Text

2020 Annual Radiological Environmental Operating Report
	ML21321A274
Person / Time
Site:	Dresden
Issue date:	05/06/2021
From:	Karaba P; Exelon Generation Co
To:	; Document Control Desk, Office of Nuclear Material Safety and Safeguards, Office of Nuclear Reactor Regulation
References
	SVPLTR# 21-0028
	Download: ML21321A274 (111)
	v • d • e

Exelon Generation May 6, 2021 SVPLTR# 21-0028 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555-0001 Dresden Nuclear Power Station Units 1, 2, and 3 Facility Operation License No. DPR-2 Dresden '\\uclear Pim er Station 6500 i\\orth Dr.;:sd~n Road l\\1orri\\. II 60-150 815-942-2920 rckphunc 111111 exdon..:,1rp com Renewed Facility Operating License Nos. DPR-19 and DPR-25 NRC Docket Nos.50-010. 50-237. and 50-249

Subject:

Dresden Nuclear Power Station 2020 Annual Radiological Environmental Operating Report Enclosed is the Exelon Dresden Nuclear Power Station 2020 Annual Radiological Environmental Operating Report, submitted in accordance with Section 6.9.A.3 of the Unit 1 Dresden Nuclear Power Station Technical Specifications and Section 5.6.2, "Annual Radiological Environmental Operation Report," of the Units 2 and 3 Technical Specifications.

This report provides the results of the radiological environmental monitoring program for the 2020 calendar year.

In addition, Appendix F of the report contains the results of groundwater monitoring conducted in accordance with Exelon's Radiological Groundwater Protection Program, which is a voluntary program implemented in 2006. This information is being reported in accordance with a nuclear industry initiative.

Should you have any questions concerning this letter, please contact DJ Walker, Regulatory Assurance Department, at (815) 416-2812.

Peter J. Karaba Site Vice President Dresden Nuclear Power Station 020 Annual Radiological Environmental Operating Report

Docket No:

50-010 50-237 50-249 DRESDEN NUCLEAR POWER STATION UNITS 1, 2 and 3 Annual Radiological Environmental Operating Report 1 January through 31 December 2020 Prepared By Teledyne Brown Engineering Environmental Services Dresden Nuclear Power Station Morris, IL 60450 May 2020

Intentionally left blank

i Table Of Contents I. Summary and Conclusions.............................................................................................. 1 II. Introduction...................................................................................................................... 2 A. Objectives of the REMP....................................................................................... 2 B. Implementation of the Objectives........................................................................ 2 III. Program Description....................................................................................................... 3 A. Sample Collection................................................................................................ 3 B. Sample Analysis.................................................................................................. 4 C. Data Interpretation............................................................................................... 4 D. Program Exceptions............................................................................................ 5 E. Program Changes............................................................................................... 7 IV. Results and Discussion................................................................................................. 8 A. Aquatic Environment........................................................................................... 8

1. Surface Water........................................................................................... 8

2. Ground Water........................................................................................... 8

3. Fish........................................................................................................... 9

4. Sediment................................................................................................... 9 B. Atmospheric Environment................................................................................... 9

1. Airborne.................................................................................................... 9

a. Air Particulates............................................................................... 9

b. Airborne Iodine............................................................................. 10

2. Terrestrial................................................................................................ 10

a. Milk............................................................................................... 10

b. Food Products.............................................................................. 11 C. Ambient Gamma Radiation............................................................................... 11 D. Land Use Survey............................................................................................... 11 E. Errata Data........................................................................................................ 12 F. Summary of Results - Inter-laboratory Comparison Program........................... 12

ii Appendices Appendix A Radiological Environmental Monitoring Report Summary (Meets requirements of NUREG 1302)

Tables Table A-1 Radiological Environmental Monitoring Program Annual Summary for the Dresden Nuclear Power Station, 2020 Appendix B Location Designation, Distance & Direction, and Sample Collection &

Analytical Methods Tables Table B-1 Radiological Environmental Monitoring Program - Sampling Locations, Distance and Direction, Dresden Nuclear Power Station, 2020 Table B-2 Radiological Environmental Monitoring Program - Summary of Sample Collection and Analytical Methods, Dresden Nuclear Power Station, 2020 Figures Figure B-1 Dresden Station Inner Ring OSLD Locations, Fish, Water, and Sediment Locations, 2020 Figure B-2 Dresden Station Fixed Air Sampling and OSLD Sites, Outer Ring OSLD Locations and Milk Location, 2020 Appendix C Data Tables and Figures Tables Table C-I.1 Concentrations of Gross Beta in Surface Water Samples Collected in the Vicinity of Dresden Nuclear Power Station, 2020 Table C-I.2 Concentrations of Tritium in Surface Water Samples Collected in the Vicinity of Dresden Nuclear Power Station, 2020 Table C-I.3 Concentrations of Gamma Emitters in Surface Water Samples Collected in the Vicinity of Dresden Nuclear Power Station, 2020 Table C-II.1 Concentrations of Tritium in Ground Water Samples Collected in the Vicinity of Dresden Nuclear Power Station, 2020 Table C-II.2 Concentrations of Gamma Emitters in Ground Water Samples Collected in the Vicinity of Dresden Nuclear Power Station, 2020

iii Table C-III.1 Concentrations of Gamma Emitters in Fish Samples Collected in the Vicinity of Dresden Nuclear Power Station, 2020 Table C-IV.1 Concentrations of Gamma Emitters in Sediment Samples Collected in the Vicinity of Dresden Nuclear Power Station, 2020 Table C-V.1 Concentrations of Gross Beta in Air Particulate Samples Collected in the Vicinity of Dresden Nuclear Power Station, 2020 Table C-V.2 Monthly and Yearly Mean Values of Gross Beta Concentrations in Air Particulate Samples Collected in the Vicinity of Dresden Nuclear Power Station, 2020 Table C-V.3 Concentrations of Gamma Emitters in Air Particulate Samples Collected in the Vicinity of Dresden Nuclear Power Station, 2020 Table C-VI.1 Concentrations of I-131 in Air Iodine Samples Collected in the Vicinity of Dresden Nuclear Power Station, 2020 Table C-VII.1 Concentrations of I-131 in Milk Samples Collected in the Vicinity of Dresden Nuclear Power Station, 2020 Table C-VII.2 Concentrations of Gamma Emitters in Milk Samples Collected in the Vicinity of Dresden Nuclear Power Station, 2020 Table C-VIII.1 Concentrations of Gamma Emitters in Vegetation Samples Collected in the Vicinity of Dresden Nuclear Power Station, 2020 Table C-IX.1 Quarterly DLR Results for Dresden Nuclear Power Station, 2020 Figures Figure C-1 Surface Water - Gross Beta - Station D-52 (C) Collected in the Vicinity of DNPS, 2000 - 2020 Figure C-2 Surface Water - Gross Beta - Station D-57 (C) Collected in the Vicinity of DNPS, 2006 - 2020 Figure C-3 Surface Water - Gross Beta - Station D-21 Collected in the Vicinity of DNPS, 2000 - 2020 Figure C-4 Surface Water - Tritium - Station D-52 (C) Collected in the Vicinity of DNPS, 2000 - 2020 Figure C-5 Surface Water - Tritium - Station D-57 (C) Collected in the Vicinity of DNPS, 2006 - 2020 Figure C-6 Surface Water - Tritium - Station D-21 Collected in the Vicinity of DNPS, 2007 - 2020 Figure C-7 Ground Water - Tritium - Stations D-23 and D-35 Collected in the Vicinity of DNPS, 2000 - 2020 Figure C-8 Ground Water - Tritium - Stations D-22 and D-24 Collected in the Vicinity of DNPS, 2020

iv Figure C-9 Air Particulate - Gross Beta - Stations D-01 and D-02 Collected in the Vicinity of DNPS, 2000 - 2020 Figure C-10 Air Particulate - Gross Beta - Stations D-03 and D-04 Collected in the Vicinity of DNPS, 2000 - 2020 Figure C-11 Air Particulate - Gross Beta - Stations D-07 and D-12 (C) Collected in the Vicinity of DNPS, 2000 - 2020 Figure C-12 Air Particulate - Gross Beta - Stations D-45 and D-53 Collected in the Vicinity of DNPS, 2000 - 2020 Figure C-13 Air Particulate - Gross Beta - Stations D-08 and D-10 Collected in the Vicinity of DNPS, 2005 - 2020 Figure C-14 Air Particulate - Gross Beta - Station D-14 Collected in the Vicinity of DNPS, 2005 - 2020 Figure C-15 Air Particulate - Gross Beta - Stations D-55 and D-56 Collected in the Vicinity of DNPS, 2006 - 2020 Figure C-16 Air Particulate - Gross Beta - Station D-58 Collected in the Vicinity of DNPS, 2011 - 2020 Appendix D Inter-Laboratory Comparison Program Tables Table D-1 Analytics Environmental Radioactivity Cross Check Program Teledyne Brown Engineering, 2020 Table D-2 DOEs Mixed Analyte Performance Evaluation Program (MAPEP)

Teledyne Brown Engineering, 2020 Table D-3 ERA Environmental Radioactivity Cross Check Program Teledyne Brown Engineering, 2020 Appendix E Errata Data Appendix F Annual Radiological Groundwater Protection Program Report (ARGPPR)

1 I.

Summary and Conclusions In 2020, the Dresden Nuclear Power Station calculated a Total Body dose to the nearest resident of 7.40E+00 mRem/yr from all sources of the uranium fuel cycle with a limit of 25 mRem/yr, which is 29.6% of the limit. Dose contributions were from Unit 1, operation of Units 2 and 3, storage tanks, Independent Spent Fuel Storage Installation (ISFSI) pads, C-14, and the neighboring GE Facility. More detailed information can be found in the Dresden 2020 Annual Radioactive Effluent Release Report.

Surface water samples were analyzed for concentrations of gross beta, tritium and gamma emitting nuclides. Ground water samples were analyzed for concentrations of tritium (H-3) and gamma emitting nuclides. No anthropogenic gamma-emitting nuclides were detected. Gross beta and tritium activities detected were consistent with those detected in previous years.

Fish (commercially and recreationally important species), and sediment samples were analyzed for concentrations of gamma-emitting nuclides. No fission or activation products were detected.

Air particulate samples were analyzed for concentrations of gross beta and gamma-emitting nuclides. Gross beta results at the indicator locations were consistent with those at the control location. No fission or activation products were detected.

High sensitivity iodine-131 (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 and gamma-emitting nuclides. All I-131 results were less than the minimum detectable activity. No fission or activation products were detected. Food product samples were analyzed for concentrations of gamma-emitting nuclides.

No fission or activation products were detected.

Environmental gamma radiation measurements were performed quarterly using Optically Stimulated Luminescent Dosimetry (OSLD). The relative comparison to control locations remains valid.

This report on the Radiological Environmental Monitoring Program conducted for the Dresden Nuclear Power Station (DNPS) of Exelon Generation, LLC covers the period 1 January 2020 through 31 December 2020. During that time period 1,911 analyses were performed on 1,775 samples. In assessing all the data gathered for this report it was concluded that the operation of DNPS had no adverse radiological impact on the environment.

2 II.

Introduction The Dresden Nuclear Power Station (DNPS), consisting of one retired reactor and two operating boiling water reactors owned and operated by Exelon Generation, LLC, is located in Grundy County, Illinois. Unit No. 1 went critical in 1960 and was retired in 1978. Unit No. 2 went critical on 16 June 1970. Unit No.

3 went critical on 02 November 1971. The site is located in northern Illinois, approximately 12 miles southwest of Joliet, Illinois at the confluence of the Des Plaines and Kankakee Rivers where they form the Illinois River.

This report covers those analyses performed by Teledyne Brown Engineering (TBE) and Landauer on samples collected during the period 1 January 2020 through 31 December 2020.

An assessment of the stations radioactive effluent monitoring results and radiation dose via the principle pathways of exposure resulting from plant emissions of radioactivity including the maximum noble gas gamma and beta air doses in the unrestricted area, an annual summary of meteorological conditions including wind speed, wind direction and atmospheric stability and the result of the 40CFR190 uranium fuel cycle dose analysis for the calendar year are published in the stations Annual Radioactive Effluent Release Report.

A.

Objective of the Radiological Environmental Monitoring Program (REMP)

The objectives of the REMP are to:

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

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

B.

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

1. Identifying significant exposure pathways;

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

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

3 III.

Program Description A.

Sample Collection Samples for the DNPS REMP were collected for Exelon Generation, LLC by Environmental Incorporated Midwest Laboratory (EIML). This section describes the general collection methods used by EIML to obtain environmental samples for the DNPS REMP in 2020. Sample locations and descriptions can be found in Appendix B, Table B-1 and Figures B-1 and B-2. The collection methods used by EIML are listed in Table B-2.

Aquatic Environment The aquatic environment was evaluated by performing radiological analyses on samples of surface water (SW), ground water (GW), fish (FI) and sediment (SS). Samples were collected from three surface water locations (D-21, D-52 and D-57) and composited for analysis. Control locations were D-52 and D-57. Samples were collected quarterly from three well water locations (D-23, D-24 and D-35). A single sample from well D-22 was taken in January 2020. All samples were collected in new unused plastic bottles, which were rinsed with source water prior to collection. Fish samples comprising the flesh of largemouth bass, smallmouth bass, smallmouth buffalo, common carp and channel catfish were collected semiannually at two locations, D-28 and D-46 (Control).

Sediment samples composed of recently deposited substrate were collected at one location semiannually, D-27.

Atmospheric Environment The atmospheric environment was evaluated by performing radiological analyses on samples of air particulate and airborne iodine (AP/AI).

Airborne iodine and particulate samples were collected at fourteen locations (D-01, D-02, D-03, D-04, D-07, D-08, D-10, D-12, D-14, D-45, D-53, D-55, D-56 and D-58). The control location was D-12. 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 air filters and air iodine samples were replaced weekly and sent to the laboratory for analysis.

Terrestrial Environment Milk (M) samples are typically collected biweekly at one control location (D-25) from May through October and monthly from November through April. Other than D-25, there are no additional milking animals within 10 km (6.2 miles) of the site. All milk samples from D-25 were collected in new unused two gallon plastic bottles from the bulk tank, preserved with sodium bisulfite and shipped promptly to the laboratory. Food products (FL) were collected July through October at six locations (D-25, D-40,

4 D-41, D-42, D-43 and D-44). The control location was D-25. Various types of broadleaf vegetation samples were collected and placed in new unused plastic bags and sent to the laboratory for analysis.

Ambient Gamma Radiation Each location consisted of two OSLD sets. The OSLD locations were placed on and around the DNPS site as follows:

An inner ring consisting of 17 locations (D-58, D-101, D-102, D-103, D-104, D-105, D-106, D-107, D-108, D-109, D-110, D-111, D-112a, D-113, D-114, D-115 and D-116) at or near the site boundary.

An outer ring consisting of 16 locations (D-201, D-202, D-203, D-204, D-205, D-206, D-207, D-208, D-209, D-210, D-211, D-212, D-213, D-214, D-215 and D-216) approximately 5 to 10 km (3.1 to 6.2 miles) from the site.

Other locations consisting of OSLD sets at the 13 air sampler locations (D-01, D-02, D-03, D-04, D-07, D-08, D-10, D-14, D-45, D-53, D-55, D-56 and D-58).

The balance of one location (D-12) represents the control area OSLD set.

The OSLDs were exchanged quarterly and sent to Landauer for analysis.

B.

Sample Analysis This section describes the general analytical methodologies used by TBE to analyze the environmental samples for radioactivity for the DNPS REMP in 2020. The analytical procedures used by the laboratory are listed in Appendix B Table B-2.

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

1. Concentrations of beta emitters in surface water and air particulates.

2. Concentrations of gamma emitters in ground and surface water, air particulates, milk, fish, sediment and vegetation.

3. Concentrations of tritium in ground and surface water.

4. Concentrations of I-131 in air and milk.

5. Ambient gamma radiation levels at various site environs.

C.

Data Interpretation For the purpose of this report, Dresden Nuclear Power Station was considered operational at initial criticality. In addition, data were compared to previous years' operational data for consistency and trending. Several factors were important in the interpretation of the data:

5

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 DNPS detection capabilities for environmental sample analysis.

The minimum detectable concentration (MDC) is calculated the same as the LLD 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 effecting 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 groundwater, surface water, and vegetation twelve nuclides, Mn-54, Co-58, Fe-59, Co-60, Zn-65, Nb-95, Zr-95, I-131, Cs-134, Cs-137, Ba-140 and La-140 were reported.

For fish, sediment, air particulate and milk eleven nuclides, 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.

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 2020 the DNPS REMP had a sample recovery rate greater than 99%

(1,775 of 1,785 samples collected). Sample anomalies and missed samples are listed in the following tables:

6 Table D-1 LISTING OF SAMPLE ANOMALIES Sample Type Location Code Collection Date Reason AP/AI D-12 04/17/20 Lower reading of 89.08 hrs. ComEd crew working at the station. LLD sample met.

AP/AI D-03 10/09/20 Low reading of 67.56 hrs; pump found not running; crews working to restore power.

AP/AI D-03 10/16/20 No power at this station due to power supply malfunction.

AP/AI D-03 10/23/20 Lower reading of 104.2 hrs caused by power malfunction earlier in the week. It was discovered during troubleshooting that the power surge weeks before blew the fuse on the pump. The pump was replaced midweek.

AP/AI D-53 10/30/20 No sample; power surge burned the fuse. Pump was exchanged and surge protectors were installed on all air sampling stations.

AP/AI D-02 10/02/20 Hose detached possibly due to vibrations. Filter discarded, all couplings checked and reinforced.

Table D-2 LISTING OF ODCM REQUIRED MISSED SAMPLES There were no missed ODCM-required samples in 2020 Each program exception was reviewed to understand the causes of the program exception. No sampling or maintenance errors were identified during the reporting period. 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 There were no program changes in 2020.

7 IV.

Results and Discussion A.

Aquatic Environment 1.

Surface Water Samples were composited or taken weekly and composited for analysis at three locations (D-21, D-52 and D-57). Of these locations only D-21, located downstream, could be affected by Dresdens effluent releases. The following analyses were performed:

Gross Beta Monthly composites from all locations were analyzed for concentrations of gross beta (Table C-I.1, Appendix C). Gross Beta was detected in 35 of 36 samples. The values ranged from 3.6 to 15.5 pCi/l. Concentrations detected were consistent with those detected in previous years. (Figures C-1, C-2 and C-3, Appendix C)

Tritium Quarterly composites from all locations were analyzed for tritium activity (Table C-I.2, Appendix C). Three samples at indicator station D-21 were positive for tritium with concentrations ranging between 232 and 273 pCi/L. Two samples at control station D-57 were positive for tritium with concentrations of 268 to 362 pCi/L. No samples from station D-52 were positive for tritium. Concentrations detected were consistent with those detected in previous years.

(Figures C-4, C-5 and C-6, Appendix C)

Gamma Spectrometry Monthly composites from all locations were analyzed for gamma-emitting nuclides. No nuclides were detected and all required LLDs were met. (Table C-I.3, Appendix C) 2.

Ground Water Quarterly grab samples were collected at locations D-22, D-24 and D-

35. A single sample was collected at location D-23 in January. These locations could be affected by Dresdens effluent releases and by sources upstream on the Kankakee River. The following analyses were performed:

Tritium All were analyzed for tritium activity (Table C-II.1, Appendix C).

Tritium was not detected in any sample. Results were consistent with those in previous years. (Figure C-7, Appendix C)

8 Gamma Spectrometry All samples were analyzed for gamma-emitting nuclides. No nuclides were detected and all required LLDs were met.

(Table C-II.2, Appendix C)

3. Fish Fish samples comprised of largemouth bass, smallmouth bass, smallmouth buffalo, common carp and channel catfish were collected at two locations (D-28 and D-46) semiannually. Location D-28 could be affected by Dresdens effluent releases. The following analysis was performed:

Gamma Spectrometry The edible portion of fish samples from both locations was analyzed for gamma-emitting nuclides (Table C-III.1, Appendix C). Only naturally-occurring nuclides (not shown on tables) were found at both locations. No fission or activation products were detected.

4. Sediment Aquatic sediment samples were collected at one location (D-27) semiannually. This downstream location could be affected by Dresdens effluent releases. The following analysis was performed:

Gamma Spectrometry Sediment samples from the location were analyzed for gamma-emitting nuclides (Table C-IV.1, Appendix C). No fission or activation products were detected.

B.

Atmospheric Environment

1. Airborne

a.

Air Particulates Continuous air particulate samples were collected from fourteen locations on a weekly basis. The fourteen locations were separated into four groups: On-site samplers (D-01, D-02 and D-03), Near-field samplers within 3.1 miles of the site (D-04, D-07, D-45, D-53, D-56 and D-58), Far-field samplers between 5 and 10 km (3.1 and 6.2 miles) from the site (D-08, D-10, D-14 and D-55) and the Control sampler between 10 and 30 km (6.2 and 18.6 miles) from the site (D-12). The following analyses were performed:

Gross Beta Weekly samples were analyzed for concentrations of beta emitters. (Table C-V.1 and C-V.2, Appendix C)

9 Detectable gross beta activity was observed at all locations.

Comparison of results among the four groups aid in determining the effects, if any, resulting from the operation of DNPS. The results from the On-Site locations ranged from 7.0E-3 to 4.3E-2 pCi/m3 with a mean of 1.8E-2 pCi/m3. The results from the Near-Field locations ranged from 6.0E-3 to 3.9E-2 pCi/m3 with a mean of 1.7E-2 pCi/m3. The results from the Far-Field locations ranged from 5.0E-3 to 4.2E-2 pCi/m3 with a mean of 1.7E-2 pCi/m3. The results from the Control location ranged from 7.3E-3 to 3.9E-2 pCi/m3 with a mean of 1.8E-2 pCi/m3. Comparison of the 2020 air particulate data with previous years data indicate no effects from the operation of DNPS. In addition a comparison of the weekly mean values for 2020 indicate no notable differences among the four groups. (Figures C-8 through C-14, Appendix C)

Gamma Spectrometry Samples were composited quarterly and analyzed for gamma emitting nuclides (Table C-V.3, Appendix C). Only naturally-occurring nuclides (not shown on the tables) were found in these composite samples. No anthropogenic nuclides were detected and all required LLDs were met. These samples were consistent with historical quarterly results. All other nuclides were less than the MDC.

b. Airborne Iodine Continuous air samples were collected from fourteen locations (D-01, D-02, D-03, D-04, D-07, D-08, D-10, D-12, D-14, D-45, D-53, D-55, D-56 and D-58) and analyzed weekly for I-131. All results were less than the MDC for I-131.

(Table C-VI.1, Appendix C)

2. Terrestrial

a. Milk Milk (M) samples are typically collected biweekly at one control location (D-25) from May through October and monthly from November through April. Other than D-25, there are no additional milking animals within 10 kilometers (6.2 miles) of the site. The following analyses were performed:

Iodine-131 Milk samples from location D-25 were analyzed for concentrations of I-131. No I-131 was detected and the LLD was met.

(Table C-VII.1, Appendix C)

10 Gamma Spectrometry Milk samples from location D-25 were analyzed for concentrations of gamma emitting nuclides. Only naturally-occurring nuclides (not shown on the tables) were found in all samples. No other gamma emitting nuclides were detected and all required LLDs were met. (Table C-VII.2, Appendix C)

b. Food Products Food product samples were collected at six locations (D-25, D-40, D-41, D-42 D-43 and D-44) when available. The Control location is D-25 and the other 5 locations could be affected by Dresdens effluent releases. The following analysis was performed:

Gamma Spectrometry Samples from six locations were analyzed for gamma-emitting nuclides. No nuclides were detected and all required LLDs were met. (Table C-VIII.1, Appendix C)

C.

Ambient Gamma Radiation Forty-six OSLD locations were established around the site. Results of OSLD measurements are listed in Table C-IX.1, Appendix C.

Most OSLD measurements were below 28 mrem/quarter, with a range of 10.4 to 27.8 mrem/quarter. A comparison of the Inner Ring, Outer Ring and Other locations data to the Control Location data, indicate that the ambient gamma radiation levels from the Control location (D-12) were comparable.

D.

Land Use Survey A Land Use Survey conducted on August 22, 2020 around the Dresden Nuclear Power Station (DNPS) was performed by EIML for Exelon Generation, LLC to comply with Section 12.6.2 of the Dresden Offsite Dose Calculation Manual (ODCM). The purpose of the survey was to document the nearest resident or industrial facility, milk producing animal, and livestock in each of the sixteen 22 1/2 degree sectors within 10 km (6.2 miles) around the site. There were no changes required to the DNPS REMP as a result of this survey. The results are summarized as follows:

11 Distance in Miles from the DNPS Reactor Buildings Sector Residence Miles Livestock Miles Milk Farm Miles A

N 1.5 1.4 B

NNE 0.8 C

NE 0.8 5.8 D

ENE 0.7 1.7 E

E 1.1 F

ESE 1.0 G

SE 0.6 H

SSE 0.5 J

S 0.5 K

SSW 3.3 L

SW 3.6 11.4 M

WSW 5.9 N

W 3.5 0.5 P

WNW 3.2 0.5 Q

NW 2.2 0.5 R

NNW 0.8 1.0 E.

Errata Data There was no errata data in 2020.

F.

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

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

A.

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

B.

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

12 the Generation of Performance Acceptance Limits, as applicable.

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

C.

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

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

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

to +/- 30% of the reference value

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

For the TBE laboratory, 126 out of 133 analyses performed met the specified acceptance criteria. Seven analyses did not meet the specified acceptance criteria for the following reasons and were addressed through the TBE Corrective Action Program. A summary is found below:

1.

The MAPEP February 2020 AP U-233/234 and U-238 results were evaluated as Not Acceptable. The reported value for U-233/234 was 0.0416

+/- 0.0102 Bq/sample and the known result was 0.075 Bq/sample (acceptance range 0.053 - 0.098). The reported value for U-238 was 0.0388 +/- 0.00991 Bq/sample and the known result was 0.078 Bq/sample (acceptance range 0.055 - 0.101). This sample was run as the workgroup duplicate and had RPDs of 10.4% (U-234) and 11.7% (U-238). After the known results were obtained, the sample was relogged. The filter was completely digested with tracer added originally; the R1 results were almost identical. It was concluded that the recorded tracer amount was actually double, causing the results to be skewed. Lab worksheets have been modified to verify actual tracer amount vs. LIMS data. TBE changed vendors for this cross-check to ERA MRAD during the 2nd half of 2020.

Results were acceptable at 97.8% for U-234 and 106% for U-238.

(NCR 20-13)

2.

The Analytics September 2020 milk Sr-89 result was evaluated as Not Acceptable. The reported value was 62.8 pCi/L and the known result was

13 95.4 (66%). All QC data was reviewed and there were no anomalies. This was the first failure for milk Sr-89 since 2013 and there have only been 3 upper/lower boundary warnings since that time. It is believed that there may have been some Sr-89 loss during sample prep. The December 2020 result was at 92% of the known. (NCR 20-19)

3.

The ERA October 2020 water I-131 result was evaluated as Not Acceptable.

The reported value was 22.9 pCi/L and the known result was 28.2 (acceptance range 23.5 - 33.1). The reported result was 81% of the known, which passes TBE QC criteria. This was the first failure for water I-131.

(NCR 20-17)

4.

The ERA October 2020 water Gross Alpha and Gross Beta results were evaluated as Not Acceptable. The reported/acceptable values and ranges are as follows:

Reported Known Range Gross Alpha 40.0 26.2 13.3 - 34.7 Gross Beta 47.5 69.1 48.0 - 76.0 All QC data was reviewed with no anomalies and a cause for failure could not be determined. This was the first failure for water Gross Beta. A Quick Response follow-up cross-check was analyzed as soon as possible with acceptable results at 96.8% for Gross Alpha and 102% for Gross Beta.

(NCR 20-18)

5.

The MAPEP August 2020 soil Ni-63 result was evaluated as Not Acceptable. The reported value was 438 +/- 21.1 Bq/kg and the known result was 980 Bq/kg (acceptance range 686 - 1274). It is believed that some Ni-63 loss occurred during the sample prep step. (NCR 20-20)

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

Intentionally left blank

APPENDIX A RADIOLOGICAL ENVIRONMENTAL MONITORING REPORT

SUMMARY

Intentionally left blank

NAME OF FACILITY:

DRESDEN DOCKET NUMBER:

LOCATION OF FACILITY:

MORRIS IL REPORTING PERIOD:

2020 INDICATOR CONTROL MEDIUM OR REQUIRED LOCATIONS LOCATION NUMBER OF PATHWAY SAMPLED TYPES OF NUMBER OF LOWER LIMIT MEAN (M)

MEAN (M)

STATION #

NONROUTINE (UNIT OF ANALYSIS ANALYSIS OF DETECTION (F)

(F)

NAME REPORTED MEASUREMENT)

PERFORMED PERFORMED (LLD)

RANGE RANGE RANGE DISTANCE AND DIRECTION MEASUREMENTS SURFACE WATER GR-B 36 4

6.8 7.7 9.6 D-52 CONTROL 0

(PCI/LITER)

(12/12)

(23/24)

(12/12)

DESPLAINES RIVER AT WILL ROAD (CONTROL) 4.0 - 11.8 3.6 - 15.5 5.4 - 15.5 1.1 MILES ESE OF SITE H-3 12 2000 253 315 315 D-57 CONTROL 0

(3/4)

(2/8)

(2/4)

KANKAKEE RIVER AT WILL ROAD (CONTROL) 232 - 273 268 - 362 268 - 362 2.0 MILES SE OF SITE 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

I-131 15

<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

GROUND WATER H-3 13 2000 NA NA NA 0

(PCI/LITER)

GAMMA 13 MN-54 15

<LLD NA 0

CO-58 15

<LLD NA 0

FE-59 30

<LLD NA 0

CO-60 15

<LLD NA 0

ZN-65 30

<LLD NA 0

NB-95 15

<LLD NA 0

ZR-95 30

<LLD NA 0

I-131 15

<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

LOCATION WITH HIGHEST ANNUAL MEAN (M)

TABLE A-1 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANNUAL

SUMMARY

FOR DRESDEN NUCLEAR POWER STATION, 2020 50-010, 50-237 & 50-249 (M) The Mean Values are calculated using the positive values. (F) Fraction of detectable measurement are indicated in parentheses A-1

NAME OF FACILITY:

DRESDEN DOCKET NUMBER:

LOCATION OF FACILITY:

MORRIS IL REPORTING PERIOD:

2020 INDICATOR CONTROL MEDIUM OR REQUIRED LOCATIONS LOCATION NUMBER OF PATHWAY SAMPLED TYPES OF NUMBER OF LOWER LIMIT MEAN (M)

MEAN (M)

STATION #

NONROUTINE (UNIT OF ANALYSIS ANALYSIS OF DETECTION (F)

(F)

NAME REPORTED MEASUREMENT)

PERFORMED PERFORMED (LLD)

RANGE RANGE RANGE DISTANCE AND DIRECTION MEASUREMENTS LOCATION WITH HIGHEST ANNUAL MEAN (M)

TABLE A-1 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANNUAL

SUMMARY

FOR DRESDEN NUCLEAR POWER STATION, 2020 50-010, 50-237 & 50-249 FISH GAMMA 8

(PCI/KG WET)

MN-54 130

<LLD NA 0

CO-58 130

<LLD NA 0

FE-59 260

<LLD NA 0

CO-60 130

<LLD NA 0

ZN-65 260

<LLD NA 0

NB-95 NA

<LLD NA 0

ZR-95 NA

<LLD NA 0

CS-134 130

<LLD NA 0

CS-137 150

<LLD NA 0

BA-140 NA

<LLD NA 0

LA-140 NA

<LLD NA 0

SEDIMENT GAMMA 2

(PCI/KG DRY)

MN-54 NA

<LLD NA 0

CO-58 NA

<LLD NA 0

FE-59 NA

<LLD NA 0

CO-60 NA

<LLD NA 0

ZN-65 NA

<LLD NA 0

NB-95 NA

<LLD NA 0

ZR-95 NA

<LLD NA 0

CS-134 150

<LLD NA 0

CS-137 180

<LLD NA 0

BA-140 NA

<LLD NA 0

LA-140 NA

<LLD NA 0

AIR PARTICULATE GR-B 723 10 17 18 18 D-02 INDICATOR 0

(E-3 PCI/CU.M)

(669/671)

(52/52)

(51/51)

ONSITE 2 5 - 43 7 - 39 7 - 43 0.3 MILES NNE OF SITE GAMMA 56 MN-54 NA

<LLD

<LLD 0

CO-58 NA

<LLD

<LLD 0

FE-59 NA

<LLD

<LLD 0

CO-60 NA

<LLD

<LLD 0

ZN-65 NA

<LLD

<LLD 0

NB-95 NA

<LLD

<LLD 0

ZR-95 NA

<LLD

<LLD 0

CS-134 50

<LLD

<LLD 0

CS-137 60

<LLD

<LLD 0

BA-140 NA

<LLD

<LLD 0

LA-140 NA

<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:

DRESDEN DOCKET NUMBER:

LOCATION OF FACILITY:

MORRIS IL REPORTING PERIOD:

2020 INDICATOR CONTROL MEDIUM OR REQUIRED LOCATIONS LOCATION NUMBER OF PATHWAY SAMPLED TYPES OF NUMBER OF LOWER LIMIT MEAN (M)

MEAN (M)

STATION #

NONROUTINE (UNIT OF ANALYSIS ANALYSIS OF DETECTION (F)

(F)

NAME REPORTED MEASUREMENT)

PERFORMED PERFORMED (LLD)

RANGE RANGE RANGE DISTANCE AND DIRECTION MEASUREMENTS LOCATION WITH HIGHEST ANNUAL MEAN (M)

TABLE A-1 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANNUAL

SUMMARY

FOR DRESDEN NUCLEAR POWER STATION, 2020 50-010, 50-237 & 50-249 AIR IODINE GAMMA 723 (E-3 PCI/CU.M)

I-131 70

<LLD

<LLD 0

MILK I-131 (LOW LVL) 19 1

NA

<LLD 0

(PCI/LITER)

GAMMA 19 MN-54 NA NA

<LLD 0

CO-58 NA NA

<LLD 0

FE-59 NA NA

<LLD 0

CO-60 NA NA

<LLD 0

ZN-65 NA NA

<LLD 0

NB-95 NA NA

<LLD 0

ZR-95 NA NA

<LLD 0

CS-134 15 NA

<LLD 0

CS-137 18 NA

<LLD 0

BA-140 60 NA

<LLD 0

LA-140 15 NA

<LLD 0

VEGETATION GAMMA 67 (PCI/KG WET)

MN-54 NA

<LLD

<LLD 0

CO-58 NA

<LLD

<LLD 0

FE-59 NA

<LLD

<LLD 0

CO-60 NA

<LLD

<LLD 0

ZN-65 NA

<LLD

<LLD 0

NB-95 NA

<LLD

<LLD 0

ZR-95 NA

<LLD

<LLD 0

I-131 60

<LLD

<LLD 0

CS-134 60

<LLD

<LLD 0

CS-137 80

<LLD

<LLD 0

BA-140 NA

<LLD

<LLD 0

LA-140 NA

<LLD

<LLD 0

DIRECT RADIATION OSLD-QUARTERLY 184 NA 19.2 18.8 23.3 D-110 INDICATOR 0

(MILLI-ROENTGEN/QTR.)

(180/180)

(4/4)

(4/4) 10.4 - 27.8 14.1 - 23.0 18.7 - 27.4 0.9 MILES SSW (M) The Mean Values are calculated using the positive values. (F) Fraction of detectable measurement are indicated in parentheses A-3

Intentionally left blank

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

Intentionally left blank

TABLE B-1:

Radiological Environmental Monitoring Program - Sampling Locations, Distance and Direction, Dresden Nuclear Power Station, 2020 Location Location Description Distance & Direction From Site A.

Surface Water D-21 Illinois River at EJ&E Bridge (indicator) 1.4 miles WNW D-52 DesPlaines River at Will Road, Upstream (control) 1.1 miles ESE D-57 Kankakee River at Will Road (control) 2.0 miles SE B.

Ground/Well Water D-22 8150 N. Thorsen Road (indicator) 0.8 miles SSE D-23 Thorsen Well (indicator) 0.7 miles S D-24 8177 N. Thorsen Road (indicator) 0.6 miles SSE D-35 Dresden Lock & Dam Morris, IL (indicator) 0.8 miles NW C.

Milk - bi-weekly / monthly D-25 Vince Biros Farm, Reed Road (control) 11.3 miles SW D.

Air Particulates / Air Iodine D-01 Onsite Station 1 (indicator) 0.8 miles NW D-02 Onsite Station 2 (indicator) 0.3 miles NNE D-03 Onsite Station 3 (indicator) 0.4 miles S D-04 Collins Road, on Station property(indicator) 0.8 miles W D-07 Clay Products, Dresden Road (indicator) 2.6 miles S D-08 Jugtown Road, Prairie Parks (indicator) 3.8 miles SW D-10 Goose Lake Road, Goose Lake Village (indicator) 3.5 miles SSW D-12 Quarry Road, Lisbon (control) 10.5 miles NW D-14 Center Street, Channahon (indicator) 3.7 miles NE D-45 McKinley Woods Road, Channahon (indicator) 1.7 miles ENE D-53 Will Road, Hollyhock (indicator) 2.1 miles SSE D-55 Ridge Road, Minooka (indicator) 4.3 miles N D-56 Will Road, Wildfeather (indicator) 1.7 miles SE D-58 Will Road, Marina (indicator) 1.1 miles ESE E.

Fish D-28 Dresden Pool of Illinois River, Downstream (indicator) 0.9 miles NNW D-46 DesPlaines River, Upstream (control) 1.2 miles ESE F.

Sediment D-27 Illinois River at Dresden Lock and Dam, Downstream (indicator) 0.8 miles NW G.

Vegetation D-25 Vince Biros Farm, Reed Road 11.3 miles SW D-40 7715 E Hansel Road 0.9 miles NNW D-41 8100 E Blanchard Circle 0.5 miles SSE D-42 Dresden Site Garden 0.4 miles N D-43 25158 W Elm St 3.3 miles NE D-44 9980 Ridge Road 3.0 miles N B-1

TABLE B-1:

Radiological Environmental Monitoring Program - Sampling Locations, Distance and Direction, Dresden Nuclear Power Station, 2020 Location Location Description Distance & Direction From Site H.

Environmental Dosimetry - OSLD Inner Ring D-58 1.1 miles ESE D-101 1.0 miles N D-102 1.3 miles NNE D-103 1.2 miles NE D-104 1.7 miles ENE D-105 1.5 miles E D-106 1.1 miles ESE D-107 1.4 miles SE D-108 1.9 miles SSE D-109 0.8 miles S D-110 0.9 miles SSW D-111 0.6 miles SW D-112 0.7 miles WSW D-113 0.9 miles W D-114 0.9 miles WNW D-115 0.8 miles NW D-116 1.0 miles NNW Outer Ring D-201 4.8 miles N D-202 5.1 miles NNE D-203 4.7 miles NE D-204 5.0 miles ENE D-205 4.0 miles E D-206 3.5 miles ESE D-207 4.2 miles SE D-208 4.9 miles SSE D-209 4.1 miles S D-210 4.9 miles SSW D-211 4.8 miles SW D-212 6.0 miles WSW D-213 4.5 miles W D-214 5.0 miles WNW D-215 4.8 miles NW D-216 4.9 miles NNW Other Locations D-01 Onsite 1 0.8 miles NW D-02 Onsite 2 0.3 miles NNE D-03 Onsite 3 0.4 miles S D-04 Collins Road, on Station property 0.8 miles W D-07 Clay Products, Dresden Road 2.6 miles S D-08 Jugtown Road, Prairie Parks 3.8 miles SW D-10 Goose Lake Road, Goose Lake Village 3.5 miles SSW D-14 Center Street, Channahon 3.7 miles NE D-45 McKinley Woods Road, Channahon 1.7 miles ENE D-53 Will Road, Hollyhock 2.1 miles SSE D-55 Ridge Road, Minooka 4.3 miles N D-56 Will Road, Wildfeather 1.7 miles SE D-58 Will Road, Marina 1.1 miles ESE Control D-12 Lisbon 10.5 miles NW B-2

TABLE B-2:

Radiological Environmental Monitoring Program - Summary of Sample Collection and Analytical Methods, Dresden Nuclear Power Station, 2020 Sample Medium Analysis Sampling Method Collection Procedure Number Sample Size Analytical Procedure Number Surface Water Gamma Spectroscopy Monthly composite sample or monthly composite from weekly grab samples EIML-SPM-1, Environmental Incorporated Midwest Laboratory Sampling Procedures Manual TBE, TBE-2023 Compositing of samples EIML-COMP-01 procedure for compositing water and milk samples 2 gallon TBE, TBE-2007 Gamma-Emitting Radioisotope Analysis Surface Water Gross Beta Monthly composite sample or monthly composite from weekly grab samples EIML-SPM-1, Environmental Incorporated Midwest Laboratory Sampling Procedures Manual TBE, TBE-2023 Compositing of samples EIML-COMP-01 procedure for compositing water and milk samples 2 gallon TBE, TBE-2008 Gross Alpha and/or Gross Beta Activity in Various Matrices Surface Water Tritium Quarterly composite of monthly composite samples EIML-SPM-1, Environmental Incorporated Midwest Laboratory Sampling Procedures Manual TBE, TBE-2023 Compositing of samples EIML-COMP-01 procedure for compositing water and milk samples 500 ml TBE, TBE-2011 Tritium Analysis in Drinking Water by Liquid Scintillation Ground Water Gamma Spectroscopy Quarterly grab samples EIML-SPM-1, Environmental Incorporated Midwest Laboratory Sampling Procedures Manual 2 gallon TBE, TBE-2007 Gamma-Emitting Radioisotope Analysis Ground Water Tritium Quarterly grab samples EIML-SPM-1, Environmental Incorporated Midwest Laboratory Sampling Procedures Manual 500 ml TBE, TBE-2011 Tritium Analysis in Drinking Water by Liquid Scintillation Fish Gamma Spectroscopy Samples collected twice annually via electroshocking or other techniques EIML-SPM-1, Environmental Incorporated Midwest Laboratory Sampling Procedures Manual 1000 grams (wet)

TBE, TBE-2007 Gamma-Emitting Radioisotope Analysis Sediment Gamma Spectroscopy Semi-annual grab samples EIML-SPM-1, Environmental Incorporated Midwest Laboratory Sampling Procedures Manual 500 grams (dry)

TBE, TBE-2007 Gamma-Emitting Radioisotope Analysis B-3

TABLE B-2:

Radiological Environmental Monitoring Program - Summary of Sample Collection and Analytical Methods, Dresden Nuclear Power Station, 2020 Sample Medium Analysis Sampling Method Collection Procedure Number Sample Size Analytical Procedure Number Dredging Spoils Gamma Spectroscopy Annual grab samples if dredging occurred within 1 mile of Dresden Station during the year.

EIML-SPM-1, Environmental Incorporated Midwest Laboratory Sampling Procedures Manual 500 grams (dry)

TBE, TBE-2007 Gamma-Emitting Radioisotope Analysis Air Particulates Gross Beta One-week of continuous air sampling through glass fiber filter paper EIML-SPM-1, Environmental Incorporated Midwest Laboratory Sampling Procedures Manual 1 filter (approximately 280 cubic meters weekly)

TBE, TBE-2008 Gross Alpha and/or Gross Beta Activity in Various Matrices Air Particulates Gamma Spectroscopy Quarterly composite of each station TBE, TBE-2023 Compositing of samples Env. Inc., AP-03 Procedure for compositing air particulate filters for gamma spectroscopic analysis 13 filters TBE, TBE-2007 Gamma-Emitting Radioisotope Analysis Air Iodine Gamma Spectroscopy One-or two-week composite of continuous air sampling through charcoal filter EIML-SPM-1, Environmental Incorporated Midwest Laboratory Sampling Procedures Manual 1 filter (approximately 280 cubic meters weekly)

TBE, TBE-2007 Gamma-Emitting Radioisotope Analysis Milk I-131 Bi-weekly grab sample May through October; Monthly all other times EIML-SPM-1, Environmental Incorporated Midwest Laboratory Sampling Procedures Manual 2 gallon TBE, TBE-2012 Radioiodine in Various Matrices Milk Gamma Spectroscopy Bi-weekly grab sample May through October; Monthly all other times EIML-SPM-1, Environmental Incorporated Midwest Laboratory Sampling Procedures Manual 2 gallon TBE, TBE-2007 Gamma-Emitting Radioisotope Analysis Food Products Gamma Spectroscopy Annual grab samples.

EIML-SPM-1, Environmental Incorporated Midwest Laboratory Sampling Procedures Manual 1000 grams TBE, TBE-2007 Gamma-Emitting Radioisotope Analysis OSLD Optically Stimulated Luminescence Dosimetry Quarterly OSLDs comprised of two Al2O3:C Landauer Incorporated elements.

EIML-SPM-1, Environmental Incorporated Midwest Laboratory Sampling Procedures Manual 2 dosimeters at each location Landauer Incorporated B-4

Figure B-1 Dresden Station Inner Ring OSLD Locations, Fish, Water, and Sediment Location, 2020 B-5

Figure B-2 Dresden Station Fixed Air Sampling and OSLD Sites, Outer Ring OSLD Locations and Milk Location, 2020 B-6

APPENDIX C DATA TABLES AND FIGURES

Intentionally left blank

Table C-I.1 COLLECTION PERIOD D-21 D-52 D-57 12/27/19 - 01/31/20 5.2 +/- 2.1 15.5 +/- 3.0 5.1 +/- 1.9 01/31/20 - 02/28/20 4.4 +/- 2.1 5.4 +/- 2.3

< 2.5 02/28/20 - 03/27/20 4.0 +/- 2.3 13.3 +/- 3.2 8.5 +/- 2.4 03/27/20 - 04/24/20 8.9 +/- 2.4 13.0 +/- 2.7 7.0 +/- 1.9 04/24/20 - 05/29/20 7.8 +/- 2.4 6.9 +/- 2.3 7.4 +/- 2.5 05/29/20 - 06/26/20 5.0 +/- 2.3 6.3 +/- 2.5 3.6 +/- 2.2 06/26/20 - 07/31/20 8.5 +/- 2.3 7.3 +/- 2.1 4.0 +/- 1.8 07/31/20 - 08/28/20 7.0 +/- 2.1 8.6 +/- 2.3 4.6 +/- 2.0 08/28/20 - 09/25/20 6.9 +/- 2.4 9.8 +/- 2.5 3.9 +/- 2.1 09/25/20 - 10/30/20 7.2 +/- 2.3 7.6 +/- 2.3 3.8 +/- 1.9 10/30/20 - 11/27/20 11.8 +/- 2.7 15.3 +/- 2.9 8.2 +/- 2.3 11/27/20 - 12/24/20 4.8 +/- 1.8 6.8 +/- 2.0 5.1 +/- 1.9 MEAN +/- 2 STD DEV 6.8 +/- 4.6 9.6 +/- 7.3 5.6 +/- 3.7 Table C-I.2 COLLECTION PERIOD D-52 D-57 12/27/19 -

03/27/20 273 +/- 110

< 158

< 155 03/27/20 -

06/26/20 254 +/- 123

< 181 362 +/- 126 06/26/20 -

06/26/20

< 196

< 185 07/03/20 -

09/25/20

< 184 09/25/20 -

12/24/20 232 +/- 127

< 190 268 +/- 131 MEAN +/- 2 STD DEV 253 +/- 41 315 +/- 133 THE MEAN AND 2 STANDARD DEVIATION ARE CALCULATED USING THE POSITIVE VALUES D-21 CONCENTRATIONS OF GROSS BETA IN SURFACE WATER SAMPLES COLLECTED IN THE VICINITY OF DRESDEN NUCLEAR POWER STATION, 2020 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA CONCENTRATIONS OF TRITIUM IN SURFACE WATER SAMPLES COLLECTED IN THE VICINITY OF DRESDEN NUCLEAR POWER STATION, 2020 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA C-1

Table C-I.3 COLLECTION SITE PERIOD Mn-54 Fe-59 Co-60 Zn-65 Zr-95 La-140 D-21 12/27/19 - 01/31/20

< 5

< 15

< 6

< 14

< 8

< 13

< 11

< 8

< 5

< 28

< 12 01/31/20 - 02/28/20

< 7

< 6

< 14

< 7

< 12

< 6

< 10

< 8

< 6

< 29

< 9 02/28/20 - 03/27/20

< 6

< 7

< 15

< 7

< 10

< 8

< 13

< 9

< 8

< 30

< 10 03/27/20 - 04/24/20

< 5

< 12

< 7

< 12

< 8

< 11

< 9

< 7

< 27

< 10 04/24/20 - 05/29/20

< 6

< 5

< 13

< 7

< 9

< 7

< 12

< 9

< 8

< 7

< 24

< 7 05/29/20 - 06/26/20

< 6

< 7

< 13

< 6

< 13

< 6

< 11

< 6

< 7

< 26

< 8 06/26/20 - 07/31/20

< 7

< 12

< 6

< 15

< 8

< 13

< 11

< 5

< 8

< 26

< 11 07/31/20 - 08/28/20

< 5

< 7

< 18

< 8

< 11

< 7

< 15

< 10

< 9

< 8

< 29

< 8 08/28/20 - 09/25/20

< 6

< 7

< 16

< 9

< 17

< 7

< 12

< 9

< 8

< 7

< 31

< 11 09/25/20 - 10/30/20

< 6

< 8

< 17

< 6

< 13

< 8

< 13

< 10

< 8

< 9

< 26

< 9 10/30/20 - 11/27/20

< 7

< 13

< 8

< 16

< 9

< 12

< 11

< 7

< 8

< 26

< 12 11/27/20 - 12/24/20

< 7

< 8

< 16

< 9

< 14

< 7

< 13

< 11

< 8

< 7

< 30

< 12 MEAN D-52 01/04/20 -

01/31/20

< 6

< 9

< 13

< 7

< 14

< 7

< 11

< 9

< 8

< 32

< 7 02/07/20 - 02/28/20

< 7

< 13

< 5

< 11

< 8

< 11

< 10

< 7

< 30

< 6 03/06/20 - 03/27/20

< 7

< 13

< 9

< 13

< 6

< 12

< 10

< 8

< 31

< 8 04/03/20 - 04/24/20

< 6

< 11

< 6

< 12

< 6

< 10

< 9

< 7

< 6

< 30

< 8 05/01/20 - 05/29/20

< 6

< 15

< 9

< 15

< 8

< 12

< 9

< 7

< 33

< 13 06/05/20 - 06/26/20

< 5

< 12

< 6

< 12

< 5

< 9

< 8

< 6

< 28

< 8 07/03/20 - 07/31/20

< 5

< 7

< 11

< 8

< 13

< 7

< 12

< 9

< 8

< 7

< 21

< 7 08/07/20 - 08/28/20

< 6

< 8

< 11

< 7

< 13

< 7

< 12

< 10

< 9

< 8

< 32

< 10 09/04/20 - 09/25/20

< 7

< 6

< 13

< 7

< 14

< 6

< 9

< 8

< 6

< 7

< 28

< 9 10/02/20 - 10/30/20

< 8

< 7

< 10

< 8

< 15

< 8

< 13

< 10

< 8

< 9

< 27

< 10 11/06/20 - 11/27/20

< 7

< 14

< 6

< 10

< 5

< 10

< 9

< 6

< 7

< 26

< 10 12/04/20 - 12/24/20

< 5

< 6

< 9

< 8

< 13

< 7

< 10

< 8

< 9

< 28

< 9 MEAN D-57 01/31/20 - 01/31/20

< 7

< 6

< 13

< 7

< 18

< 6

< 11

< 9

< 7

< 28

< 10 02/28/20 -

02/28/20

< 5

< 7

< 15

< 8

< 16

< 7

< 10

< 8

< 6

< 8

< 31

< 8 03/27/20 -

03/27/20

< 6

< 5

< 10

< 8

< 10

< 7

< 11

< 8

< 7

< 4

< 27

< 10 04/24/20 - 04/24/20

< 6

< 7

< 13

< 7

< 14

< 8

< 11

< 9

< 7

< 30

< 12 05/29/20 - 05/29/20

< 7

< 8

< 18

< 9

< 13

< 9

< 15

< 12

< 9

< 8

< 37

< 9 06/26/20 - 06/26/20

< 7

< 6

< 12

< 8

< 14

< 6

< 12

< 8

< 9

< 8

< 27

< 10 07/31/20 - 07/31/20

< 7

< 17

< 7

< 13

< 7

< 14

< 12

< 6

< 9

< 33

< 6 08/28/20 - 08/28/20

< 7

< 11

< 8

< 12

< 8

< 13

< 10

< 7

< 30

< 9 09/25/20 - 09/25/20

< 6

< 5

< 9

< 5

< 10

< 6

< 11

< 9

< 7

< 27

< 9 10/30/20 - 10/30/20

< 7

< 5

< 12

< 9

< 13

< 7

< 15

< 7

< 6

< 24

< 12 11/27/20 - 11/27/20

< 8

< 5

< 15

< 10

< 18

< 9

< 12

< 6

< 9

< 28

< 13 12/24/20 - 12/24/20

< 8

< 6

< 13

< 8

< 15

< 8

< 13

< 10

< 8

< 7

< 33

< 10 MEAN CONCENTRATIONS OF GAMMA EMITTERS IN SURFACE WATER SAMPLES COLLECTED IN THE VICINITY OF DRESDEN NUCLEAR POWER STATION, 2020 RESULTS IN UNITS OF PCI/LITER + 2 SIGMA Co-58 Nb-95 Cs-137 Cs-134 Ba-140 I-131 C-2

Table C-II.1 COLLECTION PERIOD D-22 D-35 01/11/20 - 01/31/20

< 182

< 187

< 181

< 186 04/10/20 - 04/10/20

< 191

< 192

< 191 07/10/20 - 07/10/20

< 189

< 185

< 186 10/09/20 - 10/09/20

< 182

< 178

< 186 MEAN D-24 D-23 CONCENTRATIONS OF TRITIUM IN GROUND WATER SAMPLES COLLECTED IN THE VICINITY OF DRESDEN NUCLEAR POWER STATION, 2020 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA C-3

Tables C-II.2 COLLECTION SITE PERIOD Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 I-131 Cs-134 Cs-137 Ba-140 La-140 D-22 01/31/20 - 01/31/20

< 7

< 9

< 14

< 12

< 16

< 8

< 9

< 10

< 8

< 9

< 35

< 11 04/10/20 - 04/10/20

< 7

< 9

< 14

< 9

< 16

< 7

< 14

< 11

< 7

< 9

< 35

< 9 07/10/20 - 07/10/20

< 7

< 8

< 17

< 7

< 12

< 8

< 13

< 10

< 9

< 8

< 37

< 11 10/09/20 - 10/09/20

< 6

< 14

< 9

< 13

< 5

< 13 9

< 10

< 7

< 37

< 7 MEAN D-23 01/11/20 - 01/11/20

< 8

< 6

< 16

< 7

< 14

< 7

< 11

< 9

< 7

< 33

< 11 D-24 01/24/20 - 01/24/20

< 7

< 5

< 13

< 7

< 13

< 7

< 11

< 9

< 7

< 30

< 7 04/10/20 - 04/10/20

< 5

< 8

< 13

< 5

< 14

< 9

< 13

< 10

< 7

< 30

< 9 07/10/20 - 07/10/20

< 6

< 11

< 6

< 16

< 5

< 11

< 10

< 6

< 25

< 12 10/09/20 - 10/09/20

< 8

< 7

< 9

< 12

< 10

< 14

< 11

< 9

< 8

< 29

< 9 MEAN D-35 01/11/20 - 01/11/20

< 6

< 15

< 8

< 11

< 7

< 10

< 8

< 6

< 23

< 11 04/10/20 - 04/10/20

< 7

< 18

< 7

< 20

< 8

< 10

< 9

< 7

< 6

< 27

< 15 07/10/20 - 07/10/20

< 9

< 8

< 13

< 8

< 16

< 7

< 14

< 10

< 8

< 9

< 29

< 10 10/09/20 - 10/09/20

< 8

< 18

< 8

< 13

< 8

< 13

< 10

< 8

< 28

< 9 MEAN CONCENTRATIONS OF GAMMA EMITTERS IN GROUND WATER SAMPLES COLLECTED IN THE VICINITY OF DRESDEN NUCLEAR POWER STATION, 2020 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA C-4

Table C-III.1 COLLECTION SITE PERIOD Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 Cs-134 Cs-137 Ba-140 La-140 D-28 PREDATOR Largemouth Bass 05/13/20

< 39

< 45

< 99

< 41

< 84

< 40 76

< 43

< 50

< 246

< 40 Smallmouth Bass 10/09/20

< 81

< 74

< 163

< 68

< 145

< 79

< 119

< 71

< 79

< 320

< 111 MEAN D-28 BOTTOM FEEDER Smallmouth Buffalo 05/13/20

< 37

< 78

< 40

< 75

< 38

< 65

< 45

< 38

< 181

< 41 Common Carp 10/09/20

< 42

< 41

< 86

< 60

< 106

< 40

< 96

< 51

< 41

< 216

< 66 MEAN D-46 PREDATOR Largemouth Bass 10/09/20

< 74

< 80

< 150

< 77

< 140

< 80

< 117

< 84

< 66

< 344

< 102 MEAN D-46 BOTTOM FEEDER Channel Catfish 05/13/20

< 43

< 40

< 88

< 39

< 92

< 47

< 84

< 49

< 45

< 224

< 36 Common Carp 05/13/20

< 43

< 50

< 55

< 36

< 86

< 47

< 66

< 44

< 52

< 230

< 44 Common Carp 10/09/20

< 66

< 50

< 142

< 34

< 95

< 78

< 91

< 88

< 71

< 315

< 85 MEAN RESULTS IN UNITS OF PCI/KG WET + 2 SIGMA COLLECTED IN THE VICINITY OF DRESDEN NUCLEAR POWER STATION, 2020 CONCENTRATIONS OF GAMMA EMITTERS IN FISH SAMPLES C-5

Table C-IV.1 COLLECTION SITE PERIOD Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 Cs-134 D-27 06/08/20

< 129

< 141

< 216

< 140

< 292

< 124

< 224

< 147

< 169

< 473

< 154 10/13/20

< 63

< 66

< 140

< 75

< 118

< 68

< 124

< 86 96

< 319

< 110 MEAN La-140 CONCENTRATIONS OF GAMMA EMITTERS IN SEDIMENT SAMPLES COLLECTED IN THE VICINITY OF DRESDEN NUCLEAR POWER STATION, 2020 RESULTS IN UNITS OF PCI/KG DRY +/- 2 SIGMA Ba-140 Cs-137 C-6

Table C-V.1 COLLECTION GROUP I GROUP II PERIOD D-01 D-02 D-03 D-04 D-07 D-45 D-53 D-56 D-58 01/04/20 - 01/11/20 8 +/- 4 9 +/- 4 8 +/- 4 8 +/- 4 13 +/- 4 8 +/- 4 8 +/- 4 7 +/- 4 7 +/- 4 01/11/20 - 01/17/20 17 +/- 5 19 +/- 5 20 +/- 5 20 +/- 5 21 +/- 5 23 +/- 5 19 +/- 5 16 +/- 4 18 +/- 5 01/17/20 - 01/24/20 21 +/- 5 20 +/- 4 24 +/- 5 21 +/- 5 27 +/- 5 23 +/- 5 19 +/- 4 19 +/- 4 21 +/- 4 01/24/20 - 01/31/20 12 +/- 4 17 +/- 4 17 +/- 4 17 +/- 4 11 +/- 4 15 +/- 4 13 +/- 4 17 +/- 4 16 +/- 4 01/31/20 - 02/07/20 12 +/- 4 9 +/- 4 13 +/- 4 12 +/- 4 11 +/- 4 11 +/- 4 10 +/- 4 6 +/- 4 11 +/- 4 02/07/20 - 02/14/20 13 +/- 4 15 +/- 4 17 +/- 4 16 +/- 4 13 +/- 4 17 +/- 4 14 +/- 4 14 +/- 4 15 +/- 4 02/14/20 - 02/21/20 17 +/- 5 17 +/- 4 22 +/- 5 20 +/- 5 19 +/- 5 17 +/- 5 12 +/- 4 14 +/- 5 16 +/- 4 02/21/20 - 02/28/20 19 +/- 4 22 +/- 5 25 +/- 5 24 +/- 5 23 +/- 5 21 +/- 4 17 +/- 4 21 +/- 5 22 +/- 5 02/28/20 - 03/06/20 9 +/- 4 11 +/- 4 10 +/- 4 11 +/- 4 10 +/- 4 13 +/- 4 9 +/- 4 7 +/- 4 9 +/- 4 03/06/20 - 03/13/20 16 +/- 4 19 +/- 4 19 +/- 4 18 +/- 4 17 +/- 4 22 +/- 4 16 +/- 4 16 +/- 4 19 +/- 4 03/13/20 - 03/20/20 9 +/- 4 14 +/- 4 15 +/- 4 12 +/- 4 12 +/- 4 15 +/- 4 10 +/- 4 10 +/- 4 11 +/- 4 03/20/20 - 03/27/20 12 +/- 4 12 +/- 4 13 +/- 4 15 +/- 4 16 +/- 4 14 +/- 4 11 +/- 4 9 +/- 4 9 +/- 4 03/27/20 - 04/03/20 10 +/- 4 7 +/- 4 10 +/- 4 10 +/- 4 8 +/- 4 10 +/- 4 7 +/- 4 6 +/- 4 10 +/- 4 04/03/20 - 04/10/20 15 +/- 4 16 +/- 4 17 +/- 5 16 +/- 4 18 +/- 5 17 +/- 4 16 +/- 4 13 +/- 4 14 +/- 4 04/10/20 - 04/17/20 13 +/- 4 15 +/- 4 19 +/- 4 18 +/- 4 18 +/- 4 23 +/- 5 13 +/- 4 15 +/- 4 15 +/- 4 04/17/20 - 04/24/20 13 +/- 4 11 +/- 4 14 +/- 4 16 +/- 4 13 +/- 4 15 +/- 4 12 +/- 4 12 +/- 4 13 +/- 4 04/24/20 - 05/01/20 13 +/- 4 16 +/- 4 17 +/- 4 14 +/- 4 17 +/- 4 12 +/- 4 13 +/- 4 11 +/- 3 11 +/- 3 05/01/20 - 05/08/20 7 +/- 4 11 +/- 4 11 +/- 4 11 +/- 4 10 +/- 4 13 +/- 4 8 +/- 4 8 +/- 4 9 +/- 4 05/08/20 - 05/15/20 8 +/- 3 13 +/- 4 10 +/- 4 11 +/- 4 11 +/- 4 14 +/- 4 11 +/- 4 10 +/- 4 11 +/- 4 05/15/20 - 05/22/20 7 +/- 4 10 +/- 4 9 +/- 4 9 +/- 4 9 +/- 4 11 +/- 4

< 6

< 6 7 +/- 4 05/22/20 - 05/29/20 13 +/- 4 14 +/- 4 17 +/- 4 13 +/- 4 14 +/- 4 16 +/- 4 12 +/- 4 10 +/- 3 10 +/- 3 05/29/20 - 06/05/20 11 +/- 4 17 +/- 4 14 +/- 4 11 +/- 4 14 +/- 4 15 +/- 4 10 +/- 3 11 +/- 4 11 +/- 4 06/05/20 - 06/12/20 10 +/- 3 12 +/- 4 15 +/- 4 10 +/- 3 11 +/- 3 12 +/- 4 10 +/- 3 12 +/- 4 11 +/- 3 06/12/20 - 06/19/20 22 +/- 4 17 +/- 4 16 +/- 4 14 +/- 4 17 +/- 4 19 +/- 4 16 +/- 4 13 +/- 4 16 +/- 4 06/19/20 - 06/26/20 24 +/- 5 20 +/- 5 22 +/- 5 19 +/- 5 15 +/- 4 25 +/- 5 19 +/- 5 13 +/- 4 14 +/- 4 06/26/20 - 07/03/20 16 +/- 4 18 +/- 4 16 +/- 4 16 +/- 4 15 +/- 4 19 +/- 4 13 +/- 4 12 +/- 4 13 +/- 4 07/03/20 - 07/10/20 24 +/- 5 30 +/- 5 25 +/- 5 20 +/- 4 27 +/- 5 21 +/- 4 22 +/- 4 19 +/- 4 20 +/- 4 07/10/20 - 07/17/20 19 +/- 4 16 +/- 4 16 +/- 4 16 +/- 4 18 +/- 4 19 +/- 4 15 +/- 4 21 +/- 4 13 +/- 4 07/17/20 - 07/24/20 17 +/- 4 20 +/- 4 17 +/- 4 15 +/- 4 15 +/- 4 17 +/- 4 15 +/- 4 15 +/- 4 18 +/- 4 07/24/20 - 07/31/20 18 +/- 4 17 +/- 4 9 +/- 4 16 +/- 4 14 +/- 4 20 +/- 4 13 +/- 4 15 +/- 4 18 +/- 4 07/31/20 - 08/07/20 13 +/- 4 12 +/- 4 10 +/- 4 10 +/- 4 9 +/- 4 15 +/- 4 10 +/- 4 14 +/- 4 11 +/- 4 08/07/20 - 08/14/20 26 +/- 5 24 +/- 5 25 +/- 5 22 +/- 4 23 +/- 4 25 +/- 5 22 +/- 4 27 +/- 5 23 +/- 4 08/14/20 - 08/21/20 19 +/- 4 18 +/- 4 20 +/- 4 19 +/- 4 19 +/- 4 20 +/- 4 16 +/- 4 22 +/- 4 14 +/- 4 08/21/20 - 08/28/20 27 +/- 5 28 +/- 5 30 +/- 6 20 +/- 5 28 +/- 5 22 +/- 5 21 +/- 5 33 +/- 6 20 +/- 5 08/28/20 - 09/04/20 17 +/- 4 18 +/- 4 17 +/- 4 14 +/- 4 18 +/- 4 14 +/- 4 14 +/- 3 16 +/- 4 11 +/- 3 09/04/20 - 09/11/20 11 +/- 3 13 +/- 3 12 +/- 3 10 +/- 3 13 +/- 3 9 +/- 3 8 +/- 3 11 +/- 3 8 +/- 3 09/11/20 - 09/18/20 14 +/- 4 16 +/- 4 15 +/- 4 13 +/- 4 17 +/- 4 14 +/- 4 15 +/- 4 18 +/- 4 14 +/- 4 09/18/20 - 09/25/20 22 +/- 4 27 +/- 5 25 +/- 4 20 +/- 4 26 +/- 5 24 +/- 4 20 +/- 4 24 +/- 4 26 +/- 4 09/25/20 - 10/02/20 11 +/- 4 8 +/- 4 14 +/- 4 11 +/- 4 12 +/- 4 10 +/- 4 10 +/- 4 13 +/- 4 13 +/- 4 10/02/20 - 10/09/20 16 +/- 4 15 +/- 4 22 +/- 6 14 +/- 4 16 +/- 4 14 +/- 4 17 +/- 4 17 +/- 4 15 +/- 4 10/09/20 - 10/16/20 25 +/- 5 25 +/- 5 (1) 18 +/- 4 28 +/- 5 18 +/- 4 20 +/- 4 21 +/- 5 19 +/- 4 10/16/20 - 10/23/20 16 +/- 4 18 +/- 4 (1) 18 +/- 4 22 +/- 5 16 +/- 4 24 +/- 7 23 +/- 5 15 +/- 4 10/23/20 - 10/30/20 18 +/- 5 (1)

(1) 13 +/- 4 16 +/- 4 11 +/- 4 (1) 17 +/- 5 17 +/- 4 10/30/20 - 11/06/20 35 +/- 5 33 +/- 5 35 +/- 5 37 +/- 6 30 +/- 5 30 +/- 5 27 +/- 5 30 +/- 5 28 +/- 5 11/06/20 - 11/13/20 18 +/- 4 24 +/- 4 20 +/- 4 20 +/- 4 20 +/- 4 18 +/- 4 20 +/- 4 21 +/- 4 20 +/- 4 11/13/20 - 11/20/20 19 +/- 4 27 +/- 5 22 +/- 5 23 +/- 5 24 +/- 5 22 +/- 5 21 +/- 5 30 +/- 5 19 +/- 4 11/20/20 - 11/27/20 19 +/- 5 27 +/- 5 22 +/- 5 27 +/- 5 26 +/- 5 16 +/- 5 15 +/- 4 24 +/- 5 20 +/- 5 11/27/20 - 12/04/20 20 +/- 4 23 +/- 5 20 +/- 4 24 +/- 5 22 +/- 4 18 +/- 4 16 +/- 4 23 +/- 5 18 +/- 4 12/04/20 - 12/11/20 36 +/- 6 43 +/- 6 38 +/- 6 31 +/- 6 36 +/- 6 31 +/- 6 33 +/- 6 39 +/- 6 29 +/- 5 12/11/20 - 12/18/20 16 +/- 4 22 +/- 4 14 +/- 4 16 +/- 4 21 +/- 4 16 +/- 4 12 +/- 4 17 +/- 4 15 +/- 4 12/18/20 - 12/24/20 26 +/- 5 40 +/- 6 31 +/- 6 30 +/- 5 33 +/- 6 34 +/- 6 22 +/- 5 36 +/- 6 28 +/- 5 12/24/20 - 01/02/21 14 +/- 3 19 +/- 4 21 +/- 4 15 +/- 3 18 +/- 4 13 +/- 3 15 +/- 3 15 +/- 3 15 +/- 3 MEAN +/- 2 STD DEV 17 +/- 13 18 +/- 15 18 +/- 13 17 +/- 12 18 +/- 13 17 +/- 11 15 +/- 11 17 +/- 15 15 +/- 11 THE MEAN AND 2 STANDARD DEVIATION ARE CALCULATED USING THE POSITIVE VALUES (1) SEE PROGRAM EXCEPTIONS SECTION FOR EXPLANATION CONCENTRATIONS OF GROSS BETA IN AIR PARTICULATE SAMPLES COLLECTED IN THE VICINITY OF DRESDEN NUCLEAR POWER STATION, 2020 RESULTS IN UNITS OF E-3 PCI/CU METER +/- 2 SIGMA C-7

Table C-V.1 CONCENTRATIONS OF GROSS BETA IN AIR PARTICULATE SAMPLES COLLECTED IN THE VICINITY OF DRESDEN NUCLEAR POWER STATION, 2020 RESULTS IN UNITS OF E-3 PCI/CU METER +/- 2 SIGMA COLLECTION PERIOD D-08 D-10 D-14 D-55 D-12 01/04/20 - 01/11/20 9 +/- 4 8 +/- 4 9 +/- 4 13 +/- 4 11 +/- 4 01/11/20 - 01/17/20 17 +/- 4 19 +/- 5 15 +/- 4 22 +/- 5 20 +/- 5 01/17/20 - 01/24/20 23 +/- 5 19 +/- 4 23 +/- 5 24 +/- 5 22 +/- 5 01/24/20 - 01/31/20 13 +/- 4 12 +/- 4 14 +/- 4 17 +/- 4 21 +/- 6 01/31/20 - 02/07/20 12 +/- 4 11 +/- 4 12 +/- 4 13 +/- 4 10 +/- 5 02/07/20 - 02/14/20 14 +/- 4 11 +/- 4 16 +/- 4 15 +/- 4 17 +/- 4 02/14/20 - 02/21/20 16 +/- 4 18 +/- 5 15 +/- 4 21 +/- 5 23 +/- 5 02/21/20 - 02/28/20 19 +/- 4 19 +/- 4 21 +/- 5 23 +/- 5 23 +/- 5 02/28/20 - 03/06/20 9 +/- 4 9 +/- 4 10 +/- 4 13 +/- 4 13 +/- 4 03/06/20 - 03/13/20 15 +/- 4 15 +/- 4 15 +/- 4 20 +/- 4 20 +/- 4 03/13/20 - 03/20/20 9 +/- 4 9 +/- 4 13 +/- 4 17 +/- 4 11 +/- 4 03/20/20 - 03/27/20 8 +/- 4 10 +/- 4 11 +/- 4 12 +/- 4 10 +/- 4 03/27/20 - 04/03/20 5 +/- 3 10 +/- 4 8 +/- 4 11 +/- 4 9 +/- 4 04/03/20 - 04/10/20 17 +/- 4 16 +/- 4 15 +/- 4 19 +/- 5 16 +/- 4 04/10/20 - 04/17/20 18 +/- 4 14 +/- 4 16 +/- 4 17 +/- 4 11 +/- 6 04/17/20 - 04/24/20 10 +/- 4 10 +/- 4 11 +/- 4 13 +/- 4 13 +/- 4 04/24/20 - 05/01/20 15 +/- 4 13 +/- 4 15 +/- 4 17 +/- 4 18 +/- 4 05/01/20 - 05/08/20 10 +/- 4 9 +/- 4 10 +/- 4 11 +/- 4 12 +/- 4 05/08/20 - 05/15/20 10 +/- 4 9 +/- 3 11 +/- 4 13 +/- 4 11 +/- 4 05/15/20 - 05/22/20 7 +/- 4 7 +/- 4 6 +/- 4 6 +/- 4 7 +/- 4 05/22/20 - 05/29/20 11 +/- 4 11 +/- 3 16 +/- 4 14 +/- 4 15 +/- 4 05/29/20 - 06/05/20 13 +/- 4 12 +/- 4 11 +/- 4 13 +/- 4 14 +/- 4 06/05/20 - 06/12/20 10 +/- 3 11 +/- 3 11 +/- 3 13 +/- 4 13 +/- 4 06/12/20 - 06/19/20 14 +/- 4 17 +/- 4 16 +/- 4 14 +/- 4 15 +/- 4 06/19/20 - 06/26/20 19 +/- 5 18 +/- 5 17 +/- 4 18 +/- 5 23 +/- 5 06/26/20 - 07/03/20 16 +/- 4 14 +/- 4 15 +/- 4 18 +/- 4 18 +/- 4 07/03/20 - 07/10/20 21 +/- 5 21 +/- 4 23 +/- 5 21 +/- 4 26 +/- 5 07/10/20 - 07/17/20 18 +/- 4 18 +/- 4 19 +/- 4 18 +/- 4 20 +/- 4 07/17/20 - 07/24/20 17 +/- 4 17 +/- 4 17 +/- 4 16 +/- 4 23 +/- 5 07/24/20 - 07/31/20 13 +/- 4 14 +/- 4 18 +/- 4 16 +/- 4 17 +/- 4 07/31/20 - 08/07/20 13 +/- 4 9 +/- 4 13 +/- 4 15 +/- 4 20 +/- 4 08/07/20 - 08/14/20 23 +/- 4 25 +/- 5 23 +/- 4 28 +/- 5 28 +/- 5 08/14/20 - 08/21/20 16 +/- 4 19 +/- 4 21 +/- 4 18 +/- 4 21 +/- 4 08/21/20 - 08/28/20 22 +/- 5 24 +/- 5 25 +/- 5 24 +/- 5 30 +/- 6 08/28/20 - 09/04/20 16 +/- 4 16 +/- 4 14 +/- 4 15 +/- 4 13 +/- 3 09/04/20 - 09/11/20 10 +/- 3 10 +/- 3 12 +/- 3 12 +/- 3 12 +/- 3 09/11/20 - 09/18/20 12 +/- 4 14 +/- 4 18 +/- 4 14 +/- 4 18 +/- 4 09/18/20 - 09/25/20 21 +/- 4 21 +/- 4 21 +/- 4 25 +/- 4 24 +/- 4 09/25/20 - 10/02/20 12 +/- 4 8 +/- 4 13 +/- 4 9 +/- 4 11 +/- 4 10/02/20 - 10/09/20 14 +/- 4 14 +/- 4 17 +/- 4 12 +/- 4 15 +/- 4 10/09/20 - 10/16/20 24 +/- 5 19 +/- 4 25 +/- 5 22 +/- 5 25 +/- 5 10/16/20 - 10/23/20 21 +/- 5 21 +/- 5 18 +/- 4 19 +/- 4 18 +/- 4 10/23/20 - 10/30/20 14 +/- 4 13 +/- 4 16 +/- 4 17 +/- 5 13 +/- 4 10/30/20 - 11/06/20 26 +/- 5 29 +/- 5 29 +/- 5 31 +/- 5 27 +/- 5 11/06/20 - 11/13/20 17 +/- 4 18 +/- 4 20 +/- 4 19 +/- 4 25 +/- 5 11/13/20 - 11/20/20 21 +/- 4 20 +/- 4 23 +/- 5 22 +/- 5 21 +/- 4 11/20/20 - 11/27/20 24 +/- 5 23 +/- 5 19 +/- 5 23 +/- 5 22 +/- 5 11/27/20 - 12/04/20 26 +/- 5 17 +/- 4 18 +/- 4 22 +/- 5 22 +/- 5 12/04/20 - 12/11/20 42 +/- 6 39 +/- 6 32 +/- 6 30 +/- 5 39 +/- 6 12/11/20 - 12/18/20 19 +/- 4 15 +/- 4 13 +/- 4 15 +/- 4 17 +/- 4 12/18/20 - 12/24/20 32 +/- 6 32 +/- 6 28 +/- 6 30 +/- 5 31 +/- 6 12/24/20 - 01/02/21 22 +/- 4 15 +/- 3 18 +/- 4 38 +/- 9 21 +/- 4 MEAN +/- 2 STD DEV 16 +/- 13 16 +/- 13 17 +/- 11 18 +/- 12 18 +/- 13 THE MEAN AND 2 STANDARD DEVIATION ARE CALCULATED USING THE POSITIVE VALUES GROUP IV GROUP III C-8

Table C-V.2 GROUP I - ON-SITE LOCATIONS GROUP II - NEAR-FIELD LOCATIONS GROUP III - FAR-FIELD LOCATIONS GROUP IV - CONTROL LOCATION COLLECTION MIN MAX COLLECTION MIN MAX COLLECTION MIN MAX COLLECTION MIN MAX PERIOD PERIOD PERIOD PERIOD 01/04/20 - 01/31/20 8

24 16 +/- 11 01/04/20 - 01/31/20 7

27 16 +/- 11 01/04/20 - 01/31/20 8

24 16 +/- 10 01/04/20 - 01/31/20 11 22 19 +/- 10 01/31/20 - 02/28/20 9

25 17 +/- 9 01/31/20 - 02/28/20 6

24 16 +/- 9 01/31/20 - 02/28/20 11 23 16 +/- 8 01/31/20 - 02/28/20 10 23 18 +/- 12 02/28/20 - 04/03/20 7

19 12 +/- 7 02/28/20 - 04/03/20 6

22 12 +/- 8 02/28/20 - 04/03/20 5

20 11 +/- 7 02/28/20 - 04/03/20 9

20 12 +/- 9 04/03/20 - 05/01/20 11 19 15 +/- 4 04/03/20 - 05/01/20 11 23 15 +/- 6 04/03/20 - 05/01/20 10 19 15 +/- 5 04/03/20 - 05/01/20 11 18 15 +/- 6 05/01/20 - 05/29/20 7

17 11 +/- 6 05/01/20 - 05/29/20 7

16 11 +/- 5 05/01/20 - 05/29/20 6

16 10 +/- 5 05/01/20 - 05/29/20 7

15 11 +/- 7 05/29/20 - 07/03/20 10 24 17 +/- 8 05/29/20 - 07/03/20 10 25 14 +/- 7 05/29/20 - 07/03/20 10 19 14 +/- 5 05/29/20 - 07/03/20 13 23 17 +/- 8 07/03/20 - 07/31/20 9

30 19 +/- 11 07/03/20 - 07/31/20 13 27 18 +/- 7 07/03/20 - 07/31/20 13 23 18 +/- 5 07/03/20 - 07/31/20 17 26 22 +/- 8 07/31/20 - 09/04/20 10 30 20 +/- 12 07/31/20 - 09/04/20 9

33 18 +/- 12 07/31/20 - 09/04/20 9

28 19 +/- 10 07/31/20 - 09/04/20 13 30 22 +/- 14 09/04/20 - 10/02/20 8

27 16 +/- 11 09/04/20 - 10/02/20 8

26 15 +/- 11 09/04/20 - 10/02/20 8

25 14 +/- 10 09/04/20 - 10/02/20 11 24 16 +/- 12 10/02/20 - 10/30/20 15 25 19 +/- 8 10/02/20 - 10/30/20 11 28 18 +/- 8 10/02/20 - 10/30/20 12 25 18 +/- 8 10/02/20 - 10/30/20 13 25 18 +/- 10 10/30/20 - 12/04/20 18 35 24 +/- 12 10/30/20 - 12/04/20 15 37 23 +/- 10 10/30/20 - 12/04/20 17 31 22 +/- 8 10/30/20 - 12/04/20 21 27 23 +/- 5 12/04/20 - 01/02/21 14 43 27 +/- 21 12/04/20 - 01/02/21 12 39 24 +/- 18 12/04/20 - 01/02/21 13 42 26 +/- 19 12/04/20 - 01/02/21 17 39 27 +/- 19 01/04/20 - 01/02/21 7

43 18 +/- 14 01/04/20 - 01/02/21 6

39 17 +/- 12 01/04/20 - 01/02/21 5

42 17 +/- 12 01/04/20 - 01/02/21 7

39 18 +/- 13 MEAN

+/- 2SD MONTHLY AND YEARLY MEAN VALUES OF GROSS BETA CONCENTRATIONS IN AIR PARTICULATE SAMPLES COLLECTED IN THE VICINITY OF DRESDEN NUCLEAR POWER STATION, 2020 RESULTS IN UNITS OF E-3 PCI/CU METER +/- 2 SIGMA MEAN

+/- 2SD MEAN

+/- 2SD C-9

Table C-V.3 COLLECTION SITE PERIOD Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 Cs-134 Cs-137 Ba-140 La-140 D-01 01/04/20 - 04/03/20

< 2

< 3

< 5

< 2

< 3

< 2

< 9

< 5 04/03/20 - 07/03/20

< 3

< 6

< 3

< 5

< 3

< 5

< 2

< 17

< 8 07/03/20 - 10/02/20

< 3

< 4

< 10

< 4

< 11

< 5

< 7

< 4

< 3

< 33

< 12 10/02/20 - 01/02/21

< 3

< 4

< 9

< 3

< 9

< 4

< 6

< 4

< 18

< 8 MEAN D-02 01/04/20 - 04/03/20

< 2

< 1

< 4

< 2

< 6

< 2

< 4

< 2

< 8

< 6 04/03/20 - 07/03/20

< 2

< 6

< 3

< 1

< 2

< 14

< 7 07/03/20 - 10/02/20

< 2

< 5

< 2

< 6

< 2

< 4

< 2

< 15

< 9 10/02/20 - 01/02/21

< 2

< 4

< 3

< 4

< 2

< 4

< 2

< 8

< 3 MEAN D-03 01/04/20 - 04/03/20

< 2

< 3

< 5

< 2

< 6

< 2

< 4

< 3

< 2

< 13

< 3 04/03/20 - 07/03/20

< 4

< 3

< 10

< 4

< 7

< 4

< 5

< 4

< 3

< 28

< 11 07/03/20 - 10/02/20

< 2

< 6

< 2

< 8

< 3

< 4

< 2

< 16

< 3 10/02/20 - 01/02/21

< 3

< 6

< 3

< 8

< 2

< 4

< 3

< 14

< 5 MEAN D-04 01/04/20 - 04/03/20

< 3

< 6

< 3

< 6

< 2

< 5

< 3

< 2

< 13

< 4 04/03/20 - 07/03/20

< 2

< 3

< 5

< 2

< 5

< 3

< 5

< 2

< 19

< 7 07/03/20 - 10/02/20

< 2

< 6

< 2

< 7

< 2

< 4

< 2

< 18

< 8 10/02/20 - 01/02/21

< 3

< 2

< 5

< 2

< 5

< 3

< 4

< 2

< 12

< 5 MEAN D-07 01/04/20 - 04/03/20

< 2

< 5

< 2

< 5

< 3

< 5

< 3

< 12

< 1 04/03/20 - 07/03/20

< 2

< 6

< 3

< 4

< 2

< 3

< 2

< 13

< 9 07/03/20 - 10/02/20

< 3

< 6

< 3

< 7

< 3

< 5

< 3

< 2

< 21

< 8 10/02/20 - 01/02/21

< 2

< 1

< 4

< 2

< 5

< 2

< 3

< 2

< 8

< 3 MEAN D-08 01/04/20 - 04/03/20

< 1

< 2

< 4

< 2

< 4

< 1

< 3

< 2

< 10

< 4 04/03/20 - 07/03/20

< 4

< 8

< 4

< 9

< 3

< 6

< 3

< 20

< 9 07/03/20 - 10/02/20

< 3

< 6

< 3

< 6

< 3

< 5

< 3

< 2

< 23

< 10 10/02/20 - 01/02/21

< 1

< 4

< 2

< 3

< 2

< 3

< 2

< 1

< 8

< 4 MEAN D-10 01/04/20 - 04/03/20

< 3

< 2

< 4

< 3

< 6

< 2

< 4

< 2

< 3

< 14

< 4 04/03/20 - 07/03/20

< 3

< 2

< 4

< 6

< 3

< 4

< 3

< 2

< 20

< 3 07/03/20 - 10/02/20

< 4

< 11

< 4

< 11

< 5

< 7

< 4

< 30

< 14 10/02/20 - 01/02/21

< 3

< 2

< 5

< 3

< 7

< 2

< 4

< 3

< 15

< 6 MEAN CONCENTRATIONS OF GAMMA EMITTERS IN AIR PARTICULATE SAMPLES COLLECTED IN THE VICINITY OF DRESDEN NUCLEAR POWER STATION, 2020 RESULTS IN UNITS OF E-3 PCI/CU METER +/- 2 SIGMA C-10

Table C-V.3 COLLECTION SITE PERIOD Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 Cs-134 Cs-137 Ba-140 La-140 CONCENTRATIONS OF GAMMA EMITTERS IN AIR PARTICULATE SAMPLES COLLECTED IN THE VICINITY OF DRESDEN NUCLEAR POWER STATION, 2020 RESULTS IN UNITS OF E-3 PCI/CU METER +/- 2 SIGMA D-12 01/04/20 - 04/03/20

< 4

< 9

< 3

< 7

< 3

< 5

< 4

< 17

< 8 04/03/20 - 07/03/20

< 2

< 5

< 2

< 4

< 2

< 3

< 1

< 2

< 12

< 5 07/03/20 - 10/02/20

< 1

< 2

< 6

< 2

< 5

< 3

< 2

< 1

< 18

< 7 10/02/20 - 01/02/21

< 2

< 3

< 7

< 4

< 9

< 3

< 6

< 4

< 3

< 17

< 6 MEAN D-14 01/04/20 - 04/03/20

< 3

< 7

< 5

< 8

< 3

< 6

< 3

< 17

< 6 04/03/20 - 07/03/20

< 4

< 10

< 5

< 8

< 4

< 6

< 3

< 24

< 10 07/03/20 - 10/02/20

< 2

< 4

< 2

< 8

< 2

< 4

< 3

< 2

< 21

< 11 10/02/20 - 01/02/21

< 2

< 4

< 2

< 7

< 3

< 2

< 13

< 5 MEAN D-45 01/04/20 - 04/03/20

< 1

< 2

< 3

< 4

< 2

< 3

< 2

< 11

< 6 04/03/20 - 07/03/20

< 2

< 5

< 3

< 5

< 2

< 4

< 2

< 1

< 14

< 6 07/03/20 - 10/02/20

< 2

< 7

< 3

< 5

< 2

< 4

< 2

< 18

< 8 10/02/20 - 01/02/21

< 2

< 3

< 4

< 2

< 3

< 2

< 9

< 5 MEAN D-53 01/04/20 - 04/03/20

< 3

< 2

< 6

< 2

< 6

< 2

< 4

< 3

< 11

< 7 04/03/20 - 07/03/20

< 3

< 2

< 7

< 3

< 4

< 3

< 5

< 3

< 2

< 20

< 7 07/03/20 - 10/02/20

< 2

< 3

< 6

< 3

< 7

< 3

< 5

< 2

< 3

< 25

< 8 10/02/20 - 01/02/21

< 3

< 6

< 3

< 6

< 3

< 5

< 3

< 2

< 12

< 7 MEAN D-55 01/04/20 - 04/03/20

< 2

< 5

< 1

< 5

< 2

< 3

< 2

< 10

< 2 04/03/20 - 07/03/20

< 2

< 5

< 3

< 4

< 2

< 3

< 2

< 13

< 5 07/03/20 - 10/02/20

< 2

< 5

< 3

< 6

< 3

< 5

< 3

< 2

< 21

< 9 10/02/20 - 01/02/21

< 1

< 2

< 5

< 3

< 5

< 2

< 3

< 2

< 9

< 5 MEAN D-56 01/04/20 - 04/03/20

< 2

< 1

< 4

< 3

< 5

< 1

< 4

< 2

< 12

< 5 04/03/20 - 07/03/20

< 3

< 6

< 3

< 7

< 4

< 7

< 4

< 24

< 13 07/03/20 - 10/02/20

< 2

< 3

< 6

< 2

< 6

< 3

< 4

< 2

< 3

< 21

< 7 10/02/20 - 01/02/21

< 2

< 5

< 3

< 6

< 2

< 4

< 2

< 3

< 12

< 5 MEAN D-58 01/04/20 - 04/03/20

< 2

< 1

< 4

< 2

< 4

< 1

< 3

< 2

< 1

< 8

< 5 04/03/20 - 07/03/20

< 2

< 3

< 2

< 4

< 2

< 4

< 2

< 14

< 8 07/03/20 - 10/02/20

< 2

< 4

< 3

< 4

< 2

< 3

< 2

< 16

< 5 10/02/20 - 01/02/21

< 4

< 7

< 3

< 8

< 3

< 5

< 3

< 18

< 6 MEAN C-11

Table C-VI.1 COLLECTION PERIOD D-01 D-02 D-03 D-04 D-07 D-45 D-53 D-56 D-58 01/04/20 - 01/11/20

< 25

< 24

< 37

< 39

< 16

< 39

< 38 01/11/20 - 01/17/20

< 12

< 24

< 23

< 28

< 24

< 25

< 24 01/17/20 - 01/24/20

< 29

< 27

< 48

< 27

< 22

< 27

< 26 01/24/20 - 01/31/20

< 24

< 28

< 42

< 41

< 42

< 17 01/31/20 - 02/07/20

< 14

< 33

< 23

< 13

< 14

< 13 02/07/20 - 02/14/20

< 14

< 32

< 20

< 49

< 49 02/14/20 - 02/21/20

< 23

< 12

< 36

< 23

< 24

< 23 02/21/20 - 02/28/20

< 37

< 46

< 31

< 30

< 32

< 24 02/28/20 - 03/06/20

< 30

< 28

< 32

< 15

< 32

< 31 03/06/20 - 03/13/20

< 16

< 31

< 28

< 30

< 31

< 30 03/13/20 - 03/20/20

< 33

< 32

< 13

< 17

< 14

< 17

< 16 03/20/20 - 03/27/20

< 28

< 33

< 19

< 26

< 27

< 25 03/27/20 - 04/03/20

< 23

< 22

< 23

< 12

< 19

< 28

< 28 04/03/20 - 04/10/20

< 31

< 21

< 32

< 31

< 32

< 36

< 31

< 31 04/10/20 - 04/17/20

< 18

< 43

< 30

< 28

< 29

< 28 04/17/20 - 04/24/20

< 32

< 31

< 37

< 31

< 32

< 16 04/24/20 - 05/01/20

< 52

< 53

< 52

< 31

< 28

< 27

< 21

< 27 05/01/20 - 05/08/20

< 31

< 30

< 19

< 28

< 29

< 16 05/08/20 - 05/15/20

< 21

< 10

< 13

< 24

< 24 05/15/20 - 05/22/20

< 31

< 17

< 31

< 31 05/22/20 - 05/29/20

< 38

< 39

< 16

< 39

< 30

< 50

< 52

< 50 05/29/20 - 06/05/20

< 42

< 41

< 35

< 25

< 13

< 25

< 24 06/05/20 - 06/12/20

< 44

< 45

< 44

< 19

< 45

< 41

< 24

< 24 06/12/20 - 06/19/20

< 18

< 32

< 57

< 31

< 32

< 31 06/19/20 - 06/26/20

< 28

< 16

< 29

< 30

< 22

< 10

< 22 06/26/20 - 07/03/20

< 20

< 46

< 47

< 49

< 30

< 31

< 30 07/03/20 - 07/10/20

< 44

< 19

< 45

< 44

< 45

< 28

< 18

< 19

< 18 07/10/20 - 07/17/20

< 14

< 25

< 38

< 54

< 53

< 53 07/17/20 - 07/24/20

< 41

< 17

< 41

< 54

< 34

< 34 07/24/20 - 07/31/20

< 34

< 17

< 34

< 38

< 33

< 33 07/31/20 - 08/07/20

< 34

< 35

< 16

< 34

< 35

< 23

< 30

< 30 08/07/20 - 08/14/20

< 32

< 33

< 27

< 33

< 50

< 32

< 32 08/14/20 - 08/21/20

< 21

< 16

< 14

< 33

< 33 08/21/20 - 08/28/20

< 51

< 49

< 51

< 48

< 20

< 48 08/28/20 - 09/04/20

< 63

< 27

< 57

< 68

< 68 09/04/20 - 09/11/20

< 39

< 33

< 15

< 33

< 33 09/11/20 - 09/18/20

< 20

< 48

< 53

< 50

< 50 09/18/20 - 09/25/20

< 61

< 18

< 22

< 22 09/25/20 - 10/02/20

< 29

< 25

< 24

< 23

< 10 10/02/20 - 10/09/20

< 37

< 38

< 39

< 37

< 43

< 40

< 16

< 39

< 39 10/09/20 - 10/16/20

< 23

< 53 (1)

< 54

< 53

< 24

< 30

< 30 10/16/20 - 10/23/20

< 47

< 20 (1)

< 47

< 34

< 21

< 15

< 35 10/23/20 - 10/30/20

< 33 (1)

(1)

< 22

< 33

< 42 (1)

< 20

< 39 10/30/20 - 11/06/20

< 40

< 21

< 40

< 19

< 32

< 31

< 31 11/06/20 - 11/13/20

< 49

< 50

< 49

< 31

< 30

< 29

< 29 11/13/20 - 11/20/20

< 30

< 50

< 33

< 31

< 25

< 30 11/20/20 - 11/27/20

< 49

< 44

< 14

< 31

< 31 11/27/20 - 12/04/20

< 46

< 21

< 30

< 33

< 32

< 32 12/04/20 - 12/11/20

< 33

< 52

< 38

< 36

< 35

< 35 12/11/20 - 12/18/20

< 29

< 44

< 37

< 34

< 28

< 34 12/18/20 - 12/24/20

< 18

< 39

< 18

< 37

< 37 12/24/20 - 01/02/21

< 14

< 15

< 15 MEAN (1) SEE PROGRAM EXCEPTIONS SECTION FOR EXPLANATION GROUP I GROUP II CONCENTRATIONS OF I-131 IN AIR IODINE SAMPLES RESULTS IN UNITS OF E-3 PCI/CU METER + 2 SIGMA COLLECTED IN THE VICINITY OF DRESDEN NUCLEAR POWER STATION, 2020 C-12

Table C-VI.1 CONCENTRATIONS OF I-131 IN AIR IODINE SAMPLES RESULTS IN UNITS OF E-3 PCI/CU METER + 2 SIGMA COLLECTED IN THE VICINITY OF DRESDEN NUCLEAR POWER STATION, 2020 COLLECTION PERIOD D-08 D-10 D-14 D-55 D-12 01/04/20 - 01/11/20

< 37

< 16

< 37

< 39

< 38 01/11/20 - 01/17/20

< 27

< 14

< 28

< 25

< 28 01/17/20 - 01/24/20

< 48

< 20

< 27

< 48 01/24/20 - 01/31/20

< 28

< 29

< 42

< 33 01/31/20 - 02/07/20

< 22

< 23

< 14

< 14 02/07/20 - 02/14/20

< 47

< 50

< 47 02/14/20 - 02/21/20

< 15

< 35

< 36

< 23

< 35 02/21/20 - 02/28/20

< 46

< 20

< 31

< 47 02/28/20 - 03/06/20

< 29

< 28

< 20

< 32

< 29 03/06/20 - 03/13/20

< 28

< 19

< 31

< 28 03/13/20 - 03/20/20

< 28

< 29

< 17

< 29 03/20/20 - 03/27/20

< 19

< 26

< 19 03/27/20 - 04/03/20

< 18

< 16

< 28

< 18 04/03/20 - 04/10/20

< 36

< 17

< 36

< 32

< 36 04/10/20 - 04/17/20

< 30

< 31

< 28

< 45 04/17/20 - 04/24/20

< 37

< 16

< 31

< 38 04/24/20 - 05/01/20

< 31

< 27

< 31 05/01/20 - 05/08/20

< 25

< 28

< 25 05/08/20 - 05/15/20

< 17

< 24

< 17 05/15/20 - 05/22/20

< 31

< 21

< 31 05/22/20 - 05/29/20

< 30

< 51

< 17 05/29/20 - 06/05/20

< 35

< 15

< 24

< 35 06/05/20 - 06/12/20

< 41

< 17

< 41

< 25

< 41 06/12/20 - 06/19/20

< 57

< 32

< 24 06/19/20 - 06/26/20

< 17

< 30

< 23

< 30 06/26/20 - 07/03/20

< 48

< 50

< 31

< 22 07/03/20 - 07/10/20

< 28

< 19

< 16 07/10/20 - 07/17/20

< 38

< 16

< 54

< 38 07/17/20 - 07/24/20

< 53

< 54

< 35

< 22 07/24/20 - 07/31/20

< 38

< 18

< 34

< 38 07/31/20 - 08/07/20

< 23

< 18

< 31

< 23 08/07/20 - 08/14/20

< 50

< 51

< 32

< 21 08/14/20 - 08/21/20

< 30

< 33

< 30 08/21/20 - 08/28/20

< 49

< 21

< 50

< 49

< 49 08/28/20 - 09/04/20

< 58

< 57

< 25

< 70

< 58 09/04/20 - 09/11/20

< 28

< 29

< 34

< 29 09/11/20 - 09/18/20

< 53

< 52

< 22

< 50

< 53 09/18/20 - 09/25/20

< 42

< 43

< 22

< 43 09/25/20 - 10/02/20

< 25

< 24

< 12

< 24

< 25 10/02/20 - 10/09/20

< 43

< 44

< 40

< 18 10/09/20 - 10/16/20

< 55

< 24

< 29

< 24 10/16/20 - 10/23/20

< 47

< 32

< 33

< 36

< 32 10/23/20 - 10/30/20

< 33

< 40

< 33 10/30/20 - 11/06/20

< 36

< 38

< 32

< 36 11/06/20 - 11/13/20

< 31

< 16

< 24

< 31 11/13/20 - 11/20/20

< 50

< 23

< 31

< 50 11/20/20 - 11/27/20

< 44

< 20

< 32

< 44 11/27/20 - 12/04/20

< 21

< 23

< 33

< 21 12/04/20 - 12/11/20

< 52

< 22

< 18

< 52 12/11/20 - 12/18/20

< 44

< 19

< 34

< 44 12/18/20 - 12/24/20

< 39

< 21

< 38

< 39 12/24/20 - 01/02/21

< 33

< 35

< 40

< 33 MEAN GROUP IV GROUP III C-13

Table C-VII.1 COLLECTION CONTROL FARM PERIOD 01/02/20

< 0.6 02/06/20

< 0.7 03/04/20

< 0.9 04/01/20

< 0.5 05/01/20

< 0.7 05/06/20

< 0.9 05/21/20

< 0.9 06/03/20

< 0.9 06/18/20

< 0.9 07/01/20

< 0.7 07/16/20

< 0.9 07/29/20

< 0.7 08/13/20

< 0.9 08/27/20

< 0.9 09/10/20

< 0.9 09/24/20

< 0.9 10/07/20

< 0.8 10/22/20

< 0.8 11/04/20

< 0.9 MEAN D-25 THE VICINITY OF DRESDEN NUCLEAR POWER STATION, 2020 RESULTS IN UNITS OF PCI/LITER + 2 SIGMA CONCENTRATIONS OF I-131 IN MILK SAMPLES COLLECTED IN C-14

Table C-VII.2 COLLECTION SITE PERIOD Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 Cs-134 Cs-137 Ba-140 La-140 D-25 01/02/20

< 8

< 18

< 8

< 17

< 8

< 14

< 9

< 8

< 30

< 7 02/06/20

< 7

< 11

< 7

< 15

< 6

< 10

< 7

< 6

< 22

< 10 03/04/20

< 8

< 7

< 19

< 8

< 17

< 8

< 13

< 10

< 9

< 38

< 11 04/01/20

< 4

< 9

< 5

< 10

< 5

< 8

< 5

< 18

< 6 05/01/20

< 5

< 7

< 17

< 8

< 13

< 6

< 13

< 8

< 30

< 10 05/06/20

< 8

< 17

< 11

< 17

< 9

< 16

< 8

< 9

< 33

< 12 05/21/20

< 7

< 8

< 22

< 6

< 18

< 8

< 14

< 7

< 8

< 36

< 12 06/03/20

< 8

< 7

< 18

< 9

< 20

< 9

< 11

< 9

< 8

< 33

< 13 06/18/20

< 8

< 20

< 8

< 20

< 8

< 12

< 9

< 8

< 33

< 9 07/01/20

< 6

< 14

< 11

< 13

< 7

< 12

< 7

< 6

< 25

< 7 07/16/20

< 7

< 10

< 15

< 8

< 20

< 9

< 13

< 10

< 8

< 35

< 8 07/29/20

< 7

< 9

< 13

< 10

< 17

< 8

< 16

< 10

< 8

< 39

< 10 08/13/20

< 8

< 7

< 16

< 10

< 19

< 9

< 15

< 8

< 7

< 43

< 10 08/27/20

< 6

< 9

< 21

< 6

< 19

< 7

< 15

< 8

< 7

< 35

< 9 09/10/20

< 8

< 12

< 7

< 15

< 8

< 12

< 8

< 7

< 25

< 11 09/24/20

< 9

< 8

< 21

< 7

< 22

< 8

< 14

< 10

< 8

< 38

< 12 10/07/20

< 9

< 16

< 10

< 17

< 9

< 15

< 9

< 10

< 34

< 11 10/22/20

< 8

< 19

< 8

< 21

< 8

< 13

< 10

< 9

< 30

< 11 11/04/20

< 5

< 6

< 11

< 6

< 13

< 6

< 10

< 7

< 6

< 26

< 8 MEAN CONCENTRATIONS OF GAMMA EMITTERS IN MILK SAMPLES COLLECTED IN THE VICINITY OF DRESDEN NUCLEAR POWER STATION, 2020 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA C-15

Table C-VIII.1 COLLECTION SITE PERIOD Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 I-131 Cs-134 Cs-137 Ba-140 La-140 D-25 Swiss Chard 07/10/20

< 37

< 72

< 34

< 84

< 40

< 56

< 54

< 45

< 42

< 151

< 49 Turnip 07/10/20

< 30

< 24

< 63

< 30

< 68

< 30

< 52

< 37

< 31

< 28

< 96

< 40 Collards 07/10/20

< 29

< 23

< 48

< 28

< 63

< 29

< 46

< 34

< 32

< 108

< 25 Turnip 08/14/20

< 25

< 32

< 66

< 30

< 63

< 32

< 53

< 44

< 38

< 31

< 145

< 36 Swiss Chard 08/14/20

< 45

< 41

< 74

< 39

< 92

< 45

< 74

< 56

< 39

< 36

< 204

< 47 Collard Greens 08/14/20

< 38

< 39

< 74

< 35

< 92

< 43

< 69

< 56

< 41

< 42

< 147

< 45 Swiss Chard 09/11/20

< 33

< 31

< 57

< 39

< 83

< 40

< 56

< 37

< 40

< 33

< 146

< 39 Collards 09/11/20

< 30

< 31

< 64

< 40

< 65

< 29

< 57

< 38

< 34

< 31

< 119

< 32 Turnips 09/11/20

< 27

< 24

< 70

< 31

< 64

< 29

< 48

< 37

< 33

< 31

< 108

< 32 Swiss Chard 10/09/20

< 16

< 36

< 18

< 39

< 16

< 27

< 21

< 17

< 18

< 66

< 16 Collards 10/09/20

< 31

< 36

< 60

< 34

< 78

< 30

< 49

< 41

< 32

< 38

< 128

< 24 Turnip 10/09/20

< 18

< 37

< 19

< 42

< 17

< 32

< 22

< 18

< 20

< 69

< 22 MEAN D-40 Swiss Chard 08/14/20

< 13

< 29

< 14

< 28

< 13

< 22

< 18

< 13

< 15

< 57

< 14 Turnip 08/14/20

< 28

< 57

< 35

< 52

< 28

< 40

< 38

< 30

< 26

< 113

< 28 Collard Greens 08/14/20

< 23

< 18

< 52

< 32

< 53

< 28

< 30

< 41

< 25

< 26

< 94

< 24 Turnips 09/11/20

< 26

< 24

< 55

< 31

< 52

< 29

< 40

< 31

< 33

< 103

< 34 Kale 09/11/20

< 21

< 34

< 47

< 45

< 81

< 35

< 54

< 36

< 42

< 37

< 136

< 34 Collards 09/11/20

< 30

< 29

< 60

< 28

< 60

< 30

< 52

< 38

< 29

< 28

< 117

< 34 Turnip 10/09/20

< 36

< 37

< 76

< 30

< 76

< 37

< 69

< 55

< 46

< 38

< 131

< 22 Kale 10/09/20

< 27

< 51

< 26

< 61

< 26

< 47

< 34

< 26

< 24

< 123

< 22 Collards 10/09/20

< 32

< 25

< 59

< 30

< 60

< 24

< 48

< 37

< 35

< 22

< 88

< 38 MEAN D-41 Collard Greens 08/14/20

< 19

< 20

< 38

< 22

< 42

< 20

< 33

< 27

< 22

< 21

< 78

< 26 Collards 09/11/20

< 30

< 36

< 44

< 36

< 81

< 33

< 58

< 42

< 35

< 32

< 137

< 35 Swiss Chard 09/11/20

< 37

< 86

< 44

< 93

< 38

< 78

< 49

< 52

< 33

< 157

< 48 Kale 09/11/20

< 40

< 37

< 85

< 42

< 90

< 43

< 70

< 58

< 41

< 50

< 181

< 63 Collards 10/09/20

< 20

< 17

< 38

< 24

< 36

< 18

< 28

< 19

< 18

< 19

< 71

< 18 Swiss Chard 10/09/20

< 19

< 38

< 23

< 42

< 19

< 31

< 23

< 19

< 74

< 21 MEAN COLLECTED IN THE VICINITY OF DRESDEN NUCLEAR POWER STATION, 2020 CONCENTRATIONS OF GAMMA EMITTERS IN VEGETATION SAMPLES RESULTS IN UNITS OF PCI/KG WET +/- 2 SIGMA C-16

Table C-VIII.1 COLLECTION SITE PERIOD Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 I-131 Cs-134 Cs-137 Ba-140 La-140 COLLECTED IN THE VICINITY OF DRESDEN NUCLEAR POWER STATION, 2020 CONCENTRATIONS OF GAMMA EMITTERS IN VEGETATION SAMPLES RESULTS IN UNITS OF PCI/KG WET +/- 2 SIGMA D-42 Kale 07/10/20

< 35

< 39

< 82

< 42

< 74

< 38

< 61

< 55

< 36

< 37

< 143

< 54 Cabbage 07/10/20

< 21

< 29

< 47

< 28

< 49

< 31

< 41

< 39

< 26

< 28

< 126

< 46 Swiss Chard 07/10/20

< 39

< 34

< 66

< 45

< 84

< 35

< 62

< 51

< 37

< 43

< 137

< 60 Kohlrabi 07/10/20

< 39

< 41

< 82

< 34

< 56

< 37

< 62

< 54

< 35

< 41

< 178

< 36 Turnip 08/14/20

< 32

< 29

< 67

< 37

< 70

< 28

< 60

< 36

< 27

< 34

< 122

< 43 Kale 08/14/20

< 38

< 36

< 76

< 39

< 87

< 41

< 72

< 56

< 39

< 45

< 161

< 44 Cabbage 08/14/20

< 37

< 36

< 54

< 32

< 62

< 37

< 70

< 44

< 34

< 36

< 138

< 39 Turnip 09/11/20

< 27

< 28

< 48

< 31

< 59

< 30

< 37

< 30

< 26

< 134

< 18 Kale 09/11/20

< 32

< 23

< 62

< 20

< 58

< 25

< 42

< 29

< 32

< 131

< 36 Swiss Chard 09/11/20

< 36

< 34

< 67

< 33

< 68

< 31

< 61

< 53

< 36

< 42

< 141

< 44 Cabbage 09/11/20

< 15

< 17

< 29

< 16

< 29

< 19

< 30

< 23

< 15

< 19

< 71

< 17 Kohlrabi 09/11/20

< 15

< 14

< 35

< 13

< 22

< 14

< 23

< 21

< 13

< 15

< 60

< 16 Turnip 10/09/20

< 19

< 22

< 52

< 24

< 55

< 20

< 34

< 26

< 25

< 22

< 69

< 23 Kale 10/09/20

< 14

< 17

< 31

< 18

< 33

< 16

< 27

< 19

< 17

< 16

< 62

< 17 Cabbage 10/09/20

< 24

< 30

< 59

< 29

< 62

< 30

< 53

< 34

< 28

< 34

< 93

< 43 Kohlrabi 10/09/20

< 16

< 17

< 37

< 19

< 39

< 17

< 28

< 26

< 19

< 82

< 11 MEAN D-43 Turnip 08/14/20

< 30

< 31

< 49

< 38

< 71

< 33

< 55

< 45

< 35

< 31

< 142

< 45 Collard green 08/14/20

< 35

< 33

< 74

< 39

< 73

< 30

< 55

< 41

< 37

< 30

< 149

< 38 Swiss Chard 08/14/20

< 36

< 35

< 78

< 48

< 80

< 35

< 64

< 48

< 36

< 40

< 132

< 61 Swiss Chard 09/11/20

< 34

< 30

< 67

< 33

< 58

< 34

< 66

< 44

< 36

< 34

< 138

< 41 Turnip 09/11/20

< 21

< 46

< 26

< 54

< 25

< 47

< 27

< 19

< 86

< 19 Collards 09/11/20

< 26

< 23

< 55

< 27

< 50

< 25

< 38

< 29

< 24

< 23

< 107

< 27 Turnip 10/09/20

< 34

< 68

< 39

< 74

< 32

< 57

< 37

< 36

< 32

< 111

< 25 Collards 10/09/20

< 24

< 21

< 51

< 29

< 60

< 25

< 45

< 31

< 25

< 23

< 106

< 29 Swiss Chard 10/09/20

< 28

< 40

< 74

< 44

< 98

< 34

< 60

< 36

< 40

< 37

< 154

< 42 MEAN D-44 Swiss Chard 07/10/20

< 37

< 36

< 69

< 41

< 67

< 33

< 48

< 40

< 34

< 36

< 133

< 34 Collards 07/10/20

< 26

< 27

< 56

< 31

< 62

< 27

< 41

< 35

< 27

< 28

< 104

< 35 Turnips 07/10/20

< 24

< 21

< 42

< 26

< 60

< 24

< 22

< 28

< 25

< 94

< 25 Swiss Chard 08/14/20

< 35

< 36

< 100

< 39

< 73

< 28

< 55

< 47

< 42

< 38

< 139

< 46 Turnip 08/14/20

< 16

< 15

< 30

< 16

< 37

< 16

< 30

< 22

< 18

< 16

< 62

< 18 Collard Greens 08/14/20

< 25

< 26

< 81

< 38

< 69

< 36

< 57

< 41

< 34

< 30

< 137

< 56 Kale 08/14/20

< 26

< 31

< 53

< 25

< 63

< 30

< 55

< 41

< 23

< 31

< 124

< 39 Turnip 09/11/20

< 28

< 23

< 49

< 30

< 49

< 27

< 45

< 29

< 25

< 28

< 90

< 36 Collards 09/11/20

< 26

< 30

< 77

< 35

< 81

< 28

< 44

< 28

< 31

< 27

< 125

< 25 Kale 09/11/20

< 25

< 26

< 45

< 26

< 61

< 27

< 48

< 37

< 33

< 28

< 130

< 24 Swiss Chard 09/11/20

< 38

< 26

< 62

< 29

< 76

< 29

< 41

< 42

< 37

< 31

< 115

< 38 Turnip 10/09/20

< 19

< 16

< 37

< 21

< 41

< 18

< 31

< 22

< 21

< 17

< 75

< 20 Collards 10/09/20

< 27

< 25

< 60

< 30

< 64

< 30

< 49

< 40

< 28

< 35

< 116

< 29 Kale 10/09/20

< 16

< 15

< 33

< 17

< 36

< 16

< 28

< 21

< 17

< 16

< 65

< 18 Swiss Chard 10/09/20

< 18

< 17

< 37

< 20

< 43

< 17

< 31

< 23

< 20

< 17

< 74

< 19 MEAN C-17

1 2

3 4

D-01 27.7 40.5 15 22 24 20 111 155 81 ND D-02 28.8 41.6 15 21 21 17 115 160 75 ND D-03 23.9 36.7 14 21 21 19 96 140 75 ND D-04 27.4 40.2 16 21 24 19 110 154 79 ND D-07 26.7 39.5 16 23 25 21 107 151 85 ND D-08 24.4 37.2 15 21 23 20 98 142 79 ND D-10 28.6 41.4 16 22 24 19 115 159 80 ND D-12 23.7 36.5 14 21 23 18 90 135 75 ND D-14 23.5 36.3 14 21 19 18 94 138 72 ND D-45 23.2 36.0 17 24 25 22 93 137 87 ND D-53 27.5 40.3 15 20 21 17 110 154 73 ND D-55 27.2 40.0 15 22 23 19 109 153 80 ND D-56 25.3 38.1 12 18 19 16 101 146 64 ND D-58 26.5 39.3 10 17 18 17 106 150 63 ND D-101 26.6 39.4 16 23 24 21 107 151 84 ND D-102 28.6 41.4 19 24 25 21 114 159 90 ND D-103 26.4 39.2 15 23 23 19 106 150 79 ND D-104 28.3 41.1 17 22 25 21 107 152 86 ND D-105 27.1 39.9 18 22 24 20 109 153 84 ND D-106 24.1 36.9 11 16 19 15 92 136 61 ND D-107 23.8 36.6 11 17 18 16 95 140 62 ND D-108 26.8 39.6 14 20 24 19 107 152 77 ND D-109 27.0 39.8 15 22 24 19 108 153 79 ND D-110 31.1 43.9 19 25 27 22 125 169 93 ND D-111 28.6 41.4 17 23 25 20 103 148 85 ND D-112A 25.3 38.1 14 19 22 17 101 146 72 ND D-113 25.1 37.9 15 20 23 19 96 140 77 ND D-114 24.6 37.4 14 19 21 17 98 143 70 ND D-115 27.5 40.3 16 21 23 20 110 155 80 ND D-116 29.4 42.2 18 22 27 22 118 162 88 ND D-201 30.8 43.6 17 24 26 21 111 155 88 ND D-202 27.6 40.4 17 21 25 21 105 149 84 ND D-203 26.2 39.0 14 18 22 17 94 139 71 ND D-204 24.4 37.2 13 18 20 16 98 142 67 ND D-205 23.3 36.1 18 21 23 20 93 138 82 ND D-206 26.6 39.4 14 22 22 19 101 146 77 ND D-207 24.8 37.6 13 19 19 16 99 144 67 ND D-208 23.0 35.8 12 17 18 16 92 136 63 ND D-209 23.1 35.9 12 17 17 15 92 137 61 ND D-210 26.1 38.9 15 21 21 19 105 149 76 ND D-211 27.7 40.5 17 23 25 19 111 155 84 ND D-212 24.5 37.3 13 18 19 16 98 142 66 ND D-213 23.1 35.9 12 18 19 16 93 137 65 ND D-214 31.0 43.8 16 22 25 19 124 168 83 ND D-215 29.9 42.7 18 23 28 21 120 164 91 ND D-216 28.0 40.8 16 22 22 19 106 151 80 ND Table C-IX.1 QUARTERLY DLR RESULTS FOR DRESDEN NUCLEAR POWER STATION, 2020 (2) Minimum differential dose (MDDA): The smallest amount of facility related dose at each monitored location annually above the baseline background dose that can be reliably detected by an environmental dosimetry system BA +

MDDA (2)

(mrem)

Annual Facility Dose, FA (mrem)

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

Baseline, BQ (mrem)

BQ +

MDDQ (mrem)

Normalized Net Dose, MQX (mrem/std. Qtr.)

Normalized Dose, MA (mrem/yr)

Annual

Baseline, BA (1)

(mrem)

C-18

DUE TO VENDOR CHANGE IN 2005, < VALUES ARE LLD VALUES JANUARY THROUGH JUNE 2005 AND MDC VALUES AFTER JULY 2005 FIGURE C-1 SURFACE WATER - GROSS BETA - STATION D-52 (C)

COLLECTED IN THE VICINITY OF DNPS, 2000 - 2020 0

2 4

6 8

10 12 14 16 01-28-00 04-21-05 07-14-10 10-06-15 12-28-20 pCi/L D-52 (C) DesPlaines River at Will Road C-19

DUE TO VENDOR CHANGE IN 2005, < VALUES ARE LLD VALUES JANUARY THROUGH JUNE 2005 AND MDC VALUES AFTER JULY 2005 D-54 LOCATION REMOVED FROM PROGRAM JUNE 28, 2007 AND REPLACED WITH D-57 FIGURE C-2 SURFACE WATER - GROSS BETA - STATION D-57 (C)

COLLECTED IN THE VICINITY OF DNPS, 2006 - 2020 0

4 8

12 16 20 24 28 32 07-28-06 03-05-10 10-11-13 05-19-17 12-25-20 pCi/L D-57 (C) Kankakee River at Will Road C-20

D-21 PLACED INTO SERVICE ON MARCH 30, 2007, REPLACED D-51 FIGURE C-3 SURFACE WATER - GROSS BETA - STATION D-21 COLLECTED IN THE VICINITY OF DNPS, 2000 - 2020 0

5 10 15 20 25 30 04-27-07 09-27-10 02-27-14 07-30-17 12-30-20 pCi/L D-21 Illinois River at EJ&E Bridge C-21

DUE TO VENDOR CHANGE IN 2005, < VALUES ARE LLD VALUES JANUARY THROUGH JUNE 2005 AND MDC VALUES AFTER JULY 2005 FIGURE C-4 SURFACE WATER - TRITIUM - STATION D-52 (C)

COLLECTED IN THE VICINITY OF DNPS, 2000 - 2020 0

100 200 300 400 500 600 03-31-00 06-07-05 08-14-10 10-21-15 12-27-20 pCi/L D-52 (C) Des Plaines River at Will Road C-22

DUE TO VENDOR CHANGE IN 2005, < VALUES ARE LLD VALUES JANUARY THROUGH JUNE 2005 AND MDC VALUES AFTER JULY 2005 FIGURE C-5 SURFACE WATER - TRITIUM - STATION D-57 (C)

COLLECTED IN THE VICINITY OF DNPS, 2006 - 2020 0

1000 2000 3000 4000 5000 6000 7000 12-20-06 03-24-10 06-26-13 09-28-16 01-01-20 pCi/L D-57 (C) Kankakee River at Will Road C-23

D-21 REPLACED D-51 JUNE 29, 2007 FIGURE C-6 SURFACE WATER - TRITIUM - STATION D-21 COLLECTED IN THE VICINITY OF DNPS, 2007 - 2020 0

200 400 600 800 1000 1200 06-29-07 11-12-10 03-28-14 08-11-17 12-25-20 pCi/L D-21 Illinois River at EJ&E Bridge C-24

DUE TO VENDOR CHANGE IN 2005, < VALUES ARE LLD VALUES JANUARY THROUGH JUNE 2005 AND MCD VALUES AFTER JULY 2005 FIGURE C-7 GROUND WATER - TRITIUM - STATIONS D-23 and D-35 COLLECTED IN THE VICINITY OF DNPS, 2000 - 2020 0

200 400 600 800 1000 01-01-00 01-03-05 01-06-10 01-09-15 01-12-20 pCi/L D-23 Thorsen Well 0

50 100 150 200 250 300 350 400 01-01-00 03-15-05 05-28-10 08-10-15 10-22-20 pCi/L D-35 Dresden Lock and Dam C-25

FIGURE C-8 GROUND WATER - TRITIUM - STATIONS D-22 and D-24 COLLECTED IN THE VICINITY OF DNPS, 2020 0

200 400 01-01-20 03-01-20 04-30-20 06-29-20 08-28-20 10-27-20 pCi/L D-22 Thorsen Road Well 0

200 400 01-01-20 03-01-20 04-30-20 06-29-20 08-28-20 10-27-20 pCi/L D-22 Thorsen Road Well C-26

D-02 No samples; power was restored on 09-16-05.

FIGURE C-9 AIR PARTICULATES - GROSS BETA - STATIONS D-01 and D-02 COLLECTED IN THE VICINITY OF DNPS, 2000 - 2020 0.0 10.0 20.0 30.0 40.0 50.0 01-08-00 04-08-05 07-08-10 10-07-15 01-05-21 10E-03 pCi/m3 D-01 Onsite Station 1 0.0 10.0 20.0 30.0 40.0 50.0 01-08-00 04-08-05 07-08-10 10-07-15 01-05-21 10E-03 pCi/m3 D-02 Onsite Station 2 C-27

D-03 No samples; power was restored on 07-04-14.

FIGURE C-10 AIR PARTICULATES - GROSS BETA - STATIONS D-03 and D-04 COLLECTED IN THE VICINITY OF DNPS, 2000 - 2020 0.0 10.0 20.0 30.0 40.0 50.0 60.0 01-08-00 04-08-05 07-08-10 10-07-15 01-05-21 10E-03 pCi/m3 D-04 Collins Road on Station Property 0.0 10.0 20.0 30.0 40.0 50.0 60.0 01-08-00 04-08-05 07-08-10 10-07-15 01-05-21 10E-03 pCi/m3 D-03 Onsite Station 3 C-28

FIGURE C-11 AIR PARTICULATES - GROSS BETA - STATIONS D-07 and D-12 (C) COLLECTED IN THE VICINITY OF DNPS, 2000 - 2020 0.0 20.0 40.0 60.0 80.0 100.0 120.0 01-08-00 04-08-05 07-08-10 10-07-15 01-05-21 10E-03 pCi/m3 D-07 Clay Products, Dresden Road 0.0 20.0 40.0 60.0 80.0 01-08-00 04-08-05 07-08-10 10-07-15 01-05-21 10E-03 pCi/m3 D-12 (C), Quarry Road, Lisbon C-29

FIGURE C-12 AIR PARTICULATES - GROSS BETA - STATIONS D-45 and D-53 COLLECTED IN THE VICINITY OF DNPS, 2000 - 2020 0.0 10.0 20.0 30.0 40.0 50.0 60.0 70.0 01-08-00 04-08-05 07-08-10 10-07-15 01-05-21 10E-03 pCi/m3 D-45 McKinley Woods Road, Channahon 0.0 10.0 20.0 30.0 40.0 50.0 01-08-00 04-08-05 07-08-10 10-07-15 01-05-21 10E-03 pCi/m3 D-53 Will Road, Hollyhock C-30

FIGURE C-13 AIR PARTICULATES - GROSS BETA - STATIONS D-08 and D-10 COLLECTED IN THE VICINITY OF DNPS, 2005 - 2020 0.0 10.0 20.0 30.0 40.0 50.0 60.0 70.0 01-07-05 05-08-10 09-06-15 01-04-21 10E-03 pCi/m3 D-08 Jugtown Road, Prairie Parks 0.0 10.0 20.0 30.0 40.0 50.0 60.0 01-07-05 05-08-10 09-06-15 01-04-21 10E-03 pCi/m3 D-10 Goose Lake Road, Goose Lake Village C-31

FIGURE C-14 AIR PARTICULATES - GROSS BETA - STATION D-14 COLLECTED IN THE VICINITY OF DNPS, 2005 - 2020 0.0 10.0 20.0 30.0 40.0 50.0 01-07-05 01-06-09 01-05-13 01-04-17 01-03-21 10E-03 pCi/m3 D-14 Center Street, Channahon C-32

D-55 NEW STATION DECEMBER 30, 2005 REPLACED D-13 JUNE 29, 2007 D-56 NEW STATION JULY 25, 2006 FIGURE C-15 AIR PARTICULATES - GROSS BETA - STATIONS D-55 and D-56 COLLECTED IN THE VICINITY OF DNPS, 2006 - 2020 0.0 10.0 20.0 30.0 40.0 50.0 60.0 70.0 01-06-06 10-06-09 07-06-13 04-05-17 01-03-21 10E-03 pCi/m3 D-55 Ridge Road, Minooka 0.0 10.0 20.0 30.0 40.0 50.0 07-25-06 03-05-10 10-14-13 05-25-17 01-03-21 10E-03 pCi/m3 D-56 Will Road, Wildfeather C-33

D-58 NEW STATION IN MAY OF 2011 FIGURE C-16 AIR PARTICULATES - GROSS BETA - STATION D-58 COLLECTED IN THE VICINITY OF DNPS, 2011 - 2020 0.0 10.0 20.0 30.0 40.0 50.0 60.0 06-03-11 10-26-13 03-20-16 08-13-18 01-05-21 10E-03 pCi/m3 D-58 Will Road Marina C-34

APPENDIX D INTER-LABORATORY COMPARISON PROGRAM

Intentionally left blank

Month/Year Identification Number Matrix Nuclide Units TBE Value Known Value (a)

Ratio of TBE to Known Result Evaluation (b)

September 2020 E13247 Milk Sr-89 pCi/L 62.8 95.4 0.66 N(1)

Sr-90 pCi/L 12.0 12.8 0.94 A

E13248 Milk Ce-141 pCi/L 156 150 1.04 A

Co-58 pCi/L 172 180 0.96 A

Co-60 pCi/L 369 379 0.97 A

Cr-51 pCi/L 372 372 1.00 A

Cs-134 pCi/L 171 200 0.85 A

Cs-137 pCi/L 241 250 0.96 A

Fe-59 pCi/L 217 200 1.08 A

I-131 pCi/L 84.6 95.0 0.89 A

Mn-54 pCi/L 175 180 0.97 A

Zn-65 pCi/L 252 270 0.93 A

E13249 Charcoal I-131 pCi 70.2 75.8 0.93 A

E13250 AP Ce-141 pCi 101 101 1.00 A

Co-58 pCi 111 120 0.92 A

Co-60 pCi 249 254 0.98 A

Cr-51 pCi 287 249 1.15 A

Cs-134 pCi 114 134 0.85 A

Cs-137 pCi 159 168 0.95 A

Fe-59 pCi 127 134 0.95 A

Mn-54 pCi 114 121 0.94 A

Zn-65 pCi 168 181 0.93 A

E13251 Soil Ce-141 pCi/g 0.241 0.191 1.26 W

Co-58 pCi/g 0.211 0.228 0.93 A

Co-60 pCi/g 0.466 0.481 0.97 A

Cr-51 pCi/g 0.450 0.472 0.95 A

Cs-134 pCi/g 0.273 0.254 1.07 A

Cs-137 pCi/g 0.370 0.390 0.95 A

Fe-59 pCi/g 0.233 0.254 0.92 A

Mn-54 pCi/g 0.217 0.229 0.95 A

Zn-65 pCi/g 0.368 0.343 1.07 A

E13252 AP Sr-89 pCi 79.9 100.0 0.80 A

Sr-90 pCi 12.1 13.4 0.90 A

(a) The Analytics known value is equal to 100% of the parameter present in the standard as determined by gravimetric and/or volumetric measurements made during standard preparation (b)

Analytics evaluation based on TBE internal QC limits:

A = Acceptable - reported result falls within ratio limits of 0.80-1.20 W = Acceptable with warning - reported result falls within 0.70-0.80 or 1.20-1.30 N = Not Acceptable - reported result falls outside the ratio limits of < 0.70 and > 1.30 (1) See NCR 20-19 Analytics Environmental Radioactivity Cross Check Program Teledyne Brown Engineering Environmental Services (Page 1 of 2)

Table D-1 D-1

Month/Year Identification Number Matrix Nuclide Units TBE Value Known Value (a)

Ratio of TBE to Known Result Evaluation (b)

Analytics Environmental Radioactivity Cross Check Program Teledyne Brown Engineering Environmental Services December 2020 E13254 Milk Sr-89 pCi/L 82.2 89.7 0.92 A

Sr-90 pCi/L 12.4 13.0 0.96 A

E13255 Milk Ce-141 pCi/L 91.1 100 0.91 A

Co-58 pCi/L 77.5 84.3 0.92 A

Co-60 pCi/L 147 152 0.97 A

Cr-51 pCi/L 259 253 1.02 A

Cs-134 pCi/L 97.1 108 0.90 A

Cs-137 pCi/L 117 127 0.92 A

Fe-59 pCi/L 114 112 1.02 A

I-131 pCi/L 84.3 91.9 0.92 A

Mn-54 pCi/L 137 143 0.96 A

Zn-65 pCi/L 175 190 0.92 A

E13256 Charcoal I-131 pCi 70.2 78.2 0.90 A

E13257A AP Ce-141 pCi 67.4 74.6 0.90 A

Co-58 pCi 57.9 62.9 0.92 A

Co-60 pCi 108 113 0.95 A

Cr-51 pCi 162 189 0.86 A

Cs-134 pCi 68.1 80.4 0.85 A

Cs-137 pCi 82.4 95.0 0.87 A

Fe-59 pCi 80.5 83.7 0.96 A

Mn-54 pCi 102 107 0.95 A

Zn-65 pCi 115 142 0.81 A

E13258 Soil Ce-141 pCi/g 0.167 0.170 0.98 A

Co-58 pCi/g 0.125 0.143 0.87 A

Co-60 pCi/g 0.245 0.257 0.95 A

Cr-51 pCi/g 0.393 0.429 0.92 A

Cs-134 pCi/g 0.147 0.183 0.80 A

Cs-137 pCi/g 0.260 0.288 0.90 A

Fe-59 pCi/g 0.199 0.190 1.05 A

Mn-54 pCi/g 0.229 0.243 0.94 A

Zn-65 pCi/g 0.320 0.322 0.99 A

E13259 AP Sr-89 pCi 85.0 78.6 1.08 A

Sr-90 pCi 13.1 11.4 1.15 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 D-1 D-2

Month/Year Identification Number Matrix Nuclide Units TBE Value Known Value (a)

Acceptance Range Evaluation (b)

February 2020 20-GrF42 AP Gross Alpha Bq/sample 0.676 1.24 0.37 - 2.11 A

Gross Beta Bq/sample 2.03 2.00 1.00 - 3.00 A

20-MaS42 Soil Ni-63 Bq/kg 0.01 (1)

A Sr-90 Bq/kg 348 340 238 - 442 A

20-MaW42 Water Ni-63 Bq/L 11.6 11.1 7.8 - 14.4 A

Pu-238 Bq/L 0.926 0.94 0.66 - 1.22 A

Pu-239/240 Bq/L 0.712 0.737 0.516 - 0.958 A

20-RdF42 AP U-234/233 Bq/sample 0.0416 0.075 0.053 - 0.098 N(3)

U-238 Bq/sample 0.0388 0.078 0.055 - 0.101 N(3) 20-RdV42 Vegetation Cs-134 Bq/sample 3.23 3.82 2.67 - 4.97 A

Cs-137 Bq/sample 2.64 2.77 1.94 - 3.60 A

Co-57 Bq/sample 0.0281 (1)

A Co-60 Bq/sample 2.62 2.79 1.95 - 3.63 A

Mn-54 Bq/sample 4.3 4.58 3.21 - 5.95 A

Sr-90 Bq/sample 0.396 0.492 0.344 - 0.640 A

Zn-65 Bq/sample 3.93 3.79 2.65 - 4.93 A

August 2020 20-GrF43 AP Gross Alpha Bq/sample 0.267 0.528 0.158 - 0.898 A

Gross Beta Bq/sample 0.939 0.915 0.458 - 1.373 A

20-MaS43 Soil Ni-63 Bq/kg 438 980 686 - 1274 N(4)

Tc-99 Bq/kg 1.11 (1)

A 20-MaW43 Water Ni-63 Bq/L 0.175 (1)

A Tc-99 Bq/L 8.8 9.4 6.6 - 12.2 A

20-RdV43 Vegetation Cs-134 Bq/sample 3.635 4.94 3.46 - 6.42 W

Cs-137 Bq/sample 0.0341 (1)

A Co-57 Bq/sample 5.855 6.67 4.67 - 8.67 W

Co-60 Bq/sample 3.122 4.13 2.89 - 5.37 W

Mn-54 Bq/sample 4.524 5.84 4.09 - 7.59 A

Sr-90 Bq/sample 1.01 1.39 0.97 - 1.81 W

Zn-65 Bq/sample 4.706 6.38 4.47 - 8.29 W

(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 20-13 (4) See NCR 20-20 DOE's Mixed Analyte Performance Evaluation Program (MAPEP)

Teledyne Brown Engineering Environmental Services (Page 1 of 1)

Table D-2 D-3

Month/Year Identification Number Matrix Nuclide Units TBE Value Known Value (a)

Acceptance Limits Evaluation (b)

March 2020 MRAD-32 Water Am-241 pCi/L 52.5 45.3 31.1 - 57.9 A

Fe-55 pCi/L 155 152 89.3 - 221 A

Pu-238 pCi/L 34.0 36.4 21.9 - 47.2 A

Pu-239 pCi/L 30.9 33.6 20.8 - 41.4 A

April 2020 RAD-121 Water Ba-133 pCi/L 41.8 41.8 34.0- 46.7 A

Cs-134 pCi/L 42.9 46.3 37.1 - 50.9 A

Cs-137 pCi/L 226 234 211 - 259 A

Co-60 pCi/L 52.4 50.3 45.3 - 57.9 A

Zn-65 pCi/L 83.3 86.8 78.1 - 104 A

GR-A pCi/L 20.1 23.6 11.9 - 31.6 A

GR-B pCi/L 45.6 60.5 41.7 - 67.2 A

U-Nat pCi/L 18.45 18.6 14.9 - 20.9 A

H-3 pCi/L 14200 14100 12300 - 15500 A

Sr-89 pCi/L 58.0 60.1 48.3 - 67.9 A

Sr-90 pCi/L 34.1 44.7 33.0 - 51.2 A

I-131 pCi/L 27.4 28.9 24.1 - 33.8 A

September 2020 MRAD-33 Soil Sr-90 pCi/Kg 4360 4980 1550 - 7760 A

AP Fe-55 pCi/Filter 189 407 149 - 649 A

U-234 pCi/Filter 17.9 18.3 13.6 - 21.4 A

U-238 pCi/Filter 19.1 18.1 13.7 - 21.6 A

Water Am-241 pCi/L 160 176 121 - 225 A

Fe-55 pCi/L 299 298 175 - 433 A

Pu-238 pCi/L 200 191 115 - 247 A

Pu-239 pCi/L 105 100 61.9 - 123 A

October 2020 RAD-123 Water Ba-133 pCi/L 37.1 37.0 29.8 - 41.6 A

Cs-134 pCi/L 50.6 52.7 42.5 - 58.0 A

Cs-137 pCi/L 131 131 118 - 146 A

Co-60 pCi/L 62.9 60.5 54.4 - 69.1 A

Zn-65 pCi/L 167 162 146 - 191 A

GR-A pCi/L 40.0 26.2 13.3 - 34.7 N(1)

GR-B pCi/L 47.5 69.1 48.0 - 76.0 N(1)

U-Nat pCi/L 17.2 20.3 16.3 - 22.7 A

H-3 pCi/L 23800 23200 20,300 - 25,500 A

Sr-89 pCi/L 41.1 43.3 33.4 - 50.5 A

Sr-90 pCi/L 28.5 30.2 22.0 - 35.0 A

I-131 pCi/L 22.9 28.2 23.5 - 33.1 N(2)

November 2020 QR111920K Water GR-A pCi/L 50.7 52.4 27.3 - 65.6 A

GR-B pCi/L 24.9 24.3 15.0 - 32.3 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 20-18 (2) See NCR 20-17 ERA Environmental Radioactivity Cross Check Program Teledyne Brown Engineering Environmental Services (Page 1 of 1)

Table D-3 D-4

APPENDIX E ERRATA DATA

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There was no errata data for 2020.

E-1

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APPENDIX F ANNUAL RADIOLOGICAL GROUNDWATER PROTECTION PROGRAM REPORT (ARGPPR)

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Docket No:

50-010 50-237 50-249 DRESDEN NUCLEAR POWER STATION UNITS 1, 2 and 3 Annual Radiological Groundwater Protection Program Report 1 January through 31 December 2020 Prepared By Teledyne Brown Engineering Environmental Services Dresden Nuclear Power Station Morris, IL 60450 May 2020

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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 C. Background Analysis......................................................................................... 7

1. Background Concentrations of Tritium...................................................... 7 IV. Results and Discussion................................................................................................. 9 A. Groundwater Results........................................................................................... 9 B. Surface Water Results..................................................................................... 10 C. Precipitation Water Results............................................................................... 10 D. Drinking Water Well Survey............................................................................... 10 E. Summary of Results - Inter-laboratory Comparison Program........................... 10 F. Leaks, Spills, and Releases............................................................................... 10 G. Trends............................................................................................................... 10 H. Investigations..................................................................................................... 11 I. Actions Taken..................................................................................................... 11

- ii -

Appendices ARGPPR Appendix A Location Designation Tables Table A-1 Radiological Groundwater Protection Program - Sampling Locations, Distance and Direction, Dresden Nuclear Power Station, 2020 Figures Security-Related Information: Maps of the Dresden Nuclear Power Station have been withheld from public disclosure under 10CFR2.390 and N.J.S.A. 47:1A-1.1 ARGPPR Appendix B Data Tables Tables Table B-I.1 Concentrations of Tritium, Strontium, Gross Alpha and Gross Beta in Groundwater Samples Collected in the Vicinity of Dresden Nuclear Power Station, 2020 Table B-I.2 Concentrations of Gamma Emitters in Groundwater Samples Collected in the Vicinity of Dresden Nuclear Power Station, 2020 Table B-I.3 Concentrations of Hard-To-Detects in Groundwater Samples Collected in the Vicinity of Dresden Nuclear Power Station, 2020 Table B-II.1 Concentrations of Tritium in Precipitation Water Samples Collected in the Vicinity of Dresden Nuclear Power Station, 2020

I.

Summary and Conclusions Dresden Station is situated on approximately 600 acres of land that borders the Illinois River to the north and the Kankakee River to the east. This land is referred to as the owner-controlled area. The Dresden power plant itself takes up a small parcel of the owner-controlled area and is surrounded by a security fence. The security fence defines what is known as the Protected Area (PA).

The Dresden power plant has experienced leaks from underground lines and spills from systems containing radioactive water over its 50-year history. These incidents have created a number of areas of localized contamination within the PA. The liquid scintillation analyses of groundwater in many of these areas show measurable concentrations of tritium (H-3).

Dresden participated in a fleetwide hydrogeologic investigation in during the summer of 2006 in an effort to characterize groundwater movement at each site.

This investigation also compiled a list of the historic spills and leaks as well as a detailed analysis on groundwater hydrology for Dresden Nuclear Generation Station. Combining the tritium concentration in a locally contaminated area with the speed and direction of groundwater in the vicinity can produce a contaminated groundwater plume projection. If the plume of contaminated groundwater passes through the path of a groundwater monitoring well, it can be anticipated that the tritium concentration in this well will increase to some maximum concentration, then decrease over time.

The fleetwide 5-Year Hydrogeologic Investigation Report (HIR) was generated in 2020 by AECOM. It shows that groundwater movement on the Dresden site is very slow. In addition, there is a confining rock layer, the Maquoketa Shale layer, about 55 feet below the surface that impedes groundwater movement below this depth.

Dresden has a domestic water system that is supplied by two deep wells (1500 feet deep) that were installed about 50 years ago south of the PA. Samples taken from domestic water supply have never shown any detectable tritium concentration.

Tritium has a half-life of 12.3 years. This means that 40 years from now 90% of the tritium on site today will have decayed away to more stable elements. Given the limited volume of contaminated groundwater on site, radioactive decay, slow groundwater movement, and dilution effects, the conclusion of the HIR is that the operation of Dresden Nuclear Power Station has no adverse radiological impact on the environment. As a result there is little potential for contaminated groundwater on site to affect off-site drinking water.

II.

Introduction Radiological Groundwater Monitoring Program (RGPP):

Dresden has a Radiological Groundwater Monitoring Program (RGPP) that provides long-term monitoring intended to verify the fleet-wide hydrogeologic study conclusions. Dresden uses developed groundwater wells and surface water sample points in the RGPP.

The Dresden RGPP was established in 2006 and there have been no significant changes to this program. This program does not impact the operation of the plant and is independent of the REMP.

Developed groundwater wells are wells that were installed specifically for monitoring groundwater. These wells are equipped with screens and are properly sealed near the surface to avoid surface water intrusion. The wells were designed in accordance with appropriate codes and developed in accordance with appropriate standards and procedures. Dresden has groundwater monitoring wells identified as shallow (depths from 15 to 35 feet), Intermediate (depths from 35 to 55 feet) and deep (depths beyond 100 feet). All wells installed to a depth greater than 100 feet (deep wells) were found to be dry and removed from the RGPP. Surface water sample points are identified sample locations in the stations canals and cooling pond.

There are 96 sampling points in the RGPP:

Dresden has 47 developed groundwater monitoring wells within the Protected Area (PA). Some of these wells form a ring just inside the security fence and the remaining wells were installed near underground plant system piping that contains radioactive water.

Dresden has 30 developed groundwater monitoring wells outside the PA the majority of which form a ring just within the perimeter of the property.

Dresden has 12 surface water monitoring locations on the owner-controlled area sampled as part of the Dresden RGPP. Three of these locations are monitored for level only and have no analyses in the accompanying tables.

Dresden has 4 precipitation water monitoring locations sampled as part of the Dresden RGPP. An additional 8 locations were studied in 2011 through 2012, but only 4 locations are currently permanently a part of the RGPP program.

Dresden has 1 sentinel well and 2 CST leak detection valves. These 3 sampling points are not constructed to code or developed to a standard. These sampling points are idle and only used for qualitative troubleshooting.

The Dresden site-specific RGPP procedure identifies the historic events that would affect the individual RGPP sample results. This procedure identifies threshold values for each sample point, which if exceeded, could be an indication of a new spill from an above ground system or a new leak in an underground pipe containing tritiated water.

The RGPP sample points are currently sampled on a frequency determined by the well detection category in accordance with site document EN-DR-408-4160, Dresden RGPP Reference Material. During 2020, there were 212 analyses that were performed on 118 samples from 58 sampling points.

Sentinel Wells, sometimes referred to as baby wells are wells that were installed to monitor local shallow groundwater; typically in associated with a historic underground pipe leak. These wells are not constructed to code or developed to a standard. Most sentinel wells are from 6 to 12 feet deep and consist of 2 PVC pipe without screens. These wells are categorized as idle wells and are used only for troubleshooting purposes.

Dresden has two basic storm water runoff sewer systems within the P.A: one storm-system routes to the east, then north and discharges into the Unit 1 intake canal, the second storm-system routes to the west, then north, through a large Oil/Water Separator and discharges to the hot canal. Both the Unit 1 intake canal and the hot canal eventually route to the cooling pond. The Dresden Station RGPP has twelve RGPP surface water sampling points to monitor these systems.

A.

Objectives of the RGPP The Objective of the RGPP is to provide long-term monitoring intended to verify the fleet-wide hydrogeologic study conclusions. The objective of the site-specific RGPP is to provide indication of short-term changes to groundwater tritium concentrations within the PA.

If isotopic results of groundwater samples exceed the thresholds specified in this procedure it could be an indication of a new spill from an above ground system or a new leak in an underground pipe containing tritiated water.

Specific Objectives include:

1. Perform routine water sampling and radiological analysis of water from selected locations.

2. Report new leaks, spills, or other detections with potential radiological significance to stakeholders in a timely manner.

3. Regularly assess analytical results to identify adverse trends.

4. Take necessary corrective actions to protect groundwater resources.

B.

Implementation of the Objectives

1. Dresden Nuclear Power Station will continue to perform routine sampling and radiological analysis of water from selected locations.

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

3. Dresden Nuclear Power Station staff and consulting hydrogeologist assess analytical results on an ongoing basis to identify adverse trends.

4. If an adverse trend in groundwater monitoring analytical results is identified, further investigation will be undertaken. If the investigation identifies a leak or unidentified spill, corrective actions will be implemented.

C.

Program Description Dresden has a Radiological Groundwater Monitoring Program (RGPP) that provides long-term monitoring intended to verify the fleet-wide hydrogeologic study conclusions. Dresden uses 89 developed groundwater wells and surface water sample points in the RGPP.

Sample locations can be found in Table A-1, Appendix A. Water samples are collected in accordance with the schedule delineated in the Dresden site-specific RGPP procedures. Analytical laboratories are subject to internal quality assurance programs, industry crosscheck programs, as well as nuclear industry audits. Station personnel review and evaluate the analytical results.

D.

Characteristics of Tritium (H-3)

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

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

Tritium is produced naturally in the upper atmosphere when cosmic rays strike air molecules. Tritium is also produced during nuclear weapons explosions, as a by-product in reactors producing electricity and in special production reactors, where the isotopes lithium-7 and/or boron-10 are activated to produce tritium. Like normal water, tritiated water is

colorless and odorless. Tritiated water behaves chemically and physically like non-tritiated water in the subsurface and therefore tritiated water will travel at the same velocity as the average groundwater velocity.

Tritium has a half-life of approximately 12.3 years. It decays spontaneously to helium-3 (3He). This radioactive decay releases a beta particle (low-energy electron). The radioactive decay of tritium is the source of the health risk from exposure to tritium. Tritium 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 Teledyne Brown Engineering (TBE) to analyze the environmental samples for radioactivity for the Dresden Nuclear Power Station RGPP in 2020.

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

1. Concentrations of gamma emitters in groundwater.

2. Concentrations of strontium in groundwater.

3. Concentrations of tritium in groundwater and precipitation water.

4. Concentrations of gross alpha in groundwater.

5. Concentrations of Am-241 in groundwater.

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

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

8. Concentrations of U-233/234, U-235 and U-238 in groundwater.

9. Concentrations of Fe-55 in groundwater.

10. Concentrations of Ni-63 in groundwater.

B.

Data Interpretation The radiological data collected prior to Dresden Nuclear Power Station becoming operational were used as a baseline with which these operational data were compared. For the purpose of this report, Dresden Nuclear Power Station was considered operational at initial criticality.

Several factors were important in the interpretation of the data:

1. Lower Limit of Detection and Minimum Detectable Concentration The Lower Limit of Detection (LLD) is the 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 Generation, LLC

reports the uncertainty of a measurement created by statistical process (counting error) as well as all sources of error (Total Propagated Uncertainty or TPU). Each result has two values calculated. Exelon Generation, LLC reports the TPU by following the result with plus or minus +/- the estimated sample standard deviation as TPU that is obtained by propagating all sources of analytical uncertainty in measurements.

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

When required, gamma spectroscopy includes the following 14 nuclides: Be-7, K-40, Mn-54, Co-58, Fe-59, Co-60, Zn-65, Nb-95, Zr-95, I-131, Cs-134, Cs-137, Ba-140 and La-140.

C.

Background Analysis A pre-operational radiological environmental monitoring program (pre-operational REMP) was conducted to establish background radioactivity levels prior to operation of the Station. The environmental media sampled and analyzed during the pre-operational REMP were atmospheric radiation, fall-out, domestic water, surface water, marine life, and food stuffs. The results of the monitoring were detailed in the report entitled, Environmental Radiological Monitoring for Dresden Nuclear Power Nuclear Power Station, Commonwealth Edison Company, Annual Report 1986, May 1987.

1. Background Concentrations of Tritium The purpose of the following discussion is to summarize background measurements of tritium in various media performed by others.

Additional detail may be found by consulting references (CRA 2006).

a. Tritium Production Tritium is created in the environment from naturally-occurring processes both cosmic and subterranean, as well as from anthropogenic (i.e., man-made) sources. In the upper atmosphere, Cosmogenic tritium is produced from the bombardment of stable nuclides and combines with oxygen to form tritiated water, which will then enter the hydrologic cycle.

Below ground, lithogenic tritium is produced by the bombardment of natural lithium present in crystalline rocks by neutrons produced by the radioactive decay of naturally abundant uranium and thorium. Lithogenic production of tritium is usually negligible compared to other sources due to the limited abundance of lithium in rock. The lithogenic tritium is introduced directly to groundwater.

A major anthropogenic source of tritium and 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.

b. Precipitation Data Precipitation samples are routinely collected at stations around the world for the analysis of tritium and other radionuclides. Two publicly available databases that provide tritium concentrations in precipitation are Global Network of Isotopes in Precipitation (GNIP) and USEPAs RadNet database. GNIP provides tritium precipitation concentration data for samples collected worldwide from 1960 to 2006. RadNet provides tritium precipitation concentration data for samples collected at stations throughout the U.S. from 1960 up to and including 2006. Based on GNIP data for sample stations located in the U.S. Midwest, tritium concentrations peaked around 1963. This peak, which approached 10,000 pCi/L for some stations, coincided with the atmospheric testing of thermonuclear weapons.

Tritium concentrations in surface water showed a sharp decline up until 1975 followed by a gradual decline since that time.

Tritium concentrations in Midwest precipitation have typically been below 100 pCi/L since around 1980.

Tritium concentrations in wells may still be above the 200-pCi/L detection limit from the external causes described above. Water from previous years and decades is naturally captured in groundwater, so some well water sources today are affected by the surface water from the 1960s that was elevated in tritium.

c.

Surface Water Data Tritium concentrations are routinely measured in large surface water bodies, including Lake Michigan and the Mississippi River.

Illinois surface water data were typically less than 100 pCi/L.

The radio-analytical laboratory counts tritium results to an Exelon Generation, LLC specified LLD of 200 pCi/L. Typically, the lowest positive measurement will be reported within a range of 40 - 240 pCi/L or 140 +/- 100 pCi/L. These sample results cannot be distinguished as different from background at this concentration.

IV.

Results and Discussion Dresden Station initiated a Radiological Groundwater Protection Program (RGPP) in 2006.

A.

Groundwater Results Samples were collected from on-site wells throughout the year in accordance with Dresdens RGPP. Analytical results and anomalies are discussed below:

Tritium Following historic ground tritium-contamination events at Dresden Station routine sampling and analyses continue, both inside and outside the protected area, in accordance with site procedure EN-DR-408-4160, Dresden Station RGPP Reference Material.

Low level tritium was detected from January through December 2020 in several sampling and testing locations (Table B-I.1, Appendix B);

however, overall tritium concentrations have been trending down.

The vast majority of these locations showed a range of tritium contamination from LLD to values less than 20,000 pCi/L.

It is important to note that in prior years, wells that exceeded the United States Environmental Agency (USEPA) drinking water standard (and the Nuclear Regulatory Commission Reporting Limit) of 20,000 pCi/L were due to the 2014 2/3B CST Leak. The exceedances are located within Station property, and do not serve as a drinking water source.

Strontium Samples were collected and analyzed for Sr-89 and Sr-90 activity (Table B-I.1, Appendix B). Sr-89 was not detected in any of the samples. Sr-90 was detected in 2 samples at locations MW-DN-105S and DSP-108. The concentrations ranged from 1.6 to 2.4 pCi/L.

Gross Alpha (dissolved and suspended)

Gross Alpha monitoring was not required in 2020.

Gamma Emitters Gamma nuclide monitoring was not required in 2020 Hard-To-Detects Hard-To-Detect analyses were performed on 12 groundwater locations.

The analyses included Fe-55, Ni-63, Am-241, Cm-242, Cm-243/244, Pu-238, Pu-239/240, U-233/234, U-235 and U-238. U-233/234 and U-238

were detected in one sample at MW-DN-101-I at a concentration of 0.30 pCi/L and 0.18 pCi/L respectively. Ni-63 was detected in samples taken at MW-DN-101-I and MW-DN-119I. The concentrations ranged from 9.6 to 26.6 pCi/L. All other hard-to-detect nuclides were not detected at concentrations greater than their respective MDCs.

(Table B-I.3, Appendix B).

B.

Surface Water Results No surface water samples were collected in 2020.

C.

Precipitation Water Results Precipitation Water Samples were collected from 4 precipitation water locations throughout the year in accordance with the station radiological groundwater protection program. Analytical results and anomalies are discussed below.

Tritium Samples from 4 locations were analyzed for tritium activity. Tritium was detected in one sample at a concentration of 207 pCi/L.

(Table B-II.1, Appendix B)

D.

Drinking Water Well Survey No drinking water well surveys were conducted in 2020.

E.

Summary of Results - Inter-Laboratory Comparison Program Inter-Laboratory Comparison Program results for TBE are presented in the AREOR.

F.

Leaks, Spills, and Releases No leaks, spills, and releases occurred in 2020.

G.

Trends Overall, tritium concentrations are decreasing across the Station. The Station continued to implement the tritium monitoring plan with monthly/quarterly sampling of a subset of shallow and intermediate aquifer wells, sewage treatment plant water, and storm sewer water.

An elevated concentration persists in the area of the Condensate Storage Tanks (Event 20 in EN-DR-408-4160, Revision 6, Attachment 3). As of December 2015, active remediation was implemented. Two remediation wells were installed in August 2015; however, the West remediation well is capable of enough recharge for active remediation.

H.

Investigations No investigations performed in 2020.

I.

Actions Taken

1. Compensatory Actions None.

2. Actions to Recover/Reverse Plumes In August 2015, two remediation wells were installed by the CSTs.

The intent is to pump tritiated water out of the ground. The water is processed through the liquid radwaste system. Active remediation was initiated in December 2015. Remediation continued through 2017.

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APPENDIX A LOCATION DESIGNATION

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TABLE A-1:

Radiological Groundwater Protection Program - Sampling Locations, Dresden Nuclear Power Station, 2020 Site Site Type Location CBG DSP-106 Monitoring Well 65 feet east of east wall of EM Shop DSP-107 Monitoring Well 9 feet east of the east Unit 1 Fuel Pool wall DSP-108 Monitoring Well 40 ft east of the Unit 1 Sphere DSP-122 Monitoring Well 50 feet north of the Radwaste Tank Farm DSP-123 Monitoring Well Northeast corner of the Unit 1 Off-gas Building DSP-124 Monitoring Well 9 feet south of Floor Drain Collector Tank DSP-125 Monitoring Well Northeast corner of the Unit 2/3A CST DSP-126 Monitoring Well 21 feet northwest of the northwest bend in road behind Training Building DSP-147 Monitoring Well 325 feet west of Telemetry Bridge DSP-148 Monitoring Well 130 feet southeast of the Flow Regulating Station building DSP-149 Monitoring Well 35 feet south by southwest of the 138 KV yard fence DSP-150 Monitoring Well 85 feet east of the northeast corner of the Unit 1 Spent Fuel Pool pad DSP-154 Monitoring Well 33 feet west of the track; 165 feet east of the Security Checkpoint DSP-159-M Monitoring Well 250 feet west of the Thorsen house; 450 ft south of the plant access gate FW-1 Precipitation 40 feet southwest of Unit 2/3 Off-gas Filter Building access door; north end of guardrail FW-10 Precipitation At the fence at the northwest corner of the SBO Building FW-11 Precipitation 30 feet east of the east wall of the EM shop; at the stanchion for RGPP well DSP-105 FW-12 Precipitation 60 feet southeast of the southwest corner of the Admin Building; on the security fence DSP-159-S Monitoring Well 251 feet west of the Thorsen house; 450 ft south of the plant access gate MD-11 Sample Location Piping located between Condensate Storage Tanks.

MW-DN-101-I Monitoring Well 60 feet north of the Unit 1 Diesel Fuel Storage MW-DN-101-S Monitoring Well 60 feet north of the Unit 1 Diesel Fuel Storage MW-DN-102-S Monitoring Well 13 feet south of the southeast corner of the MUDS Building MW-DN-103-I Monitoring Well 280 feet west of the northwest corner of N-GET Building MW-DN-103-S Monitoring Well 281 feet west of the northwest corner of N-GET Building MW-DN-104-S Monitoring Well 50 feet north of Radwaste Tank Farm MW-DN-105-S Monitoring Well 65 feet north of the northeast corner of the Storeroom MW-DN-107-S Monitoring Well 15 feet west by southwest of the Unit 1 CST MW-DN-109-I Monitoring Well 8 feet north of Chemistry Building MW-DN-109-S Monitoring Well 8 feet north of Chemistry Building MW-DN-110-S Monitoring Well 25 feet west of the Waste Water Treatment (WWT) Building MW-DN-111-S Monitoring Well 9 feet east of the Floor Drain Collector Tank MW-DN-112-I Monitoring Well 100 feet south of the Chemistry Building MW-DN-112-S Monitoring Well 100 feet south of the Chemistry Building MW-DN-113-S Monitoring Well 91 feet west of the southwest corner of the Administration Building MW-DN-114-I Monitoring Well 50 feet east of the Unit 1 Clean Demineralized Water Tank MW-DN-114-S Monitoring Well 8 feet southwest of the Radiation protection Dept west access doors MW-DN-115-I Monitoring Well 11 feet south of Instrument Maintenance Shop MW-DN-115-S Monitoring Well 12 feet south of Instrument Maintenance Shop MW-DN-116-I Monitoring Well 75 feet south of the Calgon Building roll-up door MW-DN-116-S Monitoring Well 75 feet south of the Calgon Building roll-up door MW-DN-117-I Monitoring Well 35 feet east by northeast of the Unit 1 Stack MW-DN-118-S Monitoring Well Southeast corner of the Unit 1 Fuel Pool MW-DN-119-I Monitoring Well 20 feet east by northeast of the Unit 1 Sewage Ejector Building MW-DN-119-S Monitoring Well 21 feet east by northeast of the Unit 1 Sewage Ejector Building MW-DN-122-I Monitoring Well 150 feet north of Collins Road; northeast of the G.E. Fuel Storage Facility MW-DN-122-S Monitoring Well 150 feet north of Collins Road; northeast of the G.E. Fuel Storage Facility MW-DN-124-I Monitoring Well 10 feet south of the liquid nitrogen inerting tanks MW-DN-124-S Monitoring Well 10 feet south of the liquid nitrogen inerting tanks MW-DN-125-S Monitoring Well 40 feet east of 2/3 B CST MW-DN-126-S Monitoring Well 15 feet south of fence around Unit 2/3 A CST and B CST (outside of fence)

MW-DN-127-S Monitoring Well 20 feet south of Unit 3 HRSS MW-DN-134-S Monitoring Well 20-ft North of Mausoleum Building MW-DN-135-S Monitoring Well 20-ft East of Mausoleum Building MW-DN-136-S Monitoring Well 14.5-ft South of Mausoleum Building MW-DN-137-S Monitoring Well 20-ft West of Mausoleum Building MW-DN-140-S Monitoring Well East of MW-DN-104S at SW corner outside of 2/3 crib house MW-DN-141-S Monitoring Well North of A Waste Tank next to 2/3 main chimney MW-DN-142-S Monitoring Well MW-DN-143-S Monitoring Well MW-DN-144-S Monitoring Well A-1

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APPENDIX B DATA TABLES

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TABLE B-I.1 COLLECTION SITE DATE H-3 Sr-89 CBG 11/11/20 243 +/- 114 DSP-106 03/19/20 1220 +/- 199 DSP-106 07/20/20 1000 +/- 161 DSP-106 11/10/20 1300 +/- 214

< 6.4

< 0.9 DSP-107 03/19/20 1500 +/- 222 DSP-107 07/21/20 1550 +/- 223

< 6.2

< 0.8 DSP-107 11/10/20 1550 +/- 250 DSP-108 03/19/20

< 179 DSP-108 07/21/20 320 +/- 139

< 7.2 2.4 +/- 0.6 DSP-108 11/10/20 413 +/- 137 DSP-122 03/24/20 373 +/- 126 DSP-122 07/22/20 559 +/- 148 DSP-122 11/10/20 657 +/- 142

< 7.9

< 0.9 DSP-123 03/20/20

< 178 DSP-123 07/21/20 378 +/- 138

< 6.6

< 0.7 DSP-123 11/10/20 251 +/- 114 DSP-124 03/24/20 182 +/- 118 DSP-124 07/20/20 518 +/- 148 DSP-124 11/11/20 388 +/- 123

< 4.8

< 0.9 DSP-125 03/25/20

< 181 DSP-125 07/23/20 212 +/- 133 DSP-125 11/11/20

< 180

< 7.3

< 0.9 DSP-126 11/09/20

< 167 DSP-147 11/09/20

< 169 DSP-148 11/09/20 261 +/- 119 DSP-149 11/09/20 615 +/- 137 DSP-150 11/10/20

< 189 DSP-154 11/09/20

< 184 DSP-159-M 11/09/20 274 +/- 119 DSP-159-S 11/09/20

< 174 MD-11 03/25/20 17800 +/- 1840 MD-11 07/23/20 13600 +/- 1410 MD-11 11/11/20 12600 +/- 1320

< 8.3

< 1.0 MW-DN-101-I 03/20/20

< 180

< 5.1

< 0.6 MW-DN-101-I 07/21/20 559 +/- 149

< 6.8

< 1.0 MW-DN-101-I 11/10/20 342 +/- 121 MW-DN-101-S 03/26/20

< 178 MW-DN-101-S 07/21/20

< 192

< 5.8

< 0.8 MW-DN-101-S 11/10/20

< 168 MW-DN-102-S 11/11/20

< 168 MW-DN-103-I 11/09/20 273 +/- 126 MW-DN-103-S 11/09/20

< 186 MW-DN-104-S 03/24/20

< 187 MW-DN-104-S 07/22/20

< 196 MW-DN-104-S 11/10/20 302 +/- 128

< 7.3

< 0.9 MW-DN-105-S 03/19/20

< 185 Sr-90 CONCENTRATIONS OF TRITIUM AND STRONTIUM IN GROUNDWATER SAMPLES COLLECTED IN THE VICINITY OF DRESDEN NUCLEAR POWER STATION, 2020 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA B-1

TABLE B-I.1 COLLECTION SITE DATE H-3 Sr-89 Sr-90 CONCENTRATIONS OF TRITIUM AND STRONTIUM IN GROUNDWATER SAMPLES COLLECTED IN THE VICINITY OF DRESDEN NUCLEAR POWER STATION, 2020 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA MW-DN-105-S 07/20/20 368 +/- 140

< 5.5 1.6 +/- 0.6 MW-DN-105-S 11/10/20 242 +/- 119 MW-DN-107-S 03/25/20 1810 +/- 254 MW-DN-107-S 07/20/20 280 +/- 131 MW-DN-107-S 11/11/20 336 +/- 126

< 7.7

< 0.9 MW-DN-109-I 03/24/20 208 +/- 120 MW-DN-109-I 07/22/20 481 +/- 143 MW-DN-109-I 11/10/20 377 +/- 129

< 8.1

< 0.9 MW-DN-109-S 03/24/20

< 184 MW-DN-109-S 07/22/20

< 194 MW-DN-109-S 11/10/20

< 196

< 8.3

< 0.9 MW-DN-110-S 11/10/20

< 192 MW-DN-111-S 03/24/20 3470 +/- 410 MW-DN-111-S 07/20/20 2250 +/- 287 MW-DN-111-S 11/11/20 1470 +/- 224

< 9.1

< 0.9 MW-DN-112-I 11/11/20

< 193 MW-DN-112-S 11/11/20

< 192 MW-DN-113-S 11/11/20

< 198 MW-DN-114-I 11/11/20 2330 +/- 304 MW-DN-114-S 03/25/20

< 177 MW-DN-114-S 07/22/20

< 195 MW-DN-114-S 11/11/20

< 197 MW-DN-114-S 12/08/20

< 169

< 9.2

< 0.9 MW-DN-115-I 11/11/20 259 +/- 128 MW-DN-115-S 03/19/20

< 184 MW-DN-115-S 07/20/20

< 193 MW-DN-115-S 11/11/20

< 192

< 8.9

< 0.9 MW-DN-116-I 11/10/20

< 194 MW-DN-116-S 03/20/20

< 183 MW-DN-116-S 07/22/20

< 193

< 4.2

< 0.7 MW-DN-116-S 11/10/20

< 191 MW-DN-117-I 03/20/20

< 188 MW-DN-118-S 03/19/20

< 184 MW-DN-118-S 07/21/20 218 +/- 128 MW-DN-118-S 11/10/20

< 185

< 6.0

< 0.9 MW-DN-119-I 03/20/20

< 184

< 5.6

< 0.8 MW-DN-119-I 07/21/20 314 +/- 134

< 6.8

< 0.8 MW-DN-119-I 11/10/20

< 195 MW-DN-119-S 03/20/20

< 185 MW-DN-119-S 07/21/20

< 192 MW-DN-119-S 11/10/20

< 195

< 9.3

< 0.9 MW-DN-122-I 11/09/20

< 191 MW-DN-122-S 11/09/20

< 191 MW-DN-124-I 03/24/20 16700 +/- 1720 MW-DN-124-I 07/20/20 16100 +/- 1660 MW-DN-124-I 11/11/20 15000 +/- 1560

< 8.2

< 0.8 B-2

TABLE B-I.1 COLLECTION SITE DATE H-3 Sr-89 Sr-90 CONCENTRATIONS OF TRITIUM AND STRONTIUM IN GROUNDWATER SAMPLES COLLECTED IN THE VICINITY OF DRESDEN NUCLEAR POWER STATION, 2020 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA MW-DN-124-S 03/24/20

< 182 MW-DN-124-S 07/20/20 366 +/- 131 MW-DN-124-S 11/11/20 1120 +/- 190

< 6.1

< 1.0 MW-DN-125-S 11/11/20

< 179 MW-DN-126-S 03/25/20

< 185 MW-DN-126-S 07/20/20

< 184 MW-DN-126-S 11/11/20

< 180

< 7.9

< 0.9 MW-DN-127-S 11/11/20

< 179 MW-DN-134-S 11/12/20

< 175 MW-DN-135-S 11/09/20

< 173 MW-DN-136-S 03/20/20

< 181 MW-DN-136-S 07/21/20

< 183 MW-DN-136-S 11/09/20

< 177

< 5.6

< 0.9 MW-DN-137-S 11/09/20

< 178 MW-DN-140-S 03/24/20

< 182 MW-DN-140-S 11/10/20

< 174

< 8.9

< 0.9 MW-DN-141-S 03/24/20 1300 +/- 200 MW-DN-141-S 07/22/20 1460 +/- 208 MW-DN-141-S 11/11/20 335 +/- 121

< 6.6

< 0.9 MW-DN-142-S 11/09/20

< 177 MW-DN-143-S 11/09/20

< 173 MW-DN-144-S 11/12/20

< 174 B-3

TABLE B-I.2 COLLECTION SITE DATE Zr-95 None Analyzed in 2020 Nb-95 Mn-54 Ba-140 La-140 CONCENTRATIONS OF GAMMA EMITTERS IN GROUNDWATER SAMPLES COLLECTED IN THE VICINITY OF DRESDEN NUCLEAR POWER STATION, 2020 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA I-131 Be-7 K-40 Co-58 Cs-134 Cs-137 Fe-59 Co-60 Zn-65 B-4

TABLE B-I.3 COLLECTION SITE DATE Cm-242 Pu-238 Pu-239/240 DSP-107 07/21/20

< 82

< 5.0 DSP-108 07/21/20

< 104

< 5.0 DSP-123 07/21/20

< 164

< 4.1 MD-11 11/11/20

< 0.05

< 0.02

< 0.10

< 0.07

< 0.15

< 0.04

< 0.16

< 76

< 4.8 MW-DN-101-I 03/20/20

< 0.11

< 0.02

< 0.14

< 0.07

< 0.04 0.30 +/- 0.14

< 0.05 0.18 +/- 0.10

< 110 9.6 +/- 3.0 MW-DN-101-I 07/21/20

< 90

< 4.7 MW-DN-101-I 11/10/20

< 4.8 MW-DN-101-S 07/21/20

< 58

< 4.3 MW-DN-105-S 07/20/20

< 60

< 4.6 MW-DN-116-S 07/22/20

< 65

< 4.4 MW-DN-119-I 03/20/20

< 0.12

< 0.02

< 0.15

< 0.05

< 0.18

< 0.12

< 0.14

< 0.13

< 96 12.4 +/- 3.3 MW-DN-119-I 07/21/20

< 0.06

< 0.03

< 0.06

< 0.16

< 0.19

< 0.09

< 0.11

< 127 17.8 +/- 2.9 MW-DN-119-I 11/10/20 26.6 +/- 3.1 MW-DN-119-S 11/10/20

< 66

< 4.2 MW-DN-124-I 11/11/20

< 0.08

< 0.04

< 0.14

< 0.10

< 0.12

< 0.15

< 0.08

< 52

< 4.5 MW-DN-124-S 11/11/20

< 0.05

< 0.02

< 0.08

< 0.11

< 0.12

< 110

< 3.2 U-238 U-233/234 Ni-63 CONCENTRATIONS OF HARD TO DETECTS IN GROUNDWATER SAMPLES COLLECTED IN THE VICINITY OF DRESDEN NUCLEAR POWER STATION, 2020 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA Cm-243/244 U-235 Fe-55 Am-241 B-5

TABLE B-II.1 COLLECTION SITE DATE FW-1 11/12/20 207 +/- 116 FW-10 11/12/20

< 170 FW-11 11/12/20

< 175 FW-12 11/12/20

< 276 CONCENTRATIONS OF TRITIUM IN PRECIPITATION WATER SAMPLES COLLECTED IN THE VICINITY OF DRESDEN NUCLEAR POWER STATION, 2020 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA H-3 B-6

SVPLTR 21-0028, 2020 Annual Radiological Environmental Operating Report

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SVPLTR 21-0028, 2020 Annual Radiological Environmental Operating Report

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