

< 6

< 6

< 14

< 5

< 13

< 7

< 10

< 6

< 6

< 38

< 15 12/02/21 - 12/29/21

< 4

< 5

< 11

< 6

< 14

< 6

< 9

< 6

< 7

< 19

< 8 MEAN COLLECTION PERIOD CONCENTRATIONS OF GAMMA EMITTERS IN DRINKING WATER SAMPLES COLLECTED IN THE VICINITY OF THREE MILE ISLAND NUCLEAR STATION, 2021 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA D-2

TABLE D-II.1 COLLECTION LAB SITE PERIOD Sr-89 Sr-90 Mn-54 Co-58 Fe-59 Co-60 Zn-65 Cs-134 Cs-137 EIS INDP 10/18/21 3120 +/- 273

< 14

< 15

< 41

< 15

< 33

< 12

< 15 GEL INDP 10/18/21

< 11

< 8.3 CONCENTRATIONS OF STRONTIUM AND GAMMA EMITTERS IN FISH SAMPLES COLLECTED IN THE VICINITY OF THREE MILE ISLAND NUCLEAR STATION, 2021 RESULTS IN UNITS OF PCI/KG WET +/- 2 SIGMA K-40 D-3

TABLE D-III.1 COLLECTION LAB SITE PERIOD Cs-134 EIS J2-1 11/02/21 24700 +/- 1920

< 117

< 120 CONCENTRATIONS OF GAMMA EMITTERS IN SEDIMENT SAMPLES COLLECTED IN THE VICINITY OF THREE MILE ISLAND NUCLEAR STATION, 2021 K-40 Cs-137 D-4

TABLE D-IV.1 CONCENTRATIONS OF GAMMA EMITTERS AND STRONTIUM IN FOOD PRODUCT SAMPLES COLLECTION LAB SITE TYPE PERIOD Be-7 I-131 Cs-134 Cs-137 Sr-89 Sr-90 GEL B10-2 Cabbage 08/25/21

< 7.9

< 3.9 EIS H1-2Q Greens 06/30/21 908 +/- 161 4170 +/- 422

< 33

< 23

< 25 EIS H1-2Q Squash 07/28/21 662 +/- 143 2440 +/- 329

< 29

< 23

< 25 EIS H1-2Q Zucchini Leaves 08/25/21 825 +/- 123 2960 +/- 312

< 19

< 18

< 18 EIS H1-2Q Zucchini Leaves 09/30/21 725 +/- 145 1640 +/- 273

< 20

< 22

< 23 K-40 COLLECTED IN THE VICINITY OF THREE MILE ISLAND NUCLEAR STATION, 2021 RESULTS IN UNITS OF PCI/KG WET +/- 2 SIGMA D-5

TABLE D-V.1 AND I-131 IN AIR IODINE SAMPLES COLLECED IN THE VICINITY COLLECTION E1-2Q LAB GROSS BETA I-131 EIS 12/29/20 - 01/06/21 21 +/- 2

< 19 01/06/21 - 01/14/21 31 +/- 2

< 26 01/14/21 - 01/21/21 29 +/- 2

< 22 01/21/21 - 01/28/21 17 +/- 2

< 15 01/28/21 - 02/04/21 11 +/- 2

< 20 02/04/21 - 02/11/21 34 +/- 3

< 18 02/11/21 - 02/19/21 24 +/- 2

< 19 02/19/21 - 02/25/21 38 +/- 3

< 17 02/25/21 - 03/04/21 16 +/- 2

< 13 03/04/21 - 03/11/21 28 +/- 2

< 18 03/11/21 - 03/18/21 26 +/- 2

< 19 03/18/21 - 03/25/21 19 +/- 2

< 19 03/25/21 - 04/01/21 18 +/- 2

< 20 04/01/21 - 04/08/21 30 +/- 2

< 26 04/08/21 - 04/14/21 8 +/- 3

< 22 04/14/21 - 04/21/21 16 +/- 2

< 16 04/21/21 - 04/29/21 30 +/- 2

< 19 04/29/21 - 05/06/21 18 +/- 2

< 30 05/06/21 - 05/14/21 12 +/- 2

< 24 05/14/21 - 05/19/21 28 +/- 3

< 29 05/19/21 - 05/27/21 27 +/- 2

< 11 05/27/21 - 06/03/21 19 +/- 2

< 14 06/03/21 - 06/10/21 25 +/- 2

< 23 06/10/21 - 06/17/21 14 +/- 2

< 17 06/17/21 - 06/24/21 22 +/- 2

< 15 06/24/21 - 07/01/21 16 +/- 2

< 14 07/01/21 - 07/08/21 24 +/- 2

< 27 07/08/21 - 07/14/21 17 +/- 2

< 28 07/14/21 - 07/22/21 24 +/- 2

< 17 07/22/21 - 07/29/21 26 +/- 2

< 19 07/29/21 - 08/05/21 21 +/- 2

< 33 08/05/21 - 08/11/21 29 +/- 3

< 19 08/11/21 - 08/18/21 17 +/- 2

< 29 08/18/21 - 08/26/21 28 +/- 2

< 16 08/26/21 - 09/02/21 30 +/- 2

< 13 09/02/21 - 09/10/21 27 +/- 2

< 22 09/10/21 - 09/17/21 41 +/- 3

< 14 09/17/21 - 09/23/21 21 +/- 2

< 24 09/23/21 - 09/30/21 26 +/- 2

< 26 09/30/21 - 10/07/21 23 +/- 2

< 31 10/07/21 - 10/13/21 19 +/- 2

< 20 10/13/21 - 10/21/21 36 +/- 2

< 24 10/21/21 - 10/28/21 30 +/- 2

< 16 10/28/21 - 11/04/21 16 +/- 2

< 21 11/04/21 - 11/12/21 36 +/- 2

< 20 11/12/21 - 11/18/21 22 +/- 2

< 29 11/18/21 - 11/24/21 19 +/- 2

< 26 11/24/21 - 12/02/21 27 +/- 2

< 18 12/02/21 - 12/10/21 27 +/- 2

< 23 12/10/21 - 12/16/21 30 +/- 3

< 30 12/16/21 - 12/22/21 24 +/- 2

< 28 12/22/21 - 12/29/21 43 +/- 3

< 22 MEAN +/- 2 STD DEV 24 +/- 15 THE MEAN AND TWO STANDARD DEVIATION ARE CALCULATED USING THE POSITIVE VALUES PERIOD E1-2Q CONCENTRATIONS OF GROSS BETA IN AIR PARTICULATE OF THREE MILE ISLAND NUCLEAR STATION, 2021 RESULTS IN UNITS OF E-3 PCI/CU METER +/- 2 SIGMA D-6

TABLE D-V.2 LAB SITE Cs-134 Cs-137 EIS E1-2Q 12/29/20 - 04/01/21 65 +/- 13

< 0.9

< 1.2 04/01/21 - 07/01/21 95 +/- 13

< 1.1

< 1.1 07/01/21 - 09/30/21 79 +/- 12

< 1.2

< 1.3 09/30/21 - 12/29/21 60 +/- 13

< 1.2

< 1.2 MEAN +/- 2 STD DEV 75 +/- 31 PERIOD Be-7 COLLECTION CONCENTRATIONS OF GAMMA EMITTERS IN AIR PARTICULATE SAMPLES COLLECTED IN THE VICINITY OF THREE MILE ISLAND NUCLEAR STATION, 2021 RESULTS IN UNITS OF E-3 PCI/CU METER +/- 2 SIGMA D-7

TABLE D-VI.1 CONCENTRATIONS OF I-131 BY CHEMICAL SEPARATION, GAMMA EMITTERS, AND STRONTIUM IN MILK SAMPLES COLLECTED IN THE VICINITY OF THREE MILE ISLAND NUCLEAR STATION, 2021 COLLECTION LAB SITE DATE I-131 K-40 Cs-134 Cs-137 Ba-140 La-140 Sr-89 EIS G2-1Q 01/13/21

< 0.8 1520 +/- 110

< 4

< 5

< 24

< 7 EIS 02/09/21

< 0.8 1290 +/- 105

< 6

< 6

< 27

< 8 EIS 03/10/21

< 0.8 1390 +/- 141

< 6

< 7

< 33

< 12 EIS 03/24/21

< 0.6 1280 +/- 147

< 10

< 11

< 47

< 14 GEL 01/13/21 - 03/24/21

< 5.0

< 1.7 EIS 04/07/21

< 0.8 1340 +/- 137

< 7

< 7

< 26

< 9 EIS 04/21/21

< 0.4 1360 +/- 137

< 8

< 8

< 35

< 13 EIS 05/05/21

< 0.5 1490 +/- 147

< 6

< 7

< 31

< 6 EIS 05/19/21

< 0.6 1430 +/- 145

< 6

< 7

< 28

< 9 EIS 06/02/21

< 0.6 1370 +/- 137

< 7

< 7

< 30

< 11 EIS 06/16/21

< 0.6 1300 +/- 137

< 6

< 7

< 31

< 10 EIS 06/30/21

< 0.8 1050 +/- 115

< 8

< 9

< 37

< 14 GEL 04/07/21 - 06/30/21

< 7.2

< 1.7 EIS 07/14/21

< 0.7 1280 +/- 136

< 7

< 8

< 36

< 11 EIS 07/28/21

< 0.7 1310 +/- 137

< 7

< 7

< 32

< 11 EIS 08/11/21

< 0.5 1370 +/- 156

< 11

< 10

< 42

< 13 EIS 08/25/21

< 0.7 1180 +/- 138

< 9

< 10

< 37

< 11 EIS 09/09/21

< 0.7 1460 +/- 149

< 8

< 8

< 32

< 10 EIS 09/23/21

< 0.6 1490 +/- 145

< 6

< 7

< 29

< 12 GEL 07/14/21 - 09/23/21

< 4.3

< 1.5 EIS 10/06/21

< 0.5 1310 +/- 144

< 8

< 9

< 35

< 12 EIS 10/20/21

< 0.6 1430 +/- 149

< 9

< 9

< 37

< 11 EIS 11/04/21

< 0.8 1320 +/- 138

< 6

< 6

< 30

< 12 EIS 11/18/21

< 0.4 1610 +/- 149

< 6

< 7

< 31

< 11 EIS 12/22/21

< 0.6 1620 +/- 165

< 7

< 9

< 34

< 13 GEL 10/06/21 - 12/22/21

< 3.7

< 1.5 MEAN +/- 2 STD DEV 1373 +/- 263 THE MEAN AND TWO STANDARD DEVIATION ARE CALCULATED USING THE POSITIVE VALUES Sr-90 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA D-8

FIGURE D-1 MONTHLY GROSS BETA CONCENTRATIONS IN DRINKING WATER SAMPLES COLLECTED FROM TMINS LOCATION Q9-1Q, 2021 0.0 1.0 2.0 3.0 4.0 5.0 6.0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec pCi/liter MONTH QC-LAB PRIMARY - LAB D-9

FIGURE D-2 WEEKLY GROSS BETA CONCENTRATIONS IN AIR PARTICULATE SAMPLES COLLECTED FROM TMINS LOCATION E1-2Q, 2021 0

10 20 30 40 50 60 1

4 7

10 13 16 19 22 25 28 31 34 37 40 43 46 49 52 E-3 pCi/cubic meter WEEK NO.

QC - LAB PRIMARY - LAB D-10

APPENDIX E INTER-LABORATORY COMPARISON PROGRAM

Intentionally left blank

Month/Year Identification Number Matrix Nuclide Units TBE Reported Value Known Value (a)

Ratio of TBE to Analytics Result Evaluation (b)

March 2021 E13466 Milk Sr-89 pCi/L 84.6 87.1 0.97 A

Sr-90 pCi/L 11.5 12.6 0.91 A

E13467 Milk Ce-141 pCi/L 111 125 0.89 A

Co-58 pCi/L 123 128 0.96 A

Co-60 pCi/L 140 154 0.91 A

Cr-51 pCi/L 252 242 1.04 A

Cs-134 pCi/L 130 151 0.86 A

Cs-137 pCi/L 110 110 1.00 A

Fe-59 pCi/L 105 109 0.96 A

I-131 pCi/L 77.6 86.9 0.89 A

Mn-54 pCi/L 111 112 0.99 A

Zn-65 pCi/L 200 211 0.95 A

E13468 Charcoal I-131 pCi 83.5 88.5 0.94 A

E13469 AP Ce-141 pCi 103.0 103 1.00 A

Co-58 pCi 93.3 105 0.89 A

Co-60 pCi 136 126 1.08 A

Cr-51 pCi 213 198 1.07 A

Cs-134 pCi 123.0 124 0.99 A

Cs-137 pCi 86.3 90.1 0.96 A

Fe-59 pCi 81.3 89.6 0.91 A

Mn-54 pCi 93.5 92.0 1.02 A

Zn-65 pCi 166 173 0.96 A

E13470 Soil Ce-141 pCi/g 0.232 0.262 0.89 A

Co-58 pCi/g 0.251 0.268 0.94 A

Co-60 pCi/g 0.306 0.322 0.95 A

Cr-51 pCi/g 0.517 0.506 1.02 A

Cs-134 pCi/g 0.263 0.317 0.83 A

Cs-137 pCi/g 0.278 0.301 0.92 A

Fe-59 pCi/g 0.228 0.229 1.00 A

Mn-54 pCi/g 0.221 0.235 0.94 A

Zn-65 pCi/g 0.448 0.441 1.02 A

E13471 AP Sr-89 pCi 92.2 95.5 0.97 A

Sr-90 pCi 11.7 13.9 0.84 A

(a) The Analytics known value is equal to 100% of the parameter present in the standard as determined by gravimetric and/or volumetric measurements made during standard preparation (b)

Analytics evaluation based on TBE internal QC limits:

A = Acceptable - reported result falls within ratio limits of 0.80-1.20 W = Acceptable with warning - reported result falls within 0.70-0.80 or 1.20-1.30 N = Not Acceptable - reported result falls outside the ratio limits of < 0.70 and > 1.30 Analytics Environmental Radioactivity Cross Check Program Teledyne Brown Engineering Environmental Services (Page 1 of 2)

Table E.1 E-1

Month/Year Identification Number Matrix Nuclide Units TBE Reported Value Known Value (a)

Ratio of TBE to Analytics Result Evaluation (b)

Analytics Environmental Radioactivity Cross Check Program Teledyne Brown Engineering Environmental Services September 2021 E13472 Milk Sr-89 pCi/L 66.4 85.4 0.78 W

Sr-90 pCi/L 11.9 14.0 0.85 A

E13473 Milk Ce-141 pCi/L 118 114 1.03 A

Co-58 pCi/L 116 118 0.98 A

Co-60 pCi/L 142 145 0.98 A

Cr-51 pCi/L 244 236 1.03 A

Cs-134 pCi/L 81 93.1 0.87 A

Cs-137 pCi/L 105 112 0.94 A

Fe-59 pCi/L 105 102 1.03 A

I-131 pCi/L 65.1 85.6 0.76 W

Mn-54 pCi/L 128 128 1.00 A

Zn-65 pCi/L 158 153 1.03 A

E13474 Charcoal I-131 pCi 85.2 90.9 0.94 A

E13475 AP Ce-141 pCi 126 135 0.94 A

Co-58 pCi 148 139 1.07 A

Co-60 pCi 183 171 1.07 A

Cr-51 pCi 322 278 1.16 A

Cs-134 pCi 118 110 1.08 A

Cs-137 pCi 147 132 1.12 A

Fe-59 pCi 131 120 1.09 A

Mn-54 pCi 161 151 1.06 A

Zn-65 pCi 202 180 1.12 A

E13476 Soil Ce-141 pCi/g 0.215 0.219 0.98 A

Co-58 pCi/g 0.208 0.226 0.92 A

Co-60 pCi/g 0.277 0.277 1.00 A

Cr-51 pCi/g 0.388 0.452 0.86 A

Cs-134 pCi/g 0.157 0.178 0.88 A

Cs-137 pCi/g 0.270 0.284 0.95 A

Fe-59 pCi/g 0.218 0.195 1.12 A

Mn-54 pCi/g 0.239 0.246 0.97 A

Zn-65 pCi/g 0.312 0.293 1.06 A

E13477 AP Sr-89 pCi 85.6 68.3 1.25 W

Sr-90 pCi 12.6 11.2 1.13 A

(a) The Analytics known value is equal to 100% of the parameter 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 2)

Table E.1 E-2

Month/Year Identification Number Matrix Nuclide Units TBE Reported Value Known Value (a)

Acceptance Range Evaluation (b)

February 2021 21-GrF44 AP Gross Alpha Bq/sample 0.371 1.77 0.53 - 3.01 N(3)

Gross Beta Bq/sample 0.731 0.65 0.325 - 0.974 A

21-MaS44 Soil Ni-63 Bq/kg 310 689.0 482 - 896 N(4)

Tc-99 Bq/kg 457 638 447 - 829 W

21-MaSU44 Urine Cs-134 Bq/L 2.34 2.73 1.91 - 3.55 A

Cs-137 Bq/L 2.54 2.71 1.90 - 3.52 A

Co-57 Bq/L 0.4100 (1)

A Co-60 Bq/L 2.24 2.44 1.71 - 3.17 A

Mn-54 Bq/L 2.03 2.03 1.42 - 2.64 A

K-40 Bq/L 52.8 54.0 38 - 70 A

U-234 Bq/L 0.108 0.0877 0.0614 - 0.114 W

U-238 Bq/L 0.101 0.091 0.064 - 0.118 A

Zn-65 Bq/L 1.06 1.34 (2)

A 21-MaW44 Water Ni-63 Bq/L 6.7 8.2 5.7 - 10.7 A

Tc-99 Bq/L 3.850 4.01 2.81 - 5.21 A

21-RdV44 Vegetation Cs-134 Bq/sample 3.13 3.60 2.5 - 4.7 A

Cs-137 Bq/sample 4.64 4.69 3.28 - 6.10 A

Co-57 Bq/sample 5.25 5.05 3.54 - 6.57 A

Co-60 Bq/sample 2.86 2.99 2.09 - 3.89 A

Mn-54 Bq/sample 5.02 5.25 3.68 - 6.83 A

Sr-90 Bq/sample 0.631 0.673 0.471 - 0.875 A

Zn-65 Bq/sample

-0.233 (1)

A August 2021 21-GrF45 AP Gross Alpha Bq/sample 0.368 0.960 0.288 - 1.632 A

Gross Beta Bq/sample 0.595 0.553 0.277 - 0.830 A

21-MaS45 Soil Ni-63 Bq/kg 546 1280 896 - 1664 N(5)

Tc-99 Bq/kg 453 777 544 - 1010 N(6) 21-MaSU45 Urine Cs-134 Bq/L 3.10 3.62 2.53 - 4.71 A

Cs-137 Bq/L 0.083 (1)

A Co-57 Bq/L 0.844 0.87 0.606 - 1.125 A

Co-60 Bq/L 0.0535 (1)

A Mn-54 Bq/L 0.459 0.417 (2)

A K-40 Bq/L 48.8 54.0 38 - 70 A

U-234 Bq/L 0.133 0.116 0.081 - 0.151 A

U-238 Bq/L 0.137 0.121 0.085 - 0.157 A

Zn-65 Bq/L 0.339 0.420 (2)

A 21-MaW45 Water Ni-63 Bq/L 33.5 39.5 27.7 - 51.4 A

Tc-99 Bq/L 3.5 3.7 2.60 - 4.82 A

21-RdV45 Vegetation Cs-134 Bq/sample 3.42 4.34 3.04 - 5.64 W

Cs-137 Bq/sample 2.14 2.21 1.55 - 2.87 A

Co-57 Bq/sample 4.08 4.66 3.26 - 6.06 A

Co-60 Bq/sample 2.81 3.51 2.46 - 4.56 A

Mn-54 Bq/sample 0.035 (1)

A Sr-90 Bq/sample 1.15 1.320 0.92 - 1.72 A

Zn-65 Bq/sample 2.05 2.43 1.70 - 3.16 A

(a) The MAPEP known value is equal to 100% of the parameter present in the standard as determined by gravimetric and/or volumetric measurements made during standard preparation (b) DOE/MAPEP 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 21-02 (4) See NCR 21-03 (5) See NCR 21-13 (6) Tc-99 cross-checks done for TBE information only - not required DOE's Mixed Analyte Performance Evaluation Program (MAPEP)

Teledyne Brown Engineering Environmental Services (Page 1 of 1)

Table E.2 E-3

Month/Year Identification Number Matrix Nuclide Units TBE Reported Value Known Value (a)

Acceptance Limits Evaluation (b)

March 2021 MRAD-34 Water Am-241 pCi/L 175 157 108 - 201 A

Fe-55 pCi/L 579 275 162 - 400 N(1)

Pu-238 pCi/L 181 171 103 - 222 A

Pu-239 pCi/L 153 142 87.9 - 175 A

Soil Sr-90 pCi/kg 6570 9190 2860 - 14,300 A

AP Fe-55 pCi/filter 107 121 44.2 - 193 A

U-234 pCi/filter 25.99 25.5 18.9 - 29.9 A

U-238 pCi/filter 24.7 25.3 19.1 - 30.2 A

April 2021 RAD-125 Water Ba-133 pCi/L 92.3 90.5 76.2 - 99.6 A

Cs-134 pCi/L 62.9 70.5 57.5 - 77.6 A

Cs-137 pCi/L 161 168 151 - 187 A

Co-60 pCi/L 22.5 20.9 17.7 - 25.8 A

Zn-65 pCi/L 183 177.0 159 - 208 A

GR-A pCi/L 30.8 30.2 15.4 - 39.4 A

GR-B pCi/L 60.1 67.5 46.8 - 74.2 A

U-Nat pCi/L 36.45 36.9 30.0 - 40.8 A

H-3 pCi/L 13,400 14,600 12,800 - 16,100 A

Sr-89 pCi/L 64.5 63.5 51.4 - 71.5 A

Sr-90 pCi/L 22.8 23.0 16.5 - 27.0 A

I-131 pCi/L 28.2 26.7 22.2 - 31.4 A

September 2021 MRAD-35 Water Am-241 pCi/L 68 63.7 43.7 - 81.5 A

Fe-55 pCi/L 179 246 145 - 358 A

Pu-238 pCi/L 102 114 68.5 - 148 A

Pu-239 pCi/L 32 34.3 21.2 - 42.3 A

Soil Sr-90 pCi/kg 6160 6090 1,900 - 9,490 A

AP Fe-55 pCi/filter 493 548 200 - 874 A

Pu-238 pCi/filter 28 28.5 21.5 - 35.0 A

Pu-239 pCi/filter 21 21.6 16.1 - 26.1 A

U-234 pCi/filter 7.95 7.76 5.75 - 9.09 A

U-238 pCi/filter 8.0 7.69 5.81 - 9.17 A

October 2021 RAD-127 Water Ba-133 pCi/L 82.8 87.5 73.6 - 96.2 A

Cs-134 pCi/L 64.0 70.1 57.1 - 77.1 A

Cs-137 pCi/L 145 156 140 - 174 A

Co-60 pCi/L 83.2 85.9 77.3 - 96.8 A

Zn-65 pCi/L 133 145 130 - 171 A

GR-A pCi/L 76.0 66.7 35.0 - 82.5 A

GR-B pCi/L 63.0 55.7 38.1 - 62.6 N(2)

U-Nat pCi/L 52.88 55.5 45.3 - 61.1 A

H-3 pCi/L 13,800 17,200 15,000 - 18,900 N(3)

Sr-89 pCi/L 54.9 61.0 49.1 - 68.9 A

Sr-90 pCi/L 24.8 29.3 21.3 - 34.0 A

I-131 pCi/L 27.4 26.4 21.9 - 31.1 A

December 2021 QR 120121Y Water GR-B pCi/L 47.6 39.8 26.4 - 47.3 N(4)

H-3 pCi/L 17,500 17,800 15,600 - 19,600 A

(a) The ERA known value is equal to 100% of the parameter present in the standard as determined by gravimetric and/or volumetric measurements made during standard preparation.

(b) ERA evaluation:

A = Acceptable - Reported value falls within the Acceptance Limits N = Not Acceptable - Reported value falls outside of the Acceptance Limits (1) See NCR 21-01 (2) See NCR 21-10 (3) See NCR 21-11 (4) See NCR 21-14 ERA Environmental Radioactivity Cross Check Program Teledyne Brown Engineering Environmental Services (Page 1 of 1)

Table E.3 E-4

TABLE E.4 Month/Year Identification Number Matrix Nuclide Units EIS Reported Value Known Value (a)

Ratio of Analytics to EIS Result Evaluation (b)

March 2021 E13390 Milk I-131 pCi/L 105 86.9 121 Pass Detector 4 Ce-141 pCi/L 122 125 98.0 Pass Co-58 pCi/L 126 128 98.7 Pass Co-60 pCi/L 155 154 100 Pass Cr-51 pCi/L 257 242 106 Pass Cs-134 pCi/L 145 151 96.3 Pass Cs-137 pCi/L 116 110 106 Pass Fe-59 pCi/L 116 109 107 Pass Mn-54 pCi/L 122 112 109 Pass Zn-65 pCi/L 195 211 92.6 Pass E13390 Milk I-131 pCi/L 89.0 86.9 102 Pass Detector 5 Ce-141 pCi/L 127 125 102 Pass Co-58 pCi/L 118 128 92.0 Pass Co-60 pCi/L 147 154 95.3 Pass Cr-51 pCi/L 302 242 125 Pass Cs-134 pCi/L 134 151 88.5 Pass Cs-137 pCi/L 111 110 101 Pass Fe-59 pCi/L 121 109 111 Pass Mn-54 pCi/L 118 112 105 Pass Zn-65 pCi/L 190 211 90.0 Pass E13391 Water Gr-B pCi/L 250 283 88.3 Pass S5E E13392 Charcoal I-131 pCi 79.7 88.2 90.4 Pass Detector 4 E13392 Charcoal I-131 pCi 79.5 88.2 90.1 Pass Detector 5 June 2021 E13395 AP Ce-141 pCi 146 132 110 Pass Detector 4 Co-58 pCi 133 131 102 Pass Co-60 pCi 171 158 108 Pass Cr-51 pCi 416 390 107 Pass Cs-134 pCi 136 156 87.0 Pass Cs-137 pCi 138 138 99.8 Pass Fe-59 pCi 161 134 120 Pass Mn-54 pCi 204 183 111 Pass Zn-65 pCi 255 220 116 Fail(1)

E13395 AP Ce-141 pCi 141 132 107 Pass Detector 5 Co-58 pCi 136 131 104 Pass Co-60 pCi 164 158 104 Pass Cr-51 pCi 426 390 109 Pass Cs-134 pCi 138 156 88.4 Pass Cs-137 pCi 142 138 103 Pass Fe-59 pCi 163 134 121 Pass Mn-54 pCi 208 183 114 Pass Zn-65 pCi 230 220 105 Fail(1)

E13396 AP Gr-B pCi 166 143 116 Pass S5E Gr-B pCi 163 143 114 Pass (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 EIS internal QC limits in accordance with the NRC Resolution Test criteria Exelon Industrial Services (2021)

Analytics Environmental Radioactivity Cross Check Program

TABLE E.4 Month/Year Identification Number Matrix Nuclide Units EIS Reported Value Known Value (a)

Ratio of Analytics to EIS Result Evaluation (b)

Exelon Industrial Services (2021)

Analytics Environmental Radioactivity Cross Check Program E13394 Water I-131 pCi/L 103 92.0 112 Pass Detector 3 Ce-141 pCi/L 161 180 89.4 Pass Co-58 pCi/L 176 179 98.5 Pass Co-60 pCi/L 222 215 103 Pass Cr-51 pCi/L 506 533 95.0 Pass Cs-134 pCi/L 198 213 92.9 Pass Cs-137 pCi/L 193 188 103 Pass Fe-59 pCi/L 202 183 110 Pass Mn-54 pCi/L 250 249 100 Pass Zn-65 pCi/L 304 300 101 Pass E13394 Water I-131 pCi/L 94.3 92.0 103 Pass Detector 4 Ce-141 pCi/L 176 180 97.6 Pass Co-58 pCi/L 173 179 96.5 Pass Co-60 pCi/L 216 215 100 Pass Cr-51 pCi/L 514 533 96.4 Pass Cs-134 pCi/L 195 213 91.5 Pass Cs-137 pCi/L 193 188 103 Pass Fe-59 pCi/L 181 183 98.7 Pass Mn-54 pCi/L 236 249 94.9 Pass Zn-65 pCi/L 298 300 99.3 Pass E13394 Water I-131 pCi/L 91.2 92.0 99.1 Pass Detector 5 Ce-141 pCi/L 201 180 112 Pass Co-58 pCi/L 168 179 93.9 Pass Co-60 pCi/L 226 215 105 Pass Cr-51 pCi/L 521 533 97.7 Pass Cs-134 pCi/L 193 213 90.6 Pass Cs-137 pCi/L 187 188 99.5 Pass Fe-59 pCi/L 199 183 109 Pass Mn-54 pCi/L 247 249 99.2 Pass Zn-65 pCi/L 275 300 91.7 Pass E13393 Water Gr-B pCi/L 225 250 90 Pass S5E September 2021 E13397 AP Gr-B pCi 220 217 101 Pass S5E Gr-B pCi 211 217 97 Pass December 2021 E13398 AP Ce-141 pCi 91.5 99.7 91.8 Pass Detector 4 Co-58 pCi 79.1 86.6 91.3 Pass Co-60 pCi 167 169 98.5 Pass Cr-51 pCi 190 222 85.4 Pass Cs-134 pCi 97.7 126 77.5 Pass Cs-137 pCi 79.2 88.7 89.3 Pass Fe-59 pCi 85.3 85.3 100 Pass Mn-54 pCi 110 115 95.5 Pass Zn-65 pCi 180 195 92.5 Fail(1)

(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 EIS internal QC limits in accordance with the NRC Resolution Test criteria

TABLE E.4 Month/Year Identification Number Matrix Nuclide Units EIS Reported Value Known Value (a)

Ratio of Analytics to EIS Result Evaluation (b)

Exelon Industrial Services (2021)

Analytics Environmental Radioactivity Cross Check Program December 2021 E13398 AP Ce-141 pCi 94.9 99.7 95.2 Pass Detector 5 Co-58 pCi 79.7 86.6 92.0 Pass Co-60 pCi 154 169 91.2 Pass Cr-51 pCi 212 222 95.3 Pass Cs-134 pCi 94.7 126 75.1 Pass Cs-137 pCi 76.4 88.7 86.2 Pass Fe-59 pCi 92.6 85.3 109 Pass Mn-54 pCi 110 115 95.8 Pass Zn-65 pCi 182 195 93.1 Fail(1)

E13399 Water Gr-B pCi/L 287 281 102 Pass S5E E13400 Charcoal I-131 pCi 91.7 94.3 97.2 Pass Detector 3 E13400 Charcoal I-131 pCi 89.1 94.3 94.5 Pass Detector 4 E13400 Charcoal I-131 pCi 88.9 94.3 94.3 Pass Detector 5 E13401 Milk I-131 pCi/L 84.3 90.3 93.4 Pass Detector 3 Ce-141 pCi/L 131 132 98.9 Pass Co-58 pCi/L 104 114 91.2 Pass Co-60 pCi/L 224 223 101 Pass Cr-51 pCi/L 285 293 97.3 Pass Cs-134 pCi/L 160 166 96.4 Pass Cs-137 pCi/L 114 117 97.5 Pass Fe-59 pCi/L 125 113 111 Pass Mn-54 pCi/L 156 152 102 Pass Zn-65 pCi/L 253 257 98.4 Pass E13401 Milk I-131 pCi/L 94.8 90.3 105 Pass Detector 4 Ce-141 pCi/L 115 132 87.3 Pass Co-58 pCi/L 106 114 93.3 Pass Co-60 pCi/L 232 223 104 Pass Cr-51 pCi/L 265 293 90.6 Pass Cs-134 pCi/L 161 166 96.9 Pass Cs-137 pCi/L 116 117 99.3 Pass Fe-59 pCi/L 119 113 105 Pass Mn-54 pCi/L 164 152 108 Pass Zn-65 pCi/L 261 257 102 Pass (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 EIS internal QC limits in accordance with the NRC Resolution Test criteria

TABLE E.5 Month/Year ID Number Matrix Nuclide Units EIS Reported Value Known Value (a)

Acceptance Ratio of ERA to EIS Result Evaluation (b)

April 2021 RAD-125 Water Ba-133 pCi/L 86.1 90.5 95.1 Pass Detector 3 Cs-134 pCi/L 69.0 70.5 97.9 Pass Cs-137 pCi/L 163 168 97.0 Pass Co-60 pCi/L 22.3 20.9 107 Pass Zn-65 pCi/L 171.5 177 97 Pass I-131 pCi/L 28.7 26.7 107 Pass S5E GR-B pCi/L 58.1 67.5 86.0 Pass September 2021 MRAD-35 AP Cs-134 pCi 218 241 90.5 Pass Detector 4 Cs-137 pCi 210 187 112 Pass Co-60 pCi 356 310 115 Pass Zn-65 pCi 411 366 112 Pass October 2021 RAD-127 Water Ba-133 pCi/L 83.9 87.5 95.9 Pass Detector 5 Cs-134 pCi/L 66.8 70.1 95.3 Pass Cs-137 pCi/L 152 156 97.4 Pass Co-60 pCi/L 83.4 85.9 97.1 Pass Zn-65 pCi/L 142 145 97.9 Pass Detector 3 I-131 pCi/L 29.9 26.4 113 Pass (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 based on EIS internal QC limits in accordance with the NRC Resolution Test criteria (2) Passed vendor acceptance criteria, but failed NRC Resolution Test criteria ERA Environmental Radioactivity Cross Check Program Exelon Industrial Services (2021)

TABLE E.6 Quarter/Year Identification Number Matrix Nuclide Units Reported Value Known Value (a)

Acceptance Range Evaluation (b) 2nd/2021 21-MaW44 Water H-3 Bq/L 2.27 False Positive Test A

Sr-90 Bq/L 4.95 4.47 3.13 - 5.81 A

21-MaS44 Soil Sr-90 Bq/Kg 313 272.00 190 - 354 A

21-RdV44 Veg Sr-90 Bq 0.444 0.673 0.471 - 0.875 N(1) 4th/2021 21-MaW45 Water H-3 Bq/L 231 250 175 - 325 A

Sr-90 Bq/L 3.5 3.86 2.70 - 5.02 A

21-MaS45 Soil Sr-90 Bq/Kg 0.161 False Positive Test A

21-RdV45 Veg Sr-90 Bq 1.1 1.320 0.92 - 1.72 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) DOE/MAPEP 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) Correactive Action information in IV Results & Discussion, Section G DOE's Mixed Analyte Performance Evaluation Program (MAPEP)

GEL Laboratories (H-3 & Sr-90)

E-7

TABLE E.7 Quarter/Year Identification Number Matrix Nuclide Units Reported Value Known Value (a)

Acceptance Limits Evaluation (b) 1st/2021 RAD-124 Water H-3 pCi/L 2,000 2,120 1,750 - 27,800 A

H-3 pCi/L 2,020 2,120 1,750 - 27,800 A

Sr-89 pCi/L 74.6 61.3 49.4 - 69.2 N(1)

Sr-89 pCi/L 65.7 61.3 49.4 - 69.2 A

Sr-90 pCi/L 32.5 40.6 29.9 - 46.7 A

Sr-90 pCi/L 38.2 40.6 29.9 - 46.7 A

2nd/2021 MRAD-34 Water H-3 pCi/L 24,900 22,800 17,200 - 27,800 A

Sr-90 pCi/L 736 671 483 - 829 A

Soil Sr-90 pCi/Kg 10,200 9,190 2,860 - 14,300 A

Veg Sr-90 pCi/Kg 986 1,260 710 - 1,640 A

Sr-90 pCi/Kg 986 1,260 710 - 1,640 A

RAD-125 Water Sr-89 pCi/L 59 64 51.4 - 71.5 A

3rd/2021 RAD-126 Water H-3 pCi/L 9,820 10,400 9,050 - 11,400 A

H-3 pCi/L 10,300 10,400 9,050 - 11,400 A

Sr-89 pCi/L 50.3 55.9 44.6 - 63.6 A

Sr-90 pCi/L 46.2 40.1 29.5 - 46.1 N(2) 4th/2021 MRAD-35 Water H-3 pCi/L 12,600 12,800 9,650 - 15,600 A

Sr-90 pCi/L 915 936 674 - 1,160 A

Soil Sr-90 pCi/Kg 8,770 6,090 1,900 - 9,490 A

Veg Sr-90 pCi/Kg 5,760 5,720 3,220 - 7,450 A

Sr-90 pCi/Kg 986 1,260 710 - 1,640 A

RAD-127 Water Sr-90 pCi/L 29 29 21.3 - 34.0 A

(a) The ERA known value is equal to 100% of the parameter present in the standard as determined by gravimetric and/or volumetric measurements made during standard preparation.

(b) ERA evaluation: A = Acceptable - Reported value falls within the Acceptance Limits N = Not Acceptable - Reported value falls outside of the Acceptance Limits (1) Correactive Action information in IV Results & Discussion, Section G (2) Correactive Action information in IV Results & Discussion, Section G ERA Environmental Radioactivity Cross Check Program GEL Laboratories (H-3 & Sr-89/90)

E-8

TABLE E.8 Quarter/Year Identification Number Matrix Nuclide Units Reported Value Known Value (a)

Acceptance Limits Evaluation (b) 1st/2021 E13357 Milk Sr-89 pCi/L 95.5 87.1 1.10 A

Sr-90 pCi/L 11.4 12.6 0.90 A

3rd/2021 E13365 Milk Sr-89 pCi/L 89.2 85.4 1.04 A

Sr-90 pCi/L 10.1 14.0 0.72 A

4th/2021 E13370 Milk Sr-89 pCi/L 75.4 90.8 0.83 A

Sr-90 pCi/L 11.0 13.0 0.85 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 laboratory's internal acceptance criteria of 75% - 125%:

A = Acceptable - Reported value falls within the Acceptance Limits N = Not Acceptable - Reported value falls outside of the Acceptance Limits Analytics Environmental Radioactivity Cross Check Program GEL Laboratories (Sr-89/90 only)

E-9

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APPENDIX F ANNUAL RADIOLOGICAL GROUNDWATER PROTECTION PROGRAM REPORT (ARGPPR)

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Docket No:

50-289 50-320 THREE MILE ISLAND NUCLEAR STATION UNITS 1 AND 2 Annual Radiological Groundwater Protection Program Report (ARGPPR) 1 January through 31 December 2021 Prepared By Teledyne Brown Engineering Environmental Services Three Mile Island Nuclear Station Middletown, PA 17057 April 2022

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i Table Of Contents I. Summary and Conclusions.............................................................................................. 1 II. Introduction...................................................................................................................... 2 A. Objectives of the RGPP....................................................................................... 3 B. Implementation of the Objectives........................................................................ 3 C. Program Description............................................................................................ 4 D. Characteristics of Tritium (H-3)............................................................................ 4 III. Program Description....................................................................................................... 6 A. Sample Analysis.................................................................................................. 6 B. Data Interpretation............................................................................................... 6 IV. Results and Discussion................................................................................................. 8 A. Groundwater Results........................................................................................... 8 B. Surface Water Results......................................................................................... 9 C. Storm Water Results........................................................................................... 9 D. Precipitation Water Results................................................................................. 9 E. Leaks, Spills, and Releases............................................................................... 10 F. Actions Taken.................................................................................................... 10 G. Missed Samples................................................................................................ 10

ii Appendices Appendix A Location Designation Tables Table A-1 Radiological Groundwater Protection Program - Sampling Locations, Three Mile Island Nuclear Station, 2021 Figures Figure A-1 Sampling Locations at the Three Mile Island Nuclear Station, 2021 Appendix B Data Tables Tables Table B-I.1 Concentrations of Tritium and Strontium in Groundwater Samples Collected as Part of the Radiological Groundwater Protection Program, Three Mile Island Nuclear Station, 2021 Table B-I.2 Concentrations of Gamma Emitters in Groundwater Samples Collected in the Vicinity of Three Mile Island Nuclear Station, 2021 Table B-I.3 Concentrations of Hard-To-Detects in Groundwater Samples Collected as Part of the Radiological Groundwater Protection Program, Three Mile Island Generating Station, 2021 Table B-II.1 Concentrations of Tritium in Storm Water Samples Collected as Part of the Radiological Groundwater Protection Program, Three Mile Island Nuclear Station, 2021 Table B-II.2 Concentrations of Gamma Emitters in Storm Water Samples Collected in the Vicinity of Three Mile Island Nuclear Station, 2021 Table B-IV.1 Concentrations of Tritium in Precipitation Water Samples Collected as Part of the Radiological Groundwater Protection Program, Three Mile Island Nuclear Station, 2021 Appendix C Data Tables - Comparison Tables Table C-I.1 Concentrations of Tritium, Strontium in Groundwater Split Samples Collected as Part of the Radiological Groundwater Protection Program, Three Mile Island Nuclear Station, 2021

iii Table C-I.2 Concentrations of Gamma Emitters in Groundwater Split Samples Collected as Part of the Radiological Groundwater Protection Program, Three Mile Island Nuclear Station, 2021 Table C-I.3 Concentrations of Hard-To-Detects in Groundwater Split Samples Collected as Part of the Radiological Groundwater Protection Program, Three Mile Island Generating Station, 2021 Table C-II.1 Concentrations of Tritium in Precipitation Water Split Samples Collected as Part of the Radiological Groundwater Protection Program, Three Mile Island Nuclear Station, 2021

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 Three Mile Island Nuclear Station. This report covers groundwater, surface water, storm water, and precipitation samples collected from the environment, both on and off station property in 2021. During that time period 255 analyses were performed on 169 samples from 57 locations.

In assessing all the data gathered for this report, it was concluded that the operation of Three Mile Island Nuclear Station had no adverse radiological impact on the environment.

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

Strontium-89 (Sr-89) and Strontium-90 (Sr-90) were not detected at a concentration greater than their respective LLD of 10 and 1 picocurie per liter (pCi/L) in the groundwater samples tested.

Tritium was not detected in any ground water, storm water or precipitation 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. Low levels of tritium were detected at concentrations greater than the LLD of 200 pCi/L in 28 of 48 groundwater monitoring locations. The groundwater tritium concentrations ranged from 181 +/- 115 pCi/L to 2,170 +/- 284 pCi/L. Tritium that was detected in groundwater at the Station is believed to be the result of previous tank leakage, historical releases, the recapture of gaseous tritium releases via rainwater, and/or background from external sources greater than 200 pCi/L. Tritium was detected at the stormwater location with concentrations ranging from 188 +/- 114 pCi/L to 193 +/- 120 pCi/L. Tritium was detected in 5 of 8 precipitation water locations. The concentrations ranged from 199 +/- 120 to 819 +/- 155 pCi/L.

Hard-To-Detect analyses include Fe-55, Ni-63, Am-241, Cm-242, Cm-243/244, Pu-238, Pu-239/240, U-234, U-235 and U-238. Only Fe-55 and Ni-63 were analyzed in 2021. Action levels trigger monitoring requirements for these analyses.

II.

Introduction The Three Mile Island Nuclear Station (TMINS) established a revised and more comprehensive groundwater monitoring program in 2006 as part of an Exelon Nuclear fleetwide assessment.

Conestoga Rovers & Associates (CRA) performed the initial assessment. CRA prepared a Hydrogeologic Investigation Report (HIR) for Exelon to determine whether groundwater at and near TMINS has been adversely impacted by any releases of radionuclides. The CRA report documents the results of the May 2006 Hydrogeologic Investigation Work Plan. CRA assessed groundwater quality at the Station and identified locations designated as Areas for Further Evaluation. The results and conclusions of this Phase 1 study were made available to state and federal regulators, as well as the public on an Exelon web site for station specific reports.

As a result of the Phase 1 study, the Radiological Groundwater Protection Program (RGPP) was revised to a long term monitoring program. This report covers those analyses performed by Teledyne Brown Engineering (TBE) and Exelon Industrial Services (EIS)/GEL Laboratories on well water, surface water, storm water, and precipitation water samples collected in 2021. TMINS groundwater movement is into the Susquehanna River which surrounds the station on all sides.

In September 2015, GHD completed an additional five-year update hydrogeologic investigation report for the Station (NEI 07-07, Hydrogeologic Investigation Report). The referenced report summarized station activities since the 2006 hydrogeologic investigation report, including changes at the Station as well as RGPP sampling activities and groundwater flow. Relevant conclusions from the report are:

• None of the AFEs identified in 2006 indicate current impacts to groundwater and are no longer considered AFEs.

• One new AFE, AFE-TMI-6-BWST, was identified based on laboratory analytical data.

• In July 2012, elevated tritium concentrations were noted for a sample collected from an electric vault west of MS-22. The source of this elevated tritium concentration was believed to be the BWST.

• Tritium is not migrating off of the Station property at concentrations greater than the USEPA Drinking Water Standard of 20,000 pCi/L.

• Gamma-emitting radionuclides associated with licensed plant operations were not detected at concentrations greater than their respective LLDs.

• Strontium 89 or 90 were not detected at concentrations greater than their respective LLDs.

In December 2019, GHD completed an additional five-year update hydrogeologic investigation report for the Station (NEI 07-07, Hydrogeologic Investigation Report). The referenced report summarized station activities since the 2015

hydrogeologic investigation report, including changes at the Station as well as RGPP sampling activities and groundwater flow. Relevant conclusions from the report are:

• AFE-TMI-6-BWST, 1 BWST is retained as an Area of Further Evaluation (AFE)

This report covers those analyses performed by Teledyne Brown Engineering (TBE) and Gel Laboratories (subcontracted from Exelon Industrial Services) on samples collected in 2021.

A.

Objectives of the RGPP The long-term objectives of the Radiological Groundwater Protection Program (RGPP) are as follows:

1. Identify suitable locations to monitor and evaluate potential impacts from station operations before significant radiological impact to the environment and potential drinking water sources.

2. Understand the local hydrogeologic regime in the vicinity of the station and maintain up-to-date knowledge of flow patterns on the surface and shallow subsurface.

3. Perform routine water sampling and radiological analysis of water from selected locations.

4. Notify stakeholders in a timely manner for new leaks, spills, or other detections with potential radiological significance.

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 Three Mile Island Nuclear Station as discussed below:

1. Three Mile Island Nuclear Station continues to sample and monitor the groundwater at the station in accordance with station procedures.

Sample frequencies and locations are adjusted based on monitoring results and investigations.

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

3. Three Mile Island Nuclear Station will continue to perform routine sampling and radiological analysis of water from selected locations.

4. Three Mile Island Nuclear Station has implemented procedures to identify and report leaks, spills, or other detections with potential radiological significance in a timely manner.

5. Three Mile Island Nuclear Station staff and consulting hydrogeologist assess analytical results on an ongoing basis to identify adverse trends.

C.

Program Description

1. Sample Collection Sample locations can be found in Table A-1 and Figure A-1, Appendix A.

Groundwater, Storm Water, and Precipitation Samples of water are collected, managed, transported and analyzed in accordance with approved procedures. Groundwater, storm water and precipitation 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. For split samples, collectors will periodically collect samples that are sent to Exelon Industrial Services/GEL Laboratories to confirm that TBE is producing comparable data. Analytical laboratories are subject to internal quality assurance programs, industry cross-check programs, as well as nuclear industry audits. Station personnel review and evaluate all analytical data deliverables as data are received.

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

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." 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 is created in the environment from naturally-occurring processes both cosmic and subterranean, as well as from anthropogenic (i.e.,

man-made) sources. Tritium is produced naturally in the upper atmosphere when cosmic rays strike air molecules. This cosmogenic tritium combines with oxygen to form tritiated water, which will then enter the hydrologic cycle. Below ground, lithogenic tritium is produced by the bombardment of natural lithium present in crystalline rocks by neutrons produced by the radioactive decay of naturally abundant uranium and thorium. Lithogenic production of tritium is usually negligible compared to other sources due to the limited abundance of lithium in rock. The lithogenic tritium is introduced directly to groundwater.

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

The chemical properties of tritium are essentially those of ordinary hydrogen. 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, all tritium is essentially cleared. Organically bound tritium (tritium that is incorporated in organic compounds) can remain in the body for a longer period.

Tritium has a radiological half-life of approximately 12.3 years. It decays spontaneously to Helium-3 (He-3). This radioactive decay releases a beta particle (low-energy electron). The radioactive decay of tritium is the source of the health risk from exposure to tritium. Tritium is one of the least dangerous radionuclides, because it emits very weak 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.

III.

Program Description A.

Sample Analysis This section describes the general analytical methodologies used by TBE and Exelon Industrial Services (EIS)/GEL Laboratories to analyze the environmental samples for radioactivity for the Three Mile Island Nuclear Station RGPP in 2021.

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

1.

Concentrations of gamma-emitters in groundwater and storm water

2.

Concentrations of strontium in groundwater

3.

Concentrations of tritium in groundwater, precipitation water and storm water

4.

Concentrations of Am-241 in groundwater

5.

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

6.

Concentrations of Pu-238 and PU-239/240 in groundwater

7.

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

8.

Concentrations of Fe-55 in groundwater

9.

Concentrations of Ni-63 in groundwater B.

Data Interpretation

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

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

Statistically, the exact value of a measurement is expressed as a range with a stated level of confidence. The convention is to report results with a 95% level of confidence. The uncertainty comes from calibration standards, sample volume or weight measurements, sampling uncertainty and other factors. Exelon reports the uncertainty of a measurement created by statistical process (counting error).

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

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

For groundwater and storm water 13 nuclides, Be-7, K-40, Mn-54, Co-58, Fe-59, Co-60, Zn-65, Nb-95, Zr-95, Cs-134, Cs-137, Ba-140 and La-140 were reported.

The radio-analytical laboratory counts tritium results to an LLD of 200 pCi/L. Typically, the lowest positive measurement will be reported within a range of 40 - 240 pCi/L or 140 +/- 100 pCi/L. Clearly, these sample results cannot be distinguished as different from background at this concentration.

IV.

Results and Discussion A.

Groundwater Results Samples were collected from on and off-site wells in accordance with the station radiological groundwater protection program. Analytical results and anomalies are discussed below.

Tritium Samples from 48 locations were analyzed for tritium activity. Tritium values ranged from the detection limit to 2,170 pCi/L.

(Table B-I.1, Appendix B)

Tritium Split Samples Samples from 9 locations were analyzed for tritium activity. Tritium values ranged from the detection limit to 231 pCi/L. (Table C-I.1, Appendix C)

Strontium Sr-89 and Sr-90 were not detected above their required detection limits of 10 and 1.0 pCi/L, respectively. (Table B-I.1, Appendix B)

Strontium Split Samples Sr-89 and Sr-90 were not detected above their required detection limits of 10 and 1.0 pCi/L, respectively. (Table C-I.1, Appendix C)

Gamma Emitters Gamma-emitting nuclides were not analyzed in 2021.

(Table B-I.2, Appendix B)

Gamma Emitters Split Samples Gamma-emitting nuclides were not analyzed for split samples in 2021.

(Table C-I.2, Appendix C)

Hard-To-Detect Only Fe55 and Ni-63 from the Hard-To-Detect analyses list (including Am-241, Cm-242, Cm-243/244, Pu-238, Pu-239/240, U-234, U-235, U-238), were analyzed at 7 locations in 2021. Neither Fe-55 nor Ni-63 were detected in any sample. (Table B-I.3, Appendix B)

Hard-To-Detect Split Samples Hard to detects were not analyzed on any split samples in 2021.

(Table C-I.3, Appendix C)

B.

Surface Water Results No samples were collected from surface water locations in 2021.

C.

Storm Water Results Samples were collected from storm water locations in accordance with the station radiological groundwater protection program. Analytical results and anomalies are discussed below.

Tritium Four samples from one location analyzed for tritium. Tritium activity was detected in 2 of the 4 samples. The concentrations ranged from 188-193 pCi/L. (Table B-II.1, Appendix B)

Gamma Emitters Four samples from one location were analyzed for gamma-emitting nuclides.

No gamma-emitting nuclides were detected. (Table B-II.2, Appendix B)

D.

Precipitation Water Results Samples were collected at 8 locations. The following analyses were performed:

Tritium Samples from 8 locations were analyzed for tritium activity. Tritium activity was detected at 5 of 8 locations. The concentrations ranged from 199 to 819 pCi/L. (Table B-III.1, Appendix B)

Tritium Split Samples Samples from one location were analyzed for tritium activity. Tritium was detected in 2 of the 4 samples. The concentrations ranged from 296 to 747 pCi/L. (Table C-II.1, Appendix C).

E.

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

F.

Actions Taken There were no compensatory/corrective actions taken in 2021.

G.

Missed Samples There were no missed samples in 2021.

APPENDIX A LOCATION DESIGNATION & DISTANCE

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TABLE A-1:

Radiological Groundwater Protection Program - Sampling Locations, Three Mile Island Nuclear Station, 2021 Site Site Type 48S Production Potable Well EDCB Storm Water MS-1 Monitoring Well MS-2 Monitoring Well MS-3 Monitoring Well MS-4 Monitoring Well MS-5 Monitoring Well MS-7 Monitoring Well MS-8 Monitoring Well MS-20 Monitoring Well MS-21 Monitoring Well MS-22 Monitoring Well MW-1 Monitoring Well MW-2 Monitoring Well MW-TMI-1D Monitoring Well MW-TMI-2D Monitoring Well MW-TMI-3I Monitoring Well MW-TMI-4I Monitoring Well MW-TMI-4S Monitoring Well MW-TMI-6D Monitoring Well MW-TMI-6I Monitoring Well MW-TMI-7S Monitoring Well MW-TMI-8S Monitoring Well MW-TMI-9I Monitoring Well MW-TMI-9S Monitoring Well MW-TMI-10D Monitoring Well MW-TMI-10I Monitoring Well MW-TMI-10S Monitoring Well MW-TMI-12S Monitoring Well MW-TMI-13I Monitoring Well MW-TMI-14D Monitoring Well MW-TMI-14I Monitoring Well MW-TMI-16D Monitoring Well MW-TMI-18D Monitoring Well MW-TMI-19I Monitoring Well MW-TMI-20I Monitoring Well MW-TMI-21D Monitoring Well MW-TMI-21I Monitoring Well MW-TMI-21S Monitoring Well MW-TMI-22D Monitoring Well MW-TMI-22I Monitoring Well MW-TMI-22S Monitoring Well NW-A Production Well NW-B Production Well NW-C Production Well OS-14 Monitoring Well OS-16 Monitoring Well OS-18 Monitoring Well OSF Production Potable Well RW-1 Monitoring Well TM-PR-EDCB Precipitation Water TM-PR-ESE Precipitation Water TM-PR-MS-1 Precipitation Water TM-PR-MS-2 Precipitation Water TM-PR-MS-4 Precipitation Water TM-PR-MS-8 Precipitation Water TM-PR-MW-22S Precipitation Water TM-PR-RW-1 Precipitation Water A-1

Figure A - 1 Sampling Locations at the Three Mile Island Nuclear Station, 2021 A-2

APPENDIX B DATA TABLES

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TABLE B-I.1 COLLECTED AS PART OF THE RADIOLOGICALGROUNDWATER PROTECTION PROGRAM, THREE MILE ISLAND NUCLEAR STATION, 2021 COLLECTION SITE DATE Sr-89 Sr-90 48S 02/23/21

< 183 48S 05/25/21

< 183

< 6.4

< 0.9 48S 08/05/21

< 189 48S 11/17/21

< 195 MS-1 05/12/21

< 180 MS-2 02/23/21 213 +/- 119 MS-2 05/13/21

< 188

< 8.4

< 0.8 MS-2 08/04/21

< 193 MS-2 11/11/21 190 +/- 116 MS-3 02/23/21 184 +/- 118 MS-3 05/13/21 238 +/- 126

< 6.9

< 0.9 MS-3 08/04/21

< 196 MS-3 11/11/21

< 182 MS-4 05/13/21 189 +/- 122 MS-4 11/11/21

< 187 MS-5 02/23/21

< 180 MS-5 05/13/21

< 186

< 7.4

< 0.8 MS-5 08/04/21

< 187 MS-5 11/11/21

< 196 MS-7 02/16/21

< 180 MS-7 05/12/21

< 181

< 7.6

< 1.0 MS-7 05/12/21 DUP

< 183

< 8.5

< 0.9 MS-7 08/04/21

< 197 MS-7 11/09/21

< 194 MS-8 02/23/21 305 +/- 122 MS-8 05/13/21 240 +/- 123

< 9.1

< 0.9 MS-8 08/04/21 246 +/- 130 MS-8 11/11/21

< 175 MS-20 02/23/21 466 +/- 131 MS-20 05/13/21 406 +/- 132

< 8.1

< 0.8 MS-20 08/04/21 293 +/- 132 MS-20 08/04/21 DUP 286 +/- 130 MS-20 11/11/21 420 +/- 135 MS-21 02/23/21

< 183 MS-21 05/13/21

< 184

< 6.3

< 0.9 MS-21 08/04/21 215 +/- 128 MS-21 11/11/21

< 198 MS-22 02/25/21 1140 +/- 180 MS-22 06/02/21 1180 +/- 192

< 7.3

< 1.0 MS-22 08/04/21 1260 +/- 192 MS-22 11/10/21 847 +/- 155 MW-1 05/12/21

< 174 MW-2 05/12/21

< 180 MW-TMI-1D 05/12/21

< 175 MW-TMI-2D 05/12/21

< 187 MW-TMI-2D 05/12/21 DUP

< 199 MW-TMI-3I 02/23/21 404 +/- 127 MW-TMI-3I 05/12/21 328 +/- 123

< 9.1

< 1.0 MW-TMI-3I 08/03/21

< 197 MW-TMI-3I 11/10/21

< 189 MW-TMI-4I 05/13/21

< 181 MW-TMI-4S 05/13/21

< 184 CONCENTRATIONS OF TRITIUM AND STRONTIUM IN GROUNDWATER SAMPLES H-3 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA B-1

TABLE B-I.1 COLLECTED AS PART OF THE RADIOLOGICALGROUNDWATER PROTECTION PROGRAM, THREE MILE ISLAND NUCLEAR STATION, 2021 COLLECTION SITE DATE Sr-89 Sr-90 CONCENTRATIONS OF TRITIUM AND STRONTIUM IN GROUNDWATER SAMPLES H-3 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA MW-TMI-6D 02/16/21

< 183 MW-TMI-6D 02/16/21 DUP

< 186 MW-TMI-6D 05/12/21 226 +/- 129

< 7.6

< 1.0 MW-TMI-6D 08/03/21 250 +/- 122 MW-TMI-6D 11/09/21 195 +/- 120 MW-TMI-6D 11/09/21 DUP 222 +/- 124 MW-TMI-6I 02/16/21

< 180 MW-TMI-6I 02/16/21 DUP

< 183 MW-TMI-6I 05/12/21

< 160

< 7.0

< 0.9 MW-TMI-6I 08/03/21

< 198 MW-TMI-6I 08/03/21 DUP

< 169 MW-TMI-6I 11/09/21

< 179 MW-TMI-7S 05/12/21

< 180 MW-TMI-8S 05/12/21

< 187 MW-TMI-8S 05/12/21 DUP

< 186 MW-TMI-9I 05/12/21

< 180 MW-TMI-9S 05/12/21

< 181 MW-TMI-10D 05/12/21

< 183 MW-TMI-10D 05/12/21 DUP

< 186 MW-TMI-10I 05/12/21 408 +/- 128 MW-TMI-10I 11/09/21 600 +/- 142 MW-TMI-10S 05/12/21 245 +/- 122 MW-TMI-10S 11/09/21 334 +/- 116 MW-TMI-12S 02/23/21

< 180 MW-TMI-12S 05/13/21

< 186

< 7.9

< 0.8 MW-TMI-12S 08/04/21

< 189 MW-TMI-12S 11/11/21

< 193 MW-TMI-13I 05/11/21 205 +/- 122 MW-TMI-13I 11/10/21

< 196 MW-TMI-13I 11/10/21 DUP 256 +/- 125 MW-TMI-14D 05/11/21 210 +/- 125 MW-TMI-14D 05/11/21 DUP

< 188 MW-TMI-14D 11/10/21 244 +/- 124 MW-TMI-14D 11/10/21 DUP

< 187 MW-TMI-14I 05/11/21

< 179 MW-TMI-14I 11/10/21

< 186 MW-TMI-16D 05/12/21 498 +/- 129 MW-TMI-18D 05/12/21 216 +/- 119 MW-TMI-19I 05/12/21

< 182 MW-TMI-20I 05/13/21 530 +/- 132 MW-TMI-21D 06/02/21 2170 +/- 284 MW-TMI-21D 11/10/21 2040 +/- 264 MW-TMI-21I 06/02/21 413 +/- 129 MW-TMI-21I 11/10/21 708 +/- 155 MW-TMI-21S 02/25/21 509 +/- 125 MW-TMI-21S 06/02/21 591 +/- 139

< 7.8

< 0.9 MW-TMI-21S 08/04/21 546 +/- 144 MW-TMI-21S 11/10/21 547 +/- 138 MW-TMI-22D 06/02/21 1830 +/- 250 MW-TMI-22D 11/10/21 1850 +/- 249 MW-TMI-22I 06/02/21 681 +/- 146 B-2

TABLE B-I.1 COLLECTED AS PART OF THE RADIOLOGICALGROUNDWATER PROTECTION PROGRAM, THREE MILE ISLAND NUCLEAR STATION, 2021 COLLECTION SITE DATE Sr-89 Sr-90 CONCENTRATIONS OF TRITIUM AND STRONTIUM IN GROUNDWATER SAMPLES H-3 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA MW-TMI-22I 11/10/21 656 +/- 136 MW-TMI-22S 02/25/21 454 +/- 123 MW-TMI-22S 06/02/21 516 +/- 132

< 8.9

< 1.0 MW-TMI-22S 08/04/21 556 +/- 142 MW-TMI-22S 11/10/21 432 +/- 119 NW-A 05/26/21 237 +/- 127 NW-A 11/17/21 181 +/- 115 NW-B 02/25/21 327 +/- 129 NW-B 05/26/21

< 185

< 9.2

< 0.9 NW-B 08/05/21

< 192 NW-B 11/17/21 317 +/- 124 NW-C 05/26/21 412 +/- 133 NW-C 11/17/21 503 +/- 134 OS-14 02/23/21

< 179 OS-14 05/13/21

< 183

< 8.2

< 0.9 OS-14 08/04/21

< 188 OS-14 11/11/21

< 187 OS-16 02/23/21 210 +/- 119 OS-16 05/13/21 277 +/- 123

< 6.8

< 0.9 OS-16 08/04/21

< 190 OS-16 11/11/21

< 190 OS-18 05/12/21 243 +/- 130 OSF 02/23/21 342 +/- 125 OSF 05/25/21

< 187

< 7.2

< 0.9 OSF 08/05/21 240 +/- 127 OSF 11/17/21 315 +/- 124 RW-1 02/23/21

< 183 RW-1 05/13/21

< 187

< 5.7

< 0.9 RW-1 08/04/21

< 187 RW-1 11/11/21

< 178 B-3

TABLE B-I.2 No samples collected or analyzed for gamma nuclides in 2021 CONCENTRATIONS OF GAMMA EMITTERS IN GROUNDWATER SAMPLES COLLECTED IN THE VICINITY OF THREE MILE ISLAND NUCLEAR STATION, 2021 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA B-4

TABLE B-I.3 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 48S 11/17/21

< 184

< 3.8 MS-2 11/11/21

< 160

< 4.1 MS-3 05/13/21

< 162

< 4.5 MS-5 05/13/21

< 94

< 4.5 MS-7 11/09/21

< 149

< 4.3 MS-8 05/13/21

< 158

< 5.0 MS-20 11/11/21

< 191

< 4.4 MS-21 11/11/21

< 177

< 3.5 MS-22 11/10/21

< 127

< 3.7 MW-TMI-3I 11/10/21

< 194

< 4.6 MW-TMI-6D 05/12/21

< 43

< 4.2 MW-TMI-6I 05/12/21

< 160

< 4 MW-TMI-12S 11/11/21

< 94

< 4.2 MW-TMI-21S 11/10/21

< 162

< 4.3 MW-TMI-22S 11/10/21

< 99

< 4.8 NW-B 11/17/21

< 146

< 4.8 OS-14 05/13/21

< 151

< 3.9 OS-16 05/13/21

< 107

< 4.8 OSF 11/17/21

< 55

< 3.9 RW-1 11/11/21

< 167

< 4.1 CONCENTRATIONS OF HARD-TO-DETECTS IN GROUNDWATER SAMPLES COLLECTED AS PART OF THE RADIOLOGICAL GROUNDWATER PROTECTION PROGRAM, THREE MILE ISLAND NUCLEAR STATION, 2021 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA B-5

TABLE B-II.1 PROTECTION PROGRAM, THREE MILE ISLAND NUCLEAR STATION, 2021 COLLECTION SITE DATES EDCB 01/28/21 - 04/01/21 193 +/- 120 EDCB 04/29/21 - 07/01/21 188 +/- 114 EDCB 07/29/21 - 09/30/21

< 193 EDCB 10/28/21 - 12/29/21

< 185 CONCENTRATIONS OF TRITIUM IN STORM WATER SAMPLES COLLECTED AS PART OF THE RADIOLOGICAL GROUNDWATER RESULTS IN UNITS OF PCI/LITER + 2 SIGMA H-3 B-6

TABLE B-II.2 COLLECTION SITE DATES Be-7 K-40 Mn-54 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 La-140 EDCB 01/28/21 - 04/01/21

< 29

< 34

< 3

< 3

< 6

< 4

< 6

< 4

< 5

< 4

< 3

< 15

< 5 EDCB 04/29/21 - 07/01/21

< 22

< 50

< 3

< 2

< 5

< 2

< 5

< 3

< 4

< 3

< 3

< 12

< 3 EDCB 07/29/21 - 09/30/21

< 14

< 15

< 2

< 2

< 4

< 2

< 3

< 2

< 3

< 2

< 2

< 8

< 3 EDCB 10/28/21 - 12/29/21

< 15

< 17

< 2

< 2

< 4

< 2

< 3

< 2

< 3

< 2

< 2

< 8

< 3 Co-58 Ba-140 Cs-134 Cs-137 CONCENTRATIONS OF GAMMA EMITTERS IN STORM WATER SAMPLES COLLECTED IN THE VICINITY OF THREE MILE ISLAND NUCLEAR STATION, 2021 RESULTS IN UNITS OF PCI/LITER + 2 SIGMA B-7

TABLE B-III.1 COLLECTION SITE DATE H-3 TM-PR-EDCB 02/16/21 263 +/- 121 TM-PR-EDCB 06/23/21

< 184 TM-PR-EDCB 09/24/21

< 177 TM-PR-EDCB 12/15/21

< 156 TM-PR-ESE 02/16/21 819 +/- 155 TM-PR-ESE 06/23/21 199 +/- 120 TM-PR-ESE 08/03/21

< 182 TM-PR-ESE 11/09/21

< 172 TM-PR-MS-1 02/16/21

< 176 TM-PR-MS-1 06/23/21

< 182 TM-PR-MS-1 08/03/21

< 184 TM-PR-MS-1 11/09/21

< 162 TM-PR-MS-2 02/16/21 797 +/- 154 TM-PR-MS-2 06/23/21 302 +/- 125 TM-PR-MS-2 08/03/21

< 183 TM-PR-MS-2 11/09/21

< 163 TM-PR-MS-4 02/16/21 306 +/- 127 TM-PR-MS-4 06/23/21 207 +/- 120 TM-PR-MS-4 08/03/21

< 182 TM-PR-MS-4 11/09/21

< 155 TM-PR-MS-8 02/16/21

< 182 TM-PR-MS-8 06/23/21

< 182 TM-PR-MS-8 08/03/21

< 193 TM-PR-MS-8 11/09/21

< 152 TM-PR-MW-22S 02/16/21 676 +/- 142 TM-PR-MW-22S 06/23/21 384 +/- 129 TM-PR-MW-22S 08/03/21

< 182 TM-PR-MW-22S 11/09/21 226 +/- 112 TM-PR-RW-1 02/16/21

< 182 TM-PR-RW-1 06/23/21

< 184 TM-PR-RW-1 08/03/21

< 179 TM-PR-RW-1 11/09/21

< 149 CONCENTRATIONS OF TRITIUM IN PRECIPITATION WATER SAMPLES COLLECTED AS PART OF THE RADIOLOGICAL GROUNDWATER PROTECTION PROGRAM, THREE MILE ISLAND NUCLEAR STATION, 2021 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA B-8

APPENDIX C DATA TABLES COMPARISON LAB

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TABLE C-I.1 COLLECTION LAB SITE DATE H-3 Sr-89 Sr-90 GEL MS-7 05/12/21

< 134

< 1.3

< 0.8 MS-20 08/04/21 222 +/- 91 MW-TMI-2D 05/12/21

< 131 MW-TMI-6D 02/16/21 161 +/- 85 MW-TMI-6D 11/19/21 184 +/- 89 MW-TMI-6I 02/16/21 188 +/- 86 MW-TMI-6I 08/03/21 157 +/- 83 MW-TMI-8S 05/12/21 143 +/- 94 MW-TMI-10D 05/12/21 145 +/- 95 MW-TMI-13I 11/10/21

< 125 MW-TMI-14D 05/11/21 231 +/- 98 MW-TMI-14I 11/10/21 224 +/- 94 CONCENTRATIONS OF TRITIUM AND STRONTIUM IN GROUNDWATER SPLIT SAMPLES COLLECTED AS PART OF THE RADIOLOGICAL GROUNDWATER PROTECTION PROGRAM, THREE MILE ISLAND NUCLEAR STATION, 2021 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA C-1

TABLE C-I.2 No samples collected or analyzed for gamma nuclides in 2021 CONCENTRATIONS OF GAMMA EMITTERS IN GROUNDWATER SPLIT SAMPLES COLLECTED AS PART OF THE RADIOLOGICAL GROUNDWATER PROTECTION PROGRAM, THREE MILE ISLAND NUCLEAR STATION, 2021 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA C-2

TABLE C-I.3 No samples collected or analyzed for hard to detects in 2021 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA CONCENTRATIONS OF HARD-TO-DETECTS IN GROUNDWATER SPLIT SAMPLES COLLECTED AS PART OF THE RADIOLOGICAL GROUNDWATER PROTECTION PROGRAM, THREE MILE ISLAND NUCLEAR STATION, 2021 C-3

TABLE C-II.1 CONCENTRATIONS OF TRITIUM IN PRECIPITATION WATER SPLIT SAMPLES COLLECTED AS PART OF THE RADIOLOGICAL GROUNDWATER PROTECTION COLLECTION LAB SITE DATE H-3 GEL TM-PR-MS-2Q 02/16/21 747 +/- 127 06/23/21 296 +/- 92 08/03/21

< 114 11/09/21

< 122 PROGRAM, THREE MILE ISLAND NUCLEAR STATION, 2021 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA C-4