ML23137A163

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Annual Radiological Environmental Operating Report
ML23137A163
Person / Time
Site: Dresden  Constellation icon.png
Issue date: 05/31/2023
From:
Constellation Energy Generation, Teledyne Brown Engineering Environmental Services
To:
Office of Nuclear Material Safety and Safeguards, Office of Nuclear Reactor Regulation
References
SVPL TR# 23-0018
Download: ML23137A163 (1)
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Text

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 2022 Prepared By Teledyne Brown Engineering Environmental Services Dresden Nuclear Power Station Morris, IL.60450 May 2023

Intentionally left blank Table Of Contents I. Summary and Conclusions .............................................................................................. 1 II. Introduction .....................................................................................................:................. 2 A. Objectives of the REMP ........................................................................................ 2 B. Implementation of the Objectives ........................................................................ 2 Ill. Program Description ........................ .-.............................................................................. 3 A. Sample Collection ................................................................................................ 3 B. Sample Analysis ............................. :.................................................................... 4 C. Data Interpretation ............................................................................................... 4

.D. Program Exceptions ............................................................................................. 5 E. Program Changes ............................................................................................... 6 IV. Results and Discussion ................................................................................................. 7 A. Aquatic Environment ........................................................................................... 7

1. Surface Water ........................................................................................... 7
2. Ground Water ........................................................................., ................. 7
3. Fish .............................................. ,............................................................ 8
4. Sediment ................................................................................................... 8 B. Atmospheric Environment ................................................................................... 8
1. Airborne .................................................................................................... 8
a. Air Particulates .............................................................'.................. 8
b. Airborne Iodine ................................................................................ 9
2. Terrestrial ................................................................................................... 9
a. Milk ..................................................................................:.............. 9
b. Food Products ................................................................................. 9 C. Ambient Gamma Radiation ................................................................................ 1O D. Land Use Survey ............................................................................................... 10 E. Errata Data ........................................................................................................ 11 F. Summary of Results - Inter-laboratory Comparison Program ........................... 11

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, 2022 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, 2022 Table B-2 Radiological Environmental Monitoring Program - Summary of Sample Collection and Analytical Methods, Dresden Nuclear Power Station, 2022 Figures Figure B-1 Dresden Station Inner Ring OSLO Locations, Fish, Water, and Sediment Locations, 2022 Figure B-2 Dresden Station Fixed Air Sampling and OSLO Sites, Outer Ring OSLO Locations,2022 Appendix C Data Tables and Figures Tables Table C-1.1 Concentrations of Gross Beta in Surface Water Samples Collected in the Vicinity of Dresden Nuclear Power Station, 2022 Table C-1.2 Concentrations of Tritium in Surface Water Samples Collected in the Vicinity of Dresden Nuclear Power Station, 2022 Table C-1.3 Concentrations of Gamma Emitters in Surface Water Samples Collected in the Vicinity of Dresden Nuclear Power Station, 2022 Table C-11.1 Concentrations of Tritium in Ground Water Samples Collected in the Vicinity of Dresden Nuclear Power Station, 2022 ii

Table C-I1.2 Concentrations of Gamma Emitters in Ground Water Samples Collected in the Vicinity of Dresden Nuclear Power Station; 2022 Table C-111.1 Concentrations of Gamma Emitters in Fish Samples Colle~ted in the Vicinity of Dresden Nuclear Power Station, 2022

  • Table C-IV.1 Concentrations of Gamma Emitters in Sediment Samples Collected in the Vicinity of Dresden Nuclear Power Station, 2022 Table C-V.1 Concentrations of Gross Beta in Air Particulate Samples Collected in the Vicinity of Dresden Nuclear Power Station, 2022 Table C-V.2 Monthly and Yearly Mean Values of Gross Beta Concentrat.ions in Air Particulate Samples Collected in the Vicinity of Dresden Nuclear Power Station, 2022 Table C-V.3 Concentrations of Gamma Emitters in Air Particulate Sampl,es Collected in the Vicinity of Dresden Nuclear Power Station, 2022 Table C-Vl.1 Concentrations of 1-131 in Air Iodine Samples Collected in the Vicinity of Dresden Nuclear Power Station, 2022 Table C-Vll.1 Concentrations of Gamma Emitters in Vegetation Samples Collected in the Vicinity of Dresden Nuclear Power Station, 2022 Table C-Vlll.1 Quarterly DLR Results for Dresden Nuclear Power Station, 2022 Figures Figure C-1 Surface Water - Gross Beta - Station D-52 (C) Collected iri the Vicinity of DNPS, 2000 - 2022 Figure C-2 Surface Water - Gross Beta - Station D-57 (C) Collected in the Vicinity of DNPS, 2006 - 2022 Figure C-3 Surface Water.:. Gross Beta - Station D-21 Collected in the Vicinity of DNPS, 2000 - 2022 Figure C-4 Surface Water - Tritium - Station D-52 (C) Collected in the Vicinity of DNPS, 2000 - 2022 Figure C-5 Surface Water - Tritium - Station D-57 (C) Collected in the Vicinity of DNPS, 2006 - 2022 Figure C-6 Surface Water - Tritium - Station D-21 Collected in the Vicinity of DNPS, 2007 - 2022 Figure C-7 Ground Water - Tritium - Station D-35 Collected in the Vicinity of DNPS, 2000 - 2022 Figure C-8 Ground Water - Tritium - Station D-39 Collected in the Vicinity of DNPS, 2022 iii

Figure C-9 Air Particulate - Gross Beta - Stations D-01 and D-02 Collected in the Vicinity of DNPS, 2000 - 2022 Figure C-10 Air Particulate - Gross Beta - Stations D-03 and D-04 Collected in the Vicinity of DNPS, 2000 - 2022 Figure C-11 Air Particulate - Gross Beta - Stations D-07 and D-12 (C) Collected in the Vicinity of DNPS, 2000 - 2022 Figure C-12 Air Particulate - Gross Beta - Stations D-45 and D-53 Collected in the Vicinity of DNPS, 2000 - 2022 Figure C-13 Air Particulate - Gross Beta - Stations D-08 and D-10 Collected in the Vicinity of DNPS, 2005 - 2022 Figure C-14 Air Particulate - Gross Beta - Station D-14 Collected in the Vicinity of DNPS, 2005 - 2022 Figure C-15 Air Particulate - Gross Beta - Stations D-55 and D-56 Collected in the Vicinity of DNPS, 2006 - 2022 Figure C-16 Air Particulate - Gross Beta - Station D-58 Collected in the Vicinity of DNPS, 2011 - 2022 Appendix D Inter-Laboratory Comparison Program Tables Table D-1 Analytics Environmental Radioactivity Cross Check Program Teledyne Brown Engineering, 2022 Table D-2 DOE's Mixed Analyte Performance Evaluation Program (MAPEP)

Teledyne Brown Engineering, 2022 Table D-3 ERA Environmental Radioactivity Cross Check Program Teledyne Brown Engineering, 2022 Appendix E Errata Data Appendix F Annual Radiological Groundwater Protection Program Report (ARGPPR) iv

I. Summary and Conclusions There were no regulatory effluent limit exceedances in 2022 and the resultant calculated dose to a member of the public for 2022 due to the uranium fuel cycle was 7.47E+00 mRem, which is 29.88% of the regulatory limit of 25 mRem/year.

The annual organ dose from all effluent sources is 3.1 BE-02 mRem/yr which is 4.23E-02% of the 75 mRem/yr (Thyroid) limit. Additionally, the Annual Radiological Environmental Operating Report (AREOR) supported the effluent dose calculation and indicates that Units 1, 2, and 3 of the Dresden Nuclear Power Station did not result in any adverse environmental impact.

  • 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 (1-131) analyses were performed on weekly air samples. All results were less than the minimum detectable activity for 1-131.

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 (OSLO). 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 Constellation Energy covers the period 1 January 2022 through 31 December 2022. During that time period, 1,830 analyses were performed on 1,721 samples. In assessing all the data gathered for this report it was concluded that the operation of DNPS had no ad\/erse radiological impact on the environment.

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II. Introduction The Dresden Nuclear Power Station (DNPS), consisting of one retired reactor and two operating boiling water reactors owned and operated by Constellation Energy Corporation, 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 2022 through 31 December 2022.

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

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.

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Ill. Program Description A. Sample Collection Samples for the DNPS REMP were collected for Constellation 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 2022. 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 (Fl) 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-35 and D-39). 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 b~ss, channel catfish, golden redhorse, common carp and smallmouth buffalo 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/Al).

Airborne iodine and particulate samples were collected at fourt'een 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 iodilile 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 When a milk sample is available within 5 km (3.1 miles) from the Site, samples are collected biweekly from the indicator location and a control location (10 to 30 km from the Site) from May to October typically and monthly November through April. No milk samples were collected in 2022.

Broad leaf vegetation samples were collected in lieu of milk.

Food products (FL) were collected June through October at five locations (D-25, D-39, D-42, D-43 and D-44). The control location was D-25. Various types of samples were collected and placed in new unused plastic bags and sent to the laboratory for analysis.

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

An inner ring consisting of 16 locations (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 OSLO 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, 0-55, D-56 and D-58).

The balance of one location (D-12) represents the control area OSLO 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 2022. 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, fish, sediment and vegetation.
3. Concentrations of tritium in ground and surface water.
4. Concentrations of 1-131 in air.
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:

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 4

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, 1-131, 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 2022 the DNPS REMP had a sample recovery rate greater than 98%

(1,721 of 1,746 samples collected). Sample anomalies and missed samples are listed in the following tables:

Table D-1 LISTING OF SAMPLE ANOMALIES Sample Location Collection Reason Type Code Date 01/08/22 SW D-52 River frozen

- 02/04/22 D-22 GW 01/15/22 House sold and water turned off D-24 SW D-57 01/28/22 River frozen AP/Al D-04 12/09/22 No power at the station SW D-52 12/23/22 River frozen SW D-57 12/30/22 River frozen 5

Table D-2 LISTING OF ODCM-REQUIRED MISSED SAMPLES Sample Location Collection Reason Type Code Date 01/01/22 No sample obtained due to power failure at the AP/Al D-12

- 03/04/22 station 06/03/22 No sample obtained due to power failure at the AP/Al D-12

- 06/17/22 station 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 2022.

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IV. Results and Discussion A. Aquatic Environment

1. Surface Water Samples were composited or taken weekly and compositeq for analysis at three locations (D-21, D-52 and D-57). Of these locations only D-21, located downstream, could be affected by Dresden's effluent releases.

The following analyses were performed:

Gross Beta Monthly composites from all locations were analyzed for concentrations of gross beta (Table C-1.1, Appendix C). Gross Beta was.detected in 29 of 33 samples. The values ranged from 3.0 to 14.4 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-1.2, Appendix C). Four samples at indicator station D-21 were positive for tritium with a concentration range of 216 - 1,420 pCi/L. Four samples at control station D-57 were positive for tritium with concentrations ranging from 254 to 2,540 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-1.3, Appendix C)

2. Ground Water Quarterly grab samples were collected at locations D-35 and D-39. These locations could be affected by Dresden's effluent releases and by sources upstream on the Kankakee River. The following analyses were pel;formed:
  • Tritium All were analyzed for tritium activity (Table C-11.1, Appendix C). Tritium was not detected in any sample. Results were consistent with those in previous years. (Figures C-7 & C-8, Appendix C) 7

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

(Table C-11.2, Appendix C)

3. Fish Fish samples comprised of largemouth bass, channel catfish, golden redhorse, common carp and smallmouth buffalo were collected at two locations (D-28 and D-46) semiannually. Location D-28 col!:lld be affected by Dresden's 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-111.1, 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 Dresden's 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) 8

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 6.39E-3 to 4.68.E-2 pCi/m 3 with a mean of 2.01 E-2 pCi/m 3

  • The results from the Near-Field locations ranged from 6.16E-3 to 4.95E-2 pCi/m 3 with a mean of 2.90E-2 pCi/m 3 . The results from the Far-Field locations ranged from 6.19E-3 to 4.72E-2 pCi/m 3 with a mean of 2.06E-2 pCi/m 3 .

The results from the Control location ranged from 6.62E-3 to 4.43E-2 pCi/m 3 with a mean of 1.99E-2 pCi/m 3 . Comparison of the 2022 air particulate data with previous year's data indicate no effects from the operation of DNPS. In addition, a comparison of the weekly mean values for 2022 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 leslthan 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 1-131. All results were less than the MDC for 1-131.

(Table C-Vl.1, Appendix C)

2. Terrestrial
a. Milk No Milk (M) samples were analyzed in 2022.
b. Food Products Food product samples were collected at five locations (D-25, D-39, D-42 D-43 and D-44) when available. The Control location is D-25 and the other 4 locations could be affected by Dresden's 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-Vlll.1, Appendix C) 9

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

Most OSLO measurements were below 22 mrem/quarter, with a range of 8.3 to 21.1 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 September 10, 2022, around the Dresden Nuclear Power Station (DNPS) was performed by EIML for Constellation Energy 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:

Distance in Miles from the DNPS Reactor Buildings Residence Livestock Milk Farm Sector Miles Miles Miles A N 1.5 1.4 B NNE 0.8 C NE 0.8 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 5.5 N w 3.5 0.5 p WNW 3.2 0.5 Q NW 2.2 0.5 R NNW 1.9 1.0 E. Errata Data There was no errata data in 2022.

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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 TB E's re~ult and Analytics' known value. Since flag values are not assigned by Analytics, TBE evaluates the reported ratios based on internal QC requirements based on the DOE MAPEP criteria.

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

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

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

  • Acceptable (flag = "A") - result within +/- 20% of the reference value
  • Acceptable with Warning (flag = "W') - result falls in :the +/- 20% to

+/- 30% of the reference value

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

For the TBE laboratory, 142 out of 150 analyses performed met the specified acceptance criteria. Eight analyses did not meet the specified acceptance criteria and were addressed through the TBE Corrective Action Program. A summary is found below:

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NOTE: Two analyses (soil for Tc-99 and U-238) that did not meet acceptance criteria was performed for TBE information and is not on the list of required /GP analyses.

1. The Analytics March 2022 AP Ce-141 result was evaluated as Not Acceptable. The reported value for Ce-141 was 60.9 pCi and the known result was 42.0 pCi/L (1 .45 ratio of reported result.vs. known; TBE's internal acceptance range is 0.70 - 1.30). This sample was used as the workgroup duplicate with a result of 45.7 (109% of known) and was also counted on a different detector with a result of 50.9 (121% of known). This was TBE's first failure for AP Ce-141.

(NCR 22-04)

2. The MAPEP February 2022 Urine U-234 & U-238 results were evaluated as Not Acceptable. TBE's reported values of 0.142 and 0.0254 were above the known upper ranges of 0.0096 and 0.0134 respectively for U-234 and U-238. These spiked values were below TBE's typical MDC for urine client samples. The samples were re-prepped using a larger sample aliquot and counted for 60 hours6.944444e-4 days <br />0.0167 hours <br />9.920635e-5 weeks <br />2.283e-5 months <br /> as opposed to 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br />. The recount results were 0.00732 for U-234 and 0.0119 for U-238 (both within acceptable range). MAPEP': urine samples will be flagged to use a larger sample aliquot and counting time than typical client samples. MAPEP did not include any urine cross-check samples in August. (NCR 22-05)
3. The ERA MRAD September 2022 AP Pu-238 was evaluated as Not Acceptable. The reported value was 38.8 pCi and the kn9wn result was 29.9 (acceptance range 22.6 - 36.7). The AP filter was cut in half prior to digestion (shared with Fe-55) but should have be~n complete digested together and aliquotted afterwards like typical cli~nt samples.

This is the first failure for AP Pu-238. (NCR 22-19)

4. The ERA October 2022 water Uranium result was evaluated as Not Acceptable. The reported value was 10.54 pCi/L and the known was 8.53 (acceptance range 6.60 - 9.88) or 124% of the known (acceptable for TBE QC). The 2-sigma error was 3.2, placing the reported result well within the acceptable range. This sample was used as the workgroup duplicate with a result of 8~2 +/- 2.9 pCi/L (also within the acceptable range). All other QA was reviewed with no anomalies. (NCR 22-20)
5. The Analytics AP Co-60 result was evaluated as Not Acceptable. The reported value was 207 pCi and the known was 147 (141% of the known). TBE's internal QC acceptance is 70 - 130%. All QA was reviewed with no anomalies. This sample was used as the workgroup duplicate and counted on a different detector with a result of 167 pCi 12

(114% of the known). This is the first failure for AP Co average result ratio compared to the known is 109%. (NCR 22-21)

6. The MAPEP August 2022 water Tc-99 result was evaluated as Not Acceptable. The reported value was 1.86 +/- 0.414 Bq/Lfor this "false positive" test. The evaluation of the submitted result to th'e 3 times the uncertainty indicated a slight positive. This sample was used as the workgroup duplicate with a result of 0.88 +/- 0.374 Bq/L.
  • All QC was reviewed, and no anomalies found. This is the first unacceptable since the resumption of reporting water Tc-99 for the 3rd quarter of 2020. TBE to known ratios have ranged from 94-109% during this time. (NCR 22-22)

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

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Intentionally left blank APPENDIX A RADIOLOGICAL ENVIRONMENTAL MONITORING REPORT

SUMMARY

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

SUMMARY

FOR DRESDEN NUCLEAR POWER STATION, 2022 NAME OF FACILITY: DRESDEN DOCKET NUMBER: 50-010, 50-237 & 50-249 LOCATION OF FACILITY: MORRIS IL REPORTING PERIOD: 2022 INDICATOR CONTROL MEDIUM OR REQUIRED LOCATIONS LOCATION LOCATION WITH HIGHEST ANNUAL MEAN (M) NUMBER OF PATHWAY SAMPLED TYPES OF NUMBER OF LOWER LIMIT MEAN(M) MEAN (M) MEAN(M) STATION# NONROUTINE (UNITOF ANALYSIS ANALYSIS OF DETECTION (F) (F) (F) NAME REPORTED MEASUREMENT) PERFORMED PERFORMED (LLD) RANGE RANGE RANGE DISTANCE AND DIRECTION MEASUREMENTS SURFACE WATER GR-B 33 4 8.6 8.7 11 D-52 CONTROL 0 (PCI/LITER) (11112) (18121) (10111) DESPLAINES RIVER ATWILL ROAD (CONTROL) 5.2-13.1 3.0-14.4 5.4-14.4 1.1 MILES ESE OF SITE H-3 12 2000 585 1138 1138 D-57 CONTROL 0 (414) (418) (4/4) KANKAKEE RIVER AT WILL ROAD (CONTROL) 216-1420 254-2540 254-2540 2.0 MILES SE OF SITE GAMMA 33 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 l>I NB-95 15 <LLD <LLD 0

..lo.

ZR-95 30 <LLD <LLD 0 1-131 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 GROUNDWATER H-3 8 2000 NA NA NA 0 (PCIILITER)

GAMMA 8 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 1-131 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 (M) The Mean Values are calculated using the positive values. (F) Fraction of detectable measurement are indicated in parentheses

TABLE A-1 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANNUAL

SUMMARY

FOR DRESDEN NUCLEAR POWER STATION, 2022 NAME OF FACILITY: DRESDEN DOCKET NUMBER: 50-010, 50-237 & 50-249 LOCATION OF FACILITY: MORRIS IL REPORTING PERIOD: 2022 INDICATOR CONTROL MEDIUM OR REQUIRED LOCATIONS LOCATION LOCATION WITH HIGHEST ANNUAL MEAN (M) NUMBER OF PATHWAY SAMPLED TYPES OF NUMBER OF LOWER LIMIT MEAN(M) MEAN (M) MEAN (M) STATION# NONROUTINE (UNITOF ANALYSIS ANALYSIS OF DETECTION (F) (F) (F) NAME REPORTED MEASUREMENT) PERFORMED PERFORMED (LLD) RANGE RANGE RANGE DISTANCE AND DIRECTION MEASUREMENTS FISH GAMMA 8 (PCIIKG 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

> (PCl!KG DRY) MN-54 NA <LLD NA 0 I

N 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-137 180 129 NA 129 D-27 INDICATOR 0 (112) (112) ILLINOIS RIVER AT DRESDEN LOCK AND DAM - DOWNSTREAM 0.8 MILES NW OF SITE BA-140 NA <LLD NA 0 LA-140 NA <LLD NA 0 AIR PARTICULATE GR-B 717 10 21 20 22 D-10 INDICATOR 0 (E-3 PCIICU.M) (6741676) (41141) (52/52) GOOSE LAKE VILLAGE 6-50 7-44 8-47 3.5 MILES SSW 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

TABLE A-1 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANNUAL

SUMMARY

FOR DRESDEN NUCLEAR POWER STATION, 2022 NAME OF FACILITY: DRESDEN DOCKET NUMBER: 50-010, 50-237 & 50-249 LOCATION OF FACILITY: MORRIS IL REPORTING PERIOD: 2022 INDICATOR CONTROL MEDIUM OR REQUIRED LOCATIONS LOCATION LOCATION WITH HIGHEST ANNUAL MEAN (M) NUMBER OF PATHWAY SAMPLED TYPES OF NUMBER OF LOWER LIMIT MEAN(M) MEAN(M) MEAN(M) STATION# NONROUTINE (UN/TOF ANALYSIS ANALYSIS OF DETECTION (F) (F) (F) NAME REPORTED MEASUREMENT) PERFORMED PERFORMED (LLD) RANGE RANGE RANGE DISTANCE AND DIRECTION MEASUREMENTS AIRIODINE GAMMA 721 (E-3 PCIICU.M) 1-131 70 <LLD <LLD 0 VEGETATION GAMMA 52 (PCVKGWET) MN-54 NA <LLD <LLD 0 C0-58 NA <LLD <LLD 0 FE-59 NA <LLD <LLD 0 C0-60 NA <LLD <LLD 0 ZN-65 NA <LLD <LLD 0 NB-95 NA <LLD <LLD a ZR-95 NA <LLD <LLD 0

/-131 60 <LLD <LLD 0 CS-134 60 <LLD <LLD 0

)>

I CS-137 80 <LLD <LLD a

(,I) BA-140 NA <LLD <LLD 0 LA-140 NA <LLD <LLD 0 DIRECT RADIATION OSLD-QUARTERLY 184 NA 14.2 13.0 17.9 D-110 INDICATOR 0 (MILL/-ROENTGENIQTR.) (180/180) (4/4) (4/4) 8.3 - 21.2 11.3-13.2 17.1-21.2 0.9 MILES SSW

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

Intentionally left blank r

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, 2022 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-35 Dresden Lock & Dam Morris, IL (indicator) 0.8 miles NW D-39 3985 Will Rd., Coal City, IL (indicator) 3.2 miles SSE C. 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 milesW 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 D. Fish D-28 Dresden Pool of Illinois River, Downstream (indicator) 0.9 miles NNW D-46 DesPlaines River, Upstream (control) 1.2 miles ESE E. Sediment D-27 Illinois River at Dresden Lock and Dam, Downstream (indicator) 0.8 miles NW F. Broadleaf Vegetation D-25 Vince Biros Farm, Reed Road (control) 11.3 miles SW D-39 3985 Will Rd., Coal City, IL (indicator) 3.2 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, 2022 Location Location Description Distance & Direction From Site G. Environmental Dosimetry - OSLO Inner Ring 0-101 1.0 miles N 0-102 1.3 miles NNE 0-103 1.2 miles NE 0-104 1.7 miles ENE 0-105 1.5 miles E 0-106 1.1 miles ESE 0-107 1.4 miles SE 0-108 1.9 miles SSE 0-109 0.8 miles S 0-110 0.9 miles SSW 0-111 0.6 miles SW 0-112 0.7 miles WSW 0-113 0.9 milesW 0-114 0.9 miles WNW 0-115 0.8 miles NW 0-116 1.0 miles NNW Outer Ring 0-201 4.8 miles N 0-202 5.1 miles NNE 0-203 4.7 miles NE 0-204 5.0 miles ENE 0-205 4.0 miles E 0-206 3.5 miles ESE 0-207 4.2 miles SE 0-208 4.9 miles SSE 0-209 4.1 miles S 0-210 4.9 miles SSW 0-211 4.8 miles SW 0-212 6.0 miles WSW 0-213 4.5 miles W 0-214 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 0-02 Onsite 2 0.3 miles NNE 0-03 Onsite 3 0.4 miles S D-04 Collins Road, on Station property 0.8 milesW 0-07 Clay Products, Dresden Road 2.6 miles S 0-08 Juqtown 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 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, 2022 Sample Analysis Sampling Method Collection Procedure Number Sample Size Analytical Procedure Number Medium EIML-SPM-1, Environmental Incorporated Midwest Laboratory Sampling Procedures Monthly composite TBE, TBE-2007 Gamma-Emitting Manual sample or monthly Radioisotope Analysis Surface Water Gamma Spectroscopy 2 gallon composite from weekly TSE, TBE-2023 Compositing of samples grab samples EIML-COMP-01 procedure for compositing water and milk samples EIML-SPM-1, Environmental Incorporated Midwest Laboratory Sampling Procedures Monthly composite TSE, TBE-2008 Gross Alpha and/or Manual sample or monthly Gross Beta Activity in Various Matrices Surface Water Gross Beta 2 gallon composite from weekly TSE, TBE-2023 Compositing of samples grab samples EIML-COMP-01 procedure for compositing water and milk samples OJ I EIML-SPM-1, Environmental Incorporated ti) Midwest Laboratory Sampling Procedures TSE, TBE-2011 Tritium Analysis in Quarterly composite of Manual Drinking Water by Liquid Scintillation Surface Water Tritium monthly composite 500ml TSE, TBE-2023 Compositing of samples samples EIML-COMP-01 procedure for compositing water and milk samples EIML-SPM-1, Environmental Incorporated TSE, TBE-2007 Gamma-Emitting Ground Water Gamma Spectroscopy Quarterly grab samples Midwest Laboratory Sampling Procedures 2 gallon Radioisotope Analysis Manual EIML-SPM-1, Environmental Incorporated TSE, TBE-2011 Tritium Analysis in Ground Water Tritium Quarterly grab samples Midwest Laboratory Sampling Procedures 500 ml Drinking Water by Liquid Scintillation Manual Samples collected twice EIML-SPM-1, Environmental Incorporated annually via TSE, TBE-2007 Gamma-Emitting Fish Gamma Spectroscopy Midwest Laboratory Sampling Procedures 1000 grams (wet) electroshocking or other Radioisotope Analysis Manual techniques EIML-SPM-1, Environmental Incorporated TBE, TBE-2007 Gamma-Emitting Semi-annual grab Sediment Gamma Spectroscopy Midwest Laboratory Sampling Procedures 500 grams (dry) Radioisotope Analysis samples Manual

TABLE B-2: Radiological Environmental Monitoring Program - Summary of Sample Collection and Analytical Methods, Dresden Nuclear Power Station, 2022 Sample Analysis Sampling Method Collection Procedure Number Sample Size Analytical Procedure Number Medium Annual grab samples if dredging occurred EIML-SPM-1, Environmental Incorporated TSE, TBE-2007 Gamma-Emitting Dredging Spoils Gamma Spectroscopy within 1 mile of Dresden Midwest Laboratory Sampling Procedures 500 grams (dry)

Radioisotope Analysis Station during the year. Manual One-week of continuous EIML-SPM-1, Environmental Incorporated 1 filter (approximately TBE, TBE-2008 Gross Alpha and/or Air Particulates Gross Beta air sampling through Midwest Laboratory Sampling Procedures 280 cubic meters Gross Beta Activity in Various Matrices glass fiber filter paper Manual weekly)

TBE, TBE-2023 Compositing of samples Quarterly composite of Env. Inc., AP-03 Procedure for compositing air TBE, TBE-2007 Gamma-Emitting Air Particulates Gamma Spectroscopy 13 filters each station particulate filters for gamma spectroscopic Radioisotope Analysis analysis One- or two-week EIML-SPM-1, Environmental Incorporated 1 filter (approximately composite of continuous TBE, TBE-2007 Gamma-Emitting Air Iodine Gamma Spectroscopy Midwest Laboratory Sampling Procedures 280 cubic meters air sampling through Radioisotope Analysis Manual weekly) charcoal filter Broadleaf EIML-SPM-1, Environmental Incorporated Grab samples July TBE, TBE-2007 Gamma-Emitting Vegetation Gamma Spectroscopy Midwest Laboratory Sampling Procedures 1000 grams through October; Radioisotope Analysis (in lieu of milk) Manual Quarterly OSLDs Optically Stimulated EIML-SPM-1, Environmental Incorporated comprised of two 2 dosimeters at each OSLD Luminescence Midwest Laboratory Sampling Procedures Landauer Incorporated Al2OJ:C Landauer location Dosimetry Manual Incorporated elements.

0 D-116 0 D-101 D-45 0 D-01 0 D-114 9 D-02 9 D-113 Q D-105 0 DRESDEN SITE 9 D-03 0 D-110 q D-109 D-108 9 D-53 Figure B-1 Dresden Station Inner Ring OSLD Locations, Fish , Water, and Sediment Location , 2022 B-5

9 D-12 0 0-215 0 D-203 0

c,,1nn;i1 ion 0-14

'q . ,

0-214

~

0 D-t 05 0 0-205 D-213 D-03 0 0-58 8Edford v.~ D-56 9 D-206 0-53 0 0-212 9 0-08 9 D-07 0 D-10 0 D-211 IS 9 D-209 0 0-208 0-210 47 Figure B-2 Dresden Station Fixed Air Sampling and OSLO Sites, Outer Ring OSLO Locations, 2022 B-6

APPENDIX C DATA TABLES AND FIGURES

Intentionally left blank Table C-I.1 CONCENTRATIONS OF GROSS BETA IN SURFACE WATER SAMPLES COLLECTED IN THE VICINITY OF DRESDEN NUCLEAR POWER STATION, 2022 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION PERIOD D-21 D-52 D-.57 12/31/21

  • 01/28/22 5.2 +/- 2.2 (1) (1) 01/28/22 02/25/22 9.9 +/- 2.8 13.9 :I: 3.6 6.6 +/- 2.1 02/25/22
  • 03/31/22 5.4 +/- 2.3 11.3 +/- 3.5 11.6 +/- 2.9 03/31/22
  • 04/29/22 8.3 +/- 3.1 8.3 +/- 3.2 < 3.4 04/29/22
  • 05/27/22 8.9 +/- 2.6 8.5 +/- 2.7 3.0 +/- 2.0 05/27/22 - 06/24/22 8.4 +/- 2.9 10.5 +/- 3.1 5.1 +/- 2.5 06/24/22 - 07/29/22 5.4 +/- 2.0 5.4 +/- 2.1 3.6 .. +/- 1.9 07/29/22
  • 08/26/22 < 3.0 < 3.1 <.3.0 08/26/22 10/01/22 11.6 +/- 2.8 14.4 +/- 3.0 6.1 +/- 2.3 10/01 /22
  • 10/28/22 8.8 +/- 3.0 13.1 +/- 3.4 4.5 +/- 2.7 10/28/22 - 11 /25/22 13.1 +/- 2.9 13.4 +/- 2.9 5.5  ::1: 2.3 11 /25/22
  • 12/30/22.. 10.0 +/- 3.1 11.6 +/- 3.3 (1)

MEAN+/- 2 STD DEV 8.6 +/- 5.1 11.0 +/- 5.8 5.7 +/- 5.0 Table C-1.2 CONCENTRATIONS OF TRITIUM IN SURFACE WATER SAMPLES COLLECTED IN THE VICINITY OF DRESDEN NUCLEAR POWER STATION, 2022 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION PERIOD D-21 D-52 D-57 12/31/21 - 03/31/22 442 +/- 123 < 180 948 +/- 171 04/01/22 - 06/24/22 263 +/- 124 < 183 808 *+/- 156 07/01/22 09/30/22 216 +/- 111 < 187 254 +/- 123 10/07/22

  • 12/16/22 1420 +/- 212 < 182 2540 +/- 317 MEAN+/- 2 STD DEV 585 +/- 1130 1138 + 1964 THE MEAN AND 2 STANDARD DEVIATION ARE CALCULATED USING THE POSITIVE VALUES C-1

Table C-1.3 CONCENTRATIONS OF GAMMA EMITTERS IN SURFACE WATER SAMPLES COLLECTED IN THE VICINITY OF DRESDEN NUCLEAR POWER STATION, 2022 RESULTS IN UNITS OF PCI/LITER + 2 SIGMA COLLECTION SITE PERIOD Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 1-131 Cs-134 Cs-137 Ba-140 La-140 D-21 12/31/21 - 01/28/22 <4 < 4 < 10 < 6 < 7 <5 < 9 <8 <4 < 5 < 22 < 7 01/28/22 - 02/25/22 <8 < 7 < 13 < 8 < 17 <7 < 11 < 11 < 8 < 9 < 28 < 11 02/25/22 - 03/31 /22 <5 <4 < 12 < 7 < 11 <7 < 12 <8 < 6 < 8 < 25 < 14 03/31 /22 - 04/29/22 <6 < 5 < 13 < 6 < 13 <7 < 11 <9 < 6 < 6 < 25 < 9 04/29/22 - 05/27/22 <4 < 5 < 12 < 6 < 11 <5 < 9 <9 <4 < 7 < 23 < 10 05/27122 - 06/24/22 < 6 < 5 < 11 < 7 < 10 <5 < 10 <9 <7 < 7 < 26 < 6 06/24/22 - 07/29/22 <8 < 8 < 17 < 7 < 18 <8 < 14 < 11 < 10 < 9 < 38 < 10 07/29/22 - 08/26/22 <4 < 4 < 9 < 5 < 10 <5 < 10 <8 <5 < 6 < 22 < 7 08/26/22 - 10/01/22 <7 < 6 < 13 < 6 < 14 <7 < 12 <8 <5 < 6 < 29 < 10 10/01 /22 - 10/28/22 <6 < 7 < 16 < 8 < 16 <7 < 13 < 10 <9 < 7 < 39 < 12 10/28/22 - 11 /25/22 <7 < 6 < 13 < 8 < 15 <7 < 11 < 11 < 6 < 6 < 31 < 9 11 /25/22 - 12/30/22 <6 < 7 < 13 < 6 < 14 < 6 < 11 < 12 <7 < 6 < 30 < 8 MEAN D-52 12/31/21 - 01/28/22 (1) 0I 02/11 /22 - 02/25/22 <8 < 11 < 21 < 8 < 16 <8 < 12 < 12 < 9 < 9 < 33 "< 8 N 03/04/22 - 03/25/22 <5 < 8 < 11 < 6 < 12 <7 < 12 < 8 <6 < 7 < 22 < 8 04/01/22 - 04/29/22 <6 < 9 < 11 < 7 < 10 <7 < 11 < 12 < 8 < 7 < 36 < 9 05/06/22 - 05/27122 <5 < 6 < 15 < 7 < 13 < 6 < 12 < 9 < 7 "<5 < 27 < 10 06/03/22 - 06/24/22 <7 < 6 < 14 < 8 < 15 <6 < 12 < 9 < 6 < 8 < 30 < 9 07/01/22 - 07/29/22 <7 < 6 < 11 < 9 < 16 < 6 *< 11 < 11 < 6 < 6 < 30 < 10 08/05/22 - 08/26/22 <4 <4 < 8 < 6 < 8 <5 < 8 < 6 <5 < 5 < 18 < 6 09/02/22 - 10/01/22 <7 < 5 < 13 < 7 < 15 <7 < 12 < 9 < 8 < 8 < 28 < 8 10/07/22 - 10/28/22 < 8 < 7 < 14 < 9 < 12 <8 < 10 < 10 <7 < 8 < 30 < 12 11 /04/22 - 11 /25/22 <6 < 5 < 15 < 5 < 11 < 6 < 11 < 10 < 5 < 8 < 27 < 9 12/02/22 - 12/30/22 <6 < 7 < 11 < 7 < 12 <7 < 8 < 10 <7 < 7 < 26 < 7 MEAN D-57 01/01/22 - 01/31/22 (1) 02/25/22 - 02/25/22 <5 < 7 < 14 < 6 < 13 < 8 < 13 < 10 < 9 < 8 < 34 < 11 03/31 /22 - 03/31 /22 <6 < 8 < 16 < 9 < 17 < 8 < 13 < 8 < 8 < 7 < 34 < 14 04/29/22_ - 04/29/22 <6 < 7 < 1_3 < 8 < 14 < 6 < 9 < 11 < 7 < 6 < 29 < 7 05/27/22 - 05/27/22 < 6 < 5 < 10 < 6 < 9 < 5 < 8 < 8 < 5 < 5 < 24 < 9 06/24/22 - 06/24/22 < 6 < 6 < 9 < 6 < 11 < 7 < 10 < 8 < 6 < 5 < 24 < 7 07/29/22 - 07/29/22 < 6 < 7 < 13 < 9 < 13 < 7 < 12 < 8 < 7 < 6 < 23 < 9 08/26/22 - 08/26/22 < 3 < 4 < 9 < 5 < 11 < 4 < 9 < 6 < 5 < 4 < 18 < 5 10/01 /22 - 10/01 /22 < 7 < 7 < 12 < 5 < 16 < 8 < 12 < 9 < 9 < 8 < 27 < 9 10/28/22 - 10/28/22 < 6 < 8 < 15 < 7 < 14 < 9 < 11 < 10 < 5 < 9 < 30 < 12 11 /25/22 - 11 /25/22 < 6 < 7 < 13 < 7 < 12 < 7 < 9 < 11 < 8 < 6 < 29 < 10 12/23/22 - 12/23/22 (1)

MEAN

Table C-I1.1 CONCENTRATIONS OF TRITIUM IN GROUND WATER SAMPLES COLLECTED IN THE VICINITY OF DRESDEN NUCLEAR POWER STATION, 2022 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION PERIOD D-35 D-39 01/15/22 - 01/15/22 < 192 03/25/22 - 03/25/22 < 172 04/08/22 - 04/08/22 < 191 < 189 07/08/22 - 07/08/22 < 181 < 180 10/14/22 - 10/14/22 < 196 < 198 MEAN

- Sample was unable to be obtained due to the water at the residence being shut off at the time of collection.

C-3

Tables C-11.2 CONCENTRATIONS OF GAMMA EMITTERS IN GROUND WATER SAMPLES COLLECTED IN THE VICINITY OF DRESDEN NUCLEAR POWER STATION, 2022 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION SITE PERIOD Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 1-131 Cs-134 Cs-137 Ba-140 La-140 D-35 01/15/22 - 01/15/22 < 6 < 6 < 11 < 8 < 10 < 8 < 11 < 8 < 7 < 6 < 26 < 7 04/08/22 - 04/08/22 < 6 < 6 < 15 < 8 < 16 < 5 < 10 < 8 < 7 < 7 < 26 < 11 07/08/22 - 07/08/22 < 5 < 5 < 10 < 6 < 9 < 6 < 11 < 8 < 7 < 5 < 24 < 7 10/14/22 - 10/14/22 < 8 < 5 < 12 < 9 < 17 < 7 < 15 < 9 < 9 < 7 < 33 < 12 MEAN D-39 03/25/22 - 03/25/22 < 6 < 6 < 14 < 5 < 13 < 7 < 12 < 9 < 8 < 7 < 23 < 9 04/08/22 - 04/08/22 < 5 < 7 < 13 < 8 < 14 < 7 < 10 < 8 < 8 < 7 < 32 < 8 07/08/22 - 07 /08/22 < 6 < 5 < 10 < 4 < 14 < 5 < 11 < 8 < 7 < 6 < 23 < 9 10/14/22 - 10/14/22 < 7 < 8 < 17 < 7 < 16 < 6 < 14 < 11 < 9 < 7 < 31 < 5 MEAN C)

I

~

Table C-111.1 CONCENTRATIONS OF GAMMA EMITTERS IN FISH SAMPLES COLLECTED IN THE VICINITY OF DRESDEN NUCLEAR POWER STATION, 2022 RESULTS IN UNITS OF PCI/KG WET+ 2 SIGMA COLLECTION SITE PERIOD Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 Cs-134 Cs-137 Ba-140 La-140 D-28 PREDATOR Largemouth Bass 05/03/22 < 78 < 75 < 182 < 85 < 175 < 79 < 148 < 93 < 81 < 398 < 180 Largemouth Bass 10/13/22 < 62 < 56 < 104 < 51 < 91 < 51 < 116 < 66 < 60 < 327 < 103 MEAN D-28 BOTTOM FEEDER Channel Catfish 05/03/22 < 46 < 32 < 91 < 40 < 105 < 38 < 72 < 49 < 39 < 195 < 78 Golden Redhorse 10/13/22 < 34 < 36 < 69 < 37 < 83 < 35 < 69 < 37 < 35 < 193 < 71 MEAN 0I 01 D-46 PREDATOR Largemouth Bass 10/13/22 < 67 < 50 < 91 < 71 < 107 < 65 < 112 < 49 < 53 < 341 < 67 MEAN D-46 BOTTOM FEEDER Smallmouth Buffalo 05/03/22 < 38 < 45 < 57 < 39 < 108 < 67 < 105 < 65 < 48 < 252 < 114 Common Carp 05/03/22 < 63 < 78 < 142 < 76 < 154 < 76 < 101 < 78 < 62 < 408 < 109 Golden Redhorse 10/13122 < 35 < 35 < 66 < 42 < 81 < 40 < 60 < 33 < 33 < 195 < 69 MEAN

Table C-IV.1 CONCENTRATIONS OF GAMMA EMITTERS IN SEDIMENT SAMPLES COLLECTED IN THE VICINITY OF DRESDEN NUCLEAR POWER STATION, 2022 RESULTS IN UNITS OF PCI/KG DRY+/- 2 SIGMA COLLECTION SITE PERIOD Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 Cs-134 Cs-137 Ba-140 La-140 D-27 05/17/22 < 78 < 62 < 185 < 100 < 173 < 75 < 141 < 95 129 +/- 71 < 352 < 117 10/29/22 < 76 < 58 < 184 < 111 < 203 < 81 < 124 < 106 < 132 < 309 < 83 MEAN 129 +/- 0 C)

I 0)

Table C-V.1 CONCENTRATIONS OF GROSS BETA IN AIR PARTICULATE SAMPLES COLLECTED IN THE VICINITY OF DRESDEN NUCLEAR POWER STATION, 2022 RESULTS IN UNITS OF E-3 PCI/CU METER +/- 2 SIGMA COLLECTION GROUP I GROUP II PERIOD 0-01 D-02 D-03 0-04 D-07 0-45 0-53 0-56 D-58 12/31/21 - 01/08/22 32 +/- 5 22 +/- 4 28 +/- 4 39 +/- 5 33 +/- 5 30 +/- 4 42 +/- 5 26 +/- 4 33 +/- 5 01/08/22 - 01/15/22 29 +/- 5 23 +/- 5 30 +/- 5 39 +/- 6 35 +/- 5 24 +/- 5 33 +/- 5 25 +/- 5 35 +/- 5 01/15/22 - 01/21/22 25 +/- 5 23 +/- 5 23 +/- 5 29 +/- 5 29 +/- 5 22 +/- 5 31 +/- 6 22 +/- 5 30 +/- 6 01/21/22 - 01/28/22 22 +/- 5 16 +/- 4 25 +/- 5 28 +/- 5 28 +/- 5 18 +/- 4 22 +/- 5 19 +/- 4 23 +/- 5 01 /28/22 - 02/04/22 33 +/- 5 20 +/- 4 23 +/- 5 33 +/- 5 27 +/- 5 22 +/- 5 28 +/- 5 24 +/- 5 28 +/- 5 02/04/22 - 02/ 11 /22 26 +/- 5 21 +/- 4 22 +/- 5 29 +/- 5 30 +/- 5 21 +/-5 31 +/-5 19 +/- 4 28 +/- 5 02/11/22 - 02/18/22 23 +/- 5 20 +/- 4 22 +/- 5 31 +/- 5 26 +/- 5 23 +/-5 29 +/- 5 20 +/- 4 26 +/- 5 02/18/22 - 02/25/22 16 +/- 5 14 +/- 4 17 +/- 5 22 +/- 5 18 +/- 5 16 +/- 5 16 +/- 5 16 +/- 5 18 +/- 5 02/25/22 - 03/04/22 24 +/- 5 20 +/- 4 27 +/- 5 37 +/- 5 31 +/- 5 23 +/- 5 29 +/- 5 18 +/- 4 28 +/- 5 03/04/22 - 03/ 11122 18 +/- 4 18 +/- 4 22 +/- 5 31 +/- 5 18 +/- 4 15 +/- 4 24 +/- 5 13 +/- 4 22 +/- 5 03/11/22 - 03/18/22 28 +/- 5 13 +/- 4 20 +/- 5 29 +/- 5 30 +/- 5 19 +/- 5 24 +/- 5 20 +/- 5 24 +/- 5 03/18/22 - 03/25/22 13 +/- 4 12 +/- 4 14 +/- 4 14 +/- 4 15 +/- 4 8 +/-4 17 +/- 4 11 +/- 4 15 +/- 4 03/25/22 - 04/02/22 13 +/- 4 8+/-3 12 +/- 3 15 +/- 4 17 +/- 4 17 +/- 4 14 +/- 4 9+/-4 13 +/- 4 04/01/22 - 04/08/22 8 +/- 4 <6 6+/-4 8 +/- 4 9+/-4 7 +/- 4 8 +/- 4 6+/-4 9+/-4 04/08/22 - 04/15/22 11 +/- 4 7 +/- 4 10 +/- 4 12 +/- 4 14 +/- 4 13 +/- 4 17 +/-4 16 +/- 4 13 +/- 4 04/15/22 - 04/22/22 13 +/- 4 15 +/- 4 12 +/- 4 10 +/- 4 14 +/- 4 14 +/-4 14 +/- 4 14 +/- 4 13 +/- 4 04/22/22 - 04/29/22 13 +/- 4 12 +/- 4 16 +/- 4 16 +/-4 15 +/- 4 15 +/-4 14 +/- 4 14 +/- 4 15 +/- 4 04/29/22 - 05/06/22 11 +/- 4 10 +/- 4 13 +/- 4 12 +/-4 12 +/- 4 9 +/- 3 13 +/-4 8 +/-3 12 +/- 4 05/06/22 - 05/13/22 17 +/- 4 21 +/- 4 21 +/- 4 23 +/-5 25 +/- 5 21 +/-5 24 +/- 5 21 +/- 4 23 +/- 5 05/13/22 - 05/20/22 20 +/- 5 18 +/- 4 16 +/- 4 18 +/- 4 22 +/- 5 19 +/- 4 20 +/- 5 17 +/- 4 21 +/- 5 05/20/22 - 05/27/22 10 +/- 4 10 +/- 4 13 +/- 4 13 +/- 4 13 +/- 4 13 +/- 4 10 +/- 4 13 +/- 4 12 +/- 4 05/27/22 - 06/03/22 12 +/- 4 16 +/- 5 15 +/- 5 14 +/- 4 13 +/- 4 15 +/- 4 15 +/- 4 12 +/- 4 15 +/- 4 06/03/22 - 06/10/22 16 +/- 4 21 +/- 5 20 +/- 5 15 +/- 4 20 +/- 5 17 +/-4 22 +/-5 18 +/- 5 20 +/- 5 06/10/22 - 06/17/22 19 +/- 5 25 +/- 5 16 +/- 4 24 +/- 5 21 +/- 5 24 +/- 5 20 +/- 5 22 +/- 5 19 +/- 5 06/17/22 - 06/24/22 10 +/- 4 10 +/- 4 12 +/- 4 10 +/- 4 13 +/- 4 10 +/-4 11 +/- 4 10 +/- 4 10 +/- 4 06/24/22 - 07/01/22 15 +/- 4 14 +/- 4 15 +/- 4 14 +/-4 15 +/- 4 19 +/- 4 14 +/- 4 14 +/- 4 18 +/- 4 07/01/22 - 07/08/22 16 +/- 4 22 +/- 5 15 +/- 4 17 +/-4 16 +/- 4 20 +/-4 19 +/-4 17 +/- 4 18 +/- 4 07/08/22 - 07/15/22 15 +/- 4 19 +/- 5 13 +/- 4 16 +/- 4 13 +/- 4 15 +/- 4 14 +/- 4 16 +/- 4 14 +/- 4 07/15/22 - 07/22/22 20 +/- 5 25 +/- 5 23 +/- 5 19 +/- 5 23 +/- 5 28 +/-5 22 +/-5 20 +/- 5 23 +/- 5 07/22/22 - 07/29/22 14 +/- 4 17 +/- 4 15 +/- 4 19 +/- 4 19 +/- 4 18 +/-4 16 +/- 4 16 +/- 4 17 +/- 4 07/29/22 - 08/05/22 15 +/- 4 16 +/- 4 18 +/- 5 15 +/-4 12 +/- 4 16 +/- 4 14 +/- 4 14 +/- 4 19 +/- 5 08/05/22 - 08/12/22 12 +/-4 17 +/- 4 17 +/- 4 13 +/- 4 14 +/- 4 16 +/- 4 16 +/- 4 15 +/- 4 16 +/- 4 08/12/22 - 08/19/22 21 +/- 4 21 +/- 4 20 +/- 4 18 +/- 4 19 +/- 4 23 +/- 4 24 +/- 5 23 +/- 4 25 +/- 5 08/19/22 - 08/26/22 20 +/- 4 26 +/- 5 27 +/- 5 20 +/- 4 24 +/- 5 28 +/- 5 28 +/- 5 22 +/- 4 23 +/- 5 08/26/22 - 09/02/22 19 +/- 4 20 +/- 4 20 +/- 4 17 +/- 4 20 +/- 4 23 +/- 4 20 +/-4 23 +/- 4 26 +/- 4 09/02/22 - 09/09/22 20 +/-4 22 +/- 5 22 +/- 5 17 +/- 4 23 +/- 5 20 +/- 4 18 +/-4 17 +/- 4 19 +/- 4 09/09/22 - 09/16/22 19 +/-4 21 +/- 4 22 +/- 5 18 +/- 4 19 +/- 4 23 +/-5 21 +/-4 19 +/- 4 21 +/- 4 09/16/22 - 09/23/22 22 +/- 5 21 +/- 5 23 +/- 5 18 +/- 4 20 +/- 4 24 +/-5 21 +/-5 20 +/- 4 22 +/- 5 09/23/22 - 09/30/22 12 +/-3 15 +/- 3 13 +/- 3 14 +/- 3 15 +/- 3 14 +/-4 15 +/- 4 13 +/- 3 15 +/- 4 09/30/22 - 10/07122 23 +/-5 19 +/- 5 17 +/- 5 21 +/- 5 20 +/- 5 18 +/- 4 16 +/-4 17 +/- 4 21 +/- 5 10/07/22 - 10/14/22 23 +/-5 28 +/- 5 26 +/- 5 23 +/- 5 24 +/- 5 31 +/-5 23 +/- 5 23 +/- 5 25 +/- 5 10/14/22 - 10/21/22 12 +/- 4 14 +/- 4 15 +/- 4 14 +/- 4 15 +/- 4 12 +/- 4 16 +/- 4 11 +/- 4 16 +/- 4 10/21/22 - 10/28/22 27 +/-5 29 +/- 5 26 +/- 5 23 +/- 4 26 +/- 5 30 +/- 5 24 +/-5 20 +/- 4 31 +/- 5 10/28/22 - 11 /04/22 39 +/-5 45 +/- 6 41 +/- 6 39 +/- 5 36 +/- 5 44 +/- 6 42 +/-6 41 +/- 6 49 +/- 6 11/04/22 - 11/11/22 19 +/- 5 23 +/- 5 17 +/- 4 21 +/- 5 18 +/- 4 24 +/- 5 19 +/- 5 20 +/- 5 23 +/- 5 11/11/22 - 11/18/22 11 +/-4 14 +/- 4 12 +/- 4 14 +/- 4 10 +/- 4 11 +/-4 9 +/- 3 11 +/- 4 13 +/- 4 11/18/22 - 11/25/22 33 +/- 5 36 +/- 5 36 +/- 5 34 +/- 5 31 +/- 5 37 +/- 5 29 +/- 5 37 +/- 5 35 +/- 5 11/25/22 - 12/02/22 26 +/-5 28 +/- 5 31 +/- 5 28 +/- 5 27 +/- 5 32 +/-5 26 +/-5 23 +/- 5 29 +/- 5 12/02/22 - 12/09/22 43 +/- 6 38 +/- 5 47 +/- 6 50 +/- 6 39 +/- 5 43 +/- 6 43 +/-6 36 +/- 5 45 +/- 6 12/09/22 - 12/16/22 21 +/- 4 23 +/- 5 29 +/- 5 26 +/- 5 24 +/- 5 19 +/- 4 21 +/- 4 20 +/- 4 23 +/- 4 12/16/22 - 12/23/22 29 +/- 5 30 +/- 5 34 +/- 5 34 +/- 5 19 +/- 4 36 +/- 5 30 +/-5 26 +/- 5 22 +/- 4 12/23/22 - 12/30/22 26 +/- 5 22 +/- 4 25 +/- 6 29 +/- 5 27 +/- 5 22 +/-5 29 +/- 5 22 +/- 4 29 +/- 5 MEAN+/- 2 STD DEV 20 +/- 16 20 +/- 15 21 +/- 16 22 +/- 18 21 +/- 14 21 +/- 16 2,1 +/- 16 19 +/- 14 22 +/- 16 THE MEAN AND 2 STANDARD DEVIATION ARE CALCULATED USING THE POSITIVE VALUES (1) SEE PROGRAM EXCEPTIONS SECTION FOR EXPLANATION C-7

Table C-V.1 CONCENTRATIONS OF GROSS BETA IN AIR PARTICULATE SAMPLES COLLECTED IN THE VICINITY OF DRESDEN NUCLEAR POWER STATION, 2022 RESULTS IN UNITS OF E-3 PCI/CU METER+/- 2 SIGMA COLLECTION GROUP Ill GROUP IV PERIOD D-08 D-10 D-14 D-55 D-12 12/31/21 - 01/08/22 29 +/- 4 47 +/- 5 27 +/- 4 37 +/- 5 (1) 01/08/22 - 01/15/22 25 +/- 5 34 +/- 5 28 +/- 5 37 +/- 6 (1) 01/15/22 - 01/21/22 20 +/- 5 35 +/- 6 22 +/- 5 26 +/- 5 (1) 01/21/22 - 01/28/22 21 +/- 5 25 +/- 5 21 +/- 5 25 +/- 5 (1) 01/28/22 - 02/04/22 23 +/- 5 30 +/- 5 22 +/- 5 26 +/- 5 (1) 02/04/22 - 02/11 /22 21 +/- 4 31 +/- 5 18 +/- 4 24 +/- 5 (1) 02/11 /22 - 02/18/22 22 +/- 5 34 +/- 5 18 +/- 4 24 +/- 5 (1) 02/18/22 - 02/25/22 16 +/- 5 21 +/- 5 11 +/- 4 19 +/- 5 (1) 02/25/22 - 03/04/22 23 +/- 4 32 +/- 5 23 +/- 5 25 +/- 5 (1) 03/04/22 - 03/11/22 21 +/- 5 26 +/- 5 15 +/- 4 22 +/- 5 20 +/- 7 03/11/22 - 03/18/22 15 +/- 4 30 +/- 5 15 +/- 4 23 +/- 5 20 +/- 5 03/18/22 - 03/25/22 10 +/- 4 15 +/- 4 8 +/- 4 13 +/- 4 13 +/- 4 03/25/22 - 04/02/22 14 +/- 4 18 +/- 4 11 +/- 3 12 +/- 3 13 +/- 4 04/01/22 - 04/08/22 < 6 9 +/- 5 6 +/- 4 8+/-4 7 +/- 4 04/08/22 - 04/15/22 13 +/- 4 16 +/- 4 12 +/- 4 12 +/- 4 13 +/- 4 04/15/22 - 04/22/22 14 +/- 4 12 +/- 4 10 +/- 4 18 +/- 4 14 +/- 4 04/22/22 - 04/29/22 17 +/- 4 13 +/- 4 14 +/- 4 16 +/- 4 15 +/- 4 04/29/22 - 05/06/22 13 +/- 4 11 +/- 4 9 +/- 3 12 +/- 4 13 +/- 4 05/06/22 - 05/13/22 19 +/- 4 18 +/- 4 24 +/- 5 19 +/- 4 22 +/- 5 05/13/22 - 05/20/22 15 +/- 4 18 +/- 4 18 +/- 4 19 +/- 4 19 +/- 4 05/20/22 - 05/27/22 11 +/- 4 12 +/- 4 10 +/- 4 11 +/- 4 11 +/- 4 05/27/22 - 06/03/22 9 +/- 4 15 +/- 5 9 +/- 4 14 +/- 4 14 +/- 7 06/03/22 - 06/10/22 17 +/- 4 21 +/- 5 19 +/- 5 16 +/- 4 (1) 06/10/22 - 06/17/22 16 +/- 4 20 +/- 5 20 +/- 5 20 +/- 5 (1) 06/17/22 - 06/24/22 11 +/- 4 13 +/- 4 12 +/- 4 12 +/- 4 11 +/- 4

. 06/24/22 - 07/01/22 13 +/- 4 18 +/- 4 13 +/- 4 16 +/- 4 15 +/- 4 07/01/22 - 07/08/22 18 +/- 4 18 +/- 4 21 +/- 4 19 +/- 4 18 +/- 4 07/08/22 - 07/15/22 24 +/- 5 11 +/- 4 14 +/- 4 12 +/- 4 18 +/- 5 07/15/22 - 07/22/22 22 +/- 5 28 +/- 5 21 +/- 5 19 +/- 5 23 +/- 5 07/22/22 - 07/29/22 19 +/- 4 17 +/- 4 17 +/- 4 15 +/- 4 18 +/- 4 07/29/22 - 08/05/22 15 +/- 4 15 +/- 4 13 +/- 4 21 +/- 5 19 +/- 5 08/05/22 - 08/12/22 15 +/- 4 15 +/- 4 16 +/- 4 15 +/- 4 16 +/- 4 08/12/22 - 08/19/22 24 +/- 4 26 +/- 5 21 +/- 4 21 +/- 4 24 +/- 5 08/19/22 - 08/26/22 27 +/- 5 24 +/- 5 21 +/- 4 25 +/- 5 25 +/- 5 08/26/22 - 09/02/22 23 +/- 4 23 +/- 4 19 +/- 4 23 +/- 4 19 +/- 4 09/02/22 - 09/09/22 22 +/- 5 20 +/- 4 18 +/- 4 20 +/- 4 16 +/- 4 09/09/22 - 09/16/22 28 +/- 5 20 +/- 4 22 +/- 4 19 +/- 4 19 +/- 4 09/16/22 - 09/23/22 22 +/- 5 22 +/- 5 22 +/- 5 23 +/- 5 23 +/- 5 09/23/22 - 09/30/22 15 +/- 4 15 +/- 3 14 +/- 4 19 +/- 4 16 +/- 4 09/30/22 - 10/07/22 24 +/- 5 20 +/- 5 17 +/- 4 19 +/- 4 21 +/- 4 10/07/22 - 10/14/22 25 +/- 5 27 +/- 5 20 +/- 5 23 +/- 5 25 +/- 5 10/14/22 - 10/21/22 11 +/- 4 8 +/- 4 13 +/- 4 11 +/- 4 14 +/- 4 10/21 /22 - 10/28/22 28 +/- 5 27 +/- 5 21 +/- 4 27 +/- 5 26 +/- 5 10/28/22 - 11 /04/22 47 +/- 6 39 +/- 5 43 +/- 6 44 +/- 6 40 +/- 6 11/04/22 - 11/11/22 21 +/- 5 19 +/- 4 23 +/- 5 16 +/- 4 20 +/- 5 11/11/22 - 11/18/22 12 +/- 4 13 +/- 4 10 +/- 4 10 +/- 4 12 +/- 4 11/18/22 - 11/25/22 37 +/- 5 35 +/- 5 35 +/- 5 35 +/- 5 35 +/- 5 11/25/22 - 12/02/22 26 +/- 5 31 +/- 5 28 +/- 5 33 +/- 5 27 +/- 5 12/02/22 - 12/09/22 43 +/- 6 42 +/- 6 41 +/- 6 40 +/- 5 44 +/- 6 12/09/22 - 12/16/22 18 +/- 4 23 +/- 5 20 +/- 4 20 +/- 4 25 +/- 5 12/16/22 - 12/23/22 36 +/- 5 29 +/- 5 28 +/- 5 28 +/- 5 32 +/- 5 12/23/22 - 12/30/22 24 +/- 5 26 +/- 5 17 +/- 4 18 +/- 4 24 +/- 5 MEAN +/- 2 STD DEV 21 +/- 16 22 +/- 18 19 +/- 15 21 +/- 16 20 +/- 16 THE MEAN AND 2 STANDARD DEVIATION ARE CALCULATED USING THE POSITIVE VALUES (1) SEE PROGRAM EXCEPTIONS SECTION FOR EXPLANATION C-8

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, 2022 RESULTS IN UNITS OF E-3 PCI/CU METER +/- 2 SIGMA GROUP 1- ON-SITE LOCATIONS GROUP II - NEAR-FIELD LOCATIONS GROUP lll

  • FAR-FIELD LOCATIONS GROUP IV - CONTROL LOCATION COLLECTION MIN MAX MEAN COLLECTION MIN MAX MEAN COLLECTION MIN MAX MEAN COLLECTION MIN MAX MEAN PERIOD +/-2SD PERIOD +/-2SD PERIOD +/-2SD PERIOD +/-2SD 12/31/21 - 02/04/22 16 33 25 +/- 9 12/31/21 - 02/04/22 18 42 28 +/- 12 12/31/21 - 02/04/22 20 47 28 +/- 14 (1) 02/04/22 - 03/04/22 14 27 21 +/- 8 02/04/22 - 03/04122 16 37 24 +/- 12 02/04/22 03/04/22 11 34 23 +/- 12 (1) 03/04/22 04/02/22 8 28 16 +/- 11 03/04/22 - 04/02/22 8 31 18 +/- 13 03/04/22 - 04/02/22 8 30 17 +/- 12 03/04/22 - 04/02/22 13 20 17 +/- 8 04/01/22 - 04/29/22 6 16 11 +/- 6 04/01/22 - 04/29122 6 17 13 +/- 6 04102122 04/29/22 6 18 13 +/- 6 04/02/22 - 04/29/22 7 15 12 +/- 7 04/29/22 - 06/03/22 10 21 15 +/- 8 04/29/22 - 06/03/22 8 25 16 +/- 10 04/29/22 - 06/03/22 9 24 14 +/- B 04/29/22 - 06/03/22 11 22 16 +/- 9 06/03/22 - 07/02122 10 25 16 +/- 9 06/03/22 - 07/02/22 10 24 17 +/- 9 06/03/22 - 07/02/22 11 21 16 +/- 7 06/17/22 - 07/01/22 11 15 13 +/- 5 07102/22 - 07/29/22 13 25 18 +/- 8 07/01/22 - 07/29/22 13 28 18 +/- 7 07/01/22 07/29/22 11 2B 18 +/- 9 07/01 /22 - 07/29/22 18 23 19 +/- 4 07/29/22 09/02/22 12 27 19 '+/- 7 07/29/22 - 09/02/22 12 28 19 '+/- 9 07/29/22 - 09/02/22 13 27 20 +/- 9 07129/22 - 09/02/22 16 25 20 +/- 7 09/02/22 10/01/22 12 23 19 '+/- 8 09/02/22 - 10/01/22 13 24 19 +/- 6 09/02/22 10/01/22 14 2B 20 +/- 7 09/02/22 - 09/30/22 16 23 19 +/- 6 10/01/22 - 10/28/22 12 29 22 +/- 12 09/30/22 - 10/28/22 11 31 21 +/- 11 09/30/22 10/28122 B 28 20 +/- 13 09/30/22
  • 10/28/22 14 26 21 +/- 11 10/28/22 - 12/02/22 11 45 27 +/- 22 10/28/22 - 12/02/22 9 49 27 +/- 22 10/28/22 12/02/22 10 47 28 +/- 24 . 10/28/22 - 12/02/22 12 40 27 +/- 22 12/02/22 - 12/30/22 21 47 31 +/- 17 12/02/22 - 12130/22 19 50 30 +/- 18 12102/22 - 12/30122 17 43 28 +/- 18 12/02/22 - 12/30/22 24 44 31 +/- 19

(")

I co 12/31/21 - 12/30122 6 47 20 +/- 15 12/31121 - 12/30/22 6 50 21 +/- 16 12/31/21 - 12/30/22 6 47 21 +/- 16 03/04/22 - 12/30/22 7 44 20 +/- 16 (1) SEE PROGRAM EXCEPTIONS SECTION FOR EXPLANATION

Table C-V.3 CONCENTRATIONS OF GAMMA EMITTERS IN AIR PARTICULATE SAMPLES COLLECTED IN THE VICINITY OF DRESDEN NUCLEAR POWER STATION, 2022 RESULTS IN UNITS OF E-3 PCI/CU METER+/- 2 SIGMA COLLECTION SITE PERIOD Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 Cs-134 Cs-137 Ba-140 La-140 D-01 12/31/21 - 04/01/22 < 1 < 2 <4 < 1 < 3 < 1 < 3 < 2 < 1 < 14 < 6 04/01/22 - 07/02/22 < 3 < 3 <9 < 2 < 6 < 3 < 5 < 3 < 3 < 20 < 11 07/02/22 - 10/01/22 < 3 < 3 < 8 < 3 < 8 < 3 < 6 < 3 < 3 < 29 < 7 10/01 /22 - 12/30/22 < 3 < 2 < 6 < 2 < 7 < 3 < 6 < 3 < 3 < 20 < 8 MEAN D-02 12/31/21 - 04/02/22 <2 < 2 < 5 < 2 <4 <2 <4 <2 <2 < 18 < 9 04/02/22 - 07/02/22 < 2 < 3 < 5 < 2 <4 < 3 <4 <2 < 2 < 15 < 6 07/02/22 - 10/01/22 < 2 < 2 < 5 < 3 <5 < 3 <5 <2 <2 < 15 < 10 10/01 /22 - 12/30/22 < 2 < 2 < 5 < 2 < 6 < 2 <3 < 3 < 2 < 15 < 6 MEAN D-03 12/31/21 - 04/02/22 <2 < 2 < 6 <2 < 5 <2 < 5 < 2 <2 < 23 < 7 04/02/22 - 07/02/22 <2 < 2 < 5 <2 < 4 <2 <4 <2 < 2 < 15 < 6 07/02/22 - 10/01/22 < 1 < 2 < 4 <2 < 3 < 3 <4 <2 <2 < 18 <4 10/01/22 - 12/30/22 < 2 < 3 < 4 < 2 < 6 < 2 <4 <2 <2 < 12 < 6 C) MEAN I

~

0 D-04 12/31/21 - 04/01/22 < 1 < 1 < 3 < 1 <2 < 1 < 2 < 1 < 1 < 13 < 5 04/01/22 - 07/02/22 < 3 <3 < 7 < 3 <8 < 3 < 6 < 3 < 3 < 21 < 5 07/02/22 - 10/01/22 < 2 < 2 <4 < 2 <5 <2 < 5 < 2 < 2 < 19 < 11 10/01/22 - 12/30/22 < 2 <2 < 3 < 3 <4 <2 < 3 < 2 < 1 < 13 <6 MEAN D-07 12/31/21 - 04/01/22 < 1 < 2 < 4 <2 < 3 <2 < 3 < 1 < 1 < 17 < 8 04/01/22 - 07/02/22 <2 < 3 < 6 < 3 < 5 < 2 <4 <2 < 2 < 17 < 10 07/02/22 - 10/01/22 < 3 < 3 < 8 < 3 < 6 < 2 <4 < 3 < 3 < 27 < 7 10/01/22 - 12/30/22 < 2 < 2 <4 <2 < 7 < 2 < 3 <2 < 2 < 13 < 7 MEAN D-08 12/31/21 - 04/02/22 < 2 < 3 < 6 < 3 < 5 < 2 <5 < 2 < 2 < 23 < 11 04/02/22 - 07/01/22 < 3 < 4 < 8 < 3 < 6 <4 <4 < 3 < 3 < 22 < 10 07/01/22 - 10/01/22 < 3 < 3 < 5 < 3 < 9 <4 <5 <2 < 2 < 23 < 6 10/01 /22 - 12/30/22 < 3 < 3 < 6 < 3 < 7 < 3 <5 <4 < 3 < 25 < 8 MEAN D-10 12/31 /21 - 04/02/22 < 2 < 2 < 6 <2 < 5 < 2 <3 < 2 < 2 < 22 < 6 04/02/22 - 07/02/22 < 1 < 2 < 3 < 2 < 6 < 2 <3 < 2 < 2 < 14 < 5 07102/22 - 10/01 /22 < 2 < 3 < 6 < 1 < 6 < 2 <4 < 2 < 2 < 22 < 11 10/01 /22 - 12/30/22 < 2 < 2 < 5 < 2 < 6 < 2 <4 < 2 < 2 < 17 <6 MEAN

Table C-V.3 CONCENTRATIONS OF GAMMA EMITTERS IN AIR PARTICULATE SAMPLES COLLECTED IN THE VICINITY OF DRESDEN NUCLEAR POWER STATION, 2022 RESULTS IN UNITS OF E-3 PCI/CU METER+/- 2 SIGMA COLLECTION SITE PERIOD Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 Cs-134 Cs-137 Ba-140 La-140 D-12 03/04/22 - 04/02/22 < 5 < 8 < 21 < 6 < 16 < 7 < 14 < 6 < 5 < 68 < 34 04/02/22 - 07/01/22 < 2 < 3 < 7 < 3 < 6 <2 < 5 < 2 < 3 < 20 < 5 07/01/22 - 09/30/22 < 3 < 3 < 7 < 3 < 7 <3 < 6 < 3 < 3 < 29 < 5 09/30/22 - 12/30/22 < 3 < 3 < 7 < 3 < 7 < 3 < 5 < 3 < 3 < 20 < 8 MEAN D-14 12/31 /21 - 04/02/22 < 2 < 2 < 6 <3 < 5 < 3 <4 < 3 < 2 < 22 < 13 04/02/22 - 07/01/22 < 2 < 3 < 6 <2 <6 < 3 <5 < 3 < 3 < 19 < 10 07/01/22 - 09/30/22 < 2 < 2 <4 < 2 < 5 < 2 <3 < 2 < 2 < 21 <6 09/30/22 - 12/30/22 < 1 < 2 < 6 < 2 < 5 < 2 <4 < 2 < 2 < 13 < 9 MEAN D-45 12/31/21 - 04/02/22 < 1 < 2 < 5 < 2 <5 < 2 <3 < 2 < 1 < 18 <4 04/02/22 - 07/01/22 < 2 < 2 < 7 < 2 <5 < 3 <4 < 2 < 1 < 24 < 10 07/01/22 - 09/30/22 < 2 < 2 <4 < 2 < 5 < 2 <3 < 2 < 2 < 15 < 11 09/30/22 - 12/30/22 < 2 < 2 < 5 < 2 <4 < 2 <4 < 2 < 2 < 16 < 5

() MEAN I

D-53 12/31/21 - 04/01/22 < 3 <4 < 7 < 3 < 3 < 3 < 5 < 3 < 3 < 32 < 10 04/01/22 - 07/02/22 < 2 < 2 < 6 < 2 < 5 < 2 < 5 < 2 < 2 < 23 < 10 07/02/22 - 10/01/22 < 3 < 3 < 5 < 2 < 7 < 3 < 6 < 2 <2 < 27 < 12 10/01 /22 - 12/30/22 < 3 <4 < 6 < 3 < 8 <4 < 5 < 2 < 3 < 24 < 10 MEAN D-55 12/31/21 - 04/02/22 < 2 < 2 < 5 < 2 < 3 <2 <4 < 2 < 2 < 23 < 6 04/02/22 - 07/01/22 < 2 <4 < 9 < 3 < 7 <4 <5 < 3 < 3 < 35 < 14 07101 /22 - 09/30/22 < 2 < 2 < 5 < 2 < 6 <2 <2 < 2 <2 < 19 < 7 09/30/22 - 12/30/22 < 2 < 2 < 5 < 2 < 5 <2 <3 < 2 <2 < 13 < 5 MEAN D-56 12/31/21 - 04/01/22 < 2 < 3 < 6 < 3. <6 < 3 < 6 < 2 < 3 < 27 < 9 04/01/22 - 07/02/22 < 2 < 1 < 5 <3 < 5 < 2 <4 < 2 <2 < 22 < 7 07/02/22 - 10/01/22 < 2 < 2 < .5 <3 <4 < 2 <4 < 2 <2 < 20 < 7 10/01 /22 - 12/30/22 < 3 < 3 < 7 < 2 <5 < 3 <4 < 3 < 3 < 20 < 8 MEAN D-58 12/31/21 - 04/01/22 < 3 <4 < 8 <4 <7 <4 < 6 <4 < 3 < 37 < 12 04/01/22 - 07/02/22 < 3 < 2 < 6 <2 <7 < 3 <5 < 3 < 3 < 26 < 10 07/02/22 - 10/01/22 < 3 < 3 < 7 <3 < 6 < 4 < 6 <4 < 3 < 30 < 10 10/01 /22 - 12/30/22 < 3 < 3 < 5 < 2 <4 < 2 <4 < 3 <2 < 20 < 5 MEAN

Table C-Vl.1 CONCENTRATIONS OF I-131 IN AIR IODINE SAMPLES COLLECTED IN THE VICINITY OF DRESDEN NUCLEAR POWER STATION, 2022 RESULTS IN UNITS OF E-3 PCI/CU METER+ 2 SIGMA COLLECTION PERIOD D-01 GROUP I D-02 D-03 I D-04 D-07 D-45 GROUP II D-53 D-56 D-58 12/31/21 - 01/08/22 < 37 < 36 < 35 < 16 < 37 < 35 < 34 < 29 < 29 01/08/22 - 01/15/22 < 33 < 14 < 33 < 33 < 33 < 14 < 14 < 8 < 8 01/15/22 - 01/21/22 < 22 < 53 < 53 < 53 < 53 < 36 < 36 < 38 < 38 01/21/22 - 01/28/22 < 25 < 25 < 25 < 25 < 25 < 30 < 14 < 30 < 30 01/28/22 - 02/04/22 < 17 < 17 < 17 < 17 < 17 < 22 < 22 < 16 < 16 02/04/22 - 02/11/22 < 29 < 29 < 29 < 28 < 28 < 33 < 32 < 32 < 27 02/11 /22 - 02/18/22 < 17 < 39 < 39 < 39 < 40 < 27 < 33 < 31 < 31 02/18/22 - 02/25/22 < 26 < 12 < 26 < 26 < 26 < 22 < 51 < 51 < 51 02/25/22 - 03/04/22 < 43 < 44 < 44 < 33 < 33 < 19 < 18 < 18 < 18 03/04/22 - 03111122 < 36 < 36 < 17 < 36 < 36 < 27 < 28 < 28 < 28 03111122 - 03118122 < 26 < 26 < 26 < 26 < 30 < 25 < 30 < 30 < 30 03/18/22 - 03/25/22 < 13 < 32 < 32 < 32 < 32 < 14 < 30 < 30 < 29 03/25/22 - 04/02122 < 19 < 15 < 15 < 16 < 18 < 5 < 31 < 31 < 31 04101 /22 - 04108122 < 34 < 39 < 38 < 34 < 37 < 38 < 33 < 33 < 33 04108122 - 04115122 < 11 < 25 < 25 < 25 < 25 < 13 < 40 < 40 < 40 04115122 - 04122122 < 34 < 34 < 27 < 34 < 34 < 34 < 30 < 30 < 30 04122122 - 04129122 < 31 < 31 < 31 < 31 < 37 < 32 < 32 < 16 < 32 04129122 - 05106122 < 28 < 29 < 19 < 28 < 28 < 45 < 32 < 32 < 32 05106/22 - 05/13/22 < 59 < 59 < 58 < 59 < 25 < 28 < 22 < 26 < 26 05113122 - 05120122 < 18 < 42 < 42 < 42 < 42 < 37 < 31 < 31 < 31 05120122 - 05/27/22 < 44 < 44 < 43 < 44 < 19 < 28 < 27 < 27 < 27 05127122 - 06/03/22 < 30 < 30 < 30 < 12 < 30 < 45 < 38 < 38 < 38 06/03/22 - 06/10/22 < 14 < 33 < 33 < 33 < 33 < 54 < 45 < 13 < 13 06/10/22 - 06/17/22 < 23 < 55 < 53 < 55 < 55 < 39 < 38 < 38 < 26 06/17/22 - 06/24/22 < 30 < 25 < 29 < 30 < 30 < 36 < 47 < 47 < 47 06/24/22 - 07/01/22 < 34 < 33 < 35 < 34 < 35 < 33 < 27 < 18 < 27 07/01/22 - 07/08/22 < 34 < 35 < 18 < 34 < 34 < 44 < 31 < 31 < 31 07/08/22 - 07/15/22 < 41 < 41 < 40 < 17 < 41 < 18 < 47 < 47 < 47 07/15/22 - 07122/22 < 20 < 48 < 48 < 48 < 48 < 34 < 44 < 44 < 44 07122/22 - 07/29/22 < 33 < 33 < 33 < 33 < 28 < 40 < 42 < 42 < 42 07/29/22 - 08/05/22 < 26 < 26 < 18 < 26 < 26 < 13 < 29 < 29 < 29 08/05/22 - 08/12/22 < 36 < 36 < 36 < 36 < 19 < 35 < 30 < 30 < 30 08/12/22 - 08/19/22 < 31 < 31 < 26 < 31 < 31 < 52 < 37 < 37 < 37 08/19/22 - 08/26/22 < 50 < 50 < 50 < 21 < 50 < 34 < 21 < 21 < 21 08/26/22 - 09/02/22 < 59 < 59 < 59 < 28 < 59 < 52 < 53 < 52 < 52 09/02/22 - 09/09/22 < 42 < 43 < 18 < 42 < 43 < 43 < 40 < 40 < 39 09/09/22 - 09/16/22 < 34 < 34 < 24 < 34 < 34 < 48 < 36 < 36 < 36 09/16/22 - 09123/22 < 32 < 32 < 32 < 14 < 33 < 55 < 51 < 51 < 51 09/23/22 - 09/30/22 < 43 < 42 < 42 < 18 < 43 < 45 < 41 < 41 < 40 09/30/22 - 10/07/22 < 40 < 20 < 41 < 40 < 41 < 35 < 41 < 41 < 27 10/07/22 - 10/14/22 < 48 < 48 < 47 < 48 < 37 < 29 < 28 < 23 < 28 10/14/22 - 10/21 /22 < 20 < 30 < 30 < 30 < 30 < 45 < 33 < 33 < 15 10/21 /22 - 10128/22 < 38 < 39 < 39 < 39 < 16 < 37 < 28 < 28 < 28 10/28122 - 11104122 < 18 < 35 < 35 < 35 < 35 < 49 < 36 < 36 < 36 11/04/22 - 11/11/22 < 48 < 48 < 48 < 20 < 48 < 39 < 49 < 48 < 48 11/11/22 - 11118/22 < 24 < 36 < 36 < 36 < 37 < 34 < 26 < 28 < 28 11/18122 - 11125122 < 15 < 30 < 30 < 30 < 30 < 34 < 26 < 22 < 26 11 /25/22 - 12/02122 < 20 < 20 < 20 < 20 < 10 < 21 < 14 < 17 < 17 12/02/22 - 12/09/22 < 32 < 32 < 32 < 32 < 22 < 34 < 33 < 34 < 29 12/09/22 - 12/16/22 < 29 < 29 < 29 < 29 < 13 < 48 < 33 < 33 < 33 12116/22 - 12123/22 < 42 < 42 < 42 < 42 < 21 < 38 < 38 < 40 < 40 12/23/22 - 12/30/22 < 41 < 40 < 24 < 41 < 41 < 26 < 28 < 28 < 27 MEAN (1) SEE PROGRAM EXCEPTIONS SECTION FOR EXPLANATION C-12

Table C-Vl.1 CONCENTRATIONS OF I-131 IN AIR IODINE SAMPLES COLLECTED IN THE VICINITY OF DRESDEN NUCLEAR POWER STATION, 2022 RESULTS IN UNITS OF E-3 PCI/CU METER+ 2 SIGMA COLLECTION GROUP Ill GROUP IV PERIOD D-08 D-10 D-14 D-55 D-12 12/31/21 - 01/08/22 < 34 < 14 < 35 < 30 (1) 01/08/22 - 01/15/22 < 14 < 12 < 14 < 8 (1) 01/15/22 - 01/21/22 < 36 < 36 < 24 < 38 (1) 01/21/22 - 01/28/22 < 25 < 25 < 13 < 30 (1) 01/28/22 - 02/04/22 < 9 < 22 < 22 < 16 (1) 02/04/22 - 02/11/22 < 28 < 28 < 12 < 33 (1) 02/11/22 - 02/18/22 < 33 < 33 < 33 < 31 (1) 02/18/22 - 02/25/22 < 30 < 30 < 30 < 52 (1) 02/25/22 - 03/04/22 < 33 < 33 < 28 < 18 (1) 03/04/22 - 03/11/22 < 27 < 27 < 27 < 29 < 41 03/11/22 - 03/18/22 < 26 < 30 < 30 < 30 < 30 03/18/22 - 03/25/22 < 30 < 30 < 30 < 30 < 30 03/25/22 - 04/02/22 < 5 < 5 < 5 < 26 < 5 04/01/22 - 04/08/22 < 43 < 20 < 42 < 32 < 43 04/08/22 - 04/15/22 < 27 < 27 < 28 < 41 < 27 04/15/22 - 04/22/22 < 34 < 34 < 14 < 31 < 34 04/22/22 - 04/29/22 < 37 < 37 < 16 < 32 < 37 04/29/22 - 05/06/22 < 20 < 48 < 45 < 29 < 48 05/06/22 - 05/13/22 < 30 < 30 < 32 < 28 < 30 05/13/22 - 05/20/22 < 37 < 37 < 17 < 31 < 37 05/20/22 - 05/27/22 < 19 < 28 < 28 < 28 < 28 05/27/22 - 06/03/22 < 44 < 44 < 45 < 39 < 32 06/03/22 - 06/10/22 < 54 < 54 < 54 < 13 (1) 06/10/22 - 06/17/22 < 39 < 39 < 39 < 39 (1) 06/17/22 - 06/24/22 < 36 < 35 < 36 < 48 < 24 06/24/22 - 07/01/22 < 22 < 36 < 44 < 33 < 43 07/01/22 - 07/08/22 < 44 < 21 < 44 < 29 < 44 07/08/22 - 07/15/22 < 43 < 43 < 43 < 48 < 43 07/15/22 - 07/22/22 < 29 < 34 < 35 < 44 < 34 07/22/22 - 07/29/22 < 40 < 40 < 40 < 43 < 19 07/29/22 - 08/05/22 < 27 < 27 < 28 < 30 < 27 08/05/22 - 08/12/22 < 35 < 35 < 23 < 30 < 35 08/12/22 - 08/19/22 < 51 < 51 < 22 < 38 < 52 08/19/22 - 08/26/22 < 14 < 34 < 34 < 21 < 34 08/26/22 - 09/02/22 < 61 < 61 < 63 < 53 < 61 09/02/22 - 09/09/22 < 43 < 43 < 44 < 40 < 19 09/09/22 - 09/16/22 < 20 < 48 < 48 < 36 < 48 09/16/22 - 09/23/22 < 54 < 54 < 23 < 51 < 54 09/23/22 - 09/30/22 < 39 < 38 < 19 < 47 < 45 09/30/22 - 10/07/22 < 38 < 18 < 35 < 38 < 35 10/07/22 - 10/14/22 < 16 < 37 < 38 < 29 < 38 10/14/22 - 10/21/22 < 19 < 45 < 45 < 33 < 45 10/21/22 - 10/28/22 < 37 < 37 < 37 < 29 < 17 10/28/22 - 11/04/22 < 48 < 48 < 23 < 37 < 48 11/04/22 - 11/11/22 < 39 < 38 < 16 < 49 < 39 11/11/22 - 11/18/22 < 34 < 34 < 16 < 28 < 34 11/18/22 - 11/25/22 < 34 < 34 < 34 < 27 < 15 11/25/22 - 12/02/22 < 20 < 20 < 11 < 17 < 20 12/02/22 - 12/09/22 < 52 < 52 < 52 < 34 < 52 12/09/22 - 12/16/22 < 20 < 47 < 48 < 34 < 47 12/16/22 - 12/23/22 < 19 < 37 < 38 < 41 < 37 12/23/22 - 12/30/22 < 58 < 58 < 60 < 28 < 59 MEAN (1) SEE PROGRAM EXCEPTIONS SECTION FOR EXPLANATION C-13

Table C-Vll.1 CONCENTRATIONS OF GAMMA EMITTERS IN VEGETATION SAMPLES COLLECTED IN THE VICINITY OF DRESDEN NUCLEAR POWER STATION, 2022 RESULTS IN UNITS OF PCI/KG WET+/- 2 SIGMA COLLECTION SITE PERIOD Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 1-131 Cs-134 Cs-137 Ba-140 La-140 D-25 Lettuce 06/17/22 < 29 < 26 < 75 < 41 < 76 < 28 < 36 < 34 < 29 < 37 < 112 < 40 Radish 06/17/22 < 32 < 30 < 49 < 38 < 68 < 33 < 55 < 35 < 32 < 32 < 112 < 45 Turnips 07/08/22 < 15 < 14 < 28 < 19 < 29 < 15 < 22 < 17 < 16 < 15 < 58 < 13 Swiss chard 07/08/22 < 15 < 14 < 32 < 18 < 36 < 14 < 26 < 20 < 15 < 14 < 59 < 17 Kale 07/08/22 < 13 < 13 < 28 < 15 < 31 < 13 < 24 < 17 < 16 < 15 < 52 < 16 Turnips 08/19/22 < 29 < 26 < 63 < 28 < 50 < 31 < 49 < 42 < 34 < 29 < 130 < 28 Collard greens 08/19/22 < 35 < 28 < 79 < 33 < 73 < 35 < 55 < 29 < 38 < 34 < 148 < 48 Kale 08/19/22 < 25 < 22 < 51 < 26 < 54 < 27 < 43 < 36 < 27 < 26 < 108 < 35 Radish 09/09/22 < 16 < 25 < 43 < 28 < 51 < 21 < 44 < 34 < 24 < 19 < 92 < 17 Swiss chard 09/09/22 < 39 < 36 < 78 < 56 < 90 < 36 < 58 < 46 < 43 < 38 < 195 < 41 Kale 09/09/22 < 48 < 37 < 89 < 36 < 105 < 40 < 62 < 59 < 35 < 42 < 148 < 62 Collard greens 10/07/22 < 20 < 22 < 41 < 23 < 48 < 27 < 34 < 31 < 22 < 22 < 94 < 29 Swiss chard 10/07/22 < 16 < 17 < 34 < 16 < 36 < 15 < 28 < 21 < 17 < 16 < 64 < 18 Turnips 10/07/22 < 16 < 15 < 28 < 17 < 40 < 16 < 24 < 20 < 17 < 17 < 61 < 18 0I MEAN

~

.i:,. D-39 Kohlrabi 07/15/22 < 17 < 19 < 49 < 35 < 61 < 25 < 44 < 28 < 29 < 20 < 98 < 36 Turnip 07/15/22 < 17 < 16 < 43 < 14 < 35 < 18 < 26 < 24 < 21 < 17 < 81 < 26 Cabbage 07/15/22 < 15 < 14 < 31 < 17 < 32 < 15 < 26 < 20 < 16 < 15 < 50 < 15 Cabbage 08/19/22 < 21 < 20 < 41 < 23 < 45 < 19 < 35 < 27 < 21 < 20 < 83 < 26 Red Beets 08/19/22 < 39 < 33 < 80 < 48 < 84 < 35 < 56 < 44 < 43 < 37 < 144 < 50 Rhubarb 08/19/22 < 35 < 34 < 73 < 37 < 75 < 30 < 55 < 39 < 28 < 31 < 116 < 50 Turnips 09/09/22 < 30 < 37 < 62 < 22 < 57 < 37 < 49 < 54 < 35 < 33 < 134 < 51 Rhubarb 09/09/22 < 46 < 41 < 90 < 40 < 87 < 39 < 71 < 58 < 47 < 44 < 155 < 54 MEAN D-42 Kale 07/15/22 < 31 < 26 < 60 < 32 < 71 < 31 < 49 < 52 < 34 < 30 < 141 < 42 Swiss chard 07/15/22 < 33 < 33 < 67 < 35 < 83 < 36 < 65 < 56 < 39 < 58 < 185 < 55 Kale 08/19/22 < 33 < 37 < 66 < 52 < 88 < 35 < 68 < 48 < 46 < 35 < 164 < 55 Swiss chard 08/19/22 < 31 < 28 < 66 < 27 < 68 < 33 < 58 < 46 < 37 < 49 < 134 < 35 Collard greens 08/19/22 < 28 < 24 < 71 <*47 < 58 < 39 < 54 < 47 < 38 < 29 < 130 < 32 Kale 09/09/22 < 34 < 27 < 55 < 34 < 55 < 34 < 44 < 38 < 35 < 28 < 147 < 21 Swiss chard 09/09/22 < 29 *< 35 < 77 < 39 < 69 < 40 < 64 < 44 < 37 < 48 < 151 < 53 Collard greens 09/09/22 < 29 < 31 < 68 < 40 < 85 < 27 < 56 < 34 < 40 < 33 < 116 < 50 Kale 10/07/22 < 18 < 16 < 31 < 20 < 34 < 16 < 27 < 20 < 18 < 18 < 64 < 17 Swiss chard 10/07/22 < 29 < 36 < 66 < 45 < 83 < 29 < 52 < 46 < 34 < 50 < 132 < 42 Collard greens 10/07/22 < 15 < 16 < 28 < 18 < 33 < 15 < 26 < 19 < 17 < 17 < 65 < 18 MEAN

Table C-Vll.1 CONCENTRATIONS OF GAMMA EMITTERS IN VEGETATION SAMPLES COLLECTED IN THE VICINITY OF DRESDEN NUCLEAR POWER STATION, 2022 RESULTS IN UNITS OF PCI/KG WET+/- 2 SIGMA COLLECTION SITE PERIOD Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 1-131 Cs-134 Cs-137 Ba-140 La-140 D-43 Collard greens 07108122 < 20 < 17 < 34 < 20 < 39 < 19 < 30 < 24 < 21 < 19 < 71 < 24 Swiss chard 07/08/22 < 31 < 32 < 70 < 39 < 63 < 32 < 47 < 39 < 33 < 27 < 135 < 33 Turnips 07/08/22 < 25 < 24 < 55 < 24 < 49 < 26 < 39 < 36 < 30 < 30 < 104 < 34 Collard greens 08/19/22 < 22 < 22 < 40 < 24 < 41 < 20 < 37 < 30 < 23 < 21 < 92 < 19 Swiss chard 08/19/22 < 29 < 27 < 62 < 33 < 59 < 31 < 48 < 47 < 32 < 33 < 127 < 30 Kale 08/19/22 < 19 < 18 < 39 < 20 < 38 < 19 < 33 < 24 < 20 < 20 < 78 < 25 Collard greens 09/09/22 < 33 < 30 < 72 < 31 < 77 < 42 < 67 < 53 < 43 < 30 < 147 < 60 Swiss chard 09/09/22 < 30 < 24 < 70 < 32 < 54 < 32 < 49 < 34 < 30 < 29 < 81 < 26 Turnips 09/09/22 < 21 < 22 < 45 < 22 < 53 < 18 < 34 < 28 < 21 < 20 < 74 < 27 MEAN D-44 Broccoli 07/08/22 < 29 < 26 < 62 < 28 < 57 < 35 < 48 < 38 < 33 < 33 < 130 < 41 Broccoli 08/19/22 < 41 < 40 < 68 < 46 < 91 < 36 < 61 < 55 < 44 < 42 < 172 < 40 Collard greens 08/19/22 < 15 < 14 < 32 < 16 < 34 < 17 < 27 < 20 < 17 < 17 < 58 < 15 C') Mustard Greens 08/19/22 < 14 < 15 < 33 < 15 < 33 < 16 < 25 < 18 < 17 < 16 < 63 < 21 I

~

Kale 09/09/22 < 23 < 26 < 49 < 29 < 58 < 20 < 49 < 38 < 30 < 28 < 114 < 35 C11 Swiss chard 09/09/22 < 43 < 41 < 89 < 38 < 101 < 36 < 70 < 52 < 42 < 47 < 167 < 56 Mustard Greens 09/09/22 < 20 < 19 < 54 < 24 < 44 < 20 < 31 < 27 < 25 < 20 < 80 < 26 Kale 10/07/22 < 33 < 37 < 69 < 37 < 56 < 37 < 65 < 53 < 40 < 38 < 171 < 37 Swiss chard 10/07/22 < 37 < 43 < 67 < 48 < 83 < 45 < 73 < 44 < 51 < 36 < 172 < 67 Collard greens 10/07/22 < 15 < 19 < 37 < 21 < 39 < 19 < 32 < 23 < 20 < 17 < 72 < 21 MEAN

Table C-V111.1 QUARTERLY DLR RES ULTS FOR DRESDEN NUCLEAR POWER STATION, 2022 Location Annual Annual BQ+ Normalized Net Dose, BA+ Normalized Qtrly Baseline, Facility Location MDDQ MQx (mrem/std. Qtr.) 121 Dose, MA Baseline, BA(1) MDDA Dose, FA BQ (mrem)

(mrem) (mrem) (mrem/yr) (mrem)

I I (mrem) 1 I 2 3 4 D-01 27.7 40.5 14 16 18 16 111 155 63 ND D-02 28.8 41.6 13 14 17 15 115 160 58 ND D-03 23.9 36.7 13 14 12 14 96 140 54 ND D-04 27.4 40.2 14 16 17 15 110 154 62 ND D-07 26.7 39.5 14 15 17 16 107 151 62 ND D-08 24.4 37.2 13 15 16 15 98 142 59 ND D-10 28.6 41.4 14 15 17 18 115 159 64 ND D-12 23.7 36.5 11 13 13 12 90 135 50 ND D-14 23.5 36.3 13 12 13 15 94 138 54 ND D-45 23.2 36.0 15 15 18 19 93 137 66 ND D-53 27.5 40.3 12 12 14 14 110 154 53 ND D-55 27.2 40.0 14 14 16 16 109 153 59 ND D-56 25.3 38.1 11 10 12 16 101 146 49 ND D-58 26.5 39.3 10 10 8 12 106 150 39 ND D-101 26.6 39.4 14 14 16 17 107 151 62 ND D-102 28.6 41.4 13 17 15 19 114 159 64 ND D-103 26.4 39.2 13 15 15 15 106 150 58 ND D-104 28.3 41.1 15 17 17 17 107 152 66 ND D-105 27.1 39.9 15 16 16 17 109 153 65 ND D-106 24.1 36.9 9 10 9 9 92 136 37 ND D-107 23.8 36.6 11 11 13 13 95 140 48 ND D-108 26.8 39.6 13 13 14 14 107 152 54 ND D-109 27.0 39.8 13 14 17 18 108 153 63 ND D-110 31.1 43.9 17 19 21 19 125 169 77 ND D-111 28.6 41.4 16 16 17 17 103 148 66 ND D-112A 25.3 38.1 9 9 16 15 101 146 49 ND D-113 25.1 37.9 12 14 15 15 96 140 56 ND D-114 24.6 37.4 11 11 12 14 98 143 49 ND D-115 27.5 40.3 14 15 18 15 110 155 63 ND D-116 29.4 42.2 15 16 18 19 118 162 69 ND D-201 30.8 43.6 13 17 17 19 111 155 66 ND D-202 27.6 40.4 15 16 17 18 105 149 65 ND D-203 26.2 39.0 10 13 14 15 94 139 52 ND D-204 24.4 37.2 10 11 10 13 98 142 45 ND D-205 23.3 36.1 13 15 17 17 93 138 62 ND D-206 26.6 39.4 13 14 15 18 101 146 60, ND D-207 24.8 37.6 11 11 12 13 99 144 47 ND D-208 23.0 35.8 10 9 12 10 92 136 41 ND D-209 23.1 35.9 10 9 10 11 92 137 40 ND D-210 26.1 38.9 13 13 16 18 105 149 60 ND D-211 27.7 40.5 14 15 17 13 111 155 58 ND D-212 24.5 37.3 10 11 14 13 98 142 48 ND D-213 23.1 35.9 9 11 14 13 93 137 48 ND D-214 31.0 43.8 14 16 16 16 124 168 61 ND D-215 29.9 42.7 15 18 17 16 120 164 67 ND D-216 28.0 40.8 13 14 14 15 106 151 56 ND 111 Baseline background dose (BB,J: The estimated mean background radiation dose at each field monitoring location annually based on historical measurements, excluding any dose contribution from the monitored facility 1' 1 Minimum differential dose (MDD,J: The smallest amount of facility related dose at each monitored location annually above the baseline background dose that can be reliably detected by an environmental dosimetry system C-16

FIGURE C-1 SURFACE WATER - GROSS BETA - STATION D-52 (C)

COLLECTED IN THE VICINITY OF DNPS, 2000 - 2022 D-52 (C) DesPlaines River at Will Road 16 14 12 10 6

4 2

0-i-------..--------,----------r-------,

01-28-00 10-21-05 07-15-11 04-07-17 12-30-22 DUE TO VENDOR CHANGE IN 2005, < VALUES ARE LLD VALUES JANUARY THROUGH JUNE 2005 AND MDC VALUES AFTER JULY 2005 C-17

FIGURE C-2 SURFACE WATER - GROSS BETA - STATION D-57 (C)

COLLECTED IN THE VICINITY OF DNPS, 2006 - 2022 D-57 (C) Kankakee River at Will Road 32 28 24

..J 20 i3a. 16 12 8

4 0

07-28-06 09-05-10 10-14-14 11-22-18 12-31-22 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 C-18

FIGURE C-3 SURFACE WATER - GROSS BETA - STATION D-21 COLLECTED IN THE VICINITY OF DNPS, 2000 - 2022 D-2.1 Illinois River at EJ&E Bridge 30 25 20 5

0 15 Q.

10 5

0 04-27-07 03-29-11 02-28-15 01-30-19 01-01-23

  • D-21 PLACED INTO SERVICE ON MARCH 30, 2007, REPLACED D-51 C-19

FIGURE C-4 SURFACE WATER -TRITIUM - STATION D-52 (C)

COLLECTED IN THE VICINITY OF DNPS, 2000 - 2022 D-52 (C) Des Plaines River at Will Road 600 500 400

! 300 c3C.

200 100 0

03-31-00 12-08-05 08-17-11 04-25-17 01-02-23 DUE TO VENDOR CHANGE IN 2005, < VALUES ARE LLD VALUES JANUARY THROUGH JUNE 2005 AND MDC VALUES AFTER JULY 2005 C-20

FIGURE C-5 SURFACE WATER-TRITIUM -STATION D-57 (C)

COLLECTED IN THE VICINITY OF DNPS, 2006 - 2022 D-57 (C) Kankakee River at Will Road 7000 6000 5000 4000 s0

0. 3000 2000 1000 0

12-20-06 12-23-10 12-26-14 12-29-18 01-01-23 DUE TO VENDOR CHANGE IN 2005, < VALUES ARE LLD VALUES JANUARY THROUGH JUNE 2005 AND MDC VALUES AFTER JULY 2005 C-21

FIGURE C-6 SURFACE WATER -TRITIUM - STATION D-21 COLLECTED IN THE VICINITY OF DNPS, 2007 - 2022 0-21 Illinois River at EJ&E Bridge 1600 1400 1200 1000

.J

. 800 CJ Cl.

600 400 200 0

06-29-07 05-15-11 03-31-15 02-14-19 12-31-22 D-21 REPLACED D-51 JUNE 29, 2007 C-22

FIGURE C-7 GROUND WATER-TRITIUM -STATION D-35 COLLECTED IN THE VICINITY OF DNPS, 2000 - 2022 D-35 Dresden Lock and Dam 400 350 300 250

.J

~C. 200 150 100 50 0

01-01-00 07-02-05 01-01-11 07-02-16 01-01-22 FIGURE C-8 GROUND WATER-TRITIUM - STATION D-39 COLLECTED IN THE VICINITY OF DNPS, 2022 D-39 Will Road Well 400

.J

~ 200 . ,,t>------0---------0 C. if 0---

0+------------------

01-01-22 03-01-22 05-01-22 07-01-22 09-01-22 11-01-22 01-01-23 DUE TO VENDOR CHANGE IN 2005, < VALUES ARE LLD VALUES JANUARY THROUGH JUNE 2005 AND MCD VALUES AFTER JULY 2005 C-23

FIGURE C-9 AIR PARTICULATES - GROSS BETA - STATIONS D-01 and D-02 COLLECTED IN THE VICINITY OF DNPS, 2000 - 2022 D-01 Onsite Station 1 50.0 40.0 M

.§ 30.0

~

M

~ 20.0 0

10.0 0.0 +-----...-----~------.------,

01-08-00 10-06-05 07-05-11 04-02-17 12-30-22 D-02 Onsite Station 2 50.0 40.0 M

E 30.0

~

M

'i' 20.0 w

0 10.0 0.0 - - - - - . . . - - - - - - - - - - - - - - - - - - - .

01-08-00 10-06-05 07-05-11 04-02-17 12-30-22 D-02 No samples; power was restored on 09-16-05.

C-24

FIGURE C-10 AIR PARTICULATES - GROSS BETA - STATIONS D-03 and D-04 COLLECTED IN THE VICINITY OF DNPS, 2000 - 2022 D-03 Onsite Station 3 60.0 50.0 M 40.0

§

~ 30.0 M

0 w 20.0 0

10.0 0.0 -----

01-08-00 - - - 05-11 10-06-05 - - - - 02-17

- - - - 30-22 D-04 Collins Road on Station Property 60.0 50.0 e 4o.o i1 Q. 30.0 M

9

~

.,.. 20.0 10.0 0.0 -----

01-08-00 - - - 05-11 10-06-05 - - - - 02-17

- - - - 30-22 D-03 No samples; power was restored on 07-04-14.

FIGURE C-11 AIR PARTICULATES - GROSS BETA - STATIONS D-07 and D-12 (C)

COLLECTED IN THE VICINITY OF DNPS, 2000 - 2022 D-07 Clay Produ*cts, Dresden Road 120.0 100.0 M

80.0

~

0 C.

M 60.0 q

w 0

40.0 20.0 0.0 01-08-00 10-06-05 07-05-11 04-02-17 12-30-22 D-12 (C), Quarry Road, Lisbon 80.0 60.0 M

.§ 0

c. 40.0 M

0 w

0 20.0 0.0 + - - - - - + - - - - - + - - - - - - + - - - - - - I 01-08-00 10-06-05 07-05-11 04-02-17 12-30-22 C-26

FIGURE C-12 AIR PARTICULATES - GROSS BETA- STATIONS D-45 and D-53 COLLECTED IN THE VICINITY OF DNPS, 2000 - 2022 D-45 McKinley Woods Road, Channahon 70.0 60.0 c-, 50.0

§

'is_ 40.0

~ 30.0 w

~ 20.0 10.0 0.0 +----'-----'-----1!-------+------+--------1 01-08-00 10-06-05 07-05-11 04-02-17 12-30-22 D-53 Will Road, Hollyhock 50.0 40.0 M

§ 30.0

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FIGURE C-13 AIR PARTICULATES - GROSS BETA-STATIONS D-08 and D-10 COLLECTED IN THE VICINITY OF DNPS, 2005 - 2022 D-08 Jugtown Road, Prairie Parks 70.0 60.0 50.0 M

~ 40.0 0

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FIGURE C-14 AIR PARTICULATES - GROSS BETA-STATION D-14 COLLECTED IN THE VICINITY OF DNPS, 2005 - 2022 D-14 Center Street, Channahon 50.0 40.0

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FIGURE C-15 AIR PARTICULATES - GROSS BETA -STATIONS D-55 and D-56 COLLECTED IN THE VICINITY OF DNPS, 2006 - 2022 D-55 Ridge Road, Minooka 70.0 60.0 50.0 M

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10.0 0.0 +----------------------1 07-25-06 09-03-10 10-13-14 11-22-18 01-01-23 D-55 NEW STATION DECEMBER 30, 2005 REPLACED D-13 JUNE 29, 2007 D-56 NEW STATION JULY 25, 2006 C-30

FIGURE C-16 AIR PARTICULATES - GROSS BETA - STATION D-58 COLLECTED IN THE VICINITY OF DNPS, 2011 - 2022 0-58 Will Road Marina 60.0 50.0

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D-58 NEW STATION IN MAY OF 2011 C-31

Intentionally left blank APPENDIX D INTER-LABORATORY COMPARISON PROGRAM

Intentionally left blank Analytics Environmental Radioactivity Cross Check Program Table D.1 Teled~ne Brown Engineering Environmental Services TBE Identification Known Ratio ofTBE to Month/Year Matrix Nuclide Units Reported Evaluation (bl Number Value (a) Analytics Result Value March 2022 E13706 Milk Sr-89 pCi/L 80.3 96.8 0.83 A Sr-90 pCi/L 12.7 12.6 1.01 A E13707 Milk Ce-141 pCi/L 62.3 65 0.96 A Co-58 pCi/L 158 164 o.~6 A Co-60 pCi/L 286 302 0.95 A Cr-51 pCi/L 314 339 0.93 A Cs-134 pCi/L 155 182 0.85 A Cs-137 pCi/L 210 223 0.94 A Fe-59 pCi/L 211 185 1.14 A 1-131 pCi/L 88.0 96.7 0.91 A Mn-54 pCi/L 169 164 1.03 A Zn-65 pCi/L 238 246 0.97 A E13708 Charcoal 1-131 pCi 79.9 87.1 0.92 A E13709 AP Ce-141 pCi 60.9 42.0 1.45 N(1J Co-58 pCi 118 107 1.11 A Co-60 pCi 218 196 1.11 A Cr-51 pCi 251 221 1.14 A Cs-134 pCi 129 118 1.09 A Cs-137 pCi 156 145.0 1.07 A Fe-59 pCi 124 120.0 1.03 A Mn-54 pCi 120 107 1.12 A Zn-65 pCi 162 160 1.01 A E13710 Soil Ce-141 pCi/g 0.123 0.103 1.19 A Co-58 pCi/g 0.254 0.263 0.97 A Co-60 pGitg 0.493 0.483 1.02 A Cr-51 pCi/g 0.603 0.543 1.11 A Cs-134 pCi/g 0.268 0.292 0.92 A Cs-137 pCi/g 0.399 0.431 0.93 A Fe-59 pCi/g 0.320 0.296 1.08 A Mn-54 pCi/g 0.263 0.263 1.00 A Zn-65 pCi/g 0.407 0.395 1.03 A E13711 AP Sr-89 pCi 83.2 97.4 0.85 A Sr-90 pCi 12.7 12.7 1.00 A (a) The Analytics known value is equal to 100% of the parameter present in the standard as determined by gravimetric and/or volumetric measurements made during standard preparation (b) Analytics evaluation based on TBE internal QC limits:

A= Acceptable - reported result falls within ratio limits of 0.80-1.20 W= Acceptable with warning- reported result falls within 0.70-0.80 or 1.20-1.30 N = Not Acceptable - reported result falls outside the ratio limits of< 0. 70 and > 1.30 (Page 1 of 2)

Analytics Environmental Radioactivity Cross Check Program Table D.1 Teledxne Brown En9ineering Environmental Services TBE Identification Known Ratio of TBE to MonthMear Matrix Nuclide Units Reported Evaluation (bl Number Value (a) Analytics Result Value September 2022 E13712 Milk Sr-89 pCi/L 71.1 89.1 0.80 A Sr-90 pCi/L 12.0 13.6 0.88 A E13713 Milk Ce-141 pCi/L 148 161 0.92 A Co-58 pCi/L 178 189 0 ..94 A Co-60 pCi/L 229 260 0,.88 A Cr-51 pCi/L 486 456 1.07 A Cs-134 pCi/L 220 252 0.87 A Cs-137 pCi/L 203 222 0.92 A Fe-59 pCi/L 174 173 1.01 A 1-131 pCi/L 75.9 94.2 0.81 A Mn-54 pCi/L 269 282 0.95 A Zn-65 pCi/L 364 373 0.97 A E13714

  • Charcoal 1-131 pCi 81.4 83.6 0.97 A E13715 AP Ce-141 pCi 102 91 1.12 A Co-58 pCi 118 107 1.11 A pCi 207 147 1.41 N(2l Co-60 Cr-51 pCi 310 257 1.21 w Cs-134 pCi 148 142 1.04 A Cs-137 pCi 137 125 1.10 A Fe-59 pCi 115 98 1.18 A Mn-54 pCi 168 159 1.05 A Zn-65 pCi 240 211 1.14 A E13716 Soil Ce-141 pCi/g 0.288 0.284 1.01 A Co-58 pCi/g 0.320 0.334 0.96 A Co-60 pCi/g 0.445 0.459 0.97 A Cr-51 pCi/g 0.883 0.805 1.10 A Cs-134 pCi/g 0.410 0.446 0.92 A Cs-137 pCi/g 0.447 0.465 0.96 A Fe-59 pCi/g 0.314 0.305 1.03 A Mn-54 pCi/g 0.489 0.499 0.98 A Zn-65 pCi/g 0.666 0.660 1.01 A E13717 AP Sr-89 pCi 87.5 98.3 0.89 A Sr-90 pCi 12.6 15.0 0.84 A (a) The Analytics known value is equal to 100% of the parameter present in the standard as determined by gravimetric and/or volumetric measurements made during standard preparation (b) Analytics evaluation based on TBE internal QC limits:

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

DOE's Mixed Analyte Performance Evaluation Program (MAPEP)

Table D.2 Teledlne Brown En9ineerin9 Environmental Services TSE Identification Known Acceptance Month/Year Matrix Nuclide Units Reported Evaluation (b)

Number Value (a) Range Value February 2022 22-GrF46 AP Gross Alpha Sq/sample 0.402 1.20 0.36-2.04 A Gross Beta Sq/sample 0.669 0.68 0.34:1 - 1.022 A 22-MaS46 Soil Ni-63 Bq/kg 645 780 546 -1014 A 526 545-1011 N(3)

Tc-99 Sq/kg 778 22-MaSU46 Urine Cs-134 Sq/L 1.67 1.77 1.24 - 2.30 A Cs-137 Bq/L 1.50 1.56 1.09-2.03 A Co-57 Bq/L 4.93 5.39 3.77 7.01 A Co-60 Bq/L 2.13 2.06 1.44 - 2.68 A Mn-54 Bq/L 4.83 5.08 3.56-6.60 A U-234 Sq/L 0.142 0.0074 0.0052 - 0.0096 N(4l U-238 Bq/L 0.0254 0.0103 0.0072 - 0.0134 N(4l Zn-65 Bq/L 4.71 4.48 3.14 - 5.82 A 22-MaW46 Water Ni-63 Bq/L 28.6 34.0 23.8-44.2 A Tc-99 Bq/L 8.59 7.90 5.5 -10.3 A 22-RdV46 Vegetation Cs-134 Sq/sample 6.61 7.61 5.33-9.89 A Cs-137 Sq/sample 1.50 1.52 1.06-1.98 A Co-57 Sq/sample 5.11 5.09 3.56-6.62 A Co-60 Sq/sample 0.0162 (1) A Mn-54 Sq/sample 2.42 2.59 1.81 - 3.37 A Sr-90 Sq/sample 0.684 0.789 0.552-1.026 A Zn-65 Bq/sample 1.44 1.47 1.03-1.91 A August2022 22-MaS47 Soil Ni-63 Bq/kg 14.6 (1) A Tc-99 Bq/kg 994 1000 700 - 1300 A 22-MaW47 Water Ni-63 Sq/L 24.4 32.9 23.0-42.8 A Tc-99 Sq/L 1.9 (1) N(sJ 25-RdV47 Vegetation Cs-134 Sq/sample 0.032 (1) A Cs-137 Sq/sample 0.891 1.08 0.758 - 1.408 A Co-57 Sq/sample 0.006 (1) A Co-60 Sq/sample 4.04 4.62 3.2,3 - 6.01 A Mn-54 Sq/sample 2.01 2.43 1.70-3.16 A Sr-90 Sq/sample 1.25 1.60 1.12 2.08 w Zn-65 Sq/sample 6.16 7.49 5.24-9.74 A (a) The MAPEP known value is equal to 100% of the parameter present in the standard as determined by gravimetric and/or volumetric measurements made during standard preparation (b) DOEIMAPEP evaluation:

A = Acceptable - reported result falls within ratio limits of 0. 80-1. 20 W = Acceptable with warning reported result falls within 0. 70-0.80 or 1.20-1.30 N = Not Acceptable - reported result falls outside the ratio limits of< 0.70 and> 1.30

( 1) False positive test (2) Sensitivity evaluation (3) Tc-99 soil cross-checks done for TBE information only- not required (4) See NCR 22-05 (Page 1 of 1)

ERA Environmental Radioactivity Cross Check Program Table D.3 Teledyne Brown Engineering Environmental Services Identification TSE Reported Known Acceptance Month/Year Matrix Nuclide Units Evaluation (bl Number Value Value<*> Limits March 2022 MRAD-36 Water Am-241 pCi/L 68.3 74.6 51.2 - 95.4 A Fe-55 pCi/L 797 1140 670 -1660 A Pu-238 pCi/L 146 147 88.4 - 190 A Pu-239 pCi/L 69.9 71.9 44.5 - 88.6 A Soil Sr-90 pCi/kg 8050 6720 2090-10500 A AP Fe-55 pCi/filter 148 127 46.4- 203 A Pu-238 pCi/filter 29.9 29.6 22.3 - 36.4 A Pu-239 pCi/filter 51.6 49.7 37.2 - 60.0 A U-234 pCi/filter 59.9 67.3 49.9 - 78.9 A U-238 pCi/filter 59.0 66.7 50.4 - 79.6 A GR-A pCi/filter 95.6 94.2 49.2 - 155 A GR-8 pCi/filter 71.2 66.8 40.5- 101 A April 2022 RAD-129 Water Ba-133 pCi/L 61.7 62.9 52.3 - 69.2 A Cs-134 pCi/L 80.9 81.6 68.8 - 89.8 A Cs-137 pCi/L 37.4 36.6 32.1 - 43.3 A Co-60 pCi/L 103 97.4 87.7 - 109 A Zn-65 pCi/L 318 302 272 - 353 A GR-A pCi/L 26.9 20.8 10.4.- 28.3 A GR-8 pCi/L 49.7 51.0 34.7 - 58.1 A U-Nat pCi/L 56.3 68.9 56.3,- 75.8 A H-3 pCi/L 17,000 18,100 15,800-19,000 A Sr-89 pCi/L 65.3 67.9 55.3 - 76.1 A Sr-90 pCi/L 42.1 42.7 31.5 - 49.0 A 1-131 pCi/L 25.7 26.2 21.8 - 30.9 A September 2022 MRAD-37 Water Am-241 pCi/L 111 96.2 66.0 - 123 A Fe-55 pCi/L 850 926 544 - 1350 A Pu-238 pCi/L 62.1 52.6 31.6 - 68.2 A Pu-239 pCi/L 139.5 117 72.5- 144 A Soil Sr-90 pCi/kg 3350 6270 1950 - 9770 A U-234 pCi/kg 1684 3350 1570 -4390 A U-238 pCi/kg 1658 3320 1820 -4460 N\S)

AP Fe-55 pCi/filter 71.9 122 44.5 - 195 A Pu-238 pCi/filter 38.8 29.9 22.6 - 36.7 Nll)

Pu-239 pCi/filter 14.5 13.0 9.73 -15.7 A U-234 pCi/filter 78.0 71.5 53.0 ~ 83.8 A U-238 pCi/filter 79.7 70.9 53.5 ~ 84.6 A GR-A pCi/filter 62.8 55.5 29.0 - 91.4 A GR-8 pCi/filter 70.9 64.8 39.3 - 97.9 A October 2022 RAD-131 Water Ba-133 pCi/L 76.2 79.4 66.6 - 87.3 A Cs-134 pCi/L 28.0 30.5 23.9- 33.6 A Cs-137 pCi/L 202 212 191 -235 A Co-60 pCi/L 52.4 51.4 46.3- 59.1 A Zn-65 pCi/L 216 216 194- 253 A GR-A pCi/L 19.7 16.9 8.28 - 23.7 A GR-8 pCi/L 49.8 53.0 36.1-60.0 A U-Nat pCi/L 10.54 8.53 6.60 - 9.88 Nl")

H-3 pCi/L 13,900 15,100 13,200 - 16,600 A Sr-89 pCi/L 59.7 64.5 52.3 - 72.5 A Sr-90 pCi/L 32.9 37.3 27.4*- 43.0 A 1-131 pCi/L 26.9 24.4 20.2 -28.9 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 22-19 (2) U soil cross-checks done for TBE information only - not required *

(3) See NCR 22-20 (Page 1 of 1)

APPENDIX E ERRATA DATA

There was no errata data for 2022.

APPENDIX F ANNUAL RADIOLOGICAL GROUNDWATER PROTECTION PROGRAM REPORT (ARGPPR)

Intentionally left blank 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 2022 Prepared By Teledyne Brown Engineering Environmental Services d 1 Co stellation Dresden Nuclear Power Station Morris, IL 60450 May 2023

Intentionally left blank 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 Ill. 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 ............................................................................... 1O E. Summary of Results - Inter-laboratory Comparison Program ........................... 10 F. Leaks, Spills, and Releases ............................................................................... 10 G. Trends ............................................................................................................... 1O H. Investigations ..................................................................................................... 11 I. Actions Taken ..................................................................................................... 11

-i-

Appendices ARGPPR Appendix A Location Designation Tables Table A-1 Radiological Groundwater Protection Program - Sampling Locations, Distance and Direction, Dresden Nuclear Power Station, 2022 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 8 Data Tables Tables Table 8-1.1 Concentrations of Tritium, Strontium, Gross Alpha and Gross Beta in Groundwater Samples Collected in the Vicinity of Dresden Nuclear Power Station, 2022 Table 8-1.2 Concentrations of Gamma Emitters in Groundwater Samples Collected in the Vicinity of Dresden Nuclear Power Station, 2022 Table B-1.3 Concentrations of Hard-To-Detects in Groundwater Samples Collected in the Vicinity of Dresden Nuclear Power Station, 2022 Table 8-11.1 Concentrations of Tritium in Precipitation Water Samples Collected in the Vicinity of Dresden Nuclear Power Station, 2022

- ii -

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 station's 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 8 precipitation water monitoring locations sampled as part of the Dresden RGPP. An additional 4 locations were studied in 2011 through 2012, but 8 locations are 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 2022, there were 264 analyses that were performed on 182 samples from 63 sampling points.

Sentinel Wells, sometimes referred to as "baby wells" are wells that were installed to monitor local shallow groundwater; typically associated with an historic underground pipe leak. Th~se 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 procequres 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 s.ubject to internal quality assurance programs, industry crosscheck programs, as well as nuclear industry audits. Station personnel review and evaluate the analytical results.

D. c.haracteristics 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. Similar to 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.

. I Ill. Program Description A. Sample Analysis This section describes the general analytical methodologies used by Teledyne Brown Engineering (TSE) to analyze the environmental samples for radioactivity for the Dresden Nuclear Power Station RGPP in 2022.

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 radio.logical 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, 1-131, 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 USEPA's 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 Dresden's 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 2022 in several sampling and testing locations (Table B-1.1, 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 8-1.1, Appendix B). Sr-89 was not detected in any of the samples. Sr-90 was detected in 1 sample at locations MW-DN-105S with a concentration of 1.6 +/- 0. 7 pCi/L.

Gross Alpha (dissolved and suspended)

Gross Alpha in the dissolved and suspended fractions analyses were not performed on groundwater samples in 2022 (Table 8-1.1, Appendix B).

Gamma Emitters Analyses for gamma-emitting nuclides were not performed in 2022.

(Table B-1.2, Appendix B).

Hard-Ta-Detects Hard-To-Detect analyses were performed on 8 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. Ni-63 was detected in 2 samples taken at MW-DN-101-1 and MW-DN-119-1 with concentrations of 9.4 pCi/L and 9.3 pCi/L respectively. All other hard-to-detect nuclides were not detected at concentrations greater than their respective MDCs.

(Table B-1.3, Appendix B).

B. Surface Water Results No surface water samples were collected in 2022.

C. Precipitation Water Results Precipitation Water Samples were collected from 8 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 8 locations were analyzed for tritium activity. Tritium was detected in 19 of 32 samples taken from 3 locations. The concentrations ranged from 182 to 1860 pCi/L. (Table B-I1.1, Appendix B)

D. Drinking Water Well Survey No drinking water well surveys were conducted in 2022.

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 2022.

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 2022.

I. Actions Taken

1. Compensatory Actions None.
2. Actions to Recover/Reverse Plumes None.

Intentionally left blank APPENDIX A LOCATION DESIGNATIONS

Intentionally left blank TABLEA-1 : Radiological Groundwater Protection Program - Sampling Locations, Dresden Nuclear Power Station, 2022 Site Site Type Location CBG Domestic Water 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 feel north of the Radwaste Tank Farm DSP-123 Monitoring Well Northeast comer of the Unit 1 Off-gas Building DSP-124 Monitoring Well 9 feet south of Floor Drain Collector Tank DSP-125 Monitoring Well Northeast comer 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 comer 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 DSP-159-S Monitoring Well 251 feet west of the Thorsen house; 450 ft south of the plant access gate ENC-5 ENC-14 FW-1 Precipitation 40 feet southwest of Unit 2/3 Off-gas Filter Building access door; north end of guardrail FW-2 Precipitation 15 feet south of the U 2/3 Intake Canal FW-3 Precipitation 100 feet north of the security fence, north part of switchyard FW-4 Precipitation 10 feet east of the U 2/3 Trackway, adjacent to the TB south wall FW-5 Precipitation 20 feet west of the concrete be on the north side of the gravel before it forks FW-10 Precipitation At the fence at the northwest comer 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 comer of the Admin Building; on the security fence MD-11 Piping located between Condensate Storage Tanks.

MW-DN-101-1 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 comer of the MUDS Building MW-DN-103-1 Monitoring Well 280 feet west of the northwest comer 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 comer of the Storeroom MW-DN-107-S Monitoring Well 15 feet west by southwest of the Unit 1 CST MW-DN-109-1 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 0,NWf) Building MW-DN-111-S Monitoring Well 9 feet east of the Floor Drain Collector Tank MW-DN-112-1 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 A-1

TABLEA-1 : Radiological Groundwater Protection Program - Sampling Locations, Dresden Nuclear Power Station, 2022 Site Site Type Location 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-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 offence around Unit 2/3 A CST and B CST (outside offence)

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 North Well RW-DN-100-S RW-DN-101-S TW-DN-128-S TW-DN -132-S TW-DN-133-S U1-1 U1 -12 Well Water A-2

APPENDIX B DATA TABLES

Intentionally left blank TABLE B-I.1 CONCENTRATIONS OF TRITIUM AND STRONTIUM IN GROUNDWATER SAMPLES COLLECTED IN THE VICINITY OF DRESDEN NUCLEAR POWER STATION, 2022 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION SITE DATE H-3 Sr-89 Sr-90 CBG 03/16/22 1160 +/- 191 CBG 06/07/22 400 +/- 130 CBG 07/26/22 517 +/- 133 CBG 11/15/22 756 +/- 155 DSP-106 03/15/22 1110 +/- 183 DSP-106 06/08/22 1090 +/- 174 < 3.8 < 0.8 DSP-106 07/26/22 1180 +/- 194 DSP-106 11/14/22 1080 +/- 187 DSP-107 03/15/22 1210 +/- 189 DSP-107 06/08/22 1580 +/- 225 < 5.0 < 0.7 DSP-107 07/26/22 1580 +/- 228 DSP-107 11/14/22 1360 +/- 215 DSP-108 03/15/22 278 +/- 118 DSP-108 06/08/22 332 +/- 125 < 3.7 < 0.8 DSP-108 07/27/22 200 +/- 119 DSP-108 11/16/22 < 195 DSP-122 03/17/22 851 +/- 153 DSP-122 06/09/22 736 +/- 150 < 3.7 < 0.7 DSP-122 07/27/22 568 +/- 130 DSP-122 11/15/22 1120 +/- 189 DSP-123 03/17/22 < 169 DSP-123 06/08/22 < 178 < 3.5 < 0.9 DSP-123 07/27/22 < 169 DSP-123 11/16/22 < 185 DSP-124 03/17/22 250 +/- 127 DSP-124 06/08/22 244 +/- 127 < 4.4 < 0.8 DSP-124 07/28/22 318 +/- 116 DSP-124 11/15/22 647 +/- 152 DSP-125 03/16/22 169 +/- 108 DSP-125 06/07/22 209 +/- 130 < 3.2 < 0.8 DSP-125 07/26/22 < 186 DSP-125 11/15/22 < 195 DSP-147 06/06/22 < 173 DSP-148 06/06/22 191 +/- 121 DSP-149 06/06/22 391 +/- 126 DSP-150 06/08/22 < 186 DSP-154 06/06/22 < 180 DSP-159-M 06/06/22 211 +/- 125 DSP-159-S 06/06/22 < 173 MD-11 03/16/22 10000 +/- 1050 MD-11 06/07/22 8450 +/- 900 < 7.5 < 0.8 MD-11 07/26/22 9390 +/- 992 MD-11 11/15/22 12000 +/- 1270 MW-DN-101-I 03/17/22 246 +/- 119 MW-DN-101-I 06/09/22 < 183 < 3.4 < 0.7 MW-DN-101-I 07/27/22 226 +/- 130 MW-DN-101-I 11/16/22 239 +/- 135 MW-DN-101-S 03/17/22 < 169 MW-DN-101-S 06/09/22 < 178 < 4.9 < 0.8 MW-DN-101-S 07/27/22 < 181 MW-DN-101-S 11/16/22 < 187 MW-DN-102-S 06/09/22 < 176 MW-DN-104-S 03/17/22 222 +/- 118 B-1

TABLE B-I.1 CONCENTRATIONS OF TRITIUM AND STRONTIUM IN GROUNDWATER SAMPLES COLLECTED IN THE VICINITY OF DRESDEN NUCLEAR POWER STATION, 2022 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION SITE DATE H-3 Sr-89 Sr-90 MW-DN-104-S 06109122 < 175 < 6.3 < 0.9 MW-DN-104-S 07127122 < 193 MW-DN-104-S 11/16/22 376 +/- 139 MW-DN-105-S 03115/22 < 182 MW-DN-105-S 06108/22 < 185 < 6.1 1.6 +/- 0.7 MW-DN-105-S 07/27/22 < 180 MW-DN-105-S 11/14/22 < 193 MW-DN-107-S 03/16/22 < 190 MW-DN-107-S 06/07/22 < 186 < 6.6 < 0.8 MW-DN-107-S 07/26/22 349 +/- 137 MW-DN-107-S 11/15/22 285 +/- 131 MW-DN-109-1 03/17/22 290 +/- 130 MW-DN-109-1 06/09/22 238 +/- 118 < 4.4 < 0.8 MW-DN-109-1 07/26/22 319 +/- 142 MW-DN-109-1 11/15/22 310 +/- 126 MW-DN-109-S 03/17/22 < 184 MW-DN-109-S 06/09/22 < 186 < 5.1 < 0.9 MW-DN-109-S 07/26/22 < 199 MW-DN-109-S 11/15/22 < 192 MW-DN-110-S 06/09/22 < 175 MW-DN-111-S 03/17/22 4250 +/- 490 MW-DN-111-S 06/08/22 3730 +/- 436 < 7.3 < 0.8 MW-DN-111-S 07/28/22 4510 +/- 519 MW-DN-111-S 11/15/22 6320 +/- 697 MW-DN-112-1 06/08/22 < 184 MW-DN-112-1 11/15/22 202 +/- 123 MW-DN-112-S 06/08/22 < 197 MW-DN-113-S 06/09/22 < 162 MW-DN-114-1 06/08/22 1460 +/- 213 MW-DN-114-1 11/15/22 1650 +/- 235 MW-DN-114-S 03/16/22 772 +/- 155 MW-DN-114-S 06/08/22 470 +/- 136 < 9.1 < 0.9 MW-DN-114-S 07/26/22 190 +/- 117 MW-DN-114-S 11/15/22 < 195 MW-DN-115-1 06/08/22 371 +/- 129 MW-DN-115-1 11/14/22 453 +/- 140 MW-DN-115-S 03/16/22 < 188 MW-DN-115-S 06/08/22 < 174 < 6.3 < 0.8 MW-DN-115-S 07/26/22 239 +/- 131 MW-DN-115-S 11/14/22 < 187 MW-DN-116-1 06/09/22 < 196 MW-DN-116-S 03/17/22 < 161 MW-DN-116-S 06/09/22 < 184 < 6.7 < 0.8 MW-DN-116-S 07/27/22 < 188 MW-DN-116-S 11/16/22 < 189 MW-DN-118-S 03/15/22 < 163 MW-DN-118-S 06/08/22 < 175 < 4.7 < 0.9 MW-DN-118-S 07/26/22 < 179 MW-DN-118-S 11/14/22 < 178 MW-DN-119-1 03/15/22 < 171 MW-DN-119-1 06/09/22 < 193 < 4.1 < 0.7 MW-DN-119-1 07/27/22 218 +/- 127 MW-DN-119-1 11/16/22 283 +/- 135 B-2

TABLE B-I.1 CONCENTRATIONS OF TRITIUM AND STRONTIUM IN GROUNDWATER SAMPLES COLLECTED IN THE VICINITY OF DRESDEN NUCLEAR POWER STATION, 2022 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION SITE DATE H-3 Sr-89 Sr-90 MW-DN-119-S 03/15/22 < 174 MW-DN-119-S 06/09/22 < 186 < 6.0 < 0.8 MW-DN-119-S 07/27/22 < 191 MW-DN-119-S 11/16/22 238 +/- 127 MW-DN-122-I 06/06/22 < 181 MW-DN-122-S 06/06/22 < 167 MW-DN-124-I 03/16/22 9680 +/- 1020 MW-DN-124-I 06/07/22 10900 +/- 1140 < 6.3 < 0.9 MW-DN-124-I 07/28/22 13300 +/- 1400 MW-DN-124-I 11/15/22 5480 +/- 609 MW-DN-124-S 03/16/22 398 +/- 131 MW-DN-124-S 06/07/22 418 +/- 130 < 3.6 < 0.9 MW-DN-124-S 07/28/22 947 +/- 174 MW-DN-124-S 11/15/22 665 +/- 146 MW-DN-125-S 06/07/22 < 177 MW-DN-125-S 11/15/22 < 192 MW-DN-126-S 03/16/22 < 176 MW-DN-126-S 06/07/22 249 +/- 118 < 6.7 < 0.8 MW-DN-126-S 07/28/22 < 194 MW-DN-126-S 11/15/22 303 +/- 126 MW-DN-127-S 06/07/22 361 +/- 124 MW-DN-134-S 06/06/22 < 173 MW-DN-135-S 06/06/22 < 171 MW-DN-136-S 03/15/22 < 187 MW-DN-136-S 06/06/22 < 172 < 6.1 < 0.9 MW-DN-136-S 07/25/22 < 198 MW-DN-136-S 11/16/22 < 181 MW-DN-137-S 06/06/22 < 185 MW-DN-140-S 03/17/22 < 184 MW-DN-140-S 06/09/22 < 190 < 8.6 < 0.9 MW-DN-140-S 07127122 < 186 MW-DN-140-S 11/16/22 < 177 MW-DN-141-S 03/17/22 1340 +/- 203 MW-DN-141-S 06/09/22 2100 +/- 281 < 8.0 < 0.9 MW-DN-141-S 07/27/22 2910 +/- 350 MW-DN-141-S 11/15/22 4430 +/- 504 MW-DN-142-S 06/06/22 < 182 MW-DN-143-S 06/06/22 < 185 MW-DN-144-S 06/06/22 < 196 RW-DN-100-S 03/16/22 368 +/- 126 RW-DN-100-S 06/07/22 < 188 < 7.7 < 0.8 RW-DN-100-S 07/28/22 1220 +/- 193 RW-DN-100-S 11/15/22 648 +/- 152 RW-DN-101-S 11/15/22 19400 +/- 2000 B-3

TABLE B-1.2 CONCENTRATIONS OF GAMMA EMITTERS IN GROUNDWATER SAMPLES COLLECTED IN THE VICINITY OF DRESDEN NUCLEAR POWER STATION, 2022 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA No samples collected or analyzed for gamma emitters in 2022 a,

I

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TABLE 8-1.3 CONCENTRATIONS OF HARD TO DETECTS IN GROUNDWATER SAMPLES COLLECTED IN THE VICINITY OF DRESDEN NUCLEAR POWER STATION, 2022 RESULTS IN UNITS OF PC!/LITER +/- 2 SIGMA COLLECTION SITE DATE Am-241 Cm-242 Cm-243/244 Pu-238 Pu-239/240 U-233/234 U-235 U-238 Fe-55 Ni-63 DSP-107 06/08/22 < 169 < 4.7 DSP-108 06/08/22 < 99 < 4.5 DSP-123 06/08/22 < 125 < 4.2 DSP-125 06/07/22 < 0.13 < 0.02 < 0.17 < 0.05 < 0.03 < 0.08 < 0.05 < 0.04 MD-11 06/07/22 < 0.15 < 0.06 < 0.06 < 0.18 < 0.18 < 0.14 < 0.18 < 0.08 < 142 < 3.8 MW-DN-101-I 06/09/22 < 65 9.4 +/- 2.8 MW-DN-101-S 06/09/22 < 141 < 4.5 MW-DN-105-S 06/08/22 < 45 < 3.4 MW-DN-116-S 06/09/22 < 169 < 3.4 MW-DN-119-1 06/09/22 < 107 9.3 +/- 2.2 MW-DN-119-S 06/09/22 < 111 < 4.0 MW-DN-124-I 06/07/22 < 0.02 < 0.04 < 0.07 < 0.06 < 0.06 < 0.05 < 0.06 < 0.05 < 155 < 4.7 MW-DN-124-S 06/07/22 < 0.17 < 0.15 < 0.19 < 0.04 < 0.04 < 0.09 < 0.11 < 0.09 ,< 94 < 4.3 CD en

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